1 //===--- CGDecl.cpp - Emit LLVM Code for declarations ---------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This contains code to emit Decl nodes as LLVM code.
12 //===----------------------------------------------------------------------===//
14 #include "CodeGenFunction.h"
17 #include "CGCleanup.h"
18 #include "CGDebugInfo.h"
19 #include "CGOpenCLRuntime.h"
20 #include "CGOpenMPRuntime.h"
21 #include "CodeGenModule.h"
22 #include "clang/AST/ASTContext.h"
23 #include "clang/AST/CharUnits.h"
24 #include "clang/AST/Decl.h"
25 #include "clang/AST/DeclObjC.h"
26 #include "clang/AST/DeclOpenMP.h"
27 #include "clang/Basic/SourceManager.h"
28 #include "clang/Basic/TargetInfo.h"
29 #include "clang/CodeGen/CGFunctionInfo.h"
30 #include "clang/Frontend/CodeGenOptions.h"
31 #include "llvm/IR/DataLayout.h"
32 #include "llvm/IR/GlobalVariable.h"
33 #include "llvm/IR/Intrinsics.h"
34 #include "llvm/IR/Type.h"
36 using namespace clang;
37 using namespace CodeGen;
39 void CodeGenFunction::EmitDecl(const Decl &D) {
40 switch (D.getKind()) {
41 case Decl::BuiltinTemplate:
42 case Decl::TranslationUnit:
43 case Decl::ExternCContext:
45 case Decl::UnresolvedUsingTypename:
46 case Decl::ClassTemplateSpecialization:
47 case Decl::ClassTemplatePartialSpecialization:
48 case Decl::VarTemplateSpecialization:
49 case Decl::VarTemplatePartialSpecialization:
50 case Decl::TemplateTypeParm:
51 case Decl::UnresolvedUsingValue:
52 case Decl::NonTypeTemplateParm:
53 case Decl::CXXDeductionGuide:
55 case Decl::CXXConstructor:
56 case Decl::CXXDestructor:
57 case Decl::CXXConversion:
59 case Decl::MSProperty:
60 case Decl::IndirectField:
62 case Decl::ObjCAtDefsField:
64 case Decl::ImplicitParam:
65 case Decl::ClassTemplate:
66 case Decl::VarTemplate:
67 case Decl::FunctionTemplate:
68 case Decl::TypeAliasTemplate:
69 case Decl::TemplateTemplateParm:
70 case Decl::ObjCMethod:
71 case Decl::ObjCCategory:
72 case Decl::ObjCProtocol:
73 case Decl::ObjCInterface:
74 case Decl::ObjCCategoryImpl:
75 case Decl::ObjCImplementation:
76 case Decl::ObjCProperty:
77 case Decl::ObjCCompatibleAlias:
78 case Decl::PragmaComment:
79 case Decl::PragmaDetectMismatch:
80 case Decl::AccessSpec:
81 case Decl::LinkageSpec:
83 case Decl::ObjCPropertyImpl:
84 case Decl::FileScopeAsm:
86 case Decl::FriendTemplate:
89 case Decl::ClassScopeFunctionSpecialization:
90 case Decl::UsingShadow:
91 case Decl::ConstructorUsingShadow:
92 case Decl::ObjCTypeParam:
94 llvm_unreachable("Declaration should not be in declstmts!");
95 case Decl::Function: // void X();
96 case Decl::Record: // struct/union/class X;
97 case Decl::Enum: // enum X;
98 case Decl::EnumConstant: // enum ? { X = ? }
99 case Decl::CXXRecord: // struct/union/class X; [C++]
100 case Decl::StaticAssert: // static_assert(X, ""); [C++0x]
101 case Decl::Label: // __label__ x;
103 case Decl::OMPThreadPrivate:
104 case Decl::OMPCapturedExpr:
106 // None of these decls require codegen support.
109 case Decl::NamespaceAlias:
110 if (CGDebugInfo *DI = getDebugInfo())
111 DI->EmitNamespaceAlias(cast<NamespaceAliasDecl>(D));
113 case Decl::Using: // using X; [C++]
114 if (CGDebugInfo *DI = getDebugInfo())
115 DI->EmitUsingDecl(cast<UsingDecl>(D));
117 case Decl::UsingPack:
118 for (auto *Using : cast<UsingPackDecl>(D).expansions())
121 case Decl::UsingDirective: // using namespace X; [C++]
122 if (CGDebugInfo *DI = getDebugInfo())
123 DI->EmitUsingDirective(cast<UsingDirectiveDecl>(D));
126 case Decl::Decomposition: {
127 const VarDecl &VD = cast<VarDecl>(D);
128 assert(VD.isLocalVarDecl() &&
129 "Should not see file-scope variables inside a function!");
131 if (auto *DD = dyn_cast<DecompositionDecl>(&VD))
132 for (auto *B : DD->bindings())
133 if (auto *HD = B->getHoldingVar())
138 case Decl::OMPDeclareReduction:
139 return CGM.EmitOMPDeclareReduction(cast<OMPDeclareReductionDecl>(&D), this);
141 case Decl::Typedef: // typedef int X;
142 case Decl::TypeAlias: { // using X = int; [C++0x]
143 const TypedefNameDecl &TD = cast<TypedefNameDecl>(D);
144 QualType Ty = TD.getUnderlyingType();
146 if (Ty->isVariablyModifiedType())
147 EmitVariablyModifiedType(Ty);
152 /// EmitVarDecl - This method handles emission of any variable declaration
153 /// inside a function, including static vars etc.
154 void CodeGenFunction::EmitVarDecl(const VarDecl &D) {
155 if (D.isStaticLocal()) {
156 llvm::GlobalValue::LinkageTypes Linkage =
157 CGM.getLLVMLinkageVarDefinition(&D, /*isConstant=*/false);
159 // FIXME: We need to force the emission/use of a guard variable for
160 // some variables even if we can constant-evaluate them because
161 // we can't guarantee every translation unit will constant-evaluate them.
163 return EmitStaticVarDecl(D, Linkage);
166 if (D.hasExternalStorage())
167 // Don't emit it now, allow it to be emitted lazily on its first use.
170 if (D.getType().getAddressSpace() == LangAS::opencl_local)
171 return CGM.getOpenCLRuntime().EmitWorkGroupLocalVarDecl(*this, D);
173 assert(D.hasLocalStorage());
174 return EmitAutoVarDecl(D);
177 static std::string getStaticDeclName(CodeGenModule &CGM, const VarDecl &D) {
178 if (CGM.getLangOpts().CPlusPlus)
179 return CGM.getMangledName(&D).str();
181 // If this isn't C++, we don't need a mangled name, just a pretty one.
182 assert(!D.isExternallyVisible() && "name shouldn't matter");
183 std::string ContextName;
184 const DeclContext *DC = D.getDeclContext();
185 if (auto *CD = dyn_cast<CapturedDecl>(DC))
186 DC = cast<DeclContext>(CD->getNonClosureContext());
187 if (const auto *FD = dyn_cast<FunctionDecl>(DC))
188 ContextName = CGM.getMangledName(FD);
189 else if (const auto *BD = dyn_cast<BlockDecl>(DC))
190 ContextName = CGM.getBlockMangledName(GlobalDecl(), BD);
191 else if (const auto *OMD = dyn_cast<ObjCMethodDecl>(DC))
192 ContextName = OMD->getSelector().getAsString();
194 llvm_unreachable("Unknown context for static var decl");
196 ContextName += "." + D.getNameAsString();
200 llvm::Constant *CodeGenModule::getOrCreateStaticVarDecl(
201 const VarDecl &D, llvm::GlobalValue::LinkageTypes Linkage) {
202 // In general, we don't always emit static var decls once before we reference
203 // them. It is possible to reference them before emitting the function that
204 // contains them, and it is possible to emit the containing function multiple
206 if (llvm::Constant *ExistingGV = StaticLocalDeclMap[&D])
209 QualType Ty = D.getType();
210 assert(Ty->isConstantSizeType() && "VLAs can't be static");
212 // Use the label if the variable is renamed with the asm-label extension.
214 if (D.hasAttr<AsmLabelAttr>())
215 Name = getMangledName(&D);
217 Name = getStaticDeclName(*this, D);
219 llvm::Type *LTy = getTypes().ConvertTypeForMem(Ty);
221 GetGlobalVarAddressSpace(&D, getContext().getTargetAddressSpace(Ty));
223 // Local address space cannot have an initializer.
224 llvm::Constant *Init = nullptr;
225 if (Ty.getAddressSpace() != LangAS::opencl_local)
226 Init = EmitNullConstant(Ty);
228 Init = llvm::UndefValue::get(LTy);
230 llvm::GlobalVariable *GV =
231 new llvm::GlobalVariable(getModule(), LTy,
232 Ty.isConstant(getContext()), Linkage,
234 llvm::GlobalVariable::NotThreadLocal,
236 GV->setAlignment(getContext().getDeclAlign(&D).getQuantity());
237 setGlobalVisibility(GV, &D);
239 if (supportsCOMDAT() && GV->isWeakForLinker())
240 GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
245 if (D.isExternallyVisible()) {
246 if (D.hasAttr<DLLImportAttr>())
247 GV->setDLLStorageClass(llvm::GlobalVariable::DLLImportStorageClass);
248 else if (D.hasAttr<DLLExportAttr>())
249 GV->setDLLStorageClass(llvm::GlobalVariable::DLLExportStorageClass);
252 // Make sure the result is of the correct type.
253 unsigned ExpectedAddrSpace = getContext().getTargetAddressSpace(Ty);
254 llvm::Constant *Addr = GV;
255 if (AddrSpace != ExpectedAddrSpace) {
256 llvm::PointerType *PTy = llvm::PointerType::get(LTy, ExpectedAddrSpace);
257 Addr = llvm::ConstantExpr::getAddrSpaceCast(GV, PTy);
260 setStaticLocalDeclAddress(&D, Addr);
262 // Ensure that the static local gets initialized by making sure the parent
263 // function gets emitted eventually.
264 const Decl *DC = cast<Decl>(D.getDeclContext());
266 // We can't name blocks or captured statements directly, so try to emit their
268 if (isa<BlockDecl>(DC) || isa<CapturedDecl>(DC)) {
269 DC = DC->getNonClosureContext();
270 // FIXME: Ensure that global blocks get emitted.
276 if (const auto *CD = dyn_cast<CXXConstructorDecl>(DC))
277 GD = GlobalDecl(CD, Ctor_Base);
278 else if (const auto *DD = dyn_cast<CXXDestructorDecl>(DC))
279 GD = GlobalDecl(DD, Dtor_Base);
280 else if (const auto *FD = dyn_cast<FunctionDecl>(DC))
283 // Don't do anything for Obj-C method decls or global closures. We should
285 assert(isa<ObjCMethodDecl>(DC) && "unexpected parent code decl");
288 (void)GetAddrOfGlobal(GD);
293 /// hasNontrivialDestruction - Determine whether a type's destruction is
294 /// non-trivial. If so, and the variable uses static initialization, we must
295 /// register its destructor to run on exit.
296 static bool hasNontrivialDestruction(QualType T) {
297 CXXRecordDecl *RD = T->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
298 return RD && !RD->hasTrivialDestructor();
301 /// AddInitializerToStaticVarDecl - Add the initializer for 'D' to the
302 /// global variable that has already been created for it. If the initializer
303 /// has a different type than GV does, this may free GV and return a different
304 /// one. Otherwise it just returns GV.
305 llvm::GlobalVariable *
306 CodeGenFunction::AddInitializerToStaticVarDecl(const VarDecl &D,
307 llvm::GlobalVariable *GV) {
308 llvm::Constant *Init = CGM.EmitConstantInit(D, this);
310 // If constant emission failed, then this should be a C++ static
313 if (!getLangOpts().CPlusPlus)
314 CGM.ErrorUnsupported(D.getInit(), "constant l-value expression");
315 else if (HaveInsertPoint()) {
316 // Since we have a static initializer, this global variable can't
318 GV->setConstant(false);
320 EmitCXXGuardedInit(D, GV, /*PerformInit*/true);
325 // The initializer may differ in type from the global. Rewrite
326 // the global to match the initializer. (We have to do this
327 // because some types, like unions, can't be completely represented
328 // in the LLVM type system.)
329 if (GV->getType()->getElementType() != Init->getType()) {
330 llvm::GlobalVariable *OldGV = GV;
332 GV = new llvm::GlobalVariable(CGM.getModule(), Init->getType(),
334 OldGV->getLinkage(), Init, "",
335 /*InsertBefore*/ OldGV,
336 OldGV->getThreadLocalMode(),
337 CGM.getContext().getTargetAddressSpace(D.getType()));
338 GV->setVisibility(OldGV->getVisibility());
339 GV->setComdat(OldGV->getComdat());
341 // Steal the name of the old global
344 // Replace all uses of the old global with the new global
345 llvm::Constant *NewPtrForOldDecl =
346 llvm::ConstantExpr::getBitCast(GV, OldGV->getType());
347 OldGV->replaceAllUsesWith(NewPtrForOldDecl);
349 // Erase the old global, since it is no longer used.
350 OldGV->eraseFromParent();
353 GV->setConstant(CGM.isTypeConstant(D.getType(), true));
354 GV->setInitializer(Init);
356 if (hasNontrivialDestruction(D.getType()) && HaveInsertPoint()) {
357 // We have a constant initializer, but a nontrivial destructor. We still
358 // need to perform a guarded "initialization" in order to register the
360 EmitCXXGuardedInit(D, GV, /*PerformInit*/false);
366 void CodeGenFunction::EmitStaticVarDecl(const VarDecl &D,
367 llvm::GlobalValue::LinkageTypes Linkage) {
368 // Check to see if we already have a global variable for this
369 // declaration. This can happen when double-emitting function
370 // bodies, e.g. with complete and base constructors.
371 llvm::Constant *addr = CGM.getOrCreateStaticVarDecl(D, Linkage);
372 CharUnits alignment = getContext().getDeclAlign(&D);
374 // Store into LocalDeclMap before generating initializer to handle
375 // circular references.
376 setAddrOfLocalVar(&D, Address(addr, alignment));
378 // We can't have a VLA here, but we can have a pointer to a VLA,
379 // even though that doesn't really make any sense.
380 // Make sure to evaluate VLA bounds now so that we have them for later.
381 if (D.getType()->isVariablyModifiedType())
382 EmitVariablyModifiedType(D.getType());
384 // Save the type in case adding the initializer forces a type change.
385 llvm::Type *expectedType = addr->getType();
387 llvm::GlobalVariable *var =
388 cast<llvm::GlobalVariable>(addr->stripPointerCasts());
390 // CUDA's local and local static __shared__ variables should not
391 // have any non-empty initializers. This is ensured by Sema.
392 // Whatever initializer such variable may have when it gets here is
393 // a no-op and should not be emitted.
394 bool isCudaSharedVar = getLangOpts().CUDA && getLangOpts().CUDAIsDevice &&
395 D.hasAttr<CUDASharedAttr>();
396 // If this value has an initializer, emit it.
397 if (D.getInit() && !isCudaSharedVar)
398 var = AddInitializerToStaticVarDecl(D, var);
400 var->setAlignment(alignment.getQuantity());
402 if (D.hasAttr<AnnotateAttr>())
403 CGM.AddGlobalAnnotations(&D, var);
405 if (const SectionAttr *SA = D.getAttr<SectionAttr>())
406 var->setSection(SA->getName());
408 if (D.hasAttr<UsedAttr>())
409 CGM.addUsedGlobal(var);
411 // We may have to cast the constant because of the initializer
414 // FIXME: It is really dangerous to store this in the map; if anyone
415 // RAUW's the GV uses of this constant will be invalid.
416 llvm::Constant *castedAddr =
417 llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(var, expectedType);
418 if (var != castedAddr)
419 LocalDeclMap.find(&D)->second = Address(castedAddr, alignment);
420 CGM.setStaticLocalDeclAddress(&D, castedAddr);
422 CGM.getSanitizerMetadata()->reportGlobalToASan(var, D);
424 // Emit global variable debug descriptor for static vars.
425 CGDebugInfo *DI = getDebugInfo();
427 CGM.getCodeGenOpts().getDebugInfo() >= codegenoptions::LimitedDebugInfo) {
428 DI->setLocation(D.getLocation());
429 DI->EmitGlobalVariable(var, &D);
434 struct DestroyObject final : EHScopeStack::Cleanup {
435 DestroyObject(Address addr, QualType type,
436 CodeGenFunction::Destroyer *destroyer,
437 bool useEHCleanupForArray)
438 : addr(addr), type(type), destroyer(destroyer),
439 useEHCleanupForArray(useEHCleanupForArray) {}
443 CodeGenFunction::Destroyer *destroyer;
444 bool useEHCleanupForArray;
446 void Emit(CodeGenFunction &CGF, Flags flags) override {
447 // Don't use an EH cleanup recursively from an EH cleanup.
448 bool useEHCleanupForArray =
449 flags.isForNormalCleanup() && this->useEHCleanupForArray;
451 CGF.emitDestroy(addr, type, destroyer, useEHCleanupForArray);
455 struct DestroyNRVOVariable final : EHScopeStack::Cleanup {
456 DestroyNRVOVariable(Address addr,
457 const CXXDestructorDecl *Dtor,
458 llvm::Value *NRVOFlag)
459 : Dtor(Dtor), NRVOFlag(NRVOFlag), Loc(addr) {}
461 const CXXDestructorDecl *Dtor;
462 llvm::Value *NRVOFlag;
465 void Emit(CodeGenFunction &CGF, Flags flags) override {
466 // Along the exceptions path we always execute the dtor.
467 bool NRVO = flags.isForNormalCleanup() && NRVOFlag;
469 llvm::BasicBlock *SkipDtorBB = nullptr;
471 // If we exited via NRVO, we skip the destructor call.
472 llvm::BasicBlock *RunDtorBB = CGF.createBasicBlock("nrvo.unused");
473 SkipDtorBB = CGF.createBasicBlock("nrvo.skipdtor");
474 llvm::Value *DidNRVO =
475 CGF.Builder.CreateFlagLoad(NRVOFlag, "nrvo.val");
476 CGF.Builder.CreateCondBr(DidNRVO, SkipDtorBB, RunDtorBB);
477 CGF.EmitBlock(RunDtorBB);
480 CGF.EmitCXXDestructorCall(Dtor, Dtor_Complete,
481 /*ForVirtualBase=*/false,
482 /*Delegating=*/false,
485 if (NRVO) CGF.EmitBlock(SkipDtorBB);
489 struct CallStackRestore final : EHScopeStack::Cleanup {
491 CallStackRestore(Address Stack) : Stack(Stack) {}
492 void Emit(CodeGenFunction &CGF, Flags flags) override {
493 llvm::Value *V = CGF.Builder.CreateLoad(Stack);
494 llvm::Value *F = CGF.CGM.getIntrinsic(llvm::Intrinsic::stackrestore);
495 CGF.Builder.CreateCall(F, V);
499 struct ExtendGCLifetime final : EHScopeStack::Cleanup {
501 ExtendGCLifetime(const VarDecl *var) : Var(*var) {}
503 void Emit(CodeGenFunction &CGF, Flags flags) override {
504 // Compute the address of the local variable, in case it's a
505 // byref or something.
506 DeclRefExpr DRE(const_cast<VarDecl*>(&Var), false,
507 Var.getType(), VK_LValue, SourceLocation());
508 llvm::Value *value = CGF.EmitLoadOfScalar(CGF.EmitDeclRefLValue(&DRE),
510 CGF.EmitExtendGCLifetime(value);
514 struct CallCleanupFunction final : EHScopeStack::Cleanup {
515 llvm::Constant *CleanupFn;
516 const CGFunctionInfo &FnInfo;
519 CallCleanupFunction(llvm::Constant *CleanupFn, const CGFunctionInfo *Info,
521 : CleanupFn(CleanupFn), FnInfo(*Info), Var(*Var) {}
523 void Emit(CodeGenFunction &CGF, Flags flags) override {
524 DeclRefExpr DRE(const_cast<VarDecl*>(&Var), false,
525 Var.getType(), VK_LValue, SourceLocation());
526 // Compute the address of the local variable, in case it's a byref
528 llvm::Value *Addr = CGF.EmitDeclRefLValue(&DRE).getPointer();
530 // In some cases, the type of the function argument will be different from
531 // the type of the pointer. An example of this is
532 // void f(void* arg);
533 // __attribute__((cleanup(f))) void *g;
535 // To fix this we insert a bitcast here.
536 QualType ArgTy = FnInfo.arg_begin()->type;
538 CGF.Builder.CreateBitCast(Addr, CGF.ConvertType(ArgTy));
541 Args.add(RValue::get(Arg),
542 CGF.getContext().getPointerType(Var.getType()));
543 auto Callee = CGCallee::forDirect(CleanupFn);
544 CGF.EmitCall(FnInfo, Callee, ReturnValueSlot(), Args);
547 } // end anonymous namespace
549 /// EmitAutoVarWithLifetime - Does the setup required for an automatic
550 /// variable with lifetime.
551 static void EmitAutoVarWithLifetime(CodeGenFunction &CGF, const VarDecl &var,
553 Qualifiers::ObjCLifetime lifetime) {
555 case Qualifiers::OCL_None:
556 llvm_unreachable("present but none");
558 case Qualifiers::OCL_ExplicitNone:
562 case Qualifiers::OCL_Strong: {
563 CodeGenFunction::Destroyer *destroyer =
564 (var.hasAttr<ObjCPreciseLifetimeAttr>()
565 ? CodeGenFunction::destroyARCStrongPrecise
566 : CodeGenFunction::destroyARCStrongImprecise);
568 CleanupKind cleanupKind = CGF.getARCCleanupKind();
569 CGF.pushDestroy(cleanupKind, addr, var.getType(), destroyer,
570 cleanupKind & EHCleanup);
573 case Qualifiers::OCL_Autoreleasing:
577 case Qualifiers::OCL_Weak:
578 // __weak objects always get EH cleanups; otherwise, exceptions
579 // could cause really nasty crashes instead of mere leaks.
580 CGF.pushDestroy(NormalAndEHCleanup, addr, var.getType(),
581 CodeGenFunction::destroyARCWeak,
582 /*useEHCleanup*/ true);
587 static bool isAccessedBy(const VarDecl &var, const Stmt *s) {
588 if (const Expr *e = dyn_cast<Expr>(s)) {
589 // Skip the most common kinds of expressions that make
590 // hierarchy-walking expensive.
591 s = e = e->IgnoreParenCasts();
593 if (const DeclRefExpr *ref = dyn_cast<DeclRefExpr>(e))
594 return (ref->getDecl() == &var);
595 if (const BlockExpr *be = dyn_cast<BlockExpr>(e)) {
596 const BlockDecl *block = be->getBlockDecl();
597 for (const auto &I : block->captures()) {
598 if (I.getVariable() == &var)
604 for (const Stmt *SubStmt : s->children())
605 // SubStmt might be null; as in missing decl or conditional of an if-stmt.
606 if (SubStmt && isAccessedBy(var, SubStmt))
612 static bool isAccessedBy(const ValueDecl *decl, const Expr *e) {
613 if (!decl) return false;
614 if (!isa<VarDecl>(decl)) return false;
615 const VarDecl *var = cast<VarDecl>(decl);
616 return isAccessedBy(*var, e);
619 static bool tryEmitARCCopyWeakInit(CodeGenFunction &CGF,
620 const LValue &destLV, const Expr *init) {
621 bool needsCast = false;
623 while (auto castExpr = dyn_cast<CastExpr>(init->IgnoreParens())) {
624 switch (castExpr->getCastKind()) {
625 // Look through casts that don't require representation changes.
628 case CK_BlockPointerToObjCPointerCast:
632 // If we find an l-value to r-value cast from a __weak variable,
633 // emit this operation as a copy or move.
634 case CK_LValueToRValue: {
635 const Expr *srcExpr = castExpr->getSubExpr();
636 if (srcExpr->getType().getObjCLifetime() != Qualifiers::OCL_Weak)
639 // Emit the source l-value.
640 LValue srcLV = CGF.EmitLValue(srcExpr);
642 // Handle a formal type change to avoid asserting.
643 auto srcAddr = srcLV.getAddress();
645 srcAddr = CGF.Builder.CreateElementBitCast(srcAddr,
646 destLV.getAddress().getElementType());
649 // If it was an l-value, use objc_copyWeak.
650 if (srcExpr->getValueKind() == VK_LValue) {
651 CGF.EmitARCCopyWeak(destLV.getAddress(), srcAddr);
653 assert(srcExpr->getValueKind() == VK_XValue);
654 CGF.EmitARCMoveWeak(destLV.getAddress(), srcAddr);
659 // Stop at anything else.
664 init = castExpr->getSubExpr();
669 static void drillIntoBlockVariable(CodeGenFunction &CGF,
671 const VarDecl *var) {
672 lvalue.setAddress(CGF.emitBlockByrefAddress(lvalue.getAddress(), var));
675 void CodeGenFunction::EmitNullabilityCheck(LValue LHS, llvm::Value *RHS,
676 SourceLocation Loc) {
677 if (!SanOpts.has(SanitizerKind::NullabilityAssign))
680 auto Nullability = LHS.getType()->getNullability(getContext());
681 if (!Nullability || *Nullability != NullabilityKind::NonNull)
684 // Check if the right hand side of the assignment is nonnull, if the left
685 // hand side must be nonnull.
686 SanitizerScope SanScope(this);
687 llvm::Value *IsNotNull = Builder.CreateIsNotNull(RHS);
688 llvm::Constant *StaticData[] = {
689 EmitCheckSourceLocation(Loc), EmitCheckTypeDescriptor(LHS.getType()),
690 llvm::ConstantInt::get(Int8Ty, 0), // The LogAlignment info is unused.
691 llvm::ConstantInt::get(Int8Ty, TCK_NonnullAssign)};
692 EmitCheck({{IsNotNull, SanitizerKind::NullabilityAssign}},
693 SanitizerHandler::TypeMismatch, StaticData, RHS);
696 void CodeGenFunction::EmitScalarInit(const Expr *init, const ValueDecl *D,
697 LValue lvalue, bool capturedByInit) {
698 Qualifiers::ObjCLifetime lifetime = lvalue.getObjCLifetime();
700 llvm::Value *value = EmitScalarExpr(init);
702 drillIntoBlockVariable(*this, lvalue, cast<VarDecl>(D));
703 EmitNullabilityCheck(lvalue, value, init->getExprLoc());
704 EmitStoreThroughLValue(RValue::get(value), lvalue, true);
708 if (const CXXDefaultInitExpr *DIE = dyn_cast<CXXDefaultInitExpr>(init))
709 init = DIE->getExpr();
711 // If we're emitting a value with lifetime, we have to do the
712 // initialization *before* we leave the cleanup scopes.
713 if (const ExprWithCleanups *ewc = dyn_cast<ExprWithCleanups>(init)) {
714 enterFullExpression(ewc);
715 init = ewc->getSubExpr();
717 CodeGenFunction::RunCleanupsScope Scope(*this);
719 // We have to maintain the illusion that the variable is
720 // zero-initialized. If the variable might be accessed in its
721 // initializer, zero-initialize before running the initializer, then
722 // actually perform the initialization with an assign.
723 bool accessedByInit = false;
724 if (lifetime != Qualifiers::OCL_ExplicitNone)
725 accessedByInit = (capturedByInit || isAccessedBy(D, init));
726 if (accessedByInit) {
727 LValue tempLV = lvalue;
728 // Drill down to the __block object if necessary.
729 if (capturedByInit) {
730 // We can use a simple GEP for this because it can't have been
732 tempLV.setAddress(emitBlockByrefAddress(tempLV.getAddress(),
737 auto ty = cast<llvm::PointerType>(tempLV.getAddress().getElementType());
738 llvm::Value *zero = CGM.getNullPointer(ty, tempLV.getType());
740 // If __weak, we want to use a barrier under certain conditions.
741 if (lifetime == Qualifiers::OCL_Weak)
742 EmitARCInitWeak(tempLV.getAddress(), zero);
744 // Otherwise just do a simple store.
746 EmitStoreOfScalar(zero, tempLV, /* isInitialization */ true);
749 // Emit the initializer.
750 llvm::Value *value = nullptr;
753 case Qualifiers::OCL_None:
754 llvm_unreachable("present but none");
756 case Qualifiers::OCL_ExplicitNone:
757 value = EmitARCUnsafeUnretainedScalarExpr(init);
760 case Qualifiers::OCL_Strong: {
761 value = EmitARCRetainScalarExpr(init);
765 case Qualifiers::OCL_Weak: {
766 // If it's not accessed by the initializer, try to emit the
767 // initialization with a copy or move.
768 if (!accessedByInit && tryEmitARCCopyWeakInit(*this, lvalue, init)) {
772 // No way to optimize a producing initializer into this. It's not
773 // worth optimizing for, because the value will immediately
774 // disappear in the common case.
775 value = EmitScalarExpr(init);
777 if (capturedByInit) drillIntoBlockVariable(*this, lvalue, cast<VarDecl>(D));
779 EmitARCStoreWeak(lvalue.getAddress(), value, /*ignored*/ true);
781 EmitARCInitWeak(lvalue.getAddress(), value);
785 case Qualifiers::OCL_Autoreleasing:
786 value = EmitARCRetainAutoreleaseScalarExpr(init);
790 if (capturedByInit) drillIntoBlockVariable(*this, lvalue, cast<VarDecl>(D));
792 EmitNullabilityCheck(lvalue, value, init->getExprLoc());
794 // If the variable might have been accessed by its initializer, we
795 // might have to initialize with a barrier. We have to do this for
796 // both __weak and __strong, but __weak got filtered out above.
797 if (accessedByInit && lifetime == Qualifiers::OCL_Strong) {
798 llvm::Value *oldValue = EmitLoadOfScalar(lvalue, init->getExprLoc());
799 EmitStoreOfScalar(value, lvalue, /* isInitialization */ true);
800 EmitARCRelease(oldValue, ARCImpreciseLifetime);
804 EmitStoreOfScalar(value, lvalue, /* isInitialization */ true);
807 /// canEmitInitWithFewStoresAfterMemset - Decide whether we can emit the
808 /// non-zero parts of the specified initializer with equal or fewer than
809 /// NumStores scalar stores.
810 static bool canEmitInitWithFewStoresAfterMemset(llvm::Constant *Init,
811 unsigned &NumStores) {
812 // Zero and Undef never requires any extra stores.
813 if (isa<llvm::ConstantAggregateZero>(Init) ||
814 isa<llvm::ConstantPointerNull>(Init) ||
815 isa<llvm::UndefValue>(Init))
817 if (isa<llvm::ConstantInt>(Init) || isa<llvm::ConstantFP>(Init) ||
818 isa<llvm::ConstantVector>(Init) || isa<llvm::BlockAddress>(Init) ||
819 isa<llvm::ConstantExpr>(Init))
820 return Init->isNullValue() || NumStores--;
822 // See if we can emit each element.
823 if (isa<llvm::ConstantArray>(Init) || isa<llvm::ConstantStruct>(Init)) {
824 for (unsigned i = 0, e = Init->getNumOperands(); i != e; ++i) {
825 llvm::Constant *Elt = cast<llvm::Constant>(Init->getOperand(i));
826 if (!canEmitInitWithFewStoresAfterMemset(Elt, NumStores))
832 if (llvm::ConstantDataSequential *CDS =
833 dyn_cast<llvm::ConstantDataSequential>(Init)) {
834 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
835 llvm::Constant *Elt = CDS->getElementAsConstant(i);
836 if (!canEmitInitWithFewStoresAfterMemset(Elt, NumStores))
842 // Anything else is hard and scary.
846 /// emitStoresForInitAfterMemset - For inits that
847 /// canEmitInitWithFewStoresAfterMemset returned true for, emit the scalar
848 /// stores that would be required.
849 static void emitStoresForInitAfterMemset(llvm::Constant *Init, llvm::Value *Loc,
850 bool isVolatile, CGBuilderTy &Builder) {
851 assert(!Init->isNullValue() && !isa<llvm::UndefValue>(Init) &&
852 "called emitStoresForInitAfterMemset for zero or undef value.");
854 if (isa<llvm::ConstantInt>(Init) || isa<llvm::ConstantFP>(Init) ||
855 isa<llvm::ConstantVector>(Init) || isa<llvm::BlockAddress>(Init) ||
856 isa<llvm::ConstantExpr>(Init)) {
857 Builder.CreateDefaultAlignedStore(Init, Loc, isVolatile);
861 if (llvm::ConstantDataSequential *CDS =
862 dyn_cast<llvm::ConstantDataSequential>(Init)) {
863 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
864 llvm::Constant *Elt = CDS->getElementAsConstant(i);
866 // If necessary, get a pointer to the element and emit it.
867 if (!Elt->isNullValue() && !isa<llvm::UndefValue>(Elt))
868 emitStoresForInitAfterMemset(
869 Elt, Builder.CreateConstGEP2_32(Init->getType(), Loc, 0, i),
870 isVolatile, Builder);
875 assert((isa<llvm::ConstantStruct>(Init) || isa<llvm::ConstantArray>(Init)) &&
876 "Unknown value type!");
878 for (unsigned i = 0, e = Init->getNumOperands(); i != e; ++i) {
879 llvm::Constant *Elt = cast<llvm::Constant>(Init->getOperand(i));
881 // If necessary, get a pointer to the element and emit it.
882 if (!Elt->isNullValue() && !isa<llvm::UndefValue>(Elt))
883 emitStoresForInitAfterMemset(
884 Elt, Builder.CreateConstGEP2_32(Init->getType(), Loc, 0, i),
885 isVolatile, Builder);
889 /// shouldUseMemSetPlusStoresToInitialize - Decide whether we should use memset
890 /// plus some stores to initialize a local variable instead of using a memcpy
891 /// from a constant global. It is beneficial to use memset if the global is all
892 /// zeros, or mostly zeros and large.
893 static bool shouldUseMemSetPlusStoresToInitialize(llvm::Constant *Init,
894 uint64_t GlobalSize) {
895 // If a global is all zeros, always use a memset.
896 if (isa<llvm::ConstantAggregateZero>(Init)) return true;
898 // If a non-zero global is <= 32 bytes, always use a memcpy. If it is large,
899 // do it if it will require 6 or fewer scalar stores.
900 // TODO: Should budget depends on the size? Avoiding a large global warrants
901 // plopping in more stores.
902 unsigned StoreBudget = 6;
903 uint64_t SizeLimit = 32;
905 return GlobalSize > SizeLimit &&
906 canEmitInitWithFewStoresAfterMemset(Init, StoreBudget);
909 /// EmitAutoVarDecl - Emit code and set up an entry in LocalDeclMap for a
910 /// variable declaration with auto, register, or no storage class specifier.
911 /// These turn into simple stack objects, or GlobalValues depending on target.
912 void CodeGenFunction::EmitAutoVarDecl(const VarDecl &D) {
913 AutoVarEmission emission = EmitAutoVarAlloca(D);
914 EmitAutoVarInit(emission);
915 EmitAutoVarCleanups(emission);
918 /// Emit a lifetime.begin marker if some criteria are satisfied.
919 /// \return a pointer to the temporary size Value if a marker was emitted, null
921 llvm::Value *CodeGenFunction::EmitLifetimeStart(uint64_t Size,
923 if (!ShouldEmitLifetimeMarkers)
926 llvm::Value *SizeV = llvm::ConstantInt::get(Int64Ty, Size);
927 Addr = Builder.CreateBitCast(Addr, AllocaInt8PtrTy);
929 Builder.CreateCall(CGM.getLLVMLifetimeStartFn(), {SizeV, Addr});
930 C->setDoesNotThrow();
934 void CodeGenFunction::EmitLifetimeEnd(llvm::Value *Size, llvm::Value *Addr) {
935 Addr = Builder.CreateBitCast(Addr, AllocaInt8PtrTy);
937 Builder.CreateCall(CGM.getLLVMLifetimeEndFn(), {Size, Addr});
938 C->setDoesNotThrow();
941 /// EmitAutoVarAlloca - Emit the alloca and debug information for a
942 /// local variable. Does not emit initialization or destruction.
943 CodeGenFunction::AutoVarEmission
944 CodeGenFunction::EmitAutoVarAlloca(const VarDecl &D) {
945 QualType Ty = D.getType();
947 AutoVarEmission emission(D);
949 bool isByRef = D.hasAttr<BlocksAttr>();
950 emission.IsByRef = isByRef;
952 CharUnits alignment = getContext().getDeclAlign(&D);
954 // If the type is variably-modified, emit all the VLA sizes for it.
955 if (Ty->isVariablyModifiedType())
956 EmitVariablyModifiedType(Ty);
958 Address address = Address::invalid();
959 if (Ty->isConstantSizeType()) {
960 bool NRVO = getLangOpts().ElideConstructors &&
963 // If this value is an array or struct with a statically determinable
964 // constant initializer, there are optimizations we can do.
966 // TODO: We should constant-evaluate the initializer of any variable,
967 // as long as it is initialized by a constant expression. Currently,
968 // isConstantInitializer produces wrong answers for structs with
969 // reference or bitfield members, and a few other cases, and checking
970 // for POD-ness protects us from some of these.
971 if (D.getInit() && (Ty->isArrayType() || Ty->isRecordType()) &&
973 ((Ty.isPODType(getContext()) ||
974 getContext().getBaseElementType(Ty)->isObjCObjectPointerType()) &&
975 D.getInit()->isConstantInitializer(getContext(), false)))) {
977 // If the variable's a const type, and it's neither an NRVO
978 // candidate nor a __block variable and has no mutable members,
979 // emit it as a global instead.
980 // Exception is if a variable is located in non-constant address space
982 if ((!getLangOpts().OpenCL ||
983 Ty.getAddressSpace() == LangAS::opencl_constant) &&
984 (CGM.getCodeGenOpts().MergeAllConstants && !NRVO && !isByRef &&
985 CGM.isTypeConstant(Ty, true))) {
986 EmitStaticVarDecl(D, llvm::GlobalValue::InternalLinkage);
988 // Signal this condition to later callbacks.
989 emission.Addr = Address::invalid();
990 assert(emission.wasEmittedAsGlobal());
994 // Otherwise, tell the initialization code that we're in this case.
995 emission.IsConstantAggregate = true;
998 // A normal fixed sized variable becomes an alloca in the entry block,
999 // unless it's an NRVO variable.
1002 // The named return value optimization: allocate this variable in the
1003 // return slot, so that we can elide the copy when returning this
1004 // variable (C++0x [class.copy]p34).
1005 address = ReturnValue;
1007 if (const RecordType *RecordTy = Ty->getAs<RecordType>()) {
1008 if (!cast<CXXRecordDecl>(RecordTy->getDecl())->hasTrivialDestructor()) {
1009 // Create a flag that is used to indicate when the NRVO was applied
1010 // to this variable. Set it to zero to indicate that NRVO was not
1012 llvm::Value *Zero = Builder.getFalse();
1014 CreateTempAlloca(Zero->getType(), CharUnits::One(), "nrvo");
1015 EnsureInsertPoint();
1016 Builder.CreateStore(Zero, NRVOFlag);
1018 // Record the NRVO flag for this variable.
1019 NRVOFlags[&D] = NRVOFlag.getPointer();
1020 emission.NRVOFlag = NRVOFlag.getPointer();
1024 CharUnits allocaAlignment;
1025 llvm::Type *allocaTy;
1027 auto &byrefInfo = getBlockByrefInfo(&D);
1028 allocaTy = byrefInfo.Type;
1029 allocaAlignment = byrefInfo.ByrefAlignment;
1031 allocaTy = ConvertTypeForMem(Ty);
1032 allocaAlignment = alignment;
1035 // Create the alloca. Note that we set the name separately from
1036 // building the instruction so that it's there even in no-asserts
1038 address = CreateTempAlloca(allocaTy, allocaAlignment);
1039 address.getPointer()->setName(D.getName());
1041 // Don't emit lifetime markers for MSVC catch parameters. The lifetime of
1042 // the catch parameter starts in the catchpad instruction, and we can't
1043 // insert code in those basic blocks.
1044 bool IsMSCatchParam =
1045 D.isExceptionVariable() && getTarget().getCXXABI().isMicrosoft();
1047 // Emit a lifetime intrinsic if meaningful. There's no point in doing this
1048 // if we don't have a valid insertion point (?).
1049 if (HaveInsertPoint() && !IsMSCatchParam) {
1050 // If there's a jump into the lifetime of this variable, its lifetime
1051 // gets broken up into several regions in IR, which requires more work
1052 // to handle correctly. For now, just omit the intrinsics; this is a
1053 // rare case, and it's better to just be conservatively correct.
1056 // We have to do this in all language modes if there's a jump past the
1057 // declaration. We also have to do it in C if there's a jump to an
1058 // earlier point in the current block because non-VLA lifetimes begin as
1059 // soon as the containing block is entered, not when its variables
1060 // actually come into scope; suppressing the lifetime annotations
1061 // completely in this case is unnecessarily pessimistic, but again, this
1063 if (!Bypasses.IsBypassed(&D) &&
1064 !(!getLangOpts().CPlusPlus && hasLabelBeenSeenInCurrentScope())) {
1065 uint64_t size = CGM.getDataLayout().getTypeAllocSize(allocaTy);
1066 emission.SizeForLifetimeMarkers =
1067 EmitLifetimeStart(size, address.getPointer());
1070 assert(!emission.useLifetimeMarkers());
1074 EnsureInsertPoint();
1076 if (!DidCallStackSave) {
1079 CreateTempAlloca(Int8PtrTy, getPointerAlign(), "saved_stack");
1081 llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::stacksave);
1082 llvm::Value *V = Builder.CreateCall(F);
1083 Builder.CreateStore(V, Stack);
1085 DidCallStackSave = true;
1087 // Push a cleanup block and restore the stack there.
1088 // FIXME: in general circumstances, this should be an EH cleanup.
1089 pushStackRestore(NormalCleanup, Stack);
1092 llvm::Value *elementCount;
1093 QualType elementType;
1094 std::tie(elementCount, elementType) = getVLASize(Ty);
1096 llvm::Type *llvmTy = ConvertTypeForMem(elementType);
1098 // Allocate memory for the array.
1099 llvm::AllocaInst *vla = Builder.CreateAlloca(llvmTy, elementCount, "vla");
1100 vla->setAlignment(alignment.getQuantity());
1102 address = Address(vla, alignment);
1105 setAddrOfLocalVar(&D, address);
1106 emission.Addr = address;
1108 // Emit debug info for local var declaration.
1109 if (HaveInsertPoint())
1110 if (CGDebugInfo *DI = getDebugInfo()) {
1111 if (CGM.getCodeGenOpts().getDebugInfo() >=
1112 codegenoptions::LimitedDebugInfo) {
1113 DI->setLocation(D.getLocation());
1114 DI->EmitDeclareOfAutoVariable(&D, address.getPointer(), Builder);
1118 if (D.hasAttr<AnnotateAttr>())
1119 EmitVarAnnotations(&D, address.getPointer());
1121 // Make sure we call @llvm.lifetime.end.
1122 if (emission.useLifetimeMarkers())
1123 EHStack.pushCleanup<CallLifetimeEnd>(NormalEHLifetimeMarker,
1124 emission.getAllocatedAddress(),
1125 emission.getSizeForLifetimeMarkers());
1130 /// Determines whether the given __block variable is potentially
1131 /// captured by the given expression.
1132 static bool isCapturedBy(const VarDecl &var, const Expr *e) {
1133 // Skip the most common kinds of expressions that make
1134 // hierarchy-walking expensive.
1135 e = e->IgnoreParenCasts();
1137 if (const BlockExpr *be = dyn_cast<BlockExpr>(e)) {
1138 const BlockDecl *block = be->getBlockDecl();
1139 for (const auto &I : block->captures()) {
1140 if (I.getVariable() == &var)
1144 // No need to walk into the subexpressions.
1148 if (const StmtExpr *SE = dyn_cast<StmtExpr>(e)) {
1149 const CompoundStmt *CS = SE->getSubStmt();
1150 for (const auto *BI : CS->body())
1151 if (const auto *E = dyn_cast<Expr>(BI)) {
1152 if (isCapturedBy(var, E))
1155 else if (const auto *DS = dyn_cast<DeclStmt>(BI)) {
1156 // special case declarations
1157 for (const auto *I : DS->decls()) {
1158 if (const auto *VD = dyn_cast<VarDecl>((I))) {
1159 const Expr *Init = VD->getInit();
1160 if (Init && isCapturedBy(var, Init))
1166 // FIXME. Make safe assumption assuming arbitrary statements cause capturing.
1167 // Later, provide code to poke into statements for capture analysis.
1172 for (const Stmt *SubStmt : e->children())
1173 if (isCapturedBy(var, cast<Expr>(SubStmt)))
1179 /// \brief Determine whether the given initializer is trivial in the sense
1180 /// that it requires no code to be generated.
1181 bool CodeGenFunction::isTrivialInitializer(const Expr *Init) {
1185 if (const CXXConstructExpr *Construct = dyn_cast<CXXConstructExpr>(Init))
1186 if (CXXConstructorDecl *Constructor = Construct->getConstructor())
1187 if (Constructor->isTrivial() &&
1188 Constructor->isDefaultConstructor() &&
1189 !Construct->requiresZeroInitialization())
1195 void CodeGenFunction::EmitAutoVarInit(const AutoVarEmission &emission) {
1196 assert(emission.Variable && "emission was not valid!");
1198 // If this was emitted as a global constant, we're done.
1199 if (emission.wasEmittedAsGlobal()) return;
1201 const VarDecl &D = *emission.Variable;
1202 auto DL = ApplyDebugLocation::CreateDefaultArtificial(*this, D.getLocation());
1203 QualType type = D.getType();
1205 // If this local has an initializer, emit it now.
1206 const Expr *Init = D.getInit();
1208 // If we are at an unreachable point, we don't need to emit the initializer
1209 // unless it contains a label.
1210 if (!HaveInsertPoint()) {
1211 if (!Init || !ContainsLabel(Init)) return;
1212 EnsureInsertPoint();
1215 // Initialize the structure of a __block variable.
1216 if (emission.IsByRef)
1217 emitByrefStructureInit(emission);
1219 if (isTrivialInitializer(Init))
1222 // Check whether this is a byref variable that's potentially
1223 // captured and moved by its own initializer. If so, we'll need to
1224 // emit the initializer first, then copy into the variable.
1225 bool capturedByInit = emission.IsByRef && isCapturedBy(D, Init);
1228 capturedByInit ? emission.Addr : emission.getObjectAddress(*this);
1230 llvm::Constant *constant = nullptr;
1231 if (emission.IsConstantAggregate || D.isConstexpr()) {
1232 assert(!capturedByInit && "constant init contains a capturing block?");
1233 constant = CGM.EmitConstantInit(D, this);
1237 LValue lv = MakeAddrLValue(Loc, type);
1239 return EmitExprAsInit(Init, &D, lv, capturedByInit);
1242 if (!emission.IsConstantAggregate) {
1243 // For simple scalar/complex initialization, store the value directly.
1244 LValue lv = MakeAddrLValue(Loc, type);
1246 return EmitStoreThroughLValue(RValue::get(constant), lv, true);
1249 // If this is a simple aggregate initialization, we can optimize it
1251 bool isVolatile = type.isVolatileQualified();
1253 llvm::Value *SizeVal =
1254 llvm::ConstantInt::get(IntPtrTy,
1255 getContext().getTypeSizeInChars(type).getQuantity());
1257 llvm::Type *BP = Int8PtrTy;
1258 if (Loc.getType() != BP)
1259 Loc = Builder.CreateBitCast(Loc, BP);
1261 // If the initializer is all or mostly zeros, codegen with memset then do
1262 // a few stores afterward.
1263 if (shouldUseMemSetPlusStoresToInitialize(constant,
1264 CGM.getDataLayout().getTypeAllocSize(constant->getType()))) {
1265 Builder.CreateMemSet(Loc, llvm::ConstantInt::get(Int8Ty, 0), SizeVal,
1267 // Zero and undef don't require a stores.
1268 if (!constant->isNullValue() && !isa<llvm::UndefValue>(constant)) {
1269 Loc = Builder.CreateBitCast(Loc, constant->getType()->getPointerTo());
1270 emitStoresForInitAfterMemset(constant, Loc.getPointer(),
1271 isVolatile, Builder);
1274 // Otherwise, create a temporary global with the initializer then
1275 // memcpy from the global to the alloca.
1276 std::string Name = getStaticDeclName(CGM, D);
1278 if (getLangOpts().OpenCL) {
1279 AS = CGM.getContext().getTargetAddressSpace(LangAS::opencl_constant);
1280 BP = llvm::PointerType::getInt8PtrTy(getLLVMContext(), AS);
1282 llvm::GlobalVariable *GV =
1283 new llvm::GlobalVariable(CGM.getModule(), constant->getType(), true,
1284 llvm::GlobalValue::PrivateLinkage,
1285 constant, Name, nullptr,
1286 llvm::GlobalValue::NotThreadLocal, AS);
1287 GV->setAlignment(Loc.getAlignment().getQuantity());
1288 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1290 Address SrcPtr = Address(GV, Loc.getAlignment());
1291 if (SrcPtr.getType() != BP)
1292 SrcPtr = Builder.CreateBitCast(SrcPtr, BP);
1294 Builder.CreateMemCpy(Loc, SrcPtr, SizeVal, isVolatile);
1298 /// Emit an expression as an initializer for a variable at the given
1299 /// location. The expression is not necessarily the normal
1300 /// initializer for the variable, and the address is not necessarily
1301 /// its normal location.
1303 /// \param init the initializing expression
1304 /// \param var the variable to act as if we're initializing
1305 /// \param loc the address to initialize; its type is a pointer
1306 /// to the LLVM mapping of the variable's type
1307 /// \param alignment the alignment of the address
1308 /// \param capturedByInit true if the variable is a __block variable
1309 /// whose address is potentially changed by the initializer
1310 void CodeGenFunction::EmitExprAsInit(const Expr *init, const ValueDecl *D,
1311 LValue lvalue, bool capturedByInit) {
1312 QualType type = D->getType();
1314 if (type->isReferenceType()) {
1315 RValue rvalue = EmitReferenceBindingToExpr(init);
1317 drillIntoBlockVariable(*this, lvalue, cast<VarDecl>(D));
1318 EmitStoreThroughLValue(rvalue, lvalue, true);
1321 switch (getEvaluationKind(type)) {
1323 EmitScalarInit(init, D, lvalue, capturedByInit);
1326 ComplexPairTy complex = EmitComplexExpr(init);
1328 drillIntoBlockVariable(*this, lvalue, cast<VarDecl>(D));
1329 EmitStoreOfComplex(complex, lvalue, /*init*/ true);
1333 if (type->isAtomicType()) {
1334 EmitAtomicInit(const_cast<Expr*>(init), lvalue);
1336 // TODO: how can we delay here if D is captured by its initializer?
1337 EmitAggExpr(init, AggValueSlot::forLValue(lvalue,
1338 AggValueSlot::IsDestructed,
1339 AggValueSlot::DoesNotNeedGCBarriers,
1340 AggValueSlot::IsNotAliased));
1344 llvm_unreachable("bad evaluation kind");
1347 /// Enter a destroy cleanup for the given local variable.
1348 void CodeGenFunction::emitAutoVarTypeCleanup(
1349 const CodeGenFunction::AutoVarEmission &emission,
1350 QualType::DestructionKind dtorKind) {
1351 assert(dtorKind != QualType::DK_none);
1353 // Note that for __block variables, we want to destroy the
1354 // original stack object, not the possibly forwarded object.
1355 Address addr = emission.getObjectAddress(*this);
1357 const VarDecl *var = emission.Variable;
1358 QualType type = var->getType();
1360 CleanupKind cleanupKind = NormalAndEHCleanup;
1361 CodeGenFunction::Destroyer *destroyer = nullptr;
1364 case QualType::DK_none:
1365 llvm_unreachable("no cleanup for trivially-destructible variable");
1367 case QualType::DK_cxx_destructor:
1368 // If there's an NRVO flag on the emission, we need a different
1370 if (emission.NRVOFlag) {
1371 assert(!type->isArrayType());
1372 CXXDestructorDecl *dtor = type->getAsCXXRecordDecl()->getDestructor();
1373 EHStack.pushCleanup<DestroyNRVOVariable>(cleanupKind, addr,
1374 dtor, emission.NRVOFlag);
1379 case QualType::DK_objc_strong_lifetime:
1380 // Suppress cleanups for pseudo-strong variables.
1381 if (var->isARCPseudoStrong()) return;
1383 // Otherwise, consider whether to use an EH cleanup or not.
1384 cleanupKind = getARCCleanupKind();
1386 // Use the imprecise destroyer by default.
1387 if (!var->hasAttr<ObjCPreciseLifetimeAttr>())
1388 destroyer = CodeGenFunction::destroyARCStrongImprecise;
1391 case QualType::DK_objc_weak_lifetime:
1395 // If we haven't chosen a more specific destroyer, use the default.
1396 if (!destroyer) destroyer = getDestroyer(dtorKind);
1398 // Use an EH cleanup in array destructors iff the destructor itself
1399 // is being pushed as an EH cleanup.
1400 bool useEHCleanup = (cleanupKind & EHCleanup);
1401 EHStack.pushCleanup<DestroyObject>(cleanupKind, addr, type, destroyer,
1405 void CodeGenFunction::EmitAutoVarCleanups(const AutoVarEmission &emission) {
1406 assert(emission.Variable && "emission was not valid!");
1408 // If this was emitted as a global constant, we're done.
1409 if (emission.wasEmittedAsGlobal()) return;
1411 // If we don't have an insertion point, we're done. Sema prevents
1412 // us from jumping into any of these scopes anyway.
1413 if (!HaveInsertPoint()) return;
1415 const VarDecl &D = *emission.Variable;
1417 // Check the type for a cleanup.
1418 if (QualType::DestructionKind dtorKind = D.getType().isDestructedType())
1419 emitAutoVarTypeCleanup(emission, dtorKind);
1421 // In GC mode, honor objc_precise_lifetime.
1422 if (getLangOpts().getGC() != LangOptions::NonGC &&
1423 D.hasAttr<ObjCPreciseLifetimeAttr>()) {
1424 EHStack.pushCleanup<ExtendGCLifetime>(NormalCleanup, &D);
1427 // Handle the cleanup attribute.
1428 if (const CleanupAttr *CA = D.getAttr<CleanupAttr>()) {
1429 const FunctionDecl *FD = CA->getFunctionDecl();
1431 llvm::Constant *F = CGM.GetAddrOfFunction(FD);
1432 assert(F && "Could not find function!");
1434 const CGFunctionInfo &Info = CGM.getTypes().arrangeFunctionDeclaration(FD);
1435 EHStack.pushCleanup<CallCleanupFunction>(NormalAndEHCleanup, F, &Info, &D);
1438 // If this is a block variable, call _Block_object_destroy
1439 // (on the unforwarded address).
1440 if (emission.IsByRef)
1441 enterByrefCleanup(emission);
1444 CodeGenFunction::Destroyer *
1445 CodeGenFunction::getDestroyer(QualType::DestructionKind kind) {
1447 case QualType::DK_none: llvm_unreachable("no destroyer for trivial dtor");
1448 case QualType::DK_cxx_destructor:
1449 return destroyCXXObject;
1450 case QualType::DK_objc_strong_lifetime:
1451 return destroyARCStrongPrecise;
1452 case QualType::DK_objc_weak_lifetime:
1453 return destroyARCWeak;
1455 llvm_unreachable("Unknown DestructionKind");
1458 /// pushEHDestroy - Push the standard destructor for the given type as
1459 /// an EH-only cleanup.
1460 void CodeGenFunction::pushEHDestroy(QualType::DestructionKind dtorKind,
1461 Address addr, QualType type) {
1462 assert(dtorKind && "cannot push destructor for trivial type");
1463 assert(needsEHCleanup(dtorKind));
1465 pushDestroy(EHCleanup, addr, type, getDestroyer(dtorKind), true);
1468 /// pushDestroy - Push the standard destructor for the given type as
1469 /// at least a normal cleanup.
1470 void CodeGenFunction::pushDestroy(QualType::DestructionKind dtorKind,
1471 Address addr, QualType type) {
1472 assert(dtorKind && "cannot push destructor for trivial type");
1474 CleanupKind cleanupKind = getCleanupKind(dtorKind);
1475 pushDestroy(cleanupKind, addr, type, getDestroyer(dtorKind),
1476 cleanupKind & EHCleanup);
1479 void CodeGenFunction::pushDestroy(CleanupKind cleanupKind, Address addr,
1480 QualType type, Destroyer *destroyer,
1481 bool useEHCleanupForArray) {
1482 pushFullExprCleanup<DestroyObject>(cleanupKind, addr, type,
1483 destroyer, useEHCleanupForArray);
1486 void CodeGenFunction::pushStackRestore(CleanupKind Kind, Address SPMem) {
1487 EHStack.pushCleanup<CallStackRestore>(Kind, SPMem);
1490 void CodeGenFunction::pushLifetimeExtendedDestroy(
1491 CleanupKind cleanupKind, Address addr, QualType type,
1492 Destroyer *destroyer, bool useEHCleanupForArray) {
1493 assert(!isInConditionalBranch() &&
1494 "performing lifetime extension from within conditional");
1496 // Push an EH-only cleanup for the object now.
1497 // FIXME: When popping normal cleanups, we need to keep this EH cleanup
1498 // around in case a temporary's destructor throws an exception.
1499 if (cleanupKind & EHCleanup)
1500 EHStack.pushCleanup<DestroyObject>(
1501 static_cast<CleanupKind>(cleanupKind & ~NormalCleanup), addr, type,
1502 destroyer, useEHCleanupForArray);
1504 // Remember that we need to push a full cleanup for the object at the
1505 // end of the full-expression.
1506 pushCleanupAfterFullExpr<DestroyObject>(
1507 cleanupKind, addr, type, destroyer, useEHCleanupForArray);
1510 /// emitDestroy - Immediately perform the destruction of the given
1513 /// \param addr - the address of the object; a type*
1514 /// \param type - the type of the object; if an array type, all
1515 /// objects are destroyed in reverse order
1516 /// \param destroyer - the function to call to destroy individual
1518 /// \param useEHCleanupForArray - whether an EH cleanup should be
1519 /// used when destroying array elements, in case one of the
1520 /// destructions throws an exception
1521 void CodeGenFunction::emitDestroy(Address addr, QualType type,
1522 Destroyer *destroyer,
1523 bool useEHCleanupForArray) {
1524 const ArrayType *arrayType = getContext().getAsArrayType(type);
1526 return destroyer(*this, addr, type);
1528 llvm::Value *length = emitArrayLength(arrayType, type, addr);
1530 CharUnits elementAlign =
1532 .alignmentOfArrayElement(getContext().getTypeSizeInChars(type));
1534 // Normally we have to check whether the array is zero-length.
1535 bool checkZeroLength = true;
1537 // But if the array length is constant, we can suppress that.
1538 if (llvm::ConstantInt *constLength = dyn_cast<llvm::ConstantInt>(length)) {
1539 // ...and if it's constant zero, we can just skip the entire thing.
1540 if (constLength->isZero()) return;
1541 checkZeroLength = false;
1544 llvm::Value *begin = addr.getPointer();
1545 llvm::Value *end = Builder.CreateInBoundsGEP(begin, length);
1546 emitArrayDestroy(begin, end, type, elementAlign, destroyer,
1547 checkZeroLength, useEHCleanupForArray);
1550 /// emitArrayDestroy - Destroys all the elements of the given array,
1551 /// beginning from last to first. The array cannot be zero-length.
1553 /// \param begin - a type* denoting the first element of the array
1554 /// \param end - a type* denoting one past the end of the array
1555 /// \param elementType - the element type of the array
1556 /// \param destroyer - the function to call to destroy elements
1557 /// \param useEHCleanup - whether to push an EH cleanup to destroy
1558 /// the remaining elements in case the destruction of a single
1560 void CodeGenFunction::emitArrayDestroy(llvm::Value *begin,
1562 QualType elementType,
1563 CharUnits elementAlign,
1564 Destroyer *destroyer,
1565 bool checkZeroLength,
1566 bool useEHCleanup) {
1567 assert(!elementType->isArrayType());
1569 // The basic structure here is a do-while loop, because we don't
1570 // need to check for the zero-element case.
1571 llvm::BasicBlock *bodyBB = createBasicBlock("arraydestroy.body");
1572 llvm::BasicBlock *doneBB = createBasicBlock("arraydestroy.done");
1574 if (checkZeroLength) {
1575 llvm::Value *isEmpty = Builder.CreateICmpEQ(begin, end,
1576 "arraydestroy.isempty");
1577 Builder.CreateCondBr(isEmpty, doneBB, bodyBB);
1580 // Enter the loop body, making that address the current address.
1581 llvm::BasicBlock *entryBB = Builder.GetInsertBlock();
1583 llvm::PHINode *elementPast =
1584 Builder.CreatePHI(begin->getType(), 2, "arraydestroy.elementPast");
1585 elementPast->addIncoming(end, entryBB);
1587 // Shift the address back by one element.
1588 llvm::Value *negativeOne = llvm::ConstantInt::get(SizeTy, -1, true);
1589 llvm::Value *element = Builder.CreateInBoundsGEP(elementPast, negativeOne,
1590 "arraydestroy.element");
1593 pushRegularPartialArrayCleanup(begin, element, elementType, elementAlign,
1596 // Perform the actual destruction there.
1597 destroyer(*this, Address(element, elementAlign), elementType);
1602 // Check whether we've reached the end.
1603 llvm::Value *done = Builder.CreateICmpEQ(element, begin, "arraydestroy.done");
1604 Builder.CreateCondBr(done, doneBB, bodyBB);
1605 elementPast->addIncoming(element, Builder.GetInsertBlock());
1611 /// Perform partial array destruction as if in an EH cleanup. Unlike
1612 /// emitArrayDestroy, the element type here may still be an array type.
1613 static void emitPartialArrayDestroy(CodeGenFunction &CGF,
1614 llvm::Value *begin, llvm::Value *end,
1615 QualType type, CharUnits elementAlign,
1616 CodeGenFunction::Destroyer *destroyer) {
1617 // If the element type is itself an array, drill down.
1618 unsigned arrayDepth = 0;
1619 while (const ArrayType *arrayType = CGF.getContext().getAsArrayType(type)) {
1620 // VLAs don't require a GEP index to walk into.
1621 if (!isa<VariableArrayType>(arrayType))
1623 type = arrayType->getElementType();
1627 llvm::Value *zero = llvm::ConstantInt::get(CGF.SizeTy, 0);
1629 SmallVector<llvm::Value*,4> gepIndices(arrayDepth+1, zero);
1630 begin = CGF.Builder.CreateInBoundsGEP(begin, gepIndices, "pad.arraybegin");
1631 end = CGF.Builder.CreateInBoundsGEP(end, gepIndices, "pad.arrayend");
1634 // Destroy the array. We don't ever need an EH cleanup because we
1635 // assume that we're in an EH cleanup ourselves, so a throwing
1636 // destructor causes an immediate terminate.
1637 CGF.emitArrayDestroy(begin, end, type, elementAlign, destroyer,
1638 /*checkZeroLength*/ true, /*useEHCleanup*/ false);
1642 /// RegularPartialArrayDestroy - a cleanup which performs a partial
1643 /// array destroy where the end pointer is regularly determined and
1644 /// does not need to be loaded from a local.
1645 class RegularPartialArrayDestroy final : public EHScopeStack::Cleanup {
1646 llvm::Value *ArrayBegin;
1647 llvm::Value *ArrayEnd;
1648 QualType ElementType;
1649 CodeGenFunction::Destroyer *Destroyer;
1650 CharUnits ElementAlign;
1652 RegularPartialArrayDestroy(llvm::Value *arrayBegin, llvm::Value *arrayEnd,
1653 QualType elementType, CharUnits elementAlign,
1654 CodeGenFunction::Destroyer *destroyer)
1655 : ArrayBegin(arrayBegin), ArrayEnd(arrayEnd),
1656 ElementType(elementType), Destroyer(destroyer),
1657 ElementAlign(elementAlign) {}
1659 void Emit(CodeGenFunction &CGF, Flags flags) override {
1660 emitPartialArrayDestroy(CGF, ArrayBegin, ArrayEnd,
1661 ElementType, ElementAlign, Destroyer);
1665 /// IrregularPartialArrayDestroy - a cleanup which performs a
1666 /// partial array destroy where the end pointer is irregularly
1667 /// determined and must be loaded from a local.
1668 class IrregularPartialArrayDestroy final : public EHScopeStack::Cleanup {
1669 llvm::Value *ArrayBegin;
1670 Address ArrayEndPointer;
1671 QualType ElementType;
1672 CodeGenFunction::Destroyer *Destroyer;
1673 CharUnits ElementAlign;
1675 IrregularPartialArrayDestroy(llvm::Value *arrayBegin,
1676 Address arrayEndPointer,
1677 QualType elementType,
1678 CharUnits elementAlign,
1679 CodeGenFunction::Destroyer *destroyer)
1680 : ArrayBegin(arrayBegin), ArrayEndPointer(arrayEndPointer),
1681 ElementType(elementType), Destroyer(destroyer),
1682 ElementAlign(elementAlign) {}
1684 void Emit(CodeGenFunction &CGF, Flags flags) override {
1685 llvm::Value *arrayEnd = CGF.Builder.CreateLoad(ArrayEndPointer);
1686 emitPartialArrayDestroy(CGF, ArrayBegin, arrayEnd,
1687 ElementType, ElementAlign, Destroyer);
1690 } // end anonymous namespace
1692 /// pushIrregularPartialArrayCleanup - Push an EH cleanup to destroy
1693 /// already-constructed elements of the given array. The cleanup
1694 /// may be popped with DeactivateCleanupBlock or PopCleanupBlock.
1696 /// \param elementType - the immediate element type of the array;
1697 /// possibly still an array type
1698 void CodeGenFunction::pushIrregularPartialArrayCleanup(llvm::Value *arrayBegin,
1699 Address arrayEndPointer,
1700 QualType elementType,
1701 CharUnits elementAlign,
1702 Destroyer *destroyer) {
1703 pushFullExprCleanup<IrregularPartialArrayDestroy>(EHCleanup,
1704 arrayBegin, arrayEndPointer,
1705 elementType, elementAlign,
1709 /// pushRegularPartialArrayCleanup - Push an EH cleanup to destroy
1710 /// already-constructed elements of the given array. The cleanup
1711 /// may be popped with DeactivateCleanupBlock or PopCleanupBlock.
1713 /// \param elementType - the immediate element type of the array;
1714 /// possibly still an array type
1715 void CodeGenFunction::pushRegularPartialArrayCleanup(llvm::Value *arrayBegin,
1716 llvm::Value *arrayEnd,
1717 QualType elementType,
1718 CharUnits elementAlign,
1719 Destroyer *destroyer) {
1720 pushFullExprCleanup<RegularPartialArrayDestroy>(EHCleanup,
1721 arrayBegin, arrayEnd,
1722 elementType, elementAlign,
1726 /// Lazily declare the @llvm.lifetime.start intrinsic.
1727 llvm::Constant *CodeGenModule::getLLVMLifetimeStartFn() {
1728 if (LifetimeStartFn)
1729 return LifetimeStartFn;
1730 LifetimeStartFn = llvm::Intrinsic::getDeclaration(&getModule(),
1731 llvm::Intrinsic::lifetime_start, AllocaInt8PtrTy);
1732 return LifetimeStartFn;
1735 /// Lazily declare the @llvm.lifetime.end intrinsic.
1736 llvm::Constant *CodeGenModule::getLLVMLifetimeEndFn() {
1738 return LifetimeEndFn;
1739 LifetimeEndFn = llvm::Intrinsic::getDeclaration(&getModule(),
1740 llvm::Intrinsic::lifetime_end, AllocaInt8PtrTy);
1741 return LifetimeEndFn;
1745 /// A cleanup to perform a release of an object at the end of a
1746 /// function. This is used to balance out the incoming +1 of a
1747 /// ns_consumed argument when we can't reasonably do that just by
1748 /// not doing the initial retain for a __block argument.
1749 struct ConsumeARCParameter final : EHScopeStack::Cleanup {
1750 ConsumeARCParameter(llvm::Value *param,
1751 ARCPreciseLifetime_t precise)
1752 : Param(param), Precise(precise) {}
1755 ARCPreciseLifetime_t Precise;
1757 void Emit(CodeGenFunction &CGF, Flags flags) override {
1758 CGF.EmitARCRelease(Param, Precise);
1761 } // end anonymous namespace
1763 /// Emit an alloca (or GlobalValue depending on target)
1764 /// for the specified parameter and set up LocalDeclMap.
1765 void CodeGenFunction::EmitParmDecl(const VarDecl &D, ParamValue Arg,
1767 // FIXME: Why isn't ImplicitParamDecl a ParmVarDecl?
1768 assert((isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D)) &&
1769 "Invalid argument to EmitParmDecl");
1771 Arg.getAnyValue()->setName(D.getName());
1773 QualType Ty = D.getType();
1775 // Use better IR generation for certain implicit parameters.
1776 if (auto IPD = dyn_cast<ImplicitParamDecl>(&D)) {
1777 // The only implicit argument a block has is its literal.
1778 // We assume this is always passed directly.
1780 setBlockContextParameter(IPD, ArgNo, Arg.getDirectValue());
1784 // Apply any prologue 'this' adjustments required by the ABI. Be careful to
1785 // handle the case where 'this' is passed indirectly as part of an inalloca
1787 if (const CXXMethodDecl *MD =
1788 dyn_cast_or_null<CXXMethodDecl>(CurCodeDecl)) {
1789 if (MD->isVirtual() && IPD == CXXABIThisDecl) {
1790 llvm::Value *This = Arg.isIndirect()
1791 ? Builder.CreateLoad(Arg.getIndirectAddress())
1792 : Arg.getDirectValue();
1793 This = CGM.getCXXABI().adjustThisParameterInVirtualFunctionPrologue(
1794 *this, CurGD, This);
1795 if (Arg.isIndirect())
1796 Builder.CreateStore(This, Arg.getIndirectAddress());
1798 Arg = ParamValue::forDirect(This);
1803 Address DeclPtr = Address::invalid();
1804 bool DoStore = false;
1805 bool IsScalar = hasScalarEvaluationKind(Ty);
1806 // If we already have a pointer to the argument, reuse the input pointer.
1807 if (Arg.isIndirect()) {
1808 DeclPtr = Arg.getIndirectAddress();
1809 // If we have a prettier pointer type at this point, bitcast to that.
1810 unsigned AS = DeclPtr.getType()->getAddressSpace();
1811 llvm::Type *IRTy = ConvertTypeForMem(Ty)->getPointerTo(AS);
1812 if (DeclPtr.getType() != IRTy)
1813 DeclPtr = Builder.CreateBitCast(DeclPtr, IRTy, D.getName());
1815 // Push a destructor cleanup for this parameter if the ABI requires it.
1816 // Don't push a cleanup in a thunk for a method that will also emit a
1818 if (!IsScalar && !CurFuncIsThunk &&
1819 getTarget().getCXXABI().areArgsDestroyedLeftToRightInCallee()) {
1820 const CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
1821 if (RD && RD->hasNonTrivialDestructor())
1822 pushDestroy(QualType::DK_cxx_destructor, DeclPtr, Ty);
1825 // Otherwise, create a temporary to hold the value.
1826 DeclPtr = CreateMemTemp(Ty, getContext().getDeclAlign(&D),
1827 D.getName() + ".addr");
1831 llvm::Value *ArgVal = (DoStore ? Arg.getDirectValue() : nullptr);
1833 LValue lv = MakeAddrLValue(DeclPtr, Ty);
1835 Qualifiers qs = Ty.getQualifiers();
1836 if (Qualifiers::ObjCLifetime lt = qs.getObjCLifetime()) {
1837 // We honor __attribute__((ns_consumed)) for types with lifetime.
1838 // For __strong, it's handled by just skipping the initial retain;
1839 // otherwise we have to balance out the initial +1 with an extra
1840 // cleanup to do the release at the end of the function.
1841 bool isConsumed = D.hasAttr<NSConsumedAttr>();
1843 // 'self' is always formally __strong, but if this is not an
1844 // init method then we don't want to retain it.
1845 if (D.isARCPseudoStrong()) {
1846 const ObjCMethodDecl *method = cast<ObjCMethodDecl>(CurCodeDecl);
1847 assert(&D == method->getSelfDecl());
1848 assert(lt == Qualifiers::OCL_Strong);
1849 assert(qs.hasConst());
1850 assert(method->getMethodFamily() != OMF_init);
1852 lt = Qualifiers::OCL_ExplicitNone;
1855 if (lt == Qualifiers::OCL_Strong) {
1857 if (CGM.getCodeGenOpts().OptimizationLevel == 0) {
1858 // use objc_storeStrong(&dest, value) for retaining the
1859 // object. But first, store a null into 'dest' because
1860 // objc_storeStrong attempts to release its old value.
1861 llvm::Value *Null = CGM.EmitNullConstant(D.getType());
1862 EmitStoreOfScalar(Null, lv, /* isInitialization */ true);
1863 EmitARCStoreStrongCall(lv.getAddress(), ArgVal, true);
1867 // Don't use objc_retainBlock for block pointers, because we
1868 // don't want to Block_copy something just because we got it
1870 ArgVal = EmitARCRetainNonBlock(ArgVal);
1873 // Push the cleanup for a consumed parameter.
1875 ARCPreciseLifetime_t precise = (D.hasAttr<ObjCPreciseLifetimeAttr>()
1876 ? ARCPreciseLifetime : ARCImpreciseLifetime);
1877 EHStack.pushCleanup<ConsumeARCParameter>(getARCCleanupKind(), ArgVal,
1881 if (lt == Qualifiers::OCL_Weak) {
1882 EmitARCInitWeak(DeclPtr, ArgVal);
1883 DoStore = false; // The weak init is a store, no need to do two.
1887 // Enter the cleanup scope.
1888 EmitAutoVarWithLifetime(*this, D, DeclPtr, lt);
1892 // Store the initial value into the alloca.
1894 EmitStoreOfScalar(ArgVal, lv, /* isInitialization */ true);
1896 setAddrOfLocalVar(&D, DeclPtr);
1898 // Emit debug info for param declaration.
1899 if (CGDebugInfo *DI = getDebugInfo()) {
1900 if (CGM.getCodeGenOpts().getDebugInfo() >=
1901 codegenoptions::LimitedDebugInfo) {
1902 DI->EmitDeclareOfArgVariable(&D, DeclPtr.getPointer(), ArgNo, Builder);
1906 if (D.hasAttr<AnnotateAttr>())
1907 EmitVarAnnotations(&D, DeclPtr.getPointer());
1909 // We can only check return value nullability if all arguments to the
1910 // function satisfy their nullability preconditions. This makes it necessary
1911 // to emit null checks for args in the function body itself.
1912 if (requiresReturnValueNullabilityCheck()) {
1913 auto Nullability = Ty->getNullability(getContext());
1914 if (Nullability && *Nullability == NullabilityKind::NonNull) {
1915 SanitizerScope SanScope(this);
1916 RetValNullabilityPrecondition =
1917 Builder.CreateAnd(RetValNullabilityPrecondition,
1918 Builder.CreateIsNotNull(Arg.getAnyValue()));
1923 void CodeGenModule::EmitOMPDeclareReduction(const OMPDeclareReductionDecl *D,
1924 CodeGenFunction *CGF) {
1925 if (!LangOpts.OpenMP || (!LangOpts.EmitAllDecls && !D->isUsed()))
1927 getOpenMPRuntime().emitUserDefinedReduction(CGF, D);