1	//===--- CodeGenModule.cpp - Emit LLVM Code from ASTs for a Module --------===//
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 coordinates the per-module state used while generating code.
10	//
11	//===----------------------------------------------------------------------===//
12
13	#include "CodeGenModule.h"
14	#include "ABIInfo.h"
15	#include "CGBlocks.h"
16	#include "CGCUDARuntime.h"
17	#include "CGCXXABI.h"
18	#include "CGCall.h"
19	#include "CGDebugInfo.h"
20	#include "CGHLSLRuntime.h"
21	#include "CGObjCRuntime.h"
22	#include "CGOpenCLRuntime.h"
23	#include "CGOpenMPRuntime.h"
24	#include "CGOpenMPRuntimeGPU.h"
25	#include "CodeGenFunction.h"
26	#include "CodeGenPGO.h"
27	#include "ConstantEmitter.h"
28	#include "CoverageMappingGen.h"
29	#include "TargetInfo.h"
30	#include "clang/AST/ASTContext.h"
31	#include "clang/AST/ASTLambda.h"
32	#include "clang/AST/CharUnits.h"
33	#include "clang/AST/Decl.h"
34	#include "clang/AST/DeclCXX.h"
35	#include "clang/AST/DeclObjC.h"
36	#include "clang/AST/DeclTemplate.h"
37	#include "clang/AST/Mangle.h"
38	#include "clang/AST/RecursiveASTVisitor.h"
39	#include "clang/AST/StmtVisitor.h"
40	#include "clang/Basic/Builtins.h"
41	#include "clang/Basic/CharInfo.h"
42	#include "clang/Basic/CodeGenOptions.h"
43	#include "clang/Basic/Diagnostic.h"
44	#include "clang/Basic/FileManager.h"
45	#include "clang/Basic/Module.h"
46	#include "clang/Basic/SourceManager.h"
47	#include "clang/Basic/TargetInfo.h"
48	#include "clang/Basic/Version.h"
49	#include "clang/CodeGen/BackendUtil.h"
50	#include "clang/CodeGen/ConstantInitBuilder.h"
51	#include "clang/Frontend/FrontendDiagnostic.h"
52	#include "llvm/ADT/STLExtras.h"
53	#include "llvm/ADT/StringExtras.h"
54	#include "llvm/ADT/StringSwitch.h"
55	#include "llvm/Analysis/TargetLibraryInfo.h"
56	#include "llvm/Frontend/OpenMP/OMPIRBuilder.h"
57	#include "llvm/IR/AttributeMask.h"
58	#include "llvm/IR/CallingConv.h"
59	#include "llvm/IR/DataLayout.h"
60	#include "llvm/IR/Intrinsics.h"
61	#include "llvm/IR/LLVMContext.h"
62	#include "llvm/IR/Module.h"
63	#include "llvm/IR/ProfileSummary.h"
64	#include "llvm/ProfileData/InstrProfReader.h"
65	#include "llvm/ProfileData/SampleProf.h"
66	#include "llvm/Support/CRC.h"
67	#include "llvm/Support/CodeGen.h"
68	#include "llvm/Support/CommandLine.h"
69	#include "llvm/Support/ConvertUTF.h"
70	#include "llvm/Support/ErrorHandling.h"
71	#include "llvm/Support/RISCVISAInfo.h"
72	#include "llvm/Support/TimeProfiler.h"
73	#include "llvm/Support/xxhash.h"
74	#include "llvm/TargetParser/Triple.h"
75	#include "llvm/TargetParser/X86TargetParser.h"
76	#include <optional>
77
78	using namespace clang;
79	using namespace CodeGen;
80
81	static llvm::cl::opt<bool> LimitedCoverage(
82	"limited-coverage-experimental", llvm::cl::Hidden,
83	llvm::cl::desc("Emit limited coverage mapping information (experimental)"));
84
85	static const char AnnotationSection[] = "llvm.metadata";
86
87	static CGCXXABI *createCXXABI(CodeGenModule &CGM) {
88	switch (CGM.getContext().getCXXABIKind()) {
89	case TargetCXXABI::AppleARM64:
90	case TargetCXXABI::Fuchsia:
91	case TargetCXXABI::GenericAArch64:
92	case TargetCXXABI::GenericARM:
93	case TargetCXXABI::iOS:
94	case TargetCXXABI::WatchOS:
95	case TargetCXXABI::GenericMIPS:
96	case TargetCXXABI::GenericItanium:
97	case TargetCXXABI::WebAssembly:
98	case TargetCXXABI::XL:
99	return CreateItaniumCXXABI(CGM);
100	case TargetCXXABI::Microsoft:
101	return CreateMicrosoftCXXABI(CGM);
102	}
103
104	llvm_unreachable("invalid C++ ABI kind");
105	}
106
107	static std::unique_ptr<TargetCodeGenInfo>
108	createTargetCodeGenInfo(CodeGenModule &CGM) {
109	const TargetInfo &Target = CGM.getTarget();
110	const llvm::Triple &Triple = Target.getTriple();
111	const CodeGenOptions &CodeGenOpts = CGM.getCodeGenOpts();
112
113	switch (Triple.getArch()) {
114	default:
115	return createDefaultTargetCodeGenInfo(CGM);
116
117	case llvm::Triple::le32:
118	return createPNaClTargetCodeGenInfo(CGM);
119	case llvm::Triple::m68k:
120	return createM68kTargetCodeGenInfo(CGM);
121	case llvm::Triple::mips:
122	case llvm::Triple::mipsel:
123	if (Triple.getOS() == llvm::Triple::NaCl)
124	return createPNaClTargetCodeGenInfo(CGM);
125	return createMIPSTargetCodeGenInfo(CGM, /*IsOS32=*/true);
126
127	case llvm::Triple::mips64:
128	case llvm::Triple::mips64el:
129	return createMIPSTargetCodeGenInfo(CGM, /*IsOS32=*/false);
130
131	case llvm::Triple::avr: {
132	// For passing parameters, R8~R25 are used on avr, and R18~R25 are used
133	// on avrtiny. For passing return value, R18~R25 are used on avr, and
134	// R22~R25 are used on avrtiny.
135	unsigned NPR = Target.getABI() == "avrtiny" ? 6 : 18;
136	unsigned NRR = Target.getABI() == "avrtiny" ? 4 : 8;
137	return createAVRTargetCodeGenInfo(CGM, NPR, NRR);
138	}
139
140	case llvm::Triple::aarch64:
141	case llvm::Triple::aarch64_32:
142	case llvm::Triple::aarch64_be: {
143	AArch64ABIKind Kind = AArch64ABIKind::AAPCS;
144	if (Target.getABI() == "darwinpcs")
145	Kind = AArch64ABIKind::DarwinPCS;
146	else if (Triple.isOSWindows())
147	return createWindowsAArch64TargetCodeGenInfo(CGM, K: AArch64ABIKind::Win64);
148
149	return createAArch64TargetCodeGenInfo(CGM, Kind);
150	}
151
152	case llvm::Triple::wasm32:
153	case llvm::Triple::wasm64: {
154	WebAssemblyABIKind Kind = WebAssemblyABIKind::MVP;
155	if (Target.getABI() == "experimental-mv")
156	Kind = WebAssemblyABIKind::ExperimentalMV;
157	return createWebAssemblyTargetCodeGenInfo(CGM, K: Kind);
158	}
159
160	case llvm::Triple::arm:
161	case llvm::Triple::armeb:
162	case llvm::Triple::thumb:
163	case llvm::Triple::thumbeb: {
164	if (Triple.getOS() == llvm::Triple::Win32)
165	return createWindowsARMTargetCodeGenInfo(CGM, K: ARMABIKind::AAPCS_VFP);
166
167	ARMABIKind Kind = ARMABIKind::AAPCS;
168	StringRef ABIStr = Target.getABI();
169	if (ABIStr == "apcs-gnu")
170	Kind = ARMABIKind::APCS;
171	else if (ABIStr == "aapcs16")
172	Kind = ARMABIKind::AAPCS16_VFP;
173	else if (CodeGenOpts.FloatABI == "hard" ||
174	(CodeGenOpts.FloatABI != "soft" &&
175	(Triple.getEnvironment() == llvm::Triple::GNUEABIHF ||
176	Triple.getEnvironment() == llvm::Triple::MuslEABIHF ||
177	Triple.getEnvironment() == llvm::Triple::EABIHF)))
178	Kind = ARMABIKind::AAPCS_VFP;
179
180	return createARMTargetCodeGenInfo(CGM, Kind);
181	}
182
183	case llvm::Triple::ppc: {
184	if (Triple.isOSAIX())
185	return createAIXTargetCodeGenInfo(CGM, /*Is64Bit=*/false);
186
187	bool IsSoftFloat =
188	CodeGenOpts.FloatABI == "soft" || Target.hasFeature(Feature: "spe");
189	return createPPC32TargetCodeGenInfo(CGM, SoftFloatABI: IsSoftFloat);
190	}
191	case llvm::Triple::ppcle: {
192	bool IsSoftFloat = CodeGenOpts.FloatABI == "soft";
193	return createPPC32TargetCodeGenInfo(CGM, SoftFloatABI: IsSoftFloat);
194	}
195	case llvm::Triple::ppc64:
196	if (Triple.isOSAIX())
197	return createAIXTargetCodeGenInfo(CGM, /*Is64Bit=*/true);
198
199	if (Triple.isOSBinFormatELF()) {
200	PPC64_SVR4_ABIKind Kind = PPC64_SVR4_ABIKind::ELFv1;
201	if (Target.getABI() == "elfv2")
202	Kind = PPC64_SVR4_ABIKind::ELFv2;
203	bool IsSoftFloat = CodeGenOpts.FloatABI == "soft";
204
205	return createPPC64_SVR4_TargetCodeGenInfo(CGM, Kind, SoftFloatABI: IsSoftFloat);
206	}
207	return createPPC64TargetCodeGenInfo(CGM);
208	case llvm::Triple::ppc64le: {
209	assert(Triple.isOSBinFormatELF() && "PPC64 LE non-ELF not supported!");
210	PPC64_SVR4_ABIKind Kind = PPC64_SVR4_ABIKind::ELFv2;
211	if (Target.getABI() == "elfv1")
212	Kind = PPC64_SVR4_ABIKind::ELFv1;
213	bool IsSoftFloat = CodeGenOpts.FloatABI == "soft";
214
215	return createPPC64_SVR4_TargetCodeGenInfo(CGM, Kind, SoftFloatABI: IsSoftFloat);
216	}
217
218	case llvm::Triple::nvptx:
219	case llvm::Triple::nvptx64:
220	return createNVPTXTargetCodeGenInfo(CGM);
221
222	case llvm::Triple::msp430:
223	return createMSP430TargetCodeGenInfo(CGM);
224
225	case llvm::Triple::riscv32:
226	case llvm::Triple::riscv64: {
227	StringRef ABIStr = Target.getABI();
228	unsigned XLen = Target.getPointerWidth(AddrSpace: LangAS::Default);
229	unsigned ABIFLen = 0;
230	if (ABIStr.ends_with(Suffix: "f"))
231	ABIFLen = 32;
232	else if (ABIStr.ends_with(Suffix: "d"))
233	ABIFLen = 64;
234	bool EABI = ABIStr.ends_with(Suffix: "e");
235	return createRISCVTargetCodeGenInfo(CGM, XLen, FLen: ABIFLen, EABI);
236	}
237
238	case llvm::Triple::systemz: {
239	bool SoftFloat = CodeGenOpts.FloatABI == "soft";
240	bool HasVector = !SoftFloat && Target.getABI() == "vector";
241	return createSystemZTargetCodeGenInfo(CGM, HasVector, SoftFloatABI: SoftFloat);
242	}
243
244	case llvm::Triple::tce:
245	case llvm::Triple::tcele:
246	return createTCETargetCodeGenInfo(CGM);
247
248	case llvm::Triple::x86: {
249	bool IsDarwinVectorABI = Triple.isOSDarwin();
250	bool IsWin32FloatStructABI = Triple.isOSWindows() && !Triple.isOSCygMing();
251
252	if (Triple.getOS() == llvm::Triple::Win32) {
253	return createWinX86_32TargetCodeGenInfo(
254	CGM, DarwinVectorABI: IsDarwinVectorABI, Win32StructABI: IsWin32FloatStructABI,
255	NumRegisterParameters: CodeGenOpts.NumRegisterParameters);
256	}
257	return createX86_32TargetCodeGenInfo(
258	CGM, DarwinVectorABI: IsDarwinVectorABI, Win32StructABI: IsWin32FloatStructABI,
259	NumRegisterParameters: CodeGenOpts.NumRegisterParameters, SoftFloatABI: CodeGenOpts.FloatABI == "soft");
260	}
261
262	case llvm::Triple::x86_64: {
263	StringRef ABI = Target.getABI();
264	X86AVXABILevel AVXLevel = (ABI == "avx512" ? X86AVXABILevel::AVX512
265	: ABI == "avx" ? X86AVXABILevel::AVX
266	: X86AVXABILevel::None);
267
268	switch (Triple.getOS()) {
269	case llvm::Triple::Win32:
270	return createWinX86_64TargetCodeGenInfo(CGM, AVXLevel);
271	default:
272	return createX86_64TargetCodeGenInfo(CGM, AVXLevel);
273	}
274	}
275	case llvm::Triple::hexagon:
276	return createHexagonTargetCodeGenInfo(CGM);
277	case llvm::Triple::lanai:
278	return createLanaiTargetCodeGenInfo(CGM);
279	case llvm::Triple::r600:
280	return createAMDGPUTargetCodeGenInfo(CGM);
281	case llvm::Triple::amdgcn:
282	return createAMDGPUTargetCodeGenInfo(CGM);
283	case llvm::Triple::sparc:
284	return createSparcV8TargetCodeGenInfo(CGM);
285	case llvm::Triple::sparcv9:
286	return createSparcV9TargetCodeGenInfo(CGM);
287	case llvm::Triple::xcore:
288	return createXCoreTargetCodeGenInfo(CGM);
289	case llvm::Triple::arc:
290	return createARCTargetCodeGenInfo(CGM);
291	case llvm::Triple::spir:
292	case llvm::Triple::spir64:
293	return createCommonSPIRTargetCodeGenInfo(CGM);
294	case llvm::Triple::spirv32:
295	case llvm::Triple::spirv64:
296	return createSPIRVTargetCodeGenInfo(CGM);
297	case llvm::Triple::ve:
298	return createVETargetCodeGenInfo(CGM);
299	case llvm::Triple::csky: {
300	bool IsSoftFloat = !Target.hasFeature(Feature: "hard-float-abi");
301	bool hasFP64 =
302	Target.hasFeature(Feature: "fpuv2_df") || Target.hasFeature(Feature: "fpuv3_df");
303	return createCSKYTargetCodeGenInfo(CGM, FLen: IsSoftFloat ? 0
304	: hasFP64 ? 64
305	: 32);
306	}
307	case llvm::Triple::bpfeb:
308	case llvm::Triple::bpfel:
309	return createBPFTargetCodeGenInfo(CGM);
310	case llvm::Triple::loongarch32:
311	case llvm::Triple::loongarch64: {
312	StringRef ABIStr = Target.getABI();
313	unsigned ABIFRLen = 0;
314	if (ABIStr.ends_with(Suffix: "f"))
315	ABIFRLen = 32;
316	else if (ABIStr.ends_with(Suffix: "d"))
317	ABIFRLen = 64;
318	return createLoongArchTargetCodeGenInfo(
319	CGM, GRLen: Target.getPointerWidth(AddrSpace: LangAS::Default), FLen: ABIFRLen);
320	}
321	}
322	}
323
324	const TargetCodeGenInfo &CodeGenModule::getTargetCodeGenInfo() {
325	if (!TheTargetCodeGenInfo)
326	TheTargetCodeGenInfo = createTargetCodeGenInfo(CGM&: *this);
327	return *TheTargetCodeGenInfo;
328	}
329
330	CodeGenModule::CodeGenModule(ASTContext &C,
331	IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS,
332	const HeaderSearchOptions &HSO,
333	const PreprocessorOptions &PPO,
334	const CodeGenOptions &CGO, llvm::Module &M,
335	DiagnosticsEngine &diags,
336	CoverageSourceInfo *CoverageInfo)
337	: Context(C), LangOpts(C.getLangOpts()), FS(FS), HeaderSearchOpts(HSO),
338	PreprocessorOpts(PPO), CodeGenOpts(CGO), TheModule(M), Diags(diags),
339	Target(C.getTargetInfo()), ABI(createCXXABI(CGM&: *this)),
340	VMContext(M.getContext()), Types(*this), VTables(*this),
341	SanitizerMD(new SanitizerMetadata(*this)) {
342
343	// Initialize the type cache.
344	llvm::LLVMContext &LLVMContext = M.getContext();
345	VoidTy = llvm::Type::getVoidTy(C&: LLVMContext);
346	Int8Ty = llvm::Type::getInt8Ty(C&: LLVMContext);
347	Int16Ty = llvm::Type::getInt16Ty(C&: LLVMContext);
348	Int32Ty = llvm::Type::getInt32Ty(C&: LLVMContext);
349	Int64Ty = llvm::Type::getInt64Ty(C&: LLVMContext);
350	HalfTy = llvm::Type::getHalfTy(C&: LLVMContext);
351	BFloatTy = llvm::Type::getBFloatTy(C&: LLVMContext);
352	FloatTy = llvm::Type::getFloatTy(C&: LLVMContext);
353	DoubleTy = llvm::Type::getDoubleTy(C&: LLVMContext);
354	PointerWidthInBits = C.getTargetInfo().getPointerWidth(AddrSpace: LangAS::Default);
355	PointerAlignInBytes =
356	C.toCharUnitsFromBits(BitSize: C.getTargetInfo().getPointerAlign(AddrSpace: LangAS::Default))
357	.getQuantity();
358	SizeSizeInBytes =
359	C.toCharUnitsFromBits(BitSize: C.getTargetInfo().getMaxPointerWidth()).getQuantity();
360	IntAlignInBytes =
361	C.toCharUnitsFromBits(BitSize: C.getTargetInfo().getIntAlign()).getQuantity();
362	CharTy =
363	llvm::IntegerType::get(C&: LLVMContext, NumBits: C.getTargetInfo().getCharWidth());
364	IntTy = llvm::IntegerType::get(C&: LLVMContext, NumBits: C.getTargetInfo().getIntWidth());
365	IntPtrTy = llvm::IntegerType::get(C&: LLVMContext,
366	NumBits: C.getTargetInfo().getMaxPointerWidth());
367	Int8PtrTy = llvm::PointerType::get(C&: LLVMContext, AddressSpace: 0);
368	const llvm::DataLayout &DL = M.getDataLayout();
369	AllocaInt8PtrTy =
370	llvm::PointerType::get(C&: LLVMContext, AddressSpace: DL.getAllocaAddrSpace());
371	GlobalsInt8PtrTy =
372	llvm::PointerType::get(C&: LLVMContext, AddressSpace: DL.getDefaultGlobalsAddressSpace());
373	ConstGlobalsPtrTy = llvm::PointerType::get(
374	C&: LLVMContext, AddressSpace: C.getTargetAddressSpace(AS: GetGlobalConstantAddressSpace()));
375	ASTAllocaAddressSpace = getTargetCodeGenInfo().getASTAllocaAddressSpace();
376
377	// Build C++20 Module initializers.
378	// TODO: Add Microsoft here once we know the mangling required for the
379	// initializers.
380	CXX20ModuleInits =
381	LangOpts.CPlusPlusModules && getCXXABI().getMangleContext().getKind() ==
382	ItaniumMangleContext::MK_Itanium;
383
384	RuntimeCC = getTargetCodeGenInfo().getABIInfo().getRuntimeCC();
385
386	if (LangOpts.ObjC)
387	createObjCRuntime();
388	if (LangOpts.OpenCL)
389	createOpenCLRuntime();
390	if (LangOpts.OpenMP)
391	createOpenMPRuntime();
392	if (LangOpts.CUDA)
393	createCUDARuntime();
394	if (LangOpts.HLSL)
395	createHLSLRuntime();
396
397	// Enable TBAA unless it's suppressed. ThreadSanitizer needs TBAA even at O0.
398	if (LangOpts.Sanitize.has(K: SanitizerKind::Thread) ||
399	(!CodeGenOpts.RelaxedAliasing && CodeGenOpts.OptimizationLevel > 0))
400	TBAA.reset(p: new CodeGenTBAA(Context, TheModule, CodeGenOpts, getLangOpts(),
401	getCXXABI().getMangleContext()));
402
403	// If debug info or coverage generation is enabled, create the CGDebugInfo
404	// object.
405	if (CodeGenOpts.getDebugInfo() != llvm::codegenoptions::NoDebugInfo ||
406	CodeGenOpts.CoverageNotesFile.size() ||
407	CodeGenOpts.CoverageDataFile.size())
408	DebugInfo.reset(p: new CGDebugInfo(*this));
409
410	Block.GlobalUniqueCount = 0;
411
412	if (C.getLangOpts().ObjC)
413	ObjCData.reset(p: new ObjCEntrypoints());
414
415	if (CodeGenOpts.hasProfileClangUse()) {
416	auto ReaderOrErr = llvm::IndexedInstrProfReader::create(
417	Path: CodeGenOpts.ProfileInstrumentUsePath, FS&: *FS,
418	RemappingPath: CodeGenOpts.ProfileRemappingFile);
419	// We're checking for profile read errors in CompilerInvocation, so if
420	// there was an error it should've already been caught. If it hasn't been
421	// somehow, trip an assertion.
422	assert(ReaderOrErr);
423	PGOReader = std::move(ReaderOrErr.get());
424	}
425
426	// If coverage mapping generation is enabled, create the
427	// CoverageMappingModuleGen object.
428	if (CodeGenOpts.CoverageMapping)
429	CoverageMapping.reset(p: new CoverageMappingModuleGen(*this, *CoverageInfo));
430
431	// Generate the module name hash here if needed.
432	if (CodeGenOpts.UniqueInternalLinkageNames &&
433	!getModule().getSourceFileName().empty()) {
434	std::string Path = getModule().getSourceFileName();
435	// Check if a path substitution is needed from the MacroPrefixMap.
436	for (const auto &Entry : LangOpts.MacroPrefixMap)
437	if (Path.rfind(str: Entry.first, pos: 0) != std::string::npos) {
438	Path = Entry.second + Path.substr(pos: Entry.first.size());
439	break;
440	}
441	ModuleNameHash = llvm::getUniqueInternalLinkagePostfix(FName: Path);
442	}
443	}
444
445	CodeGenModule::~CodeGenModule() {}
446
447	void CodeGenModule::createObjCRuntime() {
448	// This is just isGNUFamily(), but we want to force implementors of
449	// new ABIs to decide how best to do this.
450	switch (LangOpts.ObjCRuntime.getKind()) {
451	case ObjCRuntime::GNUstep:
452	case ObjCRuntime::GCC:
453	case ObjCRuntime::ObjFW:
454	ObjCRuntime.reset(p: CreateGNUObjCRuntime(CGM&: *this));
455	return;
456
457	case ObjCRuntime::FragileMacOSX:
458	case ObjCRuntime::MacOSX:
459	case ObjCRuntime::iOS:
460	case ObjCRuntime::WatchOS:
461	ObjCRuntime.reset(p: CreateMacObjCRuntime(CGM&: *this));
462	return;
463	}
464	llvm_unreachable("bad runtime kind");
465	}
466
467	void CodeGenModule::createOpenCLRuntime() {
468	OpenCLRuntime.reset(p: new CGOpenCLRuntime(*this));
469	}
470
471	void CodeGenModule::createOpenMPRuntime() {
472	// Select a specialized code generation class based on the target, if any.
473	// If it does not exist use the default implementation.
474	switch (getTriple().getArch()) {
475	case llvm::Triple::nvptx:
476	case llvm::Triple::nvptx64:
477	case llvm::Triple::amdgcn:
478	assert(getLangOpts().OpenMPIsTargetDevice &&
479	"OpenMP AMDGPU/NVPTX is only prepared to deal with device code.");
480	OpenMPRuntime.reset(new CGOpenMPRuntimeGPU(*this));
481	break;
482	default:
483	if (LangOpts.OpenMPSimd)
484	OpenMPRuntime.reset(new CGOpenMPSIMDRuntime(*this));
485	else
486	OpenMPRuntime.reset(p: new CGOpenMPRuntime(*this));
487	break;
488	}
489	}
490
491	void CodeGenModule::createCUDARuntime() {
492	CUDARuntime.reset(p: CreateNVCUDARuntime(CGM&: *this));
493	}
494
495	void CodeGenModule::createHLSLRuntime() {
496	HLSLRuntime.reset(p: new CGHLSLRuntime(*this));
497	}
498
499	void CodeGenModule::addReplacement(StringRef Name, llvm::Constant *C) {
500	Replacements[Name] = C;
501	}
502
503	void CodeGenModule::applyReplacements() {
504	for (auto &I : Replacements) {
505	StringRef MangledName = I.first;
506	llvm::Constant *Replacement = I.second;
507	llvm::GlobalValue *Entry = GetGlobalValue(Ref: MangledName);
508	if (!Entry)
509	continue;
510	auto *OldF = cast<llvm::Function>(Val: Entry);
511	auto *NewF = dyn_cast<llvm::Function>(Val: Replacement);
512	if (!NewF) {
513	if (auto *Alias = dyn_cast<llvm::GlobalAlias>(Val: Replacement)) {
514	NewF = dyn_cast<llvm::Function>(Val: Alias->getAliasee());
515	} else {
516	auto *CE = cast<llvm::ConstantExpr>(Val: Replacement);
517	assert(CE->getOpcode() == llvm::Instruction::BitCast ||
518	CE->getOpcode() == llvm::Instruction::GetElementPtr);
519	NewF = dyn_cast<llvm::Function>(Val: CE->getOperand(i_nocapture: 0));
520	}
521	}
522
523	// Replace old with new, but keep the old order.
524	OldF->replaceAllUsesWith(V: Replacement);
525	if (NewF) {
526	NewF->removeFromParent();
527	OldF->getParent()->getFunctionList().insertAfter(where: OldF->getIterator(),
528	New: NewF);
529	}
530	OldF->eraseFromParent();
531	}
532	}
533
534	void CodeGenModule::addGlobalValReplacement(llvm::GlobalValue *GV, llvm::Constant *C) {
535	GlobalValReplacements.push_back(Elt: std::make_pair(x&: GV, y&: C));
536	}
537
538	void CodeGenModule::applyGlobalValReplacements() {
539	for (auto &I : GlobalValReplacements) {
540	llvm::GlobalValue *GV = I.first;
541	llvm::Constant *C = I.second;
542
543	GV->replaceAllUsesWith(V: C);
544	GV->eraseFromParent();
545	}
546	}
547
548	// This is only used in aliases that we created and we know they have a
549	// linear structure.
550	static const llvm::GlobalValue *getAliasedGlobal(const llvm::GlobalValue *GV) {
551	const llvm::Constant *C;
552	if (auto *GA = dyn_cast<llvm::GlobalAlias>(Val: GV))
553	C = GA->getAliasee();
554	else if (auto *GI = dyn_cast<llvm::GlobalIFunc>(Val: GV))
555	C = GI->getResolver();
556	else
557	return GV;
558
559	const auto *AliaseeGV = dyn_cast<llvm::GlobalValue>(Val: C->stripPointerCasts());
560	if (!AliaseeGV)
561	return nullptr;
562
563	const llvm::GlobalValue *FinalGV = AliaseeGV->getAliaseeObject();
564	if (FinalGV == GV)
565	return nullptr;
566
567	return FinalGV;
568	}
569
570	static bool checkAliasedGlobal(
571	const ASTContext &Context, DiagnosticsEngine &Diags, SourceLocation Location,
572	bool IsIFunc, const llvm::GlobalValue *Alias, const llvm::GlobalValue *&GV,
573	const llvm::MapVector<GlobalDecl, StringRef> &MangledDeclNames,
574	SourceRange AliasRange) {
575	GV = getAliasedGlobal(GV: Alias);
576	if (!GV) {
577	Diags.Report(Location, diag::err_cyclic_alias) << IsIFunc;
578	return false;
579	}
580
581	if (GV->hasCommonLinkage()) {
582	const llvm::Triple &Triple = Context.getTargetInfo().getTriple();
583	if (Triple.getObjectFormat() == llvm::Triple::XCOFF) {
584	Diags.Report(Location, diag::err_alias_to_common);
585	return false;
586	}
587	}
588
589	if (GV->isDeclaration()) {
590	Diags.Report(Location, diag::err_alias_to_undefined) << IsIFunc << IsIFunc;
591	Diags.Report(Location, diag::note_alias_requires_mangled_name)
592	<< IsIFunc << IsIFunc;
593	// Provide a note if the given function is not found and exists as a
594	// mangled name.
595	for (const auto &[Decl, Name] : MangledDeclNames) {
596	if (const auto *ND = dyn_cast<NamedDecl>(Val: Decl.getDecl())) {
597	if (ND->getName() == GV->getName()) {
598	Diags.Report(Location, diag::note_alias_mangled_name_alternative)
599	<< Name
600	<< FixItHint::CreateReplacement(
601	AliasRange,
602	(Twine(IsIFunc ? "ifunc" : "alias") + "(\"" + Name + "\")")
603	.str());
604	}
605	}
606	}
607	return false;
608	}
609
610	if (IsIFunc) {
611	// Check resolver function type.
612	const auto *F = dyn_cast<llvm::Function>(Val: GV);
613	if (!F) {
614	Diags.Report(Location, diag::err_alias_to_undefined)
615	<< IsIFunc << IsIFunc;
616	return false;
617	}
618
619	llvm::FunctionType *FTy = F->getFunctionType();
620	if (!FTy->getReturnType()->isPointerTy()) {
621	Diags.Report(Location, diag::err_ifunc_resolver_return);
622	return false;
623	}
624	}
625
626	return true;
627	}
628
629	void CodeGenModule::checkAliases() {
630	// Check if the constructed aliases are well formed. It is really unfortunate
631	// that we have to do this in CodeGen, but we only construct mangled names
632	// and aliases during codegen.
633	bool Error = false;
634	DiagnosticsEngine &Diags = getDiags();
635	for (const GlobalDecl &GD : Aliases) {
636	const auto *D = cast<ValueDecl>(Val: GD.getDecl());
637	SourceLocation Location;
638	SourceRange Range;
639	bool IsIFunc = D->hasAttr<IFuncAttr>();
640	if (const Attr *A = D->getDefiningAttr()) {
641	Location = A->getLocation();
642	Range = A->getRange();
643	} else
644	llvm_unreachable("Not an alias or ifunc?");
645
646	StringRef MangledName = getMangledName(GD);
647	llvm::GlobalValue *Alias = GetGlobalValue(Ref: MangledName);
648	const llvm::GlobalValue *GV = nullptr;
649	if (!checkAliasedGlobal(Context: getContext(), Diags, Location, IsIFunc, Alias, GV,
650	MangledDeclNames, AliasRange: Range)) {
651	Error = true;
652	continue;
653	}
654
655	llvm::Constant *Aliasee =
656	IsIFunc ? cast<llvm::GlobalIFunc>(Val: Alias)->getResolver()
657	: cast<llvm::GlobalAlias>(Val: Alias)->getAliasee();
658
659	llvm::GlobalValue *AliaseeGV;
660	if (auto CE = dyn_cast<llvm::ConstantExpr>(Val: Aliasee))
661	AliaseeGV = cast<llvm::GlobalValue>(Val: CE->getOperand(i_nocapture: 0));
662	else
663	AliaseeGV = cast<llvm::GlobalValue>(Val: Aliasee);
664
665	if (const SectionAttr *SA = D->getAttr<SectionAttr>()) {
666	StringRef AliasSection = SA->getName();
667	if (AliasSection != AliaseeGV->getSection())
668	Diags.Report(SA->getLocation(), diag::warn_alias_with_section)
669	<< AliasSection << IsIFunc << IsIFunc;
670	}
671
672	// We have to handle alias to weak aliases in here. LLVM itself disallows
673	// this since the object semantics would not match the IL one. For
674	// compatibility with gcc we implement it by just pointing the alias
675	// to its aliasee's aliasee. We also warn, since the user is probably
676	// expecting the link to be weak.
677	if (auto *GA = dyn_cast<llvm::GlobalAlias>(Val: AliaseeGV)) {
678	if (GA->isInterposable()) {
679	Diags.Report(Location, diag::warn_alias_to_weak_alias)
680	<< GV->getName() << GA->getName() << IsIFunc;
681	Aliasee = llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(
682	C: GA->getAliasee(), Ty: Alias->getType());
683
684	if (IsIFunc)
685	cast<llvm::GlobalIFunc>(Val: Alias)->setResolver(Aliasee);
686	else
687	cast<llvm::GlobalAlias>(Val: Alias)->setAliasee(Aliasee);
688	}
689	}
690	}
691	if (!Error)
692	return;
693
694	for (const GlobalDecl &GD : Aliases) {
695	StringRef MangledName = getMangledName(GD);
696	llvm::GlobalValue *Alias = GetGlobalValue(Ref: MangledName);
697	Alias->replaceAllUsesWith(V: llvm::UndefValue::get(T: Alias->getType()));
698	Alias->eraseFromParent();
699	}
700	}
701
702	void CodeGenModule::clear() {
703	DeferredDeclsToEmit.clear();
704	EmittedDeferredDecls.clear();
705	DeferredAnnotations.clear();
706	if (OpenMPRuntime)
707	OpenMPRuntime->clear();
708	}
709
710	void InstrProfStats::reportDiagnostics(DiagnosticsEngine &Diags,
711	StringRef MainFile) {
712	if (!hasDiagnostics())
713	return;
714	if (VisitedInMainFile > 0 && VisitedInMainFile == MissingInMainFile) {
715	if (MainFile.empty())
716	MainFile = "<stdin>";
717	Diags.Report(diag::warn_profile_data_unprofiled) << MainFile;
718	} else {
719	if (Mismatched > 0)
720	Diags.Report(diag::warn_profile_data_out_of_date) << Visited << Mismatched;
721
722	if (Missing > 0)
723	Diags.Report(diag::warn_profile_data_missing) << Visited << Missing;
724	}
725	}
726
727	static std::optional<llvm::GlobalValue::VisibilityTypes>
728	getLLVMVisibility(clang::LangOptions::VisibilityFromDLLStorageClassKinds K) {
729	// Map to LLVM visibility.
730	switch (K) {
731	case clang::LangOptions::VisibilityFromDLLStorageClassKinds::Keep:
732	return std::nullopt;
733	case clang::LangOptions::VisibilityFromDLLStorageClassKinds::Default:
734	return llvm::GlobalValue::DefaultVisibility;
735	case clang::LangOptions::VisibilityFromDLLStorageClassKinds::Hidden:
736	return llvm::GlobalValue::HiddenVisibility;
737	case clang::LangOptions::VisibilityFromDLLStorageClassKinds::Protected:
738	return llvm::GlobalValue::ProtectedVisibility;
739	}
740	llvm_unreachable("unknown option value!");
741	}
742
743	void setLLVMVisibility(llvm::GlobalValue &GV,
744	std::optional<llvm::GlobalValue::VisibilityTypes> V) {
745	if (!V)
746	return;
747
748	// Reset DSO locality before setting the visibility. This removes
749	// any effects that visibility options and annotations may have
750	// had on the DSO locality. Setting the visibility will implicitly set
751	// appropriate globals to DSO Local; however, this will be pessimistic
752	// w.r.t. to the normal compiler IRGen.
753	GV.setDSOLocal(false);
754	GV.setVisibility(*V);
755	}
756
757	static void setVisibilityFromDLLStorageClass(const clang::LangOptions &LO,
758	llvm::Module &M) {
759	if (!LO.VisibilityFromDLLStorageClass)
760	return;
761
762	std::optional<llvm::GlobalValue::VisibilityTypes> DLLExportVisibility =
763	getLLVMVisibility(K: LO.getDLLExportVisibility());
764
765	std::optional<llvm::GlobalValue::VisibilityTypes>
766	NoDLLStorageClassVisibility =
767	getLLVMVisibility(K: LO.getNoDLLStorageClassVisibility());
768
769	std::optional<llvm::GlobalValue::VisibilityTypes>
770	ExternDeclDLLImportVisibility =
771	getLLVMVisibility(K: LO.getExternDeclDLLImportVisibility());
772
773	std::optional<llvm::GlobalValue::VisibilityTypes>
774	ExternDeclNoDLLStorageClassVisibility =
775	getLLVMVisibility(K: LO.getExternDeclNoDLLStorageClassVisibility());
776
777	for (llvm::GlobalValue &GV : M.global_values()) {
778	if (GV.hasAppendingLinkage() || GV.hasLocalLinkage())
779	continue;
780
781	if (GV.isDeclarationForLinker())
782	setLLVMVisibility(GV, V: GV.getDLLStorageClass() ==
783	llvm::GlobalValue::DLLImportStorageClass
784	? ExternDeclDLLImportVisibility
785	: ExternDeclNoDLLStorageClassVisibility);
786	else
787	setLLVMVisibility(GV, V: GV.getDLLStorageClass() ==
788	llvm::GlobalValue::DLLExportStorageClass
789	? DLLExportVisibility
790	: NoDLLStorageClassVisibility);
791
792	GV.setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
793	}
794	}
795
796	static bool isStackProtectorOn(const LangOptions &LangOpts,
797	const llvm::Triple &Triple,
798	clang::LangOptions::StackProtectorMode Mode) {
799	if (Triple.isAMDGPU() || Triple.isNVPTX())
800	return false;
801	return LangOpts.getStackProtector() == Mode;
802	}
803
804	void CodeGenModule::Release() {
805	Module *Primary = getContext().getCurrentNamedModule();
806	if (CXX20ModuleInits && Primary && !Primary->isHeaderLikeModule())
807	EmitModuleInitializers(Primary);
808	EmitDeferred();
809	DeferredDecls.insert(I: EmittedDeferredDecls.begin(),
810	E: EmittedDeferredDecls.end());
811	EmittedDeferredDecls.clear();
812	EmitVTablesOpportunistically();
813	applyGlobalValReplacements();
814	applyReplacements();
815	emitMultiVersionFunctions();
816
817	if (Context.getLangOpts().IncrementalExtensions &&
818	GlobalTopLevelStmtBlockInFlight.first) {
819	const TopLevelStmtDecl *TLSD = GlobalTopLevelStmtBlockInFlight.second;
820	GlobalTopLevelStmtBlockInFlight.first->FinishFunction(EndLoc: TLSD->getEndLoc());
821	GlobalTopLevelStmtBlockInFlight = {nullptr, nullptr};
822	}
823
824	// Module implementations are initialized the same way as a regular TU that
825	// imports one or more modules.
826	if (CXX20ModuleInits && Primary && Primary->isInterfaceOrPartition())
827	EmitCXXModuleInitFunc(Primary);
828	else
829	EmitCXXGlobalInitFunc();
830	EmitCXXGlobalCleanUpFunc();
831	registerGlobalDtorsWithAtExit();
832	EmitCXXThreadLocalInitFunc();
833	if (ObjCRuntime)
834	if (llvm::Function *ObjCInitFunction = ObjCRuntime->ModuleInitFunction())
835	AddGlobalCtor(Ctor: ObjCInitFunction);
836	if (Context.getLangOpts().CUDA && CUDARuntime) {
837	if (llvm::Function *CudaCtorFunction = CUDARuntime->finalizeModule())
838	AddGlobalCtor(Ctor: CudaCtorFunction);
839	}
840	if (OpenMPRuntime) {
841	if (llvm::Function *OpenMPRequiresDirectiveRegFun =
842	OpenMPRuntime->emitRequiresDirectiveRegFun()) {
843	AddGlobalCtor(Ctor: OpenMPRequiresDirectiveRegFun, Priority: 0);
844	}
845	OpenMPRuntime->createOffloadEntriesAndInfoMetadata();
846	OpenMPRuntime->clear();
847	}
848	if (PGOReader) {
849	getModule().setProfileSummary(
850	M: PGOReader->getSummary(/* UseCS */ false).getMD(Context&: VMContext),
851	Kind: llvm::ProfileSummary::PSK_Instr);
852	if (PGOStats.hasDiagnostics())
853	PGOStats.reportDiagnostics(Diags&: getDiags(), MainFile: getCodeGenOpts().MainFileName);
854	}
855	llvm::stable_sort(Range&: GlobalCtors, C: [](const Structor &L, const Structor &R) {
856	return L.LexOrder < R.LexOrder;
857	});
858	EmitCtorList(Fns&: GlobalCtors, GlobalName: "llvm.global_ctors");
859	EmitCtorList(Fns&: GlobalDtors, GlobalName: "llvm.global_dtors");
860	EmitGlobalAnnotations();
861	EmitStaticExternCAliases();
862	checkAliases();
863	EmitDeferredUnusedCoverageMappings();
864	CodeGenPGO(*this).setValueProfilingFlag(getModule());
865	if (CoverageMapping)
866	CoverageMapping->emit();
867	if (CodeGenOpts.SanitizeCfiCrossDso) {
868	CodeGenFunction(*this).EmitCfiCheckFail();
869	CodeGenFunction(*this).EmitCfiCheckStub();
870	}
871	if (LangOpts.Sanitize.has(K: SanitizerKind::KCFI))
872	finalizeKCFITypes();
873	emitAtAvailableLinkGuard();
874	if (Context.getTargetInfo().getTriple().isWasm())
875	EmitMainVoidAlias();
876
877	if (getTriple().isAMDGPU()) {
878	// Emit amdgpu_code_object_version module flag, which is code object version
879	// times 100.
880	if (getTarget().getTargetOpts().CodeObjectVersion !=
881	llvm::CodeObjectVersionKind::COV_None) {
882	getModule().addModuleFlag(Behavior: llvm::Module::Error,
883	Key: "amdgpu_code_object_version",
884	Val: getTarget().getTargetOpts().CodeObjectVersion);
885	}
886
887	// Currently, "-mprintf-kind" option is only supported for HIP
888	if (LangOpts.HIP) {
889	auto *MDStr = llvm::MDString::get(
890	Context&: getLLVMContext(), Str: (getTarget().getTargetOpts().AMDGPUPrintfKindVal ==
891	TargetOptions::AMDGPUPrintfKind::Hostcall)
892	? "hostcall"
893	: "buffered");
894	getModule().addModuleFlag(Behavior: llvm::Module::Error, Key: "amdgpu_printf_kind",
895	Val: MDStr);
896	}
897	}
898
899	// Emit a global array containing all external kernels or device variables
900	// used by host functions and mark it as used for CUDA/HIP. This is necessary
901	// to get kernels or device variables in archives linked in even if these
902	// kernels or device variables are only used in host functions.
903	if (!Context.CUDAExternalDeviceDeclODRUsedByHost.empty()) {
904	SmallVector<llvm::Constant *, 8> UsedArray;
905	for (auto D : Context.CUDAExternalDeviceDeclODRUsedByHost) {
906	GlobalDecl GD;
907	if (auto *FD = dyn_cast<FunctionDecl>(Val: D))
908	GD = GlobalDecl(FD, KernelReferenceKind::Kernel);
909	else
910	GD = GlobalDecl(D);
911	UsedArray.push_back(Elt: llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(
912	C: GetAddrOfGlobal(GD), Ty: Int8PtrTy));
913	}
914
915	llvm::ArrayType *ATy = llvm::ArrayType::get(ElementType: Int8PtrTy, NumElements: UsedArray.size());
916
917	auto *GV = new llvm::GlobalVariable(
918	getModule(), ATy, false, llvm::GlobalValue::InternalLinkage,
919	llvm::ConstantArray::get(T: ATy, V: UsedArray), "__clang_gpu_used_external");
920	addCompilerUsedGlobal(GV);
921	}
922
923	emitLLVMUsed();
924	if (SanStats)
925	SanStats->finish();
926
927	if (CodeGenOpts.Autolink &&
928	(Context.getLangOpts().Modules || !LinkerOptionsMetadata.empty())) {
929	EmitModuleLinkOptions();
930	}
931
932	// On ELF we pass the dependent library specifiers directly to the linker
933	// without manipulating them. This is in contrast to other platforms where
934	// they are mapped to a specific linker option by the compiler. This
935	// difference is a result of the greater variety of ELF linkers and the fact
936	// that ELF linkers tend to handle libraries in a more complicated fashion
937	// than on other platforms. This forces us to defer handling the dependent
938	// libs to the linker.
939	//
940	// CUDA/HIP device and host libraries are different. Currently there is no
941	// way to differentiate dependent libraries for host or device. Existing
942	// usage of #pragma comment(lib, *) is intended for host libraries on
943	// Windows. Therefore emit llvm.dependent-libraries only for host.
944	if (!ELFDependentLibraries.empty() && !Context.getLangOpts().CUDAIsDevice) {
945	auto *NMD = getModule().getOrInsertNamedMetadata(Name: "llvm.dependent-libraries");
946	for (auto *MD : ELFDependentLibraries)
947	NMD->addOperand(M: MD);
948	}
949
950	// Record mregparm value now so it is visible through rest of codegen.
951	if (Context.getTargetInfo().getTriple().getArch() == llvm::Triple::x86)
952	getModule().addModuleFlag(Behavior: llvm::Module::Error, Key: "NumRegisterParameters",
953	Val: CodeGenOpts.NumRegisterParameters);
954
955	if (CodeGenOpts.DwarfVersion) {
956	getModule().addModuleFlag(Behavior: llvm::Module::Max, Key: "Dwarf Version",
957	Val: CodeGenOpts.DwarfVersion);
958	}
959
960	if (CodeGenOpts.Dwarf64)
961	getModule().addModuleFlag(Behavior: llvm::Module::Max, Key: "DWARF64", Val: 1);
962
963	if (Context.getLangOpts().SemanticInterposition)
964	// Require various optimization to respect semantic interposition.
965	getModule().setSemanticInterposition(true);
966
967	if (CodeGenOpts.EmitCodeView) {
968	// Indicate that we want CodeView in the metadata.
969	getModule().addModuleFlag(Behavior: llvm::Module::Warning, Key: "CodeView", Val: 1);
970	}
971	if (CodeGenOpts.CodeViewGHash) {
972	getModule().addModuleFlag(Behavior: llvm::Module::Warning, Key: "CodeViewGHash", Val: 1);
973	}
974	if (CodeGenOpts.ControlFlowGuard) {
975	// Function ID tables and checks for Control Flow Guard (cfguard=2).
976	getModule().addModuleFlag(Behavior: llvm::Module::Warning, Key: "cfguard", Val: 2);
977	} else if (CodeGenOpts.ControlFlowGuardNoChecks) {
978	// Function ID tables for Control Flow Guard (cfguard=1).
979	getModule().addModuleFlag(Behavior: llvm::Module::Warning, Key: "cfguard", Val: 1);
980	}
981	if (CodeGenOpts.EHContGuard) {
982	// Function ID tables for EH Continuation Guard.
983	getModule().addModuleFlag(Behavior: llvm::Module::Warning, Key: "ehcontguard", Val: 1);
984	}
985	if (Context.getLangOpts().Kernel) {
986	// Note if we are compiling with /kernel.
987	getModule().addModuleFlag(Behavior: llvm::Module::Warning, Key: "ms-kernel", Val: 1);
988	}
989	if (CodeGenOpts.OptimizationLevel > 0 && CodeGenOpts.StrictVTablePointers) {
990	// We don't support LTO with 2 with different StrictVTablePointers
991	// FIXME: we could support it by stripping all the information introduced
992	// by StrictVTablePointers.
993
994	getModule().addModuleFlag(Behavior: llvm::Module::Error, Key: "StrictVTablePointers",Val: 1);
995
996	llvm::Metadata *Ops[2] = {
997	llvm::MDString::get(Context&: VMContext, Str: "StrictVTablePointers"),
998	llvm::ConstantAsMetadata::get(C: llvm::ConstantInt::get(
999	Ty: llvm::Type::getInt32Ty(C&: VMContext), V: 1))};
1000
1001	getModule().addModuleFlag(Behavior: llvm::Module::Require,
1002	Key: "StrictVTablePointersRequirement",
1003	Val: llvm::MDNode::get(Context&: VMContext, MDs: Ops));
1004	}
1005	if (getModuleDebugInfo())
1006	// We support a single version in the linked module. The LLVM
1007	// parser will drop debug info with a different version number
1008	// (and warn about it, too).
1009	getModule().addModuleFlag(Behavior: llvm::Module::Warning, Key: "Debug Info Version",
1010	Val: llvm::DEBUG_METADATA_VERSION);
1011
1012	// We need to record the widths of enums and wchar_t, so that we can generate
1013	// the correct build attributes in the ARM backend. wchar_size is also used by
1014	// TargetLibraryInfo.
1015	uint64_t WCharWidth =
1016	Context.getTypeSizeInChars(T: Context.getWideCharType()).getQuantity();
1017	getModule().addModuleFlag(Behavior: llvm::Module::Error, Key: "wchar_size", Val: WCharWidth);
1018
1019	if (getTriple().isOSzOS()) {
1020	getModule().addModuleFlag(Behavior: llvm::Module::Warning,
1021	Key: "zos_product_major_version",
1022	Val: uint32_t(CLANG_VERSION_MAJOR));
1023	getModule().addModuleFlag(Behavior: llvm::Module::Warning,
1024	Key: "zos_product_minor_version",
1025	Val: uint32_t(CLANG_VERSION_MINOR));
1026	getModule().addModuleFlag(Behavior: llvm::Module::Warning, Key: "zos_product_patchlevel",
1027	Val: uint32_t(CLANG_VERSION_PATCHLEVEL));
1028	std::string ProductId = getClangVendor() + "clang";
1029	getModule().addModuleFlag(Behavior: llvm::Module::Error, Key: "zos_product_id",
1030	Val: llvm::MDString::get(Context&: VMContext, Str: ProductId));
1031
1032	// Record the language because we need it for the PPA2.
1033	StringRef lang_str = languageToString(
1034	L: LangStandard::getLangStandardForKind(K: LangOpts.LangStd).Language);
1035	getModule().addModuleFlag(Behavior: llvm::Module::Error, Key: "zos_cu_language",
1036	Val: llvm::MDString::get(Context&: VMContext, Str: lang_str));
1037
1038	time_t TT = PreprocessorOpts.SourceDateEpoch
1039	? *PreprocessorOpts.SourceDateEpoch
1040	: std::time(timer: nullptr);
1041	getModule().addModuleFlag(Behavior: llvm::Module::Max, Key: "zos_translation_time",
1042	Val: static_cast<uint64_t>(TT));
1043
1044	// Multiple modes will be supported here.
1045	getModule().addModuleFlag(Behavior: llvm::Module::Error, Key: "zos_le_char_mode",
1046	Val: llvm::MDString::get(Context&: VMContext, Str: "ascii"));
1047	}
1048
1049	llvm::Triple T = Context.getTargetInfo().getTriple();
1050	if (T.isARM() || T.isThumb()) {
1051	// The minimum width of an enum in bytes
1052	uint64_t EnumWidth = Context.getLangOpts().ShortEnums ? 1 : 4;
1053	getModule().addModuleFlag(Behavior: llvm::Module::Error, Key: "min_enum_size", Val: EnumWidth);
1054	}
1055
1056	if (T.isRISCV()) {
1057	StringRef ABIStr = Target.getABI();
1058	llvm::LLVMContext &Ctx = TheModule.getContext();
1059	getModule().addModuleFlag(Behavior: llvm::Module::Error, Key: "target-abi",
1060	Val: llvm::MDString::get(Context&: Ctx, Str: ABIStr));
1061
1062	// Add the canonical ISA string as metadata so the backend can set the ELF
1063	// attributes correctly. We use AppendUnique so LTO will keep all of the
1064	// unique ISA strings that were linked together.
1065	const std::vector<std::string> &Features =
1066	getTarget().getTargetOpts().Features;
1067	auto ParseResult =
1068	llvm::RISCVISAInfo::parseFeatures(XLen: T.isRISCV64() ? 64 : 32, Features);
1069	if (!errorToBool(Err: ParseResult.takeError()))
1070	getModule().addModuleFlag(
1071	Behavior: llvm::Module::AppendUnique, Key: "riscv-isa",
1072	Val: llvm::MDNode::get(
1073	Context&: Ctx, MDs: llvm::MDString::get(Context&: Ctx, Str: (*ParseResult)->toString())));
1074	}
1075
1076	if (CodeGenOpts.SanitizeCfiCrossDso) {
1077	// Indicate that we want cross-DSO control flow integrity checks.
1078	getModule().addModuleFlag(Behavior: llvm::Module::Override, Key: "Cross-DSO CFI", Val: 1);
1079	}
1080
1081	if (CodeGenOpts.WholeProgramVTables) {
1082	// Indicate whether VFE was enabled for this module, so that the
1083	// vcall_visibility metadata added under whole program vtables is handled
1084	// appropriately in the optimizer.
1085	getModule().addModuleFlag(Behavior: llvm::Module::Error, Key: "Virtual Function Elim",
1086	Val: CodeGenOpts.VirtualFunctionElimination);
1087	}
1088
1089	if (LangOpts.Sanitize.has(K: SanitizerKind::CFIICall)) {
1090	getModule().addModuleFlag(Behavior: llvm::Module::Override,
1091	Key: "CFI Canonical Jump Tables",
1092	Val: CodeGenOpts.SanitizeCfiCanonicalJumpTables);
1093	}
1094
1095	if (LangOpts.Sanitize.has(K: SanitizerKind::KCFI)) {
1096	getModule().addModuleFlag(Behavior: llvm::Module::Override, Key: "kcfi", Val: 1);
1097	// KCFI assumes patchable-function-prefix is the same for all indirectly
1098	// called functions. Store the expected offset for code generation.
1099	if (CodeGenOpts.PatchableFunctionEntryOffset)
1100	getModule().addModuleFlag(Behavior: llvm::Module::Override, Key: "kcfi-offset",
1101	Val: CodeGenOpts.PatchableFunctionEntryOffset);
1102	}
1103
1104	if (CodeGenOpts.CFProtectionReturn &&
1105	Target.checkCFProtectionReturnSupported(Diags&: getDiags())) {
1106	// Indicate that we want to instrument return control flow protection.
1107	getModule().addModuleFlag(Behavior: llvm::Module::Min, Key: "cf-protection-return",
1108	Val: 1);
1109	}
1110
1111	if (CodeGenOpts.CFProtectionBranch &&
1112	Target.checkCFProtectionBranchSupported(Diags&: getDiags())) {
1113	// Indicate that we want to instrument branch control flow protection.
1114	getModule().addModuleFlag(Behavior: llvm::Module::Min, Key: "cf-protection-branch",
1115	Val: 1);
1116	}
1117
1118	if (CodeGenOpts.FunctionReturnThunks)
1119	getModule().addModuleFlag(Behavior: llvm::Module::Override, Key: "function_return_thunk_extern", Val: 1);
1120
1121	if (CodeGenOpts.IndirectBranchCSPrefix)
1122	getModule().addModuleFlag(Behavior: llvm::Module::Override, Key: "indirect_branch_cs_prefix", Val: 1);
1123
1124	// Add module metadata for return address signing (ignoring
1125	// non-leaf/all) and stack tagging. These are actually turned on by function
1126	// attributes, but we use module metadata to emit build attributes. This is
1127	// needed for LTO, where the function attributes are inside bitcode
1128	// serialised into a global variable by the time build attributes are
1129	// emitted, so we can't access them. LTO objects could be compiled with
1130	// different flags therefore module flags are set to "Min" behavior to achieve
1131	// the same end result of the normal build where e.g BTI is off if any object
1132	// doesn't support it.
1133	if (Context.getTargetInfo().hasFeature(Feature: "ptrauth") &&
1134	LangOpts.getSignReturnAddressScope() !=
1135	LangOptions::SignReturnAddressScopeKind::None)
1136	getModule().addModuleFlag(Behavior: llvm::Module::Override,
1137	Key: "sign-return-address-buildattr", Val: 1);
1138	if (LangOpts.Sanitize.has(K: SanitizerKind::MemtagStack))
1139	getModule().addModuleFlag(Behavior: llvm::Module::Override,
1140	Key: "tag-stack-memory-buildattr", Val: 1);
1141
1142	if (T.isARM() || T.isThumb() || T.isAArch64()) {
1143	if (LangOpts.BranchTargetEnforcement)
1144	getModule().addModuleFlag(Behavior: llvm::Module::Min, Key: "branch-target-enforcement",
1145	Val: 1);
1146	if (LangOpts.BranchProtectionPAuthLR)
1147	getModule().addModuleFlag(Behavior: llvm::Module::Min, Key: "branch-protection-pauth-lr",
1148	Val: 1);
1149	if (LangOpts.GuardedControlStack)
1150	getModule().addModuleFlag(Behavior: llvm::Module::Min, Key: "guarded-control-stack", Val: 1);
1151	if (LangOpts.hasSignReturnAddress())
1152	getModule().addModuleFlag(Behavior: llvm::Module::Min, Key: "sign-return-address", Val: 1);
1153	if (LangOpts.isSignReturnAddressScopeAll())
1154	getModule().addModuleFlag(Behavior: llvm::Module::Min, Key: "sign-return-address-all",
1155	Val: 1);
1156	if (!LangOpts.isSignReturnAddressWithAKey())
1157	getModule().addModuleFlag(Behavior: llvm::Module::Min,
1158	Key: "sign-return-address-with-bkey", Val: 1);
1159	}
1160
1161	if (CodeGenOpts.StackClashProtector)
1162	getModule().addModuleFlag(
1163	Behavior: llvm::Module::Override, Key: "probe-stack",
1164	Val: llvm::MDString::get(Context&: TheModule.getContext(), Str: "inline-asm"));
1165
1166	if (CodeGenOpts.StackProbeSize && CodeGenOpts.StackProbeSize != 4096)
1167	getModule().addModuleFlag(Behavior: llvm::Module::Min, Key: "stack-probe-size",
1168	Val: CodeGenOpts.StackProbeSize);
1169
1170	if (!CodeGenOpts.MemoryProfileOutput.empty()) {
1171	llvm::LLVMContext &Ctx = TheModule.getContext();
1172	getModule().addModuleFlag(
1173	Behavior: llvm::Module::Error, Key: "MemProfProfileFilename",
1174	Val: llvm::MDString::get(Context&: Ctx, Str: CodeGenOpts.MemoryProfileOutput));
1175	}
1176
1177	if (LangOpts.CUDAIsDevice && getTriple().isNVPTX()) {
1178	// Indicate whether __nvvm_reflect should be configured to flush denormal
1179	// floating point values to 0. (This corresponds to its "__CUDA_FTZ"
1180	// property.)
1181	getModule().addModuleFlag(Behavior: llvm::Module::Override, Key: "nvvm-reflect-ftz",
1182	Val: CodeGenOpts.FP32DenormalMode.Output !=
1183	llvm::DenormalMode::IEEE);
1184	}
1185
1186	if (LangOpts.EHAsynch)
1187	getModule().addModuleFlag(Behavior: llvm::Module::Warning, Key: "eh-asynch", Val: 1);
1188
1189	// Indicate whether this Module was compiled with -fopenmp
1190	if (getLangOpts().OpenMP && !getLangOpts().OpenMPSimd)
1191	getModule().addModuleFlag(Behavior: llvm::Module::Max, Key: "openmp", Val: LangOpts.OpenMP);
1192	if (getLangOpts().OpenMPIsTargetDevice)
1193	getModule().addModuleFlag(Behavior: llvm::Module::Max, Key: "openmp-device",
1194	Val: LangOpts.OpenMP);
1195
1196	// Emit OpenCL specific module metadata: OpenCL/SPIR version.
1197	if (LangOpts.OpenCL || (LangOpts.CUDAIsDevice && getTriple().isSPIRV())) {
1198	EmitOpenCLMetadata();
1199	// Emit SPIR version.
1200	if (getTriple().isSPIR()) {
1201	// SPIR v2.0 s2.12 - The SPIR version used by the module is stored in the
1202	// opencl.spir.version named metadata.
1203	// C++ for OpenCL has a distinct mapping for version compatibility with
1204	// OpenCL.
1205	auto Version = LangOpts.getOpenCLCompatibleVersion();
1206	llvm::Metadata *SPIRVerElts[] = {
1207	llvm::ConstantAsMetadata::get(C: llvm::ConstantInt::get(
1208	Ty: Int32Ty, V: Version / 100)),
1209	llvm::ConstantAsMetadata::get(C: llvm::ConstantInt::get(
1210	Ty: Int32Ty, V: (Version / 100 > 1) ? 0 : 2))};
1211	llvm::NamedMDNode *SPIRVerMD =
1212	TheModule.getOrInsertNamedMetadata(Name: "opencl.spir.version");
1213	llvm::LLVMContext &Ctx = TheModule.getContext();
1214	SPIRVerMD->addOperand(M: llvm::MDNode::get(Context&: Ctx, MDs: SPIRVerElts));
1215	}
1216	}
1217
1218	// HLSL related end of code gen work items.
1219	if (LangOpts.HLSL)
1220	getHLSLRuntime().finishCodeGen();
1221
1222	if (uint32_t PLevel = Context.getLangOpts().PICLevel) {
1223	assert(PLevel < 3 && "Invalid PIC Level");
1224	getModule().setPICLevel(static_cast<llvm::PICLevel::Level>(PLevel));
1225	if (Context.getLangOpts().PIE)
1226	getModule().setPIELevel(static_cast<llvm::PIELevel::Level>(PLevel));
1227	}
1228
1229	if (getCodeGenOpts().CodeModel.size() > 0) {
1230	unsigned CM = llvm::StringSwitch<unsigned>(getCodeGenOpts().CodeModel)
1231	.Case(S: "tiny", Value: llvm::CodeModel::Tiny)
1232	.Case(S: "small", Value: llvm::CodeModel::Small)
1233	.Case(S: "kernel", Value: llvm::CodeModel::Kernel)
1234	.Case(S: "medium", Value: llvm::CodeModel::Medium)
1235	.Case(S: "large", Value: llvm::CodeModel::Large)
1236	.Default(Value: ~0u);
1237	if (CM != ~0u) {
1238	llvm::CodeModel::Model codeModel = static_cast<llvm::CodeModel::Model>(CM);
1239	getModule().setCodeModel(codeModel);
1240
1241	if ((CM == llvm::CodeModel::Medium || CM == llvm::CodeModel::Large) &&
1242	Context.getTargetInfo().getTriple().getArch() ==
1243	llvm::Triple::x86_64) {
1244	getModule().setLargeDataThreshold(getCodeGenOpts().LargeDataThreshold);
1245	}
1246	}
1247	}
1248
1249	if (CodeGenOpts.NoPLT)
1250	getModule().setRtLibUseGOT();
1251	if (getTriple().isOSBinFormatELF() &&
1252	CodeGenOpts.DirectAccessExternalData !=
1253	getModule().getDirectAccessExternalData()) {
1254	getModule().setDirectAccessExternalData(
1255	CodeGenOpts.DirectAccessExternalData);
1256	}
1257	if (CodeGenOpts.UnwindTables)
1258	getModule().setUwtable(llvm::UWTableKind(CodeGenOpts.UnwindTables));
1259
1260	switch (CodeGenOpts.getFramePointer()) {
1261	case CodeGenOptions::FramePointerKind::None:
1262	// 0 ("none") is the default.
1263	break;
1264	case CodeGenOptions::FramePointerKind::NonLeaf:
1265	getModule().setFramePointer(llvm::FramePointerKind::NonLeaf);
1266	break;
1267	case CodeGenOptions::FramePointerKind::All:
1268	getModule().setFramePointer(llvm::FramePointerKind::All);
1269	break;
1270	}
1271
1272	SimplifyPersonality();
1273
1274	if (getCodeGenOpts().EmitDeclMetadata)
1275	EmitDeclMetadata();
1276
1277	if (getCodeGenOpts().CoverageNotesFile.size() ||
1278	getCodeGenOpts().CoverageDataFile.size())
1279	EmitCoverageFile();
1280
1281	if (CGDebugInfo *DI = getModuleDebugInfo())
1282	DI->finalize();
1283
1284	if (getCodeGenOpts().EmitVersionIdentMetadata)
1285	EmitVersionIdentMetadata();
1286
1287	if (!getCodeGenOpts().RecordCommandLine.empty())
1288	EmitCommandLineMetadata();
1289
1290	if (!getCodeGenOpts().StackProtectorGuard.empty())
1291	getModule().setStackProtectorGuard(getCodeGenOpts().StackProtectorGuard);
1292	if (!getCodeGenOpts().StackProtectorGuardReg.empty())
1293	getModule().setStackProtectorGuardReg(
1294	getCodeGenOpts().StackProtectorGuardReg);
1295	if (!getCodeGenOpts().StackProtectorGuardSymbol.empty())
1296	getModule().setStackProtectorGuardSymbol(
1297	getCodeGenOpts().StackProtectorGuardSymbol);
1298	if (getCodeGenOpts().StackProtectorGuardOffset != INT_MAX)
1299	getModule().setStackProtectorGuardOffset(
1300	getCodeGenOpts().StackProtectorGuardOffset);
1301	if (getCodeGenOpts().StackAlignment)
1302	getModule().setOverrideStackAlignment(getCodeGenOpts().StackAlignment);
1303	if (getCodeGenOpts().SkipRaxSetup)
1304	getModule().addModuleFlag(Behavior: llvm::Module::Override, Key: "SkipRaxSetup", Val: 1);
1305	if (getLangOpts().RegCall4)
1306	getModule().addModuleFlag(Behavior: llvm::Module::Override, Key: "RegCallv4", Val: 1);
1307
1308	if (getContext().getTargetInfo().getMaxTLSAlign())
1309	getModule().addModuleFlag(Behavior: llvm::Module::Error, Key: "MaxTLSAlign",
1310	Val: getContext().getTargetInfo().getMaxTLSAlign());
1311
1312	getTargetCodeGenInfo().emitTargetGlobals(CGM&: *this);
1313
1314	getTargetCodeGenInfo().emitTargetMetadata(CGM&: *this, MangledDeclNames);
1315
1316	EmitBackendOptionsMetadata(CodeGenOpts: getCodeGenOpts());
1317
1318	// If there is device offloading code embed it in the host now.
1319	EmbedObject(M: &getModule(), CGOpts: CodeGenOpts, Diags&: getDiags());
1320
1321	// Set visibility from DLL storage class
1322	// We do this at the end of LLVM IR generation; after any operation
1323	// that might affect the DLL storage class or the visibility, and
1324	// before anything that might act on these.
1325	setVisibilityFromDLLStorageClass(LO: LangOpts, M&: getModule());
1326	}
1327
1328	void CodeGenModule::EmitOpenCLMetadata() {
1329	// SPIR v2.0 s2.13 - The OpenCL version used by the module is stored in the
1330	// opencl.ocl.version named metadata node.
1331	// C++ for OpenCL has a distinct mapping for versions compatibile with OpenCL.
1332	auto Version = LangOpts.getOpenCLCompatibleVersion();
1333	llvm::Metadata *OCLVerElts[] = {
1334	llvm::ConstantAsMetadata::get(C: llvm::ConstantInt::get(
1335	Ty: Int32Ty, V: Version / 100)),
1336	llvm::ConstantAsMetadata::get(C: llvm::ConstantInt::get(
1337	Ty: Int32Ty, V: (Version % 100) / 10))};
1338	llvm::NamedMDNode *OCLVerMD =
1339	TheModule.getOrInsertNamedMetadata(Name: "opencl.ocl.version");
1340	llvm::LLVMContext &Ctx = TheModule.getContext();
1341	OCLVerMD->addOperand(M: llvm::MDNode::get(Context&: Ctx, MDs: OCLVerElts));
1342	}
1343
1344	void CodeGenModule::EmitBackendOptionsMetadata(
1345	const CodeGenOptions &CodeGenOpts) {
1346	if (getTriple().isRISCV()) {
1347	getModule().addModuleFlag(Behavior: llvm::Module::Min, Key: "SmallDataLimit",
1348	Val: CodeGenOpts.SmallDataLimit);
1349	}
1350	}
1351
1352	void CodeGenModule::UpdateCompletedType(const TagDecl *TD) {
1353	// Make sure that this type is translated.
1354	Types.UpdateCompletedType(TD);
1355	}
1356
1357	void CodeGenModule::RefreshTypeCacheForClass(const CXXRecordDecl *RD) {
1358	// Make sure that this type is translated.
1359	Types.RefreshTypeCacheForClass(RD);
1360	}
1361
1362	llvm::MDNode *CodeGenModule::getTBAATypeInfo(QualType QTy) {
1363	if (!TBAA)
1364	return nullptr;
1365	return TBAA->getTypeInfo(QTy);
1366	}
1367
1368	TBAAAccessInfo CodeGenModule::getTBAAAccessInfo(QualType AccessType) {
1369	if (!TBAA)
1370	return TBAAAccessInfo();
1371	if (getLangOpts().CUDAIsDevice) {
1372	// As CUDA builtin surface/texture types are replaced, skip generating TBAA
1373	// access info.
1374	if (AccessType->isCUDADeviceBuiltinSurfaceType()) {
1375	if (getTargetCodeGenInfo().getCUDADeviceBuiltinSurfaceDeviceType() !=
1376	nullptr)
1377	return TBAAAccessInfo();
1378	} else if (AccessType->isCUDADeviceBuiltinTextureType()) {
1379	if (getTargetCodeGenInfo().getCUDADeviceBuiltinTextureDeviceType() !=
1380	nullptr)
1381	return TBAAAccessInfo();
1382	}
1383	}
1384	return TBAA->getAccessInfo(AccessType);
1385	}
1386
1387	TBAAAccessInfo
1388	CodeGenModule::getTBAAVTablePtrAccessInfo(llvm::Type *VTablePtrType) {
1389	if (!TBAA)
1390	return TBAAAccessInfo();
1391	return TBAA->getVTablePtrAccessInfo(VTablePtrType);
1392	}
1393
1394	llvm::MDNode *CodeGenModule::getTBAAStructInfo(QualType QTy) {
1395	if (!TBAA)
1396	return nullptr;
1397	return TBAA->getTBAAStructInfo(QTy);
1398	}
1399
1400	llvm::MDNode *CodeGenModule::getTBAABaseTypeInfo(QualType QTy) {
1401	if (!TBAA)
1402	return nullptr;
1403	return TBAA->getBaseTypeInfo(QTy);
1404	}
1405
1406	llvm::MDNode *CodeGenModule::getTBAAAccessTagInfo(TBAAAccessInfo Info) {
1407	if (!TBAA)
1408	return nullptr;
1409	return TBAA->getAccessTagInfo(Info);
1410	}
1411
1412	TBAAAccessInfo CodeGenModule::mergeTBAAInfoForCast(TBAAAccessInfo SourceInfo,
1413	TBAAAccessInfo TargetInfo) {
1414	if (!TBAA)
1415	return TBAAAccessInfo();
1416	return TBAA->mergeTBAAInfoForCast(SourceInfo, TargetInfo);
1417	}
1418
1419	TBAAAccessInfo
1420	CodeGenModule::mergeTBAAInfoForConditionalOperator(TBAAAccessInfo InfoA,
1421	TBAAAccessInfo InfoB) {
1422	if (!TBAA)
1423	return TBAAAccessInfo();
1424	return TBAA->mergeTBAAInfoForConditionalOperator(InfoA, InfoB);
1425	}
1426
1427	TBAAAccessInfo
1428	CodeGenModule::mergeTBAAInfoForMemoryTransfer(TBAAAccessInfo DestInfo,
1429	TBAAAccessInfo SrcInfo) {
1430	if (!TBAA)
1431	return TBAAAccessInfo();
1432	return TBAA->mergeTBAAInfoForConditionalOperator(InfoA: DestInfo, InfoB: SrcInfo);
1433	}
1434
1435	void CodeGenModule::DecorateInstructionWithTBAA(llvm::Instruction *Inst,
1436	TBAAAccessInfo TBAAInfo) {
1437	if (llvm::MDNode *Tag = getTBAAAccessTagInfo(Info: TBAAInfo))
1438	Inst->setMetadata(KindID: llvm::LLVMContext::MD_tbaa, Node: Tag);
1439	}
1440
1441	void CodeGenModule::DecorateInstructionWithInvariantGroup(
1442	llvm::Instruction *I, const CXXRecordDecl *RD) {
1443	I->setMetadata(KindID: llvm::LLVMContext::MD_invariant_group,
1444	Node: llvm::MDNode::get(Context&: getLLVMContext(), MDs: {}));
1445	}
1446
1447	void CodeGenModule::Error(SourceLocation loc, StringRef message) {
1448	unsigned diagID = getDiags().getCustomDiagID(L: DiagnosticsEngine::Error, FormatString: "%0");
1449	getDiags().Report(Loc: Context.getFullLoc(Loc: loc), DiagID: diagID) << message;
1450	}
1451
1452	/// ErrorUnsupported - Print out an error that codegen doesn't support the
1453	/// specified stmt yet.
1454	void CodeGenModule::ErrorUnsupported(const Stmt *S, const char *Type) {
1455	unsigned DiagID = getDiags().getCustomDiagID(L: DiagnosticsEngine::Error,
1456	FormatString: "cannot compile this %0 yet");
1457	std::string Msg = Type;
1458	getDiags().Report(Loc: Context.getFullLoc(Loc: S->getBeginLoc()), DiagID)
1459	<< Msg << S->getSourceRange();
1460	}
1461
1462	/// ErrorUnsupported - Print out an error that codegen doesn't support the
1463	/// specified decl yet.
1464	void CodeGenModule::ErrorUnsupported(const Decl *D, const char *Type) {
1465	unsigned DiagID = getDiags().getCustomDiagID(L: DiagnosticsEngine::Error,
1466	FormatString: "cannot compile this %0 yet");
1467	std::string Msg = Type;
1468	getDiags().Report(Loc: Context.getFullLoc(Loc: D->getLocation()), DiagID) << Msg;
1469	}
1470
1471	llvm::ConstantInt *CodeGenModule::getSize(CharUnits size) {
1472	return llvm::ConstantInt::get(Ty: SizeTy, V: size.getQuantity());
1473	}
1474
1475	void CodeGenModule::setGlobalVisibility(llvm::GlobalValue *GV,
1476	const NamedDecl *D) const {
1477	// Internal definitions always have default visibility.
1478	if (GV->hasLocalLinkage()) {
1479	GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
1480	return;
1481	}
1482	if (!D)
1483	return;
1484
1485	// Set visibility for definitions, and for declarations if requested globally
1486	// or set explicitly.
1487	LinkageInfo LV = D->getLinkageAndVisibility();
1488
1489	// OpenMP declare target variables must be visible to the host so they can
1490	// be registered. We require protected visibility unless the variable has
1491	// the DT_nohost modifier and does not need to be registered.
1492	if (Context.getLangOpts().OpenMP &&
1493	Context.getLangOpts().OpenMPIsTargetDevice && isa<VarDecl>(D) &&
1494	D->hasAttr<OMPDeclareTargetDeclAttr>() &&
1495	D->getAttr<OMPDeclareTargetDeclAttr>()->getDevType() !=
1496	OMPDeclareTargetDeclAttr::DT_NoHost &&
1497	LV.getVisibility() == HiddenVisibility) {
1498	GV->setVisibility(llvm::GlobalValue::ProtectedVisibility);
1499	return;
1500	}
1501
1502	if (GV->hasDLLExportStorageClass() || GV->hasDLLImportStorageClass()) {
1503	// Reject incompatible dlllstorage and visibility annotations.
1504	if (!LV.isVisibilityExplicit())
1505	return;
1506	if (GV->hasDLLExportStorageClass()) {
1507	if (LV.getVisibility() == HiddenVisibility)
1508	getDiags().Report(D->getLocation(),
1509	diag::err_hidden_visibility_dllexport);
1510	} else if (LV.getVisibility() != DefaultVisibility) {
1511	getDiags().Report(D->getLocation(),
1512	diag::err_non_default_visibility_dllimport);
1513	}
1514	return;
1515	}
1516
1517	if (LV.isVisibilityExplicit() || getLangOpts().SetVisibilityForExternDecls ||
1518	!GV->isDeclarationForLinker())
1519	GV->setVisibility(GetLLVMVisibility(V: LV.getVisibility()));
1520	}
1521
1522	static bool shouldAssumeDSOLocal(const CodeGenModule &CGM,
1523	llvm::GlobalValue *GV) {
1524	if (GV->hasLocalLinkage())
1525	return true;
1526
1527	if (!GV->hasDefaultVisibility() && !GV->hasExternalWeakLinkage())
1528	return true;
1529
1530	// DLLImport explicitly marks the GV as external.
1531	if (GV->hasDLLImportStorageClass())
1532	return false;
1533
1534	const llvm::Triple &TT = CGM.getTriple();
1535	const auto &CGOpts = CGM.getCodeGenOpts();
1536	if (TT.isWindowsGNUEnvironment()) {
1537	// In MinGW, variables without DLLImport can still be automatically
1538	// imported from a DLL by the linker; don't mark variables that
1539	// potentially could come from another DLL as DSO local.
1540
1541	// With EmulatedTLS, TLS variables can be autoimported from other DLLs
1542	// (and this actually happens in the public interface of libstdc++), so
1543	// such variables can't be marked as DSO local. (Native TLS variables
1544	// can't be dllimported at all, though.)
1545	if (GV->isDeclarationForLinker() && isa<llvm::GlobalVariable>(Val: GV) &&
1546	(!GV->isThreadLocal() || CGM.getCodeGenOpts().EmulatedTLS) &&
1547	CGOpts.AutoImport)
1548	return false;
1549	}
1550
1551	// On COFF, don't mark 'extern_weak' symbols as DSO local. If these symbols
1552	// remain unresolved in the link, they can be resolved to zero, which is
1553	// outside the current DSO.
1554	if (TT.isOSBinFormatCOFF() && GV->hasExternalWeakLinkage())
1555	return false;
1556
1557	// Every other GV is local on COFF.
1558	// Make an exception for windows OS in the triple: Some firmware builds use
1559	// *-win32-macho triples. This (accidentally?) produced windows relocations
1560	// without GOT tables in older clang versions; Keep this behaviour.
1561	// FIXME: even thread local variables?
1562	if (TT.isOSBinFormatCOFF() || (TT.isOSWindows() && TT.isOSBinFormatMachO()))
1563	return true;
1564
1565	// Only handle COFF and ELF for now.
1566	if (!TT.isOSBinFormatELF())
1567	return false;
1568
1569	// If this is not an executable, don't assume anything is local.
1570	llvm::Reloc::Model RM = CGOpts.RelocationModel;
1571	const auto &LOpts = CGM.getLangOpts();
1572	if (RM != llvm::Reloc::Static && !LOpts.PIE) {
1573	// On ELF, if -fno-semantic-interposition is specified and the target
1574	// supports local aliases, there will be neither CC1
1575	// -fsemantic-interposition nor -fhalf-no-semantic-interposition. Set
1576	// dso_local on the function if using a local alias is preferable (can avoid
1577	// PLT indirection).
1578	if (!(isa<llvm::Function>(Val: GV) && GV->canBenefitFromLocalAlias()))
1579	return false;
1580	return !(CGM.getLangOpts().SemanticInterposition ||
1581	CGM.getLangOpts().HalfNoSemanticInterposition);
1582	}
1583
1584	// A definition cannot be preempted from an executable.
1585	if (!GV->isDeclarationForLinker())
1586	return true;
1587
1588	// Most PIC code sequences that assume that a symbol is local cannot produce a
1589	// 0 if it turns out the symbol is undefined. While this is ABI and relocation
1590	// depended, it seems worth it to handle it here.
1591	if (RM == llvm::Reloc::PIC_ && GV->hasExternalWeakLinkage())
1592	return false;
1593
1594	// PowerPC64 prefers TOC indirection to avoid copy relocations.
1595	if (TT.isPPC64())
1596	return false;
1597
1598	if (CGOpts.DirectAccessExternalData) {
1599	// If -fdirect-access-external-data (default for -fno-pic), set dso_local
1600	// for non-thread-local variables. If the symbol is not defined in the
1601	// executable, a copy relocation will be needed at link time. dso_local is
1602	// excluded for thread-local variables because they generally don't support
1603	// copy relocations.
1604	if (auto *Var = dyn_cast<llvm::GlobalVariable>(Val: GV))
1605	if (!Var->isThreadLocal())
1606	return true;
1607
1608	// -fno-pic sets dso_local on a function declaration to allow direct
1609	// accesses when taking its address (similar to a data symbol). If the
1610	// function is not defined in the executable, a canonical PLT entry will be
1611	// needed at link time. -fno-direct-access-external-data can avoid the
1612	// canonical PLT entry. We don't generalize this condition to -fpie/-fpic as
1613	// it could just cause trouble without providing perceptible benefits.
1614	if (isa<llvm::Function>(Val: GV) && !CGOpts.NoPLT && RM == llvm::Reloc::Static)
1615	return true;
1616	}
1617
1618	// If we can use copy relocations we can assume it is local.
1619
1620	// Otherwise don't assume it is local.
1621	return false;
1622	}
1623
1624	void CodeGenModule::setDSOLocal(llvm::GlobalValue *GV) const {
1625	GV->setDSOLocal(shouldAssumeDSOLocal(CGM: *this, GV));
1626	}
1627
1628	void CodeGenModule::setDLLImportDLLExport(llvm::GlobalValue *GV,
1629	GlobalDecl GD) const {
1630	const auto *D = dyn_cast<NamedDecl>(Val: GD.getDecl());
1631	// C++ destructors have a few C++ ABI specific special cases.
1632	if (const auto *Dtor = dyn_cast_or_null<CXXDestructorDecl>(Val: D)) {
1633	getCXXABI().setCXXDestructorDLLStorage(GV, Dtor, DT: GD.getDtorType());
1634	return;
1635	}
1636	setDLLImportDLLExport(GV, D);
1637	}
1638
1639	void CodeGenModule::setDLLImportDLLExport(llvm::GlobalValue *GV,
1640	const NamedDecl *D) const {
1641	if (D && D->isExternallyVisible()) {
1642	if (D->hasAttr<DLLImportAttr>())
1643	GV->setDLLStorageClass(llvm::GlobalVariable::DLLImportStorageClass);
1644	else if ((D->hasAttr<DLLExportAttr>() ||
1645	shouldMapVisibilityToDLLExport(D)) &&
1646	!GV->isDeclarationForLinker())
1647	GV->setDLLStorageClass(llvm::GlobalVariable::DLLExportStorageClass);
1648	}
1649	}
1650
1651	void CodeGenModule::setGVProperties(llvm::GlobalValue *GV,
1652	GlobalDecl GD) const {
1653	setDLLImportDLLExport(GV, GD);
1654	setGVPropertiesAux(GV, D: dyn_cast<NamedDecl>(Val: GD.getDecl()));
1655	}
1656
1657	void CodeGenModule::setGVProperties(llvm::GlobalValue *GV,
1658	const NamedDecl *D) const {
1659	setDLLImportDLLExport(GV, D);
1660	setGVPropertiesAux(GV, D);
1661	}
1662
1663	void CodeGenModule::setGVPropertiesAux(llvm::GlobalValue *GV,
1664	const NamedDecl *D) const {
1665	setGlobalVisibility(GV, D);
1666	setDSOLocal(GV);
1667	GV->setPartition(CodeGenOpts.SymbolPartition);
1668	}
1669
1670	static llvm::GlobalVariable::ThreadLocalMode GetLLVMTLSModel(StringRef S) {
1671	return llvm::StringSwitch<llvm::GlobalVariable::ThreadLocalMode>(S)
1672	.Case(S: "global-dynamic", Value: llvm::GlobalVariable::GeneralDynamicTLSModel)
1673	.Case(S: "local-dynamic", Value: llvm::GlobalVariable::LocalDynamicTLSModel)
1674	.Case(S: "initial-exec", Value: llvm::GlobalVariable::InitialExecTLSModel)
1675	.Case(S: "local-exec", Value: llvm::GlobalVariable::LocalExecTLSModel);
1676	}
1677
1678	llvm::GlobalVariable::ThreadLocalMode
1679	CodeGenModule::GetDefaultLLVMTLSModel() const {
1680	switch (CodeGenOpts.getDefaultTLSModel()) {
1681	case CodeGenOptions::GeneralDynamicTLSModel:
1682	return llvm::GlobalVariable::GeneralDynamicTLSModel;
1683	case CodeGenOptions::LocalDynamicTLSModel:
1684	return llvm::GlobalVariable::LocalDynamicTLSModel;
1685	case CodeGenOptions::InitialExecTLSModel:
1686	return llvm::GlobalVariable::InitialExecTLSModel;
1687	case CodeGenOptions::LocalExecTLSModel:
1688	return llvm::GlobalVariable::LocalExecTLSModel;
1689	}
1690	llvm_unreachable("Invalid TLS model!");
1691	}
1692
1693	void CodeGenModule::setTLSMode(llvm::GlobalValue *GV, const VarDecl &D) const {
1694	assert(D.getTLSKind() && "setting TLS mode on non-TLS var!");
1695
1696	llvm::GlobalValue::ThreadLocalMode TLM;
1697	TLM = GetDefaultLLVMTLSModel();
1698
1699	// Override the TLS model if it is explicitly specified.
1700	if (const TLSModelAttr *Attr = D.getAttr<TLSModelAttr>()) {
1701	TLM = GetLLVMTLSModel(Attr->getModel());
1702	}
1703
1704	GV->setThreadLocalMode(TLM);
1705	}
1706
1707	static std::string getCPUSpecificMangling(const CodeGenModule &CGM,
1708	StringRef Name) {
1709	const TargetInfo &Target = CGM.getTarget();
1710	return (Twine('.') + Twine(Target.CPUSpecificManglingCharacter(Name))).str();
1711	}
1712
1713	static void AppendCPUSpecificCPUDispatchMangling(const CodeGenModule &CGM,
1714	const CPUSpecificAttr *Attr,
1715	unsigned CPUIndex,
1716	raw_ostream &Out) {
1717	// cpu_specific gets the current name, dispatch gets the resolver if IFunc is
1718	// supported.
1719	if (Attr)
1720	Out << getCPUSpecificMangling(CGM, Attr->getCPUName(CPUIndex)->getName());
1721	else if (CGM.getTarget().supportsIFunc())
1722	Out << ".resolver";
1723	}
1724
1725	static void AppendTargetVersionMangling(const CodeGenModule &CGM,
1726	const TargetVersionAttr *Attr,
1727	raw_ostream &Out) {
1728	if (Attr->isDefaultVersion()) {
1729	Out << ".default";
1730	return;
1731	}
1732	Out << "._";
1733	const TargetInfo &TI = CGM.getTarget();
1734	llvm::SmallVector<StringRef, 8> Feats;
1735	Attr->getFeatures(Feats);
1736	llvm::stable_sort(Range&: Feats, C: [&TI](const StringRef FeatL, const StringRef FeatR) {
1737	return TI.multiVersionSortPriority(Name: FeatL) <
1738	TI.multiVersionSortPriority(Name: FeatR);
1739	});
1740	for (const auto &Feat : Feats) {
1741	Out << 'M';
1742	Out << Feat;
1743	}
1744	}
1745
1746	static void AppendTargetMangling(const CodeGenModule &CGM,
1747	const TargetAttr *Attr, raw_ostream &Out) {
1748	if (Attr->isDefaultVersion())
1749	return;
1750
1751	Out << '.';
1752	const TargetInfo &Target = CGM.getTarget();
1753	ParsedTargetAttr Info = Target.parseTargetAttr(Str: Attr->getFeaturesStr());
1754	llvm::sort(C&: Info.Features, Comp: [&Target](StringRef LHS, StringRef RHS) {
1755	// Multiversioning doesn't allow "no-${feature}", so we can
1756	// only have "+" prefixes here.
1757	assert(LHS.starts_with("+") && RHS.starts_with("+") &&
1758	"Features should always have a prefix.");
1759	return Target.multiVersionSortPriority(Name: LHS.substr(Start: 1)) >
1760	Target.multiVersionSortPriority(Name: RHS.substr(Start: 1));
1761	});
1762
1763	bool IsFirst = true;
1764
1765	if (!Info.CPU.empty()) {
1766	IsFirst = false;
1767	Out << "arch_" << Info.CPU;
1768	}
1769
1770	for (StringRef Feat : Info.Features) {
1771	if (!IsFirst)
1772	Out << '_';
1773	IsFirst = false;
1774	Out << Feat.substr(1);
1775	}
1776	}
1777
1778	// Returns true if GD is a function decl with internal linkage and
1779	// needs a unique suffix after the mangled name.
1780	static bool isUniqueInternalLinkageDecl(GlobalDecl GD,
1781	CodeGenModule &CGM) {
1782	const Decl *D = GD.getDecl();
1783	return !CGM.getModuleNameHash().empty() && isa<FunctionDecl>(Val: D) &&
1784	(CGM.getFunctionLinkage(GD) == llvm::GlobalValue::InternalLinkage);
1785	}
1786
1787	static void AppendTargetClonesMangling(const CodeGenModule &CGM,
1788	const TargetClonesAttr *Attr,
1789	unsigned VersionIndex,
1790	raw_ostream &Out) {
1791	const TargetInfo &TI = CGM.getTarget();
1792	if (TI.getTriple().isAArch64()) {
1793	StringRef FeatureStr = Attr->getFeatureStr(VersionIndex);
1794	if (FeatureStr == "default") {
1795	Out << ".default";
1796	return;
1797	}
1798	Out << "._";
1799	SmallVector<StringRef, 8> Features;
1800	FeatureStr.split(A&: Features, Separator: "+");
1801	llvm::stable_sort(Range&: Features,
1802	C: [&TI](const StringRef FeatL, const StringRef FeatR) {
1803	return TI.multiVersionSortPriority(Name: FeatL) <
1804	TI.multiVersionSortPriority(Name: FeatR);
1805	});
1806	for (auto &Feat : Features) {
1807	Out << 'M';
1808	Out << Feat;
1809	}
1810	} else {
1811	Out << '.';
1812	StringRef FeatureStr = Attr->getFeatureStr(VersionIndex);
1813	if (FeatureStr.starts_with(Prefix: "arch="))
1814	Out << "arch_" << FeatureStr.substr(Start: sizeof("arch=") - 1);
1815	else
1816	Out << FeatureStr;
1817
1818	Out << '.' << Attr->getMangledIndex(VersionIndex);
1819	}
1820	}
1821
1822	static std::string getMangledNameImpl(CodeGenModule &CGM, GlobalDecl GD,
1823	const NamedDecl *ND,
1824	bool OmitMultiVersionMangling = false) {
1825	SmallString<256> Buffer;
1826	llvm::raw_svector_ostream Out(Buffer);
1827	MangleContext &MC = CGM.getCXXABI().getMangleContext();
1828	if (!CGM.getModuleNameHash().empty())
1829	MC.needsUniqueInternalLinkageNames();
1830	bool ShouldMangle = MC.shouldMangleDeclName(D: ND);
1831	if (ShouldMangle)
1832	MC.mangleName(GD: GD.getWithDecl(ND), Out);
1833	else {
1834	IdentifierInfo *II = ND->getIdentifier();
1835	assert(II && "Attempt to mangle unnamed decl.");
1836	const auto *FD = dyn_cast<FunctionDecl>(Val: ND);
1837
1838	if (FD &&
1839	FD->getType()->castAs<FunctionType>()->getCallConv() == CC_X86RegCall) {
1840	if (CGM.getLangOpts().RegCall4)
1841	Out << "__regcall4__" << II->getName();
1842	else
1843	Out << "__regcall3__" << II->getName();
1844	} else if (FD && FD->hasAttr<CUDAGlobalAttr>() &&
1845	GD.getKernelReferenceKind() == KernelReferenceKind::Stub) {
1846	Out << "__device_stub__" << II->getName();
1847	} else {
1848	Out << II->getName();
1849	}
1850	}
1851
1852	// Check if the module name hash should be appended for internal linkage
1853	// symbols. This should come before multi-version target suffixes are
1854	// appended. This is to keep the name and module hash suffix of the
1855	// internal linkage function together. The unique suffix should only be
1856	// added when name mangling is done to make sure that the final name can
1857	// be properly demangled. For example, for C functions without prototypes,
1858	// name mangling is not done and the unique suffix should not be appeneded
1859	// then.
1860	if (ShouldMangle && isUniqueInternalLinkageDecl(GD, CGM)) {
1861	assert(CGM.getCodeGenOpts().UniqueInternalLinkageNames &&
1862	"Hash computed when not explicitly requested");
1863	Out << CGM.getModuleNameHash();
1864	}
1865
1866	if (const auto *FD = dyn_cast<FunctionDecl>(Val: ND))
1867	if (FD->isMultiVersion() && !OmitMultiVersionMangling) {
1868	switch (FD->getMultiVersionKind()) {
1869	case MultiVersionKind::CPUDispatch:
1870	case MultiVersionKind::CPUSpecific:
1871	AppendCPUSpecificCPUDispatchMangling(CGM,
1872	FD->getAttr<CPUSpecificAttr>(),
1873	GD.getMultiVersionIndex(), Out);
1874	break;
1875	case MultiVersionKind::Target:
1876	AppendTargetMangling(CGM, FD->getAttr<TargetAttr>(), Out);
1877	break;
1878	case MultiVersionKind::TargetVersion:
1879	AppendTargetVersionMangling(CGM, FD->getAttr<TargetVersionAttr>(), Out);
1880	break;
1881	case MultiVersionKind::TargetClones:
1882	AppendTargetClonesMangling(CGM, FD->getAttr<TargetClonesAttr>(),
1883	GD.getMultiVersionIndex(), Out);
1884	break;
1885	case MultiVersionKind::None:
1886	llvm_unreachable("None multiversion type isn't valid here");
1887	}
1888	}
1889
1890	// Make unique name for device side static file-scope variable for HIP.
1891	if (CGM.getContext().shouldExternalize(ND) &&
1892	CGM.getLangOpts().GPURelocatableDeviceCode &&
1893	CGM.getLangOpts().CUDAIsDevice)
1894	CGM.printPostfixForExternalizedDecl(Out, ND);
1895
1896	return std::string(Out.str());
1897	}
1898
1899	void CodeGenModule::UpdateMultiVersionNames(GlobalDecl GD,
1900	const FunctionDecl *FD,
1901	StringRef &CurName) {
1902	if (!FD->isMultiVersion())
1903	return;
1904
1905	// Get the name of what this would be without the 'target' attribute. This
1906	// allows us to lookup the version that was emitted when this wasn't a
1907	// multiversion function.
1908	std::string NonTargetName =
1909	getMangledNameImpl(*this, GD, FD, /*OmitMultiVersionMangling=*/true);
1910	GlobalDecl OtherGD;
1911	if (lookupRepresentativeDecl(MangledName: NonTargetName, Result&: OtherGD)) {
1912	assert(OtherGD.getCanonicalDecl()
1913	.getDecl()
1914	->getAsFunction()
1915	->isMultiVersion() &&
1916	"Other GD should now be a multiversioned function");
1917	// OtherFD is the version of this function that was mangled BEFORE
1918	// becoming a MultiVersion function. It potentially needs to be updated.
1919	const FunctionDecl *OtherFD = OtherGD.getCanonicalDecl()
1920	.getDecl()
1921	->getAsFunction()
1922	->getMostRecentDecl();
1923	std::string OtherName = getMangledNameImpl(*this, OtherGD, OtherFD);
1924	// This is so that if the initial version was already the 'default'
1925	// version, we don't try to update it.
1926	if (OtherName != NonTargetName) {
1927	// Remove instead of erase, since others may have stored the StringRef
1928	// to this.
1929	const auto ExistingRecord = Manglings.find(Key: NonTargetName);
1930	if (ExistingRecord != std::end(cont&: Manglings))
1931	Manglings.remove(KeyValue: &(*ExistingRecord));
1932	auto Result = Manglings.insert(KV: std::make_pair(x&: OtherName, y&: OtherGD));
1933	StringRef OtherNameRef = MangledDeclNames[OtherGD.getCanonicalDecl()] =
1934	Result.first->first();
1935	// If this is the current decl is being created, make sure we update the name.
1936	if (GD.getCanonicalDecl() == OtherGD.getCanonicalDecl())
1937	CurName = OtherNameRef;
1938	if (llvm::GlobalValue *Entry = GetGlobalValue(Ref: NonTargetName))
1939	Entry->setName(OtherName);
1940	}
1941	}
1942	}
1943
1944	StringRef CodeGenModule::getMangledName(GlobalDecl GD) {
1945	GlobalDecl CanonicalGD = GD.getCanonicalDecl();
1946
1947	// Some ABIs don't have constructor variants. Make sure that base and
1948	// complete constructors get mangled the same.
1949	if (const auto *CD = dyn_cast<CXXConstructorDecl>(Val: CanonicalGD.getDecl())) {
1950	if (!getTarget().getCXXABI().hasConstructorVariants()) {
1951	CXXCtorType OrigCtorType = GD.getCtorType();
1952	assert(OrigCtorType == Ctor_Base || OrigCtorType == Ctor_Complete);
1953	if (OrigCtorType == Ctor_Base)
1954	CanonicalGD = GlobalDecl(CD, Ctor_Complete);
1955	}
1956	}
1957
1958	// In CUDA/HIP device compilation with -fgpu-rdc, the mangled name of a
1959	// static device variable depends on whether the variable is referenced by
1960	// a host or device host function. Therefore the mangled name cannot be
1961	// cached.
1962	if (!LangOpts.CUDAIsDevice || !getContext().mayExternalize(D: GD.getDecl())) {
1963	auto FoundName = MangledDeclNames.find(Key: CanonicalGD);
1964	if (FoundName != MangledDeclNames.end())
1965	return FoundName->second;
1966	}
1967
1968	// Keep the first result in the case of a mangling collision.
1969	const auto *ND = cast<NamedDecl>(Val: GD.getDecl());
1970	std::string MangledName = getMangledNameImpl(CGM&: *this, GD, ND);
1971
1972	// Ensure either we have different ABIs between host and device compilations,
1973	// says host compilation following MSVC ABI but device compilation follows
1974	// Itanium C++ ABI or, if they follow the same ABI, kernel names after
1975	// mangling should be the same after name stubbing. The later checking is
1976	// very important as the device kernel name being mangled in host-compilation
1977	// is used to resolve the device binaries to be executed. Inconsistent naming
1978	// result in undefined behavior. Even though we cannot check that naming
1979	// directly between host- and device-compilations, the host- and
1980	// device-mangling in host compilation could help catching certain ones.
1981	assert(!isa<FunctionDecl>(ND) || !ND->hasAttr<CUDAGlobalAttr>() ||
1982	getContext().shouldExternalize(ND) || getLangOpts().CUDAIsDevice ||
1983	(getContext().getAuxTargetInfo() &&
1984	(getContext().getAuxTargetInfo()->getCXXABI() !=
1985	getContext().getTargetInfo().getCXXABI())) ||
1986	getCUDARuntime().getDeviceSideName(ND) ==
1987	getMangledNameImpl(
1988	*this,
1989	GD.getWithKernelReferenceKind(KernelReferenceKind::Kernel),
1990	ND));
1991
1992	auto Result = Manglings.insert(KV: std::make_pair(x&: MangledName, y&: GD));
1993	return MangledDeclNames[CanonicalGD] = Result.first->first();
1994	}
1995
1996	StringRef CodeGenModule::getBlockMangledName(GlobalDecl GD,
1997	const BlockDecl *BD) {
1998	MangleContext &MangleCtx = getCXXABI().getMangleContext();
1999	const Decl *D = GD.getDecl();
2000
2001	SmallString<256> Buffer;
2002	llvm::raw_svector_ostream Out(Buffer);
2003	if (!D)
2004	MangleCtx.mangleGlobalBlock(BD,
2005	dyn_cast_or_null<VarDecl>(Val: initializedGlobalDecl.getDecl()), Out);
2006	else if (const auto *CD = dyn_cast<CXXConstructorDecl>(Val: D))
2007	MangleCtx.mangleCtorBlock(CD, CT: GD.getCtorType(), BD, Out);
2008	else if (const auto *DD = dyn_cast<CXXDestructorDecl>(Val: D))
2009	MangleCtx.mangleDtorBlock(CD: DD, DT: GD.getDtorType(), BD, Out);
2010	else
2011	MangleCtx.mangleBlock(DC: cast<DeclContext>(Val: D), BD, Out);
2012
2013	auto Result = Manglings.insert(KV: std::make_pair(x: Out.str(), y&: BD));
2014	return Result.first->first();
2015	}
2016
2017	const GlobalDecl CodeGenModule::getMangledNameDecl(StringRef Name) {
2018	auto it = MangledDeclNames.begin();
2019	while (it != MangledDeclNames.end()) {
2020	if (it->second == Name)
2021	return it->first;
2022	it++;
2023	}
2024	return GlobalDecl();
2025	}
2026
2027	llvm::GlobalValue *CodeGenModule::GetGlobalValue(StringRef Name) {
2028	return getModule().getNamedValue(Name);
2029	}
2030
2031	/// AddGlobalCtor - Add a function to the list that will be called before
2032	/// main() runs.
2033	void CodeGenModule::AddGlobalCtor(llvm::Function *Ctor, int Priority,
2034	unsigned LexOrder,
2035	llvm::Constant *AssociatedData) {
2036	// FIXME: Type coercion of void()* types.
2037	GlobalCtors.push_back(x: Structor(Priority, LexOrder, Ctor, AssociatedData));
2038	}
2039
2040	/// AddGlobalDtor - Add a function to the list that will be called
2041	/// when the module is unloaded.
2042	void CodeGenModule::AddGlobalDtor(llvm::Function *Dtor, int Priority,
2043	bool IsDtorAttrFunc) {
2044	if (CodeGenOpts.RegisterGlobalDtorsWithAtExit &&
2045	(!getContext().getTargetInfo().getTriple().isOSAIX() || IsDtorAttrFunc)) {
2046	DtorsUsingAtExit[Priority].push_back(NewVal: Dtor);
2047	return;
2048	}
2049
2050	// FIXME: Type coercion of void()* types.
2051	GlobalDtors.push_back(x: Structor(Priority, ~0U, Dtor, nullptr));
2052	}
2053
2054	void CodeGenModule::EmitCtorList(CtorList &Fns, const char *GlobalName) {
2055	if (Fns.empty()) return;
2056
2057	// Ctor function type is void()*.
2058	llvm::FunctionType* CtorFTy = llvm::FunctionType::get(Result: VoidTy, isVarArg: false);
2059	llvm::Type *CtorPFTy = llvm::PointerType::get(ElementType: CtorFTy,
2060	AddressSpace: TheModule.getDataLayout().getProgramAddressSpace());
2061
2062	// Get the type of a ctor entry, { i32, void ()*, i8* }.
2063	llvm::StructType *CtorStructTy = llvm::StructType::get(
2064	elt1: Int32Ty, elts: CtorPFTy, elts: VoidPtrTy);
2065
2066	// Construct the constructor and destructor arrays.
2067	ConstantInitBuilder builder(*this);
2068	auto ctors = builder.beginArray(eltTy: CtorStructTy);
2069	for (const auto &I : Fns) {
2070	auto ctor = ctors.beginStruct(ty: CtorStructTy);
2071	ctor.addInt(intTy: Int32Ty, value: I.Priority);
2072	ctor.add(value: I.Initializer);
2073	if (I.AssociatedData)
2074	ctor.add(value: I.AssociatedData);
2075	else
2076	ctor.addNullPointer(ptrTy: VoidPtrTy);
2077	ctor.finishAndAddTo(parent&: ctors);
2078	}
2079
2080	auto list =
2081	ctors.finishAndCreateGlobal(GlobalName, getPointerAlign(),
2082	/*constant*/ false,
2083	llvm::GlobalValue::AppendingLinkage);
2084
2085	// The LTO linker doesn't seem to like it when we set an alignment
2086	// on appending variables. Take it off as a workaround.
2087	list->setAlignment(std::nullopt);
2088
2089	Fns.clear();
2090	}
2091
2092	llvm::GlobalValue::LinkageTypes
2093	CodeGenModule::getFunctionLinkage(GlobalDecl GD) {
2094	const auto *D = cast<FunctionDecl>(Val: GD.getDecl());
2095
2096	GVALinkage Linkage = getContext().GetGVALinkageForFunction(FD: D);
2097
2098	if (const auto *Dtor = dyn_cast<CXXDestructorDecl>(Val: D))
2099	return getCXXABI().getCXXDestructorLinkage(Linkage, Dtor, DT: GD.getDtorType());
2100
2101	return getLLVMLinkageForDeclarator(D, Linkage);
2102	}
2103
2104	llvm::ConstantInt *CodeGenModule::CreateCrossDsoCfiTypeId(llvm::Metadata *MD) {
2105	llvm::MDString *MDS = dyn_cast<llvm::MDString>(Val: MD);
2106	if (!MDS) return nullptr;
2107
2108	return llvm::ConstantInt::get(Ty: Int64Ty, V: llvm::MD5Hash(Str: MDS->getString()));
2109	}
2110
2111	llvm::ConstantInt *CodeGenModule::CreateKCFITypeId(QualType T) {
2112	if (auto *FnType = T->getAs<FunctionProtoType>())
2113	T = getContext().getFunctionType(
2114	ResultTy: FnType->getReturnType(), Args: FnType->getParamTypes(),
2115	EPI: FnType->getExtProtoInfo().withExceptionSpec(ESI: EST_None));
2116
2117	std::string OutName;
2118	llvm::raw_string_ostream Out(OutName);
2119	getCXXABI().getMangleContext().mangleCanonicalTypeName(
2120	T, Out, NormalizeIntegers: getCodeGenOpts().SanitizeCfiICallNormalizeIntegers);
2121
2122	if (getCodeGenOpts().SanitizeCfiICallNormalizeIntegers)
2123	Out << ".normalized";
2124
2125	return llvm::ConstantInt::get(Ty: Int32Ty,
2126	V: static_cast<uint32_t>(llvm::xxHash64(Data: OutName)));
2127	}
2128
2129	void CodeGenModule::SetLLVMFunctionAttributes(GlobalDecl GD,
2130	const CGFunctionInfo &Info,
2131	llvm::Function *F, bool IsThunk) {
2132	unsigned CallingConv;
2133	llvm::AttributeList PAL;
2134	ConstructAttributeList(Name: F->getName(), Info, CalleeInfo: GD, Attrs&: PAL, CallingConv,
2135	/*AttrOnCallSite=*/false, IsThunk);
2136	F->setAttributes(PAL);
2137	F->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv));
2138	}
2139
2140	static void removeImageAccessQualifier(std::string& TyName) {
2141	std::string ReadOnlyQual("__read_only");
2142	std::string::size_type ReadOnlyPos = TyName.find(str: ReadOnlyQual);
2143	if (ReadOnlyPos != std::string::npos)
2144	// "+ 1" for the space after access qualifier.
2145	TyName.erase(pos: ReadOnlyPos, n: ReadOnlyQual.size() + 1);
2146	else {
2147	std::string WriteOnlyQual("__write_only");
2148	std::string::size_type WriteOnlyPos = TyName.find(str: WriteOnlyQual);
2149	if (WriteOnlyPos != std::string::npos)
2150	TyName.erase(pos: WriteOnlyPos, n: WriteOnlyQual.size() + 1);
2151	else {
2152	std::string ReadWriteQual("__read_write");
2153	std::string::size_type ReadWritePos = TyName.find(str: ReadWriteQual);
2154	if (ReadWritePos != std::string::npos)
2155	TyName.erase(pos: ReadWritePos, n: ReadWriteQual.size() + 1);
2156	}
2157	}
2158	}
2159
2160	// Returns the address space id that should be produced to the
2161	// kernel_arg_addr_space metadata. This is always fixed to the ids
2162	// as specified in the SPIR 2.0 specification in order to differentiate
2163	// for example in clGetKernelArgInfo() implementation between the address
2164	// spaces with targets without unique mapping to the OpenCL address spaces
2165	// (basically all single AS CPUs).
2166	static unsigned ArgInfoAddressSpace(LangAS AS) {
2167	switch (AS) {
2168	case LangAS::opencl_global:
2169	return 1;
2170	case LangAS::opencl_constant:
2171	return 2;
2172	case LangAS::opencl_local:
2173	return 3;
2174	case LangAS::opencl_generic:
2175	return 4; // Not in SPIR 2.0 specs.
2176	case LangAS::opencl_global_device:
2177	return 5;
2178	case LangAS::opencl_global_host:
2179	return 6;
2180	default:
2181	return 0; // Assume private.
2182	}
2183	}
2184
2185	void CodeGenModule::GenKernelArgMetadata(llvm::Function *Fn,
2186	const FunctionDecl *FD,
2187	CodeGenFunction *CGF) {
2188	assert(((FD && CGF) || (!FD && !CGF)) &&
2189	"Incorrect use - FD and CGF should either be both null or not!");
2190	// Create MDNodes that represent the kernel arg metadata.
2191	// Each MDNode is a list in the form of "key", N number of values which is
2192	// the same number of values as their are kernel arguments.
2193
2194	const PrintingPolicy &Policy = Context.getPrintingPolicy();
2195
2196	// MDNode for the kernel argument address space qualifiers.
2197	SmallVector<llvm::Metadata *, 8> addressQuals;
2198
2199	// MDNode for the kernel argument access qualifiers (images only).
2200	SmallVector<llvm::Metadata *, 8> accessQuals;
2201
2202	// MDNode for the kernel argument type names.
2203	SmallVector<llvm::Metadata *, 8> argTypeNames;
2204
2205	// MDNode for the kernel argument base type names.
2206	SmallVector<llvm::Metadata *, 8> argBaseTypeNames;
2207
2208	// MDNode for the kernel argument type qualifiers.
2209	SmallVector<llvm::Metadata *, 8> argTypeQuals;
2210
2211	// MDNode for the kernel argument names.
2212	SmallVector<llvm::Metadata *, 8> argNames;
2213
2214	if (FD && CGF)
2215	for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) {
2216	const ParmVarDecl *parm = FD->getParamDecl(i);
2217	// Get argument name.
2218	argNames.push_back(Elt: llvm::MDString::get(VMContext, parm->getName()));
2219
2220	if (!getLangOpts().OpenCL)
2221	continue;
2222	QualType ty = parm->getType();
2223	std::string typeQuals;
2224
2225	// Get image and pipe access qualifier:
2226	if (ty->isImageType() || ty->isPipeType()) {
2227	const Decl *PDecl = parm;
2228	if (const auto *TD = ty->getAs<TypedefType>())
2229	PDecl = TD->getDecl();
2230	const OpenCLAccessAttr *A = PDecl->getAttr<OpenCLAccessAttr>();
2231	if (A && A->isWriteOnly())
2232	accessQuals.push_back(Elt: llvm::MDString::get(Context&: VMContext, Str: "write_only"));
2233	else if (A && A->isReadWrite())
2234	accessQuals.push_back(Elt: llvm::MDString::get(Context&: VMContext, Str: "read_write"));
2235	else
2236	accessQuals.push_back(Elt: llvm::MDString::get(Context&: VMContext, Str: "read_only"));
2237	} else
2238	accessQuals.push_back(Elt: llvm::MDString::get(Context&: VMContext, Str: "none"));
2239
2240	auto getTypeSpelling = [&](QualType Ty) {
2241	auto typeName = Ty.getUnqualifiedType().getAsString(Policy);
2242
2243	if (Ty.isCanonical()) {
2244	StringRef typeNameRef = typeName;
2245	// Turn "unsigned type" to "utype"
2246	if (typeNameRef.consume_front(Prefix: "unsigned "))
2247	return std::string("u") + typeNameRef.str();
2248	if (typeNameRef.consume_front(Prefix: "signed "))
2249	return typeNameRef.str();
2250	}
2251
2252	return typeName;
2253	};
2254
2255	if (ty->isPointerType()) {
2256	QualType pointeeTy = ty->getPointeeType();
2257
2258	// Get address qualifier.
2259	addressQuals.push_back(
2260	Elt: llvm::ConstantAsMetadata::get(C: CGF->Builder.getInt32(
2261	C: ArgInfoAddressSpace(AS: pointeeTy.getAddressSpace()))));
2262
2263	// Get argument type name.
2264	std::string typeName = getTypeSpelling(pointeeTy) + "*";
2265	std::string baseTypeName =
2266	getTypeSpelling(pointeeTy.getCanonicalType()) + "*";
2267	argTypeNames.push_back(Elt: llvm::MDString::get(Context&: VMContext, Str: typeName));
2268	argBaseTypeNames.push_back(
2269	Elt: llvm::MDString::get(Context&: VMContext, Str: baseTypeName));
2270
2271	// Get argument type qualifiers:
2272	if (ty.isRestrictQualified())
2273	typeQuals = "restrict";
2274	if (pointeeTy.isConstQualified() ||
2275	(pointeeTy.getAddressSpace() == LangAS::opencl_constant))
2276	typeQuals += typeQuals.empty() ? "const" : " const";
2277	if (pointeeTy.isVolatileQualified())
2278	typeQuals += typeQuals.empty() ? "volatile" : " volatile";
2279	} else {
2280	uint32_t AddrSpc = 0;
2281	bool isPipe = ty->isPipeType();
2282	if (ty->isImageType() || isPipe)
2283	AddrSpc = ArgInfoAddressSpace(AS: LangAS::opencl_global);
2284
2285	addressQuals.push_back(
2286	Elt: llvm::ConstantAsMetadata::get(C: CGF->Builder.getInt32(C: AddrSpc)));
2287
2288	// Get argument type name.
2289	ty = isPipe ? ty->castAs<PipeType>()->getElementType() : ty;
2290	std::string typeName = getTypeSpelling(ty);
2291	std::string baseTypeName = getTypeSpelling(ty.getCanonicalType());
2292
2293	// Remove access qualifiers on images
2294	// (as they are inseparable from type in clang implementation,
2295	// but OpenCL spec provides a special query to get access qualifier
2296	// via clGetKernelArgInfo with CL_KERNEL_ARG_ACCESS_QUALIFIER):
2297	if (ty->isImageType()) {
2298	removeImageAccessQualifier(TyName&: typeName);
2299	removeImageAccessQualifier(TyName&: baseTypeName);
2300	}
2301
2302	argTypeNames.push_back(Elt: llvm::MDString::get(Context&: VMContext, Str: typeName));
2303	argBaseTypeNames.push_back(
2304	Elt: llvm::MDString::get(Context&: VMContext, Str: baseTypeName));
2305
2306	if (isPipe)
2307	typeQuals = "pipe";
2308	}
2309	argTypeQuals.push_back(Elt: llvm::MDString::get(Context&: VMContext, Str: typeQuals));
2310	}
2311
2312	if (getLangOpts().OpenCL) {
2313	Fn->setMetadata(Kind: "kernel_arg_addr_space",
2314	Node: llvm::MDNode::get(Context&: VMContext, MDs: addressQuals));
2315	Fn->setMetadata(Kind: "kernel_arg_access_qual",
2316	Node: llvm::MDNode::get(Context&: VMContext, MDs: accessQuals));
2317	Fn->setMetadata(Kind: "kernel_arg_type",
2318	Node: llvm::MDNode::get(Context&: VMContext, MDs: argTypeNames));
2319	Fn->setMetadata(Kind: "kernel_arg_base_type",
2320	Node: llvm::MDNode::get(Context&: VMContext, MDs: argBaseTypeNames));
2321	Fn->setMetadata(Kind: "kernel_arg_type_qual",
2322	Node: llvm::MDNode::get(Context&: VMContext, MDs: argTypeQuals));
2323	}
2324	if (getCodeGenOpts().EmitOpenCLArgMetadata ||
2325	getCodeGenOpts().HIPSaveKernelArgName)
2326	Fn->setMetadata(Kind: "kernel_arg_name",
2327	Node: llvm::MDNode::get(Context&: VMContext, MDs: argNames));
2328	}
2329
2330	/// Determines whether the language options require us to model
2331	/// unwind exceptions. We treat -fexceptions as mandating this
2332	/// except under the fragile ObjC ABI with only ObjC exceptions
2333	/// enabled. This means, for example, that C with -fexceptions
2334	/// enables this.
2335	static bool hasUnwindExceptions(const LangOptions &LangOpts) {
2336	// If exceptions are completely disabled, obviously this is false.
2337	if (!LangOpts.Exceptions) return false;
2338
2339	// If C++ exceptions are enabled, this is true.
2340	if (LangOpts.CXXExceptions) return true;
2341
2342	// If ObjC exceptions are enabled, this depends on the ABI.
2343	if (LangOpts.ObjCExceptions) {
2344	return LangOpts.ObjCRuntime.hasUnwindExceptions();
2345	}
2346
2347	return true;
2348	}
2349
2350	static bool requiresMemberFunctionPointerTypeMetadata(CodeGenModule &CGM,
2351	const CXXMethodDecl *MD) {
2352	// Check that the type metadata can ever actually be used by a call.
2353	if (!CGM.getCodeGenOpts().LTOUnit ||
2354	!CGM.HasHiddenLTOVisibility(RD: MD->getParent()))
2355	return false;
2356
2357	// Only functions whose address can be taken with a member function pointer
2358	// need this sort of type metadata.
2359	return MD->isImplicitObjectMemberFunction() && !MD->isVirtual() &&
2360	!isa<CXXConstructorDecl, CXXDestructorDecl>(Val: MD);
2361	}
2362
2363	SmallVector<const CXXRecordDecl *, 0>
2364	CodeGenModule::getMostBaseClasses(const CXXRecordDecl *RD) {
2365	llvm::SetVector<const CXXRecordDecl *> MostBases;
2366
2367	std::function<void (const CXXRecordDecl *)> CollectMostBases;
2368	CollectMostBases = [&](const CXXRecordDecl *RD) {
2369	if (RD->getNumBases() == 0)
2370	MostBases.insert(X: RD);
2371	for (const CXXBaseSpecifier &B : RD->bases())
2372	CollectMostBases(B.getType()->getAsCXXRecordDecl());
2373	};
2374	CollectMostBases(RD);
2375	return MostBases.takeVector();
2376	}
2377
2378	void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D,
2379	llvm::Function *F) {
2380	llvm::AttrBuilder B(F->getContext());
2381
2382	if ((!D || !D->hasAttr<NoUwtableAttr>()) && CodeGenOpts.UnwindTables)
2383	B.addUWTableAttr(Kind: llvm::UWTableKind(CodeGenOpts.UnwindTables));
2384
2385	if (CodeGenOpts.StackClashProtector)
2386	B.addAttribute(A: "probe-stack", V: "inline-asm");
2387
2388	if (CodeGenOpts.StackProbeSize && CodeGenOpts.StackProbeSize != 4096)
2389	B.addAttribute(A: "stack-probe-size",
2390	V: std::to_string(val: CodeGenOpts.StackProbeSize));
2391
2392	if (!hasUnwindExceptions(LangOpts))
2393	B.addAttribute(llvm::Attribute::NoUnwind);
2394
2395	if (D && D->hasAttr<NoStackProtectorAttr>())
2396	; // Do nothing.
2397	else if (D && D->hasAttr<StrictGuardStackCheckAttr>() &&
2398	isStackProtectorOn(LangOpts, getTriple(), LangOptions::SSPOn))
2399	B.addAttribute(llvm::Attribute::StackProtectStrong);
2400	else if (isStackProtectorOn(LangOpts, getTriple(), LangOptions::SSPOn))
2401	B.addAttribute(llvm::Attribute::StackProtect);
2402	else if (isStackProtectorOn(LangOpts, getTriple(), LangOptions::SSPStrong))
2403	B.addAttribute(llvm::Attribute::StackProtectStrong);
2404	else if (isStackProtectorOn(LangOpts, getTriple(), LangOptions::SSPReq))
2405	B.addAttribute(llvm::Attribute::StackProtectReq);
2406
2407	if (!D) {
2408	// If we don't have a declaration to control inlining, the function isn't
2409	// explicitly marked as alwaysinline for semantic reasons, and inlining is
2410	// disabled, mark the function as noinline.
2411	if (!F->hasFnAttribute(llvm::Attribute::AlwaysInline) &&
2412	CodeGenOpts.getInlining() == CodeGenOptions::OnlyAlwaysInlining)
2413	B.addAttribute(llvm::Attribute::NoInline);
2414
2415	F->addFnAttrs(Attrs: B);
2416	return;
2417	}
2418
2419	// Handle SME attributes that apply to function definitions,
2420	// rather than to function prototypes.
2421	if (D->hasAttr<ArmLocallyStreamingAttr>())
2422	B.addAttribute(A: "aarch64_pstate_sm_body");
2423
2424	if (auto *Attr = D->getAttr<ArmNewAttr>()) {
2425	if (Attr->isNewZA())
2426	B.addAttribute(A: "aarch64_new_za");
2427	if (Attr->isNewZT0())
2428	B.addAttribute(A: "aarch64_new_zt0");
2429	}
2430
2431	// Track whether we need to add the optnone LLVM attribute,
2432	// starting with the default for this optimization level.
2433	bool ShouldAddOptNone =
2434	!CodeGenOpts.DisableO0ImplyOptNone && CodeGenOpts.OptimizationLevel == 0;
2435	// We can't add optnone in the following cases, it won't pass the verifier.
2436	ShouldAddOptNone &= !D->hasAttr<MinSizeAttr>();
2437	ShouldAddOptNone &= !D->hasAttr<AlwaysInlineAttr>();
2438
2439	// Add optnone, but do so only if the function isn't always_inline.
2440	if ((ShouldAddOptNone || D->hasAttr<OptimizeNoneAttr>()) &&
2441	!F->hasFnAttribute(llvm::Attribute::AlwaysInline)) {
2442	B.addAttribute(llvm::Attribute::OptimizeNone);
2443
2444	// OptimizeNone implies noinline; we should not be inlining such functions.
2445	B.addAttribute(llvm::Attribute::NoInline);
2446
2447	// We still need to handle naked functions even though optnone subsumes
2448	// much of their semantics.
2449	if (D->hasAttr<NakedAttr>())
2450	B.addAttribute(llvm::Attribute::Naked);
2451
2452	// OptimizeNone wins over OptimizeForSize and MinSize.
2453	F->removeFnAttr(llvm::Attribute::OptimizeForSize);
2454	F->removeFnAttr(llvm::Attribute::MinSize);
2455	} else if (D->hasAttr<NakedAttr>()) {
2456	// Naked implies noinline: we should not be inlining such functions.
2457	B.addAttribute(llvm::Attribute::Naked);
2458	B.addAttribute(llvm::Attribute::NoInline);
2459	} else if (D->hasAttr<NoDuplicateAttr>()) {
2460	B.addAttribute(llvm::Attribute::NoDuplicate);
2461	} else if (D->hasAttr<NoInlineAttr>() && !F->hasFnAttribute(llvm::Attribute::AlwaysInline)) {
2462	// Add noinline if the function isn't always_inline.
2463	B.addAttribute(llvm::Attribute::NoInline);
2464	} else if (D->hasAttr<AlwaysInlineAttr>() &&
2465	!F->hasFnAttribute(llvm::Attribute::NoInline)) {
2466	// (noinline wins over always_inline, and we can't specify both in IR)
2467	B.addAttribute(llvm::Attribute::AlwaysInline);
2468	} else if (CodeGenOpts.getInlining() == CodeGenOptions::OnlyAlwaysInlining) {
2469	// If we're not inlining, then force everything that isn't always_inline to
2470	// carry an explicit noinline attribute.
2471	if (!F->hasFnAttribute(llvm::Attribute::AlwaysInline))
2472	B.addAttribute(llvm::Attribute::NoInline);
2473	} else {
2474	// Otherwise, propagate the inline hint attribute and potentially use its
2475	// absence to mark things as noinline.
2476	if (auto *FD = dyn_cast<FunctionDecl>(Val: D)) {
2477	// Search function and template pattern redeclarations for inline.
2478	auto CheckForInline = [](const FunctionDecl *FD) {
2479	auto CheckRedeclForInline = [](const FunctionDecl *Redecl) {
2480	return Redecl->isInlineSpecified();
2481	};
2482	if (any_of(FD->redecls(), CheckRedeclForInline))
2483	return true;
2484	const FunctionDecl *Pattern = FD->getTemplateInstantiationPattern();
2485	if (!Pattern)
2486	return false;
2487	return any_of(Pattern->redecls(), CheckRedeclForInline);
2488	};
2489	if (CheckForInline(FD)) {
2490	B.addAttribute(llvm::Attribute::InlineHint);
2491	} else if (CodeGenOpts.getInlining() ==
2492	CodeGenOptions::OnlyHintInlining &&
2493	!FD->isInlined() &&
2494	!F->hasFnAttribute(llvm::Attribute::AlwaysInline)) {
2495	B.addAttribute(llvm::Attribute::NoInline);
2496	}
2497	}
2498	}
2499
2500	// Add other optimization related attributes if we are optimizing this
2501	// function.
2502	if (!D->hasAttr<OptimizeNoneAttr>()) {
2503	if (D->hasAttr<ColdAttr>()) {
2504	if (!ShouldAddOptNone)
2505	B.addAttribute(llvm::Attribute::OptimizeForSize);
2506	B.addAttribute(llvm::Attribute::Cold);
2507	}
2508	if (D->hasAttr<HotAttr>())
2509	B.addAttribute(llvm::Attribute::Hot);
2510	if (D->hasAttr<MinSizeAttr>())
2511	B.addAttribute(llvm::Attribute::MinSize);
2512	}
2513
2514	F->addFnAttrs(Attrs: B);
2515
2516	unsigned alignment = D->getMaxAlignment() / Context.getCharWidth();
2517	if (alignment)
2518	F->setAlignment(llvm::Align(alignment));
2519
2520	if (!D->hasAttr<AlignedAttr>())
2521	if (LangOpts.FunctionAlignment)
2522	F->setAlignment(llvm::Align(1ull << LangOpts.FunctionAlignment));
2523
2524	// Some C++ ABIs require 2-byte alignment for member functions, in order to
2525	// reserve a bit for differentiating between virtual and non-virtual member
2526	// functions. If the current target's C++ ABI requires this and this is a
2527	// member function, set its alignment accordingly.
2528	if (getTarget().getCXXABI().areMemberFunctionsAligned()) {
2529	if (isa<CXXMethodDecl>(Val: D) && F->getPointerAlignment(DL: getDataLayout()) < 2)
2530	F->setAlignment(std::max(a: llvm::Align(2), b: F->getAlign().valueOrOne()));
2531	}
2532
2533	// In the cross-dso CFI mode with canonical jump tables, we want !type
2534	// attributes on definitions only.
2535	if (CodeGenOpts.SanitizeCfiCrossDso &&
2536	CodeGenOpts.SanitizeCfiCanonicalJumpTables) {
2537	if (auto *FD = dyn_cast<FunctionDecl>(Val: D)) {
2538	// Skip available_externally functions. They won't be codegen'ed in the
2539	// current module anyway.
2540	if (getContext().GetGVALinkageForFunction(FD) != GVA_AvailableExternally)
2541	CreateFunctionTypeMetadataForIcall(FD, F);
2542	}
2543	}
2544
2545	// Emit type metadata on member functions for member function pointer checks.
2546	// These are only ever necessary on definitions; we're guaranteed that the
2547	// definition will be present in the LTO unit as a result of LTO visibility.
2548	auto *MD = dyn_cast<CXXMethodDecl>(Val: D);
2549	if (MD && requiresMemberFunctionPointerTypeMetadata(CGM&: *this, MD)) {
2550	for (const CXXRecordDecl *Base : getMostBaseClasses(RD: MD->getParent())) {
2551	llvm::Metadata *Id =
2552	CreateMetadataIdentifierForType(T: Context.getMemberPointerType(
2553	T: MD->getType(), Cls: Context.getRecordType(Base).getTypePtr()));
2554	F->addTypeMetadata(Offset: 0, TypeID: Id);
2555	}
2556	}
2557	}
2558
2559	void CodeGenModule::SetCommonAttributes(GlobalDecl GD, llvm::GlobalValue *GV) {
2560	const Decl *D = GD.getDecl();
2561	if (isa_and_nonnull<NamedDecl>(Val: D))
2562	setGVProperties(GV, GD);
2563	else
2564	GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
2565
2566	if (D && D->hasAttr<UsedAttr>())
2567	addUsedOrCompilerUsedGlobal(GV);
2568
2569	if (const auto *VD = dyn_cast_if_present<VarDecl>(Val: D);
2570	VD &&
2571	((CodeGenOpts.KeepPersistentStorageVariables &&
2572	(VD->getStorageDuration() == SD_Static ||
2573	VD->getStorageDuration() == SD_Thread)) ||
2574	(CodeGenOpts.KeepStaticConsts && VD->getStorageDuration() == SD_Static &&
2575	VD->getType().isConstQualified())))
2576	addUsedOrCompilerUsedGlobal(GV);
2577	}
2578
2579	bool CodeGenModule::GetCPUAndFeaturesAttributes(GlobalDecl GD,
2580	llvm::AttrBuilder &Attrs,
2581	bool SetTargetFeatures) {
2582	// Add target-cpu and target-features attributes to functions. If
2583	// we have a decl for the function and it has a target attribute then
2584	// parse that and add it to the feature set.
2585	StringRef TargetCPU = getTarget().getTargetOpts().CPU;
2586	StringRef TuneCPU = getTarget().getTargetOpts().TuneCPU;
2587	std::vector<std::string> Features;
2588	const auto *FD = dyn_cast_or_null<FunctionDecl>(Val: GD.getDecl());
2589	FD = FD ? FD->getMostRecentDecl() : FD;
2590	const auto *TD = FD ? FD->getAttr<TargetAttr>() : nullptr;
2591	const auto *TV = FD ? FD->getAttr<TargetVersionAttr>() : nullptr;
2592	assert((!TD || !TV) && "both target_version and target specified");
2593	const auto *SD = FD ? FD->getAttr<CPUSpecificAttr>() : nullptr;
2594	const auto *TC = FD ? FD->getAttr<TargetClonesAttr>() : nullptr;
2595	bool AddedAttr = false;
2596	if (TD || TV || SD || TC) {
2597	llvm::StringMap<bool> FeatureMap;
2598	getContext().getFunctionFeatureMap(FeatureMap, GD);
2599
2600	// Produce the canonical string for this set of features.
2601	for (const llvm::StringMap<bool>::value_type &Entry : FeatureMap)
2602	Features.push_back(x: (Entry.getValue() ? "+" : "-") + Entry.getKey().str());
2603
2604	// Now add the target-cpu and target-features to the function.
2605	// While we populated the feature map above, we still need to
2606	// get and parse the target attribute so we can get the cpu for
2607	// the function.
2608	if (TD) {
2609	ParsedTargetAttr ParsedAttr =
2610	Target.parseTargetAttr(Str: TD->getFeaturesStr());
2611	if (!ParsedAttr.CPU.empty() &&
2612	getTarget().isValidCPUName(Name: ParsedAttr.CPU)) {
2613	TargetCPU = ParsedAttr.CPU;
2614	TuneCPU = ""; // Clear the tune CPU.
2615	}
2616	if (!ParsedAttr.Tune.empty() &&
2617	getTarget().isValidCPUName(Name: ParsedAttr.Tune))
2618	TuneCPU = ParsedAttr.Tune;
2619	}
2620
2621	if (SD) {
2622	// Apply the given CPU name as the 'tune-cpu' so that the optimizer can
2623	// favor this processor.
2624	TuneCPU = SD->getCPUName(GD.getMultiVersionIndex())->getName();
2625	}
2626	} else {
2627	// Otherwise just add the existing target cpu and target features to the
2628	// function.
2629	Features = getTarget().getTargetOpts().Features;
2630	}
2631
2632	if (!TargetCPU.empty()) {
2633	Attrs.addAttribute(A: "target-cpu", V: TargetCPU);
2634	AddedAttr = true;
2635	}
2636	if (!TuneCPU.empty()) {
2637	Attrs.addAttribute(A: "tune-cpu", V: TuneCPU);
2638	AddedAttr = true;
2639	}
2640	if (!Features.empty() && SetTargetFeatures) {
2641	llvm::erase_if(C&: Features, P: [&](const std::string& F) {
2642	return getTarget().isReadOnlyFeature(Feature: F.substr(pos: 1));
2643	});
2644	llvm::sort(C&: Features);
2645	Attrs.addAttribute(A: "target-features", V: llvm::join(R&: Features, Separator: ","));
2646	AddedAttr = true;
2647	}
2648
2649	return AddedAttr;
2650	}
2651
2652	void CodeGenModule::setNonAliasAttributes(GlobalDecl GD,
2653	llvm::GlobalObject *GO) {
2654	const Decl *D = GD.getDecl();
2655	SetCommonAttributes(GD, GV: GO);
2656
2657	if (D) {
2658	if (auto *GV = dyn_cast<llvm::GlobalVariable>(Val: GO)) {
2659	if (D->hasAttr<RetainAttr>())
2660	addUsedGlobal(GV);
2661	if (auto *SA = D->getAttr<PragmaClangBSSSectionAttr>())
2662	GV->addAttribute("bss-section", SA->getName());
2663	if (auto *SA = D->getAttr<PragmaClangDataSectionAttr>())
2664	GV->addAttribute("data-section", SA->getName());
2665	if (auto *SA = D->getAttr<PragmaClangRodataSectionAttr>())
2666	GV->addAttribute("rodata-section", SA->getName());
2667	if (auto *SA = D->getAttr<PragmaClangRelroSectionAttr>())
2668	GV->addAttribute("relro-section", SA->getName());
2669	}
2670
2671	if (auto *F = dyn_cast<llvm::Function>(Val: GO)) {
2672	if (D->hasAttr<RetainAttr>())
2673	addUsedGlobal(GV: F);
2674	if (auto *SA = D->getAttr<PragmaClangTextSectionAttr>())
2675	if (!D->getAttr<SectionAttr>())
2676	F->addFnAttr("implicit-section-name", SA->getName());
2677
2678	llvm::AttrBuilder Attrs(F->getContext());
2679	if (GetCPUAndFeaturesAttributes(GD, Attrs)) {
2680	// We know that GetCPUAndFeaturesAttributes will always have the
2681	// newest set, since it has the newest possible FunctionDecl, so the
2682	// new ones should replace the old.
2683	llvm::AttributeMask RemoveAttrs;
2684	RemoveAttrs.addAttribute(A: "target-cpu");
2685	RemoveAttrs.addAttribute(A: "target-features");
2686	RemoveAttrs.addAttribute(A: "tune-cpu");
2687	F->removeFnAttrs(Attrs: RemoveAttrs);
2688	F->addFnAttrs(Attrs);
2689	}
2690	}
2691
2692	if (const auto *CSA = D->getAttr<CodeSegAttr>())
2693	GO->setSection(CSA->getName());
2694	else if (const auto *SA = D->getAttr<SectionAttr>())
2695	GO->setSection(SA->getName());
2696	}
2697
2698	getTargetCodeGenInfo().setTargetAttributes(D, GV: GO, M&: *this);
2699	}
2700
2701	void CodeGenModule::SetInternalFunctionAttributes(GlobalDecl GD,
2702	llvm::Function *F,
2703	const CGFunctionInfo &FI) {
2704	const Decl *D = GD.getDecl();
2705	SetLLVMFunctionAttributes(GD, Info: FI, F, /*IsThunk=*/false);
2706	SetLLVMFunctionAttributesForDefinition(D, F);
2707
2708	F->setLinkage(llvm::Function::InternalLinkage);
2709
2710	setNonAliasAttributes(GD, GO: F);
2711	}
2712
2713	static void setLinkageForGV(llvm::GlobalValue *GV, const NamedDecl *ND) {
2714	// Set linkage and visibility in case we never see a definition.
2715	LinkageInfo LV = ND->getLinkageAndVisibility();
2716	// Don't set internal linkage on declarations.
2717	// "extern_weak" is overloaded in LLVM; we probably should have
2718	// separate linkage types for this.
2719	if (isExternallyVisible(LV.getLinkage()) &&
2720	(ND->hasAttr<WeakAttr>() || ND->isWeakImported()))
2721	GV->setLinkage(llvm::GlobalValue::ExternalWeakLinkage);
2722	}
2723
2724	void CodeGenModule::CreateFunctionTypeMetadataForIcall(const FunctionDecl *FD,
2725	llvm::Function *F) {
2726	// Only if we are checking indirect calls.
2727	if (!LangOpts.Sanitize.has(K: SanitizerKind::CFIICall))
2728	return;
2729
2730	// Non-static class methods are handled via vtable or member function pointer
2731	// checks elsewhere.
2732	if (isa<CXXMethodDecl>(Val: FD) && !cast<CXXMethodDecl>(Val: FD)->isStatic())
2733	return;
2734
2735	llvm::Metadata *MD = CreateMetadataIdentifierForType(T: FD->getType());
2736	F->addTypeMetadata(Offset: 0, TypeID: MD);
2737	F->addTypeMetadata(Offset: 0, TypeID: CreateMetadataIdentifierGeneralized(T: FD->getType()));
2738
2739	// Emit a hash-based bit set entry for cross-DSO calls.
2740	if (CodeGenOpts.SanitizeCfiCrossDso)
2741	if (auto CrossDsoTypeId = CreateCrossDsoCfiTypeId(MD))
2742	F->addTypeMetadata(Offset: 0, TypeID: llvm::ConstantAsMetadata::get(C: CrossDsoTypeId));
2743	}
2744
2745	void CodeGenModule::setKCFIType(const FunctionDecl *FD, llvm::Function *F) {
2746	llvm::LLVMContext &Ctx = F->getContext();
2747	llvm::MDBuilder MDB(Ctx);
2748	F->setMetadata(llvm::LLVMContext::MD_kcfi_type,
2749	llvm::MDNode::get(
2750	Context&: Ctx, MDs: MDB.createConstant(C: CreateKCFITypeId(T: FD->getType()))));
2751	}
2752
2753	static bool allowKCFIIdentifier(StringRef Name) {
2754	// KCFI type identifier constants are only necessary for external assembly
2755	// functions, which means it's safe to skip unusual names. Subset of
2756	// MCAsmInfo::isAcceptableChar() and MCAsmInfoXCOFF::isAcceptableChar().
2757	return llvm::all_of(Range&: Name, P: [](const char &C) {
2758	return llvm::isAlnum(C) || C == '_' || C == '.';
2759	});
2760	}
2761
2762	void CodeGenModule::finalizeKCFITypes() {
2763	llvm::Module &M = getModule();
2764	for (auto &F : M.functions()) {
2765	// Remove KCFI type metadata from non-address-taken local functions.
2766	bool AddressTaken = F.hasAddressTaken();
2767	if (!AddressTaken && F.hasLocalLinkage())
2768	F.eraseMetadata(KindID: llvm::LLVMContext::MD_kcfi_type);
2769
2770	// Generate a constant with the expected KCFI type identifier for all
2771	// address-taken function declarations to support annotating indirectly
2772	// called assembly functions.
2773	if (!AddressTaken || !F.isDeclaration())
2774	continue;
2775
2776	const llvm::ConstantInt *Type;
2777	if (const llvm::MDNode *MD = F.getMetadata(KindID: llvm::LLVMContext::MD_kcfi_type))
2778	Type = llvm::mdconst::extract<llvm::ConstantInt>(MD: MD->getOperand(I: 0));
2779	else
2780	continue;
2781
2782	StringRef Name = F.getName();
2783	if (!allowKCFIIdentifier(Name))
2784	continue;
2785
2786	std::string Asm = (".weak __kcfi_typeid_" + Name + "\n.set __kcfi_typeid_" +
2787	Name + ", " + Twine(Type->getZExtValue()) + "\n")
2788	.str();
2789	M.appendModuleInlineAsm(Asm);
2790	}
2791	}
2792
2793	void CodeGenModule::SetFunctionAttributes(GlobalDecl GD, llvm::Function *F,
2794	bool IsIncompleteFunction,
2795	bool IsThunk) {
2796
2797	if (llvm::Intrinsic::ID IID = F->getIntrinsicID()) {
2798	// If this is an intrinsic function, set the function's attributes
2799	// to the intrinsic's attributes.
2800	F->setAttributes(llvm::Intrinsic::getAttributes(C&: getLLVMContext(), id: IID));
2801	return;
2802	}
2803
2804	const auto *FD = cast<FunctionDecl>(Val: GD.getDecl());
2805
2806	if (!IsIncompleteFunction)
2807	SetLLVMFunctionAttributes(GD, Info: getTypes().arrangeGlobalDeclaration(GD), F,
2808	IsThunk);
2809
2810	// Add the Returned attribute for "this", except for iOS 5 and earlier
2811	// where substantial code, including the libstdc++ dylib, was compiled with
2812	// GCC and does not actually return "this".
2813	if (!IsThunk && getCXXABI().HasThisReturn(GD) &&
2814	!(getTriple().isiOS() && getTriple().isOSVersionLT(Major: 6))) {
2815	assert(!F->arg_empty() &&
2816	F->arg_begin()->getType()
2817	->canLosslesslyBitCastTo(F->getReturnType()) &&
2818	"unexpected this return");
2819	F->addParamAttr(0, llvm::Attribute::Returned);
2820	}
2821
2822	// Only a few attributes are set on declarations; these may later be
2823	// overridden by a definition.
2824
2825	setLinkageForGV(F, FD);
2826	setGVProperties(GV: F, GD: FD);
2827
2828	// Setup target-specific attributes.
2829	if (!IsIncompleteFunction && F->isDeclaration())
2830	getTargetCodeGenInfo().setTargetAttributes(FD, F, *this);
2831
2832	if (const auto *CSA = FD->getAttr<CodeSegAttr>())
2833	F->setSection(CSA->getName());
2834	else if (const auto *SA = FD->getAttr<SectionAttr>())
2835	F->setSection(SA->getName());
2836
2837	if (const auto *EA = FD->getAttr<ErrorAttr>()) {
2838	if (EA->isError())
2839	F->addFnAttr("dontcall-error", EA->getUserDiagnostic());
2840	else if (EA->isWarning())
2841	F->addFnAttr("dontcall-warn", EA->getUserDiagnostic());
2842	}
2843
2844	// If we plan on emitting this inline builtin, we can't treat it as a builtin.
2845	if (FD->isInlineBuiltinDeclaration()) {
2846	const FunctionDecl *FDBody;
2847	bool HasBody = FD->hasBody(Definition&: FDBody);
2848	(void)HasBody;
2849	assert(HasBody && "Inline builtin declarations should always have an "
2850	"available body!");
2851	if (shouldEmitFunction(FDBody))
2852	F->addFnAttr(llvm::Attribute::NoBuiltin);
2853	}
2854
2855	if (FD->isReplaceableGlobalAllocationFunction()) {
2856	// A replaceable global allocation function does not act like a builtin by
2857	// default, only if it is invoked by a new-expression or delete-expression.
2858	F->addFnAttr(llvm::Attribute::NoBuiltin);
2859	}
2860
2861	if (isa<CXXConstructorDecl>(Val: FD) || isa<CXXDestructorDecl>(Val: FD))
2862	F->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
2863	else if (const auto *MD = dyn_cast<CXXMethodDecl>(Val: FD))
2864	if (MD->isVirtual())
2865	F->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
2866
2867	// Don't emit entries for function declarations in the cross-DSO mode. This
2868	// is handled with better precision by the receiving DSO. But if jump tables
2869	// are non-canonical then we need type metadata in order to produce the local
2870	// jump table.
2871	if (!CodeGenOpts.SanitizeCfiCrossDso ||
2872	!CodeGenOpts.SanitizeCfiCanonicalJumpTables)
2873	CreateFunctionTypeMetadataForIcall(FD, F);
2874
2875	if (LangOpts.Sanitize.has(K: SanitizerKind::KCFI))
2876	setKCFIType(FD, F);
2877
2878	if (getLangOpts().OpenMP && FD->hasAttr<OMPDeclareSimdDeclAttr>())
2879	getOpenMPRuntime().emitDeclareSimdFunction(FD, Fn: F);
2880
2881	if (CodeGenOpts.InlineMaxStackSize != UINT_MAX)
2882	F->addFnAttr(Kind: "inline-max-stacksize", Val: llvm::utostr(X: CodeGenOpts.InlineMaxStackSize));
2883
2884	if (const auto *CB = FD->getAttr<CallbackAttr>()) {
2885	// Annotate the callback behavior as metadata:
2886	// - The callback callee (as argument number).
2887	// - The callback payloads (as argument numbers).
2888	llvm::LLVMContext &Ctx = F->getContext();
2889	llvm::MDBuilder MDB(Ctx);
2890
2891	// The payload indices are all but the first one in the encoding. The first
2892	// identifies the callback callee.
2893	int CalleeIdx = *CB->encoding_begin();
2894	ArrayRef<int> PayloadIndices(CB->encoding_begin() + 1, CB->encoding_end());
2895	F->addMetadata(KindID: llvm::LLVMContext::MD_callback,
2896	MD&: *llvm::MDNode::get(Context&: Ctx, MDs: {MDB.createCallbackEncoding(
2897	CalleeArgNo: CalleeIdx, Arguments: PayloadIndices,
2898	/* VarArgsArePassed */ false)}));
2899	}
2900	}
2901
2902	void CodeGenModule::addUsedGlobal(llvm::GlobalValue *GV) {
2903	assert((isa<llvm::Function>(GV) || !GV->isDeclaration()) &&
2904	"Only globals with definition can force usage.");
2905	LLVMUsed.emplace_back(args&: GV);
2906	}
2907
2908	void CodeGenModule::addCompilerUsedGlobal(llvm::GlobalValue *GV) {
2909	assert(!GV->isDeclaration() &&
2910	"Only globals with definition can force usage.");
2911	LLVMCompilerUsed.emplace_back(args&: GV);
2912	}
2913
2914	void CodeGenModule::addUsedOrCompilerUsedGlobal(llvm::GlobalValue *GV) {
2915	assert((isa<llvm::Function>(GV) || !GV->isDeclaration()) &&
2916	"Only globals with definition can force usage.");
2917	if (getTriple().isOSBinFormatELF())
2918	LLVMCompilerUsed.emplace_back(args&: GV);
2919	else
2920	LLVMUsed.emplace_back(args&: GV);
2921	}
2922
2923	static void emitUsed(CodeGenModule &CGM, StringRef Name,
2924	std::vector<llvm::WeakTrackingVH> &List) {
2925	// Don't create llvm.used if there is no need.
2926	if (List.empty())
2927	return;
2928
2929	// Convert List to what ConstantArray needs.
2930	SmallVector<llvm::Constant*, 8> UsedArray;
2931	UsedArray.resize(N: List.size());
2932	for (unsigned i = 0, e = List.size(); i != e; ++i) {
2933	UsedArray[i] =
2934	llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(
2935	C: cast<llvm::Constant>(Val: &*List[i]), Ty: CGM.Int8PtrTy);
2936	}
2937
2938	if (UsedArray.empty())
2939	return;
2940	llvm::ArrayType *ATy = llvm::ArrayType::get(ElementType: CGM.Int8PtrTy, NumElements: UsedArray.size());
2941
2942	auto *GV = new llvm::GlobalVariable(
2943	CGM.getModule(), ATy, false, llvm::GlobalValue::AppendingLinkage,
2944	llvm::ConstantArray::get(T: ATy, V: UsedArray), Name);
2945
2946	GV->setSection("llvm.metadata");
2947	}
2948
2949	void CodeGenModule::emitLLVMUsed() {
2950	emitUsed(CGM&: *this, Name: "llvm.used", List&: LLVMUsed);
2951	emitUsed(CGM&: *this, Name: "llvm.compiler.used", List&: LLVMCompilerUsed);
2952	}
2953
2954	void CodeGenModule::AppendLinkerOptions(StringRef Opts) {
2955	auto *MDOpts = llvm::MDString::get(Context&: getLLVMContext(), Str: Opts);
2956	LinkerOptionsMetadata.push_back(Elt: llvm::MDNode::get(Context&: getLLVMContext(), MDs: MDOpts));
2957	}
2958
2959	void CodeGenModule::AddDetectMismatch(StringRef Name, StringRef Value) {
2960	llvm::SmallString<32> Opt;
2961	getTargetCodeGenInfo().getDetectMismatchOption(Name, Value, Opt);
2962	if (Opt.empty())
2963	return;
2964	auto *MDOpts = llvm::MDString::get(Context&: getLLVMContext(), Str: Opt);
2965	LinkerOptionsMetadata.push_back(Elt: llvm::MDNode::get(Context&: getLLVMContext(), MDs: MDOpts));
2966	}
2967
2968	void CodeGenModule::AddDependentLib(StringRef Lib) {
2969	auto &C = getLLVMContext();
2970	if (getTarget().getTriple().isOSBinFormatELF()) {
2971	ELFDependentLibraries.push_back(
2972	Elt: llvm::MDNode::get(Context&: C, MDs: llvm::MDString::get(Context&: C, Str: Lib)));
2973	return;
2974	}
2975
2976	llvm::SmallString<24> Opt;
2977	getTargetCodeGenInfo().getDependentLibraryOption(Lib, Opt);
2978	auto *MDOpts = llvm::MDString::get(Context&: getLLVMContext(), Str: Opt);
2979	LinkerOptionsMetadata.push_back(Elt: llvm::MDNode::get(Context&: C, MDs: MDOpts));
2980	}
2981
2982	/// Add link options implied by the given module, including modules
2983	/// it depends on, using a postorder walk.
2984	static void addLinkOptionsPostorder(CodeGenModule &CGM, Module *Mod,
2985	SmallVectorImpl<llvm::MDNode *> &Metadata,
2986	llvm::SmallPtrSet<Module *, 16> &Visited) {
2987	// Import this module's parent.
2988	if (Mod->Parent && Visited.insert(Ptr: Mod->Parent).second) {
2989	addLinkOptionsPostorder(CGM, Mod: Mod->Parent, Metadata, Visited);
2990	}
2991
2992	// Import this module's dependencies.
2993	for (Module *Import : llvm::reverse(C&: Mod->Imports)) {
2994	if (Visited.insert(Ptr: Import).second)
2995	addLinkOptionsPostorder(CGM, Mod: Import, Metadata, Visited);
2996	}
2997
2998	// Add linker options to link against the libraries/frameworks
2999	// described by this module.
3000	llvm::LLVMContext &Context = CGM.getLLVMContext();
3001	bool IsELF = CGM.getTarget().getTriple().isOSBinFormatELF();
3002
3003	// For modules that use export_as for linking, use that module
3004	// name instead.
3005	if (Mod->UseExportAsModuleLinkName)
3006	return;
3007
3008	for (const Module::LinkLibrary &LL : llvm::reverse(C&: Mod->LinkLibraries)) {
3009	// Link against a framework. Frameworks are currently Darwin only, so we
3010	// don't to ask TargetCodeGenInfo for the spelling of the linker option.
3011	if (LL.IsFramework) {
3012	llvm::Metadata *Args[2] = {llvm::MDString::get(Context, Str: "-framework"),
3013	llvm::MDString::get(Context, Str: LL.Library)};
3014
3015	Metadata.push_back(Elt: llvm::MDNode::get(Context, MDs: Args));
3016	continue;
3017	}
3018
3019	// Link against a library.
3020	if (IsELF) {
3021	llvm::Metadata *Args[2] = {
3022	llvm::MDString::get(Context, Str: "lib"),
3023	llvm::MDString::get(Context, Str: LL.Library),
3024	};
3025	Metadata.push_back(Elt: llvm::MDNode::get(Context, MDs: Args));
3026	} else {
3027	llvm::SmallString<24> Opt;
3028	CGM.getTargetCodeGenInfo().getDependentLibraryOption(Lib: LL.Library, Opt);
3029	auto *OptString = llvm::MDString::get(Context, Str: Opt);
3030	Metadata.push_back(Elt: llvm::MDNode::get(Context, MDs: OptString));
3031	}
3032	}
3033	}
3034
3035	void CodeGenModule::EmitModuleInitializers(clang::Module *Primary) {
3036	assert(Primary->isNamedModuleUnit() &&
3037	"We should only emit module initializers for named modules.");
3038
3039	// Emit the initializers in the order that sub-modules appear in the
3040	// source, first Global Module Fragments, if present.
3041	if (auto GMF = Primary->getGlobalModuleFragment()) {
3042	for (Decl *D : getContext().getModuleInitializers(M: GMF)) {
3043	if (isa<ImportDecl>(Val: D))
3044	continue;
3045	assert(isa<VarDecl>(D) && "GMF initializer decl is not a var?");
3046	EmitTopLevelDecl(D);
3047	}
3048	}
3049	// Second any associated with the module, itself.
3050	for (Decl *D : getContext().getModuleInitializers(M: Primary)) {
3051	// Skip import decls, the inits for those are called explicitly.
3052	if (isa<ImportDecl>(Val: D))
3053	continue;
3054	EmitTopLevelDecl(D);
3055	}
3056	// Third any associated with the Privat eMOdule Fragment, if present.
3057	if (auto PMF = Primary->getPrivateModuleFragment()) {
3058	for (Decl *D : getContext().getModuleInitializers(M: PMF)) {
3059	// Skip import decls, the inits for those are called explicitly.
3060	if (isa<ImportDecl>(Val: D))
3061	continue;
3062	assert(isa<VarDecl>(D) && "PMF initializer decl is not a var?");
3063	EmitTopLevelDecl(D);
3064	}
3065	}
3066	}
3067
3068	void CodeGenModule::EmitModuleLinkOptions() {
3069	// Collect the set of all of the modules we want to visit to emit link
3070	// options, which is essentially the imported modules and all of their
3071	// non-explicit child modules.
3072	llvm::SetVector<clang::Module *> LinkModules;
3073	llvm::SmallPtrSet<clang::Module *, 16> Visited;
3074	SmallVector<clang::Module *, 16> Stack;
3075
3076	// Seed the stack with imported modules.
3077	for (Module *M : ImportedModules) {
3078	// Do not add any link flags when an implementation TU of a module imports
3079	// a header of that same module.
3080	if (M->getTopLevelModuleName() == getLangOpts().CurrentModule &&
3081	!getLangOpts().isCompilingModule())
3082	continue;
3083	if (Visited.insert(Ptr: M).second)
3084	Stack.push_back(Elt: M);
3085	}
3086
3087	// Find all of the modules to import, making a little effort to prune
3088	// non-leaf modules.
3089	while (!Stack.empty()) {
3090	clang::Module *Mod = Stack.pop_back_val();
3091
3092	bool AnyChildren = false;
3093
3094	// Visit the submodules of this module.
3095	for (const auto &SM : Mod->submodules()) {
3096	// Skip explicit children; they need to be explicitly imported to be
3097	// linked against.
3098	if (SM->IsExplicit)
3099	continue;
3100
3101	if (Visited.insert(Ptr: SM).second) {
3102	Stack.push_back(Elt: SM);
3103	AnyChildren = true;
3104	}
3105	}
3106
3107	// We didn't find any children, so add this module to the list of
3108	// modules to link against.
3109	if (!AnyChildren) {
3110	LinkModules.insert(X: Mod);
3111	}
3112	}
3113
3114	// Add link options for all of the imported modules in reverse topological
3115	// order. We don't do anything to try to order import link flags with respect
3116	// to linker options inserted by things like #pragma comment().
3117	SmallVector<llvm::MDNode *, 16> MetadataArgs;
3118	Visited.clear();
3119	for (Module *M : LinkModules)
3120	if (Visited.insert(Ptr: M).second)
3121	addLinkOptionsPostorder(CGM&: *this, Mod: M, Metadata&: MetadataArgs, Visited);
3122	std::reverse(first: MetadataArgs.begin(), last: MetadataArgs.end());
3123	LinkerOptionsMetadata.append(in_start: MetadataArgs.begin(), in_end: MetadataArgs.end());
3124
3125	// Add the linker options metadata flag.
3126	auto *NMD = getModule().getOrInsertNamedMetadata(Name: "llvm.linker.options");
3127	for (auto *MD : LinkerOptionsMetadata)
3128	NMD->addOperand(M: MD);
3129	}
3130
3131	void CodeGenModule::EmitDeferred() {
3132	// Emit deferred declare target declarations.
3133	if (getLangOpts().OpenMP && !getLangOpts().OpenMPSimd)
3134	getOpenMPRuntime().emitDeferredTargetDecls();
3135
3136	// Emit code for any potentially referenced deferred decls. Since a
3137	// previously unused static decl may become used during the generation of code
3138	// for a static function, iterate until no changes are made.
3139
3140	if (!DeferredVTables.empty()) {
3141	EmitDeferredVTables();
3142
3143	// Emitting a vtable doesn't directly cause more vtables to
3144	// become deferred, although it can cause functions to be
3145	// emitted that then need those vtables.
3146	assert(DeferredVTables.empty());
3147	}
3148
3149	// Emit CUDA/HIP static device variables referenced by host code only.
3150	// Note we should not clear CUDADeviceVarODRUsedByHost since it is still
3151	// needed for further handling.
3152	if (getLangOpts().CUDA && getLangOpts().CUDAIsDevice)
3153	llvm::append_range(C&: DeferredDeclsToEmit,
3154	R&: getContext().CUDADeviceVarODRUsedByHost);
3155
3156	// Stop if we're out of both deferred vtables and deferred declarations.
3157	if (DeferredDeclsToEmit.empty())
3158	return;
3159
3160	// Grab the list of decls to emit. If EmitGlobalDefinition schedules more
3161	// work, it will not interfere with this.
3162	std::vector<GlobalDecl> CurDeclsToEmit;
3163	CurDeclsToEmit.swap(x&: DeferredDeclsToEmit);
3164
3165	for (GlobalDecl &D : CurDeclsToEmit) {
3166	// We should call GetAddrOfGlobal with IsForDefinition set to true in order
3167	// to get GlobalValue with exactly the type we need, not something that
3168	// might had been created for another decl with the same mangled name but
3169	// different type.
3170	llvm::GlobalValue *GV = dyn_cast<llvm::GlobalValue>(
3171	Val: GetAddrOfGlobal(GD: D, IsForDefinition: ForDefinition));
3172
3173	// In case of different address spaces, we may still get a cast, even with
3174	// IsForDefinition equal to true. Query mangled names table to get
3175	// GlobalValue.
3176	if (!GV)
3177	GV = GetGlobalValue(Name: getMangledName(GD: D));
3178
3179	// Make sure GetGlobalValue returned non-null.
3180	assert(GV);
3181
3182	// Check to see if we've already emitted this. This is necessary
3183	// for a couple of reasons: first, decls can end up in the
3184	// deferred-decls queue multiple times, and second, decls can end
3185	// up with definitions in unusual ways (e.g. by an extern inline
3186	// function acquiring a strong function redefinition). Just
3187	// ignore these cases.
3188	if (!GV->isDeclaration())
3189	continue;
3190
3191	// If this is OpenMP, check if it is legal to emit this global normally.
3192	if (LangOpts.OpenMP && OpenMPRuntime && OpenMPRuntime->emitTargetGlobal(GD: D))
3193	continue;
3194
3195	// Otherwise, emit the definition and move on to the next one.
3196	EmitGlobalDefinition(D, GV);
3197
3198	// If we found out that we need to emit more decls, do that recursively.
3199	// This has the advantage that the decls are emitted in a DFS and related
3200	// ones are close together, which is convenient for testing.
3201	if (!DeferredVTables.empty() || !DeferredDeclsToEmit.empty()) {
3202	EmitDeferred();
3203	assert(DeferredVTables.empty() && DeferredDeclsToEmit.empty());
3204	}
3205	}
3206	}
3207
3208	void CodeGenModule::EmitVTablesOpportunistically() {
3209	// Try to emit external vtables as available_externally if they have emitted
3210	// all inlined virtual functions. It runs after EmitDeferred() and therefore
3211	// is not allowed to create new references to things that need to be emitted
3212	// lazily. Note that it also uses fact that we eagerly emitting RTTI.
3213
3214	assert((OpportunisticVTables.empty() || shouldOpportunisticallyEmitVTables())
3215	&& "Only emit opportunistic vtables with optimizations");
3216
3217	for (const CXXRecordDecl *RD : OpportunisticVTables) {
3218	assert(getVTables().isVTableExternal(RD) &&
3219	"This queue should only contain external vtables");
3220	if (getCXXABI().canSpeculativelyEmitVTable(RD))
3221	VTables.GenerateClassData(RD);
3222	}
3223	OpportunisticVTables.clear();
3224	}
3225
3226	void CodeGenModule::EmitGlobalAnnotations() {
3227	for (const auto& [MangledName, VD] : DeferredAnnotations) {
3228	llvm::GlobalValue *GV = GetGlobalValue(Name: MangledName);
3229	if (GV)
3230	AddGlobalAnnotations(D: VD, GV);
3231	}
3232	DeferredAnnotations.clear();
3233
3234	if (Annotations.empty())
3235	return;
3236
3237	// Create a new global variable for the ConstantStruct in the Module.
3238	llvm::Constant *Array = llvm::ConstantArray::get(T: llvm::ArrayType::get(
3239	ElementType: Annotations[0]->getType(), NumElements: Annotations.size()), V: Annotations);
3240	auto *gv = new llvm::GlobalVariable(getModule(), Array->getType(), false,
3241	llvm::GlobalValue::AppendingLinkage,
3242	Array, "llvm.global.annotations");
3243	gv->setSection(AnnotationSection);
3244	}
3245
3246	llvm::Constant *CodeGenModule::EmitAnnotationString(StringRef Str) {
3247	llvm::Constant *&AStr = AnnotationStrings[Str];
3248	if (AStr)
3249	return AStr;
3250
3251	// Not found yet, create a new global.
3252	llvm::Constant *s = llvm::ConstantDataArray::getString(Context&: getLLVMContext(), Initializer: Str);
3253	auto *gv = new llvm::GlobalVariable(
3254	getModule(), s->getType(), true, llvm::GlobalValue::PrivateLinkage, s,
3255	".str", nullptr, llvm::GlobalValue::NotThreadLocal,
3256	ConstGlobalsPtrTy->getAddressSpace());
3257	gv->setSection(AnnotationSection);
3258	gv->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
3259	AStr = gv;
3260	return gv;
3261	}
3262
3263	llvm::Constant *CodeGenModule::EmitAnnotationUnit(SourceLocation Loc) {
3264	SourceManager &SM = getContext().getSourceManager();
3265	PresumedLoc PLoc = SM.getPresumedLoc(Loc);
3266	if (PLoc.isValid())
3267	return EmitAnnotationString(Str: PLoc.getFilename());
3268	return EmitAnnotationString(Str: SM.getBufferName(Loc));
3269	}
3270
3271	llvm::Constant *CodeGenModule::EmitAnnotationLineNo(SourceLocation L) {
3272	SourceManager &SM = getContext().getSourceManager();
3273	PresumedLoc PLoc = SM.getPresumedLoc(Loc: L);
3274	unsigned LineNo = PLoc.isValid() ? PLoc.getLine() :
3275	SM.getExpansionLineNumber(Loc: L);
3276	return llvm::ConstantInt::get(Ty: Int32Ty, V: LineNo);
3277	}
3278
3279	llvm::Constant *CodeGenModule::EmitAnnotationArgs(const AnnotateAttr *Attr) {
3280	ArrayRef<Expr *> Exprs = {Attr->args_begin(), Attr->args_size()};
3281	if (Exprs.empty())
3282	return llvm::ConstantPointerNull::get(T: ConstGlobalsPtrTy);
3283
3284	llvm::FoldingSetNodeID ID;
3285	for (Expr *E : Exprs) {
3286	ID.Add(cast<clang::ConstantExpr>(E)->getAPValueResult());
3287	}
3288	llvm::Constant *&Lookup = AnnotationArgs[ID.ComputeHash()];
3289	if (Lookup)
3290	return Lookup;
3291
3292	llvm::SmallVector<llvm::Constant *, 4> LLVMArgs;
3293	LLVMArgs.reserve(N: Exprs.size());
3294	ConstantEmitter ConstEmiter(*this);
3295	llvm::transform(Range&: Exprs, d_first: std::back_inserter(x&: LLVMArgs), F: [&](const Expr *E) {
3296	const auto *CE = cast<clang::ConstantExpr>(Val: E);
3297	return ConstEmiter.emitAbstract(CE->getBeginLoc(), CE->getAPValueResult(),
3298	CE->getType());
3299	});
3300	auto *Struct = llvm::ConstantStruct::getAnon(V: LLVMArgs);
3301	auto *GV = new llvm::GlobalVariable(getModule(), Struct->getType(), true,
3302	llvm::GlobalValue::PrivateLinkage, Struct,
3303	".args");
3304	GV->setSection(AnnotationSection);
3305	GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
3306
3307	Lookup = GV;
3308	return GV;
3309	}
3310
3311	llvm::Constant *CodeGenModule::EmitAnnotateAttr(llvm::GlobalValue *GV,
3312	const AnnotateAttr *AA,
3313	SourceLocation L) {
3314	// Get the globals for file name, annotation, and the line number.
3315	llvm::Constant *AnnoGV = EmitAnnotationString(Str: AA->getAnnotation()),
3316	*UnitGV = EmitAnnotationUnit(Loc: L),
3317	*LineNoCst = EmitAnnotationLineNo(L),
3318	*Args = EmitAnnotationArgs(Attr: AA);
3319
3320	llvm::Constant *GVInGlobalsAS = GV;
3321	if (GV->getAddressSpace() !=
3322	getDataLayout().getDefaultGlobalsAddressSpace()) {
3323	GVInGlobalsAS = llvm::ConstantExpr::getAddrSpaceCast(
3324	C: GV,
3325	Ty: llvm::PointerType::get(
3326	C&: GV->getContext(), AddressSpace: getDataLayout().getDefaultGlobalsAddressSpace()));
3327	}
3328
3329	// Create the ConstantStruct for the global annotation.
3330	llvm::Constant *Fields[] = {
3331	GVInGlobalsAS, AnnoGV, UnitGV, LineNoCst, Args,
3332	};
3333	return llvm::ConstantStruct::getAnon(V: Fields);
3334	}
3335
3336	void CodeGenModule::AddGlobalAnnotations(const ValueDecl *D,
3337	llvm::GlobalValue *GV) {
3338	assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute");
3339	// Get the struct elements for these annotations.
3340	for (const auto *I : D->specific_attrs<AnnotateAttr>())
3341	Annotations.push_back(EmitAnnotateAttr(GV, I, D->getLocation()));
3342	}
3343
3344	bool CodeGenModule::isInNoSanitizeList(SanitizerMask Kind, llvm::Function *Fn,
3345	SourceLocation Loc) const {
3346	const auto &NoSanitizeL = getContext().getNoSanitizeList();
3347	// NoSanitize by function name.
3348	if (NoSanitizeL.containsFunction(Mask: Kind, FunctionName: Fn->getName()))
3349	return true;
3350	// NoSanitize by location. Check "mainfile" prefix.
3351	auto &SM = Context.getSourceManager();
3352	FileEntryRef MainFile = *SM.getFileEntryRefForID(FID: SM.getMainFileID());
3353	if (NoSanitizeL.containsMainFile(Mask: Kind, FileName: MainFile.getName()))
3354	return true;
3355
3356	// Check "src" prefix.
3357	if (Loc.isValid())
3358	return NoSanitizeL.containsLocation(Mask: Kind, Loc);
3359	// If location is unknown, this may be a compiler-generated function. Assume
3360	// it's located in the main file.
3361	return NoSanitizeL.containsFile(Mask: Kind, FileName: MainFile.getName());
3362	}
3363
3364	bool CodeGenModule::isInNoSanitizeList(SanitizerMask Kind,
3365	llvm::GlobalVariable *GV,
3366	SourceLocation Loc, QualType Ty,
3367	StringRef Category) const {
3368	const auto &NoSanitizeL = getContext().getNoSanitizeList();
3369	if (NoSanitizeL.containsGlobal(Mask: Kind, GlobalName: GV->getName(), Category))
3370	return true;
3371	auto &SM = Context.getSourceManager();
3372	if (NoSanitizeL.containsMainFile(
3373	Mask: Kind, FileName: SM.getFileEntryRefForID(FID: SM.getMainFileID())->getName(),
3374	Category))
3375	return true;
3376	if (NoSanitizeL.containsLocation(Mask: Kind, Loc, Category))
3377	return true;
3378
3379	// Check global type.
3380	if (!Ty.isNull()) {
3381	// Drill down the array types: if global variable of a fixed type is
3382	// not sanitized, we also don't instrument arrays of them.
3383	while (auto AT = dyn_cast<ArrayType>(Val: Ty.getTypePtr()))
3384	Ty = AT->getElementType();
3385	Ty = Ty.getCanonicalType().getUnqualifiedType();
3386	// Only record types (classes, structs etc.) are ignored.
3387	if (Ty->isRecordType()) {
3388	std::string TypeStr = Ty.getAsString(Policy: getContext().getPrintingPolicy());
3389	if (NoSanitizeL.containsType(Mask: Kind, MangledTypeName: TypeStr, Category))
3390	return true;
3391	}
3392	}
3393	return false;
3394	}
3395
3396	bool CodeGenModule::imbueXRayAttrs(llvm::Function *Fn, SourceLocation Loc,
3397	StringRef Category) const {
3398	const auto &XRayFilter = getContext().getXRayFilter();
3399	using ImbueAttr = XRayFunctionFilter::ImbueAttribute;
3400	auto Attr = ImbueAttr::NONE;
3401	if (Loc.isValid())
3402	Attr = XRayFilter.shouldImbueLocation(Loc, Category);
3403	if (Attr == ImbueAttr::NONE)
3404	Attr = XRayFilter.shouldImbueFunction(FunctionName: Fn->getName());
3405	switch (Attr) {
3406	case ImbueAttr::NONE:
3407	return false;
3408	case ImbueAttr::ALWAYS:
3409	Fn->addFnAttr(Kind: "function-instrument", Val: "xray-always");
3410	break;
3411	case ImbueAttr::ALWAYS_ARG1:
3412	Fn->addFnAttr(Kind: "function-instrument", Val: "xray-always");
3413	Fn->addFnAttr(Kind: "xray-log-args", Val: "1");
3414	break;
3415	case ImbueAttr::NEVER:
3416	Fn->addFnAttr(Kind: "function-instrument", Val: "xray-never");
3417	break;
3418	}
3419	return true;
3420	}
3421
3422	ProfileList::ExclusionType
3423	CodeGenModule::isFunctionBlockedByProfileList(llvm::Function *Fn,
3424	SourceLocation Loc) const {
3425	const auto &ProfileList = getContext().getProfileList();
3426	// If the profile list is empty, then instrument everything.
3427	if (ProfileList.isEmpty())
3428	return ProfileList::Allow;
3429	CodeGenOptions::ProfileInstrKind Kind = getCodeGenOpts().getProfileInstr();
3430	// First, check the function name.
3431	if (auto V = ProfileList.isFunctionExcluded(FunctionName: Fn->getName(), Kind))
3432	return *V;
3433	// Next, check the source location.
3434	if (Loc.isValid())
3435	if (auto V = ProfileList.isLocationExcluded(Loc, Kind))
3436	return *V;
3437	// If location is unknown, this may be a compiler-generated function. Assume
3438	// it's located in the main file.
3439	auto &SM = Context.getSourceManager();
3440	if (auto MainFile = SM.getFileEntryRefForID(FID: SM.getMainFileID()))
3441	if (auto V = ProfileList.isFileExcluded(FileName: MainFile->getName(), Kind))
3442	return *V;
3443	return ProfileList.getDefault(Kind);
3444	}
3445
3446	ProfileList::ExclusionType
3447	CodeGenModule::isFunctionBlockedFromProfileInstr(llvm::Function *Fn,
3448	SourceLocation Loc) const {
3449	auto V = isFunctionBlockedByProfileList(Fn, Loc);
3450	if (V != ProfileList::Allow)
3451	return V;
3452
3453	auto NumGroups = getCodeGenOpts().ProfileTotalFunctionGroups;
3454	if (NumGroups > 1) {
3455	auto Group = llvm::crc32(Data: arrayRefFromStringRef(Input: Fn->getName())) % NumGroups;
3456	if (Group != getCodeGenOpts().ProfileSelectedFunctionGroup)
3457	return ProfileList::Skip;
3458	}
3459	return ProfileList::Allow;
3460	}
3461
3462	bool CodeGenModule::MustBeEmitted(const ValueDecl *Global) {
3463	// Never defer when EmitAllDecls is specified.
3464	if (LangOpts.EmitAllDecls)
3465	return true;
3466
3467	const auto *VD = dyn_cast<VarDecl>(Val: Global);
3468	if (VD &&
3469	((CodeGenOpts.KeepPersistentStorageVariables &&
3470	(VD->getStorageDuration() == SD_Static ||
3471	VD->getStorageDuration() == SD_Thread)) ||
3472	(CodeGenOpts.KeepStaticConsts && VD->getStorageDuration() == SD_Static &&
3473	VD->getType().isConstQualified())))
3474	return true;
3475
3476	return getContext().DeclMustBeEmitted(Global);
3477	}
3478
3479	bool CodeGenModule::MayBeEmittedEagerly(const ValueDecl *Global) {
3480	// In OpenMP 5.0 variables and function may be marked as
3481	// device_type(host/nohost) and we should not emit them eagerly unless we sure
3482	// that they must be emitted on the host/device. To be sure we need to have
3483	// seen a declare target with an explicit mentioning of the function, we know
3484	// we have if the level of the declare target attribute is -1. Note that we
3485	// check somewhere else if we should emit this at all.
3486	if (LangOpts.OpenMP >= 50 && !LangOpts.OpenMPSimd) {
3487	std::optional<OMPDeclareTargetDeclAttr *> ActiveAttr =
3488	OMPDeclareTargetDeclAttr::getActiveAttr(Global);
3489	if (!ActiveAttr || (*ActiveAttr)->getLevel() != (unsigned)-1)
3490	return false;
3491	}
3492
3493	if (const auto *FD = dyn_cast<FunctionDecl>(Val: Global)) {
3494	if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
3495	// Implicit template instantiations may change linkage if they are later
3496	// explicitly instantiated, so they should not be emitted eagerly.
3497	return false;
3498	}
3499	if (const auto *VD = dyn_cast<VarDecl>(Val: Global)) {
3500	if (Context.getInlineVariableDefinitionKind(VD) ==
3501	ASTContext::InlineVariableDefinitionKind::WeakUnknown)
3502	// A definition of an inline constexpr static data member may change
3503	// linkage later if it's redeclared outside the class.
3504	return false;
3505	if (CXX20ModuleInits && VD->getOwningModule() &&
3506	!VD->getOwningModule()->isModuleMapModule()) {
3507	// For CXX20, module-owned initializers need to be deferred, since it is
3508	// not known at this point if they will be run for the current module or
3509	// as part of the initializer for an imported one.
3510	return false;
3511	}
3512	}
3513	// If OpenMP is enabled and threadprivates must be generated like TLS, delay
3514	// codegen for global variables, because they may be marked as threadprivate.
3515	if (LangOpts.OpenMP && LangOpts.OpenMPUseTLS &&
3516	getContext().getTargetInfo().isTLSSupported() && isa<VarDecl>(Global) &&
3517	!Global->getType().isConstantStorage(getContext(), false, false) &&
3518	!OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(Global))
3519	return false;
3520
3521	return true;
3522	}
3523
3524	ConstantAddress CodeGenModule::GetAddrOfMSGuidDecl(const MSGuidDecl *GD) {
3525	StringRef Name = getMangledName(GD);
3526
3527	// The UUID descriptor should be pointer aligned.
3528	CharUnits Alignment = CharUnits::fromQuantity(Quantity: PointerAlignInBytes);
3529
3530	// Look for an existing global.
3531	if (llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name))
3532	return ConstantAddress(GV, GV->getValueType(), Alignment);
3533
3534	ConstantEmitter Emitter(*this);
3535	llvm::Constant *Init;
3536
3537	APValue &V = GD->getAsAPValue();
3538	if (!V.isAbsent()) {
3539	// If possible, emit the APValue version of the initializer. In particular,
3540	// this gets the type of the constant right.
3541	Init = Emitter.emitForInitializer(
3542	value: GD->getAsAPValue(), destAddrSpace: GD->getType().getAddressSpace(), destType: GD->getType());
3543	} else {
3544	// As a fallback, directly construct the constant.
3545	// FIXME: This may get padding wrong under esoteric struct layout rules.
3546	// MSVC appears to create a complete type 'struct __s_GUID' that it
3547	// presumably uses to represent these constants.
3548	MSGuidDecl::Parts Parts = GD->getParts();
3549	llvm::Constant *Fields[4] = {
3550	llvm::ConstantInt::get(Ty: Int32Ty, V: Parts.Part1),
3551	llvm::ConstantInt::get(Ty: Int16Ty, V: Parts.Part2),
3552	llvm::ConstantInt::get(Ty: Int16Ty, V: Parts.Part3),
3553	llvm::ConstantDataArray::getRaw(
3554	Data: StringRef(reinterpret_cast<char *>(Parts.Part4And5), 8), NumElements: 8,
3555	ElementTy: Int8Ty)};
3556	Init = llvm::ConstantStruct::getAnon(V: Fields);
3557	}
3558
3559	auto *GV = new llvm::GlobalVariable(
3560	getModule(), Init->getType(),
3561	/*isConstant=*/true, llvm::GlobalValue::LinkOnceODRLinkage, Init, Name);
3562	if (supportsCOMDAT())
3563	GV->setComdat(TheModule.getOrInsertComdat(Name: GV->getName()));
3564	setDSOLocal(GV);
3565
3566	if (!V.isAbsent()) {
3567	Emitter.finalize(global: GV);
3568	return ConstantAddress(GV, GV->getValueType(), Alignment);
3569	}
3570
3571	llvm::Type *Ty = getTypes().ConvertTypeForMem(T: GD->getType());
3572	return ConstantAddress(GV, Ty, Alignment);
3573	}
3574
3575	ConstantAddress CodeGenModule::GetAddrOfUnnamedGlobalConstantDecl(
3576	const UnnamedGlobalConstantDecl *GCD) {
3577	CharUnits Alignment = getContext().getTypeAlignInChars(GCD->getType());
3578
3579	llvm::GlobalVariable **Entry = nullptr;
3580	Entry = &UnnamedGlobalConstantDeclMap[GCD];
3581	if (*Entry)
3582	return ConstantAddress(*Entry, (*Entry)->getValueType(), Alignment);
3583
3584	ConstantEmitter Emitter(*this);
3585	llvm::Constant *Init;
3586
3587	const APValue &V = GCD->getValue();
3588
3589	assert(!V.isAbsent());
3590	Init = Emitter.emitForInitializer(value: V, destAddrSpace: GCD->getType().getAddressSpace(),
3591	destType: GCD->getType());
3592
3593	auto *GV = new llvm::GlobalVariable(getModule(), Init->getType(),
3594	/*isConstant=*/true,
3595	llvm::GlobalValue::PrivateLinkage, Init,
3596	".constant");
3597	GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
3598	GV->setAlignment(Alignment.getAsAlign());
3599
3600	Emitter.finalize(global: GV);
3601
3602	*Entry = GV;
3603	return ConstantAddress(GV, GV->getValueType(), Alignment);
3604	}
3605
3606	ConstantAddress CodeGenModule::GetAddrOfTemplateParamObject(
3607	const TemplateParamObjectDecl *TPO) {
3608	StringRef Name = getMangledName(TPO);
3609	CharUnits Alignment = getNaturalTypeAlignment(T: TPO->getType());
3610
3611	if (llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name))
3612	return ConstantAddress(GV, GV->getValueType(), Alignment);
3613
3614	ConstantEmitter Emitter(*this);
3615	llvm::Constant *Init = Emitter.emitForInitializer(
3616	value: TPO->getValue(), destAddrSpace: TPO->getType().getAddressSpace(), destType: TPO->getType());
3617
3618	if (!Init) {
3619	ErrorUnsupported(TPO, "template parameter object");
3620	return ConstantAddress::invalid();
3621	}
3622
3623	llvm::GlobalValue::LinkageTypes Linkage =
3624	isExternallyVisible(TPO->getLinkageAndVisibility().getLinkage())
3625	? llvm::GlobalValue::LinkOnceODRLinkage
3626	: llvm::GlobalValue::InternalLinkage;
3627	auto *GV = new llvm::GlobalVariable(getModule(), Init->getType(),
3628	/*isConstant=*/true, Linkage, Init, Name);
3629	setGVProperties(GV, TPO);
3630	if (supportsCOMDAT())
3631	GV->setComdat(TheModule.getOrInsertComdat(Name: GV->getName()));
3632	Emitter.finalize(global: GV);
3633
3634	return ConstantAddress(GV, GV->getValueType(), Alignment);
3635	}
3636
3637	ConstantAddress CodeGenModule::GetWeakRefReference(const ValueDecl *VD) {
3638	const AliasAttr *AA = VD->getAttr<AliasAttr>();
3639	assert(AA && "No alias?");
3640
3641	CharUnits Alignment = getContext().getDeclAlign(VD);
3642	llvm::Type *DeclTy = getTypes().ConvertTypeForMem(T: VD->getType());
3643
3644	// See if there is already something with the target's name in the module.
3645	llvm::GlobalValue *Entry = GetGlobalValue(Name: AA->getAliasee());
3646	if (Entry)
3647	return ConstantAddress(Entry, DeclTy, Alignment);
3648
3649	llvm::Constant *Aliasee;
3650	if (isa<llvm::FunctionType>(Val: DeclTy))
3651	Aliasee = GetOrCreateLLVMFunction(MangledName: AA->getAliasee(), Ty: DeclTy,
3652	D: GlobalDecl(cast<FunctionDecl>(Val: VD)),
3653	/*ForVTable=*/false);
3654	else
3655	Aliasee = GetOrCreateLLVMGlobal(MangledName: AA->getAliasee(), Ty: DeclTy, AddrSpace: LangAS::Default,
3656	D: nullptr);
3657
3658	auto *F = cast<llvm::GlobalValue>(Val: Aliasee);
3659	F->setLinkage(llvm::Function::ExternalWeakLinkage);
3660	WeakRefReferences.insert(Ptr: F);
3661
3662	return ConstantAddress(Aliasee, DeclTy, Alignment);
3663	}
3664
3665	template <typename AttrT> static bool hasImplicitAttr(const ValueDecl *D) {
3666	if (!D)
3667	return false;
3668	if (auto *A = D->getAttr<AttrT>())
3669	return A->isImplicit();
3670	return D->isImplicit();
3671	}
3672
3673	void CodeGenModule::EmitGlobal(GlobalDecl GD) {
3674	const auto *Global = cast<ValueDecl>(Val: GD.getDecl());
3675
3676	// Weak references don't produce any output by themselves.
3677	if (Global->hasAttr<WeakRefAttr>())
3678	return;
3679
3680	// If this is an alias definition (which otherwise looks like a declaration)
3681	// emit it now.
3682	if (Global->hasAttr<AliasAttr>())
3683	return EmitAliasDefinition(GD);
3684
3685	// IFunc like an alias whose value is resolved at runtime by calling resolver.
3686	if (Global->hasAttr<IFuncAttr>())
3687	return emitIFuncDefinition(GD);
3688
3689	// If this is a cpu_dispatch multiversion function, emit the resolver.
3690	if (Global->hasAttr<CPUDispatchAttr>())
3691	return emitCPUDispatchDefinition(GD);
3692
3693	// If this is CUDA, be selective about which declarations we emit.
3694	// Non-constexpr non-lambda implicit host device functions are not emitted
3695	// unless they are used on device side.
3696	if (LangOpts.CUDA) {
3697	if (LangOpts.CUDAIsDevice) {
3698	const auto *FD = dyn_cast<FunctionDecl>(Val: Global);
3699	if ((!Global->hasAttr<CUDADeviceAttr>() ||
3700	(LangOpts.OffloadImplicitHostDeviceTemplates && FD &&
3701	hasImplicitAttr<CUDAHostAttr>(FD) &&
3702	hasImplicitAttr<CUDADeviceAttr>(FD) && !FD->isConstexpr() &&
3703	!isLambdaCallOperator(FD) &&
3704	!getContext().CUDAImplicitHostDeviceFunUsedByDevice.count(FD))) &&
3705	!Global->hasAttr<CUDAGlobalAttr>() &&
3706	!Global->hasAttr<CUDAConstantAttr>() &&
3707	!Global->hasAttr<CUDASharedAttr>() &&
3708	!Global->getType()->isCUDADeviceBuiltinSurfaceType() &&
3709	!Global->getType()->isCUDADeviceBuiltinTextureType() &&
3710	!(LangOpts.HIPStdPar && isa<FunctionDecl>(Global) &&
3711	!Global->hasAttr<CUDAHostAttr>()))
3712	return;
3713	} else {
3714	// We need to emit host-side 'shadows' for all global
3715	// device-side variables because the CUDA runtime needs their
3716	// size and host-side address in order to provide access to
3717	// their device-side incarnations.
3718
3719	// So device-only functions are the only things we skip.
3720	if (isa<FunctionDecl>(Global) && !Global->hasAttr<CUDAHostAttr>() &&
3721	Global->hasAttr<CUDADeviceAttr>())
3722	return;
3723
3724	assert((isa<FunctionDecl>(Global) || isa<VarDecl>(Global)) &&
3725	"Expected Variable or Function");
3726	}
3727	}
3728
3729	if (LangOpts.OpenMP) {
3730	// If this is OpenMP, check if it is legal to emit this global normally.
3731	if (OpenMPRuntime && OpenMPRuntime->emitTargetGlobal(GD))
3732	return;
3733	if (auto *DRD = dyn_cast<OMPDeclareReductionDecl>(Val: Global)) {
3734	if (MustBeEmitted(Global))
3735	EmitOMPDeclareReduction(D: DRD);
3736	return;
3737	}
3738	if (auto *DMD = dyn_cast<OMPDeclareMapperDecl>(Val: Global)) {
3739	if (MustBeEmitted(Global))
3740	EmitOMPDeclareMapper(D: DMD);
3741	return;
3742	}
3743	}
3744
3745	// Ignore declarations, they will be emitted on their first use.
3746	if (const auto *FD = dyn_cast<FunctionDecl>(Val: Global)) {
3747	// Update deferred annotations with the latest declaration if the function
3748	// function was already used or defined.
3749	if (FD->hasAttr<AnnotateAttr>()) {
3750	StringRef MangledName = getMangledName(GD);
3751	if (GetGlobalValue(Name: MangledName))
3752	DeferredAnnotations[MangledName] = FD;
3753	}
3754
3755	// Forward declarations are emitted lazily on first use.
3756	if (!FD->doesThisDeclarationHaveABody()) {
3757	if (!FD->doesDeclarationForceExternallyVisibleDefinition())
3758	return;
3759
3760	StringRef MangledName = getMangledName(GD);
3761
3762	// Compute the function info and LLVM type.
3763	const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
3764	llvm::Type *Ty = getTypes().GetFunctionType(Info: FI);
3765
3766	GetOrCreateLLVMFunction(MangledName, Ty, D: GD, /*ForVTable=*/false,
3767	/*DontDefer=*/false);
3768	return;
3769	}
3770	} else {
3771	const auto *VD = cast<VarDecl>(Val: Global);
3772	assert(VD->isFileVarDecl() && "Cannot emit local var decl as global.");
3773	if (VD->isThisDeclarationADefinition() != VarDecl::Definition &&
3774	!Context.isMSStaticDataMemberInlineDefinition(VD)) {
3775	if (LangOpts.OpenMP) {
3776	// Emit declaration of the must-be-emitted declare target variable.
3777	if (std::optional<OMPDeclareTargetDeclAttr::MapTypeTy> Res =
3778	OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(VD)) {
3779
3780	// If this variable has external storage and doesn't require special
3781	// link handling we defer to its canonical definition.
3782	if (VD->hasExternalStorage() &&
3783	Res != OMPDeclareTargetDeclAttr::MT_Link)
3784	return;
3785
3786	bool UnifiedMemoryEnabled =
3787	getOpenMPRuntime().hasRequiresUnifiedSharedMemory();
3788	if ((*Res == OMPDeclareTargetDeclAttr::MT_To ||
3789	*Res == OMPDeclareTargetDeclAttr::MT_Enter) &&
3790	!UnifiedMemoryEnabled) {
3791	(void)GetAddrOfGlobalVar(D: VD);
3792	} else {
3793	assert(((*Res == OMPDeclareTargetDeclAttr::MT_Link) ||
3794	((*Res == OMPDeclareTargetDeclAttr::MT_To ||
3795	*Res == OMPDeclareTargetDeclAttr::MT_Enter) &&
3796	UnifiedMemoryEnabled)) &&
3797	"Link clause or to clause with unified memory expected.");
3798	(void)getOpenMPRuntime().getAddrOfDeclareTargetVar(VD);
3799	}
3800
3801	return;
3802	}
3803	}
3804	// If this declaration may have caused an inline variable definition to
3805	// change linkage, make sure that it's emitted.
3806	if (Context.getInlineVariableDefinitionKind(VD) ==
3807	ASTContext::InlineVariableDefinitionKind::Strong)
3808	GetAddrOfGlobalVar(D: VD);
3809	return;
3810	}
3811	}
3812
3813	// Defer code generation to first use when possible, e.g. if this is an inline
3814	// function. If the global must always be emitted, do it eagerly if possible
3815	// to benefit from cache locality.
3816	if (MustBeEmitted(Global) && MayBeEmittedEagerly(Global)) {
3817	// Emit the definition if it can't be deferred.
3818	EmitGlobalDefinition(D: GD);
3819	addEmittedDeferredDecl(GD);
3820	return;
3821	}
3822
3823	// If we're deferring emission of a C++ variable with an
3824	// initializer, remember the order in which it appeared in the file.
3825	if (getLangOpts().CPlusPlus && isa<VarDecl>(Val: Global) &&
3826	cast<VarDecl>(Val: Global)->hasInit()) {
3827	DelayedCXXInitPosition[Global] = CXXGlobalInits.size();
3828	CXXGlobalInits.push_back(x: nullptr);
3829	}
3830
3831	StringRef MangledName = getMangledName(GD);
3832	if (GetGlobalValue(Name: MangledName) != nullptr) {
3833	// The value has already been used and should therefore be emitted.
3834	addDeferredDeclToEmit(GD);
3835	} else if (MustBeEmitted(Global)) {
3836	// The value must be emitted, but cannot be emitted eagerly.
3837	assert(!MayBeEmittedEagerly(Global));
3838	addDeferredDeclToEmit(GD);
3839	} else {
3840	// Otherwise, remember that we saw a deferred decl with this name. The
3841	// first use of the mangled name will cause it to move into
3842	// DeferredDeclsToEmit.
3843	DeferredDecls[MangledName] = GD;
3844	}
3845	}
3846
3847	// Check if T is a class type with a destructor that's not dllimport.
3848	static bool HasNonDllImportDtor(QualType T) {
3849	if (const auto *RT = T->getBaseElementTypeUnsafe()->getAs<RecordType>())
3850	if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Val: RT->getDecl()))
3851	if (RD->getDestructor() && !RD->getDestructor()->hasAttr<DLLImportAttr>())
3852	return true;
3853
3854	return false;
3855	}
3856
3857	namespace {
3858	struct FunctionIsDirectlyRecursive
3859	: public ConstStmtVisitor<FunctionIsDirectlyRecursive, bool> {
3860	const StringRef Name;
3861	const Builtin::Context &BI;
3862	FunctionIsDirectlyRecursive(StringRef N, const Builtin::Context &C)
3863	: Name(N), BI(C) {}
3864
3865	bool VisitCallExpr(const CallExpr *E) {
3866	const FunctionDecl *FD = E->getDirectCallee();
3867	if (!FD)
3868	return false;
3869	AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
3870	if (Attr && Name == Attr->getLabel())
3871	return true;
3872	unsigned BuiltinID = FD->getBuiltinID();
3873	if (!BuiltinID || !BI.isLibFunction(ID: BuiltinID))
3874	return false;
3875	StringRef BuiltinName = BI.getName(ID: BuiltinID);
3876	if (BuiltinName.starts_with(Prefix: "__builtin_") &&
3877	Name == BuiltinName.slice(Start: strlen(s: "__builtin_"), End: StringRef::npos)) {
3878	return true;
3879	}
3880	return false;
3881	}
3882
3883	bool VisitStmt(const Stmt *S) {
3884	for (const Stmt *Child : S->children())
3885	if (Child && this->Visit(Child))
3886	return true;
3887	return false;
3888	}
3889	};
3890
3891	// Make sure we're not referencing non-imported vars or functions.
3892	struct DLLImportFunctionVisitor
3893	: public RecursiveASTVisitor<DLLImportFunctionVisitor> {
3894	bool SafeToInline = true;
3895
3896	bool shouldVisitImplicitCode() const { return true; }
3897
3898	bool VisitVarDecl(VarDecl *VD) {
3899	if (VD->getTLSKind()) {
3900	// A thread-local variable cannot be imported.
3901	SafeToInline = false;
3902	return SafeToInline;
3903	}
3904
3905	// A variable definition might imply a destructor call.
3906	if (VD->isThisDeclarationADefinition())
3907	SafeToInline = !HasNonDllImportDtor(VD->getType());
3908
3909	return SafeToInline;
3910	}
3911
3912	bool VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) {
3913	if (const auto *D = E->getTemporary()->getDestructor())
3914	SafeToInline = D->hasAttr<DLLImportAttr>();
3915	return SafeToInline;
3916	}
3917
3918	bool VisitDeclRefExpr(DeclRefExpr *E) {
3919	ValueDecl *VD = E->getDecl();
3920	if (isa<FunctionDecl>(VD))
3921	SafeToInline = VD->hasAttr<DLLImportAttr>();
3922	else if (VarDecl *V = dyn_cast<VarDecl>(VD))
3923	SafeToInline = !V->hasGlobalStorage() || V->hasAttr<DLLImportAttr>();
3924	return SafeToInline;
3925	}
3926
3927	bool VisitCXXConstructExpr(CXXConstructExpr *E) {
3928	SafeToInline = E->getConstructor()->hasAttr<DLLImportAttr>();
3929	return SafeToInline;
3930	}
3931
3932	bool VisitCXXMemberCallExpr(CXXMemberCallExpr *E) {
3933	CXXMethodDecl *M = E->getMethodDecl();
3934	if (!M) {
3935	// Call through a pointer to member function. This is safe to inline.
3936	SafeToInline = true;
3937	} else {
3938	SafeToInline = M->hasAttr<DLLImportAttr>();
3939	}
3940	return SafeToInline;
3941	}
3942
3943	bool VisitCXXDeleteExpr(CXXDeleteExpr *E) {
3944	SafeToInline = E->getOperatorDelete()->hasAttr<DLLImportAttr>();
3945	return SafeToInline;
3946	}
3947
3948	bool VisitCXXNewExpr(CXXNewExpr *E) {
3949	SafeToInline = E->getOperatorNew()->hasAttr<DLLImportAttr>();
3950	return SafeToInline;
3951	}
3952	};
3953	}
3954
3955	// isTriviallyRecursive - Check if this function calls another
3956	// decl that, because of the asm attribute or the other decl being a builtin,
3957	// ends up pointing to itself.
3958	bool
3959	CodeGenModule::isTriviallyRecursive(const FunctionDecl *FD) {
3960	StringRef Name;
3961	if (getCXXABI().getMangleContext().shouldMangleDeclName(FD)) {
3962	// asm labels are a special kind of mangling we have to support.
3963	AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
3964	if (!Attr)
3965	return false;
3966	Name = Attr->getLabel();
3967	} else {
3968	Name = FD->getName();
3969	}
3970
3971	FunctionIsDirectlyRecursive Walker(Name, Context.BuiltinInfo);
3972	const Stmt *Body = FD->getBody();
3973	return Body ? Walker.Visit(Body) : false;
3974	}
3975
3976	bool CodeGenModule::shouldEmitFunction(GlobalDecl GD) {
3977	if (getFunctionLinkage(GD) != llvm::Function::AvailableExternallyLinkage)
3978	return true;
3979
3980	const auto *F = cast<FunctionDecl>(Val: GD.getDecl());
3981	if (CodeGenOpts.OptimizationLevel == 0 && !F->hasAttr<AlwaysInlineAttr>())
3982	return false;
3983
3984	// We don't import function bodies from other named module units since that
3985	// behavior may break ABI compatibility of the current unit.
3986	if (const Module *M = F->getOwningModule();
3987	M && M->getTopLevelModule()->isNamedModule() &&
3988	getContext().getCurrentNamedModule() != M->getTopLevelModule() &&
3989	!F->hasAttr<AlwaysInlineAttr>())
3990	return false;
3991
3992	if (F->hasAttr<NoInlineAttr>())
3993	return false;
3994
3995	if (F->hasAttr<DLLImportAttr>() && !F->hasAttr<AlwaysInlineAttr>()) {
3996	// Check whether it would be safe to inline this dllimport function.
3997	DLLImportFunctionVisitor Visitor;
3998	Visitor.TraverseFunctionDecl(const_cast<FunctionDecl*>(F));
3999	if (!Visitor.SafeToInline)
4000	return false;
4001
4002	if (const CXXDestructorDecl *Dtor = dyn_cast<CXXDestructorDecl>(Val: F)) {
4003	// Implicit destructor invocations aren't captured in the AST, so the
4004	// check above can't see them. Check for them manually here.
4005	for (const Decl *Member : Dtor->getParent()->decls())
4006	if (isa<FieldDecl>(Member))
4007	if (HasNonDllImportDtor(cast<FieldDecl>(Member)->getType()))
4008	return false;
4009	for (const CXXBaseSpecifier &B : Dtor->getParent()->bases())
4010	if (HasNonDllImportDtor(B.getType()))
4011	return false;
4012	}
4013	}
4014
4015	// Inline builtins declaration must be emitted. They often are fortified
4016	// functions.
4017	if (F->isInlineBuiltinDeclaration())
4018	return true;
4019
4020	// PR9614. Avoid cases where the source code is lying to us. An available
4021	// externally function should have an equivalent function somewhere else,
4022	// but a function that calls itself through asm label/`__builtin_` trickery is
4023	// clearly not equivalent to the real implementation.
4024	// This happens in glibc's btowc and in some configure checks.
4025	return !isTriviallyRecursive(FD: F);
4026	}
4027
4028	bool CodeGenModule::shouldOpportunisticallyEmitVTables() {
4029	return CodeGenOpts.OptimizationLevel > 0;
4030	}
4031
4032	void CodeGenModule::EmitMultiVersionFunctionDefinition(GlobalDecl GD,
4033	llvm::GlobalValue *GV) {
4034	const auto *FD = cast<FunctionDecl>(Val: GD.getDecl());
4035
4036	if (FD->isCPUSpecificMultiVersion()) {
4037	auto *Spec = FD->getAttr<CPUSpecificAttr>();
4038	for (unsigned I = 0; I < Spec->cpus_size(); ++I)
4039	EmitGlobalFunctionDefinition(GD: GD.getWithMultiVersionIndex(Index: I), GV: nullptr);
4040	} else if (FD->isTargetClonesMultiVersion()) {
4041	auto *Clone = FD->getAttr<TargetClonesAttr>();
4042	for (unsigned I = 0; I < Clone->featuresStrs_size(); ++I)
4043	if (Clone->isFirstOfVersion(I))
4044	EmitGlobalFunctionDefinition(GD: GD.getWithMultiVersionIndex(Index: I), GV: nullptr);
4045	// Ensure that the resolver function is also emitted.
4046	GetOrCreateMultiVersionResolver(GD);
4047	} else if (FD->hasAttr<TargetVersionAttr>()) {
4048	GetOrCreateMultiVersionResolver(GD);
4049	} else
4050	EmitGlobalFunctionDefinition(GD, GV);
4051	}
4052
4053	void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD, llvm::GlobalValue *GV) {
4054	const auto *D = cast<ValueDecl>(Val: GD.getDecl());
4055
4056	PrettyStackTraceDecl CrashInfo(const_cast<ValueDecl *>(D), D->getLocation(),
4057	Context.getSourceManager(),
4058	"Generating code for declaration");
4059
4060	if (const auto *FD = dyn_cast<FunctionDecl>(Val: D)) {
4061	// At -O0, don't generate IR for functions with available_externally
4062	// linkage.
4063	if (!shouldEmitFunction(GD))
4064	return;
4065
4066	llvm::TimeTraceScope TimeScope("CodeGen Function", [&]() {
4067	std::string Name;
4068	llvm::raw_string_ostream OS(Name);
4069	FD->getNameForDiagnostic(OS, Policy: getContext().getPrintingPolicy(),
4070	/*Qualified=*/true);
4071	return Name;
4072	});
4073
4074	if (const auto *Method = dyn_cast<CXXMethodDecl>(Val: D)) {
4075	// Make sure to emit the definition(s) before we emit the thunks.
4076	// This is necessary for the generation of certain thunks.
4077	if (isa<CXXConstructorDecl>(Val: Method) || isa<CXXDestructorDecl>(Val: Method))
4078	ABI->emitCXXStructor(GD);
4079	else if (FD->isMultiVersion())
4080	EmitMultiVersionFunctionDefinition(GD, GV);
4081	else
4082	EmitGlobalFunctionDefinition(GD, GV);
4083
4084	if (Method->isVirtual())
4085	getVTables().EmitThunks(GD);
4086
4087	return;
4088	}
4089
4090	if (FD->isMultiVersion())
4091	return EmitMultiVersionFunctionDefinition(GD, GV);
4092	return EmitGlobalFunctionDefinition(GD, GV);
4093	}
4094
4095	if (const auto *VD = dyn_cast<VarDecl>(Val: D))
4096	return EmitGlobalVarDefinition(D: VD, IsTentative: !VD->hasDefinition());
4097
4098	llvm_unreachable("Invalid argument to EmitGlobalDefinition()");
4099	}
4100
4101	static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old,
4102	llvm::Function *NewFn);
4103
4104	static unsigned
4105	TargetMVPriority(const TargetInfo &TI,
4106	const CodeGenFunction::MultiVersionResolverOption &RO) {
4107	unsigned Priority = 0;
4108	unsigned NumFeatures = 0;
4109	for (StringRef Feat : RO.Conditions.Features) {
4110	Priority = std::max(a: Priority, b: TI.multiVersionSortPriority(Name: Feat));
4111	NumFeatures++;
4112	}
4113
4114	if (!RO.Conditions.Architecture.empty())
4115	Priority = std::max(
4116	a: Priority, b: TI.multiVersionSortPriority(Name: RO.Conditions.Architecture));
4117
4118	Priority += TI.multiVersionFeatureCost() * NumFeatures;
4119
4120	return Priority;
4121	}
4122
4123	// Multiversion functions should be at most 'WeakODRLinkage' so that a different
4124	// TU can forward declare the function without causing problems. Particularly
4125	// in the cases of CPUDispatch, this causes issues. This also makes sure we
4126	// work with internal linkage functions, so that the same function name can be
4127	// used with internal linkage in multiple TUs.
4128	llvm::GlobalValue::LinkageTypes getMultiversionLinkage(CodeGenModule &CGM,
4129	GlobalDecl GD) {
4130	const FunctionDecl *FD = cast<FunctionDecl>(Val: GD.getDecl());
4131	if (FD->getFormalLinkage() == Linkage::Internal)
4132	return llvm::GlobalValue::InternalLinkage;
4133	return llvm::GlobalValue::WeakODRLinkage;
4134	}
4135
4136	void CodeGenModule::emitMultiVersionFunctions() {
4137	std::vector<GlobalDecl> MVFuncsToEmit;
4138	MultiVersionFuncs.swap(x&: MVFuncsToEmit);
4139	for (GlobalDecl GD : MVFuncsToEmit) {
4140	const auto *FD = cast<FunctionDecl>(Val: GD.getDecl());
4141	assert(FD && "Expected a FunctionDecl");
4142
4143	SmallVector<CodeGenFunction::MultiVersionResolverOption, 10> Options;
4144	if (FD->isTargetMultiVersion()) {
4145	getContext().forEachMultiversionedFunctionVersion(
4146	FD, Pred: [this, &GD, &Options](const FunctionDecl *CurFD) {
4147	GlobalDecl CurGD{
4148	(CurFD->isDefined() ? CurFD->getDefinition() : CurFD)};
4149	StringRef MangledName = getMangledName(GD: CurGD);
4150	llvm::Constant *Func = GetGlobalValue(Name: MangledName);
4151	if (!Func) {
4152	if (CurFD->isDefined()) {
4153	EmitGlobalFunctionDefinition(GD: CurGD, GV: nullptr);
4154	Func = GetGlobalValue(Name: MangledName);
4155	} else {
4156	const CGFunctionInfo &FI =
4157	getTypes().arrangeGlobalDeclaration(GD);
4158	llvm::FunctionType *Ty = getTypes().GetFunctionType(Info: FI);
4159	Func = GetAddrOfFunction(GD: CurGD, Ty, /*ForVTable=*/false,
4160	/*DontDefer=*/false, IsForDefinition: ForDefinition);
4161	}
4162	assert(Func && "This should have just been created");
4163	}
4164	if (CurFD->getMultiVersionKind() == MultiVersionKind::Target) {
4165	const auto *TA = CurFD->getAttr<TargetAttr>();
4166	llvm::SmallVector<StringRef, 8> Feats;
4167	TA->getAddedFeatures(Feats);
4168	Options.emplace_back(cast<llvm::Function>(Val: Func),
4169	TA->getArchitecture(), Feats);
4170	} else {
4171	const auto *TVA = CurFD->getAttr<TargetVersionAttr>();
4172	llvm::SmallVector<StringRef, 8> Feats;
4173	TVA->getFeatures(Feats);
4174	Options.emplace_back(Args: cast<llvm::Function>(Val: Func),
4175	/*Architecture*/ Args: "", Args&: Feats);
4176	}
4177	});
4178	} else if (FD->isTargetClonesMultiVersion()) {
4179	const auto *TC = FD->getAttr<TargetClonesAttr>();
4180	for (unsigned VersionIndex = 0; VersionIndex < TC->featuresStrs_size();
4181	++VersionIndex) {
4182	if (!TC->isFirstOfVersion(VersionIndex))
4183	continue;
4184	GlobalDecl CurGD{(FD->isDefined() ? FD->getDefinition() : FD),
4185	VersionIndex};
4186	StringRef Version = TC->getFeatureStr(VersionIndex);
4187	StringRef MangledName = getMangledName(GD: CurGD);
4188	llvm::Constant *Func = GetGlobalValue(Name: MangledName);
4189	if (!Func) {
4190	if (FD->isDefined()) {
4191	EmitGlobalFunctionDefinition(GD: CurGD, GV: nullptr);
4192	Func = GetGlobalValue(Name: MangledName);
4193	} else {
4194	const CGFunctionInfo &FI =
4195	getTypes().arrangeGlobalDeclaration(GD: CurGD);
4196	llvm::FunctionType *Ty = getTypes().GetFunctionType(Info: FI);
4197	Func = GetAddrOfFunction(GD: CurGD, Ty, /*ForVTable=*/false,
4198	/*DontDefer=*/false, IsForDefinition: ForDefinition);
4199	}
4200	assert(Func && "This should have just been created");
4201	}
4202
4203	StringRef Architecture;
4204	llvm::SmallVector<StringRef, 1> Feature;
4205
4206	if (getTarget().getTriple().isAArch64()) {
4207	if (Version != "default") {
4208	llvm::SmallVector<StringRef, 8> VerFeats;
4209	Version.split(A&: VerFeats, Separator: "+");
4210	for (auto &CurFeat : VerFeats)
4211	Feature.push_back(Elt: CurFeat.trim());
4212	}
4213	} else {
4214	if (Version.starts_with(Prefix: "arch="))
4215	Architecture = Version.drop_front(N: sizeof("arch=") - 1);
4216	else if (Version != "default")
4217	Feature.push_back(Elt: Version);
4218	}
4219
4220	Options.emplace_back(Args: cast<llvm::Function>(Val: Func), Args&: Architecture, Args&: Feature);
4221	}
4222	} else {
4223	assert(0 && "Expected a target or target_clones multiversion function");
4224	continue;
4225	}
4226
4227	llvm::Constant *ResolverConstant = GetOrCreateMultiVersionResolver(GD);
4228	if (auto *IFunc = dyn_cast<llvm::GlobalIFunc>(Val: ResolverConstant)) {
4229	ResolverConstant = IFunc->getResolver();
4230	if (FD->isTargetClonesMultiVersion() ||
4231	FD->isTargetVersionMultiVersion()) {
4232	const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
4233	llvm::FunctionType *DeclTy = getTypes().GetFunctionType(Info: FI);
4234	std::string MangledName = getMangledNameImpl(
4235	*this, GD, FD, /*OmitMultiVersionMangling=*/true);
4236	// In prior versions of Clang, the mangling for ifuncs incorrectly
4237	// included an .ifunc suffix. This alias is generated for backward
4238	// compatibility. It is deprecated, and may be removed in the future.
4239	auto *Alias = llvm::GlobalAlias::create(
4240	Ty: DeclTy, AddressSpace: 0, Linkage: getMultiversionLinkage(CGM&: *this, GD),
4241	Name: MangledName + ".ifunc", Aliasee: IFunc, Parent: &getModule());
4242	SetCommonAttributes(GD: FD, GV: Alias);
4243	}
4244	}
4245	llvm::Function *ResolverFunc = cast<llvm::Function>(Val: ResolverConstant);
4246
4247	ResolverFunc->setLinkage(getMultiversionLinkage(CGM&: *this, GD));
4248
4249	if (!ResolverFunc->hasLocalLinkage() && supportsCOMDAT())
4250	ResolverFunc->setComdat(
4251	getModule().getOrInsertComdat(Name: ResolverFunc->getName()));
4252
4253	const TargetInfo &TI = getTarget();
4254	llvm::stable_sort(
4255	Range&: Options, C: [&TI](const CodeGenFunction::MultiVersionResolverOption &LHS,
4256	const CodeGenFunction::MultiVersionResolverOption &RHS) {
4257	return TargetMVPriority(TI, RO: LHS) > TargetMVPriority(TI, RO: RHS);
4258	});
4259	CodeGenFunction CGF(*this);
4260	CGF.EmitMultiVersionResolver(Resolver: ResolverFunc, Options);
4261	}
4262
4263	// Ensure that any additions to the deferred decls list caused by emitting a
4264	// variant are emitted. This can happen when the variant itself is inline and
4265	// calls a function without linkage.
4266	if (!MVFuncsToEmit.empty())
4267	EmitDeferred();
4268
4269	// Ensure that any additions to the multiversion funcs list from either the
4270	// deferred decls or the multiversion functions themselves are emitted.
4271	if (!MultiVersionFuncs.empty())
4272	emitMultiVersionFunctions();
4273	}
4274
4275	void CodeGenModule::emitCPUDispatchDefinition(GlobalDecl GD) {
4276	const auto *FD = cast<FunctionDecl>(Val: GD.getDecl());
4277	assert(FD && "Not a FunctionDecl?");
4278	assert(FD->isCPUDispatchMultiVersion() && "Not a multiversion function?");
4279	const auto *DD = FD->getAttr<CPUDispatchAttr>();
4280	assert(DD && "Not a cpu_dispatch Function?");
4281
4282	const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
4283	llvm::FunctionType *DeclTy = getTypes().GetFunctionType(Info: FI);
4284
4285	StringRef ResolverName = getMangledName(GD);
4286	UpdateMultiVersionNames(GD, FD, CurName&: ResolverName);
4287
4288	llvm::Type *ResolverType;
4289	GlobalDecl ResolverGD;
4290	if (getTarget().supportsIFunc()) {
4291	ResolverType = llvm::FunctionType::get(
4292	llvm::PointerType::get(DeclTy,
4293	getTypes().getTargetAddressSpace(T: FD->getType())),
4294	false);
4295	}
4296	else {
4297	ResolverType = DeclTy;
4298	ResolverGD = GD;
4299	}
4300
4301	auto *ResolverFunc = cast<llvm::Function>(Val: GetOrCreateLLVMFunction(
4302	MangledName: ResolverName, Ty: ResolverType, D: ResolverGD, /*ForVTable=*/false));
4303	ResolverFunc->setLinkage(getMultiversionLinkage(CGM&: *this, GD));
4304	if (supportsCOMDAT())
4305	ResolverFunc->setComdat(
4306	getModule().getOrInsertComdat(Name: ResolverFunc->getName()));
4307
4308	SmallVector<CodeGenFunction::MultiVersionResolverOption, 10> Options;
4309	const TargetInfo &Target = getTarget();
4310	unsigned Index = 0;
4311	for (const IdentifierInfo *II : DD->cpus()) {
4312	// Get the name of the target function so we can look it up/create it.
4313	std::string MangledName = getMangledNameImpl(*this, GD, FD, true) +
4314	getCPUSpecificMangling(*this, II->getName());
4315
4316	llvm::Constant *Func = GetGlobalValue(MangledName);
4317
4318	if (!Func) {
4319	GlobalDecl ExistingDecl = Manglings.lookup(MangledName);
4320	if (ExistingDecl.getDecl() &&
4321	ExistingDecl.getDecl()->getAsFunction()->isDefined()) {
4322	EmitGlobalFunctionDefinition(ExistingDecl, nullptr);
4323	Func = GetGlobalValue(MangledName);
4324	} else {
4325	if (!ExistingDecl.getDecl())
4326	ExistingDecl = GD.getWithMultiVersionIndex(Index);
4327
4328	Func = GetOrCreateLLVMFunction(
4329	MangledName, DeclTy, ExistingDecl,
4330	/*ForVTable=*/false, /*DontDefer=*/true,
4331	/*IsThunk=*/false, llvm::AttributeList(), ForDefinition);
4332	}
4333	}
4334
4335	llvm::SmallVector<StringRef, 32> Features;
4336	Target.getCPUSpecificCPUDispatchFeatures(II->getName(), Features);
4337	llvm::transform(Features, Features.begin(),
4338	[](StringRef Str) { return Str.substr(1); });
4339	llvm::erase_if(Features, [&Target](StringRef Feat) {
4340	return !Target.validateCpuSupports(Feat);
4341	});
4342	Options.emplace_back(cast<llvm::Function>(Func), StringRef{}, Features);
4343	++Index;
4344	}
4345
4346	llvm::stable_sort(
4347	Range&: Options, C: [](const CodeGenFunction::MultiVersionResolverOption &LHS,
4348	const CodeGenFunction::MultiVersionResolverOption &RHS) {
4349	return llvm::X86::getCpuSupportsMask(FeatureStrs: LHS.Conditions.Features) >
4350	llvm::X86::getCpuSupportsMask(FeatureStrs: RHS.Conditions.Features);
4351	});
4352
4353	// If the list contains multiple 'default' versions, such as when it contains
4354	// 'pentium' and 'generic', don't emit the call to the generic one (since we
4355	// always run on at least a 'pentium'). We do this by deleting the 'least
4356	// advanced' (read, lowest mangling letter).
4357	while (Options.size() > 1 &&
4358	llvm::all_of(Range: llvm::X86::getCpuSupportsMask(
4359	FeatureStrs: (Options.end() - 2)->Conditions.Features),
4360	P: [](auto X) { return X == 0; })) {
4361	StringRef LHSName = (Options.end() - 2)->Function->getName();
4362	StringRef RHSName = (Options.end() - 1)->Function->getName();
4363	if (LHSName.compare(RHS: RHSName) < 0)
4364	Options.erase(CI: Options.end() - 2);
4365	else
4366	Options.erase(CI: Options.end() - 1);
4367	}
4368
4369	CodeGenFunction CGF(*this);
4370	CGF.EmitMultiVersionResolver(Resolver: ResolverFunc, Options);
4371
4372	if (getTarget().supportsIFunc()) {
4373	llvm::GlobalValue::LinkageTypes Linkage = getMultiversionLinkage(CGM&: *this, GD);
4374	auto *IFunc = cast<llvm::GlobalValue>(Val: GetOrCreateMultiVersionResolver(GD));
4375
4376	// Fix up function declarations that were created for cpu_specific before
4377	// cpu_dispatch was known
4378	if (!isa<llvm::GlobalIFunc>(Val: IFunc)) {
4379	assert(cast<llvm::Function>(IFunc)->isDeclaration());
4380	auto *GI = llvm::GlobalIFunc::create(Ty: DeclTy, AddressSpace: 0, Linkage, Name: "", Resolver: ResolverFunc,
4381	Parent: &getModule());
4382	GI->takeName(V: IFunc);
4383	IFunc->replaceAllUsesWith(V: GI);
4384	IFunc->eraseFromParent();
4385	IFunc = GI;
4386	}
4387
4388	std::string AliasName = getMangledNameImpl(
4389	*this, GD, FD, /*OmitMultiVersionMangling=*/true);
4390	llvm::Constant *AliasFunc = GetGlobalValue(Name: AliasName);
4391	if (!AliasFunc) {
4392	auto *GA = llvm::GlobalAlias::create(Ty: DeclTy, AddressSpace: 0, Linkage, Name: AliasName, Aliasee: IFunc,
4393	Parent: &getModule());
4394	SetCommonAttributes(GD, GV: GA);
4395	}
4396	}
4397	}
4398
4399	/// If a dispatcher for the specified mangled name is not in the module, create
4400	/// and return an llvm Function with the specified type.
4401	llvm::Constant *CodeGenModule::GetOrCreateMultiVersionResolver(GlobalDecl GD) {
4402	const auto *FD = cast<FunctionDecl>(Val: GD.getDecl());
4403	assert(FD && "Not a FunctionDecl?");
4404
4405	std::string MangledName =
4406	getMangledNameImpl(*this, GD, FD, /*OmitMultiVersionMangling=*/true);
4407
4408	// Holds the name of the resolver, in ifunc mode this is the ifunc (which has
4409	// a separate resolver).
4410	std::string ResolverName = MangledName;
4411	if (getTarget().supportsIFunc()) {
4412	switch (FD->getMultiVersionKind()) {
4413	case MultiVersionKind::None:
4414	llvm_unreachable("unexpected MultiVersionKind::None for resolver");
4415	case MultiVersionKind::Target:
4416	case MultiVersionKind::CPUSpecific:
4417	case MultiVersionKind::CPUDispatch:
4418	ResolverName += ".ifunc";
4419	break;
4420	case MultiVersionKind::TargetClones:
4421	case MultiVersionKind::TargetVersion:
4422	break;
4423	}
4424	} else if (FD->isTargetMultiVersion()) {
4425	ResolverName += ".resolver";
4426	}
4427
4428	// If the resolver has already been created, just return it.
4429	if (llvm::GlobalValue *ResolverGV = GetGlobalValue(Name: ResolverName))
4430	return ResolverGV;
4431
4432	const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
4433	llvm::FunctionType *DeclTy = getTypes().GetFunctionType(Info: FI);
4434
4435	// The resolver needs to be created. For target and target_clones, defer
4436	// creation until the end of the TU.
4437	if (FD->isTargetMultiVersion() || FD->isTargetClonesMultiVersion())
4438	MultiVersionFuncs.push_back(x: GD);
4439
4440	// For cpu_specific, don't create an ifunc yet because we don't know if the
4441	// cpu_dispatch will be emitted in this translation unit.
4442	if (getTarget().supportsIFunc() && !FD->isCPUSpecificMultiVersion()) {
4443	llvm::Type *ResolverType = llvm::FunctionType::get(
4444	llvm::PointerType::get(DeclTy,
4445	getTypes().getTargetAddressSpace(T: FD->getType())),
4446	false);
4447	llvm::Constant *Resolver = GetOrCreateLLVMFunction(
4448	MangledName: MangledName + ".resolver", Ty: ResolverType, D: GlobalDecl{},
4449	/*ForVTable=*/false);
4450	llvm::GlobalIFunc *GIF =
4451	llvm::GlobalIFunc::create(Ty: DeclTy, AddressSpace: 0, Linkage: getMultiversionLinkage(CGM&: *this, GD),
4452	Name: "", Resolver, Parent: &getModule());
4453	GIF->setName(ResolverName);
4454	SetCommonAttributes(GD: FD, GV: GIF);
4455
4456	return GIF;
4457	}
4458
4459	llvm::Constant *Resolver = GetOrCreateLLVMFunction(
4460	MangledName: ResolverName, Ty: DeclTy, D: GlobalDecl{}, /*ForVTable=*/false);
4461	assert(isa<llvm::GlobalValue>(Resolver) &&
4462	"Resolver should be created for the first time");
4463	SetCommonAttributes(GD: FD, GV: cast<llvm::GlobalValue>(Val: Resolver));
4464	return Resolver;
4465	}
4466
4467	/// GetOrCreateLLVMFunction - If the specified mangled name is not in the
4468	/// module, create and return an llvm Function with the specified type. If there
4469	/// is something in the module with the specified name, return it potentially
4470	/// bitcasted to the right type.
4471	///
4472	/// If D is non-null, it specifies a decl that correspond to this. This is used
4473	/// to set the attributes on the function when it is first created.
4474	llvm::Constant *CodeGenModule::GetOrCreateLLVMFunction(
4475	StringRef MangledName, llvm::Type *Ty, GlobalDecl GD, bool ForVTable,
4476	bool DontDefer, bool IsThunk, llvm::AttributeList ExtraAttrs,
4477	ForDefinition_t IsForDefinition) {
4478	const Decl *D = GD.getDecl();
4479
4480	// Any attempts to use a MultiVersion function should result in retrieving
4481	// the iFunc instead. Name Mangling will handle the rest of the changes.
4482	if (const FunctionDecl *FD = cast_or_null<FunctionDecl>(Val: D)) {
4483	// For the device mark the function as one that should be emitted.
4484	if (getLangOpts().OpenMPIsTargetDevice && OpenMPRuntime &&
4485	!OpenMPRuntime->markAsGlobalTarget(GD) && FD->isDefined() &&
4486	!DontDefer && !IsForDefinition) {
4487	if (const FunctionDecl *FDDef = FD->getDefinition()) {
4488	GlobalDecl GDDef;
4489	if (const auto *CD = dyn_cast<CXXConstructorDecl>(Val: FDDef))
4490	GDDef = GlobalDecl(CD, GD.getCtorType());
4491	else if (const auto *DD = dyn_cast<CXXDestructorDecl>(Val: FDDef))
4492	GDDef = GlobalDecl(DD, GD.getDtorType());
4493	else
4494	GDDef = GlobalDecl(FDDef);
4495	EmitGlobal(GD: GDDef);
4496	}
4497	}
4498
4499	if (FD->isMultiVersion()) {
4500	UpdateMultiVersionNames(GD, FD, CurName&: MangledName);
4501	if (!IsForDefinition)
4502	return GetOrCreateMultiVersionResolver(GD);
4503	}
4504	}
4505
4506	// Lookup the entry, lazily creating it if necessary.
4507	llvm::GlobalValue *Entry = GetGlobalValue(Name: MangledName);
4508	if (Entry) {
4509	if (WeakRefReferences.erase(Ptr: Entry)) {
4510	const FunctionDecl *FD = cast_or_null<FunctionDecl>(Val: D);
4511	if (FD && !FD->hasAttr<WeakAttr>())
4512	Entry->setLinkage(llvm::Function::ExternalLinkage);
4513	}
4514
4515	// Handle dropped DLL attributes.
4516	if (D && !D->hasAttr<DLLImportAttr>() && !D->hasAttr<DLLExportAttr>() &&
4517	!shouldMapVisibilityToDLLExport(cast_or_null<NamedDecl>(D))) {
4518	Entry->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
4519	setDSOLocal(Entry);
4520	}
4521
4522	// If there are two attempts to define the same mangled name, issue an
4523	// error.
4524	if (IsForDefinition && !Entry->isDeclaration()) {
4525	GlobalDecl OtherGD;
4526	// Check that GD is not yet in DiagnosedConflictingDefinitions is required
4527	// to make sure that we issue an error only once.
4528	if (lookupRepresentativeDecl(MangledName, Result&: OtherGD) &&
4529	(GD.getCanonicalDecl().getDecl() !=
4530	OtherGD.getCanonicalDecl().getDecl()) &&
4531	DiagnosedConflictingDefinitions.insert(V: GD).second) {
4532	getDiags().Report(D->getLocation(), diag::err_duplicate_mangled_name)
4533	<< MangledName;
4534	getDiags().Report(OtherGD.getDecl()->getLocation(),
4535	diag::note_previous_definition);
4536	}
4537	}
4538
4539	if ((isa<llvm::Function>(Val: Entry) || isa<llvm::GlobalAlias>(Val: Entry)) &&
4540	(Entry->getValueType() == Ty)) {
4541	return Entry;
4542	}
4543
4544	// Make sure the result is of the correct type.
4545	// (If function is requested for a definition, we always need to create a new
4546	// function, not just return a bitcast.)
4547	if (!IsForDefinition)
4548	return Entry;
4549	}
4550
4551	// This function doesn't have a complete type (for example, the return
4552	// type is an incomplete struct). Use a fake type instead, and make
4553	// sure not to try to set attributes.
4554	bool IsIncompleteFunction = false;
4555
4556	llvm::FunctionType *FTy;
4557	if (isa<llvm::FunctionType>(Val: Ty)) {
4558	FTy = cast<llvm::FunctionType>(Val: Ty);
4559	} else {
4560	FTy = llvm::FunctionType::get(Result: VoidTy, isVarArg: false);
4561	IsIncompleteFunction = true;
4562	}
4563
4564	llvm::Function *F =
4565	llvm::Function::Create(Ty: FTy, Linkage: llvm::Function::ExternalLinkage,
4566	N: Entry ? StringRef() : MangledName, M: &getModule());
4567
4568	// Store the declaration associated with this function so it is potentially
4569	// updated by further declarations or definitions and emitted at the end.
4570	if (D && D->hasAttr<AnnotateAttr>())
4571	DeferredAnnotations[MangledName] = cast<ValueDecl>(Val: D);
4572
4573	// If we already created a function with the same mangled name (but different
4574	// type) before, take its name and add it to the list of functions to be
4575	// replaced with F at the end of CodeGen.
4576	//
4577	// This happens if there is a prototype for a function (e.g. "int f()") and
4578	// then a definition of a different type (e.g. "int f(int x)").
4579	if (Entry) {
4580	F->takeName(V: Entry);
4581
4582	// This might be an implementation of a function without a prototype, in
4583	// which case, try to do special replacement of calls which match the new
4584	// prototype. The really key thing here is that we also potentially drop
4585	// arguments from the call site so as to make a direct call, which makes the
4586	// inliner happier and suppresses a number of optimizer warnings (!) about
4587	// dropping arguments.
4588	if (!Entry->use_empty()) {
4589	ReplaceUsesOfNonProtoTypeWithRealFunction(Old: Entry, NewFn: F);
4590	Entry->removeDeadConstantUsers();
4591	}
4592
4593	addGlobalValReplacement(GV: Entry, C: F);
4594	}
4595
4596	assert(F->getName() == MangledName && "name was uniqued!");
4597	if (D)
4598	SetFunctionAttributes(GD, F, IsIncompleteFunction, IsThunk);
4599	if (ExtraAttrs.hasFnAttrs()) {
4600	llvm::AttrBuilder B(F->getContext(), ExtraAttrs.getFnAttrs());
4601	F->addFnAttrs(Attrs: B);
4602	}
4603
4604	if (!DontDefer) {
4605	// All MSVC dtors other than the base dtor are linkonce_odr and delegate to
4606	// each other bottoming out with the base dtor. Therefore we emit non-base
4607	// dtors on usage, even if there is no dtor definition in the TU.
4608	if (isa_and_nonnull<CXXDestructorDecl>(Val: D) &&
4609	getCXXABI().useThunkForDtorVariant(Dtor: cast<CXXDestructorDecl>(Val: D),
4610	DT: GD.getDtorType()))
4611	addDeferredDeclToEmit(GD);
4612
4613	// This is the first use or definition of a mangled name. If there is a
4614	// deferred decl with this name, remember that we need to emit it at the end
4615	// of the file.
4616	auto DDI = DeferredDecls.find(Val: MangledName);
4617	if (DDI != DeferredDecls.end()) {
4618	// Move the potentially referenced deferred decl to the
4619	// DeferredDeclsToEmit list, and remove it from DeferredDecls (since we
4620	// don't need it anymore).
4621	addDeferredDeclToEmit(GD: DDI->second);
4622	DeferredDecls.erase(I: DDI);
4623
4624	// Otherwise, there are cases we have to worry about where we're
4625	// using a declaration for which we must emit a definition but where
4626	// we might not find a top-level definition:
4627	// - member functions defined inline in their classes
4628	// - friend functions defined inline in some class
4629	// - special member functions with implicit definitions
4630	// If we ever change our AST traversal to walk into class methods,
4631	// this will be unnecessary.
4632	//
4633	// We also don't emit a definition for a function if it's going to be an
4634	// entry in a vtable, unless it's already marked as used.
4635	} else if (getLangOpts().CPlusPlus && D) {
4636	// Look for a declaration that's lexically in a record.
4637	for (const auto *FD = cast<FunctionDecl>(Val: D)->getMostRecentDecl(); FD;
4638	FD = FD->getPreviousDecl()) {
4639	if (isa<CXXRecordDecl>(FD->getLexicalDeclContext())) {
4640	if (FD->doesThisDeclarationHaveABody()) {
4641	addDeferredDeclToEmit(GD: GD.getWithDecl(D: FD));
4642	break;
4643	}
4644	}
4645	}
4646	}
4647	}
4648
4649	// Make sure the result is of the requested type.
4650	if (!IsIncompleteFunction) {
4651	assert(F->getFunctionType() == Ty);
4652	return F;
4653	}
4654
4655	return F;
4656	}
4657
4658	/// GetAddrOfFunction - Return the address of the given function. If Ty is
4659	/// non-null, then this function will use the specified type if it has to
4660	/// create it (this occurs when we see a definition of the function).
4661	llvm::Constant *
4662	CodeGenModule::GetAddrOfFunction(GlobalDecl GD, llvm::Type *Ty, bool ForVTable,
4663	bool DontDefer,
4664	ForDefinition_t IsForDefinition) {
4665	// If there was no specific requested type, just convert it now.
4666	if (!Ty) {
4667	const auto *FD = cast<FunctionDecl>(Val: GD.getDecl());
4668	Ty = getTypes().ConvertType(T: FD->getType());
4669	}
4670
4671	// Devirtualized destructor calls may come through here instead of via
4672	// getAddrOfCXXStructor. Make sure we use the MS ABI base destructor instead
4673	// of the complete destructor when necessary.
4674	if (const auto *DD = dyn_cast<CXXDestructorDecl>(Val: GD.getDecl())) {
4675	if (getTarget().getCXXABI().isMicrosoft() &&
4676	GD.getDtorType() == Dtor_Complete &&
4677	DD->getParent()->getNumVBases() == 0)
4678	GD = GlobalDecl(DD, Dtor_Base);
4679	}
4680
4681	StringRef MangledName = getMangledName(GD);
4682	auto *F = GetOrCreateLLVMFunction(MangledName, Ty, GD, ForVTable, DontDefer,
4683	/*IsThunk=*/false, ExtraAttrs: llvm::AttributeList(),
4684	IsForDefinition);
4685	// Returns kernel handle for HIP kernel stub function.
4686	if (LangOpts.CUDA && !LangOpts.CUDAIsDevice &&
4687	cast<FunctionDecl>(GD.getDecl())->hasAttr<CUDAGlobalAttr>()) {
4688	auto *Handle = getCUDARuntime().getKernelHandle(
4689	Stub: cast<llvm::Function>(Val: F->stripPointerCasts()), GD);
4690	if (IsForDefinition)
4691	return F;
4692	return Handle;
4693	}
4694	return F;
4695	}
4696
4697	llvm::Constant *CodeGenModule::GetFunctionStart(const ValueDecl *Decl) {
4698	llvm::GlobalValue *F =
4699	cast<llvm::GlobalValue>(Val: GetAddrOfFunction(Decl)->stripPointerCasts());
4700
4701	return llvm::NoCFIValue::get(GV: F);
4702	}
4703
4704	static const FunctionDecl *
4705	GetRuntimeFunctionDecl(ASTContext &C, StringRef Name) {
4706	TranslationUnitDecl *TUDecl = C.getTranslationUnitDecl();
4707	DeclContext *DC = TranslationUnitDecl::castToDeclContext(D: TUDecl);
4708
4709	IdentifierInfo &CII = C.Idents.get(Name);
4710	for (const auto *Result : DC->lookup(Name: &CII))
4711	if (const auto *FD = dyn_cast<FunctionDecl>(Val: Result))
4712	return FD;
4713
4714	if (!C.getLangOpts().CPlusPlus)
4715	return nullptr;
4716
4717	// Demangle the premangled name from getTerminateFn()
4718	IdentifierInfo &CXXII =
4719	(Name == "_ZSt9terminatev" || Name == "?terminate@@YAXXZ")
4720	? C.Idents.get(Name: "terminate")
4721	: C.Idents.get(Name);
4722
4723	for (const auto &N : {"__cxxabiv1", "std"}) {
4724	IdentifierInfo &NS = C.Idents.get(Name: N);
4725	for (const auto *Result : DC->lookup(Name: &NS)) {
4726	const NamespaceDecl *ND = dyn_cast<NamespaceDecl>(Val: Result);
4727	if (auto *LSD = dyn_cast<LinkageSpecDecl>(Result))
4728	for (const auto *Result : LSD->lookup(&NS))
4729	if ((ND = dyn_cast<NamespaceDecl>(Result)))
4730	break;
4731
4732	if (ND)
4733	for (const auto *Result : ND->lookup(&CXXII))
4734	if (const auto *FD = dyn_cast<FunctionDecl>(Result))
4735	return FD;
4736	}
4737	}
4738
4739	return nullptr;
4740	}
4741
4742	/// CreateRuntimeFunction - Create a new runtime function with the specified
4743	/// type and name.
4744	llvm::FunctionCallee
4745	CodeGenModule::CreateRuntimeFunction(llvm::FunctionType *FTy, StringRef Name,
4746	llvm::AttributeList ExtraAttrs, bool Local,
4747	bool AssumeConvergent) {
4748	if (AssumeConvergent) {
4749	ExtraAttrs =
4750	ExtraAttrs.addFnAttribute(VMContext, llvm::Attribute::Convergent);
4751	}
4752
4753	llvm::Constant *C =
4754	GetOrCreateLLVMFunction(MangledName: Name, Ty: FTy, GD: GlobalDecl(), /*ForVTable=*/false,
4755	/*DontDefer=*/false, /*IsThunk=*/false,
4756	ExtraAttrs);
4757
4758	if (auto *F = dyn_cast<llvm::Function>(Val: C)) {
4759	if (F->empty()) {
4760	F->setCallingConv(getRuntimeCC());
4761
4762	// In Windows Itanium environments, try to mark runtime functions
4763	// dllimport. For Mingw and MSVC, don't. We don't really know if the user
4764	// will link their standard library statically or dynamically. Marking
4765	// functions imported when they are not imported can cause linker errors
4766	// and warnings.
4767	if (!Local && getTriple().isWindowsItaniumEnvironment() &&
4768	!getCodeGenOpts().LTOVisibilityPublicStd) {
4769	const FunctionDecl *FD = GetRuntimeFunctionDecl(C&: Context, Name);
4770	if (!FD || FD->hasAttr<DLLImportAttr>()) {
4771	F->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
4772	F->setLinkage(llvm::GlobalValue::ExternalLinkage);
4773	}
4774	}
4775	setDSOLocal(F);
4776	}
4777	}
4778
4779	return {FTy, C};
4780	}
4781
4782	/// GetOrCreateLLVMGlobal - If the specified mangled name is not in the module,
4783	/// create and return an llvm GlobalVariable with the specified type and address
4784	/// space. If there is something in the module with the specified name, return
4785	/// it potentially bitcasted to the right type.
4786	///
4787	/// If D is non-null, it specifies a decl that correspond to this. This is used
4788	/// to set the attributes on the global when it is first created.
4789	///
4790	/// If IsForDefinition is true, it is guaranteed that an actual global with
4791	/// type Ty will be returned, not conversion of a variable with the same
4792	/// mangled name but some other type.
4793	llvm::Constant *
4794	CodeGenModule::GetOrCreateLLVMGlobal(StringRef MangledName, llvm::Type *Ty,
4795	LangAS AddrSpace, const VarDecl *D,
4796	ForDefinition_t IsForDefinition) {
4797	// Lookup the entry, lazily creating it if necessary.
4798	llvm::GlobalValue *Entry = GetGlobalValue(Name: MangledName);
4799	unsigned TargetAS = getContext().getTargetAddressSpace(AS: AddrSpace);
4800	if (Entry) {
4801	if (WeakRefReferences.erase(Ptr: Entry)) {
4802	if (D && !D->hasAttr<WeakAttr>())
4803	Entry->setLinkage(llvm::Function::ExternalLinkage);
4804	}
4805
4806	// Handle dropped DLL attributes.
4807	if (D && !D->hasAttr<DLLImportAttr>() && !D->hasAttr<DLLExportAttr>() &&
4808	!shouldMapVisibilityToDLLExport(D))
4809	Entry->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
4810
4811	if (LangOpts.OpenMP && !LangOpts.OpenMPSimd && D)
4812	getOpenMPRuntime().registerTargetGlobalVariable(VD: D, Addr: Entry);
4813
4814	if (Entry->getValueType() == Ty && Entry->getAddressSpace() == TargetAS)
4815	return Entry;
4816
4817	// If there are two attempts to define the same mangled name, issue an
4818	// error.
4819	if (IsForDefinition && !Entry->isDeclaration()) {
4820	GlobalDecl OtherGD;
4821	const VarDecl *OtherD;
4822
4823	// Check that D is not yet in DiagnosedConflictingDefinitions is required
4824	// to make sure that we issue an error only once.
4825	if (D && lookupRepresentativeDecl(MangledName, Result&: OtherGD) &&
4826	(D->getCanonicalDecl() != OtherGD.getCanonicalDecl().getDecl()) &&
4827	(OtherD = dyn_cast<VarDecl>(Val: OtherGD.getDecl())) &&
4828	OtherD->hasInit() &&
4829	DiagnosedConflictingDefinitions.insert(V: D).second) {
4830	getDiags().Report(D->getLocation(), diag::err_duplicate_mangled_name)
4831	<< MangledName;
4832	getDiags().Report(OtherGD.getDecl()->getLocation(),
4833	diag::note_previous_definition);
4834	}
4835	}
4836
4837	// Make sure the result is of the correct type.
4838	if (Entry->getType()->getAddressSpace() != TargetAS)
4839	return llvm::ConstantExpr::getAddrSpaceCast(
4840	C: Entry, Ty: llvm::PointerType::get(C&: Ty->getContext(), AddressSpace: TargetAS));
4841
4842	// (If global is requested for a definition, we always need to create a new
4843	// global, not just return a bitcast.)
4844	if (!IsForDefinition)
4845	return Entry;
4846	}
4847
4848	auto DAddrSpace = GetGlobalVarAddressSpace(D);
4849
4850	auto *GV = new llvm::GlobalVariable(
4851	getModule(), Ty, false, llvm::GlobalValue::ExternalLinkage, nullptr,
4852	MangledName, nullptr, llvm::GlobalVariable::NotThreadLocal,
4853	getContext().getTargetAddressSpace(AS: DAddrSpace));
4854
4855	// If we already created a global with the same mangled name (but different
4856	// type) before, take its name and remove it from its parent.
4857	if (Entry) {
4858	GV->takeName(V: Entry);
4859
4860	if (!Entry->use_empty()) {
4861	Entry->replaceAllUsesWith(V: GV);
4862	}
4863
4864	Entry->eraseFromParent();
4865	}
4866
4867	// This is the first use or definition of a mangled name. If there is a
4868	// deferred decl with this name, remember that we need to emit it at the end
4869	// of the file.
4870	auto DDI = DeferredDecls.find(Val: MangledName);
4871	if (DDI != DeferredDecls.end()) {
4872	// Move the potentially referenced deferred decl to the DeferredDeclsToEmit
4873	// list, and remove it from DeferredDecls (since we don't need it anymore).
4874	addDeferredDeclToEmit(GD: DDI->second);
4875	DeferredDecls.erase(I: DDI);
4876	}
4877
4878	// Handle things which are present even on external declarations.
4879	if (D) {
4880	if (LangOpts.OpenMP && !LangOpts.OpenMPSimd)
4881	getOpenMPRuntime().registerTargetGlobalVariable(VD: D, Addr: GV);
4882
4883	// FIXME: This code is overly simple and should be merged with other global
4884	// handling.
4885	GV->setConstant(D->getType().isConstantStorage(getContext(), false, false));
4886
4887	GV->setAlignment(getContext().getDeclAlign(D).getAsAlign());
4888
4889	setLinkageForGV(GV, D);
4890
4891	if (D->getTLSKind()) {
4892	if (D->getTLSKind() == VarDecl::TLS_Dynamic)
4893	CXXThreadLocals.push_back(x: D);
4894	setTLSMode(GV, D: *D);
4895	}
4896
4897	setGVProperties(GV, GD: D);
4898
4899	// If required by the ABI, treat declarations of static data members with
4900	// inline initializers as definitions.
4901	if (getContext().isMSStaticDataMemberInlineDefinition(VD: D)) {
4902	EmitGlobalVarDefinition(D);
4903	}
4904
4905	// Emit section information for extern variables.
4906	if (D->hasExternalStorage()) {
4907	if (const SectionAttr *SA = D->getAttr<SectionAttr>())
4908	GV->setSection(SA->getName());
4909	}
4910
4911	// Handle XCore specific ABI requirements.
4912	if (getTriple().getArch() == llvm::Triple::xcore &&
4913	D->getLanguageLinkage() == CLanguageLinkage &&
4914	D->getType().isConstant(Context) &&
4915	isExternallyVisible(D->getLinkageAndVisibility().getLinkage()))
4916	GV->setSection(".cp.rodata");
4917
4918	// Handle code model attribute
4919	if (const auto *CMA = D->getAttr<CodeModelAttr>())
4920	GV->setCodeModel(CMA->getModel());
4921
4922	// Check if we a have a const declaration with an initializer, we may be
4923	// able to emit it as available_externally to expose it's value to the
4924	// optimizer.
4925	if (Context.getLangOpts().CPlusPlus && GV->hasExternalLinkage() &&
4926	D->getType().isConstQualified() && !GV->hasInitializer() &&
4927	!D->hasDefinition() && D->hasInit() && !D->hasAttr<DLLImportAttr>()) {
4928	const auto *Record =
4929	Context.getBaseElementType(D->getType())->getAsCXXRecordDecl();
4930	bool HasMutableFields = Record && Record->hasMutableFields();
4931	if (!HasMutableFields) {
4932	const VarDecl *InitDecl;
4933	const Expr *InitExpr = D->getAnyInitializer(D&: InitDecl);
4934	if (InitExpr) {
4935	ConstantEmitter emitter(*this);
4936	llvm::Constant *Init = emitter.tryEmitForInitializer(D: *InitDecl);
4937	if (Init) {
4938	auto *InitType = Init->getType();
4939	if (GV->getValueType() != InitType) {
4940	// The type of the initializer does not match the definition.
4941	// This happens when an initializer has a different type from
4942	// the type of the global (because of padding at the end of a
4943	// structure for instance).
4944	GV->setName(StringRef());
4945	// Make a new global with the correct type, this is now guaranteed
4946	// to work.
4947	auto *NewGV = cast<llvm::GlobalVariable>(
4948	Val: GetAddrOfGlobalVar(D, Ty: InitType, IsForDefinition)
4949	->stripPointerCasts());
4950
4951	// Erase the old global, since it is no longer used.
4952	GV->eraseFromParent();
4953	GV = NewGV;
4954	} else {
4955	GV->setInitializer(Init);
4956	GV->setConstant(true);
4957	GV->setLinkage(llvm::GlobalValue::AvailableExternallyLinkage);
4958	}
4959	emitter.finalize(global: GV);
4960	}
4961	}
4962	}
4963	}
4964	}
4965
4966	if (D &&
4967	D->isThisDeclarationADefinition(Context) == VarDecl::DeclarationOnly) {
4968	getTargetCodeGenInfo().setTargetAttributes(D, GV, *this);
4969	// External HIP managed variables needed to be recorded for transformation
4970	// in both device and host compilations.
4971	if (getLangOpts().CUDA && D && D->hasAttr<HIPManagedAttr>() &&
4972	D->hasExternalStorage())
4973	getCUDARuntime().handleVarRegistration(VD: D, Var&: *GV);
4974	}
4975
4976	if (D)
4977	SanitizerMD->reportGlobal(GV, D: *D);
4978
4979	LangAS ExpectedAS =
4980	D ? D->getType().getAddressSpace()
4981	: (LangOpts.OpenCL ? LangAS::opencl_global : LangAS::Default);
4982	assert(getContext().getTargetAddressSpace(ExpectedAS) == TargetAS);
4983	if (DAddrSpace != ExpectedAS) {
4984	return getTargetCodeGenInfo().performAddrSpaceCast(
4985	CGM&: *this, V: GV, SrcAddr: DAddrSpace, DestAddr: ExpectedAS,
4986	DestTy: llvm::PointerType::get(C&: getLLVMContext(), AddressSpace: TargetAS));
4987	}
4988
4989	return GV;
4990	}
4991
4992	llvm::Constant *
4993	CodeGenModule::GetAddrOfGlobal(GlobalDecl GD, ForDefinition_t IsForDefinition) {
4994	const Decl *D = GD.getDecl();
4995
4996	if (isa<CXXConstructorDecl>(Val: D) || isa<CXXDestructorDecl>(Val: D))
4997	return getAddrOfCXXStructor(GD, /*FnInfo=*/nullptr, /*FnType=*/nullptr,
4998	/*DontDefer=*/false, IsForDefinition);
4999
5000	if (isa<CXXMethodDecl>(Val: D)) {
5001	auto FInfo =
5002	&getTypes().arrangeCXXMethodDeclaration(MD: cast<CXXMethodDecl>(Val: D));
5003	auto Ty = getTypes().GetFunctionType(Info: *FInfo);
5004	return GetAddrOfFunction(GD, Ty, /*ForVTable=*/false, /*DontDefer=*/false,
5005	IsForDefinition);
5006	}
5007
5008	if (isa<FunctionDecl>(Val: D)) {
5009	const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
5010	llvm::FunctionType *Ty = getTypes().GetFunctionType(Info: FI);
5011	return GetAddrOfFunction(GD, Ty, /*ForVTable=*/false, /*DontDefer=*/false,
5012	IsForDefinition);
5013	}
5014
5015	return GetAddrOfGlobalVar(D: cast<VarDecl>(Val: D), /*Ty=*/nullptr, IsForDefinition);
5016	}
5017
5018	llvm::GlobalVariable *CodeGenModule::CreateOrReplaceCXXRuntimeVariable(
5019	StringRef Name, llvm::Type *Ty, llvm::GlobalValue::LinkageTypes Linkage,
5020	llvm::Align Alignment) {
5021	llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name);
5022	llvm::GlobalVariable *OldGV = nullptr;
5023
5024	if (GV) {
5025	// Check if the variable has the right type.
5026	if (GV->getValueType() == Ty)
5027	return GV;
5028
5029	// Because C++ name mangling, the only way we can end up with an already
5030	// existing global with the same name is if it has been declared extern "C".
5031	assert(GV->isDeclaration() && "Declaration has wrong type!");
5032	OldGV = GV;
5033	}
5034
5035	// Create a new variable.
5036	GV = new llvm::GlobalVariable(getModule(), Ty, /*isConstant=*/true,
5037	Linkage, nullptr, Name);
5038
5039	if (OldGV) {
5040	// Replace occurrences of the old variable if needed.
5041	GV->takeName(V: OldGV);
5042
5043	if (!OldGV->use_empty()) {
5044	OldGV->replaceAllUsesWith(V: GV);
5045	}
5046
5047	OldGV->eraseFromParent();
5048	}
5049
5050	if (supportsCOMDAT() && GV->isWeakForLinker() &&
5051	!GV->hasAvailableExternallyLinkage())
5052	GV->setComdat(TheModule.getOrInsertComdat(Name: GV->getName()));
5053
5054	GV->setAlignment(Alignment);
5055
5056	return GV;
5057	}
5058
5059	/// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the
5060	/// given global variable. If Ty is non-null and if the global doesn't exist,
5061	/// then it will be created with the specified type instead of whatever the
5062	/// normal requested type would be. If IsForDefinition is true, it is guaranteed
5063	/// that an actual global with type Ty will be returned, not conversion of a
5064	/// variable with the same mangled name but some other type.
5065	llvm::Constant *CodeGenModule::GetAddrOfGlobalVar(const VarDecl *D,
5066	llvm::Type *Ty,
5067	ForDefinition_t IsForDefinition) {
5068	assert(D->hasGlobalStorage() && "Not a global variable");
5069	QualType ASTTy = D->getType();
5070	if (!Ty)
5071	Ty = getTypes().ConvertTypeForMem(T: ASTTy);
5072
5073	StringRef MangledName = getMangledName(GD: D);
5074	return GetOrCreateLLVMGlobal(MangledName, Ty, AddrSpace: ASTTy.getAddressSpace(), D,
5075	IsForDefinition);
5076	}
5077
5078	/// CreateRuntimeVariable - Create a new runtime global variable with the
5079	/// specified type and name.
5080	llvm::Constant *
5081	CodeGenModule::CreateRuntimeVariable(llvm::Type *Ty,
5082	StringRef Name) {
5083	LangAS AddrSpace = getContext().getLangOpts().OpenCL ? LangAS::opencl_global
5084	: LangAS::Default;
5085	auto *Ret = GetOrCreateLLVMGlobal(MangledName: Name, Ty, AddrSpace, D: nullptr);
5086	setDSOLocal(cast<llvm::GlobalValue>(Val: Ret->stripPointerCasts()));
5087	return Ret;
5088	}
5089
5090	void CodeGenModule::EmitTentativeDefinition(const VarDecl *D) {
5091	assert(!D->getInit() && "Cannot emit definite definitions here!");
5092
5093	StringRef MangledName = getMangledName(GD: D);
5094	llvm::GlobalValue *GV = GetGlobalValue(Name: MangledName);
5095
5096	// We already have a definition, not declaration, with the same mangled name.
5097	// Emitting of declaration is not required (and actually overwrites emitted
5098	// definition).
5099	if (GV && !GV->isDeclaration())
5100	return;
5101
5102	// If we have not seen a reference to this variable yet, place it into the
5103	// deferred declarations table to be emitted if needed later.
5104	if (!MustBeEmitted(D) && !GV) {
5105	DeferredDecls[MangledName] = D;
5106	return;
5107	}
5108
5109	// The tentative definition is the only definition.
5110	EmitGlobalVarDefinition(D);
5111	}
5112
5113	void CodeGenModule::EmitExternalDeclaration(const VarDecl *D) {
5114	EmitExternalVarDeclaration(D);
5115	}
5116
5117	CharUnits CodeGenModule::GetTargetTypeStoreSize(llvm::Type *Ty) const {
5118	return Context.toCharUnitsFromBits(
5119	BitSize: getDataLayout().getTypeStoreSizeInBits(Ty));
5120	}
5121
5122	LangAS CodeGenModule::GetGlobalVarAddressSpace(const VarDecl *D) {
5123	if (LangOpts.OpenCL) {
5124	LangAS AS = D ? D->getType().getAddressSpace() : LangAS::opencl_global;
5125	assert(AS == LangAS::opencl_global ||
5126	AS == LangAS::opencl_global_device ||
5127	AS == LangAS::opencl_global_host ||
5128	AS == LangAS::opencl_constant ||
5129	AS == LangAS::opencl_local ||
5130	AS >= LangAS::FirstTargetAddressSpace);
5131	return AS;
5132	}
5133
5134	if (LangOpts.SYCLIsDevice &&
5135	(!D || D->getType().getAddressSpace() == LangAS::Default))
5136	return LangAS::sycl_global;
5137
5138	if (LangOpts.CUDA && LangOpts.CUDAIsDevice) {
5139	if (D) {
5140	if (D->hasAttr<CUDAConstantAttr>())
5141	return LangAS::cuda_constant;
5142	if (D->hasAttr<CUDASharedAttr>())
5143	return LangAS::cuda_shared;
5144	if (D->hasAttr<CUDADeviceAttr>())
5145	return LangAS::cuda_device;
5146	if (D->getType().isConstQualified())
5147	return LangAS::cuda_constant;
5148	}
5149	return LangAS::cuda_device;
5150	}
5151
5152	if (LangOpts.OpenMP) {
5153	LangAS AS;
5154	if (OpenMPRuntime->hasAllocateAttributeForGlobalVar(VD: D, AS))
5155	return AS;
5156	}
5157	return getTargetCodeGenInfo().getGlobalVarAddressSpace(CGM&: *this, D);
5158	}
5159
5160	LangAS CodeGenModule::GetGlobalConstantAddressSpace() const {
5161	// OpenCL v1.2 s6.5.3: a string literal is in the constant address space.
5162	if (LangOpts.OpenCL)
5163	return LangAS::opencl_constant;
5164	if (LangOpts.SYCLIsDevice)
5165	return LangAS::sycl_global;
5166	if (LangOpts.HIP && LangOpts.CUDAIsDevice && getTriple().isSPIRV())
5167	// For HIPSPV map literals to cuda_device (maps to CrossWorkGroup in SPIR-V)
5168	// instead of default AS (maps to Generic in SPIR-V). Otherwise, we end up
5169	// with OpVariable instructions with Generic storage class which is not
5170	// allowed (SPIR-V V1.6 s3.42.8). Also, mapping literals to SPIR-V
5171	// UniformConstant storage class is not viable as pointers to it may not be
5172	// casted to Generic pointers which are used to model HIP's "flat" pointers.
5173	return LangAS::cuda_device;
5174	if (auto AS = getTarget().getConstantAddressSpace())
5175	return *AS;
5176	return LangAS::Default;
5177	}
5178
5179	// In address space agnostic languages, string literals are in default address
5180	// space in AST. However, certain targets (e.g. amdgcn) request them to be
5181	// emitted in constant address space in LLVM IR. To be consistent with other
5182	// parts of AST, string literal global variables in constant address space
5183	// need to be casted to default address space before being put into address
5184	// map and referenced by other part of CodeGen.
5185	// In OpenCL, string literals are in constant address space in AST, therefore
5186	// they should not be casted to default address space.
5187	static llvm::Constant *
5188	castStringLiteralToDefaultAddressSpace(CodeGenModule &CGM,
5189	llvm::GlobalVariable *GV) {
5190	llvm::Constant *Cast = GV;
5191	if (!CGM.getLangOpts().OpenCL) {
5192	auto AS = CGM.GetGlobalConstantAddressSpace();
5193	if (AS != LangAS::Default)
5194	Cast = CGM.getTargetCodeGenInfo().performAddrSpaceCast(
5195	CGM, V: GV, SrcAddr: AS, DestAddr: LangAS::Default,
5196	DestTy: llvm::PointerType::get(
5197	C&: CGM.getLLVMContext(),
5198	AddressSpace: CGM.getContext().getTargetAddressSpace(AS: LangAS::Default)));
5199	}
5200	return Cast;
5201	}
5202
5203	template<typename SomeDecl>
5204	void CodeGenModule::MaybeHandleStaticInExternC(const SomeDecl *D,
5205	llvm::GlobalValue *GV) {
5206	if (!getLangOpts().CPlusPlus)
5207	return;
5208
5209	// Must have 'used' attribute, or else inline assembly can't rely on
5210	// the name existing.
5211	if (!D->template hasAttr<UsedAttr>())
5212	return;
5213
5214	// Must have internal linkage and an ordinary name.
5215	if (!D->getIdentifier() || D->getFormalLinkage() != Linkage::Internal)
5216	return;
5217
5218	// Must be in an extern "C" context. Entities declared directly within
5219	// a record are not extern "C" even if the record is in such a context.
5220	const SomeDecl *First = D->getFirstDecl();
5221	if (First->getDeclContext()->isRecord() || !First->isInExternCContext())
5222	return;
5223
5224	// OK, this is an internal linkage entity inside an extern "C" linkage
5225	// specification. Make a note of that so we can give it the "expected"
5226	// mangled name if nothing else is using that name.
5227	std::pair<StaticExternCMap::iterator, bool> R =
5228	StaticExternCValues.insert(std::make_pair(D->getIdentifier(), GV));
5229
5230	// If we have multiple internal linkage entities with the same name
5231	// in extern "C" regions, none of them gets that name.
5232	if (!R.second)
5233	R.first->second = nullptr;
5234	}
5235
5236	static bool shouldBeInCOMDAT(CodeGenModule &CGM, const Decl &D) {
5237	if (!CGM.supportsCOMDAT())
5238	return false;
5239
5240	if (D.hasAttr<SelectAnyAttr>())
5241	return true;
5242
5243	GVALinkage Linkage;
5244	if (auto *VD = dyn_cast<VarDecl>(Val: &D))
5245	Linkage = CGM.getContext().GetGVALinkageForVariable(VD);
5246	else
5247	Linkage = CGM.getContext().GetGVALinkageForFunction(FD: cast<FunctionDecl>(Val: &D));
5248
5249	switch (Linkage) {
5250	case GVA_Internal:
5251	case GVA_AvailableExternally:
5252	case GVA_StrongExternal:
5253	return false;
5254	case GVA_DiscardableODR:
5255	case GVA_StrongODR:
5256	return true;
5257	}
5258	llvm_unreachable("No such linkage");
5259	}
5260
5261	bool CodeGenModule::supportsCOMDAT() const {
5262	return getTriple().supportsCOMDAT();
5263	}
5264
5265	void CodeGenModule::maybeSetTrivialComdat(const Decl &D,
5266	llvm::GlobalObject &GO) {
5267	if (!shouldBeInCOMDAT(CGM&: *this, D))
5268	return;
5269	GO.setComdat(TheModule.getOrInsertComdat(Name: GO.getName()));
5270	}
5271
5272	/// Pass IsTentative as true if you want to create a tentative definition.
5273	void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D,
5274	bool IsTentative) {
5275	// OpenCL global variables of sampler type are translated to function calls,
5276	// therefore no need to be translated.
5277	QualType ASTTy = D->getType();
5278	if (getLangOpts().OpenCL && ASTTy->isSamplerT())
5279	return;
5280
5281	// If this is OpenMP device, check if it is legal to emit this global
5282	// normally.
5283	if (LangOpts.OpenMPIsTargetDevice && OpenMPRuntime &&
5284	OpenMPRuntime->emitTargetGlobalVariable(GD: D))
5285	return;
5286
5287	llvm::TrackingVH<llvm::Constant> Init;
5288	bool NeedsGlobalCtor = false;
5289	// Whether the definition of the variable is available externally.
5290	// If yes, we shouldn't emit the GloablCtor and GlobalDtor for the variable
5291	// since this is the job for its original source.
5292	bool IsDefinitionAvailableExternally =
5293	getContext().GetGVALinkageForVariable(VD: D) == GVA_AvailableExternally;
5294	bool NeedsGlobalDtor =
5295	!IsDefinitionAvailableExternally &&
5296	D->needsDestruction(Ctx: getContext()) == QualType::DK_cxx_destructor;
5297
5298	const VarDecl *InitDecl;
5299	const Expr *InitExpr = D->getAnyInitializer(D&: InitDecl);
5300
5301	std::optional<ConstantEmitter> emitter;
5302
5303	// CUDA E.2.4.1 "__shared__ variables cannot have an initialization
5304	// as part of their declaration." Sema has already checked for
5305	// error cases, so we just need to set Init to UndefValue.
5306	bool IsCUDASharedVar =
5307	getLangOpts().CUDAIsDevice && D->hasAttr<CUDASharedAttr>();
5308	// Shadows of initialized device-side global variables are also left
5309	// undefined.
5310	// Managed Variables should be initialized on both host side and device side.
5311	bool IsCUDAShadowVar =
5312	!getLangOpts().CUDAIsDevice && !D->hasAttr<HIPManagedAttr>() &&
5313	(D->hasAttr<CUDAConstantAttr>() || D->hasAttr<CUDADeviceAttr>() ||
5314	D->hasAttr<CUDASharedAttr>());
5315	bool IsCUDADeviceShadowVar =
5316	getLangOpts().CUDAIsDevice && !D->hasAttr<HIPManagedAttr>() &&
5317	(D->getType()->isCUDADeviceBuiltinSurfaceType() ||
5318	D->getType()->isCUDADeviceBuiltinTextureType());
5319	if (getLangOpts().CUDA &&
5320	(IsCUDASharedVar || IsCUDAShadowVar || IsCUDADeviceShadowVar))
5321	Init = llvm::UndefValue::get(T: getTypes().ConvertTypeForMem(T: ASTTy));
5322	else if (D->hasAttr<LoaderUninitializedAttr>())
5323	Init = llvm::UndefValue::get(T: getTypes().ConvertTypeForMem(T: ASTTy));
5324	else if (!InitExpr) {
5325	// This is a tentative definition; tentative definitions are
5326	// implicitly initialized with { 0 }.
5327	//
5328	// Note that tentative definitions are only emitted at the end of
5329	// a translation unit, so they should never have incomplete
5330	// type. In addition, EmitTentativeDefinition makes sure that we
5331	// never attempt to emit a tentative definition if a real one
5332	// exists. A use may still exists, however, so we still may need
5333	// to do a RAUW.
5334	assert(!ASTTy->isIncompleteType() && "Unexpected incomplete type");
5335	Init = EmitNullConstant(T: D->getType());
5336	} else {
5337	initializedGlobalDecl = GlobalDecl(D);
5338	emitter.emplace(args&: *this);
5339	llvm::Constant *Initializer = emitter->tryEmitForInitializer(D: *InitDecl);
5340	if (!Initializer) {
5341	QualType T = InitExpr->getType();
5342	if (D->getType()->isReferenceType())
5343	T = D->getType();
5344
5345	if (getLangOpts().CPlusPlus) {
5346	if (InitDecl->hasFlexibleArrayInit(Ctx: getContext()))
5347	ErrorUnsupported(D, "flexible array initializer");
5348	Init = EmitNullConstant(T);
5349
5350	if (!IsDefinitionAvailableExternally)
5351	NeedsGlobalCtor = true;
5352	} else {
5353	ErrorUnsupported(D, "static initializer");
5354	Init = llvm::UndefValue::get(T: getTypes().ConvertType(T));
5355	}
5356	} else {
5357	Init = Initializer;
5358	// We don't need an initializer, so remove the entry for the delayed
5359	// initializer position (just in case this entry was delayed) if we
5360	// also don't need to register a destructor.
5361	if (getLangOpts().CPlusPlus && !NeedsGlobalDtor)
5362	DelayedCXXInitPosition.erase(D);
5363
5364	#ifndef NDEBUG
5365	CharUnits VarSize = getContext().getTypeSizeInChars(T: ASTTy) +
5366	InitDecl->getFlexibleArrayInitChars(Ctx: getContext());
5367	CharUnits CstSize = CharUnits::fromQuantity(
5368	Quantity: getDataLayout().getTypeAllocSize(Ty: Init->getType()));
5369	assert(VarSize == CstSize && "Emitted constant has unexpected size");
5370	#endif
5371	}
5372	}
5373
5374	llvm::Type* InitType = Init->getType();
5375	llvm::Constant *Entry =
5376	GetAddrOfGlobalVar(D, Ty: InitType, IsForDefinition: ForDefinition_t(!IsTentative));
5377
5378	// Strip off pointer casts if we got them.
5379	Entry = Entry->stripPointerCasts();
5380
5381	// Entry is now either a Function or GlobalVariable.
5382	auto *GV = dyn_cast<llvm::GlobalVariable>(Val: Entry);
5383
5384	// We have a definition after a declaration with the wrong type.
5385	// We must make a new GlobalVariable* and update everything that used OldGV
5386	// (a declaration or tentative definition) with the new GlobalVariable*
5387	// (which will be a definition).
5388	//
5389	// This happens if there is a prototype for a global (e.g.
5390	// "extern int x[];") and then a definition of a different type (e.g.
5391	// "int x[10];"). This also happens when an initializer has a different type
5392	// from the type of the global (this happens with unions).
5393	if (!GV || GV->getValueType() != InitType ||
5394	GV->getType()->getAddressSpace() !=
5395	getContext().getTargetAddressSpace(AS: GetGlobalVarAddressSpace(D))) {
5396
5397	// Move the old entry aside so that we'll create a new one.
5398	Entry->setName(StringRef());
5399
5400	// Make a new global with the correct type, this is now guaranteed to work.
5401	GV = cast<llvm::GlobalVariable>(
5402	Val: GetAddrOfGlobalVar(D, Ty: InitType, IsForDefinition: ForDefinition_t(!IsTentative))
5403	->stripPointerCasts());
5404
5405	// Replace all uses of the old global with the new global
5406	llvm::Constant *NewPtrForOldDecl =
5407	llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(C: GV,
5408	Ty: Entry->getType());
5409	Entry->replaceAllUsesWith(V: NewPtrForOldDecl);
5410
5411	// Erase the old global, since it is no longer used.
5412	cast<llvm::GlobalValue>(Val: Entry)->eraseFromParent();
5413	}
5414
5415	MaybeHandleStaticInExternC(D, GV);
5416
5417	if (D->hasAttr<AnnotateAttr>())
5418	AddGlobalAnnotations(D, GV);
5419
5420	// Set the llvm linkage type as appropriate.
5421	llvm::GlobalValue::LinkageTypes Linkage = getLLVMLinkageVarDefinition(VD: D);
5422
5423	// CUDA B.2.1 "The __device__ qualifier declares a variable that resides on
5424	// the device. [...]"
5425	// CUDA B.2.2 "The __constant__ qualifier, optionally used together with
5426	// __device__, declares a variable that: [...]
5427	// Is accessible from all the threads within the grid and from the host
5428	// through the runtime library (cudaGetSymbolAddress() / cudaGetSymbolSize()
5429	// / cudaMemcpyToSymbol() / cudaMemcpyFromSymbol())."
5430	if (LangOpts.CUDA) {
5431	if (LangOpts.CUDAIsDevice) {
5432	if (Linkage != llvm::GlobalValue::InternalLinkage &&
5433	(D->hasAttr<CUDADeviceAttr>() || D->hasAttr<CUDAConstantAttr>() ||
5434	D->getType()->isCUDADeviceBuiltinSurfaceType() ||
5435	D->getType()->isCUDADeviceBuiltinTextureType()))
5436	GV->setExternallyInitialized(true);
5437	} else {
5438	getCUDARuntime().internalizeDeviceSideVar(D, Linkage);
5439	}
5440	getCUDARuntime().handleVarRegistration(VD: D, Var&: *GV);
5441	}
5442
5443	GV->setInitializer(Init);
5444	if (emitter)
5445	emitter->finalize(global: GV);
5446
5447	// If it is safe to mark the global 'constant', do so now.
5448	GV->setConstant(!NeedsGlobalCtor && !NeedsGlobalDtor &&
5449	D->getType().isConstantStorage(getContext(), true, true));
5450
5451	// If it is in a read-only section, mark it 'constant'.
5452	if (const SectionAttr *SA = D->getAttr<SectionAttr>()) {
5453	const ASTContext::SectionInfo &SI = Context.SectionInfos[SA->getName()];
5454	if ((SI.SectionFlags & ASTContext::PSF_Write) == 0)
5455	GV->setConstant(true);
5456	}
5457
5458	CharUnits AlignVal = getContext().getDeclAlign(D);
5459	// Check for alignment specifed in an 'omp allocate' directive.
5460	if (std::optional<CharUnits> AlignValFromAllocate =
5461	getOMPAllocateAlignment(VD: D))
5462	AlignVal = *AlignValFromAllocate;
5463	GV->setAlignment(AlignVal.getAsAlign());
5464
5465	// On Darwin, unlike other Itanium C++ ABI platforms, the thread-wrapper
5466	// function is only defined alongside the variable, not also alongside
5467	// callers. Normally, all accesses to a thread_local go through the
5468	// thread-wrapper in order to ensure initialization has occurred, underlying
5469	// variable will never be used other than the thread-wrapper, so it can be
5470	// converted to internal linkage.
5471	//
5472	// However, if the variable has the 'constinit' attribute, it _can_ be
5473	// referenced directly, without calling the thread-wrapper, so the linkage
5474	// must not be changed.
5475	//
5476	// Additionally, if the variable isn't plain external linkage, e.g. if it's
5477	// weak or linkonce, the de-duplication semantics are important to preserve,
5478	// so we don't change the linkage.
5479	if (D->getTLSKind() == VarDecl::TLS_Dynamic &&
5480	Linkage == llvm::GlobalValue::ExternalLinkage &&
5481	Context.getTargetInfo().getTriple().isOSDarwin() &&
5482	!D->hasAttr<ConstInitAttr>())
5483	Linkage = llvm::GlobalValue::InternalLinkage;
5484
5485	GV->setLinkage(Linkage);
5486	if (D->hasAttr<DLLImportAttr>())
5487	GV->setDLLStorageClass(llvm::GlobalVariable::DLLImportStorageClass);
5488	else if (D->hasAttr<DLLExportAttr>())
5489	GV->setDLLStorageClass(llvm::GlobalVariable::DLLExportStorageClass);
5490	else
5491	GV->setDLLStorageClass(llvm::GlobalVariable::DefaultStorageClass);
5492
5493	if (Linkage == llvm::GlobalVariable::CommonLinkage) {
5494	// common vars aren't constant even if declared const.
5495	GV->setConstant(false);
5496	// Tentative definition of global variables may be initialized with
5497	// non-zero null pointers. In this case they should have weak linkage
5498	// since common linkage must have zero initializer and must not have
5499	// explicit section therefore cannot have non-zero initial value.
5500	if (!GV->getInitializer()->isNullValue())
5501	GV->setLinkage(llvm::GlobalVariable::WeakAnyLinkage);
5502	}
5503
5504	setNonAliasAttributes(GD: D, GO: GV);
5505
5506	if (D->getTLSKind() && !GV->isThreadLocal()) {
5507	if (D->getTLSKind() == VarDecl::TLS_Dynamic)
5508	CXXThreadLocals.push_back(x: D);
5509	setTLSMode(GV, D: *D);
5510	}
5511
5512	maybeSetTrivialComdat(*D, *GV);
5513
5514	// Emit the initializer function if necessary.
5515	if (NeedsGlobalCtor || NeedsGlobalDtor)
5516	EmitCXXGlobalVarDeclInitFunc(D, Addr: GV, PerformInit: NeedsGlobalCtor);
5517
5518	SanitizerMD->reportGlobal(GV, D: *D, IsDynInit: NeedsGlobalCtor);
5519
5520	// Emit global variable debug information.
5521	if (CGDebugInfo *DI = getModuleDebugInfo())
5522	if (getCodeGenOpts().hasReducedDebugInfo())
5523	DI->EmitGlobalVariable(GV, Decl: D);
5524	}
5525
5526	void CodeGenModule::EmitExternalVarDeclaration(const VarDecl *D) {
5527	if (CGDebugInfo *DI = getModuleDebugInfo())
5528	if (getCodeGenOpts().hasReducedDebugInfo()) {
5529	QualType ASTTy = D->getType();
5530	llvm::Type *Ty = getTypes().ConvertTypeForMem(T: D->getType());
5531	llvm::Constant *GV =
5532	GetOrCreateLLVMGlobal(MangledName: D->getName(), Ty, AddrSpace: ASTTy.getAddressSpace(), D);
5533	DI->EmitExternalVariable(
5534	GV: cast<llvm::GlobalVariable>(Val: GV->stripPointerCasts()), Decl: D);
5535	}
5536	}
5537
5538	static bool isVarDeclStrongDefinition(const ASTContext &Context,
5539	CodeGenModule &CGM, const VarDecl *D,
5540	bool NoCommon) {
5541	// Don't give variables common linkage if -fno-common was specified unless it
5542	// was overridden by a NoCommon attribute.
5543	if ((NoCommon || D->hasAttr<NoCommonAttr>()) && !D->hasAttr<CommonAttr>())
5544	return true;
5545
5546	// C11 6.9.2/2:
5547	// A declaration of an identifier for an object that has file scope without
5548	// an initializer, and without a storage-class specifier or with the
5549	// storage-class specifier static, constitutes a tentative definition.
5550	if (D->getInit() || D->hasExternalStorage())
5551	return true;
5552
5553	// A variable cannot be both common and exist in a section.
5554	if (D->hasAttr<SectionAttr>())
5555	return true;
5556
5557	// A variable cannot be both common and exist in a section.
5558	// We don't try to determine which is the right section in the front-end.
5559	// If no specialized section name is applicable, it will resort to default.
5560	if (D->hasAttr<PragmaClangBSSSectionAttr>() ||
5561	D->hasAttr<PragmaClangDataSectionAttr>() ||
5562	D->hasAttr<PragmaClangRelroSectionAttr>() ||
5563	D->hasAttr<PragmaClangRodataSectionAttr>())
5564	return true;
5565
5566	// Thread local vars aren't considered common linkage.
5567	if (D->getTLSKind())
5568	return true;
5569
5570	// Tentative definitions marked with WeakImportAttr are true definitions.
5571	if (D->hasAttr<WeakImportAttr>())
5572	return true;
5573
5574	// A variable cannot be both common and exist in a comdat.
5575	if (shouldBeInCOMDAT(CGM, *D))
5576	return true;
5577
5578	// Declarations with a required alignment do not have common linkage in MSVC
5579	// mode.
5580	if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
5581	if (D->hasAttr<AlignedAttr>())
5582	return true;
5583	QualType VarType = D->getType();
5584	if (Context.isAlignmentRequired(T: VarType))
5585	return true;
5586
5587	if (const auto *RT = VarType->getAs<RecordType>()) {
5588	const RecordDecl *RD = RT->getDecl();
5589	for (const FieldDecl *FD : RD->fields()) {
5590	if (FD->isBitField())
5591	continue;
5592	if (FD->hasAttr<AlignedAttr>())
5593	return true;
5594	if (Context.isAlignmentRequired(FD->getType()))
5595	return true;
5596	}
5597	}
5598	}
5599
5600	// Microsoft's link.exe doesn't support alignments greater than 32 bytes for
5601	// common symbols, so symbols with greater alignment requirements cannot be
5602	// common.
5603	// Other COFF linkers (ld.bfd and LLD) support arbitrary power-of-two
5604	// alignments for common symbols via the aligncomm directive, so this
5605	// restriction only applies to MSVC environments.
5606	if (Context.getTargetInfo().getTriple().isKnownWindowsMSVCEnvironment() &&
5607	Context.getTypeAlignIfKnown(T: D->getType()) >
5608	Context.toBits(CharSize: CharUnits::fromQuantity(Quantity: 32)))
5609	return true;
5610
5611	return false;
5612	}
5613
5614	llvm::GlobalValue::LinkageTypes
5615	CodeGenModule::getLLVMLinkageForDeclarator(const DeclaratorDecl *D,
5616	GVALinkage Linkage) {
5617	if (Linkage == GVA_Internal)
5618	return llvm::Function::InternalLinkage;
5619
5620	if (D->hasAttr<WeakAttr>())
5621	return llvm::GlobalVariable::WeakAnyLinkage;
5622
5623	if (const auto *FD = D->getAsFunction())
5624	if (FD->isMultiVersion() && Linkage == GVA_AvailableExternally)
5625	return llvm::GlobalVariable::LinkOnceAnyLinkage;
5626
5627	// We are guaranteed to have a strong definition somewhere else,
5628	// so we can use available_externally linkage.
5629	if (Linkage == GVA_AvailableExternally)
5630	return llvm::GlobalValue::AvailableExternallyLinkage;
5631
5632	// Note that Apple's kernel linker doesn't support symbol
5633	// coalescing, so we need to avoid linkonce and weak linkages there.
5634	// Normally, this means we just map to internal, but for explicit
5635	// instantiations we'll map to external.
5636
5637	// In C++, the compiler has to emit a definition in every translation unit
5638	// that references the function. We should use linkonce_odr because
5639	// a) if all references in this translation unit are optimized away, we
5640	// don't need to codegen it. b) if the function persists, it needs to be
5641	// merged with other definitions. c) C++ has the ODR, so we know the
5642	// definition is dependable.
5643	if (Linkage == GVA_DiscardableODR)
5644	return !Context.getLangOpts().AppleKext ? llvm::Function::LinkOnceODRLinkage
5645	: llvm::Function::InternalLinkage;
5646
5647	// An explicit instantiation of a template has weak linkage, since
5648	// explicit instantiations can occur in multiple translation units
5649	// and must all be equivalent. However, we are not allowed to
5650	// throw away these explicit instantiations.
5651	//
5652	// CUDA/HIP: For -fno-gpu-rdc case, device code is limited to one TU,
5653	// so say that CUDA templates are either external (for kernels) or internal.
5654	// This lets llvm perform aggressive inter-procedural optimizations. For
5655	// -fgpu-rdc case, device function calls across multiple TU's are allowed,
5656	// therefore we need to follow the normal linkage paradigm.
5657	if (Linkage == GVA_StrongODR) {
5658	if (getLangOpts().AppleKext)
5659	return llvm::Function::ExternalLinkage;
5660	if (getLangOpts().CUDA && getLangOpts().CUDAIsDevice &&
5661	!getLangOpts().GPURelocatableDeviceCode)
5662	return D->hasAttr<CUDAGlobalAttr>() ? llvm::Function::ExternalLinkage
5663	: llvm::Function::InternalLinkage;
5664	return llvm::Function::WeakODRLinkage;
5665	}
5666
5667	// C++ doesn't have tentative definitions and thus cannot have common
5668	// linkage.
5669	if (!getLangOpts().CPlusPlus && isa<VarDecl>(Val: D) &&
5670	!isVarDeclStrongDefinition(Context, CGM&: *this, D: cast<VarDecl>(Val: D),
5671	NoCommon: CodeGenOpts.NoCommon))
5672	return llvm::GlobalVariable::CommonLinkage;
5673
5674	// selectany symbols are externally visible, so use weak instead of
5675	// linkonce. MSVC optimizes away references to const selectany globals, so
5676	// all definitions should be the same and ODR linkage should be used.
5677	// http://msdn.microsoft.com/en-us/library/5tkz6s71.aspx
5678	if (D->hasAttr<SelectAnyAttr>())
5679	return llvm::GlobalVariable::WeakODRLinkage;
5680
5681	// Otherwise, we have strong external linkage.
5682	assert(Linkage == GVA_StrongExternal);
5683	return llvm::GlobalVariable::ExternalLinkage;
5684	}
5685
5686	llvm::GlobalValue::LinkageTypes
5687	CodeGenModule::getLLVMLinkageVarDefinition(const VarDecl *VD) {
5688	GVALinkage Linkage = getContext().GetGVALinkageForVariable(VD);
5689	return getLLVMLinkageForDeclarator(VD, Linkage);
5690	}
5691
5692	/// Replace the uses of a function that was declared with a non-proto type.
5693	/// We want to silently drop extra arguments from call sites
5694	static void replaceUsesOfNonProtoConstant(llvm::Constant *old,
5695	llvm::Function *newFn) {
5696	// Fast path.
5697	if (old->use_empty()) return;
5698
5699	llvm::Type *newRetTy = newFn->getReturnType();
5700	SmallVector<llvm::Value*, 4> newArgs;
5701
5702	for (llvm::Value::use_iterator ui = old->use_begin(), ue = old->use_end();
5703	ui != ue; ) {
5704	llvm::Value::use_iterator use = ui++; // Increment before the use is erased.
5705	llvm::User *user = use->getUser();
5706
5707	// Recognize and replace uses of bitcasts. Most calls to
5708	// unprototyped functions will use bitcasts.
5709	if (auto *bitcast = dyn_cast<llvm::ConstantExpr>(Val: user)) {
5710	if (bitcast->getOpcode() == llvm::Instruction::BitCast)
5711	replaceUsesOfNonProtoConstant(old: bitcast, newFn);
5712	continue;
5713	}
5714
5715	// Recognize calls to the function.
5716	llvm::CallBase *callSite = dyn_cast<llvm::CallBase>(Val: user);
5717	if (!callSite) continue;
5718	if (!callSite->isCallee(U: &*use))
5719	continue;
5720
5721	// If the return types don't match exactly, then we can't
5722	// transform this call unless it's dead.
5723	if (callSite->getType() != newRetTy && !callSite->use_empty())
5724	continue;
5725
5726	// Get the call site's attribute list.
5727	SmallVector<llvm::AttributeSet, 8> newArgAttrs;
5728	llvm::AttributeList oldAttrs = callSite->getAttributes();
5729
5730	// If the function was passed too few arguments, don't transform.
5731	unsigned newNumArgs = newFn->arg_size();
5732	if (callSite->arg_size() < newNumArgs)
5733	continue;
5734
5735	// If extra arguments were passed, we silently drop them.
5736	// If any of the types mismatch, we don't transform.
5737	unsigned argNo = 0;
5738	bool dontTransform = false;
5739	for (llvm::Argument &A : newFn->args()) {
5740	if (callSite->getArgOperand(i: argNo)->getType() != A.getType()) {
5741	dontTransform = true;
5742	break;
5743	}
5744
5745	// Add any parameter attributes.
5746	newArgAttrs.push_back(Elt: oldAttrs.getParamAttrs(ArgNo: argNo));
5747	argNo++;
5748	}
5749	if (dontTransform)
5750	continue;
5751
5752	// Okay, we can transform this. Create the new call instruction and copy
5753	// over the required information.
5754	newArgs.append(in_start: callSite->arg_begin(), in_end: callSite->arg_begin() + argNo);
5755
5756	// Copy over any operand bundles.
5757	SmallVector<llvm::OperandBundleDef, 1> newBundles;
5758	callSite->getOperandBundlesAsDefs(Defs&: newBundles);
5759
5760	llvm::CallBase *newCall;
5761	if (isa<llvm::CallInst>(Val: callSite)) {
5762	newCall =
5763	llvm::CallInst::Create(Func: newFn, Args: newArgs, Bundles: newBundles, NameStr: "", InsertBefore: callSite);
5764	} else {
5765	auto *oldInvoke = cast<llvm::InvokeInst>(Val: callSite);
5766	newCall = llvm::InvokeInst::Create(Func: newFn, IfNormal: oldInvoke->getNormalDest(),
5767	IfException: oldInvoke->getUnwindDest(), Args: newArgs,
5768	Bundles: newBundles, NameStr: "", InsertBefore: callSite);
5769	}
5770	newArgs.clear(); // for the next iteration
5771
5772	if (!newCall->getType()->isVoidTy())
5773	newCall->takeName(V: callSite);
5774	newCall->setAttributes(
5775	llvm::AttributeList::get(C&: newFn->getContext(), FnAttrs: oldAttrs.getFnAttrs(),
5776	RetAttrs: oldAttrs.getRetAttrs(), ArgAttrs: newArgAttrs));
5777	newCall->setCallingConv(callSite->getCallingConv());
5778
5779	// Finally, remove the old call, replacing any uses with the new one.
5780	if (!callSite->use_empty())
5781	callSite->replaceAllUsesWith(V: newCall);
5782
5783	// Copy debug location attached to CI.
5784	if (callSite->getDebugLoc())
5785	newCall->setDebugLoc(callSite->getDebugLoc());
5786
5787	callSite->eraseFromParent();
5788	}
5789	}
5790
5791	/// ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we
5792	/// implement a function with no prototype, e.g. "int foo() {}". If there are
5793	/// existing call uses of the old function in the module, this adjusts them to
5794	/// call the new function directly.
5795	///
5796	/// This is not just a cleanup: the always_inline pass requires direct calls to
5797	/// functions to be able to inline them. If there is a bitcast in the way, it
5798	/// won't inline them. Instcombine normally deletes these calls, but it isn't
5799	/// run at -O0.
5800	static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old,
5801	llvm::Function *NewFn) {
5802	// If we're redefining a global as a function, don't transform it.
5803	if (!isa<llvm::Function>(Val: Old)) return;
5804
5805	replaceUsesOfNonProtoConstant(old: Old, newFn: NewFn);
5806	}
5807
5808	void CodeGenModule::HandleCXXStaticMemberVarInstantiation(VarDecl *VD) {
5809	auto DK = VD->isThisDeclarationADefinition();
5810	if (DK == VarDecl::Definition && VD->hasAttr<DLLImportAttr>())
5811	return;
5812
5813	TemplateSpecializationKind TSK = VD->getTemplateSpecializationKind();
5814	// If we have a definition, this might be a deferred decl. If the
5815	// instantiation is explicit, make sure we emit it at the end.
5816	if (VD->getDefinition() && TSK == TSK_ExplicitInstantiationDefinition)
5817	GetAddrOfGlobalVar(D: VD);
5818
5819	EmitTopLevelDecl(VD);
5820	}
5821
5822	void CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD,
5823	llvm::GlobalValue *GV) {
5824	const auto *D = cast<FunctionDecl>(Val: GD.getDecl());
5825
5826	// Compute the function info and LLVM type.
5827	const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
5828	llvm::FunctionType *Ty = getTypes().GetFunctionType(Info: FI);
5829
5830	// Get or create the prototype for the function.
5831	if (!GV || (GV->getValueType() != Ty))
5832	GV = cast<llvm::GlobalValue>(Val: GetAddrOfFunction(GD, Ty, /*ForVTable=*/false,
5833	/*DontDefer=*/true,
5834	IsForDefinition: ForDefinition));
5835
5836	// Already emitted.
5837	if (!GV->isDeclaration())
5838	return;
5839
5840	// We need to set linkage and visibility on the function before
5841	// generating code for it because various parts of IR generation
5842	// want to propagate this information down (e.g. to local static
5843	// declarations).
5844	auto *Fn = cast<llvm::Function>(Val: GV);
5845	setFunctionLinkage(GD, F: Fn);
5846
5847	// FIXME: this is redundant with part of setFunctionDefinitionAttributes
5848	setGVProperties(GV: Fn, GD);
5849
5850	MaybeHandleStaticInExternC(D, GV: Fn);
5851
5852	maybeSetTrivialComdat(*D, *Fn);
5853
5854	CodeGenFunction(*this).GenerateCode(GD, Fn, FnInfo: FI);
5855
5856	setNonAliasAttributes(GD, GO: Fn);
5857	SetLLVMFunctionAttributesForDefinition(D, Fn);
5858
5859	if (const ConstructorAttr *CA = D->getAttr<ConstructorAttr>())
5860	AddGlobalCtor(Ctor: Fn, Priority: CA->getPriority());
5861	if (const DestructorAttr *DA = D->getAttr<DestructorAttr>())
5862	AddGlobalDtor(Dtor: Fn, Priority: DA->getPriority(), IsDtorAttrFunc: true);
5863	if (getLangOpts().OpenMP && D->hasAttr<OMPDeclareTargetDeclAttr>())
5864	getOpenMPRuntime().emitDeclareTargetFunction(FD: D, GV);
5865	}
5866
5867	void CodeGenModule::EmitAliasDefinition(GlobalDecl GD) {
5868	const auto *D = cast<ValueDecl>(Val: GD.getDecl());
5869	const AliasAttr *AA = D->getAttr<AliasAttr>();
5870	assert(AA && "Not an alias?");
5871
5872	StringRef MangledName = getMangledName(GD);
5873
5874	if (AA->getAliasee() == MangledName) {
5875	Diags.Report(AA->getLocation(), diag::err_cyclic_alias) << 0;
5876	return;
5877	}
5878
5879	// If there is a definition in the module, then it wins over the alias.
5880	// This is dubious, but allow it to be safe. Just ignore the alias.
5881	llvm::GlobalValue *Entry = GetGlobalValue(Name: MangledName);
5882	if (Entry && !Entry->isDeclaration())
5883	return;
5884
5885	Aliases.push_back(x: GD);
5886
5887	llvm::Type *DeclTy = getTypes().ConvertTypeForMem(T: D->getType());
5888
5889	// Create a reference to the named value. This ensures that it is emitted
5890	// if a deferred decl.
5891	llvm::Constant *Aliasee;
5892	llvm::GlobalValue::LinkageTypes LT;
5893	if (isa<llvm::FunctionType>(Val: DeclTy)) {
5894	Aliasee = GetOrCreateLLVMFunction(MangledName: AA->getAliasee(), Ty: DeclTy, GD,
5895	/*ForVTable=*/false);
5896	LT = getFunctionLinkage(GD);
5897	} else {
5898	Aliasee = GetOrCreateLLVMGlobal(MangledName: AA->getAliasee(), Ty: DeclTy, AddrSpace: LangAS::Default,
5899	/*D=*/nullptr);
5900	if (const auto *VD = dyn_cast<VarDecl>(Val: GD.getDecl()))
5901	LT = getLLVMLinkageVarDefinition(VD);
5902	else
5903	LT = getFunctionLinkage(GD);
5904	}
5905
5906	// Create the new alias itself, but don't set a name yet.
5907	unsigned AS = Aliasee->getType()->getPointerAddressSpace();
5908	auto *GA =
5909	llvm::GlobalAlias::create(Ty: DeclTy, AddressSpace: AS, Linkage: LT, Name: "", Aliasee, Parent: &getModule());
5910
5911	if (Entry) {
5912	if (GA->getAliasee() == Entry) {
5913	Diags.Report(AA->getLocation(), diag::err_cyclic_alias) << 0;
5914	return;
5915	}
5916
5917	assert(Entry->isDeclaration());
5918
5919	// If there is a declaration in the module, then we had an extern followed
5920	// by the alias, as in:
5921	// extern int test6();
5922	// ...
5923	// int test6() __attribute__((alias("test7")));
5924	//
5925	// Remove it and replace uses of it with the alias.
5926	GA->takeName(V: Entry);
5927
5928	Entry->replaceAllUsesWith(V: GA);
5929	Entry->eraseFromParent();
5930	} else {
5931	GA->setName(MangledName);
5932	}
5933
5934	// Set attributes which are particular to an alias; this is a
5935	// specialization of the attributes which may be set on a global
5936	// variable/function.
5937	if (D->hasAttr<WeakAttr>() || D->hasAttr<WeakRefAttr>() ||
5938	D->isWeakImported()) {
5939	GA->setLinkage(llvm::Function::WeakAnyLinkage);
5940	}
5941
5942	if (const auto *VD = dyn_cast<VarDecl>(Val: D))
5943	if (VD->getTLSKind())
5944	setTLSMode(GV: GA, D: *VD);
5945
5946	SetCommonAttributes(GD, GV: GA);
5947
5948	// Emit global alias debug information.
5949	if (isa<VarDecl>(Val: D))
5950	if (CGDebugInfo *DI = getModuleDebugInfo())
5951	DI->EmitGlobalAlias(GV: cast<llvm::GlobalValue>(Val: GA->getAliasee()->stripPointerCasts()), Decl: GD);
5952	}
5953
5954	void CodeGenModule::emitIFuncDefinition(GlobalDecl GD) {
5955	const auto *D = cast<ValueDecl>(Val: GD.getDecl());
5956	const IFuncAttr *IFA = D->getAttr<IFuncAttr>();
5957	assert(IFA && "Not an ifunc?");
5958
5959	StringRef MangledName = getMangledName(GD);
5960
5961	if (IFA->getResolver() == MangledName) {
5962	Diags.Report(IFA->getLocation(), diag::err_cyclic_alias) << 1;
5963	return;
5964	}
5965
5966	// Report an error if some definition overrides ifunc.
5967	llvm::GlobalValue *Entry = GetGlobalValue(Name: MangledName);
5968	if (Entry && !Entry->isDeclaration()) {
5969	GlobalDecl OtherGD;
5970	if (lookupRepresentativeDecl(MangledName, Result&: OtherGD) &&
5971	DiagnosedConflictingDefinitions.insert(V: GD).second) {
5972	Diags.Report(D->getLocation(), diag::err_duplicate_mangled_name)
5973	<< MangledName;
5974	Diags.Report(OtherGD.getDecl()->getLocation(),
5975	diag::note_previous_definition);
5976	}
5977	return;
5978	}
5979
5980	Aliases.push_back(x: GD);
5981
5982	llvm::Type *DeclTy = getTypes().ConvertTypeForMem(T: D->getType());
5983	llvm::Type *ResolverTy = llvm::GlobalIFunc::getResolverFunctionType(IFuncValTy: DeclTy);
5984	llvm::Constant *Resolver =
5985	GetOrCreateLLVMFunction(MangledName: IFA->getResolver(), Ty: ResolverTy, GD: {},
5986	/*ForVTable=*/false);
5987	llvm::GlobalIFunc *GIF =
5988	llvm::GlobalIFunc::create(Ty: DeclTy, AddressSpace: 0, Linkage: llvm::Function::ExternalLinkage,
5989	Name: "", Resolver, Parent: &getModule());
5990	if (Entry) {
5991	if (GIF->getResolver() == Entry) {
5992	Diags.Report(IFA->getLocation(), diag::err_cyclic_alias) << 1;
5993	return;
5994	}
5995	assert(Entry->isDeclaration());
5996
5997	// If there is a declaration in the module, then we had an extern followed
5998	// by the ifunc, as in:
5999	// extern int test();
6000	// ...
6001	// int test() __attribute__((ifunc("resolver")));
6002	//
6003	// Remove it and replace uses of it with the ifunc.
6004	GIF->takeName(V: Entry);
6005
6006	Entry->replaceAllUsesWith(V: GIF);
6007	Entry->eraseFromParent();
6008	} else
6009	GIF->setName(MangledName);
6010	if (auto *F = dyn_cast<llvm::Function>(Resolver)) {
6011	F->addFnAttr(llvm::Attribute::DisableSanitizerInstrumentation);
6012	}
6013	SetCommonAttributes(GD, GV: GIF);
6014	}
6015
6016	llvm::Function *CodeGenModule::getIntrinsic(unsigned IID,
6017	ArrayRef<llvm::Type*> Tys) {
6018	return llvm::Intrinsic::getDeclaration(M: &getModule(), id: (llvm::Intrinsic::ID)IID,
6019	Tys);
6020	}
6021
6022	static llvm::StringMapEntry<llvm::GlobalVariable *> &
6023	GetConstantCFStringEntry(llvm::StringMap<llvm::GlobalVariable *> &Map,
6024	const StringLiteral *Literal, bool TargetIsLSB,
6025	bool &IsUTF16, unsigned &StringLength) {
6026	StringRef String = Literal->getString();
6027	unsigned NumBytes = String.size();
6028
6029	// Check for simple case.
6030	if (!Literal->containsNonAsciiOrNull()) {
6031	StringLength = NumBytes;
6032	return *Map.insert(KV: std::make_pair(x&: String, y: nullptr)).first;
6033	}
6034
6035	// Otherwise, convert the UTF8 literals into a string of shorts.
6036	IsUTF16 = true;
6037
6038	SmallVector<llvm::UTF16, 128> ToBuf(NumBytes + 1); // +1 for ending nulls.
6039	const llvm::UTF8 *FromPtr = (const llvm::UTF8 *)String.data();
6040	llvm::UTF16 *ToPtr = &ToBuf[0];
6041
6042	(void)llvm::ConvertUTF8toUTF16(sourceStart: &FromPtr, sourceEnd: FromPtr + NumBytes, targetStart: &ToPtr,
6043	targetEnd: ToPtr + NumBytes, flags: llvm::strictConversion);
6044
6045	// ConvertUTF8toUTF16 returns the length in ToPtr.
6046	StringLength = ToPtr - &ToBuf[0];
6047
6048	// Add an explicit null.
6049	*ToPtr = 0;
6050	return *Map.insert(KV: std::make_pair(
6051	x: StringRef(reinterpret_cast<const char *>(ToBuf.data()),
6052	(StringLength + 1) * 2),
6053	y: nullptr)).first;
6054	}
6055
6056	ConstantAddress
6057	CodeGenModule::GetAddrOfConstantCFString(const StringLiteral *Literal) {
6058	unsigned StringLength = 0;
6059	bool isUTF16 = false;
6060	llvm::StringMapEntry<llvm::GlobalVariable *> &Entry =
6061	GetConstantCFStringEntry(Map&: CFConstantStringMap, Literal,
6062	TargetIsLSB: getDataLayout().isLittleEndian(), IsUTF16&: isUTF16,
6063	StringLength);
6064
6065	if (auto *C = Entry.second)
6066	return ConstantAddress(
6067	C, C->getValueType(), CharUnits::fromQuantity(Quantity: C->getAlignment()));
6068
6069	llvm::Constant *Zero = llvm::Constant::getNullValue(Ty: Int32Ty);
6070	llvm::Constant *Zeros[] = { Zero, Zero };
6071
6072	const ASTContext &Context = getContext();
6073	const llvm::Triple &Triple = getTriple();
6074
6075	const auto CFRuntime = getLangOpts().CFRuntime;
6076	const bool IsSwiftABI =
6077	static_cast<unsigned>(CFRuntime) >=
6078	static_cast<unsigned>(LangOptions::CoreFoundationABI::Swift);
6079	const bool IsSwift4_1 = CFRuntime == LangOptions::CoreFoundationABI::Swift4_1;
6080
6081	// If we don't already have it, get __CFConstantStringClassReference.
6082	if (!CFConstantStringClassRef) {
6083	const char *CFConstantStringClassName = "__CFConstantStringClassReference";
6084	llvm::Type *Ty = getTypes().ConvertType(T: getContext().IntTy);
6085	Ty = llvm::ArrayType::get(ElementType: Ty, NumElements: 0);
6086
6087	switch (CFRuntime) {
6088	default: break;
6089	case LangOptions::CoreFoundationABI::Swift: [[fallthrough]];
6090	case LangOptions::CoreFoundationABI::Swift5_0:
6091	CFConstantStringClassName =
6092	Triple.isOSDarwin() ? "$s15SwiftFoundation19_NSCFConstantStringCN"
6093	: "$s10Foundation19_NSCFConstantStringCN";
6094	Ty = IntPtrTy;
6095	break;
6096	case LangOptions::CoreFoundationABI::Swift4_2:
6097	CFConstantStringClassName =
6098	Triple.isOSDarwin() ? "$S15SwiftFoundation19_NSCFConstantStringCN"
6099	: "$S10Foundation19_NSCFConstantStringCN";
6100	Ty = IntPtrTy;
6101	break;
6102	case LangOptions::CoreFoundationABI::Swift4_1:
6103	CFConstantStringClassName =
6104	Triple.isOSDarwin() ? "__T015SwiftFoundation19_NSCFConstantStringCN"
6105	: "__T010Foundation19_NSCFConstantStringCN";
6106	Ty = IntPtrTy;
6107	break;
6108	}
6109
6110	llvm::Constant *C = CreateRuntimeVariable(Ty, Name: CFConstantStringClassName);
6111
6112	if (Triple.isOSBinFormatELF() || Triple.isOSBinFormatCOFF()) {
6113	llvm::GlobalValue *GV = nullptr;
6114
6115	if ((GV = dyn_cast<llvm::GlobalValue>(Val: C))) {
6116	IdentifierInfo &II = Context.Idents.get(Name: GV->getName());
6117	TranslationUnitDecl *TUDecl = Context.getTranslationUnitDecl();
6118	DeclContext *DC = TranslationUnitDecl::castToDeclContext(D: TUDecl);
6119
6120	const VarDecl *VD = nullptr;
6121	for (const auto *Result : DC->lookup(Name: &II))
6122	if ((VD = dyn_cast<VarDecl>(Val: Result)))
6123	break;
6124
6125	if (Triple.isOSBinFormatELF()) {
6126	if (!VD)
6127	GV->setLinkage(llvm::GlobalValue::ExternalLinkage);
6128	} else {
6129	GV->setLinkage(llvm::GlobalValue::ExternalLinkage);
6130	if (!VD || !VD->hasAttr<DLLExportAttr>())
6131	GV->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
6132	else
6133	GV->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
6134	}
6135
6136	setDSOLocal(GV);
6137	}
6138	}
6139
6140	// Decay array -> ptr
6141	CFConstantStringClassRef =
6142	IsSwiftABI ? llvm::ConstantExpr::getPtrToInt(C, Ty)
6143	: llvm::ConstantExpr::getGetElementPtr(Ty, C, IdxList: Zeros);
6144	}
6145
6146	QualType CFTy = Context.getCFConstantStringType();
6147
6148	auto *STy = cast<llvm::StructType>(Val: getTypes().ConvertType(T: CFTy));
6149
6150	ConstantInitBuilder Builder(*this);
6151	auto Fields = Builder.beginStruct(structTy: STy);
6152
6153	// Class pointer.
6154	Fields.add(value: cast<llvm::Constant>(Val&: CFConstantStringClassRef));
6155
6156	// Flags.
6157	if (IsSwiftABI) {
6158	Fields.addInt(intTy: IntPtrTy, value: IsSwift4_1 ? 0x05 : 0x01);
6159	Fields.addInt(intTy: Int64Ty, value: isUTF16 ? 0x07d0 : 0x07c8);
6160	} else {
6161	Fields.addInt(intTy: IntTy, value: isUTF16 ? 0x07d0 : 0x07C8);
6162	}
6163
6164	// String pointer.
6165	llvm::Constant *C = nullptr;
6166	if (isUTF16) {
6167	auto Arr = llvm::ArrayRef(
6168	reinterpret_cast<uint16_t *>(const_cast<char *>(Entry.first().data())),
6169	Entry.first().size() / 2);
6170	C = llvm::ConstantDataArray::get(Context&: VMContext, Elts: Arr);
6171	} else {
6172	C = llvm::ConstantDataArray::getString(Context&: VMContext, Initializer: Entry.first());
6173	}
6174
6175	// Note: -fwritable-strings doesn't make the backing store strings of
6176	// CFStrings writable.
6177	auto *GV =
6178	new llvm::GlobalVariable(getModule(), C->getType(), /*isConstant=*/true,
6179	llvm::GlobalValue::PrivateLinkage, C, ".str");
6180	GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
6181	// Don't enforce the target's minimum global alignment, since the only use
6182	// of the string is via this class initializer.
6183	CharUnits Align = isUTF16 ? Context.getTypeAlignInChars(Context.ShortTy)
6184	: Context.getTypeAlignInChars(Context.CharTy);
6185	GV->setAlignment(Align.getAsAlign());
6186
6187	// FIXME: We set the section explicitly to avoid a bug in ld64 224.1.
6188	// Without it LLVM can merge the string with a non unnamed_addr one during
6189	// LTO. Doing that changes the section it ends in, which surprises ld64.
6190	if (Triple.isOSBinFormatMachO())
6191	GV->setSection(isUTF16 ? "__TEXT,__ustring"
6192	: "__TEXT,__cstring,cstring_literals");
6193	// Make sure the literal ends up in .rodata to allow for safe ICF and for
6194	// the static linker to adjust permissions to read-only later on.
6195	else if (Triple.isOSBinFormatELF())
6196	GV->setSection(".rodata");
6197
6198	// String.
6199	llvm::Constant *Str =
6200	llvm::ConstantExpr::getGetElementPtr(Ty: GV->getValueType(), C: GV, IdxList: Zeros);
6201
6202	Fields.add(value: Str);
6203
6204	// String length.
6205	llvm::IntegerType *LengthTy =
6206	llvm::IntegerType::get(C&: getModule().getContext(),
6207	NumBits: Context.getTargetInfo().getLongWidth());
6208	if (IsSwiftABI) {
6209	if (CFRuntime == LangOptions::CoreFoundationABI::Swift4_1 ||
6210	CFRuntime == LangOptions::CoreFoundationABI::Swift4_2)
6211	LengthTy = Int32Ty;
6212	else
6213	LengthTy = IntPtrTy;
6214	}
6215	Fields.addInt(intTy: LengthTy, value: StringLength);
6216
6217	// Swift ABI requires 8-byte alignment to ensure that the _Atomic(uint64_t) is
6218	// properly aligned on 32-bit platforms.
6219	CharUnits Alignment =
6220	IsSwiftABI ? Context.toCharUnitsFromBits(BitSize: 64) : getPointerAlign();
6221
6222	// The struct.
6223	GV = Fields.finishAndCreateGlobal(args: "_unnamed_cfstring_", args&: Alignment,
6224	/*isConstant=*/args: false,
6225	args: llvm::GlobalVariable::PrivateLinkage);
6226	GV->addAttribute(Kind: "objc_arc_inert");
6227	switch (Triple.getObjectFormat()) {
6228	case llvm::Triple::UnknownObjectFormat:
6229	llvm_unreachable("unknown file format");
6230	case llvm::Triple::DXContainer:
6231	case llvm::Triple::GOFF:
6232	case llvm::Triple::SPIRV:
6233	case llvm::Triple::XCOFF:
6234	llvm_unreachable("unimplemented");
6235	case llvm::Triple::COFF:
6236	case llvm::Triple::ELF:
6237	case llvm::Triple::Wasm:
6238	GV->setSection("cfstring");
6239	break;
6240	case llvm::Triple::MachO:
6241	GV->setSection("__DATA,__cfstring");
6242	break;
6243	}
6244	Entry.second = GV;
6245
6246	return ConstantAddress(GV, GV->getValueType(), Alignment);
6247	}
6248
6249	bool CodeGenModule::getExpressionLocationsEnabled() const {
6250	return !CodeGenOpts.EmitCodeView || CodeGenOpts.DebugColumnInfo;
6251	}
6252
6253	QualType CodeGenModule::getObjCFastEnumerationStateType() {
6254	if (ObjCFastEnumerationStateType.isNull()) {
6255	RecordDecl *D = Context.buildImplicitRecord(Name: "__objcFastEnumerationState");
6256	D->startDefinition();
6257
6258	QualType FieldTypes[] = {
6259	Context.UnsignedLongTy, Context.getPointerType(T: Context.getObjCIdType()),
6260	Context.getPointerType(Context.UnsignedLongTy),
6261	Context.getConstantArrayType(EltTy: Context.UnsignedLongTy, ArySize: llvm::APInt(32, 5),
6262	SizeExpr: nullptr, ASM: ArraySizeModifier::Normal, IndexTypeQuals: 0)};
6263
6264	for (size_t i = 0; i < 4; ++i) {
6265	FieldDecl *Field = FieldDecl::Create(C: Context,
6266	DC: D,
6267	StartLoc: SourceLocation(),
6268	IdLoc: SourceLocation(), Id: nullptr,
6269	T: FieldTypes[i], /*TInfo=*/nullptr,
6270	/*BitWidth=*/BW: nullptr,
6271	/*Mutable=*/false,
6272	InitStyle: ICIS_NoInit);
6273	Field->setAccess(AS_public);
6274	D->addDecl(Field);
6275	}
6276
6277	D->completeDefinition();
6278	ObjCFastEnumerationStateType = Context.getTagDeclType(D);
6279	}
6280
6281	return ObjCFastEnumerationStateType;
6282	}
6283
6284	llvm::Constant *
6285	CodeGenModule::GetConstantArrayFromStringLiteral(const StringLiteral *E) {
6286	assert(!E->getType()->isPointerType() && "Strings are always arrays");
6287
6288	// Don't emit it as the address of the string, emit the string data itself
6289	// as an inline array.
6290	if (E->getCharByteWidth() == 1) {
6291	SmallString<64> Str(E->getString());
6292
6293	// Resize the string to the right size, which is indicated by its type.
6294	const ConstantArrayType *CAT = Context.getAsConstantArrayType(T: E->getType());
6295	assert(CAT && "String literal not of constant array type!");
6296	Str.resize(N: CAT->getSize().getZExtValue());
6297	return llvm::ConstantDataArray::getString(Context&: VMContext, Initializer: Str, AddNull: false);
6298	}
6299
6300	auto *AType = cast<llvm::ArrayType>(getTypes().ConvertType(T: E->getType()));
6301	llvm::Type *ElemTy = AType->getElementType();
6302	unsigned NumElements = AType->getNumElements();
6303
6304	// Wide strings have either 2-byte or 4-byte elements.
6305	if (ElemTy->getPrimitiveSizeInBits() == 16) {
6306	SmallVector<uint16_t, 32> Elements;
6307	Elements.reserve(N: NumElements);
6308
6309	for(unsigned i = 0, e = E->getLength(); i != e; ++i)
6310	Elements.push_back(Elt: E->getCodeUnit(i));
6311	Elements.resize(N: NumElements);
6312	return llvm::ConstantDataArray::get(Context&: VMContext, Elts&: Elements);
6313	}
6314
6315	assert(ElemTy->getPrimitiveSizeInBits() == 32);
6316	SmallVector<uint32_t, 32> Elements;
6317	Elements.reserve(N: NumElements);
6318
6319	for(unsigned i = 0, e = E->getLength(); i != e; ++i)
6320	Elements.push_back(Elt: E->getCodeUnit(i));
6321	Elements.resize(N: NumElements);
6322	return llvm::ConstantDataArray::get(Context&: VMContext, Elts&: Elements);
6323	}
6324
6325	static llvm::GlobalVariable *
6326	GenerateStringLiteral(llvm::Constant *C, llvm::GlobalValue::LinkageTypes LT,
6327	CodeGenModule &CGM, StringRef GlobalName,
6328	CharUnits Alignment) {
6329	unsigned AddrSpace = CGM.getContext().getTargetAddressSpace(
6330	AS: CGM.GetGlobalConstantAddressSpace());
6331
6332	llvm::Module &M = CGM.getModule();
6333	// Create a global variable for this string
6334	auto *GV = new llvm::GlobalVariable(
6335	M, C->getType(), !CGM.getLangOpts().WritableStrings, LT, C, GlobalName,
6336	nullptr, llvm::GlobalVariable::NotThreadLocal, AddrSpace);
6337	GV->setAlignment(Alignment.getAsAlign());
6338	GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
6339	if (GV->isWeakForLinker()) {
6340	assert(CGM.supportsCOMDAT() && "Only COFF uses weak string literals");
6341	GV->setComdat(M.getOrInsertComdat(Name: GV->getName()));
6342	}
6343	CGM.setDSOLocal(GV);
6344
6345	return GV;
6346	}
6347
6348	/// GetAddrOfConstantStringFromLiteral - Return a pointer to a
6349	/// constant array for the given string literal.
6350	ConstantAddress
6351	CodeGenModule::GetAddrOfConstantStringFromLiteral(const StringLiteral *S,
6352	StringRef Name) {
6353	CharUnits Alignment =
6354	getContext().getAlignOfGlobalVarInChars(T: S->getType(), /*VD=*/nullptr);
6355
6356	llvm::Constant *C = GetConstantArrayFromStringLiteral(E: S);
6357	llvm::GlobalVariable **Entry = nullptr;
6358	if (!LangOpts.WritableStrings) {
6359	Entry = &ConstantStringMap[C];
6360	if (auto GV = *Entry) {
6361	if (uint64_t(Alignment.getQuantity()) > GV->getAlignment())
6362	GV->setAlignment(Alignment.getAsAlign());
6363	return ConstantAddress(castStringLiteralToDefaultAddressSpace(CGM&: *this, GV),
6364	GV->getValueType(), Alignment);
6365	}
6366	}
6367
6368	SmallString<256> MangledNameBuffer;
6369	StringRef GlobalVariableName;
6370	llvm::GlobalValue::LinkageTypes LT;
6371
6372	// Mangle the string literal if that's how the ABI merges duplicate strings.
6373	// Don't do it if they are writable, since we don't want writes in one TU to
6374	// affect strings in another.
6375	if (getCXXABI().getMangleContext().shouldMangleStringLiteral(SL: S) &&
6376	!LangOpts.WritableStrings) {
6377	llvm::raw_svector_ostream Out(MangledNameBuffer);
6378	getCXXABI().getMangleContext().mangleStringLiteral(SL: S, Out);
6379	LT = llvm::GlobalValue::LinkOnceODRLinkage;
6380	GlobalVariableName = MangledNameBuffer;
6381	} else {
6382	LT = llvm::GlobalValue::PrivateLinkage;
6383	GlobalVariableName = Name;
6384	}
6385
6386	auto GV = GenerateStringLiteral(C, LT, CGM&: *this, GlobalName: GlobalVariableName, Alignment);
6387
6388	CGDebugInfo *DI = getModuleDebugInfo();
6389	if (DI && getCodeGenOpts().hasReducedDebugInfo())
6390	DI->AddStringLiteralDebugInfo(GV: GV, S);
6391
6392	if (Entry)
6393	*Entry = GV;
6394
6395	SanitizerMD->reportGlobal(GV, S->getStrTokenLoc(TokNum: 0), "<string literal>");
6396
6397	return ConstantAddress(castStringLiteralToDefaultAddressSpace(*this, GV),
6398	GV->getValueType(), Alignment);
6399	}
6400
6401	/// GetAddrOfConstantStringFromObjCEncode - Return a pointer to a constant
6402	/// array for the given ObjCEncodeExpr node.
6403	ConstantAddress
6404	CodeGenModule::GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *E) {
6405	std::string Str;
6406	getContext().getObjCEncodingForType(T: E->getEncodedType(), S&: Str);
6407
6408	return GetAddrOfConstantCString(Str);
6409	}
6410
6411	/// GetAddrOfConstantCString - Returns a pointer to a character array containing
6412	/// the literal and a terminating '\0' character.
6413	/// The result has pointer to array type.
6414	ConstantAddress CodeGenModule::GetAddrOfConstantCString(
6415	const std::string &Str, const char *GlobalName) {
6416	StringRef StrWithNull(Str.c_str(), Str.size() + 1);
6417	CharUnits Alignment = getContext().getAlignOfGlobalVarInChars(
6418	T: getContext().CharTy, /*VD=*/nullptr);
6419
6420	llvm::Constant *C =
6421	llvm::ConstantDataArray::getString(Context&: getLLVMContext(), Initializer: StrWithNull, AddNull: false);
6422
6423	// Don't share any string literals if strings aren't constant.
6424	llvm::GlobalVariable **Entry = nullptr;
6425	if (!LangOpts.WritableStrings) {
6426	Entry = &ConstantStringMap[C];
6427	if (auto GV = *Entry) {
6428	if (uint64_t(Alignment.getQuantity()) > GV->getAlignment())
6429	GV->setAlignment(Alignment.getAsAlign());
6430	return ConstantAddress(castStringLiteralToDefaultAddressSpace(CGM&: *this, GV),
6431	GV->getValueType(), Alignment);
6432	}
6433	}
6434
6435	// Get the default prefix if a name wasn't specified.
6436	if (!GlobalName)
6437	GlobalName = ".str";
6438	// Create a global variable for this.
6439	auto GV = GenerateStringLiteral(C, LT: llvm::GlobalValue::PrivateLinkage, CGM&: *this,
6440	GlobalName, Alignment);
6441	if (Entry)
6442	*Entry = GV;
6443
6444	return ConstantAddress(castStringLiteralToDefaultAddressSpace(*this, GV),
6445	GV->getValueType(), Alignment);
6446	}
6447
6448	ConstantAddress CodeGenModule::GetAddrOfGlobalTemporary(
6449	const MaterializeTemporaryExpr *E, const Expr *Init) {
6450	assert((E->getStorageDuration() == SD_Static ||
6451	E->getStorageDuration() == SD_Thread) && "not a global temporary");
6452	const auto *VD = cast<VarDecl>(Val: E->getExtendingDecl());
6453
6454	// If we're not materializing a subobject of the temporary, keep the
6455	// cv-qualifiers from the type of the MaterializeTemporaryExpr.
6456	QualType MaterializedType = Init->getType();
6457	if (Init == E->getSubExpr())
6458	MaterializedType = E->getType();
6459
6460	CharUnits Align = getContext().getTypeAlignInChars(T: MaterializedType);
6461
6462	auto InsertResult = MaterializedGlobalTemporaryMap.insert({E, nullptr});
6463	if (!InsertResult.second) {
6464	// We've seen this before: either we already created it or we're in the
6465	// process of doing so.
6466	if (!InsertResult.first->second) {
6467	// We recursively re-entered this function, probably during emission of
6468	// the initializer. Create a placeholder. We'll clean this up in the
6469	// outer call, at the end of this function.
6470	llvm::Type *Type = getTypes().ConvertTypeForMem(T: MaterializedType);
6471	InsertResult.first->second = new llvm::GlobalVariable(
6472	getModule(), Type, false, llvm::GlobalVariable::InternalLinkage,
6473	nullptr);
6474	}
6475	return ConstantAddress(InsertResult.first->second,
6476	llvm::cast<llvm::GlobalVariable>(
6477	InsertResult.first->second->stripPointerCasts())
6478	->getValueType(),
6479	Align);
6480	}
6481
6482	// FIXME: If an externally-visible declaration extends multiple temporaries,
6483	// we need to give each temporary the same name in every translation unit (and
6484	// we also need to make the temporaries externally-visible).
6485	SmallString<256> Name;
6486	llvm::raw_svector_ostream Out(Name);
6487	getCXXABI().getMangleContext().mangleReferenceTemporary(
6488	D: VD, ManglingNumber: E->getManglingNumber(), Out);
6489
6490	APValue *Value = nullptr;
6491	if (E->getStorageDuration() == SD_Static && VD->evaluateValue()) {
6492	// If the initializer of the extending declaration is a constant
6493	// initializer, we should have a cached constant initializer for this
6494	// temporary. Note that this might have a different value from the value
6495	// computed by evaluating the initializer if the surrounding constant
6496	// expression modifies the temporary.
6497	Value = E->getOrCreateValue(MayCreate: false);
6498	}
6499
6500	// Try evaluating it now, it might have a constant initializer.
6501	Expr::EvalResult EvalResult;
6502	if (!Value && Init->EvaluateAsRValue(Result&: EvalResult, Ctx: getContext()) &&
6503	!EvalResult.hasSideEffects())
6504	Value = &EvalResult.Val;
6505
6506	LangAS AddrSpace = GetGlobalVarAddressSpace(D: VD);
6507
6508	std::optional<ConstantEmitter> emitter;
6509	llvm::Constant *InitialValue = nullptr;
6510	bool Constant = false;
6511	llvm::Type *Type;
6512	if (Value) {
6513	// The temporary has a constant initializer, use it.
6514	emitter.emplace(args&: *this);
6515	InitialValue = emitter->emitForInitializer(value: *Value, destAddrSpace: AddrSpace,
6516	destType: MaterializedType);
6517	Constant =
6518	MaterializedType.isConstantStorage(Ctx: getContext(), /*ExcludeCtor*/ Value,
6519	/*ExcludeDtor*/ false);
6520	Type = InitialValue->getType();
6521	} else {
6522	// No initializer, the initialization will be provided when we
6523	// initialize the declaration which performed lifetime extension.
6524	Type = getTypes().ConvertTypeForMem(T: MaterializedType);
6525	}
6526
6527	// Create a global variable for this lifetime-extended temporary.
6528	llvm::GlobalValue::LinkageTypes Linkage = getLLVMLinkageVarDefinition(VD);
6529	if (Linkage == llvm::GlobalVariable::ExternalLinkage) {
6530	const VarDecl *InitVD;
6531	if (VD->isStaticDataMember() && VD->getAnyInitializer(D&: InitVD) &&
6532	isa<CXXRecordDecl>(InitVD->getLexicalDeclContext())) {
6533	// Temporaries defined inside a class get linkonce_odr linkage because the
6534	// class can be defined in multiple translation units.
6535	Linkage = llvm::GlobalVariable::LinkOnceODRLinkage;
6536	} else {
6537	// There is no need for this temporary to have external linkage if the
6538	// VarDecl has external linkage.
6539	Linkage = llvm::GlobalVariable::InternalLinkage;
6540	}
6541	}
6542	auto TargetAS = getContext().getTargetAddressSpace(AS: AddrSpace);
6543	auto *GV = new llvm::GlobalVariable(
6544	getModule(), Type, Constant, Linkage, InitialValue, Name.c_str(),
6545	/*InsertBefore=*/nullptr, llvm::GlobalVariable::NotThreadLocal, TargetAS);
6546	if (emitter) emitter->finalize(global: GV);
6547	// Don't assign dllimport or dllexport to local linkage globals.
6548	if (!llvm::GlobalValue::isLocalLinkage(Linkage)) {
6549	setGVProperties(GV, GD: VD);
6550	if (GV->getDLLStorageClass() == llvm::GlobalVariable::DLLExportStorageClass)
6551	// The reference temporary should never be dllexport.
6552	GV->setDLLStorageClass(llvm::GlobalVariable::DefaultStorageClass);
6553	}
6554	GV->setAlignment(Align.getAsAlign());
6555	if (supportsCOMDAT() && GV->isWeakForLinker())
6556	GV->setComdat(TheModule.getOrInsertComdat(Name: GV->getName()));
6557	if (VD->getTLSKind())
6558	setTLSMode(GV, D: *VD);
6559	llvm::Constant *CV = GV;
6560	if (AddrSpace != LangAS::Default)
6561	CV = getTargetCodeGenInfo().performAddrSpaceCast(
6562	CGM&: *this, V: GV, SrcAddr: AddrSpace, DestAddr: LangAS::Default,
6563	DestTy: llvm::PointerType::get(
6564	C&: getLLVMContext(),
6565	AddressSpace: getContext().getTargetAddressSpace(AS: LangAS::Default)));
6566
6567	// Update the map with the new temporary. If we created a placeholder above,
6568	// replace it with the new global now.
6569	llvm::Constant *&Entry = MaterializedGlobalTemporaryMap[E];
6570	if (Entry) {
6571	Entry->replaceAllUsesWith(V: CV);
6572	llvm::cast<llvm::GlobalVariable>(Val: Entry)->eraseFromParent();
6573	}
6574	Entry = CV;
6575
6576	return ConstantAddress(CV, Type, Align);
6577	}
6578
6579	/// EmitObjCPropertyImplementations - Emit information for synthesized
6580	/// properties for an implementation.
6581	void CodeGenModule::EmitObjCPropertyImplementations(const
6582	ObjCImplementationDecl *D) {
6583	for (const auto *PID : D->property_impls()) {
6584	// Dynamic is just for type-checking.
6585	if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) {
6586	ObjCPropertyDecl *PD = PID->getPropertyDecl();
6587
6588	// Determine which methods need to be implemented, some may have
6589	// been overridden. Note that ::isPropertyAccessor is not the method
6590	// we want, that just indicates if the decl came from a
6591	// property. What we want to know is if the method is defined in
6592	// this implementation.
6593	auto *Getter = PID->getGetterMethodDecl();
6594	if (!Getter || Getter->isSynthesizedAccessorStub())
6595	CodeGenFunction(*this).GenerateObjCGetter(
6596	const_cast<ObjCImplementationDecl *>(D), PID);
6597	auto *Setter = PID->getSetterMethodDecl();
6598	if (!PD->isReadOnly() && (!Setter || Setter->isSynthesizedAccessorStub()))
6599	CodeGenFunction(*this).GenerateObjCSetter(
6600	const_cast<ObjCImplementationDecl *>(D), PID);
6601	}
6602	}
6603	}
6604
6605	static bool needsDestructMethod(ObjCImplementationDecl *impl) {
6606	const ObjCInterfaceDecl *iface = impl->getClassInterface();
6607	for (const ObjCIvarDecl *ivar = iface->all_declared_ivar_begin();
6608	ivar; ivar = ivar->getNextIvar())
6609	if (ivar->getType().isDestructedType())
6610	return true;
6611
6612	return false;
6613	}
6614
6615	static bool AllTrivialInitializers(CodeGenModule &CGM,
6616	ObjCImplementationDecl *D) {
6617	CodeGenFunction CGF(CGM);
6618	for (ObjCImplementationDecl::init_iterator B = D->init_begin(),
6619	E = D->init_end(); B != E; ++B) {
6620	CXXCtorInitializer *CtorInitExp = *B;
6621	Expr *Init = CtorInitExp->getInit();
6622	if (!CGF.isTrivialInitializer(Init))
6623	return false;
6624	}
6625	return true;
6626	}
6627
6628	/// EmitObjCIvarInitializations - Emit information for ivar initialization
6629	/// for an implementation.
6630	void CodeGenModule::EmitObjCIvarInitializations(ObjCImplementationDecl *D) {
6631	// We might need a .cxx_destruct even if we don't have any ivar initializers.
6632	if (needsDestructMethod(impl: D)) {
6633	IdentifierInfo *II = &getContext().Idents.get(Name: ".cxx_destruct");
6634	Selector cxxSelector = getContext().Selectors.getSelector(NumArgs: 0, IIV: &II);
6635	ObjCMethodDecl *DTORMethod = ObjCMethodDecl::Create(
6636	C&: getContext(), beginLoc: D->getLocation(), endLoc: D->getLocation(), SelInfo: cxxSelector,
6637	T: getContext().VoidTy, ReturnTInfo: nullptr, contextDecl: D,
6638	/*isInstance=*/true, /*isVariadic=*/false,
6639	/*isPropertyAccessor=*/true, /*isSynthesizedAccessorStub=*/false,
6640	/*isImplicitlyDeclared=*/true,
6641	/*isDefined=*/false, impControl: ObjCImplementationControl::Required);
6642	D->addInstanceMethod(DTORMethod);
6643	CodeGenFunction(*this).GenerateObjCCtorDtorMethod(IMP: D, MD: DTORMethod, ctor: false);
6644	D->setHasDestructors(true);
6645	}
6646
6647	// If the implementation doesn't have any ivar initializers, we don't need
6648	// a .cxx_construct.
6649	if (D->getNumIvarInitializers() == 0 ||
6650	AllTrivialInitializers(CGM&: *this, D))
6651	return;
6652
6653	IdentifierInfo *II = &getContext().Idents.get(Name: ".cxx_construct");
6654	Selector cxxSelector = getContext().Selectors.getSelector(NumArgs: 0, IIV: &II);
6655	// The constructor returns 'self'.
6656	ObjCMethodDecl *CTORMethod = ObjCMethodDecl::Create(
6657	C&: getContext(), beginLoc: D->getLocation(), endLoc: D->getLocation(), SelInfo: cxxSelector,
6658	T: getContext().getObjCIdType(), ReturnTInfo: nullptr, contextDecl: D, /*isInstance=*/true,
6659	/*isVariadic=*/false,
6660	/*isPropertyAccessor=*/true, /*isSynthesizedAccessorStub=*/false,
6661	/*isImplicitlyDeclared=*/true,
6662	/*isDefined=*/false, impControl: ObjCImplementationControl::Required);
6663	D->addInstanceMethod(CTORMethod);
6664	CodeGenFunction(*this).GenerateObjCCtorDtorMethod(IMP: D, MD: CTORMethod, ctor: true);
6665	D->setHasNonZeroConstructors(true);
6666	}
6667
6668	// EmitLinkageSpec - Emit all declarations in a linkage spec.
6669	void CodeGenModule::EmitLinkageSpec(const LinkageSpecDecl *LSD) {
6670	if (LSD->getLanguage() != LinkageSpecLanguageIDs::C &&
6671	LSD->getLanguage() != LinkageSpecLanguageIDs::CXX) {
6672	ErrorUnsupported(LSD, "linkage spec");
6673	return;
6674	}
6675
6676	EmitDeclContext(LSD);
6677	}
6678
6679	void CodeGenModule::EmitTopLevelStmt(const TopLevelStmtDecl *D) {
6680	// Device code should not be at top level.
6681	if (LangOpts.CUDA && LangOpts.CUDAIsDevice)
6682	return;
6683
6684	std::unique_ptr<CodeGenFunction> &CurCGF =
6685	GlobalTopLevelStmtBlockInFlight.first;
6686
6687	// We emitted a top-level stmt but after it there is initialization.
6688	// Stop squashing the top-level stmts into a single function.
6689	if (CurCGF && CXXGlobalInits.back() != CurCGF->CurFn) {
6690	CurCGF->FinishFunction(EndLoc: D->getEndLoc());
6691	CurCGF = nullptr;
6692	}
6693
6694	if (!CurCGF) {
6695	// void __stmts__N(void)
6696	// FIXME: Ask the ABI name mangler to pick a name.
6697	std::string Name = "__stmts__" + llvm::utostr(X: CXXGlobalInits.size());
6698	FunctionArgList Args;
6699	QualType RetTy = getContext().VoidTy;
6700	const CGFunctionInfo &FnInfo =
6701	getTypes().arrangeBuiltinFunctionDeclaration(resultType: RetTy, args: Args);
6702	llvm::FunctionType *FnTy = getTypes().GetFunctionType(Info: FnInfo);
6703	llvm::Function *Fn = llvm::Function::Create(
6704	Ty: FnTy, Linkage: llvm::GlobalValue::InternalLinkage, N: Name, M: &getModule());
6705
6706	CurCGF.reset(p: new CodeGenFunction(*this));
6707	GlobalTopLevelStmtBlockInFlight.second = D;
6708	CurCGF->StartFunction(GD: GlobalDecl(), RetTy, Fn, FnInfo, Args,
6709	Loc: D->getBeginLoc(), StartLoc: D->getBeginLoc());
6710	CXXGlobalInits.push_back(x: Fn);
6711	}
6712
6713	CurCGF->EmitStmt(S: D->getStmt());
6714	}
6715
6716	void CodeGenModule::EmitDeclContext(const DeclContext *DC) {
6717	for (auto *I : DC->decls()) {
6718	// Unlike other DeclContexts, the contents of an ObjCImplDecl at TU scope
6719	// are themselves considered "top-level", so EmitTopLevelDecl on an
6720	// ObjCImplDecl does not recursively visit them. We need to do that in
6721	// case they're nested inside another construct (LinkageSpecDecl /
6722	// ExportDecl) that does stop them from being considered "top-level".
6723	if (auto *OID = dyn_cast<ObjCImplDecl>(Val: I)) {
6724	for (auto *M : OID->methods())
6725	EmitTopLevelDecl(M);
6726	}
6727
6728	EmitTopLevelDecl(D: I);
6729	}
6730	}
6731
6732	/// EmitTopLevelDecl - Emit code for a single top level declaration.
6733	void CodeGenModule::EmitTopLevelDecl(Decl *D) {
6734	// Ignore dependent declarations.
6735	if (D->isTemplated())
6736	return;
6737
6738	// Consteval function shouldn't be emitted.
6739	if (auto *FD = dyn_cast<FunctionDecl>(Val: D); FD && FD->isImmediateFunction())
6740	return;
6741
6742	switch (D->getKind()) {
6743	case Decl::CXXConversion:
6744	case Decl::CXXMethod:
6745	case Decl::Function:
6746	EmitGlobal(GD: cast<FunctionDecl>(Val: D));
6747	// Always provide some coverage mapping
6748	// even for the functions that aren't emitted.
6749	AddDeferredUnusedCoverageMapping(D);
6750	break;
6751
6752	case Decl::CXXDeductionGuide:
6753	// Function-like, but does not result in code emission.
6754	break;
6755
6756	case Decl::Var:
6757	case Decl::Decomposition:
6758	case Decl::VarTemplateSpecialization:
6759	EmitGlobal(GD: cast<VarDecl>(Val: D));
6760	if (auto *DD = dyn_cast<DecompositionDecl>(Val: D))
6761	for (auto *B : DD->bindings())
6762	if (auto *HD = B->getHoldingVar())
6763	EmitGlobal(GD: HD);
6764	break;
6765
6766	// Indirect fields from global anonymous structs and unions can be
6767	// ignored; only the actual variable requires IR gen support.
6768	case Decl::IndirectField:
6769	break;
6770
6771	// C++ Decls
6772	case Decl::Namespace:
6773	EmitDeclContext(cast<NamespaceDecl>(Val: D));
6774	break;
6775	case Decl::ClassTemplateSpecialization: {
6776	const auto *Spec = cast<ClassTemplateSpecializationDecl>(Val: D);
6777	if (CGDebugInfo *DI = getModuleDebugInfo())
6778	if (Spec->getSpecializationKind() ==
6779	TSK_ExplicitInstantiationDefinition &&
6780	Spec->hasDefinition())
6781	DI->completeTemplateDefinition(SD: *Spec);
6782	} [[fallthrough]];
6783	case Decl::CXXRecord: {
6784	CXXRecordDecl *CRD = cast<CXXRecordDecl>(Val: D);
6785	if (CGDebugInfo *DI = getModuleDebugInfo()) {
6786	if (CRD->hasDefinition())
6787	DI->EmitAndRetainType(Ty: getContext().getRecordType(Decl: cast<RecordDecl>(Val: D)));
6788	if (auto *ES = D->getASTContext().getExternalSource())
6789	if (ES->hasExternalDefinitions(D) == ExternalASTSource::EK_Never)
6790	DI->completeUnusedClass(D: *CRD);
6791	}
6792	// Emit any static data members, they may be definitions.
6793	for (auto *I : CRD->decls())
6794	if (isa<VarDecl>(I) || isa<CXXRecordDecl>(I))
6795	EmitTopLevelDecl(I);
6796	break;
6797	}
6798	// No code generation needed.
6799	case Decl::UsingShadow:
6800	case Decl::ClassTemplate:
6801	case Decl::VarTemplate:
6802	case Decl::Concept:
6803	case Decl::VarTemplatePartialSpecialization:
6804	case Decl::FunctionTemplate:
6805	case Decl::TypeAliasTemplate:
6806	case Decl::Block:
6807	case Decl::Empty:
6808	case Decl::Binding:
6809	break;
6810	case Decl::Using: // using X; [C++]
6811	if (CGDebugInfo *DI = getModuleDebugInfo())
6812	DI->EmitUsingDecl(UD: cast<UsingDecl>(Val&: *D));
6813	break;
6814	case Decl::UsingEnum: // using enum X; [C++]
6815	if (CGDebugInfo *DI = getModuleDebugInfo())
6816	DI->EmitUsingEnumDecl(UD: cast<UsingEnumDecl>(Val&: *D));
6817	break;
6818	case Decl::NamespaceAlias:
6819	if (CGDebugInfo *DI = getModuleDebugInfo())
6820	DI->EmitNamespaceAlias(NA: cast<NamespaceAliasDecl>(Val&: *D));
6821	break;
6822	case Decl::UsingDirective: // using namespace X; [C++]
6823	if (CGDebugInfo *DI = getModuleDebugInfo())
6824	DI->EmitUsingDirective(UD: cast<UsingDirectiveDecl>(Val&: *D));
6825	break;
6826	case Decl::CXXConstructor:
6827	getCXXABI().EmitCXXConstructors(D: cast<CXXConstructorDecl>(Val: D));
6828	break;
6829	case Decl::CXXDestructor:
6830	getCXXABI().EmitCXXDestructors(D: cast<CXXDestructorDecl>(Val: D));
6831	break;
6832
6833	case Decl::StaticAssert:
6834	// Nothing to do.
6835	break;
6836
6837	// Objective-C Decls
6838
6839	// Forward declarations, no (immediate) code generation.
6840	case Decl::ObjCInterface:
6841	case Decl::ObjCCategory:
6842	break;
6843
6844	case Decl::ObjCProtocol: {
6845	auto *Proto = cast<ObjCProtocolDecl>(Val: D);
6846	if (Proto->isThisDeclarationADefinition())
6847	ObjCRuntime->GenerateProtocol(OPD: Proto);
6848	break;
6849	}
6850
6851	case Decl::ObjCCategoryImpl:
6852	// Categories have properties but don't support synthesize so we
6853	// can ignore them here.
6854	ObjCRuntime->GenerateCategory(OCD: cast<ObjCCategoryImplDecl>(Val: D));
6855	break;
6856
6857	case Decl::ObjCImplementation: {
6858	auto *OMD = cast<ObjCImplementationDecl>(Val: D);
6859	EmitObjCPropertyImplementations(D: OMD);
6860	EmitObjCIvarInitializations(D: OMD);
6861	ObjCRuntime->GenerateClass(OID: OMD);
6862	// Emit global variable debug information.
6863	if (CGDebugInfo *DI = getModuleDebugInfo())
6864	if (getCodeGenOpts().hasReducedDebugInfo())
6865	DI->getOrCreateInterfaceType(Ty: getContext().getObjCInterfaceType(
6866	Decl: OMD->getClassInterface()), Loc: OMD->getLocation());
6867	break;
6868	}
6869	case Decl::ObjCMethod: {
6870	auto *OMD = cast<ObjCMethodDecl>(Val: D);
6871	// If this is not a prototype, emit the body.
6872	if (OMD->getBody())
6873	CodeGenFunction(*this).GenerateObjCMethod(OMD);
6874	break;
6875	}
6876	case Decl::ObjCCompatibleAlias:
6877	ObjCRuntime->RegisterAlias(OAD: cast<ObjCCompatibleAliasDecl>(Val: D));
6878	break;
6879
6880	case Decl::PragmaComment: {
6881	const auto *PCD = cast<PragmaCommentDecl>(Val: D);
6882	switch (PCD->getCommentKind()) {
6883	case PCK_Unknown:
6884	llvm_unreachable("unexpected pragma comment kind");
6885	case PCK_Linker:
6886	AppendLinkerOptions(Opts: PCD->getArg());
6887	break;
6888	case PCK_Lib:
6889	AddDependentLib(Lib: PCD->getArg());
6890	break;
6891	case PCK_Compiler:
6892	case PCK_ExeStr:
6893	case PCK_User:
6894	break; // We ignore all of these.
6895	}
6896	break;
6897	}
6898
6899	case Decl::PragmaDetectMismatch: {
6900	const auto *PDMD = cast<PragmaDetectMismatchDecl>(Val: D);
6901	AddDetectMismatch(Name: PDMD->getName(), Value: PDMD->getValue());
6902	break;
6903	}
6904
6905	case Decl::LinkageSpec:
6906	EmitLinkageSpec(LSD: cast<LinkageSpecDecl>(Val: D));
6907	break;
6908
6909	case Decl::FileScopeAsm: {
6910	// File-scope asm is ignored during device-side CUDA compilation.
6911	if (LangOpts.CUDA && LangOpts.CUDAIsDevice)
6912	break;
6913	// File-scope asm is ignored during device-side OpenMP compilation.
6914	if (LangOpts.OpenMPIsTargetDevice)
6915	break;
6916	// File-scope asm is ignored during device-side SYCL compilation.
6917	if (LangOpts.SYCLIsDevice)
6918	break;
6919	auto *AD = cast<FileScopeAsmDecl>(Val: D);
6920	getModule().appendModuleInlineAsm(Asm: AD->getAsmString()->getString());
6921	break;
6922	}
6923
6924	case Decl::TopLevelStmt:
6925	EmitTopLevelStmt(D: cast<TopLevelStmtDecl>(Val: D));
6926	break;
6927
6928	case Decl::Import: {
6929	auto *Import = cast<ImportDecl>(Val: D);
6930
6931	// If we've already imported this module, we're done.
6932	if (!ImportedModules.insert(X: Import->getImportedModule()))
6933	break;
6934
6935	// Emit debug information for direct imports.
6936	if (!Import->getImportedOwningModule()) {
6937	if (CGDebugInfo *DI = getModuleDebugInfo())
6938	DI->EmitImportDecl(ID: *Import);
6939	}
6940
6941	// For C++ standard modules we are done - we will call the module
6942	// initializer for imported modules, and that will likewise call those for
6943	// any imports it has.
6944	if (CXX20ModuleInits && Import->getImportedOwningModule() &&
6945	!Import->getImportedOwningModule()->isModuleMapModule())
6946	break;
6947
6948	// For clang C++ module map modules the initializers for sub-modules are
6949	// emitted here.
6950
6951	// Find all of the submodules and emit the module initializers.
6952	llvm::SmallPtrSet<clang::Module *, 16> Visited;
6953	SmallVector<clang::Module *, 16> Stack;
6954	Visited.insert(Ptr: Import->getImportedModule());
6955	Stack.push_back(Elt: Import->getImportedModule());
6956
6957	while (!Stack.empty()) {
6958	clang::Module *Mod = Stack.pop_back_val();
6959	if (!EmittedModuleInitializers.insert(Ptr: Mod).second)
6960	continue;
6961
6962	for (auto *D : Context.getModuleInitializers(M: Mod))
6963	EmitTopLevelDecl(D);
6964
6965	// Visit the submodules of this module.
6966	for (auto *Submodule : Mod->submodules()) {
6967	// Skip explicit children; they need to be explicitly imported to emit
6968	// the initializers.
6969	if (Submodule->IsExplicit)
6970	continue;
6971
6972	if (Visited.insert(Ptr: Submodule).second)
6973	Stack.push_back(Elt: Submodule);
6974	}
6975	}
6976	break;
6977	}
6978
6979	case Decl::Export:
6980	EmitDeclContext(cast<ExportDecl>(Val: D));
6981	break;
6982
6983	case Decl::OMPThreadPrivate:
6984	EmitOMPThreadPrivateDecl(D: cast<OMPThreadPrivateDecl>(Val: D));
6985	break;
6986
6987	case Decl::OMPAllocate:
6988	EmitOMPAllocateDecl(D: cast<OMPAllocateDecl>(Val: D));
6989	break;
6990
6991	case Decl::OMPDeclareReduction:
6992	EmitOMPDeclareReduction(D: cast<OMPDeclareReductionDecl>(Val: D));
6993	break;
6994
6995	case Decl::OMPDeclareMapper:
6996	EmitOMPDeclareMapper(D: cast<OMPDeclareMapperDecl>(Val: D));
6997	break;
6998
6999	case Decl::OMPRequires:
7000	EmitOMPRequiresDecl(D: cast<OMPRequiresDecl>(Val: D));
7001	break;
7002
7003	case Decl::Typedef:
7004	case Decl::TypeAlias: // using foo = bar; [C++11]
7005	if (CGDebugInfo *DI = getModuleDebugInfo())
7006	DI->EmitAndRetainType(
7007	Ty: getContext().getTypedefType(Decl: cast<TypedefNameDecl>(Val: D)));
7008	break;
7009
7010	case Decl::Record:
7011	if (CGDebugInfo *DI = getModuleDebugInfo())
7012	if (cast<RecordDecl>(Val: D)->getDefinition())
7013	DI->EmitAndRetainType(Ty: getContext().getRecordType(Decl: cast<RecordDecl>(Val: D)));
7014	break;
7015
7016	case Decl::Enum:
7017	if (CGDebugInfo *DI = getModuleDebugInfo())
7018	if (cast<EnumDecl>(Val: D)->getDefinition())
7019	DI->EmitAndRetainType(Ty: getContext().getEnumType(Decl: cast<EnumDecl>(Val: D)));
7020	break;
7021
7022	case Decl::HLSLBuffer:
7023	getHLSLRuntime().addBuffer(D: cast<HLSLBufferDecl>(Val: D));
7024	break;
7025
7026	default:
7027	// Make sure we handled everything we should, every other kind is a
7028	// non-top-level decl. FIXME: Would be nice to have an isTopLevelDeclKind
7029	// function. Need to recode Decl::Kind to do that easily.
7030	assert(isa<TypeDecl>(D) && "Unsupported decl kind");
7031	break;
7032	}
7033	}
7034
7035	void CodeGenModule::AddDeferredUnusedCoverageMapping(Decl *D) {
7036	// Do we need to generate coverage mapping?
7037	if (!CodeGenOpts.CoverageMapping)
7038	return;
7039	switch (D->getKind()) {
7040	case Decl::CXXConversion:
7041	case Decl::CXXMethod:
7042	case Decl::Function:
7043	case Decl::ObjCMethod:
7044	case Decl::CXXConstructor:
7045	case Decl::CXXDestructor: {
7046	if (!cast<FunctionDecl>(Val: D)->doesThisDeclarationHaveABody())
7047	break;
7048	SourceManager &SM = getContext().getSourceManager();
7049	if (LimitedCoverage && SM.getMainFileID() != SM.getFileID(SpellingLoc: D->getBeginLoc()))
7050	break;
7051	DeferredEmptyCoverageMappingDecls.try_emplace(Key: D, Args: true);
7052	break;
7053	}
7054	default:
7055	break;
7056	};
7057	}
7058
7059	void CodeGenModule::ClearUnusedCoverageMapping(const Decl *D) {
7060	// Do we need to generate coverage mapping?
7061	if (!CodeGenOpts.CoverageMapping)
7062	return;
7063	if (const auto *Fn = dyn_cast<FunctionDecl>(Val: D)) {
7064	if (Fn->isTemplateInstantiation())
7065	ClearUnusedCoverageMapping(Fn->getTemplateInstantiationPattern());
7066	}
7067	DeferredEmptyCoverageMappingDecls.insert_or_assign(Key: D, Val: false);
7068	}
7069
7070	void CodeGenModule::EmitDeferredUnusedCoverageMappings() {
7071	// We call takeVector() here to avoid use-after-free.
7072	// FIXME: DeferredEmptyCoverageMappingDecls is getting mutated because
7073	// we deserialize function bodies to emit coverage info for them, and that
7074	// deserializes more declarations. How should we handle that case?
7075	for (const auto &Entry : DeferredEmptyCoverageMappingDecls.takeVector()) {
7076	if (!Entry.second)
7077	continue;
7078	const Decl *D = Entry.first;
7079	switch (D->getKind()) {
7080	case Decl::CXXConversion:
7081	case Decl::CXXMethod:
7082	case Decl::Function:
7083	case Decl::ObjCMethod: {
7084	CodeGenPGO PGO(*this);
7085	GlobalDecl GD(cast<FunctionDecl>(Val: D));
7086	PGO.emitEmptyCounterMapping(D, FuncName: getMangledName(GD),
7087	Linkage: getFunctionLinkage(GD));
7088	break;
7089	}
7090	case Decl::CXXConstructor: {
7091	CodeGenPGO PGO(*this);
7092	GlobalDecl GD(cast<CXXConstructorDecl>(Val: D), Ctor_Base);
7093	PGO.emitEmptyCounterMapping(D, FuncName: getMangledName(GD),
7094	Linkage: getFunctionLinkage(GD));
7095	break;
7096	}
7097	case Decl::CXXDestructor: {
7098	CodeGenPGO PGO(*this);
7099	GlobalDecl GD(cast<CXXDestructorDecl>(Val: D), Dtor_Base);
7100	PGO.emitEmptyCounterMapping(D, FuncName: getMangledName(GD),
7101	Linkage: getFunctionLinkage(GD));
7102	break;
7103	}
7104	default:
7105	break;
7106	};
7107	}
7108	}
7109
7110	void CodeGenModule::EmitMainVoidAlias() {
7111	// In order to transition away from "__original_main" gracefully, emit an
7112	// alias for "main" in the no-argument case so that libc can detect when
7113	// new-style no-argument main is in used.
7114	if (llvm::Function *F = getModule().getFunction(Name: "main")) {
7115	if (!F->isDeclaration() && F->arg_size() == 0 && !F->isVarArg() &&
7116	F->getReturnType()->isIntegerTy(Bitwidth: Context.getTargetInfo().getIntWidth())) {
7117	auto *GA = llvm::GlobalAlias::create(Name: "__main_void", Aliasee: F);
7118	GA->setVisibility(llvm::GlobalValue::HiddenVisibility);
7119	}
7120	}
7121	}
7122
7123	/// Turns the given pointer into a constant.
7124	static llvm::Constant *GetPointerConstant(llvm::LLVMContext &Context,
7125	const void *Ptr) {
7126	uintptr_t PtrInt = reinterpret_cast<uintptr_t>(Ptr);
7127	llvm::Type *i64 = llvm::Type::getInt64Ty(C&: Context);
7128	return llvm::ConstantInt::get(Ty: i64, V: PtrInt);
7129	}
7130
7131	static void EmitGlobalDeclMetadata(CodeGenModule &CGM,
7132	llvm::NamedMDNode *&GlobalMetadata,
7133	GlobalDecl D,
7134	llvm::GlobalValue *Addr) {
7135	if (!GlobalMetadata)
7136	GlobalMetadata =
7137	CGM.getModule().getOrInsertNamedMetadata(Name: "clang.global.decl.ptrs");
7138
7139	// TODO: should we report variant information for ctors/dtors?
7140	llvm::Metadata *Ops[] = {llvm::ConstantAsMetadata::get(C: Addr),
7141	llvm::ConstantAsMetadata::get(C: GetPointerConstant(
7142	Context&: CGM.getLLVMContext(), Ptr: D.getDecl()))};
7143	GlobalMetadata->addOperand(M: llvm::MDNode::get(Context&: CGM.getLLVMContext(), MDs: Ops));
7144	}
7145
7146	bool CodeGenModule::CheckAndReplaceExternCIFuncs(llvm::GlobalValue *Elem,
7147	llvm::GlobalValue *CppFunc) {
7148	// Store the list of ifuncs we need to replace uses in.
7149	llvm::SmallVector<llvm::GlobalIFunc *> IFuncs;
7150	// List of ConstantExprs that we should be able to delete when we're done
7151	// here.
7152	llvm::SmallVector<llvm::ConstantExpr *> CEs;
7153
7154	// It isn't valid to replace the extern-C ifuncs if all we find is itself!
7155	if (Elem == CppFunc)
7156	return false;
7157
7158	// First make sure that all users of this are ifuncs (or ifuncs via a
7159	// bitcast), and collect the list of ifuncs and CEs so we can work on them
7160	// later.
7161	for (llvm::User *User : Elem->users()) {
7162	// Users can either be a bitcast ConstExpr that is used by the ifuncs, OR an
7163	// ifunc directly. In any other case, just give up, as we don't know what we
7164	// could break by changing those.
7165	if (auto *ConstExpr = dyn_cast<llvm::ConstantExpr>(Val: User)) {
7166	if (ConstExpr->getOpcode() != llvm::Instruction::BitCast)
7167	return false;
7168
7169	for (llvm::User *CEUser : ConstExpr->users()) {
7170	if (auto *IFunc = dyn_cast<llvm::GlobalIFunc>(Val: CEUser)) {
7171	IFuncs.push_back(Elt: IFunc);
7172	} else {
7173	return false;
7174	}
7175	}
7176	CEs.push_back(Elt: ConstExpr);
7177	} else if (auto *IFunc = dyn_cast<llvm::GlobalIFunc>(Val: User)) {
7178	IFuncs.push_back(Elt: IFunc);
7179	} else {
7180	// This user is one we don't know how to handle, so fail redirection. This
7181	// will result in an ifunc retaining a resolver name that will ultimately
7182	// fail to be resolved to a defined function.
7183	return false;
7184	}
7185	}
7186
7187	// Now we know this is a valid case where we can do this alias replacement, we
7188	// need to remove all of the references to Elem (and the bitcasts!) so we can
7189	// delete it.
7190	for (llvm::GlobalIFunc *IFunc : IFuncs)
7191	IFunc->setResolver(nullptr);
7192	for (llvm::ConstantExpr *ConstExpr : CEs)
7193	ConstExpr->destroyConstant();
7194
7195	// We should now be out of uses for the 'old' version of this function, so we
7196	// can erase it as well.
7197	Elem->eraseFromParent();
7198
7199	for (llvm::GlobalIFunc *IFunc : IFuncs) {
7200	// The type of the resolver is always just a function-type that returns the
7201	// type of the IFunc, so create that here. If the type of the actual
7202	// resolver doesn't match, it just gets bitcast to the right thing.
7203	auto *ResolverTy =
7204	llvm::FunctionType::get(Result: IFunc->getType(), /*isVarArg*/ false);
7205	llvm::Constant *Resolver = GetOrCreateLLVMFunction(
7206	MangledName: CppFunc->getName(), Ty: ResolverTy, GD: {}, /*ForVTable*/ false);
7207	IFunc->setResolver(Resolver);
7208	}
7209	return true;
7210	}
7211
7212	/// For each function which is declared within an extern "C" region and marked
7213	/// as 'used', but has internal linkage, create an alias from the unmangled
7214	/// name to the mangled name if possible. People expect to be able to refer
7215	/// to such functions with an unmangled name from inline assembly within the
7216	/// same translation unit.
7217	void CodeGenModule::EmitStaticExternCAliases() {
7218	if (!getTargetCodeGenInfo().shouldEmitStaticExternCAliases())
7219	return;
7220	for (auto &I : StaticExternCValues) {
7221	IdentifierInfo *Name = I.first;
7222	llvm::GlobalValue *Val = I.second;
7223
7224	// If Val is null, that implies there were multiple declarations that each
7225	// had a claim to the unmangled name. In this case, generation of the alias
7226	// is suppressed. See CodeGenModule::MaybeHandleStaticInExternC.
7227	if (!Val)
7228	break;
7229
7230	llvm::GlobalValue *ExistingElem =
7231	getModule().getNamedValue(Name: Name->getName());
7232
7233	// If there is either not something already by this name, or we were able to
7234	// replace all uses from IFuncs, create the alias.
7235	if (!ExistingElem || CheckAndReplaceExternCIFuncs(Elem: ExistingElem, CppFunc: Val))
7236	addCompilerUsedGlobal(GV: llvm::GlobalAlias::create(Name: Name->getName(), Aliasee: Val));
7237	}
7238	}
7239
7240	bool CodeGenModule::lookupRepresentativeDecl(StringRef MangledName,
7241	GlobalDecl &Result) const {
7242	auto Res = Manglings.find(Key: MangledName);
7243	if (Res == Manglings.end())
7244	return false;
7245	Result = Res->getValue();
7246	return true;
7247	}
7248
7249	/// Emits metadata nodes associating all the global values in the
7250	/// current module with the Decls they came from. This is useful for
7251	/// projects using IR gen as a subroutine.
7252	///
7253	/// Since there's currently no way to associate an MDNode directly
7254	/// with an llvm::GlobalValue, we create a global named metadata
7255	/// with the name 'clang.global.decl.ptrs'.
7256	void CodeGenModule::EmitDeclMetadata() {
7257	llvm::NamedMDNode *GlobalMetadata = nullptr;
7258
7259	for (auto &I : MangledDeclNames) {
7260	llvm::GlobalValue *Addr = getModule().getNamedValue(Name: I.second);
7261	// Some mangled names don't necessarily have an associated GlobalValue
7262	// in this module, e.g. if we mangled it for DebugInfo.
7263	if (Addr)
7264	EmitGlobalDeclMetadata(CGM&: *this, GlobalMetadata, D: I.first, Addr);
7265	}
7266	}
7267
7268	/// Emits metadata nodes for all the local variables in the current
7269	/// function.
7270	void CodeGenFunction::EmitDeclMetadata() {
7271	if (LocalDeclMap.empty()) return;
7272
7273	llvm::LLVMContext &Context = getLLVMContext();
7274
7275	// Find the unique metadata ID for this name.
7276	unsigned DeclPtrKind = Context.getMDKindID(Name: "clang.decl.ptr");
7277
7278	llvm::NamedMDNode *GlobalMetadata = nullptr;
7279
7280	for (auto &I : LocalDeclMap) {
7281	const Decl *D = I.first;
7282	llvm::Value *Addr = I.second.getPointer();
7283	if (auto *Alloca = dyn_cast<llvm::AllocaInst>(Val: Addr)) {
7284	llvm::Value *DAddr = GetPointerConstant(Context&: getLLVMContext(), Ptr: D);
7285	Alloca->setMetadata(
7286	KindID: DeclPtrKind, Node: llvm::MDNode::get(
7287	Context, MDs: llvm::ValueAsMetadata::getConstant(C: DAddr)));
7288	} else if (auto *GV = dyn_cast<llvm::GlobalValue>(Val: Addr)) {
7289	GlobalDecl GD = GlobalDecl(cast<VarDecl>(Val: D));
7290	EmitGlobalDeclMetadata(CGM, GlobalMetadata, D: GD, Addr: GV);
7291	}
7292	}
7293	}
7294
7295	void CodeGenModule::EmitVersionIdentMetadata() {
7296	llvm::NamedMDNode *IdentMetadata =
7297	TheModule.getOrInsertNamedMetadata(Name: "llvm.ident");
7298	std::string Version = getClangFullVersion();
7299	llvm::LLVMContext &Ctx = TheModule.getContext();
7300
7301	llvm::Metadata *IdentNode[] = {llvm::MDString::get(Context&: Ctx, Str: Version)};
7302	IdentMetadata->addOperand(M: llvm::MDNode::get(Context&: Ctx, MDs: IdentNode));
7303	}
7304
7305	void CodeGenModule::EmitCommandLineMetadata() {
7306	llvm::NamedMDNode *CommandLineMetadata =
7307	TheModule.getOrInsertNamedMetadata(Name: "llvm.commandline");
7308	std::string CommandLine = getCodeGenOpts().RecordCommandLine;
7309	llvm::LLVMContext &Ctx = TheModule.getContext();
7310
7311	llvm::Metadata *CommandLineNode[] = {llvm::MDString::get(Context&: Ctx, Str: CommandLine)};
7312	CommandLineMetadata->addOperand(M: llvm::MDNode::get(Context&: Ctx, MDs: CommandLineNode));
7313	}
7314
7315	void CodeGenModule::EmitCoverageFile() {
7316	llvm::NamedMDNode *CUNode = TheModule.getNamedMetadata(Name: "llvm.dbg.cu");
7317	if (!CUNode)
7318	return;
7319
7320	llvm::NamedMDNode *GCov = TheModule.getOrInsertNamedMetadata(Name: "llvm.gcov");
7321	llvm::LLVMContext &Ctx = TheModule.getContext();
7322	auto *CoverageDataFile =
7323	llvm::MDString::get(Context&: Ctx, Str: getCodeGenOpts().CoverageDataFile);
7324	auto *CoverageNotesFile =
7325	llvm::MDString::get(Context&: Ctx, Str: getCodeGenOpts().CoverageNotesFile);
7326	for (int i = 0, e = CUNode->getNumOperands(); i != e; ++i) {
7327	llvm::MDNode *CU = CUNode->getOperand(i);
7328	llvm::Metadata *Elts[] = {CoverageNotesFile, CoverageDataFile, CU};
7329	GCov->addOperand(M: llvm::MDNode::get(Context&: Ctx, MDs: Elts));
7330	}
7331	}
7332
7333	llvm::Constant *CodeGenModule::GetAddrOfRTTIDescriptor(QualType Ty,
7334	bool ForEH) {
7335	// Return a bogus pointer if RTTI is disabled, unless it's for EH.
7336	// FIXME: should we even be calling this method if RTTI is disabled
7337	// and it's not for EH?
7338	if (!shouldEmitRTTI(ForEH))
7339	return llvm::Constant::getNullValue(Ty: GlobalsInt8PtrTy);
7340
7341	if (ForEH && Ty->isObjCObjectPointerType() &&
7342	LangOpts.ObjCRuntime.isGNUFamily())
7343	return ObjCRuntime->GetEHType(T: Ty);
7344
7345	return getCXXABI().getAddrOfRTTIDescriptor(Ty);
7346	}
7347
7348	void CodeGenModule::EmitOMPThreadPrivateDecl(const OMPThreadPrivateDecl *D) {
7349	// Do not emit threadprivates in simd-only mode.
7350	if (LangOpts.OpenMP && LangOpts.OpenMPSimd)
7351	return;
7352	for (auto RefExpr : D->varlists()) {
7353	auto *VD = cast<VarDecl>(Val: cast<DeclRefExpr>(Val: RefExpr)->getDecl());
7354	bool PerformInit =
7355	VD->getAnyInitializer() &&
7356	!VD->getAnyInitializer()->isConstantInitializer(Ctx&: getContext(),
7357	/*ForRef=*/false);
7358
7359	Address Addr(GetAddrOfGlobalVar(D: VD),
7360	getTypes().ConvertTypeForMem(T: VD->getType()),
7361	getContext().getDeclAlign(VD));
7362	if (auto InitFunction = getOpenMPRuntime().emitThreadPrivateVarDefinition(
7363	VD, Addr, RefExpr->getBeginLoc(), PerformInit))
7364	CXXGlobalInits.push_back(InitFunction);
7365	}
7366	}
7367
7368	llvm::Metadata *
7369	CodeGenModule::CreateMetadataIdentifierImpl(QualType T, MetadataTypeMap &Map,
7370	StringRef Suffix) {
7371	if (auto *FnType = T->getAs<FunctionProtoType>())
7372	T = getContext().getFunctionType(
7373	ResultTy: FnType->getReturnType(), Args: FnType->getParamTypes(),
7374	EPI: FnType->getExtProtoInfo().withExceptionSpec(ESI: EST_None));
7375
7376	llvm::Metadata *&InternalId = Map[T.getCanonicalType()];
7377	if (InternalId)
7378	return InternalId;
7379
7380	if (isExternallyVisible(L: T->getLinkage())) {
7381	std::string OutName;
7382	llvm::raw_string_ostream Out(OutName);
7383	getCXXABI().getMangleContext().mangleCanonicalTypeName(
7384	T, Out, NormalizeIntegers: getCodeGenOpts().SanitizeCfiICallNormalizeIntegers);
7385
7386	if (getCodeGenOpts().SanitizeCfiICallNormalizeIntegers)
7387	Out << ".normalized";
7388
7389	Out << Suffix;
7390
7391	InternalId = llvm::MDString::get(Context&: getLLVMContext(), Str: Out.str());
7392	} else {
7393	InternalId = llvm::MDNode::getDistinct(Context&: getLLVMContext(),
7394	MDs: llvm::ArrayRef<llvm::Metadata *>());
7395	}
7396
7397	return InternalId;
7398	}
7399
7400	llvm::Metadata *CodeGenModule::CreateMetadataIdentifierForType(QualType T) {
7401	return CreateMetadataIdentifierImpl(T, Map&: MetadataIdMap, Suffix: "");
7402	}
7403
7404	llvm::Metadata *
7405	CodeGenModule::CreateMetadataIdentifierForVirtualMemPtrType(QualType T) {
7406	return CreateMetadataIdentifierImpl(T, Map&: VirtualMetadataIdMap, Suffix: ".virtual");
7407	}
7408
7409	// Generalize pointer types to a void pointer with the qualifiers of the
7410	// originally pointed-to type, e.g. 'const char *' and 'char * const *'
7411	// generalize to 'const void *' while 'char *' and 'const char **' generalize to
7412	// 'void *'.
7413	static QualType GeneralizeType(ASTContext &Ctx, QualType Ty) {
7414	if (!Ty->isPointerType())
7415	return Ty;
7416
7417	return Ctx.getPointerType(
7418	T: QualType(Ctx.VoidTy).withCVRQualifiers(
7419	CVR: Ty->getPointeeType().getCVRQualifiers()));
7420	}
7421
7422	// Apply type generalization to a FunctionType's return and argument types
7423	static QualType GeneralizeFunctionType(ASTContext &Ctx, QualType Ty) {
7424	if (auto *FnType = Ty->getAs<FunctionProtoType>()) {
7425	SmallVector<QualType, 8> GeneralizedParams;
7426	for (auto &Param : FnType->param_types())
7427	GeneralizedParams.push_back(Elt: GeneralizeType(Ctx, Ty: Param));
7428
7429	return Ctx.getFunctionType(
7430	ResultTy: GeneralizeType(Ctx, FnType->getReturnType()),
7431	Args: GeneralizedParams, EPI: FnType->getExtProtoInfo());
7432	}
7433
7434	if (auto *FnType = Ty->getAs<FunctionNoProtoType>())
7435	return Ctx.getFunctionNoProtoType(
7436	GeneralizeType(Ctx, FnType->getReturnType()));
7437
7438	llvm_unreachable("Encountered unknown FunctionType");
7439	}
7440
7441	llvm::Metadata *CodeGenModule::CreateMetadataIdentifierGeneralized(QualType T) {
7442	return CreateMetadataIdentifierImpl(T: GeneralizeFunctionType(Ctx&: getContext(), Ty: T),
7443	Map&: GeneralizedMetadataIdMap, Suffix: ".generalized");
7444	}
7445
7446	/// Returns whether this module needs the "all-vtables" type identifier.
7447	bool CodeGenModule::NeedAllVtablesTypeId() const {
7448	// Returns true if at least one of vtable-based CFI checkers is enabled and
7449	// is not in the trapping mode.
7450	return ((LangOpts.Sanitize.has(K: SanitizerKind::CFIVCall) &&
7451	!CodeGenOpts.SanitizeTrap.has(K: SanitizerKind::CFIVCall)) ||
7452	(LangOpts.Sanitize.has(K: SanitizerKind::CFINVCall) &&
7453	!CodeGenOpts.SanitizeTrap.has(K: SanitizerKind::CFINVCall)) ||
7454	(LangOpts.Sanitize.has(K: SanitizerKind::CFIDerivedCast) &&
7455	!CodeGenOpts.SanitizeTrap.has(K: SanitizerKind::CFIDerivedCast)) ||
7456	(LangOpts.Sanitize.has(K: SanitizerKind::CFIUnrelatedCast) &&
7457	!CodeGenOpts.SanitizeTrap.has(K: SanitizerKind::CFIUnrelatedCast)));
7458	}
7459
7460	void CodeGenModule::AddVTableTypeMetadata(llvm::GlobalVariable *VTable,
7461	CharUnits Offset,
7462	const CXXRecordDecl *RD) {
7463	llvm::Metadata *MD =
7464	CreateMetadataIdentifierForType(T: QualType(RD->getTypeForDecl(), 0));
7465	VTable->addTypeMetadata(Offset: Offset.getQuantity(), TypeID: MD);
7466
7467	if (CodeGenOpts.SanitizeCfiCrossDso)
7468	if (auto CrossDsoTypeId = CreateCrossDsoCfiTypeId(MD))
7469	VTable->addTypeMetadata(Offset: Offset.getQuantity(),
7470	TypeID: llvm::ConstantAsMetadata::get(C: CrossDsoTypeId));
7471
7472	if (NeedAllVtablesTypeId()) {
7473	llvm::Metadata *MD = llvm::MDString::get(Context&: getLLVMContext(), Str: "all-vtables");
7474	VTable->addTypeMetadata(Offset: Offset.getQuantity(), TypeID: MD);
7475	}
7476	}
7477
7478	llvm::SanitizerStatReport &CodeGenModule::getSanStats() {
7479	if (!SanStats)
7480	SanStats = std::make_unique<llvm::SanitizerStatReport>(args: &getModule());
7481
7482	return *SanStats;
7483	}
7484
7485	llvm::Value *
7486	CodeGenModule::createOpenCLIntToSamplerConversion(const Expr *E,
7487	CodeGenFunction &CGF) {
7488	llvm::Constant *C = ConstantEmitter(CGF).emitAbstract(E, T: E->getType());
7489	auto *SamplerT = getOpenCLRuntime().getSamplerType(T: E->getType().getTypePtr());
7490	auto *FTy = llvm::FunctionType::get(Result: SamplerT, Params: {C->getType()}, isVarArg: false);
7491	auto *Call = CGF.EmitRuntimeCall(
7492	callee: CreateRuntimeFunction(FTy, Name: "__translate_sampler_initializer"), args: {C});
7493	return Call;
7494	}
7495
7496	CharUnits CodeGenModule::getNaturalPointeeTypeAlignment(
7497	QualType T, LValueBaseInfo *BaseInfo, TBAAAccessInfo *TBAAInfo) {
7498	return getNaturalTypeAlignment(T: T->getPointeeType(), BaseInfo, TBAAInfo,
7499	/* forPointeeType= */ true);
7500	}
7501
7502	CharUnits CodeGenModule::getNaturalTypeAlignment(QualType T,
7503	LValueBaseInfo *BaseInfo,
7504	TBAAAccessInfo *TBAAInfo,
7505	bool forPointeeType) {
7506	if (TBAAInfo)
7507	*TBAAInfo = getTBAAAccessInfo(AccessType: T);
7508
7509	// FIXME: This duplicates logic in ASTContext::getTypeAlignIfKnown. But
7510	// that doesn't return the information we need to compute BaseInfo.
7511
7512	// Honor alignment typedef attributes even on incomplete types.
7513	// We also honor them straight for C++ class types, even as pointees;
7514	// there's an expressivity gap here.
7515	if (auto TT = T->getAs<TypedefType>()) {
7516	if (auto Align = TT->getDecl()->getMaxAlignment()) {
7517	if (BaseInfo)
7518	*BaseInfo = LValueBaseInfo(AlignmentSource::AttributedType);
7519	return getContext().toCharUnitsFromBits(BitSize: Align);
7520	}
7521	}
7522
7523	bool AlignForArray = T->isArrayType();
7524
7525	// Analyze the base element type, so we don't get confused by incomplete
7526	// array types.
7527	T = getContext().getBaseElementType(QT: T);
7528
7529	if (T->isIncompleteType()) {
7530	// We could try to replicate the logic from
7531	// ASTContext::getTypeAlignIfKnown, but nothing uses the alignment if the
7532	// type is incomplete, so it's impossible to test. We could try to reuse
7533	// getTypeAlignIfKnown, but that doesn't return the information we need
7534	// to set BaseInfo. So just ignore the possibility that the alignment is
7535	// greater than one.
7536	if (BaseInfo)
7537	*BaseInfo = LValueBaseInfo(AlignmentSource::Type);
7538	return CharUnits::One();
7539	}
7540
7541	if (BaseInfo)
7542	*BaseInfo = LValueBaseInfo(AlignmentSource::Type);
7543
7544	CharUnits Alignment;
7545	const CXXRecordDecl *RD;
7546	if (T.getQualifiers().hasUnaligned()) {
7547	Alignment = CharUnits::One();
7548	} else if (forPointeeType && !AlignForArray &&
7549	(RD = T->getAsCXXRecordDecl())) {
7550	// For C++ class pointees, we don't know whether we're pointing at a
7551	// base or a complete object, so we generally need to use the
7552	// non-virtual alignment.
7553	Alignment = getClassPointerAlignment(CD: RD);
7554	} else {
7555	Alignment = getContext().getTypeAlignInChars(T);
7556	}
7557
7558	// Cap to the global maximum type alignment unless the alignment
7559	// was somehow explicit on the type.
7560	if (unsigned MaxAlign = getLangOpts().MaxTypeAlign) {
7561	if (Alignment.getQuantity() > MaxAlign &&
7562	!getContext().isAlignmentRequired(T))
7563	Alignment = CharUnits::fromQuantity(Quantity: MaxAlign);
7564	}
7565	return Alignment;
7566	}
7567
7568	bool CodeGenModule::stopAutoInit() {
7569	unsigned StopAfter = getContext().getLangOpts().TrivialAutoVarInitStopAfter;
7570	if (StopAfter) {
7571	// This number is positive only when -ftrivial-auto-var-init-stop-after=* is
7572	// used
7573	if (NumAutoVarInit >= StopAfter) {
7574	return true;
7575	}
7576	if (!NumAutoVarInit) {
7577	unsigned DiagID = getDiags().getCustomDiagID(
7578	L: DiagnosticsEngine::Warning,
7579	FormatString: "-ftrivial-auto-var-init-stop-after=%0 has been enabled to limit the "
7580	"number of times ftrivial-auto-var-init=%1 gets applied.");
7581	getDiags().Report(DiagID)
7582	<< StopAfter
7583	<< (getContext().getLangOpts().getTrivialAutoVarInit() ==
7584	LangOptions::TrivialAutoVarInitKind::Zero
7585	? "zero"
7586	: "pattern");
7587	}
7588	++NumAutoVarInit;
7589	}
7590	return false;
7591	}
7592
7593	void CodeGenModule::printPostfixForExternalizedDecl(llvm::raw_ostream &OS,
7594	const Decl *D) const {
7595	// ptxas does not allow '.' in symbol names. On the other hand, HIP prefers
7596	// postfix beginning with '.' since the symbol name can be demangled.
7597	if (LangOpts.HIP)
7598	OS << (isa<VarDecl>(Val: D) ? ".static." : ".intern.");
7599	else
7600	OS << (isa<VarDecl>(Val: D) ? "__static__" : "__intern__");
7601
7602	// If the CUID is not specified we try to generate a unique postfix.
7603	if (getLangOpts().CUID.empty()) {
7604	SourceManager &SM = getContext().getSourceManager();
7605	PresumedLoc PLoc = SM.getPresumedLoc(Loc: D->getLocation());
7606	assert(PLoc.isValid() && "Source location is expected to be valid.");
7607
7608	// Get the hash of the user defined macros.
7609	llvm::MD5 Hash;
7610	llvm::MD5::MD5Result Result;
7611	for (const auto &Arg : PreprocessorOpts.Macros)
7612	Hash.update(Str: Arg.first);
7613	Hash.final(Result);
7614
7615	// Get the UniqueID for the file containing the decl.
7616	llvm::sys::fs::UniqueID ID;
7617	if (llvm::sys::fs::getUniqueID(Path: PLoc.getFilename(), Result&: ID)) {
7618	PLoc = SM.getPresumedLoc(Loc: D->getLocation(), /*UseLineDirectives=*/false);
7619	assert(PLoc.isValid() && "Source location is expected to be valid.");
7620	if (auto EC = llvm::sys::fs::getUniqueID(PLoc.getFilename(), ID))
7621	SM.getDiagnostics().Report(diag::err_cannot_open_file)
7622	<< PLoc.getFilename() << EC.message();
7623	}
7624	OS << llvm::format(Fmt: "%x", Vals: ID.getFile()) << llvm::format(Fmt: "%x", Vals: ID.getDevice())
7625	<< "_" << llvm::utohexstr(X: Result.low(), /*LowerCase=*/true, /*Width=*/8);
7626	} else {
7627	OS << getContext().getCUIDHash();
7628	}
7629	}
7630
7631	void CodeGenModule::moveLazyEmissionStates(CodeGenModule *NewBuilder) {
7632	assert(DeferredDeclsToEmit.empty() &&
7633	"Should have emitted all decls deferred to emit.");
7634	assert(NewBuilder->DeferredDecls.empty() &&
7635	"Newly created module should not have deferred decls");
7636	NewBuilder->DeferredDecls = std::move(DeferredDecls);
7637	assert(EmittedDeferredDecls.empty() &&
7638	"Still have (unmerged) EmittedDeferredDecls deferred decls");
7639
7640	assert(NewBuilder->DeferredVTables.empty() &&
7641	"Newly created module should not have deferred vtables");
7642	NewBuilder->DeferredVTables = std::move(DeferredVTables);
7643
7644	assert(NewBuilder->MangledDeclNames.empty() &&
7645	"Newly created module should not have mangled decl names");
7646	assert(NewBuilder->Manglings.empty() &&
7647	"Newly created module should not have manglings");
7648	NewBuilder->Manglings = std::move(Manglings);
7649
7650	NewBuilder->WeakRefReferences = std::move(WeakRefReferences);
7651
7652	NewBuilder->TBAA = std::move(TBAA);
7653
7654	NewBuilder->ABI->MangleCtx = std::move(ABI->MangleCtx);
7655	}
7656