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 | |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame] | 38 | /// We want to use 'dest' as the return slot except under two |
| 39 | /// conditions: |
| 40 | /// - The destination slot requires garbage collection, so we |
| 41 | /// need to use the GC API. |
| 42 | /// - The destination slot is potentially aliased. |
| 43 | bool shouldUseDestForReturnSlot() const { |
| 44 | return !(Dest.requiresGCollection() || Dest.isPotentiallyAliased()); |
| 45 | } |
| 46 | |
John McCall | ef072fd | 2010-05-22 01:48:05 +0000 | [diff] [blame] | 47 | ReturnValueSlot getReturnValueSlot() const { |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame] | 48 | if (!shouldUseDestForReturnSlot()) |
| 49 | return ReturnValueSlot(); |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 50 | |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 51 | return ReturnValueSlot(Dest.getAddr(), Dest.isVolatile()); |
| 52 | } |
| 53 | |
| 54 | AggValueSlot EnsureSlot(QualType T) { |
| 55 | if (!Dest.isIgnored()) return Dest; |
| 56 | return CGF.CreateAggTemp(T, "agg.tmp.ensured"); |
John McCall | ef072fd | 2010-05-22 01:48:05 +0000 | [diff] [blame] | 57 | } |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 58 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 59 | public: |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 60 | AggExprEmitter(CodeGenFunction &cgf, AggValueSlot Dest, |
Fariborz Jahanian | 474e2fe | 2010-09-16 00:20:07 +0000 | [diff] [blame] | 61 | bool ignore) |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 62 | : CGF(cgf), Builder(CGF.Builder), Dest(Dest), |
Fariborz Jahanian | 474e2fe | 2010-09-16 00:20:07 +0000 | [diff] [blame] | 63 | IgnoreResult(ignore) { |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 64 | } |
| 65 | |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 66 | //===--------------------------------------------------------------------===// |
| 67 | // Utilities |
| 68 | //===--------------------------------------------------------------------===// |
| 69 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 70 | /// EmitAggLoadOfLValue - Given an expression with aggregate type that |
| 71 | /// represents a value lvalue, this method emits the address of the lvalue, |
| 72 | /// then loads the result into DestPtr. |
| 73 | void EmitAggLoadOfLValue(const Expr *E); |
Eli Friedman | 922696f | 2008-05-19 17:51:16 +0000 | [diff] [blame] | 74 | |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 75 | /// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. |
Mike Stump | 49d1cd5 | 2009-05-26 22:03:21 +0000 | [diff] [blame] | 76 | void EmitFinalDestCopy(const Expr *E, LValue Src, bool Ignore = false); |
Eli Friedman | bd7d828 | 2011-12-05 22:23:28 +0000 | [diff] [blame] | 77 | void EmitFinalDestCopy(const Expr *E, RValue Src, bool Ignore = false, |
| 78 | unsigned Alignment = 0); |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 79 | |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame] | 80 | void EmitMoveFromReturnSlot(const Expr *E, RValue Src); |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 81 | |
John McCall | 7c2349b | 2011-08-25 20:40:09 +0000 | [diff] [blame] | 82 | AggValueSlot::NeedsGCBarriers_t needsGC(QualType T) { |
Douglas Gregor | e289d81 | 2011-09-13 17:21:33 +0000 | [diff] [blame] | 83 | if (CGF.getLangOptions().getGC() && TypeRequiresGCollection(T)) |
John McCall | 7c2349b | 2011-08-25 20:40:09 +0000 | [diff] [blame] | 84 | return AggValueSlot::NeedsGCBarriers; |
| 85 | return AggValueSlot::DoesNotNeedGCBarriers; |
| 86 | } |
| 87 | |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 88 | bool TypeRequiresGCollection(QualType T); |
| 89 | |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 90 | //===--------------------------------------------------------------------===// |
| 91 | // Visitor Methods |
| 92 | //===--------------------------------------------------------------------===// |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 93 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 94 | void VisitStmt(Stmt *S) { |
Daniel Dunbar | 488e993 | 2008-08-16 00:56:44 +0000 | [diff] [blame] | 95 | CGF.ErrorUnsupported(S, "aggregate expression"); |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 96 | } |
| 97 | void VisitParenExpr(ParenExpr *PE) { Visit(PE->getSubExpr()); } |
Peter Collingbourne | f111d93 | 2011-04-15 00:35:48 +0000 | [diff] [blame] | 98 | void VisitGenericSelectionExpr(GenericSelectionExpr *GE) { |
| 99 | Visit(GE->getResultExpr()); |
| 100 | } |
Eli Friedman | 12444a2 | 2009-01-27 09:03:41 +0000 | [diff] [blame] | 101 | void VisitUnaryExtension(UnaryOperator *E) { Visit(E->getSubExpr()); } |
John McCall | 91a5755 | 2011-07-15 05:09:51 +0000 | [diff] [blame] | 102 | void VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *E) { |
| 103 | return Visit(E->getReplacement()); |
| 104 | } |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 105 | |
| 106 | // l-values. |
Seo Sanghyeon | 9b73b39 | 2007-12-14 02:04:12 +0000 | [diff] [blame] | 107 | void VisitDeclRefExpr(DeclRefExpr *DRE) { EmitAggLoadOfLValue(DRE); } |
| 108 | void VisitMemberExpr(MemberExpr *ME) { EmitAggLoadOfLValue(ME); } |
| 109 | void VisitUnaryDeref(UnaryOperator *E) { EmitAggLoadOfLValue(E); } |
Daniel Dunbar | 5be028f | 2010-01-04 18:47:06 +0000 | [diff] [blame] | 110 | void VisitStringLiteral(StringLiteral *E) { EmitAggLoadOfLValue(E); } |
Douglas Gregor | 751ec9b | 2011-06-17 04:59:12 +0000 | [diff] [blame] | 111 | void VisitCompoundLiteralExpr(CompoundLiteralExpr *E); |
Seo Sanghyeon | 9b73b39 | 2007-12-14 02:04:12 +0000 | [diff] [blame] | 112 | void VisitArraySubscriptExpr(ArraySubscriptExpr *E) { |
| 113 | EmitAggLoadOfLValue(E); |
| 114 | } |
Chris Lattner | f0a990c | 2009-04-21 23:00:09 +0000 | [diff] [blame] | 115 | void VisitBlockDeclRefExpr(const BlockDeclRefExpr *E) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 116 | EmitAggLoadOfLValue(E); |
Chris Lattner | f0a990c | 2009-04-21 23:00:09 +0000 | [diff] [blame] | 117 | } |
| 118 | void VisitPredefinedExpr(const PredefinedExpr *E) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 119 | EmitAggLoadOfLValue(E); |
Chris Lattner | f0a990c | 2009-04-21 23:00:09 +0000 | [diff] [blame] | 120 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 121 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 122 | // Operators. |
Anders Carlsson | 4d8673b | 2009-08-07 23:22:37 +0000 | [diff] [blame] | 123 | void VisitCastExpr(CastExpr *E); |
Anders Carlsson | 148fe67 | 2007-10-31 22:04:46 +0000 | [diff] [blame] | 124 | void VisitCallExpr(const CallExpr *E); |
Chris Lattner | b2d963f | 2007-08-31 22:54:14 +0000 | [diff] [blame] | 125 | void VisitStmtExpr(const StmtExpr *E); |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 126 | void VisitBinaryOperator(const BinaryOperator *BO); |
Fariborz Jahanian | 8bfd31f | 2009-10-22 22:57:31 +0000 | [diff] [blame] | 127 | void VisitPointerToDataMemberBinaryOperator(const BinaryOperator *BO); |
Chris Lattner | 03d6fb9 | 2007-08-21 04:43:17 +0000 | [diff] [blame] | 128 | void VisitBinAssign(const BinaryOperator *E); |
Eli Friedman | 07fa52a | 2008-05-20 07:56:31 +0000 | [diff] [blame] | 129 | void VisitBinComma(const BinaryOperator *E); |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 130 | |
Chris Lattner | 8fdf328 | 2008-06-24 17:04:18 +0000 | [diff] [blame] | 131 | void VisitObjCMessageExpr(ObjCMessageExpr *E); |
Daniel Dunbar | 0a04d77 | 2008-08-23 10:51:21 +0000 | [diff] [blame] | 132 | void VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) { |
| 133 | EmitAggLoadOfLValue(E); |
| 134 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 135 | |
John McCall | 56ca35d | 2011-02-17 10:25:35 +0000 | [diff] [blame] | 136 | void VisitAbstractConditionalOperator(const AbstractConditionalOperator *CO); |
Anders Carlsson | a294ca8 | 2009-07-08 18:33:14 +0000 | [diff] [blame] | 137 | void VisitChooseExpr(const ChooseExpr *CE); |
Devang Patel | 636c3d0 | 2007-10-26 17:44:44 +0000 | [diff] [blame] | 138 | void VisitInitListExpr(InitListExpr *E); |
Anders Carlsson | 30311fa | 2009-12-16 06:57:54 +0000 | [diff] [blame] | 139 | void VisitImplicitValueInitExpr(ImplicitValueInitExpr *E); |
Chris Lattner | 0442108 | 2008-04-08 04:40:51 +0000 | [diff] [blame] | 140 | void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) { |
| 141 | Visit(DAE->getExpr()); |
| 142 | } |
Anders Carlsson | b58d017 | 2009-05-30 23:23:33 +0000 | [diff] [blame] | 143 | void VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E); |
Anders Carlsson | 31ccf37 | 2009-05-03 17:47:16 +0000 | [diff] [blame] | 144 | void VisitCXXConstructExpr(const CXXConstructExpr *E); |
John McCall | 4765fa0 | 2010-12-06 08:20:24 +0000 | [diff] [blame] | 145 | void VisitExprWithCleanups(ExprWithCleanups *E); |
Douglas Gregor | ed8abf1 | 2010-07-08 06:14:04 +0000 | [diff] [blame] | 146 | void VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E); |
Mike Stump | 2710c41 | 2009-11-18 00:40:12 +0000 | [diff] [blame] | 147 | void VisitCXXTypeidExpr(CXXTypeidExpr *E) { EmitAggLoadOfLValue(E); } |
Douglas Gregor | 03e8003 | 2011-06-21 17:03:29 +0000 | [diff] [blame] | 148 | void VisitMaterializeTemporaryExpr(MaterializeTemporaryExpr *E); |
John McCall | e996ffd | 2011-02-16 08:02:54 +0000 | [diff] [blame] | 149 | void VisitOpaqueValueExpr(OpaqueValueExpr *E); |
| 150 | |
John McCall | 4b9c2d2 | 2011-11-06 09:01:30 +0000 | [diff] [blame] | 151 | void VisitPseudoObjectExpr(PseudoObjectExpr *E) { |
| 152 | if (E->isGLValue()) { |
| 153 | LValue LV = CGF.EmitPseudoObjectLValue(E); |
| 154 | return EmitFinalDestCopy(E, LV); |
| 155 | } |
| 156 | |
| 157 | CGF.EmitPseudoObjectRValue(E, EnsureSlot(E->getType())); |
| 158 | } |
| 159 | |
Eli Friedman | b185124 | 2008-05-27 15:51:49 +0000 | [diff] [blame] | 160 | void VisitVAArgExpr(VAArgExpr *E); |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 161 | |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 162 | void EmitInitializationToLValue(Expr *E, LValue Address); |
| 163 | void EmitNullInitializationToLValue(LValue Address); |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 164 | // case Expr::ChooseExprClass: |
Mike Stump | 39406b1 | 2009-12-09 19:24:08 +0000 | [diff] [blame] | 165 | void VisitCXXThrowExpr(const CXXThrowExpr *E) { CGF.EmitCXXThrowExpr(E); } |
Eli Friedman | 276b061 | 2011-10-11 02:20:01 +0000 | [diff] [blame] | 166 | void VisitAtomicExpr(AtomicExpr *E) { |
| 167 | CGF.EmitAtomicExpr(E, EnsureSlot(E->getType()).getAddr()); |
| 168 | } |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 169 | }; |
| 170 | } // end anonymous namespace. |
| 171 | |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 172 | //===----------------------------------------------------------------------===// |
| 173 | // Utilities |
| 174 | //===----------------------------------------------------------------------===// |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 175 | |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 176 | /// EmitAggLoadOfLValue - Given an expression with aggregate type that |
| 177 | /// represents a value lvalue, this method emits the address of the lvalue, |
| 178 | /// then loads the result into DestPtr. |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 179 | void AggExprEmitter::EmitAggLoadOfLValue(const Expr *E) { |
| 180 | LValue LV = CGF.EmitLValue(E); |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 181 | EmitFinalDestCopy(E, LV); |
| 182 | } |
| 183 | |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 184 | /// \brief True if the given aggregate type requires special GC API calls. |
| 185 | bool AggExprEmitter::TypeRequiresGCollection(QualType T) { |
| 186 | // Only record types have members that might require garbage collection. |
| 187 | const RecordType *RecordTy = T->getAs<RecordType>(); |
| 188 | if (!RecordTy) return false; |
| 189 | |
| 190 | // Don't mess with non-trivial C++ types. |
| 191 | RecordDecl *Record = RecordTy->getDecl(); |
| 192 | if (isa<CXXRecordDecl>(Record) && |
| 193 | (!cast<CXXRecordDecl>(Record)->hasTrivialCopyConstructor() || |
| 194 | !cast<CXXRecordDecl>(Record)->hasTrivialDestructor())) |
| 195 | return false; |
| 196 | |
| 197 | // Check whether the type has an object member. |
| 198 | return Record->hasObjectMember(); |
| 199 | } |
| 200 | |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame] | 201 | /// \brief Perform the final move to DestPtr if for some reason |
| 202 | /// getReturnValueSlot() didn't use it directly. |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 203 | /// |
| 204 | /// The idea is that you do something like this: |
| 205 | /// RValue Result = EmitSomething(..., getReturnValueSlot()); |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame] | 206 | /// EmitMoveFromReturnSlot(E, Result); |
| 207 | /// |
| 208 | /// If nothing interferes, this will cause the result to be emitted |
| 209 | /// directly into the return value slot. Otherwise, a final move |
| 210 | /// will be performed. |
| 211 | void AggExprEmitter::EmitMoveFromReturnSlot(const Expr *E, RValue Src) { |
| 212 | if (shouldUseDestForReturnSlot()) { |
| 213 | // Logically, Dest.getAddr() should equal Src.getAggregateAddr(). |
| 214 | // The possibility of undef rvalues complicates that a lot, |
| 215 | // though, so we can't really assert. |
| 216 | return; |
Fariborz Jahanian | 55bcace | 2010-06-15 22:44:06 +0000 | [diff] [blame] | 217 | } |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame] | 218 | |
| 219 | // Otherwise, do a final copy, |
| 220 | assert(Dest.getAddr() != Src.getAggregateAddr()); |
| 221 | EmitFinalDestCopy(E, Src, /*Ignore*/ true); |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 222 | } |
| 223 | |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 224 | /// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. |
Eli Friedman | bd7d828 | 2011-12-05 22:23:28 +0000 | [diff] [blame] | 225 | void AggExprEmitter::EmitFinalDestCopy(const Expr *E, RValue Src, bool Ignore, |
| 226 | unsigned Alignment) { |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 227 | assert(Src.isAggregate() && "value must be aggregate value!"); |
| 228 | |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 229 | // If Dest is ignored, then we're evaluating an aggregate expression |
John McCall | a8f28da | 2010-08-25 02:50:31 +0000 | [diff] [blame] | 230 | // in a context (like an expression statement) that doesn't care |
| 231 | // about the result. C says that an lvalue-to-rvalue conversion is |
| 232 | // performed in these cases; C++ says that it is not. In either |
| 233 | // case, we don't actually need to do anything unless the value is |
| 234 | // volatile. |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 235 | if (Dest.isIgnored()) { |
John McCall | a8f28da | 2010-08-25 02:50:31 +0000 | [diff] [blame] | 236 | if (!Src.isVolatileQualified() || |
| 237 | CGF.CGM.getLangOptions().CPlusPlus || |
| 238 | (IgnoreResult && Ignore)) |
Mike Stump | 9ccb103 | 2009-05-23 22:01:27 +0000 | [diff] [blame] | 239 | return; |
Fariborz Jahanian | 8a97005 | 2010-10-22 22:05:03 +0000 | [diff] [blame] | 240 | |
Mike Stump | 49d1cd5 | 2009-05-26 22:03:21 +0000 | [diff] [blame] | 241 | // If the source is volatile, we must read from it; to do that, we need |
| 242 | // some place to put it. |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 243 | Dest = CGF.CreateAggTemp(E->getType(), "agg.tmp"); |
Mike Stump | 9ccb103 | 2009-05-23 22:01:27 +0000 | [diff] [blame] | 244 | } |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 245 | |
John McCall | d1a5f13 | 2010-09-16 03:13:23 +0000 | [diff] [blame] | 246 | if (Dest.requiresGCollection()) { |
Ken Dyck | 479b61c | 2011-04-24 17:08:00 +0000 | [diff] [blame] | 247 | CharUnits size = CGF.getContext().getTypeSizeInChars(E->getType()); |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 248 | llvm::Type *SizeTy = CGF.ConvertType(CGF.getContext().getSizeType()); |
Ken Dyck | 479b61c | 2011-04-24 17:08:00 +0000 | [diff] [blame] | 249 | llvm::Value *SizeVal = llvm::ConstantInt::get(SizeTy, size.getQuantity()); |
Fariborz Jahanian | 08c3213 | 2009-08-31 19:33:16 +0000 | [diff] [blame] | 250 | CGF.CGM.getObjCRuntime().EmitGCMemmoveCollectable(CGF, |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 251 | Dest.getAddr(), |
| 252 | Src.getAggregateAddr(), |
| 253 | SizeVal); |
Fariborz Jahanian | 08c3213 | 2009-08-31 19:33:16 +0000 | [diff] [blame] | 254 | return; |
| 255 | } |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 256 | // If the result of the assignment is used, copy the LHS there also. |
| 257 | // FIXME: Pass VolatileDest as well. I think we also need to merge volatile |
| 258 | // from the source as well, as we can't eliminate it if either operand |
| 259 | // is volatile, unless copy has volatile for both source and destination.. |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 260 | CGF.EmitAggregateCopy(Dest.getAddr(), Src.getAggregateAddr(), E->getType(), |
Eli Friedman | bd7d828 | 2011-12-05 22:23:28 +0000 | [diff] [blame] | 261 | Dest.isVolatile()|Src.isVolatileQualified(), |
| 262 | Alignment); |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 263 | } |
| 264 | |
| 265 | /// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. |
Mike Stump | 49d1cd5 | 2009-05-26 22:03:21 +0000 | [diff] [blame] | 266 | void AggExprEmitter::EmitFinalDestCopy(const Expr *E, LValue Src, bool Ignore) { |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 267 | assert(Src.isSimple() && "Can't have aggregate bitfield, vector, etc"); |
| 268 | |
Eli Friedman | bd7d828 | 2011-12-05 22:23:28 +0000 | [diff] [blame] | 269 | CharUnits Alignment = std::min(Src.getAlignment(), Dest.getAlignment()); |
| 270 | EmitFinalDestCopy(E, Src.asAggregateRValue(), Ignore, Alignment.getQuantity()); |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 271 | } |
| 272 | |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 273 | //===----------------------------------------------------------------------===// |
| 274 | // Visitor Methods |
| 275 | //===----------------------------------------------------------------------===// |
| 276 | |
Douglas Gregor | 03e8003 | 2011-06-21 17:03:29 +0000 | [diff] [blame] | 277 | void AggExprEmitter::VisitMaterializeTemporaryExpr(MaterializeTemporaryExpr *E){ |
| 278 | Visit(E->GetTemporaryExpr()); |
| 279 | } |
| 280 | |
John McCall | e996ffd | 2011-02-16 08:02:54 +0000 | [diff] [blame] | 281 | void AggExprEmitter::VisitOpaqueValueExpr(OpaqueValueExpr *e) { |
John McCall | 56ca35d | 2011-02-17 10:25:35 +0000 | [diff] [blame] | 282 | EmitFinalDestCopy(e, CGF.getOpaqueLValueMapping(e)); |
John McCall | e996ffd | 2011-02-16 08:02:54 +0000 | [diff] [blame] | 283 | } |
| 284 | |
Douglas Gregor | 751ec9b | 2011-06-17 04:59:12 +0000 | [diff] [blame] | 285 | void |
| 286 | AggExprEmitter::VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { |
Douglas Gregor | 673e98b | 2011-06-17 16:37:20 +0000 | [diff] [blame] | 287 | if (E->getType().isPODType(CGF.getContext())) { |
| 288 | // For a POD type, just emit a load of the lvalue + a copy, because our |
| 289 | // compound literal might alias the destination. |
| 290 | // FIXME: This is a band-aid; the real problem appears to be in our handling |
| 291 | // of assignments, where we store directly into the LHS without checking |
| 292 | // whether anything in the RHS aliases. |
| 293 | EmitAggLoadOfLValue(E); |
| 294 | return; |
| 295 | } |
| 296 | |
Douglas Gregor | 751ec9b | 2011-06-17 04:59:12 +0000 | [diff] [blame] | 297 | AggValueSlot Slot = EnsureSlot(E->getType()); |
| 298 | CGF.EmitAggExpr(E->getInitializer(), Slot); |
| 299 | } |
| 300 | |
| 301 | |
Anders Carlsson | 4d8673b | 2009-08-07 23:22:37 +0000 | [diff] [blame] | 302 | void AggExprEmitter::VisitCastExpr(CastExpr *E) { |
Anders Carlsson | 3016842 | 2009-09-29 01:23:39 +0000 | [diff] [blame] | 303 | switch (E->getCastKind()) { |
Anders Carlsson | 575b374 | 2011-04-11 02:03:26 +0000 | [diff] [blame] | 304 | case CK_Dynamic: { |
Douglas Gregor | 69cfeb1 | 2010-05-14 21:31:02 +0000 | [diff] [blame] | 305 | assert(isa<CXXDynamicCastExpr>(E) && "CK_Dynamic without a dynamic_cast?"); |
| 306 | LValue LV = CGF.EmitCheckedLValue(E->getSubExpr()); |
| 307 | // FIXME: Do we also need to handle property references here? |
| 308 | if (LV.isSimple()) |
| 309 | CGF.EmitDynamicCast(LV.getAddress(), cast<CXXDynamicCastExpr>(E)); |
| 310 | else |
| 311 | CGF.CGM.ErrorUnsupported(E, "non-simple lvalue dynamic_cast"); |
| 312 | |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 313 | if (!Dest.isIgnored()) |
| 314 | CGF.CGM.ErrorUnsupported(E, "lvalue dynamic_cast with a destination"); |
Douglas Gregor | 69cfeb1 | 2010-05-14 21:31:02 +0000 | [diff] [blame] | 315 | break; |
| 316 | } |
| 317 | |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 318 | case CK_ToUnion: { |
John McCall | 6591271 | 2011-04-12 22:02:02 +0000 | [diff] [blame] | 319 | if (Dest.isIgnored()) break; |
| 320 | |
Anders Carlsson | 4d8673b | 2009-08-07 23:22:37 +0000 | [diff] [blame] | 321 | // GCC union extension |
Daniel Dunbar | 79c3928 | 2010-08-21 03:15:20 +0000 | [diff] [blame] | 322 | QualType Ty = E->getSubExpr()->getType(); |
| 323 | QualType PtrTy = CGF.getContext().getPointerType(Ty); |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 324 | llvm::Value *CastPtr = Builder.CreateBitCast(Dest.getAddr(), |
Eli Friedman | 34ebf4d | 2009-06-03 20:45:06 +0000 | [diff] [blame] | 325 | CGF.ConvertType(PtrTy)); |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 326 | EmitInitializationToLValue(E->getSubExpr(), |
| 327 | CGF.MakeAddrLValue(CastPtr, Ty)); |
Anders Carlsson | 3016842 | 2009-09-29 01:23:39 +0000 | [diff] [blame] | 328 | break; |
Nuno Lopes | 7e91627 | 2009-01-15 20:14:33 +0000 | [diff] [blame] | 329 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 330 | |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 331 | case CK_DerivedToBase: |
| 332 | case CK_BaseToDerived: |
| 333 | case CK_UncheckedDerivedToBase: { |
David Blaikie | b219cfc | 2011-09-23 05:06:16 +0000 | [diff] [blame] | 334 | llvm_unreachable("cannot perform hierarchy conversion in EmitAggExpr: " |
Douglas Gregor | 2d6b0e9 | 2010-05-22 05:17:18 +0000 | [diff] [blame] | 335 | "should have been unpacked before we got here"); |
Douglas Gregor | 2d6b0e9 | 2010-05-22 05:17:18 +0000 | [diff] [blame] | 336 | } |
| 337 | |
John McCall | f6a1648 | 2010-12-04 03:47:34 +0000 | [diff] [blame] | 338 | case CK_LValueToRValue: // hope for downstream optimization |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 339 | case CK_NoOp: |
| 340 | case CK_UserDefinedConversion: |
| 341 | case CK_ConstructorConversion: |
Anders Carlsson | 3016842 | 2009-09-29 01:23:39 +0000 | [diff] [blame] | 342 | assert(CGF.getContext().hasSameUnqualifiedType(E->getSubExpr()->getType(), |
| 343 | E->getType()) && |
| 344 | "Implicit cast types must be compatible"); |
| 345 | Visit(E->getSubExpr()); |
| 346 | break; |
John McCall | 0ae287a | 2010-12-01 04:43:34 +0000 | [diff] [blame] | 347 | |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 348 | case CK_LValueBitCast: |
John McCall | 0ae287a | 2010-12-01 04:43:34 +0000 | [diff] [blame] | 349 | llvm_unreachable("should not be emitting lvalue bitcast as rvalue"); |
Douglas Gregor | e39a389 | 2010-07-13 23:17:26 +0000 | [diff] [blame] | 350 | break; |
John McCall | 1de4d4e | 2011-04-07 08:22:57 +0000 | [diff] [blame] | 351 | |
John McCall | 0ae287a | 2010-12-01 04:43:34 +0000 | [diff] [blame] | 352 | case CK_Dependent: |
| 353 | case CK_BitCast: |
| 354 | case CK_ArrayToPointerDecay: |
| 355 | case CK_FunctionToPointerDecay: |
| 356 | case CK_NullToPointer: |
| 357 | case CK_NullToMemberPointer: |
| 358 | case CK_BaseToDerivedMemberPointer: |
| 359 | case CK_DerivedToBaseMemberPointer: |
| 360 | case CK_MemberPointerToBoolean: |
| 361 | case CK_IntegralToPointer: |
| 362 | case CK_PointerToIntegral: |
| 363 | case CK_PointerToBoolean: |
| 364 | case CK_ToVoid: |
| 365 | case CK_VectorSplat: |
| 366 | case CK_IntegralCast: |
| 367 | case CK_IntegralToBoolean: |
| 368 | case CK_IntegralToFloating: |
| 369 | case CK_FloatingToIntegral: |
| 370 | case CK_FloatingToBoolean: |
| 371 | case CK_FloatingCast: |
John McCall | 1d9b3b2 | 2011-09-09 05:25:32 +0000 | [diff] [blame] | 372 | case CK_CPointerToObjCPointerCast: |
| 373 | case CK_BlockPointerToObjCPointerCast: |
John McCall | 0ae287a | 2010-12-01 04:43:34 +0000 | [diff] [blame] | 374 | case CK_AnyPointerToBlockPointerCast: |
| 375 | case CK_ObjCObjectLValueCast: |
| 376 | case CK_FloatingRealToComplex: |
| 377 | case CK_FloatingComplexToReal: |
| 378 | case CK_FloatingComplexToBoolean: |
| 379 | case CK_FloatingComplexCast: |
| 380 | case CK_FloatingComplexToIntegralComplex: |
| 381 | case CK_IntegralRealToComplex: |
| 382 | case CK_IntegralComplexToReal: |
| 383 | case CK_IntegralComplexToBoolean: |
| 384 | case CK_IntegralComplexCast: |
| 385 | case CK_IntegralComplexToFloatingComplex: |
John McCall | 33e56f3 | 2011-09-10 06:18:15 +0000 | [diff] [blame] | 386 | case CK_ARCProduceObject: |
| 387 | case CK_ARCConsumeObject: |
| 388 | case CK_ARCReclaimReturnedObject: |
| 389 | case CK_ARCExtendBlockObject: |
John McCall | 0ae287a | 2010-12-01 04:43:34 +0000 | [diff] [blame] | 390 | llvm_unreachable("cast kind invalid for aggregate types"); |
Anders Carlsson | 3016842 | 2009-09-29 01:23:39 +0000 | [diff] [blame] | 391 | } |
Anders Carlsson | e4707ff | 2008-01-14 06:28:57 +0000 | [diff] [blame] | 392 | } |
| 393 | |
Chris Lattner | 9619662 | 2008-07-26 22:37:01 +0000 | [diff] [blame] | 394 | void AggExprEmitter::VisitCallExpr(const CallExpr *E) { |
Anders Carlsson | e70e8f7 | 2009-05-27 16:45:02 +0000 | [diff] [blame] | 395 | if (E->getCallReturnType()->isReferenceType()) { |
| 396 | EmitAggLoadOfLValue(E); |
| 397 | return; |
| 398 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 399 | |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 400 | RValue RV = CGF.EmitCallExpr(E, getReturnValueSlot()); |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame] | 401 | EmitMoveFromReturnSlot(E, RV); |
Anders Carlsson | 148fe67 | 2007-10-31 22:04:46 +0000 | [diff] [blame] | 402 | } |
Chris Lattner | 9619662 | 2008-07-26 22:37:01 +0000 | [diff] [blame] | 403 | |
| 404 | void AggExprEmitter::VisitObjCMessageExpr(ObjCMessageExpr *E) { |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 405 | RValue RV = CGF.EmitObjCMessageExpr(E, getReturnValueSlot()); |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame] | 406 | EmitMoveFromReturnSlot(E, RV); |
Chris Lattner | 8fdf328 | 2008-06-24 17:04:18 +0000 | [diff] [blame] | 407 | } |
Anders Carlsson | 148fe67 | 2007-10-31 22:04:46 +0000 | [diff] [blame] | 408 | |
Chris Lattner | 9619662 | 2008-07-26 22:37:01 +0000 | [diff] [blame] | 409 | void AggExprEmitter::VisitBinComma(const BinaryOperator *E) { |
John McCall | 2a41637 | 2010-12-05 02:00:02 +0000 | [diff] [blame] | 410 | CGF.EmitIgnoredExpr(E->getLHS()); |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 411 | Visit(E->getRHS()); |
Eli Friedman | 07fa52a | 2008-05-20 07:56:31 +0000 | [diff] [blame] | 412 | } |
| 413 | |
Chris Lattner | b2d963f | 2007-08-31 22:54:14 +0000 | [diff] [blame] | 414 | void AggExprEmitter::VisitStmtExpr(const StmtExpr *E) { |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 415 | CodeGenFunction::StmtExprEvaluation eval(CGF); |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 416 | CGF.EmitCompoundStmt(*E->getSubStmt(), true, Dest); |
Chris Lattner | b2d963f | 2007-08-31 22:54:14 +0000 | [diff] [blame] | 417 | } |
| 418 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 419 | void AggExprEmitter::VisitBinaryOperator(const BinaryOperator *E) { |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 420 | if (E->getOpcode() == BO_PtrMemD || E->getOpcode() == BO_PtrMemI) |
Fariborz Jahanian | 8bfd31f | 2009-10-22 22:57:31 +0000 | [diff] [blame] | 421 | VisitPointerToDataMemberBinaryOperator(E); |
| 422 | else |
| 423 | CGF.ErrorUnsupported(E, "aggregate binary expression"); |
| 424 | } |
| 425 | |
| 426 | void AggExprEmitter::VisitPointerToDataMemberBinaryOperator( |
| 427 | const BinaryOperator *E) { |
| 428 | LValue LV = CGF.EmitPointerToDataMemberBinaryExpr(E); |
| 429 | EmitFinalDestCopy(E, LV); |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 430 | } |
| 431 | |
Chris Lattner | 03d6fb9 | 2007-08-21 04:43:17 +0000 | [diff] [blame] | 432 | void AggExprEmitter::VisitBinAssign(const BinaryOperator *E) { |
Eli Friedman | ff6e2b7 | 2008-02-11 01:09:17 +0000 | [diff] [blame] | 433 | // For an assignment to work, the value on the right has |
| 434 | // to be compatible with the value on the left. |
Eli Friedman | 2dce5f8 | 2009-05-28 23:04:00 +0000 | [diff] [blame] | 435 | assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(), |
| 436 | E->getRHS()->getType()) |
Eli Friedman | ff6e2b7 | 2008-02-11 01:09:17 +0000 | [diff] [blame] | 437 | && "Invalid assignment"); |
John McCall | cd940a1 | 2010-12-06 06:10:02 +0000 | [diff] [blame] | 438 | |
Fariborz Jahanian | 2c7168c | 2011-04-29 21:53:21 +0000 | [diff] [blame] | 439 | if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->getLHS())) |
Fariborz Jahanian | 73a6f8e | 2011-04-29 22:11:28 +0000 | [diff] [blame] | 440 | if (const VarDecl *VD = dyn_cast<VarDecl>(DRE->getDecl())) |
Fariborz Jahanian | 2c7168c | 2011-04-29 21:53:21 +0000 | [diff] [blame] | 441 | if (VD->hasAttr<BlocksAttr>() && |
| 442 | E->getRHS()->HasSideEffects(CGF.getContext())) { |
| 443 | // When __block variable on LHS, the RHS must be evaluated first |
| 444 | // as it may change the 'forwarding' field via call to Block_copy. |
| 445 | LValue RHS = CGF.EmitLValue(E->getRHS()); |
| 446 | LValue LHS = CGF.EmitLValue(E->getLHS()); |
John McCall | 7c2349b | 2011-08-25 20:40:09 +0000 | [diff] [blame] | 447 | Dest = AggValueSlot::forLValue(LHS, AggValueSlot::IsDestructed, |
John McCall | 4418439 | 2011-08-26 07:31:35 +0000 | [diff] [blame] | 448 | needsGC(E->getLHS()->getType()), |
| 449 | AggValueSlot::IsAliased); |
Fariborz Jahanian | 2c7168c | 2011-04-29 21:53:21 +0000 | [diff] [blame] | 450 | EmitFinalDestCopy(E, RHS, true); |
| 451 | return; |
| 452 | } |
Fariborz Jahanian | 2c7168c | 2011-04-29 21:53:21 +0000 | [diff] [blame] | 453 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 454 | LValue LHS = CGF.EmitLValue(E->getLHS()); |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 455 | |
John McCall | db45806 | 2011-11-07 03:59:57 +0000 | [diff] [blame] | 456 | // Codegen the RHS so that it stores directly into the LHS. |
| 457 | AggValueSlot LHSSlot = |
| 458 | AggValueSlot::forLValue(LHS, AggValueSlot::IsDestructed, |
| 459 | needsGC(E->getLHS()->getType()), |
| 460 | AggValueSlot::IsAliased); |
| 461 | CGF.EmitAggExpr(E->getRHS(), LHSSlot, false); |
| 462 | EmitFinalDestCopy(E, LHS, true); |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 463 | } |
| 464 | |
John McCall | 56ca35d | 2011-02-17 10:25:35 +0000 | [diff] [blame] | 465 | void AggExprEmitter:: |
| 466 | VisitAbstractConditionalOperator(const AbstractConditionalOperator *E) { |
Daniel Dunbar | 9615ecb | 2008-11-13 01:38:36 +0000 | [diff] [blame] | 467 | llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true"); |
| 468 | llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false"); |
| 469 | llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 470 | |
John McCall | 56ca35d | 2011-02-17 10:25:35 +0000 | [diff] [blame] | 471 | // Bind the common expression if necessary. |
Eli Friedman | d97927d | 2012-01-06 20:42:20 +0000 | [diff] [blame] | 472 | CodeGenFunction::OpaqueValueMapping binding(CGF, E); |
John McCall | 56ca35d | 2011-02-17 10:25:35 +0000 | [diff] [blame] | 473 | |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 474 | CodeGenFunction::ConditionalEvaluation eval(CGF); |
Eli Friedman | 8e274bd | 2009-12-25 06:17:05 +0000 | [diff] [blame] | 475 | CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 476 | |
John McCall | 74fb0ed | 2010-11-17 00:07:33 +0000 | [diff] [blame] | 477 | // Save whether the destination's lifetime is externally managed. |
John McCall | fd71fb8 | 2011-08-26 08:02:37 +0000 | [diff] [blame] | 478 | bool isExternallyDestructed = Dest.isExternallyDestructed(); |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 479 | |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 480 | eval.begin(CGF); |
| 481 | CGF.EmitBlock(LHSBlock); |
John McCall | 56ca35d | 2011-02-17 10:25:35 +0000 | [diff] [blame] | 482 | Visit(E->getTrueExpr()); |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 483 | eval.end(CGF); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 484 | |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 485 | assert(CGF.HaveInsertPoint() && "expression evaluation ended with no IP!"); |
| 486 | CGF.Builder.CreateBr(ContBlock); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 487 | |
John McCall | 74fb0ed | 2010-11-17 00:07:33 +0000 | [diff] [blame] | 488 | // If the result of an agg expression is unused, then the emission |
| 489 | // of the LHS might need to create a destination slot. That's fine |
| 490 | // with us, and we can safely emit the RHS into the same slot, but |
John McCall | fd71fb8 | 2011-08-26 08:02:37 +0000 | [diff] [blame] | 491 | // we shouldn't claim that it's already being destructed. |
| 492 | Dest.setExternallyDestructed(isExternallyDestructed); |
John McCall | 74fb0ed | 2010-11-17 00:07:33 +0000 | [diff] [blame] | 493 | |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 494 | eval.begin(CGF); |
| 495 | CGF.EmitBlock(RHSBlock); |
John McCall | 56ca35d | 2011-02-17 10:25:35 +0000 | [diff] [blame] | 496 | Visit(E->getFalseExpr()); |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 497 | eval.end(CGF); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 498 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 499 | CGF.EmitBlock(ContBlock); |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 500 | } |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 501 | |
Anders Carlsson | a294ca8 | 2009-07-08 18:33:14 +0000 | [diff] [blame] | 502 | void AggExprEmitter::VisitChooseExpr(const ChooseExpr *CE) { |
| 503 | Visit(CE->getChosenSubExpr(CGF.getContext())); |
| 504 | } |
| 505 | |
Eli Friedman | b185124 | 2008-05-27 15:51:49 +0000 | [diff] [blame] | 506 | void AggExprEmitter::VisitVAArgExpr(VAArgExpr *VE) { |
Daniel Dunbar | 0785570 | 2009-02-11 22:25:55 +0000 | [diff] [blame] | 507 | llvm::Value *ArgValue = CGF.EmitVAListRef(VE->getSubExpr()); |
Anders Carlsson | ddf7cac | 2008-11-04 05:30:00 +0000 | [diff] [blame] | 508 | llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, VE->getType()); |
| 509 | |
Sebastian Redl | 0262f02 | 2009-01-09 21:09:38 +0000 | [diff] [blame] | 510 | if (!ArgPtr) { |
Anders Carlsson | ddf7cac | 2008-11-04 05:30:00 +0000 | [diff] [blame] | 511 | CGF.ErrorUnsupported(VE, "aggregate va_arg expression"); |
Sebastian Redl | 0262f02 | 2009-01-09 21:09:38 +0000 | [diff] [blame] | 512 | return; |
| 513 | } |
| 514 | |
Daniel Dunbar | 79c3928 | 2010-08-21 03:15:20 +0000 | [diff] [blame] | 515 | EmitFinalDestCopy(VE, CGF.MakeAddrLValue(ArgPtr, VE->getType())); |
Eli Friedman | b185124 | 2008-05-27 15:51:49 +0000 | [diff] [blame] | 516 | } |
| 517 | |
Anders Carlsson | b58d017 | 2009-05-30 23:23:33 +0000 | [diff] [blame] | 518 | void AggExprEmitter::VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) { |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 519 | // Ensure that we have a slot, but if we already do, remember |
John McCall | fd71fb8 | 2011-08-26 08:02:37 +0000 | [diff] [blame] | 520 | // whether it was externally destructed. |
| 521 | bool wasExternallyDestructed = Dest.isExternallyDestructed(); |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 522 | Dest = EnsureSlot(E->getType()); |
John McCall | fd71fb8 | 2011-08-26 08:02:37 +0000 | [diff] [blame] | 523 | |
| 524 | // We're going to push a destructor if there isn't already one. |
| 525 | Dest.setExternallyDestructed(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 526 | |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 527 | Visit(E->getSubExpr()); |
Anders Carlsson | b58d017 | 2009-05-30 23:23:33 +0000 | [diff] [blame] | 528 | |
John McCall | fd71fb8 | 2011-08-26 08:02:37 +0000 | [diff] [blame] | 529 | // Push that destructor we promised. |
| 530 | if (!wasExternallyDestructed) |
Peter Collingbourne | 8681160 | 2011-11-27 22:09:22 +0000 | [diff] [blame] | 531 | CGF.EmitCXXTemporary(E->getTemporary(), E->getType(), Dest.getAddr()); |
Anders Carlsson | b58d017 | 2009-05-30 23:23:33 +0000 | [diff] [blame] | 532 | } |
| 533 | |
Anders Carlsson | b14095a | 2009-04-17 00:06:03 +0000 | [diff] [blame] | 534 | void |
Anders Carlsson | 31ccf37 | 2009-05-03 17:47:16 +0000 | [diff] [blame] | 535 | AggExprEmitter::VisitCXXConstructExpr(const CXXConstructExpr *E) { |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 536 | AggValueSlot Slot = EnsureSlot(E->getType()); |
| 537 | CGF.EmitCXXConstructExpr(E, Slot); |
Anders Carlsson | 7f6ad15 | 2009-05-19 04:48:36 +0000 | [diff] [blame] | 538 | } |
| 539 | |
John McCall | 4765fa0 | 2010-12-06 08:20:24 +0000 | [diff] [blame] | 540 | void AggExprEmitter::VisitExprWithCleanups(ExprWithCleanups *E) { |
John McCall | 1a343eb | 2011-11-10 08:15:53 +0000 | [diff] [blame] | 541 | CGF.enterFullExpression(E); |
| 542 | CodeGenFunction::RunCleanupsScope cleanups(CGF); |
| 543 | Visit(E->getSubExpr()); |
Anders Carlsson | b14095a | 2009-04-17 00:06:03 +0000 | [diff] [blame] | 544 | } |
| 545 | |
Douglas Gregor | ed8abf1 | 2010-07-08 06:14:04 +0000 | [diff] [blame] | 546 | void AggExprEmitter::VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E) { |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 547 | QualType T = E->getType(); |
| 548 | AggValueSlot Slot = EnsureSlot(T); |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 549 | EmitNullInitializationToLValue(CGF.MakeAddrLValue(Slot.getAddr(), T)); |
Anders Carlsson | 30311fa | 2009-12-16 06:57:54 +0000 | [diff] [blame] | 550 | } |
| 551 | |
| 552 | void AggExprEmitter::VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) { |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 553 | QualType T = E->getType(); |
| 554 | AggValueSlot Slot = EnsureSlot(T); |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 555 | EmitNullInitializationToLValue(CGF.MakeAddrLValue(Slot.getAddr(), T)); |
Nuno Lopes | 329763b | 2009-10-18 15:18:11 +0000 | [diff] [blame] | 556 | } |
| 557 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 558 | /// isSimpleZero - If emitting this value will obviously just cause a store of |
| 559 | /// zero to memory, return true. This can return false if uncertain, so it just |
| 560 | /// handles simple cases. |
| 561 | static bool isSimpleZero(const Expr *E, CodeGenFunction &CGF) { |
Peter Collingbourne | f111d93 | 2011-04-15 00:35:48 +0000 | [diff] [blame] | 562 | E = E->IgnoreParens(); |
| 563 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 564 | // 0 |
| 565 | if (const IntegerLiteral *IL = dyn_cast<IntegerLiteral>(E)) |
| 566 | return IL->getValue() == 0; |
| 567 | // +0.0 |
| 568 | if (const FloatingLiteral *FL = dyn_cast<FloatingLiteral>(E)) |
| 569 | return FL->getValue().isPosZero(); |
| 570 | // int() |
| 571 | if ((isa<ImplicitValueInitExpr>(E) || isa<CXXScalarValueInitExpr>(E)) && |
| 572 | CGF.getTypes().isZeroInitializable(E->getType())) |
| 573 | return true; |
| 574 | // (int*)0 - Null pointer expressions. |
| 575 | if (const CastExpr *ICE = dyn_cast<CastExpr>(E)) |
| 576 | return ICE->getCastKind() == CK_NullToPointer; |
| 577 | // '\0' |
| 578 | if (const CharacterLiteral *CL = dyn_cast<CharacterLiteral>(E)) |
| 579 | return CL->getValue() == 0; |
| 580 | |
| 581 | // Otherwise, hard case: conservatively return false. |
| 582 | return false; |
| 583 | } |
| 584 | |
| 585 | |
Anders Carlsson | 78e83f8 | 2010-02-03 17:33:16 +0000 | [diff] [blame] | 586 | void |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 587 | AggExprEmitter::EmitInitializationToLValue(Expr* E, LValue LV) { |
| 588 | QualType type = LV.getType(); |
Mike Stump | 7f79f9b | 2009-05-29 15:46:01 +0000 | [diff] [blame] | 589 | // FIXME: Ignore result? |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 590 | // FIXME: Are initializers affected by volatile? |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 591 | if (Dest.isZeroed() && isSimpleZero(E, CGF)) { |
| 592 | // Storing "i32 0" to a zero'd memory location is a noop. |
| 593 | } else if (isa<ImplicitValueInitExpr>(E)) { |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 594 | EmitNullInitializationToLValue(LV); |
| 595 | } else if (type->isReferenceType()) { |
Anders Carlsson | 32f36ba | 2010-06-26 16:35:32 +0000 | [diff] [blame] | 596 | RValue RV = CGF.EmitReferenceBindingToExpr(E, /*InitializedDecl=*/0); |
John McCall | 545d996 | 2011-06-25 02:11:03 +0000 | [diff] [blame] | 597 | CGF.EmitStoreThroughLValue(RV, LV); |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 598 | } else if (type->isAnyComplexType()) { |
Douglas Gregor | 3498bdb | 2009-01-29 17:44:32 +0000 | [diff] [blame] | 599 | CGF.EmitComplexExprIntoAddr(E, LV.getAddress(), false); |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 600 | } else if (CGF.hasAggregateLLVMType(type)) { |
John McCall | 7c2349b | 2011-08-25 20:40:09 +0000 | [diff] [blame] | 601 | CGF.EmitAggExpr(E, AggValueSlot::forLValue(LV, |
| 602 | AggValueSlot::IsDestructed, |
| 603 | AggValueSlot::DoesNotNeedGCBarriers, |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame] | 604 | AggValueSlot::IsNotAliased, |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 605 | Dest.isZeroed())); |
John McCall | f85e193 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 606 | } else if (LV.isSimple()) { |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 607 | CGF.EmitScalarInit(E, /*D=*/0, LV, /*Captured=*/false); |
Eli Friedman | c8ba961 | 2008-05-12 15:06:05 +0000 | [diff] [blame] | 608 | } else { |
John McCall | 545d996 | 2011-06-25 02:11:03 +0000 | [diff] [blame] | 609 | CGF.EmitStoreThroughLValue(RValue::get(CGF.EmitScalarExpr(E)), LV); |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 610 | } |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 611 | } |
| 612 | |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 613 | void AggExprEmitter::EmitNullInitializationToLValue(LValue lv) { |
| 614 | QualType type = lv.getType(); |
| 615 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 616 | // If the destination slot is already zeroed out before the aggregate is |
| 617 | // copied into it, we don't have to emit any zeros here. |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 618 | if (Dest.isZeroed() && CGF.getTypes().isZeroInitializable(type)) |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 619 | return; |
| 620 | |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 621 | if (!CGF.hasAggregateLLVMType(type)) { |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 622 | // For non-aggregates, we can store zero |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 623 | llvm::Value *null = llvm::Constant::getNullValue(CGF.ConvertType(type)); |
John McCall | 545d996 | 2011-06-25 02:11:03 +0000 | [diff] [blame] | 624 | CGF.EmitStoreThroughLValue(RValue::get(null), lv); |
Lauro Ramos Venancio | 145cd89 | 2008-02-19 19:27:31 +0000 | [diff] [blame] | 625 | } else { |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 626 | // There's a potential optimization opportunity in combining |
| 627 | // memsets; that would be easy for arrays, but relatively |
| 628 | // difficult for structures with the current code. |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 629 | CGF.EmitNullInitialization(lv.getAddress(), lv.getType()); |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 630 | } |
| 631 | } |
| 632 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 633 | void AggExprEmitter::VisitInitListExpr(InitListExpr *E) { |
Eli Friedman | a385b3c | 2008-12-02 01:17:45 +0000 | [diff] [blame] | 634 | #if 0 |
Eli Friedman | 13a5be1 | 2009-12-04 01:30:56 +0000 | [diff] [blame] | 635 | // FIXME: Assess perf here? Figure out what cases are worth optimizing here |
| 636 | // (Length of globals? Chunks of zeroed-out space?). |
Eli Friedman | a385b3c | 2008-12-02 01:17:45 +0000 | [diff] [blame] | 637 | // |
Mike Stump | f5408fe | 2009-05-16 07:57:57 +0000 | [diff] [blame] | 638 | // If we can, prefer a copy from a global; this is a lot less code for long |
| 639 | // globals, and it's easier for the current optimizers to analyze. |
Eli Friedman | 13a5be1 | 2009-12-04 01:30:56 +0000 | [diff] [blame] | 640 | if (llvm::Constant* C = CGF.CGM.EmitConstantExpr(E, E->getType(), &CGF)) { |
Eli Friedman | 994ffef | 2008-11-30 02:11:09 +0000 | [diff] [blame] | 641 | llvm::GlobalVariable* GV = |
Eli Friedman | 13a5be1 | 2009-12-04 01:30:56 +0000 | [diff] [blame] | 642 | new llvm::GlobalVariable(CGF.CGM.getModule(), C->getType(), true, |
| 643 | llvm::GlobalValue::InternalLinkage, C, ""); |
Daniel Dunbar | 79c3928 | 2010-08-21 03:15:20 +0000 | [diff] [blame] | 644 | EmitFinalDestCopy(E, CGF.MakeAddrLValue(GV, E->getType())); |
Eli Friedman | 994ffef | 2008-11-30 02:11:09 +0000 | [diff] [blame] | 645 | return; |
| 646 | } |
Eli Friedman | a385b3c | 2008-12-02 01:17:45 +0000 | [diff] [blame] | 647 | #endif |
Chris Lattner | d0db03a | 2010-09-06 00:11:41 +0000 | [diff] [blame] | 648 | if (E->hadArrayRangeDesignator()) |
Douglas Gregor | a9c8780 | 2009-01-29 19:42:23 +0000 | [diff] [blame] | 649 | CGF.ErrorUnsupported(E, "GNU array range designator extension"); |
Douglas Gregor | a9c8780 | 2009-01-29 19:42:23 +0000 | [diff] [blame] | 650 | |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 651 | llvm::Value *DestPtr = Dest.getAddr(); |
| 652 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 653 | // Handle initialization of an array. |
| 654 | if (E->getType()->isArrayType()) { |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 655 | llvm::PointerType *APType = |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 656 | cast<llvm::PointerType>(DestPtr->getType()); |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 657 | llvm::ArrayType *AType = |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 658 | cast<llvm::ArrayType>(APType->getElementType()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 659 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 660 | uint64_t NumInitElements = E->getNumInits(); |
Eli Friedman | 922696f | 2008-05-19 17:51:16 +0000 | [diff] [blame] | 661 | |
Chris Lattner | 9619662 | 2008-07-26 22:37:01 +0000 | [diff] [blame] | 662 | if (E->getNumInits() > 0) { |
| 663 | QualType T1 = E->getType(); |
| 664 | QualType T2 = E->getInit(0)->getType(); |
Eli Friedman | 2dce5f8 | 2009-05-28 23:04:00 +0000 | [diff] [blame] | 665 | if (CGF.getContext().hasSameUnqualifiedType(T1, T2)) { |
Chris Lattner | 9619662 | 2008-07-26 22:37:01 +0000 | [diff] [blame] | 666 | EmitAggLoadOfLValue(E->getInit(0)); |
| 667 | return; |
| 668 | } |
Eli Friedman | 922696f | 2008-05-19 17:51:16 +0000 | [diff] [blame] | 669 | } |
| 670 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 671 | uint64_t NumArrayElements = AType->getNumElements(); |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 672 | assert(NumInitElements <= NumArrayElements); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 673 | |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 674 | QualType elementType = E->getType().getCanonicalType(); |
| 675 | elementType = CGF.getContext().getQualifiedType( |
| 676 | cast<ArrayType>(elementType)->getElementType(), |
| 677 | elementType.getQualifiers() + Dest.getQualifiers()); |
Argyrios Kyrtzidis | 3b4d490 | 2011-04-28 18:53:58 +0000 | [diff] [blame] | 678 | |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 679 | // DestPtr is an array*. Construct an elementType* by drilling |
| 680 | // down a level. |
| 681 | llvm::Value *zero = llvm::ConstantInt::get(CGF.SizeTy, 0); |
| 682 | llvm::Value *indices[] = { zero, zero }; |
| 683 | llvm::Value *begin = |
Jay Foad | 0f6ac7c | 2011-07-22 08:16:57 +0000 | [diff] [blame] | 684 | Builder.CreateInBoundsGEP(DestPtr, indices, "arrayinit.begin"); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 685 | |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 686 | // Exception safety requires us to destroy all the |
| 687 | // already-constructed members if an initializer throws. |
| 688 | // For that, we'll need an EH cleanup. |
| 689 | QualType::DestructionKind dtorKind = elementType.isDestructedType(); |
| 690 | llvm::AllocaInst *endOfInit = 0; |
| 691 | EHScopeStack::stable_iterator cleanup; |
John McCall | 6f103ba | 2011-11-10 10:43:54 +0000 | [diff] [blame] | 692 | llvm::Instruction *cleanupDominator = 0; |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 693 | if (CGF.needsEHCleanup(dtorKind)) { |
| 694 | // In principle we could tell the cleanup where we are more |
| 695 | // directly, but the control flow can get so varied here that it |
| 696 | // would actually be quite complex. Therefore we go through an |
| 697 | // alloca. |
| 698 | endOfInit = CGF.CreateTempAlloca(begin->getType(), |
| 699 | "arrayinit.endOfInit"); |
John McCall | 6f103ba | 2011-11-10 10:43:54 +0000 | [diff] [blame] | 700 | cleanupDominator = Builder.CreateStore(begin, endOfInit); |
John McCall | 2673c68 | 2011-07-11 08:38:19 +0000 | [diff] [blame] | 701 | CGF.pushIrregularPartialArrayCleanup(begin, endOfInit, elementType, |
| 702 | CGF.getDestroyer(dtorKind)); |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 703 | cleanup = CGF.EHStack.stable_begin(); |
| 704 | |
| 705 | // Otherwise, remember that we didn't need a cleanup. |
| 706 | } else { |
| 707 | dtorKind = QualType::DK_none; |
Lauro Ramos Venancio | 145cd89 | 2008-02-19 19:27:31 +0000 | [diff] [blame] | 708 | } |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 709 | |
| 710 | llvm::Value *one = llvm::ConstantInt::get(CGF.SizeTy, 1); |
| 711 | |
| 712 | // The 'current element to initialize'. The invariants on this |
| 713 | // variable are complicated. Essentially, after each iteration of |
| 714 | // the loop, it points to the last initialized element, except |
| 715 | // that it points to the beginning of the array before any |
| 716 | // elements have been initialized. |
| 717 | llvm::Value *element = begin; |
| 718 | |
| 719 | // Emit the explicit initializers. |
| 720 | for (uint64_t i = 0; i != NumInitElements; ++i) { |
| 721 | // Advance to the next element. |
John McCall | 2673c68 | 2011-07-11 08:38:19 +0000 | [diff] [blame] | 722 | if (i > 0) { |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 723 | element = Builder.CreateInBoundsGEP(element, one, "arrayinit.element"); |
| 724 | |
John McCall | 2673c68 | 2011-07-11 08:38:19 +0000 | [diff] [blame] | 725 | // Tell the cleanup that it needs to destroy up to this |
| 726 | // element. TODO: some of these stores can be trivially |
| 727 | // observed to be unnecessary. |
| 728 | if (endOfInit) Builder.CreateStore(element, endOfInit); |
| 729 | } |
| 730 | |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 731 | LValue elementLV = CGF.MakeAddrLValue(element, elementType); |
| 732 | EmitInitializationToLValue(E->getInit(i), elementLV); |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 733 | } |
| 734 | |
| 735 | // Check whether there's a non-trivial array-fill expression. |
| 736 | // Note that this will be a CXXConstructExpr even if the element |
| 737 | // type is an array (or array of array, etc.) of class type. |
| 738 | Expr *filler = E->getArrayFiller(); |
| 739 | bool hasTrivialFiller = true; |
| 740 | if (CXXConstructExpr *cons = dyn_cast_or_null<CXXConstructExpr>(filler)) { |
| 741 | assert(cons->getConstructor()->isDefaultConstructor()); |
| 742 | hasTrivialFiller = cons->getConstructor()->isTrivial(); |
| 743 | } |
| 744 | |
| 745 | // Any remaining elements need to be zero-initialized, possibly |
| 746 | // using the filler expression. We can skip this if the we're |
| 747 | // emitting to zeroed memory. |
| 748 | if (NumInitElements != NumArrayElements && |
| 749 | !(Dest.isZeroed() && hasTrivialFiller && |
| 750 | CGF.getTypes().isZeroInitializable(elementType))) { |
| 751 | |
| 752 | // Use an actual loop. This is basically |
| 753 | // do { *array++ = filler; } while (array != end); |
| 754 | |
| 755 | // Advance to the start of the rest of the array. |
John McCall | 2673c68 | 2011-07-11 08:38:19 +0000 | [diff] [blame] | 756 | if (NumInitElements) { |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 757 | element = Builder.CreateInBoundsGEP(element, one, "arrayinit.start"); |
John McCall | 2673c68 | 2011-07-11 08:38:19 +0000 | [diff] [blame] | 758 | if (endOfInit) Builder.CreateStore(element, endOfInit); |
| 759 | } |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 760 | |
| 761 | // Compute the end of the array. |
| 762 | llvm::Value *end = Builder.CreateInBoundsGEP(begin, |
| 763 | llvm::ConstantInt::get(CGF.SizeTy, NumArrayElements), |
| 764 | "arrayinit.end"); |
| 765 | |
| 766 | llvm::BasicBlock *entryBB = Builder.GetInsertBlock(); |
| 767 | llvm::BasicBlock *bodyBB = CGF.createBasicBlock("arrayinit.body"); |
| 768 | |
| 769 | // Jump into the body. |
| 770 | CGF.EmitBlock(bodyBB); |
| 771 | llvm::PHINode *currentElement = |
| 772 | Builder.CreatePHI(element->getType(), 2, "arrayinit.cur"); |
| 773 | currentElement->addIncoming(element, entryBB); |
| 774 | |
| 775 | // Emit the actual filler expression. |
| 776 | LValue elementLV = CGF.MakeAddrLValue(currentElement, elementType); |
| 777 | if (filler) |
| 778 | EmitInitializationToLValue(filler, elementLV); |
| 779 | else |
| 780 | EmitNullInitializationToLValue(elementLV); |
| 781 | |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 782 | // Move on to the next element. |
| 783 | llvm::Value *nextElement = |
| 784 | Builder.CreateInBoundsGEP(currentElement, one, "arrayinit.next"); |
| 785 | |
John McCall | 2673c68 | 2011-07-11 08:38:19 +0000 | [diff] [blame] | 786 | // Tell the EH cleanup that we finished with the last element. |
| 787 | if (endOfInit) Builder.CreateStore(nextElement, endOfInit); |
| 788 | |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 789 | // Leave the loop if we're done. |
| 790 | llvm::Value *done = Builder.CreateICmpEQ(nextElement, end, |
| 791 | "arrayinit.done"); |
| 792 | llvm::BasicBlock *endBB = CGF.createBasicBlock("arrayinit.end"); |
| 793 | Builder.CreateCondBr(done, endBB, bodyBB); |
| 794 | currentElement->addIncoming(nextElement, Builder.GetInsertBlock()); |
| 795 | |
| 796 | CGF.EmitBlock(endBB); |
| 797 | } |
| 798 | |
| 799 | // Leave the partial-array cleanup if we entered one. |
John McCall | 6f103ba | 2011-11-10 10:43:54 +0000 | [diff] [blame] | 800 | if (dtorKind) CGF.DeactivateCleanupBlock(cleanup, cleanupDominator); |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 801 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 802 | return; |
| 803 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 804 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 805 | assert(E->getType()->isRecordType() && "Only support structs/unions here!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 806 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 807 | // Do struct initialization; this code just sets each individual member |
| 808 | // to the approprate value. This makes bitfield support automatic; |
| 809 | // the disadvantage is that the generated code is more difficult for |
| 810 | // the optimizer, especially with bitfields. |
| 811 | unsigned NumInitElements = E->getNumInits(); |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 812 | RecordDecl *record = E->getType()->castAs<RecordType>()->getDecl(); |
Chris Lattner | bd7de38 | 2010-09-06 00:13:11 +0000 | [diff] [blame] | 813 | |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 814 | if (record->isUnion()) { |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 815 | // Only initialize one field of a union. The field itself is |
| 816 | // specified by the initializer list. |
| 817 | if (!E->getInitializedFieldInUnion()) { |
| 818 | // Empty union; we have nothing to do. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 819 | |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 820 | #ifndef NDEBUG |
| 821 | // Make sure that it's really an empty and not a failure of |
| 822 | // semantic analysis. |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 823 | for (RecordDecl::field_iterator Field = record->field_begin(), |
| 824 | FieldEnd = record->field_end(); |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 825 | Field != FieldEnd; ++Field) |
| 826 | assert(Field->isUnnamedBitfield() && "Only unnamed bitfields allowed"); |
| 827 | #endif |
| 828 | return; |
| 829 | } |
| 830 | |
| 831 | // FIXME: volatility |
| 832 | FieldDecl *Field = E->getInitializedFieldInUnion(); |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 833 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 834 | LValue FieldLoc = CGF.EmitLValueForFieldInitialization(DestPtr, Field, 0); |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 835 | if (NumInitElements) { |
| 836 | // Store the initializer into the field |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 837 | EmitInitializationToLValue(E->getInit(0), FieldLoc); |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 838 | } else { |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 839 | // Default-initialize to null. |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 840 | EmitNullInitializationToLValue(FieldLoc); |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 841 | } |
| 842 | |
| 843 | return; |
| 844 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 845 | |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 846 | // We'll need to enter cleanup scopes in case any of the member |
| 847 | // initializers throw an exception. |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 848 | SmallVector<EHScopeStack::stable_iterator, 16> cleanups; |
John McCall | 6f103ba | 2011-11-10 10:43:54 +0000 | [diff] [blame] | 849 | llvm::Instruction *cleanupDominator = 0; |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 850 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 851 | // Here we iterate over the fields; this makes it simpler to both |
| 852 | // default-initialize fields and skip over unnamed fields. |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 853 | unsigned curInitIndex = 0; |
| 854 | for (RecordDecl::field_iterator field = record->field_begin(), |
| 855 | fieldEnd = record->field_end(); |
| 856 | field != fieldEnd; ++field) { |
| 857 | // We're done once we hit the flexible array member. |
| 858 | if (field->getType()->isIncompleteArrayType()) |
Douglas Gregor | 44b4321 | 2008-12-11 16:49:14 +0000 | [diff] [blame] | 859 | break; |
| 860 | |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 861 | // Always skip anonymous bitfields. |
| 862 | if (field->isUnnamedBitfield()) |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 863 | continue; |
Douglas Gregor | 34e7946 | 2009-01-28 23:36:17 +0000 | [diff] [blame] | 864 | |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 865 | // We're done if we reach the end of the explicit initializers, we |
| 866 | // have a zeroed object, and the rest of the fields are |
| 867 | // zero-initializable. |
| 868 | if (curInitIndex == NumInitElements && Dest.isZeroed() && |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 869 | CGF.getTypes().isZeroInitializable(E->getType())) |
| 870 | break; |
| 871 | |
Eli Friedman | 1e692ac | 2008-06-13 23:01:12 +0000 | [diff] [blame] | 872 | // FIXME: volatility |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 873 | LValue LV = CGF.EmitLValueForFieldInitialization(DestPtr, *field, 0); |
Fariborz Jahanian | 14674ff | 2009-05-27 19:54:11 +0000 | [diff] [blame] | 874 | // We never generate write-barries for initialized fields. |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 875 | LV.setNonGC(true); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 876 | |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 877 | if (curInitIndex < NumInitElements) { |
Chris Lattner | b35baae | 2010-03-08 21:08:07 +0000 | [diff] [blame] | 878 | // Store the initializer into the field. |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 879 | EmitInitializationToLValue(E->getInit(curInitIndex++), LV); |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 880 | } else { |
| 881 | // We're out of initalizers; default-initialize to null |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 882 | EmitNullInitializationToLValue(LV); |
| 883 | } |
| 884 | |
| 885 | // Push a destructor if necessary. |
| 886 | // FIXME: if we have an array of structures, all explicitly |
| 887 | // initialized, we can end up pushing a linear number of cleanups. |
| 888 | bool pushedCleanup = false; |
| 889 | if (QualType::DestructionKind dtorKind |
| 890 | = field->getType().isDestructedType()) { |
| 891 | assert(LV.isSimple()); |
| 892 | if (CGF.needsEHCleanup(dtorKind)) { |
John McCall | 6f103ba | 2011-11-10 10:43:54 +0000 | [diff] [blame] | 893 | if (!cleanupDominator) |
| 894 | cleanupDominator = CGF.Builder.CreateUnreachable(); // placeholder |
| 895 | |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 896 | CGF.pushDestroy(EHCleanup, LV.getAddress(), field->getType(), |
| 897 | CGF.getDestroyer(dtorKind), false); |
| 898 | cleanups.push_back(CGF.EHStack.stable_begin()); |
| 899 | pushedCleanup = true; |
| 900 | } |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 901 | } |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 902 | |
| 903 | // If the GEP didn't get used because of a dead zero init or something |
| 904 | // else, clean it up for -O0 builds and general tidiness. |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 905 | if (!pushedCleanup && LV.isSimple()) |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 906 | if (llvm::GetElementPtrInst *GEP = |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 907 | dyn_cast<llvm::GetElementPtrInst>(LV.getAddress())) |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 908 | if (GEP->use_empty()) |
| 909 | GEP->eraseFromParent(); |
Lauro Ramos Venancio | 145cd89 | 2008-02-19 19:27:31 +0000 | [diff] [blame] | 910 | } |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 911 | |
| 912 | // Deactivate all the partial cleanups in reverse order, which |
| 913 | // generally means popping them. |
| 914 | for (unsigned i = cleanups.size(); i != 0; --i) |
John McCall | 6f103ba | 2011-11-10 10:43:54 +0000 | [diff] [blame] | 915 | CGF.DeactivateCleanupBlock(cleanups[i-1], cleanupDominator); |
| 916 | |
| 917 | // Destroy the placeholder if we made one. |
| 918 | if (cleanupDominator) |
| 919 | cleanupDominator->eraseFromParent(); |
Devang Patel | 636c3d0 | 2007-10-26 17:44:44 +0000 | [diff] [blame] | 920 | } |
| 921 | |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 922 | //===----------------------------------------------------------------------===// |
| 923 | // Entry Points into this File |
| 924 | //===----------------------------------------------------------------------===// |
| 925 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 926 | /// GetNumNonZeroBytesInInit - Get an approximate count of the number of |
| 927 | /// non-zero bytes that will be stored when outputting the initializer for the |
| 928 | /// specified initializer expression. |
Ken Dyck | 02c4533 | 2011-04-24 17:17:56 +0000 | [diff] [blame] | 929 | static CharUnits GetNumNonZeroBytesInInit(const Expr *E, CodeGenFunction &CGF) { |
Peter Collingbourne | f111d93 | 2011-04-15 00:35:48 +0000 | [diff] [blame] | 930 | E = E->IgnoreParens(); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 931 | |
| 932 | // 0 and 0.0 won't require any non-zero stores! |
Ken Dyck | 02c4533 | 2011-04-24 17:17:56 +0000 | [diff] [blame] | 933 | if (isSimpleZero(E, CGF)) return CharUnits::Zero(); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 934 | |
| 935 | // If this is an initlist expr, sum up the size of sizes of the (present) |
| 936 | // elements. If this is something weird, assume the whole thing is non-zero. |
| 937 | const InitListExpr *ILE = dyn_cast<InitListExpr>(E); |
| 938 | if (ILE == 0 || !CGF.getTypes().isZeroInitializable(ILE->getType())) |
Ken Dyck | 02c4533 | 2011-04-24 17:17:56 +0000 | [diff] [blame] | 939 | return CGF.getContext().getTypeSizeInChars(E->getType()); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 940 | |
Chris Lattner | d1d56df | 2010-12-02 18:29:00 +0000 | [diff] [blame] | 941 | // InitListExprs for structs have to be handled carefully. If there are |
| 942 | // reference members, we need to consider the size of the reference, not the |
| 943 | // referencee. InitListExprs for unions and arrays can't have references. |
Chris Lattner | 8c00ad1 | 2010-12-02 22:52:04 +0000 | [diff] [blame] | 944 | if (const RecordType *RT = E->getType()->getAs<RecordType>()) { |
| 945 | if (!RT->isUnionType()) { |
| 946 | RecordDecl *SD = E->getType()->getAs<RecordType>()->getDecl(); |
Ken Dyck | 02c4533 | 2011-04-24 17:17:56 +0000 | [diff] [blame] | 947 | CharUnits NumNonZeroBytes = CharUnits::Zero(); |
Chris Lattner | 8c00ad1 | 2010-12-02 22:52:04 +0000 | [diff] [blame] | 948 | |
| 949 | unsigned ILEElement = 0; |
| 950 | for (RecordDecl::field_iterator Field = SD->field_begin(), |
| 951 | FieldEnd = SD->field_end(); Field != FieldEnd; ++Field) { |
| 952 | // We're done once we hit the flexible array member or run out of |
| 953 | // InitListExpr elements. |
| 954 | if (Field->getType()->isIncompleteArrayType() || |
| 955 | ILEElement == ILE->getNumInits()) |
| 956 | break; |
| 957 | if (Field->isUnnamedBitfield()) |
| 958 | continue; |
Chris Lattner | d1d56df | 2010-12-02 18:29:00 +0000 | [diff] [blame] | 959 | |
Chris Lattner | 8c00ad1 | 2010-12-02 22:52:04 +0000 | [diff] [blame] | 960 | const Expr *E = ILE->getInit(ILEElement++); |
| 961 | |
| 962 | // Reference values are always non-null and have the width of a pointer. |
| 963 | if (Field->getType()->isReferenceType()) |
Ken Dyck | 02c4533 | 2011-04-24 17:17:56 +0000 | [diff] [blame] | 964 | NumNonZeroBytes += CGF.getContext().toCharUnitsFromBits( |
Douglas Gregor | bcfd1f5 | 2011-09-02 00:18:52 +0000 | [diff] [blame] | 965 | CGF.getContext().getTargetInfo().getPointerWidth(0)); |
Chris Lattner | 8c00ad1 | 2010-12-02 22:52:04 +0000 | [diff] [blame] | 966 | else |
| 967 | NumNonZeroBytes += GetNumNonZeroBytesInInit(E, CGF); |
| 968 | } |
Chris Lattner | d1d56df | 2010-12-02 18:29:00 +0000 | [diff] [blame] | 969 | |
Chris Lattner | 8c00ad1 | 2010-12-02 22:52:04 +0000 | [diff] [blame] | 970 | return NumNonZeroBytes; |
Chris Lattner | d1d56df | 2010-12-02 18:29:00 +0000 | [diff] [blame] | 971 | } |
Chris Lattner | d1d56df | 2010-12-02 18:29:00 +0000 | [diff] [blame] | 972 | } |
| 973 | |
| 974 | |
Ken Dyck | 02c4533 | 2011-04-24 17:17:56 +0000 | [diff] [blame] | 975 | CharUnits NumNonZeroBytes = CharUnits::Zero(); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 976 | for (unsigned i = 0, e = ILE->getNumInits(); i != e; ++i) |
| 977 | NumNonZeroBytes += GetNumNonZeroBytesInInit(ILE->getInit(i), CGF); |
| 978 | return NumNonZeroBytes; |
| 979 | } |
| 980 | |
| 981 | /// CheckAggExprForMemSetUse - If the initializer is large and has a lot of |
| 982 | /// zeros in it, emit a memset and avoid storing the individual zeros. |
| 983 | /// |
| 984 | static void CheckAggExprForMemSetUse(AggValueSlot &Slot, const Expr *E, |
| 985 | CodeGenFunction &CGF) { |
| 986 | // If the slot is already known to be zeroed, nothing to do. Don't mess with |
| 987 | // volatile stores. |
| 988 | if (Slot.isZeroed() || Slot.isVolatile() || Slot.getAddr() == 0) return; |
Argyrios Kyrtzidis | 657baf1 | 2011-04-28 22:57:55 +0000 | [diff] [blame] | 989 | |
| 990 | // C++ objects with a user-declared constructor don't need zero'ing. |
| 991 | if (CGF.getContext().getLangOptions().CPlusPlus) |
| 992 | if (const RecordType *RT = CGF.getContext() |
| 993 | .getBaseElementType(E->getType())->getAs<RecordType>()) { |
| 994 | const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); |
| 995 | if (RD->hasUserDeclaredConstructor()) |
| 996 | return; |
| 997 | } |
| 998 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 999 | // If the type is 16-bytes or smaller, prefer individual stores over memset. |
Ken Dyck | 5ff1a35 | 2011-04-24 17:25:32 +0000 | [diff] [blame] | 1000 | std::pair<CharUnits, CharUnits> TypeInfo = |
| 1001 | CGF.getContext().getTypeInfoInChars(E->getType()); |
| 1002 | if (TypeInfo.first <= CharUnits::fromQuantity(16)) |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1003 | return; |
| 1004 | |
| 1005 | // Check to see if over 3/4 of the initializer are known to be zero. If so, |
| 1006 | // we prefer to emit memset + individual stores for the rest. |
Ken Dyck | 5ff1a35 | 2011-04-24 17:25:32 +0000 | [diff] [blame] | 1007 | CharUnits NumNonZeroBytes = GetNumNonZeroBytesInInit(E, CGF); |
| 1008 | if (NumNonZeroBytes*4 > TypeInfo.first) |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1009 | return; |
| 1010 | |
| 1011 | // Okay, it seems like a good idea to use an initial memset, emit the call. |
Ken Dyck | 5ff1a35 | 2011-04-24 17:25:32 +0000 | [diff] [blame] | 1012 | llvm::Constant *SizeVal = CGF.Builder.getInt64(TypeInfo.first.getQuantity()); |
| 1013 | CharUnits Align = TypeInfo.second; |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1014 | |
| 1015 | llvm::Value *Loc = Slot.getAddr(); |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 1016 | llvm::Type *BP = llvm::Type::getInt8PtrTy(CGF.getLLVMContext()); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1017 | |
| 1018 | Loc = CGF.Builder.CreateBitCast(Loc, BP); |
Ken Dyck | 5ff1a35 | 2011-04-24 17:25:32 +0000 | [diff] [blame] | 1019 | CGF.Builder.CreateMemSet(Loc, CGF.Builder.getInt8(0), SizeVal, |
| 1020 | Align.getQuantity(), false); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1021 | |
| 1022 | // Tell the AggExprEmitter that the slot is known zero. |
| 1023 | Slot.setZeroed(); |
| 1024 | } |
| 1025 | |
| 1026 | |
| 1027 | |
| 1028 | |
Mike Stump | e1129a9 | 2009-05-26 18:57:45 +0000 | [diff] [blame] | 1029 | /// EmitAggExpr - Emit the computation of the specified expression of aggregate |
| 1030 | /// type. The result is computed into DestPtr. Note that if DestPtr is null, |
| 1031 | /// the value of the aggregate expression is not needed. If VolatileDest is |
| 1032 | /// true, DestPtr cannot be 0. |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 1033 | /// |
| 1034 | /// \param IsInitializer - true if this evaluation is initializing an |
| 1035 | /// object whose lifetime is already being managed. |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 1036 | void CodeGenFunction::EmitAggExpr(const Expr *E, AggValueSlot Slot, |
Fariborz Jahanian | 474e2fe | 2010-09-16 00:20:07 +0000 | [diff] [blame] | 1037 | bool IgnoreResult) { |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 1038 | assert(E && hasAggregateLLVMType(E->getType()) && |
| 1039 | "Invalid aggregate expression to emit"); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1040 | assert((Slot.getAddr() != 0 || Slot.isIgnored()) && |
| 1041 | "slot has bits but no address"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1042 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1043 | // Optimize the slot if possible. |
| 1044 | CheckAggExprForMemSetUse(Slot, E, *this); |
| 1045 | |
| 1046 | AggExprEmitter(*this, Slot, IgnoreResult).Visit(const_cast<Expr*>(E)); |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 1047 | } |
Daniel Dunbar | 7482d12 | 2008-09-09 20:49:46 +0000 | [diff] [blame] | 1048 | |
Daniel Dunbar | 18aba0d | 2010-02-05 19:38:31 +0000 | [diff] [blame] | 1049 | LValue CodeGenFunction::EmitAggExprToLValue(const Expr *E) { |
| 1050 | assert(hasAggregateLLVMType(E->getType()) && "Invalid argument!"); |
Daniel Dunbar | 195337d | 2010-02-09 02:48:28 +0000 | [diff] [blame] | 1051 | llvm::Value *Temp = CreateMemTemp(E->getType()); |
Daniel Dunbar | 79c3928 | 2010-08-21 03:15:20 +0000 | [diff] [blame] | 1052 | LValue LV = MakeAddrLValue(Temp, E->getType()); |
John McCall | 7c2349b | 2011-08-25 20:40:09 +0000 | [diff] [blame] | 1053 | EmitAggExpr(E, AggValueSlot::forLValue(LV, AggValueSlot::IsNotDestructed, |
John McCall | 4418439 | 2011-08-26 07:31:35 +0000 | [diff] [blame] | 1054 | AggValueSlot::DoesNotNeedGCBarriers, |
| 1055 | AggValueSlot::IsNotAliased)); |
Daniel Dunbar | 79c3928 | 2010-08-21 03:15:20 +0000 | [diff] [blame] | 1056 | return LV; |
Daniel Dunbar | 18aba0d | 2010-02-05 19:38:31 +0000 | [diff] [blame] | 1057 | } |
| 1058 | |
Daniel Dunbar | 7482d12 | 2008-09-09 20:49:46 +0000 | [diff] [blame] | 1059 | void CodeGenFunction::EmitAggregateCopy(llvm::Value *DestPtr, |
Mike Stump | 27fe2e6 | 2009-05-23 22:29:41 +0000 | [diff] [blame] | 1060 | llvm::Value *SrcPtr, QualType Ty, |
Eli Friedman | bd7d828 | 2011-12-05 22:23:28 +0000 | [diff] [blame] | 1061 | bool isVolatile, unsigned Alignment) { |
Daniel Dunbar | 7482d12 | 2008-09-09 20:49:46 +0000 | [diff] [blame] | 1062 | assert(!Ty->isAnyComplexType() && "Shouldn't happen for complex"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1063 | |
Anders Carlsson | 0d7c583 | 2010-05-03 01:20:20 +0000 | [diff] [blame] | 1064 | if (getContext().getLangOptions().CPlusPlus) { |
| 1065 | if (const RecordType *RT = Ty->getAs<RecordType>()) { |
Douglas Gregor | e997948 | 2010-05-20 15:39:01 +0000 | [diff] [blame] | 1066 | CXXRecordDecl *Record = cast<CXXRecordDecl>(RT->getDecl()); |
| 1067 | assert((Record->hasTrivialCopyConstructor() || |
Douglas Gregor | b2b5658 | 2011-09-06 16:26:56 +0000 | [diff] [blame] | 1068 | Record->hasTrivialCopyAssignment() || |
| 1069 | Record->hasTrivialMoveConstructor() || |
| 1070 | Record->hasTrivialMoveAssignment()) && |
Douglas Gregor | e997948 | 2010-05-20 15:39:01 +0000 | [diff] [blame] | 1071 | "Trying to aggregate-copy a type without a trivial copy " |
| 1072 | "constructor or assignment operator"); |
Douglas Gregor | 419aa96 | 2010-05-20 15:48:29 +0000 | [diff] [blame] | 1073 | // Ignore empty classes in C++. |
Douglas Gregor | e997948 | 2010-05-20 15:39:01 +0000 | [diff] [blame] | 1074 | if (Record->isEmpty()) |
Anders Carlsson | 0d7c583 | 2010-05-03 01:20:20 +0000 | [diff] [blame] | 1075 | return; |
| 1076 | } |
| 1077 | } |
| 1078 | |
Chris Lattner | 83c9629 | 2009-02-28 18:31:01 +0000 | [diff] [blame] | 1079 | // Aggregate assignment turns into llvm.memcpy. This is almost valid per |
Chris Lattner | ca4fc2c | 2009-02-28 18:18:58 +0000 | [diff] [blame] | 1080 | // C99 6.5.16.1p3, which states "If the value being stored in an object is |
| 1081 | // read from another object that overlaps in anyway the storage of the first |
| 1082 | // object, then the overlap shall be exact and the two objects shall have |
| 1083 | // qualified or unqualified versions of a compatible type." |
| 1084 | // |
Chris Lattner | 83c9629 | 2009-02-28 18:31:01 +0000 | [diff] [blame] | 1085 | // memcpy is not defined if the source and destination pointers are exactly |
Chris Lattner | ca4fc2c | 2009-02-28 18:18:58 +0000 | [diff] [blame] | 1086 | // equal, but other compilers do this optimization, and almost every memcpy |
| 1087 | // implementation handles this case safely. If there is a libc that does not |
| 1088 | // safely handle this, we can add a target hook. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1089 | |
Daniel Dunbar | 7482d12 | 2008-09-09 20:49:46 +0000 | [diff] [blame] | 1090 | // Get size and alignment info for this aggregate. |
Ken Dyck | 1a8c15a | 2011-04-24 17:37:26 +0000 | [diff] [blame] | 1091 | std::pair<CharUnits, CharUnits> TypeInfo = |
| 1092 | getContext().getTypeInfoInChars(Ty); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1093 | |
Eli Friedman | bd7d828 | 2011-12-05 22:23:28 +0000 | [diff] [blame] | 1094 | if (!Alignment) |
| 1095 | Alignment = TypeInfo.second.getQuantity(); |
| 1096 | |
Daniel Dunbar | 7482d12 | 2008-09-09 20:49:46 +0000 | [diff] [blame] | 1097 | // FIXME: Handle variable sized types. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1098 | |
Mike Stump | fde6420 | 2009-05-23 04:13:59 +0000 | [diff] [blame] | 1099 | // FIXME: If we have a volatile struct, the optimizer can remove what might |
| 1100 | // appear to be `extra' memory ops: |
| 1101 | // |
| 1102 | // volatile struct { int i; } a, b; |
| 1103 | // |
| 1104 | // int main() { |
| 1105 | // a = b; |
| 1106 | // a = b; |
| 1107 | // } |
| 1108 | // |
Mon P Wang | 3ecd785 | 2010-04-04 03:10:52 +0000 | [diff] [blame] | 1109 | // 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] | 1110 | // either the source or the destination is volatile. |
Mon P Wang | 3ecd785 | 2010-04-04 03:10:52 +0000 | [diff] [blame] | 1111 | |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 1112 | llvm::PointerType *DPT = cast<llvm::PointerType>(DestPtr->getType()); |
| 1113 | llvm::Type *DBP = |
John McCall | d16c2cf | 2011-02-08 08:22:06 +0000 | [diff] [blame] | 1114 | llvm::Type::getInt8PtrTy(getLLVMContext(), DPT->getAddressSpace()); |
Benjamin Kramer | 578faa8 | 2011-09-27 21:06:10 +0000 | [diff] [blame] | 1115 | DestPtr = Builder.CreateBitCast(DestPtr, DBP); |
Mon P Wang | 3ecd785 | 2010-04-04 03:10:52 +0000 | [diff] [blame] | 1116 | |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 1117 | llvm::PointerType *SPT = cast<llvm::PointerType>(SrcPtr->getType()); |
| 1118 | llvm::Type *SBP = |
John McCall | d16c2cf | 2011-02-08 08:22:06 +0000 | [diff] [blame] | 1119 | llvm::Type::getInt8PtrTy(getLLVMContext(), SPT->getAddressSpace()); |
Benjamin Kramer | 578faa8 | 2011-09-27 21:06:10 +0000 | [diff] [blame] | 1120 | SrcPtr = Builder.CreateBitCast(SrcPtr, SBP); |
Mon P Wang | 3ecd785 | 2010-04-04 03:10:52 +0000 | [diff] [blame] | 1121 | |
John McCall | f85e193 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 1122 | // Don't do any of the memmove_collectable tests if GC isn't set. |
Douglas Gregor | e289d81 | 2011-09-13 17:21:33 +0000 | [diff] [blame] | 1123 | if (CGM.getLangOptions().getGC() == LangOptions::NonGC) { |
John McCall | f85e193 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 1124 | // fall through |
| 1125 | } else if (const RecordType *RecordTy = Ty->getAs<RecordType>()) { |
Fariborz Jahanian | 55bcace | 2010-06-15 22:44:06 +0000 | [diff] [blame] | 1126 | RecordDecl *Record = RecordTy->getDecl(); |
| 1127 | if (Record->hasObjectMember()) { |
Ken Dyck | 1a8c15a | 2011-04-24 17:37:26 +0000 | [diff] [blame] | 1128 | CharUnits size = TypeInfo.first; |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 1129 | llvm::Type *SizeTy = ConvertType(getContext().getSizeType()); |
Ken Dyck | 1a8c15a | 2011-04-24 17:37:26 +0000 | [diff] [blame] | 1130 | llvm::Value *SizeVal = llvm::ConstantInt::get(SizeTy, size.getQuantity()); |
Fariborz Jahanian | 55bcace | 2010-06-15 22:44:06 +0000 | [diff] [blame] | 1131 | CGM.getObjCRuntime().EmitGCMemmoveCollectable(*this, DestPtr, SrcPtr, |
| 1132 | SizeVal); |
| 1133 | return; |
| 1134 | } |
John McCall | f85e193 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 1135 | } else if (Ty->isArrayType()) { |
Fariborz Jahanian | 55bcace | 2010-06-15 22:44:06 +0000 | [diff] [blame] | 1136 | QualType BaseType = getContext().getBaseElementType(Ty); |
| 1137 | if (const RecordType *RecordTy = BaseType->getAs<RecordType>()) { |
| 1138 | if (RecordTy->getDecl()->hasObjectMember()) { |
Ken Dyck | 1a8c15a | 2011-04-24 17:37:26 +0000 | [diff] [blame] | 1139 | CharUnits size = TypeInfo.first; |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 1140 | llvm::Type *SizeTy = ConvertType(getContext().getSizeType()); |
Ken Dyck | 1a8c15a | 2011-04-24 17:37:26 +0000 | [diff] [blame] | 1141 | llvm::Value *SizeVal = |
| 1142 | llvm::ConstantInt::get(SizeTy, size.getQuantity()); |
Fariborz Jahanian | 55bcace | 2010-06-15 22:44:06 +0000 | [diff] [blame] | 1143 | CGM.getObjCRuntime().EmitGCMemmoveCollectable(*this, DestPtr, SrcPtr, |
| 1144 | SizeVal); |
| 1145 | return; |
| 1146 | } |
| 1147 | } |
| 1148 | } |
| 1149 | |
Benjamin Kramer | 9f0c7cc | 2010-12-30 00:13:21 +0000 | [diff] [blame] | 1150 | Builder.CreateMemCpy(DestPtr, SrcPtr, |
Ken Dyck | 1a8c15a | 2011-04-24 17:37:26 +0000 | [diff] [blame] | 1151 | llvm::ConstantInt::get(IntPtrTy, |
| 1152 | TypeInfo.first.getQuantity()), |
Eli Friedman | bd7d828 | 2011-12-05 22:23:28 +0000 | [diff] [blame] | 1153 | Alignment, isVolatile); |
Daniel Dunbar | 7482d12 | 2008-09-09 20:49:46 +0000 | [diff] [blame] | 1154 | } |