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 ConstantInitBuilder 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 ctor.finishAndAddTo(ctors);
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 // If we don't have a declaration to control inlining, the function isn't
879 // explicitly marked as alwaysinline for semantic reasons, and inlining is
880 // disabled, mark the function as noinline.
881 if (!F->hasFnAttribute(llvm::Attribute::AlwaysInline) &&
882 CodeGenOpts.getInlining() == CodeGenOptions::OnlyAlwaysInlining)
883 B.addAttribute(llvm::Attribute::NoInline);
885 F->addAttributes(llvm::AttributeSet::FunctionIndex,
886 llvm::AttributeSet::get(
888 llvm::AttributeSet::FunctionIndex, B));
892 if (D->hasAttr<OptimizeNoneAttr>()) {
893 B.addAttribute(llvm::Attribute::OptimizeNone);
895 // OptimizeNone implies noinline; we should not be inlining such functions.
896 B.addAttribute(llvm::Attribute::NoInline);
897 assert(!F->hasFnAttribute(llvm::Attribute::AlwaysInline) &&
898 "OptimizeNone and AlwaysInline on same function!");
900 // We still need to handle naked functions even though optnone subsumes
901 // much of their semantics.
902 if (D->hasAttr<NakedAttr>())
903 B.addAttribute(llvm::Attribute::Naked);
905 // OptimizeNone wins over OptimizeForSize and MinSize.
906 F->removeFnAttr(llvm::Attribute::OptimizeForSize);
907 F->removeFnAttr(llvm::Attribute::MinSize);
908 } else if (D->hasAttr<NakedAttr>()) {
909 // Naked implies noinline: we should not be inlining such functions.
910 B.addAttribute(llvm::Attribute::Naked);
911 B.addAttribute(llvm::Attribute::NoInline);
912 } else if (D->hasAttr<NoDuplicateAttr>()) {
913 B.addAttribute(llvm::Attribute::NoDuplicate);
914 } else if (D->hasAttr<NoInlineAttr>()) {
915 B.addAttribute(llvm::Attribute::NoInline);
916 } else if (D->hasAttr<AlwaysInlineAttr>() &&
917 !F->hasFnAttribute(llvm::Attribute::NoInline)) {
918 // (noinline wins over always_inline, and we can't specify both in IR)
919 B.addAttribute(llvm::Attribute::AlwaysInline);
920 } else if (CodeGenOpts.getInlining() == CodeGenOptions::OnlyAlwaysInlining) {
921 // If we're not inlining, then force everything that isn't always_inline to
922 // carry an explicit noinline attribute.
923 if (!F->hasFnAttribute(llvm::Attribute::AlwaysInline))
924 B.addAttribute(llvm::Attribute::NoInline);
926 // Otherwise, propagate the inline hint attribute and potentially use its
927 // absence to mark things as noinline.
928 if (auto *FD = dyn_cast<FunctionDecl>(D)) {
929 if (any_of(FD->redecls(), [&](const FunctionDecl *Redecl) {
930 return Redecl->isInlineSpecified();
932 B.addAttribute(llvm::Attribute::InlineHint);
933 } else if (CodeGenOpts.getInlining() ==
934 CodeGenOptions::OnlyHintInlining &&
936 !F->hasFnAttribute(llvm::Attribute::AlwaysInline)) {
937 B.addAttribute(llvm::Attribute::NoInline);
942 // Add other optimization related attributes if we are optimizing this
944 if (!D->hasAttr<OptimizeNoneAttr>()) {
945 if (D->hasAttr<ColdAttr>()) {
946 B.addAttribute(llvm::Attribute::OptimizeForSize);
947 B.addAttribute(llvm::Attribute::Cold);
950 if (D->hasAttr<MinSizeAttr>())
951 B.addAttribute(llvm::Attribute::MinSize);
954 F->addAttributes(llvm::AttributeSet::FunctionIndex,
955 llvm::AttributeSet::get(
956 F->getContext(), llvm::AttributeSet::FunctionIndex, B));
958 unsigned alignment = D->getMaxAlignment() / Context.getCharWidth();
960 F->setAlignment(alignment);
962 // Some C++ ABIs require 2-byte alignment for member functions, in order to
963 // reserve a bit for differentiating between virtual and non-virtual member
964 // functions. If the current target's C++ ABI requires this and this is a
965 // member function, set its alignment accordingly.
966 if (getTarget().getCXXABI().areMemberFunctionsAligned()) {
967 if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D))
971 // In the cross-dso CFI mode, we want !type attributes on definitions only.
972 if (CodeGenOpts.SanitizeCfiCrossDso)
973 if (auto *FD = dyn_cast<FunctionDecl>(D))
974 CreateFunctionTypeMetadata(FD, F);
977 void CodeGenModule::SetCommonAttributes(const Decl *D,
978 llvm::GlobalValue *GV) {
979 if (const auto *ND = dyn_cast_or_null<NamedDecl>(D))
980 setGlobalVisibility(GV, ND);
982 GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
984 if (D && D->hasAttr<UsedAttr>())
988 void CodeGenModule::setAliasAttributes(const Decl *D,
989 llvm::GlobalValue *GV) {
990 SetCommonAttributes(D, GV);
992 // Process the dllexport attribute based on whether the original definition
993 // (not necessarily the aliasee) was exported.
994 if (D->hasAttr<DLLExportAttr>())
995 GV->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
998 void CodeGenModule::setNonAliasAttributes(const Decl *D,
999 llvm::GlobalObject *GO) {
1000 SetCommonAttributes(D, GO);
1003 if (const SectionAttr *SA = D->getAttr<SectionAttr>())
1004 GO->setSection(SA->getName());
1006 getTargetCodeGenInfo().setTargetAttributes(D, GO, *this);
1009 void CodeGenModule::SetInternalFunctionAttributes(const Decl *D,
1011 const CGFunctionInfo &FI) {
1012 SetLLVMFunctionAttributes(D, FI, F);
1013 SetLLVMFunctionAttributesForDefinition(D, F);
1015 F->setLinkage(llvm::Function::InternalLinkage);
1017 setNonAliasAttributes(D, F);
1020 static void setLinkageAndVisibilityForGV(llvm::GlobalValue *GV,
1021 const NamedDecl *ND) {
1022 // Set linkage and visibility in case we never see a definition.
1023 LinkageInfo LV = ND->getLinkageAndVisibility();
1024 if (LV.getLinkage() != ExternalLinkage) {
1025 // Don't set internal linkage on declarations.
1027 if (ND->hasAttr<DLLImportAttr>()) {
1028 GV->setLinkage(llvm::GlobalValue::ExternalLinkage);
1029 GV->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
1030 } else if (ND->hasAttr<DLLExportAttr>()) {
1031 GV->setLinkage(llvm::GlobalValue::ExternalLinkage);
1032 GV->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
1033 } else if (ND->hasAttr<WeakAttr>() || ND->isWeakImported()) {
1034 // "extern_weak" is overloaded in LLVM; we probably should have
1035 // separate linkage types for this.
1036 GV->setLinkage(llvm::GlobalValue::ExternalWeakLinkage);
1039 // Set visibility on a declaration only if it's explicit.
1040 if (LV.isVisibilityExplicit())
1041 GV->setVisibility(CodeGenModule::GetLLVMVisibility(LV.getVisibility()));
1045 void CodeGenModule::CreateFunctionTypeMetadata(const FunctionDecl *FD,
1046 llvm::Function *F) {
1047 // Only if we are checking indirect calls.
1048 if (!LangOpts.Sanitize.has(SanitizerKind::CFIICall))
1051 // Non-static class methods are handled via vtable pointer checks elsewhere.
1052 if (isa<CXXMethodDecl>(FD) && !cast<CXXMethodDecl>(FD)->isStatic())
1055 // Additionally, if building with cross-DSO support...
1056 if (CodeGenOpts.SanitizeCfiCrossDso) {
1057 // Skip available_externally functions. They won't be codegen'ed in the
1058 // current module anyway.
1059 if (getContext().GetGVALinkageForFunction(FD) == GVA_AvailableExternally)
1063 llvm::Metadata *MD = CreateMetadataIdentifierForType(FD->getType());
1064 F->addTypeMetadata(0, MD);
1066 // Emit a hash-based bit set entry for cross-DSO calls.
1067 if (CodeGenOpts.SanitizeCfiCrossDso)
1068 if (auto CrossDsoTypeId = CreateCrossDsoCfiTypeId(MD))
1069 F->addTypeMetadata(0, llvm::ConstantAsMetadata::get(CrossDsoTypeId));
1072 void CodeGenModule::SetFunctionAttributes(GlobalDecl GD, llvm::Function *F,
1073 bool IsIncompleteFunction,
1075 if (llvm::Intrinsic::ID IID = F->getIntrinsicID()) {
1076 // If this is an intrinsic function, set the function's attributes
1077 // to the intrinsic's attributes.
1078 F->setAttributes(llvm::Intrinsic::getAttributes(getLLVMContext(), IID));
1082 const auto *FD = cast<FunctionDecl>(GD.getDecl());
1084 if (!IsIncompleteFunction)
1085 SetLLVMFunctionAttributes(FD, getTypes().arrangeGlobalDeclaration(GD), F);
1087 // Add the Returned attribute for "this", except for iOS 5 and earlier
1088 // where substantial code, including the libstdc++ dylib, was compiled with
1089 // GCC and does not actually return "this".
1090 if (!IsThunk && getCXXABI().HasThisReturn(GD) &&
1091 !(getTriple().isiOS() && getTriple().isOSVersionLT(6))) {
1092 assert(!F->arg_empty() &&
1093 F->arg_begin()->getType()
1094 ->canLosslesslyBitCastTo(F->getReturnType()) &&
1095 "unexpected this return");
1096 F->addAttribute(1, llvm::Attribute::Returned);
1099 // Only a few attributes are set on declarations; these may later be
1100 // overridden by a definition.
1102 setLinkageAndVisibilityForGV(F, FD);
1104 if (const SectionAttr *SA = FD->getAttr<SectionAttr>())
1105 F->setSection(SA->getName());
1107 if (FD->isReplaceableGlobalAllocationFunction()) {
1108 // A replaceable global allocation function does not act like a builtin by
1109 // default, only if it is invoked by a new-expression or delete-expression.
1110 F->addAttribute(llvm::AttributeSet::FunctionIndex,
1111 llvm::Attribute::NoBuiltin);
1113 // A sane operator new returns a non-aliasing pointer.
1114 // FIXME: Also add NonNull attribute to the return value
1115 // for the non-nothrow forms?
1116 auto Kind = FD->getDeclName().getCXXOverloadedOperator();
1117 if (getCodeGenOpts().AssumeSaneOperatorNew &&
1118 (Kind == OO_New || Kind == OO_Array_New))
1119 F->addAttribute(llvm::AttributeSet::ReturnIndex,
1120 llvm::Attribute::NoAlias);
1123 if (isa<CXXConstructorDecl>(FD) || isa<CXXDestructorDecl>(FD))
1124 F->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1125 else if (const auto *MD = dyn_cast<CXXMethodDecl>(FD))
1126 if (MD->isVirtual())
1127 F->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1129 // Don't emit entries for function declarations in the cross-DSO mode. This
1130 // is handled with better precision by the receiving DSO.
1131 if (!CodeGenOpts.SanitizeCfiCrossDso)
1132 CreateFunctionTypeMetadata(FD, F);
1135 void CodeGenModule::addUsedGlobal(llvm::GlobalValue *GV) {
1136 assert(!GV->isDeclaration() &&
1137 "Only globals with definition can force usage.");
1138 LLVMUsed.emplace_back(GV);
1141 void CodeGenModule::addCompilerUsedGlobal(llvm::GlobalValue *GV) {
1142 assert(!GV->isDeclaration() &&
1143 "Only globals with definition can force usage.");
1144 LLVMCompilerUsed.emplace_back(GV);
1147 static void emitUsed(CodeGenModule &CGM, StringRef Name,
1148 std::vector<llvm::WeakVH> &List) {
1149 // Don't create llvm.used if there is no need.
1153 // Convert List to what ConstantArray needs.
1154 SmallVector<llvm::Constant*, 8> UsedArray;
1155 UsedArray.resize(List.size());
1156 for (unsigned i = 0, e = List.size(); i != e; ++i) {
1158 llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(
1159 cast<llvm::Constant>(&*List[i]), CGM.Int8PtrTy);
1162 if (UsedArray.empty())
1164 llvm::ArrayType *ATy = llvm::ArrayType::get(CGM.Int8PtrTy, UsedArray.size());
1166 auto *GV = new llvm::GlobalVariable(
1167 CGM.getModule(), ATy, false, llvm::GlobalValue::AppendingLinkage,
1168 llvm::ConstantArray::get(ATy, UsedArray), Name);
1170 GV->setSection("llvm.metadata");
1173 void CodeGenModule::emitLLVMUsed() {
1174 emitUsed(*this, "llvm.used", LLVMUsed);
1175 emitUsed(*this, "llvm.compiler.used", LLVMCompilerUsed);
1178 void CodeGenModule::AppendLinkerOptions(StringRef Opts) {
1179 auto *MDOpts = llvm::MDString::get(getLLVMContext(), Opts);
1180 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
1183 void CodeGenModule::AddDetectMismatch(StringRef Name, StringRef Value) {
1184 llvm::SmallString<32> Opt;
1185 getTargetCodeGenInfo().getDetectMismatchOption(Name, Value, Opt);
1186 auto *MDOpts = llvm::MDString::get(getLLVMContext(), Opt);
1187 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
1190 void CodeGenModule::AddDependentLib(StringRef Lib) {
1191 llvm::SmallString<24> Opt;
1192 getTargetCodeGenInfo().getDependentLibraryOption(Lib, Opt);
1193 auto *MDOpts = llvm::MDString::get(getLLVMContext(), Opt);
1194 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
1197 /// \brief Add link options implied by the given module, including modules
1198 /// it depends on, using a postorder walk.
1199 static void addLinkOptionsPostorder(CodeGenModule &CGM, Module *Mod,
1200 SmallVectorImpl<llvm::Metadata *> &Metadata,
1201 llvm::SmallPtrSet<Module *, 16> &Visited) {
1202 // Import this module's parent.
1203 if (Mod->Parent && Visited.insert(Mod->Parent).second) {
1204 addLinkOptionsPostorder(CGM, Mod->Parent, Metadata, Visited);
1207 // Import this module's dependencies.
1208 for (unsigned I = Mod->Imports.size(); I > 0; --I) {
1209 if (Visited.insert(Mod->Imports[I - 1]).second)
1210 addLinkOptionsPostorder(CGM, Mod->Imports[I-1], Metadata, Visited);
1213 // Add linker options to link against the libraries/frameworks
1214 // described by this module.
1215 llvm::LLVMContext &Context = CGM.getLLVMContext();
1216 for (unsigned I = Mod->LinkLibraries.size(); I > 0; --I) {
1217 // Link against a framework. Frameworks are currently Darwin only, so we
1218 // don't to ask TargetCodeGenInfo for the spelling of the linker option.
1219 if (Mod->LinkLibraries[I-1].IsFramework) {
1220 llvm::Metadata *Args[2] = {
1221 llvm::MDString::get(Context, "-framework"),
1222 llvm::MDString::get(Context, Mod->LinkLibraries[I - 1].Library)};
1224 Metadata.push_back(llvm::MDNode::get(Context, Args));
1228 // Link against a library.
1229 llvm::SmallString<24> Opt;
1230 CGM.getTargetCodeGenInfo().getDependentLibraryOption(
1231 Mod->LinkLibraries[I-1].Library, Opt);
1232 auto *OptString = llvm::MDString::get(Context, Opt);
1233 Metadata.push_back(llvm::MDNode::get(Context, OptString));
1237 void CodeGenModule::EmitModuleLinkOptions() {
1238 // Collect the set of all of the modules we want to visit to emit link
1239 // options, which is essentially the imported modules and all of their
1240 // non-explicit child modules.
1241 llvm::SetVector<clang::Module *> LinkModules;
1242 llvm::SmallPtrSet<clang::Module *, 16> Visited;
1243 SmallVector<clang::Module *, 16> Stack;
1245 // Seed the stack with imported modules.
1246 for (Module *M : ImportedModules) {
1247 // Do not add any link flags when an implementation TU of a module imports
1248 // a header of that same module.
1249 if (M->getTopLevelModuleName() == getLangOpts().CurrentModule &&
1250 !getLangOpts().isCompilingModule())
1252 if (Visited.insert(M).second)
1256 // Find all of the modules to import, making a little effort to prune
1257 // non-leaf modules.
1258 while (!Stack.empty()) {
1259 clang::Module *Mod = Stack.pop_back_val();
1261 bool AnyChildren = false;
1263 // Visit the submodules of this module.
1264 for (clang::Module::submodule_iterator Sub = Mod->submodule_begin(),
1265 SubEnd = Mod->submodule_end();
1266 Sub != SubEnd; ++Sub) {
1267 // Skip explicit children; they need to be explicitly imported to be
1269 if ((*Sub)->IsExplicit)
1272 if (Visited.insert(*Sub).second) {
1273 Stack.push_back(*Sub);
1278 // We didn't find any children, so add this module to the list of
1279 // modules to link against.
1281 LinkModules.insert(Mod);
1285 // Add link options for all of the imported modules in reverse topological
1286 // order. We don't do anything to try to order import link flags with respect
1287 // to linker options inserted by things like #pragma comment().
1288 SmallVector<llvm::Metadata *, 16> MetadataArgs;
1290 for (Module *M : LinkModules)
1291 if (Visited.insert(M).second)
1292 addLinkOptionsPostorder(*this, M, MetadataArgs, Visited);
1293 std::reverse(MetadataArgs.begin(), MetadataArgs.end());
1294 LinkerOptionsMetadata.append(MetadataArgs.begin(), MetadataArgs.end());
1296 // Add the linker options metadata flag.
1297 getModule().addModuleFlag(llvm::Module::AppendUnique, "Linker Options",
1298 llvm::MDNode::get(getLLVMContext(),
1299 LinkerOptionsMetadata));
1302 void CodeGenModule::EmitDeferred() {
1303 // Emit code for any potentially referenced deferred decls. Since a
1304 // previously unused static decl may become used during the generation of code
1305 // for a static function, iterate until no changes are made.
1307 if (!DeferredVTables.empty()) {
1308 EmitDeferredVTables();
1310 // Emitting a vtable doesn't directly cause more vtables to
1311 // become deferred, although it can cause functions to be
1312 // emitted that then need those vtables.
1313 assert(DeferredVTables.empty());
1316 // Stop if we're out of both deferred vtables and deferred declarations.
1317 if (DeferredDeclsToEmit.empty())
1320 // Grab the list of decls to emit. If EmitGlobalDefinition schedules more
1321 // work, it will not interfere with this.
1322 std::vector<DeferredGlobal> CurDeclsToEmit;
1323 CurDeclsToEmit.swap(DeferredDeclsToEmit);
1325 for (DeferredGlobal &G : CurDeclsToEmit) {
1326 GlobalDecl D = G.GD;
1329 // We should call GetAddrOfGlobal with IsForDefinition set to true in order
1330 // to get GlobalValue with exactly the type we need, not something that
1331 // might had been created for another decl with the same mangled name but
1333 llvm::GlobalValue *GV = dyn_cast<llvm::GlobalValue>(
1334 GetAddrOfGlobal(D, ForDefinition));
1336 // In case of different address spaces, we may still get a cast, even with
1337 // IsForDefinition equal to true. Query mangled names table to get
1340 GV = GetGlobalValue(getMangledName(D));
1342 // Make sure GetGlobalValue returned non-null.
1345 // Check to see if we've already emitted this. This is necessary
1346 // for a couple of reasons: first, decls can end up in the
1347 // deferred-decls queue multiple times, and second, decls can end
1348 // up with definitions in unusual ways (e.g. by an extern inline
1349 // function acquiring a strong function redefinition). Just
1350 // ignore these cases.
1351 if (!GV->isDeclaration())
1354 // Otherwise, emit the definition and move on to the next one.
1355 EmitGlobalDefinition(D, GV);
1357 // If we found out that we need to emit more decls, do that recursively.
1358 // This has the advantage that the decls are emitted in a DFS and related
1359 // ones are close together, which is convenient for testing.
1360 if (!DeferredVTables.empty() || !DeferredDeclsToEmit.empty()) {
1362 assert(DeferredVTables.empty() && DeferredDeclsToEmit.empty());
1367 void CodeGenModule::EmitGlobalAnnotations() {
1368 if (Annotations.empty())
1371 // Create a new global variable for the ConstantStruct in the Module.
1372 llvm::Constant *Array = llvm::ConstantArray::get(llvm::ArrayType::get(
1373 Annotations[0]->getType(), Annotations.size()), Annotations);
1374 auto *gv = new llvm::GlobalVariable(getModule(), Array->getType(), false,
1375 llvm::GlobalValue::AppendingLinkage,
1376 Array, "llvm.global.annotations");
1377 gv->setSection(AnnotationSection);
1380 llvm::Constant *CodeGenModule::EmitAnnotationString(StringRef Str) {
1381 llvm::Constant *&AStr = AnnotationStrings[Str];
1385 // Not found yet, create a new global.
1386 llvm::Constant *s = llvm::ConstantDataArray::getString(getLLVMContext(), Str);
1388 new llvm::GlobalVariable(getModule(), s->getType(), true,
1389 llvm::GlobalValue::PrivateLinkage, s, ".str");
1390 gv->setSection(AnnotationSection);
1391 gv->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1396 llvm::Constant *CodeGenModule::EmitAnnotationUnit(SourceLocation Loc) {
1397 SourceManager &SM = getContext().getSourceManager();
1398 PresumedLoc PLoc = SM.getPresumedLoc(Loc);
1400 return EmitAnnotationString(PLoc.getFilename());
1401 return EmitAnnotationString(SM.getBufferName(Loc));
1404 llvm::Constant *CodeGenModule::EmitAnnotationLineNo(SourceLocation L) {
1405 SourceManager &SM = getContext().getSourceManager();
1406 PresumedLoc PLoc = SM.getPresumedLoc(L);
1407 unsigned LineNo = PLoc.isValid() ? PLoc.getLine() :
1408 SM.getExpansionLineNumber(L);
1409 return llvm::ConstantInt::get(Int32Ty, LineNo);
1412 llvm::Constant *CodeGenModule::EmitAnnotateAttr(llvm::GlobalValue *GV,
1413 const AnnotateAttr *AA,
1415 // Get the globals for file name, annotation, and the line number.
1416 llvm::Constant *AnnoGV = EmitAnnotationString(AA->getAnnotation()),
1417 *UnitGV = EmitAnnotationUnit(L),
1418 *LineNoCst = EmitAnnotationLineNo(L);
1420 // Create the ConstantStruct for the global annotation.
1421 llvm::Constant *Fields[4] = {
1422 llvm::ConstantExpr::getBitCast(GV, Int8PtrTy),
1423 llvm::ConstantExpr::getBitCast(AnnoGV, Int8PtrTy),
1424 llvm::ConstantExpr::getBitCast(UnitGV, Int8PtrTy),
1427 return llvm::ConstantStruct::getAnon(Fields);
1430 void CodeGenModule::AddGlobalAnnotations(const ValueDecl *D,
1431 llvm::GlobalValue *GV) {
1432 assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute");
1433 // Get the struct elements for these annotations.
1434 for (const auto *I : D->specific_attrs<AnnotateAttr>())
1435 Annotations.push_back(EmitAnnotateAttr(GV, I, D->getLocation()));
1438 bool CodeGenModule::isInSanitizerBlacklist(llvm::Function *Fn,
1439 SourceLocation Loc) const {
1440 const auto &SanitizerBL = getContext().getSanitizerBlacklist();
1441 // Blacklist by function name.
1442 if (SanitizerBL.isBlacklistedFunction(Fn->getName()))
1444 // Blacklist by location.
1446 return SanitizerBL.isBlacklistedLocation(Loc);
1447 // If location is unknown, this may be a compiler-generated function. Assume
1448 // it's located in the main file.
1449 auto &SM = Context.getSourceManager();
1450 if (const auto *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
1451 return SanitizerBL.isBlacklistedFile(MainFile->getName());
1456 bool CodeGenModule::isInSanitizerBlacklist(llvm::GlobalVariable *GV,
1457 SourceLocation Loc, QualType Ty,
1458 StringRef Category) const {
1459 // For now globals can be blacklisted only in ASan and KASan.
1460 if (!LangOpts.Sanitize.hasOneOf(
1461 SanitizerKind::Address | SanitizerKind::KernelAddress))
1463 const auto &SanitizerBL = getContext().getSanitizerBlacklist();
1464 if (SanitizerBL.isBlacklistedGlobal(GV->getName(), Category))
1466 if (SanitizerBL.isBlacklistedLocation(Loc, Category))
1468 // Check global type.
1470 // Drill down the array types: if global variable of a fixed type is
1471 // blacklisted, we also don't instrument arrays of them.
1472 while (auto AT = dyn_cast<ArrayType>(Ty.getTypePtr()))
1473 Ty = AT->getElementType();
1474 Ty = Ty.getCanonicalType().getUnqualifiedType();
1475 // We allow to blacklist only record types (classes, structs etc.)
1476 if (Ty->isRecordType()) {
1477 std::string TypeStr = Ty.getAsString(getContext().getPrintingPolicy());
1478 if (SanitizerBL.isBlacklistedType(TypeStr, Category))
1485 bool CodeGenModule::MustBeEmitted(const ValueDecl *Global) {
1486 // Never defer when EmitAllDecls is specified.
1487 if (LangOpts.EmitAllDecls)
1490 return getContext().DeclMustBeEmitted(Global);
1493 bool CodeGenModule::MayBeEmittedEagerly(const ValueDecl *Global) {
1494 if (const auto *FD = dyn_cast<FunctionDecl>(Global))
1495 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
1496 // Implicit template instantiations may change linkage if they are later
1497 // explicitly instantiated, so they should not be emitted eagerly.
1499 if (const auto *VD = dyn_cast<VarDecl>(Global))
1500 if (Context.getInlineVariableDefinitionKind(VD) ==
1501 ASTContext::InlineVariableDefinitionKind::WeakUnknown)
1502 // A definition of an inline constexpr static data member may change
1503 // linkage later if it's redeclared outside the class.
1505 // If OpenMP is enabled and threadprivates must be generated like TLS, delay
1506 // codegen for global variables, because they may be marked as threadprivate.
1507 if (LangOpts.OpenMP && LangOpts.OpenMPUseTLS &&
1508 getContext().getTargetInfo().isTLSSupported() && isa<VarDecl>(Global))
1514 ConstantAddress CodeGenModule::GetAddrOfUuidDescriptor(
1515 const CXXUuidofExpr* E) {
1516 // Sema has verified that IIDSource has a __declspec(uuid()), and that its
1518 StringRef Uuid = E->getUuidStr();
1519 std::string Name = "_GUID_" + Uuid.lower();
1520 std::replace(Name.begin(), Name.end(), '-', '_');
1522 // The UUID descriptor should be pointer aligned.
1523 CharUnits Alignment = CharUnits::fromQuantity(PointerAlignInBytes);
1525 // Look for an existing global.
1526 if (llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name))
1527 return ConstantAddress(GV, Alignment);
1529 llvm::Constant *Init = EmitUuidofInitializer(Uuid);
1530 assert(Init && "failed to initialize as constant");
1532 auto *GV = new llvm::GlobalVariable(
1533 getModule(), Init->getType(),
1534 /*isConstant=*/true, llvm::GlobalValue::LinkOnceODRLinkage, Init, Name);
1535 if (supportsCOMDAT())
1536 GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
1537 return ConstantAddress(GV, Alignment);
1540 ConstantAddress CodeGenModule::GetWeakRefReference(const ValueDecl *VD) {
1541 const AliasAttr *AA = VD->getAttr<AliasAttr>();
1542 assert(AA && "No alias?");
1544 CharUnits Alignment = getContext().getDeclAlign(VD);
1545 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(VD->getType());
1547 // See if there is already something with the target's name in the module.
1548 llvm::GlobalValue *Entry = GetGlobalValue(AA->getAliasee());
1550 unsigned AS = getContext().getTargetAddressSpace(VD->getType());
1551 auto Ptr = llvm::ConstantExpr::getBitCast(Entry, DeclTy->getPointerTo(AS));
1552 return ConstantAddress(Ptr, Alignment);
1555 llvm::Constant *Aliasee;
1556 if (isa<llvm::FunctionType>(DeclTy))
1557 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy,
1558 GlobalDecl(cast<FunctionDecl>(VD)),
1559 /*ForVTable=*/false);
1561 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
1562 llvm::PointerType::getUnqual(DeclTy),
1565 auto *F = cast<llvm::GlobalValue>(Aliasee);
1566 F->setLinkage(llvm::Function::ExternalWeakLinkage);
1567 WeakRefReferences.insert(F);
1569 return ConstantAddress(Aliasee, Alignment);
1572 void CodeGenModule::EmitGlobal(GlobalDecl GD) {
1573 const auto *Global = cast<ValueDecl>(GD.getDecl());
1575 // Weak references don't produce any output by themselves.
1576 if (Global->hasAttr<WeakRefAttr>())
1579 // If this is an alias definition (which otherwise looks like a declaration)
1581 if (Global->hasAttr<AliasAttr>())
1582 return EmitAliasDefinition(GD);
1584 // IFunc like an alias whose value is resolved at runtime by calling resolver.
1585 if (Global->hasAttr<IFuncAttr>())
1586 return emitIFuncDefinition(GD);
1588 // If this is CUDA, be selective about which declarations we emit.
1589 if (LangOpts.CUDA) {
1590 if (LangOpts.CUDAIsDevice) {
1591 if (!Global->hasAttr<CUDADeviceAttr>() &&
1592 !Global->hasAttr<CUDAGlobalAttr>() &&
1593 !Global->hasAttr<CUDAConstantAttr>() &&
1594 !Global->hasAttr<CUDASharedAttr>())
1597 // We need to emit host-side 'shadows' for all global
1598 // device-side variables because the CUDA runtime needs their
1599 // size and host-side address in order to provide access to
1600 // their device-side incarnations.
1602 // So device-only functions are the only things we skip.
1603 if (isa<FunctionDecl>(Global) && !Global->hasAttr<CUDAHostAttr>() &&
1604 Global->hasAttr<CUDADeviceAttr>())
1607 assert((isa<FunctionDecl>(Global) || isa<VarDecl>(Global)) &&
1608 "Expected Variable or Function");
1612 if (LangOpts.OpenMP) {
1613 // If this is OpenMP device, check if it is legal to emit this global
1615 if (OpenMPRuntime && OpenMPRuntime->emitTargetGlobal(GD))
1617 if (auto *DRD = dyn_cast<OMPDeclareReductionDecl>(Global)) {
1618 if (MustBeEmitted(Global))
1619 EmitOMPDeclareReduction(DRD);
1624 // Ignore declarations, they will be emitted on their first use.
1625 if (const auto *FD = dyn_cast<FunctionDecl>(Global)) {
1626 // Forward declarations are emitted lazily on first use.
1627 if (!FD->doesThisDeclarationHaveABody()) {
1628 if (!FD->doesDeclarationForceExternallyVisibleDefinition())
1631 StringRef MangledName = getMangledName(GD);
1633 // Compute the function info and LLVM type.
1634 const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
1635 llvm::Type *Ty = getTypes().GetFunctionType(FI);
1637 GetOrCreateLLVMFunction(MangledName, Ty, GD, /*ForVTable=*/false,
1638 /*DontDefer=*/false);
1642 const auto *VD = cast<VarDecl>(Global);
1643 assert(VD->isFileVarDecl() && "Cannot emit local var decl as global.");
1644 // We need to emit device-side global CUDA variables even if a
1645 // variable does not have a definition -- we still need to define
1646 // host-side shadow for it.
1647 bool MustEmitForCuda = LangOpts.CUDA && !LangOpts.CUDAIsDevice &&
1648 !VD->hasDefinition() &&
1649 (VD->hasAttr<CUDAConstantAttr>() ||
1650 VD->hasAttr<CUDADeviceAttr>());
1651 if (!MustEmitForCuda &&
1652 VD->isThisDeclarationADefinition() != VarDecl::Definition &&
1653 !Context.isMSStaticDataMemberInlineDefinition(VD)) {
1654 // If this declaration may have caused an inline variable definition to
1655 // change linkage, make sure that it's emitted.
1656 if (Context.getInlineVariableDefinitionKind(VD) ==
1657 ASTContext::InlineVariableDefinitionKind::Strong)
1658 GetAddrOfGlobalVar(VD);
1663 // Defer code generation to first use when possible, e.g. if this is an inline
1664 // function. If the global must always be emitted, do it eagerly if possible
1665 // to benefit from cache locality.
1666 if (MustBeEmitted(Global) && MayBeEmittedEagerly(Global)) {
1667 // Emit the definition if it can't be deferred.
1668 EmitGlobalDefinition(GD);
1672 // If we're deferring emission of a C++ variable with an
1673 // initializer, remember the order in which it appeared in the file.
1674 if (getLangOpts().CPlusPlus && isa<VarDecl>(Global) &&
1675 cast<VarDecl>(Global)->hasInit()) {
1676 DelayedCXXInitPosition[Global] = CXXGlobalInits.size();
1677 CXXGlobalInits.push_back(nullptr);
1680 StringRef MangledName = getMangledName(GD);
1681 if (llvm::GlobalValue *GV = GetGlobalValue(MangledName)) {
1682 // The value has already been used and should therefore be emitted.
1683 addDeferredDeclToEmit(GV, GD);
1684 } else if (MustBeEmitted(Global)) {
1685 // The value must be emitted, but cannot be emitted eagerly.
1686 assert(!MayBeEmittedEagerly(Global));
1687 addDeferredDeclToEmit(/*GV=*/nullptr, GD);
1689 // Otherwise, remember that we saw a deferred decl with this name. The
1690 // first use of the mangled name will cause it to move into
1691 // DeferredDeclsToEmit.
1692 DeferredDecls[MangledName] = GD;
1697 struct FunctionIsDirectlyRecursive :
1698 public RecursiveASTVisitor<FunctionIsDirectlyRecursive> {
1699 const StringRef Name;
1700 const Builtin::Context &BI;
1702 FunctionIsDirectlyRecursive(StringRef N, const Builtin::Context &C) :
1703 Name(N), BI(C), Result(false) {
1705 typedef RecursiveASTVisitor<FunctionIsDirectlyRecursive> Base;
1707 bool TraverseCallExpr(CallExpr *E) {
1708 const FunctionDecl *FD = E->getDirectCallee();
1711 AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
1712 if (Attr && Name == Attr->getLabel()) {
1716 unsigned BuiltinID = FD->getBuiltinID();
1717 if (!BuiltinID || !BI.isLibFunction(BuiltinID))
1719 StringRef BuiltinName = BI.getName(BuiltinID);
1720 if (BuiltinName.startswith("__builtin_") &&
1721 Name == BuiltinName.slice(strlen("__builtin_"), StringRef::npos)) {
1729 struct DLLImportFunctionVisitor
1730 : public RecursiveASTVisitor<DLLImportFunctionVisitor> {
1731 bool SafeToInline = true;
1733 bool shouldVisitImplicitCode() const { return true; }
1735 bool VisitVarDecl(VarDecl *VD) {
1736 // A thread-local variable cannot be imported.
1737 SafeToInline = !VD->getTLSKind();
1738 return SafeToInline;
1741 // Make sure we're not referencing non-imported vars or functions.
1742 bool VisitDeclRefExpr(DeclRefExpr *E) {
1743 ValueDecl *VD = E->getDecl();
1744 if (isa<FunctionDecl>(VD))
1745 SafeToInline = VD->hasAttr<DLLImportAttr>();
1746 else if (VarDecl *V = dyn_cast<VarDecl>(VD))
1747 SafeToInline = !V->hasGlobalStorage() || V->hasAttr<DLLImportAttr>();
1748 return SafeToInline;
1750 bool VisitCXXConstructExpr(CXXConstructExpr *E) {
1751 SafeToInline = E->getConstructor()->hasAttr<DLLImportAttr>();
1752 return SafeToInline;
1754 bool VisitCXXDeleteExpr(CXXDeleteExpr *E) {
1755 SafeToInline = E->getOperatorDelete()->hasAttr<DLLImportAttr>();
1756 return SafeToInline;
1758 bool VisitCXXNewExpr(CXXNewExpr *E) {
1759 SafeToInline = E->getOperatorNew()->hasAttr<DLLImportAttr>();
1760 return SafeToInline;
1765 // isTriviallyRecursive - Check if this function calls another
1766 // decl that, because of the asm attribute or the other decl being a builtin,
1767 // ends up pointing to itself.
1769 CodeGenModule::isTriviallyRecursive(const FunctionDecl *FD) {
1771 if (getCXXABI().getMangleContext().shouldMangleDeclName(FD)) {
1772 // asm labels are a special kind of mangling we have to support.
1773 AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
1776 Name = Attr->getLabel();
1778 Name = FD->getName();
1781 FunctionIsDirectlyRecursive Walker(Name, Context.BuiltinInfo);
1782 Walker.TraverseFunctionDecl(const_cast<FunctionDecl*>(FD));
1783 return Walker.Result;
1786 // Check if T is a class type with a destructor that's not dllimport.
1787 static bool HasNonDllImportDtor(QualType T) {
1788 if (const RecordType *RT = dyn_cast<RecordType>(T))
1789 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()))
1790 if (RD->getDestructor() && !RD->getDestructor()->hasAttr<DLLImportAttr>())
1796 bool CodeGenModule::shouldEmitFunction(GlobalDecl GD) {
1797 if (getFunctionLinkage(GD) != llvm::Function::AvailableExternallyLinkage)
1799 const auto *F = cast<FunctionDecl>(GD.getDecl());
1800 if (CodeGenOpts.OptimizationLevel == 0 && !F->hasAttr<AlwaysInlineAttr>())
1803 if (F->hasAttr<DLLImportAttr>()) {
1804 // Check whether it would be safe to inline this dllimport function.
1805 DLLImportFunctionVisitor Visitor;
1806 Visitor.TraverseFunctionDecl(const_cast<FunctionDecl*>(F));
1807 if (!Visitor.SafeToInline)
1810 if (const CXXDestructorDecl *Dtor = dyn_cast<CXXDestructorDecl>(F)) {
1811 // Implicit destructor invocations aren't captured in the AST, so the
1812 // check above can't see them. Check for them manually here.
1813 for (const Decl *Member : Dtor->getParent()->decls())
1814 if (isa<FieldDecl>(Member))
1815 if (HasNonDllImportDtor(cast<FieldDecl>(Member)->getType()))
1817 for (const CXXBaseSpecifier &B : Dtor->getParent()->bases())
1818 if (HasNonDllImportDtor(B.getType()))
1823 // PR9614. Avoid cases where the source code is lying to us. An available
1824 // externally function should have an equivalent function somewhere else,
1825 // but a function that calls itself is clearly not equivalent to the real
1827 // This happens in glibc's btowc and in some configure checks.
1828 return !isTriviallyRecursive(F);
1831 /// If the type for the method's class was generated by
1832 /// CGDebugInfo::createContextChain(), the cache contains only a
1833 /// limited DIType without any declarations. Since EmitFunctionStart()
1834 /// needs to find the canonical declaration for each method, we need
1835 /// to construct the complete type prior to emitting the method.
1836 void CodeGenModule::CompleteDIClassType(const CXXMethodDecl* D) {
1837 if (!D->isInstance())
1840 if (CGDebugInfo *DI = getModuleDebugInfo())
1841 if (getCodeGenOpts().getDebugInfo() >= codegenoptions::LimitedDebugInfo) {
1842 const auto *ThisPtr = cast<PointerType>(D->getThisType(getContext()));
1843 DI->getOrCreateRecordType(ThisPtr->getPointeeType(), D->getLocation());
1847 void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD, llvm::GlobalValue *GV) {
1848 const auto *D = cast<ValueDecl>(GD.getDecl());
1850 PrettyStackTraceDecl CrashInfo(const_cast<ValueDecl *>(D), D->getLocation(),
1851 Context.getSourceManager(),
1852 "Generating code for declaration");
1854 if (isa<FunctionDecl>(D)) {
1855 // At -O0, don't generate IR for functions with available_externally
1857 if (!shouldEmitFunction(GD))
1860 if (const auto *Method = dyn_cast<CXXMethodDecl>(D)) {
1861 CompleteDIClassType(Method);
1862 // Make sure to emit the definition(s) before we emit the thunks.
1863 // This is necessary for the generation of certain thunks.
1864 if (const auto *CD = dyn_cast<CXXConstructorDecl>(Method))
1865 ABI->emitCXXStructor(CD, getFromCtorType(GD.getCtorType()));
1866 else if (const auto *DD = dyn_cast<CXXDestructorDecl>(Method))
1867 ABI->emitCXXStructor(DD, getFromDtorType(GD.getDtorType()));
1869 EmitGlobalFunctionDefinition(GD, GV);
1871 if (Method->isVirtual())
1872 getVTables().EmitThunks(GD);
1877 return EmitGlobalFunctionDefinition(GD, GV);
1880 if (const auto *VD = dyn_cast<VarDecl>(D))
1881 return EmitGlobalVarDefinition(VD, !VD->hasDefinition());
1883 llvm_unreachable("Invalid argument to EmitGlobalDefinition()");
1886 static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old,
1887 llvm::Function *NewFn);
1889 /// GetOrCreateLLVMFunction - If the specified mangled name is not in the
1890 /// module, create and return an llvm Function with the specified type. If there
1891 /// is something in the module with the specified name, return it potentially
1892 /// bitcasted to the right type.
1894 /// If D is non-null, it specifies a decl that correspond to this. This is used
1895 /// to set the attributes on the function when it is first created.
1897 CodeGenModule::GetOrCreateLLVMFunction(StringRef MangledName,
1899 GlobalDecl GD, bool ForVTable,
1900 bool DontDefer, bool IsThunk,
1901 llvm::AttributeSet ExtraAttrs,
1902 ForDefinition_t IsForDefinition) {
1903 const Decl *D = GD.getDecl();
1905 // Lookup the entry, lazily creating it if necessary.
1906 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
1908 if (WeakRefReferences.erase(Entry)) {
1909 const FunctionDecl *FD = cast_or_null<FunctionDecl>(D);
1910 if (FD && !FD->hasAttr<WeakAttr>())
1911 Entry->setLinkage(llvm::Function::ExternalLinkage);
1914 // Handle dropped DLL attributes.
1915 if (D && !D->hasAttr<DLLImportAttr>() && !D->hasAttr<DLLExportAttr>())
1916 Entry->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
1918 // If there are two attempts to define the same mangled name, issue an
1920 if (IsForDefinition && !Entry->isDeclaration()) {
1922 // Check that GD is not yet in DiagnosedConflictingDefinitions is required
1923 // to make sure that we issue an error only once.
1924 if (lookupRepresentativeDecl(MangledName, OtherGD) &&
1925 (GD.getCanonicalDecl().getDecl() !=
1926 OtherGD.getCanonicalDecl().getDecl()) &&
1927 DiagnosedConflictingDefinitions.insert(GD).second) {
1928 getDiags().Report(D->getLocation(),
1929 diag::err_duplicate_mangled_name);
1930 getDiags().Report(OtherGD.getDecl()->getLocation(),
1931 diag::note_previous_definition);
1935 if ((isa<llvm::Function>(Entry) || isa<llvm::GlobalAlias>(Entry)) &&
1936 (Entry->getType()->getElementType() == Ty)) {
1940 // Make sure the result is of the correct type.
1941 // (If function is requested for a definition, we always need to create a new
1942 // function, not just return a bitcast.)
1943 if (!IsForDefinition)
1944 return llvm::ConstantExpr::getBitCast(Entry, Ty->getPointerTo());
1947 // This function doesn't have a complete type (for example, the return
1948 // type is an incomplete struct). Use a fake type instead, and make
1949 // sure not to try to set attributes.
1950 bool IsIncompleteFunction = false;
1952 llvm::FunctionType *FTy;
1953 if (isa<llvm::FunctionType>(Ty)) {
1954 FTy = cast<llvm::FunctionType>(Ty);
1956 FTy = llvm::FunctionType::get(VoidTy, false);
1957 IsIncompleteFunction = true;
1961 llvm::Function::Create(FTy, llvm::Function::ExternalLinkage,
1962 Entry ? StringRef() : MangledName, &getModule());
1964 // If we already created a function with the same mangled name (but different
1965 // type) before, take its name and add it to the list of functions to be
1966 // replaced with F at the end of CodeGen.
1968 // This happens if there is a prototype for a function (e.g. "int f()") and
1969 // then a definition of a different type (e.g. "int f(int x)").
1973 // This might be an implementation of a function without a prototype, in
1974 // which case, try to do special replacement of calls which match the new
1975 // prototype. The really key thing here is that we also potentially drop
1976 // arguments from the call site so as to make a direct call, which makes the
1977 // inliner happier and suppresses a number of optimizer warnings (!) about
1978 // dropping arguments.
1979 if (!Entry->use_empty()) {
1980 ReplaceUsesOfNonProtoTypeWithRealFunction(Entry, F);
1981 Entry->removeDeadConstantUsers();
1984 llvm::Constant *BC = llvm::ConstantExpr::getBitCast(
1985 F, Entry->getType()->getElementType()->getPointerTo());
1986 addGlobalValReplacement(Entry, BC);
1989 assert(F->getName() == MangledName && "name was uniqued!");
1991 SetFunctionAttributes(GD, F, IsIncompleteFunction, IsThunk);
1992 if (ExtraAttrs.hasAttributes(llvm::AttributeSet::FunctionIndex)) {
1993 llvm::AttrBuilder B(ExtraAttrs, llvm::AttributeSet::FunctionIndex);
1994 F->addAttributes(llvm::AttributeSet::FunctionIndex,
1995 llvm::AttributeSet::get(VMContext,
1996 llvm::AttributeSet::FunctionIndex,
2001 // All MSVC dtors other than the base dtor are linkonce_odr and delegate to
2002 // each other bottoming out with the base dtor. Therefore we emit non-base
2003 // dtors on usage, even if there is no dtor definition in the TU.
2004 if (D && isa<CXXDestructorDecl>(D) &&
2005 getCXXABI().useThunkForDtorVariant(cast<CXXDestructorDecl>(D),
2007 addDeferredDeclToEmit(F, GD);
2009 // This is the first use or definition of a mangled name. If there is a
2010 // deferred decl with this name, remember that we need to emit it at the end
2012 auto DDI = DeferredDecls.find(MangledName);
2013 if (DDI != DeferredDecls.end()) {
2014 // Move the potentially referenced deferred decl to the
2015 // DeferredDeclsToEmit list, and remove it from DeferredDecls (since we
2016 // don't need it anymore).
2017 addDeferredDeclToEmit(F, DDI->second);
2018 DeferredDecls.erase(DDI);
2020 // Otherwise, there are cases we have to worry about where we're
2021 // using a declaration for which we must emit a definition but where
2022 // we might not find a top-level definition:
2023 // - member functions defined inline in their classes
2024 // - friend functions defined inline in some class
2025 // - special member functions with implicit definitions
2026 // If we ever change our AST traversal to walk into class methods,
2027 // this will be unnecessary.
2029 // We also don't emit a definition for a function if it's going to be an
2030 // entry in a vtable, unless it's already marked as used.
2031 } else if (getLangOpts().CPlusPlus && D) {
2032 // Look for a declaration that's lexically in a record.
2033 for (const auto *FD = cast<FunctionDecl>(D)->getMostRecentDecl(); FD;
2034 FD = FD->getPreviousDecl()) {
2035 if (isa<CXXRecordDecl>(FD->getLexicalDeclContext())) {
2036 if (FD->doesThisDeclarationHaveABody()) {
2037 addDeferredDeclToEmit(F, GD.getWithDecl(FD));
2045 // Make sure the result is of the requested type.
2046 if (!IsIncompleteFunction) {
2047 assert(F->getType()->getElementType() == Ty);
2051 llvm::Type *PTy = llvm::PointerType::getUnqual(Ty);
2052 return llvm::ConstantExpr::getBitCast(F, PTy);
2055 /// GetAddrOfFunction - Return the address of the given function. If Ty is
2056 /// non-null, then this function will use the specified type if it has to
2057 /// create it (this occurs when we see a definition of the function).
2058 llvm::Constant *CodeGenModule::GetAddrOfFunction(GlobalDecl GD,
2062 ForDefinition_t IsForDefinition) {
2063 // If there was no specific requested type, just convert it now.
2065 const auto *FD = cast<FunctionDecl>(GD.getDecl());
2066 auto CanonTy = Context.getCanonicalType(FD->getType());
2067 Ty = getTypes().ConvertFunctionType(CanonTy, FD);
2070 StringRef MangledName = getMangledName(GD);
2071 return GetOrCreateLLVMFunction(MangledName, Ty, GD, ForVTable, DontDefer,
2072 /*IsThunk=*/false, llvm::AttributeSet(),
2076 static const FunctionDecl *
2077 GetRuntimeFunctionDecl(ASTContext &C, StringRef Name) {
2078 TranslationUnitDecl *TUDecl = C.getTranslationUnitDecl();
2079 DeclContext *DC = TranslationUnitDecl::castToDeclContext(TUDecl);
2081 IdentifierInfo &CII = C.Idents.get(Name);
2082 for (const auto &Result : DC->lookup(&CII))
2083 if (const auto FD = dyn_cast<FunctionDecl>(Result))
2086 if (!C.getLangOpts().CPlusPlus)
2089 // Demangle the premangled name from getTerminateFn()
2090 IdentifierInfo &CXXII =
2091 (Name == "_ZSt9terminatev" || Name == "\01?terminate@@YAXXZ")
2092 ? C.Idents.get("terminate")
2093 : C.Idents.get(Name);
2095 for (const auto &N : {"__cxxabiv1", "std"}) {
2096 IdentifierInfo &NS = C.Idents.get(N);
2097 for (const auto &Result : DC->lookup(&NS)) {
2098 NamespaceDecl *ND = dyn_cast<NamespaceDecl>(Result);
2099 if (auto LSD = dyn_cast<LinkageSpecDecl>(Result))
2100 for (const auto &Result : LSD->lookup(&NS))
2101 if ((ND = dyn_cast<NamespaceDecl>(Result)))
2105 for (const auto &Result : ND->lookup(&CXXII))
2106 if (const auto *FD = dyn_cast<FunctionDecl>(Result))
2114 /// CreateRuntimeFunction - Create a new runtime function with the specified
2117 CodeGenModule::CreateRuntimeFunction(llvm::FunctionType *FTy, StringRef Name,
2118 llvm::AttributeSet ExtraAttrs,
2121 GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(), /*ForVTable=*/false,
2122 /*DontDefer=*/false, /*IsThunk=*/false,
2125 if (auto *F = dyn_cast<llvm::Function>(C)) {
2127 F->setCallingConv(getRuntimeCC());
2129 if (!Local && getTriple().isOSBinFormatCOFF() &&
2130 !getCodeGenOpts().LTOVisibilityPublicStd) {
2131 const FunctionDecl *FD = GetRuntimeFunctionDecl(Context, Name);
2132 if (!FD || FD->hasAttr<DLLImportAttr>()) {
2133 F->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
2134 F->setLinkage(llvm::GlobalValue::ExternalLinkage);
2143 /// CreateBuiltinFunction - Create a new builtin function with the specified
2146 CodeGenModule::CreateBuiltinFunction(llvm::FunctionType *FTy,
2148 llvm::AttributeSet ExtraAttrs) {
2150 GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(), /*ForVTable=*/false,
2151 /*DontDefer=*/false, /*IsThunk=*/false, ExtraAttrs);
2152 if (auto *F = dyn_cast<llvm::Function>(C))
2154 F->setCallingConv(getBuiltinCC());
2158 /// isTypeConstant - Determine whether an object of this type can be emitted
2161 /// If ExcludeCtor is true, the duration when the object's constructor runs
2162 /// will not be considered. The caller will need to verify that the object is
2163 /// not written to during its construction.
2164 bool CodeGenModule::isTypeConstant(QualType Ty, bool ExcludeCtor) {
2165 if (!Ty.isConstant(Context) && !Ty->isReferenceType())
2168 if (Context.getLangOpts().CPlusPlus) {
2169 if (const CXXRecordDecl *Record
2170 = Context.getBaseElementType(Ty)->getAsCXXRecordDecl())
2171 return ExcludeCtor && !Record->hasMutableFields() &&
2172 Record->hasTrivialDestructor();
2178 /// GetOrCreateLLVMGlobal - If the specified mangled name is not in the module,
2179 /// create and return an llvm GlobalVariable with the specified type. If there
2180 /// is something in the module with the specified name, return it potentially
2181 /// bitcasted to the right type.
2183 /// If D is non-null, it specifies a decl that correspond to this. This is used
2184 /// to set the attributes on the global when it is first created.
2186 /// If IsForDefinition is true, it is guranteed that an actual global with
2187 /// type Ty will be returned, not conversion of a variable with the same
2188 /// mangled name but some other type.
2190 CodeGenModule::GetOrCreateLLVMGlobal(StringRef MangledName,
2191 llvm::PointerType *Ty,
2193 ForDefinition_t IsForDefinition) {
2194 // Lookup the entry, lazily creating it if necessary.
2195 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
2197 if (WeakRefReferences.erase(Entry)) {
2198 if (D && !D->hasAttr<WeakAttr>())
2199 Entry->setLinkage(llvm::Function::ExternalLinkage);
2202 // Handle dropped DLL attributes.
2203 if (D && !D->hasAttr<DLLImportAttr>() && !D->hasAttr<DLLExportAttr>())
2204 Entry->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
2206 if (Entry->getType() == Ty)
2209 // If there are two attempts to define the same mangled name, issue an
2211 if (IsForDefinition && !Entry->isDeclaration()) {
2213 const VarDecl *OtherD;
2215 // Check that D is not yet in DiagnosedConflictingDefinitions is required
2216 // to make sure that we issue an error only once.
2217 if (D && lookupRepresentativeDecl(MangledName, OtherGD) &&
2218 (D->getCanonicalDecl() != OtherGD.getCanonicalDecl().getDecl()) &&
2219 (OtherD = dyn_cast<VarDecl>(OtherGD.getDecl())) &&
2220 OtherD->hasInit() &&
2221 DiagnosedConflictingDefinitions.insert(D).second) {
2222 getDiags().Report(D->getLocation(),
2223 diag::err_duplicate_mangled_name);
2224 getDiags().Report(OtherGD.getDecl()->getLocation(),
2225 diag::note_previous_definition);
2229 // Make sure the result is of the correct type.
2230 if (Entry->getType()->getAddressSpace() != Ty->getAddressSpace())
2231 return llvm::ConstantExpr::getAddrSpaceCast(Entry, Ty);
2233 // (If global is requested for a definition, we always need to create a new
2234 // global, not just return a bitcast.)
2235 if (!IsForDefinition)
2236 return llvm::ConstantExpr::getBitCast(Entry, Ty);
2239 unsigned AddrSpace = GetGlobalVarAddressSpace(D, Ty->getAddressSpace());
2240 auto *GV = new llvm::GlobalVariable(
2241 getModule(), Ty->getElementType(), false,
2242 llvm::GlobalValue::ExternalLinkage, nullptr, MangledName, nullptr,
2243 llvm::GlobalVariable::NotThreadLocal, AddrSpace);
2245 // If we already created a global with the same mangled name (but different
2246 // type) before, take its name and remove it from its parent.
2248 GV->takeName(Entry);
2250 if (!Entry->use_empty()) {
2251 llvm::Constant *NewPtrForOldDecl =
2252 llvm::ConstantExpr::getBitCast(GV, Entry->getType());
2253 Entry->replaceAllUsesWith(NewPtrForOldDecl);
2256 Entry->eraseFromParent();
2259 // This is the first use or definition of a mangled name. If there is a
2260 // deferred decl with this name, remember that we need to emit it at the end
2262 auto DDI = DeferredDecls.find(MangledName);
2263 if (DDI != DeferredDecls.end()) {
2264 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit
2265 // list, and remove it from DeferredDecls (since we don't need it anymore).
2266 addDeferredDeclToEmit(GV, DDI->second);
2267 DeferredDecls.erase(DDI);
2270 // Handle things which are present even on external declarations.
2272 // FIXME: This code is overly simple and should be merged with other global
2274 GV->setConstant(isTypeConstant(D->getType(), false));
2276 GV->setAlignment(getContext().getDeclAlign(D).getQuantity());
2278 setLinkageAndVisibilityForGV(GV, D);
2280 if (D->getTLSKind()) {
2281 if (D->getTLSKind() == VarDecl::TLS_Dynamic)
2282 CXXThreadLocals.push_back(D);
2286 // If required by the ABI, treat declarations of static data members with
2287 // inline initializers as definitions.
2288 if (getContext().isMSStaticDataMemberInlineDefinition(D)) {
2289 EmitGlobalVarDefinition(D);
2292 // Handle XCore specific ABI requirements.
2293 if (getTriple().getArch() == llvm::Triple::xcore &&
2294 D->getLanguageLinkage() == CLanguageLinkage &&
2295 D->getType().isConstant(Context) &&
2296 isExternallyVisible(D->getLinkageAndVisibility().getLinkage()))
2297 GV->setSection(".cp.rodata");
2300 if (AddrSpace != Ty->getAddressSpace())
2301 return llvm::ConstantExpr::getAddrSpaceCast(GV, Ty);
2307 CodeGenModule::GetAddrOfGlobal(GlobalDecl GD,
2308 ForDefinition_t IsForDefinition) {
2309 const Decl *D = GD.getDecl();
2310 if (isa<CXXConstructorDecl>(D))
2311 return getAddrOfCXXStructor(cast<CXXConstructorDecl>(D),
2312 getFromCtorType(GD.getCtorType()),
2313 /*FnInfo=*/nullptr, /*FnType=*/nullptr,
2314 /*DontDefer=*/false, IsForDefinition);
2315 else if (isa<CXXDestructorDecl>(D))
2316 return getAddrOfCXXStructor(cast<CXXDestructorDecl>(D),
2317 getFromDtorType(GD.getDtorType()),
2318 /*FnInfo=*/nullptr, /*FnType=*/nullptr,
2319 /*DontDefer=*/false, IsForDefinition);
2320 else if (isa<CXXMethodDecl>(D)) {
2321 auto FInfo = &getTypes().arrangeCXXMethodDeclaration(
2322 cast<CXXMethodDecl>(D));
2323 auto Ty = getTypes().GetFunctionType(*FInfo);
2324 return GetAddrOfFunction(GD, Ty, /*ForVTable=*/false, /*DontDefer=*/false,
2326 } else if (isa<FunctionDecl>(D)) {
2327 const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
2328 llvm::FunctionType *Ty = getTypes().GetFunctionType(FI);
2329 return GetAddrOfFunction(GD, Ty, /*ForVTable=*/false, /*DontDefer=*/false,
2332 return GetAddrOfGlobalVar(cast<VarDecl>(D), /*Ty=*/nullptr,
2336 llvm::GlobalVariable *
2337 CodeGenModule::CreateOrReplaceCXXRuntimeVariable(StringRef Name,
2339 llvm::GlobalValue::LinkageTypes Linkage) {
2340 llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name);
2341 llvm::GlobalVariable *OldGV = nullptr;
2344 // Check if the variable has the right type.
2345 if (GV->getType()->getElementType() == Ty)
2348 // Because C++ name mangling, the only way we can end up with an already
2349 // existing global with the same name is if it has been declared extern "C".
2350 assert(GV->isDeclaration() && "Declaration has wrong type!");
2354 // Create a new variable.
2355 GV = new llvm::GlobalVariable(getModule(), Ty, /*isConstant=*/true,
2356 Linkage, nullptr, Name);
2359 // Replace occurrences of the old variable if needed.
2360 GV->takeName(OldGV);
2362 if (!OldGV->use_empty()) {
2363 llvm::Constant *NewPtrForOldDecl =
2364 llvm::ConstantExpr::getBitCast(GV, OldGV->getType());
2365 OldGV->replaceAllUsesWith(NewPtrForOldDecl);
2368 OldGV->eraseFromParent();
2371 if (supportsCOMDAT() && GV->isWeakForLinker() &&
2372 !GV->hasAvailableExternallyLinkage())
2373 GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
2378 /// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the
2379 /// given global variable. If Ty is non-null and if the global doesn't exist,
2380 /// then it will be created with the specified type instead of whatever the
2381 /// normal requested type would be. If IsForDefinition is true, it is guranteed
2382 /// that an actual global with type Ty will be returned, not conversion of a
2383 /// variable with the same mangled name but some other type.
2384 llvm::Constant *CodeGenModule::GetAddrOfGlobalVar(const VarDecl *D,
2386 ForDefinition_t IsForDefinition) {
2387 assert(D->hasGlobalStorage() && "Not a global variable");
2388 QualType ASTTy = D->getType();
2390 Ty = getTypes().ConvertTypeForMem(ASTTy);
2392 llvm::PointerType *PTy =
2393 llvm::PointerType::get(Ty, getContext().getTargetAddressSpace(ASTTy));
2395 StringRef MangledName = getMangledName(D);
2396 return GetOrCreateLLVMGlobal(MangledName, PTy, D, IsForDefinition);
2399 /// CreateRuntimeVariable - Create a new runtime global variable with the
2400 /// specified type and name.
2402 CodeGenModule::CreateRuntimeVariable(llvm::Type *Ty,
2404 return GetOrCreateLLVMGlobal(Name, llvm::PointerType::getUnqual(Ty), nullptr);
2407 void CodeGenModule::EmitTentativeDefinition(const VarDecl *D) {
2408 assert(!D->getInit() && "Cannot emit definite definitions here!");
2410 StringRef MangledName = getMangledName(D);
2411 llvm::GlobalValue *GV = GetGlobalValue(MangledName);
2413 // We already have a definition, not declaration, with the same mangled name.
2414 // Emitting of declaration is not required (and actually overwrites emitted
2416 if (GV && !GV->isDeclaration())
2419 // If we have not seen a reference to this variable yet, place it into the
2420 // deferred declarations table to be emitted if needed later.
2421 if (!MustBeEmitted(D) && !GV) {
2422 DeferredDecls[MangledName] = D;
2426 // The tentative definition is the only definition.
2427 EmitGlobalVarDefinition(D);
2430 CharUnits CodeGenModule::GetTargetTypeStoreSize(llvm::Type *Ty) const {
2431 return Context.toCharUnitsFromBits(
2432 getDataLayout().getTypeStoreSizeInBits(Ty));
2435 unsigned CodeGenModule::GetGlobalVarAddressSpace(const VarDecl *D,
2436 unsigned AddrSpace) {
2437 if (D && LangOpts.CUDA && LangOpts.CUDAIsDevice) {
2438 if (D->hasAttr<CUDAConstantAttr>())
2439 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_constant);
2440 else if (D->hasAttr<CUDASharedAttr>())
2441 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_shared);
2443 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_device);
2449 template<typename SomeDecl>
2450 void CodeGenModule::MaybeHandleStaticInExternC(const SomeDecl *D,
2451 llvm::GlobalValue *GV) {
2452 if (!getLangOpts().CPlusPlus)
2455 // Must have 'used' attribute, or else inline assembly can't rely on
2456 // the name existing.
2457 if (!D->template hasAttr<UsedAttr>())
2460 // Must have internal linkage and an ordinary name.
2461 if (!D->getIdentifier() || D->getFormalLinkage() != InternalLinkage)
2464 // Must be in an extern "C" context. Entities declared directly within
2465 // a record are not extern "C" even if the record is in such a context.
2466 const SomeDecl *First = D->getFirstDecl();
2467 if (First->getDeclContext()->isRecord() || !First->isInExternCContext())
2470 // OK, this is an internal linkage entity inside an extern "C" linkage
2471 // specification. Make a note of that so we can give it the "expected"
2472 // mangled name if nothing else is using that name.
2473 std::pair<StaticExternCMap::iterator, bool> R =
2474 StaticExternCValues.insert(std::make_pair(D->getIdentifier(), GV));
2476 // If we have multiple internal linkage entities with the same name
2477 // in extern "C" regions, none of them gets that name.
2479 R.first->second = nullptr;
2482 static bool shouldBeInCOMDAT(CodeGenModule &CGM, const Decl &D) {
2483 if (!CGM.supportsCOMDAT())
2486 if (D.hasAttr<SelectAnyAttr>())
2490 if (auto *VD = dyn_cast<VarDecl>(&D))
2491 Linkage = CGM.getContext().GetGVALinkageForVariable(VD);
2493 Linkage = CGM.getContext().GetGVALinkageForFunction(cast<FunctionDecl>(&D));
2497 case GVA_AvailableExternally:
2498 case GVA_StrongExternal:
2500 case GVA_DiscardableODR:
2504 llvm_unreachable("No such linkage");
2507 void CodeGenModule::maybeSetTrivialComdat(const Decl &D,
2508 llvm::GlobalObject &GO) {
2509 if (!shouldBeInCOMDAT(*this, D))
2511 GO.setComdat(TheModule.getOrInsertComdat(GO.getName()));
2514 /// Pass IsTentative as true if you want to create a tentative definition.
2515 void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D,
2517 // OpenCL global variables of sampler type are translated to function calls,
2518 // therefore no need to be translated.
2519 QualType ASTTy = D->getType();
2520 if (getLangOpts().OpenCL && ASTTy->isSamplerT())
2523 llvm::Constant *Init = nullptr;
2524 CXXRecordDecl *RD = ASTTy->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
2525 bool NeedsGlobalCtor = false;
2526 bool NeedsGlobalDtor = RD && !RD->hasTrivialDestructor();
2528 const VarDecl *InitDecl;
2529 const Expr *InitExpr = D->getAnyInitializer(InitDecl);
2531 // CUDA E.2.4.1 "__shared__ variables cannot have an initialization
2532 // as part of their declaration." Sema has already checked for
2533 // error cases, so we just need to set Init to UndefValue.
2534 if (getLangOpts().CUDA && getLangOpts().CUDAIsDevice &&
2535 D->hasAttr<CUDASharedAttr>())
2536 Init = llvm::UndefValue::get(getTypes().ConvertType(ASTTy));
2537 else if (!InitExpr) {
2538 // This is a tentative definition; tentative definitions are
2539 // implicitly initialized with { 0 }.
2541 // Note that tentative definitions are only emitted at the end of
2542 // a translation unit, so they should never have incomplete
2543 // type. In addition, EmitTentativeDefinition makes sure that we
2544 // never attempt to emit a tentative definition if a real one
2545 // exists. A use may still exists, however, so we still may need
2547 assert(!ASTTy->isIncompleteType() && "Unexpected incomplete type");
2548 Init = EmitNullConstant(D->getType());
2550 initializedGlobalDecl = GlobalDecl(D);
2551 Init = EmitConstantInit(*InitDecl);
2554 QualType T = InitExpr->getType();
2555 if (D->getType()->isReferenceType())
2558 if (getLangOpts().CPlusPlus) {
2559 Init = EmitNullConstant(T);
2560 NeedsGlobalCtor = true;
2562 ErrorUnsupported(D, "static initializer");
2563 Init = llvm::UndefValue::get(getTypes().ConvertType(T));
2566 // We don't need an initializer, so remove the entry for the delayed
2567 // initializer position (just in case this entry was delayed) if we
2568 // also don't need to register a destructor.
2569 if (getLangOpts().CPlusPlus && !NeedsGlobalDtor)
2570 DelayedCXXInitPosition.erase(D);
2574 llvm::Type* InitType = Init->getType();
2575 llvm::Constant *Entry =
2576 GetAddrOfGlobalVar(D, InitType, ForDefinition_t(!IsTentative));
2578 // Strip off a bitcast if we got one back.
2579 if (auto *CE = dyn_cast<llvm::ConstantExpr>(Entry)) {
2580 assert(CE->getOpcode() == llvm::Instruction::BitCast ||
2581 CE->getOpcode() == llvm::Instruction::AddrSpaceCast ||
2582 // All zero index gep.
2583 CE->getOpcode() == llvm::Instruction::GetElementPtr);
2584 Entry = CE->getOperand(0);
2587 // Entry is now either a Function or GlobalVariable.
2588 auto *GV = dyn_cast<llvm::GlobalVariable>(Entry);
2590 // We have a definition after a declaration with the wrong type.
2591 // We must make a new GlobalVariable* and update everything that used OldGV
2592 // (a declaration or tentative definition) with the new GlobalVariable*
2593 // (which will be a definition).
2595 // This happens if there is a prototype for a global (e.g.
2596 // "extern int x[];") and then a definition of a different type (e.g.
2597 // "int x[10];"). This also happens when an initializer has a different type
2598 // from the type of the global (this happens with unions).
2600 GV->getType()->getElementType() != InitType ||
2601 GV->getType()->getAddressSpace() !=
2602 GetGlobalVarAddressSpace(D, getContext().getTargetAddressSpace(ASTTy))) {
2604 // Move the old entry aside so that we'll create a new one.
2605 Entry->setName(StringRef());
2607 // Make a new global with the correct type, this is now guaranteed to work.
2608 GV = cast<llvm::GlobalVariable>(
2609 GetAddrOfGlobalVar(D, InitType, ForDefinition_t(!IsTentative)));
2611 // Replace all uses of the old global with the new global
2612 llvm::Constant *NewPtrForOldDecl =
2613 llvm::ConstantExpr::getBitCast(GV, Entry->getType());
2614 Entry->replaceAllUsesWith(NewPtrForOldDecl);
2616 // Erase the old global, since it is no longer used.
2617 cast<llvm::GlobalValue>(Entry)->eraseFromParent();
2620 MaybeHandleStaticInExternC(D, GV);
2622 if (D->hasAttr<AnnotateAttr>())
2623 AddGlobalAnnotations(D, GV);
2625 // Set the llvm linkage type as appropriate.
2626 llvm::GlobalValue::LinkageTypes Linkage =
2627 getLLVMLinkageVarDefinition(D, GV->isConstant());
2629 // CUDA B.2.1 "The __device__ qualifier declares a variable that resides on
2630 // the device. [...]"
2631 // CUDA B.2.2 "The __constant__ qualifier, optionally used together with
2632 // __device__, declares a variable that: [...]
2633 // Is accessible from all the threads within the grid and from the host
2634 // through the runtime library (cudaGetSymbolAddress() / cudaGetSymbolSize()
2635 // / cudaMemcpyToSymbol() / cudaMemcpyFromSymbol())."
2636 if (GV && LangOpts.CUDA) {
2637 if (LangOpts.CUDAIsDevice) {
2638 if (D->hasAttr<CUDADeviceAttr>() || D->hasAttr<CUDAConstantAttr>())
2639 GV->setExternallyInitialized(true);
2641 // Host-side shadows of external declarations of device-side
2642 // global variables become internal definitions. These have to
2643 // be internal in order to prevent name conflicts with global
2644 // host variables with the same name in a different TUs.
2645 if (D->hasAttr<CUDADeviceAttr>() || D->hasAttr<CUDAConstantAttr>()) {
2646 Linkage = llvm::GlobalValue::InternalLinkage;
2648 // Shadow variables and their properties must be registered
2649 // with CUDA runtime.
2651 if (!D->hasDefinition())
2652 Flags |= CGCUDARuntime::ExternDeviceVar;
2653 if (D->hasAttr<CUDAConstantAttr>())
2654 Flags |= CGCUDARuntime::ConstantDeviceVar;
2655 getCUDARuntime().registerDeviceVar(*GV, Flags);
2656 } else if (D->hasAttr<CUDASharedAttr>())
2657 // __shared__ variables are odd. Shadows do get created, but
2658 // they are not registered with the CUDA runtime, so they
2659 // can't really be used to access their device-side
2660 // counterparts. It's not clear yet whether it's nvcc's bug or
2661 // a feature, but we've got to do the same for compatibility.
2662 Linkage = llvm::GlobalValue::InternalLinkage;
2665 GV->setInitializer(Init);
2667 // If it is safe to mark the global 'constant', do so now.
2668 GV->setConstant(!NeedsGlobalCtor && !NeedsGlobalDtor &&
2669 isTypeConstant(D->getType(), true));
2671 // If it is in a read-only section, mark it 'constant'.
2672 if (const SectionAttr *SA = D->getAttr<SectionAttr>()) {
2673 const ASTContext::SectionInfo &SI = Context.SectionInfos[SA->getName()];
2674 if ((SI.SectionFlags & ASTContext::PSF_Write) == 0)
2675 GV->setConstant(true);
2678 GV->setAlignment(getContext().getDeclAlign(D).getQuantity());
2681 // On Darwin, if the normal linkage of a C++ thread_local variable is
2682 // LinkOnce or Weak, we keep the normal linkage to prevent multiple
2683 // copies within a linkage unit; otherwise, the backing variable has
2684 // internal linkage and all accesses should just be calls to the
2685 // Itanium-specified entry point, which has the normal linkage of the
2686 // variable. This is to preserve the ability to change the implementation
2687 // behind the scenes.
2688 if (!D->isStaticLocal() && D->getTLSKind() == VarDecl::TLS_Dynamic &&
2689 Context.getTargetInfo().getTriple().isOSDarwin() &&
2690 !llvm::GlobalVariable::isLinkOnceLinkage(Linkage) &&
2691 !llvm::GlobalVariable::isWeakLinkage(Linkage))
2692 Linkage = llvm::GlobalValue::InternalLinkage;
2694 GV->setLinkage(Linkage);
2695 if (D->hasAttr<DLLImportAttr>())
2696 GV->setDLLStorageClass(llvm::GlobalVariable::DLLImportStorageClass);
2697 else if (D->hasAttr<DLLExportAttr>())
2698 GV->setDLLStorageClass(llvm::GlobalVariable::DLLExportStorageClass);
2700 GV->setDLLStorageClass(llvm::GlobalVariable::DefaultStorageClass);
2702 if (Linkage == llvm::GlobalVariable::CommonLinkage) {
2703 // common vars aren't constant even if declared const.
2704 GV->setConstant(false);
2705 // Tentative definition of global variables may be initialized with
2706 // non-zero null pointers. In this case they should have weak linkage
2707 // since common linkage must have zero initializer and must not have
2708 // explicit section therefore cannot have non-zero initial value.
2709 if (!GV->getInitializer()->isNullValue())
2710 GV->setLinkage(llvm::GlobalVariable::WeakAnyLinkage);
2713 setNonAliasAttributes(D, GV);
2715 if (D->getTLSKind() && !GV->isThreadLocal()) {
2716 if (D->getTLSKind() == VarDecl::TLS_Dynamic)
2717 CXXThreadLocals.push_back(D);
2721 maybeSetTrivialComdat(*D, *GV);
2723 // Emit the initializer function if necessary.
2724 if (NeedsGlobalCtor || NeedsGlobalDtor)
2725 EmitCXXGlobalVarDeclInitFunc(D, GV, NeedsGlobalCtor);
2727 SanitizerMD->reportGlobalToASan(GV, *D, NeedsGlobalCtor);
2729 // Emit global variable debug information.
2730 if (CGDebugInfo *DI = getModuleDebugInfo())
2731 if (getCodeGenOpts().getDebugInfo() >= codegenoptions::LimitedDebugInfo)
2732 DI->EmitGlobalVariable(GV, D);
2735 static bool isVarDeclStrongDefinition(const ASTContext &Context,
2736 CodeGenModule &CGM, const VarDecl *D,
2738 // Don't give variables common linkage if -fno-common was specified unless it
2739 // was overridden by a NoCommon attribute.
2740 if ((NoCommon || D->hasAttr<NoCommonAttr>()) && !D->hasAttr<CommonAttr>())
2744 // A declaration of an identifier for an object that has file scope without
2745 // an initializer, and without a storage-class specifier or with the
2746 // storage-class specifier static, constitutes a tentative definition.
2747 if (D->getInit() || D->hasExternalStorage())
2750 // A variable cannot be both common and exist in a section.
2751 if (D->hasAttr<SectionAttr>())
2754 // Thread local vars aren't considered common linkage.
2755 if (D->getTLSKind())
2758 // Tentative definitions marked with WeakImportAttr are true definitions.
2759 if (D->hasAttr<WeakImportAttr>())
2762 // A variable cannot be both common and exist in a comdat.
2763 if (shouldBeInCOMDAT(CGM, *D))
2766 // Declarations with a required alignment do not have common linkage in MSVC
2768 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
2769 if (D->hasAttr<AlignedAttr>())
2771 QualType VarType = D->getType();
2772 if (Context.isAlignmentRequired(VarType))
2775 if (const auto *RT = VarType->getAs<RecordType>()) {
2776 const RecordDecl *RD = RT->getDecl();
2777 for (const FieldDecl *FD : RD->fields()) {
2778 if (FD->isBitField())
2780 if (FD->hasAttr<AlignedAttr>())
2782 if (Context.isAlignmentRequired(FD->getType()))
2791 llvm::GlobalValue::LinkageTypes CodeGenModule::getLLVMLinkageForDeclarator(
2792 const DeclaratorDecl *D, GVALinkage Linkage, bool IsConstantVariable) {
2793 if (Linkage == GVA_Internal)
2794 return llvm::Function::InternalLinkage;
2796 if (D->hasAttr<WeakAttr>()) {
2797 if (IsConstantVariable)
2798 return llvm::GlobalVariable::WeakODRLinkage;
2800 return llvm::GlobalVariable::WeakAnyLinkage;
2803 // We are guaranteed to have a strong definition somewhere else,
2804 // so we can use available_externally linkage.
2805 if (Linkage == GVA_AvailableExternally)
2806 return llvm::Function::AvailableExternallyLinkage;
2808 // Note that Apple's kernel linker doesn't support symbol
2809 // coalescing, so we need to avoid linkonce and weak linkages there.
2810 // Normally, this means we just map to internal, but for explicit
2811 // instantiations we'll map to external.
2813 // In C++, the compiler has to emit a definition in every translation unit
2814 // that references the function. We should use linkonce_odr because
2815 // a) if all references in this translation unit are optimized away, we
2816 // don't need to codegen it. b) if the function persists, it needs to be
2817 // merged with other definitions. c) C++ has the ODR, so we know the
2818 // definition is dependable.
2819 if (Linkage == GVA_DiscardableODR)
2820 return !Context.getLangOpts().AppleKext ? llvm::Function::LinkOnceODRLinkage
2821 : llvm::Function::InternalLinkage;
2823 // An explicit instantiation of a template has weak linkage, since
2824 // explicit instantiations can occur in multiple translation units
2825 // and must all be equivalent. However, we are not allowed to
2826 // throw away these explicit instantiations.
2828 // We don't currently support CUDA device code spread out across multiple TUs,
2829 // so say that CUDA templates are either external (for kernels) or internal.
2830 // This lets llvm perform aggressive inter-procedural optimizations.
2831 if (Linkage == GVA_StrongODR) {
2832 if (Context.getLangOpts().AppleKext)
2833 return llvm::Function::ExternalLinkage;
2834 if (Context.getLangOpts().CUDA && Context.getLangOpts().CUDAIsDevice)
2835 return D->hasAttr<CUDAGlobalAttr>() ? llvm::Function::ExternalLinkage
2836 : llvm::Function::InternalLinkage;
2837 return llvm::Function::WeakODRLinkage;
2840 // C++ doesn't have tentative definitions and thus cannot have common
2842 if (!getLangOpts().CPlusPlus && isa<VarDecl>(D) &&
2843 !isVarDeclStrongDefinition(Context, *this, cast<VarDecl>(D),
2844 CodeGenOpts.NoCommon))
2845 return llvm::GlobalVariable::CommonLinkage;
2847 // selectany symbols are externally visible, so use weak instead of
2848 // linkonce. MSVC optimizes away references to const selectany globals, so
2849 // all definitions should be the same and ODR linkage should be used.
2850 // http://msdn.microsoft.com/en-us/library/5tkz6s71.aspx
2851 if (D->hasAttr<SelectAnyAttr>())
2852 return llvm::GlobalVariable::WeakODRLinkage;
2854 // Otherwise, we have strong external linkage.
2855 assert(Linkage == GVA_StrongExternal);
2856 return llvm::GlobalVariable::ExternalLinkage;
2859 llvm::GlobalValue::LinkageTypes CodeGenModule::getLLVMLinkageVarDefinition(
2860 const VarDecl *VD, bool IsConstant) {
2861 GVALinkage Linkage = getContext().GetGVALinkageForVariable(VD);
2862 return getLLVMLinkageForDeclarator(VD, Linkage, IsConstant);
2865 /// Replace the uses of a function that was declared with a non-proto type.
2866 /// We want to silently drop extra arguments from call sites
2867 static void replaceUsesOfNonProtoConstant(llvm::Constant *old,
2868 llvm::Function *newFn) {
2870 if (old->use_empty()) return;
2872 llvm::Type *newRetTy = newFn->getReturnType();
2873 SmallVector<llvm::Value*, 4> newArgs;
2874 SmallVector<llvm::OperandBundleDef, 1> newBundles;
2876 for (llvm::Value::use_iterator ui = old->use_begin(), ue = old->use_end();
2878 llvm::Value::use_iterator use = ui++; // Increment before the use is erased.
2879 llvm::User *user = use->getUser();
2881 // Recognize and replace uses of bitcasts. Most calls to
2882 // unprototyped functions will use bitcasts.
2883 if (auto *bitcast = dyn_cast<llvm::ConstantExpr>(user)) {
2884 if (bitcast->getOpcode() == llvm::Instruction::BitCast)
2885 replaceUsesOfNonProtoConstant(bitcast, newFn);
2889 // Recognize calls to the function.
2890 llvm::CallSite callSite(user);
2891 if (!callSite) continue;
2892 if (!callSite.isCallee(&*use)) continue;
2894 // If the return types don't match exactly, then we can't
2895 // transform this call unless it's dead.
2896 if (callSite->getType() != newRetTy && !callSite->use_empty())
2899 // Get the call site's attribute list.
2900 SmallVector<llvm::AttributeSet, 8> newAttrs;
2901 llvm::AttributeSet oldAttrs = callSite.getAttributes();
2903 // Collect any return attributes from the call.
2904 if (oldAttrs.hasAttributes(llvm::AttributeSet::ReturnIndex))
2906 llvm::AttributeSet::get(newFn->getContext(),
2907 oldAttrs.getRetAttributes()));
2909 // If the function was passed too few arguments, don't transform.
2910 unsigned newNumArgs = newFn->arg_size();
2911 if (callSite.arg_size() < newNumArgs) continue;
2913 // If extra arguments were passed, we silently drop them.
2914 // If any of the types mismatch, we don't transform.
2916 bool dontTransform = false;
2917 for (llvm::Function::arg_iterator ai = newFn->arg_begin(),
2918 ae = newFn->arg_end(); ai != ae; ++ai, ++argNo) {
2919 if (callSite.getArgument(argNo)->getType() != ai->getType()) {
2920 dontTransform = true;
2924 // Add any parameter attributes.
2925 if (oldAttrs.hasAttributes(argNo + 1))
2928 AttributeSet::get(newFn->getContext(),
2929 oldAttrs.getParamAttributes(argNo + 1)));
2934 if (oldAttrs.hasAttributes(llvm::AttributeSet::FunctionIndex))
2935 newAttrs.push_back(llvm::AttributeSet::get(newFn->getContext(),
2936 oldAttrs.getFnAttributes()));
2938 // Okay, we can transform this. Create the new call instruction and copy
2939 // over the required information.
2940 newArgs.append(callSite.arg_begin(), callSite.arg_begin() + argNo);
2942 // Copy over any operand bundles.
2943 callSite.getOperandBundlesAsDefs(newBundles);
2945 llvm::CallSite newCall;
2946 if (callSite.isCall()) {
2947 newCall = llvm::CallInst::Create(newFn, newArgs, newBundles, "",
2948 callSite.getInstruction());
2950 auto *oldInvoke = cast<llvm::InvokeInst>(callSite.getInstruction());
2951 newCall = llvm::InvokeInst::Create(newFn,
2952 oldInvoke->getNormalDest(),
2953 oldInvoke->getUnwindDest(),
2954 newArgs, newBundles, "",
2955 callSite.getInstruction());
2957 newArgs.clear(); // for the next iteration
2959 if (!newCall->getType()->isVoidTy())
2960 newCall->takeName(callSite.getInstruction());
2961 newCall.setAttributes(
2962 llvm::AttributeSet::get(newFn->getContext(), newAttrs));
2963 newCall.setCallingConv(callSite.getCallingConv());
2965 // Finally, remove the old call, replacing any uses with the new one.
2966 if (!callSite->use_empty())
2967 callSite->replaceAllUsesWith(newCall.getInstruction());
2969 // Copy debug location attached to CI.
2970 if (callSite->getDebugLoc())
2971 newCall->setDebugLoc(callSite->getDebugLoc());
2973 callSite->eraseFromParent();
2977 /// ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we
2978 /// implement a function with no prototype, e.g. "int foo() {}". If there are
2979 /// existing call uses of the old function in the module, this adjusts them to
2980 /// call the new function directly.
2982 /// This is not just a cleanup: the always_inline pass requires direct calls to
2983 /// functions to be able to inline them. If there is a bitcast in the way, it
2984 /// won't inline them. Instcombine normally deletes these calls, but it isn't
2986 static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old,
2987 llvm::Function *NewFn) {
2988 // If we're redefining a global as a function, don't transform it.
2989 if (!isa<llvm::Function>(Old)) return;
2991 replaceUsesOfNonProtoConstant(Old, NewFn);
2994 void CodeGenModule::HandleCXXStaticMemberVarInstantiation(VarDecl *VD) {
2995 auto DK = VD->isThisDeclarationADefinition();
2996 if (DK == VarDecl::Definition && VD->hasAttr<DLLImportAttr>())
2999 TemplateSpecializationKind TSK = VD->getTemplateSpecializationKind();
3000 // If we have a definition, this might be a deferred decl. If the
3001 // instantiation is explicit, make sure we emit it at the end.
3002 if (VD->getDefinition() && TSK == TSK_ExplicitInstantiationDefinition)
3003 GetAddrOfGlobalVar(VD);
3005 EmitTopLevelDecl(VD);
3008 void CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD,
3009 llvm::GlobalValue *GV) {
3010 const auto *D = cast<FunctionDecl>(GD.getDecl());
3012 // Compute the function info and LLVM type.
3013 const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
3014 llvm::FunctionType *Ty = getTypes().GetFunctionType(FI);
3016 // Get or create the prototype for the function.
3017 if (!GV || (GV->getType()->getElementType() != Ty))
3018 GV = cast<llvm::GlobalValue>(GetAddrOfFunction(GD, Ty, /*ForVTable=*/false,
3023 if (!GV->isDeclaration())
3026 // We need to set linkage and visibility on the function before
3027 // generating code for it because various parts of IR generation
3028 // want to propagate this information down (e.g. to local static
3030 auto *Fn = cast<llvm::Function>(GV);
3031 setFunctionLinkage(GD, Fn);
3032 setFunctionDLLStorageClass(GD, Fn);
3034 // FIXME: this is redundant with part of setFunctionDefinitionAttributes
3035 setGlobalVisibility(Fn, D);
3037 MaybeHandleStaticInExternC(D, Fn);
3039 maybeSetTrivialComdat(*D, *Fn);
3041 CodeGenFunction(*this).GenerateCode(D, Fn, FI);
3043 setFunctionDefinitionAttributes(D, Fn);
3044 SetLLVMFunctionAttributesForDefinition(D, Fn);
3046 if (const ConstructorAttr *CA = D->getAttr<ConstructorAttr>())
3047 AddGlobalCtor(Fn, CA->getPriority());
3048 if (const DestructorAttr *DA = D->getAttr<DestructorAttr>())
3049 AddGlobalDtor(Fn, DA->getPriority());
3050 if (D->hasAttr<AnnotateAttr>())
3051 AddGlobalAnnotations(D, Fn);
3054 void CodeGenModule::EmitAliasDefinition(GlobalDecl GD) {
3055 const auto *D = cast<ValueDecl>(GD.getDecl());
3056 const AliasAttr *AA = D->getAttr<AliasAttr>();
3057 assert(AA && "Not an alias?");
3059 StringRef MangledName = getMangledName(GD);
3061 if (AA->getAliasee() == MangledName) {
3062 Diags.Report(AA->getLocation(), diag::err_cyclic_alias) << 0;
3066 // If there is a definition in the module, then it wins over the alias.
3067 // This is dubious, but allow it to be safe. Just ignore the alias.
3068 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
3069 if (Entry && !Entry->isDeclaration())
3072 Aliases.push_back(GD);
3074 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType());
3076 // Create a reference to the named value. This ensures that it is emitted
3077 // if a deferred decl.
3078 llvm::Constant *Aliasee;
3079 if (isa<llvm::FunctionType>(DeclTy))
3080 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy, GD,
3081 /*ForVTable=*/false);
3083 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
3084 llvm::PointerType::getUnqual(DeclTy),
3087 // Create the new alias itself, but don't set a name yet.
3088 auto *GA = llvm::GlobalAlias::create(
3089 DeclTy, 0, llvm::Function::ExternalLinkage, "", Aliasee, &getModule());
3092 if (GA->getAliasee() == Entry) {
3093 Diags.Report(AA->getLocation(), diag::err_cyclic_alias) << 0;
3097 assert(Entry->isDeclaration());
3099 // If there is a declaration in the module, then we had an extern followed
3100 // by the alias, as in:
3101 // extern int test6();
3103 // int test6() __attribute__((alias("test7")));
3105 // Remove it and replace uses of it with the alias.
3106 GA->takeName(Entry);
3108 Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GA,
3110 Entry->eraseFromParent();
3112 GA->setName(MangledName);
3115 // Set attributes which are particular to an alias; this is a
3116 // specialization of the attributes which may be set on a global
3117 // variable/function.
3118 if (D->hasAttr<WeakAttr>() || D->hasAttr<WeakRefAttr>() ||
3119 D->isWeakImported()) {
3120 GA->setLinkage(llvm::Function::WeakAnyLinkage);
3123 if (const auto *VD = dyn_cast<VarDecl>(D))
3124 if (VD->getTLSKind())
3125 setTLSMode(GA, *VD);
3127 setAliasAttributes(D, GA);
3130 void CodeGenModule::emitIFuncDefinition(GlobalDecl GD) {
3131 const auto *D = cast<ValueDecl>(GD.getDecl());
3132 const IFuncAttr *IFA = D->getAttr<IFuncAttr>();
3133 assert(IFA && "Not an ifunc?");
3135 StringRef MangledName = getMangledName(GD);
3137 if (IFA->getResolver() == MangledName) {
3138 Diags.Report(IFA->getLocation(), diag::err_cyclic_alias) << 1;
3142 // Report an error if some definition overrides ifunc.
3143 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
3144 if (Entry && !Entry->isDeclaration()) {
3146 if (lookupRepresentativeDecl(MangledName, OtherGD) &&
3147 DiagnosedConflictingDefinitions.insert(GD).second) {
3148 Diags.Report(D->getLocation(), diag::err_duplicate_mangled_name);
3149 Diags.Report(OtherGD.getDecl()->getLocation(),
3150 diag::note_previous_definition);
3155 Aliases.push_back(GD);
3157 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType());
3158 llvm::Constant *Resolver =
3159 GetOrCreateLLVMFunction(IFA->getResolver(), DeclTy, GD,
3160 /*ForVTable=*/false);
3161 llvm::GlobalIFunc *GIF =
3162 llvm::GlobalIFunc::create(DeclTy, 0, llvm::Function::ExternalLinkage,
3163 "", Resolver, &getModule());
3165 if (GIF->getResolver() == Entry) {
3166 Diags.Report(IFA->getLocation(), diag::err_cyclic_alias) << 1;
3169 assert(Entry->isDeclaration());
3171 // If there is a declaration in the module, then we had an extern followed
3172 // by the ifunc, as in:
3173 // extern int test();
3175 // int test() __attribute__((ifunc("resolver")));
3177 // Remove it and replace uses of it with the ifunc.
3178 GIF->takeName(Entry);
3180 Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GIF,
3182 Entry->eraseFromParent();
3184 GIF->setName(MangledName);
3186 SetCommonAttributes(D, GIF);
3189 llvm::Function *CodeGenModule::getIntrinsic(unsigned IID,
3190 ArrayRef<llvm::Type*> Tys) {
3191 return llvm::Intrinsic::getDeclaration(&getModule(), (llvm::Intrinsic::ID)IID,
3195 static llvm::StringMapEntry<llvm::GlobalVariable *> &
3196 GetConstantCFStringEntry(llvm::StringMap<llvm::GlobalVariable *> &Map,
3197 const StringLiteral *Literal, bool TargetIsLSB,
3198 bool &IsUTF16, unsigned &StringLength) {
3199 StringRef String = Literal->getString();
3200 unsigned NumBytes = String.size();
3202 // Check for simple case.
3203 if (!Literal->containsNonAsciiOrNull()) {
3204 StringLength = NumBytes;
3205 return *Map.insert(std::make_pair(String, nullptr)).first;
3208 // Otherwise, convert the UTF8 literals into a string of shorts.
3211 SmallVector<llvm::UTF16, 128> ToBuf(NumBytes + 1); // +1 for ending nulls.
3212 const llvm::UTF8 *FromPtr = (const llvm::UTF8 *)String.data();
3213 llvm::UTF16 *ToPtr = &ToBuf[0];
3215 (void)llvm::ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes, &ToPtr,
3216 ToPtr + NumBytes, llvm::strictConversion);
3218 // ConvertUTF8toUTF16 returns the length in ToPtr.
3219 StringLength = ToPtr - &ToBuf[0];
3221 // Add an explicit null.
3223 return *Map.insert(std::make_pair(
3224 StringRef(reinterpret_cast<const char *>(ToBuf.data()),
3225 (StringLength + 1) * 2),
3230 CodeGenModule::GetAddrOfConstantCFString(const StringLiteral *Literal) {
3231 unsigned StringLength = 0;
3232 bool isUTF16 = false;
3233 llvm::StringMapEntry<llvm::GlobalVariable *> &Entry =
3234 GetConstantCFStringEntry(CFConstantStringMap, Literal,
3235 getDataLayout().isLittleEndian(), isUTF16,
3238 if (auto *C = Entry.second)
3239 return ConstantAddress(C, CharUnits::fromQuantity(C->getAlignment()));
3241 llvm::Constant *Zero = llvm::Constant::getNullValue(Int32Ty);
3242 llvm::Constant *Zeros[] = { Zero, Zero };
3244 // If we don't already have it, get __CFConstantStringClassReference.
3245 if (!CFConstantStringClassRef) {
3246 llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy);
3247 Ty = llvm::ArrayType::get(Ty, 0);
3248 llvm::Constant *GV =
3249 CreateRuntimeVariable(Ty, "__CFConstantStringClassReference");
3251 if (getTriple().isOSBinFormatCOFF()) {
3252 IdentifierInfo &II = getContext().Idents.get(GV->getName());
3253 TranslationUnitDecl *TUDecl = getContext().getTranslationUnitDecl();
3254 DeclContext *DC = TranslationUnitDecl::castToDeclContext(TUDecl);
3255 llvm::GlobalValue *CGV = cast<llvm::GlobalValue>(GV);
3257 const VarDecl *VD = nullptr;
3258 for (const auto &Result : DC->lookup(&II))
3259 if ((VD = dyn_cast<VarDecl>(Result)))
3262 if (!VD || !VD->hasAttr<DLLExportAttr>()) {
3263 CGV->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
3264 CGV->setLinkage(llvm::GlobalValue::ExternalLinkage);
3266 CGV->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
3267 CGV->setLinkage(llvm::GlobalValue::ExternalLinkage);
3271 // Decay array -> ptr
3272 CFConstantStringClassRef =
3273 llvm::ConstantExpr::getGetElementPtr(Ty, GV, Zeros);
3276 QualType CFTy = getContext().getCFConstantStringType();
3278 auto *STy = cast<llvm::StructType>(getTypes().ConvertType(CFTy));
3280 ConstantInitBuilder Builder(*this);
3281 auto Fields = Builder.beginStruct(STy);
3284 Fields.add(cast<llvm::ConstantExpr>(CFConstantStringClassRef));
3287 Fields.addInt(IntTy, isUTF16 ? 0x07d0 : 0x07C8);
3290 llvm::Constant *C = nullptr;
3292 auto Arr = llvm::makeArrayRef(
3293 reinterpret_cast<uint16_t *>(const_cast<char *>(Entry.first().data())),
3294 Entry.first().size() / 2);
3295 C = llvm::ConstantDataArray::get(VMContext, Arr);
3297 C = llvm::ConstantDataArray::getString(VMContext, Entry.first());
3300 // Note: -fwritable-strings doesn't make the backing store strings of
3301 // CFStrings writable. (See <rdar://problem/10657500>)
3303 new llvm::GlobalVariable(getModule(), C->getType(), /*isConstant=*/true,
3304 llvm::GlobalValue::PrivateLinkage, C, ".str");
3305 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
3306 // Don't enforce the target's minimum global alignment, since the only use
3307 // of the string is via this class initializer.
3308 CharUnits Align = isUTF16
3309 ? getContext().getTypeAlignInChars(getContext().ShortTy)
3310 : getContext().getTypeAlignInChars(getContext().CharTy);
3311 GV->setAlignment(Align.getQuantity());
3313 // FIXME: We set the section explicitly to avoid a bug in ld64 224.1.
3314 // Without it LLVM can merge the string with a non unnamed_addr one during
3315 // LTO. Doing that changes the section it ends in, which surprises ld64.
3316 if (getTriple().isOSBinFormatMachO())
3317 GV->setSection(isUTF16 ? "__TEXT,__ustring"
3318 : "__TEXT,__cstring,cstring_literals");
3321 llvm::Constant *Str =
3322 llvm::ConstantExpr::getGetElementPtr(GV->getValueType(), GV, Zeros);
3325 // Cast the UTF16 string to the correct type.
3326 Str = llvm::ConstantExpr::getBitCast(Str, Int8PtrTy);
3330 auto Ty = getTypes().ConvertType(getContext().LongTy);
3331 Fields.addInt(cast<llvm::IntegerType>(Ty), StringLength);
3333 CharUnits Alignment = getPointerAlign();
3336 GV = Fields.finishAndCreateGlobal("_unnamed_cfstring_", Alignment,
3337 /*isConstant=*/false,
3338 llvm::GlobalVariable::PrivateLinkage);
3339 switch (getTriple().getObjectFormat()) {
3340 case llvm::Triple::UnknownObjectFormat:
3341 llvm_unreachable("unknown file format");
3342 case llvm::Triple::COFF:
3343 case llvm::Triple::ELF:
3344 GV->setSection("cfstring");
3346 case llvm::Triple::MachO:
3347 GV->setSection("__DATA,__cfstring");
3352 return ConstantAddress(GV, Alignment);
3355 QualType CodeGenModule::getObjCFastEnumerationStateType() {
3356 if (ObjCFastEnumerationStateType.isNull()) {
3357 RecordDecl *D = Context.buildImplicitRecord("__objcFastEnumerationState");
3358 D->startDefinition();
3360 QualType FieldTypes[] = {
3361 Context.UnsignedLongTy,
3362 Context.getPointerType(Context.getObjCIdType()),
3363 Context.getPointerType(Context.UnsignedLongTy),
3364 Context.getConstantArrayType(Context.UnsignedLongTy,
3365 llvm::APInt(32, 5), ArrayType::Normal, 0)
3368 for (size_t i = 0; i < 4; ++i) {
3369 FieldDecl *Field = FieldDecl::Create(Context,
3372 SourceLocation(), nullptr,
3373 FieldTypes[i], /*TInfo=*/nullptr,
3374 /*BitWidth=*/nullptr,
3377 Field->setAccess(AS_public);
3381 D->completeDefinition();
3382 ObjCFastEnumerationStateType = Context.getTagDeclType(D);
3385 return ObjCFastEnumerationStateType;
3389 CodeGenModule::GetConstantArrayFromStringLiteral(const StringLiteral *E) {
3390 assert(!E->getType()->isPointerType() && "Strings are always arrays");
3392 // Don't emit it as the address of the string, emit the string data itself
3393 // as an inline array.
3394 if (E->getCharByteWidth() == 1) {
3395 SmallString<64> Str(E->getString());
3397 // Resize the string to the right size, which is indicated by its type.
3398 const ConstantArrayType *CAT = Context.getAsConstantArrayType(E->getType());
3399 Str.resize(CAT->getSize().getZExtValue());
3400 return llvm::ConstantDataArray::getString(VMContext, Str, false);
3403 auto *AType = cast<llvm::ArrayType>(getTypes().ConvertType(E->getType()));
3404 llvm::Type *ElemTy = AType->getElementType();
3405 unsigned NumElements = AType->getNumElements();
3407 // Wide strings have either 2-byte or 4-byte elements.
3408 if (ElemTy->getPrimitiveSizeInBits() == 16) {
3409 SmallVector<uint16_t, 32> Elements;
3410 Elements.reserve(NumElements);
3412 for(unsigned i = 0, e = E->getLength(); i != e; ++i)
3413 Elements.push_back(E->getCodeUnit(i));
3414 Elements.resize(NumElements);
3415 return llvm::ConstantDataArray::get(VMContext, Elements);
3418 assert(ElemTy->getPrimitiveSizeInBits() == 32);
3419 SmallVector<uint32_t, 32> Elements;
3420 Elements.reserve(NumElements);
3422 for(unsigned i = 0, e = E->getLength(); i != e; ++i)
3423 Elements.push_back(E->getCodeUnit(i));
3424 Elements.resize(NumElements);
3425 return llvm::ConstantDataArray::get(VMContext, Elements);
3428 static llvm::GlobalVariable *
3429 GenerateStringLiteral(llvm::Constant *C, llvm::GlobalValue::LinkageTypes LT,
3430 CodeGenModule &CGM, StringRef GlobalName,
3431 CharUnits Alignment) {
3432 // OpenCL v1.2 s6.5.3: a string literal is in the constant address space.
3433 unsigned AddrSpace = 0;
3434 if (CGM.getLangOpts().OpenCL)
3435 AddrSpace = CGM.getContext().getTargetAddressSpace(LangAS::opencl_constant);
3437 llvm::Module &M = CGM.getModule();
3438 // Create a global variable for this string
3439 auto *GV = new llvm::GlobalVariable(
3440 M, C->getType(), !CGM.getLangOpts().WritableStrings, LT, C, GlobalName,
3441 nullptr, llvm::GlobalVariable::NotThreadLocal, AddrSpace);
3442 GV->setAlignment(Alignment.getQuantity());
3443 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
3444 if (GV->isWeakForLinker()) {
3445 assert(CGM.supportsCOMDAT() && "Only COFF uses weak string literals");
3446 GV->setComdat(M.getOrInsertComdat(GV->getName()));
3452 /// GetAddrOfConstantStringFromLiteral - Return a pointer to a
3453 /// constant array for the given string literal.
3455 CodeGenModule::GetAddrOfConstantStringFromLiteral(const StringLiteral *S,
3457 CharUnits Alignment = getContext().getAlignOfGlobalVarInChars(S->getType());
3459 llvm::Constant *C = GetConstantArrayFromStringLiteral(S);
3460 llvm::GlobalVariable **Entry = nullptr;
3461 if (!LangOpts.WritableStrings) {
3462 Entry = &ConstantStringMap[C];
3463 if (auto GV = *Entry) {
3464 if (Alignment.getQuantity() > GV->getAlignment())
3465 GV->setAlignment(Alignment.getQuantity());
3466 return ConstantAddress(GV, Alignment);
3470 SmallString<256> MangledNameBuffer;
3471 StringRef GlobalVariableName;
3472 llvm::GlobalValue::LinkageTypes LT;
3474 // Mangle the string literal if the ABI allows for it. However, we cannot
3475 // do this if we are compiling with ASan or -fwritable-strings because they
3476 // rely on strings having normal linkage.
3477 if (!LangOpts.WritableStrings &&
3478 !LangOpts.Sanitize.has(SanitizerKind::Address) &&
3479 getCXXABI().getMangleContext().shouldMangleStringLiteral(S)) {
3480 llvm::raw_svector_ostream Out(MangledNameBuffer);
3481 getCXXABI().getMangleContext().mangleStringLiteral(S, Out);
3483 LT = llvm::GlobalValue::LinkOnceODRLinkage;
3484 GlobalVariableName = MangledNameBuffer;
3486 LT = llvm::GlobalValue::PrivateLinkage;
3487 GlobalVariableName = Name;
3490 auto GV = GenerateStringLiteral(C, LT, *this, GlobalVariableName, Alignment);
3494 SanitizerMD->reportGlobalToASan(GV, S->getStrTokenLoc(0), "<string literal>",
3496 return ConstantAddress(GV, Alignment);
3499 /// GetAddrOfConstantStringFromObjCEncode - Return a pointer to a constant
3500 /// array for the given ObjCEncodeExpr node.
3502 CodeGenModule::GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *E) {
3504 getContext().getObjCEncodingForType(E->getEncodedType(), Str);
3506 return GetAddrOfConstantCString(Str);
3509 /// GetAddrOfConstantCString - Returns a pointer to a character array containing
3510 /// the literal and a terminating '\0' character.
3511 /// The result has pointer to array type.
3512 ConstantAddress CodeGenModule::GetAddrOfConstantCString(
3513 const std::string &Str, const char *GlobalName) {
3514 StringRef StrWithNull(Str.c_str(), Str.size() + 1);
3515 CharUnits Alignment =
3516 getContext().getAlignOfGlobalVarInChars(getContext().CharTy);
3519 llvm::ConstantDataArray::getString(getLLVMContext(), StrWithNull, false);
3521 // Don't share any string literals if strings aren't constant.
3522 llvm::GlobalVariable **Entry = nullptr;
3523 if (!LangOpts.WritableStrings) {
3524 Entry = &ConstantStringMap[C];
3525 if (auto GV = *Entry) {
3526 if (Alignment.getQuantity() > GV->getAlignment())
3527 GV->setAlignment(Alignment.getQuantity());
3528 return ConstantAddress(GV, Alignment);
3532 // Get the default prefix if a name wasn't specified.
3534 GlobalName = ".str";
3535 // Create a global variable for this.
3536 auto GV = GenerateStringLiteral(C, llvm::GlobalValue::PrivateLinkage, *this,
3537 GlobalName, Alignment);
3540 return ConstantAddress(GV, Alignment);
3543 ConstantAddress CodeGenModule::GetAddrOfGlobalTemporary(
3544 const MaterializeTemporaryExpr *E, const Expr *Init) {
3545 assert((E->getStorageDuration() == SD_Static ||
3546 E->getStorageDuration() == SD_Thread) && "not a global temporary");
3547 const auto *VD = cast<VarDecl>(E->getExtendingDecl());
3549 // If we're not materializing a subobject of the temporary, keep the
3550 // cv-qualifiers from the type of the MaterializeTemporaryExpr.
3551 QualType MaterializedType = Init->getType();
3552 if (Init == E->GetTemporaryExpr())
3553 MaterializedType = E->getType();
3555 CharUnits Align = getContext().getTypeAlignInChars(MaterializedType);
3557 if (llvm::Constant *Slot = MaterializedGlobalTemporaryMap[E])
3558 return ConstantAddress(Slot, Align);
3560 // FIXME: If an externally-visible declaration extends multiple temporaries,
3561 // we need to give each temporary the same name in every translation unit (and
3562 // we also need to make the temporaries externally-visible).
3563 SmallString<256> Name;
3564 llvm::raw_svector_ostream Out(Name);
3565 getCXXABI().getMangleContext().mangleReferenceTemporary(
3566 VD, E->getManglingNumber(), Out);
3568 APValue *Value = nullptr;
3569 if (E->getStorageDuration() == SD_Static) {
3570 // We might have a cached constant initializer for this temporary. Note
3571 // that this might have a different value from the value computed by
3572 // evaluating the initializer if the surrounding constant expression
3573 // modifies the temporary.
3574 Value = getContext().getMaterializedTemporaryValue(E, false);
3575 if (Value && Value->isUninit())
3579 // Try evaluating it now, it might have a constant initializer.
3580 Expr::EvalResult EvalResult;
3581 if (!Value && Init->EvaluateAsRValue(EvalResult, getContext()) &&
3582 !EvalResult.hasSideEffects())
3583 Value = &EvalResult.Val;
3585 llvm::Constant *InitialValue = nullptr;
3586 bool Constant = false;
3589 // The temporary has a constant initializer, use it.
3590 InitialValue = EmitConstantValue(*Value, MaterializedType, nullptr);
3591 Constant = isTypeConstant(MaterializedType, /*ExcludeCtor*/Value);
3592 Type = InitialValue->getType();
3594 // No initializer, the initialization will be provided when we
3595 // initialize the declaration which performed lifetime extension.
3596 Type = getTypes().ConvertTypeForMem(MaterializedType);
3599 // Create a global variable for this lifetime-extended temporary.
3600 llvm::GlobalValue::LinkageTypes Linkage =
3601 getLLVMLinkageVarDefinition(VD, Constant);
3602 if (Linkage == llvm::GlobalVariable::ExternalLinkage) {
3603 const VarDecl *InitVD;
3604 if (VD->isStaticDataMember() && VD->getAnyInitializer(InitVD) &&
3605 isa<CXXRecordDecl>(InitVD->getLexicalDeclContext())) {
3606 // Temporaries defined inside a class get linkonce_odr linkage because the
3607 // class can be defined in multipe translation units.
3608 Linkage = llvm::GlobalVariable::LinkOnceODRLinkage;
3610 // There is no need for this temporary to have external linkage if the
3611 // VarDecl has external linkage.
3612 Linkage = llvm::GlobalVariable::InternalLinkage;
3615 unsigned AddrSpace = GetGlobalVarAddressSpace(
3616 VD, getContext().getTargetAddressSpace(MaterializedType));
3617 auto *GV = new llvm::GlobalVariable(
3618 getModule(), Type, Constant, Linkage, InitialValue, Name.c_str(),
3619 /*InsertBefore=*/nullptr, llvm::GlobalVariable::NotThreadLocal,
3621 setGlobalVisibility(GV, VD);
3622 GV->setAlignment(Align.getQuantity());
3623 if (supportsCOMDAT() && GV->isWeakForLinker())
3624 GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
3625 if (VD->getTLSKind())
3626 setTLSMode(GV, *VD);
3627 MaterializedGlobalTemporaryMap[E] = GV;
3628 return ConstantAddress(GV, Align);
3631 /// EmitObjCPropertyImplementations - Emit information for synthesized
3632 /// properties for an implementation.
3633 void CodeGenModule::EmitObjCPropertyImplementations(const
3634 ObjCImplementationDecl *D) {
3635 for (const auto *PID : D->property_impls()) {
3636 // Dynamic is just for type-checking.
3637 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) {
3638 ObjCPropertyDecl *PD = PID->getPropertyDecl();
3640 // Determine which methods need to be implemented, some may have
3641 // been overridden. Note that ::isPropertyAccessor is not the method
3642 // we want, that just indicates if the decl came from a
3643 // property. What we want to know is if the method is defined in
3644 // this implementation.
3645 if (!D->getInstanceMethod(PD->getGetterName()))
3646 CodeGenFunction(*this).GenerateObjCGetter(
3647 const_cast<ObjCImplementationDecl *>(D), PID);
3648 if (!PD->isReadOnly() &&
3649 !D->getInstanceMethod(PD->getSetterName()))
3650 CodeGenFunction(*this).GenerateObjCSetter(
3651 const_cast<ObjCImplementationDecl *>(D), PID);
3656 static bool needsDestructMethod(ObjCImplementationDecl *impl) {
3657 const ObjCInterfaceDecl *iface = impl->getClassInterface();
3658 for (const ObjCIvarDecl *ivar = iface->all_declared_ivar_begin();
3659 ivar; ivar = ivar->getNextIvar())
3660 if (ivar->getType().isDestructedType())
3666 static bool AllTrivialInitializers(CodeGenModule &CGM,
3667 ObjCImplementationDecl *D) {
3668 CodeGenFunction CGF(CGM);
3669 for (ObjCImplementationDecl::init_iterator B = D->init_begin(),
3670 E = D->init_end(); B != E; ++B) {
3671 CXXCtorInitializer *CtorInitExp = *B;
3672 Expr *Init = CtorInitExp->getInit();
3673 if (!CGF.isTrivialInitializer(Init))
3679 /// EmitObjCIvarInitializations - Emit information for ivar initialization
3680 /// for an implementation.
3681 void CodeGenModule::EmitObjCIvarInitializations(ObjCImplementationDecl *D) {
3682 // We might need a .cxx_destruct even if we don't have any ivar initializers.
3683 if (needsDestructMethod(D)) {
3684 IdentifierInfo *II = &getContext().Idents.get(".cxx_destruct");
3685 Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
3686 ObjCMethodDecl *DTORMethod =
3687 ObjCMethodDecl::Create(getContext(), D->getLocation(), D->getLocation(),
3688 cxxSelector, getContext().VoidTy, nullptr, D,
3689 /*isInstance=*/true, /*isVariadic=*/false,
3690 /*isPropertyAccessor=*/true, /*isImplicitlyDeclared=*/true,
3691 /*isDefined=*/false, ObjCMethodDecl::Required);
3692 D->addInstanceMethod(DTORMethod);
3693 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, DTORMethod, false);
3694 D->setHasDestructors(true);
3697 // If the implementation doesn't have any ivar initializers, we don't need
3698 // a .cxx_construct.
3699 if (D->getNumIvarInitializers() == 0 ||
3700 AllTrivialInitializers(*this, D))
3703 IdentifierInfo *II = &getContext().Idents.get(".cxx_construct");
3704 Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
3705 // The constructor returns 'self'.
3706 ObjCMethodDecl *CTORMethod = ObjCMethodDecl::Create(getContext(),
3710 getContext().getObjCIdType(),
3711 nullptr, D, /*isInstance=*/true,
3712 /*isVariadic=*/false,
3713 /*isPropertyAccessor=*/true,
3714 /*isImplicitlyDeclared=*/true,
3715 /*isDefined=*/false,
3716 ObjCMethodDecl::Required);
3717 D->addInstanceMethod(CTORMethod);
3718 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, CTORMethod, true);
3719 D->setHasNonZeroConstructors(true);
3722 // EmitLinkageSpec - Emit all declarations in a linkage spec.
3723 void CodeGenModule::EmitLinkageSpec(const LinkageSpecDecl *LSD) {
3724 if (LSD->getLanguage() != LinkageSpecDecl::lang_c &&
3725 LSD->getLanguage() != LinkageSpecDecl::lang_cxx) {
3726 ErrorUnsupported(LSD, "linkage spec");
3730 EmitDeclContext(LSD);
3733 void CodeGenModule::EmitDeclContext(const DeclContext *DC) {
3734 for (auto *I : DC->decls()) {
3735 // Unlike other DeclContexts, the contents of an ObjCImplDecl at TU scope
3736 // are themselves considered "top-level", so EmitTopLevelDecl on an
3737 // ObjCImplDecl does not recursively visit them. We need to do that in
3738 // case they're nested inside another construct (LinkageSpecDecl /
3739 // ExportDecl) that does stop them from being considered "top-level".
3740 if (auto *OID = dyn_cast<ObjCImplDecl>(I)) {
3741 for (auto *M : OID->methods())
3742 EmitTopLevelDecl(M);
3745 EmitTopLevelDecl(I);
3749 /// EmitTopLevelDecl - Emit code for a single top level declaration.
3750 void CodeGenModule::EmitTopLevelDecl(Decl *D) {
3751 // Ignore dependent declarations.
3752 if (D->getDeclContext() && D->getDeclContext()->isDependentContext())
3755 switch (D->getKind()) {
3756 case Decl::CXXConversion:
3757 case Decl::CXXMethod:
3758 case Decl::Function:
3759 // Skip function templates
3760 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() ||
3761 cast<FunctionDecl>(D)->isLateTemplateParsed())
3764 EmitGlobal(cast<FunctionDecl>(D));
3765 // Always provide some coverage mapping
3766 // even for the functions that aren't emitted.
3767 AddDeferredUnusedCoverageMapping(D);
3771 case Decl::Decomposition:
3772 // Skip variable templates
3773 if (cast<VarDecl>(D)->getDescribedVarTemplate())
3775 case Decl::VarTemplateSpecialization:
3776 EmitGlobal(cast<VarDecl>(D));
3777 if (auto *DD = dyn_cast<DecompositionDecl>(D))
3778 for (auto *B : DD->bindings())
3779 if (auto *HD = B->getHoldingVar())
3783 // Indirect fields from global anonymous structs and unions can be
3784 // ignored; only the actual variable requires IR gen support.
3785 case Decl::IndirectField:
3789 case Decl::Namespace:
3790 EmitDeclContext(cast<NamespaceDecl>(D));
3792 case Decl::CXXRecord:
3793 // Emit any static data members, they may be definitions.
3794 for (auto *I : cast<CXXRecordDecl>(D)->decls())
3795 if (isa<VarDecl>(I) || isa<CXXRecordDecl>(I))
3796 EmitTopLevelDecl(I);
3798 // No code generation needed.
3799 case Decl::UsingShadow:
3800 case Decl::ClassTemplate:
3801 case Decl::VarTemplate:
3802 case Decl::VarTemplatePartialSpecialization:
3803 case Decl::FunctionTemplate:
3804 case Decl::TypeAliasTemplate:
3808 case Decl::Using: // using X; [C++]
3809 if (CGDebugInfo *DI = getModuleDebugInfo())
3810 DI->EmitUsingDecl(cast<UsingDecl>(*D));
3812 case Decl::NamespaceAlias:
3813 if (CGDebugInfo *DI = getModuleDebugInfo())
3814 DI->EmitNamespaceAlias(cast<NamespaceAliasDecl>(*D));
3816 case Decl::UsingDirective: // using namespace X; [C++]
3817 if (CGDebugInfo *DI = getModuleDebugInfo())
3818 DI->EmitUsingDirective(cast<UsingDirectiveDecl>(*D));
3820 case Decl::CXXConstructor:
3821 // Skip function templates
3822 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() ||
3823 cast<FunctionDecl>(D)->isLateTemplateParsed())
3826 getCXXABI().EmitCXXConstructors(cast<CXXConstructorDecl>(D));
3828 case Decl::CXXDestructor:
3829 if (cast<FunctionDecl>(D)->isLateTemplateParsed())
3831 getCXXABI().EmitCXXDestructors(cast<CXXDestructorDecl>(D));
3834 case Decl::StaticAssert:
3838 // Objective-C Decls
3840 // Forward declarations, no (immediate) code generation.
3841 case Decl::ObjCInterface:
3842 case Decl::ObjCCategory:
3845 case Decl::ObjCProtocol: {
3846 auto *Proto = cast<ObjCProtocolDecl>(D);
3847 if (Proto->isThisDeclarationADefinition())
3848 ObjCRuntime->GenerateProtocol(Proto);
3852 case Decl::ObjCCategoryImpl:
3853 // Categories have properties but don't support synthesize so we
3854 // can ignore them here.
3855 ObjCRuntime->GenerateCategory(cast<ObjCCategoryImplDecl>(D));
3858 case Decl::ObjCImplementation: {
3859 auto *OMD = cast<ObjCImplementationDecl>(D);
3860 EmitObjCPropertyImplementations(OMD);
3861 EmitObjCIvarInitializations(OMD);
3862 ObjCRuntime->GenerateClass(OMD);
3863 // Emit global variable debug information.
3864 if (CGDebugInfo *DI = getModuleDebugInfo())
3865 if (getCodeGenOpts().getDebugInfo() >= codegenoptions::LimitedDebugInfo)
3866 DI->getOrCreateInterfaceType(getContext().getObjCInterfaceType(
3867 OMD->getClassInterface()), OMD->getLocation());
3870 case Decl::ObjCMethod: {
3871 auto *OMD = cast<ObjCMethodDecl>(D);
3872 // If this is not a prototype, emit the body.
3874 CodeGenFunction(*this).GenerateObjCMethod(OMD);
3877 case Decl::ObjCCompatibleAlias:
3878 ObjCRuntime->RegisterAlias(cast<ObjCCompatibleAliasDecl>(D));
3881 case Decl::PragmaComment: {
3882 const auto *PCD = cast<PragmaCommentDecl>(D);
3883 switch (PCD->getCommentKind()) {
3885 llvm_unreachable("unexpected pragma comment kind");
3887 AppendLinkerOptions(PCD->getArg());
3890 AddDependentLib(PCD->getArg());
3895 break; // We ignore all of these.
3900 case Decl::PragmaDetectMismatch: {
3901 const auto *PDMD = cast<PragmaDetectMismatchDecl>(D);
3902 AddDetectMismatch(PDMD->getName(), PDMD->getValue());
3906 case Decl::LinkageSpec:
3907 EmitLinkageSpec(cast<LinkageSpecDecl>(D));
3910 case Decl::FileScopeAsm: {
3911 // File-scope asm is ignored during device-side CUDA compilation.
3912 if (LangOpts.CUDA && LangOpts.CUDAIsDevice)
3914 // File-scope asm is ignored during device-side OpenMP compilation.
3915 if (LangOpts.OpenMPIsDevice)
3917 auto *AD = cast<FileScopeAsmDecl>(D);
3918 getModule().appendModuleInlineAsm(AD->getAsmString()->getString());
3922 case Decl::Import: {
3923 auto *Import = cast<ImportDecl>(D);
3925 // If we've already imported this module, we're done.
3926 if (!ImportedModules.insert(Import->getImportedModule()))
3929 // Emit debug information for direct imports.
3930 if (!Import->getImportedOwningModule()) {
3931 if (CGDebugInfo *DI = getModuleDebugInfo())
3932 DI->EmitImportDecl(*Import);
3935 // Find all of the submodules and emit the module initializers.
3936 llvm::SmallPtrSet<clang::Module *, 16> Visited;
3937 SmallVector<clang::Module *, 16> Stack;
3938 Visited.insert(Import->getImportedModule());
3939 Stack.push_back(Import->getImportedModule());
3941 while (!Stack.empty()) {
3942 clang::Module *Mod = Stack.pop_back_val();
3943 if (!EmittedModuleInitializers.insert(Mod).second)
3946 for (auto *D : Context.getModuleInitializers(Mod))
3947 EmitTopLevelDecl(D);
3949 // Visit the submodules of this module.
3950 for (clang::Module::submodule_iterator Sub = Mod->submodule_begin(),
3951 SubEnd = Mod->submodule_end();
3952 Sub != SubEnd; ++Sub) {
3953 // Skip explicit children; they need to be explicitly imported to emit
3954 // the initializers.
3955 if ((*Sub)->IsExplicit)
3958 if (Visited.insert(*Sub).second)
3959 Stack.push_back(*Sub);
3966 EmitDeclContext(cast<ExportDecl>(D));
3969 case Decl::OMPThreadPrivate:
3970 EmitOMPThreadPrivateDecl(cast<OMPThreadPrivateDecl>(D));
3973 case Decl::ClassTemplateSpecialization: {
3974 const auto *Spec = cast<ClassTemplateSpecializationDecl>(D);
3976 Spec->getSpecializationKind() == TSK_ExplicitInstantiationDefinition &&
3977 Spec->hasDefinition())
3978 DebugInfo->completeTemplateDefinition(*Spec);
3982 case Decl::OMPDeclareReduction:
3983 EmitOMPDeclareReduction(cast<OMPDeclareReductionDecl>(D));
3987 // Make sure we handled everything we should, every other kind is a
3988 // non-top-level decl. FIXME: Would be nice to have an isTopLevelDeclKind
3989 // function. Need to recode Decl::Kind to do that easily.
3990 assert(isa<TypeDecl>(D) && "Unsupported decl kind");
3995 void CodeGenModule::AddDeferredUnusedCoverageMapping(Decl *D) {
3996 // Do we need to generate coverage mapping?
3997 if (!CodeGenOpts.CoverageMapping)
3999 switch (D->getKind()) {
4000 case Decl::CXXConversion:
4001 case Decl::CXXMethod:
4002 case Decl::Function:
4003 case Decl::ObjCMethod:
4004 case Decl::CXXConstructor:
4005 case Decl::CXXDestructor: {
4006 if (!cast<FunctionDecl>(D)->doesThisDeclarationHaveABody())
4008 auto I = DeferredEmptyCoverageMappingDecls.find(D);
4009 if (I == DeferredEmptyCoverageMappingDecls.end())
4010 DeferredEmptyCoverageMappingDecls[D] = true;
4018 void CodeGenModule::ClearUnusedCoverageMapping(const Decl *D) {
4019 // Do we need to generate coverage mapping?
4020 if (!CodeGenOpts.CoverageMapping)
4022 if (const auto *Fn = dyn_cast<FunctionDecl>(D)) {
4023 if (Fn->isTemplateInstantiation())
4024 ClearUnusedCoverageMapping(Fn->getTemplateInstantiationPattern());
4026 auto I = DeferredEmptyCoverageMappingDecls.find(D);
4027 if (I == DeferredEmptyCoverageMappingDecls.end())
4028 DeferredEmptyCoverageMappingDecls[D] = false;
4033 void CodeGenModule::EmitDeferredUnusedCoverageMappings() {
4034 std::vector<const Decl *> DeferredDecls;
4035 for (const auto &I : DeferredEmptyCoverageMappingDecls) {
4038 DeferredDecls.push_back(I.first);
4040 // Sort the declarations by their location to make sure that the tests get a
4041 // predictable order for the coverage mapping for the unused declarations.
4042 if (CodeGenOpts.DumpCoverageMapping)
4043 std::sort(DeferredDecls.begin(), DeferredDecls.end(),
4044 [] (const Decl *LHS, const Decl *RHS) {
4045 return LHS->getLocStart() < RHS->getLocStart();
4047 for (const auto *D : DeferredDecls) {
4048 switch (D->getKind()) {
4049 case Decl::CXXConversion:
4050 case Decl::CXXMethod:
4051 case Decl::Function:
4052 case Decl::ObjCMethod: {
4053 CodeGenPGO PGO(*this);
4054 GlobalDecl GD(cast<FunctionDecl>(D));
4055 PGO.emitEmptyCounterMapping(D, getMangledName(GD),
4056 getFunctionLinkage(GD));
4059 case Decl::CXXConstructor: {
4060 CodeGenPGO PGO(*this);
4061 GlobalDecl GD(cast<CXXConstructorDecl>(D), Ctor_Base);
4062 PGO.emitEmptyCounterMapping(D, getMangledName(GD),
4063 getFunctionLinkage(GD));
4066 case Decl::CXXDestructor: {
4067 CodeGenPGO PGO(*this);
4068 GlobalDecl GD(cast<CXXDestructorDecl>(D), Dtor_Base);
4069 PGO.emitEmptyCounterMapping(D, getMangledName(GD),
4070 getFunctionLinkage(GD));
4079 /// Turns the given pointer into a constant.
4080 static llvm::Constant *GetPointerConstant(llvm::LLVMContext &Context,
4082 uintptr_t PtrInt = reinterpret_cast<uintptr_t>(Ptr);
4083 llvm::Type *i64 = llvm::Type::getInt64Ty(Context);
4084 return llvm::ConstantInt::get(i64, PtrInt);
4087 static void EmitGlobalDeclMetadata(CodeGenModule &CGM,
4088 llvm::NamedMDNode *&GlobalMetadata,
4090 llvm::GlobalValue *Addr) {
4091 if (!GlobalMetadata)
4093 CGM.getModule().getOrInsertNamedMetadata("clang.global.decl.ptrs");
4095 // TODO: should we report variant information for ctors/dtors?
4096 llvm::Metadata *Ops[] = {llvm::ConstantAsMetadata::get(Addr),
4097 llvm::ConstantAsMetadata::get(GetPointerConstant(
4098 CGM.getLLVMContext(), D.getDecl()))};
4099 GlobalMetadata->addOperand(llvm::MDNode::get(CGM.getLLVMContext(), Ops));
4102 /// For each function which is declared within an extern "C" region and marked
4103 /// as 'used', but has internal linkage, create an alias from the unmangled
4104 /// name to the mangled name if possible. People expect to be able to refer
4105 /// to such functions with an unmangled name from inline assembly within the
4106 /// same translation unit.
4107 void CodeGenModule::EmitStaticExternCAliases() {
4108 // Don't do anything if we're generating CUDA device code -- the NVPTX
4109 // assembly target doesn't support aliases.
4110 if (Context.getTargetInfo().getTriple().isNVPTX())
4112 for (auto &I : StaticExternCValues) {
4113 IdentifierInfo *Name = I.first;
4114 llvm::GlobalValue *Val = I.second;
4115 if (Val && !getModule().getNamedValue(Name->getName()))
4116 addUsedGlobal(llvm::GlobalAlias::create(Name->getName(), Val));
4120 bool CodeGenModule::lookupRepresentativeDecl(StringRef MangledName,
4121 GlobalDecl &Result) const {
4122 auto Res = Manglings.find(MangledName);
4123 if (Res == Manglings.end())
4125 Result = Res->getValue();
4129 /// Emits metadata nodes associating all the global values in the
4130 /// current module with the Decls they came from. This is useful for
4131 /// projects using IR gen as a subroutine.
4133 /// Since there's currently no way to associate an MDNode directly
4134 /// with an llvm::GlobalValue, we create a global named metadata
4135 /// with the name 'clang.global.decl.ptrs'.
4136 void CodeGenModule::EmitDeclMetadata() {
4137 llvm::NamedMDNode *GlobalMetadata = nullptr;
4139 for (auto &I : MangledDeclNames) {
4140 llvm::GlobalValue *Addr = getModule().getNamedValue(I.second);
4141 // Some mangled names don't necessarily have an associated GlobalValue
4142 // in this module, e.g. if we mangled it for DebugInfo.
4144 EmitGlobalDeclMetadata(*this, GlobalMetadata, I.first, Addr);
4148 /// Emits metadata nodes for all the local variables in the current
4150 void CodeGenFunction::EmitDeclMetadata() {
4151 if (LocalDeclMap.empty()) return;
4153 llvm::LLVMContext &Context = getLLVMContext();
4155 // Find the unique metadata ID for this name.
4156 unsigned DeclPtrKind = Context.getMDKindID("clang.decl.ptr");
4158 llvm::NamedMDNode *GlobalMetadata = nullptr;
4160 for (auto &I : LocalDeclMap) {
4161 const Decl *D = I.first;
4162 llvm::Value *Addr = I.second.getPointer();
4163 if (auto *Alloca = dyn_cast<llvm::AllocaInst>(Addr)) {
4164 llvm::Value *DAddr = GetPointerConstant(getLLVMContext(), D);
4165 Alloca->setMetadata(
4166 DeclPtrKind, llvm::MDNode::get(
4167 Context, llvm::ValueAsMetadata::getConstant(DAddr)));
4168 } else if (auto *GV = dyn_cast<llvm::GlobalValue>(Addr)) {
4169 GlobalDecl GD = GlobalDecl(cast<VarDecl>(D));
4170 EmitGlobalDeclMetadata(CGM, GlobalMetadata, GD, GV);
4175 void CodeGenModule::EmitVersionIdentMetadata() {
4176 llvm::NamedMDNode *IdentMetadata =
4177 TheModule.getOrInsertNamedMetadata("llvm.ident");
4178 std::string Version = getClangFullVersion();
4179 llvm::LLVMContext &Ctx = TheModule.getContext();
4181 llvm::Metadata *IdentNode[] = {llvm::MDString::get(Ctx, Version)};
4182 IdentMetadata->addOperand(llvm::MDNode::get(Ctx, IdentNode));
4185 void CodeGenModule::EmitTargetMetadata() {
4186 // Warning, new MangledDeclNames may be appended within this loop.
4187 // We rely on MapVector insertions adding new elements to the end
4188 // of the container.
4189 // FIXME: Move this loop into the one target that needs it, and only
4190 // loop over those declarations for which we couldn't emit the target
4191 // metadata when we emitted the declaration.
4192 for (unsigned I = 0; I != MangledDeclNames.size(); ++I) {
4193 auto Val = *(MangledDeclNames.begin() + I);
4194 const Decl *D = Val.first.getDecl()->getMostRecentDecl();
4195 llvm::GlobalValue *GV = GetGlobalValue(Val.second);
4196 getTargetCodeGenInfo().emitTargetMD(D, GV, *this);
4200 void CodeGenModule::EmitCoverageFile() {
4201 if (getCodeGenOpts().CoverageDataFile.empty() &&
4202 getCodeGenOpts().CoverageNotesFile.empty())
4205 llvm::NamedMDNode *CUNode = TheModule.getNamedMetadata("llvm.dbg.cu");
4209 llvm::NamedMDNode *GCov = TheModule.getOrInsertNamedMetadata("llvm.gcov");
4210 llvm::LLVMContext &Ctx = TheModule.getContext();
4211 auto *CoverageDataFile =
4212 llvm::MDString::get(Ctx, getCodeGenOpts().CoverageDataFile);
4213 auto *CoverageNotesFile =
4214 llvm::MDString::get(Ctx, getCodeGenOpts().CoverageNotesFile);
4215 for (int i = 0, e = CUNode->getNumOperands(); i != e; ++i) {
4216 llvm::MDNode *CU = CUNode->getOperand(i);
4217 llvm::Metadata *Elts[] = {CoverageNotesFile, CoverageDataFile, CU};
4218 GCov->addOperand(llvm::MDNode::get(Ctx, Elts));
4222 llvm::Constant *CodeGenModule::EmitUuidofInitializer(StringRef Uuid) {
4223 // Sema has checked that all uuid strings are of the form
4224 // "12345678-1234-1234-1234-1234567890ab".
4225 assert(Uuid.size() == 36);
4226 for (unsigned i = 0; i < 36; ++i) {
4227 if (i == 8 || i == 13 || i == 18 || i == 23) assert(Uuid[i] == '-');
4228 else assert(isHexDigit(Uuid[i]));
4231 // The starts of all bytes of Field3 in Uuid. Field 3 is "1234-1234567890ab".
4232 const unsigned Field3ValueOffsets[8] = { 19, 21, 24, 26, 28, 30, 32, 34 };
4234 llvm::Constant *Field3[8];
4235 for (unsigned Idx = 0; Idx < 8; ++Idx)
4236 Field3[Idx] = llvm::ConstantInt::get(
4237 Int8Ty, Uuid.substr(Field3ValueOffsets[Idx], 2), 16);
4239 llvm::Constant *Fields[4] = {
4240 llvm::ConstantInt::get(Int32Ty, Uuid.substr(0, 8), 16),
4241 llvm::ConstantInt::get(Int16Ty, Uuid.substr(9, 4), 16),
4242 llvm::ConstantInt::get(Int16Ty, Uuid.substr(14, 4), 16),
4243 llvm::ConstantArray::get(llvm::ArrayType::get(Int8Ty, 8), Field3)
4246 return llvm::ConstantStruct::getAnon(Fields);
4249 llvm::Constant *CodeGenModule::GetAddrOfRTTIDescriptor(QualType Ty,
4251 // Return a bogus pointer if RTTI is disabled, unless it's for EH.
4252 // FIXME: should we even be calling this method if RTTI is disabled
4253 // and it's not for EH?
4254 if (!ForEH && !getLangOpts().RTTI)
4255 return llvm::Constant::getNullValue(Int8PtrTy);
4257 if (ForEH && Ty->isObjCObjectPointerType() &&
4258 LangOpts.ObjCRuntime.isGNUFamily())
4259 return ObjCRuntime->GetEHType(Ty);
4261 return getCXXABI().getAddrOfRTTIDescriptor(Ty);
4264 void CodeGenModule::EmitOMPThreadPrivateDecl(const OMPThreadPrivateDecl *D) {
4265 for (auto RefExpr : D->varlists()) {
4266 auto *VD = cast<VarDecl>(cast<DeclRefExpr>(RefExpr)->getDecl());
4268 VD->getAnyInitializer() &&
4269 !VD->getAnyInitializer()->isConstantInitializer(getContext(),
4272 Address Addr(GetAddrOfGlobalVar(VD), getContext().getDeclAlign(VD));
4273 if (auto InitFunction = getOpenMPRuntime().emitThreadPrivateVarDefinition(
4274 VD, Addr, RefExpr->getLocStart(), PerformInit))
4275 CXXGlobalInits.push_back(InitFunction);
4279 llvm::Metadata *CodeGenModule::CreateMetadataIdentifierForType(QualType T) {
4280 llvm::Metadata *&InternalId = MetadataIdMap[T.getCanonicalType()];
4284 if (isExternallyVisible(T->getLinkage())) {
4285 std::string OutName;
4286 llvm::raw_string_ostream Out(OutName);
4287 getCXXABI().getMangleContext().mangleTypeName(T, Out);
4289 InternalId = llvm::MDString::get(getLLVMContext(), Out.str());
4291 InternalId = llvm::MDNode::getDistinct(getLLVMContext(),
4292 llvm::ArrayRef<llvm::Metadata *>());
4298 /// Returns whether this module needs the "all-vtables" type identifier.
4299 bool CodeGenModule::NeedAllVtablesTypeId() const {
4300 // Returns true if at least one of vtable-based CFI checkers is enabled and
4301 // is not in the trapping mode.
4302 return ((LangOpts.Sanitize.has(SanitizerKind::CFIVCall) &&
4303 !CodeGenOpts.SanitizeTrap.has(SanitizerKind::CFIVCall)) ||
4304 (LangOpts.Sanitize.has(SanitizerKind::CFINVCall) &&
4305 !CodeGenOpts.SanitizeTrap.has(SanitizerKind::CFINVCall)) ||
4306 (LangOpts.Sanitize.has(SanitizerKind::CFIDerivedCast) &&
4307 !CodeGenOpts.SanitizeTrap.has(SanitizerKind::CFIDerivedCast)) ||
4308 (LangOpts.Sanitize.has(SanitizerKind::CFIUnrelatedCast) &&
4309 !CodeGenOpts.SanitizeTrap.has(SanitizerKind::CFIUnrelatedCast)));
4312 void CodeGenModule::AddVTableTypeMetadata(llvm::GlobalVariable *VTable,
4314 const CXXRecordDecl *RD) {
4315 llvm::Metadata *MD =
4316 CreateMetadataIdentifierForType(QualType(RD->getTypeForDecl(), 0));
4317 VTable->addTypeMetadata(Offset.getQuantity(), MD);
4319 if (CodeGenOpts.SanitizeCfiCrossDso)
4320 if (auto CrossDsoTypeId = CreateCrossDsoCfiTypeId(MD))
4321 VTable->addTypeMetadata(Offset.getQuantity(),
4322 llvm::ConstantAsMetadata::get(CrossDsoTypeId));
4324 if (NeedAllVtablesTypeId()) {
4325 llvm::Metadata *MD = llvm::MDString::get(getLLVMContext(), "all-vtables");
4326 VTable->addTypeMetadata(Offset.getQuantity(), MD);
4330 // Fills in the supplied string map with the set of target features for the
4331 // passed in function.
4332 void CodeGenModule::getFunctionFeatureMap(llvm::StringMap<bool> &FeatureMap,
4333 const FunctionDecl *FD) {
4334 StringRef TargetCPU = Target.getTargetOpts().CPU;
4335 if (const auto *TD = FD->getAttr<TargetAttr>()) {
4336 // If we have a TargetAttr build up the feature map based on that.
4337 TargetAttr::ParsedTargetAttr ParsedAttr = TD->parse();
4339 // Make a copy of the features as passed on the command line into the
4340 // beginning of the additional features from the function to override.
4341 ParsedAttr.first.insert(ParsedAttr.first.begin(),
4342 Target.getTargetOpts().FeaturesAsWritten.begin(),
4343 Target.getTargetOpts().FeaturesAsWritten.end());
4345 if (ParsedAttr.second != "")
4346 TargetCPU = ParsedAttr.second;
4348 // Now populate the feature map, first with the TargetCPU which is either
4349 // the default or a new one from the target attribute string. Then we'll use
4350 // the passed in features (FeaturesAsWritten) along with the new ones from
4352 Target.initFeatureMap(FeatureMap, getDiags(), TargetCPU, ParsedAttr.first);
4354 Target.initFeatureMap(FeatureMap, getDiags(), TargetCPU,
4355 Target.getTargetOpts().Features);
4359 llvm::SanitizerStatReport &CodeGenModule::getSanStats() {
4361 SanStats = llvm::make_unique<llvm::SanitizerStatReport>(&getModule());
4366 CodeGenModule::createOpenCLIntToSamplerConversion(const Expr *E,
4367 CodeGenFunction &CGF) {
4368 llvm::Constant *C = EmitConstantExpr(E, E->getType(), &CGF);
4369 auto SamplerT = getOpenCLRuntime().getSamplerType();
4370 auto FTy = llvm::FunctionType::get(SamplerT, {C->getType()}, false);
4371 return CGF.Builder.CreateCall(CreateRuntimeFunction(FTy,
4372 "__translate_sampler_initializer"),