CGExprAgg.cpp revision 55e874299f2ad827646a4ca9ea38c402aaeb38c9
1e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng//===--- CGExprAgg.cpp - Emit LLVM Code from Aggregate Expressions --------===// 2e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng// 3e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng// The LLVM Compiler Infrastructure 4e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng// 5e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng// This file is distributed under the University of Illinois Open Source 6e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng// License. See LICENSE.TXT for details. 7e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng// 8e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng//===----------------------------------------------------------------------===// 9e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng// 10e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng// This contains code to emit Aggregate Expr nodes as LLVM code. 11e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng// 12e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng//===----------------------------------------------------------------------===// 13e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng 14e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng#include "CodeGenFunction.h" 15e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng#include "CodeGenModule.h" 16e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng#include "clang/AST/ASTContext.h" 17e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng#include "clang/AST/StmtVisitor.h" 18e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng#include "llvm/Constants.h" 19e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng#include "llvm/Function.h" 20e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng#include "llvm/GlobalVariable.h" 21e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng#include "llvm/Support/Compiler.h" 22e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng#include "llvm/Intrinsics.h" 23e6817ec1d8ab31fc7b01906e305f848542df6413Ben Chengusing namespace clang; 24e6817ec1d8ab31fc7b01906e305f848542df6413Ben Chengusing namespace CodeGen; 25e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng 26e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng//===----------------------------------------------------------------------===// 27e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng// Aggregate Expression Emitter 28e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng//===----------------------------------------------------------------------===// 29e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng 30e6817ec1d8ab31fc7b01906e305f848542df6413Ben Chengnamespace { 31e6817ec1d8ab31fc7b01906e305f848542df6413Ben Chengclass VISIBILITY_HIDDEN AggExprEmitter : public StmtVisitor<AggExprEmitter> { 32e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng CodeGenFunction &CGF; 33e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng CGBuilderTy &Builder; 34e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng llvm::Value *DestPtr; 35e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng bool VolatileDest; 36e6817ec1d8ab31fc7b01906e305f848542df6413Ben Chengpublic: 37e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng AggExprEmitter(CodeGenFunction &cgf, llvm::Value *destPtr, bool volatileDest) 38e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng : CGF(cgf), Builder(CGF.Builder), 39e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng DestPtr(destPtr), VolatileDest(volatileDest) { 40e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng } 41e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng 42e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng //===--------------------------------------------------------------------===// 43e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng // Utilities 44e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng //===--------------------------------------------------------------------===// 45e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng 46e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng /// EmitAggLoadOfLValue - Given an expression with aggregate type that 47e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng /// represents a value lvalue, this method emits the address of the lvalue, 48e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng /// then loads the result into DestPtr. 49e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng void EmitAggLoadOfLValue(const Expr *E); 50e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng 51e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng void EmitNonConstInit(InitListExpr *E); 52e6817ec1d8ab31fc7b01906e305f848542df6413Ben Cheng 53 //===--------------------------------------------------------------------===// 54 // Visitor Methods 55 //===--------------------------------------------------------------------===// 56 57 void VisitStmt(Stmt *S) { 58 CGF.ErrorUnsupported(S, "aggregate expression"); 59 } 60 void VisitParenExpr(ParenExpr *PE) { Visit(PE->getSubExpr()); } 61 62 // l-values. 63 void VisitDeclRefExpr(DeclRefExpr *DRE) { EmitAggLoadOfLValue(DRE); } 64 void VisitMemberExpr(MemberExpr *ME) { EmitAggLoadOfLValue(ME); } 65 void VisitUnaryDeref(UnaryOperator *E) { EmitAggLoadOfLValue(E); } 66 void VisitStringLiteral(StringLiteral *E) { EmitAggLoadOfLValue(E); } 67 void VisitCompoundLiteralExpr(CompoundLiteralExpr *E) 68 { EmitAggLoadOfLValue(E); } 69 70 void VisitArraySubscriptExpr(ArraySubscriptExpr *E) { 71 EmitAggLoadOfLValue(E); 72 } 73 74 // Operators. 75 // case Expr::UnaryOperatorClass: 76 // case Expr::CastExprClass: 77 void VisitImplicitCastExpr(ImplicitCastExpr *E); 78 void VisitCallExpr(const CallExpr *E); 79 void VisitStmtExpr(const StmtExpr *E); 80 void VisitBinaryOperator(const BinaryOperator *BO); 81 void VisitBinAssign(const BinaryOperator *E); 82 void VisitOverloadExpr(const OverloadExpr *E); 83 void VisitBinComma(const BinaryOperator *E); 84 85 void VisitObjCMessageExpr(ObjCMessageExpr *E); 86 void VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) { 87 EmitAggLoadOfLValue(E); 88 } 89 void VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E); 90 91 void VisitConditionalOperator(const ConditionalOperator *CO); 92 void VisitInitListExpr(InitListExpr *E); 93 void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) { 94 Visit(DAE->getExpr()); 95 } 96 void VisitVAArgExpr(VAArgExpr *E); 97 98 void EmitInitializationToLValue(Expr *E, LValue Address); 99 void EmitNullInitializationToLValue(LValue Address, QualType T); 100 // case Expr::ChooseExprClass: 101 102}; 103} // end anonymous namespace. 104 105//===----------------------------------------------------------------------===// 106// Utilities 107//===----------------------------------------------------------------------===// 108 109/// EmitAggLoadOfLValue - Given an expression with aggregate type that 110/// represents a value lvalue, this method emits the address of the lvalue, 111/// then loads the result into DestPtr. 112void AggExprEmitter::EmitAggLoadOfLValue(const Expr *E) { 113 LValue LV = CGF.EmitLValue(E); 114 assert(LV.isSimple() && "Can't have aggregate bitfield, vector, etc"); 115 llvm::Value *SrcPtr = LV.getAddress(); 116 117 // If the result is ignored, don't copy from the value. 118 if (DestPtr == 0) 119 // FIXME: If the source is volatile, we must read from it. 120 return; 121 122 CGF.EmitAggregateCopy(DestPtr, SrcPtr, E->getType()); 123} 124 125//===----------------------------------------------------------------------===// 126// Visitor Methods 127//===----------------------------------------------------------------------===// 128 129void AggExprEmitter::VisitImplicitCastExpr(ImplicitCastExpr *E) { 130 assert(CGF.getContext().typesAreCompatible( 131 E->getSubExpr()->getType().getUnqualifiedType(), 132 E->getType().getUnqualifiedType()) && 133 "Implicit cast types must be compatible"); 134 Visit(E->getSubExpr()); 135} 136 137void AggExprEmitter::VisitCallExpr(const CallExpr *E) { 138 RValue RV = CGF.EmitCallExpr(E); 139 assert(RV.isAggregate() && "Return value must be aggregate value!"); 140 141 // If the result is ignored, don't copy from the value. 142 if (DestPtr == 0) 143 // FIXME: If the source is volatile, we must read from it. 144 return; 145 146 CGF.EmitAggregateCopy(DestPtr, RV.getAggregateAddr(), E->getType()); 147} 148 149void AggExprEmitter::VisitObjCMessageExpr(ObjCMessageExpr *E) { 150 RValue RV = CGF.EmitObjCMessageExpr(E); 151 assert(RV.isAggregate() && "Return value must be aggregate value!"); 152 153 // If the result is ignored, don't copy from the value. 154 if (DestPtr == 0) 155 // FIXME: If the source is volatile, we must read from it. 156 return; 157 158 CGF.EmitAggregateCopy(DestPtr, RV.getAggregateAddr(), E->getType()); 159} 160 161void AggExprEmitter::VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E) { 162 RValue RV = CGF.EmitObjCPropertyGet(E); 163 assert(RV.isAggregate() && "Return value must be aggregate value!"); 164 165 // If the result is ignored, don't copy from the value. 166 if (DestPtr == 0) 167 // FIXME: If the source is volatile, we must read from it. 168 return; 169 170 CGF.EmitAggregateCopy(DestPtr, RV.getAggregateAddr(), E->getType()); 171} 172 173void AggExprEmitter::VisitOverloadExpr(const OverloadExpr *E) { 174 RValue RV = CGF.EmitCallExpr(E->getFn(), E->arg_begin(), 175 E->arg_end(CGF.getContext())); 176 177 assert(RV.isAggregate() && "Return value must be aggregate value!"); 178 179 // If the result is ignored, don't copy from the value. 180 if (DestPtr == 0) 181 // FIXME: If the source is volatile, we must read from it. 182 return; 183 184 CGF.EmitAggregateCopy(DestPtr, RV.getAggregateAddr(), E->getType()); 185} 186 187void AggExprEmitter::VisitBinComma(const BinaryOperator *E) { 188 CGF.EmitAnyExpr(E->getLHS()); 189 CGF.EmitAggExpr(E->getRHS(), DestPtr, false); 190} 191 192void AggExprEmitter::VisitStmtExpr(const StmtExpr *E) { 193 CGF.EmitCompoundStmt(*E->getSubStmt(), true, DestPtr, VolatileDest); 194} 195 196void AggExprEmitter::VisitBinaryOperator(const BinaryOperator *E) { 197 CGF.ErrorUnsupported(E, "aggregate binary expression"); 198} 199 200void AggExprEmitter::VisitBinAssign(const BinaryOperator *E) { 201 // For an assignment to work, the value on the right has 202 // to be compatible with the value on the left. 203 assert(CGF.getContext().typesAreCompatible( 204 E->getLHS()->getType().getUnqualifiedType(), 205 E->getRHS()->getType().getUnqualifiedType()) 206 && "Invalid assignment"); 207 LValue LHS = CGF.EmitLValue(E->getLHS()); 208 209 // We have to special case property setters, otherwise we must have 210 // a simple lvalue (no aggregates inside vectors, bitfields). 211 if (LHS.isPropertyRef()) { 212 // FIXME: Volatility? 213 llvm::Value *AggLoc = DestPtr; 214 if (!AggLoc) 215 AggLoc = CGF.CreateTempAlloca(CGF.ConvertType(E->getRHS()->getType())); 216 CGF.EmitAggExpr(E->getRHS(), AggLoc, false); 217 CGF.EmitObjCPropertySet(LHS.getPropertyRefExpr(), 218 RValue::getAggregate(AggLoc)); 219 } else { 220 // Codegen the RHS so that it stores directly into the LHS. 221 CGF.EmitAggExpr(E->getRHS(), LHS.getAddress(), false /*FIXME: VOLATILE LHS*/); 222 223 if (DestPtr == 0) 224 return; 225 226 // If the result of the assignment is used, copy the RHS there also. 227 CGF.EmitAggregateCopy(DestPtr, LHS.getAddress(), E->getType()); 228 } 229} 230 231void AggExprEmitter::VisitConditionalOperator(const ConditionalOperator *E) { 232 llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.?"); 233 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.:"); 234 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.cont"); 235 236 llvm::Value *Cond = CGF.EvaluateExprAsBool(E->getCond()); 237 Builder.CreateCondBr(Cond, LHSBlock, RHSBlock); 238 239 CGF.EmitBlock(LHSBlock); 240 241 // Handle the GNU extension for missing LHS. 242 assert(E->getLHS() && "Must have LHS for aggregate value"); 243 244 Visit(E->getLHS()); 245 Builder.CreateBr(ContBlock); 246 LHSBlock = Builder.GetInsertBlock(); 247 248 CGF.EmitBlock(RHSBlock); 249 250 Visit(E->getRHS()); 251 Builder.CreateBr(ContBlock); 252 RHSBlock = Builder.GetInsertBlock(); 253 254 CGF.EmitBlock(ContBlock); 255} 256 257void AggExprEmitter::VisitVAArgExpr(VAArgExpr *VE) { 258 llvm::Value *ArgValue = CGF.EmitLValue(VE->getSubExpr()).getAddress(); 259 llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, VE->getType()); 260 261 if (!ArgPtr) 262 CGF.ErrorUnsupported(VE, "aggregate va_arg expression"); 263 264 if (DestPtr) 265 // FIXME: volatility 266 CGF.EmitAggregateCopy(DestPtr, ArgPtr, VE->getType()); 267} 268 269void AggExprEmitter::EmitNonConstInit(InitListExpr *E) { 270 if (E->hadDesignators()) { 271 CGF.ErrorUnsupported(E, "initializer list with designators"); 272 return; 273 } 274 275 const llvm::PointerType *APType = 276 cast<llvm::PointerType>(DestPtr->getType()); 277 const llvm::Type *DestType = APType->getElementType(); 278 279 if (const llvm::ArrayType *AType = dyn_cast<llvm::ArrayType>(DestType)) { 280 unsigned NumInitElements = E->getNumInits(); 281 282 unsigned i; 283 for (i = 0; i != NumInitElements; ++i) { 284 llvm::Value *NextVal = Builder.CreateStructGEP(DestPtr, i, ".array"); 285 Expr *Init = E->getInit(i); 286 if (isa<InitListExpr>(Init)) 287 CGF.EmitAggExpr(Init, NextVal, VolatileDest); 288 else 289 // FIXME: volatility 290 Builder.CreateStore(CGF.EmitScalarExpr(Init), NextVal); 291 } 292 293 // Emit remaining default initializers 294 unsigned NumArrayElements = AType->getNumElements(); 295 QualType QType = E->getInit(0)->getType(); 296 const llvm::Type *EType = AType->getElementType(); 297 for (/*Do not initialize i*/; i < NumArrayElements; ++i) { 298 llvm::Value *NextVal = Builder.CreateStructGEP(DestPtr, i, ".array"); 299 if (EType->isSingleValueType()) 300 // FIXME: volatility 301 Builder.CreateStore(llvm::Constant::getNullValue(EType), NextVal); 302 else 303 CGF.EmitAggregateClear(NextVal, QType); 304 } 305 } else 306 assert(false && "Invalid initializer"); 307} 308 309void AggExprEmitter::EmitInitializationToLValue(Expr* E, LValue LV) { 310 // FIXME: Are initializers affected by volatile? 311 if (E->getType()->isComplexType()) { 312 CGF.EmitComplexExprIntoAddr(E, LV.getAddress(), false); 313 } else if (CGF.hasAggregateLLVMType(E->getType())) { 314 CGF.EmitAnyExpr(E, LV.getAddress(), false); 315 } else { 316 CGF.EmitStoreThroughLValue(CGF.EmitAnyExpr(E), LV, E->getType()); 317 } 318} 319 320void AggExprEmitter::EmitNullInitializationToLValue(LValue LV, QualType T) { 321 if (!CGF.hasAggregateLLVMType(T)) { 322 // For non-aggregates, we can store zero 323 llvm::Value *Null = llvm::Constant::getNullValue(CGF.ConvertType(T)); 324 CGF.EmitStoreThroughLValue(RValue::get(Null), LV, T); 325 } else { 326 // Otherwise, just memset the whole thing to zero. This is legal 327 // because in LLVM, all default initializers are guaranteed to have a 328 // bit pattern of all zeros. 329 // There's a potential optimization opportunity in combining 330 // memsets; that would be easy for arrays, but relatively 331 // difficult for structures with the current code. 332 llvm::Value *MemSet = CGF.CGM.getIntrinsic(llvm::Intrinsic::memset_i64); 333 uint64_t Size = CGF.getContext().getTypeSize(T); 334 335 const llvm::Type *BP = llvm::PointerType::getUnqual(llvm::Type::Int8Ty); 336 llvm::Value* DestPtr = Builder.CreateBitCast(LV.getAddress(), BP, "tmp"); 337 Builder.CreateCall4(MemSet, DestPtr, 338 llvm::ConstantInt::get(llvm::Type::Int8Ty, 0), 339 llvm::ConstantInt::get(llvm::Type::Int64Ty, Size/8), 340 llvm::ConstantInt::get(llvm::Type::Int32Ty, 0)); 341 } 342} 343 344void AggExprEmitter::VisitInitListExpr(InitListExpr *E) { 345 if (E->hadDesignators()) { 346 CGF.ErrorUnsupported(E, "initializer list with designators"); 347 return; 348 } 349 350 // FIXME: For constant expressions, call into const expr emitter so 351 // that we can emit a memcpy instead of storing the individual 352 // members. This is purely for perf; both codepaths lead to 353 // equivalent (although not necessarily identical) code. It's worth 354 // noting that LLVM keeps on getting smarter, though, so it might 355 // not be worth bothering. 356 357 // Handle initialization of an array. 358 if (E->getType()->isArrayType()) { 359 const llvm::PointerType *APType = 360 cast<llvm::PointerType>(DestPtr->getType()); 361 const llvm::ArrayType *AType = 362 cast<llvm::ArrayType>(APType->getElementType()); 363 364 uint64_t NumInitElements = E->getNumInits(); 365 366 if (E->getNumInits() > 0) { 367 QualType T1 = E->getType(); 368 QualType T2 = E->getInit(0)->getType(); 369 if (CGF.getContext().getCanonicalType(T1).getUnqualifiedType() == 370 CGF.getContext().getCanonicalType(T2).getUnqualifiedType()) { 371 EmitAggLoadOfLValue(E->getInit(0)); 372 return; 373 } 374 } 375 376 uint64_t NumArrayElements = AType->getNumElements(); 377 QualType ElementType = CGF.getContext().getCanonicalType(E->getType()); 378 ElementType =CGF.getContext().getAsArrayType(ElementType)->getElementType(); 379 380 unsigned CVRqualifier = ElementType.getCVRQualifiers(); 381 382 for (uint64_t i = 0; i != NumArrayElements; ++i) { 383 llvm::Value *NextVal = Builder.CreateStructGEP(DestPtr, i, ".array"); 384 if (i < NumInitElements) 385 EmitInitializationToLValue(E->getInit(i), 386 LValue::MakeAddr(NextVal, CVRqualifier)); 387 else 388 EmitNullInitializationToLValue(LValue::MakeAddr(NextVal, CVRqualifier), 389 ElementType); 390 } 391 return; 392 } 393 394 assert(E->getType()->isRecordType() && "Only support structs/unions here!"); 395 396 // Do struct initialization; this code just sets each individual member 397 // to the approprate value. This makes bitfield support automatic; 398 // the disadvantage is that the generated code is more difficult for 399 // the optimizer, especially with bitfields. 400 unsigned NumInitElements = E->getNumInits(); 401 RecordDecl *SD = E->getType()->getAsRecordType()->getDecl(); 402 unsigned NumMembers = SD->getNumMembers() - SD->hasFlexibleArrayMember(); 403 unsigned CurInitVal = 0; 404 bool isUnion = E->getType()->isUnionType(); 405 406 // Here we iterate over the fields; this makes it simpler to both 407 // default-initialize fields and skip over unnamed fields. 408 for (unsigned CurFieldNo = 0; CurFieldNo != NumMembers; ++CurFieldNo) { 409 FieldDecl *CurField = SD->getMember(CurFieldNo); 410 if (CurField->getIdentifier() == 0) { 411 // Initializers can't initialize unnamed fields, e.g. "int : 20;" 412 continue; 413 } 414 // FIXME: volatility 415 LValue FieldLoc = CGF.EmitLValueForField(DestPtr, CurField, isUnion,0); 416 if (CurInitVal < NumInitElements) { 417 // Store the initializer into the field 418 // This will probably have to get a bit smarter when we support 419 // designators in initializers 420 EmitInitializationToLValue(E->getInit(CurInitVal++), FieldLoc); 421 } else { 422 // We're out of initalizers; default-initialize to null 423 EmitNullInitializationToLValue(FieldLoc, CurField->getType()); 424 } 425 426 // Unions only initialize one field. 427 // (things can get weird with designators, but they aren't 428 // supported yet.) 429 if (E->getType()->isUnionType()) 430 break; 431 } 432} 433 434//===----------------------------------------------------------------------===// 435// Entry Points into this File 436//===----------------------------------------------------------------------===// 437 438/// EmitAggExpr - Emit the computation of the specified expression of 439/// aggregate type. The result is computed into DestPtr. Note that if 440/// DestPtr is null, the value of the aggregate expression is not needed. 441void CodeGenFunction::EmitAggExpr(const Expr *E, llvm::Value *DestPtr, 442 bool VolatileDest) { 443 assert(E && hasAggregateLLVMType(E->getType()) && 444 "Invalid aggregate expression to emit"); 445 446 AggExprEmitter(*this, DestPtr, VolatileDest).Visit(const_cast<Expr*>(E)); 447} 448 449void CodeGenFunction::EmitAggregateClear(llvm::Value *DestPtr, QualType Ty) { 450 assert(!Ty->isAnyComplexType() && "Shouldn't happen for complex"); 451 452 EmitMemSetToZero(DestPtr, Ty); 453} 454 455void CodeGenFunction::EmitAggregateCopy(llvm::Value *DestPtr, 456 llvm::Value *SrcPtr, QualType Ty) { 457 assert(!Ty->isAnyComplexType() && "Shouldn't happen for complex"); 458 459 // Aggregate assignment turns into llvm.memmove. 460 const llvm::Type *BP = llvm::PointerType::getUnqual(llvm::Type::Int8Ty); 461 if (DestPtr->getType() != BP) 462 DestPtr = Builder.CreateBitCast(DestPtr, BP, "tmp"); 463 if (SrcPtr->getType() != BP) 464 SrcPtr = Builder.CreateBitCast(SrcPtr, BP, "tmp"); 465 466 // Get size and alignment info for this aggregate. 467 std::pair<uint64_t, unsigned> TypeInfo = getContext().getTypeInfo(Ty); 468 469 // FIXME: Handle variable sized types. 470 const llvm::Type *IntPtr = llvm::IntegerType::get(LLVMPointerWidth); 471 472 Builder.CreateCall4(CGM.getMemMoveFn(), 473 DestPtr, SrcPtr, 474 // TypeInfo.first describes size in bits. 475 llvm::ConstantInt::get(IntPtr, TypeInfo.first/8), 476 llvm::ConstantInt::get(llvm::Type::Int32Ty, 477 TypeInfo.second/8)); 478} 479