ExprConstant.cpp revision 9ec7197796a2730d54ae7f632553b5311b2ba3b5
1b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner//===--- ExprConstant.cpp - Expression Constant Evaluator -----------------===// 2c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// 3c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// The LLVM Compiler Infrastructure 4c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// 5c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// This file is distributed under the University of Illinois Open Source 6c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// License. See LICENSE.TXT for details. 7c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// 8c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson//===----------------------------------------------------------------------===// 9c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// 10c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// This file implements the Expr constant evaluator. 11c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// 12745f5147e065900267c85a5568785a1991d4838fRichard Smith// Constant expression evaluation produces four main results: 13745f5147e065900267c85a5568785a1991d4838fRichard Smith// 14745f5147e065900267c85a5568785a1991d4838fRichard Smith// * A success/failure flag indicating whether constant folding was successful. 15745f5147e065900267c85a5568785a1991d4838fRichard Smith// This is the 'bool' return value used by most of the code in this file. A 16745f5147e065900267c85a5568785a1991d4838fRichard Smith// 'false' return value indicates that constant folding has failed, and any 17745f5147e065900267c85a5568785a1991d4838fRichard Smith// appropriate diagnostic has already been produced. 18745f5147e065900267c85a5568785a1991d4838fRichard Smith// 19745f5147e065900267c85a5568785a1991d4838fRichard Smith// * An evaluated result, valid only if constant folding has not failed. 20745f5147e065900267c85a5568785a1991d4838fRichard Smith// 21745f5147e065900267c85a5568785a1991d4838fRichard Smith// * A flag indicating if evaluation encountered (unevaluated) side-effects. 22745f5147e065900267c85a5568785a1991d4838fRichard Smith// These arise in cases such as (sideEffect(), 0) and (sideEffect() || 1), 23745f5147e065900267c85a5568785a1991d4838fRichard Smith// where it is possible to determine the evaluated result regardless. 24745f5147e065900267c85a5568785a1991d4838fRichard Smith// 25745f5147e065900267c85a5568785a1991d4838fRichard Smith// * A set of notes indicating why the evaluation was not a constant expression 26745f5147e065900267c85a5568785a1991d4838fRichard Smith// (under the C++11 rules only, at the moment), or, if folding failed too, 27745f5147e065900267c85a5568785a1991d4838fRichard Smith// why the expression could not be folded. 28745f5147e065900267c85a5568785a1991d4838fRichard Smith// 29745f5147e065900267c85a5568785a1991d4838fRichard Smith// If we are checking for a potential constant expression, failure to constant 30745f5147e065900267c85a5568785a1991d4838fRichard Smith// fold a potential constant sub-expression will be indicated by a 'false' 31745f5147e065900267c85a5568785a1991d4838fRichard Smith// return value (the expression could not be folded) and no diagnostic (the 32745f5147e065900267c85a5568785a1991d4838fRichard Smith// expression is not necessarily non-constant). 33745f5147e065900267c85a5568785a1991d4838fRichard Smith// 34c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson//===----------------------------------------------------------------------===// 35c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson 36c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson#include "clang/AST/APValue.h" 37c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson#include "clang/AST/ASTContext.h" 38199c3d6cd16aebbb9c7f0d42af9d922c9628bf70Ken Dyck#include "clang/AST/CharUnits.h" 3919cc4abea06a9b49e0e16a50d335c064cd723572Anders Carlsson#include "clang/AST/RecordLayout.h" 400fe52e1bcaa69ba127f1bda036f057fec1f478deSeo Sanghyeon#include "clang/AST/StmtVisitor.h" 418ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor#include "clang/AST/TypeLoc.h" 42500d3297d2a21edeac4d46cbcbe21bc2352c2a28Chris Lattner#include "clang/AST/ASTDiagnostic.h" 438ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor#include "clang/AST/Expr.h" 441b63e4f732dbc73d90abf886b4d21f8e3a165f6dChris Lattner#include "clang/Basic/Builtins.h" 4500bd44d5677783527d7517c1ffe45e4d75a0f56fBenjamin Kramer#include "clang/Basic/PartialDiagnostic.h" 4606a3675627e3b3c47b49c689c8e404a33144194aAnders Carlsson#include "clang/Basic/TargetInfo.h" 477462b39a9bccaf4392687831036713f09f9c0681Mike Stump#include "llvm/ADT/SmallString.h" 484572baba9d18c275968ac113fd73b0e3c77cccb8Mike Stump#include <cstring> 497b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith#include <functional> 504572baba9d18c275968ac113fd73b0e3c77cccb8Mike Stump 51c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlssonusing namespace clang; 52f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnerusing llvm::APSInt; 53d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanusing llvm::APFloat; 54c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson 5587eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// EvalInfo - This is a private struct used by the evaluator to capture 5687eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// information about a subexpression as it is folded. It retains information 5787eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// about the AST context, but also maintains information about the folded 5887eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// expression. 5987eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// 6087eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// If an expression could be evaluated, it is still possible it is not a C 6187eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// "integer constant expression" or constant expression. If not, this struct 6287eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// captures information about how and why not. 6387eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// 6487eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// One bit of information passed *into* the request for constant folding 6587eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// indicates whether the subexpression is "evaluated" or not according to C 6687eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// rules. For example, the RHS of (0 && foo()) is not evaluated. We can 6787eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// evaluate the expression regardless of what the RHS is, but C only allows 6887eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// certain things in certain situations. 69c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramernamespace { 70180f47959a066795cc0f409433023af448bb0328Richard Smith struct LValue; 71d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith struct CallStackFrame; 72bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith struct EvalInfo; 73d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 741bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType getType(APValue::LValueBase B) { 751bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!B) return QualType(); 761bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) 771bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return D->getType(); 781bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return B.get<const Expr*>()->getType(); 791bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith } 801bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith 81180f47959a066795cc0f409433023af448bb0328Richard Smith /// Get an LValue path entry, which is known to not be an array index, as a 82f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith /// field or base class. 83f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith APValue::BaseOrMemberType getAsBaseOrMember(APValue::LValuePathEntry E) { 84180f47959a066795cc0f409433023af448bb0328Richard Smith APValue::BaseOrMemberType Value; 85180f47959a066795cc0f409433023af448bb0328Richard Smith Value.setFromOpaqueValue(E.BaseOrMember); 86f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return Value; 87f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 88f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 89f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith /// Get an LValue path entry, which is known to not be an array index, as a 90f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith /// field declaration. 91f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const FieldDecl *getAsField(APValue::LValuePathEntry E) { 92f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return dyn_cast<FieldDecl>(getAsBaseOrMember(E).getPointer()); 93180f47959a066795cc0f409433023af448bb0328Richard Smith } 94180f47959a066795cc0f409433023af448bb0328Richard Smith /// Get an LValue path entry, which is known to not be an array index, as a 95180f47959a066795cc0f409433023af448bb0328Richard Smith /// base class declaration. 96180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *getAsBaseClass(APValue::LValuePathEntry E) { 97f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return dyn_cast<CXXRecordDecl>(getAsBaseOrMember(E).getPointer()); 98180f47959a066795cc0f409433023af448bb0328Richard Smith } 99180f47959a066795cc0f409433023af448bb0328Richard Smith /// Determine whether this LValue path entry for a base class names a virtual 100180f47959a066795cc0f409433023af448bb0328Richard Smith /// base class. 101180f47959a066795cc0f409433023af448bb0328Richard Smith bool isVirtualBaseClass(APValue::LValuePathEntry E) { 102f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return getAsBaseOrMember(E).getInt(); 103180f47959a066795cc0f409433023af448bb0328Richard Smith } 104180f47959a066795cc0f409433023af448bb0328Richard Smith 105b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Find the path length and type of the most-derived subobject in the given 106b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// path, and find the size of the containing array, if any. 107b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith static 108b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned findMostDerivedSubobject(ASTContext &Ctx, QualType Base, 109b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArrayRef<APValue::LValuePathEntry> Path, 110b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith uint64_t &ArraySize, QualType &Type) { 111b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned MostDerivedLength = 0; 112b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Type = Base; 1139a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith for (unsigned I = 0, N = Path.size(); I != N; ++I) { 114b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Type->isArrayType()) { 115b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const ConstantArrayType *CAT = 116b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith cast<ConstantArrayType>(Ctx.getAsArrayType(Type)); 117b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Type = CAT->getElementType(); 118b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArraySize = CAT->getSize().getZExtValue(); 119b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedLength = I + 1; 120b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } else if (const FieldDecl *FD = getAsField(Path[I])) { 121b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Type = FD->getType(); 122b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArraySize = 0; 123b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedLength = I + 1; 124b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } else { 1259a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith // Path[I] describes a base class. 126b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArraySize = 0; 127b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1289a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 129b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return MostDerivedLength; 1309a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 1319a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 132b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // The order of this enum is important for diagnostics. 133b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith enum CheckSubobjectKind { 134b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith CSK_Base, CSK_Derived, CSK_Field, CSK_ArrayToPointer, CSK_ArrayIndex, 135b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith CSK_This 136b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith }; 137b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1380a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// A path from a glvalue to a subobject of that glvalue. 1390a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith struct SubobjectDesignator { 1400a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// True if the subobject was named in a manner not supported by C++11. Such 1410a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// lvalues can still be folded, but they are not core constant expressions 1420a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// and we cannot perform lvalue-to-rvalue conversions on them. 1430a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith bool Invalid : 1; 1440a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 145b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Is this a pointer one past the end of an object? 146b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool IsOnePastTheEnd : 1; 147b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 148b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// The length of the path to the most-derived object of which this is a 149b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// subobject. 150b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned MostDerivedPathLength : 30; 151b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 152b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// The size of the array of which the most-derived object is an element, or 153b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// 0 if the most-derived object is not an array element. 154b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith uint64_t MostDerivedArraySize; 1550a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 156b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// The type of the most derived object referred to by this address. 157b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith QualType MostDerivedType; 1580a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 1599a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith typedef APValue::LValuePathEntry PathEntry; 1609a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 1610a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// The entries on the path from the glvalue to the designated subobject. 1620a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SmallVector<PathEntry, 8> Entries; 1630a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 164b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator() : Invalid(true) {} 1650a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 166b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith explicit SubobjectDesignator(QualType T) 167b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith : Invalid(false), IsOnePastTheEnd(false), MostDerivedPathLength(0), 168b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedArraySize(0), MostDerivedType(T) {} 169b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 170b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator(ASTContext &Ctx, const APValue &V) 171b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith : Invalid(!V.isLValue() || !V.hasLValuePath()), IsOnePastTheEnd(false), 172b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength(0), MostDerivedArraySize(0) { 1739a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (!Invalid) { 174b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith IsOnePastTheEnd = V.isLValueOnePastTheEnd(); 1759a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith ArrayRef<PathEntry> VEntries = V.getLValuePath(); 1769a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith Entries.insert(Entries.end(), VEntries.begin(), VEntries.end()); 1779a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (V.getLValueBase()) 178b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength = 179b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith findMostDerivedSubobject(Ctx, getType(V.getLValueBase()), 180b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith V.getLValuePath(), MostDerivedArraySize, 181b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedType); 1829a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 1839a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 1849a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 1850a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith void setInvalid() { 1860a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Invalid = true; 1870a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Entries.clear(); 1880a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 189b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 190b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Determine whether this is a one-past-the-end pointer. 191b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool isOnePastTheEnd() const { 192b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (IsOnePastTheEnd) 193b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 194b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedArraySize && 195b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Entries[MostDerivedPathLength - 1].ArrayIndex == MostDerivedArraySize) 196b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 197b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 198b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 199b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 200b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Check that this refers to a valid subobject. 201b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool isValidSubobject() const { 202b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Invalid) 203b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 204b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return !isOnePastTheEnd(); 205b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 206b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Check that this refers to a valid subobject, and if not, produce a 207b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// relevant diagnostic and set the designator as invalid. 208b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkSubobject(EvalInfo &Info, const Expr *E, CheckSubobjectKind CSK); 209b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 210b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Update this designator to refer to the first element within this array. 211b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addArrayUnchecked(const ConstantArrayType *CAT) { 2120a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith PathEntry Entry; 213b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Entry.ArrayIndex = 0; 2140a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Entries.push_back(Entry); 215b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 216b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // This is a most-derived object. 217b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedType = CAT->getElementType(); 218b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedArraySize = CAT->getSize().getZExtValue(); 219b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength = Entries.size(); 2200a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 2210a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// Update this designator to refer to the given base or member of this 2220a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// object. 223b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addDeclUnchecked(const Decl *D, bool Virtual = false) { 2240a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith PathEntry Entry; 225180f47959a066795cc0f409433023af448bb0328Richard Smith APValue::BaseOrMemberType Value(D, Virtual); 226180f47959a066795cc0f409433023af448bb0328Richard Smith Entry.BaseOrMember = Value.getOpaqueValue(); 2270a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Entries.push_back(Entry); 228b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 229b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // If this isn't a base class, it's a new most-derived object. 230b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 231b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedType = FD->getType(); 232b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedArraySize = 0; 233b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength = Entries.size(); 234b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2350a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 236b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void diagnosePointerArithmetic(EvalInfo &Info, const Expr *E, uint64_t N); 2370a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// Add N to the address of this subobject. 238b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void adjustIndex(EvalInfo &Info, const Expr *E, uint64_t N) { 2390a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (Invalid) return; 240b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedPathLength == Entries.size() && MostDerivedArraySize) { 2419a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith Entries.back().ArrayIndex += N; 242b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Entries.back().ArrayIndex > MostDerivedArraySize) { 243b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith diagnosePointerArithmetic(Info, E, Entries.back().ArrayIndex); 244b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 245b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2460a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return; 2470a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 248b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // [expr.add]p4: For the purposes of these operators, a pointer to a 249b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // nonarray object behaves the same as a pointer to the first element of 250b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // an array of length one with the type of the object as its element type. 251b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (IsOnePastTheEnd && N == (uint64_t)-1) 252b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith IsOnePastTheEnd = false; 253b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else if (!IsOnePastTheEnd && N == 1) 254b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith IsOnePastTheEnd = true; 255b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else if (N != 0) { 256b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith diagnosePointerArithmetic(Info, E, uint64_t(IsOnePastTheEnd) + N); 2570a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith setInvalid(); 258b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2590a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 2600a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith }; 2610a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 26247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith /// A core constant value. This can be the value of any constant expression, 26347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith /// or a pointer or reference to a non-static object or function parameter. 264e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// 265e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// For an LValue, the base and offset are stored in the APValue subobject, 266e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// but the other information is stored in the SubobjectDesignator. For all 267e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// other value kinds, the value is stored directly in the APValue subobject. 26847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith class CCValue : public APValue { 26947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith typedef llvm::APSInt APSInt; 27047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith typedef llvm::APFloat APFloat; 271177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith /// If the value is a reference or pointer into a parameter or temporary, 272177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith /// this is the corresponding call stack frame. 273177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith CallStackFrame *CallFrame; 2740a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// If the value is a reference or pointer, this is a description of how the 2750a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// subobject was specified. 2760a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator Designator; 27747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith public: 278177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith struct GlobalValue {}; 279177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith 28047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue() {} 28147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith explicit CCValue(const APSInt &I) : APValue(I) {} 28247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith explicit CCValue(const APFloat &F) : APValue(F) {} 28347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue(const APValue *E, unsigned N) : APValue(E, N) {} 28447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue(const APSInt &R, const APSInt &I) : APValue(R, I) {} 28547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue(const APFloat &R, const APFloat &I) : APValue(R, I) {} 286177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith CCValue(const CCValue &V) : APValue(V), CallFrame(V.CallFrame) {} 2871bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith CCValue(LValueBase B, const CharUnits &O, CallStackFrame *F, 2880a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &D) : 2899a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith APValue(B, O, APValue::NoLValuePath()), CallFrame(F), Designator(D) {} 290b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CCValue(ASTContext &Ctx, const APValue &V, GlobalValue) : 291b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith APValue(V), CallFrame(0), Designator(Ctx, V) {} 292e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith CCValue(const ValueDecl *D, bool IsDerivedMember, 293e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ArrayRef<const CXXRecordDecl*> Path) : 294e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith APValue(D, IsDerivedMember, Path) {} 29565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman CCValue(const AddrLabelExpr* LHSExpr, const AddrLabelExpr* RHSExpr) : 29665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman APValue(LHSExpr, RHSExpr) {} 29747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith 298177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith CallStackFrame *getLValueFrame() const { 29947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith assert(getKind() == LValue); 300177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return CallFrame; 30147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith } 3020a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator &getLValueDesignator() { 3030a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith assert(getKind() == LValue); 3040a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return Designator; 3050a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 3060a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &getLValueDesignator() const { 3070a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return const_cast<CCValue*>(this)->getLValueDesignator(); 3080a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 30947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith }; 31047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith 311bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// A stack frame in the constexpr call stack. 312bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith struct CallStackFrame { 313bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith EvalInfo &Info; 314bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 315bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// Parent - The caller of this stack frame. 316bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame *Caller; 317bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 31808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// CallLoc - The location of the call expression for this call. 31908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SourceLocation CallLoc; 32008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 32108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// Callee - The function which was called. 32208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee; 32308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 324180f47959a066795cc0f409433023af448bb0328Richard Smith /// This - The binding for the this pointer in this call, if any. 325180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue *This; 326180f47959a066795cc0f409433023af448bb0328Richard Smith 327bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// ParmBindings - Parameter bindings for this function call, indexed by 328bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// parameters' function scope indices. 329bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith const CCValue *Arguments; 330bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 331bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith typedef llvm::DenseMap<const Expr*, CCValue> MapTy; 332bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith typedef MapTy::const_iterator temp_iterator; 333bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// Temporaries - Temporary lvalues materialized within this stack frame. 334bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith MapTy Temporaries; 335bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 33608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, 33708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee, const LValue *This, 338180f47959a066795cc0f409433023af448bb0328Richard Smith const CCValue *Arguments); 339bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith ~CallStackFrame(); 340bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith }; 341bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 342dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// A partial diagnostic which we might know in advance that we are not going 343dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// to emit. 344dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith class OptionalDiagnostic { 345dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith PartialDiagnostic *Diag; 346dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 347dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith public: 348dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith explicit OptionalDiagnostic(PartialDiagnostic *Diag = 0) : Diag(Diag) {} 349dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 350dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith template<typename T> 351dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith OptionalDiagnostic &operator<<(const T &v) { 352dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (Diag) 353dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith *Diag << v; 354dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return *this; 355dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 356789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 357789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith OptionalDiagnostic &operator<<(const APSInt &I) { 358789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Diag) { 359789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith llvm::SmallVector<char, 32> Buffer; 360789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith I.toString(Buffer); 361789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith *Diag << StringRef(Buffer.data(), Buffer.size()); 362789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 363789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return *this; 364789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 365789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 366789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith OptionalDiagnostic &operator<<(const APFloat &F) { 367789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Diag) { 368789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith llvm::SmallVector<char, 32> Buffer; 369789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith F.toString(Buffer); 370789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith *Diag << StringRef(Buffer.data(), Buffer.size()); 371789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 372789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return *this; 373789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 374dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith }; 375dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 376c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer struct EvalInfo { 377dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith ASTContext &Ctx; 3781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3791e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith /// EvalStatus - Contains information about the evaluation. 3801e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith Expr::EvalStatus &EvalStatus; 381f0c1e4b679e15c26bffb5892e35985bf3c52f77aAnders Carlsson 382d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// CurrentCall - The top of the constexpr call stack. 383bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame *CurrentCall; 384d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 385d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// CallStackDepth - The number of calls in the call stack right now. 386d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith unsigned CallStackDepth; 387d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 38847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith typedef llvm::DenseMap<const OpaqueValueExpr*, CCValue> MapTy; 389bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// OpaqueValues - Values used as the common expression in a 390bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// BinaryConditionalOperator. 391c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer MapTy OpaqueValues; 392bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 393bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// BottomFrame - The frame in which evaluation started. This must be 394745f5147e065900267c85a5568785a1991d4838fRichard Smith /// initialized after CurrentCall and CallStackDepth. 395bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame BottomFrame; 396bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 397180f47959a066795cc0f409433023af448bb0328Richard Smith /// EvaluatingDecl - This is the declaration whose initializer is being 398180f47959a066795cc0f409433023af448bb0328Richard Smith /// evaluated, if any. 399180f47959a066795cc0f409433023af448bb0328Richard Smith const VarDecl *EvaluatingDecl; 400180f47959a066795cc0f409433023af448bb0328Richard Smith 401180f47959a066795cc0f409433023af448bb0328Richard Smith /// EvaluatingDeclValue - This is the value being constructed for the 402180f47959a066795cc0f409433023af448bb0328Richard Smith /// declaration whose initializer is being evaluated, if any. 403180f47959a066795cc0f409433023af448bb0328Richard Smith APValue *EvaluatingDeclValue; 404180f47959a066795cc0f409433023af448bb0328Richard Smith 405c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// HasActiveDiagnostic - Was the previous diagnostic stored? If so, further 406c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// notes attached to it will also be stored, otherwise they will not be. 407c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith bool HasActiveDiagnostic; 408c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 409745f5147e065900267c85a5568785a1991d4838fRichard Smith /// CheckingPotentialConstantExpression - Are we checking whether the 410745f5147e065900267c85a5568785a1991d4838fRichard Smith /// expression is a potential constant expression? If so, some diagnostics 411745f5147e065900267c85a5568785a1991d4838fRichard Smith /// are suppressed. 412745f5147e065900267c85a5568785a1991d4838fRichard Smith bool CheckingPotentialConstantExpression; 413745f5147e065900267c85a5568785a1991d4838fRichard Smith 414bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 415bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith EvalInfo(const ASTContext &C, Expr::EvalStatus &S) 416dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith : Ctx(const_cast<ASTContext&>(C)), EvalStatus(S), CurrentCall(0), 41708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackDepth(0), BottomFrame(*this, SourceLocation(), 0, 0, 0), 418745f5147e065900267c85a5568785a1991d4838fRichard Smith EvaluatingDecl(0), EvaluatingDeclValue(0), HasActiveDiagnostic(false), 419745f5147e065900267c85a5568785a1991d4838fRichard Smith CheckingPotentialConstantExpression(false) {} 420bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 42147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith const CCValue *getOpaqueValue(const OpaqueValueExpr *e) const { 422c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer MapTy::const_iterator i = OpaqueValues.find(e); 423c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer if (i == OpaqueValues.end()) return 0; 424c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer return &i->second; 425c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer } 42656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 427180f47959a066795cc0f409433023af448bb0328Richard Smith void setEvaluatingDecl(const VarDecl *VD, APValue &Value) { 428180f47959a066795cc0f409433023af448bb0328Richard Smith EvaluatingDecl = VD; 429180f47959a066795cc0f409433023af448bb0328Richard Smith EvaluatingDeclValue = &Value; 430180f47959a066795cc0f409433023af448bb0328Richard Smith } 431180f47959a066795cc0f409433023af448bb0328Richard Smith 432c18c42345636e2866fed75c7e434fb659d747672Richard Smith const LangOptions &getLangOpts() const { return Ctx.getLangOptions(); } 433c18c42345636e2866fed75c7e434fb659d747672Richard Smith 434c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith bool CheckCallLimit(SourceLocation Loc) { 435745f5147e065900267c85a5568785a1991d4838fRichard Smith // Don't perform any constexpr calls (other than the call we're checking) 436745f5147e065900267c85a5568785a1991d4838fRichard Smith // when checking a potential constant expression. 437745f5147e065900267c85a5568785a1991d4838fRichard Smith if (CheckingPotentialConstantExpression && CallStackDepth > 1) 438745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 439c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (CallStackDepth <= getLangOpts().ConstexprCallDepth) 440c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 441c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Diag(Loc, diag::note_constexpr_depth_limit_exceeded) 442c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << getLangOpts().ConstexprCallDepth; 443c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 444c18c42345636e2866fed75c7e434fb659d747672Richard Smith } 445f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 446c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith private: 447c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Add a diagnostic to the diagnostics list. 448c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith PartialDiagnostic &addDiag(SourceLocation Loc, diag::kind DiagId) { 449c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith PartialDiagnostic PD(DiagId, Ctx.getDiagAllocator()); 450c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith EvalStatus.Diag->push_back(std::make_pair(Loc, PD)); 451c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return EvalStatus.Diag->back().second; 452c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 453c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 45408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// Add notes containing a call stack to the current point of evaluation. 45508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith void addCallStack(unsigned Limit); 45608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 457c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith public: 458f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// Diagnose that the evaluation cannot be folded. 4597098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith OptionalDiagnostic Diag(SourceLocation Loc, diag::kind DiagId 4607098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith = diag::note_invalid_subexpr_in_const_expr, 461c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned ExtraNotes = 0) { 462f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // If we have a prior diagnostic, it will be noting that the expression 463f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // isn't a constant expression. This diagnostic is more important. 464f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: We might want to show both diagnostics to the user. 465dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (EvalStatus.Diag) { 46608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned CallStackNotes = CallStackDepth - 1; 46708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned Limit = Ctx.getDiagnostics().getConstexprBacktraceLimit(); 46808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (Limit) 46908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackNotes = std::min(CallStackNotes, Limit + 1); 470745f5147e065900267c85a5568785a1991d4838fRichard Smith if (CheckingPotentialConstantExpression) 471745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackNotes = 0; 47208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 473c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HasActiveDiagnostic = true; 474dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith EvalStatus.Diag->clear(); 47508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith EvalStatus.Diag->reserve(1 + ExtraNotes + CallStackNotes); 47608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Loc, DiagId); 477745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!CheckingPotentialConstantExpression) 478745f5147e065900267c85a5568785a1991d4838fRichard Smith addCallStack(Limit); 47908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith return OptionalDiagnostic(&(*EvalStatus.Diag)[0].second); 480dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 481c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HasActiveDiagnostic = false; 482dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return OptionalDiagnostic(); 483dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 484dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 485dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// Diagnose that the evaluation does not produce a C++11 core constant 486dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// expression. 4877098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith OptionalDiagnostic CCEDiag(SourceLocation Loc, diag::kind DiagId 4887098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith = diag::note_invalid_subexpr_in_const_expr, 489c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned ExtraNotes = 0) { 490dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith // Don't override a previous diagnostic. 491dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (!EvalStatus.Diag || !EvalStatus.Diag->empty()) 492dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return OptionalDiagnostic(); 493c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return Diag(Loc, DiagId, ExtraNotes); 494c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 495c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 496c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Add a note to a prior diagnostic. 497c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith OptionalDiagnostic Note(SourceLocation Loc, diag::kind DiagId) { 498c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!HasActiveDiagnostic) 499c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return OptionalDiagnostic(); 500c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return OptionalDiagnostic(&addDiag(Loc, DiagId)); 501f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 502099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 503099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith /// Add a stack of notes to a prior diagnostic. 504099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith void addNotes(ArrayRef<PartialDiagnosticAt> Diags) { 505099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (HasActiveDiagnostic) { 506099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EvalStatus.Diag->insert(EvalStatus.Diag->end(), 507099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Diags.begin(), Diags.end()); 508099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 509099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 510745f5147e065900267c85a5568785a1991d4838fRichard Smith 511745f5147e065900267c85a5568785a1991d4838fRichard Smith /// Should we continue evaluation as much as possible after encountering a 512745f5147e065900267c85a5568785a1991d4838fRichard Smith /// construct which can't be folded? 513745f5147e065900267c85a5568785a1991d4838fRichard Smith bool keepEvaluatingAfterFailure() { 514745f5147e065900267c85a5568785a1991d4838fRichard Smith return CheckingPotentialConstantExpression && EvalStatus.Diag->empty(); 515745f5147e065900267c85a5568785a1991d4838fRichard Smith } 516c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer }; 517f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 518f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith /// Object used to treat all foldable expressions as constant expressions. 519f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith struct FoldConstant { 520f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool Enabled; 521f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 522f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith explicit FoldConstant(EvalInfo &Info) 523f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith : Enabled(Info.EvalStatus.Diag && Info.EvalStatus.Diag->empty() && 524f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !Info.EvalStatus.HasSideEffects) { 525f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 526f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Treat the value we've computed since this object was created as constant. 527f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith void Fold(EvalInfo &Info) { 528f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (Enabled && !Info.EvalStatus.Diag->empty() && 529f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !Info.EvalStatus.HasSideEffects) 530f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Info.EvalStatus.Diag->clear(); 531f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 532f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith }; 53308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 53408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 535b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithbool SubobjectDesignator::checkSubobject(EvalInfo &Info, const Expr *E, 536b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CheckSubobjectKind CSK) { 537b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Invalid) 538b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 539b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (isOnePastTheEnd()) { 540b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_past_end_subobject) 541b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << CSK; 542b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 543b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 544b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 545b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 546b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith} 547b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 548b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithvoid SubobjectDesignator::diagnosePointerArithmetic(EvalInfo &Info, 549b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const Expr *E, uint64_t N) { 550b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedPathLength == Entries.size() && MostDerivedArraySize) 551b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_array_index) 552b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<int>(N) << /*array*/ 0 553b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<unsigned>(MostDerivedArraySize); 554b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 555b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_array_index) 556b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<int>(N) << /*non-array*/ 1; 557b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 558b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith} 559b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 56008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard SmithCallStackFrame::CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, 56108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee, const LValue *This, 56208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const CCValue *Arguments) 56308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith : Info(Info), Caller(Info.CurrentCall), CallLoc(CallLoc), Callee(Callee), 56408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith This(This), Arguments(Arguments) { 56508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Info.CurrentCall = this; 56608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith ++Info.CallStackDepth; 56708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 56808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 56908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard SmithCallStackFrame::~CallStackFrame() { 57008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith assert(Info.CurrentCall == this && "calls retired out of order"); 57108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith --Info.CallStackDepth; 57208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Info.CurrentCall = Caller; 57308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 57487eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner 57508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith/// Produce a string describing the given constexpr call. 57608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithstatic void describeCall(CallStackFrame *Frame, llvm::raw_ostream &Out) { 57708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned ArgIndex = 0; 57808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith bool IsMemberCall = isa<CXXMethodDecl>(Frame->Callee) && 5795ba73e1af8ef519161bd40063dc325457e21676aRichard Smith !isa<CXXConstructorDecl>(Frame->Callee) && 5805ba73e1af8ef519161bd40063dc325457e21676aRichard Smith cast<CXXMethodDecl>(Frame->Callee)->isInstance(); 58108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 58208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (!IsMemberCall) 58308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << *Frame->Callee << '('; 58408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 58508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith for (FunctionDecl::param_const_iterator I = Frame->Callee->param_begin(), 58608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith E = Frame->Callee->param_end(); I != E; ++I, ++ArgIndex) { 5875fe31228c883040cf016cfc71ad4bfeba462602eNAKAMURA Takumi if (ArgIndex > (unsigned)IsMemberCall) 58808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << ", "; 58908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 59008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const ParmVarDecl *Param = *I; 59108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const CCValue &Arg = Frame->Arguments[ArgIndex]; 59208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (!Arg.isLValue() || Arg.getLValueDesignator().Invalid) 59308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Arg.printPretty(Out, Frame->Info.Ctx, Param->getType()); 59408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith else { 59508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Deliberately slice off the frame to form an APValue we can print. 59608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith APValue Value(Arg.getLValueBase(), Arg.getLValueOffset(), 59708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Arg.getLValueDesignator().Entries, 598b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Arg.getLValueDesignator().IsOnePastTheEnd); 59908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Value.printPretty(Out, Frame->Info.Ctx, Param->getType()); 60008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 60108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 60208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (ArgIndex == 0 && IsMemberCall) 60308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << "->" << *Frame->Callee << '('; 604bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith } 605d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 60608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << ')'; 60708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 60808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 60908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithvoid EvalInfo::addCallStack(unsigned Limit) { 61008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Determine which calls to skip, if any. 61108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned ActiveCalls = CallStackDepth - 1; 61208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned SkipStart = ActiveCalls, SkipEnd = SkipStart; 61308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (Limit && Limit < ActiveCalls) { 61408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SkipStart = Limit / 2 + Limit % 2; 61508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SkipEnd = ActiveCalls - Limit / 2; 61608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 61708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 61808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Walk the call stack and add the diagnostics. 61908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned CallIdx = 0; 62008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith for (CallStackFrame *Frame = CurrentCall; Frame != &BottomFrame; 62108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Frame = Frame->Caller, ++CallIdx) { 62208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Skip this call? 62308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (CallIdx >= SkipStart && CallIdx < SkipEnd) { 62408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (CallIdx == SkipStart) { 62508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Note that we're skipping calls. 62608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Frame->CallLoc, diag::note_constexpr_calls_suppressed) 62708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith << unsigned(ActiveCalls - Limit); 62808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 62908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith continue; 63008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 63108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 63208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith llvm::SmallVector<char, 128> Buffer; 63308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith llvm::raw_svector_ostream Out(Buffer); 63408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith describeCall(Frame, Out); 63508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Frame->CallLoc, diag::note_constexpr_call_here) << Out.str(); 636bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith } 63708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 638d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 63908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithnamespace { 640f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall struct ComplexValue { 641f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall private: 642f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool IsInt; 643f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 644f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall public: 645f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt IntReal, IntImag; 646f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat FloatReal, FloatImag; 647f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 648f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue() : FloatReal(APFloat::Bogus), FloatImag(APFloat::Bogus) {} 649f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 650f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall void makeComplexFloat() { IsInt = false; } 651f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool isComplexFloat() const { return !IsInt; } 652f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat &getComplexFloatReal() { return FloatReal; } 653f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat &getComplexFloatImag() { return FloatImag; } 654f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 655f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall void makeComplexInt() { IsInt = true; } 656f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool isComplexInt() const { return IsInt; } 657f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt &getComplexIntReal() { return IntReal; } 658f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt &getComplexIntImag() { return IntImag; } 659f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 66047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith void moveInto(CCValue &v) const { 661f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall if (isComplexFloat()) 66247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith v = CCValue(FloatReal, FloatImag); 663f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall else 66447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith v = CCValue(IntReal, IntImag); 665f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall } 66647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith void setFrom(const CCValue &v) { 66756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall assert(v.isComplexFloat() || v.isComplexInt()); 66856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (v.isComplexFloat()) { 66956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall makeComplexFloat(); 67056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall FloatReal = v.getComplexFloatReal(); 67156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall FloatImag = v.getComplexFloatImag(); 67256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } else { 67356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall makeComplexInt(); 67456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall IntReal = v.getComplexIntReal(); 67556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall IntImag = v.getComplexIntImag(); 67656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 67756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 678f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall }; 679efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 680efdb83e26f9a1fd2566afe54461216cd84814d42John McCall struct LValue { 6811bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith APValue::LValueBase Base; 682efdb83e26f9a1fd2566afe54461216cd84814d42John McCall CharUnits Offset; 683177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith CallStackFrame *Frame; 6840a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator Designator; 685efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 6861bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const APValue::LValueBase getLValueBase() const { return Base; } 68747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CharUnits &getLValueOffset() { return Offset; } 688625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const CharUnits &getLValueOffset() const { return Offset; } 689177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith CallStackFrame *getLValueFrame() const { return Frame; } 6900a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator &getLValueDesignator() { return Designator; } 6910a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &getLValueDesignator() const { return Designator;} 692efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 69347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith void moveInto(CCValue &V) const { 6940a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith V = CCValue(Base, Offset, Frame, Designator); 695efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } 69647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith void setFrom(const CCValue &V) { 69747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith assert(V.isLValue()); 69847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Base = V.getLValueBase(); 69947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Offset = V.getLValueOffset(); 700177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith Frame = V.getLValueFrame(); 7010a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Designator = V.getLValueDesignator(); 7020a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 7030a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 7041bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith void set(APValue::LValueBase B, CallStackFrame *F = 0) { 7051bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Base = B; 7060a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Offset = CharUnits::Zero(); 7070a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Frame = F; 708b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator = SubobjectDesignator(getType(B)); 709b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 710b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 711b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check that this LValue is not based on a null pointer. If it is, produce 712b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // a diagnostic and mark the designator as invalid. 713b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkNullPointer(EvalInfo &Info, const Expr *E, 714b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CheckSubobjectKind CSK) { 715b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.Invalid) 716b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 717b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Base) { 718b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_null_subobject) 719b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << CSK; 720b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.setInvalid(); 721b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 722b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 723b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 724b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 725b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 726b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check this LValue refers to an object. If not, set the designator to be 727b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // invalid and emit a diagnostic. 728b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkSubobject(EvalInfo &Info, const Expr *E, CheckSubobjectKind CSK) { 729b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return checkNullPointer(Info, E, CSK) && 730b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.checkSubobject(Info, E, CSK); 731b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 732b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 733b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addDecl(EvalInfo &Info, const Expr *E, 734b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const Decl *D, bool Virtual = false) { 735b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith checkSubobject(Info, E, isa<FieldDecl>(D) ? CSK_Field : CSK_Base); 736b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addDeclUnchecked(D, Virtual); 737b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 738b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addArray(EvalInfo &Info, const Expr *E, const ConstantArrayType *CAT) { 739b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith checkSubobject(Info, E, CSK_ArrayToPointer); 740b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addArrayUnchecked(CAT); 741b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 742b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void adjustIndex(EvalInfo &Info, const Expr *E, uint64_t N) { 743b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!checkNullPointer(Info, E, CSK_ArrayIndex)) 744b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return; 745b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.adjustIndex(Info, E, N); 74656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 747efdb83e26f9a1fd2566afe54461216cd84814d42John McCall }; 748e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 749e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith struct MemberPtr { 750e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr() {} 751e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith explicit MemberPtr(const ValueDecl *Decl) : 752e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember(Decl, false), Path() {} 753e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 754e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// The member or (direct or indirect) field referred to by this member 755e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// pointer, or 0 if this is a null member pointer. 756e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ValueDecl *getDecl() const { 757e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DeclAndIsDerivedMember.getPointer(); 758e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 759e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Is this actually a member of some type derived from the relevant class? 760e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool isDerivedMember() const { 761e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DeclAndIsDerivedMember.getInt(); 762e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 763e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Get the class which the declaration actually lives in. 764e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *getContainingRecord() const { 765e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return cast<CXXRecordDecl>( 766e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.getPointer()->getDeclContext()); 767e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 768e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 769e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith void moveInto(CCValue &V) const { 770e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith V = CCValue(getDecl(), isDerivedMember(), Path); 771e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 772e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith void setFrom(const CCValue &V) { 773e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(V.isMemberPointer()); 774e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setPointer(V.getMemberPointerDecl()); 775e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(V.isMemberPointerToDerivedMember()); 776e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.clear(); 777e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ArrayRef<const CXXRecordDecl*> P = V.getMemberPointerPath(); 778e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.insert(Path.end(), P.begin(), P.end()); 779e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 780e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 781e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// DeclAndIsDerivedMember - The member declaration, and a flag indicating 782e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// whether the member is a member of some class derived from the class type 783e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// of the member pointer. 784e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith llvm::PointerIntPair<const ValueDecl*, 1, bool> DeclAndIsDerivedMember; 785e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Path - The path of base/derived classes from the member declaration's 786e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// class (exclusive) to the class type of the member pointer (inclusive). 787e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith SmallVector<const CXXRecordDecl*, 4> Path; 788e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 789e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a cast towards the class of the Decl (either up or down the 790e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// hierarchy). 791e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castBack(const CXXRecordDecl *Class) { 792e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!Path.empty()); 793e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Expected; 794e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.size() >= 2) 795e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Expected = Path[Path.size() - 2]; 796e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith else 797e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Expected = getContainingRecord(); 798e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Expected->getCanonicalDecl() != Class->getCanonicalDecl()) { 799e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.static.cast]p12: In a conversion from (D::*) to (B::*), 800e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // if B does not contain the original member and is not a base or 801e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // derived class of the class containing the original member, the result 802e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // of the cast is undefined. 803e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [conv.mem]p2 does not cover this case for a cast from (B::*) to 804e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // (D::*). We consider that to be a language defect. 805e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 806e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 807e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.pop_back(); 808e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 809e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 810e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a base-to-derived member pointer cast. 811e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castToDerived(const CXXRecordDecl *Derived) { 812e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!getDecl()) 813e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 814e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!isDerivedMember()) { 815e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.push_back(Derived); 816e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 817e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 818e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!castBack(Derived)) 819e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 820e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.empty()) 821e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(false); 822e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 823e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 824e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a derived-to-base member pointer cast. 825e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castToBase(const CXXRecordDecl *Base) { 826e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!getDecl()) 827e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 828e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.empty()) 829e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(true); 830e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isDerivedMember()) { 831e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.push_back(Base); 832e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 833e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 834e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return castBack(Base); 835e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 836e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith }; 837c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 838b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith /// Compare two member pointers, which are assumed to be of the same type. 839b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith static bool operator==(const MemberPtr &LHS, const MemberPtr &RHS) { 840b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHS.getDecl() || !RHS.getDecl()) 841b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return !LHS.getDecl() && !RHS.getDecl(); 842b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (LHS.getDecl()->getCanonicalDecl() != RHS.getDecl()->getCanonicalDecl()) 843b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 844b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return LHS.Path == RHS.Path; 845b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 846b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 847c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Kinds of constant expression checking, for diagnostics. 848c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith enum CheckConstantExpressionKind { 849c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_Constant, ///< A normal constant. 850c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_ReturnValue, ///< A constexpr function return value. 851c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_MemberInit ///< A constexpr constructor mem-initializer. 852c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith }; 853f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall} 85487eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner 85547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smithstatic bool Evaluate(CCValue &Result, EvalInfo &Info, const Expr *E); 85669c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smithstatic bool EvaluateConstantExpression(APValue &Result, EvalInfo &Info, 857c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const LValue &This, const Expr *E, 858c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CheckConstantExpressionKind CCEK 859c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith = CCEK_Constant); 860efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluateLValue(const Expr *E, LValue &Result, EvalInfo &Info); 861efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluatePointer(const Expr *E, LValue &Result, EvalInfo &Info); 862e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, 863e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith EvalInfo &Info); 864e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info); 86587eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattnerstatic bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info); 86647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smithstatic bool EvaluateIntegerOrLValue(const Expr *E, CCValue &Result, 867d9becd1846e2c72bf6ad283faa1b048f33dd3afeChris Lattner EvalInfo &Info); 868d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanstatic bool EvaluateFloat(const Expr *E, APFloat &Result, EvalInfo &Info); 869f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCallstatic bool EvaluateComplex(const Expr *E, ComplexValue &Res, EvalInfo &Info); 870f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 871f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 8724efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman// Misc utilities 8734efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 8744efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 875180f47959a066795cc0f409433023af448bb0328Richard Smith/// Should this call expression be treated as a string literal? 876180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool IsStringLiteralCall(const CallExpr *E) { 877180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned Builtin = E->isBuiltinCall(); 878180f47959a066795cc0f409433023af448bb0328Richard Smith return (Builtin == Builtin::BI__builtin___CFStringMakeConstantString || 879180f47959a066795cc0f409433023af448bb0328Richard Smith Builtin == Builtin::BI__builtin___NSStringMakeConstantString); 880180f47959a066795cc0f409433023af448bb0328Richard Smith} 881180f47959a066795cc0f409433023af448bb0328Richard Smith 8821bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smithstatic bool IsGlobalLValue(APValue::LValueBase B) { 883180f47959a066795cc0f409433023af448bb0328Richard Smith // C++11 [expr.const]p3 An address constant expression is a prvalue core 884180f47959a066795cc0f409433023af448bb0328Richard Smith // constant expression of pointer type that evaluates to... 885180f47959a066795cc0f409433023af448bb0328Richard Smith 886180f47959a066795cc0f409433023af448bb0328Richard Smith // ... a null pointer value, or a prvalue core constant expression of type 887180f47959a066795cc0f409433023af448bb0328Richard Smith // std::nullptr_t. 8881bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!B) return true; 88942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 8901bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { 891180f47959a066795cc0f409433023af448bb0328Richard Smith // ... the address of an object with static storage duration, 8921bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 89342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return VD->hasGlobalStorage(); 8941bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith // ... the address of a function, 8951bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return isa<FunctionDecl>(D); 89642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall } 8971bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith 8981bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const Expr *E = B.get<const Expr*>(); 8991bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith switch (E->getStmtClass()) { 9001bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith default: 9011bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return false; 902180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::CompoundLiteralExprClass: 903180f47959a066795cc0f409433023af448bb0328Richard Smith return cast<CompoundLiteralExpr>(E)->isFileScope(); 904180f47959a066795cc0f409433023af448bb0328Richard Smith // A string literal has static storage duration. 905180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::StringLiteralClass: 906180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::PredefinedExprClass: 907180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::ObjCStringLiteralClass: 908180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::ObjCEncodeExprClass: 90947d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith case Expr::CXXTypeidExprClass: 910180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 911180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::CallExprClass: 912180f47959a066795cc0f409433023af448bb0328Richard Smith return IsStringLiteralCall(cast<CallExpr>(E)); 913180f47959a066795cc0f409433023af448bb0328Richard Smith // For GCC compatibility, &&label has static storage duration. 914180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::AddrLabelExprClass: 915180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 916180f47959a066795cc0f409433023af448bb0328Richard Smith // A Block literal expression may be used as the initialization value for 917180f47959a066795cc0f409433023af448bb0328Richard Smith // Block variables at global or local static scope. 918180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::BlockExprClass: 919180f47959a066795cc0f409433023af448bb0328Richard Smith return !cast<BlockExpr>(E)->getBlockDecl()->hasCaptures(); 920745f5147e065900267c85a5568785a1991d4838fRichard Smith case Expr::ImplicitValueInitExprClass: 921745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: 922745f5147e065900267c85a5568785a1991d4838fRichard Smith // We can never form an lvalue with an implicit value initialization as its 923745f5147e065900267c85a5568785a1991d4838fRichard Smith // base through expression evaluation, so these only appear in one case: the 924745f5147e065900267c85a5568785a1991d4838fRichard Smith // implicit variable declaration we invent when checking whether a constexpr 925745f5147e065900267c85a5568785a1991d4838fRichard Smith // constructor can produce a constant expression. We must assume that such 926745f5147e065900267c85a5568785a1991d4838fRichard Smith // an expression might be a global lvalue. 927745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 928180f47959a066795cc0f409433023af448bb0328Richard Smith } 92942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 93042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 9319a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// Check that this reference or pointer core constant expression is a valid 932b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// value for an address or reference constant expression. Type T should be 93361e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith/// either LValue or CCValue. Return true if we can fold this expression, 93461e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith/// whether or not it's a constant expression. 9359a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smithtemplate<typename T> 936f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool CheckLValueConstantExpression(EvalInfo &Info, const Expr *E, 937c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const T &LVal, APValue &Value, 938c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CheckConstantExpressionKind CCEK) { 939c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APValue::LValueBase Base = LVal.getLValueBase(); 940c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const SubobjectDesignator &Designator = LVal.getLValueDesignator(); 941c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 942c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!IsGlobalLValue(Base)) { 943c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 944c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 945c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_non_global, 1) 946c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << E->isGLValue() << !Designator.Entries.empty() 947c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << !!VD << CCEK << VD; 948c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (VD) 949c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 950c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith else 951c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Note(Base.dyn_cast<const Expr*>()->getExprLoc(), 952c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith diag::note_constexpr_temporary_here); 953c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else { 9547098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc()); 955c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 95661e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith // Don't allow references to temporaries to escape. 95769c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return false; 958f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 95969c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 960b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool IsReferenceType = E->isGLValue(); 961b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 962b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.Invalid) { 96361e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith // This is not a core constant expression. An appropriate diagnostic will 96461e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith // have already been produced. 9659a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith Value = APValue(LVal.getLValueBase(), LVal.getLValueOffset(), 9669a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith APValue::NoLValuePath()); 9679a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith return true; 9689a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 9699a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 970b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Value = APValue(LVal.getLValueBase(), LVal.getLValueOffset(), 971b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.Entries, Designator.IsOnePastTheEnd); 972b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 973b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Allow address constant expressions to be past-the-end pointers. This is 974b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // an extension: the standard requires them to point to an object. 975b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!IsReferenceType) 976b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 977b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 978b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A reference constant expression must refer to an object. 979b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Base) { 980b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // FIXME: diagnostic 981b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc()); 98261e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith return true; 983b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 984b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 985c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith // Does this refer one past the end of some object? 986b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.isOnePastTheEnd()) { 987c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 988c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_past_end, 1) 989c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << !Designator.Entries.empty() << !!VD << VD; 990c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (VD) 991c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 992c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith else 993c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Note(Base.dyn_cast<const Expr*>()->getExprLoc(), 994c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith diag::note_constexpr_temporary_here); 995c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 996c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 99769c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return true; 99847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith} 99947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith 100051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// Check that this core constant expression is of literal type, and if not, 100151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// produce an appropriate diagnostic. 100251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smithstatic bool CheckLiteralType(EvalInfo &Info, const Expr *E) { 100351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!E->isRValue() || E->getType()->isLiteralType()) 100451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 100551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 100651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Prvalue constant expressions must be of literal types. 100751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (Info.getLangOpts().CPlusPlus0x) 100851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_nonliteral) 100951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith << E->getType(); 101051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith else 101151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 101251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 101351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 101451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 10159a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// Check that this core constant expression value is a valid value for a 10169a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// constant expression, and if it is, produce the corresponding constant value. 101751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// If not, report an appropriate diagnostic. Does not check that the expression 101851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// is of literal type. 1019f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool CheckConstantExpression(EvalInfo &Info, const Expr *E, 1020c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const CCValue &CCValue, APValue &Value, 1021c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CheckConstantExpressionKind CCEK 1022c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith = CCEK_Constant) { 10239a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (!CCValue.isLValue()) { 10249a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith Value = CCValue; 10259a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith return true; 10269a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 1027c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return CheckLValueConstantExpression(Info, E, CCValue, Value, CCEK); 10289a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith} 10299a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 10309e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smithconst ValueDecl *GetLValueBaseDecl(const LValue &LVal) { 10311bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return LVal.Base.dyn_cast<const ValueDecl*>(); 10329e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith} 10339e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith 10349e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smithstatic bool IsLiteralLValue(const LValue &Value) { 10351bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Value.Base.dyn_cast<const Expr*>() && !Value.Frame; 10369e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith} 10379e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith 103865ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smithstatic bool IsWeakLValue(const LValue &Value) { 103965ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith const ValueDecl *Decl = GetLValueBaseDecl(Value); 10400dd7a25e8d679de1dc0ce788222d6dee0e879885Lang Hames return Decl && Decl->isWeak(); 104165ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith} 104265ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith 1043e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvalPointerValueAsBool(const CCValue &Value, bool &Result) { 10443554283157190e67918fad4221a5e6faf9317362John McCall // A null base expression indicates a null pointer. These are always 10453554283157190e67918fad4221a5e6faf9317362John McCall // evaluatable, and they are false unless the offset is zero. 1046e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Value.getLValueBase()) { 1047e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = !Value.getLValueOffset().isZero(); 10483554283157190e67918fad4221a5e6faf9317362John McCall return true; 10493554283157190e67918fad4221a5e6faf9317362John McCall } 10503554283157190e67918fad4221a5e6faf9317362John McCall 1051e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // We have a non-null base. These are generally known to be true, but if it's 1052e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // a weak declaration it can be null at runtime. 10533554283157190e67918fad4221a5e6faf9317362John McCall Result = true; 1054e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ValueDecl *Decl = Value.getLValueBase().dyn_cast<const ValueDecl*>(); 10550dd7a25e8d679de1dc0ce788222d6dee0e879885Lang Hames return !Decl || !Decl->isWeak(); 10565bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman} 10575bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman 105847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smithstatic bool HandleConversionToBool(const CCValue &Val, bool &Result) { 1059c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith switch (Val.getKind()) { 1060c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Uninitialized: 1061c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1062c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Int: 1063c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = Val.getInt().getBoolValue(); 106441bf4f38348561a0f12c10d34f1673cd19a6eb04Richard Smith return true; 1065c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Float: 1066c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = !Val.getFloat().isZero(); 1067a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman return true; 1068c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::ComplexInt: 1069c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = Val.getComplexIntReal().getBoolValue() || 1070c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Val.getComplexIntImag().getBoolValue(); 1071c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return true; 1072c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::ComplexFloat: 1073c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = !Val.getComplexFloatReal().isZero() || 1074c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith !Val.getComplexFloatImag().isZero(); 1075436c8898cd1c93c5bacd3fcc4ac586bc5cd77062Richard Smith return true; 1076e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case APValue::LValue: 1077e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvalPointerValueAsBool(Val, Result); 1078e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case APValue::MemberPointer: 1079e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = Val.getMemberPointerDecl(); 1080e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 1081c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Vector: 1082cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith case APValue::Array: 1083180f47959a066795cc0f409433023af448bb0328Richard Smith case APValue::Struct: 1084180f47959a066795cc0f409433023af448bb0328Richard Smith case APValue::Union: 108565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman case APValue::AddrLabelDiff: 1086c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 10874efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 10884efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 1089c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith llvm_unreachable("unknown APValue kind"); 1090c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 1091c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1092c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithstatic bool EvaluateAsBooleanCondition(const Expr *E, bool &Result, 1093c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalInfo &Info) { 1094c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && "missing lvalue-to-rvalue conv in bool condition"); 109547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue Val; 1096c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!Evaluate(Val, Info, E)) 1097c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1098c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return HandleConversionToBool(Val, Result); 10994efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 11004efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 1101c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithtemplate<typename T> 1102c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleOverflow(EvalInfo &Info, const Expr *E, 1103c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const T &SrcValue, QualType DestType) { 1104c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_overflow) 1105789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith << SrcValue << DestType; 1106c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 1107c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith} 1108c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 1109c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleFloatToIntCast(EvalInfo &Info, const Expr *E, 1110c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, const APFloat &Value, 1111c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType DestType, APSInt &Result) { 1112c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned DestWidth = Info.Ctx.getIntWidth(DestType); 1113a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // Determine whether we are converting to unsigned or signed. 1114575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor bool DestSigned = DestType->isSignedIntegerOrEnumerationType(); 11151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1116c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result = APSInt(DestWidth, !DestSigned); 1117a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar bool ignored; 1118c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Value.convertToInteger(Result, llvm::APFloat::rmTowardZero, &ignored) 1119c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opInvalidOp) 1120c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1121c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1122a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1123a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1124c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleFloatToFloatCast(EvalInfo &Info, const Expr *E, 1125c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, QualType DestType, 1126c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat &Result) { 1127c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat Value = Result; 1128a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar bool ignored; 1129c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Result.convert(Info.Ctx.getFloatTypeSemantics(DestType), 1130c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat::rmNearestTiesToEven, &ignored) 1131c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opOverflow) 1132c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1133c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1134a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1135a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1136f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smithstatic APSInt HandleIntToIntCast(EvalInfo &Info, const Expr *E, 1137f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith QualType DestType, QualType SrcType, 1138f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith APSInt &Value) { 1139f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith unsigned DestWidth = Info.Ctx.getIntWidth(DestType); 1140a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar APSInt Result = Value; 1141a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // Figure out if this is a truncate, extend or noop cast. 1142a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // If the input is signed, do a sign extend, noop, or truncate. 11439f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Result = Result.extOrTrunc(DestWidth); 1144575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor Result.setIsUnsigned(DestType->isUnsignedIntegerOrEnumerationType()); 1145a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar return Result; 1146a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1147a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1148c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleIntToFloatCast(EvalInfo &Info, const Expr *E, 1149c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, const APSInt &Value, 1150c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType DestType, APFloat &Result) { 1151c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result = APFloat(Info.Ctx.getFloatTypeSemantics(DestType), 1); 1152c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Result.convertFromAPInt(Value, Value.isSigned(), 1153c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat::rmNearestTiesToEven) 1154c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opOverflow) 1155c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1156c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1157a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1158a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1159e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedmanstatic bool EvalAndBitcastToAPInt(EvalInfo &Info, const Expr *E, 1160e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt &Res) { 1161e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman CCValue SVal; 1162e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (!Evaluate(SVal, Info, E)) 1163e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1164e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isInt()) { 1165e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = SVal.getInt(); 1166e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1167e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1168e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isFloat()) { 1169e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = SVal.getFloat().bitcastToAPInt(); 1170e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1171e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1172e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isVector()) { 1173e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType VecTy = E->getType(); 1174e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned VecSize = Info.Ctx.getTypeSize(VecTy); 1175e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType EltTy = VecTy->castAs<VectorType>()->getElementType(); 1176e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned EltSize = Info.Ctx.getTypeSize(EltTy); 1177e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); 1178e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = llvm::APInt::getNullValue(VecSize); 1179e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < SVal.getVectorLength(); i++) { 1180e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman APValue &Elt = SVal.getVectorElt(i); 1181e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt EltAsInt; 1182e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (Elt.isInt()) { 1183e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman EltAsInt = Elt.getInt(); 1184e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else if (Elt.isFloat()) { 1185e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman EltAsInt = Elt.getFloat().bitcastToAPInt(); 1186e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else { 1187e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Don't try to handle vectors of anything other than int or float 1188e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // (not sure if it's possible to hit this case). 1189e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1190e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1191e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1192e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned BaseEltSize = EltAsInt.getBitWidth(); 1193e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 1194e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res |= EltAsInt.zextOrTrunc(VecSize).rotr(i*EltSize+BaseEltSize); 1195e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 1196e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res |= EltAsInt.zextOrTrunc(VecSize).rotl(i*EltSize); 1197e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1198e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1199e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1200e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Give up if the input isn't an int, float, or vector. For example, we 1201e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // reject "(v4i16)(intptr_t)&a". 1202e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1203e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1204e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman} 1205e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman 1206b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// Cast an lvalue referring to a base subobject to a derived class, by 1207b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// truncating the lvalue's path to the given length. 1208b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool CastToDerivedClass(EvalInfo &Info, const Expr *E, LValue &Result, 1209b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const RecordDecl *TruncatedType, 1210b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned TruncatedElements) { 1211b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator &D = Result.Designator; 1212180f47959a066795cc0f409433023af448bb0328Richard Smith 1213b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check we actually point to a derived class object. 1214b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (TruncatedElements == D.Entries.size()) 1215b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 1216b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith assert(TruncatedElements >= D.MostDerivedPathLength && 1217b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith "not casting to a derived class"); 1218b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Result.checkSubobject(Info, E, CSK_Derived)) 1219180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1220180f47959a066795cc0f409433023af448bb0328Richard Smith 1221b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Truncate the path to the subobject, and remove any derived-to-base offsets. 1222e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const RecordDecl *RD = TruncatedType; 1223e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = TruncatedElements, N = D.Entries.size(); I != N; ++I) { 1224180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 1225180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Base = getAsBaseClass(D.Entries[I]); 1226e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isVirtualBaseClass(D.Entries[I])) 1227180f47959a066795cc0f409433023af448bb0328Richard Smith Result.Offset -= Layout.getVBaseClassOffset(Base); 1228e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith else 1229180f47959a066795cc0f409433023af448bb0328Richard Smith Result.Offset -= Layout.getBaseClassOffset(Base); 1230180f47959a066795cc0f409433023af448bb0328Richard Smith RD = Base; 1231180f47959a066795cc0f409433023af448bb0328Richard Smith } 1232e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith D.Entries.resize(TruncatedElements); 1233180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1234180f47959a066795cc0f409433023af448bb0328Richard Smith} 1235180f47959a066795cc0f409433023af448bb0328Richard Smith 1236b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic void HandleLValueDirectBase(EvalInfo &Info, const Expr *E, LValue &Obj, 1237180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Derived, 1238180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Base, 1239180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout *RL = 0) { 1240180f47959a066795cc0f409433023af448bb0328Richard Smith if (!RL) RL = &Info.Ctx.getASTRecordLayout(Derived); 1241180f47959a066795cc0f409433023af448bb0328Richard Smith Obj.getLValueOffset() += RL->getBaseClassOffset(Base); 1242b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj.addDecl(Info, E, Base, /*Virtual*/ false); 1243180f47959a066795cc0f409433023af448bb0328Richard Smith} 1244180f47959a066795cc0f409433023af448bb0328Richard Smith 1245b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleLValueBase(EvalInfo &Info, const Expr *E, LValue &Obj, 1246180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *DerivedDecl, 1247180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXBaseSpecifier *Base) { 1248180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *BaseDecl = Base->getType()->getAsCXXRecordDecl(); 1249180f47959a066795cc0f409433023af448bb0328Richard Smith 1250180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Base->isVirtual()) { 1251b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, E, Obj, DerivedDecl, BaseDecl); 1252180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1253180f47959a066795cc0f409433023af448bb0328Richard Smith } 1254180f47959a066795cc0f409433023af448bb0328Richard Smith 1255b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator &D = Obj.Designator; 1256b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.Invalid) 1257b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1258b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1259180f47959a066795cc0f409433023af448bb0328Richard Smith // Extract most-derived object and corresponding type. 1260b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith DerivedDecl = D.MostDerivedType->getAsCXXRecordDecl(); 1261b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!CastToDerivedClass(Info, E, Obj, DerivedDecl, D.MostDerivedPathLength)) 1262180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1263180f47959a066795cc0f409433023af448bb0328Richard Smith 1264b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Find the virtual base class. 1265180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(DerivedDecl); 1266180f47959a066795cc0f409433023af448bb0328Richard Smith Obj.getLValueOffset() += Layout.getVBaseClassOffset(BaseDecl); 1267b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj.addDecl(Info, E, BaseDecl, /*Virtual*/ true); 1268180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1269180f47959a066795cc0f409433023af448bb0328Richard Smith} 1270180f47959a066795cc0f409433023af448bb0328Richard Smith 1271180f47959a066795cc0f409433023af448bb0328Richard Smith/// Update LVal to refer to the given field, which must be a member of the type 1272180f47959a066795cc0f409433023af448bb0328Richard Smith/// currently described by LVal. 1273b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic void HandleLValueMember(EvalInfo &Info, const Expr *E, LValue &LVal, 1274180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *FD, 1275180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout *RL = 0) { 1276180f47959a066795cc0f409433023af448bb0328Richard Smith if (!RL) 1277180f47959a066795cc0f409433023af448bb0328Richard Smith RL = &Info.Ctx.getASTRecordLayout(FD->getParent()); 1278180f47959a066795cc0f409433023af448bb0328Richard Smith 1279180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned I = FD->getFieldIndex(); 1280180f47959a066795cc0f409433023af448bb0328Richard Smith LVal.Offset += Info.Ctx.toCharUnitsFromBits(RL->getFieldOffset(I)); 1281b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LVal.addDecl(Info, E, FD); 1282180f47959a066795cc0f409433023af448bb0328Richard Smith} 1283180f47959a066795cc0f409433023af448bb0328Richard Smith 1284d9b02e726262e4009dda830998bb934172ac0020Richard Smith/// Update LVal to refer to the given indirect field. 1285d9b02e726262e4009dda830998bb934172ac0020Richard Smithstatic void HandleLValueIndirectMember(EvalInfo &Info, const Expr *E, 1286d9b02e726262e4009dda830998bb934172ac0020Richard Smith LValue &LVal, 1287d9b02e726262e4009dda830998bb934172ac0020Richard Smith const IndirectFieldDecl *IFD) { 1288d9b02e726262e4009dda830998bb934172ac0020Richard Smith for (IndirectFieldDecl::chain_iterator C = IFD->chain_begin(), 1289d9b02e726262e4009dda830998bb934172ac0020Richard Smith CE = IFD->chain_end(); C != CE; ++C) 1290d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueMember(Info, E, LVal, cast<FieldDecl>(*C)); 1291d9b02e726262e4009dda830998bb934172ac0020Richard Smith} 1292d9b02e726262e4009dda830998bb934172ac0020Richard Smith 1293180f47959a066795cc0f409433023af448bb0328Richard Smith/// Get the size of the given type in char units. 1294180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool HandleSizeof(EvalInfo &Info, QualType Type, CharUnits &Size) { 1295180f47959a066795cc0f409433023af448bb0328Richard Smith // sizeof(void), __alignof__(void), sizeof(function) = 1 as a gcc 1296180f47959a066795cc0f409433023af448bb0328Richard Smith // extension. 1297180f47959a066795cc0f409433023af448bb0328Richard Smith if (Type->isVoidType() || Type->isFunctionType()) { 1298180f47959a066795cc0f409433023af448bb0328Richard Smith Size = CharUnits::One(); 1299180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1300180f47959a066795cc0f409433023af448bb0328Richard Smith } 1301180f47959a066795cc0f409433023af448bb0328Richard Smith 1302180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Type->isConstantSizeType()) { 1303180f47959a066795cc0f409433023af448bb0328Richard Smith // sizeof(vla) is not a constantexpr: C99 6.5.3.4p2. 1304b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // FIXME: Diagnostic. 1305180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1306180f47959a066795cc0f409433023af448bb0328Richard Smith } 1307180f47959a066795cc0f409433023af448bb0328Richard Smith 1308180f47959a066795cc0f409433023af448bb0328Richard Smith Size = Info.Ctx.getTypeSizeInChars(Type); 1309180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1310180f47959a066795cc0f409433023af448bb0328Richard Smith} 1311180f47959a066795cc0f409433023af448bb0328Richard Smith 1312180f47959a066795cc0f409433023af448bb0328Richard Smith/// Update a pointer value to model pointer arithmetic. 1313180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Info - Information about the ongoing evaluation. 1314b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// \param E - The expression being evaluated, for diagnostic purposes. 1315180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param LVal - The pointer value to be updated. 1316180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param EltTy - The pointee type represented by LVal. 1317180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Adjustment - The adjustment, in objects of type EltTy, to add. 1318b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleLValueArrayAdjustment(EvalInfo &Info, const Expr *E, 1319b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LValue &LVal, QualType EltTy, 1320b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith int64_t Adjustment) { 1321180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits SizeOfPointee; 1322180f47959a066795cc0f409433023af448bb0328Richard Smith if (!HandleSizeof(Info, EltTy, SizeOfPointee)) 1323180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1324180f47959a066795cc0f409433023af448bb0328Richard Smith 1325180f47959a066795cc0f409433023af448bb0328Richard Smith // Compute the new offset in the appropriate width. 1326180f47959a066795cc0f409433023af448bb0328Richard Smith LVal.Offset += Adjustment * SizeOfPointee; 1327b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LVal.adjustIndex(Info, E, Adjustment); 1328180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1329180f47959a066795cc0f409433023af448bb0328Richard Smith} 1330180f47959a066795cc0f409433023af448bb0328Richard Smith 133103f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith/// Try to evaluate the initializer for a variable declaration. 1332f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateVarDeclInit(EvalInfo &Info, const Expr *E, 1333f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const VarDecl *VD, 1334177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith CallStackFrame *Frame, CCValue &Result) { 1335d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // If this is a parameter to an active constexpr function call, perform 1336d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // argument substitution. 1337d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (const ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(VD)) { 1338745f5147e065900267c85a5568785a1991d4838fRichard Smith // Assume arguments of a potential constant expression are unknown 1339745f5147e065900267c85a5568785a1991d4838fRichard Smith // constant expressions. 1340745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression) 1341745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1342f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Frame || !Frame->Arguments) { 1343dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1344177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return false; 1345f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1346177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith Result = Frame->Arguments[PVD->getFunctionScopeIndex()]; 1347177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return true; 1348d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 134903f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1350099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Dig out the initializer, and use the declaration which it's attached to. 1351099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const Expr *Init = VD->getAnyInitializer(VD); 1352099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (!Init || Init->isValueDependent()) { 1353745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking a potential constant expression, the variable could be 1354745f5147e065900267c85a5568785a1991d4838fRichard Smith // initialized later. 1355745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckingPotentialConstantExpression) 1356745f5147e065900267c85a5568785a1991d4838fRichard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1357099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return false; 1358099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 1359099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 1360180f47959a066795cc0f409433023af448bb0328Richard Smith // If we're currently evaluating the initializer of this declaration, use that 1361180f47959a066795cc0f409433023af448bb0328Richard Smith // in-flight value. 1362180f47959a066795cc0f409433023af448bb0328Richard Smith if (Info.EvaluatingDecl == VD) { 1363b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result = CCValue(Info.Ctx, *Info.EvaluatingDeclValue, 1364b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CCValue::GlobalValue()); 1365180f47959a066795cc0f409433023af448bb0328Richard Smith return !Result.isUninit(); 1366180f47959a066795cc0f409433023af448bb0328Richard Smith } 1367180f47959a066795cc0f409433023af448bb0328Richard Smith 136865ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith // Never evaluate the initializer of a weak variable. We can't be sure that 136965ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith // this is the definition which will be used. 1370f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (VD->isWeak()) { 1371dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 137265ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith return false; 1373f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 137465ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith 1375099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Check that we can fold the initializer. In C++, we will have already done 1376099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // this in the cases where it matters for conformance. 1377099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 1378099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (!VD->evaluateValue(Notes)) { 1379099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_var_init_non_constant, 1380099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Notes.size() + 1) << VD; 1381099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 1382099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.addNotes(Notes); 138347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return false; 1384099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } else if (!VD->checkInitIsICE()) { 1385099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_var_init_non_constant, 1386099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Notes.size() + 1) << VD; 1387099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 1388099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.addNotes(Notes); 1389f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 139003f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1391b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result = CCValue(Info.Ctx, *VD->getEvaluatedValue(), CCValue::GlobalValue()); 139247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return true; 139303f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith} 139403f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1395c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithstatic bool IsConstNonVolatile(QualType T) { 139603f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith Qualifiers Quals = T.getQualifiers(); 139703f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith return Quals.hasConst() && !Quals.hasVolatile(); 139803f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith} 139903f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 140059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// Get the base index of the given base class within an APValue representing 140159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// the given derived class. 140259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic unsigned getBaseIndex(const CXXRecordDecl *Derived, 140359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base) { 140459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Base = Base->getCanonicalDecl(); 140559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith unsigned Index = 0; 140659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith for (CXXRecordDecl::base_class_const_iterator I = Derived->bases_begin(), 140759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith E = Derived->bases_end(); I != E; ++I, ++Index) { 140859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (I->getType()->getAsCXXRecordDecl()->getCanonicalDecl() == Base) 140959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return Index; 141059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 141159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 141259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith llvm_unreachable("base class missing from derived class's bases list"); 141359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 141459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1415cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith/// Extract the designated sub-object of an rvalue. 1416f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool ExtractSubobject(EvalInfo &Info, const Expr *E, 1417f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith CCValue &Obj, QualType ObjType, 1418cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const SubobjectDesignator &Sub, QualType SubType) { 1419b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Sub.Invalid) 1420b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A diagnostic will have already been produced. 1421cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1422b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Sub.isOnePastTheEnd()) { 14237098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), Info.getLangOpts().CPlusPlus0x ? 1424aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_constexpr_read_past_end : 1425aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_invalid_subexpr_in_const_expr); 14267098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 14277098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 1428f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smith if (Sub.Entries.empty()) 1429cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 1430745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression && Obj.isUninit()) 1431745f5147e065900267c85a5568785a1991d4838fRichard Smith // This object might be initialized later. 1432745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1433cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 1434cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith assert(!Obj.isLValue() && "extracting subobject of lvalue"); 1435cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const APValue *O = &Obj; 1436180f47959a066795cc0f409433023af448bb0328Richard Smith // Walk the designator's path to find the subobject. 1437cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith for (unsigned I = 0, N = Sub.Entries.size(); I != N; ++I) { 1438cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (ObjType->isArrayType()) { 1439180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is an array element. 1440cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(ObjType); 1441f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith assert(CAT && "vla in literal type?"); 1442cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith uint64_t Index = Sub.Entries[I].ArrayIndex; 1443f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (CAT->getSize().ule(Index)) { 14447098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Note, it should not be possible to form a pointer with a valid 14457098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // designator which points more than one past the end of the array. 14467098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), Info.getLangOpts().CPlusPlus0x ? 1447aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_constexpr_read_past_end : 1448aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_invalid_subexpr_in_const_expr); 1449cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1450f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1451cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (O->getArrayInitializedElts() > Index) 1452cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith O = &O->getArrayInitializedElt(Index); 1453cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith else 1454cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith O = &O->getArrayFiller(); 1455cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith ObjType = CAT->getElementType(); 1456180f47959a066795cc0f409433023af448bb0328Richard Smith } else if (const FieldDecl *Field = getAsField(Sub.Entries[I])) { 1457180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is a class, struct or union field. 1458180f47959a066795cc0f409433023af448bb0328Richard Smith RecordDecl *RD = ObjType->castAs<RecordType>()->getDecl(); 1459180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 1460180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *UnionField = O->getUnionField(); 1461180f47959a066795cc0f409433023af448bb0328Richard Smith if (!UnionField || 1462f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith UnionField->getCanonicalDecl() != Field->getCanonicalDecl()) { 14637098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), 14647098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith diag::note_constexpr_read_inactive_union_member) 14657098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith << Field << !UnionField << UnionField; 1466180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1467f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1468180f47959a066795cc0f409433023af448bb0328Richard Smith O = &O->getUnionValue(); 1469180f47959a066795cc0f409433023af448bb0328Richard Smith } else 1470180f47959a066795cc0f409433023af448bb0328Richard Smith O = &O->getStructField(Field->getFieldIndex()); 1471180f47959a066795cc0f409433023af448bb0328Richard Smith ObjType = Field->getType(); 14727098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 14737098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (ObjType.isVolatileQualified()) { 14747098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 14757098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // FIXME: Include a description of the path to the volatile subobject. 14767098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_ltor_volatile_obj, 1) 14777098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith << 2 << Field; 14787098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(Field->getLocation(), diag::note_declared_at); 14797098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 14807098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 14817098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 14827098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 14837098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 1484cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } else { 1485180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is a base class. 148659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Derived = ObjType->getAsCXXRecordDecl(); 148759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base = getAsBaseClass(Sub.Entries[I]); 148859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith O = &O->getStructBase(getBaseIndex(Derived, Base)); 148959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith ObjType = Info.Ctx.getRecordType(Base); 1490cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 1491180f47959a066795cc0f409433023af448bb0328Richard Smith 1492f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (O->isUninit()) { 1493745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckingPotentialConstantExpression) 1494745f5147e065900267c85a5568785a1991d4838fRichard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_read_uninit); 1495180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1496f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1497cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 1498cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 1499b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj = CCValue(Info.Ctx, *O, CCValue::GlobalValue()); 1500cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 1501cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 1502cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 1503f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// Find the position where two subobject designators diverge, or equivalently 1504f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// the length of the common initial subsequence. 1505f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smithstatic unsigned FindDesignatorMismatch(QualType ObjType, 1506f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &A, 1507f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &B, 1508f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool &WasArrayIndex) { 1509f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned I = 0, N = std::min(A.Entries.size(), B.Entries.size()); 1510f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith for (/**/; I != N; ++I) { 1511f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!ObjType.isNull() && ObjType->isArrayType()) { 1512f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is an array element. 1513f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries[I].ArrayIndex != B.Entries[I].ArrayIndex) { 1514f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = true; 1515f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1516f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1517f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith ObjType = ObjType->castAsArrayTypeUnsafe()->getElementType(); 1518f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } else { 1519f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries[I].BaseOrMember != B.Entries[I].BaseOrMember) { 1520f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = false; 1521f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1522f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1523f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (const FieldDecl *FD = getAsField(A.Entries[I])) 1524f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is a field. 1525f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith ObjType = FD->getType(); 1526f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else 1527f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is a base class. 1528f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith ObjType = QualType(); 1529f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1530f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1531f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = false; 1532f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1533f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith} 1534f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1535f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// Determine whether the given subobject designators refer to elements of the 1536f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// same array object. 1537f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smithstatic bool AreElementsOfSameArray(QualType ObjType, 1538f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &A, 1539f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &B) { 1540f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries.size() != B.Entries.size()) 1541f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 1542f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1543f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool IsArray = A.MostDerivedArraySize != 0; 1544f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (IsArray && A.MostDerivedPathLength != A.Entries.size()) 1545f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // A is a subobject of the array element. 1546f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 1547f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1548f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // If A (and B) designates an array element, the last entry will be the array 1549f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // index. That doesn't have to match. Otherwise, we're in the 'implicit array 1550f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // of length 1' case, and the entire path must match. 1551f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool WasArrayIndex; 1552f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned CommonLength = FindDesignatorMismatch(ObjType, A, B, WasArrayIndex); 1553f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return CommonLength >= A.Entries.size() - IsArray; 1554f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith} 1555f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1556180f47959a066795cc0f409433023af448bb0328Richard Smith/// HandleLValueToRValueConversion - Perform an lvalue-to-rvalue conversion on 1557180f47959a066795cc0f409433023af448bb0328Richard Smith/// the given lvalue. This can also be used for 'lvalue-to-lvalue' conversions 1558180f47959a066795cc0f409433023af448bb0328Richard Smith/// for looking up the glvalue referred to by an entity of reference type. 1559180f47959a066795cc0f409433023af448bb0328Richard Smith/// 1560180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Info - Information about the ongoing evaluation. 1561f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// \param Conv - The expression for which we are performing the conversion. 1562f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Used for diagnostics. 15639ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith/// \param Type - The type we expect this conversion to produce, before 15649ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith/// stripping cv-qualifiers in the case of a non-clas type. 1565180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param LVal - The glvalue on which we are attempting to perform this action. 1566180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param RVal - The produced value will be placed here. 1567f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool HandleLValueToRValueConversion(EvalInfo &Info, const Expr *Conv, 1568f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith QualType Type, 1569cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const LValue &LVal, CCValue &RVal) { 15707098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // In C, an lvalue-to-rvalue conversion is never a constant expression. 15717098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!Info.getLangOpts().CPlusPlus) 15727098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.CCEDiag(Conv->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 15737098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 1574b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (LVal.Designator.Invalid) 1575b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A diagnostic will have already been produced. 1576b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1577b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 15781bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const Expr *Base = LVal.Base.dyn_cast<const Expr*>(); 1579177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith CallStackFrame *Frame = LVal.Frame; 15807098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith SourceLocation Loc = Conv->getExprLoc(); 1581c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1582f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LVal.Base) { 1583f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: Indirection through a null pointer deserves a specific diagnostic. 15847098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_invalid_subexpr_in_const_expr); 15857098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 15867098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 15877098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 15887098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // C++11 DR1311: An lvalue-to-rvalue conversion on a volatile-qualified type 15897098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // is not a constant expression (even if the object is non-volatile). We also 15907098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // apply this rule to C++98, in order to conform to the expected 'volatile' 15917098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // semantics. 15927098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Type.isVolatileQualified()) { 15937098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) 15947098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_volatile_type) << Type; 15957098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith else 15967098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 1597c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1598f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1599c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 16001bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = LVal.Base.dyn_cast<const ValueDecl*>()) { 1601c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C++98, const, non-volatile integers initialized with ICEs are ICEs. 1602c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C++11, constexpr, non-volatile variables initialized with constant 1603d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // expressions are constant expressions too. Inside constexpr functions, 1604d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // parameters are constant expressions even if they're non-const. 1605c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C, such things can also be folded, although they are not ICEs. 1606c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith const VarDecl *VD = dyn_cast<VarDecl>(D); 1607f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (const VarDecl *VDef = VD->getDefinition()) 1608f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith VD = VDef; 1609f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!VD || VD->isInvalidDecl()) { 16107098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 16110a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1612f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1613f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 16147098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // DR1313: If the object is volatile-qualified but the glvalue was not, 16157098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // behavior is undefined so the result is not a constant expression. 16161bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType VT = VD->getType(); 16177098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (VT.isVolatileQualified()) { 16187098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 16197098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_volatile_obj, 1) << 1 << VD; 16207098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 16217098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 16227098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 1623f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 16247098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 16257098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 16267098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 16277098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!isa<ParmVarDecl>(VD)) { 16287098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (VD->isConstexpr()) { 16297098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // OK, we can read this variable. 16307098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else if (VT->isIntegralOrEnumerationType()) { 16317098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!VT.isConstQualified()) { 16327098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 16337098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_non_const_int, 1) << VD; 16347098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 16357098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 16367098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 16377098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 16387098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 16397098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 16407098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else if (VT->isFloatingType() && VT.isConstQualified()) { 16417098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // We support folding of const floating-point types, in order to make 16427098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // static const data members of such types (supported as an extension) 16437098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // more useful. 16447098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 16457098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.CCEDiag(Loc, diag::note_constexpr_ltor_non_constexpr, 1) << VD; 16467098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 16477098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 16487098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.CCEDiag(Loc); 16497098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 16507098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 16517098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // FIXME: Allow folding of values of any literal type in all languages. 16527098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 16537098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_non_constexpr, 1) << VD; 16547098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 16557098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 16567098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 16577098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 16580a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1659f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 16600a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 16617098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 1662f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateVarDeclInit(Info, Conv, VD, Frame, RVal)) 1663c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1664c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 166547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith if (isa<ParmVarDecl>(VD) || !VD->getAnyInitializer()->isLValue()) 1666f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, Conv, RVal, VT, LVal.Designator, Type); 1667c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1668c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // The declaration was initialized by an lvalue, with no lvalue-to-rvalue 1669c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // conversion. This happens when the declaration and the lvalue should be 1670c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // considered synonymous, for instance when initializing an array of char 1671c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // from a string literal. Continue as if the initializer lvalue was the 1672c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // value we were originally given. 16730a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith assert(RVal.getLValueOffset().isZero() && 16740a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith "offset for lvalue init of non-reference"); 16751bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Base = RVal.getLValueBase().get<const Expr*>(); 1676177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith Frame = RVal.getLValueFrame(); 1677c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 1678c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 16797098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Volatile temporary objects cannot be read in constant expressions. 16807098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Base->getType().isVolatileQualified()) { 16817098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 16827098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_volatile_obj, 1) << 0; 16837098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(Base->getExprLoc(), diag::note_constexpr_temporary_here); 16847098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 16857098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 16867098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 16877098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 16887098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 16897098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 16900a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith // FIXME: Support PredefinedExpr, ObjCEncodeExpr, MakeStringConstant 16910a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (const StringLiteral *S = dyn_cast<StringLiteral>(Base)) { 16920a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &Designator = LVal.Designator; 1693f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Designator.Invalid || Designator.Entries.size() != 1) { 1694dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(Conv->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 16950a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1696f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 16970a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 16980a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith assert(Type->isIntegerType() && "string element not integer type"); 16999a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith uint64_t Index = Designator.Entries[0].ArrayIndex; 17007098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith const ConstantArrayType *CAT = 17017098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Ctx.getAsConstantArrayType(S->getType()); 17027098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Index >= CAT->getSize().getZExtValue()) { 17037098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Note, it should not be possible to form a pointer which points more 17047098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // than one past the end of the array without producing a prior const expr 17057098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // diagnostic. 17067098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_read_past_end); 17070a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1708f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 17090a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith APSInt Value(S->getCharByteWidth() * Info.Ctx.getCharWidth(), 17100a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Type->isUnsignedIntegerType()); 17110a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (Index < S->getLength()) 17120a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Value = S->getCodeUnit(Index); 17130a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith RVal = CCValue(Value); 17140a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 17150a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 17160a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 1717177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (Frame) { 1718cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // If this is a temporary expression with a nontrivial initializer, grab the 1719cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // value from the relevant stack frame. 1720177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith RVal = Frame->Temporaries[Base]; 1721cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } else if (const CompoundLiteralExpr *CLE 1722cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith = dyn_cast<CompoundLiteralExpr>(Base)) { 1723cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // In C99, a CompoundLiteralExpr is an lvalue, and we defer evaluating the 1724cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // initializer until now for such expressions. Such an expression can't be 1725cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // an ICE in C, so this only matters for fold. 1726c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(!Info.getLangOpts().CPlusPlus && "lvalue compound literal in c++?"); 1727cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (!Evaluate(RVal, Info, CLE->getInitializer())) 1728cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1729f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } else { 1730dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(Conv->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1731cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1732f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1733c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1734f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, Conv, RVal, Base->getType(), LVal.Designator, 1735f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Type); 1736c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 1737c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 173859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// Build an lvalue for the object argument of a member function call. 173959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic bool EvaluateObjectArgument(EvalInfo &Info, const Expr *Object, 174059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith LValue &This) { 174159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (Object->getType()->isPointerType()) 174259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return EvaluatePointer(Object, This, Info); 174359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 174459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (Object->isGLValue()) 174559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return EvaluateLValue(Object, This, Info); 174659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1747e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Object->getType()->isLiteralType()) 1748e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateTemporary(Object, This, Info); 1749e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1750e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 1751e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 1752e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1753e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// HandleMemberPointerAccess - Evaluate a member access operation and build an 1754e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// lvalue referring to the result. 1755e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// 1756e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param Info - Information about the ongoing evaluation. 1757e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param BO - The member pointer access operation. 1758e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param LV - Filled in with a reference to the resulting object. 1759e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param IncludeMember - Specifies whether the member itself is included in 1760e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// the resulting LValue subobject designator. This is not possible when 1761e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// creating a bound member function. 1762e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \return The field or method declaration to which the member pointer refers, 1763e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// or 0 if evaluation fails. 1764e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic const ValueDecl *HandleMemberPointerAccess(EvalInfo &Info, 1765e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const BinaryOperator *BO, 1766e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &LV, 1767e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool IncludeMember = true) { 1768e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(BO->getOpcode() == BO_PtrMemD || BO->getOpcode() == BO_PtrMemI); 1769e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1770745f5147e065900267c85a5568785a1991d4838fRichard Smith bool EvalObjOK = EvaluateObjectArgument(Info, BO->getLHS(), LV); 1771745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalObjOK && !Info.keepEvaluatingAfterFailure()) 1772e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1773e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1774e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr MemPtr; 1775e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateMemberPointer(BO->getRHS(), MemPtr, Info)) 1776e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1777e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1778e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.mptr.oper]p6: If the second operand is the null pointer to 1779e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // member value, the behavior is undefined. 1780e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!MemPtr.getDecl()) 1781e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1782e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1783745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalObjOK) 1784745f5147e065900267c85a5568785a1991d4838fRichard Smith return 0; 1785745f5147e065900267c85a5568785a1991d4838fRichard Smith 1786e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (MemPtr.isDerivedMember()) { 1787e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // This is a member of some derived class. Truncate LV appropriately. 1788e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // The end of the derived-to-base path for the base object must match the 1789e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // derived-to-base path for the member pointer. 1790b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (LV.Designator.MostDerivedPathLength + MemPtr.Path.size() > 1791e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.size()) 1792e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1793e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith unsigned PathLengthToMember = 1794e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.size() - MemPtr.Path.size(); 1795e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = 0, N = MemPtr.Path.size(); I != N; ++I) { 1796e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *LVDecl = getAsBaseClass( 1797e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries[PathLengthToMember + I]); 1798e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *MPDecl = MemPtr.Path[I]; 1799e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (LVDecl->getCanonicalDecl() != MPDecl->getCanonicalDecl()) 1800e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1801e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1802e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1803e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Truncate the lvalue to the appropriate derived class. 1804b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!CastToDerivedClass(Info, BO, LV, MemPtr.getContainingRecord(), 1805b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith PathLengthToMember)) 1806b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return 0; 1807e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else if (!MemPtr.Path.empty()) { 1808e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Extend the LValue path with the member pointer's path. 1809e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.reserve(LV.Designator.Entries.size() + 1810e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemPtr.Path.size() + IncludeMember); 1811e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1812e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Walk down to the appropriate base class. 1813e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType LVType = BO->getLHS()->getType(); 1814e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const PointerType *PT = LVType->getAs<PointerType>()) 1815e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LVType = PT->getPointeeType(); 1816e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *RD = LVType->getAsCXXRecordDecl(); 1817e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(RD && "member pointer access on non-class-type expression"); 1818e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // The first class in the path is that of the lvalue. 1819e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = 1, N = MemPtr.Path.size(); I != N; ++I) { 1820e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Base = MemPtr.Path[N - I - 1]; 1821b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, BO, LV, RD, Base); 1822e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RD = Base; 1823e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1824e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Finally cast to the class containing the member. 1825b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, BO, LV, RD, MemPtr.getContainingRecord()); 1826e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1827e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1828e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Add the member. Note that we cannot build bound member functions here. 1829e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (IncludeMember) { 1830d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(MemPtr.getDecl())) 1831d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueMember(Info, BO, LV, FD); 1832d9b02e726262e4009dda830998bb934172ac0020Richard Smith else if (const IndirectFieldDecl *IFD = 1833d9b02e726262e4009dda830998bb934172ac0020Richard Smith dyn_cast<IndirectFieldDecl>(MemPtr.getDecl())) 1834d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueIndirectMember(Info, BO, LV, IFD); 1835d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 1836d9b02e726262e4009dda830998bb934172ac0020Richard Smith llvm_unreachable("can't construct reference to bound member function"); 1837e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1838e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1839e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return MemPtr.getDecl(); 1840e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 1841e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1842e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// HandleBaseToDerivedCast - Apply the given base-to-derived cast operation on 1843e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// the provided lvalue, which currently refers to the base object. 1844e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool HandleBaseToDerivedCast(EvalInfo &Info, const CastExpr *E, 1845e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &Result) { 1846e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith SubobjectDesignator &D = Result.Designator; 1847b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.Invalid || !Result.checkNullPointer(Info, E, CSK_Derived)) 1848e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 1849e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1850e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType TargetQT = E->getType(); 1851e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const PointerType *PT = TargetQT->getAs<PointerType>()) 1852e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith TargetQT = PT->getPointeeType(); 1853b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1854b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check this cast lands within the final derived-to-base subobject path. 1855b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.MostDerivedPathLength + E->path_size() > D.Entries.size()) { 1856b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_invalid_downcast) 1857b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << D.MostDerivedType << TargetQT; 1858b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1859b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1860b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1861b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check the type of the final cast. We don't need to check the path, 1862b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // since a cast can only be formed if the path is unique. 1863b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned NewEntriesSize = D.Entries.size() - E->path_size(); 1864e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *TargetType = TargetQT->getAsCXXRecordDecl(); 1865e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *FinalType; 1866b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (NewEntriesSize == D.MostDerivedPathLength) 1867b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith FinalType = D.MostDerivedType->getAsCXXRecordDecl(); 1868b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 1869e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith FinalType = getAsBaseClass(D.Entries[NewEntriesSize - 1]); 1870b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (FinalType->getCanonicalDecl() != TargetType->getCanonicalDecl()) { 1871b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_invalid_downcast) 1872b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << D.MostDerivedType << TargetQT; 1873e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 1874b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1875e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1876e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Truncate the lvalue to the appropriate derived class. 1877b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return CastToDerivedClass(Info, E, Result, TargetType, NewEntriesSize); 187859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 187959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1880c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stumpnamespace { 1881d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smithenum EvalStmtResult { 1882d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Evaluation failed. 1883d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Failed, 1884d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Hit a 'return' statement. 1885d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Returned, 1886d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Evaluation succeeded. 1887d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Succeeded 1888d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith}; 1889d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 1890d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 1891d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith// Evaluate a statement. 1892c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic EvalStmtResult EvaluateStmt(APValue &Result, EvalInfo &Info, 1893d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith const Stmt *S) { 1894d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith switch (S->getStmtClass()) { 1895d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith default: 1896d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Failed; 1897d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 1898d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::NullStmtClass: 1899d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::DeclStmtClass: 1900d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Succeeded; 1901d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 1902c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith case Stmt::ReturnStmtClass: { 1903c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCValue CCResult; 1904c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const Expr *RetExpr = cast<ReturnStmt>(S)->getRetValue(); 1905c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!Evaluate(CCResult, Info, RetExpr) || 1906c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith !CheckConstantExpression(Info, RetExpr, CCResult, Result, 1907c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_ReturnValue)) 1908c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return ESR_Failed; 1909c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return ESR_Returned; 1910c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 1911d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 1912d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::CompoundStmtClass: { 1913d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith const CompoundStmt *CS = cast<CompoundStmt>(S); 1914d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith for (CompoundStmt::const_body_iterator BI = CS->body_begin(), 1915d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith BE = CS->body_end(); BI != BE; ++BI) { 1916d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith EvalStmtResult ESR = EvaluateStmt(Result, Info, *BI); 1917d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (ESR != ESR_Succeeded) 1918d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR; 1919d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 1920d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Succeeded; 1921d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 1922d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 1923d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 1924d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 19256180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// CheckTrivialDefaultConstructor - Check whether a constructor is a trivial 19266180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// default constructor. If so, we'll fold it whether or not it's marked as 19276180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// constexpr. If it is marked as constexpr, we will never implicitly define it, 19286180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// so we need special handling. 19296180245e9f63d2927b185ec251fb75aba30f1cacRichard Smithstatic bool CheckTrivialDefaultConstructor(EvalInfo &Info, SourceLocation Loc, 193051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXConstructorDecl *CD, 193151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool IsValueInitialization) { 19326180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (!CD->isTrivial() || !CD->isDefaultConstructor()) 19336180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return false; 19346180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 19354c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // Value-initialization does not call a trivial default constructor, so such a 19364c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // call is a core constant expression whether or not the constructor is 19374c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // constexpr. 19384c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!CD->isConstexpr() && !IsValueInitialization) { 19396180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (Info.getLangOpts().CPlusPlus0x) { 19404c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // FIXME: If DiagDecl is an implicitly-declared special member function, 19414c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // we should be much more explicit about why it's not constexpr. 19424c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Info.CCEDiag(Loc, diag::note_constexpr_invalid_function, 1) 19434c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith << /*IsConstexpr*/0 << /*IsConstructor*/1 << CD; 19444c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Info.Note(CD->getLocation(), diag::note_declared_at); 19456180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } else { 19466180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Info.CCEDiag(Loc, diag::note_invalid_subexpr_in_const_expr); 19476180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 19486180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 19496180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 19506180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith} 19516180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 1952c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith/// CheckConstexprFunction - Check that a function can be called in a constant 1953c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith/// expression. 1954c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool CheckConstexprFunction(EvalInfo &Info, SourceLocation CallLoc, 1955c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Declaration, 1956c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Definition) { 1957745f5147e065900267c85a5568785a1991d4838fRichard Smith // Potential constant expressions can contain calls to declared, but not yet 1958745f5147e065900267c85a5568785a1991d4838fRichard Smith // defined, constexpr functions. 1959745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression && !Definition && 1960745f5147e065900267c85a5568785a1991d4838fRichard Smith Declaration->isConstexpr()) 1961745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1962745f5147e065900267c85a5568785a1991d4838fRichard Smith 1963c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith // Can we evaluate this function call? 1964c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Definition && Definition->isConstexpr() && !Definition->isInvalidDecl()) 1965c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1966c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 1967c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 1968c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *DiagDecl = Definition ? Definition : Declaration; 1969099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // FIXME: If DiagDecl is an implicitly-declared special member function, we 1970099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // should be much more explicit about why it's not constexpr. 1971c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(CallLoc, diag::note_constexpr_invalid_function, 1) 1972c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << DiagDecl->isConstexpr() << isa<CXXConstructorDecl>(DiagDecl) 1973c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << DiagDecl; 1974c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Note(DiagDecl->getLocation(), diag::note_declared_at); 1975c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else { 1976c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(CallLoc, diag::note_invalid_subexpr_in_const_expr); 1977c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 1978c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 1979c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith} 1980c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 1981180f47959a066795cc0f409433023af448bb0328Richard Smithnamespace { 1982cd99b072e8b32075da6233cbf14ea58a5c82de4fRichard Smithtypedef SmallVector<CCValue, 8> ArgVector; 1983180f47959a066795cc0f409433023af448bb0328Richard Smith} 1984180f47959a066795cc0f409433023af448bb0328Richard Smith 1985180f47959a066795cc0f409433023af448bb0328Richard Smith/// EvaluateArgs - Evaluate the arguments to a function call. 1986180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateArgs(ArrayRef<const Expr*> Args, ArgVector &ArgValues, 1987180f47959a066795cc0f409433023af448bb0328Richard Smith EvalInfo &Info) { 1988745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 1989180f47959a066795cc0f409433023af448bb0328Richard Smith for (ArrayRef<const Expr*>::iterator I = Args.begin(), E = Args.end(); 1990745f5147e065900267c85a5568785a1991d4838fRichard Smith I != E; ++I) { 1991745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Evaluate(ArgValues[I - Args.begin()], Info, *I)) { 1992745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking for a potential constant expression, evaluate all 1993745f5147e065900267c85a5568785a1991d4838fRichard Smith // initializers even if some of them fail. 1994745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 1995745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1996745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 1997745f5147e065900267c85a5568785a1991d4838fRichard Smith } 1998745f5147e065900267c85a5568785a1991d4838fRichard Smith } 1999745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 2000180f47959a066795cc0f409433023af448bb0328Richard Smith} 2001180f47959a066795cc0f409433023af448bb0328Richard Smith 2002d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith/// Evaluate a function call. 2003745f5147e065900267c85a5568785a1991d4838fRichard Smithstatic bool HandleFunctionCall(SourceLocation CallLoc, 2004745f5147e065900267c85a5568785a1991d4838fRichard Smith const FunctionDecl *Callee, const LValue *This, 2005f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ArrayRef<const Expr*> Args, const Stmt *Body, 2006c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith EvalInfo &Info, APValue &Result) { 2007180f47959a066795cc0f409433023af448bb0328Richard Smith ArgVector ArgValues(Args.size()); 2008180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArgs(Args, ArgValues, Info)) 2009180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2010d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2011745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckCallLimit(CallLoc)) 2012745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2013745f5147e065900267c85a5568785a1991d4838fRichard Smith 2014745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackFrame Frame(Info, CallLoc, Callee, This, ArgValues.data()); 2015d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return EvaluateStmt(Result, Info, Body) == ESR_Returned; 2016d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 2017d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2018180f47959a066795cc0f409433023af448bb0328Richard Smith/// Evaluate a constructor call. 2019745f5147e065900267c85a5568785a1991d4838fRichard Smithstatic bool HandleConstructorCall(SourceLocation CallLoc, const LValue &This, 202059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith ArrayRef<const Expr*> Args, 2021180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXConstructorDecl *Definition, 202251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith EvalInfo &Info, APValue &Result) { 2023180f47959a066795cc0f409433023af448bb0328Richard Smith ArgVector ArgValues(Args.size()); 2024180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArgs(Args, ArgValues, Info)) 2025180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2026180f47959a066795cc0f409433023af448bb0328Richard Smith 2027745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckCallLimit(CallLoc)) 2028745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2029745f5147e065900267c85a5568785a1991d4838fRichard Smith 2030745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackFrame Frame(Info, CallLoc, Definition, &This, ArgValues.data()); 2031180f47959a066795cc0f409433023af448bb0328Richard Smith 2032180f47959a066795cc0f409433023af448bb0328Richard Smith // If it's a delegating constructor, just delegate. 2033180f47959a066795cc0f409433023af448bb0328Richard Smith if (Definition->isDelegatingConstructor()) { 2034180f47959a066795cc0f409433023af448bb0328Richard Smith CXXConstructorDecl::init_const_iterator I = Definition->init_begin(); 2035180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateConstantExpression(Result, Info, This, (*I)->getInit()); 2036180f47959a066795cc0f409433023af448bb0328Richard Smith } 2037180f47959a066795cc0f409433023af448bb0328Richard Smith 2038610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // For a trivial copy or move constructor, perform an APValue copy. This is 2039610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // essential for unions, where the operations performed by the constructor 2040610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // cannot be represented by ctor-initializers. 2041180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *RD = Definition->getParent(); 2042610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith if (Definition->isDefaulted() && 2043610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith ((Definition->isCopyConstructor() && RD->hasTrivialCopyConstructor()) || 2044610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith (Definition->isMoveConstructor() && RD->hasTrivialMoveConstructor()))) { 2045610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith LValue RHS; 2046610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith RHS.setFrom(ArgValues[0]); 2047610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith CCValue Value; 2048745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!HandleLValueToRValueConversion(Info, Args[0], Args[0]->getType(), 2049745f5147e065900267c85a5568785a1991d4838fRichard Smith RHS, Value)) 2050745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2051745f5147e065900267c85a5568785a1991d4838fRichard Smith assert((Value.isStruct() || Value.isUnion()) && 2052745f5147e065900267c85a5568785a1991d4838fRichard Smith "trivial copy/move from non-class type?"); 2053745f5147e065900267c85a5568785a1991d4838fRichard Smith // Any CCValue of class type must already be a constant expression. 2054745f5147e065900267c85a5568785a1991d4838fRichard Smith Result = Value; 2055745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 2056610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith } 2057610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith 2058610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // Reserve space for the struct members. 205951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!RD->isUnion() && Result.isUninit()) 2060180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitStruct(), RD->getNumBases(), 2061180f47959a066795cc0f409433023af448bb0328Richard Smith std::distance(RD->field_begin(), RD->field_end())); 2062180f47959a066795cc0f409433023af448bb0328Richard Smith 2063180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 2064180f47959a066795cc0f409433023af448bb0328Richard Smith 2065745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 2066180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned BasesSeen = 0; 2067180f47959a066795cc0f409433023af448bb0328Richard Smith#ifndef NDEBUG 2068180f47959a066795cc0f409433023af448bb0328Richard Smith CXXRecordDecl::base_class_const_iterator BaseIt = RD->bases_begin(); 2069180f47959a066795cc0f409433023af448bb0328Richard Smith#endif 2070180f47959a066795cc0f409433023af448bb0328Richard Smith for (CXXConstructorDecl::init_const_iterator I = Definition->init_begin(), 2071180f47959a066795cc0f409433023af448bb0328Richard Smith E = Definition->init_end(); I != E; ++I) { 2072745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue Subobject = This; 2073745f5147e065900267c85a5568785a1991d4838fRichard Smith APValue *Value = &Result; 2074745f5147e065900267c85a5568785a1991d4838fRichard Smith 2075745f5147e065900267c85a5568785a1991d4838fRichard Smith // Determine the subobject to initialize. 2076180f47959a066795cc0f409433023af448bb0328Richard Smith if ((*I)->isBaseInitializer()) { 2077180f47959a066795cc0f409433023af448bb0328Richard Smith QualType BaseType((*I)->getBaseClass(), 0); 2078180f47959a066795cc0f409433023af448bb0328Richard Smith#ifndef NDEBUG 2079180f47959a066795cc0f409433023af448bb0328Richard Smith // Non-virtual base classes are initialized in the order in the class 2080180f47959a066795cc0f409433023af448bb0328Richard Smith // definition. We cannot have a virtual base class for a literal type. 2081180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!BaseIt->isVirtual() && "virtual base for literal type"); 2082180f47959a066795cc0f409433023af448bb0328Richard Smith assert(Info.Ctx.hasSameType(BaseIt->getType(), BaseType) && 2083180f47959a066795cc0f409433023af448bb0328Richard Smith "base class initializers not in expected order"); 2084180f47959a066795cc0f409433023af448bb0328Richard Smith ++BaseIt; 2085180f47959a066795cc0f409433023af448bb0328Richard Smith#endif 2086b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, (*I)->getInit(), Subobject, RD, 2087180f47959a066795cc0f409433023af448bb0328Richard Smith BaseType->getAsCXXRecordDecl(), &Layout); 2088745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getStructBase(BasesSeen++); 2089180f47959a066795cc0f409433023af448bb0328Richard Smith } else if (FieldDecl *FD = (*I)->getMember()) { 2090b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, (*I)->getInit(), Subobject, FD, &Layout); 2091180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 2092180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(FD); 2093745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getUnionValue(); 2094745f5147e065900267c85a5568785a1991d4838fRichard Smith } else { 2095745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getStructField(FD->getFieldIndex()); 2096745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2097d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else if (IndirectFieldDecl *IFD = (*I)->getIndirectMember()) { 2098d9b02e726262e4009dda830998bb934172ac0020Richard Smith // Walk the indirect field decl's chain to find the object to initialize, 2099d9b02e726262e4009dda830998bb934172ac0020Richard Smith // and make sure we've initialized every step along it. 2100d9b02e726262e4009dda830998bb934172ac0020Richard Smith for (IndirectFieldDecl::chain_iterator C = IFD->chain_begin(), 2101d9b02e726262e4009dda830998bb934172ac0020Richard Smith CE = IFD->chain_end(); 2102d9b02e726262e4009dda830998bb934172ac0020Richard Smith C != CE; ++C) { 2103d9b02e726262e4009dda830998bb934172ac0020Richard Smith FieldDecl *FD = cast<FieldDecl>(*C); 2104d9b02e726262e4009dda830998bb934172ac0020Richard Smith CXXRecordDecl *CD = cast<CXXRecordDecl>(FD->getParent()); 2105d9b02e726262e4009dda830998bb934172ac0020Richard Smith // Switch the union field if it differs. This happens if we had 2106d9b02e726262e4009dda830998bb934172ac0020Richard Smith // preceding zero-initialization, and we're now initializing a union 2107d9b02e726262e4009dda830998bb934172ac0020Richard Smith // subobject other than the first. 2108d9b02e726262e4009dda830998bb934172ac0020Richard Smith // FIXME: In this case, the values of the other subobjects are 2109d9b02e726262e4009dda830998bb934172ac0020Richard Smith // specified, since zero-initialization sets all padding bits to zero. 2110d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (Value->isUninit() || 2111d9b02e726262e4009dda830998bb934172ac0020Richard Smith (Value->isUnion() && Value->getUnionField() != FD)) { 2112d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (CD->isUnion()) 2113d9b02e726262e4009dda830998bb934172ac0020Richard Smith *Value = APValue(FD); 2114d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 2115d9b02e726262e4009dda830998bb934172ac0020Richard Smith *Value = APValue(APValue::UninitStruct(), CD->getNumBases(), 2116d9b02e726262e4009dda830998bb934172ac0020Richard Smith std::distance(CD->field_begin(), CD->field_end())); 2117d9b02e726262e4009dda830998bb934172ac0020Richard Smith } 2118745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleLValueMember(Info, (*I)->getInit(), Subobject, FD); 2119d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (CD->isUnion()) 2120d9b02e726262e4009dda830998bb934172ac0020Richard Smith Value = &Value->getUnionValue(); 2121d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 2122d9b02e726262e4009dda830998bb934172ac0020Richard Smith Value = &Value->getStructField(FD->getFieldIndex()); 2123d9b02e726262e4009dda830998bb934172ac0020Richard Smith } 2124180f47959a066795cc0f409433023af448bb0328Richard Smith } else { 2125d9b02e726262e4009dda830998bb934172ac0020Richard Smith llvm_unreachable("unknown base initializer kind"); 2126180f47959a066795cc0f409433023af448bb0328Richard Smith } 2127745f5147e065900267c85a5568785a1991d4838fRichard Smith 2128745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateConstantExpression(*Value, Info, Subobject, (*I)->getInit(), 2129745f5147e065900267c85a5568785a1991d4838fRichard Smith (*I)->isBaseInitializer() 2130745f5147e065900267c85a5568785a1991d4838fRichard Smith ? CCEK_Constant : CCEK_MemberInit)) { 2131745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking for a potential constant expression, evaluate all 2132745f5147e065900267c85a5568785a1991d4838fRichard Smith // initializers even if some of them fail. 2133745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 2134745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2135745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 2136745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2137180f47959a066795cc0f409433023af448bb0328Richard Smith } 2138180f47959a066795cc0f409433023af448bb0328Richard Smith 2139745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 2140180f47959a066795cc0f409433023af448bb0328Richard Smith} 2141180f47959a066795cc0f409433023af448bb0328Richard Smith 2142d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smithnamespace { 2143770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass HasSideEffect 21448cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ConstStmtVisitor<HasSideEffect, bool> { 21451e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith const ASTContext &Ctx; 2146c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stumppublic: 2147c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 21481e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith HasSideEffect(const ASTContext &C) : Ctx(C) {} 2149c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 2150c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // Unhandled nodes conservatively default to having side effects. 21518cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStmt(const Stmt *S) { 2152c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 2153c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 2154c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 21558cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitParenExpr(const ParenExpr *E) { return Visit(E->getSubExpr()); } 21568cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitGenericSelectionExpr(const GenericSelectionExpr *E) { 2157f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne return Visit(E->getResultExpr()); 2158f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne } 21598cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitDeclRefExpr(const DeclRefExpr *E) { 21601e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2161c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 2162c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return false; 2163c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 2164f85e193739c953358c865005855253af4f68a497John McCall bool VisitObjCIvarRefExpr(const ObjCIvarRefExpr *E) { 21651e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2166f85e193739c953358c865005855253af4f68a497John McCall return true; 2167f85e193739c953358c865005855253af4f68a497John McCall return false; 2168f85e193739c953358c865005855253af4f68a497John McCall } 2169f85e193739c953358c865005855253af4f68a497John McCall bool VisitBlockDeclRefExpr (const BlockDeclRefExpr *E) { 21701e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2171f85e193739c953358c865005855253af4f68a497John McCall return true; 2172f85e193739c953358c865005855253af4f68a497John McCall return false; 2173f85e193739c953358c865005855253af4f68a497John McCall } 2174f85e193739c953358c865005855253af4f68a497John McCall 2175c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // We don't want to evaluate BlockExprs multiple times, as they generate 2176c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // a ton of code. 21778cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBlockExpr(const BlockExpr *E) { return true; } 21788cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitPredefinedExpr(const PredefinedExpr *E) { return false; } 21798cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) 2180c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump { return Visit(E->getInitializer()); } 21818cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitMemberExpr(const MemberExpr *E) { return Visit(E->getBase()); } 21828cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitIntegerLiteral(const IntegerLiteral *E) { return false; } 21838cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitFloatingLiteral(const FloatingLiteral *E) { return false; } 21848cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStringLiteral(const StringLiteral *E) { return false; } 21858cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCharacterLiteral(const CharacterLiteral *E) { return false; } 21868cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E) 2187f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne { return false; } 21888cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E) 2189980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump { return Visit(E->getLHS()) || Visit(E->getRHS()); } 21908cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitChooseExpr(const ChooseExpr *E) 21911e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith { return Visit(E->getChosenSubExpr(Ctx)); } 21928cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E) { return Visit(E->getSubExpr()); } 21938cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBinAssign(const BinaryOperator *E) { return true; } 21948cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundAssignOperator(const BinaryOperator *E) { return true; } 21958cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBinaryOperator(const BinaryOperator *E) 2196980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump { return Visit(E->getLHS()) || Visit(E->getRHS()); } 21978cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPreInc(const UnaryOperator *E) { return true; } 21988cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPostInc(const UnaryOperator *E) { return true; } 21998cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPreDec(const UnaryOperator *E) { return true; } 22008cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPostDec(const UnaryOperator *E) { return true; } 22018cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryDeref(const UnaryOperator *E) { 22021e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2203c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 2204980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump return Visit(E->getSubExpr()); 2205c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 22068cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryOperator(const UnaryOperator *E) { return Visit(E->getSubExpr()); } 2207363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner 2208363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner // Has side effects if any element does. 22098cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitInitListExpr(const InitListExpr *E) { 2210363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner for (unsigned i = 0, e = E->getNumInits(); i != e; ++i) 2211363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner if (Visit(E->getInit(i))) return true; 22128cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (const Expr *filler = E->getArrayFiller()) 22134423ac0282acb8ba801eb05b38712438dc0c1e3eArgyrios Kyrtzidis return Visit(filler); 2214363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner return false; 2215363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner } 2216ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor 22178cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitSizeOfPackExpr(const SizeOfPackExpr *) { return false; } 2218c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump}; 2219c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 222056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCallclass OpaqueValueEvaluation { 222156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall EvalInfo &info; 222256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall OpaqueValueExpr *opaqueValue; 222356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 222456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCallpublic: 222556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall OpaqueValueEvaluation(EvalInfo &info, OpaqueValueExpr *opaqueValue, 222656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall Expr *value) 222756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall : info(info), opaqueValue(opaqueValue) { 222856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 222956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall // If evaluation fails, fail immediately. 22301e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!Evaluate(info.OpaqueValues[opaqueValue], info, value)) { 223156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall this->opaqueValue = 0; 223256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall return; 223356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 223456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 223556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 223656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall bool hasError() const { return opaqueValue == 0; } 223756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 223856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ~OpaqueValueEvaluation() { 22391e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith // FIXME: This will not work for recursive constexpr functions using opaque 22401e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith // values. Restore the former value. 224156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (opaqueValue) info.OpaqueValues.erase(opaqueValue); 224256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 224356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall}; 224456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 2245c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump} // end anonymous namespace 2246c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 22474efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 22488cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne// Generic Evaluation 22498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne//===----------------------------------------------------------------------===// 22508cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournenamespace { 22518cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2252f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith// FIXME: RetTy is always bool. Remove it. 2253f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithtemplate <class Derived, typename RetTy=bool> 22548cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneclass ExprEvaluatorBase 22558cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ConstStmtVisitor<Derived, RetTy> { 22568cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneprivate: 225747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith RetTy DerivedSuccess(const CCValue &V, const Expr *E) { 22588cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return static_cast<Derived*>(this)->Success(V, E); 22598cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 226051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RetTy DerivedZeroInitialization(const Expr *E) { 226151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return static_cast<Derived*>(this)->ZeroInitialization(E); 2262f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 22638cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 22648cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneprotected: 22658cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne EvalInfo &Info; 22668cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne typedef ConstStmtVisitor<Derived, RetTy> StmtVisitorTy; 22678cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne typedef ExprEvaluatorBase ExprEvaluatorBaseTy; 22688cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2269dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith OptionalDiagnostic CCEDiag(const Expr *E, diag::kind D) { 2270d5093420308784e31071c8cd723a58d74159f393Richard Smith return Info.CCEDiag(E->getExprLoc(), D); 2271f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2272f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 2273f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// Report an evaluation error. This should only be called when an error is 2274f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// first discovered. When propagating an error, just return false. 2275f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool Error(const Expr *E, diag::kind D) { 2276dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), D); 2277f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2278f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2279f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool Error(const Expr *E) { 2280f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_invalid_subexpr_in_const_expr); 2281f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2282f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 228351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RetTy ZeroInitialization(const Expr *E) { return Error(E); } 2284f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 22858cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournepublic: 22868cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne ExprEvaluatorBase(EvalInfo &Info) : Info(Info) {} 22878cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 22888cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitStmt(const Stmt *) { 2289b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Expression evaluator should not be called on stmts"); 22908cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 22918cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitExpr(const Expr *E) { 2292f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 22938cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 22948cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 22958cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitParenExpr(const ParenExpr *E) 22968cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 22978cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitUnaryExtension(const UnaryOperator *E) 22988cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 22998cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitUnaryPlus(const UnaryOperator *E) 23008cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 23018cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitChooseExpr(const ChooseExpr *E) 23028cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getChosenSubExpr(Info.Ctx)); } 23038cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitGenericSelectionExpr(const GenericSelectionExpr *E) 23048cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getResultExpr()); } 230591a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall RetTy VisitSubstNonTypeTemplateParmExpr(const SubstNonTypeTemplateParmExpr *E) 230691a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall { return StmtVisitorTy::Visit(E->getReplacement()); } 23073d75ca836205856077c18e30e9447accbd85f751Richard Smith RetTy VisitCXXDefaultArgExpr(const CXXDefaultArgExpr *E) 23083d75ca836205856077c18e30e9447accbd85f751Richard Smith { return StmtVisitorTy::Visit(E->getExpr()); } 2309bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith // We cannot create any objects for which cleanups are required, so there is 2310bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith // nothing to do here; all cleanups must come from unevaluated subexpressions. 2311bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith RetTy VisitExprWithCleanups(const ExprWithCleanups *E) 2312bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith { return StmtVisitorTy::Visit(E->getSubExpr()); } 23138cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2314c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith RetTy VisitCXXReinterpretCastExpr(const CXXReinterpretCastExpr *E) { 2315c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 0; 2316c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith return static_cast<Derived*>(this)->VisitCastExpr(E); 2317c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith } 2318c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith RetTy VisitCXXDynamicCastExpr(const CXXDynamicCastExpr *E) { 2319c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 1; 2320c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith return static_cast<Derived*>(this)->VisitCastExpr(E); 2321c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith } 2322c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 2323e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RetTy VisitBinaryOperator(const BinaryOperator *E) { 2324e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getOpcode()) { 2325e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2326f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2327e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2328e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_Comma: 2329e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith VisitIgnoredValue(E->getLHS()); 2330e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return StmtVisitorTy::Visit(E->getRHS()); 2331e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2332e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemD: 2333e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemI: { 2334e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue Obj; 2335e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!HandleMemberPointerAccess(Info, E, Obj)) 2336e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2337e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith CCValue Result; 2338f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), Obj, Result)) 2339e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2340e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DerivedSuccess(Result, E); 2341e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2342e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2343e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2344e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 23458cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitBinaryConditionalOperator(const BinaryConditionalOperator *E) { 23468cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne OpaqueValueEvaluation opaque(Info, E->getOpaqueValue(), E->getCommon()); 23478cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (opaque.hasError()) 2348f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 23498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 23508cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool cond; 2351c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateAsBooleanCondition(E->getCond(), cond, Info)) 2352f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 23538cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 23548cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return StmtVisitorTy::Visit(cond ? E->getTrueExpr() : E->getFalseExpr()); 23558cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 23568cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 23578cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitConditionalOperator(const ConditionalOperator *E) { 2358f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool IsBcpCall = false; 2359f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // If the condition (ignoring parens) is a __builtin_constant_p call, 2360f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // the result is a constant expression if it can be folded without 2361f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // side-effects. This is an important GNU extension. See GCC PR38377 2362f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // for discussion. 2363f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (const CallExpr *CallCE = 2364f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith dyn_cast<CallExpr>(E->getCond()->IgnoreParenCasts())) 2365f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (CallCE->isBuiltinCall() == Builtin::BI__builtin_constant_p) 2366f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith IsBcpCall = true; 2367f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2368f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Always assume __builtin_constant_p(...) ? ... : ... is a potential 2369f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // constant expression; we can't check whether it's potentially foldable. 2370f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (Info.CheckingPotentialConstantExpression && IsBcpCall) 2371f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 2372f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2373f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith FoldConstant Fold(Info); 2374f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 23758cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool BoolResult; 2376c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateAsBooleanCondition(E->getCond(), BoolResult, Info)) 2377f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 23788cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2379c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Expr *EvalExpr = BoolResult ? E->getTrueExpr() : E->getFalseExpr(); 2380f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!StmtVisitorTy::Visit(EvalExpr)) 2381f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 2382f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2383f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (IsBcpCall) 2384f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Fold.Fold(Info); 2385f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2386f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return true; 23878cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 23888cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 23898cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitOpaqueValueExpr(const OpaqueValueExpr *E) { 239047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith const CCValue *Value = Info.getOpaqueValue(E); 239142786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (!Value) { 239242786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis const Expr *Source = E->getSourceExpr(); 239342786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (!Source) 2394f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 239542786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (Source == E) { // sanity checking. 239642786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis assert(0 && "OpaqueValueExpr recursively refers to itself"); 2397f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 239842786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis } 239942786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis return StmtVisitorTy::Visit(Source); 240042786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis } 240147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return DerivedSuccess(*Value, E); 24028cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 2403f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 2404d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith RetTy VisitCallExpr(const CallExpr *E) { 2405e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const Expr *Callee = E->getCallee()->IgnoreParens(); 2406d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith QualType CalleeType = Callee->getType(); 2407d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 24086142ca7790aa09a6e13592b70f142cc4bbcadcaeDevang Patel const FunctionDecl *FD = 0; 240959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith LValue *This = 0, ThisVal; 241059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 241159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 241259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Extract function decl and 'this' pointer from the callee. 241359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (CalleeType->isSpecificBuiltinType(BuiltinType::BoundMember)) { 2414f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const ValueDecl *Member = 0; 2415e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const MemberExpr *ME = dyn_cast<MemberExpr>(Callee)) { 2416e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Explicit bound member calls, such as x.f() or p->g(); 2417e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateObjectArgument(Info, ME->getBase(), ThisVal)) 2418f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2419f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Member = ME->getMemberDecl(); 2420e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith This = &ThisVal; 2421e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else if (const BinaryOperator *BE = dyn_cast<BinaryOperator>(Callee)) { 2422e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Indirect bound member calls ('.*' or '->*'). 2423f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Member = HandleMemberPointerAccess(Info, BE, ThisVal, false); 2424f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Member) return false; 2425e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith This = &ThisVal; 2426e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else 2427f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 2428f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 2429f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith FD = dyn_cast<FunctionDecl>(Member); 2430f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!FD) 2431f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 243259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } else if (CalleeType->isFunctionPointerType()) { 2433b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LValue Call; 2434b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!EvaluatePointer(Callee, Call, Info)) 2435f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 243659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2437b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Call.getLValueOffset().isZero()) 2438f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 24391bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith FD = dyn_cast_or_null<FunctionDecl>( 24401bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Call.getLValueBase().dyn_cast<const ValueDecl*>()); 244159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!FD) 2442f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 244359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 244459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Overloaded operator calls to member functions are represented as normal 244559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // calls with '*this' as the first argument. 244659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 244759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (MD && !MD->isStatic()) { 2448f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: When selecting an implicit conversion for an overloaded 2449f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // operator delete, we sometimes try to evaluate calls to conversion 2450f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // operators without a 'this' parameter! 2451f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Args.empty()) 2452f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2453f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 245459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!EvaluateObjectArgument(Info, Args[0], ThisVal)) 245559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return false; 245659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith This = &ThisVal; 245759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Args = Args.slice(1); 245859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 2459d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 246059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Don't call function pointers which have been cast to some other type. 246159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!Info.Ctx.hasSameType(CalleeType->getPointeeType(), FD->getType())) 2462f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 246359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } else 2464f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2465d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2466b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith if (This && !This->checkSubobject(Info, E, CSK_This)) 2467b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith return false; 2468b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith 2469c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Definition = 0; 2470d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith Stmt *Body = FD->getBody(Definition); 247169c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith APValue Result; 2472d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2473c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition) || 2474745f5147e065900267c85a5568785a1991d4838fRichard Smith !HandleFunctionCall(E->getExprLoc(), Definition, This, Args, Body, 2475745f5147e065900267c85a5568785a1991d4838fRichard Smith Info, Result)) 2476f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2477d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2478b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return DerivedSuccess(CCValue(Info.Ctx, Result, CCValue::GlobalValue()), E); 2479d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2480d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2481c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RetTy VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { 2482c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return StmtVisitorTy::Visit(E->getInitializer()); 2483c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2484f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitInitListExpr(const InitListExpr *E) { 248571523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman if (E->getNumInits() == 0) 248671523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman return DerivedZeroInitialization(E); 248771523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman if (E->getNumInits() == 1) 248871523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman return StmtVisitorTy::Visit(E->getInit(0)); 2489f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2490f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2491f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) { 249251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2493f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2494f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) { 249551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2496f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2497e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RetTy VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) { 249851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2499e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2500f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 2501180f47959a066795cc0f409433023af448bb0328Richard Smith /// A member expression where the object is a prvalue is itself a prvalue. 2502180f47959a066795cc0f409433023af448bb0328Richard Smith RetTy VisitMemberExpr(const MemberExpr *E) { 2503180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!E->isArrow() && "missing call to bound member function?"); 2504180f47959a066795cc0f409433023af448bb0328Richard Smith 2505180f47959a066795cc0f409433023af448bb0328Richard Smith CCValue Val; 2506180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Evaluate(Val, Info, E->getBase())) 2507180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2508180f47959a066795cc0f409433023af448bb0328Richard Smith 2509180f47959a066795cc0f409433023af448bb0328Richard Smith QualType BaseTy = E->getBase()->getType(); 2510180f47959a066795cc0f409433023af448bb0328Richard Smith 2511180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl()); 2512f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!FD) return Error(E); 2513180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!FD->getType()->isReferenceType() && "prvalue reference?"); 2514180f47959a066795cc0f409433023af448bb0328Richard Smith assert(BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() == 2515180f47959a066795cc0f409433023af448bb0328Richard Smith FD->getParent()->getCanonicalDecl() && "record / field mismatch"); 2516180f47959a066795cc0f409433023af448bb0328Richard Smith 2517b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator Designator(BaseTy); 2518b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addDeclUnchecked(FD); 2519180f47959a066795cc0f409433023af448bb0328Richard Smith 2520f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, E, Val, BaseTy, Designator, E->getType()) && 2521180f47959a066795cc0f409433023af448bb0328Richard Smith DerivedSuccess(Val, E); 2522180f47959a066795cc0f409433023af448bb0328Richard Smith } 2523180f47959a066795cc0f409433023af448bb0328Richard Smith 2524c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RetTy VisitCastExpr(const CastExpr *E) { 2525c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith switch (E->getCastKind()) { 2526c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith default: 2527c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith break; 2528c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 25297a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 25307a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 2531c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case CK_NoOp: 25327d580a4e9e47dffc3c17aa2b957ac57ca3c4e451Richard Smith case CK_UserDefinedConversion: 2533c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return StmtVisitorTy::Visit(E->getSubExpr()); 2534c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2535c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case CK_LValueToRValue: { 2536c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LValue LVal; 2537f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateLValue(E->getSubExpr(), LVal, Info)) 2538f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2539f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith CCValue RVal; 25409ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith // Note, we use the subexpression's type in order to retain cv-qualifiers. 25419ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getSubExpr()->getType(), 25429ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith LVal, RVal)) 2543f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2544f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return DerivedSuccess(RVal, E); 2545c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2546c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2547c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2548f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2549c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2550c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 25518327fad71da34492d82c532f42a58cb4baff81a3Richard Smith /// Visit a value which is evaluated, but whose value is ignored. 25528327fad71da34492d82c532f42a58cb4baff81a3Richard Smith void VisitIgnoredValue(const Expr *E) { 255347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue Scratch; 25548327fad71da34492d82c532f42a58cb4baff81a3Richard Smith if (!Evaluate(Scratch, Info, E)) 25558327fad71da34492d82c532f42a58cb4baff81a3Richard Smith Info.EvalStatus.HasSideEffects = true; 25568327fad71da34492d82c532f42a58cb4baff81a3Richard Smith } 25578cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne}; 25588cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 25598cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne} 25608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 25618cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne//===----------------------------------------------------------------------===// 2562e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Common base class for lvalue and temporary evaluation. 2563e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 2564e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 2565e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithtemplate<class Derived> 2566e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass LValueExprEvaluatorBase 2567e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public ExprEvaluatorBase<Derived, bool> { 2568e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithprotected: 2569e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &Result; 2570e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef LValueExprEvaluatorBase LValueExprEvaluatorBaseTy; 2571e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef ExprEvaluatorBase<Derived, bool> ExprEvaluatorBaseTy; 2572e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2573e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(APValue::LValueBase B) { 2574e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.set(B); 2575e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2576e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2577e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2578e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 2579e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBase(EvalInfo &Info, LValue &Result) : 2580e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ExprEvaluatorBaseTy(Info), Result(Result) {} 2581e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2582e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(const CCValue &V, const Expr *E) { 2583e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.setFrom(V); 2584e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2585e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2586e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2587e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitMemberExpr(const MemberExpr *E) { 2588e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Handle non-static data members. 2589e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType BaseTy; 2590e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isArrow()) { 2591e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluatePointer(E->getBase(), Result, this->Info)) 2592e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2593e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith BaseTy = E->getBase()->getType()->getAs<PointerType>()->getPointeeType(); 2594c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else if (E->getBase()->isRValue()) { 2595af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith assert(E->getBase()->getType()->isRecordType()); 2596c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!EvaluateTemporary(E->getBase(), Result, this->Info)) 2597c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 2598c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith BaseTy = E->getBase()->getType(); 2599e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else { 2600e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!this->Visit(E->getBase())) 2601e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2602e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith BaseTy = E->getBase()->getType(); 2603e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2604e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2605d9b02e726262e4009dda830998bb934172ac0020Richard Smith const ValueDecl *MD = E->getMemberDecl(); 2606d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl())) { 2607d9b02e726262e4009dda830998bb934172ac0020Richard Smith assert(BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() == 2608d9b02e726262e4009dda830998bb934172ac0020Richard Smith FD->getParent()->getCanonicalDecl() && "record / field mismatch"); 2609d9b02e726262e4009dda830998bb934172ac0020Richard Smith (void)BaseTy; 2610d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueMember(this->Info, E, Result, FD); 2611d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else if (const IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(MD)) { 2612d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueIndirectMember(this->Info, E, Result, IFD); 2613d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else 2614d9b02e726262e4009dda830998bb934172ac0020Richard Smith return this->Error(E); 2615e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2616d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (MD->getType()->isReferenceType()) { 2617e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith CCValue RefValue; 2618d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (!HandleLValueToRValueConversion(this->Info, E, MD->getType(), Result, 2619e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RefValue)) 2620e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2621e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success(RefValue, E); 2622e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2623e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2624e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2625e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2626e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitBinaryOperator(const BinaryOperator *E) { 2627e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getOpcode()) { 2628e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2629e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 2630e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2631e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemD: 2632e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemI: 2633e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleMemberPointerAccess(this->Info, E, Result); 2634e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2635e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2636e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2637e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E) { 2638e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 2639e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2640e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 2641e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2642e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_DerivedToBase: 2643e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_UncheckedDerivedToBase: { 2644e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!this->Visit(E->getSubExpr())) 2645e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2646e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2647e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Now figure out the necessary offset to add to the base LV to get from 2648e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // the derived class to the base class. 2649e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType Type = E->getSubExpr()->getType(); 2650e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2651e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 2652e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 2653b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleLValueBase(this->Info, E, Result, Type->getAsCXXRecordDecl(), 2654e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith *PathI)) 2655e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2656e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Type = (*PathI)->getType(); 2657e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2658e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2659e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2660e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2661e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2662e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2663e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 2664e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 2665e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2666e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 26674efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman// LValue Evaluation 2668c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 2669c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// This is used for evaluating lvalues (in C and C++), xvalues (in C++11), 2670c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// function designators (in C), decl references to void objects (in C), and 2671c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// temporaries (if building with -Wno-address-of-temporary). 2672c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 2673c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// LValue evaluation produces values comprising a base expression of one of the 2674c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// following types: 26751bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Declarations 26761bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * VarDecl 26771bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * FunctionDecl 26781bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Literals 2679c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * CompoundLiteralExpr in C 2680c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * StringLiteral 268147d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith// * CXXTypeidExpr 2682c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * PredefinedExpr 2683180f47959a066795cc0f409433023af448bb0328Richard Smith// * ObjCStringLiteralExpr 2684c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * ObjCEncodeExpr 2685c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * AddrLabelExpr 2686c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * BlockExpr 2687c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * CallExpr for a MakeStringConstant builtin 26881bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Locals and temporaries 26891bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * Any Expr, with a Frame indicating the function in which the temporary was 26901bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// evaluated. 26911bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// plus an offset in bytes. 26924efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 26934efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedmannamespace { 2694770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass LValueExprEvaluator 2695e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public LValueExprEvaluatorBase<LValueExprEvaluator> { 26964efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedmanpublic: 2697e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluator(EvalInfo &Info, LValue &Result) : 2698e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBaseTy(Info, Result) {} 26991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2700c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith bool VisitVarDecl(const Expr *E, const VarDecl *VD); 2701c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 27028cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitDeclRefExpr(const DeclRefExpr *E); 27038cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitPredefinedExpr(const PredefinedExpr *E) { return Success(E); } 2704bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith bool VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E); 27058cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E); 27068cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitMemberExpr(const MemberExpr *E); 27078cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStringLiteral(const StringLiteral *E) { return Success(E); } 27088cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitObjCEncodeExpr(const ObjCEncodeExpr *E) { return Success(E); } 270947d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith bool VisitCXXTypeidExpr(const CXXTypeidExpr *E); 27108cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E); 27118cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryDeref(const UnaryOperator *E); 27128cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 27138cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E) { 271426bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson switch (E->getCastKind()) { 271526bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson default: 2716e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitCastExpr(E); 271726bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson 2718db924224b51b153f24fbe492102d4edebcbbb7f4Eli Friedman case CK_LValueBitCast: 2719c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith this->CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 27200a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (!Visit(E->getSubExpr())) 27210a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 27220a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Result.Designator.setInvalid(); 27230a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 2724db924224b51b153f24fbe492102d4edebcbbb7f4Eli Friedman 2725e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerived: 2726180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Visit(E->getSubExpr())) 2727180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2728e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleBaseToDerivedCast(Info, E, Result); 272926bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson } 273026bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson } 2731cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 2732ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman // FIXME: Missing: __real__, __imag__ 27338cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 27344efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman}; 27354efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} // end anonymous namespace 27364efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 2737c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// Evaluate an expression as an lvalue. This can be legitimately called on 2738c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// expressions which are not glvalues, in a few cases: 2739c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * function designators in C, 2740c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * "extern void" objects, 2741c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * temporaries, if building with -Wno-address-of-temporary. 2742efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluateLValue(const Expr* E, LValue& Result, EvalInfo &Info) { 2743c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert((E->isGLValue() || E->getType()->isFunctionType() || 2744c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith E->getType()->isVoidType() || isa<CXXTemporaryObjectExpr>(E)) && 2745c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith "can't evaluate expression as an lvalue"); 27468cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return LValueExprEvaluator(Info, Result).Visit(E); 27474efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 27484efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 27498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitDeclRefExpr(const DeclRefExpr *E) { 27501bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(E->getDecl())) 27511bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(FD); 27521bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(E->getDecl())) 2753c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return VisitVarDecl(E, VD); 2754c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Error(E); 2755c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 2756436c8898cd1c93c5bacd3fcc4ac586bc5cd77062Richard Smith 2757c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithbool LValueExprEvaluator::VisitVarDecl(const Expr *E, const VarDecl *VD) { 2758177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (!VD->getType()->isReferenceType()) { 2759177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (isa<ParmVarDecl>(VD)) { 27601bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.set(VD, Info.CurrentCall); 2761177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return true; 2762177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith } 27631bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(VD); 2764177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith } 276550c39ea4858265f3f5f42a0c624557ce2281936bEli Friedman 276647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue V; 2767f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateVarDeclInit(Info, E, VD, Info.CurrentCall, V)) 2768f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2769f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(V, E); 277035873c49adad211ff466e34342a52665742794f5Anders Carlsson} 277135873c49adad211ff466e34342a52665742794f5Anders Carlsson 2772bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smithbool LValueExprEvaluator::VisitMaterializeTemporaryExpr( 2773bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith const MaterializeTemporaryExpr *E) { 2774e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->GetTemporaryExpr()->isRValue()) { 2775af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith if (E->getType()->isRecordType()) 2776e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateTemporary(E->GetTemporaryExpr(), Result, Info); 2777e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2778e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.set(E, Info.CurrentCall); 2779e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateConstantExpression(Info.CurrentCall->Temporaries[E], Info, 2780e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result, E->GetTemporaryExpr()); 2781e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2782e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2783e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Materialization of an lvalue temporary occurs when we need to force a copy 2784e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // (for instance, if it's a bitfield). 2785e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // FIXME: The AST should contain an lvalue-to-rvalue node for such cases. 2786e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->GetTemporaryExpr())) 2787e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2788f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), Result, 2789e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Info.CurrentCall->Temporaries[E])) 2790e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 27911bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.set(E, Info.CurrentCall); 2792e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2793bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith} 2794bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 27958cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool 27968cad3046be06ea73ff8892d947697a21d7a440d3Peter CollingbourneLValueExprEvaluator::VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { 2797c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(!Info.getLangOpts().CPlusPlus && "lvalue compound literal in c++?"); 2798c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // Defer visiting the literal until the lvalue-to-rvalue conversion. We can 2799c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // only see this when folding in C, so there's no standard to follow here. 2800efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 28014efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 28024efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 280347d2145675099893d702be4bc06bd9f26d8ddd13Richard Smithbool LValueExprEvaluator::VisitCXXTypeidExpr(const CXXTypeidExpr *E) { 280447d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith if (E->isTypeOperand()) 280547d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return Success(E); 280647d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith CXXRecordDecl *RD = E->getExprOperand()->getType()->getAsCXXRecordDecl(); 280747d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith if (RD && RD->isPolymorphic()) { 280847d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_typeid_polymorphic) 280947d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith << E->getExprOperand()->getType() 281047d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith << E->getExprOperand()->getSourceRange(); 281147d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return false; 281247d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith } 281347d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return Success(E); 281447d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith} 281547d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith 28168cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitMemberExpr(const MemberExpr *E) { 2817c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // Handle static data members. 2818c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(E->getMemberDecl())) { 2819c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith VisitIgnoredValue(E->getBase()); 2820c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return VisitVarDecl(E, VD); 2821c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2822c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2823d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // Handle static member functions. 2824d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(E->getMemberDecl())) { 2825d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (MD->isStatic()) { 2826d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith VisitIgnoredValue(E->getBase()); 28271bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(MD); 2828d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2829d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2830d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2831180f47959a066795cc0f409433023af448bb0328Richard Smith // Handle non-static data members. 2832e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitMemberExpr(E); 28334efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 28344efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 28358cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitArraySubscriptExpr(const ArraySubscriptExpr *E) { 2836c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // FIXME: Deal with vectors as array subscript bases. 2837c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->getBase()->getType()->isVectorType()) 2838f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2839c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 28403068d117951a8df54bae9db039b56201ab10962bAnders Carlsson if (!EvaluatePointer(E->getBase(), Result, Info)) 2841efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 28421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 28433068d117951a8df54bae9db039b56201ab10962bAnders Carlsson APSInt Index; 28443068d117951a8df54bae9db039b56201ab10962bAnders Carlsson if (!EvaluateInteger(E->getIdx(), Index, Info)) 2845efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 2846180f47959a066795cc0f409433023af448bb0328Richard Smith int64_t IndexValue 2847180f47959a066795cc0f409433023af448bb0328Richard Smith = Index.isSigned() ? Index.getSExtValue() 2848180f47959a066795cc0f409433023af448bb0328Richard Smith : static_cast<int64_t>(Index.getZExtValue()); 28493068d117951a8df54bae9db039b56201ab10962bAnders Carlsson 2850b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleLValueArrayAdjustment(Info, E, Result, E->getType(), IndexValue); 28513068d117951a8df54bae9db039b56201ab10962bAnders Carlsson} 28524efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 28538cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitUnaryDeref(const UnaryOperator *E) { 2854efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return EvaluatePointer(E->getSubExpr(), Result, Info); 2855e8761c8fe2ee6b628104a0885f49fd3c21c08a4fEli Friedman} 2856e8761c8fe2ee6b628104a0885f49fd3c21c08a4fEli Friedman 28574efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 2858f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner// Pointer Evaluation 2859f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 2860f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 2861c754aa62643e66ab967ca32ae8b0b3fc419bba25Anders Carlssonnamespace { 2862770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass PointerExprEvaluator 28638cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<PointerExprEvaluator, bool> { 2864efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue &Result; 2865efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 28668cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool Success(const Expr *E) { 28671bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.set(E); 2868efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 2869efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } 28702bad1687fe6f00e10767a691a33b070b151902b6Anders Carlssonpublic: 28711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2872efdb83e26f9a1fd2566afe54461216cd84814d42John McCall PointerExprEvaluator(EvalInfo &info, LValue &Result) 28738cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(Result) {} 2874f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 287547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith bool Success(const CCValue &V, const Expr *E) { 28768cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result.setFrom(V); 28778cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 28782bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson } 287951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 2880f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith return Success((Expr*)0); 2881f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 28822bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 2883efdb83e26f9a1fd2566afe54461216cd84814d42John McCall bool VisitBinaryOperator(const BinaryOperator *E); 28848cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr* E); 2885efdb83e26f9a1fd2566afe54461216cd84814d42John McCall bool VisitUnaryAddrOf(const UnaryOperator *E); 28868cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitObjCStringLiteral(const ObjCStringLiteral *E) 2887efdb83e26f9a1fd2566afe54461216cd84814d42John McCall { return Success(E); } 28888cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitAddrLabelExpr(const AddrLabelExpr *E) 2889efdb83e26f9a1fd2566afe54461216cd84814d42John McCall { return Success(E); } 28908cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCallExpr(const CallExpr *E); 28918cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBlockExpr(const BlockExpr *E) { 2892469a1eb996e1cb0be54f9b210f836afbddcbb2ccJohn McCall if (!E->getBlockDecl()->hasCaptures()) 2893efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 2894f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2895b83d287bc7f47d36fb0751a481e2ef9308b37252Mike Stump } 2896180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitCXXThisExpr(const CXXThisExpr *E) { 2897180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Info.CurrentCall->This) 2898f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2899180f47959a066795cc0f409433023af448bb0328Richard Smith Result = *Info.CurrentCall->This; 2900180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 2901180f47959a066795cc0f409433023af448bb0328Richard Smith } 290256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 2903ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman // FIXME: Missing: @protocol, @selector 29042bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson}; 2905f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} // end anonymous namespace 29062bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 2907efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluatePointer(const Expr* E, LValue& Result, EvalInfo &Info) { 2908c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->hasPointerRepresentation()); 29098cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return PointerExprEvaluator(Info, Result).Visit(E); 2910f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} 2911650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 2912efdb83e26f9a1fd2566afe54461216cd84814d42John McCallbool PointerExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 29132de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() != BO_Add && 29142de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall E->getOpcode() != BO_Sub) 2915e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 29161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2917650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson const Expr *PExp = E->getLHS(); 2918650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson const Expr *IExp = E->getRHS(); 2919650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson if (IExp->getType()->isPointerType()) 2920f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner std::swap(PExp, IExp); 29211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2922745f5147e065900267c85a5568785a1991d4838fRichard Smith bool EvalPtrOK = EvaluatePointer(PExp, Result, Info); 2923745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalPtrOK && !Info.keepEvaluatingAfterFailure()) 2924efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 29251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2926efdb83e26f9a1fd2566afe54461216cd84814d42John McCall llvm::APSInt Offset; 2927745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateInteger(IExp, Offset, Info) || !EvalPtrOK) 2928efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 2929efdb83e26f9a1fd2566afe54461216cd84814d42John McCall int64_t AdditionalOffset 2930efdb83e26f9a1fd2566afe54461216cd84814d42John McCall = Offset.isSigned() ? Offset.getSExtValue() 2931efdb83e26f9a1fd2566afe54461216cd84814d42John McCall : static_cast<int64_t>(Offset.getZExtValue()); 29320a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (E->getOpcode() == BO_Sub) 29330a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith AdditionalOffset = -AdditionalOffset; 2934650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 2935180f47959a066795cc0f409433023af448bb0328Richard Smith QualType Pointee = PExp->getType()->getAs<PointerType>()->getPointeeType(); 2936b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleLValueArrayAdjustment(Info, E, Result, Pointee, 2937b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith AdditionalOffset); 2938650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson} 29394efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 2940efdb83e26f9a1fd2566afe54461216cd84814d42John McCallbool PointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { 2941efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return EvaluateLValue(E->getSubExpr(), Result, Info); 29424efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 29431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 29448cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool PointerExprEvaluator::VisitCastExpr(const CastExpr* E) { 29458cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 2946650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 294709a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman switch (E->getCastKind()) { 294809a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman default: 294909a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman break; 295009a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman 29512de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_BitCast: 29521d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 29531d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 29542de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_AnyPointerToBlockPointerCast: 295528c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith if (!Visit(SubExpr)) 295628c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith return false; 2957c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // Bitcasts to cv void* are static_casts, not reinterpret_casts, so are 2958c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // permitted in constant expressions in C++11. Bitcasts from cv void* are 2959c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // also static_casts, but we disallow them as a resolution to DR1312. 29604cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith if (!E->getType()->isVoidPointerType()) { 296128c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith Result.Designator.setInvalid(); 29624cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith if (SubExpr->getType()->isVoidPointerType()) 29634cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) 29644cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith << 3 << SubExpr->getType(); 29654cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith else 29664cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 29674cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith } 29680a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 296909a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman 29705c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson case CK_DerivedToBase: 29715c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson case CK_UncheckedDerivedToBase: { 297247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith if (!EvaluatePointer(E->getSubExpr(), Result, Info)) 29735c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return false; 2974e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.Base && Result.Offset.isZero()) 2975e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 29765c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 2977180f47959a066795cc0f409433023af448bb0328Richard Smith // Now figure out the necessary offset to add to the base LV to get from 29785c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson // the derived class to the base class. 2979180f47959a066795cc0f409433023af448bb0328Richard Smith QualType Type = 2980180f47959a066795cc0f409433023af448bb0328Richard Smith E->getSubExpr()->getType()->castAs<PointerType>()->getPointeeType(); 29815c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 2982180f47959a066795cc0f409433023af448bb0328Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 29835c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson PathE = E->path_end(); PathI != PathE; ++PathI) { 2984b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleLValueBase(Info, E, Result, Type->getAsCXXRecordDecl(), 2985b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith *PathI)) 29865c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return false; 2987180f47959a066795cc0f409433023af448bb0328Richard Smith Type = (*PathI)->getType(); 29885c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson } 29895c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 29905c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return true; 29915c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson } 29925c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 2993e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerived: 2994e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 2995e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2996e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.Base && Result.Offset.isZero()) 2997e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2998e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleBaseToDerivedCast(Info, E, Result); 2999e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 300047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith case CK_NullToPointer: 300151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 3002404cd1669c3ba138a9ae0a619bd689cce5aae271John McCall 30032de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_IntegralToPointer: { 3004c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 3005c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 300647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue Value; 3007efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateIntegerOrLValue(SubExpr, Value, Info)) 300809a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman break; 300969ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar 3010efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (Value.isInt()) { 301147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith unsigned Size = Info.Ctx.getTypeSize(E->getType()); 301247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith uint64_t N = Value.getInt().extOrTrunc(Size).getZExtValue(); 30131bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.Base = (Expr*)0; 301447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result.Offset = CharUnits::fromQuantity(N); 3015177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith Result.Frame = 0; 30160a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Result.Designator.setInvalid(); 3017efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 3018efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else { 3019efdb83e26f9a1fd2566afe54461216cd84814d42John McCall // Cast is of an lvalue, no need to change value. 302047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result.setFrom(Value); 3021efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 3022650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson } 3023650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson } 30242de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_ArrayToPointerDecay: 3025e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (SubExpr->isGLValue()) { 3026e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateLValue(SubExpr, Result, Info)) 3027e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3028e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else { 3029e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.set(SubExpr, Info.CurrentCall); 3030e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateConstantExpression(Info.CurrentCall->Temporaries[SubExpr], 3031e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Info, Result, SubExpr)) 3032e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3033e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 30340a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith // The result is a pointer to the first element of the array. 3035b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (const ConstantArrayType *CAT 3036b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith = Info.Ctx.getAsConstantArrayType(SubExpr->getType())) 3037b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result.addArray(Info, E, CAT); 3038b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 3039b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result.Designator.setInvalid(); 30400a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 30416a7c94af983717e2c2d6aebe42cb4737c1c7b9e6Richard Smith 30422de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_FunctionToPointerDecay: 30436a7c94af983717e2c2d6aebe42cb4737c1c7b9e6Richard Smith return EvaluateLValue(SubExpr, Result, Info); 30444efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 30454efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 3046c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 30471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump} 3048650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 30498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool PointerExprEvaluator::VisitCallExpr(const CallExpr *E) { 3050180f47959a066795cc0f409433023af448bb0328Richard Smith if (IsStringLiteralCall(E)) 3051efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 305256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 30538cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 30544efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 3055f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3056f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 3057e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Member Pointer Evaluation 3058e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3059e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3060e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 3061e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass MemberPointerExprEvaluator 3062e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public ExprEvaluatorBase<MemberPointerExprEvaluator, bool> { 3063e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr &Result; 3064e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3065e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(const ValueDecl *D) { 3066e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = MemberPtr(D); 3067e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3068e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3069e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 3070e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3071e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPointerExprEvaluator(EvalInfo &Info, MemberPtr &Result) 3072e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : ExprEvaluatorBaseTy(Info), Result(Result) {} 3073e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3074e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(const CCValue &V, const Expr *E) { 3075e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.setFrom(V); 3076e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3077e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 307851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3079e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success((const ValueDecl*)0); 3080e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3081e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3082e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E); 3083e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitUnaryAddrOf(const UnaryOperator *E); 3084e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 3085e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} // end anonymous namespace 3086e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3087e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, 3088e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith EvalInfo &Info) { 3089e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(E->isRValue() && E->getType()->isMemberPointerType()); 3090e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return MemberPointerExprEvaluator(Info, Result).Visit(E); 3091e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3092e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3093e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool MemberPointerExprEvaluator::VisitCastExpr(const CastExpr *E) { 3094e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 3095e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 3096e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 3097e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3098e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_NullToMemberPointer: 309951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 3100e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3101e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerivedMemberPointer: { 3102e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3103e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3104e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->path_empty()) 3105e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3106e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Base-to-derived member pointer casts store the path in derived-to-base 3107e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // order, so iterate backwards. The CXXBaseSpecifier also provides us with 3108e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // the wrong end of the derived->base arc, so stagger the path by one class. 3109e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef std::reverse_iterator<CastExpr::path_const_iterator> ReverseIter; 3110e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (ReverseIter PathI(E->path_end() - 1), PathE(E->path_begin()); 3111e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathI != PathE; ++PathI) { 3112e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!(*PathI)->isVirtual() && "memptr cast through vbase"); 3113e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Derived = (*PathI)->getType()->getAsCXXRecordDecl(); 3114e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToDerived(Derived)) 3115f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3116e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3117e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const Type *FinalTy = E->getType()->castAs<MemberPointerType>()->getClass(); 3118e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToDerived(FinalTy->getAsCXXRecordDecl())) 3119f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3120e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3121e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3122e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3123e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_DerivedToBaseMemberPointer: 3124e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3125e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3126e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 3127e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 3128e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!(*PathI)->isVirtual() && "memptr cast through vbase"); 3129e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); 3130e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToBase(Base)) 3131f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3132e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3133e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3134e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3135e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3136e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3137e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool MemberPointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { 3138e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.unary.op]p3 has very strict rules on how the address of a 3139e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // member can be formed. 3140e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success(cast<DeclRefExpr>(E->getSubExpr())->getDecl()); 3141e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3142e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3143e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3144180f47959a066795cc0f409433023af448bb0328Richard Smith// Record Evaluation 3145180f47959a066795cc0f409433023af448bb0328Richard Smith//===----------------------------------------------------------------------===// 3146180f47959a066795cc0f409433023af448bb0328Richard Smith 3147180f47959a066795cc0f409433023af448bb0328Richard Smithnamespace { 3148180f47959a066795cc0f409433023af448bb0328Richard Smith class RecordExprEvaluator 3149180f47959a066795cc0f409433023af448bb0328Richard Smith : public ExprEvaluatorBase<RecordExprEvaluator, bool> { 3150180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue &This; 3151180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result; 3152180f47959a066795cc0f409433023af448bb0328Richard Smith public: 3153180f47959a066795cc0f409433023af448bb0328Richard Smith 3154180f47959a066795cc0f409433023af448bb0328Richard Smith RecordExprEvaluator(EvalInfo &info, const LValue &This, APValue &Result) 3155180f47959a066795cc0f409433023af448bb0328Richard Smith : ExprEvaluatorBaseTy(info), This(This), Result(Result) {} 3156180f47959a066795cc0f409433023af448bb0328Richard Smith 3157180f47959a066795cc0f409433023af448bb0328Richard Smith bool Success(const CCValue &V, const Expr *E) { 3158f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return CheckConstantExpression(Info, E, V, Result); 3159180f47959a066795cc0f409433023af448bb0328Richard Smith } 316051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E); 3161180f47959a066795cc0f409433023af448bb0328Richard Smith 316259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith bool VisitCastExpr(const CastExpr *E); 3163180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitInitListExpr(const InitListExpr *E); 3164180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E); 3165180f47959a066795cc0f409433023af448bb0328Richard Smith }; 3166180f47959a066795cc0f409433023af448bb0328Richard Smith} 3167180f47959a066795cc0f409433023af448bb0328Richard Smith 316851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// Perform zero-initialization on an object of non-union class type. 316951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// C++11 [dcl.init]p5: 317051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// To zero-initialize an object or reference of type T means: 317151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// [...] 317251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// -- if T is a (possibly cv-qualified) non-union class type, 317351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// each non-static data member and each base-class subobject is 317451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// zero-initialized 3175b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleClassZeroInitialization(EvalInfo &Info, const Expr *E, 3176b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const RecordDecl *RD, 317751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const LValue &This, APValue &Result) { 317851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith assert(!RD->isUnion() && "Expected non-union class type"); 317951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD); 318051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue(APValue::UninitStruct(), CD ? CD->getNumBases() : 0, 318151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith std::distance(RD->field_begin(), RD->field_end())); 318251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 318351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 318451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 318551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CD) { 318651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith unsigned Index = 0; 318751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith for (CXXRecordDecl::base_class_const_iterator I = CD->bases_begin(), 3188b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith End = CD->bases_end(); I != End; ++I, ++Index) { 318951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 319051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3191b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, E, Subobject, CD, Base, &Layout); 3192b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleClassZeroInitialization(Info, E, Base, Subobject, 319351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result.getStructBase(Index))) 319451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 319551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 319651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 319751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3198b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith for (RecordDecl::field_iterator I = RD->field_begin(), End = RD->field_end(); 3199b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith I != End; ++I) { 320051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // -- if T is a reference type, no initialization is performed. 320151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if ((*I)->getType()->isReferenceType()) 320251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith continue; 320351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 320451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3205b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, E, Subobject, *I, &Layout); 320651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 320751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE((*I)->getType()); 320851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!EvaluateConstantExpression( 320951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result.getStructField((*I)->getFieldIndex()), Info, Subobject, &VIE)) 321051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 321151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 321251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 321351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 321451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 321551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 321651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smithbool RecordExprEvaluator::ZeroInitialization(const Expr *E) { 321751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl(); 321851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (RD->isUnion()) { 321951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // C++11 [dcl.init]p5: If T is a (possibly cv-qualified) union type, the 322051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // object's first non-static named data member is zero-initialized 322151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RecordDecl::field_iterator I = RD->field_begin(); 322251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (I == RD->field_end()) { 322351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue((const FieldDecl*)0); 322451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 322551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 322651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 322751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3228b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, E, Subobject, *I); 322951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue(*I); 323051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE((*I)->getType()); 323151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return EvaluateConstantExpression(Result.getUnionValue(), Info, 323251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Subobject, &VIE); 323351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 323451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3235b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleClassZeroInitialization(Info, E, RD, This, Result); 323651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 323751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 323859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithbool RecordExprEvaluator::VisitCastExpr(const CastExpr *E) { 323959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith switch (E->getCastKind()) { 324059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith default: 324159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 324259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 324359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_ConstructorConversion: 324459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return Visit(E->getSubExpr()); 324559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 324659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_DerivedToBase: 324759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_UncheckedDerivedToBase: { 324859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith CCValue DerivedObject; 3249f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Evaluate(DerivedObject, Info, E->getSubExpr())) 325059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return false; 3251f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!DerivedObject.isStruct()) 3252f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E->getSubExpr()); 325359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 325459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Derived-to-base rvalue conversion: just slice off the derived part. 325559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith APValue *Value = &DerivedObject; 325659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *RD = E->getSubExpr()->getType()->getAsCXXRecordDecl(); 325759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 325859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 325959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith assert(!(*PathI)->isVirtual() && "record rvalue with virtual base"); 326059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); 326159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Value = &Value->getStructBase(getBaseIndex(RD, Base)); 326259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith RD = Base; 326359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 326459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Result = *Value; 326559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return true; 326659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 326759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 326859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 326959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3270180f47959a066795cc0f409433023af448bb0328Richard Smithbool RecordExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 3271180f47959a066795cc0f409433023af448bb0328Richard Smith const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl(); 3272180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 3273180f47959a066795cc0f409433023af448bb0328Richard Smith 3274180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 3275ec789163a42a7be654ac34aadb750b508954d53cRichard Smith const FieldDecl *Field = E->getInitializedFieldInUnion(); 3276ec789163a42a7be654ac34aadb750b508954d53cRichard Smith Result = APValue(Field); 3277ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!Field) 3278180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 3279ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 3280ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // If the initializer list for a union does not contain any elements, the 3281ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // first element of the union is value-initialized. 3282ec789163a42a7be654ac34aadb750b508954d53cRichard Smith ImplicitValueInitExpr VIE(Field->getType()); 3283ec789163a42a7be654ac34aadb750b508954d53cRichard Smith const Expr *InitExpr = E->getNumInits() ? E->getInit(0) : &VIE; 3284ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 3285180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3286ec789163a42a7be654ac34aadb750b508954d53cRichard Smith HandleLValueMember(Info, InitExpr, Subobject, Field, &Layout); 3287180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateConstantExpression(Result.getUnionValue(), Info, 3288ec789163a42a7be654ac34aadb750b508954d53cRichard Smith Subobject, InitExpr); 3289180f47959a066795cc0f409433023af448bb0328Richard Smith } 3290180f47959a066795cc0f409433023af448bb0328Richard Smith 3291180f47959a066795cc0f409433023af448bb0328Richard Smith assert((!isa<CXXRecordDecl>(RD) || !cast<CXXRecordDecl>(RD)->getNumBases()) && 3292180f47959a066795cc0f409433023af448bb0328Richard Smith "initializer list for class with base classes"); 3293180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitStruct(), 0, 3294180f47959a066795cc0f409433023af448bb0328Richard Smith std::distance(RD->field_begin(), RD->field_end())); 3295180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned ElementNo = 0; 3296745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 3297180f47959a066795cc0f409433023af448bb0328Richard Smith for (RecordDecl::field_iterator Field = RD->field_begin(), 3298180f47959a066795cc0f409433023af448bb0328Richard Smith FieldEnd = RD->field_end(); Field != FieldEnd; ++Field) { 3299180f47959a066795cc0f409433023af448bb0328Richard Smith // Anonymous bit-fields are not considered members of the class for 3300180f47959a066795cc0f409433023af448bb0328Richard Smith // purposes of aggregate initialization. 3301180f47959a066795cc0f409433023af448bb0328Richard Smith if (Field->isUnnamedBitfield()) 3302180f47959a066795cc0f409433023af448bb0328Richard Smith continue; 3303180f47959a066795cc0f409433023af448bb0328Richard Smith 3304180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3305180f47959a066795cc0f409433023af448bb0328Richard Smith 3306745f5147e065900267c85a5568785a1991d4838fRichard Smith bool HaveInit = ElementNo < E->getNumInits(); 3307745f5147e065900267c85a5568785a1991d4838fRichard Smith 3308745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: Diagnostics here should point to the end of the initializer 3309745f5147e065900267c85a5568785a1991d4838fRichard Smith // list, not the start. 3310745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleLValueMember(Info, HaveInit ? E->getInit(ElementNo) : E, Subobject, 3311745f5147e065900267c85a5568785a1991d4838fRichard Smith *Field, &Layout); 3312745f5147e065900267c85a5568785a1991d4838fRichard Smith 3313745f5147e065900267c85a5568785a1991d4838fRichard Smith // Perform an implicit value-initialization for members beyond the end of 3314745f5147e065900267c85a5568785a1991d4838fRichard Smith // the initializer list. 3315745f5147e065900267c85a5568785a1991d4838fRichard Smith ImplicitValueInitExpr VIE(HaveInit ? Info.Ctx.IntTy : Field->getType()); 3316745f5147e065900267c85a5568785a1991d4838fRichard Smith 3317745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateConstantExpression( 3318745f5147e065900267c85a5568785a1991d4838fRichard Smith Result.getStructField((*Field)->getFieldIndex()), 3319745f5147e065900267c85a5568785a1991d4838fRichard Smith Info, Subobject, HaveInit ? E->getInit(ElementNo++) : &VIE)) { 3320745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 3321180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 3322745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 3323180f47959a066795cc0f409433023af448bb0328Richard Smith } 3324180f47959a066795cc0f409433023af448bb0328Richard Smith } 3325180f47959a066795cc0f409433023af448bb0328Richard Smith 3326745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 3327180f47959a066795cc0f409433023af448bb0328Richard Smith} 3328180f47959a066795cc0f409433023af448bb0328Richard Smith 3329180f47959a066795cc0f409433023af448bb0328Richard Smithbool RecordExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) { 3330180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXConstructorDecl *FD = E->getConstructor(); 333151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInit = E->requiresZeroInitialization(); 333251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) { 3333ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // If we've already performed zero-initialization, we're already done. 3334ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!Result.isUninit()) 3335ec789163a42a7be654ac34aadb750b508954d53cRichard Smith return true; 3336ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 333751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit) 333851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 333951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 33406180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith const CXXRecordDecl *RD = FD->getParent(); 33416180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (RD->isUnion()) 33426180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result = APValue((FieldDecl*)0); 33436180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith else 33446180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result = APValue(APValue::UninitStruct(), RD->getNumBases(), 33456180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith std::distance(RD->field_begin(), RD->field_end())); 33466180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 33476180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 33486180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 3349180f47959a066795cc0f409433023af448bb0328Richard Smith const FunctionDecl *Definition = 0; 3350180f47959a066795cc0f409433023af448bb0328Richard Smith FD->getBody(Definition); 3351180f47959a066795cc0f409433023af448bb0328Richard Smith 3352c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition)) 3353c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 3354180f47959a066795cc0f409433023af448bb0328Richard Smith 3355610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // Avoid materializing a temporary for an elidable copy/move constructor. 335651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (E->isElidable() && !ZeroInit) 3357180f47959a066795cc0f409433023af448bb0328Richard Smith if (const MaterializeTemporaryExpr *ME 3358180f47959a066795cc0f409433023af448bb0328Richard Smith = dyn_cast<MaterializeTemporaryExpr>(E->getArg(0))) 3359180f47959a066795cc0f409433023af448bb0328Richard Smith return Visit(ME->GetTemporaryExpr()); 3360180f47959a066795cc0f409433023af448bb0328Richard Smith 336151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit && !ZeroInitialization(E)) 336251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 336351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3364180f47959a066795cc0f409433023af448bb0328Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 3365745f5147e065900267c85a5568785a1991d4838fRichard Smith return HandleConstructorCall(E->getExprLoc(), This, Args, 3366f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith cast<CXXConstructorDecl>(Definition), Info, 3367f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Result); 3368180f47959a066795cc0f409433023af448bb0328Richard Smith} 3369180f47959a066795cc0f409433023af448bb0328Richard Smith 3370180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateRecord(const Expr *E, const LValue &This, 3371180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result, EvalInfo &Info) { 3372180f47959a066795cc0f409433023af448bb0328Richard Smith assert(E->isRValue() && E->getType()->isRecordType() && 3373180f47959a066795cc0f409433023af448bb0328Richard Smith "can't evaluate expression as a record rvalue"); 3374180f47959a066795cc0f409433023af448bb0328Richard Smith return RecordExprEvaluator(Info, This, Result).Visit(E); 3375180f47959a066795cc0f409433023af448bb0328Richard Smith} 3376180f47959a066795cc0f409433023af448bb0328Richard Smith 3377180f47959a066795cc0f409433023af448bb0328Richard Smith//===----------------------------------------------------------------------===// 3378e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Temporary Evaluation 3379e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// 3380e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Temporaries are represented in the AST as rvalues, but generally behave like 3381e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// lvalues. The full-object of which the temporary is a subobject is implicitly 3382e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// materialized so that a reference can bind to it. 3383e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3384e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 3385e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass TemporaryExprEvaluator 3386e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public LValueExprEvaluatorBase<TemporaryExprEvaluator> { 3387e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 3388e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith TemporaryExprEvaluator(EvalInfo &Info, LValue &Result) : 3389e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBaseTy(Info, Result) {} 3390e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3391e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Visit an expression which constructs the value of this temporary. 3392e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitConstructExpr(const Expr *E) { 3393e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.set(E, Info.CurrentCall); 3394e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateConstantExpression(Info.CurrentCall->Temporaries[E], Info, 3395e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result, E); 3396e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3397e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3398e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E) { 3399e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 3400e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 3401e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitCastExpr(E); 3402e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3403e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_ConstructorConversion: 3404e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E->getSubExpr()); 3405e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3406e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3407e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitInitListExpr(const InitListExpr *E) { 3408e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3409e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3410e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E) { 3411e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3412e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3413e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCallExpr(const CallExpr *E) { 3414e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3415e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3416e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 3417e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} // end anonymous namespace 3418e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3419e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// Evaluate an expression of record type as a temporary. 3420e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info) { 3421af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith assert(E->isRValue() && E->getType()->isRecordType()); 3422e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return TemporaryExprEvaluator(Info, Result).Visit(E); 3423e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3424e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3425e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 342659b5da6d853b4368b984700315adf7b37de05764Nate Begeman// Vector Evaluation 342759b5da6d853b4368b984700315adf7b37de05764Nate Begeman//===----------------------------------------------------------------------===// 342859b5da6d853b4368b984700315adf7b37de05764Nate Begeman 342959b5da6d853b4368b984700315adf7b37de05764Nate Begemannamespace { 3430770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramer class VectorExprEvaluator 343107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith : public ExprEvaluatorBase<VectorExprEvaluator, bool> { 343207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith APValue &Result; 343359b5da6d853b4368b984700315adf7b37de05764Nate Begeman public: 34341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 343507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith VectorExprEvaluator(EvalInfo &info, APValue &Result) 343607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith : ExprEvaluatorBaseTy(info), Result(Result) {} 34371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 343807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool Success(const ArrayRef<APValue> &V, const Expr *E) { 343907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith assert(V.size() == E->getType()->castAs<VectorType>()->getNumElements()); 344007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith // FIXME: remove this APValue copy. 344107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Result = APValue(V.data(), V.size()); 344207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return true; 344307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith } 344469c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith bool Success(const CCValue &V, const Expr *E) { 344569c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith assert(V.isVector()); 344607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Result = V; 344707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return true; 344807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith } 344951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E); 34501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 345107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitUnaryReal(const UnaryOperator *E) 345291110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman { return Visit(E->getSubExpr()); } 345307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitCastExpr(const CastExpr* E); 345407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitInitListExpr(const InitListExpr *E); 345507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitUnaryImag(const UnaryOperator *E); 345691110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman // FIXME: Missing: unary -, unary ~, binary add/sub/mul/div, 34572217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman // binary comparisons, binary and/or/xor, 345891110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman // shufflevector, ExtVectorElementExpr 345959b5da6d853b4368b984700315adf7b37de05764Nate Begeman }; 346059b5da6d853b4368b984700315adf7b37de05764Nate Begeman} // end anonymous namespace 346159b5da6d853b4368b984700315adf7b37de05764Nate Begeman 346259b5da6d853b4368b984700315adf7b37de05764Nate Begemanstatic bool EvaluateVector(const Expr* E, APValue& Result, EvalInfo &Info) { 3463c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isVectorType() &&"not a vector rvalue"); 346407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return VectorExprEvaluator(Info, Result).Visit(E); 346559b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 346659b5da6d853b4368b984700315adf7b37de05764Nate Begeman 346707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool VectorExprEvaluator::VisitCastExpr(const CastExpr* E) { 346807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VTy = E->getType()->castAs<VectorType>(); 3469c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman unsigned NElts = VTy->getNumElements(); 34701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3471d62ca370b03b8c6ad58002d3399383baf744e32bRichard Smith const Expr *SE = E->getSubExpr(); 3472e8c9e9218f215ec6089f12b076c7b9d310fd5194Nate Begeman QualType SETy = SE->getType(); 347359b5da6d853b4368b984700315adf7b37de05764Nate Begeman 347446a523285928aa07bf14803178dc04616ac85994Eli Friedman switch (E->getCastKind()) { 347546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_VectorSplat: { 347607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith APValue Val = APValue(); 347746a523285928aa07bf14803178dc04616ac85994Eli Friedman if (SETy->isIntegerType()) { 347846a523285928aa07bf14803178dc04616ac85994Eli Friedman APSInt IntResult; 347946a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateInteger(SE, IntResult, Info)) 3480f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 348107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Val = APValue(IntResult); 348246a523285928aa07bf14803178dc04616ac85994Eli Friedman } else if (SETy->isRealFloatingType()) { 348346a523285928aa07bf14803178dc04616ac85994Eli Friedman APFloat F(0.0); 348446a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateFloat(SE, F, Info)) 3485f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 348607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Val = APValue(F); 348746a523285928aa07bf14803178dc04616ac85994Eli Friedman } else { 348807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Error(E); 348946a523285928aa07bf14803178dc04616ac85994Eli Friedman } 3490c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman 3491c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman // Splat and create vector APValue. 349207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith SmallVector<APValue, 4> Elts(NElts, Val); 349307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elts, E); 3494e8c9e9218f215ec6089f12b076c7b9d310fd5194Nate Begeman } 3495e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman case CK_BitCast: { 3496e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Evaluate the operand into an APInt we can extract from. 3497e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt SValInt; 3498e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (!EvalAndBitcastToAPInt(Info, SE, SValInt)) 3499e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 3500e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Extract the elements 3501e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType EltTy = VTy->getElementType(); 3502e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned EltSize = Info.Ctx.getTypeSize(EltTy); 3503e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); 3504e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman SmallVector<APValue, 4> Elts; 3505e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (EltTy->isRealFloatingType()) { 3506e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(EltTy); 3507e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool isIEESem = &Sem != &APFloat::PPCDoubleDouble; 3508e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned FloatEltSize = EltSize; 3509e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (&Sem == &APFloat::x87DoubleExtended) 3510e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman FloatEltSize = 80; 3511e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < NElts; i++) { 3512e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt Elt; 3513e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 3514e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotl(i*EltSize+FloatEltSize).trunc(FloatEltSize); 3515e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 3516e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotr(i*EltSize).trunc(FloatEltSize); 3517e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elts.push_back(APValue(APFloat(Elt, isIEESem))); 3518e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3519e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else if (EltTy->isIntegerType()) { 3520e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < NElts; i++) { 3521e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt Elt; 3522e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 3523e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotl(i*EltSize+EltSize).zextOrTrunc(EltSize); 3524e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 3525e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotr(i*EltSize).zextOrTrunc(EltSize); 3526e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elts.push_back(APValue(APSInt(Elt, EltTy->isSignedIntegerType()))); 3527e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3528e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else { 3529e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return Error(E); 3530e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3531e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return Success(Elts, E); 3532e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 353346a523285928aa07bf14803178dc04616ac85994Eli Friedman default: 3534c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 3535c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman } 353659b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 353759b5da6d853b4368b984700315adf7b37de05764Nate Begeman 353807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool 353959b5da6d853b4368b984700315adf7b37de05764Nate BegemanVectorExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 354007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VT = E->getType()->castAs<VectorType>(); 354159b5da6d853b4368b984700315adf7b37de05764Nate Begeman unsigned NumInits = E->getNumInits(); 354291110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman unsigned NumElements = VT->getNumElements(); 35431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 354459b5da6d853b4368b984700315adf7b37de05764Nate Begeman QualType EltTy = VT->getElementType(); 35455f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<APValue, 4> Elements; 354659b5da6d853b4368b984700315adf7b37de05764Nate Begeman 35473edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // The number of initializers can be less than the number of 35483edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // vector elements. For OpenCL, this can be due to nested vector 35493edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // initialization. For GCC compatibility, missing trailing elements 35503edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // should be initialized with zeroes. 35513edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman unsigned CountInits = 0, CountElts = 0; 35523edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman while (CountElts < NumElements) { 35533edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // Handle nested vector initialization. 35543edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits 35553edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman && E->getInit(CountInits)->getType()->isExtVectorType()) { 35563edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman APValue v; 35573edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateVector(E->getInit(CountInits), v, Info)) 35583edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 35593edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman unsigned vlen = v.getVectorLength(); 35603edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman for (unsigned j = 0; j < vlen; j++) 35613edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(v.getVectorElt(j)); 35623edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts += vlen; 35633edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else if (EltTy->isIntegerType()) { 356459b5da6d853b4368b984700315adf7b37de05764Nate Begeman llvm::APSInt sInt(32); 35653edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits) { 35663edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateInteger(E->getInit(CountInits), sInt, Info)) 35673edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 35683edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else // trailing integer zero. 35693edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman sInt = Info.Ctx.MakeIntValue(0, EltTy); 35703edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(APValue(sInt)); 35713edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts++; 357259b5da6d853b4368b984700315adf7b37de05764Nate Begeman } else { 357359b5da6d853b4368b984700315adf7b37de05764Nate Begeman llvm::APFloat f(0.0); 35743edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits) { 35753edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateFloat(E->getInit(CountInits), f, Info)) 35763edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 35773edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else // trailing float zero. 35783edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman f = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy)); 35793edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(APValue(f)); 35803edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts++; 358159b5da6d853b4368b984700315adf7b37de05764Nate Begeman } 35823edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountInits++; 358359b5da6d853b4368b984700315adf7b37de05764Nate Begeman } 358407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elements, E); 358559b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 358659b5da6d853b4368b984700315adf7b37de05764Nate Begeman 358707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool 358851201882382fb40c9456a06c7f93d6ddd4a57712Richard SmithVectorExprEvaluator::ZeroInitialization(const Expr *E) { 358907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VT = E->getType()->getAs<VectorType>(); 359091110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman QualType EltTy = VT->getElementType(); 359191110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman APValue ZeroElement; 359291110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman if (EltTy->isIntegerType()) 359391110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman ZeroElement = APValue(Info.Ctx.MakeIntValue(0, EltTy)); 359491110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman else 359591110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman ZeroElement = 359691110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman APValue(APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy))); 359791110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 35985f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<APValue, 4> Elements(VT->getNumElements(), ZeroElement); 359907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elements, E); 360091110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman} 360191110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 360207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool VectorExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 36038327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 360451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 360591110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman} 360691110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 360759b5da6d853b4368b984700315adf7b37de05764Nate Begeman//===----------------------------------------------------------------------===// 3608cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith// Array Evaluation 3609cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith//===----------------------------------------------------------------------===// 3610cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3611cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smithnamespace { 3612cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith class ArrayExprEvaluator 3613cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith : public ExprEvaluatorBase<ArrayExprEvaluator, bool> { 3614180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue &This; 3615cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith APValue &Result; 3616cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith public: 3617cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3618180f47959a066795cc0f409433023af448bb0328Richard Smith ArrayExprEvaluator(EvalInfo &Info, const LValue &This, APValue &Result) 3619180f47959a066795cc0f409433023af448bb0328Richard Smith : ExprEvaluatorBaseTy(Info), This(This), Result(Result) {} 3620cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3621cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith bool Success(const APValue &V, const Expr *E) { 3622cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith assert(V.isArray() && "Expected array type"); 3623cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith Result = V; 3624cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 3625cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 3626cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 362751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3628180f47959a066795cc0f409433023af448bb0328Richard Smith const ConstantArrayType *CAT = 3629180f47959a066795cc0f409433023af448bb0328Richard Smith Info.Ctx.getAsConstantArrayType(E->getType()); 3630180f47959a066795cc0f409433023af448bb0328Richard Smith if (!CAT) 3631f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3632180f47959a066795cc0f409433023af448bb0328Richard Smith 3633180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitArray(), 0, 3634180f47959a066795cc0f409433023af448bb0328Richard Smith CAT->getSize().getZExtValue()); 3635180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Result.hasArrayFiller()) return true; 3636180f47959a066795cc0f409433023af448bb0328Richard Smith 363751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Zero-initialize all elements. 3638180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3639b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 3640180f47959a066795cc0f409433023af448bb0328Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 3641180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateConstantExpression(Result.getArrayFiller(), Info, 3642180f47959a066795cc0f409433023af448bb0328Richard Smith Subobject, &VIE); 3643180f47959a066795cc0f409433023af448bb0328Richard Smith } 3644180f47959a066795cc0f409433023af448bb0328Richard Smith 3645cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith bool VisitInitListExpr(const InitListExpr *E); 3646e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E); 3647cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith }; 3648cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} // end anonymous namespace 3649cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3650180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateArray(const Expr *E, const LValue &This, 3651180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result, EvalInfo &Info) { 365251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith assert(E->isRValue() && E->getType()->isArrayType() && "not an array rvalue"); 3653180f47959a066795cc0f409433023af448bb0328Richard Smith return ArrayExprEvaluator(Info, This, Result).Visit(E); 3654cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 3655cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3656cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smithbool ArrayExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 3657cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(E->getType()); 3658cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (!CAT) 3659f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3660cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3661974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // C++11 [dcl.init.string]p1: A char array [...] can be initialized by [...] 3662974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // an appropriately-typed string literal enclosed in braces. 3663ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (E->getNumInits() == 1 && E->getInit(0)->isGLValue() && 3664974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith Info.Ctx.hasSameUnqualifiedType(E->getType(), E->getInit(0)->getType())) { 3665974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith LValue LV; 3666974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith if (!EvaluateLValue(E->getInit(0), LV, Info)) 3667974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith return false; 3668974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith uint64_t NumElements = CAT->getSize().getZExtValue(); 3669974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith Result = APValue(APValue::UninitArray(), NumElements, NumElements); 3670974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith 3671974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // Copy the string literal into the array. FIXME: Do this better. 3672b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LV.addArray(Info, E, CAT); 3673974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith for (uint64_t I = 0; I < NumElements; ++I) { 3674974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith CCValue Char; 3675974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith if (!HandleLValueToRValueConversion(Info, E->getInit(0), 3676745f5147e065900267c85a5568785a1991d4838fRichard Smith CAT->getElementType(), LV, Char) || 3677745f5147e065900267c85a5568785a1991d4838fRichard Smith !CheckConstantExpression(Info, E->getInit(0), Char, 3678745f5147e065900267c85a5568785a1991d4838fRichard Smith Result.getArrayInitializedElt(I)) || 3679745f5147e065900267c85a5568785a1991d4838fRichard Smith !HandleLValueArrayAdjustment(Info, E->getInit(0), LV, 3680b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CAT->getElementType(), 1)) 3681974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith return false; 3682974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith } 3683974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith return true; 3684974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith } 3685974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith 3686745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 3687745f5147e065900267c85a5568785a1991d4838fRichard Smith 3688cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith Result = APValue(APValue::UninitArray(), E->getNumInits(), 3689cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith CAT->getSize().getZExtValue()); 3690180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3691b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 3692180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned Index = 0; 3693cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith for (InitListExpr::const_iterator I = E->begin(), End = E->end(); 3694180f47959a066795cc0f409433023af448bb0328Richard Smith I != End; ++I, ++Index) { 3695180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateConstantExpression(Result.getArrayInitializedElt(Index), 3696745f5147e065900267c85a5568785a1991d4838fRichard Smith Info, Subobject, cast<Expr>(*I)) || 3697745f5147e065900267c85a5568785a1991d4838fRichard Smith !HandleLValueArrayAdjustment(Info, cast<Expr>(*I), Subobject, 3698745f5147e065900267c85a5568785a1991d4838fRichard Smith CAT->getElementType(), 1)) { 3699745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 3700745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 3701745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 3702745f5147e065900267c85a5568785a1991d4838fRichard Smith } 3703180f47959a066795cc0f409433023af448bb0328Richard Smith } 3704cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3705745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Result.hasArrayFiller()) return Success; 3706cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith assert(E->hasArrayFiller() && "no array filler for incomplete init list"); 3707180f47959a066795cc0f409433023af448bb0328Richard Smith // FIXME: The Subobject here isn't necessarily right. This rarely matters, 3708180f47959a066795cc0f409433023af448bb0328Richard Smith // but sometimes does: 3709180f47959a066795cc0f409433023af448bb0328Richard Smith // struct S { constexpr S() : p(&p) {} void *p; }; 3710180f47959a066795cc0f409433023af448bb0328Richard Smith // S s[10] = {}; 3711cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return EvaluateConstantExpression(Result.getArrayFiller(), Info, 3712745f5147e065900267c85a5568785a1991d4838fRichard Smith Subobject, E->getArrayFiller()) && Success; 3713cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 3714cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3715e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool ArrayExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) { 3716e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(E->getType()); 3717e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!CAT) 3718f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3719e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3720ec789163a42a7be654ac34aadb750b508954d53cRichard Smith bool HadZeroInit = !Result.isUninit(); 3721ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!HadZeroInit) 3722ec789163a42a7be654ac34aadb750b508954d53cRichard Smith Result = APValue(APValue::UninitArray(), 0, CAT->getSize().getZExtValue()); 3723e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.hasArrayFiller()) 3724e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3725e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3726e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXConstructorDecl *FD = E->getConstructor(); 37276180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 372851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInit = E->requiresZeroInitialization(); 372951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) { 3730ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (HadZeroInit) 3731ec789163a42a7be654ac34aadb750b508954d53cRichard Smith return true; 3732ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 373351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit) { 373451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3735b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 373651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 373751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return EvaluateConstantExpression(Result.getArrayFiller(), Info, 373851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Subobject, &VIE); 373951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 374051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 37416180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith const CXXRecordDecl *RD = FD->getParent(); 37426180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (RD->isUnion()) 37436180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result.getArrayFiller() = APValue((FieldDecl*)0); 37446180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith else 37456180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result.getArrayFiller() = 37466180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith APValue(APValue::UninitStruct(), RD->getNumBases(), 37476180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith std::distance(RD->field_begin(), RD->field_end())); 37486180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 37496180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 37506180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 3751e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const FunctionDecl *Definition = 0; 3752e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith FD->getBody(Definition); 3753e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3754c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition)) 3755c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 3756e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3757e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // FIXME: The Subobject here isn't necessarily right. This rarely matters, 3758e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // but sometimes does: 3759e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // struct S { constexpr S() : p(&p) {} void *p; }; 3760e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // S s[10]; 3761e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue Subobject = This; 3762b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 376351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3764ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (ZeroInit && !HadZeroInit) { 376551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 376651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!EvaluateConstantExpression(Result.getArrayFiller(), Info, Subobject, 376751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith &VIE)) 376851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 376951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 377051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3771e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 3772745f5147e065900267c85a5568785a1991d4838fRichard Smith return HandleConstructorCall(E->getExprLoc(), Subobject, Args, 3773e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith cast<CXXConstructorDecl>(Definition), 3774e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Info, Result.getArrayFiller()); 3775e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3776e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3777cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith//===----------------------------------------------------------------------===// 3778f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner// Integer Evaluation 3779c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 3780c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// As a GNU extension, we support casting pointers to sufficiently-wide integer 3781c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// types and back in constant folding. Integer values are thus represented 3782c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// either as an integer-valued APValue, or as an lvalue-valued APValue. 3783f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 3784f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3785f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnernamespace { 3786770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass IntExprEvaluator 37878cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<IntExprEvaluator, bool> { 378847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue &Result; 3789f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnerpublic: 379047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith IntExprEvaluator(EvalInfo &info, CCValue &result) 37918cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(result) {} 3792f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3793973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool Success(const llvm::APSInt &SI, const Expr *E) { 3794973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(E->getType()->isIntegralOrEnumerationType() && 37952ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 3796973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(SI.isSigned() == E->getType()->isSignedIntegerOrEnumerationType() && 37973f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 3798973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(SI.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && 37993f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 380047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = CCValue(SI); 38013f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar return true; 38023f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 38033f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar 3804131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar bool Success(const llvm::APInt &I, const Expr *E) { 38052ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor assert(E->getType()->isIntegralOrEnumerationType() && 38062ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 380730c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar assert(I.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && 38083f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 380947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = CCValue(APSInt(I)); 3810575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor Result.getInt().setIsUnsigned( 3811575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor E->getType()->isUnsignedIntegerOrEnumerationType()); 3812131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return true; 3813131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 3814131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 3815131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar bool Success(uint64_t Value, const Expr *E) { 38162ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor assert(E->getType()->isIntegralOrEnumerationType() && 38172ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 381847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = CCValue(Info.Ctx.MakeIntValue(Value, E->getType())); 3819131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return true; 3820131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 3821131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 38224f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck bool Success(CharUnits Size, const Expr *E) { 38234f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(Size.getQuantity(), E); 38244f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck } 38254f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck 382647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith bool Success(const CCValue &V, const Expr *E) { 38275930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (V.isLValue() || V.isAddrLabelDiff()) { 3828342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith Result = V; 3829342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith return true; 3830342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith } 38318cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return Success(V.getInt(), E); 383232fea9d18cc3658a1b01df5ca6f2ac302625c61dChris Lattner } 38331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 383451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { return Success(0, E); } 3835f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 38368cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 38378cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne // Visitor Methods 38388cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 3839f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 38404c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner bool VisitIntegerLiteral(const IntegerLiteral *E) { 3841131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 38424c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner } 38434c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner bool VisitCharacterLiteral(const CharacterLiteral *E) { 3844131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 38454c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner } 3846043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman 3847043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool CheckReferencedDecl(const Expr *E, const Decl *D); 3848043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool VisitDeclRefExpr(const DeclRefExpr *E) { 38498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (CheckReferencedDecl(E, E->getDecl())) 38508cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 38518cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 38528cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitDeclRefExpr(E); 3853043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 3854043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool VisitMemberExpr(const MemberExpr *E) { 3855043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman if (CheckReferencedDecl(E, E->getMemberDecl())) { 3856c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith VisitIgnoredValue(E->getBase()); 3857043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman return true; 3858043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 38598cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 38608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitMemberExpr(E); 3861043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 3862043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman 38638cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCallExpr(const CallExpr *E); 3864b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner bool VisitBinaryOperator(const BinaryOperator *E); 38658ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor bool VisitOffsetOfExpr(const OffsetOfExpr *E); 3866b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner bool VisitUnaryOperator(const UnaryOperator *E); 3867f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 38688cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr* E); 3869f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E); 38700518999d3adcc289997bd974dce90cc97f5c1c44Sebastian Redl 38713068d117951a8df54bae9db039b56201ab10962bAnders Carlsson bool VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) { 3872131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 38733068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 38741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3875f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith // Note, GNU defines __null as an integer, not a pointer. 38763f70456b8adb0405ef2a47d51f9fc2d5937ae8aeAnders Carlsson bool VisitGNUNullExpr(const GNUNullExpr *E) { 387751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 3878664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman } 3879664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 388064b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl bool VisitUnaryTypeTraitExpr(const UnaryTypeTraitExpr *E) { 38810dfd848fa4c9664852ba8c929a8bd3fce93ddca2Sebastian Redl return Success(E->getValue(), E); 388264b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl } 388364b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl 38846ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet bool VisitBinaryTypeTraitExpr(const BinaryTypeTraitExpr *E) { 38856ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet return Success(E->getValue(), E); 38866ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet } 38876ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet 388821ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley bool VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) { 388921ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley return Success(E->getValue(), E); 389021ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley } 389121ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley 3892552622067dc45013d240f73952fece703f5e63bdJohn Wiegley bool VisitExpressionTraitExpr(const ExpressionTraitExpr *E) { 3893552622067dc45013d240f73952fece703f5e63bdJohn Wiegley return Success(E->getValue(), E); 3894552622067dc45013d240f73952fece703f5e63bdJohn Wiegley } 3895552622067dc45013d240f73952fece703f5e63bdJohn Wiegley 3896722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman bool VisitUnaryReal(const UnaryOperator *E); 3897664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman bool VisitUnaryImag(const UnaryOperator *E); 3898664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 3899295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl bool VisitCXXNoexceptExpr(const CXXNoexceptExpr *E); 3900ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor bool VisitSizeOfPackExpr(const SizeOfPackExpr *E); 3901cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 3902fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattnerprivate: 39038b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck CharUnits GetAlignOfExpr(const Expr *E); 39048b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck CharUnits GetAlignOfType(QualType T); 39051bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith static QualType GetObjectType(APValue::LValueBase B); 39068cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool TryEvaluateBuiltinObjectSize(const CallExpr *E); 3907664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman // FIXME: Missing: array subscript of vector, member of vector 3908f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner}; 3909f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} // end anonymous namespace 3910f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3911c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// EvaluateIntegerOrLValue - Evaluate an rvalue integral-typed expression, and 3912c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// produce either the integer value or a pointer. 3913c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// 3914c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// GCC has a heinous extension which folds casts between pointer types and 3915c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// pointer-sized integral types. We support this by allowing the evaluation of 3916c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// an integer rvalue to produce a pointer (represented as an lvalue) instead. 3917c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// Some simple arithmetic on such values is supported (they are treated much 3918c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// like char*). 3919f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateIntegerOrLValue(const Expr *E, CCValue &Result, 392047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith EvalInfo &Info) { 3921c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isIntegralOrEnumerationType()); 39228cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return IntExprEvaluator(Info, Result).Visit(E); 392369ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar} 392469ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar 3925f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info) { 392647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue Val; 3927f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateIntegerOrLValue(E, Val, Info)) 3928f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 3929f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Val.isInt()) { 3930f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: It would be better to produce the diagnostic for casting 3931f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // a pointer to an integer. 3932dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 393330c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return false; 3934f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 393530c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar Result = Val.getInt(); 393630c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return true; 3937f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} 3938f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3939f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Check whether the given declaration can be directly converted to an integral 3940f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// rvalue. If not, no diagnostic is produced; there are other things we can 3941f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// try. 3942043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedmanbool IntExprEvaluator::CheckReferencedDecl(const Expr* E, const Decl* D) { 39434c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // Enums are integer constant exprs. 3944bfbdcd861a4364bfc21a9e5047bdbd56812d6693Abramo Bagnara if (const EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(D)) { 3945973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // Check for signedness/width mismatches between E type and ECD value. 3946973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool SameSign = (ECD->getInitVal().isSigned() 3947973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara == E->getType()->isSignedIntegerOrEnumerationType()); 3948973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool SameWidth = (ECD->getInitVal().getBitWidth() 3949973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara == Info.Ctx.getIntWidth(E->getType())); 3950973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (SameSign && SameWidth) 3951973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara return Success(ECD->getInitVal(), E); 3952973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara else { 3953973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // Get rid of mismatch (otherwise Success assertions will fail) 3954973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // by computing a new value matching the type of E. 3955973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara llvm::APSInt Val = ECD->getInitVal(); 3956973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (!SameSign) 3957973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara Val.setIsSigned(!ECD->getInitVal().isSigned()); 3958973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (!SameWidth) 3959973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara Val = Val.extOrTrunc(Info.Ctx.getIntWidth(E->getType())); 3960973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara return Success(Val, E); 3961973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara } 3962bfbdcd861a4364bfc21a9e5047bdbd56812d6693Abramo Bagnara } 39638cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return false; 39644c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner} 39654c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner 3966a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner/// EvaluateBuiltinClassifyType - Evaluate __builtin_classify_type the same way 3967a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner/// as GCC. 3968a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattnerstatic int EvaluateBuiltinClassifyType(const CallExpr *E) { 3969a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner // The following enum mimics the values returned by GCC. 39707c80bd64032e610c0dbd74fc0ef6ea334447f2fdSebastian Redl // FIXME: Does GCC differ between lvalue and rvalue references here? 3971a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner enum gcc_type_class { 3972a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner no_type_class = -1, 3973a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner void_type_class, integer_type_class, char_type_class, 3974a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner enumeral_type_class, boolean_type_class, 3975a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner pointer_type_class, reference_type_class, offset_type_class, 3976a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner real_type_class, complex_type_class, 3977a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner function_type_class, method_type_class, 3978a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner record_type_class, union_type_class, 3979a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner array_type_class, string_type_class, 3980a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner lang_type_class 3981a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner }; 39821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 39831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If no argument was supplied, default to "no_type_class". This isn't 3984a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner // ideal, however it is what gcc does. 3985a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner if (E->getNumArgs() == 0) 3986a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return no_type_class; 39871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3988a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner QualType ArgTy = E->getArg(0)->getType(); 3989a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner if (ArgTy->isVoidType()) 3990a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return void_type_class; 3991a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isEnumeralType()) 3992a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return enumeral_type_class; 3993a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isBooleanType()) 3994a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return boolean_type_class; 3995a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isCharType()) 3996a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return string_type_class; // gcc doesn't appear to use char_type_class 3997a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isIntegerType()) 3998a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return integer_type_class; 3999a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isPointerType()) 4000a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return pointer_type_class; 4001a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isReferenceType()) 4002a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return reference_type_class; 4003a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isRealType()) 4004a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return real_type_class; 4005a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isComplexType()) 4006a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return complex_type_class; 4007a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isFunctionType()) 4008a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return function_type_class; 4009fb87b89fc9eb103e19fb8e4b925c23f0bd091b99Douglas Gregor else if (ArgTy->isStructureOrClassType()) 4010a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return record_type_class; 4011a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isUnionType()) 4012a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return union_type_class; 4013a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isArrayType()) 4014a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return array_type_class; 4015a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isUnionType()) 4016a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return union_type_class; 4017a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else // FIXME: offset_type_class, method_type_class, & lang_type_class? 4018b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("CallExpr::isBuiltinClassifyType(): unimplemented type"); 4019a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner} 4020a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner 402180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// EvaluateBuiltinConstantPForLValue - Determine the result of 402280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// __builtin_constant_p when applied to the given lvalue. 402380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// 402480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// An lvalue is only "constant" if it is a pointer or reference to the first 402580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// character of a string literal. 402680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithtemplate<typename LValue> 402780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithstatic bool EvaluateBuiltinConstantPForLValue(const LValue &LV) { 402880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith const Expr *E = LV.getLValueBase().dyn_cast<const Expr*>(); 402980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return E && isa<StringLiteral>(E) && LV.getLValueOffset().isZero(); 403080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith} 403180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 403280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// EvaluateBuiltinConstantP - Evaluate __builtin_constant_p as similarly to 403380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// GCC as we can manage. 403480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithstatic bool EvaluateBuiltinConstantP(ASTContext &Ctx, const Expr *Arg) { 403580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith QualType ArgType = Arg->getType(); 403680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 403780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // __builtin_constant_p always has one operand. The rules which gcc follows 403880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // are not precisely documented, but are as follows: 403980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 404080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // - If the operand is of integral, floating, complex or enumeration type, 404180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // and can be folded to a known value of that type, it returns 1. 404280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // - If the operand and can be folded to a pointer to the first character 404380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // of a string literal (or such a pointer cast to an integral type), it 404480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // returns 1. 404580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 404680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // Otherwise, it returns 0. 404780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 404880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // FIXME: GCC also intends to return 1 for literals of aggregate types, but 404980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // its support for this does not currently work. 405080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (ArgType->isIntegralOrEnumerationType()) { 405180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith Expr::EvalResult Result; 405280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!Arg->EvaluateAsRValue(Result, Ctx) || Result.HasSideEffects) 405380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 405480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 405580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith APValue &V = Result.Val; 405680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (V.getKind() == APValue::Int) 405780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return true; 405880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 405980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return EvaluateBuiltinConstantPForLValue(V); 406080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } else if (ArgType->isFloatingType() || ArgType->isAnyComplexType()) { 406180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return Arg->isEvaluatable(Ctx); 406280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } else if (ArgType->isPointerType() || Arg->isGLValue()) { 406380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith LValue LV; 406480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith Expr::EvalStatus Status; 406580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith EvalInfo Info(Ctx, Status); 406680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if ((Arg->isGLValue() ? EvaluateLValue(Arg, LV, Info) 406780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith : EvaluatePointer(Arg, LV, Info)) && 406880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith !Status.HasSideEffects) 406980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return EvaluateBuiltinConstantPForLValue(LV); 407080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } 407180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 407280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // Anything else isn't considered to be sufficiently constant. 407380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 407480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith} 407580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 407642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall/// Retrieves the "underlying object type" of the given expression, 407742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall/// as used by __builtin_object_size. 40781bf9a9e6a5bdc0de7939908855dcddf46b661800Richard SmithQualType IntExprEvaluator::GetObjectType(APValue::LValueBase B) { 40791bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { 40801bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 408142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return VD->getType(); 40821bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith } else if (const Expr *E = B.get<const Expr*>()) { 40831bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (isa<CompoundLiteralExpr>(E)) 40841bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return E->getType(); 408542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall } 408642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 408742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return QualType(); 408842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 408942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 40908cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::TryEvaluateBuiltinObjectSize(const CallExpr *E) { 409142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall // TODO: Perhaps we should let LLVM lower this? 409242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall LValue Base; 409342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (!EvaluatePointer(E->getArg(0), Base, Info)) 409442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return false; 409542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 409642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall // If we can prove the base is null, lower to zero now. 40971bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!Base.getLValueBase()) return Success(0, E); 409842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 40991bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType T = GetObjectType(Base.getLValueBase()); 410042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (T.isNull() || 410142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isIncompleteType() || 41021357869bc5983cdfbc986db1f3d18265bb34cb0eEli Friedman T->isFunctionType() || 410342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isVariablyModifiedType() || 410442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isDependentType()) 4105f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 410642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 410742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall CharUnits Size = Info.Ctx.getTypeSizeInChars(T); 410842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall CharUnits Offset = Base.getLValueOffset(); 410942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 411042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (!Offset.isNegative() && Offset <= Size) 411142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall Size -= Offset; 411242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall else 411342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall Size = CharUnits::Zero(); 41144f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(Size, E); 411542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 411642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 41178cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitCallExpr(const CallExpr *E) { 4118180f47959a066795cc0f409433023af448bb0328Richard Smith switch (E->isBuiltinCall()) { 4119019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner default: 41208cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 412164eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 412264eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump case Builtin::BI__builtin_object_size: { 412342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (TryEvaluateBuiltinObjectSize(E)) 412442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return true; 412564eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 4126b2aaf51ed73a4774322a39a0dd59d0fe7e3258c0Eric Christopher // If evaluating the argument has side-effects we can't determine 4127b2aaf51ed73a4774322a39a0dd59d0fe7e3258c0Eric Christopher // the size of the object and lower it to unknown now. 4128393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian if (E->getArg(0)->HasSideEffects(Info.Ctx)) { 4129a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith if (E->getArg(1)->EvaluateKnownConstInt(Info.Ctx).getZExtValue() <= 1) 4130cf184655319cf7a5b811067cff9d26a5741fd161Chris Lattner return Success(-1ULL, E); 413164eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump return Success(0, E); 413264eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump } 4133c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 4134f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 413564eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump } 413664eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 4137019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_classify_type: 4138131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(EvaluateBuiltinClassifyType(E), E); 41391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 414080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith case Builtin::BI__builtin_constant_p: 414180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return Success(EvaluateBuiltinConstantP(Info.Ctx, E->getArg(0)), E); 4142e052d46f4db91f9ba572859ffc984e85cbf5d5ffRichard Smith 414321fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner case Builtin::BI__builtin_eh_return_data_regno: { 4144a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith int Operand = E->getArg(0)->EvaluateKnownConstInt(Info.Ctx).getZExtValue(); 4145bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor Operand = Info.Ctx.getTargetInfo().getEHDataRegisterNumber(Operand); 414621fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner return Success(Operand, E); 414721fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner } 4148c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman 4149c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman case Builtin::BI__builtin_expect: 4150c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman return Visit(E->getArg(0)); 415140b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith 41525726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor case Builtin::BIstrlen: 415340b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith // A call to strlen is not a constant expression. 415440b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith if (Info.getLangOpts().CPlusPlus0x) 415540b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_invalid_function) 415640b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith << /*isConstexpr*/0 << /*isConstructor*/0 << "'strlen'"; 415740b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith else 415840b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 415940b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith // Fall through. 41605726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor case Builtin::BI__builtin_strlen: 41615726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // As an extension, we support strlen() and __builtin_strlen() as constant 41625726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // expressions when the argument is a string literal. 41638cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (const StringLiteral *S 41645726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor = dyn_cast<StringLiteral>(E->getArg(0)->IgnoreParenImpCasts())) { 41655726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // The string literal may have embedded null characters. Find the first 41665726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // one and truncate there. 41675f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef Str = S->getString(); 41685f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef::size_type Pos = Str.find(0); 41695f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner if (Pos != StringRef::npos) 41705726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor Str = Str.substr(0, Pos); 41715726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor 41725726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor return Success(Str.size(), E); 41735726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor } 41745726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor 4175f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4176454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4177454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman case Builtin::BI__atomic_is_lock_free: { 4178454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman APSInt SizeVal; 4179454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (!EvaluateInteger(E->getArg(0), SizeVal, Info)) 4180454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return false; 4181454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4182454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // For __atomic_is_lock_free(sizeof(_Atomic(T))), if the size is a power 4183454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // of two less than the maximum inline atomic width, we know it is 4184454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // lock-free. If the size isn't a power of two, or greater than the 4185454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // maximum alignment where we promote atomics, we know it is not lock-free 4186454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // (at least not in the sense of atomic_is_lock_free). Otherwise, 4187454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // the answer can only be determined at runtime; for example, 16-byte 4188454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // atomics have lock-free implementations on some, but not all, 4189454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // x86-64 processors. 4190454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4191454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check power-of-two. 4192454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman CharUnits Size = CharUnits::fromQuantity(SizeVal.getZExtValue()); 4193454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (!Size.isPowerOfTwo()) 4194454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#if 0 4195454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // FIXME: Suppress this folding until the ABI for the promotion width 4196454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // settles. 4197454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return Success(0, E); 4198454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#else 4199f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4200454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#endif 4201454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4202454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#if 0 4203454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check against promotion width. 4204454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // FIXME: Suppress this folding until the ABI for the promotion width 4205454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // settles. 4206454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman unsigned PromoteWidthBits = 4207454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman Info.Ctx.getTargetInfo().getMaxAtomicPromoteWidth(); 4208454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (Size > Info.Ctx.toCharUnitsFromBits(PromoteWidthBits)) 4209454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return Success(0, E); 4210454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#endif 4211454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4212454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check against inlining width. 4213454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman unsigned InlineWidthBits = 4214454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman Info.Ctx.getTargetInfo().getMaxAtomicInlineWidth(); 4215454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (Size <= Info.Ctx.toCharUnitsFromBits(InlineWidthBits)) 4216454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return Success(1, E); 4217454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4218f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4219454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman } 4220019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner } 42214c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner} 4222f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4223625b80755b603d28f36fb4212c81484d87ad08d3Richard Smithstatic bool HasSameBase(const LValue &A, const LValue &B) { 4224625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!A.getLValueBase()) 4225625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return !B.getLValueBase(); 4226625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!B.getLValueBase()) 4227625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4228625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 42291bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (A.getLValueBase().getOpaqueValue() != 42301bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith B.getLValueBase().getOpaqueValue()) { 4231625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const Decl *ADecl = GetLValueBaseDecl(A); 4232625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!ADecl) 4233625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4234625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const Decl *BDecl = GetLValueBaseDecl(B); 42359a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (!BDecl || ADecl->getCanonicalDecl() != BDecl->getCanonicalDecl()) 4236625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4237625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith } 4238625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 4239625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return IsGlobalLValue(A.getLValueBase()) || 4240177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith A.getLValueFrame() == B.getLValueFrame(); 4241625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith} 4242625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 42437b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// Perform the given integer operation, which is known to need at most BitWidth 42447b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// bits, and check for overflow in the original type (if that type was not an 42457b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// unsigned type). 42467b48a2986345480241f3b8209f71bb21b0530b4fRichard Smithtemplate<typename Operation> 42477b48a2986345480241f3b8209f71bb21b0530b4fRichard Smithstatic APSInt CheckedIntArithmetic(EvalInfo &Info, const Expr *E, 42487b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith const APSInt &LHS, const APSInt &RHS, 42497b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith unsigned BitWidth, Operation Op) { 42507b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (LHS.isUnsigned()) 42517b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Op(LHS, RHS); 42527b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 42537b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith APSInt Value(Op(LHS.extend(BitWidth), RHS.extend(BitWidth)), false); 42547b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith APSInt Result = Value.trunc(LHS.getBitWidth()); 42557b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (Result.extend(BitWidth) != Value) 42567b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith HandleOverflow(Info, E, Value, E->getType()); 42577b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Result; 42587b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith} 42597b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 4260b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattnerbool IntExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 4261c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isAssignmentOp()) 4262f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4263c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 42642de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Comma) { 42658327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getLHS()); 42668327fad71da34492d82c532f42a58cb4baff81a3Richard Smith return Visit(E->getRHS()); 4267a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 4268a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4269a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman if (E->isLogicalOp()) { 4270a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman // These need to be handled specially because the operands aren't 4271a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman // necessarily integral 4272fcb4d09531abbf2a5cf398c2f946fb3bc2875f64Anders Carlsson bool lhsResult, rhsResult; 42731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4274c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (EvaluateAsBooleanCondition(E->getLHS(), lhsResult, Info)) { 427551fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson // We were able to evaluate the LHS, see if we can get away with not 427651fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson // evaluating the RHS: 0 && X -> 0, 1 || X -> 1 42772de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (lhsResult == (E->getOpcode() == BO_LOr)) 42783f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar return Success(lhsResult, E); 4279a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4280c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (EvaluateAsBooleanCondition(E->getRHS(), rhsResult, Info)) { 42812de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_LOr) 4282131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(lhsResult || rhsResult, E); 42834bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson else 4284131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(lhsResult && rhsResult, E); 42854bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson } 42864bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson } else { 4287f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: If both evaluations fail, we should produce the diagnostic from 4288f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // the LHS. If the LHS is non-constant and the RHS is unevaluatable, it's 4289f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // less clear how to diagnose this. 4290c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (EvaluateAsBooleanCondition(E->getRHS(), rhsResult, Info)) { 42914bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson // We can't evaluate the LHS; however, sometimes the result 42924bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson // is determined by the RHS: X && 0 -> 0, X || 1 -> 1. 4293f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (rhsResult == (E->getOpcode() == BO_LOr)) { 4294131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar // Since we weren't able to evaluate the left hand side, it 4295fcb4d09531abbf2a5cf398c2f946fb3bc2875f64Anders Carlsson // must have had side effects. 42961e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith Info.EvalStatus.HasSideEffects = true; 4297131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 4298131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(rhsResult, E); 42994bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson } 43004bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson } 4301a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 4302a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4303a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman return false; 4304c8cc9ccc7b87a7ed1749b074f6b670bcec49abc1Chris Lattner } 430554176fdb044312b4b77c3da6682d3575b3728d30Chris Lattner 4306286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson QualType LHSTy = E->getLHS()->getType(); 4307286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson QualType RHSTy = E->getRHS()->getType(); 43084087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 43094087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar if (LHSTy->isAnyComplexType()) { 43104087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar assert(RHSTy->isAnyComplexType() && "Invalid comparison"); 4311f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS, RHS; 43124087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 4313745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateComplex(E->getLHS(), LHS, Info); 4314745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 43154087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar return false; 43164087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 4317745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK) 43184087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar return false; 43194087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 43204087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar if (LHS.isComplexFloat()) { 43211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump APFloat::cmpResult CR_r = 43224087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar LHS.getComplexFloatReal().compare(RHS.getComplexFloatReal()); 43231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump APFloat::cmpResult CR_i = 43244087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar LHS.getComplexFloatImag().compare(RHS.getComplexFloatImag()); 43254087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 43262de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_EQ) 4327131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((CR_r == APFloat::cmpEqual && 4328131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar CR_i == APFloat::cmpEqual), E); 4329131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar else { 43302de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall assert(E->getOpcode() == BO_NE && 4331131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar "Invalid complex comparison."); 43321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(((CR_r == APFloat::cmpGreaterThan || 4333fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_r == APFloat::cmpLessThan || 4334fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_r == APFloat::cmpUnordered) || 43351eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump (CR_i == APFloat::cmpGreaterThan || 4336fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_i == APFloat::cmpLessThan || 4337fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_i == APFloat::cmpUnordered)), E); 4338131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 43394087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } else { 43402de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_EQ) 4341131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((LHS.getComplexIntReal() == RHS.getComplexIntReal() && 4342131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar LHS.getComplexIntImag() == RHS.getComplexIntImag()), E); 4343131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar else { 43442de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall assert(E->getOpcode() == BO_NE && 4345131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar "Invalid compex comparison."); 4346131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((LHS.getComplexIntReal() != RHS.getComplexIntReal() || 4347131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar LHS.getComplexIntImag() != RHS.getComplexIntImag()), E); 4348131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 43494087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } 43504087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } 43511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4352286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson if (LHSTy->isRealFloatingType() && 4353286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson RHSTy->isRealFloatingType()) { 4354286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson APFloat RHS(0.0), LHS(0.0); 43551eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4356745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateFloat(E->getRHS(), RHS, Info); 4357745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 4358286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson return false; 43591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4360745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateFloat(E->getLHS(), LHS, Info) || !LHSOK) 4361286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson return false; 43621eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4363286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson APFloat::cmpResult CR = LHS.compare(RHS); 4364529569e68d10b0fd3750fd2124faf742249b846bAnders Carlsson 4365286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson switch (E->getOpcode()) { 4366286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson default: 4367b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Invalid binary operator!"); 43682de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LT: 4369131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpLessThan, E); 43702de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GT: 4371131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpGreaterThan, E); 43722de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LE: 4373131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpLessThan || CR == APFloat::cmpEqual, E); 43742de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GE: 43751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(CR == APFloat::cmpGreaterThan || CR == APFloat::cmpEqual, 4376131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar E); 43772de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_EQ: 4378131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpEqual, E); 43792de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_NE: 43801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(CR == APFloat::cmpGreaterThan 4381fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang || CR == APFloat::cmpLessThan 4382fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang || CR == APFloat::cmpUnordered, E); 4383286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson } 4384286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson } 43851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4386ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman if (LHSTy->isPointerType() && RHSTy->isPointerType()) { 4387625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (E->getOpcode() == BO_Sub || E->isComparisonOp()) { 4388745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue LHSValue, RHSValue; 4389745f5147e065900267c85a5568785a1991d4838fRichard Smith 4390745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluatePointer(E->getLHS(), LHSValue, Info); 4391745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && Info.keepEvaluatingAfterFailure()) 43923068d117951a8df54bae9db039b56201ab10962bAnders Carlsson return false; 4393a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4394745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluatePointer(E->getRHS(), RHSValue, Info) || !LHSOK) 43953068d117951a8df54bae9db039b56201ab10962bAnders Carlsson return false; 4396a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4397625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith // Reject differing bases from the normal codepath; we special-case 4398625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith // comparisons to null. 4399625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!HasSameBase(LHSValue, RHSValue)) { 440065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (E->getOpcode() == BO_Sub) { 440165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Handle &&A - &&B. 440265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSValue.Offset.isZero() || !RHSValue.Offset.isZero()) 440365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 440465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *LHSExpr = LHSValue.Base.dyn_cast<const Expr*>(); 440565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *RHSExpr = LHSValue.Base.dyn_cast<const Expr*>(); 440665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSExpr || !RHSExpr) 440765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 440865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); 440965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); 441065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSAddrExpr || !RHSAddrExpr) 441165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 44125930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman // Make sure both labels come from the same function. 44135930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (LHSAddrExpr->getLabel()->getDeclContext() != 44145930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman RHSAddrExpr->getLabel()->getDeclContext()) 44155930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman return false; 441665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman Result = CCValue(LHSAddrExpr, RHSAddrExpr); 441765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return true; 441865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman } 44199e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // Inequalities and subtractions between unrelated pointers have 44209e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // unspecified or undefined behavior. 44215bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman if (!E->isEqualityOp()) 4422f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4423ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman // A constant address may compare equal to the address of a symbol. 4424ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman // The one exception is that address of an object cannot compare equal 4425c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // to a null pointer constant. 4426ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman if ((!LHSValue.Base && !LHSValue.Offset.isZero()) || 4427ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman (!RHSValue.Base && !RHSValue.Offset.isZero())) 4428f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 44299e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // It's implementation-defined whether distinct literals will have 4430b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // distinct addresses. In clang, the result of such a comparison is 4431b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // unspecified, so it is not a constant expression. However, we do know 4432b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // that the address of a literal will be non-null. 443374f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith if ((IsLiteralLValue(LHSValue) || IsLiteralLValue(RHSValue)) && 443474f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith LHSValue.Base && RHSValue.Base) 4435f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 44369e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // We can't tell whether weak symbols will end up pointing to the same 44379e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // object. 44389e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith if (IsWeakLValue(LHSValue) || IsWeakLValue(RHSValue)) 4439f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 44409e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // Pointers with different bases cannot represent the same object. 4441c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // (Note that clang defaults to -fmerge-all-constants, which can 4442c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // lead to inconsistent results for comparisons involving the address 4443c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // of a constant; this generally doesn't matter in practice.) 44449e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith return Success(E->getOpcode() == BO_NE, E); 44455bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman } 4446a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 444715efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith const CharUnits &LHSOffset = LHSValue.getLValueOffset(); 444815efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith const CharUnits &RHSOffset = RHSValue.getLValueOffset(); 444915efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 4450f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith SubobjectDesignator &LHSDesignator = LHSValue.getLValueDesignator(); 4451f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith SubobjectDesignator &RHSDesignator = RHSValue.getLValueDesignator(); 4452f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 44532de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Sub) { 4454f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // C++11 [expr.add]p6: 4455f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Unless both pointers point to elements of the same array object, or 4456f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // one past the last element of the array object, the behavior is 4457f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // undefined. 4458f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LHSDesignator.Invalid && !RHSDesignator.Invalid && 4459f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !AreElementsOfSameArray(getType(LHSValue.Base), 4460f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith LHSDesignator, RHSDesignator)) 4461f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_subtraction_not_same_array); 4462f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 44634992bdde387c5f033bb450a716eaabc0fda52688Chris Lattner QualType Type = E->getLHS()->getType(); 44644992bdde387c5f033bb450a716eaabc0fda52688Chris Lattner QualType ElementType = Type->getAs<PointerType>()->getPointeeType(); 44653068d117951a8df54bae9db039b56201ab10962bAnders Carlsson 4466180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits ElementSize; 4467180f47959a066795cc0f409433023af448bb0328Richard Smith if (!HandleSizeof(Info, ElementType, ElementSize)) 4468180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 4469a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 447015efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // FIXME: LLVM and GCC both compute LHSOffset - RHSOffset at runtime, 447115efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // and produce incorrect results when it overflows. Such behavior 447215efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // appears to be non-conforming, but is common, so perhaps we should 447315efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // assume the standard intended for such cases to be undefined behavior 447415efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // and check for them. 447515efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 447615efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // Compute (LHSOffset - RHSOffset) / Size carefully, checking for 447715efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // overflow in the final conversion to ptrdiff_t. 447815efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt LHS( 447915efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)LHSOffset.getQuantity(), true), false); 448015efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt RHS( 448115efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)RHSOffset.getQuantity(), true), false); 448215efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt ElemSize( 448315efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)ElementSize.getQuantity(), true), false); 448415efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt TrueResult = (LHS - RHS) / ElemSize; 448515efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt Result = TrueResult.trunc(Info.Ctx.getIntWidth(E->getType())); 448615efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 448715efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith if (Result.extend(65) != TrueResult) 448815efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith HandleOverflow(Info, E, TrueResult, E->getType()); 448915efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith return Success(Result, E); 4490ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman } 4491625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 449282f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // C++11 [expr.rel]p3: 449382f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // Pointers to void (after pointer conversions) can be compared, with a 449482f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // result defined as follows: If both pointers represent the same 449582f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // address or are both the null pointer value, the result is true if the 449682f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // operator is <= or >= and false otherwise; otherwise the result is 449782f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // unspecified. 449882f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // We interpret this as applying to pointers to *cv* void. 449982f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith if (LHSTy->isVoidPointerType() && LHSOffset != RHSOffset && 4500f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith E->isRelationalOp()) 450182f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith CCEDiag(E, diag::note_constexpr_void_comparison); 450282f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith 4503f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // C++11 [expr.rel]p2: 4504f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - If two pointers point to non-static data members of the same object, 4505f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // or to subobjects or array elements fo such members, recursively, the 4506f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // pointer to the later declared member compares greater provided the 4507f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // two members have the same access control and provided their class is 4508f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // not a union. 4509f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // [...] 4510f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - Otherwise pointer comparisons are unspecified. 4511f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LHSDesignator.Invalid && !RHSDesignator.Invalid && 4512f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith E->isRelationalOp()) { 4513f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool WasArrayIndex; 4514f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned Mismatch = 4515f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith FindDesignatorMismatch(getType(LHSValue.Base), LHSDesignator, 4516f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith RHSDesignator, WasArrayIndex); 4517f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // At the point where the designators diverge, the comparison has a 4518f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // specified value if: 4519f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - we are comparing array indices 4520f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - we are comparing fields of a union, or fields with the same access 4521f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Otherwise, the result is unspecified and thus the comparison is not a 4522f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // constant expression. 4523f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!WasArrayIndex && Mismatch < LHSDesignator.Entries.size() && 4524f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Mismatch < RHSDesignator.Entries.size()) { 4525f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const FieldDecl *LF = getAsField(LHSDesignator.Entries[Mismatch]); 4526f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const FieldDecl *RF = getAsField(RHSDesignator.Entries[Mismatch]); 4527f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LF && !RF) 4528f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_classes); 4529f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!LF) 4530f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_field) 4531f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << getAsBaseClass(LHSDesignator.Entries[Mismatch]) 4532f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << RF->getParent() << RF; 4533f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!RF) 4534f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_field) 4535f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << getAsBaseClass(RHSDesignator.Entries[Mismatch]) 4536f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF->getParent() << LF; 4537f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!LF->getParent()->isUnion() && 4538f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith LF->getAccess() != RF->getAccess()) 4539f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_differing_access) 4540f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF << LF->getAccess() << RF << RF->getAccess() 4541f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF->getParent(); 4542f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 4543f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 4544f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 4545625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith switch (E->getOpcode()) { 4546625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith default: llvm_unreachable("missing comparison operator"); 4547625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_LT: return Success(LHSOffset < RHSOffset, E); 4548625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_GT: return Success(LHSOffset > RHSOffset, E); 4549625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_LE: return Success(LHSOffset <= RHSOffset, E); 4550625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_GE: return Success(LHSOffset >= RHSOffset, E); 4551625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_EQ: return Success(LHSOffset == RHSOffset, E); 4552625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_NE: return Success(LHSOffset != RHSOffset, E); 4553ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman } 45543068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 45553068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 4556b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4557b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (LHSTy->isMemberPointerType()) { 4558b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith assert(E->isEqualityOp() && "unexpected member pointer operation"); 4559b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith assert(RHSTy->isMemberPointerType() && "invalid comparison"); 4560b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4561b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith MemberPtr LHSValue, RHSValue; 4562b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4563b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool LHSOK = EvaluateMemberPointer(E->getLHS(), LHSValue, Info); 4564b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHSOK && Info.keepEvaluatingAfterFailure()) 4565b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 4566b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4567b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!EvaluateMemberPointer(E->getRHS(), RHSValue, Info) || !LHSOK) 4568b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 4569b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4570b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // C++11 [expr.eq]p2: 4571b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // If both operands are null, they compare equal. Otherwise if only one is 4572b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // null, they compare unequal. 4573b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHSValue.getDecl() || !RHSValue.getDecl()) { 4574b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool Equal = !LHSValue.getDecl() && !RHSValue.getDecl(); 4575b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return Success(E->getOpcode() == BO_EQ ? Equal : !Equal, E); 4576b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 4577b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4578b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // Otherwise if either is a pointer to a virtual member function, the 4579b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // result is unspecified. 4580b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(LHSValue.getDecl())) 4581b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (MD->isVirtual()) 4582b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith CCEDiag(E, diag::note_constexpr_compare_virtual_mem_ptr) << MD; 4583b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(RHSValue.getDecl())) 4584b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (MD->isVirtual()) 4585b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith CCEDiag(E, diag::note_constexpr_compare_virtual_mem_ptr) << MD; 4586b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4587b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // Otherwise they compare equal if and only if they would refer to the 4588b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // same member of the same most derived object or the same subobject if 4589b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // they were dereferenced with a hypothetical object of the associated 4590b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // class type. 4591b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool Equal = LHSValue == RHSValue; 4592b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return Success(E->getOpcode() == BO_EQ ? Equal : !Equal, E); 4593b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 4594b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 45952ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor if (!LHSTy->isIntegralOrEnumerationType() || 45962ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor !RHSTy->isIntegralOrEnumerationType()) { 4597e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // We can't continue from here for non-integral types. 4598e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 4599a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 4600a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4601a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman // The LHS of a constant expr is always evaluated and needed. 460247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue LHSVal; 4603745f5147e065900267c85a5568785a1991d4838fRichard Smith 4604745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateIntegerOrLValue(E->getLHS(), LHSVal, Info); 4605745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 4606f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4607d9f4bcda18bfbf79341edd9d381d4b6a3cffe655Eli Friedman 4608745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Visit(E->getRHS()) || !LHSOK) 460930c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return false; 4610745f5147e065900267c85a5568785a1991d4838fRichard Smith 461147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue &RHSVal = Result; 461242edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 461342edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman // Handle cases like (unsigned long)&a + 4. 4614c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isAdditiveOp() && LHSVal.isLValue() && RHSVal.isInt()) { 4615a73058324197b7bdfd19307965954f626e26199dKen Dyck CharUnits AdditionalOffset = CharUnits::fromQuantity( 4616a73058324197b7bdfd19307965954f626e26199dKen Dyck RHSVal.getInt().getZExtValue()); 46172de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Add) 461847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith LHSVal.getLValueOffset() += AdditionalOffset; 461942edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman else 462047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith LHSVal.getLValueOffset() -= AdditionalOffset; 462147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = LHSVal; 462242edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman return true; 462342edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman } 462442edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 462542edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman // Handle cases like 4 + (unsigned long)&a 46262de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Add && 4627c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RHSVal.isLValue() && LHSVal.isInt()) { 462847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith RHSVal.getLValueOffset() += CharUnits::fromQuantity( 462947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith LHSVal.getInt().getZExtValue()); 463047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith // Note that RHSVal is Result. 463142edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman return true; 463242edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman } 463342edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 463465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (E->getOpcode() == BO_Sub && LHSVal.isLValue() && RHSVal.isLValue()) { 463565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Handle (intptr_t)&&A - (intptr_t)&&B. 463665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSVal.getLValueOffset().isZero() || 463765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman !RHSVal.getLValueOffset().isZero()) 463865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 463965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *LHSExpr = LHSVal.getLValueBase().dyn_cast<const Expr*>(); 464065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *RHSExpr = RHSVal.getLValueBase().dyn_cast<const Expr*>(); 464165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSExpr || !RHSExpr) 464265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 464365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); 464465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); 464565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSAddrExpr || !RHSAddrExpr) 464665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 46475930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman // Make sure both labels come from the same function. 46485930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (LHSAddrExpr->getLabel()->getDeclContext() != 46495930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman RHSAddrExpr->getLabel()->getDeclContext()) 46505930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman return false; 465165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman Result = CCValue(LHSAddrExpr, RHSAddrExpr); 465265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return true; 465365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman } 465465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman 465542edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman // All the following cases expect both operands to be an integer 4656c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!LHSVal.isInt() || !RHSVal.isInt()) 4657f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4658a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4659c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith APSInt &LHS = LHSVal.getInt(); 4660c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith APSInt &RHS = RHSVal.getInt(); 466142edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 4662a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson switch (E->getOpcode()) { 466332fea9d18cc3658a1b01df5ca6f2ac302625c61dChris Lattner default: 4664f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 46657b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith case BO_Mul: 46667b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 46677b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith LHS.getBitWidth() * 2, 46687b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith std::multiplies<APSInt>()), E); 46697b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith case BO_Add: 46707b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 46717b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith LHS.getBitWidth() + 1, 46727b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith std::plus<APSInt>()), E); 46737b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith case BO_Sub: 46747b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 46757b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith LHS.getBitWidth() + 1, 46767b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith std::minus<APSInt>()), E); 4677c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_And: return Success(LHS & RHS, E); 4678c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_Xor: return Success(LHS ^ RHS, E); 4679c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_Or: return Success(LHS | RHS, E); 46802de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 46813df61308ddfbdba0897b762a129b5a38750c87d0Richard Smith case BO_Rem: 468254176fdb044312b4b77c3da6682d3575b3728d30Chris Lattner if (RHS == 0) 4683f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_expr_divide_by_zero); 46843df61308ddfbdba0897b762a129b5a38750c87d0Richard Smith // Check for overflow case: INT_MIN / -1 or INT_MIN % -1. The latter is not 46853df61308ddfbdba0897b762a129b5a38750c87d0Richard Smith // actually undefined behavior in C++11 due to a language defect. 4686789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (RHS.isNegative() && RHS.isAllOnesValue() && 4687789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith LHS.isSigned() && LHS.isMinSignedValue()) 4688789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith HandleOverflow(Info, E, -LHS.extend(LHS.getBitWidth() + 1), E->getType()); 46893df61308ddfbdba0897b762a129b5a38750c87d0Richard Smith return Success(E->getOpcode() == BO_Rem ? LHS % RHS : LHS / RHS, E); 46902de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shl: { 4691789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // During constant-folding, a negative shift is an opposite shift. Such a 4692789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // shift is not a constant expression. 4693091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall if (RHS.isSigned() && RHS.isNegative()) { 4694789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_negative_shift) << RHS; 4695091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall RHS = -RHS; 4696091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall goto shift_right; 4697091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall } 4698091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall 4699091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall shift_left: 4700789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // C++11 [expr.shift]p1: Shift width must be less than the bit width of the 4701789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // shifted type. 4702789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); 4703789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (SA != RHS) { 4704789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_large_shift) 4705789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith << RHS << E->getType() << LHS.getBitWidth(); 4706789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } else if (LHS.isSigned()) { 4707789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // C++11 [expr.shift]p2: A signed left shift must have a non-negative 4708789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // operand, and must not overflow. 4709789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (LHS.isNegative()) 4710789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_lshift_of_negative) << LHS; 4711789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith else if (LHS.countLeadingZeros() <= SA) 4712789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith HandleOverflow(Info, E, LHS.extend(LHS.getBitWidth() + SA) << SA, 4713789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith E->getType()); 4714789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 4715789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 4716c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Success(LHS << SA, E); 47173f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 47182de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shr: { 4719789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // During constant-folding, a negative shift is an opposite shift. Such a 4720789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // shift is not a constant expression. 4721091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall if (RHS.isSigned() && RHS.isNegative()) { 4722789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_negative_shift) << RHS; 4723091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall RHS = -RHS; 4724091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall goto shift_left; 4725091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall } 4726091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall 4727091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall shift_right: 4728789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // C++11 [expr.shift]p1: Shift width must be less than the bit width of the 4729789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // shifted type. 4730789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); 4731789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (SA != RHS) 4732789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_large_shift) 4733789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith << RHS << E->getType() << LHS.getBitWidth(); 4734789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 4735c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Success(LHS >> SA, E); 47363f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 47371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4738c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_LT: return Success(LHS < RHS, E); 4739c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_GT: return Success(LHS > RHS, E); 4740c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_LE: return Success(LHS <= RHS, E); 4741c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_GE: return Success(LHS >= RHS, E); 4742c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_EQ: return Success(LHS == RHS, E); 4743c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_NE: return Success(LHS != RHS, E); 4744b11e77836dd0867955c5abf32baf1c3e6c7f81e1Eli Friedman } 4745a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 4746a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson 47478b752f10c394b140f9ef89e049cbad1a7676fc25Ken DyckCharUnits IntExprEvaluator::GetAlignOfType(QualType T) { 47485d484e8cf710207010720589d89602233de61d01Sebastian Redl // C++ [expr.sizeof]p2: "When applied to a reference or a reference type, 47495d484e8cf710207010720589d89602233de61d01Sebastian Redl // the result is the size of the referenced type." 47505d484e8cf710207010720589d89602233de61d01Sebastian Redl // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the 47515d484e8cf710207010720589d89602233de61d01Sebastian Redl // result shall be the alignment of the referenced type." 47525d484e8cf710207010720589d89602233de61d01Sebastian Redl if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 47535d484e8cf710207010720589d89602233de61d01Sebastian Redl T = Ref->getPointeeType(); 47549f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier 47559f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier // __alignof is defined to return the preferred alignment. 47569f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier return Info.Ctx.toCharUnitsFromBits( 47579f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier Info.Ctx.getPreferredTypeAlign(T.getTypePtr())); 4758e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner} 4759e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 47608b752f10c394b140f9ef89e049cbad1a7676fc25Ken DyckCharUnits IntExprEvaluator::GetAlignOfExpr(const Expr *E) { 4761af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner E = E->IgnoreParens(); 4762af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner 4763af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner // alignof decl is always accepted, even if it doesn't make sense: we default 47641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // to 1 in those cases. 4765af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) 47668b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck return Info.Ctx.getDeclAlign(DRE->getDecl(), 47678b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck /*RefAsPointee*/true); 4768a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4769af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) 47708b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck return Info.Ctx.getDeclAlign(ME->getMemberDecl(), 47718b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck /*RefAsPointee*/true); 4772af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner 4773e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner return GetAlignOfType(E->getType()); 4774e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner} 4775e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 4776e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 4777f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne/// VisitUnaryExprOrTypeTraitExpr - Evaluate a sizeof, alignof or vec_step with 4778f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne/// a result as the expression's type. 4779f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbournebool IntExprEvaluator::VisitUnaryExprOrTypeTraitExpr( 4780f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne const UnaryExprOrTypeTraitExpr *E) { 4781f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne switch(E->getKind()) { 4782f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_AlignOf: { 4783e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner if (E->isArgumentType()) 47844f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(GetAlignOfType(E->getArgumentType()), E); 4785e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner else 47864f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(GetAlignOfExpr(E->getArgumentExpr()), E); 4787e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner } 4788a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4789f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_VecStep: { 4790f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne QualType Ty = E->getTypeOfArgument(); 47910518999d3adcc289997bd974dce90cc97f5c1c44Sebastian Redl 4792f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (Ty->isVectorType()) { 4793f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne unsigned n = Ty->getAs<VectorType>()->getNumElements(); 4794a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4795f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // The vec_step built-in functions that take a 3-component 4796f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // vector return 4. (OpenCL 1.1 spec 6.11.12) 4797f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (n == 3) 4798f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne n = 4; 4799f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 4800f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return Success(n, E); 4801f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } else 4802f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return Success(1, E); 4803f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 4804f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 4805f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_SizeOf: { 4806f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne QualType SrcTy = E->getTypeOfArgument(); 4807f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // C++ [expr.sizeof]p2: "When applied to a reference or a reference type, 4808f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // the result is the size of the referenced type." 4809f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the 4810f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // result shall be the alignment of the referenced type." 4811f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (const ReferenceType *Ref = SrcTy->getAs<ReferenceType>()) 4812f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne SrcTy = Ref->getPointeeType(); 4813f2da9dfef96dc11b7b5effb1d02cb427b2d71599Eli Friedman 4814180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits Sizeof; 4815180f47959a066795cc0f409433023af448bb0328Richard Smith if (!HandleSizeof(Info, SrcTy, Sizeof)) 4816f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return false; 4817180f47959a066795cc0f409433023af448bb0328Richard Smith return Success(Sizeof, E); 4818f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 4819f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 4820f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 4821f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne llvm_unreachable("unknown expr/type trait"); 4822fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattner} 4823fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattner 48248cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitOffsetOfExpr(const OffsetOfExpr *OOE) { 48258ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CharUnits Result; 48268cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne unsigned n = OOE->getNumComponents(); 48278ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (n == 0) 4828f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 48298cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne QualType CurrentType = OOE->getTypeSourceInfo()->getType(); 48308ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor for (unsigned i = 0; i != n; ++i) { 48318ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor OffsetOfExpr::OffsetOfNode ON = OOE->getComponent(i); 48328ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor switch (ON.getKind()) { 48338ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Array: { 48348cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr *Idx = OOE->getIndexExpr(ON.getArrayExprIndex()); 48358ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor APSInt IdxResult; 48368ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (!EvaluateInteger(Idx, IdxResult, Info)) 48378ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor return false; 48388ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const ArrayType *AT = Info.Ctx.getAsArrayType(CurrentType); 48398ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (!AT) 4840f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 48418ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CurrentType = AT->getElementType(); 48428ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CharUnits ElementSize = Info.Ctx.getTypeSizeInChars(CurrentType); 48438ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor Result += IdxResult.getSExtValue() * ElementSize; 48448ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor break; 48458ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 4846f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 48478ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Field: { 48488ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor FieldDecl *MemberDecl = ON.getField(); 48498ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const RecordType *RT = CurrentType->getAs<RecordType>(); 4850f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!RT) 4851f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 48528ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor RecordDecl *RD = RT->getDecl(); 48538ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); 4854ba4f5d5754c8291690d01ca9581926673d69b24cJohn McCall unsigned i = MemberDecl->getFieldIndex(); 4855cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor assert(i < RL.getFieldCount() && "offsetof field in wrong type"); 4856fb1e3bc29b667f4275e1d5a43d64ec173f4f9a7dKen Dyck Result += Info.Ctx.toCharUnitsFromBits(RL.getFieldOffset(i)); 48578ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CurrentType = MemberDecl->getType().getNonReferenceType(); 48588ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor break; 48598ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 4860f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 48618ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Identifier: 48628ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor llvm_unreachable("dependent __builtin_offsetof"); 4863f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 4864cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor case OffsetOfExpr::OffsetOfNode::Base: { 4865cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor CXXBaseSpecifier *BaseSpec = ON.getBase(); 4866cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor if (BaseSpec->isVirtual()) 4867f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 4868cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 4869cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Find the layout of the class whose base we are looking into. 4870cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const RecordType *RT = CurrentType->getAs<RecordType>(); 4871f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!RT) 4872f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 4873cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor RecordDecl *RD = RT->getDecl(); 4874cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); 4875cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 4876cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Find the base class itself. 4877cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor CurrentType = BaseSpec->getType(); 4878cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const RecordType *BaseRT = CurrentType->getAs<RecordType>(); 4879cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor if (!BaseRT) 4880f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 4881cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 4882cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Add the offset to the base. 48837c7f820d70c925b29290a8563b59615816a827fcKen Dyck Result += RL.getBaseClassOffset(cast<CXXRecordDecl>(BaseRT->getDecl())); 4884cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor break; 4885cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor } 48868ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 48878ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 48888cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return Success(Result, OOE); 48898ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor} 48908ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor 4891b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattnerbool IntExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 489275a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner switch (E->getOpcode()) { 48934c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner default: 489475a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner // Address, indirect, pre/post inc/dec, etc are not valid constant exprs. 489575a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner // See C99 6.6p3. 4896f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 48972de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Extension: 48984c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // FIXME: Should extension allow i-c-e extension expressions in its scope? 48994c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // If so, we could clear the diagnostic ID. 4900f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Visit(E->getSubExpr()); 49012de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 4902c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // The result is just the value. 4903f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Visit(E->getSubExpr()); 4904f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_Minus: { 4905f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Visit(E->getSubExpr())) 4906f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4907f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Result.isInt()) return Error(E); 4908789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith const APSInt &Value = Result.getInt(); 4909789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Value.isSigned() && Value.isMinSignedValue()) 4910789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith HandleOverflow(Info, E, -Value.extend(Value.getBitWidth() + 1), 4911789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith E->getType()); 4912789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return Success(-Value, E); 4913f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 4914f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_Not: { 4915f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Visit(E->getSubExpr())) 4916f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4917f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Result.isInt()) return Error(E); 4918f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(~Result.getInt(), E); 4919f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 4920f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_LNot: { 4921f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool bres; 4922f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateAsBooleanCondition(E->getSubExpr(), bres, Info)) 4923f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4924f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(!bres, E); 4925f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 492606a3675627e3b3c47b49c689c8e404a33144194aAnders Carlsson } 4927a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 49281eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4929732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner/// HandleCast - This is used to evaluate implicit or explicit casts where the 4930732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner/// result type is integer. 49318cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitCastExpr(const CastExpr *E) { 49328cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr *SubExpr = E->getSubExpr(); 493382206e267ce6cc709797127616f64672d255b310Anders Carlsson QualType DestType = E->getType(); 4934b92dac8bc2f6f73919825f9af693a8a7e89ae1d4Daniel Dunbar QualType SrcType = SubExpr->getType(); 493582206e267ce6cc709797127616f64672d255b310Anders Carlsson 493646a523285928aa07bf14803178dc04616ac85994Eli Friedman switch (E->getCastKind()) { 493746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_BaseToDerived: 493846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_DerivedToBase: 493946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_UncheckedDerivedToBase: 494046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_Dynamic: 494146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ToUnion: 494246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ArrayToPointerDecay: 494346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FunctionToPointerDecay: 494446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NullToPointer: 494546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NullToMemberPointer: 494646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_BaseToDerivedMemberPointer: 494746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_DerivedToBaseMemberPointer: 494846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ConstructorConversion: 494946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToPointer: 495046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ToVoid: 495146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_VectorSplat: 495246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToFloating: 495346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingCast: 49541d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 49551d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 495646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_AnyPointerToBlockPointerCast: 495746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ObjCObjectLValueCast: 495846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingRealToComplex: 495946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToReal: 496046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexCast: 496146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToIntegralComplex: 496246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralRealToComplex: 496346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexCast: 496446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToFloatingComplex: 496546a523285928aa07bf14803178dc04616ac85994Eli Friedman llvm_unreachable("invalid cast kind for integral value"); 496646a523285928aa07bf14803178dc04616ac85994Eli Friedman 4967e50c297f92914ca996deb8b597624193273b62e4Eli Friedman case CK_BitCast: 496846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_Dependent: 496946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueBitCast: 497033e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 497133e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 497233e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 497333e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: 4974f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 497546a523285928aa07bf14803178dc04616ac85994Eli Friedman 49767d580a4e9e47dffc3c17aa2b957ac57ca3c4e451Richard Smith case CK_UserDefinedConversion: 497746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueToRValue: 49787a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 49797a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 498046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NoOp: 4981c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 498246a523285928aa07bf14803178dc04616ac85994Eli Friedman 498346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_MemberPointerToBoolean: 498446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_PointerToBoolean: 498546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToBoolean: 498646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingToBoolean: 498746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToBoolean: 498846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToBoolean: { 49894efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman bool BoolResult; 4990c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateAsBooleanCondition(SubExpr, BoolResult, Info)) 49914efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman return false; 4992131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(BoolResult, E); 49934efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 49944efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 499546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralCast: { 4996732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner if (!Visit(SubExpr)) 4997b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner return false; 4998a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 4999be26570e3faa009bdcefedfaf04473e518940520Eli Friedman if (!Result.isInt()) { 500065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Allow casts of address-of-label differences if they are no-ops 500165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // or narrowing. (The narrowing case isn't actually guaranteed to 500265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // be constant-evaluatable except in some narrow cases which are hard 500365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // to detect here. We let it through on the assumption the user knows 500465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // what they are doing.) 500565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (Result.isAddrLabelDiff()) 500665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return Info.Ctx.getTypeSize(DestType) <= Info.Ctx.getTypeSize(SrcType); 5007be26570e3faa009bdcefedfaf04473e518940520Eli Friedman // Only allow casts of lvalues if they are lossless. 5008be26570e3faa009bdcefedfaf04473e518940520Eli Friedman return Info.Ctx.getTypeSize(DestType) == Info.Ctx.getTypeSize(SrcType); 5009be26570e3faa009bdcefedfaf04473e518940520Eli Friedman } 501030c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar 5011f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith return Success(HandleIntToIntCast(Info, E, DestType, SrcType, 5012f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.getInt()), E); 5013732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner } 50141eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 501546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_PointerToIntegral: { 5016c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 5017c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 5018efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 501987eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner if (!EvaluatePointer(SubExpr, LV, Info)) 5020b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner return false; 50214efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5022dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar if (LV.getLValueBase()) { 5023dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar // Only allow based lvalue casts if they are lossless. 5024f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // FIXME: Allow a larger integer size than the pointer size, and allow 5025f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // narrowing back down to pointer width in subsequent integral casts. 5026f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // FIXME: Check integer type's active bits, not its type size. 5027dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar if (Info.Ctx.getTypeSize(DestType) != Info.Ctx.getTypeSize(SrcType)) 5028f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5029dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar 5030b755a9da095d2f2f04444797f1e1a9511693815bRichard Smith LV.Designator.setInvalid(); 5031efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LV.moveInto(Result); 5032dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar return true; 5033dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar } 50344efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5035a73058324197b7bdfd19307965954f626e26199dKen Dyck APSInt AsInt = Info.Ctx.MakeIntValue(LV.getLValueOffset().getQuantity(), 5036a73058324197b7bdfd19307965954f626e26199dKen Dyck SrcType); 5037f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith return Success(HandleIntToIntCast(Info, E, DestType, SrcType, AsInt), E); 50382bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson } 50394efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 504046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToReal: { 5041f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue C; 50421725f683432715e5afe34d476024bd6f16eac3fcEli Friedman if (!EvaluateComplex(SubExpr, C, Info)) 50431725f683432715e5afe34d476024bd6f16eac3fcEli Friedman return false; 504446a523285928aa07bf14803178dc04616ac85994Eli Friedman return Success(C.getComplexIntReal(), E); 50451725f683432715e5afe34d476024bd6f16eac3fcEli Friedman } 50462217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman 504746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingToIntegral: { 504846a523285928aa07bf14803178dc04616ac85994Eli Friedman APFloat F(0.0); 504946a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateFloat(SubExpr, F, Info)) 505046a523285928aa07bf14803178dc04616ac85994Eli Friedman return false; 5051732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner 5052c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APSInt Value; 5053c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!HandleFloatToIntCast(Info, E, SrcType, F, DestType, Value)) 5054c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 5055c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return Success(Value, E); 505646a523285928aa07bf14803178dc04616ac85994Eli Friedman } 505746a523285928aa07bf14803178dc04616ac85994Eli Friedman } 50581eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 505946a523285928aa07bf14803178dc04616ac85994Eli Friedman llvm_unreachable("unknown cast resulting in integral value"); 5060a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 50612bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 5062722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedmanbool IntExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 5063722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 5064f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LV; 5065f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateComplex(E->getSubExpr(), LV, Info)) 5066f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5067f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LV.isComplexInt()) 5068f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5069722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Success(LV.getComplexIntReal(), E); 5070722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman } 5071722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 5072722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Visit(E->getSubExpr()); 5073722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman} 5074722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 5075664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedmanbool IntExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 5076722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman if (E->getSubExpr()->getType()->isComplexIntegerType()) { 5077f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LV; 5078f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateComplex(E->getSubExpr(), LV, Info)) 5079f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5080f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LV.isComplexInt()) 5081f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5082722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Success(LV.getComplexIntImag(), E); 5083722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman } 5084722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 50858327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 5086664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman return Success(0, E); 5087664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman} 5088664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 5089ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregorbool IntExprEvaluator::VisitSizeOfPackExpr(const SizeOfPackExpr *E) { 5090ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor return Success(E->getPackLength(), E); 5091ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor} 5092ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor 5093295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redlbool IntExprEvaluator::VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) { 5094295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl return Success(E->getValue(), E); 5095295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl} 5096295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl 5097f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 5098d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman// Float Evaluation 5099d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman//===----------------------------------------------------------------------===// 5100d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5101d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmannamespace { 5102770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass FloatExprEvaluator 51038cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<FloatExprEvaluator, bool> { 5104d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman APFloat &Result; 5105d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanpublic: 5106d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman FloatExprEvaluator(EvalInfo &info, APFloat &result) 51078cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(result) {} 5108d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 510947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith bool Success(const CCValue &V, const Expr *e) { 51108cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result = V.getFloat(); 51118cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 51128cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 5113d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 511451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 5115f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith Result = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(E->getType())); 5116f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith return true; 5117f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 5118f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 5119019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner bool VisitCallExpr(const CallExpr *E); 5120d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 51215db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar bool VisitUnaryOperator(const UnaryOperator *E); 5122d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman bool VisitBinaryOperator(const BinaryOperator *E); 5123d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman bool VisitFloatingLiteral(const FloatingLiteral *E); 51248cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E); 51252217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman 5126abd3a857ace59100305790545d1baae5877b8945John McCall bool VisitUnaryReal(const UnaryOperator *E); 5127abd3a857ace59100305790545d1baae5877b8945John McCall bool VisitUnaryImag(const UnaryOperator *E); 5128ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman 512951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // FIXME: Missing: array subscript of vector, member of vector 5130d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman}; 5131d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} // end anonymous namespace 5132d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5133d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanstatic bool EvaluateFloat(const Expr* E, APFloat& Result, EvalInfo &Info) { 5134c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isRealFloatingType()); 51358cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return FloatExprEvaluator(Info, Result).Visit(E); 5136d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5137d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 51384ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadstatic bool TryEvaluateBuiltinNaN(const ASTContext &Context, 5139db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall QualType ResultTy, 5140db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const Expr *Arg, 5141db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall bool SNaN, 5142db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall llvm::APFloat &Result) { 5143db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const StringLiteral *S = dyn_cast<StringLiteral>(Arg->IgnoreParenCasts()); 5144db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (!S) return false; 5145db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5146db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const llvm::fltSemantics &Sem = Context.getFloatTypeSemantics(ResultTy); 5147db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5148db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall llvm::APInt fill; 5149db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5150db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall // Treat empty strings as if they were zero. 5151db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (S->getString().empty()) 5152db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall fill = llvm::APInt(32, 0); 5153db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall else if (S->getString().getAsInteger(0, fill)) 5154db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall return false; 5155db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5156db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (SNaN) 5157db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall Result = llvm::APFloat::getSNaN(Sem, false, &fill); 5158db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall else 5159db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall Result = llvm::APFloat::getQNaN(Sem, false, &fill); 5160db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall return true; 5161db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall} 5162db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5163019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattnerbool FloatExprEvaluator::VisitCallExpr(const CallExpr *E) { 5164180f47959a066795cc0f409433023af448bb0328Richard Smith switch (E->isBuiltinCall()) { 51658cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne default: 51668cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 51678cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 5168019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_val: 5169019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_valf: 5170019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_vall: 5171019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_inf: 5172019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_inff: 51737cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar case Builtin::BI__builtin_infl: { 51747cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar const llvm::fltSemantics &Sem = 51757cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar Info.Ctx.getFloatTypeSemantics(E->getType()); 517634a74ab81600a40c6324fd76adb724b803dfaf91Chris Lattner Result = llvm::APFloat::getInf(Sem); 517734a74ab81600a40c6324fd76adb724b803dfaf91Chris Lattner return true; 51787cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar } 51791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5180db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nans: 5181db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nansf: 5182db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nansl: 5183f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), 5184f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith true, Result)) 5185f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5186f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 5187db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 51889e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nan: 51899e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nanf: 51909e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nanl: 51914572baba9d18c275968ac113fd73b0e3c77cccb8Mike Stump // If this is __builtin_nan() turn this into a nan, otherwise we 51929e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner // can't constant fold it. 5193f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), 5194f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith false, Result)) 5195f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5196f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 51975db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar 51985db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabs: 51995db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabsf: 52005db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabsl: 52015db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (!EvaluateFloat(E->getArg(0), Result, Info)) 52025db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return false; 52031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 52045db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (Result.isNegative()) 52055db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.changeSign(); 52065db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 52075db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar 52081eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Builtin::BI__builtin_copysign: 52091eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Builtin::BI__builtin_copysignf: 52105db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_copysignl: { 52115db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar APFloat RHS(0.); 52125db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (!EvaluateFloat(E->getArg(0), Result, Info) || 52135db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar !EvaluateFloat(E->getArg(1), RHS, Info)) 52145db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return false; 52155db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.copySign(RHS); 52165db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 52175db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar } 5218019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner } 5219019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner} 5220019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner 5221abd3a857ace59100305790545d1baae5877b8945John McCallbool FloatExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 522243efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 522343efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman ComplexValue CV; 522443efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (!EvaluateComplex(E->getSubExpr(), CV, Info)) 522543efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return false; 522643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = CV.FloatReal; 522743efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return true; 522843efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman } 522943efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman 523043efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return Visit(E->getSubExpr()); 5231abd3a857ace59100305790545d1baae5877b8945John McCall} 5232abd3a857ace59100305790545d1baae5877b8945John McCall 5233abd3a857ace59100305790545d1baae5877b8945John McCallbool FloatExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 523443efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 523543efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman ComplexValue CV; 523643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (!EvaluateComplex(E->getSubExpr(), CV, Info)) 523743efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return false; 523843efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = CV.FloatImag; 523943efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return true; 524043efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman } 524143efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman 52428327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 524343efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(E->getType()); 524443efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = llvm::APFloat::getZero(Sem); 5245abd3a857ace59100305790545d1baae5877b8945John McCall return true; 5246abd3a857ace59100305790545d1baae5877b8945John McCall} 5247abd3a857ace59100305790545d1baae5877b8945John McCall 52485db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbarbool FloatExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 52495db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar switch (E->getOpcode()) { 5250f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 52512de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 52527993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith return EvaluateFloat(E->getSubExpr(), Result, Info); 52532de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Minus: 52547993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith if (!EvaluateFloat(E->getSubExpr(), Result, Info)) 52557993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith return false; 52565db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.changeSign(); 52575db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 52585db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar } 52595db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar} 5260019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner 5261d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanbool FloatExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 5262e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) 5263e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 526496e93660124c8028a4c3bcc038ab0cdd18cd7ab2Anders Carlsson 52655db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar APFloat RHS(0.0); 5266745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateFloat(E->getLHS(), Result, Info); 5267745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 5268d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return false; 5269745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateFloat(E->getRHS(), RHS, Info) || !LHSOK) 5270d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return false; 5271d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5272d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman switch (E->getOpcode()) { 5273f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 52742de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 5275d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.multiply(RHS, APFloat::rmNearestTiesToEven); 52767b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 52772de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 5278d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.add(RHS, APFloat::rmNearestTiesToEven); 52797b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 52802de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 5281d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.subtract(RHS, APFloat::rmNearestTiesToEven); 52827b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 52832de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 5284d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.divide(RHS, APFloat::rmNearestTiesToEven); 52857b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 5286d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman } 52877b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 52887b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (Result.isInfinity() || Result.isNaN()) 52897b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith CCEDiag(E, diag::note_constexpr_float_arithmetic) << Result.isNaN(); 52907b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return true; 5291d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5292d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5293d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanbool FloatExprEvaluator::VisitFloatingLiteral(const FloatingLiteral *E) { 5294d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result = E->getValue(); 5295d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return true; 5296d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5297d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 52988cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool FloatExprEvaluator::VisitCastExpr(const CastExpr *E) { 52998cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 53001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 53012a523eec6a31955be876625819b89e8dc5def707Eli Friedman switch (E->getCastKind()) { 53022a523eec6a31955be876625819b89e8dc5def707Eli Friedman default: 5303c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 53042a523eec6a31955be876625819b89e8dc5def707Eli Friedman 53052a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_IntegralToFloating: { 53064efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman APSInt IntResult; 5307c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return EvaluateInteger(SubExpr, IntResult, Info) && 5308c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleIntToFloatCast(Info, E, SubExpr->getType(), IntResult, 5309c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith E->getType(), Result); 53104efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 53112a523eec6a31955be876625819b89e8dc5def707Eli Friedman 53122a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_FloatingCast: { 53134efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman if (!Visit(SubExpr)) 53144efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman return false; 5315c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToFloatCast(Info, E, SubExpr->getType(), E->getType(), 5316c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result); 53174efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 5318f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall 53192a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_FloatingComplexToReal: { 5320f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall ComplexValue V; 5321f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall if (!EvaluateComplex(SubExpr, V, Info)) 5322f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall return false; 5323f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall Result = V.getComplexFloatReal(); 5324f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall return true; 5325f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall } 53262a523eec6a31955be876625819b89e8dc5def707Eli Friedman } 53274efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 53284efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5329d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman//===----------------------------------------------------------------------===// 5330a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar// Complex Evaluation (for float and integer) 53319ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson//===----------------------------------------------------------------------===// 53329ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 53339ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlssonnamespace { 5334770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass ComplexExprEvaluator 53358cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<ComplexExprEvaluator, bool> { 5336f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue &Result; 53371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 53389ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlssonpublic: 5339f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexExprEvaluator(EvalInfo &info, ComplexValue &Result) 53408cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(Result) {} 53411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 534247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith bool Success(const CCValue &V, const Expr *e) { 53438cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result.setFrom(V); 53448cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 53458cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 53461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 53477ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman bool ZeroInitialization(const Expr *E); 53487ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 53498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 53508cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne // Visitor Methods 53518cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 53529ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 53538cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitImaginaryLiteral(const ImaginaryLiteral *E); 53548cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E); 5355b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman bool VisitBinaryOperator(const BinaryOperator *E); 535696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara bool VisitUnaryOperator(const UnaryOperator *E); 53577ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman bool VisitInitListExpr(const InitListExpr *E); 5358b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman}; 5359b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} // end anonymous namespace 53601eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5361b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedmanstatic bool EvaluateComplex(const Expr *E, ComplexValue &Result, 5362b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman EvalInfo &Info) { 5363c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isAnyComplexType()); 53648cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ComplexExprEvaluator(Info, Result).Visit(E); 5365b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} 5366b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 53677ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedmanbool ComplexExprEvaluator::ZeroInitialization(const Expr *E) { 5368f6c17a439f3320ac620639a3ee66dbdabb93810cEli Friedman QualType ElemTy = E->getType()->getAs<ComplexType>()->getElementType(); 53697ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (ElemTy->isRealFloatingType()) { 53707ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexFloat(); 53717ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman APFloat Zero = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(ElemTy)); 53727ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.FloatReal = Zero; 53737ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.FloatImag = Zero; 53747ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } else { 53757ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexInt(); 53767ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman APSInt Zero = Info.Ctx.MakeIntValue(0, ElemTy); 53777ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.IntReal = Zero; 53787ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.IntImag = Zero; 53797ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 53807ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return true; 53817ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman} 53827ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 53838cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool ComplexExprEvaluator::VisitImaginaryLiteral(const ImaginaryLiteral *E) { 53848cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 5385b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5386b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (SubExpr->getType()->isRealFloatingType()) { 5387b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.makeComplexFloat(); 5388b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APFloat &Imag = Result.FloatImag; 5389b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (!EvaluateFloat(SubExpr, Imag, Info)) 5390b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5391b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5392b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.FloatReal = APFloat(Imag.getSemantics()); 5393b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return true; 5394b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman } else { 5395b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman assert(SubExpr->getType()->isIntegerType() && 5396b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman "Unexpected imaginary literal."); 5397b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5398b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.makeComplexInt(); 5399b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APSInt &Imag = Result.IntImag; 5400b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (!EvaluateInteger(SubExpr, Imag, Info)) 5401b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5402b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5403b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.IntReal = APSInt(Imag.getBitWidth(), !Imag.isSigned()); 5404b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return true; 5405b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman } 5406b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} 5407b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 54088cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool ComplexExprEvaluator::VisitCastExpr(const CastExpr *E) { 5409b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 54108786da77984e81d48e0e1b2bd339809b1efc19f3John McCall switch (E->getCastKind()) { 54118786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BitCast: 54128786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BaseToDerived: 54138786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_DerivedToBase: 54148786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_UncheckedDerivedToBase: 54158786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_Dynamic: 54168786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ToUnion: 54178786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ArrayToPointerDecay: 54188786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FunctionToPointerDecay: 54198786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NullToPointer: 54208786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NullToMemberPointer: 54218786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BaseToDerivedMemberPointer: 54228786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_DerivedToBaseMemberPointer: 54238786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_MemberPointerToBoolean: 54248786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ConstructorConversion: 54258786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToPointer: 54268786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_PointerToIntegral: 54278786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_PointerToBoolean: 54288786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ToVoid: 54298786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_VectorSplat: 54308786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralCast: 54318786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToBoolean: 54328786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToFloating: 54338786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingToIntegral: 54348786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingToBoolean: 54358786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingCast: 54361d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 54371d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 54388786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_AnyPointerToBlockPointerCast: 54398786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ObjCObjectLValueCast: 54408786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToReal: 54418786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToBoolean: 54428786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToReal: 54438786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToBoolean: 544433e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 544533e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 544633e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 544733e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: 54488786da77984e81d48e0e1b2bd339809b1efc19f3John McCall llvm_unreachable("invalid cast kind for complex value"); 54498786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 54508786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_LValueToRValue: 54517a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 54527a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 54538786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NoOp: 5454c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 54552bb5d00fcf71a7b4d478d478be778fff0494aff6John McCall 54568786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_Dependent: 545746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueBitCast: 54588786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_UserDefinedConversion: 5459f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 54608786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 54618786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingRealToComplex: { 5462b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APFloat &Real = Result.FloatReal; 54638786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!EvaluateFloat(E->getSubExpr(), Real, Info)) 5464b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5465b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 54668786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexFloat(); 54678786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.FloatImag = APFloat(Real.getSemantics()); 54688786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 54698786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 54708786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 54718786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexCast: { 54728786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 54738786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 54748786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 54758786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 54768786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 54778786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 54788786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 5479c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToFloatCast(Info, E, From, To, Result.FloatReal) && 5480c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleFloatToFloatCast(Info, E, From, To, Result.FloatImag); 54818786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 54828786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 54838786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToIntegralComplex: { 54848786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 54858786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 54868786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 54878786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 54888786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 54898786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 54908786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexInt(); 5491c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToIntCast(Info, E, From, Result.FloatReal, 5492c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.IntReal) && 5493c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleFloatToIntCast(Info, E, From, Result.FloatImag, 5494c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.IntImag); 54958786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 54968786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 54978786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralRealToComplex: { 5498b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APSInt &Real = Result.IntReal; 54998786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!EvaluateInteger(E->getSubExpr(), Real, Info)) 5500b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 55019ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 55028786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexInt(); 55038786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.IntImag = APSInt(Real.getBitWidth(), !Real.isSigned()); 55048786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 55058786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 55068786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 55078786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexCast: { 55088786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 5509b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5510ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 55118786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 55128786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 55138786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 55141725f683432715e5afe34d476024bd6f16eac3fcEli Friedman 5515f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.IntReal = HandleIntToIntCast(Info, E, To, From, Result.IntReal); 5516f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.IntImag = HandleIntToIntCast(Info, E, To, From, Result.IntImag); 55178786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 55188786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 55198786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 55208786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToFloatingComplex: { 55218786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 55228786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 55238786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 55248786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 55258786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 55268786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 55278786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexFloat(); 5528c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleIntToFloatCast(Info, E, From, Result.IntReal, 5529c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.FloatReal) && 5530c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleIntToFloatCast(Info, E, From, Result.IntImag, 5531c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.FloatImag); 55328786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 5533ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson } 55341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 55358786da77984e81d48e0e1b2bd339809b1efc19f3John McCall llvm_unreachable("unknown cast resulting in complex value"); 55369ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson} 55379ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 5538f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCallbool ComplexExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 5539e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) 55402ad226bdc847df6b6b6e4f832856478ab63bb3dcRichard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 55412ad226bdc847df6b6b6e4f832856478ab63bb3dcRichard Smith 5542745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = Visit(E->getLHS()); 5543745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 5544f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return false; 55451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5546f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue RHS; 5547745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK) 5548f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return false; 5549a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar 55503f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar assert(Result.isComplexFloat() == RHS.isComplexFloat() && 55513f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar "Invalid operands to binary operator."); 5552ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson switch (E->getOpcode()) { 5553f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 55542de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 5555a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar if (Result.isComplexFloat()) { 5556a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatReal().add(RHS.getComplexFloatReal(), 5557a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5558a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatImag().add(RHS.getComplexFloatImag(), 5559a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5560a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } else { 5561a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntReal() += RHS.getComplexIntReal(); 5562a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntImag() += RHS.getComplexIntImag(); 5563a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } 55643f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 55652de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 5566a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar if (Result.isComplexFloat()) { 5567a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatReal().subtract(RHS.getComplexFloatReal(), 5568a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5569a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatImag().subtract(RHS.getComplexFloatImag(), 5570a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5571a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } else { 5572a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntReal() -= RHS.getComplexIntReal(); 5573a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntImag() -= RHS.getComplexIntImag(); 5574a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } 55753f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 55762de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 55773f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar if (Result.isComplexFloat()) { 5578f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS = Result; 55793f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &LHS_r = LHS.getComplexFloatReal(); 55803f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &LHS_i = LHS.getComplexFloatImag(); 55813f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &RHS_r = RHS.getComplexFloatReal(); 55823f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &RHS_i = RHS.getComplexFloatImag(); 55831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 55843f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat Tmp = LHS_r; 55853f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_r, APFloat::rmNearestTiesToEven); 55863f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatReal() = Tmp; 55873f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_i; 55883f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 55893f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatReal().subtract(Tmp, APFloat::rmNearestTiesToEven); 55903f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar 55913f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_r; 55923f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 55933f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatImag() = Tmp; 55943f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_i; 55953f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_r, APFloat::rmNearestTiesToEven); 55963f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatImag().add(Tmp, APFloat::rmNearestTiesToEven); 55973f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar } else { 5598f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS = Result; 55991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Result.getComplexIntReal() = 56003f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar (LHS.getComplexIntReal() * RHS.getComplexIntReal() - 56013f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar LHS.getComplexIntImag() * RHS.getComplexIntImag()); 56021eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Result.getComplexIntImag() = 56033f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar (LHS.getComplexIntReal() * RHS.getComplexIntImag() + 56043f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar LHS.getComplexIntImag() * RHS.getComplexIntReal()); 56053f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar } 56063f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 560796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case BO_Div: 560896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) { 560996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara ComplexValue LHS = Result; 561096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &LHS_r = LHS.getComplexFloatReal(); 561196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &LHS_i = LHS.getComplexFloatImag(); 561296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &RHS_r = RHS.getComplexFloatReal(); 561396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &RHS_i = RHS.getComplexFloatImag(); 561496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &Res_r = Result.getComplexFloatReal(); 561596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &Res_i = Result.getComplexFloatImag(); 561696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 561796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat Den = RHS_r; 561896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Den.multiply(RHS_r, APFloat::rmNearestTiesToEven); 561996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat Tmp = RHS_i; 562096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 562196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Den.add(Tmp, APFloat::rmNearestTiesToEven); 562296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 562396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r = LHS_r; 562496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.multiply(RHS_r, APFloat::rmNearestTiesToEven); 562596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp = LHS_i; 562696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 562796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.add(Tmp, APFloat::rmNearestTiesToEven); 562896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.divide(Den, APFloat::rmNearestTiesToEven); 562996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 563096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i = LHS_i; 563196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.multiply(RHS_r, APFloat::rmNearestTiesToEven); 563296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp = LHS_r; 563396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 563496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.subtract(Tmp, APFloat::rmNearestTiesToEven); 563596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.divide(Den, APFloat::rmNearestTiesToEven); 563696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } else { 5637f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (RHS.getComplexIntReal() == 0 && RHS.getComplexIntImag() == 0) 5638f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_expr_divide_by_zero); 5639f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 564096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara ComplexValue LHS = Result; 564196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APSInt Den = RHS.getComplexIntReal() * RHS.getComplexIntReal() + 564296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara RHS.getComplexIntImag() * RHS.getComplexIntImag(); 564396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntReal() = 564496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara (LHS.getComplexIntReal() * RHS.getComplexIntReal() + 564596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara LHS.getComplexIntImag() * RHS.getComplexIntImag()) / Den; 564696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = 564796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara (LHS.getComplexIntImag() * RHS.getComplexIntReal() - 564896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara LHS.getComplexIntReal() * RHS.getComplexIntImag()) / Den; 564996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 565096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara break; 5651ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson } 5652ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 5653f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return true; 5654ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson} 5655ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 565696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnarabool ComplexExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 565796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara // Get the operand value into 'Result'. 565896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (!Visit(E->getSubExpr())) 565996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return false; 566096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 566196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara switch (E->getOpcode()) { 566296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara default: 5663f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 566496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Extension: 566596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 566696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Plus: 566796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara // The result is always just the subexpr. 566896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 566996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Minus: 567096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) { 567196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatReal().changeSign(); 567296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatImag().changeSign(); 567396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 567496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara else { 567596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntReal() = -Result.getComplexIntReal(); 567696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = -Result.getComplexIntImag(); 567796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 567896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 567996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Not: 568096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) 568196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatImag().changeSign(); 568296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara else 568396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = -Result.getComplexIntImag(); 568496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 568596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 568696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara} 568796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 56887ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedmanbool ComplexExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 56897ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (E->getNumInits() == 2) { 56907ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (E->getType()->isComplexType()) { 56917ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexFloat(); 56927ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateFloat(E->getInit(0), Result.FloatReal, Info)) 56937ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 56947ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateFloat(E->getInit(1), Result.FloatImag, Info)) 56957ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 56967ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } else { 56977ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexInt(); 56987ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateInteger(E->getInit(0), Result.IntReal, Info)) 56997ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 57007ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateInteger(E->getInit(1), Result.IntImag, Info)) 57017ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 57027ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 57037ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return true; 57047ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 57057ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return ExprEvaluatorBaseTy::VisitInitListExpr(E); 57067ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman} 57077ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 57089ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson//===----------------------------------------------------------------------===// 5709aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith// Void expression evaluation, primarily for a cast to void on the LHS of a 5710aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith// comma operator 5711aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith//===----------------------------------------------------------------------===// 5712aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5713aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithnamespace { 5714aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithclass VoidExprEvaluator 5715aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith : public ExprEvaluatorBase<VoidExprEvaluator, bool> { 5716aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithpublic: 5717aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith VoidExprEvaluator(EvalInfo &Info) : ExprEvaluatorBaseTy(Info) {} 5718aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5719aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith bool Success(const CCValue &V, const Expr *e) { return true; } 5720aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5721aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith bool VisitCastExpr(const CastExpr *E) { 5722aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith switch (E->getCastKind()) { 5723aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith default: 5724aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 5725aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith case CK_ToVoid: 5726aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith VisitIgnoredValue(E->getSubExpr()); 5727aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return true; 5728aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } 5729aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } 5730aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith}; 5731aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith} // end anonymous namespace 5732aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5733aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithstatic bool EvaluateVoid(const Expr *E, EvalInfo &Info) { 5734aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith assert(E->isRValue() && E->getType()->isVoidType()); 5735aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return VoidExprEvaluator(Info).Visit(E); 5736aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith} 5737aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5738aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith//===----------------------------------------------------------------------===// 573951f4708c00110940ca3f337961915f2ca1668375Richard Smith// Top level Expr::EvaluateAsRValue method. 5740f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 5741f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 574247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smithstatic bool Evaluate(CCValue &Result, EvalInfo &Info, const Expr *E) { 5743c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C, function designators are not lvalues, but we evaluate them as if they 5744c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // are. 5745c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isGLValue() || E->getType()->isFunctionType()) { 5746c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LValue LV; 5747c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateLValue(E, LV, Info)) 5748c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 5749c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LV.moveInto(Result); 5750c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } else if (E->getType()->isVectorType()) { 57511e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!EvaluateVector(E, Result, Info)) 575259b5da6d853b4368b984700315adf7b37de05764Nate Begeman return false; 5753575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor } else if (E->getType()->isIntegralOrEnumerationType()) { 57541e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!IntExprEvaluator(Info, Result).Visit(E)) 57556dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 5756efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->hasPointerRepresentation()) { 5757efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 5758efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluatePointer(E, LV, Info)) 57596dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 57601e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith LV.moveInto(Result); 5761efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->isRealFloatingType()) { 5762efdb83e26f9a1fd2566afe54461216cd84814d42John McCall llvm::APFloat F(0.0); 5763efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateFloat(E, F, Info)) 57646dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 576547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = CCValue(F); 5766efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->isAnyComplexType()) { 5767efdb83e26f9a1fd2566afe54461216cd84814d42John McCall ComplexValue C; 5768efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateComplex(E, C, Info)) 5769660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return false; 57701e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith C.moveInto(Result); 577169c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith } else if (E->getType()->isMemberPointerType()) { 5772e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr P; 5773e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateMemberPointer(E, P, Info)) 5774e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 5775e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith P.moveInto(Result); 5776e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 577751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } else if (E->getType()->isArrayType()) { 5778180f47959a066795cc0f409433023af448bb0328Richard Smith LValue LV; 57791bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith LV.set(E, Info.CurrentCall); 5780180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArray(E, LV, Info.CurrentCall->Temporaries[E], Info)) 5781cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 5782180f47959a066795cc0f409433023af448bb0328Richard Smith Result = Info.CurrentCall->Temporaries[E]; 578351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } else if (E->getType()->isRecordType()) { 5784180f47959a066795cc0f409433023af448bb0328Richard Smith LValue LV; 57851bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith LV.set(E, Info.CurrentCall); 5786180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateRecord(E, LV, Info.CurrentCall->Temporaries[E], Info)) 5787180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 5788180f47959a066795cc0f409433023af448bb0328Richard Smith Result = Info.CurrentCall->Temporaries[E]; 5789aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } else if (E->getType()->isVoidType()) { 5790c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) 5791c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_nonliteral) 5792c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << E->getType(); 5793c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith else 5794c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 5795aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith if (!EvaluateVoid(E, Info)) 5796aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return false; 5797c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else if (Info.getLangOpts().CPlusPlus0x) { 5798c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_nonliteral) << E->getType(); 5799c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 5800f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } else { 5801dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 5802660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return false; 5803f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5804660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump 5805660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return true; 5806660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump} 5807660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump 580869c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith/// EvaluateConstantExpression - Evaluate an expression as a constant expression 580969c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith/// in-place in an APValue. In some cases, the in-place evaluation is essential, 581069c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith/// since later initializers for an object can indirectly refer to subobjects 581169c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith/// which were initialized earlier. 581269c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smithstatic bool EvaluateConstantExpression(APValue &Result, EvalInfo &Info, 5813c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const LValue &This, const Expr *E, 5814c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CheckConstantExpressionKind CCEK) { 581551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!CheckLiteralType(Info, E)) 581651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 581751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 581851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (E->isRValue()) { 581969c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // Evaluate arrays and record types in-place, so that later initializers can 582069c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // refer to earlier-initialized members of the object. 5821180f47959a066795cc0f409433023af448bb0328Richard Smith if (E->getType()->isArrayType()) 5822180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateArray(E, This, Result, Info); 5823180f47959a066795cc0f409433023af448bb0328Richard Smith else if (E->getType()->isRecordType()) 5824180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateRecord(E, This, Result, Info); 582569c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith } 582669c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 582769c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // For any other type, in-place evaluation is unimportant. 582869c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith CCValue CoreConstResult; 582969c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return Evaluate(CoreConstResult, Info, E) && 5830c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CheckConstantExpression(Info, E, CoreConstResult, Result, CCEK); 583169c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith} 583269c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 5833f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// EvaluateAsRValue - Try to evaluate this expression, performing an implicit 5834f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// lvalue-to-rvalue cast if it is an lvalue. 5835f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateAsRValue(EvalInfo &Info, const Expr *E, APValue &Result) { 583651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!CheckLiteralType(Info, E)) 583751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 583851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 5839f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith CCValue Value; 5840f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!::Evaluate(Value, Info, E)) 5841f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5842f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 5843f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (E->isGLValue()) { 5844f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith LValue LV; 5845f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith LV.setFrom(Value); 5846f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), LV, Value)) 5847f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5848f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5849f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 5850f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // Check this core constant expression is a constant expression, and if so, 5851f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // convert it to one. 5852f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return CheckConstantExpression(Info, E, Value, Result); 5853f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 5854c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 585551f4708c00110940ca3f337961915f2ca1668375Richard Smith/// EvaluateAsRValue - Return true if this is a constant which we can fold using 585656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall/// any crazy technique (that has nothing to do with language standards) that 585756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall/// we want to. If this function returns true, it returns the folded constant 5858c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// in Result. If this expression is a glvalue, an lvalue-to-rvalue conversion 5859c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// will be applied to the result. 586051f4708c00110940ca3f337961915f2ca1668375Richard Smithbool Expr::EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const { 5861ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith // Fast-path evaluations of integer literals, since we sometimes see files 5862ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith // containing vast quantities of these. 5863ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith if (const IntegerLiteral *L = dyn_cast<IntegerLiteral>(this)) { 5864ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith Result.Val = APValue(APSInt(L->getValue(), 5865ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith L->getType()->isUnsignedIntegerType())); 5866ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith return true; 5867ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith } 5868ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith 58692d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // FIXME: Evaluating values of large array and record types can cause 58702d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // performance problems. Only do so in C++11 for now. 5871e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isRValue() && (getType()->isArrayType() || getType()->isRecordType()) && 5872e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith !Ctx.getLangOptions().CPlusPlus0x) 58731445bbacf4c8de5f208ff4ccb302424a4d9e233eRichard Smith return false; 58741445bbacf4c8de5f208ff4ccb302424a4d9e233eRichard Smith 5875f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith EvalInfo Info(Ctx, Result); 5876f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ::EvaluateAsRValue(Info, this, Result.Val); 587756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall} 587856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 58794ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::EvaluateAsBooleanCondition(bool &Result, 58804ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foad const ASTContext &Ctx) const { 5881c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalResult Scratch; 588251f4708c00110940ca3f337961915f2ca1668375Richard Smith return EvaluateAsRValue(Scratch, Ctx) && 5883b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleConversionToBool(CCValue(const_cast<ASTContext&>(Ctx), 5884b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Scratch.Val, CCValue::GlobalValue()), 588547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result); 5886cd7a445c6b46c5585580dfb652300c8483c0cb6bJohn McCall} 5887cd7a445c6b46c5585580dfb652300c8483c0cb6bJohn McCall 588880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithbool Expr::EvaluateAsInt(APSInt &Result, const ASTContext &Ctx, 588980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith SideEffectsKind AllowSideEffects) const { 589080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!getType()->isIntegralOrEnumerationType()) 589180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 589280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 5893c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalResult ExprResult; 589480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!EvaluateAsRValue(ExprResult, Ctx) || !ExprResult.Val.isInt() || 589580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith (!AllowSideEffects && ExprResult.HasSideEffects)) 5896c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 5897f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 5898c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = ExprResult.Val.getInt(); 5899c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return true; 5900a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith} 5901a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith 59024ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const { 59031b78276a75a5a0f496a82429c1ff9604d622a76dAnders Carlsson EvalInfo Info(Ctx, Result); 59041b78276a75a5a0f496a82429c1ff9604d622a76dAnders Carlsson 5905efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 59069a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith return EvaluateLValue(this, LV, Info) && !Result.HasSideEffects && 5907c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CheckLValueConstantExpression(Info, this, LV, Result.Val, 5908c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_Constant); 5909b2f295c8050fb8c141bf2cf38eed0a56e99d0092Eli Friedman} 5910b2f295c8050fb8c141bf2cf38eed0a56e99d0092Eli Friedman 5911099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithbool Expr::EvaluateAsInitializer(APValue &Value, const ASTContext &Ctx, 5912099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const VarDecl *VD, 5913099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith llvm::SmallVectorImpl<PartialDiagnosticAt> &Notes) const { 59142d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // FIXME: Evaluating initializers for large array and record types can cause 59152d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // performance problems. Only do so in C++11 for now. 59162d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith if (isRValue() && (getType()->isArrayType() || getType()->isRecordType()) && 59172d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith !Ctx.getLangOptions().CPlusPlus0x) 59182d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith return false; 59192d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith 5920099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Expr::EvalStatus EStatus; 5921099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EStatus.Diag = &Notes; 5922099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 5923099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EvalInfo InitInfo(Ctx, EStatus); 5924099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith InitInfo.setEvaluatingDecl(VD, Value); 5925099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 592651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!CheckLiteralType(InitInfo, this)) 592751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 592851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 5929099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith LValue LVal; 5930099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith LVal.set(VD); 5931099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 593251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // C++11 [basic.start.init]p2: 593351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Variables with static storage duration or thread storage duration shall be 593451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // zero-initialized before any other initialization takes place. 593551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // This behavior is not present in C. 593651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (Ctx.getLangOptions().CPlusPlus && !VD->hasLocalStorage() && 593751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith !VD->getType()->isReferenceType()) { 593851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(VD->getType()); 593951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!EvaluateConstantExpression(Value, InitInfo, LVal, &VIE)) 594051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 594151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 594251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 5943099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return EvaluateConstantExpression(Value, InitInfo, LVal, this) && 5944099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith !EStatus.HasSideEffects; 5945099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith} 5946099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 594751f4708c00110940ca3f337961915f2ca1668375Richard Smith/// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 594851f4708c00110940ca3f337961915f2ca1668375Richard Smith/// constant folded, but discard the result. 59494ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::isEvaluatable(const ASTContext &Ctx) const { 59504fdfb0965b396f2778091f7e6c051d17ff9791baAnders Carlsson EvalResult Result; 595151f4708c00110940ca3f337961915f2ca1668375Richard Smith return EvaluateAsRValue(Result, Ctx) && !Result.HasSideEffects; 595245b6b9d080ac56917337d73d8f1cd6374b27b05dChris Lattner} 595351fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson 59544ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::HasSideEffects(const ASTContext &Ctx) const { 59551e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith return HasSideEffect(Ctx).Visit(this); 5956393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian} 5957393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian 5958a6b8b2c09610b8bc4330e948ece8b940c2386406Richard SmithAPSInt Expr::EvaluateKnownConstInt(const ASTContext &Ctx) const { 59591c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson EvalResult EvalResult; 596051f4708c00110940ca3f337961915f2ca1668375Richard Smith bool Result = EvaluateAsRValue(EvalResult, Ctx); 5961c6ed729f669044f5072a49d79041f455d971ece3Jeffrey Yasskin (void)Result; 596251fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson assert(Result && "Could not evaluate expression"); 59631c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson assert(EvalResult.Val.isInt() && "Expression did not evaluate to integer"); 596451fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson 59651c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson return EvalResult.Val.getInt(); 596651fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson} 5967d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5968e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara bool Expr::EvalResult::isGlobalLValue() const { 5969e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara assert(Val.isLValue()); 5970e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara return IsGlobalLValue(Val.getLValueBase()); 5971e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara } 5972e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara 5973e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara 5974d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// isIntegerConstantExpr - this recursive routine will test if an expression is 5975d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// an integer constant expression. 5976d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5977d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 5978d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// comma, etc 5979d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// 5980d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof 5981d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer 5982d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// cast+dereference. 5983d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5984d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// CheckICE - This function does the fundamental ICE checking: the returned 5985d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation. 5986d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// Note that to reduce code duplication, this helper does no evaluation 5987d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// itself; the caller checks whether the expression is evaluatable, and 5988d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// in the rare cases where CheckICE actually cares about the evaluated 5989d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// value, it calls into Evalute. 5990d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 5991d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// Meanings of Val: 599251f4708c00110940ca3f337961915f2ca1668375Richard Smith// 0: This expression is an ICE. 5993d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 1: This expression is not an ICE, but if it isn't evaluated, it's 5994d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// a legal subexpression for an ICE. This return value is used to handle 5995d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// the comma operator in C99 mode. 5996d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 2: This expression is not an ICE, and is not a legal subexpression for one. 5997d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 59983c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmannamespace { 59993c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 6000d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstruct ICEDiag { 6001d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall unsigned Val; 6002d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall SourceLocation Loc; 6003d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6004d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall public: 6005d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {} 6006d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag() : Val(0) {} 6007d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall}; 6008d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 60093c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman} 60103c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 60113c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmanstatic ICEDiag NoDiag() { return ICEDiag(); } 6012d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6013d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstatic ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) { 6014d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall Expr::EvalResult EVResult; 601551f4708c00110940ca3f337961915f2ca1668375Richard Smith if (!E->EvaluateAsRValue(EVResult, Ctx) || EVResult.HasSideEffects || 6016d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall !EVResult.Val.isInt()) { 6017d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6018d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6019d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6020d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 6021d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6022d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstatic ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) { 6023d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall assert(!E->isValueDependent() && "Should not see value dependent exprs!"); 60242ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor if (!E->getType()->isIntegralOrEnumerationType()) { 6025d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6026d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6027d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6028d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (E->getStmtClass()) { 602963c00d7f35fa060c0a446c9df3a4402d9c7757feJohn McCall#define ABSTRACT_STMT(Node) 6030d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#define STMT(Node, Base) case Expr::Node##Class: 6031d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#define EXPR(Node, Base) 6032d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#include "clang/AST/StmtNodes.inc" 6033d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::PredefinedExprClass: 6034d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::FloatingLiteralClass: 6035d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImaginaryLiteralClass: 6036d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::StringLiteralClass: 6037d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ArraySubscriptExprClass: 6038d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::MemberExprClass: 6039d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CompoundAssignOperatorClass: 6040d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CompoundLiteralExprClass: 6041d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ExtVectorElementExprClass: 6042d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DesignatedInitExprClass: 6043d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImplicitValueInitExprClass: 6044d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ParenListExprClass: 6045d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::VAArgExprClass: 6046d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::AddrLabelExprClass: 6047d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::StmtExprClass: 6048d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXMemberCallExprClass: 6049e08ce650a2b02410eddd1f60a4aa6b3d4be71e73Peter Collingbourne case Expr::CUDAKernelCallExprClass: 6050d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDynamicCastExprClass: 6051d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXTypeidExprClass: 60529be88403e965cc49af76c9d33d818781d44b333eFrancois Pichet case Expr::CXXUuidofExprClass: 6053d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXNullPtrLiteralExprClass: 6054d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXThisExprClass: 6055d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXThrowExprClass: 6056d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXNewExprClass: 6057d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDeleteExprClass: 6058d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXPseudoDestructorExprClass: 6059d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnresolvedLookupExprClass: 6060d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DependentScopeDeclRefExprClass: 6061d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXConstructExprClass: 6062d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXBindTemporaryExprClass: 60634765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall case Expr::ExprWithCleanupsClass: 6064d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXTemporaryObjectExprClass: 6065d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXUnresolvedConstructExprClass: 6066d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDependentScopeMemberExprClass: 6067d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnresolvedMemberExprClass: 6068d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCStringLiteralClass: 6069d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCEncodeExprClass: 6070d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCMessageExprClass: 6071d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCSelectorExprClass: 6072d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCProtocolExprClass: 6073d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCIvarRefExprClass: 6074d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCPropertyRefExprClass: 6075d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCIsaExprClass: 6076d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ShuffleVectorExprClass: 6077d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BlockExprClass: 6078d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BlockDeclRefExprClass: 6079d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::NoStmtClass: 60807cd7d1ad33fdf49eef83942e8855fe20d95aa1b9John McCall case Expr::OpaqueValueExprClass: 6081be230c36e32142cbdcdbe9c97511d097beeecbabDouglas Gregor case Expr::PackExpansionExprClass: 6082c7793c73ba8a343de3f2552d984851985a46f159Douglas Gregor case Expr::SubstNonTypeTemplateParmPackExprClass: 608361eee0ca33b29e102f11bab77c8b74cc00e2392bTanya Lattner case Expr::AsTypeExprClass: 6084f85e193739c953358c865005855253af4f68a497John McCall case Expr::ObjCIndirectCopyRestoreExprClass: 608503e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor case Expr::MaterializeTemporaryExprClass: 60864b9c2d235fb9449e249d74f48ecfec601650de93John McCall case Expr::PseudoObjectExprClass: 6087276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Expr::AtomicExprClass: 6088cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl case Expr::InitListExprClass: 6089cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl return ICEDiag(2, E->getLocStart()); 6090cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 6091ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor case Expr::SizeOfPackExprClass: 6092d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::GNUNullExprClass: 6093d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // GCC considers the GNU __null value to be an integral constant expression. 6094d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6095d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 609691a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall case Expr::SubstNonTypeTemplateParmExprClass: 609791a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall return 609891a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall CheckICE(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement(), Ctx); 609991a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall 6100d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ParenExprClass: 6101d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); 6102f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne case Expr::GenericSelectionExprClass: 6103f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne return CheckICE(cast<GenericSelectionExpr>(E)->getResultExpr(), Ctx); 6104d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::IntegerLiteralClass: 6105d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CharacterLiteralClass: 6106d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXBoolLiteralExprClass: 6107ed8abf18329df67b0abcbb3a10458bd8c1d2a595Douglas Gregor case Expr::CXXScalarValueInitExprClass: 6108d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnaryTypeTraitExprClass: 61096ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet case Expr::BinaryTypeTraitExprClass: 611021ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley case Expr::ArrayTypeTraitExprClass: 6111552622067dc45013d240f73952fece703f5e63bdJohn Wiegley case Expr::ExpressionTraitExprClass: 61122e156225a29407a50dd19041aa5750171ad44ea3Sebastian Redl case Expr::CXXNoexceptExprClass: 6113d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6114d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CallExprClass: 61156cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt case Expr::CXXOperatorCallExprClass: { 611605830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows function calls within unevaluated subexpressions of 611705830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // constant expressions, but they can never be ICEs because an ICE cannot 611805830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // contain an operand of (pointer to) function type. 6119d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const CallExpr *CE = cast<CallExpr>(E); 6120180f47959a066795cc0f409433023af448bb0328Richard Smith if (CE->isBuiltinCall()) 6121d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckEvalInICE(E, Ctx); 6122d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6123d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6124d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DeclRefExprClass: 6125d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) 6126d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 612703f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith if (Ctx.getLangOptions().CPlusPlus && IsConstNonVolatile(E->getType())) { 6128d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const NamedDecl *D = cast<DeclRefExpr>(E)->getDecl(); 6129d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6130d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Parameter variables are never constants. Without this check, 6131d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // getAnyInitializer() can find a default argument, which leads 6132d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // to chaos. 6133d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (isa<ParmVarDecl>(D)) 6134d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 6135d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6136d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // C++ 7.1.5.1p2 6137d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // A variable of non-volatile const-qualified integral or enumeration 6138d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // type initialized by an ICE can be used in ICEs. 6139d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (const VarDecl *Dcl = dyn_cast<VarDecl>(D)) { 6140db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith if (!Dcl->getType()->isIntegralOrEnumerationType()) 6141db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 6142db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith 6143099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const VarDecl *VD; 6144099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Look for a declaration of this variable that has an initializer, and 6145099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // check whether it is an ICE. 6146099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (Dcl->getAnyInitializer(VD) && VD->checkInitIsICE()) 6147099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return NoDiag(); 6148099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith else 6149099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 6150d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6151d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6152d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6153d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnaryOperatorClass: { 6154d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const UnaryOperator *Exp = cast<UnaryOperator>(E); 6155d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (Exp->getOpcode()) { 61562de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PostInc: 61572de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PostDec: 61582de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PreInc: 61592de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PreDec: 61602de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_AddrOf: 61612de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Deref: 616205830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows increment and decrement within unevaluated 616305830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // subexpressions of constant expressions, but they can never be ICEs 616405830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // because an ICE cannot contain an lvalue operand. 6165d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 61662de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Extension: 61672de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_LNot: 61682de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 61692de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Minus: 61702de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Not: 61712de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Real: 61722de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Imag: 6173d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(Exp->getSubExpr(), Ctx); 6174d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6175d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6176d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // OffsetOf falls through here. 6177d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6178d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::OffsetOfExprClass: { 6179d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Note that per C99, offsetof must be an ICE. And AFAIK, using 618051f4708c00110940ca3f337961915f2ca1668375Richard Smith // EvaluateAsRValue matches the proposed gcc behavior for cases like 618105830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // "offsetof(struct s{int x[4];}, x[1.0])". This doesn't affect 6182d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // compliance: we should warn earlier for offsetof expressions with 6183d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // array subscripts that aren't ICEs, and if the array subscripts 6184d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // are ICEs, the value of the offsetof must be an integer constant. 6185d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckEvalInICE(E, Ctx); 6186d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6187f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case Expr::UnaryExprOrTypeTraitExprClass: { 6188f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne const UnaryExprOrTypeTraitExpr *Exp = cast<UnaryExprOrTypeTraitExpr>(E); 6189f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if ((Exp->getKind() == UETT_SizeOf) && 6190f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne Exp->getTypeOfArgument()->isVariableArrayType()) 6191d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6192d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6193d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6194d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BinaryOperatorClass: { 6195d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const BinaryOperator *Exp = cast<BinaryOperator>(E); 6196d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (Exp->getOpcode()) { 61972de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_PtrMemD: 61982de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_PtrMemI: 61992de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Assign: 62002de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_MulAssign: 62012de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_DivAssign: 62022de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_RemAssign: 62032de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_AddAssign: 62042de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_SubAssign: 62052de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_ShlAssign: 62062de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_ShrAssign: 62072de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_AndAssign: 62082de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_XorAssign: 62092de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_OrAssign: 621005830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows assignments within unevaluated subexpressions of 621105830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // constant expressions, but they can never be ICEs because an ICE cannot 621205830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // contain an lvalue operand. 6213d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6214d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 62152de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 62162de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 62172de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Rem: 62182de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 62192de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 62202de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shl: 62212de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shr: 62222de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LT: 62232de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GT: 62242de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LE: 62252de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GE: 62262de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_EQ: 62272de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_NE: 62282de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_And: 62292de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Xor: 62302de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Or: 62312de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Comma: { 6232d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 6233d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 62342de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (Exp->getOpcode() == BO_Div || 62352de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall Exp->getOpcode() == BO_Rem) { 623651f4708c00110940ca3f337961915f2ca1668375Richard Smith // EvaluateAsRValue gives an error for undefined Div/Rem, so make sure 6237d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // we don't evaluate one. 62383b332ab132fa85c83833d74d400f6e126f52fbd2John McCall if (LHSResult.Val == 0 && RHSResult.Val == 0) { 6239a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt REval = Exp->getRHS()->EvaluateKnownConstInt(Ctx); 6240d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (REval == 0) 6241d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 6242d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (REval.isSigned() && REval.isAllOnesValue()) { 6243a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt LEval = Exp->getLHS()->EvaluateKnownConstInt(Ctx); 6244d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LEval.isMinSignedValue()) 6245d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 6246d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6247d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6248d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 62492de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (Exp->getOpcode() == BO_Comma) { 6250d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (Ctx.getLangOptions().C99) { 6251d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // C99 6.6p3 introduces a strange edge case: comma can be in an ICE 6252d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // if it isn't evaluated. 6253d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val == 0 && RHSResult.Val == 0) 6254d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 6255d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } else { 6256d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // In both C89 and C++, commas in ICEs are illegal. 6257d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6258d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6259d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6260d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val >= RHSResult.Val) 6261d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return LHSResult; 6262d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6263d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 62642de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LAnd: 62652de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LOr: { 6266d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 6267d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 6268d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val == 0 && RHSResult.Val == 1) { 6269d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Rare case where the RHS has a comma "side-effect"; we need 6270d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // to actually check the condition to see whether the side 6271d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // with the comma is evaluated. 62722de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if ((Exp->getOpcode() == BO_LAnd) != 6273a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith (Exp->getLHS()->EvaluateKnownConstInt(Ctx) == 0)) 6274d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6275d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6276d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6277d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6278d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val >= RHSResult.Val) 6279d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return LHSResult; 6280d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6281d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6282d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6283d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6284d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImplicitCastExprClass: 6285d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CStyleCastExprClass: 6286d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXFunctionalCastExprClass: 6287d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXStaticCastExprClass: 6288d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXReinterpretCastExprClass: 628932cb47174304bc7ec11478b9497c4e10f48273d9Richard Smith case Expr::CXXConstCastExprClass: 6290f85e193739c953358c865005855253af4f68a497John McCall case Expr::ObjCBridgedCastExprClass: { 6291d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); 62922116b144cf07f2574d20517187eb8863645376ebRichard Smith if (isa<ExplicitCastExpr>(E)) { 62932116b144cf07f2574d20517187eb8863645376ebRichard Smith if (const FloatingLiteral *FL 62942116b144cf07f2574d20517187eb8863645376ebRichard Smith = dyn_cast<FloatingLiteral>(SubExpr->IgnoreParenImpCasts())) { 62952116b144cf07f2574d20517187eb8863645376ebRichard Smith unsigned DestWidth = Ctx.getIntWidth(E->getType()); 62962116b144cf07f2574d20517187eb8863645376ebRichard Smith bool DestSigned = E->getType()->isSignedIntegerOrEnumerationType(); 62972116b144cf07f2574d20517187eb8863645376ebRichard Smith APSInt IgnoredVal(DestWidth, !DestSigned); 62982116b144cf07f2574d20517187eb8863645376ebRichard Smith bool Ignored; 62992116b144cf07f2574d20517187eb8863645376ebRichard Smith // If the value does not fit in the destination type, the behavior is 63002116b144cf07f2574d20517187eb8863645376ebRichard Smith // undefined, so we are not required to treat it as a constant 63012116b144cf07f2574d20517187eb8863645376ebRichard Smith // expression. 63022116b144cf07f2574d20517187eb8863645376ebRichard Smith if (FL->getValue().convertToInteger(IgnoredVal, 63032116b144cf07f2574d20517187eb8863645376ebRichard Smith llvm::APFloat::rmTowardZero, 63042116b144cf07f2574d20517187eb8863645376ebRichard Smith &Ignored) & APFloat::opInvalidOp) 63052116b144cf07f2574d20517187eb8863645376ebRichard Smith return ICEDiag(2, E->getLocStart()); 63062116b144cf07f2574d20517187eb8863645376ebRichard Smith return NoDiag(); 63072116b144cf07f2574d20517187eb8863645376ebRichard Smith } 63082116b144cf07f2574d20517187eb8863645376ebRichard Smith } 6309eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman switch (cast<CastExpr>(E)->getCastKind()) { 6310eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_LValueToRValue: 63117a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 63127a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 6313eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_NoOp: 6314eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_IntegralToBoolean: 6315eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_IntegralCast: 6316d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(SubExpr, Ctx); 6317eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman default: 6318eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman return ICEDiag(2, E->getLocStart()); 6319eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman } 6320d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 632156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall case Expr::BinaryConditionalOperatorClass: { 632256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall const BinaryConditionalOperator *Exp = cast<BinaryConditionalOperator>(E); 632356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ICEDiag CommonResult = CheckICE(Exp->getCommon(), Ctx); 632456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (CommonResult.Val == 2) return CommonResult; 632556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 632656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (FalseResult.Val == 2) return FalseResult; 632756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (CommonResult.Val == 1) return CommonResult; 632856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (FalseResult.Val == 1 && 6329a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith Exp->getCommon()->EvaluateKnownConstInt(Ctx) == 0) return NoDiag(); 633056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall return FalseResult; 633156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 6332d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ConditionalOperatorClass: { 6333d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const ConditionalOperator *Exp = cast<ConditionalOperator>(E); 6334d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // If the condition (ignoring parens) is a __builtin_constant_p call, 6335d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // then only the true side is actually considered in an integer constant 6336d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // expression, and it is fully evaluated. This is an important GNU 6337d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // extension. See GCC PR38377 for discussion. 6338d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (const CallExpr *CallCE 6339d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) 634080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (CallCE->isBuiltinCall() == Builtin::BI__builtin_constant_p) 634180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return CheckEvalInICE(E, Ctx); 6342d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); 6343d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (CondResult.Val == 2) 6344d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CondResult; 634563fe6814f339df30b8463b39995947cbdf920e48Douglas Gregor 6346f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); 6347f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 634863fe6814f339df30b8463b39995947cbdf920e48Douglas Gregor 6349d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (TrueResult.Val == 2) 6350d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return TrueResult; 6351d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (FalseResult.Val == 2) 6352d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return FalseResult; 6353d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (CondResult.Val == 1) 6354d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CondResult; 6355d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (TrueResult.Val == 0 && FalseResult.Val == 0) 6356d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6357d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Rare case where the diagnostics depend on which side is evaluated 6358d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Note that if we get here, CondResult is 0, and at least one of 6359d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // TrueResult and FalseResult is non-zero. 6360a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith if (Exp->getCond()->EvaluateKnownConstInt(Ctx) == 0) { 6361d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return FalseResult; 6362d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6363d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return TrueResult; 6364d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6365d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDefaultArgExprClass: 6366d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); 6367d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ChooseExprClass: { 6368d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx); 6369d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6370d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6371d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 63723026348bd4c13a0f83b59839f64065e0fcbea253David Blaikie llvm_unreachable("Invalid StmtClass!"); 6373d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 6374d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6375f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Evaluate an expression as a C++11 integral constant expression. 6376f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateCPlusPlus11IntegralConstantExpr(ASTContext &Ctx, 6377f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const Expr *E, 6378f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith llvm::APSInt *Value, 6379f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith SourceLocation *Loc) { 6380f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!E->getType()->isIntegralOrEnumerationType()) { 6381f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Loc) *Loc = E->getExprLoc(); 6382f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6383f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 6384f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 63854c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith APValue Result; 63864c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!E->isCXX11ConstantExpr(Ctx, &Result, Loc)) 6387dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return false; 6388dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 63894c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith assert(Result.isInt() && "pointer cast to int is not an ICE"); 63904c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Value) *Value = Result.getInt(); 6391dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return true; 6392f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6393f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6394dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smithbool Expr::isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc) const { 6395f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Ctx.getLangOptions().CPlusPlus0x) 6396f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, 0, Loc); 6397f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6398d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag d = CheckICE(this, Ctx); 6399d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (d.Val != 0) { 6400d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (Loc) *Loc = d.Loc; 6401d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return false; 6402d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6403f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 6404f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6405f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6406f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithbool Expr::isIntegerConstantExpr(llvm::APSInt &Value, ASTContext &Ctx, 6407f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith SourceLocation *Loc, bool isEvaluated) const { 6408f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Ctx.getLangOptions().CPlusPlus0x) 6409f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, &Value, Loc); 6410f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6411f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!isIntegerConstantExpr(Ctx, Loc)) 6412f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6413f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateAsInt(Value, Ctx)) 6414d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall llvm_unreachable("ICE cannot be evaluated!"); 6415d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return true; 6416d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 64174c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 64184c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smithbool Expr::isCXX11ConstantExpr(ASTContext &Ctx, APValue *Result, 64194c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith SourceLocation *Loc) const { 64204c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // We support this checking in C++98 mode in order to diagnose compatibility 64214c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // issues. 64224c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith assert(Ctx.getLangOptions().CPlusPlus); 64234c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 64244c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Expr::EvalStatus Status; 64254c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 64264c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Status.Diag = &Diags; 64274c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith EvalInfo Info(Ctx, Status); 64284c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 64294c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith APValue Scratch; 64304c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith bool IsConstExpr = ::EvaluateAsRValue(Info, this, Result ? *Result : Scratch); 64314c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 64324c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!Diags.empty()) { 64334c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith IsConstExpr = false; 64344c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Loc) *Loc = Diags[0].first; 64354c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith } else if (!IsConstExpr) { 64364c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // FIXME: This shouldn't happen. 64374c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Loc) *Loc = getExprLoc(); 64384c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith } 64394c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 64404c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith return IsConstExpr; 64414c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith} 6442745f5147e065900267c85a5568785a1991d4838fRichard Smith 6443745f5147e065900267c85a5568785a1991d4838fRichard Smithbool Expr::isPotentialConstantExpr(const FunctionDecl *FD, 6444745f5147e065900267c85a5568785a1991d4838fRichard Smith llvm::SmallVectorImpl< 6445745f5147e065900267c85a5568785a1991d4838fRichard Smith PartialDiagnosticAt> &Diags) { 6446745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: It would be useful to check constexpr function templates, but at the 6447745f5147e065900267c85a5568785a1991d4838fRichard Smith // moment the constant expression evaluator cannot cope with the non-rigorous 6448745f5147e065900267c85a5568785a1991d4838fRichard Smith // ASTs which we build for dependent expressions. 6449745f5147e065900267c85a5568785a1991d4838fRichard Smith if (FD->isDependentContext()) 6450745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 6451745f5147e065900267c85a5568785a1991d4838fRichard Smith 6452745f5147e065900267c85a5568785a1991d4838fRichard Smith Expr::EvalStatus Status; 6453745f5147e065900267c85a5568785a1991d4838fRichard Smith Status.Diag = &Diags; 6454745f5147e065900267c85a5568785a1991d4838fRichard Smith 6455745f5147e065900267c85a5568785a1991d4838fRichard Smith EvalInfo Info(FD->getASTContext(), Status); 6456745f5147e065900267c85a5568785a1991d4838fRichard Smith Info.CheckingPotentialConstantExpression = true; 6457745f5147e065900267c85a5568785a1991d4838fRichard Smith 6458745f5147e065900267c85a5568785a1991d4838fRichard Smith const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 6459745f5147e065900267c85a5568785a1991d4838fRichard Smith const CXXRecordDecl *RD = MD ? MD->getParent()->getCanonicalDecl() : 0; 6460745f5147e065900267c85a5568785a1991d4838fRichard Smith 6461745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: Fabricate an arbitrary expression on the stack and pretend that it 6462745f5147e065900267c85a5568785a1991d4838fRichard Smith // is a temporary being used as the 'this' pointer. 6463745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue This; 6464745f5147e065900267c85a5568785a1991d4838fRichard Smith ImplicitValueInitExpr VIE(RD ? Info.Ctx.getRecordType(RD) : Info.Ctx.IntTy); 6465745f5147e065900267c85a5568785a1991d4838fRichard Smith This.set(&VIE, Info.CurrentCall); 6466745f5147e065900267c85a5568785a1991d4838fRichard Smith 6467745f5147e065900267c85a5568785a1991d4838fRichard Smith APValue Scratch; 6468745f5147e065900267c85a5568785a1991d4838fRichard Smith ArrayRef<const Expr*> Args; 6469745f5147e065900267c85a5568785a1991d4838fRichard Smith 6470745f5147e065900267c85a5568785a1991d4838fRichard Smith SourceLocation Loc = FD->getLocation(); 6471745f5147e065900267c85a5568785a1991d4838fRichard Smith 6472745f5147e065900267c85a5568785a1991d4838fRichard Smith if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) { 6473745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleConstructorCall(Loc, This, Args, CD, Info, Scratch); 6474745f5147e065900267c85a5568785a1991d4838fRichard Smith } else 6475745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleFunctionCall(Loc, FD, (MD && MD->isInstance()) ? &This : 0, 6476745f5147e065900267c85a5568785a1991d4838fRichard Smith Args, FD->getBody(), Info, Scratch); 6477745f5147e065900267c85a5568785a1991d4838fRichard Smith 6478745f5147e065900267c85a5568785a1991d4838fRichard Smith return Diags.empty(); 6479745f5147e065900267c85a5568785a1991d4838fRichard Smith} 6480