Chris Lattner | 566b6ce | 2007-08-24 02:22:53 +0000 | [diff] [blame] | 1 | //===--- CGExprAgg.cpp - Emit LLVM Code from Aggregate Expressions --------===// |
Chris Lattner | af6f528 | 2007-08-10 20:13:28 +0000 | [diff] [blame] | 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
Chris Lattner | 0bc735f | 2007-12-29 19:59:25 +0000 | [diff] [blame] | 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
Chris Lattner | af6f528 | 2007-08-10 20:13:28 +0000 | [diff] [blame] | 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // This contains code to emit Aggregate Expr nodes as LLVM code. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "CodeGenFunction.h" |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 15 | #include "CodeGenModule.h" |
Fariborz Jahanian | 082b02e | 2009-07-08 01:18:33 +0000 | [diff] [blame] | 16 | #include "CGObjCRuntime.h" |
Daniel Dunbar | de7fb84 | 2008-08-11 05:00:27 +0000 | [diff] [blame] | 17 | #include "clang/AST/ASTContext.h" |
Anders Carlsson | b14095a | 2009-04-17 00:06:03 +0000 | [diff] [blame] | 18 | #include "clang/AST/DeclCXX.h" |
Daniel Dunbar | de7fb84 | 2008-08-11 05:00:27 +0000 | [diff] [blame] | 19 | #include "clang/AST/StmtVisitor.h" |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 20 | #include "llvm/Constants.h" |
| 21 | #include "llvm/Function.h" |
Devang Patel | 636c3d0 | 2007-10-26 17:44:44 +0000 | [diff] [blame] | 22 | #include "llvm/GlobalVariable.h" |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 23 | #include "llvm/Intrinsics.h" |
Chris Lattner | af6f528 | 2007-08-10 20:13:28 +0000 | [diff] [blame] | 24 | using namespace clang; |
| 25 | using namespace CodeGen; |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 26 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 27 | //===----------------------------------------------------------------------===// |
| 28 | // Aggregate Expression Emitter |
| 29 | //===----------------------------------------------------------------------===// |
| 30 | |
| 31 | namespace { |
Benjamin Kramer | 85b4521 | 2009-11-28 19:45:26 +0000 | [diff] [blame] | 32 | class AggExprEmitter : public StmtVisitor<AggExprEmitter> { |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 33 | CodeGenFunction &CGF; |
Daniel Dunbar | 45d196b | 2008-11-01 01:53:16 +0000 | [diff] [blame] | 34 | CGBuilderTy &Builder; |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 35 | AggValueSlot Dest; |
Mike Stump | 49d1cd5 | 2009-05-26 22:03:21 +0000 | [diff] [blame] | 36 | bool IgnoreResult; |
John McCall | ef072fd | 2010-05-22 01:48:05 +0000 | [diff] [blame] | 37 | |
| 38 | ReturnValueSlot getReturnValueSlot() const { |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 39 | // If the destination slot requires garbage collection, we can't |
| 40 | // use the real return value slot, because we have to use the GC |
| 41 | // API. |
John McCall | d1a5f13 | 2010-09-16 03:13:23 +0000 | [diff] [blame] | 42 | if (Dest.requiresGCollection()) return ReturnValueSlot(); |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 43 | |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 44 | return ReturnValueSlot(Dest.getAddr(), Dest.isVolatile()); |
| 45 | } |
| 46 | |
| 47 | AggValueSlot EnsureSlot(QualType T) { |
| 48 | if (!Dest.isIgnored()) return Dest; |
| 49 | return CGF.CreateAggTemp(T, "agg.tmp.ensured"); |
John McCall | ef072fd | 2010-05-22 01:48:05 +0000 | [diff] [blame] | 50 | } |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 51 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 52 | public: |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 53 | AggExprEmitter(CodeGenFunction &cgf, AggValueSlot Dest, |
Fariborz Jahanian | 474e2fe | 2010-09-16 00:20:07 +0000 | [diff] [blame] | 54 | bool ignore) |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 55 | : CGF(cgf), Builder(CGF.Builder), Dest(Dest), |
Fariborz Jahanian | 474e2fe | 2010-09-16 00:20:07 +0000 | [diff] [blame] | 56 | IgnoreResult(ignore) { |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 57 | } |
| 58 | |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 59 | //===--------------------------------------------------------------------===// |
| 60 | // Utilities |
| 61 | //===--------------------------------------------------------------------===// |
| 62 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 63 | /// EmitAggLoadOfLValue - Given an expression with aggregate type that |
| 64 | /// represents a value lvalue, this method emits the address of the lvalue, |
| 65 | /// then loads the result into DestPtr. |
| 66 | void EmitAggLoadOfLValue(const Expr *E); |
Eli Friedman | 922696f | 2008-05-19 17:51:16 +0000 | [diff] [blame] | 67 | |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 68 | /// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. |
Mike Stump | 49d1cd5 | 2009-05-26 22:03:21 +0000 | [diff] [blame] | 69 | void EmitFinalDestCopy(const Expr *E, LValue Src, bool Ignore = false); |
| 70 | void EmitFinalDestCopy(const Expr *E, RValue Src, bool Ignore = false); |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 71 | |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 72 | void EmitGCMove(const Expr *E, RValue Src); |
| 73 | |
| 74 | bool TypeRequiresGCollection(QualType T); |
| 75 | |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 76 | //===--------------------------------------------------------------------===// |
| 77 | // Visitor Methods |
| 78 | //===--------------------------------------------------------------------===// |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 79 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 80 | void VisitStmt(Stmt *S) { |
Daniel Dunbar | 488e993 | 2008-08-16 00:56:44 +0000 | [diff] [blame] | 81 | CGF.ErrorUnsupported(S, "aggregate expression"); |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 82 | } |
| 83 | void VisitParenExpr(ParenExpr *PE) { Visit(PE->getSubExpr()); } |
Eli Friedman | 12444a2 | 2009-01-27 09:03:41 +0000 | [diff] [blame] | 84 | void VisitUnaryExtension(UnaryOperator *E) { Visit(E->getSubExpr()); } |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 85 | |
| 86 | // l-values. |
Seo Sanghyeon | 9b73b39 | 2007-12-14 02:04:12 +0000 | [diff] [blame] | 87 | void VisitDeclRefExpr(DeclRefExpr *DRE) { EmitAggLoadOfLValue(DRE); } |
| 88 | void VisitMemberExpr(MemberExpr *ME) { EmitAggLoadOfLValue(ME); } |
| 89 | void VisitUnaryDeref(UnaryOperator *E) { EmitAggLoadOfLValue(E); } |
Daniel Dunbar | 5be028f | 2010-01-04 18:47:06 +0000 | [diff] [blame] | 90 | void VisitStringLiteral(StringLiteral *E) { EmitAggLoadOfLValue(E); } |
Chris Lattner | f0a990c | 2009-04-21 23:00:09 +0000 | [diff] [blame] | 91 | void VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 92 | EmitAggLoadOfLValue(E); |
Chris Lattner | f0a990c | 2009-04-21 23:00:09 +0000 | [diff] [blame] | 93 | } |
Seo Sanghyeon | 9b73b39 | 2007-12-14 02:04:12 +0000 | [diff] [blame] | 94 | void VisitArraySubscriptExpr(ArraySubscriptExpr *E) { |
| 95 | EmitAggLoadOfLValue(E); |
| 96 | } |
Chris Lattner | f0a990c | 2009-04-21 23:00:09 +0000 | [diff] [blame] | 97 | void VisitBlockDeclRefExpr(const BlockDeclRefExpr *E) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 98 | EmitAggLoadOfLValue(E); |
Chris Lattner | f0a990c | 2009-04-21 23:00:09 +0000 | [diff] [blame] | 99 | } |
| 100 | void VisitPredefinedExpr(const PredefinedExpr *E) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 101 | EmitAggLoadOfLValue(E); |
Chris Lattner | f0a990c | 2009-04-21 23:00:09 +0000 | [diff] [blame] | 102 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 103 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 104 | // Operators. |
Anders Carlsson | 4d8673b | 2009-08-07 23:22:37 +0000 | [diff] [blame] | 105 | void VisitCastExpr(CastExpr *E); |
Anders Carlsson | 148fe67 | 2007-10-31 22:04:46 +0000 | [diff] [blame] | 106 | void VisitCallExpr(const CallExpr *E); |
Chris Lattner | b2d963f | 2007-08-31 22:54:14 +0000 | [diff] [blame] | 107 | void VisitStmtExpr(const StmtExpr *E); |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 108 | void VisitBinaryOperator(const BinaryOperator *BO); |
Fariborz Jahanian | 8bfd31f | 2009-10-22 22:57:31 +0000 | [diff] [blame] | 109 | void VisitPointerToDataMemberBinaryOperator(const BinaryOperator *BO); |
Chris Lattner | 03d6fb9 | 2007-08-21 04:43:17 +0000 | [diff] [blame] | 110 | void VisitBinAssign(const BinaryOperator *E); |
Eli Friedman | 07fa52a | 2008-05-20 07:56:31 +0000 | [diff] [blame] | 111 | void VisitBinComma(const BinaryOperator *E); |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 112 | |
Chris Lattner | 8fdf328 | 2008-06-24 17:04:18 +0000 | [diff] [blame] | 113 | void VisitObjCMessageExpr(ObjCMessageExpr *E); |
Daniel Dunbar | 0a04d77 | 2008-08-23 10:51:21 +0000 | [diff] [blame] | 114 | void VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) { |
| 115 | EmitAggLoadOfLValue(E); |
| 116 | } |
Daniel Dunbar | 9c3fc70 | 2008-08-27 06:57:25 +0000 | [diff] [blame] | 117 | void VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 118 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 119 | void VisitConditionalOperator(const ConditionalOperator *CO); |
Anders Carlsson | a294ca8 | 2009-07-08 18:33:14 +0000 | [diff] [blame] | 120 | void VisitChooseExpr(const ChooseExpr *CE); |
Devang Patel | 636c3d0 | 2007-10-26 17:44:44 +0000 | [diff] [blame] | 121 | void VisitInitListExpr(InitListExpr *E); |
Anders Carlsson | 30311fa | 2009-12-16 06:57:54 +0000 | [diff] [blame] | 122 | void VisitImplicitValueInitExpr(ImplicitValueInitExpr *E); |
Chris Lattner | 0442108 | 2008-04-08 04:40:51 +0000 | [diff] [blame] | 123 | void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) { |
| 124 | Visit(DAE->getExpr()); |
| 125 | } |
Anders Carlsson | b58d017 | 2009-05-30 23:23:33 +0000 | [diff] [blame] | 126 | void VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E); |
Anders Carlsson | 31ccf37 | 2009-05-03 17:47:16 +0000 | [diff] [blame] | 127 | void VisitCXXConstructExpr(const CXXConstructExpr *E); |
John McCall | 4765fa0 | 2010-12-06 08:20:24 +0000 | [diff] [blame] | 128 | void VisitExprWithCleanups(ExprWithCleanups *E); |
Douglas Gregor | ed8abf1 | 2010-07-08 06:14:04 +0000 | [diff] [blame] | 129 | void VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E); |
Mike Stump | 2710c41 | 2009-11-18 00:40:12 +0000 | [diff] [blame] | 130 | void VisitCXXTypeidExpr(CXXTypeidExpr *E) { EmitAggLoadOfLValue(E); } |
Anders Carlsson | 7f6ad15 | 2009-05-19 04:48:36 +0000 | [diff] [blame] | 131 | |
Eli Friedman | b185124 | 2008-05-27 15:51:49 +0000 | [diff] [blame] | 132 | void VisitVAArgExpr(VAArgExpr *E); |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 133 | |
Anders Carlsson | 78e83f8 | 2010-02-03 17:33:16 +0000 | [diff] [blame] | 134 | void EmitInitializationToLValue(Expr *E, LValue Address, QualType T); |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 135 | void EmitNullInitializationToLValue(LValue Address, QualType T); |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 136 | // case Expr::ChooseExprClass: |
Mike Stump | 39406b1 | 2009-12-09 19:24:08 +0000 | [diff] [blame] | 137 | void VisitCXXThrowExpr(const CXXThrowExpr *E) { CGF.EmitCXXThrowExpr(E); } |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 138 | }; |
| 139 | } // end anonymous namespace. |
| 140 | |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 141 | //===----------------------------------------------------------------------===// |
| 142 | // Utilities |
| 143 | //===----------------------------------------------------------------------===// |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 144 | |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 145 | /// EmitAggLoadOfLValue - Given an expression with aggregate type that |
| 146 | /// represents a value lvalue, this method emits the address of the lvalue, |
| 147 | /// then loads the result into DestPtr. |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 148 | void AggExprEmitter::EmitAggLoadOfLValue(const Expr *E) { |
| 149 | LValue LV = CGF.EmitLValue(E); |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 150 | EmitFinalDestCopy(E, LV); |
| 151 | } |
| 152 | |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 153 | /// \brief True if the given aggregate type requires special GC API calls. |
| 154 | bool AggExprEmitter::TypeRequiresGCollection(QualType T) { |
| 155 | // Only record types have members that might require garbage collection. |
| 156 | const RecordType *RecordTy = T->getAs<RecordType>(); |
| 157 | if (!RecordTy) return false; |
| 158 | |
| 159 | // Don't mess with non-trivial C++ types. |
| 160 | RecordDecl *Record = RecordTy->getDecl(); |
| 161 | if (isa<CXXRecordDecl>(Record) && |
| 162 | (!cast<CXXRecordDecl>(Record)->hasTrivialCopyConstructor() || |
| 163 | !cast<CXXRecordDecl>(Record)->hasTrivialDestructor())) |
| 164 | return false; |
| 165 | |
| 166 | // Check whether the type has an object member. |
| 167 | return Record->hasObjectMember(); |
| 168 | } |
| 169 | |
| 170 | /// \brief Perform the final move to DestPtr if RequiresGCollection is set. |
| 171 | /// |
| 172 | /// The idea is that you do something like this: |
| 173 | /// RValue Result = EmitSomething(..., getReturnValueSlot()); |
| 174 | /// EmitGCMove(E, Result); |
| 175 | /// If GC doesn't interfere, this will cause the result to be emitted |
| 176 | /// directly into the return value slot. If GC does interfere, a final |
| 177 | /// move will be performed. |
| 178 | void AggExprEmitter::EmitGCMove(const Expr *E, RValue Src) { |
John McCall | d1a5f13 | 2010-09-16 03:13:23 +0000 | [diff] [blame] | 179 | if (Dest.requiresGCollection()) { |
Fariborz Jahanian | 55bcace | 2010-06-15 22:44:06 +0000 | [diff] [blame] | 180 | std::pair<uint64_t, unsigned> TypeInfo = |
| 181 | CGF.getContext().getTypeInfo(E->getType()); |
| 182 | unsigned long size = TypeInfo.first/8; |
| 183 | const llvm::Type *SizeTy = CGF.ConvertType(CGF.getContext().getSizeType()); |
| 184 | llvm::Value *SizeVal = llvm::ConstantInt::get(SizeTy, size); |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 185 | CGF.CGM.getObjCRuntime().EmitGCMemmoveCollectable(CGF, Dest.getAddr(), |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 186 | Src.getAggregateAddr(), |
Fariborz Jahanian | 55bcace | 2010-06-15 22:44:06 +0000 | [diff] [blame] | 187 | SizeVal); |
| 188 | } |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 189 | } |
| 190 | |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 191 | /// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. |
Mike Stump | 49d1cd5 | 2009-05-26 22:03:21 +0000 | [diff] [blame] | 192 | void AggExprEmitter::EmitFinalDestCopy(const Expr *E, RValue Src, bool Ignore) { |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 193 | assert(Src.isAggregate() && "value must be aggregate value!"); |
| 194 | |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 195 | // If Dest is ignored, then we're evaluating an aggregate expression |
John McCall | a8f28da | 2010-08-25 02:50:31 +0000 | [diff] [blame] | 196 | // in a context (like an expression statement) that doesn't care |
| 197 | // about the result. C says that an lvalue-to-rvalue conversion is |
| 198 | // performed in these cases; C++ says that it is not. In either |
| 199 | // case, we don't actually need to do anything unless the value is |
| 200 | // volatile. |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 201 | if (Dest.isIgnored()) { |
John McCall | a8f28da | 2010-08-25 02:50:31 +0000 | [diff] [blame] | 202 | if (!Src.isVolatileQualified() || |
| 203 | CGF.CGM.getLangOptions().CPlusPlus || |
| 204 | (IgnoreResult && Ignore)) |
Mike Stump | 9ccb103 | 2009-05-23 22:01:27 +0000 | [diff] [blame] | 205 | return; |
Fariborz Jahanian | 8a97005 | 2010-10-22 22:05:03 +0000 | [diff] [blame] | 206 | |
Mike Stump | 49d1cd5 | 2009-05-26 22:03:21 +0000 | [diff] [blame] | 207 | // If the source is volatile, we must read from it; to do that, we need |
| 208 | // some place to put it. |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 209 | Dest = CGF.CreateAggTemp(E->getType(), "agg.tmp"); |
Mike Stump | 9ccb103 | 2009-05-23 22:01:27 +0000 | [diff] [blame] | 210 | } |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 211 | |
John McCall | d1a5f13 | 2010-09-16 03:13:23 +0000 | [diff] [blame] | 212 | if (Dest.requiresGCollection()) { |
Fariborz Jahanian | 55bcace | 2010-06-15 22:44:06 +0000 | [diff] [blame] | 213 | std::pair<uint64_t, unsigned> TypeInfo = |
| 214 | CGF.getContext().getTypeInfo(E->getType()); |
| 215 | unsigned long size = TypeInfo.first/8; |
| 216 | const llvm::Type *SizeTy = CGF.ConvertType(CGF.getContext().getSizeType()); |
| 217 | llvm::Value *SizeVal = llvm::ConstantInt::get(SizeTy, size); |
Fariborz Jahanian | 08c3213 | 2009-08-31 19:33:16 +0000 | [diff] [blame] | 218 | CGF.CGM.getObjCRuntime().EmitGCMemmoveCollectable(CGF, |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 219 | Dest.getAddr(), |
| 220 | Src.getAggregateAddr(), |
| 221 | SizeVal); |
Fariborz Jahanian | 08c3213 | 2009-08-31 19:33:16 +0000 | [diff] [blame] | 222 | return; |
| 223 | } |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 224 | // If the result of the assignment is used, copy the LHS there also. |
| 225 | // FIXME: Pass VolatileDest as well. I think we also need to merge volatile |
| 226 | // from the source as well, as we can't eliminate it if either operand |
| 227 | // is volatile, unless copy has volatile for both source and destination.. |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 228 | CGF.EmitAggregateCopy(Dest.getAddr(), Src.getAggregateAddr(), E->getType(), |
| 229 | Dest.isVolatile()|Src.isVolatileQualified()); |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 230 | } |
| 231 | |
| 232 | /// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. |
Mike Stump | 49d1cd5 | 2009-05-26 22:03:21 +0000 | [diff] [blame] | 233 | void AggExprEmitter::EmitFinalDestCopy(const Expr *E, LValue Src, bool Ignore) { |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 234 | assert(Src.isSimple() && "Can't have aggregate bitfield, vector, etc"); |
| 235 | |
| 236 | EmitFinalDestCopy(E, RValue::getAggregate(Src.getAddress(), |
Mike Stump | 49d1cd5 | 2009-05-26 22:03:21 +0000 | [diff] [blame] | 237 | Src.isVolatileQualified()), |
| 238 | Ignore); |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 239 | } |
| 240 | |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 241 | //===----------------------------------------------------------------------===// |
| 242 | // Visitor Methods |
| 243 | //===----------------------------------------------------------------------===// |
| 244 | |
Anders Carlsson | 4d8673b | 2009-08-07 23:22:37 +0000 | [diff] [blame] | 245 | void AggExprEmitter::VisitCastExpr(CastExpr *E) { |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 246 | if (Dest.isIgnored() && E->getCastKind() != CK_Dynamic) { |
Douglas Gregor | 4ce46c2 | 2010-03-07 23:24:59 +0000 | [diff] [blame] | 247 | Visit(E->getSubExpr()); |
| 248 | return; |
| 249 | } |
| 250 | |
Anders Carlsson | 3016842 | 2009-09-29 01:23:39 +0000 | [diff] [blame] | 251 | switch (E->getCastKind()) { |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 252 | case CK_Dynamic: { |
Douglas Gregor | 69cfeb1 | 2010-05-14 21:31:02 +0000 | [diff] [blame] | 253 | assert(isa<CXXDynamicCastExpr>(E) && "CK_Dynamic without a dynamic_cast?"); |
| 254 | LValue LV = CGF.EmitCheckedLValue(E->getSubExpr()); |
| 255 | // FIXME: Do we also need to handle property references here? |
| 256 | if (LV.isSimple()) |
| 257 | CGF.EmitDynamicCast(LV.getAddress(), cast<CXXDynamicCastExpr>(E)); |
| 258 | else |
| 259 | CGF.CGM.ErrorUnsupported(E, "non-simple lvalue dynamic_cast"); |
| 260 | |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 261 | if (!Dest.isIgnored()) |
| 262 | CGF.CGM.ErrorUnsupported(E, "lvalue dynamic_cast with a destination"); |
Douglas Gregor | 69cfeb1 | 2010-05-14 21:31:02 +0000 | [diff] [blame] | 263 | break; |
| 264 | } |
| 265 | |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 266 | case CK_ToUnion: { |
Anders Carlsson | 4d8673b | 2009-08-07 23:22:37 +0000 | [diff] [blame] | 267 | // GCC union extension |
Daniel Dunbar | 79c3928 | 2010-08-21 03:15:20 +0000 | [diff] [blame] | 268 | QualType Ty = E->getSubExpr()->getType(); |
| 269 | QualType PtrTy = CGF.getContext().getPointerType(Ty); |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 270 | llvm::Value *CastPtr = Builder.CreateBitCast(Dest.getAddr(), |
Eli Friedman | 34ebf4d | 2009-06-03 20:45:06 +0000 | [diff] [blame] | 271 | CGF.ConvertType(PtrTy)); |
Daniel Dunbar | 79c3928 | 2010-08-21 03:15:20 +0000 | [diff] [blame] | 272 | EmitInitializationToLValue(E->getSubExpr(), CGF.MakeAddrLValue(CastPtr, Ty), |
| 273 | Ty); |
Anders Carlsson | 3016842 | 2009-09-29 01:23:39 +0000 | [diff] [blame] | 274 | break; |
Nuno Lopes | 7e91627 | 2009-01-15 20:14:33 +0000 | [diff] [blame] | 275 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 276 | |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 277 | case CK_DerivedToBase: |
| 278 | case CK_BaseToDerived: |
| 279 | case CK_UncheckedDerivedToBase: { |
Douglas Gregor | 2d6b0e9 | 2010-05-22 05:17:18 +0000 | [diff] [blame] | 280 | assert(0 && "cannot perform hierarchy conversion in EmitAggExpr: " |
| 281 | "should have been unpacked before we got here"); |
| 282 | break; |
| 283 | } |
| 284 | |
John McCall | f6a1648 | 2010-12-04 03:47:34 +0000 | [diff] [blame] | 285 | case CK_GetObjCProperty: { |
| 286 | LValue LV = CGF.EmitLValue(E->getSubExpr()); |
| 287 | assert(LV.isPropertyRef()); |
| 288 | RValue RV = CGF.EmitLoadOfPropertyRefLValue(LV, getReturnValueSlot()); |
| 289 | EmitGCMove(E, RV); |
| 290 | break; |
| 291 | } |
| 292 | |
| 293 | case CK_LValueToRValue: // hope for downstream optimization |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 294 | case CK_NoOp: |
| 295 | case CK_UserDefinedConversion: |
| 296 | case CK_ConstructorConversion: |
Anders Carlsson | 3016842 | 2009-09-29 01:23:39 +0000 | [diff] [blame] | 297 | assert(CGF.getContext().hasSameUnqualifiedType(E->getSubExpr()->getType(), |
| 298 | E->getType()) && |
| 299 | "Implicit cast types must be compatible"); |
| 300 | Visit(E->getSubExpr()); |
| 301 | break; |
John McCall | 0ae287a | 2010-12-01 04:43:34 +0000 | [diff] [blame] | 302 | |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 303 | case CK_LValueBitCast: |
John McCall | 0ae287a | 2010-12-01 04:43:34 +0000 | [diff] [blame] | 304 | llvm_unreachable("should not be emitting lvalue bitcast as rvalue"); |
Douglas Gregor | e39a389 | 2010-07-13 23:17:26 +0000 | [diff] [blame] | 305 | break; |
John McCall | 0ae287a | 2010-12-01 04:43:34 +0000 | [diff] [blame] | 306 | |
| 307 | case CK_Dependent: |
| 308 | case CK_BitCast: |
| 309 | case CK_ArrayToPointerDecay: |
| 310 | case CK_FunctionToPointerDecay: |
| 311 | case CK_NullToPointer: |
| 312 | case CK_NullToMemberPointer: |
| 313 | case CK_BaseToDerivedMemberPointer: |
| 314 | case CK_DerivedToBaseMemberPointer: |
| 315 | case CK_MemberPointerToBoolean: |
| 316 | case CK_IntegralToPointer: |
| 317 | case CK_PointerToIntegral: |
| 318 | case CK_PointerToBoolean: |
| 319 | case CK_ToVoid: |
| 320 | case CK_VectorSplat: |
| 321 | case CK_IntegralCast: |
| 322 | case CK_IntegralToBoolean: |
| 323 | case CK_IntegralToFloating: |
| 324 | case CK_FloatingToIntegral: |
| 325 | case CK_FloatingToBoolean: |
| 326 | case CK_FloatingCast: |
| 327 | case CK_AnyPointerToObjCPointerCast: |
| 328 | case CK_AnyPointerToBlockPointerCast: |
| 329 | case CK_ObjCObjectLValueCast: |
| 330 | case CK_FloatingRealToComplex: |
| 331 | case CK_FloatingComplexToReal: |
| 332 | case CK_FloatingComplexToBoolean: |
| 333 | case CK_FloatingComplexCast: |
| 334 | case CK_FloatingComplexToIntegralComplex: |
| 335 | case CK_IntegralRealToComplex: |
| 336 | case CK_IntegralComplexToReal: |
| 337 | case CK_IntegralComplexToBoolean: |
| 338 | case CK_IntegralComplexCast: |
| 339 | case CK_IntegralComplexToFloatingComplex: |
| 340 | llvm_unreachable("cast kind invalid for aggregate types"); |
Anders Carlsson | 3016842 | 2009-09-29 01:23:39 +0000 | [diff] [blame] | 341 | } |
Anders Carlsson | e4707ff | 2008-01-14 06:28:57 +0000 | [diff] [blame] | 342 | } |
| 343 | |
Chris Lattner | 9619662 | 2008-07-26 22:37:01 +0000 | [diff] [blame] | 344 | void AggExprEmitter::VisitCallExpr(const CallExpr *E) { |
Anders Carlsson | e70e8f7 | 2009-05-27 16:45:02 +0000 | [diff] [blame] | 345 | if (E->getCallReturnType()->isReferenceType()) { |
| 346 | EmitAggLoadOfLValue(E); |
| 347 | return; |
| 348 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 349 | |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 350 | RValue RV = CGF.EmitCallExpr(E, getReturnValueSlot()); |
| 351 | EmitGCMove(E, RV); |
Anders Carlsson | 148fe67 | 2007-10-31 22:04:46 +0000 | [diff] [blame] | 352 | } |
Chris Lattner | 9619662 | 2008-07-26 22:37:01 +0000 | [diff] [blame] | 353 | |
| 354 | void AggExprEmitter::VisitObjCMessageExpr(ObjCMessageExpr *E) { |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 355 | RValue RV = CGF.EmitObjCMessageExpr(E, getReturnValueSlot()); |
| 356 | EmitGCMove(E, RV); |
Chris Lattner | 8fdf328 | 2008-06-24 17:04:18 +0000 | [diff] [blame] | 357 | } |
Anders Carlsson | 148fe67 | 2007-10-31 22:04:46 +0000 | [diff] [blame] | 358 | |
Daniel Dunbar | 9c3fc70 | 2008-08-27 06:57:25 +0000 | [diff] [blame] | 359 | void AggExprEmitter::VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E) { |
John McCall | f6a1648 | 2010-12-04 03:47:34 +0000 | [diff] [blame] | 360 | llvm_unreachable("direct property access not surrounded by " |
| 361 | "lvalue-to-rvalue cast"); |
Daniel Dunbar | 9c3fc70 | 2008-08-27 06:57:25 +0000 | [diff] [blame] | 362 | } |
| 363 | |
Chris Lattner | 9619662 | 2008-07-26 22:37:01 +0000 | [diff] [blame] | 364 | void AggExprEmitter::VisitBinComma(const BinaryOperator *E) { |
John McCall | 2a41637 | 2010-12-05 02:00:02 +0000 | [diff] [blame] | 365 | CGF.EmitIgnoredExpr(E->getLHS()); |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 366 | Visit(E->getRHS()); |
Eli Friedman | 07fa52a | 2008-05-20 07:56:31 +0000 | [diff] [blame] | 367 | } |
| 368 | |
Chris Lattner | b2d963f | 2007-08-31 22:54:14 +0000 | [diff] [blame] | 369 | void AggExprEmitter::VisitStmtExpr(const StmtExpr *E) { |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 370 | CodeGenFunction::StmtExprEvaluation eval(CGF); |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 371 | CGF.EmitCompoundStmt(*E->getSubStmt(), true, Dest); |
Chris Lattner | b2d963f | 2007-08-31 22:54:14 +0000 | [diff] [blame] | 372 | } |
| 373 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 374 | void AggExprEmitter::VisitBinaryOperator(const BinaryOperator *E) { |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 375 | if (E->getOpcode() == BO_PtrMemD || E->getOpcode() == BO_PtrMemI) |
Fariborz Jahanian | 8bfd31f | 2009-10-22 22:57:31 +0000 | [diff] [blame] | 376 | VisitPointerToDataMemberBinaryOperator(E); |
| 377 | else |
| 378 | CGF.ErrorUnsupported(E, "aggregate binary expression"); |
| 379 | } |
| 380 | |
| 381 | void AggExprEmitter::VisitPointerToDataMemberBinaryOperator( |
| 382 | const BinaryOperator *E) { |
| 383 | LValue LV = CGF.EmitPointerToDataMemberBinaryExpr(E); |
| 384 | EmitFinalDestCopy(E, LV); |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 385 | } |
| 386 | |
Chris Lattner | 03d6fb9 | 2007-08-21 04:43:17 +0000 | [diff] [blame] | 387 | void AggExprEmitter::VisitBinAssign(const BinaryOperator *E) { |
Eli Friedman | ff6e2b7 | 2008-02-11 01:09:17 +0000 | [diff] [blame] | 388 | // For an assignment to work, the value on the right has |
| 389 | // to be compatible with the value on the left. |
Eli Friedman | 2dce5f8 | 2009-05-28 23:04:00 +0000 | [diff] [blame] | 390 | assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(), |
| 391 | E->getRHS()->getType()) |
Eli Friedman | ff6e2b7 | 2008-02-11 01:09:17 +0000 | [diff] [blame] | 392 | && "Invalid assignment"); |
John McCall | cd940a1 | 2010-12-06 06:10:02 +0000 | [diff] [blame] | 393 | |
| 394 | // FIXME: __block variables need the RHS evaluated first! |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 395 | LValue LHS = CGF.EmitLValue(E->getLHS()); |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 396 | |
Daniel Dunbar | 7f8ea5c | 2008-08-30 05:35:15 +0000 | [diff] [blame] | 397 | // We have to special case property setters, otherwise we must have |
| 398 | // a simple lvalue (no aggregates inside vectors, bitfields). |
| 399 | if (LHS.isPropertyRef()) { |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 400 | AggValueSlot Slot = EnsureSlot(E->getRHS()->getType()); |
| 401 | CGF.EmitAggExpr(E->getRHS(), Slot); |
John McCall | 119a1c6 | 2010-12-04 02:32:38 +0000 | [diff] [blame] | 402 | CGF.EmitStoreThroughPropertyRefLValue(Slot.asRValue(), LHS); |
Daniel Dunbar | 7f8ea5c | 2008-08-30 05:35:15 +0000 | [diff] [blame] | 403 | } else { |
Fariborz Jahanian | 474e2fe | 2010-09-16 00:20:07 +0000 | [diff] [blame] | 404 | bool GCollection = false; |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 405 | if (CGF.getContext().getLangOptions().getGCMode()) |
Fariborz Jahanian | 474e2fe | 2010-09-16 00:20:07 +0000 | [diff] [blame] | 406 | GCollection = TypeRequiresGCollection(E->getLHS()->getType()); |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 407 | |
Daniel Dunbar | 7f8ea5c | 2008-08-30 05:35:15 +0000 | [diff] [blame] | 408 | // Codegen the RHS so that it stores directly into the LHS. |
Fariborz Jahanian | 474e2fe | 2010-09-16 00:20:07 +0000 | [diff] [blame] | 409 | AggValueSlot LHSSlot = AggValueSlot::forLValue(LHS, true, |
| 410 | GCollection); |
| 411 | CGF.EmitAggExpr(E->getRHS(), LHSSlot, false); |
Mike Stump | 49d1cd5 | 2009-05-26 22:03:21 +0000 | [diff] [blame] | 412 | EmitFinalDestCopy(E, LHS, true); |
Daniel Dunbar | 7f8ea5c | 2008-08-30 05:35:15 +0000 | [diff] [blame] | 413 | } |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 414 | } |
| 415 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 416 | void AggExprEmitter::VisitConditionalOperator(const ConditionalOperator *E) { |
Eli Friedman | 8e274bd | 2009-12-25 06:17:05 +0000 | [diff] [blame] | 417 | if (!E->getLHS()) { |
| 418 | CGF.ErrorUnsupported(E, "conditional operator with missing LHS"); |
| 419 | return; |
| 420 | } |
| 421 | |
Daniel Dunbar | 9615ecb | 2008-11-13 01:38:36 +0000 | [diff] [blame] | 422 | llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true"); |
| 423 | llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false"); |
| 424 | llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 425 | |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 426 | CodeGenFunction::ConditionalEvaluation eval(CGF); |
Eli Friedman | 8e274bd | 2009-12-25 06:17:05 +0000 | [diff] [blame] | 427 | CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 428 | |
John McCall | 74fb0ed | 2010-11-17 00:07:33 +0000 | [diff] [blame] | 429 | // Save whether the destination's lifetime is externally managed. |
| 430 | bool DestLifetimeManaged = Dest.isLifetimeExternallyManaged(); |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 431 | |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 432 | eval.begin(CGF); |
| 433 | CGF.EmitBlock(LHSBlock); |
Chris Lattner | c748f27 | 2007-08-21 05:02:10 +0000 | [diff] [blame] | 434 | Visit(E->getLHS()); |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 435 | eval.end(CGF); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 436 | |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 437 | assert(CGF.HaveInsertPoint() && "expression evaluation ended with no IP!"); |
| 438 | CGF.Builder.CreateBr(ContBlock); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 439 | |
John McCall | 74fb0ed | 2010-11-17 00:07:33 +0000 | [diff] [blame] | 440 | // If the result of an agg expression is unused, then the emission |
| 441 | // of the LHS might need to create a destination slot. That's fine |
| 442 | // with us, and we can safely emit the RHS into the same slot, but |
| 443 | // we shouldn't claim that its lifetime is externally managed. |
| 444 | Dest.setLifetimeExternallyManaged(DestLifetimeManaged); |
| 445 | |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 446 | eval.begin(CGF); |
| 447 | CGF.EmitBlock(RHSBlock); |
Chris Lattner | c748f27 | 2007-08-21 05:02:10 +0000 | [diff] [blame] | 448 | Visit(E->getRHS()); |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 449 | eval.end(CGF); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 450 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 451 | CGF.EmitBlock(ContBlock); |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 452 | } |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 453 | |
Anders Carlsson | a294ca8 | 2009-07-08 18:33:14 +0000 | [diff] [blame] | 454 | void AggExprEmitter::VisitChooseExpr(const ChooseExpr *CE) { |
| 455 | Visit(CE->getChosenSubExpr(CGF.getContext())); |
| 456 | } |
| 457 | |
Eli Friedman | b185124 | 2008-05-27 15:51:49 +0000 | [diff] [blame] | 458 | void AggExprEmitter::VisitVAArgExpr(VAArgExpr *VE) { |
Daniel Dunbar | 0785570 | 2009-02-11 22:25:55 +0000 | [diff] [blame] | 459 | llvm::Value *ArgValue = CGF.EmitVAListRef(VE->getSubExpr()); |
Anders Carlsson | ddf7cac | 2008-11-04 05:30:00 +0000 | [diff] [blame] | 460 | llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, VE->getType()); |
| 461 | |
Sebastian Redl | 0262f02 | 2009-01-09 21:09:38 +0000 | [diff] [blame] | 462 | if (!ArgPtr) { |
Anders Carlsson | ddf7cac | 2008-11-04 05:30:00 +0000 | [diff] [blame] | 463 | CGF.ErrorUnsupported(VE, "aggregate va_arg expression"); |
Sebastian Redl | 0262f02 | 2009-01-09 21:09:38 +0000 | [diff] [blame] | 464 | return; |
| 465 | } |
| 466 | |
Daniel Dunbar | 79c3928 | 2010-08-21 03:15:20 +0000 | [diff] [blame] | 467 | EmitFinalDestCopy(VE, CGF.MakeAddrLValue(ArgPtr, VE->getType())); |
Eli Friedman | b185124 | 2008-05-27 15:51:49 +0000 | [diff] [blame] | 468 | } |
| 469 | |
Anders Carlsson | b58d017 | 2009-05-30 23:23:33 +0000 | [diff] [blame] | 470 | void AggExprEmitter::VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) { |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 471 | // Ensure that we have a slot, but if we already do, remember |
| 472 | // whether its lifetime was externally managed. |
| 473 | bool WasManaged = Dest.isLifetimeExternallyManaged(); |
| 474 | Dest = EnsureSlot(E->getType()); |
| 475 | Dest.setLifetimeExternallyManaged(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 476 | |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 477 | Visit(E->getSubExpr()); |
Anders Carlsson | b58d017 | 2009-05-30 23:23:33 +0000 | [diff] [blame] | 478 | |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 479 | // Set up the temporary's destructor if its lifetime wasn't already |
| 480 | // being managed. |
| 481 | if (!WasManaged) |
| 482 | CGF.EmitCXXTemporary(E->getTemporary(), Dest.getAddr()); |
Anders Carlsson | b58d017 | 2009-05-30 23:23:33 +0000 | [diff] [blame] | 483 | } |
| 484 | |
Anders Carlsson | b14095a | 2009-04-17 00:06:03 +0000 | [diff] [blame] | 485 | void |
Anders Carlsson | 31ccf37 | 2009-05-03 17:47:16 +0000 | [diff] [blame] | 486 | AggExprEmitter::VisitCXXConstructExpr(const CXXConstructExpr *E) { |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 487 | AggValueSlot Slot = EnsureSlot(E->getType()); |
| 488 | CGF.EmitCXXConstructExpr(E, Slot); |
Anders Carlsson | 7f6ad15 | 2009-05-19 04:48:36 +0000 | [diff] [blame] | 489 | } |
| 490 | |
John McCall | 4765fa0 | 2010-12-06 08:20:24 +0000 | [diff] [blame] | 491 | void AggExprEmitter::VisitExprWithCleanups(ExprWithCleanups *E) { |
| 492 | CGF.EmitExprWithCleanups(E, Dest); |
Anders Carlsson | b14095a | 2009-04-17 00:06:03 +0000 | [diff] [blame] | 493 | } |
| 494 | |
Douglas Gregor | ed8abf1 | 2010-07-08 06:14:04 +0000 | [diff] [blame] | 495 | void AggExprEmitter::VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E) { |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 496 | QualType T = E->getType(); |
| 497 | AggValueSlot Slot = EnsureSlot(T); |
| 498 | EmitNullInitializationToLValue(CGF.MakeAddrLValue(Slot.getAddr(), T), T); |
Anders Carlsson | 30311fa | 2009-12-16 06:57:54 +0000 | [diff] [blame] | 499 | } |
| 500 | |
| 501 | void AggExprEmitter::VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) { |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 502 | QualType T = E->getType(); |
| 503 | AggValueSlot Slot = EnsureSlot(T); |
| 504 | EmitNullInitializationToLValue(CGF.MakeAddrLValue(Slot.getAddr(), T), T); |
Nuno Lopes | 329763b | 2009-10-18 15:18:11 +0000 | [diff] [blame] | 505 | } |
| 506 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 507 | /// isSimpleZero - If emitting this value will obviously just cause a store of |
| 508 | /// zero to memory, return true. This can return false if uncertain, so it just |
| 509 | /// handles simple cases. |
| 510 | static bool isSimpleZero(const Expr *E, CodeGenFunction &CGF) { |
| 511 | // (0) |
| 512 | if (const ParenExpr *PE = dyn_cast<ParenExpr>(E)) |
| 513 | return isSimpleZero(PE->getSubExpr(), CGF); |
| 514 | // 0 |
| 515 | if (const IntegerLiteral *IL = dyn_cast<IntegerLiteral>(E)) |
| 516 | return IL->getValue() == 0; |
| 517 | // +0.0 |
| 518 | if (const FloatingLiteral *FL = dyn_cast<FloatingLiteral>(E)) |
| 519 | return FL->getValue().isPosZero(); |
| 520 | // int() |
| 521 | if ((isa<ImplicitValueInitExpr>(E) || isa<CXXScalarValueInitExpr>(E)) && |
| 522 | CGF.getTypes().isZeroInitializable(E->getType())) |
| 523 | return true; |
| 524 | // (int*)0 - Null pointer expressions. |
| 525 | if (const CastExpr *ICE = dyn_cast<CastExpr>(E)) |
| 526 | return ICE->getCastKind() == CK_NullToPointer; |
| 527 | // '\0' |
| 528 | if (const CharacterLiteral *CL = dyn_cast<CharacterLiteral>(E)) |
| 529 | return CL->getValue() == 0; |
| 530 | |
| 531 | // Otherwise, hard case: conservatively return false. |
| 532 | return false; |
| 533 | } |
| 534 | |
| 535 | |
Anders Carlsson | 78e83f8 | 2010-02-03 17:33:16 +0000 | [diff] [blame] | 536 | void |
| 537 | AggExprEmitter::EmitInitializationToLValue(Expr* E, LValue LV, QualType T) { |
Mike Stump | 7f79f9b | 2009-05-29 15:46:01 +0000 | [diff] [blame] | 538 | // FIXME: Ignore result? |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 539 | // FIXME: Are initializers affected by volatile? |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 540 | if (Dest.isZeroed() && isSimpleZero(E, CGF)) { |
| 541 | // Storing "i32 0" to a zero'd memory location is a noop. |
| 542 | } else if (isa<ImplicitValueInitExpr>(E)) { |
Anders Carlsson | 78e83f8 | 2010-02-03 17:33:16 +0000 | [diff] [blame] | 543 | EmitNullInitializationToLValue(LV, T); |
Anders Carlsson | e78ccb4 | 2010-02-03 19:13:55 +0000 | [diff] [blame] | 544 | } else if (T->isReferenceType()) { |
Anders Carlsson | 32f36ba | 2010-06-26 16:35:32 +0000 | [diff] [blame] | 545 | RValue RV = CGF.EmitReferenceBindingToExpr(E, /*InitializedDecl=*/0); |
Anders Carlsson | e78ccb4 | 2010-02-03 19:13:55 +0000 | [diff] [blame] | 546 | CGF.EmitStoreThroughLValue(RV, LV, T); |
Anders Carlsson | 78e83f8 | 2010-02-03 17:33:16 +0000 | [diff] [blame] | 547 | } else if (T->isAnyComplexType()) { |
Douglas Gregor | 3498bdb | 2009-01-29 17:44:32 +0000 | [diff] [blame] | 548 | CGF.EmitComplexExprIntoAddr(E, LV.getAddress(), false); |
Anders Carlsson | 78e83f8 | 2010-02-03 17:33:16 +0000 | [diff] [blame] | 549 | } else if (CGF.hasAggregateLLVMType(T)) { |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 550 | CGF.EmitAggExpr(E, AggValueSlot::forAddr(LV.getAddress(), false, true, |
| 551 | false, Dest.isZeroed())); |
Eli Friedman | c8ba961 | 2008-05-12 15:06:05 +0000 | [diff] [blame] | 552 | } else { |
John McCall | 2a41637 | 2010-12-05 02:00:02 +0000 | [diff] [blame] | 553 | CGF.EmitStoreThroughLValue(RValue::get(CGF.EmitScalarExpr(E)), LV, T); |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 554 | } |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 555 | } |
| 556 | |
| 557 | void AggExprEmitter::EmitNullInitializationToLValue(LValue LV, QualType T) { |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 558 | // If the destination slot is already zeroed out before the aggregate is |
| 559 | // copied into it, we don't have to emit any zeros here. |
| 560 | if (Dest.isZeroed() && CGF.getTypes().isZeroInitializable(T)) |
| 561 | return; |
| 562 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 563 | if (!CGF.hasAggregateLLVMType(T)) { |
| 564 | // For non-aggregates, we can store zero |
Owen Anderson | c9c88b4 | 2009-07-31 20:28:54 +0000 | [diff] [blame] | 565 | llvm::Value *Null = llvm::Constant::getNullValue(CGF.ConvertType(T)); |
Daniel Dunbar | 8239713 | 2008-08-06 05:32:55 +0000 | [diff] [blame] | 566 | CGF.EmitStoreThroughLValue(RValue::get(Null), LV, T); |
Lauro Ramos Venancio | 145cd89 | 2008-02-19 19:27:31 +0000 | [diff] [blame] | 567 | } else { |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 568 | // There's a potential optimization opportunity in combining |
| 569 | // memsets; that would be easy for arrays, but relatively |
| 570 | // difficult for structures with the current code. |
Anders Carlsson | 1884eb0 | 2010-05-22 17:35:42 +0000 | [diff] [blame] | 571 | CGF.EmitNullInitialization(LV.getAddress(), T); |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 572 | } |
| 573 | } |
| 574 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 575 | void AggExprEmitter::VisitInitListExpr(InitListExpr *E) { |
Eli Friedman | a385b3c | 2008-12-02 01:17:45 +0000 | [diff] [blame] | 576 | #if 0 |
Eli Friedman | 13a5be1 | 2009-12-04 01:30:56 +0000 | [diff] [blame] | 577 | // FIXME: Assess perf here? Figure out what cases are worth optimizing here |
| 578 | // (Length of globals? Chunks of zeroed-out space?). |
Eli Friedman | a385b3c | 2008-12-02 01:17:45 +0000 | [diff] [blame] | 579 | // |
Mike Stump | f5408fe | 2009-05-16 07:57:57 +0000 | [diff] [blame] | 580 | // If we can, prefer a copy from a global; this is a lot less code for long |
| 581 | // globals, and it's easier for the current optimizers to analyze. |
Eli Friedman | 13a5be1 | 2009-12-04 01:30:56 +0000 | [diff] [blame] | 582 | if (llvm::Constant* C = CGF.CGM.EmitConstantExpr(E, E->getType(), &CGF)) { |
Eli Friedman | 994ffef | 2008-11-30 02:11:09 +0000 | [diff] [blame] | 583 | llvm::GlobalVariable* GV = |
Eli Friedman | 13a5be1 | 2009-12-04 01:30:56 +0000 | [diff] [blame] | 584 | new llvm::GlobalVariable(CGF.CGM.getModule(), C->getType(), true, |
| 585 | llvm::GlobalValue::InternalLinkage, C, ""); |
Daniel Dunbar | 79c3928 | 2010-08-21 03:15:20 +0000 | [diff] [blame] | 586 | EmitFinalDestCopy(E, CGF.MakeAddrLValue(GV, E->getType())); |
Eli Friedman | 994ffef | 2008-11-30 02:11:09 +0000 | [diff] [blame] | 587 | return; |
| 588 | } |
Eli Friedman | a385b3c | 2008-12-02 01:17:45 +0000 | [diff] [blame] | 589 | #endif |
Chris Lattner | d0db03a | 2010-09-06 00:11:41 +0000 | [diff] [blame] | 590 | if (E->hadArrayRangeDesignator()) |
Douglas Gregor | a9c8780 | 2009-01-29 19:42:23 +0000 | [diff] [blame] | 591 | CGF.ErrorUnsupported(E, "GNU array range designator extension"); |
Douglas Gregor | a9c8780 | 2009-01-29 19:42:23 +0000 | [diff] [blame] | 592 | |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 593 | llvm::Value *DestPtr = Dest.getAddr(); |
| 594 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 595 | // Handle initialization of an array. |
| 596 | if (E->getType()->isArrayType()) { |
| 597 | const llvm::PointerType *APType = |
| 598 | cast<llvm::PointerType>(DestPtr->getType()); |
| 599 | const llvm::ArrayType *AType = |
| 600 | cast<llvm::ArrayType>(APType->getElementType()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 601 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 602 | uint64_t NumInitElements = E->getNumInits(); |
Eli Friedman | 922696f | 2008-05-19 17:51:16 +0000 | [diff] [blame] | 603 | |
Chris Lattner | 9619662 | 2008-07-26 22:37:01 +0000 | [diff] [blame] | 604 | if (E->getNumInits() > 0) { |
| 605 | QualType T1 = E->getType(); |
| 606 | QualType T2 = E->getInit(0)->getType(); |
Eli Friedman | 2dce5f8 | 2009-05-28 23:04:00 +0000 | [diff] [blame] | 607 | if (CGF.getContext().hasSameUnqualifiedType(T1, T2)) { |
Chris Lattner | 9619662 | 2008-07-26 22:37:01 +0000 | [diff] [blame] | 608 | EmitAggLoadOfLValue(E->getInit(0)); |
| 609 | return; |
| 610 | } |
Eli Friedman | 922696f | 2008-05-19 17:51:16 +0000 | [diff] [blame] | 611 | } |
| 612 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 613 | uint64_t NumArrayElements = AType->getNumElements(); |
Chris Lattner | c63a1f2 | 2008-08-04 07:31:14 +0000 | [diff] [blame] | 614 | QualType ElementType = CGF.getContext().getCanonicalType(E->getType()); |
Douglas Gregor | 4c67834 | 2009-01-28 21:54:33 +0000 | [diff] [blame] | 615 | ElementType = CGF.getContext().getAsArrayType(ElementType)->getElementType(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 616 | |
John McCall | 0953e76 | 2009-09-24 19:53:00 +0000 | [diff] [blame] | 617 | // FIXME: were we intentionally ignoring address spaces and GC attributes? |
Eli Friedman | 1e692ac | 2008-06-13 23:01:12 +0000 | [diff] [blame] | 618 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 619 | for (uint64_t i = 0; i != NumArrayElements; ++i) { |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 620 | // If we're done emitting initializers and the destination is known-zeroed |
| 621 | // then we're done. |
| 622 | if (i == NumInitElements && |
| 623 | Dest.isZeroed() && |
| 624 | CGF.getTypes().isZeroInitializable(ElementType)) |
| 625 | break; |
| 626 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 627 | llvm::Value *NextVal = Builder.CreateStructGEP(DestPtr, i, ".array"); |
Daniel Dunbar | 9f553f5 | 2010-08-21 03:08:16 +0000 | [diff] [blame] | 628 | LValue LV = CGF.MakeAddrLValue(NextVal, ElementType); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 629 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 630 | if (i < NumInitElements) |
Daniel Dunbar | 9f553f5 | 2010-08-21 03:08:16 +0000 | [diff] [blame] | 631 | EmitInitializationToLValue(E->getInit(i), LV, ElementType); |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 632 | else |
Daniel Dunbar | 9f553f5 | 2010-08-21 03:08:16 +0000 | [diff] [blame] | 633 | EmitNullInitializationToLValue(LV, ElementType); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 634 | |
| 635 | // If the GEP didn't get used because of a dead zero init or something |
| 636 | // else, clean it up for -O0 builds and general tidiness. |
| 637 | if (llvm::GetElementPtrInst *GEP = |
| 638 | dyn_cast<llvm::GetElementPtrInst>(NextVal)) |
| 639 | if (GEP->use_empty()) |
| 640 | GEP->eraseFromParent(); |
Lauro Ramos Venancio | 145cd89 | 2008-02-19 19:27:31 +0000 | [diff] [blame] | 641 | } |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 642 | return; |
| 643 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 644 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 645 | assert(E->getType()->isRecordType() && "Only support structs/unions here!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 646 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 647 | // Do struct initialization; this code just sets each individual member |
| 648 | // to the approprate value. This makes bitfield support automatic; |
| 649 | // the disadvantage is that the generated code is more difficult for |
| 650 | // the optimizer, especially with bitfields. |
| 651 | unsigned NumInitElements = E->getNumInits(); |
Ted Kremenek | 6217b80 | 2009-07-29 21:53:49 +0000 | [diff] [blame] | 652 | RecordDecl *SD = E->getType()->getAs<RecordType>()->getDecl(); |
Chris Lattner | bd7de38 | 2010-09-06 00:13:11 +0000 | [diff] [blame] | 653 | |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 654 | if (E->getType()->isUnionType()) { |
| 655 | // Only initialize one field of a union. The field itself is |
| 656 | // specified by the initializer list. |
| 657 | if (!E->getInitializedFieldInUnion()) { |
| 658 | // Empty union; we have nothing to do. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 659 | |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 660 | #ifndef NDEBUG |
| 661 | // Make sure that it's really an empty and not a failure of |
| 662 | // semantic analysis. |
Argyrios Kyrtzidis | 17945a0 | 2009-06-30 02:36:12 +0000 | [diff] [blame] | 663 | for (RecordDecl::field_iterator Field = SD->field_begin(), |
| 664 | FieldEnd = SD->field_end(); |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 665 | Field != FieldEnd; ++Field) |
| 666 | assert(Field->isUnnamedBitfield() && "Only unnamed bitfields allowed"); |
| 667 | #endif |
| 668 | return; |
| 669 | } |
| 670 | |
| 671 | // FIXME: volatility |
| 672 | FieldDecl *Field = E->getInitializedFieldInUnion(); |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 673 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 674 | LValue FieldLoc = CGF.EmitLValueForFieldInitialization(DestPtr, Field, 0); |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 675 | if (NumInitElements) { |
| 676 | // Store the initializer into the field |
Anders Carlsson | 78e83f8 | 2010-02-03 17:33:16 +0000 | [diff] [blame] | 677 | EmitInitializationToLValue(E->getInit(0), FieldLoc, Field->getType()); |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 678 | } else { |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 679 | // Default-initialize to null. |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 680 | EmitNullInitializationToLValue(FieldLoc, Field->getType()); |
| 681 | } |
| 682 | |
| 683 | return; |
| 684 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 685 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 686 | // Here we iterate over the fields; this makes it simpler to both |
| 687 | // default-initialize fields and skip over unnamed fields. |
Chris Lattner | bd7de38 | 2010-09-06 00:13:11 +0000 | [diff] [blame] | 688 | unsigned CurInitVal = 0; |
Argyrios Kyrtzidis | 17945a0 | 2009-06-30 02:36:12 +0000 | [diff] [blame] | 689 | for (RecordDecl::field_iterator Field = SD->field_begin(), |
| 690 | FieldEnd = SD->field_end(); |
Douglas Gregor | 44b4321 | 2008-12-11 16:49:14 +0000 | [diff] [blame] | 691 | Field != FieldEnd; ++Field) { |
| 692 | // We're done once we hit the flexible array member |
| 693 | if (Field->getType()->isIncompleteArrayType()) |
| 694 | break; |
| 695 | |
Douglas Gregor | 34e7946 | 2009-01-28 23:36:17 +0000 | [diff] [blame] | 696 | if (Field->isUnnamedBitfield()) |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 697 | continue; |
Douglas Gregor | 34e7946 | 2009-01-28 23:36:17 +0000 | [diff] [blame] | 698 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 699 | // Don't emit GEP before a noop store of zero. |
| 700 | if (CurInitVal == NumInitElements && Dest.isZeroed() && |
| 701 | CGF.getTypes().isZeroInitializable(E->getType())) |
| 702 | break; |
| 703 | |
Eli Friedman | 1e692ac | 2008-06-13 23:01:12 +0000 | [diff] [blame] | 704 | // FIXME: volatility |
Anders Carlsson | e78ccb4 | 2010-02-03 19:13:55 +0000 | [diff] [blame] | 705 | LValue FieldLoc = CGF.EmitLValueForFieldInitialization(DestPtr, *Field, 0); |
Fariborz Jahanian | 14674ff | 2009-05-27 19:54:11 +0000 | [diff] [blame] | 706 | // We never generate write-barries for initialized fields. |
Daniel Dunbar | ea61917 | 2010-08-21 03:22:38 +0000 | [diff] [blame] | 707 | FieldLoc.setNonGC(true); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 708 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 709 | if (CurInitVal < NumInitElements) { |
Chris Lattner | b35baae | 2010-03-08 21:08:07 +0000 | [diff] [blame] | 710 | // Store the initializer into the field. |
| 711 | EmitInitializationToLValue(E->getInit(CurInitVal++), FieldLoc, |
Anders Carlsson | 78e83f8 | 2010-02-03 17:33:16 +0000 | [diff] [blame] | 712 | Field->getType()); |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 713 | } else { |
| 714 | // We're out of initalizers; default-initialize to null |
Douglas Gregor | 44b4321 | 2008-12-11 16:49:14 +0000 | [diff] [blame] | 715 | EmitNullInitializationToLValue(FieldLoc, Field->getType()); |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 716 | } |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 717 | |
| 718 | // If the GEP didn't get used because of a dead zero init or something |
| 719 | // else, clean it up for -O0 builds and general tidiness. |
| 720 | if (FieldLoc.isSimple()) |
| 721 | if (llvm::GetElementPtrInst *GEP = |
| 722 | dyn_cast<llvm::GetElementPtrInst>(FieldLoc.getAddress())) |
| 723 | if (GEP->use_empty()) |
| 724 | GEP->eraseFromParent(); |
Lauro Ramos Venancio | 145cd89 | 2008-02-19 19:27:31 +0000 | [diff] [blame] | 725 | } |
Devang Patel | 636c3d0 | 2007-10-26 17:44:44 +0000 | [diff] [blame] | 726 | } |
| 727 | |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 728 | //===----------------------------------------------------------------------===// |
| 729 | // Entry Points into this File |
| 730 | //===----------------------------------------------------------------------===// |
| 731 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 732 | /// GetNumNonZeroBytesInInit - Get an approximate count of the number of |
| 733 | /// non-zero bytes that will be stored when outputting the initializer for the |
| 734 | /// specified initializer expression. |
| 735 | static uint64_t GetNumNonZeroBytesInInit(const Expr *E, CodeGenFunction &CGF) { |
| 736 | if (const ParenExpr *PE = dyn_cast<ParenExpr>(E)) |
| 737 | return GetNumNonZeroBytesInInit(PE->getSubExpr(), CGF); |
| 738 | |
| 739 | // 0 and 0.0 won't require any non-zero stores! |
| 740 | if (isSimpleZero(E, CGF)) return 0; |
| 741 | |
| 742 | // If this is an initlist expr, sum up the size of sizes of the (present) |
| 743 | // elements. If this is something weird, assume the whole thing is non-zero. |
| 744 | const InitListExpr *ILE = dyn_cast<InitListExpr>(E); |
| 745 | if (ILE == 0 || !CGF.getTypes().isZeroInitializable(ILE->getType())) |
| 746 | return CGF.getContext().getTypeSize(E->getType())/8; |
| 747 | |
Chris Lattner | d1d56df | 2010-12-02 18:29:00 +0000 | [diff] [blame] | 748 | // InitListExprs for structs have to be handled carefully. If there are |
| 749 | // reference members, we need to consider the size of the reference, not the |
| 750 | // referencee. InitListExprs for unions and arrays can't have references. |
Chris Lattner | 8c00ad1 | 2010-12-02 22:52:04 +0000 | [diff] [blame] | 751 | if (const RecordType *RT = E->getType()->getAs<RecordType>()) { |
| 752 | if (!RT->isUnionType()) { |
| 753 | RecordDecl *SD = E->getType()->getAs<RecordType>()->getDecl(); |
| 754 | uint64_t NumNonZeroBytes = 0; |
| 755 | |
| 756 | unsigned ILEElement = 0; |
| 757 | for (RecordDecl::field_iterator Field = SD->field_begin(), |
| 758 | FieldEnd = SD->field_end(); Field != FieldEnd; ++Field) { |
| 759 | // We're done once we hit the flexible array member or run out of |
| 760 | // InitListExpr elements. |
| 761 | if (Field->getType()->isIncompleteArrayType() || |
| 762 | ILEElement == ILE->getNumInits()) |
| 763 | break; |
| 764 | if (Field->isUnnamedBitfield()) |
| 765 | continue; |
Chris Lattner | d1d56df | 2010-12-02 18:29:00 +0000 | [diff] [blame] | 766 | |
Chris Lattner | 8c00ad1 | 2010-12-02 22:52:04 +0000 | [diff] [blame] | 767 | const Expr *E = ILE->getInit(ILEElement++); |
| 768 | |
| 769 | // Reference values are always non-null and have the width of a pointer. |
| 770 | if (Field->getType()->isReferenceType()) |
| 771 | NumNonZeroBytes += CGF.getContext().Target.getPointerWidth(0); |
| 772 | else |
| 773 | NumNonZeroBytes += GetNumNonZeroBytesInInit(E, CGF); |
| 774 | } |
Chris Lattner | d1d56df | 2010-12-02 18:29:00 +0000 | [diff] [blame] | 775 | |
Chris Lattner | 8c00ad1 | 2010-12-02 22:52:04 +0000 | [diff] [blame] | 776 | return NumNonZeroBytes; |
Chris Lattner | d1d56df | 2010-12-02 18:29:00 +0000 | [diff] [blame] | 777 | } |
Chris Lattner | d1d56df | 2010-12-02 18:29:00 +0000 | [diff] [blame] | 778 | } |
| 779 | |
| 780 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 781 | uint64_t NumNonZeroBytes = 0; |
| 782 | for (unsigned i = 0, e = ILE->getNumInits(); i != e; ++i) |
| 783 | NumNonZeroBytes += GetNumNonZeroBytesInInit(ILE->getInit(i), CGF); |
| 784 | return NumNonZeroBytes; |
| 785 | } |
| 786 | |
| 787 | /// CheckAggExprForMemSetUse - If the initializer is large and has a lot of |
| 788 | /// zeros in it, emit a memset and avoid storing the individual zeros. |
| 789 | /// |
| 790 | static void CheckAggExprForMemSetUse(AggValueSlot &Slot, const Expr *E, |
| 791 | CodeGenFunction &CGF) { |
| 792 | // If the slot is already known to be zeroed, nothing to do. Don't mess with |
| 793 | // volatile stores. |
| 794 | if (Slot.isZeroed() || Slot.isVolatile() || Slot.getAddr() == 0) return; |
| 795 | |
| 796 | // If the type is 16-bytes or smaller, prefer individual stores over memset. |
| 797 | std::pair<uint64_t, unsigned> TypeInfo = |
| 798 | CGF.getContext().getTypeInfo(E->getType()); |
| 799 | if (TypeInfo.first/8 <= 16) |
| 800 | return; |
| 801 | |
| 802 | // Check to see if over 3/4 of the initializer are known to be zero. If so, |
| 803 | // we prefer to emit memset + individual stores for the rest. |
| 804 | uint64_t NumNonZeroBytes = GetNumNonZeroBytesInInit(E, CGF); |
| 805 | if (NumNonZeroBytes*4 > TypeInfo.first/8) |
| 806 | return; |
| 807 | |
| 808 | // Okay, it seems like a good idea to use an initial memset, emit the call. |
| 809 | llvm::Constant *SizeVal = CGF.Builder.getInt64(TypeInfo.first/8); |
Benjamin Kramer | 9f0c7cc | 2010-12-30 00:13:21 +0000 | [diff] [blame] | 810 | unsigned Align = TypeInfo.second/8; |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 811 | |
| 812 | llvm::Value *Loc = Slot.getAddr(); |
| 813 | const llvm::Type *BP = llvm::Type::getInt8PtrTy(CGF.getLLVMContext()); |
| 814 | |
| 815 | Loc = CGF.Builder.CreateBitCast(Loc, BP); |
Benjamin Kramer | 9f0c7cc | 2010-12-30 00:13:21 +0000 | [diff] [blame] | 816 | CGF.Builder.CreateMemSet(Loc, CGF.Builder.getInt8(0), SizeVal, Align, false); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 817 | |
| 818 | // Tell the AggExprEmitter that the slot is known zero. |
| 819 | Slot.setZeroed(); |
| 820 | } |
| 821 | |
| 822 | |
| 823 | |
| 824 | |
Mike Stump | e1129a9 | 2009-05-26 18:57:45 +0000 | [diff] [blame] | 825 | /// EmitAggExpr - Emit the computation of the specified expression of aggregate |
| 826 | /// type. The result is computed into DestPtr. Note that if DestPtr is null, |
| 827 | /// the value of the aggregate expression is not needed. If VolatileDest is |
| 828 | /// true, DestPtr cannot be 0. |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 829 | /// |
| 830 | /// \param IsInitializer - true if this evaluation is initializing an |
| 831 | /// object whose lifetime is already being managed. |
Daniel Dunbar | 18aba0d | 2010-02-05 19:38:31 +0000 | [diff] [blame] | 832 | // |
| 833 | // FIXME: Take Qualifiers object. |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 834 | void CodeGenFunction::EmitAggExpr(const Expr *E, AggValueSlot Slot, |
Fariborz Jahanian | 474e2fe | 2010-09-16 00:20:07 +0000 | [diff] [blame] | 835 | bool IgnoreResult) { |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 836 | assert(E && hasAggregateLLVMType(E->getType()) && |
| 837 | "Invalid aggregate expression to emit"); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 838 | assert((Slot.getAddr() != 0 || Slot.isIgnored()) && |
| 839 | "slot has bits but no address"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 840 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 841 | // Optimize the slot if possible. |
| 842 | CheckAggExprForMemSetUse(Slot, E, *this); |
| 843 | |
| 844 | AggExprEmitter(*this, Slot, IgnoreResult).Visit(const_cast<Expr*>(E)); |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 845 | } |
Daniel Dunbar | 7482d12 | 2008-09-09 20:49:46 +0000 | [diff] [blame] | 846 | |
Daniel Dunbar | 18aba0d | 2010-02-05 19:38:31 +0000 | [diff] [blame] | 847 | LValue CodeGenFunction::EmitAggExprToLValue(const Expr *E) { |
| 848 | assert(hasAggregateLLVMType(E->getType()) && "Invalid argument!"); |
Daniel Dunbar | 195337d | 2010-02-09 02:48:28 +0000 | [diff] [blame] | 849 | llvm::Value *Temp = CreateMemTemp(E->getType()); |
Daniel Dunbar | 79c3928 | 2010-08-21 03:15:20 +0000 | [diff] [blame] | 850 | LValue LV = MakeAddrLValue(Temp, E->getType()); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 851 | EmitAggExpr(E, AggValueSlot::forAddr(Temp, LV.isVolatileQualified(), false)); |
Daniel Dunbar | 79c3928 | 2010-08-21 03:15:20 +0000 | [diff] [blame] | 852 | return LV; |
Daniel Dunbar | 18aba0d | 2010-02-05 19:38:31 +0000 | [diff] [blame] | 853 | } |
| 854 | |
Daniel Dunbar | 7482d12 | 2008-09-09 20:49:46 +0000 | [diff] [blame] | 855 | void CodeGenFunction::EmitAggregateCopy(llvm::Value *DestPtr, |
Mike Stump | 27fe2e6 | 2009-05-23 22:29:41 +0000 | [diff] [blame] | 856 | llvm::Value *SrcPtr, QualType Ty, |
| 857 | bool isVolatile) { |
Daniel Dunbar | 7482d12 | 2008-09-09 20:49:46 +0000 | [diff] [blame] | 858 | assert(!Ty->isAnyComplexType() && "Shouldn't happen for complex"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 859 | |
Anders Carlsson | 0d7c583 | 2010-05-03 01:20:20 +0000 | [diff] [blame] | 860 | if (getContext().getLangOptions().CPlusPlus) { |
| 861 | if (const RecordType *RT = Ty->getAs<RecordType>()) { |
Douglas Gregor | e997948 | 2010-05-20 15:39:01 +0000 | [diff] [blame] | 862 | CXXRecordDecl *Record = cast<CXXRecordDecl>(RT->getDecl()); |
| 863 | assert((Record->hasTrivialCopyConstructor() || |
Fariborz Jahanian | 1d49f21 | 2010-05-20 16:46:55 +0000 | [diff] [blame] | 864 | Record->hasTrivialCopyAssignment()) && |
Douglas Gregor | e997948 | 2010-05-20 15:39:01 +0000 | [diff] [blame] | 865 | "Trying to aggregate-copy a type without a trivial copy " |
| 866 | "constructor or assignment operator"); |
Douglas Gregor | 419aa96 | 2010-05-20 15:48:29 +0000 | [diff] [blame] | 867 | // Ignore empty classes in C++. |
Douglas Gregor | e997948 | 2010-05-20 15:39:01 +0000 | [diff] [blame] | 868 | if (Record->isEmpty()) |
Anders Carlsson | 0d7c583 | 2010-05-03 01:20:20 +0000 | [diff] [blame] | 869 | return; |
| 870 | } |
| 871 | } |
| 872 | |
Chris Lattner | 83c9629 | 2009-02-28 18:31:01 +0000 | [diff] [blame] | 873 | // Aggregate assignment turns into llvm.memcpy. This is almost valid per |
Chris Lattner | ca4fc2c | 2009-02-28 18:18:58 +0000 | [diff] [blame] | 874 | // C99 6.5.16.1p3, which states "If the value being stored in an object is |
| 875 | // read from another object that overlaps in anyway the storage of the first |
| 876 | // object, then the overlap shall be exact and the two objects shall have |
| 877 | // qualified or unqualified versions of a compatible type." |
| 878 | // |
Chris Lattner | 83c9629 | 2009-02-28 18:31:01 +0000 | [diff] [blame] | 879 | // memcpy is not defined if the source and destination pointers are exactly |
Chris Lattner | ca4fc2c | 2009-02-28 18:18:58 +0000 | [diff] [blame] | 880 | // equal, but other compilers do this optimization, and almost every memcpy |
| 881 | // implementation handles this case safely. If there is a libc that does not |
| 882 | // safely handle this, we can add a target hook. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 883 | |
Daniel Dunbar | 7482d12 | 2008-09-09 20:49:46 +0000 | [diff] [blame] | 884 | // Get size and alignment info for this aggregate. |
| 885 | std::pair<uint64_t, unsigned> TypeInfo = getContext().getTypeInfo(Ty); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 886 | |
Daniel Dunbar | 7482d12 | 2008-09-09 20:49:46 +0000 | [diff] [blame] | 887 | // FIXME: Handle variable sized types. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 888 | |
Mike Stump | fde6420 | 2009-05-23 04:13:59 +0000 | [diff] [blame] | 889 | // FIXME: If we have a volatile struct, the optimizer can remove what might |
| 890 | // appear to be `extra' memory ops: |
| 891 | // |
| 892 | // volatile struct { int i; } a, b; |
| 893 | // |
| 894 | // int main() { |
| 895 | // a = b; |
| 896 | // a = b; |
| 897 | // } |
| 898 | // |
Mon P Wang | 3ecd785 | 2010-04-04 03:10:52 +0000 | [diff] [blame] | 899 | // we need to use a different call here. We use isVolatile to indicate when |
Mike Stump | 49d1cd5 | 2009-05-26 22:03:21 +0000 | [diff] [blame] | 900 | // either the source or the destination is volatile. |
Mon P Wang | 3ecd785 | 2010-04-04 03:10:52 +0000 | [diff] [blame] | 901 | |
| 902 | const llvm::PointerType *DPT = cast<llvm::PointerType>(DestPtr->getType()); |
Chris Lattner | 098432c | 2010-07-08 00:07:45 +0000 | [diff] [blame] | 903 | const llvm::Type *DBP = |
John McCall | d16c2cf | 2011-02-08 08:22:06 +0000 | [diff] [blame^] | 904 | llvm::Type::getInt8PtrTy(getLLVMContext(), DPT->getAddressSpace()); |
Chris Lattner | 098432c | 2010-07-08 00:07:45 +0000 | [diff] [blame] | 905 | DestPtr = Builder.CreateBitCast(DestPtr, DBP, "tmp"); |
Mon P Wang | 3ecd785 | 2010-04-04 03:10:52 +0000 | [diff] [blame] | 906 | |
| 907 | const llvm::PointerType *SPT = cast<llvm::PointerType>(SrcPtr->getType()); |
Chris Lattner | 098432c | 2010-07-08 00:07:45 +0000 | [diff] [blame] | 908 | const llvm::Type *SBP = |
John McCall | d16c2cf | 2011-02-08 08:22:06 +0000 | [diff] [blame^] | 909 | llvm::Type::getInt8PtrTy(getLLVMContext(), SPT->getAddressSpace()); |
Chris Lattner | 098432c | 2010-07-08 00:07:45 +0000 | [diff] [blame] | 910 | SrcPtr = Builder.CreateBitCast(SrcPtr, SBP, "tmp"); |
Mon P Wang | 3ecd785 | 2010-04-04 03:10:52 +0000 | [diff] [blame] | 911 | |
Fariborz Jahanian | 55bcace | 2010-06-15 22:44:06 +0000 | [diff] [blame] | 912 | if (const RecordType *RecordTy = Ty->getAs<RecordType>()) { |
| 913 | RecordDecl *Record = RecordTy->getDecl(); |
| 914 | if (Record->hasObjectMember()) { |
| 915 | unsigned long size = TypeInfo.first/8; |
| 916 | const llvm::Type *SizeTy = ConvertType(getContext().getSizeType()); |
| 917 | llvm::Value *SizeVal = llvm::ConstantInt::get(SizeTy, size); |
| 918 | CGM.getObjCRuntime().EmitGCMemmoveCollectable(*this, DestPtr, SrcPtr, |
| 919 | SizeVal); |
| 920 | return; |
| 921 | } |
| 922 | } else if (getContext().getAsArrayType(Ty)) { |
| 923 | QualType BaseType = getContext().getBaseElementType(Ty); |
| 924 | if (const RecordType *RecordTy = BaseType->getAs<RecordType>()) { |
| 925 | if (RecordTy->getDecl()->hasObjectMember()) { |
| 926 | unsigned long size = TypeInfo.first/8; |
| 927 | const llvm::Type *SizeTy = ConvertType(getContext().getSizeType()); |
| 928 | llvm::Value *SizeVal = llvm::ConstantInt::get(SizeTy, size); |
| 929 | CGM.getObjCRuntime().EmitGCMemmoveCollectable(*this, DestPtr, SrcPtr, |
| 930 | SizeVal); |
| 931 | return; |
| 932 | } |
| 933 | } |
| 934 | } |
| 935 | |
Benjamin Kramer | 9f0c7cc | 2010-12-30 00:13:21 +0000 | [diff] [blame] | 936 | Builder.CreateMemCpy(DestPtr, SrcPtr, |
| 937 | llvm::ConstantInt::get(IntPtrTy, TypeInfo.first/8), |
| 938 | TypeInfo.second/8, isVolatile); |
Daniel Dunbar | 7482d12 | 2008-09-09 20:49:46 +0000 | [diff] [blame] | 939 | } |