1 //===--- CodeGenModule.cpp - Emit LLVM Code from ASTs for a Module --------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This coordinates the per-module state used while generating code.
12 //===----------------------------------------------------------------------===//
14 #include "CodeGenModule.h"
16 #include "CGCUDARuntime.h"
19 #include "CGDebugInfo.h"
20 #include "CGObjCRuntime.h"
21 #include "CGOpenCLRuntime.h"
22 #include "CGOpenMPRuntime.h"
23 #include "CGOpenMPRuntimeNVPTX.h"
24 #include "CodeGenFunction.h"
25 #include "CodeGenPGO.h"
26 #include "CodeGenTBAA.h"
27 #include "CoverageMappingGen.h"
28 #include "TargetInfo.h"
29 #include "clang/AST/ASTContext.h"
30 #include "clang/AST/CharUnits.h"
31 #include "clang/AST/DeclCXX.h"
32 #include "clang/AST/DeclObjC.h"
33 #include "clang/AST/DeclTemplate.h"
34 #include "clang/AST/Mangle.h"
35 #include "clang/AST/RecordLayout.h"
36 #include "clang/AST/RecursiveASTVisitor.h"
37 #include "clang/Basic/Builtins.h"
38 #include "clang/Basic/CharInfo.h"
39 #include "clang/Basic/Diagnostic.h"
40 #include "clang/Basic/Module.h"
41 #include "clang/Basic/SourceManager.h"
42 #include "clang/Basic/TargetInfo.h"
43 #include "clang/Basic/Version.h"
44 #include "clang/CodeGen/ConstantInitBuilder.h"
45 #include "clang/Frontend/CodeGenOptions.h"
46 #include "clang/Sema/SemaDiagnostic.h"
47 #include "llvm/ADT/Triple.h"
48 #include "llvm/IR/CallSite.h"
49 #include "llvm/IR/CallingConv.h"
50 #include "llvm/IR/DataLayout.h"
51 #include "llvm/IR/Intrinsics.h"
52 #include "llvm/IR/LLVMContext.h"
53 #include "llvm/IR/Module.h"
54 #include "llvm/ProfileData/InstrProfReader.h"
55 #include "llvm/Support/ConvertUTF.h"
56 #include "llvm/Support/ErrorHandling.h"
57 #include "llvm/Support/MD5.h"
59 using namespace clang;
60 using namespace CodeGen;
62 static const char AnnotationSection[] = "llvm.metadata";
64 static CGCXXABI *createCXXABI(CodeGenModule &CGM) {
65 switch (CGM.getTarget().getCXXABI().getKind()) {
66 case TargetCXXABI::GenericAArch64:
67 case TargetCXXABI::GenericARM:
68 case TargetCXXABI::iOS:
69 case TargetCXXABI::iOS64:
70 case TargetCXXABI::WatchOS:
71 case TargetCXXABI::GenericMIPS:
72 case TargetCXXABI::GenericItanium:
73 case TargetCXXABI::WebAssembly:
74 return CreateItaniumCXXABI(CGM);
75 case TargetCXXABI::Microsoft:
76 return CreateMicrosoftCXXABI(CGM);
79 llvm_unreachable("invalid C++ ABI kind");
82 CodeGenModule::CodeGenModule(ASTContext &C, const HeaderSearchOptions &HSO,
83 const PreprocessorOptions &PPO,
84 const CodeGenOptions &CGO, llvm::Module &M,
85 DiagnosticsEngine &diags,
86 CoverageSourceInfo *CoverageInfo)
87 : Context(C), LangOpts(C.getLangOpts()), HeaderSearchOpts(HSO),
88 PreprocessorOpts(PPO), CodeGenOpts(CGO), TheModule(M), Diags(diags),
89 Target(C.getTargetInfo()), ABI(createCXXABI(*this)),
90 VMContext(M.getContext()), Types(*this), VTables(*this),
91 SanitizerMD(new SanitizerMetadata(*this)) {
93 // Initialize the type cache.
94 llvm::LLVMContext &LLVMContext = M.getContext();
95 VoidTy = llvm::Type::getVoidTy(LLVMContext);
96 Int8Ty = llvm::Type::getInt8Ty(LLVMContext);
97 Int16Ty = llvm::Type::getInt16Ty(LLVMContext);
98 Int32Ty = llvm::Type::getInt32Ty(LLVMContext);
99 Int64Ty = llvm::Type::getInt64Ty(LLVMContext);
100 FloatTy = llvm::Type::getFloatTy(LLVMContext);
101 DoubleTy = llvm::Type::getDoubleTy(LLVMContext);
102 PointerWidthInBits = C.getTargetInfo().getPointerWidth(0);
103 PointerAlignInBytes =
104 C.toCharUnitsFromBits(C.getTargetInfo().getPointerAlign(0)).getQuantity();
106 C.toCharUnitsFromBits(C.getTargetInfo().getMaxPointerWidth()).getQuantity();
108 C.toCharUnitsFromBits(C.getTargetInfo().getIntAlign()).getQuantity();
109 IntTy = llvm::IntegerType::get(LLVMContext, C.getTargetInfo().getIntWidth());
110 IntPtrTy = llvm::IntegerType::get(LLVMContext,
111 C.getTargetInfo().getMaxPointerWidth());
112 Int8PtrTy = Int8Ty->getPointerTo(0);
113 Int8PtrPtrTy = Int8PtrTy->getPointerTo(0);
114 AllocaInt8PtrTy = Int8Ty->getPointerTo(
115 M.getDataLayout().getAllocaAddrSpace());
117 RuntimeCC = getTargetCodeGenInfo().getABIInfo().getRuntimeCC();
118 BuiltinCC = getTargetCodeGenInfo().getABIInfo().getBuiltinCC();
123 createOpenCLRuntime();
125 createOpenMPRuntime();
129 // Enable TBAA unless it's suppressed. ThreadSanitizer needs TBAA even at O0.
130 if (LangOpts.Sanitize.has(SanitizerKind::Thread) ||
131 (!CodeGenOpts.RelaxedAliasing && CodeGenOpts.OptimizationLevel > 0))
132 TBAA.reset(new CodeGenTBAA(Context, VMContext, CodeGenOpts, getLangOpts(),
133 getCXXABI().getMangleContext()));
135 // If debug info or coverage generation is enabled, create the CGDebugInfo
137 if (CodeGenOpts.getDebugInfo() != codegenoptions::NoDebugInfo ||
138 CodeGenOpts.EmitGcovArcs || CodeGenOpts.EmitGcovNotes)
139 DebugInfo.reset(new CGDebugInfo(*this));
141 Block.GlobalUniqueCount = 0;
143 if (C.getLangOpts().ObjC1)
144 ObjCData.reset(new ObjCEntrypoints());
146 if (CodeGenOpts.hasProfileClangUse()) {
147 auto ReaderOrErr = llvm::IndexedInstrProfReader::create(
148 CodeGenOpts.ProfileInstrumentUsePath);
149 if (auto E = ReaderOrErr.takeError()) {
150 unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
151 "Could not read profile %0: %1");
152 llvm::handleAllErrors(std::move(E), [&](const llvm::ErrorInfoBase &EI) {
153 getDiags().Report(DiagID) << CodeGenOpts.ProfileInstrumentUsePath
157 PGOReader = std::move(ReaderOrErr.get());
160 // If coverage mapping generation is enabled, create the
161 // CoverageMappingModuleGen object.
162 if (CodeGenOpts.CoverageMapping)
163 CoverageMapping.reset(new CoverageMappingModuleGen(*this, *CoverageInfo));
166 CodeGenModule::~CodeGenModule() {}
168 void CodeGenModule::createObjCRuntime() {
169 // This is just isGNUFamily(), but we want to force implementors of
170 // new ABIs to decide how best to do this.
171 switch (LangOpts.ObjCRuntime.getKind()) {
172 case ObjCRuntime::GNUstep:
173 case ObjCRuntime::GCC:
174 case ObjCRuntime::ObjFW:
175 ObjCRuntime.reset(CreateGNUObjCRuntime(*this));
178 case ObjCRuntime::FragileMacOSX:
179 case ObjCRuntime::MacOSX:
180 case ObjCRuntime::iOS:
181 case ObjCRuntime::WatchOS:
182 ObjCRuntime.reset(CreateMacObjCRuntime(*this));
185 llvm_unreachable("bad runtime kind");
188 void CodeGenModule::createOpenCLRuntime() {
189 OpenCLRuntime.reset(new CGOpenCLRuntime(*this));
192 void CodeGenModule::createOpenMPRuntime() {
193 // Select a specialized code generation class based on the target, if any.
194 // If it does not exist use the default implementation.
195 switch (getTriple().getArch()) {
196 case llvm::Triple::nvptx:
197 case llvm::Triple::nvptx64:
198 assert(getLangOpts().OpenMPIsDevice &&
199 "OpenMP NVPTX is only prepared to deal with device code.");
200 OpenMPRuntime.reset(new CGOpenMPRuntimeNVPTX(*this));
203 OpenMPRuntime.reset(new CGOpenMPRuntime(*this));
208 void CodeGenModule::createCUDARuntime() {
209 CUDARuntime.reset(CreateNVCUDARuntime(*this));
212 void CodeGenModule::addReplacement(StringRef Name, llvm::Constant *C) {
213 Replacements[Name] = C;
216 void CodeGenModule::applyReplacements() {
217 for (auto &I : Replacements) {
218 StringRef MangledName = I.first();
219 llvm::Constant *Replacement = I.second;
220 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
223 auto *OldF = cast<llvm::Function>(Entry);
224 auto *NewF = dyn_cast<llvm::Function>(Replacement);
226 if (auto *Alias = dyn_cast<llvm::GlobalAlias>(Replacement)) {
227 NewF = dyn_cast<llvm::Function>(Alias->getAliasee());
229 auto *CE = cast<llvm::ConstantExpr>(Replacement);
230 assert(CE->getOpcode() == llvm::Instruction::BitCast ||
231 CE->getOpcode() == llvm::Instruction::GetElementPtr);
232 NewF = dyn_cast<llvm::Function>(CE->getOperand(0));
236 // Replace old with new, but keep the old order.
237 OldF->replaceAllUsesWith(Replacement);
239 NewF->removeFromParent();
240 OldF->getParent()->getFunctionList().insertAfter(OldF->getIterator(),
243 OldF->eraseFromParent();
247 void CodeGenModule::addGlobalValReplacement(llvm::GlobalValue *GV, llvm::Constant *C) {
248 GlobalValReplacements.push_back(std::make_pair(GV, C));
251 void CodeGenModule::applyGlobalValReplacements() {
252 for (auto &I : GlobalValReplacements) {
253 llvm::GlobalValue *GV = I.first;
254 llvm::Constant *C = I.second;
256 GV->replaceAllUsesWith(C);
257 GV->eraseFromParent();
261 // This is only used in aliases that we created and we know they have a
263 static const llvm::GlobalObject *getAliasedGlobal(
264 const llvm::GlobalIndirectSymbol &GIS) {
265 llvm::SmallPtrSet<const llvm::GlobalIndirectSymbol*, 4> Visited;
266 const llvm::Constant *C = &GIS;
268 C = C->stripPointerCasts();
269 if (auto *GO = dyn_cast<llvm::GlobalObject>(C))
271 // stripPointerCasts will not walk over weak aliases.
272 auto *GIS2 = dyn_cast<llvm::GlobalIndirectSymbol>(C);
275 if (!Visited.insert(GIS2).second)
277 C = GIS2->getIndirectSymbol();
281 void CodeGenModule::checkAliases() {
282 // Check if the constructed aliases are well formed. It is really unfortunate
283 // that we have to do this in CodeGen, but we only construct mangled names
284 // and aliases during codegen.
286 DiagnosticsEngine &Diags = getDiags();
287 for (const GlobalDecl &GD : Aliases) {
288 const auto *D = cast<ValueDecl>(GD.getDecl());
289 SourceLocation Location;
290 bool IsIFunc = D->hasAttr<IFuncAttr>();
291 if (const Attr *A = D->getDefiningAttr())
292 Location = A->getLocation();
294 llvm_unreachable("Not an alias or ifunc?");
295 StringRef MangledName = getMangledName(GD);
296 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
297 auto *Alias = cast<llvm::GlobalIndirectSymbol>(Entry);
298 const llvm::GlobalValue *GV = getAliasedGlobal(*Alias);
301 Diags.Report(Location, diag::err_cyclic_alias) << IsIFunc;
302 } else if (GV->isDeclaration()) {
304 Diags.Report(Location, diag::err_alias_to_undefined)
305 << IsIFunc << IsIFunc;
306 } else if (IsIFunc) {
307 // Check resolver function type.
308 llvm::FunctionType *FTy = dyn_cast<llvm::FunctionType>(
309 GV->getType()->getPointerElementType());
311 if (!FTy->getReturnType()->isPointerTy())
312 Diags.Report(Location, diag::err_ifunc_resolver_return);
313 if (FTy->getNumParams())
314 Diags.Report(Location, diag::err_ifunc_resolver_params);
317 llvm::Constant *Aliasee = Alias->getIndirectSymbol();
318 llvm::GlobalValue *AliaseeGV;
319 if (auto CE = dyn_cast<llvm::ConstantExpr>(Aliasee))
320 AliaseeGV = cast<llvm::GlobalValue>(CE->getOperand(0));
322 AliaseeGV = cast<llvm::GlobalValue>(Aliasee);
324 if (const SectionAttr *SA = D->getAttr<SectionAttr>()) {
325 StringRef AliasSection = SA->getName();
326 if (AliasSection != AliaseeGV->getSection())
327 Diags.Report(SA->getLocation(), diag::warn_alias_with_section)
328 << AliasSection << IsIFunc << IsIFunc;
331 // We have to handle alias to weak aliases in here. LLVM itself disallows
332 // this since the object semantics would not match the IL one. For
333 // compatibility with gcc we implement it by just pointing the alias
334 // to its aliasee's aliasee. We also warn, since the user is probably
335 // expecting the link to be weak.
336 if (auto GA = dyn_cast<llvm::GlobalIndirectSymbol>(AliaseeGV)) {
337 if (GA->isInterposable()) {
338 Diags.Report(Location, diag::warn_alias_to_weak_alias)
339 << GV->getName() << GA->getName() << IsIFunc;
340 Aliasee = llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(
341 GA->getIndirectSymbol(), Alias->getType());
342 Alias->setIndirectSymbol(Aliasee);
349 for (const GlobalDecl &GD : Aliases) {
350 StringRef MangledName = getMangledName(GD);
351 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
352 auto *Alias = dyn_cast<llvm::GlobalIndirectSymbol>(Entry);
353 Alias->replaceAllUsesWith(llvm::UndefValue::get(Alias->getType()));
354 Alias->eraseFromParent();
358 void CodeGenModule::clear() {
359 DeferredDeclsToEmit.clear();
361 OpenMPRuntime->clear();
364 void InstrProfStats::reportDiagnostics(DiagnosticsEngine &Diags,
365 StringRef MainFile) {
366 if (!hasDiagnostics())
368 if (VisitedInMainFile > 0 && VisitedInMainFile == MissingInMainFile) {
369 if (MainFile.empty())
370 MainFile = "<stdin>";
371 Diags.Report(diag::warn_profile_data_unprofiled) << MainFile;
374 Diags.Report(diag::warn_profile_data_out_of_date) << Visited << Mismatched;
377 Diags.Report(diag::warn_profile_data_missing) << Visited << Missing;
381 void CodeGenModule::Release() {
383 applyGlobalValReplacements();
386 EmitCXXGlobalInitFunc();
387 EmitCXXGlobalDtorFunc();
388 EmitCXXThreadLocalInitFunc();
390 if (llvm::Function *ObjCInitFunction = ObjCRuntime->ModuleInitFunction())
391 AddGlobalCtor(ObjCInitFunction);
392 if (Context.getLangOpts().CUDA && !Context.getLangOpts().CUDAIsDevice &&
394 if (llvm::Function *CudaCtorFunction = CUDARuntime->makeModuleCtorFunction())
395 AddGlobalCtor(CudaCtorFunction);
396 if (llvm::Function *CudaDtorFunction = CUDARuntime->makeModuleDtorFunction())
397 AddGlobalDtor(CudaDtorFunction);
400 if (llvm::Function *OpenMPRegistrationFunction =
401 OpenMPRuntime->emitRegistrationFunction())
402 AddGlobalCtor(OpenMPRegistrationFunction, 0);
404 getModule().setProfileSummary(PGOReader->getSummary().getMD(VMContext));
405 if (PGOStats.hasDiagnostics())
406 PGOStats.reportDiagnostics(getDiags(), getCodeGenOpts().MainFileName);
408 EmitCtorList(GlobalCtors, "llvm.global_ctors");
409 EmitCtorList(GlobalDtors, "llvm.global_dtors");
410 EmitGlobalAnnotations();
411 EmitStaticExternCAliases();
412 EmitDeferredUnusedCoverageMappings();
414 CoverageMapping->emit();
415 if (CodeGenOpts.SanitizeCfiCrossDso) {
416 CodeGenFunction(*this).EmitCfiCheckFail();
417 CodeGenFunction(*this).EmitCfiCheckStub();
419 emitAtAvailableLinkGuard();
424 if (CodeGenOpts.Autolink &&
425 (Context.getLangOpts().Modules || !LinkerOptionsMetadata.empty())) {
426 EmitModuleLinkOptions();
429 // Record mregparm value now so it is visible through rest of codegen.
430 if (Context.getTargetInfo().getTriple().getArch() == llvm::Triple::x86)
431 getModule().addModuleFlag(llvm::Module::Error, "NumRegisterParameters",
432 CodeGenOpts.NumRegisterParameters);
434 if (CodeGenOpts.DwarfVersion) {
435 // We actually want the latest version when there are conflicts.
436 // We can change from Warning to Latest if such mode is supported.
437 getModule().addModuleFlag(llvm::Module::Warning, "Dwarf Version",
438 CodeGenOpts.DwarfVersion);
440 if (CodeGenOpts.EmitCodeView) {
441 // Indicate that we want CodeView in the metadata.
442 getModule().addModuleFlag(llvm::Module::Warning, "CodeView", 1);
444 if (CodeGenOpts.OptimizationLevel > 0 && CodeGenOpts.StrictVTablePointers) {
445 // We don't support LTO with 2 with different StrictVTablePointers
446 // FIXME: we could support it by stripping all the information introduced
447 // by StrictVTablePointers.
449 getModule().addModuleFlag(llvm::Module::Error, "StrictVTablePointers",1);
451 llvm::Metadata *Ops[2] = {
452 llvm::MDString::get(VMContext, "StrictVTablePointers"),
453 llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
454 llvm::Type::getInt32Ty(VMContext), 1))};
456 getModule().addModuleFlag(llvm::Module::Require,
457 "StrictVTablePointersRequirement",
458 llvm::MDNode::get(VMContext, Ops));
461 // We support a single version in the linked module. The LLVM
462 // parser will drop debug info with a different version number
463 // (and warn about it, too).
464 getModule().addModuleFlag(llvm::Module::Warning, "Debug Info Version",
465 llvm::DEBUG_METADATA_VERSION);
467 // We need to record the widths of enums and wchar_t, so that we can generate
468 // the correct build attributes in the ARM backend.
469 llvm::Triple::ArchType Arch = Context.getTargetInfo().getTriple().getArch();
470 if ( Arch == llvm::Triple::arm
471 || Arch == llvm::Triple::armeb
472 || Arch == llvm::Triple::thumb
473 || Arch == llvm::Triple::thumbeb) {
474 // Width of wchar_t in bytes
475 uint64_t WCharWidth =
476 Context.getTypeSizeInChars(Context.getWideCharType()).getQuantity();
477 getModule().addModuleFlag(llvm::Module::Error, "wchar_size", WCharWidth);
479 // The minimum width of an enum in bytes
480 uint64_t EnumWidth = Context.getLangOpts().ShortEnums ? 1 : 4;
481 getModule().addModuleFlag(llvm::Module::Error, "min_enum_size", EnumWidth);
484 if (CodeGenOpts.SanitizeCfiCrossDso) {
485 // Indicate that we want cross-DSO control flow integrity checks.
486 getModule().addModuleFlag(llvm::Module::Override, "Cross-DSO CFI", 1);
489 if (LangOpts.CUDAIsDevice && getTriple().isNVPTX()) {
490 // Indicate whether __nvvm_reflect should be configured to flush denormal
491 // floating point values to 0. (This corresponds to its "__CUDA_FTZ"
493 getModule().addModuleFlag(llvm::Module::Override, "nvvm-reflect-ftz",
494 LangOpts.CUDADeviceFlushDenormalsToZero ? 1 : 0);
497 if (uint32_t PLevel = Context.getLangOpts().PICLevel) {
498 assert(PLevel < 3 && "Invalid PIC Level");
499 getModule().setPICLevel(static_cast<llvm::PICLevel::Level>(PLevel));
500 if (Context.getLangOpts().PIE)
501 getModule().setPIELevel(static_cast<llvm::PIELevel::Level>(PLevel));
504 SimplifyPersonality();
506 if (getCodeGenOpts().EmitDeclMetadata)
509 if (getCodeGenOpts().EmitGcovArcs || getCodeGenOpts().EmitGcovNotes)
513 DebugInfo->finalize();
515 EmitVersionIdentMetadata();
517 EmitTargetMetadata();
520 void CodeGenModule::UpdateCompletedType(const TagDecl *TD) {
521 // Make sure that this type is translated.
522 Types.UpdateCompletedType(TD);
525 void CodeGenModule::RefreshTypeCacheForClass(const CXXRecordDecl *RD) {
526 // Make sure that this type is translated.
527 Types.RefreshTypeCacheForClass(RD);
530 llvm::MDNode *CodeGenModule::getTBAAInfo(QualType QTy) {
533 return TBAA->getTBAAInfo(QTy);
536 llvm::MDNode *CodeGenModule::getTBAAInfoForVTablePtr() {
539 return TBAA->getTBAAInfoForVTablePtr();
542 llvm::MDNode *CodeGenModule::getTBAAStructInfo(QualType QTy) {
545 return TBAA->getTBAAStructInfo(QTy);
548 llvm::MDNode *CodeGenModule::getTBAAStructTagInfo(QualType BaseTy,
549 llvm::MDNode *AccessN,
553 return TBAA->getTBAAStructTagInfo(BaseTy, AccessN, O);
556 /// Decorate the instruction with a TBAA tag. For both scalar TBAA
557 /// and struct-path aware TBAA, the tag has the same format:
558 /// base type, access type and offset.
559 /// When ConvertTypeToTag is true, we create a tag based on the scalar type.
560 void CodeGenModule::DecorateInstructionWithTBAA(llvm::Instruction *Inst,
561 llvm::MDNode *TBAAInfo,
562 bool ConvertTypeToTag) {
563 if (ConvertTypeToTag && TBAA)
564 Inst->setMetadata(llvm::LLVMContext::MD_tbaa,
565 TBAA->getTBAAScalarTagInfo(TBAAInfo));
567 Inst->setMetadata(llvm::LLVMContext::MD_tbaa, TBAAInfo);
570 void CodeGenModule::DecorateInstructionWithInvariantGroup(
571 llvm::Instruction *I, const CXXRecordDecl *RD) {
572 I->setMetadata(llvm::LLVMContext::MD_invariant_group,
573 llvm::MDNode::get(getLLVMContext(), {}));
576 void CodeGenModule::Error(SourceLocation loc, StringRef message) {
577 unsigned diagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error, "%0");
578 getDiags().Report(Context.getFullLoc(loc), diagID) << message;
581 /// ErrorUnsupported - Print out an error that codegen doesn't support the
582 /// specified stmt yet.
583 void CodeGenModule::ErrorUnsupported(const Stmt *S, const char *Type) {
584 unsigned DiagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error,
585 "cannot compile this %0 yet");
586 std::string Msg = Type;
587 getDiags().Report(Context.getFullLoc(S->getLocStart()), DiagID)
588 << Msg << S->getSourceRange();
591 /// ErrorUnsupported - Print out an error that codegen doesn't support the
592 /// specified decl yet.
593 void CodeGenModule::ErrorUnsupported(const Decl *D, const char *Type) {
594 unsigned DiagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error,
595 "cannot compile this %0 yet");
596 std::string Msg = Type;
597 getDiags().Report(Context.getFullLoc(D->getLocation()), DiagID) << Msg;
600 llvm::ConstantInt *CodeGenModule::getSize(CharUnits size) {
601 return llvm::ConstantInt::get(SizeTy, size.getQuantity());
604 void CodeGenModule::setGlobalVisibility(llvm::GlobalValue *GV,
605 const NamedDecl *D) const {
606 // Internal definitions always have default visibility.
607 if (GV->hasLocalLinkage()) {
608 GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
612 // Set visibility for definitions.
613 LinkageInfo LV = D->getLinkageAndVisibility();
614 if (LV.isVisibilityExplicit() || !GV->hasAvailableExternallyLinkage())
615 GV->setVisibility(GetLLVMVisibility(LV.getVisibility()));
618 static llvm::GlobalVariable::ThreadLocalMode GetLLVMTLSModel(StringRef S) {
619 return llvm::StringSwitch<llvm::GlobalVariable::ThreadLocalMode>(S)
620 .Case("global-dynamic", llvm::GlobalVariable::GeneralDynamicTLSModel)
621 .Case("local-dynamic", llvm::GlobalVariable::LocalDynamicTLSModel)
622 .Case("initial-exec", llvm::GlobalVariable::InitialExecTLSModel)
623 .Case("local-exec", llvm::GlobalVariable::LocalExecTLSModel);
626 static llvm::GlobalVariable::ThreadLocalMode GetLLVMTLSModel(
627 CodeGenOptions::TLSModel M) {
629 case CodeGenOptions::GeneralDynamicTLSModel:
630 return llvm::GlobalVariable::GeneralDynamicTLSModel;
631 case CodeGenOptions::LocalDynamicTLSModel:
632 return llvm::GlobalVariable::LocalDynamicTLSModel;
633 case CodeGenOptions::InitialExecTLSModel:
634 return llvm::GlobalVariable::InitialExecTLSModel;
635 case CodeGenOptions::LocalExecTLSModel:
636 return llvm::GlobalVariable::LocalExecTLSModel;
638 llvm_unreachable("Invalid TLS model!");
641 void CodeGenModule::setTLSMode(llvm::GlobalValue *GV, const VarDecl &D) const {
642 assert(D.getTLSKind() && "setting TLS mode on non-TLS var!");
644 llvm::GlobalValue::ThreadLocalMode TLM;
645 TLM = GetLLVMTLSModel(CodeGenOpts.getDefaultTLSModel());
647 // Override the TLS model if it is explicitly specified.
648 if (const TLSModelAttr *Attr = D.getAttr<TLSModelAttr>()) {
649 TLM = GetLLVMTLSModel(Attr->getModel());
652 GV->setThreadLocalMode(TLM);
655 StringRef CodeGenModule::getMangledName(GlobalDecl GD) {
656 GlobalDecl CanonicalGD = GD.getCanonicalDecl();
658 // Some ABIs don't have constructor variants. Make sure that base and
659 // complete constructors get mangled the same.
660 if (const auto *CD = dyn_cast<CXXConstructorDecl>(CanonicalGD.getDecl())) {
661 if (!getTarget().getCXXABI().hasConstructorVariants()) {
662 CXXCtorType OrigCtorType = GD.getCtorType();
663 assert(OrigCtorType == Ctor_Base || OrigCtorType == Ctor_Complete);
664 if (OrigCtorType == Ctor_Base)
665 CanonicalGD = GlobalDecl(CD, Ctor_Complete);
669 StringRef &FoundStr = MangledDeclNames[CanonicalGD];
670 if (!FoundStr.empty())
673 const auto *ND = cast<NamedDecl>(GD.getDecl());
674 SmallString<256> Buffer;
676 if (getCXXABI().getMangleContext().shouldMangleDeclName(ND)) {
677 llvm::raw_svector_ostream Out(Buffer);
678 if (const auto *D = dyn_cast<CXXConstructorDecl>(ND))
679 getCXXABI().getMangleContext().mangleCXXCtor(D, GD.getCtorType(), Out);
680 else if (const auto *D = dyn_cast<CXXDestructorDecl>(ND))
681 getCXXABI().getMangleContext().mangleCXXDtor(D, GD.getDtorType(), Out);
683 getCXXABI().getMangleContext().mangleName(ND, Out);
686 IdentifierInfo *II = ND->getIdentifier();
687 assert(II && "Attempt to mangle unnamed decl.");
688 const auto *FD = dyn_cast<FunctionDecl>(ND);
691 FD->getType()->castAs<FunctionType>()->getCallConv() == CC_X86RegCall) {
692 llvm::raw_svector_ostream Out(Buffer);
693 Out << "__regcall3__" << II->getName();
700 // Keep the first result in the case of a mangling collision.
701 auto Result = Manglings.insert(std::make_pair(Str, GD));
702 return FoundStr = Result.first->first();
705 StringRef CodeGenModule::getBlockMangledName(GlobalDecl GD,
706 const BlockDecl *BD) {
707 MangleContext &MangleCtx = getCXXABI().getMangleContext();
708 const Decl *D = GD.getDecl();
710 SmallString<256> Buffer;
711 llvm::raw_svector_ostream Out(Buffer);
713 MangleCtx.mangleGlobalBlock(BD,
714 dyn_cast_or_null<VarDecl>(initializedGlobalDecl.getDecl()), Out);
715 else if (const auto *CD = dyn_cast<CXXConstructorDecl>(D))
716 MangleCtx.mangleCtorBlock(CD, GD.getCtorType(), BD, Out);
717 else if (const auto *DD = dyn_cast<CXXDestructorDecl>(D))
718 MangleCtx.mangleDtorBlock(DD, GD.getDtorType(), BD, Out);
720 MangleCtx.mangleBlock(cast<DeclContext>(D), BD, Out);
722 auto Result = Manglings.insert(std::make_pair(Out.str(), BD));
723 return Result.first->first();
726 llvm::GlobalValue *CodeGenModule::GetGlobalValue(StringRef Name) {
727 return getModule().getNamedValue(Name);
730 /// AddGlobalCtor - Add a function to the list that will be called before
732 void CodeGenModule::AddGlobalCtor(llvm::Function *Ctor, int Priority,
733 llvm::Constant *AssociatedData) {
734 // FIXME: Type coercion of void()* types.
735 GlobalCtors.push_back(Structor(Priority, Ctor, AssociatedData));
738 /// AddGlobalDtor - Add a function to the list that will be called
739 /// when the module is unloaded.
740 void CodeGenModule::AddGlobalDtor(llvm::Function *Dtor, int Priority) {
741 // FIXME: Type coercion of void()* types.
742 GlobalDtors.push_back(Structor(Priority, Dtor, nullptr));
745 void CodeGenModule::EmitCtorList(CtorList &Fns, const char *GlobalName) {
746 if (Fns.empty()) return;
748 // Ctor function type is void()*.
749 llvm::FunctionType* CtorFTy = llvm::FunctionType::get(VoidTy, false);
750 llvm::Type *CtorPFTy = llvm::PointerType::getUnqual(CtorFTy);
752 // Get the type of a ctor entry, { i32, void ()*, i8* }.
753 llvm::StructType *CtorStructTy = llvm::StructType::get(
754 Int32Ty, llvm::PointerType::getUnqual(CtorFTy), VoidPtrTy, nullptr);
756 // Construct the constructor and destructor arrays.
757 ConstantInitBuilder builder(*this);
758 auto ctors = builder.beginArray(CtorStructTy);
759 for (const auto &I : Fns) {
760 auto ctor = ctors.beginStruct(CtorStructTy);
761 ctor.addInt(Int32Ty, I.Priority);
762 ctor.add(llvm::ConstantExpr::getBitCast(I.Initializer, CtorPFTy));
763 if (I.AssociatedData)
764 ctor.add(llvm::ConstantExpr::getBitCast(I.AssociatedData, VoidPtrTy));
766 ctor.addNullPointer(VoidPtrTy);
767 ctor.finishAndAddTo(ctors);
771 ctors.finishAndCreateGlobal(GlobalName, getPointerAlign(),
773 llvm::GlobalValue::AppendingLinkage);
775 // The LTO linker doesn't seem to like it when we set an alignment
776 // on appending variables. Take it off as a workaround.
777 list->setAlignment(0);
782 llvm::GlobalValue::LinkageTypes
783 CodeGenModule::getFunctionLinkage(GlobalDecl GD) {
784 const auto *D = cast<FunctionDecl>(GD.getDecl());
786 GVALinkage Linkage = getContext().GetGVALinkageForFunction(D);
788 if (isa<CXXDestructorDecl>(D) &&
789 getCXXABI().useThunkForDtorVariant(cast<CXXDestructorDecl>(D),
791 // Destructor variants in the Microsoft C++ ABI are always internal or
792 // linkonce_odr thunks emitted on an as-needed basis.
793 return Linkage == GVA_Internal ? llvm::GlobalValue::InternalLinkage
794 : llvm::GlobalValue::LinkOnceODRLinkage;
797 if (isa<CXXConstructorDecl>(D) &&
798 cast<CXXConstructorDecl>(D)->isInheritingConstructor() &&
799 Context.getTargetInfo().getCXXABI().isMicrosoft()) {
800 // Our approach to inheriting constructors is fundamentally different from
801 // that used by the MS ABI, so keep our inheriting constructor thunks
802 // internal rather than trying to pick an unambiguous mangling for them.
803 return llvm::GlobalValue::InternalLinkage;
806 return getLLVMLinkageForDeclarator(D, Linkage, /*isConstantVariable=*/false);
809 void CodeGenModule::setFunctionDLLStorageClass(GlobalDecl GD, llvm::Function *F) {
810 const auto *FD = cast<FunctionDecl>(GD.getDecl());
812 if (const auto *Dtor = dyn_cast_or_null<CXXDestructorDecl>(FD)) {
813 if (getCXXABI().useThunkForDtorVariant(Dtor, GD.getDtorType())) {
814 // Don't dllexport/import destructor thunks.
815 F->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
820 if (FD->hasAttr<DLLImportAttr>())
821 F->setDLLStorageClass(llvm::GlobalVariable::DLLImportStorageClass);
822 else if (FD->hasAttr<DLLExportAttr>())
823 F->setDLLStorageClass(llvm::GlobalVariable::DLLExportStorageClass);
825 F->setDLLStorageClass(llvm::GlobalVariable::DefaultStorageClass);
828 llvm::ConstantInt *CodeGenModule::CreateCrossDsoCfiTypeId(llvm::Metadata *MD) {
829 llvm::MDString *MDS = dyn_cast<llvm::MDString>(MD);
830 if (!MDS) return nullptr;
832 return llvm::ConstantInt::get(Int64Ty, llvm::MD5Hash(MDS->getString()));
835 void CodeGenModule::setFunctionDefinitionAttributes(const FunctionDecl *D,
837 setNonAliasAttributes(D, F);
840 void CodeGenModule::SetLLVMFunctionAttributes(const Decl *D,
841 const CGFunctionInfo &Info,
843 unsigned CallingConv;
844 llvm::AttributeList PAL;
845 ConstructAttributeList(F->getName(), Info, D, PAL, CallingConv, false);
846 F->setAttributes(PAL);
847 F->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv));
850 /// Determines whether the language options require us to model
851 /// unwind exceptions. We treat -fexceptions as mandating this
852 /// except under the fragile ObjC ABI with only ObjC exceptions
853 /// enabled. This means, for example, that C with -fexceptions
855 static bool hasUnwindExceptions(const LangOptions &LangOpts) {
856 // If exceptions are completely disabled, obviously this is false.
857 if (!LangOpts.Exceptions) return false;
859 // If C++ exceptions are enabled, this is true.
860 if (LangOpts.CXXExceptions) return true;
862 // If ObjC exceptions are enabled, this depends on the ABI.
863 if (LangOpts.ObjCExceptions) {
864 return LangOpts.ObjCRuntime.hasUnwindExceptions();
870 void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D,
874 if (CodeGenOpts.UnwindTables)
875 B.addAttribute(llvm::Attribute::UWTable);
877 if (!hasUnwindExceptions(LangOpts))
878 B.addAttribute(llvm::Attribute::NoUnwind);
880 if (LangOpts.getStackProtector() == LangOptions::SSPOn)
881 B.addAttribute(llvm::Attribute::StackProtect);
882 else if (LangOpts.getStackProtector() == LangOptions::SSPStrong)
883 B.addAttribute(llvm::Attribute::StackProtectStrong);
884 else if (LangOpts.getStackProtector() == LangOptions::SSPReq)
885 B.addAttribute(llvm::Attribute::StackProtectReq);
888 // If we don't have a declaration to control inlining, the function isn't
889 // explicitly marked as alwaysinline for semantic reasons, and inlining is
890 // disabled, mark the function as noinline.
891 if (!F->hasFnAttribute(llvm::Attribute::AlwaysInline) &&
892 CodeGenOpts.getInlining() == CodeGenOptions::OnlyAlwaysInlining)
893 B.addAttribute(llvm::Attribute::NoInline);
895 F->addAttributes(llvm::AttributeList::FunctionIndex, B);
899 if (D->hasAttr<OptimizeNoneAttr>()) {
900 B.addAttribute(llvm::Attribute::OptimizeNone);
902 // OptimizeNone implies noinline; we should not be inlining such functions.
903 B.addAttribute(llvm::Attribute::NoInline);
904 assert(!F->hasFnAttribute(llvm::Attribute::AlwaysInline) &&
905 "OptimizeNone and AlwaysInline on same function!");
907 // We still need to handle naked functions even though optnone subsumes
908 // much of their semantics.
909 if (D->hasAttr<NakedAttr>())
910 B.addAttribute(llvm::Attribute::Naked);
912 // OptimizeNone wins over OptimizeForSize and MinSize.
913 F->removeFnAttr(llvm::Attribute::OptimizeForSize);
914 F->removeFnAttr(llvm::Attribute::MinSize);
915 } else if (D->hasAttr<NakedAttr>()) {
916 // Naked implies noinline: we should not be inlining such functions.
917 B.addAttribute(llvm::Attribute::Naked);
918 B.addAttribute(llvm::Attribute::NoInline);
919 } else if (D->hasAttr<NoDuplicateAttr>()) {
920 B.addAttribute(llvm::Attribute::NoDuplicate);
921 } else if (D->hasAttr<NoInlineAttr>()) {
922 B.addAttribute(llvm::Attribute::NoInline);
923 } else if (D->hasAttr<AlwaysInlineAttr>() &&
924 !F->hasFnAttribute(llvm::Attribute::NoInline)) {
925 // (noinline wins over always_inline, and we can't specify both in IR)
926 B.addAttribute(llvm::Attribute::AlwaysInline);
927 } else if (CodeGenOpts.getInlining() == CodeGenOptions::OnlyAlwaysInlining) {
928 // If we're not inlining, then force everything that isn't always_inline to
929 // carry an explicit noinline attribute.
930 if (!F->hasFnAttribute(llvm::Attribute::AlwaysInline))
931 B.addAttribute(llvm::Attribute::NoInline);
933 // Otherwise, propagate the inline hint attribute and potentially use its
934 // absence to mark things as noinline.
935 if (auto *FD = dyn_cast<FunctionDecl>(D)) {
936 if (any_of(FD->redecls(), [&](const FunctionDecl *Redecl) {
937 return Redecl->isInlineSpecified();
939 B.addAttribute(llvm::Attribute::InlineHint);
940 } else if (CodeGenOpts.getInlining() ==
941 CodeGenOptions::OnlyHintInlining &&
943 !F->hasFnAttribute(llvm::Attribute::AlwaysInline)) {
944 B.addAttribute(llvm::Attribute::NoInline);
949 // Add other optimization related attributes if we are optimizing this
951 if (!D->hasAttr<OptimizeNoneAttr>()) {
952 if (D->hasAttr<ColdAttr>()) {
953 B.addAttribute(llvm::Attribute::OptimizeForSize);
954 B.addAttribute(llvm::Attribute::Cold);
957 if (D->hasAttr<MinSizeAttr>())
958 B.addAttribute(llvm::Attribute::MinSize);
961 F->addAttributes(llvm::AttributeList::FunctionIndex, B);
963 unsigned alignment = D->getMaxAlignment() / Context.getCharWidth();
965 F->setAlignment(alignment);
967 // Some C++ ABIs require 2-byte alignment for member functions, in order to
968 // reserve a bit for differentiating between virtual and non-virtual member
969 // functions. If the current target's C++ ABI requires this and this is a
970 // member function, set its alignment accordingly.
971 if (getTarget().getCXXABI().areMemberFunctionsAligned()) {
972 if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D))
976 // In the cross-dso CFI mode, we want !type attributes on definitions only.
977 if (CodeGenOpts.SanitizeCfiCrossDso)
978 if (auto *FD = dyn_cast<FunctionDecl>(D))
979 CreateFunctionTypeMetadata(FD, F);
982 void CodeGenModule::SetCommonAttributes(const Decl *D,
983 llvm::GlobalValue *GV) {
984 if (const auto *ND = dyn_cast_or_null<NamedDecl>(D))
985 setGlobalVisibility(GV, ND);
987 GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
989 if (D && D->hasAttr<UsedAttr>())
993 void CodeGenModule::setAliasAttributes(const Decl *D,
994 llvm::GlobalValue *GV) {
995 SetCommonAttributes(D, GV);
997 // Process the dllexport attribute based on whether the original definition
998 // (not necessarily the aliasee) was exported.
999 if (D->hasAttr<DLLExportAttr>())
1000 GV->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
1003 void CodeGenModule::setNonAliasAttributes(const Decl *D,
1004 llvm::GlobalObject *GO) {
1005 SetCommonAttributes(D, GO);
1008 if (const SectionAttr *SA = D->getAttr<SectionAttr>())
1009 GO->setSection(SA->getName());
1011 getTargetCodeGenInfo().setTargetAttributes(D, GO, *this);
1014 void CodeGenModule::SetInternalFunctionAttributes(const Decl *D,
1016 const CGFunctionInfo &FI) {
1017 SetLLVMFunctionAttributes(D, FI, F);
1018 SetLLVMFunctionAttributesForDefinition(D, F);
1020 F->setLinkage(llvm::Function::InternalLinkage);
1022 setNonAliasAttributes(D, F);
1025 static void setLinkageAndVisibilityForGV(llvm::GlobalValue *GV,
1026 const NamedDecl *ND) {
1027 // Set linkage and visibility in case we never see a definition.
1028 LinkageInfo LV = ND->getLinkageAndVisibility();
1029 if (LV.getLinkage() != ExternalLinkage) {
1030 // Don't set internal linkage on declarations.
1032 if (ND->hasAttr<DLLImportAttr>()) {
1033 GV->setLinkage(llvm::GlobalValue::ExternalLinkage);
1034 GV->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
1035 } else if (ND->hasAttr<DLLExportAttr>()) {
1036 GV->setLinkage(llvm::GlobalValue::ExternalLinkage);
1037 } else if (ND->hasAttr<WeakAttr>() || ND->isWeakImported()) {
1038 // "extern_weak" is overloaded in LLVM; we probably should have
1039 // separate linkage types for this.
1040 GV->setLinkage(llvm::GlobalValue::ExternalWeakLinkage);
1043 // Set visibility on a declaration only if it's explicit.
1044 if (LV.isVisibilityExplicit())
1045 GV->setVisibility(CodeGenModule::GetLLVMVisibility(LV.getVisibility()));
1049 void CodeGenModule::CreateFunctionTypeMetadata(const FunctionDecl *FD,
1050 llvm::Function *F) {
1051 // Only if we are checking indirect calls.
1052 if (!LangOpts.Sanitize.has(SanitizerKind::CFIICall))
1055 // Non-static class methods are handled via vtable pointer checks elsewhere.
1056 if (isa<CXXMethodDecl>(FD) && !cast<CXXMethodDecl>(FD)->isStatic())
1059 // Additionally, if building with cross-DSO support...
1060 if (CodeGenOpts.SanitizeCfiCrossDso) {
1061 // Skip available_externally functions. They won't be codegen'ed in the
1062 // current module anyway.
1063 if (getContext().GetGVALinkageForFunction(FD) == GVA_AvailableExternally)
1067 llvm::Metadata *MD = CreateMetadataIdentifierForType(FD->getType());
1068 F->addTypeMetadata(0, MD);
1070 // Emit a hash-based bit set entry for cross-DSO calls.
1071 if (CodeGenOpts.SanitizeCfiCrossDso)
1072 if (auto CrossDsoTypeId = CreateCrossDsoCfiTypeId(MD))
1073 F->addTypeMetadata(0, llvm::ConstantAsMetadata::get(CrossDsoTypeId));
1076 void CodeGenModule::SetFunctionAttributes(GlobalDecl GD, llvm::Function *F,
1077 bool IsIncompleteFunction,
1079 if (llvm::Intrinsic::ID IID = F->getIntrinsicID()) {
1080 // If this is an intrinsic function, set the function's attributes
1081 // to the intrinsic's attributes.
1082 F->setAttributes(llvm::Intrinsic::getAttributes(getLLVMContext(), IID));
1086 const auto *FD = cast<FunctionDecl>(GD.getDecl());
1088 if (!IsIncompleteFunction)
1089 SetLLVMFunctionAttributes(FD, getTypes().arrangeGlobalDeclaration(GD), F);
1091 // Add the Returned attribute for "this", except for iOS 5 and earlier
1092 // where substantial code, including the libstdc++ dylib, was compiled with
1093 // GCC and does not actually return "this".
1094 if (!IsThunk && getCXXABI().HasThisReturn(GD) &&
1095 !(getTriple().isiOS() && getTriple().isOSVersionLT(6))) {
1096 assert(!F->arg_empty() &&
1097 F->arg_begin()->getType()
1098 ->canLosslesslyBitCastTo(F->getReturnType()) &&
1099 "unexpected this return");
1100 F->addAttribute(1, llvm::Attribute::Returned);
1103 // Only a few attributes are set on declarations; these may later be
1104 // overridden by a definition.
1106 setLinkageAndVisibilityForGV(F, FD);
1108 if (const SectionAttr *SA = FD->getAttr<SectionAttr>())
1109 F->setSection(SA->getName());
1111 if (FD->isReplaceableGlobalAllocationFunction()) {
1112 // A replaceable global allocation function does not act like a builtin by
1113 // default, only if it is invoked by a new-expression or delete-expression.
1114 F->addAttribute(llvm::AttributeList::FunctionIndex,
1115 llvm::Attribute::NoBuiltin);
1117 // A sane operator new returns a non-aliasing pointer.
1118 // FIXME: Also add NonNull attribute to the return value
1119 // for the non-nothrow forms?
1120 auto Kind = FD->getDeclName().getCXXOverloadedOperator();
1121 if (getCodeGenOpts().AssumeSaneOperatorNew &&
1122 (Kind == OO_New || Kind == OO_Array_New))
1123 F->addAttribute(llvm::AttributeList::ReturnIndex,
1124 llvm::Attribute::NoAlias);
1127 if (isa<CXXConstructorDecl>(FD) || isa<CXXDestructorDecl>(FD))
1128 F->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1129 else if (const auto *MD = dyn_cast<CXXMethodDecl>(FD))
1130 if (MD->isVirtual())
1131 F->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1133 // Don't emit entries for function declarations in the cross-DSO mode. This
1134 // is handled with better precision by the receiving DSO.
1135 if (!CodeGenOpts.SanitizeCfiCrossDso)
1136 CreateFunctionTypeMetadata(FD, F);
1139 void CodeGenModule::addUsedGlobal(llvm::GlobalValue *GV) {
1140 assert(!GV->isDeclaration() &&
1141 "Only globals with definition can force usage.");
1142 LLVMUsed.emplace_back(GV);
1145 void CodeGenModule::addCompilerUsedGlobal(llvm::GlobalValue *GV) {
1146 assert(!GV->isDeclaration() &&
1147 "Only globals with definition can force usage.");
1148 LLVMCompilerUsed.emplace_back(GV);
1151 static void emitUsed(CodeGenModule &CGM, StringRef Name,
1152 std::vector<llvm::WeakTrackingVH> &List) {
1153 // Don't create llvm.used if there is no need.
1157 // Convert List to what ConstantArray needs.
1158 SmallVector<llvm::Constant*, 8> UsedArray;
1159 UsedArray.resize(List.size());
1160 for (unsigned i = 0, e = List.size(); i != e; ++i) {
1162 llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(
1163 cast<llvm::Constant>(&*List[i]), CGM.Int8PtrTy);
1166 if (UsedArray.empty())
1168 llvm::ArrayType *ATy = llvm::ArrayType::get(CGM.Int8PtrTy, UsedArray.size());
1170 auto *GV = new llvm::GlobalVariable(
1171 CGM.getModule(), ATy, false, llvm::GlobalValue::AppendingLinkage,
1172 llvm::ConstantArray::get(ATy, UsedArray), Name);
1174 GV->setSection("llvm.metadata");
1177 void CodeGenModule::emitLLVMUsed() {
1178 emitUsed(*this, "llvm.used", LLVMUsed);
1179 emitUsed(*this, "llvm.compiler.used", LLVMCompilerUsed);
1182 void CodeGenModule::AppendLinkerOptions(StringRef Opts) {
1183 auto *MDOpts = llvm::MDString::get(getLLVMContext(), Opts);
1184 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
1187 void CodeGenModule::AddDetectMismatch(StringRef Name, StringRef Value) {
1188 llvm::SmallString<32> Opt;
1189 getTargetCodeGenInfo().getDetectMismatchOption(Name, Value, Opt);
1190 auto *MDOpts = llvm::MDString::get(getLLVMContext(), Opt);
1191 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
1194 void CodeGenModule::AddDependentLib(StringRef Lib) {
1195 llvm::SmallString<24> Opt;
1196 getTargetCodeGenInfo().getDependentLibraryOption(Lib, Opt);
1197 auto *MDOpts = llvm::MDString::get(getLLVMContext(), Opt);
1198 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
1201 /// \brief Add link options implied by the given module, including modules
1202 /// it depends on, using a postorder walk.
1203 static void addLinkOptionsPostorder(CodeGenModule &CGM, Module *Mod,
1204 SmallVectorImpl<llvm::Metadata *> &Metadata,
1205 llvm::SmallPtrSet<Module *, 16> &Visited) {
1206 // Import this module's parent.
1207 if (Mod->Parent && Visited.insert(Mod->Parent).second) {
1208 addLinkOptionsPostorder(CGM, Mod->Parent, Metadata, Visited);
1211 // Import this module's dependencies.
1212 for (unsigned I = Mod->Imports.size(); I > 0; --I) {
1213 if (Visited.insert(Mod->Imports[I - 1]).second)
1214 addLinkOptionsPostorder(CGM, Mod->Imports[I-1], Metadata, Visited);
1217 // Add linker options to link against the libraries/frameworks
1218 // described by this module.
1219 llvm::LLVMContext &Context = CGM.getLLVMContext();
1220 for (unsigned I = Mod->LinkLibraries.size(); I > 0; --I) {
1221 // Link against a framework. Frameworks are currently Darwin only, so we
1222 // don't to ask TargetCodeGenInfo for the spelling of the linker option.
1223 if (Mod->LinkLibraries[I-1].IsFramework) {
1224 llvm::Metadata *Args[2] = {
1225 llvm::MDString::get(Context, "-framework"),
1226 llvm::MDString::get(Context, Mod->LinkLibraries[I - 1].Library)};
1228 Metadata.push_back(llvm::MDNode::get(Context, Args));
1232 // Link against a library.
1233 llvm::SmallString<24> Opt;
1234 CGM.getTargetCodeGenInfo().getDependentLibraryOption(
1235 Mod->LinkLibraries[I-1].Library, Opt);
1236 auto *OptString = llvm::MDString::get(Context, Opt);
1237 Metadata.push_back(llvm::MDNode::get(Context, OptString));
1241 void CodeGenModule::EmitModuleLinkOptions() {
1242 // Collect the set of all of the modules we want to visit to emit link
1243 // options, which is essentially the imported modules and all of their
1244 // non-explicit child modules.
1245 llvm::SetVector<clang::Module *> LinkModules;
1246 llvm::SmallPtrSet<clang::Module *, 16> Visited;
1247 SmallVector<clang::Module *, 16> Stack;
1249 // Seed the stack with imported modules.
1250 for (Module *M : ImportedModules) {
1251 // Do not add any link flags when an implementation TU of a module imports
1252 // a header of that same module.
1253 if (M->getTopLevelModuleName() == getLangOpts().CurrentModule &&
1254 !getLangOpts().isCompilingModule())
1256 if (Visited.insert(M).second)
1260 // Find all of the modules to import, making a little effort to prune
1261 // non-leaf modules.
1262 while (!Stack.empty()) {
1263 clang::Module *Mod = Stack.pop_back_val();
1265 bool AnyChildren = false;
1267 // Visit the submodules of this module.
1268 for (clang::Module::submodule_iterator Sub = Mod->submodule_begin(),
1269 SubEnd = Mod->submodule_end();
1270 Sub != SubEnd; ++Sub) {
1271 // Skip explicit children; they need to be explicitly imported to be
1273 if ((*Sub)->IsExplicit)
1276 if (Visited.insert(*Sub).second) {
1277 Stack.push_back(*Sub);
1282 // We didn't find any children, so add this module to the list of
1283 // modules to link against.
1285 LinkModules.insert(Mod);
1289 // Add link options for all of the imported modules in reverse topological
1290 // order. We don't do anything to try to order import link flags with respect
1291 // to linker options inserted by things like #pragma comment().
1292 SmallVector<llvm::Metadata *, 16> MetadataArgs;
1294 for (Module *M : LinkModules)
1295 if (Visited.insert(M).second)
1296 addLinkOptionsPostorder(*this, M, MetadataArgs, Visited);
1297 std::reverse(MetadataArgs.begin(), MetadataArgs.end());
1298 LinkerOptionsMetadata.append(MetadataArgs.begin(), MetadataArgs.end());
1300 // Add the linker options metadata flag.
1301 getModule().addModuleFlag(llvm::Module::AppendUnique, "Linker Options",
1302 llvm::MDNode::get(getLLVMContext(),
1303 LinkerOptionsMetadata));
1306 void CodeGenModule::EmitDeferred() {
1307 // Emit code for any potentially referenced deferred decls. Since a
1308 // previously unused static decl may become used during the generation of code
1309 // for a static function, iterate until no changes are made.
1311 if (!DeferredVTables.empty()) {
1312 EmitDeferredVTables();
1314 // Emitting a vtable doesn't directly cause more vtables to
1315 // become deferred, although it can cause functions to be
1316 // emitted that then need those vtables.
1317 assert(DeferredVTables.empty());
1320 // Stop if we're out of both deferred vtables and deferred declarations.
1321 if (DeferredDeclsToEmit.empty())
1324 // Grab the list of decls to emit. If EmitGlobalDefinition schedules more
1325 // work, it will not interfere with this.
1326 std::vector<GlobalDecl> CurDeclsToEmit;
1327 CurDeclsToEmit.swap(DeferredDeclsToEmit);
1329 for (GlobalDecl &D : CurDeclsToEmit) {
1330 // We should call GetAddrOfGlobal with IsForDefinition set to true in order
1331 // to get GlobalValue with exactly the type we need, not something that
1332 // might had been created for another decl with the same mangled name but
1334 llvm::GlobalValue *GV = dyn_cast<llvm::GlobalValue>(
1335 GetAddrOfGlobal(D, ForDefinition));
1337 // In case of different address spaces, we may still get a cast, even with
1338 // IsForDefinition equal to true. Query mangled names table to get
1341 GV = GetGlobalValue(getMangledName(D));
1343 // Make sure GetGlobalValue returned non-null.
1346 // Check to see if we've already emitted this. This is necessary
1347 // for a couple of reasons: first, decls can end up in the
1348 // deferred-decls queue multiple times, and second, decls can end
1349 // up with definitions in unusual ways (e.g. by an extern inline
1350 // function acquiring a strong function redefinition). Just
1351 // ignore these cases.
1352 if (!GV->isDeclaration())
1355 // Otherwise, emit the definition and move on to the next one.
1356 EmitGlobalDefinition(D, GV);
1358 // If we found out that we need to emit more decls, do that recursively.
1359 // This has the advantage that the decls are emitted in a DFS and related
1360 // ones are close together, which is convenient for testing.
1361 if (!DeferredVTables.empty() || !DeferredDeclsToEmit.empty()) {
1363 assert(DeferredVTables.empty() && DeferredDeclsToEmit.empty());
1368 void CodeGenModule::EmitGlobalAnnotations() {
1369 if (Annotations.empty())
1372 // Create a new global variable for the ConstantStruct in the Module.
1373 llvm::Constant *Array = llvm::ConstantArray::get(llvm::ArrayType::get(
1374 Annotations[0]->getType(), Annotations.size()), Annotations);
1375 auto *gv = new llvm::GlobalVariable(getModule(), Array->getType(), false,
1376 llvm::GlobalValue::AppendingLinkage,
1377 Array, "llvm.global.annotations");
1378 gv->setSection(AnnotationSection);
1381 llvm::Constant *CodeGenModule::EmitAnnotationString(StringRef Str) {
1382 llvm::Constant *&AStr = AnnotationStrings[Str];
1386 // Not found yet, create a new global.
1387 llvm::Constant *s = llvm::ConstantDataArray::getString(getLLVMContext(), Str);
1389 new llvm::GlobalVariable(getModule(), s->getType(), true,
1390 llvm::GlobalValue::PrivateLinkage, s, ".str");
1391 gv->setSection(AnnotationSection);
1392 gv->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1397 llvm::Constant *CodeGenModule::EmitAnnotationUnit(SourceLocation Loc) {
1398 SourceManager &SM = getContext().getSourceManager();
1399 PresumedLoc PLoc = SM.getPresumedLoc(Loc);
1401 return EmitAnnotationString(PLoc.getFilename());
1402 return EmitAnnotationString(SM.getBufferName(Loc));
1405 llvm::Constant *CodeGenModule::EmitAnnotationLineNo(SourceLocation L) {
1406 SourceManager &SM = getContext().getSourceManager();
1407 PresumedLoc PLoc = SM.getPresumedLoc(L);
1408 unsigned LineNo = PLoc.isValid() ? PLoc.getLine() :
1409 SM.getExpansionLineNumber(L);
1410 return llvm::ConstantInt::get(Int32Ty, LineNo);
1413 llvm::Constant *CodeGenModule::EmitAnnotateAttr(llvm::GlobalValue *GV,
1414 const AnnotateAttr *AA,
1416 // Get the globals for file name, annotation, and the line number.
1417 llvm::Constant *AnnoGV = EmitAnnotationString(AA->getAnnotation()),
1418 *UnitGV = EmitAnnotationUnit(L),
1419 *LineNoCst = EmitAnnotationLineNo(L);
1421 // Create the ConstantStruct for the global annotation.
1422 llvm::Constant *Fields[4] = {
1423 llvm::ConstantExpr::getBitCast(GV, Int8PtrTy),
1424 llvm::ConstantExpr::getBitCast(AnnoGV, Int8PtrTy),
1425 llvm::ConstantExpr::getBitCast(UnitGV, Int8PtrTy),
1428 return llvm::ConstantStruct::getAnon(Fields);
1431 void CodeGenModule::AddGlobalAnnotations(const ValueDecl *D,
1432 llvm::GlobalValue *GV) {
1433 assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute");
1434 // Get the struct elements for these annotations.
1435 for (const auto *I : D->specific_attrs<AnnotateAttr>())
1436 Annotations.push_back(EmitAnnotateAttr(GV, I, D->getLocation()));
1439 bool CodeGenModule::isInSanitizerBlacklist(llvm::Function *Fn,
1440 SourceLocation Loc) const {
1441 const auto &SanitizerBL = getContext().getSanitizerBlacklist();
1442 // Blacklist by function name.
1443 if (SanitizerBL.isBlacklistedFunction(Fn->getName()))
1445 // Blacklist by location.
1447 return SanitizerBL.isBlacklistedLocation(Loc);
1448 // If location is unknown, this may be a compiler-generated function. Assume
1449 // it's located in the main file.
1450 auto &SM = Context.getSourceManager();
1451 if (const auto *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
1452 return SanitizerBL.isBlacklistedFile(MainFile->getName());
1457 bool CodeGenModule::isInSanitizerBlacklist(llvm::GlobalVariable *GV,
1458 SourceLocation Loc, QualType Ty,
1459 StringRef Category) const {
1460 // For now globals can be blacklisted only in ASan and KASan.
1461 if (!LangOpts.Sanitize.hasOneOf(
1462 SanitizerKind::Address | SanitizerKind::KernelAddress))
1464 const auto &SanitizerBL = getContext().getSanitizerBlacklist();
1465 if (SanitizerBL.isBlacklistedGlobal(GV->getName(), Category))
1467 if (SanitizerBL.isBlacklistedLocation(Loc, Category))
1469 // Check global type.
1471 // Drill down the array types: if global variable of a fixed type is
1472 // blacklisted, we also don't instrument arrays of them.
1473 while (auto AT = dyn_cast<ArrayType>(Ty.getTypePtr()))
1474 Ty = AT->getElementType();
1475 Ty = Ty.getCanonicalType().getUnqualifiedType();
1476 // We allow to blacklist only record types (classes, structs etc.)
1477 if (Ty->isRecordType()) {
1478 std::string TypeStr = Ty.getAsString(getContext().getPrintingPolicy());
1479 if (SanitizerBL.isBlacklistedType(TypeStr, Category))
1486 bool CodeGenModule::imbueXRayAttrs(llvm::Function *Fn, SourceLocation Loc,
1487 StringRef Category) const {
1488 if (!LangOpts.XRayInstrument)
1490 const auto &XRayFilter = getContext().getXRayFilter();
1491 using ImbueAttr = XRayFunctionFilter::ImbueAttribute;
1492 auto Attr = XRayFunctionFilter::ImbueAttribute::NONE;
1494 Attr = XRayFilter.shouldImbueLocation(Loc, Category);
1495 if (Attr == ImbueAttr::NONE)
1496 Attr = XRayFilter.shouldImbueFunction(Fn->getName());
1498 case ImbueAttr::NONE:
1500 case ImbueAttr::ALWAYS:
1501 Fn->addFnAttr("function-instrument", "xray-always");
1503 case ImbueAttr::NEVER:
1504 Fn->addFnAttr("function-instrument", "xray-never");
1510 bool CodeGenModule::MustBeEmitted(const ValueDecl *Global) {
1511 // Never defer when EmitAllDecls is specified.
1512 if (LangOpts.EmitAllDecls)
1515 return getContext().DeclMustBeEmitted(Global);
1518 bool CodeGenModule::MayBeEmittedEagerly(const ValueDecl *Global) {
1519 if (const auto *FD = dyn_cast<FunctionDecl>(Global))
1520 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
1521 // Implicit template instantiations may change linkage if they are later
1522 // explicitly instantiated, so they should not be emitted eagerly.
1524 if (const auto *VD = dyn_cast<VarDecl>(Global))
1525 if (Context.getInlineVariableDefinitionKind(VD) ==
1526 ASTContext::InlineVariableDefinitionKind::WeakUnknown)
1527 // A definition of an inline constexpr static data member may change
1528 // linkage later if it's redeclared outside the class.
1530 // If OpenMP is enabled and threadprivates must be generated like TLS, delay
1531 // codegen for global variables, because they may be marked as threadprivate.
1532 if (LangOpts.OpenMP && LangOpts.OpenMPUseTLS &&
1533 getContext().getTargetInfo().isTLSSupported() && isa<VarDecl>(Global))
1539 ConstantAddress CodeGenModule::GetAddrOfUuidDescriptor(
1540 const CXXUuidofExpr* E) {
1541 // Sema has verified that IIDSource has a __declspec(uuid()), and that its
1543 StringRef Uuid = E->getUuidStr();
1544 std::string Name = "_GUID_" + Uuid.lower();
1545 std::replace(Name.begin(), Name.end(), '-', '_');
1547 // The UUID descriptor should be pointer aligned.
1548 CharUnits Alignment = CharUnits::fromQuantity(PointerAlignInBytes);
1550 // Look for an existing global.
1551 if (llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name))
1552 return ConstantAddress(GV, Alignment);
1554 llvm::Constant *Init = EmitUuidofInitializer(Uuid);
1555 assert(Init && "failed to initialize as constant");
1557 auto *GV = new llvm::GlobalVariable(
1558 getModule(), Init->getType(),
1559 /*isConstant=*/true, llvm::GlobalValue::LinkOnceODRLinkage, Init, Name);
1560 if (supportsCOMDAT())
1561 GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
1562 return ConstantAddress(GV, Alignment);
1565 ConstantAddress CodeGenModule::GetWeakRefReference(const ValueDecl *VD) {
1566 const AliasAttr *AA = VD->getAttr<AliasAttr>();
1567 assert(AA && "No alias?");
1569 CharUnits Alignment = getContext().getDeclAlign(VD);
1570 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(VD->getType());
1572 // See if there is already something with the target's name in the module.
1573 llvm::GlobalValue *Entry = GetGlobalValue(AA->getAliasee());
1575 unsigned AS = getContext().getTargetAddressSpace(VD->getType());
1576 auto Ptr = llvm::ConstantExpr::getBitCast(Entry, DeclTy->getPointerTo(AS));
1577 return ConstantAddress(Ptr, Alignment);
1580 llvm::Constant *Aliasee;
1581 if (isa<llvm::FunctionType>(DeclTy))
1582 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy,
1583 GlobalDecl(cast<FunctionDecl>(VD)),
1584 /*ForVTable=*/false);
1586 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
1587 llvm::PointerType::getUnqual(DeclTy),
1590 auto *F = cast<llvm::GlobalValue>(Aliasee);
1591 F->setLinkage(llvm::Function::ExternalWeakLinkage);
1592 WeakRefReferences.insert(F);
1594 return ConstantAddress(Aliasee, Alignment);
1597 void CodeGenModule::EmitGlobal(GlobalDecl GD) {
1598 const auto *Global = cast<ValueDecl>(GD.getDecl());
1600 // Weak references don't produce any output by themselves.
1601 if (Global->hasAttr<WeakRefAttr>())
1604 // If this is an alias definition (which otherwise looks like a declaration)
1606 if (Global->hasAttr<AliasAttr>())
1607 return EmitAliasDefinition(GD);
1609 // IFunc like an alias whose value is resolved at runtime by calling resolver.
1610 if (Global->hasAttr<IFuncAttr>())
1611 return emitIFuncDefinition(GD);
1613 // If this is CUDA, be selective about which declarations we emit.
1614 if (LangOpts.CUDA) {
1615 if (LangOpts.CUDAIsDevice) {
1616 if (!Global->hasAttr<CUDADeviceAttr>() &&
1617 !Global->hasAttr<CUDAGlobalAttr>() &&
1618 !Global->hasAttr<CUDAConstantAttr>() &&
1619 !Global->hasAttr<CUDASharedAttr>())
1622 // We need to emit host-side 'shadows' for all global
1623 // device-side variables because the CUDA runtime needs their
1624 // size and host-side address in order to provide access to
1625 // their device-side incarnations.
1627 // So device-only functions are the only things we skip.
1628 if (isa<FunctionDecl>(Global) && !Global->hasAttr<CUDAHostAttr>() &&
1629 Global->hasAttr<CUDADeviceAttr>())
1632 assert((isa<FunctionDecl>(Global) || isa<VarDecl>(Global)) &&
1633 "Expected Variable or Function");
1637 if (LangOpts.OpenMP) {
1638 // If this is OpenMP device, check if it is legal to emit this global
1640 if (OpenMPRuntime && OpenMPRuntime->emitTargetGlobal(GD))
1642 if (auto *DRD = dyn_cast<OMPDeclareReductionDecl>(Global)) {
1643 if (MustBeEmitted(Global))
1644 EmitOMPDeclareReduction(DRD);
1649 // Ignore declarations, they will be emitted on their first use.
1650 if (const auto *FD = dyn_cast<FunctionDecl>(Global)) {
1651 // Forward declarations are emitted lazily on first use.
1652 if (!FD->doesThisDeclarationHaveABody()) {
1653 if (!FD->doesDeclarationForceExternallyVisibleDefinition())
1656 StringRef MangledName = getMangledName(GD);
1658 // Compute the function info and LLVM type.
1659 const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
1660 llvm::Type *Ty = getTypes().GetFunctionType(FI);
1662 GetOrCreateLLVMFunction(MangledName, Ty, GD, /*ForVTable=*/false,
1663 /*DontDefer=*/false);
1667 const auto *VD = cast<VarDecl>(Global);
1668 assert(VD->isFileVarDecl() && "Cannot emit local var decl as global.");
1669 // We need to emit device-side global CUDA variables even if a
1670 // variable does not have a definition -- we still need to define
1671 // host-side shadow for it.
1672 bool MustEmitForCuda = LangOpts.CUDA && !LangOpts.CUDAIsDevice &&
1673 !VD->hasDefinition() &&
1674 (VD->hasAttr<CUDAConstantAttr>() ||
1675 VD->hasAttr<CUDADeviceAttr>());
1676 if (!MustEmitForCuda &&
1677 VD->isThisDeclarationADefinition() != VarDecl::Definition &&
1678 !Context.isMSStaticDataMemberInlineDefinition(VD)) {
1679 // If this declaration may have caused an inline variable definition to
1680 // change linkage, make sure that it's emitted.
1681 if (Context.getInlineVariableDefinitionKind(VD) ==
1682 ASTContext::InlineVariableDefinitionKind::Strong)
1683 GetAddrOfGlobalVar(VD);
1688 // Defer code generation to first use when possible, e.g. if this is an inline
1689 // function. If the global must always be emitted, do it eagerly if possible
1690 // to benefit from cache locality.
1691 if (MustBeEmitted(Global) && MayBeEmittedEagerly(Global)) {
1692 // Emit the definition if it can't be deferred.
1693 EmitGlobalDefinition(GD);
1697 // If we're deferring emission of a C++ variable with an
1698 // initializer, remember the order in which it appeared in the file.
1699 if (getLangOpts().CPlusPlus && isa<VarDecl>(Global) &&
1700 cast<VarDecl>(Global)->hasInit()) {
1701 DelayedCXXInitPosition[Global] = CXXGlobalInits.size();
1702 CXXGlobalInits.push_back(nullptr);
1705 StringRef MangledName = getMangledName(GD);
1706 if (GetGlobalValue(MangledName) != nullptr) {
1707 // The value has already been used and should therefore be emitted.
1708 addDeferredDeclToEmit(GD);
1709 } else if (MustBeEmitted(Global)) {
1710 // The value must be emitted, but cannot be emitted eagerly.
1711 assert(!MayBeEmittedEagerly(Global));
1712 addDeferredDeclToEmit(GD);
1714 // Otherwise, remember that we saw a deferred decl with this name. The
1715 // first use of the mangled name will cause it to move into
1716 // DeferredDeclsToEmit.
1717 DeferredDecls[MangledName] = GD;
1721 // Check if T is a class type with a destructor that's not dllimport.
1722 static bool HasNonDllImportDtor(QualType T) {
1723 if (const auto *RT = T->getBaseElementTypeUnsafe()->getAs<RecordType>())
1724 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()))
1725 if (RD->getDestructor() && !RD->getDestructor()->hasAttr<DLLImportAttr>())
1732 struct FunctionIsDirectlyRecursive :
1733 public RecursiveASTVisitor<FunctionIsDirectlyRecursive> {
1734 const StringRef Name;
1735 const Builtin::Context &BI;
1737 FunctionIsDirectlyRecursive(StringRef N, const Builtin::Context &C) :
1738 Name(N), BI(C), Result(false) {
1740 typedef RecursiveASTVisitor<FunctionIsDirectlyRecursive> Base;
1742 bool TraverseCallExpr(CallExpr *E) {
1743 const FunctionDecl *FD = E->getDirectCallee();
1746 AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
1747 if (Attr && Name == Attr->getLabel()) {
1751 unsigned BuiltinID = FD->getBuiltinID();
1752 if (!BuiltinID || !BI.isLibFunction(BuiltinID))
1754 StringRef BuiltinName = BI.getName(BuiltinID);
1755 if (BuiltinName.startswith("__builtin_") &&
1756 Name == BuiltinName.slice(strlen("__builtin_"), StringRef::npos)) {
1764 // Make sure we're not referencing non-imported vars or functions.
1765 struct DLLImportFunctionVisitor
1766 : public RecursiveASTVisitor<DLLImportFunctionVisitor> {
1767 bool SafeToInline = true;
1769 bool shouldVisitImplicitCode() const { return true; }
1771 bool VisitVarDecl(VarDecl *VD) {
1772 if (VD->getTLSKind()) {
1773 // A thread-local variable cannot be imported.
1774 SafeToInline = false;
1775 return SafeToInline;
1778 // A variable definition might imply a destructor call.
1779 if (VD->isThisDeclarationADefinition())
1780 SafeToInline = !HasNonDllImportDtor(VD->getType());
1782 return SafeToInline;
1785 bool VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) {
1786 if (const auto *D = E->getTemporary()->getDestructor())
1787 SafeToInline = D->hasAttr<DLLImportAttr>();
1788 return SafeToInline;
1791 bool VisitDeclRefExpr(DeclRefExpr *E) {
1792 ValueDecl *VD = E->getDecl();
1793 if (isa<FunctionDecl>(VD))
1794 SafeToInline = VD->hasAttr<DLLImportAttr>();
1795 else if (VarDecl *V = dyn_cast<VarDecl>(VD))
1796 SafeToInline = !V->hasGlobalStorage() || V->hasAttr<DLLImportAttr>();
1797 return SafeToInline;
1800 bool VisitCXXConstructExpr(CXXConstructExpr *E) {
1801 SafeToInline = E->getConstructor()->hasAttr<DLLImportAttr>();
1802 return SafeToInline;
1805 bool VisitCXXMemberCallExpr(CXXMemberCallExpr *E) {
1806 CXXMethodDecl *M = E->getMethodDecl();
1808 // Call through a pointer to member function. This is safe to inline.
1809 SafeToInline = true;
1811 SafeToInline = M->hasAttr<DLLImportAttr>();
1813 return SafeToInline;
1816 bool VisitCXXDeleteExpr(CXXDeleteExpr *E) {
1817 SafeToInline = E->getOperatorDelete()->hasAttr<DLLImportAttr>();
1818 return SafeToInline;
1821 bool VisitCXXNewExpr(CXXNewExpr *E) {
1822 SafeToInline = E->getOperatorNew()->hasAttr<DLLImportAttr>();
1823 return SafeToInline;
1828 // isTriviallyRecursive - Check if this function calls another
1829 // decl that, because of the asm attribute or the other decl being a builtin,
1830 // ends up pointing to itself.
1832 CodeGenModule::isTriviallyRecursive(const FunctionDecl *FD) {
1834 if (getCXXABI().getMangleContext().shouldMangleDeclName(FD)) {
1835 // asm labels are a special kind of mangling we have to support.
1836 AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
1839 Name = Attr->getLabel();
1841 Name = FD->getName();
1844 FunctionIsDirectlyRecursive Walker(Name, Context.BuiltinInfo);
1845 Walker.TraverseFunctionDecl(const_cast<FunctionDecl*>(FD));
1846 return Walker.Result;
1849 bool CodeGenModule::shouldEmitFunction(GlobalDecl GD) {
1850 if (getFunctionLinkage(GD) != llvm::Function::AvailableExternallyLinkage)
1852 const auto *F = cast<FunctionDecl>(GD.getDecl());
1853 if (CodeGenOpts.OptimizationLevel == 0 && !F->hasAttr<AlwaysInlineAttr>())
1856 if (F->hasAttr<DLLImportAttr>()) {
1857 // Check whether it would be safe to inline this dllimport function.
1858 DLLImportFunctionVisitor Visitor;
1859 Visitor.TraverseFunctionDecl(const_cast<FunctionDecl*>(F));
1860 if (!Visitor.SafeToInline)
1863 if (const CXXDestructorDecl *Dtor = dyn_cast<CXXDestructorDecl>(F)) {
1864 // Implicit destructor invocations aren't captured in the AST, so the
1865 // check above can't see them. Check for them manually here.
1866 for (const Decl *Member : Dtor->getParent()->decls())
1867 if (isa<FieldDecl>(Member))
1868 if (HasNonDllImportDtor(cast<FieldDecl>(Member)->getType()))
1870 for (const CXXBaseSpecifier &B : Dtor->getParent()->bases())
1871 if (HasNonDllImportDtor(B.getType()))
1876 // PR9614. Avoid cases where the source code is lying to us. An available
1877 // externally function should have an equivalent function somewhere else,
1878 // but a function that calls itself is clearly not equivalent to the real
1880 // This happens in glibc's btowc and in some configure checks.
1881 return !isTriviallyRecursive(F);
1884 void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD, llvm::GlobalValue *GV) {
1885 const auto *D = cast<ValueDecl>(GD.getDecl());
1887 PrettyStackTraceDecl CrashInfo(const_cast<ValueDecl *>(D), D->getLocation(),
1888 Context.getSourceManager(),
1889 "Generating code for declaration");
1891 if (isa<FunctionDecl>(D)) {
1892 // At -O0, don't generate IR for functions with available_externally
1894 if (!shouldEmitFunction(GD))
1897 if (const auto *Method = dyn_cast<CXXMethodDecl>(D)) {
1898 // Make sure to emit the definition(s) before we emit the thunks.
1899 // This is necessary for the generation of certain thunks.
1900 if (const auto *CD = dyn_cast<CXXConstructorDecl>(Method))
1901 ABI->emitCXXStructor(CD, getFromCtorType(GD.getCtorType()));
1902 else if (const auto *DD = dyn_cast<CXXDestructorDecl>(Method))
1903 ABI->emitCXXStructor(DD, getFromDtorType(GD.getDtorType()));
1905 EmitGlobalFunctionDefinition(GD, GV);
1907 if (Method->isVirtual())
1908 getVTables().EmitThunks(GD);
1913 return EmitGlobalFunctionDefinition(GD, GV);
1916 if (const auto *VD = dyn_cast<VarDecl>(D))
1917 return EmitGlobalVarDefinition(VD, !VD->hasDefinition());
1919 llvm_unreachable("Invalid argument to EmitGlobalDefinition()");
1922 static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old,
1923 llvm::Function *NewFn);
1925 /// GetOrCreateLLVMFunction - If the specified mangled name is not in the
1926 /// module, create and return an llvm Function with the specified type. If there
1927 /// is something in the module with the specified name, return it potentially
1928 /// bitcasted to the right type.
1930 /// If D is non-null, it specifies a decl that correspond to this. This is used
1931 /// to set the attributes on the function when it is first created.
1932 llvm::Constant *CodeGenModule::GetOrCreateLLVMFunction(
1933 StringRef MangledName, llvm::Type *Ty, GlobalDecl GD, bool ForVTable,
1934 bool DontDefer, bool IsThunk, llvm::AttributeList ExtraAttrs,
1935 ForDefinition_t IsForDefinition) {
1936 const Decl *D = GD.getDecl();
1938 // Lookup the entry, lazily creating it if necessary.
1939 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
1941 if (WeakRefReferences.erase(Entry)) {
1942 const FunctionDecl *FD = cast_or_null<FunctionDecl>(D);
1943 if (FD && !FD->hasAttr<WeakAttr>())
1944 Entry->setLinkage(llvm::Function::ExternalLinkage);
1947 // Handle dropped DLL attributes.
1948 if (D && !D->hasAttr<DLLImportAttr>() && !D->hasAttr<DLLExportAttr>())
1949 Entry->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
1951 // If there are two attempts to define the same mangled name, issue an
1953 if (IsForDefinition && !Entry->isDeclaration()) {
1955 // Check that GD is not yet in DiagnosedConflictingDefinitions is required
1956 // to make sure that we issue an error only once.
1957 if (lookupRepresentativeDecl(MangledName, OtherGD) &&
1958 (GD.getCanonicalDecl().getDecl() !=
1959 OtherGD.getCanonicalDecl().getDecl()) &&
1960 DiagnosedConflictingDefinitions.insert(GD).second) {
1961 getDiags().Report(D->getLocation(),
1962 diag::err_duplicate_mangled_name);
1963 getDiags().Report(OtherGD.getDecl()->getLocation(),
1964 diag::note_previous_definition);
1968 if ((isa<llvm::Function>(Entry) || isa<llvm::GlobalAlias>(Entry)) &&
1969 (Entry->getType()->getElementType() == Ty)) {
1973 // Make sure the result is of the correct type.
1974 // (If function is requested for a definition, we always need to create a new
1975 // function, not just return a bitcast.)
1976 if (!IsForDefinition)
1977 return llvm::ConstantExpr::getBitCast(Entry, Ty->getPointerTo());
1980 // This function doesn't have a complete type (for example, the return
1981 // type is an incomplete struct). Use a fake type instead, and make
1982 // sure not to try to set attributes.
1983 bool IsIncompleteFunction = false;
1985 llvm::FunctionType *FTy;
1986 if (isa<llvm::FunctionType>(Ty)) {
1987 FTy = cast<llvm::FunctionType>(Ty);
1989 FTy = llvm::FunctionType::get(VoidTy, false);
1990 IsIncompleteFunction = true;
1994 llvm::Function::Create(FTy, llvm::Function::ExternalLinkage,
1995 Entry ? StringRef() : MangledName, &getModule());
1997 // If we already created a function with the same mangled name (but different
1998 // type) before, take its name and add it to the list of functions to be
1999 // replaced with F at the end of CodeGen.
2001 // This happens if there is a prototype for a function (e.g. "int f()") and
2002 // then a definition of a different type (e.g. "int f(int x)").
2006 // This might be an implementation of a function without a prototype, in
2007 // which case, try to do special replacement of calls which match the new
2008 // prototype. The really key thing here is that we also potentially drop
2009 // arguments from the call site so as to make a direct call, which makes the
2010 // inliner happier and suppresses a number of optimizer warnings (!) about
2011 // dropping arguments.
2012 if (!Entry->use_empty()) {
2013 ReplaceUsesOfNonProtoTypeWithRealFunction(Entry, F);
2014 Entry->removeDeadConstantUsers();
2017 llvm::Constant *BC = llvm::ConstantExpr::getBitCast(
2018 F, Entry->getType()->getElementType()->getPointerTo());
2019 addGlobalValReplacement(Entry, BC);
2022 assert(F->getName() == MangledName && "name was uniqued!");
2024 SetFunctionAttributes(GD, F, IsIncompleteFunction, IsThunk);
2025 if (ExtraAttrs.hasAttributes(llvm::AttributeList::FunctionIndex)) {
2026 llvm::AttrBuilder B(ExtraAttrs, llvm::AttributeList::FunctionIndex);
2027 F->addAttributes(llvm::AttributeList::FunctionIndex, B);
2031 // All MSVC dtors other than the base dtor are linkonce_odr and delegate to
2032 // each other bottoming out with the base dtor. Therefore we emit non-base
2033 // dtors on usage, even if there is no dtor definition in the TU.
2034 if (D && isa<CXXDestructorDecl>(D) &&
2035 getCXXABI().useThunkForDtorVariant(cast<CXXDestructorDecl>(D),
2037 addDeferredDeclToEmit(GD);
2039 // This is the first use or definition of a mangled name. If there is a
2040 // deferred decl with this name, remember that we need to emit it at the end
2042 auto DDI = DeferredDecls.find(MangledName);
2043 if (DDI != DeferredDecls.end()) {
2044 // Move the potentially referenced deferred decl to the
2045 // DeferredDeclsToEmit list, and remove it from DeferredDecls (since we
2046 // don't need it anymore).
2047 addDeferredDeclToEmit(DDI->second);
2048 DeferredDecls.erase(DDI);
2050 // Otherwise, there are cases we have to worry about where we're
2051 // using a declaration for which we must emit a definition but where
2052 // we might not find a top-level definition:
2053 // - member functions defined inline in their classes
2054 // - friend functions defined inline in some class
2055 // - special member functions with implicit definitions
2056 // If we ever change our AST traversal to walk into class methods,
2057 // this will be unnecessary.
2059 // We also don't emit a definition for a function if it's going to be an
2060 // entry in a vtable, unless it's already marked as used.
2061 } else if (getLangOpts().CPlusPlus && D) {
2062 // Look for a declaration that's lexically in a record.
2063 for (const auto *FD = cast<FunctionDecl>(D)->getMostRecentDecl(); FD;
2064 FD = FD->getPreviousDecl()) {
2065 if (isa<CXXRecordDecl>(FD->getLexicalDeclContext())) {
2066 if (FD->doesThisDeclarationHaveABody()) {
2067 addDeferredDeclToEmit(GD.getWithDecl(FD));
2075 // Make sure the result is of the requested type.
2076 if (!IsIncompleteFunction) {
2077 assert(F->getType()->getElementType() == Ty);
2081 llvm::Type *PTy = llvm::PointerType::getUnqual(Ty);
2082 return llvm::ConstantExpr::getBitCast(F, PTy);
2085 /// GetAddrOfFunction - Return the address of the given function. If Ty is
2086 /// non-null, then this function will use the specified type if it has to
2087 /// create it (this occurs when we see a definition of the function).
2088 llvm::Constant *CodeGenModule::GetAddrOfFunction(GlobalDecl GD,
2092 ForDefinition_t IsForDefinition) {
2093 // If there was no specific requested type, just convert it now.
2095 const auto *FD = cast<FunctionDecl>(GD.getDecl());
2096 auto CanonTy = Context.getCanonicalType(FD->getType());
2097 Ty = getTypes().ConvertFunctionType(CanonTy, FD);
2100 StringRef MangledName = getMangledName(GD);
2101 return GetOrCreateLLVMFunction(MangledName, Ty, GD, ForVTable, DontDefer,
2102 /*IsThunk=*/false, llvm::AttributeList(),
2106 static const FunctionDecl *
2107 GetRuntimeFunctionDecl(ASTContext &C, StringRef Name) {
2108 TranslationUnitDecl *TUDecl = C.getTranslationUnitDecl();
2109 DeclContext *DC = TranslationUnitDecl::castToDeclContext(TUDecl);
2111 IdentifierInfo &CII = C.Idents.get(Name);
2112 for (const auto &Result : DC->lookup(&CII))
2113 if (const auto FD = dyn_cast<FunctionDecl>(Result))
2116 if (!C.getLangOpts().CPlusPlus)
2119 // Demangle the premangled name from getTerminateFn()
2120 IdentifierInfo &CXXII =
2121 (Name == "_ZSt9terminatev" || Name == "\01?terminate@@YAXXZ")
2122 ? C.Idents.get("terminate")
2123 : C.Idents.get(Name);
2125 for (const auto &N : {"__cxxabiv1", "std"}) {
2126 IdentifierInfo &NS = C.Idents.get(N);
2127 for (const auto &Result : DC->lookup(&NS)) {
2128 NamespaceDecl *ND = dyn_cast<NamespaceDecl>(Result);
2129 if (auto LSD = dyn_cast<LinkageSpecDecl>(Result))
2130 for (const auto &Result : LSD->lookup(&NS))
2131 if ((ND = dyn_cast<NamespaceDecl>(Result)))
2135 for (const auto &Result : ND->lookup(&CXXII))
2136 if (const auto *FD = dyn_cast<FunctionDecl>(Result))
2144 /// CreateRuntimeFunction - Create a new runtime function with the specified
2147 CodeGenModule::CreateRuntimeFunction(llvm::FunctionType *FTy, StringRef Name,
2148 llvm::AttributeList ExtraAttrs,
2151 GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(), /*ForVTable=*/false,
2152 /*DontDefer=*/false, /*IsThunk=*/false,
2155 if (auto *F = dyn_cast<llvm::Function>(C)) {
2157 F->setCallingConv(getRuntimeCC());
2159 if (!Local && getTriple().isOSBinFormatCOFF() &&
2160 !getCodeGenOpts().LTOVisibilityPublicStd) {
2161 const FunctionDecl *FD = GetRuntimeFunctionDecl(Context, Name);
2162 if (!FD || FD->hasAttr<DLLImportAttr>()) {
2163 F->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
2164 F->setLinkage(llvm::GlobalValue::ExternalLinkage);
2173 /// CreateBuiltinFunction - Create a new builtin function with the specified
2176 CodeGenModule::CreateBuiltinFunction(llvm::FunctionType *FTy, StringRef Name,
2177 llvm::AttributeList ExtraAttrs) {
2179 GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(), /*ForVTable=*/false,
2180 /*DontDefer=*/false, /*IsThunk=*/false, ExtraAttrs);
2181 if (auto *F = dyn_cast<llvm::Function>(C))
2183 F->setCallingConv(getBuiltinCC());
2187 /// isTypeConstant - Determine whether an object of this type can be emitted
2190 /// If ExcludeCtor is true, the duration when the object's constructor runs
2191 /// will not be considered. The caller will need to verify that the object is
2192 /// not written to during its construction.
2193 bool CodeGenModule::isTypeConstant(QualType Ty, bool ExcludeCtor) {
2194 if (!Ty.isConstant(Context) && !Ty->isReferenceType())
2197 if (Context.getLangOpts().CPlusPlus) {
2198 if (const CXXRecordDecl *Record
2199 = Context.getBaseElementType(Ty)->getAsCXXRecordDecl())
2200 return ExcludeCtor && !Record->hasMutableFields() &&
2201 Record->hasTrivialDestructor();
2207 /// GetOrCreateLLVMGlobal - If the specified mangled name is not in the module,
2208 /// create and return an llvm GlobalVariable with the specified type. If there
2209 /// is something in the module with the specified name, return it potentially
2210 /// bitcasted to the right type.
2212 /// If D is non-null, it specifies a decl that correspond to this. This is used
2213 /// to set the attributes on the global when it is first created.
2215 /// If IsForDefinition is true, it is guranteed that an actual global with
2216 /// type Ty will be returned, not conversion of a variable with the same
2217 /// mangled name but some other type.
2219 CodeGenModule::GetOrCreateLLVMGlobal(StringRef MangledName,
2220 llvm::PointerType *Ty,
2222 ForDefinition_t IsForDefinition) {
2223 // Lookup the entry, lazily creating it if necessary.
2224 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
2226 if (WeakRefReferences.erase(Entry)) {
2227 if (D && !D->hasAttr<WeakAttr>())
2228 Entry->setLinkage(llvm::Function::ExternalLinkage);
2231 // Handle dropped DLL attributes.
2232 if (D && !D->hasAttr<DLLImportAttr>() && !D->hasAttr<DLLExportAttr>())
2233 Entry->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
2235 if (Entry->getType() == Ty)
2238 // If there are two attempts to define the same mangled name, issue an
2240 if (IsForDefinition && !Entry->isDeclaration()) {
2242 const VarDecl *OtherD;
2244 // Check that D is not yet in DiagnosedConflictingDefinitions is required
2245 // to make sure that we issue an error only once.
2246 if (D && lookupRepresentativeDecl(MangledName, OtherGD) &&
2247 (D->getCanonicalDecl() != OtherGD.getCanonicalDecl().getDecl()) &&
2248 (OtherD = dyn_cast<VarDecl>(OtherGD.getDecl())) &&
2249 OtherD->hasInit() &&
2250 DiagnosedConflictingDefinitions.insert(D).second) {
2251 getDiags().Report(D->getLocation(),
2252 diag::err_duplicate_mangled_name);
2253 getDiags().Report(OtherGD.getDecl()->getLocation(),
2254 diag::note_previous_definition);
2258 // Make sure the result is of the correct type.
2259 if (Entry->getType()->getAddressSpace() != Ty->getAddressSpace())
2260 return llvm::ConstantExpr::getAddrSpaceCast(Entry, Ty);
2262 // (If global is requested for a definition, we always need to create a new
2263 // global, not just return a bitcast.)
2264 if (!IsForDefinition)
2265 return llvm::ConstantExpr::getBitCast(Entry, Ty);
2268 unsigned AddrSpace = GetGlobalVarAddressSpace(D, Ty->getAddressSpace());
2269 auto *GV = new llvm::GlobalVariable(
2270 getModule(), Ty->getElementType(), false,
2271 llvm::GlobalValue::ExternalLinkage, nullptr, MangledName, nullptr,
2272 llvm::GlobalVariable::NotThreadLocal, AddrSpace);
2274 // If we already created a global with the same mangled name (but different
2275 // type) before, take its name and remove it from its parent.
2277 GV->takeName(Entry);
2279 if (!Entry->use_empty()) {
2280 llvm::Constant *NewPtrForOldDecl =
2281 llvm::ConstantExpr::getBitCast(GV, Entry->getType());
2282 Entry->replaceAllUsesWith(NewPtrForOldDecl);
2285 Entry->eraseFromParent();
2288 // This is the first use or definition of a mangled name. If there is a
2289 // deferred decl with this name, remember that we need to emit it at the end
2291 auto DDI = DeferredDecls.find(MangledName);
2292 if (DDI != DeferredDecls.end()) {
2293 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit
2294 // list, and remove it from DeferredDecls (since we don't need it anymore).
2295 addDeferredDeclToEmit(DDI->second);
2296 DeferredDecls.erase(DDI);
2299 // Handle things which are present even on external declarations.
2301 // FIXME: This code is overly simple and should be merged with other global
2303 GV->setConstant(isTypeConstant(D->getType(), false));
2305 GV->setAlignment(getContext().getDeclAlign(D).getQuantity());
2307 setLinkageAndVisibilityForGV(GV, D);
2309 if (D->getTLSKind()) {
2310 if (D->getTLSKind() == VarDecl::TLS_Dynamic)
2311 CXXThreadLocals.push_back(D);
2315 // If required by the ABI, treat declarations of static data members with
2316 // inline initializers as definitions.
2317 if (getContext().isMSStaticDataMemberInlineDefinition(D)) {
2318 EmitGlobalVarDefinition(D);
2321 // Handle XCore specific ABI requirements.
2322 if (getTriple().getArch() == llvm::Triple::xcore &&
2323 D->getLanguageLinkage() == CLanguageLinkage &&
2324 D->getType().isConstant(Context) &&
2325 isExternallyVisible(D->getLinkageAndVisibility().getLinkage()))
2326 GV->setSection(".cp.rodata");
2329 if (AddrSpace != Ty->getAddressSpace())
2330 return llvm::ConstantExpr::getAddrSpaceCast(GV, Ty);
2336 CodeGenModule::GetAddrOfGlobal(GlobalDecl GD,
2337 ForDefinition_t IsForDefinition) {
2338 const Decl *D = GD.getDecl();
2339 if (isa<CXXConstructorDecl>(D))
2340 return getAddrOfCXXStructor(cast<CXXConstructorDecl>(D),
2341 getFromCtorType(GD.getCtorType()),
2342 /*FnInfo=*/nullptr, /*FnType=*/nullptr,
2343 /*DontDefer=*/false, IsForDefinition);
2344 else if (isa<CXXDestructorDecl>(D))
2345 return getAddrOfCXXStructor(cast<CXXDestructorDecl>(D),
2346 getFromDtorType(GD.getDtorType()),
2347 /*FnInfo=*/nullptr, /*FnType=*/nullptr,
2348 /*DontDefer=*/false, IsForDefinition);
2349 else if (isa<CXXMethodDecl>(D)) {
2350 auto FInfo = &getTypes().arrangeCXXMethodDeclaration(
2351 cast<CXXMethodDecl>(D));
2352 auto Ty = getTypes().GetFunctionType(*FInfo);
2353 return GetAddrOfFunction(GD, Ty, /*ForVTable=*/false, /*DontDefer=*/false,
2355 } else if (isa<FunctionDecl>(D)) {
2356 const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
2357 llvm::FunctionType *Ty = getTypes().GetFunctionType(FI);
2358 return GetAddrOfFunction(GD, Ty, /*ForVTable=*/false, /*DontDefer=*/false,
2361 return GetAddrOfGlobalVar(cast<VarDecl>(D), /*Ty=*/nullptr,
2365 llvm::GlobalVariable *
2366 CodeGenModule::CreateOrReplaceCXXRuntimeVariable(StringRef Name,
2368 llvm::GlobalValue::LinkageTypes Linkage) {
2369 llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name);
2370 llvm::GlobalVariable *OldGV = nullptr;
2373 // Check if the variable has the right type.
2374 if (GV->getType()->getElementType() == Ty)
2377 // Because C++ name mangling, the only way we can end up with an already
2378 // existing global with the same name is if it has been declared extern "C".
2379 assert(GV->isDeclaration() && "Declaration has wrong type!");
2383 // Create a new variable.
2384 GV = new llvm::GlobalVariable(getModule(), Ty, /*isConstant=*/true,
2385 Linkage, nullptr, Name);
2388 // Replace occurrences of the old variable if needed.
2389 GV->takeName(OldGV);
2391 if (!OldGV->use_empty()) {
2392 llvm::Constant *NewPtrForOldDecl =
2393 llvm::ConstantExpr::getBitCast(GV, OldGV->getType());
2394 OldGV->replaceAllUsesWith(NewPtrForOldDecl);
2397 OldGV->eraseFromParent();
2400 if (supportsCOMDAT() && GV->isWeakForLinker() &&
2401 !GV->hasAvailableExternallyLinkage())
2402 GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
2407 /// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the
2408 /// given global variable. If Ty is non-null and if the global doesn't exist,
2409 /// then it will be created with the specified type instead of whatever the
2410 /// normal requested type would be. If IsForDefinition is true, it is guranteed
2411 /// that an actual global with type Ty will be returned, not conversion of a
2412 /// variable with the same mangled name but some other type.
2413 llvm::Constant *CodeGenModule::GetAddrOfGlobalVar(const VarDecl *D,
2415 ForDefinition_t IsForDefinition) {
2416 assert(D->hasGlobalStorage() && "Not a global variable");
2417 QualType ASTTy = D->getType();
2419 Ty = getTypes().ConvertTypeForMem(ASTTy);
2421 llvm::PointerType *PTy =
2422 llvm::PointerType::get(Ty, getContext().getTargetAddressSpace(ASTTy));
2424 StringRef MangledName = getMangledName(D);
2425 return GetOrCreateLLVMGlobal(MangledName, PTy, D, IsForDefinition);
2428 /// CreateRuntimeVariable - Create a new runtime global variable with the
2429 /// specified type and name.
2431 CodeGenModule::CreateRuntimeVariable(llvm::Type *Ty,
2433 return GetOrCreateLLVMGlobal(Name, llvm::PointerType::getUnqual(Ty), nullptr);
2436 void CodeGenModule::EmitTentativeDefinition(const VarDecl *D) {
2437 assert(!D->getInit() && "Cannot emit definite definitions here!");
2439 StringRef MangledName = getMangledName(D);
2440 llvm::GlobalValue *GV = GetGlobalValue(MangledName);
2442 // We already have a definition, not declaration, with the same mangled name.
2443 // Emitting of declaration is not required (and actually overwrites emitted
2445 if (GV && !GV->isDeclaration())
2448 // If we have not seen a reference to this variable yet, place it into the
2449 // deferred declarations table to be emitted if needed later.
2450 if (!MustBeEmitted(D) && !GV) {
2451 DeferredDecls[MangledName] = D;
2455 // The tentative definition is the only definition.
2456 EmitGlobalVarDefinition(D);
2459 CharUnits CodeGenModule::GetTargetTypeStoreSize(llvm::Type *Ty) const {
2460 return Context.toCharUnitsFromBits(
2461 getDataLayout().getTypeStoreSizeInBits(Ty));
2464 unsigned CodeGenModule::GetGlobalVarAddressSpace(const VarDecl *D,
2465 unsigned AddrSpace) {
2466 if (D && LangOpts.CUDA && LangOpts.CUDAIsDevice) {
2467 if (D->hasAttr<CUDAConstantAttr>())
2468 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_constant);
2469 else if (D->hasAttr<CUDASharedAttr>())
2470 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_shared);
2472 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_device);
2478 template<typename SomeDecl>
2479 void CodeGenModule::MaybeHandleStaticInExternC(const SomeDecl *D,
2480 llvm::GlobalValue *GV) {
2481 if (!getLangOpts().CPlusPlus)
2484 // Must have 'used' attribute, or else inline assembly can't rely on
2485 // the name existing.
2486 if (!D->template hasAttr<UsedAttr>())
2489 // Must have internal linkage and an ordinary name.
2490 if (!D->getIdentifier() || D->getFormalLinkage() != InternalLinkage)
2493 // Must be in an extern "C" context. Entities declared directly within
2494 // a record are not extern "C" even if the record is in such a context.
2495 const SomeDecl *First = D->getFirstDecl();
2496 if (First->getDeclContext()->isRecord() || !First->isInExternCContext())
2499 // OK, this is an internal linkage entity inside an extern "C" linkage
2500 // specification. Make a note of that so we can give it the "expected"
2501 // mangled name if nothing else is using that name.
2502 std::pair<StaticExternCMap::iterator, bool> R =
2503 StaticExternCValues.insert(std::make_pair(D->getIdentifier(), GV));
2505 // If we have multiple internal linkage entities with the same name
2506 // in extern "C" regions, none of them gets that name.
2508 R.first->second = nullptr;
2511 static bool shouldBeInCOMDAT(CodeGenModule &CGM, const Decl &D) {
2512 if (!CGM.supportsCOMDAT())
2515 if (D.hasAttr<SelectAnyAttr>())
2519 if (auto *VD = dyn_cast<VarDecl>(&D))
2520 Linkage = CGM.getContext().GetGVALinkageForVariable(VD);
2522 Linkage = CGM.getContext().GetGVALinkageForFunction(cast<FunctionDecl>(&D));
2526 case GVA_AvailableExternally:
2527 case GVA_StrongExternal:
2529 case GVA_DiscardableODR:
2533 llvm_unreachable("No such linkage");
2536 void CodeGenModule::maybeSetTrivialComdat(const Decl &D,
2537 llvm::GlobalObject &GO) {
2538 if (!shouldBeInCOMDAT(*this, D))
2540 GO.setComdat(TheModule.getOrInsertComdat(GO.getName()));
2543 /// Pass IsTentative as true if you want to create a tentative definition.
2544 void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D,
2546 // OpenCL global variables of sampler type are translated to function calls,
2547 // therefore no need to be translated.
2548 QualType ASTTy = D->getType();
2549 if (getLangOpts().OpenCL && ASTTy->isSamplerT())
2552 llvm::Constant *Init = nullptr;
2553 CXXRecordDecl *RD = ASTTy->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
2554 bool NeedsGlobalCtor = false;
2555 bool NeedsGlobalDtor = RD && !RD->hasTrivialDestructor();
2557 const VarDecl *InitDecl;
2558 const Expr *InitExpr = D->getAnyInitializer(InitDecl);
2560 // CUDA E.2.4.1 "__shared__ variables cannot have an initialization
2561 // as part of their declaration." Sema has already checked for
2562 // error cases, so we just need to set Init to UndefValue.
2563 if (getLangOpts().CUDA && getLangOpts().CUDAIsDevice &&
2564 D->hasAttr<CUDASharedAttr>())
2565 Init = llvm::UndefValue::get(getTypes().ConvertType(ASTTy));
2566 else if (!InitExpr) {
2567 // This is a tentative definition; tentative definitions are
2568 // implicitly initialized with { 0 }.
2570 // Note that tentative definitions are only emitted at the end of
2571 // a translation unit, so they should never have incomplete
2572 // type. In addition, EmitTentativeDefinition makes sure that we
2573 // never attempt to emit a tentative definition if a real one
2574 // exists. A use may still exists, however, so we still may need
2576 assert(!ASTTy->isIncompleteType() && "Unexpected incomplete type");
2577 Init = EmitNullConstant(D->getType());
2579 initializedGlobalDecl = GlobalDecl(D);
2580 Init = EmitConstantInit(*InitDecl);
2583 QualType T = InitExpr->getType();
2584 if (D->getType()->isReferenceType())
2587 if (getLangOpts().CPlusPlus) {
2588 Init = EmitNullConstant(T);
2589 NeedsGlobalCtor = true;
2591 ErrorUnsupported(D, "static initializer");
2592 Init = llvm::UndefValue::get(getTypes().ConvertType(T));
2595 // We don't need an initializer, so remove the entry for the delayed
2596 // initializer position (just in case this entry was delayed) if we
2597 // also don't need to register a destructor.
2598 if (getLangOpts().CPlusPlus && !NeedsGlobalDtor)
2599 DelayedCXXInitPosition.erase(D);
2603 llvm::Type* InitType = Init->getType();
2604 llvm::Constant *Entry =
2605 GetAddrOfGlobalVar(D, InitType, ForDefinition_t(!IsTentative));
2607 // Strip off a bitcast if we got one back.
2608 if (auto *CE = dyn_cast<llvm::ConstantExpr>(Entry)) {
2609 assert(CE->getOpcode() == llvm::Instruction::BitCast ||
2610 CE->getOpcode() == llvm::Instruction::AddrSpaceCast ||
2611 // All zero index gep.
2612 CE->getOpcode() == llvm::Instruction::GetElementPtr);
2613 Entry = CE->getOperand(0);
2616 // Entry is now either a Function or GlobalVariable.
2617 auto *GV = dyn_cast<llvm::GlobalVariable>(Entry);
2619 // We have a definition after a declaration with the wrong type.
2620 // We must make a new GlobalVariable* and update everything that used OldGV
2621 // (a declaration or tentative definition) with the new GlobalVariable*
2622 // (which will be a definition).
2624 // This happens if there is a prototype for a global (e.g.
2625 // "extern int x[];") and then a definition of a different type (e.g.
2626 // "int x[10];"). This also happens when an initializer has a different type
2627 // from the type of the global (this happens with unions).
2629 GV->getType()->getElementType() != InitType ||
2630 GV->getType()->getAddressSpace() !=
2631 GetGlobalVarAddressSpace(D, getContext().getTargetAddressSpace(ASTTy))) {
2633 // Move the old entry aside so that we'll create a new one.
2634 Entry->setName(StringRef());
2636 // Make a new global with the correct type, this is now guaranteed to work.
2637 GV = cast<llvm::GlobalVariable>(
2638 GetAddrOfGlobalVar(D, InitType, ForDefinition_t(!IsTentative)));
2640 // Replace all uses of the old global with the new global
2641 llvm::Constant *NewPtrForOldDecl =
2642 llvm::ConstantExpr::getBitCast(GV, Entry->getType());
2643 Entry->replaceAllUsesWith(NewPtrForOldDecl);
2645 // Erase the old global, since it is no longer used.
2646 cast<llvm::GlobalValue>(Entry)->eraseFromParent();
2649 MaybeHandleStaticInExternC(D, GV);
2651 if (D->hasAttr<AnnotateAttr>())
2652 AddGlobalAnnotations(D, GV);
2654 // Set the llvm linkage type as appropriate.
2655 llvm::GlobalValue::LinkageTypes Linkage =
2656 getLLVMLinkageVarDefinition(D, GV->isConstant());
2658 // CUDA B.2.1 "The __device__ qualifier declares a variable that resides on
2659 // the device. [...]"
2660 // CUDA B.2.2 "The __constant__ qualifier, optionally used together with
2661 // __device__, declares a variable that: [...]
2662 // Is accessible from all the threads within the grid and from the host
2663 // through the runtime library (cudaGetSymbolAddress() / cudaGetSymbolSize()
2664 // / cudaMemcpyToSymbol() / cudaMemcpyFromSymbol())."
2665 if (GV && LangOpts.CUDA) {
2666 if (LangOpts.CUDAIsDevice) {
2667 if (D->hasAttr<CUDADeviceAttr>() || D->hasAttr<CUDAConstantAttr>())
2668 GV->setExternallyInitialized(true);
2670 // Host-side shadows of external declarations of device-side
2671 // global variables become internal definitions. These have to
2672 // be internal in order to prevent name conflicts with global
2673 // host variables with the same name in a different TUs.
2674 if (D->hasAttr<CUDADeviceAttr>() || D->hasAttr<CUDAConstantAttr>()) {
2675 Linkage = llvm::GlobalValue::InternalLinkage;
2677 // Shadow variables and their properties must be registered
2678 // with CUDA runtime.
2680 if (!D->hasDefinition())
2681 Flags |= CGCUDARuntime::ExternDeviceVar;
2682 if (D->hasAttr<CUDAConstantAttr>())
2683 Flags |= CGCUDARuntime::ConstantDeviceVar;
2684 getCUDARuntime().registerDeviceVar(*GV, Flags);
2685 } else if (D->hasAttr<CUDASharedAttr>())
2686 // __shared__ variables are odd. Shadows do get created, but
2687 // they are not registered with the CUDA runtime, so they
2688 // can't really be used to access their device-side
2689 // counterparts. It's not clear yet whether it's nvcc's bug or
2690 // a feature, but we've got to do the same for compatibility.
2691 Linkage = llvm::GlobalValue::InternalLinkage;
2694 GV->setInitializer(Init);
2696 // If it is safe to mark the global 'constant', do so now.
2697 GV->setConstant(!NeedsGlobalCtor && !NeedsGlobalDtor &&
2698 isTypeConstant(D->getType(), true));
2700 // If it is in a read-only section, mark it 'constant'.
2701 if (const SectionAttr *SA = D->getAttr<SectionAttr>()) {
2702 const ASTContext::SectionInfo &SI = Context.SectionInfos[SA->getName()];
2703 if ((SI.SectionFlags & ASTContext::PSF_Write) == 0)
2704 GV->setConstant(true);
2707 GV->setAlignment(getContext().getDeclAlign(D).getQuantity());
2710 // On Darwin, if the normal linkage of a C++ thread_local variable is
2711 // LinkOnce or Weak, we keep the normal linkage to prevent multiple
2712 // copies within a linkage unit; otherwise, the backing variable has
2713 // internal linkage and all accesses should just be calls to the
2714 // Itanium-specified entry point, which has the normal linkage of the
2715 // variable. This is to preserve the ability to change the implementation
2716 // behind the scenes.
2717 if (!D->isStaticLocal() && D->getTLSKind() == VarDecl::TLS_Dynamic &&
2718 Context.getTargetInfo().getTriple().isOSDarwin() &&
2719 !llvm::GlobalVariable::isLinkOnceLinkage(Linkage) &&
2720 !llvm::GlobalVariable::isWeakLinkage(Linkage))
2721 Linkage = llvm::GlobalValue::InternalLinkage;
2723 GV->setLinkage(Linkage);
2724 if (D->hasAttr<DLLImportAttr>())
2725 GV->setDLLStorageClass(llvm::GlobalVariable::DLLImportStorageClass);
2726 else if (D->hasAttr<DLLExportAttr>())
2727 GV->setDLLStorageClass(llvm::GlobalVariable::DLLExportStorageClass);
2729 GV->setDLLStorageClass(llvm::GlobalVariable::DefaultStorageClass);
2731 if (Linkage == llvm::GlobalVariable::CommonLinkage) {
2732 // common vars aren't constant even if declared const.
2733 GV->setConstant(false);
2734 // Tentative definition of global variables may be initialized with
2735 // non-zero null pointers. In this case they should have weak linkage
2736 // since common linkage must have zero initializer and must not have
2737 // explicit section therefore cannot have non-zero initial value.
2738 if (!GV->getInitializer()->isNullValue())
2739 GV->setLinkage(llvm::GlobalVariable::WeakAnyLinkage);
2742 setNonAliasAttributes(D, GV);
2744 if (D->getTLSKind() && !GV->isThreadLocal()) {
2745 if (D->getTLSKind() == VarDecl::TLS_Dynamic)
2746 CXXThreadLocals.push_back(D);
2750 maybeSetTrivialComdat(*D, *GV);
2752 // Emit the initializer function if necessary.
2753 if (NeedsGlobalCtor || NeedsGlobalDtor)
2754 EmitCXXGlobalVarDeclInitFunc(D, GV, NeedsGlobalCtor);
2756 SanitizerMD->reportGlobalToASan(GV, *D, NeedsGlobalCtor);
2758 // Emit global variable debug information.
2759 if (CGDebugInfo *DI = getModuleDebugInfo())
2760 if (getCodeGenOpts().getDebugInfo() >= codegenoptions::LimitedDebugInfo)
2761 DI->EmitGlobalVariable(GV, D);
2764 static bool isVarDeclStrongDefinition(const ASTContext &Context,
2765 CodeGenModule &CGM, const VarDecl *D,
2767 // Don't give variables common linkage if -fno-common was specified unless it
2768 // was overridden by a NoCommon attribute.
2769 if ((NoCommon || D->hasAttr<NoCommonAttr>()) && !D->hasAttr<CommonAttr>())
2773 // A declaration of an identifier for an object that has file scope without
2774 // an initializer, and without a storage-class specifier or with the
2775 // storage-class specifier static, constitutes a tentative definition.
2776 if (D->getInit() || D->hasExternalStorage())
2779 // A variable cannot be both common and exist in a section.
2780 if (D->hasAttr<SectionAttr>())
2783 // Thread local vars aren't considered common linkage.
2784 if (D->getTLSKind())
2787 // Tentative definitions marked with WeakImportAttr are true definitions.
2788 if (D->hasAttr<WeakImportAttr>())
2791 // A variable cannot be both common and exist in a comdat.
2792 if (shouldBeInCOMDAT(CGM, *D))
2795 // Declarations with a required alignment do not have common linkage in MSVC
2797 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
2798 if (D->hasAttr<AlignedAttr>())
2800 QualType VarType = D->getType();
2801 if (Context.isAlignmentRequired(VarType))
2804 if (const auto *RT = VarType->getAs<RecordType>()) {
2805 const RecordDecl *RD = RT->getDecl();
2806 for (const FieldDecl *FD : RD->fields()) {
2807 if (FD->isBitField())
2809 if (FD->hasAttr<AlignedAttr>())
2811 if (Context.isAlignmentRequired(FD->getType()))
2820 llvm::GlobalValue::LinkageTypes CodeGenModule::getLLVMLinkageForDeclarator(
2821 const DeclaratorDecl *D, GVALinkage Linkage, bool IsConstantVariable) {
2822 if (Linkage == GVA_Internal)
2823 return llvm::Function::InternalLinkage;
2825 if (D->hasAttr<WeakAttr>()) {
2826 if (IsConstantVariable)
2827 return llvm::GlobalVariable::WeakODRLinkage;
2829 return llvm::GlobalVariable::WeakAnyLinkage;
2832 // We are guaranteed to have a strong definition somewhere else,
2833 // so we can use available_externally linkage.
2834 if (Linkage == GVA_AvailableExternally)
2835 return llvm::GlobalValue::AvailableExternallyLinkage;
2837 // Note that Apple's kernel linker doesn't support symbol
2838 // coalescing, so we need to avoid linkonce and weak linkages there.
2839 // Normally, this means we just map to internal, but for explicit
2840 // instantiations we'll map to external.
2842 // In C++, the compiler has to emit a definition in every translation unit
2843 // that references the function. We should use linkonce_odr because
2844 // a) if all references in this translation unit are optimized away, we
2845 // don't need to codegen it. b) if the function persists, it needs to be
2846 // merged with other definitions. c) C++ has the ODR, so we know the
2847 // definition is dependable.
2848 if (Linkage == GVA_DiscardableODR)
2849 return !Context.getLangOpts().AppleKext ? llvm::Function::LinkOnceODRLinkage
2850 : llvm::Function::InternalLinkage;
2852 // An explicit instantiation of a template has weak linkage, since
2853 // explicit instantiations can occur in multiple translation units
2854 // and must all be equivalent. However, we are not allowed to
2855 // throw away these explicit instantiations.
2857 // We don't currently support CUDA device code spread out across multiple TUs,
2858 // so say that CUDA templates are either external (for kernels) or internal.
2859 // This lets llvm perform aggressive inter-procedural optimizations.
2860 if (Linkage == GVA_StrongODR) {
2861 if (Context.getLangOpts().AppleKext)
2862 return llvm::Function::ExternalLinkage;
2863 if (Context.getLangOpts().CUDA && Context.getLangOpts().CUDAIsDevice)
2864 return D->hasAttr<CUDAGlobalAttr>() ? llvm::Function::ExternalLinkage
2865 : llvm::Function::InternalLinkage;
2866 return llvm::Function::WeakODRLinkage;
2869 // C++ doesn't have tentative definitions and thus cannot have common
2871 if (!getLangOpts().CPlusPlus && isa<VarDecl>(D) &&
2872 !isVarDeclStrongDefinition(Context, *this, cast<VarDecl>(D),
2873 CodeGenOpts.NoCommon))
2874 return llvm::GlobalVariable::CommonLinkage;
2876 // selectany symbols are externally visible, so use weak instead of
2877 // linkonce. MSVC optimizes away references to const selectany globals, so
2878 // all definitions should be the same and ODR linkage should be used.
2879 // http://msdn.microsoft.com/en-us/library/5tkz6s71.aspx
2880 if (D->hasAttr<SelectAnyAttr>())
2881 return llvm::GlobalVariable::WeakODRLinkage;
2883 // Otherwise, we have strong external linkage.
2884 assert(Linkage == GVA_StrongExternal);
2885 return llvm::GlobalVariable::ExternalLinkage;
2888 llvm::GlobalValue::LinkageTypes CodeGenModule::getLLVMLinkageVarDefinition(
2889 const VarDecl *VD, bool IsConstant) {
2890 GVALinkage Linkage = getContext().GetGVALinkageForVariable(VD);
2891 return getLLVMLinkageForDeclarator(VD, Linkage, IsConstant);
2894 /// Replace the uses of a function that was declared with a non-proto type.
2895 /// We want to silently drop extra arguments from call sites
2896 static void replaceUsesOfNonProtoConstant(llvm::Constant *old,
2897 llvm::Function *newFn) {
2899 if (old->use_empty()) return;
2901 llvm::Type *newRetTy = newFn->getReturnType();
2902 SmallVector<llvm::Value*, 4> newArgs;
2903 SmallVector<llvm::OperandBundleDef, 1> newBundles;
2905 for (llvm::Value::use_iterator ui = old->use_begin(), ue = old->use_end();
2907 llvm::Value::use_iterator use = ui++; // Increment before the use is erased.
2908 llvm::User *user = use->getUser();
2910 // Recognize and replace uses of bitcasts. Most calls to
2911 // unprototyped functions will use bitcasts.
2912 if (auto *bitcast = dyn_cast<llvm::ConstantExpr>(user)) {
2913 if (bitcast->getOpcode() == llvm::Instruction::BitCast)
2914 replaceUsesOfNonProtoConstant(bitcast, newFn);
2918 // Recognize calls to the function.
2919 llvm::CallSite callSite(user);
2920 if (!callSite) continue;
2921 if (!callSite.isCallee(&*use)) continue;
2923 // If the return types don't match exactly, then we can't
2924 // transform this call unless it's dead.
2925 if (callSite->getType() != newRetTy && !callSite->use_empty())
2928 // Get the call site's attribute list.
2929 SmallVector<llvm::AttributeSet, 8> newArgAttrs;
2930 llvm::AttributeList oldAttrs = callSite.getAttributes();
2932 // If the function was passed too few arguments, don't transform.
2933 unsigned newNumArgs = newFn->arg_size();
2934 if (callSite.arg_size() < newNumArgs) continue;
2936 // If extra arguments were passed, we silently drop them.
2937 // If any of the types mismatch, we don't transform.
2939 bool dontTransform = false;
2940 for (llvm::Argument &A : newFn->args()) {
2941 if (callSite.getArgument(argNo)->getType() != A.getType()) {
2942 dontTransform = true;
2946 // Add any parameter attributes.
2947 newArgAttrs.push_back(oldAttrs.getParamAttributes(argNo));
2953 // Okay, we can transform this. Create the new call instruction and copy
2954 // over the required information.
2955 newArgs.append(callSite.arg_begin(), callSite.arg_begin() + argNo);
2957 // Copy over any operand bundles.
2958 callSite.getOperandBundlesAsDefs(newBundles);
2960 llvm::CallSite newCall;
2961 if (callSite.isCall()) {
2962 newCall = llvm::CallInst::Create(newFn, newArgs, newBundles, "",
2963 callSite.getInstruction());
2965 auto *oldInvoke = cast<llvm::InvokeInst>(callSite.getInstruction());
2966 newCall = llvm::InvokeInst::Create(newFn,
2967 oldInvoke->getNormalDest(),
2968 oldInvoke->getUnwindDest(),
2969 newArgs, newBundles, "",
2970 callSite.getInstruction());
2972 newArgs.clear(); // for the next iteration
2974 if (!newCall->getType()->isVoidTy())
2975 newCall->takeName(callSite.getInstruction());
2976 newCall.setAttributes(llvm::AttributeList::get(
2977 newFn->getContext(), oldAttrs.getFnAttributes(),
2978 oldAttrs.getRetAttributes(), newArgAttrs));
2979 newCall.setCallingConv(callSite.getCallingConv());
2981 // Finally, remove the old call, replacing any uses with the new one.
2982 if (!callSite->use_empty())
2983 callSite->replaceAllUsesWith(newCall.getInstruction());
2985 // Copy debug location attached to CI.
2986 if (callSite->getDebugLoc())
2987 newCall->setDebugLoc(callSite->getDebugLoc());
2989 callSite->eraseFromParent();
2993 /// ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we
2994 /// implement a function with no prototype, e.g. "int foo() {}". If there are
2995 /// existing call uses of the old function in the module, this adjusts them to
2996 /// call the new function directly.
2998 /// This is not just a cleanup: the always_inline pass requires direct calls to
2999 /// functions to be able to inline them. If there is a bitcast in the way, it
3000 /// won't inline them. Instcombine normally deletes these calls, but it isn't
3002 static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old,
3003 llvm::Function *NewFn) {
3004 // If we're redefining a global as a function, don't transform it.
3005 if (!isa<llvm::Function>(Old)) return;
3007 replaceUsesOfNonProtoConstant(Old, NewFn);
3010 void CodeGenModule::HandleCXXStaticMemberVarInstantiation(VarDecl *VD) {
3011 auto DK = VD->isThisDeclarationADefinition();
3012 if (DK == VarDecl::Definition && VD->hasAttr<DLLImportAttr>())
3015 TemplateSpecializationKind TSK = VD->getTemplateSpecializationKind();
3016 // If we have a definition, this might be a deferred decl. If the
3017 // instantiation is explicit, make sure we emit it at the end.
3018 if (VD->getDefinition() && TSK == TSK_ExplicitInstantiationDefinition)
3019 GetAddrOfGlobalVar(VD);
3021 EmitTopLevelDecl(VD);
3024 void CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD,
3025 llvm::GlobalValue *GV) {
3026 const auto *D = cast<FunctionDecl>(GD.getDecl());
3028 // Compute the function info and LLVM type.
3029 const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
3030 llvm::FunctionType *Ty = getTypes().GetFunctionType(FI);
3032 // Get or create the prototype for the function.
3033 if (!GV || (GV->getType()->getElementType() != Ty))
3034 GV = cast<llvm::GlobalValue>(GetAddrOfFunction(GD, Ty, /*ForVTable=*/false,
3039 if (!GV->isDeclaration())
3042 // We need to set linkage and visibility on the function before
3043 // generating code for it because various parts of IR generation
3044 // want to propagate this information down (e.g. to local static
3046 auto *Fn = cast<llvm::Function>(GV);
3047 setFunctionLinkage(GD, Fn);
3048 setFunctionDLLStorageClass(GD, Fn);
3050 // FIXME: this is redundant with part of setFunctionDefinitionAttributes
3051 setGlobalVisibility(Fn, D);
3053 MaybeHandleStaticInExternC(D, Fn);
3055 maybeSetTrivialComdat(*D, *Fn);
3057 CodeGenFunction(*this).GenerateCode(D, Fn, FI);
3059 setFunctionDefinitionAttributes(D, Fn);
3060 SetLLVMFunctionAttributesForDefinition(D, Fn);
3062 if (const ConstructorAttr *CA = D->getAttr<ConstructorAttr>())
3063 AddGlobalCtor(Fn, CA->getPriority());
3064 if (const DestructorAttr *DA = D->getAttr<DestructorAttr>())
3065 AddGlobalDtor(Fn, DA->getPriority());
3066 if (D->hasAttr<AnnotateAttr>())
3067 AddGlobalAnnotations(D, Fn);
3070 void CodeGenModule::EmitAliasDefinition(GlobalDecl GD) {
3071 const auto *D = cast<ValueDecl>(GD.getDecl());
3072 const AliasAttr *AA = D->getAttr<AliasAttr>();
3073 assert(AA && "Not an alias?");
3075 StringRef MangledName = getMangledName(GD);
3077 if (AA->getAliasee() == MangledName) {
3078 Diags.Report(AA->getLocation(), diag::err_cyclic_alias) << 0;
3082 // If there is a definition in the module, then it wins over the alias.
3083 // This is dubious, but allow it to be safe. Just ignore the alias.
3084 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
3085 if (Entry && !Entry->isDeclaration())
3088 Aliases.push_back(GD);
3090 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType());
3092 // Create a reference to the named value. This ensures that it is emitted
3093 // if a deferred decl.
3094 llvm::Constant *Aliasee;
3095 if (isa<llvm::FunctionType>(DeclTy))
3096 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy, GD,
3097 /*ForVTable=*/false);
3099 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
3100 llvm::PointerType::getUnqual(DeclTy),
3103 // Create the new alias itself, but don't set a name yet.
3104 auto *GA = llvm::GlobalAlias::create(
3105 DeclTy, 0, llvm::Function::ExternalLinkage, "", Aliasee, &getModule());
3108 if (GA->getAliasee() == Entry) {
3109 Diags.Report(AA->getLocation(), diag::err_cyclic_alias) << 0;
3113 assert(Entry->isDeclaration());
3115 // If there is a declaration in the module, then we had an extern followed
3116 // by the alias, as in:
3117 // extern int test6();
3119 // int test6() __attribute__((alias("test7")));
3121 // Remove it and replace uses of it with the alias.
3122 GA->takeName(Entry);
3124 Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GA,
3126 Entry->eraseFromParent();
3128 GA->setName(MangledName);
3131 // Set attributes which are particular to an alias; this is a
3132 // specialization of the attributes which may be set on a global
3133 // variable/function.
3134 if (D->hasAttr<WeakAttr>() || D->hasAttr<WeakRefAttr>() ||
3135 D->isWeakImported()) {
3136 GA->setLinkage(llvm::Function::WeakAnyLinkage);
3139 if (const auto *VD = dyn_cast<VarDecl>(D))
3140 if (VD->getTLSKind())
3141 setTLSMode(GA, *VD);
3143 setAliasAttributes(D, GA);
3146 void CodeGenModule::emitIFuncDefinition(GlobalDecl GD) {
3147 const auto *D = cast<ValueDecl>(GD.getDecl());
3148 const IFuncAttr *IFA = D->getAttr<IFuncAttr>();
3149 assert(IFA && "Not an ifunc?");
3151 StringRef MangledName = getMangledName(GD);
3153 if (IFA->getResolver() == MangledName) {
3154 Diags.Report(IFA->getLocation(), diag::err_cyclic_alias) << 1;
3158 // Report an error if some definition overrides ifunc.
3159 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
3160 if (Entry && !Entry->isDeclaration()) {
3162 if (lookupRepresentativeDecl(MangledName, OtherGD) &&
3163 DiagnosedConflictingDefinitions.insert(GD).second) {
3164 Diags.Report(D->getLocation(), diag::err_duplicate_mangled_name);
3165 Diags.Report(OtherGD.getDecl()->getLocation(),
3166 diag::note_previous_definition);
3171 Aliases.push_back(GD);
3173 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType());
3174 llvm::Constant *Resolver =
3175 GetOrCreateLLVMFunction(IFA->getResolver(), DeclTy, GD,
3176 /*ForVTable=*/false);
3177 llvm::GlobalIFunc *GIF =
3178 llvm::GlobalIFunc::create(DeclTy, 0, llvm::Function::ExternalLinkage,
3179 "", Resolver, &getModule());
3181 if (GIF->getResolver() == Entry) {
3182 Diags.Report(IFA->getLocation(), diag::err_cyclic_alias) << 1;
3185 assert(Entry->isDeclaration());
3187 // If there is a declaration in the module, then we had an extern followed
3188 // by the ifunc, as in:
3189 // extern int test();
3191 // int test() __attribute__((ifunc("resolver")));
3193 // Remove it and replace uses of it with the ifunc.
3194 GIF->takeName(Entry);
3196 Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GIF,
3198 Entry->eraseFromParent();
3200 GIF->setName(MangledName);
3202 SetCommonAttributes(D, GIF);
3205 llvm::Function *CodeGenModule::getIntrinsic(unsigned IID,
3206 ArrayRef<llvm::Type*> Tys) {
3207 return llvm::Intrinsic::getDeclaration(&getModule(), (llvm::Intrinsic::ID)IID,
3211 static llvm::StringMapEntry<llvm::GlobalVariable *> &
3212 GetConstantCFStringEntry(llvm::StringMap<llvm::GlobalVariable *> &Map,
3213 const StringLiteral *Literal, bool TargetIsLSB,
3214 bool &IsUTF16, unsigned &StringLength) {
3215 StringRef String = Literal->getString();
3216 unsigned NumBytes = String.size();
3218 // Check for simple case.
3219 if (!Literal->containsNonAsciiOrNull()) {
3220 StringLength = NumBytes;
3221 return *Map.insert(std::make_pair(String, nullptr)).first;
3224 // Otherwise, convert the UTF8 literals into a string of shorts.
3227 SmallVector<llvm::UTF16, 128> ToBuf(NumBytes + 1); // +1 for ending nulls.
3228 const llvm::UTF8 *FromPtr = (const llvm::UTF8 *)String.data();
3229 llvm::UTF16 *ToPtr = &ToBuf[0];
3231 (void)llvm::ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes, &ToPtr,
3232 ToPtr + NumBytes, llvm::strictConversion);
3234 // ConvertUTF8toUTF16 returns the length in ToPtr.
3235 StringLength = ToPtr - &ToBuf[0];
3237 // Add an explicit null.
3239 return *Map.insert(std::make_pair(
3240 StringRef(reinterpret_cast<const char *>(ToBuf.data()),
3241 (StringLength + 1) * 2),
3246 CodeGenModule::GetAddrOfConstantCFString(const StringLiteral *Literal) {
3247 unsigned StringLength = 0;
3248 bool isUTF16 = false;
3249 llvm::StringMapEntry<llvm::GlobalVariable *> &Entry =
3250 GetConstantCFStringEntry(CFConstantStringMap, Literal,
3251 getDataLayout().isLittleEndian(), isUTF16,
3254 if (auto *C = Entry.second)
3255 return ConstantAddress(C, CharUnits::fromQuantity(C->getAlignment()));
3257 llvm::Constant *Zero = llvm::Constant::getNullValue(Int32Ty);
3258 llvm::Constant *Zeros[] = { Zero, Zero };
3260 // If we don't already have it, get __CFConstantStringClassReference.
3261 if (!CFConstantStringClassRef) {
3262 llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy);
3263 Ty = llvm::ArrayType::get(Ty, 0);
3264 llvm::Constant *GV =
3265 CreateRuntimeVariable(Ty, "__CFConstantStringClassReference");
3267 if (getTriple().isOSBinFormatCOFF()) {
3268 IdentifierInfo &II = getContext().Idents.get(GV->getName());
3269 TranslationUnitDecl *TUDecl = getContext().getTranslationUnitDecl();
3270 DeclContext *DC = TranslationUnitDecl::castToDeclContext(TUDecl);
3271 llvm::GlobalValue *CGV = cast<llvm::GlobalValue>(GV);
3273 const VarDecl *VD = nullptr;
3274 for (const auto &Result : DC->lookup(&II))
3275 if ((VD = dyn_cast<VarDecl>(Result)))
3278 if (!VD || !VD->hasAttr<DLLExportAttr>()) {
3279 CGV->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
3280 CGV->setLinkage(llvm::GlobalValue::ExternalLinkage);
3282 CGV->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
3283 CGV->setLinkage(llvm::GlobalValue::ExternalLinkage);
3287 // Decay array -> ptr
3288 CFConstantStringClassRef =
3289 llvm::ConstantExpr::getGetElementPtr(Ty, GV, Zeros);
3292 QualType CFTy = getContext().getCFConstantStringType();
3294 auto *STy = cast<llvm::StructType>(getTypes().ConvertType(CFTy));
3296 ConstantInitBuilder Builder(*this);
3297 auto Fields = Builder.beginStruct(STy);
3300 Fields.add(cast<llvm::ConstantExpr>(CFConstantStringClassRef));
3303 Fields.addInt(IntTy, isUTF16 ? 0x07d0 : 0x07C8);
3306 llvm::Constant *C = nullptr;
3308 auto Arr = llvm::makeArrayRef(
3309 reinterpret_cast<uint16_t *>(const_cast<char *>(Entry.first().data())),
3310 Entry.first().size() / 2);
3311 C = llvm::ConstantDataArray::get(VMContext, Arr);
3313 C = llvm::ConstantDataArray::getString(VMContext, Entry.first());
3316 // Note: -fwritable-strings doesn't make the backing store strings of
3317 // CFStrings writable. (See <rdar://problem/10657500>)
3319 new llvm::GlobalVariable(getModule(), C->getType(), /*isConstant=*/true,
3320 llvm::GlobalValue::PrivateLinkage, C, ".str");
3321 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
3322 // Don't enforce the target's minimum global alignment, since the only use
3323 // of the string is via this class initializer.
3324 CharUnits Align = isUTF16
3325 ? getContext().getTypeAlignInChars(getContext().ShortTy)
3326 : getContext().getTypeAlignInChars(getContext().CharTy);
3327 GV->setAlignment(Align.getQuantity());
3329 // FIXME: We set the section explicitly to avoid a bug in ld64 224.1.
3330 // Without it LLVM can merge the string with a non unnamed_addr one during
3331 // LTO. Doing that changes the section it ends in, which surprises ld64.
3332 if (getTriple().isOSBinFormatMachO())
3333 GV->setSection(isUTF16 ? "__TEXT,__ustring"
3334 : "__TEXT,__cstring,cstring_literals");
3337 llvm::Constant *Str =
3338 llvm::ConstantExpr::getGetElementPtr(GV->getValueType(), GV, Zeros);
3341 // Cast the UTF16 string to the correct type.
3342 Str = llvm::ConstantExpr::getBitCast(Str, Int8PtrTy);
3346 auto Ty = getTypes().ConvertType(getContext().LongTy);
3347 Fields.addInt(cast<llvm::IntegerType>(Ty), StringLength);
3349 CharUnits Alignment = getPointerAlign();
3352 GV = Fields.finishAndCreateGlobal("_unnamed_cfstring_", Alignment,
3353 /*isConstant=*/false,
3354 llvm::GlobalVariable::PrivateLinkage);
3355 switch (getTriple().getObjectFormat()) {
3356 case llvm::Triple::UnknownObjectFormat:
3357 llvm_unreachable("unknown file format");
3358 case llvm::Triple::COFF:
3359 case llvm::Triple::ELF:
3360 case llvm::Triple::Wasm:
3361 GV->setSection("cfstring");
3363 case llvm::Triple::MachO:
3364 GV->setSection("__DATA,__cfstring");
3369 return ConstantAddress(GV, Alignment);
3372 QualType CodeGenModule::getObjCFastEnumerationStateType() {
3373 if (ObjCFastEnumerationStateType.isNull()) {
3374 RecordDecl *D = Context.buildImplicitRecord("__objcFastEnumerationState");
3375 D->startDefinition();
3377 QualType FieldTypes[] = {
3378 Context.UnsignedLongTy,
3379 Context.getPointerType(Context.getObjCIdType()),
3380 Context.getPointerType(Context.UnsignedLongTy),
3381 Context.getConstantArrayType(Context.UnsignedLongTy,
3382 llvm::APInt(32, 5), ArrayType::Normal, 0)
3385 for (size_t i = 0; i < 4; ++i) {
3386 FieldDecl *Field = FieldDecl::Create(Context,
3389 SourceLocation(), nullptr,
3390 FieldTypes[i], /*TInfo=*/nullptr,
3391 /*BitWidth=*/nullptr,
3394 Field->setAccess(AS_public);
3398 D->completeDefinition();
3399 ObjCFastEnumerationStateType = Context.getTagDeclType(D);
3402 return ObjCFastEnumerationStateType;
3406 CodeGenModule::GetConstantArrayFromStringLiteral(const StringLiteral *E) {
3407 assert(!E->getType()->isPointerType() && "Strings are always arrays");
3409 // Don't emit it as the address of the string, emit the string data itself
3410 // as an inline array.
3411 if (E->getCharByteWidth() == 1) {
3412 SmallString<64> Str(E->getString());
3414 // Resize the string to the right size, which is indicated by its type.
3415 const ConstantArrayType *CAT = Context.getAsConstantArrayType(E->getType());
3416 Str.resize(CAT->getSize().getZExtValue());
3417 return llvm::ConstantDataArray::getString(VMContext, Str, false);
3420 auto *AType = cast<llvm::ArrayType>(getTypes().ConvertType(E->getType()));
3421 llvm::Type *ElemTy = AType->getElementType();
3422 unsigned NumElements = AType->getNumElements();
3424 // Wide strings have either 2-byte or 4-byte elements.
3425 if (ElemTy->getPrimitiveSizeInBits() == 16) {
3426 SmallVector<uint16_t, 32> Elements;
3427 Elements.reserve(NumElements);
3429 for(unsigned i = 0, e = E->getLength(); i != e; ++i)
3430 Elements.push_back(E->getCodeUnit(i));
3431 Elements.resize(NumElements);
3432 return llvm::ConstantDataArray::get(VMContext, Elements);
3435 assert(ElemTy->getPrimitiveSizeInBits() == 32);
3436 SmallVector<uint32_t, 32> Elements;
3437 Elements.reserve(NumElements);
3439 for(unsigned i = 0, e = E->getLength(); i != e; ++i)
3440 Elements.push_back(E->getCodeUnit(i));
3441 Elements.resize(NumElements);
3442 return llvm::ConstantDataArray::get(VMContext, Elements);
3445 static llvm::GlobalVariable *
3446 GenerateStringLiteral(llvm::Constant *C, llvm::GlobalValue::LinkageTypes LT,
3447 CodeGenModule &CGM, StringRef GlobalName,
3448 CharUnits Alignment) {
3449 // OpenCL v1.2 s6.5.3: a string literal is in the constant address space.
3450 unsigned AddrSpace = 0;
3451 if (CGM.getLangOpts().OpenCL)
3452 AddrSpace = CGM.getContext().getTargetAddressSpace(LangAS::opencl_constant);
3454 llvm::Module &M = CGM.getModule();
3455 // Create a global variable for this string
3456 auto *GV = new llvm::GlobalVariable(
3457 M, C->getType(), !CGM.getLangOpts().WritableStrings, LT, C, GlobalName,
3458 nullptr, llvm::GlobalVariable::NotThreadLocal, AddrSpace);
3459 GV->setAlignment(Alignment.getQuantity());
3460 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
3461 if (GV->isWeakForLinker()) {
3462 assert(CGM.supportsCOMDAT() && "Only COFF uses weak string literals");
3463 GV->setComdat(M.getOrInsertComdat(GV->getName()));
3469 /// GetAddrOfConstantStringFromLiteral - Return a pointer to a
3470 /// constant array for the given string literal.
3472 CodeGenModule::GetAddrOfConstantStringFromLiteral(const StringLiteral *S,
3474 CharUnits Alignment = getContext().getAlignOfGlobalVarInChars(S->getType());
3476 llvm::Constant *C = GetConstantArrayFromStringLiteral(S);
3477 llvm::GlobalVariable **Entry = nullptr;
3478 if (!LangOpts.WritableStrings) {
3479 Entry = &ConstantStringMap[C];
3480 if (auto GV = *Entry) {
3481 if (Alignment.getQuantity() > GV->getAlignment())
3482 GV->setAlignment(Alignment.getQuantity());
3483 return ConstantAddress(GV, Alignment);
3487 SmallString<256> MangledNameBuffer;
3488 StringRef GlobalVariableName;
3489 llvm::GlobalValue::LinkageTypes LT;
3491 // Mangle the string literal if the ABI allows for it. However, we cannot
3492 // do this if we are compiling with ASan or -fwritable-strings because they
3493 // rely on strings having normal linkage.
3494 if (!LangOpts.WritableStrings &&
3495 !LangOpts.Sanitize.has(SanitizerKind::Address) &&
3496 getCXXABI().getMangleContext().shouldMangleStringLiteral(S)) {
3497 llvm::raw_svector_ostream Out(MangledNameBuffer);
3498 getCXXABI().getMangleContext().mangleStringLiteral(S, Out);
3500 LT = llvm::GlobalValue::LinkOnceODRLinkage;
3501 GlobalVariableName = MangledNameBuffer;
3503 LT = llvm::GlobalValue::PrivateLinkage;
3504 GlobalVariableName = Name;
3507 auto GV = GenerateStringLiteral(C, LT, *this, GlobalVariableName, Alignment);
3511 SanitizerMD->reportGlobalToASan(GV, S->getStrTokenLoc(0), "<string literal>",
3513 return ConstantAddress(GV, Alignment);
3516 /// GetAddrOfConstantStringFromObjCEncode - Return a pointer to a constant
3517 /// array for the given ObjCEncodeExpr node.
3519 CodeGenModule::GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *E) {
3521 getContext().getObjCEncodingForType(E->getEncodedType(), Str);
3523 return GetAddrOfConstantCString(Str);
3526 /// GetAddrOfConstantCString - Returns a pointer to a character array containing
3527 /// the literal and a terminating '\0' character.
3528 /// The result has pointer to array type.
3529 ConstantAddress CodeGenModule::GetAddrOfConstantCString(
3530 const std::string &Str, const char *GlobalName) {
3531 StringRef StrWithNull(Str.c_str(), Str.size() + 1);
3532 CharUnits Alignment =
3533 getContext().getAlignOfGlobalVarInChars(getContext().CharTy);
3536 llvm::ConstantDataArray::getString(getLLVMContext(), StrWithNull, false);
3538 // Don't share any string literals if strings aren't constant.
3539 llvm::GlobalVariable **Entry = nullptr;
3540 if (!LangOpts.WritableStrings) {
3541 Entry = &ConstantStringMap[C];
3542 if (auto GV = *Entry) {
3543 if (Alignment.getQuantity() > GV->getAlignment())
3544 GV->setAlignment(Alignment.getQuantity());
3545 return ConstantAddress(GV, Alignment);
3549 // Get the default prefix if a name wasn't specified.
3551 GlobalName = ".str";
3552 // Create a global variable for this.
3553 auto GV = GenerateStringLiteral(C, llvm::GlobalValue::PrivateLinkage, *this,
3554 GlobalName, Alignment);
3557 return ConstantAddress(GV, Alignment);
3560 ConstantAddress CodeGenModule::GetAddrOfGlobalTemporary(
3561 const MaterializeTemporaryExpr *E, const Expr *Init) {
3562 assert((E->getStorageDuration() == SD_Static ||
3563 E->getStorageDuration() == SD_Thread) && "not a global temporary");
3564 const auto *VD = cast<VarDecl>(E->getExtendingDecl());
3566 // If we're not materializing a subobject of the temporary, keep the
3567 // cv-qualifiers from the type of the MaterializeTemporaryExpr.
3568 QualType MaterializedType = Init->getType();
3569 if (Init == E->GetTemporaryExpr())
3570 MaterializedType = E->getType();
3572 CharUnits Align = getContext().getTypeAlignInChars(MaterializedType);
3574 if (llvm::Constant *Slot = MaterializedGlobalTemporaryMap[E])
3575 return ConstantAddress(Slot, Align);
3577 // FIXME: If an externally-visible declaration extends multiple temporaries,
3578 // we need to give each temporary the same name in every translation unit (and
3579 // we also need to make the temporaries externally-visible).
3580 SmallString<256> Name;
3581 llvm::raw_svector_ostream Out(Name);
3582 getCXXABI().getMangleContext().mangleReferenceTemporary(
3583 VD, E->getManglingNumber(), Out);
3585 APValue *Value = nullptr;
3586 if (E->getStorageDuration() == SD_Static) {
3587 // We might have a cached constant initializer for this temporary. Note
3588 // that this might have a different value from the value computed by
3589 // evaluating the initializer if the surrounding constant expression
3590 // modifies the temporary.
3591 Value = getContext().getMaterializedTemporaryValue(E, false);
3592 if (Value && Value->isUninit())
3596 // Try evaluating it now, it might have a constant initializer.
3597 Expr::EvalResult EvalResult;
3598 if (!Value && Init->EvaluateAsRValue(EvalResult, getContext()) &&
3599 !EvalResult.hasSideEffects())
3600 Value = &EvalResult.Val;
3602 llvm::Constant *InitialValue = nullptr;
3603 bool Constant = false;
3606 // The temporary has a constant initializer, use it.
3607 InitialValue = EmitConstantValue(*Value, MaterializedType, nullptr);
3608 Constant = isTypeConstant(MaterializedType, /*ExcludeCtor*/Value);
3609 Type = InitialValue->getType();
3611 // No initializer, the initialization will be provided when we
3612 // initialize the declaration which performed lifetime extension.
3613 Type = getTypes().ConvertTypeForMem(MaterializedType);
3616 // Create a global variable for this lifetime-extended temporary.
3617 llvm::GlobalValue::LinkageTypes Linkage =
3618 getLLVMLinkageVarDefinition(VD, Constant);
3619 if (Linkage == llvm::GlobalVariable::ExternalLinkage) {
3620 const VarDecl *InitVD;
3621 if (VD->isStaticDataMember() && VD->getAnyInitializer(InitVD) &&
3622 isa<CXXRecordDecl>(InitVD->getLexicalDeclContext())) {
3623 // Temporaries defined inside a class get linkonce_odr linkage because the
3624 // class can be defined in multipe translation units.
3625 Linkage = llvm::GlobalVariable::LinkOnceODRLinkage;
3627 // There is no need for this temporary to have external linkage if the
3628 // VarDecl has external linkage.
3629 Linkage = llvm::GlobalVariable::InternalLinkage;
3632 unsigned AddrSpace = GetGlobalVarAddressSpace(
3633 VD, getContext().getTargetAddressSpace(MaterializedType));
3634 auto *GV = new llvm::GlobalVariable(
3635 getModule(), Type, Constant, Linkage, InitialValue, Name.c_str(),
3636 /*InsertBefore=*/nullptr, llvm::GlobalVariable::NotThreadLocal,
3638 setGlobalVisibility(GV, VD);
3639 GV->setAlignment(Align.getQuantity());
3640 if (supportsCOMDAT() && GV->isWeakForLinker())
3641 GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
3642 if (VD->getTLSKind())
3643 setTLSMode(GV, *VD);
3644 MaterializedGlobalTemporaryMap[E] = GV;
3645 return ConstantAddress(GV, Align);
3648 /// EmitObjCPropertyImplementations - Emit information for synthesized
3649 /// properties for an implementation.
3650 void CodeGenModule::EmitObjCPropertyImplementations(const
3651 ObjCImplementationDecl *D) {
3652 for (const auto *PID : D->property_impls()) {
3653 // Dynamic is just for type-checking.
3654 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) {
3655 ObjCPropertyDecl *PD = PID->getPropertyDecl();
3657 // Determine which methods need to be implemented, some may have
3658 // been overridden. Note that ::isPropertyAccessor is not the method
3659 // we want, that just indicates if the decl came from a
3660 // property. What we want to know is if the method is defined in
3661 // this implementation.
3662 if (!D->getInstanceMethod(PD->getGetterName()))
3663 CodeGenFunction(*this).GenerateObjCGetter(
3664 const_cast<ObjCImplementationDecl *>(D), PID);
3665 if (!PD->isReadOnly() &&
3666 !D->getInstanceMethod(PD->getSetterName()))
3667 CodeGenFunction(*this).GenerateObjCSetter(
3668 const_cast<ObjCImplementationDecl *>(D), PID);
3673 static bool needsDestructMethod(ObjCImplementationDecl *impl) {
3674 const ObjCInterfaceDecl *iface = impl->getClassInterface();
3675 for (const ObjCIvarDecl *ivar = iface->all_declared_ivar_begin();
3676 ivar; ivar = ivar->getNextIvar())
3677 if (ivar->getType().isDestructedType())
3683 static bool AllTrivialInitializers(CodeGenModule &CGM,
3684 ObjCImplementationDecl *D) {
3685 CodeGenFunction CGF(CGM);
3686 for (ObjCImplementationDecl::init_iterator B = D->init_begin(),
3687 E = D->init_end(); B != E; ++B) {
3688 CXXCtorInitializer *CtorInitExp = *B;
3689 Expr *Init = CtorInitExp->getInit();
3690 if (!CGF.isTrivialInitializer(Init))
3696 /// EmitObjCIvarInitializations - Emit information for ivar initialization
3697 /// for an implementation.
3698 void CodeGenModule::EmitObjCIvarInitializations(ObjCImplementationDecl *D) {
3699 // We might need a .cxx_destruct even if we don't have any ivar initializers.
3700 if (needsDestructMethod(D)) {
3701 IdentifierInfo *II = &getContext().Idents.get(".cxx_destruct");
3702 Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
3703 ObjCMethodDecl *DTORMethod =
3704 ObjCMethodDecl::Create(getContext(), D->getLocation(), D->getLocation(),
3705 cxxSelector, getContext().VoidTy, nullptr, D,
3706 /*isInstance=*/true, /*isVariadic=*/false,
3707 /*isPropertyAccessor=*/true, /*isImplicitlyDeclared=*/true,
3708 /*isDefined=*/false, ObjCMethodDecl::Required);
3709 D->addInstanceMethod(DTORMethod);
3710 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, DTORMethod, false);
3711 D->setHasDestructors(true);
3714 // If the implementation doesn't have any ivar initializers, we don't need
3715 // a .cxx_construct.
3716 if (D->getNumIvarInitializers() == 0 ||
3717 AllTrivialInitializers(*this, D))
3720 IdentifierInfo *II = &getContext().Idents.get(".cxx_construct");
3721 Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
3722 // The constructor returns 'self'.
3723 ObjCMethodDecl *CTORMethod = ObjCMethodDecl::Create(getContext(),
3727 getContext().getObjCIdType(),
3728 nullptr, D, /*isInstance=*/true,
3729 /*isVariadic=*/false,
3730 /*isPropertyAccessor=*/true,
3731 /*isImplicitlyDeclared=*/true,
3732 /*isDefined=*/false,
3733 ObjCMethodDecl::Required);
3734 D->addInstanceMethod(CTORMethod);
3735 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, CTORMethod, true);
3736 D->setHasNonZeroConstructors(true);
3739 // EmitLinkageSpec - Emit all declarations in a linkage spec.
3740 void CodeGenModule::EmitLinkageSpec(const LinkageSpecDecl *LSD) {
3741 if (LSD->getLanguage() != LinkageSpecDecl::lang_c &&
3742 LSD->getLanguage() != LinkageSpecDecl::lang_cxx) {
3743 ErrorUnsupported(LSD, "linkage spec");
3747 EmitDeclContext(LSD);
3750 void CodeGenModule::EmitDeclContext(const DeclContext *DC) {
3751 for (auto *I : DC->decls()) {
3752 // Unlike other DeclContexts, the contents of an ObjCImplDecl at TU scope
3753 // are themselves considered "top-level", so EmitTopLevelDecl on an
3754 // ObjCImplDecl does not recursively visit them. We need to do that in
3755 // case they're nested inside another construct (LinkageSpecDecl /
3756 // ExportDecl) that does stop them from being considered "top-level".
3757 if (auto *OID = dyn_cast<ObjCImplDecl>(I)) {
3758 for (auto *M : OID->methods())
3759 EmitTopLevelDecl(M);
3762 EmitTopLevelDecl(I);
3766 /// EmitTopLevelDecl - Emit code for a single top level declaration.
3767 void CodeGenModule::EmitTopLevelDecl(Decl *D) {
3768 // Ignore dependent declarations.
3769 if (D->getDeclContext() && D->getDeclContext()->isDependentContext())
3772 switch (D->getKind()) {
3773 case Decl::CXXConversion:
3774 case Decl::CXXMethod:
3775 case Decl::Function:
3776 // Skip function templates
3777 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() ||
3778 cast<FunctionDecl>(D)->isLateTemplateParsed())
3781 EmitGlobal(cast<FunctionDecl>(D));
3782 // Always provide some coverage mapping
3783 // even for the functions that aren't emitted.
3784 AddDeferredUnusedCoverageMapping(D);
3787 case Decl::CXXDeductionGuide:
3788 // Function-like, but does not result in code emission.
3792 case Decl::Decomposition:
3793 // Skip variable templates
3794 if (cast<VarDecl>(D)->getDescribedVarTemplate())
3796 case Decl::VarTemplateSpecialization:
3797 EmitGlobal(cast<VarDecl>(D));
3798 if (auto *DD = dyn_cast<DecompositionDecl>(D))
3799 for (auto *B : DD->bindings())
3800 if (auto *HD = B->getHoldingVar())
3804 // Indirect fields from global anonymous structs and unions can be
3805 // ignored; only the actual variable requires IR gen support.
3806 case Decl::IndirectField:
3810 case Decl::Namespace:
3811 EmitDeclContext(cast<NamespaceDecl>(D));
3813 case Decl::CXXRecord:
3815 if (auto *ES = D->getASTContext().getExternalSource())
3816 if (ES->hasExternalDefinitions(D) == ExternalASTSource::EK_Never)
3817 DebugInfo->completeUnusedClass(cast<CXXRecordDecl>(*D));
3819 // Emit any static data members, they may be definitions.
3820 for (auto *I : cast<CXXRecordDecl>(D)->decls())
3821 if (isa<VarDecl>(I) || isa<CXXRecordDecl>(I))
3822 EmitTopLevelDecl(I);
3824 // No code generation needed.
3825 case Decl::UsingShadow:
3826 case Decl::ClassTemplate:
3827 case Decl::VarTemplate:
3828 case Decl::VarTemplatePartialSpecialization:
3829 case Decl::FunctionTemplate:
3830 case Decl::TypeAliasTemplate:
3834 case Decl::Using: // using X; [C++]
3835 if (CGDebugInfo *DI = getModuleDebugInfo())
3836 DI->EmitUsingDecl(cast<UsingDecl>(*D));
3838 case Decl::NamespaceAlias:
3839 if (CGDebugInfo *DI = getModuleDebugInfo())
3840 DI->EmitNamespaceAlias(cast<NamespaceAliasDecl>(*D));
3842 case Decl::UsingDirective: // using namespace X; [C++]
3843 if (CGDebugInfo *DI = getModuleDebugInfo())
3844 DI->EmitUsingDirective(cast<UsingDirectiveDecl>(*D));
3846 case Decl::CXXConstructor:
3847 // Skip function templates
3848 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() ||
3849 cast<FunctionDecl>(D)->isLateTemplateParsed())
3852 getCXXABI().EmitCXXConstructors(cast<CXXConstructorDecl>(D));
3854 case Decl::CXXDestructor:
3855 if (cast<FunctionDecl>(D)->isLateTemplateParsed())
3857 getCXXABI().EmitCXXDestructors(cast<CXXDestructorDecl>(D));
3860 case Decl::StaticAssert:
3864 // Objective-C Decls
3866 // Forward declarations, no (immediate) code generation.
3867 case Decl::ObjCInterface:
3868 case Decl::ObjCCategory:
3871 case Decl::ObjCProtocol: {
3872 auto *Proto = cast<ObjCProtocolDecl>(D);
3873 if (Proto->isThisDeclarationADefinition())
3874 ObjCRuntime->GenerateProtocol(Proto);
3878 case Decl::ObjCCategoryImpl:
3879 // Categories have properties but don't support synthesize so we
3880 // can ignore them here.
3881 ObjCRuntime->GenerateCategory(cast<ObjCCategoryImplDecl>(D));
3884 case Decl::ObjCImplementation: {
3885 auto *OMD = cast<ObjCImplementationDecl>(D);
3886 EmitObjCPropertyImplementations(OMD);
3887 EmitObjCIvarInitializations(OMD);
3888 ObjCRuntime->GenerateClass(OMD);
3889 // Emit global variable debug information.
3890 if (CGDebugInfo *DI = getModuleDebugInfo())
3891 if (getCodeGenOpts().getDebugInfo() >= codegenoptions::LimitedDebugInfo)
3892 DI->getOrCreateInterfaceType(getContext().getObjCInterfaceType(
3893 OMD->getClassInterface()), OMD->getLocation());
3896 case Decl::ObjCMethod: {
3897 auto *OMD = cast<ObjCMethodDecl>(D);
3898 // If this is not a prototype, emit the body.
3900 CodeGenFunction(*this).GenerateObjCMethod(OMD);
3903 case Decl::ObjCCompatibleAlias:
3904 ObjCRuntime->RegisterAlias(cast<ObjCCompatibleAliasDecl>(D));
3907 case Decl::PragmaComment: {
3908 const auto *PCD = cast<PragmaCommentDecl>(D);
3909 switch (PCD->getCommentKind()) {
3911 llvm_unreachable("unexpected pragma comment kind");
3913 AppendLinkerOptions(PCD->getArg());
3916 AddDependentLib(PCD->getArg());
3921 break; // We ignore all of these.
3926 case Decl::PragmaDetectMismatch: {
3927 const auto *PDMD = cast<PragmaDetectMismatchDecl>(D);
3928 AddDetectMismatch(PDMD->getName(), PDMD->getValue());
3932 case Decl::LinkageSpec:
3933 EmitLinkageSpec(cast<LinkageSpecDecl>(D));
3936 case Decl::FileScopeAsm: {
3937 // File-scope asm is ignored during device-side CUDA compilation.
3938 if (LangOpts.CUDA && LangOpts.CUDAIsDevice)
3940 // File-scope asm is ignored during device-side OpenMP compilation.
3941 if (LangOpts.OpenMPIsDevice)
3943 auto *AD = cast<FileScopeAsmDecl>(D);
3944 getModule().appendModuleInlineAsm(AD->getAsmString()->getString());
3948 case Decl::Import: {
3949 auto *Import = cast<ImportDecl>(D);
3951 // If we've already imported this module, we're done.
3952 if (!ImportedModules.insert(Import->getImportedModule()))
3955 // Emit debug information for direct imports.
3956 if (!Import->getImportedOwningModule()) {
3957 if (CGDebugInfo *DI = getModuleDebugInfo())
3958 DI->EmitImportDecl(*Import);
3961 // Find all of the submodules and emit the module initializers.
3962 llvm::SmallPtrSet<clang::Module *, 16> Visited;
3963 SmallVector<clang::Module *, 16> Stack;
3964 Visited.insert(Import->getImportedModule());
3965 Stack.push_back(Import->getImportedModule());
3967 while (!Stack.empty()) {
3968 clang::Module *Mod = Stack.pop_back_val();
3969 if (!EmittedModuleInitializers.insert(Mod).second)
3972 for (auto *D : Context.getModuleInitializers(Mod))
3973 EmitTopLevelDecl(D);
3975 // Visit the submodules of this module.
3976 for (clang::Module::submodule_iterator Sub = Mod->submodule_begin(),
3977 SubEnd = Mod->submodule_end();
3978 Sub != SubEnd; ++Sub) {
3979 // Skip explicit children; they need to be explicitly imported to emit
3980 // the initializers.
3981 if ((*Sub)->IsExplicit)
3984 if (Visited.insert(*Sub).second)
3985 Stack.push_back(*Sub);
3992 EmitDeclContext(cast<ExportDecl>(D));
3995 case Decl::OMPThreadPrivate:
3996 EmitOMPThreadPrivateDecl(cast<OMPThreadPrivateDecl>(D));
3999 case Decl::ClassTemplateSpecialization: {
4000 const auto *Spec = cast<ClassTemplateSpecializationDecl>(D);
4002 Spec->getSpecializationKind() == TSK_ExplicitInstantiationDefinition &&
4003 Spec->hasDefinition())
4004 DebugInfo->completeTemplateDefinition(*Spec);
4008 case Decl::OMPDeclareReduction:
4009 EmitOMPDeclareReduction(cast<OMPDeclareReductionDecl>(D));
4013 // Make sure we handled everything we should, every other kind is a
4014 // non-top-level decl. FIXME: Would be nice to have an isTopLevelDeclKind
4015 // function. Need to recode Decl::Kind to do that easily.
4016 assert(isa<TypeDecl>(D) && "Unsupported decl kind");
4021 void CodeGenModule::AddDeferredUnusedCoverageMapping(Decl *D) {
4022 // Do we need to generate coverage mapping?
4023 if (!CodeGenOpts.CoverageMapping)
4025 switch (D->getKind()) {
4026 case Decl::CXXConversion:
4027 case Decl::CXXMethod:
4028 case Decl::Function:
4029 case Decl::ObjCMethod:
4030 case Decl::CXXConstructor:
4031 case Decl::CXXDestructor: {
4032 if (!cast<FunctionDecl>(D)->doesThisDeclarationHaveABody())
4034 auto I = DeferredEmptyCoverageMappingDecls.find(D);
4035 if (I == DeferredEmptyCoverageMappingDecls.end())
4036 DeferredEmptyCoverageMappingDecls[D] = true;
4044 void CodeGenModule::ClearUnusedCoverageMapping(const Decl *D) {
4045 // Do we need to generate coverage mapping?
4046 if (!CodeGenOpts.CoverageMapping)
4048 if (const auto *Fn = dyn_cast<FunctionDecl>(D)) {
4049 if (Fn->isTemplateInstantiation())
4050 ClearUnusedCoverageMapping(Fn->getTemplateInstantiationPattern());
4052 auto I = DeferredEmptyCoverageMappingDecls.find(D);
4053 if (I == DeferredEmptyCoverageMappingDecls.end())
4054 DeferredEmptyCoverageMappingDecls[D] = false;
4059 void CodeGenModule::EmitDeferredUnusedCoverageMappings() {
4060 std::vector<const Decl *> DeferredDecls;
4061 for (const auto &I : DeferredEmptyCoverageMappingDecls) {
4064 DeferredDecls.push_back(I.first);
4066 // Sort the declarations by their location to make sure that the tests get a
4067 // predictable order for the coverage mapping for the unused declarations.
4068 if (CodeGenOpts.DumpCoverageMapping)
4069 std::sort(DeferredDecls.begin(), DeferredDecls.end(),
4070 [] (const Decl *LHS, const Decl *RHS) {
4071 return LHS->getLocStart() < RHS->getLocStart();
4073 for (const auto *D : DeferredDecls) {
4074 switch (D->getKind()) {
4075 case Decl::CXXConversion:
4076 case Decl::CXXMethod:
4077 case Decl::Function:
4078 case Decl::ObjCMethod: {
4079 CodeGenPGO PGO(*this);
4080 GlobalDecl GD(cast<FunctionDecl>(D));
4081 PGO.emitEmptyCounterMapping(D, getMangledName(GD),
4082 getFunctionLinkage(GD));
4085 case Decl::CXXConstructor: {
4086 CodeGenPGO PGO(*this);
4087 GlobalDecl GD(cast<CXXConstructorDecl>(D), Ctor_Base);
4088 PGO.emitEmptyCounterMapping(D, getMangledName(GD),
4089 getFunctionLinkage(GD));
4092 case Decl::CXXDestructor: {
4093 CodeGenPGO PGO(*this);
4094 GlobalDecl GD(cast<CXXDestructorDecl>(D), Dtor_Base);
4095 PGO.emitEmptyCounterMapping(D, getMangledName(GD),
4096 getFunctionLinkage(GD));
4105 /// Turns the given pointer into a constant.
4106 static llvm::Constant *GetPointerConstant(llvm::LLVMContext &Context,
4108 uintptr_t PtrInt = reinterpret_cast<uintptr_t>(Ptr);
4109 llvm::Type *i64 = llvm::Type::getInt64Ty(Context);
4110 return llvm::ConstantInt::get(i64, PtrInt);
4113 static void EmitGlobalDeclMetadata(CodeGenModule &CGM,
4114 llvm::NamedMDNode *&GlobalMetadata,
4116 llvm::GlobalValue *Addr) {
4117 if (!GlobalMetadata)
4119 CGM.getModule().getOrInsertNamedMetadata("clang.global.decl.ptrs");
4121 // TODO: should we report variant information for ctors/dtors?
4122 llvm::Metadata *Ops[] = {llvm::ConstantAsMetadata::get(Addr),
4123 llvm::ConstantAsMetadata::get(GetPointerConstant(
4124 CGM.getLLVMContext(), D.getDecl()))};
4125 GlobalMetadata->addOperand(llvm::MDNode::get(CGM.getLLVMContext(), Ops));
4128 /// For each function which is declared within an extern "C" region and marked
4129 /// as 'used', but has internal linkage, create an alias from the unmangled
4130 /// name to the mangled name if possible. People expect to be able to refer
4131 /// to such functions with an unmangled name from inline assembly within the
4132 /// same translation unit.
4133 void CodeGenModule::EmitStaticExternCAliases() {
4134 // Don't do anything if we're generating CUDA device code -- the NVPTX
4135 // assembly target doesn't support aliases.
4136 if (Context.getTargetInfo().getTriple().isNVPTX())
4138 for (auto &I : StaticExternCValues) {
4139 IdentifierInfo *Name = I.first;
4140 llvm::GlobalValue *Val = I.second;
4141 if (Val && !getModule().getNamedValue(Name->getName()))
4142 addUsedGlobal(llvm::GlobalAlias::create(Name->getName(), Val));
4146 bool CodeGenModule::lookupRepresentativeDecl(StringRef MangledName,
4147 GlobalDecl &Result) const {
4148 auto Res = Manglings.find(MangledName);
4149 if (Res == Manglings.end())
4151 Result = Res->getValue();
4155 /// Emits metadata nodes associating all the global values in the
4156 /// current module with the Decls they came from. This is useful for
4157 /// projects using IR gen as a subroutine.
4159 /// Since there's currently no way to associate an MDNode directly
4160 /// with an llvm::GlobalValue, we create a global named metadata
4161 /// with the name 'clang.global.decl.ptrs'.
4162 void CodeGenModule::EmitDeclMetadata() {
4163 llvm::NamedMDNode *GlobalMetadata = nullptr;
4165 for (auto &I : MangledDeclNames) {
4166 llvm::GlobalValue *Addr = getModule().getNamedValue(I.second);
4167 // Some mangled names don't necessarily have an associated GlobalValue
4168 // in this module, e.g. if we mangled it for DebugInfo.
4170 EmitGlobalDeclMetadata(*this, GlobalMetadata, I.first, Addr);
4174 /// Emits metadata nodes for all the local variables in the current
4176 void CodeGenFunction::EmitDeclMetadata() {
4177 if (LocalDeclMap.empty()) return;
4179 llvm::LLVMContext &Context = getLLVMContext();
4181 // Find the unique metadata ID for this name.
4182 unsigned DeclPtrKind = Context.getMDKindID("clang.decl.ptr");
4184 llvm::NamedMDNode *GlobalMetadata = nullptr;
4186 for (auto &I : LocalDeclMap) {
4187 const Decl *D = I.first;
4188 llvm::Value *Addr = I.second.getPointer();
4189 if (auto *Alloca = dyn_cast<llvm::AllocaInst>(Addr)) {
4190 llvm::Value *DAddr = GetPointerConstant(getLLVMContext(), D);
4191 Alloca->setMetadata(
4192 DeclPtrKind, llvm::MDNode::get(
4193 Context, llvm::ValueAsMetadata::getConstant(DAddr)));
4194 } else if (auto *GV = dyn_cast<llvm::GlobalValue>(Addr)) {
4195 GlobalDecl GD = GlobalDecl(cast<VarDecl>(D));
4196 EmitGlobalDeclMetadata(CGM, GlobalMetadata, GD, GV);
4201 void CodeGenModule::EmitVersionIdentMetadata() {
4202 llvm::NamedMDNode *IdentMetadata =
4203 TheModule.getOrInsertNamedMetadata("llvm.ident");
4204 std::string Version = getClangFullVersion();
4205 llvm::LLVMContext &Ctx = TheModule.getContext();
4207 llvm::Metadata *IdentNode[] = {llvm::MDString::get(Ctx, Version)};
4208 IdentMetadata->addOperand(llvm::MDNode::get(Ctx, IdentNode));
4211 void CodeGenModule::EmitTargetMetadata() {
4212 // Warning, new MangledDeclNames may be appended within this loop.
4213 // We rely on MapVector insertions adding new elements to the end
4214 // of the container.
4215 // FIXME: Move this loop into the one target that needs it, and only
4216 // loop over those declarations for which we couldn't emit the target
4217 // metadata when we emitted the declaration.
4218 for (unsigned I = 0; I != MangledDeclNames.size(); ++I) {
4219 auto Val = *(MangledDeclNames.begin() + I);
4220 const Decl *D = Val.first.getDecl()->getMostRecentDecl();
4221 llvm::GlobalValue *GV = GetGlobalValue(Val.second);
4222 getTargetCodeGenInfo().emitTargetMD(D, GV, *this);
4226 void CodeGenModule::EmitCoverageFile() {
4227 if (getCodeGenOpts().CoverageDataFile.empty() &&
4228 getCodeGenOpts().CoverageNotesFile.empty())
4231 llvm::NamedMDNode *CUNode = TheModule.getNamedMetadata("llvm.dbg.cu");
4235 llvm::NamedMDNode *GCov = TheModule.getOrInsertNamedMetadata("llvm.gcov");
4236 llvm::LLVMContext &Ctx = TheModule.getContext();
4237 auto *CoverageDataFile =
4238 llvm::MDString::get(Ctx, getCodeGenOpts().CoverageDataFile);
4239 auto *CoverageNotesFile =
4240 llvm::MDString::get(Ctx, getCodeGenOpts().CoverageNotesFile);
4241 for (int i = 0, e = CUNode->getNumOperands(); i != e; ++i) {
4242 llvm::MDNode *CU = CUNode->getOperand(i);
4243 llvm::Metadata *Elts[] = {CoverageNotesFile, CoverageDataFile, CU};
4244 GCov->addOperand(llvm::MDNode::get(Ctx, Elts));
4248 llvm::Constant *CodeGenModule::EmitUuidofInitializer(StringRef Uuid) {
4249 // Sema has checked that all uuid strings are of the form
4250 // "12345678-1234-1234-1234-1234567890ab".
4251 assert(Uuid.size() == 36);
4252 for (unsigned i = 0; i < 36; ++i) {
4253 if (i == 8 || i == 13 || i == 18 || i == 23) assert(Uuid[i] == '-');
4254 else assert(isHexDigit(Uuid[i]));
4257 // The starts of all bytes of Field3 in Uuid. Field 3 is "1234-1234567890ab".
4258 const unsigned Field3ValueOffsets[8] = { 19, 21, 24, 26, 28, 30, 32, 34 };
4260 llvm::Constant *Field3[8];
4261 for (unsigned Idx = 0; Idx < 8; ++Idx)
4262 Field3[Idx] = llvm::ConstantInt::get(
4263 Int8Ty, Uuid.substr(Field3ValueOffsets[Idx], 2), 16);
4265 llvm::Constant *Fields[4] = {
4266 llvm::ConstantInt::get(Int32Ty, Uuid.substr(0, 8), 16),
4267 llvm::ConstantInt::get(Int16Ty, Uuid.substr(9, 4), 16),
4268 llvm::ConstantInt::get(Int16Ty, Uuid.substr(14, 4), 16),
4269 llvm::ConstantArray::get(llvm::ArrayType::get(Int8Ty, 8), Field3)
4272 return llvm::ConstantStruct::getAnon(Fields);
4275 llvm::Constant *CodeGenModule::GetAddrOfRTTIDescriptor(QualType Ty,
4277 // Return a bogus pointer if RTTI is disabled, unless it's for EH.
4278 // FIXME: should we even be calling this method if RTTI is disabled
4279 // and it's not for EH?
4280 if (!ForEH && !getLangOpts().RTTI)
4281 return llvm::Constant::getNullValue(Int8PtrTy);
4283 if (ForEH && Ty->isObjCObjectPointerType() &&
4284 LangOpts.ObjCRuntime.isGNUFamily())
4285 return ObjCRuntime->GetEHType(Ty);
4287 return getCXXABI().getAddrOfRTTIDescriptor(Ty);
4290 void CodeGenModule::EmitOMPThreadPrivateDecl(const OMPThreadPrivateDecl *D) {
4291 for (auto RefExpr : D->varlists()) {
4292 auto *VD = cast<VarDecl>(cast<DeclRefExpr>(RefExpr)->getDecl());
4294 VD->getAnyInitializer() &&
4295 !VD->getAnyInitializer()->isConstantInitializer(getContext(),
4298 Address Addr(GetAddrOfGlobalVar(VD), getContext().getDeclAlign(VD));
4299 if (auto InitFunction = getOpenMPRuntime().emitThreadPrivateVarDefinition(
4300 VD, Addr, RefExpr->getLocStart(), PerformInit))
4301 CXXGlobalInits.push_back(InitFunction);
4305 llvm::Metadata *CodeGenModule::CreateMetadataIdentifierForType(QualType T) {
4306 llvm::Metadata *&InternalId = MetadataIdMap[T.getCanonicalType()];
4310 if (isExternallyVisible(T->getLinkage())) {
4311 std::string OutName;
4312 llvm::raw_string_ostream Out(OutName);
4313 getCXXABI().getMangleContext().mangleTypeName(T, Out);
4315 InternalId = llvm::MDString::get(getLLVMContext(), Out.str());
4317 InternalId = llvm::MDNode::getDistinct(getLLVMContext(),
4318 llvm::ArrayRef<llvm::Metadata *>());
4324 /// Returns whether this module needs the "all-vtables" type identifier.
4325 bool CodeGenModule::NeedAllVtablesTypeId() const {
4326 // Returns true if at least one of vtable-based CFI checkers is enabled and
4327 // is not in the trapping mode.
4328 return ((LangOpts.Sanitize.has(SanitizerKind::CFIVCall) &&
4329 !CodeGenOpts.SanitizeTrap.has(SanitizerKind::CFIVCall)) ||
4330 (LangOpts.Sanitize.has(SanitizerKind::CFINVCall) &&
4331 !CodeGenOpts.SanitizeTrap.has(SanitizerKind::CFINVCall)) ||
4332 (LangOpts.Sanitize.has(SanitizerKind::CFIDerivedCast) &&
4333 !CodeGenOpts.SanitizeTrap.has(SanitizerKind::CFIDerivedCast)) ||
4334 (LangOpts.Sanitize.has(SanitizerKind::CFIUnrelatedCast) &&
4335 !CodeGenOpts.SanitizeTrap.has(SanitizerKind::CFIUnrelatedCast)));
4338 void CodeGenModule::AddVTableTypeMetadata(llvm::GlobalVariable *VTable,
4340 const CXXRecordDecl *RD) {
4341 llvm::Metadata *MD =
4342 CreateMetadataIdentifierForType(QualType(RD->getTypeForDecl(), 0));
4343 VTable->addTypeMetadata(Offset.getQuantity(), MD);
4345 if (CodeGenOpts.SanitizeCfiCrossDso)
4346 if (auto CrossDsoTypeId = CreateCrossDsoCfiTypeId(MD))
4347 VTable->addTypeMetadata(Offset.getQuantity(),
4348 llvm::ConstantAsMetadata::get(CrossDsoTypeId));
4350 if (NeedAllVtablesTypeId()) {
4351 llvm::Metadata *MD = llvm::MDString::get(getLLVMContext(), "all-vtables");
4352 VTable->addTypeMetadata(Offset.getQuantity(), MD);
4356 // Fills in the supplied string map with the set of target features for the
4357 // passed in function.
4358 void CodeGenModule::getFunctionFeatureMap(llvm::StringMap<bool> &FeatureMap,
4359 const FunctionDecl *FD) {
4360 StringRef TargetCPU = Target.getTargetOpts().CPU;
4361 if (const auto *TD = FD->getAttr<TargetAttr>()) {
4362 // If we have a TargetAttr build up the feature map based on that.
4363 TargetAttr::ParsedTargetAttr ParsedAttr = TD->parse();
4365 // Make a copy of the features as passed on the command line into the
4366 // beginning of the additional features from the function to override.
4367 ParsedAttr.first.insert(ParsedAttr.first.begin(),
4368 Target.getTargetOpts().FeaturesAsWritten.begin(),
4369 Target.getTargetOpts().FeaturesAsWritten.end());
4371 if (ParsedAttr.second != "")
4372 TargetCPU = ParsedAttr.second;
4374 // Now populate the feature map, first with the TargetCPU which is either
4375 // the default or a new one from the target attribute string. Then we'll use
4376 // the passed in features (FeaturesAsWritten) along with the new ones from
4378 Target.initFeatureMap(FeatureMap, getDiags(), TargetCPU, ParsedAttr.first);
4380 Target.initFeatureMap(FeatureMap, getDiags(), TargetCPU,
4381 Target.getTargetOpts().Features);
4385 llvm::SanitizerStatReport &CodeGenModule::getSanStats() {
4387 SanStats = llvm::make_unique<llvm::SanitizerStatReport>(&getModule());
4392 CodeGenModule::createOpenCLIntToSamplerConversion(const Expr *E,
4393 CodeGenFunction &CGF) {
4394 llvm::Constant *C = EmitConstantExpr(E, E->getType(), &CGF);
4395 auto SamplerT = getOpenCLRuntime().getSamplerType();
4396 auto FTy = llvm::FunctionType::get(SamplerT, {C->getType()}, false);
4397 return CGF.Builder.CreateCall(CreateRuntimeFunction(FTy,
4398 "__translate_sampler_initializer"),