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" |
Fariborz Jahanian | 082b02e | 2009-07-08 01:18:33 +0000 | [diff] [blame] | 15 | #include "CGObjCRuntime.h" |
Chandler Carruth | 55fc873 | 2012-12-04 09:13:33 +0000 | [diff] [blame] | 16 | #include "CodeGenModule.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" |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 19 | #include "clang/AST/DeclTemplate.h" |
Daniel Dunbar | de7fb84 | 2008-08-11 05:00:27 +0000 | [diff] [blame] | 20 | #include "clang/AST/StmtVisitor.h" |
Chandler Carruth | 3b844ba | 2013-01-02 11:45:17 +0000 | [diff] [blame] | 21 | #include "llvm/IR/Constants.h" |
| 22 | #include "llvm/IR/Function.h" |
| 23 | #include "llvm/IR/GlobalVariable.h" |
| 24 | #include "llvm/IR/Intrinsics.h" |
Chris Lattner | af6f528 | 2007-08-10 20:13:28 +0000 | [diff] [blame] | 25 | using namespace clang; |
| 26 | using namespace CodeGen; |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 27 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 28 | //===----------------------------------------------------------------------===// |
| 29 | // Aggregate Expression Emitter |
| 30 | //===----------------------------------------------------------------------===// |
| 31 | |
| 32 | namespace { |
Benjamin Kramer | 85b4521 | 2009-11-28 19:45:26 +0000 | [diff] [blame] | 33 | class AggExprEmitter : public StmtVisitor<AggExprEmitter> { |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 34 | CodeGenFunction &CGF; |
Daniel Dunbar | 45d196b | 2008-11-01 01:53:16 +0000 | [diff] [blame] | 35 | CGBuilderTy &Builder; |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 36 | AggValueSlot Dest; |
Pirama Arumuga Nainar | b6d6993 | 2015-07-01 12:25:36 -0700 | [diff] [blame] | 37 | bool IsResultUnused; |
John McCall | ef072fd | 2010-05-22 01:48:05 +0000 | [diff] [blame] | 38 | |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame] | 39 | /// We want to use 'dest' as the return slot except under two |
| 40 | /// conditions: |
| 41 | /// - The destination slot requires garbage collection, so we |
| 42 | /// need to use the GC API. |
| 43 | /// - The destination slot is potentially aliased. |
| 44 | bool shouldUseDestForReturnSlot() const { |
| 45 | return !(Dest.requiresGCollection() || Dest.isPotentiallyAliased()); |
| 46 | } |
| 47 | |
John McCall | ef072fd | 2010-05-22 01:48:05 +0000 | [diff] [blame] | 48 | ReturnValueSlot getReturnValueSlot() const { |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame] | 49 | if (!shouldUseDestForReturnSlot()) |
| 50 | return ReturnValueSlot(); |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 51 | |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 52 | return ReturnValueSlot(Dest.getAddress(), Dest.isVolatile(), |
| 53 | IsResultUnused); |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 54 | } |
| 55 | |
| 56 | AggValueSlot EnsureSlot(QualType T) { |
| 57 | if (!Dest.isIgnored()) return Dest; |
| 58 | return CGF.CreateAggTemp(T, "agg.tmp.ensured"); |
John McCall | ef072fd | 2010-05-22 01:48:05 +0000 | [diff] [blame] | 59 | } |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 60 | void EnsureDest(QualType T) { |
| 61 | if (!Dest.isIgnored()) return; |
| 62 | Dest = CGF.CreateAggTemp(T, "agg.tmp.ensured"); |
| 63 | } |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 64 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 65 | public: |
Pirama Arumuga Nainar | b6d6993 | 2015-07-01 12:25:36 -0700 | [diff] [blame] | 66 | AggExprEmitter(CodeGenFunction &cgf, AggValueSlot Dest, bool IsResultUnused) |
| 67 | : CGF(cgf), Builder(CGF.Builder), Dest(Dest), |
| 68 | IsResultUnused(IsResultUnused) { } |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 69 | |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 70 | //===--------------------------------------------------------------------===// |
| 71 | // Utilities |
| 72 | //===--------------------------------------------------------------------===// |
| 73 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 74 | /// EmitAggLoadOfLValue - Given an expression with aggregate type that |
| 75 | /// represents a value lvalue, this method emits the address of the lvalue, |
| 76 | /// then loads the result into DestPtr. |
| 77 | void EmitAggLoadOfLValue(const Expr *E); |
Eli Friedman | 922696f | 2008-05-19 17:51:16 +0000 | [diff] [blame] | 78 | |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 79 | /// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 80 | void EmitFinalDestCopy(QualType type, const LValue &src); |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 81 | void EmitFinalDestCopy(QualType type, RValue src); |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 82 | void EmitCopy(QualType type, const AggValueSlot &dest, |
| 83 | const AggValueSlot &src); |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 84 | |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame] | 85 | void EmitMoveFromReturnSlot(const Expr *E, RValue Src); |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 86 | |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 87 | void EmitArrayInit(Address DestPtr, llvm::ArrayType *AType, |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 88 | QualType elementType, InitListExpr *E); |
| 89 | |
John McCall | 7c2349b | 2011-08-25 20:40:09 +0000 | [diff] [blame] | 90 | AggValueSlot::NeedsGCBarriers_t needsGC(QualType T) { |
David Blaikie | 4e4d084 | 2012-03-11 07:00:24 +0000 | [diff] [blame] | 91 | if (CGF.getLangOpts().getGC() && TypeRequiresGCollection(T)) |
John McCall | 7c2349b | 2011-08-25 20:40:09 +0000 | [diff] [blame] | 92 | return AggValueSlot::NeedsGCBarriers; |
| 93 | return AggValueSlot::DoesNotNeedGCBarriers; |
| 94 | } |
| 95 | |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 96 | bool TypeRequiresGCollection(QualType T); |
| 97 | |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 98 | //===--------------------------------------------------------------------===// |
| 99 | // Visitor Methods |
| 100 | //===--------------------------------------------------------------------===// |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 101 | |
Stephen Hines | 0e2c34f | 2015-03-23 12:09:02 -0700 | [diff] [blame] | 102 | void Visit(Expr *E) { |
| 103 | ApplyDebugLocation DL(CGF, E); |
| 104 | StmtVisitor<AggExprEmitter>::Visit(E); |
| 105 | } |
| 106 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 107 | void VisitStmt(Stmt *S) { |
Daniel Dunbar | 488e993 | 2008-08-16 00:56:44 +0000 | [diff] [blame] | 108 | CGF.ErrorUnsupported(S, "aggregate expression"); |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 109 | } |
| 110 | void VisitParenExpr(ParenExpr *PE) { Visit(PE->getSubExpr()); } |
Peter Collingbourne | f111d93 | 2011-04-15 00:35:48 +0000 | [diff] [blame] | 111 | void VisitGenericSelectionExpr(GenericSelectionExpr *GE) { |
| 112 | Visit(GE->getResultExpr()); |
| 113 | } |
Eli Friedman | 12444a2 | 2009-01-27 09:03:41 +0000 | [diff] [blame] | 114 | void VisitUnaryExtension(UnaryOperator *E) { Visit(E->getSubExpr()); } |
John McCall | 91a5755 | 2011-07-15 05:09:51 +0000 | [diff] [blame] | 115 | void VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *E) { |
| 116 | return Visit(E->getReplacement()); |
| 117 | } |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 118 | |
| 119 | // l-values. |
John McCall | f4b88a4 | 2012-03-10 09:33:50 +0000 | [diff] [blame] | 120 | void VisitDeclRefExpr(DeclRefExpr *E) { |
John McCall | dd2ecee | 2012-03-10 03:05:10 +0000 | [diff] [blame] | 121 | // For aggregates, we should always be able to emit the variable |
| 122 | // as an l-value unless it's a reference. This is due to the fact |
| 123 | // that we can't actually ever see a normal l2r conversion on an |
| 124 | // aggregate in C++, and in C there's no language standard |
| 125 | // actively preventing us from listing variables in the captures |
| 126 | // list of a block. |
John McCall | f4b88a4 | 2012-03-10 09:33:50 +0000 | [diff] [blame] | 127 | if (E->getDecl()->getType()->isReferenceType()) { |
John McCall | dd2ecee | 2012-03-10 03:05:10 +0000 | [diff] [blame] | 128 | if (CodeGenFunction::ConstantEmission result |
John McCall | f4b88a4 | 2012-03-10 09:33:50 +0000 | [diff] [blame] | 129 | = CGF.tryEmitAsConstant(E)) { |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 130 | EmitFinalDestCopy(E->getType(), result.getReferenceLValue(CGF, E)); |
John McCall | dd2ecee | 2012-03-10 03:05:10 +0000 | [diff] [blame] | 131 | return; |
| 132 | } |
| 133 | } |
| 134 | |
John McCall | f4b88a4 | 2012-03-10 09:33:50 +0000 | [diff] [blame] | 135 | EmitAggLoadOfLValue(E); |
John McCall | dd2ecee | 2012-03-10 03:05:10 +0000 | [diff] [blame] | 136 | } |
| 137 | |
Seo Sanghyeon | 9b73b39 | 2007-12-14 02:04:12 +0000 | [diff] [blame] | 138 | void VisitMemberExpr(MemberExpr *ME) { EmitAggLoadOfLValue(ME); } |
| 139 | void VisitUnaryDeref(UnaryOperator *E) { EmitAggLoadOfLValue(E); } |
Daniel Dunbar | 5be028f | 2010-01-04 18:47:06 +0000 | [diff] [blame] | 140 | void VisitStringLiteral(StringLiteral *E) { EmitAggLoadOfLValue(E); } |
Douglas Gregor | 751ec9b | 2011-06-17 04:59:12 +0000 | [diff] [blame] | 141 | void VisitCompoundLiteralExpr(CompoundLiteralExpr *E); |
Seo Sanghyeon | 9b73b39 | 2007-12-14 02:04:12 +0000 | [diff] [blame] | 142 | void VisitArraySubscriptExpr(ArraySubscriptExpr *E) { |
| 143 | EmitAggLoadOfLValue(E); |
| 144 | } |
Chris Lattner | f0a990c | 2009-04-21 23:00:09 +0000 | [diff] [blame] | 145 | void VisitPredefinedExpr(const PredefinedExpr *E) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 146 | EmitAggLoadOfLValue(E); |
Chris Lattner | f0a990c | 2009-04-21 23:00:09 +0000 | [diff] [blame] | 147 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 148 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 149 | // Operators. |
Anders Carlsson | 4d8673b | 2009-08-07 23:22:37 +0000 | [diff] [blame] | 150 | void VisitCastExpr(CastExpr *E); |
Anders Carlsson | 148fe67 | 2007-10-31 22:04:46 +0000 | [diff] [blame] | 151 | void VisitCallExpr(const CallExpr *E); |
Chris Lattner | b2d963f | 2007-08-31 22:54:14 +0000 | [diff] [blame] | 152 | void VisitStmtExpr(const StmtExpr *E); |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 153 | void VisitBinaryOperator(const BinaryOperator *BO); |
Fariborz Jahanian | 8bfd31f | 2009-10-22 22:57:31 +0000 | [diff] [blame] | 154 | void VisitPointerToDataMemberBinaryOperator(const BinaryOperator *BO); |
Chris Lattner | 03d6fb9 | 2007-08-21 04:43:17 +0000 | [diff] [blame] | 155 | void VisitBinAssign(const BinaryOperator *E); |
Eli Friedman | 07fa52a | 2008-05-20 07:56:31 +0000 | [diff] [blame] | 156 | void VisitBinComma(const BinaryOperator *E); |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 157 | |
Chris Lattner | 8fdf328 | 2008-06-24 17:04:18 +0000 | [diff] [blame] | 158 | void VisitObjCMessageExpr(ObjCMessageExpr *E); |
Daniel Dunbar | 0a04d77 | 2008-08-23 10:51:21 +0000 | [diff] [blame] | 159 | void VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) { |
| 160 | EmitAggLoadOfLValue(E); |
| 161 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 162 | |
Pirama Arumuga Nainar | b6d6993 | 2015-07-01 12:25:36 -0700 | [diff] [blame] | 163 | void VisitDesignatedInitUpdateExpr(DesignatedInitUpdateExpr *E); |
John McCall | 56ca35d | 2011-02-17 10:25:35 +0000 | [diff] [blame] | 164 | void VisitAbstractConditionalOperator(const AbstractConditionalOperator *CO); |
Anders Carlsson | a294ca8 | 2009-07-08 18:33:14 +0000 | [diff] [blame] | 165 | void VisitChooseExpr(const ChooseExpr *CE); |
Devang Patel | 636c3d0 | 2007-10-26 17:44:44 +0000 | [diff] [blame] | 166 | void VisitInitListExpr(InitListExpr *E); |
Anders Carlsson | 30311fa | 2009-12-16 06:57:54 +0000 | [diff] [blame] | 167 | void VisitImplicitValueInitExpr(ImplicitValueInitExpr *E); |
Pirama Arumuga Nainar | b6d6993 | 2015-07-01 12:25:36 -0700 | [diff] [blame] | 168 | void VisitNoInitExpr(NoInitExpr *E) { } // Do nothing. |
Chris Lattner | 0442108 | 2008-04-08 04:40:51 +0000 | [diff] [blame] | 169 | void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) { |
| 170 | Visit(DAE->getExpr()); |
| 171 | } |
Richard Smith | c3bf52c | 2013-04-20 22:23:05 +0000 | [diff] [blame] | 172 | void VisitCXXDefaultInitExpr(CXXDefaultInitExpr *DIE) { |
| 173 | CodeGenFunction::CXXDefaultInitExprScope Scope(CGF); |
| 174 | Visit(DIE->getExpr()); |
| 175 | } |
Anders Carlsson | b58d017 | 2009-05-30 23:23:33 +0000 | [diff] [blame] | 176 | void VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E); |
Anders Carlsson | 31ccf37 | 2009-05-03 17:47:16 +0000 | [diff] [blame] | 177 | void VisitCXXConstructExpr(const CXXConstructExpr *E); |
Pirama Arumuga Nainar | 4967a71 | 2016-09-19 22:19:55 -0700 | [diff] [blame^] | 178 | void VisitCXXInheritedCtorInitExpr(const CXXInheritedCtorInitExpr *E); |
Eli Friedman | 4c5d8af | 2012-02-09 03:32:31 +0000 | [diff] [blame] | 179 | void VisitLambdaExpr(LambdaExpr *E); |
Richard Smith | 7c3e615 | 2013-06-12 22:31:48 +0000 | [diff] [blame] | 180 | void VisitCXXStdInitializerListExpr(CXXStdInitializerListExpr *E); |
John McCall | 4765fa0 | 2010-12-06 08:20:24 +0000 | [diff] [blame] | 181 | void VisitExprWithCleanups(ExprWithCleanups *E); |
Douglas Gregor | ed8abf1 | 2010-07-08 06:14:04 +0000 | [diff] [blame] | 182 | void VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E); |
Mike Stump | 2710c41 | 2009-11-18 00:40:12 +0000 | [diff] [blame] | 183 | void VisitCXXTypeidExpr(CXXTypeidExpr *E) { EmitAggLoadOfLValue(E); } |
Douglas Gregor | 03e8003 | 2011-06-21 17:03:29 +0000 | [diff] [blame] | 184 | void VisitMaterializeTemporaryExpr(MaterializeTemporaryExpr *E); |
John McCall | e996ffd | 2011-02-16 08:02:54 +0000 | [diff] [blame] | 185 | void VisitOpaqueValueExpr(OpaqueValueExpr *E); |
| 186 | |
John McCall | 4b9c2d2 | 2011-11-06 09:01:30 +0000 | [diff] [blame] | 187 | void VisitPseudoObjectExpr(PseudoObjectExpr *E) { |
| 188 | if (E->isGLValue()) { |
| 189 | LValue LV = CGF.EmitPseudoObjectLValue(E); |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 190 | return EmitFinalDestCopy(E->getType(), LV); |
John McCall | 4b9c2d2 | 2011-11-06 09:01:30 +0000 | [diff] [blame] | 191 | } |
| 192 | |
| 193 | CGF.EmitPseudoObjectRValue(E, EnsureSlot(E->getType())); |
| 194 | } |
| 195 | |
Eli Friedman | b185124 | 2008-05-27 15:51:49 +0000 | [diff] [blame] | 196 | void VisitVAArgExpr(VAArgExpr *E); |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 197 | |
Chad Rosier | 649b4a1 | 2012-03-29 17:37:10 +0000 | [diff] [blame] | 198 | void EmitInitializationToLValue(Expr *E, LValue Address); |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 199 | void EmitNullInitializationToLValue(LValue Address); |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 200 | // case Expr::ChooseExprClass: |
Mike Stump | 39406b1 | 2009-12-09 19:24:08 +0000 | [diff] [blame] | 201 | void VisitCXXThrowExpr(const CXXThrowExpr *E) { CGF.EmitCXXThrowExpr(E); } |
Eli Friedman | 276b061 | 2011-10-11 02:20:01 +0000 | [diff] [blame] | 202 | void VisitAtomicExpr(AtomicExpr *E) { |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 203 | RValue Res = CGF.EmitAtomicExpr(E); |
| 204 | EmitFinalDestCopy(E->getType(), Res); |
Eli Friedman | 276b061 | 2011-10-11 02:20:01 +0000 | [diff] [blame] | 205 | } |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 206 | }; |
| 207 | } // end anonymous namespace. |
| 208 | |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 209 | //===----------------------------------------------------------------------===// |
| 210 | // Utilities |
| 211 | //===----------------------------------------------------------------------===// |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 212 | |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 213 | /// EmitAggLoadOfLValue - Given an expression with aggregate type that |
| 214 | /// represents a value lvalue, this method emits the address of the lvalue, |
| 215 | /// then loads the result into DestPtr. |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 216 | void AggExprEmitter::EmitAggLoadOfLValue(const Expr *E) { |
| 217 | LValue LV = CGF.EmitLValue(E); |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 218 | |
| 219 | // If the type of the l-value is atomic, then do an atomic load. |
Stephen Hines | 0e2c34f | 2015-03-23 12:09:02 -0700 | [diff] [blame] | 220 | if (LV.getType()->isAtomicType() || CGF.LValueIsSuitableForInlineAtomic(LV)) { |
Nick Lewycky | 4ee7dc2 | 2013-10-02 02:29:49 +0000 | [diff] [blame] | 221 | CGF.EmitAtomicLoad(LV, E->getExprLoc(), Dest); |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 222 | return; |
| 223 | } |
| 224 | |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 225 | EmitFinalDestCopy(E->getType(), LV); |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 226 | } |
| 227 | |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 228 | /// \brief True if the given aggregate type requires special GC API calls. |
| 229 | bool AggExprEmitter::TypeRequiresGCollection(QualType T) { |
| 230 | // Only record types have members that might require garbage collection. |
| 231 | const RecordType *RecordTy = T->getAs<RecordType>(); |
| 232 | if (!RecordTy) return false; |
| 233 | |
| 234 | // Don't mess with non-trivial C++ types. |
| 235 | RecordDecl *Record = RecordTy->getDecl(); |
| 236 | if (isa<CXXRecordDecl>(Record) && |
Richard Smith | 426391c | 2012-11-16 00:53:38 +0000 | [diff] [blame] | 237 | (cast<CXXRecordDecl>(Record)->hasNonTrivialCopyConstructor() || |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 238 | !cast<CXXRecordDecl>(Record)->hasTrivialDestructor())) |
| 239 | return false; |
| 240 | |
| 241 | // Check whether the type has an object member. |
| 242 | return Record->hasObjectMember(); |
| 243 | } |
| 244 | |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame] | 245 | /// \brief Perform the final move to DestPtr if for some reason |
| 246 | /// getReturnValueSlot() didn't use it directly. |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 247 | /// |
| 248 | /// The idea is that you do something like this: |
| 249 | /// RValue Result = EmitSomething(..., getReturnValueSlot()); |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame] | 250 | /// EmitMoveFromReturnSlot(E, Result); |
| 251 | /// |
| 252 | /// If nothing interferes, this will cause the result to be emitted |
| 253 | /// directly into the return value slot. Otherwise, a final move |
| 254 | /// will be performed. |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 255 | void AggExprEmitter::EmitMoveFromReturnSlot(const Expr *E, RValue src) { |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame] | 256 | if (shouldUseDestForReturnSlot()) { |
| 257 | // Logically, Dest.getAddr() should equal Src.getAggregateAddr(). |
| 258 | // The possibility of undef rvalues complicates that a lot, |
| 259 | // though, so we can't really assert. |
| 260 | return; |
Fariborz Jahanian | 55bcace | 2010-06-15 22:44:06 +0000 | [diff] [blame] | 261 | } |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame] | 262 | |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 263 | // Otherwise, copy from there to the destination. |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 264 | assert(Dest.getPointer() != src.getAggregatePointer()); |
| 265 | EmitFinalDestCopy(E->getType(), src); |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 266 | } |
| 267 | |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 268 | /// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 269 | void AggExprEmitter::EmitFinalDestCopy(QualType type, RValue src) { |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 270 | assert(src.isAggregate() && "value must be aggregate value!"); |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 271 | LValue srcLV = CGF.MakeAddrLValue(src.getAggregateAddress(), type); |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 272 | EmitFinalDestCopy(type, srcLV); |
| 273 | } |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 274 | |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 275 | /// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. |
| 276 | void AggExprEmitter::EmitFinalDestCopy(QualType type, const LValue &src) { |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 277 | // If Dest is ignored, then we're evaluating an aggregate expression |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 278 | // in a context that doesn't care about the result. Note that loads |
| 279 | // from volatile l-values force the existence of a non-ignored |
| 280 | // destination. |
| 281 | if (Dest.isIgnored()) |
| 282 | return; |
Fariborz Jahanian | 8a97005 | 2010-10-22 22:05:03 +0000 | [diff] [blame] | 283 | |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 284 | AggValueSlot srcAgg = |
| 285 | AggValueSlot::forLValue(src, AggValueSlot::IsDestructed, |
| 286 | needsGC(type), AggValueSlot::IsAliased); |
| 287 | EmitCopy(type, Dest, srcAgg); |
| 288 | } |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 289 | |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 290 | /// Perform a copy from the source into the destination. |
| 291 | /// |
| 292 | /// \param type - the type of the aggregate being copied; qualifiers are |
| 293 | /// ignored |
| 294 | void AggExprEmitter::EmitCopy(QualType type, const AggValueSlot &dest, |
| 295 | const AggValueSlot &src) { |
| 296 | if (dest.requiresGCollection()) { |
| 297 | CharUnits sz = CGF.getContext().getTypeSizeInChars(type); |
| 298 | llvm::Value *size = llvm::ConstantInt::get(CGF.SizeTy, sz.getQuantity()); |
Fariborz Jahanian | 08c3213 | 2009-08-31 19:33:16 +0000 | [diff] [blame] | 299 | CGF.CGM.getObjCRuntime().EmitGCMemmoveCollectable(CGF, |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 300 | dest.getAddress(), |
| 301 | src.getAddress(), |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 302 | size); |
Fariborz Jahanian | 08c3213 | 2009-08-31 19:33:16 +0000 | [diff] [blame] | 303 | return; |
| 304 | } |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 305 | |
Mike Stump | 4ac20dd | 2009-05-23 20:28:01 +0000 | [diff] [blame] | 306 | // If the result of the assignment is used, copy the LHS there also. |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 307 | // It's volatile if either side is. Use the minimum alignment of |
| 308 | // the two sides. |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 309 | CGF.EmitAggregateCopy(dest.getAddress(), src.getAddress(), type, |
| 310 | dest.isVolatile() || src.isVolatile()); |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 311 | } |
| 312 | |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 313 | /// \brief Emit the initializer for a std::initializer_list initialized with a |
| 314 | /// real initializer list. |
Richard Smith | 7c3e615 | 2013-06-12 22:31:48 +0000 | [diff] [blame] | 315 | void |
| 316 | AggExprEmitter::VisitCXXStdInitializerListExpr(CXXStdInitializerListExpr *E) { |
| 317 | // Emit an array containing the elements. The array is externally destructed |
| 318 | // if the std::initializer_list object is. |
| 319 | ASTContext &Ctx = CGF.getContext(); |
| 320 | LValue Array = CGF.EmitLValue(E->getSubExpr()); |
| 321 | assert(Array.isSimple() && "initializer_list array not a simple lvalue"); |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 322 | Address ArrayPtr = Array.getAddress(); |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 323 | |
Richard Smith | 7c3e615 | 2013-06-12 22:31:48 +0000 | [diff] [blame] | 324 | const ConstantArrayType *ArrayType = |
| 325 | Ctx.getAsConstantArrayType(E->getSubExpr()->getType()); |
| 326 | assert(ArrayType && "std::initializer_list constructed from non-array"); |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 327 | |
Richard Smith | 7c3e615 | 2013-06-12 22:31:48 +0000 | [diff] [blame] | 328 | // FIXME: Perform the checks on the field types in SemaInit. |
| 329 | RecordDecl *Record = E->getType()->castAs<RecordType>()->getDecl(); |
| 330 | RecordDecl::field_iterator Field = Record->field_begin(); |
| 331 | if (Field == Record->field_end()) { |
| 332 | CGF.ErrorUnsupported(E, "weird std::initializer_list"); |
Sebastian Redl | babcf9d | 2012-02-25 20:51:13 +0000 | [diff] [blame] | 333 | return; |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 334 | } |
| 335 | |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 336 | // Start pointer. |
Richard Smith | 7c3e615 | 2013-06-12 22:31:48 +0000 | [diff] [blame] | 337 | if (!Field->getType()->isPointerType() || |
| 338 | !Ctx.hasSameType(Field->getType()->getPointeeType(), |
| 339 | ArrayType->getElementType())) { |
| 340 | CGF.ErrorUnsupported(E, "weird std::initializer_list"); |
Sebastian Redl | babcf9d | 2012-02-25 20:51:13 +0000 | [diff] [blame] | 341 | return; |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 342 | } |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 343 | |
Richard Smith | 7c3e615 | 2013-06-12 22:31:48 +0000 | [diff] [blame] | 344 | AggValueSlot Dest = EnsureSlot(E->getType()); |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 345 | LValue DestLV = CGF.MakeAddrLValue(Dest.getAddress(), E->getType()); |
Richard Smith | 7c3e615 | 2013-06-12 22:31:48 +0000 | [diff] [blame] | 346 | LValue Start = CGF.EmitLValueForFieldInitialization(DestLV, *Field); |
| 347 | llvm::Value *Zero = llvm::ConstantInt::get(CGF.PtrDiffTy, 0); |
| 348 | llvm::Value *IdxStart[] = { Zero, Zero }; |
| 349 | llvm::Value *ArrayStart = |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 350 | Builder.CreateInBoundsGEP(ArrayPtr.getPointer(), IdxStart, "arraystart"); |
Richard Smith | 7c3e615 | 2013-06-12 22:31:48 +0000 | [diff] [blame] | 351 | CGF.EmitStoreThroughLValue(RValue::get(ArrayStart), Start); |
| 352 | ++Field; |
| 353 | |
| 354 | if (Field == Record->field_end()) { |
| 355 | CGF.ErrorUnsupported(E, "weird std::initializer_list"); |
Sebastian Redl | babcf9d | 2012-02-25 20:51:13 +0000 | [diff] [blame] | 356 | return; |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 357 | } |
Richard Smith | 7c3e615 | 2013-06-12 22:31:48 +0000 | [diff] [blame] | 358 | |
| 359 | llvm::Value *Size = Builder.getInt(ArrayType->getSize()); |
| 360 | LValue EndOrLength = CGF.EmitLValueForFieldInitialization(DestLV, *Field); |
| 361 | if (Field->getType()->isPointerType() && |
| 362 | Ctx.hasSameType(Field->getType()->getPointeeType(), |
| 363 | ArrayType->getElementType())) { |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 364 | // End pointer. |
Richard Smith | 7c3e615 | 2013-06-12 22:31:48 +0000 | [diff] [blame] | 365 | llvm::Value *IdxEnd[] = { Zero, Size }; |
| 366 | llvm::Value *ArrayEnd = |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 367 | Builder.CreateInBoundsGEP(ArrayPtr.getPointer(), IdxEnd, "arrayend"); |
Richard Smith | 7c3e615 | 2013-06-12 22:31:48 +0000 | [diff] [blame] | 368 | CGF.EmitStoreThroughLValue(RValue::get(ArrayEnd), EndOrLength); |
| 369 | } else if (Ctx.hasSameType(Field->getType(), Ctx.getSizeType())) { |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 370 | // Length. |
Richard Smith | 7c3e615 | 2013-06-12 22:31:48 +0000 | [diff] [blame] | 371 | CGF.EmitStoreThroughLValue(RValue::get(Size), EndOrLength); |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 372 | } else { |
Richard Smith | 7c3e615 | 2013-06-12 22:31:48 +0000 | [diff] [blame] | 373 | CGF.ErrorUnsupported(E, "weird std::initializer_list"); |
Sebastian Redl | babcf9d | 2012-02-25 20:51:13 +0000 | [diff] [blame] | 374 | return; |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 375 | } |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 376 | } |
| 377 | |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 378 | /// \brief Determine if E is a trivial array filler, that is, one that is |
| 379 | /// equivalent to zero-initialization. |
| 380 | static bool isTrivialFiller(Expr *E) { |
| 381 | if (!E) |
| 382 | return true; |
| 383 | |
| 384 | if (isa<ImplicitValueInitExpr>(E)) |
| 385 | return true; |
| 386 | |
| 387 | if (auto *ILE = dyn_cast<InitListExpr>(E)) { |
| 388 | if (ILE->getNumInits()) |
| 389 | return false; |
| 390 | return isTrivialFiller(ILE->getArrayFiller()); |
| 391 | } |
| 392 | |
| 393 | if (auto *Cons = dyn_cast_or_null<CXXConstructExpr>(E)) |
| 394 | return Cons->getConstructor()->isDefaultConstructor() && |
| 395 | Cons->getConstructor()->isTrivial(); |
| 396 | |
| 397 | // FIXME: Are there other cases where we can avoid emitting an initializer? |
| 398 | return false; |
| 399 | } |
| 400 | |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 401 | /// \brief Emit initialization of an array from an initializer list. |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 402 | void AggExprEmitter::EmitArrayInit(Address DestPtr, llvm::ArrayType *AType, |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 403 | QualType elementType, InitListExpr *E) { |
| 404 | uint64_t NumInitElements = E->getNumInits(); |
| 405 | |
| 406 | uint64_t NumArrayElements = AType->getNumElements(); |
| 407 | assert(NumInitElements <= NumArrayElements); |
| 408 | |
| 409 | // DestPtr is an array*. Construct an elementType* by drilling |
| 410 | // down a level. |
| 411 | llvm::Value *zero = llvm::ConstantInt::get(CGF.SizeTy, 0); |
| 412 | llvm::Value *indices[] = { zero, zero }; |
| 413 | llvm::Value *begin = |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 414 | Builder.CreateInBoundsGEP(DestPtr.getPointer(), indices, "arrayinit.begin"); |
| 415 | |
| 416 | CharUnits elementSize = CGF.getContext().getTypeSizeInChars(elementType); |
| 417 | CharUnits elementAlign = |
| 418 | DestPtr.getAlignment().alignmentOfArrayElement(elementSize); |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 419 | |
| 420 | // Exception safety requires us to destroy all the |
| 421 | // already-constructed members if an initializer throws. |
| 422 | // For that, we'll need an EH cleanup. |
| 423 | QualType::DestructionKind dtorKind = elementType.isDestructedType(); |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 424 | Address endOfInit = Address::invalid(); |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 425 | EHScopeStack::stable_iterator cleanup; |
Stephen Hines | 6bcf27b | 2014-05-29 04:14:42 -0700 | [diff] [blame] | 426 | llvm::Instruction *cleanupDominator = nullptr; |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 427 | if (CGF.needsEHCleanup(dtorKind)) { |
| 428 | // In principle we could tell the cleanup where we are more |
| 429 | // directly, but the control flow can get so varied here that it |
| 430 | // would actually be quite complex. Therefore we go through an |
| 431 | // alloca. |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 432 | endOfInit = CGF.CreateTempAlloca(begin->getType(), CGF.getPointerAlign(), |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 433 | "arrayinit.endOfInit"); |
| 434 | cleanupDominator = Builder.CreateStore(begin, endOfInit); |
| 435 | CGF.pushIrregularPartialArrayCleanup(begin, endOfInit, elementType, |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 436 | elementAlign, |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 437 | CGF.getDestroyer(dtorKind)); |
| 438 | cleanup = CGF.EHStack.stable_begin(); |
| 439 | |
| 440 | // Otherwise, remember that we didn't need a cleanup. |
| 441 | } else { |
| 442 | dtorKind = QualType::DK_none; |
| 443 | } |
| 444 | |
| 445 | llvm::Value *one = llvm::ConstantInt::get(CGF.SizeTy, 1); |
| 446 | |
| 447 | // The 'current element to initialize'. The invariants on this |
| 448 | // variable are complicated. Essentially, after each iteration of |
| 449 | // the loop, it points to the last initialized element, except |
| 450 | // that it points to the beginning of the array before any |
| 451 | // elements have been initialized. |
| 452 | llvm::Value *element = begin; |
| 453 | |
| 454 | // Emit the explicit initializers. |
| 455 | for (uint64_t i = 0; i != NumInitElements; ++i) { |
| 456 | // Advance to the next element. |
| 457 | if (i > 0) { |
| 458 | element = Builder.CreateInBoundsGEP(element, one, "arrayinit.element"); |
| 459 | |
| 460 | // Tell the cleanup that it needs to destroy up to this |
| 461 | // element. TODO: some of these stores can be trivially |
| 462 | // observed to be unnecessary. |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 463 | if (endOfInit.isValid()) Builder.CreateStore(element, endOfInit); |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 464 | } |
| 465 | |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 466 | LValue elementLV = |
| 467 | CGF.MakeAddrLValue(Address(element, elementAlign), elementType); |
Richard Smith | 7c3e615 | 2013-06-12 22:31:48 +0000 | [diff] [blame] | 468 | EmitInitializationToLValue(E->getInit(i), elementLV); |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 469 | } |
| 470 | |
| 471 | // Check whether there's a non-trivial array-fill expression. |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 472 | Expr *filler = E->getArrayFiller(); |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 473 | bool hasTrivialFiller = isTrivialFiller(filler); |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 474 | |
| 475 | // Any remaining elements need to be zero-initialized, possibly |
| 476 | // using the filler expression. We can skip this if the we're |
| 477 | // emitting to zeroed memory. |
| 478 | if (NumInitElements != NumArrayElements && |
| 479 | !(Dest.isZeroed() && hasTrivialFiller && |
| 480 | CGF.getTypes().isZeroInitializable(elementType))) { |
| 481 | |
| 482 | // Use an actual loop. This is basically |
| 483 | // do { *array++ = filler; } while (array != end); |
| 484 | |
| 485 | // Advance to the start of the rest of the array. |
| 486 | if (NumInitElements) { |
| 487 | element = Builder.CreateInBoundsGEP(element, one, "arrayinit.start"); |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 488 | if (endOfInit.isValid()) Builder.CreateStore(element, endOfInit); |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 489 | } |
| 490 | |
| 491 | // Compute the end of the array. |
| 492 | llvm::Value *end = Builder.CreateInBoundsGEP(begin, |
| 493 | llvm::ConstantInt::get(CGF.SizeTy, NumArrayElements), |
| 494 | "arrayinit.end"); |
| 495 | |
| 496 | llvm::BasicBlock *entryBB = Builder.GetInsertBlock(); |
| 497 | llvm::BasicBlock *bodyBB = CGF.createBasicBlock("arrayinit.body"); |
| 498 | |
| 499 | // Jump into the body. |
| 500 | CGF.EmitBlock(bodyBB); |
| 501 | llvm::PHINode *currentElement = |
| 502 | Builder.CreatePHI(element->getType(), 2, "arrayinit.cur"); |
| 503 | currentElement->addIncoming(element, entryBB); |
| 504 | |
| 505 | // Emit the actual filler expression. |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 506 | LValue elementLV = |
| 507 | CGF.MakeAddrLValue(Address(currentElement, elementAlign), elementType); |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 508 | if (filler) |
Chad Rosier | 649b4a1 | 2012-03-29 17:37:10 +0000 | [diff] [blame] | 509 | EmitInitializationToLValue(filler, elementLV); |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 510 | else |
| 511 | EmitNullInitializationToLValue(elementLV); |
| 512 | |
| 513 | // Move on to the next element. |
| 514 | llvm::Value *nextElement = |
| 515 | Builder.CreateInBoundsGEP(currentElement, one, "arrayinit.next"); |
| 516 | |
| 517 | // Tell the EH cleanup that we finished with the last element. |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 518 | if (endOfInit.isValid()) Builder.CreateStore(nextElement, endOfInit); |
Sebastian Redl | 32cf1f2 | 2012-02-17 08:42:25 +0000 | [diff] [blame] | 519 | |
| 520 | // Leave the loop if we're done. |
| 521 | llvm::Value *done = Builder.CreateICmpEQ(nextElement, end, |
| 522 | "arrayinit.done"); |
| 523 | llvm::BasicBlock *endBB = CGF.createBasicBlock("arrayinit.end"); |
| 524 | Builder.CreateCondBr(done, endBB, bodyBB); |
| 525 | currentElement->addIncoming(nextElement, Builder.GetInsertBlock()); |
| 526 | |
| 527 | CGF.EmitBlock(endBB); |
| 528 | } |
| 529 | |
| 530 | // Leave the partial-array cleanup if we entered one. |
| 531 | if (dtorKind) CGF.DeactivateCleanupBlock(cleanup, cleanupDominator); |
| 532 | } |
| 533 | |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 534 | //===----------------------------------------------------------------------===// |
| 535 | // Visitor Methods |
| 536 | //===----------------------------------------------------------------------===// |
| 537 | |
Douglas Gregor | 03e8003 | 2011-06-21 17:03:29 +0000 | [diff] [blame] | 538 | void AggExprEmitter::VisitMaterializeTemporaryExpr(MaterializeTemporaryExpr *E){ |
| 539 | Visit(E->GetTemporaryExpr()); |
| 540 | } |
| 541 | |
John McCall | e996ffd | 2011-02-16 08:02:54 +0000 | [diff] [blame] | 542 | void AggExprEmitter::VisitOpaqueValueExpr(OpaqueValueExpr *e) { |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 543 | EmitFinalDestCopy(e->getType(), CGF.getOpaqueLValueMapping(e)); |
John McCall | e996ffd | 2011-02-16 08:02:54 +0000 | [diff] [blame] | 544 | } |
| 545 | |
Douglas Gregor | 751ec9b | 2011-06-17 04:59:12 +0000 | [diff] [blame] | 546 | void |
| 547 | AggExprEmitter::VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { |
John McCall | 1723f63 | 2013-03-07 21:36:54 +0000 | [diff] [blame] | 548 | if (Dest.isPotentiallyAliased() && |
| 549 | E->getType().isPODType(CGF.getContext())) { |
Douglas Gregor | 673e98b | 2011-06-17 16:37:20 +0000 | [diff] [blame] | 550 | // For a POD type, just emit a load of the lvalue + a copy, because our |
| 551 | // compound literal might alias the destination. |
Douglas Gregor | 673e98b | 2011-06-17 16:37:20 +0000 | [diff] [blame] | 552 | EmitAggLoadOfLValue(E); |
| 553 | return; |
| 554 | } |
| 555 | |
Douglas Gregor | 751ec9b | 2011-06-17 04:59:12 +0000 | [diff] [blame] | 556 | AggValueSlot Slot = EnsureSlot(E->getType()); |
| 557 | CGF.EmitAggExpr(E->getInitializer(), Slot); |
| 558 | } |
| 559 | |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 560 | /// Attempt to look through various unimportant expressions to find a |
| 561 | /// cast of the given kind. |
| 562 | static Expr *findPeephole(Expr *op, CastKind kind) { |
| 563 | while (true) { |
| 564 | op = op->IgnoreParens(); |
| 565 | if (CastExpr *castE = dyn_cast<CastExpr>(op)) { |
| 566 | if (castE->getCastKind() == kind) |
| 567 | return castE->getSubExpr(); |
| 568 | if (castE->getCastKind() == CK_NoOp) |
| 569 | continue; |
| 570 | } |
Stephen Hines | 6bcf27b | 2014-05-29 04:14:42 -0700 | [diff] [blame] | 571 | return nullptr; |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 572 | } |
| 573 | } |
Douglas Gregor | 751ec9b | 2011-06-17 04:59:12 +0000 | [diff] [blame] | 574 | |
Anders Carlsson | 4d8673b | 2009-08-07 23:22:37 +0000 | [diff] [blame] | 575 | void AggExprEmitter::VisitCastExpr(CastExpr *E) { |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 576 | if (const auto *ECE = dyn_cast<ExplicitCastExpr>(E)) |
| 577 | CGF.CGM.EmitExplicitCastExprType(ECE, &CGF); |
Anders Carlsson | 3016842 | 2009-09-29 01:23:39 +0000 | [diff] [blame] | 578 | switch (E->getCastKind()) { |
Anders Carlsson | 575b374 | 2011-04-11 02:03:26 +0000 | [diff] [blame] | 579 | case CK_Dynamic: { |
Richard Smith | 2c9f87c | 2012-08-24 00:54:33 +0000 | [diff] [blame] | 580 | // FIXME: Can this actually happen? We have no test coverage for it. |
Douglas Gregor | 69cfeb1 | 2010-05-14 21:31:02 +0000 | [diff] [blame] | 581 | assert(isa<CXXDynamicCastExpr>(E) && "CK_Dynamic without a dynamic_cast?"); |
Richard Smith | 2c9f87c | 2012-08-24 00:54:33 +0000 | [diff] [blame] | 582 | LValue LV = CGF.EmitCheckedLValue(E->getSubExpr(), |
Richard Smith | 7ac9ef1 | 2012-09-08 02:08:36 +0000 | [diff] [blame] | 583 | CodeGenFunction::TCK_Load); |
Douglas Gregor | 69cfeb1 | 2010-05-14 21:31:02 +0000 | [diff] [blame] | 584 | // FIXME: Do we also need to handle property references here? |
| 585 | if (LV.isSimple()) |
| 586 | CGF.EmitDynamicCast(LV.getAddress(), cast<CXXDynamicCastExpr>(E)); |
| 587 | else |
| 588 | CGF.CGM.ErrorUnsupported(E, "non-simple lvalue dynamic_cast"); |
| 589 | |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 590 | if (!Dest.isIgnored()) |
| 591 | CGF.CGM.ErrorUnsupported(E, "lvalue dynamic_cast with a destination"); |
Douglas Gregor | 69cfeb1 | 2010-05-14 21:31:02 +0000 | [diff] [blame] | 592 | break; |
| 593 | } |
| 594 | |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 595 | case CK_ToUnion: { |
Pirama Arumuga Nainar | b6d6993 | 2015-07-01 12:25:36 -0700 | [diff] [blame] | 596 | // Evaluate even if the destination is ignored. |
| 597 | if (Dest.isIgnored()) { |
| 598 | CGF.EmitAnyExpr(E->getSubExpr(), AggValueSlot::ignored(), |
| 599 | /*ignoreResult=*/true); |
| 600 | break; |
| 601 | } |
John McCall | 6591271 | 2011-04-12 22:02:02 +0000 | [diff] [blame] | 602 | |
Anders Carlsson | 4d8673b | 2009-08-07 23:22:37 +0000 | [diff] [blame] | 603 | // GCC union extension |
Daniel Dunbar | 79c3928 | 2010-08-21 03:15:20 +0000 | [diff] [blame] | 604 | QualType Ty = E->getSubExpr()->getType(); |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 605 | Address CastPtr = |
| 606 | Builder.CreateElementBitCast(Dest.getAddress(), CGF.ConvertType(Ty)); |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 607 | EmitInitializationToLValue(E->getSubExpr(), |
Chad Rosier | 649b4a1 | 2012-03-29 17:37:10 +0000 | [diff] [blame] | 608 | CGF.MakeAddrLValue(CastPtr, Ty)); |
Anders Carlsson | 3016842 | 2009-09-29 01:23:39 +0000 | [diff] [blame] | 609 | break; |
Nuno Lopes | 7e91627 | 2009-01-15 20:14:33 +0000 | [diff] [blame] | 610 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 611 | |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 612 | case CK_DerivedToBase: |
| 613 | case CK_BaseToDerived: |
| 614 | case CK_UncheckedDerivedToBase: { |
David Blaikie | b219cfc | 2011-09-23 05:06:16 +0000 | [diff] [blame] | 615 | llvm_unreachable("cannot perform hierarchy conversion in EmitAggExpr: " |
Douglas Gregor | 2d6b0e9 | 2010-05-22 05:17:18 +0000 | [diff] [blame] | 616 | "should have been unpacked before we got here"); |
Douglas Gregor | 2d6b0e9 | 2010-05-22 05:17:18 +0000 | [diff] [blame] | 617 | } |
| 618 | |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 619 | case CK_NonAtomicToAtomic: |
| 620 | case CK_AtomicToNonAtomic: { |
| 621 | bool isToAtomic = (E->getCastKind() == CK_NonAtomicToAtomic); |
| 622 | |
| 623 | // Determine the atomic and value types. |
| 624 | QualType atomicType = E->getSubExpr()->getType(); |
| 625 | QualType valueType = E->getType(); |
| 626 | if (isToAtomic) std::swap(atomicType, valueType); |
| 627 | |
| 628 | assert(atomicType->isAtomicType()); |
| 629 | assert(CGF.getContext().hasSameUnqualifiedType(valueType, |
| 630 | atomicType->castAs<AtomicType>()->getValueType())); |
| 631 | |
| 632 | // Just recurse normally if we're ignoring the result or the |
| 633 | // atomic type doesn't change representation. |
| 634 | if (Dest.isIgnored() || !CGF.CGM.isPaddedAtomicType(atomicType)) { |
| 635 | return Visit(E->getSubExpr()); |
| 636 | } |
| 637 | |
| 638 | CastKind peepholeTarget = |
| 639 | (isToAtomic ? CK_AtomicToNonAtomic : CK_NonAtomicToAtomic); |
| 640 | |
| 641 | // These two cases are reverses of each other; try to peephole them. |
| 642 | if (Expr *op = findPeephole(E->getSubExpr(), peepholeTarget)) { |
| 643 | assert(CGF.getContext().hasSameUnqualifiedType(op->getType(), |
| 644 | E->getType()) && |
| 645 | "peephole significantly changed types?"); |
| 646 | return Visit(op); |
| 647 | } |
| 648 | |
| 649 | // If we're converting an r-value of non-atomic type to an r-value |
Eli Friedman | 336d9df | 2013-07-11 01:32:21 +0000 | [diff] [blame] | 650 | // of atomic type, just emit directly into the relevant sub-object. |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 651 | if (isToAtomic) { |
Eli Friedman | 336d9df | 2013-07-11 01:32:21 +0000 | [diff] [blame] | 652 | AggValueSlot valueDest = Dest; |
| 653 | if (!valueDest.isIgnored() && CGF.CGM.isPaddedAtomicType(atomicType)) { |
| 654 | // Zero-initialize. (Strictly speaking, we only need to intialize |
| 655 | // the padding at the end, but this is simpler.) |
| 656 | if (!Dest.isZeroed()) |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 657 | CGF.EmitNullInitialization(Dest.getAddress(), atomicType); |
Eli Friedman | 336d9df | 2013-07-11 01:32:21 +0000 | [diff] [blame] | 658 | |
| 659 | // Build a GEP to refer to the subobject. |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 660 | Address valueAddr = |
| 661 | CGF.Builder.CreateStructGEP(valueDest.getAddress(), 0, |
| 662 | CharUnits()); |
Eli Friedman | 336d9df | 2013-07-11 01:32:21 +0000 | [diff] [blame] | 663 | valueDest = AggValueSlot::forAddr(valueAddr, |
Eli Friedman | 336d9df | 2013-07-11 01:32:21 +0000 | [diff] [blame] | 664 | valueDest.getQualifiers(), |
| 665 | valueDest.isExternallyDestructed(), |
| 666 | valueDest.requiresGCollection(), |
| 667 | valueDest.isPotentiallyAliased(), |
| 668 | AggValueSlot::IsZeroed); |
| 669 | } |
| 670 | |
Eli Friedman | eb1f276 | 2013-07-11 02:28:36 +0000 | [diff] [blame] | 671 | CGF.EmitAggExpr(E->getSubExpr(), valueDest); |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 672 | return; |
| 673 | } |
| 674 | |
| 675 | // Otherwise, we're converting an atomic type to a non-atomic type. |
Eli Friedman | 336d9df | 2013-07-11 01:32:21 +0000 | [diff] [blame] | 676 | // Make an atomic temporary, emit into that, and then copy the value out. |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 677 | AggValueSlot atomicSlot = |
| 678 | CGF.CreateAggTemp(atomicType, "atomic-to-nonatomic.temp"); |
| 679 | CGF.EmitAggExpr(E->getSubExpr(), atomicSlot); |
| 680 | |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 681 | Address valueAddr = |
| 682 | Builder.CreateStructGEP(atomicSlot.getAddress(), 0, CharUnits()); |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 683 | RValue rvalue = RValue::getAggregate(valueAddr, atomicSlot.isVolatile()); |
| 684 | return EmitFinalDestCopy(valueType, rvalue); |
| 685 | } |
| 686 | |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 687 | case CK_LValueToRValue: |
| 688 | // If we're loading from a volatile type, force the destination |
| 689 | // into existence. |
| 690 | if (E->getSubExpr()->getType().isVolatileQualified()) { |
| 691 | EnsureDest(E->getType()); |
| 692 | return Visit(E->getSubExpr()); |
| 693 | } |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 694 | |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 695 | // fallthrough |
| 696 | |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 697 | case CK_NoOp: |
| 698 | case CK_UserDefinedConversion: |
| 699 | case CK_ConstructorConversion: |
Anders Carlsson | 3016842 | 2009-09-29 01:23:39 +0000 | [diff] [blame] | 700 | assert(CGF.getContext().hasSameUnqualifiedType(E->getSubExpr()->getType(), |
| 701 | E->getType()) && |
| 702 | "Implicit cast types must be compatible"); |
| 703 | Visit(E->getSubExpr()); |
| 704 | break; |
John McCall | 0ae287a | 2010-12-01 04:43:34 +0000 | [diff] [blame] | 705 | |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 706 | case CK_LValueBitCast: |
John McCall | 0ae287a | 2010-12-01 04:43:34 +0000 | [diff] [blame] | 707 | llvm_unreachable("should not be emitting lvalue bitcast as rvalue"); |
John McCall | 1de4d4e | 2011-04-07 08:22:57 +0000 | [diff] [blame] | 708 | |
John McCall | 0ae287a | 2010-12-01 04:43:34 +0000 | [diff] [blame] | 709 | case CK_Dependent: |
| 710 | case CK_BitCast: |
| 711 | case CK_ArrayToPointerDecay: |
| 712 | case CK_FunctionToPointerDecay: |
| 713 | case CK_NullToPointer: |
| 714 | case CK_NullToMemberPointer: |
| 715 | case CK_BaseToDerivedMemberPointer: |
| 716 | case CK_DerivedToBaseMemberPointer: |
| 717 | case CK_MemberPointerToBoolean: |
John McCall | 4d4e5c1 | 2012-02-15 01:22:51 +0000 | [diff] [blame] | 718 | case CK_ReinterpretMemberPointer: |
John McCall | 0ae287a | 2010-12-01 04:43:34 +0000 | [diff] [blame] | 719 | case CK_IntegralToPointer: |
| 720 | case CK_PointerToIntegral: |
| 721 | case CK_PointerToBoolean: |
| 722 | case CK_ToVoid: |
| 723 | case CK_VectorSplat: |
| 724 | case CK_IntegralCast: |
Pirama Arumuga Nainar | 4967a71 | 2016-09-19 22:19:55 -0700 | [diff] [blame^] | 725 | case CK_BooleanToSignedIntegral: |
John McCall | 0ae287a | 2010-12-01 04:43:34 +0000 | [diff] [blame] | 726 | case CK_IntegralToBoolean: |
| 727 | case CK_IntegralToFloating: |
| 728 | case CK_FloatingToIntegral: |
| 729 | case CK_FloatingToBoolean: |
| 730 | case CK_FloatingCast: |
John McCall | 1d9b3b2 | 2011-09-09 05:25:32 +0000 | [diff] [blame] | 731 | case CK_CPointerToObjCPointerCast: |
| 732 | case CK_BlockPointerToObjCPointerCast: |
John McCall | 0ae287a | 2010-12-01 04:43:34 +0000 | [diff] [blame] | 733 | case CK_AnyPointerToBlockPointerCast: |
| 734 | case CK_ObjCObjectLValueCast: |
| 735 | case CK_FloatingRealToComplex: |
| 736 | case CK_FloatingComplexToReal: |
| 737 | case CK_FloatingComplexToBoolean: |
| 738 | case CK_FloatingComplexCast: |
| 739 | case CK_FloatingComplexToIntegralComplex: |
| 740 | case CK_IntegralRealToComplex: |
| 741 | case CK_IntegralComplexToReal: |
| 742 | case CK_IntegralComplexToBoolean: |
| 743 | case CK_IntegralComplexCast: |
| 744 | case CK_IntegralComplexToFloatingComplex: |
John McCall | 33e56f3 | 2011-09-10 06:18:15 +0000 | [diff] [blame] | 745 | case CK_ARCProduceObject: |
| 746 | case CK_ARCConsumeObject: |
| 747 | case CK_ARCReclaimReturnedObject: |
| 748 | case CK_ARCExtendBlockObject: |
Douglas Gregor | ac1303e | 2012-02-22 05:02:47 +0000 | [diff] [blame] | 749 | case CK_CopyAndAutoreleaseBlockObject: |
Eli Friedman | a6c66ce | 2012-08-31 00:14:07 +0000 | [diff] [blame] | 750 | case CK_BuiltinFnToFnPtr: |
Guy Benyei | e6b9d80 | 2013-01-20 12:31:11 +0000 | [diff] [blame] | 751 | case CK_ZeroToOCLEvent: |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 752 | case CK_AddressSpaceConversion: |
John McCall | 0ae287a | 2010-12-01 04:43:34 +0000 | [diff] [blame] | 753 | llvm_unreachable("cast kind invalid for aggregate types"); |
Anders Carlsson | 3016842 | 2009-09-29 01:23:39 +0000 | [diff] [blame] | 754 | } |
Anders Carlsson | e4707ff | 2008-01-14 06:28:57 +0000 | [diff] [blame] | 755 | } |
| 756 | |
Chris Lattner | 9619662 | 2008-07-26 22:37:01 +0000 | [diff] [blame] | 757 | void AggExprEmitter::VisitCallExpr(const CallExpr *E) { |
Stephen Hines | 0e2c34f | 2015-03-23 12:09:02 -0700 | [diff] [blame] | 758 | if (E->getCallReturnType(CGF.getContext())->isReferenceType()) { |
Anders Carlsson | e70e8f7 | 2009-05-27 16:45:02 +0000 | [diff] [blame] | 759 | EmitAggLoadOfLValue(E); |
| 760 | return; |
| 761 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 762 | |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 763 | RValue RV = CGF.EmitCallExpr(E, getReturnValueSlot()); |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame] | 764 | EmitMoveFromReturnSlot(E, RV); |
Anders Carlsson | 148fe67 | 2007-10-31 22:04:46 +0000 | [diff] [blame] | 765 | } |
Chris Lattner | 9619662 | 2008-07-26 22:37:01 +0000 | [diff] [blame] | 766 | |
| 767 | void AggExprEmitter::VisitObjCMessageExpr(ObjCMessageExpr *E) { |
John McCall | fa037bd | 2010-05-22 22:13:32 +0000 | [diff] [blame] | 768 | RValue RV = CGF.EmitObjCMessageExpr(E, getReturnValueSlot()); |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame] | 769 | EmitMoveFromReturnSlot(E, RV); |
Chris Lattner | 8fdf328 | 2008-06-24 17:04:18 +0000 | [diff] [blame] | 770 | } |
Anders Carlsson | 148fe67 | 2007-10-31 22:04:46 +0000 | [diff] [blame] | 771 | |
Chris Lattner | 9619662 | 2008-07-26 22:37:01 +0000 | [diff] [blame] | 772 | void AggExprEmitter::VisitBinComma(const BinaryOperator *E) { |
John McCall | 2a41637 | 2010-12-05 02:00:02 +0000 | [diff] [blame] | 773 | CGF.EmitIgnoredExpr(E->getLHS()); |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 774 | Visit(E->getRHS()); |
Eli Friedman | 07fa52a | 2008-05-20 07:56:31 +0000 | [diff] [blame] | 775 | } |
| 776 | |
Chris Lattner | b2d963f | 2007-08-31 22:54:14 +0000 | [diff] [blame] | 777 | void AggExprEmitter::VisitStmtExpr(const StmtExpr *E) { |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 778 | CodeGenFunction::StmtExprEvaluation eval(CGF); |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 779 | CGF.EmitCompoundStmt(*E->getSubStmt(), true, Dest); |
Chris Lattner | b2d963f | 2007-08-31 22:54:14 +0000 | [diff] [blame] | 780 | } |
| 781 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 782 | void AggExprEmitter::VisitBinaryOperator(const BinaryOperator *E) { |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 783 | if (E->getOpcode() == BO_PtrMemD || E->getOpcode() == BO_PtrMemI) |
Fariborz Jahanian | 8bfd31f | 2009-10-22 22:57:31 +0000 | [diff] [blame] | 784 | VisitPointerToDataMemberBinaryOperator(E); |
| 785 | else |
| 786 | CGF.ErrorUnsupported(E, "aggregate binary expression"); |
| 787 | } |
| 788 | |
| 789 | void AggExprEmitter::VisitPointerToDataMemberBinaryOperator( |
| 790 | const BinaryOperator *E) { |
| 791 | LValue LV = CGF.EmitPointerToDataMemberBinaryExpr(E); |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 792 | EmitFinalDestCopy(E->getType(), LV); |
| 793 | } |
| 794 | |
| 795 | /// Is the value of the given expression possibly a reference to or |
| 796 | /// into a __block variable? |
| 797 | static bool isBlockVarRef(const Expr *E) { |
| 798 | // Make sure we look through parens. |
| 799 | E = E->IgnoreParens(); |
| 800 | |
| 801 | // Check for a direct reference to a __block variable. |
| 802 | if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) { |
| 803 | const VarDecl *var = dyn_cast<VarDecl>(DRE->getDecl()); |
| 804 | return (var && var->hasAttr<BlocksAttr>()); |
| 805 | } |
| 806 | |
| 807 | // More complicated stuff. |
| 808 | |
| 809 | // Binary operators. |
| 810 | if (const BinaryOperator *op = dyn_cast<BinaryOperator>(E)) { |
| 811 | // For an assignment or pointer-to-member operation, just care |
| 812 | // about the LHS. |
| 813 | if (op->isAssignmentOp() || op->isPtrMemOp()) |
| 814 | return isBlockVarRef(op->getLHS()); |
| 815 | |
| 816 | // For a comma, just care about the RHS. |
| 817 | if (op->getOpcode() == BO_Comma) |
| 818 | return isBlockVarRef(op->getRHS()); |
| 819 | |
| 820 | // FIXME: pointer arithmetic? |
| 821 | return false; |
| 822 | |
| 823 | // Check both sides of a conditional operator. |
| 824 | } else if (const AbstractConditionalOperator *op |
| 825 | = dyn_cast<AbstractConditionalOperator>(E)) { |
| 826 | return isBlockVarRef(op->getTrueExpr()) |
| 827 | || isBlockVarRef(op->getFalseExpr()); |
| 828 | |
| 829 | // OVEs are required to support BinaryConditionalOperators. |
| 830 | } else if (const OpaqueValueExpr *op |
| 831 | = dyn_cast<OpaqueValueExpr>(E)) { |
| 832 | if (const Expr *src = op->getSourceExpr()) |
| 833 | return isBlockVarRef(src); |
| 834 | |
| 835 | // Casts are necessary to get things like (*(int*)&var) = foo(). |
| 836 | // We don't really care about the kind of cast here, except |
| 837 | // we don't want to look through l2r casts, because it's okay |
| 838 | // to get the *value* in a __block variable. |
| 839 | } else if (const CastExpr *cast = dyn_cast<CastExpr>(E)) { |
| 840 | if (cast->getCastKind() == CK_LValueToRValue) |
| 841 | return false; |
| 842 | return isBlockVarRef(cast->getSubExpr()); |
| 843 | |
| 844 | // Handle unary operators. Again, just aggressively look through |
| 845 | // it, ignoring the operation. |
| 846 | } else if (const UnaryOperator *uop = dyn_cast<UnaryOperator>(E)) { |
| 847 | return isBlockVarRef(uop->getSubExpr()); |
| 848 | |
| 849 | // Look into the base of a field access. |
| 850 | } else if (const MemberExpr *mem = dyn_cast<MemberExpr>(E)) { |
| 851 | return isBlockVarRef(mem->getBase()); |
| 852 | |
| 853 | // Look into the base of a subscript. |
| 854 | } else if (const ArraySubscriptExpr *sub = dyn_cast<ArraySubscriptExpr>(E)) { |
| 855 | return isBlockVarRef(sub->getBase()); |
| 856 | } |
| 857 | |
| 858 | return false; |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 859 | } |
| 860 | |
Chris Lattner | 03d6fb9 | 2007-08-21 04:43:17 +0000 | [diff] [blame] | 861 | void AggExprEmitter::VisitBinAssign(const BinaryOperator *E) { |
Eli Friedman | ff6e2b7 | 2008-02-11 01:09:17 +0000 | [diff] [blame] | 862 | // For an assignment to work, the value on the right has |
| 863 | // to be compatible with the value on the left. |
Eli Friedman | 2dce5f8 | 2009-05-28 23:04:00 +0000 | [diff] [blame] | 864 | assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(), |
| 865 | E->getRHS()->getType()) |
Eli Friedman | ff6e2b7 | 2008-02-11 01:09:17 +0000 | [diff] [blame] | 866 | && "Invalid assignment"); |
John McCall | cd940a1 | 2010-12-06 06:10:02 +0000 | [diff] [blame] | 867 | |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 868 | // If the LHS might be a __block variable, and the RHS can |
| 869 | // potentially cause a block copy, we need to evaluate the RHS first |
| 870 | // so that the assignment goes the right place. |
| 871 | // This is pretty semantically fragile. |
| 872 | if (isBlockVarRef(E->getLHS()) && |
| 873 | E->getRHS()->HasSideEffects(CGF.getContext())) { |
| 874 | // Ensure that we have a destination, and evaluate the RHS into that. |
| 875 | EnsureDest(E->getRHS()->getType()); |
| 876 | Visit(E->getRHS()); |
| 877 | |
| 878 | // Now emit the LHS and copy into it. |
Richard Smith | 4def70d | 2012-10-09 19:52:38 +0000 | [diff] [blame] | 879 | LValue LHS = CGF.EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store); |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 880 | |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 881 | // That copy is an atomic copy if the LHS is atomic. |
Stephen Hines | 0e2c34f | 2015-03-23 12:09:02 -0700 | [diff] [blame] | 882 | if (LHS.getType()->isAtomicType() || |
| 883 | CGF.LValueIsSuitableForInlineAtomic(LHS)) { |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 884 | CGF.EmitAtomicStore(Dest.asRValue(), LHS, /*isInit*/ false); |
| 885 | return; |
| 886 | } |
| 887 | |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 888 | EmitCopy(E->getLHS()->getType(), |
| 889 | AggValueSlot::forLValue(LHS, AggValueSlot::IsDestructed, |
| 890 | needsGC(E->getLHS()->getType()), |
| 891 | AggValueSlot::IsAliased), |
| 892 | Dest); |
| 893 | return; |
| 894 | } |
Chad Rosier | 649b4a1 | 2012-03-29 17:37:10 +0000 | [diff] [blame] | 895 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 896 | LValue LHS = CGF.EmitLValue(E->getLHS()); |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 897 | |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 898 | // If we have an atomic type, evaluate into the destination and then |
| 899 | // do an atomic copy. |
Stephen Hines | 0e2c34f | 2015-03-23 12:09:02 -0700 | [diff] [blame] | 900 | if (LHS.getType()->isAtomicType() || |
| 901 | CGF.LValueIsSuitableForInlineAtomic(LHS)) { |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 902 | EnsureDest(E->getRHS()->getType()); |
| 903 | Visit(E->getRHS()); |
| 904 | CGF.EmitAtomicStore(Dest.asRValue(), LHS, /*isInit*/ false); |
| 905 | return; |
| 906 | } |
| 907 | |
John McCall | db45806 | 2011-11-07 03:59:57 +0000 | [diff] [blame] | 908 | // Codegen the RHS so that it stores directly into the LHS. |
| 909 | AggValueSlot LHSSlot = |
| 910 | AggValueSlot::forLValue(LHS, AggValueSlot::IsDestructed, |
| 911 | needsGC(E->getLHS()->getType()), |
Chad Rosier | 649b4a1 | 2012-03-29 17:37:10 +0000 | [diff] [blame] | 912 | AggValueSlot::IsAliased); |
Fariborz Jahanian | 3ac83d6 | 2013-01-25 23:57:05 +0000 | [diff] [blame] | 913 | // A non-volatile aggregate destination might have volatile member. |
| 914 | if (!LHSSlot.isVolatile() && |
| 915 | CGF.hasVolatileMember(E->getLHS()->getType())) |
| 916 | LHSSlot.setVolatile(true); |
| 917 | |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 918 | CGF.EmitAggExpr(E->getRHS(), LHSSlot); |
| 919 | |
| 920 | // Copy into the destination if the assignment isn't ignored. |
| 921 | EmitFinalDestCopy(E->getType(), LHS); |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 922 | } |
| 923 | |
John McCall | 56ca35d | 2011-02-17 10:25:35 +0000 | [diff] [blame] | 924 | void AggExprEmitter:: |
| 925 | VisitAbstractConditionalOperator(const AbstractConditionalOperator *E) { |
Daniel Dunbar | 9615ecb | 2008-11-13 01:38:36 +0000 | [diff] [blame] | 926 | llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true"); |
| 927 | llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false"); |
| 928 | llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 929 | |
John McCall | 56ca35d | 2011-02-17 10:25:35 +0000 | [diff] [blame] | 930 | // Bind the common expression if necessary. |
Eli Friedman | d97927d | 2012-01-06 20:42:20 +0000 | [diff] [blame] | 931 | CodeGenFunction::OpaqueValueMapping binding(CGF, E); |
John McCall | 56ca35d | 2011-02-17 10:25:35 +0000 | [diff] [blame] | 932 | |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 933 | CodeGenFunction::ConditionalEvaluation eval(CGF); |
Pirama Arumuga Nainar | b6d6993 | 2015-07-01 12:25:36 -0700 | [diff] [blame] | 934 | CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock, |
| 935 | CGF.getProfileCount(E)); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 936 | |
John McCall | 74fb0ed | 2010-11-17 00:07:33 +0000 | [diff] [blame] | 937 | // Save whether the destination's lifetime is externally managed. |
John McCall | fd71fb8 | 2011-08-26 08:02:37 +0000 | [diff] [blame] | 938 | bool isExternallyDestructed = Dest.isExternallyDestructed(); |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 939 | |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 940 | eval.begin(CGF); |
| 941 | CGF.EmitBlock(LHSBlock); |
Pirama Arumuga Nainar | b6d6993 | 2015-07-01 12:25:36 -0700 | [diff] [blame] | 942 | CGF.incrementProfileCounter(E); |
John McCall | 56ca35d | 2011-02-17 10:25:35 +0000 | [diff] [blame] | 943 | Visit(E->getTrueExpr()); |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 944 | eval.end(CGF); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 945 | |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 946 | assert(CGF.HaveInsertPoint() && "expression evaluation ended with no IP!"); |
| 947 | CGF.Builder.CreateBr(ContBlock); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 948 | |
John McCall | 74fb0ed | 2010-11-17 00:07:33 +0000 | [diff] [blame] | 949 | // If the result of an agg expression is unused, then the emission |
| 950 | // of the LHS might need to create a destination slot. That's fine |
| 951 | // 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] | 952 | // we shouldn't claim that it's already being destructed. |
| 953 | Dest.setExternallyDestructed(isExternallyDestructed); |
John McCall | 74fb0ed | 2010-11-17 00:07:33 +0000 | [diff] [blame] | 954 | |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 955 | eval.begin(CGF); |
| 956 | CGF.EmitBlock(RHSBlock); |
John McCall | 56ca35d | 2011-02-17 10:25:35 +0000 | [diff] [blame] | 957 | Visit(E->getFalseExpr()); |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 958 | eval.end(CGF); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 959 | |
Chris Lattner | 9c03356 | 2007-08-21 04:25:47 +0000 | [diff] [blame] | 960 | CGF.EmitBlock(ContBlock); |
Chris Lattner | 883f6a7 | 2007-08-11 00:04:45 +0000 | [diff] [blame] | 961 | } |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 962 | |
Anders Carlsson | a294ca8 | 2009-07-08 18:33:14 +0000 | [diff] [blame] | 963 | void AggExprEmitter::VisitChooseExpr(const ChooseExpr *CE) { |
Eli Friedman | a5e6601 | 2013-07-20 00:40:58 +0000 | [diff] [blame] | 964 | Visit(CE->getChosenSubExpr()); |
Anders Carlsson | a294ca8 | 2009-07-08 18:33:14 +0000 | [diff] [blame] | 965 | } |
| 966 | |
Eli Friedman | b185124 | 2008-05-27 15:51:49 +0000 | [diff] [blame] | 967 | void AggExprEmitter::VisitVAArgExpr(VAArgExpr *VE) { |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 968 | Address ArgValue = Address::invalid(); |
| 969 | Address ArgPtr = CGF.EmitVAArg(VE, ArgValue); |
Anders Carlsson | ddf7cac | 2008-11-04 05:30:00 +0000 | [diff] [blame] | 970 | |
Pirama Arumuga Nainar | 4967a71 | 2016-09-19 22:19:55 -0700 | [diff] [blame^] | 971 | // If EmitVAArg fails, emit an error. |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 972 | if (!ArgPtr.isValid()) { |
Pirama Arumuga Nainar | 4967a71 | 2016-09-19 22:19:55 -0700 | [diff] [blame^] | 973 | CGF.ErrorUnsupported(VE, "aggregate va_arg expression"); |
Sebastian Redl | 0262f02 | 2009-01-09 21:09:38 +0000 | [diff] [blame] | 974 | return; |
| 975 | } |
| 976 | |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 977 | EmitFinalDestCopy(VE->getType(), CGF.MakeAddrLValue(ArgPtr, VE->getType())); |
Eli Friedman | b185124 | 2008-05-27 15:51:49 +0000 | [diff] [blame] | 978 | } |
| 979 | |
Anders Carlsson | b58d017 | 2009-05-30 23:23:33 +0000 | [diff] [blame] | 980 | void AggExprEmitter::VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) { |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 981 | // Ensure that we have a slot, but if we already do, remember |
John McCall | fd71fb8 | 2011-08-26 08:02:37 +0000 | [diff] [blame] | 982 | // whether it was externally destructed. |
| 983 | bool wasExternallyDestructed = Dest.isExternallyDestructed(); |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 984 | EnsureDest(E->getType()); |
John McCall | fd71fb8 | 2011-08-26 08:02:37 +0000 | [diff] [blame] | 985 | |
| 986 | // We're going to push a destructor if there isn't already one. |
| 987 | Dest.setExternallyDestructed(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 988 | |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 989 | Visit(E->getSubExpr()); |
Anders Carlsson | b58d017 | 2009-05-30 23:23:33 +0000 | [diff] [blame] | 990 | |
John McCall | fd71fb8 | 2011-08-26 08:02:37 +0000 | [diff] [blame] | 991 | // Push that destructor we promised. |
| 992 | if (!wasExternallyDestructed) |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 993 | CGF.EmitCXXTemporary(E->getTemporary(), E->getType(), Dest.getAddress()); |
Anders Carlsson | b58d017 | 2009-05-30 23:23:33 +0000 | [diff] [blame] | 994 | } |
| 995 | |
Anders Carlsson | b14095a | 2009-04-17 00:06:03 +0000 | [diff] [blame] | 996 | void |
Anders Carlsson | 31ccf37 | 2009-05-03 17:47:16 +0000 | [diff] [blame] | 997 | AggExprEmitter::VisitCXXConstructExpr(const CXXConstructExpr *E) { |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 998 | AggValueSlot Slot = EnsureSlot(E->getType()); |
| 999 | CGF.EmitCXXConstructExpr(E, Slot); |
Anders Carlsson | 7f6ad15 | 2009-05-19 04:48:36 +0000 | [diff] [blame] | 1000 | } |
| 1001 | |
Pirama Arumuga Nainar | 4967a71 | 2016-09-19 22:19:55 -0700 | [diff] [blame^] | 1002 | void AggExprEmitter::VisitCXXInheritedCtorInitExpr( |
| 1003 | const CXXInheritedCtorInitExpr *E) { |
| 1004 | AggValueSlot Slot = EnsureSlot(E->getType()); |
| 1005 | CGF.EmitInheritedCXXConstructorCall( |
| 1006 | E->getConstructor(), E->constructsVBase(), Slot.getAddress(), |
| 1007 | E->inheritedFromVBase(), E); |
| 1008 | } |
| 1009 | |
Eli Friedman | 4c5d8af | 2012-02-09 03:32:31 +0000 | [diff] [blame] | 1010 | void |
| 1011 | AggExprEmitter::VisitLambdaExpr(LambdaExpr *E) { |
| 1012 | AggValueSlot Slot = EnsureSlot(E->getType()); |
| 1013 | CGF.EmitLambdaExpr(E, Slot); |
| 1014 | } |
| 1015 | |
John McCall | 4765fa0 | 2010-12-06 08:20:24 +0000 | [diff] [blame] | 1016 | void AggExprEmitter::VisitExprWithCleanups(ExprWithCleanups *E) { |
John McCall | 1a343eb | 2011-11-10 08:15:53 +0000 | [diff] [blame] | 1017 | CGF.enterFullExpression(E); |
| 1018 | CodeGenFunction::RunCleanupsScope cleanups(CGF); |
| 1019 | Visit(E->getSubExpr()); |
Anders Carlsson | b14095a | 2009-04-17 00:06:03 +0000 | [diff] [blame] | 1020 | } |
| 1021 | |
Douglas Gregor | ed8abf1 | 2010-07-08 06:14:04 +0000 | [diff] [blame] | 1022 | void AggExprEmitter::VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E) { |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 1023 | QualType T = E->getType(); |
| 1024 | AggValueSlot Slot = EnsureSlot(T); |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 1025 | EmitNullInitializationToLValue(CGF.MakeAddrLValue(Slot.getAddress(), T)); |
Anders Carlsson | 30311fa | 2009-12-16 06:57:54 +0000 | [diff] [blame] | 1026 | } |
| 1027 | |
| 1028 | void AggExprEmitter::VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) { |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 1029 | QualType T = E->getType(); |
| 1030 | AggValueSlot Slot = EnsureSlot(T); |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 1031 | EmitNullInitializationToLValue(CGF.MakeAddrLValue(Slot.getAddress(), T)); |
Nuno Lopes | 329763b | 2009-10-18 15:18:11 +0000 | [diff] [blame] | 1032 | } |
| 1033 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1034 | /// isSimpleZero - If emitting this value will obviously just cause a store of |
| 1035 | /// zero to memory, return true. This can return false if uncertain, so it just |
| 1036 | /// handles simple cases. |
| 1037 | static bool isSimpleZero(const Expr *E, CodeGenFunction &CGF) { |
Peter Collingbourne | f111d93 | 2011-04-15 00:35:48 +0000 | [diff] [blame] | 1038 | E = E->IgnoreParens(); |
| 1039 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1040 | // 0 |
| 1041 | if (const IntegerLiteral *IL = dyn_cast<IntegerLiteral>(E)) |
| 1042 | return IL->getValue() == 0; |
| 1043 | // +0.0 |
| 1044 | if (const FloatingLiteral *FL = dyn_cast<FloatingLiteral>(E)) |
| 1045 | return FL->getValue().isPosZero(); |
| 1046 | // int() |
| 1047 | if ((isa<ImplicitValueInitExpr>(E) || isa<CXXScalarValueInitExpr>(E)) && |
| 1048 | CGF.getTypes().isZeroInitializable(E->getType())) |
| 1049 | return true; |
| 1050 | // (int*)0 - Null pointer expressions. |
| 1051 | if (const CastExpr *ICE = dyn_cast<CastExpr>(E)) |
| 1052 | return ICE->getCastKind() == CK_NullToPointer; |
| 1053 | // '\0' |
| 1054 | if (const CharacterLiteral *CL = dyn_cast<CharacterLiteral>(E)) |
| 1055 | return CL->getValue() == 0; |
| 1056 | |
| 1057 | // Otherwise, hard case: conservatively return false. |
| 1058 | return false; |
| 1059 | } |
| 1060 | |
| 1061 | |
Anders Carlsson | 78e83f8 | 2010-02-03 17:33:16 +0000 | [diff] [blame] | 1062 | void |
Nick Lewycky | 4ee7dc2 | 2013-10-02 02:29:49 +0000 | [diff] [blame] | 1063 | AggExprEmitter::EmitInitializationToLValue(Expr *E, LValue LV) { |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 1064 | QualType type = LV.getType(); |
Mike Stump | 7f79f9b | 2009-05-29 15:46:01 +0000 | [diff] [blame] | 1065 | // FIXME: Ignore result? |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 1066 | // FIXME: Are initializers affected by volatile? |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1067 | if (Dest.isZeroed() && isSimpleZero(E, CGF)) { |
| 1068 | // Storing "i32 0" to a zero'd memory location is a noop. |
John McCall | 9d232c8 | 2013-03-07 21:37:08 +0000 | [diff] [blame] | 1069 | return; |
Richard Smith | 0dbe2fb | 2012-12-21 03:17:28 +0000 | [diff] [blame] | 1070 | } else if (isa<ImplicitValueInitExpr>(E) || isa<CXXScalarValueInitExpr>(E)) { |
John McCall | 9d232c8 | 2013-03-07 21:37:08 +0000 | [diff] [blame] | 1071 | return EmitNullInitializationToLValue(LV); |
Pirama Arumuga Nainar | b6d6993 | 2015-07-01 12:25:36 -0700 | [diff] [blame] | 1072 | } else if (isa<NoInitExpr>(E)) { |
| 1073 | // Do nothing. |
| 1074 | return; |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 1075 | } else if (type->isReferenceType()) { |
Richard Smith | d4ec562 | 2013-06-12 23:38:09 +0000 | [diff] [blame] | 1076 | RValue RV = CGF.EmitReferenceBindingToExpr(E); |
John McCall | 9d232c8 | 2013-03-07 21:37:08 +0000 | [diff] [blame] | 1077 | return CGF.EmitStoreThroughLValue(RV, LV); |
| 1078 | } |
| 1079 | |
| 1080 | switch (CGF.getEvaluationKind(type)) { |
| 1081 | case TEK_Complex: |
| 1082 | CGF.EmitComplexExprIntoLValue(E, LV, /*isInit*/ true); |
| 1083 | return; |
| 1084 | case TEK_Aggregate: |
John McCall | 7c2349b | 2011-08-25 20:40:09 +0000 | [diff] [blame] | 1085 | CGF.EmitAggExpr(E, AggValueSlot::forLValue(LV, |
| 1086 | AggValueSlot::IsDestructed, |
| 1087 | AggValueSlot::DoesNotNeedGCBarriers, |
John McCall | 410ffb2 | 2011-08-25 23:04:34 +0000 | [diff] [blame] | 1088 | AggValueSlot::IsNotAliased, |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 1089 | Dest.isZeroed())); |
John McCall | 9d232c8 | 2013-03-07 21:37:08 +0000 | [diff] [blame] | 1090 | return; |
| 1091 | case TEK_Scalar: |
| 1092 | if (LV.isSimple()) { |
Stephen Hines | 6bcf27b | 2014-05-29 04:14:42 -0700 | [diff] [blame] | 1093 | CGF.EmitScalarInit(E, /*D=*/nullptr, LV, /*Captured=*/false); |
John McCall | 9d232c8 | 2013-03-07 21:37:08 +0000 | [diff] [blame] | 1094 | } else { |
| 1095 | CGF.EmitStoreThroughLValue(RValue::get(CGF.EmitScalarExpr(E)), LV); |
| 1096 | } |
| 1097 | return; |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 1098 | } |
John McCall | 9d232c8 | 2013-03-07 21:37:08 +0000 | [diff] [blame] | 1099 | llvm_unreachable("bad evaluation kind"); |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 1100 | } |
| 1101 | |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 1102 | void AggExprEmitter::EmitNullInitializationToLValue(LValue lv) { |
| 1103 | QualType type = lv.getType(); |
| 1104 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1105 | // If the destination slot is already zeroed out before the aggregate is |
| 1106 | // copied into it, we don't have to emit any zeros here. |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 1107 | if (Dest.isZeroed() && CGF.getTypes().isZeroInitializable(type)) |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1108 | return; |
| 1109 | |
John McCall | 9d232c8 | 2013-03-07 21:37:08 +0000 | [diff] [blame] | 1110 | if (CGF.hasScalarEvaluationKind(type)) { |
Richard Smith | 0dbe2fb | 2012-12-21 03:17:28 +0000 | [diff] [blame] | 1111 | // For non-aggregates, we can store the appropriate null constant. |
| 1112 | llvm::Value *null = CGF.CGM.EmitNullConstant(type); |
Eli Friedman | b1e3f32 | 2012-02-22 05:38:59 +0000 | [diff] [blame] | 1113 | // Note that the following is not equivalent to |
| 1114 | // EmitStoreThroughBitfieldLValue for ARC types. |
Eli Friedman | 5a13d4d | 2012-02-24 23:53:49 +0000 | [diff] [blame] | 1115 | if (lv.isBitField()) { |
Eli Friedman | b1e3f32 | 2012-02-22 05:38:59 +0000 | [diff] [blame] | 1116 | CGF.EmitStoreThroughBitfieldLValue(RValue::get(null), lv); |
Eli Friedman | 5a13d4d | 2012-02-24 23:53:49 +0000 | [diff] [blame] | 1117 | } else { |
| 1118 | assert(lv.isSimple()); |
| 1119 | CGF.EmitStoreOfScalar(null, lv, /* isInitialization */ true); |
| 1120 | } |
Lauro Ramos Venancio | 145cd89 | 2008-02-19 19:27:31 +0000 | [diff] [blame] | 1121 | } else { |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 1122 | // There's a potential optimization opportunity in combining |
| 1123 | // memsets; that would be easy for arrays, but relatively |
| 1124 | // difficult for structures with the current code. |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 1125 | CGF.EmitNullInitialization(lv.getAddress(), lv.getType()); |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 1126 | } |
| 1127 | } |
| 1128 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 1129 | void AggExprEmitter::VisitInitListExpr(InitListExpr *E) { |
Eli Friedman | a385b3c | 2008-12-02 01:17:45 +0000 | [diff] [blame] | 1130 | #if 0 |
Eli Friedman | 13a5be1 | 2009-12-04 01:30:56 +0000 | [diff] [blame] | 1131 | // FIXME: Assess perf here? Figure out what cases are worth optimizing here |
| 1132 | // (Length of globals? Chunks of zeroed-out space?). |
Eli Friedman | a385b3c | 2008-12-02 01:17:45 +0000 | [diff] [blame] | 1133 | // |
Mike Stump | f5408fe | 2009-05-16 07:57:57 +0000 | [diff] [blame] | 1134 | // If we can, prefer a copy from a global; this is a lot less code for long |
| 1135 | // globals, and it's easier for the current optimizers to analyze. |
Eli Friedman | 13a5be1 | 2009-12-04 01:30:56 +0000 | [diff] [blame] | 1136 | if (llvm::Constant* C = CGF.CGM.EmitConstantExpr(E, E->getType(), &CGF)) { |
Eli Friedman | 994ffef | 2008-11-30 02:11:09 +0000 | [diff] [blame] | 1137 | llvm::GlobalVariable* GV = |
Eli Friedman | 13a5be1 | 2009-12-04 01:30:56 +0000 | [diff] [blame] | 1138 | new llvm::GlobalVariable(CGF.CGM.getModule(), C->getType(), true, |
| 1139 | llvm::GlobalValue::InternalLinkage, C, ""); |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 1140 | EmitFinalDestCopy(E->getType(), CGF.MakeAddrLValue(GV, E->getType())); |
Eli Friedman | 994ffef | 2008-11-30 02:11:09 +0000 | [diff] [blame] | 1141 | return; |
| 1142 | } |
Eli Friedman | a385b3c | 2008-12-02 01:17:45 +0000 | [diff] [blame] | 1143 | #endif |
Chris Lattner | d0db03a | 2010-09-06 00:11:41 +0000 | [diff] [blame] | 1144 | if (E->hadArrayRangeDesignator()) |
Douglas Gregor | a9c8780 | 2009-01-29 19:42:23 +0000 | [diff] [blame] | 1145 | CGF.ErrorUnsupported(E, "GNU array range designator extension"); |
Douglas Gregor | a9c8780 | 2009-01-29 19:42:23 +0000 | [diff] [blame] | 1146 | |
Richard Smith | e69fb20 | 2013-05-23 21:54:14 +0000 | [diff] [blame] | 1147 | AggValueSlot Dest = EnsureSlot(E->getType()); |
| 1148 | |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 1149 | LValue DestLV = CGF.MakeAddrLValue(Dest.getAddress(), E->getType()); |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 1150 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 1151 | // Handle initialization of an array. |
| 1152 | if (E->getType()->isArrayType()) { |
Richard Smith | fe58720 | 2012-04-15 02:50:59 +0000 | [diff] [blame] | 1153 | if (E->isStringLiteralInit()) |
| 1154 | return Visit(E->getInit(0)); |
Eli Friedman | 922696f | 2008-05-19 17:51:16 +0000 | [diff] [blame] | 1155 | |
Eli Friedman | 5c89c39 | 2012-02-23 02:25:10 +0000 | [diff] [blame] | 1156 | QualType elementType = |
| 1157 | CGF.getContext().getAsArrayType(E->getType())->getElementType(); |
Argyrios Kyrtzidis | 3b4d490 | 2011-04-28 18:53:58 +0000 | [diff] [blame] | 1158 | |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 1159 | auto AType = cast<llvm::ArrayType>(Dest.getAddress().getElementType()); |
| 1160 | EmitArrayInit(Dest.getAddress(), AType, elementType, E); |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 1161 | return; |
| 1162 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1163 | |
Stephen Hines | 176edba | 2014-12-01 14:53:08 -0800 | [diff] [blame] | 1164 | if (E->getType()->isAtomicType()) { |
| 1165 | // An _Atomic(T) object can be list-initialized from an expression |
| 1166 | // of the same type. |
| 1167 | assert(E->getNumInits() == 1 && |
| 1168 | CGF.getContext().hasSameUnqualifiedType(E->getInit(0)->getType(), |
| 1169 | E->getType()) && |
| 1170 | "unexpected list initialization for atomic object"); |
| 1171 | return Visit(E->getInit(0)); |
| 1172 | } |
| 1173 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 1174 | assert(E->getType()->isRecordType() && "Only support structs/unions here!"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1175 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 1176 | // Do struct initialization; this code just sets each individual member |
| 1177 | // to the approprate value. This makes bitfield support automatic; |
| 1178 | // the disadvantage is that the generated code is more difficult for |
| 1179 | // the optimizer, especially with bitfields. |
| 1180 | unsigned NumInitElements = E->getNumInits(); |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 1181 | RecordDecl *record = E->getType()->castAs<RecordType>()->getDecl(); |
Richard Smith | c3bf52c | 2013-04-20 22:23:05 +0000 | [diff] [blame] | 1182 | |
Pirama Arumuga Nainar | 4967a71 | 2016-09-19 22:19:55 -0700 | [diff] [blame^] | 1183 | // We'll need to enter cleanup scopes in case any of the element |
| 1184 | // initializers throws an exception. |
| 1185 | SmallVector<EHScopeStack::stable_iterator, 16> cleanups; |
| 1186 | llvm::Instruction *cleanupDominator = nullptr; |
| 1187 | |
| 1188 | unsigned curInitIndex = 0; |
| 1189 | |
| 1190 | // Emit initialization of base classes. |
| 1191 | if (auto *CXXRD = dyn_cast<CXXRecordDecl>(record)) { |
| 1192 | assert(E->getNumInits() >= CXXRD->getNumBases() && |
| 1193 | "missing initializer for base class"); |
| 1194 | for (auto &Base : CXXRD->bases()) { |
| 1195 | assert(!Base.isVirtual() && "should not see vbases here"); |
| 1196 | auto *BaseRD = Base.getType()->getAsCXXRecordDecl(); |
| 1197 | Address V = CGF.GetAddressOfDirectBaseInCompleteClass( |
| 1198 | Dest.getAddress(), CXXRD, BaseRD, |
| 1199 | /*isBaseVirtual*/ false); |
| 1200 | AggValueSlot AggSlot = |
| 1201 | AggValueSlot::forAddr(V, Qualifiers(), |
| 1202 | AggValueSlot::IsDestructed, |
| 1203 | AggValueSlot::DoesNotNeedGCBarriers, |
| 1204 | AggValueSlot::IsNotAliased); |
| 1205 | CGF.EmitAggExpr(E->getInit(curInitIndex++), AggSlot); |
| 1206 | |
| 1207 | if (QualType::DestructionKind dtorKind = |
| 1208 | Base.getType().isDestructedType()) { |
| 1209 | CGF.pushDestroy(dtorKind, V, Base.getType()); |
| 1210 | cleanups.push_back(CGF.EHStack.stable_begin()); |
| 1211 | } |
| 1212 | } |
| 1213 | } |
| 1214 | |
Richard Smith | c3bf52c | 2013-04-20 22:23:05 +0000 | [diff] [blame] | 1215 | // Prepare a 'this' for CXXDefaultInitExprs. |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 1216 | CodeGenFunction::FieldConstructionScope FCS(CGF, Dest.getAddress()); |
Richard Smith | c3bf52c | 2013-04-20 22:23:05 +0000 | [diff] [blame] | 1217 | |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 1218 | if (record->isUnion()) { |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 1219 | // Only initialize one field of a union. The field itself is |
| 1220 | // specified by the initializer list. |
| 1221 | if (!E->getInitializedFieldInUnion()) { |
| 1222 | // Empty union; we have nothing to do. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1223 | |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 1224 | #ifndef NDEBUG |
| 1225 | // Make sure that it's really an empty and not a failure of |
| 1226 | // semantic analysis. |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 1227 | for (const auto *Field : record->fields()) |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 1228 | assert(Field->isUnnamedBitfield() && "Only unnamed bitfields allowed"); |
| 1229 | #endif |
| 1230 | return; |
| 1231 | } |
| 1232 | |
| 1233 | // FIXME: volatility |
| 1234 | FieldDecl *Field = E->getInitializedFieldInUnion(); |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 1235 | |
Eli Friedman | 377ecc7 | 2012-04-16 03:54:45 +0000 | [diff] [blame] | 1236 | LValue FieldLoc = CGF.EmitLValueForFieldInitialization(DestLV, Field); |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 1237 | if (NumInitElements) { |
| 1238 | // Store the initializer into the field |
Chad Rosier | 649b4a1 | 2012-03-29 17:37:10 +0000 | [diff] [blame] | 1239 | EmitInitializationToLValue(E->getInit(0), FieldLoc); |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 1240 | } else { |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1241 | // Default-initialize to null. |
John McCall | a07398e | 2011-06-16 04:16:24 +0000 | [diff] [blame] | 1242 | EmitNullInitializationToLValue(FieldLoc); |
Douglas Gregor | 0bb7689 | 2009-01-29 16:53:55 +0000 | [diff] [blame] | 1243 | } |
| 1244 | |
| 1245 | return; |
| 1246 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1247 | |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 1248 | // Here we iterate over the fields; this makes it simpler to both |
| 1249 | // default-initialize fields and skip over unnamed fields. |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 1250 | for (const auto *field : record->fields()) { |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 1251 | // We're done once we hit the flexible array member. |
| 1252 | if (field->getType()->isIncompleteArrayType()) |
Douglas Gregor | 44b4321 | 2008-12-11 16:49:14 +0000 | [diff] [blame] | 1253 | break; |
| 1254 | |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 1255 | // Always skip anonymous bitfields. |
| 1256 | if (field->isUnnamedBitfield()) |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 1257 | continue; |
Douglas Gregor | 34e7946 | 2009-01-28 23:36:17 +0000 | [diff] [blame] | 1258 | |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 1259 | // We're done if we reach the end of the explicit initializers, we |
| 1260 | // have a zeroed object, and the rest of the fields are |
| 1261 | // zero-initializable. |
| 1262 | if (curInitIndex == NumInitElements && Dest.isZeroed() && |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1263 | CGF.getTypes().isZeroInitializable(E->getType())) |
| 1264 | break; |
| 1265 | |
Eli Friedman | 377ecc7 | 2012-04-16 03:54:45 +0000 | [diff] [blame] | 1266 | |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 1267 | LValue LV = CGF.EmitLValueForFieldInitialization(DestLV, field); |
Fariborz Jahanian | 14674ff | 2009-05-27 19:54:11 +0000 | [diff] [blame] | 1268 | // We never generate write-barries for initialized fields. |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 1269 | LV.setNonGC(true); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1270 | |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 1271 | if (curInitIndex < NumInitElements) { |
Chris Lattner | b35baae | 2010-03-08 21:08:07 +0000 | [diff] [blame] | 1272 | // Store the initializer into the field. |
Chad Rosier | 649b4a1 | 2012-03-29 17:37:10 +0000 | [diff] [blame] | 1273 | EmitInitializationToLValue(E->getInit(curInitIndex++), LV); |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 1274 | } else { |
| 1275 | // We're out of initalizers; default-initialize to null |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 1276 | EmitNullInitializationToLValue(LV); |
| 1277 | } |
| 1278 | |
| 1279 | // Push a destructor if necessary. |
| 1280 | // FIXME: if we have an array of structures, all explicitly |
| 1281 | // initialized, we can end up pushing a linear number of cleanups. |
| 1282 | bool pushedCleanup = false; |
| 1283 | if (QualType::DestructionKind dtorKind |
| 1284 | = field->getType().isDestructedType()) { |
| 1285 | assert(LV.isSimple()); |
| 1286 | if (CGF.needsEHCleanup(dtorKind)) { |
John McCall | 6f103ba | 2011-11-10 10:43:54 +0000 | [diff] [blame] | 1287 | if (!cleanupDominator) |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 1288 | cleanupDominator = CGF.Builder.CreateAlignedLoad( |
| 1289 | CGF.Int8Ty, |
| 1290 | llvm::Constant::getNullValue(CGF.Int8PtrTy), |
| 1291 | CharUnits::One()); // placeholder |
John McCall | 6f103ba | 2011-11-10 10:43:54 +0000 | [diff] [blame] | 1292 | |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 1293 | CGF.pushDestroy(EHCleanup, LV.getAddress(), field->getType(), |
| 1294 | CGF.getDestroyer(dtorKind), false); |
| 1295 | cleanups.push_back(CGF.EHStack.stable_begin()); |
| 1296 | pushedCleanup = true; |
| 1297 | } |
Chris Lattner | f81557c | 2008-04-04 18:42:16 +0000 | [diff] [blame] | 1298 | } |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1299 | |
| 1300 | // If the GEP didn't get used because of a dead zero init or something |
| 1301 | // else, clean it up for -O0 builds and general tidiness. |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 1302 | if (!pushedCleanup && LV.isSimple()) |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1303 | if (llvm::GetElementPtrInst *GEP = |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 1304 | dyn_cast<llvm::GetElementPtrInst>(LV.getPointer())) |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1305 | if (GEP->use_empty()) |
| 1306 | GEP->eraseFromParent(); |
Lauro Ramos Venancio | 145cd89 | 2008-02-19 19:27:31 +0000 | [diff] [blame] | 1307 | } |
John McCall | 2b30dcf | 2011-07-11 19:35:02 +0000 | [diff] [blame] | 1308 | |
| 1309 | // Deactivate all the partial cleanups in reverse order, which |
| 1310 | // generally means popping them. |
| 1311 | for (unsigned i = cleanups.size(); i != 0; --i) |
John McCall | 6f103ba | 2011-11-10 10:43:54 +0000 | [diff] [blame] | 1312 | CGF.DeactivateCleanupBlock(cleanups[i-1], cleanupDominator); |
| 1313 | |
| 1314 | // Destroy the placeholder if we made one. |
| 1315 | if (cleanupDominator) |
| 1316 | cleanupDominator->eraseFromParent(); |
Devang Patel | 636c3d0 | 2007-10-26 17:44:44 +0000 | [diff] [blame] | 1317 | } |
| 1318 | |
Pirama Arumuga Nainar | b6d6993 | 2015-07-01 12:25:36 -0700 | [diff] [blame] | 1319 | void AggExprEmitter::VisitDesignatedInitUpdateExpr(DesignatedInitUpdateExpr *E) { |
| 1320 | AggValueSlot Dest = EnsureSlot(E->getType()); |
| 1321 | |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 1322 | LValue DestLV = CGF.MakeAddrLValue(Dest.getAddress(), E->getType()); |
Pirama Arumuga Nainar | b6d6993 | 2015-07-01 12:25:36 -0700 | [diff] [blame] | 1323 | EmitInitializationToLValue(E->getBase(), DestLV); |
| 1324 | VisitInitListExpr(E->getUpdater()); |
| 1325 | } |
| 1326 | |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 1327 | //===----------------------------------------------------------------------===// |
| 1328 | // Entry Points into this File |
| 1329 | //===----------------------------------------------------------------------===// |
| 1330 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1331 | /// GetNumNonZeroBytesInInit - Get an approximate count of the number of |
| 1332 | /// non-zero bytes that will be stored when outputting the initializer for the |
| 1333 | /// specified initializer expression. |
Ken Dyck | 02c4533 | 2011-04-24 17:17:56 +0000 | [diff] [blame] | 1334 | static CharUnits GetNumNonZeroBytesInInit(const Expr *E, CodeGenFunction &CGF) { |
Peter Collingbourne | f111d93 | 2011-04-15 00:35:48 +0000 | [diff] [blame] | 1335 | E = E->IgnoreParens(); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1336 | |
| 1337 | // 0 and 0.0 won't require any non-zero stores! |
Ken Dyck | 02c4533 | 2011-04-24 17:17:56 +0000 | [diff] [blame] | 1338 | if (isSimpleZero(E, CGF)) return CharUnits::Zero(); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1339 | |
| 1340 | // If this is an initlist expr, sum up the size of sizes of the (present) |
| 1341 | // elements. If this is something weird, assume the whole thing is non-zero. |
| 1342 | const InitListExpr *ILE = dyn_cast<InitListExpr>(E); |
Stephen Hines | 6bcf27b | 2014-05-29 04:14:42 -0700 | [diff] [blame] | 1343 | if (!ILE || !CGF.getTypes().isZeroInitializable(ILE->getType())) |
Ken Dyck | 02c4533 | 2011-04-24 17:17:56 +0000 | [diff] [blame] | 1344 | return CGF.getContext().getTypeSizeInChars(E->getType()); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1345 | |
Chris Lattner | d1d56df | 2010-12-02 18:29:00 +0000 | [diff] [blame] | 1346 | // InitListExprs for structs have to be handled carefully. If there are |
| 1347 | // reference members, we need to consider the size of the reference, not the |
| 1348 | // referencee. InitListExprs for unions and arrays can't have references. |
Chris Lattner | 8c00ad1 | 2010-12-02 22:52:04 +0000 | [diff] [blame] | 1349 | if (const RecordType *RT = E->getType()->getAs<RecordType>()) { |
| 1350 | if (!RT->isUnionType()) { |
| 1351 | RecordDecl *SD = E->getType()->getAs<RecordType>()->getDecl(); |
Ken Dyck | 02c4533 | 2011-04-24 17:17:56 +0000 | [diff] [blame] | 1352 | CharUnits NumNonZeroBytes = CharUnits::Zero(); |
Chris Lattner | 8c00ad1 | 2010-12-02 22:52:04 +0000 | [diff] [blame] | 1353 | |
| 1354 | unsigned ILEElement = 0; |
Pirama Arumuga Nainar | 4967a71 | 2016-09-19 22:19:55 -0700 | [diff] [blame^] | 1355 | if (auto *CXXRD = dyn_cast<CXXRecordDecl>(SD)) |
| 1356 | while (ILEElement != CXXRD->getNumBases()) |
| 1357 | NumNonZeroBytes += |
| 1358 | GetNumNonZeroBytesInInit(ILE->getInit(ILEElement++), CGF); |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 1359 | for (const auto *Field : SD->fields()) { |
Chris Lattner | 8c00ad1 | 2010-12-02 22:52:04 +0000 | [diff] [blame] | 1360 | // We're done once we hit the flexible array member or run out of |
| 1361 | // InitListExpr elements. |
| 1362 | if (Field->getType()->isIncompleteArrayType() || |
| 1363 | ILEElement == ILE->getNumInits()) |
| 1364 | break; |
| 1365 | if (Field->isUnnamedBitfield()) |
| 1366 | continue; |
Chris Lattner | d1d56df | 2010-12-02 18:29:00 +0000 | [diff] [blame] | 1367 | |
Chris Lattner | 8c00ad1 | 2010-12-02 22:52:04 +0000 | [diff] [blame] | 1368 | const Expr *E = ILE->getInit(ILEElement++); |
| 1369 | |
| 1370 | // Reference values are always non-null and have the width of a pointer. |
| 1371 | if (Field->getType()->isReferenceType()) |
Ken Dyck | 02c4533 | 2011-04-24 17:17:56 +0000 | [diff] [blame] | 1372 | NumNonZeroBytes += CGF.getContext().toCharUnitsFromBits( |
John McCall | 64aa4b3 | 2013-04-16 22:48:15 +0000 | [diff] [blame] | 1373 | CGF.getTarget().getPointerWidth(0)); |
Chris Lattner | 8c00ad1 | 2010-12-02 22:52:04 +0000 | [diff] [blame] | 1374 | else |
| 1375 | NumNonZeroBytes += GetNumNonZeroBytesInInit(E, CGF); |
| 1376 | } |
Chris Lattner | d1d56df | 2010-12-02 18:29:00 +0000 | [diff] [blame] | 1377 | |
Chris Lattner | 8c00ad1 | 2010-12-02 22:52:04 +0000 | [diff] [blame] | 1378 | return NumNonZeroBytes; |
Chris Lattner | d1d56df | 2010-12-02 18:29:00 +0000 | [diff] [blame] | 1379 | } |
Chris Lattner | d1d56df | 2010-12-02 18:29:00 +0000 | [diff] [blame] | 1380 | } |
| 1381 | |
| 1382 | |
Ken Dyck | 02c4533 | 2011-04-24 17:17:56 +0000 | [diff] [blame] | 1383 | CharUnits NumNonZeroBytes = CharUnits::Zero(); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1384 | for (unsigned i = 0, e = ILE->getNumInits(); i != e; ++i) |
| 1385 | NumNonZeroBytes += GetNumNonZeroBytesInInit(ILE->getInit(i), CGF); |
| 1386 | return NumNonZeroBytes; |
| 1387 | } |
| 1388 | |
| 1389 | /// CheckAggExprForMemSetUse - If the initializer is large and has a lot of |
| 1390 | /// zeros in it, emit a memset and avoid storing the individual zeros. |
| 1391 | /// |
| 1392 | static void CheckAggExprForMemSetUse(AggValueSlot &Slot, const Expr *E, |
| 1393 | CodeGenFunction &CGF) { |
| 1394 | // If the slot is already known to be zeroed, nothing to do. Don't mess with |
| 1395 | // volatile stores. |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 1396 | if (Slot.isZeroed() || Slot.isVolatile() || !Slot.getAddress().isValid()) |
Stephen Hines | 6bcf27b | 2014-05-29 04:14:42 -0700 | [diff] [blame] | 1397 | return; |
Argyrios Kyrtzidis | 657baf1 | 2011-04-28 22:57:55 +0000 | [diff] [blame] | 1398 | |
| 1399 | // C++ objects with a user-declared constructor don't need zero'ing. |
Richard Smith | 7edf9e3 | 2012-11-01 22:30:59 +0000 | [diff] [blame] | 1400 | if (CGF.getLangOpts().CPlusPlus) |
Argyrios Kyrtzidis | 657baf1 | 2011-04-28 22:57:55 +0000 | [diff] [blame] | 1401 | if (const RecordType *RT = CGF.getContext() |
| 1402 | .getBaseElementType(E->getType())->getAs<RecordType>()) { |
| 1403 | const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); |
| 1404 | if (RD->hasUserDeclaredConstructor()) |
| 1405 | return; |
| 1406 | } |
| 1407 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1408 | // If the type is 16-bytes or smaller, prefer individual stores over memset. |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 1409 | CharUnits Size = CGF.getContext().getTypeSizeInChars(E->getType()); |
| 1410 | if (Size <= CharUnits::fromQuantity(16)) |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1411 | return; |
| 1412 | |
| 1413 | // Check to see if over 3/4 of the initializer are known to be zero. If so, |
| 1414 | // we prefer to emit memset + individual stores for the rest. |
Ken Dyck | 5ff1a35 | 2011-04-24 17:25:32 +0000 | [diff] [blame] | 1415 | CharUnits NumNonZeroBytes = GetNumNonZeroBytesInInit(E, CGF); |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 1416 | if (NumNonZeroBytes*4 > Size) |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1417 | return; |
| 1418 | |
| 1419 | // Okay, it seems like a good idea to use an initial memset, emit the call. |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 1420 | llvm::Constant *SizeVal = CGF.Builder.getInt64(Size.getQuantity()); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1421 | |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 1422 | Address Loc = Slot.getAddress(); |
| 1423 | Loc = CGF.Builder.CreateElementBitCast(Loc, CGF.Int8Ty); |
| 1424 | CGF.Builder.CreateMemSet(Loc, CGF.Builder.getInt8(0), SizeVal, false); |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1425 | |
| 1426 | // Tell the AggExprEmitter that the slot is known zero. |
| 1427 | Slot.setZeroed(); |
| 1428 | } |
| 1429 | |
| 1430 | |
| 1431 | |
| 1432 | |
Mike Stump | e1129a9 | 2009-05-26 18:57:45 +0000 | [diff] [blame] | 1433 | /// EmitAggExpr - Emit the computation of the specified expression of aggregate |
| 1434 | /// type. The result is computed into DestPtr. Note that if DestPtr is null, |
| 1435 | /// the value of the aggregate expression is not needed. If VolatileDest is |
| 1436 | /// true, DestPtr cannot be 0. |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 1437 | void CodeGenFunction::EmitAggExpr(const Expr *E, AggValueSlot Slot) { |
John McCall | 9d232c8 | 2013-03-07 21:37:08 +0000 | [diff] [blame] | 1438 | assert(E && hasAggregateEvaluationKind(E->getType()) && |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 1439 | "Invalid aggregate expression to emit"); |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 1440 | assert((Slot.getAddress().isValid() || Slot.isIgnored()) && |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1441 | "slot has bits but no address"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1442 | |
Chris Lattner | 1b72677 | 2010-12-02 07:07:26 +0000 | [diff] [blame] | 1443 | // Optimize the slot if possible. |
| 1444 | CheckAggExprForMemSetUse(Slot, E, *this); |
| 1445 | |
Pirama Arumuga Nainar | b6d6993 | 2015-07-01 12:25:36 -0700 | [diff] [blame] | 1446 | AggExprEmitter(*this, Slot, Slot.isIgnored()).Visit(const_cast<Expr*>(E)); |
Chris Lattner | ee755f9 | 2007-08-21 04:59:27 +0000 | [diff] [blame] | 1447 | } |
Daniel Dunbar | 7482d12 | 2008-09-09 20:49:46 +0000 | [diff] [blame] | 1448 | |
Daniel Dunbar | 18aba0d | 2010-02-05 19:38:31 +0000 | [diff] [blame] | 1449 | LValue CodeGenFunction::EmitAggExprToLValue(const Expr *E) { |
John McCall | 9d232c8 | 2013-03-07 21:37:08 +0000 | [diff] [blame] | 1450 | assert(hasAggregateEvaluationKind(E->getType()) && "Invalid argument!"); |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 1451 | Address Temp = CreateMemTemp(E->getType()); |
Daniel Dunbar | 79c3928 | 2010-08-21 03:15:20 +0000 | [diff] [blame] | 1452 | LValue LV = MakeAddrLValue(Temp, E->getType()); |
John McCall | 7c2349b | 2011-08-25 20:40:09 +0000 | [diff] [blame] | 1453 | EmitAggExpr(E, AggValueSlot::forLValue(LV, AggValueSlot::IsNotDestructed, |
John McCall | 4418439 | 2011-08-26 07:31:35 +0000 | [diff] [blame] | 1454 | AggValueSlot::DoesNotNeedGCBarriers, |
Chad Rosier | 649b4a1 | 2012-03-29 17:37:10 +0000 | [diff] [blame] | 1455 | AggValueSlot::IsNotAliased)); |
Daniel Dunbar | 79c3928 | 2010-08-21 03:15:20 +0000 | [diff] [blame] | 1456 | return LV; |
Daniel Dunbar | 18aba0d | 2010-02-05 19:38:31 +0000 | [diff] [blame] | 1457 | } |
| 1458 | |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 1459 | void CodeGenFunction::EmitAggregateCopy(Address DestPtr, |
| 1460 | Address SrcPtr, QualType Ty, |
John McCall | e0c1168 | 2012-07-02 23:58:38 +0000 | [diff] [blame] | 1461 | bool isVolatile, |
Benjamin Kramer | 6cacae8 | 2012-09-30 12:43:37 +0000 | [diff] [blame] | 1462 | bool isAssignment) { |
Chad Rosier | 649b4a1 | 2012-03-29 17:37:10 +0000 | [diff] [blame] | 1463 | assert(!Ty->isAnyComplexType() && "Shouldn't happen for complex"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1464 | |
Richard Smith | 7edf9e3 | 2012-11-01 22:30:59 +0000 | [diff] [blame] | 1465 | if (getLangOpts().CPlusPlus) { |
Chad Rosier | 649b4a1 | 2012-03-29 17:37:10 +0000 | [diff] [blame] | 1466 | if (const RecordType *RT = Ty->getAs<RecordType>()) { |
| 1467 | CXXRecordDecl *Record = cast<CXXRecordDecl>(RT->getDecl()); |
| 1468 | assert((Record->hasTrivialCopyConstructor() || |
| 1469 | Record->hasTrivialCopyAssignment() || |
| 1470 | Record->hasTrivialMoveConstructor() || |
Pirama Arumuga Nainar | b6d6993 | 2015-07-01 12:25:36 -0700 | [diff] [blame] | 1471 | Record->hasTrivialMoveAssignment() || |
| 1472 | Record->isUnion()) && |
Richard Smith | 426391c | 2012-11-16 00:53:38 +0000 | [diff] [blame] | 1473 | "Trying to aggregate-copy a type without a trivial copy/move " |
Douglas Gregor | e997948 | 2010-05-20 15:39:01 +0000 | [diff] [blame] | 1474 | "constructor or assignment operator"); |
Chad Rosier | 649b4a1 | 2012-03-29 17:37:10 +0000 | [diff] [blame] | 1475 | // Ignore empty classes in C++. |
| 1476 | if (Record->isEmpty()) |
Anders Carlsson | 0d7c583 | 2010-05-03 01:20:20 +0000 | [diff] [blame] | 1477 | return; |
| 1478 | } |
| 1479 | } |
| 1480 | |
Chris Lattner | 83c9629 | 2009-02-28 18:31:01 +0000 | [diff] [blame] | 1481 | // Aggregate assignment turns into llvm.memcpy. This is almost valid per |
Chris Lattner | ca4fc2c | 2009-02-28 18:18:58 +0000 | [diff] [blame] | 1482 | // C99 6.5.16.1p3, which states "If the value being stored in an object is |
| 1483 | // read from another object that overlaps in anyway the storage of the first |
| 1484 | // object, then the overlap shall be exact and the two objects shall have |
| 1485 | // qualified or unqualified versions of a compatible type." |
| 1486 | // |
Chris Lattner | 83c9629 | 2009-02-28 18:31:01 +0000 | [diff] [blame] | 1487 | // memcpy is not defined if the source and destination pointers are exactly |
Chris Lattner | ca4fc2c | 2009-02-28 18:18:58 +0000 | [diff] [blame] | 1488 | // equal, but other compilers do this optimization, and almost every memcpy |
| 1489 | // implementation handles this case safely. If there is a libc that does not |
| 1490 | // safely handle this, we can add a target hook. |
Chad Rosier | 649b4a1 | 2012-03-29 17:37:10 +0000 | [diff] [blame] | 1491 | |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 1492 | // Get data size info for this aggregate. If this is an assignment, |
| 1493 | // don't copy the tail padding, because we might be assigning into a |
| 1494 | // base subobject where the tail padding is claimed. Otherwise, |
| 1495 | // copying it is fine. |
Benjamin Kramer | 6cacae8 | 2012-09-30 12:43:37 +0000 | [diff] [blame] | 1496 | std::pair<CharUnits, CharUnits> TypeInfo; |
| 1497 | if (isAssignment) |
| 1498 | TypeInfo = getContext().getTypeInfoDataSizeInChars(Ty); |
| 1499 | else |
| 1500 | TypeInfo = getContext().getTypeInfoInChars(Ty); |
Chad Rosier | 649b4a1 | 2012-03-29 17:37:10 +0000 | [diff] [blame] | 1501 | |
Pirama Arumuga Nainar | b6d6993 | 2015-07-01 12:25:36 -0700 | [diff] [blame] | 1502 | llvm::Value *SizeVal = nullptr; |
| 1503 | if (TypeInfo.first.isZero()) { |
| 1504 | // But note that getTypeInfo returns 0 for a VLA. |
| 1505 | if (auto *VAT = dyn_cast_or_null<VariableArrayType>( |
| 1506 | getContext().getAsArrayType(Ty))) { |
| 1507 | QualType BaseEltTy; |
| 1508 | SizeVal = emitArrayLength(VAT, BaseEltTy, DestPtr); |
| 1509 | TypeInfo = getContext().getTypeInfoDataSizeInChars(BaseEltTy); |
| 1510 | std::pair<CharUnits, CharUnits> LastElementTypeInfo; |
| 1511 | if (!isAssignment) |
| 1512 | LastElementTypeInfo = getContext().getTypeInfoInChars(BaseEltTy); |
| 1513 | assert(!TypeInfo.first.isZero()); |
| 1514 | SizeVal = Builder.CreateNUWMul( |
| 1515 | SizeVal, |
| 1516 | llvm::ConstantInt::get(SizeTy, TypeInfo.first.getQuantity())); |
| 1517 | if (!isAssignment) { |
| 1518 | SizeVal = Builder.CreateNUWSub( |
| 1519 | SizeVal, |
| 1520 | llvm::ConstantInt::get(SizeTy, TypeInfo.first.getQuantity())); |
| 1521 | SizeVal = Builder.CreateNUWAdd( |
| 1522 | SizeVal, llvm::ConstantInt::get( |
| 1523 | SizeTy, LastElementTypeInfo.first.getQuantity())); |
| 1524 | } |
| 1525 | } |
| 1526 | } |
| 1527 | if (!SizeVal) { |
| 1528 | SizeVal = llvm::ConstantInt::get(SizeTy, TypeInfo.first.getQuantity()); |
| 1529 | } |
Chad Rosier | 649b4a1 | 2012-03-29 17:37:10 +0000 | [diff] [blame] | 1530 | |
| 1531 | // FIXME: If we have a volatile struct, the optimizer can remove what might |
| 1532 | // appear to be `extra' memory ops: |
| 1533 | // |
| 1534 | // volatile struct { int i; } a, b; |
| 1535 | // |
| 1536 | // int main() { |
| 1537 | // a = b; |
| 1538 | // a = b; |
| 1539 | // } |
| 1540 | // |
| 1541 | // we need to use a different call here. We use isVolatile to indicate when |
| 1542 | // either the source or the destination is volatile. |
| 1543 | |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 1544 | DestPtr = Builder.CreateElementBitCast(DestPtr, Int8Ty); |
| 1545 | SrcPtr = Builder.CreateElementBitCast(SrcPtr, Int8Ty); |
Chad Rosier | 649b4a1 | 2012-03-29 17:37:10 +0000 | [diff] [blame] | 1546 | |
| 1547 | // Don't do any of the memmove_collectable tests if GC isn't set. |
| 1548 | if (CGM.getLangOpts().getGC() == LangOptions::NonGC) { |
| 1549 | // fall through |
| 1550 | } else if (const RecordType *RecordTy = Ty->getAs<RecordType>()) { |
| 1551 | RecordDecl *Record = RecordTy->getDecl(); |
| 1552 | if (Record->hasObjectMember()) { |
Chad Rosier | 649b4a1 | 2012-03-29 17:37:10 +0000 | [diff] [blame] | 1553 | CGM.getObjCRuntime().EmitGCMemmoveCollectable(*this, DestPtr, SrcPtr, |
| 1554 | SizeVal); |
| 1555 | return; |
| 1556 | } |
| 1557 | } else if (Ty->isArrayType()) { |
| 1558 | QualType BaseType = getContext().getBaseElementType(Ty); |
| 1559 | if (const RecordType *RecordTy = BaseType->getAs<RecordType>()) { |
| 1560 | if (RecordTy->getDecl()->hasObjectMember()) { |
Chad Rosier | 649b4a1 | 2012-03-29 17:37:10 +0000 | [diff] [blame] | 1561 | CGM.getObjCRuntime().EmitGCMemmoveCollectable(*this, DestPtr, SrcPtr, |
| 1562 | SizeVal); |
| 1563 | return; |
| 1564 | } |
| 1565 | } |
| 1566 | } |
Dan Gohman | b22c7dc | 2012-09-28 21:58:29 +0000 | [diff] [blame] | 1567 | |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 1568 | auto Inst = Builder.CreateMemCpy(DestPtr, SrcPtr, SizeVal, isVolatile); |
| 1569 | |
Dan Gohman | b22c7dc | 2012-09-28 21:58:29 +0000 | [diff] [blame] | 1570 | // Determine the metadata to describe the position of any padding in this |
| 1571 | // memcpy, as well as the TBAA tags for the members of the struct, in case |
| 1572 | // the optimizer wishes to expand it in to scalar memory operations. |
Pirama Arumuga Nainar | 87d948e | 2016-03-03 15:49:35 -0800 | [diff] [blame] | 1573 | if (llvm::MDNode *TBAAStructTag = CGM.getTBAAStructInfo(Ty)) |
| 1574 | Inst->setMetadata(llvm::LLVMContext::MD_tbaa_struct, TBAAStructTag); |
Daniel Dunbar | 7482d12 | 2008-09-09 20:49:46 +0000 | [diff] [blame] | 1575 | } |