Bug Summary

File:tools/clang/lib/CodeGen/CodeGenModule.cpp
Location:line 1174, column 24
Description:Value stored to 'GV' during its initialization is never read

Annotated Source Code

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 "CodeGenFunction.h"
24#include "CodeGenPGO.h"
25#include "CodeGenTBAA.h"
26#include "CoverageMappingGen.h"
27#include "TargetInfo.h"
28#include "clang/AST/ASTContext.h"
29#include "clang/AST/CharUnits.h"
30#include "clang/AST/DeclCXX.h"
31#include "clang/AST/DeclObjC.h"
32#include "clang/AST/DeclTemplate.h"
33#include "clang/AST/Mangle.h"
34#include "clang/AST/RecordLayout.h"
35#include "clang/AST/RecursiveASTVisitor.h"
36#include "clang/Basic/Builtins.h"
37#include "clang/Basic/CharInfo.h"
38#include "clang/Basic/Diagnostic.h"
39#include "clang/Basic/Module.h"
40#include "clang/Basic/SourceManager.h"
41#include "clang/Basic/TargetInfo.h"
42#include "clang/Basic/Version.h"
43#include "clang/Frontend/CodeGenOptions.h"
44#include "clang/Sema/SemaDiagnostic.h"
45#include "llvm/ADT/APSInt.h"
46#include "llvm/ADT/Triple.h"
47#include "llvm/IR/CallSite.h"
48#include "llvm/IR/CallingConv.h"
49#include "llvm/IR/DataLayout.h"
50#include "llvm/IR/Intrinsics.h"
51#include "llvm/IR/LLVMContext.h"
52#include "llvm/IR/Module.h"
53#include "llvm/ProfileData/InstrProfReader.h"
54#include "llvm/Support/ConvertUTF.h"
55#include "llvm/Support/ErrorHandling.h"
56
57using namespace clang;
58using namespace CodeGen;
59
60static const char AnnotationSection[] = "llvm.metadata";
61
62static CGCXXABI *createCXXABI(CodeGenModule &CGM) {
63 switch (CGM.getTarget().getCXXABI().getKind()) {
64 case TargetCXXABI::GenericAArch64:
65 case TargetCXXABI::GenericARM:
66 case TargetCXXABI::iOS:
67 case TargetCXXABI::iOS64:
68 case TargetCXXABI::WatchOS:
69 case TargetCXXABI::GenericMIPS:
70 case TargetCXXABI::GenericItanium:
71 case TargetCXXABI::WebAssembly:
72 return CreateItaniumCXXABI(CGM);
73 case TargetCXXABI::Microsoft:
74 return CreateMicrosoftCXXABI(CGM);
75 }
76
77 llvm_unreachable("invalid C++ ABI kind")::llvm::llvm_unreachable_internal("invalid C++ ABI kind", "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 77)
;
78}
79
80CodeGenModule::CodeGenModule(ASTContext &C, const HeaderSearchOptions &HSO,
81 const PreprocessorOptions &PPO,
82 const CodeGenOptions &CGO, llvm::Module &M,
83 DiagnosticsEngine &diags,
84 CoverageSourceInfo *CoverageInfo)
85 : Context(C), LangOpts(C.getLangOpts()), HeaderSearchOpts(HSO),
86 PreprocessorOpts(PPO), CodeGenOpts(CGO), TheModule(M), Diags(diags),
87 Target(C.getTargetInfo()), ABI(createCXXABI(*this)),
88 VMContext(M.getContext()), TBAA(nullptr), TheTargetCodeGenInfo(nullptr),
89 Types(*this), VTables(*this), ObjCRuntime(nullptr),
90 OpenCLRuntime(nullptr), OpenMPRuntime(nullptr), CUDARuntime(nullptr),
91 DebugInfo(nullptr), ObjCData(nullptr),
92 NoObjCARCExceptionsMetadata(nullptr), PGOReader(nullptr),
93 CFConstantStringClassRef(nullptr), ConstantStringClassRef(nullptr),
94 NSConstantStringType(nullptr), NSConcreteGlobalBlock(nullptr),
95 NSConcreteStackBlock(nullptr), BlockObjectAssign(nullptr),
96 BlockObjectDispose(nullptr), BlockDescriptorType(nullptr),
97 GenericBlockLiteralType(nullptr), LifetimeStartFn(nullptr),
98 LifetimeEndFn(nullptr), SanitizerMD(new SanitizerMetadata(*this)) {
99
100 // Initialize the type cache.
101 llvm::LLVMContext &LLVMContext = M.getContext();
102 VoidTy = llvm::Type::getVoidTy(LLVMContext);
103 Int8Ty = llvm::Type::getInt8Ty(LLVMContext);
104 Int16Ty = llvm::Type::getInt16Ty(LLVMContext);
105 Int32Ty = llvm::Type::getInt32Ty(LLVMContext);
106 Int64Ty = llvm::Type::getInt64Ty(LLVMContext);
107 FloatTy = llvm::Type::getFloatTy(LLVMContext);
108 DoubleTy = llvm::Type::getDoubleTy(LLVMContext);
109 PointerWidthInBits = C.getTargetInfo().getPointerWidth(0);
110 PointerAlignInBytes =
111 C.toCharUnitsFromBits(C.getTargetInfo().getPointerAlign(0)).getQuantity();
112 IntAlignInBytes =
113 C.toCharUnitsFromBits(C.getTargetInfo().getIntAlign()).getQuantity();
114 IntTy = llvm::IntegerType::get(LLVMContext, C.getTargetInfo().getIntWidth());
115 IntPtrTy = llvm::IntegerType::get(LLVMContext, PointerWidthInBits);
116 Int8PtrTy = Int8Ty->getPointerTo(0);
117 Int8PtrPtrTy = Int8PtrTy->getPointerTo(0);
118
119 RuntimeCC = getTargetCodeGenInfo().getABIInfo().getRuntimeCC();
120 BuiltinCC = getTargetCodeGenInfo().getABIInfo().getBuiltinCC();
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 = 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 ||
141 CodeGenOpts.EmitGcovNotes)
142 DebugInfo = new CGDebugInfo(*this);
143
144 Block.GlobalUniqueCount = 0;
145
146 if (C.getLangOpts().ObjC1)
147 ObjCData = new ObjCEntrypoints();
148
149 if (!CodeGenOpts.InstrProfileInput.empty()) {
150 auto ReaderOrErr =
151 llvm::IndexedInstrProfReader::create(CodeGenOpts.InstrProfileInput);
152 if (std::error_code EC = ReaderOrErr.getError()) {
153 unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
154 "Could not read profile %0: %1");
155 getDiags().Report(DiagID) << CodeGenOpts.InstrProfileInput
156 << EC.message();
157 } else
158 PGOReader = std::move(ReaderOrErr.get());
159 }
160
161 // If coverage mapping generation is enabled, create the
162 // CoverageMappingModuleGen object.
163 if (CodeGenOpts.CoverageMapping)
164 CoverageMapping.reset(new CoverageMappingModuleGen(*this, *CoverageInfo));
165}
166
167CodeGenModule::~CodeGenModule() {
168 delete ObjCRuntime;
169 delete OpenCLRuntime;
170 delete OpenMPRuntime;
171 delete CUDARuntime;
172 delete TheTargetCodeGenInfo;
173 delete TBAA;
174 delete DebugInfo;
175 delete ObjCData;
176}
177
178void CodeGenModule::createObjCRuntime() {
179 // This is just isGNUFamily(), but we want to force implementors of
180 // new ABIs to decide how best to do this.
181 switch (LangOpts.ObjCRuntime.getKind()) {
182 case ObjCRuntime::GNUstep:
183 case ObjCRuntime::GCC:
184 case ObjCRuntime::ObjFW:
185 ObjCRuntime = CreateGNUObjCRuntime(*this);
186 return;
187
188 case ObjCRuntime::FragileMacOSX:
189 case ObjCRuntime::MacOSX:
190 case ObjCRuntime::iOS:
191 case ObjCRuntime::WatchOS:
192 ObjCRuntime = CreateMacObjCRuntime(*this);
193 return;
194 }
195 llvm_unreachable("bad runtime kind")::llvm::llvm_unreachable_internal("bad runtime kind", "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 195)
;
196}
197
198void CodeGenModule::createOpenCLRuntime() {
199 OpenCLRuntime = new CGOpenCLRuntime(*this);
200}
201
202void CodeGenModule::createOpenMPRuntime() {
203 OpenMPRuntime = new CGOpenMPRuntime(*this);
204}
205
206void CodeGenModule::createCUDARuntime() {
207 CUDARuntime = CreateNVCUDARuntime(*this);
208}
209
210void CodeGenModule::addReplacement(StringRef Name, llvm::Constant *C) {
211 Replacements[Name] = C;
212}
213
214void CodeGenModule::applyReplacements() {
215 for (auto &I : Replacements) {
216 StringRef MangledName = I.first();
217 llvm::Constant *Replacement = I.second;
218 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
219 if (!Entry)
220 continue;
221 auto *OldF = cast<llvm::Function>(Entry);
222 auto *NewF = dyn_cast<llvm::Function>(Replacement);
223 if (!NewF) {
224 if (auto *Alias = dyn_cast<llvm::GlobalAlias>(Replacement)) {
225 NewF = dyn_cast<llvm::Function>(Alias->getAliasee());
226 } else {
227 auto *CE = cast<llvm::ConstantExpr>(Replacement);
228 assert(CE->getOpcode() == llvm::Instruction::BitCast ||((CE->getOpcode() == llvm::Instruction::BitCast || CE->
getOpcode() == llvm::Instruction::GetElementPtr) ? static_cast
<void> (0) : __assert_fail ("CE->getOpcode() == llvm::Instruction::BitCast || CE->getOpcode() == llvm::Instruction::GetElementPtr"
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 229, __PRETTY_FUNCTION__))
229 CE->getOpcode() == llvm::Instruction::GetElementPtr)((CE->getOpcode() == llvm::Instruction::BitCast || CE->
getOpcode() == llvm::Instruction::GetElementPtr) ? static_cast
<void> (0) : __assert_fail ("CE->getOpcode() == llvm::Instruction::BitCast || CE->getOpcode() == llvm::Instruction::GetElementPtr"
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 229, __PRETTY_FUNCTION__))
;
230 NewF = dyn_cast<llvm::Function>(CE->getOperand(0));
231 }
232 }
233
234 // Replace old with new, but keep the old order.
235 OldF->replaceAllUsesWith(Replacement);
236 if (NewF) {
237 NewF->removeFromParent();
238 OldF->getParent()->getFunctionList().insertAfter(OldF->getIterator(),
239 NewF);
240 }
241 OldF->eraseFromParent();
242 }
243}
244
245void CodeGenModule::addGlobalValReplacement(llvm::GlobalValue *GV, llvm::Constant *C) {
246 GlobalValReplacements.push_back(std::make_pair(GV, C));
247}
248
249void CodeGenModule::applyGlobalValReplacements() {
250 for (auto &I : GlobalValReplacements) {
251 llvm::GlobalValue *GV = I.first;
252 llvm::Constant *C = I.second;
253
254 GV->replaceAllUsesWith(C);
255 GV->eraseFromParent();
256 }
257}
258
259// This is only used in aliases that we created and we know they have a
260// linear structure.
261static const llvm::GlobalObject *getAliasedGlobal(const llvm::GlobalAlias &GA) {
262 llvm::SmallPtrSet<const llvm::GlobalAlias*, 4> Visited;
263 const llvm::Constant *C = &GA;
264 for (;;) {
265 C = C->stripPointerCasts();
266 if (auto *GO = dyn_cast<llvm::GlobalObject>(C))
267 return GO;
268 // stripPointerCasts will not walk over weak aliases.
269 auto *GA2 = dyn_cast<llvm::GlobalAlias>(C);
270 if (!GA2)
271 return nullptr;
272 if (!Visited.insert(GA2).second)
273 return nullptr;
274 C = GA2->getAliasee();
275 }
276}
277
278void CodeGenModule::checkAliases() {
279 // Check if the constructed aliases are well formed. It is really unfortunate
280 // that we have to do this in CodeGen, but we only construct mangled names
281 // and aliases during codegen.
282 bool Error = false;
283 DiagnosticsEngine &Diags = getDiags();
284 for (const GlobalDecl &GD : Aliases) {
285 const auto *D = cast<ValueDecl>(GD.getDecl());
286 const AliasAttr *AA = D->getAttr<AliasAttr>();
287 StringRef MangledName = getMangledName(GD);
288 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
289 auto *Alias = cast<llvm::GlobalAlias>(Entry);
290 const llvm::GlobalValue *GV = getAliasedGlobal(*Alias);
291 if (!GV) {
292 Error = true;
293 Diags.Report(AA->getLocation(), diag::err_cyclic_alias);
294 } else if (GV->isDeclaration()) {
295 Error = true;
296 Diags.Report(AA->getLocation(), diag::err_alias_to_undefined);
297 }
298
299 llvm::Constant *Aliasee = Alias->getAliasee();
300 llvm::GlobalValue *AliaseeGV;
301 if (auto CE = dyn_cast<llvm::ConstantExpr>(Aliasee))
302 AliaseeGV = cast<llvm::GlobalValue>(CE->getOperand(0));
303 else
304 AliaseeGV = cast<llvm::GlobalValue>(Aliasee);
305
306 if (const SectionAttr *SA = D->getAttr<SectionAttr>()) {
307 StringRef AliasSection = SA->getName();
308 if (AliasSection != AliaseeGV->getSection())
309 Diags.Report(SA->getLocation(), diag::warn_alias_with_section)
310 << AliasSection;
311 }
312
313 // We have to handle alias to weak aliases in here. LLVM itself disallows
314 // this since the object semantics would not match the IL one. For
315 // compatibility with gcc we implement it by just pointing the alias
316 // to its aliasee's aliasee. We also warn, since the user is probably
317 // expecting the link to be weak.
318 if (auto GA = dyn_cast<llvm::GlobalAlias>(AliaseeGV)) {
319 if (GA->mayBeOverridden()) {
320 Diags.Report(AA->getLocation(), diag::warn_alias_to_weak_alias)
321 << GV->getName() << GA->getName();
322 Aliasee = llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(
323 GA->getAliasee(), Alias->getType());
324 Alias->setAliasee(Aliasee);
325 }
326 }
327 }
328 if (!Error)
329 return;
330
331 for (const GlobalDecl &GD : Aliases) {
332 StringRef MangledName = getMangledName(GD);
333 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
334 auto *Alias = cast<llvm::GlobalAlias>(Entry);
335 Alias->replaceAllUsesWith(llvm::UndefValue::get(Alias->getType()));
336 Alias->eraseFromParent();
337 }
338}
339
340void CodeGenModule::clear() {
341 DeferredDeclsToEmit.clear();
342 if (OpenMPRuntime)
343 OpenMPRuntime->clear();
344}
345
346void InstrProfStats::reportDiagnostics(DiagnosticsEngine &Diags,
347 StringRef MainFile) {
348 if (!hasDiagnostics())
349 return;
350 if (VisitedInMainFile > 0 && VisitedInMainFile == MissingInMainFile) {
351 if (MainFile.empty())
352 MainFile = "<stdin>";
353 Diags.Report(diag::warn_profile_data_unprofiled) << MainFile;
354 } else
355 Diags.Report(diag::warn_profile_data_out_of_date) << Visited << Missing
356 << Mismatched;
357}
358
359void CodeGenModule::Release() {
360 EmitDeferred();
361 applyGlobalValReplacements();
362 applyReplacements();
363 checkAliases();
364 EmitCXXGlobalInitFunc();
365 EmitCXXGlobalDtorFunc();
366 EmitCXXThreadLocalInitFunc();
367 if (ObjCRuntime)
368 if (llvm::Function *ObjCInitFunction = ObjCRuntime->ModuleInitFunction())
369 AddGlobalCtor(ObjCInitFunction);
370 if (Context.getLangOpts().CUDA && !Context.getLangOpts().CUDAIsDevice &&
371 CUDARuntime) {
372 if (llvm::Function *CudaCtorFunction = CUDARuntime->makeModuleCtorFunction())
373 AddGlobalCtor(CudaCtorFunction);
374 if (llvm::Function *CudaDtorFunction = CUDARuntime->makeModuleDtorFunction())
375 AddGlobalDtor(CudaDtorFunction);
376 }
377 if (PGOReader && PGOStats.hasDiagnostics())
378 PGOStats.reportDiagnostics(getDiags(), getCodeGenOpts().MainFileName);
379 EmitCtorList(GlobalCtors, "llvm.global_ctors");
380 EmitCtorList(GlobalDtors, "llvm.global_dtors");
381 EmitGlobalAnnotations();
382 EmitStaticExternCAliases();
383 EmitDeferredUnusedCoverageMappings();
384 if (CoverageMapping)
385 CoverageMapping->emit();
386 emitLLVMUsed();
387
388 if (CodeGenOpts.Autolink &&
389 (Context.getLangOpts().Modules || !LinkerOptionsMetadata.empty())) {
390 EmitModuleLinkOptions();
391 }
392 if (CodeGenOpts.DwarfVersion) {
393 // We actually want the latest version when there are conflicts.
394 // We can change from Warning to Latest if such mode is supported.
395 getModule().addModuleFlag(llvm::Module::Warning, "Dwarf Version",
396 CodeGenOpts.DwarfVersion);
397 }
398 if (CodeGenOpts.EmitCodeView) {
399 // Indicate that we want CodeView in the metadata.
400 getModule().addModuleFlag(llvm::Module::Warning, "CodeView", 1);
401 }
402 if (CodeGenOpts.OptimizationLevel > 0 && CodeGenOpts.StrictVTablePointers) {
403 // We don't support LTO with 2 with different StrictVTablePointers
404 // FIXME: we could support it by stripping all the information introduced
405 // by StrictVTablePointers.
406
407 getModule().addModuleFlag(llvm::Module::Error, "StrictVTablePointers",1);
408
409 llvm::Metadata *Ops[2] = {
410 llvm::MDString::get(VMContext, "StrictVTablePointers"),
411 llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
412 llvm::Type::getInt32Ty(VMContext), 1))};
413
414 getModule().addModuleFlag(llvm::Module::Require,
415 "StrictVTablePointersRequirement",
416 llvm::MDNode::get(VMContext, Ops));
417 }
418 if (DebugInfo)
419 // We support a single version in the linked module. The LLVM
420 // parser will drop debug info with a different version number
421 // (and warn about it, too).
422 getModule().addModuleFlag(llvm::Module::Warning, "Debug Info Version",
423 llvm::DEBUG_METADATA_VERSION);
424
425 // We need to record the widths of enums and wchar_t, so that we can generate
426 // the correct build attributes in the ARM backend.
427 llvm::Triple::ArchType Arch = Context.getTargetInfo().getTriple().getArch();
428 if ( Arch == llvm::Triple::arm
429 || Arch == llvm::Triple::armeb
430 || Arch == llvm::Triple::thumb
431 || Arch == llvm::Triple::thumbeb) {
432 // Width of wchar_t in bytes
433 uint64_t WCharWidth =
434 Context.getTypeSizeInChars(Context.getWideCharType()).getQuantity();
435 getModule().addModuleFlag(llvm::Module::Error, "wchar_size", WCharWidth);
436
437 // The minimum width of an enum in bytes
438 uint64_t EnumWidth = Context.getLangOpts().ShortEnums ? 1 : 4;
439 getModule().addModuleFlag(llvm::Module::Error, "min_enum_size", EnumWidth);
440 }
441
442 if (uint32_t PLevel = Context.getLangOpts().PICLevel) {
443 llvm::PICLevel::Level PL = llvm::PICLevel::Default;
444 switch (PLevel) {
445 case 0: break;
446 case 1: PL = llvm::PICLevel::Small; break;
447 case 2: PL = llvm::PICLevel::Large; break;
448 default: llvm_unreachable("Invalid PIC Level")::llvm::llvm_unreachable_internal("Invalid PIC Level", "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 448)
;
449 }
450
451 getModule().setPICLevel(PL);
452 }
453
454 SimplifyPersonality();
455
456 if (getCodeGenOpts().EmitDeclMetadata)
457 EmitDeclMetadata();
458
459 if (getCodeGenOpts().EmitGcovArcs || getCodeGenOpts().EmitGcovNotes)
460 EmitCoverageFile();
461
462 if (DebugInfo)
463 DebugInfo->finalize();
464
465 EmitVersionIdentMetadata();
466
467 EmitTargetMetadata();
468}
469
470void CodeGenModule::UpdateCompletedType(const TagDecl *TD) {
471 // Make sure that this type is translated.
472 Types.UpdateCompletedType(TD);
473}
474
475llvm::MDNode *CodeGenModule::getTBAAInfo(QualType QTy) {
476 if (!TBAA)
477 return nullptr;
478 return TBAA->getTBAAInfo(QTy);
479}
480
481llvm::MDNode *CodeGenModule::getTBAAInfoForVTablePtr() {
482 if (!TBAA)
483 return nullptr;
484 return TBAA->getTBAAInfoForVTablePtr();
485}
486
487llvm::MDNode *CodeGenModule::getTBAAStructInfo(QualType QTy) {
488 if (!TBAA)
489 return nullptr;
490 return TBAA->getTBAAStructInfo(QTy);
491}
492
493llvm::MDNode *CodeGenModule::getTBAAStructTagInfo(QualType BaseTy,
494 llvm::MDNode *AccessN,
495 uint64_t O) {
496 if (!TBAA)
497 return nullptr;
498 return TBAA->getTBAAStructTagInfo(BaseTy, AccessN, O);
499}
500
501/// Decorate the instruction with a TBAA tag. For both scalar TBAA
502/// and struct-path aware TBAA, the tag has the same format:
503/// base type, access type and offset.
504/// When ConvertTypeToTag is true, we create a tag based on the scalar type.
505void CodeGenModule::DecorateInstructionWithTBAA(llvm::Instruction *Inst,
506 llvm::MDNode *TBAAInfo,
507 bool ConvertTypeToTag) {
508 if (ConvertTypeToTag && TBAA)
509 Inst->setMetadata(llvm::LLVMContext::MD_tbaa,
510 TBAA->getTBAAScalarTagInfo(TBAAInfo));
511 else
512 Inst->setMetadata(llvm::LLVMContext::MD_tbaa, TBAAInfo);
513}
514
515void CodeGenModule::DecorateInstructionWithInvariantGroup(
516 llvm::Instruction *I, const CXXRecordDecl *RD) {
517 llvm::Metadata *MD = CreateMetadataIdentifierForType(QualType(RD->getTypeForDecl(), 0));
518 auto *MetaDataNode = dyn_cast<llvm::MDNode>(MD);
519 // Check if we have to wrap MDString in MDNode.
520 if (!MetaDataNode)
521 MetaDataNode = llvm::MDNode::get(getLLVMContext(), MD);
522 I->setMetadata(llvm::LLVMContext::MD_invariant_group, MetaDataNode);
523}
524
525void CodeGenModule::Error(SourceLocation loc, StringRef message) {
526 unsigned diagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error, "%0");
527 getDiags().Report(Context.getFullLoc(loc), diagID) << message;
528}
529
530/// ErrorUnsupported - Print out an error that codegen doesn't support the
531/// specified stmt yet.
532void CodeGenModule::ErrorUnsupported(const Stmt *S, const char *Type) {
533 unsigned DiagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error,
534 "cannot compile this %0 yet");
535 std::string Msg = Type;
536 getDiags().Report(Context.getFullLoc(S->getLocStart()), DiagID)
537 << Msg << S->getSourceRange();
538}
539
540/// ErrorUnsupported - Print out an error that codegen doesn't support the
541/// specified decl yet.
542void CodeGenModule::ErrorUnsupported(const Decl *D, const char *Type) {
543 unsigned DiagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error,
544 "cannot compile this %0 yet");
545 std::string Msg = Type;
546 getDiags().Report(Context.getFullLoc(D->getLocation()), DiagID) << Msg;
547}
548
549llvm::ConstantInt *CodeGenModule::getSize(CharUnits size) {
550 return llvm::ConstantInt::get(SizeTy, size.getQuantity());
551}
552
553void CodeGenModule::setGlobalVisibility(llvm::GlobalValue *GV,
554 const NamedDecl *D) const {
555 // Internal definitions always have default visibility.
556 if (GV->hasLocalLinkage()) {
557 GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
558 return;
559 }
560
561 // Set visibility for definitions.
562 LinkageInfo LV = D->getLinkageAndVisibility();
563 if (LV.isVisibilityExplicit() || !GV->hasAvailableExternallyLinkage())
564 GV->setVisibility(GetLLVMVisibility(LV.getVisibility()));
565}
566
567static llvm::GlobalVariable::ThreadLocalMode GetLLVMTLSModel(StringRef S) {
568 return llvm::StringSwitch<llvm::GlobalVariable::ThreadLocalMode>(S)
569 .Case("global-dynamic", llvm::GlobalVariable::GeneralDynamicTLSModel)
570 .Case("local-dynamic", llvm::GlobalVariable::LocalDynamicTLSModel)
571 .Case("initial-exec", llvm::GlobalVariable::InitialExecTLSModel)
572 .Case("local-exec", llvm::GlobalVariable::LocalExecTLSModel);
573}
574
575static llvm::GlobalVariable::ThreadLocalMode GetLLVMTLSModel(
576 CodeGenOptions::TLSModel M) {
577 switch (M) {
578 case CodeGenOptions::GeneralDynamicTLSModel:
579 return llvm::GlobalVariable::GeneralDynamicTLSModel;
580 case CodeGenOptions::LocalDynamicTLSModel:
581 return llvm::GlobalVariable::LocalDynamicTLSModel;
582 case CodeGenOptions::InitialExecTLSModel:
583 return llvm::GlobalVariable::InitialExecTLSModel;
584 case CodeGenOptions::LocalExecTLSModel:
585 return llvm::GlobalVariable::LocalExecTLSModel;
586 }
587 llvm_unreachable("Invalid TLS model!")::llvm::llvm_unreachable_internal("Invalid TLS model!", "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 587)
;
588}
589
590void CodeGenModule::setTLSMode(llvm::GlobalValue *GV, const VarDecl &D) const {
591 assert(D.getTLSKind() && "setting TLS mode on non-TLS var!")((D.getTLSKind() && "setting TLS mode on non-TLS var!"
) ? static_cast<void> (0) : __assert_fail ("D.getTLSKind() && \"setting TLS mode on non-TLS var!\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 591, __PRETTY_FUNCTION__))
;
592
593 llvm::GlobalValue::ThreadLocalMode TLM;
594 TLM = GetLLVMTLSModel(CodeGenOpts.getDefaultTLSModel());
595
596 // Override the TLS model if it is explicitly specified.
597 if (const TLSModelAttr *Attr = D.getAttr<TLSModelAttr>()) {
598 TLM = GetLLVMTLSModel(Attr->getModel());
599 }
600
601 GV->setThreadLocalMode(TLM);
602}
603
604StringRef CodeGenModule::getMangledName(GlobalDecl GD) {
605 StringRef &FoundStr = MangledDeclNames[GD.getCanonicalDecl()];
606 if (!FoundStr.empty())
607 return FoundStr;
608
609 const auto *ND = cast<NamedDecl>(GD.getDecl());
610 SmallString<256> Buffer;
611 StringRef Str;
612 if (getCXXABI().getMangleContext().shouldMangleDeclName(ND)) {
613 llvm::raw_svector_ostream Out(Buffer);
614 if (const auto *D = dyn_cast<CXXConstructorDecl>(ND))
615 getCXXABI().getMangleContext().mangleCXXCtor(D, GD.getCtorType(), Out);
616 else if (const auto *D = dyn_cast<CXXDestructorDecl>(ND))
617 getCXXABI().getMangleContext().mangleCXXDtor(D, GD.getDtorType(), Out);
618 else
619 getCXXABI().getMangleContext().mangleName(ND, Out);
620 Str = Out.str();
621 } else {
622 IdentifierInfo *II = ND->getIdentifier();
623 assert(II && "Attempt to mangle unnamed decl.")((II && "Attempt to mangle unnamed decl.") ? static_cast
<void> (0) : __assert_fail ("II && \"Attempt to mangle unnamed decl.\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 623, __PRETTY_FUNCTION__))
;
624 Str = II->getName();
625 }
626
627 // Keep the first result in the case of a mangling collision.
628 auto Result = Manglings.insert(std::make_pair(Str, GD));
629 return FoundStr = Result.first->first();
630}
631
632StringRef CodeGenModule::getBlockMangledName(GlobalDecl GD,
633 const BlockDecl *BD) {
634 MangleContext &MangleCtx = getCXXABI().getMangleContext();
635 const Decl *D = GD.getDecl();
636
637 SmallString<256> Buffer;
638 llvm::raw_svector_ostream Out(Buffer);
639 if (!D)
640 MangleCtx.mangleGlobalBlock(BD,
641 dyn_cast_or_null<VarDecl>(initializedGlobalDecl.getDecl()), Out);
642 else if (const auto *CD = dyn_cast<CXXConstructorDecl>(D))
643 MangleCtx.mangleCtorBlock(CD, GD.getCtorType(), BD, Out);
644 else if (const auto *DD = dyn_cast<CXXDestructorDecl>(D))
645 MangleCtx.mangleDtorBlock(DD, GD.getDtorType(), BD, Out);
646 else
647 MangleCtx.mangleBlock(cast<DeclContext>(D), BD, Out);
648
649 auto Result = Manglings.insert(std::make_pair(Out.str(), BD));
650 return Result.first->first();
651}
652
653llvm::GlobalValue *CodeGenModule::GetGlobalValue(StringRef Name) {
654 return getModule().getNamedValue(Name);
655}
656
657/// AddGlobalCtor - Add a function to the list that will be called before
658/// main() runs.
659void CodeGenModule::AddGlobalCtor(llvm::Function *Ctor, int Priority,
660 llvm::Constant *AssociatedData) {
661 // FIXME: Type coercion of void()* types.
662 GlobalCtors.push_back(Structor(Priority, Ctor, AssociatedData));
663}
664
665/// AddGlobalDtor - Add a function to the list that will be called
666/// when the module is unloaded.
667void CodeGenModule::AddGlobalDtor(llvm::Function *Dtor, int Priority) {
668 // FIXME: Type coercion of void()* types.
669 GlobalDtors.push_back(Structor(Priority, Dtor, nullptr));
670}
671
672void CodeGenModule::EmitCtorList(const CtorList &Fns, const char *GlobalName) {
673 // Ctor function type is void()*.
674 llvm::FunctionType* CtorFTy = llvm::FunctionType::get(VoidTy, false);
675 llvm::Type *CtorPFTy = llvm::PointerType::getUnqual(CtorFTy);
676
677 // Get the type of a ctor entry, { i32, void ()*, i8* }.
678 llvm::StructType *CtorStructTy = llvm::StructType::get(
679 Int32Ty, llvm::PointerType::getUnqual(CtorFTy), VoidPtrTy, nullptr);
680
681 // Construct the constructor and destructor arrays.
682 SmallVector<llvm::Constant *, 8> Ctors;
683 for (const auto &I : Fns) {
684 llvm::Constant *S[] = {
685 llvm::ConstantInt::get(Int32Ty, I.Priority, false),
686 llvm::ConstantExpr::getBitCast(I.Initializer, CtorPFTy),
687 (I.AssociatedData
688 ? llvm::ConstantExpr::getBitCast(I.AssociatedData, VoidPtrTy)
689 : llvm::Constant::getNullValue(VoidPtrTy))};
690 Ctors.push_back(llvm::ConstantStruct::get(CtorStructTy, S));
691 }
692
693 if (!Ctors.empty()) {
694 llvm::ArrayType *AT = llvm::ArrayType::get(CtorStructTy, Ctors.size());
695 new llvm::GlobalVariable(TheModule, AT, false,
696 llvm::GlobalValue::AppendingLinkage,
697 llvm::ConstantArray::get(AT, Ctors),
698 GlobalName);
699 }
700}
701
702llvm::GlobalValue::LinkageTypes
703CodeGenModule::getFunctionLinkage(GlobalDecl GD) {
704 const auto *D = cast<FunctionDecl>(GD.getDecl());
705
706 GVALinkage Linkage = getContext().GetGVALinkageForFunction(D);
707
708 if (isa<CXXDestructorDecl>(D) &&
709 getCXXABI().useThunkForDtorVariant(cast<CXXDestructorDecl>(D),
710 GD.getDtorType())) {
711 // Destructor variants in the Microsoft C++ ABI are always internal or
712 // linkonce_odr thunks emitted on an as-needed basis.
713 return Linkage == GVA_Internal ? llvm::GlobalValue::InternalLinkage
714 : llvm::GlobalValue::LinkOnceODRLinkage;
715 }
716
717 return getLLVMLinkageForDeclarator(D, Linkage, /*isConstantVariable=*/false);
718}
719
720void CodeGenModule::setFunctionDLLStorageClass(GlobalDecl GD, llvm::Function *F) {
721 const auto *FD = cast<FunctionDecl>(GD.getDecl());
722
723 if (const auto *Dtor = dyn_cast_or_null<CXXDestructorDecl>(FD)) {
724 if (getCXXABI().useThunkForDtorVariant(Dtor, GD.getDtorType())) {
725 // Don't dllexport/import destructor thunks.
726 F->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
727 return;
728 }
729 }
730
731 if (FD->hasAttr<DLLImportAttr>())
732 F->setDLLStorageClass(llvm::GlobalVariable::DLLImportStorageClass);
733 else if (FD->hasAttr<DLLExportAttr>())
734 F->setDLLStorageClass(llvm::GlobalVariable::DLLExportStorageClass);
735 else
736 F->setDLLStorageClass(llvm::GlobalVariable::DefaultStorageClass);
737}
738
739void CodeGenModule::setFunctionDefinitionAttributes(const FunctionDecl *D,
740 llvm::Function *F) {
741 setNonAliasAttributes(D, F);
742}
743
744void CodeGenModule::SetLLVMFunctionAttributes(const Decl *D,
745 const CGFunctionInfo &Info,
746 llvm::Function *F) {
747 unsigned CallingConv;
748 AttributeListType AttributeList;
749 ConstructAttributeList(Info, D, AttributeList, CallingConv, false);
750 F->setAttributes(llvm::AttributeSet::get(getLLVMContext(), AttributeList));
751 F->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv));
752}
753
754/// Determines whether the language options require us to model
755/// unwind exceptions. We treat -fexceptions as mandating this
756/// except under the fragile ObjC ABI with only ObjC exceptions
757/// enabled. This means, for example, that C with -fexceptions
758/// enables this.
759static bool hasUnwindExceptions(const LangOptions &LangOpts) {
760 // If exceptions are completely disabled, obviously this is false.
761 if (!LangOpts.Exceptions) return false;
762
763 // If C++ exceptions are enabled, this is true.
764 if (LangOpts.CXXExceptions) return true;
765
766 // If ObjC exceptions are enabled, this depends on the ABI.
767 if (LangOpts.ObjCExceptions) {
768 return LangOpts.ObjCRuntime.hasUnwindExceptions();
769 }
770
771 return true;
772}
773
774void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D,
775 llvm::Function *F) {
776 llvm::AttrBuilder B;
777
778 if (CodeGenOpts.UnwindTables)
779 B.addAttribute(llvm::Attribute::UWTable);
780
781 if (!hasUnwindExceptions(LangOpts))
782 B.addAttribute(llvm::Attribute::NoUnwind);
783
784 if (LangOpts.getStackProtector() == LangOptions::SSPOn)
785 B.addAttribute(llvm::Attribute::StackProtect);
786 else if (LangOpts.getStackProtector() == LangOptions::SSPStrong)
787 B.addAttribute(llvm::Attribute::StackProtectStrong);
788 else if (LangOpts.getStackProtector() == LangOptions::SSPReq)
789 B.addAttribute(llvm::Attribute::StackProtectReq);
790
791 if (!D) {
792 F->addAttributes(llvm::AttributeSet::FunctionIndex,
793 llvm::AttributeSet::get(
794 F->getContext(),
795 llvm::AttributeSet::FunctionIndex, B));
796 return;
797 }
798
799 if (D->hasAttr<NakedAttr>()) {
800 // Naked implies noinline: we should not be inlining such functions.
801 B.addAttribute(llvm::Attribute::Naked);
802 B.addAttribute(llvm::Attribute::NoInline);
803 } else if (D->hasAttr<NoDuplicateAttr>()) {
804 B.addAttribute(llvm::Attribute::NoDuplicate);
805 } else if (D->hasAttr<NoInlineAttr>()) {
806 B.addAttribute(llvm::Attribute::NoInline);
807 } else if (D->hasAttr<AlwaysInlineAttr>() &&
808 !F->getAttributes().hasAttribute(llvm::AttributeSet::FunctionIndex,
809 llvm::Attribute::NoInline)) {
810 // (noinline wins over always_inline, and we can't specify both in IR)
811 B.addAttribute(llvm::Attribute::AlwaysInline);
812 }
813
814 if (D->hasAttr<ColdAttr>()) {
815 if (!D->hasAttr<OptimizeNoneAttr>())
816 B.addAttribute(llvm::Attribute::OptimizeForSize);
817 B.addAttribute(llvm::Attribute::Cold);
818 }
819
820 if (D->hasAttr<MinSizeAttr>())
821 B.addAttribute(llvm::Attribute::MinSize);
822
823 F->addAttributes(llvm::AttributeSet::FunctionIndex,
824 llvm::AttributeSet::get(
825 F->getContext(), llvm::AttributeSet::FunctionIndex, B));
826
827 if (D->hasAttr<OptimizeNoneAttr>()) {
828 // OptimizeNone implies noinline; we should not be inlining such functions.
829 F->addFnAttr(llvm::Attribute::OptimizeNone);
830 F->addFnAttr(llvm::Attribute::NoInline);
831
832 // OptimizeNone wins over OptimizeForSize, MinSize, AlwaysInline.
833 F->removeFnAttr(llvm::Attribute::OptimizeForSize);
834 F->removeFnAttr(llvm::Attribute::MinSize);
835 assert(!F->hasFnAttribute(llvm::Attribute::AlwaysInline) &&((!F->hasFnAttribute(llvm::Attribute::AlwaysInline) &&
"OptimizeNone and AlwaysInline on same function!") ? static_cast
<void> (0) : __assert_fail ("!F->hasFnAttribute(llvm::Attribute::AlwaysInline) && \"OptimizeNone and AlwaysInline on same function!\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 836, __PRETTY_FUNCTION__))
836 "OptimizeNone and AlwaysInline on same function!")((!F->hasFnAttribute(llvm::Attribute::AlwaysInline) &&
"OptimizeNone and AlwaysInline on same function!") ? static_cast
<void> (0) : __assert_fail ("!F->hasFnAttribute(llvm::Attribute::AlwaysInline) && \"OptimizeNone and AlwaysInline on same function!\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 836, __PRETTY_FUNCTION__))
;
837
838 // Attribute 'inlinehint' has no effect on 'optnone' functions.
839 // Explicitly remove it from the set of function attributes.
840 F->removeFnAttr(llvm::Attribute::InlineHint);
841 }
842
843 if (isa<CXXConstructorDecl>(D) || isa<CXXDestructorDecl>(D))
844 F->setUnnamedAddr(true);
845 else if (const auto *MD = dyn_cast<CXXMethodDecl>(D))
846 if (MD->isVirtual())
847 F->setUnnamedAddr(true);
848
849 unsigned alignment = D->getMaxAlignment() / Context.getCharWidth();
850 if (alignment)
851 F->setAlignment(alignment);
852
853 // Some C++ ABIs require 2-byte alignment for member functions, in order to
854 // reserve a bit for differentiating between virtual and non-virtual member
855 // functions. If the current target's C++ ABI requires this and this is a
856 // member function, set its alignment accordingly.
857 if (getTarget().getCXXABI().areMemberFunctionsAligned()) {
858 if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D))
859 F->setAlignment(2);
860 }
861}
862
863void CodeGenModule::SetCommonAttributes(const Decl *D,
864 llvm::GlobalValue *GV) {
865 if (const auto *ND = dyn_cast_or_null<NamedDecl>(D))
866 setGlobalVisibility(GV, ND);
867 else
868 GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
869
870 if (D && D->hasAttr<UsedAttr>())
871 addUsedGlobal(GV);
872}
873
874void CodeGenModule::setAliasAttributes(const Decl *D,
875 llvm::GlobalValue *GV) {
876 SetCommonAttributes(D, GV);
877
878 // Process the dllexport attribute based on whether the original definition
879 // (not necessarily the aliasee) was exported.
880 if (D->hasAttr<DLLExportAttr>())
881 GV->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
882}
883
884void CodeGenModule::setNonAliasAttributes(const Decl *D,
885 llvm::GlobalObject *GO) {
886 SetCommonAttributes(D, GO);
887
888 if (D)
889 if (const SectionAttr *SA = D->getAttr<SectionAttr>())
890 GO->setSection(SA->getName());
891
892 getTargetCodeGenInfo().setTargetAttributes(D, GO, *this);
893}
894
895void CodeGenModule::SetInternalFunctionAttributes(const Decl *D,
896 llvm::Function *F,
897 const CGFunctionInfo &FI) {
898 SetLLVMFunctionAttributes(D, FI, F);
899 SetLLVMFunctionAttributesForDefinition(D, F);
900
901 F->setLinkage(llvm::Function::InternalLinkage);
902
903 setNonAliasAttributes(D, F);
904}
905
906static void setLinkageAndVisibilityForGV(llvm::GlobalValue *GV,
907 const NamedDecl *ND) {
908 // Set linkage and visibility in case we never see a definition.
909 LinkageInfo LV = ND->getLinkageAndVisibility();
910 if (LV.getLinkage() != ExternalLinkage) {
911 // Don't set internal linkage on declarations.
912 } else {
913 if (ND->hasAttr<DLLImportAttr>()) {
914 GV->setLinkage(llvm::GlobalValue::ExternalLinkage);
915 GV->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
916 } else if (ND->hasAttr<DLLExportAttr>()) {
917 GV->setLinkage(llvm::GlobalValue::ExternalLinkage);
918 GV->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
919 } else if (ND->hasAttr<WeakAttr>() || ND->isWeakImported()) {
920 // "extern_weak" is overloaded in LLVM; we probably should have
921 // separate linkage types for this.
922 GV->setLinkage(llvm::GlobalValue::ExternalWeakLinkage);
923 }
924
925 // Set visibility on a declaration only if it's explicit.
926 if (LV.isVisibilityExplicit())
927 GV->setVisibility(CodeGenModule::GetLLVMVisibility(LV.getVisibility()));
928 }
929}
930
931void CodeGenModule::SetFunctionAttributes(GlobalDecl GD, llvm::Function *F,
932 bool IsIncompleteFunction,
933 bool IsThunk) {
934 if (llvm::Intrinsic::ID IID = F->getIntrinsicID()) {
935 // If this is an intrinsic function, set the function's attributes
936 // to the intrinsic's attributes.
937 F->setAttributes(llvm::Intrinsic::getAttributes(getLLVMContext(), IID));
938 return;
939 }
940
941 const auto *FD = cast<FunctionDecl>(GD.getDecl());
942
943 if (!IsIncompleteFunction)
944 SetLLVMFunctionAttributes(FD, getTypes().arrangeGlobalDeclaration(GD), F);
945
946 // Add the Returned attribute for "this", except for iOS 5 and earlier
947 // where substantial code, including the libstdc++ dylib, was compiled with
948 // GCC and does not actually return "this".
949 if (!IsThunk && getCXXABI().HasThisReturn(GD) &&
950 !(getTarget().getTriple().isiOS() &&
951 getTarget().getTriple().isOSVersionLT(6))) {
952 assert(!F->arg_empty() &&((!F->arg_empty() && F->arg_begin()->getType
() ->canLosslesslyBitCastTo(F->getReturnType()) &&
"unexpected this return") ? static_cast<void> (0) : __assert_fail
("!F->arg_empty() && F->arg_begin()->getType() ->canLosslesslyBitCastTo(F->getReturnType()) && \"unexpected this return\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 955, __PRETTY_FUNCTION__))
953 F->arg_begin()->getType()((!F->arg_empty() && F->arg_begin()->getType
() ->canLosslesslyBitCastTo(F->getReturnType()) &&
"unexpected this return") ? static_cast<void> (0) : __assert_fail
("!F->arg_empty() && F->arg_begin()->getType() ->canLosslesslyBitCastTo(F->getReturnType()) && \"unexpected this return\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 955, __PRETTY_FUNCTION__))
954 ->canLosslesslyBitCastTo(F->getReturnType()) &&((!F->arg_empty() && F->arg_begin()->getType
() ->canLosslesslyBitCastTo(F->getReturnType()) &&
"unexpected this return") ? static_cast<void> (0) : __assert_fail
("!F->arg_empty() && F->arg_begin()->getType() ->canLosslesslyBitCastTo(F->getReturnType()) && \"unexpected this return\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 955, __PRETTY_FUNCTION__))
955 "unexpected this return")((!F->arg_empty() && F->arg_begin()->getType
() ->canLosslesslyBitCastTo(F->getReturnType()) &&
"unexpected this return") ? static_cast<void> (0) : __assert_fail
("!F->arg_empty() && F->arg_begin()->getType() ->canLosslesslyBitCastTo(F->getReturnType()) && \"unexpected this return\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 955, __PRETTY_FUNCTION__))
;
956 F->addAttribute(1, llvm::Attribute::Returned);
957 }
958
959 // Only a few attributes are set on declarations; these may later be
960 // overridden by a definition.
961
962 setLinkageAndVisibilityForGV(F, FD);
963
964 if (const SectionAttr *SA = FD->getAttr<SectionAttr>())
965 F->setSection(SA->getName());
966
967 // A replaceable global allocation function does not act like a builtin by
968 // default, only if it is invoked by a new-expression or delete-expression.
969 if (FD->isReplaceableGlobalAllocationFunction())
970 F->addAttribute(llvm::AttributeSet::FunctionIndex,
971 llvm::Attribute::NoBuiltin);
972
973 // If we are checking indirect calls and this is not a non-static member
974 // function, emit a bit set entry for the function type.
975 if (LangOpts.Sanitize.has(SanitizerKind::CFIICall) &&
976 !(isa<CXXMethodDecl>(FD) && !cast<CXXMethodDecl>(FD)->isStatic())) {
977 llvm::NamedMDNode *BitsetsMD =
978 getModule().getOrInsertNamedMetadata("llvm.bitsets");
979
980 llvm::Metadata *BitsetOps[] = {
981 CreateMetadataIdentifierForType(FD->getType()),
982 llvm::ConstantAsMetadata::get(F),
983 llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(Int64Ty, 0))};
984 BitsetsMD->addOperand(llvm::MDTuple::get(getLLVMContext(), BitsetOps));
985 }
986}
987
988void CodeGenModule::addUsedGlobal(llvm::GlobalValue *GV) {
989 assert(!GV->isDeclaration() &&((!GV->isDeclaration() && "Only globals with definition can force usage."
) ? static_cast<void> (0) : __assert_fail ("!GV->isDeclaration() && \"Only globals with definition can force usage.\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 990, __PRETTY_FUNCTION__))
990 "Only globals with definition can force usage.")((!GV->isDeclaration() && "Only globals with definition can force usage."
) ? static_cast<void> (0) : __assert_fail ("!GV->isDeclaration() && \"Only globals with definition can force usage.\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 990, __PRETTY_FUNCTION__))
;
991 LLVMUsed.emplace_back(GV);
992}
993
994void CodeGenModule::addCompilerUsedGlobal(llvm::GlobalValue *GV) {
995 assert(!GV->isDeclaration() &&((!GV->isDeclaration() && "Only globals with definition can force usage."
) ? static_cast<void> (0) : __assert_fail ("!GV->isDeclaration() && \"Only globals with definition can force usage.\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 996, __PRETTY_FUNCTION__))
996 "Only globals with definition can force usage.")((!GV->isDeclaration() && "Only globals with definition can force usage."
) ? static_cast<void> (0) : __assert_fail ("!GV->isDeclaration() && \"Only globals with definition can force usage.\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 996, __PRETTY_FUNCTION__))
;
997 LLVMCompilerUsed.emplace_back(GV);
998}
999
1000static void emitUsed(CodeGenModule &CGM, StringRef Name,
1001 std::vector<llvm::WeakVH> &List) {
1002 // Don't create llvm.used if there is no need.
1003 if (List.empty())
1004 return;
1005
1006 // Convert List to what ConstantArray needs.
1007 SmallVector<llvm::Constant*, 8> UsedArray;
1008 UsedArray.resize(List.size());
1009 for (unsigned i = 0, e = List.size(); i != e; ++i) {
1010 UsedArray[i] =
1011 llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(
1012 cast<llvm::Constant>(&*List[i]), CGM.Int8PtrTy);
1013 }
1014
1015 if (UsedArray.empty())
1016 return;
1017 llvm::ArrayType *ATy = llvm::ArrayType::get(CGM.Int8PtrTy, UsedArray.size());
1018
1019 auto *GV = new llvm::GlobalVariable(
1020 CGM.getModule(), ATy, false, llvm::GlobalValue::AppendingLinkage,
1021 llvm::ConstantArray::get(ATy, UsedArray), Name);
1022
1023 GV->setSection("llvm.metadata");
1024}
1025
1026void CodeGenModule::emitLLVMUsed() {
1027 emitUsed(*this, "llvm.used", LLVMUsed);
1028 emitUsed(*this, "llvm.compiler.used", LLVMCompilerUsed);
1029}
1030
1031void CodeGenModule::AppendLinkerOptions(StringRef Opts) {
1032 auto *MDOpts = llvm::MDString::get(getLLVMContext(), Opts);
1033 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
1034}
1035
1036void CodeGenModule::AddDetectMismatch(StringRef Name, StringRef Value) {
1037 llvm::SmallString<32> Opt;
1038 getTargetCodeGenInfo().getDetectMismatchOption(Name, Value, Opt);
1039 auto *MDOpts = llvm::MDString::get(getLLVMContext(), Opt);
1040 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
1041}
1042
1043void CodeGenModule::AddDependentLib(StringRef Lib) {
1044 llvm::SmallString<24> Opt;
1045 getTargetCodeGenInfo().getDependentLibraryOption(Lib, Opt);
1046 auto *MDOpts = llvm::MDString::get(getLLVMContext(), Opt);
1047 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
1048}
1049
1050/// \brief Add link options implied by the given module, including modules
1051/// it depends on, using a postorder walk.
1052static void addLinkOptionsPostorder(CodeGenModule &CGM, Module *Mod,
1053 SmallVectorImpl<llvm::Metadata *> &Metadata,
1054 llvm::SmallPtrSet<Module *, 16> &Visited) {
1055 // Import this module's parent.
1056 if (Mod->Parent && Visited.insert(Mod->Parent).second) {
1057 addLinkOptionsPostorder(CGM, Mod->Parent, Metadata, Visited);
1058 }
1059
1060 // Import this module's dependencies.
1061 for (unsigned I = Mod->Imports.size(); I > 0; --I) {
1062 if (Visited.insert(Mod->Imports[I - 1]).second)
1063 addLinkOptionsPostorder(CGM, Mod->Imports[I-1], Metadata, Visited);
1064 }
1065
1066 // Add linker options to link against the libraries/frameworks
1067 // described by this module.
1068 llvm::LLVMContext &Context = CGM.getLLVMContext();
1069 for (unsigned I = Mod->LinkLibraries.size(); I > 0; --I) {
1070 // Link against a framework. Frameworks are currently Darwin only, so we
1071 // don't to ask TargetCodeGenInfo for the spelling of the linker option.
1072 if (Mod->LinkLibraries[I-1].IsFramework) {
1073 llvm::Metadata *Args[2] = {
1074 llvm::MDString::get(Context, "-framework"),
1075 llvm::MDString::get(Context, Mod->LinkLibraries[I - 1].Library)};
1076
1077 Metadata.push_back(llvm::MDNode::get(Context, Args));
1078 continue;
1079 }
1080
1081 // Link against a library.
1082 llvm::SmallString<24> Opt;
1083 CGM.getTargetCodeGenInfo().getDependentLibraryOption(
1084 Mod->LinkLibraries[I-1].Library, Opt);
1085 auto *OptString = llvm::MDString::get(Context, Opt);
1086 Metadata.push_back(llvm::MDNode::get(Context, OptString));
1087 }
1088}
1089
1090void CodeGenModule::EmitModuleLinkOptions() {
1091 // Collect the set of all of the modules we want to visit to emit link
1092 // options, which is essentially the imported modules and all of their
1093 // non-explicit child modules.
1094 llvm::SetVector<clang::Module *> LinkModules;
1095 llvm::SmallPtrSet<clang::Module *, 16> Visited;
1096 SmallVector<clang::Module *, 16> Stack;
1097
1098 // Seed the stack with imported modules.
1099 for (Module *M : ImportedModules)
1100 if (Visited.insert(M).second)
1101 Stack.push_back(M);
1102
1103 // Find all of the modules to import, making a little effort to prune
1104 // non-leaf modules.
1105 while (!Stack.empty()) {
1106 clang::Module *Mod = Stack.pop_back_val();
1107
1108 bool AnyChildren = false;
1109
1110 // Visit the submodules of this module.
1111 for (clang::Module::submodule_iterator Sub = Mod->submodule_begin(),
1112 SubEnd = Mod->submodule_end();
1113 Sub != SubEnd; ++Sub) {
1114 // Skip explicit children; they need to be explicitly imported to be
1115 // linked against.
1116 if ((*Sub)->IsExplicit)
1117 continue;
1118
1119 if (Visited.insert(*Sub).second) {
1120 Stack.push_back(*Sub);
1121 AnyChildren = true;
1122 }
1123 }
1124
1125 // We didn't find any children, so add this module to the list of
1126 // modules to link against.
1127 if (!AnyChildren) {
1128 LinkModules.insert(Mod);
1129 }
1130 }
1131
1132 // Add link options for all of the imported modules in reverse topological
1133 // order. We don't do anything to try to order import link flags with respect
1134 // to linker options inserted by things like #pragma comment().
1135 SmallVector<llvm::Metadata *, 16> MetadataArgs;
1136 Visited.clear();
1137 for (Module *M : LinkModules)
1138 if (Visited.insert(M).second)
1139 addLinkOptionsPostorder(*this, M, MetadataArgs, Visited);
1140 std::reverse(MetadataArgs.begin(), MetadataArgs.end());
1141 LinkerOptionsMetadata.append(MetadataArgs.begin(), MetadataArgs.end());
1142
1143 // Add the linker options metadata flag.
1144 getModule().addModuleFlag(llvm::Module::AppendUnique, "Linker Options",
1145 llvm::MDNode::get(getLLVMContext(),
1146 LinkerOptionsMetadata));
1147}
1148
1149void CodeGenModule::EmitDeferred() {
1150 // Emit code for any potentially referenced deferred decls. Since a
1151 // previously unused static decl may become used during the generation of code
1152 // for a static function, iterate until no changes are made.
1153
1154 if (!DeferredVTables.empty()) {
1155 EmitDeferredVTables();
1156
1157 // Emitting a v-table doesn't directly cause more v-tables to
1158 // become deferred, although it can cause functions to be
1159 // emitted that then need those v-tables.
1160 assert(DeferredVTables.empty())((DeferredVTables.empty()) ? static_cast<void> (0) : __assert_fail
("DeferredVTables.empty()", "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1160, __PRETTY_FUNCTION__))
;
1161 }
1162
1163 // Stop if we're out of both deferred v-tables and deferred declarations.
1164 if (DeferredDeclsToEmit.empty())
1165 return;
1166
1167 // Grab the list of decls to emit. If EmitGlobalDefinition schedules more
1168 // work, it will not interfere with this.
1169 std::vector<DeferredGlobal> CurDeclsToEmit;
1170 CurDeclsToEmit.swap(DeferredDeclsToEmit);
1171
1172 for (DeferredGlobal &G : CurDeclsToEmit) {
1173 GlobalDecl D = G.GD;
1174 llvm::GlobalValue *GV = G.GV;
Value stored to 'GV' during its initialization is never read
1175 G.GV = nullptr;
1176
1177 // We should call GetAddrOfGlobal with IsForDefinition set to true in order
1178 // to get GlobalValue with exactly the type we need, not something that
1179 // might had been created for another decl with the same mangled name but
1180 // different type.
1181 GV = cast<llvm::GlobalValue>(GetAddrOfGlobal(D, /*IsForDefinition=*/true));
1182
1183 // Check to see if we've already emitted this. This is necessary
1184 // for a couple of reasons: first, decls can end up in the
1185 // deferred-decls queue multiple times, and second, decls can end
1186 // up with definitions in unusual ways (e.g. by an extern inline
1187 // function acquiring a strong function redefinition). Just
1188 // ignore these cases.
1189 if (GV && !GV->isDeclaration())
1190 continue;
1191
1192 // Otherwise, emit the definition and move on to the next one.
1193 EmitGlobalDefinition(D, GV);
1194
1195 // If we found out that we need to emit more decls, do that recursively.
1196 // This has the advantage that the decls are emitted in a DFS and related
1197 // ones are close together, which is convenient for testing.
1198 if (!DeferredVTables.empty() || !DeferredDeclsToEmit.empty()) {
1199 EmitDeferred();
1200 assert(DeferredVTables.empty() && DeferredDeclsToEmit.empty())((DeferredVTables.empty() && DeferredDeclsToEmit.empty
()) ? static_cast<void> (0) : __assert_fail ("DeferredVTables.empty() && DeferredDeclsToEmit.empty()"
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1200, __PRETTY_FUNCTION__))
;
1201 }
1202 }
1203}
1204
1205void CodeGenModule::EmitGlobalAnnotations() {
1206 if (Annotations.empty())
1207 return;
1208
1209 // Create a new global variable for the ConstantStruct in the Module.
1210 llvm::Constant *Array = llvm::ConstantArray::get(llvm::ArrayType::get(
1211 Annotations[0]->getType(), Annotations.size()), Annotations);
1212 auto *gv = new llvm::GlobalVariable(getModule(), Array->getType(), false,
1213 llvm::GlobalValue::AppendingLinkage,
1214 Array, "llvm.global.annotations");
1215 gv->setSection(AnnotationSection);
1216}
1217
1218llvm::Constant *CodeGenModule::EmitAnnotationString(StringRef Str) {
1219 llvm::Constant *&AStr = AnnotationStrings[Str];
1220 if (AStr)
1221 return AStr;
1222
1223 // Not found yet, create a new global.
1224 llvm::Constant *s = llvm::ConstantDataArray::getString(getLLVMContext(), Str);
1225 auto *gv =
1226 new llvm::GlobalVariable(getModule(), s->getType(), true,
1227 llvm::GlobalValue::PrivateLinkage, s, ".str");
1228 gv->setSection(AnnotationSection);
1229 gv->setUnnamedAddr(true);
1230 AStr = gv;
1231 return gv;
1232}
1233
1234llvm::Constant *CodeGenModule::EmitAnnotationUnit(SourceLocation Loc) {
1235 SourceManager &SM = getContext().getSourceManager();
1236 PresumedLoc PLoc = SM.getPresumedLoc(Loc);
1237 if (PLoc.isValid())
1238 return EmitAnnotationString(PLoc.getFilename());
1239 return EmitAnnotationString(SM.getBufferName(Loc));
1240}
1241
1242llvm::Constant *CodeGenModule::EmitAnnotationLineNo(SourceLocation L) {
1243 SourceManager &SM = getContext().getSourceManager();
1244 PresumedLoc PLoc = SM.getPresumedLoc(L);
1245 unsigned LineNo = PLoc.isValid() ? PLoc.getLine() :
1246 SM.getExpansionLineNumber(L);
1247 return llvm::ConstantInt::get(Int32Ty, LineNo);
1248}
1249
1250llvm::Constant *CodeGenModule::EmitAnnotateAttr(llvm::GlobalValue *GV,
1251 const AnnotateAttr *AA,
1252 SourceLocation L) {
1253 // Get the globals for file name, annotation, and the line number.
1254 llvm::Constant *AnnoGV = EmitAnnotationString(AA->getAnnotation()),
1255 *UnitGV = EmitAnnotationUnit(L),
1256 *LineNoCst = EmitAnnotationLineNo(L);
1257
1258 // Create the ConstantStruct for the global annotation.
1259 llvm::Constant *Fields[4] = {
1260 llvm::ConstantExpr::getBitCast(GV, Int8PtrTy),
1261 llvm::ConstantExpr::getBitCast(AnnoGV, Int8PtrTy),
1262 llvm::ConstantExpr::getBitCast(UnitGV, Int8PtrTy),
1263 LineNoCst
1264 };
1265 return llvm::ConstantStruct::getAnon(Fields);
1266}
1267
1268void CodeGenModule::AddGlobalAnnotations(const ValueDecl *D,
1269 llvm::GlobalValue *GV) {
1270 assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute")((D->hasAttr<AnnotateAttr>() && "no annotate attribute"
) ? static_cast<void> (0) : __assert_fail ("D->hasAttr<AnnotateAttr>() && \"no annotate attribute\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1270, __PRETTY_FUNCTION__))
;
1271 // Get the struct elements for these annotations.
1272 for (const auto *I : D->specific_attrs<AnnotateAttr>())
1273 Annotations.push_back(EmitAnnotateAttr(GV, I, D->getLocation()));
1274}
1275
1276bool CodeGenModule::isInSanitizerBlacklist(llvm::Function *Fn,
1277 SourceLocation Loc) const {
1278 const auto &SanitizerBL = getContext().getSanitizerBlacklist();
1279 // Blacklist by function name.
1280 if (SanitizerBL.isBlacklistedFunction(Fn->getName()))
1281 return true;
1282 // Blacklist by location.
1283 if (Loc.isValid())
1284 return SanitizerBL.isBlacklistedLocation(Loc);
1285 // If location is unknown, this may be a compiler-generated function. Assume
1286 // it's located in the main file.
1287 auto &SM = Context.getSourceManager();
1288 if (const auto *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
1289 return SanitizerBL.isBlacklistedFile(MainFile->getName());
1290 }
1291 return false;
1292}
1293
1294bool CodeGenModule::isInSanitizerBlacklist(llvm::GlobalVariable *GV,
1295 SourceLocation Loc, QualType Ty,
1296 StringRef Category) const {
1297 // For now globals can be blacklisted only in ASan and KASan.
1298 if (!LangOpts.Sanitize.hasOneOf(
1299 SanitizerKind::Address | SanitizerKind::KernelAddress))
1300 return false;
1301 const auto &SanitizerBL = getContext().getSanitizerBlacklist();
1302 if (SanitizerBL.isBlacklistedGlobal(GV->getName(), Category))
1303 return true;
1304 if (SanitizerBL.isBlacklistedLocation(Loc, Category))
1305 return true;
1306 // Check global type.
1307 if (!Ty.isNull()) {
1308 // Drill down the array types: if global variable of a fixed type is
1309 // blacklisted, we also don't instrument arrays of them.
1310 while (auto AT = dyn_cast<ArrayType>(Ty.getTypePtr()))
1311 Ty = AT->getElementType();
1312 Ty = Ty.getCanonicalType().getUnqualifiedType();
1313 // We allow to blacklist only record types (classes, structs etc.)
1314 if (Ty->isRecordType()) {
1315 std::string TypeStr = Ty.getAsString(getContext().getPrintingPolicy());
1316 if (SanitizerBL.isBlacklistedType(TypeStr, Category))
1317 return true;
1318 }
1319 }
1320 return false;
1321}
1322
1323bool CodeGenModule::MustBeEmitted(const ValueDecl *Global) {
1324 // Never defer when EmitAllDecls is specified.
1325 if (LangOpts.EmitAllDecls)
1326 return true;
1327
1328 return getContext().DeclMustBeEmitted(Global);
1329}
1330
1331bool CodeGenModule::MayBeEmittedEagerly(const ValueDecl *Global) {
1332 if (const auto *FD = dyn_cast<FunctionDecl>(Global))
1333 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
1334 // Implicit template instantiations may change linkage if they are later
1335 // explicitly instantiated, so they should not be emitted eagerly.
1336 return false;
1337 // If OpenMP is enabled and threadprivates must be generated like TLS, delay
1338 // codegen for global variables, because they may be marked as threadprivate.
1339 if (LangOpts.OpenMP && LangOpts.OpenMPUseTLS &&
1340 getContext().getTargetInfo().isTLSSupported() && isa<VarDecl>(Global))
1341 return false;
1342
1343 return true;
1344}
1345
1346ConstantAddress CodeGenModule::GetAddrOfUuidDescriptor(
1347 const CXXUuidofExpr* E) {
1348 // Sema has verified that IIDSource has a __declspec(uuid()), and that its
1349 // well-formed.
1350 StringRef Uuid = E->getUuidAsStringRef(Context);
1351 std::string Name = "_GUID_" + Uuid.lower();
1352 std::replace(Name.begin(), Name.end(), '-', '_');
1353
1354 // Contains a 32-bit field.
1355 CharUnits Alignment = CharUnits::fromQuantity(4);
1356
1357 // Look for an existing global.
1358 if (llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name))
1359 return ConstantAddress(GV, Alignment);
1360
1361 llvm::Constant *Init = EmitUuidofInitializer(Uuid);
1362 assert(Init && "failed to initialize as constant")((Init && "failed to initialize as constant") ? static_cast
<void> (0) : __assert_fail ("Init && \"failed to initialize as constant\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1362, __PRETTY_FUNCTION__))
;
1363
1364 auto *GV = new llvm::GlobalVariable(
1365 getModule(), Init->getType(),
1366 /*isConstant=*/true, llvm::GlobalValue::LinkOnceODRLinkage, Init, Name);
1367 if (supportsCOMDAT())
1368 GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
1369 return ConstantAddress(GV, Alignment);
1370}
1371
1372ConstantAddress CodeGenModule::GetWeakRefReference(const ValueDecl *VD) {
1373 const AliasAttr *AA = VD->getAttr<AliasAttr>();
1374 assert(AA && "No alias?")((AA && "No alias?") ? static_cast<void> (0) : __assert_fail
("AA && \"No alias?\"", "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1374, __PRETTY_FUNCTION__))
;
1375
1376 CharUnits Alignment = getContext().getDeclAlign(VD);
1377 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(VD->getType());
1378
1379 // See if there is already something with the target's name in the module.
1380 llvm::GlobalValue *Entry = GetGlobalValue(AA->getAliasee());
1381 if (Entry) {
1382 unsigned AS = getContext().getTargetAddressSpace(VD->getType());
1383 auto Ptr = llvm::ConstantExpr::getBitCast(Entry, DeclTy->getPointerTo(AS));
1384 return ConstantAddress(Ptr, Alignment);
1385 }
1386
1387 llvm::Constant *Aliasee;
1388 if (isa<llvm::FunctionType>(DeclTy))
1389 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy,
1390 GlobalDecl(cast<FunctionDecl>(VD)),
1391 /*ForVTable=*/false);
1392 else
1393 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
1394 llvm::PointerType::getUnqual(DeclTy),
1395 nullptr);
1396
1397 auto *F = cast<llvm::GlobalValue>(Aliasee);
1398 F->setLinkage(llvm::Function::ExternalWeakLinkage);
1399 WeakRefReferences.insert(F);
1400
1401 return ConstantAddress(Aliasee, Alignment);
1402}
1403
1404void CodeGenModule::EmitGlobal(GlobalDecl GD) {
1405 const auto *Global = cast<ValueDecl>(GD.getDecl());
1406
1407 // Weak references don't produce any output by themselves.
1408 if (Global->hasAttr<WeakRefAttr>())
1409 return;
1410
1411 // If this is an alias definition (which otherwise looks like a declaration)
1412 // emit it now.
1413 if (Global->hasAttr<AliasAttr>())
1414 return EmitAliasDefinition(GD);
1415
1416 // If this is CUDA, be selective about which declarations we emit.
1417 if (LangOpts.CUDA) {
1418 if (LangOpts.CUDAIsDevice) {
1419 if (!Global->hasAttr<CUDADeviceAttr>() &&
1420 !Global->hasAttr<CUDAGlobalAttr>() &&
1421 !Global->hasAttr<CUDAConstantAttr>() &&
1422 !Global->hasAttr<CUDASharedAttr>())
1423 return;
1424 } else {
1425 if (!Global->hasAttr<CUDAHostAttr>() && (
1426 Global->hasAttr<CUDADeviceAttr>() ||
1427 Global->hasAttr<CUDAConstantAttr>() ||
1428 Global->hasAttr<CUDASharedAttr>()))
1429 return;
1430 }
1431 }
1432
1433 // Ignore declarations, they will be emitted on their first use.
1434 if (const auto *FD = dyn_cast<FunctionDecl>(Global)) {
1435 // Forward declarations are emitted lazily on first use.
1436 if (!FD->doesThisDeclarationHaveABody()) {
1437 if (!FD->doesDeclarationForceExternallyVisibleDefinition())
1438 return;
1439
1440 StringRef MangledName = getMangledName(GD);
1441
1442 // Compute the function info and LLVM type.
1443 const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
1444 llvm::Type *Ty = getTypes().GetFunctionType(FI);
1445
1446 GetOrCreateLLVMFunction(MangledName, Ty, GD, /*ForVTable=*/false,
1447 /*DontDefer=*/false);
1448 return;
1449 }
1450 } else {
1451 const auto *VD = cast<VarDecl>(Global);
1452 assert(VD->isFileVarDecl() && "Cannot emit local var decl as global.")((VD->isFileVarDecl() && "Cannot emit local var decl as global."
) ? static_cast<void> (0) : __assert_fail ("VD->isFileVarDecl() && \"Cannot emit local var decl as global.\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1452, __PRETTY_FUNCTION__))
;
1453
1454 if (VD->isThisDeclarationADefinition() != VarDecl::Definition &&
1455 !Context.isMSStaticDataMemberInlineDefinition(VD))
1456 return;
1457 }
1458
1459 // Defer code generation to first use when possible, e.g. if this is an inline
1460 // function. If the global must always be emitted, do it eagerly if possible
1461 // to benefit from cache locality.
1462 if (MustBeEmitted(Global) && MayBeEmittedEagerly(Global)) {
1463 // Emit the definition if it can't be deferred.
1464 EmitGlobalDefinition(GD);
1465 return;
1466 }
1467
1468 // If we're deferring emission of a C++ variable with an
1469 // initializer, remember the order in which it appeared in the file.
1470 if (getLangOpts().CPlusPlus && isa<VarDecl>(Global) &&
1471 cast<VarDecl>(Global)->hasInit()) {
1472 DelayedCXXInitPosition[Global] = CXXGlobalInits.size();
1473 CXXGlobalInits.push_back(nullptr);
1474 }
1475
1476 StringRef MangledName = getMangledName(GD);
1477 if (llvm::GlobalValue *GV = GetGlobalValue(MangledName)) {
1478 // The value has already been used and should therefore be emitted.
1479 addDeferredDeclToEmit(GV, GD);
1480 } else if (MustBeEmitted(Global)) {
1481 // The value must be emitted, but cannot be emitted eagerly.
1482 assert(!MayBeEmittedEagerly(Global))((!MayBeEmittedEagerly(Global)) ? static_cast<void> (0)
: __assert_fail ("!MayBeEmittedEagerly(Global)", "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1482, __PRETTY_FUNCTION__))
;
1483 addDeferredDeclToEmit(/*GV=*/nullptr, GD);
1484 } else {
1485 // Otherwise, remember that we saw a deferred decl with this name. The
1486 // first use of the mangled name will cause it to move into
1487 // DeferredDeclsToEmit.
1488 DeferredDecls[MangledName] = GD;
1489 }
1490}
1491
1492namespace {
1493 struct FunctionIsDirectlyRecursive :
1494 public RecursiveASTVisitor<FunctionIsDirectlyRecursive> {
1495 const StringRef Name;
1496 const Builtin::Context &BI;
1497 bool Result;
1498 FunctionIsDirectlyRecursive(StringRef N, const Builtin::Context &C) :
1499 Name(N), BI(C), Result(false) {
1500 }
1501 typedef RecursiveASTVisitor<FunctionIsDirectlyRecursive> Base;
1502
1503 bool TraverseCallExpr(CallExpr *E) {
1504 const FunctionDecl *FD = E->getDirectCallee();
1505 if (!FD)
1506 return true;
1507 AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
1508 if (Attr && Name == Attr->getLabel()) {
1509 Result = true;
1510 return false;
1511 }
1512 unsigned BuiltinID = FD->getBuiltinID();
1513 if (!BuiltinID || !BI.isLibFunction(BuiltinID))
1514 return true;
1515 StringRef BuiltinName = BI.getName(BuiltinID);
1516 if (BuiltinName.startswith("__builtin_") &&
1517 Name == BuiltinName.slice(strlen("__builtin_"), StringRef::npos)) {
1518 Result = true;
1519 return false;
1520 }
1521 return true;
1522 }
1523 };
1524
1525 struct DLLImportFunctionVisitor
1526 : public RecursiveASTVisitor<DLLImportFunctionVisitor> {
1527 bool SafeToInline = true;
1528
1529 bool VisitVarDecl(VarDecl *VD) {
1530 // A thread-local variable cannot be imported.
1531 SafeToInline = !VD->getTLSKind();
1532 return SafeToInline;
1533 }
1534
1535 // Make sure we're not referencing non-imported vars or functions.
1536 bool VisitDeclRefExpr(DeclRefExpr *E) {
1537 ValueDecl *VD = E->getDecl();
1538 if (isa<FunctionDecl>(VD))
1539 SafeToInline = VD->hasAttr<DLLImportAttr>();
1540 else if (VarDecl *V = dyn_cast<VarDecl>(VD))
1541 SafeToInline = !V->hasGlobalStorage() || V->hasAttr<DLLImportAttr>();
1542 return SafeToInline;
1543 }
1544 bool VisitCXXDeleteExpr(CXXDeleteExpr *E) {
1545 SafeToInline = E->getOperatorDelete()->hasAttr<DLLImportAttr>();
1546 return SafeToInline;
1547 }
1548 bool VisitCXXNewExpr(CXXNewExpr *E) {
1549 SafeToInline = E->getOperatorNew()->hasAttr<DLLImportAttr>();
1550 return SafeToInline;
1551 }
1552 };
1553}
1554
1555// isTriviallyRecursive - Check if this function calls another
1556// decl that, because of the asm attribute or the other decl being a builtin,
1557// ends up pointing to itself.
1558bool
1559CodeGenModule::isTriviallyRecursive(const FunctionDecl *FD) {
1560 StringRef Name;
1561 if (getCXXABI().getMangleContext().shouldMangleDeclName(FD)) {
1562 // asm labels are a special kind of mangling we have to support.
1563 AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
1564 if (!Attr)
1565 return false;
1566 Name = Attr->getLabel();
1567 } else {
1568 Name = FD->getName();
1569 }
1570
1571 FunctionIsDirectlyRecursive Walker(Name, Context.BuiltinInfo);
1572 Walker.TraverseFunctionDecl(const_cast<FunctionDecl*>(FD));
1573 return Walker.Result;
1574}
1575
1576bool
1577CodeGenModule::shouldEmitFunction(GlobalDecl GD) {
1578 if (getFunctionLinkage(GD) != llvm::Function::AvailableExternallyLinkage)
1579 return true;
1580 const auto *F = cast<FunctionDecl>(GD.getDecl());
1581 if (CodeGenOpts.OptimizationLevel == 0 && !F->hasAttr<AlwaysInlineAttr>())
1582 return false;
1583
1584 if (F->hasAttr<DLLImportAttr>()) {
1585 // Check whether it would be safe to inline this dllimport function.
1586 DLLImportFunctionVisitor Visitor;
1587 Visitor.TraverseFunctionDecl(const_cast<FunctionDecl*>(F));
1588 if (!Visitor.SafeToInline)
1589 return false;
1590 }
1591
1592 // PR9614. Avoid cases where the source code is lying to us. An available
1593 // externally function should have an equivalent function somewhere else,
1594 // but a function that calls itself is clearly not equivalent to the real
1595 // implementation.
1596 // This happens in glibc's btowc and in some configure checks.
1597 return !isTriviallyRecursive(F);
1598}
1599
1600/// If the type for the method's class was generated by
1601/// CGDebugInfo::createContextChain(), the cache contains only a
1602/// limited DIType without any declarations. Since EmitFunctionStart()
1603/// needs to find the canonical declaration for each method, we need
1604/// to construct the complete type prior to emitting the method.
1605void CodeGenModule::CompleteDIClassType(const CXXMethodDecl* D) {
1606 if (!D->isInstance())
1607 return;
1608
1609 if (CGDebugInfo *DI = getModuleDebugInfo())
1610 if (getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo) {
1611 const auto *ThisPtr = cast<PointerType>(D->getThisType(getContext()));
1612 DI->getOrCreateRecordType(ThisPtr->getPointeeType(), D->getLocation());
1613 }
1614}
1615
1616void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD, llvm::GlobalValue *GV) {
1617 const auto *D = cast<ValueDecl>(GD.getDecl());
1618
1619 PrettyStackTraceDecl CrashInfo(const_cast<ValueDecl *>(D), D->getLocation(),
1620 Context.getSourceManager(),
1621 "Generating code for declaration");
1622
1623 if (isa<FunctionDecl>(D)) {
1624 // At -O0, don't generate IR for functions with available_externally
1625 // linkage.
1626 if (!shouldEmitFunction(GD))
1627 return;
1628
1629 if (const auto *Method = dyn_cast<CXXMethodDecl>(D)) {
1630 CompleteDIClassType(Method);
1631 // Make sure to emit the definition(s) before we emit the thunks.
1632 // This is necessary for the generation of certain thunks.
1633 if (const auto *CD = dyn_cast<CXXConstructorDecl>(Method))
1634 ABI->emitCXXStructor(CD, getFromCtorType(GD.getCtorType()));
1635 else if (const auto *DD = dyn_cast<CXXDestructorDecl>(Method))
1636 ABI->emitCXXStructor(DD, getFromDtorType(GD.getDtorType()));
1637 else
1638 EmitGlobalFunctionDefinition(GD, GV);
1639
1640 if (Method->isVirtual())
1641 getVTables().EmitThunks(GD);
1642
1643 return;
1644 }
1645
1646 return EmitGlobalFunctionDefinition(GD, GV);
1647 }
1648
1649 if (const auto *VD = dyn_cast<VarDecl>(D))
1650 return EmitGlobalVarDefinition(VD);
1651
1652 llvm_unreachable("Invalid argument to EmitGlobalDefinition()")::llvm::llvm_unreachable_internal("Invalid argument to EmitGlobalDefinition()"
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1652)
;
1653}
1654
1655static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old,
1656 llvm::Function *NewFn);
1657
1658/// GetOrCreateLLVMFunction - If the specified mangled name is not in the
1659/// module, create and return an llvm Function with the specified type. If there
1660/// is something in the module with the specified name, return it potentially
1661/// bitcasted to the right type.
1662///
1663/// If D is non-null, it specifies a decl that correspond to this. This is used
1664/// to set the attributes on the function when it is first created.
1665llvm::Constant *
1666CodeGenModule::GetOrCreateLLVMFunction(StringRef MangledName,
1667 llvm::Type *Ty,
1668 GlobalDecl GD, bool ForVTable,
1669 bool DontDefer, bool IsThunk,
1670 llvm::AttributeSet ExtraAttrs,
1671 bool IsForDefinition) {
1672 const Decl *D = GD.getDecl();
1673
1674 // Lookup the entry, lazily creating it if necessary.
1675 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
1676 if (Entry) {
1677 if (WeakRefReferences.erase(Entry)) {
1678 const FunctionDecl *FD = cast_or_null<FunctionDecl>(D);
1679 if (FD && !FD->hasAttr<WeakAttr>())
1680 Entry->setLinkage(llvm::Function::ExternalLinkage);
1681 }
1682
1683 // Handle dropped DLL attributes.
1684 if (D && !D->hasAttr<DLLImportAttr>() && !D->hasAttr<DLLExportAttr>())
1685 Entry->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
1686
1687 // If there are two attempts to define the same mangled name, issue an
1688 // error.
1689 if (IsForDefinition && !Entry->isDeclaration()) {
1690 GlobalDecl OtherGD;
1691 // Check that GD is not yet in DiagnosedConflictingDefinitions is required
1692 // to make sure that we issue an error only once.
1693 if (lookupRepresentativeDecl(MangledName, OtherGD) &&
1694 (GD.getCanonicalDecl().getDecl() !=
1695 OtherGD.getCanonicalDecl().getDecl()) &&
1696 DiagnosedConflictingDefinitions.insert(GD).second) {
1697 getDiags().Report(D->getLocation(),
1698 diag::err_duplicate_mangled_name);
1699 getDiags().Report(OtherGD.getDecl()->getLocation(),
1700 diag::note_previous_definition);
1701 }
1702 }
1703
1704 if ((isa<llvm::Function>(Entry) || isa<llvm::GlobalAlias>(Entry)) &&
1705 (Entry->getType()->getElementType() == Ty)) {
1706 return Entry;
1707 }
1708
1709 // Make sure the result is of the correct type.
1710 // (If function is requested for a definition, we always need to create a new
1711 // function, not just return a bitcast.)
1712 if (!IsForDefinition)
1713 return llvm::ConstantExpr::getBitCast(Entry, Ty->getPointerTo());
1714 }
1715
1716 // This function doesn't have a complete type (for example, the return
1717 // type is an incomplete struct). Use a fake type instead, and make
1718 // sure not to try to set attributes.
1719 bool IsIncompleteFunction = false;
1720
1721 llvm::FunctionType *FTy;
1722 if (isa<llvm::FunctionType>(Ty)) {
1723 FTy = cast<llvm::FunctionType>(Ty);
1724 } else {
1725 FTy = llvm::FunctionType::get(VoidTy, false);
1726 IsIncompleteFunction = true;
1727 }
1728
1729 llvm::Function *F =
1730 llvm::Function::Create(FTy, llvm::Function::ExternalLinkage,
1731 Entry ? StringRef() : MangledName, &getModule());
1732
1733 // If we already created a function with the same mangled name (but different
1734 // type) before, take its name and add it to the list of functions to be
1735 // replaced with F at the end of CodeGen.
1736 //
1737 // This happens if there is a prototype for a function (e.g. "int f()") and
1738 // then a definition of a different type (e.g. "int f(int x)").
1739 if (Entry) {
1740 F->takeName(Entry);
1741
1742 // This might be an implementation of a function without a prototype, in
1743 // which case, try to do special replacement of calls which match the new
1744 // prototype. The really key thing here is that we also potentially drop
1745 // arguments from the call site so as to make a direct call, which makes the
1746 // inliner happier and suppresses a number of optimizer warnings (!) about
1747 // dropping arguments.
1748 if (!Entry->use_empty()) {
1749 ReplaceUsesOfNonProtoTypeWithRealFunction(Entry, F);
1750 Entry->removeDeadConstantUsers();
1751 }
1752
1753 llvm::Constant *BC = llvm::ConstantExpr::getBitCast(
1754 F, Entry->getType()->getElementType()->getPointerTo());
1755 addGlobalValReplacement(Entry, BC);
1756 }
1757
1758 assert(F->getName() == MangledName && "name was uniqued!")((F->getName() == MangledName && "name was uniqued!"
) ? static_cast<void> (0) : __assert_fail ("F->getName() == MangledName && \"name was uniqued!\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1758, __PRETTY_FUNCTION__))
;
1759 if (D)
1760 SetFunctionAttributes(GD, F, IsIncompleteFunction, IsThunk);
1761 if (ExtraAttrs.hasAttributes(llvm::AttributeSet::FunctionIndex)) {
1762 llvm::AttrBuilder B(ExtraAttrs, llvm::AttributeSet::FunctionIndex);
1763 F->addAttributes(llvm::AttributeSet::FunctionIndex,
1764 llvm::AttributeSet::get(VMContext,
1765 llvm::AttributeSet::FunctionIndex,
1766 B));
1767 }
1768
1769 if (!DontDefer) {
1770 // All MSVC dtors other than the base dtor are linkonce_odr and delegate to
1771 // each other bottoming out with the base dtor. Therefore we emit non-base
1772 // dtors on usage, even if there is no dtor definition in the TU.
1773 if (D && isa<CXXDestructorDecl>(D) &&
1774 getCXXABI().useThunkForDtorVariant(cast<CXXDestructorDecl>(D),
1775 GD.getDtorType()))
1776 addDeferredDeclToEmit(F, GD);
1777
1778 // This is the first use or definition of a mangled name. If there is a
1779 // deferred decl with this name, remember that we need to emit it at the end
1780 // of the file.
1781 auto DDI = DeferredDecls.find(MangledName);
1782 if (DDI != DeferredDecls.end()) {
1783 // Move the potentially referenced deferred decl to the
1784 // DeferredDeclsToEmit list, and remove it from DeferredDecls (since we
1785 // don't need it anymore).
1786 addDeferredDeclToEmit(F, DDI->second);
1787 DeferredDecls.erase(DDI);
1788
1789 // Otherwise, there are cases we have to worry about where we're
1790 // using a declaration for which we must emit a definition but where
1791 // we might not find a top-level definition:
1792 // - member functions defined inline in their classes
1793 // - friend functions defined inline in some class
1794 // - special member functions with implicit definitions
1795 // If we ever change our AST traversal to walk into class methods,
1796 // this will be unnecessary.
1797 //
1798 // We also don't emit a definition for a function if it's going to be an
1799 // entry in a vtable, unless it's already marked as used.
1800 } else if (getLangOpts().CPlusPlus && D) {
1801 // Look for a declaration that's lexically in a record.
1802 for (const auto *FD = cast<FunctionDecl>(D)->getMostRecentDecl(); FD;
1803 FD = FD->getPreviousDecl()) {
1804 if (isa<CXXRecordDecl>(FD->getLexicalDeclContext())) {
1805 if (FD->doesThisDeclarationHaveABody()) {
1806 addDeferredDeclToEmit(F, GD.getWithDecl(FD));
1807 break;
1808 }
1809 }
1810 }
1811 }
1812 }
1813
1814 // Make sure the result is of the requested type.
1815 if (!IsIncompleteFunction) {
1816 assert(F->getType()->getElementType() == Ty)((F->getType()->getElementType() == Ty) ? static_cast<
void> (0) : __assert_fail ("F->getType()->getElementType() == Ty"
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1816, __PRETTY_FUNCTION__))
;
1817 return F;
1818 }
1819
1820 llvm::Type *PTy = llvm::PointerType::getUnqual(Ty);
1821 return llvm::ConstantExpr::getBitCast(F, PTy);
1822}
1823
1824/// GetAddrOfFunction - Return the address of the given function. If Ty is
1825/// non-null, then this function will use the specified type if it has to
1826/// create it (this occurs when we see a definition of the function).
1827llvm::Constant *CodeGenModule::GetAddrOfFunction(GlobalDecl GD,
1828 llvm::Type *Ty,
1829 bool ForVTable,
1830 bool DontDefer,
1831 bool IsForDefinition) {
1832 // If there was no specific requested type, just convert it now.
1833 if (!Ty) {
1834 const auto *FD = cast<FunctionDecl>(GD.getDecl());
1835 auto CanonTy = Context.getCanonicalType(FD->getType());
1836 Ty = getTypes().ConvertFunctionType(CanonTy, FD);
1837 }
1838
1839 StringRef MangledName = getMangledName(GD);
1840 return GetOrCreateLLVMFunction(MangledName, Ty, GD, ForVTable, DontDefer,
1841 /*IsThunk=*/false, llvm::AttributeSet(),
1842 IsForDefinition);
1843}
1844
1845/// CreateRuntimeFunction - Create a new runtime function with the specified
1846/// type and name.
1847llvm::Constant *
1848CodeGenModule::CreateRuntimeFunction(llvm::FunctionType *FTy,
1849 StringRef Name,
1850 llvm::AttributeSet ExtraAttrs) {
1851 llvm::Constant *C =
1852 GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(), /*ForVTable=*/false,
1853 /*DontDefer=*/false, /*IsThunk=*/false, ExtraAttrs);
1854 if (auto *F = dyn_cast<llvm::Function>(C))
1855 if (F->empty())
1856 F->setCallingConv(getRuntimeCC());
1857 return C;
1858}
1859
1860/// CreateBuiltinFunction - Create a new builtin function with the specified
1861/// type and name.
1862llvm::Constant *
1863CodeGenModule::CreateBuiltinFunction(llvm::FunctionType *FTy,
1864 StringRef Name,
1865 llvm::AttributeSet ExtraAttrs) {
1866 llvm::Constant *C =
1867 GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(), /*ForVTable=*/false,
1868 /*DontDefer=*/false, /*IsThunk=*/false, ExtraAttrs);
1869 if (auto *F = dyn_cast<llvm::Function>(C))
1870 if (F->empty())
1871 F->setCallingConv(getBuiltinCC());
1872 return C;
1873}
1874
1875/// isTypeConstant - Determine whether an object of this type can be emitted
1876/// as a constant.
1877///
1878/// If ExcludeCtor is true, the duration when the object's constructor runs
1879/// will not be considered. The caller will need to verify that the object is
1880/// not written to during its construction.
1881bool CodeGenModule::isTypeConstant(QualType Ty, bool ExcludeCtor) {
1882 if (!Ty.isConstant(Context) && !Ty->isReferenceType())
1883 return false;
1884
1885 if (Context.getLangOpts().CPlusPlus) {
1886 if (const CXXRecordDecl *Record
1887 = Context.getBaseElementType(Ty)->getAsCXXRecordDecl())
1888 return ExcludeCtor && !Record->hasMutableFields() &&
1889 Record->hasTrivialDestructor();
1890 }
1891
1892 return true;
1893}
1894
1895/// GetOrCreateLLVMGlobal - If the specified mangled name is not in the module,
1896/// create and return an llvm GlobalVariable with the specified type. If there
1897/// is something in the module with the specified name, return it potentially
1898/// bitcasted to the right type.
1899///
1900/// If D is non-null, it specifies a decl that correspond to this. This is used
1901/// to set the attributes on the global when it is first created.
1902llvm::Constant *
1903CodeGenModule::GetOrCreateLLVMGlobal(StringRef MangledName,
1904 llvm::PointerType *Ty,
1905 const VarDecl *D,
1906 bool IsForDefinition) {
1907 // Lookup the entry, lazily creating it if necessary.
1908 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
1909 if (Entry) {
1910 if (WeakRefReferences.erase(Entry)) {
1911 if (D && !D->hasAttr<WeakAttr>())
1912 Entry->setLinkage(llvm::Function::ExternalLinkage);
1913 }
1914
1915 // Handle dropped DLL attributes.
1916 if (D && !D->hasAttr<DLLImportAttr>() && !D->hasAttr<DLLExportAttr>())
1917 Entry->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
1918
1919 if (Entry->getType() == Ty)
1920 return Entry;
1921
1922 // If there are two attempts to define the same mangled name, issue an
1923 // error.
1924 if (IsForDefinition && !Entry->isDeclaration()) {
1925 GlobalDecl OtherGD;
1926 // Check that D is not yet in DiagnosedConflictingDefinitions is required
1927 // to make sure that we issue an error only once.
1928 if (lookupRepresentativeDecl(MangledName, OtherGD) &&
1929 (D->getCanonicalDecl() != OtherGD.getCanonicalDecl().getDecl()) &&
1930 DiagnosedConflictingDefinitions.insert(D).second) {
1931 getDiags().Report(D->getLocation(),
1932 diag::err_duplicate_mangled_name);
1933 getDiags().Report(OtherGD.getDecl()->getLocation(),
1934 diag::note_previous_definition);
1935 }
1936 }
1937
1938 // Make sure the result is of the correct type.
1939 if (Entry->getType()->getAddressSpace() != Ty->getAddressSpace())
1940 return llvm::ConstantExpr::getAddrSpaceCast(Entry, Ty);
1941
1942 // Make sure the result is of the correct type.
1943 // (If global is requested for a definition, we always need to create a new
1944 // global, not just return a bitcast.)
1945 if (!IsForDefinition)
1946 return llvm::ConstantExpr::getBitCast(Entry, Ty);
1947 }
1948
1949 unsigned AddrSpace = GetGlobalVarAddressSpace(D, Ty->getAddressSpace());
1950 auto *GV = new llvm::GlobalVariable(
1951 getModule(), Ty->getElementType(), false,
1952 llvm::GlobalValue::ExternalLinkage, nullptr, MangledName, nullptr,
1953 llvm::GlobalVariable::NotThreadLocal, AddrSpace);
1954
1955 // If we already created a global with the same mangled name (but different
1956 // type) before, take its name and remove it from its parent.
1957 if (Entry) {
1958 GV->takeName(Entry);
1959
1960 if (!Entry->use_empty()) {
1961 llvm::Constant *NewPtrForOldDecl =
1962 llvm::ConstantExpr::getBitCast(GV, Entry->getType());
1963 Entry->replaceAllUsesWith(NewPtrForOldDecl);
1964 }
1965
1966 Entry->eraseFromParent();
1967 }
1968
1969 // This is the first use or definition of a mangled name. If there is a
1970 // deferred decl with this name, remember that we need to emit it at the end
1971 // of the file.
1972 auto DDI = DeferredDecls.find(MangledName);
1973 if (DDI != DeferredDecls.end()) {
1974 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit
1975 // list, and remove it from DeferredDecls (since we don't need it anymore).
1976 addDeferredDeclToEmit(GV, DDI->second);
1977 DeferredDecls.erase(DDI);
1978 }
1979
1980 // Handle things which are present even on external declarations.
1981 if (D) {
1982 // FIXME: This code is overly simple and should be merged with other global
1983 // handling.
1984 GV->setConstant(isTypeConstant(D->getType(), false));
1985
1986 GV->setAlignment(getContext().getDeclAlign(D).getQuantity());
1987
1988 setLinkageAndVisibilityForGV(GV, D);
1989
1990 if (D->getTLSKind()) {
1991 if (D->getTLSKind() == VarDecl::TLS_Dynamic)
1992 CXXThreadLocals.push_back(D);
1993 setTLSMode(GV, *D);
1994 }
1995
1996 // If required by the ABI, treat declarations of static data members with
1997 // inline initializers as definitions.
1998 if (getContext().isMSStaticDataMemberInlineDefinition(D)) {
1999 EmitGlobalVarDefinition(D);
2000 }
2001
2002 // Handle XCore specific ABI requirements.
2003 if (getTarget().getTriple().getArch() == llvm::Triple::xcore &&
2004 D->getLanguageLinkage() == CLanguageLinkage &&
2005 D->getType().isConstant(Context) &&
2006 isExternallyVisible(D->getLinkageAndVisibility().getLinkage()))
2007 GV->setSection(".cp.rodata");
2008 }
2009
2010 if (AddrSpace != Ty->getAddressSpace())
2011 return llvm::ConstantExpr::getAddrSpaceCast(GV, Ty);
2012
2013 return GV;
2014}
2015
2016llvm::Constant *
2017CodeGenModule::GetAddrOfGlobal(GlobalDecl GD,
2018 bool IsForDefinition) {
2019 if (isa<CXXConstructorDecl>(GD.getDecl()))
2020 return getAddrOfCXXStructor(cast<CXXConstructorDecl>(GD.getDecl()),
2021 getFromCtorType(GD.getCtorType()),
2022 /*FnInfo=*/nullptr, /*FnType=*/nullptr,
2023 /*DontDefer=*/false, IsForDefinition);
2024 else if (isa<CXXDestructorDecl>(GD.getDecl()))
2025 return getAddrOfCXXStructor(cast<CXXDestructorDecl>(GD.getDecl()),
2026 getFromDtorType(GD.getDtorType()),
2027 /*FnInfo=*/nullptr, /*FnType=*/nullptr,
2028 /*DontDefer=*/false, IsForDefinition);
2029 else if (isa<CXXMethodDecl>(GD.getDecl())) {
2030 auto FInfo = &getTypes().arrangeCXXMethodDeclaration(
2031 cast<CXXMethodDecl>(GD.getDecl()));
2032 auto Ty = getTypes().GetFunctionType(*FInfo);
2033 return GetAddrOfFunction(GD, Ty, /*ForVTable=*/false, /*DontDefer=*/false,
2034 IsForDefinition);
2035 } else if (isa<FunctionDecl>(GD.getDecl())) {
2036 const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
2037 llvm::FunctionType *Ty = getTypes().GetFunctionType(FI);
2038 return GetAddrOfFunction(GD, Ty, /*ForVTable=*/false, /*DontDefer=*/false,
2039 IsForDefinition);
2040 } else
2041 return GetAddrOfGlobalVar(cast<VarDecl>(GD.getDecl()), /*Ty=*/nullptr,
2042 IsForDefinition);
2043}
2044
2045llvm::GlobalVariable *
2046CodeGenModule::CreateOrReplaceCXXRuntimeVariable(StringRef Name,
2047 llvm::Type *Ty,
2048 llvm::GlobalValue::LinkageTypes Linkage) {
2049 llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name);
2050 llvm::GlobalVariable *OldGV = nullptr;
2051
2052 if (GV) {
2053 // Check if the variable has the right type.
2054 if (GV->getType()->getElementType() == Ty)
2055 return GV;
2056
2057 // Because C++ name mangling, the only way we can end up with an already
2058 // existing global with the same name is if it has been declared extern "C".
2059 assert(GV->isDeclaration() && "Declaration has wrong type!")((GV->isDeclaration() && "Declaration has wrong type!"
) ? static_cast<void> (0) : __assert_fail ("GV->isDeclaration() && \"Declaration has wrong type!\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2059, __PRETTY_FUNCTION__))
;
2060 OldGV = GV;
2061 }
2062
2063 // Create a new variable.
2064 GV = new llvm::GlobalVariable(getModule(), Ty, /*isConstant=*/true,
2065 Linkage, nullptr, Name);
2066
2067 if (OldGV) {
2068 // Replace occurrences of the old variable if needed.
2069 GV->takeName(OldGV);
2070
2071 if (!OldGV->use_empty()) {
2072 llvm::Constant *NewPtrForOldDecl =
2073 llvm::ConstantExpr::getBitCast(GV, OldGV->getType());
2074 OldGV->replaceAllUsesWith(NewPtrForOldDecl);
2075 }
2076
2077 OldGV->eraseFromParent();
2078 }
2079
2080 if (supportsCOMDAT() && GV->isWeakForLinker() &&
2081 !GV->hasAvailableExternallyLinkage())
2082 GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
2083
2084 return GV;
2085}
2086
2087/// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the
2088/// given global variable. If Ty is non-null and if the global doesn't exist,
2089/// then it will be created with the specified type instead of whatever the
2090/// normal requested type would be.
2091llvm::Constant *CodeGenModule::GetAddrOfGlobalVar(const VarDecl *D,
2092 llvm::Type *Ty,
2093 bool IsForDefinition) {
2094 assert(D->hasGlobalStorage() && "Not a global variable")((D->hasGlobalStorage() && "Not a global variable"
) ? static_cast<void> (0) : __assert_fail ("D->hasGlobalStorage() && \"Not a global variable\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2094, __PRETTY_FUNCTION__))
;
2095 QualType ASTTy = D->getType();
2096 if (!Ty)
2097 Ty = getTypes().ConvertTypeForMem(ASTTy);
2098
2099 llvm::PointerType *PTy =
2100 llvm::PointerType::get(Ty, getContext().getTargetAddressSpace(ASTTy));
2101
2102 StringRef MangledName = getMangledName(D);
2103 return GetOrCreateLLVMGlobal(MangledName, PTy, D, IsForDefinition);
2104}
2105
2106/// CreateRuntimeVariable - Create a new runtime global variable with the
2107/// specified type and name.
2108llvm::Constant *
2109CodeGenModule::CreateRuntimeVariable(llvm::Type *Ty,
2110 StringRef Name) {
2111 return GetOrCreateLLVMGlobal(Name, llvm::PointerType::getUnqual(Ty), nullptr);
2112}
2113
2114void CodeGenModule::EmitTentativeDefinition(const VarDecl *D) {
2115 assert(!D->getInit() && "Cannot emit definite definitions here!")((!D->getInit() && "Cannot emit definite definitions here!"
) ? static_cast<void> (0) : __assert_fail ("!D->getInit() && \"Cannot emit definite definitions here!\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2115, __PRETTY_FUNCTION__))
;
2116
2117 if (!MustBeEmitted(D)) {
2118 // If we have not seen a reference to this variable yet, place it
2119 // into the deferred declarations table to be emitted if needed
2120 // later.
2121 StringRef MangledName = getMangledName(D);
2122 if (!GetGlobalValue(MangledName)) {
2123 DeferredDecls[MangledName] = D;
2124 return;
2125 }
2126 }
2127
2128 // The tentative definition is the only definition.
2129 EmitGlobalVarDefinition(D, true);
2130}
2131
2132CharUnits CodeGenModule::GetTargetTypeStoreSize(llvm::Type *Ty) const {
2133 return Context.toCharUnitsFromBits(
2134 getDataLayout().getTypeStoreSizeInBits(Ty));
2135}
2136
2137unsigned CodeGenModule::GetGlobalVarAddressSpace(const VarDecl *D,
2138 unsigned AddrSpace) {
2139 if (LangOpts.CUDA && LangOpts.CUDAIsDevice) {
2140 if (D->hasAttr<CUDAConstantAttr>())
2141 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_constant);
2142 else if (D->hasAttr<CUDASharedAttr>())
2143 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_shared);
2144 else
2145 AddrSpace = getContext().getTargetAddressSpace(LangAS::cuda_device);
2146 }
2147
2148 return AddrSpace;
2149}
2150
2151template<typename SomeDecl>
2152void CodeGenModule::MaybeHandleStaticInExternC(const SomeDecl *D,
2153 llvm::GlobalValue *GV) {
2154 if (!getLangOpts().CPlusPlus)
2155 return;
2156
2157 // Must have 'used' attribute, or else inline assembly can't rely on
2158 // the name existing.
2159 if (!D->template hasAttr<UsedAttr>())
2160 return;
2161
2162 // Must have internal linkage and an ordinary name.
2163 if (!D->getIdentifier() || D->getFormalLinkage() != InternalLinkage)
2164 return;
2165
2166 // Must be in an extern "C" context. Entities declared directly within
2167 // a record are not extern "C" even if the record is in such a context.
2168 const SomeDecl *First = D->getFirstDecl();
2169 if (First->getDeclContext()->isRecord() || !First->isInExternCContext())
2170 return;
2171
2172 // OK, this is an internal linkage entity inside an extern "C" linkage
2173 // specification. Make a note of that so we can give it the "expected"
2174 // mangled name if nothing else is using that name.
2175 std::pair<StaticExternCMap::iterator, bool> R =
2176 StaticExternCValues.insert(std::make_pair(D->getIdentifier(), GV));
2177
2178 // If we have multiple internal linkage entities with the same name
2179 // in extern "C" regions, none of them gets that name.
2180 if (!R.second)
2181 R.first->second = nullptr;
2182}
2183
2184static bool shouldBeInCOMDAT(CodeGenModule &CGM, const Decl &D) {
2185 if (!CGM.supportsCOMDAT())
2186 return false;
2187
2188 if (D.hasAttr<SelectAnyAttr>())
2189 return true;
2190
2191 GVALinkage Linkage;
2192 if (auto *VD = dyn_cast<VarDecl>(&D))
2193 Linkage = CGM.getContext().GetGVALinkageForVariable(VD);
2194 else
2195 Linkage = CGM.getContext().GetGVALinkageForFunction(cast<FunctionDecl>(&D));
2196
2197 switch (Linkage) {
2198 case GVA_Internal:
2199 case GVA_AvailableExternally:
2200 case GVA_StrongExternal:
2201 return false;
2202 case GVA_DiscardableODR:
2203 case GVA_StrongODR:
2204 return true;
2205 }
2206 llvm_unreachable("No such linkage")::llvm::llvm_unreachable_internal("No such linkage", "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2206)
;
2207}
2208
2209void CodeGenModule::maybeSetTrivialComdat(const Decl &D,
2210 llvm::GlobalObject &GO) {
2211 if (!shouldBeInCOMDAT(*this, D))
2212 return;
2213 GO.setComdat(TheModule.getOrInsertComdat(GO.getName()));
2214}
2215
2216void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D,
2217 bool IsTentative) {
2218 llvm::Constant *Init = nullptr;
2219 QualType ASTTy = D->getType();
2220 CXXRecordDecl *RD = ASTTy->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
2221 bool NeedsGlobalCtor = false;
2222 bool NeedsGlobalDtor = RD && !RD->hasTrivialDestructor();
2223
2224 const VarDecl *InitDecl;
2225 const Expr *InitExpr = D->getAnyInitializer(InitDecl);
2226
2227 // CUDA E.2.4.1 "__shared__ variables cannot have an initialization as part
2228 // of their declaration."
2229 if (getLangOpts().CPlusPlus && getLangOpts().CUDAIsDevice
2230 && D->hasAttr<CUDASharedAttr>()) {
2231 if (InitExpr) {
2232 const auto *C = dyn_cast<CXXConstructExpr>(InitExpr);
2233 if (C == nullptr || !C->getConstructor()->hasTrivialBody())
2234 Error(D->getLocation(),
2235 "__shared__ variable cannot have an initialization.");
2236 }
2237 Init = llvm::UndefValue::get(getTypes().ConvertType(ASTTy));
2238 } else if (!InitExpr) {
2239 // This is a tentative definition; tentative definitions are
2240 // implicitly initialized with { 0 }.
2241 //
2242 // Note that tentative definitions are only emitted at the end of
2243 // a translation unit, so they should never have incomplete
2244 // type. In addition, EmitTentativeDefinition makes sure that we
2245 // never attempt to emit a tentative definition if a real one
2246 // exists. A use may still exists, however, so we still may need
2247 // to do a RAUW.
2248 assert(!ASTTy->isIncompleteType() && "Unexpected incomplete type")((!ASTTy->isIncompleteType() && "Unexpected incomplete type"
) ? static_cast<void> (0) : __assert_fail ("!ASTTy->isIncompleteType() && \"Unexpected incomplete type\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2248, __PRETTY_FUNCTION__))
;
2249 Init = EmitNullConstant(D->getType());
2250 } else {
2251 initializedGlobalDecl = GlobalDecl(D);
2252 Init = EmitConstantInit(*InitDecl);
2253
2254 if (!Init) {
2255 QualType T = InitExpr->getType();
2256 if (D->getType()->isReferenceType())
2257 T = D->getType();
2258
2259 if (getLangOpts().CPlusPlus) {
2260 Init = EmitNullConstant(T);
2261 NeedsGlobalCtor = true;
2262 } else {
2263 ErrorUnsupported(D, "static initializer");
2264 Init = llvm::UndefValue::get(getTypes().ConvertType(T));
2265 }
2266 } else {
2267 // We don't need an initializer, so remove the entry for the delayed
2268 // initializer position (just in case this entry was delayed) if we
2269 // also don't need to register a destructor.
2270 if (getLangOpts().CPlusPlus && !NeedsGlobalDtor)
2271 DelayedCXXInitPosition.erase(D);
2272 }
2273 }
2274
2275 llvm::Type* InitType = Init->getType();
2276 llvm::Constant *Entry =
2277 GetAddrOfGlobalVar(D, InitType, /*IsForDefinition=*/!IsTentative);
2278
2279 // Strip off a bitcast if we got one back.
2280 if (auto *CE = dyn_cast<llvm::ConstantExpr>(Entry)) {
2281 assert(CE->getOpcode() == llvm::Instruction::BitCast ||((CE->getOpcode() == llvm::Instruction::BitCast || CE->
getOpcode() == llvm::Instruction::AddrSpaceCast || CE->getOpcode
() == llvm::Instruction::GetElementPtr) ? static_cast<void
> (0) : __assert_fail ("CE->getOpcode() == llvm::Instruction::BitCast || CE->getOpcode() == llvm::Instruction::AddrSpaceCast || CE->getOpcode() == llvm::Instruction::GetElementPtr"
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2284, __PRETTY_FUNCTION__))
2282 CE->getOpcode() == llvm::Instruction::AddrSpaceCast ||((CE->getOpcode() == llvm::Instruction::BitCast || CE->
getOpcode() == llvm::Instruction::AddrSpaceCast || CE->getOpcode
() == llvm::Instruction::GetElementPtr) ? static_cast<void
> (0) : __assert_fail ("CE->getOpcode() == llvm::Instruction::BitCast || CE->getOpcode() == llvm::Instruction::AddrSpaceCast || CE->getOpcode() == llvm::Instruction::GetElementPtr"
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2284, __PRETTY_FUNCTION__))
2283 // All zero index gep.((CE->getOpcode() == llvm::Instruction::BitCast || CE->
getOpcode() == llvm::Instruction::AddrSpaceCast || CE->getOpcode
() == llvm::Instruction::GetElementPtr) ? static_cast<void
> (0) : __assert_fail ("CE->getOpcode() == llvm::Instruction::BitCast || CE->getOpcode() == llvm::Instruction::AddrSpaceCast || CE->getOpcode() == llvm::Instruction::GetElementPtr"
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2284, __PRETTY_FUNCTION__))
2284 CE->getOpcode() == llvm::Instruction::GetElementPtr)((CE->getOpcode() == llvm::Instruction::BitCast || CE->
getOpcode() == llvm::Instruction::AddrSpaceCast || CE->getOpcode
() == llvm::Instruction::GetElementPtr) ? static_cast<void
> (0) : __assert_fail ("CE->getOpcode() == llvm::Instruction::BitCast || CE->getOpcode() == llvm::Instruction::AddrSpaceCast || CE->getOpcode() == llvm::Instruction::GetElementPtr"
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2284, __PRETTY_FUNCTION__))
;
2285 Entry = CE->getOperand(0);
2286 }
2287
2288 // Entry is now either a Function or GlobalVariable.
2289 auto *GV = dyn_cast<llvm::GlobalVariable>(Entry);
2290
2291 // We have a definition after a declaration with the wrong type.
2292 // We must make a new GlobalVariable* and update everything that used OldGV
2293 // (a declaration or tentative definition) with the new GlobalVariable*
2294 // (which will be a definition).
2295 //
2296 // This happens if there is a prototype for a global (e.g.
2297 // "extern int x[];") and then a definition of a different type (e.g.
2298 // "int x[10];"). This also happens when an initializer has a different type
2299 // from the type of the global (this happens with unions).
2300 if (!GV ||
2301 GV->getType()->getElementType() != InitType ||
2302 GV->getType()->getAddressSpace() !=
2303 GetGlobalVarAddressSpace(D, getContext().getTargetAddressSpace(ASTTy))) {
2304
2305 // Move the old entry aside so that we'll create a new one.
2306 Entry->setName(StringRef());
2307
2308 // Make a new global with the correct type, this is now guaranteed to work.
2309 GV = cast<llvm::GlobalVariable>(
2310 GetAddrOfGlobalVar(D, InitType, /*IsForDefinition=*/!IsTentative));
2311
2312 // Replace all uses of the old global with the new global
2313 llvm::Constant *NewPtrForOldDecl =
2314 llvm::ConstantExpr::getBitCast(GV, Entry->getType());
2315 Entry->replaceAllUsesWith(NewPtrForOldDecl);
2316
2317 // Erase the old global, since it is no longer used.
2318 cast<llvm::GlobalValue>(Entry)->eraseFromParent();
2319 }
2320
2321 MaybeHandleStaticInExternC(D, GV);
2322
2323 if (D->hasAttr<AnnotateAttr>())
2324 AddGlobalAnnotations(D, GV);
2325
2326 // CUDA B.2.1 "The __device__ qualifier declares a variable that resides on
2327 // the device. [...]"
2328 // CUDA B.2.2 "The __constant__ qualifier, optionally used together with
2329 // __device__, declares a variable that: [...]
2330 // Is accessible from all the threads within the grid and from the host
2331 // through the runtime library (cudaGetSymbolAddress() / cudaGetSymbolSize()
2332 // / cudaMemcpyToSymbol() / cudaMemcpyFromSymbol())."
2333 if (GV && LangOpts.CUDA && LangOpts.CUDAIsDevice &&
2334 (D->hasAttr<CUDAConstantAttr>() || D->hasAttr<CUDADeviceAttr>())) {
2335 GV->setExternallyInitialized(true);
2336 }
2337 GV->setInitializer(Init);
2338
2339 // If it is safe to mark the global 'constant', do so now.
2340 GV->setConstant(!NeedsGlobalCtor && !NeedsGlobalDtor &&
2341 isTypeConstant(D->getType(), true));
2342
2343 // If it is in a read-only section, mark it 'constant'.
2344 if (const SectionAttr *SA = D->getAttr<SectionAttr>()) {
2345 const ASTContext::SectionInfo &SI = Context.SectionInfos[SA->getName()];
2346 if ((SI.SectionFlags & ASTContext::PSF_Write) == 0)
2347 GV->setConstant(true);
2348 }
2349
2350 GV->setAlignment(getContext().getDeclAlign(D).getQuantity());
2351
2352 // Set the llvm linkage type as appropriate.
2353 llvm::GlobalValue::LinkageTypes Linkage =
2354 getLLVMLinkageVarDefinition(D, GV->isConstant());
2355
2356 // On Darwin, if the normal linkage of a C++ thread_local variable is
2357 // LinkOnce or Weak, we keep the normal linkage to prevent multiple
2358 // copies within a linkage unit; otherwise, the backing variable has
2359 // internal linkage and all accesses should just be calls to the
2360 // Itanium-specified entry point, which has the normal linkage of the
2361 // variable. This is to preserve the ability to change the implementation
2362 // behind the scenes.
2363 if (!D->isStaticLocal() && D->getTLSKind() == VarDecl::TLS_Dynamic &&
2364 Context.getTargetInfo().getTriple().isOSDarwin() &&
2365 !llvm::GlobalVariable::isLinkOnceLinkage(Linkage) &&
2366 !llvm::GlobalVariable::isWeakLinkage(Linkage))
2367 Linkage = llvm::GlobalValue::InternalLinkage;
2368
2369 GV->setLinkage(Linkage);
2370 if (D->hasAttr<DLLImportAttr>())
2371 GV->setDLLStorageClass(llvm::GlobalVariable::DLLImportStorageClass);
2372 else if (D->hasAttr<DLLExportAttr>())
2373 GV->setDLLStorageClass(llvm::GlobalVariable::DLLExportStorageClass);
2374 else
2375 GV->setDLLStorageClass(llvm::GlobalVariable::DefaultStorageClass);
2376
2377 if (Linkage == llvm::GlobalVariable::CommonLinkage)
2378 // common vars aren't constant even if declared const.
2379 GV->setConstant(false);
2380
2381 setNonAliasAttributes(D, GV);
2382
2383 if (D->getTLSKind() && !GV->isThreadLocal()) {
2384 if (D->getTLSKind() == VarDecl::TLS_Dynamic)
2385 CXXThreadLocals.push_back(D);
2386 setTLSMode(GV, *D);
2387 }
2388
2389 maybeSetTrivialComdat(*D, *GV);
2390
2391 // Emit the initializer function if necessary.
2392 if (NeedsGlobalCtor || NeedsGlobalDtor)
2393 EmitCXXGlobalVarDeclInitFunc(D, GV, NeedsGlobalCtor);
2394
2395 SanitizerMD->reportGlobalToASan(GV, *D, NeedsGlobalCtor);
2396
2397 // Emit global variable debug information.
2398 if (CGDebugInfo *DI = getModuleDebugInfo())
2399 if (getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo)
2400 DI->EmitGlobalVariable(GV, D);
2401}
2402
2403static bool isVarDeclStrongDefinition(const ASTContext &Context,
2404 CodeGenModule &CGM, const VarDecl *D,
2405 bool NoCommon) {
2406 // Don't give variables common linkage if -fno-common was specified unless it
2407 // was overridden by a NoCommon attribute.
2408 if ((NoCommon || D->hasAttr<NoCommonAttr>()) && !D->hasAttr<CommonAttr>())
2409 return true;
2410
2411 // C11 6.9.2/2:
2412 // A declaration of an identifier for an object that has file scope without
2413 // an initializer, and without a storage-class specifier or with the
2414 // storage-class specifier static, constitutes a tentative definition.
2415 if (D->getInit() || D->hasExternalStorage())
2416 return true;
2417
2418 // A variable cannot be both common and exist in a section.
2419 if (D->hasAttr<SectionAttr>())
2420 return true;
2421
2422 // Thread local vars aren't considered common linkage.
2423 if (D->getTLSKind())
2424 return true;
2425
2426 // Tentative definitions marked with WeakImportAttr are true definitions.
2427 if (D->hasAttr<WeakImportAttr>())
2428 return true;
2429
2430 // A variable cannot be both common and exist in a comdat.
2431 if (shouldBeInCOMDAT(CGM, *D))
2432 return true;
2433
2434 // Declarations with a required alignment do not have common linakge in MSVC
2435 // mode.
2436 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
2437 if (D->hasAttr<AlignedAttr>())
2438 return true;
2439 QualType VarType = D->getType();
2440 if (Context.isAlignmentRequired(VarType))
2441 return true;
2442
2443 if (const auto *RT = VarType->getAs<RecordType>()) {
2444 const RecordDecl *RD = RT->getDecl();
2445 for (const FieldDecl *FD : RD->fields()) {
2446 if (FD->isBitField())
2447 continue;
2448 if (FD->hasAttr<AlignedAttr>())
2449 return true;
2450 if (Context.isAlignmentRequired(FD->getType()))
2451 return true;
2452 }
2453 }
2454 }
2455
2456 return false;
2457}
2458
2459llvm::GlobalValue::LinkageTypes CodeGenModule::getLLVMLinkageForDeclarator(
2460 const DeclaratorDecl *D, GVALinkage Linkage, bool IsConstantVariable) {
2461 if (Linkage == GVA_Internal)
2462 return llvm::Function::InternalLinkage;
2463
2464 if (D->hasAttr<WeakAttr>()) {
2465 if (IsConstantVariable)
2466 return llvm::GlobalVariable::WeakODRLinkage;
2467 else
2468 return llvm::GlobalVariable::WeakAnyLinkage;
2469 }
2470
2471 // We are guaranteed to have a strong definition somewhere else,
2472 // so we can use available_externally linkage.
2473 if (Linkage == GVA_AvailableExternally)
2474 return llvm::Function::AvailableExternallyLinkage;
2475
2476 // Note that Apple's kernel linker doesn't support symbol
2477 // coalescing, so we need to avoid linkonce and weak linkages there.
2478 // Normally, this means we just map to internal, but for explicit
2479 // instantiations we'll map to external.
2480
2481 // In C++, the compiler has to emit a definition in every translation unit
2482 // that references the function. We should use linkonce_odr because
2483 // a) if all references in this translation unit are optimized away, we
2484 // don't need to codegen it. b) if the function persists, it needs to be
2485 // merged with other definitions. c) C++ has the ODR, so we know the
2486 // definition is dependable.
2487 if (Linkage == GVA_DiscardableODR)
2488 return !Context.getLangOpts().AppleKext ? llvm::Function::LinkOnceODRLinkage
2489 : llvm::Function::InternalLinkage;
2490
2491 // An explicit instantiation of a template has weak linkage, since
2492 // explicit instantiations can occur in multiple translation units
2493 // and must all be equivalent. However, we are not allowed to
2494 // throw away these explicit instantiations.
2495 if (Linkage == GVA_StrongODR)
2496 return !Context.getLangOpts().AppleKext ? llvm::Function::WeakODRLinkage
2497 : llvm::Function::ExternalLinkage;
2498
2499 // C++ doesn't have tentative definitions and thus cannot have common
2500 // linkage.
2501 if (!getLangOpts().CPlusPlus && isa<VarDecl>(D) &&
2502 !isVarDeclStrongDefinition(Context, *this, cast<VarDecl>(D),
2503 CodeGenOpts.NoCommon))
2504 return llvm::GlobalVariable::CommonLinkage;
2505
2506 // selectany symbols are externally visible, so use weak instead of
2507 // linkonce. MSVC optimizes away references to const selectany globals, so
2508 // all definitions should be the same and ODR linkage should be used.
2509 // http://msdn.microsoft.com/en-us/library/5tkz6s71.aspx
2510 if (D->hasAttr<SelectAnyAttr>())
2511 return llvm::GlobalVariable::WeakODRLinkage;
2512
2513 // Otherwise, we have strong external linkage.
2514 assert(Linkage == GVA_StrongExternal)((Linkage == GVA_StrongExternal) ? static_cast<void> (0
) : __assert_fail ("Linkage == GVA_StrongExternal", "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2514, __PRETTY_FUNCTION__))
;
2515 return llvm::GlobalVariable::ExternalLinkage;
2516}
2517
2518llvm::GlobalValue::LinkageTypes CodeGenModule::getLLVMLinkageVarDefinition(
2519 const VarDecl *VD, bool IsConstant) {
2520 GVALinkage Linkage = getContext().GetGVALinkageForVariable(VD);
2521 return getLLVMLinkageForDeclarator(VD, Linkage, IsConstant);
2522}
2523
2524/// Replace the uses of a function that was declared with a non-proto type.
2525/// We want to silently drop extra arguments from call sites
2526static void replaceUsesOfNonProtoConstant(llvm::Constant *old,
2527 llvm::Function *newFn) {
2528 // Fast path.
2529 if (old->use_empty()) return;
2530
2531 llvm::Type *newRetTy = newFn->getReturnType();
2532 SmallVector<llvm::Value*, 4> newArgs;
2533
2534 for (llvm::Value::use_iterator ui = old->use_begin(), ue = old->use_end();
2535 ui != ue; ) {
2536 llvm::Value::use_iterator use = ui++; // Increment before the use is erased.
2537 llvm::User *user = use->getUser();
2538
2539 // Recognize and replace uses of bitcasts. Most calls to
2540 // unprototyped functions will use bitcasts.
2541 if (auto *bitcast = dyn_cast<llvm::ConstantExpr>(user)) {
2542 if (bitcast->getOpcode() == llvm::Instruction::BitCast)
2543 replaceUsesOfNonProtoConstant(bitcast, newFn);
2544 continue;
2545 }
2546
2547 // Recognize calls to the function.
2548 llvm::CallSite callSite(user);
2549 if (!callSite) continue;
2550 if (!callSite.isCallee(&*use)) continue;
2551
2552 // If the return types don't match exactly, then we can't
2553 // transform this call unless it's dead.
2554 if (callSite->getType() != newRetTy && !callSite->use_empty())
2555 continue;
2556
2557 // Get the call site's attribute list.
2558 SmallVector<llvm::AttributeSet, 8> newAttrs;
2559 llvm::AttributeSet oldAttrs = callSite.getAttributes();
2560
2561 // Collect any return attributes from the call.
2562 if (oldAttrs.hasAttributes(llvm::AttributeSet::ReturnIndex))
2563 newAttrs.push_back(
2564 llvm::AttributeSet::get(newFn->getContext(),
2565 oldAttrs.getRetAttributes()));
2566
2567 // If the function was passed too few arguments, don't transform.
2568 unsigned newNumArgs = newFn->arg_size();
2569 if (callSite.arg_size() < newNumArgs) continue;
2570
2571 // If extra arguments were passed, we silently drop them.
2572 // If any of the types mismatch, we don't transform.
2573 unsigned argNo = 0;
2574 bool dontTransform = false;
2575 for (llvm::Function::arg_iterator ai = newFn->arg_begin(),
2576 ae = newFn->arg_end(); ai != ae; ++ai, ++argNo) {
2577 if (callSite.getArgument(argNo)->getType() != ai->getType()) {
2578 dontTransform = true;
2579 break;
2580 }
2581
2582 // Add any parameter attributes.
2583 if (oldAttrs.hasAttributes(argNo + 1))
2584 newAttrs.
2585 push_back(llvm::
2586 AttributeSet::get(newFn->getContext(),
2587 oldAttrs.getParamAttributes(argNo + 1)));
2588 }
2589 if (dontTransform)
2590 continue;
2591
2592 if (oldAttrs.hasAttributes(llvm::AttributeSet::FunctionIndex))
2593 newAttrs.push_back(llvm::AttributeSet::get(newFn->getContext(),
2594 oldAttrs.getFnAttributes()));
2595
2596 // Okay, we can transform this. Create the new call instruction and copy
2597 // over the required information.
2598 newArgs.append(callSite.arg_begin(), callSite.arg_begin() + argNo);
2599
2600 llvm::CallSite newCall;
2601 if (callSite.isCall()) {
2602 newCall = llvm::CallInst::Create(newFn, newArgs, "",
2603 callSite.getInstruction());
2604 } else {
2605 auto *oldInvoke = cast<llvm::InvokeInst>(callSite.getInstruction());
2606 newCall = llvm::InvokeInst::Create(newFn,
2607 oldInvoke->getNormalDest(),
2608 oldInvoke->getUnwindDest(),
2609 newArgs, "",
2610 callSite.getInstruction());
2611 }
2612 newArgs.clear(); // for the next iteration
2613
2614 if (!newCall->getType()->isVoidTy())
2615 newCall->takeName(callSite.getInstruction());
2616 newCall.setAttributes(
2617 llvm::AttributeSet::get(newFn->getContext(), newAttrs));
2618 newCall.setCallingConv(callSite.getCallingConv());
2619
2620 // Finally, remove the old call, replacing any uses with the new one.
2621 if (!callSite->use_empty())
2622 callSite->replaceAllUsesWith(newCall.getInstruction());
2623
2624 // Copy debug location attached to CI.
2625 if (callSite->getDebugLoc())
2626 newCall->setDebugLoc(callSite->getDebugLoc());
2627 callSite->eraseFromParent();
2628 }
2629}
2630
2631/// ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we
2632/// implement a function with no prototype, e.g. "int foo() {}". If there are
2633/// existing call uses of the old function in the module, this adjusts them to
2634/// call the new function directly.
2635///
2636/// This is not just a cleanup: the always_inline pass requires direct calls to
2637/// functions to be able to inline them. If there is a bitcast in the way, it
2638/// won't inline them. Instcombine normally deletes these calls, but it isn't
2639/// run at -O0.
2640static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old,
2641 llvm::Function *NewFn) {
2642 // If we're redefining a global as a function, don't transform it.
2643 if (!isa<llvm::Function>(Old)) return;
2644
2645 replaceUsesOfNonProtoConstant(Old, NewFn);
2646}
2647
2648void CodeGenModule::HandleCXXStaticMemberVarInstantiation(VarDecl *VD) {
2649 TemplateSpecializationKind TSK = VD->getTemplateSpecializationKind();
2650 // If we have a definition, this might be a deferred decl. If the
2651 // instantiation is explicit, make sure we emit it at the end.
2652 if (VD->getDefinition() && TSK == TSK_ExplicitInstantiationDefinition)
2653 GetAddrOfGlobalVar(VD);
2654
2655 EmitTopLevelDecl(VD);
2656}
2657
2658void CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD,
2659 llvm::GlobalValue *GV) {
2660 const auto *D = cast<FunctionDecl>(GD.getDecl());
2661
2662 // Compute the function info and LLVM type.
2663 const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
2664 llvm::FunctionType *Ty = getTypes().GetFunctionType(FI);
2665
2666 // Get or create the prototype for the function.
2667 if (!GV || (GV->getType()->getElementType() != Ty))
2668 GV = cast<llvm::GlobalValue>(GetAddrOfFunction(GD, Ty, /*ForVTable=*/false,
2669 /*DontDefer=*/true,
2670 /*IsForDefinition=*/true));
2671
2672 // Already emitted.
2673 if (!GV->isDeclaration())
2674 return;
2675
2676 // We need to set linkage and visibility on the function before
2677 // generating code for it because various parts of IR generation
2678 // want to propagate this information down (e.g. to local static
2679 // declarations).
2680 auto *Fn = cast<llvm::Function>(GV);
2681 setFunctionLinkage(GD, Fn);
2682 setFunctionDLLStorageClass(GD, Fn);
2683
2684 // FIXME: this is redundant with part of setFunctionDefinitionAttributes
2685 setGlobalVisibility(Fn, D);
2686
2687 MaybeHandleStaticInExternC(D, Fn);
2688
2689 maybeSetTrivialComdat(*D, *Fn);
2690
2691 CodeGenFunction(*this).GenerateCode(D, Fn, FI);
2692
2693 setFunctionDefinitionAttributes(D, Fn);
2694 SetLLVMFunctionAttributesForDefinition(D, Fn);
2695
2696 if (const ConstructorAttr *CA = D->getAttr<ConstructorAttr>())
2697 AddGlobalCtor(Fn, CA->getPriority());
2698 if (const DestructorAttr *DA = D->getAttr<DestructorAttr>())
2699 AddGlobalDtor(Fn, DA->getPriority());
2700 if (D->hasAttr<AnnotateAttr>())
2701 AddGlobalAnnotations(D, Fn);
2702}
2703
2704void CodeGenModule::EmitAliasDefinition(GlobalDecl GD) {
2705 const auto *D = cast<ValueDecl>(GD.getDecl());
2706 const AliasAttr *AA = D->getAttr<AliasAttr>();
2707 assert(AA && "Not an alias?")((AA && "Not an alias?") ? static_cast<void> (0
) : __assert_fail ("AA && \"Not an alias?\"", "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2707, __PRETTY_FUNCTION__))
;
2708
2709 StringRef MangledName = getMangledName(GD);
2710
2711 if (AA->getAliasee() == MangledName) {
2712 Diags.Report(AA->getLocation(), diag::err_cyclic_alias);
2713 return;
2714 }
2715
2716 // If there is a definition in the module, then it wins over the alias.
2717 // This is dubious, but allow it to be safe. Just ignore the alias.
2718 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
2719 if (Entry && !Entry->isDeclaration())
2720 return;
2721
2722 Aliases.push_back(GD);
2723
2724 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType());
2725
2726 // Create a reference to the named value. This ensures that it is emitted
2727 // if a deferred decl.
2728 llvm::Constant *Aliasee;
2729 if (isa<llvm::FunctionType>(DeclTy))
2730 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy, GD,
2731 /*ForVTable=*/false);
2732 else
2733 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
2734 llvm::PointerType::getUnqual(DeclTy),
2735 /*D=*/nullptr);
2736
2737 // Create the new alias itself, but don't set a name yet.
2738 auto *GA = llvm::GlobalAlias::create(
2739 DeclTy, 0, llvm::Function::ExternalLinkage, "", Aliasee, &getModule());
2740
2741 if (Entry) {
2742 if (GA->getAliasee() == Entry) {
2743 Diags.Report(AA->getLocation(), diag::err_cyclic_alias);
2744 return;
2745 }
2746
2747 assert(Entry->isDeclaration())((Entry->isDeclaration()) ? static_cast<void> (0) : __assert_fail
("Entry->isDeclaration()", "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2747, __PRETTY_FUNCTION__))
;
2748
2749 // If there is a declaration in the module, then we had an extern followed
2750 // by the alias, as in:
2751 // extern int test6();
2752 // ...
2753 // int test6() __attribute__((alias("test7")));
2754 //
2755 // Remove it and replace uses of it with the alias.
2756 GA->takeName(Entry);
2757
2758 Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GA,
2759 Entry->getType()));
2760 Entry->eraseFromParent();
2761 } else {
2762 GA->setName(MangledName);
2763 }
2764
2765 // Set attributes which are particular to an alias; this is a
2766 // specialization of the attributes which may be set on a global
2767 // variable/function.
2768 if (D->hasAttr<WeakAttr>() || D->hasAttr<WeakRefAttr>() ||
2769 D->isWeakImported()) {
2770 GA->setLinkage(llvm::Function::WeakAnyLinkage);
2771 }
2772
2773 if (const auto *VD = dyn_cast<VarDecl>(D))
2774 if (VD->getTLSKind())
2775 setTLSMode(GA, *VD);
2776
2777 setAliasAttributes(D, GA);
2778}
2779
2780llvm::Function *CodeGenModule::getIntrinsic(unsigned IID,
2781 ArrayRef<llvm::Type*> Tys) {
2782 return llvm::Intrinsic::getDeclaration(&getModule(), (llvm::Intrinsic::ID)IID,
2783 Tys);
2784}
2785
2786static llvm::StringMapEntry<llvm::GlobalVariable *> &
2787GetConstantCFStringEntry(llvm::StringMap<llvm::GlobalVariable *> &Map,
2788 const StringLiteral *Literal, bool TargetIsLSB,
2789 bool &IsUTF16, unsigned &StringLength) {
2790 StringRef String = Literal->getString();
2791 unsigned NumBytes = String.size();
2792
2793 // Check for simple case.
2794 if (!Literal->containsNonAsciiOrNull()) {
2795 StringLength = NumBytes;
2796 return *Map.insert(std::make_pair(String, nullptr)).first;
2797 }
2798
2799 // Otherwise, convert the UTF8 literals into a string of shorts.
2800 IsUTF16 = true;
2801
2802 SmallVector<UTF16, 128> ToBuf(NumBytes + 1); // +1 for ending nulls.
2803 const UTF8 *FromPtr = (const UTF8 *)String.data();
2804 UTF16 *ToPtr = &ToBuf[0];
2805
2806 (void)ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes,
2807 &ToPtr, ToPtr + NumBytes,
2808 strictConversion);
2809
2810 // ConvertUTF8toUTF16 returns the length in ToPtr.
2811 StringLength = ToPtr - &ToBuf[0];
2812
2813 // Add an explicit null.
2814 *ToPtr = 0;
2815 return *Map.insert(std::make_pair(
2816 StringRef(reinterpret_cast<const char *>(ToBuf.data()),
2817 (StringLength + 1) * 2),
2818 nullptr)).first;
2819}
2820
2821static llvm::StringMapEntry<llvm::GlobalVariable *> &
2822GetConstantStringEntry(llvm::StringMap<llvm::GlobalVariable *> &Map,
2823 const StringLiteral *Literal, unsigned &StringLength) {
2824 StringRef String = Literal->getString();
2825 StringLength = String.size();
2826 return *Map.insert(std::make_pair(String, nullptr)).first;
2827}
2828
2829ConstantAddress
2830CodeGenModule::GetAddrOfConstantCFString(const StringLiteral *Literal) {
2831 unsigned StringLength = 0;
2832 bool isUTF16 = false;
2833 llvm::StringMapEntry<llvm::GlobalVariable *> &Entry =
2834 GetConstantCFStringEntry(CFConstantStringMap, Literal,
2835 getDataLayout().isLittleEndian(), isUTF16,
2836 StringLength);
2837
2838 if (auto *C = Entry.second)
2839 return ConstantAddress(C, CharUnits::fromQuantity(C->getAlignment()));
2840
2841 llvm::Constant *Zero = llvm::Constant::getNullValue(Int32Ty);
2842 llvm::Constant *Zeros[] = { Zero, Zero };
2843 llvm::Value *V;
2844
2845 // If we don't already have it, get __CFConstantStringClassReference.
2846 if (!CFConstantStringClassRef) {
2847 llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy);
2848 Ty = llvm::ArrayType::get(Ty, 0);
2849 llvm::Constant *GV = CreateRuntimeVariable(Ty,
2850 "__CFConstantStringClassReference");
2851 // Decay array -> ptr
2852 V = llvm::ConstantExpr::getGetElementPtr(Ty, GV, Zeros);
2853 CFConstantStringClassRef = V;
2854 }
2855 else
2856 V = CFConstantStringClassRef;
2857
2858 QualType CFTy = getContext().getCFConstantStringType();
2859
2860 auto *STy = cast<llvm::StructType>(getTypes().ConvertType(CFTy));
2861
2862 llvm::Constant *Fields[4];
2863
2864 // Class pointer.
2865 Fields[0] = cast<llvm::ConstantExpr>(V);
2866
2867 // Flags.
2868 llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy);
2869 Fields[1] = isUTF16 ? llvm::ConstantInt::get(Ty, 0x07d0) :
2870 llvm::ConstantInt::get(Ty, 0x07C8);
2871
2872 // String pointer.
2873 llvm::Constant *C = nullptr;
2874 if (isUTF16) {
2875 auto Arr = llvm::makeArrayRef(
2876 reinterpret_cast<uint16_t *>(const_cast<char *>(Entry.first().data())),
2877 Entry.first().size() / 2);
2878 C = llvm::ConstantDataArray::get(VMContext, Arr);
2879 } else {
2880 C = llvm::ConstantDataArray::getString(VMContext, Entry.first());
2881 }
2882
2883 // Note: -fwritable-strings doesn't make the backing store strings of
2884 // CFStrings writable. (See <rdar://problem/10657500>)
2885 auto *GV =
2886 new llvm::GlobalVariable(getModule(), C->getType(), /*isConstant=*/true,
2887 llvm::GlobalValue::PrivateLinkage, C, ".str");
2888 GV->setUnnamedAddr(true);
2889 // Don't enforce the target's minimum global alignment, since the only use
2890 // of the string is via this class initializer.
2891 // FIXME: We set the section explicitly to avoid a bug in ld64 224.1. Without
2892 // it LLVM can merge the string with a non unnamed_addr one during LTO. Doing
2893 // that changes the section it ends in, which surprises ld64.
2894 if (isUTF16) {
2895 CharUnits Align = getContext().getTypeAlignInChars(getContext().ShortTy);
2896 GV->setAlignment(Align.getQuantity());
2897 GV->setSection("__TEXT,__ustring");
2898 } else {
2899 CharUnits Align = getContext().getTypeAlignInChars(getContext().CharTy);
2900 GV->setAlignment(Align.getQuantity());
2901 GV->setSection("__TEXT,__cstring,cstring_literals");
2902 }
2903
2904 // String.
2905 Fields[2] =
2906 llvm::ConstantExpr::getGetElementPtr(GV->getValueType(), GV, Zeros);
2907
2908 if (isUTF16)
2909 // Cast the UTF16 string to the correct type.
2910 Fields[2] = llvm::ConstantExpr::getBitCast(Fields[2], Int8PtrTy);
2911
2912 // String length.
2913 Ty = getTypes().ConvertType(getContext().LongTy);
2914 Fields[3] = llvm::ConstantInt::get(Ty, StringLength);
2915
2916 CharUnits Alignment = getPointerAlign();
2917
2918 // The struct.
2919 C = llvm::ConstantStruct::get(STy, Fields);
2920 GV = new llvm::GlobalVariable(getModule(), C->getType(), true,
2921 llvm::GlobalVariable::PrivateLinkage, C,
2922 "_unnamed_cfstring_");
2923 GV->setSection("__DATA,__cfstring");
2924 GV->setAlignment(Alignment.getQuantity());
2925 Entry.second = GV;
2926
2927 return ConstantAddress(GV, Alignment);
2928}
2929
2930ConstantAddress
2931CodeGenModule::GetAddrOfConstantString(const StringLiteral *Literal) {
2932 unsigned StringLength = 0;
2933 llvm::StringMapEntry<llvm::GlobalVariable *> &Entry =
2934 GetConstantStringEntry(CFConstantStringMap, Literal, StringLength);
2935
2936 if (auto *C = Entry.second)
2937 return ConstantAddress(C, CharUnits::fromQuantity(C->getAlignment()));
2938
2939 llvm::Constant *Zero = llvm::Constant::getNullValue(Int32Ty);
2940 llvm::Constant *Zeros[] = { Zero, Zero };
2941 llvm::Value *V;
2942 // If we don't already have it, get _NSConstantStringClassReference.
2943 if (!ConstantStringClassRef) {
2944 std::string StringClass(getLangOpts().ObjCConstantStringClass);
2945 llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy);
2946 llvm::Constant *GV;
2947 if (LangOpts.ObjCRuntime.isNonFragile()) {
2948 std::string str =
2949 StringClass.empty() ? "OBJC_CLASS_$_NSConstantString"
2950 : "OBJC_CLASS_$_" + StringClass;
2951 GV = getObjCRuntime().GetClassGlobal(str);
2952 // Make sure the result is of the correct type.
2953 llvm::Type *PTy = llvm::PointerType::getUnqual(Ty);
2954 V = llvm::ConstantExpr::getBitCast(GV, PTy);
2955 ConstantStringClassRef = V;
2956 } else {
2957 std::string str =
2958 StringClass.empty() ? "_NSConstantStringClassReference"
2959 : "_" + StringClass + "ClassReference";
2960 llvm::Type *PTy = llvm::ArrayType::get(Ty, 0);
2961 GV = CreateRuntimeVariable(PTy, str);
2962 // Decay array -> ptr
2963 V = llvm::ConstantExpr::getGetElementPtr(PTy, GV, Zeros);
2964 ConstantStringClassRef = V;
2965 }
2966 } else
2967 V = ConstantStringClassRef;
2968
2969 if (!NSConstantStringType) {
2970 // Construct the type for a constant NSString.
2971 RecordDecl *D = Context.buildImplicitRecord("__builtin_NSString");
2972 D->startDefinition();
2973
2974 QualType FieldTypes[3];
2975
2976 // const int *isa;
2977 FieldTypes[0] = Context.getPointerType(Context.IntTy.withConst());
2978 // const char *str;
2979 FieldTypes[1] = Context.getPointerType(Context.CharTy.withConst());
2980 // unsigned int length;
2981 FieldTypes[2] = Context.UnsignedIntTy;
2982
2983 // Create fields
2984 for (unsigned i = 0; i < 3; ++i) {
2985 FieldDecl *Field = FieldDecl::Create(Context, D,
2986 SourceLocation(),
2987 SourceLocation(), nullptr,
2988 FieldTypes[i], /*TInfo=*/nullptr,
2989 /*BitWidth=*/nullptr,
2990 /*Mutable=*/false,
2991 ICIS_NoInit);
2992 Field->setAccess(AS_public);
2993 D->addDecl(Field);
2994 }
2995
2996 D->completeDefinition();
2997 QualType NSTy = Context.getTagDeclType(D);
2998 NSConstantStringType = cast<llvm::StructType>(getTypes().ConvertType(NSTy));
2999 }
3000
3001 llvm::Constant *Fields[3];
3002
3003 // Class pointer.
3004 Fields[0] = cast<llvm::ConstantExpr>(V);
3005
3006 // String pointer.
3007 llvm::Constant *C =
3008 llvm::ConstantDataArray::getString(VMContext, Entry.first());
3009
3010 llvm::GlobalValue::LinkageTypes Linkage;
3011 bool isConstant;
3012 Linkage = llvm::GlobalValue::PrivateLinkage;
3013 isConstant = !LangOpts.WritableStrings;
3014
3015 auto *GV = new llvm::GlobalVariable(getModule(), C->getType(), isConstant,
3016 Linkage, C, ".str");
3017 GV->setUnnamedAddr(true);
3018 // Don't enforce the target's minimum global alignment, since the only use
3019 // of the string is via this class initializer.
3020 CharUnits Align = getContext().getTypeAlignInChars(getContext().CharTy);
3021 GV->setAlignment(Align.getQuantity());
3022 Fields[1] =
3023 llvm::ConstantExpr::getGetElementPtr(GV->getValueType(), GV, Zeros);
3024
3025 // String length.
3026 llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy);
3027 Fields[2] = llvm::ConstantInt::get(Ty, StringLength);
3028
3029 // The struct.
3030 CharUnits Alignment = getPointerAlign();
3031 C = llvm::ConstantStruct::get(NSConstantStringType, Fields);
3032 GV = new llvm::GlobalVariable(getModule(), C->getType(), true,
3033 llvm::GlobalVariable::PrivateLinkage, C,
3034 "_unnamed_nsstring_");
3035 GV->setAlignment(Alignment.getQuantity());
3036 const char *NSStringSection = "__OBJC,__cstring_object,regular,no_dead_strip";
3037 const char *NSStringNonFragileABISection =
3038 "__DATA,__objc_stringobj,regular,no_dead_strip";
3039 // FIXME. Fix section.
3040 GV->setSection(LangOpts.ObjCRuntime.isNonFragile()
3041 ? NSStringNonFragileABISection
3042 : NSStringSection);
3043 Entry.second = GV;
3044
3045 return ConstantAddress(GV, Alignment);
3046}
3047
3048QualType CodeGenModule::getObjCFastEnumerationStateType() {
3049 if (ObjCFastEnumerationStateType.isNull()) {
3050 RecordDecl *D = Context.buildImplicitRecord("__objcFastEnumerationState");
3051 D->startDefinition();
3052
3053 QualType FieldTypes[] = {
3054 Context.UnsignedLongTy,
3055 Context.getPointerType(Context.getObjCIdType()),
3056 Context.getPointerType(Context.UnsignedLongTy),
3057 Context.getConstantArrayType(Context.UnsignedLongTy,
3058 llvm::APInt(32, 5), ArrayType::Normal, 0)
3059 };
3060
3061 for (size_t i = 0; i < 4; ++i) {
3062 FieldDecl *Field = FieldDecl::Create(Context,
3063 D,
3064 SourceLocation(),
3065 SourceLocation(), nullptr,
3066 FieldTypes[i], /*TInfo=*/nullptr,
3067 /*BitWidth=*/nullptr,
3068 /*Mutable=*/false,
3069 ICIS_NoInit);
3070 Field->setAccess(AS_public);
3071 D->addDecl(Field);
3072 }
3073
3074 D->completeDefinition();
3075 ObjCFastEnumerationStateType = Context.getTagDeclType(D);
3076 }
3077
3078 return ObjCFastEnumerationStateType;
3079}
3080
3081llvm::Constant *
3082CodeGenModule::GetConstantArrayFromStringLiteral(const StringLiteral *E) {
3083 assert(!E->getType()->isPointerType() && "Strings are always arrays")((!E->getType()->isPointerType() && "Strings are always arrays"
) ? static_cast<void> (0) : __assert_fail ("!E->getType()->isPointerType() && \"Strings are always arrays\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 3083, __PRETTY_FUNCTION__))
;
3084
3085 // Don't emit it as the address of the string, emit the string data itself
3086 // as an inline array.
3087 if (E->getCharByteWidth() == 1) {
3088 SmallString<64> Str(E->getString());
3089
3090 // Resize the string to the right size, which is indicated by its type.
3091 const ConstantArrayType *CAT = Context.getAsConstantArrayType(E->getType());
3092 Str.resize(CAT->getSize().getZExtValue());
3093 return llvm::ConstantDataArray::getString(VMContext, Str, false);
3094 }
3095
3096 auto *AType = cast<llvm::ArrayType>(getTypes().ConvertType(E->getType()));
3097 llvm::Type *ElemTy = AType->getElementType();
3098 unsigned NumElements = AType->getNumElements();
3099
3100 // Wide strings have either 2-byte or 4-byte elements.
3101 if (ElemTy->getPrimitiveSizeInBits() == 16) {
3102 SmallVector<uint16_t, 32> Elements;
3103 Elements.reserve(NumElements);
3104
3105 for(unsigned i = 0, e = E->getLength(); i != e; ++i)
3106 Elements.push_back(E->getCodeUnit(i));
3107 Elements.resize(NumElements);
3108 return llvm::ConstantDataArray::get(VMContext, Elements);
3109 }
3110
3111 assert(ElemTy->getPrimitiveSizeInBits() == 32)((ElemTy->getPrimitiveSizeInBits() == 32) ? static_cast<
void> (0) : __assert_fail ("ElemTy->getPrimitiveSizeInBits() == 32"
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 3111, __PRETTY_FUNCTION__))
;
3112 SmallVector<uint32_t, 32> Elements;
3113 Elements.reserve(NumElements);
3114
3115 for(unsigned i = 0, e = E->getLength(); i != e; ++i)
3116 Elements.push_back(E->getCodeUnit(i));
3117 Elements.resize(NumElements);
3118 return llvm::ConstantDataArray::get(VMContext, Elements);
3119}
3120
3121static llvm::GlobalVariable *
3122GenerateStringLiteral(llvm::Constant *C, llvm::GlobalValue::LinkageTypes LT,
3123 CodeGenModule &CGM, StringRef GlobalName,
3124 CharUnits Alignment) {
3125 // OpenCL v1.2 s6.5.3: a string literal is in the constant address space.
3126 unsigned AddrSpace = 0;
3127 if (CGM.getLangOpts().OpenCL)
3128 AddrSpace = CGM.getContext().getTargetAddressSpace(LangAS::opencl_constant);
3129
3130 llvm::Module &M = CGM.getModule();
3131 // Create a global variable for this string
3132 auto *GV = new llvm::GlobalVariable(
3133 M, C->getType(), !CGM.getLangOpts().WritableStrings, LT, C, GlobalName,
3134 nullptr, llvm::GlobalVariable::NotThreadLocal, AddrSpace);
3135 GV->setAlignment(Alignment.getQuantity());
3136 GV->setUnnamedAddr(true);
3137 if (GV->isWeakForLinker()) {
3138 assert(CGM.supportsCOMDAT() && "Only COFF uses weak string literals")((CGM.supportsCOMDAT() && "Only COFF uses weak string literals"
) ? static_cast<void> (0) : __assert_fail ("CGM.supportsCOMDAT() && \"Only COFF uses weak string literals\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 3138, __PRETTY_FUNCTION__))
;
3139 GV->setComdat(M.getOrInsertComdat(GV->getName()));
3140 }
3141
3142 return GV;
3143}
3144
3145/// GetAddrOfConstantStringFromLiteral - Return a pointer to a
3146/// constant array for the given string literal.
3147ConstantAddress
3148CodeGenModule::GetAddrOfConstantStringFromLiteral(const StringLiteral *S,
3149 StringRef Name) {
3150 CharUnits Alignment = getContext().getAlignOfGlobalVarInChars(S->getType());
3151
3152 llvm::Constant *C = GetConstantArrayFromStringLiteral(S);
3153 llvm::GlobalVariable **Entry = nullptr;
3154 if (!LangOpts.WritableStrings) {
3155 Entry = &ConstantStringMap[C];
3156 if (auto GV = *Entry) {
3157 if (Alignment.getQuantity() > GV->getAlignment())
3158 GV->setAlignment(Alignment.getQuantity());
3159 return ConstantAddress(GV, Alignment);
3160 }
3161 }
3162
3163 SmallString<256> MangledNameBuffer;
3164 StringRef GlobalVariableName;
3165 llvm::GlobalValue::LinkageTypes LT;
3166
3167 // Mangle the string literal if the ABI allows for it. However, we cannot
3168 // do this if we are compiling with ASan or -fwritable-strings because they
3169 // rely on strings having normal linkage.
3170 if (!LangOpts.WritableStrings &&
3171 !LangOpts.Sanitize.has(SanitizerKind::Address) &&
3172 getCXXABI().getMangleContext().shouldMangleStringLiteral(S)) {
3173 llvm::raw_svector_ostream Out(MangledNameBuffer);
3174 getCXXABI().getMangleContext().mangleStringLiteral(S, Out);
3175
3176 LT = llvm::GlobalValue::LinkOnceODRLinkage;
3177 GlobalVariableName = MangledNameBuffer;
3178 } else {
3179 LT = llvm::GlobalValue::PrivateLinkage;
3180 GlobalVariableName = Name;
3181 }
3182
3183 auto GV = GenerateStringLiteral(C, LT, *this, GlobalVariableName, Alignment);
3184 if (Entry)
3185 *Entry = GV;
3186
3187 SanitizerMD->reportGlobalToASan(GV, S->getStrTokenLoc(0), "<string literal>",
3188 QualType());
3189 return ConstantAddress(GV, Alignment);
3190}
3191
3192/// GetAddrOfConstantStringFromObjCEncode - Return a pointer to a constant
3193/// array for the given ObjCEncodeExpr node.
3194ConstantAddress
3195CodeGenModule::GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *E) {
3196 std::string Str;
3197 getContext().getObjCEncodingForType(E->getEncodedType(), Str);
3198
3199 return GetAddrOfConstantCString(Str);
3200}
3201
3202/// GetAddrOfConstantCString - Returns a pointer to a character array containing
3203/// the literal and a terminating '\0' character.
3204/// The result has pointer to array type.
3205ConstantAddress CodeGenModule::GetAddrOfConstantCString(
3206 const std::string &Str, const char *GlobalName) {
3207 StringRef StrWithNull(Str.c_str(), Str.size() + 1);
3208 CharUnits Alignment =
3209 getContext().getAlignOfGlobalVarInChars(getContext().CharTy);
3210
3211 llvm::Constant *C =
3212 llvm::ConstantDataArray::getString(getLLVMContext(), StrWithNull, false);
3213
3214 // Don't share any string literals if strings aren't constant.
3215 llvm::GlobalVariable **Entry = nullptr;
3216 if (!LangOpts.WritableStrings) {
3217 Entry = &ConstantStringMap[C];
3218 if (auto GV = *Entry) {
3219 if (Alignment.getQuantity() > GV->getAlignment())
3220 GV->setAlignment(Alignment.getQuantity());
3221 return ConstantAddress(GV, Alignment);
3222 }
3223 }
3224
3225 // Get the default prefix if a name wasn't specified.
3226 if (!GlobalName)
3227 GlobalName = ".str";
3228 // Create a global variable for this.
3229 auto GV = GenerateStringLiteral(C, llvm::GlobalValue::PrivateLinkage, *this,
3230 GlobalName, Alignment);
3231 if (Entry)
3232 *Entry = GV;
3233 return ConstantAddress(GV, Alignment);
3234}
3235
3236ConstantAddress CodeGenModule::GetAddrOfGlobalTemporary(
3237 const MaterializeTemporaryExpr *E, const Expr *Init) {
3238 assert((E->getStorageDuration() == SD_Static ||(((E->getStorageDuration() == SD_Static || E->getStorageDuration
() == SD_Thread) && "not a global temporary") ? static_cast
<void> (0) : __assert_fail ("(E->getStorageDuration() == SD_Static || E->getStorageDuration() == SD_Thread) && \"not a global temporary\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 3239, __PRETTY_FUNCTION__))
3239 E->getStorageDuration() == SD_Thread) && "not a global temporary")(((E->getStorageDuration() == SD_Static || E->getStorageDuration
() == SD_Thread) && "not a global temporary") ? static_cast
<void> (0) : __assert_fail ("(E->getStorageDuration() == SD_Static || E->getStorageDuration() == SD_Thread) && \"not a global temporary\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 3239, __PRETTY_FUNCTION__))
;
3240 const auto *VD = cast<VarDecl>(E->getExtendingDecl());
3241
3242 // If we're not materializing a subobject of the temporary, keep the
3243 // cv-qualifiers from the type of the MaterializeTemporaryExpr.
3244 QualType MaterializedType = Init->getType();
3245 if (Init == E->GetTemporaryExpr())
3246 MaterializedType = E->getType();
3247
3248 CharUnits Align = getContext().getTypeAlignInChars(MaterializedType);
3249
3250 if (llvm::Constant *Slot = MaterializedGlobalTemporaryMap[E])
3251 return ConstantAddress(Slot, Align);
3252
3253 // FIXME: If an externally-visible declaration extends multiple temporaries,
3254 // we need to give each temporary the same name in every translation unit (and
3255 // we also need to make the temporaries externally-visible).
3256 SmallString<256> Name;
3257 llvm::raw_svector_ostream Out(Name);
3258 getCXXABI().getMangleContext().mangleReferenceTemporary(
3259 VD, E->getManglingNumber(), Out);
3260
3261 APValue *Value = nullptr;
3262 if (E->getStorageDuration() == SD_Static) {
3263 // We might have a cached constant initializer for this temporary. Note
3264 // that this might have a different value from the value computed by
3265 // evaluating the initializer if the surrounding constant expression
3266 // modifies the temporary.
3267 Value = getContext().getMaterializedTemporaryValue(E, false);
3268 if (Value && Value->isUninit())
3269 Value = nullptr;
3270 }
3271
3272 // Try evaluating it now, it might have a constant initializer.
3273 Expr::EvalResult EvalResult;
3274 if (!Value && Init->EvaluateAsRValue(EvalResult, getContext()) &&
3275 !EvalResult.hasSideEffects())
3276 Value = &EvalResult.Val;
3277
3278 llvm::Constant *InitialValue = nullptr;
3279 bool Constant = false;
3280 llvm::Type *Type;
3281 if (Value) {
3282 // The temporary has a constant initializer, use it.
3283 InitialValue = EmitConstantValue(*Value, MaterializedType, nullptr);
3284 Constant = isTypeConstant(MaterializedType, /*ExcludeCtor*/Value);
3285 Type = InitialValue->getType();
3286 } else {
3287 // No initializer, the initialization will be provided when we
3288 // initialize the declaration which performed lifetime extension.
3289 Type = getTypes().ConvertTypeForMem(MaterializedType);
3290 }
3291
3292 // Create a global variable for this lifetime-extended temporary.
3293 llvm::GlobalValue::LinkageTypes Linkage =
3294 getLLVMLinkageVarDefinition(VD, Constant);
3295 if (Linkage == llvm::GlobalVariable::ExternalLinkage) {
3296 const VarDecl *InitVD;
3297 if (VD->isStaticDataMember() && VD->getAnyInitializer(InitVD) &&
3298 isa<CXXRecordDecl>(InitVD->getLexicalDeclContext())) {
3299 // Temporaries defined inside a class get linkonce_odr linkage because the
3300 // class can be defined in multipe translation units.
3301 Linkage = llvm::GlobalVariable::LinkOnceODRLinkage;
3302 } else {
3303 // There is no need for this temporary to have external linkage if the
3304 // VarDecl has external linkage.
3305 Linkage = llvm::GlobalVariable::InternalLinkage;
3306 }
3307 }
3308 unsigned AddrSpace = GetGlobalVarAddressSpace(
3309 VD, getContext().getTargetAddressSpace(MaterializedType));
3310 auto *GV = new llvm::GlobalVariable(
3311 getModule(), Type, Constant, Linkage, InitialValue, Name.c_str(),
3312 /*InsertBefore=*/nullptr, llvm::GlobalVariable::NotThreadLocal,
3313 AddrSpace);
3314 setGlobalVisibility(GV, VD);
3315 GV->setAlignment(Align.getQuantity());
3316 if (supportsCOMDAT() && GV->isWeakForLinker())
3317 GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
3318 if (VD->getTLSKind())
3319 setTLSMode(GV, *VD);
3320 MaterializedGlobalTemporaryMap[E] = GV;
3321 return ConstantAddress(GV, Align);
3322}
3323
3324/// EmitObjCPropertyImplementations - Emit information for synthesized
3325/// properties for an implementation.
3326void CodeGenModule::EmitObjCPropertyImplementations(const
3327 ObjCImplementationDecl *D) {
3328 for (const auto *PID : D->property_impls()) {
3329 // Dynamic is just for type-checking.
3330 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) {
3331 ObjCPropertyDecl *PD = PID->getPropertyDecl();
3332
3333 // Determine which methods need to be implemented, some may have
3334 // been overridden. Note that ::isPropertyAccessor is not the method
3335 // we want, that just indicates if the decl came from a
3336 // property. What we want to know is if the method is defined in
3337 // this implementation.
3338 if (!D->getInstanceMethod(PD->getGetterName()))
3339 CodeGenFunction(*this).GenerateObjCGetter(
3340 const_cast<ObjCImplementationDecl *>(D), PID);
3341 if (!PD->isReadOnly() &&
3342 !D->getInstanceMethod(PD->getSetterName()))
3343 CodeGenFunction(*this).GenerateObjCSetter(
3344 const_cast<ObjCImplementationDecl *>(D), PID);
3345 }
3346 }
3347}
3348
3349static bool needsDestructMethod(ObjCImplementationDecl *impl) {
3350 const ObjCInterfaceDecl *iface = impl->getClassInterface();
3351 for (const ObjCIvarDecl *ivar = iface->all_declared_ivar_begin();
3352 ivar; ivar = ivar->getNextIvar())
3353 if (ivar->getType().isDestructedType())
3354 return true;
3355
3356 return false;
3357}
3358
3359static bool AllTrivialInitializers(CodeGenModule &CGM,
3360 ObjCImplementationDecl *D) {
3361 CodeGenFunction CGF(CGM);
3362 for (ObjCImplementationDecl::init_iterator B = D->init_begin(),
3363 E = D->init_end(); B != E; ++B) {
3364 CXXCtorInitializer *CtorInitExp = *B;
3365 Expr *Init = CtorInitExp->getInit();
3366 if (!CGF.isTrivialInitializer(Init))
3367 return false;
3368 }
3369 return true;
3370}
3371
3372/// EmitObjCIvarInitializations - Emit information for ivar initialization
3373/// for an implementation.
3374void CodeGenModule::EmitObjCIvarInitializations(ObjCImplementationDecl *D) {
3375 // We might need a .cxx_destruct even if we don't have any ivar initializers.
3376 if (needsDestructMethod(D)) {
3377 IdentifierInfo *II = &getContext().Idents.get(".cxx_destruct");
3378 Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
3379 ObjCMethodDecl *DTORMethod =
3380 ObjCMethodDecl::Create(getContext(), D->getLocation(), D->getLocation(),
3381 cxxSelector, getContext().VoidTy, nullptr, D,
3382 /*isInstance=*/true, /*isVariadic=*/false,
3383 /*isPropertyAccessor=*/true, /*isImplicitlyDeclared=*/true,
3384 /*isDefined=*/false, ObjCMethodDecl::Required);
3385 D->addInstanceMethod(DTORMethod);
3386 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, DTORMethod, false);
3387 D->setHasDestructors(true);
3388 }
3389
3390 // If the implementation doesn't have any ivar initializers, we don't need
3391 // a .cxx_construct.
3392 if (D->getNumIvarInitializers() == 0 ||
3393 AllTrivialInitializers(*this, D))
3394 return;
3395
3396 IdentifierInfo *II = &getContext().Idents.get(".cxx_construct");
3397 Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
3398 // The constructor returns 'self'.
3399 ObjCMethodDecl *CTORMethod = ObjCMethodDecl::Create(getContext(),
3400 D->getLocation(),
3401 D->getLocation(),
3402 cxxSelector,
3403 getContext().getObjCIdType(),
3404 nullptr, D, /*isInstance=*/true,
3405 /*isVariadic=*/false,
3406 /*isPropertyAccessor=*/true,
3407 /*isImplicitlyDeclared=*/true,
3408 /*isDefined=*/false,
3409 ObjCMethodDecl::Required);
3410 D->addInstanceMethod(CTORMethod);
3411 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, CTORMethod, true);
3412 D->setHasNonZeroConstructors(true);
3413}
3414
3415/// EmitNamespace - Emit all declarations in a namespace.
3416void CodeGenModule::EmitNamespace(const NamespaceDecl *ND) {
3417 for (auto *I : ND->decls()) {
3418 if (const auto *VD = dyn_cast<VarDecl>(I))
3419 if (VD->getTemplateSpecializationKind() != TSK_ExplicitSpecialization &&
3420 VD->getTemplateSpecializationKind() != TSK_Undeclared)
3421 continue;
3422 EmitTopLevelDecl(I);
3423 }
3424}
3425
3426// EmitLinkageSpec - Emit all declarations in a linkage spec.
3427void CodeGenModule::EmitLinkageSpec(const LinkageSpecDecl *LSD) {
3428 if (LSD->getLanguage() != LinkageSpecDecl::lang_c &&
3429 LSD->getLanguage() != LinkageSpecDecl::lang_cxx) {
3430 ErrorUnsupported(LSD, "linkage spec");
3431 return;
3432 }
3433
3434 for (auto *I : LSD->decls()) {
3435 // Meta-data for ObjC class includes references to implemented methods.
3436 // Generate class's method definitions first.
3437 if (auto *OID = dyn_cast<ObjCImplDecl>(I)) {
3438 for (auto *M : OID->methods())
3439 EmitTopLevelDecl(M);
3440 }
3441 EmitTopLevelDecl(I);
3442 }
3443}
3444
3445/// EmitTopLevelDecl - Emit code for a single top level declaration.
3446void CodeGenModule::EmitTopLevelDecl(Decl *D) {
3447 // Ignore dependent declarations.
3448 if (D->getDeclContext() && D->getDeclContext()->isDependentContext())
3449 return;
3450
3451 switch (D->getKind()) {
3452 case Decl::CXXConversion:
3453 case Decl::CXXMethod:
3454 case Decl::Function:
3455 // Skip function templates
3456 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() ||
3457 cast<FunctionDecl>(D)->isLateTemplateParsed())
3458 return;
3459
3460 EmitGlobal(cast<FunctionDecl>(D));
3461 // Always provide some coverage mapping
3462 // even for the functions that aren't emitted.
3463 AddDeferredUnusedCoverageMapping(D);
3464 break;
3465
3466 case Decl::Var:
3467 // Skip variable templates
3468 if (cast<VarDecl>(D)->getDescribedVarTemplate())
3469 return;
3470 case Decl::VarTemplateSpecialization:
3471 EmitGlobal(cast<VarDecl>(D));
3472 break;
3473
3474 // Indirect fields from global anonymous structs and unions can be
3475 // ignored; only the actual variable requires IR gen support.
3476 case Decl::IndirectField:
3477 break;
3478
3479 // C++ Decls
3480 case Decl::Namespace:
3481 EmitNamespace(cast<NamespaceDecl>(D));
3482 break;
3483 // No code generation needed.
3484 case Decl::UsingShadow:
3485 case Decl::ClassTemplate:
3486 case Decl::VarTemplate:
3487 case Decl::VarTemplatePartialSpecialization:
3488 case Decl::FunctionTemplate:
3489 case Decl::TypeAliasTemplate:
3490 case Decl::Block:
3491 case Decl::Empty:
3492 break;
3493 case Decl::Using: // using X; [C++]
3494 if (CGDebugInfo *DI = getModuleDebugInfo())
3495 DI->EmitUsingDecl(cast<UsingDecl>(*D));
3496 return;
3497 case Decl::NamespaceAlias:
3498 if (CGDebugInfo *DI = getModuleDebugInfo())
3499 DI->EmitNamespaceAlias(cast<NamespaceAliasDecl>(*D));
3500 return;
3501 case Decl::UsingDirective: // using namespace X; [C++]
3502 if (CGDebugInfo *DI = getModuleDebugInfo())
3503 DI->EmitUsingDirective(cast<UsingDirectiveDecl>(*D));
3504 return;
3505 case Decl::CXXConstructor:
3506 // Skip function templates
3507 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() ||
3508 cast<FunctionDecl>(D)->isLateTemplateParsed())
3509 return;
3510
3511 getCXXABI().EmitCXXConstructors(cast<CXXConstructorDecl>(D));
3512 break;
3513 case Decl::CXXDestructor:
3514 if (cast<FunctionDecl>(D)->isLateTemplateParsed())
3515 return;
3516 getCXXABI().EmitCXXDestructors(cast<CXXDestructorDecl>(D));
3517 break;
3518
3519 case Decl::StaticAssert:
3520 // Nothing to do.
3521 break;
3522
3523 // Objective-C Decls
3524
3525 // Forward declarations, no (immediate) code generation.
3526 case Decl::ObjCInterface:
3527 case Decl::ObjCCategory:
3528 break;
3529
3530 case Decl::ObjCProtocol: {
3531 auto *Proto = cast<ObjCProtocolDecl>(D);
3532 if (Proto->isThisDeclarationADefinition())
3533 ObjCRuntime->GenerateProtocol(Proto);
3534 break;
3535 }
3536
3537 case Decl::ObjCCategoryImpl:
3538 // Categories have properties but don't support synthesize so we
3539 // can ignore them here.
3540 ObjCRuntime->GenerateCategory(cast<ObjCCategoryImplDecl>(D));
3541 break;
3542
3543 case Decl::ObjCImplementation: {
3544 auto *OMD = cast<ObjCImplementationDecl>(D);
3545 EmitObjCPropertyImplementations(OMD);
3546 EmitObjCIvarInitializations(OMD);
3547 ObjCRuntime->GenerateClass(OMD);
3548 // Emit global variable debug information.
3549 if (CGDebugInfo *DI = getModuleDebugInfo())
3550 if (getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo)
3551 DI->getOrCreateInterfaceType(getContext().getObjCInterfaceType(
3552 OMD->getClassInterface()), OMD->getLocation());
3553 break;
3554 }
3555 case Decl::ObjCMethod: {
3556 auto *OMD = cast<ObjCMethodDecl>(D);
3557 // If this is not a prototype, emit the body.
3558 if (OMD->getBody())
3559 CodeGenFunction(*this).GenerateObjCMethod(OMD);
3560 break;
3561 }
3562 case Decl::ObjCCompatibleAlias:
3563 ObjCRuntime->RegisterAlias(cast<ObjCCompatibleAliasDecl>(D));
3564 break;
3565
3566 case Decl::LinkageSpec:
3567 EmitLinkageSpec(cast<LinkageSpecDecl>(D));
3568 break;
3569
3570 case Decl::FileScopeAsm: {
3571 // File-scope asm is ignored during device-side CUDA compilation.
3572 if (LangOpts.CUDA && LangOpts.CUDAIsDevice)
3573 break;
3574 auto *AD = cast<FileScopeAsmDecl>(D);
3575 getModule().appendModuleInlineAsm(AD->getAsmString()->getString());
3576 break;
3577 }
3578
3579 case Decl::Import: {
3580 auto *Import = cast<ImportDecl>(D);
3581
3582 // Ignore import declarations that come from imported modules.
3583 if (Import->getImportedOwningModule())
3584 break;
3585 if (CGDebugInfo *DI = getModuleDebugInfo())
3586 DI->EmitImportDecl(*Import);
3587
3588 ImportedModules.insert(Import->getImportedModule());
3589 break;
3590 }
3591
3592 case Decl::OMPThreadPrivate:
3593 EmitOMPThreadPrivateDecl(cast<OMPThreadPrivateDecl>(D));
3594 break;
3595
3596 case Decl::ClassTemplateSpecialization: {
3597 const auto *Spec = cast<ClassTemplateSpecializationDecl>(D);
3598 if (DebugInfo &&
3599 Spec->getSpecializationKind() == TSK_ExplicitInstantiationDefinition &&
3600 Spec->hasDefinition())
3601 DebugInfo->completeTemplateDefinition(*Spec);
3602 break;
3603 }
3604
3605 default:
3606 // Make sure we handled everything we should, every other kind is a
3607 // non-top-level decl. FIXME: Would be nice to have an isTopLevelDeclKind
3608 // function. Need to recode Decl::Kind to do that easily.
3609 assert(isa<TypeDecl>(D) && "Unsupported decl kind")((isa<TypeDecl>(D) && "Unsupported decl kind") ?
static_cast<void> (0) : __assert_fail ("isa<TypeDecl>(D) && \"Unsupported decl kind\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 3609, __PRETTY_FUNCTION__))
;
3610 break;
3611 }
3612}
3613
3614void CodeGenModule::AddDeferredUnusedCoverageMapping(Decl *D) {
3615 // Do we need to generate coverage mapping?
3616 if (!CodeGenOpts.CoverageMapping)
3617 return;
3618 switch (D->getKind()) {
3619 case Decl::CXXConversion:
3620 case Decl::CXXMethod:
3621 case Decl::Function:
3622 case Decl::ObjCMethod:
3623 case Decl::CXXConstructor:
3624 case Decl::CXXDestructor: {
3625 if (!cast<FunctionDecl>(D)->doesThisDeclarationHaveABody())
3626 return;
3627 auto I = DeferredEmptyCoverageMappingDecls.find(D);
3628 if (I == DeferredEmptyCoverageMappingDecls.end())
3629 DeferredEmptyCoverageMappingDecls[D] = true;
3630 break;
3631 }
3632 default:
3633 break;
3634 };
3635}
3636
3637void CodeGenModule::ClearUnusedCoverageMapping(const Decl *D) {
3638 // Do we need to generate coverage mapping?
3639 if (!CodeGenOpts.CoverageMapping)
3640 return;
3641 if (const auto *Fn = dyn_cast<FunctionDecl>(D)) {
3642 if (Fn->isTemplateInstantiation())
3643 ClearUnusedCoverageMapping(Fn->getTemplateInstantiationPattern());
3644 }
3645 auto I = DeferredEmptyCoverageMappingDecls.find(D);
3646 if (I == DeferredEmptyCoverageMappingDecls.end())
3647 DeferredEmptyCoverageMappingDecls[D] = false;
3648 else
3649 I->second = false;
3650}
3651
3652void CodeGenModule::EmitDeferredUnusedCoverageMappings() {
3653 std::vector<const Decl *> DeferredDecls;
3654 for (const auto &I : DeferredEmptyCoverageMappingDecls) {
3655 if (!I.second)
3656 continue;
3657 DeferredDecls.push_back(I.first);
3658 }
3659 // Sort the declarations by their location to make sure that the tests get a
3660 // predictable order for the coverage mapping for the unused declarations.
3661 if (CodeGenOpts.DumpCoverageMapping)
3662 std::sort(DeferredDecls.begin(), DeferredDecls.end(),
3663 [] (const Decl *LHS, const Decl *RHS) {
3664 return LHS->getLocStart() < RHS->getLocStart();
3665 });
3666 for (const auto *D : DeferredDecls) {
3667 switch (D->getKind()) {
3668 case Decl::CXXConversion:
3669 case Decl::CXXMethod:
3670 case Decl::Function:
3671 case Decl::ObjCMethod: {
3672 CodeGenPGO PGO(*this);
3673 GlobalDecl GD(cast<FunctionDecl>(D));
3674 PGO.emitEmptyCounterMapping(D, getMangledName(GD),
3675 getFunctionLinkage(GD));
3676 break;
3677 }
3678 case Decl::CXXConstructor: {
3679 CodeGenPGO PGO(*this);
3680 GlobalDecl GD(cast<CXXConstructorDecl>(D), Ctor_Base);
3681 PGO.emitEmptyCounterMapping(D, getMangledName(GD),
3682 getFunctionLinkage(GD));
3683 break;
3684 }
3685 case Decl::CXXDestructor: {
3686 CodeGenPGO PGO(*this);
3687 GlobalDecl GD(cast<CXXDestructorDecl>(D), Dtor_Base);
3688 PGO.emitEmptyCounterMapping(D, getMangledName(GD),
3689 getFunctionLinkage(GD));
3690 break;
3691 }
3692 default:
3693 break;
3694 };
3695 }
3696}
3697
3698/// Turns the given pointer into a constant.
3699static llvm::Constant *GetPointerConstant(llvm::LLVMContext &Context,
3700 const void *Ptr) {
3701 uintptr_t PtrInt = reinterpret_cast<uintptr_t>(Ptr);
3702 llvm::Type *i64 = llvm::Type::getInt64Ty(Context);
3703 return llvm::ConstantInt::get(i64, PtrInt);
3704}
3705
3706static void EmitGlobalDeclMetadata(CodeGenModule &CGM,
3707 llvm::NamedMDNode *&GlobalMetadata,
3708 GlobalDecl D,
3709 llvm::GlobalValue *Addr) {
3710 if (!GlobalMetadata)
3711 GlobalMetadata =
3712 CGM.getModule().getOrInsertNamedMetadata("clang.global.decl.ptrs");
3713
3714 // TODO: should we report variant information for ctors/dtors?
3715 llvm::Metadata *Ops[] = {llvm::ConstantAsMetadata::get(Addr),
3716 llvm::ConstantAsMetadata::get(GetPointerConstant(
3717 CGM.getLLVMContext(), D.getDecl()))};
3718 GlobalMetadata->addOperand(llvm::MDNode::get(CGM.getLLVMContext(), Ops));
3719}
3720
3721/// For each function which is declared within an extern "C" region and marked
3722/// as 'used', but has internal linkage, create an alias from the unmangled
3723/// name to the mangled name if possible. People expect to be able to refer
3724/// to such functions with an unmangled name from inline assembly within the
3725/// same translation unit.
3726void CodeGenModule::EmitStaticExternCAliases() {
3727 for (auto &I : StaticExternCValues) {
3728 IdentifierInfo *Name = I.first;
3729 llvm::GlobalValue *Val = I.second;
3730 if (Val && !getModule().getNamedValue(Name->getName()))
3731 addUsedGlobal(llvm::GlobalAlias::create(Name->getName(), Val));
3732 }
3733}
3734
3735bool CodeGenModule::lookupRepresentativeDecl(StringRef MangledName,
3736 GlobalDecl &Result) const {
3737 auto Res = Manglings.find(MangledName);
3738 if (Res == Manglings.end())
3739 return false;
3740 Result = Res->getValue();
3741 return true;
3742}
3743
3744/// Emits metadata nodes associating all the global values in the
3745/// current module with the Decls they came from. This is useful for
3746/// projects using IR gen as a subroutine.
3747///
3748/// Since there's currently no way to associate an MDNode directly
3749/// with an llvm::GlobalValue, we create a global named metadata
3750/// with the name 'clang.global.decl.ptrs'.
3751void CodeGenModule::EmitDeclMetadata() {
3752 llvm::NamedMDNode *GlobalMetadata = nullptr;
3753
3754 for (auto &I : MangledDeclNames) {
3755 llvm::GlobalValue *Addr = getModule().getNamedValue(I.second);
3756 // Some mangled names don't necessarily have an associated GlobalValue
3757 // in this module, e.g. if we mangled it for DebugInfo.
3758 if (Addr)
3759 EmitGlobalDeclMetadata(*this, GlobalMetadata, I.first, Addr);
3760 }
3761}
3762
3763/// Emits metadata nodes for all the local variables in the current
3764/// function.
3765void CodeGenFunction::EmitDeclMetadata() {
3766 if (LocalDeclMap.empty()) return;
3767
3768 llvm::LLVMContext &Context = getLLVMContext();
3769
3770 // Find the unique metadata ID for this name.
3771 unsigned DeclPtrKind = Context.getMDKindID("clang.decl.ptr");
3772
3773 llvm::NamedMDNode *GlobalMetadata = nullptr;
3774
3775 for (auto &I : LocalDeclMap) {
3776 const Decl *D = I.first;
3777 llvm::Value *Addr = I.second.getPointer();
3778 if (auto *Alloca = dyn_cast<llvm::AllocaInst>(Addr)) {
3779 llvm::Value *DAddr = GetPointerConstant(getLLVMContext(), D);
3780 Alloca->setMetadata(
3781 DeclPtrKind, llvm::MDNode::get(
3782 Context, llvm::ValueAsMetadata::getConstant(DAddr)));
3783 } else if (auto *GV = dyn_cast<llvm::GlobalValue>(Addr)) {
3784 GlobalDecl GD = GlobalDecl(cast<VarDecl>(D));
3785 EmitGlobalDeclMetadata(CGM, GlobalMetadata, GD, GV);
3786 }
3787 }
3788}
3789
3790void CodeGenModule::EmitVersionIdentMetadata() {
3791 llvm::NamedMDNode *IdentMetadata =
3792 TheModule.getOrInsertNamedMetadata("llvm.ident");
3793 std::string Version = getClangFullVersion();
3794 llvm::LLVMContext &Ctx = TheModule.getContext();
3795
3796 llvm::Metadata *IdentNode[] = {llvm::MDString::get(Ctx, Version)};
3797 IdentMetadata->addOperand(llvm::MDNode::get(Ctx, IdentNode));
3798}
3799
3800void CodeGenModule::EmitTargetMetadata() {
3801 // Warning, new MangledDeclNames may be appended within this loop.
3802 // We rely on MapVector insertions adding new elements to the end
3803 // of the container.
3804 // FIXME: Move this loop into the one target that needs it, and only
3805 // loop over those declarations for which we couldn't emit the target
3806 // metadata when we emitted the declaration.
3807 for (unsigned I = 0; I != MangledDeclNames.size(); ++I) {
3808 auto Val = *(MangledDeclNames.begin() + I);
3809 const Decl *D = Val.first.getDecl()->getMostRecentDecl();
3810 llvm::GlobalValue *GV = GetGlobalValue(Val.second);
3811 getTargetCodeGenInfo().emitTargetMD(D, GV, *this);
3812 }
3813}
3814
3815void CodeGenModule::EmitCoverageFile() {
3816 if (!getCodeGenOpts().CoverageFile.empty()) {
3817 if (llvm::NamedMDNode *CUNode = TheModule.getNamedMetadata("llvm.dbg.cu")) {
3818 llvm::NamedMDNode *GCov = TheModule.getOrInsertNamedMetadata("llvm.gcov");
3819 llvm::LLVMContext &Ctx = TheModule.getContext();
3820 llvm::MDString *CoverageFile =
3821 llvm::MDString::get(Ctx, getCodeGenOpts().CoverageFile);
3822 for (int i = 0, e = CUNode->getNumOperands(); i != e; ++i) {
3823 llvm::MDNode *CU = CUNode->getOperand(i);
3824 llvm::Metadata *Elts[] = {CoverageFile, CU};
3825 GCov->addOperand(llvm::MDNode::get(Ctx, Elts));
3826 }
3827 }
3828 }
3829}
3830
3831llvm::Constant *CodeGenModule::EmitUuidofInitializer(StringRef Uuid) {
3832 // Sema has checked that all uuid strings are of the form
3833 // "12345678-1234-1234-1234-1234567890ab".
3834 assert(Uuid.size() == 36)((Uuid.size() == 36) ? static_cast<void> (0) : __assert_fail
("Uuid.size() == 36", "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 3834, __PRETTY_FUNCTION__))
;
3835 for (unsigned i = 0; i < 36; ++i) {
3836 if (i == 8 || i == 13 || i == 18 || i == 23) assert(Uuid[i] == '-')((Uuid[i] == '-') ? static_cast<void> (0) : __assert_fail
("Uuid[i] == '-'", "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 3836, __PRETTY_FUNCTION__))
;
3837 else assert(isHexDigit(Uuid[i]))((isHexDigit(Uuid[i])) ? static_cast<void> (0) : __assert_fail
("isHexDigit(Uuid[i])", "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn254766/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 3837, __PRETTY_FUNCTION__))
;
3838 }
3839
3840 // The starts of all bytes of Field3 in Uuid. Field 3 is "1234-1234567890ab".
3841 const unsigned Field3ValueOffsets[8] = { 19, 21, 24, 26, 28, 30, 32, 34 };
3842
3843 llvm::Constant *Field3[8];
3844 for (unsigned Idx = 0; Idx < 8; ++Idx)
3845 Field3[Idx] = llvm::ConstantInt::get(
3846 Int8Ty, Uuid.substr(Field3ValueOffsets[Idx], 2), 16);
3847
3848 llvm::Constant *Fields[4] = {
3849 llvm::ConstantInt::get(Int32Ty, Uuid.substr(0, 8), 16),
3850 llvm::ConstantInt::get(Int16Ty, Uuid.substr(9, 4), 16),
3851 llvm::ConstantInt::get(Int16Ty, Uuid.substr(14, 4), 16),
3852 llvm::ConstantArray::get(llvm::ArrayType::get(Int8Ty, 8), Field3)
3853 };
3854
3855 return llvm::ConstantStruct::getAnon(Fields);
3856}
3857
3858llvm::Constant *CodeGenModule::GetAddrOfRTTIDescriptor(QualType Ty,
3859 bool ForEH) {
3860 // Return a bogus pointer if RTTI is disabled, unless it's for EH.
3861 // FIXME: should we even be calling this method if RTTI is disabled
3862 // and it's not for EH?
3863 if (!ForEH && !getLangOpts().RTTI)
3864 return llvm::Constant::getNullValue(Int8PtrTy);
3865
3866 if (ForEH && Ty->isObjCObjectPointerType() &&
3867 LangOpts.ObjCRuntime.isGNUFamily())
3868 return ObjCRuntime->GetEHType(Ty);
3869
3870 return getCXXABI().getAddrOfRTTIDescriptor(Ty);
3871}
3872
3873void CodeGenModule::EmitOMPThreadPrivateDecl(const OMPThreadPrivateDecl *D) {
3874 for (auto RefExpr : D->varlists()) {
3875 auto *VD = cast<VarDecl>(cast<DeclRefExpr>(RefExpr)->getDecl());
3876 bool PerformInit =
3877 VD->getAnyInitializer() &&
3878 !VD->getAnyInitializer()->isConstantInitializer(getContext(),
3879 /*ForRef=*/false);
3880
3881 Address Addr(GetAddrOfGlobalVar(VD), getContext().getDeclAlign(VD));
3882 if (auto InitFunction = getOpenMPRuntime().emitThreadPrivateVarDefinition(
3883 VD, Addr, RefExpr->getLocStart(), PerformInit))
3884 CXXGlobalInits.push_back(InitFunction);
3885 }
3886}
3887
3888llvm::Metadata *CodeGenModule::CreateMetadataIdentifierForType(QualType T) {
3889 llvm::Metadata *&InternalId = MetadataIdMap[T.getCanonicalType()];
3890 if (InternalId)
3891 return InternalId;
3892
3893 if (isExternallyVisible(T->getLinkage())) {
3894 std::string OutName;
3895 llvm::raw_string_ostream Out(OutName);
3896 getCXXABI().getMangleContext().mangleTypeName(T, Out);
3897
3898 InternalId = llvm::MDString::get(getLLVMContext(), Out.str());
3899 } else {
3900 InternalId = llvm::MDNode::getDistinct(getLLVMContext(),
3901 llvm::ArrayRef<llvm::Metadata *>());
3902 }
3903
3904 return InternalId;
3905}
3906
3907llvm::MDTuple *CodeGenModule::CreateVTableBitSetEntry(
3908 llvm::GlobalVariable *VTable, CharUnits Offset, const CXXRecordDecl *RD) {
3909 llvm::Metadata *BitsetOps[] = {
3910 CreateMetadataIdentifierForType(QualType(RD->getTypeForDecl(), 0)),
3911 llvm::ConstantAsMetadata::get(VTable),
3912 llvm::ConstantAsMetadata::get(
3913 llvm::ConstantInt::get(Int64Ty, Offset.getQuantity()))};
3914 return llvm::MDTuple::get(getLLVMContext(), BitsetOps);
3915}
3916
3917// Fills in the supplied string map with the set of target features for the
3918// passed in function.
3919void CodeGenModule::getFunctionFeatureMap(llvm::StringMap<bool> &FeatureMap,
3920 const FunctionDecl *FD) {
3921 StringRef TargetCPU = Target.getTargetOpts().CPU;
3922 if (const auto *TD = FD->getAttr<TargetAttr>()) {
3923 // If we have a TargetAttr build up the feature map based on that.
3924 TargetAttr::ParsedTargetAttr ParsedAttr = TD->parse();
3925
3926 // Make a copy of the features as passed on the command line into the
3927 // beginning of the additional features from the function to override.
3928 ParsedAttr.first.insert(ParsedAttr.first.begin(),
3929 Target.getTargetOpts().FeaturesAsWritten.begin(),
3930 Target.getTargetOpts().FeaturesAsWritten.end());
3931
3932 if (ParsedAttr.second != "")
3933 TargetCPU = ParsedAttr.second;
3934
3935 // Now populate the feature map, first with the TargetCPU which is either
3936 // the default or a new one from the target attribute string. Then we'll use
3937 // the passed in features (FeaturesAsWritten) along with the new ones from
3938 // the attribute.
3939 Target.initFeatureMap(FeatureMap, getDiags(), TargetCPU, ParsedAttr.first);
3940 } else {
3941 Target.initFeatureMap(FeatureMap, getDiags(), TargetCPU,
3942 Target.getTargetOpts().Features);
3943 }
3944}