1	//===--- CGDecl.cpp - Emit LLVM Code for declarations ---------------------===//
2	//
3	// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4	// See https://llvm.org/LICENSE.txt for license information.
5	// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6	//
7	//===----------------------------------------------------------------------===//
8	//
9	// This contains code to emit Decl nodes as LLVM code.
10	//
11	//===----------------------------------------------------------------------===//
12
13	#include "CGBlocks.h"
14	#include "CGCXXABI.h"
15	#include "CGCleanup.h"
16	#include "CGDebugInfo.h"
17	#include "CGOpenCLRuntime.h"
18	#include "CGOpenMPRuntime.h"
19	#include "CodeGenFunction.h"
20	#include "CodeGenModule.h"
21	#include "ConstantEmitter.h"
22	#include "PatternInit.h"
23	#include "TargetInfo.h"
24	#include "clang/AST/ASTContext.h"
25	#include "clang/AST/Attr.h"
26	#include "clang/AST/CharUnits.h"
27	#include "clang/AST/Decl.h"
28	#include "clang/AST/DeclObjC.h"
29	#include "clang/AST/DeclOpenMP.h"
30	#include "clang/Basic/CodeGenOptions.h"
31	#include "clang/Basic/SourceManager.h"
32	#include "clang/Basic/TargetInfo.h"
33	#include "clang/CodeGen/CGFunctionInfo.h"
34	#include "clang/Sema/Sema.h"
35	#include "llvm/Analysis/ValueTracking.h"
36	#include "llvm/IR/DataLayout.h"
37	#include "llvm/IR/GlobalVariable.h"
38	#include "llvm/IR/Intrinsics.h"
39	#include "llvm/IR/Type.h"
40	#include <optional>
41
42	using namespace clang;
43	using namespace CodeGen;
44
45	static_assert(clang::Sema::MaximumAlignment <= llvm::Value::MaximumAlignment,
46	"Clang max alignment greater than what LLVM supports?");
47
48	void CodeGenFunction::EmitDecl(const Decl &D) {
49	switch (D.getKind()) {
50	case Decl::BuiltinTemplate:
51	case Decl::TranslationUnit:
52	case Decl::ExternCContext:
53	case Decl::Namespace:
54	case Decl::UnresolvedUsingTypename:
55	case Decl::ClassTemplateSpecialization:
56	case Decl::ClassTemplatePartialSpecialization:
57	case Decl::VarTemplateSpecialization:
58	case Decl::VarTemplatePartialSpecialization:
59	case Decl::TemplateTypeParm:
60	case Decl::UnresolvedUsingValue:
61	case Decl::NonTypeTemplateParm:
62	case Decl::CXXDeductionGuide:
63	case Decl::CXXMethod:
64	case Decl::CXXConstructor:
65	case Decl::CXXDestructor:
66	case Decl::CXXConversion:
67	case Decl::Field:
68	case Decl::MSProperty:
69	case Decl::IndirectField:
70	case Decl::ObjCIvar:
71	case Decl::ObjCAtDefsField:
72	case Decl::ParmVar:
73	case Decl::ImplicitParam:
74	case Decl::ClassTemplate:
75	case Decl::VarTemplate:
76	case Decl::FunctionTemplate:
77	case Decl::TypeAliasTemplate:
78	case Decl::TemplateTemplateParm:
79	case Decl::ObjCMethod:
80	case Decl::ObjCCategory:
81	case Decl::ObjCProtocol:
82	case Decl::ObjCInterface:
83	case Decl::ObjCCategoryImpl:
84	case Decl::ObjCImplementation:
85	case Decl::ObjCProperty:
86	case Decl::ObjCCompatibleAlias:
87	case Decl::PragmaComment:
88	case Decl::PragmaDetectMismatch:
89	case Decl::AccessSpec:
90	case Decl::LinkageSpec:
91	case Decl::Export:
92	case Decl::ObjCPropertyImpl:
93	case Decl::FileScopeAsm:
94	case Decl::TopLevelStmt:
95	case Decl::Friend:
96	case Decl::FriendTemplate:
97	case Decl::Block:
98	case Decl::Captured:
99	case Decl::UsingShadow:
100	case Decl::ConstructorUsingShadow:
101	case Decl::ObjCTypeParam:
102	case Decl::Binding:
103	case Decl::UnresolvedUsingIfExists:
104	case Decl::HLSLBuffer:
105	llvm_unreachable("Declaration should not be in declstmts!");
106	case Decl::Record: // struct/union/class X;
107	case Decl::CXXRecord: // struct/union/class X; [C++]
108	if (CGDebugInfo *DI = getDebugInfo())
109	if (cast<RecordDecl>(Val: D).getDefinition())
110	DI->EmitAndRetainType(Ty: getContext().getRecordType(Decl: cast<RecordDecl>(Val: &D)));
111	return;
112	case Decl::Enum: // enum X;
113	if (CGDebugInfo *DI = getDebugInfo())
114	if (cast<EnumDecl>(Val: D).getDefinition())
115	DI->EmitAndRetainType(Ty: getContext().getEnumType(Decl: cast<EnumDecl>(Val: &D)));
116	return;
117	case Decl::Function: // void X();
118	case Decl::EnumConstant: // enum ? { X = ? }
119	case Decl::StaticAssert: // static_assert(X, ""); [C++0x]
120	case Decl::Label: // __label__ x;
121	case Decl::Import:
122	case Decl::MSGuid: // __declspec(uuid("..."))
123	case Decl::UnnamedGlobalConstant:
124	case Decl::TemplateParamObject:
125	case Decl::OMPThreadPrivate:
126	case Decl::OMPAllocate:
127	case Decl::OMPCapturedExpr:
128	case Decl::OMPRequires:
129	case Decl::Empty:
130	case Decl::Concept:
131	case Decl::ImplicitConceptSpecialization:
132	case Decl::LifetimeExtendedTemporary:
133	case Decl::RequiresExprBody:
134	// None of these decls require codegen support.
135	return;
136
137	case Decl::NamespaceAlias:
138	if (CGDebugInfo *DI = getDebugInfo())
139	DI->EmitNamespaceAlias(NA: cast<NamespaceAliasDecl>(Val: D));
140	return;
141	case Decl::Using: // using X; [C++]
142	if (CGDebugInfo *DI = getDebugInfo())
143	DI->EmitUsingDecl(UD: cast<UsingDecl>(Val: D));
144	return;
145	case Decl::UsingEnum: // using enum X; [C++]
146	if (CGDebugInfo *DI = getDebugInfo())
147	DI->EmitUsingEnumDecl(UD: cast<UsingEnumDecl>(Val: D));
148	return;
149	case Decl::UsingPack:
150	for (auto *Using : cast<UsingPackDecl>(Val: D).expansions())
151	EmitDecl(*Using);
152	return;
153	case Decl::UsingDirective: // using namespace X; [C++]
154	if (CGDebugInfo *DI = getDebugInfo())
155	DI->EmitUsingDirective(UD: cast<UsingDirectiveDecl>(Val: D));
156	return;
157	case Decl::Var:
158	case Decl::Decomposition: {
159	const VarDecl &VD = cast<VarDecl>(Val: D);
160	assert(VD.isLocalVarDecl() &&
161	"Should not see file-scope variables inside a function!");
162	EmitVarDecl(D: VD);
163	if (auto *DD = dyn_cast<DecompositionDecl>(Val: &VD))
164	for (auto *B : DD->bindings())
165	if (auto *HD = B->getHoldingVar())
166	EmitVarDecl(D: *HD);
167	return;
168	}
169
170	case Decl::OMPDeclareReduction:
171	return CGM.EmitOMPDeclareReduction(D: cast<OMPDeclareReductionDecl>(Val: &D), CGF: this);
172
173	case Decl::OMPDeclareMapper:
174	return CGM.EmitOMPDeclareMapper(D: cast<OMPDeclareMapperDecl>(Val: &D), CGF: this);
175
176	case Decl::Typedef: // typedef int X;
177	case Decl::TypeAlias: { // using X = int; [C++0x]
178	QualType Ty = cast<TypedefNameDecl>(Val: D).getUnderlyingType();
179	if (CGDebugInfo *DI = getDebugInfo())
180	DI->EmitAndRetainType(Ty);
181	if (Ty->isVariablyModifiedType())
182	EmitVariablyModifiedType(Ty);
183	return;
184	}
185	}
186	}
187
188	/// EmitVarDecl - This method handles emission of any variable declaration
189	/// inside a function, including static vars etc.
190	void CodeGenFunction::EmitVarDecl(const VarDecl &D) {
191	if (D.hasExternalStorage())
192	// Don't emit it now, allow it to be emitted lazily on its first use.
193	return;
194
195	// Some function-scope variable does not have static storage but still
196	// needs to be emitted like a static variable, e.g. a function-scope
197	// variable in constant address space in OpenCL.
198	if (D.getStorageDuration() != SD_Automatic) {
199	// Static sampler variables translated to function calls.
200	if (D.getType()->isSamplerT())
201	return;
202
203	llvm::GlobalValue::LinkageTypes Linkage =
204	CGM.getLLVMLinkageVarDefinition(VD: &D);
205
206	// FIXME: We need to force the emission/use of a guard variable for
207	// some variables even if we can constant-evaluate them because
208	// we can't guarantee every translation unit will constant-evaluate them.
209
210	return EmitStaticVarDecl(D, Linkage);
211	}
212
213	if (D.getType().getAddressSpace() == LangAS::opencl_local)
214	return CGM.getOpenCLRuntime().EmitWorkGroupLocalVarDecl(CGF&: *this, D);
215
216	assert(D.hasLocalStorage());
217	return EmitAutoVarDecl(D);
218	}
219
220	static std::string getStaticDeclName(CodeGenModule &CGM, const VarDecl &D) {
221	if (CGM.getLangOpts().CPlusPlus)
222	return CGM.getMangledName(GD: &D).str();
223
224	// If this isn't C++, we don't need a mangled name, just a pretty one.
225	assert(!D.isExternallyVisible() && "name shouldn't matter");
226	std::string ContextName;
227	const DeclContext *DC = D.getDeclContext();
228	if (auto *CD = dyn_cast<CapturedDecl>(DC))
229	DC = cast<DeclContext>(CD->getNonClosureContext());
230	if (const auto *FD = dyn_cast<FunctionDecl>(DC))
231	ContextName = std::string(CGM.getMangledName(GD: FD));
232	else if (const auto *BD = dyn_cast<BlockDecl>(DC))
233	ContextName = std::string(CGM.getBlockMangledName(GD: GlobalDecl(), BD: BD));
234	else if (const auto *OMD = dyn_cast<ObjCMethodDecl>(DC))
235	ContextName = OMD->getSelector().getAsString();
236	else
237	llvm_unreachable("Unknown context for static var decl");
238
239	ContextName += "." + D.getNameAsString();
240	return ContextName;
241	}
242
243	llvm::Constant *CodeGenModule::getOrCreateStaticVarDecl(
244	const VarDecl &D, llvm::GlobalValue::LinkageTypes Linkage) {
245	// In general, we don't always emit static var decls once before we reference
246	// them. It is possible to reference them before emitting the function that
247	// contains them, and it is possible to emit the containing function multiple
248	// times.
249	if (llvm::Constant *ExistingGV = StaticLocalDeclMap[&D])
250	return ExistingGV;
251
252	QualType Ty = D.getType();
253	assert(Ty->isConstantSizeType() && "VLAs can't be static");
254
255	// Use the label if the variable is renamed with the asm-label extension.
256	std::string Name;
257	if (D.hasAttr<AsmLabelAttr>())
258	Name = std::string(getMangledName(GD: &D));
259	else
260	Name = getStaticDeclName(CGM&: *this, D);
261
262	llvm::Type *LTy = getTypes().ConvertTypeForMem(T: Ty);
263	LangAS AS = GetGlobalVarAddressSpace(D: &D);
264	unsigned TargetAS = getContext().getTargetAddressSpace(AS);
265
266	// OpenCL variables in local address space and CUDA shared
267	// variables cannot have an initializer.
268	llvm::Constant *Init = nullptr;
269	if (Ty.getAddressSpace() == LangAS::opencl_local ||
270	D.hasAttr<CUDASharedAttr>() || D.hasAttr<LoaderUninitializedAttr>())
271	Init = llvm::UndefValue::get(T: LTy);
272	else
273	Init = EmitNullConstant(T: Ty);
274
275	llvm::GlobalVariable *GV = new llvm::GlobalVariable(
276	getModule(), LTy, Ty.isConstant(Ctx: getContext()), Linkage, Init, Name,
277	nullptr, llvm::GlobalVariable::NotThreadLocal, TargetAS);
278	GV->setAlignment(getContext().getDeclAlign(&D).getAsAlign());
279
280	if (supportsCOMDAT() && GV->isWeakForLinker())
281	GV->setComdat(TheModule.getOrInsertComdat(Name: GV->getName()));
282
283	if (D.getTLSKind())
284	setTLSMode(GV, D);
285
286	setGVProperties(GV, GD: &D);
287
288	// Make sure the result is of the correct type.
289	LangAS ExpectedAS = Ty.getAddressSpace();
290	llvm::Constant *Addr = GV;
291	if (AS != ExpectedAS) {
292	Addr = getTargetCodeGenInfo().performAddrSpaceCast(
293	CGM&: *this, V: GV, SrcAddr: AS, DestAddr: ExpectedAS,
294	DestTy: llvm::PointerType::get(C&: getLLVMContext(),
295	AddressSpace: getContext().getTargetAddressSpace(AS: ExpectedAS)));
296	}
297
298	setStaticLocalDeclAddress(D: &D, C: Addr);
299
300	// Ensure that the static local gets initialized by making sure the parent
301	// function gets emitted eventually.
302	const Decl *DC = cast<Decl>(D.getDeclContext());
303
304	// We can't name blocks or captured statements directly, so try to emit their
305	// parents.
306	if (isa<BlockDecl>(Val: DC) || isa<CapturedDecl>(Val: DC)) {
307	DC = DC->getNonClosureContext();
308	// FIXME: Ensure that global blocks get emitted.
309	if (!DC)
310	return Addr;
311	}
312
313	GlobalDecl GD;
314	if (const auto *CD = dyn_cast<CXXConstructorDecl>(DC))
315	GD = GlobalDecl(CD, Ctor_Base);
316	else if (const auto *DD = dyn_cast<CXXDestructorDecl>(DC))
317	GD = GlobalDecl(DD, Dtor_Base);
318	else if (const auto *FD = dyn_cast<FunctionDecl>(DC))
319	GD = GlobalDecl(FD);
320	else {
321	// Don't do anything for Obj-C method decls or global closures. We should
322	// never defer them.
323	assert(isa<ObjCMethodDecl>(DC) && "unexpected parent code decl");
324	}
325	if (GD.getDecl()) {
326	// Disable emission of the parent function for the OpenMP device codegen.
327	CGOpenMPRuntime::DisableAutoDeclareTargetRAII NoDeclTarget(*this);
328	(void)GetAddrOfGlobal(GD);
329	}
330
331	return Addr;
332	}
333
334	/// AddInitializerToStaticVarDecl - Add the initializer for 'D' to the
335	/// global variable that has already been created for it. If the initializer
336	/// has a different type than GV does, this may free GV and return a different
337	/// one. Otherwise it just returns GV.
338	llvm::GlobalVariable *
339	CodeGenFunction::AddInitializerToStaticVarDecl(const VarDecl &D,
340	llvm::GlobalVariable *GV) {
341	ConstantEmitter emitter(*this);
342	llvm::Constant *Init = emitter.tryEmitForInitializer(D);
343
344	// If constant emission failed, then this should be a C++ static
345	// initializer.
346	if (!Init) {
347	if (!getLangOpts().CPlusPlus)
348	CGM.ErrorUnsupported(D.getInit(), "constant l-value expression");
349	else if (D.hasFlexibleArrayInit(Ctx: getContext()))
350	CGM.ErrorUnsupported(D.getInit(), "flexible array initializer");
351	else if (HaveInsertPoint()) {
352	// Since we have a static initializer, this global variable can't
353	// be constant.
354	GV->setConstant(false);
355
356	EmitCXXGuardedInit(D, DeclPtr: GV, /*PerformInit*/true);
357	}
358	return GV;
359	}
360
361	#ifndef NDEBUG
362	CharUnits VarSize = CGM.getContext().getTypeSizeInChars(D.getType()) +
363	D.getFlexibleArrayInitChars(Ctx: getContext());
364	CharUnits CstSize = CharUnits::fromQuantity(
365	Quantity: CGM.getDataLayout().getTypeAllocSize(Ty: Init->getType()));
366	assert(VarSize == CstSize && "Emitted constant has unexpected size");
367	#endif
368
369	// The initializer may differ in type from the global. Rewrite
370	// the global to match the initializer. (We have to do this
371	// because some types, like unions, can't be completely represented
372	// in the LLVM type system.)
373	if (GV->getValueType() != Init->getType()) {
374	llvm::GlobalVariable *OldGV = GV;
375
376	GV = new llvm::GlobalVariable(
377	CGM.getModule(), Init->getType(), OldGV->isConstant(),
378	OldGV->getLinkage(), Init, "",
379	/*InsertBefore*/ OldGV, OldGV->getThreadLocalMode(),
380	OldGV->getType()->getPointerAddressSpace());
381	GV->setVisibility(OldGV->getVisibility());
382	GV->setDSOLocal(OldGV->isDSOLocal());
383	GV->setComdat(OldGV->getComdat());
384
385	// Steal the name of the old global
386	GV->takeName(V: OldGV);
387
388	// Replace all uses of the old global with the new global
389	OldGV->replaceAllUsesWith(V: GV);
390
391	// Erase the old global, since it is no longer used.
392	OldGV->eraseFromParent();
393	}
394
395	bool NeedsDtor =
396	D.needsDestruction(Ctx: getContext()) == QualType::DK_cxx_destructor;
397
398	GV->setConstant(
399	D.getType().isConstantStorage(getContext(), true, !NeedsDtor));
400	GV->setInitializer(Init);
401
402	emitter.finalize(global: GV);
403
404	if (NeedsDtor && HaveInsertPoint()) {
405	// We have a constant initializer, but a nontrivial destructor. We still
406	// need to perform a guarded "initialization" in order to register the
407	// destructor.
408	EmitCXXGuardedInit(D, DeclPtr: GV, /*PerformInit*/false);
409	}
410
411	return GV;
412	}
413
414	void CodeGenFunction::EmitStaticVarDecl(const VarDecl &D,
415	llvm::GlobalValue::LinkageTypes Linkage) {
416	// Check to see if we already have a global variable for this
417	// declaration. This can happen when double-emitting function
418	// bodies, e.g. with complete and base constructors.
419	llvm::Constant *addr = CGM.getOrCreateStaticVarDecl(D, Linkage);
420	CharUnits alignment = getContext().getDeclAlign(&D);
421
422	// Store into LocalDeclMap before generating initializer to handle
423	// circular references.
424	llvm::Type *elemTy = ConvertTypeForMem(T: D.getType());
425	setAddrOfLocalVar(VD: &D, Addr: Address(addr, elemTy, alignment));
426
427	// We can't have a VLA here, but we can have a pointer to a VLA,
428	// even though that doesn't really make any sense.
429	// Make sure to evaluate VLA bounds now so that we have them for later.
430	if (D.getType()->isVariablyModifiedType())
431	EmitVariablyModifiedType(Ty: D.getType());
432
433	// Save the type in case adding the initializer forces a type change.
434	llvm::Type *expectedType = addr->getType();
435
436	llvm::GlobalVariable *var =
437	cast<llvm::GlobalVariable>(Val: addr->stripPointerCasts());
438
439	// CUDA's local and local static __shared__ variables should not
440	// have any non-empty initializers. This is ensured by Sema.
441	// Whatever initializer such variable may have when it gets here is
442	// a no-op and should not be emitted.
443	bool isCudaSharedVar = getLangOpts().CUDA && getLangOpts().CUDAIsDevice &&
444	D.hasAttr<CUDASharedAttr>();
445	// If this value has an initializer, emit it.
446	if (D.getInit() && !isCudaSharedVar)
447	var = AddInitializerToStaticVarDecl(D, GV: var);
448
449	var->setAlignment(alignment.getAsAlign());
450
451	if (D.hasAttr<AnnotateAttr>())
452	CGM.AddGlobalAnnotations(&D, var);
453
454	if (auto *SA = D.getAttr<PragmaClangBSSSectionAttr>())
455	var->addAttribute("bss-section", SA->getName());
456	if (auto *SA = D.getAttr<PragmaClangDataSectionAttr>())
457	var->addAttribute("data-section", SA->getName());
458	if (auto *SA = D.getAttr<PragmaClangRodataSectionAttr>())
459	var->addAttribute("rodata-section", SA->getName());
460	if (auto *SA = D.getAttr<PragmaClangRelroSectionAttr>())
461	var->addAttribute("relro-section", SA->getName());
462
463	if (const SectionAttr *SA = D.getAttr<SectionAttr>())
464	var->setSection(SA->getName());
465
466	if (D.hasAttr<RetainAttr>())
467	CGM.addUsedGlobal(GV: var);
468	else if (D.hasAttr<UsedAttr>())
469	CGM.addUsedOrCompilerUsedGlobal(GV: var);
470
471	if (CGM.getCodeGenOpts().KeepPersistentStorageVariables)
472	CGM.addUsedOrCompilerUsedGlobal(GV: var);
473
474	// We may have to cast the constant because of the initializer
475	// mismatch above.
476	//
477	// FIXME: It is really dangerous to store this in the map; if anyone
478	// RAUW's the GV uses of this constant will be invalid.
479	llvm::Constant *castedAddr =
480	llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(C: var, Ty: expectedType);
481	LocalDeclMap.find(&D)->second = Address(castedAddr, elemTy, alignment);
482	CGM.setStaticLocalDeclAddress(D: &D, C: castedAddr);
483
484	CGM.getSanitizerMetadata()->reportGlobal(GV: var, D);
485
486	// Emit global variable debug descriptor for static vars.
487	CGDebugInfo *DI = getDebugInfo();
488	if (DI && CGM.getCodeGenOpts().hasReducedDebugInfo()) {
489	DI->setLocation(D.getLocation());
490	DI->EmitGlobalVariable(GV: var, Decl: &D);
491	}
492	}
493
494	namespace {
495	struct DestroyObject final : EHScopeStack::Cleanup {
496	DestroyObject(Address addr, QualType type,
497	CodeGenFunction::Destroyer *destroyer,
498	bool useEHCleanupForArray)
499	: addr(addr), type(type), destroyer(destroyer),
500	useEHCleanupForArray(useEHCleanupForArray) {}
501
502	Address addr;
503	QualType type;
504	CodeGenFunction::Destroyer *destroyer;
505	bool useEHCleanupForArray;
506
507	void Emit(CodeGenFunction &CGF, Flags flags) override {
508	// Don't use an EH cleanup recursively from an EH cleanup.
509	bool useEHCleanupForArray =
510	flags.isForNormalCleanup() && this->useEHCleanupForArray;
511
512	CGF.emitDestroy(addr, type, destroyer, useEHCleanupForArray);
513	}
514	};
515
516	template <class Derived>
517	struct DestroyNRVOVariable : EHScopeStack::Cleanup {
518	DestroyNRVOVariable(Address addr, QualType type, llvm::Value *NRVOFlag)
519	: NRVOFlag(NRVOFlag), Loc(addr), Ty(type) {}
520
521	llvm::Value *NRVOFlag;
522	Address Loc;
523	QualType Ty;
524
525	void Emit(CodeGenFunction &CGF, Flags flags) override {
526	// Along the exceptions path we always execute the dtor.
527	bool NRVO = flags.isForNormalCleanup() && NRVOFlag;
528
529	llvm::BasicBlock *SkipDtorBB = nullptr;
530	if (NRVO) {
531	// If we exited via NRVO, we skip the destructor call.
532	llvm::BasicBlock *RunDtorBB = CGF.createBasicBlock(name: "nrvo.unused");
533	SkipDtorBB = CGF.createBasicBlock(name: "nrvo.skipdtor");
534	llvm::Value *DidNRVO =
535	CGF.Builder.CreateFlagLoad(Addr: NRVOFlag, Name: "nrvo.val");
536	CGF.Builder.CreateCondBr(Cond: DidNRVO, True: SkipDtorBB, False: RunDtorBB);
537	CGF.EmitBlock(BB: RunDtorBB);
538	}
539
540	static_cast<Derived *>(this)->emitDestructorCall(CGF);
541
542	if (NRVO) CGF.EmitBlock(BB: SkipDtorBB);
543	}
544
545	virtual ~DestroyNRVOVariable() = default;
546	};
547
548	struct DestroyNRVOVariableCXX final
549	: DestroyNRVOVariable<DestroyNRVOVariableCXX> {
550	DestroyNRVOVariableCXX(Address addr, QualType type,
551	const CXXDestructorDecl *Dtor, llvm::Value *NRVOFlag)
552	: DestroyNRVOVariable<DestroyNRVOVariableCXX>(addr, type, NRVOFlag),
553	Dtor(Dtor) {}
554
555	const CXXDestructorDecl *Dtor;
556
557	void emitDestructorCall(CodeGenFunction &CGF) {
558	CGF.EmitCXXDestructorCall(Dtor, Dtor_Complete,
559	/*ForVirtualBase=*/false,
560	/*Delegating=*/false, Loc, Ty);
561	}
562	};
563
564	struct DestroyNRVOVariableC final
565	: DestroyNRVOVariable<DestroyNRVOVariableC> {
566	DestroyNRVOVariableC(Address addr, llvm::Value *NRVOFlag, QualType Ty)
567	: DestroyNRVOVariable<DestroyNRVOVariableC>(addr, Ty, NRVOFlag) {}
568
569	void emitDestructorCall(CodeGenFunction &CGF) {
570	CGF.destroyNonTrivialCStruct(CGF, Loc, Ty);
571	}
572	};
573
574	struct CallStackRestore final : EHScopeStack::Cleanup {
575	Address Stack;
576	CallStackRestore(Address Stack) : Stack(Stack) {}
577	bool isRedundantBeforeReturn() override { return true; }
578	void Emit(CodeGenFunction &CGF, Flags flags) override {
579	llvm::Value *V = CGF.Builder.CreateLoad(Addr: Stack);
580	CGF.Builder.CreateStackRestore(Ptr: V);
581	}
582	};
583
584	struct KmpcAllocFree final : EHScopeStack::Cleanup {
585	std::pair<llvm::Value *, llvm::Value *> AddrSizePair;
586	KmpcAllocFree(const std::pair<llvm::Value *, llvm::Value *> &AddrSizePair)
587	: AddrSizePair(AddrSizePair) {}
588	void Emit(CodeGenFunction &CGF, Flags EmissionFlags) override {
589	auto &RT = CGF.CGM.getOpenMPRuntime();
590	RT.getKmpcFreeShared(CGF, AddrSizePair);
591	}
592	};
593
594	struct ExtendGCLifetime final : EHScopeStack::Cleanup {
595	const VarDecl &Var;
596	ExtendGCLifetime(const VarDecl *var) : Var(*var) {}
597
598	void Emit(CodeGenFunction &CGF, Flags flags) override {
599	// Compute the address of the local variable, in case it's a
600	// byref or something.
601	DeclRefExpr DRE(CGF.getContext(), const_cast<VarDecl *>(&Var), false,
602	Var.getType(), VK_LValue, SourceLocation());
603	llvm::Value *value = CGF.EmitLoadOfScalar(lvalue: CGF.EmitDeclRefLValue(E: &DRE),
604	Loc: SourceLocation());
605	CGF.EmitExtendGCLifetime(object: value);
606	}
607	};
608
609	struct CallCleanupFunction final : EHScopeStack::Cleanup {
610	llvm::Constant *CleanupFn;
611	const CGFunctionInfo &FnInfo;
612	const VarDecl &Var;
613
614	CallCleanupFunction(llvm::Constant *CleanupFn, const CGFunctionInfo *Info,
615	const VarDecl *Var)
616	: CleanupFn(CleanupFn), FnInfo(*Info), Var(*Var) {}
617
618	void Emit(CodeGenFunction &CGF, Flags flags) override {
619	DeclRefExpr DRE(CGF.getContext(), const_cast<VarDecl *>(&Var), false,
620	Var.getType(), VK_LValue, SourceLocation());
621	// Compute the address of the local variable, in case it's a byref
622	// or something.
623	llvm::Value *Addr = CGF.EmitDeclRefLValue(E: &DRE).getPointer(CGF);
624
625	// In some cases, the type of the function argument will be different from
626	// the type of the pointer. An example of this is
627	// void f(void* arg);
628	// __attribute__((cleanup(f))) void *g;
629	//
630	// To fix this we insert a bitcast here.
631	QualType ArgTy = FnInfo.arg_begin()->type;
632	llvm::Value *Arg =
633	CGF.Builder.CreateBitCast(V: Addr, DestTy: CGF.ConvertType(T: ArgTy));
634
635	CallArgList Args;
636	Args.add(rvalue: RValue::get(V: Arg),
637	type: CGF.getContext().getPointerType(Var.getType()));
638	auto Callee = CGCallee::forDirect(functionPtr: CleanupFn);
639	CGF.EmitCall(CallInfo: FnInfo, Callee, ReturnValue: ReturnValueSlot(), Args);
640	}
641	};
642	} // end anonymous namespace
643
644	/// EmitAutoVarWithLifetime - Does the setup required for an automatic
645	/// variable with lifetime.
646	static void EmitAutoVarWithLifetime(CodeGenFunction &CGF, const VarDecl &var,
647	Address addr,
648	Qualifiers::ObjCLifetime lifetime) {
649	switch (lifetime) {
650	case Qualifiers::OCL_None:
651	llvm_unreachable("present but none");
652
653	case Qualifiers::OCL_ExplicitNone:
654	// nothing to do
655	break;
656
657	case Qualifiers::OCL_Strong: {
658	CodeGenFunction::Destroyer *destroyer =
659	(var.hasAttr<ObjCPreciseLifetimeAttr>()
660	? CodeGenFunction::destroyARCStrongPrecise
661	: CodeGenFunction::destroyARCStrongImprecise);
662
663	CleanupKind cleanupKind = CGF.getARCCleanupKind();
664	CGF.pushDestroy(cleanupKind, addr, var.getType(), destroyer,
665	cleanupKind & EHCleanup);
666	break;
667	}
668	case Qualifiers::OCL_Autoreleasing:
669	// nothing to do
670	break;
671
672	case Qualifiers::OCL_Weak:
673	// __weak objects always get EH cleanups; otherwise, exceptions
674	// could cause really nasty crashes instead of mere leaks.
675	CGF.pushDestroy(NormalAndEHCleanup, addr, var.getType(),
676	CodeGenFunction::destroyARCWeak,
677	/*useEHCleanup*/ true);
678	break;
679	}
680	}
681
682	static bool isAccessedBy(const VarDecl &var, const Stmt *s) {
683	if (const Expr *e = dyn_cast<Expr>(Val: s)) {
684	// Skip the most common kinds of expressions that make
685	// hierarchy-walking expensive.
686	s = e = e->IgnoreParenCasts();
687
688	if (const DeclRefExpr *ref = dyn_cast<DeclRefExpr>(Val: e))
689	return (ref->getDecl() == &var);
690	if (const BlockExpr *be = dyn_cast<BlockExpr>(Val: e)) {
691	const BlockDecl *block = be->getBlockDecl();
692	for (const auto &I : block->captures()) {
693	if (I.getVariable() == &var)
694	return true;
695	}
696	}
697	}
698
699	for (const Stmt *SubStmt : s->children())
700	// SubStmt might be null; as in missing decl or conditional of an if-stmt.
701	if (SubStmt && isAccessedBy(var, s: SubStmt))
702	return true;
703
704	return false;
705	}
706
707	static bool isAccessedBy(const ValueDecl *decl, const Expr *e) {
708	if (!decl) return false;
709	if (!isa<VarDecl>(Val: decl)) return false;
710	const VarDecl *var = cast<VarDecl>(Val: decl);
711	return isAccessedBy(*var, e);
712	}
713
714	static bool tryEmitARCCopyWeakInit(CodeGenFunction &CGF,
715	const LValue &destLV, const Expr *init) {
716	bool needsCast = false;
717
718	while (auto castExpr = dyn_cast<CastExpr>(Val: init->IgnoreParens())) {
719	switch (castExpr->getCastKind()) {
720	// Look through casts that don't require representation changes.
721	case CK_NoOp:
722	case CK_BitCast:
723	case CK_BlockPointerToObjCPointerCast:
724	needsCast = true;
725	break;
726
727	// If we find an l-value to r-value cast from a __weak variable,
728	// emit this operation as a copy or move.
729	case CK_LValueToRValue: {
730	const Expr *srcExpr = castExpr->getSubExpr();
731	if (srcExpr->getType().getObjCLifetime() != Qualifiers::OCL_Weak)
732	return false;
733
734	// Emit the source l-value.
735	LValue srcLV = CGF.EmitLValue(E: srcExpr);
736
737	// Handle a formal type change to avoid asserting.
738	auto srcAddr = srcLV.getAddress(CGF);
739	if (needsCast) {
740	srcAddr =
741	srcAddr.withElementType(ElemTy: destLV.getAddress(CGF).getElementType());
742	}
743
744	// If it was an l-value, use objc_copyWeak.
745	if (srcExpr->isLValue()) {
746	CGF.EmitARCCopyWeak(dst: destLV.getAddress(CGF), src: srcAddr);
747	} else {
748	assert(srcExpr->isXValue());
749	CGF.EmitARCMoveWeak(dst: destLV.getAddress(CGF), src: srcAddr);
750	}
751	return true;
752	}
753
754	// Stop at anything else.
755	default:
756	return false;
757	}
758
759	init = castExpr->getSubExpr();
760	}
761	return false;
762	}
763
764	static void drillIntoBlockVariable(CodeGenFunction &CGF,
765	LValue &lvalue,
766	const VarDecl *var) {
767	lvalue.setAddress(CGF.emitBlockByrefAddress(baseAddr: lvalue.getAddress(CGF), V: var));
768	}
769
770	void CodeGenFunction::EmitNullabilityCheck(LValue LHS, llvm::Value *RHS,
771	SourceLocation Loc) {
772	if (!SanOpts.has(K: SanitizerKind::NullabilityAssign))
773	return;
774
775	auto Nullability = LHS.getType()->getNullability();
776	if (!Nullability || *Nullability != NullabilityKind::NonNull)
777	return;
778
779	// Check if the right hand side of the assignment is nonnull, if the left
780	// hand side must be nonnull.
781	SanitizerScope SanScope(this);
782	llvm::Value *IsNotNull = Builder.CreateIsNotNull(Arg: RHS);
783	llvm::Constant *StaticData[] = {
784	EmitCheckSourceLocation(Loc), EmitCheckTypeDescriptor(T: LHS.getType()),
785	llvm::ConstantInt::get(Ty: Int8Ty, V: 0), // The LogAlignment info is unused.
786	llvm::ConstantInt::get(Ty: Int8Ty, V: TCK_NonnullAssign)};
787	EmitCheck(Checked: {{IsNotNull, SanitizerKind::NullabilityAssign}},
788	Check: SanitizerHandler::TypeMismatch, StaticArgs: StaticData, DynamicArgs: RHS);
789	}
790
791	void CodeGenFunction::EmitScalarInit(const Expr *init, const ValueDecl *D,
792	LValue lvalue, bool capturedByInit) {
793	Qualifiers::ObjCLifetime lifetime = lvalue.getObjCLifetime();
794	if (!lifetime) {
795	llvm::Value *value = EmitScalarExpr(E: init);
796	if (capturedByInit)
797	drillIntoBlockVariable(CGF&: *this, lvalue, var: cast<VarDecl>(Val: D));
798	EmitNullabilityCheck(LHS: lvalue, RHS: value, Loc: init->getExprLoc());
799	EmitStoreThroughLValue(Src: RValue::get(V: value), Dst: lvalue, isInit: true);
800	return;
801	}
802
803	if (const CXXDefaultInitExpr *DIE = dyn_cast<CXXDefaultInitExpr>(Val: init))
804	init = DIE->getExpr();
805
806	// If we're emitting a value with lifetime, we have to do the
807	// initialization *before* we leave the cleanup scopes.
808	if (auto *EWC = dyn_cast<ExprWithCleanups>(Val: init)) {
809	CodeGenFunction::RunCleanupsScope Scope(*this);
810	return EmitScalarInit(init: EWC->getSubExpr(), D, lvalue, capturedByInit);
811	}
812
813	// We have to maintain the illusion that the variable is
814	// zero-initialized. If the variable might be accessed in its
815	// initializer, zero-initialize before running the initializer, then
816	// actually perform the initialization with an assign.
817	bool accessedByInit = false;
818	if (lifetime != Qualifiers::OCL_ExplicitNone)
819	accessedByInit = (capturedByInit || isAccessedBy(decl: D, e: init));
820	if (accessedByInit) {
821	LValue tempLV = lvalue;
822	// Drill down to the __block object if necessary.
823	if (capturedByInit) {
824	// We can use a simple GEP for this because it can't have been
825	// moved yet.
826	tempLV.setAddress(emitBlockByrefAddress(baseAddr: tempLV.getAddress(CGF&: *this),
827	V: cast<VarDecl>(Val: D),
828	/*follow*/ followForward: false));
829	}
830
831	auto ty =
832	cast<llvm::PointerType>(Val: tempLV.getAddress(CGF&: *this).getElementType());
833	llvm::Value *zero = CGM.getNullPointer(T: ty, QT: tempLV.getType());
834
835	// If __weak, we want to use a barrier under certain conditions.
836	if (lifetime == Qualifiers::OCL_Weak)
837	EmitARCInitWeak(addr: tempLV.getAddress(CGF&: *this), value: zero);
838
839	// Otherwise just do a simple store.
840	else
841	EmitStoreOfScalar(value: zero, lvalue: tempLV, /* isInitialization */ isInit: true);
842	}
843
844	// Emit the initializer.
845	llvm::Value *value = nullptr;
846
847	switch (lifetime) {
848	case Qualifiers::OCL_None:
849	llvm_unreachable("present but none");
850
851	case Qualifiers::OCL_Strong: {
852	if (!D || !isa<VarDecl>(Val: D) || !cast<VarDecl>(Val: D)->isARCPseudoStrong()) {
853	value = EmitARCRetainScalarExpr(expr: init);
854	break;
855	}
856	// If D is pseudo-strong, treat it like __unsafe_unretained here. This means
857	// that we omit the retain, and causes non-autoreleased return values to be
858	// immediately released.
859	[[fallthrough]];
860	}
861
862	case Qualifiers::OCL_ExplicitNone:
863	value = EmitARCUnsafeUnretainedScalarExpr(expr: init);
864	break;
865
866	case Qualifiers::OCL_Weak: {
867	// If it's not accessed by the initializer, try to emit the
868	// initialization with a copy or move.
869	if (!accessedByInit && tryEmitARCCopyWeakInit(CGF&: *this, destLV: lvalue, init)) {
870	return;
871	}
872
873	// No way to optimize a producing initializer into this. It's not
874	// worth optimizing for, because the value will immediately
875	// disappear in the common case.
876	value = EmitScalarExpr(E: init);
877
878	if (capturedByInit) drillIntoBlockVariable(CGF&: *this, lvalue, var: cast<VarDecl>(Val: D));
879	if (accessedByInit)
880	EmitARCStoreWeak(addr: lvalue.getAddress(CGF&: *this), value, /*ignored*/ true);
881	else
882	EmitARCInitWeak(addr: lvalue.getAddress(CGF&: *this), value);
883	return;
884	}
885
886	case Qualifiers::OCL_Autoreleasing:
887	value = EmitARCRetainAutoreleaseScalarExpr(expr: init);
888	break;
889	}
890
891	if (capturedByInit) drillIntoBlockVariable(CGF&: *this, lvalue, var: cast<VarDecl>(Val: D));
892
893	EmitNullabilityCheck(LHS: lvalue, RHS: value, Loc: init->getExprLoc());
894
895	// If the variable might have been accessed by its initializer, we
896	// might have to initialize with a barrier. We have to do this for
897	// both __weak and __strong, but __weak got filtered out above.
898	if (accessedByInit && lifetime == Qualifiers::OCL_Strong) {
899	llvm::Value *oldValue = EmitLoadOfScalar(lvalue, Loc: init->getExprLoc());
900	EmitStoreOfScalar(value, lvalue, /* isInitialization */ isInit: true);
901	EmitARCRelease(value: oldValue, precise: ARCImpreciseLifetime);
902	return;
903	}
904
905	EmitStoreOfScalar(value, lvalue, /* isInitialization */ isInit: true);
906	}
907
908	/// Decide whether we can emit the non-zero parts of the specified initializer
909	/// with equal or fewer than NumStores scalar stores.
910	static bool canEmitInitWithFewStoresAfterBZero(llvm::Constant *Init,
911	unsigned &NumStores) {
912	// Zero and Undef never requires any extra stores.
913	if (isa<llvm::ConstantAggregateZero>(Val: Init) ||
914	isa<llvm::ConstantPointerNull>(Val: Init) ||
915	isa<llvm::UndefValue>(Val: Init))
916	return true;
917	if (isa<llvm::ConstantInt>(Val: Init) || isa<llvm::ConstantFP>(Val: Init) ||
918	isa<llvm::ConstantVector>(Val: Init) || isa<llvm::BlockAddress>(Val: Init) ||
919	isa<llvm::ConstantExpr>(Val: Init))
920	return Init->isNullValue() || NumStores--;
921
922	// See if we can emit each element.
923	if (isa<llvm::ConstantArray>(Val: Init) || isa<llvm::ConstantStruct>(Val: Init)) {
924	for (unsigned i = 0, e = Init->getNumOperands(); i != e; ++i) {
925	llvm::Constant *Elt = cast<llvm::Constant>(Val: Init->getOperand(i));
926	if (!canEmitInitWithFewStoresAfterBZero(Init: Elt, NumStores))
927	return false;
928	}
929	return true;
930	}
931
932	if (llvm::ConstantDataSequential *CDS =
933	dyn_cast<llvm::ConstantDataSequential>(Val: Init)) {
934	for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
935	llvm::Constant *Elt = CDS->getElementAsConstant(i);
936	if (!canEmitInitWithFewStoresAfterBZero(Init: Elt, NumStores))
937	return false;
938	}
939	return true;
940	}
941
942	// Anything else is hard and scary.
943	return false;
944	}
945
946	/// For inits that canEmitInitWithFewStoresAfterBZero returned true for, emit
947	/// the scalar stores that would be required.
948	static void emitStoresForInitAfterBZero(CodeGenModule &CGM,
949	llvm::Constant *Init, Address Loc,
950	bool isVolatile, CGBuilderTy &Builder,
951	bool IsAutoInit) {
952	assert(!Init->isNullValue() && !isa<llvm::UndefValue>(Init) &&
953	"called emitStoresForInitAfterBZero for zero or undef value.");
954
955	if (isa<llvm::ConstantInt>(Val: Init) || isa<llvm::ConstantFP>(Val: Init) ||
956	isa<llvm::ConstantVector>(Val: Init) || isa<llvm::BlockAddress>(Val: Init) ||
957	isa<llvm::ConstantExpr>(Val: Init)) {
958	auto *I = Builder.CreateStore(Val: Init, Addr: Loc, IsVolatile: isVolatile);
959	if (IsAutoInit)
960	I->addAnnotationMetadata(Annotation: "auto-init");
961	return;
962	}
963
964	if (llvm::ConstantDataSequential *CDS =
965	dyn_cast<llvm::ConstantDataSequential>(Val: Init)) {
966	for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
967	llvm::Constant *Elt = CDS->getElementAsConstant(i);
968
969	// If necessary, get a pointer to the element and emit it.
970	if (!Elt->isNullValue() && !isa<llvm::UndefValue>(Val: Elt))
971	emitStoresForInitAfterBZero(
972	CGM, Init: Elt, Loc: Builder.CreateConstInBoundsGEP2_32(Addr: Loc, Idx0: 0, Idx1: i), isVolatile,
973	Builder, IsAutoInit);
974	}
975	return;
976	}
977
978	assert((isa<llvm::ConstantStruct>(Init) || isa<llvm::ConstantArray>(Init)) &&
979	"Unknown value type!");
980
981	for (unsigned i = 0, e = Init->getNumOperands(); i != e; ++i) {
982	llvm::Constant *Elt = cast<llvm::Constant>(Val: Init->getOperand(i));
983
984	// If necessary, get a pointer to the element and emit it.
985	if (!Elt->isNullValue() && !isa<llvm::UndefValue>(Val: Elt))
986	emitStoresForInitAfterBZero(CGM, Init: Elt,
987	Loc: Builder.CreateConstInBoundsGEP2_32(Addr: Loc, Idx0: 0, Idx1: i),
988	isVolatile, Builder, IsAutoInit);
989	}
990	}
991
992	/// Decide whether we should use bzero plus some stores to initialize a local
993	/// variable instead of using a memcpy from a constant global. It is beneficial
994	/// to use bzero if the global is all zeros, or mostly zeros and large.
995	static bool shouldUseBZeroPlusStoresToInitialize(llvm::Constant *Init,
996	uint64_t GlobalSize) {
997	// If a global is all zeros, always use a bzero.
998	if (isa<llvm::ConstantAggregateZero>(Val: Init)) return true;
999
1000	// If a non-zero global is <= 32 bytes, always use a memcpy. If it is large,
1001	// do it if it will require 6 or fewer scalar stores.
1002	// TODO: Should budget depends on the size? Avoiding a large global warrants
1003	// plopping in more stores.
1004	unsigned StoreBudget = 6;
1005	uint64_t SizeLimit = 32;
1006
1007	return GlobalSize > SizeLimit &&
1008	canEmitInitWithFewStoresAfterBZero(Init, NumStores&: StoreBudget);
1009	}
1010
1011	/// Decide whether we should use memset to initialize a local variable instead
1012	/// of using a memcpy from a constant global. Assumes we've already decided to
1013	/// not user bzero.
1014	/// FIXME We could be more clever, as we are for bzero above, and generate
1015	/// memset followed by stores. It's unclear that's worth the effort.
1016	static llvm::Value *shouldUseMemSetToInitialize(llvm::Constant *Init,
1017	uint64_t GlobalSize,
1018	const llvm::DataLayout &DL) {
1019	uint64_t SizeLimit = 32;
1020	if (GlobalSize <= SizeLimit)
1021	return nullptr;
1022	return llvm::isBytewiseValue(V: Init, DL);
1023	}
1024
1025	/// Decide whether we want to split a constant structure or array store into a
1026	/// sequence of its fields' stores. This may cost us code size and compilation
1027	/// speed, but plays better with store optimizations.
1028	static bool shouldSplitConstantStore(CodeGenModule &CGM,
1029	uint64_t GlobalByteSize) {
1030	// Don't break things that occupy more than one cacheline.
1031	uint64_t ByteSizeLimit = 64;
1032	if (CGM.getCodeGenOpts().OptimizationLevel == 0)
1033	return false;
1034	if (GlobalByteSize <= ByteSizeLimit)
1035	return true;
1036	return false;
1037	}
1038
1039	enum class IsPattern { No, Yes };
1040
1041	/// Generate a constant filled with either a pattern or zeroes.
1042	static llvm::Constant *patternOrZeroFor(CodeGenModule &CGM, IsPattern isPattern,
1043	llvm::Type *Ty) {
1044	if (isPattern == IsPattern::Yes)
1045	return initializationPatternFor(CGM, Ty);
1046	else
1047	return llvm::Constant::getNullValue(Ty);
1048	}
1049
1050	static llvm::Constant *constWithPadding(CodeGenModule &CGM, IsPattern isPattern,
1051	llvm::Constant *constant);
1052
1053	/// Helper function for constWithPadding() to deal with padding in structures.
1054	static llvm::Constant *constStructWithPadding(CodeGenModule &CGM,
1055	IsPattern isPattern,
1056	llvm::StructType *STy,
1057	llvm::Constant *constant) {
1058	const llvm::DataLayout &DL = CGM.getDataLayout();
1059	const llvm::StructLayout *Layout = DL.getStructLayout(Ty: STy);
1060	llvm::Type *Int8Ty = llvm::IntegerType::getInt8Ty(C&: CGM.getLLVMContext());
1061	unsigned SizeSoFar = 0;
1062	SmallVector<llvm::Constant *, 8> Values;
1063	bool NestedIntact = true;
1064	for (unsigned i = 0, e = STy->getNumElements(); i != e; i++) {
1065	unsigned CurOff = Layout->getElementOffset(Idx: i);
1066	if (SizeSoFar < CurOff) {
1067	assert(!STy->isPacked());
1068	auto *PadTy = llvm::ArrayType::get(ElementType: Int8Ty, NumElements: CurOff - SizeSoFar);
1069	Values.push_back(Elt: patternOrZeroFor(CGM, isPattern, Ty: PadTy));
1070	}
1071	llvm::Constant *CurOp;
1072	if (constant->isZeroValue())
1073	CurOp = llvm::Constant::getNullValue(Ty: STy->getElementType(N: i));
1074	else
1075	CurOp = cast<llvm::Constant>(Val: constant->getAggregateElement(Elt: i));
1076	auto *NewOp = constWithPadding(CGM, isPattern, constant: CurOp);
1077	if (CurOp != NewOp)
1078	NestedIntact = false;
1079	Values.push_back(Elt: NewOp);
1080	SizeSoFar = CurOff + DL.getTypeAllocSize(Ty: CurOp->getType());
1081	}
1082	unsigned TotalSize = Layout->getSizeInBytes();
1083	if (SizeSoFar < TotalSize) {
1084	auto *PadTy = llvm::ArrayType::get(ElementType: Int8Ty, NumElements: TotalSize - SizeSoFar);
1085	Values.push_back(Elt: patternOrZeroFor(CGM, isPattern, Ty: PadTy));
1086	}
1087	if (NestedIntact && Values.size() == STy->getNumElements())
1088	return constant;
1089	return llvm::ConstantStruct::getAnon(V: Values, Packed: STy->isPacked());
1090	}
1091
1092	/// Replace all padding bytes in a given constant with either a pattern byte or
1093	/// 0x00.
1094	static llvm::Constant *constWithPadding(CodeGenModule &CGM, IsPattern isPattern,
1095	llvm::Constant *constant) {
1096	llvm::Type *OrigTy = constant->getType();
1097	if (const auto STy = dyn_cast<llvm::StructType>(Val: OrigTy))
1098	return constStructWithPadding(CGM, isPattern, STy, constant);
1099	if (auto *ArrayTy = dyn_cast<llvm::ArrayType>(Val: OrigTy)) {
1100	llvm::SmallVector<llvm::Constant *, 8> Values;
1101	uint64_t Size = ArrayTy->getNumElements();
1102	if (!Size)
1103	return constant;
1104	llvm::Type *ElemTy = ArrayTy->getElementType();
1105	bool ZeroInitializer = constant->isNullValue();
1106	llvm::Constant *OpValue, *PaddedOp;
1107	if (ZeroInitializer) {
1108	OpValue = llvm::Constant::getNullValue(Ty: ElemTy);
1109	PaddedOp = constWithPadding(CGM, isPattern, constant: OpValue);
1110	}
1111	for (unsigned Op = 0; Op != Size; ++Op) {
1112	if (!ZeroInitializer) {
1113	OpValue = constant->getAggregateElement(Elt: Op);
1114	PaddedOp = constWithPadding(CGM, isPattern, constant: OpValue);
1115	}
1116	Values.push_back(Elt: PaddedOp);
1117	}
1118	auto *NewElemTy = Values[0]->getType();
1119	if (NewElemTy == ElemTy)
1120	return constant;
1121	auto *NewArrayTy = llvm::ArrayType::get(ElementType: NewElemTy, NumElements: Size);
1122	return llvm::ConstantArray::get(T: NewArrayTy, V: Values);
1123	}
1124	// FIXME: Add handling for tail padding in vectors. Vectors don't
1125	// have padding between or inside elements, but the total amount of
1126	// data can be less than the allocated size.
1127	return constant;
1128	}
1129
1130	Address CodeGenModule::createUnnamedGlobalFrom(const VarDecl &D,
1131	llvm::Constant *Constant,
1132	CharUnits Align) {
1133	auto FunctionName = [&](const DeclContext *DC) -> std::string {
1134	if (const auto *FD = dyn_cast<FunctionDecl>(Val: DC)) {
1135	if (const auto *CC = dyn_cast<CXXConstructorDecl>(Val: FD))
1136	return CC->getNameAsString();
1137	if (const auto *CD = dyn_cast<CXXDestructorDecl>(Val: FD))
1138	return CD->getNameAsString();
1139	return std::string(getMangledName(GD: FD));
1140	} else if (const auto *OM = dyn_cast<ObjCMethodDecl>(Val: DC)) {
1141	return OM->getNameAsString();
1142	} else if (isa<BlockDecl>(Val: DC)) {
1143	return "<block>";
1144	} else if (isa<CapturedDecl>(Val: DC)) {
1145	return "<captured>";
1146	} else {
1147	llvm_unreachable("expected a function or method");
1148	}
1149	};
1150
1151	// Form a simple per-variable cache of these values in case we find we
1152	// want to reuse them.
1153	llvm::GlobalVariable *&CacheEntry = InitializerConstants[&D];
1154	if (!CacheEntry || CacheEntry->getInitializer() != Constant) {
1155	auto *Ty = Constant->getType();
1156	bool isConstant = true;
1157	llvm::GlobalVariable *InsertBefore = nullptr;
1158	unsigned AS =
1159	getContext().getTargetAddressSpace(AS: GetGlobalConstantAddressSpace());
1160	std::string Name;
1161	if (D.hasGlobalStorage())
1162	Name = getMangledName(GD: &D).str() + ".const";
1163	else if (const DeclContext *DC = D.getParentFunctionOrMethod())
1164	Name = ("__const." + FunctionName(DC) + "." + D.getName()).str();
1165	else
1166	llvm_unreachable("local variable has no parent function or method");
1167	llvm::GlobalVariable *GV = new llvm::GlobalVariable(
1168	getModule(), Ty, isConstant, llvm::GlobalValue::PrivateLinkage,
1169	Constant, Name, InsertBefore, llvm::GlobalValue::NotThreadLocal, AS);
1170	GV->setAlignment(Align.getAsAlign());
1171	GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1172	CacheEntry = GV;
1173	} else if (CacheEntry->getAlignment() < uint64_t(Align.getQuantity())) {
1174	CacheEntry->setAlignment(Align.getAsAlign());
1175	}
1176
1177	return Address(CacheEntry, CacheEntry->getValueType(), Align);
1178	}
1179
1180	static Address createUnnamedGlobalForMemcpyFrom(CodeGenModule &CGM,
1181	const VarDecl &D,
1182	CGBuilderTy &Builder,
1183	llvm::Constant *Constant,
1184	CharUnits Align) {
1185	Address SrcPtr = CGM.createUnnamedGlobalFrom(D, Constant, Align);
1186	return SrcPtr.withElementType(ElemTy: CGM.Int8Ty);
1187	}
1188
1189	static void emitStoresForConstant(CodeGenModule &CGM, const VarDecl &D,
1190	Address Loc, bool isVolatile,
1191	CGBuilderTy &Builder,
1192	llvm::Constant *constant, bool IsAutoInit) {
1193	auto *Ty = constant->getType();
1194	uint64_t ConstantSize = CGM.getDataLayout().getTypeAllocSize(Ty);
1195	if (!ConstantSize)
1196	return;
1197
1198	bool canDoSingleStore = Ty->isIntOrIntVectorTy() ||
1199	Ty->isPtrOrPtrVectorTy() || Ty->isFPOrFPVectorTy();
1200	if (canDoSingleStore) {
1201	auto *I = Builder.CreateStore(Val: constant, Addr: Loc, IsVolatile: isVolatile);
1202	if (IsAutoInit)
1203	I->addAnnotationMetadata(Annotation: "auto-init");
1204	return;
1205	}
1206
1207	auto *SizeVal = llvm::ConstantInt::get(Ty: CGM.IntPtrTy, V: ConstantSize);
1208
1209	// If the initializer is all or mostly the same, codegen with bzero / memset
1210	// then do a few stores afterward.
1211	if (shouldUseBZeroPlusStoresToInitialize(Init: constant, GlobalSize: ConstantSize)) {
1212	auto *I = Builder.CreateMemSet(Dest: Loc, Value: llvm::ConstantInt::get(Ty: CGM.Int8Ty, V: 0),
1213	Size: SizeVal, IsVolatile: isVolatile);
1214	if (IsAutoInit)
1215	I->addAnnotationMetadata(Annotation: "auto-init");
1216
1217	bool valueAlreadyCorrect =
1218	constant->isNullValue() || isa<llvm::UndefValue>(Val: constant);
1219	if (!valueAlreadyCorrect) {
1220	Loc = Loc.withElementType(ElemTy: Ty);
1221	emitStoresForInitAfterBZero(CGM, Init: constant, Loc, isVolatile, Builder,
1222	IsAutoInit);
1223	}
1224	return;
1225	}
1226
1227	// If the initializer is a repeated byte pattern, use memset.
1228	llvm::Value *Pattern =
1229	shouldUseMemSetToInitialize(Init: constant, GlobalSize: ConstantSize, DL: CGM.getDataLayout());
1230	if (Pattern) {
1231	uint64_t Value = 0x00;
1232	if (!isa<llvm::UndefValue>(Val: Pattern)) {
1233	const llvm::APInt &AP = cast<llvm::ConstantInt>(Val: Pattern)->getValue();
1234	assert(AP.getBitWidth() <= 8);
1235	Value = AP.getLimitedValue();
1236	}
1237	auto *I = Builder.CreateMemSet(
1238	Dest: Loc, Value: llvm::ConstantInt::get(Ty: CGM.Int8Ty, V: Value), Size: SizeVal, IsVolatile: isVolatile);
1239	if (IsAutoInit)
1240	I->addAnnotationMetadata(Annotation: "auto-init");
1241	return;
1242	}
1243
1244	// If the initializer is small, use a handful of stores.
1245	if (shouldSplitConstantStore(CGM, GlobalByteSize: ConstantSize)) {
1246	if (auto *STy = dyn_cast<llvm::StructType>(Val: Ty)) {
1247	const llvm::StructLayout *Layout =
1248	CGM.getDataLayout().getStructLayout(Ty: STy);
1249	for (unsigned i = 0; i != constant->getNumOperands(); i++) {
1250	CharUnits CurOff = CharUnits::fromQuantity(Quantity: Layout->getElementOffset(Idx: i));
1251	Address EltPtr = Builder.CreateConstInBoundsByteGEP(
1252	Addr: Loc.withElementType(ElemTy: CGM.Int8Ty), Offset: CurOff);
1253	emitStoresForConstant(CGM, D, Loc: EltPtr, isVolatile, Builder,
1254	constant: constant->getAggregateElement(Elt: i), IsAutoInit);
1255	}
1256	return;
1257	} else if (auto *ATy = dyn_cast<llvm::ArrayType>(Val: Ty)) {
1258	for (unsigned i = 0; i != ATy->getNumElements(); i++) {
1259	Address EltPtr = Builder.CreateConstGEP(
1260	Addr: Loc.withElementType(ElemTy: ATy->getElementType()), Index: i);
1261	emitStoresForConstant(CGM, D, Loc: EltPtr, isVolatile, Builder,
1262	constant: constant->getAggregateElement(Elt: i), IsAutoInit);
1263	}
1264	return;
1265	}
1266	}
1267
1268	// Copy from a global.
1269	auto *I =
1270	Builder.CreateMemCpy(Dest: Loc,
1271	Src: createUnnamedGlobalForMemcpyFrom(
1272	CGM, D, Builder, Constant: constant, Align: Loc.getAlignment()),
1273	Size: SizeVal, IsVolatile: isVolatile);
1274	if (IsAutoInit)
1275	I->addAnnotationMetadata(Annotation: "auto-init");
1276	}
1277
1278	static void emitStoresForZeroInit(CodeGenModule &CGM, const VarDecl &D,
1279	Address Loc, bool isVolatile,
1280	CGBuilderTy &Builder) {
1281	llvm::Type *ElTy = Loc.getElementType();
1282	llvm::Constant *constant =
1283	constWithPadding(CGM, isPattern: IsPattern::No, constant: llvm::Constant::getNullValue(Ty: ElTy));
1284	emitStoresForConstant(CGM, D, Loc, isVolatile, Builder, constant,
1285	/*IsAutoInit=*/true);
1286	}
1287
1288	static void emitStoresForPatternInit(CodeGenModule &CGM, const VarDecl &D,
1289	Address Loc, bool isVolatile,
1290	CGBuilderTy &Builder) {
1291	llvm::Type *ElTy = Loc.getElementType();
1292	llvm::Constant *constant = constWithPadding(
1293	CGM, isPattern: IsPattern::Yes, constant: initializationPatternFor(CGM, ElTy));
1294	assert(!isa<llvm::UndefValue>(constant));
1295	emitStoresForConstant(CGM, D, Loc, isVolatile, Builder, constant,
1296	/*IsAutoInit=*/true);
1297	}
1298
1299	static bool containsUndef(llvm::Constant *constant) {
1300	auto *Ty = constant->getType();
1301	if (isa<llvm::UndefValue>(Val: constant))
1302	return true;
1303	if (Ty->isStructTy() || Ty->isArrayTy() || Ty->isVectorTy())
1304	for (llvm::Use &Op : constant->operands())
1305	if (containsUndef(constant: cast<llvm::Constant>(Val&: Op)))
1306	return true;
1307	return false;
1308	}
1309
1310	static llvm::Constant *replaceUndef(CodeGenModule &CGM, IsPattern isPattern,
1311	llvm::Constant *constant) {
1312	auto *Ty = constant->getType();
1313	if (isa<llvm::UndefValue>(Val: constant))
1314	return patternOrZeroFor(CGM, isPattern, Ty);
1315	if (!(Ty->isStructTy() || Ty->isArrayTy() || Ty->isVectorTy()))
1316	return constant;
1317	if (!containsUndef(constant))
1318	return constant;
1319	llvm::SmallVector<llvm::Constant *, 8> Values(constant->getNumOperands());
1320	for (unsigned Op = 0, NumOp = constant->getNumOperands(); Op != NumOp; ++Op) {
1321	auto *OpValue = cast<llvm::Constant>(Val: constant->getOperand(i: Op));
1322	Values[Op] = replaceUndef(CGM, isPattern, constant: OpValue);
1323	}
1324	if (Ty->isStructTy())
1325	return llvm::ConstantStruct::get(T: cast<llvm::StructType>(Val: Ty), V: Values);
1326	if (Ty->isArrayTy())
1327	return llvm::ConstantArray::get(T: cast<llvm::ArrayType>(Val: Ty), V: Values);
1328	assert(Ty->isVectorTy());
1329	return llvm::ConstantVector::get(V: Values);
1330	}
1331
1332	/// EmitAutoVarDecl - Emit code and set up an entry in LocalDeclMap for a
1333	/// variable declaration with auto, register, or no storage class specifier.
1334	/// These turn into simple stack objects, or GlobalValues depending on target.
1335	void CodeGenFunction::EmitAutoVarDecl(const VarDecl &D) {
1336	AutoVarEmission emission = EmitAutoVarAlloca(var: D);
1337	EmitAutoVarInit(emission);
1338	EmitAutoVarCleanups(emission);
1339	}
1340
1341	/// Emit a lifetime.begin marker if some criteria are satisfied.
1342	/// \return a pointer to the temporary size Value if a marker was emitted, null
1343	/// otherwise
1344	llvm::Value *CodeGenFunction::EmitLifetimeStart(llvm::TypeSize Size,
1345	llvm::Value *Addr) {
1346	if (!ShouldEmitLifetimeMarkers)
1347	return nullptr;
1348
1349	assert(Addr->getType()->getPointerAddressSpace() ==
1350	CGM.getDataLayout().getAllocaAddrSpace() &&
1351	"Pointer should be in alloca address space");
1352	llvm::Value *SizeV = llvm::ConstantInt::get(
1353	Ty: Int64Ty, V: Size.isScalable() ? -1 : Size.getFixedValue());
1354	llvm::CallInst *C =
1355	Builder.CreateCall(Callee: CGM.getLLVMLifetimeStartFn(), Args: {SizeV, Addr});
1356	C->setDoesNotThrow();
1357	return SizeV;
1358	}
1359
1360	void CodeGenFunction::EmitLifetimeEnd(llvm::Value *Size, llvm::Value *Addr) {
1361	assert(Addr->getType()->getPointerAddressSpace() ==
1362	CGM.getDataLayout().getAllocaAddrSpace() &&
1363	"Pointer should be in alloca address space");
1364	llvm::CallInst *C =
1365	Builder.CreateCall(Callee: CGM.getLLVMLifetimeEndFn(), Args: {Size, Addr});
1366	C->setDoesNotThrow();
1367	}
1368
1369	void CodeGenFunction::EmitAndRegisterVariableArrayDimensions(
1370	CGDebugInfo *DI, const VarDecl &D, bool EmitDebugInfo) {
1371	// For each dimension stores its QualType and corresponding
1372	// size-expression Value.
1373	SmallVector<CodeGenFunction::VlaSizePair, 4> Dimensions;
1374	SmallVector<IdentifierInfo *, 4> VLAExprNames;
1375
1376	// Break down the array into individual dimensions.
1377	QualType Type1D = D.getType();
1378	while (getContext().getAsVariableArrayType(T: Type1D)) {
1379	auto VlaSize = getVLAElements1D(vla: Type1D);
1380	if (auto *C = dyn_cast<llvm::ConstantInt>(VlaSize.NumElts))
1381	Dimensions.emplace_back(C, Type1D.getUnqualifiedType());
1382	else {
1383	// Generate a locally unique name for the size expression.
1384	Twine Name = Twine("__vla_expr") + Twine(VLAExprCounter++);
1385	SmallString<12> Buffer;
1386	StringRef NameRef = Name.toStringRef(Out&: Buffer);
1387	auto &Ident = getContext().Idents.getOwn(Name: NameRef);
1388	VLAExprNames.push_back(Elt: &Ident);
1389	auto SizeExprAddr =
1390	CreateDefaultAlignTempAlloca(Ty: VlaSize.NumElts->getType(), Name: NameRef);
1391	Builder.CreateStore(Val: VlaSize.NumElts, Addr: SizeExprAddr);
1392	Dimensions.emplace_back(SizeExprAddr.getPointer(),
1393	Type1D.getUnqualifiedType());
1394	}
1395	Type1D = VlaSize.Type;
1396	}
1397
1398	if (!EmitDebugInfo)
1399	return;
1400
1401	// Register each dimension's size-expression with a DILocalVariable,
1402	// so that it can be used by CGDebugInfo when instantiating a DISubrange
1403	// to describe this array.
1404	unsigned NameIdx = 0;
1405	for (auto &VlaSize : Dimensions) {
1406	llvm::Metadata *MD;
1407	if (auto *C = dyn_cast<llvm::ConstantInt>(Val: VlaSize.NumElts))
1408	MD = llvm::ConstantAsMetadata::get(C);
1409	else {
1410	// Create an artificial VarDecl to generate debug info for.
1411	IdentifierInfo *NameIdent = VLAExprNames[NameIdx++];
1412	auto QT = getContext().getIntTypeForBitwidth(
1413	DestWidth: SizeTy->getScalarSizeInBits(), Signed: false);
1414	auto *ArtificialDecl = VarDecl::Create(
1415	C&: getContext(), DC: const_cast<DeclContext *>(D.getDeclContext()),
1416	StartLoc: D.getLocation(), IdLoc: D.getLocation(), Id: NameIdent, T: QT,
1417	TInfo: getContext().CreateTypeSourceInfo(T: QT), S: SC_Auto);
1418	ArtificialDecl->setImplicit();
1419
1420	MD = DI->EmitDeclareOfAutoVariable(Decl: ArtificialDecl, AI: VlaSize.NumElts,
1421	Builder);
1422	}
1423	assert(MD && "No Size expression debug node created");
1424	DI->registerVLASizeExpression(Ty: VlaSize.Type, SizeExpr: MD);
1425	}
1426	}
1427
1428	/// EmitAutoVarAlloca - Emit the alloca and debug information for a
1429	/// local variable. Does not emit initialization or destruction.
1430	CodeGenFunction::AutoVarEmission
1431	CodeGenFunction::EmitAutoVarAlloca(const VarDecl &D) {
1432	QualType Ty = D.getType();
1433	assert(
1434	Ty.getAddressSpace() == LangAS::Default ||
1435	(Ty.getAddressSpace() == LangAS::opencl_private && getLangOpts().OpenCL));
1436
1437	AutoVarEmission emission(D);
1438
1439	bool isEscapingByRef = D.isEscapingByref();
1440	emission.IsEscapingByRef = isEscapingByRef;
1441
1442	CharUnits alignment = getContext().getDeclAlign(&D);
1443
1444	// If the type is variably-modified, emit all the VLA sizes for it.
1445	if (Ty->isVariablyModifiedType())
1446	EmitVariablyModifiedType(Ty);
1447
1448	auto *DI = getDebugInfo();
1449	bool EmitDebugInfo = DI && CGM.getCodeGenOpts().hasReducedDebugInfo();
1450
1451	Address address = Address::invalid();
1452	Address AllocaAddr = Address::invalid();
1453	Address OpenMPLocalAddr = Address::invalid();
1454	if (CGM.getLangOpts().OpenMPIRBuilder)
1455	OpenMPLocalAddr = OMPBuilderCBHelpers::getAddressOfLocalVariable(CGF&: *this, VD: &D);
1456	else
1457	OpenMPLocalAddr =
1458	getLangOpts().OpenMP
1459	? CGM.getOpenMPRuntime().getAddressOfLocalVariable(CGF&: *this, VD: &D)
1460	: Address::invalid();
1461
1462	bool NRVO = getLangOpts().ElideConstructors && D.isNRVOVariable();
1463
1464	if (getLangOpts().OpenMP && OpenMPLocalAddr.isValid()) {
1465	address = OpenMPLocalAddr;
1466	AllocaAddr = OpenMPLocalAddr;
1467	} else if (Ty->isConstantSizeType()) {
1468	// If this value is an array or struct with a statically determinable
1469	// constant initializer, there are optimizations we can do.
1470	//
1471	// TODO: We should constant-evaluate the initializer of any variable,
1472	// as long as it is initialized by a constant expression. Currently,
1473	// isConstantInitializer produces wrong answers for structs with
1474	// reference or bitfield members, and a few other cases, and checking
1475	// for POD-ness protects us from some of these.
1476	if (D.getInit() && (Ty->isArrayType() || Ty->isRecordType()) &&
1477	(D.isConstexpr() ||
1478	((Ty.isPODType(Context: getContext()) ||
1479	getContext().getBaseElementType(QT: Ty)->isObjCObjectPointerType()) &&
1480	D.getInit()->isConstantInitializer(Ctx&: getContext(), ForRef: false)))) {
1481
1482	// If the variable's a const type, and it's neither an NRVO
1483	// candidate nor a __block variable and has no mutable members,
1484	// emit it as a global instead.
1485	// Exception is if a variable is located in non-constant address space
1486	// in OpenCL.
1487	bool NeedsDtor =
1488	D.needsDestruction(Ctx: getContext()) == QualType::DK_cxx_destructor;
1489	if ((!getLangOpts().OpenCL ||
1490	Ty.getAddressSpace() == LangAS::opencl_constant) &&
1491	(CGM.getCodeGenOpts().MergeAllConstants && !NRVO &&
1492	!isEscapingByRef &&
1493	Ty.isConstantStorage(Ctx: getContext(), ExcludeCtor: true, ExcludeDtor: !NeedsDtor))) {
1494	EmitStaticVarDecl(D, Linkage: llvm::GlobalValue::InternalLinkage);
1495
1496	// Signal this condition to later callbacks.
1497	emission.Addr = Address::invalid();
1498	assert(emission.wasEmittedAsGlobal());
1499	return emission;
1500	}
1501
1502	// Otherwise, tell the initialization code that we're in this case.
1503	emission.IsConstantAggregate = true;
1504	}
1505
1506	// A normal fixed sized variable becomes an alloca in the entry block,
1507	// unless:
1508	// - it's an NRVO variable.
1509	// - we are compiling OpenMP and it's an OpenMP local variable.
1510	if (NRVO) {
1511	// The named return value optimization: allocate this variable in the
1512	// return slot, so that we can elide the copy when returning this
1513	// variable (C++0x [class.copy]p34).
1514	address = ReturnValue;
1515	AllocaAddr = ReturnValue;
1516
1517	if (const RecordType *RecordTy = Ty->getAs<RecordType>()) {
1518	const auto *RD = RecordTy->getDecl();
1519	const auto *CXXRD = dyn_cast<CXXRecordDecl>(RD);
1520	if ((CXXRD && !CXXRD->hasTrivialDestructor()) ||
1521	RD->isNonTrivialToPrimitiveDestroy()) {
1522	// Create a flag that is used to indicate when the NRVO was applied
1523	// to this variable. Set it to zero to indicate that NRVO was not
1524	// applied.
1525	llvm::Value *Zero = Builder.getFalse();
1526	Address NRVOFlag =
1527	CreateTempAlloca(Ty: Zero->getType(), align: CharUnits::One(), Name: "nrvo");
1528	EnsureInsertPoint();
1529	Builder.CreateStore(Val: Zero, Addr: NRVOFlag);
1530
1531	// Record the NRVO flag for this variable.
1532	NRVOFlags[&D] = NRVOFlag.getPointer();
1533	emission.NRVOFlag = NRVOFlag.getPointer();
1534	}
1535	}
1536	} else {
1537	CharUnits allocaAlignment;
1538	llvm::Type *allocaTy;
1539	if (isEscapingByRef) {
1540	auto &byrefInfo = getBlockByrefInfo(var: &D);
1541	allocaTy = byrefInfo.Type;
1542	allocaAlignment = byrefInfo.ByrefAlignment;
1543	} else {
1544	allocaTy = ConvertTypeForMem(T: Ty);
1545	allocaAlignment = alignment;
1546	}
1547
1548	// Create the alloca. Note that we set the name separately from
1549	// building the instruction so that it's there even in no-asserts
1550	// builds.
1551	address = CreateTempAlloca(allocaTy, allocaAlignment, D.getName(),
1552	/*ArraySize=*/nullptr, &AllocaAddr);
1553
1554	// Don't emit lifetime markers for MSVC catch parameters. The lifetime of
1555	// the catch parameter starts in the catchpad instruction, and we can't
1556	// insert code in those basic blocks.
1557	bool IsMSCatchParam =
1558	D.isExceptionVariable() && getTarget().getCXXABI().isMicrosoft();
1559
1560	// Emit a lifetime intrinsic if meaningful. There's no point in doing this
1561	// if we don't have a valid insertion point (?).
1562	if (HaveInsertPoint() && !IsMSCatchParam) {
1563	// If there's a jump into the lifetime of this variable, its lifetime
1564	// gets broken up into several regions in IR, which requires more work
1565	// to handle correctly. For now, just omit the intrinsics; this is a
1566	// rare case, and it's better to just be conservatively correct.
1567	// PR28267.
1568	//
1569	// We have to do this in all language modes if there's a jump past the
1570	// declaration. We also have to do it in C if there's a jump to an
1571	// earlier point in the current block because non-VLA lifetimes begin as
1572	// soon as the containing block is entered, not when its variables
1573	// actually come into scope; suppressing the lifetime annotations
1574	// completely in this case is unnecessarily pessimistic, but again, this
1575	// is rare.
1576	if (!Bypasses.IsBypassed(D: &D) &&
1577	!(!getLangOpts().CPlusPlus && hasLabelBeenSeenInCurrentScope())) {
1578	llvm::TypeSize Size = CGM.getDataLayout().getTypeAllocSize(Ty: allocaTy);
1579	emission.SizeForLifetimeMarkers =
1580	EmitLifetimeStart(Size, Addr: AllocaAddr.getPointer());
1581	}
1582	} else {
1583	assert(!emission.useLifetimeMarkers());
1584	}
1585	}
1586	} else {
1587	EnsureInsertPoint();
1588
1589	// Delayed globalization for variable length declarations. This ensures that
1590	// the expression representing the length has been emitted and can be used
1591	// by the definition of the VLA. Since this is an escaped declaration, in
1592	// OpenMP we have to use a call to __kmpc_alloc_shared(). The matching
1593	// deallocation call to __kmpc_free_shared() is emitted later.
1594	bool VarAllocated = false;
1595	if (getLangOpts().OpenMPIsTargetDevice) {
1596	auto &RT = CGM.getOpenMPRuntime();
1597	if (RT.isDelayedVariableLengthDecl(CGF&: *this, VD: &D)) {
1598	// Emit call to __kmpc_alloc_shared() instead of the alloca.
1599	std::pair<llvm::Value *, llvm::Value *> AddrSizePair =
1600	RT.getKmpcAllocShared(CGF&: *this, VD: &D);
1601
1602	// Save the address of the allocation:
1603	LValue Base = MakeAddrLValue(AddrSizePair.first, D.getType(),
1604	CGM.getContext().getDeclAlign(&D),
1605	AlignmentSource::Decl);
1606	address = Base.getAddress(CGF&: *this);
1607
1608	// Push a cleanup block to emit the call to __kmpc_free_shared in the
1609	// appropriate location at the end of the scope of the
1610	// __kmpc_alloc_shared functions:
1611	pushKmpcAllocFree(Kind: NormalCleanup, AddrSizePair);
1612
1613	// Mark variable as allocated:
1614	VarAllocated = true;
1615	}
1616	}
1617
1618	if (!VarAllocated) {
1619	if (!DidCallStackSave) {
1620	// Save the stack.
1621	Address Stack =
1622	CreateDefaultAlignTempAlloca(Ty: AllocaInt8PtrTy, Name: "saved_stack");
1623
1624	llvm::Value *V = Builder.CreateStackSave();
1625	assert(V->getType() == AllocaInt8PtrTy);
1626	Builder.CreateStore(Val: V, Addr: Stack);
1627
1628	DidCallStackSave = true;
1629
1630	// Push a cleanup block and restore the stack there.
1631	// FIXME: in general circumstances, this should be an EH cleanup.
1632	pushStackRestore(kind: NormalCleanup, SPMem: Stack);
1633	}
1634
1635	auto VlaSize = getVLASize(vla: Ty);
1636	llvm::Type *llvmTy = ConvertTypeForMem(T: VlaSize.Type);
1637
1638	// Allocate memory for the array.
1639	address = CreateTempAlloca(llvmTy, alignment, "vla", VlaSize.NumElts,
1640	&AllocaAddr);
1641	}
1642
1643	// If we have debug info enabled, properly describe the VLA dimensions for
1644	// this type by registering the vla size expression for each of the
1645	// dimensions.
1646	EmitAndRegisterVariableArrayDimensions(DI, D, EmitDebugInfo);
1647	}
1648
1649	setAddrOfLocalVar(VD: &D, Addr: address);
1650	emission.Addr = address;
1651	emission.AllocaAddr = AllocaAddr;
1652
1653	// Emit debug info for local var declaration.
1654	if (EmitDebugInfo && HaveInsertPoint()) {
1655	Address DebugAddr = address;
1656	bool UsePointerValue = NRVO && ReturnValuePointer.isValid();
1657	DI->setLocation(D.getLocation());
1658
1659	// If NRVO, use a pointer to the return address.
1660	if (UsePointerValue) {
1661	DebugAddr = ReturnValuePointer;
1662	AllocaAddr = ReturnValuePointer;
1663	}
1664	(void)DI->EmitDeclareOfAutoVariable(Decl: &D, AI: AllocaAddr.getPointer(), Builder,
1665	UsePointerValue);
1666	}
1667
1668	if (D.hasAttr<AnnotateAttr>() && HaveInsertPoint())
1669	EmitVarAnnotations(D: &D, V: address.getPointer());
1670
1671	// Make sure we call @llvm.lifetime.end.
1672	if (emission.useLifetimeMarkers())
1673	EHStack.pushCleanup<CallLifetimeEnd>(Kind: NormalEHLifetimeMarker,
1674	A: emission.getOriginalAllocatedAddress(),
1675	A: emission.getSizeForLifetimeMarkers());
1676
1677	return emission;
1678	}
1679
1680	static bool isCapturedBy(const VarDecl &, const Expr *);
1681
1682	/// Determines whether the given __block variable is potentially
1683	/// captured by the given statement.
1684	static bool isCapturedBy(const VarDecl &Var, const Stmt *S) {
1685	if (const Expr *E = dyn_cast<Expr>(Val: S))
1686	return isCapturedBy(Var, E);
1687	for (const Stmt *SubStmt : S->children())
1688	if (isCapturedBy(Var, S: SubStmt))
1689	return true;
1690	return false;
1691	}
1692
1693	/// Determines whether the given __block variable is potentially
1694	/// captured by the given expression.
1695	static bool isCapturedBy(const VarDecl &Var, const Expr *E) {
1696	// Skip the most common kinds of expressions that make
1697	// hierarchy-walking expensive.
1698	E = E->IgnoreParenCasts();
1699
1700	if (const BlockExpr *BE = dyn_cast<BlockExpr>(Val: E)) {
1701	const BlockDecl *Block = BE->getBlockDecl();
1702	for (const auto &I : Block->captures()) {
1703	if (I.getVariable() == &Var)
1704	return true;
1705	}
1706
1707	// No need to walk into the subexpressions.
1708	return false;
1709	}
1710
1711	if (const StmtExpr *SE = dyn_cast<StmtExpr>(Val: E)) {
1712	const CompoundStmt *CS = SE->getSubStmt();
1713	for (const auto *BI : CS->body())
1714	if (const auto *BIE = dyn_cast<Expr>(Val: BI)) {
1715	if (isCapturedBy(Var, E: BIE))
1716	return true;
1717	}
1718	else if (const auto *DS = dyn_cast<DeclStmt>(Val: BI)) {
1719	// special case declarations
1720	for (const auto *I : DS->decls()) {
1721	if (const auto *VD = dyn_cast<VarDecl>(Val: (I))) {
1722	const Expr *Init = VD->getInit();
1723	if (Init && isCapturedBy(Var, E: Init))
1724	return true;
1725	}
1726	}
1727	}
1728	else
1729	// FIXME. Make safe assumption assuming arbitrary statements cause capturing.
1730	// Later, provide code to poke into statements for capture analysis.
1731	return true;
1732	return false;
1733	}
1734
1735	for (const Stmt *SubStmt : E->children())
1736	if (isCapturedBy(Var, SubStmt))
1737	return true;
1738
1739	return false;
1740	}
1741
1742	/// Determine whether the given initializer is trivial in the sense
1743	/// that it requires no code to be generated.
1744	bool CodeGenFunction::isTrivialInitializer(const Expr *Init) {
1745	if (!Init)
1746	return true;
1747
1748	if (const CXXConstructExpr *Construct = dyn_cast<CXXConstructExpr>(Val: Init))
1749	if (CXXConstructorDecl *Constructor = Construct->getConstructor())
1750	if (Constructor->isTrivial() &&
1751	Constructor->isDefaultConstructor() &&
1752	!Construct->requiresZeroInitialization())
1753	return true;
1754
1755	return false;
1756	}
1757
1758	void CodeGenFunction::emitZeroOrPatternForAutoVarInit(QualType type,
1759	const VarDecl &D,
1760	Address Loc) {
1761	auto trivialAutoVarInit = getContext().getLangOpts().getTrivialAutoVarInit();
1762	auto trivialAutoVarInitMaxSize =
1763	getContext().getLangOpts().TrivialAutoVarInitMaxSize;
1764	CharUnits Size = getContext().getTypeSizeInChars(T: type);
1765	bool isVolatile = type.isVolatileQualified();
1766	if (!Size.isZero()) {
1767	// We skip auto-init variables by their alloc size. Take this as an example:
1768	// "struct Foo {int x; char buff[1024];}" Assume the max-size flag is 1023.
1769	// All Foo type variables will be skipped. Ideally, we only skip the buff
1770	// array and still auto-init X in this example.
1771	// TODO: Improve the size filtering to by member size.
1772	auto allocSize = CGM.getDataLayout().getTypeAllocSize(Ty: Loc.getElementType());
1773	switch (trivialAutoVarInit) {
1774	case LangOptions::TrivialAutoVarInitKind::Uninitialized:
1775	llvm_unreachable("Uninitialized handled by caller");
1776	case LangOptions::TrivialAutoVarInitKind::Zero:
1777	if (CGM.stopAutoInit())
1778	return;
1779	if (trivialAutoVarInitMaxSize > 0 &&
1780	allocSize > trivialAutoVarInitMaxSize)
1781	return;
1782	emitStoresForZeroInit(CGM, D, Loc, isVolatile, Builder);
1783	break;
1784	case LangOptions::TrivialAutoVarInitKind::Pattern:
1785	if (CGM.stopAutoInit())
1786	return;
1787	if (trivialAutoVarInitMaxSize > 0 &&
1788	allocSize > trivialAutoVarInitMaxSize)
1789	return;
1790	emitStoresForPatternInit(CGM, D, Loc, isVolatile, Builder);
1791	break;
1792	}
1793	return;
1794	}
1795
1796	// VLAs look zero-sized to getTypeInfo. We can't emit constant stores to
1797	// them, so emit a memcpy with the VLA size to initialize each element.
1798	// Technically zero-sized or negative-sized VLAs are undefined, and UBSan
1799	// will catch that code, but there exists code which generates zero-sized
1800	// VLAs. Be nice and initialize whatever they requested.
1801	const auto *VlaType = getContext().getAsVariableArrayType(T: type);
1802	if (!VlaType)
1803	return;
1804	auto VlaSize = getVLASize(vla: VlaType);
1805	auto SizeVal = VlaSize.NumElts;
1806	CharUnits EltSize = getContext().getTypeSizeInChars(VlaSize.Type);
1807	switch (trivialAutoVarInit) {
1808	case LangOptions::TrivialAutoVarInitKind::Uninitialized:
1809	llvm_unreachable("Uninitialized handled by caller");
1810
1811	case LangOptions::TrivialAutoVarInitKind::Zero: {
1812	if (CGM.stopAutoInit())
1813	return;
1814	if (!EltSize.isOne())
1815	SizeVal = Builder.CreateNUWMul(LHS: SizeVal, RHS: CGM.getSize(numChars: EltSize));
1816	auto *I = Builder.CreateMemSet(Dest: Loc, Value: llvm::ConstantInt::get(Ty: Int8Ty, V: 0),
1817	Size: SizeVal, IsVolatile: isVolatile);
1818	I->addAnnotationMetadata(Annotation: "auto-init");
1819	break;
1820	}
1821
1822	case LangOptions::TrivialAutoVarInitKind::Pattern: {
1823	if (CGM.stopAutoInit())
1824	return;
1825	llvm::Type *ElTy = Loc.getElementType();
1826	llvm::Constant *Constant = constWithPadding(
1827	CGM, isPattern: IsPattern::Yes, constant: initializationPatternFor(CGM, ElTy));
1828	CharUnits ConstantAlign = getContext().getTypeAlignInChars(VlaSize.Type);
1829	llvm::BasicBlock *SetupBB = createBasicBlock(name: "vla-setup.loop");
1830	llvm::BasicBlock *LoopBB = createBasicBlock(name: "vla-init.loop");
1831	llvm::BasicBlock *ContBB = createBasicBlock(name: "vla-init.cont");
1832	llvm::Value *IsZeroSizedVLA = Builder.CreateICmpEQ(
1833	LHS: SizeVal, RHS: llvm::ConstantInt::get(Ty: SizeVal->getType(), V: 0),
1834	Name: "vla.iszerosized");
1835	Builder.CreateCondBr(Cond: IsZeroSizedVLA, True: ContBB, False: SetupBB);
1836	EmitBlock(BB: SetupBB);
1837	if (!EltSize.isOne())
1838	SizeVal = Builder.CreateNUWMul(LHS: SizeVal, RHS: CGM.getSize(numChars: EltSize));
1839	llvm::Value *BaseSizeInChars =
1840	llvm::ConstantInt::get(Ty: IntPtrTy, V: EltSize.getQuantity());
1841	Address Begin = Loc.withElementType(ElemTy: Int8Ty);
1842	llvm::Value *End = Builder.CreateInBoundsGEP(
1843	Ty: Begin.getElementType(), Ptr: Begin.getPointer(), IdxList: SizeVal, Name: "vla.end");
1844	llvm::BasicBlock *OriginBB = Builder.GetInsertBlock();
1845	EmitBlock(BB: LoopBB);
1846	llvm::PHINode *Cur = Builder.CreatePHI(Ty: Begin.getType(), NumReservedValues: 2, Name: "vla.cur");
1847	Cur->addIncoming(V: Begin.getPointer(), BB: OriginBB);
1848	CharUnits CurAlign = Loc.getAlignment().alignmentOfArrayElement(elementSize: EltSize);
1849	auto *I =
1850	Builder.CreateMemCpy(Dest: Address(Cur, Int8Ty, CurAlign),
1851	Src: createUnnamedGlobalForMemcpyFrom(
1852	CGM, D, Builder, Constant, Align: ConstantAlign),
1853	Size: BaseSizeInChars, IsVolatile: isVolatile);
1854	I->addAnnotationMetadata("auto-init");
1855	llvm::Value *Next =
1856	Builder.CreateInBoundsGEP(Ty: Int8Ty, Ptr: Cur, IdxList: BaseSizeInChars, Name: "vla.next");
1857	llvm::Value *Done = Builder.CreateICmpEQ(LHS: Next, RHS: End, Name: "vla-init.isdone");
1858	Builder.CreateCondBr(Cond: Done, True: ContBB, False: LoopBB);
1859	Cur->addIncoming(V: Next, BB: LoopBB);
1860	EmitBlock(BB: ContBB);
1861	} break;
1862	}
1863	}
1864
1865	void CodeGenFunction::EmitAutoVarInit(const AutoVarEmission &emission) {
1866	assert(emission.Variable && "emission was not valid!");
1867
1868	// If this was emitted as a global constant, we're done.
1869	if (emission.wasEmittedAsGlobal()) return;
1870
1871	const VarDecl &D = *emission.Variable;
1872	auto DL = ApplyDebugLocation::CreateDefaultArtificial(CGF&: *this, TemporaryLocation: D.getLocation());
1873	QualType type = D.getType();
1874
1875	// If this local has an initializer, emit it now.
1876	const Expr *Init = D.getInit();
1877
1878	// If we are at an unreachable point, we don't need to emit the initializer
1879	// unless it contains a label.
1880	if (!HaveInsertPoint()) {
1881	if (!Init || !ContainsLabel(Init)) return;
1882	EnsureInsertPoint();
1883	}
1884
1885	// Initialize the structure of a __block variable.
1886	if (emission.IsEscapingByRef)
1887	emitByrefStructureInit(emission);
1888
1889	// Initialize the variable here if it doesn't have a initializer and it is a
1890	// C struct that is non-trivial to initialize or an array containing such a
1891	// struct.
1892	if (!Init &&
1893	type.isNonTrivialToPrimitiveDefaultInitialize() ==
1894	QualType::PDIK_Struct) {
1895	LValue Dst = MakeAddrLValue(Addr: emission.getAllocatedAddress(), T: type);
1896	if (emission.IsEscapingByRef)
1897	drillIntoBlockVariable(CGF&: *this, lvalue&: Dst, var: &D);
1898	defaultInitNonTrivialCStructVar(Dst);
1899	return;
1900	}
1901
1902	// Check whether this is a byref variable that's potentially
1903	// captured and moved by its own initializer. If so, we'll need to
1904	// emit the initializer first, then copy into the variable.
1905	bool capturedByInit =
1906	Init && emission.IsEscapingByRef && isCapturedBy(Var: D, E: Init);
1907
1908	bool locIsByrefHeader = !capturedByInit;
1909	const Address Loc =
1910	locIsByrefHeader ? emission.getObjectAddress(CGF&: *this) : emission.Addr;
1911
1912	// Note: constexpr already initializes everything correctly.
1913	LangOptions::TrivialAutoVarInitKind trivialAutoVarInit =
1914	(D.isConstexpr()
1915	? LangOptions::TrivialAutoVarInitKind::Uninitialized
1916	: (D.getAttr<UninitializedAttr>()
1917	? LangOptions::TrivialAutoVarInitKind::Uninitialized
1918	: getContext().getLangOpts().getTrivialAutoVarInit()));
1919
1920	auto initializeWhatIsTechnicallyUninitialized = [&](Address Loc) {
1921	if (trivialAutoVarInit ==
1922	LangOptions::TrivialAutoVarInitKind::Uninitialized)
1923	return;
1924
1925	// Only initialize a __block's storage: we always initialize the header.
1926	if (emission.IsEscapingByRef && !locIsByrefHeader)
1927	Loc = emitBlockByrefAddress(baseAddr: Loc, V: &D, /*follow=*/followForward: false);
1928
1929	return emitZeroOrPatternForAutoVarInit(type, D, Loc);
1930	};
1931
1932	if (isTrivialInitializer(Init))
1933	return initializeWhatIsTechnicallyUninitialized(Loc);
1934
1935	llvm::Constant *constant = nullptr;
1936	if (emission.IsConstantAggregate ||
1937	D.mightBeUsableInConstantExpressions(C: getContext())) {
1938	assert(!capturedByInit && "constant init contains a capturing block?");
1939	constant = ConstantEmitter(*this).tryEmitAbstractForInitializer(D);
1940	if (constant && !constant->isZeroValue() &&
1941	(trivialAutoVarInit !=
1942	LangOptions::TrivialAutoVarInitKind::Uninitialized)) {
1943	IsPattern isPattern =
1944	(trivialAutoVarInit == LangOptions::TrivialAutoVarInitKind::Pattern)
1945	? IsPattern::Yes
1946	: IsPattern::No;
1947	// C guarantees that brace-init with fewer initializers than members in
1948	// the aggregate will initialize the rest of the aggregate as-if it were
1949	// static initialization. In turn static initialization guarantees that
1950	// padding is initialized to zero bits. We could instead pattern-init if D
1951	// has any ImplicitValueInitExpr, but that seems to be unintuitive
1952	// behavior.
1953	constant = constWithPadding(CGM, isPattern: IsPattern::No,
1954	constant: replaceUndef(CGM, isPattern, constant));
1955	}
1956	}
1957
1958	if (!constant) {
1959	initializeWhatIsTechnicallyUninitialized(Loc);
1960	LValue lv = MakeAddrLValue(Addr: Loc, T: type);
1961	lv.setNonGC(true);
1962	return EmitExprAsInit(Init, &D, lv, capturedByInit);
1963	}
1964
1965	if (!emission.IsConstantAggregate) {
1966	// For simple scalar/complex initialization, store the value directly.
1967	LValue lv = MakeAddrLValue(Addr: Loc, T: type);
1968	lv.setNonGC(true);
1969	return EmitStoreThroughLValue(Src: RValue::get(V: constant), Dst: lv, isInit: true);
1970	}
1971
1972	emitStoresForConstant(CGM, D, Loc: Loc.withElementType(ElemTy: CGM.Int8Ty),
1973	isVolatile: type.isVolatileQualified(), Builder, constant,
1974	/*IsAutoInit=*/false);
1975	}
1976
1977	/// Emit an expression as an initializer for an object (variable, field, etc.)
1978	/// at the given location. The expression is not necessarily the normal
1979	/// initializer for the object, and the address is not necessarily
1980	/// its normal location.
1981	///
1982	/// \param init the initializing expression
1983	/// \param D the object to act as if we're initializing
1984	/// \param lvalue the lvalue to initialize
1985	/// \param capturedByInit true if \p D is a __block variable
1986	/// whose address is potentially changed by the initializer
1987	void CodeGenFunction::EmitExprAsInit(const Expr *init, const ValueDecl *D,
1988	LValue lvalue, bool capturedByInit) {
1989	QualType type = D->getType();
1990
1991	if (type->isReferenceType()) {
1992	RValue rvalue = EmitReferenceBindingToExpr(E: init);
1993	if (capturedByInit)
1994	drillIntoBlockVariable(CGF&: *this, lvalue, var: cast<VarDecl>(Val: D));
1995	EmitStoreThroughLValue(Src: rvalue, Dst: lvalue, isInit: true);
1996	return;
1997	}
1998	switch (getEvaluationKind(T: type)) {
1999	case TEK_Scalar:
2000	EmitScalarInit(init, D, lvalue, capturedByInit);
2001	return;
2002	case TEK_Complex: {
2003	ComplexPairTy complex = EmitComplexExpr(E: init);
2004	if (capturedByInit)
2005	drillIntoBlockVariable(CGF&: *this, lvalue, var: cast<VarDecl>(Val: D));
2006	EmitStoreOfComplex(V: complex, dest: lvalue, /*init*/ isInit: true);
2007	return;
2008	}
2009	case TEK_Aggregate:
2010	if (type->isAtomicType()) {
2011	EmitAtomicInit(E: const_cast<Expr*>(init), lvalue);
2012	} else {
2013	AggValueSlot::Overlap_t Overlap = AggValueSlot::MayOverlap;
2014	if (isa<VarDecl>(Val: D))
2015	Overlap = AggValueSlot::DoesNotOverlap;
2016	else if (auto *FD = dyn_cast<FieldDecl>(Val: D))
2017	Overlap = getOverlapForFieldInit(FD);
2018	// TODO: how can we delay here if D is captured by its initializer?
2019	EmitAggExpr(E: init, AS: AggValueSlot::forLValue(
2020	LV: lvalue, CGF&: *this, isDestructed: AggValueSlot::IsDestructed,
2021	needsGC: AggValueSlot::DoesNotNeedGCBarriers,
2022	isAliased: AggValueSlot::IsNotAliased, mayOverlap: Overlap));
2023	}
2024	return;
2025	}
2026	llvm_unreachable("bad evaluation kind");
2027	}
2028
2029	/// Enter a destroy cleanup for the given local variable.
2030	void CodeGenFunction::emitAutoVarTypeCleanup(
2031	const CodeGenFunction::AutoVarEmission &emission,
2032	QualType::DestructionKind dtorKind) {
2033	assert(dtorKind != QualType::DK_none);
2034
2035	// Note that for __block variables, we want to destroy the
2036	// original stack object, not the possibly forwarded object.
2037	Address addr = emission.getObjectAddress(CGF&: *this);
2038
2039	const VarDecl *var = emission.Variable;
2040	QualType type = var->getType();
2041
2042	CleanupKind cleanupKind = NormalAndEHCleanup;
2043	CodeGenFunction::Destroyer *destroyer = nullptr;
2044
2045	switch (dtorKind) {
2046	case QualType::DK_none:
2047	llvm_unreachable("no cleanup for trivially-destructible variable");
2048
2049	case QualType::DK_cxx_destructor:
2050	// If there's an NRVO flag on the emission, we need a different
2051	// cleanup.
2052	if (emission.NRVOFlag) {
2053	assert(!type->isArrayType());
2054	CXXDestructorDecl *dtor = type->getAsCXXRecordDecl()->getDestructor();
2055	EHStack.pushCleanup<DestroyNRVOVariableCXX>(Kind: cleanupKind, A: addr, A: type, A: dtor,
2056	A: emission.NRVOFlag);
2057	return;
2058	}
2059	break;
2060
2061	case QualType::DK_objc_strong_lifetime:
2062	// Suppress cleanups for pseudo-strong variables.
2063	if (var->isARCPseudoStrong()) return;
2064
2065	// Otherwise, consider whether to use an EH cleanup or not.
2066	cleanupKind = getARCCleanupKind();
2067
2068	// Use the imprecise destroyer by default.
2069	if (!var->hasAttr<ObjCPreciseLifetimeAttr>())
2070	destroyer = CodeGenFunction::destroyARCStrongImprecise;
2071	break;
2072
2073	case QualType::DK_objc_weak_lifetime:
2074	break;
2075
2076	case QualType::DK_nontrivial_c_struct:
2077	destroyer = CodeGenFunction::destroyNonTrivialCStruct;
2078	if (emission.NRVOFlag) {
2079	assert(!type->isArrayType());
2080	EHStack.pushCleanup<DestroyNRVOVariableC>(Kind: cleanupKind, A: addr,
2081	A: emission.NRVOFlag, A: type);
2082	return;
2083	}
2084	break;
2085	}
2086
2087	// If we haven't chosen a more specific destroyer, use the default.
2088	if (!destroyer) destroyer = getDestroyer(destructionKind: dtorKind);
2089
2090	// Use an EH cleanup in array destructors iff the destructor itself
2091	// is being pushed as an EH cleanup.
2092	bool useEHCleanup = (cleanupKind & EHCleanup);
2093	EHStack.pushCleanup<DestroyObject>(Kind: cleanupKind, A: addr, A: type, A: destroyer,
2094	A: useEHCleanup);
2095	}
2096
2097	void CodeGenFunction::EmitAutoVarCleanups(const AutoVarEmission &emission) {
2098	assert(emission.Variable && "emission was not valid!");
2099
2100	// If this was emitted as a global constant, we're done.
2101	if (emission.wasEmittedAsGlobal()) return;
2102
2103	// If we don't have an insertion point, we're done. Sema prevents
2104	// us from jumping into any of these scopes anyway.
2105	if (!HaveInsertPoint()) return;
2106
2107	const VarDecl &D = *emission.Variable;
2108
2109	// Check the type for a cleanup.
2110	if (QualType::DestructionKind dtorKind = D.needsDestruction(Ctx: getContext()))
2111	emitAutoVarTypeCleanup(emission, dtorKind);
2112
2113	// In GC mode, honor objc_precise_lifetime.
2114	if (getLangOpts().getGC() != LangOptions::NonGC &&
2115	D.hasAttr<ObjCPreciseLifetimeAttr>()) {
2116	EHStack.pushCleanup<ExtendGCLifetime>(Kind: NormalCleanup, A: &D);
2117	}
2118
2119	// Handle the cleanup attribute.
2120	if (const CleanupAttr *CA = D.getAttr<CleanupAttr>()) {
2121	const FunctionDecl *FD = CA->getFunctionDecl();
2122
2123	llvm::Constant *F = CGM.GetAddrOfFunction(GD: FD);
2124	assert(F && "Could not find function!");
2125
2126	const CGFunctionInfo &Info = CGM.getTypes().arrangeFunctionDeclaration(FD);
2127	EHStack.pushCleanup<CallCleanupFunction>(Kind: NormalAndEHCleanup, A: F, A: &Info, A: &D);
2128	}
2129
2130	// If this is a block variable, call _Block_object_destroy
2131	// (on the unforwarded address). Don't enter this cleanup if we're in pure-GC
2132	// mode.
2133	if (emission.IsEscapingByRef &&
2134	CGM.getLangOpts().getGC() != LangOptions::GCOnly) {
2135	BlockFieldFlags Flags = BLOCK_FIELD_IS_BYREF;
2136	if (emission.Variable->getType().isObjCGCWeak())
2137	Flags |= BLOCK_FIELD_IS_WEAK;
2138	enterByrefCleanup(Kind: NormalAndEHCleanup, Addr: emission.Addr, Flags,
2139	/*LoadBlockVarAddr*/ false,
2140	CanThrow: cxxDestructorCanThrow(T: emission.Variable->getType()));
2141	}
2142	}
2143
2144	CodeGenFunction::Destroyer *
2145	CodeGenFunction::getDestroyer(QualType::DestructionKind kind) {
2146	switch (kind) {
2147	case QualType::DK_none: llvm_unreachable("no destroyer for trivial dtor");
2148	case QualType::DK_cxx_destructor:
2149	return destroyCXXObject;
2150	case QualType::DK_objc_strong_lifetime:
2151	return destroyARCStrongPrecise;
2152	case QualType::DK_objc_weak_lifetime:
2153	return destroyARCWeak;
2154	case QualType::DK_nontrivial_c_struct:
2155	return destroyNonTrivialCStruct;
2156	}
2157	llvm_unreachable("Unknown DestructionKind");
2158	}
2159
2160	/// pushEHDestroy - Push the standard destructor for the given type as
2161	/// an EH-only cleanup.
2162	void CodeGenFunction::pushEHDestroy(QualType::DestructionKind dtorKind,
2163	Address addr, QualType type) {
2164	assert(dtorKind && "cannot push destructor for trivial type");
2165	assert(needsEHCleanup(dtorKind));
2166
2167	pushDestroy(kind: EHCleanup, addr, type, destroyer: getDestroyer(kind: dtorKind), useEHCleanupForArray: true);
2168	}
2169
2170	/// pushDestroy - Push the standard destructor for the given type as
2171	/// at least a normal cleanup.
2172	void CodeGenFunction::pushDestroy(QualType::DestructionKind dtorKind,
2173	Address addr, QualType type) {
2174	assert(dtorKind && "cannot push destructor for trivial type");
2175
2176	CleanupKind cleanupKind = getCleanupKind(kind: dtorKind);
2177	pushDestroy(kind: cleanupKind, addr, type, destroyer: getDestroyer(kind: dtorKind),
2178	useEHCleanupForArray: cleanupKind & EHCleanup);
2179	}
2180
2181	void CodeGenFunction::pushDestroy(CleanupKind cleanupKind, Address addr,
2182	QualType type, Destroyer *destroyer,
2183	bool useEHCleanupForArray) {
2184	pushFullExprCleanup<DestroyObject>(kind: cleanupKind, A: addr, A: type,
2185	A: destroyer, A: useEHCleanupForArray);
2186	}
2187
2188	void CodeGenFunction::pushStackRestore(CleanupKind Kind, Address SPMem) {
2189	EHStack.pushCleanup<CallStackRestore>(Kind, A: SPMem);
2190	}
2191
2192	void CodeGenFunction::pushKmpcAllocFree(
2193	CleanupKind Kind, std::pair<llvm::Value *, llvm::Value *> AddrSizePair) {
2194	EHStack.pushCleanup<KmpcAllocFree>(Kind, A: AddrSizePair);
2195	}
2196
2197	void CodeGenFunction::pushLifetimeExtendedDestroy(CleanupKind cleanupKind,
2198	Address addr, QualType type,
2199	Destroyer *destroyer,
2200	bool useEHCleanupForArray) {
2201	// If we're not in a conditional branch, we don't need to bother generating a
2202	// conditional cleanup.
2203	if (!isInConditionalBranch()) {
2204	// Push an EH-only cleanup for the object now.
2205	// FIXME: When popping normal cleanups, we need to keep this EH cleanup
2206	// around in case a temporary's destructor throws an exception.
2207	if (cleanupKind & EHCleanup)
2208	EHStack.pushCleanup<DestroyObject>(
2209	Kind: static_cast<CleanupKind>(cleanupKind & ~NormalCleanup), A: addr, A: type,
2210	A: destroyer, A: useEHCleanupForArray);
2211
2212	return pushCleanupAfterFullExprWithActiveFlag<DestroyObject>(
2213	Kind: cleanupKind, ActiveFlag: Address::invalid(), A: addr, A: type, A: destroyer, A: useEHCleanupForArray);
2214	}
2215
2216	// Otherwise, we should only destroy the object if it's been initialized.
2217	// Re-use the active flag and saved address across both the EH and end of
2218	// scope cleanups.
2219
2220	using SavedType = typename DominatingValue<Address>::saved_type;
2221	using ConditionalCleanupType =
2222	EHScopeStack::ConditionalCleanup<DestroyObject, Address, QualType,
2223	Destroyer *, bool>;
2224
2225	Address ActiveFlag = createCleanupActiveFlag();
2226	SavedType SavedAddr = saveValueInCond(value: addr);
2227
2228	if (cleanupKind & EHCleanup) {
2229	EHStack.pushCleanup<ConditionalCleanupType>(
2230	Kind: static_cast<CleanupKind>(cleanupKind & ~NormalCleanup), A: SavedAddr, A: type,
2231	A: destroyer, A: useEHCleanupForArray);
2232	initFullExprCleanupWithFlag(ActiveFlag);
2233	}
2234
2235	pushCleanupAfterFullExprWithActiveFlag<ConditionalCleanupType>(
2236	Kind: cleanupKind, ActiveFlag, A: SavedAddr, A: type, A: destroyer,
2237	A: useEHCleanupForArray);
2238	}
2239
2240	/// emitDestroy - Immediately perform the destruction of the given
2241	/// object.
2242	///
2243	/// \param addr - the address of the object; a type*
2244	/// \param type - the type of the object; if an array type, all
2245	/// objects are destroyed in reverse order
2246	/// \param destroyer - the function to call to destroy individual
2247	/// elements
2248	/// \param useEHCleanupForArray - whether an EH cleanup should be
2249	/// used when destroying array elements, in case one of the
2250	/// destructions throws an exception
2251	void CodeGenFunction::emitDestroy(Address addr, QualType type,
2252	Destroyer *destroyer,
2253	bool useEHCleanupForArray) {
2254	const ArrayType *arrayType = getContext().getAsArrayType(T: type);
2255	if (!arrayType)
2256	return destroyer(*this, addr, type);
2257
2258	llvm::Value *length = emitArrayLength(arrayType, baseType&: type, addr);
2259
2260	CharUnits elementAlign =
2261	addr.getAlignment()
2262	.alignmentOfArrayElement(elementSize: getContext().getTypeSizeInChars(T: type));
2263
2264	// Normally we have to check whether the array is zero-length.
2265	bool checkZeroLength = true;
2266
2267	// But if the array length is constant, we can suppress that.
2268	if (llvm::ConstantInt *constLength = dyn_cast<llvm::ConstantInt>(Val: length)) {
2269	// ...and if it's constant zero, we can just skip the entire thing.
2270	if (constLength->isZero()) return;
2271	checkZeroLength = false;
2272	}
2273
2274	llvm::Value *begin = addr.getPointer();
2275	llvm::Value *end =
2276	Builder.CreateInBoundsGEP(Ty: addr.getElementType(), Ptr: begin, IdxList: length);
2277	emitArrayDestroy(begin, end, elementType: type, elementAlign, destroyer,
2278	checkZeroLength, useEHCleanup: useEHCleanupForArray);
2279	}
2280
2281	/// emitArrayDestroy - Destroys all the elements of the given array,
2282	/// beginning from last to first. The array cannot be zero-length.
2283	///
2284	/// \param begin - a type* denoting the first element of the array
2285	/// \param end - a type* denoting one past the end of the array
2286	/// \param elementType - the element type of the array
2287	/// \param destroyer - the function to call to destroy elements
2288	/// \param useEHCleanup - whether to push an EH cleanup to destroy
2289	/// the remaining elements in case the destruction of a single
2290	/// element throws
2291	void CodeGenFunction::emitArrayDestroy(llvm::Value *begin,
2292	llvm::Value *end,
2293	QualType elementType,
2294	CharUnits elementAlign,
2295	Destroyer *destroyer,
2296	bool checkZeroLength,
2297	bool useEHCleanup) {
2298	assert(!elementType->isArrayType());
2299
2300	// The basic structure here is a do-while loop, because we don't
2301	// need to check for the zero-element case.
2302	llvm::BasicBlock *bodyBB = createBasicBlock(name: "arraydestroy.body");
2303	llvm::BasicBlock *doneBB = createBasicBlock(name: "arraydestroy.done");
2304
2305	if (checkZeroLength) {
2306	llvm::Value *isEmpty = Builder.CreateICmpEQ(LHS: begin, RHS: end,
2307	Name: "arraydestroy.isempty");
2308	Builder.CreateCondBr(Cond: isEmpty, True: doneBB, False: bodyBB);
2309	}
2310
2311	// Enter the loop body, making that address the current address.
2312	llvm::BasicBlock *entryBB = Builder.GetInsertBlock();
2313	EmitBlock(BB: bodyBB);
2314	llvm::PHINode *elementPast =
2315	Builder.CreatePHI(Ty: begin->getType(), NumReservedValues: 2, Name: "arraydestroy.elementPast");
2316	elementPast->addIncoming(V: end, BB: entryBB);
2317
2318	// Shift the address back by one element.
2319	llvm::Value *negativeOne = llvm::ConstantInt::get(Ty: SizeTy, V: -1, IsSigned: true);
2320	llvm::Type *llvmElementType = ConvertTypeForMem(T: elementType);
2321	llvm::Value *element = Builder.CreateInBoundsGEP(
2322	Ty: llvmElementType, Ptr: elementPast, IdxList: negativeOne, Name: "arraydestroy.element");
2323
2324	if (useEHCleanup)
2325	pushRegularPartialArrayCleanup(arrayBegin: begin, arrayEnd: element, elementType, elementAlignment: elementAlign,
2326	destroyer);
2327
2328	// Perform the actual destruction there.
2329	destroyer(*this, Address(element, llvmElementType, elementAlign),
2330	elementType);
2331
2332	if (useEHCleanup)
2333	PopCleanupBlock();
2334
2335	// Check whether we've reached the end.
2336	llvm::Value *done = Builder.CreateICmpEQ(LHS: element, RHS: begin, Name: "arraydestroy.done");
2337	Builder.CreateCondBr(Cond: done, True: doneBB, False: bodyBB);
2338	elementPast->addIncoming(V: element, BB: Builder.GetInsertBlock());
2339
2340	// Done.
2341	EmitBlock(BB: doneBB);
2342	}
2343
2344	/// Perform partial array destruction as if in an EH cleanup. Unlike
2345	/// emitArrayDestroy, the element type here may still be an array type.
2346	static void emitPartialArrayDestroy(CodeGenFunction &CGF,
2347	llvm::Value *begin, llvm::Value *end,
2348	QualType type, CharUnits elementAlign,
2349	CodeGenFunction::Destroyer *destroyer) {
2350	llvm::Type *elemTy = CGF.ConvertTypeForMem(T: type);
2351
2352	// If the element type is itself an array, drill down.
2353	unsigned arrayDepth = 0;
2354	while (const ArrayType *arrayType = CGF.getContext().getAsArrayType(T: type)) {
2355	// VLAs don't require a GEP index to walk into.
2356	if (!isa<VariableArrayType>(Val: arrayType))
2357	arrayDepth++;
2358	type = arrayType->getElementType();
2359	}
2360
2361	if (arrayDepth) {
2362	llvm::Value *zero = llvm::ConstantInt::get(Ty: CGF.SizeTy, V: 0);
2363
2364	SmallVector<llvm::Value*,4> gepIndices(arrayDepth+1, zero);
2365	begin = CGF.Builder.CreateInBoundsGEP(
2366	Ty: elemTy, Ptr: begin, IdxList: gepIndices, Name: "pad.arraybegin");
2367	end = CGF.Builder.CreateInBoundsGEP(
2368	Ty: elemTy, Ptr: end, IdxList: gepIndices, Name: "pad.arrayend");
2369	}
2370
2371	// Destroy the array. We don't ever need an EH cleanup because we
2372	// assume that we're in an EH cleanup ourselves, so a throwing
2373	// destructor causes an immediate terminate.
2374	CGF.emitArrayDestroy(begin, end, elementType: type, elementAlign, destroyer,
2375	/*checkZeroLength*/ true, /*useEHCleanup*/ false);
2376	}
2377
2378	namespace {
2379	/// RegularPartialArrayDestroy - a cleanup which performs a partial
2380	/// array destroy where the end pointer is regularly determined and
2381	/// does not need to be loaded from a local.
2382	class RegularPartialArrayDestroy final : public EHScopeStack::Cleanup {
2383	llvm::Value *ArrayBegin;
2384	llvm::Value *ArrayEnd;
2385	QualType ElementType;
2386	CodeGenFunction::Destroyer *Destroyer;
2387	CharUnits ElementAlign;
2388	public:
2389	RegularPartialArrayDestroy(llvm::Value *arrayBegin, llvm::Value *arrayEnd,
2390	QualType elementType, CharUnits elementAlign,
2391	CodeGenFunction::Destroyer *destroyer)
2392	: ArrayBegin(arrayBegin), ArrayEnd(arrayEnd),
2393	ElementType(elementType), Destroyer(destroyer),
2394	ElementAlign(elementAlign) {}
2395
2396	void Emit(CodeGenFunction &CGF, Flags flags) override {
2397	emitPartialArrayDestroy(CGF, ArrayBegin, ArrayEnd,
2398	ElementType, ElementAlign, Destroyer);
2399	}
2400	};
2401
2402	/// IrregularPartialArrayDestroy - a cleanup which performs a
2403	/// partial array destroy where the end pointer is irregularly
2404	/// determined and must be loaded from a local.
2405	class IrregularPartialArrayDestroy final : public EHScopeStack::Cleanup {
2406	llvm::Value *ArrayBegin;
2407	Address ArrayEndPointer;
2408	QualType ElementType;
2409	CodeGenFunction::Destroyer *Destroyer;
2410	CharUnits ElementAlign;
2411	public:
2412	IrregularPartialArrayDestroy(llvm::Value *arrayBegin,
2413	Address arrayEndPointer,
2414	QualType elementType,
2415	CharUnits elementAlign,
2416	CodeGenFunction::Destroyer *destroyer)
2417	: ArrayBegin(arrayBegin), ArrayEndPointer(arrayEndPointer),
2418	ElementType(elementType), Destroyer(destroyer),
2419	ElementAlign(elementAlign) {}
2420
2421	void Emit(CodeGenFunction &CGF, Flags flags) override {
2422	llvm::Value *arrayEnd = CGF.Builder.CreateLoad(Addr: ArrayEndPointer);
2423	emitPartialArrayDestroy(CGF, ArrayBegin, arrayEnd,
2424	ElementType, ElementAlign, Destroyer);
2425	}
2426	};
2427	} // end anonymous namespace
2428
2429	/// pushIrregularPartialArrayCleanup - Push an EH cleanup to destroy
2430	/// already-constructed elements of the given array. The cleanup
2431	/// may be popped with DeactivateCleanupBlock or PopCleanupBlock.
2432	///
2433	/// \param elementType - the immediate element type of the array;
2434	/// possibly still an array type
2435	void CodeGenFunction::pushIrregularPartialArrayCleanup(llvm::Value *arrayBegin,
2436	Address arrayEndPointer,
2437	QualType elementType,
2438	CharUnits elementAlign,
2439	Destroyer *destroyer) {
2440	pushFullExprCleanup<IrregularPartialArrayDestroy>(kind: EHCleanup,
2441	A: arrayBegin, A: arrayEndPointer,
2442	A: elementType, A: elementAlign,
2443	A: destroyer);
2444	}
2445
2446	/// pushRegularPartialArrayCleanup - Push an EH cleanup to destroy
2447	/// already-constructed elements of the given array. The cleanup
2448	/// may be popped with DeactivateCleanupBlock or PopCleanupBlock.
2449	///
2450	/// \param elementType - the immediate element type of the array;
2451	/// possibly still an array type
2452	void CodeGenFunction::pushRegularPartialArrayCleanup(llvm::Value *arrayBegin,
2453	llvm::Value *arrayEnd,
2454	QualType elementType,
2455	CharUnits elementAlign,
2456	Destroyer *destroyer) {
2457	pushFullExprCleanup<RegularPartialArrayDestroy>(kind: EHCleanup,
2458	A: arrayBegin, A: arrayEnd,
2459	A: elementType, A: elementAlign,
2460	A: destroyer);
2461	}
2462
2463	/// Lazily declare the @llvm.lifetime.start intrinsic.
2464	llvm::Function *CodeGenModule::getLLVMLifetimeStartFn() {
2465	if (LifetimeStartFn)
2466	return LifetimeStartFn;
2467	LifetimeStartFn = llvm::Intrinsic::getDeclaration(&getModule(),
2468	llvm::Intrinsic::lifetime_start, AllocaInt8PtrTy);
2469	return LifetimeStartFn;
2470	}
2471
2472	/// Lazily declare the @llvm.lifetime.end intrinsic.
2473	llvm::Function *CodeGenModule::getLLVMLifetimeEndFn() {
2474	if (LifetimeEndFn)
2475	return LifetimeEndFn;
2476	LifetimeEndFn = llvm::Intrinsic::getDeclaration(&getModule(),
2477	llvm::Intrinsic::lifetime_end, AllocaInt8PtrTy);
2478	return LifetimeEndFn;
2479	}
2480
2481	namespace {
2482	/// A cleanup to perform a release of an object at the end of a
2483	/// function. This is used to balance out the incoming +1 of a
2484	/// ns_consumed argument when we can't reasonably do that just by
2485	/// not doing the initial retain for a __block argument.
2486	struct ConsumeARCParameter final : EHScopeStack::Cleanup {
2487	ConsumeARCParameter(llvm::Value *param,
2488	ARCPreciseLifetime_t precise)
2489	: Param(param), Precise(precise) {}
2490
2491	llvm::Value *Param;
2492	ARCPreciseLifetime_t Precise;
2493
2494	void Emit(CodeGenFunction &CGF, Flags flags) override {
2495	CGF.EmitARCRelease(value: Param, precise: Precise);
2496	}
2497	};
2498	} // end anonymous namespace
2499
2500	/// Emit an alloca (or GlobalValue depending on target)
2501	/// for the specified parameter and set up LocalDeclMap.
2502	void CodeGenFunction::EmitParmDecl(const VarDecl &D, ParamValue Arg,
2503	unsigned ArgNo) {
2504	bool NoDebugInfo = false;
2505	// FIXME: Why isn't ImplicitParamDecl a ParmVarDecl?
2506	assert((isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D)) &&
2507	"Invalid argument to EmitParmDecl");
2508
2509	// Set the name of the parameter's initial value to make IR easier to
2510	// read. Don't modify the names of globals.
2511	if (!isa<llvm::GlobalValue>(Val: Arg.getAnyValue()))
2512	Arg.getAnyValue()->setName(D.getName());
2513
2514	QualType Ty = D.getType();
2515
2516	// Use better IR generation for certain implicit parameters.
2517	if (auto IPD = dyn_cast<ImplicitParamDecl>(Val: &D)) {
2518	// The only implicit argument a block has is its literal.
2519	// This may be passed as an inalloca'ed value on Windows x86.
2520	if (BlockInfo) {
2521	llvm::Value *V = Arg.isIndirect()
2522	? Builder.CreateLoad(Addr: Arg.getIndirectAddress())
2523	: Arg.getDirectValue();
2524	setBlockContextParameter(D: IPD, argNum: ArgNo, ptr: V);
2525	return;
2526	}
2527	// Suppressing debug info for ThreadPrivateVar parameters, else it hides
2528	// debug info of TLS variables.
2529	NoDebugInfo =
2530	(IPD->getParameterKind() == ImplicitParamKind::ThreadPrivateVar);
2531	}
2532
2533	Address DeclPtr = Address::invalid();
2534	Address AllocaPtr = Address::invalid();
2535	bool DoStore = false;
2536	bool IsScalar = hasScalarEvaluationKind(T: Ty);
2537	bool UseIndirectDebugAddress = false;
2538
2539	// If we already have a pointer to the argument, reuse the input pointer.
2540	if (Arg.isIndirect()) {
2541	DeclPtr = Arg.getIndirectAddress();
2542	DeclPtr = DeclPtr.withElementType(ElemTy: ConvertTypeForMem(T: Ty));
2543	// Indirect argument is in alloca address space, which may be different
2544	// from the default address space.
2545	auto AllocaAS = CGM.getASTAllocaAddressSpace();
2546	auto *V = DeclPtr.getPointer();
2547	AllocaPtr = DeclPtr;
2548
2549	// For truly ABI indirect arguments -- those that are not `byval` -- store
2550	// the address of the argument on the stack to preserve debug information.
2551	ABIArgInfo ArgInfo = CurFnInfo->arguments()[ArgNo - 1].info;
2552	if (ArgInfo.isIndirect())
2553	UseIndirectDebugAddress = !ArgInfo.getIndirectByVal();
2554	if (UseIndirectDebugAddress) {
2555	auto PtrTy = getContext().getPointerType(T: Ty);
2556	AllocaPtr = CreateMemTemp(PtrTy, getContext().getTypeAlignInChars(PtrTy),
2557	D.getName() + ".indirect_addr");
2558	EmitStoreOfScalar(V, AllocaPtr, /* Volatile */ false, PtrTy);
2559	}
2560
2561	auto SrcLangAS = getLangOpts().OpenCL ? LangAS::opencl_private : AllocaAS;
2562	auto DestLangAS =
2563	getLangOpts().OpenCL ? LangAS::opencl_private : LangAS::Default;
2564	if (SrcLangAS != DestLangAS) {
2565	assert(getContext().getTargetAddressSpace(SrcLangAS) ==
2566	CGM.getDataLayout().getAllocaAddrSpace());
2567	auto DestAS = getContext().getTargetAddressSpace(AS: DestLangAS);
2568	auto *T = llvm::PointerType::get(C&: getLLVMContext(), AddressSpace: DestAS);
2569	DeclPtr =
2570	DeclPtr.withPointer(NewPointer: getTargetHooks().performAddrSpaceCast(
2571	*this, V, SrcLangAS, DestLangAS, T, true),
2572	IsKnownNonNull: DeclPtr.isKnownNonNull());
2573	}
2574
2575	// Push a destructor cleanup for this parameter if the ABI requires it.
2576	// Don't push a cleanup in a thunk for a method that will also emit a
2577	// cleanup.
2578	if (Ty->isRecordType() && !CurFuncIsThunk &&
2579	Ty->castAs<RecordType>()->getDecl()->isParamDestroyedInCallee()) {
2580	if (QualType::DestructionKind DtorKind =
2581	D.needsDestruction(Ctx: getContext())) {
2582	assert((DtorKind == QualType::DK_cxx_destructor ||
2583	DtorKind == QualType::DK_nontrivial_c_struct) &&
2584	"unexpected destructor type");
2585	pushDestroy(dtorKind: DtorKind, addr: DeclPtr, type: Ty);
2586	CalleeDestructedParamCleanups[cast<ParmVarDecl>(Val: &D)] =
2587	EHStack.stable_begin();
2588	}
2589	}
2590	} else {
2591	// Check if the parameter address is controlled by OpenMP runtime.
2592	Address OpenMPLocalAddr =
2593	getLangOpts().OpenMP
2594	? CGM.getOpenMPRuntime().getAddressOfLocalVariable(CGF&: *this, VD: &D)
2595	: Address::invalid();
2596	if (getLangOpts().OpenMP && OpenMPLocalAddr.isValid()) {
2597	DeclPtr = OpenMPLocalAddr;
2598	AllocaPtr = DeclPtr;
2599	} else {
2600	// Otherwise, create a temporary to hold the value.
2601	DeclPtr = CreateMemTemp(Ty, getContext().getDeclAlign(&D),
2602	D.getName() + ".addr", &AllocaPtr);
2603	}
2604	DoStore = true;
2605	}
2606
2607	llvm::Value *ArgVal = (DoStore ? Arg.getDirectValue() : nullptr);
2608
2609	LValue lv = MakeAddrLValue(Addr: DeclPtr, T: Ty);
2610	if (IsScalar) {
2611	Qualifiers qs = Ty.getQualifiers();
2612	if (Qualifiers::ObjCLifetime lt = qs.getObjCLifetime()) {
2613	// We honor __attribute__((ns_consumed)) for types with lifetime.
2614	// For __strong, it's handled by just skipping the initial retain;
2615	// otherwise we have to balance out the initial +1 with an extra
2616	// cleanup to do the release at the end of the function.
2617	bool isConsumed = D.hasAttr<NSConsumedAttr>();
2618
2619	// If a parameter is pseudo-strong then we can omit the implicit retain.
2620	if (D.isARCPseudoStrong()) {
2621	assert(lt == Qualifiers::OCL_Strong &&
2622	"pseudo-strong variable isn't strong?");
2623	assert(qs.hasConst() && "pseudo-strong variable should be const!");
2624	lt = Qualifiers::OCL_ExplicitNone;
2625	}
2626
2627	// Load objects passed indirectly.
2628	if (Arg.isIndirect() && !ArgVal)
2629	ArgVal = Builder.CreateLoad(Addr: DeclPtr);
2630
2631	if (lt == Qualifiers::OCL_Strong) {
2632	if (!isConsumed) {
2633	if (CGM.getCodeGenOpts().OptimizationLevel == 0) {
2634	// use objc_storeStrong(&dest, value) for retaining the
2635	// object. But first, store a null into 'dest' because
2636	// objc_storeStrong attempts to release its old value.
2637	llvm::Value *Null = CGM.EmitNullConstant(T: D.getType());
2638	EmitStoreOfScalar(value: Null, lvalue: lv, /* isInitialization */ isInit: true);
2639	EmitARCStoreStrongCall(addr: lv.getAddress(CGF&: *this), value: ArgVal, resultIgnored: true);
2640	DoStore = false;
2641	}
2642	else
2643	// Don't use objc_retainBlock for block pointers, because we
2644	// don't want to Block_copy something just because we got it
2645	// as a parameter.
2646	ArgVal = EmitARCRetainNonBlock(value: ArgVal);
2647	}
2648	} else {
2649	// Push the cleanup for a consumed parameter.
2650	if (isConsumed) {
2651	ARCPreciseLifetime_t precise = (D.hasAttr<ObjCPreciseLifetimeAttr>()
2652	? ARCPreciseLifetime : ARCImpreciseLifetime);
2653	EHStack.pushCleanup<ConsumeARCParameter>(Kind: getARCCleanupKind(), A: ArgVal,
2654	A: precise);
2655	}
2656
2657	if (lt == Qualifiers::OCL_Weak) {
2658	EmitARCInitWeak(addr: DeclPtr, value: ArgVal);
2659	DoStore = false; // The weak init is a store, no need to do two.
2660	}
2661	}
2662
2663	// Enter the cleanup scope.
2664	EmitAutoVarWithLifetime(CGF&: *this, var: D, addr: DeclPtr, lifetime: lt);
2665	}
2666	}
2667
2668	// Store the initial value into the alloca.
2669	if (DoStore)
2670	EmitStoreOfScalar(value: ArgVal, lvalue: lv, /* isInitialization */ isInit: true);
2671
2672	setAddrOfLocalVar(VD: &D, Addr: DeclPtr);
2673
2674	// Emit debug info for param declarations in non-thunk functions.
2675	if (CGDebugInfo *DI = getDebugInfo()) {
2676	if (CGM.getCodeGenOpts().hasReducedDebugInfo() && !CurFuncIsThunk &&
2677	!NoDebugInfo) {
2678	llvm::DILocalVariable *DILocalVar = DI->EmitDeclareOfArgVariable(
2679	Decl: &D, AI: AllocaPtr.getPointer(), ArgNo, Builder, UsePointerValue: UseIndirectDebugAddress);
2680	if (const auto *Var = dyn_cast_or_null<ParmVarDecl>(Val: &D))
2681	DI->getParamDbgMappings().insert(KV: {Var, DILocalVar});
2682	}
2683	}
2684
2685	if (D.hasAttr<AnnotateAttr>())
2686	EmitVarAnnotations(D: &D, V: DeclPtr.getPointer());
2687
2688	// We can only check return value nullability if all arguments to the
2689	// function satisfy their nullability preconditions. This makes it necessary
2690	// to emit null checks for args in the function body itself.
2691	if (requiresReturnValueNullabilityCheck()) {
2692	auto Nullability = Ty->getNullability();
2693	if (Nullability && *Nullability == NullabilityKind::NonNull) {
2694	SanitizerScope SanScope(this);
2695	RetValNullabilityPrecondition =
2696	Builder.CreateAnd(LHS: RetValNullabilityPrecondition,
2697	RHS: Builder.CreateIsNotNull(Arg: Arg.getAnyValue()));
2698	}
2699	}
2700	}
2701
2702	void CodeGenModule::EmitOMPDeclareReduction(const OMPDeclareReductionDecl *D,
2703	CodeGenFunction *CGF) {
2704	if (!LangOpts.OpenMP || (!LangOpts.EmitAllDecls && !D->isUsed()))
2705	return;
2706	getOpenMPRuntime().emitUserDefinedReduction(CGF, D);
2707	}
2708
2709	void CodeGenModule::EmitOMPDeclareMapper(const OMPDeclareMapperDecl *D,
2710	CodeGenFunction *CGF) {
2711	if (!LangOpts.OpenMP || LangOpts.OpenMPSimd ||
2712	(!LangOpts.EmitAllDecls && !D->isUsed()))
2713	return;
2714	getOpenMPRuntime().emitUserDefinedMapper(D, CGF);
2715	}
2716
2717	void CodeGenModule::EmitOMPRequiresDecl(const OMPRequiresDecl *D) {
2718	getOpenMPRuntime().processRequiresDirective(D);
2719	}
2720
2721	void CodeGenModule::EmitOMPAllocateDecl(const OMPAllocateDecl *D) {
2722	for (const Expr *E : D->varlists()) {
2723	const auto *DE = cast<DeclRefExpr>(Val: E);
2724	const auto *VD = cast<VarDecl>(Val: DE->getDecl());
2725
2726	// Skip all but globals.
2727	if (!VD->hasGlobalStorage())
2728	continue;
2729
2730	// Check if the global has been materialized yet or not. If not, we are done
2731	// as any later generation will utilize the OMPAllocateDeclAttr. However, if
2732	// we already emitted the global we might have done so before the
2733	// OMPAllocateDeclAttr was attached, leading to the wrong address space
2734	// (potentially). While not pretty, common practise is to remove the old IR
2735	// global and generate a new one, so we do that here too. Uses are replaced
2736	// properly.
2737	StringRef MangledName = getMangledName(GD: VD);
2738	llvm::GlobalValue *Entry = GetGlobalValue(Ref: MangledName);
2739	if (!Entry)
2740	continue;
2741
2742	// We can also keep the existing global if the address space is what we
2743	// expect it to be, if not, it is replaced.
2744	QualType ASTTy = VD->getType();
2745	clang::LangAS GVAS = GetGlobalVarAddressSpace(D: VD);
2746	auto TargetAS = getContext().getTargetAddressSpace(AS: GVAS);
2747	if (Entry->getType()->getAddressSpace() == TargetAS)
2748	continue;
2749
2750	// Make a new global with the correct type / address space.
2751	llvm::Type *Ty = getTypes().ConvertTypeForMem(T: ASTTy);
2752	llvm::PointerType *PTy = llvm::PointerType::get(ElementType: Ty, AddressSpace: TargetAS);
2753
2754	// Replace all uses of the old global with a cast. Since we mutate the type
2755	// in place we neeed an intermediate that takes the spot of the old entry
2756	// until we can create the cast.
2757	llvm::GlobalVariable *DummyGV = new llvm::GlobalVariable(
2758	getModule(), Entry->getValueType(), false,
2759	llvm::GlobalValue::CommonLinkage, nullptr, "dummy", nullptr,
2760	llvm::GlobalVariable::NotThreadLocal, Entry->getAddressSpace());
2761	Entry->replaceAllUsesWith(V: DummyGV);
2762
2763	Entry->mutateType(Ty: PTy);
2764	llvm::Constant *NewPtrForOldDecl =
2765	llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(
2766	C: Entry, Ty: DummyGV->getType());
2767
2768	// Now we have a casted version of the changed global, the dummy can be
2769	// replaced and deleted.
2770	DummyGV->replaceAllUsesWith(V: NewPtrForOldDecl);
2771	DummyGV->eraseFromParent();
2772	}
2773	}
2774
2775	std::optional<CharUnits>
2776	CodeGenModule::getOMPAllocateAlignment(const VarDecl *VD) {
2777	if (const auto *AA = VD->getAttr<OMPAllocateDeclAttr>()) {
2778	if (Expr *Alignment = AA->getAlignment()) {
2779	unsigned UserAlign =
2780	Alignment->EvaluateKnownConstInt(Ctx: getContext()).getExtValue();
2781	CharUnits NaturalAlign =
2782	getNaturalTypeAlignment(T: VD->getType().getNonReferenceType());
2783
2784	// OpenMP5.1 pg 185 lines 7-10
2785	// Each item in the align modifier list must be aligned to the maximum
2786	// of the specified alignment and the type's natural alignment.
2787	return CharUnits::fromQuantity(
2788	Quantity: std::max<unsigned>(a: UserAlign, b: NaturalAlign.getQuantity()));
2789	}
2790	}
2791	return std::nullopt;
2792	}
2793