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Chris Lattner566b6ce2007-08-24 02:22:53 +00001//===--- CGExprAgg.cpp - Emit LLVM Code from Aggregate Expressions --------===//
Chris Lattneraf6f5282007-08-10 20:13:28 +00002//
3// The LLVM Compiler Infrastructure
4//
Chris Lattner0bc735f2007-12-29 19:59:25 +00005// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
Chris Lattneraf6f5282007-08-10 20:13:28 +00007//
8//===----------------------------------------------------------------------===//
9//
10// This contains code to emit Aggregate Expr nodes as LLVM code.
11//
12//===----------------------------------------------------------------------===//
13
14#include "CodeGenFunction.h"
Chris Lattner883f6a72007-08-11 00:04:45 +000015#include "CodeGenModule.h"
Fariborz Jahanian082b02e2009-07-08 01:18:33 +000016#include "CGObjCRuntime.h"
Daniel Dunbarde7fb842008-08-11 05:00:27 +000017#include "clang/AST/ASTContext.h"
Anders Carlssonb14095a2009-04-17 00:06:03 +000018#include "clang/AST/DeclCXX.h"
Daniel Dunbarde7fb842008-08-11 05:00:27 +000019#include "clang/AST/StmtVisitor.h"
Chris Lattner883f6a72007-08-11 00:04:45 +000020#include "llvm/Constants.h"
21#include "llvm/Function.h"
Devang Patel636c3d02007-10-26 17:44:44 +000022#include "llvm/GlobalVariable.h"
Chris Lattner9c033562007-08-21 04:25:47 +000023#include "llvm/Support/Compiler.h"
Chris Lattnerf81557c2008-04-04 18:42:16 +000024#include "llvm/Intrinsics.h"
Chris Lattneraf6f5282007-08-10 20:13:28 +000025using namespace clang;
26using namespace CodeGen;
Chris Lattner883f6a72007-08-11 00:04:45 +000027
Chris Lattner9c033562007-08-21 04:25:47 +000028//===----------------------------------------------------------------------===//
29// Aggregate Expression Emitter
30//===----------------------------------------------------------------------===//
31
32namespace {
33class VISIBILITY_HIDDEN AggExprEmitter : public StmtVisitor<AggExprEmitter> {
34 CodeGenFunction &CGF;
Daniel Dunbar45d196b2008-11-01 01:53:16 +000035 CGBuilderTy &Builder;
Chris Lattner9c033562007-08-21 04:25:47 +000036 llvm::Value *DestPtr;
37 bool VolatileDest;
Mike Stump49d1cd52009-05-26 22:03:21 +000038 bool IgnoreResult;
Anders Carlsson14c5cbf2009-08-16 07:36:22 +000039 bool IsInitializer;
Fariborz Jahanian08c32132009-08-31 19:33:16 +000040 bool RequiresGCollection;
Chris Lattner9c033562007-08-21 04:25:47 +000041public:
Mike Stumpff4bf3b2009-05-27 01:42:21 +000042 AggExprEmitter(CodeGenFunction &cgf, llvm::Value *destPtr, bool v,
Fariborz Jahanian08c32132009-08-31 19:33:16 +000043 bool ignore, bool isinit, bool requiresGCollection)
Chris Lattnerbfc0c1a2007-08-26 23:13:56 +000044 : CGF(cgf), Builder(CGF.Builder),
Anders Carlsson14c5cbf2009-08-16 07:36:22 +000045 DestPtr(destPtr), VolatileDest(v), IgnoreResult(ignore),
Fariborz Jahanian08c32132009-08-31 19:33:16 +000046 IsInitializer(isinit), RequiresGCollection(requiresGCollection) {
Chris Lattner9c033562007-08-21 04:25:47 +000047 }
48
Chris Lattneree755f92007-08-21 04:59:27 +000049 //===--------------------------------------------------------------------===//
50 // Utilities
51 //===--------------------------------------------------------------------===//
52
Chris Lattner9c033562007-08-21 04:25:47 +000053 /// EmitAggLoadOfLValue - Given an expression with aggregate type that
54 /// represents a value lvalue, this method emits the address of the lvalue,
55 /// then loads the result into DestPtr.
56 void EmitAggLoadOfLValue(const Expr *E);
Eli Friedman922696f2008-05-19 17:51:16 +000057
Mike Stump4ac20dd2009-05-23 20:28:01 +000058 /// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired.
Mike Stump49d1cd52009-05-26 22:03:21 +000059 void EmitFinalDestCopy(const Expr *E, LValue Src, bool Ignore = false);
60 void EmitFinalDestCopy(const Expr *E, RValue Src, bool Ignore = false);
Mike Stump4ac20dd2009-05-23 20:28:01 +000061
Chris Lattneree755f92007-08-21 04:59:27 +000062 //===--------------------------------------------------------------------===//
63 // Visitor Methods
64 //===--------------------------------------------------------------------===//
Mike Stump1eb44332009-09-09 15:08:12 +000065
Chris Lattner9c033562007-08-21 04:25:47 +000066 void VisitStmt(Stmt *S) {
Daniel Dunbar488e9932008-08-16 00:56:44 +000067 CGF.ErrorUnsupported(S, "aggregate expression");
Chris Lattner9c033562007-08-21 04:25:47 +000068 }
69 void VisitParenExpr(ParenExpr *PE) { Visit(PE->getSubExpr()); }
Eli Friedman12444a22009-01-27 09:03:41 +000070 void VisitUnaryExtension(UnaryOperator *E) { Visit(E->getSubExpr()); }
Chris Lattner9c033562007-08-21 04:25:47 +000071
72 // l-values.
Seo Sanghyeon9b73b392007-12-14 02:04:12 +000073 void VisitDeclRefExpr(DeclRefExpr *DRE) { EmitAggLoadOfLValue(DRE); }
74 void VisitMemberExpr(MemberExpr *ME) { EmitAggLoadOfLValue(ME); }
75 void VisitUnaryDeref(UnaryOperator *E) { EmitAggLoadOfLValue(E); }
Seo Sanghyeonad6ebd62007-12-23 03:11:58 +000076 void VisitStringLiteral(StringLiteral *E) { EmitAggLoadOfLValue(E); }
Chris Lattnerf0a990c2009-04-21 23:00:09 +000077 void VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {
Mike Stump1eb44332009-09-09 15:08:12 +000078 EmitAggLoadOfLValue(E);
Chris Lattnerf0a990c2009-04-21 23:00:09 +000079 }
Seo Sanghyeon9b73b392007-12-14 02:04:12 +000080 void VisitArraySubscriptExpr(ArraySubscriptExpr *E) {
81 EmitAggLoadOfLValue(E);
82 }
Chris Lattnerf0a990c2009-04-21 23:00:09 +000083 void VisitBlockDeclRefExpr(const BlockDeclRefExpr *E) {
Mike Stump1eb44332009-09-09 15:08:12 +000084 EmitAggLoadOfLValue(E);
Chris Lattnerf0a990c2009-04-21 23:00:09 +000085 }
86 void VisitPredefinedExpr(const PredefinedExpr *E) {
Mike Stump1eb44332009-09-09 15:08:12 +000087 EmitAggLoadOfLValue(E);
Chris Lattnerf0a990c2009-04-21 23:00:09 +000088 }
Mike Stump1eb44332009-09-09 15:08:12 +000089
Chris Lattner9c033562007-08-21 04:25:47 +000090 // Operators.
Anders Carlsson4d8673b2009-08-07 23:22:37 +000091 void VisitCastExpr(CastExpr *E);
Anders Carlsson148fe672007-10-31 22:04:46 +000092 void VisitCallExpr(const CallExpr *E);
Chris Lattnerb2d963f2007-08-31 22:54:14 +000093 void VisitStmtExpr(const StmtExpr *E);
Chris Lattner9c033562007-08-21 04:25:47 +000094 void VisitBinaryOperator(const BinaryOperator *BO);
Fariborz Jahanian8bfd31f2009-10-22 22:57:31 +000095 void VisitPointerToDataMemberBinaryOperator(const BinaryOperator *BO);
Chris Lattner03d6fb92007-08-21 04:43:17 +000096 void VisitBinAssign(const BinaryOperator *E);
Eli Friedman07fa52a2008-05-20 07:56:31 +000097 void VisitBinComma(const BinaryOperator *E);
Anders Carlssona024d172009-10-03 15:43:24 +000098 void VisitUnaryAddrOf(const UnaryOperator *E);
Chris Lattner9c033562007-08-21 04:25:47 +000099
Chris Lattner8fdf3282008-06-24 17:04:18 +0000100 void VisitObjCMessageExpr(ObjCMessageExpr *E);
Daniel Dunbar0a04d772008-08-23 10:51:21 +0000101 void VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
102 EmitAggLoadOfLValue(E);
103 }
Daniel Dunbar9c3fc702008-08-27 06:57:25 +0000104 void VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E);
Fariborz Jahanian09105f52009-08-20 17:02:02 +0000105 void VisitObjCImplicitSetterGetterRefExpr(ObjCImplicitSetterGetterRefExpr *E);
Mike Stump1eb44332009-09-09 15:08:12 +0000106
Chris Lattner9c033562007-08-21 04:25:47 +0000107 void VisitConditionalOperator(const ConditionalOperator *CO);
Anders Carlssona294ca82009-07-08 18:33:14 +0000108 void VisitChooseExpr(const ChooseExpr *CE);
Devang Patel636c3d02007-10-26 17:44:44 +0000109 void VisitInitListExpr(InitListExpr *E);
Chris Lattner04421082008-04-08 04:40:51 +0000110 void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
111 Visit(DAE->getExpr());
112 }
Anders Carlssonb58d0172009-05-30 23:23:33 +0000113 void VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E);
Anders Carlsson31ccf372009-05-03 17:47:16 +0000114 void VisitCXXConstructExpr(const CXXConstructExpr *E);
Anders Carlsson7f6ad152009-05-19 04:48:36 +0000115 void VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E);
Nuno Lopes329763b2009-10-18 15:18:11 +0000116 void VisitCXXZeroInitValueExpr(CXXZeroInitValueExpr *E);
Mike Stump2710c412009-11-18 00:40:12 +0000117 void VisitCXXTypeidExpr(CXXTypeidExpr *E) { EmitAggLoadOfLValue(E); }
Anders Carlsson7f6ad152009-05-19 04:48:36 +0000118
Eli Friedmanb1851242008-05-27 15:51:49 +0000119 void VisitVAArgExpr(VAArgExpr *E);
Chris Lattnerf81557c2008-04-04 18:42:16 +0000120
121 void EmitInitializationToLValue(Expr *E, LValue Address);
122 void EmitNullInitializationToLValue(LValue Address, QualType T);
Chris Lattner9c033562007-08-21 04:25:47 +0000123 // case Expr::ChooseExprClass:
Lauro Ramos Venancio305762c2008-02-18 22:44:02 +0000124
Chris Lattner9c033562007-08-21 04:25:47 +0000125};
126} // end anonymous namespace.
127
Chris Lattneree755f92007-08-21 04:59:27 +0000128//===----------------------------------------------------------------------===//
129// Utilities
130//===----------------------------------------------------------------------===//
Chris Lattner9c033562007-08-21 04:25:47 +0000131
Chris Lattner883f6a72007-08-11 00:04:45 +0000132/// EmitAggLoadOfLValue - Given an expression with aggregate type that
133/// represents a value lvalue, this method emits the address of the lvalue,
134/// then loads the result into DestPtr.
Chris Lattner9c033562007-08-21 04:25:47 +0000135void AggExprEmitter::EmitAggLoadOfLValue(const Expr *E) {
136 LValue LV = CGF.EmitLValue(E);
Mike Stump4ac20dd2009-05-23 20:28:01 +0000137 EmitFinalDestCopy(E, LV);
138}
139
140/// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired.
Mike Stump49d1cd52009-05-26 22:03:21 +0000141void AggExprEmitter::EmitFinalDestCopy(const Expr *E, RValue Src, bool Ignore) {
Mike Stump4ac20dd2009-05-23 20:28:01 +0000142 assert(Src.isAggregate() && "value must be aggregate value!");
143
Chris Lattner883f6a72007-08-11 00:04:45 +0000144 // If the result is ignored, don't copy from the value.
Mike Stump9ccb1032009-05-23 22:01:27 +0000145 if (DestPtr == 0) {
Mike Stump49d1cd52009-05-26 22:03:21 +0000146 if (!Src.isVolatileQualified() || (IgnoreResult && Ignore))
Mike Stump9ccb1032009-05-23 22:01:27 +0000147 return;
Mike Stump49d1cd52009-05-26 22:03:21 +0000148 // If the source is volatile, we must read from it; to do that, we need
149 // some place to put it.
150 DestPtr = CGF.CreateTempAlloca(CGF.ConvertType(E->getType()), "agg.tmp");
Mike Stump9ccb1032009-05-23 22:01:27 +0000151 }
Chris Lattner883f6a72007-08-11 00:04:45 +0000152
Fariborz Jahanian08c32132009-08-31 19:33:16 +0000153 if (RequiresGCollection) {
154 CGF.CGM.getObjCRuntime().EmitGCMemmoveCollectable(CGF,
155 DestPtr, Src.getAggregateAddr(),
156 E->getType());
157 return;
158 }
Mike Stump4ac20dd2009-05-23 20:28:01 +0000159 // If the result of the assignment is used, copy the LHS there also.
160 // FIXME: Pass VolatileDest as well. I think we also need to merge volatile
161 // from the source as well, as we can't eliminate it if either operand
162 // is volatile, unless copy has volatile for both source and destination..
Mike Stump27fe2e62009-05-23 22:29:41 +0000163 CGF.EmitAggregateCopy(DestPtr, Src.getAggregateAddr(), E->getType(),
164 VolatileDest|Src.isVolatileQualified());
Mike Stump4ac20dd2009-05-23 20:28:01 +0000165}
166
167/// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired.
Mike Stump49d1cd52009-05-26 22:03:21 +0000168void AggExprEmitter::EmitFinalDestCopy(const Expr *E, LValue Src, bool Ignore) {
Mike Stump4ac20dd2009-05-23 20:28:01 +0000169 assert(Src.isSimple() && "Can't have aggregate bitfield, vector, etc");
170
171 EmitFinalDestCopy(E, RValue::getAggregate(Src.getAddress(),
Mike Stump49d1cd52009-05-26 22:03:21 +0000172 Src.isVolatileQualified()),
173 Ignore);
Chris Lattner883f6a72007-08-11 00:04:45 +0000174}
175
Chris Lattneree755f92007-08-21 04:59:27 +0000176//===----------------------------------------------------------------------===//
177// Visitor Methods
178//===----------------------------------------------------------------------===//
179
Anders Carlsson4d8673b2009-08-07 23:22:37 +0000180void AggExprEmitter::VisitCastExpr(CastExpr *E) {
Anders Carlsson30168422009-09-29 01:23:39 +0000181 switch (E->getCastKind()) {
182 default: assert(0 && "Unhandled cast kind!");
183
184 case CastExpr::CK_ToUnion: {
Anders Carlsson4d8673b2009-08-07 23:22:37 +0000185 // GCC union extension
Eli Friedman34ebf4d2009-06-03 20:45:06 +0000186 QualType PtrTy =
Anders Carlsson30168422009-09-29 01:23:39 +0000187 CGF.getContext().getPointerType(E->getSubExpr()->getType());
Eli Friedman34ebf4d2009-06-03 20:45:06 +0000188 llvm::Value *CastPtr = Builder.CreateBitCast(DestPtr,
189 CGF.ConvertType(PtrTy));
Mon P Wangc6a38a42009-07-22 03:08:17 +0000190 EmitInitializationToLValue(E->getSubExpr(),
John McCall0953e762009-09-24 19:53:00 +0000191 LValue::MakeAddr(CastPtr, Qualifiers()));
Anders Carlsson30168422009-09-29 01:23:39 +0000192 break;
Nuno Lopes7e916272009-01-15 20:14:33 +0000193 }
Mike Stump1eb44332009-09-09 15:08:12 +0000194
Anders Carlsson4d8673b2009-08-07 23:22:37 +0000195 // FIXME: Remove the CK_Unknown check here.
Anders Carlsson30168422009-09-29 01:23:39 +0000196 case CastExpr::CK_Unknown:
197 case CastExpr::CK_NoOp:
198 case CastExpr::CK_UserDefinedConversion:
199 case CastExpr::CK_ConstructorConversion:
200 assert(CGF.getContext().hasSameUnqualifiedType(E->getSubExpr()->getType(),
201 E->getType()) &&
202 "Implicit cast types must be compatible");
203 Visit(E->getSubExpr());
204 break;
Anders Carlssone9d34dc2009-09-29 02:09:01 +0000205
206 case CastExpr::CK_NullToMemberPointer: {
Anders Carlssone9d34dc2009-09-29 02:09:01 +0000207 const llvm::Type *PtrDiffTy =
208 CGF.ConvertType(CGF.getContext().getPointerDiffType());
209
210 llvm::Value *NullValue = llvm::Constant::getNullValue(PtrDiffTy);
211 llvm::Value *Ptr = Builder.CreateStructGEP(DestPtr, 0, "ptr");
212 Builder.CreateStore(NullValue, Ptr, VolatileDest);
213
214 llvm::Value *Adj = Builder.CreateStructGEP(DestPtr, 1, "adj");
215 Builder.CreateStore(NullValue, Adj, VolatileDest);
216
217 break;
218 }
Anders Carlsson84080ec2009-09-29 03:13:20 +0000219
Anders Carlssonbb378cb2009-10-18 20:31:03 +0000220 case CastExpr::CK_BitCast: {
221 // This must be a member function pointer cast.
222 Visit(E->getSubExpr());
223 break;
224 }
225
Eli Friedmanc6fdb7762009-11-27 04:46:20 +0000226 case CastExpr::CK_DerivedToBaseMemberPointer:
Anders Carlsson84080ec2009-09-29 03:13:20 +0000227 case CastExpr::CK_BaseToDerivedMemberPointer: {
228 QualType SrcType = E->getSubExpr()->getType();
229
230 llvm::Value *Src = CGF.CreateTempAlloca(CGF.ConvertTypeForMem(SrcType),
231 "tmp");
232 CGF.EmitAggExpr(E->getSubExpr(), Src, SrcType.isVolatileQualified());
233
234 llvm::Value *SrcPtr = Builder.CreateStructGEP(Src, 0, "src.ptr");
235 SrcPtr = Builder.CreateLoad(SrcPtr);
236
237 llvm::Value *SrcAdj = Builder.CreateStructGEP(Src, 1, "src.adj");
238 SrcAdj = Builder.CreateLoad(SrcAdj);
239
240 llvm::Value *DstPtr = Builder.CreateStructGEP(DestPtr, 0, "dst.ptr");
241 Builder.CreateStore(SrcPtr, DstPtr, VolatileDest);
242
243 llvm::Value *DstAdj = Builder.CreateStructGEP(DestPtr, 1, "dst.adj");
244
245 // Now See if we need to update the adjustment.
Eli Friedmanc6fdb7762009-11-27 04:46:20 +0000246 const CXXRecordDecl *BaseDecl =
Anders Carlsson84080ec2009-09-29 03:13:20 +0000247 cast<CXXRecordDecl>(SrcType->getAs<MemberPointerType>()->
248 getClass()->getAs<RecordType>()->getDecl());
Eli Friedmanc6fdb7762009-11-27 04:46:20 +0000249 const CXXRecordDecl *DerivedDecl =
Anders Carlsson84080ec2009-09-29 03:13:20 +0000250 cast<CXXRecordDecl>(E->getType()->getAs<MemberPointerType>()->
251 getClass()->getAs<RecordType>()->getDecl());
Eli Friedmanc6fdb7762009-11-27 04:46:20 +0000252 if (E->getCastKind() == CastExpr::CK_DerivedToBaseMemberPointer)
253 std::swap(DerivedDecl, BaseDecl);
254
255 llvm::Constant *Adj = CGF.CGM.GetCXXBaseClassOffset(DerivedDecl, BaseDecl);
256 if (Adj) {
257 if (E->getCastKind() == CastExpr::CK_DerivedToBaseMemberPointer)
258 SrcAdj = Builder.CreateSub(SrcAdj, Adj, "adj");
259 else
260 SrcAdj = Builder.CreateAdd(SrcAdj, Adj, "adj");
261 }
Anders Carlsson84080ec2009-09-29 03:13:20 +0000262
263 Builder.CreateStore(SrcAdj, DstAdj, VolatileDest);
264 break;
265 }
Anders Carlsson30168422009-09-29 01:23:39 +0000266 }
Anders Carlssone4707ff2008-01-14 06:28:57 +0000267}
268
Chris Lattner96196622008-07-26 22:37:01 +0000269void AggExprEmitter::VisitCallExpr(const CallExpr *E) {
Anders Carlssone70e8f72009-05-27 16:45:02 +0000270 if (E->getCallReturnType()->isReferenceType()) {
271 EmitAggLoadOfLValue(E);
272 return;
273 }
Mike Stump1eb44332009-09-09 15:08:12 +0000274
Anders Carlsson148fe672007-10-31 22:04:46 +0000275 RValue RV = CGF.EmitCallExpr(E);
Mike Stump4ac20dd2009-05-23 20:28:01 +0000276 EmitFinalDestCopy(E, RV);
Anders Carlsson148fe672007-10-31 22:04:46 +0000277}
Chris Lattner96196622008-07-26 22:37:01 +0000278
279void AggExprEmitter::VisitObjCMessageExpr(ObjCMessageExpr *E) {
Daniel Dunbar8f2926b2008-08-23 03:46:30 +0000280 RValue RV = CGF.EmitObjCMessageExpr(E);
Mike Stump4ac20dd2009-05-23 20:28:01 +0000281 EmitFinalDestCopy(E, RV);
Chris Lattner8fdf3282008-06-24 17:04:18 +0000282}
Anders Carlsson148fe672007-10-31 22:04:46 +0000283
Daniel Dunbar9c3fc702008-08-27 06:57:25 +0000284void AggExprEmitter::VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E) {
285 RValue RV = CGF.EmitObjCPropertyGet(E);
Mike Stump4ac20dd2009-05-23 20:28:01 +0000286 EmitFinalDestCopy(E, RV);
Daniel Dunbar9c3fc702008-08-27 06:57:25 +0000287}
288
Fariborz Jahanian09105f52009-08-20 17:02:02 +0000289void AggExprEmitter::VisitObjCImplicitSetterGetterRefExpr(
290 ObjCImplicitSetterGetterRefExpr *E) {
Fariborz Jahanian5daf5702008-11-22 18:39:36 +0000291 RValue RV = CGF.EmitObjCPropertyGet(E);
Mike Stump4ac20dd2009-05-23 20:28:01 +0000292 EmitFinalDestCopy(E, RV);
Fariborz Jahanian5daf5702008-11-22 18:39:36 +0000293}
294
Chris Lattner96196622008-07-26 22:37:01 +0000295void AggExprEmitter::VisitBinComma(const BinaryOperator *E) {
Mike Stump7f79f9b2009-05-29 15:46:01 +0000296 CGF.EmitAnyExpr(E->getLHS(), 0, false, true);
Anders Carlsson14c5cbf2009-08-16 07:36:22 +0000297 CGF.EmitAggExpr(E->getRHS(), DestPtr, VolatileDest,
298 /*IgnoreResult=*/false, IsInitializer);
Eli Friedman07fa52a2008-05-20 07:56:31 +0000299}
300
Anders Carlssona024d172009-10-03 15:43:24 +0000301void AggExprEmitter::VisitUnaryAddrOf(const UnaryOperator *E) {
302 // We have a member function pointer.
303 const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>();
Daniel Dunbarbabac132009-10-17 09:39:30 +0000304 (void) MPT;
Anders Carlssona024d172009-10-03 15:43:24 +0000305 assert(MPT->getPointeeType()->isFunctionProtoType() &&
306 "Unexpected member pointer type!");
307
Douglas Gregora2813ce2009-10-23 18:54:35 +0000308 const DeclRefExpr *DRE = cast<DeclRefExpr>(E->getSubExpr());
Anders Carlssona024d172009-10-03 15:43:24 +0000309 const CXXMethodDecl *MD = cast<CXXMethodDecl>(DRE->getDecl());
310
311 const llvm::Type *PtrDiffTy =
312 CGF.ConvertType(CGF.getContext().getPointerDiffType());
313
314 llvm::Value *DstPtr = Builder.CreateStructGEP(DestPtr, 0, "dst.ptr");
315 llvm::Value *FuncPtr;
316
317 if (MD->isVirtual()) {
Anders Carlssondbd920c2009-10-11 22:13:54 +0000318 int64_t Index =
319 CGF.CGM.getVtableInfo().getMethodVtableIndex(MD);
Anders Carlssona024d172009-10-03 15:43:24 +0000320
321 FuncPtr = llvm::ConstantInt::get(PtrDiffTy, Index + 1);
322 } else {
323 FuncPtr = llvm::ConstantExpr::getPtrToInt(CGF.CGM.GetAddrOfFunction(MD),
324 PtrDiffTy);
325 }
326 Builder.CreateStore(FuncPtr, DstPtr, VolatileDest);
327
328 llvm::Value *AdjPtr = Builder.CreateStructGEP(DestPtr, 1, "dst.adj");
329
330 // The adjustment will always be 0.
331 Builder.CreateStore(llvm::ConstantInt::get(PtrDiffTy, 0), AdjPtr,
332 VolatileDest);
333}
334
Chris Lattnerb2d963f2007-08-31 22:54:14 +0000335void AggExprEmitter::VisitStmtExpr(const StmtExpr *E) {
336 CGF.EmitCompoundStmt(*E->getSubStmt(), true, DestPtr, VolatileDest);
337}
338
Chris Lattner9c033562007-08-21 04:25:47 +0000339void AggExprEmitter::VisitBinaryOperator(const BinaryOperator *E) {
Fariborz Jahanian52f08bc2009-10-26 21:58:25 +0000340 if (E->getOpcode() == BinaryOperator::PtrMemD ||
341 E->getOpcode() == BinaryOperator::PtrMemI)
Fariborz Jahanian8bfd31f2009-10-22 22:57:31 +0000342 VisitPointerToDataMemberBinaryOperator(E);
343 else
344 CGF.ErrorUnsupported(E, "aggregate binary expression");
345}
346
347void AggExprEmitter::VisitPointerToDataMemberBinaryOperator(
348 const BinaryOperator *E) {
349 LValue LV = CGF.EmitPointerToDataMemberBinaryExpr(E);
350 EmitFinalDestCopy(E, LV);
Chris Lattneree755f92007-08-21 04:59:27 +0000351}
352
Chris Lattner03d6fb92007-08-21 04:43:17 +0000353void AggExprEmitter::VisitBinAssign(const BinaryOperator *E) {
Eli Friedmanff6e2b72008-02-11 01:09:17 +0000354 // For an assignment to work, the value on the right has
355 // to be compatible with the value on the left.
Eli Friedman2dce5f82009-05-28 23:04:00 +0000356 assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(),
357 E->getRHS()->getType())
Eli Friedmanff6e2b72008-02-11 01:09:17 +0000358 && "Invalid assignment");
Chris Lattner9c033562007-08-21 04:25:47 +0000359 LValue LHS = CGF.EmitLValue(E->getLHS());
Chris Lattner883f6a72007-08-11 00:04:45 +0000360
Daniel Dunbar7f8ea5c2008-08-30 05:35:15 +0000361 // We have to special case property setters, otherwise we must have
362 // a simple lvalue (no aggregates inside vectors, bitfields).
363 if (LHS.isPropertyRef()) {
Daniel Dunbar7f8ea5c2008-08-30 05:35:15 +0000364 llvm::Value *AggLoc = DestPtr;
365 if (!AggLoc)
366 AggLoc = CGF.CreateTempAlloca(CGF.ConvertType(E->getRHS()->getType()));
Mike Stump240993d2009-05-23 23:48:13 +0000367 CGF.EmitAggExpr(E->getRHS(), AggLoc, VolatileDest);
Mike Stump1eb44332009-09-09 15:08:12 +0000368 CGF.EmitObjCPropertySet(LHS.getPropertyRefExpr(),
Mike Stump240993d2009-05-23 23:48:13 +0000369 RValue::getAggregate(AggLoc, VolatileDest));
Mike Stumpb3589f42009-07-30 22:28:39 +0000370 } else if (LHS.isKVCRef()) {
Fariborz Jahanian43f44702008-11-22 22:30:21 +0000371 llvm::Value *AggLoc = DestPtr;
372 if (!AggLoc)
373 AggLoc = CGF.CreateTempAlloca(CGF.ConvertType(E->getRHS()->getType()));
Mike Stumpa49af1a2009-05-23 23:52:31 +0000374 CGF.EmitAggExpr(E->getRHS(), AggLoc, VolatileDest);
Mike Stump1eb44332009-09-09 15:08:12 +0000375 CGF.EmitObjCPropertySet(LHS.getKVCRefExpr(),
Mike Stumpa49af1a2009-05-23 23:52:31 +0000376 RValue::getAggregate(AggLoc, VolatileDest));
Daniel Dunbar7f8ea5c2008-08-30 05:35:15 +0000377 } else {
Fariborz Jahanian08c32132009-08-31 19:33:16 +0000378 bool RequiresGCollection = false;
Fariborz Jahanian082b02e2009-07-08 01:18:33 +0000379 if (CGF.getContext().getLangOptions().NeXTRuntime) {
380 QualType LHSTy = E->getLHS()->getType();
Ted Kremenek6217b802009-07-29 21:53:49 +0000381 if (const RecordType *FDTTy = LHSTy.getTypePtr()->getAs<RecordType>())
Mike Stump1eb44332009-09-09 15:08:12 +0000382 RequiresGCollection = FDTTy->getDecl()->hasObjectMember();
Fariborz Jahanian082b02e2009-07-08 01:18:33 +0000383 }
Daniel Dunbar7f8ea5c2008-08-30 05:35:15 +0000384 // Codegen the RHS so that it stores directly into the LHS.
Fariborz Jahanian08c32132009-08-31 19:33:16 +0000385 CGF.EmitAggExpr(E->getRHS(), LHS.getAddress(), LHS.isVolatileQualified(),
386 false, false, RequiresGCollection);
Mike Stump49d1cd52009-05-26 22:03:21 +0000387 EmitFinalDestCopy(E, LHS, true);
Daniel Dunbar7f8ea5c2008-08-30 05:35:15 +0000388 }
Chris Lattner883f6a72007-08-11 00:04:45 +0000389}
390
Chris Lattner9c033562007-08-21 04:25:47 +0000391void AggExprEmitter::VisitConditionalOperator(const ConditionalOperator *E) {
Daniel Dunbar9615ecb2008-11-13 01:38:36 +0000392 llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
393 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
394 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
Mike Stump1eb44332009-09-09 15:08:12 +0000395
Chris Lattner9c033562007-08-21 04:25:47 +0000396 llvm::Value *Cond = CGF.EvaluateExprAsBool(E->getCond());
Chris Lattnerbfc0c1a2007-08-26 23:13:56 +0000397 Builder.CreateCondBr(Cond, LHSBlock, RHSBlock);
Mike Stump1eb44332009-09-09 15:08:12 +0000398
Anders Carlssona36bf8f2009-11-20 17:27:56 +0000399 CGF.StartConditionalBranch();
Chris Lattner9c033562007-08-21 04:25:47 +0000400 CGF.EmitBlock(LHSBlock);
Mike Stump1eb44332009-09-09 15:08:12 +0000401
Chris Lattner883f6a72007-08-11 00:04:45 +0000402 // Handle the GNU extension for missing LHS.
403 assert(E->getLHS() && "Must have LHS for aggregate value");
404
Chris Lattnerc748f272007-08-21 05:02:10 +0000405 Visit(E->getLHS());
Anders Carlssona36bf8f2009-11-20 17:27:56 +0000406 CGF.FinishConditionalBranch();
Daniel Dunbard57a8712008-11-11 09:41:28 +0000407 CGF.EmitBranch(ContBlock);
Mike Stump1eb44332009-09-09 15:08:12 +0000408
Anders Carlssona36bf8f2009-11-20 17:27:56 +0000409 CGF.StartConditionalBranch();
Chris Lattner9c033562007-08-21 04:25:47 +0000410 CGF.EmitBlock(RHSBlock);
Mike Stump1eb44332009-09-09 15:08:12 +0000411
Chris Lattnerc748f272007-08-21 05:02:10 +0000412 Visit(E->getRHS());
Anders Carlssona36bf8f2009-11-20 17:27:56 +0000413 CGF.FinishConditionalBranch();
Daniel Dunbard57a8712008-11-11 09:41:28 +0000414 CGF.EmitBranch(ContBlock);
Mike Stump1eb44332009-09-09 15:08:12 +0000415
Chris Lattner9c033562007-08-21 04:25:47 +0000416 CGF.EmitBlock(ContBlock);
Chris Lattner883f6a72007-08-11 00:04:45 +0000417}
Chris Lattneree755f92007-08-21 04:59:27 +0000418
Anders Carlssona294ca82009-07-08 18:33:14 +0000419void AggExprEmitter::VisitChooseExpr(const ChooseExpr *CE) {
420 Visit(CE->getChosenSubExpr(CGF.getContext()));
421}
422
Eli Friedmanb1851242008-05-27 15:51:49 +0000423void AggExprEmitter::VisitVAArgExpr(VAArgExpr *VE) {
Daniel Dunbar07855702009-02-11 22:25:55 +0000424 llvm::Value *ArgValue = CGF.EmitVAListRef(VE->getSubExpr());
Anders Carlssonddf7cac2008-11-04 05:30:00 +0000425 llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, VE->getType());
426
Sebastian Redl0262f022009-01-09 21:09:38 +0000427 if (!ArgPtr) {
Anders Carlssonddf7cac2008-11-04 05:30:00 +0000428 CGF.ErrorUnsupported(VE, "aggregate va_arg expression");
Sebastian Redl0262f022009-01-09 21:09:38 +0000429 return;
430 }
431
John McCall0953e762009-09-24 19:53:00 +0000432 EmitFinalDestCopy(VE, LValue::MakeAddr(ArgPtr, Qualifiers()));
Eli Friedmanb1851242008-05-27 15:51:49 +0000433}
434
Anders Carlssonb58d0172009-05-30 23:23:33 +0000435void AggExprEmitter::VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) {
436 llvm::Value *Val = DestPtr;
Mike Stump1eb44332009-09-09 15:08:12 +0000437
Anders Carlssonb58d0172009-05-30 23:23:33 +0000438 if (!Val) {
439 // Create a temporary variable.
440 Val = CGF.CreateTempAlloca(CGF.ConvertTypeForMem(E->getType()), "tmp");
441
442 // FIXME: volatile
443 CGF.EmitAggExpr(E->getSubExpr(), Val, false);
Mike Stump1eb44332009-09-09 15:08:12 +0000444 } else
Anders Carlssonb58d0172009-05-30 23:23:33 +0000445 Visit(E->getSubExpr());
Mike Stump1eb44332009-09-09 15:08:12 +0000446
Anders Carlsson14c5cbf2009-08-16 07:36:22 +0000447 // Don't make this a live temporary if we're emitting an initializer expr.
448 if (!IsInitializer)
449 CGF.PushCXXTemporary(E->getTemporary(), Val);
Anders Carlssonb58d0172009-05-30 23:23:33 +0000450}
451
Anders Carlssonb14095a2009-04-17 00:06:03 +0000452void
Anders Carlsson31ccf372009-05-03 17:47:16 +0000453AggExprEmitter::VisitCXXConstructExpr(const CXXConstructExpr *E) {
Anders Carlssonb58d0172009-05-30 23:23:33 +0000454 llvm::Value *Val = DestPtr;
Mike Stump1eb44332009-09-09 15:08:12 +0000455
Anders Carlssonb58d0172009-05-30 23:23:33 +0000456 if (!Val) {
457 // Create a temporary variable.
458 Val = CGF.CreateTempAlloca(CGF.ConvertTypeForMem(E->getType()), "tmp");
459 }
Anders Carlsson8e587a12009-05-30 20:56:46 +0000460
Anders Carlssonb58d0172009-05-30 23:23:33 +0000461 CGF.EmitCXXConstructExpr(Val, E);
Anders Carlsson7f6ad152009-05-19 04:48:36 +0000462}
463
464void AggExprEmitter::VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E) {
Anders Carlsson14c5cbf2009-08-16 07:36:22 +0000465 CGF.EmitCXXExprWithTemporaries(E, DestPtr, VolatileDest, IsInitializer);
Anders Carlssonb14095a2009-04-17 00:06:03 +0000466}
467
Nuno Lopes329763b2009-10-18 15:18:11 +0000468void AggExprEmitter::VisitCXXZeroInitValueExpr(CXXZeroInitValueExpr *E) {
469 LValue lvalue = LValue::MakeAddr(DestPtr, Qualifiers());
470 EmitNullInitializationToLValue(lvalue, E->getType());
471}
472
Chris Lattnerf81557c2008-04-04 18:42:16 +0000473void AggExprEmitter::EmitInitializationToLValue(Expr* E, LValue LV) {
Mike Stump7f79f9b2009-05-29 15:46:01 +0000474 // FIXME: Ignore result?
Chris Lattnerf81557c2008-04-04 18:42:16 +0000475 // FIXME: Are initializers affected by volatile?
Douglas Gregor3498bdb2009-01-29 17:44:32 +0000476 if (isa<ImplicitValueInitExpr>(E)) {
Douglas Gregor4c678342009-01-28 21:54:33 +0000477 EmitNullInitializationToLValue(LV, E->getType());
Douglas Gregor3498bdb2009-01-29 17:44:32 +0000478 } else if (E->getType()->isComplexType()) {
479 CGF.EmitComplexExprIntoAddr(E, LV.getAddress(), false);
Eli Friedmanc8ba9612008-05-12 15:06:05 +0000480 } else if (CGF.hasAggregateLLVMType(E->getType())) {
481 CGF.EmitAnyExpr(E, LV.getAddress(), false);
482 } else {
483 CGF.EmitStoreThroughLValue(CGF.EmitAnyExpr(E), LV, E->getType());
Chris Lattnerf81557c2008-04-04 18:42:16 +0000484 }
Chris Lattnerf81557c2008-04-04 18:42:16 +0000485}
486
487void AggExprEmitter::EmitNullInitializationToLValue(LValue LV, QualType T) {
488 if (!CGF.hasAggregateLLVMType(T)) {
489 // For non-aggregates, we can store zero
Owen Andersonc9c88b42009-07-31 20:28:54 +0000490 llvm::Value *Null = llvm::Constant::getNullValue(CGF.ConvertType(T));
Daniel Dunbar82397132008-08-06 05:32:55 +0000491 CGF.EmitStoreThroughLValue(RValue::get(Null), LV, T);
Lauro Ramos Venancio145cd892008-02-19 19:27:31 +0000492 } else {
Chris Lattnerf81557c2008-04-04 18:42:16 +0000493 // Otherwise, just memset the whole thing to zero. This is legal
494 // because in LLVM, all default initializers are guaranteed to have a
495 // bit pattern of all zeros.
Eli Friedman0f593122009-04-13 21:47:26 +0000496 // FIXME: That isn't true for member pointers!
Chris Lattnerf81557c2008-04-04 18:42:16 +0000497 // There's a potential optimization opportunity in combining
498 // memsets; that would be easy for arrays, but relatively
499 // difficult for structures with the current code.
Eli Friedmanccf0ed82009-03-28 03:10:45 +0000500 CGF.EmitMemSetToZero(LV.getAddress(), T);
Chris Lattnerf81557c2008-04-04 18:42:16 +0000501 }
502}
503
Chris Lattnerf81557c2008-04-04 18:42:16 +0000504void AggExprEmitter::VisitInitListExpr(InitListExpr *E) {
Eli Friedmana385b3c2008-12-02 01:17:45 +0000505#if 0
Mike Stump1eb44332009-09-09 15:08:12 +0000506 // FIXME: Disabled while we figure out what to do about
Eli Friedmana385b3c2008-12-02 01:17:45 +0000507 // test/CodeGen/bitfield.c
508 //
Mike Stumpf5408fe2009-05-16 07:57:57 +0000509 // If we can, prefer a copy from a global; this is a lot less code for long
510 // globals, and it's easier for the current optimizers to analyze.
511 // FIXME: Should we really be doing this? Should we try to avoid cases where
512 // we emit a global with a lot of zeros? Should we try to avoid short
513 // globals?
Eli Friedmanc9e8f602009-01-25 02:32:41 +0000514 if (E->isConstantInitializer(CGF.getContext(), 0)) {
Eli Friedman994ffef2008-11-30 02:11:09 +0000515 llvm::Constant* C = CGF.CGM.EmitConstantExpr(E, &CGF);
516 llvm::GlobalVariable* GV =
517 new llvm::GlobalVariable(C->getType(), true,
518 llvm::GlobalValue::InternalLinkage,
519 C, "", &CGF.CGM.getModule(), 0);
Mike Stump4ac20dd2009-05-23 20:28:01 +0000520 EmitFinalDestCopy(E, LValue::MakeAddr(GV, 0));
Eli Friedman994ffef2008-11-30 02:11:09 +0000521 return;
522 }
Eli Friedmana385b3c2008-12-02 01:17:45 +0000523#endif
Douglas Gregora9c87802009-01-29 19:42:23 +0000524 if (E->hadArrayRangeDesignator()) {
525 CGF.ErrorUnsupported(E, "GNU array range designator extension");
526 }
527
Chris Lattnerf81557c2008-04-04 18:42:16 +0000528 // Handle initialization of an array.
529 if (E->getType()->isArrayType()) {
530 const llvm::PointerType *APType =
531 cast<llvm::PointerType>(DestPtr->getType());
532 const llvm::ArrayType *AType =
533 cast<llvm::ArrayType>(APType->getElementType());
Mike Stump1eb44332009-09-09 15:08:12 +0000534
Chris Lattnerf81557c2008-04-04 18:42:16 +0000535 uint64_t NumInitElements = E->getNumInits();
Eli Friedman922696f2008-05-19 17:51:16 +0000536
Chris Lattner96196622008-07-26 22:37:01 +0000537 if (E->getNumInits() > 0) {
538 QualType T1 = E->getType();
539 QualType T2 = E->getInit(0)->getType();
Eli Friedman2dce5f82009-05-28 23:04:00 +0000540 if (CGF.getContext().hasSameUnqualifiedType(T1, T2)) {
Chris Lattner96196622008-07-26 22:37:01 +0000541 EmitAggLoadOfLValue(E->getInit(0));
542 return;
543 }
Eli Friedman922696f2008-05-19 17:51:16 +0000544 }
545
Chris Lattnerf81557c2008-04-04 18:42:16 +0000546 uint64_t NumArrayElements = AType->getNumElements();
Chris Lattnerc63a1f22008-08-04 07:31:14 +0000547 QualType ElementType = CGF.getContext().getCanonicalType(E->getType());
Douglas Gregor4c678342009-01-28 21:54:33 +0000548 ElementType = CGF.getContext().getAsArrayType(ElementType)->getElementType();
Mike Stump1eb44332009-09-09 15:08:12 +0000549
John McCall0953e762009-09-24 19:53:00 +0000550 // FIXME: were we intentionally ignoring address spaces and GC attributes?
551 Qualifiers Quals = CGF.MakeQualifiers(ElementType);
Eli Friedman1e692ac2008-06-13 23:01:12 +0000552
Chris Lattnerf81557c2008-04-04 18:42:16 +0000553 for (uint64_t i = 0; i != NumArrayElements; ++i) {
554 llvm::Value *NextVal = Builder.CreateStructGEP(DestPtr, i, ".array");
555 if (i < NumInitElements)
Eli Friedman1e692ac2008-06-13 23:01:12 +0000556 EmitInitializationToLValue(E->getInit(i),
John McCall0953e762009-09-24 19:53:00 +0000557 LValue::MakeAddr(NextVal, Quals));
Chris Lattnerf81557c2008-04-04 18:42:16 +0000558 else
John McCall0953e762009-09-24 19:53:00 +0000559 EmitNullInitializationToLValue(LValue::MakeAddr(NextVal, Quals),
Chris Lattnerf81557c2008-04-04 18:42:16 +0000560 ElementType);
Lauro Ramos Venancio145cd892008-02-19 19:27:31 +0000561 }
Chris Lattnerf81557c2008-04-04 18:42:16 +0000562 return;
563 }
Mike Stump1eb44332009-09-09 15:08:12 +0000564
Chris Lattnerf81557c2008-04-04 18:42:16 +0000565 assert(E->getType()->isRecordType() && "Only support structs/unions here!");
Mike Stump1eb44332009-09-09 15:08:12 +0000566
Chris Lattnerf81557c2008-04-04 18:42:16 +0000567 // Do struct initialization; this code just sets each individual member
568 // to the approprate value. This makes bitfield support automatic;
569 // the disadvantage is that the generated code is more difficult for
570 // the optimizer, especially with bitfields.
571 unsigned NumInitElements = E->getNumInits();
Ted Kremenek6217b802009-07-29 21:53:49 +0000572 RecordDecl *SD = E->getType()->getAs<RecordType>()->getDecl();
Chris Lattnerf81557c2008-04-04 18:42:16 +0000573 unsigned CurInitVal = 0;
Douglas Gregor0bb76892009-01-29 16:53:55 +0000574
575 if (E->getType()->isUnionType()) {
576 // Only initialize one field of a union. The field itself is
577 // specified by the initializer list.
578 if (!E->getInitializedFieldInUnion()) {
579 // Empty union; we have nothing to do.
Mike Stump1eb44332009-09-09 15:08:12 +0000580
Douglas Gregor0bb76892009-01-29 16:53:55 +0000581#ifndef NDEBUG
582 // Make sure that it's really an empty and not a failure of
583 // semantic analysis.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +0000584 for (RecordDecl::field_iterator Field = SD->field_begin(),
585 FieldEnd = SD->field_end();
Douglas Gregor0bb76892009-01-29 16:53:55 +0000586 Field != FieldEnd; ++Field)
587 assert(Field->isUnnamedBitfield() && "Only unnamed bitfields allowed");
588#endif
589 return;
590 }
591
592 // FIXME: volatility
593 FieldDecl *Field = E->getInitializedFieldInUnion();
594 LValue FieldLoc = CGF.EmitLValueForField(DestPtr, Field, true, 0);
595
596 if (NumInitElements) {
597 // Store the initializer into the field
598 EmitInitializationToLValue(E->getInit(0), FieldLoc);
599 } else {
600 // Default-initialize to null
601 EmitNullInitializationToLValue(FieldLoc, Field->getType());
602 }
603
604 return;
605 }
Mike Stump1eb44332009-09-09 15:08:12 +0000606
Chris Lattnerf81557c2008-04-04 18:42:16 +0000607 // Here we iterate over the fields; this makes it simpler to both
608 // default-initialize fields and skip over unnamed fields.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +0000609 for (RecordDecl::field_iterator Field = SD->field_begin(),
610 FieldEnd = SD->field_end();
Douglas Gregor44b43212008-12-11 16:49:14 +0000611 Field != FieldEnd; ++Field) {
612 // We're done once we hit the flexible array member
613 if (Field->getType()->isIncompleteArrayType())
614 break;
615
Douglas Gregor34e79462009-01-28 23:36:17 +0000616 if (Field->isUnnamedBitfield())
Chris Lattnerf81557c2008-04-04 18:42:16 +0000617 continue;
Douglas Gregor34e79462009-01-28 23:36:17 +0000618
Eli Friedman1e692ac2008-06-13 23:01:12 +0000619 // FIXME: volatility
Douglas Gregor0bb76892009-01-29 16:53:55 +0000620 LValue FieldLoc = CGF.EmitLValueForField(DestPtr, *Field, false, 0);
Fariborz Jahanian14674ff2009-05-27 19:54:11 +0000621 // We never generate write-barries for initialized fields.
622 LValue::SetObjCNonGC(FieldLoc, true);
Chris Lattnerf81557c2008-04-04 18:42:16 +0000623 if (CurInitVal < NumInitElements) {
624 // Store the initializer into the field
Chris Lattnerf81557c2008-04-04 18:42:16 +0000625 EmitInitializationToLValue(E->getInit(CurInitVal++), FieldLoc);
626 } else {
627 // We're out of initalizers; default-initialize to null
Douglas Gregor44b43212008-12-11 16:49:14 +0000628 EmitNullInitializationToLValue(FieldLoc, Field->getType());
Chris Lattnerf81557c2008-04-04 18:42:16 +0000629 }
Lauro Ramos Venancio145cd892008-02-19 19:27:31 +0000630 }
Devang Patel636c3d02007-10-26 17:44:44 +0000631}
632
Chris Lattneree755f92007-08-21 04:59:27 +0000633//===----------------------------------------------------------------------===//
634// Entry Points into this File
635//===----------------------------------------------------------------------===//
636
Mike Stumpe1129a92009-05-26 18:57:45 +0000637/// EmitAggExpr - Emit the computation of the specified expression of aggregate
638/// type. The result is computed into DestPtr. Note that if DestPtr is null,
639/// the value of the aggregate expression is not needed. If VolatileDest is
640/// true, DestPtr cannot be 0.
Chris Lattneree755f92007-08-21 04:59:27 +0000641void CodeGenFunction::EmitAggExpr(const Expr *E, llvm::Value *DestPtr,
Anders Carlsson14c5cbf2009-08-16 07:36:22 +0000642 bool VolatileDest, bool IgnoreResult,
Mike Stump1eb44332009-09-09 15:08:12 +0000643 bool IsInitializer,
Fariborz Jahanian08c32132009-08-31 19:33:16 +0000644 bool RequiresGCollection) {
Chris Lattneree755f92007-08-21 04:59:27 +0000645 assert(E && hasAggregateLLVMType(E->getType()) &&
646 "Invalid aggregate expression to emit");
Mike Stumpe1129a92009-05-26 18:57:45 +0000647 assert ((DestPtr != 0 || VolatileDest == false)
648 && "volatile aggregate can't be 0");
Mike Stump1eb44332009-09-09 15:08:12 +0000649
Fariborz Jahanian08c32132009-08-31 19:33:16 +0000650 AggExprEmitter(*this, DestPtr, VolatileDest, IgnoreResult, IsInitializer,
651 RequiresGCollection)
Mike Stump49d1cd52009-05-26 22:03:21 +0000652 .Visit(const_cast<Expr*>(E));
Chris Lattneree755f92007-08-21 04:59:27 +0000653}
Daniel Dunbar7482d122008-09-09 20:49:46 +0000654
655void CodeGenFunction::EmitAggregateClear(llvm::Value *DestPtr, QualType Ty) {
656 assert(!Ty->isAnyComplexType() && "Shouldn't happen for complex");
657
658 EmitMemSetToZero(DestPtr, Ty);
659}
660
661void CodeGenFunction::EmitAggregateCopy(llvm::Value *DestPtr,
Mike Stump27fe2e62009-05-23 22:29:41 +0000662 llvm::Value *SrcPtr, QualType Ty,
663 bool isVolatile) {
Daniel Dunbar7482d122008-09-09 20:49:46 +0000664 assert(!Ty->isAnyComplexType() && "Shouldn't happen for complex");
Mike Stump1eb44332009-09-09 15:08:12 +0000665
Chris Lattner83c96292009-02-28 18:31:01 +0000666 // Aggregate assignment turns into llvm.memcpy. This is almost valid per
Chris Lattnerca4fc2c2009-02-28 18:18:58 +0000667 // C99 6.5.16.1p3, which states "If the value being stored in an object is
668 // read from another object that overlaps in anyway the storage of the first
669 // object, then the overlap shall be exact and the two objects shall have
670 // qualified or unqualified versions of a compatible type."
671 //
Chris Lattner83c96292009-02-28 18:31:01 +0000672 // memcpy is not defined if the source and destination pointers are exactly
Chris Lattnerca4fc2c2009-02-28 18:18:58 +0000673 // equal, but other compilers do this optimization, and almost every memcpy
674 // implementation handles this case safely. If there is a libc that does not
675 // safely handle this, we can add a target hook.
Benjamin Kramer3c0ef8c2009-10-13 10:07:13 +0000676 const llvm::Type *BP = llvm::Type::getInt8PtrTy(VMContext);
Daniel Dunbar7482d122008-09-09 20:49:46 +0000677 if (DestPtr->getType() != BP)
678 DestPtr = Builder.CreateBitCast(DestPtr, BP, "tmp");
679 if (SrcPtr->getType() != BP)
680 SrcPtr = Builder.CreateBitCast(SrcPtr, BP, "tmp");
Mike Stump1eb44332009-09-09 15:08:12 +0000681
Daniel Dunbar7482d122008-09-09 20:49:46 +0000682 // Get size and alignment info for this aggregate.
683 std::pair<uint64_t, unsigned> TypeInfo = getContext().getTypeInfo(Ty);
Mike Stump1eb44332009-09-09 15:08:12 +0000684
Daniel Dunbar7482d122008-09-09 20:49:46 +0000685 // FIXME: Handle variable sized types.
Owen Anderson0032b272009-08-13 21:57:51 +0000686 const llvm::Type *IntPtr =
687 llvm::IntegerType::get(VMContext, LLVMPointerWidth);
Mike Stump1eb44332009-09-09 15:08:12 +0000688
Mike Stumpfde64202009-05-23 04:13:59 +0000689 // FIXME: If we have a volatile struct, the optimizer can remove what might
690 // appear to be `extra' memory ops:
691 //
692 // volatile struct { int i; } a, b;
693 //
694 // int main() {
695 // a = b;
696 // a = b;
697 // }
698 //
Mike Stump49d1cd52009-05-26 22:03:21 +0000699 // we need to use a differnt call here. We use isVolatile to indicate when
700 // either the source or the destination is volatile.
Chris Lattnerca4fc2c2009-02-28 18:18:58 +0000701 Builder.CreateCall4(CGM.getMemCpyFn(),
Daniel Dunbar7482d122008-09-09 20:49:46 +0000702 DestPtr, SrcPtr,
703 // TypeInfo.first describes size in bits.
Owen Anderson4a28d5d2009-07-24 23:12:58 +0000704 llvm::ConstantInt::get(IntPtr, TypeInfo.first/8),
Mike Stump1eb44332009-09-09 15:08:12 +0000705 llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext),
Daniel Dunbar7482d122008-09-09 20:49:46 +0000706 TypeInfo.second/8));
707}