ExprConstant.cpp revision f72fccf533bca206af8e75d041c29db99e6a7f2c
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" 4506a3675627e3b3c47b49c689c8e404a33144194aAnders Carlsson#include "clang/Basic/TargetInfo.h" 467462b39a9bccaf4392687831036713f09f9c0681Mike Stump#include "llvm/ADT/SmallString.h" 474572baba9d18c275968ac113fd73b0e3c77cccb8Mike Stump#include <cstring> 484572baba9d18c275968ac113fd73b0e3c77cccb8Mike Stump 49c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlssonusing namespace clang; 50f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnerusing llvm::APSInt; 51d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanusing llvm::APFloat; 52c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson 5387eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// EvalInfo - This is a private struct used by the evaluator to capture 5487eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// information about a subexpression as it is folded. It retains information 5587eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// about the AST context, but also maintains information about the folded 5687eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// expression. 5787eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// 5887eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// If an expression could be evaluated, it is still possible it is not a C 5987eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// "integer constant expression" or constant expression. If not, this struct 6087eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// captures information about how and why not. 6187eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// 6287eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// One bit of information passed *into* the request for constant folding 6387eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// indicates whether the subexpression is "evaluated" or not according to C 6487eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// rules. For example, the RHS of (0 && foo()) is not evaluated. We can 6587eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// evaluate the expression regardless of what the RHS is, but C only allows 6687eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// certain things in certain situations. 67c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramernamespace { 68180f47959a066795cc0f409433023af448bb0328Richard Smith struct LValue; 69d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith struct CallStackFrame; 70bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith struct EvalInfo; 71d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 721bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType getType(APValue::LValueBase B) { 731bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!B) return QualType(); 741bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) 751bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return D->getType(); 761bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return B.get<const Expr*>()->getType(); 771bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith } 781bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith 79180f47959a066795cc0f409433023af448bb0328Richard Smith /// Get an LValue path entry, which is known to not be an array index, as a 80180f47959a066795cc0f409433023af448bb0328Richard Smith /// field declaration. 81180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *getAsField(APValue::LValuePathEntry E) { 82180f47959a066795cc0f409433023af448bb0328Richard Smith APValue::BaseOrMemberType Value; 83180f47959a066795cc0f409433023af448bb0328Richard Smith Value.setFromOpaqueValue(E.BaseOrMember); 84180f47959a066795cc0f409433023af448bb0328Richard Smith return dyn_cast<FieldDecl>(Value.getPointer()); 85180f47959a066795cc0f409433023af448bb0328Richard Smith } 86180f47959a066795cc0f409433023af448bb0328Richard Smith /// Get an LValue path entry, which is known to not be an array index, as a 87180f47959a066795cc0f409433023af448bb0328Richard Smith /// base class declaration. 88180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *getAsBaseClass(APValue::LValuePathEntry E) { 89180f47959a066795cc0f409433023af448bb0328Richard Smith APValue::BaseOrMemberType Value; 90180f47959a066795cc0f409433023af448bb0328Richard Smith Value.setFromOpaqueValue(E.BaseOrMember); 91180f47959a066795cc0f409433023af448bb0328Richard Smith return dyn_cast<CXXRecordDecl>(Value.getPointer()); 92180f47959a066795cc0f409433023af448bb0328Richard Smith } 93180f47959a066795cc0f409433023af448bb0328Richard Smith /// Determine whether this LValue path entry for a base class names a virtual 94180f47959a066795cc0f409433023af448bb0328Richard Smith /// base class. 95180f47959a066795cc0f409433023af448bb0328Richard Smith bool isVirtualBaseClass(APValue::LValuePathEntry E) { 96180f47959a066795cc0f409433023af448bb0328Richard Smith APValue::BaseOrMemberType Value; 97180f47959a066795cc0f409433023af448bb0328Richard Smith Value.setFromOpaqueValue(E.BaseOrMember); 98180f47959a066795cc0f409433023af448bb0328Richard Smith return Value.getInt(); 99180f47959a066795cc0f409433023af448bb0328Richard Smith } 100180f47959a066795cc0f409433023af448bb0328Richard Smith 101b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Find the path length and type of the most-derived subobject in the given 102b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// path, and find the size of the containing array, if any. 103b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith static 104b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned findMostDerivedSubobject(ASTContext &Ctx, QualType Base, 105b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArrayRef<APValue::LValuePathEntry> Path, 106b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith uint64_t &ArraySize, QualType &Type) { 107b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned MostDerivedLength = 0; 108b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Type = Base; 1099a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith for (unsigned I = 0, N = Path.size(); I != N; ++I) { 110b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Type->isArrayType()) { 111b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const ConstantArrayType *CAT = 112b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith cast<ConstantArrayType>(Ctx.getAsArrayType(Type)); 113b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Type = CAT->getElementType(); 114b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArraySize = CAT->getSize().getZExtValue(); 115b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedLength = I + 1; 116b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } else if (const FieldDecl *FD = getAsField(Path[I])) { 117b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Type = FD->getType(); 118b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArraySize = 0; 119b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedLength = I + 1; 120b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } else { 1219a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith // Path[I] describes a base class. 122b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArraySize = 0; 123b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1249a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 125b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return MostDerivedLength; 1269a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 1279a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 128b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // The order of this enum is important for diagnostics. 129b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith enum CheckSubobjectKind { 130b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CSK_Base, CSK_Derived, CSK_Field, CSK_ArrayToPointer, CSK_ArrayIndex 131b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith }; 132b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1330a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// A path from a glvalue to a subobject of that glvalue. 1340a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith struct SubobjectDesignator { 1350a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// True if the subobject was named in a manner not supported by C++11. Such 1360a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// lvalues can still be folded, but they are not core constant expressions 1370a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// and we cannot perform lvalue-to-rvalue conversions on them. 1380a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith bool Invalid : 1; 1390a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 140b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Is this a pointer one past the end of an object? 141b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool IsOnePastTheEnd : 1; 142b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 143b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// The length of the path to the most-derived object of which this is a 144b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// subobject. 145b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned MostDerivedPathLength : 30; 146b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 147b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// The size of the array of which the most-derived object is an element, or 148b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// 0 if the most-derived object is not an array element. 149b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith uint64_t MostDerivedArraySize; 1500a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 151b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// The type of the most derived object referred to by this address. 152b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith QualType MostDerivedType; 1530a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 1549a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith typedef APValue::LValuePathEntry PathEntry; 1559a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 1560a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// The entries on the path from the glvalue to the designated subobject. 1570a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SmallVector<PathEntry, 8> Entries; 1580a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 159b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator() : Invalid(true) {} 1600a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 161b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith explicit SubobjectDesignator(QualType T) 162b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith : Invalid(false), IsOnePastTheEnd(false), MostDerivedPathLength(0), 163b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedArraySize(0), MostDerivedType(T) {} 164b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 165b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator(ASTContext &Ctx, const APValue &V) 166b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith : Invalid(!V.isLValue() || !V.hasLValuePath()), IsOnePastTheEnd(false), 167b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength(0), MostDerivedArraySize(0) { 1689a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (!Invalid) { 169b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith IsOnePastTheEnd = V.isLValueOnePastTheEnd(); 1709a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith ArrayRef<PathEntry> VEntries = V.getLValuePath(); 1719a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith Entries.insert(Entries.end(), VEntries.begin(), VEntries.end()); 1729a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (V.getLValueBase()) 173b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength = 174b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith findMostDerivedSubobject(Ctx, getType(V.getLValueBase()), 175b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith V.getLValuePath(), MostDerivedArraySize, 176b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedType); 1779a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 1789a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 1799a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 1800a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith void setInvalid() { 1810a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Invalid = true; 1820a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Entries.clear(); 1830a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 184b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 185b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Determine whether this is a one-past-the-end pointer. 186b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool isOnePastTheEnd() const { 187b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (IsOnePastTheEnd) 188b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 189b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedArraySize && 190b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Entries[MostDerivedPathLength - 1].ArrayIndex == MostDerivedArraySize) 191b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 192b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 193b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 194b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 195b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Check that this refers to a valid subobject. 196b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool isValidSubobject() const { 197b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Invalid) 198b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 199b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return !isOnePastTheEnd(); 200b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 201b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Check that this refers to a valid subobject, and if not, produce a 202b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// relevant diagnostic and set the designator as invalid. 203b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkSubobject(EvalInfo &Info, const Expr *E, CheckSubobjectKind CSK); 204b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 205b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Update this designator to refer to the first element within this array. 206b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addArrayUnchecked(const ConstantArrayType *CAT) { 2070a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith PathEntry Entry; 208b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Entry.ArrayIndex = 0; 2090a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Entries.push_back(Entry); 210b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 211b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // This is a most-derived object. 212b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedType = CAT->getElementType(); 213b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedArraySize = CAT->getSize().getZExtValue(); 214b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength = Entries.size(); 2150a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 2160a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// Update this designator to refer to the given base or member of this 2170a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// object. 218b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addDeclUnchecked(const Decl *D, bool Virtual = false) { 2190a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith PathEntry Entry; 220180f47959a066795cc0f409433023af448bb0328Richard Smith APValue::BaseOrMemberType Value(D, Virtual); 221180f47959a066795cc0f409433023af448bb0328Richard Smith Entry.BaseOrMember = Value.getOpaqueValue(); 2220a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Entries.push_back(Entry); 223b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 224b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // If this isn't a base class, it's a new most-derived object. 225b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 226b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedType = FD->getType(); 227b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedArraySize = 0; 228b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength = Entries.size(); 229b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2300a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 231b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void diagnosePointerArithmetic(EvalInfo &Info, const Expr *E, uint64_t N); 2320a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// Add N to the address of this subobject. 233b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void adjustIndex(EvalInfo &Info, const Expr *E, uint64_t N) { 2340a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (Invalid) return; 235b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedPathLength == Entries.size() && MostDerivedArraySize) { 2369a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith Entries.back().ArrayIndex += N; 237b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Entries.back().ArrayIndex > MostDerivedArraySize) { 238b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith diagnosePointerArithmetic(Info, E, Entries.back().ArrayIndex); 239b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 240b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2410a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return; 2420a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 243b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // [expr.add]p4: For the purposes of these operators, a pointer to a 244b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // nonarray object behaves the same as a pointer to the first element of 245b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // an array of length one with the type of the object as its element type. 246b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (IsOnePastTheEnd && N == (uint64_t)-1) 247b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith IsOnePastTheEnd = false; 248b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else if (!IsOnePastTheEnd && N == 1) 249b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith IsOnePastTheEnd = true; 250b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else if (N != 0) { 251b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith diagnosePointerArithmetic(Info, E, uint64_t(IsOnePastTheEnd) + N); 2520a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith setInvalid(); 253b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2540a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 2550a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith }; 2560a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 25747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith /// A core constant value. This can be the value of any constant expression, 25847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith /// or a pointer or reference to a non-static object or function parameter. 259e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// 260e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// For an LValue, the base and offset are stored in the APValue subobject, 261e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// but the other information is stored in the SubobjectDesignator. For all 262e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// other value kinds, the value is stored directly in the APValue subobject. 26347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith class CCValue : public APValue { 26447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith typedef llvm::APSInt APSInt; 26547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith typedef llvm::APFloat APFloat; 266177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith /// If the value is a reference or pointer into a parameter or temporary, 267177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith /// this is the corresponding call stack frame. 268177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith CallStackFrame *CallFrame; 2690a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// If the value is a reference or pointer, this is a description of how the 2700a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// subobject was specified. 2710a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator Designator; 27247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith public: 273177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith struct GlobalValue {}; 274177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith 27547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue() {} 27647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith explicit CCValue(const APSInt &I) : APValue(I) {} 27747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith explicit CCValue(const APFloat &F) : APValue(F) {} 27847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue(const APValue *E, unsigned N) : APValue(E, N) {} 27947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue(const APSInt &R, const APSInt &I) : APValue(R, I) {} 28047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue(const APFloat &R, const APFloat &I) : APValue(R, I) {} 281177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith CCValue(const CCValue &V) : APValue(V), CallFrame(V.CallFrame) {} 2821bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith CCValue(LValueBase B, const CharUnits &O, CallStackFrame *F, 2830a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &D) : 2849a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith APValue(B, O, APValue::NoLValuePath()), CallFrame(F), Designator(D) {} 285b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CCValue(ASTContext &Ctx, const APValue &V, GlobalValue) : 286b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith APValue(V), CallFrame(0), Designator(Ctx, V) {} 287e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith CCValue(const ValueDecl *D, bool IsDerivedMember, 288e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ArrayRef<const CXXRecordDecl*> Path) : 289e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith APValue(D, IsDerivedMember, Path) {} 29065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman CCValue(const AddrLabelExpr* LHSExpr, const AddrLabelExpr* RHSExpr) : 29165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman APValue(LHSExpr, RHSExpr) {} 29247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith 293177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith CallStackFrame *getLValueFrame() const { 29447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith assert(getKind() == LValue); 295177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return CallFrame; 29647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith } 2970a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator &getLValueDesignator() { 2980a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith assert(getKind() == LValue); 2990a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return Designator; 3000a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 3010a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &getLValueDesignator() const { 3020a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return const_cast<CCValue*>(this)->getLValueDesignator(); 3030a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 30447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith }; 30547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith 306bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// A stack frame in the constexpr call stack. 307bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith struct CallStackFrame { 308bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith EvalInfo &Info; 309bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 310bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// Parent - The caller of this stack frame. 311bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame *Caller; 312bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 31308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// CallLoc - The location of the call expression for this call. 31408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SourceLocation CallLoc; 31508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 31608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// Callee - The function which was called. 31708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee; 31808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 319180f47959a066795cc0f409433023af448bb0328Richard Smith /// This - The binding for the this pointer in this call, if any. 320180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue *This; 321180f47959a066795cc0f409433023af448bb0328Richard Smith 322bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// ParmBindings - Parameter bindings for this function call, indexed by 323bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// parameters' function scope indices. 324bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith const CCValue *Arguments; 325bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 326bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith typedef llvm::DenseMap<const Expr*, CCValue> MapTy; 327bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith typedef MapTy::const_iterator temp_iterator; 328bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// Temporaries - Temporary lvalues materialized within this stack frame. 329bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith MapTy Temporaries; 330bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 33108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, 33208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee, const LValue *This, 333180f47959a066795cc0f409433023af448bb0328Richard Smith const CCValue *Arguments); 334bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith ~CallStackFrame(); 335bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith }; 336bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 337dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// A partial diagnostic which we might know in advance that we are not going 338dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// to emit. 339dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith class OptionalDiagnostic { 340dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith PartialDiagnostic *Diag; 341dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 342dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith public: 343dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith explicit OptionalDiagnostic(PartialDiagnostic *Diag = 0) : Diag(Diag) {} 344dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 345dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith template<typename T> 346dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith OptionalDiagnostic &operator<<(const T &v) { 347dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (Diag) 348dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith *Diag << v; 349dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return *this; 350dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 351dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith }; 352dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 353c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer struct EvalInfo { 354dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith ASTContext &Ctx; 3551eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3561e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith /// EvalStatus - Contains information about the evaluation. 3571e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith Expr::EvalStatus &EvalStatus; 358f0c1e4b679e15c26bffb5892e35985bf3c52f77aAnders Carlsson 359d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// CurrentCall - The top of the constexpr call stack. 360bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame *CurrentCall; 361d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 362d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// CallStackDepth - The number of calls in the call stack right now. 363d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith unsigned CallStackDepth; 364d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 36547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith typedef llvm::DenseMap<const OpaqueValueExpr*, CCValue> MapTy; 366bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// OpaqueValues - Values used as the common expression in a 367bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// BinaryConditionalOperator. 368c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer MapTy OpaqueValues; 369bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 370bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// BottomFrame - The frame in which evaluation started. This must be 371745f5147e065900267c85a5568785a1991d4838fRichard Smith /// initialized after CurrentCall and CallStackDepth. 372bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame BottomFrame; 373bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 374180f47959a066795cc0f409433023af448bb0328Richard Smith /// EvaluatingDecl - This is the declaration whose initializer is being 375180f47959a066795cc0f409433023af448bb0328Richard Smith /// evaluated, if any. 376180f47959a066795cc0f409433023af448bb0328Richard Smith const VarDecl *EvaluatingDecl; 377180f47959a066795cc0f409433023af448bb0328Richard Smith 378180f47959a066795cc0f409433023af448bb0328Richard Smith /// EvaluatingDeclValue - This is the value being constructed for the 379180f47959a066795cc0f409433023af448bb0328Richard Smith /// declaration whose initializer is being evaluated, if any. 380180f47959a066795cc0f409433023af448bb0328Richard Smith APValue *EvaluatingDeclValue; 381180f47959a066795cc0f409433023af448bb0328Richard Smith 382c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// HasActiveDiagnostic - Was the previous diagnostic stored? If so, further 383c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// notes attached to it will also be stored, otherwise they will not be. 384c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith bool HasActiveDiagnostic; 385c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 386745f5147e065900267c85a5568785a1991d4838fRichard Smith /// CheckingPotentialConstantExpression - Are we checking whether the 387745f5147e065900267c85a5568785a1991d4838fRichard Smith /// expression is a potential constant expression? If so, some diagnostics 388745f5147e065900267c85a5568785a1991d4838fRichard Smith /// are suppressed. 389745f5147e065900267c85a5568785a1991d4838fRichard Smith bool CheckingPotentialConstantExpression; 390745f5147e065900267c85a5568785a1991d4838fRichard Smith 391bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 392bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith EvalInfo(const ASTContext &C, Expr::EvalStatus &S) 393dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith : Ctx(const_cast<ASTContext&>(C)), EvalStatus(S), CurrentCall(0), 39408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackDepth(0), BottomFrame(*this, SourceLocation(), 0, 0, 0), 395745f5147e065900267c85a5568785a1991d4838fRichard Smith EvaluatingDecl(0), EvaluatingDeclValue(0), HasActiveDiagnostic(false), 396745f5147e065900267c85a5568785a1991d4838fRichard Smith CheckingPotentialConstantExpression(false) {} 397bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 39847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith const CCValue *getOpaqueValue(const OpaqueValueExpr *e) const { 399c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer MapTy::const_iterator i = OpaqueValues.find(e); 400c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer if (i == OpaqueValues.end()) return 0; 401c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer return &i->second; 402c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer } 40356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 404180f47959a066795cc0f409433023af448bb0328Richard Smith void setEvaluatingDecl(const VarDecl *VD, APValue &Value) { 405180f47959a066795cc0f409433023af448bb0328Richard Smith EvaluatingDecl = VD; 406180f47959a066795cc0f409433023af448bb0328Richard Smith EvaluatingDeclValue = &Value; 407180f47959a066795cc0f409433023af448bb0328Richard Smith } 408180f47959a066795cc0f409433023af448bb0328Richard Smith 409c18c42345636e2866fed75c7e434fb659d747672Richard Smith const LangOptions &getLangOpts() const { return Ctx.getLangOptions(); } 410c18c42345636e2866fed75c7e434fb659d747672Richard Smith 411c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith bool CheckCallLimit(SourceLocation Loc) { 412745f5147e065900267c85a5568785a1991d4838fRichard Smith // Don't perform any constexpr calls (other than the call we're checking) 413745f5147e065900267c85a5568785a1991d4838fRichard Smith // when checking a potential constant expression. 414745f5147e065900267c85a5568785a1991d4838fRichard Smith if (CheckingPotentialConstantExpression && CallStackDepth > 1) 415745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 416c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (CallStackDepth <= getLangOpts().ConstexprCallDepth) 417c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 418c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Diag(Loc, diag::note_constexpr_depth_limit_exceeded) 419c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << getLangOpts().ConstexprCallDepth; 420c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 421c18c42345636e2866fed75c7e434fb659d747672Richard Smith } 422f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 423c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith private: 424c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Add a diagnostic to the diagnostics list. 425c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith PartialDiagnostic &addDiag(SourceLocation Loc, diag::kind DiagId) { 426c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith PartialDiagnostic PD(DiagId, Ctx.getDiagAllocator()); 427c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith EvalStatus.Diag->push_back(std::make_pair(Loc, PD)); 428c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return EvalStatus.Diag->back().second; 429c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 430c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 43108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// Add notes containing a call stack to the current point of evaluation. 43208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith void addCallStack(unsigned Limit); 43308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 434c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith public: 435f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// Diagnose that the evaluation cannot be folded. 4367098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith OptionalDiagnostic Diag(SourceLocation Loc, diag::kind DiagId 4377098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith = diag::note_invalid_subexpr_in_const_expr, 438c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned ExtraNotes = 0) { 439f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // If we have a prior diagnostic, it will be noting that the expression 440f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // isn't a constant expression. This diagnostic is more important. 441f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: We might want to show both diagnostics to the user. 442dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (EvalStatus.Diag) { 44308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned CallStackNotes = CallStackDepth - 1; 44408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned Limit = Ctx.getDiagnostics().getConstexprBacktraceLimit(); 44508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (Limit) 44608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackNotes = std::min(CallStackNotes, Limit + 1); 447745f5147e065900267c85a5568785a1991d4838fRichard Smith if (CheckingPotentialConstantExpression) 448745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackNotes = 0; 44908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 450c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HasActiveDiagnostic = true; 451dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith EvalStatus.Diag->clear(); 45208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith EvalStatus.Diag->reserve(1 + ExtraNotes + CallStackNotes); 45308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Loc, DiagId); 454745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!CheckingPotentialConstantExpression) 455745f5147e065900267c85a5568785a1991d4838fRichard Smith addCallStack(Limit); 45608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith return OptionalDiagnostic(&(*EvalStatus.Diag)[0].second); 457dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 458c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HasActiveDiagnostic = false; 459dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return OptionalDiagnostic(); 460dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 461dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 462dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// Diagnose that the evaluation does not produce a C++11 core constant 463dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// expression. 4647098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith OptionalDiagnostic CCEDiag(SourceLocation Loc, diag::kind DiagId 4657098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith = diag::note_invalid_subexpr_in_const_expr, 466c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned ExtraNotes = 0) { 467dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith // Don't override a previous diagnostic. 468dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (!EvalStatus.Diag || !EvalStatus.Diag->empty()) 469dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return OptionalDiagnostic(); 470c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return Diag(Loc, DiagId, ExtraNotes); 471c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 472c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 473c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Add a note to a prior diagnostic. 474c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith OptionalDiagnostic Note(SourceLocation Loc, diag::kind DiagId) { 475c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!HasActiveDiagnostic) 476c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return OptionalDiagnostic(); 477c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return OptionalDiagnostic(&addDiag(Loc, DiagId)); 478f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 479099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 480099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith /// Add a stack of notes to a prior diagnostic. 481099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith void addNotes(ArrayRef<PartialDiagnosticAt> Diags) { 482099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (HasActiveDiagnostic) { 483099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EvalStatus.Diag->insert(EvalStatus.Diag->end(), 484099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Diags.begin(), Diags.end()); 485099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 486099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 487745f5147e065900267c85a5568785a1991d4838fRichard Smith 488745f5147e065900267c85a5568785a1991d4838fRichard Smith /// Should we continue evaluation as much as possible after encountering a 489745f5147e065900267c85a5568785a1991d4838fRichard Smith /// construct which can't be folded? 490745f5147e065900267c85a5568785a1991d4838fRichard Smith bool keepEvaluatingAfterFailure() { 491745f5147e065900267c85a5568785a1991d4838fRichard Smith return CheckingPotentialConstantExpression && EvalStatus.Diag->empty(); 492745f5147e065900267c85a5568785a1991d4838fRichard Smith } 493c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer }; 49408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 49508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 496b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithbool SubobjectDesignator::checkSubobject(EvalInfo &Info, const Expr *E, 497b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CheckSubobjectKind CSK) { 498b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Invalid) 499b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 500b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (isOnePastTheEnd()) { 501b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_past_end_subobject) 502b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << CSK; 503b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 504b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 505b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 506b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 507b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith} 508b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 509b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithvoid SubobjectDesignator::diagnosePointerArithmetic(EvalInfo &Info, 510b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const Expr *E, uint64_t N) { 511b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedPathLength == Entries.size() && MostDerivedArraySize) 512b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_array_index) 513b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<int>(N) << /*array*/ 0 514b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<unsigned>(MostDerivedArraySize); 515b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 516b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_array_index) 517b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<int>(N) << /*non-array*/ 1; 518b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 519b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith} 520b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 52108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard SmithCallStackFrame::CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, 52208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee, const LValue *This, 52308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const CCValue *Arguments) 52408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith : Info(Info), Caller(Info.CurrentCall), CallLoc(CallLoc), Callee(Callee), 52508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith This(This), Arguments(Arguments) { 52608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Info.CurrentCall = this; 52708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith ++Info.CallStackDepth; 52808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 52908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 53008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard SmithCallStackFrame::~CallStackFrame() { 53108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith assert(Info.CurrentCall == this && "calls retired out of order"); 53208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith --Info.CallStackDepth; 53308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Info.CurrentCall = Caller; 53408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 53587eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner 53608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith/// Produce a string describing the given constexpr call. 53708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithstatic void describeCall(CallStackFrame *Frame, llvm::raw_ostream &Out) { 53808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned ArgIndex = 0; 53908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith bool IsMemberCall = isa<CXXMethodDecl>(Frame->Callee) && 54008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith !isa<CXXConstructorDecl>(Frame->Callee); 54108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 54208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (!IsMemberCall) 54308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << *Frame->Callee << '('; 54408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 54508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith for (FunctionDecl::param_const_iterator I = Frame->Callee->param_begin(), 54608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith E = Frame->Callee->param_end(); I != E; ++I, ++ArgIndex) { 5475fe31228c883040cf016cfc71ad4bfeba462602eNAKAMURA Takumi if (ArgIndex > (unsigned)IsMemberCall) 54808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << ", "; 54908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 55008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const ParmVarDecl *Param = *I; 55108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const CCValue &Arg = Frame->Arguments[ArgIndex]; 55208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (!Arg.isLValue() || Arg.getLValueDesignator().Invalid) 55308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Arg.printPretty(Out, Frame->Info.Ctx, Param->getType()); 55408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith else { 55508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Deliberately slice off the frame to form an APValue we can print. 55608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith APValue Value(Arg.getLValueBase(), Arg.getLValueOffset(), 55708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Arg.getLValueDesignator().Entries, 558b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Arg.getLValueDesignator().IsOnePastTheEnd); 55908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Value.printPretty(Out, Frame->Info.Ctx, Param->getType()); 56008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 56108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 56208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (ArgIndex == 0 && IsMemberCall) 56308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << "->" << *Frame->Callee << '('; 564bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith } 565d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 56608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << ')'; 56708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 56808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 56908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithvoid EvalInfo::addCallStack(unsigned Limit) { 57008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Determine which calls to skip, if any. 57108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned ActiveCalls = CallStackDepth - 1; 57208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned SkipStart = ActiveCalls, SkipEnd = SkipStart; 57308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (Limit && Limit < ActiveCalls) { 57408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SkipStart = Limit / 2 + Limit % 2; 57508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SkipEnd = ActiveCalls - Limit / 2; 57608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 57708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 57808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Walk the call stack and add the diagnostics. 57908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned CallIdx = 0; 58008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith for (CallStackFrame *Frame = CurrentCall; Frame != &BottomFrame; 58108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Frame = Frame->Caller, ++CallIdx) { 58208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Skip this call? 58308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (CallIdx >= SkipStart && CallIdx < SkipEnd) { 58408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (CallIdx == SkipStart) { 58508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Note that we're skipping calls. 58608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Frame->CallLoc, diag::note_constexpr_calls_suppressed) 58708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith << unsigned(ActiveCalls - Limit); 58808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 58908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith continue; 59008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 59108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 59208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith llvm::SmallVector<char, 128> Buffer; 59308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith llvm::raw_svector_ostream Out(Buffer); 59408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith describeCall(Frame, Out); 59508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Frame->CallLoc, diag::note_constexpr_call_here) << Out.str(); 596bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith } 59708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 598d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 59908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithnamespace { 600f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall struct ComplexValue { 601f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall private: 602f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool IsInt; 603f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 604f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall public: 605f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt IntReal, IntImag; 606f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat FloatReal, FloatImag; 607f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 608f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue() : FloatReal(APFloat::Bogus), FloatImag(APFloat::Bogus) {} 609f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 610f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall void makeComplexFloat() { IsInt = false; } 611f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool isComplexFloat() const { return !IsInt; } 612f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat &getComplexFloatReal() { return FloatReal; } 613f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat &getComplexFloatImag() { return FloatImag; } 614f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 615f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall void makeComplexInt() { IsInt = true; } 616f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool isComplexInt() const { return IsInt; } 617f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt &getComplexIntReal() { return IntReal; } 618f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt &getComplexIntImag() { return IntImag; } 619f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 62047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith void moveInto(CCValue &v) const { 621f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall if (isComplexFloat()) 62247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith v = CCValue(FloatReal, FloatImag); 623f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall else 62447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith v = CCValue(IntReal, IntImag); 625f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall } 62647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith void setFrom(const CCValue &v) { 62756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall assert(v.isComplexFloat() || v.isComplexInt()); 62856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (v.isComplexFloat()) { 62956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall makeComplexFloat(); 63056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall FloatReal = v.getComplexFloatReal(); 63156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall FloatImag = v.getComplexFloatImag(); 63256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } else { 63356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall makeComplexInt(); 63456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall IntReal = v.getComplexIntReal(); 63556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall IntImag = v.getComplexIntImag(); 63656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 63756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 638f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall }; 639efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 640efdb83e26f9a1fd2566afe54461216cd84814d42John McCall struct LValue { 6411bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith APValue::LValueBase Base; 642efdb83e26f9a1fd2566afe54461216cd84814d42John McCall CharUnits Offset; 643177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith CallStackFrame *Frame; 6440a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator Designator; 645efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 6461bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const APValue::LValueBase getLValueBase() const { return Base; } 64747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CharUnits &getLValueOffset() { return Offset; } 648625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const CharUnits &getLValueOffset() const { return Offset; } 649177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith CallStackFrame *getLValueFrame() const { return Frame; } 6500a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator &getLValueDesignator() { return Designator; } 6510a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &getLValueDesignator() const { return Designator;} 652efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 65347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith void moveInto(CCValue &V) const { 6540a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith V = CCValue(Base, Offset, Frame, Designator); 655efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } 65647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith void setFrom(const CCValue &V) { 65747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith assert(V.isLValue()); 65847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Base = V.getLValueBase(); 65947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Offset = V.getLValueOffset(); 660177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith Frame = V.getLValueFrame(); 6610a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Designator = V.getLValueDesignator(); 6620a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 6630a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 6641bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith void set(APValue::LValueBase B, CallStackFrame *F = 0) { 6651bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Base = B; 6660a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Offset = CharUnits::Zero(); 6670a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Frame = F; 668b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator = SubobjectDesignator(getType(B)); 669b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 670b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 671b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check that this LValue is not based on a null pointer. If it is, produce 672b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // a diagnostic and mark the designator as invalid. 673b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkNullPointer(EvalInfo &Info, const Expr *E, 674b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CheckSubobjectKind CSK) { 675b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.Invalid) 676b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 677b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Base) { 678b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_null_subobject) 679b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << CSK; 680b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.setInvalid(); 681b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 682b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 683b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 684b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 685b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 686b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check this LValue refers to an object. If not, set the designator to be 687b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // invalid and emit a diagnostic. 688b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkSubobject(EvalInfo &Info, const Expr *E, CheckSubobjectKind CSK) { 689b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return checkNullPointer(Info, E, CSK) && 690b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.checkSubobject(Info, E, CSK); 691b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 692b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 693b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addDecl(EvalInfo &Info, const Expr *E, 694b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const Decl *D, bool Virtual = false) { 695b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith checkSubobject(Info, E, isa<FieldDecl>(D) ? CSK_Field : CSK_Base); 696b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addDeclUnchecked(D, Virtual); 697b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 698b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addArray(EvalInfo &Info, const Expr *E, const ConstantArrayType *CAT) { 699b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith checkSubobject(Info, E, CSK_ArrayToPointer); 700b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addArrayUnchecked(CAT); 701b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 702b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void adjustIndex(EvalInfo &Info, const Expr *E, uint64_t N) { 703b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!checkNullPointer(Info, E, CSK_ArrayIndex)) 704b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return; 705b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.adjustIndex(Info, E, N); 70656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 707efdb83e26f9a1fd2566afe54461216cd84814d42John McCall }; 708e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 709e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith struct MemberPtr { 710e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr() {} 711e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith explicit MemberPtr(const ValueDecl *Decl) : 712e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember(Decl, false), Path() {} 713e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 714e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// The member or (direct or indirect) field referred to by this member 715e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// pointer, or 0 if this is a null member pointer. 716e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ValueDecl *getDecl() const { 717e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DeclAndIsDerivedMember.getPointer(); 718e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 719e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Is this actually a member of some type derived from the relevant class? 720e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool isDerivedMember() const { 721e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DeclAndIsDerivedMember.getInt(); 722e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 723e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Get the class which the declaration actually lives in. 724e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *getContainingRecord() const { 725e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return cast<CXXRecordDecl>( 726e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.getPointer()->getDeclContext()); 727e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 728e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 729e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith void moveInto(CCValue &V) const { 730e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith V = CCValue(getDecl(), isDerivedMember(), Path); 731e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 732e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith void setFrom(const CCValue &V) { 733e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(V.isMemberPointer()); 734e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setPointer(V.getMemberPointerDecl()); 735e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(V.isMemberPointerToDerivedMember()); 736e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.clear(); 737e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ArrayRef<const CXXRecordDecl*> P = V.getMemberPointerPath(); 738e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.insert(Path.end(), P.begin(), P.end()); 739e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 740e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 741e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// DeclAndIsDerivedMember - The member declaration, and a flag indicating 742e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// whether the member is a member of some class derived from the class type 743e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// of the member pointer. 744e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith llvm::PointerIntPair<const ValueDecl*, 1, bool> DeclAndIsDerivedMember; 745e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Path - The path of base/derived classes from the member declaration's 746e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// class (exclusive) to the class type of the member pointer (inclusive). 747e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith SmallVector<const CXXRecordDecl*, 4> Path; 748e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 749e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a cast towards the class of the Decl (either up or down the 750e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// hierarchy). 751e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castBack(const CXXRecordDecl *Class) { 752e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!Path.empty()); 753e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Expected; 754e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.size() >= 2) 755e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Expected = Path[Path.size() - 2]; 756e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith else 757e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Expected = getContainingRecord(); 758e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Expected->getCanonicalDecl() != Class->getCanonicalDecl()) { 759e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.static.cast]p12: In a conversion from (D::*) to (B::*), 760e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // if B does not contain the original member and is not a base or 761e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // derived class of the class containing the original member, the result 762e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // of the cast is undefined. 763e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [conv.mem]p2 does not cover this case for a cast from (B::*) to 764e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // (D::*). We consider that to be a language defect. 765e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 766e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 767e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.pop_back(); 768e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 769e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 770e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a base-to-derived member pointer cast. 771e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castToDerived(const CXXRecordDecl *Derived) { 772e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!getDecl()) 773e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 774e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!isDerivedMember()) { 775e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.push_back(Derived); 776e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 777e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 778e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!castBack(Derived)) 779e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 780e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.empty()) 781e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(false); 782e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 783e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 784e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a derived-to-base member pointer cast. 785e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castToBase(const CXXRecordDecl *Base) { 786e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!getDecl()) 787e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 788e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.empty()) 789e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(true); 790e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isDerivedMember()) { 791e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.push_back(Base); 792e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 793e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 794e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return castBack(Base); 795e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 796e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith }; 797c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 798c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Kinds of constant expression checking, for diagnostics. 799c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith enum CheckConstantExpressionKind { 800c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_Constant, ///< A normal constant. 801c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_ReturnValue, ///< A constexpr function return value. 802c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_MemberInit ///< A constexpr constructor mem-initializer. 803c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith }; 804f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall} 80587eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner 80647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smithstatic bool Evaluate(CCValue &Result, EvalInfo &Info, const Expr *E); 80769c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smithstatic bool EvaluateConstantExpression(APValue &Result, EvalInfo &Info, 808c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const LValue &This, const Expr *E, 809c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CheckConstantExpressionKind CCEK 810c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith = CCEK_Constant); 811efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluateLValue(const Expr *E, LValue &Result, EvalInfo &Info); 812efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluatePointer(const Expr *E, LValue &Result, EvalInfo &Info); 813e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, 814e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith EvalInfo &Info); 815e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info); 81687eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattnerstatic bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info); 81747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smithstatic bool EvaluateIntegerOrLValue(const Expr *E, CCValue &Result, 818d9becd1846e2c72bf6ad283faa1b048f33dd3afeChris Lattner EvalInfo &Info); 819d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanstatic bool EvaluateFloat(const Expr *E, APFloat &Result, EvalInfo &Info); 820f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCallstatic bool EvaluateComplex(const Expr *E, ComplexValue &Res, EvalInfo &Info); 821f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 822f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 8234efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman// Misc utilities 8244efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 8254efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 826180f47959a066795cc0f409433023af448bb0328Richard Smith/// Should this call expression be treated as a string literal? 827180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool IsStringLiteralCall(const CallExpr *E) { 828180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned Builtin = E->isBuiltinCall(); 829180f47959a066795cc0f409433023af448bb0328Richard Smith return (Builtin == Builtin::BI__builtin___CFStringMakeConstantString || 830180f47959a066795cc0f409433023af448bb0328Richard Smith Builtin == Builtin::BI__builtin___NSStringMakeConstantString); 831180f47959a066795cc0f409433023af448bb0328Richard Smith} 832180f47959a066795cc0f409433023af448bb0328Richard Smith 8331bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smithstatic bool IsGlobalLValue(APValue::LValueBase B) { 834180f47959a066795cc0f409433023af448bb0328Richard Smith // C++11 [expr.const]p3 An address constant expression is a prvalue core 835180f47959a066795cc0f409433023af448bb0328Richard Smith // constant expression of pointer type that evaluates to... 836180f47959a066795cc0f409433023af448bb0328Richard Smith 837180f47959a066795cc0f409433023af448bb0328Richard Smith // ... a null pointer value, or a prvalue core constant expression of type 838180f47959a066795cc0f409433023af448bb0328Richard Smith // std::nullptr_t. 8391bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!B) return true; 84042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 8411bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { 842180f47959a066795cc0f409433023af448bb0328Richard Smith // ... the address of an object with static storage duration, 8431bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 84442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return VD->hasGlobalStorage(); 8451bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith // ... the address of a function, 8461bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return isa<FunctionDecl>(D); 84742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall } 8481bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith 8491bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const Expr *E = B.get<const Expr*>(); 8501bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith switch (E->getStmtClass()) { 8511bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith default: 8521bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return false; 853180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::CompoundLiteralExprClass: 854180f47959a066795cc0f409433023af448bb0328Richard Smith return cast<CompoundLiteralExpr>(E)->isFileScope(); 855180f47959a066795cc0f409433023af448bb0328Richard Smith // A string literal has static storage duration. 856180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::StringLiteralClass: 857180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::PredefinedExprClass: 858180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::ObjCStringLiteralClass: 859180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::ObjCEncodeExprClass: 86047d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith case Expr::CXXTypeidExprClass: 861180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 862180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::CallExprClass: 863180f47959a066795cc0f409433023af448bb0328Richard Smith return IsStringLiteralCall(cast<CallExpr>(E)); 864180f47959a066795cc0f409433023af448bb0328Richard Smith // For GCC compatibility, &&label has static storage duration. 865180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::AddrLabelExprClass: 866180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 867180f47959a066795cc0f409433023af448bb0328Richard Smith // A Block literal expression may be used as the initialization value for 868180f47959a066795cc0f409433023af448bb0328Richard Smith // Block variables at global or local static scope. 869180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::BlockExprClass: 870180f47959a066795cc0f409433023af448bb0328Richard Smith return !cast<BlockExpr>(E)->getBlockDecl()->hasCaptures(); 871745f5147e065900267c85a5568785a1991d4838fRichard Smith case Expr::ImplicitValueInitExprClass: 872745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: 873745f5147e065900267c85a5568785a1991d4838fRichard Smith // We can never form an lvalue with an implicit value initialization as its 874745f5147e065900267c85a5568785a1991d4838fRichard Smith // base through expression evaluation, so these only appear in one case: the 875745f5147e065900267c85a5568785a1991d4838fRichard Smith // implicit variable declaration we invent when checking whether a constexpr 876745f5147e065900267c85a5568785a1991d4838fRichard Smith // constructor can produce a constant expression. We must assume that such 877745f5147e065900267c85a5568785a1991d4838fRichard Smith // an expression might be a global lvalue. 878745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 879180f47959a066795cc0f409433023af448bb0328Richard Smith } 88042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 88142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 8829a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// Check that this reference or pointer core constant expression is a valid 883b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// value for an address or reference constant expression. Type T should be 88461e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith/// either LValue or CCValue. Return true if we can fold this expression, 88561e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith/// whether or not it's a constant expression. 8869a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smithtemplate<typename T> 887f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool CheckLValueConstantExpression(EvalInfo &Info, const Expr *E, 888c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const T &LVal, APValue &Value, 889c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CheckConstantExpressionKind CCEK) { 890c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APValue::LValueBase Base = LVal.getLValueBase(); 891c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const SubobjectDesignator &Designator = LVal.getLValueDesignator(); 892c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 893c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!IsGlobalLValue(Base)) { 894c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 895c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 896c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_non_global, 1) 897c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << E->isGLValue() << !Designator.Entries.empty() 898c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << !!VD << CCEK << VD; 899c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (VD) 900c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 901c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith else 902c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Note(Base.dyn_cast<const Expr*>()->getExprLoc(), 903c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith diag::note_constexpr_temporary_here); 904c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else { 9057098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc()); 906c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 90761e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith // Don't allow references to temporaries to escape. 90869c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return false; 909f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 91069c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 911b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool IsReferenceType = E->isGLValue(); 912b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 913b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.Invalid) { 91461e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith // This is not a core constant expression. An appropriate diagnostic will 91561e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith // have already been produced. 9169a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith Value = APValue(LVal.getLValueBase(), LVal.getLValueOffset(), 9179a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith APValue::NoLValuePath()); 9189a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith return true; 9199a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 9209a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 921b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Value = APValue(LVal.getLValueBase(), LVal.getLValueOffset(), 922b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.Entries, Designator.IsOnePastTheEnd); 923b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 924b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Allow address constant expressions to be past-the-end pointers. This is 925b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // an extension: the standard requires them to point to an object. 926b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!IsReferenceType) 927b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 928b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 929b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A reference constant expression must refer to an object. 930b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Base) { 931b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // FIXME: diagnostic 932b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc()); 93361e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith return true; 934b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 935b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 936c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith // Does this refer one past the end of some object? 937b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.isOnePastTheEnd()) { 938c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 939c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_past_end, 1) 940c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << !Designator.Entries.empty() << !!VD << VD; 941c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (VD) 942c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 943c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith else 944c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Note(Base.dyn_cast<const Expr*>()->getExprLoc(), 945c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith diag::note_constexpr_temporary_here); 946c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 947c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 94869c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return true; 94947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith} 95047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith 95151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// Check that this core constant expression is of literal type, and if not, 95251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// produce an appropriate diagnostic. 95351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smithstatic bool CheckLiteralType(EvalInfo &Info, const Expr *E) { 95451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!E->isRValue() || E->getType()->isLiteralType()) 95551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 95651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 95751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Prvalue constant expressions must be of literal types. 95851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (Info.getLangOpts().CPlusPlus0x) 95951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_nonliteral) 96051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith << E->getType(); 96151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith else 96251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 96351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 96451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 96551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 9669a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// Check that this core constant expression value is a valid value for a 9679a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// constant expression, and if it is, produce the corresponding constant value. 96851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// If not, report an appropriate diagnostic. Does not check that the expression 96951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// is of literal type. 970f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool CheckConstantExpression(EvalInfo &Info, const Expr *E, 971c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const CCValue &CCValue, APValue &Value, 972c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CheckConstantExpressionKind CCEK 973c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith = CCEK_Constant) { 9749a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (!CCValue.isLValue()) { 9759a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith Value = CCValue; 9769a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith return true; 9779a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 978c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return CheckLValueConstantExpression(Info, E, CCValue, Value, CCEK); 9799a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith} 9809a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 9819e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smithconst ValueDecl *GetLValueBaseDecl(const LValue &LVal) { 9821bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return LVal.Base.dyn_cast<const ValueDecl*>(); 9839e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith} 9849e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith 9859e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smithstatic bool IsLiteralLValue(const LValue &Value) { 9861bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Value.Base.dyn_cast<const Expr*>() && !Value.Frame; 9879e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith} 9889e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith 98965ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smithstatic bool IsWeakLValue(const LValue &Value) { 99065ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith const ValueDecl *Decl = GetLValueBaseDecl(Value); 9910dd7a25e8d679de1dc0ce788222d6dee0e879885Lang Hames return Decl && Decl->isWeak(); 99265ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith} 99365ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith 994e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvalPointerValueAsBool(const CCValue &Value, bool &Result) { 9953554283157190e67918fad4221a5e6faf9317362John McCall // A null base expression indicates a null pointer. These are always 9963554283157190e67918fad4221a5e6faf9317362John McCall // evaluatable, and they are false unless the offset is zero. 997e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Value.getLValueBase()) { 998e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = !Value.getLValueOffset().isZero(); 9993554283157190e67918fad4221a5e6faf9317362John McCall return true; 10003554283157190e67918fad4221a5e6faf9317362John McCall } 10013554283157190e67918fad4221a5e6faf9317362John McCall 1002e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // We have a non-null base. These are generally known to be true, but if it's 1003e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // a weak declaration it can be null at runtime. 10043554283157190e67918fad4221a5e6faf9317362John McCall Result = true; 1005e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ValueDecl *Decl = Value.getLValueBase().dyn_cast<const ValueDecl*>(); 10060dd7a25e8d679de1dc0ce788222d6dee0e879885Lang Hames return !Decl || !Decl->isWeak(); 10075bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman} 10085bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman 100947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smithstatic bool HandleConversionToBool(const CCValue &Val, bool &Result) { 1010c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith switch (Val.getKind()) { 1011c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Uninitialized: 1012c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1013c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Int: 1014c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = Val.getInt().getBoolValue(); 101541bf4f38348561a0f12c10d34f1673cd19a6eb04Richard Smith return true; 1016c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Float: 1017c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = !Val.getFloat().isZero(); 1018a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman return true; 1019c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::ComplexInt: 1020c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = Val.getComplexIntReal().getBoolValue() || 1021c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Val.getComplexIntImag().getBoolValue(); 1022c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return true; 1023c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::ComplexFloat: 1024c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = !Val.getComplexFloatReal().isZero() || 1025c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith !Val.getComplexFloatImag().isZero(); 1026436c8898cd1c93c5bacd3fcc4ac586bc5cd77062Richard Smith return true; 1027e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case APValue::LValue: 1028e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvalPointerValueAsBool(Val, Result); 1029e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case APValue::MemberPointer: 1030e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = Val.getMemberPointerDecl(); 1031e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 1032c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Vector: 1033cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith case APValue::Array: 1034180f47959a066795cc0f409433023af448bb0328Richard Smith case APValue::Struct: 1035180f47959a066795cc0f409433023af448bb0328Richard Smith case APValue::Union: 103665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman case APValue::AddrLabelDiff: 1037c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 10384efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 10394efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 1040c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith llvm_unreachable("unknown APValue kind"); 1041c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 1042c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1043c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithstatic bool EvaluateAsBooleanCondition(const Expr *E, bool &Result, 1044c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalInfo &Info) { 1045c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && "missing lvalue-to-rvalue conv in bool condition"); 104647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue Val; 1047c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!Evaluate(Val, Info, E)) 1048c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1049c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return HandleConversionToBool(Val, Result); 10504efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 10514efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 1052c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithtemplate<typename T> 1053c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleOverflow(EvalInfo &Info, const Expr *E, 1054c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const T &SrcValue, QualType DestType) { 1055c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith llvm::SmallVector<char, 32> Buffer; 1056c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith SrcValue.toString(Buffer); 1057c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_overflow) 1058c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << StringRef(Buffer.data(), Buffer.size()) << DestType; 1059c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 1060c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith} 1061c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 1062c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleFloatToIntCast(EvalInfo &Info, const Expr *E, 1063c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, const APFloat &Value, 1064c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType DestType, APSInt &Result) { 1065c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned DestWidth = Info.Ctx.getIntWidth(DestType); 1066a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // Determine whether we are converting to unsigned or signed. 1067575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor bool DestSigned = DestType->isSignedIntegerOrEnumerationType(); 10681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1069c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result = APSInt(DestWidth, !DestSigned); 1070a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar bool ignored; 1071c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Value.convertToInteger(Result, llvm::APFloat::rmTowardZero, &ignored) 1072c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opInvalidOp) 1073c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1074c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1075a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1076a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1077c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleFloatToFloatCast(EvalInfo &Info, const Expr *E, 1078c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, QualType DestType, 1079c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat &Result) { 1080c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat Value = Result; 1081a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar bool ignored; 1082c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Result.convert(Info.Ctx.getFloatTypeSemantics(DestType), 1083c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat::rmNearestTiesToEven, &ignored) 1084c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opOverflow) 1085c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1086c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1087a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1088a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1089f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smithstatic APSInt HandleIntToIntCast(EvalInfo &Info, const Expr *E, 1090f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith QualType DestType, QualType SrcType, 1091f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith APSInt &Value) { 1092f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith unsigned DestWidth = Info.Ctx.getIntWidth(DestType); 1093a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar APSInt Result = Value; 1094a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // Figure out if this is a truncate, extend or noop cast. 1095a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // If the input is signed, do a sign extend, noop, or truncate. 10969f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Result = Result.extOrTrunc(DestWidth); 1097f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith 1098f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // Check whether we overflowed. If so, fold the cast anyway. 1099f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith if (DestType->isSignedIntegerOrEnumerationType() && 1100f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith ((Result.isNegative() && Value.isUnsigned()) || 1101f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.extOrTrunc(Value.getBitWidth()) != Value)) 1102f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith (void)HandleOverflow(Info, E, Value, DestType); 1103f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith 1104575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor Result.setIsUnsigned(DestType->isUnsignedIntegerOrEnumerationType()); 1105a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar return Result; 1106a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1107a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1108c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleIntToFloatCast(EvalInfo &Info, const Expr *E, 1109c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, const APSInt &Value, 1110c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType DestType, APFloat &Result) { 1111c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result = APFloat(Info.Ctx.getFloatTypeSemantics(DestType), 1); 1112c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Result.convertFromAPInt(Value, Value.isSigned(), 1113c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat::rmNearestTiesToEven) 1114c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opOverflow) 1115c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1116c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1117a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1118a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1119e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedmanstatic bool EvalAndBitcastToAPInt(EvalInfo &Info, const Expr *E, 1120e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt &Res) { 1121e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman CCValue SVal; 1122e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (!Evaluate(SVal, Info, E)) 1123e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1124e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isInt()) { 1125e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = SVal.getInt(); 1126e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1127e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1128e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isFloat()) { 1129e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = SVal.getFloat().bitcastToAPInt(); 1130e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1131e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1132e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isVector()) { 1133e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType VecTy = E->getType(); 1134e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned VecSize = Info.Ctx.getTypeSize(VecTy); 1135e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType EltTy = VecTy->castAs<VectorType>()->getElementType(); 1136e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned EltSize = Info.Ctx.getTypeSize(EltTy); 1137e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); 1138e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = llvm::APInt::getNullValue(VecSize); 1139e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < SVal.getVectorLength(); i++) { 1140e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman APValue &Elt = SVal.getVectorElt(i); 1141e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt EltAsInt; 1142e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (Elt.isInt()) { 1143e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman EltAsInt = Elt.getInt(); 1144e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else if (Elt.isFloat()) { 1145e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman EltAsInt = Elt.getFloat().bitcastToAPInt(); 1146e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else { 1147e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Don't try to handle vectors of anything other than int or float 1148e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // (not sure if it's possible to hit this case). 1149e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1150e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1151e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1152e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned BaseEltSize = EltAsInt.getBitWidth(); 1153e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 1154e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res |= EltAsInt.zextOrTrunc(VecSize).rotr(i*EltSize+BaseEltSize); 1155e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 1156e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res |= EltAsInt.zextOrTrunc(VecSize).rotl(i*EltSize); 1157e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1158e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1159e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1160e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Give up if the input isn't an int, float, or vector. For example, we 1161e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // reject "(v4i16)(intptr_t)&a". 1162e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1163e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1164e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman} 1165e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman 1166b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// Cast an lvalue referring to a base subobject to a derived class, by 1167b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// truncating the lvalue's path to the given length. 1168b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool CastToDerivedClass(EvalInfo &Info, const Expr *E, LValue &Result, 1169b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const RecordDecl *TruncatedType, 1170b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned TruncatedElements) { 1171b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator &D = Result.Designator; 1172180f47959a066795cc0f409433023af448bb0328Richard Smith 1173b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check we actually point to a derived class object. 1174b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (TruncatedElements == D.Entries.size()) 1175b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 1176b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith assert(TruncatedElements >= D.MostDerivedPathLength && 1177b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith "not casting to a derived class"); 1178b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Result.checkSubobject(Info, E, CSK_Derived)) 1179180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1180180f47959a066795cc0f409433023af448bb0328Richard Smith 1181b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Truncate the path to the subobject, and remove any derived-to-base offsets. 1182e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const RecordDecl *RD = TruncatedType; 1183e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = TruncatedElements, N = D.Entries.size(); I != N; ++I) { 1184180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 1185180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Base = getAsBaseClass(D.Entries[I]); 1186e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isVirtualBaseClass(D.Entries[I])) 1187180f47959a066795cc0f409433023af448bb0328Richard Smith Result.Offset -= Layout.getVBaseClassOffset(Base); 1188e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith else 1189180f47959a066795cc0f409433023af448bb0328Richard Smith Result.Offset -= Layout.getBaseClassOffset(Base); 1190180f47959a066795cc0f409433023af448bb0328Richard Smith RD = Base; 1191180f47959a066795cc0f409433023af448bb0328Richard Smith } 1192e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith D.Entries.resize(TruncatedElements); 1193180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1194180f47959a066795cc0f409433023af448bb0328Richard Smith} 1195180f47959a066795cc0f409433023af448bb0328Richard Smith 1196b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic void HandleLValueDirectBase(EvalInfo &Info, const Expr *E, LValue &Obj, 1197180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Derived, 1198180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Base, 1199180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout *RL = 0) { 1200180f47959a066795cc0f409433023af448bb0328Richard Smith if (!RL) RL = &Info.Ctx.getASTRecordLayout(Derived); 1201180f47959a066795cc0f409433023af448bb0328Richard Smith Obj.getLValueOffset() += RL->getBaseClassOffset(Base); 1202b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj.addDecl(Info, E, Base, /*Virtual*/ false); 1203180f47959a066795cc0f409433023af448bb0328Richard Smith} 1204180f47959a066795cc0f409433023af448bb0328Richard Smith 1205b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleLValueBase(EvalInfo &Info, const Expr *E, LValue &Obj, 1206180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *DerivedDecl, 1207180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXBaseSpecifier *Base) { 1208180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *BaseDecl = Base->getType()->getAsCXXRecordDecl(); 1209180f47959a066795cc0f409433023af448bb0328Richard Smith 1210180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Base->isVirtual()) { 1211b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, E, Obj, DerivedDecl, BaseDecl); 1212180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1213180f47959a066795cc0f409433023af448bb0328Richard Smith } 1214180f47959a066795cc0f409433023af448bb0328Richard Smith 1215b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator &D = Obj.Designator; 1216b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.Invalid) 1217b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1218b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1219180f47959a066795cc0f409433023af448bb0328Richard Smith // Extract most-derived object and corresponding type. 1220b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith DerivedDecl = D.MostDerivedType->getAsCXXRecordDecl(); 1221b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!CastToDerivedClass(Info, E, Obj, DerivedDecl, D.MostDerivedPathLength)) 1222180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1223180f47959a066795cc0f409433023af448bb0328Richard Smith 1224b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Find the virtual base class. 1225180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(DerivedDecl); 1226180f47959a066795cc0f409433023af448bb0328Richard Smith Obj.getLValueOffset() += Layout.getVBaseClassOffset(BaseDecl); 1227b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj.addDecl(Info, E, BaseDecl, /*Virtual*/ true); 1228180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1229180f47959a066795cc0f409433023af448bb0328Richard Smith} 1230180f47959a066795cc0f409433023af448bb0328Richard Smith 1231180f47959a066795cc0f409433023af448bb0328Richard Smith/// Update LVal to refer to the given field, which must be a member of the type 1232180f47959a066795cc0f409433023af448bb0328Richard Smith/// currently described by LVal. 1233b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic void HandleLValueMember(EvalInfo &Info, const Expr *E, LValue &LVal, 1234180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *FD, 1235180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout *RL = 0) { 1236180f47959a066795cc0f409433023af448bb0328Richard Smith if (!RL) 1237180f47959a066795cc0f409433023af448bb0328Richard Smith RL = &Info.Ctx.getASTRecordLayout(FD->getParent()); 1238180f47959a066795cc0f409433023af448bb0328Richard Smith 1239180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned I = FD->getFieldIndex(); 1240180f47959a066795cc0f409433023af448bb0328Richard Smith LVal.Offset += Info.Ctx.toCharUnitsFromBits(RL->getFieldOffset(I)); 1241b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LVal.addDecl(Info, E, FD); 1242180f47959a066795cc0f409433023af448bb0328Richard Smith} 1243180f47959a066795cc0f409433023af448bb0328Richard Smith 1244d9b02e726262e4009dda830998bb934172ac0020Richard Smith/// Update LVal to refer to the given indirect field. 1245d9b02e726262e4009dda830998bb934172ac0020Richard Smithstatic void HandleLValueIndirectMember(EvalInfo &Info, const Expr *E, 1246d9b02e726262e4009dda830998bb934172ac0020Richard Smith LValue &LVal, 1247d9b02e726262e4009dda830998bb934172ac0020Richard Smith const IndirectFieldDecl *IFD) { 1248d9b02e726262e4009dda830998bb934172ac0020Richard Smith for (IndirectFieldDecl::chain_iterator C = IFD->chain_begin(), 1249d9b02e726262e4009dda830998bb934172ac0020Richard Smith CE = IFD->chain_end(); C != CE; ++C) 1250d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueMember(Info, E, LVal, cast<FieldDecl>(*C)); 1251d9b02e726262e4009dda830998bb934172ac0020Richard Smith} 1252d9b02e726262e4009dda830998bb934172ac0020Richard Smith 1253180f47959a066795cc0f409433023af448bb0328Richard Smith/// Get the size of the given type in char units. 1254180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool HandleSizeof(EvalInfo &Info, QualType Type, CharUnits &Size) { 1255180f47959a066795cc0f409433023af448bb0328Richard Smith // sizeof(void), __alignof__(void), sizeof(function) = 1 as a gcc 1256180f47959a066795cc0f409433023af448bb0328Richard Smith // extension. 1257180f47959a066795cc0f409433023af448bb0328Richard Smith if (Type->isVoidType() || Type->isFunctionType()) { 1258180f47959a066795cc0f409433023af448bb0328Richard Smith Size = CharUnits::One(); 1259180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1260180f47959a066795cc0f409433023af448bb0328Richard Smith } 1261180f47959a066795cc0f409433023af448bb0328Richard Smith 1262180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Type->isConstantSizeType()) { 1263180f47959a066795cc0f409433023af448bb0328Richard Smith // sizeof(vla) is not a constantexpr: C99 6.5.3.4p2. 1264b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // FIXME: Diagnostic. 1265180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1266180f47959a066795cc0f409433023af448bb0328Richard Smith } 1267180f47959a066795cc0f409433023af448bb0328Richard Smith 1268180f47959a066795cc0f409433023af448bb0328Richard Smith Size = Info.Ctx.getTypeSizeInChars(Type); 1269180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1270180f47959a066795cc0f409433023af448bb0328Richard Smith} 1271180f47959a066795cc0f409433023af448bb0328Richard Smith 1272180f47959a066795cc0f409433023af448bb0328Richard Smith/// Update a pointer value to model pointer arithmetic. 1273180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Info - Information about the ongoing evaluation. 1274b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// \param E - The expression being evaluated, for diagnostic purposes. 1275180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param LVal - The pointer value to be updated. 1276180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param EltTy - The pointee type represented by LVal. 1277180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Adjustment - The adjustment, in objects of type EltTy, to add. 1278b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleLValueArrayAdjustment(EvalInfo &Info, const Expr *E, 1279b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LValue &LVal, QualType EltTy, 1280b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith int64_t Adjustment) { 1281180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits SizeOfPointee; 1282180f47959a066795cc0f409433023af448bb0328Richard Smith if (!HandleSizeof(Info, EltTy, SizeOfPointee)) 1283180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1284180f47959a066795cc0f409433023af448bb0328Richard Smith 1285180f47959a066795cc0f409433023af448bb0328Richard Smith // Compute the new offset in the appropriate width. 1286180f47959a066795cc0f409433023af448bb0328Richard Smith LVal.Offset += Adjustment * SizeOfPointee; 1287b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LVal.adjustIndex(Info, E, Adjustment); 1288180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1289180f47959a066795cc0f409433023af448bb0328Richard Smith} 1290180f47959a066795cc0f409433023af448bb0328Richard Smith 129103f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith/// Try to evaluate the initializer for a variable declaration. 1292f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateVarDeclInit(EvalInfo &Info, const Expr *E, 1293f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const VarDecl *VD, 1294177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith CallStackFrame *Frame, CCValue &Result) { 1295d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // If this is a parameter to an active constexpr function call, perform 1296d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // argument substitution. 1297d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (const ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(VD)) { 1298745f5147e065900267c85a5568785a1991d4838fRichard Smith // Assume arguments of a potential constant expression are unknown 1299745f5147e065900267c85a5568785a1991d4838fRichard Smith // constant expressions. 1300745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression) 1301745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1302f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Frame || !Frame->Arguments) { 1303dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1304177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return false; 1305f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1306177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith Result = Frame->Arguments[PVD->getFunctionScopeIndex()]; 1307177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return true; 1308d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 130903f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1310099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Dig out the initializer, and use the declaration which it's attached to. 1311099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const Expr *Init = VD->getAnyInitializer(VD); 1312099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (!Init || Init->isValueDependent()) { 1313745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking a potential constant expression, the variable could be 1314745f5147e065900267c85a5568785a1991d4838fRichard Smith // initialized later. 1315745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckingPotentialConstantExpression) 1316745f5147e065900267c85a5568785a1991d4838fRichard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1317099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return false; 1318099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 1319099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 1320180f47959a066795cc0f409433023af448bb0328Richard Smith // If we're currently evaluating the initializer of this declaration, use that 1321180f47959a066795cc0f409433023af448bb0328Richard Smith // in-flight value. 1322180f47959a066795cc0f409433023af448bb0328Richard Smith if (Info.EvaluatingDecl == VD) { 1323b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result = CCValue(Info.Ctx, *Info.EvaluatingDeclValue, 1324b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CCValue::GlobalValue()); 1325180f47959a066795cc0f409433023af448bb0328Richard Smith return !Result.isUninit(); 1326180f47959a066795cc0f409433023af448bb0328Richard Smith } 1327180f47959a066795cc0f409433023af448bb0328Richard Smith 132865ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith // Never evaluate the initializer of a weak variable. We can't be sure that 132965ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith // this is the definition which will be used. 1330f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (VD->isWeak()) { 1331dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 133265ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith return false; 1333f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 133465ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith 1335099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Check that we can fold the initializer. In C++, we will have already done 1336099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // this in the cases where it matters for conformance. 1337099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 1338099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (!VD->evaluateValue(Notes)) { 1339099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_var_init_non_constant, 1340099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Notes.size() + 1) << VD; 1341099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 1342099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.addNotes(Notes); 134347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return false; 1344099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } else if (!VD->checkInitIsICE()) { 1345099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_var_init_non_constant, 1346099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Notes.size() + 1) << VD; 1347099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 1348099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.addNotes(Notes); 1349f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 135003f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1351b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result = CCValue(Info.Ctx, *VD->getEvaluatedValue(), CCValue::GlobalValue()); 135247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return true; 135303f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith} 135403f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1355c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithstatic bool IsConstNonVolatile(QualType T) { 135603f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith Qualifiers Quals = T.getQualifiers(); 135703f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith return Quals.hasConst() && !Quals.hasVolatile(); 135803f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith} 135903f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 136059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// Get the base index of the given base class within an APValue representing 136159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// the given derived class. 136259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic unsigned getBaseIndex(const CXXRecordDecl *Derived, 136359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base) { 136459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Base = Base->getCanonicalDecl(); 136559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith unsigned Index = 0; 136659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith for (CXXRecordDecl::base_class_const_iterator I = Derived->bases_begin(), 136759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith E = Derived->bases_end(); I != E; ++I, ++Index) { 136859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (I->getType()->getAsCXXRecordDecl()->getCanonicalDecl() == Base) 136959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return Index; 137059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 137159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 137259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith llvm_unreachable("base class missing from derived class's bases list"); 137359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 137459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1375cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith/// Extract the designated sub-object of an rvalue. 1376f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool ExtractSubobject(EvalInfo &Info, const Expr *E, 1377f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith CCValue &Obj, QualType ObjType, 1378cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const SubobjectDesignator &Sub, QualType SubType) { 1379b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Sub.Invalid) 1380b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A diagnostic will have already been produced. 1381cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1382b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Sub.isOnePastTheEnd()) { 13837098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), Info.getLangOpts().CPlusPlus0x ? 1384aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_constexpr_read_past_end : 1385aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_invalid_subexpr_in_const_expr); 13867098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 13877098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 1388f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smith if (Sub.Entries.empty()) 1389cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 1390745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression && Obj.isUninit()) 1391745f5147e065900267c85a5568785a1991d4838fRichard Smith // This object might be initialized later. 1392745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1393cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 1394cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith assert(!Obj.isLValue() && "extracting subobject of lvalue"); 1395cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const APValue *O = &Obj; 1396180f47959a066795cc0f409433023af448bb0328Richard Smith // Walk the designator's path to find the subobject. 1397cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith for (unsigned I = 0, N = Sub.Entries.size(); I != N; ++I) { 1398cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (ObjType->isArrayType()) { 1399180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is an array element. 1400cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(ObjType); 1401f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith assert(CAT && "vla in literal type?"); 1402cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith uint64_t Index = Sub.Entries[I].ArrayIndex; 1403f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (CAT->getSize().ule(Index)) { 14047098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Note, it should not be possible to form a pointer with a valid 14057098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // designator which points more than one past the end of the array. 14067098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), Info.getLangOpts().CPlusPlus0x ? 1407aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_constexpr_read_past_end : 1408aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_invalid_subexpr_in_const_expr); 1409cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1410f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1411cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (O->getArrayInitializedElts() > Index) 1412cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith O = &O->getArrayInitializedElt(Index); 1413cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith else 1414cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith O = &O->getArrayFiller(); 1415cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith ObjType = CAT->getElementType(); 1416180f47959a066795cc0f409433023af448bb0328Richard Smith } else if (const FieldDecl *Field = getAsField(Sub.Entries[I])) { 1417180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is a class, struct or union field. 1418180f47959a066795cc0f409433023af448bb0328Richard Smith RecordDecl *RD = ObjType->castAs<RecordType>()->getDecl(); 1419180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 1420180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *UnionField = O->getUnionField(); 1421180f47959a066795cc0f409433023af448bb0328Richard Smith if (!UnionField || 1422f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith UnionField->getCanonicalDecl() != Field->getCanonicalDecl()) { 14237098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), 14247098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith diag::note_constexpr_read_inactive_union_member) 14257098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith << Field << !UnionField << UnionField; 1426180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1427f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1428180f47959a066795cc0f409433023af448bb0328Richard Smith O = &O->getUnionValue(); 1429180f47959a066795cc0f409433023af448bb0328Richard Smith } else 1430180f47959a066795cc0f409433023af448bb0328Richard Smith O = &O->getStructField(Field->getFieldIndex()); 1431180f47959a066795cc0f409433023af448bb0328Richard Smith ObjType = Field->getType(); 14327098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 14337098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (ObjType.isVolatileQualified()) { 14347098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 14357098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // FIXME: Include a description of the path to the volatile subobject. 14367098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_ltor_volatile_obj, 1) 14377098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith << 2 << Field; 14387098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(Field->getLocation(), diag::note_declared_at); 14397098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 14407098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 14417098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 14427098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 14437098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 1444cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } else { 1445180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is a base class. 144659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Derived = ObjType->getAsCXXRecordDecl(); 144759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base = getAsBaseClass(Sub.Entries[I]); 144859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith O = &O->getStructBase(getBaseIndex(Derived, Base)); 144959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith ObjType = Info.Ctx.getRecordType(Base); 1450cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 1451180f47959a066795cc0f409433023af448bb0328Richard Smith 1452f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (O->isUninit()) { 1453745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckingPotentialConstantExpression) 1454745f5147e065900267c85a5568785a1991d4838fRichard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_read_uninit); 1455180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1456f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1457cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 1458cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 1459b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj = CCValue(Info.Ctx, *O, CCValue::GlobalValue()); 1460cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 1461cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 1462cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 1463180f47959a066795cc0f409433023af448bb0328Richard Smith/// HandleLValueToRValueConversion - Perform an lvalue-to-rvalue conversion on 1464180f47959a066795cc0f409433023af448bb0328Richard Smith/// the given lvalue. This can also be used for 'lvalue-to-lvalue' conversions 1465180f47959a066795cc0f409433023af448bb0328Richard Smith/// for looking up the glvalue referred to by an entity of reference type. 1466180f47959a066795cc0f409433023af448bb0328Richard Smith/// 1467180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Info - Information about the ongoing evaluation. 1468f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// \param Conv - The expression for which we are performing the conversion. 1469f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Used for diagnostics. 1470180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Type - The type we expect this conversion to produce. 1471180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param LVal - The glvalue on which we are attempting to perform this action. 1472180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param RVal - The produced value will be placed here. 1473f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool HandleLValueToRValueConversion(EvalInfo &Info, const Expr *Conv, 1474f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith QualType Type, 1475cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const LValue &LVal, CCValue &RVal) { 14767098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // In C, an lvalue-to-rvalue conversion is never a constant expression. 14777098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!Info.getLangOpts().CPlusPlus) 14787098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.CCEDiag(Conv->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 14797098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 1480b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (LVal.Designator.Invalid) 1481b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A diagnostic will have already been produced. 1482b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1483b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 14841bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const Expr *Base = LVal.Base.dyn_cast<const Expr*>(); 1485177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith CallStackFrame *Frame = LVal.Frame; 14867098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith SourceLocation Loc = Conv->getExprLoc(); 1487c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1488f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LVal.Base) { 1489f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: Indirection through a null pointer deserves a specific diagnostic. 14907098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_invalid_subexpr_in_const_expr); 14917098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 14927098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 14937098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 14947098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // C++11 DR1311: An lvalue-to-rvalue conversion on a volatile-qualified type 14957098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // is not a constant expression (even if the object is non-volatile). We also 14967098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // apply this rule to C++98, in order to conform to the expected 'volatile' 14977098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // semantics. 14987098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Type.isVolatileQualified()) { 14997098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) 15007098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_volatile_type) << Type; 15017098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith else 15027098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 1503c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1504f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1505c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 15061bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = LVal.Base.dyn_cast<const ValueDecl*>()) { 1507c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C++98, const, non-volatile integers initialized with ICEs are ICEs. 1508c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C++11, constexpr, non-volatile variables initialized with constant 1509d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // expressions are constant expressions too. Inside constexpr functions, 1510d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // parameters are constant expressions even if they're non-const. 1511c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C, such things can also be folded, although they are not ICEs. 1512c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith const VarDecl *VD = dyn_cast<VarDecl>(D); 1513f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!VD || VD->isInvalidDecl()) { 15147098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 15150a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1516f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1517f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 15187098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // DR1313: If the object is volatile-qualified but the glvalue was not, 15197098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // behavior is undefined so the result is not a constant expression. 15201bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType VT = VD->getType(); 15217098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (VT.isVolatileQualified()) { 15227098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 15237098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_volatile_obj, 1) << 1 << VD; 15247098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 15257098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 15267098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 1527f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 15287098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 15297098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 15307098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 15317098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!isa<ParmVarDecl>(VD)) { 15327098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (VD->isConstexpr()) { 15337098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // OK, we can read this variable. 15347098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else if (VT->isIntegralOrEnumerationType()) { 15357098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!VT.isConstQualified()) { 15367098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 15377098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_non_const_int, 1) << VD; 15387098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 15397098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 15407098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 15417098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 15427098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 15437098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 15447098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else if (VT->isFloatingType() && VT.isConstQualified()) { 15457098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // We support folding of const floating-point types, in order to make 15467098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // static const data members of such types (supported as an extension) 15477098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // more useful. 15487098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 15497098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.CCEDiag(Loc, diag::note_constexpr_ltor_non_constexpr, 1) << VD; 15507098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 15517098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 15527098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.CCEDiag(Loc); 15537098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 15547098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 15557098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // FIXME: Allow folding of values of any literal type in all languages. 15567098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 15577098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_non_constexpr, 1) << VD; 15587098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 15597098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 15607098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 15617098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 15620a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1563f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 15640a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 15657098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 1566f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateVarDeclInit(Info, Conv, VD, Frame, RVal)) 1567c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1568c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 156947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith if (isa<ParmVarDecl>(VD) || !VD->getAnyInitializer()->isLValue()) 1570f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, Conv, RVal, VT, LVal.Designator, Type); 1571c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1572c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // The declaration was initialized by an lvalue, with no lvalue-to-rvalue 1573c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // conversion. This happens when the declaration and the lvalue should be 1574c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // considered synonymous, for instance when initializing an array of char 1575c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // from a string literal. Continue as if the initializer lvalue was the 1576c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // value we were originally given. 15770a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith assert(RVal.getLValueOffset().isZero() && 15780a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith "offset for lvalue init of non-reference"); 15791bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Base = RVal.getLValueBase().get<const Expr*>(); 1580177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith Frame = RVal.getLValueFrame(); 1581c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 1582c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 15837098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Volatile temporary objects cannot be read in constant expressions. 15847098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Base->getType().isVolatileQualified()) { 15857098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 15867098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_volatile_obj, 1) << 0; 15877098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(Base->getExprLoc(), diag::note_constexpr_temporary_here); 15887098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 15897098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 15907098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 15917098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 15927098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 15937098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 15940a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith // FIXME: Support PredefinedExpr, ObjCEncodeExpr, MakeStringConstant 15950a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (const StringLiteral *S = dyn_cast<StringLiteral>(Base)) { 15960a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &Designator = LVal.Designator; 1597f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Designator.Invalid || Designator.Entries.size() != 1) { 1598dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(Conv->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 15990a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1600f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 16010a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 16020a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith assert(Type->isIntegerType() && "string element not integer type"); 16039a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith uint64_t Index = Designator.Entries[0].ArrayIndex; 16047098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith const ConstantArrayType *CAT = 16057098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Ctx.getAsConstantArrayType(S->getType()); 16067098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Index >= CAT->getSize().getZExtValue()) { 16077098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Note, it should not be possible to form a pointer which points more 16087098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // than one past the end of the array without producing a prior const expr 16097098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // diagnostic. 16107098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_read_past_end); 16110a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1612f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 16130a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith APSInt Value(S->getCharByteWidth() * Info.Ctx.getCharWidth(), 16140a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Type->isUnsignedIntegerType()); 16150a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (Index < S->getLength()) 16160a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Value = S->getCodeUnit(Index); 16170a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith RVal = CCValue(Value); 16180a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 16190a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 16200a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 1621177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (Frame) { 1622cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // If this is a temporary expression with a nontrivial initializer, grab the 1623cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // value from the relevant stack frame. 1624177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith RVal = Frame->Temporaries[Base]; 1625cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } else if (const CompoundLiteralExpr *CLE 1626cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith = dyn_cast<CompoundLiteralExpr>(Base)) { 1627cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // In C99, a CompoundLiteralExpr is an lvalue, and we defer evaluating the 1628cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // initializer until now for such expressions. Such an expression can't be 1629cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // an ICE in C, so this only matters for fold. 1630c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(!Info.getLangOpts().CPlusPlus && "lvalue compound literal in c++?"); 1631cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (!Evaluate(RVal, Info, CLE->getInitializer())) 1632cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1633f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } else { 1634dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(Conv->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1635cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1636f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1637c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1638f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, Conv, RVal, Base->getType(), LVal.Designator, 1639f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Type); 1640c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 1641c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 164259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// Build an lvalue for the object argument of a member function call. 164359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic bool EvaluateObjectArgument(EvalInfo &Info, const Expr *Object, 164459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith LValue &This) { 164559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (Object->getType()->isPointerType()) 164659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return EvaluatePointer(Object, This, Info); 164759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 164859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (Object->isGLValue()) 164959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return EvaluateLValue(Object, This, Info); 165059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1651e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Object->getType()->isLiteralType()) 1652e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateTemporary(Object, This, Info); 1653e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1654e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 1655e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 1656e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1657e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// HandleMemberPointerAccess - Evaluate a member access operation and build an 1658e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// lvalue referring to the result. 1659e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// 1660e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param Info - Information about the ongoing evaluation. 1661e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param BO - The member pointer access operation. 1662e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param LV - Filled in with a reference to the resulting object. 1663e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param IncludeMember - Specifies whether the member itself is included in 1664e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// the resulting LValue subobject designator. This is not possible when 1665e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// creating a bound member function. 1666e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \return The field or method declaration to which the member pointer refers, 1667e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// or 0 if evaluation fails. 1668e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic const ValueDecl *HandleMemberPointerAccess(EvalInfo &Info, 1669e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const BinaryOperator *BO, 1670e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &LV, 1671e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool IncludeMember = true) { 1672e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(BO->getOpcode() == BO_PtrMemD || BO->getOpcode() == BO_PtrMemI); 1673e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1674745f5147e065900267c85a5568785a1991d4838fRichard Smith bool EvalObjOK = EvaluateObjectArgument(Info, BO->getLHS(), LV); 1675745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalObjOK && !Info.keepEvaluatingAfterFailure()) 1676e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1677e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1678e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr MemPtr; 1679e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateMemberPointer(BO->getRHS(), MemPtr, Info)) 1680e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1681e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1682e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.mptr.oper]p6: If the second operand is the null pointer to 1683e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // member value, the behavior is undefined. 1684e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!MemPtr.getDecl()) 1685e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1686e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1687745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalObjOK) 1688745f5147e065900267c85a5568785a1991d4838fRichard Smith return 0; 1689745f5147e065900267c85a5568785a1991d4838fRichard Smith 1690e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (MemPtr.isDerivedMember()) { 1691e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // This is a member of some derived class. Truncate LV appropriately. 1692e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // The end of the derived-to-base path for the base object must match the 1693e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // derived-to-base path for the member pointer. 1694b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (LV.Designator.MostDerivedPathLength + MemPtr.Path.size() > 1695e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.size()) 1696e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1697e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith unsigned PathLengthToMember = 1698e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.size() - MemPtr.Path.size(); 1699e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = 0, N = MemPtr.Path.size(); I != N; ++I) { 1700e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *LVDecl = getAsBaseClass( 1701e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries[PathLengthToMember + I]); 1702e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *MPDecl = MemPtr.Path[I]; 1703e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (LVDecl->getCanonicalDecl() != MPDecl->getCanonicalDecl()) 1704e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1705e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1706e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1707e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Truncate the lvalue to the appropriate derived class. 1708b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!CastToDerivedClass(Info, BO, LV, MemPtr.getContainingRecord(), 1709b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith PathLengthToMember)) 1710b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return 0; 1711e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else if (!MemPtr.Path.empty()) { 1712e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Extend the LValue path with the member pointer's path. 1713e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.reserve(LV.Designator.Entries.size() + 1714e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemPtr.Path.size() + IncludeMember); 1715e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1716e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Walk down to the appropriate base class. 1717e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType LVType = BO->getLHS()->getType(); 1718e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const PointerType *PT = LVType->getAs<PointerType>()) 1719e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LVType = PT->getPointeeType(); 1720e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *RD = LVType->getAsCXXRecordDecl(); 1721e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(RD && "member pointer access on non-class-type expression"); 1722e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // The first class in the path is that of the lvalue. 1723e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = 1, N = MemPtr.Path.size(); I != N; ++I) { 1724e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Base = MemPtr.Path[N - I - 1]; 1725b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, BO, LV, RD, Base); 1726e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RD = Base; 1727e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1728e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Finally cast to the class containing the member. 1729b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, BO, LV, RD, MemPtr.getContainingRecord()); 1730e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1731e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1732e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Add the member. Note that we cannot build bound member functions here. 1733e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (IncludeMember) { 1734d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(MemPtr.getDecl())) 1735d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueMember(Info, BO, LV, FD); 1736d9b02e726262e4009dda830998bb934172ac0020Richard Smith else if (const IndirectFieldDecl *IFD = 1737d9b02e726262e4009dda830998bb934172ac0020Richard Smith dyn_cast<IndirectFieldDecl>(MemPtr.getDecl())) 1738d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueIndirectMember(Info, BO, LV, IFD); 1739d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 1740d9b02e726262e4009dda830998bb934172ac0020Richard Smith llvm_unreachable("can't construct reference to bound member function"); 1741e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1742e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1743e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return MemPtr.getDecl(); 1744e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 1745e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1746e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// HandleBaseToDerivedCast - Apply the given base-to-derived cast operation on 1747e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// the provided lvalue, which currently refers to the base object. 1748e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool HandleBaseToDerivedCast(EvalInfo &Info, const CastExpr *E, 1749e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &Result) { 1750e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith SubobjectDesignator &D = Result.Designator; 1751b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.Invalid || !Result.checkNullPointer(Info, E, CSK_Derived)) 1752e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 1753e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1754e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType TargetQT = E->getType(); 1755e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const PointerType *PT = TargetQT->getAs<PointerType>()) 1756e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith TargetQT = PT->getPointeeType(); 1757b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1758b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check this cast lands within the final derived-to-base subobject path. 1759b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.MostDerivedPathLength + E->path_size() > D.Entries.size()) { 1760b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_invalid_downcast) 1761b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << D.MostDerivedType << TargetQT; 1762b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1763b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1764b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1765b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check the type of the final cast. We don't need to check the path, 1766b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // since a cast can only be formed if the path is unique. 1767b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned NewEntriesSize = D.Entries.size() - E->path_size(); 1768e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *TargetType = TargetQT->getAsCXXRecordDecl(); 1769e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *FinalType; 1770b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (NewEntriesSize == D.MostDerivedPathLength) 1771b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith FinalType = D.MostDerivedType->getAsCXXRecordDecl(); 1772b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 1773e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith FinalType = getAsBaseClass(D.Entries[NewEntriesSize - 1]); 1774b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (FinalType->getCanonicalDecl() != TargetType->getCanonicalDecl()) { 1775b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_invalid_downcast) 1776b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << D.MostDerivedType << TargetQT; 1777e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 1778b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1779e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1780e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Truncate the lvalue to the appropriate derived class. 1781b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return CastToDerivedClass(Info, E, Result, TargetType, NewEntriesSize); 178259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 178359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1784c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stumpnamespace { 1785d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smithenum EvalStmtResult { 1786d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Evaluation failed. 1787d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Failed, 1788d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Hit a 'return' statement. 1789d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Returned, 1790d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Evaluation succeeded. 1791d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Succeeded 1792d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith}; 1793d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 1794d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 1795d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith// Evaluate a statement. 1796c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic EvalStmtResult EvaluateStmt(APValue &Result, EvalInfo &Info, 1797d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith const Stmt *S) { 1798d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith switch (S->getStmtClass()) { 1799d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith default: 1800d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Failed; 1801d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 1802d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::NullStmtClass: 1803d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::DeclStmtClass: 1804d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Succeeded; 1805d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 1806c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith case Stmt::ReturnStmtClass: { 1807c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCValue CCResult; 1808c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const Expr *RetExpr = cast<ReturnStmt>(S)->getRetValue(); 1809c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!Evaluate(CCResult, Info, RetExpr) || 1810c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith !CheckConstantExpression(Info, RetExpr, CCResult, Result, 1811c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_ReturnValue)) 1812c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return ESR_Failed; 1813c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return ESR_Returned; 1814c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 1815d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 1816d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::CompoundStmtClass: { 1817d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith const CompoundStmt *CS = cast<CompoundStmt>(S); 1818d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith for (CompoundStmt::const_body_iterator BI = CS->body_begin(), 1819d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith BE = CS->body_end(); BI != BE; ++BI) { 1820d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith EvalStmtResult ESR = EvaluateStmt(Result, Info, *BI); 1821d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (ESR != ESR_Succeeded) 1822d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR; 1823d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 1824d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Succeeded; 1825d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 1826d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 1827d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 1828d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 18296180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// CheckTrivialDefaultConstructor - Check whether a constructor is a trivial 18306180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// default constructor. If so, we'll fold it whether or not it's marked as 18316180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// constexpr. If it is marked as constexpr, we will never implicitly define it, 18326180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// so we need special handling. 18336180245e9f63d2927b185ec251fb75aba30f1cacRichard Smithstatic bool CheckTrivialDefaultConstructor(EvalInfo &Info, SourceLocation Loc, 183451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXConstructorDecl *CD, 183551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool IsValueInitialization) { 18366180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (!CD->isTrivial() || !CD->isDefaultConstructor()) 18376180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return false; 18386180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 18394c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // Value-initialization does not call a trivial default constructor, so such a 18404c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // call is a core constant expression whether or not the constructor is 18414c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // constexpr. 18424c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!CD->isConstexpr() && !IsValueInitialization) { 18436180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (Info.getLangOpts().CPlusPlus0x) { 18444c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // FIXME: If DiagDecl is an implicitly-declared special member function, 18454c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // we should be much more explicit about why it's not constexpr. 18464c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Info.CCEDiag(Loc, diag::note_constexpr_invalid_function, 1) 18474c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith << /*IsConstexpr*/0 << /*IsConstructor*/1 << CD; 18484c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Info.Note(CD->getLocation(), diag::note_declared_at); 18496180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } else { 18506180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Info.CCEDiag(Loc, diag::note_invalid_subexpr_in_const_expr); 18516180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 18526180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 18536180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 18546180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith} 18556180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 1856c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith/// CheckConstexprFunction - Check that a function can be called in a constant 1857c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith/// expression. 1858c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool CheckConstexprFunction(EvalInfo &Info, SourceLocation CallLoc, 1859c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Declaration, 1860c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Definition) { 1861745f5147e065900267c85a5568785a1991d4838fRichard Smith // Potential constant expressions can contain calls to declared, but not yet 1862745f5147e065900267c85a5568785a1991d4838fRichard Smith // defined, constexpr functions. 1863745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression && !Definition && 1864745f5147e065900267c85a5568785a1991d4838fRichard Smith Declaration->isConstexpr()) 1865745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1866745f5147e065900267c85a5568785a1991d4838fRichard Smith 1867c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith // Can we evaluate this function call? 1868c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Definition && Definition->isConstexpr() && !Definition->isInvalidDecl()) 1869c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1870c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 1871c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 1872c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *DiagDecl = Definition ? Definition : Declaration; 1873099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // FIXME: If DiagDecl is an implicitly-declared special member function, we 1874099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // should be much more explicit about why it's not constexpr. 1875c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(CallLoc, diag::note_constexpr_invalid_function, 1) 1876c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << DiagDecl->isConstexpr() << isa<CXXConstructorDecl>(DiagDecl) 1877c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << DiagDecl; 1878c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Note(DiagDecl->getLocation(), diag::note_declared_at); 1879c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else { 1880c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(CallLoc, diag::note_invalid_subexpr_in_const_expr); 1881c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 1882c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 1883c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith} 1884c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 1885180f47959a066795cc0f409433023af448bb0328Richard Smithnamespace { 1886cd99b072e8b32075da6233cbf14ea58a5c82de4fRichard Smithtypedef SmallVector<CCValue, 8> ArgVector; 1887180f47959a066795cc0f409433023af448bb0328Richard Smith} 1888180f47959a066795cc0f409433023af448bb0328Richard Smith 1889180f47959a066795cc0f409433023af448bb0328Richard Smith/// EvaluateArgs - Evaluate the arguments to a function call. 1890180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateArgs(ArrayRef<const Expr*> Args, ArgVector &ArgValues, 1891180f47959a066795cc0f409433023af448bb0328Richard Smith EvalInfo &Info) { 1892745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 1893180f47959a066795cc0f409433023af448bb0328Richard Smith for (ArrayRef<const Expr*>::iterator I = Args.begin(), E = Args.end(); 1894745f5147e065900267c85a5568785a1991d4838fRichard Smith I != E; ++I) { 1895745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Evaluate(ArgValues[I - Args.begin()], Info, *I)) { 1896745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking for a potential constant expression, evaluate all 1897745f5147e065900267c85a5568785a1991d4838fRichard Smith // initializers even if some of them fail. 1898745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 1899745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1900745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 1901745f5147e065900267c85a5568785a1991d4838fRichard Smith } 1902745f5147e065900267c85a5568785a1991d4838fRichard Smith } 1903745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 1904180f47959a066795cc0f409433023af448bb0328Richard Smith} 1905180f47959a066795cc0f409433023af448bb0328Richard Smith 1906d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith/// Evaluate a function call. 1907745f5147e065900267c85a5568785a1991d4838fRichard Smithstatic bool HandleFunctionCall(SourceLocation CallLoc, 1908745f5147e065900267c85a5568785a1991d4838fRichard Smith const FunctionDecl *Callee, const LValue *This, 1909f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ArrayRef<const Expr*> Args, const Stmt *Body, 1910c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith EvalInfo &Info, APValue &Result) { 1911180f47959a066795cc0f409433023af448bb0328Richard Smith ArgVector ArgValues(Args.size()); 1912180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArgs(Args, ArgValues, Info)) 1913180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1914d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 1915745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckCallLimit(CallLoc)) 1916745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1917745f5147e065900267c85a5568785a1991d4838fRichard Smith 1918745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackFrame Frame(Info, CallLoc, Callee, This, ArgValues.data()); 1919d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return EvaluateStmt(Result, Info, Body) == ESR_Returned; 1920d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 1921d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 1922180f47959a066795cc0f409433023af448bb0328Richard Smith/// Evaluate a constructor call. 1923745f5147e065900267c85a5568785a1991d4838fRichard Smithstatic bool HandleConstructorCall(SourceLocation CallLoc, const LValue &This, 192459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith ArrayRef<const Expr*> Args, 1925180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXConstructorDecl *Definition, 192651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith EvalInfo &Info, APValue &Result) { 1927180f47959a066795cc0f409433023af448bb0328Richard Smith ArgVector ArgValues(Args.size()); 1928180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArgs(Args, ArgValues, Info)) 1929180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1930180f47959a066795cc0f409433023af448bb0328Richard Smith 1931745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckCallLimit(CallLoc)) 1932745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1933745f5147e065900267c85a5568785a1991d4838fRichard Smith 1934745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackFrame Frame(Info, CallLoc, Definition, &This, ArgValues.data()); 1935180f47959a066795cc0f409433023af448bb0328Richard Smith 1936180f47959a066795cc0f409433023af448bb0328Richard Smith // If it's a delegating constructor, just delegate. 1937180f47959a066795cc0f409433023af448bb0328Richard Smith if (Definition->isDelegatingConstructor()) { 1938180f47959a066795cc0f409433023af448bb0328Richard Smith CXXConstructorDecl::init_const_iterator I = Definition->init_begin(); 1939180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateConstantExpression(Result, Info, This, (*I)->getInit()); 1940180f47959a066795cc0f409433023af448bb0328Richard Smith } 1941180f47959a066795cc0f409433023af448bb0328Richard Smith 1942610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // For a trivial copy or move constructor, perform an APValue copy. This is 1943610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // essential for unions, where the operations performed by the constructor 1944610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // cannot be represented by ctor-initializers. 1945180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *RD = Definition->getParent(); 1946610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith if (Definition->isDefaulted() && 1947610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith ((Definition->isCopyConstructor() && RD->hasTrivialCopyConstructor()) || 1948610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith (Definition->isMoveConstructor() && RD->hasTrivialMoveConstructor()))) { 1949610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith LValue RHS; 1950610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith RHS.setFrom(ArgValues[0]); 1951610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith CCValue Value; 1952745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!HandleLValueToRValueConversion(Info, Args[0], Args[0]->getType(), 1953745f5147e065900267c85a5568785a1991d4838fRichard Smith RHS, Value)) 1954745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1955745f5147e065900267c85a5568785a1991d4838fRichard Smith assert((Value.isStruct() || Value.isUnion()) && 1956745f5147e065900267c85a5568785a1991d4838fRichard Smith "trivial copy/move from non-class type?"); 1957745f5147e065900267c85a5568785a1991d4838fRichard Smith // Any CCValue of class type must already be a constant expression. 1958745f5147e065900267c85a5568785a1991d4838fRichard Smith Result = Value; 1959745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 1960610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith } 1961610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith 1962610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // Reserve space for the struct members. 196351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!RD->isUnion() && Result.isUninit()) 1964180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitStruct(), RD->getNumBases(), 1965180f47959a066795cc0f409433023af448bb0328Richard Smith std::distance(RD->field_begin(), RD->field_end())); 1966180f47959a066795cc0f409433023af448bb0328Richard Smith 1967180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 1968180f47959a066795cc0f409433023af448bb0328Richard Smith 1969745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 1970180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned BasesSeen = 0; 1971180f47959a066795cc0f409433023af448bb0328Richard Smith#ifndef NDEBUG 1972180f47959a066795cc0f409433023af448bb0328Richard Smith CXXRecordDecl::base_class_const_iterator BaseIt = RD->bases_begin(); 1973180f47959a066795cc0f409433023af448bb0328Richard Smith#endif 1974180f47959a066795cc0f409433023af448bb0328Richard Smith for (CXXConstructorDecl::init_const_iterator I = Definition->init_begin(), 1975180f47959a066795cc0f409433023af448bb0328Richard Smith E = Definition->init_end(); I != E; ++I) { 1976745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue Subobject = This; 1977745f5147e065900267c85a5568785a1991d4838fRichard Smith APValue *Value = &Result; 1978745f5147e065900267c85a5568785a1991d4838fRichard Smith 1979745f5147e065900267c85a5568785a1991d4838fRichard Smith // Determine the subobject to initialize. 1980180f47959a066795cc0f409433023af448bb0328Richard Smith if ((*I)->isBaseInitializer()) { 1981180f47959a066795cc0f409433023af448bb0328Richard Smith QualType BaseType((*I)->getBaseClass(), 0); 1982180f47959a066795cc0f409433023af448bb0328Richard Smith#ifndef NDEBUG 1983180f47959a066795cc0f409433023af448bb0328Richard Smith // Non-virtual base classes are initialized in the order in the class 1984180f47959a066795cc0f409433023af448bb0328Richard Smith // definition. We cannot have a virtual base class for a literal type. 1985180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!BaseIt->isVirtual() && "virtual base for literal type"); 1986180f47959a066795cc0f409433023af448bb0328Richard Smith assert(Info.Ctx.hasSameType(BaseIt->getType(), BaseType) && 1987180f47959a066795cc0f409433023af448bb0328Richard Smith "base class initializers not in expected order"); 1988180f47959a066795cc0f409433023af448bb0328Richard Smith ++BaseIt; 1989180f47959a066795cc0f409433023af448bb0328Richard Smith#endif 1990b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, (*I)->getInit(), Subobject, RD, 1991180f47959a066795cc0f409433023af448bb0328Richard Smith BaseType->getAsCXXRecordDecl(), &Layout); 1992745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getStructBase(BasesSeen++); 1993180f47959a066795cc0f409433023af448bb0328Richard Smith } else if (FieldDecl *FD = (*I)->getMember()) { 1994b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, (*I)->getInit(), Subobject, FD, &Layout); 1995180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 1996180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(FD); 1997745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getUnionValue(); 1998745f5147e065900267c85a5568785a1991d4838fRichard Smith } else { 1999745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getStructField(FD->getFieldIndex()); 2000745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2001d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else if (IndirectFieldDecl *IFD = (*I)->getIndirectMember()) { 2002d9b02e726262e4009dda830998bb934172ac0020Richard Smith // Walk the indirect field decl's chain to find the object to initialize, 2003d9b02e726262e4009dda830998bb934172ac0020Richard Smith // and make sure we've initialized every step along it. 2004d9b02e726262e4009dda830998bb934172ac0020Richard Smith for (IndirectFieldDecl::chain_iterator C = IFD->chain_begin(), 2005d9b02e726262e4009dda830998bb934172ac0020Richard Smith CE = IFD->chain_end(); 2006d9b02e726262e4009dda830998bb934172ac0020Richard Smith C != CE; ++C) { 2007d9b02e726262e4009dda830998bb934172ac0020Richard Smith FieldDecl *FD = cast<FieldDecl>(*C); 2008d9b02e726262e4009dda830998bb934172ac0020Richard Smith CXXRecordDecl *CD = cast<CXXRecordDecl>(FD->getParent()); 2009d9b02e726262e4009dda830998bb934172ac0020Richard Smith // Switch the union field if it differs. This happens if we had 2010d9b02e726262e4009dda830998bb934172ac0020Richard Smith // preceding zero-initialization, and we're now initializing a union 2011d9b02e726262e4009dda830998bb934172ac0020Richard Smith // subobject other than the first. 2012d9b02e726262e4009dda830998bb934172ac0020Richard Smith // FIXME: In this case, the values of the other subobjects are 2013d9b02e726262e4009dda830998bb934172ac0020Richard Smith // specified, since zero-initialization sets all padding bits to zero. 2014d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (Value->isUninit() || 2015d9b02e726262e4009dda830998bb934172ac0020Richard Smith (Value->isUnion() && Value->getUnionField() != FD)) { 2016d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (CD->isUnion()) 2017d9b02e726262e4009dda830998bb934172ac0020Richard Smith *Value = APValue(FD); 2018d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 2019d9b02e726262e4009dda830998bb934172ac0020Richard Smith *Value = APValue(APValue::UninitStruct(), CD->getNumBases(), 2020d9b02e726262e4009dda830998bb934172ac0020Richard Smith std::distance(CD->field_begin(), CD->field_end())); 2021d9b02e726262e4009dda830998bb934172ac0020Richard Smith } 2022745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleLValueMember(Info, (*I)->getInit(), Subobject, FD); 2023d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (CD->isUnion()) 2024d9b02e726262e4009dda830998bb934172ac0020Richard Smith Value = &Value->getUnionValue(); 2025d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 2026d9b02e726262e4009dda830998bb934172ac0020Richard Smith Value = &Value->getStructField(FD->getFieldIndex()); 2027d9b02e726262e4009dda830998bb934172ac0020Richard Smith } 2028180f47959a066795cc0f409433023af448bb0328Richard Smith } else { 2029d9b02e726262e4009dda830998bb934172ac0020Richard Smith llvm_unreachable("unknown base initializer kind"); 2030180f47959a066795cc0f409433023af448bb0328Richard Smith } 2031745f5147e065900267c85a5568785a1991d4838fRichard Smith 2032745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateConstantExpression(*Value, Info, Subobject, (*I)->getInit(), 2033745f5147e065900267c85a5568785a1991d4838fRichard Smith (*I)->isBaseInitializer() 2034745f5147e065900267c85a5568785a1991d4838fRichard Smith ? CCEK_Constant : CCEK_MemberInit)) { 2035745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking for a potential constant expression, evaluate all 2036745f5147e065900267c85a5568785a1991d4838fRichard Smith // initializers even if some of them fail. 2037745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 2038745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2039745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 2040745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2041180f47959a066795cc0f409433023af448bb0328Richard Smith } 2042180f47959a066795cc0f409433023af448bb0328Richard Smith 2043745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 2044180f47959a066795cc0f409433023af448bb0328Richard Smith} 2045180f47959a066795cc0f409433023af448bb0328Richard Smith 2046d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smithnamespace { 2047770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass HasSideEffect 20488cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ConstStmtVisitor<HasSideEffect, bool> { 20491e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith const ASTContext &Ctx; 2050c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stumppublic: 2051c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 20521e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith HasSideEffect(const ASTContext &C) : Ctx(C) {} 2053c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 2054c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // Unhandled nodes conservatively default to having side effects. 20558cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStmt(const Stmt *S) { 2056c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 2057c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 2058c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 20598cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitParenExpr(const ParenExpr *E) { return Visit(E->getSubExpr()); } 20608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitGenericSelectionExpr(const GenericSelectionExpr *E) { 2061f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne return Visit(E->getResultExpr()); 2062f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne } 20638cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitDeclRefExpr(const DeclRefExpr *E) { 20641e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2065c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 2066c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return false; 2067c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 2068f85e193739c953358c865005855253af4f68a497John McCall bool VisitObjCIvarRefExpr(const ObjCIvarRefExpr *E) { 20691e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2070f85e193739c953358c865005855253af4f68a497John McCall return true; 2071f85e193739c953358c865005855253af4f68a497John McCall return false; 2072f85e193739c953358c865005855253af4f68a497John McCall } 2073f85e193739c953358c865005855253af4f68a497John McCall bool VisitBlockDeclRefExpr (const BlockDeclRefExpr *E) { 20741e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2075f85e193739c953358c865005855253af4f68a497John McCall return true; 2076f85e193739c953358c865005855253af4f68a497John McCall return false; 2077f85e193739c953358c865005855253af4f68a497John McCall } 2078f85e193739c953358c865005855253af4f68a497John McCall 2079c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // We don't want to evaluate BlockExprs multiple times, as they generate 2080c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // a ton of code. 20818cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBlockExpr(const BlockExpr *E) { return true; } 20828cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitPredefinedExpr(const PredefinedExpr *E) { return false; } 20838cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) 2084c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump { return Visit(E->getInitializer()); } 20858cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitMemberExpr(const MemberExpr *E) { return Visit(E->getBase()); } 20868cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitIntegerLiteral(const IntegerLiteral *E) { return false; } 20878cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitFloatingLiteral(const FloatingLiteral *E) { return false; } 20888cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStringLiteral(const StringLiteral *E) { return false; } 20898cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCharacterLiteral(const CharacterLiteral *E) { return false; } 20908cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E) 2091f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne { return false; } 20928cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E) 2093980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump { return Visit(E->getLHS()) || Visit(E->getRHS()); } 20948cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitChooseExpr(const ChooseExpr *E) 20951e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith { return Visit(E->getChosenSubExpr(Ctx)); } 20968cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E) { return Visit(E->getSubExpr()); } 20978cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBinAssign(const BinaryOperator *E) { return true; } 20988cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundAssignOperator(const BinaryOperator *E) { return true; } 20998cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBinaryOperator(const BinaryOperator *E) 2100980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump { return Visit(E->getLHS()) || Visit(E->getRHS()); } 21018cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPreInc(const UnaryOperator *E) { return true; } 21028cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPostInc(const UnaryOperator *E) { return true; } 21038cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPreDec(const UnaryOperator *E) { return true; } 21048cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPostDec(const UnaryOperator *E) { return true; } 21058cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryDeref(const UnaryOperator *E) { 21061e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2107c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 2108980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump return Visit(E->getSubExpr()); 2109c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 21108cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryOperator(const UnaryOperator *E) { return Visit(E->getSubExpr()); } 2111363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner 2112363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner // Has side effects if any element does. 21138cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitInitListExpr(const InitListExpr *E) { 2114363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner for (unsigned i = 0, e = E->getNumInits(); i != e; ++i) 2115363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner if (Visit(E->getInit(i))) return true; 21168cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (const Expr *filler = E->getArrayFiller()) 21174423ac0282acb8ba801eb05b38712438dc0c1e3eArgyrios Kyrtzidis return Visit(filler); 2118363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner return false; 2119363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner } 2120ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor 21218cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitSizeOfPackExpr(const SizeOfPackExpr *) { return false; } 2122c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump}; 2123c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 212456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCallclass OpaqueValueEvaluation { 212556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall EvalInfo &info; 212656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall OpaqueValueExpr *opaqueValue; 212756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 212856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCallpublic: 212956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall OpaqueValueEvaluation(EvalInfo &info, OpaqueValueExpr *opaqueValue, 213056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall Expr *value) 213156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall : info(info), opaqueValue(opaqueValue) { 213256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 213356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall // If evaluation fails, fail immediately. 21341e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!Evaluate(info.OpaqueValues[opaqueValue], info, value)) { 213556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall this->opaqueValue = 0; 213656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall return; 213756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 213856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 213956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 214056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall bool hasError() const { return opaqueValue == 0; } 214156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 214256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ~OpaqueValueEvaluation() { 21431e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith // FIXME: This will not work for recursive constexpr functions using opaque 21441e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith // values. Restore the former value. 214556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (opaqueValue) info.OpaqueValues.erase(opaqueValue); 214656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 214756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall}; 214856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 2149c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump} // end anonymous namespace 2150c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 21514efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 21528cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne// Generic Evaluation 21538cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne//===----------------------------------------------------------------------===// 21548cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournenamespace { 21558cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2156f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith// FIXME: RetTy is always bool. Remove it. 2157f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithtemplate <class Derived, typename RetTy=bool> 21588cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneclass ExprEvaluatorBase 21598cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ConstStmtVisitor<Derived, RetTy> { 21608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneprivate: 216147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith RetTy DerivedSuccess(const CCValue &V, const Expr *E) { 21628cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return static_cast<Derived*>(this)->Success(V, E); 21638cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 216451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RetTy DerivedZeroInitialization(const Expr *E) { 216551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return static_cast<Derived*>(this)->ZeroInitialization(E); 2166f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 21678cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 21688cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneprotected: 21698cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne EvalInfo &Info; 21708cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne typedef ConstStmtVisitor<Derived, RetTy> StmtVisitorTy; 21718cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne typedef ExprEvaluatorBase ExprEvaluatorBaseTy; 21728cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2173dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith OptionalDiagnostic CCEDiag(const Expr *E, diag::kind D) { 2174d5093420308784e31071c8cd723a58d74159f393Richard Smith return Info.CCEDiag(E->getExprLoc(), D); 2175f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2176f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 2177f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// Report an evaluation error. This should only be called when an error is 2178f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// first discovered. When propagating an error, just return false. 2179f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool Error(const Expr *E, diag::kind D) { 2180dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), D); 2181f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2182f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2183f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool Error(const Expr *E) { 2184f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_invalid_subexpr_in_const_expr); 2185f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2186f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 218751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RetTy ZeroInitialization(const Expr *E) { return Error(E); } 2188f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 21898cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournepublic: 21908cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne ExprEvaluatorBase(EvalInfo &Info) : Info(Info) {} 21918cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 21928cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitStmt(const Stmt *) { 2193b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Expression evaluator should not be called on stmts"); 21948cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 21958cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitExpr(const Expr *E) { 2196f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 21978cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 21988cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 21998cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitParenExpr(const ParenExpr *E) 22008cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 22018cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitUnaryExtension(const UnaryOperator *E) 22028cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 22038cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitUnaryPlus(const UnaryOperator *E) 22048cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 22058cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitChooseExpr(const ChooseExpr *E) 22068cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getChosenSubExpr(Info.Ctx)); } 22078cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitGenericSelectionExpr(const GenericSelectionExpr *E) 22088cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getResultExpr()); } 220991a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall RetTy VisitSubstNonTypeTemplateParmExpr(const SubstNonTypeTemplateParmExpr *E) 221091a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall { return StmtVisitorTy::Visit(E->getReplacement()); } 22113d75ca836205856077c18e30e9447accbd85f751Richard Smith RetTy VisitCXXDefaultArgExpr(const CXXDefaultArgExpr *E) 22123d75ca836205856077c18e30e9447accbd85f751Richard Smith { return StmtVisitorTy::Visit(E->getExpr()); } 2213bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith // We cannot create any objects for which cleanups are required, so there is 2214bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith // nothing to do here; all cleanups must come from unevaluated subexpressions. 2215bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith RetTy VisitExprWithCleanups(const ExprWithCleanups *E) 2216bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith { return StmtVisitorTy::Visit(E->getSubExpr()); } 22178cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2218c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith RetTy VisitCXXReinterpretCastExpr(const CXXReinterpretCastExpr *E) { 2219c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 0; 2220c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith return static_cast<Derived*>(this)->VisitCastExpr(E); 2221c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith } 2222c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith RetTy VisitCXXDynamicCastExpr(const CXXDynamicCastExpr *E) { 2223c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 1; 2224c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith return static_cast<Derived*>(this)->VisitCastExpr(E); 2225c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith } 2226c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 2227e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RetTy VisitBinaryOperator(const BinaryOperator *E) { 2228e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getOpcode()) { 2229e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2230f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2231e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2232e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_Comma: 2233e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith VisitIgnoredValue(E->getLHS()); 2234e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return StmtVisitorTy::Visit(E->getRHS()); 2235e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2236e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemD: 2237e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemI: { 2238e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue Obj; 2239e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!HandleMemberPointerAccess(Info, E, Obj)) 2240e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2241e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith CCValue Result; 2242f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), Obj, Result)) 2243e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2244e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DerivedSuccess(Result, E); 2245e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2246e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2247e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2248e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 22498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitBinaryConditionalOperator(const BinaryConditionalOperator *E) { 22508cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne OpaqueValueEvaluation opaque(Info, E->getOpaqueValue(), E->getCommon()); 22518cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (opaque.hasError()) 2252f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 22538cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 22548cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool cond; 2255c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateAsBooleanCondition(E->getCond(), cond, Info)) 2256f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 22578cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 22588cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return StmtVisitorTy::Visit(cond ? E->getTrueExpr() : E->getFalseExpr()); 22598cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 22608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 22618cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitConditionalOperator(const ConditionalOperator *E) { 22628cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool BoolResult; 2263c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateAsBooleanCondition(E->getCond(), BoolResult, Info)) 2264f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 22658cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2266c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Expr *EvalExpr = BoolResult ? E->getTrueExpr() : E->getFalseExpr(); 22678cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return StmtVisitorTy::Visit(EvalExpr); 22688cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 22698cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 22708cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitOpaqueValueExpr(const OpaqueValueExpr *E) { 227147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith const CCValue *Value = Info.getOpaqueValue(E); 227242786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (!Value) { 227342786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis const Expr *Source = E->getSourceExpr(); 227442786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (!Source) 2275f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 227642786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (Source == E) { // sanity checking. 227742786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis assert(0 && "OpaqueValueExpr recursively refers to itself"); 2278f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 227942786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis } 228042786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis return StmtVisitorTy::Visit(Source); 228142786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis } 228247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return DerivedSuccess(*Value, E); 22838cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 2284f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 2285d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith RetTy VisitCallExpr(const CallExpr *E) { 2286e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const Expr *Callee = E->getCallee()->IgnoreParens(); 2287d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith QualType CalleeType = Callee->getType(); 2288d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 22896142ca7790aa09a6e13592b70f142cc4bbcadcaeDevang Patel const FunctionDecl *FD = 0; 229059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith LValue *This = 0, ThisVal; 229159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 229259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 229359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Extract function decl and 'this' pointer from the callee. 229459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (CalleeType->isSpecificBuiltinType(BuiltinType::BoundMember)) { 2295f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const ValueDecl *Member = 0; 2296e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const MemberExpr *ME = dyn_cast<MemberExpr>(Callee)) { 2297e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Explicit bound member calls, such as x.f() or p->g(); 2298e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateObjectArgument(Info, ME->getBase(), ThisVal)) 2299f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2300f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Member = ME->getMemberDecl(); 2301e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith This = &ThisVal; 2302e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else if (const BinaryOperator *BE = dyn_cast<BinaryOperator>(Callee)) { 2303e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Indirect bound member calls ('.*' or '->*'). 2304f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Member = HandleMemberPointerAccess(Info, BE, ThisVal, false); 2305f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Member) return false; 2306e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith This = &ThisVal; 2307e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else 2308f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 2309f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 2310f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith FD = dyn_cast<FunctionDecl>(Member); 2311f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!FD) 2312f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 231359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } else if (CalleeType->isFunctionPointerType()) { 2314b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LValue Call; 2315b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!EvaluatePointer(Callee, Call, Info)) 2316f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 231759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2318b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Call.getLValueOffset().isZero()) 2319f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 23201bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith FD = dyn_cast_or_null<FunctionDecl>( 23211bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Call.getLValueBase().dyn_cast<const ValueDecl*>()); 232259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!FD) 2323f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 232459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 232559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Overloaded operator calls to member functions are represented as normal 232659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // calls with '*this' as the first argument. 232759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 232859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (MD && !MD->isStatic()) { 2329f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: When selecting an implicit conversion for an overloaded 2330f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // operator delete, we sometimes try to evaluate calls to conversion 2331f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // operators without a 'this' parameter! 2332f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Args.empty()) 2333f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2334f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 233559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!EvaluateObjectArgument(Info, Args[0], ThisVal)) 233659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return false; 233759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith This = &ThisVal; 233859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Args = Args.slice(1); 233959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 2340d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 234159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Don't call function pointers which have been cast to some other type. 234259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!Info.Ctx.hasSameType(CalleeType->getPointeeType(), FD->getType())) 2343f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 234459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } else 2345f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2346d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2347c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Definition = 0; 2348d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith Stmt *Body = FD->getBody(Definition); 234969c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith APValue Result; 2350d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2351c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition) || 2352745f5147e065900267c85a5568785a1991d4838fRichard Smith !HandleFunctionCall(E->getExprLoc(), Definition, This, Args, Body, 2353745f5147e065900267c85a5568785a1991d4838fRichard Smith Info, Result)) 2354f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2355d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2356b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return DerivedSuccess(CCValue(Info.Ctx, Result, CCValue::GlobalValue()), E); 2357d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2358d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2359c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RetTy VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { 2360c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return StmtVisitorTy::Visit(E->getInitializer()); 2361c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2362f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitInitListExpr(const InitListExpr *E) { 236371523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman if (E->getNumInits() == 0) 236471523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman return DerivedZeroInitialization(E); 236571523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman if (E->getNumInits() == 1) 236671523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman return StmtVisitorTy::Visit(E->getInit(0)); 2367f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2368f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2369f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) { 237051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2371f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2372f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) { 237351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2374f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2375e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RetTy VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) { 237651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2377e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2378f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 2379180f47959a066795cc0f409433023af448bb0328Richard Smith /// A member expression where the object is a prvalue is itself a prvalue. 2380180f47959a066795cc0f409433023af448bb0328Richard Smith RetTy VisitMemberExpr(const MemberExpr *E) { 2381180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!E->isArrow() && "missing call to bound member function?"); 2382180f47959a066795cc0f409433023af448bb0328Richard Smith 2383180f47959a066795cc0f409433023af448bb0328Richard Smith CCValue Val; 2384180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Evaluate(Val, Info, E->getBase())) 2385180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2386180f47959a066795cc0f409433023af448bb0328Richard Smith 2387180f47959a066795cc0f409433023af448bb0328Richard Smith QualType BaseTy = E->getBase()->getType(); 2388180f47959a066795cc0f409433023af448bb0328Richard Smith 2389180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl()); 2390f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!FD) return Error(E); 2391180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!FD->getType()->isReferenceType() && "prvalue reference?"); 2392180f47959a066795cc0f409433023af448bb0328Richard Smith assert(BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() == 2393180f47959a066795cc0f409433023af448bb0328Richard Smith FD->getParent()->getCanonicalDecl() && "record / field mismatch"); 2394180f47959a066795cc0f409433023af448bb0328Richard Smith 2395b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator Designator(BaseTy); 2396b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addDeclUnchecked(FD); 2397180f47959a066795cc0f409433023af448bb0328Richard Smith 2398f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, E, Val, BaseTy, Designator, E->getType()) && 2399180f47959a066795cc0f409433023af448bb0328Richard Smith DerivedSuccess(Val, E); 2400180f47959a066795cc0f409433023af448bb0328Richard Smith } 2401180f47959a066795cc0f409433023af448bb0328Richard Smith 2402c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RetTy VisitCastExpr(const CastExpr *E) { 2403c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith switch (E->getCastKind()) { 2404c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith default: 2405c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith break; 2406c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 24077a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 24087a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 2409c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case CK_NoOp: 24107d580a4e9e47dffc3c17aa2b957ac57ca3c4e451Richard Smith case CK_UserDefinedConversion: 2411c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return StmtVisitorTy::Visit(E->getSubExpr()); 2412c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2413c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case CK_LValueToRValue: { 2414c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LValue LVal; 2415f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateLValue(E->getSubExpr(), LVal, Info)) 2416f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2417f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith CCValue RVal; 2418f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), LVal, RVal)) 2419f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2420f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return DerivedSuccess(RVal, E); 2421c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2422c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2423c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2424f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2425c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2426c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 24278327fad71da34492d82c532f42a58cb4baff81a3Richard Smith /// Visit a value which is evaluated, but whose value is ignored. 24288327fad71da34492d82c532f42a58cb4baff81a3Richard Smith void VisitIgnoredValue(const Expr *E) { 242947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue Scratch; 24308327fad71da34492d82c532f42a58cb4baff81a3Richard Smith if (!Evaluate(Scratch, Info, E)) 24318327fad71da34492d82c532f42a58cb4baff81a3Richard Smith Info.EvalStatus.HasSideEffects = true; 24328327fad71da34492d82c532f42a58cb4baff81a3Richard Smith } 24338cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne}; 24348cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 24358cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne} 24368cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 24378cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne//===----------------------------------------------------------------------===// 2438e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Common base class for lvalue and temporary evaluation. 2439e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 2440e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 2441e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithtemplate<class Derived> 2442e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass LValueExprEvaluatorBase 2443e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public ExprEvaluatorBase<Derived, bool> { 2444e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithprotected: 2445e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &Result; 2446e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef LValueExprEvaluatorBase LValueExprEvaluatorBaseTy; 2447e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef ExprEvaluatorBase<Derived, bool> ExprEvaluatorBaseTy; 2448e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2449e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(APValue::LValueBase B) { 2450e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.set(B); 2451e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2452e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2453e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2454e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 2455e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBase(EvalInfo &Info, LValue &Result) : 2456e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ExprEvaluatorBaseTy(Info), Result(Result) {} 2457e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2458e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(const CCValue &V, const Expr *E) { 2459e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.setFrom(V); 2460e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2461e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2462e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2463e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitMemberExpr(const MemberExpr *E) { 2464e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Handle non-static data members. 2465e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType BaseTy; 2466e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isArrow()) { 2467e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluatePointer(E->getBase(), Result, this->Info)) 2468e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2469e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith BaseTy = E->getBase()->getType()->getAs<PointerType>()->getPointeeType(); 2470c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else if (E->getBase()->isRValue()) { 2471af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith assert(E->getBase()->getType()->isRecordType()); 2472c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!EvaluateTemporary(E->getBase(), Result, this->Info)) 2473c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 2474c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith BaseTy = E->getBase()->getType(); 2475e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else { 2476e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!this->Visit(E->getBase())) 2477e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2478e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith BaseTy = E->getBase()->getType(); 2479e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2480e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2481d9b02e726262e4009dda830998bb934172ac0020Richard Smith const ValueDecl *MD = E->getMemberDecl(); 2482d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl())) { 2483d9b02e726262e4009dda830998bb934172ac0020Richard Smith assert(BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() == 2484d9b02e726262e4009dda830998bb934172ac0020Richard Smith FD->getParent()->getCanonicalDecl() && "record / field mismatch"); 2485d9b02e726262e4009dda830998bb934172ac0020Richard Smith (void)BaseTy; 2486d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueMember(this->Info, E, Result, FD); 2487d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else if (const IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(MD)) { 2488d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueIndirectMember(this->Info, E, Result, IFD); 2489d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else 2490d9b02e726262e4009dda830998bb934172ac0020Richard Smith return this->Error(E); 2491e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2492d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (MD->getType()->isReferenceType()) { 2493e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith CCValue RefValue; 2494d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (!HandleLValueToRValueConversion(this->Info, E, MD->getType(), Result, 2495e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RefValue)) 2496e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2497e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success(RefValue, E); 2498e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2499e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2500e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2501e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2502e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitBinaryOperator(const BinaryOperator *E) { 2503e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getOpcode()) { 2504e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2505e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 2506e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2507e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemD: 2508e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemI: 2509e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleMemberPointerAccess(this->Info, E, Result); 2510e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2511e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2512e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2513e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E) { 2514e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 2515e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2516e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 2517e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2518e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_DerivedToBase: 2519e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_UncheckedDerivedToBase: { 2520e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!this->Visit(E->getSubExpr())) 2521e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2522e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2523e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Now figure out the necessary offset to add to the base LV to get from 2524e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // the derived class to the base class. 2525e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType Type = E->getSubExpr()->getType(); 2526e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2527e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 2528e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 2529b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleLValueBase(this->Info, E, Result, Type->getAsCXXRecordDecl(), 2530e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith *PathI)) 2531e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2532e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Type = (*PathI)->getType(); 2533e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2534e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2535e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2536e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2537e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2538e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2539e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 2540e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 2541e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2542e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 25434efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman// LValue Evaluation 2544c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 2545c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// This is used for evaluating lvalues (in C and C++), xvalues (in C++11), 2546c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// function designators (in C), decl references to void objects (in C), and 2547c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// temporaries (if building with -Wno-address-of-temporary). 2548c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 2549c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// LValue evaluation produces values comprising a base expression of one of the 2550c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// following types: 25511bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Declarations 25521bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * VarDecl 25531bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * FunctionDecl 25541bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Literals 2555c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * CompoundLiteralExpr in C 2556c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * StringLiteral 255747d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith// * CXXTypeidExpr 2558c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * PredefinedExpr 2559180f47959a066795cc0f409433023af448bb0328Richard Smith// * ObjCStringLiteralExpr 2560c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * ObjCEncodeExpr 2561c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * AddrLabelExpr 2562c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * BlockExpr 2563c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * CallExpr for a MakeStringConstant builtin 25641bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Locals and temporaries 25651bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * Any Expr, with a Frame indicating the function in which the temporary was 25661bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// evaluated. 25671bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// plus an offset in bytes. 25684efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 25694efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedmannamespace { 2570770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass LValueExprEvaluator 2571e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public LValueExprEvaluatorBase<LValueExprEvaluator> { 25724efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedmanpublic: 2573e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluator(EvalInfo &Info, LValue &Result) : 2574e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBaseTy(Info, Result) {} 25751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2576c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith bool VisitVarDecl(const Expr *E, const VarDecl *VD); 2577c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 25788cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitDeclRefExpr(const DeclRefExpr *E); 25798cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitPredefinedExpr(const PredefinedExpr *E) { return Success(E); } 2580bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith bool VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E); 25818cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E); 25828cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitMemberExpr(const MemberExpr *E); 25838cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStringLiteral(const StringLiteral *E) { return Success(E); } 25848cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitObjCEncodeExpr(const ObjCEncodeExpr *E) { return Success(E); } 258547d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith bool VisitCXXTypeidExpr(const CXXTypeidExpr *E); 25868cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E); 25878cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryDeref(const UnaryOperator *E); 25888cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 25898cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E) { 259026bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson switch (E->getCastKind()) { 259126bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson default: 2592e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitCastExpr(E); 259326bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson 2594db924224b51b153f24fbe492102d4edebcbbb7f4Eli Friedman case CK_LValueBitCast: 2595c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith this->CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 25960a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (!Visit(E->getSubExpr())) 25970a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 25980a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Result.Designator.setInvalid(); 25990a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 2600db924224b51b153f24fbe492102d4edebcbbb7f4Eli Friedman 2601e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerived: 2602180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Visit(E->getSubExpr())) 2603180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2604e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleBaseToDerivedCast(Info, E, Result); 260526bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson } 260626bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson } 2607cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 2608ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman // FIXME: Missing: __real__, __imag__ 26098cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 26104efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman}; 26114efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} // end anonymous namespace 26124efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 2613c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// Evaluate an expression as an lvalue. This can be legitimately called on 2614c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// expressions which are not glvalues, in a few cases: 2615c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * function designators in C, 2616c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * "extern void" objects, 2617c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * temporaries, if building with -Wno-address-of-temporary. 2618efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluateLValue(const Expr* E, LValue& Result, EvalInfo &Info) { 2619c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert((E->isGLValue() || E->getType()->isFunctionType() || 2620c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith E->getType()->isVoidType() || isa<CXXTemporaryObjectExpr>(E)) && 2621c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith "can't evaluate expression as an lvalue"); 26228cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return LValueExprEvaluator(Info, Result).Visit(E); 26234efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 26244efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 26258cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitDeclRefExpr(const DeclRefExpr *E) { 26261bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(E->getDecl())) 26271bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(FD); 26281bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(E->getDecl())) 2629c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return VisitVarDecl(E, VD); 2630c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Error(E); 2631c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 2632436c8898cd1c93c5bacd3fcc4ac586bc5cd77062Richard Smith 2633c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithbool LValueExprEvaluator::VisitVarDecl(const Expr *E, const VarDecl *VD) { 2634177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (!VD->getType()->isReferenceType()) { 2635177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (isa<ParmVarDecl>(VD)) { 26361bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.set(VD, Info.CurrentCall); 2637177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return true; 2638177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith } 26391bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(VD); 2640177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith } 264150c39ea4858265f3f5f42a0c624557ce2281936bEli Friedman 264247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue V; 2643f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateVarDeclInit(Info, E, VD, Info.CurrentCall, V)) 2644f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2645f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(V, E); 264635873c49adad211ff466e34342a52665742794f5Anders Carlsson} 264735873c49adad211ff466e34342a52665742794f5Anders Carlsson 2648bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smithbool LValueExprEvaluator::VisitMaterializeTemporaryExpr( 2649bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith const MaterializeTemporaryExpr *E) { 2650e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->GetTemporaryExpr()->isRValue()) { 2651af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith if (E->getType()->isRecordType()) 2652e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateTemporary(E->GetTemporaryExpr(), Result, Info); 2653e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2654e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.set(E, Info.CurrentCall); 2655e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateConstantExpression(Info.CurrentCall->Temporaries[E], Info, 2656e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result, E->GetTemporaryExpr()); 2657e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2658e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2659e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Materialization of an lvalue temporary occurs when we need to force a copy 2660e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // (for instance, if it's a bitfield). 2661e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // FIXME: The AST should contain an lvalue-to-rvalue node for such cases. 2662e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->GetTemporaryExpr())) 2663e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2664f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), Result, 2665e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Info.CurrentCall->Temporaries[E])) 2666e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 26671bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.set(E, Info.CurrentCall); 2668e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2669bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith} 2670bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 26718cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool 26728cad3046be06ea73ff8892d947697a21d7a440d3Peter CollingbourneLValueExprEvaluator::VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { 2673c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(!Info.getLangOpts().CPlusPlus && "lvalue compound literal in c++?"); 2674c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // Defer visiting the literal until the lvalue-to-rvalue conversion. We can 2675c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // only see this when folding in C, so there's no standard to follow here. 2676efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 26774efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 26784efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 267947d2145675099893d702be4bc06bd9f26d8ddd13Richard Smithbool LValueExprEvaluator::VisitCXXTypeidExpr(const CXXTypeidExpr *E) { 268047d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith if (E->isTypeOperand()) 268147d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return Success(E); 268247d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith CXXRecordDecl *RD = E->getExprOperand()->getType()->getAsCXXRecordDecl(); 268347d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith if (RD && RD->isPolymorphic()) { 268447d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_typeid_polymorphic) 268547d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith << E->getExprOperand()->getType() 268647d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith << E->getExprOperand()->getSourceRange(); 268747d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return false; 268847d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith } 268947d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return Success(E); 269047d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith} 269147d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith 26928cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitMemberExpr(const MemberExpr *E) { 2693c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // Handle static data members. 2694c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(E->getMemberDecl())) { 2695c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith VisitIgnoredValue(E->getBase()); 2696c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return VisitVarDecl(E, VD); 2697c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2698c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2699d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // Handle static member functions. 2700d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(E->getMemberDecl())) { 2701d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (MD->isStatic()) { 2702d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith VisitIgnoredValue(E->getBase()); 27031bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(MD); 2704d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2705d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2706d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2707180f47959a066795cc0f409433023af448bb0328Richard Smith // Handle non-static data members. 2708e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitMemberExpr(E); 27094efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 27104efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 27118cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitArraySubscriptExpr(const ArraySubscriptExpr *E) { 2712c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // FIXME: Deal with vectors as array subscript bases. 2713c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->getBase()->getType()->isVectorType()) 2714f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2715c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 27163068d117951a8df54bae9db039b56201ab10962bAnders Carlsson if (!EvaluatePointer(E->getBase(), Result, Info)) 2717efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 27181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 27193068d117951a8df54bae9db039b56201ab10962bAnders Carlsson APSInt Index; 27203068d117951a8df54bae9db039b56201ab10962bAnders Carlsson if (!EvaluateInteger(E->getIdx(), Index, Info)) 2721efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 2722180f47959a066795cc0f409433023af448bb0328Richard Smith int64_t IndexValue 2723180f47959a066795cc0f409433023af448bb0328Richard Smith = Index.isSigned() ? Index.getSExtValue() 2724180f47959a066795cc0f409433023af448bb0328Richard Smith : static_cast<int64_t>(Index.getZExtValue()); 27253068d117951a8df54bae9db039b56201ab10962bAnders Carlsson 2726b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleLValueArrayAdjustment(Info, E, Result, E->getType(), IndexValue); 27273068d117951a8df54bae9db039b56201ab10962bAnders Carlsson} 27284efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 27298cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitUnaryDeref(const UnaryOperator *E) { 2730efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return EvaluatePointer(E->getSubExpr(), Result, Info); 2731e8761c8fe2ee6b628104a0885f49fd3c21c08a4fEli Friedman} 2732e8761c8fe2ee6b628104a0885f49fd3c21c08a4fEli Friedman 27334efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 2734f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner// Pointer Evaluation 2735f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 2736f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 2737c754aa62643e66ab967ca32ae8b0b3fc419bba25Anders Carlssonnamespace { 2738770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass PointerExprEvaluator 27398cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<PointerExprEvaluator, bool> { 2740efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue &Result; 2741efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 27428cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool Success(const Expr *E) { 27431bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.set(E); 2744efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 2745efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } 27462bad1687fe6f00e10767a691a33b070b151902b6Anders Carlssonpublic: 27471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2748efdb83e26f9a1fd2566afe54461216cd84814d42John McCall PointerExprEvaluator(EvalInfo &info, LValue &Result) 27498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(Result) {} 2750f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 275147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith bool Success(const CCValue &V, const Expr *E) { 27528cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result.setFrom(V); 27538cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 27542bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson } 275551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 2756f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith return Success((Expr*)0); 2757f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 27582bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 2759efdb83e26f9a1fd2566afe54461216cd84814d42John McCall bool VisitBinaryOperator(const BinaryOperator *E); 27608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr* E); 2761efdb83e26f9a1fd2566afe54461216cd84814d42John McCall bool VisitUnaryAddrOf(const UnaryOperator *E); 27628cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitObjCStringLiteral(const ObjCStringLiteral *E) 2763efdb83e26f9a1fd2566afe54461216cd84814d42John McCall { return Success(E); } 27648cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitAddrLabelExpr(const AddrLabelExpr *E) 2765efdb83e26f9a1fd2566afe54461216cd84814d42John McCall { return Success(E); } 27668cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCallExpr(const CallExpr *E); 27678cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBlockExpr(const BlockExpr *E) { 2768469a1eb996e1cb0be54f9b210f836afbddcbb2ccJohn McCall if (!E->getBlockDecl()->hasCaptures()) 2769efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 2770f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2771b83d287bc7f47d36fb0751a481e2ef9308b37252Mike Stump } 2772180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitCXXThisExpr(const CXXThisExpr *E) { 2773180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Info.CurrentCall->This) 2774f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2775180f47959a066795cc0f409433023af448bb0328Richard Smith Result = *Info.CurrentCall->This; 2776180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 2777180f47959a066795cc0f409433023af448bb0328Richard Smith } 277856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 2779ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman // FIXME: Missing: @protocol, @selector 27802bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson}; 2781f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} // end anonymous namespace 27822bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 2783efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluatePointer(const Expr* E, LValue& Result, EvalInfo &Info) { 2784c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->hasPointerRepresentation()); 27858cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return PointerExprEvaluator(Info, Result).Visit(E); 2786f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} 2787650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 2788efdb83e26f9a1fd2566afe54461216cd84814d42John McCallbool PointerExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 27892de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() != BO_Add && 27902de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall E->getOpcode() != BO_Sub) 2791e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 27921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2793650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson const Expr *PExp = E->getLHS(); 2794650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson const Expr *IExp = E->getRHS(); 2795650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson if (IExp->getType()->isPointerType()) 2796f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner std::swap(PExp, IExp); 27971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2798745f5147e065900267c85a5568785a1991d4838fRichard Smith bool EvalPtrOK = EvaluatePointer(PExp, Result, Info); 2799745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalPtrOK && !Info.keepEvaluatingAfterFailure()) 2800efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 28011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2802efdb83e26f9a1fd2566afe54461216cd84814d42John McCall llvm::APSInt Offset; 2803745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateInteger(IExp, Offset, Info) || !EvalPtrOK) 2804efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 2805efdb83e26f9a1fd2566afe54461216cd84814d42John McCall int64_t AdditionalOffset 2806efdb83e26f9a1fd2566afe54461216cd84814d42John McCall = Offset.isSigned() ? Offset.getSExtValue() 2807efdb83e26f9a1fd2566afe54461216cd84814d42John McCall : static_cast<int64_t>(Offset.getZExtValue()); 28080a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (E->getOpcode() == BO_Sub) 28090a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith AdditionalOffset = -AdditionalOffset; 2810650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 2811180f47959a066795cc0f409433023af448bb0328Richard Smith QualType Pointee = PExp->getType()->getAs<PointerType>()->getPointeeType(); 2812b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleLValueArrayAdjustment(Info, E, Result, Pointee, 2813b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith AdditionalOffset); 2814650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson} 28154efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 2816efdb83e26f9a1fd2566afe54461216cd84814d42John McCallbool PointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { 2817efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return EvaluateLValue(E->getSubExpr(), Result, Info); 28184efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 28191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 28208cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool PointerExprEvaluator::VisitCastExpr(const CastExpr* E) { 28218cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 2822650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 282309a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman switch (E->getCastKind()) { 282409a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman default: 282509a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman break; 282609a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman 28272de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_BitCast: 28281d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 28291d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 28302de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_AnyPointerToBlockPointerCast: 283128c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith if (!Visit(SubExpr)) 283228c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith return false; 2833c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // Bitcasts to cv void* are static_casts, not reinterpret_casts, so are 2834c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // permitted in constant expressions in C++11. Bitcasts from cv void* are 2835c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // also static_casts, but we disallow them as a resolution to DR1312. 28364cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith if (!E->getType()->isVoidPointerType()) { 283728c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith Result.Designator.setInvalid(); 28384cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith if (SubExpr->getType()->isVoidPointerType()) 28394cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) 28404cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith << 3 << SubExpr->getType(); 28414cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith else 28424cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 28434cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith } 28440a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 284509a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman 28465c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson case CK_DerivedToBase: 28475c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson case CK_UncheckedDerivedToBase: { 284847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith if (!EvaluatePointer(E->getSubExpr(), Result, Info)) 28495c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return false; 2850e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.Base && Result.Offset.isZero()) 2851e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 28525c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 2853180f47959a066795cc0f409433023af448bb0328Richard Smith // Now figure out the necessary offset to add to the base LV to get from 28545c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson // the derived class to the base class. 2855180f47959a066795cc0f409433023af448bb0328Richard Smith QualType Type = 2856180f47959a066795cc0f409433023af448bb0328Richard Smith E->getSubExpr()->getType()->castAs<PointerType>()->getPointeeType(); 28575c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 2858180f47959a066795cc0f409433023af448bb0328Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 28595c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson PathE = E->path_end(); PathI != PathE; ++PathI) { 2860b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleLValueBase(Info, E, Result, Type->getAsCXXRecordDecl(), 2861b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith *PathI)) 28625c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return false; 2863180f47959a066795cc0f409433023af448bb0328Richard Smith Type = (*PathI)->getType(); 28645c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson } 28655c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 28665c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return true; 28675c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson } 28685c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 2869e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerived: 2870e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 2871e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2872e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.Base && Result.Offset.isZero()) 2873e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2874e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleBaseToDerivedCast(Info, E, Result); 2875e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 287647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith case CK_NullToPointer: 287751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 2878404cd1669c3ba138a9ae0a619bd689cce5aae271John McCall 28792de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_IntegralToPointer: { 2880c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 2881c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 288247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue Value; 2883efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateIntegerOrLValue(SubExpr, Value, Info)) 288409a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman break; 288569ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar 2886efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (Value.isInt()) { 288747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith unsigned Size = Info.Ctx.getTypeSize(E->getType()); 288847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith uint64_t N = Value.getInt().extOrTrunc(Size).getZExtValue(); 28891bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.Base = (Expr*)0; 289047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result.Offset = CharUnits::fromQuantity(N); 2891177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith Result.Frame = 0; 28920a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Result.Designator.setInvalid(); 2893efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 2894efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else { 2895efdb83e26f9a1fd2566afe54461216cd84814d42John McCall // Cast is of an lvalue, no need to change value. 289647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result.setFrom(Value); 2897efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 2898650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson } 2899650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson } 29002de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_ArrayToPointerDecay: 2901e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (SubExpr->isGLValue()) { 2902e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateLValue(SubExpr, Result, Info)) 2903e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2904e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else { 2905e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.set(SubExpr, Info.CurrentCall); 2906e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateConstantExpression(Info.CurrentCall->Temporaries[SubExpr], 2907e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Info, Result, SubExpr)) 2908e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2909e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 29100a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith // The result is a pointer to the first element of the array. 2911b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (const ConstantArrayType *CAT 2912b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith = Info.Ctx.getAsConstantArrayType(SubExpr->getType())) 2913b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result.addArray(Info, E, CAT); 2914b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 2915b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result.Designator.setInvalid(); 29160a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 29176a7c94af983717e2c2d6aebe42cb4737c1c7b9e6Richard Smith 29182de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_FunctionToPointerDecay: 29196a7c94af983717e2c2d6aebe42cb4737c1c7b9e6Richard Smith return EvaluateLValue(SubExpr, Result, Info); 29204efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 29214efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 2922c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 29231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump} 2924650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 29258cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool PointerExprEvaluator::VisitCallExpr(const CallExpr *E) { 2926180f47959a066795cc0f409433023af448bb0328Richard Smith if (IsStringLiteralCall(E)) 2927efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 292856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 29298cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 29304efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 2931f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 2932f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 2933e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Member Pointer Evaluation 2934e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 2935e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2936e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 2937e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass MemberPointerExprEvaluator 2938e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public ExprEvaluatorBase<MemberPointerExprEvaluator, bool> { 2939e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr &Result; 2940e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2941e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(const ValueDecl *D) { 2942e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = MemberPtr(D); 2943e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2944e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2945e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 2946e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2947e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPointerExprEvaluator(EvalInfo &Info, MemberPtr &Result) 2948e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : ExprEvaluatorBaseTy(Info), Result(Result) {} 2949e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2950e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(const CCValue &V, const Expr *E) { 2951e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.setFrom(V); 2952e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2953e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 295451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 2955e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success((const ValueDecl*)0); 2956e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2957e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2958e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E); 2959e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitUnaryAddrOf(const UnaryOperator *E); 2960e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 2961e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} // end anonymous namespace 2962e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2963e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, 2964e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith EvalInfo &Info) { 2965e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(E->isRValue() && E->getType()->isMemberPointerType()); 2966e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return MemberPointerExprEvaluator(Info, Result).Visit(E); 2967e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 2968e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2969e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool MemberPointerExprEvaluator::VisitCastExpr(const CastExpr *E) { 2970e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 2971e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2972e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 2973e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2974e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_NullToMemberPointer: 297551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 2976e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2977e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerivedMemberPointer: { 2978e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 2979e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2980e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->path_empty()) 2981e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2982e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Base-to-derived member pointer casts store the path in derived-to-base 2983e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // order, so iterate backwards. The CXXBaseSpecifier also provides us with 2984e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // the wrong end of the derived->base arc, so stagger the path by one class. 2985e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef std::reverse_iterator<CastExpr::path_const_iterator> ReverseIter; 2986e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (ReverseIter PathI(E->path_end() - 1), PathE(E->path_begin()); 2987e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathI != PathE; ++PathI) { 2988e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!(*PathI)->isVirtual() && "memptr cast through vbase"); 2989e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Derived = (*PathI)->getType()->getAsCXXRecordDecl(); 2990e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToDerived(Derived)) 2991f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2992e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2993e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const Type *FinalTy = E->getType()->castAs<MemberPointerType>()->getClass(); 2994e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToDerived(FinalTy->getAsCXXRecordDecl())) 2995f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2996e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2997e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2998e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2999e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_DerivedToBaseMemberPointer: 3000e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3001e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3002e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 3003e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 3004e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!(*PathI)->isVirtual() && "memptr cast through vbase"); 3005e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); 3006e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToBase(Base)) 3007f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3008e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3009e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3010e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3011e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3012e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3013e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool MemberPointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { 3014e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.unary.op]p3 has very strict rules on how the address of a 3015e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // member can be formed. 3016e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success(cast<DeclRefExpr>(E->getSubExpr())->getDecl()); 3017e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3018e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3019e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3020180f47959a066795cc0f409433023af448bb0328Richard Smith// Record Evaluation 3021180f47959a066795cc0f409433023af448bb0328Richard Smith//===----------------------------------------------------------------------===// 3022180f47959a066795cc0f409433023af448bb0328Richard Smith 3023180f47959a066795cc0f409433023af448bb0328Richard Smithnamespace { 3024180f47959a066795cc0f409433023af448bb0328Richard Smith class RecordExprEvaluator 3025180f47959a066795cc0f409433023af448bb0328Richard Smith : public ExprEvaluatorBase<RecordExprEvaluator, bool> { 3026180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue &This; 3027180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result; 3028180f47959a066795cc0f409433023af448bb0328Richard Smith public: 3029180f47959a066795cc0f409433023af448bb0328Richard Smith 3030180f47959a066795cc0f409433023af448bb0328Richard Smith RecordExprEvaluator(EvalInfo &info, const LValue &This, APValue &Result) 3031180f47959a066795cc0f409433023af448bb0328Richard Smith : ExprEvaluatorBaseTy(info), This(This), Result(Result) {} 3032180f47959a066795cc0f409433023af448bb0328Richard Smith 3033180f47959a066795cc0f409433023af448bb0328Richard Smith bool Success(const CCValue &V, const Expr *E) { 3034f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return CheckConstantExpression(Info, E, V, Result); 3035180f47959a066795cc0f409433023af448bb0328Richard Smith } 303651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E); 3037180f47959a066795cc0f409433023af448bb0328Richard Smith 303859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith bool VisitCastExpr(const CastExpr *E); 3039180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitInitListExpr(const InitListExpr *E); 3040180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E); 3041180f47959a066795cc0f409433023af448bb0328Richard Smith }; 3042180f47959a066795cc0f409433023af448bb0328Richard Smith} 3043180f47959a066795cc0f409433023af448bb0328Richard Smith 304451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// Perform zero-initialization on an object of non-union class type. 304551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// C++11 [dcl.init]p5: 304651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// To zero-initialize an object or reference of type T means: 304751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// [...] 304851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// -- if T is a (possibly cv-qualified) non-union class type, 304951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// each non-static data member and each base-class subobject is 305051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// zero-initialized 3051b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleClassZeroInitialization(EvalInfo &Info, const Expr *E, 3052b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const RecordDecl *RD, 305351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const LValue &This, APValue &Result) { 305451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith assert(!RD->isUnion() && "Expected non-union class type"); 305551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD); 305651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue(APValue::UninitStruct(), CD ? CD->getNumBases() : 0, 305751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith std::distance(RD->field_begin(), RD->field_end())); 305851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 305951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 306051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 306151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CD) { 306251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith unsigned Index = 0; 306351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith for (CXXRecordDecl::base_class_const_iterator I = CD->bases_begin(), 3064b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith End = CD->bases_end(); I != End; ++I, ++Index) { 306551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 306651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3067b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, E, Subobject, CD, Base, &Layout); 3068b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleClassZeroInitialization(Info, E, Base, Subobject, 306951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result.getStructBase(Index))) 307051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 307151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 307251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 307351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3074b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith for (RecordDecl::field_iterator I = RD->field_begin(), End = RD->field_end(); 3075b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith I != End; ++I) { 307651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // -- if T is a reference type, no initialization is performed. 307751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if ((*I)->getType()->isReferenceType()) 307851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith continue; 307951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 308051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3081b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, E, Subobject, *I, &Layout); 308251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 308351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE((*I)->getType()); 308451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!EvaluateConstantExpression( 308551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result.getStructField((*I)->getFieldIndex()), Info, Subobject, &VIE)) 308651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 308751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 308851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 308951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 309051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 309151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 309251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smithbool RecordExprEvaluator::ZeroInitialization(const Expr *E) { 309351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl(); 309451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (RD->isUnion()) { 309551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // C++11 [dcl.init]p5: If T is a (possibly cv-qualified) union type, the 309651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // object's first non-static named data member is zero-initialized 309751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RecordDecl::field_iterator I = RD->field_begin(); 309851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (I == RD->field_end()) { 309951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue((const FieldDecl*)0); 310051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 310151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 310251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 310351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3104b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, E, Subobject, *I); 310551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue(*I); 310651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE((*I)->getType()); 310751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return EvaluateConstantExpression(Result.getUnionValue(), Info, 310851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Subobject, &VIE); 310951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 311051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3111b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleClassZeroInitialization(Info, E, RD, This, Result); 311251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 311351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 311459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithbool RecordExprEvaluator::VisitCastExpr(const CastExpr *E) { 311559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith switch (E->getCastKind()) { 311659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith default: 311759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 311859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 311959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_ConstructorConversion: 312059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return Visit(E->getSubExpr()); 312159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 312259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_DerivedToBase: 312359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_UncheckedDerivedToBase: { 312459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith CCValue DerivedObject; 3125f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Evaluate(DerivedObject, Info, E->getSubExpr())) 312659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return false; 3127f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!DerivedObject.isStruct()) 3128f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E->getSubExpr()); 312959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 313059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Derived-to-base rvalue conversion: just slice off the derived part. 313159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith APValue *Value = &DerivedObject; 313259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *RD = E->getSubExpr()->getType()->getAsCXXRecordDecl(); 313359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 313459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 313559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith assert(!(*PathI)->isVirtual() && "record rvalue with virtual base"); 313659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); 313759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Value = &Value->getStructBase(getBaseIndex(RD, Base)); 313859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith RD = Base; 313959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 314059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Result = *Value; 314159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return true; 314259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 314359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 314459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 314559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3146180f47959a066795cc0f409433023af448bb0328Richard Smithbool RecordExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 3147180f47959a066795cc0f409433023af448bb0328Richard Smith const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl(); 3148180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 3149180f47959a066795cc0f409433023af448bb0328Richard Smith 3150180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 3151ec789163a42a7be654ac34aadb750b508954d53cRichard Smith const FieldDecl *Field = E->getInitializedFieldInUnion(); 3152ec789163a42a7be654ac34aadb750b508954d53cRichard Smith Result = APValue(Field); 3153ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!Field) 3154180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 3155ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 3156ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // If the initializer list for a union does not contain any elements, the 3157ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // first element of the union is value-initialized. 3158ec789163a42a7be654ac34aadb750b508954d53cRichard Smith ImplicitValueInitExpr VIE(Field->getType()); 3159ec789163a42a7be654ac34aadb750b508954d53cRichard Smith const Expr *InitExpr = E->getNumInits() ? E->getInit(0) : &VIE; 3160ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 3161180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3162ec789163a42a7be654ac34aadb750b508954d53cRichard Smith HandleLValueMember(Info, InitExpr, Subobject, Field, &Layout); 3163180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateConstantExpression(Result.getUnionValue(), Info, 3164ec789163a42a7be654ac34aadb750b508954d53cRichard Smith Subobject, InitExpr); 3165180f47959a066795cc0f409433023af448bb0328Richard Smith } 3166180f47959a066795cc0f409433023af448bb0328Richard Smith 3167180f47959a066795cc0f409433023af448bb0328Richard Smith assert((!isa<CXXRecordDecl>(RD) || !cast<CXXRecordDecl>(RD)->getNumBases()) && 3168180f47959a066795cc0f409433023af448bb0328Richard Smith "initializer list for class with base classes"); 3169180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitStruct(), 0, 3170180f47959a066795cc0f409433023af448bb0328Richard Smith std::distance(RD->field_begin(), RD->field_end())); 3171180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned ElementNo = 0; 3172745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 3173180f47959a066795cc0f409433023af448bb0328Richard Smith for (RecordDecl::field_iterator Field = RD->field_begin(), 3174180f47959a066795cc0f409433023af448bb0328Richard Smith FieldEnd = RD->field_end(); Field != FieldEnd; ++Field) { 3175180f47959a066795cc0f409433023af448bb0328Richard Smith // Anonymous bit-fields are not considered members of the class for 3176180f47959a066795cc0f409433023af448bb0328Richard Smith // purposes of aggregate initialization. 3177180f47959a066795cc0f409433023af448bb0328Richard Smith if (Field->isUnnamedBitfield()) 3178180f47959a066795cc0f409433023af448bb0328Richard Smith continue; 3179180f47959a066795cc0f409433023af448bb0328Richard Smith 3180180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3181180f47959a066795cc0f409433023af448bb0328Richard Smith 3182745f5147e065900267c85a5568785a1991d4838fRichard Smith bool HaveInit = ElementNo < E->getNumInits(); 3183745f5147e065900267c85a5568785a1991d4838fRichard Smith 3184745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: Diagnostics here should point to the end of the initializer 3185745f5147e065900267c85a5568785a1991d4838fRichard Smith // list, not the start. 3186745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleLValueMember(Info, HaveInit ? E->getInit(ElementNo) : E, Subobject, 3187745f5147e065900267c85a5568785a1991d4838fRichard Smith *Field, &Layout); 3188745f5147e065900267c85a5568785a1991d4838fRichard Smith 3189745f5147e065900267c85a5568785a1991d4838fRichard Smith // Perform an implicit value-initialization for members beyond the end of 3190745f5147e065900267c85a5568785a1991d4838fRichard Smith // the initializer list. 3191745f5147e065900267c85a5568785a1991d4838fRichard Smith ImplicitValueInitExpr VIE(HaveInit ? Info.Ctx.IntTy : Field->getType()); 3192745f5147e065900267c85a5568785a1991d4838fRichard Smith 3193745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateConstantExpression( 3194745f5147e065900267c85a5568785a1991d4838fRichard Smith Result.getStructField((*Field)->getFieldIndex()), 3195745f5147e065900267c85a5568785a1991d4838fRichard Smith Info, Subobject, HaveInit ? E->getInit(ElementNo++) : &VIE)) { 3196745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 3197180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 3198745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 3199180f47959a066795cc0f409433023af448bb0328Richard Smith } 3200180f47959a066795cc0f409433023af448bb0328Richard Smith } 3201180f47959a066795cc0f409433023af448bb0328Richard Smith 3202745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 3203180f47959a066795cc0f409433023af448bb0328Richard Smith} 3204180f47959a066795cc0f409433023af448bb0328Richard Smith 3205180f47959a066795cc0f409433023af448bb0328Richard Smithbool RecordExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) { 3206180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXConstructorDecl *FD = E->getConstructor(); 320751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInit = E->requiresZeroInitialization(); 320851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) { 3209ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // If we've already performed zero-initialization, we're already done. 3210ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!Result.isUninit()) 3211ec789163a42a7be654ac34aadb750b508954d53cRichard Smith return true; 3212ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 321351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit) 321451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 321551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 32166180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith const CXXRecordDecl *RD = FD->getParent(); 32176180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (RD->isUnion()) 32186180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result = APValue((FieldDecl*)0); 32196180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith else 32206180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result = APValue(APValue::UninitStruct(), RD->getNumBases(), 32216180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith std::distance(RD->field_begin(), RD->field_end())); 32226180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 32236180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 32246180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 3225180f47959a066795cc0f409433023af448bb0328Richard Smith const FunctionDecl *Definition = 0; 3226180f47959a066795cc0f409433023af448bb0328Richard Smith FD->getBody(Definition); 3227180f47959a066795cc0f409433023af448bb0328Richard Smith 3228c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition)) 3229c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 3230180f47959a066795cc0f409433023af448bb0328Richard Smith 3231610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // Avoid materializing a temporary for an elidable copy/move constructor. 323251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (E->isElidable() && !ZeroInit) 3233180f47959a066795cc0f409433023af448bb0328Richard Smith if (const MaterializeTemporaryExpr *ME 3234180f47959a066795cc0f409433023af448bb0328Richard Smith = dyn_cast<MaterializeTemporaryExpr>(E->getArg(0))) 3235180f47959a066795cc0f409433023af448bb0328Richard Smith return Visit(ME->GetTemporaryExpr()); 3236180f47959a066795cc0f409433023af448bb0328Richard Smith 323751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit && !ZeroInitialization(E)) 323851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 323951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3240180f47959a066795cc0f409433023af448bb0328Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 3241745f5147e065900267c85a5568785a1991d4838fRichard Smith return HandleConstructorCall(E->getExprLoc(), This, Args, 3242f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith cast<CXXConstructorDecl>(Definition), Info, 3243f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Result); 3244180f47959a066795cc0f409433023af448bb0328Richard Smith} 3245180f47959a066795cc0f409433023af448bb0328Richard Smith 3246180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateRecord(const Expr *E, const LValue &This, 3247180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result, EvalInfo &Info) { 3248180f47959a066795cc0f409433023af448bb0328Richard Smith assert(E->isRValue() && E->getType()->isRecordType() && 3249180f47959a066795cc0f409433023af448bb0328Richard Smith "can't evaluate expression as a record rvalue"); 3250180f47959a066795cc0f409433023af448bb0328Richard Smith return RecordExprEvaluator(Info, This, Result).Visit(E); 3251180f47959a066795cc0f409433023af448bb0328Richard Smith} 3252180f47959a066795cc0f409433023af448bb0328Richard Smith 3253180f47959a066795cc0f409433023af448bb0328Richard Smith//===----------------------------------------------------------------------===// 3254e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Temporary Evaluation 3255e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// 3256e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Temporaries are represented in the AST as rvalues, but generally behave like 3257e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// lvalues. The full-object of which the temporary is a subobject is implicitly 3258e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// materialized so that a reference can bind to it. 3259e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3260e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 3261e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass TemporaryExprEvaluator 3262e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public LValueExprEvaluatorBase<TemporaryExprEvaluator> { 3263e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 3264e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith TemporaryExprEvaluator(EvalInfo &Info, LValue &Result) : 3265e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBaseTy(Info, Result) {} 3266e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3267e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Visit an expression which constructs the value of this temporary. 3268e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitConstructExpr(const Expr *E) { 3269e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.set(E, Info.CurrentCall); 3270e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateConstantExpression(Info.CurrentCall->Temporaries[E], Info, 3271e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result, E); 3272e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3273e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3274e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E) { 3275e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 3276e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 3277e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitCastExpr(E); 3278e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3279e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_ConstructorConversion: 3280e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E->getSubExpr()); 3281e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3282e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3283e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitInitListExpr(const InitListExpr *E) { 3284e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3285e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3286e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E) { 3287e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3288e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3289e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCallExpr(const CallExpr *E) { 3290e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3291e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3292e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 3293e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} // end anonymous namespace 3294e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3295e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// Evaluate an expression of record type as a temporary. 3296e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info) { 3297af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith assert(E->isRValue() && E->getType()->isRecordType()); 3298e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return TemporaryExprEvaluator(Info, Result).Visit(E); 3299e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3300e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3301e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 330259b5da6d853b4368b984700315adf7b37de05764Nate Begeman// Vector Evaluation 330359b5da6d853b4368b984700315adf7b37de05764Nate Begeman//===----------------------------------------------------------------------===// 330459b5da6d853b4368b984700315adf7b37de05764Nate Begeman 330559b5da6d853b4368b984700315adf7b37de05764Nate Begemannamespace { 3306770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramer class VectorExprEvaluator 330707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith : public ExprEvaluatorBase<VectorExprEvaluator, bool> { 330807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith APValue &Result; 330959b5da6d853b4368b984700315adf7b37de05764Nate Begeman public: 33101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 331107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith VectorExprEvaluator(EvalInfo &info, APValue &Result) 331207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith : ExprEvaluatorBaseTy(info), Result(Result) {} 33131eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 331407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool Success(const ArrayRef<APValue> &V, const Expr *E) { 331507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith assert(V.size() == E->getType()->castAs<VectorType>()->getNumElements()); 331607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith // FIXME: remove this APValue copy. 331707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Result = APValue(V.data(), V.size()); 331807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return true; 331907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith } 332069c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith bool Success(const CCValue &V, const Expr *E) { 332169c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith assert(V.isVector()); 332207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Result = V; 332307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return true; 332407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith } 332551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E); 33261eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 332707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitUnaryReal(const UnaryOperator *E) 332891110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman { return Visit(E->getSubExpr()); } 332907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitCastExpr(const CastExpr* E); 333007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitInitListExpr(const InitListExpr *E); 333107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitUnaryImag(const UnaryOperator *E); 333291110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman // FIXME: Missing: unary -, unary ~, binary add/sub/mul/div, 33332217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman // binary comparisons, binary and/or/xor, 333491110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman // shufflevector, ExtVectorElementExpr 333559b5da6d853b4368b984700315adf7b37de05764Nate Begeman }; 333659b5da6d853b4368b984700315adf7b37de05764Nate Begeman} // end anonymous namespace 333759b5da6d853b4368b984700315adf7b37de05764Nate Begeman 333859b5da6d853b4368b984700315adf7b37de05764Nate Begemanstatic bool EvaluateVector(const Expr* E, APValue& Result, EvalInfo &Info) { 3339c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isVectorType() &&"not a vector rvalue"); 334007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return VectorExprEvaluator(Info, Result).Visit(E); 334159b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 334259b5da6d853b4368b984700315adf7b37de05764Nate Begeman 334307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool VectorExprEvaluator::VisitCastExpr(const CastExpr* E) { 334407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VTy = E->getType()->castAs<VectorType>(); 3345c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman unsigned NElts = VTy->getNumElements(); 33461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3347d62ca370b03b8c6ad58002d3399383baf744e32bRichard Smith const Expr *SE = E->getSubExpr(); 3348e8c9e9218f215ec6089f12b076c7b9d310fd5194Nate Begeman QualType SETy = SE->getType(); 334959b5da6d853b4368b984700315adf7b37de05764Nate Begeman 335046a523285928aa07bf14803178dc04616ac85994Eli Friedman switch (E->getCastKind()) { 335146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_VectorSplat: { 335207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith APValue Val = APValue(); 335346a523285928aa07bf14803178dc04616ac85994Eli Friedman if (SETy->isIntegerType()) { 335446a523285928aa07bf14803178dc04616ac85994Eli Friedman APSInt IntResult; 335546a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateInteger(SE, IntResult, Info)) 3356f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 335707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Val = APValue(IntResult); 335846a523285928aa07bf14803178dc04616ac85994Eli Friedman } else if (SETy->isRealFloatingType()) { 335946a523285928aa07bf14803178dc04616ac85994Eli Friedman APFloat F(0.0); 336046a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateFloat(SE, F, Info)) 3361f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 336207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Val = APValue(F); 336346a523285928aa07bf14803178dc04616ac85994Eli Friedman } else { 336407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Error(E); 336546a523285928aa07bf14803178dc04616ac85994Eli Friedman } 3366c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman 3367c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman // Splat and create vector APValue. 336807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith SmallVector<APValue, 4> Elts(NElts, Val); 336907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elts, E); 3370e8c9e9218f215ec6089f12b076c7b9d310fd5194Nate Begeman } 3371e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman case CK_BitCast: { 3372e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Evaluate the operand into an APInt we can extract from. 3373e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt SValInt; 3374e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (!EvalAndBitcastToAPInt(Info, SE, SValInt)) 3375e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 3376e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Extract the elements 3377e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType EltTy = VTy->getElementType(); 3378e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned EltSize = Info.Ctx.getTypeSize(EltTy); 3379e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); 3380e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman SmallVector<APValue, 4> Elts; 3381e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (EltTy->isRealFloatingType()) { 3382e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(EltTy); 3383e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool isIEESem = &Sem != &APFloat::PPCDoubleDouble; 3384e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned FloatEltSize = EltSize; 3385e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (&Sem == &APFloat::x87DoubleExtended) 3386e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman FloatEltSize = 80; 3387e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < NElts; i++) { 3388e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt Elt; 3389e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 3390e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotl(i*EltSize+FloatEltSize).trunc(FloatEltSize); 3391e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 3392e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotr(i*EltSize).trunc(FloatEltSize); 3393e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elts.push_back(APValue(APFloat(Elt, isIEESem))); 3394e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3395e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else if (EltTy->isIntegerType()) { 3396e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < NElts; i++) { 3397e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt Elt; 3398e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 3399e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotl(i*EltSize+EltSize).zextOrTrunc(EltSize); 3400e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 3401e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotr(i*EltSize).zextOrTrunc(EltSize); 3402e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elts.push_back(APValue(APSInt(Elt, EltTy->isSignedIntegerType()))); 3403e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3404e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else { 3405e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return Error(E); 3406e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3407e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return Success(Elts, E); 3408e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 340946a523285928aa07bf14803178dc04616ac85994Eli Friedman default: 3410c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 3411c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman } 341259b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 341359b5da6d853b4368b984700315adf7b37de05764Nate Begeman 341407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool 341559b5da6d853b4368b984700315adf7b37de05764Nate BegemanVectorExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 341607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VT = E->getType()->castAs<VectorType>(); 341759b5da6d853b4368b984700315adf7b37de05764Nate Begeman unsigned NumInits = E->getNumInits(); 341891110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman unsigned NumElements = VT->getNumElements(); 34191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 342059b5da6d853b4368b984700315adf7b37de05764Nate Begeman QualType EltTy = VT->getElementType(); 34215f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<APValue, 4> Elements; 342259b5da6d853b4368b984700315adf7b37de05764Nate Begeman 34233edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // The number of initializers can be less than the number of 34243edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // vector elements. For OpenCL, this can be due to nested vector 34253edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // initialization. For GCC compatibility, missing trailing elements 34263edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // should be initialized with zeroes. 34273edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman unsigned CountInits = 0, CountElts = 0; 34283edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman while (CountElts < NumElements) { 34293edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // Handle nested vector initialization. 34303edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits 34313edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman && E->getInit(CountInits)->getType()->isExtVectorType()) { 34323edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman APValue v; 34333edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateVector(E->getInit(CountInits), v, Info)) 34343edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 34353edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman unsigned vlen = v.getVectorLength(); 34363edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman for (unsigned j = 0; j < vlen; j++) 34373edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(v.getVectorElt(j)); 34383edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts += vlen; 34393edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else if (EltTy->isIntegerType()) { 344059b5da6d853b4368b984700315adf7b37de05764Nate Begeman llvm::APSInt sInt(32); 34413edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits) { 34423edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateInteger(E->getInit(CountInits), sInt, Info)) 34433edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 34443edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else // trailing integer zero. 34453edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman sInt = Info.Ctx.MakeIntValue(0, EltTy); 34463edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(APValue(sInt)); 34473edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts++; 344859b5da6d853b4368b984700315adf7b37de05764Nate Begeman } else { 344959b5da6d853b4368b984700315adf7b37de05764Nate Begeman llvm::APFloat f(0.0); 34503edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits) { 34513edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateFloat(E->getInit(CountInits), f, Info)) 34523edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 34533edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else // trailing float zero. 34543edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman f = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy)); 34553edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(APValue(f)); 34563edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts++; 345759b5da6d853b4368b984700315adf7b37de05764Nate Begeman } 34583edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountInits++; 345959b5da6d853b4368b984700315adf7b37de05764Nate Begeman } 346007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elements, E); 346159b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 346259b5da6d853b4368b984700315adf7b37de05764Nate Begeman 346307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool 346451201882382fb40c9456a06c7f93d6ddd4a57712Richard SmithVectorExprEvaluator::ZeroInitialization(const Expr *E) { 346507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VT = E->getType()->getAs<VectorType>(); 346691110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman QualType EltTy = VT->getElementType(); 346791110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman APValue ZeroElement; 346891110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman if (EltTy->isIntegerType()) 346991110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman ZeroElement = APValue(Info.Ctx.MakeIntValue(0, EltTy)); 347091110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman else 347191110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman ZeroElement = 347291110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman APValue(APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy))); 347391110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 34745f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<APValue, 4> Elements(VT->getNumElements(), ZeroElement); 347507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elements, E); 347691110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman} 347791110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 347807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool VectorExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 34798327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 348051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 348191110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman} 348291110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 348359b5da6d853b4368b984700315adf7b37de05764Nate Begeman//===----------------------------------------------------------------------===// 3484cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith// Array Evaluation 3485cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith//===----------------------------------------------------------------------===// 3486cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3487cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smithnamespace { 3488cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith class ArrayExprEvaluator 3489cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith : public ExprEvaluatorBase<ArrayExprEvaluator, bool> { 3490180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue &This; 3491cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith APValue &Result; 3492cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith public: 3493cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3494180f47959a066795cc0f409433023af448bb0328Richard Smith ArrayExprEvaluator(EvalInfo &Info, const LValue &This, APValue &Result) 3495180f47959a066795cc0f409433023af448bb0328Richard Smith : ExprEvaluatorBaseTy(Info), This(This), Result(Result) {} 3496cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3497cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith bool Success(const APValue &V, const Expr *E) { 3498cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith assert(V.isArray() && "Expected array type"); 3499cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith Result = V; 3500cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 3501cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 3502cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 350351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3504180f47959a066795cc0f409433023af448bb0328Richard Smith const ConstantArrayType *CAT = 3505180f47959a066795cc0f409433023af448bb0328Richard Smith Info.Ctx.getAsConstantArrayType(E->getType()); 3506180f47959a066795cc0f409433023af448bb0328Richard Smith if (!CAT) 3507f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3508180f47959a066795cc0f409433023af448bb0328Richard Smith 3509180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitArray(), 0, 3510180f47959a066795cc0f409433023af448bb0328Richard Smith CAT->getSize().getZExtValue()); 3511180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Result.hasArrayFiller()) return true; 3512180f47959a066795cc0f409433023af448bb0328Richard Smith 351351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Zero-initialize all elements. 3514180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3515b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 3516180f47959a066795cc0f409433023af448bb0328Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 3517180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateConstantExpression(Result.getArrayFiller(), Info, 3518180f47959a066795cc0f409433023af448bb0328Richard Smith Subobject, &VIE); 3519180f47959a066795cc0f409433023af448bb0328Richard Smith } 3520180f47959a066795cc0f409433023af448bb0328Richard Smith 3521cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith bool VisitInitListExpr(const InitListExpr *E); 3522e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E); 3523cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith }; 3524cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} // end anonymous namespace 3525cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3526180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateArray(const Expr *E, const LValue &This, 3527180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result, EvalInfo &Info) { 352851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith assert(E->isRValue() && E->getType()->isArrayType() && "not an array rvalue"); 3529180f47959a066795cc0f409433023af448bb0328Richard Smith return ArrayExprEvaluator(Info, This, Result).Visit(E); 3530cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 3531cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3532cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smithbool ArrayExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 3533cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(E->getType()); 3534cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (!CAT) 3535f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3536cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3537974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // C++11 [dcl.init.string]p1: A char array [...] can be initialized by [...] 3538974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // an appropriately-typed string literal enclosed in braces. 3539ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (E->getNumInits() == 1 && E->getInit(0)->isGLValue() && 3540974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith Info.Ctx.hasSameUnqualifiedType(E->getType(), E->getInit(0)->getType())) { 3541974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith LValue LV; 3542974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith if (!EvaluateLValue(E->getInit(0), LV, Info)) 3543974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith return false; 3544974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith uint64_t NumElements = CAT->getSize().getZExtValue(); 3545974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith Result = APValue(APValue::UninitArray(), NumElements, NumElements); 3546974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith 3547974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // Copy the string literal into the array. FIXME: Do this better. 3548b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LV.addArray(Info, E, CAT); 3549974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith for (uint64_t I = 0; I < NumElements; ++I) { 3550974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith CCValue Char; 3551974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith if (!HandleLValueToRValueConversion(Info, E->getInit(0), 3552745f5147e065900267c85a5568785a1991d4838fRichard Smith CAT->getElementType(), LV, Char) || 3553745f5147e065900267c85a5568785a1991d4838fRichard Smith !CheckConstantExpression(Info, E->getInit(0), Char, 3554745f5147e065900267c85a5568785a1991d4838fRichard Smith Result.getArrayInitializedElt(I)) || 3555745f5147e065900267c85a5568785a1991d4838fRichard Smith !HandleLValueArrayAdjustment(Info, E->getInit(0), LV, 3556b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CAT->getElementType(), 1)) 3557974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith return false; 3558974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith } 3559974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith return true; 3560974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith } 3561974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith 3562745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 3563745f5147e065900267c85a5568785a1991d4838fRichard Smith 3564cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith Result = APValue(APValue::UninitArray(), E->getNumInits(), 3565cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith CAT->getSize().getZExtValue()); 3566180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3567b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 3568180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned Index = 0; 3569cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith for (InitListExpr::const_iterator I = E->begin(), End = E->end(); 3570180f47959a066795cc0f409433023af448bb0328Richard Smith I != End; ++I, ++Index) { 3571180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateConstantExpression(Result.getArrayInitializedElt(Index), 3572745f5147e065900267c85a5568785a1991d4838fRichard Smith Info, Subobject, cast<Expr>(*I)) || 3573745f5147e065900267c85a5568785a1991d4838fRichard Smith !HandleLValueArrayAdjustment(Info, cast<Expr>(*I), Subobject, 3574745f5147e065900267c85a5568785a1991d4838fRichard Smith CAT->getElementType(), 1)) { 3575745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 3576745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 3577745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 3578745f5147e065900267c85a5568785a1991d4838fRichard Smith } 3579180f47959a066795cc0f409433023af448bb0328Richard Smith } 3580cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3581745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Result.hasArrayFiller()) return Success; 3582cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith assert(E->hasArrayFiller() && "no array filler for incomplete init list"); 3583180f47959a066795cc0f409433023af448bb0328Richard Smith // FIXME: The Subobject here isn't necessarily right. This rarely matters, 3584180f47959a066795cc0f409433023af448bb0328Richard Smith // but sometimes does: 3585180f47959a066795cc0f409433023af448bb0328Richard Smith // struct S { constexpr S() : p(&p) {} void *p; }; 3586180f47959a066795cc0f409433023af448bb0328Richard Smith // S s[10] = {}; 3587cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return EvaluateConstantExpression(Result.getArrayFiller(), Info, 3588745f5147e065900267c85a5568785a1991d4838fRichard Smith Subobject, E->getArrayFiller()) && Success; 3589cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 3590cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3591e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool ArrayExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) { 3592e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(E->getType()); 3593e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!CAT) 3594f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3595e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3596ec789163a42a7be654ac34aadb750b508954d53cRichard Smith bool HadZeroInit = !Result.isUninit(); 3597ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!HadZeroInit) 3598ec789163a42a7be654ac34aadb750b508954d53cRichard Smith Result = APValue(APValue::UninitArray(), 0, CAT->getSize().getZExtValue()); 3599e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.hasArrayFiller()) 3600e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3601e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3602e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXConstructorDecl *FD = E->getConstructor(); 36036180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 360451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInit = E->requiresZeroInitialization(); 360551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) { 3606ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (HadZeroInit) 3607ec789163a42a7be654ac34aadb750b508954d53cRichard Smith return true; 3608ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 360951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit) { 361051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3611b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 361251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 361351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return EvaluateConstantExpression(Result.getArrayFiller(), Info, 361451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Subobject, &VIE); 361551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 361651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 36176180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith const CXXRecordDecl *RD = FD->getParent(); 36186180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (RD->isUnion()) 36196180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result.getArrayFiller() = APValue((FieldDecl*)0); 36206180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith else 36216180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result.getArrayFiller() = 36226180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith APValue(APValue::UninitStruct(), RD->getNumBases(), 36236180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith std::distance(RD->field_begin(), RD->field_end())); 36246180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 36256180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 36266180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 3627e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const FunctionDecl *Definition = 0; 3628e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith FD->getBody(Definition); 3629e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3630c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition)) 3631c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 3632e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3633e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // FIXME: The Subobject here isn't necessarily right. This rarely matters, 3634e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // but sometimes does: 3635e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // struct S { constexpr S() : p(&p) {} void *p; }; 3636e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // S s[10]; 3637e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue Subobject = This; 3638b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 363951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3640ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (ZeroInit && !HadZeroInit) { 364151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 364251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!EvaluateConstantExpression(Result.getArrayFiller(), Info, Subobject, 364351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith &VIE)) 364451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 364551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 364651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3647e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 3648745f5147e065900267c85a5568785a1991d4838fRichard Smith return HandleConstructorCall(E->getExprLoc(), Subobject, Args, 3649e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith cast<CXXConstructorDecl>(Definition), 3650e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Info, Result.getArrayFiller()); 3651e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3652e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3653cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith//===----------------------------------------------------------------------===// 3654f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner// Integer Evaluation 3655c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 3656c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// As a GNU extension, we support casting pointers to sufficiently-wide integer 3657c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// types and back in constant folding. Integer values are thus represented 3658c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// either as an integer-valued APValue, or as an lvalue-valued APValue. 3659f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 3660f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3661f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnernamespace { 3662770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass IntExprEvaluator 36638cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<IntExprEvaluator, bool> { 366447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue &Result; 3665f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnerpublic: 366647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith IntExprEvaluator(EvalInfo &info, CCValue &result) 36678cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(result) {} 3668f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3669973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool Success(const llvm::APSInt &SI, const Expr *E) { 3670973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(E->getType()->isIntegralOrEnumerationType() && 36712ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 3672973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(SI.isSigned() == E->getType()->isSignedIntegerOrEnumerationType() && 36733f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 3674973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(SI.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && 36753f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 367647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = CCValue(SI); 36773f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar return true; 36783f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 36793f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar 3680131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar bool Success(const llvm::APInt &I, const Expr *E) { 36812ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor assert(E->getType()->isIntegralOrEnumerationType() && 36822ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 368330c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar assert(I.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && 36843f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 368547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = CCValue(APSInt(I)); 3686575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor Result.getInt().setIsUnsigned( 3687575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor E->getType()->isUnsignedIntegerOrEnumerationType()); 3688131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return true; 3689131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 3690131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 3691131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar bool Success(uint64_t Value, const Expr *E) { 36922ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor assert(E->getType()->isIntegralOrEnumerationType() && 36932ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 369447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = CCValue(Info.Ctx.MakeIntValue(Value, E->getType())); 3695131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return true; 3696131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 3697131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 36984f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck bool Success(CharUnits Size, const Expr *E) { 36994f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(Size.getQuantity(), E); 37004f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck } 37014f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck 370247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith bool Success(const CCValue &V, const Expr *E) { 37035930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (V.isLValue() || V.isAddrLabelDiff()) { 3704342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith Result = V; 3705342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith return true; 3706342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith } 37078cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return Success(V.getInt(), E); 370832fea9d18cc3658a1b01df5ca6f2ac302625c61dChris Lattner } 37091eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 371051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { return Success(0, E); } 3711f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 37128cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 37138cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne // Visitor Methods 37148cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 3715f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 37164c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner bool VisitIntegerLiteral(const IntegerLiteral *E) { 3717131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 37184c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner } 37194c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner bool VisitCharacterLiteral(const CharacterLiteral *E) { 3720131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 37214c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner } 3722043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman 3723043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool CheckReferencedDecl(const Expr *E, const Decl *D); 3724043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool VisitDeclRefExpr(const DeclRefExpr *E) { 37258cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (CheckReferencedDecl(E, E->getDecl())) 37268cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 37278cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 37288cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitDeclRefExpr(E); 3729043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 3730043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool VisitMemberExpr(const MemberExpr *E) { 3731043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman if (CheckReferencedDecl(E, E->getMemberDecl())) { 3732c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith VisitIgnoredValue(E->getBase()); 3733043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman return true; 3734043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 37358cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 37368cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitMemberExpr(E); 3737043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 3738043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman 37398cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCallExpr(const CallExpr *E); 3740b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner bool VisitBinaryOperator(const BinaryOperator *E); 37418ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor bool VisitOffsetOfExpr(const OffsetOfExpr *E); 3742b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner bool VisitUnaryOperator(const UnaryOperator *E); 3743f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 37448cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr* E); 3745f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E); 37460518999d3adcc289997bd974dce90cc97f5c1c44Sebastian Redl 37473068d117951a8df54bae9db039b56201ab10962bAnders Carlsson bool VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) { 3748131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 37493068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 37501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3751f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith // Note, GNU defines __null as an integer, not a pointer. 37523f70456b8adb0405ef2a47d51f9fc2d5937ae8aeAnders Carlsson bool VisitGNUNullExpr(const GNUNullExpr *E) { 375351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 3754664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman } 3755664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 375664b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl bool VisitUnaryTypeTraitExpr(const UnaryTypeTraitExpr *E) { 37570dfd848fa4c9664852ba8c929a8bd3fce93ddca2Sebastian Redl return Success(E->getValue(), E); 375864b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl } 375964b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl 37606ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet bool VisitBinaryTypeTraitExpr(const BinaryTypeTraitExpr *E) { 37616ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet return Success(E->getValue(), E); 37626ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet } 37636ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet 376421ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley bool VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) { 376521ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley return Success(E->getValue(), E); 376621ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley } 376721ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley 3768552622067dc45013d240f73952fece703f5e63bdJohn Wiegley bool VisitExpressionTraitExpr(const ExpressionTraitExpr *E) { 3769552622067dc45013d240f73952fece703f5e63bdJohn Wiegley return Success(E->getValue(), E); 3770552622067dc45013d240f73952fece703f5e63bdJohn Wiegley } 3771552622067dc45013d240f73952fece703f5e63bdJohn Wiegley 3772722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman bool VisitUnaryReal(const UnaryOperator *E); 3773664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman bool VisitUnaryImag(const UnaryOperator *E); 3774664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 3775295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl bool VisitCXXNoexceptExpr(const CXXNoexceptExpr *E); 3776ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor bool VisitSizeOfPackExpr(const SizeOfPackExpr *E); 3777cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 3778fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattnerprivate: 37798b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck CharUnits GetAlignOfExpr(const Expr *E); 37808b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck CharUnits GetAlignOfType(QualType T); 37811bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith static QualType GetObjectType(APValue::LValueBase B); 37828cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool TryEvaluateBuiltinObjectSize(const CallExpr *E); 3783664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman // FIXME: Missing: array subscript of vector, member of vector 3784f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner}; 3785f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} // end anonymous namespace 3786f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3787c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// EvaluateIntegerOrLValue - Evaluate an rvalue integral-typed expression, and 3788c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// produce either the integer value or a pointer. 3789c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// 3790c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// GCC has a heinous extension which folds casts between pointer types and 3791c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// pointer-sized integral types. We support this by allowing the evaluation of 3792c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// an integer rvalue to produce a pointer (represented as an lvalue) instead. 3793c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// Some simple arithmetic on such values is supported (they are treated much 3794c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// like char*). 3795f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateIntegerOrLValue(const Expr *E, CCValue &Result, 379647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith EvalInfo &Info) { 3797c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isIntegralOrEnumerationType()); 37988cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return IntExprEvaluator(Info, Result).Visit(E); 379969ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar} 380069ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar 3801f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info) { 380247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue Val; 3803f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateIntegerOrLValue(E, Val, Info)) 3804f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 3805f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Val.isInt()) { 3806f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: It would be better to produce the diagnostic for casting 3807f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // a pointer to an integer. 3808dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 380930c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return false; 3810f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 381130c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar Result = Val.getInt(); 381230c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return true; 3813f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} 3814f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3815f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Check whether the given declaration can be directly converted to an integral 3816f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// rvalue. If not, no diagnostic is produced; there are other things we can 3817f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// try. 3818043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedmanbool IntExprEvaluator::CheckReferencedDecl(const Expr* E, const Decl* D) { 38194c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // Enums are integer constant exprs. 3820bfbdcd861a4364bfc21a9e5047bdbd56812d6693Abramo Bagnara if (const EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(D)) { 3821973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // Check for signedness/width mismatches between E type and ECD value. 3822973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool SameSign = (ECD->getInitVal().isSigned() 3823973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara == E->getType()->isSignedIntegerOrEnumerationType()); 3824973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool SameWidth = (ECD->getInitVal().getBitWidth() 3825973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara == Info.Ctx.getIntWidth(E->getType())); 3826973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (SameSign && SameWidth) 3827973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara return Success(ECD->getInitVal(), E); 3828973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara else { 3829973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // Get rid of mismatch (otherwise Success assertions will fail) 3830973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // by computing a new value matching the type of E. 3831973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara llvm::APSInt Val = ECD->getInitVal(); 3832973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (!SameSign) 3833973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara Val.setIsSigned(!ECD->getInitVal().isSigned()); 3834973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (!SameWidth) 3835973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara Val = Val.extOrTrunc(Info.Ctx.getIntWidth(E->getType())); 3836973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara return Success(Val, E); 3837973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara } 3838bfbdcd861a4364bfc21a9e5047bdbd56812d6693Abramo Bagnara } 38398cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return false; 38404c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner} 38414c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner 3842a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner/// EvaluateBuiltinClassifyType - Evaluate __builtin_classify_type the same way 3843a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner/// as GCC. 3844a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattnerstatic int EvaluateBuiltinClassifyType(const CallExpr *E) { 3845a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner // The following enum mimics the values returned by GCC. 38467c80bd64032e610c0dbd74fc0ef6ea334447f2fdSebastian Redl // FIXME: Does GCC differ between lvalue and rvalue references here? 3847a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner enum gcc_type_class { 3848a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner no_type_class = -1, 3849a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner void_type_class, integer_type_class, char_type_class, 3850a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner enumeral_type_class, boolean_type_class, 3851a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner pointer_type_class, reference_type_class, offset_type_class, 3852a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner real_type_class, complex_type_class, 3853a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner function_type_class, method_type_class, 3854a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner record_type_class, union_type_class, 3855a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner array_type_class, string_type_class, 3856a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner lang_type_class 3857a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner }; 38581eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 38591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If no argument was supplied, default to "no_type_class". This isn't 3860a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner // ideal, however it is what gcc does. 3861a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner if (E->getNumArgs() == 0) 3862a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return no_type_class; 38631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3864a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner QualType ArgTy = E->getArg(0)->getType(); 3865a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner if (ArgTy->isVoidType()) 3866a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return void_type_class; 3867a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isEnumeralType()) 3868a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return enumeral_type_class; 3869a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isBooleanType()) 3870a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return boolean_type_class; 3871a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isCharType()) 3872a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return string_type_class; // gcc doesn't appear to use char_type_class 3873a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isIntegerType()) 3874a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return integer_type_class; 3875a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isPointerType()) 3876a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return pointer_type_class; 3877a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isReferenceType()) 3878a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return reference_type_class; 3879a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isRealType()) 3880a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return real_type_class; 3881a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isComplexType()) 3882a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return complex_type_class; 3883a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isFunctionType()) 3884a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return function_type_class; 3885fb87b89fc9eb103e19fb8e4b925c23f0bd091b99Douglas Gregor else if (ArgTy->isStructureOrClassType()) 3886a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return record_type_class; 3887a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isUnionType()) 3888a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return union_type_class; 3889a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isArrayType()) 3890a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return array_type_class; 3891a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isUnionType()) 3892a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return union_type_class; 3893a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else // FIXME: offset_type_class, method_type_class, & lang_type_class? 3894b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("CallExpr::isBuiltinClassifyType(): unimplemented type"); 3895a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner} 3896a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner 389780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// EvaluateBuiltinConstantPForLValue - Determine the result of 389880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// __builtin_constant_p when applied to the given lvalue. 389980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// 390080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// An lvalue is only "constant" if it is a pointer or reference to the first 390180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// character of a string literal. 390280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithtemplate<typename LValue> 390380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithstatic bool EvaluateBuiltinConstantPForLValue(const LValue &LV) { 390480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith const Expr *E = LV.getLValueBase().dyn_cast<const Expr*>(); 390580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return E && isa<StringLiteral>(E) && LV.getLValueOffset().isZero(); 390680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith} 390780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 390880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// EvaluateBuiltinConstantP - Evaluate __builtin_constant_p as similarly to 390980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// GCC as we can manage. 391080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithstatic bool EvaluateBuiltinConstantP(ASTContext &Ctx, const Expr *Arg) { 391180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith QualType ArgType = Arg->getType(); 391280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 391380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // __builtin_constant_p always has one operand. The rules which gcc follows 391480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // are not precisely documented, but are as follows: 391580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 391680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // - If the operand is of integral, floating, complex or enumeration type, 391780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // and can be folded to a known value of that type, it returns 1. 391880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // - If the operand and can be folded to a pointer to the first character 391980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // of a string literal (or such a pointer cast to an integral type), it 392080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // returns 1. 392180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 392280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // Otherwise, it returns 0. 392380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 392480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // FIXME: GCC also intends to return 1 for literals of aggregate types, but 392580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // its support for this does not currently work. 392680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (ArgType->isIntegralOrEnumerationType()) { 392780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith Expr::EvalResult Result; 392880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!Arg->EvaluateAsRValue(Result, Ctx) || Result.HasSideEffects) 392980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 393080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 393180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith APValue &V = Result.Val; 393280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (V.getKind() == APValue::Int) 393380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return true; 393480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 393580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return EvaluateBuiltinConstantPForLValue(V); 393680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } else if (ArgType->isFloatingType() || ArgType->isAnyComplexType()) { 393780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return Arg->isEvaluatable(Ctx); 393880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } else if (ArgType->isPointerType() || Arg->isGLValue()) { 393980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith LValue LV; 394080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith Expr::EvalStatus Status; 394180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith EvalInfo Info(Ctx, Status); 394280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if ((Arg->isGLValue() ? EvaluateLValue(Arg, LV, Info) 394380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith : EvaluatePointer(Arg, LV, Info)) && 394480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith !Status.HasSideEffects) 394580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return EvaluateBuiltinConstantPForLValue(LV); 394680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } 394780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 394880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // Anything else isn't considered to be sufficiently constant. 394980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 395080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith} 395180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 395242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall/// Retrieves the "underlying object type" of the given expression, 395342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall/// as used by __builtin_object_size. 39541bf9a9e6a5bdc0de7939908855dcddf46b661800Richard SmithQualType IntExprEvaluator::GetObjectType(APValue::LValueBase B) { 39551bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { 39561bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 395742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return VD->getType(); 39581bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith } else if (const Expr *E = B.get<const Expr*>()) { 39591bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (isa<CompoundLiteralExpr>(E)) 39601bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return E->getType(); 396142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall } 396242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 396342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return QualType(); 396442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 396542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 39668cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::TryEvaluateBuiltinObjectSize(const CallExpr *E) { 396742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall // TODO: Perhaps we should let LLVM lower this? 396842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall LValue Base; 396942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (!EvaluatePointer(E->getArg(0), Base, Info)) 397042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return false; 397142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 397242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall // If we can prove the base is null, lower to zero now. 39731bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!Base.getLValueBase()) return Success(0, E); 397442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 39751bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType T = GetObjectType(Base.getLValueBase()); 397642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (T.isNull() || 397742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isIncompleteType() || 39781357869bc5983cdfbc986db1f3d18265bb34cb0eEli Friedman T->isFunctionType() || 397942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isVariablyModifiedType() || 398042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isDependentType()) 3981f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 398242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 398342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall CharUnits Size = Info.Ctx.getTypeSizeInChars(T); 398442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall CharUnits Offset = Base.getLValueOffset(); 398542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 398642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (!Offset.isNegative() && Offset <= Size) 398742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall Size -= Offset; 398842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall else 398942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall Size = CharUnits::Zero(); 39904f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(Size, E); 399142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 399242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 39938cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitCallExpr(const CallExpr *E) { 3994180f47959a066795cc0f409433023af448bb0328Richard Smith switch (E->isBuiltinCall()) { 3995019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner default: 39968cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 399764eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 399864eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump case Builtin::BI__builtin_object_size: { 399942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (TryEvaluateBuiltinObjectSize(E)) 400042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return true; 400164eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 4002b2aaf51ed73a4774322a39a0dd59d0fe7e3258c0Eric Christopher // If evaluating the argument has side-effects we can't determine 4003b2aaf51ed73a4774322a39a0dd59d0fe7e3258c0Eric Christopher // the size of the object and lower it to unknown now. 4004393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian if (E->getArg(0)->HasSideEffects(Info.Ctx)) { 4005a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith if (E->getArg(1)->EvaluateKnownConstInt(Info.Ctx).getZExtValue() <= 1) 4006cf184655319cf7a5b811067cff9d26a5741fd161Chris Lattner return Success(-1ULL, E); 400764eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump return Success(0, E); 400864eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump } 4009c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 4010f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 401164eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump } 401264eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 4013019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_classify_type: 4014131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(EvaluateBuiltinClassifyType(E), E); 40151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 401680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith case Builtin::BI__builtin_constant_p: 401780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return Success(EvaluateBuiltinConstantP(Info.Ctx, E->getArg(0)), E); 4018e052d46f4db91f9ba572859ffc984e85cbf5d5ffRichard Smith 401921fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner case Builtin::BI__builtin_eh_return_data_regno: { 4020a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith int Operand = E->getArg(0)->EvaluateKnownConstInt(Info.Ctx).getZExtValue(); 4021bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor Operand = Info.Ctx.getTargetInfo().getEHDataRegisterNumber(Operand); 402221fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner return Success(Operand, E); 402321fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner } 4024c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman 4025c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman case Builtin::BI__builtin_expect: 4026c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman return Visit(E->getArg(0)); 402740b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith 40285726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor case Builtin::BIstrlen: 402940b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith // A call to strlen is not a constant expression. 403040b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith if (Info.getLangOpts().CPlusPlus0x) 403140b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_invalid_function) 403240b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith << /*isConstexpr*/0 << /*isConstructor*/0 << "'strlen'"; 403340b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith else 403440b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 403540b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith // Fall through. 40365726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor case Builtin::BI__builtin_strlen: 40375726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // As an extension, we support strlen() and __builtin_strlen() as constant 40385726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // expressions when the argument is a string literal. 40398cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (const StringLiteral *S 40405726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor = dyn_cast<StringLiteral>(E->getArg(0)->IgnoreParenImpCasts())) { 40415726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // The string literal may have embedded null characters. Find the first 40425726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // one and truncate there. 40435f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef Str = S->getString(); 40445f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef::size_type Pos = Str.find(0); 40455f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner if (Pos != StringRef::npos) 40465726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor Str = Str.substr(0, Pos); 40475726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor 40485726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor return Success(Str.size(), E); 40495726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor } 40505726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor 4051f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4052454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4053454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman case Builtin::BI__atomic_is_lock_free: { 4054454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman APSInt SizeVal; 4055454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (!EvaluateInteger(E->getArg(0), SizeVal, Info)) 4056454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return false; 4057454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4058454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // For __atomic_is_lock_free(sizeof(_Atomic(T))), if the size is a power 4059454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // of two less than the maximum inline atomic width, we know it is 4060454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // lock-free. If the size isn't a power of two, or greater than the 4061454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // maximum alignment where we promote atomics, we know it is not lock-free 4062454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // (at least not in the sense of atomic_is_lock_free). Otherwise, 4063454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // the answer can only be determined at runtime; for example, 16-byte 4064454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // atomics have lock-free implementations on some, but not all, 4065454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // x86-64 processors. 4066454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4067454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check power-of-two. 4068454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman CharUnits Size = CharUnits::fromQuantity(SizeVal.getZExtValue()); 4069454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (!Size.isPowerOfTwo()) 4070454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#if 0 4071454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // FIXME: Suppress this folding until the ABI for the promotion width 4072454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // settles. 4073454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return Success(0, E); 4074454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#else 4075f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4076454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#endif 4077454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4078454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#if 0 4079454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check against promotion width. 4080454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // FIXME: Suppress this folding until the ABI for the promotion width 4081454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // settles. 4082454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman unsigned PromoteWidthBits = 4083454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman Info.Ctx.getTargetInfo().getMaxAtomicPromoteWidth(); 4084454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (Size > Info.Ctx.toCharUnitsFromBits(PromoteWidthBits)) 4085454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return Success(0, E); 4086454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#endif 4087454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4088454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check against inlining width. 4089454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman unsigned InlineWidthBits = 4090454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman Info.Ctx.getTargetInfo().getMaxAtomicInlineWidth(); 4091454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (Size <= Info.Ctx.toCharUnitsFromBits(InlineWidthBits)) 4092454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return Success(1, E); 4093454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4094f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4095454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman } 4096019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner } 40974c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner} 4098f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4099625b80755b603d28f36fb4212c81484d87ad08d3Richard Smithstatic bool HasSameBase(const LValue &A, const LValue &B) { 4100625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!A.getLValueBase()) 4101625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return !B.getLValueBase(); 4102625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!B.getLValueBase()) 4103625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4104625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 41051bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (A.getLValueBase().getOpaqueValue() != 41061bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith B.getLValueBase().getOpaqueValue()) { 4107625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const Decl *ADecl = GetLValueBaseDecl(A); 4108625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!ADecl) 4109625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4110625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const Decl *BDecl = GetLValueBaseDecl(B); 41119a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (!BDecl || ADecl->getCanonicalDecl() != BDecl->getCanonicalDecl()) 4112625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4113625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith } 4114625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 4115625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return IsGlobalLValue(A.getLValueBase()) || 4116177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith A.getLValueFrame() == B.getLValueFrame(); 4117625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith} 4118625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 4119b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattnerbool IntExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 4120c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isAssignmentOp()) 4121f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4122c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 41232de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Comma) { 41248327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getLHS()); 41258327fad71da34492d82c532f42a58cb4baff81a3Richard Smith return Visit(E->getRHS()); 4126a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 4127a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4128a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman if (E->isLogicalOp()) { 4129a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman // These need to be handled specially because the operands aren't 4130a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman // necessarily integral 4131fcb4d09531abbf2a5cf398c2f946fb3bc2875f64Anders Carlsson bool lhsResult, rhsResult; 41321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4133c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (EvaluateAsBooleanCondition(E->getLHS(), lhsResult, Info)) { 413451fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson // We were able to evaluate the LHS, see if we can get away with not 413551fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson // evaluating the RHS: 0 && X -> 0, 1 || X -> 1 41362de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (lhsResult == (E->getOpcode() == BO_LOr)) 41373f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar return Success(lhsResult, E); 4138a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4139c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (EvaluateAsBooleanCondition(E->getRHS(), rhsResult, Info)) { 41402de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_LOr) 4141131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(lhsResult || rhsResult, E); 41424bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson else 4143131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(lhsResult && rhsResult, E); 41444bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson } 41454bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson } else { 4146f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: If both evaluations fail, we should produce the diagnostic from 4147f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // the LHS. If the LHS is non-constant and the RHS is unevaluatable, it's 4148f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // less clear how to diagnose this. 4149c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (EvaluateAsBooleanCondition(E->getRHS(), rhsResult, Info)) { 41504bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson // We can't evaluate the LHS; however, sometimes the result 41514bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson // is determined by the RHS: X && 0 -> 0, X || 1 -> 1. 4152f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (rhsResult == (E->getOpcode() == BO_LOr)) { 4153131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar // Since we weren't able to evaluate the left hand side, it 4154fcb4d09531abbf2a5cf398c2f946fb3bc2875f64Anders Carlsson // must have had side effects. 41551e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith Info.EvalStatus.HasSideEffects = true; 4156131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 4157131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(rhsResult, E); 41584bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson } 41594bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson } 4160a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 4161a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4162a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman return false; 4163c8cc9ccc7b87a7ed1749b074f6b670bcec49abc1Chris Lattner } 416454176fdb044312b4b77c3da6682d3575b3728d30Chris Lattner 4165286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson QualType LHSTy = E->getLHS()->getType(); 4166286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson QualType RHSTy = E->getRHS()->getType(); 41674087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 41684087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar if (LHSTy->isAnyComplexType()) { 41694087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar assert(RHSTy->isAnyComplexType() && "Invalid comparison"); 4170f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS, RHS; 41714087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 4172745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateComplex(E->getLHS(), LHS, Info); 4173745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 41744087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar return false; 41754087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 4176745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK) 41774087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar return false; 41784087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 41794087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar if (LHS.isComplexFloat()) { 41801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump APFloat::cmpResult CR_r = 41814087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar LHS.getComplexFloatReal().compare(RHS.getComplexFloatReal()); 41821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump APFloat::cmpResult CR_i = 41834087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar LHS.getComplexFloatImag().compare(RHS.getComplexFloatImag()); 41844087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 41852de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_EQ) 4186131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((CR_r == APFloat::cmpEqual && 4187131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar CR_i == APFloat::cmpEqual), E); 4188131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar else { 41892de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall assert(E->getOpcode() == BO_NE && 4190131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar "Invalid complex comparison."); 41911eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(((CR_r == APFloat::cmpGreaterThan || 4192fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_r == APFloat::cmpLessThan || 4193fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_r == APFloat::cmpUnordered) || 41941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump (CR_i == APFloat::cmpGreaterThan || 4195fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_i == APFloat::cmpLessThan || 4196fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_i == APFloat::cmpUnordered)), E); 4197131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 41984087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } else { 41992de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_EQ) 4200131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((LHS.getComplexIntReal() == RHS.getComplexIntReal() && 4201131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar LHS.getComplexIntImag() == RHS.getComplexIntImag()), E); 4202131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar else { 42032de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall assert(E->getOpcode() == BO_NE && 4204131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar "Invalid compex comparison."); 4205131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((LHS.getComplexIntReal() != RHS.getComplexIntReal() || 4206131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar LHS.getComplexIntImag() != RHS.getComplexIntImag()), E); 4207131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 42084087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } 42094087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } 42101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4211286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson if (LHSTy->isRealFloatingType() && 4212286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson RHSTy->isRealFloatingType()) { 4213286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson APFloat RHS(0.0), LHS(0.0); 42141eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4215745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateFloat(E->getRHS(), RHS, Info); 4216745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 4217286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson return false; 42181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4219745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateFloat(E->getLHS(), LHS, Info) || !LHSOK) 4220286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson return false; 42211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4222286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson APFloat::cmpResult CR = LHS.compare(RHS); 4223529569e68d10b0fd3750fd2124faf742249b846bAnders Carlsson 4224286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson switch (E->getOpcode()) { 4225286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson default: 4226b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Invalid binary operator!"); 42272de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LT: 4228131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpLessThan, E); 42292de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GT: 4230131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpGreaterThan, E); 42312de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LE: 4232131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpLessThan || CR == APFloat::cmpEqual, E); 42332de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GE: 42341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(CR == APFloat::cmpGreaterThan || CR == APFloat::cmpEqual, 4235131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar E); 42362de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_EQ: 4237131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpEqual, E); 42382de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_NE: 42391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(CR == APFloat::cmpGreaterThan 4240fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang || CR == APFloat::cmpLessThan 4241fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang || CR == APFloat::cmpUnordered, E); 4242286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson } 4243286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson } 42441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4245ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman if (LHSTy->isPointerType() && RHSTy->isPointerType()) { 4246625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (E->getOpcode() == BO_Sub || E->isComparisonOp()) { 4247745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue LHSValue, RHSValue; 4248745f5147e065900267c85a5568785a1991d4838fRichard Smith 4249745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluatePointer(E->getLHS(), LHSValue, Info); 4250745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && Info.keepEvaluatingAfterFailure()) 42513068d117951a8df54bae9db039b56201ab10962bAnders Carlsson return false; 4252a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4253745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluatePointer(E->getRHS(), RHSValue, Info) || !LHSOK) 42543068d117951a8df54bae9db039b56201ab10962bAnders Carlsson return false; 4255a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4256625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith // Reject differing bases from the normal codepath; we special-case 4257625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith // comparisons to null. 4258625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!HasSameBase(LHSValue, RHSValue)) { 425965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (E->getOpcode() == BO_Sub) { 426065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Handle &&A - &&B. 426165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSValue.Offset.isZero() || !RHSValue.Offset.isZero()) 426265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 426365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *LHSExpr = LHSValue.Base.dyn_cast<const Expr*>(); 426465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *RHSExpr = LHSValue.Base.dyn_cast<const Expr*>(); 426565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSExpr || !RHSExpr) 426665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 426765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); 426865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); 426965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSAddrExpr || !RHSAddrExpr) 427065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 42715930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman // Make sure both labels come from the same function. 42725930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (LHSAddrExpr->getLabel()->getDeclContext() != 42735930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman RHSAddrExpr->getLabel()->getDeclContext()) 42745930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman return false; 427565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman Result = CCValue(LHSAddrExpr, RHSAddrExpr); 427665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return true; 427765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman } 42789e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // Inequalities and subtractions between unrelated pointers have 42799e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // unspecified or undefined behavior. 42805bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman if (!E->isEqualityOp()) 4281f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4282ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman // A constant address may compare equal to the address of a symbol. 4283ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman // The one exception is that address of an object cannot compare equal 4284c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // to a null pointer constant. 4285ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman if ((!LHSValue.Base && !LHSValue.Offset.isZero()) || 4286ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman (!RHSValue.Base && !RHSValue.Offset.isZero())) 4287f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 42889e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // It's implementation-defined whether distinct literals will have 4289c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // distinct addresses. In clang, we do not guarantee the addresses are 429074f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith // distinct. However, we do know that the address of a literal will be 429174f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith // non-null. 429274f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith if ((IsLiteralLValue(LHSValue) || IsLiteralLValue(RHSValue)) && 429374f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith LHSValue.Base && RHSValue.Base) 4294f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 42959e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // We can't tell whether weak symbols will end up pointing to the same 42969e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // object. 42979e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith if (IsWeakLValue(LHSValue) || IsWeakLValue(RHSValue)) 4298f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 42999e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // Pointers with different bases cannot represent the same object. 4300c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // (Note that clang defaults to -fmerge-all-constants, which can 4301c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // lead to inconsistent results for comparisons involving the address 4302c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // of a constant; this generally doesn't matter in practice.) 43039e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith return Success(E->getOpcode() == BO_NE, E); 43045bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman } 4305a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4306cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // FIXME: Implement the C++11 restrictions: 4307cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // - Pointer subtractions must be on elements of the same array. 4308cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // - Pointer comparisons must be between members with the same access. 4309cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 43102de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Sub) { 43114992bdde387c5f033bb450a716eaabc0fda52688Chris Lattner QualType Type = E->getLHS()->getType(); 43124992bdde387c5f033bb450a716eaabc0fda52688Chris Lattner QualType ElementType = Type->getAs<PointerType>()->getPointeeType(); 43133068d117951a8df54bae9db039b56201ab10962bAnders Carlsson 4314180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits ElementSize; 4315180f47959a066795cc0f409433023af448bb0328Richard Smith if (!HandleSizeof(Info, ElementType, ElementSize)) 4316180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 4317a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4318180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits Diff = LHSValue.getLValueOffset() - 4319a73058324197b7bdfd19307965954f626e26199dKen Dyck RHSValue.getLValueOffset(); 4320a73058324197b7bdfd19307965954f626e26199dKen Dyck return Success(Diff / ElementSize, E); 4321ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman } 4322625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 4323625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const CharUnits &LHSOffset = LHSValue.getLValueOffset(); 4324625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const CharUnits &RHSOffset = RHSValue.getLValueOffset(); 4325625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith switch (E->getOpcode()) { 4326625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith default: llvm_unreachable("missing comparison operator"); 4327625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_LT: return Success(LHSOffset < RHSOffset, E); 4328625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_GT: return Success(LHSOffset > RHSOffset, E); 4329625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_LE: return Success(LHSOffset <= RHSOffset, E); 4330625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_GE: return Success(LHSOffset >= RHSOffset, E); 4331625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_EQ: return Success(LHSOffset == RHSOffset, E); 4332625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_NE: return Success(LHSOffset != RHSOffset, E); 4333ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman } 43343068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 43353068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 43362ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor if (!LHSTy->isIntegralOrEnumerationType() || 43372ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor !RHSTy->isIntegralOrEnumerationType()) { 4338e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // We can't continue from here for non-integral types. 4339e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 4340a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 4341a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4342a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman // The LHS of a constant expr is always evaluated and needed. 434347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue LHSVal; 4344745f5147e065900267c85a5568785a1991d4838fRichard Smith 4345745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateIntegerOrLValue(E->getLHS(), LHSVal, Info); 4346745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 4347f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4348d9f4bcda18bfbf79341edd9d381d4b6a3cffe655Eli Friedman 4349745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Visit(E->getRHS()) || !LHSOK) 435030c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return false; 4351745f5147e065900267c85a5568785a1991d4838fRichard Smith 435247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue &RHSVal = Result; 435342edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 435442edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman // Handle cases like (unsigned long)&a + 4. 4355c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isAdditiveOp() && LHSVal.isLValue() && RHSVal.isInt()) { 4356a73058324197b7bdfd19307965954f626e26199dKen Dyck CharUnits AdditionalOffset = CharUnits::fromQuantity( 4357a73058324197b7bdfd19307965954f626e26199dKen Dyck RHSVal.getInt().getZExtValue()); 43582de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Add) 435947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith LHSVal.getLValueOffset() += AdditionalOffset; 436042edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman else 436147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith LHSVal.getLValueOffset() -= AdditionalOffset; 436247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = LHSVal; 436342edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman return true; 436442edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman } 436542edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 436642edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman // Handle cases like 4 + (unsigned long)&a 43672de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Add && 4368c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RHSVal.isLValue() && LHSVal.isInt()) { 436947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith RHSVal.getLValueOffset() += CharUnits::fromQuantity( 437047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith LHSVal.getInt().getZExtValue()); 437147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith // Note that RHSVal is Result. 437242edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman return true; 437342edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman } 437442edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 437565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (E->getOpcode() == BO_Sub && LHSVal.isLValue() && RHSVal.isLValue()) { 437665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Handle (intptr_t)&&A - (intptr_t)&&B. 437765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSVal.getLValueOffset().isZero() || 437865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman !RHSVal.getLValueOffset().isZero()) 437965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 438065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *LHSExpr = LHSVal.getLValueBase().dyn_cast<const Expr*>(); 438165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *RHSExpr = RHSVal.getLValueBase().dyn_cast<const Expr*>(); 438265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSExpr || !RHSExpr) 438365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 438465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); 438565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); 438665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSAddrExpr || !RHSAddrExpr) 438765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 43885930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman // Make sure both labels come from the same function. 43895930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (LHSAddrExpr->getLabel()->getDeclContext() != 43905930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman RHSAddrExpr->getLabel()->getDeclContext()) 43915930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman return false; 439265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman Result = CCValue(LHSAddrExpr, RHSAddrExpr); 439365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return true; 439465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman } 439565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman 439642edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman // All the following cases expect both operands to be an integer 4397c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!LHSVal.isInt() || !RHSVal.isInt()) 4398f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4399a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4400c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith APSInt &LHS = LHSVal.getInt(); 4401c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith APSInt &RHS = RHSVal.getInt(); 440242edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 4403a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson switch (E->getOpcode()) { 440432fea9d18cc3658a1b01df5ca6f2ac302625c61dChris Lattner default: 4405f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4406c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_Mul: return Success(LHS * RHS, E); 4407c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_Add: return Success(LHS + RHS, E); 4408c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_Sub: return Success(LHS - RHS, E); 4409c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_And: return Success(LHS & RHS, E); 4410c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_Xor: return Success(LHS ^ RHS, E); 4411c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_Or: return Success(LHS | RHS, E); 44122de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 441354176fdb044312b4b77c3da6682d3575b3728d30Chris Lattner if (RHS == 0) 4414f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_expr_divide_by_zero); 4415c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Success(LHS / RHS, E); 44162de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Rem: 441754176fdb044312b4b77c3da6682d3575b3728d30Chris Lattner if (RHS == 0) 4418f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_expr_divide_by_zero); 4419c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Success(LHS % RHS, E); 44202de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shl: { 4421091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall // During constant-folding, a negative shift is an opposite shift. 4422091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall if (RHS.isSigned() && RHS.isNegative()) { 4423091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall RHS = -RHS; 4424091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall goto shift_right; 4425091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall } 4426091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall 4427091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall shift_left: 4428091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall unsigned SA 4429c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); 4430c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Success(LHS << SA, E); 44313f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 44322de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shr: { 4433091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall // During constant-folding, a negative shift is an opposite shift. 4434091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall if (RHS.isSigned() && RHS.isNegative()) { 4435091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall RHS = -RHS; 4436091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall goto shift_left; 4437091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall } 4438091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall 4439091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall shift_right: 44401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump unsigned SA = 4441c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); 4442c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Success(LHS >> SA, E); 44433f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 44441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4445c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_LT: return Success(LHS < RHS, E); 4446c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_GT: return Success(LHS > RHS, E); 4447c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_LE: return Success(LHS <= RHS, E); 4448c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_GE: return Success(LHS >= RHS, E); 4449c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_EQ: return Success(LHS == RHS, E); 4450c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_NE: return Success(LHS != RHS, E); 4451b11e77836dd0867955c5abf32baf1c3e6c7f81e1Eli Friedman } 4452a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 4453a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson 44548b752f10c394b140f9ef89e049cbad1a7676fc25Ken DyckCharUnits IntExprEvaluator::GetAlignOfType(QualType T) { 44555d484e8cf710207010720589d89602233de61d01Sebastian Redl // C++ [expr.sizeof]p2: "When applied to a reference or a reference type, 44565d484e8cf710207010720589d89602233de61d01Sebastian Redl // the result is the size of the referenced type." 44575d484e8cf710207010720589d89602233de61d01Sebastian Redl // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the 44585d484e8cf710207010720589d89602233de61d01Sebastian Redl // result shall be the alignment of the referenced type." 44595d484e8cf710207010720589d89602233de61d01Sebastian Redl if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 44605d484e8cf710207010720589d89602233de61d01Sebastian Redl T = Ref->getPointeeType(); 44619f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier 44629f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier // __alignof is defined to return the preferred alignment. 44639f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier return Info.Ctx.toCharUnitsFromBits( 44649f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier Info.Ctx.getPreferredTypeAlign(T.getTypePtr())); 4465e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner} 4466e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 44678b752f10c394b140f9ef89e049cbad1a7676fc25Ken DyckCharUnits IntExprEvaluator::GetAlignOfExpr(const Expr *E) { 4468af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner E = E->IgnoreParens(); 4469af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner 4470af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner // alignof decl is always accepted, even if it doesn't make sense: we default 44711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // to 1 in those cases. 4472af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) 44738b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck return Info.Ctx.getDeclAlign(DRE->getDecl(), 44748b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck /*RefAsPointee*/true); 4475a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4476af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) 44778b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck return Info.Ctx.getDeclAlign(ME->getMemberDecl(), 44788b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck /*RefAsPointee*/true); 4479af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner 4480e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner return GetAlignOfType(E->getType()); 4481e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner} 4482e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 4483e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 4484f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne/// VisitUnaryExprOrTypeTraitExpr - Evaluate a sizeof, alignof or vec_step with 4485f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne/// a result as the expression's type. 4486f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbournebool IntExprEvaluator::VisitUnaryExprOrTypeTraitExpr( 4487f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne const UnaryExprOrTypeTraitExpr *E) { 4488f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne switch(E->getKind()) { 4489f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_AlignOf: { 4490e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner if (E->isArgumentType()) 44914f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(GetAlignOfType(E->getArgumentType()), E); 4492e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner else 44934f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(GetAlignOfExpr(E->getArgumentExpr()), E); 4494e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner } 4495a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4496f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_VecStep: { 4497f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne QualType Ty = E->getTypeOfArgument(); 44980518999d3adcc289997bd974dce90cc97f5c1c44Sebastian Redl 4499f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (Ty->isVectorType()) { 4500f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne unsigned n = Ty->getAs<VectorType>()->getNumElements(); 4501a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4502f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // The vec_step built-in functions that take a 3-component 4503f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // vector return 4. (OpenCL 1.1 spec 6.11.12) 4504f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (n == 3) 4505f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne n = 4; 4506f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 4507f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return Success(n, E); 4508f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } else 4509f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return Success(1, E); 4510f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 4511f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 4512f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_SizeOf: { 4513f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne QualType SrcTy = E->getTypeOfArgument(); 4514f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // C++ [expr.sizeof]p2: "When applied to a reference or a reference type, 4515f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // the result is the size of the referenced type." 4516f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the 4517f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // result shall be the alignment of the referenced type." 4518f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (const ReferenceType *Ref = SrcTy->getAs<ReferenceType>()) 4519f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne SrcTy = Ref->getPointeeType(); 4520f2da9dfef96dc11b7b5effb1d02cb427b2d71599Eli Friedman 4521180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits Sizeof; 4522180f47959a066795cc0f409433023af448bb0328Richard Smith if (!HandleSizeof(Info, SrcTy, Sizeof)) 4523f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return false; 4524180f47959a066795cc0f409433023af448bb0328Richard Smith return Success(Sizeof, E); 4525f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 4526f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 4527f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 4528f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne llvm_unreachable("unknown expr/type trait"); 4529fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattner} 4530fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattner 45318cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitOffsetOfExpr(const OffsetOfExpr *OOE) { 45328ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CharUnits Result; 45338cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne unsigned n = OOE->getNumComponents(); 45348ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (n == 0) 4535f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 45368cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne QualType CurrentType = OOE->getTypeSourceInfo()->getType(); 45378ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor for (unsigned i = 0; i != n; ++i) { 45388ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor OffsetOfExpr::OffsetOfNode ON = OOE->getComponent(i); 45398ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor switch (ON.getKind()) { 45408ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Array: { 45418cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr *Idx = OOE->getIndexExpr(ON.getArrayExprIndex()); 45428ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor APSInt IdxResult; 45438ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (!EvaluateInteger(Idx, IdxResult, Info)) 45448ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor return false; 45458ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const ArrayType *AT = Info.Ctx.getAsArrayType(CurrentType); 45468ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (!AT) 4547f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 45488ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CurrentType = AT->getElementType(); 45498ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CharUnits ElementSize = Info.Ctx.getTypeSizeInChars(CurrentType); 45508ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor Result += IdxResult.getSExtValue() * ElementSize; 45518ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor break; 45528ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 4553f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 45548ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Field: { 45558ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor FieldDecl *MemberDecl = ON.getField(); 45568ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const RecordType *RT = CurrentType->getAs<RecordType>(); 4557f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!RT) 4558f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 45598ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor RecordDecl *RD = RT->getDecl(); 45608ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); 4561ba4f5d5754c8291690d01ca9581926673d69b24cJohn McCall unsigned i = MemberDecl->getFieldIndex(); 4562cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor assert(i < RL.getFieldCount() && "offsetof field in wrong type"); 4563fb1e3bc29b667f4275e1d5a43d64ec173f4f9a7dKen Dyck Result += Info.Ctx.toCharUnitsFromBits(RL.getFieldOffset(i)); 45648ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CurrentType = MemberDecl->getType().getNonReferenceType(); 45658ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor break; 45668ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 4567f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 45688ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Identifier: 45698ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor llvm_unreachable("dependent __builtin_offsetof"); 4570f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 4571cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor case OffsetOfExpr::OffsetOfNode::Base: { 4572cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor CXXBaseSpecifier *BaseSpec = ON.getBase(); 4573cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor if (BaseSpec->isVirtual()) 4574f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 4575cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 4576cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Find the layout of the class whose base we are looking into. 4577cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const RecordType *RT = CurrentType->getAs<RecordType>(); 4578f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!RT) 4579f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 4580cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor RecordDecl *RD = RT->getDecl(); 4581cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); 4582cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 4583cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Find the base class itself. 4584cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor CurrentType = BaseSpec->getType(); 4585cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const RecordType *BaseRT = CurrentType->getAs<RecordType>(); 4586cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor if (!BaseRT) 4587f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 4588cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 4589cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Add the offset to the base. 45907c7f820d70c925b29290a8563b59615816a827fcKen Dyck Result += RL.getBaseClassOffset(cast<CXXRecordDecl>(BaseRT->getDecl())); 4591cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor break; 4592cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor } 45938ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 45948ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 45958cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return Success(Result, OOE); 45968ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor} 45978ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor 4598b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattnerbool IntExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 459975a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner switch (E->getOpcode()) { 46004c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner default: 460175a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner // Address, indirect, pre/post inc/dec, etc are not valid constant exprs. 460275a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner // See C99 6.6p3. 4603f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 46042de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Extension: 46054c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // FIXME: Should extension allow i-c-e extension expressions in its scope? 46064c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // If so, we could clear the diagnostic ID. 4607f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Visit(E->getSubExpr()); 46082de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 4609c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // The result is just the value. 4610f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Visit(E->getSubExpr()); 4611f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_Minus: { 4612f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Visit(E->getSubExpr())) 4613f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4614f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Result.isInt()) return Error(E); 4615f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(-Result.getInt(), E); 4616f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 4617f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_Not: { 4618f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Visit(E->getSubExpr())) 4619f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4620f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Result.isInt()) return Error(E); 4621f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(~Result.getInt(), E); 4622f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 4623f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_LNot: { 4624f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool bres; 4625f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateAsBooleanCondition(E->getSubExpr(), bres, Info)) 4626f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4627f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(!bres, E); 4628f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 462906a3675627e3b3c47b49c689c8e404a33144194aAnders Carlsson } 4630a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 46311eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4632732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner/// HandleCast - This is used to evaluate implicit or explicit casts where the 4633732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner/// result type is integer. 46348cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitCastExpr(const CastExpr *E) { 46358cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr *SubExpr = E->getSubExpr(); 463682206e267ce6cc709797127616f64672d255b310Anders Carlsson QualType DestType = E->getType(); 4637b92dac8bc2f6f73919825f9af693a8a7e89ae1d4Daniel Dunbar QualType SrcType = SubExpr->getType(); 463882206e267ce6cc709797127616f64672d255b310Anders Carlsson 463946a523285928aa07bf14803178dc04616ac85994Eli Friedman switch (E->getCastKind()) { 464046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_BaseToDerived: 464146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_DerivedToBase: 464246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_UncheckedDerivedToBase: 464346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_Dynamic: 464446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ToUnion: 464546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ArrayToPointerDecay: 464646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FunctionToPointerDecay: 464746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NullToPointer: 464846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NullToMemberPointer: 464946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_BaseToDerivedMemberPointer: 465046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_DerivedToBaseMemberPointer: 465146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ConstructorConversion: 465246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToPointer: 465346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ToVoid: 465446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_VectorSplat: 465546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToFloating: 465646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingCast: 46571d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 46581d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 465946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_AnyPointerToBlockPointerCast: 466046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ObjCObjectLValueCast: 466146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingRealToComplex: 466246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToReal: 466346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexCast: 466446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToIntegralComplex: 466546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralRealToComplex: 466646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexCast: 466746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToFloatingComplex: 466846a523285928aa07bf14803178dc04616ac85994Eli Friedman llvm_unreachable("invalid cast kind for integral value"); 466946a523285928aa07bf14803178dc04616ac85994Eli Friedman 4670e50c297f92914ca996deb8b597624193273b62e4Eli Friedman case CK_BitCast: 467146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_Dependent: 467246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueBitCast: 467333e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 467433e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 467533e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 467633e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: 4677f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 467846a523285928aa07bf14803178dc04616ac85994Eli Friedman 46797d580a4e9e47dffc3c17aa2b957ac57ca3c4e451Richard Smith case CK_UserDefinedConversion: 468046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueToRValue: 46817a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 46827a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 468346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NoOp: 4684c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 468546a523285928aa07bf14803178dc04616ac85994Eli Friedman 468646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_MemberPointerToBoolean: 468746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_PointerToBoolean: 468846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToBoolean: 468946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingToBoolean: 469046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToBoolean: 469146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToBoolean: { 46924efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman bool BoolResult; 4693c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateAsBooleanCondition(SubExpr, BoolResult, Info)) 46944efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman return false; 4695131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(BoolResult, E); 46964efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 46974efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 469846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralCast: { 4699732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner if (!Visit(SubExpr)) 4700b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner return false; 4701a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 4702be26570e3faa009bdcefedfaf04473e518940520Eli Friedman if (!Result.isInt()) { 470365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Allow casts of address-of-label differences if they are no-ops 470465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // or narrowing. (The narrowing case isn't actually guaranteed to 470565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // be constant-evaluatable except in some narrow cases which are hard 470665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // to detect here. We let it through on the assumption the user knows 470765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // what they are doing.) 470865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (Result.isAddrLabelDiff()) 470965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return Info.Ctx.getTypeSize(DestType) <= Info.Ctx.getTypeSize(SrcType); 4710be26570e3faa009bdcefedfaf04473e518940520Eli Friedman // Only allow casts of lvalues if they are lossless. 4711be26570e3faa009bdcefedfaf04473e518940520Eli Friedman return Info.Ctx.getTypeSize(DestType) == Info.Ctx.getTypeSize(SrcType); 4712be26570e3faa009bdcefedfaf04473e518940520Eli Friedman } 471330c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar 4714f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith return Success(HandleIntToIntCast(Info, E, DestType, SrcType, 4715f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.getInt()), E); 4716732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner } 47171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 471846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_PointerToIntegral: { 4719c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 4720c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 4721efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 472287eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner if (!EvaluatePointer(SubExpr, LV, Info)) 4723b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner return false; 47244efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 4725dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar if (LV.getLValueBase()) { 4726dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar // Only allow based lvalue casts if they are lossless. 4727f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // FIXME: Allow a larger integer size than the pointer size, and allow 4728f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // narrowing back down to pointer width in subsequent integral casts. 4729f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // FIXME: Check integer type's active bits, not its type size. 4730dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar if (Info.Ctx.getTypeSize(DestType) != Info.Ctx.getTypeSize(SrcType)) 4731f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4732dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar 4733b755a9da095d2f2f04444797f1e1a9511693815bRichard Smith LV.Designator.setInvalid(); 4734efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LV.moveInto(Result); 4735dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar return true; 4736dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar } 47374efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 4738a73058324197b7bdfd19307965954f626e26199dKen Dyck APSInt AsInt = Info.Ctx.MakeIntValue(LV.getLValueOffset().getQuantity(), 4739a73058324197b7bdfd19307965954f626e26199dKen Dyck SrcType); 4740f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith return Success(HandleIntToIntCast(Info, E, DestType, SrcType, AsInt), E); 47412bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson } 47424efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 474346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToReal: { 4744f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue C; 47451725f683432715e5afe34d476024bd6f16eac3fcEli Friedman if (!EvaluateComplex(SubExpr, C, Info)) 47461725f683432715e5afe34d476024bd6f16eac3fcEli Friedman return false; 474746a523285928aa07bf14803178dc04616ac85994Eli Friedman return Success(C.getComplexIntReal(), E); 47481725f683432715e5afe34d476024bd6f16eac3fcEli Friedman } 47492217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman 475046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingToIntegral: { 475146a523285928aa07bf14803178dc04616ac85994Eli Friedman APFloat F(0.0); 475246a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateFloat(SubExpr, F, Info)) 475346a523285928aa07bf14803178dc04616ac85994Eli Friedman return false; 4754732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner 4755c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APSInt Value; 4756c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!HandleFloatToIntCast(Info, E, SrcType, F, DestType, Value)) 4757c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 4758c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return Success(Value, E); 475946a523285928aa07bf14803178dc04616ac85994Eli Friedman } 476046a523285928aa07bf14803178dc04616ac85994Eli Friedman } 47611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 476246a523285928aa07bf14803178dc04616ac85994Eli Friedman llvm_unreachable("unknown cast resulting in integral value"); 4763a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 47642bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 4765722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedmanbool IntExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 4766722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 4767f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LV; 4768f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateComplex(E->getSubExpr(), LV, Info)) 4769f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4770f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LV.isComplexInt()) 4771f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4772722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Success(LV.getComplexIntReal(), E); 4773722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman } 4774722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 4775722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Visit(E->getSubExpr()); 4776722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman} 4777722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 4778664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedmanbool IntExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 4779722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman if (E->getSubExpr()->getType()->isComplexIntegerType()) { 4780f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LV; 4781f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateComplex(E->getSubExpr(), LV, Info)) 4782f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4783f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LV.isComplexInt()) 4784f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4785722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Success(LV.getComplexIntImag(), E); 4786722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman } 4787722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 47888327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 4789664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman return Success(0, E); 4790664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman} 4791664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 4792ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregorbool IntExprEvaluator::VisitSizeOfPackExpr(const SizeOfPackExpr *E) { 4793ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor return Success(E->getPackLength(), E); 4794ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor} 4795ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor 4796295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redlbool IntExprEvaluator::VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) { 4797295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl return Success(E->getValue(), E); 4798295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl} 4799295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl 4800f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 4801d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman// Float Evaluation 4802d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman//===----------------------------------------------------------------------===// 4803d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 4804d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmannamespace { 4805770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass FloatExprEvaluator 48068cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<FloatExprEvaluator, bool> { 4807d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman APFloat &Result; 4808d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanpublic: 4809d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman FloatExprEvaluator(EvalInfo &info, APFloat &result) 48108cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(result) {} 4811d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 481247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith bool Success(const CCValue &V, const Expr *e) { 48138cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result = V.getFloat(); 48148cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 48158cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 4816d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 481751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 4818f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith Result = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(E->getType())); 4819f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith return true; 4820f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 4821f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 4822019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner bool VisitCallExpr(const CallExpr *E); 4823d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 48245db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar bool VisitUnaryOperator(const UnaryOperator *E); 4825d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman bool VisitBinaryOperator(const BinaryOperator *E); 4826d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman bool VisitFloatingLiteral(const FloatingLiteral *E); 48278cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E); 48282217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman 4829abd3a857ace59100305790545d1baae5877b8945John McCall bool VisitUnaryReal(const UnaryOperator *E); 4830abd3a857ace59100305790545d1baae5877b8945John McCall bool VisitUnaryImag(const UnaryOperator *E); 4831ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman 483251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // FIXME: Missing: array subscript of vector, member of vector 4833d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman}; 4834d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} // end anonymous namespace 4835d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 4836d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanstatic bool EvaluateFloat(const Expr* E, APFloat& Result, EvalInfo &Info) { 4837c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isRealFloatingType()); 48388cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return FloatExprEvaluator(Info, Result).Visit(E); 4839d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 4840d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 48414ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadstatic bool TryEvaluateBuiltinNaN(const ASTContext &Context, 4842db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall QualType ResultTy, 4843db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const Expr *Arg, 4844db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall bool SNaN, 4845db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall llvm::APFloat &Result) { 4846db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const StringLiteral *S = dyn_cast<StringLiteral>(Arg->IgnoreParenCasts()); 4847db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (!S) return false; 4848db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 4849db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const llvm::fltSemantics &Sem = Context.getFloatTypeSemantics(ResultTy); 4850db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 4851db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall llvm::APInt fill; 4852db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 4853db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall // Treat empty strings as if they were zero. 4854db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (S->getString().empty()) 4855db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall fill = llvm::APInt(32, 0); 4856db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall else if (S->getString().getAsInteger(0, fill)) 4857db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall return false; 4858db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 4859db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (SNaN) 4860db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall Result = llvm::APFloat::getSNaN(Sem, false, &fill); 4861db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall else 4862db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall Result = llvm::APFloat::getQNaN(Sem, false, &fill); 4863db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall return true; 4864db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall} 4865db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 4866019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattnerbool FloatExprEvaluator::VisitCallExpr(const CallExpr *E) { 4867180f47959a066795cc0f409433023af448bb0328Richard Smith switch (E->isBuiltinCall()) { 48688cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne default: 48698cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 48708cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 4871019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_val: 4872019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_valf: 4873019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_vall: 4874019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_inf: 4875019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_inff: 48767cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar case Builtin::BI__builtin_infl: { 48777cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar const llvm::fltSemantics &Sem = 48787cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar Info.Ctx.getFloatTypeSemantics(E->getType()); 487934a74ab81600a40c6324fd76adb724b803dfaf91Chris Lattner Result = llvm::APFloat::getInf(Sem); 488034a74ab81600a40c6324fd76adb724b803dfaf91Chris Lattner return true; 48817cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar } 48821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4883db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nans: 4884db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nansf: 4885db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nansl: 4886f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), 4887f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith true, Result)) 4888f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4889f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 4890db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 48919e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nan: 48929e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nanf: 48939e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nanl: 48944572baba9d18c275968ac113fd73b0e3c77cccb8Mike Stump // If this is __builtin_nan() turn this into a nan, otherwise we 48959e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner // can't constant fold it. 4896f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), 4897f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith false, Result)) 4898f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4899f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 49005db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar 49015db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabs: 49025db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabsf: 49035db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabsl: 49045db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (!EvaluateFloat(E->getArg(0), Result, Info)) 49055db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return false; 49061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 49075db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (Result.isNegative()) 49085db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.changeSign(); 49095db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 49105db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar 49111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Builtin::BI__builtin_copysign: 49121eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Builtin::BI__builtin_copysignf: 49135db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_copysignl: { 49145db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar APFloat RHS(0.); 49155db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (!EvaluateFloat(E->getArg(0), Result, Info) || 49165db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar !EvaluateFloat(E->getArg(1), RHS, Info)) 49175db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return false; 49185db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.copySign(RHS); 49195db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 49205db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar } 4921019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner } 4922019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner} 4923019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner 4924abd3a857ace59100305790545d1baae5877b8945John McCallbool FloatExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 492543efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 492643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman ComplexValue CV; 492743efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (!EvaluateComplex(E->getSubExpr(), CV, Info)) 492843efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return false; 492943efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = CV.FloatReal; 493043efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return true; 493143efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman } 493243efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman 493343efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return Visit(E->getSubExpr()); 4934abd3a857ace59100305790545d1baae5877b8945John McCall} 4935abd3a857ace59100305790545d1baae5877b8945John McCall 4936abd3a857ace59100305790545d1baae5877b8945John McCallbool FloatExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 493743efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 493843efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman ComplexValue CV; 493943efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (!EvaluateComplex(E->getSubExpr(), CV, Info)) 494043efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return false; 494143efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = CV.FloatImag; 494243efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return true; 494343efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman } 494443efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman 49458327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 494643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(E->getType()); 494743efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = llvm::APFloat::getZero(Sem); 4948abd3a857ace59100305790545d1baae5877b8945John McCall return true; 4949abd3a857ace59100305790545d1baae5877b8945John McCall} 4950abd3a857ace59100305790545d1baae5877b8945John McCall 49515db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbarbool FloatExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 49525db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar switch (E->getOpcode()) { 4953f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 49542de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 49557993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith return EvaluateFloat(E->getSubExpr(), Result, Info); 49562de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Minus: 49577993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith if (!EvaluateFloat(E->getSubExpr(), Result, Info)) 49587993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith return false; 49595db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.changeSign(); 49605db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 49615db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar } 49625db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar} 4963019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner 4964d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanbool FloatExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 4965e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) 4966e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 496796e93660124c8028a4c3bcc038ab0cdd18cd7ab2Anders Carlsson 49685db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar APFloat RHS(0.0); 4969745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateFloat(E->getLHS(), Result, Info); 4970745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 4971d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return false; 4972745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateFloat(E->getRHS(), RHS, Info) || !LHSOK) 4973d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return false; 4974d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 4975d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman switch (E->getOpcode()) { 4976f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 49772de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 4978d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.multiply(RHS, APFloat::rmNearestTiesToEven); 4979d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return true; 49802de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 4981d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.add(RHS, APFloat::rmNearestTiesToEven); 4982d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return true; 49832de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 4984d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.subtract(RHS, APFloat::rmNearestTiesToEven); 4985d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return true; 49862de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 4987d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.divide(RHS, APFloat::rmNearestTiesToEven); 4988d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return true; 4989d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman } 4990d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 4991d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 4992d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanbool FloatExprEvaluator::VisitFloatingLiteral(const FloatingLiteral *E) { 4993d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result = E->getValue(); 4994d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return true; 4995d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 4996d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 49978cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool FloatExprEvaluator::VisitCastExpr(const CastExpr *E) { 49988cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 49991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 50002a523eec6a31955be876625819b89e8dc5def707Eli Friedman switch (E->getCastKind()) { 50012a523eec6a31955be876625819b89e8dc5def707Eli Friedman default: 5002c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 50032a523eec6a31955be876625819b89e8dc5def707Eli Friedman 50042a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_IntegralToFloating: { 50054efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman APSInt IntResult; 5006c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return EvaluateInteger(SubExpr, IntResult, Info) && 5007c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleIntToFloatCast(Info, E, SubExpr->getType(), IntResult, 5008c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith E->getType(), Result); 50094efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 50102a523eec6a31955be876625819b89e8dc5def707Eli Friedman 50112a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_FloatingCast: { 50124efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman if (!Visit(SubExpr)) 50134efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman return false; 5014c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToFloatCast(Info, E, SubExpr->getType(), E->getType(), 5015c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result); 50164efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 5017f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall 50182a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_FloatingComplexToReal: { 5019f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall ComplexValue V; 5020f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall if (!EvaluateComplex(SubExpr, V, Info)) 5021f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall return false; 5022f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall Result = V.getComplexFloatReal(); 5023f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall return true; 5024f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall } 50252a523eec6a31955be876625819b89e8dc5def707Eli Friedman } 50264efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 50274efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5028d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman//===----------------------------------------------------------------------===// 5029a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar// Complex Evaluation (for float and integer) 50309ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson//===----------------------------------------------------------------------===// 50319ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 50329ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlssonnamespace { 5033770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass ComplexExprEvaluator 50348cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<ComplexExprEvaluator, bool> { 5035f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue &Result; 50361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 50379ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlssonpublic: 5038f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexExprEvaluator(EvalInfo &info, ComplexValue &Result) 50398cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(Result) {} 50401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 504147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith bool Success(const CCValue &V, const Expr *e) { 50428cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result.setFrom(V); 50438cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 50448cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 50451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 50467ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman bool ZeroInitialization(const Expr *E); 50477ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 50488cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 50498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne // Visitor Methods 50508cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 50519ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 50528cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitImaginaryLiteral(const ImaginaryLiteral *E); 50538cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E); 5054b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman bool VisitBinaryOperator(const BinaryOperator *E); 505596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara bool VisitUnaryOperator(const UnaryOperator *E); 50567ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman bool VisitInitListExpr(const InitListExpr *E); 5057b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman}; 5058b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} // end anonymous namespace 50591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5060b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedmanstatic bool EvaluateComplex(const Expr *E, ComplexValue &Result, 5061b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman EvalInfo &Info) { 5062c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isAnyComplexType()); 50638cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ComplexExprEvaluator(Info, Result).Visit(E); 5064b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} 5065b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 50667ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedmanbool ComplexExprEvaluator::ZeroInitialization(const Expr *E) { 5067f6c17a439f3320ac620639a3ee66dbdabb93810cEli Friedman QualType ElemTy = E->getType()->getAs<ComplexType>()->getElementType(); 50687ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (ElemTy->isRealFloatingType()) { 50697ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexFloat(); 50707ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman APFloat Zero = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(ElemTy)); 50717ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.FloatReal = Zero; 50727ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.FloatImag = Zero; 50737ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } else { 50747ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexInt(); 50757ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman APSInt Zero = Info.Ctx.MakeIntValue(0, ElemTy); 50767ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.IntReal = Zero; 50777ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.IntImag = Zero; 50787ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 50797ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return true; 50807ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman} 50817ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 50828cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool ComplexExprEvaluator::VisitImaginaryLiteral(const ImaginaryLiteral *E) { 50838cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 5084b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5085b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (SubExpr->getType()->isRealFloatingType()) { 5086b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.makeComplexFloat(); 5087b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APFloat &Imag = Result.FloatImag; 5088b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (!EvaluateFloat(SubExpr, Imag, Info)) 5089b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5090b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5091b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.FloatReal = APFloat(Imag.getSemantics()); 5092b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return true; 5093b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman } else { 5094b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman assert(SubExpr->getType()->isIntegerType() && 5095b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman "Unexpected imaginary literal."); 5096b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5097b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.makeComplexInt(); 5098b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APSInt &Imag = Result.IntImag; 5099b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (!EvaluateInteger(SubExpr, Imag, Info)) 5100b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5101b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5102b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.IntReal = APSInt(Imag.getBitWidth(), !Imag.isSigned()); 5103b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return true; 5104b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman } 5105b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} 5106b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 51078cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool ComplexExprEvaluator::VisitCastExpr(const CastExpr *E) { 5108b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 51098786da77984e81d48e0e1b2bd339809b1efc19f3John McCall switch (E->getCastKind()) { 51108786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BitCast: 51118786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BaseToDerived: 51128786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_DerivedToBase: 51138786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_UncheckedDerivedToBase: 51148786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_Dynamic: 51158786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ToUnion: 51168786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ArrayToPointerDecay: 51178786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FunctionToPointerDecay: 51188786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NullToPointer: 51198786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NullToMemberPointer: 51208786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BaseToDerivedMemberPointer: 51218786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_DerivedToBaseMemberPointer: 51228786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_MemberPointerToBoolean: 51238786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ConstructorConversion: 51248786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToPointer: 51258786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_PointerToIntegral: 51268786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_PointerToBoolean: 51278786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ToVoid: 51288786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_VectorSplat: 51298786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralCast: 51308786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToBoolean: 51318786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToFloating: 51328786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingToIntegral: 51338786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingToBoolean: 51348786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingCast: 51351d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 51361d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 51378786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_AnyPointerToBlockPointerCast: 51388786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ObjCObjectLValueCast: 51398786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToReal: 51408786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToBoolean: 51418786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToReal: 51428786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToBoolean: 514333e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 514433e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 514533e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 514633e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: 51478786da77984e81d48e0e1b2bd339809b1efc19f3John McCall llvm_unreachable("invalid cast kind for complex value"); 51488786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 51498786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_LValueToRValue: 51507a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 51517a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 51528786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NoOp: 5153c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 51542bb5d00fcf71a7b4d478d478be778fff0494aff6John McCall 51558786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_Dependent: 515646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueBitCast: 51578786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_UserDefinedConversion: 5158f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 51598786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 51608786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingRealToComplex: { 5161b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APFloat &Real = Result.FloatReal; 51628786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!EvaluateFloat(E->getSubExpr(), Real, Info)) 5163b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5164b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 51658786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexFloat(); 51668786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.FloatImag = APFloat(Real.getSemantics()); 51678786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 51688786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 51698786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 51708786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexCast: { 51718786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 51728786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 51738786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 51748786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 51758786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 51768786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 51778786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 5178c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToFloatCast(Info, E, From, To, Result.FloatReal) && 5179c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleFloatToFloatCast(Info, E, From, To, Result.FloatImag); 51808786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 51818786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 51828786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToIntegralComplex: { 51838786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 51848786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 51858786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 51868786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 51878786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 51888786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 51898786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexInt(); 5190c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToIntCast(Info, E, From, Result.FloatReal, 5191c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.IntReal) && 5192c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleFloatToIntCast(Info, E, From, Result.FloatImag, 5193c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.IntImag); 51948786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 51958786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 51968786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralRealToComplex: { 5197b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APSInt &Real = Result.IntReal; 51988786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!EvaluateInteger(E->getSubExpr(), Real, Info)) 5199b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 52009ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 52018786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexInt(); 52028786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.IntImag = APSInt(Real.getBitWidth(), !Real.isSigned()); 52038786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 52048786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 52058786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 52068786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexCast: { 52078786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 5208b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5209ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 52108786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 52118786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 52128786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 52131725f683432715e5afe34d476024bd6f16eac3fcEli Friedman 5214f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.IntReal = HandleIntToIntCast(Info, E, To, From, Result.IntReal); 5215f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.IntImag = HandleIntToIntCast(Info, E, To, From, Result.IntImag); 52168786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 52178786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 52188786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 52198786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToFloatingComplex: { 52208786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 52218786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 52228786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 52238786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 52248786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 52258786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 52268786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexFloat(); 5227c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleIntToFloatCast(Info, E, From, Result.IntReal, 5228c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.FloatReal) && 5229c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleIntToFloatCast(Info, E, From, Result.IntImag, 5230c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.FloatImag); 52318786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 5232ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson } 52331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 52348786da77984e81d48e0e1b2bd339809b1efc19f3John McCall llvm_unreachable("unknown cast resulting in complex value"); 52359ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson} 52369ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 5237f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCallbool ComplexExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 5238e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) 52392ad226bdc847df6b6b6e4f832856478ab63bb3dcRichard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 52402ad226bdc847df6b6b6e4f832856478ab63bb3dcRichard Smith 5241745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = Visit(E->getLHS()); 5242745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 5243f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return false; 52441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5245f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue RHS; 5246745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK) 5247f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return false; 5248a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar 52493f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar assert(Result.isComplexFloat() == RHS.isComplexFloat() && 52503f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar "Invalid operands to binary operator."); 5251ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson switch (E->getOpcode()) { 5252f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 52532de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 5254a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar if (Result.isComplexFloat()) { 5255a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatReal().add(RHS.getComplexFloatReal(), 5256a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5257a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatImag().add(RHS.getComplexFloatImag(), 5258a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5259a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } else { 5260a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntReal() += RHS.getComplexIntReal(); 5261a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntImag() += RHS.getComplexIntImag(); 5262a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } 52633f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 52642de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 5265a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar if (Result.isComplexFloat()) { 5266a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatReal().subtract(RHS.getComplexFloatReal(), 5267a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5268a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatImag().subtract(RHS.getComplexFloatImag(), 5269a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5270a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } else { 5271a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntReal() -= RHS.getComplexIntReal(); 5272a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntImag() -= RHS.getComplexIntImag(); 5273a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } 52743f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 52752de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 52763f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar if (Result.isComplexFloat()) { 5277f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS = Result; 52783f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &LHS_r = LHS.getComplexFloatReal(); 52793f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &LHS_i = LHS.getComplexFloatImag(); 52803f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &RHS_r = RHS.getComplexFloatReal(); 52813f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &RHS_i = RHS.getComplexFloatImag(); 52821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 52833f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat Tmp = LHS_r; 52843f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_r, APFloat::rmNearestTiesToEven); 52853f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatReal() = Tmp; 52863f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_i; 52873f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 52883f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatReal().subtract(Tmp, APFloat::rmNearestTiesToEven); 52893f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar 52903f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_r; 52913f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 52923f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatImag() = Tmp; 52933f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_i; 52943f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_r, APFloat::rmNearestTiesToEven); 52953f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatImag().add(Tmp, APFloat::rmNearestTiesToEven); 52963f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar } else { 5297f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS = Result; 52981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Result.getComplexIntReal() = 52993f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar (LHS.getComplexIntReal() * RHS.getComplexIntReal() - 53003f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar LHS.getComplexIntImag() * RHS.getComplexIntImag()); 53011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Result.getComplexIntImag() = 53023f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar (LHS.getComplexIntReal() * RHS.getComplexIntImag() + 53033f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar LHS.getComplexIntImag() * RHS.getComplexIntReal()); 53043f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar } 53053f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 530696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case BO_Div: 530796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) { 530896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara ComplexValue LHS = Result; 530996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &LHS_r = LHS.getComplexFloatReal(); 531096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &LHS_i = LHS.getComplexFloatImag(); 531196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &RHS_r = RHS.getComplexFloatReal(); 531296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &RHS_i = RHS.getComplexFloatImag(); 531396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &Res_r = Result.getComplexFloatReal(); 531496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &Res_i = Result.getComplexFloatImag(); 531596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 531696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat Den = RHS_r; 531796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Den.multiply(RHS_r, APFloat::rmNearestTiesToEven); 531896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat Tmp = RHS_i; 531996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 532096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Den.add(Tmp, APFloat::rmNearestTiesToEven); 532196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 532296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r = LHS_r; 532396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.multiply(RHS_r, APFloat::rmNearestTiesToEven); 532496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp = LHS_i; 532596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 532696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.add(Tmp, APFloat::rmNearestTiesToEven); 532796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.divide(Den, APFloat::rmNearestTiesToEven); 532896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 532996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i = LHS_i; 533096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.multiply(RHS_r, APFloat::rmNearestTiesToEven); 533196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp = LHS_r; 533296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 533396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.subtract(Tmp, APFloat::rmNearestTiesToEven); 533496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.divide(Den, APFloat::rmNearestTiesToEven); 533596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } else { 5336f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (RHS.getComplexIntReal() == 0 && RHS.getComplexIntImag() == 0) 5337f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_expr_divide_by_zero); 5338f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 533996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara ComplexValue LHS = Result; 534096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APSInt Den = RHS.getComplexIntReal() * RHS.getComplexIntReal() + 534196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara RHS.getComplexIntImag() * RHS.getComplexIntImag(); 534296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntReal() = 534396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara (LHS.getComplexIntReal() * RHS.getComplexIntReal() + 534496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara LHS.getComplexIntImag() * RHS.getComplexIntImag()) / Den; 534596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = 534696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara (LHS.getComplexIntImag() * RHS.getComplexIntReal() - 534796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara LHS.getComplexIntReal() * RHS.getComplexIntImag()) / Den; 534896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 534996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara break; 5350ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson } 5351ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 5352f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return true; 5353ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson} 5354ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 535596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnarabool ComplexExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 535696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara // Get the operand value into 'Result'. 535796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (!Visit(E->getSubExpr())) 535896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return false; 535996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 536096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara switch (E->getOpcode()) { 536196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara default: 5362f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 536396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Extension: 536496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 536596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Plus: 536696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara // The result is always just the subexpr. 536796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 536896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Minus: 536996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) { 537096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatReal().changeSign(); 537196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatImag().changeSign(); 537296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 537396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara else { 537496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntReal() = -Result.getComplexIntReal(); 537596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = -Result.getComplexIntImag(); 537696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 537796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 537896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Not: 537996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) 538096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatImag().changeSign(); 538196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara else 538296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = -Result.getComplexIntImag(); 538396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 538496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 538596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara} 538696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 53877ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedmanbool ComplexExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 53887ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (E->getNumInits() == 2) { 53897ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (E->getType()->isComplexType()) { 53907ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexFloat(); 53917ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateFloat(E->getInit(0), Result.FloatReal, Info)) 53927ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 53937ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateFloat(E->getInit(1), Result.FloatImag, Info)) 53947ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 53957ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } else { 53967ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexInt(); 53977ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateInteger(E->getInit(0), Result.IntReal, Info)) 53987ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 53997ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateInteger(E->getInit(1), Result.IntImag, Info)) 54007ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 54017ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 54027ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return true; 54037ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 54047ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return ExprEvaluatorBaseTy::VisitInitListExpr(E); 54057ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman} 54067ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 54079ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson//===----------------------------------------------------------------------===// 5408aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith// Void expression evaluation, primarily for a cast to void on the LHS of a 5409aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith// comma operator 5410aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith//===----------------------------------------------------------------------===// 5411aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5412aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithnamespace { 5413aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithclass VoidExprEvaluator 5414aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith : public ExprEvaluatorBase<VoidExprEvaluator, bool> { 5415aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithpublic: 5416aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith VoidExprEvaluator(EvalInfo &Info) : ExprEvaluatorBaseTy(Info) {} 5417aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5418aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith bool Success(const CCValue &V, const Expr *e) { return true; } 5419aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5420aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith bool VisitCastExpr(const CastExpr *E) { 5421aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith switch (E->getCastKind()) { 5422aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith default: 5423aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 5424aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith case CK_ToVoid: 5425aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith VisitIgnoredValue(E->getSubExpr()); 5426aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return true; 5427aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } 5428aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } 5429aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith}; 5430aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith} // end anonymous namespace 5431aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5432aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithstatic bool EvaluateVoid(const Expr *E, EvalInfo &Info) { 5433aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith assert(E->isRValue() && E->getType()->isVoidType()); 5434aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return VoidExprEvaluator(Info).Visit(E); 5435aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith} 5436aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5437aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith//===----------------------------------------------------------------------===// 543851f4708c00110940ca3f337961915f2ca1668375Richard Smith// Top level Expr::EvaluateAsRValue method. 5439f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 5440f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 544147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smithstatic bool Evaluate(CCValue &Result, EvalInfo &Info, const Expr *E) { 5442c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C, function designators are not lvalues, but we evaluate them as if they 5443c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // are. 5444c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isGLValue() || E->getType()->isFunctionType()) { 5445c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LValue LV; 5446c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateLValue(E, LV, Info)) 5447c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 5448c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LV.moveInto(Result); 5449c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } else if (E->getType()->isVectorType()) { 54501e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!EvaluateVector(E, Result, Info)) 545159b5da6d853b4368b984700315adf7b37de05764Nate Begeman return false; 5452575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor } else if (E->getType()->isIntegralOrEnumerationType()) { 54531e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!IntExprEvaluator(Info, Result).Visit(E)) 54546dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 5455efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->hasPointerRepresentation()) { 5456efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 5457efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluatePointer(E, LV, Info)) 54586dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 54591e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith LV.moveInto(Result); 5460efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->isRealFloatingType()) { 5461efdb83e26f9a1fd2566afe54461216cd84814d42John McCall llvm::APFloat F(0.0); 5462efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateFloat(E, F, Info)) 54636dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 546447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = CCValue(F); 5465efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->isAnyComplexType()) { 5466efdb83e26f9a1fd2566afe54461216cd84814d42John McCall ComplexValue C; 5467efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateComplex(E, C, Info)) 5468660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return false; 54691e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith C.moveInto(Result); 547069c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith } else if (E->getType()->isMemberPointerType()) { 5471e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr P; 5472e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateMemberPointer(E, P, Info)) 5473e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 5474e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith P.moveInto(Result); 5475e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 547651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } else if (E->getType()->isArrayType()) { 5477180f47959a066795cc0f409433023af448bb0328Richard Smith LValue LV; 54781bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith LV.set(E, Info.CurrentCall); 5479180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArray(E, LV, Info.CurrentCall->Temporaries[E], Info)) 5480cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 5481180f47959a066795cc0f409433023af448bb0328Richard Smith Result = Info.CurrentCall->Temporaries[E]; 548251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } else if (E->getType()->isRecordType()) { 5483180f47959a066795cc0f409433023af448bb0328Richard Smith LValue LV; 54841bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith LV.set(E, Info.CurrentCall); 5485180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateRecord(E, LV, Info.CurrentCall->Temporaries[E], Info)) 5486180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 5487180f47959a066795cc0f409433023af448bb0328Richard Smith Result = Info.CurrentCall->Temporaries[E]; 5488aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } else if (E->getType()->isVoidType()) { 5489c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) 5490c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_nonliteral) 5491c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << E->getType(); 5492c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith else 5493c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 5494aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith if (!EvaluateVoid(E, Info)) 5495aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return false; 5496c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else if (Info.getLangOpts().CPlusPlus0x) { 5497c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_nonliteral) << E->getType(); 5498c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 5499f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } else { 5500dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 5501660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return false; 5502f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5503660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump 5504660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return true; 5505660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump} 5506660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump 550769c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith/// EvaluateConstantExpression - Evaluate an expression as a constant expression 550869c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith/// in-place in an APValue. In some cases, the in-place evaluation is essential, 550969c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith/// since later initializers for an object can indirectly refer to subobjects 551069c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith/// which were initialized earlier. 551169c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smithstatic bool EvaluateConstantExpression(APValue &Result, EvalInfo &Info, 5512c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const LValue &This, const Expr *E, 5513c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CheckConstantExpressionKind CCEK) { 551451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!CheckLiteralType(Info, E)) 551551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 551651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 551751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (E->isRValue()) { 551869c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // Evaluate arrays and record types in-place, so that later initializers can 551969c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // refer to earlier-initialized members of the object. 5520180f47959a066795cc0f409433023af448bb0328Richard Smith if (E->getType()->isArrayType()) 5521180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateArray(E, This, Result, Info); 5522180f47959a066795cc0f409433023af448bb0328Richard Smith else if (E->getType()->isRecordType()) 5523180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateRecord(E, This, Result, Info); 552469c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith } 552569c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 552669c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // For any other type, in-place evaluation is unimportant. 552769c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith CCValue CoreConstResult; 552869c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return Evaluate(CoreConstResult, Info, E) && 5529c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CheckConstantExpression(Info, E, CoreConstResult, Result, CCEK); 553069c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith} 553169c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 5532f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// EvaluateAsRValue - Try to evaluate this expression, performing an implicit 5533f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// lvalue-to-rvalue cast if it is an lvalue. 5534f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateAsRValue(EvalInfo &Info, const Expr *E, APValue &Result) { 553551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!CheckLiteralType(Info, E)) 553651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 553751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 5538f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith CCValue Value; 5539f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!::Evaluate(Value, Info, E)) 5540f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5541f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 5542f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (E->isGLValue()) { 5543f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith LValue LV; 5544f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith LV.setFrom(Value); 5545f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), LV, Value)) 5546f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5547f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5548f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 5549f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // Check this core constant expression is a constant expression, and if so, 5550f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // convert it to one. 5551f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return CheckConstantExpression(Info, E, Value, Result); 5552f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 5553c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 555451f4708c00110940ca3f337961915f2ca1668375Richard Smith/// EvaluateAsRValue - Return true if this is a constant which we can fold using 555556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall/// any crazy technique (that has nothing to do with language standards) that 555656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall/// we want to. If this function returns true, it returns the folded constant 5557c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// in Result. If this expression is a glvalue, an lvalue-to-rvalue conversion 5558c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// will be applied to the result. 555951f4708c00110940ca3f337961915f2ca1668375Richard Smithbool Expr::EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const { 5560ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith // Fast-path evaluations of integer literals, since we sometimes see files 5561ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith // containing vast quantities of these. 5562ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith if (const IntegerLiteral *L = dyn_cast<IntegerLiteral>(this)) { 5563ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith Result.Val = APValue(APSInt(L->getValue(), 5564ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith L->getType()->isUnsignedIntegerType())); 5565ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith return true; 5566ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith } 5567ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith 55682d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // FIXME: Evaluating values of large array and record types can cause 55692d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // performance problems. Only do so in C++11 for now. 5570e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isRValue() && (getType()->isArrayType() || getType()->isRecordType()) && 5571e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith !Ctx.getLangOptions().CPlusPlus0x) 55721445bbacf4c8de5f208ff4ccb302424a4d9e233eRichard Smith return false; 55731445bbacf4c8de5f208ff4ccb302424a4d9e233eRichard Smith 5574f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith EvalInfo Info(Ctx, Result); 5575f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ::EvaluateAsRValue(Info, this, Result.Val); 557656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall} 557756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 55784ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::EvaluateAsBooleanCondition(bool &Result, 55794ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foad const ASTContext &Ctx) const { 5580c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalResult Scratch; 558151f4708c00110940ca3f337961915f2ca1668375Richard Smith return EvaluateAsRValue(Scratch, Ctx) && 5582b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleConversionToBool(CCValue(const_cast<ASTContext&>(Ctx), 5583b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Scratch.Val, CCValue::GlobalValue()), 558447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result); 5585cd7a445c6b46c5585580dfb652300c8483c0cb6bJohn McCall} 5586cd7a445c6b46c5585580dfb652300c8483c0cb6bJohn McCall 558780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithbool Expr::EvaluateAsInt(APSInt &Result, const ASTContext &Ctx, 558880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith SideEffectsKind AllowSideEffects) const { 558980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!getType()->isIntegralOrEnumerationType()) 559080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 559180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 5592c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalResult ExprResult; 559380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!EvaluateAsRValue(ExprResult, Ctx) || !ExprResult.Val.isInt() || 559480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith (!AllowSideEffects && ExprResult.HasSideEffects)) 5595c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 5596f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 5597c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = ExprResult.Val.getInt(); 5598c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return true; 5599a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith} 5600a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith 56014ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const { 56021b78276a75a5a0f496a82429c1ff9604d622a76dAnders Carlsson EvalInfo Info(Ctx, Result); 56031b78276a75a5a0f496a82429c1ff9604d622a76dAnders Carlsson 5604efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 56059a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith return EvaluateLValue(this, LV, Info) && !Result.HasSideEffects && 5606c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CheckLValueConstantExpression(Info, this, LV, Result.Val, 5607c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_Constant); 5608b2f295c8050fb8c141bf2cf38eed0a56e99d0092Eli Friedman} 5609b2f295c8050fb8c141bf2cf38eed0a56e99d0092Eli Friedman 5610099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithbool Expr::EvaluateAsInitializer(APValue &Value, const ASTContext &Ctx, 5611099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const VarDecl *VD, 5612099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith llvm::SmallVectorImpl<PartialDiagnosticAt> &Notes) const { 56132d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // FIXME: Evaluating initializers for large array and record types can cause 56142d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // performance problems. Only do so in C++11 for now. 56152d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith if (isRValue() && (getType()->isArrayType() || getType()->isRecordType()) && 56162d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith !Ctx.getLangOptions().CPlusPlus0x) 56172d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith return false; 56182d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith 5619099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Expr::EvalStatus EStatus; 5620099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EStatus.Diag = &Notes; 5621099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 5622099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EvalInfo InitInfo(Ctx, EStatus); 5623099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith InitInfo.setEvaluatingDecl(VD, Value); 5624099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 562551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!CheckLiteralType(InitInfo, this)) 562651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 562751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 5628099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith LValue LVal; 5629099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith LVal.set(VD); 5630099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 563151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // C++11 [basic.start.init]p2: 563251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Variables with static storage duration or thread storage duration shall be 563351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // zero-initialized before any other initialization takes place. 563451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // This behavior is not present in C. 563551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (Ctx.getLangOptions().CPlusPlus && !VD->hasLocalStorage() && 563651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith !VD->getType()->isReferenceType()) { 563751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(VD->getType()); 563851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!EvaluateConstantExpression(Value, InitInfo, LVal, &VIE)) 563951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 564051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 564151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 5642099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return EvaluateConstantExpression(Value, InitInfo, LVal, this) && 5643099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith !EStatus.HasSideEffects; 5644099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith} 5645099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 564651f4708c00110940ca3f337961915f2ca1668375Richard Smith/// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 564751f4708c00110940ca3f337961915f2ca1668375Richard Smith/// constant folded, but discard the result. 56484ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::isEvaluatable(const ASTContext &Ctx) const { 56494fdfb0965b396f2778091f7e6c051d17ff9791baAnders Carlsson EvalResult Result; 565051f4708c00110940ca3f337961915f2ca1668375Richard Smith return EvaluateAsRValue(Result, Ctx) && !Result.HasSideEffects; 565145b6b9d080ac56917337d73d8f1cd6374b27b05dChris Lattner} 565251fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson 56534ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::HasSideEffects(const ASTContext &Ctx) const { 56541e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith return HasSideEffect(Ctx).Visit(this); 5655393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian} 5656393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian 5657a6b8b2c09610b8bc4330e948ece8b940c2386406Richard SmithAPSInt Expr::EvaluateKnownConstInt(const ASTContext &Ctx) const { 56581c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson EvalResult EvalResult; 565951f4708c00110940ca3f337961915f2ca1668375Richard Smith bool Result = EvaluateAsRValue(EvalResult, Ctx); 5660c6ed729f669044f5072a49d79041f455d971ece3Jeffrey Yasskin (void)Result; 566151fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson assert(Result && "Could not evaluate expression"); 56621c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson assert(EvalResult.Val.isInt() && "Expression did not evaluate to integer"); 566351fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson 56641c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson return EvalResult.Val.getInt(); 566551fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson} 5666d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5667e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara bool Expr::EvalResult::isGlobalLValue() const { 5668e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara assert(Val.isLValue()); 5669e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara return IsGlobalLValue(Val.getLValueBase()); 5670e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara } 5671e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara 5672e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara 5673d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// isIntegerConstantExpr - this recursive routine will test if an expression is 5674d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// an integer constant expression. 5675d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5676d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 5677d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// comma, etc 5678d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// 5679d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof 5680d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer 5681d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// cast+dereference. 5682d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5683d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// CheckICE - This function does the fundamental ICE checking: the returned 5684d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation. 5685d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// Note that to reduce code duplication, this helper does no evaluation 5686d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// itself; the caller checks whether the expression is evaluatable, and 5687d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// in the rare cases where CheckICE actually cares about the evaluated 5688d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// value, it calls into Evalute. 5689d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 5690d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// Meanings of Val: 569151f4708c00110940ca3f337961915f2ca1668375Richard Smith// 0: This expression is an ICE. 5692d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 1: This expression is not an ICE, but if it isn't evaluated, it's 5693d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// a legal subexpression for an ICE. This return value is used to handle 5694d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// the comma operator in C99 mode. 5695d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 2: This expression is not an ICE, and is not a legal subexpression for one. 5696d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 56973c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmannamespace { 56983c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 5699d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstruct ICEDiag { 5700d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall unsigned Val; 5701d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall SourceLocation Loc; 5702d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5703d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall public: 5704d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {} 5705d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag() : Val(0) {} 5706d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall}; 5707d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 57083c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman} 57093c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 57103c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmanstatic ICEDiag NoDiag() { return ICEDiag(); } 5711d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5712d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstatic ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) { 5713d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall Expr::EvalResult EVResult; 571451f4708c00110940ca3f337961915f2ca1668375Richard Smith if (!E->EvaluateAsRValue(EVResult, Ctx) || EVResult.HasSideEffects || 5715d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall !EVResult.Val.isInt()) { 5716d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 5717d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5718d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 5719d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 5720d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5721d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstatic ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) { 5722d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall assert(!E->isValueDependent() && "Should not see value dependent exprs!"); 57232ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor if (!E->getType()->isIntegralOrEnumerationType()) { 5724d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 5725d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5726d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5727d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (E->getStmtClass()) { 572863c00d7f35fa060c0a446c9df3a4402d9c7757feJohn McCall#define ABSTRACT_STMT(Node) 5729d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#define STMT(Node, Base) case Expr::Node##Class: 5730d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#define EXPR(Node, Base) 5731d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#include "clang/AST/StmtNodes.inc" 5732d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::PredefinedExprClass: 5733d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::FloatingLiteralClass: 5734d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImaginaryLiteralClass: 5735d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::StringLiteralClass: 5736d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ArraySubscriptExprClass: 5737d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::MemberExprClass: 5738d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CompoundAssignOperatorClass: 5739d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CompoundLiteralExprClass: 5740d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ExtVectorElementExprClass: 5741d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DesignatedInitExprClass: 5742d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImplicitValueInitExprClass: 5743d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ParenListExprClass: 5744d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::VAArgExprClass: 5745d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::AddrLabelExprClass: 5746d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::StmtExprClass: 5747d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXMemberCallExprClass: 5748e08ce650a2b02410eddd1f60a4aa6b3d4be71e73Peter Collingbourne case Expr::CUDAKernelCallExprClass: 5749d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDynamicCastExprClass: 5750d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXTypeidExprClass: 57519be88403e965cc49af76c9d33d818781d44b333eFrancois Pichet case Expr::CXXUuidofExprClass: 5752d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXNullPtrLiteralExprClass: 5753d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXThisExprClass: 5754d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXThrowExprClass: 5755d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXNewExprClass: 5756d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDeleteExprClass: 5757d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXPseudoDestructorExprClass: 5758d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnresolvedLookupExprClass: 5759d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DependentScopeDeclRefExprClass: 5760d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXConstructExprClass: 5761d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXBindTemporaryExprClass: 57624765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall case Expr::ExprWithCleanupsClass: 5763d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXTemporaryObjectExprClass: 5764d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXUnresolvedConstructExprClass: 5765d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDependentScopeMemberExprClass: 5766d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnresolvedMemberExprClass: 5767d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCStringLiteralClass: 5768d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCEncodeExprClass: 5769d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCMessageExprClass: 5770d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCSelectorExprClass: 5771d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCProtocolExprClass: 5772d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCIvarRefExprClass: 5773d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCPropertyRefExprClass: 5774d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCIsaExprClass: 5775d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ShuffleVectorExprClass: 5776d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BlockExprClass: 5777d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BlockDeclRefExprClass: 5778d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::NoStmtClass: 57797cd7d1ad33fdf49eef83942e8855fe20d95aa1b9John McCall case Expr::OpaqueValueExprClass: 5780be230c36e32142cbdcdbe9c97511d097beeecbabDouglas Gregor case Expr::PackExpansionExprClass: 5781c7793c73ba8a343de3f2552d984851985a46f159Douglas Gregor case Expr::SubstNonTypeTemplateParmPackExprClass: 578261eee0ca33b29e102f11bab77c8b74cc00e2392bTanya Lattner case Expr::AsTypeExprClass: 5783f85e193739c953358c865005855253af4f68a497John McCall case Expr::ObjCIndirectCopyRestoreExprClass: 578403e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor case Expr::MaterializeTemporaryExprClass: 57854b9c2d235fb9449e249d74f48ecfec601650de93John McCall case Expr::PseudoObjectExprClass: 5786276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Expr::AtomicExprClass: 5787cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl case Expr::InitListExprClass: 5788cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl return ICEDiag(2, E->getLocStart()); 5789cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 5790ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor case Expr::SizeOfPackExprClass: 5791d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::GNUNullExprClass: 5792d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // GCC considers the GNU __null value to be an integral constant expression. 5793d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 5794d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 579591a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall case Expr::SubstNonTypeTemplateParmExprClass: 579691a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall return 579791a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall CheckICE(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement(), Ctx); 579891a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall 5799d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ParenExprClass: 5800d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); 5801f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne case Expr::GenericSelectionExprClass: 5802f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne return CheckICE(cast<GenericSelectionExpr>(E)->getResultExpr(), Ctx); 5803d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::IntegerLiteralClass: 5804d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CharacterLiteralClass: 5805d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXBoolLiteralExprClass: 5806ed8abf18329df67b0abcbb3a10458bd8c1d2a595Douglas Gregor case Expr::CXXScalarValueInitExprClass: 5807d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnaryTypeTraitExprClass: 58086ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet case Expr::BinaryTypeTraitExprClass: 580921ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley case Expr::ArrayTypeTraitExprClass: 5810552622067dc45013d240f73952fece703f5e63bdJohn Wiegley case Expr::ExpressionTraitExprClass: 58112e156225a29407a50dd19041aa5750171ad44ea3Sebastian Redl case Expr::CXXNoexceptExprClass: 5812d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 5813d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CallExprClass: 58146cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt case Expr::CXXOperatorCallExprClass: { 581505830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows function calls within unevaluated subexpressions of 581605830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // constant expressions, but they can never be ICEs because an ICE cannot 581705830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // contain an operand of (pointer to) function type. 5818d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const CallExpr *CE = cast<CallExpr>(E); 5819180f47959a066795cc0f409433023af448bb0328Richard Smith if (CE->isBuiltinCall()) 5820d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckEvalInICE(E, Ctx); 5821d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 5822d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5823d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DeclRefExprClass: 5824d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) 5825d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 582603f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith if (Ctx.getLangOptions().CPlusPlus && IsConstNonVolatile(E->getType())) { 5827d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const NamedDecl *D = cast<DeclRefExpr>(E)->getDecl(); 5828d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5829d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Parameter variables are never constants. Without this check, 5830d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // getAnyInitializer() can find a default argument, which leads 5831d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // to chaos. 5832d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (isa<ParmVarDecl>(D)) 5833d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 5834d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5835d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // C++ 7.1.5.1p2 5836d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // A variable of non-volatile const-qualified integral or enumeration 5837d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // type initialized by an ICE can be used in ICEs. 5838d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (const VarDecl *Dcl = dyn_cast<VarDecl>(D)) { 5839db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith if (!Dcl->getType()->isIntegralOrEnumerationType()) 5840db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 5841db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith 5842099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const VarDecl *VD; 5843099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Look for a declaration of this variable that has an initializer, and 5844099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // check whether it is an ICE. 5845099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (Dcl->getAnyInitializer(VD) && VD->checkInitIsICE()) 5846099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return NoDiag(); 5847099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith else 5848099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 5849d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5850d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5851d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 5852d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnaryOperatorClass: { 5853d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const UnaryOperator *Exp = cast<UnaryOperator>(E); 5854d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (Exp->getOpcode()) { 58552de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PostInc: 58562de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PostDec: 58572de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PreInc: 58582de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PreDec: 58592de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_AddrOf: 58602de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Deref: 586105830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows increment and decrement within unevaluated 586205830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // subexpressions of constant expressions, but they can never be ICEs 586305830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // because an ICE cannot contain an lvalue operand. 5864d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 58652de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Extension: 58662de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_LNot: 58672de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 58682de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Minus: 58692de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Not: 58702de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Real: 58712de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Imag: 5872d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(Exp->getSubExpr(), Ctx); 5873d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5874d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5875d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // OffsetOf falls through here. 5876d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5877d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::OffsetOfExprClass: { 5878d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Note that per C99, offsetof must be an ICE. And AFAIK, using 587951f4708c00110940ca3f337961915f2ca1668375Richard Smith // EvaluateAsRValue matches the proposed gcc behavior for cases like 588005830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // "offsetof(struct s{int x[4];}, x[1.0])". This doesn't affect 5881d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // compliance: we should warn earlier for offsetof expressions with 5882d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // array subscripts that aren't ICEs, and if the array subscripts 5883d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // are ICEs, the value of the offsetof must be an integer constant. 5884d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckEvalInICE(E, Ctx); 5885d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5886f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case Expr::UnaryExprOrTypeTraitExprClass: { 5887f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne const UnaryExprOrTypeTraitExpr *Exp = cast<UnaryExprOrTypeTraitExpr>(E); 5888f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if ((Exp->getKind() == UETT_SizeOf) && 5889f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne Exp->getTypeOfArgument()->isVariableArrayType()) 5890d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 5891d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 5892d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5893d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BinaryOperatorClass: { 5894d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const BinaryOperator *Exp = cast<BinaryOperator>(E); 5895d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (Exp->getOpcode()) { 58962de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_PtrMemD: 58972de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_PtrMemI: 58982de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Assign: 58992de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_MulAssign: 59002de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_DivAssign: 59012de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_RemAssign: 59022de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_AddAssign: 59032de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_SubAssign: 59042de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_ShlAssign: 59052de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_ShrAssign: 59062de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_AndAssign: 59072de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_XorAssign: 59082de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_OrAssign: 590905830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows assignments within unevaluated subexpressions of 591005830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // constant expressions, but they can never be ICEs because an ICE cannot 591105830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // contain an lvalue operand. 5912d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 5913d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 59142de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 59152de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 59162de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Rem: 59172de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 59182de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 59192de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shl: 59202de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shr: 59212de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LT: 59222de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GT: 59232de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LE: 59242de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GE: 59252de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_EQ: 59262de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_NE: 59272de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_And: 59282de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Xor: 59292de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Or: 59302de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Comma: { 5931d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 5932d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 59332de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (Exp->getOpcode() == BO_Div || 59342de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall Exp->getOpcode() == BO_Rem) { 593551f4708c00110940ca3f337961915f2ca1668375Richard Smith // EvaluateAsRValue gives an error for undefined Div/Rem, so make sure 5936d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // we don't evaluate one. 59373b332ab132fa85c83833d74d400f6e126f52fbd2John McCall if (LHSResult.Val == 0 && RHSResult.Val == 0) { 5938a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt REval = Exp->getRHS()->EvaluateKnownConstInt(Ctx); 5939d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (REval == 0) 5940d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 5941d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (REval.isSigned() && REval.isAllOnesValue()) { 5942a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt LEval = Exp->getLHS()->EvaluateKnownConstInt(Ctx); 5943d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LEval.isMinSignedValue()) 5944d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 5945d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5946d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5947d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 59482de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (Exp->getOpcode() == BO_Comma) { 5949d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (Ctx.getLangOptions().C99) { 5950d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // C99 6.6p3 introduces a strange edge case: comma can be in an ICE 5951d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // if it isn't evaluated. 5952d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val == 0 && RHSResult.Val == 0) 5953d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 5954d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } else { 5955d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // In both C89 and C++, commas in ICEs are illegal. 5956d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 5957d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5958d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5959d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val >= RHSResult.Val) 5960d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return LHSResult; 5961d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 5962d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 59632de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LAnd: 59642de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LOr: { 5965d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 5966d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 5967d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val == 0 && RHSResult.Val == 1) { 5968d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Rare case where the RHS has a comma "side-effect"; we need 5969d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // to actually check the condition to see whether the side 5970d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // with the comma is evaluated. 59712de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if ((Exp->getOpcode() == BO_LAnd) != 5972a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith (Exp->getLHS()->EvaluateKnownConstInt(Ctx) == 0)) 5973d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 5974d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 5975d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5976d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5977d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val >= RHSResult.Val) 5978d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return LHSResult; 5979d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 5980d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5981d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5982d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5983d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImplicitCastExprClass: 5984d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CStyleCastExprClass: 5985d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXFunctionalCastExprClass: 5986d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXStaticCastExprClass: 5987d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXReinterpretCastExprClass: 598832cb47174304bc7ec11478b9497c4e10f48273d9Richard Smith case Expr::CXXConstCastExprClass: 5989f85e193739c953358c865005855253af4f68a497John McCall case Expr::ObjCBridgedCastExprClass: { 5990d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); 59912116b144cf07f2574d20517187eb8863645376ebRichard Smith if (isa<ExplicitCastExpr>(E)) { 59922116b144cf07f2574d20517187eb8863645376ebRichard Smith if (const FloatingLiteral *FL 59932116b144cf07f2574d20517187eb8863645376ebRichard Smith = dyn_cast<FloatingLiteral>(SubExpr->IgnoreParenImpCasts())) { 59942116b144cf07f2574d20517187eb8863645376ebRichard Smith unsigned DestWidth = Ctx.getIntWidth(E->getType()); 59952116b144cf07f2574d20517187eb8863645376ebRichard Smith bool DestSigned = E->getType()->isSignedIntegerOrEnumerationType(); 59962116b144cf07f2574d20517187eb8863645376ebRichard Smith APSInt IgnoredVal(DestWidth, !DestSigned); 59972116b144cf07f2574d20517187eb8863645376ebRichard Smith bool Ignored; 59982116b144cf07f2574d20517187eb8863645376ebRichard Smith // If the value does not fit in the destination type, the behavior is 59992116b144cf07f2574d20517187eb8863645376ebRichard Smith // undefined, so we are not required to treat it as a constant 60002116b144cf07f2574d20517187eb8863645376ebRichard Smith // expression. 60012116b144cf07f2574d20517187eb8863645376ebRichard Smith if (FL->getValue().convertToInteger(IgnoredVal, 60022116b144cf07f2574d20517187eb8863645376ebRichard Smith llvm::APFloat::rmTowardZero, 60032116b144cf07f2574d20517187eb8863645376ebRichard Smith &Ignored) & APFloat::opInvalidOp) 60042116b144cf07f2574d20517187eb8863645376ebRichard Smith return ICEDiag(2, E->getLocStart()); 60052116b144cf07f2574d20517187eb8863645376ebRichard Smith return NoDiag(); 60062116b144cf07f2574d20517187eb8863645376ebRichard Smith } 60072116b144cf07f2574d20517187eb8863645376ebRichard Smith } 6008eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman switch (cast<CastExpr>(E)->getCastKind()) { 6009eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_LValueToRValue: 60107a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 60117a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 6012eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_NoOp: 6013eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_IntegralToBoolean: 6014eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_IntegralCast: 6015d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(SubExpr, Ctx); 6016eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman default: 6017eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman return ICEDiag(2, E->getLocStart()); 6018eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman } 6019d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 602056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall case Expr::BinaryConditionalOperatorClass: { 602156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall const BinaryConditionalOperator *Exp = cast<BinaryConditionalOperator>(E); 602256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ICEDiag CommonResult = CheckICE(Exp->getCommon(), Ctx); 602356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (CommonResult.Val == 2) return CommonResult; 602456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 602556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (FalseResult.Val == 2) return FalseResult; 602656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (CommonResult.Val == 1) return CommonResult; 602756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (FalseResult.Val == 1 && 6028a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith Exp->getCommon()->EvaluateKnownConstInt(Ctx) == 0) return NoDiag(); 602956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall return FalseResult; 603056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 6031d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ConditionalOperatorClass: { 6032d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const ConditionalOperator *Exp = cast<ConditionalOperator>(E); 6033d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // If the condition (ignoring parens) is a __builtin_constant_p call, 6034d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // then only the true side is actually considered in an integer constant 6035d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // expression, and it is fully evaluated. This is an important GNU 6036d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // extension. See GCC PR38377 for discussion. 6037d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (const CallExpr *CallCE 6038d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) 603980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (CallCE->isBuiltinCall() == Builtin::BI__builtin_constant_p) 604080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return CheckEvalInICE(E, Ctx); 6041d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); 6042d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (CondResult.Val == 2) 6043d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CondResult; 604463fe6814f339df30b8463b39995947cbdf920e48Douglas Gregor 6045f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); 6046f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 604763fe6814f339df30b8463b39995947cbdf920e48Douglas Gregor 6048d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (TrueResult.Val == 2) 6049d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return TrueResult; 6050d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (FalseResult.Val == 2) 6051d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return FalseResult; 6052d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (CondResult.Val == 1) 6053d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CondResult; 6054d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (TrueResult.Val == 0 && FalseResult.Val == 0) 6055d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6056d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Rare case where the diagnostics depend on which side is evaluated 6057d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Note that if we get here, CondResult is 0, and at least one of 6058d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // TrueResult and FalseResult is non-zero. 6059a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith if (Exp->getCond()->EvaluateKnownConstInt(Ctx) == 0) { 6060d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return FalseResult; 6061d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6062d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return TrueResult; 6063d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6064d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDefaultArgExprClass: 6065d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); 6066d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ChooseExprClass: { 6067d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx); 6068d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6069d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6070d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 60713026348bd4c13a0f83b59839f64065e0fcbea253David Blaikie llvm_unreachable("Invalid StmtClass!"); 6072d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 6073d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6074f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Evaluate an expression as a C++11 integral constant expression. 6075f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateCPlusPlus11IntegralConstantExpr(ASTContext &Ctx, 6076f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const Expr *E, 6077f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith llvm::APSInt *Value, 6078f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith SourceLocation *Loc) { 6079f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!E->getType()->isIntegralOrEnumerationType()) { 6080f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Loc) *Loc = E->getExprLoc(); 6081f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6082f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 6083f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 60844c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith APValue Result; 60854c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!E->isCXX11ConstantExpr(Ctx, &Result, Loc)) 6086dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return false; 6087dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 60884c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith assert(Result.isInt() && "pointer cast to int is not an ICE"); 60894c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Value) *Value = Result.getInt(); 6090dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return true; 6091f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6092f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6093dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smithbool Expr::isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc) const { 6094f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Ctx.getLangOptions().CPlusPlus0x) 6095f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, 0, Loc); 6096f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6097d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag d = CheckICE(this, Ctx); 6098d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (d.Val != 0) { 6099d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (Loc) *Loc = d.Loc; 6100d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return false; 6101d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6102f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 6103f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6104f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6105f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithbool Expr::isIntegerConstantExpr(llvm::APSInt &Value, ASTContext &Ctx, 6106f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith SourceLocation *Loc, bool isEvaluated) const { 6107f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Ctx.getLangOptions().CPlusPlus0x) 6108f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, &Value, Loc); 6109f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6110f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!isIntegerConstantExpr(Ctx, Loc)) 6111f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6112f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateAsInt(Value, Ctx)) 6113d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall llvm_unreachable("ICE cannot be evaluated!"); 6114d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return true; 6115d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 61164c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 61174c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smithbool Expr::isCXX11ConstantExpr(ASTContext &Ctx, APValue *Result, 61184c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith SourceLocation *Loc) const { 61194c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // We support this checking in C++98 mode in order to diagnose compatibility 61204c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // issues. 61214c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith assert(Ctx.getLangOptions().CPlusPlus); 61224c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 61234c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Expr::EvalStatus Status; 61244c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 61254c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Status.Diag = &Diags; 61264c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith EvalInfo Info(Ctx, Status); 61274c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 61284c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith APValue Scratch; 61294c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith bool IsConstExpr = ::EvaluateAsRValue(Info, this, Result ? *Result : Scratch); 61304c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 61314c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!Diags.empty()) { 61324c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith IsConstExpr = false; 61334c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Loc) *Loc = Diags[0].first; 61344c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith } else if (!IsConstExpr) { 61354c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // FIXME: This shouldn't happen. 61364c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Loc) *Loc = getExprLoc(); 61374c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith } 61384c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 61394c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith return IsConstExpr; 61404c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith} 6141745f5147e065900267c85a5568785a1991d4838fRichard Smith 6142745f5147e065900267c85a5568785a1991d4838fRichard Smithbool Expr::isPotentialConstantExpr(const FunctionDecl *FD, 6143745f5147e065900267c85a5568785a1991d4838fRichard Smith llvm::SmallVectorImpl< 6144745f5147e065900267c85a5568785a1991d4838fRichard Smith PartialDiagnosticAt> &Diags) { 6145745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: It would be useful to check constexpr function templates, but at the 6146745f5147e065900267c85a5568785a1991d4838fRichard Smith // moment the constant expression evaluator cannot cope with the non-rigorous 6147745f5147e065900267c85a5568785a1991d4838fRichard Smith // ASTs which we build for dependent expressions. 6148745f5147e065900267c85a5568785a1991d4838fRichard Smith if (FD->isDependentContext()) 6149745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 6150745f5147e065900267c85a5568785a1991d4838fRichard Smith 6151745f5147e065900267c85a5568785a1991d4838fRichard Smith Expr::EvalStatus Status; 6152745f5147e065900267c85a5568785a1991d4838fRichard Smith Status.Diag = &Diags; 6153745f5147e065900267c85a5568785a1991d4838fRichard Smith 6154745f5147e065900267c85a5568785a1991d4838fRichard Smith EvalInfo Info(FD->getASTContext(), Status); 6155745f5147e065900267c85a5568785a1991d4838fRichard Smith Info.CheckingPotentialConstantExpression = true; 6156745f5147e065900267c85a5568785a1991d4838fRichard Smith 6157745f5147e065900267c85a5568785a1991d4838fRichard Smith const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 6158745f5147e065900267c85a5568785a1991d4838fRichard Smith const CXXRecordDecl *RD = MD ? MD->getParent()->getCanonicalDecl() : 0; 6159745f5147e065900267c85a5568785a1991d4838fRichard Smith 6160745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: Fabricate an arbitrary expression on the stack and pretend that it 6161745f5147e065900267c85a5568785a1991d4838fRichard Smith // is a temporary being used as the 'this' pointer. 6162745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue This; 6163745f5147e065900267c85a5568785a1991d4838fRichard Smith ImplicitValueInitExpr VIE(RD ? Info.Ctx.getRecordType(RD) : Info.Ctx.IntTy); 6164745f5147e065900267c85a5568785a1991d4838fRichard Smith This.set(&VIE, Info.CurrentCall); 6165745f5147e065900267c85a5568785a1991d4838fRichard Smith 6166745f5147e065900267c85a5568785a1991d4838fRichard Smith APValue Scratch; 6167745f5147e065900267c85a5568785a1991d4838fRichard Smith ArrayRef<const Expr*> Args; 6168745f5147e065900267c85a5568785a1991d4838fRichard Smith 6169745f5147e065900267c85a5568785a1991d4838fRichard Smith SourceLocation Loc = FD->getLocation(); 6170745f5147e065900267c85a5568785a1991d4838fRichard Smith 6171745f5147e065900267c85a5568785a1991d4838fRichard Smith if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) { 6172745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleConstructorCall(Loc, This, Args, CD, Info, Scratch); 6173745f5147e065900267c85a5568785a1991d4838fRichard Smith } else 6174745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleFunctionCall(Loc, FD, (MD && MD->isInstance()) ? &This : 0, 6175745f5147e065900267c85a5568785a1991d4838fRichard Smith Args, FD->getBody(), Info, Scratch); 6176745f5147e065900267c85a5568785a1991d4838fRichard Smith 6177745f5147e065900267c85a5568785a1991d4838fRichard Smith return Diags.empty(); 6178745f5147e065900267c85a5568785a1991d4838fRichard Smith} 6179