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); |
| 77 | void EmitFinalDestCopy(const Expr *E, RValue Src, bool Ignore = false); |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 78 | |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame^] | 79 | void EmitMoveFromReturnSlot(const Expr *E, RValue Src); |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 80 | |
John McCall | 7c2349b | 2011-08-25 20:40:09 +0000 | [diff] [blame] | 81 | AggValueSlot::NeedsGCBarriers_t needsGC(QualType T) { |
| 82 | if (CGF.getLangOptions().getGCMode() && TypeRequiresGCollection(T)) |
| 83 | return AggValueSlot::NeedsGCBarriers; |
| 84 | return AggValueSlot::DoesNotNeedGCBarriers; |
| 85 | } |
| 86 | |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 87 | bool TypeRequiresGCollection(QualType T); |
| 88 | |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 89 | //===--------------------------------------------------------------------===// |
| 90 | // Visitor Methods |
| 91 | //===--------------------------------------------------------------------===// |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 92 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 93 | void VisitStmt(Stmt *S) { |
Daniel Dunbar | 488e993 | 2008-08-16 00:56:44 +0000 | [diff] [blame] | 94 | CGF.ErrorUnsupported(S, "aggregate expression"); |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 95 | } |
| 96 | void VisitParenExpr(ParenExpr *PE) { Visit(PE->getSubExpr()); } |
Peter Collingbourne | f111d93 | 2011-04-15 00:35:48 +0000 | [diff] [blame] | 97 | void VisitGenericSelectionExpr(GenericSelectionExpr *GE) { |
| 98 | Visit(GE->getResultExpr()); |
| 99 | } |
Eli Friedman | 12444a2 | 2009-01-27 09:03:41 +0000 | [diff] [blame] | 100 | void VisitUnaryExtension(UnaryOperator *E) { Visit(E->getSubExpr()); } |
John McCall | 91a5755 | 2011-07-15 05:09:51 +0000 | [diff] [blame] | 101 | void VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *E) { |
| 102 | return Visit(E->getReplacement()); |
| 103 | } |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 104 | |
| 105 | // l-values. |
Seo Sanghyeon | 9b73b39 | 2007-12-14 02:04:12 +0000 | [diff] [blame] | 106 | void VisitDeclRefExpr(DeclRefExpr *DRE) { EmitAggLoadOfLValue(DRE); } |
| 107 | void VisitMemberExpr(MemberExpr *ME) { EmitAggLoadOfLValue(ME); } |
| 108 | void VisitUnaryDeref(UnaryOperator *E) { EmitAggLoadOfLValue(E); } |
Daniel Dunbar | 5be028f | 2010-01-04 18:47:06 +0000 | [diff] [blame] | 109 | void VisitStringLiteral(StringLiteral *E) { EmitAggLoadOfLValue(E); } |
Douglas Gregor | 751ec9b | 2011-06-17 04:59:12 +0000 | [diff] [blame] | 110 | void VisitCompoundLiteralExpr(CompoundLiteralExpr *E); |
Seo Sanghyeon | 9b73b39 | 2007-12-14 02:04:12 +0000 | [diff] [blame] | 111 | void VisitArraySubscriptExpr(ArraySubscriptExpr *E) { |
| 112 | EmitAggLoadOfLValue(E); |
| 113 | } |
Chris Lattner | f0a990c | 2009-04-21 23:00:09 +0000 | [diff] [blame] | 114 | void VisitBlockDeclRefExpr(const BlockDeclRefExpr *E) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 115 | EmitAggLoadOfLValue(E); |
Chris Lattner | f0a990c | 2009-04-21 23:00:09 +0000 | [diff] [blame] | 116 | } |
| 117 | void VisitPredefinedExpr(const PredefinedExpr *E) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 118 | EmitAggLoadOfLValue(E); |
Chris Lattner | f0a990c | 2009-04-21 23:00:09 +0000 | [diff] [blame] | 119 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 120 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 121 | // Operators. |
Anders Carlsson | 4d8673b | 2009-08-07 23:22:37 +0000 | [diff] [blame] | 122 | void VisitCastExpr(CastExpr *E); |
Anders Carlsson | 148fe67 | 2007-10-31 22:04:46 +0000 | [diff] [blame] | 123 | void VisitCallExpr(const CallExpr *E); |
Chris Lattner | b2d963f | 2007-08-31 22:54:14 +0000 | [diff] [blame] | 124 | void VisitStmtExpr(const StmtExpr *E); |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 125 | void VisitBinaryOperator(const BinaryOperator *BO); |
Fariborz Jahanian | 8bfd31f | 2009-10-22 22:57:31 +0000 | [diff] [blame] | 126 | void VisitPointerToDataMemberBinaryOperator(const BinaryOperator *BO); |
Chris Lattner | 03d6fb9 | 2007-08-21 04:43:17 +0000 | [diff] [blame] | 127 | void VisitBinAssign(const BinaryOperator *E); |
Eli Friedman | 07fa52a | 2008-05-20 07:56:31 +0000 | [diff] [blame] | 128 | void VisitBinComma(const BinaryOperator *E); |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 129 | |
Chris Lattner | 8fdf328 | 2008-06-24 17:04:18 +0000 | [diff] [blame] | 130 | void VisitObjCMessageExpr(ObjCMessageExpr *E); |
Daniel Dunbar | 0a04d77 | 2008-08-23 10:51:21 +0000 | [diff] [blame] | 131 | void VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) { |
| 132 | EmitAggLoadOfLValue(E); |
| 133 | } |
Daniel Dunbar | 9c3fc70 | 2008-08-27 06:57:25 +0000 | [diff] [blame] | 134 | void VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E); |
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 | |
Eli Friedman | b185124 | 2008-05-27 15:51:49 +0000 | [diff] [blame] | 151 | void VisitVAArgExpr(VAArgExpr *E); |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 152 | |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 153 | void EmitInitializationToLValue(Expr *E, LValue Address); |
| 154 | void EmitNullInitializationToLValue(LValue Address); |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 155 | // case Expr::ChooseExprClass: |
Mike Stump | 39406b1 | 2009-12-09 19:24:08 +0000 | [diff] [blame] | 156 | void VisitCXXThrowExpr(const CXXThrowExpr *E) { CGF.EmitCXXThrowExpr(E); } |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 157 | }; |
| 158 | } // end anonymous namespace. |
| 159 | |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 160 | //===----------------------------------------------------------------------===// |
| 161 | // Utilities |
| 162 | //===----------------------------------------------------------------------===// |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 163 | |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 164 | /// EmitAggLoadOfLValue - Given an expression with aggregate type that |
| 165 | /// represents a value lvalue, this method emits the address of the lvalue, |
| 166 | /// then loads the result into DestPtr. |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 167 | void AggExprEmitter::EmitAggLoadOfLValue(const Expr *E) { |
| 168 | LValue LV = CGF.EmitLValue(E); |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 169 | EmitFinalDestCopy(E, LV); |
| 170 | } |
| 171 | |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 172 | /// \brief True if the given aggregate type requires special GC API calls. |
| 173 | bool AggExprEmitter::TypeRequiresGCollection(QualType T) { |
| 174 | // Only record types have members that might require garbage collection. |
| 175 | const RecordType *RecordTy = T->getAs<RecordType>(); |
| 176 | if (!RecordTy) return false; |
| 177 | |
| 178 | // Don't mess with non-trivial C++ types. |
| 179 | RecordDecl *Record = RecordTy->getDecl(); |
| 180 | if (isa<CXXRecordDecl>(Record) && |
| 181 | (!cast<CXXRecordDecl>(Record)->hasTrivialCopyConstructor() || |
| 182 | !cast<CXXRecordDecl>(Record)->hasTrivialDestructor())) |
| 183 | return false; |
| 184 | |
| 185 | // Check whether the type has an object member. |
| 186 | return Record->hasObjectMember(); |
| 187 | } |
| 188 | |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame^] | 189 | /// \brief Perform the final move to DestPtr if for some reason |
| 190 | /// getReturnValueSlot() didn't use it directly. |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 191 | /// |
| 192 | /// The idea is that you do something like this: |
| 193 | /// RValue Result = EmitSomething(..., getReturnValueSlot()); |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame^] | 194 | /// EmitMoveFromReturnSlot(E, Result); |
| 195 | /// |
| 196 | /// If nothing interferes, this will cause the result to be emitted |
| 197 | /// directly into the return value slot. Otherwise, a final move |
| 198 | /// will be performed. |
| 199 | void AggExprEmitter::EmitMoveFromReturnSlot(const Expr *E, RValue Src) { |
| 200 | if (shouldUseDestForReturnSlot()) { |
| 201 | // Logically, Dest.getAddr() should equal Src.getAggregateAddr(). |
| 202 | // The possibility of undef rvalues complicates that a lot, |
| 203 | // though, so we can't really assert. |
| 204 | return; |
Fariborz Jahanian | 55bcace | 2010-06-15 22:44:06 +0000 | [diff] [blame] | 205 | } |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame^] | 206 | |
| 207 | // Otherwise, do a final copy, |
| 208 | assert(Dest.getAddr() != Src.getAggregateAddr()); |
| 209 | EmitFinalDestCopy(E, Src, /*Ignore*/ true); |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 210 | } |
| 211 | |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 212 | /// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. |
Mike Stump | 49d1cd5 | 2009-05-26 22:03:21 +0000 | [diff] [blame] | 213 | void AggExprEmitter::EmitFinalDestCopy(const Expr *E, RValue Src, bool Ignore) { |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 214 | assert(Src.isAggregate() && "value must be aggregate value!"); |
| 215 | |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 216 | // If Dest is ignored, then we're evaluating an aggregate expression |
John McCall | a8f28da | 2010-08-25 02:50:31 +0000 | [diff] [blame] | 217 | // in a context (like an expression statement) that doesn't care |
| 218 | // about the result. C says that an lvalue-to-rvalue conversion is |
| 219 | // performed in these cases; C++ says that it is not. In either |
| 220 | // case, we don't actually need to do anything unless the value is |
| 221 | // volatile. |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 222 | if (Dest.isIgnored()) { |
John McCall | a8f28da | 2010-08-25 02:50:31 +0000 | [diff] [blame] | 223 | if (!Src.isVolatileQualified() || |
| 224 | CGF.CGM.getLangOptions().CPlusPlus || |
| 225 | (IgnoreResult && Ignore)) |
Mike Stump | 9ccb103 | 2009-05-23 22:01:27 +0000 | [diff] [blame] | 226 | return; |
Fariborz Jahanian | 8a97005 | 2010-10-22 22:05:03 +0000 | [diff] [blame] | 227 | |
Mike Stump | 49d1cd5 | 2009-05-26 22:03:21 +0000 | [diff] [blame] | 228 | // If the source is volatile, we must read from it; to do that, we need |
| 229 | // some place to put it. |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 230 | Dest = CGF.CreateAggTemp(E->getType(), "agg.tmp"); |
Mike Stump | 9ccb103 | 2009-05-23 22:01:27 +0000 | [diff] [blame] | 231 | } |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 232 | |
John McCall | d1a5f13 | 2010-09-16 03:13:23 +0000 | [diff] [blame] | 233 | if (Dest.requiresGCollection()) { |
Ken Dyck | 479b61c | 2011-04-24 17:08:00 +0000 | [diff] [blame] | 234 | CharUnits size = CGF.getContext().getTypeSizeInChars(E->getType()); |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 235 | llvm::Type *SizeTy = CGF.ConvertType(CGF.getContext().getSizeType()); |
Ken Dyck | 479b61c | 2011-04-24 17:08:00 +0000 | [diff] [blame] | 236 | llvm::Value *SizeVal = llvm::ConstantInt::get(SizeTy, size.getQuantity()); |
Fariborz Jahanian | 08c3213 | 2009-08-31 19:33:16 +0000 | [diff] [blame] | 237 | CGF.CGM.getObjCRuntime().EmitGCMemmoveCollectable(CGF, |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 238 | Dest.getAddr(), |
| 239 | Src.getAggregateAddr(), |
| 240 | SizeVal); |
Fariborz Jahanian | 08c3213 | 2009-08-31 19:33:16 +0000 | [diff] [blame] | 241 | return; |
| 242 | } |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 243 | // If the result of the assignment is used, copy the LHS there also. |
| 244 | // FIXME: Pass VolatileDest as well. I think we also need to merge volatile |
| 245 | // from the source as well, as we can't eliminate it if either operand |
| 246 | // is volatile, unless copy has volatile for both source and destination.. |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 247 | CGF.EmitAggregateCopy(Dest.getAddr(), Src.getAggregateAddr(), E->getType(), |
| 248 | Dest.isVolatile()|Src.isVolatileQualified()); |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 249 | } |
| 250 | |
| 251 | /// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. |
Mike Stump | 49d1cd5 | 2009-05-26 22:03:21 +0000 | [diff] [blame] | 252 | void AggExprEmitter::EmitFinalDestCopy(const Expr *E, LValue Src, bool Ignore) { |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 253 | assert(Src.isSimple() && "Can't have aggregate bitfield, vector, etc"); |
| 254 | |
| 255 | EmitFinalDestCopy(E, RValue::getAggregate(Src.getAddress(), |
Mike Stump | 49d1cd5 | 2009-05-26 22:03:21 +0000 | [diff] [blame] | 256 | Src.isVolatileQualified()), |
| 257 | Ignore); |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 258 | } |
| 259 | |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 260 | //===----------------------------------------------------------------------===// |
| 261 | // Visitor Methods |
| 262 | //===----------------------------------------------------------------------===// |
| 263 | |
Douglas Gregor | 03e8003 | 2011-06-21 17:03:29 +0000 | [diff] [blame] | 264 | void AggExprEmitter::VisitMaterializeTemporaryExpr(MaterializeTemporaryExpr *E){ |
| 265 | Visit(E->GetTemporaryExpr()); |
| 266 | } |
| 267 | |
John McCall | e996ffd | 2011-02-16 08:02:54 +0000 | [diff] [blame] | 268 | void AggExprEmitter::VisitOpaqueValueExpr(OpaqueValueExpr *e) { |
John McCall | 56ca35d | 2011-02-17 10:25:35 +0000 | [diff] [blame] | 269 | EmitFinalDestCopy(e, CGF.getOpaqueLValueMapping(e)); |
John McCall | e996ffd | 2011-02-16 08:02:54 +0000 | [diff] [blame] | 270 | } |
| 271 | |
Douglas Gregor | 751ec9b | 2011-06-17 04:59:12 +0000 | [diff] [blame] | 272 | void |
| 273 | AggExprEmitter::VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { |
Douglas Gregor | 673e98b | 2011-06-17 16:37:20 +0000 | [diff] [blame] | 274 | if (E->getType().isPODType(CGF.getContext())) { |
| 275 | // For a POD type, just emit a load of the lvalue + a copy, because our |
| 276 | // compound literal might alias the destination. |
| 277 | // FIXME: This is a band-aid; the real problem appears to be in our handling |
| 278 | // of assignments, where we store directly into the LHS without checking |
| 279 | // whether anything in the RHS aliases. |
| 280 | EmitAggLoadOfLValue(E); |
| 281 | return; |
| 282 | } |
| 283 | |
Douglas Gregor | 751ec9b | 2011-06-17 04:59:12 +0000 | [diff] [blame] | 284 | AggValueSlot Slot = EnsureSlot(E->getType()); |
| 285 | CGF.EmitAggExpr(E->getInitializer(), Slot); |
| 286 | } |
| 287 | |
| 288 | |
Anders Carlsson | 4d8673b | 2009-08-07 23:22:37 +0000 | [diff] [blame] | 289 | void AggExprEmitter::VisitCastExpr(CastExpr *E) { |
Anders Carlsson | 3016842 | 2009-09-29 01:23:39 +0000 | [diff] [blame] | 290 | switch (E->getCastKind()) { |
Anders Carlsson | 575b374 | 2011-04-11 02:03:26 +0000 | [diff] [blame] | 291 | case CK_Dynamic: { |
Douglas Gregor | 69cfeb1 | 2010-05-14 21:31:02 +0000 | [diff] [blame] | 292 | assert(isa<CXXDynamicCastExpr>(E) && "CK_Dynamic without a dynamic_cast?"); |
| 293 | LValue LV = CGF.EmitCheckedLValue(E->getSubExpr()); |
| 294 | // FIXME: Do we also need to handle property references here? |
| 295 | if (LV.isSimple()) |
| 296 | CGF.EmitDynamicCast(LV.getAddress(), cast<CXXDynamicCastExpr>(E)); |
| 297 | else |
| 298 | CGF.CGM.ErrorUnsupported(E, "non-simple lvalue dynamic_cast"); |
| 299 | |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 300 | if (!Dest.isIgnored()) |
| 301 | CGF.CGM.ErrorUnsupported(E, "lvalue dynamic_cast with a destination"); |
Douglas Gregor | 69cfeb1 | 2010-05-14 21:31:02 +0000 | [diff] [blame] | 302 | break; |
| 303 | } |
| 304 | |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 305 | case CK_ToUnion: { |
John McCall | 6591271 | 2011-04-12 22:02:02 +0000 | [diff] [blame] | 306 | if (Dest.isIgnored()) break; |
| 307 | |
Anders Carlsson | 4d8673b | 2009-08-07 23:22:37 +0000 | [diff] [blame] | 308 | // GCC union extension |
Daniel Dunbar | 79c3928 | 2010-08-21 03:15:20 +0000 | [diff] [blame] | 309 | QualType Ty = E->getSubExpr()->getType(); |
| 310 | QualType PtrTy = CGF.getContext().getPointerType(Ty); |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 311 | llvm::Value *CastPtr = Builder.CreateBitCast(Dest.getAddr(), |
Eli Friedman | 34ebf4d | 2009-06-03 20:45:06 +0000 | [diff] [blame] | 312 | CGF.ConvertType(PtrTy)); |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 313 | EmitInitializationToLValue(E->getSubExpr(), |
| 314 | CGF.MakeAddrLValue(CastPtr, Ty)); |
Anders Carlsson | 3016842 | 2009-09-29 01:23:39 +0000 | [diff] [blame] | 315 | break; |
Nuno Lopes | 7e91627 | 2009-01-15 20:14:33 +0000 | [diff] [blame] | 316 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 317 | |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 318 | case CK_DerivedToBase: |
| 319 | case CK_BaseToDerived: |
| 320 | case CK_UncheckedDerivedToBase: { |
Douglas Gregor | 2d6b0e9 | 2010-05-22 05:17:18 +0000 | [diff] [blame] | 321 | assert(0 && "cannot perform hierarchy conversion in EmitAggExpr: " |
| 322 | "should have been unpacked before we got here"); |
| 323 | break; |
| 324 | } |
| 325 | |
John McCall | f6a1648 | 2010-12-04 03:47:34 +0000 | [diff] [blame] | 326 | case CK_GetObjCProperty: { |
| 327 | LValue LV = CGF.EmitLValue(E->getSubExpr()); |
| 328 | assert(LV.isPropertyRef()); |
| 329 | RValue RV = CGF.EmitLoadOfPropertyRefLValue(LV, getReturnValueSlot()); |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame^] | 330 | EmitMoveFromReturnSlot(E, RV); |
John McCall | f6a1648 | 2010-12-04 03:47:34 +0000 | [diff] [blame] | 331 | break; |
| 332 | } |
| 333 | |
| 334 | case CK_LValueToRValue: // hope for downstream optimization |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 335 | case CK_NoOp: |
| 336 | case CK_UserDefinedConversion: |
| 337 | case CK_ConstructorConversion: |
Anders Carlsson | 3016842 | 2009-09-29 01:23:39 +0000 | [diff] [blame] | 338 | assert(CGF.getContext().hasSameUnqualifiedType(E->getSubExpr()->getType(), |
| 339 | E->getType()) && |
| 340 | "Implicit cast types must be compatible"); |
| 341 | Visit(E->getSubExpr()); |
| 342 | break; |
John McCall | 0ae287a | 2010-12-01 04:43:34 +0000 | [diff] [blame] | 343 | |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 344 | case CK_LValueBitCast: |
John McCall | 0ae287a | 2010-12-01 04:43:34 +0000 | [diff] [blame] | 345 | llvm_unreachable("should not be emitting lvalue bitcast as rvalue"); |
Douglas Gregor | e39a389 | 2010-07-13 23:17:26 +0000 | [diff] [blame] | 346 | break; |
John McCall | 1de4d4e | 2011-04-07 08:22:57 +0000 | [diff] [blame] | 347 | |
John McCall | 0ae287a | 2010-12-01 04:43:34 +0000 | [diff] [blame] | 348 | case CK_Dependent: |
| 349 | case CK_BitCast: |
| 350 | case CK_ArrayToPointerDecay: |
| 351 | case CK_FunctionToPointerDecay: |
| 352 | case CK_NullToPointer: |
| 353 | case CK_NullToMemberPointer: |
| 354 | case CK_BaseToDerivedMemberPointer: |
| 355 | case CK_DerivedToBaseMemberPointer: |
| 356 | case CK_MemberPointerToBoolean: |
| 357 | case CK_IntegralToPointer: |
| 358 | case CK_PointerToIntegral: |
| 359 | case CK_PointerToBoolean: |
| 360 | case CK_ToVoid: |
| 361 | case CK_VectorSplat: |
| 362 | case CK_IntegralCast: |
| 363 | case CK_IntegralToBoolean: |
| 364 | case CK_IntegralToFloating: |
| 365 | case CK_FloatingToIntegral: |
| 366 | case CK_FloatingToBoolean: |
| 367 | case CK_FloatingCast: |
| 368 | case CK_AnyPointerToObjCPointerCast: |
| 369 | case CK_AnyPointerToBlockPointerCast: |
| 370 | case CK_ObjCObjectLValueCast: |
| 371 | case CK_FloatingRealToComplex: |
| 372 | case CK_FloatingComplexToReal: |
| 373 | case CK_FloatingComplexToBoolean: |
| 374 | case CK_FloatingComplexCast: |
| 375 | case CK_FloatingComplexToIntegralComplex: |
| 376 | case CK_IntegralRealToComplex: |
| 377 | case CK_IntegralComplexToReal: |
| 378 | case CK_IntegralComplexToBoolean: |
| 379 | case CK_IntegralComplexCast: |
| 380 | case CK_IntegralComplexToFloatingComplex: |
John McCall | f85e193 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 381 | case CK_ObjCProduceObject: |
| 382 | case CK_ObjCConsumeObject: |
John McCall | 7e5e5f4 | 2011-07-07 06:58:02 +0000 | [diff] [blame] | 383 | case CK_ObjCReclaimReturnedObject: |
John McCall | 0ae287a | 2010-12-01 04:43:34 +0000 | [diff] [blame] | 384 | llvm_unreachable("cast kind invalid for aggregate types"); |
Anders Carlsson | 3016842 | 2009-09-29 01:23:39 +0000 | [diff] [blame] | 385 | } |
Anders Carlsson | e4707ff | 2008-01-14 06:28:57 +0000 | [diff] [blame] | 386 | } |
| 387 | |
Chris Lattner | 9619662 | 2008-07-26 22:37:01 +0000 | [diff] [blame] | 388 | void AggExprEmitter::VisitCallExpr(const CallExpr *E) { |
Anders Carlsson | e70e8f7 | 2009-05-27 16:45:02 +0000 | [diff] [blame] | 389 | if (E->getCallReturnType()->isReferenceType()) { |
| 390 | EmitAggLoadOfLValue(E); |
| 391 | return; |
| 392 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 393 | |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 394 | RValue RV = CGF.EmitCallExpr(E, getReturnValueSlot()); |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame^] | 395 | EmitMoveFromReturnSlot(E, RV); |
Anders Carlsson | 148fe67 | 2007-10-31 22:04:46 +0000 | [diff] [blame] | 396 | } |
Chris Lattner | 9619662 | 2008-07-26 22:37:01 +0000 | [diff] [blame] | 397 | |
| 398 | void AggExprEmitter::VisitObjCMessageExpr(ObjCMessageExpr *E) { |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 399 | RValue RV = CGF.EmitObjCMessageExpr(E, getReturnValueSlot()); |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame^] | 400 | EmitMoveFromReturnSlot(E, RV); |
Chris Lattner | 8fdf328 | 2008-06-24 17:04:18 +0000 | [diff] [blame] | 401 | } |
Anders Carlsson | 148fe67 | 2007-10-31 22:04:46 +0000 | [diff] [blame] | 402 | |
Daniel Dunbar | 9c3fc70 | 2008-08-27 06:57:25 +0000 | [diff] [blame] | 403 | void AggExprEmitter::VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E) { |
John McCall | f6a1648 | 2010-12-04 03:47:34 +0000 | [diff] [blame] | 404 | llvm_unreachable("direct property access not surrounded by " |
| 405 | "lvalue-to-rvalue cast"); |
Daniel Dunbar | 9c3fc70 | 2008-08-27 06:57:25 +0000 | [diff] [blame] | 406 | } |
| 407 | |
Chris Lattner | 9619662 | 2008-07-26 22:37:01 +0000 | [diff] [blame] | 408 | void AggExprEmitter::VisitBinComma(const BinaryOperator *E) { |
John McCall | 2a41637 | 2010-12-05 02:00:02 +0000 | [diff] [blame] | 409 | CGF.EmitIgnoredExpr(E->getLHS()); |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 410 | Visit(E->getRHS()); |
Eli Friedman | 07fa52a | 2008-05-20 07:56:31 +0000 | [diff] [blame] | 411 | } |
| 412 | |
Chris Lattner | b2d963f | 2007-08-31 22:54:14 +0000 | [diff] [blame] | 413 | void AggExprEmitter::VisitStmtExpr(const StmtExpr *E) { |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 414 | CodeGenFunction::StmtExprEvaluation eval(CGF); |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 415 | CGF.EmitCompoundStmt(*E->getSubStmt(), true, Dest); |
Chris Lattner | b2d963f | 2007-08-31 22:54:14 +0000 | [diff] [blame] | 416 | } |
| 417 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 418 | void AggExprEmitter::VisitBinaryOperator(const BinaryOperator *E) { |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 419 | if (E->getOpcode() == BO_PtrMemD || E->getOpcode() == BO_PtrMemI) |
Fariborz Jahanian | 8bfd31f | 2009-10-22 22:57:31 +0000 | [diff] [blame] | 420 | VisitPointerToDataMemberBinaryOperator(E); |
| 421 | else |
| 422 | CGF.ErrorUnsupported(E, "aggregate binary expression"); |
| 423 | } |
| 424 | |
| 425 | void AggExprEmitter::VisitPointerToDataMemberBinaryOperator( |
| 426 | const BinaryOperator *E) { |
| 427 | LValue LV = CGF.EmitPointerToDataMemberBinaryExpr(E); |
| 428 | EmitFinalDestCopy(E, LV); |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 429 | } |
| 430 | |
Chris Lattner | 03d6fb9 | 2007-08-21 04:43:17 +0000 | [diff] [blame] | 431 | void AggExprEmitter::VisitBinAssign(const BinaryOperator *E) { |
Eli Friedman | ff6e2b7 | 2008-02-11 01:09:17 +0000 | [diff] [blame] | 432 | // For an assignment to work, the value on the right has |
| 433 | // to be compatible with the value on the left. |
Eli Friedman | 2dce5f8 | 2009-05-28 23:04:00 +0000 | [diff] [blame] | 434 | assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(), |
| 435 | E->getRHS()->getType()) |
Eli Friedman | ff6e2b7 | 2008-02-11 01:09:17 +0000 | [diff] [blame] | 436 | && "Invalid assignment"); |
John McCall | cd940a1 | 2010-12-06 06:10:02 +0000 | [diff] [blame] | 437 | |
Fariborz Jahanian | 2c7168c | 2011-04-29 21:53:21 +0000 | [diff] [blame] | 438 | if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->getLHS())) |
Fariborz Jahanian | 73a6f8e | 2011-04-29 22:11:28 +0000 | [diff] [blame] | 439 | if (const VarDecl *VD = dyn_cast<VarDecl>(DRE->getDecl())) |
Fariborz Jahanian | 2c7168c | 2011-04-29 21:53:21 +0000 | [diff] [blame] | 440 | if (VD->hasAttr<BlocksAttr>() && |
| 441 | E->getRHS()->HasSideEffects(CGF.getContext())) { |
| 442 | // When __block variable on LHS, the RHS must be evaluated first |
| 443 | // as it may change the 'forwarding' field via call to Block_copy. |
| 444 | LValue RHS = CGF.EmitLValue(E->getRHS()); |
| 445 | LValue LHS = CGF.EmitLValue(E->getLHS()); |
John McCall | 7c2349b | 2011-08-25 20:40:09 +0000 | [diff] [blame] | 446 | Dest = AggValueSlot::forLValue(LHS, AggValueSlot::IsDestructed, |
| 447 | needsGC(E->getLHS()->getType())); |
Fariborz Jahanian | 2c7168c | 2011-04-29 21:53:21 +0000 | [diff] [blame] | 448 | EmitFinalDestCopy(E, RHS, true); |
| 449 | return; |
| 450 | } |
Fariborz Jahanian | 2c7168c | 2011-04-29 21:53:21 +0000 | [diff] [blame] | 451 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 452 | LValue LHS = CGF.EmitLValue(E->getLHS()); |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 453 | |
Daniel Dunbar | 7f8ea5c | 2008-08-30 05:35:15 +0000 | [diff] [blame] | 454 | // We have to special case property setters, otherwise we must have |
| 455 | // a simple lvalue (no aggregates inside vectors, bitfields). |
| 456 | if (LHS.isPropertyRef()) { |
Fariborz Jahanian | 68af13f | 2011-03-30 16:11:20 +0000 | [diff] [blame] | 457 | const ObjCPropertyRefExpr *RE = LHS.getPropertyRefExpr(); |
| 458 | QualType ArgType = RE->getSetterArgType(); |
| 459 | RValue Src; |
| 460 | if (ArgType->isReferenceType()) |
| 461 | Src = CGF.EmitReferenceBindingToExpr(E->getRHS(), 0); |
| 462 | else { |
| 463 | AggValueSlot Slot = EnsureSlot(E->getRHS()->getType()); |
| 464 | CGF.EmitAggExpr(E->getRHS(), Slot); |
| 465 | Src = Slot.asRValue(); |
| 466 | } |
| 467 | CGF.EmitStoreThroughPropertyRefLValue(Src, LHS); |
Daniel Dunbar | 7f8ea5c | 2008-08-30 05:35:15 +0000 | [diff] [blame] | 468 | } else { |
| 469 | // Codegen the RHS so that it stores directly into the LHS. |
John McCall | 7c2349b | 2011-08-25 20:40:09 +0000 | [diff] [blame] | 470 | AggValueSlot LHSSlot = |
| 471 | AggValueSlot::forLValue(LHS, AggValueSlot::IsDestructed, |
| 472 | needsGC(E->getLHS()->getType())); |
Fariborz Jahanian | 474e2fe | 2010-09-16 00:20:07 +0000 | [diff] [blame] | 473 | CGF.EmitAggExpr(E->getRHS(), LHSSlot, false); |
Mike Stump | 49d1cd5 | 2009-05-26 22:03:21 +0000 | [diff] [blame] | 474 | EmitFinalDestCopy(E, LHS, true); |
Daniel Dunbar | 7f8ea5c | 2008-08-30 05:35:15 +0000 | [diff] [blame] | 475 | } |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 476 | } |
| 477 | |
John McCall | 56ca35d | 2011-02-17 10:25:35 +0000 | [diff] [blame] | 478 | void AggExprEmitter:: |
| 479 | VisitAbstractConditionalOperator(const AbstractConditionalOperator *E) { |
Daniel Dunbar | 9615ecb | 2008-11-13 01:38:36 +0000 | [diff] [blame] | 480 | llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true"); |
| 481 | llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false"); |
| 482 | llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 483 | |
John McCall | 56ca35d | 2011-02-17 10:25:35 +0000 | [diff] [blame] | 484 | // Bind the common expression if necessary. |
| 485 | CodeGenFunction::OpaqueValueMapping binding(CGF, E); |
| 486 | |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 487 | CodeGenFunction::ConditionalEvaluation eval(CGF); |
Eli Friedman | 8e274bd | 2009-12-25 06:17:05 +0000 | [diff] [blame] | 488 | CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 489 | |
John McCall | 74fb0ed | 2010-11-17 00:07:33 +0000 | [diff] [blame] | 490 | // Save whether the destination's lifetime is externally managed. |
| 491 | bool DestLifetimeManaged = Dest.isLifetimeExternallyManaged(); |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 492 | |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 493 | eval.begin(CGF); |
| 494 | CGF.EmitBlock(LHSBlock); |
John McCall | 56ca35d | 2011-02-17 10:25:35 +0000 | [diff] [blame] | 495 | Visit(E->getTrueExpr()); |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 496 | eval.end(CGF); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 497 | |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 498 | assert(CGF.HaveInsertPoint() && "expression evaluation ended with no IP!"); |
| 499 | CGF.Builder.CreateBr(ContBlock); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 500 | |
John McCall | 74fb0ed | 2010-11-17 00:07:33 +0000 | [diff] [blame] | 501 | // If the result of an agg expression is unused, then the emission |
| 502 | // of the LHS might need to create a destination slot. That's fine |
| 503 | // with us, and we can safely emit the RHS into the same slot, but |
| 504 | // we shouldn't claim that its lifetime is externally managed. |
| 505 | Dest.setLifetimeExternallyManaged(DestLifetimeManaged); |
| 506 | |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 507 | eval.begin(CGF); |
| 508 | CGF.EmitBlock(RHSBlock); |
John McCall | 56ca35d | 2011-02-17 10:25:35 +0000 | [diff] [blame] | 509 | Visit(E->getFalseExpr()); |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 510 | eval.end(CGF); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 511 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 512 | CGF.EmitBlock(ContBlock); |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 513 | } |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 514 | |
Anders Carlsson | a294ca8 | 2009-07-08 18:33:14 +0000 | [diff] [blame] | 515 | void AggExprEmitter::VisitChooseExpr(const ChooseExpr *CE) { |
| 516 | Visit(CE->getChosenSubExpr(CGF.getContext())); |
| 517 | } |
| 518 | |
Eli Friedman | b185124 | 2008-05-27 15:51:49 +0000 | [diff] [blame] | 519 | void AggExprEmitter::VisitVAArgExpr(VAArgExpr *VE) { |
Daniel Dunbar | 0785570 | 2009-02-11 22:25:55 +0000 | [diff] [blame] | 520 | llvm::Value *ArgValue = CGF.EmitVAListRef(VE->getSubExpr()); |
Anders Carlsson | ddf7cac | 2008-11-04 05:30:00 +0000 | [diff] [blame] | 521 | llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, VE->getType()); |
| 522 | |
Sebastian Redl | 0262f02 | 2009-01-09 21:09:38 +0000 | [diff] [blame] | 523 | if (!ArgPtr) { |
Anders Carlsson | ddf7cac | 2008-11-04 05:30:00 +0000 | [diff] [blame] | 524 | CGF.ErrorUnsupported(VE, "aggregate va_arg expression"); |
Sebastian Redl | 0262f02 | 2009-01-09 21:09:38 +0000 | [diff] [blame] | 525 | return; |
| 526 | } |
| 527 | |
Daniel Dunbar | 79c3928 | 2010-08-21 03:15:20 +0000 | [diff] [blame] | 528 | EmitFinalDestCopy(VE, CGF.MakeAddrLValue(ArgPtr, VE->getType())); |
Eli Friedman | b185124 | 2008-05-27 15:51:49 +0000 | [diff] [blame] | 529 | } |
| 530 | |
Anders Carlsson | b58d017 | 2009-05-30 23:23:33 +0000 | [diff] [blame] | 531 | void AggExprEmitter::VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) { |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 532 | // Ensure that we have a slot, but if we already do, remember |
| 533 | // whether its lifetime was externally managed. |
| 534 | bool WasManaged = Dest.isLifetimeExternallyManaged(); |
| 535 | Dest = EnsureSlot(E->getType()); |
| 536 | Dest.setLifetimeExternallyManaged(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 537 | |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 538 | Visit(E->getSubExpr()); |
Anders Carlsson | b58d017 | 2009-05-30 23:23:33 +0000 | [diff] [blame] | 539 | |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 540 | // Set up the temporary's destructor if its lifetime wasn't already |
| 541 | // being managed. |
| 542 | if (!WasManaged) |
| 543 | CGF.EmitCXXTemporary(E->getTemporary(), Dest.getAddr()); |
Anders Carlsson | b58d017 | 2009-05-30 23:23:33 +0000 | [diff] [blame] | 544 | } |
| 545 | |
Anders Carlsson | b14095a | 2009-04-17 00:06:03 +0000 | [diff] [blame] | 546 | void |
Anders Carlsson | 31ccf37 | 2009-05-03 17:47:16 +0000 | [diff] [blame] | 547 | AggExprEmitter::VisitCXXConstructExpr(const CXXConstructExpr *E) { |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 548 | AggValueSlot Slot = EnsureSlot(E->getType()); |
| 549 | CGF.EmitCXXConstructExpr(E, Slot); |
Anders Carlsson | 7f6ad15 | 2009-05-19 04:48:36 +0000 | [diff] [blame] | 550 | } |
| 551 | |
John McCall | 4765fa0 | 2010-12-06 08:20:24 +0000 | [diff] [blame] | 552 | void AggExprEmitter::VisitExprWithCleanups(ExprWithCleanups *E) { |
| 553 | CGF.EmitExprWithCleanups(E, Dest); |
Anders Carlsson | b14095a | 2009-04-17 00:06:03 +0000 | [diff] [blame] | 554 | } |
| 555 | |
Douglas Gregor | ed8abf1 | 2010-07-08 06:14:04 +0000 | [diff] [blame] | 556 | void AggExprEmitter::VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E) { |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 557 | QualType T = E->getType(); |
| 558 | AggValueSlot Slot = EnsureSlot(T); |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 559 | EmitNullInitializationToLValue(CGF.MakeAddrLValue(Slot.getAddr(), T)); |
Anders Carlsson | 30311fa | 2009-12-16 06:57:54 +0000 | [diff] [blame] | 560 | } |
| 561 | |
| 562 | void AggExprEmitter::VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) { |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 563 | QualType T = E->getType(); |
| 564 | AggValueSlot Slot = EnsureSlot(T); |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 565 | EmitNullInitializationToLValue(CGF.MakeAddrLValue(Slot.getAddr(), T)); |
Nuno Lopes | 329763b | 2009-10-18 15:18:11 +0000 | [diff] [blame] | 566 | } |
| 567 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 568 | /// isSimpleZero - If emitting this value will obviously just cause a store of |
| 569 | /// zero to memory, return true. This can return false if uncertain, so it just |
| 570 | /// handles simple cases. |
| 571 | static bool isSimpleZero(const Expr *E, CodeGenFunction &CGF) { |
Peter Collingbourne | f111d93 | 2011-04-15 00:35:48 +0000 | [diff] [blame] | 572 | E = E->IgnoreParens(); |
| 573 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 574 | // 0 |
| 575 | if (const IntegerLiteral *IL = dyn_cast<IntegerLiteral>(E)) |
| 576 | return IL->getValue() == 0; |
| 577 | // +0.0 |
| 578 | if (const FloatingLiteral *FL = dyn_cast<FloatingLiteral>(E)) |
| 579 | return FL->getValue().isPosZero(); |
| 580 | // int() |
| 581 | if ((isa<ImplicitValueInitExpr>(E) || isa<CXXScalarValueInitExpr>(E)) && |
| 582 | CGF.getTypes().isZeroInitializable(E->getType())) |
| 583 | return true; |
| 584 | // (int*)0 - Null pointer expressions. |
| 585 | if (const CastExpr *ICE = dyn_cast<CastExpr>(E)) |
| 586 | return ICE->getCastKind() == CK_NullToPointer; |
| 587 | // '\0' |
| 588 | if (const CharacterLiteral *CL = dyn_cast<CharacterLiteral>(E)) |
| 589 | return CL->getValue() == 0; |
| 590 | |
| 591 | // Otherwise, hard case: conservatively return false. |
| 592 | return false; |
| 593 | } |
| 594 | |
| 595 | |
Anders Carlsson | 78e83f8 | 2010-02-03 17:33:16 +0000 | [diff] [blame] | 596 | void |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 597 | AggExprEmitter::EmitInitializationToLValue(Expr* E, LValue LV) { |
| 598 | QualType type = LV.getType(); |
Mike Stump | 7f79f9b | 2009-05-29 15:46:01 +0000 | [diff] [blame] | 599 | // FIXME: Ignore result? |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 600 | // FIXME: Are initializers affected by volatile? |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 601 | if (Dest.isZeroed() && isSimpleZero(E, CGF)) { |
| 602 | // Storing "i32 0" to a zero'd memory location is a noop. |
| 603 | } else if (isa<ImplicitValueInitExpr>(E)) { |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 604 | EmitNullInitializationToLValue(LV); |
| 605 | } else if (type->isReferenceType()) { |
Anders Carlsson | 32f36ba | 2010-06-26 16:35:32 +0000 | [diff] [blame] | 606 | RValue RV = CGF.EmitReferenceBindingToExpr(E, /*InitializedDecl=*/0); |
John McCall | 545d996 | 2011-06-25 02:11:03 +0000 | [diff] [blame] | 607 | CGF.EmitStoreThroughLValue(RV, LV); |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 608 | } else if (type->isAnyComplexType()) { |
Douglas Gregor | 3498bdb | 2009-01-29 17:44:32 +0000 | [diff] [blame] | 609 | CGF.EmitComplexExprIntoAddr(E, LV.getAddress(), false); |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 610 | } else if (CGF.hasAggregateLLVMType(type)) { |
John McCall | 7c2349b | 2011-08-25 20:40:09 +0000 | [diff] [blame] | 611 | CGF.EmitAggExpr(E, AggValueSlot::forLValue(LV, |
| 612 | AggValueSlot::IsDestructed, |
| 613 | AggValueSlot::DoesNotNeedGCBarriers, |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame^] | 614 | AggValueSlot::IsNotAliased, |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 615 | Dest.isZeroed())); |
John McCall | f85e193 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 616 | } else if (LV.isSimple()) { |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 617 | CGF.EmitScalarInit(E, /*D=*/0, LV, /*Captured=*/false); |
Eli Friedman | c8ba961 | 2008-05-12 15:06:05 +0000 | [diff] [blame] | 618 | } else { |
John McCall | 545d996 | 2011-06-25 02:11:03 +0000 | [diff] [blame] | 619 | CGF.EmitStoreThroughLValue(RValue::get(CGF.EmitScalarExpr(E)), LV); |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 620 | } |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 621 | } |
| 622 | |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 623 | void AggExprEmitter::EmitNullInitializationToLValue(LValue lv) { |
| 624 | QualType type = lv.getType(); |
| 625 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 626 | // If the destination slot is already zeroed out before the aggregate is |
| 627 | // copied into it, we don't have to emit any zeros here. |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 628 | if (Dest.isZeroed() && CGF.getTypes().isZeroInitializable(type)) |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 629 | return; |
| 630 | |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 631 | if (!CGF.hasAggregateLLVMType(type)) { |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 632 | // For non-aggregates, we can store zero |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 633 | llvm::Value *null = llvm::Constant::getNullValue(CGF.ConvertType(type)); |
John McCall | 545d996 | 2011-06-25 02:11:03 +0000 | [diff] [blame] | 634 | CGF.EmitStoreThroughLValue(RValue::get(null), lv); |
Lauro Ramos Venancio | 145cd89 | 2008-02-19 19:27:31 +0000 | [diff] [blame] | 635 | } else { |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 636 | // There's a potential optimization opportunity in combining |
| 637 | // memsets; that would be easy for arrays, but relatively |
| 638 | // difficult for structures with the current code. |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 639 | CGF.EmitNullInitialization(lv.getAddress(), lv.getType()); |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 640 | } |
| 641 | } |
| 642 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 643 | void AggExprEmitter::VisitInitListExpr(InitListExpr *E) { |
Eli Friedman | a385b3c | 2008-12-02 01:17:45 +0000 | [diff] [blame] | 644 | #if 0 |
Eli Friedman | 13a5be1 | 2009-12-04 01:30:56 +0000 | [diff] [blame] | 645 | // FIXME: Assess perf here? Figure out what cases are worth optimizing here |
| 646 | // (Length of globals? Chunks of zeroed-out space?). |
Eli Friedman | a385b3c | 2008-12-02 01:17:45 +0000 | [diff] [blame] | 647 | // |
Mike Stump | f5408fe | 2009-05-16 07:57:57 +0000 | [diff] [blame] | 648 | // If we can, prefer a copy from a global; this is a lot less code for long |
| 649 | // globals, and it's easier for the current optimizers to analyze. |
Eli Friedman | 13a5be1 | 2009-12-04 01:30:56 +0000 | [diff] [blame] | 650 | if (llvm::Constant* C = CGF.CGM.EmitConstantExpr(E, E->getType(), &CGF)) { |
Eli Friedman | 994ffef | 2008-11-30 02:11:09 +0000 | [diff] [blame] | 651 | llvm::GlobalVariable* GV = |
Eli Friedman | 13a5be1 | 2009-12-04 01:30:56 +0000 | [diff] [blame] | 652 | new llvm::GlobalVariable(CGF.CGM.getModule(), C->getType(), true, |
| 653 | llvm::GlobalValue::InternalLinkage, C, ""); |
Daniel Dunbar | 79c3928 | 2010-08-21 03:15:20 +0000 | [diff] [blame] | 654 | EmitFinalDestCopy(E, CGF.MakeAddrLValue(GV, E->getType())); |
Eli Friedman | 994ffef | 2008-11-30 02:11:09 +0000 | [diff] [blame] | 655 | return; |
| 656 | } |
Eli Friedman | a385b3c | 2008-12-02 01:17:45 +0000 | [diff] [blame] | 657 | #endif |
Chris Lattner | d0db03a | 2010-09-06 00:11:41 +0000 | [diff] [blame] | 658 | if (E->hadArrayRangeDesignator()) |
Douglas Gregor | a9c8780 | 2009-01-29 19:42:23 +0000 | [diff] [blame] | 659 | CGF.ErrorUnsupported(E, "GNU array range designator extension"); |
Douglas Gregor | a9c8780 | 2009-01-29 19:42:23 +0000 | [diff] [blame] | 660 | |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 661 | llvm::Value *DestPtr = Dest.getAddr(); |
| 662 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 663 | // Handle initialization of an array. |
| 664 | if (E->getType()->isArrayType()) { |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 665 | llvm::PointerType *APType = |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 666 | cast<llvm::PointerType>(DestPtr->getType()); |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 667 | llvm::ArrayType *AType = |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 668 | cast<llvm::ArrayType>(APType->getElementType()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 669 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 670 | uint64_t NumInitElements = E->getNumInits(); |
Eli Friedman | 922696f | 2008-05-19 17:51:16 +0000 | [diff] [blame] | 671 | |
Chris Lattner | 9619662 | 2008-07-26 22:37:01 +0000 | [diff] [blame] | 672 | if (E->getNumInits() > 0) { |
| 673 | QualType T1 = E->getType(); |
| 674 | QualType T2 = E->getInit(0)->getType(); |
Eli Friedman | 2dce5f8 | 2009-05-28 23:04:00 +0000 | [diff] [blame] | 675 | if (CGF.getContext().hasSameUnqualifiedType(T1, T2)) { |
Chris Lattner | 9619662 | 2008-07-26 22:37:01 +0000 | [diff] [blame] | 676 | EmitAggLoadOfLValue(E->getInit(0)); |
| 677 | return; |
| 678 | } |
Eli Friedman | 922696f | 2008-05-19 17:51:16 +0000 | [diff] [blame] | 679 | } |
| 680 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 681 | uint64_t NumArrayElements = AType->getNumElements(); |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 682 | assert(NumInitElements <= NumArrayElements); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 683 | |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 684 | QualType elementType = E->getType().getCanonicalType(); |
| 685 | elementType = CGF.getContext().getQualifiedType( |
| 686 | cast<ArrayType>(elementType)->getElementType(), |
| 687 | elementType.getQualifiers() + Dest.getQualifiers()); |
Argyrios Kyrtzidis | 3b4d490 | 2011-04-28 18:53:58 +0000 | [diff] [blame] | 688 | |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 689 | // DestPtr is an array*. Construct an elementType* by drilling |
| 690 | // down a level. |
| 691 | llvm::Value *zero = llvm::ConstantInt::get(CGF.SizeTy, 0); |
| 692 | llvm::Value *indices[] = { zero, zero }; |
| 693 | llvm::Value *begin = |
Jay Foad | 0f6ac7c | 2011-07-22 08:16:57 +0000 | [diff] [blame] | 694 | Builder.CreateInBoundsGEP(DestPtr, indices, "arrayinit.begin"); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 695 | |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 696 | // Exception safety requires us to destroy all the |
| 697 | // already-constructed members if an initializer throws. |
| 698 | // For that, we'll need an EH cleanup. |
| 699 | QualType::DestructionKind dtorKind = elementType.isDestructedType(); |
| 700 | llvm::AllocaInst *endOfInit = 0; |
| 701 | EHScopeStack::stable_iterator cleanup; |
| 702 | if (CGF.needsEHCleanup(dtorKind)) { |
| 703 | // In principle we could tell the cleanup where we are more |
| 704 | // directly, but the control flow can get so varied here that it |
| 705 | // would actually be quite complex. Therefore we go through an |
| 706 | // alloca. |
| 707 | endOfInit = CGF.CreateTempAlloca(begin->getType(), |
| 708 | "arrayinit.endOfInit"); |
| 709 | Builder.CreateStore(begin, endOfInit); |
John McCall | 2673c68 | 2011-07-11 08:38:19 +0000 | [diff] [blame] | 710 | CGF.pushIrregularPartialArrayCleanup(begin, endOfInit, elementType, |
| 711 | CGF.getDestroyer(dtorKind)); |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 712 | cleanup = CGF.EHStack.stable_begin(); |
| 713 | |
| 714 | // Otherwise, remember that we didn't need a cleanup. |
| 715 | } else { |
| 716 | dtorKind = QualType::DK_none; |
Lauro Ramos Venancio | 145cd89 | 2008-02-19 19:27:31 +0000 | [diff] [blame] | 717 | } |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 718 | |
| 719 | llvm::Value *one = llvm::ConstantInt::get(CGF.SizeTy, 1); |
| 720 | |
| 721 | // The 'current element to initialize'. The invariants on this |
| 722 | // variable are complicated. Essentially, after each iteration of |
| 723 | // the loop, it points to the last initialized element, except |
| 724 | // that it points to the beginning of the array before any |
| 725 | // elements have been initialized. |
| 726 | llvm::Value *element = begin; |
| 727 | |
| 728 | // Emit the explicit initializers. |
| 729 | for (uint64_t i = 0; i != NumInitElements; ++i) { |
| 730 | // Advance to the next element. |
John McCall | 2673c68 | 2011-07-11 08:38:19 +0000 | [diff] [blame] | 731 | if (i > 0) { |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 732 | element = Builder.CreateInBoundsGEP(element, one, "arrayinit.element"); |
| 733 | |
John McCall | 2673c68 | 2011-07-11 08:38:19 +0000 | [diff] [blame] | 734 | // Tell the cleanup that it needs to destroy up to this |
| 735 | // element. TODO: some of these stores can be trivially |
| 736 | // observed to be unnecessary. |
| 737 | if (endOfInit) Builder.CreateStore(element, endOfInit); |
| 738 | } |
| 739 | |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 740 | LValue elementLV = CGF.MakeAddrLValue(element, elementType); |
| 741 | EmitInitializationToLValue(E->getInit(i), elementLV); |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 742 | } |
| 743 | |
| 744 | // Check whether there's a non-trivial array-fill expression. |
| 745 | // Note that this will be a CXXConstructExpr even if the element |
| 746 | // type is an array (or array of array, etc.) of class type. |
| 747 | Expr *filler = E->getArrayFiller(); |
| 748 | bool hasTrivialFiller = true; |
| 749 | if (CXXConstructExpr *cons = dyn_cast_or_null<CXXConstructExpr>(filler)) { |
| 750 | assert(cons->getConstructor()->isDefaultConstructor()); |
| 751 | hasTrivialFiller = cons->getConstructor()->isTrivial(); |
| 752 | } |
| 753 | |
| 754 | // Any remaining elements need to be zero-initialized, possibly |
| 755 | // using the filler expression. We can skip this if the we're |
| 756 | // emitting to zeroed memory. |
| 757 | if (NumInitElements != NumArrayElements && |
| 758 | !(Dest.isZeroed() && hasTrivialFiller && |
| 759 | CGF.getTypes().isZeroInitializable(elementType))) { |
| 760 | |
| 761 | // Use an actual loop. This is basically |
| 762 | // do { *array++ = filler; } while (array != end); |
| 763 | |
| 764 | // Advance to the start of the rest of the array. |
John McCall | 2673c68 | 2011-07-11 08:38:19 +0000 | [diff] [blame] | 765 | if (NumInitElements) { |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 766 | element = Builder.CreateInBoundsGEP(element, one, "arrayinit.start"); |
John McCall | 2673c68 | 2011-07-11 08:38:19 +0000 | [diff] [blame] | 767 | if (endOfInit) Builder.CreateStore(element, endOfInit); |
| 768 | } |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 769 | |
| 770 | // Compute the end of the array. |
| 771 | llvm::Value *end = Builder.CreateInBoundsGEP(begin, |
| 772 | llvm::ConstantInt::get(CGF.SizeTy, NumArrayElements), |
| 773 | "arrayinit.end"); |
| 774 | |
| 775 | llvm::BasicBlock *entryBB = Builder.GetInsertBlock(); |
| 776 | llvm::BasicBlock *bodyBB = CGF.createBasicBlock("arrayinit.body"); |
| 777 | |
| 778 | // Jump into the body. |
| 779 | CGF.EmitBlock(bodyBB); |
| 780 | llvm::PHINode *currentElement = |
| 781 | Builder.CreatePHI(element->getType(), 2, "arrayinit.cur"); |
| 782 | currentElement->addIncoming(element, entryBB); |
| 783 | |
| 784 | // Emit the actual filler expression. |
| 785 | LValue elementLV = CGF.MakeAddrLValue(currentElement, elementType); |
| 786 | if (filler) |
| 787 | EmitInitializationToLValue(filler, elementLV); |
| 788 | else |
| 789 | EmitNullInitializationToLValue(elementLV); |
| 790 | |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 791 | // Move on to the next element. |
| 792 | llvm::Value *nextElement = |
| 793 | Builder.CreateInBoundsGEP(currentElement, one, "arrayinit.next"); |
| 794 | |
John McCall | 2673c68 | 2011-07-11 08:38:19 +0000 | [diff] [blame] | 795 | // Tell the EH cleanup that we finished with the last element. |
| 796 | if (endOfInit) Builder.CreateStore(nextElement, endOfInit); |
| 797 | |
John McCall | bdc4d80 | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 798 | // Leave the loop if we're done. |
| 799 | llvm::Value *done = Builder.CreateICmpEQ(nextElement, end, |
| 800 | "arrayinit.done"); |
| 801 | llvm::BasicBlock *endBB = CGF.createBasicBlock("arrayinit.end"); |
| 802 | Builder.CreateCondBr(done, endBB, bodyBB); |
| 803 | currentElement->addIncoming(nextElement, Builder.GetInsertBlock()); |
| 804 | |
| 805 | CGF.EmitBlock(endBB); |
| 806 | } |
| 807 | |
| 808 | // Leave the partial-array cleanup if we entered one. |
| 809 | if (dtorKind) CGF.DeactivateCleanupBlock(cleanup); |
| 810 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 811 | return; |
| 812 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 813 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 814 | assert(E->getType()->isRecordType() && "Only support structs/unions here!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 815 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 816 | // Do struct initialization; this code just sets each individual member |
| 817 | // to the approprate value. This makes bitfield support automatic; |
| 818 | // the disadvantage is that the generated code is more difficult for |
| 819 | // the optimizer, especially with bitfields. |
| 820 | unsigned NumInitElements = E->getNumInits(); |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 821 | RecordDecl *record = E->getType()->castAs<RecordType>()->getDecl(); |
Chris Lattner | bd7de38 | 2010-09-06 00:13:11 +0000 | [diff] [blame] | 822 | |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 823 | if (record->isUnion()) { |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 824 | // Only initialize one field of a union. The field itself is |
| 825 | // specified by the initializer list. |
| 826 | if (!E->getInitializedFieldInUnion()) { |
| 827 | // Empty union; we have nothing to do. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 828 | |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 829 | #ifndef NDEBUG |
| 830 | // Make sure that it's really an empty and not a failure of |
| 831 | // semantic analysis. |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 832 | for (RecordDecl::field_iterator Field = record->field_begin(), |
| 833 | FieldEnd = record->field_end(); |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 834 | Field != FieldEnd; ++Field) |
| 835 | assert(Field->isUnnamedBitfield() && "Only unnamed bitfields allowed"); |
| 836 | #endif |
| 837 | return; |
| 838 | } |
| 839 | |
| 840 | // FIXME: volatility |
| 841 | FieldDecl *Field = E->getInitializedFieldInUnion(); |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 842 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 843 | LValue FieldLoc = CGF.EmitLValueForFieldInitialization(DestPtr, Field, 0); |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 844 | if (NumInitElements) { |
| 845 | // Store the initializer into the field |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 846 | EmitInitializationToLValue(E->getInit(0), FieldLoc); |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 847 | } else { |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 848 | // Default-initialize to null. |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 849 | EmitNullInitializationToLValue(FieldLoc); |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 850 | } |
| 851 | |
| 852 | return; |
| 853 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 854 | |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 855 | // We'll need to enter cleanup scopes in case any of the member |
| 856 | // initializers throw an exception. |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 857 | SmallVector<EHScopeStack::stable_iterator, 16> cleanups; |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 858 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 859 | // Here we iterate over the fields; this makes it simpler to both |
| 860 | // default-initialize fields and skip over unnamed fields. |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 861 | unsigned curInitIndex = 0; |
| 862 | for (RecordDecl::field_iterator field = record->field_begin(), |
| 863 | fieldEnd = record->field_end(); |
| 864 | field != fieldEnd; ++field) { |
| 865 | // We're done once we hit the flexible array member. |
| 866 | if (field->getType()->isIncompleteArrayType()) |
Douglas Gregor | 44b4321 | 2008-12-11 16:49:14 +0000 | [diff] [blame] | 867 | break; |
| 868 | |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 869 | // Always skip anonymous bitfields. |
| 870 | if (field->isUnnamedBitfield()) |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 871 | continue; |
Douglas Gregor | 34e7946 | 2009-01-28 23:36:17 +0000 | [diff] [blame] | 872 | |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 873 | // We're done if we reach the end of the explicit initializers, we |
| 874 | // have a zeroed object, and the rest of the fields are |
| 875 | // zero-initializable. |
| 876 | if (curInitIndex == NumInitElements && Dest.isZeroed() && |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 877 | CGF.getTypes().isZeroInitializable(E->getType())) |
| 878 | break; |
| 879 | |
Eli Friedman | 1e692ac | 2008-06-13 23:01:12 +0000 | [diff] [blame] | 880 | // FIXME: volatility |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 881 | LValue LV = CGF.EmitLValueForFieldInitialization(DestPtr, *field, 0); |
Fariborz Jahanian | 14674ff | 2009-05-27 19:54:11 +0000 | [diff] [blame] | 882 | // We never generate write-barries for initialized fields. |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 883 | LV.setNonGC(true); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 884 | |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 885 | if (curInitIndex < NumInitElements) { |
Chris Lattner | b35baae | 2010-03-08 21:08:07 +0000 | [diff] [blame] | 886 | // Store the initializer into the field. |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 887 | EmitInitializationToLValue(E->getInit(curInitIndex++), LV); |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 888 | } else { |
| 889 | // We're out of initalizers; default-initialize to null |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 890 | EmitNullInitializationToLValue(LV); |
| 891 | } |
| 892 | |
| 893 | // Push a destructor if necessary. |
| 894 | // FIXME: if we have an array of structures, all explicitly |
| 895 | // initialized, we can end up pushing a linear number of cleanups. |
| 896 | bool pushedCleanup = false; |
| 897 | if (QualType::DestructionKind dtorKind |
| 898 | = field->getType().isDestructedType()) { |
| 899 | assert(LV.isSimple()); |
| 900 | if (CGF.needsEHCleanup(dtorKind)) { |
| 901 | CGF.pushDestroy(EHCleanup, LV.getAddress(), field->getType(), |
| 902 | CGF.getDestroyer(dtorKind), false); |
| 903 | cleanups.push_back(CGF.EHStack.stable_begin()); |
| 904 | pushedCleanup = true; |
| 905 | } |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 906 | } |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 907 | |
| 908 | // If the GEP didn't get used because of a dead zero init or something |
| 909 | // else, clean it up for -O0 builds and general tidiness. |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 910 | if (!pushedCleanup && LV.isSimple()) |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 911 | if (llvm::GetElementPtrInst *GEP = |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 912 | dyn_cast<llvm::GetElementPtrInst>(LV.getAddress())) |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 913 | if (GEP->use_empty()) |
| 914 | GEP->eraseFromParent(); |
Lauro Ramos Venancio | 145cd89 | 2008-02-19 19:27:31 +0000 | [diff] [blame] | 915 | } |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 916 | |
| 917 | // Deactivate all the partial cleanups in reverse order, which |
| 918 | // generally means popping them. |
| 919 | for (unsigned i = cleanups.size(); i != 0; --i) |
| 920 | CGF.DeactivateCleanupBlock(cleanups[i-1]); |
Devang Patel | 636c3d0 | 2007-10-26 17:44:44 +0000 | [diff] [blame] | 921 | } |
| 922 | |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 923 | //===----------------------------------------------------------------------===// |
| 924 | // Entry Points into this File |
| 925 | //===----------------------------------------------------------------------===// |
| 926 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 927 | /// GetNumNonZeroBytesInInit - Get an approximate count of the number of |
| 928 | /// non-zero bytes that will be stored when outputting the initializer for the |
| 929 | /// specified initializer expression. |
Ken Dyck | 02c4533 | 2011-04-24 17:17:56 +0000 | [diff] [blame] | 930 | static CharUnits GetNumNonZeroBytesInInit(const Expr *E, CodeGenFunction &CGF) { |
Peter Collingbourne | f111d93 | 2011-04-15 00:35:48 +0000 | [diff] [blame] | 931 | E = E->IgnoreParens(); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 932 | |
| 933 | // 0 and 0.0 won't require any non-zero stores! |
Ken Dyck | 02c4533 | 2011-04-24 17:17:56 +0000 | [diff] [blame] | 934 | if (isSimpleZero(E, CGF)) return CharUnits::Zero(); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 935 | |
| 936 | // If this is an initlist expr, sum up the size of sizes of the (present) |
| 937 | // elements. If this is something weird, assume the whole thing is non-zero. |
| 938 | const InitListExpr *ILE = dyn_cast<InitListExpr>(E); |
| 939 | if (ILE == 0 || !CGF.getTypes().isZeroInitializable(ILE->getType())) |
Ken Dyck | 02c4533 | 2011-04-24 17:17:56 +0000 | [diff] [blame] | 940 | return CGF.getContext().getTypeSizeInChars(E->getType()); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 941 | |
Chris Lattner | d1d56df | 2010-12-02 18:29:00 +0000 | [diff] [blame] | 942 | // InitListExprs for structs have to be handled carefully. If there are |
| 943 | // reference members, we need to consider the size of the reference, not the |
| 944 | // referencee. InitListExprs for unions and arrays can't have references. |
Chris Lattner | 8c00ad1 | 2010-12-02 22:52:04 +0000 | [diff] [blame] | 945 | if (const RecordType *RT = E->getType()->getAs<RecordType>()) { |
| 946 | if (!RT->isUnionType()) { |
| 947 | RecordDecl *SD = E->getType()->getAs<RecordType>()->getDecl(); |
Ken Dyck | 02c4533 | 2011-04-24 17:17:56 +0000 | [diff] [blame] | 948 | CharUnits NumNonZeroBytes = CharUnits::Zero(); |
Chris Lattner | 8c00ad1 | 2010-12-02 22:52:04 +0000 | [diff] [blame] | 949 | |
| 950 | unsigned ILEElement = 0; |
| 951 | for (RecordDecl::field_iterator Field = SD->field_begin(), |
| 952 | FieldEnd = SD->field_end(); Field != FieldEnd; ++Field) { |
| 953 | // We're done once we hit the flexible array member or run out of |
| 954 | // InitListExpr elements. |
| 955 | if (Field->getType()->isIncompleteArrayType() || |
| 956 | ILEElement == ILE->getNumInits()) |
| 957 | break; |
| 958 | if (Field->isUnnamedBitfield()) |
| 959 | continue; |
Chris Lattner | d1d56df | 2010-12-02 18:29:00 +0000 | [diff] [blame] | 960 | |
Chris Lattner | 8c00ad1 | 2010-12-02 22:52:04 +0000 | [diff] [blame] | 961 | const Expr *E = ILE->getInit(ILEElement++); |
| 962 | |
| 963 | // Reference values are always non-null and have the width of a pointer. |
| 964 | if (Field->getType()->isReferenceType()) |
Ken Dyck | 02c4533 | 2011-04-24 17:17:56 +0000 | [diff] [blame] | 965 | NumNonZeroBytes += CGF.getContext().toCharUnitsFromBits( |
| 966 | CGF.getContext().Target.getPointerWidth(0)); |
Chris Lattner | 8c00ad1 | 2010-12-02 22:52:04 +0000 | [diff] [blame] | 967 | else |
| 968 | NumNonZeroBytes += GetNumNonZeroBytesInInit(E, CGF); |
| 969 | } |
Chris Lattner | d1d56df | 2010-12-02 18:29:00 +0000 | [diff] [blame] | 970 | |
Chris Lattner | 8c00ad1 | 2010-12-02 22:52:04 +0000 | [diff] [blame] | 971 | return NumNonZeroBytes; |
Chris Lattner | d1d56df | 2010-12-02 18:29:00 +0000 | [diff] [blame] | 972 | } |
Chris Lattner | d1d56df | 2010-12-02 18:29:00 +0000 | [diff] [blame] | 973 | } |
| 974 | |
| 975 | |
Ken Dyck | 02c4533 | 2011-04-24 17:17:56 +0000 | [diff] [blame] | 976 | CharUnits NumNonZeroBytes = CharUnits::Zero(); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 977 | for (unsigned i = 0, e = ILE->getNumInits(); i != e; ++i) |
| 978 | NumNonZeroBytes += GetNumNonZeroBytesInInit(ILE->getInit(i), CGF); |
| 979 | return NumNonZeroBytes; |
| 980 | } |
| 981 | |
| 982 | /// CheckAggExprForMemSetUse - If the initializer is large and has a lot of |
| 983 | /// zeros in it, emit a memset and avoid storing the individual zeros. |
| 984 | /// |
| 985 | static void CheckAggExprForMemSetUse(AggValueSlot &Slot, const Expr *E, |
| 986 | CodeGenFunction &CGF) { |
| 987 | // If the slot is already known to be zeroed, nothing to do. Don't mess with |
| 988 | // volatile stores. |
| 989 | if (Slot.isZeroed() || Slot.isVolatile() || Slot.getAddr() == 0) return; |
Argyrios Kyrtzidis | 657baf1 | 2011-04-28 22:57:55 +0000 | [diff] [blame] | 990 | |
| 991 | // C++ objects with a user-declared constructor don't need zero'ing. |
| 992 | if (CGF.getContext().getLangOptions().CPlusPlus) |
| 993 | if (const RecordType *RT = CGF.getContext() |
| 994 | .getBaseElementType(E->getType())->getAs<RecordType>()) { |
| 995 | const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); |
| 996 | if (RD->hasUserDeclaredConstructor()) |
| 997 | return; |
| 998 | } |
| 999 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1000 | // 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] | 1001 | std::pair<CharUnits, CharUnits> TypeInfo = |
| 1002 | CGF.getContext().getTypeInfoInChars(E->getType()); |
| 1003 | if (TypeInfo.first <= CharUnits::fromQuantity(16)) |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1004 | return; |
| 1005 | |
| 1006 | // Check to see if over 3/4 of the initializer are known to be zero. If so, |
| 1007 | // we prefer to emit memset + individual stores for the rest. |
Ken Dyck | 5ff1a35 | 2011-04-24 17:25:32 +0000 | [diff] [blame] | 1008 | CharUnits NumNonZeroBytes = GetNumNonZeroBytesInInit(E, CGF); |
| 1009 | if (NumNonZeroBytes*4 > TypeInfo.first) |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1010 | return; |
| 1011 | |
| 1012 | // 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] | 1013 | llvm::Constant *SizeVal = CGF.Builder.getInt64(TypeInfo.first.getQuantity()); |
| 1014 | CharUnits Align = TypeInfo.second; |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1015 | |
| 1016 | llvm::Value *Loc = Slot.getAddr(); |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 1017 | llvm::Type *BP = llvm::Type::getInt8PtrTy(CGF.getLLVMContext()); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1018 | |
| 1019 | Loc = CGF.Builder.CreateBitCast(Loc, BP); |
Ken Dyck | 5ff1a35 | 2011-04-24 17:25:32 +0000 | [diff] [blame] | 1020 | CGF.Builder.CreateMemSet(Loc, CGF.Builder.getInt8(0), SizeVal, |
| 1021 | Align.getQuantity(), false); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1022 | |
| 1023 | // Tell the AggExprEmitter that the slot is known zero. |
| 1024 | Slot.setZeroed(); |
| 1025 | } |
| 1026 | |
| 1027 | |
| 1028 | |
| 1029 | |
Mike Stump | e1129a9 | 2009-05-26 18:57:45 +0000 | [diff] [blame] | 1030 | /// EmitAggExpr - Emit the computation of the specified expression of aggregate |
| 1031 | /// type. The result is computed into DestPtr. Note that if DestPtr is null, |
| 1032 | /// the value of the aggregate expression is not needed. If VolatileDest is |
| 1033 | /// true, DestPtr cannot be 0. |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 1034 | /// |
| 1035 | /// \param IsInitializer - true if this evaluation is initializing an |
| 1036 | /// object whose lifetime is already being managed. |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 1037 | void CodeGenFunction::EmitAggExpr(const Expr *E, AggValueSlot Slot, |
Fariborz Jahanian | 474e2fe | 2010-09-16 00:20:07 +0000 | [diff] [blame] | 1038 | bool IgnoreResult) { |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 1039 | assert(E && hasAggregateLLVMType(E->getType()) && |
| 1040 | "Invalid aggregate expression to emit"); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1041 | assert((Slot.getAddr() != 0 || Slot.isIgnored()) && |
| 1042 | "slot has bits but no address"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1043 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1044 | // Optimize the slot if possible. |
| 1045 | CheckAggExprForMemSetUse(Slot, E, *this); |
| 1046 | |
| 1047 | AggExprEmitter(*this, Slot, IgnoreResult).Visit(const_cast<Expr*>(E)); |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 1048 | } |
Daniel Dunbar | 7482d12 | 2008-09-09 20:49:46 +0000 | [diff] [blame] | 1049 | |
Daniel Dunbar | 18aba0d | 2010-02-05 19:38:31 +0000 | [diff] [blame] | 1050 | LValue CodeGenFunction::EmitAggExprToLValue(const Expr *E) { |
| 1051 | assert(hasAggregateLLVMType(E->getType()) && "Invalid argument!"); |
Daniel Dunbar | 195337d | 2010-02-09 02:48:28 +0000 | [diff] [blame] | 1052 | llvm::Value *Temp = CreateMemTemp(E->getType()); |
Daniel Dunbar | 79c3928 | 2010-08-21 03:15:20 +0000 | [diff] [blame] | 1053 | LValue LV = MakeAddrLValue(Temp, E->getType()); |
John McCall | 7c2349b | 2011-08-25 20:40:09 +0000 | [diff] [blame] | 1054 | EmitAggExpr(E, AggValueSlot::forLValue(LV, AggValueSlot::IsNotDestructed, |
| 1055 | AggValueSlot::DoesNotNeedGCBarriers)); |
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, |
| 1061 | bool isVolatile) { |
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() || |
Fariborz Jahanian | 1d49f21 | 2010-05-20 16:46:55 +0000 | [diff] [blame] | 1068 | Record->hasTrivialCopyAssignment()) && |
Douglas Gregor | e997948 | 2010-05-20 15:39:01 +0000 | [diff] [blame] | 1069 | "Trying to aggregate-copy a type without a trivial copy " |
| 1070 | "constructor or assignment operator"); |
Douglas Gregor | 419aa96 | 2010-05-20 15:48:29 +0000 | [diff] [blame] | 1071 | // Ignore empty classes in C++. |
Douglas Gregor | e997948 | 2010-05-20 15:39:01 +0000 | [diff] [blame] | 1072 | if (Record->isEmpty()) |
Anders Carlsson | 0d7c583 | 2010-05-03 01:20:20 +0000 | [diff] [blame] | 1073 | return; |
| 1074 | } |
| 1075 | } |
| 1076 | |
Chris Lattner | 83c9629 | 2009-02-28 18:31:01 +0000 | [diff] [blame] | 1077 | // Aggregate assignment turns into llvm.memcpy. This is almost valid per |
Chris Lattner | ca4fc2c | 2009-02-28 18:18:58 +0000 | [diff] [blame] | 1078 | // C99 6.5.16.1p3, which states "If the value being stored in an object is |
| 1079 | // read from another object that overlaps in anyway the storage of the first |
| 1080 | // object, then the overlap shall be exact and the two objects shall have |
| 1081 | // qualified or unqualified versions of a compatible type." |
| 1082 | // |
Chris Lattner | 83c9629 | 2009-02-28 18:31:01 +0000 | [diff] [blame] | 1083 | // memcpy is not defined if the source and destination pointers are exactly |
Chris Lattner | ca4fc2c | 2009-02-28 18:18:58 +0000 | [diff] [blame] | 1084 | // equal, but other compilers do this optimization, and almost every memcpy |
| 1085 | // implementation handles this case safely. If there is a libc that does not |
| 1086 | // safely handle this, we can add a target hook. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1087 | |
Daniel Dunbar | 7482d12 | 2008-09-09 20:49:46 +0000 | [diff] [blame] | 1088 | // Get size and alignment info for this aggregate. |
Ken Dyck | 1a8c15a | 2011-04-24 17:37:26 +0000 | [diff] [blame] | 1089 | std::pair<CharUnits, CharUnits> TypeInfo = |
| 1090 | getContext().getTypeInfoInChars(Ty); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1091 | |
Daniel Dunbar | 7482d12 | 2008-09-09 20:49:46 +0000 | [diff] [blame] | 1092 | // FIXME: Handle variable sized types. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1093 | |
Mike Stump | fde6420 | 2009-05-23 04:13:59 +0000 | [diff] [blame] | 1094 | // FIXME: If we have a volatile struct, the optimizer can remove what might |
| 1095 | // appear to be `extra' memory ops: |
| 1096 | // |
| 1097 | // volatile struct { int i; } a, b; |
| 1098 | // |
| 1099 | // int main() { |
| 1100 | // a = b; |
| 1101 | // a = b; |
| 1102 | // } |
| 1103 | // |
Mon P Wang | 3ecd785 | 2010-04-04 03:10:52 +0000 | [diff] [blame] | 1104 | // 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] | 1105 | // either the source or the destination is volatile. |
Mon P Wang | 3ecd785 | 2010-04-04 03:10:52 +0000 | [diff] [blame] | 1106 | |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 1107 | llvm::PointerType *DPT = cast<llvm::PointerType>(DestPtr->getType()); |
| 1108 | llvm::Type *DBP = |
John McCall | d16c2cf | 2011-02-08 08:22:06 +0000 | [diff] [blame] | 1109 | llvm::Type::getInt8PtrTy(getLLVMContext(), DPT->getAddressSpace()); |
Chris Lattner | 098432c | 2010-07-08 00:07:45 +0000 | [diff] [blame] | 1110 | DestPtr = Builder.CreateBitCast(DestPtr, DBP, "tmp"); |
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 *SPT = cast<llvm::PointerType>(SrcPtr->getType()); |
| 1113 | llvm::Type *SBP = |
John McCall | d16c2cf | 2011-02-08 08:22:06 +0000 | [diff] [blame] | 1114 | llvm::Type::getInt8PtrTy(getLLVMContext(), SPT->getAddressSpace()); |
Chris Lattner | 098432c | 2010-07-08 00:07:45 +0000 | [diff] [blame] | 1115 | SrcPtr = Builder.CreateBitCast(SrcPtr, SBP, "tmp"); |
Mon P Wang | 3ecd785 | 2010-04-04 03:10:52 +0000 | [diff] [blame] | 1116 | |
John McCall | f85e193 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 1117 | // Don't do any of the memmove_collectable tests if GC isn't set. |
| 1118 | if (CGM.getLangOptions().getGCMode() == LangOptions::NonGC) { |
| 1119 | // fall through |
| 1120 | } else if (const RecordType *RecordTy = Ty->getAs<RecordType>()) { |
Fariborz Jahanian | 55bcace | 2010-06-15 22:44:06 +0000 | [diff] [blame] | 1121 | RecordDecl *Record = RecordTy->getDecl(); |
| 1122 | if (Record->hasObjectMember()) { |
Ken Dyck | 1a8c15a | 2011-04-24 17:37:26 +0000 | [diff] [blame] | 1123 | CharUnits size = TypeInfo.first; |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 1124 | llvm::Type *SizeTy = ConvertType(getContext().getSizeType()); |
Ken Dyck | 1a8c15a | 2011-04-24 17:37:26 +0000 | [diff] [blame] | 1125 | llvm::Value *SizeVal = llvm::ConstantInt::get(SizeTy, size.getQuantity()); |
Fariborz Jahanian | 55bcace | 2010-06-15 22:44:06 +0000 | [diff] [blame] | 1126 | CGM.getObjCRuntime().EmitGCMemmoveCollectable(*this, DestPtr, SrcPtr, |
| 1127 | SizeVal); |
| 1128 | return; |
| 1129 | } |
John McCall | f85e193 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 1130 | } else if (Ty->isArrayType()) { |
Fariborz Jahanian | 55bcace | 2010-06-15 22:44:06 +0000 | [diff] [blame] | 1131 | QualType BaseType = getContext().getBaseElementType(Ty); |
| 1132 | if (const RecordType *RecordTy = BaseType->getAs<RecordType>()) { |
| 1133 | if (RecordTy->getDecl()->hasObjectMember()) { |
Ken Dyck | 1a8c15a | 2011-04-24 17:37:26 +0000 | [diff] [blame] | 1134 | CharUnits size = TypeInfo.first; |
Chris Lattner | 2acc6e3 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 1135 | llvm::Type *SizeTy = ConvertType(getContext().getSizeType()); |
Ken Dyck | 1a8c15a | 2011-04-24 17:37:26 +0000 | [diff] [blame] | 1136 | llvm::Value *SizeVal = |
| 1137 | llvm::ConstantInt::get(SizeTy, size.getQuantity()); |
Fariborz Jahanian | 55bcace | 2010-06-15 22:44:06 +0000 | [diff] [blame] | 1138 | CGM.getObjCRuntime().EmitGCMemmoveCollectable(*this, DestPtr, SrcPtr, |
| 1139 | SizeVal); |
| 1140 | return; |
| 1141 | } |
| 1142 | } |
| 1143 | } |
| 1144 | |
Benjamin Kramer | 9f0c7cc | 2010-12-30 00:13:21 +0000 | [diff] [blame] | 1145 | Builder.CreateMemCpy(DestPtr, SrcPtr, |
Ken Dyck | 1a8c15a | 2011-04-24 17:37:26 +0000 | [diff] [blame] | 1146 | llvm::ConstantInt::get(IntPtrTy, |
| 1147 | TypeInfo.first.getQuantity()), |
| 1148 | TypeInfo.second.getQuantity(), isVolatile); |
Daniel Dunbar | 7482d12 | 2008-09-09 20:49:46 +0000 | [diff] [blame] | 1149 | } |