1193326Sed//===--- CGExprAgg.cpp - Emit LLVM Code from Aggregate Expressions --------===// 2193326Sed// 3353358Sdim// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4353358Sdim// See https://llvm.org/LICENSE.txt for license information. 5353358Sdim// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6193326Sed// 7193326Sed//===----------------------------------------------------------------------===// 8193326Sed// 9193326Sed// This contains code to emit Aggregate Expr nodes as LLVM code. 10193326Sed// 11193326Sed//===----------------------------------------------------------------------===// 12193326Sed 13341825Sdim#include "CGCXXABI.h" 14249423Sdim#include "CGObjCRuntime.h" 15360784Sdim#include "CodeGenFunction.h" 16193326Sed#include "CodeGenModule.h" 17338697Sdim#include "ConstantEmitter.h" 18193326Sed#include "clang/AST/ASTContext.h" 19360784Sdim#include "clang/AST/Attr.h" 20193326Sed#include "clang/AST/DeclCXX.h" 21234353Sdim#include "clang/AST/DeclTemplate.h" 22193326Sed#include "clang/AST/StmtVisitor.h" 23249423Sdim#include "llvm/IR/Constants.h" 24249423Sdim#include "llvm/IR/Function.h" 25249423Sdim#include "llvm/IR/GlobalVariable.h" 26360784Sdim#include "llvm/IR/IntrinsicInst.h" 27249423Sdim#include "llvm/IR/Intrinsics.h" 28193326Sedusing namespace clang; 29193326Sedusing namespace CodeGen; 30193326Sed 31193326Sed//===----------------------------------------------------------------------===// 32193326Sed// Aggregate Expression Emitter 33193326Sed//===----------------------------------------------------------------------===// 34193326Sed 35193326Sednamespace { 36199990Srdivackyclass AggExprEmitter : public StmtVisitor<AggExprEmitter> { 37193326Sed CodeGenFunction &CGF; 38193326Sed CGBuilderTy &Builder; 39218893Sdim AggValueSlot Dest; 40288943Sdim bool IsResultUnused; 41208600Srdivacky 42218893Sdim AggValueSlot EnsureSlot(QualType T) { 43218893Sdim if (!Dest.isIgnored()) return Dest; 44218893Sdim return CGF.CreateAggTemp(T, "agg.tmp.ensured"); 45218893Sdim } 46239462Sdim void EnsureDest(QualType T) { 47239462Sdim if (!Dest.isIgnored()) return; 48239462Sdim Dest = CGF.CreateAggTemp(T, "agg.tmp.ensured"); 49239462Sdim } 50218893Sdim 51341825Sdim // Calls `Fn` with a valid return value slot, potentially creating a temporary 52341825Sdim // to do so. If a temporary is created, an appropriate copy into `Dest` will 53341825Sdim // be emitted, as will lifetime markers. 54341825Sdim // 55341825Sdim // The given function should take a ReturnValueSlot, and return an RValue that 56341825Sdim // points to said slot. 57341825Sdim void withReturnValueSlot(const Expr *E, 58341825Sdim llvm::function_ref<RValue(ReturnValueSlot)> Fn); 59341825Sdim 60193326Sedpublic: 61288943Sdim AggExprEmitter(CodeGenFunction &cgf, AggValueSlot Dest, bool IsResultUnused) 62288943Sdim : CGF(cgf), Builder(CGF.Builder), Dest(Dest), 63288943Sdim IsResultUnused(IsResultUnused) { } 64193326Sed 65193326Sed //===--------------------------------------------------------------------===// 66193326Sed // Utilities 67193326Sed //===--------------------------------------------------------------------===// 68193326Sed 69193326Sed /// EmitAggLoadOfLValue - Given an expression with aggregate type that 70193326Sed /// represents a value lvalue, this method emits the address of the lvalue, 71193326Sed /// then loads the result into DestPtr. 72193326Sed void EmitAggLoadOfLValue(const Expr *E); 73193326Sed 74341825Sdim enum ExprValueKind { 75341825Sdim EVK_RValue, 76341825Sdim EVK_NonRValue 77341825Sdim }; 78341825Sdim 79193326Sed /// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 80341825Sdim /// SrcIsRValue is true if source comes from an RValue. 81341825Sdim void EmitFinalDestCopy(QualType type, const LValue &src, 82341825Sdim ExprValueKind SrcValueKind = EVK_NonRValue); 83296417Sdim void EmitFinalDestCopy(QualType type, RValue src); 84239462Sdim void EmitCopy(QualType type, const AggValueSlot &dest, 85239462Sdim const AggValueSlot &src); 86193326Sed 87226633Sdim void EmitMoveFromReturnSlot(const Expr *E, RValue Src); 88208600Srdivacky 89296417Sdim void EmitArrayInit(Address DestPtr, llvm::ArrayType *AType, 90338697Sdim QualType ArrayQTy, InitListExpr *E); 91234353Sdim 92226633Sdim AggValueSlot::NeedsGCBarriers_t needsGC(QualType T) { 93234353Sdim if (CGF.getLangOpts().getGC() && TypeRequiresGCollection(T)) 94226633Sdim return AggValueSlot::NeedsGCBarriers; 95226633Sdim return AggValueSlot::DoesNotNeedGCBarriers; 96226633Sdim } 97226633Sdim 98208600Srdivacky bool TypeRequiresGCollection(QualType T); 99208600Srdivacky 100193326Sed //===--------------------------------------------------------------------===// 101193326Sed // Visitor Methods 102193326Sed //===--------------------------------------------------------------------===// 103198092Srdivacky 104288943Sdim void Visit(Expr *E) { 105288943Sdim ApplyDebugLocation DL(CGF, E); 106288943Sdim StmtVisitor<AggExprEmitter>::Visit(E); 107288943Sdim } 108288943Sdim 109193326Sed void VisitStmt(Stmt *S) { 110193326Sed CGF.ErrorUnsupported(S, "aggregate expression"); 111193326Sed } 112193326Sed void VisitParenExpr(ParenExpr *PE) { Visit(PE->getSubExpr()); } 113221345Sdim void VisitGenericSelectionExpr(GenericSelectionExpr *GE) { 114221345Sdim Visit(GE->getResultExpr()); 115221345Sdim } 116321369Sdim void VisitCoawaitExpr(CoawaitExpr *E) { 117321369Sdim CGF.EmitCoawaitExpr(*E, Dest, IsResultUnused); 118321369Sdim } 119321369Sdim void VisitCoyieldExpr(CoyieldExpr *E) { 120321369Sdim CGF.EmitCoyieldExpr(*E, Dest, IsResultUnused); 121321369Sdim } 122321369Sdim void VisitUnaryCoawait(UnaryOperator *E) { Visit(E->getSubExpr()); } 123193326Sed void VisitUnaryExtension(UnaryOperator *E) { Visit(E->getSubExpr()); } 124224145Sdim void VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *E) { 125224145Sdim return Visit(E->getReplacement()); 126224145Sdim } 127193326Sed 128344779Sdim void VisitConstantExpr(ConstantExpr *E) { 129344779Sdim return Visit(E->getSubExpr()); 130344779Sdim } 131344779Sdim 132193326Sed // l-values. 133327952Sdim void VisitDeclRefExpr(DeclRefExpr *E) { EmitAggLoadOfLValue(E); } 134193326Sed void VisitMemberExpr(MemberExpr *ME) { EmitAggLoadOfLValue(ME); } 135193326Sed void VisitUnaryDeref(UnaryOperator *E) { EmitAggLoadOfLValue(E); } 136193326Sed void VisitStringLiteral(StringLiteral *E) { EmitAggLoadOfLValue(E); } 137224145Sdim void VisitCompoundLiteralExpr(CompoundLiteralExpr *E); 138193326Sed void VisitArraySubscriptExpr(ArraySubscriptExpr *E) { 139193326Sed EmitAggLoadOfLValue(E); 140193326Sed } 141193326Sed void VisitPredefinedExpr(const PredefinedExpr *E) { 142198092Srdivacky EmitAggLoadOfLValue(E); 143193326Sed } 144198092Srdivacky 145193326Sed // Operators. 146198092Srdivacky void VisitCastExpr(CastExpr *E); 147193326Sed void VisitCallExpr(const CallExpr *E); 148193326Sed void VisitStmtExpr(const StmtExpr *E); 149193326Sed void VisitBinaryOperator(const BinaryOperator *BO); 150198398Srdivacky void VisitPointerToDataMemberBinaryOperator(const BinaryOperator *BO); 151193326Sed void VisitBinAssign(const BinaryOperator *E); 152193326Sed void VisitBinComma(const BinaryOperator *E); 153341825Sdim void VisitBinCmp(const BinaryOperator *E); 154360784Sdim void VisitCXXRewrittenBinaryOperator(CXXRewrittenBinaryOperator *E) { 155360784Sdim Visit(E->getSemanticForm()); 156360784Sdim } 157193326Sed 158193326Sed void VisitObjCMessageExpr(ObjCMessageExpr *E); 159193326Sed void VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) { 160193326Sed EmitAggLoadOfLValue(E); 161193326Sed } 162198092Srdivacky 163288943Sdim void VisitDesignatedInitUpdateExpr(DesignatedInitUpdateExpr *E); 164218893Sdim void VisitAbstractConditionalOperator(const AbstractConditionalOperator *CO); 165198092Srdivacky void VisitChooseExpr(const ChooseExpr *CE); 166193326Sed void VisitInitListExpr(InitListExpr *E); 167314564Sdim void VisitArrayInitLoopExpr(const ArrayInitLoopExpr *E, 168314564Sdim llvm::Value *outerBegin = nullptr); 169201361Srdivacky void VisitImplicitValueInitExpr(ImplicitValueInitExpr *E); 170288943Sdim void VisitNoInitExpr(NoInitExpr *E) { } // Do nothing. 171193326Sed void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) { 172353358Sdim CodeGenFunction::CXXDefaultArgExprScope Scope(CGF, DAE); 173193326Sed Visit(DAE->getExpr()); 174193326Sed } 175251662Sdim void VisitCXXDefaultInitExpr(CXXDefaultInitExpr *DIE) { 176353358Sdim CodeGenFunction::CXXDefaultInitExprScope Scope(CGF, DIE); 177251662Sdim Visit(DIE->getExpr()); 178251662Sdim } 179193326Sed void VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E); 180193326Sed void VisitCXXConstructExpr(const CXXConstructExpr *E); 181309124Sdim void VisitCXXInheritedCtorInitExpr(const CXXInheritedCtorInitExpr *E); 182234353Sdim void VisitLambdaExpr(LambdaExpr *E); 183261991Sdim void VisitCXXStdInitializerListExpr(CXXStdInitializerListExpr *E); 184218893Sdim void VisitExprWithCleanups(ExprWithCleanups *E); 185210299Sed void VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E); 186199482Srdivacky void VisitCXXTypeidExpr(CXXTypeidExpr *E) { EmitAggLoadOfLValue(E); } 187224145Sdim void VisitMaterializeTemporaryExpr(MaterializeTemporaryExpr *E); 188218893Sdim void VisitOpaqueValueExpr(OpaqueValueExpr *E); 189218893Sdim 190234353Sdim void VisitPseudoObjectExpr(PseudoObjectExpr *E) { 191234353Sdim if (E->isGLValue()) { 192234353Sdim LValue LV = CGF.EmitPseudoObjectLValue(E); 193239462Sdim return EmitFinalDestCopy(E->getType(), LV); 194234353Sdim } 195234353Sdim 196234353Sdim CGF.EmitPseudoObjectRValue(E, EnsureSlot(E->getType())); 197234353Sdim } 198234353Sdim 199193326Sed void VisitVAArgExpr(VAArgExpr *E); 200193326Sed 201224145Sdim void EmitInitializationToLValue(Expr *E, LValue Address); 202224145Sdim void EmitNullInitializationToLValue(LValue Address); 203193326Sed // case Expr::ChooseExprClass: 204200583Srdivacky void VisitCXXThrowExpr(const CXXThrowExpr *E) { CGF.EmitCXXThrowExpr(E); } 205226633Sdim void VisitAtomicExpr(AtomicExpr *E) { 206296417Sdim RValue Res = CGF.EmitAtomicExpr(E); 207296417Sdim EmitFinalDestCopy(E->getType(), Res); 208226633Sdim } 209193326Sed}; 210193326Sed} // end anonymous namespace. 211193326Sed 212193326Sed//===----------------------------------------------------------------------===// 213193326Sed// Utilities 214193326Sed//===----------------------------------------------------------------------===// 215193326Sed 216193326Sed/// EmitAggLoadOfLValue - Given an expression with aggregate type that 217193326Sed/// represents a value lvalue, this method emits the address of the lvalue, 218193326Sed/// then loads the result into DestPtr. 219193326Sedvoid AggExprEmitter::EmitAggLoadOfLValue(const Expr *E) { 220193326Sed LValue LV = CGF.EmitLValue(E); 221249423Sdim 222249423Sdim // If the type of the l-value is atomic, then do an atomic load. 223288943Sdim if (LV.getType()->isAtomicType() || CGF.LValueIsSuitableForInlineAtomic(LV)) { 224261991Sdim CGF.EmitAtomicLoad(LV, E->getExprLoc(), Dest); 225249423Sdim return; 226249423Sdim } 227249423Sdim 228239462Sdim EmitFinalDestCopy(E->getType(), LV); 229193326Sed} 230193326Sed 231341825Sdim/// True if the given aggregate type requires special GC API calls. 232208600Srdivackybool AggExprEmitter::TypeRequiresGCollection(QualType T) { 233208600Srdivacky // Only record types have members that might require garbage collection. 234208600Srdivacky const RecordType *RecordTy = T->getAs<RecordType>(); 235208600Srdivacky if (!RecordTy) return false; 236208600Srdivacky 237208600Srdivacky // Don't mess with non-trivial C++ types. 238208600Srdivacky RecordDecl *Record = RecordTy->getDecl(); 239208600Srdivacky if (isa<CXXRecordDecl>(Record) && 240249423Sdim (cast<CXXRecordDecl>(Record)->hasNonTrivialCopyConstructor() || 241208600Srdivacky !cast<CXXRecordDecl>(Record)->hasTrivialDestructor())) 242208600Srdivacky return false; 243208600Srdivacky 244208600Srdivacky // Check whether the type has an object member. 245208600Srdivacky return Record->hasObjectMember(); 246208600Srdivacky} 247208600Srdivacky 248341825Sdimvoid AggExprEmitter::withReturnValueSlot( 249341825Sdim const Expr *E, llvm::function_ref<RValue(ReturnValueSlot)> EmitCall) { 250341825Sdim QualType RetTy = E->getType(); 251341825Sdim bool RequiresDestruction = 252341825Sdim Dest.isIgnored() && 253341825Sdim RetTy.isDestructedType() == QualType::DK_nontrivial_c_struct; 254341825Sdim 255341825Sdim // If it makes no observable difference, save a memcpy + temporary. 256341825Sdim // 257341825Sdim // We need to always provide our own temporary if destruction is required. 258341825Sdim // Otherwise, EmitCall will emit its own, notice that it's "unused", and end 259341825Sdim // its lifetime before we have the chance to emit a proper destructor call. 260341825Sdim bool UseTemp = Dest.isPotentiallyAliased() || Dest.requiresGCollection() || 261341825Sdim (RequiresDestruction && !Dest.getAddress().isValid()); 262341825Sdim 263341825Sdim Address RetAddr = Address::invalid(); 264341825Sdim Address RetAllocaAddr = Address::invalid(); 265341825Sdim 266341825Sdim EHScopeStack::stable_iterator LifetimeEndBlock; 267341825Sdim llvm::Value *LifetimeSizePtr = nullptr; 268341825Sdim llvm::IntrinsicInst *LifetimeStartInst = nullptr; 269341825Sdim if (!UseTemp) { 270341825Sdim RetAddr = Dest.getAddress(); 271341825Sdim } else { 272341825Sdim RetAddr = CGF.CreateMemTemp(RetTy, "tmp", &RetAllocaAddr); 273341825Sdim uint64_t Size = 274341825Sdim CGF.CGM.getDataLayout().getTypeAllocSize(CGF.ConvertTypeForMem(RetTy)); 275341825Sdim LifetimeSizePtr = CGF.EmitLifetimeStart(Size, RetAllocaAddr.getPointer()); 276341825Sdim if (LifetimeSizePtr) { 277341825Sdim LifetimeStartInst = 278341825Sdim cast<llvm::IntrinsicInst>(std::prev(Builder.GetInsertPoint())); 279341825Sdim assert(LifetimeStartInst->getIntrinsicID() == 280341825Sdim llvm::Intrinsic::lifetime_start && 281341825Sdim "Last insertion wasn't a lifetime.start?"); 282341825Sdim 283341825Sdim CGF.pushFullExprCleanup<CodeGenFunction::CallLifetimeEnd>( 284341825Sdim NormalEHLifetimeMarker, RetAllocaAddr, LifetimeSizePtr); 285341825Sdim LifetimeEndBlock = CGF.EHStack.stable_begin(); 286341825Sdim } 287341825Sdim } 288341825Sdim 289341825Sdim RValue Src = 290341825Sdim EmitCall(ReturnValueSlot(RetAddr, Dest.isVolatile(), IsResultUnused)); 291341825Sdim 292341825Sdim if (RequiresDestruction) 293341825Sdim CGF.pushDestroy(RetTy.isDestructedType(), Src.getAggregateAddress(), RetTy); 294341825Sdim 295341825Sdim if (!UseTemp) 296226633Sdim return; 297341825Sdim 298341825Sdim assert(Dest.getPointer() != Src.getAggregatePointer()); 299341825Sdim EmitFinalDestCopy(E->getType(), Src); 300341825Sdim 301341825Sdim if (!RequiresDestruction && LifetimeStartInst) { 302341825Sdim // If there's no dtor to run, the copy was the last use of our temporary. 303341825Sdim // Since we're not guaranteed to be in an ExprWithCleanups, clean up 304341825Sdim // eagerly. 305341825Sdim CGF.DeactivateCleanupBlock(LifetimeEndBlock, LifetimeStartInst); 306341825Sdim CGF.EmitLifetimeEnd(LifetimeSizePtr, RetAllocaAddr.getPointer()); 307210299Sed } 308208600Srdivacky} 309208600Srdivacky 310193326Sed/// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 311296417Sdimvoid AggExprEmitter::EmitFinalDestCopy(QualType type, RValue src) { 312239462Sdim assert(src.isAggregate() && "value must be aggregate value!"); 313296417Sdim LValue srcLV = CGF.MakeAddrLValue(src.getAggregateAddress(), type); 314341825Sdim EmitFinalDestCopy(type, srcLV, EVK_RValue); 315239462Sdim} 316193326Sed 317239462Sdim/// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 318341825Sdimvoid AggExprEmitter::EmitFinalDestCopy(QualType type, const LValue &src, 319341825Sdim ExprValueKind SrcValueKind) { 320218893Sdim // If Dest is ignored, then we're evaluating an aggregate expression 321239462Sdim // in a context that doesn't care about the result. Note that loads 322239462Sdim // from volatile l-values force the existence of a non-ignored 323239462Sdim // destination. 324239462Sdim if (Dest.isIgnored()) 325239462Sdim return; 326212904Sdim 327341825Sdim // Copy non-trivial C structs here. 328341825Sdim LValue DstLV = CGF.MakeAddrLValue( 329341825Sdim Dest.getAddress(), Dest.isVolatile() ? type.withVolatile() : type); 330341825Sdim 331341825Sdim if (SrcValueKind == EVK_RValue) { 332341825Sdim if (type.isNonTrivialToPrimitiveDestructiveMove() == QualType::PCK_Struct) { 333341825Sdim if (Dest.isPotentiallyAliased()) 334341825Sdim CGF.callCStructMoveAssignmentOperator(DstLV, src); 335341825Sdim else 336341825Sdim CGF.callCStructMoveConstructor(DstLV, src); 337341825Sdim return; 338341825Sdim } 339341825Sdim } else { 340341825Sdim if (type.isNonTrivialToPrimitiveCopy() == QualType::PCK_Struct) { 341341825Sdim if (Dest.isPotentiallyAliased()) 342341825Sdim CGF.callCStructCopyAssignmentOperator(DstLV, src); 343341825Sdim else 344341825Sdim CGF.callCStructCopyConstructor(DstLV, src); 345341825Sdim return; 346341825Sdim } 347341825Sdim } 348341825Sdim 349360784Sdim AggValueSlot srcAgg = AggValueSlot::forLValue( 350360784Sdim src, CGF, AggValueSlot::IsDestructed, needsGC(type), 351360784Sdim AggValueSlot::IsAliased, AggValueSlot::MayOverlap); 352239462Sdim EmitCopy(type, Dest, srcAgg); 353239462Sdim} 354193326Sed 355239462Sdim/// Perform a copy from the source into the destination. 356239462Sdim/// 357239462Sdim/// \param type - the type of the aggregate being copied; qualifiers are 358239462Sdim/// ignored 359239462Sdimvoid AggExprEmitter::EmitCopy(QualType type, const AggValueSlot &dest, 360239462Sdim const AggValueSlot &src) { 361239462Sdim if (dest.requiresGCollection()) { 362341825Sdim CharUnits sz = dest.getPreferredSize(CGF.getContext(), type); 363239462Sdim llvm::Value *size = llvm::ConstantInt::get(CGF.SizeTy, sz.getQuantity()); 364198092Srdivacky CGF.CGM.getObjCRuntime().EmitGCMemmoveCollectable(CGF, 365296417Sdim dest.getAddress(), 366296417Sdim src.getAddress(), 367239462Sdim size); 368198092Srdivacky return; 369198092Srdivacky } 370239462Sdim 371193326Sed // If the result of the assignment is used, copy the LHS there also. 372239462Sdim // It's volatile if either side is. Use the minimum alignment of 373239462Sdim // the two sides. 374341825Sdim LValue DestLV = CGF.MakeAddrLValue(dest.getAddress(), type); 375341825Sdim LValue SrcLV = CGF.MakeAddrLValue(src.getAddress(), type); 376341825Sdim CGF.EmitAggregateCopy(DestLV, SrcLV, type, dest.mayOverlap(), 377296417Sdim dest.isVolatile() || src.isVolatile()); 378193326Sed} 379193326Sed 380341825Sdim/// Emit the initializer for a std::initializer_list initialized with a 381234353Sdim/// real initializer list. 382261991Sdimvoid 383261991SdimAggExprEmitter::VisitCXXStdInitializerListExpr(CXXStdInitializerListExpr *E) { 384261991Sdim // Emit an array containing the elements. The array is externally destructed 385261991Sdim // if the std::initializer_list object is. 386261991Sdim ASTContext &Ctx = CGF.getContext(); 387261991Sdim LValue Array = CGF.EmitLValue(E->getSubExpr()); 388261991Sdim assert(Array.isSimple() && "initializer_list array not a simple lvalue"); 389360784Sdim Address ArrayPtr = Array.getAddress(CGF); 390234353Sdim 391261991Sdim const ConstantArrayType *ArrayType = 392261991Sdim Ctx.getAsConstantArrayType(E->getSubExpr()->getType()); 393261991Sdim assert(ArrayType && "std::initializer_list constructed from non-array"); 394234353Sdim 395261991Sdim // FIXME: Perform the checks on the field types in SemaInit. 396261991Sdim RecordDecl *Record = E->getType()->castAs<RecordType>()->getDecl(); 397261991Sdim RecordDecl::field_iterator Field = Record->field_begin(); 398261991Sdim if (Field == Record->field_end()) { 399261991Sdim CGF.ErrorUnsupported(E, "weird std::initializer_list"); 400234353Sdim return; 401234353Sdim } 402234353Sdim 403234353Sdim // Start pointer. 404261991Sdim if (!Field->getType()->isPointerType() || 405261991Sdim !Ctx.hasSameType(Field->getType()->getPointeeType(), 406261991Sdim ArrayType->getElementType())) { 407261991Sdim CGF.ErrorUnsupported(E, "weird std::initializer_list"); 408234353Sdim return; 409234353Sdim } 410234353Sdim 411261991Sdim AggValueSlot Dest = EnsureSlot(E->getType()); 412296417Sdim LValue DestLV = CGF.MakeAddrLValue(Dest.getAddress(), E->getType()); 413261991Sdim LValue Start = CGF.EmitLValueForFieldInitialization(DestLV, *Field); 414261991Sdim llvm::Value *Zero = llvm::ConstantInt::get(CGF.PtrDiffTy, 0); 415261991Sdim llvm::Value *IdxStart[] = { Zero, Zero }; 416261991Sdim llvm::Value *ArrayStart = 417296417Sdim Builder.CreateInBoundsGEP(ArrayPtr.getPointer(), IdxStart, "arraystart"); 418261991Sdim CGF.EmitStoreThroughLValue(RValue::get(ArrayStart), Start); 419261991Sdim ++Field; 420261991Sdim 421261991Sdim if (Field == Record->field_end()) { 422261991Sdim CGF.ErrorUnsupported(E, "weird std::initializer_list"); 423234353Sdim return; 424234353Sdim } 425261991Sdim 426261991Sdim llvm::Value *Size = Builder.getInt(ArrayType->getSize()); 427261991Sdim LValue EndOrLength = CGF.EmitLValueForFieldInitialization(DestLV, *Field); 428261991Sdim if (Field->getType()->isPointerType() && 429261991Sdim Ctx.hasSameType(Field->getType()->getPointeeType(), 430261991Sdim ArrayType->getElementType())) { 431234353Sdim // End pointer. 432261991Sdim llvm::Value *IdxEnd[] = { Zero, Size }; 433261991Sdim llvm::Value *ArrayEnd = 434296417Sdim Builder.CreateInBoundsGEP(ArrayPtr.getPointer(), IdxEnd, "arrayend"); 435261991Sdim CGF.EmitStoreThroughLValue(RValue::get(ArrayEnd), EndOrLength); 436261991Sdim } else if (Ctx.hasSameType(Field->getType(), Ctx.getSizeType())) { 437234353Sdim // Length. 438261991Sdim CGF.EmitStoreThroughLValue(RValue::get(Size), EndOrLength); 439234353Sdim } else { 440261991Sdim CGF.ErrorUnsupported(E, "weird std::initializer_list"); 441234353Sdim return; 442234353Sdim } 443234353Sdim} 444234353Sdim 445341825Sdim/// Determine if E is a trivial array filler, that is, one that is 446276479Sdim/// equivalent to zero-initialization. 447276479Sdimstatic bool isTrivialFiller(Expr *E) { 448276479Sdim if (!E) 449276479Sdim return true; 450276479Sdim 451276479Sdim if (isa<ImplicitValueInitExpr>(E)) 452276479Sdim return true; 453276479Sdim 454276479Sdim if (auto *ILE = dyn_cast<InitListExpr>(E)) { 455276479Sdim if (ILE->getNumInits()) 456276479Sdim return false; 457276479Sdim return isTrivialFiller(ILE->getArrayFiller()); 458276479Sdim } 459276479Sdim 460276479Sdim if (auto *Cons = dyn_cast_or_null<CXXConstructExpr>(E)) 461276479Sdim return Cons->getConstructor()->isDefaultConstructor() && 462276479Sdim Cons->getConstructor()->isTrivial(); 463276479Sdim 464276479Sdim // FIXME: Are there other cases where we can avoid emitting an initializer? 465276479Sdim return false; 466276479Sdim} 467276479Sdim 468341825Sdim/// Emit initialization of an array from an initializer list. 469296417Sdimvoid AggExprEmitter::EmitArrayInit(Address DestPtr, llvm::ArrayType *AType, 470338697Sdim QualType ArrayQTy, InitListExpr *E) { 471234353Sdim uint64_t NumInitElements = E->getNumInits(); 472234353Sdim 473234353Sdim uint64_t NumArrayElements = AType->getNumElements(); 474234353Sdim assert(NumInitElements <= NumArrayElements); 475234353Sdim 476338697Sdim QualType elementType = 477338697Sdim CGF.getContext().getAsArrayType(ArrayQTy)->getElementType(); 478338697Sdim 479234353Sdim // DestPtr is an array*. Construct an elementType* by drilling 480234353Sdim // down a level. 481234353Sdim llvm::Value *zero = llvm::ConstantInt::get(CGF.SizeTy, 0); 482234353Sdim llvm::Value *indices[] = { zero, zero }; 483234353Sdim llvm::Value *begin = 484296417Sdim Builder.CreateInBoundsGEP(DestPtr.getPointer(), indices, "arrayinit.begin"); 485234353Sdim 486296417Sdim CharUnits elementSize = CGF.getContext().getTypeSizeInChars(elementType); 487296417Sdim CharUnits elementAlign = 488296417Sdim DestPtr.getAlignment().alignmentOfArrayElement(elementSize); 489296417Sdim 490338697Sdim // Consider initializing the array by copying from a global. For this to be 491338697Sdim // more efficient than per-element initialization, the size of the elements 492338697Sdim // with explicit initializers should be large enough. 493338697Sdim if (NumInitElements * elementSize.getQuantity() > 16 && 494338697Sdim elementType.isTriviallyCopyableType(CGF.getContext())) { 495338697Sdim CodeGen::CodeGenModule &CGM = CGF.CGM; 496360784Sdim ConstantEmitter Emitter(CGF); 497338697Sdim LangAS AS = ArrayQTy.getAddressSpace(); 498338697Sdim if (llvm::Constant *C = Emitter.tryEmitForInitializer(E, AS, ArrayQTy)) { 499338697Sdim auto GV = new llvm::GlobalVariable( 500338697Sdim CGM.getModule(), C->getType(), 501338697Sdim CGM.isTypeConstant(ArrayQTy, /* ExcludeCtorDtor= */ true), 502338697Sdim llvm::GlobalValue::PrivateLinkage, C, "constinit", 503338697Sdim /* InsertBefore= */ nullptr, llvm::GlobalVariable::NotThreadLocal, 504338697Sdim CGM.getContext().getTargetAddressSpace(AS)); 505338697Sdim Emitter.finalize(GV); 506338697Sdim CharUnits Align = CGM.getContext().getTypeAlignInChars(ArrayQTy); 507360784Sdim GV->setAlignment(Align.getAsAlign()); 508338697Sdim EmitFinalDestCopy(ArrayQTy, CGF.MakeAddrLValue(GV, ArrayQTy, Align)); 509338697Sdim return; 510338697Sdim } 511338697Sdim } 512338697Sdim 513234353Sdim // Exception safety requires us to destroy all the 514234353Sdim // already-constructed members if an initializer throws. 515234353Sdim // For that, we'll need an EH cleanup. 516234353Sdim QualType::DestructionKind dtorKind = elementType.isDestructedType(); 517296417Sdim Address endOfInit = Address::invalid(); 518234353Sdim EHScopeStack::stable_iterator cleanup; 519276479Sdim llvm::Instruction *cleanupDominator = nullptr; 520234353Sdim if (CGF.needsEHCleanup(dtorKind)) { 521234353Sdim // In principle we could tell the cleanup where we are more 522234353Sdim // directly, but the control flow can get so varied here that it 523234353Sdim // would actually be quite complex. Therefore we go through an 524234353Sdim // alloca. 525296417Sdim endOfInit = CGF.CreateTempAlloca(begin->getType(), CGF.getPointerAlign(), 526234353Sdim "arrayinit.endOfInit"); 527234353Sdim cleanupDominator = Builder.CreateStore(begin, endOfInit); 528234353Sdim CGF.pushIrregularPartialArrayCleanup(begin, endOfInit, elementType, 529296417Sdim elementAlign, 530234353Sdim CGF.getDestroyer(dtorKind)); 531234353Sdim cleanup = CGF.EHStack.stable_begin(); 532234353Sdim 533234353Sdim // Otherwise, remember that we didn't need a cleanup. 534234353Sdim } else { 535234353Sdim dtorKind = QualType::DK_none; 536234353Sdim } 537234353Sdim 538234353Sdim llvm::Value *one = llvm::ConstantInt::get(CGF.SizeTy, 1); 539234353Sdim 540234353Sdim // The 'current element to initialize'. The invariants on this 541234353Sdim // variable are complicated. Essentially, after each iteration of 542234353Sdim // the loop, it points to the last initialized element, except 543234353Sdim // that it points to the beginning of the array before any 544234353Sdim // elements have been initialized. 545234353Sdim llvm::Value *element = begin; 546234353Sdim 547234353Sdim // Emit the explicit initializers. 548234353Sdim for (uint64_t i = 0; i != NumInitElements; ++i) { 549234353Sdim // Advance to the next element. 550234353Sdim if (i > 0) { 551234353Sdim element = Builder.CreateInBoundsGEP(element, one, "arrayinit.element"); 552234353Sdim 553234353Sdim // Tell the cleanup that it needs to destroy up to this 554234353Sdim // element. TODO: some of these stores can be trivially 555234353Sdim // observed to be unnecessary. 556296417Sdim if (endOfInit.isValid()) Builder.CreateStore(element, endOfInit); 557234353Sdim } 558234353Sdim 559296417Sdim LValue elementLV = 560296417Sdim CGF.MakeAddrLValue(Address(element, elementAlign), elementType); 561261991Sdim EmitInitializationToLValue(E->getInit(i), elementLV); 562234353Sdim } 563234353Sdim 564234353Sdim // Check whether there's a non-trivial array-fill expression. 565234353Sdim Expr *filler = E->getArrayFiller(); 566276479Sdim bool hasTrivialFiller = isTrivialFiller(filler); 567234353Sdim 568234353Sdim // Any remaining elements need to be zero-initialized, possibly 569234353Sdim // using the filler expression. We can skip this if the we're 570234353Sdim // emitting to zeroed memory. 571234353Sdim if (NumInitElements != NumArrayElements && 572234353Sdim !(Dest.isZeroed() && hasTrivialFiller && 573234353Sdim CGF.getTypes().isZeroInitializable(elementType))) { 574234353Sdim 575234353Sdim // Use an actual loop. This is basically 576234353Sdim // do { *array++ = filler; } while (array != end); 577234353Sdim 578234353Sdim // Advance to the start of the rest of the array. 579234353Sdim if (NumInitElements) { 580234353Sdim element = Builder.CreateInBoundsGEP(element, one, "arrayinit.start"); 581296417Sdim if (endOfInit.isValid()) Builder.CreateStore(element, endOfInit); 582234353Sdim } 583234353Sdim 584234353Sdim // Compute the end of the array. 585234353Sdim llvm::Value *end = Builder.CreateInBoundsGEP(begin, 586234353Sdim llvm::ConstantInt::get(CGF.SizeTy, NumArrayElements), 587234353Sdim "arrayinit.end"); 588234353Sdim 589234353Sdim llvm::BasicBlock *entryBB = Builder.GetInsertBlock(); 590234353Sdim llvm::BasicBlock *bodyBB = CGF.createBasicBlock("arrayinit.body"); 591234353Sdim 592234353Sdim // Jump into the body. 593234353Sdim CGF.EmitBlock(bodyBB); 594234353Sdim llvm::PHINode *currentElement = 595234353Sdim Builder.CreatePHI(element->getType(), 2, "arrayinit.cur"); 596234353Sdim currentElement->addIncoming(element, entryBB); 597234353Sdim 598234353Sdim // Emit the actual filler expression. 599321369Sdim { 600321369Sdim // C++1z [class.temporary]p5: 601321369Sdim // when a default constructor is called to initialize an element of 602321369Sdim // an array with no corresponding initializer [...] the destruction of 603321369Sdim // every temporary created in a default argument is sequenced before 604321369Sdim // the construction of the next array element, if any 605321369Sdim CodeGenFunction::RunCleanupsScope CleanupsScope(CGF); 606321369Sdim LValue elementLV = 607321369Sdim CGF.MakeAddrLValue(Address(currentElement, elementAlign), elementType); 608321369Sdim if (filler) 609321369Sdim EmitInitializationToLValue(filler, elementLV); 610321369Sdim else 611321369Sdim EmitNullInitializationToLValue(elementLV); 612321369Sdim } 613234353Sdim 614234353Sdim // Move on to the next element. 615234353Sdim llvm::Value *nextElement = 616234353Sdim Builder.CreateInBoundsGEP(currentElement, one, "arrayinit.next"); 617234353Sdim 618234353Sdim // Tell the EH cleanup that we finished with the last element. 619296417Sdim if (endOfInit.isValid()) Builder.CreateStore(nextElement, endOfInit); 620234353Sdim 621234353Sdim // Leave the loop if we're done. 622234353Sdim llvm::Value *done = Builder.CreateICmpEQ(nextElement, end, 623234353Sdim "arrayinit.done"); 624234353Sdim llvm::BasicBlock *endBB = CGF.createBasicBlock("arrayinit.end"); 625234353Sdim Builder.CreateCondBr(done, endBB, bodyBB); 626234353Sdim currentElement->addIncoming(nextElement, Builder.GetInsertBlock()); 627234353Sdim 628234353Sdim CGF.EmitBlock(endBB); 629234353Sdim } 630234353Sdim 631234353Sdim // Leave the partial-array cleanup if we entered one. 632234353Sdim if (dtorKind) CGF.DeactivateCleanupBlock(cleanup, cleanupDominator); 633234353Sdim} 634234353Sdim 635193326Sed//===----------------------------------------------------------------------===// 636193326Sed// Visitor Methods 637193326Sed//===----------------------------------------------------------------------===// 638193326Sed 639224145Sdimvoid AggExprEmitter::VisitMaterializeTemporaryExpr(MaterializeTemporaryExpr *E){ 640360784Sdim Visit(E->getSubExpr()); 641224145Sdim} 642224145Sdim 643218893Sdimvoid AggExprEmitter::VisitOpaqueValueExpr(OpaqueValueExpr *e) { 644341825Sdim // If this is a unique OVE, just visit its source expression. 645341825Sdim if (e->isUnique()) 646341825Sdim Visit(e->getSourceExpr()); 647341825Sdim else 648341825Sdim EmitFinalDestCopy(e->getType(), CGF.getOrCreateOpaqueLValueMapping(e)); 649218893Sdim} 650218893Sdim 651224145Sdimvoid 652224145SdimAggExprEmitter::VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { 653249423Sdim if (Dest.isPotentiallyAliased() && 654249423Sdim E->getType().isPODType(CGF.getContext())) { 655224145Sdim // For a POD type, just emit a load of the lvalue + a copy, because our 656224145Sdim // compound literal might alias the destination. 657224145Sdim EmitAggLoadOfLValue(E); 658224145Sdim return; 659224145Sdim } 660341825Sdim 661224145Sdim AggValueSlot Slot = EnsureSlot(E->getType()); 662224145Sdim CGF.EmitAggExpr(E->getInitializer(), Slot); 663224145Sdim} 664224145Sdim 665249423Sdim/// Attempt to look through various unimportant expressions to find a 666249423Sdim/// cast of the given kind. 667249423Sdimstatic Expr *findPeephole(Expr *op, CastKind kind) { 668249423Sdim while (true) { 669249423Sdim op = op->IgnoreParens(); 670249423Sdim if (CastExpr *castE = dyn_cast<CastExpr>(op)) { 671249423Sdim if (castE->getCastKind() == kind) 672249423Sdim return castE->getSubExpr(); 673249423Sdim if (castE->getCastKind() == CK_NoOp) 674249423Sdim continue; 675249423Sdim } 676276479Sdim return nullptr; 677249423Sdim } 678249423Sdim} 679224145Sdim 680198092Srdivackyvoid AggExprEmitter::VisitCastExpr(CastExpr *E) { 681296417Sdim if (const auto *ECE = dyn_cast<ExplicitCastExpr>(E)) 682296417Sdim CGF.CGM.EmitExplicitCastExprType(ECE, &CGF); 683198092Srdivacky switch (E->getCastKind()) { 684212904Sdim case CK_Dynamic: { 685243830Sdim // FIXME: Can this actually happen? We have no test coverage for it. 686208600Srdivacky assert(isa<CXXDynamicCastExpr>(E) && "CK_Dynamic without a dynamic_cast?"); 687243830Sdim LValue LV = CGF.EmitCheckedLValue(E->getSubExpr(), 688243830Sdim CodeGenFunction::TCK_Load); 689208600Srdivacky // FIXME: Do we also need to handle property references here? 690208600Srdivacky if (LV.isSimple()) 691360784Sdim CGF.EmitDynamicCast(LV.getAddress(CGF), cast<CXXDynamicCastExpr>(E)); 692208600Srdivacky else 693208600Srdivacky CGF.CGM.ErrorUnsupported(E, "non-simple lvalue dynamic_cast"); 694341825Sdim 695218893Sdim if (!Dest.isIgnored()) 696218893Sdim CGF.CGM.ErrorUnsupported(E, "lvalue dynamic_cast with a destination"); 697208600Srdivacky break; 698208600Srdivacky } 699341825Sdim 700212904Sdim case CK_ToUnion: { 701288943Sdim // Evaluate even if the destination is ignored. 702288943Sdim if (Dest.isIgnored()) { 703288943Sdim CGF.EmitAnyExpr(E->getSubExpr(), AggValueSlot::ignored(), 704288943Sdim /*ignoreResult=*/true); 705288943Sdim break; 706288943Sdim } 707221345Sdim 708198092Srdivacky // GCC union extension 709212904Sdim QualType Ty = E->getSubExpr()->getType(); 710296417Sdim Address CastPtr = 711296417Sdim Builder.CreateElementBitCast(Dest.getAddress(), CGF.ConvertType(Ty)); 712224145Sdim EmitInitializationToLValue(E->getSubExpr(), 713224145Sdim CGF.MakeAddrLValue(CastPtr, Ty)); 714198092Srdivacky break; 715193326Sed } 716193326Sed 717353358Sdim case CK_LValueToRValueBitCast: { 718353358Sdim if (Dest.isIgnored()) { 719353358Sdim CGF.EmitAnyExpr(E->getSubExpr(), AggValueSlot::ignored(), 720353358Sdim /*ignoreResult=*/true); 721353358Sdim break; 722353358Sdim } 723353358Sdim 724353358Sdim LValue SourceLV = CGF.EmitLValue(E->getSubExpr()); 725353358Sdim Address SourceAddress = 726360784Sdim Builder.CreateElementBitCast(SourceLV.getAddress(CGF), CGF.Int8Ty); 727353358Sdim Address DestAddress = 728353358Sdim Builder.CreateElementBitCast(Dest.getAddress(), CGF.Int8Ty); 729353358Sdim llvm::Value *SizeVal = llvm::ConstantInt::get( 730353358Sdim CGF.SizeTy, 731353358Sdim CGF.getContext().getTypeSizeInChars(E->getType()).getQuantity()); 732353358Sdim Builder.CreateMemCpy(DestAddress, SourceAddress, SizeVal); 733353358Sdim break; 734353358Sdim } 735353358Sdim 736212904Sdim case CK_DerivedToBase: 737212904Sdim case CK_BaseToDerived: 738212904Sdim case CK_UncheckedDerivedToBase: { 739226633Sdim llvm_unreachable("cannot perform hierarchy conversion in EmitAggExpr: " 740208600Srdivacky "should have been unpacked before we got here"); 741208600Srdivacky } 742208600Srdivacky 743249423Sdim case CK_NonAtomicToAtomic: 744249423Sdim case CK_AtomicToNonAtomic: { 745249423Sdim bool isToAtomic = (E->getCastKind() == CK_NonAtomicToAtomic); 746249423Sdim 747249423Sdim // Determine the atomic and value types. 748249423Sdim QualType atomicType = E->getSubExpr()->getType(); 749249423Sdim QualType valueType = E->getType(); 750249423Sdim if (isToAtomic) std::swap(atomicType, valueType); 751249423Sdim 752249423Sdim assert(atomicType->isAtomicType()); 753249423Sdim assert(CGF.getContext().hasSameUnqualifiedType(valueType, 754249423Sdim atomicType->castAs<AtomicType>()->getValueType())); 755249423Sdim 756249423Sdim // Just recurse normally if we're ignoring the result or the 757249423Sdim // atomic type doesn't change representation. 758249423Sdim if (Dest.isIgnored() || !CGF.CGM.isPaddedAtomicType(atomicType)) { 759249423Sdim return Visit(E->getSubExpr()); 760249423Sdim } 761249423Sdim 762249423Sdim CastKind peepholeTarget = 763249423Sdim (isToAtomic ? CK_AtomicToNonAtomic : CK_NonAtomicToAtomic); 764249423Sdim 765249423Sdim // These two cases are reverses of each other; try to peephole them. 766249423Sdim if (Expr *op = findPeephole(E->getSubExpr(), peepholeTarget)) { 767249423Sdim assert(CGF.getContext().hasSameUnqualifiedType(op->getType(), 768249423Sdim E->getType()) && 769249423Sdim "peephole significantly changed types?"); 770249423Sdim return Visit(op); 771249423Sdim } 772249423Sdim 773249423Sdim // If we're converting an r-value of non-atomic type to an r-value 774261991Sdim // of atomic type, just emit directly into the relevant sub-object. 775249423Sdim if (isToAtomic) { 776261991Sdim AggValueSlot valueDest = Dest; 777261991Sdim if (!valueDest.isIgnored() && CGF.CGM.isPaddedAtomicType(atomicType)) { 778341825Sdim // Zero-initialize. (Strictly speaking, we only need to initialize 779261991Sdim // the padding at the end, but this is simpler.) 780261991Sdim if (!Dest.isZeroed()) 781296417Sdim CGF.EmitNullInitialization(Dest.getAddress(), atomicType); 782261991Sdim 783261991Sdim // Build a GEP to refer to the subobject. 784296417Sdim Address valueAddr = 785353358Sdim CGF.Builder.CreateStructGEP(valueDest.getAddress(), 0); 786261991Sdim valueDest = AggValueSlot::forAddr(valueAddr, 787261991Sdim valueDest.getQualifiers(), 788261991Sdim valueDest.isExternallyDestructed(), 789261991Sdim valueDest.requiresGCollection(), 790261991Sdim valueDest.isPotentiallyAliased(), 791341825Sdim AggValueSlot::DoesNotOverlap, 792261991Sdim AggValueSlot::IsZeroed); 793261991Sdim } 794341825Sdim 795261991Sdim CGF.EmitAggExpr(E->getSubExpr(), valueDest); 796249423Sdim return; 797249423Sdim } 798249423Sdim 799249423Sdim // Otherwise, we're converting an atomic type to a non-atomic type. 800261991Sdim // Make an atomic temporary, emit into that, and then copy the value out. 801249423Sdim AggValueSlot atomicSlot = 802249423Sdim CGF.CreateAggTemp(atomicType, "atomic-to-nonatomic.temp"); 803249423Sdim CGF.EmitAggExpr(E->getSubExpr(), atomicSlot); 804249423Sdim 805353358Sdim Address valueAddr = Builder.CreateStructGEP(atomicSlot.getAddress(), 0); 806249423Sdim RValue rvalue = RValue::getAggregate(valueAddr, atomicSlot.isVolatile()); 807249423Sdim return EmitFinalDestCopy(valueType, rvalue); 808249423Sdim } 809353358Sdim case CK_AddressSpaceConversion: 810353358Sdim return Visit(E->getSubExpr()); 811249423Sdim 812239462Sdim case CK_LValueToRValue: 813239462Sdim // If we're loading from a volatile type, force the destination 814239462Sdim // into existence. 815239462Sdim if (E->getSubExpr()->getType().isVolatileQualified()) { 816239462Sdim EnsureDest(E->getType()); 817239462Sdim return Visit(E->getSubExpr()); 818239462Sdim } 819249423Sdim 820327952Sdim LLVM_FALLTHROUGH; 821239462Sdim 822353358Sdim 823212904Sdim case CK_NoOp: 824212904Sdim case CK_UserDefinedConversion: 825212904Sdim case CK_ConstructorConversion: 826198092Srdivacky assert(CGF.getContext().hasSameUnqualifiedType(E->getSubExpr()->getType(), 827198092Srdivacky E->getType()) && 828198092Srdivacky "Implicit cast types must be compatible"); 829198092Srdivacky Visit(E->getSubExpr()); 830198092Srdivacky break; 831341825Sdim 832212904Sdim case CK_LValueBitCast: 833218893Sdim llvm_unreachable("should not be emitting lvalue bitcast as rvalue"); 834221345Sdim 835218893Sdim case CK_Dependent: 836218893Sdim case CK_BitCast: 837218893Sdim case CK_ArrayToPointerDecay: 838218893Sdim case CK_FunctionToPointerDecay: 839218893Sdim case CK_NullToPointer: 840218893Sdim case CK_NullToMemberPointer: 841218893Sdim case CK_BaseToDerivedMemberPointer: 842218893Sdim case CK_DerivedToBaseMemberPointer: 843218893Sdim case CK_MemberPointerToBoolean: 844234353Sdim case CK_ReinterpretMemberPointer: 845218893Sdim case CK_IntegralToPointer: 846218893Sdim case CK_PointerToIntegral: 847218893Sdim case CK_PointerToBoolean: 848218893Sdim case CK_ToVoid: 849218893Sdim case CK_VectorSplat: 850218893Sdim case CK_IntegralCast: 851296417Sdim case CK_BooleanToSignedIntegral: 852218893Sdim case CK_IntegralToBoolean: 853218893Sdim case CK_IntegralToFloating: 854218893Sdim case CK_FloatingToIntegral: 855218893Sdim case CK_FloatingToBoolean: 856218893Sdim case CK_FloatingCast: 857226633Sdim case CK_CPointerToObjCPointerCast: 858226633Sdim case CK_BlockPointerToObjCPointerCast: 859218893Sdim case CK_AnyPointerToBlockPointerCast: 860218893Sdim case CK_ObjCObjectLValueCast: 861218893Sdim case CK_FloatingRealToComplex: 862218893Sdim case CK_FloatingComplexToReal: 863218893Sdim case CK_FloatingComplexToBoolean: 864218893Sdim case CK_FloatingComplexCast: 865218893Sdim case CK_FloatingComplexToIntegralComplex: 866218893Sdim case CK_IntegralRealToComplex: 867218893Sdim case CK_IntegralComplexToReal: 868218893Sdim case CK_IntegralComplexToBoolean: 869218893Sdim case CK_IntegralComplexCast: 870218893Sdim case CK_IntegralComplexToFloatingComplex: 871226633Sdim case CK_ARCProduceObject: 872226633Sdim case CK_ARCConsumeObject: 873226633Sdim case CK_ARCReclaimReturnedObject: 874226633Sdim case CK_ARCExtendBlockObject: 875234353Sdim case CK_CopyAndAutoreleaseBlockObject: 876243830Sdim case CK_BuiltinFnToFnPtr: 877344779Sdim case CK_ZeroToOCLOpaqueType: 878353358Sdim 879314564Sdim case CK_IntToOCLSampler: 880344779Sdim case CK_FixedPointCast: 881344779Sdim case CK_FixedPointToBoolean: 882353358Sdim case CK_FixedPointToIntegral: 883353358Sdim case CK_IntegralToFixedPoint: 884218893Sdim llvm_unreachable("cast kind invalid for aggregate types"); 885198398Srdivacky } 886193326Sed} 887193326Sed 888193326Sedvoid AggExprEmitter::VisitCallExpr(const CallExpr *E) { 889288943Sdim if (E->getCallReturnType(CGF.getContext())->isReferenceType()) { 890193326Sed EmitAggLoadOfLValue(E); 891193326Sed return; 892193326Sed } 893198092Srdivacky 894341825Sdim withReturnValueSlot(E, [&](ReturnValueSlot Slot) { 895341825Sdim return CGF.EmitCallExpr(E, Slot); 896341825Sdim }); 897193326Sed} 898193326Sed 899193326Sedvoid AggExprEmitter::VisitObjCMessageExpr(ObjCMessageExpr *E) { 900341825Sdim withReturnValueSlot(E, [&](ReturnValueSlot Slot) { 901341825Sdim return CGF.EmitObjCMessageExpr(E, Slot); 902341825Sdim }); 903193326Sed} 904193326Sed 905193326Sedvoid AggExprEmitter::VisitBinComma(const BinaryOperator *E) { 906218893Sdim CGF.EmitIgnoredExpr(E->getLHS()); 907218893Sdim Visit(E->getRHS()); 908193326Sed} 909193326Sed 910193326Sedvoid AggExprEmitter::VisitStmtExpr(const StmtExpr *E) { 911218893Sdim CodeGenFunction::StmtExprEvaluation eval(CGF); 912218893Sdim CGF.EmitCompoundStmt(*E->getSubStmt(), true, Dest); 913193326Sed} 914193326Sed 915341825Sdimenum CompareKind { 916341825Sdim CK_Less, 917341825Sdim CK_Greater, 918341825Sdim CK_Equal, 919341825Sdim}; 920341825Sdim 921341825Sdimstatic llvm::Value *EmitCompare(CGBuilderTy &Builder, CodeGenFunction &CGF, 922341825Sdim const BinaryOperator *E, llvm::Value *LHS, 923341825Sdim llvm::Value *RHS, CompareKind Kind, 924341825Sdim const char *NameSuffix = "") { 925341825Sdim QualType ArgTy = E->getLHS()->getType(); 926341825Sdim if (const ComplexType *CT = ArgTy->getAs<ComplexType>()) 927341825Sdim ArgTy = CT->getElementType(); 928341825Sdim 929341825Sdim if (const auto *MPT = ArgTy->getAs<MemberPointerType>()) { 930341825Sdim assert(Kind == CK_Equal && 931341825Sdim "member pointers may only be compared for equality"); 932341825Sdim return CGF.CGM.getCXXABI().EmitMemberPointerComparison( 933341825Sdim CGF, LHS, RHS, MPT, /*IsInequality*/ false); 934341825Sdim } 935341825Sdim 936341825Sdim // Compute the comparison instructions for the specified comparison kind. 937341825Sdim struct CmpInstInfo { 938341825Sdim const char *Name; 939341825Sdim llvm::CmpInst::Predicate FCmp; 940341825Sdim llvm::CmpInst::Predicate SCmp; 941341825Sdim llvm::CmpInst::Predicate UCmp; 942341825Sdim }; 943341825Sdim CmpInstInfo InstInfo = [&]() -> CmpInstInfo { 944341825Sdim using FI = llvm::FCmpInst; 945341825Sdim using II = llvm::ICmpInst; 946341825Sdim switch (Kind) { 947341825Sdim case CK_Less: 948341825Sdim return {"cmp.lt", FI::FCMP_OLT, II::ICMP_SLT, II::ICMP_ULT}; 949341825Sdim case CK_Greater: 950341825Sdim return {"cmp.gt", FI::FCMP_OGT, II::ICMP_SGT, II::ICMP_UGT}; 951341825Sdim case CK_Equal: 952341825Sdim return {"cmp.eq", FI::FCMP_OEQ, II::ICMP_EQ, II::ICMP_EQ}; 953341825Sdim } 954341825Sdim llvm_unreachable("Unrecognised CompareKind enum"); 955341825Sdim }(); 956341825Sdim 957341825Sdim if (ArgTy->hasFloatingRepresentation()) 958341825Sdim return Builder.CreateFCmp(InstInfo.FCmp, LHS, RHS, 959341825Sdim llvm::Twine(InstInfo.Name) + NameSuffix); 960341825Sdim if (ArgTy->isIntegralOrEnumerationType() || ArgTy->isPointerType()) { 961341825Sdim auto Inst = 962341825Sdim ArgTy->hasSignedIntegerRepresentation() ? InstInfo.SCmp : InstInfo.UCmp; 963341825Sdim return Builder.CreateICmp(Inst, LHS, RHS, 964341825Sdim llvm::Twine(InstInfo.Name) + NameSuffix); 965341825Sdim } 966341825Sdim 967341825Sdim llvm_unreachable("unsupported aggregate binary expression should have " 968341825Sdim "already been handled"); 969341825Sdim} 970341825Sdim 971341825Sdimvoid AggExprEmitter::VisitBinCmp(const BinaryOperator *E) { 972341825Sdim using llvm::BasicBlock; 973341825Sdim using llvm::PHINode; 974341825Sdim using llvm::Value; 975341825Sdim assert(CGF.getContext().hasSameType(E->getLHS()->getType(), 976341825Sdim E->getRHS()->getType())); 977341825Sdim const ComparisonCategoryInfo &CmpInfo = 978341825Sdim CGF.getContext().CompCategories.getInfoForType(E->getType()); 979341825Sdim assert(CmpInfo.Record->isTriviallyCopyable() && 980341825Sdim "cannot copy non-trivially copyable aggregate"); 981341825Sdim 982341825Sdim QualType ArgTy = E->getLHS()->getType(); 983341825Sdim 984341825Sdim if (!ArgTy->isIntegralOrEnumerationType() && !ArgTy->isRealFloatingType() && 985341825Sdim !ArgTy->isNullPtrType() && !ArgTy->isPointerType() && 986341825Sdim !ArgTy->isMemberPointerType() && !ArgTy->isAnyComplexType()) { 987341825Sdim return CGF.ErrorUnsupported(E, "aggregate three-way comparison"); 988341825Sdim } 989341825Sdim bool IsComplex = ArgTy->isAnyComplexType(); 990341825Sdim 991341825Sdim // Evaluate the operands to the expression and extract their values. 992341825Sdim auto EmitOperand = [&](Expr *E) -> std::pair<Value *, Value *> { 993341825Sdim RValue RV = CGF.EmitAnyExpr(E); 994341825Sdim if (RV.isScalar()) 995341825Sdim return {RV.getScalarVal(), nullptr}; 996341825Sdim if (RV.isAggregate()) 997341825Sdim return {RV.getAggregatePointer(), nullptr}; 998341825Sdim assert(RV.isComplex()); 999341825Sdim return RV.getComplexVal(); 1000341825Sdim }; 1001341825Sdim auto LHSValues = EmitOperand(E->getLHS()), 1002341825Sdim RHSValues = EmitOperand(E->getRHS()); 1003341825Sdim 1004341825Sdim auto EmitCmp = [&](CompareKind K) { 1005341825Sdim Value *Cmp = EmitCompare(Builder, CGF, E, LHSValues.first, RHSValues.first, 1006341825Sdim K, IsComplex ? ".r" : ""); 1007341825Sdim if (!IsComplex) 1008341825Sdim return Cmp; 1009341825Sdim assert(K == CompareKind::CK_Equal); 1010341825Sdim Value *CmpImag = EmitCompare(Builder, CGF, E, LHSValues.second, 1011341825Sdim RHSValues.second, K, ".i"); 1012341825Sdim return Builder.CreateAnd(Cmp, CmpImag, "and.eq"); 1013341825Sdim }; 1014341825Sdim auto EmitCmpRes = [&](const ComparisonCategoryInfo::ValueInfo *VInfo) { 1015341825Sdim return Builder.getInt(VInfo->getIntValue()); 1016341825Sdim }; 1017341825Sdim 1018341825Sdim Value *Select; 1019341825Sdim if (ArgTy->isNullPtrType()) { 1020341825Sdim Select = EmitCmpRes(CmpInfo.getEqualOrEquiv()); 1021341825Sdim } else if (!CmpInfo.isPartial()) { 1022341825Sdim Value *SelectOne = 1023341825Sdim Builder.CreateSelect(EmitCmp(CK_Less), EmitCmpRes(CmpInfo.getLess()), 1024341825Sdim EmitCmpRes(CmpInfo.getGreater()), "sel.lt"); 1025341825Sdim Select = Builder.CreateSelect(EmitCmp(CK_Equal), 1026341825Sdim EmitCmpRes(CmpInfo.getEqualOrEquiv()), 1027341825Sdim SelectOne, "sel.eq"); 1028341825Sdim } else { 1029341825Sdim Value *SelectEq = Builder.CreateSelect( 1030341825Sdim EmitCmp(CK_Equal), EmitCmpRes(CmpInfo.getEqualOrEquiv()), 1031341825Sdim EmitCmpRes(CmpInfo.getUnordered()), "sel.eq"); 1032341825Sdim Value *SelectGT = Builder.CreateSelect(EmitCmp(CK_Greater), 1033341825Sdim EmitCmpRes(CmpInfo.getGreater()), 1034341825Sdim SelectEq, "sel.gt"); 1035341825Sdim Select = Builder.CreateSelect( 1036341825Sdim EmitCmp(CK_Less), EmitCmpRes(CmpInfo.getLess()), SelectGT, "sel.lt"); 1037341825Sdim } 1038341825Sdim // Create the return value in the destination slot. 1039341825Sdim EnsureDest(E->getType()); 1040341825Sdim LValue DestLV = CGF.MakeAddrLValue(Dest.getAddress(), E->getType()); 1041341825Sdim 1042341825Sdim // Emit the address of the first (and only) field in the comparison category 1043341825Sdim // type, and initialize it from the constant integer value selected above. 1044341825Sdim LValue FieldLV = CGF.EmitLValueForFieldInitialization( 1045341825Sdim DestLV, *CmpInfo.Record->field_begin()); 1046341825Sdim CGF.EmitStoreThroughLValue(RValue::get(Select), FieldLV, /*IsInit*/ true); 1047341825Sdim 1048341825Sdim // All done! The result is in the Dest slot. 1049341825Sdim} 1050341825Sdim 1051193326Sedvoid AggExprEmitter::VisitBinaryOperator(const BinaryOperator *E) { 1052212904Sdim if (E->getOpcode() == BO_PtrMemD || E->getOpcode() == BO_PtrMemI) 1053198398Srdivacky VisitPointerToDataMemberBinaryOperator(E); 1054198398Srdivacky else 1055198398Srdivacky CGF.ErrorUnsupported(E, "aggregate binary expression"); 1056193326Sed} 1057193326Sed 1058198398Srdivackyvoid AggExprEmitter::VisitPointerToDataMemberBinaryOperator( 1059198398Srdivacky const BinaryOperator *E) { 1060198398Srdivacky LValue LV = CGF.EmitPointerToDataMemberBinaryExpr(E); 1061239462Sdim EmitFinalDestCopy(E->getType(), LV); 1062198398Srdivacky} 1063198398Srdivacky 1064239462Sdim/// Is the value of the given expression possibly a reference to or 1065239462Sdim/// into a __block variable? 1066239462Sdimstatic bool isBlockVarRef(const Expr *E) { 1067239462Sdim // Make sure we look through parens. 1068239462Sdim E = E->IgnoreParens(); 1069239462Sdim 1070239462Sdim // Check for a direct reference to a __block variable. 1071239462Sdim if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) { 1072239462Sdim const VarDecl *var = dyn_cast<VarDecl>(DRE->getDecl()); 1073239462Sdim return (var && var->hasAttr<BlocksAttr>()); 1074239462Sdim } 1075239462Sdim 1076239462Sdim // More complicated stuff. 1077239462Sdim 1078239462Sdim // Binary operators. 1079239462Sdim if (const BinaryOperator *op = dyn_cast<BinaryOperator>(E)) { 1080239462Sdim // For an assignment or pointer-to-member operation, just care 1081239462Sdim // about the LHS. 1082239462Sdim if (op->isAssignmentOp() || op->isPtrMemOp()) 1083239462Sdim return isBlockVarRef(op->getLHS()); 1084239462Sdim 1085239462Sdim // For a comma, just care about the RHS. 1086239462Sdim if (op->getOpcode() == BO_Comma) 1087239462Sdim return isBlockVarRef(op->getRHS()); 1088239462Sdim 1089239462Sdim // FIXME: pointer arithmetic? 1090239462Sdim return false; 1091239462Sdim 1092239462Sdim // Check both sides of a conditional operator. 1093239462Sdim } else if (const AbstractConditionalOperator *op 1094239462Sdim = dyn_cast<AbstractConditionalOperator>(E)) { 1095239462Sdim return isBlockVarRef(op->getTrueExpr()) 1096239462Sdim || isBlockVarRef(op->getFalseExpr()); 1097239462Sdim 1098239462Sdim // OVEs are required to support BinaryConditionalOperators. 1099239462Sdim } else if (const OpaqueValueExpr *op 1100239462Sdim = dyn_cast<OpaqueValueExpr>(E)) { 1101239462Sdim if (const Expr *src = op->getSourceExpr()) 1102239462Sdim return isBlockVarRef(src); 1103239462Sdim 1104239462Sdim // Casts are necessary to get things like (*(int*)&var) = foo(). 1105239462Sdim // We don't really care about the kind of cast here, except 1106239462Sdim // we don't want to look through l2r casts, because it's okay 1107239462Sdim // to get the *value* in a __block variable. 1108239462Sdim } else if (const CastExpr *cast = dyn_cast<CastExpr>(E)) { 1109239462Sdim if (cast->getCastKind() == CK_LValueToRValue) 1110239462Sdim return false; 1111239462Sdim return isBlockVarRef(cast->getSubExpr()); 1112239462Sdim 1113239462Sdim // Handle unary operators. Again, just aggressively look through 1114239462Sdim // it, ignoring the operation. 1115239462Sdim } else if (const UnaryOperator *uop = dyn_cast<UnaryOperator>(E)) { 1116239462Sdim return isBlockVarRef(uop->getSubExpr()); 1117239462Sdim 1118239462Sdim // Look into the base of a field access. 1119239462Sdim } else if (const MemberExpr *mem = dyn_cast<MemberExpr>(E)) { 1120239462Sdim return isBlockVarRef(mem->getBase()); 1121239462Sdim 1122239462Sdim // Look into the base of a subscript. 1123239462Sdim } else if (const ArraySubscriptExpr *sub = dyn_cast<ArraySubscriptExpr>(E)) { 1124239462Sdim return isBlockVarRef(sub->getBase()); 1125239462Sdim } 1126239462Sdim 1127239462Sdim return false; 1128239462Sdim} 1129239462Sdim 1130193326Sedvoid AggExprEmitter::VisitBinAssign(const BinaryOperator *E) { 1131193326Sed // For an assignment to work, the value on the right has 1132193326Sed // to be compatible with the value on the left. 1133193326Sed assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(), 1134193326Sed E->getRHS()->getType()) 1135193326Sed && "Invalid assignment"); 1136218893Sdim 1137239462Sdim // If the LHS might be a __block variable, and the RHS can 1138239462Sdim // potentially cause a block copy, we need to evaluate the RHS first 1139239462Sdim // so that the assignment goes the right place. 1140239462Sdim // This is pretty semantically fragile. 1141239462Sdim if (isBlockVarRef(E->getLHS()) && 1142239462Sdim E->getRHS()->HasSideEffects(CGF.getContext())) { 1143239462Sdim // Ensure that we have a destination, and evaluate the RHS into that. 1144239462Sdim EnsureDest(E->getRHS()->getType()); 1145239462Sdim Visit(E->getRHS()); 1146239462Sdim 1147239462Sdim // Now emit the LHS and copy into it. 1148243830Sdim LValue LHS = CGF.EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store); 1149239462Sdim 1150249423Sdim // That copy is an atomic copy if the LHS is atomic. 1151288943Sdim if (LHS.getType()->isAtomicType() || 1152288943Sdim CGF.LValueIsSuitableForInlineAtomic(LHS)) { 1153249423Sdim CGF.EmitAtomicStore(Dest.asRValue(), LHS, /*isInit*/ false); 1154249423Sdim return; 1155249423Sdim } 1156249423Sdim 1157239462Sdim EmitCopy(E->getLHS()->getType(), 1158360784Sdim AggValueSlot::forLValue(LHS, CGF, AggValueSlot::IsDestructed, 1159239462Sdim needsGC(E->getLHS()->getType()), 1160341825Sdim AggValueSlot::IsAliased, 1161341825Sdim AggValueSlot::MayOverlap), 1162239462Sdim Dest); 1163239462Sdim return; 1164239462Sdim } 1165341825Sdim 1166193326Sed LValue LHS = CGF.EmitLValue(E->getLHS()); 1167193326Sed 1168249423Sdim // If we have an atomic type, evaluate into the destination and then 1169249423Sdim // do an atomic copy. 1170288943Sdim if (LHS.getType()->isAtomicType() || 1171288943Sdim CGF.LValueIsSuitableForInlineAtomic(LHS)) { 1172249423Sdim EnsureDest(E->getRHS()->getType()); 1173249423Sdim Visit(E->getRHS()); 1174249423Sdim CGF.EmitAtomicStore(Dest.asRValue(), LHS, /*isInit*/ false); 1175249423Sdim return; 1176249423Sdim } 1177249423Sdim 1178234353Sdim // Codegen the RHS so that it stores directly into the LHS. 1179360784Sdim AggValueSlot LHSSlot = AggValueSlot::forLValue( 1180360784Sdim LHS, CGF, AggValueSlot::IsDestructed, needsGC(E->getLHS()->getType()), 1181360784Sdim AggValueSlot::IsAliased, AggValueSlot::MayOverlap); 1182249423Sdim // A non-volatile aggregate destination might have volatile member. 1183249423Sdim if (!LHSSlot.isVolatile() && 1184249423Sdim CGF.hasVolatileMember(E->getLHS()->getType())) 1185249423Sdim LHSSlot.setVolatile(true); 1186341825Sdim 1187239462Sdim CGF.EmitAggExpr(E->getRHS(), LHSSlot); 1188239462Sdim 1189239462Sdim // Copy into the destination if the assignment isn't ignored. 1190239462Sdim EmitFinalDestCopy(E->getType(), LHS); 1191193326Sed} 1192193326Sed 1193218893Sdimvoid AggExprEmitter:: 1194218893SdimVisitAbstractConditionalOperator(const AbstractConditionalOperator *E) { 1195193326Sed llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true"); 1196193326Sed llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false"); 1197193326Sed llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end"); 1198198092Srdivacky 1199218893Sdim // Bind the common expression if necessary. 1200218893Sdim CodeGenFunction::OpaqueValueMapping binding(CGF, E); 1201218893Sdim 1202218893Sdim CodeGenFunction::ConditionalEvaluation eval(CGF); 1203288943Sdim CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock, 1204288943Sdim CGF.getProfileCount(E)); 1205198092Srdivacky 1206218893Sdim // Save whether the destination's lifetime is externally managed. 1207226633Sdim bool isExternallyDestructed = Dest.isExternallyDestructed(); 1208218893Sdim 1209218893Sdim eval.begin(CGF); 1210193326Sed CGF.EmitBlock(LHSBlock); 1211288943Sdim CGF.incrementProfileCounter(E); 1212218893Sdim Visit(E->getTrueExpr()); 1213218893Sdim eval.end(CGF); 1214198092Srdivacky 1215218893Sdim assert(CGF.HaveInsertPoint() && "expression evaluation ended with no IP!"); 1216218893Sdim CGF.Builder.CreateBr(ContBlock); 1217193326Sed 1218218893Sdim // If the result of an agg expression is unused, then the emission 1219218893Sdim // of the LHS might need to create a destination slot. That's fine 1220218893Sdim // with us, and we can safely emit the RHS into the same slot, but 1221226633Sdim // we shouldn't claim that it's already being destructed. 1222226633Sdim Dest.setExternallyDestructed(isExternallyDestructed); 1223198092Srdivacky 1224218893Sdim eval.begin(CGF); 1225193326Sed CGF.EmitBlock(RHSBlock); 1226218893Sdim Visit(E->getFalseExpr()); 1227218893Sdim eval.end(CGF); 1228198092Srdivacky 1229193326Sed CGF.EmitBlock(ContBlock); 1230193326Sed} 1231193326Sed 1232198092Srdivackyvoid AggExprEmitter::VisitChooseExpr(const ChooseExpr *CE) { 1233261991Sdim Visit(CE->getChosenSubExpr()); 1234198092Srdivacky} 1235198092Srdivacky 1236193326Sedvoid AggExprEmitter::VisitVAArgExpr(VAArgExpr *VE) { 1237296417Sdim Address ArgValue = Address::invalid(); 1238296417Sdim Address ArgPtr = CGF.EmitVAArg(VE, ArgValue); 1239193326Sed 1240309124Sdim // If EmitVAArg fails, emit an error. 1241296417Sdim if (!ArgPtr.isValid()) { 1242309124Sdim CGF.ErrorUnsupported(VE, "aggregate va_arg expression"); 1243193326Sed return; 1244193326Sed } 1245193326Sed 1246239462Sdim EmitFinalDestCopy(VE->getType(), CGF.MakeAddrLValue(ArgPtr, VE->getType())); 1247193326Sed} 1248193326Sed 1249193326Sedvoid AggExprEmitter::VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) { 1250218893Sdim // Ensure that we have a slot, but if we already do, remember 1251226633Sdim // whether it was externally destructed. 1252226633Sdim bool wasExternallyDestructed = Dest.isExternallyDestructed(); 1253239462Sdim EnsureDest(E->getType()); 1254198092Srdivacky 1255226633Sdim // We're going to push a destructor if there isn't already one. 1256226633Sdim Dest.setExternallyDestructed(); 1257226633Sdim 1258218893Sdim Visit(E->getSubExpr()); 1259193326Sed 1260226633Sdim // Push that destructor we promised. 1261226633Sdim if (!wasExternallyDestructed) 1262296417Sdim CGF.EmitCXXTemporary(E->getTemporary(), E->getType(), Dest.getAddress()); 1263193326Sed} 1264193326Sed 1265193326Sedvoid 1266193326SedAggExprEmitter::VisitCXXConstructExpr(const CXXConstructExpr *E) { 1267218893Sdim AggValueSlot Slot = EnsureSlot(E->getType()); 1268218893Sdim CGF.EmitCXXConstructExpr(E, Slot); 1269193326Sed} 1270193326Sed 1271309124Sdimvoid AggExprEmitter::VisitCXXInheritedCtorInitExpr( 1272309124Sdim const CXXInheritedCtorInitExpr *E) { 1273309124Sdim AggValueSlot Slot = EnsureSlot(E->getType()); 1274309124Sdim CGF.EmitInheritedCXXConstructorCall( 1275309124Sdim E->getConstructor(), E->constructsVBase(), Slot.getAddress(), 1276309124Sdim E->inheritedFromVBase(), E); 1277309124Sdim} 1278309124Sdim 1279234353Sdimvoid 1280234353SdimAggExprEmitter::VisitLambdaExpr(LambdaExpr *E) { 1281234353Sdim AggValueSlot Slot = EnsureSlot(E->getType()); 1282353358Sdim LValue SlotLV = CGF.MakeAddrLValue(Slot.getAddress(), E->getType()); 1283353358Sdim 1284353358Sdim // We'll need to enter cleanup scopes in case any of the element 1285353358Sdim // initializers throws an exception. 1286353358Sdim SmallVector<EHScopeStack::stable_iterator, 16> Cleanups; 1287353358Sdim llvm::Instruction *CleanupDominator = nullptr; 1288353358Sdim 1289353358Sdim CXXRecordDecl::field_iterator CurField = E->getLambdaClass()->field_begin(); 1290353358Sdim for (LambdaExpr::const_capture_init_iterator i = E->capture_init_begin(), 1291353358Sdim e = E->capture_init_end(); 1292353358Sdim i != e; ++i, ++CurField) { 1293353358Sdim // Emit initialization 1294353358Sdim LValue LV = CGF.EmitLValueForFieldInitialization(SlotLV, *CurField); 1295353358Sdim if (CurField->hasCapturedVLAType()) { 1296353358Sdim CGF.EmitLambdaVLACapture(CurField->getCapturedVLAType(), LV); 1297353358Sdim continue; 1298353358Sdim } 1299353358Sdim 1300353358Sdim EmitInitializationToLValue(*i, LV); 1301353358Sdim 1302353358Sdim // Push a destructor if necessary. 1303353358Sdim if (QualType::DestructionKind DtorKind = 1304353358Sdim CurField->getType().isDestructedType()) { 1305353358Sdim assert(LV.isSimple()); 1306353358Sdim if (CGF.needsEHCleanup(DtorKind)) { 1307353358Sdim if (!CleanupDominator) 1308353358Sdim CleanupDominator = CGF.Builder.CreateAlignedLoad( 1309353358Sdim CGF.Int8Ty, 1310353358Sdim llvm::Constant::getNullValue(CGF.Int8PtrTy), 1311353358Sdim CharUnits::One()); // placeholder 1312353358Sdim 1313360784Sdim CGF.pushDestroy(EHCleanup, LV.getAddress(CGF), CurField->getType(), 1314353358Sdim CGF.getDestroyer(DtorKind), false); 1315353358Sdim Cleanups.push_back(CGF.EHStack.stable_begin()); 1316353358Sdim } 1317353358Sdim } 1318353358Sdim } 1319353358Sdim 1320353358Sdim // Deactivate all the partial cleanups in reverse order, which 1321353358Sdim // generally means popping them. 1322353358Sdim for (unsigned i = Cleanups.size(); i != 0; --i) 1323353358Sdim CGF.DeactivateCleanupBlock(Cleanups[i-1], CleanupDominator); 1324353358Sdim 1325353358Sdim // Destroy the placeholder if we made one. 1326353358Sdim if (CleanupDominator) 1327353358Sdim CleanupDominator->eraseFromParent(); 1328234353Sdim} 1329234353Sdim 1330218893Sdimvoid AggExprEmitter::VisitExprWithCleanups(ExprWithCleanups *E) { 1331234353Sdim CGF.enterFullExpression(E); 1332234353Sdim CodeGenFunction::RunCleanupsScope cleanups(CGF); 1333234353Sdim Visit(E->getSubExpr()); 1334193326Sed} 1335193326Sed 1336210299Sedvoid AggExprEmitter::VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E) { 1337218893Sdim QualType T = E->getType(); 1338218893Sdim AggValueSlot Slot = EnsureSlot(T); 1339296417Sdim EmitNullInitializationToLValue(CGF.MakeAddrLValue(Slot.getAddress(), T)); 1340198398Srdivacky} 1341198398Srdivacky 1342201361Srdivackyvoid AggExprEmitter::VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) { 1343218893Sdim QualType T = E->getType(); 1344218893Sdim AggValueSlot Slot = EnsureSlot(T); 1345296417Sdim EmitNullInitializationToLValue(CGF.MakeAddrLValue(Slot.getAddress(), T)); 1346218893Sdim} 1347201361Srdivacky 1348218893Sdim/// isSimpleZero - If emitting this value will obviously just cause a store of 1349218893Sdim/// zero to memory, return true. This can return false if uncertain, so it just 1350218893Sdim/// handles simple cases. 1351218893Sdimstatic bool isSimpleZero(const Expr *E, CodeGenFunction &CGF) { 1352221345Sdim E = E->IgnoreParens(); 1353221345Sdim 1354218893Sdim // 0 1355218893Sdim if (const IntegerLiteral *IL = dyn_cast<IntegerLiteral>(E)) 1356218893Sdim return IL->getValue() == 0; 1357218893Sdim // +0.0 1358218893Sdim if (const FloatingLiteral *FL = dyn_cast<FloatingLiteral>(E)) 1359218893Sdim return FL->getValue().isPosZero(); 1360218893Sdim // int() 1361218893Sdim if ((isa<ImplicitValueInitExpr>(E) || isa<CXXScalarValueInitExpr>(E)) && 1362218893Sdim CGF.getTypes().isZeroInitializable(E->getType())) 1363218893Sdim return true; 1364218893Sdim // (int*)0 - Null pointer expressions. 1365218893Sdim if (const CastExpr *ICE = dyn_cast<CastExpr>(E)) 1366314564Sdim return ICE->getCastKind() == CK_NullToPointer && 1367353358Sdim CGF.getTypes().isPointerZeroInitializable(E->getType()) && 1368353358Sdim !E->HasSideEffects(CGF.getContext()); 1369218893Sdim // '\0' 1370218893Sdim if (const CharacterLiteral *CL = dyn_cast<CharacterLiteral>(E)) 1371218893Sdim return CL->getValue() == 0; 1372341825Sdim 1373218893Sdim // Otherwise, hard case: conservatively return false. 1374218893Sdim return false; 1375201361Srdivacky} 1376201361Srdivacky 1377218893Sdim 1378341825Sdimvoid 1379261991SdimAggExprEmitter::EmitInitializationToLValue(Expr *E, LValue LV) { 1380224145Sdim QualType type = LV.getType(); 1381193326Sed // FIXME: Ignore result? 1382193326Sed // FIXME: Are initializers affected by volatile? 1383218893Sdim if (Dest.isZeroed() && isSimpleZero(E, CGF)) { 1384218893Sdim // Storing "i32 0" to a zero'd memory location is a noop. 1385249423Sdim return; 1386249423Sdim } else if (isa<ImplicitValueInitExpr>(E) || isa<CXXScalarValueInitExpr>(E)) { 1387249423Sdim return EmitNullInitializationToLValue(LV); 1388288943Sdim } else if (isa<NoInitExpr>(E)) { 1389288943Sdim // Do nothing. 1390288943Sdim return; 1391224145Sdim } else if (type->isReferenceType()) { 1392261991Sdim RValue RV = CGF.EmitReferenceBindingToExpr(E); 1393249423Sdim return CGF.EmitStoreThroughLValue(RV, LV); 1394249423Sdim } 1395341825Sdim 1396249423Sdim switch (CGF.getEvaluationKind(type)) { 1397249423Sdim case TEK_Complex: 1398249423Sdim CGF.EmitComplexExprIntoLValue(E, LV, /*isInit*/ true); 1399249423Sdim return; 1400249423Sdim case TEK_Aggregate: 1401360784Sdim CGF.EmitAggExpr( 1402360784Sdim E, AggValueSlot::forLValue(LV, CGF, AggValueSlot::IsDestructed, 1403360784Sdim AggValueSlot::DoesNotNeedGCBarriers, 1404360784Sdim AggValueSlot::IsNotAliased, 1405360784Sdim AggValueSlot::MayOverlap, Dest.isZeroed())); 1406249423Sdim return; 1407249423Sdim case TEK_Scalar: 1408249423Sdim if (LV.isSimple()) { 1409276479Sdim CGF.EmitScalarInit(E, /*D=*/nullptr, LV, /*Captured=*/false); 1410249423Sdim } else { 1411249423Sdim CGF.EmitStoreThroughLValue(RValue::get(CGF.EmitScalarExpr(E)), LV); 1412249423Sdim } 1413249423Sdim return; 1414193326Sed } 1415249423Sdim llvm_unreachable("bad evaluation kind"); 1416193326Sed} 1417193326Sed 1418224145Sdimvoid AggExprEmitter::EmitNullInitializationToLValue(LValue lv) { 1419224145Sdim QualType type = lv.getType(); 1420224145Sdim 1421218893Sdim // If the destination slot is already zeroed out before the aggregate is 1422218893Sdim // copied into it, we don't have to emit any zeros here. 1423224145Sdim if (Dest.isZeroed() && CGF.getTypes().isZeroInitializable(type)) 1424218893Sdim return; 1425341825Sdim 1426249423Sdim if (CGF.hasScalarEvaluationKind(type)) { 1427249423Sdim // For non-aggregates, we can store the appropriate null constant. 1428249423Sdim llvm::Value *null = CGF.CGM.EmitNullConstant(type); 1429234353Sdim // Note that the following is not equivalent to 1430234353Sdim // EmitStoreThroughBitfieldLValue for ARC types. 1431234353Sdim if (lv.isBitField()) { 1432234353Sdim CGF.EmitStoreThroughBitfieldLValue(RValue::get(null), lv); 1433234353Sdim } else { 1434234353Sdim assert(lv.isSimple()); 1435234353Sdim CGF.EmitStoreOfScalar(null, lv, /* isInitialization */ true); 1436234353Sdim } 1437193326Sed } else { 1438193326Sed // There's a potential optimization opportunity in combining 1439193326Sed // memsets; that would be easy for arrays, but relatively 1440193326Sed // difficult for structures with the current code. 1441360784Sdim CGF.EmitNullInitialization(lv.getAddress(CGF), lv.getType()); 1442193326Sed } 1443193326Sed} 1444193326Sed 1445193326Sedvoid AggExprEmitter::VisitInitListExpr(InitListExpr *E) { 1446193326Sed#if 0 1447200583Srdivacky // FIXME: Assess perf here? Figure out what cases are worth optimizing here 1448200583Srdivacky // (Length of globals? Chunks of zeroed-out space?). 1449193326Sed // 1450193326Sed // If we can, prefer a copy from a global; this is a lot less code for long 1451193326Sed // globals, and it's easier for the current optimizers to analyze. 1452200583Srdivacky if (llvm::Constant* C = CGF.CGM.EmitConstantExpr(E, E->getType(), &CGF)) { 1453193326Sed llvm::GlobalVariable* GV = 1454200583Srdivacky new llvm::GlobalVariable(CGF.CGM.getModule(), C->getType(), true, 1455200583Srdivacky llvm::GlobalValue::InternalLinkage, C, ""); 1456239462Sdim EmitFinalDestCopy(E->getType(), CGF.MakeAddrLValue(GV, E->getType())); 1457193326Sed return; 1458193326Sed } 1459193326Sed#endif 1460218893Sdim if (E->hadArrayRangeDesignator()) 1461193326Sed CGF.ErrorUnsupported(E, "GNU array range designator extension"); 1462193326Sed 1463314564Sdim if (E->isTransparent()) 1464314564Sdim return Visit(E->getInit(0)); 1465314564Sdim 1466261991Sdim AggValueSlot Dest = EnsureSlot(E->getType()); 1467218893Sdim 1468296417Sdim LValue DestLV = CGF.MakeAddrLValue(Dest.getAddress(), E->getType()); 1469234353Sdim 1470193326Sed // Handle initialization of an array. 1471193326Sed if (E->getType()->isArrayType()) { 1472296417Sdim auto AType = cast<llvm::ArrayType>(Dest.getAddress().getElementType()); 1473338697Sdim EmitArrayInit(Dest.getAddress(), AType, E->getType(), E); 1474193326Sed return; 1475193326Sed } 1476198092Srdivacky 1477193326Sed assert(E->getType()->isRecordType() && "Only support structs/unions here!"); 1478198092Srdivacky 1479193326Sed // Do struct initialization; this code just sets each individual member 1480193326Sed // to the approprate value. This makes bitfield support automatic; 1481193326Sed // the disadvantage is that the generated code is more difficult for 1482193326Sed // the optimizer, especially with bitfields. 1483193326Sed unsigned NumInitElements = E->getNumInits(); 1484224145Sdim RecordDecl *record = E->getType()->castAs<RecordType>()->getDecl(); 1485251662Sdim 1486309124Sdim // We'll need to enter cleanup scopes in case any of the element 1487309124Sdim // initializers throws an exception. 1488309124Sdim SmallVector<EHScopeStack::stable_iterator, 16> cleanups; 1489309124Sdim llvm::Instruction *cleanupDominator = nullptr; 1490353358Sdim auto addCleanup = [&](const EHScopeStack::stable_iterator &cleanup) { 1491353358Sdim cleanups.push_back(cleanup); 1492353358Sdim if (!cleanupDominator) // create placeholder once needed 1493353358Sdim cleanupDominator = CGF.Builder.CreateAlignedLoad( 1494353358Sdim CGF.Int8Ty, llvm::Constant::getNullValue(CGF.Int8PtrTy), 1495353358Sdim CharUnits::One()); 1496353358Sdim }; 1497309124Sdim 1498309124Sdim unsigned curInitIndex = 0; 1499309124Sdim 1500309124Sdim // Emit initialization of base classes. 1501309124Sdim if (auto *CXXRD = dyn_cast<CXXRecordDecl>(record)) { 1502309124Sdim assert(E->getNumInits() >= CXXRD->getNumBases() && 1503309124Sdim "missing initializer for base class"); 1504309124Sdim for (auto &Base : CXXRD->bases()) { 1505309124Sdim assert(!Base.isVirtual() && "should not see vbases here"); 1506309124Sdim auto *BaseRD = Base.getType()->getAsCXXRecordDecl(); 1507309124Sdim Address V = CGF.GetAddressOfDirectBaseInCompleteClass( 1508309124Sdim Dest.getAddress(), CXXRD, BaseRD, 1509309124Sdim /*isBaseVirtual*/ false); 1510341825Sdim AggValueSlot AggSlot = AggValueSlot::forAddr( 1511341825Sdim V, Qualifiers(), 1512341825Sdim AggValueSlot::IsDestructed, 1513341825Sdim AggValueSlot::DoesNotNeedGCBarriers, 1514341825Sdim AggValueSlot::IsNotAliased, 1515353358Sdim CGF.getOverlapForBaseInit(CXXRD, BaseRD, Base.isVirtual())); 1516309124Sdim CGF.EmitAggExpr(E->getInit(curInitIndex++), AggSlot); 1517309124Sdim 1518309124Sdim if (QualType::DestructionKind dtorKind = 1519309124Sdim Base.getType().isDestructedType()) { 1520309124Sdim CGF.pushDestroy(dtorKind, V, Base.getType()); 1521353358Sdim addCleanup(CGF.EHStack.stable_begin()); 1522309124Sdim } 1523309124Sdim } 1524309124Sdim } 1525309124Sdim 1526251662Sdim // Prepare a 'this' for CXXDefaultInitExprs. 1527296417Sdim CodeGenFunction::FieldConstructionScope FCS(CGF, Dest.getAddress()); 1528251662Sdim 1529224145Sdim if (record->isUnion()) { 1530193326Sed // Only initialize one field of a union. The field itself is 1531193326Sed // specified by the initializer list. 1532193326Sed if (!E->getInitializedFieldInUnion()) { 1533193326Sed // Empty union; we have nothing to do. 1534198092Srdivacky 1535193326Sed#ifndef NDEBUG 1536193326Sed // Make sure that it's really an empty and not a failure of 1537193326Sed // semantic analysis. 1538276479Sdim for (const auto *Field : record->fields()) 1539193326Sed assert(Field->isUnnamedBitfield() && "Only unnamed bitfields allowed"); 1540193326Sed#endif 1541193326Sed return; 1542193326Sed } 1543193326Sed 1544193326Sed // FIXME: volatility 1545193326Sed FieldDecl *Field = E->getInitializedFieldInUnion(); 1546218893Sdim 1547234982Sdim LValue FieldLoc = CGF.EmitLValueForFieldInitialization(DestLV, Field); 1548193326Sed if (NumInitElements) { 1549193326Sed // Store the initializer into the field 1550224145Sdim EmitInitializationToLValue(E->getInit(0), FieldLoc); 1551193326Sed } else { 1552218893Sdim // Default-initialize to null. 1553224145Sdim EmitNullInitializationToLValue(FieldLoc); 1554193326Sed } 1555193326Sed 1556193326Sed return; 1557193326Sed } 1558198092Srdivacky 1559193326Sed // Here we iterate over the fields; this makes it simpler to both 1560193326Sed // default-initialize fields and skip over unnamed fields. 1561276479Sdim for (const auto *field : record->fields()) { 1562224145Sdim // We're done once we hit the flexible array member. 1563224145Sdim if (field->getType()->isIncompleteArrayType()) 1564193326Sed break; 1565193326Sed 1566224145Sdim // Always skip anonymous bitfields. 1567224145Sdim if (field->isUnnamedBitfield()) 1568193326Sed continue; 1569193326Sed 1570224145Sdim // We're done if we reach the end of the explicit initializers, we 1571224145Sdim // have a zeroed object, and the rest of the fields are 1572224145Sdim // zero-initializable. 1573224145Sdim if (curInitIndex == NumInitElements && Dest.isZeroed() && 1574218893Sdim CGF.getTypes().isZeroInitializable(E->getType())) 1575218893Sdim break; 1576234982Sdim 1577341825Sdim 1578276479Sdim LValue LV = CGF.EmitLValueForFieldInitialization(DestLV, field); 1579193326Sed // We never generate write-barries for initialized fields. 1580224145Sdim LV.setNonGC(true); 1581341825Sdim 1582224145Sdim if (curInitIndex < NumInitElements) { 1583204962Srdivacky // Store the initializer into the field. 1584224145Sdim EmitInitializationToLValue(E->getInit(curInitIndex++), LV); 1585193326Sed } else { 1586321369Sdim // We're out of initializers; default-initialize to null 1587224145Sdim EmitNullInitializationToLValue(LV); 1588193326Sed } 1589224145Sdim 1590224145Sdim // Push a destructor if necessary. 1591224145Sdim // FIXME: if we have an array of structures, all explicitly 1592224145Sdim // initialized, we can end up pushing a linear number of cleanups. 1593224145Sdim bool pushedCleanup = false; 1594224145Sdim if (QualType::DestructionKind dtorKind 1595224145Sdim = field->getType().isDestructedType()) { 1596224145Sdim assert(LV.isSimple()); 1597224145Sdim if (CGF.needsEHCleanup(dtorKind)) { 1598360784Sdim CGF.pushDestroy(EHCleanup, LV.getAddress(CGF), field->getType(), 1599224145Sdim CGF.getDestroyer(dtorKind), false); 1600353358Sdim addCleanup(CGF.EHStack.stable_begin()); 1601224145Sdim pushedCleanup = true; 1602224145Sdim } 1603224145Sdim } 1604341825Sdim 1605218893Sdim // If the GEP didn't get used because of a dead zero init or something 1606218893Sdim // else, clean it up for -O0 builds and general tidiness. 1607341825Sdim if (!pushedCleanup && LV.isSimple()) 1608218893Sdim if (llvm::GetElementPtrInst *GEP = 1609360784Sdim dyn_cast<llvm::GetElementPtrInst>(LV.getPointer(CGF))) 1610218893Sdim if (GEP->use_empty()) 1611218893Sdim GEP->eraseFromParent(); 1612193326Sed } 1613224145Sdim 1614224145Sdim // Deactivate all the partial cleanups in reverse order, which 1615224145Sdim // generally means popping them. 1616353358Sdim assert((cleanupDominator || cleanups.empty()) && 1617353358Sdim "Missing cleanupDominator before deactivating cleanup blocks"); 1618224145Sdim for (unsigned i = cleanups.size(); i != 0; --i) 1619234353Sdim CGF.DeactivateCleanupBlock(cleanups[i-1], cleanupDominator); 1620234353Sdim 1621234353Sdim // Destroy the placeholder if we made one. 1622234353Sdim if (cleanupDominator) 1623234353Sdim cleanupDominator->eraseFromParent(); 1624193326Sed} 1625193326Sed 1626314564Sdimvoid AggExprEmitter::VisitArrayInitLoopExpr(const ArrayInitLoopExpr *E, 1627314564Sdim llvm::Value *outerBegin) { 1628314564Sdim // Emit the common subexpression. 1629314564Sdim CodeGenFunction::OpaqueValueMapping binding(CGF, E->getCommonExpr()); 1630314564Sdim 1631314564Sdim Address destPtr = EnsureSlot(E->getType()).getAddress(); 1632314564Sdim uint64_t numElements = E->getArraySize().getZExtValue(); 1633314564Sdim 1634314564Sdim if (!numElements) 1635314564Sdim return; 1636314564Sdim 1637314564Sdim // destPtr is an array*. Construct an elementType* by drilling down a level. 1638314564Sdim llvm::Value *zero = llvm::ConstantInt::get(CGF.SizeTy, 0); 1639314564Sdim llvm::Value *indices[] = {zero, zero}; 1640314564Sdim llvm::Value *begin = Builder.CreateInBoundsGEP(destPtr.getPointer(), indices, 1641314564Sdim "arrayinit.begin"); 1642314564Sdim 1643314564Sdim // Prepare to special-case multidimensional array initialization: we avoid 1644314564Sdim // emitting multiple destructor loops in that case. 1645314564Sdim if (!outerBegin) 1646314564Sdim outerBegin = begin; 1647314564Sdim ArrayInitLoopExpr *InnerLoop = dyn_cast<ArrayInitLoopExpr>(E->getSubExpr()); 1648314564Sdim 1649314564Sdim QualType elementType = 1650314564Sdim CGF.getContext().getAsArrayType(E->getType())->getElementType(); 1651314564Sdim CharUnits elementSize = CGF.getContext().getTypeSizeInChars(elementType); 1652314564Sdim CharUnits elementAlign = 1653314564Sdim destPtr.getAlignment().alignmentOfArrayElement(elementSize); 1654314564Sdim 1655314564Sdim llvm::BasicBlock *entryBB = Builder.GetInsertBlock(); 1656314564Sdim llvm::BasicBlock *bodyBB = CGF.createBasicBlock("arrayinit.body"); 1657314564Sdim 1658314564Sdim // Jump into the body. 1659314564Sdim CGF.EmitBlock(bodyBB); 1660314564Sdim llvm::PHINode *index = 1661314564Sdim Builder.CreatePHI(zero->getType(), 2, "arrayinit.index"); 1662314564Sdim index->addIncoming(zero, entryBB); 1663314564Sdim llvm::Value *element = Builder.CreateInBoundsGEP(begin, index); 1664314564Sdim 1665314564Sdim // Prepare for a cleanup. 1666314564Sdim QualType::DestructionKind dtorKind = elementType.isDestructedType(); 1667314564Sdim EHScopeStack::stable_iterator cleanup; 1668314564Sdim if (CGF.needsEHCleanup(dtorKind) && !InnerLoop) { 1669314564Sdim if (outerBegin->getType() != element->getType()) 1670314564Sdim outerBegin = Builder.CreateBitCast(outerBegin, element->getType()); 1671314564Sdim CGF.pushRegularPartialArrayCleanup(outerBegin, element, elementType, 1672314564Sdim elementAlign, 1673314564Sdim CGF.getDestroyer(dtorKind)); 1674314564Sdim cleanup = CGF.EHStack.stable_begin(); 1675314564Sdim } else { 1676314564Sdim dtorKind = QualType::DK_none; 1677314564Sdim } 1678314564Sdim 1679314564Sdim // Emit the actual filler expression. 1680314564Sdim { 1681314564Sdim // Temporaries created in an array initialization loop are destroyed 1682314564Sdim // at the end of each iteration. 1683314564Sdim CodeGenFunction::RunCleanupsScope CleanupsScope(CGF); 1684314564Sdim CodeGenFunction::ArrayInitLoopExprScope Scope(CGF, index); 1685314564Sdim LValue elementLV = 1686314564Sdim CGF.MakeAddrLValue(Address(element, elementAlign), elementType); 1687314564Sdim 1688314564Sdim if (InnerLoop) { 1689314564Sdim // If the subexpression is an ArrayInitLoopExpr, share its cleanup. 1690314564Sdim auto elementSlot = AggValueSlot::forLValue( 1691360784Sdim elementLV, CGF, AggValueSlot::IsDestructed, 1692360784Sdim AggValueSlot::DoesNotNeedGCBarriers, AggValueSlot::IsNotAliased, 1693341825Sdim AggValueSlot::DoesNotOverlap); 1694314564Sdim AggExprEmitter(CGF, elementSlot, false) 1695314564Sdim .VisitArrayInitLoopExpr(InnerLoop, outerBegin); 1696314564Sdim } else 1697314564Sdim EmitInitializationToLValue(E->getSubExpr(), elementLV); 1698314564Sdim } 1699314564Sdim 1700314564Sdim // Move on to the next element. 1701314564Sdim llvm::Value *nextIndex = Builder.CreateNUWAdd( 1702314564Sdim index, llvm::ConstantInt::get(CGF.SizeTy, 1), "arrayinit.next"); 1703314564Sdim index->addIncoming(nextIndex, Builder.GetInsertBlock()); 1704314564Sdim 1705314564Sdim // Leave the loop if we're done. 1706314564Sdim llvm::Value *done = Builder.CreateICmpEQ( 1707314564Sdim nextIndex, llvm::ConstantInt::get(CGF.SizeTy, numElements), 1708314564Sdim "arrayinit.done"); 1709314564Sdim llvm::BasicBlock *endBB = CGF.createBasicBlock("arrayinit.end"); 1710314564Sdim Builder.CreateCondBr(done, endBB, bodyBB); 1711314564Sdim 1712314564Sdim CGF.EmitBlock(endBB); 1713314564Sdim 1714314564Sdim // Leave the partial-array cleanup if we entered one. 1715314564Sdim if (dtorKind) 1716314564Sdim CGF.DeactivateCleanupBlock(cleanup, index); 1717314564Sdim} 1718314564Sdim 1719288943Sdimvoid AggExprEmitter::VisitDesignatedInitUpdateExpr(DesignatedInitUpdateExpr *E) { 1720288943Sdim AggValueSlot Dest = EnsureSlot(E->getType()); 1721288943Sdim 1722296417Sdim LValue DestLV = CGF.MakeAddrLValue(Dest.getAddress(), E->getType()); 1723288943Sdim EmitInitializationToLValue(E->getBase(), DestLV); 1724288943Sdim VisitInitListExpr(E->getUpdater()); 1725288943Sdim} 1726288943Sdim 1727193326Sed//===----------------------------------------------------------------------===// 1728193326Sed// Entry Points into this File 1729193326Sed//===----------------------------------------------------------------------===// 1730193326Sed 1731218893Sdim/// GetNumNonZeroBytesInInit - Get an approximate count of the number of 1732218893Sdim/// non-zero bytes that will be stored when outputting the initializer for the 1733218893Sdim/// specified initializer expression. 1734221345Sdimstatic CharUnits GetNumNonZeroBytesInInit(const Expr *E, CodeGenFunction &CGF) { 1735370359Sgit2svn if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(E)) 1736370359Sgit2svn E = MTE->getSubExpr(); 1737370359Sgit2svn E = E->IgnoreParenNoopCasts(CGF.getContext()); 1738218893Sdim 1739218893Sdim // 0 and 0.0 won't require any non-zero stores! 1740221345Sdim if (isSimpleZero(E, CGF)) return CharUnits::Zero(); 1741218893Sdim 1742218893Sdim // If this is an initlist expr, sum up the size of sizes of the (present) 1743218893Sdim // elements. If this is something weird, assume the whole thing is non-zero. 1744218893Sdim const InitListExpr *ILE = dyn_cast<InitListExpr>(E); 1745341825Sdim while (ILE && ILE->isTransparent()) 1746341825Sdim ILE = dyn_cast<InitListExpr>(ILE->getInit(0)); 1747276479Sdim if (!ILE || !CGF.getTypes().isZeroInitializable(ILE->getType())) 1748221345Sdim return CGF.getContext().getTypeSizeInChars(E->getType()); 1749341825Sdim 1750218893Sdim // InitListExprs for structs have to be handled carefully. If there are 1751218893Sdim // reference members, we need to consider the size of the reference, not the 1752218893Sdim // referencee. InitListExprs for unions and arrays can't have references. 1753218893Sdim if (const RecordType *RT = E->getType()->getAs<RecordType>()) { 1754218893Sdim if (!RT->isUnionType()) { 1755360784Sdim RecordDecl *SD = RT->getDecl(); 1756221345Sdim CharUnits NumNonZeroBytes = CharUnits::Zero(); 1757341825Sdim 1758218893Sdim unsigned ILEElement = 0; 1759309124Sdim if (auto *CXXRD = dyn_cast<CXXRecordDecl>(SD)) 1760309124Sdim while (ILEElement != CXXRD->getNumBases()) 1761309124Sdim NumNonZeroBytes += 1762309124Sdim GetNumNonZeroBytesInInit(ILE->getInit(ILEElement++), CGF); 1763276479Sdim for (const auto *Field : SD->fields()) { 1764218893Sdim // We're done once we hit the flexible array member or run out of 1765218893Sdim // InitListExpr elements. 1766218893Sdim if (Field->getType()->isIncompleteArrayType() || 1767218893Sdim ILEElement == ILE->getNumInits()) 1768218893Sdim break; 1769218893Sdim if (Field->isUnnamedBitfield()) 1770218893Sdim continue; 1771218893Sdim 1772218893Sdim const Expr *E = ILE->getInit(ILEElement++); 1773341825Sdim 1774218893Sdim // Reference values are always non-null and have the width of a pointer. 1775218893Sdim if (Field->getType()->isReferenceType()) 1776221345Sdim NumNonZeroBytes += CGF.getContext().toCharUnitsFromBits( 1777251662Sdim CGF.getTarget().getPointerWidth(0)); 1778218893Sdim else 1779218893Sdim NumNonZeroBytes += GetNumNonZeroBytesInInit(E, CGF); 1780218893Sdim } 1781341825Sdim 1782218893Sdim return NumNonZeroBytes; 1783218893Sdim } 1784218893Sdim } 1785341825Sdim 1786370359Sgit2svn // FIXME: This overestimates the number of non-zero bytes for bit-fields. 1787221345Sdim CharUnits NumNonZeroBytes = CharUnits::Zero(); 1788218893Sdim for (unsigned i = 0, e = ILE->getNumInits(); i != e; ++i) 1789218893Sdim NumNonZeroBytes += GetNumNonZeroBytesInInit(ILE->getInit(i), CGF); 1790218893Sdim return NumNonZeroBytes; 1791218893Sdim} 1792218893Sdim 1793218893Sdim/// CheckAggExprForMemSetUse - If the initializer is large and has a lot of 1794218893Sdim/// zeros in it, emit a memset and avoid storing the individual zeros. 1795218893Sdim/// 1796218893Sdimstatic void CheckAggExprForMemSetUse(AggValueSlot &Slot, const Expr *E, 1797218893Sdim CodeGenFunction &CGF) { 1798218893Sdim // If the slot is already known to be zeroed, nothing to do. Don't mess with 1799218893Sdim // volatile stores. 1800296417Sdim if (Slot.isZeroed() || Slot.isVolatile() || !Slot.getAddress().isValid()) 1801276479Sdim return; 1802221345Sdim 1803221345Sdim // C++ objects with a user-declared constructor don't need zero'ing. 1804243830Sdim if (CGF.getLangOpts().CPlusPlus) 1805221345Sdim if (const RecordType *RT = CGF.getContext() 1806221345Sdim .getBaseElementType(E->getType())->getAs<RecordType>()) { 1807221345Sdim const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 1808221345Sdim if (RD->hasUserDeclaredConstructor()) 1809221345Sdim return; 1810221345Sdim } 1811221345Sdim 1812218893Sdim // If the type is 16-bytes or smaller, prefer individual stores over memset. 1813341825Sdim CharUnits Size = Slot.getPreferredSize(CGF.getContext(), E->getType()); 1814296417Sdim if (Size <= CharUnits::fromQuantity(16)) 1815218893Sdim return; 1816218893Sdim 1817218893Sdim // Check to see if over 3/4 of the initializer are known to be zero. If so, 1818218893Sdim // we prefer to emit memset + individual stores for the rest. 1819221345Sdim CharUnits NumNonZeroBytes = GetNumNonZeroBytesInInit(E, CGF); 1820296417Sdim if (NumNonZeroBytes*4 > Size) 1821218893Sdim return; 1822341825Sdim 1823218893Sdim // Okay, it seems like a good idea to use an initial memset, emit the call. 1824296417Sdim llvm::Constant *SizeVal = CGF.Builder.getInt64(Size.getQuantity()); 1825218893Sdim 1826341825Sdim Address Loc = Slot.getAddress(); 1827296417Sdim Loc = CGF.Builder.CreateElementBitCast(Loc, CGF.Int8Ty); 1828296417Sdim CGF.Builder.CreateMemSet(Loc, CGF.Builder.getInt8(0), SizeVal, false); 1829341825Sdim 1830218893Sdim // Tell the AggExprEmitter that the slot is known zero. 1831218893Sdim Slot.setZeroed(); 1832218893Sdim} 1833218893Sdim 1834218893Sdim 1835218893Sdim 1836218893Sdim 1837193326Sed/// EmitAggExpr - Emit the computation of the specified expression of aggregate 1838193326Sed/// type. The result is computed into DestPtr. Note that if DestPtr is null, 1839193326Sed/// the value of the aggregate expression is not needed. If VolatileDest is 1840193326Sed/// true, DestPtr cannot be 0. 1841239462Sdimvoid CodeGenFunction::EmitAggExpr(const Expr *E, AggValueSlot Slot) { 1842249423Sdim assert(E && hasAggregateEvaluationKind(E->getType()) && 1843193326Sed "Invalid aggregate expression to emit"); 1844296417Sdim assert((Slot.getAddress().isValid() || Slot.isIgnored()) && 1845218893Sdim "slot has bits but no address"); 1846198092Srdivacky 1847218893Sdim // Optimize the slot if possible. 1848218893Sdim CheckAggExprForMemSetUse(Slot, E, *this); 1849341825Sdim 1850288943Sdim AggExprEmitter(*this, Slot, Slot.isIgnored()).Visit(const_cast<Expr*>(E)); 1851193326Sed} 1852193326Sed 1853203955SrdivackyLValue CodeGenFunction::EmitAggExprToLValue(const Expr *E) { 1854249423Sdim assert(hasAggregateEvaluationKind(E->getType()) && "Invalid argument!"); 1855296417Sdim Address Temp = CreateMemTemp(E->getType()); 1856212904Sdim LValue LV = MakeAddrLValue(Temp, E->getType()); 1857360784Sdim EmitAggExpr(E, AggValueSlot::forLValue( 1858360784Sdim LV, *this, AggValueSlot::IsNotDestructed, 1859360784Sdim AggValueSlot::DoesNotNeedGCBarriers, 1860360784Sdim AggValueSlot::IsNotAliased, AggValueSlot::DoesNotOverlap)); 1861212904Sdim return LV; 1862203955Srdivacky} 1863203955Srdivacky 1864353358SdimAggValueSlot::Overlap_t 1865353358SdimCodeGenFunction::getOverlapForFieldInit(const FieldDecl *FD) { 1866353358Sdim if (!FD->hasAttr<NoUniqueAddressAttr>() || !FD->getType()->isRecordType()) 1867353358Sdim return AggValueSlot::DoesNotOverlap; 1868353358Sdim 1869353358Sdim // If the field lies entirely within the enclosing class's nvsize, its tail 1870353358Sdim // padding cannot overlap any already-initialized object. (The only subobjects 1871353358Sdim // with greater addresses that might already be initialized are vbases.) 1872353358Sdim const RecordDecl *ClassRD = FD->getParent(); 1873353358Sdim const ASTRecordLayout &Layout = getContext().getASTRecordLayout(ClassRD); 1874353358Sdim if (Layout.getFieldOffset(FD->getFieldIndex()) + 1875353358Sdim getContext().getTypeSize(FD->getType()) <= 1876353358Sdim (uint64_t)getContext().toBits(Layout.getNonVirtualSize())) 1877353358Sdim return AggValueSlot::DoesNotOverlap; 1878353358Sdim 1879353358Sdim // The tail padding may contain values we need to preserve. 1880353358Sdim return AggValueSlot::MayOverlap; 1881353358Sdim} 1882353358Sdim 1883353358SdimAggValueSlot::Overlap_t CodeGenFunction::getOverlapForBaseInit( 1884341825Sdim const CXXRecordDecl *RD, const CXXRecordDecl *BaseRD, bool IsVirtual) { 1885353358Sdim // If the most-derived object is a field declared with [[no_unique_address]], 1886353358Sdim // the tail padding of any virtual base could be reused for other subobjects 1887353358Sdim // of that field's class. 1888341825Sdim if (IsVirtual) 1889353358Sdim return AggValueSlot::MayOverlap; 1890341825Sdim 1891341825Sdim // If the base class is laid out entirely within the nvsize of the derived 1892341825Sdim // class, its tail padding cannot yet be initialized, so we can issue 1893341825Sdim // stores at the full width of the base class. 1894341825Sdim const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD); 1895341825Sdim if (Layout.getBaseClassOffset(BaseRD) + 1896341825Sdim getContext().getASTRecordLayout(BaseRD).getSize() <= 1897341825Sdim Layout.getNonVirtualSize()) 1898341825Sdim return AggValueSlot::DoesNotOverlap; 1899341825Sdim 1900341825Sdim // The tail padding may contain values we need to preserve. 1901341825Sdim return AggValueSlot::MayOverlap; 1902341825Sdim} 1903341825Sdim 1904341825Sdimvoid CodeGenFunction::EmitAggregateCopy(LValue Dest, LValue Src, QualType Ty, 1905341825Sdim AggValueSlot::Overlap_t MayOverlap, 1906341825Sdim bool isVolatile) { 1907193326Sed assert(!Ty->isAnyComplexType() && "Shouldn't happen for complex"); 1908198092Srdivacky 1909360784Sdim Address DestPtr = Dest.getAddress(*this); 1910360784Sdim Address SrcPtr = Src.getAddress(*this); 1911341825Sdim 1912243830Sdim if (getLangOpts().CPlusPlus) { 1913207619Srdivacky if (const RecordType *RT = Ty->getAs<RecordType>()) { 1914208600Srdivacky CXXRecordDecl *Record = cast<CXXRecordDecl>(RT->getDecl()); 1915341825Sdim assert((Record->hasTrivialCopyConstructor() || 1916226633Sdim Record->hasTrivialCopyAssignment() || 1917226633Sdim Record->hasTrivialMoveConstructor() || 1918288943Sdim Record->hasTrivialMoveAssignment() || 1919370035Sgit2svn Record->hasAttr<TrivialABIAttr>() || Record->isUnion()) && 1920249423Sdim "Trying to aggregate-copy a type without a trivial copy/move " 1921208600Srdivacky "constructor or assignment operator"); 1922208600Srdivacky // Ignore empty classes in C++. 1923208600Srdivacky if (Record->isEmpty()) 1924207619Srdivacky return; 1925207619Srdivacky } 1926207619Srdivacky } 1927341825Sdim 1928193326Sed // Aggregate assignment turns into llvm.memcpy. This is almost valid per 1929193326Sed // C99 6.5.16.1p3, which states "If the value being stored in an object is 1930193326Sed // read from another object that overlaps in anyway the storage of the first 1931193326Sed // object, then the overlap shall be exact and the two objects shall have 1932193326Sed // qualified or unqualified versions of a compatible type." 1933193326Sed // 1934193326Sed // memcpy is not defined if the source and destination pointers are exactly 1935193326Sed // equal, but other compilers do this optimization, and almost every memcpy 1936193326Sed // implementation handles this case safely. If there is a libc that does not 1937193326Sed // safely handle this, we can add a target hook. 1938198092Srdivacky 1939341825Sdim // Get data size info for this aggregate. Don't copy the tail padding if this 1940341825Sdim // might be a potentially-overlapping subobject, since the tail padding might 1941341825Sdim // be occupied by a different object. Otherwise, copying it is fine. 1942243830Sdim std::pair<CharUnits, CharUnits> TypeInfo; 1943341825Sdim if (MayOverlap) 1944243830Sdim TypeInfo = getContext().getTypeInfoDataSizeInChars(Ty); 1945243830Sdim else 1946243830Sdim TypeInfo = getContext().getTypeInfoInChars(Ty); 1947198092Srdivacky 1948288943Sdim llvm::Value *SizeVal = nullptr; 1949288943Sdim if (TypeInfo.first.isZero()) { 1950288943Sdim // But note that getTypeInfo returns 0 for a VLA. 1951288943Sdim if (auto *VAT = dyn_cast_or_null<VariableArrayType>( 1952288943Sdim getContext().getAsArrayType(Ty))) { 1953288943Sdim QualType BaseEltTy; 1954288943Sdim SizeVal = emitArrayLength(VAT, BaseEltTy, DestPtr); 1955341825Sdim TypeInfo = getContext().getTypeInfoInChars(BaseEltTy); 1956288943Sdim assert(!TypeInfo.first.isZero()); 1957288943Sdim SizeVal = Builder.CreateNUWMul( 1958288943Sdim SizeVal, 1959288943Sdim llvm::ConstantInt::get(SizeTy, TypeInfo.first.getQuantity())); 1960288943Sdim } 1961288943Sdim } 1962288943Sdim if (!SizeVal) { 1963288943Sdim SizeVal = llvm::ConstantInt::get(SizeTy, TypeInfo.first.getQuantity()); 1964288943Sdim } 1965198092Srdivacky 1966193326Sed // FIXME: If we have a volatile struct, the optimizer can remove what might 1967193326Sed // appear to be `extra' memory ops: 1968193326Sed // 1969193326Sed // volatile struct { int i; } a, b; 1970193326Sed // 1971193326Sed // int main() { 1972193326Sed // a = b; 1973193326Sed // a = b; 1974193326Sed // } 1975193326Sed // 1976206275Srdivacky // we need to use a different call here. We use isVolatile to indicate when 1977193326Sed // either the source or the destination is volatile. 1978206275Srdivacky 1979296417Sdim DestPtr = Builder.CreateElementBitCast(DestPtr, Int8Ty); 1980296417Sdim SrcPtr = Builder.CreateElementBitCast(SrcPtr, Int8Ty); 1981206275Srdivacky 1982224145Sdim // Don't do any of the memmove_collectable tests if GC isn't set. 1983234353Sdim if (CGM.getLangOpts().getGC() == LangOptions::NonGC) { 1984224145Sdim // fall through 1985224145Sdim } else if (const RecordType *RecordTy = Ty->getAs<RecordType>()) { 1986210299Sed RecordDecl *Record = RecordTy->getDecl(); 1987210299Sed if (Record->hasObjectMember()) { 1988341825Sdim CGM.getObjCRuntime().EmitGCMemmoveCollectable(*this, DestPtr, SrcPtr, 1989210299Sed SizeVal); 1990210299Sed return; 1991210299Sed } 1992224145Sdim } else if (Ty->isArrayType()) { 1993210299Sed QualType BaseType = getContext().getBaseElementType(Ty); 1994210299Sed if (const RecordType *RecordTy = BaseType->getAs<RecordType>()) { 1995210299Sed if (RecordTy->getDecl()->hasObjectMember()) { 1996341825Sdim CGM.getObjCRuntime().EmitGCMemmoveCollectable(*this, DestPtr, SrcPtr, 1997210299Sed SizeVal); 1998210299Sed return; 1999210299Sed } 2000210299Sed } 2001210299Sed } 2002243830Sdim 2003296417Sdim auto Inst = Builder.CreateMemCpy(DestPtr, SrcPtr, SizeVal, isVolatile); 2004296417Sdim 2005243830Sdim // Determine the metadata to describe the position of any padding in this 2006243830Sdim // memcpy, as well as the TBAA tags for the members of the struct, in case 2007243830Sdim // the optimizer wishes to expand it in to scalar memory operations. 2008296417Sdim if (llvm::MDNode *TBAAStructTag = CGM.getTBAAStructInfo(Ty)) 2009296417Sdim Inst->setMetadata(llvm::LLVMContext::MD_tbaa_struct, TBAAStructTag); 2010341825Sdim 2011341825Sdim if (CGM.getCodeGenOpts().NewStructPathTBAA) { 2012341825Sdim TBAAAccessInfo TBAAInfo = CGM.mergeTBAAInfoForMemoryTransfer( 2013341825Sdim Dest.getTBAAInfo(), Src.getTBAAInfo()); 2014341825Sdim CGM.DecorateInstructionWithTBAA(Inst, TBAAInfo); 2015341825Sdim } 2016193326Sed} 2017