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 "ConstantBuilder.h"
28 #include "CoverageMappingGen.h"
29 #include "TargetInfo.h"
30 #include "clang/AST/ASTContext.h"
31 #include "clang/AST/CharUnits.h"
32 #include "clang/AST/DeclCXX.h"
33 #include "clang/AST/DeclObjC.h"
34 #include "clang/AST/DeclTemplate.h"
35 #include "clang/AST/Mangle.h"
36 #include "clang/AST/RecordLayout.h"
37 #include "clang/AST/RecursiveASTVisitor.h"
38 #include "clang/Basic/Builtins.h"
39 #include "clang/Basic/CharInfo.h"
40 #include "clang/Basic/Diagnostic.h"
41 #include "clang/Basic/Module.h"
42 #include "clang/Basic/SourceManager.h"
43 #include "clang/Basic/TargetInfo.h"
44 #include "clang/Basic/Version.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);
115 RuntimeCC = getTargetCodeGenInfo().getABIInfo().getRuntimeCC();
116 BuiltinCC = getTargetCodeGenInfo().getABIInfo().getBuiltinCC();
121 createOpenCLRuntime();
123 createOpenMPRuntime();
127 // Enable TBAA unless it's suppressed. ThreadSanitizer needs TBAA even at O0.
128 if (LangOpts.Sanitize.has(SanitizerKind::Thread) ||
129 (!CodeGenOpts.RelaxedAliasing && CodeGenOpts.OptimizationLevel > 0))
130 TBAA.reset(new CodeGenTBAA(Context, VMContext, CodeGenOpts, getLangOpts(),
131 getCXXABI().getMangleContext()));
133 // If debug info or coverage generation is enabled, create the CGDebugInfo
135 if (CodeGenOpts.getDebugInfo() != codegenoptions::NoDebugInfo ||
136 CodeGenOpts.EmitGcovArcs || CodeGenOpts.EmitGcovNotes)
137 DebugInfo.reset(new CGDebugInfo(*this));
139 Block.GlobalUniqueCount = 0;
141 if (C.getLangOpts().ObjC1)
142 ObjCData.reset(new ObjCEntrypoints());
144 if (CodeGenOpts.hasProfileClangUse()) {
145 auto ReaderOrErr = llvm::IndexedInstrProfReader::create(
146 CodeGenOpts.ProfileInstrumentUsePath);
147 if (auto E = ReaderOrErr.takeError()) {
148 unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
149 "Could not read profile %0: %1");
150 llvm::handleAllErrors(std::move(E), [&](const llvm::ErrorInfoBase &EI) {
151 getDiags().Report(DiagID) << CodeGenOpts.ProfileInstrumentUsePath
155 PGOReader = std::move(ReaderOrErr.get());
158 // If coverage mapping generation is enabled, create the
159 // CoverageMappingModuleGen object.
160 if (CodeGenOpts.CoverageMapping)
161 CoverageMapping.reset(new CoverageMappingModuleGen(*this, *CoverageInfo));
164 CodeGenModule::~CodeGenModule() {}
166 void CodeGenModule::createObjCRuntime() {
167 // This is just isGNUFamily(), but we want to force implementors of
168 // new ABIs to decide how best to do this.
169 switch (LangOpts.ObjCRuntime.getKind()) {
170 case ObjCRuntime::GNUstep:
171 case ObjCRuntime::GCC:
172 case ObjCRuntime::ObjFW:
173 ObjCRuntime.reset(CreateGNUObjCRuntime(*this));
176 case ObjCRuntime::FragileMacOSX:
177 case ObjCRuntime::MacOSX:
178 case ObjCRuntime::iOS:
179 case ObjCRuntime::WatchOS:
180 ObjCRuntime.reset(CreateMacObjCRuntime(*this));
183 llvm_unreachable("bad runtime kind");
186 void CodeGenModule::createOpenCLRuntime() {
187 OpenCLRuntime.reset(new CGOpenCLRuntime(*this));
190 void CodeGenModule::createOpenMPRuntime() {
191 // Select a specialized code generation class based on the target, if any.
192 // If it does not exist use the default implementation.
193 switch (getTriple().getArch()) {
194 case llvm::Triple::nvptx:
195 case llvm::Triple::nvptx64:
196 assert(getLangOpts().OpenMPIsDevice &&
197 "OpenMP NVPTX is only prepared to deal with device code.");
198 OpenMPRuntime.reset(new CGOpenMPRuntimeNVPTX(*this));
201 OpenMPRuntime.reset(new CGOpenMPRuntime(*this));
206 void CodeGenModule::createCUDARuntime() {
207 CUDARuntime.reset(CreateNVCUDARuntime(*this));
210 void CodeGenModule::addReplacement(StringRef Name, llvm::Constant *C) {
211 Replacements[Name] = C;
214 void CodeGenModule::applyReplacements() {
215 for (auto &I : Replacements) {
216 StringRef MangledName = I.first();
217 llvm::Constant *Replacement = I.second;
218 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
221 auto *OldF = cast<llvm::Function>(Entry);
222 auto *NewF = dyn_cast<llvm::Function>(Replacement);
224 if (auto *Alias = dyn_cast<llvm::GlobalAlias>(Replacement)) {
225 NewF = dyn_cast<llvm::Function>(Alias->getAliasee());
227 auto *CE = cast<llvm::ConstantExpr>(Replacement);
228 assert(CE->getOpcode() == llvm::Instruction::BitCast ||
229 CE->getOpcode() == llvm::Instruction::GetElementPtr);
230 NewF = dyn_cast<llvm::Function>(CE->getOperand(0));
234 // Replace old with new, but keep the old order.
235 OldF->replaceAllUsesWith(Replacement);
237 NewF->removeFromParent();
238 OldF->getParent()->getFunctionList().insertAfter(OldF->getIterator(),
241 OldF->eraseFromParent();
245 void CodeGenModule::addGlobalValReplacement(llvm::GlobalValue *GV, llvm::Constant *C) {
246 GlobalValReplacements.push_back(std::make_pair(GV, C));
249 void CodeGenModule::applyGlobalValReplacements() {
250 for (auto &I : GlobalValReplacements) {
251 llvm::GlobalValue *GV = I.first;
252 llvm::Constant *C = I.second;
254 GV->replaceAllUsesWith(C);
255 GV->eraseFromParent();
259 // This is only used in aliases that we created and we know they have a
261 static const llvm::GlobalObject *getAliasedGlobal(
262 const llvm::GlobalIndirectSymbol &GIS) {
263 llvm::SmallPtrSet<const llvm::GlobalIndirectSymbol*, 4> Visited;
264 const llvm::Constant *C = &GIS;
266 C = C->stripPointerCasts();
267 if (auto *GO = dyn_cast<llvm::GlobalObject>(C))
269 // stripPointerCasts will not walk over weak aliases.
270 auto *GIS2 = dyn_cast<llvm::GlobalIndirectSymbol>(C);
273 if (!Visited.insert(GIS2).second)
275 C = GIS2->getIndirectSymbol();
279 void CodeGenModule::checkAliases() {
280 // Check if the constructed aliases are well formed. It is really unfortunate
281 // that we have to do this in CodeGen, but we only construct mangled names
282 // and aliases during codegen.
284 DiagnosticsEngine &Diags = getDiags();
285 for (const GlobalDecl &GD : Aliases) {
286 const auto *D = cast<ValueDecl>(GD.getDecl());
287 SourceLocation Location;
288 bool IsIFunc = D->hasAttr<IFuncAttr>();
289 if (const Attr *A = D->getDefiningAttr())
290 Location = A->getLocation();
292 llvm_unreachable("Not an alias or ifunc?");
293 StringRef MangledName = getMangledName(GD);
294 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
295 auto *Alias = cast<llvm::GlobalIndirectSymbol>(Entry);
296 const llvm::GlobalValue *GV = getAliasedGlobal(*Alias);
299 Diags.Report(Location, diag::err_cyclic_alias) << IsIFunc;
300 } else if (GV->isDeclaration()) {
302 Diags.Report(Location, diag::err_alias_to_undefined)
303 << IsIFunc << IsIFunc;
304 } else if (IsIFunc) {
305 // Check resolver function type.
306 llvm::FunctionType *FTy = dyn_cast<llvm::FunctionType>(
307 GV->getType()->getPointerElementType());
309 if (!FTy->getReturnType()->isPointerTy())
310 Diags.Report(Location, diag::err_ifunc_resolver_return);
311 if (FTy->getNumParams())
312 Diags.Report(Location, diag::err_ifunc_resolver_params);
315 llvm::Constant *Aliasee = Alias->getIndirectSymbol();
316 llvm::GlobalValue *AliaseeGV;
317 if (auto CE = dyn_cast<llvm::ConstantExpr>(Aliasee))
318 AliaseeGV = cast<llvm::GlobalValue>(CE->getOperand(0));
320 AliaseeGV = cast<llvm::GlobalValue>(Aliasee);
322 if (const SectionAttr *SA = D->getAttr<SectionAttr>()) {
323 StringRef AliasSection = SA->getName();
324 if (AliasSection != AliaseeGV->getSection())
325 Diags.Report(SA->getLocation(), diag::warn_alias_with_section)
326 << AliasSection << IsIFunc << IsIFunc;
329 // We have to handle alias to weak aliases in here. LLVM itself disallows
330 // this since the object semantics would not match the IL one. For
331 // compatibility with gcc we implement it by just pointing the alias
332 // to its aliasee's aliasee. We also warn, since the user is probably
333 // expecting the link to be weak.
334 if (auto GA = dyn_cast<llvm::GlobalIndirectSymbol>(AliaseeGV)) {
335 if (GA->isInterposable()) {
336 Diags.Report(Location, diag::warn_alias_to_weak_alias)
337 << GV->getName() << GA->getName() << IsIFunc;
338 Aliasee = llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(
339 GA->getIndirectSymbol(), Alias->getType());
340 Alias->setIndirectSymbol(Aliasee);
347 for (const GlobalDecl &GD : Aliases) {
348 StringRef MangledName = getMangledName(GD);
349 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
350 auto *Alias = dyn_cast<llvm::GlobalIndirectSymbol>(Entry);
351 Alias->replaceAllUsesWith(llvm::UndefValue::get(Alias->getType()));
352 Alias->eraseFromParent();
356 void CodeGenModule::clear() {
357 DeferredDeclsToEmit.clear();
359 OpenMPRuntime->clear();
362 void InstrProfStats::reportDiagnostics(DiagnosticsEngine &Diags,
363 StringRef MainFile) {
364 if (!hasDiagnostics())
366 if (VisitedInMainFile > 0 && VisitedInMainFile == MissingInMainFile) {
367 if (MainFile.empty())
368 MainFile = "<stdin>";
369 Diags.Report(diag::warn_profile_data_unprofiled) << MainFile;
371 Diags.Report(diag::warn_profile_data_out_of_date) << Visited << Missing
375 void CodeGenModule::Release() {
377 applyGlobalValReplacements();
380 EmitCXXGlobalInitFunc();
381 EmitCXXGlobalDtorFunc();
382 EmitCXXThreadLocalInitFunc();
384 if (llvm::Function *ObjCInitFunction = ObjCRuntime->ModuleInitFunction())
385 AddGlobalCtor(ObjCInitFunction);
386 if (Context.getLangOpts().CUDA && !Context.getLangOpts().CUDAIsDevice &&
388 if (llvm::Function *CudaCtorFunction = CUDARuntime->makeModuleCtorFunction())
389 AddGlobalCtor(CudaCtorFunction);
390 if (llvm::Function *CudaDtorFunction = CUDARuntime->makeModuleDtorFunction())
391 AddGlobalDtor(CudaDtorFunction);
394 if (llvm::Function *OpenMPRegistrationFunction =
395 OpenMPRuntime->emitRegistrationFunction())
396 AddGlobalCtor(OpenMPRegistrationFunction, 0);
398 getModule().setProfileSummary(PGOReader->getSummary().getMD(VMContext));
399 if (PGOStats.hasDiagnostics())
400 PGOStats.reportDiagnostics(getDiags(), getCodeGenOpts().MainFileName);
402 EmitCtorList(GlobalCtors, "llvm.global_ctors");
403 EmitCtorList(GlobalDtors, "llvm.global_dtors");
404 EmitGlobalAnnotations();
405 EmitStaticExternCAliases();
406 EmitDeferredUnusedCoverageMappings();
408 CoverageMapping->emit();
409 if (CodeGenOpts.SanitizeCfiCrossDso)
410 CodeGenFunction(*this).EmitCfiCheckFail();
415 if (CodeGenOpts.Autolink &&
416 (Context.getLangOpts().Modules || !LinkerOptionsMetadata.empty())) {
417 EmitModuleLinkOptions();
419 if (CodeGenOpts.DwarfVersion) {
420 // We actually want the latest version when there are conflicts.
421 // We can change from Warning to Latest if such mode is supported.
422 getModule().addModuleFlag(llvm::Module::Warning, "Dwarf Version",
423 CodeGenOpts.DwarfVersion);
425 if (CodeGenOpts.EmitCodeView) {
426 // Indicate that we want CodeView in the metadata.
427 getModule().addModuleFlag(llvm::Module::Warning, "CodeView", 1);
429 if (CodeGenOpts.OptimizationLevel > 0 && CodeGenOpts.StrictVTablePointers) {
430 // We don't support LTO with 2 with different StrictVTablePointers
431 // FIXME: we could support it by stripping all the information introduced
432 // by StrictVTablePointers.
434 getModule().addModuleFlag(llvm::Module::Error, "StrictVTablePointers",1);
436 llvm::Metadata *Ops[2] = {
437 llvm::MDString::get(VMContext, "StrictVTablePointers"),
438 llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
439 llvm::Type::getInt32Ty(VMContext), 1))};
441 getModule().addModuleFlag(llvm::Module::Require,
442 "StrictVTablePointersRequirement",
443 llvm::MDNode::get(VMContext, Ops));
446 // We support a single version in the linked module. The LLVM
447 // parser will drop debug info with a different version number
448 // (and warn about it, too).
449 getModule().addModuleFlag(llvm::Module::Warning, "Debug Info Version",
450 llvm::DEBUG_METADATA_VERSION);
452 // We need to record the widths of enums and wchar_t, so that we can generate
453 // the correct build attributes in the ARM backend.
454 llvm::Triple::ArchType Arch = Context.getTargetInfo().getTriple().getArch();
455 if ( Arch == llvm::Triple::arm
456 || Arch == llvm::Triple::armeb
457 || Arch == llvm::Triple::thumb
458 || Arch == llvm::Triple::thumbeb) {
459 // Width of wchar_t in bytes
460 uint64_t WCharWidth =
461 Context.getTypeSizeInChars(Context.getWideCharType()).getQuantity();
462 getModule().addModuleFlag(llvm::Module::Error, "wchar_size", WCharWidth);
464 // The minimum width of an enum in bytes
465 uint64_t EnumWidth = Context.getLangOpts().ShortEnums ? 1 : 4;
466 getModule().addModuleFlag(llvm::Module::Error, "min_enum_size", EnumWidth);
469 if (CodeGenOpts.SanitizeCfiCrossDso) {
470 // Indicate that we want cross-DSO control flow integrity checks.
471 getModule().addModuleFlag(llvm::Module::Override, "Cross-DSO CFI", 1);
474 if (LangOpts.CUDAIsDevice && getTriple().isNVPTX()) {
475 // Indicate whether __nvvm_reflect should be configured to flush denormal
476 // floating point values to 0. (This corresponds to its "__CUDA_FTZ"
478 getModule().addModuleFlag(llvm::Module::Override, "nvvm-reflect-ftz",
479 LangOpts.CUDADeviceFlushDenormalsToZero ? 1 : 0);
482 if (uint32_t PLevel = Context.getLangOpts().PICLevel) {
483 assert(PLevel < 3 && "Invalid PIC Level");
484 getModule().setPICLevel(static_cast<llvm::PICLevel::Level>(PLevel));
485 if (Context.getLangOpts().PIE)
486 getModule().setPIELevel(static_cast<llvm::PIELevel::Level>(PLevel));
489 SimplifyPersonality();
491 if (getCodeGenOpts().EmitDeclMetadata)
494 if (getCodeGenOpts().EmitGcovArcs || getCodeGenOpts().EmitGcovNotes)
498 DebugInfo->finalize();
500 EmitVersionIdentMetadata();
502 EmitTargetMetadata();
505 void CodeGenModule::UpdateCompletedType(const TagDecl *TD) {
506 // Make sure that this type is translated.
507 Types.UpdateCompletedType(TD);
510 void CodeGenModule::RefreshTypeCacheForClass(const CXXRecordDecl *RD) {
511 // Make sure that this type is translated.
512 Types.RefreshTypeCacheForClass(RD);
515 llvm::MDNode *CodeGenModule::getTBAAInfo(QualType QTy) {
518 return TBAA->getTBAAInfo(QTy);
521 llvm::MDNode *CodeGenModule::getTBAAInfoForVTablePtr() {
524 return TBAA->getTBAAInfoForVTablePtr();
527 llvm::MDNode *CodeGenModule::getTBAAStructInfo(QualType QTy) {
530 return TBAA->getTBAAStructInfo(QTy);
533 llvm::MDNode *CodeGenModule::getTBAAStructTagInfo(QualType BaseTy,
534 llvm::MDNode *AccessN,
538 return TBAA->getTBAAStructTagInfo(BaseTy, AccessN, O);
541 /// Decorate the instruction with a TBAA tag. For both scalar TBAA
542 /// and struct-path aware TBAA, the tag has the same format:
543 /// base type, access type and offset.
544 /// When ConvertTypeToTag is true, we create a tag based on the scalar type.
545 void CodeGenModule::DecorateInstructionWithTBAA(llvm::Instruction *Inst,
546 llvm::MDNode *TBAAInfo,
547 bool ConvertTypeToTag) {
548 if (ConvertTypeToTag && TBAA)
549 Inst->setMetadata(llvm::LLVMContext::MD_tbaa,
550 TBAA->getTBAAScalarTagInfo(TBAAInfo));
552 Inst->setMetadata(llvm::LLVMContext::MD_tbaa, TBAAInfo);
555 void CodeGenModule::DecorateInstructionWithInvariantGroup(
556 llvm::Instruction *I, const CXXRecordDecl *RD) {
557 llvm::Metadata *MD = CreateMetadataIdentifierForType(QualType(RD->getTypeForDecl(), 0));
558 auto *MetaDataNode = dyn_cast<llvm::MDNode>(MD);
559 // Check if we have to wrap MDString in MDNode.
561 MetaDataNode = llvm::MDNode::get(getLLVMContext(), MD);
562 I->setMetadata(llvm::LLVMContext::MD_invariant_group, MetaDataNode);
565 void CodeGenModule::Error(SourceLocation loc, StringRef message) {
566 unsigned diagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error, "%0");
567 getDiags().Report(Context.getFullLoc(loc), diagID) << message;
570 /// ErrorUnsupported - Print out an error that codegen doesn't support the
571 /// specified stmt yet.
572 void CodeGenModule::ErrorUnsupported(const Stmt *S, const char *Type) {
573 unsigned DiagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error,
574 "cannot compile this %0 yet");
575 std::string Msg = Type;
576 getDiags().Report(Context.getFullLoc(S->getLocStart()), DiagID)
577 << Msg << S->getSourceRange();
580 /// ErrorUnsupported - Print out an error that codegen doesn't support the
581 /// specified decl yet.
582 void CodeGenModule::ErrorUnsupported(const Decl *D, const char *Type) {
583 unsigned DiagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error,
584 "cannot compile this %0 yet");
585 std::string Msg = Type;
586 getDiags().Report(Context.getFullLoc(D->getLocation()), DiagID) << Msg;
589 llvm::ConstantInt *CodeGenModule::getSize(CharUnits size) {
590 return llvm::ConstantInt::get(SizeTy, size.getQuantity());
593 void CodeGenModule::setGlobalVisibility(llvm::GlobalValue *GV,
594 const NamedDecl *D) const {
595 // Internal definitions always have default visibility.
596 if (GV->hasLocalLinkage()) {
597 GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
601 // Set visibility for definitions.
602 LinkageInfo LV = D->getLinkageAndVisibility();
603 if (LV.isVisibilityExplicit() || !GV->hasAvailableExternallyLinkage())
604 GV->setVisibility(GetLLVMVisibility(LV.getVisibility()));
607 static llvm::GlobalVariable::ThreadLocalMode GetLLVMTLSModel(StringRef S) {
608 return llvm::StringSwitch<llvm::GlobalVariable::ThreadLocalMode>(S)
609 .Case("global-dynamic", llvm::GlobalVariable::GeneralDynamicTLSModel)
610 .Case("local-dynamic", llvm::GlobalVariable::LocalDynamicTLSModel)
611 .Case("initial-exec", llvm::GlobalVariable::InitialExecTLSModel)
612 .Case("local-exec", llvm::GlobalVariable::LocalExecTLSModel);
615 static llvm::GlobalVariable::ThreadLocalMode GetLLVMTLSModel(
616 CodeGenOptions::TLSModel M) {
618 case CodeGenOptions::GeneralDynamicTLSModel:
619 return llvm::GlobalVariable::GeneralDynamicTLSModel;
620 case CodeGenOptions::LocalDynamicTLSModel:
621 return llvm::GlobalVariable::LocalDynamicTLSModel;
622 case CodeGenOptions::InitialExecTLSModel:
623 return llvm::GlobalVariable::InitialExecTLSModel;
624 case CodeGenOptions::LocalExecTLSModel:
625 return llvm::GlobalVariable::LocalExecTLSModel;
627 llvm_unreachable("Invalid TLS model!");
630 void CodeGenModule::setTLSMode(llvm::GlobalValue *GV, const VarDecl &D) const {
631 assert(D.getTLSKind() && "setting TLS mode on non-TLS var!");
633 llvm::GlobalValue::ThreadLocalMode TLM;
634 TLM = GetLLVMTLSModel(CodeGenOpts.getDefaultTLSModel());
636 // Override the TLS model if it is explicitly specified.
637 if (const TLSModelAttr *Attr = D.getAttr<TLSModelAttr>()) {
638 TLM = GetLLVMTLSModel(Attr->getModel());
641 GV->setThreadLocalMode(TLM);
644 StringRef CodeGenModule::getMangledName(GlobalDecl GD) {
645 GlobalDecl CanonicalGD = GD.getCanonicalDecl();
647 // Some ABIs don't have constructor variants. Make sure that base and
648 // complete constructors get mangled the same.
649 if (const auto *CD = dyn_cast<CXXConstructorDecl>(CanonicalGD.getDecl())) {
650 if (!getTarget().getCXXABI().hasConstructorVariants()) {
651 CXXCtorType OrigCtorType = GD.getCtorType();
652 assert(OrigCtorType == Ctor_Base || OrigCtorType == Ctor_Complete);
653 if (OrigCtorType == Ctor_Base)
654 CanonicalGD = GlobalDecl(CD, Ctor_Complete);
658 StringRef &FoundStr = MangledDeclNames[CanonicalGD];
659 if (!FoundStr.empty())
662 const auto *ND = cast<NamedDecl>(GD.getDecl());
663 SmallString<256> Buffer;
665 if (getCXXABI().getMangleContext().shouldMangleDeclName(ND)) {
666 llvm::raw_svector_ostream Out(Buffer);
667 if (const auto *D = dyn_cast<CXXConstructorDecl>(ND))
668 getCXXABI().getMangleContext().mangleCXXCtor(D, GD.getCtorType(), Out);
669 else if (const auto *D = dyn_cast<CXXDestructorDecl>(ND))
670 getCXXABI().getMangleContext().mangleCXXDtor(D, GD.getDtorType(), Out);
672 getCXXABI().getMangleContext().mangleName(ND, Out);
675 IdentifierInfo *II = ND->getIdentifier();
676 assert(II && "Attempt to mangle unnamed decl.");
677 const auto *FD = dyn_cast<FunctionDecl>(ND);
680 FD->getType()->castAs<FunctionType>()->getCallConv() == CC_X86RegCall) {
681 llvm::raw_svector_ostream Out(Buffer);
682 Out << "__regcall3__" << II->getName();
689 // Keep the first result in the case of a mangling collision.
690 auto Result = Manglings.insert(std::make_pair(Str, GD));
691 return FoundStr = Result.first->first();
694 StringRef CodeGenModule::getBlockMangledName(GlobalDecl GD,
695 const BlockDecl *BD) {
696 MangleContext &MangleCtx = getCXXABI().getMangleContext();
697 const Decl *D = GD.getDecl();
699 SmallString<256> Buffer;
700 llvm::raw_svector_ostream Out(Buffer);
702 MangleCtx.mangleGlobalBlock(BD,
703 dyn_cast_or_null<VarDecl>(initializedGlobalDecl.getDecl()), Out);
704 else if (const auto *CD = dyn_cast<CXXConstructorDecl>(D))
705 MangleCtx.mangleCtorBlock(CD, GD.getCtorType(), BD, Out);
706 else if (const auto *DD = dyn_cast<CXXDestructorDecl>(D))
707 MangleCtx.mangleDtorBlock(DD, GD.getDtorType(), BD, Out);
709 MangleCtx.mangleBlock(cast<DeclContext>(D), BD, Out);
711 auto Result = Manglings.insert(std::make_pair(Out.str(), BD));
712 return Result.first->first();
715 llvm::GlobalValue *CodeGenModule::GetGlobalValue(StringRef Name) {
716 return getModule().getNamedValue(Name);
719 /// AddGlobalCtor - Add a function to the list that will be called before
721 void CodeGenModule::AddGlobalCtor(llvm::Function *Ctor, int Priority,
722 llvm::Constant *AssociatedData) {
723 // FIXME: Type coercion of void()* types.
724 GlobalCtors.push_back(Structor(Priority, Ctor, AssociatedData));
727 /// AddGlobalDtor - Add a function to the list that will be called
728 /// when the module is unloaded.
729 void CodeGenModule::AddGlobalDtor(llvm::Function *Dtor, int Priority) {
730 // FIXME: Type coercion of void()* types.
731 GlobalDtors.push_back(Structor(Priority, Dtor, nullptr));
734 void CodeGenModule::EmitCtorList(CtorList &Fns, const char *GlobalName) {
735 if (Fns.empty()) return;
737 // Ctor function type is void()*.
738 llvm::FunctionType* CtorFTy = llvm::FunctionType::get(VoidTy, false);
739 llvm::Type *CtorPFTy = llvm::PointerType::getUnqual(CtorFTy);
741 // Get the type of a ctor entry, { i32, void ()*, i8* }.
742 llvm::StructType *CtorStructTy = llvm::StructType::get(
743 Int32Ty, llvm::PointerType::getUnqual(CtorFTy), VoidPtrTy, nullptr);
745 // Construct the constructor and destructor arrays.
746 ConstantBuilder builder(*this);
747 auto ctors = builder.beginArray(CtorStructTy);
748 for (const auto &I : Fns) {
749 auto ctor = ctors.beginStruct(CtorStructTy);
750 ctor.addInt(Int32Ty, I.Priority);
751 ctor.add(llvm::ConstantExpr::getBitCast(I.Initializer, CtorPFTy));
752 if (I.AssociatedData)
753 ctor.add(llvm::ConstantExpr::getBitCast(I.AssociatedData, VoidPtrTy));
755 ctor.addNullPointer(VoidPtrTy);
756 ctors.add(ctor.finish());
760 ctors.finishAndCreateGlobal(GlobalName, getPointerAlign(),
762 llvm::GlobalValue::AppendingLinkage);
764 // The LTO linker doesn't seem to like it when we set an alignment
765 // on appending variables. Take it off as a workaround.
766 list->setAlignment(0);
771 llvm::GlobalValue::LinkageTypes
772 CodeGenModule::getFunctionLinkage(GlobalDecl GD) {
773 const auto *D = cast<FunctionDecl>(GD.getDecl());
775 GVALinkage Linkage = getContext().GetGVALinkageForFunction(D);
777 if (isa<CXXDestructorDecl>(D) &&
778 getCXXABI().useThunkForDtorVariant(cast<CXXDestructorDecl>(D),
780 // Destructor variants in the Microsoft C++ ABI are always internal or
781 // linkonce_odr thunks emitted on an as-needed basis.
782 return Linkage == GVA_Internal ? llvm::GlobalValue::InternalLinkage
783 : llvm::GlobalValue::LinkOnceODRLinkage;
786 if (isa<CXXConstructorDecl>(D) &&
787 cast<CXXConstructorDecl>(D)->isInheritingConstructor() &&
788 Context.getTargetInfo().getCXXABI().isMicrosoft()) {
789 // Our approach to inheriting constructors is fundamentally different from
790 // that used by the MS ABI, so keep our inheriting constructor thunks
791 // internal rather than trying to pick an unambiguous mangling for them.
792 return llvm::GlobalValue::InternalLinkage;
795 return getLLVMLinkageForDeclarator(D, Linkage, /*isConstantVariable=*/false);
798 void CodeGenModule::setFunctionDLLStorageClass(GlobalDecl GD, llvm::Function *F) {
799 const auto *FD = cast<FunctionDecl>(GD.getDecl());
801 if (const auto *Dtor = dyn_cast_or_null<CXXDestructorDecl>(FD)) {
802 if (getCXXABI().useThunkForDtorVariant(Dtor, GD.getDtorType())) {
803 // Don't dllexport/import destructor thunks.
804 F->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
809 if (FD->hasAttr<DLLImportAttr>())
810 F->setDLLStorageClass(llvm::GlobalVariable::DLLImportStorageClass);
811 else if (FD->hasAttr<DLLExportAttr>())
812 F->setDLLStorageClass(llvm::GlobalVariable::DLLExportStorageClass);
814 F->setDLLStorageClass(llvm::GlobalVariable::DefaultStorageClass);
817 llvm::ConstantInt *CodeGenModule::CreateCrossDsoCfiTypeId(llvm::Metadata *MD) {
818 llvm::MDString *MDS = dyn_cast<llvm::MDString>(MD);
819 if (!MDS) return nullptr;
821 return llvm::ConstantInt::get(Int64Ty, llvm::MD5Hash(MDS->getString()));
824 void CodeGenModule::setFunctionDefinitionAttributes(const FunctionDecl *D,
826 setNonAliasAttributes(D, F);
829 void CodeGenModule::SetLLVMFunctionAttributes(const Decl *D,
830 const CGFunctionInfo &Info,
832 unsigned CallingConv;
833 AttributeListType AttributeList;
834 ConstructAttributeList(F->getName(), Info, D, AttributeList, CallingConv,
836 F->setAttributes(llvm::AttributeSet::get(getLLVMContext(), AttributeList));
837 F->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv));
840 /// Determines whether the language options require us to model
841 /// unwind exceptions. We treat -fexceptions as mandating this
842 /// except under the fragile ObjC ABI with only ObjC exceptions
843 /// enabled. This means, for example, that C with -fexceptions
845 static bool hasUnwindExceptions(const LangOptions &LangOpts) {
846 // If exceptions are completely disabled, obviously this is false.
847 if (!LangOpts.Exceptions) return false;
849 // If C++ exceptions are enabled, this is true.
850 if (LangOpts.CXXExceptions) return true;
852 // If ObjC exceptions are enabled, this depends on the ABI.
853 if (LangOpts.ObjCExceptions) {
854 return LangOpts.ObjCRuntime.hasUnwindExceptions();
860 void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D,
864 if (CodeGenOpts.UnwindTables)
865 B.addAttribute(llvm::Attribute::UWTable);
867 if (!hasUnwindExceptions(LangOpts))
868 B.addAttribute(llvm::Attribute::NoUnwind);
870 if (LangOpts.getStackProtector() == LangOptions::SSPOn)
871 B.addAttribute(llvm::Attribute::StackProtect);
872 else if (LangOpts.getStackProtector() == LangOptions::SSPStrong)
873 B.addAttribute(llvm::Attribute::StackProtectStrong);
874 else if (LangOpts.getStackProtector() == LangOptions::SSPReq)
875 B.addAttribute(llvm::Attribute::StackProtectReq);
878 F->addAttributes(llvm::AttributeSet::FunctionIndex,
879 llvm::AttributeSet::get(
881 llvm::AttributeSet::FunctionIndex, B));
885 if (D->hasAttr<NakedAttr>()) {
886 // Naked implies noinline: we should not be inlining such functions.
887 B.addAttribute(llvm::Attribute::Naked);
888 B.addAttribute(llvm::Attribute::NoInline);
889 } else if (D->hasAttr<NoDuplicateAttr>()) {
890 B.addAttribute(llvm::Attribute::NoDuplicate);
891 } else if (D->hasAttr<NoInlineAttr>()) {
892 B.addAttribute(llvm::Attribute::NoInline);
893 } else if (D->hasAttr<AlwaysInlineAttr>() &&
894 !F->getAttributes().hasAttribute(llvm::AttributeSet::FunctionIndex,
895 llvm::Attribute::NoInline)) {
896 // (noinline wins over always_inline, and we can't specify both in IR)
897 B.addAttribute(llvm::Attribute::AlwaysInline);
900 if (D->hasAttr<ColdAttr>()) {
901 if (!D->hasAttr<OptimizeNoneAttr>())
902 B.addAttribute(llvm::Attribute::OptimizeForSize);
903 B.addAttribute(llvm::Attribute::Cold);
906 if (D->hasAttr<MinSizeAttr>())
907 B.addAttribute(llvm::Attribute::MinSize);
909 F->addAttributes(llvm::AttributeSet::FunctionIndex,
910 llvm::AttributeSet::get(
911 F->getContext(), llvm::AttributeSet::FunctionIndex, B));
913 if (D->hasAttr<OptimizeNoneAttr>()) {
914 // OptimizeNone implies noinline; we should not be inlining such functions.
915 F->addFnAttr(llvm::Attribute::OptimizeNone);
916 F->addFnAttr(llvm::Attribute::NoInline);
918 // OptimizeNone wins over OptimizeForSize, MinSize, AlwaysInline.
919 F->removeFnAttr(llvm::Attribute::OptimizeForSize);
920 F->removeFnAttr(llvm::Attribute::MinSize);
921 assert(!F->hasFnAttribute(llvm::Attribute::AlwaysInline) &&
922 "OptimizeNone and AlwaysInline on same function!");
924 // Attribute 'inlinehint' has no effect on 'optnone' functions.
925 // Explicitly remove it from the set of function attributes.
926 F->removeFnAttr(llvm::Attribute::InlineHint);
929 unsigned alignment = D->getMaxAlignment() / Context.getCharWidth();
931 F->setAlignment(alignment);
933 // Some C++ ABIs require 2-byte alignment for member functions, in order to
934 // reserve a bit for differentiating between virtual and non-virtual member
935 // functions. If the current target's C++ ABI requires this and this is a
936 // member function, set its alignment accordingly.
937 if (getTarget().getCXXABI().areMemberFunctionsAligned()) {
938 if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D))
942 // In the cross-dso CFI mode, we want !type attributes on definitions only.
943 if (CodeGenOpts.SanitizeCfiCrossDso)
944 if (auto *FD = dyn_cast<FunctionDecl>(D))
945 CreateFunctionTypeMetadata(FD, F);
948 void CodeGenModule::SetCommonAttributes(const Decl *D,
949 llvm::GlobalValue *GV) {
950 if (const auto *ND = dyn_cast_or_null<NamedDecl>(D))
951 setGlobalVisibility(GV, ND);
953 GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
955 if (D && D->hasAttr<UsedAttr>())
959 void CodeGenModule::setAliasAttributes(const Decl *D,
960 llvm::GlobalValue *GV) {
961 SetCommonAttributes(D, GV);
963 // Process the dllexport attribute based on whether the original definition
964 // (not necessarily the aliasee) was exported.
965 if (D->hasAttr<DLLExportAttr>())
966 GV->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
969 void CodeGenModule::setNonAliasAttributes(const Decl *D,
970 llvm::GlobalObject *GO) {
971 SetCommonAttributes(D, GO);
974 if (const SectionAttr *SA = D->getAttr<SectionAttr>())
975 GO->setSection(SA->getName());
977 getTargetCodeGenInfo().setTargetAttributes(D, GO, *this);
980 void CodeGenModule::SetInternalFunctionAttributes(const Decl *D,
982 const CGFunctionInfo &FI) {
983 SetLLVMFunctionAttributes(D, FI, F);
984 SetLLVMFunctionAttributesForDefinition(D, F);
986 F->setLinkage(llvm::Function::InternalLinkage);
988 setNonAliasAttributes(D, F);
991 static void setLinkageAndVisibilityForGV(llvm::GlobalValue *GV,
992 const NamedDecl *ND) {
993 // Set linkage and visibility in case we never see a definition.
994 LinkageInfo LV = ND->getLinkageAndVisibility();
995 if (LV.getLinkage() != ExternalLinkage) {
996 // Don't set internal linkage on declarations.
998 if (ND->hasAttr<DLLImportAttr>()) {
999 GV->setLinkage(llvm::GlobalValue::ExternalLinkage);
1000 GV->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
1001 } else if (ND->hasAttr<DLLExportAttr>()) {
1002 GV->setLinkage(llvm::GlobalValue::ExternalLinkage);
1003 GV->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
1004 } else if (ND->hasAttr<WeakAttr>() || ND->isWeakImported()) {
1005 // "extern_weak" is overloaded in LLVM; we probably should have
1006 // separate linkage types for this.
1007 GV->setLinkage(llvm::GlobalValue::ExternalWeakLinkage);
1010 // Set visibility on a declaration only if it's explicit.
1011 if (LV.isVisibilityExplicit())
1012 GV->setVisibility(CodeGenModule::GetLLVMVisibility(LV.getVisibility()));
1016 void CodeGenModule::CreateFunctionTypeMetadata(const FunctionDecl *FD,
1017 llvm::Function *F) {
1018 // Only if we are checking indirect calls.
1019 if (!LangOpts.Sanitize.has(SanitizerKind::CFIICall))
1022 // Non-static class methods are handled via vtable pointer checks elsewhere.
1023 if (isa<CXXMethodDecl>(FD) && !cast<CXXMethodDecl>(FD)->isStatic())
1026 // Additionally, if building with cross-DSO support...
1027 if (CodeGenOpts.SanitizeCfiCrossDso) {
1028 // Skip available_externally functions. They won't be codegen'ed in the
1029 // current module anyway.
1030 if (getContext().GetGVALinkageForFunction(FD) == GVA_AvailableExternally)
1034 llvm::Metadata *MD = CreateMetadataIdentifierForType(FD->getType());
1035 F->addTypeMetadata(0, MD);
1037 // Emit a hash-based bit set entry for cross-DSO calls.
1038 if (CodeGenOpts.SanitizeCfiCrossDso)
1039 if (auto CrossDsoTypeId = CreateCrossDsoCfiTypeId(MD))
1040 F->addTypeMetadata(0, llvm::ConstantAsMetadata::get(CrossDsoTypeId));
1043 void CodeGenModule::SetFunctionAttributes(GlobalDecl GD, llvm::Function *F,
1044 bool IsIncompleteFunction,
1046 if (llvm::Intrinsic::ID IID = F->getIntrinsicID()) {
1047 // If this is an intrinsic function, set the function's attributes
1048 // to the intrinsic's attributes.
1049 F->setAttributes(llvm::Intrinsic::getAttributes(getLLVMContext(), IID));
1053 const auto *FD = cast<FunctionDecl>(GD.getDecl());
1055 if (!IsIncompleteFunction)
1056 SetLLVMFunctionAttributes(FD, getTypes().arrangeGlobalDeclaration(GD), F);
1058 // Add the Returned attribute for "this", except for iOS 5 and earlier
1059 // where substantial code, including the libstdc++ dylib, was compiled with
1060 // GCC and does not actually return "this".
1061 if (!IsThunk && getCXXABI().HasThisReturn(GD) &&
1062 !(getTriple().isiOS() && getTriple().isOSVersionLT(6))) {
1063 assert(!F->arg_empty() &&
1064 F->arg_begin()->getType()
1065 ->canLosslesslyBitCastTo(F->getReturnType()) &&
1066 "unexpected this return");
1067 F->addAttribute(1, llvm::Attribute::Returned);
1070 // Only a few attributes are set on declarations; these may later be
1071 // overridden by a definition.
1073 setLinkageAndVisibilityForGV(F, FD);
1075 if (const SectionAttr *SA = FD->getAttr<SectionAttr>())
1076 F->setSection(SA->getName());
1078 if (FD->isReplaceableGlobalAllocationFunction()) {
1079 // A replaceable global allocation function does not act like a builtin by
1080 // default, only if it is invoked by a new-expression or delete-expression.
1081 F->addAttribute(llvm::AttributeSet::FunctionIndex,
1082 llvm::Attribute::NoBuiltin);
1084 // A sane operator new returns a non-aliasing pointer.
1085 // FIXME: Also add NonNull attribute to the return value
1086 // for the non-nothrow forms?
1087 auto Kind = FD->getDeclName().getCXXOverloadedOperator();
1088 if (getCodeGenOpts().AssumeSaneOperatorNew &&
1089 (Kind == OO_New || Kind == OO_Array_New))
1090 F->addAttribute(llvm::AttributeSet::ReturnIndex,
1091 llvm::Attribute::NoAlias);
1094 if (isa<CXXConstructorDecl>(FD) || isa<CXXDestructorDecl>(FD))
1095 F->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1096 else if (const auto *MD = dyn_cast<CXXMethodDecl>(FD))
1097 if (MD->isVirtual())
1098 F->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1100 // Don't emit entries for function declarations in the cross-DSO mode. This
1101 // is handled with better precision by the receiving DSO.
1102 if (!CodeGenOpts.SanitizeCfiCrossDso)
1103 CreateFunctionTypeMetadata(FD, F);
1106 void CodeGenModule::addUsedGlobal(llvm::GlobalValue *GV) {
1107 assert(!GV->isDeclaration() &&
1108 "Only globals with definition can force usage.");
1109 LLVMUsed.emplace_back(GV);
1112 void CodeGenModule::addCompilerUsedGlobal(llvm::GlobalValue *GV) {
1113 assert(!GV->isDeclaration() &&
1114 "Only globals with definition can force usage.");
1115 LLVMCompilerUsed.emplace_back(GV);
1118 static void emitUsed(CodeGenModule &CGM, StringRef Name,
1119 std::vector<llvm::WeakVH> &List) {
1120 // Don't create llvm.used if there is no need.
1124 // Convert List to what ConstantArray needs.
1125 SmallVector<llvm::Constant*, 8> UsedArray;
1126 UsedArray.resize(List.size());
1127 for (unsigned i = 0, e = List.size(); i != e; ++i) {
1129 llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(
1130 cast<llvm::Constant>(&*List[i]), CGM.Int8PtrTy);
1133 if (UsedArray.empty())
1135 llvm::ArrayType *ATy = llvm::ArrayType::get(CGM.Int8PtrTy, UsedArray.size());
1137 auto *GV = new llvm::GlobalVariable(
1138 CGM.getModule(), ATy, false, llvm::GlobalValue::AppendingLinkage,
1139 llvm::ConstantArray::get(ATy, UsedArray), Name);
1141 GV->setSection("llvm.metadata");
1144 void CodeGenModule::emitLLVMUsed() {
1145 emitUsed(*this, "llvm.used", LLVMUsed);
1146 emitUsed(*this, "llvm.compiler.used", LLVMCompilerUsed);
1149 void CodeGenModule::AppendLinkerOptions(StringRef Opts) {
1150 auto *MDOpts = llvm::MDString::get(getLLVMContext(), Opts);
1151 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
1154 void CodeGenModule::AddDetectMismatch(StringRef Name, StringRef Value) {
1155 llvm::SmallString<32> Opt;
1156 getTargetCodeGenInfo().getDetectMismatchOption(Name, Value, Opt);
1157 auto *MDOpts = llvm::MDString::get(getLLVMContext(), Opt);
1158 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
1161 void CodeGenModule::AddDependentLib(StringRef Lib) {
1162 llvm::SmallString<24> Opt;
1163 getTargetCodeGenInfo().getDependentLibraryOption(Lib, Opt);
1164 auto *MDOpts = llvm::MDString::get(getLLVMContext(), Opt);
1165 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
1168 /// \brief Add link options implied by the given module, including modules
1169 /// it depends on, using a postorder walk.
1170 static void addLinkOptionsPostorder(CodeGenModule &CGM, Module *Mod,
1171 SmallVectorImpl<llvm::Metadata *> &Metadata,
1172 llvm::SmallPtrSet<Module *, 16> &Visited) {
1173 // Import this module's parent.
1174 if (Mod->Parent && Visited.insert(Mod->Parent).second) {
1175 addLinkOptionsPostorder(CGM, Mod->Parent, Metadata, Visited);
1178 // Import this module's dependencies.
1179 for (unsigned I = Mod->Imports.size(); I > 0; --I) {
1180 if (Visited.insert(Mod->Imports[I - 1]).second)
1181 addLinkOptionsPostorder(CGM, Mod->Imports[I-1], Metadata, Visited);
1184 // Add linker options to link against the libraries/frameworks
1185 // described by this module.
1186 llvm::LLVMContext &Context = CGM.getLLVMContext();
1187 for (unsigned I = Mod->LinkLibraries.size(); I > 0; --I) {
1188 // Link against a framework. Frameworks are currently Darwin only, so we
1189 // don't to ask TargetCodeGenInfo for the spelling of the linker option.
1190 if (Mod->LinkLibraries[I-1].IsFramework) {
1191 llvm::Metadata *Args[2] = {
1192 llvm::MDString::get(Context, "-framework"),
1193 llvm::MDString::get(Context, Mod->LinkLibraries[I - 1].Library)};
1195 Metadata.push_back(llvm::MDNode::get(Context, Args));
1199 // Link against a library.
1200 llvm::SmallString<24> Opt;
1201 CGM.getTargetCodeGenInfo().getDependentLibraryOption(
1202 Mod->LinkLibraries[I-1].Library, Opt);
1203 auto *OptString = llvm::MDString::get(Context, Opt);
1204 Metadata.push_back(llvm::MDNode::get(Context, OptString));
1208 void CodeGenModule::EmitModuleLinkOptions() {
1209 // Collect the set of all of the modules we want to visit to emit link
1210 // options, which is essentially the imported modules and all of their
1211 // non-explicit child modules.
1212 llvm::SetVector<clang::Module *> LinkModules;
1213 llvm::SmallPtrSet<clang::Module *, 16> Visited;
1214 SmallVector<clang::Module *, 16> Stack;
1216 // Seed the stack with imported modules.
1217 for (Module *M : ImportedModules)
1218 if (Visited.insert(M).second)
1221 // Find all of the modules to import, making a little effort to prune
1222 // non-leaf modules.
1223 while (!Stack.empty()) {
1224 clang::Module *Mod = Stack.pop_back_val();
1226 bool AnyChildren = false;
1228 // Visit the submodules of this module.
1229 for (clang::Module::submodule_iterator Sub = Mod->submodule_begin(),
1230 SubEnd = Mod->submodule_end();
1231 Sub != SubEnd; ++Sub) {
1232 // Skip explicit children; they need to be explicitly imported to be
1234 if ((*Sub)->IsExplicit)
1237 if (Visited.insert(*Sub).second) {
1238 Stack.push_back(*Sub);
1243 // We didn't find any children, so add this module to the list of
1244 // modules to link against.
1246 LinkModules.insert(Mod);
1250 // Add link options for all of the imported modules in reverse topological
1251 // order. We don't do anything to try to order import link flags with respect
1252 // to linker options inserted by things like #pragma comment().
1253 SmallVector<llvm::Metadata *, 16> MetadataArgs;
1255 for (Module *M : LinkModules)
1256 if (Visited.insert(M).second)
1257 addLinkOptionsPostorder(*this, M, MetadataArgs, Visited);
1258 std::reverse(MetadataArgs.begin(), MetadataArgs.end());
1259 LinkerOptionsMetadata.append(MetadataArgs.begin(), MetadataArgs.end());
1261 // Add the linker options metadata flag.
1262 getModule().addModuleFlag(llvm::Module::AppendUnique, "Linker Options",
1263 llvm::MDNode::get(getLLVMContext(),
1264 LinkerOptionsMetadata));
1267 void CodeGenModule::EmitDeferred() {
1268 // Emit code for any potentially referenced deferred decls. Since a
1269 // previously unused static decl may become used during the generation of code
1270 // for a static function, iterate until no changes are made.
1272 if (!DeferredVTables.empty()) {
1273 EmitDeferredVTables();
1275 // Emitting a vtable doesn't directly cause more vtables to
1276 // become deferred, although it can cause functions to be
1277 // emitted that then need those vtables.
1278 assert(DeferredVTables.empty());
1281 // Stop if we're out of both deferred vtables and deferred declarations.
1282 if (DeferredDeclsToEmit.empty())
1285 // Grab the list of decls to emit. If EmitGlobalDefinition schedules more
1286 // work, it will not interfere with this.
1287 std::vector<DeferredGlobal> CurDeclsToEmit;
1288 CurDeclsToEmit.swap(DeferredDeclsToEmit);
1290 for (DeferredGlobal &G : CurDeclsToEmit) {
1291 GlobalDecl D = G.GD;
1294 // We should call GetAddrOfGlobal with IsForDefinition set to true in order
1295 // to get GlobalValue with exactly the type we need, not something that
1296 // might had been created for another decl with the same mangled name but
1298 llvm::GlobalValue *GV = dyn_cast<llvm::GlobalValue>(
1299 GetAddrOfGlobal(D, /*IsForDefinition=*/true));
1301 // In case of different address spaces, we may still get a cast, even with
1302 // IsForDefinition equal to true. Query mangled names table to get
1305 GV = GetGlobalValue(getMangledName(D));
1307 // Make sure GetGlobalValue returned non-null.
1310 // Check to see if we've already emitted this. This is necessary
1311 // for a couple of reasons: first, decls can end up in the
1312 // deferred-decls queue multiple times, and second, decls can end
1313 // up with definitions in unusual ways (e.g. by an extern inline
1314 // function acquiring a strong function redefinition). Just
1315 // ignore these cases.
1316 if (!GV->isDeclaration())
1319 // Otherwise, emit the definition and move on to the next one.
1320 EmitGlobalDefinition(D, GV);
1322 // If we found out that we need to emit more decls, do that recursively.
1323 // This has the advantage that the decls are emitted in a DFS and related
1324 // ones are close together, which is convenient for testing.
1325 if (!DeferredVTables.empty() || !DeferredDeclsToEmit.empty()) {
1327 assert(DeferredVTables.empty() && DeferredDeclsToEmit.empty());
1332 void CodeGenModule::EmitGlobalAnnotations() {
1333 if (Annotations.empty())
1336 // Create a new global variable for the ConstantStruct in the Module.
1337 llvm::Constant *Array = llvm::ConstantArray::get(llvm::ArrayType::get(
1338 Annotations[0]->getType(), Annotations.size()), Annotations);
1339 auto *gv = new llvm::GlobalVariable(getModule(), Array->getType(), false,
1340 llvm::GlobalValue::AppendingLinkage,
1341 Array, "llvm.global.annotations");
1342 gv->setSection(AnnotationSection);
1345 llvm::Constant *CodeGenModule::EmitAnnotationString(StringRef Str) {
1346 llvm::Constant *&AStr = AnnotationStrings[Str];
1350 // Not found yet, create a new global.
1351 llvm::Constant *s = llvm::ConstantDataArray::getString(getLLVMContext(), Str);
1353 new llvm::GlobalVariable(getModule(), s->getType(), true,
1354 llvm::GlobalValue::PrivateLinkage, s, ".str");
1355 gv->setSection(AnnotationSection);
1356 gv->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1361 llvm::Constant *CodeGenModule::EmitAnnotationUnit(SourceLocation Loc) {
1362 SourceManager &SM = getContext().getSourceManager();
1363 PresumedLoc PLoc = SM.getPresumedLoc(Loc);
1365 return EmitAnnotationString(PLoc.getFilename());
1366 return EmitAnnotationString(SM.getBufferName(Loc));
1369 llvm::Constant *CodeGenModule::EmitAnnotationLineNo(SourceLocation L) {
1370 SourceManager &SM = getContext().getSourceManager();
1371 PresumedLoc PLoc = SM.getPresumedLoc(L);
1372 unsigned LineNo = PLoc.isValid() ? PLoc.getLine() :
1373 SM.getExpansionLineNumber(L);
1374 return llvm::ConstantInt::get(Int32Ty, LineNo);
1377 llvm::Constant *CodeGenModule::EmitAnnotateAttr(llvm::GlobalValue *GV,
1378 const AnnotateAttr *AA,
1380 // Get the globals for file name, annotation, and the line number.
1381 llvm::Constant *AnnoGV = EmitAnnotationString(AA->getAnnotation()),
1382 *UnitGV = EmitAnnotationUnit(L),
1383 *LineNoCst = EmitAnnotationLineNo(L);
1385 // Create the ConstantStruct for the global annotation.
1386 llvm::Constant *Fields[4] = {
1387 llvm::ConstantExpr::getBitCast(GV, Int8PtrTy),
1388 llvm::ConstantExpr::getBitCast(AnnoGV, Int8PtrTy),
1389 llvm::ConstantExpr::getBitCast(UnitGV, Int8PtrTy),
1392 return llvm::ConstantStruct::getAnon(Fields);
1395 void CodeGenModule::AddGlobalAnnotations(const ValueDecl *D,
1396 llvm::GlobalValue *GV) {
1397 assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute");
1398 // Get the struct elements for these annotations.
1399 for (const auto *I : D->specific_attrs<AnnotateAttr>())
1400 Annotations.push_back(EmitAnnotateAttr(GV, I, D->getLocation()));
1403 bool CodeGenModule::isInSanitizerBlacklist(llvm::Function *Fn,
1404 SourceLocation Loc) const {
1405 const auto &SanitizerBL = getContext().getSanitizerBlacklist();
1406 // Blacklist by function name.
1407 if (SanitizerBL.isBlacklistedFunction(Fn->getName()))
1409 // Blacklist by location.
1411 return SanitizerBL.isBlacklistedLocation(Loc);
1412 // If location is unknown, this may be a compiler-generated function. Assume
1413 // it's located in the main file.
1414 auto &SM = Context.getSourceManager();
1415 if (const auto *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
1416 return SanitizerBL.isBlacklistedFile(MainFile->getName());
1421 bool CodeGenModule::isInSanitizerBlacklist(llvm::GlobalVariable *GV,
1422 SourceLocation Loc, QualType Ty,
1423 StringRef Category) const {
1424 // For now globals can be blacklisted only in ASan and KASan.
1425 if (!LangOpts.Sanitize.hasOneOf(
1426 SanitizerKind::Address | SanitizerKind::KernelAddress))
1428 const auto &SanitizerBL = getContext().getSanitizerBlacklist();
1429 if (SanitizerBL.isBlacklistedGlobal(GV->getName(), Category))
1431 if (SanitizerBL.isBlacklistedLocation(Loc, Category))
1433 // Check global type.
1435 // Drill down the array types: if global variable of a fixed type is
1436 // blacklisted, we also don't instrument arrays of them.
1437 while (auto AT = dyn_cast<ArrayType>(Ty.getTypePtr()))
1438 Ty = AT->getElementType();
1439 Ty = Ty.getCanonicalType().getUnqualifiedType();
1440 // We allow to blacklist only record types (classes, structs etc.)
1441 if (Ty->isRecordType()) {
1442 std::string TypeStr = Ty.getAsString(getContext().getPrintingPolicy());
1443 if (SanitizerBL.isBlacklistedType(TypeStr, Category))
1450 bool CodeGenModule::MustBeEmitted(const ValueDecl *Global) {
1451 // Never defer when EmitAllDecls is specified.
1452 if (LangOpts.EmitAllDecls)
1455 return getContext().DeclMustBeEmitted(Global);
1458 bool CodeGenModule::MayBeEmittedEagerly(const ValueDecl *Global) {
1459 if (const auto *FD = dyn_cast<FunctionDecl>(Global))
1460 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
1461 // Implicit template instantiations may change linkage if they are later
1462 // explicitly instantiated, so they should not be emitted eagerly.
1464 if (const auto *VD = dyn_cast<VarDecl>(Global))
1465 if (Context.getInlineVariableDefinitionKind(VD) ==
1466 ASTContext::InlineVariableDefinitionKind::WeakUnknown)
1467 // A definition of an inline constexpr static data member may change
1468 // linkage later if it's redeclared outside the class.
1470 // If OpenMP is enabled and threadprivates must be generated like TLS, delay
1471 // codegen for global variables, because they may be marked as threadprivate.
1472 if (LangOpts.OpenMP && LangOpts.OpenMPUseTLS &&
1473 getContext().getTargetInfo().isTLSSupported() && isa<VarDecl>(Global))
1479 ConstantAddress CodeGenModule::GetAddrOfUuidDescriptor(
1480 const CXXUuidofExpr* E) {
1481 // Sema has verified that IIDSource has a __declspec(uuid()), and that its
1483 StringRef Uuid = E->getUuidStr();
1484 std::string Name = "_GUID_" + Uuid.lower();
1485 std::replace(Name.begin(), Name.end(), '-', '_');
1487 // The UUID descriptor should be pointer aligned.
1488 CharUnits Alignment = CharUnits::fromQuantity(PointerAlignInBytes);
1490 // Look for an existing global.
1491 if (llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name))
1492 return ConstantAddress(GV, Alignment);
1494 llvm::Constant *Init = EmitUuidofInitializer(Uuid);
1495 assert(Init && "failed to initialize as constant");
1497 auto *GV = new llvm::GlobalVariable(
1498 getModule(), Init->getType(),
1499 /*isConstant=*/true, llvm::GlobalValue::LinkOnceODRLinkage, Init, Name);
1500 if (supportsCOMDAT())
1501 GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
1502 return ConstantAddress(GV, Alignment);
1505 ConstantAddress CodeGenModule::GetWeakRefReference(const ValueDecl *VD) {
1506 const AliasAttr *AA = VD->getAttr<AliasAttr>();
1507 assert(AA && "No alias?");
1509 CharUnits Alignment = getContext().getDeclAlign(VD);
1510 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(VD->getType());
1512 // See if there is already something with the target's name in the module.
1513 llvm::GlobalValue *Entry = GetGlobalValue(AA->getAliasee());
1515 unsigned AS = getContext().getTargetAddressSpace(VD->getType());
1516 auto Ptr = llvm::ConstantExpr::getBitCast(Entry, DeclTy->getPointerTo(AS));
1517 return ConstantAddress(Ptr, Alignment);
1520 llvm::Constant *Aliasee;
1521 if (isa<llvm::FunctionType>(DeclTy))
1522 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy,
1523 GlobalDecl(cast<FunctionDecl>(VD)),
1524 /*ForVTable=*/false);
1526 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
1527 llvm::PointerType::getUnqual(DeclTy),
1530 auto *F = cast<llvm::GlobalValue>(Aliasee);
1531 F->setLinkage(llvm::Function::ExternalWeakLinkage);
1532 WeakRefReferences.insert(F);
1534 return ConstantAddress(Aliasee, Alignment);
1537 void CodeGenModule::EmitGlobal(GlobalDecl GD) {
1538 const auto *Global = cast<ValueDecl>(GD.getDecl());
1540 // Weak references don't produce any output by themselves.
1541 if (Global->hasAttr<WeakRefAttr>())
1544 // If this is an alias definition (which otherwise looks like a declaration)
1546 if (Global->hasAttr<AliasAttr>())
1547 return EmitAliasDefinition(GD);
1549 // IFunc like an alias whose value is resolved at runtime by calling resolver.
1550 if (Global->hasAttr<IFuncAttr>())
1551 return emitIFuncDefinition(GD);
1553 // If this is CUDA, be selective about which declarations we emit.
1554 if (LangOpts.CUDA) {
1555 if (LangOpts.CUDAIsDevice) {
1556 if (!Global->hasAttr<CUDADeviceAttr>() &&
1557 !Global->hasAttr<CUDAGlobalAttr>() &&
1558 !Global->hasAttr<CUDAConstantAttr>() &&
1559 !Global->hasAttr<CUDASharedAttr>())
1562 // We need to emit host-side 'shadows' for all global
1563 // device-side variables because the CUDA runtime needs their
1564 // size and host-side address in order to provide access to
1565 // their device-side incarnations.
1567 // So device-only functions are the only things we skip.
1568 if (isa<FunctionDecl>(Global) && !Global->hasAttr<CUDAHostAttr>() &&
1569 Global->hasAttr<CUDADeviceAttr>())
1572 assert((isa<FunctionDecl>(Global) || isa<VarDecl>(Global)) &&
1573 "Expected Variable or Function");
1577 if (LangOpts.OpenMP) {
1578 // If this is OpenMP device, check if it is legal to emit this global
1580 if (OpenMPRuntime && OpenMPRuntime->emitTargetGlobal(GD))
1582 if (auto *DRD = dyn_cast<OMPDeclareReductionDecl>(Global)) {
1583 if (MustBeEmitted(Global))
1584 EmitOMPDeclareReduction(DRD);
1589 // Ignore declarations, they will be emitted on their first use.
1590 if (const auto *FD = dyn_cast<FunctionDecl>(Global)) {
1591 // Forward declarations are emitted lazily on first use.
1592 if (!FD->doesThisDeclarationHaveABody()) {
1593 if (!FD->doesDeclarationForceExternallyVisibleDefinition())
1596 StringRef MangledName = getMangledName(GD);
1598 // Compute the function info and LLVM type.
1599 const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
1600 llvm::Type *Ty = getTypes().GetFunctionType(FI);
1602 GetOrCreateLLVMFunction(MangledName, Ty, GD, /*ForVTable=*/false,
1603 /*DontDefer=*/false);
1607 const auto *VD = cast<VarDecl>(Global);
1608 assert(VD->isFileVarDecl() && "Cannot emit local var decl as global.");
1609 // We need to emit device-side global CUDA variables even if a
1610 // variable does not have a definition -- we still need to define
1611 // host-side shadow for it.
1612 bool MustEmitForCuda = LangOpts.CUDA && !LangOpts.CUDAIsDevice &&
1613 !VD->hasDefinition() &&
1614 (VD->hasAttr<CUDAConstantAttr>() ||
1615 VD->hasAttr<CUDADeviceAttr>());
1616 if (!MustEmitForCuda &&
1617 VD->isThisDeclarationADefinition() != VarDecl::Definition &&
1618 !Context.isMSStaticDataMemberInlineDefinition(VD)) {
1619 // If this declaration may have caused an inline variable definition to
1620 // change linkage, make sure that it's emitted.
1621 if (Context.getInlineVariableDefinitionKind(VD) ==
1622 ASTContext::InlineVariableDefinitionKind::Strong)
1623 GetAddrOfGlobalVar(VD);
1628 // Defer code generation to first use when possible, e.g. if this is an inline
1629 // function. If the global must always be emitted, do it eagerly if possible
1630 // to benefit from cache locality.
1631 if (MustBeEmitted(Global) && MayBeEmittedEagerly(Global)) {
1632 // Emit the definition if it can't be deferred.
1633 EmitGlobalDefinition(GD);
1637 // If we're deferring emission of a C++ variable with an
1638 // initializer, remember the order in which it appeared in the file.
1639 if (getLangOpts().CPlusPlus && isa<VarDecl>(Global) &&
1640 cast<VarDecl>(Global)->hasInit()) {
1641 DelayedCXXInitPosition[Global] = CXXGlobalInits.size();
1642 CXXGlobalInits.push_back(nullptr);
1645 StringRef MangledName = getMangledName(GD);
1646 if (llvm::GlobalValue *GV = GetGlobalValue(MangledName)) {
1647 // The value has already been used and should therefore be emitted.
1648 addDeferredDeclToEmit(GV, GD);
1649 } else if (MustBeEmitted(Global)) {
1650 // The value must be emitted, but cannot be emitted eagerly.
1651 assert(!MayBeEmittedEagerly(Global));
1652 addDeferredDeclToEmit(/*GV=*/nullptr, GD);
1654 // Otherwise, remember that we saw a deferred decl with this name. The
1655 // first use of the mangled name will cause it to move into
1656 // DeferredDeclsToEmit.
1657 DeferredDecls[MangledName] = GD;
1662 struct FunctionIsDirectlyRecursive :
1663 public RecursiveASTVisitor<FunctionIsDirectlyRecursive> {
1664 const StringRef Name;
1665 const Builtin::Context &BI;
1667 FunctionIsDirectlyRecursive(StringRef N, const Builtin::Context &C) :
1668 Name(N), BI(C), Result(false) {
1670 typedef RecursiveASTVisitor<FunctionIsDirectlyRecursive> Base;
1672 bool TraverseCallExpr(CallExpr *E) {
1673 const FunctionDecl *FD = E->getDirectCallee();
1676 AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
1677 if (Attr && Name == Attr->getLabel()) {
1681 unsigned BuiltinID = FD->getBuiltinID();
1682 if (!BuiltinID || !BI.isLibFunction(BuiltinID))
1684 StringRef BuiltinName = BI.getName(BuiltinID);
1685 if (BuiltinName.startswith("__builtin_") &&
1686 Name == BuiltinName.slice(strlen("__builtin_"), StringRef::npos)) {
1694 struct DLLImportFunctionVisitor
1695 : public RecursiveASTVisitor<DLLImportFunctionVisitor> {
1696 bool SafeToInline = true;
1698 bool shouldVisitImplicitCode() const { return true; }
1700 bool VisitVarDecl(VarDecl *VD) {
1701 // A thread-local variable cannot be imported.
1702 SafeToInline = !VD->getTLSKind();
1703 return SafeToInline;
1706 // Make sure we're not referencing non-imported vars or functions.
1707 bool VisitDeclRefExpr(DeclRefExpr *E) {
1708 ValueDecl *VD = E->getDecl();
1709 if (isa<FunctionDecl>(VD))
1710 SafeToInline = VD->hasAttr<DLLImportAttr>();
1711 else if (VarDecl *V = dyn_cast<VarDecl>(VD))
1712 SafeToInline = !V->hasGlobalStorage() || V->hasAttr<DLLImportAttr>();
1713 return SafeToInline;
1715 bool VisitCXXConstructExpr(CXXConstructExpr *E) {
1716 SafeToInline = E->getConstructor()->hasAttr<DLLImportAttr>();
1717 return SafeToInline;
1719 bool VisitCXXDeleteExpr(CXXDeleteExpr *E) {
1720 SafeToInline = E->getOperatorDelete()->hasAttr<DLLImportAttr>();
1721 return SafeToInline;
1723 bool VisitCXXNewExpr(CXXNewExpr *E) {
1724 SafeToInline = E->getOperatorNew()->hasAttr<DLLImportAttr>();
1725 return SafeToInline;
1730 // isTriviallyRecursive - Check if this function calls another
1731 // decl that, because of the asm attribute or the other decl being a builtin,
1732 // ends up pointing to itself.
1734 CodeGenModule::isTriviallyRecursive(const FunctionDecl *FD) {
1736 if (getCXXABI().getMangleContext().shouldMangleDeclName(FD)) {
1737 // asm labels are a special kind of mangling we have to support.
1738 AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
1741 Name = Attr->getLabel();
1743 Name = FD->getName();
1746 FunctionIsDirectlyRecursive Walker(Name, Context.BuiltinInfo);
1747 Walker.TraverseFunctionDecl(const_cast<FunctionDecl*>(FD));
1748 return Walker.Result;
1751 // Check if T is a class type with a destructor that's not dllimport.
1752 static bool HasNonDllImportDtor(QualType T) {
1753 if (const RecordType *RT = dyn_cast<RecordType>(T))
1754 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()))
1755 if (RD->getDestructor() && !RD->getDestructor()->hasAttr<DLLImportAttr>())
1761 bool CodeGenModule::shouldEmitFunction(GlobalDecl GD) {
1762 if (getFunctionLinkage(GD) != llvm::Function::AvailableExternallyLinkage)
1764 const auto *F = cast<FunctionDecl>(GD.getDecl());
1765 if (CodeGenOpts.OptimizationLevel == 0 && !F->hasAttr<AlwaysInlineAttr>())
1768 if (F->hasAttr<DLLImportAttr>()) {
1769 // Check whether it would be safe to inline this dllimport function.
1770 DLLImportFunctionVisitor Visitor;
1771 Visitor.TraverseFunctionDecl(const_cast<FunctionDecl*>(F));
1772 if (!Visitor.SafeToInline)
1775 if (const CXXDestructorDecl *Dtor = dyn_cast<CXXDestructorDecl>(F)) {
1776 // Implicit destructor invocations aren't captured in the AST, so the
1777 // check above can't see them. Check for them manually here.
1778 for (const Decl *Member : Dtor->getParent()->decls())
1779 if (isa<FieldDecl>(Member))
1780 if (HasNonDllImportDtor(cast<FieldDecl>(Member)->getType()))
1782 for (const CXXBaseSpecifier &B : Dtor->getParent()->bases())
1783 if (HasNonDllImportDtor(B.getType()))
1788 // PR9614. Avoid cases where the source code is lying to us. An available
1789 // externally function should have an equivalent function somewhere else,
1790 // but a function that calls itself is clearly not equivalent to the real
1792 // This happens in glibc's btowc and in some configure checks.
1793 return !isTriviallyRecursive(F);
1796 /// If the type for the method's class was generated by
1797 /// CGDebugInfo::createContextChain(), the cache contains only a
1798 /// limited DIType without any declarations. Since EmitFunctionStart()
1799 /// needs to find the canonical declaration for each method, we need
1800 /// to construct the complete type prior to emitting the method.
1801 void CodeGenModule::CompleteDIClassType(const CXXMethodDecl* D) {
1802 if (!D->isInstance())
1805 if (CGDebugInfo *DI = getModuleDebugInfo())
1806 if (getCodeGenOpts().getDebugInfo() >= codegenoptions::LimitedDebugInfo) {
1807 const auto *ThisPtr = cast<PointerType>(D->getThisType(getContext()));
1808 DI->getOrCreateRecordType(ThisPtr->getPointeeType(), D->getLocation());
1812 void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD, llvm::GlobalValue *GV) {
1813 const auto *D = cast<ValueDecl>(GD.getDecl());
1815 PrettyStackTraceDecl CrashInfo(const_cast<ValueDecl *>(D), D->getLocation(),
1816 Context.getSourceManager(),
1817 "Generating code for declaration");
1819 if (isa<FunctionDecl>(D)) {
1820 // At -O0, don't generate IR for functions with available_externally
1822 if (!shouldEmitFunction(GD))
1825 if (const auto *Method = dyn_cast<CXXMethodDecl>(D)) {
1826 CompleteDIClassType(Method);
1827 // Make sure to emit the definition(s) before we emit the thunks.
1828 // This is necessary for the generation of certain thunks.
1829 if (const auto *CD = dyn_cast<CXXConstructorDecl>(Method))
1830 ABI->emitCXXStructor(CD, getFromCtorType(GD.getCtorType()));
1831 else if (const auto *DD = dyn_cast<CXXDestructorDecl>(Method))
1832 ABI->emitCXXStructor(DD, getFromDtorType(GD.getDtorType()));
1834 EmitGlobalFunctionDefinition(GD, GV);
1836 if (Method->isVirtual())
1837 getVTables().EmitThunks(GD);
1842 return EmitGlobalFunctionDefinition(GD, GV);
1845 if (const auto *VD = dyn_cast<VarDecl>(D))
1846 return EmitGlobalVarDefinition(VD, !VD->hasDefinition());
1848 llvm_unreachable("Invalid argument to EmitGlobalDefinition()");
1851 static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old,
1852 llvm::Function *NewFn);
1854 /// GetOrCreateLLVMFunction - If the specified mangled name is not in the
1855 /// module, create and return an llvm Function with the specified type. If there
1856 /// is something in the module with the specified name, return it potentially
1857 /// bitcasted to the right type.
1859 /// If D is non-null, it specifies a decl that correspond to this. This is used
1860 /// to set the attributes on the function when it is first created.
1862 CodeGenModule::GetOrCreateLLVMFunction(StringRef MangledName,
1864 GlobalDecl GD, bool ForVTable,
1865 bool DontDefer, bool IsThunk,
1866 llvm::AttributeSet ExtraAttrs,
1867 bool IsForDefinition) {
1868 const Decl *D = GD.getDecl();
1870 // Lookup the entry, lazily creating it if necessary.
1871 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
1873 if (WeakRefReferences.erase(Entry)) {
1874 const FunctionDecl *FD = cast_or_null<FunctionDecl>(D);
1875 if (FD && !FD->hasAttr<WeakAttr>())
1876 Entry->setLinkage(llvm::Function::ExternalLinkage);
1879 // Handle dropped DLL attributes.
1880 if (D && !D->hasAttr<DLLImportAttr>() && !D->hasAttr<DLLExportAttr>())
1881 Entry->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
1883 // If there are two attempts to define the same mangled name, issue an
1885 if (IsForDefinition && !Entry->isDeclaration()) {
1887 // Check that GD is not yet in DiagnosedConflictingDefinitions is required
1888 // to make sure that we issue an error only once.
1889 if (lookupRepresentativeDecl(MangledName, OtherGD) &&
1890 (GD.getCanonicalDecl().getDecl() !=
1891 OtherGD.getCanonicalDecl().getDecl()) &&
1892 DiagnosedConflictingDefinitions.insert(GD).second) {
1893 getDiags().Report(D->getLocation(),
1894 diag::err_duplicate_mangled_name);
1895 getDiags().Report(OtherGD.getDecl()->getLocation(),
1896 diag::note_previous_definition);
1900 if ((isa<llvm::Function>(Entry) || isa<llvm::GlobalAlias>(Entry)) &&
1901 (Entry->getType()->getElementType() == Ty)) {
1905 // Make sure the result is of the correct type.
1906 // (If function is requested for a definition, we always need to create a new
1907 // function, not just return a bitcast.)
1908 if (!IsForDefinition)
1909 return llvm::ConstantExpr::getBitCast(Entry, Ty->getPointerTo());
1912 // This function doesn't have a complete type (for example, the return
1913 // type is an incomplete struct). Use a fake type instead, and make
1914 // sure not to try to set attributes.
1915 bool IsIncompleteFunction = false;
1917 llvm::FunctionType *FTy;
1918 if (isa<llvm::FunctionType>(Ty)) {
1919 FTy = cast<llvm::FunctionType>(Ty);
1921 FTy = llvm::FunctionType::get(VoidTy, false);
1922 IsIncompleteFunction = true;
1926 llvm::Function::Create(FTy, llvm::Function::ExternalLinkage,
1927 Entry ? StringRef() : MangledName, &getModule());
1929 // If we already created a function with the same mangled name (but different
1930 // type) before, take its name and add it to the list of functions to be
1931 // replaced with F at the end of CodeGen.
1933 // This happens if there is a prototype for a function (e.g. "int f()") and
1934 // then a definition of a different type (e.g. "int f(int x)").
1938 // This might be an implementation of a function without a prototype, in
1939 // which case, try to do special replacement of calls which match the new
1940 // prototype. The really key thing here is that we also potentially drop
1941 // arguments from the call site so as to make a direct call, which makes the
1942 // inliner happier and suppresses a number of optimizer warnings (!) about
1943 // dropping arguments.
1944 if (!Entry->use_empty()) {
1945 ReplaceUsesOfNonProtoTypeWithRealFunction(Entry, F);
1946 Entry->removeDeadConstantUsers();
1949 llvm::Constant *BC = llvm::ConstantExpr::getBitCast(
1950 F, Entry->getType()->getElementType()->getPointerTo());
1951 addGlobalValReplacement(Entry, BC);
1954 assert(F->getName() == MangledName && "name was uniqued!");
1956 SetFunctionAttributes(GD, F, IsIncompleteFunction, IsThunk);
1957 if (ExtraAttrs.hasAttributes(llvm::AttributeSet::FunctionIndex)) {
1958 llvm::AttrBuilder B(ExtraAttrs, llvm::AttributeSet::FunctionIndex);
1959 F->addAttributes(llvm::AttributeSet::FunctionIndex,
1960 llvm::AttributeSet::get(VMContext,
1961 llvm::AttributeSet::FunctionIndex,
1966 // All MSVC dtors other than the base dtor are linkonce_odr and delegate to
1967 // each other bottoming out with the base dtor. Therefore we emit non-base
1968 // dtors on usage, even if there is no dtor definition in the TU.
1969 if (D && isa<CXXDestructorDecl>(D) &&
1970 getCXXABI().useThunkForDtorVariant(cast<CXXDestructorDecl>(D),
1972 addDeferredDeclToEmit(F, GD);
1974 // This is the first use or definition of a mangled name. If there is a
1975 // deferred decl with this name, remember that we need to emit it at the end
1977 auto DDI = DeferredDecls.find(MangledName);
1978 if (DDI != DeferredDecls.end()) {
1979 // Move the potentially referenced deferred decl to the
1980 // DeferredDeclsToEmit list, and remove it from DeferredDecls (since we
1981 // don't need it anymore).
1982 addDeferredDeclToEmit(F, DDI->second);
1983 DeferredDecls.erase(DDI);
1985 // Otherwise, there are cases we have to worry about where we're
1986 // using a declaration for which we must emit a definition but where
1987 // we might not find a top-level definition:
1988 // - member functions defined inline in their classes
1989 // - friend functions defined inline in some class
1990 // - special member functions with implicit definitions
1991 // If we ever change our AST traversal to walk into class methods,
1992 // this will be unnecessary.
1994 // We also don't emit a definition for a function if it's going to be an
1995 // entry in a vtable, unless it's already marked as used.
1996 } else if (getLangOpts().CPlusPlus && D) {
1997 // Look for a declaration that's lexically in a record.
1998 for (const auto *FD = cast<FunctionDecl>(D)->getMostRecentDecl(); FD;
1999 FD = FD->getPreviousDecl()) {
2000 if (isa<CXXRecordDecl>(FD->getLexicalDeclContext())) {
2001 if (FD->doesThisDeclarationHaveABody()) {
2002 addDeferredDeclToEmit(F, GD.getWithDecl(FD));
2010 // Make sure the result is of the requested type.
2011 if (!IsIncompleteFunction) {
2012 assert(F->getType()->getElementType() == Ty);
2016 llvm::Type *PTy = llvm::PointerType::getUnqual(Ty);
2017 return llvm::ConstantExpr::getBitCast(F, PTy);
2020 /// GetAddrOfFunction - Return the address of the given function. If Ty is
2021 /// non-null, then this function will use the specified type if it has to
2022 /// create it (this occurs when we see a definition of the function).
2023 llvm::Constant *CodeGenModule::GetAddrOfFunction(GlobalDecl GD,
2027 bool IsForDefinition) {
2028 // If there was no specific requested type, just convert it now.
2030 const auto *FD = cast<FunctionDecl>(GD.getDecl());
2031 auto CanonTy = Context.getCanonicalType(FD->getType());
2032 Ty = getTypes().ConvertFunctionType(CanonTy, FD);
2035 StringRef MangledName = getMangledName(GD);
2036 return GetOrCreateLLVMFunction(MangledName, Ty, GD, ForVTable, DontDefer,
2037 /*IsThunk=*/false, llvm::AttributeSet(),
2041 /// CreateRuntimeFunction - Create a new runtime function with the specified
2044 CodeGenModule::CreateRuntimeFunction(llvm::FunctionType *FTy,
2046 llvm::AttributeSet ExtraAttrs) {
2048 GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(), /*ForVTable=*/false,
2049 /*DontDefer=*/false, /*IsThunk=*/false, ExtraAttrs);
2050 if (auto *F = dyn_cast<llvm::Function>(C))
2052 F->setCallingConv(getRuntimeCC());
2056 /// CreateBuiltinFunction - Create a new builtin function with the specified
2059 CodeGenModule::CreateBuiltinFunction(llvm::FunctionType *FTy,
2061 llvm::AttributeSet ExtraAttrs) {
2063 GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(), /*ForVTable=*/false,
2064 /*DontDefer=*/false, /*IsThunk=*/false, ExtraAttrs);
2065 if (auto *F = dyn_cast<llvm::Function>(C))
2067 F->setCallingConv(getBuiltinCC());
2071 /// isTypeConstant - Determine whether an object of this type can be emitted
2074 /// If ExcludeCtor is true, the duration when the object's constructor runs
2075 /// will not be considered. The caller will need to verify that the object is
2076 /// not written to during its construction.
2077 bool CodeGenModule::isTypeConstant(QualType Ty, bool ExcludeCtor) {
2078 if (!Ty.isConstant(Context) && !Ty->isReferenceType())
2081 if (Context.getLangOpts().CPlusPlus) {
2082 if (const CXXRecordDecl *Record
2083 = Context.getBaseElementType(Ty)->getAsCXXRecordDecl())
2084 return ExcludeCtor && !Record->hasMutableFields() &&
2085 Record->hasTrivialDestructor();
2091 /// GetOrCreateLLVMGlobal - If the specified mangled name is not in the module,
2092 /// create and return an llvm GlobalVariable with the specified type. If there
2093 /// is something in the module with the specified name, return it potentially
2094 /// bitcasted to the right type.
2096 /// If D is non-null, it specifies a decl that correspond to this. This is used
2097 /// to set the attributes on the global when it is first created.
2099 /// If IsForDefinition is true, it is guranteed that an actual global with
2100 /// type Ty will be returned, not conversion of a variable with the same
2101 /// mangled name but some other type.
2103 CodeGenModule::GetOrCreateLLVMGlobal(StringRef MangledName,
2104 llvm::PointerType *Ty,
2106 bool IsForDefinition) {
2107 // Lookup the entry, lazily creating it if necessary.
2108 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
2110 if (WeakRefReferences.erase(Entry)) {
2111 if (D && !D->hasAttr<WeakAttr>())
2112 Entry->setLinkage(llvm::Function::ExternalLinkage);
2115 // Handle dropped DLL attributes.
2116 if (D && !D->hasAttr<DLLImportAttr>() && !D->hasAttr<DLLExportAttr>())
2117 Entry->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
2119 if (Entry->getType() == Ty)
2122 // If there are two attempts to define the same mangled name, issue an
2124 if (IsForDefinition && !Entry->isDeclaration()) {
2126 const VarDecl *OtherD;
2128 // Check that D is not yet in DiagnosedConflictingDefinitions is required
2129 // to make sure that we issue an error only once.
2130 if (D && lookupRepresentativeDecl(MangledName, OtherGD) &&
2131 (D->getCanonicalDecl() != OtherGD.getCanonicalDecl().getDecl()) &&
2132 (OtherD = dyn_cast<VarDecl>(OtherGD.getDecl())) &&
2133 OtherD->hasInit() &&
2134 DiagnosedConflictingDefinitions.insert(D).second) {
2135 getDiags().Report(D->getLocation(),
2136 diag::err_duplicate_mangled_name);
2137 getDiags().Report(OtherGD.getDecl()->getLocation(),
2138 diag::note_previous_definition);
2142 // Make sure the result is of the correct type.
2143 if (Entry->getType()->getAddressSpace() != Ty->getAddressSpace())
2144 return llvm::ConstantExpr::getAddrSpaceCast(Entry, Ty);
2146 // (If global is requested for a definition, we always need to create a new
2147 // global, not just return a bitcast.)
2148 if (!IsForDefinition)
2149 return llvm::ConstantExpr::getBitCast(Entry, Ty);
2152 unsigned AddrSpace = GetGlobalVarAddressSpace(D, Ty->getAddressSpace());
2153 auto *GV = new llvm::GlobalVariable(
2154 getModule(), Ty->getElementType(), false,
2155 llvm::GlobalValue::ExternalLinkage, nullptr, MangledName, nullptr,
2156 llvm::GlobalVariable::NotThreadLocal, AddrSpace);
2158 // If we already created a global with the same mangled name (but different
2159 // type) before, take its name and remove it from its parent.
2161 GV->takeName(Entry);
2163 if (!Entry->use_empty()) {
2164 llvm::Constant *NewPtrForOldDecl =
2165 llvm::ConstantExpr::getBitCast(GV, Entry->getType());
2166 Entry->replaceAllUsesWith(NewPtrForOldDecl);
2169 Entry->eraseFromParent();
2172 // This is the first use or definition of a mangled name. If there is a
2173 // deferred decl with this name, remember that we need to emit it at the end
2175 auto DDI = DeferredDecls.find(MangledName);
2176 if (DDI != DeferredDecls.end()) {
2177 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit
2178 // list, and remove it from DeferredDecls (since we don't need it anymore).
2179 addDeferredDeclToEmit(GV, DDI->second);
2180 DeferredDecls.erase(DDI);
2183 // Handle things which are present even on external declarations.
2185 // FIXME: This code is overly simple and should be merged with other global
2187 GV->setConstant(isTypeConstant(D->getType(), false));
2189 GV->setAlignment(getContext().getDeclAlign(D).getQuantity());
2191 setLinkageAndVisibilityForGV(GV, D);
2193 if (D->getTLSKind()) {
2194 if (D->getTLSKind() == VarDecl::TLS_Dynamic)
2195 CXXThreadLocals.push_back(D);
2199 // If required by the ABI, treat declarations of static data members with
2200 // inline initializers as definitions.
2201 if (getContext().isMSStaticDataMemberInlineDefinition(D)) {
2202 EmitGlobalVarDefinition(D);
2205 // Handle XCore specific ABI requirements.
2206 if (getTriple().getArch() == llvm::Triple::xcore &&
2207 D->getLanguageLinkage() == CLanguageLinkage &&
2208 D->getType().isConstant(Context) &&
2209 isExternallyVisible(D->getLinkageAndVisibility().getLinkage()))
2210 GV->setSection(".cp.rodata");
2213 if (AddrSpace != Ty->getAddressSpace())
2214 return llvm::ConstantExpr::getAddrSpaceCast(GV, Ty);
2220 CodeGenModule::GetAddrOfGlobal(GlobalDecl GD,
2221 bool IsForDefinition) {
2222 if (isa<CXXConstructorDecl>(GD.getDecl()))
2223 return getAddrOfCXXStructor(cast<CXXConstructorDecl>(GD.getDecl()),
2224 getFromCtorType(GD.getCtorType()),
2225 /*FnInfo=*/nullptr, /*FnType=*/nullptr,
2226 /*DontDefer=*/false, IsForDefinition);
2227 else if (isa<CXXDestructorDecl>(GD.getDecl()))
2228 return getAddrOfCXXStructor(cast<CXXDestructorDecl>(GD.getDecl()),
2229 getFromDtorType(GD.getDtorType()),
2230 /*FnInfo=*/nullptr, /*FnType=*/nullptr,
2231 /*DontDefer=*/false, IsForDefinition);
2232 else if (isa<CXXMethodDecl>(GD.getDecl())) {
2233 auto FInfo = &getTypes().arrangeCXXMethodDeclaration(
2234 cast<CXXMethodDecl>(GD.getDecl()));
2235 auto Ty = getTypes().GetFunctionType(*FInfo);
2236 return GetAddrOfFunction(GD, Ty, /*ForVTable=*/false, /*DontDefer=*/false,
2238 } else if (isa<FunctionDecl>(GD.getDecl())) {
2239 const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
2240 llvm::FunctionType *Ty = getTypes().GetFunctionType(FI);
2241 return GetAddrOfFunction(GD, Ty, /*ForVTable=*/false, /*DontDefer=*/false,
2244 return GetAddrOfGlobalVar(cast<VarDecl>(GD.getDecl()), /*Ty=*/nullptr,
2248 llvm::GlobalVariable *
2249 CodeGenModule::CreateOrReplaceCXXRuntimeVariable(StringRef Name,
2251 llvm::GlobalValue::LinkageTypes Linkage) {
2252 llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name);
2253 llvm::GlobalVariable *OldGV = nullptr;
2256 // Check if the variable has the right type.
2257 if (GV->getType()->getElementType() == Ty)
2260 // Because C++ name mangling, the only way we can end up with an already
2261 // existing global with the same name is if it has been declared extern "C".
2262 assert(GV->isDeclaration() && "Declaration has wrong type!");
2266 // Create a new variable.
2267 GV = new llvm::GlobalVariable(getModule(), Ty, /*isConstant=*/true,
2268 Linkage, nullptr, Name);
2271 // Replace occurrences of the old variable if needed.
2272 GV->takeName(OldGV);
2274 if (!OldGV->use_empty()) {
2275 llvm::Constant *NewPtrForOldDecl =
2276 llvm::ConstantExpr::getBitCast(GV, OldGV->getType());
2277 OldGV->replaceAllUsesWith(NewPtrForOldDecl);
2280 OldGV->eraseFromParent();
2283 if (supportsCOMDAT() && GV->isWeakForLinker() &&
2284 !GV->hasAvailableExternallyLinkage())
2285 GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
2290 /// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the
2291 /// given global variable. If Ty is non-null and if the global doesn't exist,
2292 /// then it will be created with the specified type instead of whatever the
2293 /// normal requested type would be. If IsForDefinition is true, it is guranteed
2294 /// that an actual global with type Ty will be returned, not conversion of a
2295 /// variable with the same mangled name but some other type.
2296 llvm::Constant *CodeGenModule::GetAddrOfGlobalVar(const VarDecl *D,
2298 bool IsForDefinition) {
2299 assert(D->hasGlobalStorage() && "Not a global variable");
2300 QualType ASTTy = D->getType();
2302 Ty = getTypes().ConvertTypeForMem(ASTTy);
2304 llvm::PointerType *PTy =
2305 llvm::PointerType::get(Ty, getContext().getTargetAddressSpace(ASTTy));
2307 StringRef MangledName = getMangledName(D);
2308 return GetOrCreateLLVMGlobal(MangledName, PTy, D, IsForDefinition);
2311 /// CreateRuntimeVariable - Create a new runtime global variable with the
2312 /// specified type and name.
2314 CodeGenModule::CreateRuntimeVariable(llvm::Type *Ty,
2316 return GetOrCreateLLVMGlobal(Name, llvm::PointerType::getUnqual(Ty), nullptr);
2319 void CodeGenModule::EmitTentativeDefinition(const VarDecl *D) {
2320 assert(!D->getInit() && "Cannot emit definite definitions here!");
2322 StringRef MangledName = getMangledName(D);
2323 llvm::GlobalValue *GV = GetGlobalValue(MangledName);
2325 // We already have a definition, not declaration, with the same mangled name.
2326 // Emitting of declaration is not required (and actually overwrites emitted
2328 if (GV && !GV->isDeclaration())
2331 // If we have not seen a reference to this variable yet, place it into the
2332 // deferred declarations table to be emitted if needed later.
2333 if (!MustBeEmitted(D) && !GV) {
2334 DeferredDecls[MangledName] = D;
2338 // The tentative definition is the only definition.
2339 EmitGlobalVarDefinition(D);
2342 CharUnits CodeGenModule::GetTargetTypeStoreSize(llvm::Type *Ty) const {
2343 return Context.toCharUnitsFromBits(
2344 getDataLayout().getTypeStoreSizeInBits(Ty));
2347 unsigned CodeGenModule::GetGlobalVarAddressSpace(const VarDecl *D,
2348 unsigned AddrSpace) {
2349 if (D && LangOpts.CUDA && LangOpts.CUDAIsDevice) {
2350 if (D->hasAttr<CUDAConstantAttr>())
2351 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_constant);
2352 else if (D->hasAttr<CUDASharedAttr>())
2353 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_shared);
2355 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_device);
2361 template<typename SomeDecl>
2362 void CodeGenModule::MaybeHandleStaticInExternC(const SomeDecl *D,
2363 llvm::GlobalValue *GV) {
2364 if (!getLangOpts().CPlusPlus)
2367 // Must have 'used' attribute, or else inline assembly can't rely on
2368 // the name existing.
2369 if (!D->template hasAttr<UsedAttr>())
2372 // Must have internal linkage and an ordinary name.
2373 if (!D->getIdentifier() || D->getFormalLinkage() != InternalLinkage)
2376 // Must be in an extern "C" context. Entities declared directly within
2377 // a record are not extern "C" even if the record is in such a context.
2378 const SomeDecl *First = D->getFirstDecl();
2379 if (First->getDeclContext()->isRecord() || !First->isInExternCContext())
2382 // OK, this is an internal linkage entity inside an extern "C" linkage
2383 // specification. Make a note of that so we can give it the "expected"
2384 // mangled name if nothing else is using that name.
2385 std::pair<StaticExternCMap::iterator, bool> R =
2386 StaticExternCValues.insert(std::make_pair(D->getIdentifier(), GV));
2388 // If we have multiple internal linkage entities with the same name
2389 // in extern "C" regions, none of them gets that name.
2391 R.first->second = nullptr;
2394 static bool shouldBeInCOMDAT(CodeGenModule &CGM, const Decl &D) {
2395 if (!CGM.supportsCOMDAT())
2398 if (D.hasAttr<SelectAnyAttr>())
2402 if (auto *VD = dyn_cast<VarDecl>(&D))
2403 Linkage = CGM.getContext().GetGVALinkageForVariable(VD);
2405 Linkage = CGM.getContext().GetGVALinkageForFunction(cast<FunctionDecl>(&D));
2409 case GVA_AvailableExternally:
2410 case GVA_StrongExternal:
2412 case GVA_DiscardableODR:
2416 llvm_unreachable("No such linkage");
2419 void CodeGenModule::maybeSetTrivialComdat(const Decl &D,
2420 llvm::GlobalObject &GO) {
2421 if (!shouldBeInCOMDAT(*this, D))
2423 GO.setComdat(TheModule.getOrInsertComdat(GO.getName()));
2426 /// Pass IsTentative as true if you want to create a tentative definition.
2427 void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D,
2429 // OpenCL global variables of sampler type are translated to function calls,
2430 // therefore no need to be translated.
2431 QualType ASTTy = D->getType();
2432 if (getLangOpts().OpenCL && ASTTy->isSamplerT())
2435 llvm::Constant *Init = nullptr;
2436 CXXRecordDecl *RD = ASTTy->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
2437 bool NeedsGlobalCtor = false;
2438 bool NeedsGlobalDtor = RD && !RD->hasTrivialDestructor();
2440 const VarDecl *InitDecl;
2441 const Expr *InitExpr = D->getAnyInitializer(InitDecl);
2443 // CUDA E.2.4.1 "__shared__ variables cannot have an initialization
2444 // as part of their declaration." Sema has already checked for
2445 // error cases, so we just need to set Init to UndefValue.
2446 if (getLangOpts().CUDA && getLangOpts().CUDAIsDevice &&
2447 D->hasAttr<CUDASharedAttr>())
2448 Init = llvm::UndefValue::get(getTypes().ConvertType(ASTTy));
2449 else if (!InitExpr) {
2450 // This is a tentative definition; tentative definitions are
2451 // implicitly initialized with { 0 }.
2453 // Note that tentative definitions are only emitted at the end of
2454 // a translation unit, so they should never have incomplete
2455 // type. In addition, EmitTentativeDefinition makes sure that we
2456 // never attempt to emit a tentative definition if a real one
2457 // exists. A use may still exists, however, so we still may need
2459 assert(!ASTTy->isIncompleteType() && "Unexpected incomplete type");
2460 Init = EmitNullConstant(D->getType());
2462 initializedGlobalDecl = GlobalDecl(D);
2463 Init = EmitConstantInit(*InitDecl);
2466 QualType T = InitExpr->getType();
2467 if (D->getType()->isReferenceType())
2470 if (getLangOpts().CPlusPlus) {
2471 Init = EmitNullConstant(T);
2472 NeedsGlobalCtor = true;
2474 ErrorUnsupported(D, "static initializer");
2475 Init = llvm::UndefValue::get(getTypes().ConvertType(T));
2478 // We don't need an initializer, so remove the entry for the delayed
2479 // initializer position (just in case this entry was delayed) if we
2480 // also don't need to register a destructor.
2481 if (getLangOpts().CPlusPlus && !NeedsGlobalDtor)
2482 DelayedCXXInitPosition.erase(D);
2486 llvm::Type* InitType = Init->getType();
2487 llvm::Constant *Entry =
2488 GetAddrOfGlobalVar(D, InitType, /*IsForDefinition=*/!IsTentative);
2490 // Strip off a bitcast if we got one back.
2491 if (auto *CE = dyn_cast<llvm::ConstantExpr>(Entry)) {
2492 assert(CE->getOpcode() == llvm::Instruction::BitCast ||
2493 CE->getOpcode() == llvm::Instruction::AddrSpaceCast ||
2494 // All zero index gep.
2495 CE->getOpcode() == llvm::Instruction::GetElementPtr);
2496 Entry = CE->getOperand(0);
2499 // Entry is now either a Function or GlobalVariable.
2500 auto *GV = dyn_cast<llvm::GlobalVariable>(Entry);
2502 // We have a definition after a declaration with the wrong type.
2503 // We must make a new GlobalVariable* and update everything that used OldGV
2504 // (a declaration or tentative definition) with the new GlobalVariable*
2505 // (which will be a definition).
2507 // This happens if there is a prototype for a global (e.g.
2508 // "extern int x[];") and then a definition of a different type (e.g.
2509 // "int x[10];"). This also happens when an initializer has a different type
2510 // from the type of the global (this happens with unions).
2512 GV->getType()->getElementType() != InitType ||
2513 GV->getType()->getAddressSpace() !=
2514 GetGlobalVarAddressSpace(D, getContext().getTargetAddressSpace(ASTTy))) {
2516 // Move the old entry aside so that we'll create a new one.
2517 Entry->setName(StringRef());
2519 // Make a new global with the correct type, this is now guaranteed to work.
2520 GV = cast<llvm::GlobalVariable>(
2521 GetAddrOfGlobalVar(D, InitType, /*IsForDefinition=*/!IsTentative));
2523 // Replace all uses of the old global with the new global
2524 llvm::Constant *NewPtrForOldDecl =
2525 llvm::ConstantExpr::getBitCast(GV, Entry->getType());
2526 Entry->replaceAllUsesWith(NewPtrForOldDecl);
2528 // Erase the old global, since it is no longer used.
2529 cast<llvm::GlobalValue>(Entry)->eraseFromParent();
2532 MaybeHandleStaticInExternC(D, GV);
2534 if (D->hasAttr<AnnotateAttr>())
2535 AddGlobalAnnotations(D, GV);
2537 // Set the llvm linkage type as appropriate.
2538 llvm::GlobalValue::LinkageTypes Linkage =
2539 getLLVMLinkageVarDefinition(D, GV->isConstant());
2541 // CUDA B.2.1 "The __device__ qualifier declares a variable that resides on
2542 // the device. [...]"
2543 // CUDA B.2.2 "The __constant__ qualifier, optionally used together with
2544 // __device__, declares a variable that: [...]
2545 // Is accessible from all the threads within the grid and from the host
2546 // through the runtime library (cudaGetSymbolAddress() / cudaGetSymbolSize()
2547 // / cudaMemcpyToSymbol() / cudaMemcpyFromSymbol())."
2548 if (GV && LangOpts.CUDA) {
2549 if (LangOpts.CUDAIsDevice) {
2550 if (D->hasAttr<CUDADeviceAttr>() || D->hasAttr<CUDAConstantAttr>())
2551 GV->setExternallyInitialized(true);
2553 // Host-side shadows of external declarations of device-side
2554 // global variables become internal definitions. These have to
2555 // be internal in order to prevent name conflicts with global
2556 // host variables with the same name in a different TUs.
2557 if (D->hasAttr<CUDADeviceAttr>() || D->hasAttr<CUDAConstantAttr>()) {
2558 Linkage = llvm::GlobalValue::InternalLinkage;
2560 // Shadow variables and their properties must be registered
2561 // with CUDA runtime.
2563 if (!D->hasDefinition())
2564 Flags |= CGCUDARuntime::ExternDeviceVar;
2565 if (D->hasAttr<CUDAConstantAttr>())
2566 Flags |= CGCUDARuntime::ConstantDeviceVar;
2567 getCUDARuntime().registerDeviceVar(*GV, Flags);
2568 } else if (D->hasAttr<CUDASharedAttr>())
2569 // __shared__ variables are odd. Shadows do get created, but
2570 // they are not registered with the CUDA runtime, so they
2571 // can't really be used to access their device-side
2572 // counterparts. It's not clear yet whether it's nvcc's bug or
2573 // a feature, but we've got to do the same for compatibility.
2574 Linkage = llvm::GlobalValue::InternalLinkage;
2577 GV->setInitializer(Init);
2579 // If it is safe to mark the global 'constant', do so now.
2580 GV->setConstant(!NeedsGlobalCtor && !NeedsGlobalDtor &&
2581 isTypeConstant(D->getType(), true));
2583 // If it is in a read-only section, mark it 'constant'.
2584 if (const SectionAttr *SA = D->getAttr<SectionAttr>()) {
2585 const ASTContext::SectionInfo &SI = Context.SectionInfos[SA->getName()];
2586 if ((SI.SectionFlags & ASTContext::PSF_Write) == 0)
2587 GV->setConstant(true);
2590 GV->setAlignment(getContext().getDeclAlign(D).getQuantity());
2593 // On Darwin, if the normal linkage of a C++ thread_local variable is
2594 // LinkOnce or Weak, we keep the normal linkage to prevent multiple
2595 // copies within a linkage unit; otherwise, the backing variable has
2596 // internal linkage and all accesses should just be calls to the
2597 // Itanium-specified entry point, which has the normal linkage of the
2598 // variable. This is to preserve the ability to change the implementation
2599 // behind the scenes.
2600 if (!D->isStaticLocal() && D->getTLSKind() == VarDecl::TLS_Dynamic &&
2601 Context.getTargetInfo().getTriple().isOSDarwin() &&
2602 !llvm::GlobalVariable::isLinkOnceLinkage(Linkage) &&
2603 !llvm::GlobalVariable::isWeakLinkage(Linkage))
2604 Linkage = llvm::GlobalValue::InternalLinkage;
2606 GV->setLinkage(Linkage);
2607 if (D->hasAttr<DLLImportAttr>())
2608 GV->setDLLStorageClass(llvm::GlobalVariable::DLLImportStorageClass);
2609 else if (D->hasAttr<DLLExportAttr>())
2610 GV->setDLLStorageClass(llvm::GlobalVariable::DLLExportStorageClass);
2612 GV->setDLLStorageClass(llvm::GlobalVariable::DefaultStorageClass);
2614 if (Linkage == llvm::GlobalVariable::CommonLinkage)
2615 // common vars aren't constant even if declared const.
2616 GV->setConstant(false);
2618 setNonAliasAttributes(D, GV);
2620 if (D->getTLSKind() && !GV->isThreadLocal()) {
2621 if (D->getTLSKind() == VarDecl::TLS_Dynamic)
2622 CXXThreadLocals.push_back(D);
2626 maybeSetTrivialComdat(*D, *GV);
2628 // Emit the initializer function if necessary.
2629 if (NeedsGlobalCtor || NeedsGlobalDtor)
2630 EmitCXXGlobalVarDeclInitFunc(D, GV, NeedsGlobalCtor);
2632 SanitizerMD->reportGlobalToASan(GV, *D, NeedsGlobalCtor);
2634 // Emit global variable debug information.
2635 if (CGDebugInfo *DI = getModuleDebugInfo())
2636 if (getCodeGenOpts().getDebugInfo() >= codegenoptions::LimitedDebugInfo)
2637 DI->EmitGlobalVariable(GV, D);
2640 static bool isVarDeclStrongDefinition(const ASTContext &Context,
2641 CodeGenModule &CGM, const VarDecl *D,
2643 // Don't give variables common linkage if -fno-common was specified unless it
2644 // was overridden by a NoCommon attribute.
2645 if ((NoCommon || D->hasAttr<NoCommonAttr>()) && !D->hasAttr<CommonAttr>())
2649 // A declaration of an identifier for an object that has file scope without
2650 // an initializer, and without a storage-class specifier or with the
2651 // storage-class specifier static, constitutes a tentative definition.
2652 if (D->getInit() || D->hasExternalStorage())
2655 // A variable cannot be both common and exist in a section.
2656 if (D->hasAttr<SectionAttr>())
2659 // Thread local vars aren't considered common linkage.
2660 if (D->getTLSKind())
2663 // Tentative definitions marked with WeakImportAttr are true definitions.
2664 if (D->hasAttr<WeakImportAttr>())
2667 // A variable cannot be both common and exist in a comdat.
2668 if (shouldBeInCOMDAT(CGM, *D))
2671 // Declarations with a required alignment do not have common linkage in MSVC
2673 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
2674 if (D->hasAttr<AlignedAttr>())
2676 QualType VarType = D->getType();
2677 if (Context.isAlignmentRequired(VarType))
2680 if (const auto *RT = VarType->getAs<RecordType>()) {
2681 const RecordDecl *RD = RT->getDecl();
2682 for (const FieldDecl *FD : RD->fields()) {
2683 if (FD->isBitField())
2685 if (FD->hasAttr<AlignedAttr>())
2687 if (Context.isAlignmentRequired(FD->getType()))
2696 llvm::GlobalValue::LinkageTypes CodeGenModule::getLLVMLinkageForDeclarator(
2697 const DeclaratorDecl *D, GVALinkage Linkage, bool IsConstantVariable) {
2698 if (Linkage == GVA_Internal)
2699 return llvm::Function::InternalLinkage;
2701 if (D->hasAttr<WeakAttr>()) {
2702 if (IsConstantVariable)
2703 return llvm::GlobalVariable::WeakODRLinkage;
2705 return llvm::GlobalVariable::WeakAnyLinkage;
2708 // We are guaranteed to have a strong definition somewhere else,
2709 // so we can use available_externally linkage.
2710 if (Linkage == GVA_AvailableExternally)
2711 return llvm::Function::AvailableExternallyLinkage;
2713 // Note that Apple's kernel linker doesn't support symbol
2714 // coalescing, so we need to avoid linkonce and weak linkages there.
2715 // Normally, this means we just map to internal, but for explicit
2716 // instantiations we'll map to external.
2718 // In C++, the compiler has to emit a definition in every translation unit
2719 // that references the function. We should use linkonce_odr because
2720 // a) if all references in this translation unit are optimized away, we
2721 // don't need to codegen it. b) if the function persists, it needs to be
2722 // merged with other definitions. c) C++ has the ODR, so we know the
2723 // definition is dependable.
2724 if (Linkage == GVA_DiscardableODR)
2725 return !Context.getLangOpts().AppleKext ? llvm::Function::LinkOnceODRLinkage
2726 : llvm::Function::InternalLinkage;
2728 // An explicit instantiation of a template has weak linkage, since
2729 // explicit instantiations can occur in multiple translation units
2730 // and must all be equivalent. However, we are not allowed to
2731 // throw away these explicit instantiations.
2733 // We don't currently support CUDA device code spread out across multiple TUs,
2734 // so say that CUDA templates are either external (for kernels) or internal.
2735 // This lets llvm perform aggressive inter-procedural optimizations.
2736 if (Linkage == GVA_StrongODR) {
2737 if (Context.getLangOpts().AppleKext)
2738 return llvm::Function::ExternalLinkage;
2739 if (Context.getLangOpts().CUDA && Context.getLangOpts().CUDAIsDevice)
2740 return D->hasAttr<CUDAGlobalAttr>() ? llvm::Function::ExternalLinkage
2741 : llvm::Function::InternalLinkage;
2742 return llvm::Function::WeakODRLinkage;
2745 // C++ doesn't have tentative definitions and thus cannot have common
2747 if (!getLangOpts().CPlusPlus && isa<VarDecl>(D) &&
2748 !isVarDeclStrongDefinition(Context, *this, cast<VarDecl>(D),
2749 CodeGenOpts.NoCommon))
2750 return llvm::GlobalVariable::CommonLinkage;
2752 // selectany symbols are externally visible, so use weak instead of
2753 // linkonce. MSVC optimizes away references to const selectany globals, so
2754 // all definitions should be the same and ODR linkage should be used.
2755 // http://msdn.microsoft.com/en-us/library/5tkz6s71.aspx
2756 if (D->hasAttr<SelectAnyAttr>())
2757 return llvm::GlobalVariable::WeakODRLinkage;
2759 // Otherwise, we have strong external linkage.
2760 assert(Linkage == GVA_StrongExternal);
2761 return llvm::GlobalVariable::ExternalLinkage;
2764 llvm::GlobalValue::LinkageTypes CodeGenModule::getLLVMLinkageVarDefinition(
2765 const VarDecl *VD, bool IsConstant) {
2766 GVALinkage Linkage = getContext().GetGVALinkageForVariable(VD);
2767 return getLLVMLinkageForDeclarator(VD, Linkage, IsConstant);
2770 /// Replace the uses of a function that was declared with a non-proto type.
2771 /// We want to silently drop extra arguments from call sites
2772 static void replaceUsesOfNonProtoConstant(llvm::Constant *old,
2773 llvm::Function *newFn) {
2775 if (old->use_empty()) return;
2777 llvm::Type *newRetTy = newFn->getReturnType();
2778 SmallVector<llvm::Value*, 4> newArgs;
2779 SmallVector<llvm::OperandBundleDef, 1> newBundles;
2781 for (llvm::Value::use_iterator ui = old->use_begin(), ue = old->use_end();
2783 llvm::Value::use_iterator use = ui++; // Increment before the use is erased.
2784 llvm::User *user = use->getUser();
2786 // Recognize and replace uses of bitcasts. Most calls to
2787 // unprototyped functions will use bitcasts.
2788 if (auto *bitcast = dyn_cast<llvm::ConstantExpr>(user)) {
2789 if (bitcast->getOpcode() == llvm::Instruction::BitCast)
2790 replaceUsesOfNonProtoConstant(bitcast, newFn);
2794 // Recognize calls to the function.
2795 llvm::CallSite callSite(user);
2796 if (!callSite) continue;
2797 if (!callSite.isCallee(&*use)) continue;
2799 // If the return types don't match exactly, then we can't
2800 // transform this call unless it's dead.
2801 if (callSite->getType() != newRetTy && !callSite->use_empty())
2804 // Get the call site's attribute list.
2805 SmallVector<llvm::AttributeSet, 8> newAttrs;
2806 llvm::AttributeSet oldAttrs = callSite.getAttributes();
2808 // Collect any return attributes from the call.
2809 if (oldAttrs.hasAttributes(llvm::AttributeSet::ReturnIndex))
2811 llvm::AttributeSet::get(newFn->getContext(),
2812 oldAttrs.getRetAttributes()));
2814 // If the function was passed too few arguments, don't transform.
2815 unsigned newNumArgs = newFn->arg_size();
2816 if (callSite.arg_size() < newNumArgs) continue;
2818 // If extra arguments were passed, we silently drop them.
2819 // If any of the types mismatch, we don't transform.
2821 bool dontTransform = false;
2822 for (llvm::Function::arg_iterator ai = newFn->arg_begin(),
2823 ae = newFn->arg_end(); ai != ae; ++ai, ++argNo) {
2824 if (callSite.getArgument(argNo)->getType() != ai->getType()) {
2825 dontTransform = true;
2829 // Add any parameter attributes.
2830 if (oldAttrs.hasAttributes(argNo + 1))
2833 AttributeSet::get(newFn->getContext(),
2834 oldAttrs.getParamAttributes(argNo + 1)));
2839 if (oldAttrs.hasAttributes(llvm::AttributeSet::FunctionIndex))
2840 newAttrs.push_back(llvm::AttributeSet::get(newFn->getContext(),
2841 oldAttrs.getFnAttributes()));
2843 // Okay, we can transform this. Create the new call instruction and copy
2844 // over the required information.
2845 newArgs.append(callSite.arg_begin(), callSite.arg_begin() + argNo);
2847 // Copy over any operand bundles.
2848 callSite.getOperandBundlesAsDefs(newBundles);
2850 llvm::CallSite newCall;
2851 if (callSite.isCall()) {
2852 newCall = llvm::CallInst::Create(newFn, newArgs, newBundles, "",
2853 callSite.getInstruction());
2855 auto *oldInvoke = cast<llvm::InvokeInst>(callSite.getInstruction());
2856 newCall = llvm::InvokeInst::Create(newFn,
2857 oldInvoke->getNormalDest(),
2858 oldInvoke->getUnwindDest(),
2859 newArgs, newBundles, "",
2860 callSite.getInstruction());
2862 newArgs.clear(); // for the next iteration
2864 if (!newCall->getType()->isVoidTy())
2865 newCall->takeName(callSite.getInstruction());
2866 newCall.setAttributes(
2867 llvm::AttributeSet::get(newFn->getContext(), newAttrs));
2868 newCall.setCallingConv(callSite.getCallingConv());
2870 // Finally, remove the old call, replacing any uses with the new one.
2871 if (!callSite->use_empty())
2872 callSite->replaceAllUsesWith(newCall.getInstruction());
2874 // Copy debug location attached to CI.
2875 if (callSite->getDebugLoc())
2876 newCall->setDebugLoc(callSite->getDebugLoc());
2878 callSite->eraseFromParent();
2882 /// ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we
2883 /// implement a function with no prototype, e.g. "int foo() {}". If there are
2884 /// existing call uses of the old function in the module, this adjusts them to
2885 /// call the new function directly.
2887 /// This is not just a cleanup: the always_inline pass requires direct calls to
2888 /// functions to be able to inline them. If there is a bitcast in the way, it
2889 /// won't inline them. Instcombine normally deletes these calls, but it isn't
2891 static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old,
2892 llvm::Function *NewFn) {
2893 // If we're redefining a global as a function, don't transform it.
2894 if (!isa<llvm::Function>(Old)) return;
2896 replaceUsesOfNonProtoConstant(Old, NewFn);
2899 void CodeGenModule::HandleCXXStaticMemberVarInstantiation(VarDecl *VD) {
2900 auto DK = VD->isThisDeclarationADefinition();
2901 if (DK == VarDecl::Definition && VD->hasAttr<DLLImportAttr>())
2904 TemplateSpecializationKind TSK = VD->getTemplateSpecializationKind();
2905 // If we have a definition, this might be a deferred decl. If the
2906 // instantiation is explicit, make sure we emit it at the end.
2907 if (VD->getDefinition() && TSK == TSK_ExplicitInstantiationDefinition)
2908 GetAddrOfGlobalVar(VD);
2910 EmitTopLevelDecl(VD);
2913 void CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD,
2914 llvm::GlobalValue *GV) {
2915 const auto *D = cast<FunctionDecl>(GD.getDecl());
2917 // Compute the function info and LLVM type.
2918 const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
2919 llvm::FunctionType *Ty = getTypes().GetFunctionType(FI);
2921 // Get or create the prototype for the function.
2922 if (!GV || (GV->getType()->getElementType() != Ty))
2923 GV = cast<llvm::GlobalValue>(GetAddrOfFunction(GD, Ty, /*ForVTable=*/false,
2925 /*IsForDefinition=*/true));
2928 if (!GV->isDeclaration())
2931 // We need to set linkage and visibility on the function before
2932 // generating code for it because various parts of IR generation
2933 // want to propagate this information down (e.g. to local static
2935 auto *Fn = cast<llvm::Function>(GV);
2936 setFunctionLinkage(GD, Fn);
2937 setFunctionDLLStorageClass(GD, Fn);
2939 // FIXME: this is redundant with part of setFunctionDefinitionAttributes
2940 setGlobalVisibility(Fn, D);
2942 MaybeHandleStaticInExternC(D, Fn);
2944 maybeSetTrivialComdat(*D, *Fn);
2946 CodeGenFunction(*this).GenerateCode(D, Fn, FI);
2948 setFunctionDefinitionAttributes(D, Fn);
2949 SetLLVMFunctionAttributesForDefinition(D, Fn);
2951 if (const ConstructorAttr *CA = D->getAttr<ConstructorAttr>())
2952 AddGlobalCtor(Fn, CA->getPriority());
2953 if (const DestructorAttr *DA = D->getAttr<DestructorAttr>())
2954 AddGlobalDtor(Fn, DA->getPriority());
2955 if (D->hasAttr<AnnotateAttr>())
2956 AddGlobalAnnotations(D, Fn);
2959 void CodeGenModule::EmitAliasDefinition(GlobalDecl GD) {
2960 const auto *D = cast<ValueDecl>(GD.getDecl());
2961 const AliasAttr *AA = D->getAttr<AliasAttr>();
2962 assert(AA && "Not an alias?");
2964 StringRef MangledName = getMangledName(GD);
2966 if (AA->getAliasee() == MangledName) {
2967 Diags.Report(AA->getLocation(), diag::err_cyclic_alias) << 0;
2971 // If there is a definition in the module, then it wins over the alias.
2972 // This is dubious, but allow it to be safe. Just ignore the alias.
2973 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
2974 if (Entry && !Entry->isDeclaration())
2977 Aliases.push_back(GD);
2979 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType());
2981 // Create a reference to the named value. This ensures that it is emitted
2982 // if a deferred decl.
2983 llvm::Constant *Aliasee;
2984 if (isa<llvm::FunctionType>(DeclTy))
2985 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy, GD,
2986 /*ForVTable=*/false);
2988 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
2989 llvm::PointerType::getUnqual(DeclTy),
2992 // Create the new alias itself, but don't set a name yet.
2993 auto *GA = llvm::GlobalAlias::create(
2994 DeclTy, 0, llvm::Function::ExternalLinkage, "", Aliasee, &getModule());
2997 if (GA->getAliasee() == Entry) {
2998 Diags.Report(AA->getLocation(), diag::err_cyclic_alias) << 0;
3002 assert(Entry->isDeclaration());
3004 // If there is a declaration in the module, then we had an extern followed
3005 // by the alias, as in:
3006 // extern int test6();
3008 // int test6() __attribute__((alias("test7")));
3010 // Remove it and replace uses of it with the alias.
3011 GA->takeName(Entry);
3013 Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GA,
3015 Entry->eraseFromParent();
3017 GA->setName(MangledName);
3020 // Set attributes which are particular to an alias; this is a
3021 // specialization of the attributes which may be set on a global
3022 // variable/function.
3023 if (D->hasAttr<WeakAttr>() || D->hasAttr<WeakRefAttr>() ||
3024 D->isWeakImported()) {
3025 GA->setLinkage(llvm::Function::WeakAnyLinkage);
3028 if (const auto *VD = dyn_cast<VarDecl>(D))
3029 if (VD->getTLSKind())
3030 setTLSMode(GA, *VD);
3032 setAliasAttributes(D, GA);
3035 void CodeGenModule::emitIFuncDefinition(GlobalDecl GD) {
3036 const auto *D = cast<ValueDecl>(GD.getDecl());
3037 const IFuncAttr *IFA = D->getAttr<IFuncAttr>();
3038 assert(IFA && "Not an ifunc?");
3040 StringRef MangledName = getMangledName(GD);
3042 if (IFA->getResolver() == MangledName) {
3043 Diags.Report(IFA->getLocation(), diag::err_cyclic_alias) << 1;
3047 // Report an error if some definition overrides ifunc.
3048 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
3049 if (Entry && !Entry->isDeclaration()) {
3051 if (lookupRepresentativeDecl(MangledName, OtherGD) &&
3052 DiagnosedConflictingDefinitions.insert(GD).second) {
3053 Diags.Report(D->getLocation(), diag::err_duplicate_mangled_name);
3054 Diags.Report(OtherGD.getDecl()->getLocation(),
3055 diag::note_previous_definition);
3060 Aliases.push_back(GD);
3062 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType());
3063 llvm::Constant *Resolver =
3064 GetOrCreateLLVMFunction(IFA->getResolver(), DeclTy, GD,
3065 /*ForVTable=*/false);
3066 llvm::GlobalIFunc *GIF =
3067 llvm::GlobalIFunc::create(DeclTy, 0, llvm::Function::ExternalLinkage,
3068 "", Resolver, &getModule());
3070 if (GIF->getResolver() == Entry) {
3071 Diags.Report(IFA->getLocation(), diag::err_cyclic_alias) << 1;
3074 assert(Entry->isDeclaration());
3076 // If there is a declaration in the module, then we had an extern followed
3077 // by the ifunc, as in:
3078 // extern int test();
3080 // int test() __attribute__((ifunc("resolver")));
3082 // Remove it and replace uses of it with the ifunc.
3083 GIF->takeName(Entry);
3085 Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GIF,
3087 Entry->eraseFromParent();
3089 GIF->setName(MangledName);
3091 SetCommonAttributes(D, GIF);
3094 llvm::Function *CodeGenModule::getIntrinsic(unsigned IID,
3095 ArrayRef<llvm::Type*> Tys) {
3096 return llvm::Intrinsic::getDeclaration(&getModule(), (llvm::Intrinsic::ID)IID,
3100 static llvm::StringMapEntry<llvm::GlobalVariable *> &
3101 GetConstantCFStringEntry(llvm::StringMap<llvm::GlobalVariable *> &Map,
3102 const StringLiteral *Literal, bool TargetIsLSB,
3103 bool &IsUTF16, unsigned &StringLength) {
3104 StringRef String = Literal->getString();
3105 unsigned NumBytes = String.size();
3107 // Check for simple case.
3108 if (!Literal->containsNonAsciiOrNull()) {
3109 StringLength = NumBytes;
3110 return *Map.insert(std::make_pair(String, nullptr)).first;
3113 // Otherwise, convert the UTF8 literals into a string of shorts.
3116 SmallVector<llvm::UTF16, 128> ToBuf(NumBytes + 1); // +1 for ending nulls.
3117 const llvm::UTF8 *FromPtr = (const llvm::UTF8 *)String.data();
3118 llvm::UTF16 *ToPtr = &ToBuf[0];
3120 (void)llvm::ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes, &ToPtr,
3121 ToPtr + NumBytes, llvm::strictConversion);
3123 // ConvertUTF8toUTF16 returns the length in ToPtr.
3124 StringLength = ToPtr - &ToBuf[0];
3126 // Add an explicit null.
3128 return *Map.insert(std::make_pair(
3129 StringRef(reinterpret_cast<const char *>(ToBuf.data()),
3130 (StringLength + 1) * 2),
3134 static llvm::StringMapEntry<llvm::GlobalVariable *> &
3135 GetConstantStringEntry(llvm::StringMap<llvm::GlobalVariable *> &Map,
3136 const StringLiteral *Literal, unsigned &StringLength) {
3137 StringRef String = Literal->getString();
3138 StringLength = String.size();
3139 return *Map.insert(std::make_pair(String, nullptr)).first;
3143 CodeGenModule::GetAddrOfConstantCFString(const StringLiteral *Literal) {
3144 unsigned StringLength = 0;
3145 bool isUTF16 = false;
3146 llvm::StringMapEntry<llvm::GlobalVariable *> &Entry =
3147 GetConstantCFStringEntry(CFConstantStringMap, Literal,
3148 getDataLayout().isLittleEndian(), isUTF16,
3151 if (auto *C = Entry.second)
3152 return ConstantAddress(C, CharUnits::fromQuantity(C->getAlignment()));
3154 llvm::Constant *Zero = llvm::Constant::getNullValue(Int32Ty);
3155 llvm::Constant *Zeros[] = { Zero, Zero };
3157 // If we don't already have it, get __CFConstantStringClassReference.
3158 if (!CFConstantStringClassRef) {
3159 llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy);
3160 Ty = llvm::ArrayType::get(Ty, 0);
3161 llvm::Constant *GV =
3162 CreateRuntimeVariable(Ty, "__CFConstantStringClassReference");
3164 if (getTriple().isOSBinFormatCOFF()) {
3165 IdentifierInfo &II = getContext().Idents.get(GV->getName());
3166 TranslationUnitDecl *TUDecl = getContext().getTranslationUnitDecl();
3167 DeclContext *DC = TranslationUnitDecl::castToDeclContext(TUDecl);
3168 llvm::GlobalValue *CGV = cast<llvm::GlobalValue>(GV);
3170 const VarDecl *VD = nullptr;
3171 for (const auto &Result : DC->lookup(&II))
3172 if ((VD = dyn_cast<VarDecl>(Result)))
3175 if (!VD || !VD->hasAttr<DLLExportAttr>()) {
3176 CGV->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
3177 CGV->setLinkage(llvm::GlobalValue::ExternalLinkage);
3179 CGV->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
3180 CGV->setLinkage(llvm::GlobalValue::ExternalLinkage);
3184 // Decay array -> ptr
3185 CFConstantStringClassRef =
3186 llvm::ConstantExpr::getGetElementPtr(Ty, GV, Zeros);
3189 QualType CFTy = getContext().getCFConstantStringType();
3191 auto *STy = cast<llvm::StructType>(getTypes().ConvertType(CFTy));
3193 ConstantBuilder Builder(*this);
3194 auto Fields = Builder.beginStruct(STy);
3197 Fields.add(cast<llvm::ConstantExpr>(CFConstantStringClassRef));
3200 Fields.addInt(IntTy, isUTF16 ? 0x07d0 : 0x07C8);
3203 llvm::Constant *C = nullptr;
3205 auto Arr = llvm::makeArrayRef(
3206 reinterpret_cast<uint16_t *>(const_cast<char *>(Entry.first().data())),
3207 Entry.first().size() / 2);
3208 C = llvm::ConstantDataArray::get(VMContext, Arr);
3210 C = llvm::ConstantDataArray::getString(VMContext, Entry.first());
3213 // Note: -fwritable-strings doesn't make the backing store strings of
3214 // CFStrings writable. (See <rdar://problem/10657500>)
3216 new llvm::GlobalVariable(getModule(), C->getType(), /*isConstant=*/true,
3217 llvm::GlobalValue::PrivateLinkage, C, ".str");
3218 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
3219 // Don't enforce the target's minimum global alignment, since the only use
3220 // of the string is via this class initializer.
3221 CharUnits Align = isUTF16
3222 ? getContext().getTypeAlignInChars(getContext().ShortTy)
3223 : getContext().getTypeAlignInChars(getContext().CharTy);
3224 GV->setAlignment(Align.getQuantity());
3226 // FIXME: We set the section explicitly to avoid a bug in ld64 224.1.
3227 // Without it LLVM can merge the string with a non unnamed_addr one during
3228 // LTO. Doing that changes the section it ends in, which surprises ld64.
3229 if (getTriple().isOSBinFormatMachO())
3230 GV->setSection(isUTF16 ? "__TEXT,__ustring"
3231 : "__TEXT,__cstring,cstring_literals");
3234 llvm::Constant *Str =
3235 llvm::ConstantExpr::getGetElementPtr(GV->getValueType(), GV, Zeros);
3238 // Cast the UTF16 string to the correct type.
3239 Str = llvm::ConstantExpr::getBitCast(Str, Int8PtrTy);
3243 auto Ty = getTypes().ConvertType(getContext().LongTy);
3244 Fields.addInt(cast<llvm::IntegerType>(Ty), StringLength);
3246 CharUnits Alignment = getPointerAlign();
3249 GV = Fields.finishAndCreateGlobal("_unnamed_cfstring_", Alignment,
3250 /*isConstant=*/false,
3251 llvm::GlobalVariable::PrivateLinkage);
3252 switch (getTriple().getObjectFormat()) {
3253 case llvm::Triple::UnknownObjectFormat:
3254 llvm_unreachable("unknown file format");
3255 case llvm::Triple::COFF:
3256 case llvm::Triple::ELF:
3257 GV->setSection("cfstring");
3259 case llvm::Triple::MachO:
3260 GV->setSection("__DATA,__cfstring");
3265 return ConstantAddress(GV, Alignment);
3269 CodeGenModule::GetAddrOfConstantString(const StringLiteral *Literal) {
3270 unsigned StringLength = 0;
3271 llvm::StringMapEntry<llvm::GlobalVariable *> &Entry =
3272 GetConstantStringEntry(CFConstantStringMap, Literal, StringLength);
3274 if (auto *C = Entry.second)
3275 return ConstantAddress(C, CharUnits::fromQuantity(C->getAlignment()));
3277 llvm::Constant *Zero = llvm::Constant::getNullValue(Int32Ty);
3278 llvm::Constant *Zeros[] = { Zero, Zero };
3280 // If we don't already have it, get _NSConstantStringClassReference.
3281 if (!ConstantStringClassRef) {
3282 std::string StringClass(getLangOpts().ObjCConstantStringClass);
3283 llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy);
3285 if (LangOpts.ObjCRuntime.isNonFragile()) {
3287 StringClass.empty() ? "OBJC_CLASS_$_NSConstantString"
3288 : "OBJC_CLASS_$_" + StringClass;
3289 GV = getObjCRuntime().GetClassGlobal(str);
3290 // Make sure the result is of the correct type.
3291 llvm::Type *PTy = llvm::PointerType::getUnqual(Ty);
3292 V = llvm::ConstantExpr::getBitCast(GV, PTy);
3293 ConstantStringClassRef = V;
3296 StringClass.empty() ? "_NSConstantStringClassReference"
3297 : "_" + StringClass + "ClassReference";
3298 llvm::Type *PTy = llvm::ArrayType::get(Ty, 0);
3299 GV = CreateRuntimeVariable(PTy, str);
3300 // Decay array -> ptr
3301 V = llvm::ConstantExpr::getGetElementPtr(PTy, GV, Zeros);
3302 ConstantStringClassRef = V;
3305 V = ConstantStringClassRef;
3307 if (!NSConstantStringType) {
3308 // Construct the type for a constant NSString.
3309 RecordDecl *D = Context.buildImplicitRecord("__builtin_NSString");
3310 D->startDefinition();
3312 QualType FieldTypes[3];
3315 FieldTypes[0] = Context.getPointerType(Context.IntTy.withConst());
3317 FieldTypes[1] = Context.getPointerType(Context.CharTy.withConst());
3318 // unsigned int length;
3319 FieldTypes[2] = Context.UnsignedIntTy;
3322 for (unsigned i = 0; i < 3; ++i) {
3323 FieldDecl *Field = FieldDecl::Create(Context, D,
3325 SourceLocation(), nullptr,
3326 FieldTypes[i], /*TInfo=*/nullptr,
3327 /*BitWidth=*/nullptr,
3330 Field->setAccess(AS_public);
3334 D->completeDefinition();
3335 QualType NSTy = Context.getTagDeclType(D);
3336 NSConstantStringType = cast<llvm::StructType>(getTypes().ConvertType(NSTy));
3339 ConstantBuilder Builder(*this);
3340 auto Fields = Builder.beginStruct(NSConstantStringType);
3343 Fields.add(cast<llvm::ConstantExpr>(V));
3347 llvm::ConstantDataArray::getString(VMContext, Entry.first());
3349 llvm::GlobalValue::LinkageTypes Linkage = llvm::GlobalValue::PrivateLinkage;
3350 bool isConstant = !LangOpts.WritableStrings;
3352 auto *GV = new llvm::GlobalVariable(getModule(), C->getType(), isConstant,
3353 Linkage, C, ".str");
3354 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
3355 // Don't enforce the target's minimum global alignment, since the only use
3356 // of the string is via this class initializer.
3357 CharUnits Align = getContext().getTypeAlignInChars(getContext().CharTy);
3358 GV->setAlignment(Align.getQuantity());
3360 llvm::ConstantExpr::getGetElementPtr(GV->getValueType(), GV, Zeros));
3363 Fields.addInt(IntTy, StringLength);
3366 CharUnits Alignment = getPointerAlign();
3367 GV = Fields.finishAndCreateGlobal("_unnamed_nsstring_", Alignment,
3369 llvm::GlobalVariable::PrivateLinkage);
3370 const char *NSStringSection = "__OBJC,__cstring_object,regular,no_dead_strip";
3371 const char *NSStringNonFragileABISection =
3372 "__DATA,__objc_stringobj,regular,no_dead_strip";
3373 // FIXME. Fix section.
3374 GV->setSection(LangOpts.ObjCRuntime.isNonFragile()
3375 ? NSStringNonFragileABISection
3379 return ConstantAddress(GV, Alignment);
3382 QualType CodeGenModule::getObjCFastEnumerationStateType() {
3383 if (ObjCFastEnumerationStateType.isNull()) {
3384 RecordDecl *D = Context.buildImplicitRecord("__objcFastEnumerationState");
3385 D->startDefinition();
3387 QualType FieldTypes[] = {
3388 Context.UnsignedLongTy,
3389 Context.getPointerType(Context.getObjCIdType()),
3390 Context.getPointerType(Context.UnsignedLongTy),
3391 Context.getConstantArrayType(Context.UnsignedLongTy,
3392 llvm::APInt(32, 5), ArrayType::Normal, 0)
3395 for (size_t i = 0; i < 4; ++i) {
3396 FieldDecl *Field = FieldDecl::Create(Context,
3399 SourceLocation(), nullptr,
3400 FieldTypes[i], /*TInfo=*/nullptr,
3401 /*BitWidth=*/nullptr,
3404 Field->setAccess(AS_public);
3408 D->completeDefinition();
3409 ObjCFastEnumerationStateType = Context.getTagDeclType(D);
3412 return ObjCFastEnumerationStateType;
3416 CodeGenModule::GetConstantArrayFromStringLiteral(const StringLiteral *E) {
3417 assert(!E->getType()->isPointerType() && "Strings are always arrays");
3419 // Don't emit it as the address of the string, emit the string data itself
3420 // as an inline array.
3421 if (E->getCharByteWidth() == 1) {
3422 SmallString<64> Str(E->getString());
3424 // Resize the string to the right size, which is indicated by its type.
3425 const ConstantArrayType *CAT = Context.getAsConstantArrayType(E->getType());
3426 Str.resize(CAT->getSize().getZExtValue());
3427 return llvm::ConstantDataArray::getString(VMContext, Str, false);
3430 auto *AType = cast<llvm::ArrayType>(getTypes().ConvertType(E->getType()));
3431 llvm::Type *ElemTy = AType->getElementType();
3432 unsigned NumElements = AType->getNumElements();
3434 // Wide strings have either 2-byte or 4-byte elements.
3435 if (ElemTy->getPrimitiveSizeInBits() == 16) {
3436 SmallVector<uint16_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 assert(ElemTy->getPrimitiveSizeInBits() == 32);
3446 SmallVector<uint32_t, 32> Elements;
3447 Elements.reserve(NumElements);
3449 for(unsigned i = 0, e = E->getLength(); i != e; ++i)
3450 Elements.push_back(E->getCodeUnit(i));
3451 Elements.resize(NumElements);
3452 return llvm::ConstantDataArray::get(VMContext, Elements);
3455 static llvm::GlobalVariable *
3456 GenerateStringLiteral(llvm::Constant *C, llvm::GlobalValue::LinkageTypes LT,
3457 CodeGenModule &CGM, StringRef GlobalName,
3458 CharUnits Alignment) {
3459 // OpenCL v1.2 s6.5.3: a string literal is in the constant address space.
3460 unsigned AddrSpace = 0;
3461 if (CGM.getLangOpts().OpenCL)
3462 AddrSpace = CGM.getContext().getTargetAddressSpace(LangAS::opencl_constant);
3464 llvm::Module &M = CGM.getModule();
3465 // Create a global variable for this string
3466 auto *GV = new llvm::GlobalVariable(
3467 M, C->getType(), !CGM.getLangOpts().WritableStrings, LT, C, GlobalName,
3468 nullptr, llvm::GlobalVariable::NotThreadLocal, AddrSpace);
3469 GV->setAlignment(Alignment.getQuantity());
3470 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
3471 if (GV->isWeakForLinker()) {
3472 assert(CGM.supportsCOMDAT() && "Only COFF uses weak string literals");
3473 GV->setComdat(M.getOrInsertComdat(GV->getName()));
3479 /// GetAddrOfConstantStringFromLiteral - Return a pointer to a
3480 /// constant array for the given string literal.
3482 CodeGenModule::GetAddrOfConstantStringFromLiteral(const StringLiteral *S,
3484 CharUnits Alignment = getContext().getAlignOfGlobalVarInChars(S->getType());
3486 llvm::Constant *C = GetConstantArrayFromStringLiteral(S);
3487 llvm::GlobalVariable **Entry = nullptr;
3488 if (!LangOpts.WritableStrings) {
3489 Entry = &ConstantStringMap[C];
3490 if (auto GV = *Entry) {
3491 if (Alignment.getQuantity() > GV->getAlignment())
3492 GV->setAlignment(Alignment.getQuantity());
3493 return ConstantAddress(GV, Alignment);
3497 SmallString<256> MangledNameBuffer;
3498 StringRef GlobalVariableName;
3499 llvm::GlobalValue::LinkageTypes LT;
3501 // Mangle the string literal if the ABI allows for it. However, we cannot
3502 // do this if we are compiling with ASan or -fwritable-strings because they
3503 // rely on strings having normal linkage.
3504 if (!LangOpts.WritableStrings &&
3505 !LangOpts.Sanitize.has(SanitizerKind::Address) &&
3506 getCXXABI().getMangleContext().shouldMangleStringLiteral(S)) {
3507 llvm::raw_svector_ostream Out(MangledNameBuffer);
3508 getCXXABI().getMangleContext().mangleStringLiteral(S, Out);
3510 LT = llvm::GlobalValue::LinkOnceODRLinkage;
3511 GlobalVariableName = MangledNameBuffer;
3513 LT = llvm::GlobalValue::PrivateLinkage;
3514 GlobalVariableName = Name;
3517 auto GV = GenerateStringLiteral(C, LT, *this, GlobalVariableName, Alignment);
3521 SanitizerMD->reportGlobalToASan(GV, S->getStrTokenLoc(0), "<string literal>",
3523 return ConstantAddress(GV, Alignment);
3526 /// GetAddrOfConstantStringFromObjCEncode - Return a pointer to a constant
3527 /// array for the given ObjCEncodeExpr node.
3529 CodeGenModule::GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *E) {
3531 getContext().getObjCEncodingForType(E->getEncodedType(), Str);
3533 return GetAddrOfConstantCString(Str);
3536 /// GetAddrOfConstantCString - Returns a pointer to a character array containing
3537 /// the literal and a terminating '\0' character.
3538 /// The result has pointer to array type.
3539 ConstantAddress CodeGenModule::GetAddrOfConstantCString(
3540 const std::string &Str, const char *GlobalName) {
3541 StringRef StrWithNull(Str.c_str(), Str.size() + 1);
3542 CharUnits Alignment =
3543 getContext().getAlignOfGlobalVarInChars(getContext().CharTy);
3546 llvm::ConstantDataArray::getString(getLLVMContext(), StrWithNull, false);
3548 // Don't share any string literals if strings aren't constant.
3549 llvm::GlobalVariable **Entry = nullptr;
3550 if (!LangOpts.WritableStrings) {
3551 Entry = &ConstantStringMap[C];
3552 if (auto GV = *Entry) {
3553 if (Alignment.getQuantity() > GV->getAlignment())
3554 GV->setAlignment(Alignment.getQuantity());
3555 return ConstantAddress(GV, Alignment);
3559 // Get the default prefix if a name wasn't specified.
3561 GlobalName = ".str";
3562 // Create a global variable for this.
3563 auto GV = GenerateStringLiteral(C, llvm::GlobalValue::PrivateLinkage, *this,
3564 GlobalName, Alignment);
3567 return ConstantAddress(GV, Alignment);
3570 ConstantAddress CodeGenModule::GetAddrOfGlobalTemporary(
3571 const MaterializeTemporaryExpr *E, const Expr *Init) {
3572 assert((E->getStorageDuration() == SD_Static ||
3573 E->getStorageDuration() == SD_Thread) && "not a global temporary");
3574 const auto *VD = cast<VarDecl>(E->getExtendingDecl());
3576 // If we're not materializing a subobject of the temporary, keep the
3577 // cv-qualifiers from the type of the MaterializeTemporaryExpr.
3578 QualType MaterializedType = Init->getType();
3579 if (Init == E->GetTemporaryExpr())
3580 MaterializedType = E->getType();
3582 CharUnits Align = getContext().getTypeAlignInChars(MaterializedType);
3584 if (llvm::Constant *Slot = MaterializedGlobalTemporaryMap[E])
3585 return ConstantAddress(Slot, Align);
3587 // FIXME: If an externally-visible declaration extends multiple temporaries,
3588 // we need to give each temporary the same name in every translation unit (and
3589 // we also need to make the temporaries externally-visible).
3590 SmallString<256> Name;
3591 llvm::raw_svector_ostream Out(Name);
3592 getCXXABI().getMangleContext().mangleReferenceTemporary(
3593 VD, E->getManglingNumber(), Out);
3595 APValue *Value = nullptr;
3596 if (E->getStorageDuration() == SD_Static) {
3597 // We might have a cached constant initializer for this temporary. Note
3598 // that this might have a different value from the value computed by
3599 // evaluating the initializer if the surrounding constant expression
3600 // modifies the temporary.
3601 Value = getContext().getMaterializedTemporaryValue(E, false);
3602 if (Value && Value->isUninit())
3606 // Try evaluating it now, it might have a constant initializer.
3607 Expr::EvalResult EvalResult;
3608 if (!Value && Init->EvaluateAsRValue(EvalResult, getContext()) &&
3609 !EvalResult.hasSideEffects())
3610 Value = &EvalResult.Val;
3612 llvm::Constant *InitialValue = nullptr;
3613 bool Constant = false;
3616 // The temporary has a constant initializer, use it.
3617 InitialValue = EmitConstantValue(*Value, MaterializedType, nullptr);
3618 Constant = isTypeConstant(MaterializedType, /*ExcludeCtor*/Value);
3619 Type = InitialValue->getType();
3621 // No initializer, the initialization will be provided when we
3622 // initialize the declaration which performed lifetime extension.
3623 Type = getTypes().ConvertTypeForMem(MaterializedType);
3626 // Create a global variable for this lifetime-extended temporary.
3627 llvm::GlobalValue::LinkageTypes Linkage =
3628 getLLVMLinkageVarDefinition(VD, Constant);
3629 if (Linkage == llvm::GlobalVariable::ExternalLinkage) {
3630 const VarDecl *InitVD;
3631 if (VD->isStaticDataMember() && VD->getAnyInitializer(InitVD) &&
3632 isa<CXXRecordDecl>(InitVD->getLexicalDeclContext())) {
3633 // Temporaries defined inside a class get linkonce_odr linkage because the
3634 // class can be defined in multipe translation units.
3635 Linkage = llvm::GlobalVariable::LinkOnceODRLinkage;
3637 // There is no need for this temporary to have external linkage if the
3638 // VarDecl has external linkage.
3639 Linkage = llvm::GlobalVariable::InternalLinkage;
3642 unsigned AddrSpace = GetGlobalVarAddressSpace(
3643 VD, getContext().getTargetAddressSpace(MaterializedType));
3644 auto *GV = new llvm::GlobalVariable(
3645 getModule(), Type, Constant, Linkage, InitialValue, Name.c_str(),
3646 /*InsertBefore=*/nullptr, llvm::GlobalVariable::NotThreadLocal,
3648 setGlobalVisibility(GV, VD);
3649 GV->setAlignment(Align.getQuantity());
3650 if (supportsCOMDAT() && GV->isWeakForLinker())
3651 GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
3652 if (VD->getTLSKind())
3653 setTLSMode(GV, *VD);
3654 MaterializedGlobalTemporaryMap[E] = GV;
3655 return ConstantAddress(GV, Align);
3658 /// EmitObjCPropertyImplementations - Emit information for synthesized
3659 /// properties for an implementation.
3660 void CodeGenModule::EmitObjCPropertyImplementations(const
3661 ObjCImplementationDecl *D) {
3662 for (const auto *PID : D->property_impls()) {
3663 // Dynamic is just for type-checking.
3664 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) {
3665 ObjCPropertyDecl *PD = PID->getPropertyDecl();
3667 // Determine which methods need to be implemented, some may have
3668 // been overridden. Note that ::isPropertyAccessor is not the method
3669 // we want, that just indicates if the decl came from a
3670 // property. What we want to know is if the method is defined in
3671 // this implementation.
3672 if (!D->getInstanceMethod(PD->getGetterName()))
3673 CodeGenFunction(*this).GenerateObjCGetter(
3674 const_cast<ObjCImplementationDecl *>(D), PID);
3675 if (!PD->isReadOnly() &&
3676 !D->getInstanceMethod(PD->getSetterName()))
3677 CodeGenFunction(*this).GenerateObjCSetter(
3678 const_cast<ObjCImplementationDecl *>(D), PID);
3683 static bool needsDestructMethod(ObjCImplementationDecl *impl) {
3684 const ObjCInterfaceDecl *iface = impl->getClassInterface();
3685 for (const ObjCIvarDecl *ivar = iface->all_declared_ivar_begin();
3686 ivar; ivar = ivar->getNextIvar())
3687 if (ivar->getType().isDestructedType())
3693 static bool AllTrivialInitializers(CodeGenModule &CGM,
3694 ObjCImplementationDecl *D) {
3695 CodeGenFunction CGF(CGM);
3696 for (ObjCImplementationDecl::init_iterator B = D->init_begin(),
3697 E = D->init_end(); B != E; ++B) {
3698 CXXCtorInitializer *CtorInitExp = *B;
3699 Expr *Init = CtorInitExp->getInit();
3700 if (!CGF.isTrivialInitializer(Init))
3706 /// EmitObjCIvarInitializations - Emit information for ivar initialization
3707 /// for an implementation.
3708 void CodeGenModule::EmitObjCIvarInitializations(ObjCImplementationDecl *D) {
3709 // We might need a .cxx_destruct even if we don't have any ivar initializers.
3710 if (needsDestructMethod(D)) {
3711 IdentifierInfo *II = &getContext().Idents.get(".cxx_destruct");
3712 Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
3713 ObjCMethodDecl *DTORMethod =
3714 ObjCMethodDecl::Create(getContext(), D->getLocation(), D->getLocation(),
3715 cxxSelector, getContext().VoidTy, nullptr, D,
3716 /*isInstance=*/true, /*isVariadic=*/false,
3717 /*isPropertyAccessor=*/true, /*isImplicitlyDeclared=*/true,
3718 /*isDefined=*/false, ObjCMethodDecl::Required);
3719 D->addInstanceMethod(DTORMethod);
3720 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, DTORMethod, false);
3721 D->setHasDestructors(true);
3724 // If the implementation doesn't have any ivar initializers, we don't need
3725 // a .cxx_construct.
3726 if (D->getNumIvarInitializers() == 0 ||
3727 AllTrivialInitializers(*this, D))
3730 IdentifierInfo *II = &getContext().Idents.get(".cxx_construct");
3731 Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
3732 // The constructor returns 'self'.
3733 ObjCMethodDecl *CTORMethod = ObjCMethodDecl::Create(getContext(),
3737 getContext().getObjCIdType(),
3738 nullptr, D, /*isInstance=*/true,
3739 /*isVariadic=*/false,
3740 /*isPropertyAccessor=*/true,
3741 /*isImplicitlyDeclared=*/true,
3742 /*isDefined=*/false,
3743 ObjCMethodDecl::Required);
3744 D->addInstanceMethod(CTORMethod);
3745 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, CTORMethod, true);
3746 D->setHasNonZeroConstructors(true);
3749 // EmitLinkageSpec - Emit all declarations in a linkage spec.
3750 void CodeGenModule::EmitLinkageSpec(const LinkageSpecDecl *LSD) {
3751 if (LSD->getLanguage() != LinkageSpecDecl::lang_c &&
3752 LSD->getLanguage() != LinkageSpecDecl::lang_cxx) {
3753 ErrorUnsupported(LSD, "linkage spec");
3757 EmitDeclContext(LSD);
3760 void CodeGenModule::EmitDeclContext(const DeclContext *DC) {
3761 for (auto *I : DC->decls()) {
3762 // Unlike other DeclContexts, the contents of an ObjCImplDecl at TU scope
3763 // are themselves considered "top-level", so EmitTopLevelDecl on an
3764 // ObjCImplDecl does not recursively visit them. We need to do that in
3765 // case they're nested inside another construct (LinkageSpecDecl /
3766 // ExportDecl) that does stop them from being considered "top-level".
3767 if (auto *OID = dyn_cast<ObjCImplDecl>(I)) {
3768 for (auto *M : OID->methods())
3769 EmitTopLevelDecl(M);
3772 EmitTopLevelDecl(I);
3776 /// EmitTopLevelDecl - Emit code for a single top level declaration.
3777 void CodeGenModule::EmitTopLevelDecl(Decl *D) {
3778 // Ignore dependent declarations.
3779 if (D->getDeclContext() && D->getDeclContext()->isDependentContext())
3782 switch (D->getKind()) {
3783 case Decl::CXXConversion:
3784 case Decl::CXXMethod:
3785 case Decl::Function:
3786 // Skip function templates
3787 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() ||
3788 cast<FunctionDecl>(D)->isLateTemplateParsed())
3791 EmitGlobal(cast<FunctionDecl>(D));
3792 // Always provide some coverage mapping
3793 // even for the functions that aren't emitted.
3794 AddDeferredUnusedCoverageMapping(D);
3798 case Decl::Decomposition:
3799 // Skip variable templates
3800 if (cast<VarDecl>(D)->getDescribedVarTemplate())
3802 case Decl::VarTemplateSpecialization:
3803 EmitGlobal(cast<VarDecl>(D));
3804 if (auto *DD = dyn_cast<DecompositionDecl>(D))
3805 for (auto *B : DD->bindings())
3806 if (auto *HD = B->getHoldingVar())
3810 // Indirect fields from global anonymous structs and unions can be
3811 // ignored; only the actual variable requires IR gen support.
3812 case Decl::IndirectField:
3816 case Decl::Namespace:
3817 EmitDeclContext(cast<NamespaceDecl>(D));
3819 case Decl::CXXRecord:
3820 // Emit any static data members, they may be definitions.
3821 for (auto *I : cast<CXXRecordDecl>(D)->decls())
3822 if (isa<VarDecl>(I) || isa<CXXRecordDecl>(I))
3823 EmitTopLevelDecl(I);
3825 // No code generation needed.
3826 case Decl::UsingShadow:
3827 case Decl::ClassTemplate:
3828 case Decl::VarTemplate:
3829 case Decl::VarTemplatePartialSpecialization:
3830 case Decl::FunctionTemplate:
3831 case Decl::TypeAliasTemplate:
3835 case Decl::Using: // using X; [C++]
3836 if (CGDebugInfo *DI = getModuleDebugInfo())
3837 DI->EmitUsingDecl(cast<UsingDecl>(*D));
3839 case Decl::NamespaceAlias:
3840 if (CGDebugInfo *DI = getModuleDebugInfo())
3841 DI->EmitNamespaceAlias(cast<NamespaceAliasDecl>(*D));
3843 case Decl::UsingDirective: // using namespace X; [C++]
3844 if (CGDebugInfo *DI = getModuleDebugInfo())
3845 DI->EmitUsingDirective(cast<UsingDirectiveDecl>(*D));
3847 case Decl::CXXConstructor:
3848 // Skip function templates
3849 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() ||
3850 cast<FunctionDecl>(D)->isLateTemplateParsed())
3853 getCXXABI().EmitCXXConstructors(cast<CXXConstructorDecl>(D));
3855 case Decl::CXXDestructor:
3856 if (cast<FunctionDecl>(D)->isLateTemplateParsed())
3858 getCXXABI().EmitCXXDestructors(cast<CXXDestructorDecl>(D));
3861 case Decl::StaticAssert:
3865 // Objective-C Decls
3867 // Forward declarations, no (immediate) code generation.
3868 case Decl::ObjCInterface:
3869 case Decl::ObjCCategory:
3872 case Decl::ObjCProtocol: {
3873 auto *Proto = cast<ObjCProtocolDecl>(D);
3874 if (Proto->isThisDeclarationADefinition())
3875 ObjCRuntime->GenerateProtocol(Proto);
3879 case Decl::ObjCCategoryImpl:
3880 // Categories have properties but don't support synthesize so we
3881 // can ignore them here.
3882 ObjCRuntime->GenerateCategory(cast<ObjCCategoryImplDecl>(D));
3885 case Decl::ObjCImplementation: {
3886 auto *OMD = cast<ObjCImplementationDecl>(D);
3887 EmitObjCPropertyImplementations(OMD);
3888 EmitObjCIvarInitializations(OMD);
3889 ObjCRuntime->GenerateClass(OMD);
3890 // Emit global variable debug information.
3891 if (CGDebugInfo *DI = getModuleDebugInfo())
3892 if (getCodeGenOpts().getDebugInfo() >= codegenoptions::LimitedDebugInfo)
3893 DI->getOrCreateInterfaceType(getContext().getObjCInterfaceType(
3894 OMD->getClassInterface()), OMD->getLocation());
3897 case Decl::ObjCMethod: {
3898 auto *OMD = cast<ObjCMethodDecl>(D);
3899 // If this is not a prototype, emit the body.
3901 CodeGenFunction(*this).GenerateObjCMethod(OMD);
3904 case Decl::ObjCCompatibleAlias:
3905 ObjCRuntime->RegisterAlias(cast<ObjCCompatibleAliasDecl>(D));
3908 case Decl::PragmaComment: {
3909 const auto *PCD = cast<PragmaCommentDecl>(D);
3910 switch (PCD->getCommentKind()) {
3912 llvm_unreachable("unexpected pragma comment kind");
3914 AppendLinkerOptions(PCD->getArg());
3917 AddDependentLib(PCD->getArg());
3922 break; // We ignore all of these.
3927 case Decl::PragmaDetectMismatch: {
3928 const auto *PDMD = cast<PragmaDetectMismatchDecl>(D);
3929 AddDetectMismatch(PDMD->getName(), PDMD->getValue());
3933 case Decl::LinkageSpec:
3934 EmitLinkageSpec(cast<LinkageSpecDecl>(D));
3937 case Decl::FileScopeAsm: {
3938 // File-scope asm is ignored during device-side CUDA compilation.
3939 if (LangOpts.CUDA && LangOpts.CUDAIsDevice)
3941 // File-scope asm is ignored during device-side OpenMP compilation.
3942 if (LangOpts.OpenMPIsDevice)
3944 auto *AD = cast<FileScopeAsmDecl>(D);
3945 getModule().appendModuleInlineAsm(AD->getAsmString()->getString());
3949 case Decl::Import: {
3950 auto *Import = cast<ImportDecl>(D);
3952 // If we've already imported this module, we're done.
3953 if (!ImportedModules.insert(Import->getImportedModule()))
3956 // Emit debug information for direct imports.
3957 if (!Import->getImportedOwningModule()) {
3958 if (CGDebugInfo *DI = getModuleDebugInfo())
3959 DI->EmitImportDecl(*Import);
3962 // Find all of the submodules and emit the module initializers.
3963 llvm::SmallPtrSet<clang::Module *, 16> Visited;
3964 SmallVector<clang::Module *, 16> Stack;
3965 Visited.insert(Import->getImportedModule());
3966 Stack.push_back(Import->getImportedModule());
3968 while (!Stack.empty()) {
3969 clang::Module *Mod = Stack.pop_back_val();
3970 if (!EmittedModuleInitializers.insert(Mod).second)
3973 for (auto *D : Context.getModuleInitializers(Mod))
3974 EmitTopLevelDecl(D);
3976 // Visit the submodules of this module.
3977 for (clang::Module::submodule_iterator Sub = Mod->submodule_begin(),
3978 SubEnd = Mod->submodule_end();
3979 Sub != SubEnd; ++Sub) {
3980 // Skip explicit children; they need to be explicitly imported to emit
3981 // the initializers.
3982 if ((*Sub)->IsExplicit)
3985 if (Visited.insert(*Sub).second)
3986 Stack.push_back(*Sub);
3993 EmitDeclContext(cast<ExportDecl>(D));
3996 case Decl::OMPThreadPrivate:
3997 EmitOMPThreadPrivateDecl(cast<OMPThreadPrivateDecl>(D));
4000 case Decl::ClassTemplateSpecialization: {
4001 const auto *Spec = cast<ClassTemplateSpecializationDecl>(D);
4003 Spec->getSpecializationKind() == TSK_ExplicitInstantiationDefinition &&
4004 Spec->hasDefinition())
4005 DebugInfo->completeTemplateDefinition(*Spec);
4009 case Decl::OMPDeclareReduction:
4010 EmitOMPDeclareReduction(cast<OMPDeclareReductionDecl>(D));
4014 // Make sure we handled everything we should, every other kind is a
4015 // non-top-level decl. FIXME: Would be nice to have an isTopLevelDeclKind
4016 // function. Need to recode Decl::Kind to do that easily.
4017 assert(isa<TypeDecl>(D) && "Unsupported decl kind");
4022 void CodeGenModule::AddDeferredUnusedCoverageMapping(Decl *D) {
4023 // Do we need to generate coverage mapping?
4024 if (!CodeGenOpts.CoverageMapping)
4026 switch (D->getKind()) {
4027 case Decl::CXXConversion:
4028 case Decl::CXXMethod:
4029 case Decl::Function:
4030 case Decl::ObjCMethod:
4031 case Decl::CXXConstructor:
4032 case Decl::CXXDestructor: {
4033 if (!cast<FunctionDecl>(D)->doesThisDeclarationHaveABody())
4035 auto I = DeferredEmptyCoverageMappingDecls.find(D);
4036 if (I == DeferredEmptyCoverageMappingDecls.end())
4037 DeferredEmptyCoverageMappingDecls[D] = true;
4045 void CodeGenModule::ClearUnusedCoverageMapping(const Decl *D) {
4046 // Do we need to generate coverage mapping?
4047 if (!CodeGenOpts.CoverageMapping)
4049 if (const auto *Fn = dyn_cast<FunctionDecl>(D)) {
4050 if (Fn->isTemplateInstantiation())
4051 ClearUnusedCoverageMapping(Fn->getTemplateInstantiationPattern());
4053 auto I = DeferredEmptyCoverageMappingDecls.find(D);
4054 if (I == DeferredEmptyCoverageMappingDecls.end())
4055 DeferredEmptyCoverageMappingDecls[D] = false;
4060 void CodeGenModule::EmitDeferredUnusedCoverageMappings() {
4061 std::vector<const Decl *> DeferredDecls;
4062 for (const auto &I : DeferredEmptyCoverageMappingDecls) {
4065 DeferredDecls.push_back(I.first);
4067 // Sort the declarations by their location to make sure that the tests get a
4068 // predictable order for the coverage mapping for the unused declarations.
4069 if (CodeGenOpts.DumpCoverageMapping)
4070 std::sort(DeferredDecls.begin(), DeferredDecls.end(),
4071 [] (const Decl *LHS, const Decl *RHS) {
4072 return LHS->getLocStart() < RHS->getLocStart();
4074 for (const auto *D : DeferredDecls) {
4075 switch (D->getKind()) {
4076 case Decl::CXXConversion:
4077 case Decl::CXXMethod:
4078 case Decl::Function:
4079 case Decl::ObjCMethod: {
4080 CodeGenPGO PGO(*this);
4081 GlobalDecl GD(cast<FunctionDecl>(D));
4082 PGO.emitEmptyCounterMapping(D, getMangledName(GD),
4083 getFunctionLinkage(GD));
4086 case Decl::CXXConstructor: {
4087 CodeGenPGO PGO(*this);
4088 GlobalDecl GD(cast<CXXConstructorDecl>(D), Ctor_Base);
4089 PGO.emitEmptyCounterMapping(D, getMangledName(GD),
4090 getFunctionLinkage(GD));
4093 case Decl::CXXDestructor: {
4094 CodeGenPGO PGO(*this);
4095 GlobalDecl GD(cast<CXXDestructorDecl>(D), Dtor_Base);
4096 PGO.emitEmptyCounterMapping(D, getMangledName(GD),
4097 getFunctionLinkage(GD));
4106 /// Turns the given pointer into a constant.
4107 static llvm::Constant *GetPointerConstant(llvm::LLVMContext &Context,
4109 uintptr_t PtrInt = reinterpret_cast<uintptr_t>(Ptr);
4110 llvm::Type *i64 = llvm::Type::getInt64Ty(Context);
4111 return llvm::ConstantInt::get(i64, PtrInt);
4114 static void EmitGlobalDeclMetadata(CodeGenModule &CGM,
4115 llvm::NamedMDNode *&GlobalMetadata,
4117 llvm::GlobalValue *Addr) {
4118 if (!GlobalMetadata)
4120 CGM.getModule().getOrInsertNamedMetadata("clang.global.decl.ptrs");
4122 // TODO: should we report variant information for ctors/dtors?
4123 llvm::Metadata *Ops[] = {llvm::ConstantAsMetadata::get(Addr),
4124 llvm::ConstantAsMetadata::get(GetPointerConstant(
4125 CGM.getLLVMContext(), D.getDecl()))};
4126 GlobalMetadata->addOperand(llvm::MDNode::get(CGM.getLLVMContext(), Ops));
4129 /// For each function which is declared within an extern "C" region and marked
4130 /// as 'used', but has internal linkage, create an alias from the unmangled
4131 /// name to the mangled name if possible. People expect to be able to refer
4132 /// to such functions with an unmangled name from inline assembly within the
4133 /// same translation unit.
4134 void CodeGenModule::EmitStaticExternCAliases() {
4135 // Don't do anything if we're generating CUDA device code -- the NVPTX
4136 // assembly target doesn't support aliases.
4137 if (Context.getTargetInfo().getTriple().isNVPTX())
4139 for (auto &I : StaticExternCValues) {
4140 IdentifierInfo *Name = I.first;
4141 llvm::GlobalValue *Val = I.second;
4142 if (Val && !getModule().getNamedValue(Name->getName()))
4143 addUsedGlobal(llvm::GlobalAlias::create(Name->getName(), Val));
4147 bool CodeGenModule::lookupRepresentativeDecl(StringRef MangledName,
4148 GlobalDecl &Result) const {
4149 auto Res = Manglings.find(MangledName);
4150 if (Res == Manglings.end())
4152 Result = Res->getValue();
4156 /// Emits metadata nodes associating all the global values in the
4157 /// current module with the Decls they came from. This is useful for
4158 /// projects using IR gen as a subroutine.
4160 /// Since there's currently no way to associate an MDNode directly
4161 /// with an llvm::GlobalValue, we create a global named metadata
4162 /// with the name 'clang.global.decl.ptrs'.
4163 void CodeGenModule::EmitDeclMetadata() {
4164 llvm::NamedMDNode *GlobalMetadata = nullptr;
4166 for (auto &I : MangledDeclNames) {
4167 llvm::GlobalValue *Addr = getModule().getNamedValue(I.second);
4168 // Some mangled names don't necessarily have an associated GlobalValue
4169 // in this module, e.g. if we mangled it for DebugInfo.
4171 EmitGlobalDeclMetadata(*this, GlobalMetadata, I.first, Addr);
4175 /// Emits metadata nodes for all the local variables in the current
4177 void CodeGenFunction::EmitDeclMetadata() {
4178 if (LocalDeclMap.empty()) return;
4180 llvm::LLVMContext &Context = getLLVMContext();
4182 // Find the unique metadata ID for this name.
4183 unsigned DeclPtrKind = Context.getMDKindID("clang.decl.ptr");
4185 llvm::NamedMDNode *GlobalMetadata = nullptr;
4187 for (auto &I : LocalDeclMap) {
4188 const Decl *D = I.first;
4189 llvm::Value *Addr = I.second.getPointer();
4190 if (auto *Alloca = dyn_cast<llvm::AllocaInst>(Addr)) {
4191 llvm::Value *DAddr = GetPointerConstant(getLLVMContext(), D);
4192 Alloca->setMetadata(
4193 DeclPtrKind, llvm::MDNode::get(
4194 Context, llvm::ValueAsMetadata::getConstant(DAddr)));
4195 } else if (auto *GV = dyn_cast<llvm::GlobalValue>(Addr)) {
4196 GlobalDecl GD = GlobalDecl(cast<VarDecl>(D));
4197 EmitGlobalDeclMetadata(CGM, GlobalMetadata, GD, GV);
4202 void CodeGenModule::EmitVersionIdentMetadata() {
4203 llvm::NamedMDNode *IdentMetadata =
4204 TheModule.getOrInsertNamedMetadata("llvm.ident");
4205 std::string Version = getClangFullVersion();
4206 llvm::LLVMContext &Ctx = TheModule.getContext();
4208 llvm::Metadata *IdentNode[] = {llvm::MDString::get(Ctx, Version)};
4209 IdentMetadata->addOperand(llvm::MDNode::get(Ctx, IdentNode));
4212 void CodeGenModule::EmitTargetMetadata() {
4213 // Warning, new MangledDeclNames may be appended within this loop.
4214 // We rely on MapVector insertions adding new elements to the end
4215 // of the container.
4216 // FIXME: Move this loop into the one target that needs it, and only
4217 // loop over those declarations for which we couldn't emit the target
4218 // metadata when we emitted the declaration.
4219 for (unsigned I = 0; I != MangledDeclNames.size(); ++I) {
4220 auto Val = *(MangledDeclNames.begin() + I);
4221 const Decl *D = Val.first.getDecl()->getMostRecentDecl();
4222 llvm::GlobalValue *GV = GetGlobalValue(Val.second);
4223 getTargetCodeGenInfo().emitTargetMD(D, GV, *this);
4227 void CodeGenModule::EmitCoverageFile() {
4228 if (getCodeGenOpts().CoverageDataFile.empty() &&
4229 getCodeGenOpts().CoverageNotesFile.empty())
4232 llvm::NamedMDNode *CUNode = TheModule.getNamedMetadata("llvm.dbg.cu");
4236 llvm::NamedMDNode *GCov = TheModule.getOrInsertNamedMetadata("llvm.gcov");
4237 llvm::LLVMContext &Ctx = TheModule.getContext();
4238 auto *CoverageDataFile =
4239 llvm::MDString::get(Ctx, getCodeGenOpts().CoverageDataFile);
4240 auto *CoverageNotesFile =
4241 llvm::MDString::get(Ctx, getCodeGenOpts().CoverageNotesFile);
4242 for (int i = 0, e = CUNode->getNumOperands(); i != e; ++i) {
4243 llvm::MDNode *CU = CUNode->getOperand(i);
4244 llvm::Metadata *Elts[] = {CoverageNotesFile, CoverageDataFile, CU};
4245 GCov->addOperand(llvm::MDNode::get(Ctx, Elts));
4249 llvm::Constant *CodeGenModule::EmitUuidofInitializer(StringRef Uuid) {
4250 // Sema has checked that all uuid strings are of the form
4251 // "12345678-1234-1234-1234-1234567890ab".
4252 assert(Uuid.size() == 36);
4253 for (unsigned i = 0; i < 36; ++i) {
4254 if (i == 8 || i == 13 || i == 18 || i == 23) assert(Uuid[i] == '-');
4255 else assert(isHexDigit(Uuid[i]));
4258 // The starts of all bytes of Field3 in Uuid. Field 3 is "1234-1234567890ab".
4259 const unsigned Field3ValueOffsets[8] = { 19, 21, 24, 26, 28, 30, 32, 34 };
4261 llvm::Constant *Field3[8];
4262 for (unsigned Idx = 0; Idx < 8; ++Idx)
4263 Field3[Idx] = llvm::ConstantInt::get(
4264 Int8Ty, Uuid.substr(Field3ValueOffsets[Idx], 2), 16);
4266 llvm::Constant *Fields[4] = {
4267 llvm::ConstantInt::get(Int32Ty, Uuid.substr(0, 8), 16),
4268 llvm::ConstantInt::get(Int16Ty, Uuid.substr(9, 4), 16),
4269 llvm::ConstantInt::get(Int16Ty, Uuid.substr(14, 4), 16),
4270 llvm::ConstantArray::get(llvm::ArrayType::get(Int8Ty, 8), Field3)
4273 return llvm::ConstantStruct::getAnon(Fields);
4276 llvm::Constant *CodeGenModule::GetAddrOfRTTIDescriptor(QualType Ty,
4278 // Return a bogus pointer if RTTI is disabled, unless it's for EH.
4279 // FIXME: should we even be calling this method if RTTI is disabled
4280 // and it's not for EH?
4281 if (!ForEH && !getLangOpts().RTTI)
4282 return llvm::Constant::getNullValue(Int8PtrTy);
4284 if (ForEH && Ty->isObjCObjectPointerType() &&
4285 LangOpts.ObjCRuntime.isGNUFamily())
4286 return ObjCRuntime->GetEHType(Ty);
4288 return getCXXABI().getAddrOfRTTIDescriptor(Ty);
4291 void CodeGenModule::EmitOMPThreadPrivateDecl(const OMPThreadPrivateDecl *D) {
4292 for (auto RefExpr : D->varlists()) {
4293 auto *VD = cast<VarDecl>(cast<DeclRefExpr>(RefExpr)->getDecl());
4295 VD->getAnyInitializer() &&
4296 !VD->getAnyInitializer()->isConstantInitializer(getContext(),
4299 Address Addr(GetAddrOfGlobalVar(VD), getContext().getDeclAlign(VD));
4300 if (auto InitFunction = getOpenMPRuntime().emitThreadPrivateVarDefinition(
4301 VD, Addr, RefExpr->getLocStart(), PerformInit))
4302 CXXGlobalInits.push_back(InitFunction);
4306 llvm::Metadata *CodeGenModule::CreateMetadataIdentifierForType(QualType T) {
4307 llvm::Metadata *&InternalId = MetadataIdMap[T.getCanonicalType()];
4311 if (isExternallyVisible(T->getLinkage())) {
4312 std::string OutName;
4313 llvm::raw_string_ostream Out(OutName);
4314 getCXXABI().getMangleContext().mangleTypeName(T, Out);
4316 InternalId = llvm::MDString::get(getLLVMContext(), Out.str());
4318 InternalId = llvm::MDNode::getDistinct(getLLVMContext(),
4319 llvm::ArrayRef<llvm::Metadata *>());
4325 /// Returns whether this module needs the "all-vtables" type identifier.
4326 bool CodeGenModule::NeedAllVtablesTypeId() const {
4327 // Returns true if at least one of vtable-based CFI checkers is enabled and
4328 // is not in the trapping mode.
4329 return ((LangOpts.Sanitize.has(SanitizerKind::CFIVCall) &&
4330 !CodeGenOpts.SanitizeTrap.has(SanitizerKind::CFIVCall)) ||
4331 (LangOpts.Sanitize.has(SanitizerKind::CFINVCall) &&
4332 !CodeGenOpts.SanitizeTrap.has(SanitizerKind::CFINVCall)) ||
4333 (LangOpts.Sanitize.has(SanitizerKind::CFIDerivedCast) &&
4334 !CodeGenOpts.SanitizeTrap.has(SanitizerKind::CFIDerivedCast)) ||
4335 (LangOpts.Sanitize.has(SanitizerKind::CFIUnrelatedCast) &&
4336 !CodeGenOpts.SanitizeTrap.has(SanitizerKind::CFIUnrelatedCast)));
4339 void CodeGenModule::AddVTableTypeMetadata(llvm::GlobalVariable *VTable,
4341 const CXXRecordDecl *RD) {
4342 llvm::Metadata *MD =
4343 CreateMetadataIdentifierForType(QualType(RD->getTypeForDecl(), 0));
4344 VTable->addTypeMetadata(Offset.getQuantity(), MD);
4346 if (CodeGenOpts.SanitizeCfiCrossDso)
4347 if (auto CrossDsoTypeId = CreateCrossDsoCfiTypeId(MD))
4348 VTable->addTypeMetadata(Offset.getQuantity(),
4349 llvm::ConstantAsMetadata::get(CrossDsoTypeId));
4351 if (NeedAllVtablesTypeId()) {
4352 llvm::Metadata *MD = llvm::MDString::get(getLLVMContext(), "all-vtables");
4353 VTable->addTypeMetadata(Offset.getQuantity(), MD);
4357 // Fills in the supplied string map with the set of target features for the
4358 // passed in function.
4359 void CodeGenModule::getFunctionFeatureMap(llvm::StringMap<bool> &FeatureMap,
4360 const FunctionDecl *FD) {
4361 StringRef TargetCPU = Target.getTargetOpts().CPU;
4362 if (const auto *TD = FD->getAttr<TargetAttr>()) {
4363 // If we have a TargetAttr build up the feature map based on that.
4364 TargetAttr::ParsedTargetAttr ParsedAttr = TD->parse();
4366 // Make a copy of the features as passed on the command line into the
4367 // beginning of the additional features from the function to override.
4368 ParsedAttr.first.insert(ParsedAttr.first.begin(),
4369 Target.getTargetOpts().FeaturesAsWritten.begin(),
4370 Target.getTargetOpts().FeaturesAsWritten.end());
4372 if (ParsedAttr.second != "")
4373 TargetCPU = ParsedAttr.second;
4375 // Now populate the feature map, first with the TargetCPU which is either
4376 // the default or a new one from the target attribute string. Then we'll use
4377 // the passed in features (FeaturesAsWritten) along with the new ones from
4379 Target.initFeatureMap(FeatureMap, getDiags(), TargetCPU, ParsedAttr.first);
4381 Target.initFeatureMap(FeatureMap, getDiags(), TargetCPU,
4382 Target.getTargetOpts().Features);
4386 llvm::SanitizerStatReport &CodeGenModule::getSanStats() {
4388 SanStats = llvm::make_unique<llvm::SanitizerStatReport>(&getModule());
4393 CodeGenModule::createOpenCLIntToSamplerConversion(const Expr *E,
4394 CodeGenFunction &CGF) {
4395 llvm::Constant *C = EmitConstantExpr(E, E->getType(), &CGF);
4396 auto SamplerT = getOpenCLRuntime().getSamplerType();
4397 auto FTy = llvm::FunctionType::get(SamplerT, {C->getType()}, false);
4398 return CGF.Builder.CreateCall(CreateRuntimeFunction(FTy,
4399 "__translate_sampler_initializer"),