ExprConstant.cpp revision 4c3fc9b38d3723f73e4ded594cebf38c76f91d93
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// 12c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson//===----------------------------------------------------------------------===// 13c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson 14c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson#include "clang/AST/APValue.h" 15c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson#include "clang/AST/ASTContext.h" 16199c3d6cd16aebbb9c7f0d42af9d922c9628bf70Ken Dyck#include "clang/AST/CharUnits.h" 1719cc4abea06a9b49e0e16a50d335c064cd723572Anders Carlsson#include "clang/AST/RecordLayout.h" 180fe52e1bcaa69ba127f1bda036f057fec1f478deSeo Sanghyeon#include "clang/AST/StmtVisitor.h" 198ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor#include "clang/AST/TypeLoc.h" 20500d3297d2a21edeac4d46cbcbe21bc2352c2a28Chris Lattner#include "clang/AST/ASTDiagnostic.h" 218ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor#include "clang/AST/Expr.h" 221b63e4f732dbc73d90abf886b4d21f8e3a165f6dChris Lattner#include "clang/Basic/Builtins.h" 2306a3675627e3b3c47b49c689c8e404a33144194aAnders Carlsson#include "clang/Basic/TargetInfo.h" 247462b39a9bccaf4392687831036713f09f9c0681Mike Stump#include "llvm/ADT/SmallString.h" 254572baba9d18c275968ac113fd73b0e3c77cccb8Mike Stump#include <cstring> 264572baba9d18c275968ac113fd73b0e3c77cccb8Mike Stump 27c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlssonusing namespace clang; 28f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnerusing llvm::APSInt; 29d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanusing llvm::APFloat; 30c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson 3187eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// EvalInfo - This is a private struct used by the evaluator to capture 3287eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// information about a subexpression as it is folded. It retains information 3387eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// about the AST context, but also maintains information about the folded 3487eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// expression. 3587eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// 3687eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// If an expression could be evaluated, it is still possible it is not a C 3787eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// "integer constant expression" or constant expression. If not, this struct 3887eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// captures information about how and why not. 3987eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// 4087eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// One bit of information passed *into* the request for constant folding 4187eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// indicates whether the subexpression is "evaluated" or not according to C 4287eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// rules. For example, the RHS of (0 && foo()) is not evaluated. We can 4387eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// evaluate the expression regardless of what the RHS is, but C only allows 4487eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner/// certain things in certain situations. 45c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramernamespace { 46180f47959a066795cc0f409433023af448bb0328Richard Smith struct LValue; 47d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith struct CallStackFrame; 48bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith struct EvalInfo; 49d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 501bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType getType(APValue::LValueBase B) { 511bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!B) return QualType(); 521bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) 531bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return D->getType(); 541bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return B.get<const Expr*>()->getType(); 551bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith } 561bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith 57180f47959a066795cc0f409433023af448bb0328Richard Smith /// Get an LValue path entry, which is known to not be an array index, as a 58180f47959a066795cc0f409433023af448bb0328Richard Smith /// field declaration. 59180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *getAsField(APValue::LValuePathEntry E) { 60180f47959a066795cc0f409433023af448bb0328Richard Smith APValue::BaseOrMemberType Value; 61180f47959a066795cc0f409433023af448bb0328Richard Smith Value.setFromOpaqueValue(E.BaseOrMember); 62180f47959a066795cc0f409433023af448bb0328Richard Smith return dyn_cast<FieldDecl>(Value.getPointer()); 63180f47959a066795cc0f409433023af448bb0328Richard Smith } 64180f47959a066795cc0f409433023af448bb0328Richard Smith /// Get an LValue path entry, which is known to not be an array index, as a 65180f47959a066795cc0f409433023af448bb0328Richard Smith /// base class declaration. 66180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *getAsBaseClass(APValue::LValuePathEntry E) { 67180f47959a066795cc0f409433023af448bb0328Richard Smith APValue::BaseOrMemberType Value; 68180f47959a066795cc0f409433023af448bb0328Richard Smith Value.setFromOpaqueValue(E.BaseOrMember); 69180f47959a066795cc0f409433023af448bb0328Richard Smith return dyn_cast<CXXRecordDecl>(Value.getPointer()); 70180f47959a066795cc0f409433023af448bb0328Richard Smith } 71180f47959a066795cc0f409433023af448bb0328Richard Smith /// Determine whether this LValue path entry for a base class names a virtual 72180f47959a066795cc0f409433023af448bb0328Richard Smith /// base class. 73180f47959a066795cc0f409433023af448bb0328Richard Smith bool isVirtualBaseClass(APValue::LValuePathEntry E) { 74180f47959a066795cc0f409433023af448bb0328Richard Smith APValue::BaseOrMemberType Value; 75180f47959a066795cc0f409433023af448bb0328Richard Smith Value.setFromOpaqueValue(E.BaseOrMember); 76180f47959a066795cc0f409433023af448bb0328Richard Smith return Value.getInt(); 77180f47959a066795cc0f409433023af448bb0328Richard Smith } 78180f47959a066795cc0f409433023af448bb0328Richard Smith 79b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Find the path length and type of the most-derived subobject in the given 80b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// path, and find the size of the containing array, if any. 81b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith static 82b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned findMostDerivedSubobject(ASTContext &Ctx, QualType Base, 83b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArrayRef<APValue::LValuePathEntry> Path, 84b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith uint64_t &ArraySize, QualType &Type) { 85b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned MostDerivedLength = 0; 86b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Type = Base; 879a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith for (unsigned I = 0, N = Path.size(); I != N; ++I) { 88b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Type->isArrayType()) { 89b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const ConstantArrayType *CAT = 90b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith cast<ConstantArrayType>(Ctx.getAsArrayType(Type)); 91b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Type = CAT->getElementType(); 92b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArraySize = CAT->getSize().getZExtValue(); 93b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedLength = I + 1; 94b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } else if (const FieldDecl *FD = getAsField(Path[I])) { 95b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Type = FD->getType(); 96b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArraySize = 0; 97b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedLength = I + 1; 98b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } else { 999a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith // Path[I] describes a base class. 100b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArraySize = 0; 101b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1029a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 103b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return MostDerivedLength; 1049a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 1059a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 106b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // The order of this enum is important for diagnostics. 107b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith enum CheckSubobjectKind { 108b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CSK_Base, CSK_Derived, CSK_Field, CSK_ArrayToPointer, CSK_ArrayIndex 109b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith }; 110b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1110a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// A path from a glvalue to a subobject of that glvalue. 1120a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith struct SubobjectDesignator { 1130a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// True if the subobject was named in a manner not supported by C++11. Such 1140a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// lvalues can still be folded, but they are not core constant expressions 1150a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// and we cannot perform lvalue-to-rvalue conversions on them. 1160a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith bool Invalid : 1; 1170a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 118b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Is this a pointer one past the end of an object? 119b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool IsOnePastTheEnd : 1; 120b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 121b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// The length of the path to the most-derived object of which this is a 122b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// subobject. 123b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned MostDerivedPathLength : 30; 124b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 125b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// The size of the array of which the most-derived object is an element, or 126b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// 0 if the most-derived object is not an array element. 127b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith uint64_t MostDerivedArraySize; 1280a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 129b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// The type of the most derived object referred to by this address. 130b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith QualType MostDerivedType; 1310a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 1329a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith typedef APValue::LValuePathEntry PathEntry; 1339a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 1340a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// The entries on the path from the glvalue to the designated subobject. 1350a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SmallVector<PathEntry, 8> Entries; 1360a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 137b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator() : Invalid(true) {} 1380a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 139b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith explicit SubobjectDesignator(QualType T) 140b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith : Invalid(false), IsOnePastTheEnd(false), MostDerivedPathLength(0), 141b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedArraySize(0), MostDerivedType(T) {} 142b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 143b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator(ASTContext &Ctx, const APValue &V) 144b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith : Invalid(!V.isLValue() || !V.hasLValuePath()), IsOnePastTheEnd(false), 145b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength(0), MostDerivedArraySize(0) { 1469a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (!Invalid) { 147b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith IsOnePastTheEnd = V.isLValueOnePastTheEnd(); 1489a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith ArrayRef<PathEntry> VEntries = V.getLValuePath(); 1499a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith Entries.insert(Entries.end(), VEntries.begin(), VEntries.end()); 1509a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (V.getLValueBase()) 151b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength = 152b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith findMostDerivedSubobject(Ctx, getType(V.getLValueBase()), 153b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith V.getLValuePath(), MostDerivedArraySize, 154b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedType); 1559a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 1569a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 1579a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 1580a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith void setInvalid() { 1590a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Invalid = true; 1600a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Entries.clear(); 1610a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 162b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 163b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Determine whether this is a one-past-the-end pointer. 164b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool isOnePastTheEnd() const { 165b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (IsOnePastTheEnd) 166b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 167b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedArraySize && 168b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Entries[MostDerivedPathLength - 1].ArrayIndex == MostDerivedArraySize) 169b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 170b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 171b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 172b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 173b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Check that this refers to a valid subobject. 174b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool isValidSubobject() const { 175b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Invalid) 176b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 177b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return !isOnePastTheEnd(); 178b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 179b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Check that this refers to a valid subobject, and if not, produce a 180b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// relevant diagnostic and set the designator as invalid. 181b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkSubobject(EvalInfo &Info, const Expr *E, CheckSubobjectKind CSK); 182b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 183b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Update this designator to refer to the first element within this array. 184b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addArrayUnchecked(const ConstantArrayType *CAT) { 1850a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith PathEntry Entry; 186b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Entry.ArrayIndex = 0; 1870a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Entries.push_back(Entry); 188b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 189b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // This is a most-derived object. 190b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedType = CAT->getElementType(); 191b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedArraySize = CAT->getSize().getZExtValue(); 192b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength = Entries.size(); 1930a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 1940a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// Update this designator to refer to the given base or member of this 1950a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// object. 196b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addDeclUnchecked(const Decl *D, bool Virtual = false) { 1970a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith PathEntry Entry; 198180f47959a066795cc0f409433023af448bb0328Richard Smith APValue::BaseOrMemberType Value(D, Virtual); 199180f47959a066795cc0f409433023af448bb0328Richard Smith Entry.BaseOrMember = Value.getOpaqueValue(); 2000a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Entries.push_back(Entry); 201b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 202b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // If this isn't a base class, it's a new most-derived object. 203b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 204b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedType = FD->getType(); 205b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedArraySize = 0; 206b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength = Entries.size(); 207b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2080a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 209b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void diagnosePointerArithmetic(EvalInfo &Info, const Expr *E, uint64_t N); 2100a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// Add N to the address of this subobject. 211b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void adjustIndex(EvalInfo &Info, const Expr *E, uint64_t N) { 2120a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (Invalid) return; 213b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedPathLength == Entries.size() && MostDerivedArraySize) { 2149a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith Entries.back().ArrayIndex += N; 215b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Entries.back().ArrayIndex > MostDerivedArraySize) { 216b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith diagnosePointerArithmetic(Info, E, Entries.back().ArrayIndex); 217b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 218b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2190a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return; 2200a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 221b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // [expr.add]p4: For the purposes of these operators, a pointer to a 222b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // nonarray object behaves the same as a pointer to the first element of 223b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // an array of length one with the type of the object as its element type. 224b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (IsOnePastTheEnd && N == (uint64_t)-1) 225b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith IsOnePastTheEnd = false; 226b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else if (!IsOnePastTheEnd && N == 1) 227b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith IsOnePastTheEnd = true; 228b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else if (N != 0) { 229b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith diagnosePointerArithmetic(Info, E, uint64_t(IsOnePastTheEnd) + N); 2300a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith setInvalid(); 231b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2320a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 2330a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith }; 2340a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 23547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith /// A core constant value. This can be the value of any constant expression, 23647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith /// or a pointer or reference to a non-static object or function parameter. 237e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// 238e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// For an LValue, the base and offset are stored in the APValue subobject, 239e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// but the other information is stored in the SubobjectDesignator. For all 240e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// other value kinds, the value is stored directly in the APValue subobject. 24147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith class CCValue : public APValue { 24247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith typedef llvm::APSInt APSInt; 24347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith typedef llvm::APFloat APFloat; 244177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith /// If the value is a reference or pointer into a parameter or temporary, 245177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith /// this is the corresponding call stack frame. 246177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith CallStackFrame *CallFrame; 2470a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// If the value is a reference or pointer, this is a description of how the 2480a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// subobject was specified. 2490a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator Designator; 25047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith public: 251177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith struct GlobalValue {}; 252177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith 25347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue() {} 25447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith explicit CCValue(const APSInt &I) : APValue(I) {} 25547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith explicit CCValue(const APFloat &F) : APValue(F) {} 25647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue(const APValue *E, unsigned N) : APValue(E, N) {} 25747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue(const APSInt &R, const APSInt &I) : APValue(R, I) {} 25847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue(const APFloat &R, const APFloat &I) : APValue(R, I) {} 259177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith CCValue(const CCValue &V) : APValue(V), CallFrame(V.CallFrame) {} 2601bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith CCValue(LValueBase B, const CharUnits &O, CallStackFrame *F, 2610a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &D) : 2629a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith APValue(B, O, APValue::NoLValuePath()), CallFrame(F), Designator(D) {} 263b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CCValue(ASTContext &Ctx, const APValue &V, GlobalValue) : 264b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith APValue(V), CallFrame(0), Designator(Ctx, V) {} 265e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith CCValue(const ValueDecl *D, bool IsDerivedMember, 266e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ArrayRef<const CXXRecordDecl*> Path) : 267e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith APValue(D, IsDerivedMember, Path) {} 26865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman CCValue(const AddrLabelExpr* LHSExpr, const AddrLabelExpr* RHSExpr) : 26965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman APValue(LHSExpr, RHSExpr) {} 27047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith 271177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith CallStackFrame *getLValueFrame() const { 27247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith assert(getKind() == LValue); 273177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return CallFrame; 27447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith } 2750a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator &getLValueDesignator() { 2760a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith assert(getKind() == LValue); 2770a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return Designator; 2780a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 2790a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &getLValueDesignator() const { 2800a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return const_cast<CCValue*>(this)->getLValueDesignator(); 2810a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 28247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith }; 28347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith 284bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// A stack frame in the constexpr call stack. 285bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith struct CallStackFrame { 286bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith EvalInfo &Info; 287bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 288bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// Parent - The caller of this stack frame. 289bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame *Caller; 290bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 29108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// CallLoc - The location of the call expression for this call. 29208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SourceLocation CallLoc; 29308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 29408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// Callee - The function which was called. 29508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee; 29608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 297180f47959a066795cc0f409433023af448bb0328Richard Smith /// This - The binding for the this pointer in this call, if any. 298180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue *This; 299180f47959a066795cc0f409433023af448bb0328Richard Smith 300bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// ParmBindings - Parameter bindings for this function call, indexed by 301bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// parameters' function scope indices. 302bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith const CCValue *Arguments; 303bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 304bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith typedef llvm::DenseMap<const Expr*, CCValue> MapTy; 305bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith typedef MapTy::const_iterator temp_iterator; 306bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// Temporaries - Temporary lvalues materialized within this stack frame. 307bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith MapTy Temporaries; 308bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 30908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, 31008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee, const LValue *This, 311180f47959a066795cc0f409433023af448bb0328Richard Smith const CCValue *Arguments); 312bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith ~CallStackFrame(); 313bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith }; 314bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 315dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// A partial diagnostic which we might know in advance that we are not going 316dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// to emit. 317dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith class OptionalDiagnostic { 318dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith PartialDiagnostic *Diag; 319dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 320dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith public: 321dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith explicit OptionalDiagnostic(PartialDiagnostic *Diag = 0) : Diag(Diag) {} 322dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 323dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith template<typename T> 324dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith OptionalDiagnostic &operator<<(const T &v) { 325dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (Diag) 326dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith *Diag << v; 327dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return *this; 328dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 329dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith }; 330dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 331c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer struct EvalInfo { 332dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith ASTContext &Ctx; 3331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3341e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith /// EvalStatus - Contains information about the evaluation. 3351e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith Expr::EvalStatus &EvalStatus; 336f0c1e4b679e15c26bffb5892e35985bf3c52f77aAnders Carlsson 337d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// CurrentCall - The top of the constexpr call stack. 338bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame *CurrentCall; 339d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 340d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// CallStackDepth - The number of calls in the call stack right now. 341d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith unsigned CallStackDepth; 342d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 34347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith typedef llvm::DenseMap<const OpaqueValueExpr*, CCValue> MapTy; 344bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// OpaqueValues - Values used as the common expression in a 345bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// BinaryConditionalOperator. 346c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer MapTy OpaqueValues; 347bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 348bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// BottomFrame - The frame in which evaluation started. This must be 349bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// initialized last. 350bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame BottomFrame; 351bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 352180f47959a066795cc0f409433023af448bb0328Richard Smith /// EvaluatingDecl - This is the declaration whose initializer is being 353180f47959a066795cc0f409433023af448bb0328Richard Smith /// evaluated, if any. 354180f47959a066795cc0f409433023af448bb0328Richard Smith const VarDecl *EvaluatingDecl; 355180f47959a066795cc0f409433023af448bb0328Richard Smith 356180f47959a066795cc0f409433023af448bb0328Richard Smith /// EvaluatingDeclValue - This is the value being constructed for the 357180f47959a066795cc0f409433023af448bb0328Richard Smith /// declaration whose initializer is being evaluated, if any. 358180f47959a066795cc0f409433023af448bb0328Richard Smith APValue *EvaluatingDeclValue; 359180f47959a066795cc0f409433023af448bb0328Richard Smith 360c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// HasActiveDiagnostic - Was the previous diagnostic stored? If so, further 361c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// notes attached to it will also be stored, otherwise they will not be. 362c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith bool HasActiveDiagnostic; 363c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 364bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 365bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith EvalInfo(const ASTContext &C, Expr::EvalStatus &S) 366dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith : Ctx(const_cast<ASTContext&>(C)), EvalStatus(S), CurrentCall(0), 36708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackDepth(0), BottomFrame(*this, SourceLocation(), 0, 0, 0), 36808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith EvaluatingDecl(0), EvaluatingDeclValue(0), HasActiveDiagnostic(false) {} 369bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 37047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith const CCValue *getOpaqueValue(const OpaqueValueExpr *e) const { 371c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer MapTy::const_iterator i = OpaqueValues.find(e); 372c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer if (i == OpaqueValues.end()) return 0; 373c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer return &i->second; 374c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer } 37556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 376180f47959a066795cc0f409433023af448bb0328Richard Smith void setEvaluatingDecl(const VarDecl *VD, APValue &Value) { 377180f47959a066795cc0f409433023af448bb0328Richard Smith EvaluatingDecl = VD; 378180f47959a066795cc0f409433023af448bb0328Richard Smith EvaluatingDeclValue = &Value; 379180f47959a066795cc0f409433023af448bb0328Richard Smith } 380180f47959a066795cc0f409433023af448bb0328Richard Smith 381c18c42345636e2866fed75c7e434fb659d747672Richard Smith const LangOptions &getLangOpts() const { return Ctx.getLangOptions(); } 382c18c42345636e2866fed75c7e434fb659d747672Richard Smith 383c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith bool CheckCallLimit(SourceLocation Loc) { 384c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (CallStackDepth <= getLangOpts().ConstexprCallDepth) 385c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 386c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Diag(Loc, diag::note_constexpr_depth_limit_exceeded) 387c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << getLangOpts().ConstexprCallDepth; 388c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 389c18c42345636e2866fed75c7e434fb659d747672Richard Smith } 390f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 391c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith private: 392c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Add a diagnostic to the diagnostics list. 393c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith PartialDiagnostic &addDiag(SourceLocation Loc, diag::kind DiagId) { 394c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith PartialDiagnostic PD(DiagId, Ctx.getDiagAllocator()); 395c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith EvalStatus.Diag->push_back(std::make_pair(Loc, PD)); 396c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return EvalStatus.Diag->back().second; 397c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 398c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 39908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// Add notes containing a call stack to the current point of evaluation. 40008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith void addCallStack(unsigned Limit); 40108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 402c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith public: 403f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// Diagnose that the evaluation cannot be folded. 4047098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith OptionalDiagnostic Diag(SourceLocation Loc, diag::kind DiagId 4057098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith = diag::note_invalid_subexpr_in_const_expr, 406c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned ExtraNotes = 0) { 407f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // If we have a prior diagnostic, it will be noting that the expression 408f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // isn't a constant expression. This diagnostic is more important. 409f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: We might want to show both diagnostics to the user. 410dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (EvalStatus.Diag) { 41108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned CallStackNotes = CallStackDepth - 1; 41208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned Limit = Ctx.getDiagnostics().getConstexprBacktraceLimit(); 41308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (Limit) 41408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackNotes = std::min(CallStackNotes, Limit + 1); 41508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 416c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HasActiveDiagnostic = true; 417dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith EvalStatus.Diag->clear(); 41808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith EvalStatus.Diag->reserve(1 + ExtraNotes + CallStackNotes); 41908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Loc, DiagId); 42008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addCallStack(Limit); 42108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith return OptionalDiagnostic(&(*EvalStatus.Diag)[0].second); 422dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 423c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HasActiveDiagnostic = false; 424dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return OptionalDiagnostic(); 425dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 426dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 427dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// Diagnose that the evaluation does not produce a C++11 core constant 428dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// expression. 4297098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith OptionalDiagnostic CCEDiag(SourceLocation Loc, diag::kind DiagId 4307098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith = diag::note_invalid_subexpr_in_const_expr, 431c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned ExtraNotes = 0) { 432dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith // Don't override a previous diagnostic. 433dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (!EvalStatus.Diag || !EvalStatus.Diag->empty()) 434dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return OptionalDiagnostic(); 435c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return Diag(Loc, DiagId, ExtraNotes); 436c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 437c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 438c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Add a note to a prior diagnostic. 439c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith OptionalDiagnostic Note(SourceLocation Loc, diag::kind DiagId) { 440c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!HasActiveDiagnostic) 441c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return OptionalDiagnostic(); 442c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return OptionalDiagnostic(&addDiag(Loc, DiagId)); 443f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 444099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 445099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith /// Add a stack of notes to a prior diagnostic. 446099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith void addNotes(ArrayRef<PartialDiagnosticAt> Diags) { 447099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (HasActiveDiagnostic) { 448099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EvalStatus.Diag->insert(EvalStatus.Diag->end(), 449099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Diags.begin(), Diags.end()); 450099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 451099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 452c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer }; 45308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 45408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 455b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithbool SubobjectDesignator::checkSubobject(EvalInfo &Info, const Expr *E, 456b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CheckSubobjectKind CSK) { 457b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Invalid) 458b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 459b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (isOnePastTheEnd()) { 460b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_past_end_subobject) 461b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << CSK; 462b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 463b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 464b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 465b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 466b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith} 467b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 468b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithvoid SubobjectDesignator::diagnosePointerArithmetic(EvalInfo &Info, 469b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const Expr *E, uint64_t N) { 470b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedPathLength == Entries.size() && MostDerivedArraySize) 471b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_array_index) 472b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<int>(N) << /*array*/ 0 473b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<unsigned>(MostDerivedArraySize); 474b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 475b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_array_index) 476b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<int>(N) << /*non-array*/ 1; 477b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 478b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith} 479b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 48008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard SmithCallStackFrame::CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, 48108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee, const LValue *This, 48208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const CCValue *Arguments) 48308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith : Info(Info), Caller(Info.CurrentCall), CallLoc(CallLoc), Callee(Callee), 48408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith This(This), Arguments(Arguments) { 48508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Info.CurrentCall = this; 48608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith ++Info.CallStackDepth; 48708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 48808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 48908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard SmithCallStackFrame::~CallStackFrame() { 49008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith assert(Info.CurrentCall == this && "calls retired out of order"); 49108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith --Info.CallStackDepth; 49208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Info.CurrentCall = Caller; 49308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 49487eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner 49508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith/// Produce a string describing the given constexpr call. 49608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithstatic void describeCall(CallStackFrame *Frame, llvm::raw_ostream &Out) { 49708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned ArgIndex = 0; 49808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith bool IsMemberCall = isa<CXXMethodDecl>(Frame->Callee) && 49908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith !isa<CXXConstructorDecl>(Frame->Callee); 50008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 50108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (!IsMemberCall) 50208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << *Frame->Callee << '('; 50308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 50408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith for (FunctionDecl::param_const_iterator I = Frame->Callee->param_begin(), 50508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith E = Frame->Callee->param_end(); I != E; ++I, ++ArgIndex) { 50608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (ArgIndex > IsMemberCall) 50708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << ", "; 50808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 50908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const ParmVarDecl *Param = *I; 51008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const CCValue &Arg = Frame->Arguments[ArgIndex]; 51108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (!Arg.isLValue() || Arg.getLValueDesignator().Invalid) 51208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Arg.printPretty(Out, Frame->Info.Ctx, Param->getType()); 51308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith else { 51408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Deliberately slice off the frame to form an APValue we can print. 51508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith APValue Value(Arg.getLValueBase(), Arg.getLValueOffset(), 51608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Arg.getLValueDesignator().Entries, 517b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Arg.getLValueDesignator().IsOnePastTheEnd); 51808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Value.printPretty(Out, Frame->Info.Ctx, Param->getType()); 51908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 52008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 52108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (ArgIndex == 0 && IsMemberCall) 52208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << "->" << *Frame->Callee << '('; 523bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith } 524d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 52508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << ')'; 52608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 52708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 52808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithvoid EvalInfo::addCallStack(unsigned Limit) { 52908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Determine which calls to skip, if any. 53008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned ActiveCalls = CallStackDepth - 1; 53108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned SkipStart = ActiveCalls, SkipEnd = SkipStart; 53208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (Limit && Limit < ActiveCalls) { 53308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SkipStart = Limit / 2 + Limit % 2; 53408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SkipEnd = ActiveCalls - Limit / 2; 53508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 53608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 53708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Walk the call stack and add the diagnostics. 53808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned CallIdx = 0; 53908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith for (CallStackFrame *Frame = CurrentCall; Frame != &BottomFrame; 54008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Frame = Frame->Caller, ++CallIdx) { 54108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Skip this call? 54208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (CallIdx >= SkipStart && CallIdx < SkipEnd) { 54308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (CallIdx == SkipStart) { 54408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Note that we're skipping calls. 54508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Frame->CallLoc, diag::note_constexpr_calls_suppressed) 54608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith << unsigned(ActiveCalls - Limit); 54708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 54808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith continue; 54908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 55008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 55108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith llvm::SmallVector<char, 128> Buffer; 55208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith llvm::raw_svector_ostream Out(Buffer); 55308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith describeCall(Frame, Out); 55408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Frame->CallLoc, diag::note_constexpr_call_here) << Out.str(); 555bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith } 55608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 557d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 55808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithnamespace { 559f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall struct ComplexValue { 560f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall private: 561f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool IsInt; 562f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 563f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall public: 564f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt IntReal, IntImag; 565f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat FloatReal, FloatImag; 566f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 567f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue() : FloatReal(APFloat::Bogus), FloatImag(APFloat::Bogus) {} 568f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 569f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall void makeComplexFloat() { IsInt = false; } 570f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool isComplexFloat() const { return !IsInt; } 571f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat &getComplexFloatReal() { return FloatReal; } 572f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat &getComplexFloatImag() { return FloatImag; } 573f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 574f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall void makeComplexInt() { IsInt = true; } 575f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool isComplexInt() const { return IsInt; } 576f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt &getComplexIntReal() { return IntReal; } 577f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt &getComplexIntImag() { return IntImag; } 578f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 57947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith void moveInto(CCValue &v) const { 580f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall if (isComplexFloat()) 58147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith v = CCValue(FloatReal, FloatImag); 582f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall else 58347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith v = CCValue(IntReal, IntImag); 584f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall } 58547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith void setFrom(const CCValue &v) { 58656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall assert(v.isComplexFloat() || v.isComplexInt()); 58756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (v.isComplexFloat()) { 58856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall makeComplexFloat(); 58956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall FloatReal = v.getComplexFloatReal(); 59056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall FloatImag = v.getComplexFloatImag(); 59156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } else { 59256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall makeComplexInt(); 59356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall IntReal = v.getComplexIntReal(); 59456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall IntImag = v.getComplexIntImag(); 59556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 59656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 597f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall }; 598efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 599efdb83e26f9a1fd2566afe54461216cd84814d42John McCall struct LValue { 6001bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith APValue::LValueBase Base; 601efdb83e26f9a1fd2566afe54461216cd84814d42John McCall CharUnits Offset; 602177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith CallStackFrame *Frame; 6030a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator Designator; 604efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 6051bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const APValue::LValueBase getLValueBase() const { return Base; } 60647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CharUnits &getLValueOffset() { return Offset; } 607625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const CharUnits &getLValueOffset() const { return Offset; } 608177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith CallStackFrame *getLValueFrame() const { return Frame; } 6090a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator &getLValueDesignator() { return Designator; } 6100a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &getLValueDesignator() const { return Designator;} 611efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 61247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith void moveInto(CCValue &V) const { 6130a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith V = CCValue(Base, Offset, Frame, Designator); 614efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } 61547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith void setFrom(const CCValue &V) { 61647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith assert(V.isLValue()); 61747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Base = V.getLValueBase(); 61847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Offset = V.getLValueOffset(); 619177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith Frame = V.getLValueFrame(); 6200a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Designator = V.getLValueDesignator(); 6210a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 6220a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 6231bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith void set(APValue::LValueBase B, CallStackFrame *F = 0) { 6241bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Base = B; 6250a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Offset = CharUnits::Zero(); 6260a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Frame = F; 627b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator = SubobjectDesignator(getType(B)); 628b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 629b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 630b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check that this LValue is not based on a null pointer. If it is, produce 631b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // a diagnostic and mark the designator as invalid. 632b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkNullPointer(EvalInfo &Info, const Expr *E, 633b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CheckSubobjectKind CSK) { 634b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.Invalid) 635b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 636b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Base) { 637b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_null_subobject) 638b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << CSK; 639b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.setInvalid(); 640b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 641b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 642b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 643b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 644b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 645b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check this LValue refers to an object. If not, set the designator to be 646b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // invalid and emit a diagnostic. 647b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkSubobject(EvalInfo &Info, const Expr *E, CheckSubobjectKind CSK) { 648b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return checkNullPointer(Info, E, CSK) && 649b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.checkSubobject(Info, E, CSK); 650b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 651b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 652b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addDecl(EvalInfo &Info, const Expr *E, 653b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const Decl *D, bool Virtual = false) { 654b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith checkSubobject(Info, E, isa<FieldDecl>(D) ? CSK_Field : CSK_Base); 655b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addDeclUnchecked(D, Virtual); 656b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 657b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addArray(EvalInfo &Info, const Expr *E, const ConstantArrayType *CAT) { 658b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith checkSubobject(Info, E, CSK_ArrayToPointer); 659b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addArrayUnchecked(CAT); 660b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 661b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void adjustIndex(EvalInfo &Info, const Expr *E, uint64_t N) { 662b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!checkNullPointer(Info, E, CSK_ArrayIndex)) 663b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return; 664b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.adjustIndex(Info, E, N); 66556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 666efdb83e26f9a1fd2566afe54461216cd84814d42John McCall }; 667e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 668e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith struct MemberPtr { 669e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr() {} 670e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith explicit MemberPtr(const ValueDecl *Decl) : 671e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember(Decl, false), Path() {} 672e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 673e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// The member or (direct or indirect) field referred to by this member 674e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// pointer, or 0 if this is a null member pointer. 675e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ValueDecl *getDecl() const { 676e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DeclAndIsDerivedMember.getPointer(); 677e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 678e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Is this actually a member of some type derived from the relevant class? 679e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool isDerivedMember() const { 680e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DeclAndIsDerivedMember.getInt(); 681e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 682e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Get the class which the declaration actually lives in. 683e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *getContainingRecord() const { 684e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return cast<CXXRecordDecl>( 685e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.getPointer()->getDeclContext()); 686e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 687e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 688e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith void moveInto(CCValue &V) const { 689e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith V = CCValue(getDecl(), isDerivedMember(), Path); 690e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 691e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith void setFrom(const CCValue &V) { 692e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(V.isMemberPointer()); 693e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setPointer(V.getMemberPointerDecl()); 694e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(V.isMemberPointerToDerivedMember()); 695e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.clear(); 696e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ArrayRef<const CXXRecordDecl*> P = V.getMemberPointerPath(); 697e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.insert(Path.end(), P.begin(), P.end()); 698e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 699e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 700e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// DeclAndIsDerivedMember - The member declaration, and a flag indicating 701e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// whether the member is a member of some class derived from the class type 702e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// of the member pointer. 703e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith llvm::PointerIntPair<const ValueDecl*, 1, bool> DeclAndIsDerivedMember; 704e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Path - The path of base/derived classes from the member declaration's 705e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// class (exclusive) to the class type of the member pointer (inclusive). 706e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith SmallVector<const CXXRecordDecl*, 4> Path; 707e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 708e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a cast towards the class of the Decl (either up or down the 709e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// hierarchy). 710e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castBack(const CXXRecordDecl *Class) { 711e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!Path.empty()); 712e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Expected; 713e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.size() >= 2) 714e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Expected = Path[Path.size() - 2]; 715e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith else 716e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Expected = getContainingRecord(); 717e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Expected->getCanonicalDecl() != Class->getCanonicalDecl()) { 718e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.static.cast]p12: In a conversion from (D::*) to (B::*), 719e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // if B does not contain the original member and is not a base or 720e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // derived class of the class containing the original member, the result 721e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // of the cast is undefined. 722e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [conv.mem]p2 does not cover this case for a cast from (B::*) to 723e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // (D::*). We consider that to be a language defect. 724e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 725e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 726e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.pop_back(); 727e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 728e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 729e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a base-to-derived member pointer cast. 730e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castToDerived(const CXXRecordDecl *Derived) { 731e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!getDecl()) 732e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 733e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!isDerivedMember()) { 734e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.push_back(Derived); 735e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 736e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 737e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!castBack(Derived)) 738e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 739e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.empty()) 740e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(false); 741e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 742e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 743e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a derived-to-base member pointer cast. 744e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castToBase(const CXXRecordDecl *Base) { 745e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!getDecl()) 746e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 747e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.empty()) 748e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(true); 749e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isDerivedMember()) { 750e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.push_back(Base); 751e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 752e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 753e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return castBack(Base); 754e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 755e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith }; 756c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 757c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Kinds of constant expression checking, for diagnostics. 758c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith enum CheckConstantExpressionKind { 759c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_Constant, ///< A normal constant. 760c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_ReturnValue, ///< A constexpr function return value. 761c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_MemberInit ///< A constexpr constructor mem-initializer. 762c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith }; 763f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall} 76487eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner 76547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smithstatic bool Evaluate(CCValue &Result, EvalInfo &Info, const Expr *E); 76669c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smithstatic bool EvaluateConstantExpression(APValue &Result, EvalInfo &Info, 767c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const LValue &This, const Expr *E, 768c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CheckConstantExpressionKind CCEK 769c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith = CCEK_Constant); 770efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluateLValue(const Expr *E, LValue &Result, EvalInfo &Info); 771efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluatePointer(const Expr *E, LValue &Result, EvalInfo &Info); 772e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, 773e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith EvalInfo &Info); 774e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info); 77587eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattnerstatic bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info); 77647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smithstatic bool EvaluateIntegerOrLValue(const Expr *E, CCValue &Result, 777d9becd1846e2c72bf6ad283faa1b048f33dd3afeChris Lattner EvalInfo &Info); 778d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanstatic bool EvaluateFloat(const Expr *E, APFloat &Result, EvalInfo &Info); 779f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCallstatic bool EvaluateComplex(const Expr *E, ComplexValue &Res, EvalInfo &Info); 780f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 781f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 7824efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman// Misc utilities 7834efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 7844efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 785180f47959a066795cc0f409433023af448bb0328Richard Smith/// Should this call expression be treated as a string literal? 786180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool IsStringLiteralCall(const CallExpr *E) { 787180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned Builtin = E->isBuiltinCall(); 788180f47959a066795cc0f409433023af448bb0328Richard Smith return (Builtin == Builtin::BI__builtin___CFStringMakeConstantString || 789180f47959a066795cc0f409433023af448bb0328Richard Smith Builtin == Builtin::BI__builtin___NSStringMakeConstantString); 790180f47959a066795cc0f409433023af448bb0328Richard Smith} 791180f47959a066795cc0f409433023af448bb0328Richard Smith 7921bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smithstatic bool IsGlobalLValue(APValue::LValueBase B) { 793180f47959a066795cc0f409433023af448bb0328Richard Smith // C++11 [expr.const]p3 An address constant expression is a prvalue core 794180f47959a066795cc0f409433023af448bb0328Richard Smith // constant expression of pointer type that evaluates to... 795180f47959a066795cc0f409433023af448bb0328Richard Smith 796180f47959a066795cc0f409433023af448bb0328Richard Smith // ... a null pointer value, or a prvalue core constant expression of type 797180f47959a066795cc0f409433023af448bb0328Richard Smith // std::nullptr_t. 7981bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!B) return true; 79942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 8001bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { 801180f47959a066795cc0f409433023af448bb0328Richard Smith // ... the address of an object with static storage duration, 8021bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 80342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return VD->hasGlobalStorage(); 8041bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith // ... the address of a function, 8051bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return isa<FunctionDecl>(D); 80642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall } 8071bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith 8081bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const Expr *E = B.get<const Expr*>(); 8091bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith switch (E->getStmtClass()) { 8101bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith default: 8111bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return false; 812180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::CompoundLiteralExprClass: 813180f47959a066795cc0f409433023af448bb0328Richard Smith return cast<CompoundLiteralExpr>(E)->isFileScope(); 814180f47959a066795cc0f409433023af448bb0328Richard Smith // A string literal has static storage duration. 815180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::StringLiteralClass: 816180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::PredefinedExprClass: 817180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::ObjCStringLiteralClass: 818180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::ObjCEncodeExprClass: 81947d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith case Expr::CXXTypeidExprClass: 820180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 821180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::CallExprClass: 822180f47959a066795cc0f409433023af448bb0328Richard Smith return IsStringLiteralCall(cast<CallExpr>(E)); 823180f47959a066795cc0f409433023af448bb0328Richard Smith // For GCC compatibility, &&label has static storage duration. 824180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::AddrLabelExprClass: 825180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 826180f47959a066795cc0f409433023af448bb0328Richard Smith // A Block literal expression may be used as the initialization value for 827180f47959a066795cc0f409433023af448bb0328Richard Smith // Block variables at global or local static scope. 828180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::BlockExprClass: 829180f47959a066795cc0f409433023af448bb0328Richard Smith return !cast<BlockExpr>(E)->getBlockDecl()->hasCaptures(); 830180f47959a066795cc0f409433023af448bb0328Richard Smith } 83142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 83242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 8339a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// Check that this reference or pointer core constant expression is a valid 834b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// value for an address or reference constant expression. Type T should be 83561e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith/// either LValue or CCValue. Return true if we can fold this expression, 83661e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith/// whether or not it's a constant expression. 8379a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smithtemplate<typename T> 838f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool CheckLValueConstantExpression(EvalInfo &Info, const Expr *E, 839c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const T &LVal, APValue &Value, 840c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CheckConstantExpressionKind CCEK) { 841c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APValue::LValueBase Base = LVal.getLValueBase(); 842c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const SubobjectDesignator &Designator = LVal.getLValueDesignator(); 843c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 844c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!IsGlobalLValue(Base)) { 845c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 846c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 847c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_non_global, 1) 848c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << E->isGLValue() << !Designator.Entries.empty() 849c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << !!VD << CCEK << VD; 850c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (VD) 851c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 852c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith else 853c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Note(Base.dyn_cast<const Expr*>()->getExprLoc(), 854c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith diag::note_constexpr_temporary_here); 855c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else { 8567098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc()); 857c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 85861e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith // Don't allow references to temporaries to escape. 85969c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return false; 860f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 86169c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 862b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool IsReferenceType = E->isGLValue(); 863b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 864b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.Invalid) { 86561e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith // This is not a core constant expression. An appropriate diagnostic will 86661e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith // have already been produced. 8679a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith Value = APValue(LVal.getLValueBase(), LVal.getLValueOffset(), 8689a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith APValue::NoLValuePath()); 8699a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith return true; 8709a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 8719a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 872b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Value = APValue(LVal.getLValueBase(), LVal.getLValueOffset(), 873b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.Entries, Designator.IsOnePastTheEnd); 874b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 875b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Allow address constant expressions to be past-the-end pointers. This is 876b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // an extension: the standard requires them to point to an object. 877b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!IsReferenceType) 878b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 879b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 880b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A reference constant expression must refer to an object. 881b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Base) { 882b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // FIXME: diagnostic 883b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc()); 88461e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith return true; 885b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 886b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 887c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith // Does this refer one past the end of some object? 888b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.isOnePastTheEnd()) { 889c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 890c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_past_end, 1) 891c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << !Designator.Entries.empty() << !!VD << VD; 892c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (VD) 893c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 894c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith else 895c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Note(Base.dyn_cast<const Expr*>()->getExprLoc(), 896c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith diag::note_constexpr_temporary_here); 897c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 898c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 89969c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return true; 90047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith} 90147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith 90251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// Check that this core constant expression is of literal type, and if not, 90351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// produce an appropriate diagnostic. 90451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smithstatic bool CheckLiteralType(EvalInfo &Info, const Expr *E) { 90551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!E->isRValue() || E->getType()->isLiteralType()) 90651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 90751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 90851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Prvalue constant expressions must be of literal types. 90951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (Info.getLangOpts().CPlusPlus0x) 91051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_nonliteral) 91151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith << E->getType(); 91251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith else 91351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 91451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 91551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 91651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 9179a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// Check that this core constant expression value is a valid value for a 9189a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// constant expression, and if it is, produce the corresponding constant value. 91951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// If not, report an appropriate diagnostic. Does not check that the expression 92051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// is of literal type. 921f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool CheckConstantExpression(EvalInfo &Info, const Expr *E, 922c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const CCValue &CCValue, APValue &Value, 923c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CheckConstantExpressionKind CCEK 924c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith = CCEK_Constant) { 9259a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (!CCValue.isLValue()) { 9269a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith Value = CCValue; 9279a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith return true; 9289a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 929c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return CheckLValueConstantExpression(Info, E, CCValue, Value, CCEK); 9309a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith} 9319a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 9329e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smithconst ValueDecl *GetLValueBaseDecl(const LValue &LVal) { 9331bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return LVal.Base.dyn_cast<const ValueDecl*>(); 9349e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith} 9359e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith 9369e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smithstatic bool IsLiteralLValue(const LValue &Value) { 9371bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Value.Base.dyn_cast<const Expr*>() && !Value.Frame; 9389e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith} 9399e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith 94065ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smithstatic bool IsWeakLValue(const LValue &Value) { 94165ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith const ValueDecl *Decl = GetLValueBaseDecl(Value); 9420dd7a25e8d679de1dc0ce788222d6dee0e879885Lang Hames return Decl && Decl->isWeak(); 94365ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith} 94465ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith 945e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvalPointerValueAsBool(const CCValue &Value, bool &Result) { 9463554283157190e67918fad4221a5e6faf9317362John McCall // A null base expression indicates a null pointer. These are always 9473554283157190e67918fad4221a5e6faf9317362John McCall // evaluatable, and they are false unless the offset is zero. 948e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Value.getLValueBase()) { 949e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = !Value.getLValueOffset().isZero(); 9503554283157190e67918fad4221a5e6faf9317362John McCall return true; 9513554283157190e67918fad4221a5e6faf9317362John McCall } 9523554283157190e67918fad4221a5e6faf9317362John McCall 95342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall // Require the base expression to be a global l-value. 95447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith // FIXME: C++11 requires such conversions. Remove this check. 955e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!IsGlobalLValue(Value.getLValueBase())) return false; 95642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 957e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // We have a non-null base. These are generally known to be true, but if it's 958e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // a weak declaration it can be null at runtime. 9593554283157190e67918fad4221a5e6faf9317362John McCall Result = true; 960e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ValueDecl *Decl = Value.getLValueBase().dyn_cast<const ValueDecl*>(); 9610dd7a25e8d679de1dc0ce788222d6dee0e879885Lang Hames return !Decl || !Decl->isWeak(); 9625bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman} 9635bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman 96447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smithstatic bool HandleConversionToBool(const CCValue &Val, bool &Result) { 965c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith switch (Val.getKind()) { 966c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Uninitialized: 967c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 968c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Int: 969c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = Val.getInt().getBoolValue(); 97041bf4f38348561a0f12c10d34f1673cd19a6eb04Richard Smith return true; 971c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Float: 972c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = !Val.getFloat().isZero(); 973a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman return true; 974c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::ComplexInt: 975c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = Val.getComplexIntReal().getBoolValue() || 976c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Val.getComplexIntImag().getBoolValue(); 977c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return true; 978c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::ComplexFloat: 979c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = !Val.getComplexFloatReal().isZero() || 980c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith !Val.getComplexFloatImag().isZero(); 981436c8898cd1c93c5bacd3fcc4ac586bc5cd77062Richard Smith return true; 982e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case APValue::LValue: 983e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvalPointerValueAsBool(Val, Result); 984e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case APValue::MemberPointer: 985e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = Val.getMemberPointerDecl(); 986e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 987c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Vector: 988cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith case APValue::Array: 989180f47959a066795cc0f409433023af448bb0328Richard Smith case APValue::Struct: 990180f47959a066795cc0f409433023af448bb0328Richard Smith case APValue::Union: 99165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman case APValue::AddrLabelDiff: 992c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 9934efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 9944efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 995c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith llvm_unreachable("unknown APValue kind"); 996c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 997c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 998c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithstatic bool EvaluateAsBooleanCondition(const Expr *E, bool &Result, 999c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalInfo &Info) { 1000c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && "missing lvalue-to-rvalue conv in bool condition"); 100147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue Val; 1002c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!Evaluate(Val, Info, E)) 1003c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1004c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return HandleConversionToBool(Val, Result); 10054efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 10064efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 1007c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithtemplate<typename T> 1008c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleOverflow(EvalInfo &Info, const Expr *E, 1009c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const T &SrcValue, QualType DestType) { 1010c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith llvm::SmallVector<char, 32> Buffer; 1011c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith SrcValue.toString(Buffer); 1012c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_overflow) 1013c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << StringRef(Buffer.data(), Buffer.size()) << DestType; 1014c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 1015c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith} 1016c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 1017c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleFloatToIntCast(EvalInfo &Info, const Expr *E, 1018c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, const APFloat &Value, 1019c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType DestType, APSInt &Result) { 1020c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned DestWidth = Info.Ctx.getIntWidth(DestType); 1021a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // Determine whether we are converting to unsigned or signed. 1022575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor bool DestSigned = DestType->isSignedIntegerOrEnumerationType(); 10231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1024c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result = APSInt(DestWidth, !DestSigned); 1025a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar bool ignored; 1026c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Value.convertToInteger(Result, llvm::APFloat::rmTowardZero, &ignored) 1027c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opInvalidOp) 1028c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1029c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1030a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1031a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1032c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleFloatToFloatCast(EvalInfo &Info, const Expr *E, 1033c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, QualType DestType, 1034c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat &Result) { 1035c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat Value = Result; 1036a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar bool ignored; 1037c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Result.convert(Info.Ctx.getFloatTypeSemantics(DestType), 1038c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat::rmNearestTiesToEven, &ignored) 1039c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opOverflow) 1040c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1041c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1042a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1043a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 10441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic APSInt HandleIntToIntCast(QualType DestType, QualType SrcType, 10454ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foad APSInt &Value, const ASTContext &Ctx) { 1046a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar unsigned DestWidth = Ctx.getIntWidth(DestType); 1047a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar APSInt Result = Value; 1048a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // Figure out if this is a truncate, extend or noop cast. 1049a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // If the input is signed, do a sign extend, noop, or truncate. 10509f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Result = Result.extOrTrunc(DestWidth); 1051575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor Result.setIsUnsigned(DestType->isUnsignedIntegerOrEnumerationType()); 1052a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar return Result; 1053a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1054a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1055c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleIntToFloatCast(EvalInfo &Info, const Expr *E, 1056c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, const APSInt &Value, 1057c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType DestType, APFloat &Result) { 1058c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result = APFloat(Info.Ctx.getFloatTypeSemantics(DestType), 1); 1059c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Result.convertFromAPInt(Value, Value.isSigned(), 1060c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat::rmNearestTiesToEven) 1061c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opOverflow) 1062c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1063c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1064a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1065a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1066e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedmanstatic bool EvalAndBitcastToAPInt(EvalInfo &Info, const Expr *E, 1067e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt &Res) { 1068e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman CCValue SVal; 1069e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (!Evaluate(SVal, Info, E)) 1070e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1071e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isInt()) { 1072e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = SVal.getInt(); 1073e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1074e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1075e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isFloat()) { 1076e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = SVal.getFloat().bitcastToAPInt(); 1077e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1078e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1079e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isVector()) { 1080e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType VecTy = E->getType(); 1081e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned VecSize = Info.Ctx.getTypeSize(VecTy); 1082e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType EltTy = VecTy->castAs<VectorType>()->getElementType(); 1083e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned EltSize = Info.Ctx.getTypeSize(EltTy); 1084e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); 1085e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = llvm::APInt::getNullValue(VecSize); 1086e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < SVal.getVectorLength(); i++) { 1087e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman APValue &Elt = SVal.getVectorElt(i); 1088e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt EltAsInt; 1089e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (Elt.isInt()) { 1090e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman EltAsInt = Elt.getInt(); 1091e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else if (Elt.isFloat()) { 1092e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman EltAsInt = Elt.getFloat().bitcastToAPInt(); 1093e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else { 1094e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Don't try to handle vectors of anything other than int or float 1095e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // (not sure if it's possible to hit this case). 1096e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1097e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1098e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1099e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned BaseEltSize = EltAsInt.getBitWidth(); 1100e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 1101e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res |= EltAsInt.zextOrTrunc(VecSize).rotr(i*EltSize+BaseEltSize); 1102e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 1103e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res |= EltAsInt.zextOrTrunc(VecSize).rotl(i*EltSize); 1104e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1105e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1106e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1107e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Give up if the input isn't an int, float, or vector. For example, we 1108e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // reject "(v4i16)(intptr_t)&a". 1109e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1110e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1111e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman} 1112e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman 1113b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// Cast an lvalue referring to a base subobject to a derived class, by 1114b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// truncating the lvalue's path to the given length. 1115b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool CastToDerivedClass(EvalInfo &Info, const Expr *E, LValue &Result, 1116b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const RecordDecl *TruncatedType, 1117b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned TruncatedElements) { 1118b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator &D = Result.Designator; 1119180f47959a066795cc0f409433023af448bb0328Richard Smith 1120b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check we actually point to a derived class object. 1121b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (TruncatedElements == D.Entries.size()) 1122b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 1123b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith assert(TruncatedElements >= D.MostDerivedPathLength && 1124b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith "not casting to a derived class"); 1125b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Result.checkSubobject(Info, E, CSK_Derived)) 1126180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1127180f47959a066795cc0f409433023af448bb0328Richard Smith 1128b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Truncate the path to the subobject, and remove any derived-to-base offsets. 1129e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const RecordDecl *RD = TruncatedType; 1130e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = TruncatedElements, N = D.Entries.size(); I != N; ++I) { 1131180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 1132180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Base = getAsBaseClass(D.Entries[I]); 1133e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isVirtualBaseClass(D.Entries[I])) 1134180f47959a066795cc0f409433023af448bb0328Richard Smith Result.Offset -= Layout.getVBaseClassOffset(Base); 1135e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith else 1136180f47959a066795cc0f409433023af448bb0328Richard Smith Result.Offset -= Layout.getBaseClassOffset(Base); 1137180f47959a066795cc0f409433023af448bb0328Richard Smith RD = Base; 1138180f47959a066795cc0f409433023af448bb0328Richard Smith } 1139e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith D.Entries.resize(TruncatedElements); 1140180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1141180f47959a066795cc0f409433023af448bb0328Richard Smith} 1142180f47959a066795cc0f409433023af448bb0328Richard Smith 1143b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic void HandleLValueDirectBase(EvalInfo &Info, const Expr *E, LValue &Obj, 1144180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Derived, 1145180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Base, 1146180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout *RL = 0) { 1147180f47959a066795cc0f409433023af448bb0328Richard Smith if (!RL) RL = &Info.Ctx.getASTRecordLayout(Derived); 1148180f47959a066795cc0f409433023af448bb0328Richard Smith Obj.getLValueOffset() += RL->getBaseClassOffset(Base); 1149b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj.addDecl(Info, E, Base, /*Virtual*/ false); 1150180f47959a066795cc0f409433023af448bb0328Richard Smith} 1151180f47959a066795cc0f409433023af448bb0328Richard Smith 1152b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleLValueBase(EvalInfo &Info, const Expr *E, LValue &Obj, 1153180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *DerivedDecl, 1154180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXBaseSpecifier *Base) { 1155180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *BaseDecl = Base->getType()->getAsCXXRecordDecl(); 1156180f47959a066795cc0f409433023af448bb0328Richard Smith 1157180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Base->isVirtual()) { 1158b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, E, Obj, DerivedDecl, BaseDecl); 1159180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1160180f47959a066795cc0f409433023af448bb0328Richard Smith } 1161180f47959a066795cc0f409433023af448bb0328Richard Smith 1162b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator &D = Obj.Designator; 1163b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.Invalid) 1164b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1165b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1166180f47959a066795cc0f409433023af448bb0328Richard Smith // Extract most-derived object and corresponding type. 1167b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith DerivedDecl = D.MostDerivedType->getAsCXXRecordDecl(); 1168b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!CastToDerivedClass(Info, E, Obj, DerivedDecl, D.MostDerivedPathLength)) 1169180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1170180f47959a066795cc0f409433023af448bb0328Richard Smith 1171b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Find the virtual base class. 1172180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(DerivedDecl); 1173180f47959a066795cc0f409433023af448bb0328Richard Smith Obj.getLValueOffset() += Layout.getVBaseClassOffset(BaseDecl); 1174b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj.addDecl(Info, E, BaseDecl, /*Virtual*/ true); 1175180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1176180f47959a066795cc0f409433023af448bb0328Richard Smith} 1177180f47959a066795cc0f409433023af448bb0328Richard Smith 1178180f47959a066795cc0f409433023af448bb0328Richard Smith/// Update LVal to refer to the given field, which must be a member of the type 1179180f47959a066795cc0f409433023af448bb0328Richard Smith/// currently described by LVal. 1180b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic void HandleLValueMember(EvalInfo &Info, const Expr *E, LValue &LVal, 1181180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *FD, 1182180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout *RL = 0) { 1183180f47959a066795cc0f409433023af448bb0328Richard Smith if (!RL) 1184180f47959a066795cc0f409433023af448bb0328Richard Smith RL = &Info.Ctx.getASTRecordLayout(FD->getParent()); 1185180f47959a066795cc0f409433023af448bb0328Richard Smith 1186180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned I = FD->getFieldIndex(); 1187180f47959a066795cc0f409433023af448bb0328Richard Smith LVal.Offset += Info.Ctx.toCharUnitsFromBits(RL->getFieldOffset(I)); 1188b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LVal.addDecl(Info, E, FD); 1189180f47959a066795cc0f409433023af448bb0328Richard Smith} 1190180f47959a066795cc0f409433023af448bb0328Richard Smith 1191180f47959a066795cc0f409433023af448bb0328Richard Smith/// Get the size of the given type in char units. 1192180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool HandleSizeof(EvalInfo &Info, QualType Type, CharUnits &Size) { 1193180f47959a066795cc0f409433023af448bb0328Richard Smith // sizeof(void), __alignof__(void), sizeof(function) = 1 as a gcc 1194180f47959a066795cc0f409433023af448bb0328Richard Smith // extension. 1195180f47959a066795cc0f409433023af448bb0328Richard Smith if (Type->isVoidType() || Type->isFunctionType()) { 1196180f47959a066795cc0f409433023af448bb0328Richard Smith Size = CharUnits::One(); 1197180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1198180f47959a066795cc0f409433023af448bb0328Richard Smith } 1199180f47959a066795cc0f409433023af448bb0328Richard Smith 1200180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Type->isConstantSizeType()) { 1201180f47959a066795cc0f409433023af448bb0328Richard Smith // sizeof(vla) is not a constantexpr: C99 6.5.3.4p2. 1202b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // FIXME: Diagnostic. 1203180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1204180f47959a066795cc0f409433023af448bb0328Richard Smith } 1205180f47959a066795cc0f409433023af448bb0328Richard Smith 1206180f47959a066795cc0f409433023af448bb0328Richard Smith Size = Info.Ctx.getTypeSizeInChars(Type); 1207180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1208180f47959a066795cc0f409433023af448bb0328Richard Smith} 1209180f47959a066795cc0f409433023af448bb0328Richard Smith 1210180f47959a066795cc0f409433023af448bb0328Richard Smith/// Update a pointer value to model pointer arithmetic. 1211180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Info - Information about the ongoing evaluation. 1212b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// \param E - The expression being evaluated, for diagnostic purposes. 1213180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param LVal - The pointer value to be updated. 1214180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param EltTy - The pointee type represented by LVal. 1215180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Adjustment - The adjustment, in objects of type EltTy, to add. 1216b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleLValueArrayAdjustment(EvalInfo &Info, const Expr *E, 1217b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LValue &LVal, QualType EltTy, 1218b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith int64_t Adjustment) { 1219180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits SizeOfPointee; 1220180f47959a066795cc0f409433023af448bb0328Richard Smith if (!HandleSizeof(Info, EltTy, SizeOfPointee)) 1221180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1222180f47959a066795cc0f409433023af448bb0328Richard Smith 1223180f47959a066795cc0f409433023af448bb0328Richard Smith // Compute the new offset in the appropriate width. 1224180f47959a066795cc0f409433023af448bb0328Richard Smith LVal.Offset += Adjustment * SizeOfPointee; 1225b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LVal.adjustIndex(Info, E, Adjustment); 1226180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1227180f47959a066795cc0f409433023af448bb0328Richard Smith} 1228180f47959a066795cc0f409433023af448bb0328Richard Smith 122903f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith/// Try to evaluate the initializer for a variable declaration. 1230f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateVarDeclInit(EvalInfo &Info, const Expr *E, 1231f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const VarDecl *VD, 1232177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith CallStackFrame *Frame, CCValue &Result) { 1233d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // If this is a parameter to an active constexpr function call, perform 1234d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // argument substitution. 1235d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (const ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(VD)) { 1236f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Frame || !Frame->Arguments) { 1237dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1238177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return false; 1239f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1240177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith Result = Frame->Arguments[PVD->getFunctionScopeIndex()]; 1241177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return true; 1242d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 124303f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1244099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Dig out the initializer, and use the declaration which it's attached to. 1245099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const Expr *Init = VD->getAnyInitializer(VD); 1246099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (!Init || Init->isValueDependent()) { 1247099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1248099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return false; 1249099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 1250099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 1251180f47959a066795cc0f409433023af448bb0328Richard Smith // If we're currently evaluating the initializer of this declaration, use that 1252180f47959a066795cc0f409433023af448bb0328Richard Smith // in-flight value. 1253180f47959a066795cc0f409433023af448bb0328Richard Smith if (Info.EvaluatingDecl == VD) { 1254b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result = CCValue(Info.Ctx, *Info.EvaluatingDeclValue, 1255b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CCValue::GlobalValue()); 1256180f47959a066795cc0f409433023af448bb0328Richard Smith return !Result.isUninit(); 1257180f47959a066795cc0f409433023af448bb0328Richard Smith } 1258180f47959a066795cc0f409433023af448bb0328Richard Smith 125965ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith // Never evaluate the initializer of a weak variable. We can't be sure that 126065ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith // this is the definition which will be used. 1261f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (VD->isWeak()) { 1262dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 126365ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith return false; 1264f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 126565ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith 1266099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Check that we can fold the initializer. In C++, we will have already done 1267099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // this in the cases where it matters for conformance. 1268099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 1269099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (!VD->evaluateValue(Notes)) { 1270099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_var_init_non_constant, 1271099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Notes.size() + 1) << VD; 1272099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 1273099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.addNotes(Notes); 127447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return false; 1275099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } else if (!VD->checkInitIsICE()) { 1276099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_var_init_non_constant, 1277099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Notes.size() + 1) << VD; 1278099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 1279099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.addNotes(Notes); 1280f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 128103f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1282b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result = CCValue(Info.Ctx, *VD->getEvaluatedValue(), CCValue::GlobalValue()); 128347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return true; 128403f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith} 128503f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1286c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithstatic bool IsConstNonVolatile(QualType T) { 128703f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith Qualifiers Quals = T.getQualifiers(); 128803f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith return Quals.hasConst() && !Quals.hasVolatile(); 128903f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith} 129003f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 129159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// Get the base index of the given base class within an APValue representing 129259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// the given derived class. 129359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic unsigned getBaseIndex(const CXXRecordDecl *Derived, 129459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base) { 129559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Base = Base->getCanonicalDecl(); 129659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith unsigned Index = 0; 129759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith for (CXXRecordDecl::base_class_const_iterator I = Derived->bases_begin(), 129859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith E = Derived->bases_end(); I != E; ++I, ++Index) { 129959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (I->getType()->getAsCXXRecordDecl()->getCanonicalDecl() == Base) 130059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return Index; 130159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 130259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 130359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith llvm_unreachable("base class missing from derived class's bases list"); 130459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 130559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1306cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith/// Extract the designated sub-object of an rvalue. 1307f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool ExtractSubobject(EvalInfo &Info, const Expr *E, 1308f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith CCValue &Obj, QualType ObjType, 1309cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const SubobjectDesignator &Sub, QualType SubType) { 1310b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Sub.Invalid) 1311b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A diagnostic will have already been produced. 1312cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1313b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Sub.isOnePastTheEnd()) { 13147098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), Info.getLangOpts().CPlusPlus0x ? 1315aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_constexpr_read_past_end : 1316aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_invalid_subexpr_in_const_expr); 13177098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 13187098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 1319f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smith if (Sub.Entries.empty()) 1320cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 1321cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 1322cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith assert(!Obj.isLValue() && "extracting subobject of lvalue"); 1323cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const APValue *O = &Obj; 1324180f47959a066795cc0f409433023af448bb0328Richard Smith // Walk the designator's path to find the subobject. 1325cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith for (unsigned I = 0, N = Sub.Entries.size(); I != N; ++I) { 1326cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (ObjType->isArrayType()) { 1327180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is an array element. 1328cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(ObjType); 1329f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith assert(CAT && "vla in literal type?"); 1330cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith uint64_t Index = Sub.Entries[I].ArrayIndex; 1331f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (CAT->getSize().ule(Index)) { 13327098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Note, it should not be possible to form a pointer with a valid 13337098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // designator which points more than one past the end of the array. 13347098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), Info.getLangOpts().CPlusPlus0x ? 1335aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_constexpr_read_past_end : 1336aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_invalid_subexpr_in_const_expr); 1337cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1338f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1339cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (O->getArrayInitializedElts() > Index) 1340cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith O = &O->getArrayInitializedElt(Index); 1341cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith else 1342cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith O = &O->getArrayFiller(); 1343cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith ObjType = CAT->getElementType(); 1344180f47959a066795cc0f409433023af448bb0328Richard Smith } else if (const FieldDecl *Field = getAsField(Sub.Entries[I])) { 1345180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is a class, struct or union field. 1346180f47959a066795cc0f409433023af448bb0328Richard Smith RecordDecl *RD = ObjType->castAs<RecordType>()->getDecl(); 1347180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 1348180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *UnionField = O->getUnionField(); 1349180f47959a066795cc0f409433023af448bb0328Richard Smith if (!UnionField || 1350f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith UnionField->getCanonicalDecl() != Field->getCanonicalDecl()) { 13517098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), 13527098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith diag::note_constexpr_read_inactive_union_member) 13537098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith << Field << !UnionField << UnionField; 1354180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1355f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1356180f47959a066795cc0f409433023af448bb0328Richard Smith O = &O->getUnionValue(); 1357180f47959a066795cc0f409433023af448bb0328Richard Smith } else 1358180f47959a066795cc0f409433023af448bb0328Richard Smith O = &O->getStructField(Field->getFieldIndex()); 1359180f47959a066795cc0f409433023af448bb0328Richard Smith ObjType = Field->getType(); 13607098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 13617098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (ObjType.isVolatileQualified()) { 13627098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 13637098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // FIXME: Include a description of the path to the volatile subobject. 13647098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_ltor_volatile_obj, 1) 13657098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith << 2 << Field; 13667098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(Field->getLocation(), diag::note_declared_at); 13677098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 13687098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 13697098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 13707098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 13717098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 1372cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } else { 1373180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is a base class. 137459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Derived = ObjType->getAsCXXRecordDecl(); 137559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base = getAsBaseClass(Sub.Entries[I]); 137659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith O = &O->getStructBase(getBaseIndex(Derived, Base)); 137759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith ObjType = Info.Ctx.getRecordType(Base); 1378cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 1379180f47959a066795cc0f409433023af448bb0328Richard Smith 1380f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (O->isUninit()) { 13817098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_read_uninit); 1382180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1383f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1384cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 1385cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 1386b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj = CCValue(Info.Ctx, *O, CCValue::GlobalValue()); 1387cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 1388cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 1389cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 1390180f47959a066795cc0f409433023af448bb0328Richard Smith/// HandleLValueToRValueConversion - Perform an lvalue-to-rvalue conversion on 1391180f47959a066795cc0f409433023af448bb0328Richard Smith/// the given lvalue. This can also be used for 'lvalue-to-lvalue' conversions 1392180f47959a066795cc0f409433023af448bb0328Richard Smith/// for looking up the glvalue referred to by an entity of reference type. 1393180f47959a066795cc0f409433023af448bb0328Richard Smith/// 1394180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Info - Information about the ongoing evaluation. 1395f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// \param Conv - The expression for which we are performing the conversion. 1396f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Used for diagnostics. 1397180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Type - The type we expect this conversion to produce. 1398180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param LVal - The glvalue on which we are attempting to perform this action. 1399180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param RVal - The produced value will be placed here. 1400f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool HandleLValueToRValueConversion(EvalInfo &Info, const Expr *Conv, 1401f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith QualType Type, 1402cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const LValue &LVal, CCValue &RVal) { 14037098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // In C, an lvalue-to-rvalue conversion is never a constant expression. 14047098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!Info.getLangOpts().CPlusPlus) 14057098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.CCEDiag(Conv->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 14067098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 1407b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (LVal.Designator.Invalid) 1408b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A diagnostic will have already been produced. 1409b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1410b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 14111bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const Expr *Base = LVal.Base.dyn_cast<const Expr*>(); 1412177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith CallStackFrame *Frame = LVal.Frame; 14137098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith SourceLocation Loc = Conv->getExprLoc(); 1414c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1415f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LVal.Base) { 1416f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: Indirection through a null pointer deserves a specific diagnostic. 14177098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_invalid_subexpr_in_const_expr); 14187098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 14197098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 14207098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 14217098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // C++11 DR1311: An lvalue-to-rvalue conversion on a volatile-qualified type 14227098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // is not a constant expression (even if the object is non-volatile). We also 14237098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // apply this rule to C++98, in order to conform to the expected 'volatile' 14247098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // semantics. 14257098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Type.isVolatileQualified()) { 14267098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) 14277098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_volatile_type) << Type; 14287098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith else 14297098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 1430c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1431f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1432c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 14331bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = LVal.Base.dyn_cast<const ValueDecl*>()) { 1434c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C++98, const, non-volatile integers initialized with ICEs are ICEs. 1435c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C++11, constexpr, non-volatile variables initialized with constant 1436d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // expressions are constant expressions too. Inside constexpr functions, 1437d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // parameters are constant expressions even if they're non-const. 1438c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C, such things can also be folded, although they are not ICEs. 1439c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith const VarDecl *VD = dyn_cast<VarDecl>(D); 1440f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!VD || VD->isInvalidDecl()) { 14417098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 14420a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1443f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1444f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 14457098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // DR1313: If the object is volatile-qualified but the glvalue was not, 14467098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // behavior is undefined so the result is not a constant expression. 14471bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType VT = VD->getType(); 14487098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (VT.isVolatileQualified()) { 14497098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 14507098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_volatile_obj, 1) << 1 << VD; 14517098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 14527098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 14537098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 1454f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 14557098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 14567098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 14577098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 14587098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!isa<ParmVarDecl>(VD)) { 14597098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (VD->isConstexpr()) { 14607098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // OK, we can read this variable. 14617098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else if (VT->isIntegralOrEnumerationType()) { 14627098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!VT.isConstQualified()) { 14637098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 14647098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_non_const_int, 1) << VD; 14657098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 14667098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 14677098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 14687098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 14697098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 14707098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 14717098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else if (VT->isFloatingType() && VT.isConstQualified()) { 14727098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // We support folding of const floating-point types, in order to make 14737098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // static const data members of such types (supported as an extension) 14747098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // more useful. 14757098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 14767098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.CCEDiag(Loc, diag::note_constexpr_ltor_non_constexpr, 1) << VD; 14777098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 14787098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 14797098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.CCEDiag(Loc); 14807098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 14817098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 14827098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // FIXME: Allow folding of values of any literal type in all languages. 14837098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 14847098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_non_constexpr, 1) << VD; 14857098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 14867098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 14877098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 14887098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 14890a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1490f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 14910a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 14927098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 1493f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateVarDeclInit(Info, Conv, VD, Frame, RVal)) 1494c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1495c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 149647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith if (isa<ParmVarDecl>(VD) || !VD->getAnyInitializer()->isLValue()) 1497f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, Conv, RVal, VT, LVal.Designator, Type); 1498c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1499c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // The declaration was initialized by an lvalue, with no lvalue-to-rvalue 1500c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // conversion. This happens when the declaration and the lvalue should be 1501c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // considered synonymous, for instance when initializing an array of char 1502c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // from a string literal. Continue as if the initializer lvalue was the 1503c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // value we were originally given. 15040a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith assert(RVal.getLValueOffset().isZero() && 15050a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith "offset for lvalue init of non-reference"); 15061bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Base = RVal.getLValueBase().get<const Expr*>(); 1507177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith Frame = RVal.getLValueFrame(); 1508c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 1509c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 15107098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Volatile temporary objects cannot be read in constant expressions. 15117098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Base->getType().isVolatileQualified()) { 15127098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 15137098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_volatile_obj, 1) << 0; 15147098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(Base->getExprLoc(), diag::note_constexpr_temporary_here); 15157098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 15167098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 15177098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 15187098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 15197098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 15207098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 15210a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith // FIXME: Support PredefinedExpr, ObjCEncodeExpr, MakeStringConstant 15220a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (const StringLiteral *S = dyn_cast<StringLiteral>(Base)) { 15230a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &Designator = LVal.Designator; 1524f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Designator.Invalid || Designator.Entries.size() != 1) { 1525dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(Conv->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 15260a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1527f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 15280a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 15290a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith assert(Type->isIntegerType() && "string element not integer type"); 15309a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith uint64_t Index = Designator.Entries[0].ArrayIndex; 15317098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith const ConstantArrayType *CAT = 15327098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Ctx.getAsConstantArrayType(S->getType()); 15337098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Index >= CAT->getSize().getZExtValue()) { 15347098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Note, it should not be possible to form a pointer which points more 15357098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // than one past the end of the array without producing a prior const expr 15367098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // diagnostic. 15377098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_read_past_end); 15380a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1539f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 15400a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith APSInt Value(S->getCharByteWidth() * Info.Ctx.getCharWidth(), 15410a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Type->isUnsignedIntegerType()); 15420a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (Index < S->getLength()) 15430a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Value = S->getCodeUnit(Index); 15440a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith RVal = CCValue(Value); 15450a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 15460a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 15470a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 1548177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (Frame) { 1549cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // If this is a temporary expression with a nontrivial initializer, grab the 1550cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // value from the relevant stack frame. 1551177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith RVal = Frame->Temporaries[Base]; 1552cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } else if (const CompoundLiteralExpr *CLE 1553cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith = dyn_cast<CompoundLiteralExpr>(Base)) { 1554cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // In C99, a CompoundLiteralExpr is an lvalue, and we defer evaluating the 1555cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // initializer until now for such expressions. Such an expression can't be 1556cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // an ICE in C, so this only matters for fold. 1557c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(!Info.getLangOpts().CPlusPlus && "lvalue compound literal in c++?"); 1558cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (!Evaluate(RVal, Info, CLE->getInitializer())) 1559cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1560f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } else { 1561dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(Conv->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1562cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1563f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1564c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1565f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, Conv, RVal, Base->getType(), LVal.Designator, 1566f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Type); 1567c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 1568c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 156959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// Build an lvalue for the object argument of a member function call. 157059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic bool EvaluateObjectArgument(EvalInfo &Info, const Expr *Object, 157159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith LValue &This) { 157259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (Object->getType()->isPointerType()) 157359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return EvaluatePointer(Object, This, Info); 157459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 157559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (Object->isGLValue()) 157659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return EvaluateLValue(Object, This, Info); 157759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1578e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Object->getType()->isLiteralType()) 1579e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateTemporary(Object, This, Info); 1580e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1581e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 1582e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 1583e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1584e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// HandleMemberPointerAccess - Evaluate a member access operation and build an 1585e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// lvalue referring to the result. 1586e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// 1587e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param Info - Information about the ongoing evaluation. 1588e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param BO - The member pointer access operation. 1589e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param LV - Filled in with a reference to the resulting object. 1590e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param IncludeMember - Specifies whether the member itself is included in 1591e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// the resulting LValue subobject designator. This is not possible when 1592e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// creating a bound member function. 1593e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \return The field or method declaration to which the member pointer refers, 1594e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// or 0 if evaluation fails. 1595e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic const ValueDecl *HandleMemberPointerAccess(EvalInfo &Info, 1596e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const BinaryOperator *BO, 1597e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &LV, 1598e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool IncludeMember = true) { 1599e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(BO->getOpcode() == BO_PtrMemD || BO->getOpcode() == BO_PtrMemI); 1600e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1601e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateObjectArgument(Info, BO->getLHS(), LV)) 1602e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1603e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1604e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr MemPtr; 1605e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateMemberPointer(BO->getRHS(), MemPtr, Info)) 1606e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1607e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1608e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.mptr.oper]p6: If the second operand is the null pointer to 1609e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // member value, the behavior is undefined. 1610e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!MemPtr.getDecl()) 1611e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1612e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1613e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (MemPtr.isDerivedMember()) { 1614e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // This is a member of some derived class. Truncate LV appropriately. 1615e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // The end of the derived-to-base path for the base object must match the 1616e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // derived-to-base path for the member pointer. 1617b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (LV.Designator.MostDerivedPathLength + MemPtr.Path.size() > 1618e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.size()) 1619e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1620e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith unsigned PathLengthToMember = 1621e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.size() - MemPtr.Path.size(); 1622e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = 0, N = MemPtr.Path.size(); I != N; ++I) { 1623e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *LVDecl = getAsBaseClass( 1624e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries[PathLengthToMember + I]); 1625e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *MPDecl = MemPtr.Path[I]; 1626e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (LVDecl->getCanonicalDecl() != MPDecl->getCanonicalDecl()) 1627e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1628e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1629e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1630e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Truncate the lvalue to the appropriate derived class. 1631b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!CastToDerivedClass(Info, BO, LV, MemPtr.getContainingRecord(), 1632b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith PathLengthToMember)) 1633b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return 0; 1634e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else if (!MemPtr.Path.empty()) { 1635e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Extend the LValue path with the member pointer's path. 1636e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.reserve(LV.Designator.Entries.size() + 1637e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemPtr.Path.size() + IncludeMember); 1638e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1639e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Walk down to the appropriate base class. 1640e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType LVType = BO->getLHS()->getType(); 1641e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const PointerType *PT = LVType->getAs<PointerType>()) 1642e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LVType = PT->getPointeeType(); 1643e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *RD = LVType->getAsCXXRecordDecl(); 1644e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(RD && "member pointer access on non-class-type expression"); 1645e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // The first class in the path is that of the lvalue. 1646e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = 1, N = MemPtr.Path.size(); I != N; ++I) { 1647e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Base = MemPtr.Path[N - I - 1]; 1648b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, BO, LV, RD, Base); 1649e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RD = Base; 1650e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1651e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Finally cast to the class containing the member. 1652b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, BO, LV, RD, MemPtr.getContainingRecord()); 1653e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1654e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1655e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Add the member. Note that we cannot build bound member functions here. 1656e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (IncludeMember) { 1657e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // FIXME: Deal with IndirectFieldDecls. 1658e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const FieldDecl *FD = dyn_cast<FieldDecl>(MemPtr.getDecl()); 1659e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!FD) return 0; 1660b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, BO, LV, FD); 1661e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1662e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1663e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return MemPtr.getDecl(); 1664e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 1665e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1666e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// HandleBaseToDerivedCast - Apply the given base-to-derived cast operation on 1667e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// the provided lvalue, which currently refers to the base object. 1668e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool HandleBaseToDerivedCast(EvalInfo &Info, const CastExpr *E, 1669e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &Result) { 1670e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith SubobjectDesignator &D = Result.Designator; 1671b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.Invalid || !Result.checkNullPointer(Info, E, CSK_Derived)) 1672e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 1673e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1674e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType TargetQT = E->getType(); 1675e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const PointerType *PT = TargetQT->getAs<PointerType>()) 1676e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith TargetQT = PT->getPointeeType(); 1677b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1678b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check this cast lands within the final derived-to-base subobject path. 1679b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.MostDerivedPathLength + E->path_size() > D.Entries.size()) { 1680b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_invalid_downcast) 1681b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << D.MostDerivedType << TargetQT; 1682b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1683b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1684b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1685b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check the type of the final cast. We don't need to check the path, 1686b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // since a cast can only be formed if the path is unique. 1687b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned NewEntriesSize = D.Entries.size() - E->path_size(); 1688e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *TargetType = TargetQT->getAsCXXRecordDecl(); 1689e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *FinalType; 1690b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (NewEntriesSize == D.MostDerivedPathLength) 1691b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith FinalType = D.MostDerivedType->getAsCXXRecordDecl(); 1692b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 1693e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith FinalType = getAsBaseClass(D.Entries[NewEntriesSize - 1]); 1694b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (FinalType->getCanonicalDecl() != TargetType->getCanonicalDecl()) { 1695b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_invalid_downcast) 1696b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << D.MostDerivedType << TargetQT; 1697e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 1698b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1699e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1700e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Truncate the lvalue to the appropriate derived class. 1701b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return CastToDerivedClass(Info, E, Result, TargetType, NewEntriesSize); 170259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 170359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1704c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stumpnamespace { 1705d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smithenum EvalStmtResult { 1706d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Evaluation failed. 1707d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Failed, 1708d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Hit a 'return' statement. 1709d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Returned, 1710d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Evaluation succeeded. 1711d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Succeeded 1712d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith}; 1713d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 1714d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 1715d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith// Evaluate a statement. 1716c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic EvalStmtResult EvaluateStmt(APValue &Result, EvalInfo &Info, 1717d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith const Stmt *S) { 1718d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith switch (S->getStmtClass()) { 1719d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith default: 1720d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Failed; 1721d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 1722d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::NullStmtClass: 1723d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::DeclStmtClass: 1724d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Succeeded; 1725d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 1726c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith case Stmt::ReturnStmtClass: { 1727c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCValue CCResult; 1728c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const Expr *RetExpr = cast<ReturnStmt>(S)->getRetValue(); 1729c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!Evaluate(CCResult, Info, RetExpr) || 1730c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith !CheckConstantExpression(Info, RetExpr, CCResult, Result, 1731c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_ReturnValue)) 1732c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return ESR_Failed; 1733c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return ESR_Returned; 1734c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 1735d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 1736d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::CompoundStmtClass: { 1737d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith const CompoundStmt *CS = cast<CompoundStmt>(S); 1738d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith for (CompoundStmt::const_body_iterator BI = CS->body_begin(), 1739d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith BE = CS->body_end(); BI != BE; ++BI) { 1740d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith EvalStmtResult ESR = EvaluateStmt(Result, Info, *BI); 1741d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (ESR != ESR_Succeeded) 1742d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR; 1743d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 1744d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Succeeded; 1745d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 1746d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 1747d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 1748d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 17496180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// CheckTrivialDefaultConstructor - Check whether a constructor is a trivial 17506180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// default constructor. If so, we'll fold it whether or not it's marked as 17516180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// constexpr. If it is marked as constexpr, we will never implicitly define it, 17526180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// so we need special handling. 17536180245e9f63d2927b185ec251fb75aba30f1cacRichard Smithstatic bool CheckTrivialDefaultConstructor(EvalInfo &Info, SourceLocation Loc, 175451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXConstructorDecl *CD, 175551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool IsValueInitialization) { 17566180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (!CD->isTrivial() || !CD->isDefaultConstructor()) 17576180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return false; 17586180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 17594c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // Value-initialization does not call a trivial default constructor, so such a 17604c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // call is a core constant expression whether or not the constructor is 17614c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // constexpr. 17624c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!CD->isConstexpr() && !IsValueInitialization) { 17636180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (Info.getLangOpts().CPlusPlus0x) { 17644c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // FIXME: If DiagDecl is an implicitly-declared special member function, 17654c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // we should be much more explicit about why it's not constexpr. 17664c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Info.CCEDiag(Loc, diag::note_constexpr_invalid_function, 1) 17674c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith << /*IsConstexpr*/0 << /*IsConstructor*/1 << CD; 17684c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Info.Note(CD->getLocation(), diag::note_declared_at); 17696180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } else { 17706180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Info.CCEDiag(Loc, diag::note_invalid_subexpr_in_const_expr); 17716180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 17726180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 17736180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 17746180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith} 17756180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 1776c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith/// CheckConstexprFunction - Check that a function can be called in a constant 1777c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith/// expression. 1778c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool CheckConstexprFunction(EvalInfo &Info, SourceLocation CallLoc, 1779c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Declaration, 1780c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Definition) { 1781c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith // Can we evaluate this function call? 1782c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Definition && Definition->isConstexpr() && !Definition->isInvalidDecl()) 1783c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1784c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 1785c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 1786c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *DiagDecl = Definition ? Definition : Declaration; 1787099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // FIXME: If DiagDecl is an implicitly-declared special member function, we 1788099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // should be much more explicit about why it's not constexpr. 1789c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(CallLoc, diag::note_constexpr_invalid_function, 1) 1790c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << DiagDecl->isConstexpr() << isa<CXXConstructorDecl>(DiagDecl) 1791c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << DiagDecl; 1792c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Note(DiagDecl->getLocation(), diag::note_declared_at); 1793c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else { 1794c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(CallLoc, diag::note_invalid_subexpr_in_const_expr); 1795c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 1796c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 1797c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith} 1798c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 1799180f47959a066795cc0f409433023af448bb0328Richard Smithnamespace { 1800cd99b072e8b32075da6233cbf14ea58a5c82de4fRichard Smithtypedef SmallVector<CCValue, 8> ArgVector; 1801180f47959a066795cc0f409433023af448bb0328Richard Smith} 1802180f47959a066795cc0f409433023af448bb0328Richard Smith 1803180f47959a066795cc0f409433023af448bb0328Richard Smith/// EvaluateArgs - Evaluate the arguments to a function call. 1804180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateArgs(ArrayRef<const Expr*> Args, ArgVector &ArgValues, 1805180f47959a066795cc0f409433023af448bb0328Richard Smith EvalInfo &Info) { 1806180f47959a066795cc0f409433023af448bb0328Richard Smith for (ArrayRef<const Expr*>::iterator I = Args.begin(), E = Args.end(); 1807180f47959a066795cc0f409433023af448bb0328Richard Smith I != E; ++I) 1808180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Evaluate(ArgValues[I - Args.begin()], Info, *I)) 1809180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1810180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1811180f47959a066795cc0f409433023af448bb0328Richard Smith} 1812180f47959a066795cc0f409433023af448bb0328Richard Smith 1813d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith/// Evaluate a function call. 181408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithstatic bool HandleFunctionCall(const Expr *CallExpr, const FunctionDecl *Callee, 181508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const LValue *This, 1816f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ArrayRef<const Expr*> Args, const Stmt *Body, 1817c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith EvalInfo &Info, APValue &Result) { 1818c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!Info.CheckCallLimit(CallExpr->getExprLoc())) 1819d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return false; 1820d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 1821180f47959a066795cc0f409433023af448bb0328Richard Smith ArgVector ArgValues(Args.size()); 1822180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArgs(Args, ArgValues, Info)) 1823180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1824d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 182508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackFrame Frame(Info, CallExpr->getExprLoc(), Callee, This, 182608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith ArgValues.data()); 1827d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return EvaluateStmt(Result, Info, Body) == ESR_Returned; 1828d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 1829d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 1830180f47959a066795cc0f409433023af448bb0328Richard Smith/// Evaluate a constructor call. 1831f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool HandleConstructorCall(const Expr *CallExpr, const LValue &This, 183259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith ArrayRef<const Expr*> Args, 1833180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXConstructorDecl *Definition, 183451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith EvalInfo &Info, APValue &Result) { 1835c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!Info.CheckCallLimit(CallExpr->getExprLoc())) 1836180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1837180f47959a066795cc0f409433023af448bb0328Richard Smith 1838180f47959a066795cc0f409433023af448bb0328Richard Smith ArgVector ArgValues(Args.size()); 1839180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArgs(Args, ArgValues, Info)) 1840180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1841180f47959a066795cc0f409433023af448bb0328Richard Smith 184208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackFrame Frame(Info, CallExpr->getExprLoc(), Definition, 184308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith &This, ArgValues.data()); 1844180f47959a066795cc0f409433023af448bb0328Richard Smith 1845180f47959a066795cc0f409433023af448bb0328Richard Smith // If it's a delegating constructor, just delegate. 1846180f47959a066795cc0f409433023af448bb0328Richard Smith if (Definition->isDelegatingConstructor()) { 1847180f47959a066795cc0f409433023af448bb0328Richard Smith CXXConstructorDecl::init_const_iterator I = Definition->init_begin(); 1848180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateConstantExpression(Result, Info, This, (*I)->getInit()); 1849180f47959a066795cc0f409433023af448bb0328Richard Smith } 1850180f47959a066795cc0f409433023af448bb0328Richard Smith 1851610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // For a trivial copy or move constructor, perform an APValue copy. This is 1852610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // essential for unions, where the operations performed by the constructor 1853610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // cannot be represented by ctor-initializers. 1854180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *RD = Definition->getParent(); 1855610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith if (Definition->isDefaulted() && 1856610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith ((Definition->isCopyConstructor() && RD->hasTrivialCopyConstructor()) || 1857610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith (Definition->isMoveConstructor() && RD->hasTrivialMoveConstructor()))) { 1858610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith LValue RHS; 1859610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith RHS.setFrom(ArgValues[0]); 1860610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith CCValue Value; 1861610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith return HandleLValueToRValueConversion(Info, Args[0], Args[0]->getType(), 1862610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith RHS, Value) && 1863610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith CheckConstantExpression(Info, CallExpr, Value, Result); 1864610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith } 1865610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith 1866610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // Reserve space for the struct members. 186751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!RD->isUnion() && Result.isUninit()) 1868180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitStruct(), RD->getNumBases(), 1869180f47959a066795cc0f409433023af448bb0328Richard Smith std::distance(RD->field_begin(), RD->field_end())); 1870180f47959a066795cc0f409433023af448bb0328Richard Smith 1871180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 1872180f47959a066795cc0f409433023af448bb0328Richard Smith 1873180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned BasesSeen = 0; 1874180f47959a066795cc0f409433023af448bb0328Richard Smith#ifndef NDEBUG 1875180f47959a066795cc0f409433023af448bb0328Richard Smith CXXRecordDecl::base_class_const_iterator BaseIt = RD->bases_begin(); 1876180f47959a066795cc0f409433023af448bb0328Richard Smith#endif 1877180f47959a066795cc0f409433023af448bb0328Richard Smith for (CXXConstructorDecl::init_const_iterator I = Definition->init_begin(), 1878180f47959a066795cc0f409433023af448bb0328Richard Smith E = Definition->init_end(); I != E; ++I) { 1879180f47959a066795cc0f409433023af448bb0328Richard Smith if ((*I)->isBaseInitializer()) { 1880180f47959a066795cc0f409433023af448bb0328Richard Smith QualType BaseType((*I)->getBaseClass(), 0); 1881180f47959a066795cc0f409433023af448bb0328Richard Smith#ifndef NDEBUG 1882180f47959a066795cc0f409433023af448bb0328Richard Smith // Non-virtual base classes are initialized in the order in the class 1883180f47959a066795cc0f409433023af448bb0328Richard Smith // definition. We cannot have a virtual base class for a literal type. 1884180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!BaseIt->isVirtual() && "virtual base for literal type"); 1885180f47959a066795cc0f409433023af448bb0328Richard Smith assert(Info.Ctx.hasSameType(BaseIt->getType(), BaseType) && 1886180f47959a066795cc0f409433023af448bb0328Richard Smith "base class initializers not in expected order"); 1887180f47959a066795cc0f409433023af448bb0328Richard Smith ++BaseIt; 1888180f47959a066795cc0f409433023af448bb0328Richard Smith#endif 1889180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 1890b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, (*I)->getInit(), Subobject, RD, 1891180f47959a066795cc0f409433023af448bb0328Richard Smith BaseType->getAsCXXRecordDecl(), &Layout); 1892180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateConstantExpression(Result.getStructBase(BasesSeen++), Info, 1893180f47959a066795cc0f409433023af448bb0328Richard Smith Subobject, (*I)->getInit())) 1894180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1895180f47959a066795cc0f409433023af448bb0328Richard Smith } else if (FieldDecl *FD = (*I)->getMember()) { 1896180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 1897b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, (*I)->getInit(), Subobject, FD, &Layout); 1898180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 1899180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(FD); 1900c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!EvaluateConstantExpression(Result.getUnionValue(), Info, Subobject, 1901c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith (*I)->getInit(), CCEK_MemberInit)) 1902180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1903180f47959a066795cc0f409433023af448bb0328Richard Smith } else if (!EvaluateConstantExpression( 1904180f47959a066795cc0f409433023af448bb0328Richard Smith Result.getStructField(FD->getFieldIndex()), 1905c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info, Subobject, (*I)->getInit(), CCEK_MemberInit)) 1906180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1907180f47959a066795cc0f409433023af448bb0328Richard Smith } else { 1908180f47959a066795cc0f409433023af448bb0328Richard Smith // FIXME: handle indirect field initializers 1909dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag((*I)->getInit()->getExprLoc(), 1910f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith diag::note_invalid_subexpr_in_const_expr); 1911180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1912180f47959a066795cc0f409433023af448bb0328Richard Smith } 1913180f47959a066795cc0f409433023af448bb0328Richard Smith } 1914180f47959a066795cc0f409433023af448bb0328Richard Smith 1915180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1916180f47959a066795cc0f409433023af448bb0328Richard Smith} 1917180f47959a066795cc0f409433023af448bb0328Richard Smith 1918d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smithnamespace { 1919770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass HasSideEffect 19208cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ConstStmtVisitor<HasSideEffect, bool> { 19211e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith const ASTContext &Ctx; 1922c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stumppublic: 1923c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 19241e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith HasSideEffect(const ASTContext &C) : Ctx(C) {} 1925c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 1926c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // Unhandled nodes conservatively default to having side effects. 19278cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStmt(const Stmt *S) { 1928c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 1929c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 1930c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 19318cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitParenExpr(const ParenExpr *E) { return Visit(E->getSubExpr()); } 19328cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitGenericSelectionExpr(const GenericSelectionExpr *E) { 1933f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne return Visit(E->getResultExpr()); 1934f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne } 19358cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitDeclRefExpr(const DeclRefExpr *E) { 19361e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 1937c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 1938c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return false; 1939c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 1940f85e193739c953358c865005855253af4f68a497John McCall bool VisitObjCIvarRefExpr(const ObjCIvarRefExpr *E) { 19411e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 1942f85e193739c953358c865005855253af4f68a497John McCall return true; 1943f85e193739c953358c865005855253af4f68a497John McCall return false; 1944f85e193739c953358c865005855253af4f68a497John McCall } 1945f85e193739c953358c865005855253af4f68a497John McCall bool VisitBlockDeclRefExpr (const BlockDeclRefExpr *E) { 19461e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 1947f85e193739c953358c865005855253af4f68a497John McCall return true; 1948f85e193739c953358c865005855253af4f68a497John McCall return false; 1949f85e193739c953358c865005855253af4f68a497John McCall } 1950f85e193739c953358c865005855253af4f68a497John McCall 1951c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // We don't want to evaluate BlockExprs multiple times, as they generate 1952c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // a ton of code. 19538cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBlockExpr(const BlockExpr *E) { return true; } 19548cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitPredefinedExpr(const PredefinedExpr *E) { return false; } 19558cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) 1956c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump { return Visit(E->getInitializer()); } 19578cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitMemberExpr(const MemberExpr *E) { return Visit(E->getBase()); } 19588cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitIntegerLiteral(const IntegerLiteral *E) { return false; } 19598cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitFloatingLiteral(const FloatingLiteral *E) { return false; } 19608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStringLiteral(const StringLiteral *E) { return false; } 19618cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCharacterLiteral(const CharacterLiteral *E) { return false; } 19628cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E) 1963f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne { return false; } 19648cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E) 1965980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump { return Visit(E->getLHS()) || Visit(E->getRHS()); } 19668cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitChooseExpr(const ChooseExpr *E) 19671e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith { return Visit(E->getChosenSubExpr(Ctx)); } 19688cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E) { return Visit(E->getSubExpr()); } 19698cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBinAssign(const BinaryOperator *E) { return true; } 19708cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundAssignOperator(const BinaryOperator *E) { return true; } 19718cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBinaryOperator(const BinaryOperator *E) 1972980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump { return Visit(E->getLHS()) || Visit(E->getRHS()); } 19738cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPreInc(const UnaryOperator *E) { return true; } 19748cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPostInc(const UnaryOperator *E) { return true; } 19758cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPreDec(const UnaryOperator *E) { return true; } 19768cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPostDec(const UnaryOperator *E) { return true; } 19778cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryDeref(const UnaryOperator *E) { 19781e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 1979c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 1980980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump return Visit(E->getSubExpr()); 1981c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 19828cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryOperator(const UnaryOperator *E) { return Visit(E->getSubExpr()); } 1983363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner 1984363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner // Has side effects if any element does. 19858cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitInitListExpr(const InitListExpr *E) { 1986363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner for (unsigned i = 0, e = E->getNumInits(); i != e; ++i) 1987363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner if (Visit(E->getInit(i))) return true; 19888cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (const Expr *filler = E->getArrayFiller()) 19894423ac0282acb8ba801eb05b38712438dc0c1e3eArgyrios Kyrtzidis return Visit(filler); 1990363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner return false; 1991363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner } 1992ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor 19938cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitSizeOfPackExpr(const SizeOfPackExpr *) { return false; } 1994c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump}; 1995c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 199656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCallclass OpaqueValueEvaluation { 199756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall EvalInfo &info; 199856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall OpaqueValueExpr *opaqueValue; 199956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 200056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCallpublic: 200156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall OpaqueValueEvaluation(EvalInfo &info, OpaqueValueExpr *opaqueValue, 200256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall Expr *value) 200356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall : info(info), opaqueValue(opaqueValue) { 200456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 200556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall // If evaluation fails, fail immediately. 20061e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!Evaluate(info.OpaqueValues[opaqueValue], info, value)) { 200756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall this->opaqueValue = 0; 200856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall return; 200956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 201056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 201156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 201256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall bool hasError() const { return opaqueValue == 0; } 201356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 201456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ~OpaqueValueEvaluation() { 20151e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith // FIXME: This will not work for recursive constexpr functions using opaque 20161e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith // values. Restore the former value. 201756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (opaqueValue) info.OpaqueValues.erase(opaqueValue); 201856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 201956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall}; 202056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 2021c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump} // end anonymous namespace 2022c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 20234efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 20248cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne// Generic Evaluation 20258cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne//===----------------------------------------------------------------------===// 20268cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournenamespace { 20278cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2028f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith// FIXME: RetTy is always bool. Remove it. 2029f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithtemplate <class Derived, typename RetTy=bool> 20308cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneclass ExprEvaluatorBase 20318cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ConstStmtVisitor<Derived, RetTy> { 20328cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneprivate: 203347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith RetTy DerivedSuccess(const CCValue &V, const Expr *E) { 20348cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return static_cast<Derived*>(this)->Success(V, E); 20358cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 203651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RetTy DerivedZeroInitialization(const Expr *E) { 203751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return static_cast<Derived*>(this)->ZeroInitialization(E); 2038f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 20398cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 20408cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneprotected: 20418cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne EvalInfo &Info; 20428cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne typedef ConstStmtVisitor<Derived, RetTy> StmtVisitorTy; 20438cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne typedef ExprEvaluatorBase ExprEvaluatorBaseTy; 20448cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2045dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith OptionalDiagnostic CCEDiag(const Expr *E, diag::kind D) { 2046d5093420308784e31071c8cd723a58d74159f393Richard Smith return Info.CCEDiag(E->getExprLoc(), D); 2047f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2048f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 2049f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// Report an evaluation error. This should only be called when an error is 2050f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// first discovered. When propagating an error, just return false. 2051f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool Error(const Expr *E, diag::kind D) { 2052dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), D); 2053f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2054f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2055f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool Error(const Expr *E) { 2056f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_invalid_subexpr_in_const_expr); 2057f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2058f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 205951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RetTy ZeroInitialization(const Expr *E) { return Error(E); } 2060f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 20618cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournepublic: 20628cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne ExprEvaluatorBase(EvalInfo &Info) : Info(Info) {} 20638cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 20648cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitStmt(const Stmt *) { 2065b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Expression evaluator should not be called on stmts"); 20668cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 20678cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitExpr(const Expr *E) { 2068f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 20698cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 20708cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 20718cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitParenExpr(const ParenExpr *E) 20728cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 20738cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitUnaryExtension(const UnaryOperator *E) 20748cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 20758cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitUnaryPlus(const UnaryOperator *E) 20768cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 20778cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitChooseExpr(const ChooseExpr *E) 20788cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getChosenSubExpr(Info.Ctx)); } 20798cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitGenericSelectionExpr(const GenericSelectionExpr *E) 20808cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getResultExpr()); } 208191a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall RetTy VisitSubstNonTypeTemplateParmExpr(const SubstNonTypeTemplateParmExpr *E) 208291a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall { return StmtVisitorTy::Visit(E->getReplacement()); } 20833d75ca836205856077c18e30e9447accbd85f751Richard Smith RetTy VisitCXXDefaultArgExpr(const CXXDefaultArgExpr *E) 20843d75ca836205856077c18e30e9447accbd85f751Richard Smith { return StmtVisitorTy::Visit(E->getExpr()); } 2085bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith // We cannot create any objects for which cleanups are required, so there is 2086bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith // nothing to do here; all cleanups must come from unevaluated subexpressions. 2087bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith RetTy VisitExprWithCleanups(const ExprWithCleanups *E) 2088bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith { return StmtVisitorTy::Visit(E->getSubExpr()); } 20898cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2090c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith RetTy VisitCXXReinterpretCastExpr(const CXXReinterpretCastExpr *E) { 2091c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 0; 2092c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith return static_cast<Derived*>(this)->VisitCastExpr(E); 2093c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith } 2094c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith RetTy VisitCXXDynamicCastExpr(const CXXDynamicCastExpr *E) { 2095c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 1; 2096c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith return static_cast<Derived*>(this)->VisitCastExpr(E); 2097c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith } 2098c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 2099e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RetTy VisitBinaryOperator(const BinaryOperator *E) { 2100e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getOpcode()) { 2101e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2102f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2103e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2104e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_Comma: 2105e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith VisitIgnoredValue(E->getLHS()); 2106e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return StmtVisitorTy::Visit(E->getRHS()); 2107e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2108e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemD: 2109e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemI: { 2110e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue Obj; 2111e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!HandleMemberPointerAccess(Info, E, Obj)) 2112e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2113e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith CCValue Result; 2114f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), Obj, Result)) 2115e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2116e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DerivedSuccess(Result, E); 2117e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2118e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2119e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2120e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 21218cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitBinaryConditionalOperator(const BinaryConditionalOperator *E) { 21228cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne OpaqueValueEvaluation opaque(Info, E->getOpaqueValue(), E->getCommon()); 21238cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (opaque.hasError()) 2124f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 21258cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 21268cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool cond; 2127c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateAsBooleanCondition(E->getCond(), cond, Info)) 2128f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 21298cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 21308cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return StmtVisitorTy::Visit(cond ? E->getTrueExpr() : E->getFalseExpr()); 21318cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 21328cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 21338cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitConditionalOperator(const ConditionalOperator *E) { 21348cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool BoolResult; 2135c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateAsBooleanCondition(E->getCond(), BoolResult, Info)) 2136f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 21378cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2138c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Expr *EvalExpr = BoolResult ? E->getTrueExpr() : E->getFalseExpr(); 21398cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return StmtVisitorTy::Visit(EvalExpr); 21408cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 21418cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 21428cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitOpaqueValueExpr(const OpaqueValueExpr *E) { 214347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith const CCValue *Value = Info.getOpaqueValue(E); 214442786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (!Value) { 214542786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis const Expr *Source = E->getSourceExpr(); 214642786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (!Source) 2147f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 214842786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (Source == E) { // sanity checking. 214942786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis assert(0 && "OpaqueValueExpr recursively refers to itself"); 2150f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 215142786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis } 215242786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis return StmtVisitorTy::Visit(Source); 215342786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis } 215447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return DerivedSuccess(*Value, E); 21558cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 2156f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 2157d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith RetTy VisitCallExpr(const CallExpr *E) { 2158e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const Expr *Callee = E->getCallee()->IgnoreParens(); 2159d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith QualType CalleeType = Callee->getType(); 2160d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 21616142ca7790aa09a6e13592b70f142cc4bbcadcaeDevang Patel const FunctionDecl *FD = 0; 216259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith LValue *This = 0, ThisVal; 216359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 216459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 216559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Extract function decl and 'this' pointer from the callee. 216659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (CalleeType->isSpecificBuiltinType(BuiltinType::BoundMember)) { 2167f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const ValueDecl *Member = 0; 2168e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const MemberExpr *ME = dyn_cast<MemberExpr>(Callee)) { 2169e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Explicit bound member calls, such as x.f() or p->g(); 2170e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateObjectArgument(Info, ME->getBase(), ThisVal)) 2171f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2172f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Member = ME->getMemberDecl(); 2173e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith This = &ThisVal; 2174e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else if (const BinaryOperator *BE = dyn_cast<BinaryOperator>(Callee)) { 2175e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Indirect bound member calls ('.*' or '->*'). 2176f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Member = HandleMemberPointerAccess(Info, BE, ThisVal, false); 2177f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Member) return false; 2178e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith This = &ThisVal; 2179e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else 2180f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 2181f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 2182f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith FD = dyn_cast<FunctionDecl>(Member); 2183f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!FD) 2184f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 218559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } else if (CalleeType->isFunctionPointerType()) { 2186b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LValue Call; 2187b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!EvaluatePointer(Callee, Call, Info)) 2188f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 218959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2190b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Call.getLValueOffset().isZero()) 2191f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 21921bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith FD = dyn_cast_or_null<FunctionDecl>( 21931bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Call.getLValueBase().dyn_cast<const ValueDecl*>()); 219459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!FD) 2195f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 219659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 219759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Overloaded operator calls to member functions are represented as normal 219859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // calls with '*this' as the first argument. 219959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 220059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (MD && !MD->isStatic()) { 2201f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: When selecting an implicit conversion for an overloaded 2202f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // operator delete, we sometimes try to evaluate calls to conversion 2203f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // operators without a 'this' parameter! 2204f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Args.empty()) 2205f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2206f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 220759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!EvaluateObjectArgument(Info, Args[0], ThisVal)) 220859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return false; 220959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith This = &ThisVal; 221059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Args = Args.slice(1); 221159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 2212d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 221359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Don't call function pointers which have been cast to some other type. 221459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!Info.Ctx.hasSameType(CalleeType->getPointeeType(), FD->getType())) 2215f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 221659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } else 2217f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2218d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2219c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Definition = 0; 2220d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith Stmt *Body = FD->getBody(Definition); 222169c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith APValue Result; 2222d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2223c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition) || 222408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith !HandleFunctionCall(E, Definition, This, Args, Body, Info, Result)) 2225f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2226d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2227b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return DerivedSuccess(CCValue(Info.Ctx, Result, CCValue::GlobalValue()), E); 2228d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2229d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2230c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RetTy VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { 2231c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return StmtVisitorTy::Visit(E->getInitializer()); 2232c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2233f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitInitListExpr(const InitListExpr *E) { 223471523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman if (E->getNumInits() == 0) 223571523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman return DerivedZeroInitialization(E); 223671523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman if (E->getNumInits() == 1) 223771523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman return StmtVisitorTy::Visit(E->getInit(0)); 2238f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2239f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2240f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) { 224151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2242f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2243f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) { 224451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2245f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2246e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RetTy VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) { 224751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2248e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2249f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 2250180f47959a066795cc0f409433023af448bb0328Richard Smith /// A member expression where the object is a prvalue is itself a prvalue. 2251180f47959a066795cc0f409433023af448bb0328Richard Smith RetTy VisitMemberExpr(const MemberExpr *E) { 2252180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!E->isArrow() && "missing call to bound member function?"); 2253180f47959a066795cc0f409433023af448bb0328Richard Smith 2254180f47959a066795cc0f409433023af448bb0328Richard Smith CCValue Val; 2255180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Evaluate(Val, Info, E->getBase())) 2256180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2257180f47959a066795cc0f409433023af448bb0328Richard Smith 2258180f47959a066795cc0f409433023af448bb0328Richard Smith QualType BaseTy = E->getBase()->getType(); 2259180f47959a066795cc0f409433023af448bb0328Richard Smith 2260180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl()); 2261f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!FD) return Error(E); 2262180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!FD->getType()->isReferenceType() && "prvalue reference?"); 2263180f47959a066795cc0f409433023af448bb0328Richard Smith assert(BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() == 2264180f47959a066795cc0f409433023af448bb0328Richard Smith FD->getParent()->getCanonicalDecl() && "record / field mismatch"); 2265180f47959a066795cc0f409433023af448bb0328Richard Smith 2266b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator Designator(BaseTy); 2267b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addDeclUnchecked(FD); 2268180f47959a066795cc0f409433023af448bb0328Richard Smith 2269f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, E, Val, BaseTy, Designator, E->getType()) && 2270180f47959a066795cc0f409433023af448bb0328Richard Smith DerivedSuccess(Val, E); 2271180f47959a066795cc0f409433023af448bb0328Richard Smith } 2272180f47959a066795cc0f409433023af448bb0328Richard Smith 2273c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RetTy VisitCastExpr(const CastExpr *E) { 2274c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith switch (E->getCastKind()) { 2275c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith default: 2276c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith break; 2277c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 22787a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 22797a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 2280c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case CK_NoOp: 22817d580a4e9e47dffc3c17aa2b957ac57ca3c4e451Richard Smith case CK_UserDefinedConversion: 2282c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return StmtVisitorTy::Visit(E->getSubExpr()); 2283c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2284c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case CK_LValueToRValue: { 2285c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LValue LVal; 2286f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateLValue(E->getSubExpr(), LVal, Info)) 2287f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2288f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith CCValue RVal; 2289f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), LVal, RVal)) 2290f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2291f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return DerivedSuccess(RVal, E); 2292c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2293c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2294c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2295f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2296c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2297c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 22988327fad71da34492d82c532f42a58cb4baff81a3Richard Smith /// Visit a value which is evaluated, but whose value is ignored. 22998327fad71da34492d82c532f42a58cb4baff81a3Richard Smith void VisitIgnoredValue(const Expr *E) { 230047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue Scratch; 23018327fad71da34492d82c532f42a58cb4baff81a3Richard Smith if (!Evaluate(Scratch, Info, E)) 23028327fad71da34492d82c532f42a58cb4baff81a3Richard Smith Info.EvalStatus.HasSideEffects = true; 23038327fad71da34492d82c532f42a58cb4baff81a3Richard Smith } 23048cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne}; 23058cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 23068cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne} 23078cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 23088cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne//===----------------------------------------------------------------------===// 2309e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Common base class for lvalue and temporary evaluation. 2310e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 2311e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 2312e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithtemplate<class Derived> 2313e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass LValueExprEvaluatorBase 2314e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public ExprEvaluatorBase<Derived, bool> { 2315e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithprotected: 2316e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &Result; 2317e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef LValueExprEvaluatorBase LValueExprEvaluatorBaseTy; 2318e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef ExprEvaluatorBase<Derived, bool> ExprEvaluatorBaseTy; 2319e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2320e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(APValue::LValueBase B) { 2321e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.set(B); 2322e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2323e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2324e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2325e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 2326e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBase(EvalInfo &Info, LValue &Result) : 2327e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ExprEvaluatorBaseTy(Info), Result(Result) {} 2328e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2329e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(const CCValue &V, const Expr *E) { 2330e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.setFrom(V); 2331e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2332e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2333e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2334e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitMemberExpr(const MemberExpr *E) { 2335e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Handle non-static data members. 2336e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType BaseTy; 2337e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isArrow()) { 2338e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluatePointer(E->getBase(), Result, this->Info)) 2339e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2340e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith BaseTy = E->getBase()->getType()->getAs<PointerType>()->getPointeeType(); 2341c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else if (E->getBase()->isRValue()) { 2342af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith assert(E->getBase()->getType()->isRecordType()); 2343c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!EvaluateTemporary(E->getBase(), Result, this->Info)) 2344c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 2345c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith BaseTy = E->getBase()->getType(); 2346e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else { 2347e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!this->Visit(E->getBase())) 2348e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2349e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith BaseTy = E->getBase()->getType(); 2350e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2351e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2352e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl()); 2353e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // FIXME: Handle IndirectFieldDecls 2354f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!FD) return this->Error(E); 2355e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() == 2356e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith FD->getParent()->getCanonicalDecl() && "record / field mismatch"); 2357e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith (void)BaseTy; 2358e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2359b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(this->Info, E, Result, FD); 2360e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2361e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (FD->getType()->isReferenceType()) { 2362e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith CCValue RefValue; 2363f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(this->Info, E, FD->getType(), Result, 2364e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RefValue)) 2365e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2366e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success(RefValue, E); 2367e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2368e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2369e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2370e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2371e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitBinaryOperator(const BinaryOperator *E) { 2372e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getOpcode()) { 2373e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2374e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 2375e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2376e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemD: 2377e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemI: 2378e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleMemberPointerAccess(this->Info, E, Result); 2379e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2380e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2381e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2382e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E) { 2383e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 2384e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2385e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 2386e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2387e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_DerivedToBase: 2388e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_UncheckedDerivedToBase: { 2389e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!this->Visit(E->getSubExpr())) 2390e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2391e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2392e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Now figure out the necessary offset to add to the base LV to get from 2393e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // the derived class to the base class. 2394e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType Type = E->getSubExpr()->getType(); 2395e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2396e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 2397e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 2398b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleLValueBase(this->Info, E, Result, Type->getAsCXXRecordDecl(), 2399e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith *PathI)) 2400e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2401e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Type = (*PathI)->getType(); 2402e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2403e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2404e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2405e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2406e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2407e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2408e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 2409e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 2410e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2411e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 24124efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman// LValue Evaluation 2413c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 2414c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// This is used for evaluating lvalues (in C and C++), xvalues (in C++11), 2415c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// function designators (in C), decl references to void objects (in C), and 2416c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// temporaries (if building with -Wno-address-of-temporary). 2417c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 2418c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// LValue evaluation produces values comprising a base expression of one of the 2419c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// following types: 24201bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Declarations 24211bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * VarDecl 24221bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * FunctionDecl 24231bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Literals 2424c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * CompoundLiteralExpr in C 2425c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * StringLiteral 242647d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith// * CXXTypeidExpr 2427c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * PredefinedExpr 2428180f47959a066795cc0f409433023af448bb0328Richard Smith// * ObjCStringLiteralExpr 2429c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * ObjCEncodeExpr 2430c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * AddrLabelExpr 2431c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * BlockExpr 2432c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * CallExpr for a MakeStringConstant builtin 24331bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Locals and temporaries 24341bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * Any Expr, with a Frame indicating the function in which the temporary was 24351bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// evaluated. 24361bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// plus an offset in bytes. 24374efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 24384efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedmannamespace { 2439770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass LValueExprEvaluator 2440e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public LValueExprEvaluatorBase<LValueExprEvaluator> { 24414efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedmanpublic: 2442e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluator(EvalInfo &Info, LValue &Result) : 2443e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBaseTy(Info, Result) {} 24441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2445c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith bool VisitVarDecl(const Expr *E, const VarDecl *VD); 2446c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 24478cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitDeclRefExpr(const DeclRefExpr *E); 24488cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitPredefinedExpr(const PredefinedExpr *E) { return Success(E); } 2449bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith bool VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E); 24508cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E); 24518cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitMemberExpr(const MemberExpr *E); 24528cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStringLiteral(const StringLiteral *E) { return Success(E); } 24538cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitObjCEncodeExpr(const ObjCEncodeExpr *E) { return Success(E); } 245447d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith bool VisitCXXTypeidExpr(const CXXTypeidExpr *E); 24558cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E); 24568cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryDeref(const UnaryOperator *E); 24578cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 24588cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E) { 245926bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson switch (E->getCastKind()) { 246026bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson default: 2461e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitCastExpr(E); 246226bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson 2463db924224b51b153f24fbe492102d4edebcbbb7f4Eli Friedman case CK_LValueBitCast: 2464c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith this->CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 24650a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (!Visit(E->getSubExpr())) 24660a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 24670a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Result.Designator.setInvalid(); 24680a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 2469db924224b51b153f24fbe492102d4edebcbbb7f4Eli Friedman 2470e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerived: 2471180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Visit(E->getSubExpr())) 2472180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2473e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleBaseToDerivedCast(Info, E, Result); 247426bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson } 247526bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson } 2476cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 2477ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman // FIXME: Missing: __real__, __imag__ 24788cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 24794efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman}; 24804efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} // end anonymous namespace 24814efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 2482c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// Evaluate an expression as an lvalue. This can be legitimately called on 2483c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// expressions which are not glvalues, in a few cases: 2484c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * function designators in C, 2485c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * "extern void" objects, 2486c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * temporaries, if building with -Wno-address-of-temporary. 2487efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluateLValue(const Expr* E, LValue& Result, EvalInfo &Info) { 2488c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert((E->isGLValue() || E->getType()->isFunctionType() || 2489c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith E->getType()->isVoidType() || isa<CXXTemporaryObjectExpr>(E)) && 2490c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith "can't evaluate expression as an lvalue"); 24918cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return LValueExprEvaluator(Info, Result).Visit(E); 24924efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 24934efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 24948cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitDeclRefExpr(const DeclRefExpr *E) { 24951bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(E->getDecl())) 24961bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(FD); 24971bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(E->getDecl())) 2498c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return VisitVarDecl(E, VD); 2499c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Error(E); 2500c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 2501436c8898cd1c93c5bacd3fcc4ac586bc5cd77062Richard Smith 2502c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithbool LValueExprEvaluator::VisitVarDecl(const Expr *E, const VarDecl *VD) { 2503177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (!VD->getType()->isReferenceType()) { 2504177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (isa<ParmVarDecl>(VD)) { 25051bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.set(VD, Info.CurrentCall); 2506177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return true; 2507177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith } 25081bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(VD); 2509177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith } 251050c39ea4858265f3f5f42a0c624557ce2281936bEli Friedman 251147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue V; 2512f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateVarDeclInit(Info, E, VD, Info.CurrentCall, V)) 2513f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2514f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(V, E); 251535873c49adad211ff466e34342a52665742794f5Anders Carlsson} 251635873c49adad211ff466e34342a52665742794f5Anders Carlsson 2517bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smithbool LValueExprEvaluator::VisitMaterializeTemporaryExpr( 2518bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith const MaterializeTemporaryExpr *E) { 2519e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->GetTemporaryExpr()->isRValue()) { 2520af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith if (E->getType()->isRecordType()) 2521e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateTemporary(E->GetTemporaryExpr(), Result, Info); 2522e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2523e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.set(E, Info.CurrentCall); 2524e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateConstantExpression(Info.CurrentCall->Temporaries[E], Info, 2525e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result, E->GetTemporaryExpr()); 2526e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2527e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2528e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Materialization of an lvalue temporary occurs when we need to force a copy 2529e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // (for instance, if it's a bitfield). 2530e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // FIXME: The AST should contain an lvalue-to-rvalue node for such cases. 2531e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->GetTemporaryExpr())) 2532e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2533f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), Result, 2534e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Info.CurrentCall->Temporaries[E])) 2535e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 25361bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.set(E, Info.CurrentCall); 2537e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2538bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith} 2539bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 25408cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool 25418cad3046be06ea73ff8892d947697a21d7a440d3Peter CollingbourneLValueExprEvaluator::VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { 2542c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(!Info.getLangOpts().CPlusPlus && "lvalue compound literal in c++?"); 2543c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // Defer visiting the literal until the lvalue-to-rvalue conversion. We can 2544c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // only see this when folding in C, so there's no standard to follow here. 2545efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 25464efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 25474efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 254847d2145675099893d702be4bc06bd9f26d8ddd13Richard Smithbool LValueExprEvaluator::VisitCXXTypeidExpr(const CXXTypeidExpr *E) { 254947d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith if (E->isTypeOperand()) 255047d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return Success(E); 255147d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith CXXRecordDecl *RD = E->getExprOperand()->getType()->getAsCXXRecordDecl(); 255247d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith if (RD && RD->isPolymorphic()) { 255347d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_typeid_polymorphic) 255447d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith << E->getExprOperand()->getType() 255547d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith << E->getExprOperand()->getSourceRange(); 255647d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return false; 255747d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith } 255847d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return Success(E); 255947d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith} 256047d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith 25618cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitMemberExpr(const MemberExpr *E) { 2562c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // Handle static data members. 2563c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(E->getMemberDecl())) { 2564c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith VisitIgnoredValue(E->getBase()); 2565c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return VisitVarDecl(E, VD); 2566c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2567c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2568d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // Handle static member functions. 2569d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(E->getMemberDecl())) { 2570d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (MD->isStatic()) { 2571d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith VisitIgnoredValue(E->getBase()); 25721bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(MD); 2573d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2574d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2575d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2576180f47959a066795cc0f409433023af448bb0328Richard Smith // Handle non-static data members. 2577e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitMemberExpr(E); 25784efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 25794efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 25808cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitArraySubscriptExpr(const ArraySubscriptExpr *E) { 2581c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // FIXME: Deal with vectors as array subscript bases. 2582c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->getBase()->getType()->isVectorType()) 2583f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2584c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 25853068d117951a8df54bae9db039b56201ab10962bAnders Carlsson if (!EvaluatePointer(E->getBase(), Result, Info)) 2586efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 25871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 25883068d117951a8df54bae9db039b56201ab10962bAnders Carlsson APSInt Index; 25893068d117951a8df54bae9db039b56201ab10962bAnders Carlsson if (!EvaluateInteger(E->getIdx(), Index, Info)) 2590efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 2591180f47959a066795cc0f409433023af448bb0328Richard Smith int64_t IndexValue 2592180f47959a066795cc0f409433023af448bb0328Richard Smith = Index.isSigned() ? Index.getSExtValue() 2593180f47959a066795cc0f409433023af448bb0328Richard Smith : static_cast<int64_t>(Index.getZExtValue()); 25943068d117951a8df54bae9db039b56201ab10962bAnders Carlsson 2595b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleLValueArrayAdjustment(Info, E, Result, E->getType(), IndexValue); 25963068d117951a8df54bae9db039b56201ab10962bAnders Carlsson} 25974efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 25988cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitUnaryDeref(const UnaryOperator *E) { 2599efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return EvaluatePointer(E->getSubExpr(), Result, Info); 2600e8761c8fe2ee6b628104a0885f49fd3c21c08a4fEli Friedman} 2601e8761c8fe2ee6b628104a0885f49fd3c21c08a4fEli Friedman 26024efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 2603f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner// Pointer Evaluation 2604f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 2605f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 2606c754aa62643e66ab967ca32ae8b0b3fc419bba25Anders Carlssonnamespace { 2607770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass PointerExprEvaluator 26088cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<PointerExprEvaluator, bool> { 2609efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue &Result; 2610efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 26118cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool Success(const Expr *E) { 26121bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.set(E); 2613efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 2614efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } 26152bad1687fe6f00e10767a691a33b070b151902b6Anders Carlssonpublic: 26161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2617efdb83e26f9a1fd2566afe54461216cd84814d42John McCall PointerExprEvaluator(EvalInfo &info, LValue &Result) 26188cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(Result) {} 2619f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 262047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith bool Success(const CCValue &V, const Expr *E) { 26218cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result.setFrom(V); 26228cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 26232bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson } 262451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 2625f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith return Success((Expr*)0); 2626f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 26272bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 2628efdb83e26f9a1fd2566afe54461216cd84814d42John McCall bool VisitBinaryOperator(const BinaryOperator *E); 26298cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr* E); 2630efdb83e26f9a1fd2566afe54461216cd84814d42John McCall bool VisitUnaryAddrOf(const UnaryOperator *E); 26318cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitObjCStringLiteral(const ObjCStringLiteral *E) 2632efdb83e26f9a1fd2566afe54461216cd84814d42John McCall { return Success(E); } 26338cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitAddrLabelExpr(const AddrLabelExpr *E) 2634efdb83e26f9a1fd2566afe54461216cd84814d42John McCall { return Success(E); } 26358cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCallExpr(const CallExpr *E); 26368cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBlockExpr(const BlockExpr *E) { 2637469a1eb996e1cb0be54f9b210f836afbddcbb2ccJohn McCall if (!E->getBlockDecl()->hasCaptures()) 2638efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 2639f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2640b83d287bc7f47d36fb0751a481e2ef9308b37252Mike Stump } 2641180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitCXXThisExpr(const CXXThisExpr *E) { 2642180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Info.CurrentCall->This) 2643f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2644180f47959a066795cc0f409433023af448bb0328Richard Smith Result = *Info.CurrentCall->This; 2645180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 2646180f47959a066795cc0f409433023af448bb0328Richard Smith } 264756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 2648ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman // FIXME: Missing: @protocol, @selector 26492bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson}; 2650f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} // end anonymous namespace 26512bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 2652efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluatePointer(const Expr* E, LValue& Result, EvalInfo &Info) { 2653c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->hasPointerRepresentation()); 26548cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return PointerExprEvaluator(Info, Result).Visit(E); 2655f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} 2656650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 2657efdb83e26f9a1fd2566afe54461216cd84814d42John McCallbool PointerExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 26582de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() != BO_Add && 26592de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall E->getOpcode() != BO_Sub) 2660e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 26611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2662650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson const Expr *PExp = E->getLHS(); 2663650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson const Expr *IExp = E->getRHS(); 2664650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson if (IExp->getType()->isPointerType()) 2665f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner std::swap(PExp, IExp); 26661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2667efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluatePointer(PExp, Result, Info)) 2668efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 26691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2670efdb83e26f9a1fd2566afe54461216cd84814d42John McCall llvm::APSInt Offset; 2671efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateInteger(IExp, Offset, Info)) 2672efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 2673efdb83e26f9a1fd2566afe54461216cd84814d42John McCall int64_t AdditionalOffset 2674efdb83e26f9a1fd2566afe54461216cd84814d42John McCall = Offset.isSigned() ? Offset.getSExtValue() 2675efdb83e26f9a1fd2566afe54461216cd84814d42John McCall : static_cast<int64_t>(Offset.getZExtValue()); 26760a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (E->getOpcode() == BO_Sub) 26770a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith AdditionalOffset = -AdditionalOffset; 2678650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 2679180f47959a066795cc0f409433023af448bb0328Richard Smith QualType Pointee = PExp->getType()->getAs<PointerType>()->getPointeeType(); 2680b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleLValueArrayAdjustment(Info, E, Result, Pointee, 2681b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith AdditionalOffset); 2682650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson} 26834efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 2684efdb83e26f9a1fd2566afe54461216cd84814d42John McCallbool PointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { 2685efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return EvaluateLValue(E->getSubExpr(), Result, Info); 26864efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 26871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 26888cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool PointerExprEvaluator::VisitCastExpr(const CastExpr* E) { 26898cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 2690650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 269109a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman switch (E->getCastKind()) { 269209a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman default: 269309a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman break; 269409a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman 26952de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_BitCast: 26961d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 26971d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 26982de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_AnyPointerToBlockPointerCast: 269928c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith if (!Visit(SubExpr)) 270028c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith return false; 2701c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // Bitcasts to cv void* are static_casts, not reinterpret_casts, so are 2702c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // permitted in constant expressions in C++11. Bitcasts from cv void* are 2703c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // also static_casts, but we disallow them as a resolution to DR1312. 27044cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith if (!E->getType()->isVoidPointerType()) { 270528c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith Result.Designator.setInvalid(); 27064cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith if (SubExpr->getType()->isVoidPointerType()) 27074cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) 27084cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith << 3 << SubExpr->getType(); 27094cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith else 27104cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 27114cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith } 27120a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 271309a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman 27145c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson case CK_DerivedToBase: 27155c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson case CK_UncheckedDerivedToBase: { 271647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith if (!EvaluatePointer(E->getSubExpr(), Result, Info)) 27175c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return false; 2718e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.Base && Result.Offset.isZero()) 2719e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 27205c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 2721180f47959a066795cc0f409433023af448bb0328Richard Smith // Now figure out the necessary offset to add to the base LV to get from 27225c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson // the derived class to the base class. 2723180f47959a066795cc0f409433023af448bb0328Richard Smith QualType Type = 2724180f47959a066795cc0f409433023af448bb0328Richard Smith E->getSubExpr()->getType()->castAs<PointerType>()->getPointeeType(); 27255c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 2726180f47959a066795cc0f409433023af448bb0328Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 27275c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson PathE = E->path_end(); PathI != PathE; ++PathI) { 2728b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleLValueBase(Info, E, Result, Type->getAsCXXRecordDecl(), 2729b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith *PathI)) 27305c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return false; 2731180f47959a066795cc0f409433023af448bb0328Richard Smith Type = (*PathI)->getType(); 27325c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson } 27335c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 27345c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return true; 27355c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson } 27365c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 2737e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerived: 2738e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 2739e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2740e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.Base && Result.Offset.isZero()) 2741e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2742e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleBaseToDerivedCast(Info, E, Result); 2743e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 274447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith case CK_NullToPointer: 274551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 2746404cd1669c3ba138a9ae0a619bd689cce5aae271John McCall 27472de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_IntegralToPointer: { 2748c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 2749c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 275047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue Value; 2751efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateIntegerOrLValue(SubExpr, Value, Info)) 275209a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman break; 275369ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar 2754efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (Value.isInt()) { 275547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith unsigned Size = Info.Ctx.getTypeSize(E->getType()); 275647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith uint64_t N = Value.getInt().extOrTrunc(Size).getZExtValue(); 27571bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.Base = (Expr*)0; 275847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result.Offset = CharUnits::fromQuantity(N); 2759177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith Result.Frame = 0; 27600a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Result.Designator.setInvalid(); 2761efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 2762efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else { 2763efdb83e26f9a1fd2566afe54461216cd84814d42John McCall // Cast is of an lvalue, no need to change value. 276447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result.setFrom(Value); 2765efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 2766650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson } 2767650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson } 27682de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_ArrayToPointerDecay: 2769e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (SubExpr->isGLValue()) { 2770e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateLValue(SubExpr, Result, Info)) 2771e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2772e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else { 2773e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.set(SubExpr, Info.CurrentCall); 2774e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateConstantExpression(Info.CurrentCall->Temporaries[SubExpr], 2775e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Info, Result, SubExpr)) 2776e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2777e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 27780a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith // The result is a pointer to the first element of the array. 2779b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (const ConstantArrayType *CAT 2780b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith = Info.Ctx.getAsConstantArrayType(SubExpr->getType())) 2781b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result.addArray(Info, E, CAT); 2782b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 2783b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result.Designator.setInvalid(); 27840a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 27856a7c94af983717e2c2d6aebe42cb4737c1c7b9e6Richard Smith 27862de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_FunctionToPointerDecay: 27876a7c94af983717e2c2d6aebe42cb4737c1c7b9e6Richard Smith return EvaluateLValue(SubExpr, Result, Info); 27884efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 27894efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 2790c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 27911eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump} 2792650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 27938cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool PointerExprEvaluator::VisitCallExpr(const CallExpr *E) { 2794180f47959a066795cc0f409433023af448bb0328Richard Smith if (IsStringLiteralCall(E)) 2795efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 279656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 27978cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 27984efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 2799f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 2800f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 2801e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Member Pointer Evaluation 2802e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 2803e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2804e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 2805e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass MemberPointerExprEvaluator 2806e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public ExprEvaluatorBase<MemberPointerExprEvaluator, bool> { 2807e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr &Result; 2808e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2809e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(const ValueDecl *D) { 2810e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = MemberPtr(D); 2811e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2812e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2813e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 2814e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2815e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPointerExprEvaluator(EvalInfo &Info, MemberPtr &Result) 2816e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : ExprEvaluatorBaseTy(Info), Result(Result) {} 2817e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2818e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(const CCValue &V, const Expr *E) { 2819e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.setFrom(V); 2820e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2821e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 282251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 2823e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success((const ValueDecl*)0); 2824e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2825e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2826e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E); 2827e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitUnaryAddrOf(const UnaryOperator *E); 2828e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 2829e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} // end anonymous namespace 2830e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2831e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, 2832e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith EvalInfo &Info) { 2833e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(E->isRValue() && E->getType()->isMemberPointerType()); 2834e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return MemberPointerExprEvaluator(Info, Result).Visit(E); 2835e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 2836e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2837e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool MemberPointerExprEvaluator::VisitCastExpr(const CastExpr *E) { 2838e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 2839e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2840e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 2841e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2842e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_NullToMemberPointer: 284351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 2844e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2845e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerivedMemberPointer: { 2846e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 2847e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2848e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->path_empty()) 2849e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2850e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Base-to-derived member pointer casts store the path in derived-to-base 2851e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // order, so iterate backwards. The CXXBaseSpecifier also provides us with 2852e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // the wrong end of the derived->base arc, so stagger the path by one class. 2853e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef std::reverse_iterator<CastExpr::path_const_iterator> ReverseIter; 2854e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (ReverseIter PathI(E->path_end() - 1), PathE(E->path_begin()); 2855e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathI != PathE; ++PathI) { 2856e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!(*PathI)->isVirtual() && "memptr cast through vbase"); 2857e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Derived = (*PathI)->getType()->getAsCXXRecordDecl(); 2858e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToDerived(Derived)) 2859f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2860e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2861e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const Type *FinalTy = E->getType()->castAs<MemberPointerType>()->getClass(); 2862e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToDerived(FinalTy->getAsCXXRecordDecl())) 2863f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2864e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2865e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2866e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2867e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_DerivedToBaseMemberPointer: 2868e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 2869e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2870e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 2871e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 2872e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!(*PathI)->isVirtual() && "memptr cast through vbase"); 2873e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); 2874e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToBase(Base)) 2875f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2876e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2877e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2878e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2879e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 2880e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2881e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool MemberPointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { 2882e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.unary.op]p3 has very strict rules on how the address of a 2883e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // member can be formed. 2884e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success(cast<DeclRefExpr>(E->getSubExpr())->getDecl()); 2885e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 2886e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2887e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 2888180f47959a066795cc0f409433023af448bb0328Richard Smith// Record Evaluation 2889180f47959a066795cc0f409433023af448bb0328Richard Smith//===----------------------------------------------------------------------===// 2890180f47959a066795cc0f409433023af448bb0328Richard Smith 2891180f47959a066795cc0f409433023af448bb0328Richard Smithnamespace { 2892180f47959a066795cc0f409433023af448bb0328Richard Smith class RecordExprEvaluator 2893180f47959a066795cc0f409433023af448bb0328Richard Smith : public ExprEvaluatorBase<RecordExprEvaluator, bool> { 2894180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue &This; 2895180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result; 2896180f47959a066795cc0f409433023af448bb0328Richard Smith public: 2897180f47959a066795cc0f409433023af448bb0328Richard Smith 2898180f47959a066795cc0f409433023af448bb0328Richard Smith RecordExprEvaluator(EvalInfo &info, const LValue &This, APValue &Result) 2899180f47959a066795cc0f409433023af448bb0328Richard Smith : ExprEvaluatorBaseTy(info), This(This), Result(Result) {} 2900180f47959a066795cc0f409433023af448bb0328Richard Smith 2901180f47959a066795cc0f409433023af448bb0328Richard Smith bool Success(const CCValue &V, const Expr *E) { 2902f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return CheckConstantExpression(Info, E, V, Result); 2903180f47959a066795cc0f409433023af448bb0328Richard Smith } 290451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E); 2905180f47959a066795cc0f409433023af448bb0328Richard Smith 290659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith bool VisitCastExpr(const CastExpr *E); 2907180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitInitListExpr(const InitListExpr *E); 2908180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E); 2909180f47959a066795cc0f409433023af448bb0328Richard Smith }; 2910180f47959a066795cc0f409433023af448bb0328Richard Smith} 2911180f47959a066795cc0f409433023af448bb0328Richard Smith 291251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// Perform zero-initialization on an object of non-union class type. 291351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// C++11 [dcl.init]p5: 291451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// To zero-initialize an object or reference of type T means: 291551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// [...] 291651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// -- if T is a (possibly cv-qualified) non-union class type, 291751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// each non-static data member and each base-class subobject is 291851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// zero-initialized 2919b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleClassZeroInitialization(EvalInfo &Info, const Expr *E, 2920b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const RecordDecl *RD, 292151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const LValue &This, APValue &Result) { 292251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith assert(!RD->isUnion() && "Expected non-union class type"); 292351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD); 292451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue(APValue::UninitStruct(), CD ? CD->getNumBases() : 0, 292551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith std::distance(RD->field_begin(), RD->field_end())); 292651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 292751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 292851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 292951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CD) { 293051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith unsigned Index = 0; 293151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith for (CXXRecordDecl::base_class_const_iterator I = CD->bases_begin(), 2932b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith End = CD->bases_end(); I != End; ++I, ++Index) { 293351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 293451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 2935b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, E, Subobject, CD, Base, &Layout); 2936b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleClassZeroInitialization(Info, E, Base, Subobject, 293751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result.getStructBase(Index))) 293851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 293951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 294051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 294151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 2942b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith for (RecordDecl::field_iterator I = RD->field_begin(), End = RD->field_end(); 2943b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith I != End; ++I) { 294451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // -- if T is a reference type, no initialization is performed. 294551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if ((*I)->getType()->isReferenceType()) 294651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith continue; 294751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 294851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 2949b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, E, Subobject, *I, &Layout); 295051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 295151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE((*I)->getType()); 295251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!EvaluateConstantExpression( 295351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result.getStructField((*I)->getFieldIndex()), Info, Subobject, &VIE)) 295451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 295551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 295651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 295751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 295851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 295951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 296051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smithbool RecordExprEvaluator::ZeroInitialization(const Expr *E) { 296151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl(); 296251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (RD->isUnion()) { 296351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // C++11 [dcl.init]p5: If T is a (possibly cv-qualified) union type, the 296451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // object's first non-static named data member is zero-initialized 296551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RecordDecl::field_iterator I = RD->field_begin(); 296651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (I == RD->field_end()) { 296751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue((const FieldDecl*)0); 296851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 296951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 297051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 297151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 2972b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, E, Subobject, *I); 297351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue(*I); 297451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE((*I)->getType()); 297551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return EvaluateConstantExpression(Result.getUnionValue(), Info, 297651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Subobject, &VIE); 297751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 297851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 2979b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleClassZeroInitialization(Info, E, RD, This, Result); 298051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 298151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 298259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithbool RecordExprEvaluator::VisitCastExpr(const CastExpr *E) { 298359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith switch (E->getCastKind()) { 298459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith default: 298559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 298659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 298759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_ConstructorConversion: 298859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return Visit(E->getSubExpr()); 298959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 299059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_DerivedToBase: 299159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_UncheckedDerivedToBase: { 299259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith CCValue DerivedObject; 2993f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Evaluate(DerivedObject, Info, E->getSubExpr())) 299459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return false; 2995f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!DerivedObject.isStruct()) 2996f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E->getSubExpr()); 299759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 299859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Derived-to-base rvalue conversion: just slice off the derived part. 299959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith APValue *Value = &DerivedObject; 300059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *RD = E->getSubExpr()->getType()->getAsCXXRecordDecl(); 300159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 300259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 300359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith assert(!(*PathI)->isVirtual() && "record rvalue with virtual base"); 300459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); 300559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Value = &Value->getStructBase(getBaseIndex(RD, Base)); 300659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith RD = Base; 300759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 300859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Result = *Value; 300959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return true; 301059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 301159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 301259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 301359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3014180f47959a066795cc0f409433023af448bb0328Richard Smithbool RecordExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 3015180f47959a066795cc0f409433023af448bb0328Richard Smith const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl(); 3016180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 3017180f47959a066795cc0f409433023af448bb0328Richard Smith 3018180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 3019ec789163a42a7be654ac34aadb750b508954d53cRichard Smith const FieldDecl *Field = E->getInitializedFieldInUnion(); 3020ec789163a42a7be654ac34aadb750b508954d53cRichard Smith Result = APValue(Field); 3021ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!Field) 3022180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 3023ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 3024ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // If the initializer list for a union does not contain any elements, the 3025ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // first element of the union is value-initialized. 3026ec789163a42a7be654ac34aadb750b508954d53cRichard Smith ImplicitValueInitExpr VIE(Field->getType()); 3027ec789163a42a7be654ac34aadb750b508954d53cRichard Smith const Expr *InitExpr = E->getNumInits() ? E->getInit(0) : &VIE; 3028ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 3029180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3030ec789163a42a7be654ac34aadb750b508954d53cRichard Smith HandleLValueMember(Info, InitExpr, Subobject, Field, &Layout); 3031180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateConstantExpression(Result.getUnionValue(), Info, 3032ec789163a42a7be654ac34aadb750b508954d53cRichard Smith Subobject, InitExpr); 3033180f47959a066795cc0f409433023af448bb0328Richard Smith } 3034180f47959a066795cc0f409433023af448bb0328Richard Smith 3035180f47959a066795cc0f409433023af448bb0328Richard Smith assert((!isa<CXXRecordDecl>(RD) || !cast<CXXRecordDecl>(RD)->getNumBases()) && 3036180f47959a066795cc0f409433023af448bb0328Richard Smith "initializer list for class with base classes"); 3037180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitStruct(), 0, 3038180f47959a066795cc0f409433023af448bb0328Richard Smith std::distance(RD->field_begin(), RD->field_end())); 3039180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned ElementNo = 0; 3040180f47959a066795cc0f409433023af448bb0328Richard Smith for (RecordDecl::field_iterator Field = RD->field_begin(), 3041180f47959a066795cc0f409433023af448bb0328Richard Smith FieldEnd = RD->field_end(); Field != FieldEnd; ++Field) { 3042180f47959a066795cc0f409433023af448bb0328Richard Smith // Anonymous bit-fields are not considered members of the class for 3043180f47959a066795cc0f409433023af448bb0328Richard Smith // purposes of aggregate initialization. 3044180f47959a066795cc0f409433023af448bb0328Richard Smith if (Field->isUnnamedBitfield()) 3045180f47959a066795cc0f409433023af448bb0328Richard Smith continue; 3046180f47959a066795cc0f409433023af448bb0328Richard Smith 3047180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3048180f47959a066795cc0f409433023af448bb0328Richard Smith 3049180f47959a066795cc0f409433023af448bb0328Richard Smith if (ElementNo < E->getNumInits()) { 3050b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, E->getInit(ElementNo), Subobject, *Field, 3051b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith &Layout); 3052180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateConstantExpression( 3053180f47959a066795cc0f409433023af448bb0328Richard Smith Result.getStructField((*Field)->getFieldIndex()), 3054180f47959a066795cc0f409433023af448bb0328Richard Smith Info, Subobject, E->getInit(ElementNo++))) 3055180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 3056180f47959a066795cc0f409433023af448bb0328Richard Smith } else { 3057180f47959a066795cc0f409433023af448bb0328Richard Smith // Perform an implicit value-initialization for members beyond the end of 3058180f47959a066795cc0f409433023af448bb0328Richard Smith // the initializer list. 3059b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, E, Subobject, *Field, &Layout); 3060180f47959a066795cc0f409433023af448bb0328Richard Smith ImplicitValueInitExpr VIE(Field->getType()); 3061180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateConstantExpression( 3062180f47959a066795cc0f409433023af448bb0328Richard Smith Result.getStructField((*Field)->getFieldIndex()), 3063180f47959a066795cc0f409433023af448bb0328Richard Smith Info, Subobject, &VIE)) 3064180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 3065180f47959a066795cc0f409433023af448bb0328Richard Smith } 3066180f47959a066795cc0f409433023af448bb0328Richard Smith } 3067180f47959a066795cc0f409433023af448bb0328Richard Smith 3068180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 3069180f47959a066795cc0f409433023af448bb0328Richard Smith} 3070180f47959a066795cc0f409433023af448bb0328Richard Smith 3071180f47959a066795cc0f409433023af448bb0328Richard Smithbool RecordExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) { 3072180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXConstructorDecl *FD = E->getConstructor(); 307351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInit = E->requiresZeroInitialization(); 307451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) { 3075ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // If we've already performed zero-initialization, we're already done. 3076ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!Result.isUninit()) 3077ec789163a42a7be654ac34aadb750b508954d53cRichard Smith return true; 3078ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 307951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit) 308051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 308151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 30826180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith const CXXRecordDecl *RD = FD->getParent(); 30836180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (RD->isUnion()) 30846180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result = APValue((FieldDecl*)0); 30856180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith else 30866180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result = APValue(APValue::UninitStruct(), RD->getNumBases(), 30876180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith std::distance(RD->field_begin(), RD->field_end())); 30886180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 30896180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 30906180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 3091180f47959a066795cc0f409433023af448bb0328Richard Smith const FunctionDecl *Definition = 0; 3092180f47959a066795cc0f409433023af448bb0328Richard Smith FD->getBody(Definition); 3093180f47959a066795cc0f409433023af448bb0328Richard Smith 3094c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition)) 3095c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 3096180f47959a066795cc0f409433023af448bb0328Richard Smith 3097610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // Avoid materializing a temporary for an elidable copy/move constructor. 309851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (E->isElidable() && !ZeroInit) 3099180f47959a066795cc0f409433023af448bb0328Richard Smith if (const MaterializeTemporaryExpr *ME 3100180f47959a066795cc0f409433023af448bb0328Richard Smith = dyn_cast<MaterializeTemporaryExpr>(E->getArg(0))) 3101180f47959a066795cc0f409433023af448bb0328Richard Smith return Visit(ME->GetTemporaryExpr()); 3102180f47959a066795cc0f409433023af448bb0328Richard Smith 310351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit && !ZeroInitialization(E)) 310451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 310551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3106180f47959a066795cc0f409433023af448bb0328Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 3107f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return HandleConstructorCall(E, This, Args, 3108f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith cast<CXXConstructorDecl>(Definition), Info, 3109f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Result); 3110180f47959a066795cc0f409433023af448bb0328Richard Smith} 3111180f47959a066795cc0f409433023af448bb0328Richard Smith 3112180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateRecord(const Expr *E, const LValue &This, 3113180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result, EvalInfo &Info) { 3114180f47959a066795cc0f409433023af448bb0328Richard Smith assert(E->isRValue() && E->getType()->isRecordType() && 3115180f47959a066795cc0f409433023af448bb0328Richard Smith "can't evaluate expression as a record rvalue"); 3116180f47959a066795cc0f409433023af448bb0328Richard Smith return RecordExprEvaluator(Info, This, Result).Visit(E); 3117180f47959a066795cc0f409433023af448bb0328Richard Smith} 3118180f47959a066795cc0f409433023af448bb0328Richard Smith 3119180f47959a066795cc0f409433023af448bb0328Richard Smith//===----------------------------------------------------------------------===// 3120e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Temporary Evaluation 3121e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// 3122e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Temporaries are represented in the AST as rvalues, but generally behave like 3123e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// lvalues. The full-object of which the temporary is a subobject is implicitly 3124e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// materialized so that a reference can bind to it. 3125e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3126e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 3127e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass TemporaryExprEvaluator 3128e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public LValueExprEvaluatorBase<TemporaryExprEvaluator> { 3129e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 3130e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith TemporaryExprEvaluator(EvalInfo &Info, LValue &Result) : 3131e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBaseTy(Info, Result) {} 3132e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3133e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Visit an expression which constructs the value of this temporary. 3134e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitConstructExpr(const Expr *E) { 3135e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.set(E, Info.CurrentCall); 3136e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateConstantExpression(Info.CurrentCall->Temporaries[E], Info, 3137e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result, E); 3138e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3139e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3140e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E) { 3141e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 3142e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 3143e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitCastExpr(E); 3144e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3145e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_ConstructorConversion: 3146e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E->getSubExpr()); 3147e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3148e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3149e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitInitListExpr(const InitListExpr *E) { 3150e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3151e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3152e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E) { 3153e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3154e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3155e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCallExpr(const CallExpr *E) { 3156e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3157e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3158e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 3159e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} // end anonymous namespace 3160e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3161e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// Evaluate an expression of record type as a temporary. 3162e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info) { 3163af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith assert(E->isRValue() && E->getType()->isRecordType()); 3164e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return TemporaryExprEvaluator(Info, Result).Visit(E); 3165e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3166e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3167e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 316859b5da6d853b4368b984700315adf7b37de05764Nate Begeman// Vector Evaluation 316959b5da6d853b4368b984700315adf7b37de05764Nate Begeman//===----------------------------------------------------------------------===// 317059b5da6d853b4368b984700315adf7b37de05764Nate Begeman 317159b5da6d853b4368b984700315adf7b37de05764Nate Begemannamespace { 3172770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramer class VectorExprEvaluator 317307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith : public ExprEvaluatorBase<VectorExprEvaluator, bool> { 317407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith APValue &Result; 317559b5da6d853b4368b984700315adf7b37de05764Nate Begeman public: 31761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 317707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith VectorExprEvaluator(EvalInfo &info, APValue &Result) 317807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith : ExprEvaluatorBaseTy(info), Result(Result) {} 31791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 318007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool Success(const ArrayRef<APValue> &V, const Expr *E) { 318107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith assert(V.size() == E->getType()->castAs<VectorType>()->getNumElements()); 318207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith // FIXME: remove this APValue copy. 318307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Result = APValue(V.data(), V.size()); 318407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return true; 318507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith } 318669c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith bool Success(const CCValue &V, const Expr *E) { 318769c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith assert(V.isVector()); 318807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Result = V; 318907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return true; 319007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith } 319151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E); 31921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 319307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitUnaryReal(const UnaryOperator *E) 319491110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman { return Visit(E->getSubExpr()); } 319507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitCastExpr(const CastExpr* E); 319607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitInitListExpr(const InitListExpr *E); 319707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitUnaryImag(const UnaryOperator *E); 319891110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman // FIXME: Missing: unary -, unary ~, binary add/sub/mul/div, 31992217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman // binary comparisons, binary and/or/xor, 320091110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman // shufflevector, ExtVectorElementExpr 320159b5da6d853b4368b984700315adf7b37de05764Nate Begeman }; 320259b5da6d853b4368b984700315adf7b37de05764Nate Begeman} // end anonymous namespace 320359b5da6d853b4368b984700315adf7b37de05764Nate Begeman 320459b5da6d853b4368b984700315adf7b37de05764Nate Begemanstatic bool EvaluateVector(const Expr* E, APValue& Result, EvalInfo &Info) { 3205c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isVectorType() &&"not a vector rvalue"); 320607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return VectorExprEvaluator(Info, Result).Visit(E); 320759b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 320859b5da6d853b4368b984700315adf7b37de05764Nate Begeman 320907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool VectorExprEvaluator::VisitCastExpr(const CastExpr* E) { 321007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VTy = E->getType()->castAs<VectorType>(); 3211c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman unsigned NElts = VTy->getNumElements(); 32121eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3213d62ca370b03b8c6ad58002d3399383baf744e32bRichard Smith const Expr *SE = E->getSubExpr(); 3214e8c9e9218f215ec6089f12b076c7b9d310fd5194Nate Begeman QualType SETy = SE->getType(); 321559b5da6d853b4368b984700315adf7b37de05764Nate Begeman 321646a523285928aa07bf14803178dc04616ac85994Eli Friedman switch (E->getCastKind()) { 321746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_VectorSplat: { 321807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith APValue Val = APValue(); 321946a523285928aa07bf14803178dc04616ac85994Eli Friedman if (SETy->isIntegerType()) { 322046a523285928aa07bf14803178dc04616ac85994Eli Friedman APSInt IntResult; 322146a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateInteger(SE, IntResult, Info)) 3222f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 322307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Val = APValue(IntResult); 322446a523285928aa07bf14803178dc04616ac85994Eli Friedman } else if (SETy->isRealFloatingType()) { 322546a523285928aa07bf14803178dc04616ac85994Eli Friedman APFloat F(0.0); 322646a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateFloat(SE, F, Info)) 3227f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 322807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Val = APValue(F); 322946a523285928aa07bf14803178dc04616ac85994Eli Friedman } else { 323007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Error(E); 323146a523285928aa07bf14803178dc04616ac85994Eli Friedman } 3232c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman 3233c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman // Splat and create vector APValue. 323407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith SmallVector<APValue, 4> Elts(NElts, Val); 323507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elts, E); 3236e8c9e9218f215ec6089f12b076c7b9d310fd5194Nate Begeman } 3237e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman case CK_BitCast: { 3238e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Evaluate the operand into an APInt we can extract from. 3239e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt SValInt; 3240e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (!EvalAndBitcastToAPInt(Info, SE, SValInt)) 3241e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 3242e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Extract the elements 3243e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType EltTy = VTy->getElementType(); 3244e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned EltSize = Info.Ctx.getTypeSize(EltTy); 3245e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); 3246e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman SmallVector<APValue, 4> Elts; 3247e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (EltTy->isRealFloatingType()) { 3248e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(EltTy); 3249e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool isIEESem = &Sem != &APFloat::PPCDoubleDouble; 3250e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned FloatEltSize = EltSize; 3251e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (&Sem == &APFloat::x87DoubleExtended) 3252e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman FloatEltSize = 80; 3253e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < NElts; i++) { 3254e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt Elt; 3255e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 3256e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotl(i*EltSize+FloatEltSize).trunc(FloatEltSize); 3257e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 3258e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotr(i*EltSize).trunc(FloatEltSize); 3259e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elts.push_back(APValue(APFloat(Elt, isIEESem))); 3260e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3261e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else if (EltTy->isIntegerType()) { 3262e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < NElts; i++) { 3263e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt Elt; 3264e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 3265e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotl(i*EltSize+EltSize).zextOrTrunc(EltSize); 3266e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 3267e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotr(i*EltSize).zextOrTrunc(EltSize); 3268e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elts.push_back(APValue(APSInt(Elt, EltTy->isSignedIntegerType()))); 3269e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3270e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else { 3271e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return Error(E); 3272e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3273e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return Success(Elts, E); 3274e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 327546a523285928aa07bf14803178dc04616ac85994Eli Friedman default: 3276c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 3277c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman } 327859b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 327959b5da6d853b4368b984700315adf7b37de05764Nate Begeman 328007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool 328159b5da6d853b4368b984700315adf7b37de05764Nate BegemanVectorExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 328207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VT = E->getType()->castAs<VectorType>(); 328359b5da6d853b4368b984700315adf7b37de05764Nate Begeman unsigned NumInits = E->getNumInits(); 328491110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman unsigned NumElements = VT->getNumElements(); 32851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 328659b5da6d853b4368b984700315adf7b37de05764Nate Begeman QualType EltTy = VT->getElementType(); 32875f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<APValue, 4> Elements; 328859b5da6d853b4368b984700315adf7b37de05764Nate Begeman 32893edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // The number of initializers can be less than the number of 32903edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // vector elements. For OpenCL, this can be due to nested vector 32913edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // initialization. For GCC compatibility, missing trailing elements 32923edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // should be initialized with zeroes. 32933edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman unsigned CountInits = 0, CountElts = 0; 32943edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman while (CountElts < NumElements) { 32953edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // Handle nested vector initialization. 32963edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits 32973edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman && E->getInit(CountInits)->getType()->isExtVectorType()) { 32983edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman APValue v; 32993edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateVector(E->getInit(CountInits), v, Info)) 33003edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 33013edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman unsigned vlen = v.getVectorLength(); 33023edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman for (unsigned j = 0; j < vlen; j++) 33033edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(v.getVectorElt(j)); 33043edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts += vlen; 33053edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else if (EltTy->isIntegerType()) { 330659b5da6d853b4368b984700315adf7b37de05764Nate Begeman llvm::APSInt sInt(32); 33073edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits) { 33083edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateInteger(E->getInit(CountInits), sInt, Info)) 33093edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 33103edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else // trailing integer zero. 33113edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman sInt = Info.Ctx.MakeIntValue(0, EltTy); 33123edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(APValue(sInt)); 33133edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts++; 331459b5da6d853b4368b984700315adf7b37de05764Nate Begeman } else { 331559b5da6d853b4368b984700315adf7b37de05764Nate Begeman llvm::APFloat f(0.0); 33163edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits) { 33173edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateFloat(E->getInit(CountInits), f, Info)) 33183edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 33193edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else // trailing float zero. 33203edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman f = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy)); 33213edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(APValue(f)); 33223edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts++; 332359b5da6d853b4368b984700315adf7b37de05764Nate Begeman } 33243edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountInits++; 332559b5da6d853b4368b984700315adf7b37de05764Nate Begeman } 332607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elements, E); 332759b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 332859b5da6d853b4368b984700315adf7b37de05764Nate Begeman 332907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool 333051201882382fb40c9456a06c7f93d6ddd4a57712Richard SmithVectorExprEvaluator::ZeroInitialization(const Expr *E) { 333107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VT = E->getType()->getAs<VectorType>(); 333291110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman QualType EltTy = VT->getElementType(); 333391110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman APValue ZeroElement; 333491110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman if (EltTy->isIntegerType()) 333591110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman ZeroElement = APValue(Info.Ctx.MakeIntValue(0, EltTy)); 333691110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman else 333791110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman ZeroElement = 333891110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman APValue(APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy))); 333991110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 33405f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<APValue, 4> Elements(VT->getNumElements(), ZeroElement); 334107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elements, E); 334291110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman} 334391110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 334407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool VectorExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 33458327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 334651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 334791110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman} 334891110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 334959b5da6d853b4368b984700315adf7b37de05764Nate Begeman//===----------------------------------------------------------------------===// 3350cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith// Array Evaluation 3351cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith//===----------------------------------------------------------------------===// 3352cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3353cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smithnamespace { 3354cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith class ArrayExprEvaluator 3355cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith : public ExprEvaluatorBase<ArrayExprEvaluator, bool> { 3356180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue &This; 3357cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith APValue &Result; 3358cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith public: 3359cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3360180f47959a066795cc0f409433023af448bb0328Richard Smith ArrayExprEvaluator(EvalInfo &Info, const LValue &This, APValue &Result) 3361180f47959a066795cc0f409433023af448bb0328Richard Smith : ExprEvaluatorBaseTy(Info), This(This), Result(Result) {} 3362cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3363cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith bool Success(const APValue &V, const Expr *E) { 3364cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith assert(V.isArray() && "Expected array type"); 3365cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith Result = V; 3366cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 3367cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 3368cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 336951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3370180f47959a066795cc0f409433023af448bb0328Richard Smith const ConstantArrayType *CAT = 3371180f47959a066795cc0f409433023af448bb0328Richard Smith Info.Ctx.getAsConstantArrayType(E->getType()); 3372180f47959a066795cc0f409433023af448bb0328Richard Smith if (!CAT) 3373f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3374180f47959a066795cc0f409433023af448bb0328Richard Smith 3375180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitArray(), 0, 3376180f47959a066795cc0f409433023af448bb0328Richard Smith CAT->getSize().getZExtValue()); 3377180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Result.hasArrayFiller()) return true; 3378180f47959a066795cc0f409433023af448bb0328Richard Smith 337951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Zero-initialize all elements. 3380180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3381b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 3382180f47959a066795cc0f409433023af448bb0328Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 3383180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateConstantExpression(Result.getArrayFiller(), Info, 3384180f47959a066795cc0f409433023af448bb0328Richard Smith Subobject, &VIE); 3385180f47959a066795cc0f409433023af448bb0328Richard Smith } 3386180f47959a066795cc0f409433023af448bb0328Richard Smith 3387cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith bool VisitInitListExpr(const InitListExpr *E); 3388e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E); 3389cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith }; 3390cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} // end anonymous namespace 3391cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3392180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateArray(const Expr *E, const LValue &This, 3393180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result, EvalInfo &Info) { 339451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith assert(E->isRValue() && E->getType()->isArrayType() && "not an array rvalue"); 3395180f47959a066795cc0f409433023af448bb0328Richard Smith return ArrayExprEvaluator(Info, This, Result).Visit(E); 3396cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 3397cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3398cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smithbool ArrayExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 3399cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(E->getType()); 3400cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (!CAT) 3401f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3402cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3403974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // C++11 [dcl.init.string]p1: A char array [...] can be initialized by [...] 3404974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // an appropriately-typed string literal enclosed in braces. 3405ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (E->getNumInits() == 1 && E->getInit(0)->isGLValue() && 3406974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith Info.Ctx.hasSameUnqualifiedType(E->getType(), E->getInit(0)->getType())) { 3407974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith LValue LV; 3408974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith if (!EvaluateLValue(E->getInit(0), LV, Info)) 3409974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith return false; 3410974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith uint64_t NumElements = CAT->getSize().getZExtValue(); 3411974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith Result = APValue(APValue::UninitArray(), NumElements, NumElements); 3412974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith 3413974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // Copy the string literal into the array. FIXME: Do this better. 3414b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LV.addArray(Info, E, CAT); 3415974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith for (uint64_t I = 0; I < NumElements; ++I) { 3416974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith CCValue Char; 3417974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith if (!HandleLValueToRValueConversion(Info, E->getInit(0), 3418974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith CAT->getElementType(), LV, Char)) 3419974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith return false; 3420974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith if (!CheckConstantExpression(Info, E->getInit(0), Char, 3421974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith Result.getArrayInitializedElt(I))) 3422974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith return false; 3423b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleLValueArrayAdjustment(Info, E->getInit(0), LV, 3424b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CAT->getElementType(), 1)) 3425974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith return false; 3426974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith } 3427974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith return true; 3428974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith } 3429974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith 3430cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith Result = APValue(APValue::UninitArray(), E->getNumInits(), 3431cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith CAT->getSize().getZExtValue()); 3432180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3433b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 3434180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned Index = 0; 3435cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith for (InitListExpr::const_iterator I = E->begin(), End = E->end(); 3436180f47959a066795cc0f409433023af448bb0328Richard Smith I != End; ++I, ++Index) { 3437180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateConstantExpression(Result.getArrayInitializedElt(Index), 3438180f47959a066795cc0f409433023af448bb0328Richard Smith Info, Subobject, cast<Expr>(*I))) 3439180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 3440b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleLValueArrayAdjustment(Info, cast<Expr>(*I), Subobject, 3441b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CAT->getElementType(), 1)) 3442cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 3443180f47959a066795cc0f409433023af448bb0328Richard Smith } 3444cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3445cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (!Result.hasArrayFiller()) return true; 3446cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith assert(E->hasArrayFiller() && "no array filler for incomplete init list"); 3447180f47959a066795cc0f409433023af448bb0328Richard Smith // FIXME: The Subobject here isn't necessarily right. This rarely matters, 3448180f47959a066795cc0f409433023af448bb0328Richard Smith // but sometimes does: 3449180f47959a066795cc0f409433023af448bb0328Richard Smith // struct S { constexpr S() : p(&p) {} void *p; }; 3450180f47959a066795cc0f409433023af448bb0328Richard Smith // S s[10] = {}; 3451cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return EvaluateConstantExpression(Result.getArrayFiller(), Info, 3452180f47959a066795cc0f409433023af448bb0328Richard Smith Subobject, E->getArrayFiller()); 3453cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 3454cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3455e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool ArrayExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) { 3456e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(E->getType()); 3457e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!CAT) 3458f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3459e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3460ec789163a42a7be654ac34aadb750b508954d53cRichard Smith bool HadZeroInit = !Result.isUninit(); 3461ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!HadZeroInit) 3462ec789163a42a7be654ac34aadb750b508954d53cRichard Smith Result = APValue(APValue::UninitArray(), 0, CAT->getSize().getZExtValue()); 3463e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.hasArrayFiller()) 3464e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3465e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3466e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXConstructorDecl *FD = E->getConstructor(); 34676180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 346851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInit = E->requiresZeroInitialization(); 346951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) { 3470ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (HadZeroInit) 3471ec789163a42a7be654ac34aadb750b508954d53cRichard Smith return true; 3472ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 347351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit) { 347451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3475b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 347651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 347751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return EvaluateConstantExpression(Result.getArrayFiller(), Info, 347851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Subobject, &VIE); 347951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 348051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 34816180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith const CXXRecordDecl *RD = FD->getParent(); 34826180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (RD->isUnion()) 34836180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result.getArrayFiller() = APValue((FieldDecl*)0); 34846180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith else 34856180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result.getArrayFiller() = 34866180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith APValue(APValue::UninitStruct(), RD->getNumBases(), 34876180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith std::distance(RD->field_begin(), RD->field_end())); 34886180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 34896180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 34906180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 3491e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const FunctionDecl *Definition = 0; 3492e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith FD->getBody(Definition); 3493e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3494c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition)) 3495c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 3496e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3497e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // FIXME: The Subobject here isn't necessarily right. This rarely matters, 3498e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // but sometimes does: 3499e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // struct S { constexpr S() : p(&p) {} void *p; }; 3500e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // S s[10]; 3501e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue Subobject = This; 3502b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 350351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3504ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (ZeroInit && !HadZeroInit) { 350551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 350651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!EvaluateConstantExpression(Result.getArrayFiller(), Info, Subobject, 350751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith &VIE)) 350851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 350951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 351051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3511e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 3512f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return HandleConstructorCall(E, Subobject, Args, 3513e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith cast<CXXConstructorDecl>(Definition), 3514e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Info, Result.getArrayFiller()); 3515e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3516e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3517cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith//===----------------------------------------------------------------------===// 3518f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner// Integer Evaluation 3519c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 3520c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// As a GNU extension, we support casting pointers to sufficiently-wide integer 3521c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// types and back in constant folding. Integer values are thus represented 3522c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// either as an integer-valued APValue, or as an lvalue-valued APValue. 3523f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 3524f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3525f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnernamespace { 3526770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass IntExprEvaluator 35278cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<IntExprEvaluator, bool> { 352847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue &Result; 3529f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnerpublic: 353047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith IntExprEvaluator(EvalInfo &info, CCValue &result) 35318cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(result) {} 3532f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3533973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool Success(const llvm::APSInt &SI, const Expr *E) { 3534973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(E->getType()->isIntegralOrEnumerationType() && 35352ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 3536973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(SI.isSigned() == E->getType()->isSignedIntegerOrEnumerationType() && 35373f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 3538973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(SI.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && 35393f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 354047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = CCValue(SI); 35413f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar return true; 35423f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 35433f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar 3544131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar bool Success(const llvm::APInt &I, const Expr *E) { 35452ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor assert(E->getType()->isIntegralOrEnumerationType() && 35462ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 354730c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar assert(I.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && 35483f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 354947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = CCValue(APSInt(I)); 3550575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor Result.getInt().setIsUnsigned( 3551575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor E->getType()->isUnsignedIntegerOrEnumerationType()); 3552131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return true; 3553131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 3554131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 3555131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar bool Success(uint64_t Value, const Expr *E) { 35562ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor assert(E->getType()->isIntegralOrEnumerationType() && 35572ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 355847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = CCValue(Info.Ctx.MakeIntValue(Value, E->getType())); 3559131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return true; 3560131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 3561131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 35624f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck bool Success(CharUnits Size, const Expr *E) { 35634f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(Size.getQuantity(), E); 35644f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck } 35654f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck 356647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith bool Success(const CCValue &V, const Expr *E) { 35675930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (V.isLValue() || V.isAddrLabelDiff()) { 3568342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith Result = V; 3569342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith return true; 3570342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith } 35718cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return Success(V.getInt(), E); 357232fea9d18cc3658a1b01df5ca6f2ac302625c61dChris Lattner } 35731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 357451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { return Success(0, E); } 3575f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 35768cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 35778cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne // Visitor Methods 35788cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 3579f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 35804c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner bool VisitIntegerLiteral(const IntegerLiteral *E) { 3581131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 35824c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner } 35834c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner bool VisitCharacterLiteral(const CharacterLiteral *E) { 3584131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 35854c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner } 3586043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman 3587043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool CheckReferencedDecl(const Expr *E, const Decl *D); 3588043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool VisitDeclRefExpr(const DeclRefExpr *E) { 35898cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (CheckReferencedDecl(E, E->getDecl())) 35908cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 35918cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 35928cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitDeclRefExpr(E); 3593043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 3594043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool VisitMemberExpr(const MemberExpr *E) { 3595043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman if (CheckReferencedDecl(E, E->getMemberDecl())) { 3596c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith VisitIgnoredValue(E->getBase()); 3597043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman return true; 3598043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 35998cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 36008cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitMemberExpr(E); 3601043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 3602043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman 36038cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCallExpr(const CallExpr *E); 3604b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner bool VisitBinaryOperator(const BinaryOperator *E); 36058ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor bool VisitOffsetOfExpr(const OffsetOfExpr *E); 3606b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner bool VisitUnaryOperator(const UnaryOperator *E); 3607f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 36088cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr* E); 3609f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E); 36100518999d3adcc289997bd974dce90cc97f5c1c44Sebastian Redl 36113068d117951a8df54bae9db039b56201ab10962bAnders Carlsson bool VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) { 3612131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 36133068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 36141eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3615f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith // Note, GNU defines __null as an integer, not a pointer. 36163f70456b8adb0405ef2a47d51f9fc2d5937ae8aeAnders Carlsson bool VisitGNUNullExpr(const GNUNullExpr *E) { 361751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 3618664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman } 3619664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 362064b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl bool VisitUnaryTypeTraitExpr(const UnaryTypeTraitExpr *E) { 36210dfd848fa4c9664852ba8c929a8bd3fce93ddca2Sebastian Redl return Success(E->getValue(), E); 362264b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl } 362364b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl 36246ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet bool VisitBinaryTypeTraitExpr(const BinaryTypeTraitExpr *E) { 36256ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet return Success(E->getValue(), E); 36266ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet } 36276ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet 362821ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley bool VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) { 362921ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley return Success(E->getValue(), E); 363021ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley } 363121ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley 3632552622067dc45013d240f73952fece703f5e63bdJohn Wiegley bool VisitExpressionTraitExpr(const ExpressionTraitExpr *E) { 3633552622067dc45013d240f73952fece703f5e63bdJohn Wiegley return Success(E->getValue(), E); 3634552622067dc45013d240f73952fece703f5e63bdJohn Wiegley } 3635552622067dc45013d240f73952fece703f5e63bdJohn Wiegley 3636722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman bool VisitUnaryReal(const UnaryOperator *E); 3637664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman bool VisitUnaryImag(const UnaryOperator *E); 3638664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 3639295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl bool VisitCXXNoexceptExpr(const CXXNoexceptExpr *E); 3640ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor bool VisitSizeOfPackExpr(const SizeOfPackExpr *E); 3641cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 3642fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattnerprivate: 36438b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck CharUnits GetAlignOfExpr(const Expr *E); 36448b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck CharUnits GetAlignOfType(QualType T); 36451bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith static QualType GetObjectType(APValue::LValueBase B); 36468cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool TryEvaluateBuiltinObjectSize(const CallExpr *E); 3647664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman // FIXME: Missing: array subscript of vector, member of vector 3648f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner}; 3649f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} // end anonymous namespace 3650f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3651c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// EvaluateIntegerOrLValue - Evaluate an rvalue integral-typed expression, and 3652c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// produce either the integer value or a pointer. 3653c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// 3654c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// GCC has a heinous extension which folds casts between pointer types and 3655c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// pointer-sized integral types. We support this by allowing the evaluation of 3656c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// an integer rvalue to produce a pointer (represented as an lvalue) instead. 3657c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// Some simple arithmetic on such values is supported (they are treated much 3658c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// like char*). 3659f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateIntegerOrLValue(const Expr *E, CCValue &Result, 366047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith EvalInfo &Info) { 3661c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isIntegralOrEnumerationType()); 36628cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return IntExprEvaluator(Info, Result).Visit(E); 366369ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar} 366469ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar 3665f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info) { 366647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue Val; 3667f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateIntegerOrLValue(E, Val, Info)) 3668f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 3669f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Val.isInt()) { 3670f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: It would be better to produce the diagnostic for casting 3671f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // a pointer to an integer. 3672dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 367330c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return false; 3674f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 367530c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar Result = Val.getInt(); 367630c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return true; 3677f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} 3678f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3679f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Check whether the given declaration can be directly converted to an integral 3680f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// rvalue. If not, no diagnostic is produced; there are other things we can 3681f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// try. 3682043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedmanbool IntExprEvaluator::CheckReferencedDecl(const Expr* E, const Decl* D) { 36834c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // Enums are integer constant exprs. 3684bfbdcd861a4364bfc21a9e5047bdbd56812d6693Abramo Bagnara if (const EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(D)) { 3685973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // Check for signedness/width mismatches between E type and ECD value. 3686973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool SameSign = (ECD->getInitVal().isSigned() 3687973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara == E->getType()->isSignedIntegerOrEnumerationType()); 3688973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool SameWidth = (ECD->getInitVal().getBitWidth() 3689973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara == Info.Ctx.getIntWidth(E->getType())); 3690973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (SameSign && SameWidth) 3691973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara return Success(ECD->getInitVal(), E); 3692973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara else { 3693973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // Get rid of mismatch (otherwise Success assertions will fail) 3694973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // by computing a new value matching the type of E. 3695973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara llvm::APSInt Val = ECD->getInitVal(); 3696973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (!SameSign) 3697973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara Val.setIsSigned(!ECD->getInitVal().isSigned()); 3698973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (!SameWidth) 3699973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara Val = Val.extOrTrunc(Info.Ctx.getIntWidth(E->getType())); 3700973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara return Success(Val, E); 3701973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara } 3702bfbdcd861a4364bfc21a9e5047bdbd56812d6693Abramo Bagnara } 37038cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return false; 37044c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner} 37054c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner 3706a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner/// EvaluateBuiltinClassifyType - Evaluate __builtin_classify_type the same way 3707a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner/// as GCC. 3708a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattnerstatic int EvaluateBuiltinClassifyType(const CallExpr *E) { 3709a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner // The following enum mimics the values returned by GCC. 37107c80bd64032e610c0dbd74fc0ef6ea334447f2fdSebastian Redl // FIXME: Does GCC differ between lvalue and rvalue references here? 3711a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner enum gcc_type_class { 3712a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner no_type_class = -1, 3713a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner void_type_class, integer_type_class, char_type_class, 3714a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner enumeral_type_class, boolean_type_class, 3715a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner pointer_type_class, reference_type_class, offset_type_class, 3716a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner real_type_class, complex_type_class, 3717a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner function_type_class, method_type_class, 3718a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner record_type_class, union_type_class, 3719a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner array_type_class, string_type_class, 3720a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner lang_type_class 3721a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner }; 37221eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 37231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If no argument was supplied, default to "no_type_class". This isn't 3724a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner // ideal, however it is what gcc does. 3725a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner if (E->getNumArgs() == 0) 3726a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return no_type_class; 37271eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3728a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner QualType ArgTy = E->getArg(0)->getType(); 3729a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner if (ArgTy->isVoidType()) 3730a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return void_type_class; 3731a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isEnumeralType()) 3732a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return enumeral_type_class; 3733a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isBooleanType()) 3734a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return boolean_type_class; 3735a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isCharType()) 3736a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return string_type_class; // gcc doesn't appear to use char_type_class 3737a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isIntegerType()) 3738a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return integer_type_class; 3739a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isPointerType()) 3740a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return pointer_type_class; 3741a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isReferenceType()) 3742a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return reference_type_class; 3743a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isRealType()) 3744a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return real_type_class; 3745a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isComplexType()) 3746a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return complex_type_class; 3747a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isFunctionType()) 3748a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return function_type_class; 3749fb87b89fc9eb103e19fb8e4b925c23f0bd091b99Douglas Gregor else if (ArgTy->isStructureOrClassType()) 3750a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return record_type_class; 3751a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isUnionType()) 3752a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return union_type_class; 3753a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isArrayType()) 3754a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return array_type_class; 3755a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isUnionType()) 3756a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return union_type_class; 3757a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else // FIXME: offset_type_class, method_type_class, & lang_type_class? 3758b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("CallExpr::isBuiltinClassifyType(): unimplemented type"); 3759a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return -1; 3760a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner} 3761a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner 376280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// EvaluateBuiltinConstantPForLValue - Determine the result of 376380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// __builtin_constant_p when applied to the given lvalue. 376480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// 376580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// An lvalue is only "constant" if it is a pointer or reference to the first 376680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// character of a string literal. 376780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithtemplate<typename LValue> 376880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithstatic bool EvaluateBuiltinConstantPForLValue(const LValue &LV) { 376980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith const Expr *E = LV.getLValueBase().dyn_cast<const Expr*>(); 377080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return E && isa<StringLiteral>(E) && LV.getLValueOffset().isZero(); 377180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith} 377280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 377380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// EvaluateBuiltinConstantP - Evaluate __builtin_constant_p as similarly to 377480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// GCC as we can manage. 377580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithstatic bool EvaluateBuiltinConstantP(ASTContext &Ctx, const Expr *Arg) { 377680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith QualType ArgType = Arg->getType(); 377780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 377880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // __builtin_constant_p always has one operand. The rules which gcc follows 377980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // are not precisely documented, but are as follows: 378080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 378180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // - If the operand is of integral, floating, complex or enumeration type, 378280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // and can be folded to a known value of that type, it returns 1. 378380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // - If the operand and can be folded to a pointer to the first character 378480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // of a string literal (or such a pointer cast to an integral type), it 378580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // returns 1. 378680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 378780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // Otherwise, it returns 0. 378880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 378980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // FIXME: GCC also intends to return 1 for literals of aggregate types, but 379080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // its support for this does not currently work. 379180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (ArgType->isIntegralOrEnumerationType()) { 379280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith Expr::EvalResult Result; 379380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!Arg->EvaluateAsRValue(Result, Ctx) || Result.HasSideEffects) 379480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 379580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 379680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith APValue &V = Result.Val; 379780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (V.getKind() == APValue::Int) 379880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return true; 379980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 380080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return EvaluateBuiltinConstantPForLValue(V); 380180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } else if (ArgType->isFloatingType() || ArgType->isAnyComplexType()) { 380280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return Arg->isEvaluatable(Ctx); 380380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } else if (ArgType->isPointerType() || Arg->isGLValue()) { 380480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith LValue LV; 380580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith Expr::EvalStatus Status; 380680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith EvalInfo Info(Ctx, Status); 380780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if ((Arg->isGLValue() ? EvaluateLValue(Arg, LV, Info) 380880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith : EvaluatePointer(Arg, LV, Info)) && 380980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith !Status.HasSideEffects) 381080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return EvaluateBuiltinConstantPForLValue(LV); 381180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } 381280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 381380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // Anything else isn't considered to be sufficiently constant. 381480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 381580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith} 381680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 381742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall/// Retrieves the "underlying object type" of the given expression, 381842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall/// as used by __builtin_object_size. 38191bf9a9e6a5bdc0de7939908855dcddf46b661800Richard SmithQualType IntExprEvaluator::GetObjectType(APValue::LValueBase B) { 38201bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { 38211bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 382242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return VD->getType(); 38231bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith } else if (const Expr *E = B.get<const Expr*>()) { 38241bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (isa<CompoundLiteralExpr>(E)) 38251bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return E->getType(); 382642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall } 382742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 382842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return QualType(); 382942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 383042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 38318cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::TryEvaluateBuiltinObjectSize(const CallExpr *E) { 383242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall // TODO: Perhaps we should let LLVM lower this? 383342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall LValue Base; 383442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (!EvaluatePointer(E->getArg(0), Base, Info)) 383542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return false; 383642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 383742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall // If we can prove the base is null, lower to zero now. 38381bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!Base.getLValueBase()) return Success(0, E); 383942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 38401bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType T = GetObjectType(Base.getLValueBase()); 384142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (T.isNull() || 384242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isIncompleteType() || 38431357869bc5983cdfbc986db1f3d18265bb34cb0eEli Friedman T->isFunctionType() || 384442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isVariablyModifiedType() || 384542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isDependentType()) 3846f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 384742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 384842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall CharUnits Size = Info.Ctx.getTypeSizeInChars(T); 384942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall CharUnits Offset = Base.getLValueOffset(); 385042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 385142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (!Offset.isNegative() && Offset <= Size) 385242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall Size -= Offset; 385342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall else 385442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall Size = CharUnits::Zero(); 38554f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(Size, E); 385642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 385742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 38588cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitCallExpr(const CallExpr *E) { 3859180f47959a066795cc0f409433023af448bb0328Richard Smith switch (E->isBuiltinCall()) { 3860019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner default: 38618cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 386264eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 386364eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump case Builtin::BI__builtin_object_size: { 386442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (TryEvaluateBuiltinObjectSize(E)) 386542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return true; 386664eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 3867b2aaf51ed73a4774322a39a0dd59d0fe7e3258c0Eric Christopher // If evaluating the argument has side-effects we can't determine 3868b2aaf51ed73a4774322a39a0dd59d0fe7e3258c0Eric Christopher // the size of the object and lower it to unknown now. 3869393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian if (E->getArg(0)->HasSideEffects(Info.Ctx)) { 3870a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith if (E->getArg(1)->EvaluateKnownConstInt(Info.Ctx).getZExtValue() <= 1) 3871cf184655319cf7a5b811067cff9d26a5741fd161Chris Lattner return Success(-1ULL, E); 387264eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump return Success(0, E); 387364eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump } 3874c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 3875f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 387664eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump } 387764eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 3878019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_classify_type: 3879131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(EvaluateBuiltinClassifyType(E), E); 38801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 388180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith case Builtin::BI__builtin_constant_p: 388280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return Success(EvaluateBuiltinConstantP(Info.Ctx, E->getArg(0)), E); 3883e052d46f4db91f9ba572859ffc984e85cbf5d5ffRichard Smith 388421fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner case Builtin::BI__builtin_eh_return_data_regno: { 3885a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith int Operand = E->getArg(0)->EvaluateKnownConstInt(Info.Ctx).getZExtValue(); 3886bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor Operand = Info.Ctx.getTargetInfo().getEHDataRegisterNumber(Operand); 388721fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner return Success(Operand, E); 388821fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner } 3889c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman 3890c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman case Builtin::BI__builtin_expect: 3891c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman return Visit(E->getArg(0)); 389240b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith 38935726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor case Builtin::BIstrlen: 389440b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith // A call to strlen is not a constant expression. 389540b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith if (Info.getLangOpts().CPlusPlus0x) 389640b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_invalid_function) 389740b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith << /*isConstexpr*/0 << /*isConstructor*/0 << "'strlen'"; 389840b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith else 389940b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 390040b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith // Fall through. 39015726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor case Builtin::BI__builtin_strlen: 39025726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // As an extension, we support strlen() and __builtin_strlen() as constant 39035726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // expressions when the argument is a string literal. 39048cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (const StringLiteral *S 39055726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor = dyn_cast<StringLiteral>(E->getArg(0)->IgnoreParenImpCasts())) { 39065726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // The string literal may have embedded null characters. Find the first 39075726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // one and truncate there. 39085f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef Str = S->getString(); 39095f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef::size_type Pos = Str.find(0); 39105f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner if (Pos != StringRef::npos) 39115726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor Str = Str.substr(0, Pos); 39125726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor 39135726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor return Success(Str.size(), E); 39145726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor } 39155726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor 3916f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3917454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 3918454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman case Builtin::BI__atomic_is_lock_free: { 3919454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman APSInt SizeVal; 3920454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (!EvaluateInteger(E->getArg(0), SizeVal, Info)) 3921454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return false; 3922454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 3923454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // For __atomic_is_lock_free(sizeof(_Atomic(T))), if the size is a power 3924454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // of two less than the maximum inline atomic width, we know it is 3925454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // lock-free. If the size isn't a power of two, or greater than the 3926454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // maximum alignment where we promote atomics, we know it is not lock-free 3927454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // (at least not in the sense of atomic_is_lock_free). Otherwise, 3928454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // the answer can only be determined at runtime; for example, 16-byte 3929454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // atomics have lock-free implementations on some, but not all, 3930454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // x86-64 processors. 3931454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 3932454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check power-of-two. 3933454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman CharUnits Size = CharUnits::fromQuantity(SizeVal.getZExtValue()); 3934454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (!Size.isPowerOfTwo()) 3935454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#if 0 3936454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // FIXME: Suppress this folding until the ABI for the promotion width 3937454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // settles. 3938454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return Success(0, E); 3939454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#else 3940f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3941454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#endif 3942454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 3943454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#if 0 3944454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check against promotion width. 3945454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // FIXME: Suppress this folding until the ABI for the promotion width 3946454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // settles. 3947454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman unsigned PromoteWidthBits = 3948454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman Info.Ctx.getTargetInfo().getMaxAtomicPromoteWidth(); 3949454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (Size > Info.Ctx.toCharUnitsFromBits(PromoteWidthBits)) 3950454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return Success(0, E); 3951454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#endif 3952454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 3953454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check against inlining width. 3954454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman unsigned InlineWidthBits = 3955454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman Info.Ctx.getTargetInfo().getMaxAtomicInlineWidth(); 3956454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (Size <= Info.Ctx.toCharUnitsFromBits(InlineWidthBits)) 3957454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return Success(1, E); 3958454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 3959f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3960454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman } 3961019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner } 39624c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner} 3963f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3964625b80755b603d28f36fb4212c81484d87ad08d3Richard Smithstatic bool HasSameBase(const LValue &A, const LValue &B) { 3965625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!A.getLValueBase()) 3966625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return !B.getLValueBase(); 3967625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!B.getLValueBase()) 3968625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 3969625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 39701bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (A.getLValueBase().getOpaqueValue() != 39711bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith B.getLValueBase().getOpaqueValue()) { 3972625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const Decl *ADecl = GetLValueBaseDecl(A); 3973625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!ADecl) 3974625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 3975625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const Decl *BDecl = GetLValueBaseDecl(B); 39769a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (!BDecl || ADecl->getCanonicalDecl() != BDecl->getCanonicalDecl()) 3977625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 3978625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith } 3979625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 3980625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return IsGlobalLValue(A.getLValueBase()) || 3981177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith A.getLValueFrame() == B.getLValueFrame(); 3982625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith} 3983625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 3984b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattnerbool IntExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 3985c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isAssignmentOp()) 3986f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3987c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 39882de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Comma) { 39898327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getLHS()); 39908327fad71da34492d82c532f42a58cb4baff81a3Richard Smith return Visit(E->getRHS()); 3991a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 3992a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 3993a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman if (E->isLogicalOp()) { 3994a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman // These need to be handled specially because the operands aren't 3995a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman // necessarily integral 3996fcb4d09531abbf2a5cf398c2f946fb3bc2875f64Anders Carlsson bool lhsResult, rhsResult; 39971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3998c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (EvaluateAsBooleanCondition(E->getLHS(), lhsResult, Info)) { 399951fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson // We were able to evaluate the LHS, see if we can get away with not 400051fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson // evaluating the RHS: 0 && X -> 0, 1 || X -> 1 40012de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (lhsResult == (E->getOpcode() == BO_LOr)) 40023f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar return Success(lhsResult, E); 4003a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4004c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (EvaluateAsBooleanCondition(E->getRHS(), rhsResult, Info)) { 40052de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_LOr) 4006131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(lhsResult || rhsResult, E); 40074bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson else 4008131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(lhsResult && rhsResult, E); 40094bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson } 40104bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson } else { 4011f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: If both evaluations fail, we should produce the diagnostic from 4012f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // the LHS. If the LHS is non-constant and the RHS is unevaluatable, it's 4013f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // less clear how to diagnose this. 4014c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (EvaluateAsBooleanCondition(E->getRHS(), rhsResult, Info)) { 40154bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson // We can't evaluate the LHS; however, sometimes the result 40164bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson // is determined by the RHS: X && 0 -> 0, X || 1 -> 1. 4017f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (rhsResult == (E->getOpcode() == BO_LOr)) { 4018131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar // Since we weren't able to evaluate the left hand side, it 4019fcb4d09531abbf2a5cf398c2f946fb3bc2875f64Anders Carlsson // must have had side effects. 40201e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith Info.EvalStatus.HasSideEffects = true; 4021131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 4022131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(rhsResult, E); 40234bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson } 40244bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson } 4025a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 4026a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4027a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman return false; 4028c8cc9ccc7b87a7ed1749b074f6b670bcec49abc1Chris Lattner } 402954176fdb044312b4b77c3da6682d3575b3728d30Chris Lattner 4030286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson QualType LHSTy = E->getLHS()->getType(); 4031286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson QualType RHSTy = E->getRHS()->getType(); 40324087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 40334087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar if (LHSTy->isAnyComplexType()) { 40344087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar assert(RHSTy->isAnyComplexType() && "Invalid comparison"); 4035f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS, RHS; 40364087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 40374087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar if (!EvaluateComplex(E->getLHS(), LHS, Info)) 40384087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar return false; 40394087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 40404087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar if (!EvaluateComplex(E->getRHS(), RHS, Info)) 40414087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar return false; 40424087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 40434087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar if (LHS.isComplexFloat()) { 40441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump APFloat::cmpResult CR_r = 40454087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar LHS.getComplexFloatReal().compare(RHS.getComplexFloatReal()); 40461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump APFloat::cmpResult CR_i = 40474087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar LHS.getComplexFloatImag().compare(RHS.getComplexFloatImag()); 40484087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 40492de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_EQ) 4050131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((CR_r == APFloat::cmpEqual && 4051131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar CR_i == APFloat::cmpEqual), E); 4052131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar else { 40532de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall assert(E->getOpcode() == BO_NE && 4054131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar "Invalid complex comparison."); 40551eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(((CR_r == APFloat::cmpGreaterThan || 4056fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_r == APFloat::cmpLessThan || 4057fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_r == APFloat::cmpUnordered) || 40581eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump (CR_i == APFloat::cmpGreaterThan || 4059fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_i == APFloat::cmpLessThan || 4060fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_i == APFloat::cmpUnordered)), E); 4061131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 40624087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } else { 40632de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_EQ) 4064131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((LHS.getComplexIntReal() == RHS.getComplexIntReal() && 4065131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar LHS.getComplexIntImag() == RHS.getComplexIntImag()), E); 4066131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar else { 40672de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall assert(E->getOpcode() == BO_NE && 4068131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar "Invalid compex comparison."); 4069131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((LHS.getComplexIntReal() != RHS.getComplexIntReal() || 4070131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar LHS.getComplexIntImag() != RHS.getComplexIntImag()), E); 4071131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 40724087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } 40734087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } 40741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4075286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson if (LHSTy->isRealFloatingType() && 4076286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson RHSTy->isRealFloatingType()) { 4077286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson APFloat RHS(0.0), LHS(0.0); 40781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4079286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson if (!EvaluateFloat(E->getRHS(), RHS, Info)) 4080286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson return false; 40811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4082286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson if (!EvaluateFloat(E->getLHS(), LHS, Info)) 4083286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson return false; 40841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4085286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson APFloat::cmpResult CR = LHS.compare(RHS); 4086529569e68d10b0fd3750fd2124faf742249b846bAnders Carlsson 4087286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson switch (E->getOpcode()) { 4088286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson default: 4089b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Invalid binary operator!"); 40902de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LT: 4091131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpLessThan, E); 40922de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GT: 4093131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpGreaterThan, E); 40942de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LE: 4095131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpLessThan || CR == APFloat::cmpEqual, E); 40962de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GE: 40971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(CR == APFloat::cmpGreaterThan || CR == APFloat::cmpEqual, 4098131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar E); 40992de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_EQ: 4100131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpEqual, E); 41012de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_NE: 41021eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(CR == APFloat::cmpGreaterThan 4103fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang || CR == APFloat::cmpLessThan 4104fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang || CR == APFloat::cmpUnordered, E); 4105286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson } 4106286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson } 41071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4108ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman if (LHSTy->isPointerType() && RHSTy->isPointerType()) { 4109625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (E->getOpcode() == BO_Sub || E->isComparisonOp()) { 4110efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LHSValue; 41113068d117951a8df54bae9db039b56201ab10962bAnders Carlsson if (!EvaluatePointer(E->getLHS(), LHSValue, Info)) 41123068d117951a8df54bae9db039b56201ab10962bAnders Carlsson return false; 4113a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4114efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue RHSValue; 41153068d117951a8df54bae9db039b56201ab10962bAnders Carlsson if (!EvaluatePointer(E->getRHS(), RHSValue, Info)) 41163068d117951a8df54bae9db039b56201ab10962bAnders Carlsson return false; 4117a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4118625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith // Reject differing bases from the normal codepath; we special-case 4119625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith // comparisons to null. 4120625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!HasSameBase(LHSValue, RHSValue)) { 412165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (E->getOpcode() == BO_Sub) { 412265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Handle &&A - &&B. 412365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSValue.Offset.isZero() || !RHSValue.Offset.isZero()) 412465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 412565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *LHSExpr = LHSValue.Base.dyn_cast<const Expr*>(); 412665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *RHSExpr = LHSValue.Base.dyn_cast<const Expr*>(); 412765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSExpr || !RHSExpr) 412865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 412965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); 413065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); 413165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSAddrExpr || !RHSAddrExpr) 413265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 41335930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman // Make sure both labels come from the same function. 41345930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (LHSAddrExpr->getLabel()->getDeclContext() != 41355930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman RHSAddrExpr->getLabel()->getDeclContext()) 41365930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman return false; 413765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman Result = CCValue(LHSAddrExpr, RHSAddrExpr); 413865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return true; 413965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman } 41409e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // Inequalities and subtractions between unrelated pointers have 41419e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // unspecified or undefined behavior. 41425bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman if (!E->isEqualityOp()) 4143f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4144ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman // A constant address may compare equal to the address of a symbol. 4145ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman // The one exception is that address of an object cannot compare equal 4146c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // to a null pointer constant. 4147ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman if ((!LHSValue.Base && !LHSValue.Offset.isZero()) || 4148ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman (!RHSValue.Base && !RHSValue.Offset.isZero())) 4149f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 41509e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // It's implementation-defined whether distinct literals will have 4151c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // distinct addresses. In clang, we do not guarantee the addresses are 415274f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith // distinct. However, we do know that the address of a literal will be 415374f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith // non-null. 415474f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith if ((IsLiteralLValue(LHSValue) || IsLiteralLValue(RHSValue)) && 415574f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith LHSValue.Base && RHSValue.Base) 4156f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 41579e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // We can't tell whether weak symbols will end up pointing to the same 41589e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // object. 41599e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith if (IsWeakLValue(LHSValue) || IsWeakLValue(RHSValue)) 4160f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 41619e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // Pointers with different bases cannot represent the same object. 4162c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // (Note that clang defaults to -fmerge-all-constants, which can 4163c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // lead to inconsistent results for comparisons involving the address 4164c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // of a constant; this generally doesn't matter in practice.) 41659e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith return Success(E->getOpcode() == BO_NE, E); 41665bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman } 4167a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4168cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // FIXME: Implement the C++11 restrictions: 4169cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // - Pointer subtractions must be on elements of the same array. 4170cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // - Pointer comparisons must be between members with the same access. 4171cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 41722de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Sub) { 41734992bdde387c5f033bb450a716eaabc0fda52688Chris Lattner QualType Type = E->getLHS()->getType(); 41744992bdde387c5f033bb450a716eaabc0fda52688Chris Lattner QualType ElementType = Type->getAs<PointerType>()->getPointeeType(); 41753068d117951a8df54bae9db039b56201ab10962bAnders Carlsson 4176180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits ElementSize; 4177180f47959a066795cc0f409433023af448bb0328Richard Smith if (!HandleSizeof(Info, ElementType, ElementSize)) 4178180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 4179a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4180180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits Diff = LHSValue.getLValueOffset() - 4181a73058324197b7bdfd19307965954f626e26199dKen Dyck RHSValue.getLValueOffset(); 4182a73058324197b7bdfd19307965954f626e26199dKen Dyck return Success(Diff / ElementSize, E); 4183ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman } 4184625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 4185625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const CharUnits &LHSOffset = LHSValue.getLValueOffset(); 4186625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const CharUnits &RHSOffset = RHSValue.getLValueOffset(); 4187625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith switch (E->getOpcode()) { 4188625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith default: llvm_unreachable("missing comparison operator"); 4189625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_LT: return Success(LHSOffset < RHSOffset, E); 4190625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_GT: return Success(LHSOffset > RHSOffset, E); 4191625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_LE: return Success(LHSOffset <= RHSOffset, E); 4192625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_GE: return Success(LHSOffset >= RHSOffset, E); 4193625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_EQ: return Success(LHSOffset == RHSOffset, E); 4194625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_NE: return Success(LHSOffset != RHSOffset, E); 4195ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman } 41963068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 41973068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 41982ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor if (!LHSTy->isIntegralOrEnumerationType() || 41992ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor !RHSTy->isIntegralOrEnumerationType()) { 4200e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // We can't continue from here for non-integral types. 4201e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 4202a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 4203a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4204a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman // The LHS of a constant expr is always evaluated and needed. 420547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue LHSVal; 4206c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateIntegerOrLValue(E->getLHS(), LHSVal, Info)) 4207f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4208d9f4bcda18bfbf79341edd9d381d4b6a3cffe655Eli Friedman 4209c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!Visit(E->getRHS())) 421030c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return false; 421147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue &RHSVal = Result; 421242edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 421342edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman // Handle cases like (unsigned long)&a + 4. 4214c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isAdditiveOp() && LHSVal.isLValue() && RHSVal.isInt()) { 4215a73058324197b7bdfd19307965954f626e26199dKen Dyck CharUnits AdditionalOffset = CharUnits::fromQuantity( 4216a73058324197b7bdfd19307965954f626e26199dKen Dyck RHSVal.getInt().getZExtValue()); 42172de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Add) 421847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith LHSVal.getLValueOffset() += AdditionalOffset; 421942edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman else 422047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith LHSVal.getLValueOffset() -= AdditionalOffset; 422147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = LHSVal; 422242edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman return true; 422342edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman } 422442edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 422542edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman // Handle cases like 4 + (unsigned long)&a 42262de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Add && 4227c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RHSVal.isLValue() && LHSVal.isInt()) { 422847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith RHSVal.getLValueOffset() += CharUnits::fromQuantity( 422947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith LHSVal.getInt().getZExtValue()); 423047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith // Note that RHSVal is Result. 423142edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman return true; 423242edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman } 423342edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 423465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (E->getOpcode() == BO_Sub && LHSVal.isLValue() && RHSVal.isLValue()) { 423565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Handle (intptr_t)&&A - (intptr_t)&&B. 423665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSVal.getLValueOffset().isZero() || 423765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman !RHSVal.getLValueOffset().isZero()) 423865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 423965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *LHSExpr = LHSVal.getLValueBase().dyn_cast<const Expr*>(); 424065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *RHSExpr = RHSVal.getLValueBase().dyn_cast<const Expr*>(); 424165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSExpr || !RHSExpr) 424265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 424365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); 424465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); 424565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSAddrExpr || !RHSAddrExpr) 424665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 42475930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman // Make sure both labels come from the same function. 42485930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (LHSAddrExpr->getLabel()->getDeclContext() != 42495930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman RHSAddrExpr->getLabel()->getDeclContext()) 42505930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman return false; 425165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman Result = CCValue(LHSAddrExpr, RHSAddrExpr); 425265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return true; 425365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman } 425465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman 425542edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman // All the following cases expect both operands to be an integer 4256c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!LHSVal.isInt() || !RHSVal.isInt()) 4257f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4258a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4259c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith APSInt &LHS = LHSVal.getInt(); 4260c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith APSInt &RHS = RHSVal.getInt(); 426142edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 4262a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson switch (E->getOpcode()) { 426332fea9d18cc3658a1b01df5ca6f2ac302625c61dChris Lattner default: 4264f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4265c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_Mul: return Success(LHS * RHS, E); 4266c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_Add: return Success(LHS + RHS, E); 4267c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_Sub: return Success(LHS - RHS, E); 4268c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_And: return Success(LHS & RHS, E); 4269c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_Xor: return Success(LHS ^ RHS, E); 4270c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_Or: return Success(LHS | RHS, E); 42712de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 427254176fdb044312b4b77c3da6682d3575b3728d30Chris Lattner if (RHS == 0) 4273f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_expr_divide_by_zero); 4274c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Success(LHS / RHS, E); 42752de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Rem: 427654176fdb044312b4b77c3da6682d3575b3728d30Chris Lattner if (RHS == 0) 4277f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_expr_divide_by_zero); 4278c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Success(LHS % RHS, E); 42792de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shl: { 4280091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall // During constant-folding, a negative shift is an opposite shift. 4281091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall if (RHS.isSigned() && RHS.isNegative()) { 4282091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall RHS = -RHS; 4283091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall goto shift_right; 4284091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall } 4285091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall 4286091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall shift_left: 4287091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall unsigned SA 4288c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); 4289c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Success(LHS << SA, E); 42903f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 42912de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shr: { 4292091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall // During constant-folding, a negative shift is an opposite shift. 4293091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall if (RHS.isSigned() && RHS.isNegative()) { 4294091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall RHS = -RHS; 4295091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall goto shift_left; 4296091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall } 4297091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall 4298091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall shift_right: 42991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump unsigned SA = 4300c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); 4301c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Success(LHS >> SA, E); 43023f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 43031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4304c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_LT: return Success(LHS < RHS, E); 4305c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_GT: return Success(LHS > RHS, E); 4306c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_LE: return Success(LHS <= RHS, E); 4307c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_GE: return Success(LHS >= RHS, E); 4308c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_EQ: return Success(LHS == RHS, E); 4309c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_NE: return Success(LHS != RHS, E); 4310b11e77836dd0867955c5abf32baf1c3e6c7f81e1Eli Friedman } 4311a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 4312a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson 43138b752f10c394b140f9ef89e049cbad1a7676fc25Ken DyckCharUnits IntExprEvaluator::GetAlignOfType(QualType T) { 43145d484e8cf710207010720589d89602233de61d01Sebastian Redl // C++ [expr.sizeof]p2: "When applied to a reference or a reference type, 43155d484e8cf710207010720589d89602233de61d01Sebastian Redl // the result is the size of the referenced type." 43165d484e8cf710207010720589d89602233de61d01Sebastian Redl // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the 43175d484e8cf710207010720589d89602233de61d01Sebastian Redl // result shall be the alignment of the referenced type." 43185d484e8cf710207010720589d89602233de61d01Sebastian Redl if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 43195d484e8cf710207010720589d89602233de61d01Sebastian Redl T = Ref->getPointeeType(); 43209f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier 43219f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier // __alignof is defined to return the preferred alignment. 43229f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier return Info.Ctx.toCharUnitsFromBits( 43239f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier Info.Ctx.getPreferredTypeAlign(T.getTypePtr())); 4324e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner} 4325e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 43268b752f10c394b140f9ef89e049cbad1a7676fc25Ken DyckCharUnits IntExprEvaluator::GetAlignOfExpr(const Expr *E) { 4327af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner E = E->IgnoreParens(); 4328af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner 4329af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner // alignof decl is always accepted, even if it doesn't make sense: we default 43301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // to 1 in those cases. 4331af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) 43328b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck return Info.Ctx.getDeclAlign(DRE->getDecl(), 43338b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck /*RefAsPointee*/true); 4334a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4335af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) 43368b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck return Info.Ctx.getDeclAlign(ME->getMemberDecl(), 43378b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck /*RefAsPointee*/true); 4338af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner 4339e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner return GetAlignOfType(E->getType()); 4340e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner} 4341e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 4342e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 4343f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne/// VisitUnaryExprOrTypeTraitExpr - Evaluate a sizeof, alignof or vec_step with 4344f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne/// a result as the expression's type. 4345f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbournebool IntExprEvaluator::VisitUnaryExprOrTypeTraitExpr( 4346f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne const UnaryExprOrTypeTraitExpr *E) { 4347f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne switch(E->getKind()) { 4348f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_AlignOf: { 4349e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner if (E->isArgumentType()) 43504f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(GetAlignOfType(E->getArgumentType()), E); 4351e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner else 43524f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(GetAlignOfExpr(E->getArgumentExpr()), E); 4353e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner } 4354a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4355f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_VecStep: { 4356f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne QualType Ty = E->getTypeOfArgument(); 43570518999d3adcc289997bd974dce90cc97f5c1c44Sebastian Redl 4358f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (Ty->isVectorType()) { 4359f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne unsigned n = Ty->getAs<VectorType>()->getNumElements(); 4360a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4361f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // The vec_step built-in functions that take a 3-component 4362f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // vector return 4. (OpenCL 1.1 spec 6.11.12) 4363f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (n == 3) 4364f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne n = 4; 4365f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 4366f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return Success(n, E); 4367f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } else 4368f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return Success(1, E); 4369f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 4370f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 4371f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_SizeOf: { 4372f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne QualType SrcTy = E->getTypeOfArgument(); 4373f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // C++ [expr.sizeof]p2: "When applied to a reference or a reference type, 4374f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // the result is the size of the referenced type." 4375f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the 4376f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // result shall be the alignment of the referenced type." 4377f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (const ReferenceType *Ref = SrcTy->getAs<ReferenceType>()) 4378f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne SrcTy = Ref->getPointeeType(); 4379f2da9dfef96dc11b7b5effb1d02cb427b2d71599Eli Friedman 4380180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits Sizeof; 4381180f47959a066795cc0f409433023af448bb0328Richard Smith if (!HandleSizeof(Info, SrcTy, Sizeof)) 4382f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return false; 4383180f47959a066795cc0f409433023af448bb0328Richard Smith return Success(Sizeof, E); 4384f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 4385f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 4386f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 4387f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne llvm_unreachable("unknown expr/type trait"); 4388f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4389fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattner} 4390fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattner 43918cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitOffsetOfExpr(const OffsetOfExpr *OOE) { 43928ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CharUnits Result; 43938cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne unsigned n = OOE->getNumComponents(); 43948ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (n == 0) 4395f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 43968cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne QualType CurrentType = OOE->getTypeSourceInfo()->getType(); 43978ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor for (unsigned i = 0; i != n; ++i) { 43988ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor OffsetOfExpr::OffsetOfNode ON = OOE->getComponent(i); 43998ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor switch (ON.getKind()) { 44008ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Array: { 44018cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr *Idx = OOE->getIndexExpr(ON.getArrayExprIndex()); 44028ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor APSInt IdxResult; 44038ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (!EvaluateInteger(Idx, IdxResult, Info)) 44048ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor return false; 44058ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const ArrayType *AT = Info.Ctx.getAsArrayType(CurrentType); 44068ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (!AT) 4407f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 44088ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CurrentType = AT->getElementType(); 44098ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CharUnits ElementSize = Info.Ctx.getTypeSizeInChars(CurrentType); 44108ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor Result += IdxResult.getSExtValue() * ElementSize; 44118ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor break; 44128ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 4413f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 44148ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Field: { 44158ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor FieldDecl *MemberDecl = ON.getField(); 44168ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const RecordType *RT = CurrentType->getAs<RecordType>(); 4417f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!RT) 4418f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 44198ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor RecordDecl *RD = RT->getDecl(); 44208ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); 4421ba4f5d5754c8291690d01ca9581926673d69b24cJohn McCall unsigned i = MemberDecl->getFieldIndex(); 4422cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor assert(i < RL.getFieldCount() && "offsetof field in wrong type"); 4423fb1e3bc29b667f4275e1d5a43d64ec173f4f9a7dKen Dyck Result += Info.Ctx.toCharUnitsFromBits(RL.getFieldOffset(i)); 44248ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CurrentType = MemberDecl->getType().getNonReferenceType(); 44258ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor break; 44268ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 4427f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 44288ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Identifier: 44298ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor llvm_unreachable("dependent __builtin_offsetof"); 4430f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 4431f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 4432cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor case OffsetOfExpr::OffsetOfNode::Base: { 4433cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor CXXBaseSpecifier *BaseSpec = ON.getBase(); 4434cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor if (BaseSpec->isVirtual()) 4435f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 4436cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 4437cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Find the layout of the class whose base we are looking into. 4438cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const RecordType *RT = CurrentType->getAs<RecordType>(); 4439f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!RT) 4440f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 4441cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor RecordDecl *RD = RT->getDecl(); 4442cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); 4443cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 4444cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Find the base class itself. 4445cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor CurrentType = BaseSpec->getType(); 4446cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const RecordType *BaseRT = CurrentType->getAs<RecordType>(); 4447cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor if (!BaseRT) 4448f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 4449cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 4450cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Add the offset to the base. 44517c7f820d70c925b29290a8563b59615816a827fcKen Dyck Result += RL.getBaseClassOffset(cast<CXXRecordDecl>(BaseRT->getDecl())); 4452cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor break; 4453cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor } 44548ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 44558ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 44568cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return Success(Result, OOE); 44578ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor} 44588ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor 4459b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattnerbool IntExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 446075a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner switch (E->getOpcode()) { 44614c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner default: 446275a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner // Address, indirect, pre/post inc/dec, etc are not valid constant exprs. 446375a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner // See C99 6.6p3. 4464f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 44652de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Extension: 44664c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // FIXME: Should extension allow i-c-e extension expressions in its scope? 44674c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // If so, we could clear the diagnostic ID. 4468f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Visit(E->getSubExpr()); 44692de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 4470c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // The result is just the value. 4471f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Visit(E->getSubExpr()); 4472f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_Minus: { 4473f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Visit(E->getSubExpr())) 4474f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4475f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Result.isInt()) return Error(E); 4476f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(-Result.getInt(), E); 4477f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 4478f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_Not: { 4479f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Visit(E->getSubExpr())) 4480f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4481f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Result.isInt()) return Error(E); 4482f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(~Result.getInt(), E); 4483f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 4484f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_LNot: { 4485f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool bres; 4486f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateAsBooleanCondition(E->getSubExpr(), bres, Info)) 4487f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4488f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(!bres, E); 4489f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 449006a3675627e3b3c47b49c689c8e404a33144194aAnders Carlsson } 4491a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 44921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4493732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner/// HandleCast - This is used to evaluate implicit or explicit casts where the 4494732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner/// result type is integer. 44958cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitCastExpr(const CastExpr *E) { 44968cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr *SubExpr = E->getSubExpr(); 449782206e267ce6cc709797127616f64672d255b310Anders Carlsson QualType DestType = E->getType(); 4498b92dac8bc2f6f73919825f9af693a8a7e89ae1d4Daniel Dunbar QualType SrcType = SubExpr->getType(); 449982206e267ce6cc709797127616f64672d255b310Anders Carlsson 450046a523285928aa07bf14803178dc04616ac85994Eli Friedman switch (E->getCastKind()) { 450146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_BaseToDerived: 450246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_DerivedToBase: 450346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_UncheckedDerivedToBase: 450446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_Dynamic: 450546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ToUnion: 450646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ArrayToPointerDecay: 450746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FunctionToPointerDecay: 450846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NullToPointer: 450946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NullToMemberPointer: 451046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_BaseToDerivedMemberPointer: 451146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_DerivedToBaseMemberPointer: 451246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ConstructorConversion: 451346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToPointer: 451446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ToVoid: 451546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_VectorSplat: 451646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToFloating: 451746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingCast: 45181d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 45191d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 452046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_AnyPointerToBlockPointerCast: 452146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ObjCObjectLValueCast: 452246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingRealToComplex: 452346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToReal: 452446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexCast: 452546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToIntegralComplex: 452646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralRealToComplex: 452746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexCast: 452846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToFloatingComplex: 452946a523285928aa07bf14803178dc04616ac85994Eli Friedman llvm_unreachable("invalid cast kind for integral value"); 453046a523285928aa07bf14803178dc04616ac85994Eli Friedman 4531e50c297f92914ca996deb8b597624193273b62e4Eli Friedman case CK_BitCast: 453246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_Dependent: 453346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueBitCast: 453433e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 453533e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 453633e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 453733e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: 4538f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 453946a523285928aa07bf14803178dc04616ac85994Eli Friedman 45407d580a4e9e47dffc3c17aa2b957ac57ca3c4e451Richard Smith case CK_UserDefinedConversion: 454146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueToRValue: 45427a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 45437a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 454446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NoOp: 4545c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 454646a523285928aa07bf14803178dc04616ac85994Eli Friedman 454746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_MemberPointerToBoolean: 454846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_PointerToBoolean: 454946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToBoolean: 455046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingToBoolean: 455146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToBoolean: 455246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToBoolean: { 45534efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman bool BoolResult; 4554c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateAsBooleanCondition(SubExpr, BoolResult, Info)) 45554efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman return false; 4556131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(BoolResult, E); 45574efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 45584efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 455946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralCast: { 4560732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner if (!Visit(SubExpr)) 4561b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner return false; 4562a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 4563be26570e3faa009bdcefedfaf04473e518940520Eli Friedman if (!Result.isInt()) { 456465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Allow casts of address-of-label differences if they are no-ops 456565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // or narrowing. (The narrowing case isn't actually guaranteed to 456665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // be constant-evaluatable except in some narrow cases which are hard 456765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // to detect here. We let it through on the assumption the user knows 456865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // what they are doing.) 456965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (Result.isAddrLabelDiff()) 457065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return Info.Ctx.getTypeSize(DestType) <= Info.Ctx.getTypeSize(SrcType); 4571be26570e3faa009bdcefedfaf04473e518940520Eli Friedman // Only allow casts of lvalues if they are lossless. 4572be26570e3faa009bdcefedfaf04473e518940520Eli Friedman return Info.Ctx.getTypeSize(DestType) == Info.Ctx.getTypeSize(SrcType); 4573be26570e3faa009bdcefedfaf04473e518940520Eli Friedman } 457430c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar 4575dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar return Success(HandleIntToIntCast(DestType, SrcType, 457630c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar Result.getInt(), Info.Ctx), E); 4577732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner } 45781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 457946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_PointerToIntegral: { 4580c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 4581c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 4582efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 458387eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner if (!EvaluatePointer(SubExpr, LV, Info)) 4584b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner return false; 45854efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 4586dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar if (LV.getLValueBase()) { 4587dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar // Only allow based lvalue casts if they are lossless. 4588dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar if (Info.Ctx.getTypeSize(DestType) != Info.Ctx.getTypeSize(SrcType)) 4589f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4590dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar 4591b755a9da095d2f2f04444797f1e1a9511693815bRichard Smith LV.Designator.setInvalid(); 4592efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LV.moveInto(Result); 4593dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar return true; 4594dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar } 45954efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 4596a73058324197b7bdfd19307965954f626e26199dKen Dyck APSInt AsInt = Info.Ctx.MakeIntValue(LV.getLValueOffset().getQuantity(), 4597a73058324197b7bdfd19307965954f626e26199dKen Dyck SrcType); 4598dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar return Success(HandleIntToIntCast(DestType, SrcType, AsInt, Info.Ctx), E); 45992bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson } 46004efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 460146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToReal: { 4602f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue C; 46031725f683432715e5afe34d476024bd6f16eac3fcEli Friedman if (!EvaluateComplex(SubExpr, C, Info)) 46041725f683432715e5afe34d476024bd6f16eac3fcEli Friedman return false; 460546a523285928aa07bf14803178dc04616ac85994Eli Friedman return Success(C.getComplexIntReal(), E); 46061725f683432715e5afe34d476024bd6f16eac3fcEli Friedman } 46072217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman 460846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingToIntegral: { 460946a523285928aa07bf14803178dc04616ac85994Eli Friedman APFloat F(0.0); 461046a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateFloat(SubExpr, F, Info)) 461146a523285928aa07bf14803178dc04616ac85994Eli Friedman return false; 4612732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner 4613c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APSInt Value; 4614c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!HandleFloatToIntCast(Info, E, SrcType, F, DestType, Value)) 4615c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 4616c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return Success(Value, E); 461746a523285928aa07bf14803178dc04616ac85994Eli Friedman } 461846a523285928aa07bf14803178dc04616ac85994Eli Friedman } 46191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 462046a523285928aa07bf14803178dc04616ac85994Eli Friedman llvm_unreachable("unknown cast resulting in integral value"); 4621f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4622a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 46232bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 4624722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedmanbool IntExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 4625722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 4626f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LV; 4627f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateComplex(E->getSubExpr(), LV, Info)) 4628f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4629f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LV.isComplexInt()) 4630f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4631722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Success(LV.getComplexIntReal(), E); 4632722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman } 4633722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 4634722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Visit(E->getSubExpr()); 4635722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman} 4636722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 4637664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedmanbool IntExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 4638722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman if (E->getSubExpr()->getType()->isComplexIntegerType()) { 4639f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LV; 4640f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateComplex(E->getSubExpr(), LV, Info)) 4641f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4642f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LV.isComplexInt()) 4643f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4644722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Success(LV.getComplexIntImag(), E); 4645722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman } 4646722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 46478327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 4648664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman return Success(0, E); 4649664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman} 4650664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 4651ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregorbool IntExprEvaluator::VisitSizeOfPackExpr(const SizeOfPackExpr *E) { 4652ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor return Success(E->getPackLength(), E); 4653ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor} 4654ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor 4655295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redlbool IntExprEvaluator::VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) { 4656295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl return Success(E->getValue(), E); 4657295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl} 4658295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl 4659f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 4660d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman// Float Evaluation 4661d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman//===----------------------------------------------------------------------===// 4662d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 4663d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmannamespace { 4664770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass FloatExprEvaluator 46658cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<FloatExprEvaluator, bool> { 4666d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman APFloat &Result; 4667d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanpublic: 4668d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman FloatExprEvaluator(EvalInfo &info, APFloat &result) 46698cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(result) {} 4670d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 467147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith bool Success(const CCValue &V, const Expr *e) { 46728cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result = V.getFloat(); 46738cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 46748cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 4675d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 467651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 4677f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith Result = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(E->getType())); 4678f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith return true; 4679f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 4680f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 4681019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner bool VisitCallExpr(const CallExpr *E); 4682d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 46835db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar bool VisitUnaryOperator(const UnaryOperator *E); 4684d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman bool VisitBinaryOperator(const BinaryOperator *E); 4685d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman bool VisitFloatingLiteral(const FloatingLiteral *E); 46868cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E); 46872217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman 4688abd3a857ace59100305790545d1baae5877b8945John McCall bool VisitUnaryReal(const UnaryOperator *E); 4689abd3a857ace59100305790545d1baae5877b8945John McCall bool VisitUnaryImag(const UnaryOperator *E); 4690ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman 469151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // FIXME: Missing: array subscript of vector, member of vector 4692d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman}; 4693d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} // end anonymous namespace 4694d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 4695d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanstatic bool EvaluateFloat(const Expr* E, APFloat& Result, EvalInfo &Info) { 4696c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isRealFloatingType()); 46978cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return FloatExprEvaluator(Info, Result).Visit(E); 4698d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 4699d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 47004ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadstatic bool TryEvaluateBuiltinNaN(const ASTContext &Context, 4701db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall QualType ResultTy, 4702db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const Expr *Arg, 4703db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall bool SNaN, 4704db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall llvm::APFloat &Result) { 4705db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const StringLiteral *S = dyn_cast<StringLiteral>(Arg->IgnoreParenCasts()); 4706db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (!S) return false; 4707db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 4708db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const llvm::fltSemantics &Sem = Context.getFloatTypeSemantics(ResultTy); 4709db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 4710db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall llvm::APInt fill; 4711db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 4712db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall // Treat empty strings as if they were zero. 4713db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (S->getString().empty()) 4714db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall fill = llvm::APInt(32, 0); 4715db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall else if (S->getString().getAsInteger(0, fill)) 4716db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall return false; 4717db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 4718db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (SNaN) 4719db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall Result = llvm::APFloat::getSNaN(Sem, false, &fill); 4720db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall else 4721db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall Result = llvm::APFloat::getQNaN(Sem, false, &fill); 4722db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall return true; 4723db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall} 4724db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 4725019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattnerbool FloatExprEvaluator::VisitCallExpr(const CallExpr *E) { 4726180f47959a066795cc0f409433023af448bb0328Richard Smith switch (E->isBuiltinCall()) { 47278cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne default: 47288cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 47298cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 4730019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_val: 4731019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_valf: 4732019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_vall: 4733019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_inf: 4734019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_inff: 47357cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar case Builtin::BI__builtin_infl: { 47367cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar const llvm::fltSemantics &Sem = 47377cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar Info.Ctx.getFloatTypeSemantics(E->getType()); 473834a74ab81600a40c6324fd76adb724b803dfaf91Chris Lattner Result = llvm::APFloat::getInf(Sem); 473934a74ab81600a40c6324fd76adb724b803dfaf91Chris Lattner return true; 47407cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar } 47411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4742db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nans: 4743db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nansf: 4744db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nansl: 4745f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), 4746f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith true, Result)) 4747f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4748f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 4749db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 47509e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nan: 47519e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nanf: 47529e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nanl: 47534572baba9d18c275968ac113fd73b0e3c77cccb8Mike Stump // If this is __builtin_nan() turn this into a nan, otherwise we 47549e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner // can't constant fold it. 4755f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), 4756f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith false, Result)) 4757f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4758f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 47595db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar 47605db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabs: 47615db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabsf: 47625db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabsl: 47635db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (!EvaluateFloat(E->getArg(0), Result, Info)) 47645db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return false; 47651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 47665db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (Result.isNegative()) 47675db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.changeSign(); 47685db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 47695db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar 47701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Builtin::BI__builtin_copysign: 47711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Builtin::BI__builtin_copysignf: 47725db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_copysignl: { 47735db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar APFloat RHS(0.); 47745db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (!EvaluateFloat(E->getArg(0), Result, Info) || 47755db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar !EvaluateFloat(E->getArg(1), RHS, Info)) 47765db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return false; 47775db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.copySign(RHS); 47785db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 47795db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar } 4780019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner } 4781019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner} 4782019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner 4783abd3a857ace59100305790545d1baae5877b8945John McCallbool FloatExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 478443efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 478543efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman ComplexValue CV; 478643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (!EvaluateComplex(E->getSubExpr(), CV, Info)) 478743efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return false; 478843efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = CV.FloatReal; 478943efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return true; 479043efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman } 479143efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman 479243efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return Visit(E->getSubExpr()); 4793abd3a857ace59100305790545d1baae5877b8945John McCall} 4794abd3a857ace59100305790545d1baae5877b8945John McCall 4795abd3a857ace59100305790545d1baae5877b8945John McCallbool FloatExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 479643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 479743efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman ComplexValue CV; 479843efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (!EvaluateComplex(E->getSubExpr(), CV, Info)) 479943efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return false; 480043efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = CV.FloatImag; 480143efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return true; 480243efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman } 480343efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman 48048327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 480543efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(E->getType()); 480643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = llvm::APFloat::getZero(Sem); 4807abd3a857ace59100305790545d1baae5877b8945John McCall return true; 4808abd3a857ace59100305790545d1baae5877b8945John McCall} 4809abd3a857ace59100305790545d1baae5877b8945John McCall 48105db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbarbool FloatExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 48115db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar switch (E->getOpcode()) { 4812f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 48132de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 48147993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith return EvaluateFloat(E->getSubExpr(), Result, Info); 48152de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Minus: 48167993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith if (!EvaluateFloat(E->getSubExpr(), Result, Info)) 48177993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith return false; 48185db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.changeSign(); 48195db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 48205db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar } 48215db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar} 4822019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner 4823d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanbool FloatExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 4824e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) 4825e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 482696e93660124c8028a4c3bcc038ab0cdd18cd7ab2Anders Carlsson 48275db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar APFloat RHS(0.0); 4828d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman if (!EvaluateFloat(E->getLHS(), Result, Info)) 4829d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return false; 4830d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman if (!EvaluateFloat(E->getRHS(), RHS, Info)) 4831d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return false; 4832d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 4833d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman switch (E->getOpcode()) { 4834f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 48352de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 4836d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.multiply(RHS, APFloat::rmNearestTiesToEven); 4837d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return true; 48382de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 4839d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.add(RHS, APFloat::rmNearestTiesToEven); 4840d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return true; 48412de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 4842d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.subtract(RHS, APFloat::rmNearestTiesToEven); 4843d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return true; 48442de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 4845d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.divide(RHS, APFloat::rmNearestTiesToEven); 4846d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return true; 4847d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman } 4848d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 4849d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 4850d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanbool FloatExprEvaluator::VisitFloatingLiteral(const FloatingLiteral *E) { 4851d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result = E->getValue(); 4852d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return true; 4853d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 4854d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 48558cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool FloatExprEvaluator::VisitCastExpr(const CastExpr *E) { 48568cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 48571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 48582a523eec6a31955be876625819b89e8dc5def707Eli Friedman switch (E->getCastKind()) { 48592a523eec6a31955be876625819b89e8dc5def707Eli Friedman default: 4860c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 48612a523eec6a31955be876625819b89e8dc5def707Eli Friedman 48622a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_IntegralToFloating: { 48634efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman APSInt IntResult; 4864c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return EvaluateInteger(SubExpr, IntResult, Info) && 4865c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleIntToFloatCast(Info, E, SubExpr->getType(), IntResult, 4866c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith E->getType(), Result); 48674efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 48682a523eec6a31955be876625819b89e8dc5def707Eli Friedman 48692a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_FloatingCast: { 48704efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman if (!Visit(SubExpr)) 48714efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman return false; 4872c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToFloatCast(Info, E, SubExpr->getType(), E->getType(), 4873c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result); 48744efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 4875f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall 48762a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_FloatingComplexToReal: { 4877f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall ComplexValue V; 4878f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall if (!EvaluateComplex(SubExpr, V, Info)) 4879f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall return false; 4880f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall Result = V.getComplexFloatReal(); 4881f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall return true; 4882f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall } 48832a523eec6a31955be876625819b89e8dc5def707Eli Friedman } 48844efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 4885f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 48864efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 48874efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 4888d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman//===----------------------------------------------------------------------===// 4889a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar// Complex Evaluation (for float and integer) 48909ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson//===----------------------------------------------------------------------===// 48919ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 48929ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlssonnamespace { 4893770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass ComplexExprEvaluator 48948cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<ComplexExprEvaluator, bool> { 4895f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue &Result; 48961eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 48979ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlssonpublic: 4898f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexExprEvaluator(EvalInfo &info, ComplexValue &Result) 48998cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(Result) {} 49001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 490147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith bool Success(const CCValue &V, const Expr *e) { 49028cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result.setFrom(V); 49038cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 49048cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 49051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 49067ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman bool ZeroInitialization(const Expr *E); 49077ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 49088cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 49098cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne // Visitor Methods 49108cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 49119ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 49128cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitImaginaryLiteral(const ImaginaryLiteral *E); 49138cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E); 4914b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman bool VisitBinaryOperator(const BinaryOperator *E); 491596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara bool VisitUnaryOperator(const UnaryOperator *E); 49167ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman bool VisitInitListExpr(const InitListExpr *E); 4917b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman}; 4918b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} // end anonymous namespace 49191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4920b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedmanstatic bool EvaluateComplex(const Expr *E, ComplexValue &Result, 4921b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman EvalInfo &Info) { 4922c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isAnyComplexType()); 49238cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ComplexExprEvaluator(Info, Result).Visit(E); 4924b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} 4925b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 49267ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedmanbool ComplexExprEvaluator::ZeroInitialization(const Expr *E) { 4927f6c17a439f3320ac620639a3ee66dbdabb93810cEli Friedman QualType ElemTy = E->getType()->getAs<ComplexType>()->getElementType(); 49287ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (ElemTy->isRealFloatingType()) { 49297ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexFloat(); 49307ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman APFloat Zero = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(ElemTy)); 49317ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.FloatReal = Zero; 49327ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.FloatImag = Zero; 49337ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } else { 49347ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexInt(); 49357ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman APSInt Zero = Info.Ctx.MakeIntValue(0, ElemTy); 49367ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.IntReal = Zero; 49377ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.IntImag = Zero; 49387ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 49397ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return true; 49407ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman} 49417ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 49428cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool ComplexExprEvaluator::VisitImaginaryLiteral(const ImaginaryLiteral *E) { 49438cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 4944b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 4945b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (SubExpr->getType()->isRealFloatingType()) { 4946b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.makeComplexFloat(); 4947b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APFloat &Imag = Result.FloatImag; 4948b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (!EvaluateFloat(SubExpr, Imag, Info)) 4949b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 4950b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 4951b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.FloatReal = APFloat(Imag.getSemantics()); 4952b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return true; 4953b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman } else { 4954b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman assert(SubExpr->getType()->isIntegerType() && 4955b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman "Unexpected imaginary literal."); 4956b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 4957b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.makeComplexInt(); 4958b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APSInt &Imag = Result.IntImag; 4959b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (!EvaluateInteger(SubExpr, Imag, Info)) 4960b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 4961b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 4962b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.IntReal = APSInt(Imag.getBitWidth(), !Imag.isSigned()); 4963b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return true; 4964b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman } 4965b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} 4966b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 49678cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool ComplexExprEvaluator::VisitCastExpr(const CastExpr *E) { 4968b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 49698786da77984e81d48e0e1b2bd339809b1efc19f3John McCall switch (E->getCastKind()) { 49708786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BitCast: 49718786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BaseToDerived: 49728786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_DerivedToBase: 49738786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_UncheckedDerivedToBase: 49748786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_Dynamic: 49758786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ToUnion: 49768786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ArrayToPointerDecay: 49778786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FunctionToPointerDecay: 49788786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NullToPointer: 49798786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NullToMemberPointer: 49808786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BaseToDerivedMemberPointer: 49818786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_DerivedToBaseMemberPointer: 49828786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_MemberPointerToBoolean: 49838786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ConstructorConversion: 49848786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToPointer: 49858786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_PointerToIntegral: 49868786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_PointerToBoolean: 49878786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ToVoid: 49888786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_VectorSplat: 49898786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralCast: 49908786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToBoolean: 49918786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToFloating: 49928786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingToIntegral: 49938786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingToBoolean: 49948786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingCast: 49951d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 49961d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 49978786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_AnyPointerToBlockPointerCast: 49988786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ObjCObjectLValueCast: 49998786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToReal: 50008786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToBoolean: 50018786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToReal: 50028786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToBoolean: 500333e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 500433e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 500533e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 500633e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: 50078786da77984e81d48e0e1b2bd339809b1efc19f3John McCall llvm_unreachable("invalid cast kind for complex value"); 50088786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 50098786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_LValueToRValue: 50107a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 50117a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 50128786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NoOp: 5013c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 50142bb5d00fcf71a7b4d478d478be778fff0494aff6John McCall 50158786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_Dependent: 501646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueBitCast: 50178786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_UserDefinedConversion: 5018f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 50198786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 50208786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingRealToComplex: { 5021b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APFloat &Real = Result.FloatReal; 50228786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!EvaluateFloat(E->getSubExpr(), Real, Info)) 5023b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5024b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 50258786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexFloat(); 50268786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.FloatImag = APFloat(Real.getSemantics()); 50278786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 50288786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 50298786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 50308786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexCast: { 50318786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 50328786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 50338786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 50348786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 50358786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 50368786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 50378786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 5038c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToFloatCast(Info, E, From, To, Result.FloatReal) && 5039c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleFloatToFloatCast(Info, E, From, To, Result.FloatImag); 50408786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 50418786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 50428786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToIntegralComplex: { 50438786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 50448786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 50458786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 50468786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 50478786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 50488786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 50498786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexInt(); 5050c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToIntCast(Info, E, From, Result.FloatReal, 5051c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.IntReal) && 5052c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleFloatToIntCast(Info, E, From, Result.FloatImag, 5053c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.IntImag); 50548786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 50558786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 50568786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralRealToComplex: { 5057b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APSInt &Real = Result.IntReal; 50588786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!EvaluateInteger(E->getSubExpr(), Real, Info)) 5059b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 50609ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 50618786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexInt(); 50628786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.IntImag = APSInt(Real.getBitWidth(), !Real.isSigned()); 50638786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 50648786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 50658786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 50668786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexCast: { 50678786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 5068b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5069ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 50708786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 50718786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 50728786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 50731725f683432715e5afe34d476024bd6f16eac3fcEli Friedman 50748786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.IntReal = HandleIntToIntCast(To, From, Result.IntReal, Info.Ctx); 50758786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.IntImag = HandleIntToIntCast(To, From, Result.IntImag, Info.Ctx); 50768786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 50778786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 50788786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 50798786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToFloatingComplex: { 50808786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 50818786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 50828786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 50838786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 50848786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 50858786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 50868786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexFloat(); 5087c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleIntToFloatCast(Info, E, From, Result.IntReal, 5088c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.FloatReal) && 5089c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleIntToFloatCast(Info, E, From, Result.IntImag, 5090c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.FloatImag); 50918786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 5092ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson } 50931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 50948786da77984e81d48e0e1b2bd339809b1efc19f3John McCall llvm_unreachable("unknown cast resulting in complex value"); 5095f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 50969ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson} 50979ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 5098f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCallbool ComplexExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 5099e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) 51002ad226bdc847df6b6b6e4f832856478ab63bb3dcRichard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 51012ad226bdc847df6b6b6e4f832856478ab63bb3dcRichard Smith 5102f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall if (!Visit(E->getLHS())) 5103f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return false; 51041eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5105f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue RHS; 5106a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar if (!EvaluateComplex(E->getRHS(), RHS, Info)) 5107f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return false; 5108a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar 51093f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar assert(Result.isComplexFloat() == RHS.isComplexFloat() && 51103f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar "Invalid operands to binary operator."); 5111ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson switch (E->getOpcode()) { 5112f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 51132de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 5114a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar if (Result.isComplexFloat()) { 5115a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatReal().add(RHS.getComplexFloatReal(), 5116a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5117a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatImag().add(RHS.getComplexFloatImag(), 5118a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5119a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } else { 5120a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntReal() += RHS.getComplexIntReal(); 5121a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntImag() += RHS.getComplexIntImag(); 5122a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } 51233f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 51242de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 5125a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar if (Result.isComplexFloat()) { 5126a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatReal().subtract(RHS.getComplexFloatReal(), 5127a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5128a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatImag().subtract(RHS.getComplexFloatImag(), 5129a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5130a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } else { 5131a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntReal() -= RHS.getComplexIntReal(); 5132a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntImag() -= RHS.getComplexIntImag(); 5133a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } 51343f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 51352de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 51363f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar if (Result.isComplexFloat()) { 5137f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS = Result; 51383f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &LHS_r = LHS.getComplexFloatReal(); 51393f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &LHS_i = LHS.getComplexFloatImag(); 51403f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &RHS_r = RHS.getComplexFloatReal(); 51413f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &RHS_i = RHS.getComplexFloatImag(); 51421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 51433f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat Tmp = LHS_r; 51443f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_r, APFloat::rmNearestTiesToEven); 51453f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatReal() = Tmp; 51463f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_i; 51473f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 51483f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatReal().subtract(Tmp, APFloat::rmNearestTiesToEven); 51493f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar 51503f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_r; 51513f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 51523f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatImag() = Tmp; 51533f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_i; 51543f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_r, APFloat::rmNearestTiesToEven); 51553f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatImag().add(Tmp, APFloat::rmNearestTiesToEven); 51563f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar } else { 5157f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS = Result; 51581eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Result.getComplexIntReal() = 51593f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar (LHS.getComplexIntReal() * RHS.getComplexIntReal() - 51603f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar LHS.getComplexIntImag() * RHS.getComplexIntImag()); 51611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Result.getComplexIntImag() = 51623f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar (LHS.getComplexIntReal() * RHS.getComplexIntImag() + 51633f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar LHS.getComplexIntImag() * RHS.getComplexIntReal()); 51643f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar } 51653f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 516696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case BO_Div: 516796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) { 516896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara ComplexValue LHS = Result; 516996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &LHS_r = LHS.getComplexFloatReal(); 517096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &LHS_i = LHS.getComplexFloatImag(); 517196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &RHS_r = RHS.getComplexFloatReal(); 517296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &RHS_i = RHS.getComplexFloatImag(); 517396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &Res_r = Result.getComplexFloatReal(); 517496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &Res_i = Result.getComplexFloatImag(); 517596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 517696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat Den = RHS_r; 517796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Den.multiply(RHS_r, APFloat::rmNearestTiesToEven); 517896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat Tmp = RHS_i; 517996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 518096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Den.add(Tmp, APFloat::rmNearestTiesToEven); 518196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 518296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r = LHS_r; 518396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.multiply(RHS_r, APFloat::rmNearestTiesToEven); 518496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp = LHS_i; 518596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 518696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.add(Tmp, APFloat::rmNearestTiesToEven); 518796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.divide(Den, APFloat::rmNearestTiesToEven); 518896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 518996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i = LHS_i; 519096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.multiply(RHS_r, APFloat::rmNearestTiesToEven); 519196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp = LHS_r; 519296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 519396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.subtract(Tmp, APFloat::rmNearestTiesToEven); 519496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.divide(Den, APFloat::rmNearestTiesToEven); 519596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } else { 5196f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (RHS.getComplexIntReal() == 0 && RHS.getComplexIntImag() == 0) 5197f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_expr_divide_by_zero); 5198f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 519996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara ComplexValue LHS = Result; 520096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APSInt Den = RHS.getComplexIntReal() * RHS.getComplexIntReal() + 520196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara RHS.getComplexIntImag() * RHS.getComplexIntImag(); 520296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntReal() = 520396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara (LHS.getComplexIntReal() * RHS.getComplexIntReal() + 520496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara LHS.getComplexIntImag() * RHS.getComplexIntImag()) / Den; 520596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = 520696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara (LHS.getComplexIntImag() * RHS.getComplexIntReal() - 520796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara LHS.getComplexIntReal() * RHS.getComplexIntImag()) / Den; 520896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 520996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara break; 5210ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson } 5211ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 5212f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return true; 5213ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson} 5214ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 521596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnarabool ComplexExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 521696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara // Get the operand value into 'Result'. 521796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (!Visit(E->getSubExpr())) 521896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return false; 521996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 522096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara switch (E->getOpcode()) { 522196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara default: 5222f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 522396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Extension: 522496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 522596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Plus: 522696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara // The result is always just the subexpr. 522796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 522896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Minus: 522996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) { 523096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatReal().changeSign(); 523196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatImag().changeSign(); 523296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 523396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara else { 523496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntReal() = -Result.getComplexIntReal(); 523596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = -Result.getComplexIntImag(); 523696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 523796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 523896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Not: 523996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) 524096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatImag().changeSign(); 524196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara else 524296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = -Result.getComplexIntImag(); 524396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 524496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 524596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara} 524696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 52477ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedmanbool ComplexExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 52487ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (E->getNumInits() == 2) { 52497ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (E->getType()->isComplexType()) { 52507ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexFloat(); 52517ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateFloat(E->getInit(0), Result.FloatReal, Info)) 52527ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 52537ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateFloat(E->getInit(1), Result.FloatImag, Info)) 52547ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 52557ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } else { 52567ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexInt(); 52577ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateInteger(E->getInit(0), Result.IntReal, Info)) 52587ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 52597ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateInteger(E->getInit(1), Result.IntImag, Info)) 52607ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 52617ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 52627ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return true; 52637ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 52647ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return ExprEvaluatorBaseTy::VisitInitListExpr(E); 52657ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman} 52667ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 52679ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson//===----------------------------------------------------------------------===// 5268aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith// Void expression evaluation, primarily for a cast to void on the LHS of a 5269aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith// comma operator 5270aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith//===----------------------------------------------------------------------===// 5271aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5272aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithnamespace { 5273aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithclass VoidExprEvaluator 5274aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith : public ExprEvaluatorBase<VoidExprEvaluator, bool> { 5275aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithpublic: 5276aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith VoidExprEvaluator(EvalInfo &Info) : ExprEvaluatorBaseTy(Info) {} 5277aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5278aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith bool Success(const CCValue &V, const Expr *e) { return true; } 5279aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5280aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith bool VisitCastExpr(const CastExpr *E) { 5281aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith switch (E->getCastKind()) { 5282aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith default: 5283aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 5284aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith case CK_ToVoid: 5285aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith VisitIgnoredValue(E->getSubExpr()); 5286aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return true; 5287aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } 5288aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } 5289aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith}; 5290aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith} // end anonymous namespace 5291aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5292aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithstatic bool EvaluateVoid(const Expr *E, EvalInfo &Info) { 5293aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith assert(E->isRValue() && E->getType()->isVoidType()); 5294aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return VoidExprEvaluator(Info).Visit(E); 5295aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith} 5296aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5297aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith//===----------------------------------------------------------------------===// 529851f4708c00110940ca3f337961915f2ca1668375Richard Smith// Top level Expr::EvaluateAsRValue method. 5299f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 5300f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 530147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smithstatic bool Evaluate(CCValue &Result, EvalInfo &Info, const Expr *E) { 5302c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C, function designators are not lvalues, but we evaluate them as if they 5303c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // are. 5304c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isGLValue() || E->getType()->isFunctionType()) { 5305c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LValue LV; 5306c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateLValue(E, LV, Info)) 5307c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 5308c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LV.moveInto(Result); 5309c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } else if (E->getType()->isVectorType()) { 53101e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!EvaluateVector(E, Result, Info)) 531159b5da6d853b4368b984700315adf7b37de05764Nate Begeman return false; 5312575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor } else if (E->getType()->isIntegralOrEnumerationType()) { 53131e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!IntExprEvaluator(Info, Result).Visit(E)) 53146dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 5315efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->hasPointerRepresentation()) { 5316efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 5317efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluatePointer(E, LV, Info)) 53186dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 53191e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith LV.moveInto(Result); 5320efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->isRealFloatingType()) { 5321efdb83e26f9a1fd2566afe54461216cd84814d42John McCall llvm::APFloat F(0.0); 5322efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateFloat(E, F, Info)) 53236dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 532447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = CCValue(F); 5325efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->isAnyComplexType()) { 5326efdb83e26f9a1fd2566afe54461216cd84814d42John McCall ComplexValue C; 5327efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateComplex(E, C, Info)) 5328660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return false; 53291e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith C.moveInto(Result); 533069c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith } else if (E->getType()->isMemberPointerType()) { 5331e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr P; 5332e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateMemberPointer(E, P, Info)) 5333e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 5334e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith P.moveInto(Result); 5335e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 533651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } else if (E->getType()->isArrayType()) { 5337180f47959a066795cc0f409433023af448bb0328Richard Smith LValue LV; 53381bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith LV.set(E, Info.CurrentCall); 5339180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArray(E, LV, Info.CurrentCall->Temporaries[E], Info)) 5340cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 5341180f47959a066795cc0f409433023af448bb0328Richard Smith Result = Info.CurrentCall->Temporaries[E]; 534251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } else if (E->getType()->isRecordType()) { 5343180f47959a066795cc0f409433023af448bb0328Richard Smith LValue LV; 53441bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith LV.set(E, Info.CurrentCall); 5345180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateRecord(E, LV, Info.CurrentCall->Temporaries[E], Info)) 5346180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 5347180f47959a066795cc0f409433023af448bb0328Richard Smith Result = Info.CurrentCall->Temporaries[E]; 5348aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } else if (E->getType()->isVoidType()) { 5349c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) 5350c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_nonliteral) 5351c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << E->getType(); 5352c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith else 5353c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 5354aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith if (!EvaluateVoid(E, Info)) 5355aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return false; 5356c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else if (Info.getLangOpts().CPlusPlus0x) { 5357c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_nonliteral) << E->getType(); 5358c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 5359f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } else { 5360dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 5361660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return false; 5362f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5363660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump 5364660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return true; 5365660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump} 5366660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump 536769c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith/// EvaluateConstantExpression - Evaluate an expression as a constant expression 536869c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith/// in-place in an APValue. In some cases, the in-place evaluation is essential, 536969c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith/// since later initializers for an object can indirectly refer to subobjects 537069c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith/// which were initialized earlier. 537169c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smithstatic bool EvaluateConstantExpression(APValue &Result, EvalInfo &Info, 5372c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const LValue &This, const Expr *E, 5373c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CheckConstantExpressionKind CCEK) { 537451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!CheckLiteralType(Info, E)) 537551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 537651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 537751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (E->isRValue()) { 537869c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // Evaluate arrays and record types in-place, so that later initializers can 537969c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // refer to earlier-initialized members of the object. 5380180f47959a066795cc0f409433023af448bb0328Richard Smith if (E->getType()->isArrayType()) 5381180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateArray(E, This, Result, Info); 5382180f47959a066795cc0f409433023af448bb0328Richard Smith else if (E->getType()->isRecordType()) 5383180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateRecord(E, This, Result, Info); 538469c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith } 538569c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 538669c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // For any other type, in-place evaluation is unimportant. 538769c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith CCValue CoreConstResult; 538869c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return Evaluate(CoreConstResult, Info, E) && 5389c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CheckConstantExpression(Info, E, CoreConstResult, Result, CCEK); 539069c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith} 539169c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 5392f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// EvaluateAsRValue - Try to evaluate this expression, performing an implicit 5393f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// lvalue-to-rvalue cast if it is an lvalue. 5394f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateAsRValue(EvalInfo &Info, const Expr *E, APValue &Result) { 539551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!CheckLiteralType(Info, E)) 539651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 539751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 5398f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith CCValue Value; 5399f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!::Evaluate(Value, Info, E)) 5400f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5401f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 5402f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (E->isGLValue()) { 5403f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith LValue LV; 5404f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith LV.setFrom(Value); 5405f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), LV, Value)) 5406f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5407f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5408f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 5409f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // Check this core constant expression is a constant expression, and if so, 5410f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // convert it to one. 5411f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return CheckConstantExpression(Info, E, Value, Result); 5412f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 5413c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 541451f4708c00110940ca3f337961915f2ca1668375Richard Smith/// EvaluateAsRValue - Return true if this is a constant which we can fold using 541556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall/// any crazy technique (that has nothing to do with language standards) that 541656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall/// we want to. If this function returns true, it returns the folded constant 5417c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// in Result. If this expression is a glvalue, an lvalue-to-rvalue conversion 5418c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// will be applied to the result. 541951f4708c00110940ca3f337961915f2ca1668375Richard Smithbool Expr::EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const { 5420ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith // Fast-path evaluations of integer literals, since we sometimes see files 5421ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith // containing vast quantities of these. 5422ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith if (const IntegerLiteral *L = dyn_cast<IntegerLiteral>(this)) { 5423ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith Result.Val = APValue(APSInt(L->getValue(), 5424ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith L->getType()->isUnsignedIntegerType())); 5425ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith return true; 5426ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith } 5427ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith 54282d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // FIXME: Evaluating values of large array and record types can cause 54292d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // performance problems. Only do so in C++11 for now. 5430e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isRValue() && (getType()->isArrayType() || getType()->isRecordType()) && 5431e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith !Ctx.getLangOptions().CPlusPlus0x) 54321445bbacf4c8de5f208ff4ccb302424a4d9e233eRichard Smith return false; 54331445bbacf4c8de5f208ff4ccb302424a4d9e233eRichard Smith 5434f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith EvalInfo Info(Ctx, Result); 5435f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ::EvaluateAsRValue(Info, this, Result.Val); 543656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall} 543756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 54384ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::EvaluateAsBooleanCondition(bool &Result, 54394ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foad const ASTContext &Ctx) const { 5440c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalResult Scratch; 544151f4708c00110940ca3f337961915f2ca1668375Richard Smith return EvaluateAsRValue(Scratch, Ctx) && 5442b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleConversionToBool(CCValue(const_cast<ASTContext&>(Ctx), 5443b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Scratch.Val, CCValue::GlobalValue()), 544447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result); 5445cd7a445c6b46c5585580dfb652300c8483c0cb6bJohn McCall} 5446cd7a445c6b46c5585580dfb652300c8483c0cb6bJohn McCall 544780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithbool Expr::EvaluateAsInt(APSInt &Result, const ASTContext &Ctx, 544880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith SideEffectsKind AllowSideEffects) const { 544980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!getType()->isIntegralOrEnumerationType()) 545080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 545180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 5452c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalResult ExprResult; 545380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!EvaluateAsRValue(ExprResult, Ctx) || !ExprResult.Val.isInt() || 545480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith (!AllowSideEffects && ExprResult.HasSideEffects)) 5455c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 5456f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 5457c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = ExprResult.Val.getInt(); 5458c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return true; 5459a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith} 5460a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith 54614ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const { 54621b78276a75a5a0f496a82429c1ff9604d622a76dAnders Carlsson EvalInfo Info(Ctx, Result); 54631b78276a75a5a0f496a82429c1ff9604d622a76dAnders Carlsson 5464efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 54659a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith return EvaluateLValue(this, LV, Info) && !Result.HasSideEffects && 5466c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CheckLValueConstantExpression(Info, this, LV, Result.Val, 5467c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_Constant); 5468b2f295c8050fb8c141bf2cf38eed0a56e99d0092Eli Friedman} 5469b2f295c8050fb8c141bf2cf38eed0a56e99d0092Eli Friedman 5470099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithbool Expr::EvaluateAsInitializer(APValue &Value, const ASTContext &Ctx, 5471099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const VarDecl *VD, 5472099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith llvm::SmallVectorImpl<PartialDiagnosticAt> &Notes) const { 54732d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // FIXME: Evaluating initializers for large array and record types can cause 54742d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // performance problems. Only do so in C++11 for now. 54752d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith if (isRValue() && (getType()->isArrayType() || getType()->isRecordType()) && 54762d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith !Ctx.getLangOptions().CPlusPlus0x) 54772d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith return false; 54782d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith 5479099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Expr::EvalStatus EStatus; 5480099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EStatus.Diag = &Notes; 5481099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 5482099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EvalInfo InitInfo(Ctx, EStatus); 5483099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith InitInfo.setEvaluatingDecl(VD, Value); 5484099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 548551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!CheckLiteralType(InitInfo, this)) 548651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 548751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 5488099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith LValue LVal; 5489099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith LVal.set(VD); 5490099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 549151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // C++11 [basic.start.init]p2: 549251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Variables with static storage duration or thread storage duration shall be 549351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // zero-initialized before any other initialization takes place. 549451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // This behavior is not present in C. 549551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (Ctx.getLangOptions().CPlusPlus && !VD->hasLocalStorage() && 549651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith !VD->getType()->isReferenceType()) { 549751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(VD->getType()); 549851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!EvaluateConstantExpression(Value, InitInfo, LVal, &VIE)) 549951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 550051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 550151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 5502099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return EvaluateConstantExpression(Value, InitInfo, LVal, this) && 5503099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith !EStatus.HasSideEffects; 5504099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith} 5505099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 550651f4708c00110940ca3f337961915f2ca1668375Richard Smith/// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 550751f4708c00110940ca3f337961915f2ca1668375Richard Smith/// constant folded, but discard the result. 55084ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::isEvaluatable(const ASTContext &Ctx) const { 55094fdfb0965b396f2778091f7e6c051d17ff9791baAnders Carlsson EvalResult Result; 551051f4708c00110940ca3f337961915f2ca1668375Richard Smith return EvaluateAsRValue(Result, Ctx) && !Result.HasSideEffects; 551145b6b9d080ac56917337d73d8f1cd6374b27b05dChris Lattner} 551251fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson 55134ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::HasSideEffects(const ASTContext &Ctx) const { 55141e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith return HasSideEffect(Ctx).Visit(this); 5515393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian} 5516393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian 5517a6b8b2c09610b8bc4330e948ece8b940c2386406Richard SmithAPSInt Expr::EvaluateKnownConstInt(const ASTContext &Ctx) const { 55181c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson EvalResult EvalResult; 551951f4708c00110940ca3f337961915f2ca1668375Richard Smith bool Result = EvaluateAsRValue(EvalResult, Ctx); 5520c6ed729f669044f5072a49d79041f455d971ece3Jeffrey Yasskin (void)Result; 552151fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson assert(Result && "Could not evaluate expression"); 55221c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson assert(EvalResult.Val.isInt() && "Expression did not evaluate to integer"); 552351fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson 55241c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson return EvalResult.Val.getInt(); 552551fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson} 5526d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5527e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara bool Expr::EvalResult::isGlobalLValue() const { 5528e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara assert(Val.isLValue()); 5529e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara return IsGlobalLValue(Val.getLValueBase()); 5530e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara } 5531e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara 5532e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara 5533d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// isIntegerConstantExpr - this recursive routine will test if an expression is 5534d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// an integer constant expression. 5535d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5536d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 5537d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// comma, etc 5538d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// 5539d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof 5540d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer 5541d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// cast+dereference. 5542d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5543d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// CheckICE - This function does the fundamental ICE checking: the returned 5544d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation. 5545d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// Note that to reduce code duplication, this helper does no evaluation 5546d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// itself; the caller checks whether the expression is evaluatable, and 5547d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// in the rare cases where CheckICE actually cares about the evaluated 5548d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// value, it calls into Evalute. 5549d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 5550d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// Meanings of Val: 555151f4708c00110940ca3f337961915f2ca1668375Richard Smith// 0: This expression is an ICE. 5552d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 1: This expression is not an ICE, but if it isn't evaluated, it's 5553d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// a legal subexpression for an ICE. This return value is used to handle 5554d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// the comma operator in C99 mode. 5555d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 2: This expression is not an ICE, and is not a legal subexpression for one. 5556d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 55573c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmannamespace { 55583c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 5559d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstruct ICEDiag { 5560d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall unsigned Val; 5561d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall SourceLocation Loc; 5562d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5563d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall public: 5564d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {} 5565d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag() : Val(0) {} 5566d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall}; 5567d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 55683c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman} 55693c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 55703c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmanstatic ICEDiag NoDiag() { return ICEDiag(); } 5571d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5572d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstatic ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) { 5573d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall Expr::EvalResult EVResult; 557451f4708c00110940ca3f337961915f2ca1668375Richard Smith if (!E->EvaluateAsRValue(EVResult, Ctx) || EVResult.HasSideEffects || 5575d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall !EVResult.Val.isInt()) { 5576d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 5577d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5578d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 5579d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 5580d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5581d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstatic ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) { 5582d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall assert(!E->isValueDependent() && "Should not see value dependent exprs!"); 55832ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor if (!E->getType()->isIntegralOrEnumerationType()) { 5584d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 5585d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5586d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5587d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (E->getStmtClass()) { 558863c00d7f35fa060c0a446c9df3a4402d9c7757feJohn McCall#define ABSTRACT_STMT(Node) 5589d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#define STMT(Node, Base) case Expr::Node##Class: 5590d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#define EXPR(Node, Base) 5591d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#include "clang/AST/StmtNodes.inc" 5592d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::PredefinedExprClass: 5593d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::FloatingLiteralClass: 5594d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImaginaryLiteralClass: 5595d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::StringLiteralClass: 5596d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ArraySubscriptExprClass: 5597d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::MemberExprClass: 5598d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CompoundAssignOperatorClass: 5599d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CompoundLiteralExprClass: 5600d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ExtVectorElementExprClass: 5601d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DesignatedInitExprClass: 5602d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImplicitValueInitExprClass: 5603d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ParenListExprClass: 5604d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::VAArgExprClass: 5605d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::AddrLabelExprClass: 5606d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::StmtExprClass: 5607d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXMemberCallExprClass: 5608e08ce650a2b02410eddd1f60a4aa6b3d4be71e73Peter Collingbourne case Expr::CUDAKernelCallExprClass: 5609d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDynamicCastExprClass: 5610d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXTypeidExprClass: 56119be88403e965cc49af76c9d33d818781d44b333eFrancois Pichet case Expr::CXXUuidofExprClass: 5612d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXNullPtrLiteralExprClass: 5613d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXThisExprClass: 5614d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXThrowExprClass: 5615d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXNewExprClass: 5616d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDeleteExprClass: 5617d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXPseudoDestructorExprClass: 5618d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnresolvedLookupExprClass: 5619d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DependentScopeDeclRefExprClass: 5620d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXConstructExprClass: 5621d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXBindTemporaryExprClass: 56224765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall case Expr::ExprWithCleanupsClass: 5623d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXTemporaryObjectExprClass: 5624d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXUnresolvedConstructExprClass: 5625d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDependentScopeMemberExprClass: 5626d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnresolvedMemberExprClass: 5627d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCStringLiteralClass: 5628d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCEncodeExprClass: 5629d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCMessageExprClass: 5630d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCSelectorExprClass: 5631d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCProtocolExprClass: 5632d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCIvarRefExprClass: 5633d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCPropertyRefExprClass: 5634d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCIsaExprClass: 5635d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ShuffleVectorExprClass: 5636d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BlockExprClass: 5637d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BlockDeclRefExprClass: 5638d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::NoStmtClass: 56397cd7d1ad33fdf49eef83942e8855fe20d95aa1b9John McCall case Expr::OpaqueValueExprClass: 5640be230c36e32142cbdcdbe9c97511d097beeecbabDouglas Gregor case Expr::PackExpansionExprClass: 5641c7793c73ba8a343de3f2552d984851985a46f159Douglas Gregor case Expr::SubstNonTypeTemplateParmPackExprClass: 564261eee0ca33b29e102f11bab77c8b74cc00e2392bTanya Lattner case Expr::AsTypeExprClass: 5643f85e193739c953358c865005855253af4f68a497John McCall case Expr::ObjCIndirectCopyRestoreExprClass: 564403e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor case Expr::MaterializeTemporaryExprClass: 56454b9c2d235fb9449e249d74f48ecfec601650de93John McCall case Expr::PseudoObjectExprClass: 5646276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Expr::AtomicExprClass: 5647cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl case Expr::InitListExprClass: 5648cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl return ICEDiag(2, E->getLocStart()); 5649cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 5650ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor case Expr::SizeOfPackExprClass: 5651d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::GNUNullExprClass: 5652d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // GCC considers the GNU __null value to be an integral constant expression. 5653d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 5654d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 565591a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall case Expr::SubstNonTypeTemplateParmExprClass: 565691a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall return 565791a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall CheckICE(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement(), Ctx); 565891a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall 5659d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ParenExprClass: 5660d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); 5661f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne case Expr::GenericSelectionExprClass: 5662f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne return CheckICE(cast<GenericSelectionExpr>(E)->getResultExpr(), Ctx); 5663d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::IntegerLiteralClass: 5664d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CharacterLiteralClass: 5665d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXBoolLiteralExprClass: 5666ed8abf18329df67b0abcbb3a10458bd8c1d2a595Douglas Gregor case Expr::CXXScalarValueInitExprClass: 5667d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnaryTypeTraitExprClass: 56686ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet case Expr::BinaryTypeTraitExprClass: 566921ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley case Expr::ArrayTypeTraitExprClass: 5670552622067dc45013d240f73952fece703f5e63bdJohn Wiegley case Expr::ExpressionTraitExprClass: 56712e156225a29407a50dd19041aa5750171ad44ea3Sebastian Redl case Expr::CXXNoexceptExprClass: 5672d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 5673d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CallExprClass: 56746cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt case Expr::CXXOperatorCallExprClass: { 567505830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows function calls within unevaluated subexpressions of 567605830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // constant expressions, but they can never be ICEs because an ICE cannot 567705830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // contain an operand of (pointer to) function type. 5678d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const CallExpr *CE = cast<CallExpr>(E); 5679180f47959a066795cc0f409433023af448bb0328Richard Smith if (CE->isBuiltinCall()) 5680d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckEvalInICE(E, Ctx); 5681d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 5682d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5683d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DeclRefExprClass: 5684d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) 5685d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 568603f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith if (Ctx.getLangOptions().CPlusPlus && IsConstNonVolatile(E->getType())) { 5687d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const NamedDecl *D = cast<DeclRefExpr>(E)->getDecl(); 5688d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5689d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Parameter variables are never constants. Without this check, 5690d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // getAnyInitializer() can find a default argument, which leads 5691d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // to chaos. 5692d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (isa<ParmVarDecl>(D)) 5693d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 5694d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5695d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // C++ 7.1.5.1p2 5696d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // A variable of non-volatile const-qualified integral or enumeration 5697d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // type initialized by an ICE can be used in ICEs. 5698d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (const VarDecl *Dcl = dyn_cast<VarDecl>(D)) { 5699db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith if (!Dcl->getType()->isIntegralOrEnumerationType()) 5700db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 5701db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith 5702099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const VarDecl *VD; 5703099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Look for a declaration of this variable that has an initializer, and 5704099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // check whether it is an ICE. 5705099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (Dcl->getAnyInitializer(VD) && VD->checkInitIsICE()) 5706099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return NoDiag(); 5707099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith else 5708099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 5709d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5710d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5711d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 5712d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnaryOperatorClass: { 5713d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const UnaryOperator *Exp = cast<UnaryOperator>(E); 5714d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (Exp->getOpcode()) { 57152de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PostInc: 57162de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PostDec: 57172de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PreInc: 57182de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PreDec: 57192de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_AddrOf: 57202de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Deref: 572105830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows increment and decrement within unevaluated 572205830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // subexpressions of constant expressions, but they can never be ICEs 572305830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // because an ICE cannot contain an lvalue operand. 5724d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 57252de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Extension: 57262de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_LNot: 57272de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 57282de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Minus: 57292de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Not: 57302de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Real: 57312de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Imag: 5732d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(Exp->getSubExpr(), Ctx); 5733d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5734d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5735d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // OffsetOf falls through here. 5736d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5737d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::OffsetOfExprClass: { 5738d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Note that per C99, offsetof must be an ICE. And AFAIK, using 573951f4708c00110940ca3f337961915f2ca1668375Richard Smith // EvaluateAsRValue matches the proposed gcc behavior for cases like 574005830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // "offsetof(struct s{int x[4];}, x[1.0])". This doesn't affect 5741d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // compliance: we should warn earlier for offsetof expressions with 5742d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // array subscripts that aren't ICEs, and if the array subscripts 5743d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // are ICEs, the value of the offsetof must be an integer constant. 5744d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckEvalInICE(E, Ctx); 5745d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5746f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case Expr::UnaryExprOrTypeTraitExprClass: { 5747f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne const UnaryExprOrTypeTraitExpr *Exp = cast<UnaryExprOrTypeTraitExpr>(E); 5748f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if ((Exp->getKind() == UETT_SizeOf) && 5749f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne Exp->getTypeOfArgument()->isVariableArrayType()) 5750d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 5751d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 5752d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5753d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BinaryOperatorClass: { 5754d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const BinaryOperator *Exp = cast<BinaryOperator>(E); 5755d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (Exp->getOpcode()) { 57562de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_PtrMemD: 57572de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_PtrMemI: 57582de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Assign: 57592de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_MulAssign: 57602de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_DivAssign: 57612de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_RemAssign: 57622de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_AddAssign: 57632de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_SubAssign: 57642de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_ShlAssign: 57652de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_ShrAssign: 57662de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_AndAssign: 57672de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_XorAssign: 57682de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_OrAssign: 576905830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows assignments within unevaluated subexpressions of 577005830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // constant expressions, but they can never be ICEs because an ICE cannot 577105830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // contain an lvalue operand. 5772d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 5773d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 57742de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 57752de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 57762de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Rem: 57772de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 57782de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 57792de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shl: 57802de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shr: 57812de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LT: 57822de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GT: 57832de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LE: 57842de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GE: 57852de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_EQ: 57862de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_NE: 57872de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_And: 57882de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Xor: 57892de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Or: 57902de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Comma: { 5791d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 5792d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 57932de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (Exp->getOpcode() == BO_Div || 57942de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall Exp->getOpcode() == BO_Rem) { 579551f4708c00110940ca3f337961915f2ca1668375Richard Smith // EvaluateAsRValue gives an error for undefined Div/Rem, so make sure 5796d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // we don't evaluate one. 57973b332ab132fa85c83833d74d400f6e126f52fbd2John McCall if (LHSResult.Val == 0 && RHSResult.Val == 0) { 5798a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt REval = Exp->getRHS()->EvaluateKnownConstInt(Ctx); 5799d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (REval == 0) 5800d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 5801d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (REval.isSigned() && REval.isAllOnesValue()) { 5802a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt LEval = Exp->getLHS()->EvaluateKnownConstInt(Ctx); 5803d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LEval.isMinSignedValue()) 5804d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 5805d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5806d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5807d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 58082de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (Exp->getOpcode() == BO_Comma) { 5809d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (Ctx.getLangOptions().C99) { 5810d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // C99 6.6p3 introduces a strange edge case: comma can be in an ICE 5811d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // if it isn't evaluated. 5812d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val == 0 && RHSResult.Val == 0) 5813d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 5814d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } else { 5815d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // In both C89 and C++, commas in ICEs are illegal. 5816d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 5817d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5818d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5819d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val >= RHSResult.Val) 5820d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return LHSResult; 5821d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 5822d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 58232de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LAnd: 58242de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LOr: { 5825d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 5826d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 5827d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val == 0 && RHSResult.Val == 1) { 5828d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Rare case where the RHS has a comma "side-effect"; we need 5829d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // to actually check the condition to see whether the side 5830d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // with the comma is evaluated. 58312de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if ((Exp->getOpcode() == BO_LAnd) != 5832a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith (Exp->getLHS()->EvaluateKnownConstInt(Ctx) == 0)) 5833d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 5834d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 5835d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5836d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5837d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val >= RHSResult.Val) 5838d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return LHSResult; 5839d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 5840d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5841d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5842d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5843d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImplicitCastExprClass: 5844d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CStyleCastExprClass: 5845d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXFunctionalCastExprClass: 5846d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXStaticCastExprClass: 5847d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXReinterpretCastExprClass: 584832cb47174304bc7ec11478b9497c4e10f48273d9Richard Smith case Expr::CXXConstCastExprClass: 5849f85e193739c953358c865005855253af4f68a497John McCall case Expr::ObjCBridgedCastExprClass: { 5850d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); 58512116b144cf07f2574d20517187eb8863645376ebRichard Smith if (isa<ExplicitCastExpr>(E)) { 58522116b144cf07f2574d20517187eb8863645376ebRichard Smith if (const FloatingLiteral *FL 58532116b144cf07f2574d20517187eb8863645376ebRichard Smith = dyn_cast<FloatingLiteral>(SubExpr->IgnoreParenImpCasts())) { 58542116b144cf07f2574d20517187eb8863645376ebRichard Smith unsigned DestWidth = Ctx.getIntWidth(E->getType()); 58552116b144cf07f2574d20517187eb8863645376ebRichard Smith bool DestSigned = E->getType()->isSignedIntegerOrEnumerationType(); 58562116b144cf07f2574d20517187eb8863645376ebRichard Smith APSInt IgnoredVal(DestWidth, !DestSigned); 58572116b144cf07f2574d20517187eb8863645376ebRichard Smith bool Ignored; 58582116b144cf07f2574d20517187eb8863645376ebRichard Smith // If the value does not fit in the destination type, the behavior is 58592116b144cf07f2574d20517187eb8863645376ebRichard Smith // undefined, so we are not required to treat it as a constant 58602116b144cf07f2574d20517187eb8863645376ebRichard Smith // expression. 58612116b144cf07f2574d20517187eb8863645376ebRichard Smith if (FL->getValue().convertToInteger(IgnoredVal, 58622116b144cf07f2574d20517187eb8863645376ebRichard Smith llvm::APFloat::rmTowardZero, 58632116b144cf07f2574d20517187eb8863645376ebRichard Smith &Ignored) & APFloat::opInvalidOp) 58642116b144cf07f2574d20517187eb8863645376ebRichard Smith return ICEDiag(2, E->getLocStart()); 58652116b144cf07f2574d20517187eb8863645376ebRichard Smith return NoDiag(); 58662116b144cf07f2574d20517187eb8863645376ebRichard Smith } 58672116b144cf07f2574d20517187eb8863645376ebRichard Smith } 5868eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman switch (cast<CastExpr>(E)->getCastKind()) { 5869eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_LValueToRValue: 58707a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 58717a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 5872eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_NoOp: 5873eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_IntegralToBoolean: 5874eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_IntegralCast: 5875d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(SubExpr, Ctx); 5876eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman default: 5877eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman return ICEDiag(2, E->getLocStart()); 5878eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman } 5879d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 588056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall case Expr::BinaryConditionalOperatorClass: { 588156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall const BinaryConditionalOperator *Exp = cast<BinaryConditionalOperator>(E); 588256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ICEDiag CommonResult = CheckICE(Exp->getCommon(), Ctx); 588356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (CommonResult.Val == 2) return CommonResult; 588456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 588556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (FalseResult.Val == 2) return FalseResult; 588656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (CommonResult.Val == 1) return CommonResult; 588756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (FalseResult.Val == 1 && 5888a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith Exp->getCommon()->EvaluateKnownConstInt(Ctx) == 0) return NoDiag(); 588956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall return FalseResult; 589056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 5891d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ConditionalOperatorClass: { 5892d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const ConditionalOperator *Exp = cast<ConditionalOperator>(E); 5893d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // If the condition (ignoring parens) is a __builtin_constant_p call, 5894d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // then only the true side is actually considered in an integer constant 5895d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // expression, and it is fully evaluated. This is an important GNU 5896d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // extension. See GCC PR38377 for discussion. 5897d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (const CallExpr *CallCE 5898d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) 589980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (CallCE->isBuiltinCall() == Builtin::BI__builtin_constant_p) 590080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return CheckEvalInICE(E, Ctx); 5901d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); 5902d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (CondResult.Val == 2) 5903d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CondResult; 590463fe6814f339df30b8463b39995947cbdf920e48Douglas Gregor 5905f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); 5906f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 590763fe6814f339df30b8463b39995947cbdf920e48Douglas Gregor 5908d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (TrueResult.Val == 2) 5909d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return TrueResult; 5910d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (FalseResult.Val == 2) 5911d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return FalseResult; 5912d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (CondResult.Val == 1) 5913d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CondResult; 5914d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (TrueResult.Val == 0 && FalseResult.Val == 0) 5915d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 5916d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Rare case where the diagnostics depend on which side is evaluated 5917d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Note that if we get here, CondResult is 0, and at least one of 5918d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // TrueResult and FalseResult is non-zero. 5919a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith if (Exp->getCond()->EvaluateKnownConstInt(Ctx) == 0) { 5920d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return FalseResult; 5921d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5922d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return TrueResult; 5923d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5924d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDefaultArgExprClass: 5925d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); 5926d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ChooseExprClass: { 5927d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx); 5928d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5929d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5930d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5931d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Silence a GCC warning 5932d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 5933d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 5934d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 5935f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Evaluate an expression as a C++11 integral constant expression. 5936f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateCPlusPlus11IntegralConstantExpr(ASTContext &Ctx, 5937f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const Expr *E, 5938f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith llvm::APSInt *Value, 5939f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith SourceLocation *Loc) { 5940f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!E->getType()->isIntegralOrEnumerationType()) { 5941f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Loc) *Loc = E->getExprLoc(); 5942f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5943f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5944f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 59454c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith APValue Result; 59464c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!E->isCXX11ConstantExpr(Ctx, &Result, Loc)) 5947dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return false; 5948dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 59494c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith assert(Result.isInt() && "pointer cast to int is not an ICE"); 59504c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Value) *Value = Result.getInt(); 5951dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return true; 5952f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 5953f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 5954dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smithbool Expr::isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc) const { 5955f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Ctx.getLangOptions().CPlusPlus0x) 5956f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, 0, Loc); 5957f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 5958d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag d = CheckICE(this, Ctx); 5959d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (d.Val != 0) { 5960d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (Loc) *Loc = d.Loc; 5961d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return false; 5962d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 5963f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 5964f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 5965f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 5966f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithbool Expr::isIntegerConstantExpr(llvm::APSInt &Value, ASTContext &Ctx, 5967f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith SourceLocation *Loc, bool isEvaluated) const { 5968f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Ctx.getLangOptions().CPlusPlus0x) 5969f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, &Value, Loc); 5970f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 5971f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!isIntegerConstantExpr(Ctx, Loc)) 5972f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5973f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateAsInt(Value, Ctx)) 5974d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall llvm_unreachable("ICE cannot be evaluated!"); 5975d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return true; 5976d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 59774c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 59784c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smithbool Expr::isCXX11ConstantExpr(ASTContext &Ctx, APValue *Result, 59794c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith SourceLocation *Loc) const { 59804c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // We support this checking in C++98 mode in order to diagnose compatibility 59814c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // issues. 59824c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith assert(Ctx.getLangOptions().CPlusPlus); 59834c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 59844c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Expr::EvalStatus Status; 59854c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 59864c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Status.Diag = &Diags; 59874c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith EvalInfo Info(Ctx, Status); 59884c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 59894c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith APValue Scratch; 59904c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith bool IsConstExpr = ::EvaluateAsRValue(Info, this, Result ? *Result : Scratch); 59914c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 59924c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!Diags.empty()) { 59934c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith IsConstExpr = false; 59944c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Loc) *Loc = Diags[0].first; 59954c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith } else if (!IsConstExpr) { 59964c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // FIXME: This shouldn't happen. 59974c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Loc) *Loc = getExprLoc(); 59984c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith } 59994c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 60004c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith return IsConstExpr; 60014c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith} 6002