clang  5.0.0
CodeGenModule.cpp
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1 //===--- CodeGenModule.cpp - Emit LLVM Code from ASTs for a Module --------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This coordinates the per-module state used while generating code.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "CodeGenModule.h"
15 #include "CGBlocks.h"
16 #include "CGCUDARuntime.h"
17 #include "CGCXXABI.h"
18 #include "CGCall.h"
19 #include "CGDebugInfo.h"
20 #include "CGObjCRuntime.h"
21 #include "CGOpenCLRuntime.h"
22 #include "CGOpenMPRuntime.h"
23 #include "CGOpenMPRuntimeNVPTX.h"
24 #include "CodeGenFunction.h"
25 #include "CodeGenPGO.h"
26 #include "CodeGenTBAA.h"
27 #include "CoverageMappingGen.h"
28 #include "TargetInfo.h"
29 #include "clang/AST/ASTContext.h"
30 #include "clang/AST/CharUnits.h"
31 #include "clang/AST/DeclCXX.h"
32 #include "clang/AST/DeclObjC.h"
33 #include "clang/AST/DeclTemplate.h"
34 #include "clang/AST/Mangle.h"
35 #include "clang/AST/RecordLayout.h"
37 #include "clang/Basic/Builtins.h"
38 #include "clang/Basic/CharInfo.h"
39 #include "clang/Basic/Diagnostic.h"
40 #include "clang/Basic/Module.h"
42 #include "clang/Basic/TargetInfo.h"
43 #include "clang/Basic/Version.h"
47 #include "llvm/ADT/Triple.h"
48 #include "llvm/Analysis/TargetLibraryInfo.h"
49 #include "llvm/IR/CallSite.h"
50 #include "llvm/IR/CallingConv.h"
51 #include "llvm/IR/DataLayout.h"
52 #include "llvm/IR/Intrinsics.h"
53 #include "llvm/IR/LLVMContext.h"
54 #include "llvm/IR/Module.h"
55 #include "llvm/ProfileData/InstrProfReader.h"
56 #include "llvm/Support/ConvertUTF.h"
57 #include "llvm/Support/ErrorHandling.h"
58 #include "llvm/Support/MD5.h"
59 
60 using namespace clang;
61 using namespace CodeGen;
62 
63 static const char AnnotationSection[] = "llvm.metadata";
64 
66  switch (CGM.getTarget().getCXXABI().getKind()) {
69  case TargetCXXABI::iOS:
75  return CreateItaniumCXXABI(CGM);
77  return CreateMicrosoftCXXABI(CGM);
78  }
79 
80  llvm_unreachable("invalid C++ ABI kind");
81 }
82 
83 CodeGenModule::CodeGenModule(ASTContext &C, const HeaderSearchOptions &HSO,
84  const PreprocessorOptions &PPO,
85  const CodeGenOptions &CGO, llvm::Module &M,
86  DiagnosticsEngine &diags,
87  CoverageSourceInfo *CoverageInfo)
88  : Context(C), LangOpts(C.getLangOpts()), HeaderSearchOpts(HSO),
89  PreprocessorOpts(PPO), CodeGenOpts(CGO), TheModule(M), Diags(diags),
90  Target(C.getTargetInfo()), ABI(createCXXABI(*this)),
91  VMContext(M.getContext()), Types(*this), VTables(*this),
92  SanitizerMD(new SanitizerMetadata(*this)) {
93 
94  // Initialize the type cache.
95  llvm::LLVMContext &LLVMContext = M.getContext();
96  VoidTy = llvm::Type::getVoidTy(LLVMContext);
97  Int8Ty = llvm::Type::getInt8Ty(LLVMContext);
98  Int16Ty = llvm::Type::getInt16Ty(LLVMContext);
99  Int32Ty = llvm::Type::getInt32Ty(LLVMContext);
100  Int64Ty = llvm::Type::getInt64Ty(LLVMContext);
101  FloatTy = llvm::Type::getFloatTy(LLVMContext);
102  DoubleTy = llvm::Type::getDoubleTy(LLVMContext);
105  C.toCharUnitsFromBits(C.getTargetInfo().getPointerAlign(0)).getQuantity();
109  C.toCharUnitsFromBits(C.getTargetInfo().getIntAlign()).getQuantity();
110  IntTy = llvm::IntegerType::get(LLVMContext, C.getTargetInfo().getIntWidth());
111  IntPtrTy = llvm::IntegerType::get(LLVMContext,
113  Int8PtrTy = Int8Ty->getPointerTo(0);
114  Int8PtrPtrTy = Int8PtrTy->getPointerTo(0);
115  AllocaInt8PtrTy = Int8Ty->getPointerTo(
116  M.getDataLayout().getAllocaAddrSpace());
118 
121 
122  if (LangOpts.ObjC1)
123  createObjCRuntime();
124  if (LangOpts.OpenCL)
125  createOpenCLRuntime();
126  if (LangOpts.OpenMP)
127  createOpenMPRuntime();
128  if (LangOpts.CUDA)
129  createCUDARuntime();
130 
131  // Enable TBAA unless it's suppressed. ThreadSanitizer needs TBAA even at O0.
132  if (LangOpts.Sanitize.has(SanitizerKind::Thread) ||
133  (!CodeGenOpts.RelaxedAliasing && CodeGenOpts.OptimizationLevel > 0))
134  TBAA.reset(new CodeGenTBAA(Context, VMContext, CodeGenOpts, getLangOpts(),
135  getCXXABI().getMangleContext()));
136 
137  // If debug info or coverage generation is enabled, create the CGDebugInfo
138  // object.
139  if (CodeGenOpts.getDebugInfo() != codegenoptions::NoDebugInfo ||
140  CodeGenOpts.EmitGcovArcs || CodeGenOpts.EmitGcovNotes)
141  DebugInfo.reset(new CGDebugInfo(*this));
142 
143  Block.GlobalUniqueCount = 0;
144 
145  if (C.getLangOpts().ObjC1)
146  ObjCData.reset(new ObjCEntrypoints());
147 
148  if (CodeGenOpts.hasProfileClangUse()) {
149  auto ReaderOrErr = llvm::IndexedInstrProfReader::create(
150  CodeGenOpts.ProfileInstrumentUsePath);
151  if (auto E = ReaderOrErr.takeError()) {
152  unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
153  "Could not read profile %0: %1");
154  llvm::handleAllErrors(std::move(E), [&](const llvm::ErrorInfoBase &EI) {
155  getDiags().Report(DiagID) << CodeGenOpts.ProfileInstrumentUsePath
156  << EI.message();
157  });
158  } else
159  PGOReader = std::move(ReaderOrErr.get());
160  }
161 
162  // If coverage mapping generation is enabled, create the
163  // CoverageMappingModuleGen object.
164  if (CodeGenOpts.CoverageMapping)
165  CoverageMapping.reset(new CoverageMappingModuleGen(*this, *CoverageInfo));
166 }
167 
169 
170 void CodeGenModule::createObjCRuntime() {
171  // This is just isGNUFamily(), but we want to force implementors of
172  // new ABIs to decide how best to do this.
173  switch (LangOpts.ObjCRuntime.getKind()) {
175  case ObjCRuntime::GCC:
176  case ObjCRuntime::ObjFW:
177  ObjCRuntime.reset(CreateGNUObjCRuntime(*this));
178  return;
179 
181  case ObjCRuntime::MacOSX:
182  case ObjCRuntime::iOS:
184  ObjCRuntime.reset(CreateMacObjCRuntime(*this));
185  return;
186  }
187  llvm_unreachable("bad runtime kind");
188 }
189 
190 void CodeGenModule::createOpenCLRuntime() {
191  OpenCLRuntime.reset(new CGOpenCLRuntime(*this));
192 }
193 
194 void CodeGenModule::createOpenMPRuntime() {
195  // Select a specialized code generation class based on the target, if any.
196  // If it does not exist use the default implementation.
197  switch (getTriple().getArch()) {
198  case llvm::Triple::nvptx:
199  case llvm::Triple::nvptx64:
200  assert(getLangOpts().OpenMPIsDevice &&
201  "OpenMP NVPTX is only prepared to deal with device code.");
202  OpenMPRuntime.reset(new CGOpenMPRuntimeNVPTX(*this));
203  break;
204  default:
205  OpenMPRuntime.reset(new CGOpenMPRuntime(*this));
206  break;
207  }
208 }
209 
210 void CodeGenModule::createCUDARuntime() {
211  CUDARuntime.reset(CreateNVCUDARuntime(*this));
212 }
213 
214 void CodeGenModule::addReplacement(StringRef Name, llvm::Constant *C) {
215  Replacements[Name] = C;
216 }
217 
218 void CodeGenModule::applyReplacements() {
219  for (auto &I : Replacements) {
220  StringRef MangledName = I.first();
221  llvm::Constant *Replacement = I.second;
222  llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
223  if (!Entry)
224  continue;
225  auto *OldF = cast<llvm::Function>(Entry);
226  auto *NewF = dyn_cast<llvm::Function>(Replacement);
227  if (!NewF) {
228  if (auto *Alias = dyn_cast<llvm::GlobalAlias>(Replacement)) {
229  NewF = dyn_cast<llvm::Function>(Alias->getAliasee());
230  } else {
231  auto *CE = cast<llvm::ConstantExpr>(Replacement);
232  assert(CE->getOpcode() == llvm::Instruction::BitCast ||
233  CE->getOpcode() == llvm::Instruction::GetElementPtr);
234  NewF = dyn_cast<llvm::Function>(CE->getOperand(0));
235  }
236  }
237 
238  // Replace old with new, but keep the old order.
239  OldF->replaceAllUsesWith(Replacement);
240  if (NewF) {
241  NewF->removeFromParent();
242  OldF->getParent()->getFunctionList().insertAfter(OldF->getIterator(),
243  NewF);
244  }
245  OldF->eraseFromParent();
246  }
247 }
248 
249 void CodeGenModule::addGlobalValReplacement(llvm::GlobalValue *GV, llvm::Constant *C) {
250  GlobalValReplacements.push_back(std::make_pair(GV, C));
251 }
252 
253 void CodeGenModule::applyGlobalValReplacements() {
254  for (auto &I : GlobalValReplacements) {
255  llvm::GlobalValue *GV = I.first;
256  llvm::Constant *C = I.second;
257 
258  GV->replaceAllUsesWith(C);
259  GV->eraseFromParent();
260  }
261 }
262 
263 // This is only used in aliases that we created and we know they have a
264 // linear structure.
265 static const llvm::GlobalObject *getAliasedGlobal(
266  const llvm::GlobalIndirectSymbol &GIS) {
267  llvm::SmallPtrSet<const llvm::GlobalIndirectSymbol*, 4> Visited;
268  const llvm::Constant *C = &GIS;
269  for (;;) {
270  C = C->stripPointerCasts();
271  if (auto *GO = dyn_cast<llvm::GlobalObject>(C))
272  return GO;
273  // stripPointerCasts will not walk over weak aliases.
274  auto *GIS2 = dyn_cast<llvm::GlobalIndirectSymbol>(C);
275  if (!GIS2)
276  return nullptr;
277  if (!Visited.insert(GIS2).second)
278  return nullptr;
279  C = GIS2->getIndirectSymbol();
280  }
281 }
282 
283 void CodeGenModule::checkAliases() {
284  // Check if the constructed aliases are well formed. It is really unfortunate
285  // that we have to do this in CodeGen, but we only construct mangled names
286  // and aliases during codegen.
287  bool Error = false;
288  DiagnosticsEngine &Diags = getDiags();
289  for (const GlobalDecl &GD : Aliases) {
290  const auto *D = cast<ValueDecl>(GD.getDecl());
291  SourceLocation Location;
292  bool IsIFunc = D->hasAttr<IFuncAttr>();
293  if (const Attr *A = D->getDefiningAttr())
294  Location = A->getLocation();
295  else
296  llvm_unreachable("Not an alias or ifunc?");
297  StringRef MangledName = getMangledName(GD);
298  llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
299  auto *Alias = cast<llvm::GlobalIndirectSymbol>(Entry);
300  const llvm::GlobalValue *GV = getAliasedGlobal(*Alias);
301  if (!GV) {
302  Error = true;
303  Diags.Report(Location, diag::err_cyclic_alias) << IsIFunc;
304  } else if (GV->isDeclaration()) {
305  Error = true;
306  Diags.Report(Location, diag::err_alias_to_undefined)
307  << IsIFunc << IsIFunc;
308  } else if (IsIFunc) {
309  // Check resolver function type.
310  llvm::FunctionType *FTy = dyn_cast<llvm::FunctionType>(
311  GV->getType()->getPointerElementType());
312  assert(FTy);
313  if (!FTy->getReturnType()->isPointerTy())
314  Diags.Report(Location, diag::err_ifunc_resolver_return);
315  if (FTy->getNumParams())
316  Diags.Report(Location, diag::err_ifunc_resolver_params);
317  }
318 
319  llvm::Constant *Aliasee = Alias->getIndirectSymbol();
320  llvm::GlobalValue *AliaseeGV;
321  if (auto CE = dyn_cast<llvm::ConstantExpr>(Aliasee))
322  AliaseeGV = cast<llvm::GlobalValue>(CE->getOperand(0));
323  else
324  AliaseeGV = cast<llvm::GlobalValue>(Aliasee);
325 
326  if (const SectionAttr *SA = D->getAttr<SectionAttr>()) {
327  StringRef AliasSection = SA->getName();
328  if (AliasSection != AliaseeGV->getSection())
329  Diags.Report(SA->getLocation(), diag::warn_alias_with_section)
330  << AliasSection << IsIFunc << IsIFunc;
331  }
332 
333  // We have to handle alias to weak aliases in here. LLVM itself disallows
334  // this since the object semantics would not match the IL one. For
335  // compatibility with gcc we implement it by just pointing the alias
336  // to its aliasee's aliasee. We also warn, since the user is probably
337  // expecting the link to be weak.
338  if (auto GA = dyn_cast<llvm::GlobalIndirectSymbol>(AliaseeGV)) {
339  if (GA->isInterposable()) {
340  Diags.Report(Location, diag::warn_alias_to_weak_alias)
341  << GV->getName() << GA->getName() << IsIFunc;
342  Aliasee = llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(
343  GA->getIndirectSymbol(), Alias->getType());
344  Alias->setIndirectSymbol(Aliasee);
345  }
346  }
347  }
348  if (!Error)
349  return;
350 
351  for (const GlobalDecl &GD : Aliases) {
352  StringRef MangledName = getMangledName(GD);
353  llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
354  auto *Alias = dyn_cast<llvm::GlobalIndirectSymbol>(Entry);
355  Alias->replaceAllUsesWith(llvm::UndefValue::get(Alias->getType()));
356  Alias->eraseFromParent();
357  }
358 }
359 
361  DeferredDeclsToEmit.clear();
362  if (OpenMPRuntime)
363  OpenMPRuntime->clear();
364 }
365 
367  StringRef MainFile) {
368  if (!hasDiagnostics())
369  return;
370  if (VisitedInMainFile > 0 && VisitedInMainFile == MissingInMainFile) {
371  if (MainFile.empty())
372  MainFile = "<stdin>";
373  Diags.Report(diag::warn_profile_data_unprofiled) << MainFile;
374  } else {
375  if (Mismatched > 0)
376  Diags.Report(diag::warn_profile_data_out_of_date) << Visited << Mismatched;
377 
378  if (Missing > 0)
379  Diags.Report(diag::warn_profile_data_missing) << Visited << Missing;
380  }
381 }
382 
384  EmitDeferred();
385  EmitVTablesOpportunistically();
386  applyGlobalValReplacements();
387  applyReplacements();
388  checkAliases();
389  EmitCXXGlobalInitFunc();
390  EmitCXXGlobalDtorFunc();
391  EmitCXXThreadLocalInitFunc();
392  if (ObjCRuntime)
393  if (llvm::Function *ObjCInitFunction = ObjCRuntime->ModuleInitFunction())
394  AddGlobalCtor(ObjCInitFunction);
395  if (Context.getLangOpts().CUDA && !Context.getLangOpts().CUDAIsDevice &&
396  CUDARuntime) {
397  if (llvm::Function *CudaCtorFunction = CUDARuntime->makeModuleCtorFunction())
398  AddGlobalCtor(CudaCtorFunction);
399  if (llvm::Function *CudaDtorFunction = CUDARuntime->makeModuleDtorFunction())
400  AddGlobalDtor(CudaDtorFunction);
401  }
402  if (OpenMPRuntime)
403  if (llvm::Function *OpenMPRegistrationFunction =
404  OpenMPRuntime->emitRegistrationFunction()) {
405  auto ComdatKey = OpenMPRegistrationFunction->hasComdat() ?
406  OpenMPRegistrationFunction : nullptr;
407  AddGlobalCtor(OpenMPRegistrationFunction, 0, ComdatKey);
408  }
409  if (PGOReader) {
410  getModule().setProfileSummary(PGOReader->getSummary().getMD(VMContext));
411  if (PGOStats.hasDiagnostics())
412  PGOStats.reportDiagnostics(getDiags(), getCodeGenOpts().MainFileName);
413  }
414  EmitCtorList(GlobalCtors, "llvm.global_ctors");
415  EmitCtorList(GlobalDtors, "llvm.global_dtors");
417  EmitStaticExternCAliases();
419  if (CoverageMapping)
420  CoverageMapping->emit();
421  if (CodeGenOpts.SanitizeCfiCrossDso) {
424  }
425  emitAtAvailableLinkGuard();
426  emitLLVMUsed();
427  if (SanStats)
428  SanStats->finish();
429 
430  if (CodeGenOpts.Autolink &&
431  (Context.getLangOpts().Modules || !LinkerOptionsMetadata.empty())) {
432  EmitModuleLinkOptions();
433  }
434 
435  // Record mregparm value now so it is visible through rest of codegen.
436  if (Context.getTargetInfo().getTriple().getArch() == llvm::Triple::x86)
437  getModule().addModuleFlag(llvm::Module::Error, "NumRegisterParameters",
438  CodeGenOpts.NumRegisterParameters);
439 
440  if (CodeGenOpts.DwarfVersion) {
441  // We actually want the latest version when there are conflicts.
442  // We can change from Warning to Latest if such mode is supported.
443  getModule().addModuleFlag(llvm::Module::Warning, "Dwarf Version",
444  CodeGenOpts.DwarfVersion);
445  }
446  if (CodeGenOpts.EmitCodeView) {
447  // Indicate that we want CodeView in the metadata.
448  getModule().addModuleFlag(llvm::Module::Warning, "CodeView", 1);
449  }
450  if (CodeGenOpts.OptimizationLevel > 0 && CodeGenOpts.StrictVTablePointers) {
451  // We don't support LTO with 2 with different StrictVTablePointers
452  // FIXME: we could support it by stripping all the information introduced
453  // by StrictVTablePointers.
454 
455  getModule().addModuleFlag(llvm::Module::Error, "StrictVTablePointers",1);
456 
457  llvm::Metadata *Ops[2] = {
458  llvm::MDString::get(VMContext, "StrictVTablePointers"),
459  llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
460  llvm::Type::getInt32Ty(VMContext), 1))};
461 
462  getModule().addModuleFlag(llvm::Module::Require,
463  "StrictVTablePointersRequirement",
464  llvm::MDNode::get(VMContext, Ops));
465  }
466  if (DebugInfo)
467  // We support a single version in the linked module. The LLVM
468  // parser will drop debug info with a different version number
469  // (and warn about it, too).
470  getModule().addModuleFlag(llvm::Module::Warning, "Debug Info Version",
471  llvm::DEBUG_METADATA_VERSION);
472 
473  // Width of wchar_t in bytes
474  uint64_t WCharWidth =
475  Context.getTypeSizeInChars(Context.getWideCharType()).getQuantity();
476  assert((LangOpts.ShortWChar ||
477  llvm::TargetLibraryInfoImpl::getTargetWCharSize(Target.getTriple()) ==
478  Target.getWCharWidth() / 8) &&
479  "LLVM wchar_t size out of sync");
480 
481  // We need to record the widths of enums and wchar_t, so that we can generate
482  // the correct build attributes in the ARM backend. wchar_size is also used by
483  // TargetLibraryInfo.
484  getModule().addModuleFlag(llvm::Module::Error, "wchar_size", WCharWidth);
485 
486  llvm::Triple::ArchType Arch = Context.getTargetInfo().getTriple().getArch();
487  if ( Arch == llvm::Triple::arm
488  || Arch == llvm::Triple::armeb
489  || Arch == llvm::Triple::thumb
490  || Arch == llvm::Triple::thumbeb) {
491  // The minimum width of an enum in bytes
492  uint64_t EnumWidth = Context.getLangOpts().ShortEnums ? 1 : 4;
493  getModule().addModuleFlag(llvm::Module::Error, "min_enum_size", EnumWidth);
494  }
495 
496  if (CodeGenOpts.SanitizeCfiCrossDso) {
497  // Indicate that we want cross-DSO control flow integrity checks.
498  getModule().addModuleFlag(llvm::Module::Override, "Cross-DSO CFI", 1);
499  }
500 
501  if (LangOpts.CUDAIsDevice && getTriple().isNVPTX()) {
502  // Indicate whether __nvvm_reflect should be configured to flush denormal
503  // floating point values to 0. (This corresponds to its "__CUDA_FTZ"
504  // property.)
505  getModule().addModuleFlag(llvm::Module::Override, "nvvm-reflect-ftz",
506  LangOpts.CUDADeviceFlushDenormalsToZero ? 1 : 0);
507  }
508 
509  // Emit OpenCL specific module metadata: OpenCL/SPIR version.
510  if (LangOpts.OpenCL) {
511  EmitOpenCLMetadata();
512  // Emit SPIR version.
513  if (getTriple().getArch() == llvm::Triple::spir ||
514  getTriple().getArch() == llvm::Triple::spir64) {
515  // SPIR v2.0 s2.12 - The SPIR version used by the module is stored in the
516  // opencl.spir.version named metadata.
517  llvm::Metadata *SPIRVerElts[] = {
518  llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
519  Int32Ty, LangOpts.OpenCLVersion / 100)),
520  llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
521  Int32Ty, (LangOpts.OpenCLVersion / 100 > 1) ? 0 : 2))};
522  llvm::NamedMDNode *SPIRVerMD =
523  TheModule.getOrInsertNamedMetadata("opencl.spir.version");
524  llvm::LLVMContext &Ctx = TheModule.getContext();
525  SPIRVerMD->addOperand(llvm::MDNode::get(Ctx, SPIRVerElts));
526  }
527  }
528 
529  if (uint32_t PLevel = Context.getLangOpts().PICLevel) {
530  assert(PLevel < 3 && "Invalid PIC Level");
531  getModule().setPICLevel(static_cast<llvm::PICLevel::Level>(PLevel));
532  if (Context.getLangOpts().PIE)
533  getModule().setPIELevel(static_cast<llvm::PIELevel::Level>(PLevel));
534  }
535 
536  SimplifyPersonality();
537 
538  if (getCodeGenOpts().EmitDeclMetadata)
539  EmitDeclMetadata();
540 
541  if (getCodeGenOpts().EmitGcovArcs || getCodeGenOpts().EmitGcovNotes)
542  EmitCoverageFile();
543 
544  if (DebugInfo)
545  DebugInfo->finalize();
546 
547  EmitVersionIdentMetadata();
548 
549  EmitTargetMetadata();
550 }
551 
552 void CodeGenModule::EmitOpenCLMetadata() {
553  // SPIR v2.0 s2.13 - The OpenCL version used by the module is stored in the
554  // opencl.ocl.version named metadata node.
555  llvm::Metadata *OCLVerElts[] = {
556  llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
557  Int32Ty, LangOpts.OpenCLVersion / 100)),
558  llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
559  Int32Ty, (LangOpts.OpenCLVersion % 100) / 10))};
560  llvm::NamedMDNode *OCLVerMD =
561  TheModule.getOrInsertNamedMetadata("opencl.ocl.version");
562  llvm::LLVMContext &Ctx = TheModule.getContext();
563  OCLVerMD->addOperand(llvm::MDNode::get(Ctx, OCLVerElts));
564 }
565 
567  // Make sure that this type is translated.
568  Types.UpdateCompletedType(TD);
569 }
570 
572  // Make sure that this type is translated.
573  Types.RefreshTypeCacheForClass(RD);
574 }
575 
577  if (!TBAA)
578  return nullptr;
579  return TBAA->getTBAAInfo(QTy);
580 }
581 
583  if (!TBAA)
584  return nullptr;
585  return TBAA->getTBAAInfoForVTablePtr();
586 }
587 
589  if (!TBAA)
590  return nullptr;
591  return TBAA->getTBAAStructInfo(QTy);
592 }
593 
595  llvm::MDNode *AccessN,
596  uint64_t O) {
597  if (!TBAA)
598  return nullptr;
599  return TBAA->getTBAAStructTagInfo(BaseTy, AccessN, O);
600 }
601 
602 /// Decorate the instruction with a TBAA tag. For both scalar TBAA
603 /// and struct-path aware TBAA, the tag has the same format:
604 /// base type, access type and offset.
605 /// When ConvertTypeToTag is true, we create a tag based on the scalar type.
606 void CodeGenModule::DecorateInstructionWithTBAA(llvm::Instruction *Inst,
607  llvm::MDNode *TBAAInfo,
608  bool ConvertTypeToTag) {
609  if (ConvertTypeToTag && TBAA)
610  Inst->setMetadata(llvm::LLVMContext::MD_tbaa,
611  TBAA->getTBAAScalarTagInfo(TBAAInfo));
612  else
613  Inst->setMetadata(llvm::LLVMContext::MD_tbaa, TBAAInfo);
614 }
615 
617  llvm::Instruction *I, const CXXRecordDecl *RD) {
618  I->setMetadata(llvm::LLVMContext::MD_invariant_group,
619  llvm::MDNode::get(getLLVMContext(), {}));
620 }
621 
622 void CodeGenModule::Error(SourceLocation loc, StringRef message) {
623  unsigned diagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error, "%0");
624  getDiags().Report(Context.getFullLoc(loc), diagID) << message;
625 }
626 
627 /// ErrorUnsupported - Print out an error that codegen doesn't support the
628 /// specified stmt yet.
629 void CodeGenModule::ErrorUnsupported(const Stmt *S, const char *Type) {
631  "cannot compile this %0 yet");
632  std::string Msg = Type;
633  getDiags().Report(Context.getFullLoc(S->getLocStart()), DiagID)
634  << Msg << S->getSourceRange();
635 }
636 
637 /// ErrorUnsupported - Print out an error that codegen doesn't support the
638 /// specified decl yet.
639 void CodeGenModule::ErrorUnsupported(const Decl *D, const char *Type) {
641  "cannot compile this %0 yet");
642  std::string Msg = Type;
643  getDiags().Report(Context.getFullLoc(D->getLocation()), DiagID) << Msg;
644 }
645 
646 llvm::ConstantInt *CodeGenModule::getSize(CharUnits size) {
647  return llvm::ConstantInt::get(SizeTy, size.getQuantity());
648 }
649 
650 void CodeGenModule::setGlobalVisibility(llvm::GlobalValue *GV,
651  const NamedDecl *D) const {
652  // Internal definitions always have default visibility.
653  if (GV->hasLocalLinkage()) {
654  GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
655  return;
656  }
657 
658  // Set visibility for definitions.
660  if (LV.isVisibilityExplicit() || !GV->hasAvailableExternallyLinkage())
661  GV->setVisibility(GetLLVMVisibility(LV.getVisibility()));
662 }
663 
664 static llvm::GlobalVariable::ThreadLocalMode GetLLVMTLSModel(StringRef S) {
665  return llvm::StringSwitch<llvm::GlobalVariable::ThreadLocalMode>(S)
666  .Case("global-dynamic", llvm::GlobalVariable::GeneralDynamicTLSModel)
667  .Case("local-dynamic", llvm::GlobalVariable::LocalDynamicTLSModel)
668  .Case("initial-exec", llvm::GlobalVariable::InitialExecTLSModel)
669  .Case("local-exec", llvm::GlobalVariable::LocalExecTLSModel);
670 }
671 
672 static llvm::GlobalVariable::ThreadLocalMode GetLLVMTLSModel(
674  switch (M) {
676  return llvm::GlobalVariable::GeneralDynamicTLSModel;
678  return llvm::GlobalVariable::LocalDynamicTLSModel;
680  return llvm::GlobalVariable::InitialExecTLSModel;
682  return llvm::GlobalVariable::LocalExecTLSModel;
683  }
684  llvm_unreachable("Invalid TLS model!");
685 }
686 
687 void CodeGenModule::setTLSMode(llvm::GlobalValue *GV, const VarDecl &D) const {
688  assert(D.getTLSKind() && "setting TLS mode on non-TLS var!");
689 
690  llvm::GlobalValue::ThreadLocalMode TLM;
691  TLM = GetLLVMTLSModel(CodeGenOpts.getDefaultTLSModel());
692 
693  // Override the TLS model if it is explicitly specified.
694  if (const TLSModelAttr *Attr = D.getAttr<TLSModelAttr>()) {
695  TLM = GetLLVMTLSModel(Attr->getModel());
696  }
697 
698  GV->setThreadLocalMode(TLM);
699 }
700 
702  GlobalDecl CanonicalGD = GD.getCanonicalDecl();
703 
704  // Some ABIs don't have constructor variants. Make sure that base and
705  // complete constructors get mangled the same.
706  if (const auto *CD = dyn_cast<CXXConstructorDecl>(CanonicalGD.getDecl())) {
708  CXXCtorType OrigCtorType = GD.getCtorType();
709  assert(OrigCtorType == Ctor_Base || OrigCtorType == Ctor_Complete);
710  if (OrigCtorType == Ctor_Base)
711  CanonicalGD = GlobalDecl(CD, Ctor_Complete);
712  }
713  }
714 
715  StringRef &FoundStr = MangledDeclNames[CanonicalGD];
716  if (!FoundStr.empty())
717  return FoundStr;
718 
719  const auto *ND = cast<NamedDecl>(GD.getDecl());
721  StringRef Str;
723  llvm::raw_svector_ostream Out(Buffer);
724  if (const auto *D = dyn_cast<CXXConstructorDecl>(ND))
726  else if (const auto *D = dyn_cast<CXXDestructorDecl>(ND))
728  else
730  Str = Out.str();
731  } else {
732  IdentifierInfo *II = ND->getIdentifier();
733  assert(II && "Attempt to mangle unnamed decl.");
734  const auto *FD = dyn_cast<FunctionDecl>(ND);
735 
736  if (FD &&
737  FD->getType()->castAs<FunctionType>()->getCallConv() == CC_X86RegCall) {
738  llvm::raw_svector_ostream Out(Buffer);
739  Out << "__regcall3__" << II->getName();
740  Str = Out.str();
741  } else {
742  Str = II->getName();
743  }
744  }
745 
746  // Keep the first result in the case of a mangling collision.
747  auto Result = Manglings.insert(std::make_pair(Str, GD));
748  return FoundStr = Result.first->first();
749 }
750 
752  const BlockDecl *BD) {
753  MangleContext &MangleCtx = getCXXABI().getMangleContext();
754  const Decl *D = GD.getDecl();
755 
757  llvm::raw_svector_ostream Out(Buffer);
758  if (!D)
759  MangleCtx.mangleGlobalBlock(BD,
760  dyn_cast_or_null<VarDecl>(initializedGlobalDecl.getDecl()), Out);
761  else if (const auto *CD = dyn_cast<CXXConstructorDecl>(D))
762  MangleCtx.mangleCtorBlock(CD, GD.getCtorType(), BD, Out);
763  else if (const auto *DD = dyn_cast<CXXDestructorDecl>(D))
764  MangleCtx.mangleDtorBlock(DD, GD.getDtorType(), BD, Out);
765  else
766  MangleCtx.mangleBlock(cast<DeclContext>(D), BD, Out);
767 
768  auto Result = Manglings.insert(std::make_pair(Out.str(), BD));
769  return Result.first->first();
770 }
771 
772 llvm::GlobalValue *CodeGenModule::GetGlobalValue(StringRef Name) {
773  return getModule().getNamedValue(Name);
774 }
775 
776 /// AddGlobalCtor - Add a function to the list that will be called before
777 /// main() runs.
778 void CodeGenModule::AddGlobalCtor(llvm::Function *Ctor, int Priority,
779  llvm::Constant *AssociatedData) {
780  // FIXME: Type coercion of void()* types.
781  GlobalCtors.push_back(Structor(Priority, Ctor, AssociatedData));
782 }
783 
784 /// AddGlobalDtor - Add a function to the list that will be called
785 /// when the module is unloaded.
786 void CodeGenModule::AddGlobalDtor(llvm::Function *Dtor, int Priority) {
787  // FIXME: Type coercion of void()* types.
788  GlobalDtors.push_back(Structor(Priority, Dtor, nullptr));
789 }
790 
791 void CodeGenModule::EmitCtorList(CtorList &Fns, const char *GlobalName) {
792  if (Fns.empty()) return;
793 
794  // Ctor function type is void()*.
795  llvm::FunctionType* CtorFTy = llvm::FunctionType::get(VoidTy, false);
796  llvm::Type *CtorPFTy = llvm::PointerType::getUnqual(CtorFTy);
797 
798  // Get the type of a ctor entry, { i32, void ()*, i8* }.
799  llvm::StructType *CtorStructTy = llvm::StructType::get(
800  Int32Ty, llvm::PointerType::getUnqual(CtorFTy), VoidPtrTy);
801 
802  // Construct the constructor and destructor arrays.
803  ConstantInitBuilder builder(*this);
804  auto ctors = builder.beginArray(CtorStructTy);
805  for (const auto &I : Fns) {
806  auto ctor = ctors.beginStruct(CtorStructTy);
807  ctor.addInt(Int32Ty, I.Priority);
808  ctor.add(llvm::ConstantExpr::getBitCast(I.Initializer, CtorPFTy));
809  if (I.AssociatedData)
810  ctor.add(llvm::ConstantExpr::getBitCast(I.AssociatedData, VoidPtrTy));
811  else
812  ctor.addNullPointer(VoidPtrTy);
813  ctor.finishAndAddTo(ctors);
814  }
815 
816  auto list =
817  ctors.finishAndCreateGlobal(GlobalName, getPointerAlign(),
818  /*constant*/ false,
819  llvm::GlobalValue::AppendingLinkage);
820 
821  // The LTO linker doesn't seem to like it when we set an alignment
822  // on appending variables. Take it off as a workaround.
823  list->setAlignment(0);
824 
825  Fns.clear();
826 }
827 
828 llvm::GlobalValue::LinkageTypes
830  const auto *D = cast<FunctionDecl>(GD.getDecl());
831 
833 
834  if (isa<CXXDestructorDecl>(D) &&
835  getCXXABI().useThunkForDtorVariant(cast<CXXDestructorDecl>(D),
836  GD.getDtorType())) {
837  // Destructor variants in the Microsoft C++ ABI are always internal or
838  // linkonce_odr thunks emitted on an as-needed basis.
840  : llvm::GlobalValue::LinkOnceODRLinkage;
841  }
842 
843  if (isa<CXXConstructorDecl>(D) &&
844  cast<CXXConstructorDecl>(D)->isInheritingConstructor() &&
845  Context.getTargetInfo().getCXXABI().isMicrosoft()) {
846  // Our approach to inheriting constructors is fundamentally different from
847  // that used by the MS ABI, so keep our inheriting constructor thunks
848  // internal rather than trying to pick an unambiguous mangling for them.
850  }
851 
852  return getLLVMLinkageForDeclarator(D, Linkage, /*isConstantVariable=*/false);
853 }
854 
856  const auto *FD = cast<FunctionDecl>(GD.getDecl());
857 
858  if (const auto *Dtor = dyn_cast_or_null<CXXDestructorDecl>(FD)) {
859  if (getCXXABI().useThunkForDtorVariant(Dtor, GD.getDtorType())) {
860  // Don't dllexport/import destructor thunks.
861  F->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
862  return;
863  }
864  }
865 
866  if (FD->hasAttr<DLLImportAttr>())
867  F->setDLLStorageClass(llvm::GlobalVariable::DLLImportStorageClass);
868  else if (FD->hasAttr<DLLExportAttr>())
869  F->setDLLStorageClass(llvm::GlobalVariable::DLLExportStorageClass);
870  else
871  F->setDLLStorageClass(llvm::GlobalVariable::DefaultStorageClass);
872 }
873 
874 llvm::ConstantInt *CodeGenModule::CreateCrossDsoCfiTypeId(llvm::Metadata *MD) {
875  llvm::MDString *MDS = dyn_cast<llvm::MDString>(MD);
876  if (!MDS) return nullptr;
877 
878  return llvm::ConstantInt::get(Int64Ty, llvm::MD5Hash(MDS->getString()));
879 }
880 
882  llvm::Function *F) {
883  setNonAliasAttributes(D, F);
884 }
885 
887  const CGFunctionInfo &Info,
888  llvm::Function *F) {
889  unsigned CallingConv;
890  llvm::AttributeList PAL;
891  ConstructAttributeList(F->getName(), Info, D, PAL, CallingConv, false);
892  F->setAttributes(PAL);
893  F->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv));
894 }
895 
896 /// Determines whether the language options require us to model
897 /// unwind exceptions. We treat -fexceptions as mandating this
898 /// except under the fragile ObjC ABI with only ObjC exceptions
899 /// enabled. This means, for example, that C with -fexceptions
900 /// enables this.
901 static bool hasUnwindExceptions(const LangOptions &LangOpts) {
902  // If exceptions are completely disabled, obviously this is false.
903  if (!LangOpts.Exceptions) return false;
904 
905  // If C++ exceptions are enabled, this is true.
906  if (LangOpts.CXXExceptions) return true;
907 
908  // If ObjC exceptions are enabled, this depends on the ABI.
909  if (LangOpts.ObjCExceptions) {
910  return LangOpts.ObjCRuntime.hasUnwindExceptions();
911  }
912 
913  return true;
914 }
915 
917  llvm::Function *F) {
918  llvm::AttrBuilder B;
919 
920  if (CodeGenOpts.UnwindTables)
921  B.addAttribute(llvm::Attribute::UWTable);
922 
923  if (!hasUnwindExceptions(LangOpts))
924  B.addAttribute(llvm::Attribute::NoUnwind);
925 
926  if (LangOpts.getStackProtector() == LangOptions::SSPOn)
927  B.addAttribute(llvm::Attribute::StackProtect);
928  else if (LangOpts.getStackProtector() == LangOptions::SSPStrong)
929  B.addAttribute(llvm::Attribute::StackProtectStrong);
930  else if (LangOpts.getStackProtector() == LangOptions::SSPReq)
931  B.addAttribute(llvm::Attribute::StackProtectReq);
932 
933  if (!D) {
934  // If we don't have a declaration to control inlining, the function isn't
935  // explicitly marked as alwaysinline for semantic reasons, and inlining is
936  // disabled, mark the function as noinline.
937  if (!F->hasFnAttribute(llvm::Attribute::AlwaysInline) &&
938  CodeGenOpts.getInlining() == CodeGenOptions::OnlyAlwaysInlining)
939  B.addAttribute(llvm::Attribute::NoInline);
940 
941  F->addAttributes(llvm::AttributeList::FunctionIndex, B);
942  return;
943  }
944 
945  // Track whether we need to add the optnone LLVM attribute,
946  // starting with the default for this optimization level.
947  bool ShouldAddOptNone =
948  !CodeGenOpts.DisableO0ImplyOptNone && CodeGenOpts.OptimizationLevel == 0;
949  // We can't add optnone in the following cases, it won't pass the verifier.
950  ShouldAddOptNone &= !D->hasAttr<MinSizeAttr>();
951  ShouldAddOptNone &= !F->hasFnAttribute(llvm::Attribute::AlwaysInline);
952  ShouldAddOptNone &= !D->hasAttr<AlwaysInlineAttr>();
953 
954  if (ShouldAddOptNone || D->hasAttr<OptimizeNoneAttr>()) {
955  B.addAttribute(llvm::Attribute::OptimizeNone);
956 
957  // OptimizeNone implies noinline; we should not be inlining such functions.
958  B.addAttribute(llvm::Attribute::NoInline);
959  assert(!F->hasFnAttribute(llvm::Attribute::AlwaysInline) &&
960  "OptimizeNone and AlwaysInline on same function!");
961 
962  // We still need to handle naked functions even though optnone subsumes
963  // much of their semantics.
964  if (D->hasAttr<NakedAttr>())
965  B.addAttribute(llvm::Attribute::Naked);
966 
967  // OptimizeNone wins over OptimizeForSize and MinSize.
968  F->removeFnAttr(llvm::Attribute::OptimizeForSize);
969  F->removeFnAttr(llvm::Attribute::MinSize);
970  } else if (D->hasAttr<NakedAttr>()) {
971  // Naked implies noinline: we should not be inlining such functions.
972  B.addAttribute(llvm::Attribute::Naked);
973  B.addAttribute(llvm::Attribute::NoInline);
974  } else if (D->hasAttr<NoDuplicateAttr>()) {
975  B.addAttribute(llvm::Attribute::NoDuplicate);
976  } else if (D->hasAttr<NoInlineAttr>()) {
977  B.addAttribute(llvm::Attribute::NoInline);
978  } else if (D->hasAttr<AlwaysInlineAttr>() &&
979  !F->hasFnAttribute(llvm::Attribute::NoInline)) {
980  // (noinline wins over always_inline, and we can't specify both in IR)
981  B.addAttribute(llvm::Attribute::AlwaysInline);
982  } else if (CodeGenOpts.getInlining() == CodeGenOptions::OnlyAlwaysInlining) {
983  // If we're not inlining, then force everything that isn't always_inline to
984  // carry an explicit noinline attribute.
985  if (!F->hasFnAttribute(llvm::Attribute::AlwaysInline))
986  B.addAttribute(llvm::Attribute::NoInline);
987  } else {
988  // Otherwise, propagate the inline hint attribute and potentially use its
989  // absence to mark things as noinline.
990  if (auto *FD = dyn_cast<FunctionDecl>(D)) {
991  if (any_of(FD->redecls(), [&](const FunctionDecl *Redecl) {
992  return Redecl->isInlineSpecified();
993  })) {
994  B.addAttribute(llvm::Attribute::InlineHint);
995  } else if (CodeGenOpts.getInlining() ==
997  !FD->isInlined() &&
998  !F->hasFnAttribute(llvm::Attribute::AlwaysInline)) {
999  B.addAttribute(llvm::Attribute::NoInline);
1000  }
1001  }
1002  }
1003 
1004  // Add other optimization related attributes if we are optimizing this
1005  // function.
1006  if (!D->hasAttr<OptimizeNoneAttr>()) {
1007  if (D->hasAttr<ColdAttr>()) {
1008  if (!ShouldAddOptNone)
1009  B.addAttribute(llvm::Attribute::OptimizeForSize);
1010  B.addAttribute(llvm::Attribute::Cold);
1011  }
1012 
1013  if (D->hasAttr<MinSizeAttr>())
1014  B.addAttribute(llvm::Attribute::MinSize);
1015  }
1016 
1017  F->addAttributes(llvm::AttributeList::FunctionIndex, B);
1018 
1019  unsigned alignment = D->getMaxAlignment() / Context.getCharWidth();
1020  if (alignment)
1021  F->setAlignment(alignment);
1022 
1023  // Some C++ ABIs require 2-byte alignment for member functions, in order to
1024  // reserve a bit for differentiating between virtual and non-virtual member
1025  // functions. If the current target's C++ ABI requires this and this is a
1026  // member function, set its alignment accordingly.
1027  if (getTarget().getCXXABI().areMemberFunctionsAligned()) {
1028  if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D))
1029  F->setAlignment(2);
1030  }
1031 
1032  // In the cross-dso CFI mode, we want !type attributes on definitions only.
1033  if (CodeGenOpts.SanitizeCfiCrossDso)
1034  if (auto *FD = dyn_cast<FunctionDecl>(D))
1036 }
1037 
1039  llvm::GlobalValue *GV) {
1040  if (const auto *ND = dyn_cast_or_null<NamedDecl>(D))
1041  setGlobalVisibility(GV, ND);
1042  else
1043  GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
1044 
1045  if (D && D->hasAttr<UsedAttr>())
1046  addUsedGlobal(GV);
1047 }
1048 
1050  llvm::GlobalValue *GV) {
1051  SetCommonAttributes(D, GV);
1052 
1053  // Process the dllexport attribute based on whether the original definition
1054  // (not necessarily the aliasee) was exported.
1055  if (D->hasAttr<DLLExportAttr>())
1056  GV->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
1057 }
1058 
1059 void CodeGenModule::setNonAliasAttributes(const Decl *D,
1060  llvm::GlobalObject *GO) {
1061  SetCommonAttributes(D, GO);
1062 
1063  if (D) {
1064  if (auto *GV = dyn_cast<llvm::GlobalVariable>(GO)) {
1065  if (auto *SA = D->getAttr<PragmaClangBSSSectionAttr>())
1066  GV->addAttribute("bss-section", SA->getName());
1067  if (auto *SA = D->getAttr<PragmaClangDataSectionAttr>())
1068  GV->addAttribute("data-section", SA->getName());
1069  if (auto *SA = D->getAttr<PragmaClangRodataSectionAttr>())
1070  GV->addAttribute("rodata-section", SA->getName());
1071  }
1072 
1073  if (auto *F = dyn_cast<llvm::Function>(GO)) {
1074  if (auto *SA = D->getAttr<PragmaClangTextSectionAttr>())
1075  if (!D->getAttr<SectionAttr>())
1076  F->addFnAttr("implicit-section-name", SA->getName());
1077  }
1078 
1079  if (const SectionAttr *SA = D->getAttr<SectionAttr>())
1080  GO->setSection(SA->getName());
1081  }
1082 
1083  getTargetCodeGenInfo().setTargetAttributes(D, GO, *this);
1084 }
1085 
1087  llvm::Function *F,
1088  const CGFunctionInfo &FI) {
1089  SetLLVMFunctionAttributes(D, FI, F);
1091 
1092  F->setLinkage(llvm::Function::InternalLinkage);
1093 
1094  setNonAliasAttributes(D, F);
1095 }
1096 
1097 static void setLinkageAndVisibilityForGV(llvm::GlobalValue *GV,
1098  const NamedDecl *ND) {
1099  // Set linkage and visibility in case we never see a definition.
1101  if (!isExternallyVisible(LV.getLinkage())) {
1102  // Don't set internal linkage on declarations.
1103  } else {
1104  if (ND->hasAttr<DLLImportAttr>()) {
1106  GV->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
1107  } else if (ND->hasAttr<DLLExportAttr>()) {
1108  GV->setLinkage(llvm::GlobalValue::ExternalLinkage);
1109  } else if (ND->hasAttr<WeakAttr>() || ND->isWeakImported()) {
1110  // "extern_weak" is overloaded in LLVM; we probably should have
1111  // separate linkage types for this.
1112  GV->setLinkage(llvm::GlobalValue::ExternalWeakLinkage);
1113  }
1114 
1115  // Set visibility on a declaration only if it's explicit.
1116  if (LV.isVisibilityExplicit())
1117  GV->setVisibility(CodeGenModule::GetLLVMVisibility(LV.getVisibility()));
1118  }
1119 }
1120 
1122  llvm::Function *F) {
1123  // Only if we are checking indirect calls.
1124  if (!LangOpts.Sanitize.has(SanitizerKind::CFIICall))
1125  return;
1126 
1127  // Non-static class methods are handled via vtable pointer checks elsewhere.
1128  if (isa<CXXMethodDecl>(FD) && !cast<CXXMethodDecl>(FD)->isStatic())
1129  return;
1130 
1131  // Additionally, if building with cross-DSO support...
1132  if (CodeGenOpts.SanitizeCfiCrossDso) {
1133  // Skip available_externally functions. They won't be codegen'ed in the
1134  // current module anyway.
1136  return;
1137  }
1138 
1139  llvm::Metadata *MD = CreateMetadataIdentifierForType(FD->getType());
1140  F->addTypeMetadata(0, MD);
1141 
1142  // Emit a hash-based bit set entry for cross-DSO calls.
1143  if (CodeGenOpts.SanitizeCfiCrossDso)
1144  if (auto CrossDsoTypeId = CreateCrossDsoCfiTypeId(MD))
1145  F->addTypeMetadata(0, llvm::ConstantAsMetadata::get(CrossDsoTypeId));
1146 }
1147 
1148 void CodeGenModule::SetFunctionAttributes(GlobalDecl GD, llvm::Function *F,
1149  bool IsIncompleteFunction,
1150  bool IsThunk) {
1151  if (llvm::Intrinsic::ID IID = F->getIntrinsicID()) {
1152  // If this is an intrinsic function, set the function's attributes
1153  // to the intrinsic's attributes.
1154  F->setAttributes(llvm::Intrinsic::getAttributes(getLLVMContext(), IID));
1155  return;
1156  }
1157 
1158  const auto *FD = cast<FunctionDecl>(GD.getDecl());
1159 
1160  if (!IsIncompleteFunction)
1161  SetLLVMFunctionAttributes(FD, getTypes().arrangeGlobalDeclaration(GD), F);
1162 
1163  // Add the Returned attribute for "this", except for iOS 5 and earlier
1164  // where substantial code, including the libstdc++ dylib, was compiled with
1165  // GCC and does not actually return "this".
1166  if (!IsThunk && getCXXABI().HasThisReturn(GD) &&
1167  !(getTriple().isiOS() && getTriple().isOSVersionLT(6))) {
1168  assert(!F->arg_empty() &&
1169  F->arg_begin()->getType()
1170  ->canLosslesslyBitCastTo(F->getReturnType()) &&
1171  "unexpected this return");
1172  F->addAttribute(1, llvm::Attribute::Returned);
1173  }
1174 
1175  // Only a few attributes are set on declarations; these may later be
1176  // overridden by a definition.
1177 
1179 
1180  if (FD->getAttr<PragmaClangTextSectionAttr>()) {
1181  F->addFnAttr("implicit-section-name");
1182  }
1183 
1184  if (const SectionAttr *SA = FD->getAttr<SectionAttr>())
1185  F->setSection(SA->getName());
1186 
1187  if (FD->isReplaceableGlobalAllocationFunction()) {
1188  // A replaceable global allocation function does not act like a builtin by
1189  // default, only if it is invoked by a new-expression or delete-expression.
1190  F->addAttribute(llvm::AttributeList::FunctionIndex,
1191  llvm::Attribute::NoBuiltin);
1192 
1193  // A sane operator new returns a non-aliasing pointer.
1194  // FIXME: Also add NonNull attribute to the return value
1195  // for the non-nothrow forms?
1196  auto Kind = FD->getDeclName().getCXXOverloadedOperator();
1197  if (getCodeGenOpts().AssumeSaneOperatorNew &&
1198  (Kind == OO_New || Kind == OO_Array_New))
1199  F->addAttribute(llvm::AttributeList::ReturnIndex,
1200  llvm::Attribute::NoAlias);
1201  }
1202 
1203  if (isa<CXXConstructorDecl>(FD) || isa<CXXDestructorDecl>(FD))
1204  F->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1205  else if (const auto *MD = dyn_cast<CXXMethodDecl>(FD))
1206  if (MD->isVirtual())
1207  F->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1208 
1209  // Don't emit entries for function declarations in the cross-DSO mode. This
1210  // is handled with better precision by the receiving DSO.
1211  if (!CodeGenOpts.SanitizeCfiCrossDso)
1213 }
1214 
1215 void CodeGenModule::addUsedGlobal(llvm::GlobalValue *GV) {
1216  assert(!GV->isDeclaration() &&
1217  "Only globals with definition can force usage.");
1218  LLVMUsed.emplace_back(GV);
1219 }
1220 
1221 void CodeGenModule::addCompilerUsedGlobal(llvm::GlobalValue *GV) {
1222  assert(!GV->isDeclaration() &&
1223  "Only globals with definition can force usage.");
1224  LLVMCompilerUsed.emplace_back(GV);
1225 }
1226 
1227 static void emitUsed(CodeGenModule &CGM, StringRef Name,
1228  std::vector<llvm::WeakTrackingVH> &List) {
1229  // Don't create llvm.used if there is no need.
1230  if (List.empty())
1231  return;
1232 
1233  // Convert List to what ConstantArray needs.
1235  UsedArray.resize(List.size());
1236  for (unsigned i = 0, e = List.size(); i != e; ++i) {
1237  UsedArray[i] =
1238  llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(
1239  cast<llvm::Constant>(&*List[i]), CGM.Int8PtrTy);
1240  }
1241 
1242  if (UsedArray.empty())
1243  return;
1244  llvm::ArrayType *ATy = llvm::ArrayType::get(CGM.Int8PtrTy, UsedArray.size());
1245 
1246  auto *GV = new llvm::GlobalVariable(
1247  CGM.getModule(), ATy, false, llvm::GlobalValue::AppendingLinkage,
1248  llvm::ConstantArray::get(ATy, UsedArray), Name);
1249 
1250  GV->setSection("llvm.metadata");
1251 }
1252 
1253 void CodeGenModule::emitLLVMUsed() {
1254  emitUsed(*this, "llvm.used", LLVMUsed);
1255  emitUsed(*this, "llvm.compiler.used", LLVMCompilerUsed);
1256 }
1257 
1259  auto *MDOpts = llvm::MDString::get(getLLVMContext(), Opts);
1260  LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
1261 }
1262 
1263 void CodeGenModule::AddDetectMismatch(StringRef Name, StringRef Value) {
1265  getTargetCodeGenInfo().getDetectMismatchOption(Name, Value, Opt);
1266  auto *MDOpts = llvm::MDString::get(getLLVMContext(), Opt);
1267  LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
1268 }
1269 
1270 void CodeGenModule::AddDependentLib(StringRef Lib) {
1273  auto *MDOpts = llvm::MDString::get(getLLVMContext(), Opt);
1274  LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
1275 }
1276 
1277 /// \brief Add link options implied by the given module, including modules
1278 /// it depends on, using a postorder walk.
1281  llvm::SmallPtrSet<Module *, 16> &Visited) {
1282  // Import this module's parent.
1283  if (Mod->Parent && Visited.insert(Mod->Parent).second) {
1284  addLinkOptionsPostorder(CGM, Mod->Parent, Metadata, Visited);
1285  }
1286 
1287  // Import this module's dependencies.
1288  for (unsigned I = Mod->Imports.size(); I > 0; --I) {
1289  if (Visited.insert(Mod->Imports[I - 1]).second)
1290  addLinkOptionsPostorder(CGM, Mod->Imports[I-1], Metadata, Visited);
1291  }
1292 
1293  // Add linker options to link against the libraries/frameworks
1294  // described by this module.
1295  llvm::LLVMContext &Context = CGM.getLLVMContext();
1296  for (unsigned I = Mod->LinkLibraries.size(); I > 0; --I) {
1297  // Link against a framework. Frameworks are currently Darwin only, so we
1298  // don't to ask TargetCodeGenInfo for the spelling of the linker option.
1299  if (Mod->LinkLibraries[I-1].IsFramework) {
1300  llvm::Metadata *Args[2] = {
1301  llvm::MDString::get(Context, "-framework"),
1302  llvm::MDString::get(Context, Mod->LinkLibraries[I - 1].Library)};
1303 
1304  Metadata.push_back(llvm::MDNode::get(Context, Args));
1305  continue;
1306  }
1307 
1308  // Link against a library.
1311  Mod->LinkLibraries[I-1].Library, Opt);
1312  auto *OptString = llvm::MDString::get(Context, Opt);
1313  Metadata.push_back(llvm::MDNode::get(Context, OptString));
1314  }
1315 }
1316 
1317 void CodeGenModule::EmitModuleLinkOptions() {
1318  // Collect the set of all of the modules we want to visit to emit link
1319  // options, which is essentially the imported modules and all of their
1320  // non-explicit child modules.
1321  llvm::SetVector<clang::Module *> LinkModules;
1322  llvm::SmallPtrSet<clang::Module *, 16> Visited;
1324 
1325  // Seed the stack with imported modules.
1326  for (Module *M : ImportedModules) {
1327  // Do not add any link flags when an implementation TU of a module imports
1328  // a header of that same module.
1329  if (M->getTopLevelModuleName() == getLangOpts().CurrentModule &&
1331  continue;
1332  if (Visited.insert(M).second)
1333  Stack.push_back(M);
1334  }
1335 
1336  // Find all of the modules to import, making a little effort to prune
1337  // non-leaf modules.
1338  while (!Stack.empty()) {
1339  clang::Module *Mod = Stack.pop_back_val();
1340 
1341  bool AnyChildren = false;
1342 
1343  // Visit the submodules of this module.
1345  SubEnd = Mod->submodule_end();
1346  Sub != SubEnd; ++Sub) {
1347  // Skip explicit children; they need to be explicitly imported to be
1348  // linked against.
1349  if ((*Sub)->IsExplicit)
1350  continue;
1351 
1352  if (Visited.insert(*Sub).second) {
1353  Stack.push_back(*Sub);
1354  AnyChildren = true;
1355  }
1356  }
1357 
1358  // We didn't find any children, so add this module to the list of
1359  // modules to link against.
1360  if (!AnyChildren) {
1361  LinkModules.insert(Mod);
1362  }
1363  }
1364 
1365  // Add link options for all of the imported modules in reverse topological
1366  // order. We don't do anything to try to order import link flags with respect
1367  // to linker options inserted by things like #pragma comment().
1368  SmallVector<llvm::MDNode *, 16> MetadataArgs;
1369  Visited.clear();
1370  for (Module *M : LinkModules)
1371  if (Visited.insert(M).second)
1372  addLinkOptionsPostorder(*this, M, MetadataArgs, Visited);
1373  std::reverse(MetadataArgs.begin(), MetadataArgs.end());
1374  LinkerOptionsMetadata.append(MetadataArgs.begin(), MetadataArgs.end());
1375 
1376  // Add the linker options metadata flag.
1377  auto *NMD = getModule().getOrInsertNamedMetadata("llvm.linker.options");
1378  for (auto *MD : LinkerOptionsMetadata)
1379  NMD->addOperand(MD);
1380 }
1381 
1382 void CodeGenModule::EmitDeferred() {
1383  // Emit code for any potentially referenced deferred decls. Since a
1384  // previously unused static decl may become used during the generation of code
1385  // for a static function, iterate until no changes are made.
1386 
1387  if (!DeferredVTables.empty()) {
1388  EmitDeferredVTables();
1389 
1390  // Emitting a vtable doesn't directly cause more vtables to
1391  // become deferred, although it can cause functions to be
1392  // emitted that then need those vtables.
1393  assert(DeferredVTables.empty());
1394  }
1395 
1396  // Stop if we're out of both deferred vtables and deferred declarations.
1397  if (DeferredDeclsToEmit.empty())
1398  return;
1399 
1400  // Grab the list of decls to emit. If EmitGlobalDefinition schedules more
1401  // work, it will not interfere with this.
1402  std::vector<GlobalDecl> CurDeclsToEmit;
1403  CurDeclsToEmit.swap(DeferredDeclsToEmit);
1404 
1405  for (GlobalDecl &D : CurDeclsToEmit) {
1406  // We should call GetAddrOfGlobal with IsForDefinition set to true in order
1407  // to get GlobalValue with exactly the type we need, not something that
1408  // might had been created for another decl with the same mangled name but
1409  // different type.
1410  llvm::GlobalValue *GV = dyn_cast<llvm::GlobalValue>(
1412 
1413  // In case of different address spaces, we may still get a cast, even with
1414  // IsForDefinition equal to true. Query mangled names table to get
1415  // GlobalValue.
1416  if (!GV)
1417  GV = GetGlobalValue(getMangledName(D));
1418 
1419  // Make sure GetGlobalValue returned non-null.
1420  assert(GV);
1421 
1422  // Check to see if we've already emitted this. This is necessary
1423  // for a couple of reasons: first, decls can end up in the
1424  // deferred-decls queue multiple times, and second, decls can end
1425  // up with definitions in unusual ways (e.g. by an extern inline
1426  // function acquiring a strong function redefinition). Just
1427  // ignore these cases.
1428  if (!GV->isDeclaration())
1429  continue;
1430 
1431  // Otherwise, emit the definition and move on to the next one.
1432  EmitGlobalDefinition(D, GV);
1433 
1434  // If we found out that we need to emit more decls, do that recursively.
1435  // This has the advantage that the decls are emitted in a DFS and related
1436  // ones are close together, which is convenient for testing.
1437  if (!DeferredVTables.empty() || !DeferredDeclsToEmit.empty()) {
1438  EmitDeferred();
1439  assert(DeferredVTables.empty() && DeferredDeclsToEmit.empty());
1440  }
1441  }
1442 }
1443 
1444 void CodeGenModule::EmitVTablesOpportunistically() {
1445  // Try to emit external vtables as available_externally if they have emitted
1446  // all inlined virtual functions. It runs after EmitDeferred() and therefore
1447  // is not allowed to create new references to things that need to be emitted
1448  // lazily. Note that it also uses fact that we eagerly emitting RTTI.
1449 
1450  assert((OpportunisticVTables.empty() || shouldOpportunisticallyEmitVTables())
1451  && "Only emit opportunistic vtables with optimizations");
1452 
1453  for (const CXXRecordDecl *RD : OpportunisticVTables) {
1454  assert(getVTables().isVTableExternal(RD) &&
1455  "This queue should only contain external vtables");
1456  if (getCXXABI().canSpeculativelyEmitVTable(RD))
1457  VTables.GenerateClassData(RD);
1458  }
1459  OpportunisticVTables.clear();
1460 }
1461 
1463  if (Annotations.empty())
1464  return;
1465 
1466  // Create a new global variable for the ConstantStruct in the Module.
1467  llvm::Constant *Array = llvm::ConstantArray::get(llvm::ArrayType::get(
1468  Annotations[0]->getType(), Annotations.size()), Annotations);
1469  auto *gv = new llvm::GlobalVariable(getModule(), Array->getType(), false,
1470  llvm::GlobalValue::AppendingLinkage,
1471  Array, "llvm.global.annotations");
1472  gv->setSection(AnnotationSection);
1473 }
1474 
1475 llvm::Constant *CodeGenModule::EmitAnnotationString(StringRef Str) {
1476  llvm::Constant *&AStr = AnnotationStrings[Str];
1477  if (AStr)
1478  return AStr;
1479 
1480  // Not found yet, create a new global.
1481  llvm::Constant *s = llvm::ConstantDataArray::getString(getLLVMContext(), Str);
1482  auto *gv =
1483  new llvm::GlobalVariable(getModule(), s->getType(), true,
1484  llvm::GlobalValue::PrivateLinkage, s, ".str");
1485  gv->setSection(AnnotationSection);
1486  gv->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1487  AStr = gv;
1488  return gv;
1489 }
1490 
1493  PresumedLoc PLoc = SM.getPresumedLoc(Loc);
1494  if (PLoc.isValid())
1495  return EmitAnnotationString(PLoc.getFilename());
1496  return EmitAnnotationString(SM.getBufferName(Loc));
1497 }
1498 
1501  PresumedLoc PLoc = SM.getPresumedLoc(L);
1502  unsigned LineNo = PLoc.isValid() ? PLoc.getLine() :
1503  SM.getExpansionLineNumber(L);
1504  return llvm::ConstantInt::get(Int32Ty, LineNo);
1505 }
1506 
1507 llvm::Constant *CodeGenModule::EmitAnnotateAttr(llvm::GlobalValue *GV,
1508  const AnnotateAttr *AA,
1509  SourceLocation L) {
1510  // Get the globals for file name, annotation, and the line number.
1511  llvm::Constant *AnnoGV = EmitAnnotationString(AA->getAnnotation()),
1512  *UnitGV = EmitAnnotationUnit(L),
1513  *LineNoCst = EmitAnnotationLineNo(L);
1514 
1515  // Create the ConstantStruct for the global annotation.
1516  llvm::Constant *Fields[4] = {
1517  llvm::ConstantExpr::getBitCast(GV, Int8PtrTy),
1518  llvm::ConstantExpr::getBitCast(AnnoGV, Int8PtrTy),
1519  llvm::ConstantExpr::getBitCast(UnitGV, Int8PtrTy),
1520  LineNoCst
1521  };
1522  return llvm::ConstantStruct::getAnon(Fields);
1523 }
1524 
1526  llvm::GlobalValue *GV) {
1527  assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute");
1528  // Get the struct elements for these annotations.
1529  for (const auto *I : D->specific_attrs<AnnotateAttr>())
1530  Annotations.push_back(EmitAnnotateAttr(GV, I, D->getLocation()));
1531 }
1532 
1534  SourceLocation Loc) const {
1535  const auto &SanitizerBL = getContext().getSanitizerBlacklist();
1536  // Blacklist by function name.
1537  if (SanitizerBL.isBlacklistedFunction(Fn->getName()))
1538  return true;
1539  // Blacklist by location.
1540  if (Loc.isValid())
1541  return SanitizerBL.isBlacklistedLocation(Loc);
1542  // If location is unknown, this may be a compiler-generated function. Assume
1543  // it's located in the main file.
1544  auto &SM = Context.getSourceManager();
1545  if (const auto *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
1546  return SanitizerBL.isBlacklistedFile(MainFile->getName());
1547  }
1548  return false;
1549 }
1550 
1551 bool CodeGenModule::isInSanitizerBlacklist(llvm::GlobalVariable *GV,
1552  SourceLocation Loc, QualType Ty,
1553  StringRef Category) const {
1554  // For now globals can be blacklisted only in ASan and KASan.
1555  if (!LangOpts.Sanitize.hasOneOf(
1556  SanitizerKind::Address | SanitizerKind::KernelAddress))
1557  return false;
1558  const auto &SanitizerBL = getContext().getSanitizerBlacklist();
1559  if (SanitizerBL.isBlacklistedGlobal(GV->getName(), Category))
1560  return true;
1561  if (SanitizerBL.isBlacklistedLocation(Loc, Category))
1562  return true;
1563  // Check global type.
1564  if (!Ty.isNull()) {
1565  // Drill down the array types: if global variable of a fixed type is
1566  // blacklisted, we also don't instrument arrays of them.
1567  while (auto AT = dyn_cast<ArrayType>(Ty.getTypePtr()))
1568  Ty = AT->getElementType();
1570  // We allow to blacklist only record types (classes, structs etc.)
1571  if (Ty->isRecordType()) {
1572  std::string TypeStr = Ty.getAsString(getContext().getPrintingPolicy());
1573  if (SanitizerBL.isBlacklistedType(TypeStr, Category))
1574  return true;
1575  }
1576  }
1577  return false;
1578 }
1579 
1580 bool CodeGenModule::imbueXRayAttrs(llvm::Function *Fn, SourceLocation Loc,
1581  StringRef Category) const {
1582  if (!LangOpts.XRayInstrument)
1583  return false;
1584  const auto &XRayFilter = getContext().getXRayFilter();
1585  using ImbueAttr = XRayFunctionFilter::ImbueAttribute;
1587  if (Loc.isValid())
1588  Attr = XRayFilter.shouldImbueLocation(Loc, Category);
1589  if (Attr == ImbueAttr::NONE)
1590  Attr = XRayFilter.shouldImbueFunction(Fn->getName());
1591  switch (Attr) {
1592  case ImbueAttr::NONE:
1593  return false;
1594  case ImbueAttr::ALWAYS:
1595  Fn->addFnAttr("function-instrument", "xray-always");
1596  break;
1597  case ImbueAttr::ALWAYS_ARG1:
1598  Fn->addFnAttr("function-instrument", "xray-always");
1599  Fn->addFnAttr("xray-log-args", "1");
1600  break;
1601  case ImbueAttr::NEVER:
1602  Fn->addFnAttr("function-instrument", "xray-never");
1603  break;
1604  }
1605  return true;
1606 }
1607 
1608 bool CodeGenModule::MustBeEmitted(const ValueDecl *Global) {
1609  // Never defer when EmitAllDecls is specified.
1610  if (LangOpts.EmitAllDecls)
1611  return true;
1612 
1613  return getContext().DeclMustBeEmitted(Global);
1614 }
1615 
1616 bool CodeGenModule::MayBeEmittedEagerly(const ValueDecl *Global) {
1617  if (const auto *FD = dyn_cast<FunctionDecl>(Global))
1618  if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
1619  // Implicit template instantiations may change linkage if they are later
1620  // explicitly instantiated, so they should not be emitted eagerly.
1621  return false;
1622  if (const auto *VD = dyn_cast<VarDecl>(Global))
1623  if (Context.getInlineVariableDefinitionKind(VD) ==
1625  // A definition of an inline constexpr static data member may change
1626  // linkage later if it's redeclared outside the class.
1627  return false;
1628  // If OpenMP is enabled and threadprivates must be generated like TLS, delay
1629  // codegen for global variables, because they may be marked as threadprivate.
1630  if (LangOpts.OpenMP && LangOpts.OpenMPUseTLS &&
1631  getContext().getTargetInfo().isTLSSupported() && isa<VarDecl>(Global))
1632  return false;
1633 
1634  return true;
1635 }
1636 
1638  const CXXUuidofExpr* E) {
1639  // Sema has verified that IIDSource has a __declspec(uuid()), and that its
1640  // well-formed.
1641  StringRef Uuid = E->getUuidStr();
1642  std::string Name = "_GUID_" + Uuid.lower();
1643  std::replace(Name.begin(), Name.end(), '-', '_');
1644 
1645  // The UUID descriptor should be pointer aligned.
1647 
1648  // Look for an existing global.
1649  if (llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name))
1650  return ConstantAddress(GV, Alignment);
1651 
1652  llvm::Constant *Init = EmitUuidofInitializer(Uuid);
1653  assert(Init && "failed to initialize as constant");
1654 
1655  auto *GV = new llvm::GlobalVariable(
1656  getModule(), Init->getType(),
1657  /*isConstant=*/true, llvm::GlobalValue::LinkOnceODRLinkage, Init, Name);
1658  if (supportsCOMDAT())
1659  GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
1660  return ConstantAddress(GV, Alignment);
1661 }
1662 
1664  const AliasAttr *AA = VD->getAttr<AliasAttr>();
1665  assert(AA && "No alias?");
1666 
1667  CharUnits Alignment = getContext().getDeclAlign(VD);
1668  llvm::Type *DeclTy = getTypes().ConvertTypeForMem(VD->getType());
1669 
1670  // See if there is already something with the target's name in the module.
1671  llvm::GlobalValue *Entry = GetGlobalValue(AA->getAliasee());
1672  if (Entry) {
1673  unsigned AS = getContext().getTargetAddressSpace(VD->getType());
1674  auto Ptr = llvm::ConstantExpr::getBitCast(Entry, DeclTy->getPointerTo(AS));
1675  return ConstantAddress(Ptr, Alignment);
1676  }
1677 
1678  llvm::Constant *Aliasee;
1679  if (isa<llvm::FunctionType>(DeclTy))
1680  Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy,
1681  GlobalDecl(cast<FunctionDecl>(VD)),
1682  /*ForVTable=*/false);
1683  else
1684  Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
1685  llvm::PointerType::getUnqual(DeclTy),
1686  nullptr);
1687 
1688  auto *F = cast<llvm::GlobalValue>(Aliasee);
1689  F->setLinkage(llvm::Function::ExternalWeakLinkage);
1690  WeakRefReferences.insert(F);
1691 
1692  return ConstantAddress(Aliasee, Alignment);
1693 }
1694 
1696  const auto *Global = cast<ValueDecl>(GD.getDecl());
1697 
1698  // Weak references don't produce any output by themselves.
1699  if (Global->hasAttr<WeakRefAttr>())
1700  return;
1701 
1702  // If this is an alias definition (which otherwise looks like a declaration)
1703  // emit it now.
1704  if (Global->hasAttr<AliasAttr>())
1705  return EmitAliasDefinition(GD);
1706 
1707  // IFunc like an alias whose value is resolved at runtime by calling resolver.
1708  if (Global->hasAttr<IFuncAttr>())
1709  return emitIFuncDefinition(GD);
1710 
1711  // If this is CUDA, be selective about which declarations we emit.
1712  if (LangOpts.CUDA) {
1713  if (LangOpts.CUDAIsDevice) {
1714  if (!Global->hasAttr<CUDADeviceAttr>() &&
1715  !Global->hasAttr<CUDAGlobalAttr>() &&
1716  !Global->hasAttr<CUDAConstantAttr>() &&
1717  !Global->hasAttr<CUDASharedAttr>())
1718  return;
1719  } else {
1720  // We need to emit host-side 'shadows' for all global
1721  // device-side variables because the CUDA runtime needs their
1722  // size and host-side address in order to provide access to
1723  // their device-side incarnations.
1724 
1725  // So device-only functions are the only things we skip.
1726  if (isa<FunctionDecl>(Global) && !Global->hasAttr<CUDAHostAttr>() &&
1727  Global->hasAttr<CUDADeviceAttr>())
1728  return;
1729 
1730  assert((isa<FunctionDecl>(Global) || isa<VarDecl>(Global)) &&
1731  "Expected Variable or Function");
1732  }
1733  }
1734 
1735  if (LangOpts.OpenMP) {
1736  // If this is OpenMP device, check if it is legal to emit this global
1737  // normally.
1738  if (OpenMPRuntime && OpenMPRuntime->emitTargetGlobal(GD))
1739  return;
1740  if (auto *DRD = dyn_cast<OMPDeclareReductionDecl>(Global)) {
1741  if (MustBeEmitted(Global))
1743  return;
1744  }
1745  }
1746 
1747  // Ignore declarations, they will be emitted on their first use.
1748  if (const auto *FD = dyn_cast<FunctionDecl>(Global)) {
1749  // Forward declarations are emitted lazily on first use.
1750  if (!FD->doesThisDeclarationHaveABody()) {
1751  if (!FD->doesDeclarationForceExternallyVisibleDefinition())
1752  return;
1753 
1754  StringRef MangledName = getMangledName(GD);
1755 
1756  // Compute the function info and LLVM type.
1758  llvm::Type *Ty = getTypes().GetFunctionType(FI);
1759 
1760  GetOrCreateLLVMFunction(MangledName, Ty, GD, /*ForVTable=*/false,
1761  /*DontDefer=*/false);
1762  return;
1763  }
1764  } else {
1765  const auto *VD = cast<VarDecl>(Global);
1766  assert(VD->isFileVarDecl() && "Cannot emit local var decl as global.");
1767  // We need to emit device-side global CUDA variables even if a
1768  // variable does not have a definition -- we still need to define
1769  // host-side shadow for it.
1770  bool MustEmitForCuda = LangOpts.CUDA && !LangOpts.CUDAIsDevice &&
1771  !VD->hasDefinition() &&
1772  (VD->hasAttr<CUDAConstantAttr>() ||
1773  VD->hasAttr<CUDADeviceAttr>());
1774  if (!MustEmitForCuda &&
1775  VD->isThisDeclarationADefinition() != VarDecl::Definition &&
1776  !Context.isMSStaticDataMemberInlineDefinition(VD)) {
1777  // If this declaration may have caused an inline variable definition to
1778  // change linkage, make sure that it's emitted.
1779  if (Context.getInlineVariableDefinitionKind(VD) ==
1781  GetAddrOfGlobalVar(VD);
1782  return;
1783  }
1784  }
1785 
1786  // Defer code generation to first use when possible, e.g. if this is an inline
1787  // function. If the global must always be emitted, do it eagerly if possible
1788  // to benefit from cache locality.
1789  if (MustBeEmitted(Global) && MayBeEmittedEagerly(Global)) {
1790  // Emit the definition if it can't be deferred.
1791  EmitGlobalDefinition(GD);
1792  return;
1793  }
1794 
1795  // If we're deferring emission of a C++ variable with an
1796  // initializer, remember the order in which it appeared in the file.
1797  if (getLangOpts().CPlusPlus && isa<VarDecl>(Global) &&
1798  cast<VarDecl>(Global)->hasInit()) {
1799  DelayedCXXInitPosition[Global] = CXXGlobalInits.size();
1800  CXXGlobalInits.push_back(nullptr);
1801  }
1802 
1803  StringRef MangledName = getMangledName(GD);
1804  if (GetGlobalValue(MangledName) != nullptr) {
1805  // The value has already been used and should therefore be emitted.
1806  addDeferredDeclToEmit(GD);
1807  } else if (MustBeEmitted(Global)) {
1808  // The value must be emitted, but cannot be emitted eagerly.
1809  assert(!MayBeEmittedEagerly(Global));
1810  addDeferredDeclToEmit(GD);
1811  } else {
1812  // Otherwise, remember that we saw a deferred decl with this name. The
1813  // first use of the mangled name will cause it to move into
1814  // DeferredDeclsToEmit.
1815  DeferredDecls[MangledName] = GD;
1816  }
1817 }
1818 
1819 // Check if T is a class type with a destructor that's not dllimport.
1821  if (const auto *RT = T->getBaseElementTypeUnsafe()->getAs<RecordType>())
1822  if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()))
1823  if (RD->getDestructor() && !RD->getDestructor()->hasAttr<DLLImportAttr>())
1824  return true;
1825 
1826  return false;
1827 }
1828 
1829 namespace {
1830  struct FunctionIsDirectlyRecursive :
1831  public RecursiveASTVisitor<FunctionIsDirectlyRecursive> {
1832  const StringRef Name;
1833  const Builtin::Context &BI;
1834  bool Result;
1835  FunctionIsDirectlyRecursive(StringRef N, const Builtin::Context &C) :
1836  Name(N), BI(C), Result(false) {
1837  }
1839 
1840  bool TraverseCallExpr(CallExpr *E) {
1841  const FunctionDecl *FD = E->getDirectCallee();
1842  if (!FD)
1843  return true;
1844  AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
1845  if (Attr && Name == Attr->getLabel()) {
1846  Result = true;
1847  return false;
1848  }
1849  unsigned BuiltinID = FD->getBuiltinID();
1850  if (!BuiltinID || !BI.isLibFunction(BuiltinID))
1851  return true;
1852  StringRef BuiltinName = BI.getName(BuiltinID);
1853  if (BuiltinName.startswith("__builtin_") &&
1854  Name == BuiltinName.slice(strlen("__builtin_"), StringRef::npos)) {
1855  Result = true;
1856  return false;
1857  }
1858  return true;
1859  }
1860  };
1861 
1862  // Make sure we're not referencing non-imported vars or functions.
1863  struct DLLImportFunctionVisitor
1864  : public RecursiveASTVisitor<DLLImportFunctionVisitor> {
1865  bool SafeToInline = true;
1866 
1867  bool shouldVisitImplicitCode() const { return true; }
1868 
1869  bool VisitVarDecl(VarDecl *VD) {
1870  if (VD->getTLSKind()) {
1871  // A thread-local variable cannot be imported.
1872  SafeToInline = false;
1873  return SafeToInline;
1874  }
1875 
1876  // A variable definition might imply a destructor call.
1877  if (VD->isThisDeclarationADefinition())
1878  SafeToInline = !HasNonDllImportDtor(VD->getType());
1879 
1880  return SafeToInline;
1881  }
1882 
1883  bool VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) {
1884  if (const auto *D = E->getTemporary()->getDestructor())
1885  SafeToInline = D->hasAttr<DLLImportAttr>();
1886  return SafeToInline;
1887  }
1888 
1889  bool VisitDeclRefExpr(DeclRefExpr *E) {
1890  ValueDecl *VD = E->getDecl();
1891  if (isa<FunctionDecl>(VD))
1892  SafeToInline = VD->hasAttr<DLLImportAttr>();
1893  else if (VarDecl *V = dyn_cast<VarDecl>(VD))
1894  SafeToInline = !V->hasGlobalStorage() || V->hasAttr<DLLImportAttr>();
1895  return SafeToInline;
1896  }
1897 
1898  bool VisitCXXConstructExpr(CXXConstructExpr *E) {
1899  SafeToInline = E->getConstructor()->hasAttr<DLLImportAttr>();
1900  return SafeToInline;
1901  }
1902 
1903  bool VisitCXXMemberCallExpr(CXXMemberCallExpr *E) {
1904  CXXMethodDecl *M = E->getMethodDecl();
1905  if (!M) {
1906  // Call through a pointer to member function. This is safe to inline.
1907  SafeToInline = true;
1908  } else {
1909  SafeToInline = M->hasAttr<DLLImportAttr>();
1910  }
1911  return SafeToInline;
1912  }
1913 
1914  bool VisitCXXDeleteExpr(CXXDeleteExpr *E) {
1915  SafeToInline = E->getOperatorDelete()->hasAttr<DLLImportAttr>();
1916  return SafeToInline;
1917  }
1918 
1919  bool VisitCXXNewExpr(CXXNewExpr *E) {
1920  SafeToInline = E->getOperatorNew()->hasAttr<DLLImportAttr>();
1921  return SafeToInline;
1922  }
1923  };
1924 }
1925 
1926 // isTriviallyRecursive - Check if this function calls another
1927 // decl that, because of the asm attribute or the other decl being a builtin,
1928 // ends up pointing to itself.
1929 bool
1930 CodeGenModule::isTriviallyRecursive(const FunctionDecl *FD) {
1931  StringRef Name;
1932  if (getCXXABI().getMangleContext().shouldMangleDeclName(FD)) {
1933  // asm labels are a special kind of mangling we have to support.
1934  AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
1935  if (!Attr)
1936  return false;
1937  Name = Attr->getLabel();
1938  } else {
1939  Name = FD->getName();
1940  }
1941 
1942  FunctionIsDirectlyRecursive Walker(Name, Context.BuiltinInfo);
1943  Walker.TraverseFunctionDecl(const_cast<FunctionDecl*>(FD));
1944  return Walker.Result;
1945 }
1946 
1947 bool CodeGenModule::shouldEmitFunction(GlobalDecl GD) {
1948  if (getFunctionLinkage(GD) != llvm::Function::AvailableExternallyLinkage)
1949  return true;
1950  const auto *F = cast<FunctionDecl>(GD.getDecl());
1951  if (CodeGenOpts.OptimizationLevel == 0 && !F->hasAttr<AlwaysInlineAttr>())
1952  return false;
1953 
1954  if (F->hasAttr<DLLImportAttr>()) {
1955  // Check whether it would be safe to inline this dllimport function.
1956  DLLImportFunctionVisitor Visitor;
1957  Visitor.TraverseFunctionDecl(const_cast<FunctionDecl*>(F));
1958  if (!Visitor.SafeToInline)
1959  return false;
1960 
1961  if (const CXXDestructorDecl *Dtor = dyn_cast<CXXDestructorDecl>(F)) {
1962  // Implicit destructor invocations aren't captured in the AST, so the
1963  // check above can't see them. Check for them manually here.
1964  for (const Decl *Member : Dtor->getParent()->decls())
1965  if (isa<FieldDecl>(Member))
1966  if (HasNonDllImportDtor(cast<FieldDecl>(Member)->getType()))
1967  return false;
1968  for (const CXXBaseSpecifier &B : Dtor->getParent()->bases())
1969  if (HasNonDllImportDtor(B.getType()))
1970  return false;
1971  }
1972  }
1973 
1974  // PR9614. Avoid cases where the source code is lying to us. An available
1975  // externally function should have an equivalent function somewhere else,
1976  // but a function that calls itself is clearly not equivalent to the real
1977  // implementation.
1978  // This happens in glibc's btowc and in some configure checks.
1979  return !isTriviallyRecursive(F);
1980 }
1981 
1982 bool CodeGenModule::shouldOpportunisticallyEmitVTables() {
1983  return CodeGenOpts.OptimizationLevel > 0;
1984 }
1985 
1986 void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD, llvm::GlobalValue *GV) {
1987  const auto *D = cast<ValueDecl>(GD.getDecl());
1988 
1989  PrettyStackTraceDecl CrashInfo(const_cast<ValueDecl *>(D), D->getLocation(),
1990  Context.getSourceManager(),
1991  "Generating code for declaration");
1992 
1993  if (isa<FunctionDecl>(D)) {
1994  // At -O0, don't generate IR for functions with available_externally
1995  // linkage.
1996  if (!shouldEmitFunction(GD))
1997  return;
1998 
1999  if (const auto *Method = dyn_cast<CXXMethodDecl>(D)) {
2000  // Make sure to emit the definition(s) before we emit the thunks.
2001  // This is necessary for the generation of certain thunks.
2002  if (const auto *CD = dyn_cast<CXXConstructorDecl>(Method))
2003  ABI->emitCXXStructor(CD, getFromCtorType(GD.getCtorType()));
2004  else if (const auto *DD = dyn_cast<CXXDestructorDecl>(Method))
2005  ABI->emitCXXStructor(DD, getFromDtorType(GD.getDtorType()));
2006  else
2007  EmitGlobalFunctionDefinition(GD, GV);
2008 
2009  if (Method->isVirtual())
2010  getVTables().EmitThunks(GD);
2011 
2012  return;
2013  }
2014 
2015  return EmitGlobalFunctionDefinition(GD, GV);
2016  }
2017 
2018  if (const auto *VD = dyn_cast<VarDecl>(D))
2019  return EmitGlobalVarDefinition(VD, !VD->hasDefinition());
2020 
2021  llvm_unreachable("Invalid argument to EmitGlobalDefinition()");
2022 }
2023 
2024 static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old,
2025  llvm::Function *NewFn);
2026 
2027 /// GetOrCreateLLVMFunction - If the specified mangled name is not in the
2028 /// module, create and return an llvm Function with the specified type. If there
2029 /// is something in the module with the specified name, return it potentially
2030 /// bitcasted to the right type.
2031 ///
2032 /// If D is non-null, it specifies a decl that correspond to this. This is used
2033 /// to set the attributes on the function when it is first created.
2034 llvm::Constant *CodeGenModule::GetOrCreateLLVMFunction(
2035  StringRef MangledName, llvm::Type *Ty, GlobalDecl GD, bool ForVTable,
2036  bool DontDefer, bool IsThunk, llvm::AttributeList ExtraAttrs,
2037  ForDefinition_t IsForDefinition) {
2038  const Decl *D = GD.getDecl();
2039 
2040  // Lookup the entry, lazily creating it if necessary.
2041  llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
2042  if (Entry) {
2043  if (WeakRefReferences.erase(Entry)) {
2044  const FunctionDecl *FD = cast_or_null<FunctionDecl>(D);
2045  if (FD && !FD->hasAttr<WeakAttr>())
2046  Entry->setLinkage(llvm::Function::ExternalLinkage);
2047  }
2048 
2049  // Handle dropped DLL attributes.
2050  if (D && !D->hasAttr<DLLImportAttr>() && !D->hasAttr<DLLExportAttr>())
2051  Entry->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
2052 
2053  // If there are two attempts to define the same mangled name, issue an
2054  // error.
2055  if (IsForDefinition && !Entry->isDeclaration()) {
2056  GlobalDecl OtherGD;
2057  // Check that GD is not yet in DiagnosedConflictingDefinitions is required
2058  // to make sure that we issue an error only once.
2059  if (lookupRepresentativeDecl(MangledName, OtherGD) &&
2060  (GD.getCanonicalDecl().getDecl() !=
2061  OtherGD.getCanonicalDecl().getDecl()) &&
2062  DiagnosedConflictingDefinitions.insert(GD).second) {
2063  getDiags().Report(D->getLocation(),
2064  diag::err_duplicate_mangled_name);
2065  getDiags().Report(OtherGD.getDecl()->getLocation(),
2066  diag::note_previous_definition);
2067  }
2068  }
2069 
2070  if ((isa<llvm::Function>(Entry) || isa<llvm::GlobalAlias>(Entry)) &&
2071  (Entry->getType()->getElementType() == Ty)) {
2072  return Entry;
2073  }
2074 
2075  // Make sure the result is of the correct type.
2076  // (If function is requested for a definition, we always need to create a new
2077  // function, not just return a bitcast.)
2078  if (!IsForDefinition)
2079  return llvm::ConstantExpr::getBitCast(Entry, Ty->getPointerTo());
2080  }
2081 
2082  // This function doesn't have a complete type (for example, the return
2083  // type is an incomplete struct). Use a fake type instead, and make
2084  // sure not to try to set attributes.
2085  bool IsIncompleteFunction = false;
2086 
2087  llvm::FunctionType *FTy;
2088  if (isa<llvm::FunctionType>(Ty)) {
2089  FTy = cast<llvm::FunctionType>(Ty);
2090  } else {
2091  FTy = llvm::FunctionType::get(VoidTy, false);
2092  IsIncompleteFunction = true;
2093  }
2094 
2095  llvm::Function *F =
2097  Entry ? StringRef() : MangledName, &getModule());
2098 
2099  // If we already created a function with the same mangled name (but different
2100  // type) before, take its name and add it to the list of functions to be
2101  // replaced with F at the end of CodeGen.
2102  //
2103  // This happens if there is a prototype for a function (e.g. "int f()") and
2104  // then a definition of a different type (e.g. "int f(int x)").
2105  if (Entry) {
2106  F->takeName(Entry);
2107 
2108  // This might be an implementation of a function without a prototype, in
2109  // which case, try to do special replacement of calls which match the new
2110  // prototype. The really key thing here is that we also potentially drop
2111  // arguments from the call site so as to make a direct call, which makes the
2112  // inliner happier and suppresses a number of optimizer warnings (!) about
2113  // dropping arguments.
2114  if (!Entry->use_empty()) {
2116  Entry->removeDeadConstantUsers();
2117  }
2118 
2119  llvm::Constant *BC = llvm::ConstantExpr::getBitCast(
2120  F, Entry->getType()->getElementType()->getPointerTo());
2121  addGlobalValReplacement(Entry, BC);
2122  }
2123 
2124  assert(F->getName() == MangledName && "name was uniqued!");
2125  if (D)
2126  SetFunctionAttributes(GD, F, IsIncompleteFunction, IsThunk);
2127  if (ExtraAttrs.hasAttributes(llvm::AttributeList::FunctionIndex)) {
2128  llvm::AttrBuilder B(ExtraAttrs, llvm::AttributeList::FunctionIndex);
2129  F->addAttributes(llvm::AttributeList::FunctionIndex, B);
2130  }
2131 
2132  if (!DontDefer) {
2133  // All MSVC dtors other than the base dtor are linkonce_odr and delegate to
2134  // each other bottoming out with the base dtor. Therefore we emit non-base
2135  // dtors on usage, even if there is no dtor definition in the TU.
2136  if (D && isa<CXXDestructorDecl>(D) &&
2137  getCXXABI().useThunkForDtorVariant(cast<CXXDestructorDecl>(D),
2138  GD.getDtorType()))
2139  addDeferredDeclToEmit(GD);
2140 
2141  // This is the first use or definition of a mangled name. If there is a
2142  // deferred decl with this name, remember that we need to emit it at the end
2143  // of the file.
2144  auto DDI = DeferredDecls.find(MangledName);
2145  if (DDI != DeferredDecls.end()) {
2146  // Move the potentially referenced deferred decl to the
2147  // DeferredDeclsToEmit list, and remove it from DeferredDecls (since we
2148  // don't need it anymore).
2149  addDeferredDeclToEmit(DDI->second);
2150  DeferredDecls.erase(DDI);
2151 
2152  // Otherwise, there are cases we have to worry about where we're
2153  // using a declaration for which we must emit a definition but where
2154  // we might not find a top-level definition:
2155  // - member functions defined inline in their classes
2156  // - friend functions defined inline in some class
2157  // - special member functions with implicit definitions
2158  // If we ever change our AST traversal to walk into class methods,
2159  // this will be unnecessary.
2160  //
2161  // We also don't emit a definition for a function if it's going to be an
2162  // entry in a vtable, unless it's already marked as used.
2163  } else if (getLangOpts().CPlusPlus && D) {
2164  // Look for a declaration that's lexically in a record.
2165  for (const auto *FD = cast<FunctionDecl>(D)->getMostRecentDecl(); FD;
2166  FD = FD->getPreviousDecl()) {
2167  if (isa<CXXRecordDecl>(FD->getLexicalDeclContext())) {
2168  if (FD->doesThisDeclarationHaveABody()) {
2169  addDeferredDeclToEmit(GD.getWithDecl(FD));
2170  break;
2171  }
2172  }
2173  }
2174  }
2175  }
2176 
2177  // Make sure the result is of the requested type.
2178  if (!IsIncompleteFunction) {
2179  assert(F->getType()->getElementType() == Ty);
2180  return F;
2181  }
2182 
2183  llvm::Type *PTy = llvm::PointerType::getUnqual(Ty);
2184  return llvm::ConstantExpr::getBitCast(F, PTy);
2185 }
2186 
2187 /// GetAddrOfFunction - Return the address of the given function. If Ty is
2188 /// non-null, then this function will use the specified type if it has to
2189 /// create it (this occurs when we see a definition of the function).
2191  llvm::Type *Ty,
2192  bool ForVTable,
2193  bool DontDefer,
2194  ForDefinition_t IsForDefinition) {
2195  // If there was no specific requested type, just convert it now.
2196  if (!Ty) {
2197  const auto *FD = cast<FunctionDecl>(GD.getDecl());
2198  auto CanonTy = Context.getCanonicalType(FD->getType());
2199  Ty = getTypes().ConvertFunctionType(CanonTy, FD);
2200  }
2201 
2202  StringRef MangledName = getMangledName(GD);
2203  return GetOrCreateLLVMFunction(MangledName, Ty, GD, ForVTable, DontDefer,
2204  /*IsThunk=*/false, llvm::AttributeList(),
2205  IsForDefinition);
2206 }
2207 
2208 static const FunctionDecl *
2209 GetRuntimeFunctionDecl(ASTContext &C, StringRef Name) {
2212 
2213  IdentifierInfo &CII = C.Idents.get(Name);
2214  for (const auto &Result : DC->lookup(&CII))
2215  if (const auto FD = dyn_cast<FunctionDecl>(Result))
2216  return FD;
2217 
2218  if (!C.getLangOpts().CPlusPlus)
2219  return nullptr;
2220 
2221  // Demangle the premangled name from getTerminateFn()
2222  IdentifierInfo &CXXII =
2223  (Name == "_ZSt9terminatev" || Name == "\01?terminate@@YAXXZ")
2224  ? C.Idents.get("terminate")
2225  : C.Idents.get(Name);
2226 
2227  for (const auto &N : {"__cxxabiv1", "std"}) {
2228  IdentifierInfo &NS = C.Idents.get(N);
2229  for (const auto &Result : DC->lookup(&NS)) {
2230  NamespaceDecl *ND = dyn_cast<NamespaceDecl>(Result);
2231  if (auto LSD = dyn_cast<LinkageSpecDecl>(Result))
2232  for (const auto &Result : LSD->lookup(&NS))
2233  if ((ND = dyn_cast<NamespaceDecl>(Result)))
2234  break;
2235 
2236  if (ND)
2237  for (const auto &Result : ND->lookup(&CXXII))
2238  if (const auto *FD = dyn_cast<FunctionDecl>(Result))
2239  return FD;
2240  }
2241  }
2242 
2243  return nullptr;
2244 }
2245 
2246 /// CreateRuntimeFunction - Create a new runtime function with the specified
2247 /// type and name.
2248 llvm::Constant *
2249 CodeGenModule::CreateRuntimeFunction(llvm::FunctionType *FTy, StringRef Name,
2250  llvm::AttributeList ExtraAttrs,
2251  bool Local) {
2252  llvm::Constant *C =
2253  GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(), /*ForVTable=*/false,
2254  /*DontDefer=*/false, /*IsThunk=*/false,
2255  ExtraAttrs);
2256 
2257  if (auto *F = dyn_cast<llvm::Function>(C)) {
2258  if (F->empty()) {
2259  F->setCallingConv(getRuntimeCC());
2260 
2261  if (!Local && getTriple().isOSBinFormatCOFF() &&
2262  !getCodeGenOpts().LTOVisibilityPublicStd) {
2263  const FunctionDecl *FD = GetRuntimeFunctionDecl(Context, Name);
2264  if (!FD || FD->hasAttr<DLLImportAttr>()) {
2265  F->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
2266  F->setLinkage(llvm::GlobalValue::ExternalLinkage);
2267  }
2268  }
2269  }
2270  }
2271 
2272  return C;
2273 }
2274 
2275 /// CreateBuiltinFunction - Create a new builtin function with the specified
2276 /// type and name.
2277 llvm::Constant *
2278 CodeGenModule::CreateBuiltinFunction(llvm::FunctionType *FTy, StringRef Name,
2279  llvm::AttributeList ExtraAttrs) {
2280  llvm::Constant *C =
2281  GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(), /*ForVTable=*/false,
2282  /*DontDefer=*/false, /*IsThunk=*/false, ExtraAttrs);
2283  if (auto *F = dyn_cast<llvm::Function>(C))
2284  if (F->empty())
2285  F->setCallingConv(getBuiltinCC());
2286  return C;
2287 }
2288 
2289 /// isTypeConstant - Determine whether an object of this type can be emitted
2290 /// as a constant.
2291 ///
2292 /// If ExcludeCtor is true, the duration when the object's constructor runs
2293 /// will not be considered. The caller will need to verify that the object is
2294 /// not written to during its construction.
2295 bool CodeGenModule::isTypeConstant(QualType Ty, bool ExcludeCtor) {
2296  if (!Ty.isConstant(Context) && !Ty->isReferenceType())
2297  return false;
2298 
2299  if (Context.getLangOpts().CPlusPlus) {
2300  if (const CXXRecordDecl *Record
2301  = Context.getBaseElementType(Ty)->getAsCXXRecordDecl())
2302  return ExcludeCtor && !Record->hasMutableFields() &&
2303  Record->hasTrivialDestructor();
2304  }
2305 
2306  return true;
2307 }
2308 
2309 /// GetOrCreateLLVMGlobal - If the specified mangled name is not in the module,
2310 /// create and return an llvm GlobalVariable with the specified type. If there
2311 /// is something in the module with the specified name, return it potentially
2312 /// bitcasted to the right type.
2313 ///
2314 /// If D is non-null, it specifies a decl that correspond to this. This is used
2315 /// to set the attributes on the global when it is first created.
2316 ///
2317 /// If IsForDefinition is true, it is guranteed that an actual global with
2318 /// type Ty will be returned, not conversion of a variable with the same
2319 /// mangled name but some other type.
2320 llvm::Constant *
2321 CodeGenModule::GetOrCreateLLVMGlobal(StringRef MangledName,
2322  llvm::PointerType *Ty,
2323  const VarDecl *D,
2324  ForDefinition_t IsForDefinition) {
2325  // Lookup the entry, lazily creating it if necessary.
2326  llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
2327  if (Entry) {
2328  if (WeakRefReferences.erase(Entry)) {
2329  if (D && !D->hasAttr<WeakAttr>())
2330  Entry->setLinkage(llvm::Function::ExternalLinkage);
2331  }
2332 
2333  // Handle dropped DLL attributes.
2334  if (D && !D->hasAttr<DLLImportAttr>() && !D->hasAttr<DLLExportAttr>())
2335  Entry->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
2336 
2337  if (Entry->getType() == Ty)
2338  return Entry;
2339 
2340  // If there are two attempts to define the same mangled name, issue an
2341  // error.
2342  if (IsForDefinition && !Entry->isDeclaration()) {
2343  GlobalDecl OtherGD;
2344  const VarDecl *OtherD;
2345 
2346  // Check that D is not yet in DiagnosedConflictingDefinitions is required
2347  // to make sure that we issue an error only once.
2348  if (D && lookupRepresentativeDecl(MangledName, OtherGD) &&
2349  (D->getCanonicalDecl() != OtherGD.getCanonicalDecl().getDecl()) &&
2350  (OtherD = dyn_cast<VarDecl>(OtherGD.getDecl())) &&
2351  OtherD->hasInit() &&
2352  DiagnosedConflictingDefinitions.insert(D).second) {
2353  getDiags().Report(D->getLocation(),
2354  diag::err_duplicate_mangled_name);
2355  getDiags().Report(OtherGD.getDecl()->getLocation(),
2356  diag::note_previous_definition);
2357  }
2358  }
2359 
2360  // Make sure the result is of the correct type.
2361  if (Entry->getType()->getAddressSpace() != Ty->getAddressSpace())
2362  return llvm::ConstantExpr::getAddrSpaceCast(Entry, Ty);
2363 
2364  // (If global is requested for a definition, we always need to create a new
2365  // global, not just return a bitcast.)
2366  if (!IsForDefinition)
2367  return llvm::ConstantExpr::getBitCast(Entry, Ty);
2368  }
2369 
2370  auto AddrSpace = GetGlobalVarAddressSpace(D);
2371  auto TargetAddrSpace = getContext().getTargetAddressSpace(AddrSpace);
2372 
2373  auto *GV = new llvm::GlobalVariable(
2374  getModule(), Ty->getElementType(), false,
2375  llvm::GlobalValue::ExternalLinkage, nullptr, MangledName, nullptr,
2376  llvm::GlobalVariable::NotThreadLocal, TargetAddrSpace);
2377 
2378  // If we already created a global with the same mangled name (but different
2379  // type) before, take its name and remove it from its parent.
2380  if (Entry) {
2381  GV->takeName(Entry);
2382 
2383  if (!Entry->use_empty()) {
2384  llvm::Constant *NewPtrForOldDecl =
2385  llvm::ConstantExpr::getBitCast(GV, Entry->getType());
2386  Entry->replaceAllUsesWith(NewPtrForOldDecl);
2387  }
2388 
2389  Entry->eraseFromParent();
2390  }
2391 
2392  // This is the first use or definition of a mangled name. If there is a
2393  // deferred decl with this name, remember that we need to emit it at the end
2394  // of the file.
2395  auto DDI = DeferredDecls.find(MangledName);
2396  if (DDI != DeferredDecls.end()) {
2397  // Move the potentially referenced deferred decl to the DeferredDeclsToEmit
2398  // list, and remove it from DeferredDecls (since we don't need it anymore).
2399  addDeferredDeclToEmit(DDI->second);
2400  DeferredDecls.erase(DDI);
2401  }
2402 
2403  // Handle things which are present even on external declarations.
2404  if (D) {
2405  // FIXME: This code is overly simple and should be merged with other global
2406  // handling.
2407  GV->setConstant(isTypeConstant(D->getType(), false));
2408 
2409  GV->setAlignment(getContext().getDeclAlign(D).getQuantity());
2410 
2412 
2413  if (D->getTLSKind()) {
2414  if (D->getTLSKind() == VarDecl::TLS_Dynamic)
2415  CXXThreadLocals.push_back(D);
2416  setTLSMode(GV, *D);
2417  }
2418 
2419  // If required by the ABI, treat declarations of static data members with
2420  // inline initializers as definitions.
2421  if (getContext().isMSStaticDataMemberInlineDefinition(D)) {
2422  EmitGlobalVarDefinition(D);
2423  }
2424 
2425  // Handle XCore specific ABI requirements.
2426  if (getTriple().getArch() == llvm::Triple::xcore &&
2428  D->getType().isConstant(Context) &&
2430  GV->setSection(".cp.rodata");
2431  }
2432 
2433  auto ExpectedAS =
2434  D ? D->getType().getAddressSpace()
2435  : static_cast<unsigned>(LangOpts.OpenCL ? LangAS::opencl_global
2436  : LangAS::Default);
2437  assert(getContext().getTargetAddressSpace(ExpectedAS) ==
2438  Ty->getPointerAddressSpace());
2439  if (AddrSpace != ExpectedAS)
2440  return getTargetCodeGenInfo().performAddrSpaceCast(*this, GV, AddrSpace,
2441  ExpectedAS, Ty);
2442 
2443  return GV;
2444 }
2445 
2446 llvm::Constant *
2448  ForDefinition_t IsForDefinition) {
2449  const Decl *D = GD.getDecl();
2450  if (isa<CXXConstructorDecl>(D))
2451  return getAddrOfCXXStructor(cast<CXXConstructorDecl>(D),
2453  /*FnInfo=*/nullptr, /*FnType=*/nullptr,
2454  /*DontDefer=*/false, IsForDefinition);
2455  else if (isa<CXXDestructorDecl>(D))
2456  return getAddrOfCXXStructor(cast<CXXDestructorDecl>(D),
2458  /*FnInfo=*/nullptr, /*FnType=*/nullptr,
2459  /*DontDefer=*/false, IsForDefinition);
2460  else if (isa<CXXMethodDecl>(D)) {
2461  auto FInfo = &getTypes().arrangeCXXMethodDeclaration(
2462  cast<CXXMethodDecl>(D));
2463  auto Ty = getTypes().GetFunctionType(*FInfo);
2464  return GetAddrOfFunction(GD, Ty, /*ForVTable=*/false, /*DontDefer=*/false,
2465  IsForDefinition);
2466  } else if (isa<FunctionDecl>(D)) {
2468  llvm::FunctionType *Ty = getTypes().GetFunctionType(FI);
2469  return GetAddrOfFunction(GD, Ty, /*ForVTable=*/false, /*DontDefer=*/false,
2470  IsForDefinition);
2471  } else
2472  return GetAddrOfGlobalVar(cast<VarDecl>(D), /*Ty=*/nullptr,
2473  IsForDefinition);
2474 }
2475 
2476 llvm::GlobalVariable *
2478  llvm::Type *Ty,
2479  llvm::GlobalValue::LinkageTypes Linkage) {
2480  llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name);
2481  llvm::GlobalVariable *OldGV = nullptr;
2482 
2483  if (GV) {
2484  // Check if the variable has the right type.
2485  if (GV->getType()->getElementType() == Ty)
2486  return GV;
2487 
2488  // Because C++ name mangling, the only way we can end up with an already
2489  // existing global with the same name is if it has been declared extern "C".
2490  assert(GV->isDeclaration() && "Declaration has wrong type!");
2491  OldGV = GV;
2492  }
2493 
2494  // Create a new variable.
2495  GV = new llvm::GlobalVariable(getModule(), Ty, /*isConstant=*/true,
2496  Linkage, nullptr, Name);
2497 
2498  if (OldGV) {
2499  // Replace occurrences of the old variable if needed.
2500  GV->takeName(OldGV);
2501 
2502  if (!OldGV->use_empty()) {
2503  llvm::Constant *NewPtrForOldDecl =
2504  llvm::ConstantExpr::getBitCast(GV, OldGV->getType());
2505  OldGV->replaceAllUsesWith(NewPtrForOldDecl);
2506  }
2507 
2508  OldGV->eraseFromParent();
2509  }
2510 
2511  if (supportsCOMDAT() && GV->isWeakForLinker() &&
2512  !GV->hasAvailableExternallyLinkage())
2513  GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
2514 
2515  return GV;
2516 }
2517 
2518 /// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the
2519 /// given global variable. If Ty is non-null and if the global doesn't exist,
2520 /// then it will be created with the specified type instead of whatever the
2521 /// normal requested type would be. If IsForDefinition is true, it is guranteed
2522 /// that an actual global with type Ty will be returned, not conversion of a
2523 /// variable with the same mangled name but some other type.
2525  llvm::Type *Ty,
2526  ForDefinition_t IsForDefinition) {
2527  assert(D->hasGlobalStorage() && "Not a global variable");
2528  QualType ASTTy = D->getType();
2529  if (!Ty)
2530  Ty = getTypes().ConvertTypeForMem(ASTTy);
2531 
2532  llvm::PointerType *PTy =
2533  llvm::PointerType::get(Ty, getContext().getTargetAddressSpace(ASTTy));
2534 
2535  StringRef MangledName = getMangledName(D);
2536  return GetOrCreateLLVMGlobal(MangledName, PTy, D, IsForDefinition);
2537 }
2538 
2539 /// CreateRuntimeVariable - Create a new runtime global variable with the
2540 /// specified type and name.
2541 llvm::Constant *
2543  StringRef Name) {
2544  return GetOrCreateLLVMGlobal(Name, llvm::PointerType::getUnqual(Ty), nullptr);
2545 }
2546 
2548  assert(!D->getInit() && "Cannot emit definite definitions here!");
2549 
2550  StringRef MangledName = getMangledName(D);
2551  llvm::GlobalValue *GV = GetGlobalValue(MangledName);
2552 
2553  // We already have a definition, not declaration, with the same mangled name.
2554  // Emitting of declaration is not required (and actually overwrites emitted
2555  // definition).
2556  if (GV && !GV->isDeclaration())
2557  return;
2558 
2559  // If we have not seen a reference to this variable yet, place it into the
2560  // deferred declarations table to be emitted if needed later.
2561  if (!MustBeEmitted(D) && !GV) {
2562  DeferredDecls[MangledName] = D;
2563  return;
2564  }
2565 
2566  // The tentative definition is the only definition.
2567  EmitGlobalVarDefinition(D);
2568 }
2569 
2571  return Context.toCharUnitsFromBits(
2572  getDataLayout().getTypeStoreSizeInBits(Ty));
2573 }
2574 
2576  unsigned AddrSpace;
2577  if (LangOpts.OpenCL) {
2578  AddrSpace = D ? D->getType().getAddressSpace()
2579  : static_cast<unsigned>(LangAS::opencl_global);
2580  assert(AddrSpace == LangAS::opencl_global ||
2581  AddrSpace == LangAS::opencl_constant ||
2582  AddrSpace == LangAS::opencl_local ||
2583  AddrSpace >= LangAS::FirstTargetAddressSpace);
2584  return AddrSpace;
2585  }
2586 
2587  if (LangOpts.CUDA && LangOpts.CUDAIsDevice) {
2588  if (D && D->hasAttr<CUDAConstantAttr>())
2589  return LangAS::cuda_constant;
2590  else if (D && D->hasAttr<CUDASharedAttr>())
2591  return LangAS::cuda_shared;
2592  else
2593  return LangAS::cuda_device;
2594  }
2595 
2597 }
2598 
2599 template<typename SomeDecl>
2601  llvm::GlobalValue *GV) {
2602  if (!getLangOpts().CPlusPlus)
2603  return;
2604 
2605  // Must have 'used' attribute, or else inline assembly can't rely on
2606  // the name existing.
2607  if (!D->template hasAttr<UsedAttr>())
2608  return;
2609 
2610  // Must have internal linkage and an ordinary name.
2611  if (!D->getIdentifier() || D->getFormalLinkage() != InternalLinkage)
2612  return;
2613 
2614  // Must be in an extern "C" context. Entities declared directly within
2615  // a record are not extern "C" even if the record is in such a context.
2616  const SomeDecl *First = D->getFirstDecl();
2617  if (First->getDeclContext()->isRecord() || !First->isInExternCContext())
2618  return;
2619 
2620  // OK, this is an internal linkage entity inside an extern "C" linkage
2621  // specification. Make a note of that so we can give it the "expected"
2622  // mangled name if nothing else is using that name.
2623  std::pair<StaticExternCMap::iterator, bool> R =
2624  StaticExternCValues.insert(std::make_pair(D->getIdentifier(), GV));
2625 
2626  // If we have multiple internal linkage entities with the same name
2627  // in extern "C" regions, none of them gets that name.
2628  if (!R.second)
2629  R.first->second = nullptr;
2630 }
2631 
2632 static bool shouldBeInCOMDAT(CodeGenModule &CGM, const Decl &D) {
2633  if (!CGM.supportsCOMDAT())
2634  return false;
2635 
2636  if (D.hasAttr<SelectAnyAttr>())
2637  return true;
2638 
2640  if (auto *VD = dyn_cast<VarDecl>(&D))
2641  Linkage = CGM.getContext().GetGVALinkageForVariable(VD);
2642  else
2643  Linkage = CGM.getContext().GetGVALinkageForFunction(cast<FunctionDecl>(&D));
2644 
2645  switch (Linkage) {
2646  case GVA_Internal:
2648  case GVA_StrongExternal:
2649  return false;
2650  case GVA_DiscardableODR:
2651  case GVA_StrongODR:
2652  return true;
2653  }
2654  llvm_unreachable("No such linkage");
2655 }
2656 
2658  llvm::GlobalObject &GO) {
2659  if (!shouldBeInCOMDAT(*this, D))
2660  return;
2661  GO.setComdat(TheModule.getOrInsertComdat(GO.getName()));
2662 }
2663 
2664 /// Pass IsTentative as true if you want to create a tentative definition.
2665 void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D,
2666  bool IsTentative) {
2667  // OpenCL global variables of sampler type are translated to function calls,
2668  // therefore no need to be translated.
2669  QualType ASTTy = D->getType();
2670  if (getLangOpts().OpenCL && ASTTy->isSamplerT())
2671  return;
2672 
2673  llvm::Constant *Init = nullptr;
2675  bool NeedsGlobalCtor = false;
2676  bool NeedsGlobalDtor = RD && !RD->hasTrivialDestructor();
2677 
2678  const VarDecl *InitDecl;
2679  const Expr *InitExpr = D->getAnyInitializer(InitDecl);
2680 
2681  // CUDA E.2.4.1 "__shared__ variables cannot have an initialization
2682  // as part of their declaration." Sema has already checked for
2683  // error cases, so we just need to set Init to UndefValue.
2684  if (getLangOpts().CUDA && getLangOpts().CUDAIsDevice &&
2685  D->hasAttr<CUDASharedAttr>())
2686  Init = llvm::UndefValue::get(getTypes().ConvertType(ASTTy));
2687  else if (!InitExpr) {
2688  // This is a tentative definition; tentative definitions are
2689  // implicitly initialized with { 0 }.
2690  //
2691  // Note that tentative definitions are only emitted at the end of
2692  // a translation unit, so they should never have incomplete
2693  // type. In addition, EmitTentativeDefinition makes sure that we
2694  // never attempt to emit a tentative definition if a real one
2695  // exists. A use may still exists, however, so we still may need
2696  // to do a RAUW.
2697  assert(!ASTTy->isIncompleteType() && "Unexpected incomplete type");
2698  Init = EmitNullConstant(D->getType());
2699  } else {
2700  initializedGlobalDecl = GlobalDecl(D);
2701  Init = EmitConstantInit(*InitDecl);
2702 
2703  if (!Init) {
2704  QualType T = InitExpr->getType();
2705  if (D->getType()->isReferenceType())
2706  T = D->getType();
2707 
2708  if (getLangOpts().CPlusPlus) {
2709  Init = EmitNullConstant(T);
2710  NeedsGlobalCtor = true;
2711  } else {
2712  ErrorUnsupported(D, "static initializer");
2713  Init = llvm::UndefValue::get(getTypes().ConvertType(T));
2714  }
2715  } else {
2716  // We don't need an initializer, so remove the entry for the delayed
2717  // initializer position (just in case this entry was delayed) if we
2718  // also don't need to register a destructor.
2719  if (getLangOpts().CPlusPlus && !NeedsGlobalDtor)
2720  DelayedCXXInitPosition.erase(D);
2721  }
2722  }
2723 
2724  llvm::Type* InitType = Init->getType();
2725  llvm::Constant *Entry =
2726  GetAddrOfGlobalVar(D, InitType, ForDefinition_t(!IsTentative));
2727 
2728  // Strip off a bitcast if we got one back.
2729  if (auto *CE = dyn_cast<llvm::ConstantExpr>(Entry)) {
2730  assert(CE->getOpcode() == llvm::Instruction::BitCast ||
2731  CE->getOpcode() == llvm::Instruction::AddrSpaceCast ||
2732  // All zero index gep.
2733  CE->getOpcode() == llvm::Instruction::GetElementPtr);
2734  Entry = CE->getOperand(0);
2735  }
2736 
2737  // Entry is now either a Function or GlobalVariable.
2738  auto *GV = dyn_cast<llvm::GlobalVariable>(Entry);
2739 
2740  // We have a definition after a declaration with the wrong type.
2741  // We must make a new GlobalVariable* and update everything that used OldGV
2742  // (a declaration or tentative definition) with the new GlobalVariable*
2743  // (which will be a definition).
2744  //
2745  // This happens if there is a prototype for a global (e.g.
2746  // "extern int x[];") and then a definition of a different type (e.g.
2747  // "int x[10];"). This also happens when an initializer has a different type
2748  // from the type of the global (this happens with unions).
2749  if (!GV || GV->getType()->getElementType() != InitType ||
2750  GV->getType()->getAddressSpace() !=
2752 
2753  // Move the old entry aside so that we'll create a new one.
2754  Entry->setName(StringRef());
2755 
2756  // Make a new global with the correct type, this is now guaranteed to work.
2757  GV = cast<llvm::GlobalVariable>(
2758  GetAddrOfGlobalVar(D, InitType, ForDefinition_t(!IsTentative)));
2759 
2760  // Replace all uses of the old global with the new global
2761  llvm::Constant *NewPtrForOldDecl =
2762  llvm::ConstantExpr::getBitCast(GV, Entry->getType());
2763  Entry->replaceAllUsesWith(NewPtrForOldDecl);
2764 
2765  // Erase the old global, since it is no longer used.
2766  cast<llvm::GlobalValue>(Entry)->eraseFromParent();
2767  }
2768 
2770 
2771  if (D->hasAttr<AnnotateAttr>())
2772  AddGlobalAnnotations(D, GV);
2773 
2774  // Set the llvm linkage type as appropriate.
2775  llvm::GlobalValue::LinkageTypes Linkage =
2776  getLLVMLinkageVarDefinition(D, GV->isConstant());
2777 
2778  // CUDA B.2.1 "The __device__ qualifier declares a variable that resides on
2779  // the device. [...]"
2780  // CUDA B.2.2 "The __constant__ qualifier, optionally used together with
2781  // __device__, declares a variable that: [...]
2782  // Is accessible from all the threads within the grid and from the host
2783  // through the runtime library (cudaGetSymbolAddress() / cudaGetSymbolSize()
2784  // / cudaMemcpyToSymbol() / cudaMemcpyFromSymbol())."
2785  if (GV && LangOpts.CUDA) {
2786  if (LangOpts.CUDAIsDevice) {
2787  if (D->hasAttr<CUDADeviceAttr>() || D->hasAttr<CUDAConstantAttr>())
2788  GV->setExternallyInitialized(true);
2789  } else {
2790  // Host-side shadows of external declarations of device-side
2791  // global variables become internal definitions. These have to
2792  // be internal in order to prevent name conflicts with global
2793  // host variables with the same name in a different TUs.
2794  if (D->hasAttr<CUDADeviceAttr>() || D->hasAttr<CUDAConstantAttr>()) {
2796 
2797  // Shadow variables and their properties must be registered
2798  // with CUDA runtime.
2799  unsigned Flags = 0;
2800  if (!D->hasDefinition())
2802  if (D->hasAttr<CUDAConstantAttr>())
2804  getCUDARuntime().registerDeviceVar(*GV, Flags);
2805  } else if (D->hasAttr<CUDASharedAttr>())
2806  // __shared__ variables are odd. Shadows do get created, but
2807  // they are not registered with the CUDA runtime, so they
2808  // can't really be used to access their device-side
2809  // counterparts. It's not clear yet whether it's nvcc's bug or
2810  // a feature, but we've got to do the same for compatibility.
2812  }
2813  }
2814  GV->setInitializer(Init);
2815 
2816  // If it is safe to mark the global 'constant', do so now.
2817  GV->setConstant(!NeedsGlobalCtor && !NeedsGlobalDtor &&
2818  isTypeConstant(D->getType(), true));
2819 
2820  // If it is in a read-only section, mark it 'constant'.
2821  if (const SectionAttr *SA = D->getAttr<SectionAttr>()) {
2822  const ASTContext::SectionInfo &SI = Context.SectionInfos[SA->getName()];
2823  if ((SI.SectionFlags & ASTContext::PSF_Write) == 0)
2824  GV->setConstant(true);
2825  }
2826 
2827  GV->setAlignment(getContext().getDeclAlign(D).getQuantity());
2828 
2829 
2830  // On Darwin, if the normal linkage of a C++ thread_local variable is
2831  // LinkOnce or Weak, we keep the normal linkage to prevent multiple
2832  // copies within a linkage unit; otherwise, the backing variable has
2833  // internal linkage and all accesses should just be calls to the
2834  // Itanium-specified entry point, which has the normal linkage of the
2835  // variable. This is to preserve the ability to change the implementation
2836  // behind the scenes.
2837  if (!D->isStaticLocal() && D->getTLSKind() == VarDecl::TLS_Dynamic &&
2838  Context.getTargetInfo().getTriple().isOSDarwin() &&
2839  !llvm::GlobalVariable::isLinkOnceLinkage(Linkage) &&
2840  !llvm::GlobalVariable::isWeakLinkage(Linkage))
2842 
2843  GV->setLinkage(Linkage);
2844  if (D->hasAttr<DLLImportAttr>())
2845  GV->setDLLStorageClass(llvm::GlobalVariable::DLLImportStorageClass);
2846  else if (D->hasAttr<DLLExportAttr>())
2847  GV->setDLLStorageClass(llvm::GlobalVariable::DLLExportStorageClass);
2848  else
2849  GV->setDLLStorageClass(llvm::GlobalVariable::DefaultStorageClass);
2850 
2851  if (Linkage == llvm::GlobalVariable::CommonLinkage) {
2852  // common vars aren't constant even if declared const.
2853  GV->setConstant(false);
2854  // Tentative definition of global variables may be initialized with
2855  // non-zero null pointers. In this case they should have weak linkage
2856  // since common linkage must have zero initializer and must not have
2857  // explicit section therefore cannot have non-zero initial value.
2858  if (!GV->getInitializer()->isNullValue())
2859  GV->setLinkage(llvm::GlobalVariable::WeakAnyLinkage);
2860  }
2861 
2862  setNonAliasAttributes(D, GV);
2863 
2864  if (D->getTLSKind() && !GV->isThreadLocal()) {
2865  if (D->getTLSKind() == VarDecl::TLS_Dynamic)
2866  CXXThreadLocals.push_back(D);
2867  setTLSMode(GV, *D);
2868  }
2869 
2870  maybeSetTrivialComdat(*D, *GV);
2871 
2872  // Emit the initializer function if necessary.
2873  if (NeedsGlobalCtor || NeedsGlobalDtor)
2874  EmitCXXGlobalVarDeclInitFunc(D, GV, NeedsGlobalCtor);
2875 
2876  SanitizerMD->reportGlobalToASan(GV, *D, NeedsGlobalCtor);
2877 
2878  // Emit global variable debug information.
2879  if (CGDebugInfo *DI = getModuleDebugInfo())
2880  if (getCodeGenOpts().getDebugInfo() >= codegenoptions::LimitedDebugInfo)
2881  DI->EmitGlobalVariable(GV, D);
2882 }
2883 
2885  CodeGenModule &CGM, const VarDecl *D,
2886  bool NoCommon) {
2887  // Don't give variables common linkage if -fno-common was specified unless it
2888  // was overridden by a NoCommon attribute.
2889  if ((NoCommon || D->hasAttr<NoCommonAttr>()) && !D->hasAttr<CommonAttr>())
2890  return true;
2891 
2892  // C11 6.9.2/2:
2893  // A declaration of an identifier for an object that has file scope without
2894  // an initializer, and without a storage-class specifier or with the
2895  // storage-class specifier static, constitutes a tentative definition.
2896  if (D->getInit() || D->hasExternalStorage())
2897  return true;
2898 
2899  // A variable cannot be both common and exist in a section.
2900  if (D->hasAttr<SectionAttr>())
2901  return true;
2902 
2903  // A variable cannot be both common and exist in a section.
2904  // We dont try to determine which is the right section in the front-end.
2905  // If no specialized section name is applicable, it will resort to default.
2906  if (D->hasAttr<PragmaClangBSSSectionAttr>() ||
2907  D->hasAttr<PragmaClangDataSectionAttr>() ||
2908  D->hasAttr<PragmaClangRodataSectionAttr>())
2909  return true;
2910 
2911  // Thread local vars aren't considered common linkage.
2912  if (D->getTLSKind())
2913  return true;
2914 
2915  // Tentative definitions marked with WeakImportAttr are true definitions.
2916  if (D->hasAttr<WeakImportAttr>())
2917  return true;
2918 
2919  // A variable cannot be both common and exist in a comdat.
2920  if (shouldBeInCOMDAT(CGM, *D))
2921  return true;
2922 
2923  // Declarations with a required alignment do not have common linkage in MSVC
2924  // mode.
2925  if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
2926  if (D->hasAttr<AlignedAttr>())
2927  return true;
2928  QualType VarType = D->getType();
2929  if (Context.isAlignmentRequired(VarType))
2930  return true;
2931 
2932  if (const auto *RT = VarType->getAs<RecordType>()) {
2933  const RecordDecl *RD = RT->getDecl();
2934  for (const FieldDecl *FD : RD->fields()) {
2935  if (FD->isBitField())
2936  continue;
2937  if (FD->hasAttr<AlignedAttr>())
2938  return true;
2939  if (Context.isAlignmentRequired(FD->getType()))
2940  return true;
2941  }
2942  }
2943  }
2944 
2945  return false;
2946 }
2947 
2948 llvm::GlobalValue::LinkageTypes CodeGenModule::getLLVMLinkageForDeclarator(
2949  const DeclaratorDecl *D, GVALinkage Linkage, bool IsConstantVariable) {
2950  if (Linkage == GVA_Internal)
2952 
2953  if (D->hasAttr<WeakAttr>()) {
2954  if (IsConstantVariable)
2955  return llvm::GlobalVariable::WeakODRLinkage;
2956  else
2957  return llvm::GlobalVariable::WeakAnyLinkage;
2958  }
2959 
2960  // We are guaranteed to have a strong definition somewhere else,
2961  // so we can use available_externally linkage.
2962  if (Linkage == GVA_AvailableExternally)
2963  return llvm::GlobalValue::AvailableExternallyLinkage;
2964 
2965  // Note that Apple's kernel linker doesn't support symbol
2966  // coalescing, so we need to avoid linkonce and weak linkages there.
2967  // Normally, this means we just map to internal, but for explicit
2968  // instantiations we'll map to external.
2969 
2970  // In C++, the compiler has to emit a definition in every translation unit
2971  // that references the function. We should use linkonce_odr because
2972  // a) if all references in this translation unit are optimized away, we
2973  // don't need to codegen it. b) if the function persists, it needs to be
2974  // merged with other definitions. c) C++ has the ODR, so we know the
2975  // definition is dependable.
2976  if (Linkage == GVA_DiscardableODR)
2977  return !Context.getLangOpts().AppleKext ? llvm::Function::LinkOnceODRLinkage
2979 
2980  // An explicit instantiation of a template has weak linkage, since
2981  // explicit instantiations can occur in multiple translation units
2982  // and must all be equivalent. However, we are not allowed to
2983  // throw away these explicit instantiations.
2984  //
2985  // We don't currently support CUDA device code spread out across multiple TUs,
2986  // so say that CUDA templates are either external (for kernels) or internal.
2987  // This lets llvm perform aggressive inter-procedural optimizations.
2988  if (Linkage == GVA_StrongODR) {
2989  if (Context.getLangOpts().AppleKext)
2991  if (Context.getLangOpts().CUDA && Context.getLangOpts().CUDAIsDevice)
2992  return D->hasAttr<CUDAGlobalAttr>() ? llvm::Function::ExternalLinkage
2994  return llvm::Function::WeakODRLinkage;
2995  }
2996 
2997  // C++ doesn't have tentative definitions and thus cannot have common
2998  // linkage.
2999  if (!getLangOpts().CPlusPlus && isa<VarDecl>(D) &&
3000  !isVarDeclStrongDefinition(Context, *this, cast<VarDecl>(D),
3001  CodeGenOpts.NoCommon))
3002  return llvm::GlobalVariable::CommonLinkage;
3003 
3004  // selectany symbols are externally visible, so use weak instead of
3005  // linkonce. MSVC optimizes away references to const selectany globals, so
3006  // all definitions should be the same and ODR linkage should be used.
3007  // http://msdn.microsoft.com/en-us/library/5tkz6s71.aspx
3008  if (D->hasAttr<SelectAnyAttr>())
3009  return llvm::GlobalVariable::WeakODRLinkage;
3010 
3011  // Otherwise, we have strong external linkage.
3012  assert(Linkage == GVA_StrongExternal);
3014 }
3015 
3016 llvm::GlobalValue::LinkageTypes CodeGenModule::getLLVMLinkageVarDefinition(
3017  const VarDecl *VD, bool IsConstant) {
3019  return getLLVMLinkageForDeclarator(VD, Linkage, IsConstant);
3020 }
3021 
3022 /// Replace the uses of a function that was declared with a non-proto type.
3023 /// We want to silently drop extra arguments from call sites
3024 static void replaceUsesOfNonProtoConstant(llvm::Constant *old,
3025  llvm::Function *newFn) {
3026  // Fast path.
3027  if (old->use_empty()) return;
3028 
3029  llvm::Type *newRetTy = newFn->getReturnType();
3032 
3033  for (llvm::Value::use_iterator ui = old->use_begin(), ue = old->use_end();
3034  ui != ue; ) {
3035  llvm::Value::use_iterator use = ui++; // Increment before the use is erased.
3036  llvm::User *user = use->getUser();
3037 
3038  // Recognize and replace uses of bitcasts. Most calls to
3039  // unprototyped functions will use bitcasts.
3040  if (auto *bitcast = dyn_cast<llvm::ConstantExpr>(user)) {
3041  if (bitcast->getOpcode() == llvm::Instruction::BitCast)
3042  replaceUsesOfNonProtoConstant(bitcast, newFn);
3043  continue;
3044  }
3045 
3046  // Recognize calls to the function.
3047  llvm::CallSite callSite(user);
3048  if (!callSite) continue;
3049  if (!callSite.isCallee(&*use)) continue;
3050 
3051  // If the return types don't match exactly, then we can't
3052  // transform this call unless it's dead.
3053  if (callSite->getType() != newRetTy && !callSite->use_empty())
3054  continue;
3055 
3056  // Get the call site's attribute list.
3058  llvm::AttributeList oldAttrs = callSite.getAttributes();
3059 
3060  // If the function was passed too few arguments, don't transform.
3061  unsigned newNumArgs = newFn->arg_size();
3062  if (callSite.arg_size() < newNumArgs) continue;
3063 
3064  // If extra arguments were passed, we silently drop them.
3065  // If any of the types mismatch, we don't transform.
3066  unsigned argNo = 0;
3067  bool dontTransform = false;
3068  for (llvm::Argument &A : newFn->args()) {
3069  if (callSite.getArgument(argNo)->getType() != A.getType()) {
3070  dontTransform = true;
3071  break;
3072  }
3073 
3074  // Add any parameter attributes.
3075  newArgAttrs.push_back(oldAttrs.getParamAttributes(argNo));
3076  argNo++;
3077  }
3078  if (dontTransform)
3079  continue;
3080 
3081  // Okay, we can transform this. Create the new call instruction and copy
3082  // over the required information.
3083  newArgs.append(callSite.arg_begin(), callSite.arg_begin() + argNo);
3084 
3085  // Copy over any operand bundles.
3086  callSite.getOperandBundlesAsDefs(newBundles);
3087 
3088  llvm::CallSite newCall;
3089  if (callSite.isCall()) {
3090  newCall = llvm::CallInst::Create(newFn, newArgs, newBundles, "",
3091  callSite.getInstruction());
3092  } else {
3093  auto *oldInvoke = cast<llvm::InvokeInst>(callSite.getInstruction());
3094  newCall = llvm::InvokeInst::Create(newFn,
3095  oldInvoke->getNormalDest(),
3096  oldInvoke->getUnwindDest(),
3097  newArgs, newBundles, "",
3098  callSite.getInstruction());
3099  }
3100  newArgs.clear(); // for the next iteration
3101 
3102  if (!newCall->getType()->isVoidTy())
3103  newCall->takeName(callSite.getInstruction());
3104  newCall.setAttributes(llvm::AttributeList::get(
3105  newFn->getContext(), oldAttrs.getFnAttributes(),
3106  oldAttrs.getRetAttributes(), newArgAttrs));
3107  newCall.setCallingConv(callSite.getCallingConv());
3108 
3109  // Finally, remove the old call, replacing any uses with the new one.
3110  if (!callSite->use_empty())
3111  callSite->replaceAllUsesWith(newCall.getInstruction());
3112 
3113  // Copy debug location attached to CI.
3114  if (callSite->getDebugLoc())
3115  newCall->setDebugLoc(callSite->getDebugLoc());
3116 
3117  callSite->eraseFromParent();
3118  }
3119 }
3120 
3121 /// ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we
3122 /// implement a function with no prototype, e.g. "int foo() {}". If there are
3123 /// existing call uses of the old function in the module, this adjusts them to
3124 /// call the new function directly.
3125 ///
3126 /// This is not just a cleanup: the always_inline pass requires direct calls to
3127 /// functions to be able to inline them. If there is a bitcast in the way, it
3128 /// won't inline them. Instcombine normally deletes these calls, but it isn't
3129 /// run at -O0.
3130 static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old,
3131  llvm::Function *NewFn) {
3132  // If we're redefining a global as a function, don't transform it.
3133  if (!isa<llvm::Function>(Old)) return;
3134 
3135  replaceUsesOfNonProtoConstant(Old, NewFn);
3136 }
3137 
3139  auto DK = VD->isThisDeclarationADefinition();
3140  if (DK == VarDecl::Definition && VD->hasAttr<DLLImportAttr>())
3141  return;
3142 
3144  // If we have a definition, this might be a deferred decl. If the
3145  // instantiation is explicit, make sure we emit it at the end.
3147  GetAddrOfGlobalVar(VD);
3148 
3149  EmitTopLevelDecl(VD);
3150 }
3151 
3152 void CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD,
3153  llvm::GlobalValue *GV) {
3154  const auto *D = cast<FunctionDecl>(GD.getDecl());
3155 
3156  // Compute the function info and LLVM type.
3158  llvm::FunctionType *Ty = getTypes().GetFunctionType(FI);
3159 
3160  // Get or create the prototype for the function.
3161  if (!GV || (GV->getType()->getElementType() != Ty))
3162  GV = cast<llvm::GlobalValue>(GetAddrOfFunction(GD, Ty, /*ForVTable=*/false,
3163  /*DontDefer=*/true,
3164  ForDefinition));
3165 
3166  // Already emitted.
3167  if (!GV->isDeclaration())
3168  return;
3169 
3170  // We need to set linkage and visibility on the function before
3171  // generating code for it because various parts of IR generation
3172  // want to propagate this information down (e.g. to local static
3173  // declarations).
3174  auto *Fn = cast<llvm::Function>(GV);
3175  setFunctionLinkage(GD, Fn);
3177 
3178  // FIXME: this is redundant with part of setFunctionDefinitionAttributes
3179  setGlobalVisibility(Fn, D);
3180 
3182 
3183  maybeSetTrivialComdat(*D, *Fn);
3184 
3185  CodeGenFunction(*this).GenerateCode(D, Fn, FI);
3186 
3189 
3190  if (const ConstructorAttr *CA = D->getAttr<ConstructorAttr>())
3191  AddGlobalCtor(Fn, CA->getPriority());
3192  if (const DestructorAttr *DA = D->getAttr<DestructorAttr>())
3193  AddGlobalDtor(Fn, DA->getPriority());
3194  if (D->hasAttr<AnnotateAttr>())
3195  AddGlobalAnnotations(D, Fn);
3196 }
3197 
3198 void CodeGenModule::EmitAliasDefinition(GlobalDecl GD) {
3199  const auto *D = cast<ValueDecl>(GD.getDecl());
3200  const AliasAttr *AA = D->getAttr<AliasAttr>();
3201  assert(AA && "Not an alias?");
3202 
3203  StringRef MangledName = getMangledName(GD);
3204 
3205  if (AA->getAliasee() == MangledName) {
3206  Diags.Report(AA->getLocation(), diag::err_cyclic_alias) << 0;
3207  return;
3208  }
3209 
3210  // If there is a definition in the module, then it wins over the alias.
3211  // This is dubious, but allow it to be safe. Just ignore the alias.
3212  llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
3213  if (Entry && !Entry->isDeclaration())
3214  return;
3215 
3216  Aliases.push_back(GD);
3217 
3218  llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType());
3219 
3220  // Create a reference to the named value. This ensures that it is emitted
3221  // if a deferred decl.
3222  llvm::Constant *Aliasee;
3223  if (isa<llvm::FunctionType>(DeclTy))
3224  Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy, GD,
3225  /*ForVTable=*/false);
3226  else
3227  Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
3228  llvm::PointerType::getUnqual(DeclTy),
3229  /*D=*/nullptr);
3230 
3231  // Create the new alias itself, but don't set a name yet.
3232  auto *GA = llvm::GlobalAlias::create(
3233  DeclTy, 0, llvm::Function::ExternalLinkage, "", Aliasee, &getModule());
3234 
3235  if (Entry) {
3236  if (GA->getAliasee() == Entry) {
3237  Diags.Report(AA->getLocation(), diag::err_cyclic_alias) << 0;
3238  return;
3239  }
3240 
3241  assert(Entry->isDeclaration());
3242 
3243  // If there is a declaration in the module, then we had an extern followed
3244  // by the alias, as in:
3245  // extern int test6();
3246  // ...
3247  // int test6() __attribute__((alias("test7")));
3248  //
3249  // Remove it and replace uses of it with the alias.
3250  GA->takeName(Entry);
3251 
3252  Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GA,
3253  Entry->getType()));
3254  Entry->eraseFromParent();
3255  } else {
3256  GA->setName(MangledName);
3257  }
3258 
3259  // Set attributes which are particular to an alias; this is a
3260  // specialization of the attributes which may be set on a global
3261  // variable/function.
3262  if (D->hasAttr<WeakAttr>() || D->hasAttr<WeakRefAttr>() ||
3263  D->isWeakImported()) {
3264  GA->setLinkage(llvm::Function::WeakAnyLinkage);
3265  }
3266 
3267  if (const auto *VD = dyn_cast<VarDecl>(D))
3268  if (VD->getTLSKind())
3269  setTLSMode(GA, *VD);
3270 
3271  setAliasAttributes(D, GA);
3272 }
3273 
3274 void CodeGenModule::emitIFuncDefinition(GlobalDecl GD) {
3275  const auto *D = cast<ValueDecl>(GD.getDecl());
3276  const IFuncAttr *IFA = D->getAttr<IFuncAttr>();
3277  assert(IFA && "Not an ifunc?");
3278 
3279  StringRef MangledName = getMangledName(GD);
3280 
3281  if (IFA->getResolver() == MangledName) {
3282  Diags.Report(IFA->getLocation(), diag::err_cyclic_alias) << 1;
3283  return;
3284  }
3285 
3286  // Report an error if some definition overrides ifunc.
3287  llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
3288  if (Entry && !Entry->isDeclaration()) {
3289  GlobalDecl OtherGD;
3290  if (lookupRepresentativeDecl(MangledName, OtherGD) &&
3291  DiagnosedConflictingDefinitions.insert(GD).second) {
3292  Diags.Report(D->getLocation(), diag::err_duplicate_mangled_name);
3293  Diags.Report(OtherGD.getDecl()->getLocation(),
3294  diag::note_previous_definition);
3295  }
3296  return;
3297  }
3298 
3299  Aliases.push_back(GD);
3300 
3301  llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType());
3302  llvm::Constant *Resolver =
3303  GetOrCreateLLVMFunction(IFA->getResolver(), DeclTy, GD,
3304  /*ForVTable=*/false);
3305  llvm::GlobalIFunc *GIF =
3307  "", Resolver, &getModule());
3308  if (Entry) {
3309  if (GIF->getResolver() == Entry) {
3310  Diags.Report(IFA->getLocation(), diag::err_cyclic_alias) << 1;
3311  return;
3312  }
3313  assert(Entry->isDeclaration());
3314 
3315  // If there is a declaration in the module, then we had an extern followed
3316  // by the ifunc, as in:
3317  // extern int test();
3318  // ...
3319  // int test() __attribute__((ifunc("resolver")));
3320  //
3321  // Remove it and replace uses of it with the ifunc.
3322  GIF->takeName(Entry);
3323 
3324  Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GIF,
3325  Entry->getType()));
3326  Entry->eraseFromParent();
3327  } else
3328  GIF->setName(MangledName);
3329 
3330  SetCommonAttributes(D, GIF);
3331 }
3332 
3333 llvm::Function *CodeGenModule::getIntrinsic(unsigned IID,
3334  ArrayRef<llvm::Type*> Tys) {
3335  return llvm::Intrinsic::getDeclaration(&getModule(), (llvm::Intrinsic::ID)IID,
3336  Tys);
3337 }
3338 
3339 static llvm::StringMapEntry<llvm::GlobalVariable *> &
3340 GetConstantCFStringEntry(llvm::StringMap<llvm::GlobalVariable *> &Map,
3341  const StringLiteral *Literal, bool TargetIsLSB,
3342  bool &IsUTF16, unsigned &StringLength) {
3343  StringRef String = Literal->getString();
3344  unsigned NumBytes = String.size();
3345 
3346  // Check for simple case.
3347  if (!Literal->containsNonAsciiOrNull()) {
3348  StringLength = NumBytes;
3349  return *Map.insert(std::make_pair(String, nullptr)).first;
3350  }
3351 
3352  // Otherwise, convert the UTF8 literals into a string of shorts.
3353  IsUTF16 = true;
3354 
3355  SmallVector<llvm::UTF16, 128> ToBuf(NumBytes + 1); // +1 for ending nulls.
3356  const llvm::UTF8 *FromPtr = (const llvm::UTF8 *)String.data();
3357  llvm::UTF16 *ToPtr = &ToBuf[0];
3358 
3359  (void)llvm::ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes, &ToPtr,
3360  ToPtr + NumBytes, llvm::strictConversion);
3361 
3362  // ConvertUTF8toUTF16 returns the length in ToPtr.
3363  StringLength = ToPtr - &ToBuf[0];
3364 
3365  // Add an explicit null.
3366  *ToPtr = 0;
3367  return *Map.insert(std::make_pair(
3368  StringRef(reinterpret_cast<const char *>(ToBuf.data()),
3369  (StringLength + 1) * 2),
3370  nullptr)).first;
3371 }
3372 
3375  unsigned StringLength = 0;
3376  bool isUTF16 = false;
3377  llvm::StringMapEntry<llvm::GlobalVariable *> &Entry =
3378  GetConstantCFStringEntry(CFConstantStringMap, Literal,
3379  getDataLayout().isLittleEndian(), isUTF16,
3380  StringLength);
3381 
3382  if (auto *C = Entry.second)
3383  return ConstantAddress(C, CharUnits::fromQuantity(C->getAlignment()));
3384 
3385  llvm::Constant *Zero = llvm::Constant::getNullValue(Int32Ty);
3386  llvm::Constant *Zeros[] = { Zero, Zero };
3387 
3388  // If we don't already have it, get __CFConstantStringClassReference.
3389  if (!CFConstantStringClassRef) {
3391  Ty = llvm::ArrayType::get(Ty, 0);
3392  llvm::Constant *GV =
3393  CreateRuntimeVariable(Ty, "__CFConstantStringClassReference");
3394 
3395  if (getTriple().isOSBinFormatCOFF()) {
3396  IdentifierInfo &II = getContext().Idents.get(GV->getName());
3399  llvm::GlobalValue *CGV = cast<llvm::GlobalValue>(GV);
3400 
3401  const VarDecl *VD = nullptr;
3402  for (const auto &Result : DC->lookup(&II))
3403  if ((VD = dyn_cast<VarDecl>(Result)))
3404  break;
3405 
3406  if (!VD || !VD->hasAttr<DLLExportAttr>()) {
3407  CGV->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
3408  CGV->setLinkage(llvm::GlobalValue::ExternalLinkage);
3409  } else {
3410  CGV->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
3411  CGV->setLinkage(llvm::GlobalValue::ExternalLinkage);
3412  }
3413  }
3414 
3415  // Decay array -> ptr
3416  CFConstantStringClassRef =
3417  llvm::ConstantExpr::getGetElementPtr(Ty, GV, Zeros);
3418  }
3419 
3421 
3422  auto *STy = cast<llvm::StructType>(getTypes().ConvertType(CFTy));
3423 
3425  auto Fields = Builder.beginStruct(STy);
3426 
3427  // Class pointer.
3428  Fields.add(cast<llvm::ConstantExpr>(CFConstantStringClassRef));
3429 
3430  // Flags.
3431  Fields.addInt(IntTy, isUTF16 ? 0x07d0 : 0x07C8);
3432 
3433  // String pointer.
3434  llvm::Constant *C = nullptr;
3435  if (isUTF16) {
3436  auto Arr = llvm::makeArrayRef(
3437  reinterpret_cast<uint16_t *>(const_cast<char *>(Entry.first().data())),
3438  Entry.first().size() / 2);
3439  C = llvm::ConstantDataArray::get(VMContext, Arr);
3440  } else {
3441  C = llvm::ConstantDataArray::getString(VMContext, Entry.first());
3442  }
3443 
3444  // Note: -fwritable-strings doesn't make the backing store strings of
3445  // CFStrings writable. (See <rdar://problem/10657500>)
3446  auto *GV =
3447  new llvm::GlobalVariable(getModule(), C->getType(), /*isConstant=*/true,
3448  llvm::GlobalValue::PrivateLinkage, C, ".str");
3449  GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
3450  // Don't enforce the target's minimum global alignment, since the only use
3451  // of the string is via this class initializer.
3452  CharUnits Align = isUTF16
3455  GV->setAlignment(Align.getQuantity());
3456 
3457  // FIXME: We set the section explicitly to avoid a bug in ld64 224.1.
3458  // Without it LLVM can merge the string with a non unnamed_addr one during
3459  // LTO. Doing that changes the section it ends in, which surprises ld64.
3460  if (getTriple().isOSBinFormatMachO())
3461  GV->setSection(isUTF16 ? "__TEXT,__ustring"
3462  : "__TEXT,__cstring,cstring_literals");
3463 
3464  // String.
3465  llvm::Constant *Str =
3466  llvm::ConstantExpr::getGetElementPtr(GV->getValueType(), GV, Zeros);
3467 
3468  if (isUTF16)
3469  // Cast the UTF16 string to the correct type.
3470  Str = llvm::ConstantExpr::getBitCast(Str, Int8PtrTy);
3471  Fields.add(Str);
3472 
3473  // String length.
3474  auto Ty = getTypes().ConvertType(getContext().LongTy);
3475  Fields.addInt(cast<llvm::IntegerType>(Ty), StringLength);
3476 
3477  CharUnits Alignment = getPointerAlign();
3478 
3479  // The struct.
3480  GV = Fields.finishAndCreateGlobal("_unnamed_cfstring_", Alignment,
3481  /*isConstant=*/false,
3482  llvm::GlobalVariable::PrivateLinkage);
3483  switch (getTriple().getObjectFormat()) {
3484  case llvm::Triple::UnknownObjectFormat:
3485  llvm_unreachable("unknown file format");
3486  case llvm::Triple::COFF:
3487  case llvm::Triple::ELF:
3488  case llvm::Triple::Wasm:
3489  GV->setSection("cfstring");
3490  break;
3491  case llvm::Triple::MachO:
3492  GV->setSection("__DATA,__cfstring");
3493  break;
3494  }
3495  Entry.second = GV;
3496 
3497  return ConstantAddress(GV, Alignment);
3498 }
3499 
3501  if (ObjCFastEnumerationStateType.isNull()) {
3502  RecordDecl *D = Context.buildImplicitRecord("__objcFastEnumerationState");
3503  D->startDefinition();
3504 
3505  QualType FieldTypes[] = {
3506  Context.UnsignedLongTy,
3507  Context.getPointerType(Context.getObjCIdType()),
3508  Context.getPointerType(Context.UnsignedLongTy),
3509  Context.getConstantArrayType(Context.UnsignedLongTy,
3510  llvm::APInt(32, 5), ArrayType::Normal, 0)
3511  };
3512 
3513  for (size_t i = 0; i < 4; ++i) {
3514  FieldDecl *Field = FieldDecl::Create(Context,
3515  D,
3516  SourceLocation(),
3517  SourceLocation(), nullptr,
3518  FieldTypes[i], /*TInfo=*/nullptr,
3519  /*BitWidth=*/nullptr,
3520  /*Mutable=*/false,
3521  ICIS_NoInit);
3522  Field->setAccess(AS_public);
3523  D->addDecl(Field);
3524  }
3525 
3526  D->completeDefinition();
3527  ObjCFastEnumerationStateType = Context.getTagDeclType(D);
3528  }
3529 
3530  return ObjCFastEnumerationStateType;
3531 }
3532 
3533 llvm::Constant *
3535  assert(!E->getType()->isPointerType() && "Strings are always arrays");
3536 
3537  // Don't emit it as the address of the string, emit the string data itself
3538  // as an inline array.
3539  if (E->getCharByteWidth() == 1) {
3540  SmallString<64> Str(E->getString());
3541 
3542  // Resize the string to the right size, which is indicated by its type.
3543  const ConstantArrayType *CAT = Context.getAsConstantArrayType(E->getType());
3544  Str.resize(CAT->getSize().getZExtValue());
3545  return llvm::ConstantDataArray::getString(VMContext, Str, false);
3546  }
3547 
3548  auto *AType = cast<llvm::ArrayType>(getTypes().ConvertType(E->getType()));
3549  llvm::Type *ElemTy = AType->getElementType();
3550  unsigned NumElements = AType->getNumElements();
3551 
3552  // Wide strings have either 2-byte or 4-byte elements.
3553  if (ElemTy->getPrimitiveSizeInBits() == 16) {
3554  SmallVector<uint16_t, 32> Elements;
3555  Elements.reserve(NumElements);
3556 
3557  for(unsigned i = 0, e = E->getLength(); i != e; ++i)
3558  Elements.push_back(E->getCodeUnit(i));
3559  Elements.resize(NumElements);
3560  return llvm::ConstantDataArray::get(VMContext, Elements);
3561  }
3562 
3563  assert(ElemTy->getPrimitiveSizeInBits() == 32);
3564  SmallVector<uint32_t, 32> Elements;
3565  Elements.reserve(NumElements);
3566 
3567  for(unsigned i = 0, e = E->getLength(); i != e; ++i)
3568  Elements.push_back(E->getCodeUnit(i));
3569  Elements.resize(NumElements);
3570  return llvm::ConstantDataArray::get(VMContext, Elements);
3571 }
3572 
3573 static llvm::GlobalVariable *
3574 GenerateStringLiteral(llvm::Constant *C, llvm::GlobalValue::LinkageTypes LT,
3575  CodeGenModule &CGM, StringRef GlobalName,
3576  CharUnits Alignment) {
3577  // OpenCL v1.2 s6.5.3: a string literal is in the constant address space.
3578  unsigned AddrSpace = 0;
3579  if (CGM.getLangOpts().OpenCL)
3581 
3582  llvm::Module &M = CGM.getModule();
3583  // Create a global variable for this string
3584  auto *GV = new llvm::GlobalVariable(
3585  M, C->getType(), !CGM.getLangOpts().WritableStrings, LT, C, GlobalName,
3586  nullptr, llvm::GlobalVariable::NotThreadLocal, AddrSpace);
3587  GV->setAlignment(Alignment.getQuantity());
3588  GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
3589  if (GV->isWeakForLinker()) {
3590  assert(CGM.supportsCOMDAT() && "Only COFF uses weak string literals");
3591  GV->setComdat(M.getOrInsertComdat(GV->getName()));
3592  }
3593 
3594  return GV;
3595 }
3596 
3597 /// GetAddrOfConstantStringFromLiteral - Return a pointer to a
3598 /// constant array for the given string literal.
3601  StringRef Name) {
3603 
3604  llvm::Constant *C = GetConstantArrayFromStringLiteral(S);
3605  llvm::GlobalVariable **Entry = nullptr;
3606  if (!LangOpts.WritableStrings) {
3607  Entry = &ConstantStringMap[C];
3608  if (auto GV = *Entry) {
3609  if (Alignment.getQuantity() > GV->getAlignment())
3610  GV->setAlignment(Alignment.getQuantity());
3611  return ConstantAddress(GV, Alignment);
3612  }
3613  }
3614 
3615  SmallString<256> MangledNameBuffer;
3616  StringRef GlobalVariableName;
3617  llvm::GlobalValue::LinkageTypes LT;
3618 
3619  // Mangle the string literal if the ABI allows for it. However, we cannot
3620  // do this if we are compiling with ASan or -fwritable-strings because they
3621  // rely on strings having normal linkage.
3622  if (!LangOpts.WritableStrings &&
3623  !LangOpts.Sanitize.has(SanitizerKind::Address) &&
3625  llvm::raw_svector_ostream Out(MangledNameBuffer);
3627 
3628  LT = llvm::GlobalValue::LinkOnceODRLinkage;
3629  GlobalVariableName = MangledNameBuffer;
3630  } else {
3631  LT = llvm::GlobalValue::PrivateLinkage;
3632  GlobalVariableName = Name;
3633  }
3634 
3635  auto GV = GenerateStringLiteral(C, LT, *this, GlobalVariableName, Alignment);
3636  if (Entry)
3637  *Entry = GV;
3638 
3639  SanitizerMD->reportGlobalToASan(GV, S->getStrTokenLoc(0), "<string literal>",
3640  QualType());
3641  return ConstantAddress(GV, Alignment);
3642 }
3643 
3644 /// GetAddrOfConstantStringFromObjCEncode - Return a pointer to a constant
3645 /// array for the given ObjCEncodeExpr node.
3648  std::string Str;
3650 
3651  return GetAddrOfConstantCString(Str);
3652 }
3653 
3654 /// GetAddrOfConstantCString - Returns a pointer to a character array containing
3655 /// the literal and a terminating '\0' character.
3656 /// The result has pointer to array type.
3658  const std::string &Str, const char *GlobalName) {
3659  StringRef StrWithNull(Str.c_str(), Str.size() + 1);
3660  CharUnits Alignment =
3662 
3663  llvm::Constant *C =
3664  llvm::ConstantDataArray::getString(getLLVMContext(), StrWithNull, false);
3665 
3666  // Don't share any string literals if strings aren't constant.
3667  llvm::GlobalVariable **Entry = nullptr;
3668  if (!LangOpts.WritableStrings) {
3669  Entry = &ConstantStringMap[C];
3670  if (auto GV = *Entry) {
3671  if (Alignment.getQuantity() > GV->getAlignment())
3672  GV->setAlignment(Alignment.getQuantity());
3673  return ConstantAddress(GV, Alignment);
3674  }
3675  }
3676 
3677  // Get the default prefix if a name wasn't specified.
3678  if (!GlobalName)
3679  GlobalName = ".str";
3680  // Create a global variable for this.
3681  auto GV = GenerateStringLiteral(C, llvm::GlobalValue::PrivateLinkage, *this,
3682  GlobalName, Alignment);
3683  if (Entry)
3684  *Entry = GV;
3685  return ConstantAddress(GV, Alignment);
3686 }
3687 
3689  const MaterializeTemporaryExpr *E, const Expr *Init) {
3690  assert((E->getStorageDuration() == SD_Static ||
3691  E->getStorageDuration() == SD_Thread) && "not a global temporary");
3692  const auto *VD = cast<VarDecl>(E->getExtendingDecl());
3693 
3694  // If we're not materializing a subobject of the temporary, keep the
3695  // cv-qualifiers from the type of the MaterializeTemporaryExpr.
3696  QualType MaterializedType = Init->getType();
3697  if (Init == E->GetTemporaryExpr())
3698  MaterializedType = E->getType();
3699 
3700  CharUnits Align = getContext().getTypeAlignInChars(MaterializedType);
3701 
3702  if (llvm::Constant *Slot = MaterializedGlobalTemporaryMap[E])
3703  return ConstantAddress(Slot, Align);
3704 
3705  // FIXME: If an externally-visible declaration extends multiple temporaries,
3706  // we need to give each temporary the same name in every translation unit (and
3707  // we also need to make the temporaries externally-visible).
3709  llvm::raw_svector_ostream Out(Name);
3711  VD, E->getManglingNumber(), Out);
3712 
3713  APValue *Value = nullptr;
3714  if (E->getStorageDuration() == SD_Static) {
3715  // We might have a cached constant initializer for this temporary. Note
3716  // that this might have a different value from the value computed by
3717  // evaluating the initializer if the surrounding constant expression
3718  // modifies the temporary.
3719  Value = getContext().getMaterializedTemporaryValue(E, false);
3720  if (Value && Value->isUninit())
3721  Value = nullptr;
3722  }
3723 
3724  // Try evaluating it now, it might have a constant initializer.
3725  Expr::EvalResult EvalResult;
3726  if (!Value && Init->EvaluateAsRValue(EvalResult, getContext()) &&
3727  !EvalResult.hasSideEffects())
3728  Value = &EvalResult.Val;
3729 
3730  llvm::Constant *InitialValue = nullptr;
3731  bool Constant = false;
3732  llvm::Type *Type;
3733  if (Value) {
3734  // The temporary has a constant initializer, use it.
3735  InitialValue = EmitConstantValue(*Value, MaterializedType, nullptr);
3736  Constant = isTypeConstant(MaterializedType, /*ExcludeCtor*/Value);
3737  Type = InitialValue->getType();
3738  } else {
3739  // No initializer, the initialization will be provided when we
3740  // initialize the declaration which performed lifetime extension.
3741  Type = getTypes().ConvertTypeForMem(MaterializedType);
3742  }
3743 
3744  // Create a global variable for this lifetime-extended temporary.
3745  llvm::GlobalValue::LinkageTypes Linkage =
3746  getLLVMLinkageVarDefinition(VD, Constant);
3747  if (Linkage == llvm::GlobalVariable::ExternalLinkage) {
3748  const VarDecl *InitVD;
3749  if (VD->isStaticDataMember() && VD->getAnyInitializer(InitVD) &&
3750  isa<CXXRecordDecl>(InitVD->getLexicalDeclContext())) {
3751  // Temporaries defined inside a class get linkonce_odr linkage because the
3752  // class can be defined in multipe translation units.
3753  Linkage = llvm::GlobalVariable::LinkOnceODRLinkage;
3754  } else {
3755  // There is no need for this temporary to have external linkage if the
3756  // VarDecl has external linkage.
3758  }
3759  }
3760  unsigned AddrSpace =
3761  VD ? GetGlobalVarAddressSpace(VD) : MaterializedType.getAddressSpace();
3762  auto TargetAS = getContext().getTargetAddressSpace(AddrSpace);
3763  auto *GV = new llvm::GlobalVariable(
3764  getModule(), Type, Constant, Linkage, InitialValue, Name.c_str(),
3765  /*InsertBefore=*/nullptr, llvm::GlobalVariable::NotThreadLocal, TargetAS);
3766  setGlobalVisibility(GV, VD);
3767  GV->setAlignment(Align.getQuantity());
3768  if (supportsCOMDAT() && GV->isWeakForLinker())
3769  GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
3770  if (VD->getTLSKind())
3771  setTLSMode(GV, *VD);
3772  llvm::Constant *CV = GV;
3773  if (AddrSpace != LangAS::Default)
3775  *this, GV, AddrSpace, LangAS::Default,
3776  Type->getPointerTo(
3777  getContext().getTargetAddressSpace(LangAS::Default)));
3778  MaterializedGlobalTemporaryMap[E] = CV;
3779  return ConstantAddress(CV, Align);
3780 }
3781 
3782 /// EmitObjCPropertyImplementations - Emit information for synthesized
3783 /// properties for an implementation.
3784 void CodeGenModule::EmitObjCPropertyImplementations(const
3786  for (const auto *PID : D->property_impls()) {
3787  // Dynamic is just for type-checking.
3788  if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) {
3789  ObjCPropertyDecl *PD = PID->getPropertyDecl();
3790 
3791  // Determine which methods need to be implemented, some may have
3792  // been overridden. Note that ::isPropertyAccessor is not the method
3793  // we want, that just indicates if the decl came from a
3794  // property. What we want to know is if the method is defined in
3795  // this implementation.
3796  if (!D->getInstanceMethod(PD->getGetterName()))
3798  const_cast<ObjCImplementationDecl *>(D), PID);
3799  if (!PD->isReadOnly() &&
3800  !D->getInstanceMethod(PD->getSetterName()))
3802  const_cast<ObjCImplementationDecl *>(D), PID);
3803  }
3804  }
3805 }
3806 
3808  const ObjCInterfaceDecl *iface = impl->getClassInterface();
3809  for (const ObjCIvarDecl *ivar = iface->all_declared_ivar_begin();
3810  ivar; ivar = ivar->getNextIvar())
3811  if (ivar->getType().isDestructedType())
3812  return true;
3813 
3814  return false;
3815 }
3816 
3819  CodeGenFunction CGF(CGM);
3821  E = D->init_end(); B != E; ++B) {
3822  CXXCtorInitializer *CtorInitExp = *B;
3823  Expr *Init = CtorInitExp->getInit();
3824  if (!CGF.isTrivialInitializer(Init))
3825  return false;
3826  }
3827  return true;
3828 }
3829 
3830 /// EmitObjCIvarInitializations - Emit information for ivar initialization
3831 /// for an implementation.
3832 void CodeGenModule::EmitObjCIvarInitializations(ObjCImplementationDecl *D) {
3833  // We might need a .cxx_destruct even if we don't have any ivar initializers.
3834  if (needsDestructMethod(D)) {
3835  IdentifierInfo *II = &getContext().Idents.get(".cxx_destruct");
3836  Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
3837  ObjCMethodDecl *DTORMethod =
3839  cxxSelector, getContext().VoidTy, nullptr, D,
3840  /*isInstance=*/true, /*isVariadic=*/false,
3841  /*isPropertyAccessor=*/true, /*isImplicitlyDeclared=*/true,
3842  /*isDefined=*/false, ObjCMethodDecl::Required);
3843  D->addInstanceMethod(DTORMethod);
3844  CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, DTORMethod, false);
3845  D->setHasDestructors(true);
3846  }
3847 
3848  // If the implementation doesn't have any ivar initializers, we don't need
3849  // a .cxx_construct.
3850  if (D->getNumIvarInitializers() == 0 ||
3851  AllTrivialInitializers(*this, D))
3852  return;
3853 
3854  IdentifierInfo *II = &getContext().Idents.get(".cxx_construct");
3855  Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
3856  // The constructor returns 'self'.
3858  D->getLocation(),
3859  D->getLocation(),
3860  cxxSelector,
3862  nullptr, D, /*isInstance=*/true,
3863  /*isVariadic=*/false,
3864  /*isPropertyAccessor=*/true,
3865  /*isImplicitlyDeclared=*/true,
3866  /*isDefined=*/false,
3868  D->addInstanceMethod(CTORMethod);
3869  CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, CTORMethod, true);
3870  D->setHasNonZeroConstructors(true);
3871 }
3872 
3873 // EmitLinkageSpec - Emit all declarations in a linkage spec.
3874 void CodeGenModule::EmitLinkageSpec(const LinkageSpecDecl *LSD) {
3875  if (LSD->getLanguage() != LinkageSpecDecl::lang_c &&
3877  ErrorUnsupported(LSD, "linkage spec");
3878  return;
3879  }
3880 
3881  EmitDeclContext(LSD);
3882 }
3883 
3884 void CodeGenModule::EmitDeclContext(const DeclContext *DC) {
3885  for (auto *I : DC->decls()) {
3886  // Unlike other DeclContexts, the contents of an ObjCImplDecl at TU scope
3887  // are themselves considered "top-level", so EmitTopLevelDecl on an
3888  // ObjCImplDecl does not recursively visit them. We need to do that in
3889  // case they're nested inside another construct (LinkageSpecDecl /
3890  // ExportDecl) that does stop them from being considered "top-level".
3891  if (auto *OID = dyn_cast<ObjCImplDecl>(I)) {
3892  for (auto *M : OID->methods())
3893  EmitTopLevelDecl(M);
3894  }
3895 
3897  }
3898 }
3899 
3900 /// EmitTopLevelDecl - Emit code for a single top level declaration.
3902  // Ignore dependent declarations.
3903  if (D->getDeclContext() && D->getDeclContext()->isDependentContext())
3904  return;
3905 
3906  switch (D->getKind()) {
3907  case Decl::CXXConversion:
3908  case Decl::CXXMethod:
3909  case Decl::Function:
3910  // Skip function templates
3911  if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() ||
3912  cast<FunctionDecl>(D)->isLateTemplateParsed())
3913  return;
3914 
3915  EmitGlobal(cast<FunctionDecl>(D));
3916  // Always provide some coverage mapping
3917  // even for the functions that aren't emitted.
3919  break;
3920 
3921  case Decl::CXXDeductionGuide:
3922  // Function-like, but does not result in code emission.
3923  break;
3924 
3925  case Decl::Var:
3926  case Decl::Decomposition:
3927  // Skip variable templates
3928  if (cast<VarDecl>(D)->getDescribedVarTemplate())
3929  return;
3930  LLVM_FALLTHROUGH;
3931  case Decl::VarTemplateSpecialization:
3932  EmitGlobal(cast<VarDecl>(D));
3933  if (auto *DD = dyn_cast<DecompositionDecl>(D))
3934  for (auto *B : DD->bindings())
3935  if (auto *HD = B->getHoldingVar())
3936  EmitGlobal(HD);
3937  break;
3938 
3939  // Indirect fields from global anonymous structs and unions can be
3940  // ignored; only the actual variable requires IR gen support.
3941  case Decl::IndirectField:
3942  break;
3943 
3944  // C++ Decls
3945  case Decl::Namespace:
3946  EmitDeclContext(cast<NamespaceDecl>(D));
3947  break;
3948  case Decl::CXXRecord:
3949  if (DebugInfo) {
3950  if (auto *ES = D->getASTContext().getExternalSource())
3951  if (ES->hasExternalDefinitions(D) == ExternalASTSource::EK_Never)
3952  DebugInfo->completeUnusedClass(cast<CXXRecordDecl>(*D));
3953  }
3954  // Emit any static data members, they may be definitions.
3955  for (auto *I : cast<CXXRecordDecl>(D)->decls())
3956  if (isa<VarDecl>(I) || isa<CXXRecordDecl>(I))
3958  break;
3959  // No code generation needed.
3960  case Decl::UsingShadow:
3961  case Decl::ClassTemplate:
3962  case Decl::VarTemplate:
3963  case Decl::VarTemplatePartialSpecialization:
3964  case Decl::FunctionTemplate:
3965  case Decl::TypeAliasTemplate:
3966  case Decl::Block:
3967  case Decl::Empty:
3968  break;
3969  case Decl::Using: // using X; [C++]
3970  if (CGDebugInfo *DI = getModuleDebugInfo())
3971  DI->EmitUsingDecl(cast<UsingDecl>(*D));
3972  return;
3973  case Decl::NamespaceAlias:
3974  if (CGDebugInfo *DI = getModuleDebugInfo())
3975  DI->EmitNamespaceAlias(cast<NamespaceAliasDecl>(*D));
3976  return;
3977  case Decl::UsingDirective: // using namespace X; [C++]
3978  if (CGDebugInfo *DI = getModuleDebugInfo())
3979  DI->EmitUsingDirective(cast<UsingDirectiveDecl>(*D));
3980  return;
3981  case Decl::CXXConstructor:
3982  // Skip function templates
3983  if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() ||
3984  cast<FunctionDecl>(D)->isLateTemplateParsed())
3985  return;
3986 
3987  getCXXABI().EmitCXXConstructors(cast<CXXConstructorDecl>(D));
3988  break;
3989  case Decl::CXXDestructor:
3990  if (cast<FunctionDecl>(D)->isLateTemplateParsed())
3991  return;
3992  getCXXABI().EmitCXXDestructors(cast<CXXDestructorDecl>(D));
3993  break;
3994 
3995  case Decl::StaticAssert:
3996  // Nothing to do.
3997  break;
3998 
3999  // Objective-C Decls
4000 
4001  // Forward declarations, no (immediate) code generation.
4002  case Decl::ObjCInterface:
4003  case Decl::ObjCCategory:
4004  break;
4005 
4006  case Decl::ObjCProtocol: {
4007  auto *Proto = cast<ObjCProtocolDecl>(D);
4008  if (Proto->isThisDeclarationADefinition())
4009  ObjCRuntime->GenerateProtocol(Proto);
4010  break;
4011  }
4012 
4013  case Decl::ObjCCategoryImpl:
4014  // Categories have properties but don't support synthesize so we
4015  // can ignore them here.
4016  ObjCRuntime->GenerateCategory(cast<ObjCCategoryImplDecl>(D));
4017  break;
4018 
4019  case Decl::ObjCImplementation: {
4020  auto *OMD = cast<ObjCImplementationDecl>(D);
4021  EmitObjCPropertyImplementations(OMD);
4022  EmitObjCIvarInitializations(OMD);
4023  ObjCRuntime->GenerateClass(OMD);
4024  // Emit global variable debug information.
4025  if (CGDebugInfo *DI = getModuleDebugInfo())
4026  if (getCodeGenOpts().getDebugInfo() >= codegenoptions::LimitedDebugInfo)
4027  DI->getOrCreateInterfaceType(getContext().getObjCInterfaceType(
4028  OMD->getClassInterface()), OMD->getLocation());
4029  break;
4030  }
4031  case Decl::ObjCMethod: {
4032  auto *OMD = cast<ObjCMethodDecl>(D);
4033  // If this is not a prototype, emit the body.
4034  if (OMD->getBody())
4035  CodeGenFunction(*this).GenerateObjCMethod(OMD);
4036  break;
4037  }
4038  case Decl::ObjCCompatibleAlias:
4039  ObjCRuntime->RegisterAlias(cast<ObjCCompatibleAliasDecl>(D));
4040  break;
4041 
4042  case Decl::PragmaComment: {
4043  const auto *PCD = cast<PragmaCommentDecl>(D);
4044  switch (PCD->getCommentKind()) {
4045  case PCK_Unknown:
4046  llvm_unreachable("unexpected pragma comment kind");
4047  case PCK_Linker:
4048  AppendLinkerOptions(PCD->getArg());
4049  break;
4050  case PCK_Lib:
4051  AddDependentLib(PCD->getArg());
4052  break;
4053  case PCK_Compiler:
4054  case PCK_ExeStr:
4055  case PCK_User:
4056  break; // We ignore all of these.
4057  }
4058  break;
4059  }
4060 
4061  case Decl::PragmaDetectMismatch: {
4062  const auto *PDMD = cast<PragmaDetectMismatchDecl>(D);
4063  AddDetectMismatch(PDMD->getName(), PDMD->getValue());
4064  break;
4065  }
4066 
4067  case Decl::LinkageSpec:
4068  EmitLinkageSpec(cast<LinkageSpecDecl>(D));
4069  break;
4070 
4071  case Decl::FileScopeAsm: {
4072  // File-scope asm is ignored during device-side CUDA compilation.
4073  if (LangOpts.CUDA && LangOpts.CUDAIsDevice)
4074  break;
4075  // File-scope asm is ignored during device-side OpenMP compilation.
4076  if (LangOpts.OpenMPIsDevice)
4077  break;
4078  auto *AD = cast<FileScopeAsmDecl>(D);
4079  getModule().appendModuleInlineAsm(AD->getAsmString()->getString());
4080  break;
4081  }
4082 
4083  case Decl::Import: {
4084  auto *Import = cast<ImportDecl>(D);
4085 
4086  // If we've already imported this module, we're done.
4087  if (!ImportedModules.insert(Import->getImportedModule()))
4088  break;
4089 
4090  // Emit debug information for direct imports.
4091  if (!Import->getImportedOwningModule()) {
4092  if (CGDebugInfo *DI = getModuleDebugInfo())
4093  DI->EmitImportDecl(*Import);
4094  }
4095 
4096  // Find all of the submodules and emit the module initializers.
4097  llvm::SmallPtrSet<clang::Module *, 16> Visited;
4099  Visited.insert(Import->getImportedModule());
4100  Stack.push_back(Import->getImportedModule());
4101 
4102  while (!Stack.empty()) {
4103  clang::Module *Mod = Stack.pop_back_val();
4104  if (!EmittedModuleInitializers.insert(Mod).second)
4105  continue;
4106 
4107  for (auto *D : Context.getModuleInitializers(Mod))
4108  EmitTopLevelDecl(D);
4109 
4110  // Visit the submodules of this module.
4112  SubEnd = Mod->submodule_end();
4113  Sub != SubEnd; ++Sub) {
4114  // Skip explicit children; they need to be explicitly imported to emit
4115  // the initializers.
4116  if ((*Sub)->IsExplicit)
4117  continue;
4118 
4119  if (Visited.insert(*Sub).second)
4120  Stack.push_back(*Sub);
4121  }
4122  }
4123  break;
4124  }
4125 
4126  case Decl::Export:
4127  EmitDeclContext(cast<ExportDecl>(D));
4128  break;
4129 
4130  case Decl::OMPThreadPrivate:
4131  EmitOMPThreadPrivateDecl(cast<OMPThreadPrivateDecl>(D));
4132  break;
4133 
4134  case Decl::ClassTemplateSpecialization: {
4135  const auto *Spec = cast<ClassTemplateSpecializationDecl>(D);
4136  if (DebugInfo &&
4137  Spec->getSpecializationKind() == TSK_ExplicitInstantiationDefinition &&
4138  Spec->hasDefinition())
4139  DebugInfo->completeTemplateDefinition(*Spec);
4140  break;
4141  }
4142 
4143  case Decl::OMPDeclareReduction:
4144  EmitOMPDeclareReduction(cast<OMPDeclareReductionDecl>(D));
4145  break;
4146 
4147  default:
4148  // Make sure we handled everything we should, every other kind is a
4149  // non-top-level decl. FIXME: Would be nice to have an isTopLevelDeclKind
4150  // function. Need to recode Decl::Kind to do that easily.
4151  assert(isa<TypeDecl>(D) && "Unsupported decl kind");
4152  break;
4153  }
4154 }
4155 
4157  // Do we need to generate coverage mapping?
4158  if (!CodeGenOpts.CoverageMapping)
4159  return;
4160  switch (D->getKind()) {
4161  case Decl::CXXConversion:
4162  case Decl::CXXMethod:
4163  case Decl::Function:
4164  case Decl::ObjCMethod:
4165  case Decl::CXXConstructor:
4166  case Decl::CXXDestructor: {
4167  if (!cast<FunctionDecl>(D)->doesThisDeclarationHaveABody())
4168  return;
4169  auto I = DeferredEmptyCoverageMappingDecls.find(D);
4170  if (I == DeferredEmptyCoverageMappingDecls.end())
4171  DeferredEmptyCoverageMappingDecls[D] = true;
4172  break;
4173  }
4174  default:
4175  break;
4176  };
4177 }
4178 
4180  // Do we need to generate coverage mapping?
4181  if (!CodeGenOpts.CoverageMapping)
4182  return;
4183  if (const auto *Fn = dyn_cast<FunctionDecl>(D)) {
4184  if (Fn->isTemplateInstantiation())
4185  ClearUnusedCoverageMapping(Fn->getTemplateInstantiationPattern());
4186  }
4187  auto I = DeferredEmptyCoverageMappingDecls.find(D);
4188  if (I == DeferredEmptyCoverageMappingDecls.end())
4189  DeferredEmptyCoverageMappingDecls[D] = false;
4190  else
4191  I->second = false;
4192 }
4193 
4195  std::vector<const Decl *> DeferredDecls;
4196  for (const auto &I : DeferredEmptyCoverageMappingDecls) {
4197  if (!I.second)
4198  continue;
4199  DeferredDecls.push_back(I.first);
4200  }
4201  // Sort the declarations by their location to make sure that the tests get a
4202  // predictable order for the coverage mapping for the unused declarations.
4203  if (CodeGenOpts.DumpCoverageMapping)
4204  std::sort(DeferredDecls.begin(), DeferredDecls.end(),
4205  [] (const Decl *LHS, const Decl *RHS) {
4206  return LHS->getLocStart() < RHS->getLocStart();
4207  });
4208  for (const auto *D : DeferredDecls) {
4209  switch (D->getKind()) {
4210  case Decl::CXXConversion:
4211  case Decl::CXXMethod:
4212  case Decl::Function:
4213  case Decl::ObjCMethod: {
4214  CodeGenPGO PGO(*this);
4215  GlobalDecl GD(cast<FunctionDecl>(D));
4217  getFunctionLinkage(GD));
4218  break;
4219  }
4220  case Decl::CXXConstructor: {
4221  CodeGenPGO PGO(*this);
4222  GlobalDecl GD(cast<CXXConstructorDecl>(D), Ctor_Base);
4224  getFunctionLinkage(GD));
4225  break;
4226  }
4227  case Decl::CXXDestructor: {
4228  CodeGenPGO PGO(*this);
4229  GlobalDecl GD(cast<CXXDestructorDecl>(D), Dtor_Base);
4231  getFunctionLinkage(GD));
4232  break;
4233  }
4234  default:
4235  break;
4236  };
4237  }
4238 }
4239 
4240 /// Turns the given pointer into a constant.
4241 static llvm::Constant *GetPointerConstant(llvm::LLVMContext &Context,
4242  const void *Ptr) {
4243  uintptr_t PtrInt = reinterpret_cast<uintptr_t>(Ptr);
4244  llvm::Type *i64 = llvm::Type::getInt64Ty(Context);
4245  return llvm::ConstantInt::get(i64, PtrInt);
4246 }
4247 
4249  llvm::NamedMDNode *&GlobalMetadata,
4250  GlobalDecl D,
4251  llvm::GlobalValue *Addr) {
4252  if (!GlobalMetadata)
4253  GlobalMetadata =
4254  CGM.getModule().getOrInsertNamedMetadata("clang.global.decl.ptrs");
4255 
4256  // TODO: should we report variant information for ctors/dtors?
4257  llvm::Metadata *Ops[] = {llvm::ConstantAsMetadata::get(Addr),
4258  llvm::ConstantAsMetadata::get(GetPointerConstant(
4259  CGM.getLLVMContext(), D.getDecl()))};
4260  GlobalMetadata->addOperand(llvm::MDNode::get(CGM.getLLVMContext(), Ops));
4261 }
4262 
4263 /// For each function which is declared within an extern "C" region and marked
4264 /// as 'used', but has internal linkage, create an alias from the unmangled
4265 /// name to the mangled name if possible. People expect to be able to refer
4266 /// to such functions with an unmangled name from inline assembly within the
4267 /// same translation unit.
4268 void CodeGenModule::EmitStaticExternCAliases() {
4269  // Don't do anything if we're generating CUDA device code -- the NVPTX
4270  // assembly target doesn't support aliases.
4271  if (Context.getTargetInfo().getTriple().isNVPTX())
4272  return;
4273  for (auto &I : StaticExternCValues) {
4274  IdentifierInfo *Name = I.first;
4275  llvm::GlobalValue *Val = I.second;
4276  if (Val && !getModule().getNamedValue(Name->getName()))
4278  }
4279 }
4280 
4281 bool CodeGenModule::lookupRepresentativeDecl(StringRef MangledName,
4282  GlobalDecl &Result) const {
4283  auto Res = Manglings.find(MangledName);
4284  if (Res == Manglings.end())
4285  return false;
4286  Result = Res->getValue();
4287  return true;
4288 }
4289 
4290 /// Emits metadata nodes associating all the global values in the
4291 /// current module with the Decls they came from. This is useful for
4292 /// projects using IR gen as a subroutine.
4293 ///
4294 /// Since there's currently no way to associate an MDNode directly
4295 /// with an llvm::GlobalValue, we create a global named metadata
4296 /// with the name 'clang.global.decl.ptrs'.
4297 void CodeGenModule::EmitDeclMetadata() {
4298  llvm::NamedMDNode *GlobalMetadata = nullptr;
4299 
4300  for (auto &I : MangledDeclNames) {
4301  llvm::GlobalValue *Addr = getModule().getNamedValue(I.second);
4302  // Some mangled names don't necessarily have an associated GlobalValue
4303  // in this module, e.g. if we mangled it for DebugInfo.
4304  if (Addr)
4305  EmitGlobalDeclMetadata(*this, GlobalMetadata, I.first, Addr);
4306  }
4307 }
4308 
4309 /// Emits metadata nodes for all the local variables in the current
4310 /// function.
4311 void CodeGenFunction::EmitDeclMetadata() {
4312  if (LocalDeclMap.empty()) return;
4313 
4314  llvm::LLVMContext &Context = getLLVMContext();
4315 
4316  // Find the unique metadata ID for this name.
4317  unsigned DeclPtrKind = Context.getMDKindID("clang.decl.ptr");
4318 
4319  llvm::NamedMDNode *GlobalMetadata = nullptr;
4320 
4321  for (auto &I : LocalDeclMap) {
4322  const Decl *D = I.first;
4323  llvm::Value *Addr = I.second.getPointer();
4324  if (auto *Alloca = dyn_cast<llvm::AllocaInst>(Addr)) {
4326  Alloca->setMetadata(
4327  DeclPtrKind, llvm::MDNode::get(
4328  Context, llvm::ValueAsMetadata::getConstant(DAddr)));
4329  } else if (auto *GV = dyn_cast<llvm::GlobalValue>(Addr)) {
4330  GlobalDecl GD = GlobalDecl(cast<VarDecl>(D));
4331  EmitGlobalDeclMetadata(CGM, GlobalMetadata, GD, GV);
4332  }
4333  }
4334 }
4335 
4336 void CodeGenModule::EmitVersionIdentMetadata() {
4337  llvm::NamedMDNode *IdentMetadata =
4338  TheModule.getOrInsertNamedMetadata("llvm.ident");
4339  std::string Version = getClangFullVersion();
4340  llvm::LLVMContext &Ctx = TheModule.getContext();
4341 
4342  llvm::Metadata *IdentNode[] = {llvm::MDString::get(Ctx, Version)};
4343  IdentMetadata->addOperand(llvm::MDNode::get(Ctx, IdentNode));
4344 }
4345 
4346 void CodeGenModule::EmitTargetMetadata() {
4347  // Warning, new MangledDeclNames may be appended within this loop.
4348  // We rely on MapVector insertions adding new elements to the end
4349  // of the container.
4350  // FIXME: Move this loop into the one target that needs it, and only
4351  // loop over those declarations for which we couldn't emit the target
4352  // metadata when we emitted the declaration.
4353  for (unsigned I = 0; I != MangledDeclNames.size(); ++I) {
4354  auto Val = *(MangledDeclNames.begin() + I);
4355  const Decl *D = Val.first.getDecl()->getMostRecentDecl();
4356  llvm::GlobalValue *GV = GetGlobalValue(Val.second);
4357  getTargetCodeGenInfo().emitTargetMD(D, GV, *this);
4358  }
4359 }
4360 
4361 void CodeGenModule::EmitCoverageFile() {
4362  if (getCodeGenOpts().CoverageDataFile.empty() &&
4364  return;
4365 
4366  llvm::NamedMDNode *CUNode = TheModule.getNamedMetadata("llvm.dbg.cu");
4367  if (!CUNode)
4368  return;
4369 
4370  llvm::NamedMDNode *GCov = TheModule.getOrInsertNamedMetadata("llvm.gcov");
4371  llvm::LLVMContext &Ctx = TheModule.getContext();
4372  auto *CoverageDataFile =
4373  llvm::MDString::get(Ctx, getCodeGenOpts().CoverageDataFile);
4374  auto *CoverageNotesFile =
4375  llvm::MDString::get(Ctx, getCodeGenOpts().CoverageNotesFile);
4376  for (int i = 0, e = CUNode->getNumOperands(); i != e; ++i) {
4377  llvm::MDNode *CU = CUNode->getOperand(i);
4378  llvm::Metadata *Elts[] = {CoverageNotesFile, CoverageDataFile, CU};
4379  GCov->addOperand(llvm::MDNode::get(Ctx, Elts));
4380  }
4381 }
4382 
4383 llvm::Constant *CodeGenModule::EmitUuidofInitializer(StringRef Uuid) {
4384  // Sema has checked that all uuid strings are of the form
4385  // "12345678-1234-1234-1234-1234567890ab".
4386  assert(Uuid.size() == 36);
4387  for (unsigned i = 0; i < 36; ++i) {
4388  if (i == 8 || i == 13 || i == 18 || i == 23) assert(Uuid[i] == '-');
4389  else assert(isHexDigit(Uuid[i]));
4390  }
4391 
4392  // The starts of all bytes of Field3 in Uuid. Field 3 is "1234-1234567890ab".
4393  const unsigned Field3ValueOffsets[8] = { 19, 21, 24, 26, 28, 30, 32, 34 };
4394 
4395  llvm::Constant *Field3[8];
4396  for (unsigned Idx = 0; Idx < 8; ++Idx)
4397  Field3[Idx] = llvm::ConstantInt::get(
4398  Int8Ty, Uuid.substr(Field3ValueOffsets[Idx], 2), 16);
4399 
4400  llvm::Constant *Fields[4] = {
4401  llvm::ConstantInt::get(Int32Ty, Uuid.substr(0, 8), 16),
4402  llvm::ConstantInt::get(Int16Ty, Uuid.substr(9, 4), 16),
4403  llvm::ConstantInt::get(Int16Ty, Uuid.substr(14, 4), 16),
4404  llvm::ConstantArray::get(llvm::ArrayType::get(Int8Ty, 8), Field3)
4405  };
4406 
4407  return llvm::ConstantStruct::getAnon(Fields);
4408 }
4409 
4411  bool ForEH) {
4412  // Return a bogus pointer if RTTI is disabled, unless it's for EH.
4413  // FIXME: should we even be calling this method if RTTI is disabled
4414  // and it's not for EH?
4415  if (!ForEH && !getLangOpts().RTTI)
4416  return llvm::Constant::getNullValue(Int8PtrTy);
4417 
4418  if (ForEH && Ty->isObjCObjectPointerType() &&
4419  LangOpts.ObjCRuntime.isGNUFamily())
4420  return ObjCRuntime->GetEHType(Ty);
4421 
4422  return getCXXABI().getAddrOfRTTIDescriptor(Ty);
4423 }
4424 
4426  for (auto RefExpr : D->varlists()) {
4427  auto *VD = cast<VarDecl>(cast<DeclRefExpr>(RefExpr)->getDecl());
4428  bool PerformInit =
4429  VD->getAnyInitializer() &&
4430  !VD->getAnyInitializer()->isConstantInitializer(getContext(),
4431  /*ForRef=*/false);
4432 
4434  if (auto InitFunction = getOpenMPRuntime().emitThreadPrivateVarDefinition(
4435  VD, Addr, RefExpr->getLocStart(), PerformInit))
4436  CXXGlobalInits.push_back(InitFunction);
4437  }
4438 }
4439 
4441  llvm::Metadata *&InternalId = MetadataIdMap[T.getCanonicalType()];
4442  if (InternalId)
4443  return InternalId;
4444 
4445  if (isExternallyVisible(T->getLinkage())) {
4446  std::string OutName;
4447  llvm::raw_string_ostream Out(OutName);
4449 
4450  InternalId = llvm::MDString::get(getLLVMContext(), Out.str());
4451  } else {
4452  InternalId = llvm::MDNode::getDistinct(getLLVMContext(),
4454  }
4455 
4456  return InternalId;
4457 }
4458 
4459 /// Returns whether this module needs the "all-vtables" type identifier.
4461  // Returns true if at least one of vtable-based CFI checkers is enabled and
4462  // is not in the trapping mode.
4463  return ((LangOpts.Sanitize.has(SanitizerKind::CFIVCall) &&
4464  !CodeGenOpts.SanitizeTrap.has(SanitizerKind::CFIVCall)) ||
4465  (LangOpts.Sanitize.has(SanitizerKind::CFINVCall) &&
4466  !CodeGenOpts.SanitizeTrap.has(SanitizerKind::CFINVCall)) ||
4467  (LangOpts.Sanitize.has(SanitizerKind::CFIDerivedCast) &&
4468  !CodeGenOpts.SanitizeTrap.has(SanitizerKind::CFIDerivedCast)) ||
4469  (LangOpts.Sanitize.has(SanitizerKind::CFIUnrelatedCast) &&
4470  !CodeGenOpts.SanitizeTrap.has(SanitizerKind::CFIUnrelatedCast)));
4471 }
4472 
4473 void CodeGenModule::AddVTableTypeMetadata(llvm::GlobalVariable *VTable,
4474  CharUnits Offset,
4475  const CXXRecordDecl *RD) {
4476  llvm::Metadata *MD =
4478  VTable->addTypeMetadata(Offset.getQuantity(), MD);
4479 
4480  if (CodeGenOpts.SanitizeCfiCrossDso)
4481  if (auto CrossDsoTypeId = CreateCrossDsoCfiTypeId(MD))
4482  VTable->addTypeMetadata(Offset.getQuantity(),
4483  llvm::ConstantAsMetadata::get(CrossDsoTypeId));
4484 
4485  if (NeedAllVtablesTypeId()) {
4486  llvm::Metadata *MD = llvm::MDString::get(getLLVMContext(), "all-vtables");
4487  VTable->addTypeMetadata(Offset.getQuantity(), MD);
4488  }
4489 }
4490 
4491 // Fills in the supplied string map with the set of target features for the
4492 // passed in function.
4493 void CodeGenModule::getFunctionFeatureMap(llvm::StringMap<bool> &FeatureMap,
4494  const FunctionDecl *FD) {
4495  StringRef TargetCPU = Target.getTargetOpts().CPU;
4496  if (const auto *TD = FD->getAttr<TargetAttr>()) {
4497  // If we have a TargetAttr build up the feature map based on that.
4498  TargetAttr::ParsedTargetAttr ParsedAttr = TD->parse();
4499 
4500  // Make a copy of the features as passed on the command line into the
4501  // beginning of the additional features from the function to override.
4502  ParsedAttr.Features.insert(ParsedAttr.Features.begin(),
4503  Target.getTargetOpts().FeaturesAsWritten.begin(),
4504  Target.getTargetOpts().FeaturesAsWritten.end());
4505 
4506  if (ParsedAttr.Architecture != "")
4507  TargetCPU = ParsedAttr.Architecture ;
4508 
4509  // Now populate the feature map, first with the TargetCPU which is either
4510  // the default or a new one from the target attribute string. Then we'll use
4511  // the passed in features (FeaturesAsWritten) along with the new ones from
4512  // the attribute.
4513  Target.initFeatureMap(FeatureMap, getDiags(), TargetCPU,
4514  ParsedAttr.Features);
4515  } else {
4516  Target.initFeatureMap(FeatureMap, getDiags(), TargetCPU,
4517  Target.getTargetOpts().Features);
4518  }
4519 }
4520 
4521 llvm::SanitizerStatReport &CodeGenModule::getSanStats() {
4522  if (!SanStats)
4523  SanStats = llvm::make_unique<llvm::SanitizerStatReport>(&getModule());
4524 
4525  return *SanStats;
4526 }
4527 llvm::Value *
4529  CodeGenFunction &CGF) {
4530  llvm::Constant *C = EmitConstantExpr(E, E->getType(), &CGF);
4531  auto SamplerT = getOpenCLRuntime().getSamplerType();
4532  auto FTy = llvm::FunctionType::get(SamplerT, {C->getType()}, false);
4533  return CGF.Builder.CreateCall(CreateRuntimeFunction(FTy,
4534  "__translate_sampler_initializer"),
4535  {C});
4536 }
void setLinkage(Linkage L)
Definition: Visibility.h:86
std::string CoverageNotesFile
The filename with path we use for coverage notes files.
std::string ProfileInstrumentUsePath
Name of the profile file to use as input for -fprofile-instr-use.
unsigned getAddressSpace() const
Return the address space of this type.
Definition: Type.h:5605
CGOpenCLRuntime & getOpenCLRuntime()
Return a reference to the configured OpenCL runtime.
Defines the clang::ASTContext interface.
The generic AArch64 ABI is also a modified version of the Itanium ABI, but it has fewer divergences t...
Definition: TargetCXXABI.h:84
FunctionDecl - An instance of this class is created to represent a function declaration or definition...
Definition: Decl.h:1618
llvm::IntegerType * IntTy
int
External linkage, which indicates that the entity can be referred to from other translation units...
Definition: Linkage.h:61
StringRef getName() const
getName - Get the name of identifier for this declaration as a StringRef.
Definition: Decl.h:237
void EmitDeferredUnusedCoverageMappings()
Emit all the deferred coverage mappings for the uninstrumented functions.
Smart pointer class that efficiently represents Objective-C method names.
void DecorateInstructionWithInvariantGroup(llvm::Instruction *I, const CXXRecordDecl *RD)
Adds !invariant.barrier !tag to instruction.
Holds information about both target-independent and target-specific builtins, allowing easy queries b...
Definition: Builtins.h:65
Complete object ctor.
Definition: ABI.h:26
GVALinkage GetGVALinkageForFunction(const FunctionDecl *FD) const
TemplateSpecializationKind getTemplateSpecializationKind() const
If this variable is an instantiation of a variable template or a static data member of a class templa...
Definition: Decl.cpp:2363
A (possibly-)qualified type.
Definition: Type.h:616
The iOS 64-bit ABI is follows ARM's published 64-bit ABI more closely, but we don't guarantee to foll...
Definition: TargetCXXABI.h:71
Static storage duration.
Definition: Specifiers.h:276
const ABIInfo & getABIInfo() const
getABIInfo() - Returns ABI info helper for the target.
Definition: TargetInfo.h:53
GlobalDecl getWithDecl(const Decl *D)
Definition: GlobalDecl.h:86
bool isValid() const
CharUnits getDeclAlign(const Decl *D, bool ForAlignof=false) const
Return a conservative estimate of the alignment of the specified decl D.
bool hasTrivialDestructor() const
Determine whether this class has a trivial destructor (C++ [class.dtor]p3)
Definition: DeclCXX.h:1350
void UpdateCompletedType(const TagDecl *TD)
UpdateCompletedType - When we find the full definition for a TagDecl, replace the 'opaque' type we pr...
CXXCtorType getCtorType() const
Definition: GlobalDecl.h:64
llvm::Module & getModule() const
RecordDecl * buildImplicitRecord(StringRef Name, RecordDecl::TagKind TK=TTK_Struct) const
Create a new implicit TU-level CXXRecordDecl or RecordDecl declaration.
llvm::LLVMContext & getLLVMContext()
llvm::CallingConv::ID getBuiltinCC() const
Return the calling convention to use for compiler builtins.
Definition: ABIInfo.h:81
std::string getClangFullVersion()
Retrieves a string representing the complete clang version, which includes the clang version number...
Definition: Version.cpp:118
ConstantAddress GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *)
Return a pointer to a constant array for the given ObjCEncodeExpr node.
submodule_iterator submodule_begin()
Definition: Module.h:514
The standard implementation of ConstantInitBuilder used in Clang.
Stmt - This represents one statement.
Definition: Stmt.h:60
decl_range decls() const
decls_begin/decls_end - Iterate over the declarations stored in this context.
Definition: DeclBase.h:1537
FunctionType - C99 6.7.5.3 - Function Declarators.
Definition: Type.h:2923
SanitizerSet Sanitize
Set of enabled sanitizers.
Definition: LangOptions.h:100
virtual void mangleCXXDtor(const CXXDestructorDecl *D, CXXDtorType Type, raw_ostream &)=0
unsigned GetGlobalVarAddressSpace(const VarDecl *D)
Return the AST address space of the underlying global variable for D, as determined by its declaratio...
Expr * GetTemporaryExpr() const
Retrieve the temporary-generating subexpression whose value will be materialized into a glvalue...
Definition: ExprCXX.h:3987
Defines the SourceManager interface.
QuantityType getQuantity() const
getQuantity - Get the raw integer representation of this quantity.
Definition: CharUnits.h:179
bool isRecordType() const
Definition: Type.h:5769
virtual void mangleCXXCtor(const CXXConstructorDecl *D, CXXCtorType Type, raw_ostream &)=0
Defines the clang::Module class, which describes a module in the source code.
Decl - This represents one declaration (or definition), e.g.
Definition: DeclBase.h:81
llvm::MDNode * getTBAAStructInfo(QualType QTy)
VarDecl * getDefinition(ASTContext &)
Get the real (not just tentative) definition for this declaration.
Definition: Decl.cpp:2069
void setAliasAttributes(const Decl *D, llvm::GlobalValue *GV)
Set attributes which must be preserved by an alias.
Defines the C++ template declaration subclasses.
llvm::CallingConv::ID getRuntimeCC() const
bool isAlignmentRequired(const Type *T) const
Determine if the alignment the type has was required using an alignment attribute.
llvm::Type * FloatTy
float, double
std::string getAsString() const
Definition: Type.h:942
const llvm::DataLayout & getDataLayout() const
FullSourceLoc getFullLoc(SourceLocation Loc) const
Definition: ASTContext.h:671
The base class of the type hierarchy.
Definition: Type.h:1303
bool isDependentContext() const
Determines whether this context is dependent on a template parameter.
Definition: DeclBase.cpp:1009
void setFunctionLinkage(GlobalDecl GD, llvm::Function *F)
Stores additional source code information like skipped ranges which is required by the coverage mappi...
void GenerateObjCSetter(ObjCImplementationDecl *IMP, const ObjCPropertyImplDecl *PID)
GenerateObjCSetter - Synthesize an Objective-C property setter function for the given property...
Definition: CGObjC.cpp:1341
std::unique_ptr< llvm::MemoryBuffer > Buffer
DiagnosticBuilder Report(SourceLocation Loc, unsigned DiagID)
Issue the message to the client.
Definition: Diagnostic.h:1205
void GenerateCode(GlobalDecl GD, llvm::Function *Fn, const CGFunctionInfo &FnInfo)
const Expr * getInit() const
Definition: Decl.h:1146
NamespaceDecl - Represent a C++ namespace.
Definition: Decl.h:461
Represents a call to a C++ constructor.
Definition: ExprCXX.h:1177
static void setLinkageAndVisibilityForGV(llvm::GlobalValue *GV, const NamedDecl *ND)
virtual void completeDefinition()
completeDefinition - Notes that the definition of this type is now complete.
Definition: Decl.cpp:3921
bool isWeakImported() const
Determine whether this is a weak-imported symbol.
Definition: DeclBase.cpp:653
void EmitCfiCheckFail()
Emit a cross-DSO CFI failure handling function.
Definition: CGExpr.cpp:2896
static const llvm::GlobalObject * getAliasedGlobal(const llvm::GlobalIndirectSymbol &GIS)
PreprocessorOptions - This class is used for passing the various options used in preprocessor initial...
llvm::IntegerType * Int8Ty
i8, i16, i32, and i64
Represents a prvalue temporary that is written into memory so that a reference can bind to it...
Definition: ExprCXX.h:3946
static llvm::GlobalValue::VisibilityTypes GetLLVMVisibility(Visibility V)
llvm::Constant * EmitConstantValue(const APValue &Value, QualType DestType, CodeGenFunction *CGF=nullptr)
Emit the given constant value as a constant, in the type's scalar representation. ...
'gcc' is the Objective-C runtime shipped with GCC, implementing a fragile Objective-C ABI ...
Definition: ObjCRuntime.h:50
void HandleCXXStaticMemberVarInstantiation(VarDecl *VD)
Tell the consumer that this variable has been instantiated.
VarDecl - An instance of this class is created to represent a variable declaration or definition...
Definition: Decl.h:758
Expr * getInit() const
Get the initializer.
Definition: DeclCXX.h:2299
TLSKind getTLSKind() const
Definition: Decl.cpp:1876
void setFunctionDefinitionAttributes(const FunctionDecl *D, llvm::Function *F)
Set attributes for a global definition.
CGDebugInfo * getModuleDebugInfo()
void setFunctionDLLStorageClass(GlobalDecl GD, llvm::Function *F)
Set the DLL storage class on F.
This class gathers all debug information during compilation and is responsible for emitting to llvm g...
Definition: CGDebugInfo.h:53
CharUnits GetTargetTypeStoreSize(llvm::Type *Ty) const
Return the store size, in character units, of the given LLVM type.
static llvm::GlobalVariable * GenerateStringLiteral(llvm::Constant *C, llvm::GlobalValue::LinkageTypes LT, CodeGenModule &CGM, StringRef GlobalName, CharUnits Alignment)
ObjCMethodDecl - Represents an instance or class method declaration.
Definition: DeclObjC.h:113
bool hasGlobalStorage() const
Returns true for all variables that do not have local storage.
Definition: Decl.h:1005
virtual void getDependentLibraryOption(llvm::StringRef Lib, llvm::SmallString< 24 > &Opt) const
Gets the linker options necessary to link a dependent library on this platform.
Definition: TargetInfo.cpp:395
llvm::Type * ConvertTypeForMem(QualType T)
ConvertTypeForMem - Convert type T into a llvm::Type.
bool NeedAllVtablesTypeId() const
Returns whether this module needs the "all-vtables" type identifier.
Linkage
Describes the different kinds of linkage (C++ [basic.link], C99 6.2.2) that an entity may have...
Definition: Linkage.h:25
GlobalDecl getCanonicalDecl() const
Definition: GlobalDecl.h:54
RecordDecl - Represents a struct/union/class.
Definition: Decl.h:3354
Visibility getVisibility() const
Definition: Visibility.h:83
unsigned getMaxAlignment() const
getMaxAlignment - return the maximum alignment specified by attributes on this decl, 0 if there are none.
Definition: DeclBase.cpp:354
static const FunctionDecl * GetRuntimeFunctionDecl(ASTContext &C, StringRef Name)
One of these records is kept for each identifier that is lexed.
'macosx-fragile' is the Apple-provided NeXT-derived runtime on Mac OS X platforms that use the fragil...
Definition: ObjCRuntime.h:37
bool hasAttr() const
Definition: DeclBase.h:521
CodeGenFunction - This class organizes the per-function state that is used while generating LLVM code...
llvm::Type * ConvertType(QualType T)
ConvertType - Convert type T into a llvm::Type.
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:128
bool isReferenceType() const
Definition: Type.h:5721
llvm::Constant * getAddrOfCXXStructor(const CXXMethodDecl *MD, StructorType Type, const CGFunctionInfo *FnInfo=nullptr, llvm::FunctionType *FnType=nullptr, bool DontDefer=false, ForDefinition_t IsForDefinition=NotForDefinition)
Return the address of the constructor/destructor of the given type.
Definition: CGCXX.cpp:240
The generic Mips ABI is a modified version of the Itanium ABI.
Definition: TargetCXXABI.h:90
FieldDecl - An instance of this class is created by Sema::ActOnField to represent a member of a struc...
Definition: Decl.h:2366
static CGCXXABI * createCXXABI(CodeGenModule &CGM)
InlineVariableDefinitionKind getInlineVariableDefinitionKind(const VarDecl *VD) const
Determine whether a definition of this inline variable should be treated as a weak or strong definiti...
StructorType getFromDtorType(CXXDtorType T)
Definition: CodeGenTypes.h:104
virtual void emitTargetMD(const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const
emitTargetMD - Provides a convenient hook to handle extra target-specific metadata for the given glob...
Definition: TargetInfo.h:62
void startDefinition()
Starts the definition of this tag declaration.
Definition: Decl.cpp:3675
StringRef getBufferName(SourceLocation Loc, bool *Invalid=nullptr) const
Return the filename or buffer identifier of the buffer the location is in.
int Category
Definition: Format.cpp:1304
This declaration is definitely a definition.
Definition: Decl.h:1078
void GenerateObjCCtorDtorMethod(ObjCImplementationDecl *IMP, ObjCMethodDecl *MD, bool ctor)
Definition: CGObjC.cpp:1422
virtual bool initFeatureMap(llvm::StringMap< bool > &Features, DiagnosticsEngine &Diags, StringRef CPU, const std::vector< std::string > &FeatureVec) const
Initialize the map with the default set of target features for the CPU this should include all legal ...
Definition: TargetInfo.cpp:338
bool imbueXRayAttrs(llvm::Function *Fn, SourceLocation Loc, StringRef Category=StringRef()) const
Imbue XRay attributes to a function, applying the always/never attribute lists in the process...
Keeps track of the various options that can be enabled, which controls the dialect of C or C++ that i...
Definition: LangOptions.h:48
const Decl * getDecl() const
Definition: GlobalDecl.h:62
Linkage getLinkage() const
Definition: Visibility.h:82
Describes a module or submodule.
Definition: Module.h:57
IdentifierTable & Idents
Definition: ASTContext.h:513
bool shouldMangleDeclName(const NamedDecl *D)
Definition: Mangle.cpp:99
bool hasExternalStorage() const
Returns true if a variable has extern or private_extern storage.
Definition: Decl.h:996
Objects with "default" visibility are seen by the dynamic linker and act like normal objects...
Definition: Visibility.h:44
llvm::Constant * GetConstantArrayFromStringLiteral(const StringLiteral *E)
Return a constant array for the given string.
T * getAttr() const
Definition: DeclBase.h:518
static void EmitGlobalDeclMetadata(CodeGenModule &CGM, llvm::NamedMDNode *&GlobalMetadata, GlobalDecl D, llvm::GlobalValue *Addr)
bool isBlacklistedLocation(SourceLocation Loc, StringRef Category=StringRef()) const
uint32_t getCodeUnit(size_t i) const
Definition: Expr.h:1576
CGCUDARuntime & getCUDARuntime()
Return a reference to the configured CUDA runtime.
const TargetInfo & getTargetInfo() const
Definition: ASTContext.h:643
Base object ctor.
Definition: ABI.h:27
const LangOptions & getLangOpts() const
Definition: ASTContext.h:659
unsigned getLength() const
Definition: Expr.h:1587
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:38
APValue Val
Val - This is the value the expression can be folded to.
Definition: Expr.h:570
uint32_t Offset
Definition: CacheTokens.cpp:43
const ValueDecl * getExtendingDecl() const
Get the declaration which triggered the lifetime-extension of this temporary, if any.
Definition: ExprCXX.h:4009
The Microsoft ABI is the ABI used by Microsoft Visual Studio (and compatible compilers).
Definition: TargetCXXABI.h:113
void EmitOMPDeclareReduction(const OMPDeclareReductionDecl *D, CodeGenFunction *CGF=nullptr)
Emit a code for declare reduction construct.
Definition: CGDecl.cpp:1933
virtual void mangleReferenceTemporary(const VarDecl *D, unsigned ManglingNumber, raw_ostream &)=0
unsigned char PointerWidthInBits
The width of a pointer into the generic address space.
field_range fields() const
Definition: Decl.h:3483
Concrete class used by the front-end to report problems and issues.
Definition: Diagnostic.h:147
CGObjCRuntime * CreateMacObjCRuntime(CodeGenModule &CGM)
void ConstructAttributeList(StringRef Name, const CGFunctionInfo &Info, CGCalleeInfo CalleeInfo, llvm::AttributeList &Attrs, unsigned &CallingConv, bool AttrOnCallSite)
Get the LLVM attributes and calling convention to use for a particular function type.
Definition: CGCall.cpp:1772
Kind getKind() const
Definition: TargetCXXABI.h:132
Module * Parent
The parent of this module.
Definition: Module.h:79
Selector getSetterName() const
Definition: DeclObjC.h:868
const SanitizerBlacklist & getSanitizerBlacklist() const
Definition: ASTContext.h:661
Defines the Diagnostic-related interfaces.
submodule_iterator submodule_end()
Definition: Module.h:516
virtual uint64_t getMaxPointerWidth() const
Return the maximum width of pointers on this target.
Definition: TargetInfo.h:315
void addCompilerUsedGlobal(llvm::GlobalValue *GV)
Add a global to a list to be added to the llvm.compiler.used metadata.
bool isIncompleteType(NamedDecl **Def=nullptr) const
Types are partitioned into 3 broad categories (C99 6.2.5p1): object types, function types...
Definition: Type.cpp:1930
Represents binding an expression to a temporary.
Definition: ExprCXX.h:1134
llvm::Constant * CreateRuntimeVariable(llvm::Type *Ty, StringRef Name)
Create a new runtime global variable with the specified type and name.
DeclContext * getLexicalDeclContext()
getLexicalDeclContext - The declaration context where this Decl was lexically declared (LexicalDC)...
Definition: DeclBase.h:796
CXXTemporary * getTemporary()
Definition: ExprCXX.h:1154
const CGFunctionInfo & arrangeCXXMethodDeclaration(const CXXMethodDecl *MD)
C++ methods have some special rules and also have implicit parameters.
Definition: CGCall.cpp:263
bool isStaticLocal() const
isStaticLocal - Returns true if a variable with function scope is a static local variable.
Definition: Decl.h:987
CharUnits getTypeSizeInChars(QualType T) const
Return the size of the specified (complete) type T, in characters.
void EmitTentativeDefinition(const VarDecl *D)
unsigned getLine() const
Return the presumed line number of this location.
void addInstanceMethod(ObjCMethodDecl *method)
Definition: DeclObjC.h:2345
llvm::SanitizerStatReport & getSanStats()
A class that does preordor or postorder depth-first traversal on the entire Clang AST and visits each...
Represents an ObjC class declaration.
Definition: DeclObjC.h:1108
propimpl_range property_impls() const
Definition: DeclObjC.h:2367
Represents a linkage specification.
Definition: DeclCXX.h:2666
void setGlobalVisibility(llvm::GlobalValue *GV, const NamedDecl *D) const
Set the visibility for the given LLVM GlobalValue.
detail::InMemoryDirectory::const_iterator I
The iOS ABI is a partial implementation of the ARM ABI.
Definition: TargetCXXABI.h:63
unsigned getWCharWidth() const
getWCharWidth/Align - Return the size of 'wchar_t' for this target, in bits.
Definition: TargetInfo.h:388
QualType getType() const
Definition: Decl.h:589
const CGFunctionInfo & arrangeGlobalDeclaration(GlobalDecl GD)
Definition: CGCall.cpp:493
std::vector< Module * >::iterator submodule_iterator
Definition: Module.h:511
void mangleName(const NamedDecl *D, raw_ostream &)
Definition: Mangle.cpp:118
llvm::Constant * CreateRuntimeFunction(llvm::FunctionType *Ty, StringRef Name, llvm::AttributeList ExtraAttrs=llvm::AttributeList(), bool Local=false)
Create a new runtime function with the specified type and name.
bool isTypeConstant(QualType QTy, bool ExcludeCtorDtor)
isTypeConstant - Determine whether an object of this type can be emitted as a constant.
bool hasUnwindExceptions() const
Does this runtime use zero-cost exceptions?
Definition: ObjCRuntime.h:285
FunctionDecl * getOperatorDelete() const
Definition: ExprCXX.h:2037
'watchos' is a variant of iOS for Apple's watchOS.
Definition: ObjCRuntime.h:46
llvm::StringMap< SectionInfo > SectionInfos
Definition: ASTContext.h:2720
static bool hasUnwindExceptions(const LangOptions &LangOpts)
Determines whether the language options require us to model unwind exceptions.
const FileEntry * getFileEntryForID(FileID FID) const
Returns the FileEntry record for the provided FileID.
static bool AllTrivialInitializers(CodeGenModule &CGM, ObjCImplementationDecl *D)
The generic ARM ABI is a modified version of the Itanium ABI proposed by ARM for use on ARM-based pla...
Definition: TargetCXXABI.h:52
std::string CurrentModule
The name of the current module, of which the main source file is a part.
Definition: LangOptions.h:130
void setHasDestructors(bool val)
Definition: DeclObjC.h:2548
CXXMethodDecl * getMethodDecl() const
Retrieves the declaration of the called method.
Definition: ExprCXX.cpp:487
const TargetCodeGenInfo & getTargetCodeGenInfo()
void AddDetectMismatch(StringRef Name, StringRef Value)
Appends a detect mismatch command to the linker options.
const TargetInfo & getTarget() const
Represents a ValueDecl that came out of a declarator.
Definition: Decl.h:636
bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const
EvaluateAsRValue - Return true if this is a constant which we can fold to an rvalue using any crazy t...
bool hasConstructorVariants() const
Does this ABI have different entrypoints for complete-object and base-subobject constructors?
Definition: TargetCXXABI.h:222
llvm::SmallSetVector< Module *, 2 > Imports
The set of modules imported by this module, and on which this module depends.
Definition: Module.h:259
void getObjCEncodingForType(QualType T, std::string &S, const FieldDecl *Field=nullptr, QualType *NotEncodedT=nullptr) const
Emit the Objective-CC type encoding for the given type T into S.
StringRef getBlockMangledName(GlobalDecl GD, const BlockDecl *BD)
ASTContext * Context
std::vector< bool > & Stack
void getFunctionFeatureMap(llvm::StringMap< bool > &FeatureMap, const FunctionDecl *FD)
void DecorateInstructionWithTBAA(llvm::Instruction *Inst, llvm::MDNode *TBAAInfo, bool ConvertTypeToTag=true)
Decorate the instruction with a TBAA tag.
void SetLLVMFunctionAttributes(const Decl *D, const CGFunctionInfo &Info, llvm::Function *F)
Set the LLVM function attributes (sext, zext, etc).
llvm::Constant * EmitAnnotationUnit(SourceLocation Loc)
Emit the annotation's translation unit.
bool isMSStaticDataMemberInlineDefinition(const VarDecl *VD) const
Returns true if this is an inline-initialized static data member which is treated as a definition for...
virtual void EmitCXXConstructors(const CXXConstructorDecl *D)=0
Emit constructor variants required by this ABI.
bool isMicrosoft() const
Is this ABI an MSVC-compatible ABI?
Definition: TargetCXXABI.h:154
const Type * getTypeForDecl() const
Definition: Decl.h:2663
BlockDecl - This represents a block literal declaration, which is like an unnamed FunctionDecl...
Definition: Decl.h:3557
ValueDecl - Represent the declaration of a variable (in which case it is an lvalue) a function (in wh...
Definition: Decl.h:580
Expr - This represents one expression.
Definition: Expr.h:105
StringRef getName() const
Return the actual identifier string.
CXXDtorType getDtorType() const
Definition: GlobalDecl.h:69
static ObjCMethodDecl * Create(ASTContext &C, SourceLocation beginLoc, SourceLocation endLoc, Selector SelInfo, QualType T, TypeSourceInfo *ReturnTInfo, DeclContext *contextDecl, bool isInstance=true, bool isVariadic=false, bool isPropertyAccessor=false, bool isImplicitlyDeclared=false, bool isDefined=false, ImplementationControl impControl=None, bool HasRelatedResultType=false)
Definition: DeclObjC.cpp:759
Emit only debug info necessary for generating line number tables (-gline-tables-only).
'macosx' is the Apple-provided NeXT-derived runtime on Mac OS X platforms that use the non-fragile AB...
Definition: ObjCRuntime.h:32
virtual void EmitCXXDestructors(const CXXDestructorDecl *D)=0
Emit destructor variants required by this ABI.
CGCXXABI & getCXXABI() const
void AddGlobalAnnotations(const ValueDecl *D, llvm::GlobalValue *GV)
Add global annotations that are set on D, for the global GV.
void GenerateObjCMethod(const ObjCMethodDecl *OMD)
Generate an Objective-C method.
Definition: CGObjC.cpp:572
StorageDuration getStorageDuration() const
Retrieve the storage duration for the materialized temporary.
Definition: ExprCXX.h:3990
llvm::Constant * GetAddrOfGlobalVar(const VarDecl *D, llvm::Type *Ty=nullptr, ForDefinition_t IsForDefinition=NotForDefinition)
Return the llvm::Constant for the address of the given global variable.
void SetInternalFunctionAttributes(const Decl *D, llvm::Function *F, const CGFunctionInfo &FI)
Set the attributes on the LLVM function for the given decl and function info.
Organizes the cross-function state that is used while generating code coverage mapping data...
Represents a C++ destructor within a class.
Definition: DeclCXX.h:2551
void reportDiagnostics(DiagnosticsEngine &Diags, StringRef MainFile)
Report potential problems we've found to Diags.
TranslationUnitDecl * getTranslationUnitDecl() const
Definition: ASTContext.h:956
Defines version macros and version-related utility functions for Clang.
Decl * getMostRecentDecl()
Retrieve the most recent declaration that declares the same entity as this declaration (which may be ...
Definition: DeclBase.h:937
Kind getKind() const
Definition: DeclBase.h:410
DeclContext * getDeclContext()
Definition: DeclBase.h:416
ASTContext & getContext() const
unsigned getExpansionLineNumber(SourceLocation Loc, bool *Invalid=nullptr) const
static CharUnits fromQuantity(QuantityType Quantity)
fromQuantity - Construct a CharUnits quantity from a raw integer type.
Definition: CharUnits.h:63
static llvm::StringMapEntry< llvm::GlobalVariable * > & GetConstantCFStringEntry(llvm::StringMap< llvm::GlobalVariable * > &Map, const StringLiteral *Literal, bool TargetIsLSB, bool &IsUTF16, unsigned &StringLength)
llvm::SmallVector< LinkLibrary, 2 > LinkLibraries
The set of libraries or frameworks to link against when an entity from this module is used...
Definition: Module.h:313
llvm::LLVMContext & getLLVMContext()
CharUnits toCharUnitsFromBits(int64_t BitSize) const
Convert a size in bits to a size in characters.
Base object dtor.
Definition: ABI.h:37
llvm::GlobalValue::LinkageTypes getLLVMLinkageVarDefinition(const VarDecl *VD, bool IsConstant)
Returns LLVM linkage for a declarator.
clang::ObjCRuntime ObjCRuntime
Definition: LangOptions.h:116
llvm::Constant * EmitAnnotationString(StringRef Str)
Emit an annotation string.
llvm::PointerType * AllocaInt8PtrTy
QualType getObjCIdType() const
Represents the Objective-CC id type.
Definition: ASTContext.h:1724
bool isExternallyVisible(Linkage L)
Definition: Linkage.h:87
ConstantAddress GetAddrOfUuidDescriptor(const CXXUuidofExpr *E)
Get the address of a uuid descriptor .
llvm::GlobalVariable::LinkageTypes getFunctionLinkage(GlobalDecl GD)
Represents an unpacked "presumed" location which can be presented to the user.
unsigned Map[FirstTargetAddressSpace]
The type of a lookup table which maps from language-specific address spaces to target-specific ones...
Definition: AddressSpaces.h:53
StringRef getUuidStr() const
Definition: ExprCXX.h:856
static bool isVarDeclStrongDefinition(const ASTContext &Context, CodeGenModule &CGM, const VarDecl *D, bool NoCommon)
llvm::Function * getIntrinsic(unsigned IID, ArrayRef< llvm::Type * > Tys=None)
ValueDecl * getDecl()
Definition: Expr.h:1038
CGOpenMPRuntime(CodeGenModule &CGM)
This template specialization was implicitly instantiated from a template.
Definition: Specifiers.h:148
'gnustep' is the modern non-fragile GNUstep runtime.
Definition: ObjCRuntime.h:53
unsigned getIntAlign() const
Definition: TargetInfo.h:345
void AddVTableTypeMetadata(llvm::GlobalVariable *VTable, CharUnits Offset, const CXXRecordDecl *RD)
Create and attach type metadata for the given vtable.
bool lookupRepresentativeDecl(StringRef MangledName, GlobalDecl &Result) const
const SourceManager & SM
Definition: Format.cpp:1293
__UINTPTR_TYPE__ uintptr_t
An unsigned integer type with the property that any valid pointer to void can be converted to this ty...
Definition: opencl-c.h:82
CallingConv
CallingConv - Specifies the calling convention that a function uses.
Definition: Specifiers.h:232
VarDecl * getCanonicalDecl() override
Retrieves the "canonical" declaration of the given declaration.
Definition: Decl.cpp:1966
QualType getWideCharType() const
Return the type of wide characters.
Definition: ASTContext.h:1463
GlobalDecl - represents a global declaration.
Definition: GlobalDecl.h:29
llvm::GlobalVariable * CreateOrReplaceCXXRuntimeVariable(StringRef Name, llvm::Type *Ty, llvm::GlobalValue::LinkageTypes Linkage)
Will return a global variable of the given type.
const Expr * getAnyInitializer() const
getAnyInitializer - Get the initializer for this variable, no matter which declaration it is attached...
Definition: Decl.h:1136
llvm::Constant * EmitAnnotateAttr(llvm::GlobalValue *GV, const AnnotateAttr *AA, SourceLocation L)
Generate the llvm::ConstantStruct which contains the annotation information for a given GlobalValue...
init_iterator init_begin()
init_begin() - Retrieve an iterator to the first initializer.
Definition: DeclObjC.h:2512
ConstantAddress GetAddrOfGlobalTemporary(const MaterializeTemporaryExpr *E, const Expr *Inner)
Returns a pointer to a global variable representing a temporary with static or thread storage duratio...
WatchOS is a modernisation of the iOS ABI, which roughly means it's the iOS64 ABI ported to 32-bits...
Definition: TargetCXXABI.h:76
std::string CPU
If given, the name of the target CPU to generate code for.
Definition: TargetOptions.h:36
The l-value was considered opaque, so the alignment was determined from a type.
Thread storage duration.
Definition: Specifiers.h:275
SourceLocation getLocStart() const LLVM_READONLY
Definition: DeclBase.h:400
bool doesThisDeclarationHaveABody() const
doesThisDeclarationHaveABody - Returns whether this specific declaration of the function has a body -...
Definition: Decl.h:1882
llvm::CallingConv::ID getBuiltinCC() const
static void emitUsed(CodeGenModule &CGM, StringRef Name, std::vector< llvm::WeakTrackingVH > &List)
#define false
Definition: stdbool.h:33
CharUnits getTypeAlignInChars(QualType T) const
Return the ABI-specified alignment of a (complete) type T, in characters.
SelectorTable & Selectors
Definition: ASTContext.h:514
bool hasOneOf(SanitizerMask K) const
Check if one or more sanitizers are enabled.
Definition: Sanitizers.h:56
Kind
void RefreshTypeCacheForClass(const CXXRecordDecl *Class)
bool isUninit() const
Definition: APValue.h:182
uint64_t getPointerAlign(unsigned AddrSpace) const
Definition: TargetInfo.h:310
decl_type * getPreviousDecl()
Return the previous declaration of this declaration or NULL if this is the first declaration.
Definition: Redeclarable.h:197
void MaybeHandleStaticInExternC(const SomeDecl *D, llvm::GlobalValue *GV)
If the declaration has internal linkage but is inside an extern "C" linkage specification, prepare to emit an alias for it to the expected name.
const char * getFilename() const
Return the presumed filename of this location.
llvm::Constant * EmitConstantExpr(const Expr *E, QualType DestType, CodeGenFunction *CGF=nullptr)
Try to emit the given expression as a constant; returns 0 if the expression cannot be emitted as a co...
Encodes a location in the source.
virtual bool shouldMangleStringLiteral(const StringLiteral *SL)=0
static DeclContext * castToDeclContext(const TranslationUnitDecl *D)
Definition: Decl.h:99
IdentifierInfo & get(StringRef Name)
Return the identifier token info for the specified named identifier.
ExternalASTSource * getExternalSource() const
Retrieve a pointer to the external AST source associated with this AST context, if any...
Definition: ASTContext.h:1014
const Type * getTypePtr() const
Retrieves a pointer to the underlying (unqualified) type.
Definition: Type.h:5489
bool isConstant(const ASTContext &Ctx) const
Definition: Type.h:753
'objfw' is the Objective-C runtime included in ObjFW
Definition: ObjCRuntime.h:56
ConstantAddress GetAddrOfConstantCFString(const StringLiteral *Literal)
Return a pointer to a constant CFString object for the given string.
bool hasSideEffects() const
Definition: Expr.h:562
bool isValid() const
Return true if this is a valid SourceLocation object.
Represents a new-expression for memory allocation and constructor calls, e.g: "new CXXNewExpr(foo)"...
Definition: ExprCXX.h:1780
const std::string ID
TagDecl - Represents the declaration of a struct/union/class/enum.
Definition: Decl.h:2816
Represents a call to a member function that may be written either with member call syntax (e...
Definition: ExprCXX.h:136
ASTContext & getASTContext() const LLVM_READONLY
Definition: DeclBase.cpp:346
static OMPLinearClause * Create(const ASTContext &C, SourceLocation StartLoc, SourceLocation LParenLoc, OpenMPLinearClauseKind Modifier, SourceLocation ModifierLoc, SourceLocation ColonLoc, SourceLocation EndLoc, ArrayRef< Expr * > VL, ArrayRef< Expr * > PL, ArrayRef< Expr * > IL, Expr *Step, Expr *CalcStep, Stmt *PreInit, Expr *PostUpdate)
Creates clause with a list of variables VL and a linear step Step.
llvm::Metadata * CreateMetadataIdentifierForType(QualType T)
Create a metadata identifier for the given type.
const XRayFunctionFilter & getXRayFilter() const
Definition: ASTContext.h:665
void mangleDtorBlock(const CXXDestructorDecl *CD, CXXDtorType DT, const BlockDecl *BD, raw_ostream &Out)
Definition: Mangle.cpp:215
Per-function PGO state.
Definition: CodeGenPGO.h:29
Represents a static or instance method of a struct/union/class.
Definition: DeclCXX.h:1903
MangleContext - Context for tracking state which persists across multiple calls to the C++ name mangl...
Definition: Mangle.h:42
ConstantAddress GetAddrOfConstantStringFromLiteral(const StringLiteral *S, StringRef Name=".str")
Return a pointer to a constant array for the given string literal.
Weak for now, might become strong later in this TU.
llvm::Constant * CreateBuiltinFunction(llvm::FunctionType *Ty, StringRef Name, llvm::AttributeList ExtraAttrs=llvm::AttributeList())
Create a new compiler builtin function with the specified type and name.
const ConstantArrayType * getAsConstantArrayType(QualType T) const
Definition: ASTContext.h:2235
SourceLocation getStrTokenLoc(unsigned TokNum) const
Definition: Expr.h:1616
llvm::Constant * GetAddrOfRTTIDescriptor(QualType Ty, bool ForEH=false)
Get the address of the RTTI descriptor for the given type.
std::vector< std::string > Features
The list of target specific features to enable or disable – this should be a list of strings starting...
Definition: TargetOptions.h:55
const ObjCInterfaceDecl * getClassInterface() const
Definition: DeclObjC.h:2341
bool isTrivialInitializer(const Expr *Init)
Determine whether the given initializer is trivial in the sense that it requires no code to be genera...
Definition: CGDecl.cpp:1187
llvm::MDNode * getTBAAStructTagInfo(QualType BaseTy, llvm::MDNode *AccessN, uint64_t O)
Return the path-aware tag for given base type, access node and offset.
CanQualType VoidTy
Definition: ASTContext.h:963
unsigned getCharByteWidth() const
Definition: Expr.h:1588
SanitizerSet SanitizeTrap
Set of sanitizer checks that trap rather than diagnose.
const CodeGenOptions & getCodeGenOpts() const
void addGlobalValReplacement(llvm::GlobalValue *GV, llvm::Constant *C)
const Type * getBaseElementTypeUnsafe() const
Get the base element type of this type, potentially discarding type qualifiers.
Definition: Type.h:6000
ConstantAddress GetWeakRefReference(const ValueDecl *VD)
Get a reference to the target of VD.
An aligned address.
Definition: Address.h:25
LinkageInfo getLinkageAndVisibility() const
Determines the linkage and visibility of this entity.
Definition: Decl.cpp:1082
init_iterator init_end()
init_end() - Retrieve an iterator past the last initializer.
Definition: DeclObjC.h:2520
const LangOptions & getLangOpts() const
Represents one property declaration in an Objective-C interface.
Definition: DeclObjC.h:704
void SetLLVMFunctionAttributesForDefinition(const Decl *D, llvm::Function *F)
Set the LLVM function attributes which only apply to a function definition.
bool containsNonAsciiOrNull() const
Definition: Expr.h:1604
std::vector< std::string > FeaturesAsWritten
The list of target specific features to enable or disable, as written on the command line...
Definition: TargetOptions.h:51
The generic Itanium ABI is the standard ABI of most open-source and Unix-like platforms.
Definition: TargetCXXABI.h:34
bool isGNUFamily() const
Is this runtime basically of the GNU family of runtimes?
Definition: ObjCRuntime.h:117
lookup_result lookup(DeclarationName Name) const
lookup - Find the declarations (if any) with the given Name in this context.
Definition: DeclBase.cpp:1507
unsigned getCustomDiagID(Level L, const char(&FormatString)[N])
Return an ID for a diagnostic with the specified format string and level.
Definition: Diagnostic.h:689
void EmitTopLevelDecl(Decl *D)
Emit code for a single top level declaration.
MangleContext & getMangleContext()
Gets the mangle context.
Definition: CGCXXABI.h:96
This template specialization was instantiated from a template due to an explicit instantiation defini...
Definition: Specifiers.h:160
FileID getMainFileID() const
Returns the FileID of the main source file.
CGCXXABI * CreateMicrosoftCXXABI(CodeGenModule &CGM)
Creates a Microsoft-family ABI.
void CreateFunctionTypeMetadata(const FunctionDecl *FD, llvm::Function *F)
Create and attach type metadata to the given function.
llvm::Constant * EmitAnnotationLineNo(SourceLocation L)
Emit the annotation line number.
unsigned getBuiltinID() const
Returns a value indicating whether this function corresponds to a builtin function.
Definition: Decl.cpp:2823
void Error(SourceLocation loc, StringRef error)
Emit a general error that something can't be done.
virtual void mangleTypeName(QualType T, raw_ostream &)=0
Generates a unique string for an externally visible type for use with TBAA or type uniquing...
CXXCtorType
C++ constructor types.
Definition: ABI.h:25
The WebAssembly ABI is a modified version of the Itanium ABI.
Definition: TargetCXXABI.h:105
void addReplacement(StringRef Name, llvm::Constant *C)
ConstantAddress GetAddrOfConstantCString(const std::string &Str, const char *GlobalName=nullptr)
Returns a pointer to a character array containing the literal and a terminating '\0' character...
llvm::Constant * GetAddrOfGlobal(GlobalDecl GD, ForDefinition_t IsForDefinition=NotForDefinition)
ArrayRef< Decl * > getModuleInitializers(Module *M)
Get the initializations to perform when importing a module, if any.
Definition: ASTContext.cpp:964
void addUsedGlobal(llvm::GlobalValue *GV)
Add a global to a list to be added to the llvm.used metadata.
ObjCIvarDecl * getNextIvar()
Definition: DeclObjC.h:1899
QualType getType() const
Definition: Expr.h:127
if(T->getSizeExpr()) TRY_TO(TraverseStmt(T-> getSizeExpr()))
TLS with a dynamic initializer.
Definition: Decl.h:777
void ErrorUnsupported(const Stmt *S, const char *Type)
Print out an error that codegen doesn't support the specified stmt yet.
CGFunctionInfo - Class to encapsulate the information about a function definition.
This class organizes the cross-function state that is used while generating LLVM code.
CGOpenMPRuntime & getOpenMPRuntime()
Return a reference to the configured OpenMP runtime.
virtual void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const
setTargetAttributes - Provides a convenient hook to handle extra target-specific attributes for the g...
Definition: TargetInfo.h:57
llvm::GlobalValue * GetGlobalValue(StringRef Ref)
void mangleGlobalBlock(const BlockDecl *BD, const NamedDecl *ID, raw_ostream &Out)
Definition: Mangle.cpp:189
void mangleBlock(const DeclContext *DC, const BlockDecl *BD, raw_ostream &Out)
Definition: Mangle.cpp:224
virtual unsigned getASTAllocaAddressSpace() const
Get the AST address space for alloca.
Definition: TargetInfo.h:240
DeclContext - This is used only as base class of specific decl types that can act as declaration cont...
Definition: DeclBase.h:1215
EvalResult is a struct with detailed info about an evaluated expression.
Definition: Expr.h:568
Represents a delete expression for memory deallocation and destructor calls, e.g. ...
Definition: ExprCXX.h:1992
void GenerateObjCGetter(ObjCImplementationDecl *IMP, const ObjCPropertyImplDecl *PID)
GenerateObjCGetter - Synthesize an Objective-C property getter function.
Definition: CGObjC.cpp:810
StringRef Name
Definition: USRFinder.cpp:123
FunctionDecl * getDirectCallee()
If the callee is a FunctionDecl, return it. Otherwise return 0.
Definition: Expr.cpp:1216
ObjCMethodDecl * getInstanceMethod(Selector Sel, bool AllowHidden=false) const
Definition: DeclObjC.h:1025
The basic abstraction for the target Objective-C runtime.
Definition: ObjCRuntime.h:25
void setTLSMode(llvm::GlobalValue *GV, const VarDecl &D) const
Set the TLS mode for the given LLVM GlobalValue for the thread-local variable declaration D...
void EmitOMPThreadPrivateDecl(const OMPThreadPrivateDecl *D)
Emit a code for threadprivate directive.
std::unique_ptr< DiagnosticConsumer > create(StringRef OutputFile, DiagnosticOptions *Diags, bool MergeChildRecords=false)
Returns a DiagnosticConsumer that serializes diagnostics to a bitcode file.
LanguageIDs getLanguage() const
Return the language specified by this linkage specification.
Definition: DeclCXX.h:2707
bool hasProfileClangUse() const
Check if Clang profile use is on.
QualType getPointerType(QualType T) const
Return the uniqued reference to the type for a pointer to the specified type.
Selector getGetterName() const
Definition: DeclObjC.h:861
DefinitionKind isThisDeclarationADefinition(ASTContext &) const
Check whether this declaration is a definition.
Definition: Decl.cpp:1969
StringRef getString() const
Definition: Expr.h:1554
llvm::Constant * EmitNullConstant(QualType T)
Return the result of value-initializing the given type, i.e.
const llvm::Triple & getTriple() const
Returns the target triple of the primary target.
Definition: TargetInfo.h:792
void UpdateCompletedType(const TagDecl *TD)
detail::InMemoryDirectory::const_iterator E
static bool needsDestructMethod(ObjCImplementationDecl *impl)
TemplateSpecializationKind
Describes the kind of template specialization that a particular template specialization declaration r...
Definition: Specifiers.h:142
bool isSamplerT() const
Definition: Type.h:5833
static void addLinkOptionsPostorder(CodeGenModule &CGM, Module *Mod, SmallVectorImpl< llvm::MDNode * > &Metadata, llvm::SmallPtrSet< Module *, 16 > &Visited)
Add link options implied by the given module, including modules it depends on, using a postorder walk...
CanQualType getCanonicalType(QualType T) const
Return the canonical (structural) type corresponding to the specified potentially non-canonical type ...
Definition: ASTContext.h:2087
static llvm::GlobalVariable::ThreadLocalMode GetLLVMTLSModel(StringRef S)
virtual llvm::Function * emitThreadPrivateVarDefinition(const VarDecl *VD, Address VDAddr, SourceLocation Loc, bool PerformInit, CodeGenFunction *CGF=nullptr)
Emit a code for initialization of threadprivate variable.
void maybeSetTrivialComdat(const Decl &D, llvm::GlobalObject &GO)
bool isInSanitizerBlacklist(llvm::Function *Fn, SourceLocation Loc) const
void EmitThunks(GlobalDecl GD)
EmitThunks - Emit the associated thunks for the given global decl.
Definition: CGVTables.cpp:509
virtual void registerDeviceVar(llvm::GlobalVariable &Var, unsigned Flags)=0
void AddDeferredUnusedCoverageMapping(Decl *D)
Stored a deferred empty coverage mapping for an unused and thus uninstrumented top level declaration...
bool isVisibilityExplicit() const
Definition: Visibility.h:84
GVALinkage GetGVALinkageForVariable(const VarDecl *VD)
'ios' is the Apple-provided NeXT-derived runtime on iOS or the iOS simulator; it is always non-fragil...
Definition: ObjCRuntime.h:42
void emitEmptyCounterMapping(const Decl *D, StringRef FuncName, llvm::GlobalValue::LinkageTypes Linkage)
Emit a coverage mapping range with a counter zero for an unused declaration.
Definition: CodeGenPGO.cpp:701
ObjCImplementationDecl - Represents a class definition - this is where method definitions are specifi...
Definition: DeclObjC.h:2448
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:3784
StructorType getFromCtorType(CXXCtorType T)
Definition: CodeGenTypes.h:77
FunctionDecl * getOperatorNew() const
Definition: ExprCXX.h:1867
const T * getAs() const
Member-template getAs<specific type>'.
Definition: Type.h:6042
void AppendLinkerOptions(StringRef Opts)
Appends Opts to the "llvm.linker.options" metadata value.
llvm::PointerType * getSamplerType()
void setHasNonZeroConstructors(bool val)
Definition: DeclObjC.h:2543
llvm::Type * ConvertFunctionType(QualType FT, const FunctionDecl *FD=nullptr)
Converts the GlobalDecl into an llvm::Type.
QualType getCanonicalType() const
Definition: Type.h:5528
TargetOptions & getTargetOpts() const
Retrieve the target options.
Definition: TargetInfo.h:121
Represents a C++ base or member initializer.
Definition: DeclCXX.h:2105
virtual llvm::Constant * getAddrOfRTTIDescriptor(QualType Ty)=0
CanQualType UnsignedLongTy
Definition: ASTContext.h:972
Implements C++ ABI-specific code generation functions.
Definition: CGCXXABI.h:44
ObjCEncodeExpr, used for @encode in Objective-C.
Definition: ExprObjC.h:355
Selector getSelector(unsigned NumArgs, IdentifierInfo **IIV)
Can create any sort of selector.
bool hasDiagnostics()
Whether or not the stats we've gathered indicate any potential problems.
bool has(SanitizerMask K) const
Check if a certain (single) sanitizer is enabled.
Definition: Sanitizers.h:50
void GenerateClassData(const CXXRecordDecl *RD)
GenerateClassData - Generate all the class data required to be generated upon definition of a KeyFunc...
Definition: CGVTables.cpp:827
CodeGenOptions - Track various options which control how the code is optimized and passed to the back...
LanguageLinkage getLanguageLinkage() const
Compute the language linkage.
Definition: Decl.cpp:1950
static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old, llvm::Function *NewFn)
ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we implement a function with...
CXXConstructorDecl * getConstructor() const
Get the constructor that this expression will (ultimately) call.
Definition: ExprCXX.h:1240
llvm::Constant * GetAddrOfFunction(GlobalDecl GD, llvm::Type *Ty=nullptr, bool ForVTable=false, bool DontDefer=false, ForDefinition_t IsForDefinition=NotForDefinition)
Return the address of the given function.
CXXRecordDecl * getAsCXXRecordDecl() const
Retrieves the CXXRecordDecl that this type refers to, either because the type is a RecordType or beca...
Definition: Type.cpp:1548
StringRef getMangledName(GlobalDecl GD)
virtual void getDetectMismatchOption(llvm::StringRef Name, llvm::StringRef Value, llvm::SmallString< 32 > &Opt) const
Gets the linker options necessary to detect object file mismatches on this platform.
Definition: TargetInfo.h:217
uint64_t getCharWidth() const
Return the size of the character type, in bits.
Definition: ASTContext.h:1928
Internal linkage, which indicates that the entity can be referred to from within the translation unit...
Definition: Linkage.h:33
llvm::Value * createOpenCLIntToSamplerConversion(const Expr *E, CodeGenFunction &CGF)
void addDecl(Decl *D)
Add the declaration D into this context.
Definition: DeclBase.cpp:1396
CGCUDARuntime * CreateNVCUDARuntime(CodeGenModule &CGM)
Creates an instance of a CUDA runtime class.
Definition: CGCUDANV.cpp:377
unsigned getIntWidth() const
getIntWidth/Align - Return the size of 'signed int' and 'unsigned int' for this target, in bits.
Definition: TargetInfo.h:344
QualType getTagDeclType(const TagDecl *Decl) const
Return the unique reference to the type for the specified TagDecl (struct/union/class/enum) decl...
APValue - This class implements a discriminated union of [uninitialized] [APSInt] [APFloat]...
Definition: APValue.h:38
CodeGenTBAA - This class organizes the cross-module state that is used while lowering AST types to LL...
Definition: CodeGenTBAA.h:45
Represents a base class of a C++ class.
Definition: DeclCXX.h:158
const Expr * Replacement
Definition: AttributeList.h:59
llvm::Constant * EmitConstantInit(const VarDecl &D, CodeGenFunction *CGF=nullptr)
Try to emit the initializer for the given declaration as a constant; returns 0 if the expression cann...
static const char AnnotationSection[]
Linkage getLinkage() const
Determine the linkage of this type.
Definition: Type.cpp:3421
SourceManager & getSourceManager()
Definition: ASTContext.h:616
bool isTLSSupported() const
Whether the target supports thread-local storage.
Definition: TargetInfo.h:926
llvm::ConstantInt * getSize(CharUnits numChars)
Emit the given number of characters as a value of type size_t.
uint64_t getPointerWidth(unsigned AddrSpace) const
Return the width of pointers on this target, for the specified address space.
Definition: TargetInfo.h:307
Kind getKind() const
Definition: ObjCRuntime.h:75
virtual llvm::Value * performAddrSpaceCast(CodeGen::CodeGenFunction &CGF, llvm::Value *V, unsigned SrcAddr, unsigned DestAddr, llvm::Type *DestTy, bool IsNonNull=false) const
Perform address space cast of an expression of pointer type.
Definition: TargetInfo.cpp:432
Defines the C++ Decl subclasses, other than those for templates (found in DeclTemplate.h) and friends (in DeclFriend.h).
DiagnosticsEngine & getDiags() const
QualType getUnqualifiedType() const
Retrieve the unqualified variant of the given type, removing as little sugar as possible.
Definition: Type.h:5569
Represents a C++ struct/union/class.
Definition: DeclCXX.h:267
CGCXXABI * CreateItaniumCXXABI(CodeGenModule &CGM)
Creates an Itanium-family ABI.
BoundNodesTreeBuilder *const Builder
TargetCXXABI getCXXABI() const
Get the C++ ABI currently in use.
Definition: TargetInfo.h:861
bool isReadOnly() const
isReadOnly - Return true iff the property has a setter.
Definition: DeclObjC.h:820
bool isObjCObjectPointerType() const
Definition: Type.h:5784
QualType getEncodedType() const
Definition: ExprObjC.h:376
llvm::iterator_range< specific_attr_iterator< T > > specific_attrs() const
Definition: DeclBase.h:505
A specialization of Address that requires the address to be an LLVM Constant.
Definition: Address.h:75
ObjCIvarDecl - Represents an ObjC instance variable.
Definition: DeclObjC.h:1866
static bool HasNonDllImportDtor(QualType T)
void Release()
Finalize LLVM code generation.
static bool shouldBeInCOMDAT(CodeGenModule &CGM, const Decl &D)
void ClearUnusedCoverageMapping(const Decl *D)
Remove the deferred empty coverage mapping as this declaration is actually instrumented.
Builtin::Context & BuiltinInfo
Definition: ASTContext.h:515
virtual void mangleStringLiteral(const StringLiteral *SL, raw_ostream &)=0
void EmitGlobalAnnotations()
Emit all the global annotations.
llvm::ConstantInt * CreateCrossDsoCfiTypeId(llvm::Metadata *MD)
Generate a cross-DSO type identifier for MD.
llvm::CallingConv::ID getRuntimeCC() const
Return the calling convention to use for system runtime functions.
Definition: ABIInfo.h:76
void SetCommonAttributes(const Decl *D, llvm::GlobalValue *GV)
Set attributes which are common to any form of a global definition (alias, Objective-C method...
SourceRange getSourceRange() const LLVM_READONLY
SourceLocation tokens are not useful in isolation - they are low level value objects created/interpre...
Definition: Stmt.cpp:245
StringLiteral - This represents a string literal expression, e.g.
Definition: Expr.h:1506
Defines the clang::TargetInfo interface.
CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]).
Definition: Expr.h:2206
void RefreshTypeCacheForClass(const CXXRecordDecl *RD)
Remove stale types from the type cache when an inheritance model gets assigned to a class...
virtual bool useThunkForDtorVariant(const CXXDestructorDecl *Dtor, CXXDtorType DT) const =0
Returns true if the given destructor type should be emitted as a linkonce delegating thunk...
llvm::MDNode * getTBAAInfo(QualType QTy)
HeaderSearchOptions - Helper class for storing options related to the initialization of the HeaderSea...
QualType getObjCFastEnumerationStateType()
Retrieve the record type that describes the state of an Objective-C fast enumeration loop (for...
bool isCompilingModule() const
Are we compiling a module interface (.cppm or module map)?
Definition: LangOptions.h:166
TranslationUnitDecl - The top declaration context.
Definition: Decl.h:80
unsigned getTargetAddressSpace(QualType T) const
Definition: ASTContext.h:2321
A reference to a declared variable, function, enum, etc.
Definition: Expr.h:953
GVALinkage
A more specific kind of linkage than enum Linkage.
Definition: Linkage.h:75
const llvm::Triple & getTriple() const
QualType getConstantArrayType(QualType EltTy, const llvm::APInt &ArySize, ArrayType::ArraySizeModifier ASM, unsigned IndexTypeQuals) const
Return the unique reference to the type for a constant array of the specified element type...
virtual unsigned getGlobalVarAddressSpace(CodeGenModule &CGM, const VarDecl *D) const
Get target favored AST address space of a global variable for languages other than OpenCL and CUDA...
Definition: TargetInfo.cpp:423
varlist_range varlists()
Definition: DeclOpenMP.h:77
static llvm::Constant * GetPointerConstant(llvm::LLVMContext &Context, const void *Ptr)
Turns the given pointer into a constant.
CodeGenVTables & getVTables()
SourceLocation getLocation() const
Definition: DeclBase.h:407
NamedDecl - This represents a decl with a name.
Definition: Decl.h:213
ObjCIvarDecl * all_declared_ivar_begin()
all_declared_ivar_begin - return first ivar declared in this class, its extensions and its implementa...
Definition: DeclObjC.cpp:1543
void setAccess(AccessSpecifier AS)
Definition: DeclBase.h:446
static void replaceUsesOfNonProtoConstant(llvm::Constant *old, llvm::Function *newFn)
Replace the uses of a function that was declared with a non-proto type.
bool DeclMustBeEmitted(const Decl *D)
Determines if the decl can be CodeGen'ed or deserialized from PCH lazily, only when used; this is onl...
DefinitionKind hasDefinition(ASTContext &) const
Check whether this variable is defined in this translation unit.
Definition: Decl.cpp:2078
A Microsoft C++ __uuidof expression, which gets the _GUID that corresponds to the supplied type or ex...
Definition: ExprCXX.h:799
CharUnits getAlignOfGlobalVarInChars(QualType T) const
Return the alignment in characters that should be given to a global variable with type T...
void EmitCfiCheckStub()
Emit a stub for the cross-DSO CFI check function.
Definition: CGExpr.cpp:2873
bool isNull() const
Return true if this QualType doesn't point to a type yet.
Definition: Type.h:683
void mangleCtorBlock(const CXXConstructorDecl *CD, CXXCtorType CT, const BlockDecl *BD, raw_ostream &Out)
Definition: Mangle.cpp:206
static FieldDecl * Create(const ASTContext &C, DeclContext *DC, SourceLocation StartLoc, SourceLocation IdLoc, IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo, Expr *BW, bool Mutable, InClassInitStyle InitStyle)
Definition: Decl.cpp:3574
SourceLocation getLocStart() const LLVM_READONLY
Definition: Stmt.cpp:257
This represents '#pragma omp threadprivate ...' directive.
Definition: DeclOpenMP.h:39
No in-class initializer.
Definition: Specifiers.h:226
Represents the canonical version of C arrays with a specified constant size.
Definition: Type.h:2553
This class handles loading and caching of source files into memory.
const CXXDestructorDecl * getDestructor() const
Definition: ExprCXX.h:1114
QualType getBaseElementType(const ArrayType *VAT) const
Return the innermost element type of an array type.
void EmitGlobal(GlobalDecl D)
Emit code for a singal global function or var decl.
Defines enum values for all the target-independent builtin functions.
const NamedDecl * Result
Definition: USRFinder.cpp:70
void AddDependentLib(StringRef Lib)
Appends a dependent lib to the "llvm.linker.options" metadata value.
llvm::GlobalValue::LinkageTypes getLLVMLinkageForDeclarator(const DeclaratorDecl *D, GVALinkage Linkage, bool IsConstantVariable)
Returns LLVM linkage for a declarator.
Attr - This represents one attribute.
Definition: Attr.h:43
APValue * getMaterializedTemporaryValue(const MaterializeTemporaryExpr *E, bool MayCreate)
Get the storage for the constant value of a materialized temporary of static storage duration...
llvm::MDNode * getTBAAInfoForVTablePtr()
PrettyStackTraceDecl - If a crash occurs, indicate that it happened when doing something to a specifi...
Definition: DeclBase.h:1130
unsigned getNumIvarInitializers() const
getNumArgs - Number of ivars which must be initialized.
Definition: DeclObjC.h:2528
static CharUnits getDeclAlign(Expr *E, CharUnits TypeAlign, ASTContext &Context)
A helper function to get the alignment of a Decl referred to by DeclRefExpr or MemberExpr.
CGObjCRuntime * CreateGNUObjCRuntime(CodeGenModule &CGM)
Creates an instance of an Objective-C runtime class.
Definition: CGObjCGNU.cpp:2897
bool isPointerType() const
Definition: Type.h:5712
static LLVM_READONLY bool isHexDigit(unsigned char c)
Return true if this character is an ASCII hex digit: [0-9a-fA-F].
Definition: CharInfo.h:124
llvm::FunctionType * GetFunctionType(const CGFunctionInfo &Info)
GetFunctionType - Get the LLVM function type for.
Definition: CGCall.cpp:1519
bool hasInit() const
Definition: Decl.cpp:2101
QualType getCFConstantStringType() const
Return the C structure type used to represent constant CFStrings.
PresumedLoc getPresumedLoc(SourceLocation Loc, bool UseLineDirectives=true) const
Returns the "presumed" location of a SourceLocation specifies.