Bug Summary

File:tools/clang/lib/CodeGen/CodeGenModule.cpp
Warning:line 4186, column 7
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name CodeGenModule.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-eagerly-assume -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -mrelocation-model pic -pic-level 2 -mthread-model posix -relaxed-aliasing -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-7/lib/clang/7.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-7~svn326246/build-llvm/tools/clang/lib/CodeGen -I /build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen -I /build/llvm-toolchain-snapshot-7~svn326246/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn326246/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn326246/build-llvm/include -I /build/llvm-toolchain-snapshot-7~svn326246/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0/backward -internal-isystem /usr/include/clang/7.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-7/lib/clang/7.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++11 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-7~svn326246/build-llvm/tools/clang/lib/CodeGen -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-checker optin.performance.Padding -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2018-02-28-041547-14988-1 -x c++ /build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp

/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp

1//===--- CodeGenModule.cpp - Emit LLVM Code from ASTs for a Module --------===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This coordinates the per-module state used while generating code.
11//
12//===----------------------------------------------------------------------===//
13
14#include "CodeGenModule.h"
15#include "CGBlocks.h"
16#include "CGCUDARuntime.h"
17#include "CGCXXABI.h"
18#include "CGCall.h"
19#include "CGDebugInfo.h"
20#include "CGObjCRuntime.h"
21#include "CGOpenCLRuntime.h"
22#include "CGOpenMPRuntime.h"
23#include "CGOpenMPRuntimeNVPTX.h"
24#include "CodeGenFunction.h"
25#include "CodeGenPGO.h"
26#include "ConstantEmitter.h"
27#include "CoverageMappingGen.h"
28#include "TargetInfo.h"
29#include "clang/AST/ASTContext.h"
30#include "clang/AST/CharUnits.h"
31#include "clang/AST/DeclCXX.h"
32#include "clang/AST/DeclObjC.h"
33#include "clang/AST/DeclTemplate.h"
34#include "clang/AST/Mangle.h"
35#include "clang/AST/RecordLayout.h"
36#include "clang/AST/RecursiveASTVisitor.h"
37#include "clang/Basic/Builtins.h"
38#include "clang/Basic/CharInfo.h"
39#include "clang/Basic/Diagnostic.h"
40#include "clang/Basic/Module.h"
41#include "clang/Basic/SourceManager.h"
42#include "clang/Basic/TargetInfo.h"
43#include "clang/Basic/Version.h"
44#include "clang/CodeGen/ConstantInitBuilder.h"
45#include "clang/Frontend/CodeGenOptions.h"
46#include "clang/Sema/SemaDiagnostic.h"
47#include "llvm/ADT/Triple.h"
48#include "llvm/Analysis/TargetLibraryInfo.h"
49#include "llvm/IR/CallSite.h"
50#include "llvm/IR/CallingConv.h"
51#include "llvm/IR/DataLayout.h"
52#include "llvm/IR/Intrinsics.h"
53#include "llvm/IR/LLVMContext.h"
54#include "llvm/IR/Module.h"
55#include "llvm/ProfileData/InstrProfReader.h"
56#include "llvm/Support/ConvertUTF.h"
57#include "llvm/Support/ErrorHandling.h"
58#include "llvm/Support/MD5.h"
59
60using namespace clang;
61using namespace CodeGen;
62
63static llvm::cl::opt<bool> LimitedCoverage(
64 "limited-coverage-experimental", llvm::cl::ZeroOrMore, llvm::cl::Hidden,
65 llvm::cl::desc("Emit limited coverage mapping information (experimental)"),
66 llvm::cl::init(false));
67
68static const char AnnotationSection[] = "llvm.metadata";
69
70static CGCXXABI *createCXXABI(CodeGenModule &CGM) {
71 switch (CGM.getTarget().getCXXABI().getKind()) {
72 case TargetCXXABI::GenericAArch64:
73 case TargetCXXABI::GenericARM:
74 case TargetCXXABI::iOS:
75 case TargetCXXABI::iOS64:
76 case TargetCXXABI::WatchOS:
77 case TargetCXXABI::GenericMIPS:
78 case TargetCXXABI::GenericItanium:
79 case TargetCXXABI::WebAssembly:
80 return CreateItaniumCXXABI(CGM);
81 case TargetCXXABI::Microsoft:
82 return CreateMicrosoftCXXABI(CGM);
83 }
84
85 llvm_unreachable("invalid C++ ABI kind")::llvm::llvm_unreachable_internal("invalid C++ ABI kind", "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 85)
;
86}
87
88CodeGenModule::CodeGenModule(ASTContext &C, const HeaderSearchOptions &HSO,
89 const PreprocessorOptions &PPO,
90 const CodeGenOptions &CGO, llvm::Module &M,
91 DiagnosticsEngine &diags,
92 CoverageSourceInfo *CoverageInfo)
93 : Context(C), LangOpts(C.getLangOpts()), HeaderSearchOpts(HSO),
94 PreprocessorOpts(PPO), CodeGenOpts(CGO), TheModule(M), Diags(diags),
95 Target(C.getTargetInfo()), ABI(createCXXABI(*this)),
96 VMContext(M.getContext()), Types(*this), VTables(*this),
97 SanitizerMD(new SanitizerMetadata(*this)) {
98
99 // Initialize the type cache.
100 llvm::LLVMContext &LLVMContext = M.getContext();
101 VoidTy = llvm::Type::getVoidTy(LLVMContext);
102 Int8Ty = llvm::Type::getInt8Ty(LLVMContext);
103 Int16Ty = llvm::Type::getInt16Ty(LLVMContext);
104 Int32Ty = llvm::Type::getInt32Ty(LLVMContext);
105 Int64Ty = llvm::Type::getInt64Ty(LLVMContext);
106 HalfTy = llvm::Type::getHalfTy(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 SizeSizeInBytes =
113 C.toCharUnitsFromBits(C.getTargetInfo().getMaxPointerWidth()).getQuantity();
114 IntAlignInBytes =
115 C.toCharUnitsFromBits(C.getTargetInfo().getIntAlign()).getQuantity();
116 IntTy = llvm::IntegerType::get(LLVMContext, C.getTargetInfo().getIntWidth());
117 IntPtrTy = llvm::IntegerType::get(LLVMContext,
118 C.getTargetInfo().getMaxPointerWidth());
119 Int8PtrTy = Int8Ty->getPointerTo(0);
120 Int8PtrPtrTy = Int8PtrTy->getPointerTo(0);
121 AllocaInt8PtrTy = Int8Ty->getPointerTo(
122 M.getDataLayout().getAllocaAddrSpace());
123 ASTAllocaAddressSpace = getTargetCodeGenInfo().getASTAllocaAddressSpace();
124
125 RuntimeCC = getTargetCodeGenInfo().getABIInfo().getRuntimeCC();
126 BuiltinCC = getTargetCodeGenInfo().getABIInfo().getBuiltinCC();
127
128 if (LangOpts.ObjC1)
129 createObjCRuntime();
130 if (LangOpts.OpenCL)
131 createOpenCLRuntime();
132 if (LangOpts.OpenMP)
133 createOpenMPRuntime();
134 if (LangOpts.CUDA)
135 createCUDARuntime();
136
137 // Enable TBAA unless it's suppressed. ThreadSanitizer needs TBAA even at O0.
138 if (LangOpts.Sanitize.has(SanitizerKind::Thread) ||
139 (!CodeGenOpts.RelaxedAliasing && CodeGenOpts.OptimizationLevel > 0))
140 TBAA.reset(new CodeGenTBAA(Context, TheModule, CodeGenOpts, getLangOpts(),
141 getCXXABI().getMangleContext()));
142
143 // If debug info or coverage generation is enabled, create the CGDebugInfo
144 // object.
145 if (CodeGenOpts.getDebugInfo() != codegenoptions::NoDebugInfo ||
146 CodeGenOpts.EmitGcovArcs || CodeGenOpts.EmitGcovNotes)
147 DebugInfo.reset(new CGDebugInfo(*this));
148
149 Block.GlobalUniqueCount = 0;
150
151 if (C.getLangOpts().ObjC1)
152 ObjCData.reset(new ObjCEntrypoints());
153
154 if (CodeGenOpts.hasProfileClangUse()) {
155 auto ReaderOrErr = llvm::IndexedInstrProfReader::create(
156 CodeGenOpts.ProfileInstrumentUsePath);
157 if (auto E = ReaderOrErr.takeError()) {
158 unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
159 "Could not read profile %0: %1");
160 llvm::handleAllErrors(std::move(E), [&](const llvm::ErrorInfoBase &EI) {
161 getDiags().Report(DiagID) << CodeGenOpts.ProfileInstrumentUsePath
162 << EI.message();
163 });
164 } else
165 PGOReader = std::move(ReaderOrErr.get());
166 }
167
168 // If coverage mapping generation is enabled, create the
169 // CoverageMappingModuleGen object.
170 if (CodeGenOpts.CoverageMapping)
171 CoverageMapping.reset(new CoverageMappingModuleGen(*this, *CoverageInfo));
172}
173
174CodeGenModule::~CodeGenModule() {}
175
176void CodeGenModule::createObjCRuntime() {
177 // This is just isGNUFamily(), but we want to force implementors of
178 // new ABIs to decide how best to do this.
179 switch (LangOpts.ObjCRuntime.getKind()) {
180 case ObjCRuntime::GNUstep:
181 case ObjCRuntime::GCC:
182 case ObjCRuntime::ObjFW:
183 ObjCRuntime.reset(CreateGNUObjCRuntime(*this));
184 return;
185
186 case ObjCRuntime::FragileMacOSX:
187 case ObjCRuntime::MacOSX:
188 case ObjCRuntime::iOS:
189 case ObjCRuntime::WatchOS:
190 ObjCRuntime.reset(CreateMacObjCRuntime(*this));
191 return;
192 }
193 llvm_unreachable("bad runtime kind")::llvm::llvm_unreachable_internal("bad runtime kind", "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 193)
;
194}
195
196void CodeGenModule::createOpenCLRuntime() {
197 OpenCLRuntime.reset(new CGOpenCLRuntime(*this));
198}
199
200void CodeGenModule::createOpenMPRuntime() {
201 // Select a specialized code generation class based on the target, if any.
202 // If it does not exist use the default implementation.
203 switch (getTriple().getArch()) {
204 case llvm::Triple::nvptx:
205 case llvm::Triple::nvptx64:
206 assert(getLangOpts().OpenMPIsDevice &&(static_cast <bool> (getLangOpts().OpenMPIsDevice &&
"OpenMP NVPTX is only prepared to deal with device code.") ?
void (0) : __assert_fail ("getLangOpts().OpenMPIsDevice && \"OpenMP NVPTX is only prepared to deal with device code.\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 207, __extension__ __PRETTY_FUNCTION__))
207 "OpenMP NVPTX is only prepared to deal with device code.")(static_cast <bool> (getLangOpts().OpenMPIsDevice &&
"OpenMP NVPTX is only prepared to deal with device code.") ?
void (0) : __assert_fail ("getLangOpts().OpenMPIsDevice && \"OpenMP NVPTX is only prepared to deal with device code.\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 207, __extension__ __PRETTY_FUNCTION__))
;
208 OpenMPRuntime.reset(new CGOpenMPRuntimeNVPTX(*this));
209 break;
210 default:
211 if (LangOpts.OpenMPSimd)
212 OpenMPRuntime.reset(new CGOpenMPSIMDRuntime(*this));
213 else
214 OpenMPRuntime.reset(new CGOpenMPRuntime(*this));
215 break;
216 }
217}
218
219void CodeGenModule::createCUDARuntime() {
220 CUDARuntime.reset(CreateNVCUDARuntime(*this));
221}
222
223void CodeGenModule::addReplacement(StringRef Name, llvm::Constant *C) {
224 Replacements[Name] = C;
225}
226
227void CodeGenModule::applyReplacements() {
228 for (auto &I : Replacements) {
229 StringRef MangledName = I.first();
230 llvm::Constant *Replacement = I.second;
231 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
232 if (!Entry)
233 continue;
234 auto *OldF = cast<llvm::Function>(Entry);
235 auto *NewF = dyn_cast<llvm::Function>(Replacement);
236 if (!NewF) {
237 if (auto *Alias = dyn_cast<llvm::GlobalAlias>(Replacement)) {
238 NewF = dyn_cast<llvm::Function>(Alias->getAliasee());
239 } else {
240 auto *CE = cast<llvm::ConstantExpr>(Replacement);
241 assert(CE->getOpcode() == llvm::Instruction::BitCast ||(static_cast <bool> (CE->getOpcode() == llvm::Instruction
::BitCast || CE->getOpcode() == llvm::Instruction::GetElementPtr
) ? void (0) : __assert_fail ("CE->getOpcode() == llvm::Instruction::BitCast || CE->getOpcode() == llvm::Instruction::GetElementPtr"
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 242, __extension__ __PRETTY_FUNCTION__))
242 CE->getOpcode() == llvm::Instruction::GetElementPtr)(static_cast <bool> (CE->getOpcode() == llvm::Instruction
::BitCast || CE->getOpcode() == llvm::Instruction::GetElementPtr
) ? void (0) : __assert_fail ("CE->getOpcode() == llvm::Instruction::BitCast || CE->getOpcode() == llvm::Instruction::GetElementPtr"
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 242, __extension__ __PRETTY_FUNCTION__))
;
243 NewF = dyn_cast<llvm::Function>(CE->getOperand(0));
244 }
245 }
246
247 // Replace old with new, but keep the old order.
248 OldF->replaceAllUsesWith(Replacement);
249 if (NewF) {
250 NewF->removeFromParent();
251 OldF->getParent()->getFunctionList().insertAfter(OldF->getIterator(),
252 NewF);
253 }
254 OldF->eraseFromParent();
255 }
256}
257
258void CodeGenModule::addGlobalValReplacement(llvm::GlobalValue *GV, llvm::Constant *C) {
259 GlobalValReplacements.push_back(std::make_pair(GV, C));
260}
261
262void CodeGenModule::applyGlobalValReplacements() {
263 for (auto &I : GlobalValReplacements) {
264 llvm::GlobalValue *GV = I.first;
265 llvm::Constant *C = I.second;
266
267 GV->replaceAllUsesWith(C);
268 GV->eraseFromParent();
269 }
270}
271
272// This is only used in aliases that we created and we know they have a
273// linear structure.
274static const llvm::GlobalObject *getAliasedGlobal(
275 const llvm::GlobalIndirectSymbol &GIS) {
276 llvm::SmallPtrSet<const llvm::GlobalIndirectSymbol*, 4> Visited;
277 const llvm::Constant *C = &GIS;
278 for (;;) {
279 C = C->stripPointerCasts();
280 if (auto *GO = dyn_cast<llvm::GlobalObject>(C))
281 return GO;
282 // stripPointerCasts will not walk over weak aliases.
283 auto *GIS2 = dyn_cast<llvm::GlobalIndirectSymbol>(C);
284 if (!GIS2)
285 return nullptr;
286 if (!Visited.insert(GIS2).second)
287 return nullptr;
288 C = GIS2->getIndirectSymbol();
289 }
290}
291
292void CodeGenModule::checkAliases() {
293 // Check if the constructed aliases are well formed. It is really unfortunate
294 // that we have to do this in CodeGen, but we only construct mangled names
295 // and aliases during codegen.
296 bool Error = false;
297 DiagnosticsEngine &Diags = getDiags();
298 for (const GlobalDecl &GD : Aliases) {
299 const auto *D = cast<ValueDecl>(GD.getDecl());
300 SourceLocation Location;
301 bool IsIFunc = D->hasAttr<IFuncAttr>();
302 if (const Attr *A = D->getDefiningAttr())
303 Location = A->getLocation();
304 else
305 llvm_unreachable("Not an alias or ifunc?")::llvm::llvm_unreachable_internal("Not an alias or ifunc?", "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 305)
;
306 StringRef MangledName = getMangledName(GD);
307 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
308 auto *Alias = cast<llvm::GlobalIndirectSymbol>(Entry);
309 const llvm::GlobalValue *GV = getAliasedGlobal(*Alias);
310 if (!GV) {
311 Error = true;
312 Diags.Report(Location, diag::err_cyclic_alias) << IsIFunc;
313 } else if (GV->isDeclaration()) {
314 Error = true;
315 Diags.Report(Location, diag::err_alias_to_undefined)
316 << IsIFunc << IsIFunc;
317 } else if (IsIFunc) {
318 // Check resolver function type.
319 llvm::FunctionType *FTy = dyn_cast<llvm::FunctionType>(
320 GV->getType()->getPointerElementType());
321 assert(FTy)(static_cast <bool> (FTy) ? void (0) : __assert_fail ("FTy"
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 321, __extension__ __PRETTY_FUNCTION__))
;
322 if (!FTy->getReturnType()->isPointerTy())
323 Diags.Report(Location, diag::err_ifunc_resolver_return);
324 if (FTy->getNumParams())
325 Diags.Report(Location, diag::err_ifunc_resolver_params);
326 }
327
328 llvm::Constant *Aliasee = Alias->getIndirectSymbol();
329 llvm::GlobalValue *AliaseeGV;
330 if (auto CE = dyn_cast<llvm::ConstantExpr>(Aliasee))
331 AliaseeGV = cast<llvm::GlobalValue>(CE->getOperand(0));
332 else
333 AliaseeGV = cast<llvm::GlobalValue>(Aliasee);
334
335 if (const SectionAttr *SA = D->getAttr<SectionAttr>()) {
336 StringRef AliasSection = SA->getName();
337 if (AliasSection != AliaseeGV->getSection())
338 Diags.Report(SA->getLocation(), diag::warn_alias_with_section)
339 << AliasSection << IsIFunc << IsIFunc;
340 }
341
342 // We have to handle alias to weak aliases in here. LLVM itself disallows
343 // this since the object semantics would not match the IL one. For
344 // compatibility with gcc we implement it by just pointing the alias
345 // to its aliasee's aliasee. We also warn, since the user is probably
346 // expecting the link to be weak.
347 if (auto GA = dyn_cast<llvm::GlobalIndirectSymbol>(AliaseeGV)) {
348 if (GA->isInterposable()) {
349 Diags.Report(Location, diag::warn_alias_to_weak_alias)
350 << GV->getName() << GA->getName() << IsIFunc;
351 Aliasee = llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(
352 GA->getIndirectSymbol(), Alias->getType());
353 Alias->setIndirectSymbol(Aliasee);
354 }
355 }
356 }
357 if (!Error)
358 return;
359
360 for (const GlobalDecl &GD : Aliases) {
361 StringRef MangledName = getMangledName(GD);
362 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
363 auto *Alias = dyn_cast<llvm::GlobalIndirectSymbol>(Entry);
364 Alias->replaceAllUsesWith(llvm::UndefValue::get(Alias->getType()));
365 Alias->eraseFromParent();
366 }
367}
368
369void CodeGenModule::clear() {
370 DeferredDeclsToEmit.clear();
371 if (OpenMPRuntime)
372 OpenMPRuntime->clear();
373}
374
375void InstrProfStats::reportDiagnostics(DiagnosticsEngine &Diags,
376 StringRef MainFile) {
377 if (!hasDiagnostics())
378 return;
379 if (VisitedInMainFile > 0 && VisitedInMainFile == MissingInMainFile) {
380 if (MainFile.empty())
381 MainFile = "<stdin>";
382 Diags.Report(diag::warn_profile_data_unprofiled) << MainFile;
383 } else {
384 if (Mismatched > 0)
385 Diags.Report(diag::warn_profile_data_out_of_date) << Visited << Mismatched;
386
387 if (Missing > 0)
388 Diags.Report(diag::warn_profile_data_missing) << Visited << Missing;
389 }
390}
391
392void CodeGenModule::Release() {
393 EmitDeferred();
394 EmitVTablesOpportunistically();
395 applyGlobalValReplacements();
396 applyReplacements();
397 checkAliases();
398 emitMultiVersionFunctions();
399 EmitCXXGlobalInitFunc();
400 EmitCXXGlobalDtorFunc();
401 EmitCXXThreadLocalInitFunc();
402 if (ObjCRuntime)
403 if (llvm::Function *ObjCInitFunction = ObjCRuntime->ModuleInitFunction())
404 AddGlobalCtor(ObjCInitFunction);
405 if (Context.getLangOpts().CUDA && !Context.getLangOpts().CUDAIsDevice &&
406 CUDARuntime) {
407 if (llvm::Function *CudaCtorFunction = CUDARuntime->makeModuleCtorFunction())
408 AddGlobalCtor(CudaCtorFunction);
409 if (llvm::Function *CudaDtorFunction = CUDARuntime->makeModuleDtorFunction())
410 AddGlobalDtor(CudaDtorFunction);
411 }
412 if (OpenMPRuntime)
413 if (llvm::Function *OpenMPRegistrationFunction =
414 OpenMPRuntime->emitRegistrationFunction()) {
415 auto ComdatKey = OpenMPRegistrationFunction->hasComdat() ?
416 OpenMPRegistrationFunction : nullptr;
417 AddGlobalCtor(OpenMPRegistrationFunction, 0, ComdatKey);
418 }
419 if (PGOReader) {
420 getModule().setProfileSummary(PGOReader->getSummary().getMD(VMContext));
421 if (PGOStats.hasDiagnostics())
422 PGOStats.reportDiagnostics(getDiags(), getCodeGenOpts().MainFileName);
423 }
424 EmitCtorList(GlobalCtors, "llvm.global_ctors");
425 EmitCtorList(GlobalDtors, "llvm.global_dtors");
426 EmitGlobalAnnotations();
427 EmitStaticExternCAliases();
428 EmitDeferredUnusedCoverageMappings();
429 if (CoverageMapping)
430 CoverageMapping->emit();
431 if (CodeGenOpts.SanitizeCfiCrossDso) {
432 CodeGenFunction(*this).EmitCfiCheckFail();
433 CodeGenFunction(*this).EmitCfiCheckStub();
434 }
435 emitAtAvailableLinkGuard();
436 emitLLVMUsed();
437 if (SanStats)
438 SanStats->finish();
439
440 if (CodeGenOpts.Autolink &&
441 (Context.getLangOpts().Modules || !LinkerOptionsMetadata.empty())) {
442 EmitModuleLinkOptions();
443 }
444
445 // Record mregparm value now so it is visible through rest of codegen.
446 if (Context.getTargetInfo().getTriple().getArch() == llvm::Triple::x86)
447 getModule().addModuleFlag(llvm::Module::Error, "NumRegisterParameters",
448 CodeGenOpts.NumRegisterParameters);
449
450 if (CodeGenOpts.DwarfVersion) {
451 // We actually want the latest version when there are conflicts.
452 // We can change from Warning to Latest if such mode is supported.
453 getModule().addModuleFlag(llvm::Module::Warning, "Dwarf Version",
454 CodeGenOpts.DwarfVersion);
455 }
456 if (CodeGenOpts.EmitCodeView) {
457 // Indicate that we want CodeView in the metadata.
458 getModule().addModuleFlag(llvm::Module::Warning, "CodeView", 1);
459 }
460 if (CodeGenOpts.ControlFlowGuard) {
461 // We want function ID tables for Control Flow Guard.
462 getModule().addModuleFlag(llvm::Module::Warning, "cfguard", 1);
463 }
464 if (CodeGenOpts.OptimizationLevel > 0 && CodeGenOpts.StrictVTablePointers) {
465 // We don't support LTO with 2 with different StrictVTablePointers
466 // FIXME: we could support it by stripping all the information introduced
467 // by StrictVTablePointers.
468
469 getModule().addModuleFlag(llvm::Module::Error, "StrictVTablePointers",1);
470
471 llvm::Metadata *Ops[2] = {
472 llvm::MDString::get(VMContext, "StrictVTablePointers"),
473 llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
474 llvm::Type::getInt32Ty(VMContext), 1))};
475
476 getModule().addModuleFlag(llvm::Module::Require,
477 "StrictVTablePointersRequirement",
478 llvm::MDNode::get(VMContext, Ops));
479 }
480 if (DebugInfo)
481 // We support a single version in the linked module. The LLVM
482 // parser will drop debug info with a different version number
483 // (and warn about it, too).
484 getModule().addModuleFlag(llvm::Module::Warning, "Debug Info Version",
485 llvm::DEBUG_METADATA_VERSION);
486
487 // We need to record the widths of enums and wchar_t, so that we can generate
488 // the correct build attributes in the ARM backend. wchar_size is also used by
489 // TargetLibraryInfo.
490 uint64_t WCharWidth =
491 Context.getTypeSizeInChars(Context.getWideCharType()).getQuantity();
492 getModule().addModuleFlag(llvm::Module::Error, "wchar_size", WCharWidth);
493
494 llvm::Triple::ArchType Arch = Context.getTargetInfo().getTriple().getArch();
495 if ( Arch == llvm::Triple::arm
496 || Arch == llvm::Triple::armeb
497 || Arch == llvm::Triple::thumb
498 || Arch == llvm::Triple::thumbeb) {
499 // The minimum width of an enum in bytes
500 uint64_t EnumWidth = Context.getLangOpts().ShortEnums ? 1 : 4;
501 getModule().addModuleFlag(llvm::Module::Error, "min_enum_size", EnumWidth);
502 }
503
504 if (CodeGenOpts.SanitizeCfiCrossDso) {
505 // Indicate that we want cross-DSO control flow integrity checks.
506 getModule().addModuleFlag(llvm::Module::Override, "Cross-DSO CFI", 1);
507 }
508
509 if (CodeGenOpts.CFProtectionReturn &&
510 Target.checkCFProtectionReturnSupported(getDiags())) {
511 // Indicate that we want to instrument return control flow protection.
512 getModule().addModuleFlag(llvm::Module::Override, "cf-protection-return",
513 1);
514 }
515
516 if (CodeGenOpts.CFProtectionBranch &&
517 Target.checkCFProtectionBranchSupported(getDiags())) {
518 // Indicate that we want to instrument branch control flow protection.
519 getModule().addModuleFlag(llvm::Module::Override, "cf-protection-branch",
520 1);
521 }
522
523 if (LangOpts.CUDAIsDevice && getTriple().isNVPTX()) {
524 // Indicate whether __nvvm_reflect should be configured to flush denormal
525 // floating point values to 0. (This corresponds to its "__CUDA_FTZ"
526 // property.)
527 getModule().addModuleFlag(llvm::Module::Override, "nvvm-reflect-ftz",
528 LangOpts.CUDADeviceFlushDenormalsToZero ? 1 : 0);
529 }
530
531 // Emit OpenCL specific module metadata: OpenCL/SPIR version.
532 if (LangOpts.OpenCL) {
533 EmitOpenCLMetadata();
534 // Emit SPIR version.
535 if (getTriple().getArch() == llvm::Triple::spir ||
536 getTriple().getArch() == llvm::Triple::spir64) {
537 // SPIR v2.0 s2.12 - The SPIR version used by the module is stored in the
538 // opencl.spir.version named metadata.
539 llvm::Metadata *SPIRVerElts[] = {
540 llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
541 Int32Ty, LangOpts.OpenCLVersion / 100)),
542 llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
543 Int32Ty, (LangOpts.OpenCLVersion / 100 > 1) ? 0 : 2))};
544 llvm::NamedMDNode *SPIRVerMD =
545 TheModule.getOrInsertNamedMetadata("opencl.spir.version");
546 llvm::LLVMContext &Ctx = TheModule.getContext();
547 SPIRVerMD->addOperand(llvm::MDNode::get(Ctx, SPIRVerElts));
548 }
549 }
550
551 if (uint32_t PLevel = Context.getLangOpts().PICLevel) {
552 assert(PLevel < 3 && "Invalid PIC Level")(static_cast <bool> (PLevel < 3 && "Invalid PIC Level"
) ? void (0) : __assert_fail ("PLevel < 3 && \"Invalid PIC Level\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 552, __extension__ __PRETTY_FUNCTION__))
;
553 getModule().setPICLevel(static_cast<llvm::PICLevel::Level>(PLevel));
554 if (Context.getLangOpts().PIE)
555 getModule().setPIELevel(static_cast<llvm::PIELevel::Level>(PLevel));
556 }
557
558 if (CodeGenOpts.NoPLT)
559 getModule().setRtLibUseGOT();
560
561 SimplifyPersonality();
562
563 if (getCodeGenOpts().EmitDeclMetadata)
564 EmitDeclMetadata();
565
566 if (getCodeGenOpts().EmitGcovArcs || getCodeGenOpts().EmitGcovNotes)
567 EmitCoverageFile();
568
569 if (DebugInfo)
570 DebugInfo->finalize();
571
572 EmitVersionIdentMetadata();
573
574 EmitTargetMetadata();
575}
576
577void CodeGenModule::EmitOpenCLMetadata() {
578 // SPIR v2.0 s2.13 - The OpenCL version used by the module is stored in the
579 // opencl.ocl.version named metadata node.
580 llvm::Metadata *OCLVerElts[] = {
581 llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
582 Int32Ty, LangOpts.OpenCLVersion / 100)),
583 llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
584 Int32Ty, (LangOpts.OpenCLVersion % 100) / 10))};
585 llvm::NamedMDNode *OCLVerMD =
586 TheModule.getOrInsertNamedMetadata("opencl.ocl.version");
587 llvm::LLVMContext &Ctx = TheModule.getContext();
588 OCLVerMD->addOperand(llvm::MDNode::get(Ctx, OCLVerElts));
589}
590
591void CodeGenModule::UpdateCompletedType(const TagDecl *TD) {
592 // Make sure that this type is translated.
593 Types.UpdateCompletedType(TD);
594}
595
596void CodeGenModule::RefreshTypeCacheForClass(const CXXRecordDecl *RD) {
597 // Make sure that this type is translated.
598 Types.RefreshTypeCacheForClass(RD);
599}
600
601llvm::MDNode *CodeGenModule::getTBAATypeInfo(QualType QTy) {
602 if (!TBAA)
603 return nullptr;
604 return TBAA->getTypeInfo(QTy);
605}
606
607TBAAAccessInfo CodeGenModule::getTBAAAccessInfo(QualType AccessType) {
608 if (!TBAA)
609 return TBAAAccessInfo();
610 return TBAA->getAccessInfo(AccessType);
611}
612
613TBAAAccessInfo
614CodeGenModule::getTBAAVTablePtrAccessInfo(llvm::Type *VTablePtrType) {
615 if (!TBAA)
616 return TBAAAccessInfo();
617 return TBAA->getVTablePtrAccessInfo(VTablePtrType);
618}
619
620llvm::MDNode *CodeGenModule::getTBAAStructInfo(QualType QTy) {
621 if (!TBAA)
622 return nullptr;
623 return TBAA->getTBAAStructInfo(QTy);
624}
625
626llvm::MDNode *CodeGenModule::getTBAABaseTypeInfo(QualType QTy) {
627 if (!TBAA)
628 return nullptr;
629 return TBAA->getBaseTypeInfo(QTy);
630}
631
632llvm::MDNode *CodeGenModule::getTBAAAccessTagInfo(TBAAAccessInfo Info) {
633 if (!TBAA)
634 return nullptr;
635 return TBAA->getAccessTagInfo(Info);
636}
637
638TBAAAccessInfo CodeGenModule::mergeTBAAInfoForCast(TBAAAccessInfo SourceInfo,
639 TBAAAccessInfo TargetInfo) {
640 if (!TBAA)
641 return TBAAAccessInfo();
642 return TBAA->mergeTBAAInfoForCast(SourceInfo, TargetInfo);
643}
644
645TBAAAccessInfo
646CodeGenModule::mergeTBAAInfoForConditionalOperator(TBAAAccessInfo InfoA,
647 TBAAAccessInfo InfoB) {
648 if (!TBAA)
649 return TBAAAccessInfo();
650 return TBAA->mergeTBAAInfoForConditionalOperator(InfoA, InfoB);
651}
652
653TBAAAccessInfo
654CodeGenModule::mergeTBAAInfoForMemoryTransfer(TBAAAccessInfo DestInfo,
655 TBAAAccessInfo SrcInfo) {
656 if (!TBAA)
657 return TBAAAccessInfo();
658 return TBAA->mergeTBAAInfoForConditionalOperator(DestInfo, SrcInfo);
659}
660
661void CodeGenModule::DecorateInstructionWithTBAA(llvm::Instruction *Inst,
662 TBAAAccessInfo TBAAInfo) {
663 if (llvm::MDNode *Tag = getTBAAAccessTagInfo(TBAAInfo))
664 Inst->setMetadata(llvm::LLVMContext::MD_tbaa, Tag);
665}
666
667void CodeGenModule::DecorateInstructionWithInvariantGroup(
668 llvm::Instruction *I, const CXXRecordDecl *RD) {
669 I->setMetadata(llvm::LLVMContext::MD_invariant_group,
670 llvm::MDNode::get(getLLVMContext(), {}));
671}
672
673void CodeGenModule::Error(SourceLocation loc, StringRef message) {
674 unsigned diagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error, "%0");
675 getDiags().Report(Context.getFullLoc(loc), diagID) << message;
676}
677
678/// ErrorUnsupported - Print out an error that codegen doesn't support the
679/// specified stmt yet.
680void CodeGenModule::ErrorUnsupported(const Stmt *S, const char *Type) {
681 unsigned DiagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error,
682 "cannot compile this %0 yet");
683 std::string Msg = Type;
684 getDiags().Report(Context.getFullLoc(S->getLocStart()), DiagID)
685 << Msg << S->getSourceRange();
686}
687
688/// ErrorUnsupported - Print out an error that codegen doesn't support the
689/// specified decl yet.
690void CodeGenModule::ErrorUnsupported(const Decl *D, const char *Type) {
691 unsigned DiagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error,
692 "cannot compile this %0 yet");
693 std::string Msg = Type;
694 getDiags().Report(Context.getFullLoc(D->getLocation()), DiagID) << Msg;
695}
696
697llvm::ConstantInt *CodeGenModule::getSize(CharUnits size) {
698 return llvm::ConstantInt::get(SizeTy, size.getQuantity());
699}
700
701void CodeGenModule::setGlobalVisibility(llvm::GlobalValue *GV,
702 const NamedDecl *D) const {
703 if (GV->hasDLLImportStorageClass())
704 return;
705 // Internal definitions always have default visibility.
706 if (GV->hasLocalLinkage()) {
707 GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
708 return;
709 }
710
711 // Set visibility for definitions.
712 LinkageInfo LV = D->getLinkageAndVisibility();
713 if (LV.isVisibilityExplicit() || !GV->isDeclarationForLinker())
714 GV->setVisibility(GetLLVMVisibility(LV.getVisibility()));
715}
716
717static bool shouldAssumeDSOLocal(const CodeGenModule &CGM,
718 llvm::GlobalValue *GV) {
719 // DLLImport explicitly marks the GV as external.
720 if (GV->hasDLLImportStorageClass())
721 return false;
722
723 const llvm::Triple &TT = CGM.getTriple();
724 // Every other GV is local on COFF.
725 // Make an exception for windows OS in the triple: Some firmware builds use
726 // *-win32-macho triples. This (accidentally?) produced windows relocations
727 // without GOT tables in older clang versions; Keep this behaviour.
728 // FIXME: even thread local variables?
729 if (TT.isOSBinFormatCOFF() || (TT.isOSWindows() && TT.isOSBinFormatMachO()))
730 return true;
731
732 // Only handle COFF and ELF for now.
733 if (!TT.isOSBinFormatELF())
734 return false;
735
736 // If this is not an executable, don't assume anything is local.
737 const auto &CGOpts = CGM.getCodeGenOpts();
738 llvm::Reloc::Model RM = CGOpts.RelocationModel;
739 const auto &LOpts = CGM.getLangOpts();
740 if (RM != llvm::Reloc::Static && !LOpts.PIE)
741 return false;
742
743 // A definition cannot be preempted from an executable.
744 if (!GV->isDeclarationForLinker())
745 return true;
746
747 // Most PIC code sequences that assume that a symbol is local cannot produce a
748 // 0 if it turns out the symbol is undefined. While this is ABI and relocation
749 // depended, it seems worth it to handle it here.
750 if (RM == llvm::Reloc::PIC_ && GV->hasExternalWeakLinkage())
751 return false;
752
753 // PPC has no copy relocations and cannot use a plt entry as a symbol address.
754 llvm::Triple::ArchType Arch = TT.getArch();
755 if (Arch == llvm::Triple::ppc || Arch == llvm::Triple::ppc64 ||
756 Arch == llvm::Triple::ppc64le)
757 return false;
758
759 // If we can use copy relocations we can assume it is local.
760 if (auto *Var = dyn_cast<llvm::GlobalVariable>(GV))
761 if (!Var->isThreadLocal() &&
762 (RM == llvm::Reloc::Static || CGOpts.PIECopyRelocations))
763 return true;
764
765 // If we can use a plt entry as the symbol address we can assume it
766 // is local.
767 // FIXME: This should work for PIE, but the gold linker doesn't support it.
768 if (isa<llvm::Function>(GV) && !CGOpts.NoPLT && RM == llvm::Reloc::Static)
769 return true;
770
771 // Otherwise don't assue it is local.
772 return false;
773}
774
775void CodeGenModule::setDSOLocal(llvm::GlobalValue *GV) const {
776 if (shouldAssumeDSOLocal(*this, GV))
777 GV->setDSOLocal(true);
778}
779
780void CodeGenModule::setGVProperties(llvm::GlobalValue *GV,
781 const NamedDecl *D) const {
782 setGlobalVisibility(GV, D);
783 setDSOLocal(GV);
784}
785
786static llvm::GlobalVariable::ThreadLocalMode GetLLVMTLSModel(StringRef S) {
787 return llvm::StringSwitch<llvm::GlobalVariable::ThreadLocalMode>(S)
788 .Case("global-dynamic", llvm::GlobalVariable::GeneralDynamicTLSModel)
789 .Case("local-dynamic", llvm::GlobalVariable::LocalDynamicTLSModel)
790 .Case("initial-exec", llvm::GlobalVariable::InitialExecTLSModel)
791 .Case("local-exec", llvm::GlobalVariable::LocalExecTLSModel);
792}
793
794static llvm::GlobalVariable::ThreadLocalMode GetLLVMTLSModel(
795 CodeGenOptions::TLSModel M) {
796 switch (M) {
797 case CodeGenOptions::GeneralDynamicTLSModel:
798 return llvm::GlobalVariable::GeneralDynamicTLSModel;
799 case CodeGenOptions::LocalDynamicTLSModel:
800 return llvm::GlobalVariable::LocalDynamicTLSModel;
801 case CodeGenOptions::InitialExecTLSModel:
802 return llvm::GlobalVariable::InitialExecTLSModel;
803 case CodeGenOptions::LocalExecTLSModel:
804 return llvm::GlobalVariable::LocalExecTLSModel;
805 }
806 llvm_unreachable("Invalid TLS model!")::llvm::llvm_unreachable_internal("Invalid TLS model!", "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 806)
;
807}
808
809void CodeGenModule::setTLSMode(llvm::GlobalValue *GV, const VarDecl &D) const {
810 assert(D.getTLSKind() && "setting TLS mode on non-TLS var!")(static_cast <bool> (D.getTLSKind() && "setting TLS mode on non-TLS var!"
) ? void (0) : __assert_fail ("D.getTLSKind() && \"setting TLS mode on non-TLS var!\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 810, __extension__ __PRETTY_FUNCTION__))
;
811
812 llvm::GlobalValue::ThreadLocalMode TLM;
813 TLM = GetLLVMTLSModel(CodeGenOpts.getDefaultTLSModel());
814
815 // Override the TLS model if it is explicitly specified.
816 if (const TLSModelAttr *Attr = D.getAttr<TLSModelAttr>()) {
817 TLM = GetLLVMTLSModel(Attr->getModel());
818 }
819
820 GV->setThreadLocalMode(TLM);
821}
822
823static void AppendTargetMangling(const CodeGenModule &CGM,
824 const TargetAttr *Attr, raw_ostream &Out) {
825 if (Attr->isDefaultVersion())
826 return;
827
828 Out << '.';
829 const auto &Target = CGM.getTarget();
830 TargetAttr::ParsedTargetAttr Info =
831 Attr->parse([&Target](StringRef LHS, StringRef RHS) {
832 // Multiversioning doesn't allow "no-${feature}", so we can
833 // only have "+" prefixes here.
834 assert(LHS.startswith("+") && RHS.startswith("+") &&(static_cast <bool> (LHS.startswith("+") && RHS
.startswith("+") && "Features should always have a prefix."
) ? void (0) : __assert_fail ("LHS.startswith(\"+\") && RHS.startswith(\"+\") && \"Features should always have a prefix.\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 835, __extension__ __PRETTY_FUNCTION__))
835 "Features should always have a prefix.")(static_cast <bool> (LHS.startswith("+") && RHS
.startswith("+") && "Features should always have a prefix."
) ? void (0) : __assert_fail ("LHS.startswith(\"+\") && RHS.startswith(\"+\") && \"Features should always have a prefix.\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 835, __extension__ __PRETTY_FUNCTION__))
;
836 return Target.multiVersionSortPriority(LHS.substr(1)) >
837 Target.multiVersionSortPriority(RHS.substr(1));
838 });
839
840 bool IsFirst = true;
841
842 if (!Info.Architecture.empty()) {
843 IsFirst = false;
844 Out << "arch_" << Info.Architecture;
845 }
846
847 for (StringRef Feat : Info.Features) {
848 if (!IsFirst)
849 Out << '_';
850 IsFirst = false;
851 Out << Feat.substr(1);
852 }
853}
854
855static std::string getMangledNameImpl(const CodeGenModule &CGM, GlobalDecl GD,
856 const NamedDecl *ND,
857 bool OmitTargetMangling = false) {
858 SmallString<256> Buffer;
859 llvm::raw_svector_ostream Out(Buffer);
860 MangleContext &MC = CGM.getCXXABI().getMangleContext();
861 if (MC.shouldMangleDeclName(ND)) {
862 llvm::raw_svector_ostream Out(Buffer);
863 if (const auto *D = dyn_cast<CXXConstructorDecl>(ND))
864 MC.mangleCXXCtor(D, GD.getCtorType(), Out);
865 else if (const auto *D = dyn_cast<CXXDestructorDecl>(ND))
866 MC.mangleCXXDtor(D, GD.getDtorType(), Out);
867 else
868 MC.mangleName(ND, Out);
869 } else {
870 IdentifierInfo *II = ND->getIdentifier();
871 assert(II && "Attempt to mangle unnamed decl.")(static_cast <bool> (II && "Attempt to mangle unnamed decl."
) ? void (0) : __assert_fail ("II && \"Attempt to mangle unnamed decl.\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 871, __extension__ __PRETTY_FUNCTION__))
;
872 const auto *FD = dyn_cast<FunctionDecl>(ND);
873
874 if (FD &&
875 FD->getType()->castAs<FunctionType>()->getCallConv() == CC_X86RegCall) {
876 llvm::raw_svector_ostream Out(Buffer);
877 Out << "__regcall3__" << II->getName();
878 } else {
879 Out << II->getName();
880 }
881 }
882
883 if (const auto *FD = dyn_cast<FunctionDecl>(ND))
884 if (FD->isMultiVersion() && !OmitTargetMangling)
885 AppendTargetMangling(CGM, FD->getAttr<TargetAttr>(), Out);
886 return Out.str();
887}
888
889void CodeGenModule::UpdateMultiVersionNames(GlobalDecl GD,
890 const FunctionDecl *FD) {
891 if (!FD->isMultiVersion())
892 return;
893
894 // Get the name of what this would be without the 'target' attribute. This
895 // allows us to lookup the version that was emitted when this wasn't a
896 // multiversion function.
897 std::string NonTargetName =
898 getMangledNameImpl(*this, GD, FD, /*OmitTargetMangling=*/true);
899 GlobalDecl OtherGD;
900 if (lookupRepresentativeDecl(NonTargetName, OtherGD)) {
901 assert(OtherGD.getCanonicalDecl()(static_cast <bool> (OtherGD.getCanonicalDecl() .getDecl
() ->getAsFunction() ->isMultiVersion() && "Other GD should now be a multiversioned function"
) ? void (0) : __assert_fail ("OtherGD.getCanonicalDecl() .getDecl() ->getAsFunction() ->isMultiVersion() && \"Other GD should now be a multiversioned function\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 905, __extension__ __PRETTY_FUNCTION__))
902 .getDecl()(static_cast <bool> (OtherGD.getCanonicalDecl() .getDecl
() ->getAsFunction() ->isMultiVersion() && "Other GD should now be a multiversioned function"
) ? void (0) : __assert_fail ("OtherGD.getCanonicalDecl() .getDecl() ->getAsFunction() ->isMultiVersion() && \"Other GD should now be a multiversioned function\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 905, __extension__ __PRETTY_FUNCTION__))
903 ->getAsFunction()(static_cast <bool> (OtherGD.getCanonicalDecl() .getDecl
() ->getAsFunction() ->isMultiVersion() && "Other GD should now be a multiversioned function"
) ? void (0) : __assert_fail ("OtherGD.getCanonicalDecl() .getDecl() ->getAsFunction() ->isMultiVersion() && \"Other GD should now be a multiversioned function\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 905, __extension__ __PRETTY_FUNCTION__))
904 ->isMultiVersion() &&(static_cast <bool> (OtherGD.getCanonicalDecl() .getDecl
() ->getAsFunction() ->isMultiVersion() && "Other GD should now be a multiversioned function"
) ? void (0) : __assert_fail ("OtherGD.getCanonicalDecl() .getDecl() ->getAsFunction() ->isMultiVersion() && \"Other GD should now be a multiversioned function\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 905, __extension__ __PRETTY_FUNCTION__))
905 "Other GD should now be a multiversioned function")(static_cast <bool> (OtherGD.getCanonicalDecl() .getDecl
() ->getAsFunction() ->isMultiVersion() && "Other GD should now be a multiversioned function"
) ? void (0) : __assert_fail ("OtherGD.getCanonicalDecl() .getDecl() ->getAsFunction() ->isMultiVersion() && \"Other GD should now be a multiversioned function\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 905, __extension__ __PRETTY_FUNCTION__))
;
906 // OtherFD is the version of this function that was mangled BEFORE
907 // becoming a MultiVersion function. It potentially needs to be updated.
908 const FunctionDecl *OtherFD =
909 OtherGD.getCanonicalDecl().getDecl()->getAsFunction();
910 std::string OtherName = getMangledNameImpl(*this, OtherGD, OtherFD);
911 // This is so that if the initial version was already the 'default'
912 // version, we don't try to update it.
913 if (OtherName != NonTargetName) {
914 // Remove instead of erase, since others may have stored the StringRef
915 // to this.
916 const auto ExistingRecord = Manglings.find(NonTargetName);
917 if (ExistingRecord != std::end(Manglings))
918 Manglings.remove(&(*ExistingRecord));
919 auto Result = Manglings.insert(std::make_pair(OtherName, OtherGD));
920 MangledDeclNames[OtherGD.getCanonicalDecl()] = Result.first->first();
921 if (llvm::GlobalValue *Entry = GetGlobalValue(NonTargetName))
922 Entry->setName(OtherName);
923 }
924 }
925}
926
927StringRef CodeGenModule::getMangledName(GlobalDecl GD) {
928 GlobalDecl CanonicalGD = GD.getCanonicalDecl();
929
930 // Some ABIs don't have constructor variants. Make sure that base and
931 // complete constructors get mangled the same.
932 if (const auto *CD = dyn_cast<CXXConstructorDecl>(CanonicalGD.getDecl())) {
933 if (!getTarget().getCXXABI().hasConstructorVariants()) {
934 CXXCtorType OrigCtorType = GD.getCtorType();
935 assert(OrigCtorType == Ctor_Base || OrigCtorType == Ctor_Complete)(static_cast <bool> (OrigCtorType == Ctor_Base || OrigCtorType
== Ctor_Complete) ? void (0) : __assert_fail ("OrigCtorType == Ctor_Base || OrigCtorType == Ctor_Complete"
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 935, __extension__ __PRETTY_FUNCTION__))
;
936 if (OrigCtorType == Ctor_Base)
937 CanonicalGD = GlobalDecl(CD, Ctor_Complete);
938 }
939 }
940
941 auto FoundName = MangledDeclNames.find(CanonicalGD);
942 if (FoundName != MangledDeclNames.end())
943 return FoundName->second;
944
945
946 // Keep the first result in the case of a mangling collision.
947 const auto *ND = cast<NamedDecl>(GD.getDecl());
948 auto Result =
949 Manglings.insert(std::make_pair(getMangledNameImpl(*this, GD, ND), GD));
950 return MangledDeclNames[CanonicalGD] = Result.first->first();
951}
952
953StringRef CodeGenModule::getBlockMangledName(GlobalDecl GD,
954 const BlockDecl *BD) {
955 MangleContext &MangleCtx = getCXXABI().getMangleContext();
956 const Decl *D = GD.getDecl();
957
958 SmallString<256> Buffer;
959 llvm::raw_svector_ostream Out(Buffer);
960 if (!D)
961 MangleCtx.mangleGlobalBlock(BD,
962 dyn_cast_or_null<VarDecl>(initializedGlobalDecl.getDecl()), Out);
963 else if (const auto *CD = dyn_cast<CXXConstructorDecl>(D))
964 MangleCtx.mangleCtorBlock(CD, GD.getCtorType(), BD, Out);
965 else if (const auto *DD = dyn_cast<CXXDestructorDecl>(D))
966 MangleCtx.mangleDtorBlock(DD, GD.getDtorType(), BD, Out);
967 else
968 MangleCtx.mangleBlock(cast<DeclContext>(D), BD, Out);
969
970 auto Result = Manglings.insert(std::make_pair(Out.str(), BD));
971 return Result.first->first();
972}
973
974llvm::GlobalValue *CodeGenModule::GetGlobalValue(StringRef Name) {
975 return getModule().getNamedValue(Name);
976}
977
978/// AddGlobalCtor - Add a function to the list that will be called before
979/// main() runs.
980void CodeGenModule::AddGlobalCtor(llvm::Function *Ctor, int Priority,
981 llvm::Constant *AssociatedData) {
982 // FIXME: Type coercion of void()* types.
983 GlobalCtors.push_back(Structor(Priority, Ctor, AssociatedData));
984}
985
986/// AddGlobalDtor - Add a function to the list that will be called
987/// when the module is unloaded.
988void CodeGenModule::AddGlobalDtor(llvm::Function *Dtor, int Priority) {
989 // FIXME: Type coercion of void()* types.
990 GlobalDtors.push_back(Structor(Priority, Dtor, nullptr));
991}
992
993void CodeGenModule::EmitCtorList(CtorList &Fns, const char *GlobalName) {
994 if (Fns.empty()) return;
995
996 // Ctor function type is void()*.
997 llvm::FunctionType* CtorFTy = llvm::FunctionType::get(VoidTy, false);
998 llvm::Type *CtorPFTy = llvm::PointerType::getUnqual(CtorFTy);
999
1000 // Get the type of a ctor entry, { i32, void ()*, i8* }.
1001 llvm::StructType *CtorStructTy = llvm::StructType::get(
1002 Int32Ty, llvm::PointerType::getUnqual(CtorFTy), VoidPtrTy);
1003
1004 // Construct the constructor and destructor arrays.
1005 ConstantInitBuilder builder(*this);
1006 auto ctors = builder.beginArray(CtorStructTy);
1007 for (const auto &I : Fns) {
1008 auto ctor = ctors.beginStruct(CtorStructTy);
1009 ctor.addInt(Int32Ty, I.Priority);
1010 ctor.add(llvm::ConstantExpr::getBitCast(I.Initializer, CtorPFTy));
1011 if (I.AssociatedData)
1012 ctor.add(llvm::ConstantExpr::getBitCast(I.AssociatedData, VoidPtrTy));
1013 else
1014 ctor.addNullPointer(VoidPtrTy);
1015 ctor.finishAndAddTo(ctors);
1016 }
1017
1018 auto list =
1019 ctors.finishAndCreateGlobal(GlobalName, getPointerAlign(),
1020 /*constant*/ false,
1021 llvm::GlobalValue::AppendingLinkage);
1022
1023 // The LTO linker doesn't seem to like it when we set an alignment
1024 // on appending variables. Take it off as a workaround.
1025 list->setAlignment(0);
1026
1027 Fns.clear();
1028}
1029
1030llvm::GlobalValue::LinkageTypes
1031CodeGenModule::getFunctionLinkage(GlobalDecl GD) {
1032 const auto *D = cast<FunctionDecl>(GD.getDecl());
1033
1034 GVALinkage Linkage = getContext().GetGVALinkageForFunction(D);
1035
1036 if (isa<CXXDestructorDecl>(D) &&
1037 getCXXABI().useThunkForDtorVariant(cast<CXXDestructorDecl>(D),
1038 GD.getDtorType())) {
1039 // Destructor variants in the Microsoft C++ ABI are always internal or
1040 // linkonce_odr thunks emitted on an as-needed basis.
1041 return Linkage == GVA_Internal ? llvm::GlobalValue::InternalLinkage
1042 : llvm::GlobalValue::LinkOnceODRLinkage;
1043 }
1044
1045 if (isa<CXXConstructorDecl>(D) &&
1046 cast<CXXConstructorDecl>(D)->isInheritingConstructor() &&
1047 Context.getTargetInfo().getCXXABI().isMicrosoft()) {
1048 // Our approach to inheriting constructors is fundamentally different from
1049 // that used by the MS ABI, so keep our inheriting constructor thunks
1050 // internal rather than trying to pick an unambiguous mangling for them.
1051 return llvm::GlobalValue::InternalLinkage;
1052 }
1053
1054 return getLLVMLinkageForDeclarator(D, Linkage, /*isConstantVariable=*/false);
1055}
1056
1057void CodeGenModule::setFunctionDLLStorageClass(GlobalDecl GD, llvm::Function *F) {
1058 const auto *FD = cast<FunctionDecl>(GD.getDecl());
1059
1060 if (const auto *Dtor = dyn_cast_or_null<CXXDestructorDecl>(FD)) {
1061 if (getCXXABI().useThunkForDtorVariant(Dtor, GD.getDtorType())) {
1062 // Don't dllexport/import destructor thunks.
1063 F->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
1064 return;
1065 }
1066 }
1067
1068 if (FD->hasAttr<DLLImportAttr>())
1069 F->setDLLStorageClass(llvm::GlobalVariable::DLLImportStorageClass);
1070 else if (FD->hasAttr<DLLExportAttr>())
1071 F->setDLLStorageClass(llvm::GlobalVariable::DLLExportStorageClass);
1072 else
1073 F->setDLLStorageClass(llvm::GlobalVariable::DefaultStorageClass);
1074}
1075
1076llvm::ConstantInt *CodeGenModule::CreateCrossDsoCfiTypeId(llvm::Metadata *MD) {
1077 llvm::MDString *MDS = dyn_cast<llvm::MDString>(MD);
1078 if (!MDS) return nullptr;
1079
1080 return llvm::ConstantInt::get(Int64Ty, llvm::MD5Hash(MDS->getString()));
1081}
1082
1083void CodeGenModule::setFunctionDefinitionAttributes(const FunctionDecl *D,
1084 llvm::Function *F) {
1085 setNonAliasAttributes(D, F);
1086}
1087
1088void CodeGenModule::SetLLVMFunctionAttributes(const Decl *D,
1089 const CGFunctionInfo &Info,
1090 llvm::Function *F) {
1091 unsigned CallingConv;
1092 llvm::AttributeList PAL;
1093 ConstructAttributeList(F->getName(), Info, D, PAL, CallingConv, false);
1094 F->setAttributes(PAL);
1095 F->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv));
1096}
1097
1098/// Determines whether the language options require us to model
1099/// unwind exceptions. We treat -fexceptions as mandating this
1100/// except under the fragile ObjC ABI with only ObjC exceptions
1101/// enabled. This means, for example, that C with -fexceptions
1102/// enables this.
1103static bool hasUnwindExceptions(const LangOptions &LangOpts) {
1104 // If exceptions are completely disabled, obviously this is false.
1105 if (!LangOpts.Exceptions) return false;
1106
1107 // If C++ exceptions are enabled, this is true.
1108 if (LangOpts.CXXExceptions) return true;
1109
1110 // If ObjC exceptions are enabled, this depends on the ABI.
1111 if (LangOpts.ObjCExceptions) {
1112 return LangOpts.ObjCRuntime.hasUnwindExceptions();
1113 }
1114
1115 return true;
1116}
1117
1118void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D,
1119 llvm::Function *F) {
1120 llvm::AttrBuilder B;
1121
1122 if (CodeGenOpts.UnwindTables)
1123 B.addAttribute(llvm::Attribute::UWTable);
1124
1125 if (!hasUnwindExceptions(LangOpts))
1126 B.addAttribute(llvm::Attribute::NoUnwind);
1127
1128 if (LangOpts.getStackProtector() == LangOptions::SSPOn)
1129 B.addAttribute(llvm::Attribute::StackProtect);
1130 else if (LangOpts.getStackProtector() == LangOptions::SSPStrong)
1131 B.addAttribute(llvm::Attribute::StackProtectStrong);
1132 else if (LangOpts.getStackProtector() == LangOptions::SSPReq)
1133 B.addAttribute(llvm::Attribute::StackProtectReq);
1134
1135 if (!D) {
1136 // If we don't have a declaration to control inlining, the function isn't
1137 // explicitly marked as alwaysinline for semantic reasons, and inlining is
1138 // disabled, mark the function as noinline.
1139 if (!F->hasFnAttribute(llvm::Attribute::AlwaysInline) &&
1140 CodeGenOpts.getInlining() == CodeGenOptions::OnlyAlwaysInlining)
1141 B.addAttribute(llvm::Attribute::NoInline);
1142
1143 F->addAttributes(llvm::AttributeList::FunctionIndex, B);
1144 return;
1145 }
1146
1147 // Track whether we need to add the optnone LLVM attribute,
1148 // starting with the default for this optimization level.
1149 bool ShouldAddOptNone =
1150 !CodeGenOpts.DisableO0ImplyOptNone && CodeGenOpts.OptimizationLevel == 0;
1151 // We can't add optnone in the following cases, it won't pass the verifier.
1152 ShouldAddOptNone &= !D->hasAttr<MinSizeAttr>();
1153 ShouldAddOptNone &= !F->hasFnAttribute(llvm::Attribute::AlwaysInline);
1154 ShouldAddOptNone &= !D->hasAttr<AlwaysInlineAttr>();
1155
1156 if (ShouldAddOptNone || D->hasAttr<OptimizeNoneAttr>()) {
1157 B.addAttribute(llvm::Attribute::OptimizeNone);
1158
1159 // OptimizeNone implies noinline; we should not be inlining such functions.
1160 B.addAttribute(llvm::Attribute::NoInline);
1161 assert(!F->hasFnAttribute(llvm::Attribute::AlwaysInline) &&(static_cast <bool> (!F->hasFnAttribute(llvm::Attribute
::AlwaysInline) && "OptimizeNone and AlwaysInline on same function!"
) ? void (0) : __assert_fail ("!F->hasFnAttribute(llvm::Attribute::AlwaysInline) && \"OptimizeNone and AlwaysInline on same function!\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1162, __extension__ __PRETTY_FUNCTION__))
1162 "OptimizeNone and AlwaysInline on same function!")(static_cast <bool> (!F->hasFnAttribute(llvm::Attribute
::AlwaysInline) && "OptimizeNone and AlwaysInline on same function!"
) ? void (0) : __assert_fail ("!F->hasFnAttribute(llvm::Attribute::AlwaysInline) && \"OptimizeNone and AlwaysInline on same function!\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1162, __extension__ __PRETTY_FUNCTION__))
;
1163
1164 // We still need to handle naked functions even though optnone subsumes
1165 // much of their semantics.
1166 if (D->hasAttr<NakedAttr>())
1167 B.addAttribute(llvm::Attribute::Naked);
1168
1169 // OptimizeNone wins over OptimizeForSize and MinSize.
1170 F->removeFnAttr(llvm::Attribute::OptimizeForSize);
1171 F->removeFnAttr(llvm::Attribute::MinSize);
1172 } else if (D->hasAttr<NakedAttr>()) {
1173 // Naked implies noinline: we should not be inlining such functions.
1174 B.addAttribute(llvm::Attribute::Naked);
1175 B.addAttribute(llvm::Attribute::NoInline);
1176 } else if (D->hasAttr<NoDuplicateAttr>()) {
1177 B.addAttribute(llvm::Attribute::NoDuplicate);
1178 } else if (D->hasAttr<NoInlineAttr>()) {
1179 B.addAttribute(llvm::Attribute::NoInline);
1180 } else if (D->hasAttr<AlwaysInlineAttr>() &&
1181 !F->hasFnAttribute(llvm::Attribute::NoInline)) {
1182 // (noinline wins over always_inline, and we can't specify both in IR)
1183 B.addAttribute(llvm::Attribute::AlwaysInline);
1184 } else if (CodeGenOpts.getInlining() == CodeGenOptions::OnlyAlwaysInlining) {
1185 // If we're not inlining, then force everything that isn't always_inline to
1186 // carry an explicit noinline attribute.
1187 if (!F->hasFnAttribute(llvm::Attribute::AlwaysInline))
1188 B.addAttribute(llvm::Attribute::NoInline);
1189 } else {
1190 // Otherwise, propagate the inline hint attribute and potentially use its
1191 // absence to mark things as noinline.
1192 if (auto *FD = dyn_cast<FunctionDecl>(D)) {
1193 if (any_of(FD->redecls(), [&](const FunctionDecl *Redecl) {
1194 return Redecl->isInlineSpecified();
1195 })) {
1196 B.addAttribute(llvm::Attribute::InlineHint);
1197 } else if (CodeGenOpts.getInlining() ==
1198 CodeGenOptions::OnlyHintInlining &&
1199 !FD->isInlined() &&
1200 !F->hasFnAttribute(llvm::Attribute::AlwaysInline)) {
1201 B.addAttribute(llvm::Attribute::NoInline);
1202 }
1203 }
1204 }
1205
1206 // Add other optimization related attributes if we are optimizing this
1207 // function.
1208 if (!D->hasAttr<OptimizeNoneAttr>()) {
1209 if (D->hasAttr<ColdAttr>()) {
1210 if (!ShouldAddOptNone)
1211 B.addAttribute(llvm::Attribute::OptimizeForSize);
1212 B.addAttribute(llvm::Attribute::Cold);
1213 }
1214
1215 if (D->hasAttr<MinSizeAttr>())
1216 B.addAttribute(llvm::Attribute::MinSize);
1217 }
1218
1219 F->addAttributes(llvm::AttributeList::FunctionIndex, B);
1220
1221 unsigned alignment = D->getMaxAlignment() / Context.getCharWidth();
1222 if (alignment)
1223 F->setAlignment(alignment);
1224
1225 // Some C++ ABIs require 2-byte alignment for member functions, in order to
1226 // reserve a bit for differentiating between virtual and non-virtual member
1227 // functions. If the current target's C++ ABI requires this and this is a
1228 // member function, set its alignment accordingly.
1229 if (getTarget().getCXXABI().areMemberFunctionsAligned()) {
1230 if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D))
1231 F->setAlignment(2);
1232 }
1233
1234 // In the cross-dso CFI mode, we want !type attributes on definitions only.
1235 if (CodeGenOpts.SanitizeCfiCrossDso)
1236 if (auto *FD = dyn_cast<FunctionDecl>(D))
1237 CreateFunctionTypeMetadata(FD, F);
1238}
1239
1240void CodeGenModule::SetCommonAttributes(const Decl *D,
1241 llvm::GlobalValue *GV) {
1242 if (const auto *ND = dyn_cast_or_null<NamedDecl>(D))
1243 setGVProperties(GV, ND);
1244 else
1245 GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
1246
1247 if (D && D->hasAttr<UsedAttr>())
1248 addUsedGlobal(GV);
1249}
1250
1251void CodeGenModule::setAliasAttributes(const Decl *D,
1252 llvm::GlobalValue *GV) {
1253 SetCommonAttributes(D, GV);
1254
1255 // Process the dllexport attribute based on whether the original definition
1256 // (not necessarily the aliasee) was exported.
1257 if (D->hasAttr<DLLExportAttr>())
1258 GV->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
1259}
1260
1261bool CodeGenModule::GetCPUAndFeaturesAttributes(const Decl *D,
1262 llvm::AttrBuilder &Attrs) {
1263 // Add target-cpu and target-features attributes to functions. If
1264 // we have a decl for the function and it has a target attribute then
1265 // parse that and add it to the feature set.
1266 StringRef TargetCPU = getTarget().getTargetOpts().CPU;
1267 std::vector<std::string> Features;
1268 const auto *FD = dyn_cast_or_null<FunctionDecl>(D);
1269 FD = FD ? FD->getMostRecentDecl() : FD;
1270 const auto *TD = FD ? FD->getAttr<TargetAttr>() : nullptr;
1271 bool AddedAttr = false;
1272 if (TD) {
1273 llvm::StringMap<bool> FeatureMap;
1274 getFunctionFeatureMap(FeatureMap, FD);
1275
1276 // Produce the canonical string for this set of features.
1277 for (const llvm::StringMap<bool>::value_type &Entry : FeatureMap)
1278 Features.push_back((Entry.getValue() ? "+" : "-") + Entry.getKey().str());
1279
1280 // Now add the target-cpu and target-features to the function.
1281 // While we populated the feature map above, we still need to
1282 // get and parse the target attribute so we can get the cpu for
1283 // the function.
1284 TargetAttr::ParsedTargetAttr ParsedAttr = TD->parse();
1285 if (ParsedAttr.Architecture != "" &&
1286 getTarget().isValidCPUName(ParsedAttr.Architecture))
1287 TargetCPU = ParsedAttr.Architecture;
1288 } else {
1289 // Otherwise just add the existing target cpu and target features to the
1290 // function.
1291 Features = getTarget().getTargetOpts().Features;
1292 }
1293
1294 if (TargetCPU != "") {
1295 Attrs.addAttribute("target-cpu", TargetCPU);
1296 AddedAttr = true;
1297 }
1298 if (!Features.empty()) {
1299 std::sort(Features.begin(), Features.end());
1300 Attrs.addAttribute("target-features", llvm::join(Features, ","));
1301 AddedAttr = true;
1302 }
1303
1304 return AddedAttr;
1305}
1306
1307void CodeGenModule::setNonAliasAttributes(const Decl *D,
1308 llvm::GlobalObject *GO) {
1309 SetCommonAttributes(D, GO);
1310
1311 if (D) {
1312 if (auto *GV = dyn_cast<llvm::GlobalVariable>(GO)) {
1313 if (auto *SA = D->getAttr<PragmaClangBSSSectionAttr>())
1314 GV->addAttribute("bss-section", SA->getName());
1315 if (auto *SA = D->getAttr<PragmaClangDataSectionAttr>())
1316 GV->addAttribute("data-section", SA->getName());
1317 if (auto *SA = D->getAttr<PragmaClangRodataSectionAttr>())
1318 GV->addAttribute("rodata-section", SA->getName());
1319 }
1320
1321 if (auto *F = dyn_cast<llvm::Function>(GO)) {
1322 if (auto *SA = D->getAttr<PragmaClangTextSectionAttr>())
1323 if (!D->getAttr<SectionAttr>())
1324 F->addFnAttr("implicit-section-name", SA->getName());
1325
1326 llvm::AttrBuilder Attrs;
1327 if (GetCPUAndFeaturesAttributes(D, Attrs)) {
1328 // We know that GetCPUAndFeaturesAttributes will always have the
1329 // newest set, since it has the newest possible FunctionDecl, so the
1330 // new ones should replace the old.
1331 F->removeFnAttr("target-cpu");
1332 F->removeFnAttr("target-features");
1333 F->addAttributes(llvm::AttributeList::FunctionIndex, Attrs);
1334 }
1335 }
1336
1337 if (const SectionAttr *SA = D->getAttr<SectionAttr>())
1338 GO->setSection(SA->getName());
1339 }
1340
1341 getTargetCodeGenInfo().setTargetAttributes(D, GO, *this);
1342}
1343
1344void CodeGenModule::SetInternalFunctionAttributes(const Decl *D,
1345 llvm::Function *F,
1346 const CGFunctionInfo &FI) {
1347 SetLLVMFunctionAttributes(D, FI, F);
1348 SetLLVMFunctionAttributesForDefinition(D, F);
1349
1350 F->setLinkage(llvm::Function::InternalLinkage);
1351
1352 setNonAliasAttributes(D, F);
1353}
1354
1355static void setLinkageForGV(llvm::GlobalValue *GV,
1356 const NamedDecl *ND) {
1357 // Set linkage and visibility in case we never see a definition.
1358 LinkageInfo LV = ND->getLinkageAndVisibility();
1359 if (!isExternallyVisible(LV.getLinkage())) {
1360 // Don't set internal linkage on declarations.
1361 } else {
1362 if (ND->hasAttr<DLLImportAttr>()) {
1363 GV->setLinkage(llvm::GlobalValue::ExternalLinkage);
1364 GV->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
1365 } else if (ND->hasAttr<DLLExportAttr>()) {
1366 GV->setLinkage(llvm::GlobalValue::ExternalLinkage);
1367 } else if (ND->hasAttr<WeakAttr>() || ND->isWeakImported()) {
1368 // "extern_weak" is overloaded in LLVM; we probably should have
1369 // separate linkage types for this.
1370 GV->setLinkage(llvm::GlobalValue::ExternalWeakLinkage);
1371 }
1372 }
1373}
1374
1375void CodeGenModule::CreateFunctionTypeMetadata(const FunctionDecl *FD,
1376 llvm::Function *F) {
1377 // Only if we are checking indirect calls.
1378 if (!LangOpts.Sanitize.has(SanitizerKind::CFIICall))
1379 return;
1380
1381 // Non-static class methods are handled via vtable pointer checks elsewhere.
1382 if (isa<CXXMethodDecl>(FD) && !cast<CXXMethodDecl>(FD)->isStatic())
1383 return;
1384
1385 // Additionally, if building with cross-DSO support...
1386 if (CodeGenOpts.SanitizeCfiCrossDso) {
1387 // Skip available_externally functions. They won't be codegen'ed in the
1388 // current module anyway.
1389 if (getContext().GetGVALinkageForFunction(FD) == GVA_AvailableExternally)
1390 return;
1391 }
1392
1393 llvm::Metadata *MD = CreateMetadataIdentifierForType(FD->getType());
1394 F->addTypeMetadata(0, MD);
1395 F->addTypeMetadata(0, CreateMetadataIdentifierGeneralized(FD->getType()));
1396
1397 // Emit a hash-based bit set entry for cross-DSO calls.
1398 if (CodeGenOpts.SanitizeCfiCrossDso)
1399 if (auto CrossDsoTypeId = CreateCrossDsoCfiTypeId(MD))
1400 F->addTypeMetadata(0, llvm::ConstantAsMetadata::get(CrossDsoTypeId));
1401}
1402
1403void CodeGenModule::SetFunctionAttributes(GlobalDecl GD, llvm::Function *F,
1404 bool IsIncompleteFunction,
1405 bool IsThunk) {
1406
1407 if (llvm::Intrinsic::ID IID = F->getIntrinsicID()) {
1408 // If this is an intrinsic function, set the function's attributes
1409 // to the intrinsic's attributes.
1410 F->setAttributes(llvm::Intrinsic::getAttributes(getLLVMContext(), IID));
1411 return;
1412 }
1413
1414 const auto *FD = cast<FunctionDecl>(GD.getDecl());
1415
1416 if (!IsIncompleteFunction) {
1417 SetLLVMFunctionAttributes(FD, getTypes().arrangeGlobalDeclaration(GD), F);
1418 // Setup target-specific attributes.
1419 if (F->isDeclaration())
1420 getTargetCodeGenInfo().setTargetAttributes(FD, F, *this);
1421 }
1422
1423 // Add the Returned attribute for "this", except for iOS 5 and earlier
1424 // where substantial code, including the libstdc++ dylib, was compiled with
1425 // GCC and does not actually return "this".
1426 if (!IsThunk && getCXXABI().HasThisReturn(GD) &&
1427 !(getTriple().isiOS() && getTriple().isOSVersionLT(6))) {
1428 assert(!F->arg_empty() &&(static_cast <bool> (!F->arg_empty() && F->
arg_begin()->getType() ->canLosslesslyBitCastTo(F->getReturnType
()) && "unexpected this return") ? void (0) : __assert_fail
("!F->arg_empty() && F->arg_begin()->getType() ->canLosslesslyBitCastTo(F->getReturnType()) && \"unexpected this return\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1431, __extension__ __PRETTY_FUNCTION__))
1429 F->arg_begin()->getType()(static_cast <bool> (!F->arg_empty() && F->
arg_begin()->getType() ->canLosslesslyBitCastTo(F->getReturnType
()) && "unexpected this return") ? void (0) : __assert_fail
("!F->arg_empty() && F->arg_begin()->getType() ->canLosslesslyBitCastTo(F->getReturnType()) && \"unexpected this return\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1431, __extension__ __PRETTY_FUNCTION__))
1430 ->canLosslesslyBitCastTo(F->getReturnType()) &&(static_cast <bool> (!F->arg_empty() && F->
arg_begin()->getType() ->canLosslesslyBitCastTo(F->getReturnType
()) && "unexpected this return") ? void (0) : __assert_fail
("!F->arg_empty() && F->arg_begin()->getType() ->canLosslesslyBitCastTo(F->getReturnType()) && \"unexpected this return\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1431, __extension__ __PRETTY_FUNCTION__))
1431 "unexpected this return")(static_cast <bool> (!F->arg_empty() && F->
arg_begin()->getType() ->canLosslesslyBitCastTo(F->getReturnType
()) && "unexpected this return") ? void (0) : __assert_fail
("!F->arg_empty() && F->arg_begin()->getType() ->canLosslesslyBitCastTo(F->getReturnType()) && \"unexpected this return\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1431, __extension__ __PRETTY_FUNCTION__))
;
1432 F->addAttribute(1, llvm::Attribute::Returned);
1433 }
1434
1435 // Only a few attributes are set on declarations; these may later be
1436 // overridden by a definition.
1437
1438 setLinkageForGV(F, FD);
1439 setGVProperties(F, FD);
1440
1441 if (FD->getAttr<PragmaClangTextSectionAttr>()) {
1442 F->addFnAttr("implicit-section-name");
1443 }
1444
1445 if (const SectionAttr *SA = FD->getAttr<SectionAttr>())
1446 F->setSection(SA->getName());
1447
1448 if (FD->isReplaceableGlobalAllocationFunction()) {
1449 // A replaceable global allocation function does not act like a builtin by
1450 // default, only if it is invoked by a new-expression or delete-expression.
1451 F->addAttribute(llvm::AttributeList::FunctionIndex,
1452 llvm::Attribute::NoBuiltin);
1453
1454 // A sane operator new returns a non-aliasing pointer.
1455 // FIXME: Also add NonNull attribute to the return value
1456 // for the non-nothrow forms?
1457 auto Kind = FD->getDeclName().getCXXOverloadedOperator();
1458 if (getCodeGenOpts().AssumeSaneOperatorNew &&
1459 (Kind == OO_New || Kind == OO_Array_New))
1460 F->addAttribute(llvm::AttributeList::ReturnIndex,
1461 llvm::Attribute::NoAlias);
1462 }
1463
1464 if (isa<CXXConstructorDecl>(FD) || isa<CXXDestructorDecl>(FD))
1465 F->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1466 else if (const auto *MD = dyn_cast<CXXMethodDecl>(FD))
1467 if (MD->isVirtual())
1468 F->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1469
1470 // Don't emit entries for function declarations in the cross-DSO mode. This
1471 // is handled with better precision by the receiving DSO.
1472 if (!CodeGenOpts.SanitizeCfiCrossDso)
1473 CreateFunctionTypeMetadata(FD, F);
1474
1475 if (getLangOpts().OpenMP && FD->hasAttr<OMPDeclareSimdDeclAttr>())
1476 getOpenMPRuntime().emitDeclareSimdFunction(FD, F);
1477}
1478
1479void CodeGenModule::addUsedGlobal(llvm::GlobalValue *GV) {
1480 assert(!GV->isDeclaration() &&(static_cast <bool> (!GV->isDeclaration() &&
"Only globals with definition can force usage.") ? void (0) :
__assert_fail ("!GV->isDeclaration() && \"Only globals with definition can force usage.\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1481, __extension__ __PRETTY_FUNCTION__))
1481 "Only globals with definition can force usage.")(static_cast <bool> (!GV->isDeclaration() &&
"Only globals with definition can force usage.") ? void (0) :
__assert_fail ("!GV->isDeclaration() && \"Only globals with definition can force usage.\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1481, __extension__ __PRETTY_FUNCTION__))
;
1482 LLVMUsed.emplace_back(GV);
1483}
1484
1485void CodeGenModule::addCompilerUsedGlobal(llvm::GlobalValue *GV) {
1486 assert(!GV->isDeclaration() &&(static_cast <bool> (!GV->isDeclaration() &&
"Only globals with definition can force usage.") ? void (0) :
__assert_fail ("!GV->isDeclaration() && \"Only globals with definition can force usage.\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1487, __extension__ __PRETTY_FUNCTION__))
1487 "Only globals with definition can force usage.")(static_cast <bool> (!GV->isDeclaration() &&
"Only globals with definition can force usage.") ? void (0) :
__assert_fail ("!GV->isDeclaration() && \"Only globals with definition can force usage.\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1487, __extension__ __PRETTY_FUNCTION__))
;
1488 LLVMCompilerUsed.emplace_back(GV);
1489}
1490
1491static void emitUsed(CodeGenModule &CGM, StringRef Name,
1492 std::vector<llvm::WeakTrackingVH> &List) {
1493 // Don't create llvm.used if there is no need.
1494 if (List.empty())
1495 return;
1496
1497 // Convert List to what ConstantArray needs.
1498 SmallVector<llvm::Constant*, 8> UsedArray;
1499 UsedArray.resize(List.size());
1500 for (unsigned i = 0, e = List.size(); i != e; ++i) {
1501 UsedArray[i] =
1502 llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(
1503 cast<llvm::Constant>(&*List[i]), CGM.Int8PtrTy);
1504 }
1505
1506 if (UsedArray.empty())
1507 return;
1508 llvm::ArrayType *ATy = llvm::ArrayType::get(CGM.Int8PtrTy, UsedArray.size());
1509
1510 auto *GV = new llvm::GlobalVariable(
1511 CGM.getModule(), ATy, false, llvm::GlobalValue::AppendingLinkage,
1512 llvm::ConstantArray::get(ATy, UsedArray), Name);
1513
1514 GV->setSection("llvm.metadata");
1515}
1516
1517void CodeGenModule::emitLLVMUsed() {
1518 emitUsed(*this, "llvm.used", LLVMUsed);
1519 emitUsed(*this, "llvm.compiler.used", LLVMCompilerUsed);
1520}
1521
1522void CodeGenModule::AppendLinkerOptions(StringRef Opts) {
1523 auto *MDOpts = llvm::MDString::get(getLLVMContext(), Opts);
1524 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
1525}
1526
1527void CodeGenModule::AddDetectMismatch(StringRef Name, StringRef Value) {
1528 llvm::SmallString<32> Opt;
1529 getTargetCodeGenInfo().getDetectMismatchOption(Name, Value, Opt);
1530 auto *MDOpts = llvm::MDString::get(getLLVMContext(), Opt);
1531 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
1532}
1533
1534void CodeGenModule::AddELFLibDirective(StringRef Lib) {
1535 auto &C = getLLVMContext();
1536 LinkerOptionsMetadata.push_back(llvm::MDNode::get(
1537 C, {llvm::MDString::get(C, "lib"), llvm::MDString::get(C, Lib)}));
1538}
1539
1540void CodeGenModule::AddDependentLib(StringRef Lib) {
1541 llvm::SmallString<24> Opt;
1542 getTargetCodeGenInfo().getDependentLibraryOption(Lib, Opt);
1543 auto *MDOpts = llvm::MDString::get(getLLVMContext(), Opt);
1544 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
1545}
1546
1547/// \brief Add link options implied by the given module, including modules
1548/// it depends on, using a postorder walk.
1549static void addLinkOptionsPostorder(CodeGenModule &CGM, Module *Mod,
1550 SmallVectorImpl<llvm::MDNode *> &Metadata,
1551 llvm::SmallPtrSet<Module *, 16> &Visited) {
1552 // Import this module's parent.
1553 if (Mod->Parent && Visited.insert(Mod->Parent).second) {
1554 addLinkOptionsPostorder(CGM, Mod->Parent, Metadata, Visited);
1555 }
1556
1557 // Import this module's dependencies.
1558 for (unsigned I = Mod->Imports.size(); I > 0; --I) {
1559 if (Visited.insert(Mod->Imports[I - 1]).second)
1560 addLinkOptionsPostorder(CGM, Mod->Imports[I-1], Metadata, Visited);
1561 }
1562
1563 // Add linker options to link against the libraries/frameworks
1564 // described by this module.
1565 llvm::LLVMContext &Context = CGM.getLLVMContext();
1566 for (unsigned I = Mod->LinkLibraries.size(); I > 0; --I) {
1567 // Link against a framework. Frameworks are currently Darwin only, so we
1568 // don't to ask TargetCodeGenInfo for the spelling of the linker option.
1569 if (Mod->LinkLibraries[I-1].IsFramework) {
1570 llvm::Metadata *Args[2] = {
1571 llvm::MDString::get(Context, "-framework"),
1572 llvm::MDString::get(Context, Mod->LinkLibraries[I - 1].Library)};
1573
1574 Metadata.push_back(llvm::MDNode::get(Context, Args));
1575 continue;
1576 }
1577
1578 // Link against a library.
1579 llvm::SmallString<24> Opt;
1580 CGM.getTargetCodeGenInfo().getDependentLibraryOption(
1581 Mod->LinkLibraries[I-1].Library, Opt);
1582 auto *OptString = llvm::MDString::get(Context, Opt);
1583 Metadata.push_back(llvm::MDNode::get(Context, OptString));
1584 }
1585}
1586
1587void CodeGenModule::EmitModuleLinkOptions() {
1588 // Collect the set of all of the modules we want to visit to emit link
1589 // options, which is essentially the imported modules and all of their
1590 // non-explicit child modules.
1591 llvm::SetVector<clang::Module *> LinkModules;
1592 llvm::SmallPtrSet<clang::Module *, 16> Visited;
1593 SmallVector<clang::Module *, 16> Stack;
1594
1595 // Seed the stack with imported modules.
1596 for (Module *M : ImportedModules) {
1597 // Do not add any link flags when an implementation TU of a module imports
1598 // a header of that same module.
1599 if (M->getTopLevelModuleName() == getLangOpts().CurrentModule &&
1600 !getLangOpts().isCompilingModule())
1601 continue;
1602 if (Visited.insert(M).second)
1603 Stack.push_back(M);
1604 }
1605
1606 // Find all of the modules to import, making a little effort to prune
1607 // non-leaf modules.
1608 while (!Stack.empty()) {
1609 clang::Module *Mod = Stack.pop_back_val();
1610
1611 bool AnyChildren = false;
1612
1613 // Visit the submodules of this module.
1614 for (clang::Module::submodule_iterator Sub = Mod->submodule_begin(),
1615 SubEnd = Mod->submodule_end();
1616 Sub != SubEnd; ++Sub) {
1617 // Skip explicit children; they need to be explicitly imported to be
1618 // linked against.
1619 if ((*Sub)->IsExplicit)
1620 continue;
1621
1622 if (Visited.insert(*Sub).second) {
1623 Stack.push_back(*Sub);
1624 AnyChildren = true;
1625 }
1626 }
1627
1628 // We didn't find any children, so add this module to the list of
1629 // modules to link against.
1630 if (!AnyChildren) {
1631 LinkModules.insert(Mod);
1632 }
1633 }
1634
1635 // Add link options for all of the imported modules in reverse topological
1636 // order. We don't do anything to try to order import link flags with respect
1637 // to linker options inserted by things like #pragma comment().
1638 SmallVector<llvm::MDNode *, 16> MetadataArgs;
1639 Visited.clear();
1640 for (Module *M : LinkModules)
1641 if (Visited.insert(M).second)
1642 addLinkOptionsPostorder(*this, M, MetadataArgs, Visited);
1643 std::reverse(MetadataArgs.begin(), MetadataArgs.end());
1644 LinkerOptionsMetadata.append(MetadataArgs.begin(), MetadataArgs.end());
1645
1646 // Add the linker options metadata flag.
1647 auto *NMD = getModule().getOrInsertNamedMetadata("llvm.linker.options");
1648 for (auto *MD : LinkerOptionsMetadata)
1649 NMD->addOperand(MD);
1650}
1651
1652void CodeGenModule::EmitDeferred() {
1653 // Emit code for any potentially referenced deferred decls. Since a
1654 // previously unused static decl may become used during the generation of code
1655 // for a static function, iterate until no changes are made.
1656
1657 if (!DeferredVTables.empty()) {
1658 EmitDeferredVTables();
1659
1660 // Emitting a vtable doesn't directly cause more vtables to
1661 // become deferred, although it can cause functions to be
1662 // emitted that then need those vtables.
1663 assert(DeferredVTables.empty())(static_cast <bool> (DeferredVTables.empty()) ? void (0
) : __assert_fail ("DeferredVTables.empty()", "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1663, __extension__ __PRETTY_FUNCTION__))
;
1664 }
1665
1666 // Stop if we're out of both deferred vtables and deferred declarations.
1667 if (DeferredDeclsToEmit.empty())
1668 return;
1669
1670 // Grab the list of decls to emit. If EmitGlobalDefinition schedules more
1671 // work, it will not interfere with this.
1672 std::vector<GlobalDecl> CurDeclsToEmit;
1673 CurDeclsToEmit.swap(DeferredDeclsToEmit);
1674
1675 for (GlobalDecl &D : CurDeclsToEmit) {
1676 // We should call GetAddrOfGlobal with IsForDefinition set to true in order
1677 // to get GlobalValue with exactly the type we need, not something that
1678 // might had been created for another decl with the same mangled name but
1679 // different type.
1680 llvm::GlobalValue *GV = dyn_cast<llvm::GlobalValue>(
1681 GetAddrOfGlobal(D, ForDefinition));
1682
1683 // In case of different address spaces, we may still get a cast, even with
1684 // IsForDefinition equal to true. Query mangled names table to get
1685 // GlobalValue.
1686 if (!GV)
1687 GV = GetGlobalValue(getMangledName(D));
1688
1689 // Make sure GetGlobalValue returned non-null.
1690 assert(GV)(static_cast <bool> (GV) ? void (0) : __assert_fail ("GV"
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1690, __extension__ __PRETTY_FUNCTION__))
;
1691
1692 // Check to see if we've already emitted this. This is necessary
1693 // for a couple of reasons: first, decls can end up in the
1694 // deferred-decls queue multiple times, and second, decls can end
1695 // up with definitions in unusual ways (e.g. by an extern inline
1696 // function acquiring a strong function redefinition). Just
1697 // ignore these cases.
1698 if (!GV->isDeclaration())
1699 continue;
1700
1701 // Otherwise, emit the definition and move on to the next one.
1702 EmitGlobalDefinition(D, GV);
1703
1704 // If we found out that we need to emit more decls, do that recursively.
1705 // This has the advantage that the decls are emitted in a DFS and related
1706 // ones are close together, which is convenient for testing.
1707 if (!DeferredVTables.empty() || !DeferredDeclsToEmit.empty()) {
1708 EmitDeferred();
1709 assert(DeferredVTables.empty() && DeferredDeclsToEmit.empty())(static_cast <bool> (DeferredVTables.empty() &&
DeferredDeclsToEmit.empty()) ? void (0) : __assert_fail ("DeferredVTables.empty() && DeferredDeclsToEmit.empty()"
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1709, __extension__ __PRETTY_FUNCTION__))
;
1710 }
1711 }
1712}
1713
1714void CodeGenModule::EmitVTablesOpportunistically() {
1715 // Try to emit external vtables as available_externally if they have emitted
1716 // all inlined virtual functions. It runs after EmitDeferred() and therefore
1717 // is not allowed to create new references to things that need to be emitted
1718 // lazily. Note that it also uses fact that we eagerly emitting RTTI.
1719
1720 assert((OpportunisticVTables.empty() || shouldOpportunisticallyEmitVTables())(static_cast <bool> ((OpportunisticVTables.empty() || shouldOpportunisticallyEmitVTables
()) && "Only emit opportunistic vtables with optimizations"
) ? void (0) : __assert_fail ("(OpportunisticVTables.empty() || shouldOpportunisticallyEmitVTables()) && \"Only emit opportunistic vtables with optimizations\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1721, __extension__ __PRETTY_FUNCTION__))
1721 && "Only emit opportunistic vtables with optimizations")(static_cast <bool> ((OpportunisticVTables.empty() || shouldOpportunisticallyEmitVTables
()) && "Only emit opportunistic vtables with optimizations"
) ? void (0) : __assert_fail ("(OpportunisticVTables.empty() || shouldOpportunisticallyEmitVTables()) && \"Only emit opportunistic vtables with optimizations\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1721, __extension__ __PRETTY_FUNCTION__))
;
1722
1723 for (const CXXRecordDecl *RD : OpportunisticVTables) {
1724 assert(getVTables().isVTableExternal(RD) &&(static_cast <bool> (getVTables().isVTableExternal(RD) &&
"This queue should only contain external vtables") ? void (0
) : __assert_fail ("getVTables().isVTableExternal(RD) && \"This queue should only contain external vtables\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1725, __extension__ __PRETTY_FUNCTION__))
1725 "This queue should only contain external vtables")(static_cast <bool> (getVTables().isVTableExternal(RD) &&
"This queue should only contain external vtables") ? void (0
) : __assert_fail ("getVTables().isVTableExternal(RD) && \"This queue should only contain external vtables\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1725, __extension__ __PRETTY_FUNCTION__))
;
1726 if (getCXXABI().canSpeculativelyEmitVTable(RD))
1727 VTables.GenerateClassData(RD);
1728 }
1729 OpportunisticVTables.clear();
1730}
1731
1732void CodeGenModule::EmitGlobalAnnotations() {
1733 if (Annotations.empty())
1734 return;
1735
1736 // Create a new global variable for the ConstantStruct in the Module.
1737 llvm::Constant *Array = llvm::ConstantArray::get(llvm::ArrayType::get(
1738 Annotations[0]->getType(), Annotations.size()), Annotations);
1739 auto *gv = new llvm::GlobalVariable(getModule(), Array->getType(), false,
1740 llvm::GlobalValue::AppendingLinkage,
1741 Array, "llvm.global.annotations");
1742 gv->setSection(AnnotationSection);
1743}
1744
1745llvm::Constant *CodeGenModule::EmitAnnotationString(StringRef Str) {
1746 llvm::Constant *&AStr = AnnotationStrings[Str];
1747 if (AStr)
1748 return AStr;
1749
1750 // Not found yet, create a new global.
1751 llvm::Constant *s = llvm::ConstantDataArray::getString(getLLVMContext(), Str);
1752 auto *gv =
1753 new llvm::GlobalVariable(getModule(), s->getType(), true,
1754 llvm::GlobalValue::PrivateLinkage, s, ".str");
1755 gv->setSection(AnnotationSection);
1756 gv->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1757 AStr = gv;
1758 return gv;
1759}
1760
1761llvm::Constant *CodeGenModule::EmitAnnotationUnit(SourceLocation Loc) {
1762 SourceManager &SM = getContext().getSourceManager();
1763 PresumedLoc PLoc = SM.getPresumedLoc(Loc);
1764 if (PLoc.isValid())
1765 return EmitAnnotationString(PLoc.getFilename());
1766 return EmitAnnotationString(SM.getBufferName(Loc));
1767}
1768
1769llvm::Constant *CodeGenModule::EmitAnnotationLineNo(SourceLocation L) {
1770 SourceManager &SM = getContext().getSourceManager();
1771 PresumedLoc PLoc = SM.getPresumedLoc(L);
1772 unsigned LineNo = PLoc.isValid() ? PLoc.getLine() :
1773 SM.getExpansionLineNumber(L);
1774 return llvm::ConstantInt::get(Int32Ty, LineNo);
1775}
1776
1777llvm::Constant *CodeGenModule::EmitAnnotateAttr(llvm::GlobalValue *GV,
1778 const AnnotateAttr *AA,
1779 SourceLocation L) {
1780 // Get the globals for file name, annotation, and the line number.
1781 llvm::Constant *AnnoGV = EmitAnnotationString(AA->getAnnotation()),
1782 *UnitGV = EmitAnnotationUnit(L),
1783 *LineNoCst = EmitAnnotationLineNo(L);
1784
1785 // Create the ConstantStruct for the global annotation.
1786 llvm::Constant *Fields[4] = {
1787 llvm::ConstantExpr::getBitCast(GV, Int8PtrTy),
1788 llvm::ConstantExpr::getBitCast(AnnoGV, Int8PtrTy),
1789 llvm::ConstantExpr::getBitCast(UnitGV, Int8PtrTy),
1790 LineNoCst
1791 };
1792 return llvm::ConstantStruct::getAnon(Fields);
1793}
1794
1795void CodeGenModule::AddGlobalAnnotations(const ValueDecl *D,
1796 llvm::GlobalValue *GV) {
1797 assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute")(static_cast <bool> (D->hasAttr<AnnotateAttr>(
) && "no annotate attribute") ? void (0) : __assert_fail
("D->hasAttr<AnnotateAttr>() && \"no annotate attribute\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1797, __extension__ __PRETTY_FUNCTION__))
;
1798 // Get the struct elements for these annotations.
1799 for (const auto *I : D->specific_attrs<AnnotateAttr>())
1800 Annotations.push_back(EmitAnnotateAttr(GV, I, D->getLocation()));
1801}
1802
1803bool CodeGenModule::isInSanitizerBlacklist(SanitizerMask Kind,
1804 llvm::Function *Fn,
1805 SourceLocation Loc) const {
1806 const auto &SanitizerBL = getContext().getSanitizerBlacklist();
1807 // Blacklist by function name.
1808 if (SanitizerBL.isBlacklistedFunction(Kind, Fn->getName()))
1809 return true;
1810 // Blacklist by location.
1811 if (Loc.isValid())
1812 return SanitizerBL.isBlacklistedLocation(Kind, Loc);
1813 // If location is unknown, this may be a compiler-generated function. Assume
1814 // it's located in the main file.
1815 auto &SM = Context.getSourceManager();
1816 if (const auto *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
1817 return SanitizerBL.isBlacklistedFile(Kind, MainFile->getName());
1818 }
1819 return false;
1820}
1821
1822bool CodeGenModule::isInSanitizerBlacklist(llvm::GlobalVariable *GV,
1823 SourceLocation Loc, QualType Ty,
1824 StringRef Category) const {
1825 // For now globals can be blacklisted only in ASan and KASan.
1826 const SanitizerMask EnabledAsanMask = LangOpts.Sanitize.Mask &
1827 (SanitizerKind::Address | SanitizerKind::KernelAddress | SanitizerKind::HWAddress);
1828 if (!EnabledAsanMask)
1829 return false;
1830 const auto &SanitizerBL = getContext().getSanitizerBlacklist();
1831 if (SanitizerBL.isBlacklistedGlobal(EnabledAsanMask, GV->getName(), Category))
1832 return true;
1833 if (SanitizerBL.isBlacklistedLocation(EnabledAsanMask, Loc, Category))
1834 return true;
1835 // Check global type.
1836 if (!Ty.isNull()) {
1837 // Drill down the array types: if global variable of a fixed type is
1838 // blacklisted, we also don't instrument arrays of them.
1839 while (auto AT = dyn_cast<ArrayType>(Ty.getTypePtr()))
1840 Ty = AT->getElementType();
1841 Ty = Ty.getCanonicalType().getUnqualifiedType();
1842 // We allow to blacklist only record types (classes, structs etc.)
1843 if (Ty->isRecordType()) {
1844 std::string TypeStr = Ty.getAsString(getContext().getPrintingPolicy());
1845 if (SanitizerBL.isBlacklistedType(EnabledAsanMask, TypeStr, Category))
1846 return true;
1847 }
1848 }
1849 return false;
1850}
1851
1852bool CodeGenModule::imbueXRayAttrs(llvm::Function *Fn, SourceLocation Loc,
1853 StringRef Category) const {
1854 if (!LangOpts.XRayInstrument)
1855 return false;
1856 const auto &XRayFilter = getContext().getXRayFilter();
1857 using ImbueAttr = XRayFunctionFilter::ImbueAttribute;
1858 auto Attr = XRayFunctionFilter::ImbueAttribute::NONE;
1859 if (Loc.isValid())
1860 Attr = XRayFilter.shouldImbueLocation(Loc, Category);
1861 if (Attr == ImbueAttr::NONE)
1862 Attr = XRayFilter.shouldImbueFunction(Fn->getName());
1863 switch (Attr) {
1864 case ImbueAttr::NONE:
1865 return false;
1866 case ImbueAttr::ALWAYS:
1867 Fn->addFnAttr("function-instrument", "xray-always");
1868 break;
1869 case ImbueAttr::ALWAYS_ARG1:
1870 Fn->addFnAttr("function-instrument", "xray-always");
1871 Fn->addFnAttr("xray-log-args", "1");
1872 break;
1873 case ImbueAttr::NEVER:
1874 Fn->addFnAttr("function-instrument", "xray-never");
1875 break;
1876 }
1877 return true;
1878}
1879
1880bool CodeGenModule::MustBeEmitted(const ValueDecl *Global) {
1881 // Never defer when EmitAllDecls is specified.
1882 if (LangOpts.EmitAllDecls)
1883 return true;
1884
1885 return getContext().DeclMustBeEmitted(Global);
1886}
1887
1888bool CodeGenModule::MayBeEmittedEagerly(const ValueDecl *Global) {
1889 if (const auto *FD = dyn_cast<FunctionDecl>(Global))
1890 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
1891 // Implicit template instantiations may change linkage if they are later
1892 // explicitly instantiated, so they should not be emitted eagerly.
1893 return false;
1894 if (const auto *VD = dyn_cast<VarDecl>(Global))
1895 if (Context.getInlineVariableDefinitionKind(VD) ==
1896 ASTContext::InlineVariableDefinitionKind::WeakUnknown)
1897 // A definition of an inline constexpr static data member may change
1898 // linkage later if it's redeclared outside the class.
1899 return false;
1900 // If OpenMP is enabled and threadprivates must be generated like TLS, delay
1901 // codegen for global variables, because they may be marked as threadprivate.
1902 if (LangOpts.OpenMP && LangOpts.OpenMPUseTLS &&
1903 getContext().getTargetInfo().isTLSSupported() && isa<VarDecl>(Global))
1904 return false;
1905
1906 return true;
1907}
1908
1909ConstantAddress CodeGenModule::GetAddrOfUuidDescriptor(
1910 const CXXUuidofExpr* E) {
1911 // Sema has verified that IIDSource has a __declspec(uuid()), and that its
1912 // well-formed.
1913 StringRef Uuid = E->getUuidStr();
1914 std::string Name = "_GUID_" + Uuid.lower();
1915 std::replace(Name.begin(), Name.end(), '-', '_');
1916
1917 // The UUID descriptor should be pointer aligned.
1918 CharUnits Alignment = CharUnits::fromQuantity(PointerAlignInBytes);
1919
1920 // Look for an existing global.
1921 if (llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name))
1922 return ConstantAddress(GV, Alignment);
1923
1924 llvm::Constant *Init = EmitUuidofInitializer(Uuid);
1925 assert(Init && "failed to initialize as constant")(static_cast <bool> (Init && "failed to initialize as constant"
) ? void (0) : __assert_fail ("Init && \"failed to initialize as constant\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1925, __extension__ __PRETTY_FUNCTION__))
;
1926
1927 auto *GV = new llvm::GlobalVariable(
1928 getModule(), Init->getType(),
1929 /*isConstant=*/true, llvm::GlobalValue::LinkOnceODRLinkage, Init, Name);
1930 if (supportsCOMDAT())
1931 GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
1932 return ConstantAddress(GV, Alignment);
1933}
1934
1935ConstantAddress CodeGenModule::GetWeakRefReference(const ValueDecl *VD) {
1936 const AliasAttr *AA = VD->getAttr<AliasAttr>();
1937 assert(AA && "No alias?")(static_cast <bool> (AA && "No alias?") ? void (
0) : __assert_fail ("AA && \"No alias?\"", "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 1937, __extension__ __PRETTY_FUNCTION__))
;
1938
1939 CharUnits Alignment = getContext().getDeclAlign(VD);
1940 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(VD->getType());
1941
1942 // See if there is already something with the target's name in the module.
1943 llvm::GlobalValue *Entry = GetGlobalValue(AA->getAliasee());
1944 if (Entry) {
1945 unsigned AS = getContext().getTargetAddressSpace(VD->getType());
1946 auto Ptr = llvm::ConstantExpr::getBitCast(Entry, DeclTy->getPointerTo(AS));
1947 return ConstantAddress(Ptr, Alignment);
1948 }
1949
1950 llvm::Constant *Aliasee;
1951 if (isa<llvm::FunctionType>(DeclTy))
1952 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy,
1953 GlobalDecl(cast<FunctionDecl>(VD)),
1954 /*ForVTable=*/false);
1955 else
1956 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
1957 llvm::PointerType::getUnqual(DeclTy),
1958 nullptr);
1959
1960 auto *F = cast<llvm::GlobalValue>(Aliasee);
1961 F->setLinkage(llvm::Function::ExternalWeakLinkage);
1962 WeakRefReferences.insert(F);
1963
1964 return ConstantAddress(Aliasee, Alignment);
1965}
1966
1967void CodeGenModule::EmitGlobal(GlobalDecl GD) {
1968 const auto *Global = cast<ValueDecl>(GD.getDecl());
1969
1970 // Weak references don't produce any output by themselves.
1971 if (Global->hasAttr<WeakRefAttr>())
1972 return;
1973
1974 // If this is an alias definition (which otherwise looks like a declaration)
1975 // emit it now.
1976 if (Global->hasAttr<AliasAttr>())
1977 return EmitAliasDefinition(GD);
1978
1979 // IFunc like an alias whose value is resolved at runtime by calling resolver.
1980 if (Global->hasAttr<IFuncAttr>())
1981 return emitIFuncDefinition(GD);
1982
1983 // If this is CUDA, be selective about which declarations we emit.
1984 if (LangOpts.CUDA) {
1985 if (LangOpts.CUDAIsDevice) {
1986 if (!Global->hasAttr<CUDADeviceAttr>() &&
1987 !Global->hasAttr<CUDAGlobalAttr>() &&
1988 !Global->hasAttr<CUDAConstantAttr>() &&
1989 !Global->hasAttr<CUDASharedAttr>())
1990 return;
1991 } else {
1992 // We need to emit host-side 'shadows' for all global
1993 // device-side variables because the CUDA runtime needs their
1994 // size and host-side address in order to provide access to
1995 // their device-side incarnations.
1996
1997 // So device-only functions are the only things we skip.
1998 if (isa<FunctionDecl>(Global) && !Global->hasAttr<CUDAHostAttr>() &&
1999 Global->hasAttr<CUDADeviceAttr>())
2000 return;
2001
2002 assert((isa<FunctionDecl>(Global) || isa<VarDecl>(Global)) &&(static_cast <bool> ((isa<FunctionDecl>(Global) ||
isa<VarDecl>(Global)) && "Expected Variable or Function"
) ? void (0) : __assert_fail ("(isa<FunctionDecl>(Global) || isa<VarDecl>(Global)) && \"Expected Variable or Function\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2003, __extension__ __PRETTY_FUNCTION__))
2003 "Expected Variable or Function")(static_cast <bool> ((isa<FunctionDecl>(Global) ||
isa<VarDecl>(Global)) && "Expected Variable or Function"
) ? void (0) : __assert_fail ("(isa<FunctionDecl>(Global) || isa<VarDecl>(Global)) && \"Expected Variable or Function\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2003, __extension__ __PRETTY_FUNCTION__))
;
2004 }
2005 }
2006
2007 if (LangOpts.OpenMP) {
2008 // If this is OpenMP device, check if it is legal to emit this global
2009 // normally.
2010 if (OpenMPRuntime && OpenMPRuntime->emitTargetGlobal(GD))
2011 return;
2012 if (auto *DRD = dyn_cast<OMPDeclareReductionDecl>(Global)) {
2013 if (MustBeEmitted(Global))
2014 EmitOMPDeclareReduction(DRD);
2015 return;
2016 }
2017 }
2018
2019 // Ignore declarations, they will be emitted on their first use.
2020 if (const auto *FD = dyn_cast<FunctionDecl>(Global)) {
2021 // Forward declarations are emitted lazily on first use.
2022 if (!FD->doesThisDeclarationHaveABody()) {
2023 if (!FD->doesDeclarationForceExternallyVisibleDefinition())
2024 return;
2025
2026 StringRef MangledName = getMangledName(GD);
2027
2028 // Compute the function info and LLVM type.
2029 const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
2030 llvm::Type *Ty = getTypes().GetFunctionType(FI);
2031
2032 GetOrCreateLLVMFunction(MangledName, Ty, GD, /*ForVTable=*/false,
2033 /*DontDefer=*/false);
2034 return;
2035 }
2036 } else {
2037 const auto *VD = cast<VarDecl>(Global);
2038 assert(VD->isFileVarDecl() && "Cannot emit local var decl as global.")(static_cast <bool> (VD->isFileVarDecl() && "Cannot emit local var decl as global."
) ? void (0) : __assert_fail ("VD->isFileVarDecl() && \"Cannot emit local var decl as global.\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2038, __extension__ __PRETTY_FUNCTION__))
;
2039 // We need to emit device-side global CUDA variables even if a
2040 // variable does not have a definition -- we still need to define
2041 // host-side shadow for it.
2042 bool MustEmitForCuda = LangOpts.CUDA && !LangOpts.CUDAIsDevice &&
2043 !VD->hasDefinition() &&
2044 (VD->hasAttr<CUDAConstantAttr>() ||
2045 VD->hasAttr<CUDADeviceAttr>());
2046 if (!MustEmitForCuda &&
2047 VD->isThisDeclarationADefinition() != VarDecl::Definition &&
2048 !Context.isMSStaticDataMemberInlineDefinition(VD)) {
2049 // If this declaration may have caused an inline variable definition to
2050 // change linkage, make sure that it's emitted.
2051 if (Context.getInlineVariableDefinitionKind(VD) ==
2052 ASTContext::InlineVariableDefinitionKind::Strong)
2053 GetAddrOfGlobalVar(VD);
2054 return;
2055 }
2056 }
2057
2058 // Defer code generation to first use when possible, e.g. if this is an inline
2059 // function. If the global must always be emitted, do it eagerly if possible
2060 // to benefit from cache locality.
2061 if (MustBeEmitted(Global) && MayBeEmittedEagerly(Global)) {
2062 // Emit the definition if it can't be deferred.
2063 EmitGlobalDefinition(GD);
2064 return;
2065 }
2066
2067 // If we're deferring emission of a C++ variable with an
2068 // initializer, remember the order in which it appeared in the file.
2069 if (getLangOpts().CPlusPlus && isa<VarDecl>(Global) &&
2070 cast<VarDecl>(Global)->hasInit()) {
2071 DelayedCXXInitPosition[Global] = CXXGlobalInits.size();
2072 CXXGlobalInits.push_back(nullptr);
2073 }
2074
2075 StringRef MangledName = getMangledName(GD);
2076 if (GetGlobalValue(MangledName) != nullptr) {
2077 // The value has already been used and should therefore be emitted.
2078 addDeferredDeclToEmit(GD);
2079 } else if (MustBeEmitted(Global)) {
2080 // The value must be emitted, but cannot be emitted eagerly.
2081 assert(!MayBeEmittedEagerly(Global))(static_cast <bool> (!MayBeEmittedEagerly(Global)) ? void
(0) : __assert_fail ("!MayBeEmittedEagerly(Global)", "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2081, __extension__ __PRETTY_FUNCTION__))
;
2082 addDeferredDeclToEmit(GD);
2083 } else {
2084 // Otherwise, remember that we saw a deferred decl with this name. The
2085 // first use of the mangled name will cause it to move into
2086 // DeferredDeclsToEmit.
2087 DeferredDecls[MangledName] = GD;
2088 }
2089}
2090
2091// Check if T is a class type with a destructor that's not dllimport.
2092static bool HasNonDllImportDtor(QualType T) {
2093 if (const auto *RT = T->getBaseElementTypeUnsafe()->getAs<RecordType>())
2094 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()))
2095 if (RD->getDestructor() && !RD->getDestructor()->hasAttr<DLLImportAttr>())
2096 return true;
2097
2098 return false;
2099}
2100
2101namespace {
2102 struct FunctionIsDirectlyRecursive :
2103 public RecursiveASTVisitor<FunctionIsDirectlyRecursive> {
2104 const StringRef Name;
2105 const Builtin::Context &BI;
2106 bool Result;
2107 FunctionIsDirectlyRecursive(StringRef N, const Builtin::Context &C) :
2108 Name(N), BI(C), Result(false) {
2109 }
2110 typedef RecursiveASTVisitor<FunctionIsDirectlyRecursive> Base;
2111
2112 bool TraverseCallExpr(CallExpr *E) {
2113 const FunctionDecl *FD = E->getDirectCallee();
2114 if (!FD)
2115 return true;
2116 AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
2117 if (Attr && Name == Attr->getLabel()) {
2118 Result = true;
2119 return false;
2120 }
2121 unsigned BuiltinID = FD->getBuiltinID();
2122 if (!BuiltinID || !BI.isLibFunction(BuiltinID))
2123 return true;
2124 StringRef BuiltinName = BI.getName(BuiltinID);
2125 if (BuiltinName.startswith("__builtin_") &&
2126 Name == BuiltinName.slice(strlen("__builtin_"), StringRef::npos)) {
2127 Result = true;
2128 return false;
2129 }
2130 return true;
2131 }
2132 };
2133
2134 // Make sure we're not referencing non-imported vars or functions.
2135 struct DLLImportFunctionVisitor
2136 : public RecursiveASTVisitor<DLLImportFunctionVisitor> {
2137 bool SafeToInline = true;
2138
2139 bool shouldVisitImplicitCode() const { return true; }
2140
2141 bool VisitVarDecl(VarDecl *VD) {
2142 if (VD->getTLSKind()) {
2143 // A thread-local variable cannot be imported.
2144 SafeToInline = false;
2145 return SafeToInline;
2146 }
2147
2148 // A variable definition might imply a destructor call.
2149 if (VD->isThisDeclarationADefinition())
2150 SafeToInline = !HasNonDllImportDtor(VD->getType());
2151
2152 return SafeToInline;
2153 }
2154
2155 bool VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) {
2156 if (const auto *D = E->getTemporary()->getDestructor())
2157 SafeToInline = D->hasAttr<DLLImportAttr>();
2158 return SafeToInline;
2159 }
2160
2161 bool VisitDeclRefExpr(DeclRefExpr *E) {
2162 ValueDecl *VD = E->getDecl();
2163 if (isa<FunctionDecl>(VD))
2164 SafeToInline = VD->hasAttr<DLLImportAttr>();
2165 else if (VarDecl *V = dyn_cast<VarDecl>(VD))
2166 SafeToInline = !V->hasGlobalStorage() || V->hasAttr<DLLImportAttr>();
2167 return SafeToInline;
2168 }
2169
2170 bool VisitCXXConstructExpr(CXXConstructExpr *E) {
2171 SafeToInline = E->getConstructor()->hasAttr<DLLImportAttr>();
2172 return SafeToInline;
2173 }
2174
2175 bool VisitCXXMemberCallExpr(CXXMemberCallExpr *E) {
2176 CXXMethodDecl *M = E->getMethodDecl();
2177 if (!M) {
2178 // Call through a pointer to member function. This is safe to inline.
2179 SafeToInline = true;
2180 } else {
2181 SafeToInline = M->hasAttr<DLLImportAttr>();
2182 }
2183 return SafeToInline;
2184 }
2185
2186 bool VisitCXXDeleteExpr(CXXDeleteExpr *E) {
2187 SafeToInline = E->getOperatorDelete()->hasAttr<DLLImportAttr>();
2188 return SafeToInline;
2189 }
2190
2191 bool VisitCXXNewExpr(CXXNewExpr *E) {
2192 SafeToInline = E->getOperatorNew()->hasAttr<DLLImportAttr>();
2193 return SafeToInline;
2194 }
2195 };
2196}
2197
2198// isTriviallyRecursive - Check if this function calls another
2199// decl that, because of the asm attribute or the other decl being a builtin,
2200// ends up pointing to itself.
2201bool
2202CodeGenModule::isTriviallyRecursive(const FunctionDecl *FD) {
2203 StringRef Name;
2204 if (getCXXABI().getMangleContext().shouldMangleDeclName(FD)) {
2205 // asm labels are a special kind of mangling we have to support.
2206 AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
2207 if (!Attr)
2208 return false;
2209 Name = Attr->getLabel();
2210 } else {
2211 Name = FD->getName();
2212 }
2213
2214 FunctionIsDirectlyRecursive Walker(Name, Context.BuiltinInfo);
2215 Walker.TraverseFunctionDecl(const_cast<FunctionDecl*>(FD));
2216 return Walker.Result;
2217}
2218
2219bool CodeGenModule::shouldEmitFunction(GlobalDecl GD) {
2220 if (getFunctionLinkage(GD) != llvm::Function::AvailableExternallyLinkage)
2221 return true;
2222 const auto *F = cast<FunctionDecl>(GD.getDecl());
2223 if (CodeGenOpts.OptimizationLevel == 0 && !F->hasAttr<AlwaysInlineAttr>())
2224 return false;
2225
2226 if (F->hasAttr<DLLImportAttr>()) {
2227 // Check whether it would be safe to inline this dllimport function.
2228 DLLImportFunctionVisitor Visitor;
2229 Visitor.TraverseFunctionDecl(const_cast<FunctionDecl*>(F));
2230 if (!Visitor.SafeToInline)
2231 return false;
2232
2233 if (const CXXDestructorDecl *Dtor = dyn_cast<CXXDestructorDecl>(F)) {
2234 // Implicit destructor invocations aren't captured in the AST, so the
2235 // check above can't see them. Check for them manually here.
2236 for (const Decl *Member : Dtor->getParent()->decls())
2237 if (isa<FieldDecl>(Member))
2238 if (HasNonDllImportDtor(cast<FieldDecl>(Member)->getType()))
2239 return false;
2240 for (const CXXBaseSpecifier &B : Dtor->getParent()->bases())
2241 if (HasNonDllImportDtor(B.getType()))
2242 return false;
2243 }
2244 }
2245
2246 // PR9614. Avoid cases where the source code is lying to us. An available
2247 // externally function should have an equivalent function somewhere else,
2248 // but a function that calls itself is clearly not equivalent to the real
2249 // implementation.
2250 // This happens in glibc's btowc and in some configure checks.
2251 return !isTriviallyRecursive(F);
2252}
2253
2254bool CodeGenModule::shouldOpportunisticallyEmitVTables() {
2255 return CodeGenOpts.OptimizationLevel > 0;
2256}
2257
2258void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD, llvm::GlobalValue *GV) {
2259 const auto *D = cast<ValueDecl>(GD.getDecl());
2260
2261 PrettyStackTraceDecl CrashInfo(const_cast<ValueDecl *>(D), D->getLocation(),
2262 Context.getSourceManager(),
2263 "Generating code for declaration");
2264
2265 if (isa<FunctionDecl>(D)) {
2266 // At -O0, don't generate IR for functions with available_externally
2267 // linkage.
2268 if (!shouldEmitFunction(GD))
2269 return;
2270
2271 if (const auto *Method = dyn_cast<CXXMethodDecl>(D)) {
2272 // Make sure to emit the definition(s) before we emit the thunks.
2273 // This is necessary for the generation of certain thunks.
2274 if (const auto *CD = dyn_cast<CXXConstructorDecl>(Method))
2275 ABI->emitCXXStructor(CD, getFromCtorType(GD.getCtorType()));
2276 else if (const auto *DD = dyn_cast<CXXDestructorDecl>(Method))
2277 ABI->emitCXXStructor(DD, getFromDtorType(GD.getDtorType()));
2278 else
2279 EmitGlobalFunctionDefinition(GD, GV);
2280
2281 if (Method->isVirtual())
2282 getVTables().EmitThunks(GD);
2283
2284 return;
2285 }
2286
2287 return EmitGlobalFunctionDefinition(GD, GV);
2288 }
2289
2290 if (const auto *VD = dyn_cast<VarDecl>(D))
2291 return EmitGlobalVarDefinition(VD, !VD->hasDefinition());
2292
2293 llvm_unreachable("Invalid argument to EmitGlobalDefinition()")::llvm::llvm_unreachable_internal("Invalid argument to EmitGlobalDefinition()"
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2293)
;
2294}
2295
2296static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old,
2297 llvm::Function *NewFn);
2298
2299void CodeGenModule::emitMultiVersionFunctions() {
2300 for (GlobalDecl GD : MultiVersionFuncs) {
2301 SmallVector<CodeGenFunction::MultiVersionResolverOption, 10> Options;
2302 const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
2303 getContext().forEachMultiversionedFunctionVersion(
2304 FD, [this, &GD, &Options](const FunctionDecl *CurFD) {
2305 GlobalDecl CurGD{
2306 (CurFD->isDefined() ? CurFD->getDefinition() : CurFD)};
2307 StringRef MangledName = getMangledName(CurGD);
2308 llvm::Constant *Func = GetGlobalValue(MangledName);
2309 if (!Func) {
2310 if (CurFD->isDefined()) {
2311 EmitGlobalFunctionDefinition(CurGD, nullptr);
2312 Func = GetGlobalValue(MangledName);
2313 } else {
2314 const CGFunctionInfo &FI =
2315 getTypes().arrangeGlobalDeclaration(GD);
2316 llvm::FunctionType *Ty = getTypes().GetFunctionType(FI);
2317 Func = GetAddrOfFunction(CurGD, Ty, /*ForVTable=*/false,
2318 /*DontDefer=*/false, ForDefinition);
2319 }
2320 assert(Func && "This should have just been created")(static_cast <bool> (Func && "This should have just been created"
) ? void (0) : __assert_fail ("Func && \"This should have just been created\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2320, __extension__ __PRETTY_FUNCTION__))
;
2321 }
2322 Options.emplace_back(getTarget(), cast<llvm::Function>(Func),
2323 CurFD->getAttr<TargetAttr>()->parse());
2324 });
2325
2326 llvm::Function *ResolverFunc = cast<llvm::Function>(
2327 GetGlobalValue((getMangledName(GD) + ".resolver").str()));
2328 if (supportsCOMDAT())
2329 ResolverFunc->setComdat(
2330 getModule().getOrInsertComdat(ResolverFunc->getName()));
2331 std::stable_sort(
2332 Options.begin(), Options.end(),
2333 std::greater<CodeGenFunction::MultiVersionResolverOption>());
2334 CodeGenFunction CGF(*this);
2335 CGF.EmitMultiVersionResolver(ResolverFunc, Options);
2336 }
2337}
2338
2339/// If an ifunc for the specified mangled name is not in the module, create and
2340/// return an llvm IFunc Function with the specified type.
2341llvm::Constant *
2342CodeGenModule::GetOrCreateMultiVersionIFunc(GlobalDecl GD, llvm::Type *DeclTy,
2343 StringRef MangledName,
2344 const FunctionDecl *FD) {
2345 std::string IFuncName = (MangledName + ".ifunc").str();
2346 if (llvm::GlobalValue *IFuncGV = GetGlobalValue(IFuncName))
2347 return IFuncGV;
2348
2349 // Since this is the first time we've created this IFunc, make sure
2350 // that we put this multiversioned function into the list to be
2351 // replaced later.
2352 MultiVersionFuncs.push_back(GD);
2353
2354 std::string ResolverName = (MangledName + ".resolver").str();
2355 llvm::Type *ResolverType = llvm::FunctionType::get(
2356 llvm::PointerType::get(DeclTy,
2357 Context.getTargetAddressSpace(FD->getType())),
2358 false);
2359 llvm::Constant *Resolver =
2360 GetOrCreateLLVMFunction(ResolverName, ResolverType, GlobalDecl{},
2361 /*ForVTable=*/false);
2362 llvm::GlobalIFunc *GIF = llvm::GlobalIFunc::create(
2363 DeclTy, 0, llvm::Function::ExternalLinkage, "", Resolver, &getModule());
2364 GIF->setName(IFuncName);
2365 SetCommonAttributes(FD, GIF);
2366
2367 return GIF;
2368}
2369
2370/// GetOrCreateLLVMFunction - If the specified mangled name is not in the
2371/// module, create and return an llvm Function with the specified type. If there
2372/// is something in the module with the specified name, return it potentially
2373/// bitcasted to the right type.
2374///
2375/// If D is non-null, it specifies a decl that correspond to this. This is used
2376/// to set the attributes on the function when it is first created.
2377llvm::Constant *CodeGenModule::GetOrCreateLLVMFunction(
2378 StringRef MangledName, llvm::Type *Ty, GlobalDecl GD, bool ForVTable,
2379 bool DontDefer, bool IsThunk, llvm::AttributeList ExtraAttrs,
2380 ForDefinition_t IsForDefinition) {
2381 const Decl *D = GD.getDecl();
2382
2383 // Any attempts to use a MultiVersion function should result in retrieving
2384 // the iFunc instead. Name Mangling will handle the rest of the changes.
2385 if (const FunctionDecl *FD = cast_or_null<FunctionDecl>(D)) {
2386 if (FD->isMultiVersion() && FD->getAttr<TargetAttr>()->isDefaultVersion()) {
2387 UpdateMultiVersionNames(GD, FD);
2388 if (!IsForDefinition)
2389 return GetOrCreateMultiVersionIFunc(GD, Ty, MangledName, FD);
2390 }
2391 }
2392
2393 // Lookup the entry, lazily creating it if necessary.
2394 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
2395 if (Entry) {
2396 if (WeakRefReferences.erase(Entry)) {
2397 const FunctionDecl *FD = cast_or_null<FunctionDecl>(D);
2398 if (FD && !FD->hasAttr<WeakAttr>())
2399 Entry->setLinkage(llvm::Function::ExternalLinkage);
2400 }
2401
2402 // Handle dropped DLL attributes.
2403 if (D && !D->hasAttr<DLLImportAttr>() && !D->hasAttr<DLLExportAttr>())
2404 Entry->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
2405
2406 // If there are two attempts to define the same mangled name, issue an
2407 // error.
2408 if (IsForDefinition && !Entry->isDeclaration()) {
2409 GlobalDecl OtherGD;
2410 // Check that GD is not yet in DiagnosedConflictingDefinitions is required
2411 // to make sure that we issue an error only once.
2412 if (lookupRepresentativeDecl(MangledName, OtherGD) &&
2413 (GD.getCanonicalDecl().getDecl() !=
2414 OtherGD.getCanonicalDecl().getDecl()) &&
2415 DiagnosedConflictingDefinitions.insert(GD).second) {
2416 getDiags().Report(D->getLocation(),
2417 diag::err_duplicate_mangled_name);
2418 getDiags().Report(OtherGD.getDecl()->getLocation(),
2419 diag::note_previous_definition);
2420 }
2421 }
2422
2423 if ((isa<llvm::Function>(Entry) || isa<llvm::GlobalAlias>(Entry)) &&
2424 (Entry->getType()->getElementType() == Ty)) {
2425 return Entry;
2426 }
2427
2428 // Make sure the result is of the correct type.
2429 // (If function is requested for a definition, we always need to create a new
2430 // function, not just return a bitcast.)
2431 if (!IsForDefinition)
2432 return llvm::ConstantExpr::getBitCast(Entry, Ty->getPointerTo());
2433 }
2434
2435 // This function doesn't have a complete type (for example, the return
2436 // type is an incomplete struct). Use a fake type instead, and make
2437 // sure not to try to set attributes.
2438 bool IsIncompleteFunction = false;
2439
2440 llvm::FunctionType *FTy;
2441 if (isa<llvm::FunctionType>(Ty)) {
2442 FTy = cast<llvm::FunctionType>(Ty);
2443 } else {
2444 FTy = llvm::FunctionType::get(VoidTy, false);
2445 IsIncompleteFunction = true;
2446 }
2447
2448 llvm::Function *F =
2449 llvm::Function::Create(FTy, llvm::Function::ExternalLinkage,
2450 Entry ? StringRef() : MangledName, &getModule());
2451
2452 // If we already created a function with the same mangled name (but different
2453 // type) before, take its name and add it to the list of functions to be
2454 // replaced with F at the end of CodeGen.
2455 //
2456 // This happens if there is a prototype for a function (e.g. "int f()") and
2457 // then a definition of a different type (e.g. "int f(int x)").
2458 if (Entry) {
2459 F->takeName(Entry);
2460
2461 // This might be an implementation of a function without a prototype, in
2462 // which case, try to do special replacement of calls which match the new
2463 // prototype. The really key thing here is that we also potentially drop
2464 // arguments from the call site so as to make a direct call, which makes the
2465 // inliner happier and suppresses a number of optimizer warnings (!) about
2466 // dropping arguments.
2467 if (!Entry->use_empty()) {
2468 ReplaceUsesOfNonProtoTypeWithRealFunction(Entry, F);
2469 Entry->removeDeadConstantUsers();
2470 }
2471
2472 llvm::Constant *BC = llvm::ConstantExpr::getBitCast(
2473 F, Entry->getType()->getElementType()->getPointerTo());
2474 addGlobalValReplacement(Entry, BC);
2475 }
2476
2477 assert(F->getName() == MangledName && "name was uniqued!")(static_cast <bool> (F->getName() == MangledName &&
"name was uniqued!") ? void (0) : __assert_fail ("F->getName() == MangledName && \"name was uniqued!\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2477, __extension__ __PRETTY_FUNCTION__))
;
2478 if (D)
2479 SetFunctionAttributes(GD, F, IsIncompleteFunction, IsThunk);
2480 if (ExtraAttrs.hasAttributes(llvm::AttributeList::FunctionIndex)) {
2481 llvm::AttrBuilder B(ExtraAttrs, llvm::AttributeList::FunctionIndex);
2482 F->addAttributes(llvm::AttributeList::FunctionIndex, B);
2483 }
2484
2485 if (!DontDefer) {
2486 // All MSVC dtors other than the base dtor are linkonce_odr and delegate to
2487 // each other bottoming out with the base dtor. Therefore we emit non-base
2488 // dtors on usage, even if there is no dtor definition in the TU.
2489 if (D && isa<CXXDestructorDecl>(D) &&
2490 getCXXABI().useThunkForDtorVariant(cast<CXXDestructorDecl>(D),
2491 GD.getDtorType()))
2492 addDeferredDeclToEmit(GD);
2493
2494 // This is the first use or definition of a mangled name. If there is a
2495 // deferred decl with this name, remember that we need to emit it at the end
2496 // of the file.
2497 auto DDI = DeferredDecls.find(MangledName);
2498 if (DDI != DeferredDecls.end()) {
2499 // Move the potentially referenced deferred decl to the
2500 // DeferredDeclsToEmit list, and remove it from DeferredDecls (since we
2501 // don't need it anymore).
2502 addDeferredDeclToEmit(DDI->second);
2503 DeferredDecls.erase(DDI);
2504
2505 // Otherwise, there are cases we have to worry about where we're
2506 // using a declaration for which we must emit a definition but where
2507 // we might not find a top-level definition:
2508 // - member functions defined inline in their classes
2509 // - friend functions defined inline in some class
2510 // - special member functions with implicit definitions
2511 // If we ever change our AST traversal to walk into class methods,
2512 // this will be unnecessary.
2513 //
2514 // We also don't emit a definition for a function if it's going to be an
2515 // entry in a vtable, unless it's already marked as used.
2516 } else if (getLangOpts().CPlusPlus && D) {
2517 // Look for a declaration that's lexically in a record.
2518 for (const auto *FD = cast<FunctionDecl>(D)->getMostRecentDecl(); FD;
2519 FD = FD->getPreviousDecl()) {
2520 if (isa<CXXRecordDecl>(FD->getLexicalDeclContext())) {
2521 if (FD->doesThisDeclarationHaveABody()) {
2522 addDeferredDeclToEmit(GD.getWithDecl(FD));
2523 break;
2524 }
2525 }
2526 }
2527 }
2528 }
2529
2530 // Make sure the result is of the requested type.
2531 if (!IsIncompleteFunction) {
2532 assert(F->getType()->getElementType() == Ty)(static_cast <bool> (F->getType()->getElementType
() == Ty) ? void (0) : __assert_fail ("F->getType()->getElementType() == Ty"
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2532, __extension__ __PRETTY_FUNCTION__))
;
2533 return F;
2534 }
2535
2536 llvm::Type *PTy = llvm::PointerType::getUnqual(Ty);
2537 return llvm::ConstantExpr::getBitCast(F, PTy);
2538}
2539
2540/// GetAddrOfFunction - Return the address of the given function. If Ty is
2541/// non-null, then this function will use the specified type if it has to
2542/// create it (this occurs when we see a definition of the function).
2543llvm::Constant *CodeGenModule::GetAddrOfFunction(GlobalDecl GD,
2544 llvm::Type *Ty,
2545 bool ForVTable,
2546 bool DontDefer,
2547 ForDefinition_t IsForDefinition) {
2548 // If there was no specific requested type, just convert it now.
2549 if (!Ty) {
2550 const auto *FD = cast<FunctionDecl>(GD.getDecl());
2551 auto CanonTy = Context.getCanonicalType(FD->getType());
2552 Ty = getTypes().ConvertFunctionType(CanonTy, FD);
2553 }
2554
2555 StringRef MangledName = getMangledName(GD);
2556 return GetOrCreateLLVMFunction(MangledName, Ty, GD, ForVTable, DontDefer,
2557 /*IsThunk=*/false, llvm::AttributeList(),
2558 IsForDefinition);
2559}
2560
2561static const FunctionDecl *
2562GetRuntimeFunctionDecl(ASTContext &C, StringRef Name) {
2563 TranslationUnitDecl *TUDecl = C.getTranslationUnitDecl();
2564 DeclContext *DC = TranslationUnitDecl::castToDeclContext(TUDecl);
2565
2566 IdentifierInfo &CII = C.Idents.get(Name);
2567 for (const auto &Result : DC->lookup(&CII))
2568 if (const auto FD = dyn_cast<FunctionDecl>(Result))
2569 return FD;
2570
2571 if (!C.getLangOpts().CPlusPlus)
2572 return nullptr;
2573
2574 // Demangle the premangled name from getTerminateFn()
2575 IdentifierInfo &CXXII =
2576 (Name == "_ZSt9terminatev" || Name == "\01?terminate@@YAXXZ")
2577 ? C.Idents.get("terminate")
2578 : C.Idents.get(Name);
2579
2580 for (const auto &N : {"__cxxabiv1", "std"}) {
2581 IdentifierInfo &NS = C.Idents.get(N);
2582 for (const auto &Result : DC->lookup(&NS)) {
2583 NamespaceDecl *ND = dyn_cast<NamespaceDecl>(Result);
2584 if (auto LSD = dyn_cast<LinkageSpecDecl>(Result))
2585 for (const auto &Result : LSD->lookup(&NS))
2586 if ((ND = dyn_cast<NamespaceDecl>(Result)))
2587 break;
2588
2589 if (ND)
2590 for (const auto &Result : ND->lookup(&CXXII))
2591 if (const auto *FD = dyn_cast<FunctionDecl>(Result))
2592 return FD;
2593 }
2594 }
2595
2596 return nullptr;
2597}
2598
2599/// CreateRuntimeFunction - Create a new runtime function with the specified
2600/// type and name.
2601llvm::Constant *
2602CodeGenModule::CreateRuntimeFunction(llvm::FunctionType *FTy, StringRef Name,
2603 llvm::AttributeList ExtraAttrs,
2604 bool Local) {
2605 llvm::Constant *C =
2606 GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(), /*ForVTable=*/false,
2607 /*DontDefer=*/false, /*IsThunk=*/false,
2608 ExtraAttrs);
2609
2610 if (auto *F = dyn_cast<llvm::Function>(C)) {
2611 if (F->empty()) {
2612 F->setCallingConv(getRuntimeCC());
2613
2614 if (!Local && getTriple().isOSBinFormatCOFF() &&
2615 !getCodeGenOpts().LTOVisibilityPublicStd &&
2616 !getTriple().isWindowsGNUEnvironment()) {
2617 const FunctionDecl *FD = GetRuntimeFunctionDecl(Context, Name);
2618 if (!FD || FD->hasAttr<DLLImportAttr>()) {
2619 F->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
2620 F->setLinkage(llvm::GlobalValue::ExternalLinkage);
2621 }
2622 }
2623 }
2624 }
2625
2626 return C;
2627}
2628
2629/// CreateBuiltinFunction - Create a new builtin function with the specified
2630/// type and name.
2631llvm::Constant *
2632CodeGenModule::CreateBuiltinFunction(llvm::FunctionType *FTy, StringRef Name,
2633 llvm::AttributeList ExtraAttrs) {
2634 llvm::Constant *C =
2635 GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(), /*ForVTable=*/false,
2636 /*DontDefer=*/false, /*IsThunk=*/false, ExtraAttrs);
2637 if (auto *F = dyn_cast<llvm::Function>(C))
2638 if (F->empty())
2639 F->setCallingConv(getBuiltinCC());
2640 return C;
2641}
2642
2643/// isTypeConstant - Determine whether an object of this type can be emitted
2644/// as a constant.
2645///
2646/// If ExcludeCtor is true, the duration when the object's constructor runs
2647/// will not be considered. The caller will need to verify that the object is
2648/// not written to during its construction.
2649bool CodeGenModule::isTypeConstant(QualType Ty, bool ExcludeCtor) {
2650 if (!Ty.isConstant(Context) && !Ty->isReferenceType())
2651 return false;
2652
2653 if (Context.getLangOpts().CPlusPlus) {
2654 if (const CXXRecordDecl *Record
2655 = Context.getBaseElementType(Ty)->getAsCXXRecordDecl())
2656 return ExcludeCtor && !Record->hasMutableFields() &&
2657 Record->hasTrivialDestructor();
2658 }
2659
2660 return true;
2661}
2662
2663/// GetOrCreateLLVMGlobal - If the specified mangled name is not in the module,
2664/// create and return an llvm GlobalVariable with the specified type. If there
2665/// is something in the module with the specified name, return it potentially
2666/// bitcasted to the right type.
2667///
2668/// If D is non-null, it specifies a decl that correspond to this. This is used
2669/// to set the attributes on the global when it is first created.
2670///
2671/// If IsForDefinition is true, it is guranteed that an actual global with
2672/// type Ty will be returned, not conversion of a variable with the same
2673/// mangled name but some other type.
2674llvm::Constant *
2675CodeGenModule::GetOrCreateLLVMGlobal(StringRef MangledName,
2676 llvm::PointerType *Ty,
2677 const VarDecl *D,
2678 ForDefinition_t IsForDefinition) {
2679 // Lookup the entry, lazily creating it if necessary.
2680 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
2681 if (Entry) {
2682 if (WeakRefReferences.erase(Entry)) {
2683 if (D && !D->hasAttr<WeakAttr>())
2684 Entry->setLinkage(llvm::Function::ExternalLinkage);
2685 }
2686
2687 // Handle dropped DLL attributes.
2688 if (D && !D->hasAttr<DLLImportAttr>() && !D->hasAttr<DLLExportAttr>())
2689 Entry->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
2690
2691 if (Entry->getType() == Ty)
2692 return Entry;
2693
2694 // If there are two attempts to define the same mangled name, issue an
2695 // error.
2696 if (IsForDefinition && !Entry->isDeclaration()) {
2697 GlobalDecl OtherGD;
2698 const VarDecl *OtherD;
2699
2700 // Check that D is not yet in DiagnosedConflictingDefinitions is required
2701 // to make sure that we issue an error only once.
2702 if (D && lookupRepresentativeDecl(MangledName, OtherGD) &&
2703 (D->getCanonicalDecl() != OtherGD.getCanonicalDecl().getDecl()) &&
2704 (OtherD = dyn_cast<VarDecl>(OtherGD.getDecl())) &&
2705 OtherD->hasInit() &&
2706 DiagnosedConflictingDefinitions.insert(D).second) {
2707 getDiags().Report(D->getLocation(),
2708 diag::err_duplicate_mangled_name);
2709 getDiags().Report(OtherGD.getDecl()->getLocation(),
2710 diag::note_previous_definition);
2711 }
2712 }
2713
2714 // Make sure the result is of the correct type.
2715 if (Entry->getType()->getAddressSpace() != Ty->getAddressSpace())
2716 return llvm::ConstantExpr::getAddrSpaceCast(Entry, Ty);
2717
2718 // (If global is requested for a definition, we always need to create a new
2719 // global, not just return a bitcast.)
2720 if (!IsForDefinition)
2721 return llvm::ConstantExpr::getBitCast(Entry, Ty);
2722 }
2723
2724 auto AddrSpace = GetGlobalVarAddressSpace(D);
2725 auto TargetAddrSpace = getContext().getTargetAddressSpace(AddrSpace);
2726
2727 auto *GV = new llvm::GlobalVariable(
2728 getModule(), Ty->getElementType(), false,
2729 llvm::GlobalValue::ExternalLinkage, nullptr, MangledName, nullptr,
2730 llvm::GlobalVariable::NotThreadLocal, TargetAddrSpace);
2731
2732 // If we already created a global with the same mangled name (but different
2733 // type) before, take its name and remove it from its parent.
2734 if (Entry) {
2735 GV->takeName(Entry);
2736
2737 if (!Entry->use_empty()) {
2738 llvm::Constant *NewPtrForOldDecl =
2739 llvm::ConstantExpr::getBitCast(GV, Entry->getType());
2740 Entry->replaceAllUsesWith(NewPtrForOldDecl);
2741 }
2742
2743 Entry->eraseFromParent();
2744 }
2745
2746 // This is the first use or definition of a mangled name. If there is a
2747 // deferred decl with this name, remember that we need to emit it at the end
2748 // of the file.
2749 auto DDI = DeferredDecls.find(MangledName);
2750 if (DDI != DeferredDecls.end()) {
2751 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit
2752 // list, and remove it from DeferredDecls (since we don't need it anymore).
2753 addDeferredDeclToEmit(DDI->second);
2754 DeferredDecls.erase(DDI);
2755 }
2756
2757 // Handle things which are present even on external declarations.
2758 if (D) {
2759 // FIXME: This code is overly simple and should be merged with other global
2760 // handling.
2761 GV->setConstant(isTypeConstant(D->getType(), false));
2762
2763 GV->setAlignment(getContext().getDeclAlign(D).getQuantity());
2764
2765 setLinkageForGV(GV, D);
2766
2767 if (D->getTLSKind()) {
2768 if (D->getTLSKind() == VarDecl::TLS_Dynamic)
2769 CXXThreadLocals.push_back(D);
2770 setTLSMode(GV, *D);
2771 }
2772
2773 setGVProperties(GV, D);
2774
2775 // If required by the ABI, treat declarations of static data members with
2776 // inline initializers as definitions.
2777 if (getContext().isMSStaticDataMemberInlineDefinition(D)) {
2778 EmitGlobalVarDefinition(D);
2779 }
2780
2781 // Emit section information for extern variables.
2782 if (D->hasExternalStorage()) {
2783 if (const SectionAttr *SA = D->getAttr<SectionAttr>())
2784 GV->setSection(SA->getName());
2785 }
2786
2787 // Handle XCore specific ABI requirements.
2788 if (getTriple().getArch() == llvm::Triple::xcore &&
2789 D->getLanguageLinkage() == CLanguageLinkage &&
2790 D->getType().isConstant(Context) &&
2791 isExternallyVisible(D->getLinkageAndVisibility().getLinkage()))
2792 GV->setSection(".cp.rodata");
2793
2794 // Check if we a have a const declaration with an initializer, we may be
2795 // able to emit it as available_externally to expose it's value to the
2796 // optimizer.
2797 if (Context.getLangOpts().CPlusPlus && GV->hasExternalLinkage() &&
2798 D->getType().isConstQualified() && !GV->hasInitializer() &&
2799 !D->hasDefinition() && D->hasInit() && !D->hasAttr<DLLImportAttr>()) {
2800 const auto *Record =
2801 Context.getBaseElementType(D->getType())->getAsCXXRecordDecl();
2802 bool HasMutableFields = Record && Record->hasMutableFields();
2803 if (!HasMutableFields) {
2804 const VarDecl *InitDecl;
2805 const Expr *InitExpr = D->getAnyInitializer(InitDecl);
2806 if (InitExpr) {
2807 ConstantEmitter emitter(*this);
2808 llvm::Constant *Init = emitter.tryEmitForInitializer(*InitDecl);
2809 if (Init) {
2810 auto *InitType = Init->getType();
2811 if (GV->getType()->getElementType() != InitType) {
2812 // The type of the initializer does not match the definition.
2813 // This happens when an initializer has a different type from
2814 // the type of the global (because of padding at the end of a
2815 // structure for instance).
2816 GV->setName(StringRef());
2817 // Make a new global with the correct type, this is now guaranteed
2818 // to work.
2819 auto *NewGV = cast<llvm::GlobalVariable>(
2820 GetAddrOfGlobalVar(D, InitType, IsForDefinition));
2821
2822 // Erase the old global, since it is no longer used.
2823 cast<llvm::GlobalValue>(GV)->eraseFromParent();
2824 GV = NewGV;
2825 } else {
2826 GV->setInitializer(Init);
2827 GV->setConstant(true);
2828 GV->setLinkage(llvm::GlobalValue::AvailableExternallyLinkage);
2829 }
2830 emitter.finalize(GV);
2831 }
2832 }
2833 }
2834 }
2835 }
2836
2837 LangAS ExpectedAS =
2838 D ? D->getType().getAddressSpace()
2839 : (LangOpts.OpenCL ? LangAS::opencl_global : LangAS::Default);
2840 assert(getContext().getTargetAddressSpace(ExpectedAS) ==(static_cast <bool> (getContext().getTargetAddressSpace
(ExpectedAS) == Ty->getPointerAddressSpace()) ? void (0) :
__assert_fail ("getContext().getTargetAddressSpace(ExpectedAS) == Ty->getPointerAddressSpace()"
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2841, __extension__ __PRETTY_FUNCTION__))
2841 Ty->getPointerAddressSpace())(static_cast <bool> (getContext().getTargetAddressSpace
(ExpectedAS) == Ty->getPointerAddressSpace()) ? void (0) :
__assert_fail ("getContext().getTargetAddressSpace(ExpectedAS) == Ty->getPointerAddressSpace()"
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2841, __extension__ __PRETTY_FUNCTION__))
;
2842 if (AddrSpace != ExpectedAS)
2843 return getTargetCodeGenInfo().performAddrSpaceCast(*this, GV, AddrSpace,
2844 ExpectedAS, Ty);
2845
2846 return GV;
2847}
2848
2849llvm::Constant *
2850CodeGenModule::GetAddrOfGlobal(GlobalDecl GD,
2851 ForDefinition_t IsForDefinition) {
2852 const Decl *D = GD.getDecl();
2853 if (isa<CXXConstructorDecl>(D))
2854 return getAddrOfCXXStructor(cast<CXXConstructorDecl>(D),
2855 getFromCtorType(GD.getCtorType()),
2856 /*FnInfo=*/nullptr, /*FnType=*/nullptr,
2857 /*DontDefer=*/false, IsForDefinition);
2858 else if (isa<CXXDestructorDecl>(D))
2859 return getAddrOfCXXStructor(cast<CXXDestructorDecl>(D),
2860 getFromDtorType(GD.getDtorType()),
2861 /*FnInfo=*/nullptr, /*FnType=*/nullptr,
2862 /*DontDefer=*/false, IsForDefinition);
2863 else if (isa<CXXMethodDecl>(D)) {
2864 auto FInfo = &getTypes().arrangeCXXMethodDeclaration(
2865 cast<CXXMethodDecl>(D));
2866 auto Ty = getTypes().GetFunctionType(*FInfo);
2867 return GetAddrOfFunction(GD, Ty, /*ForVTable=*/false, /*DontDefer=*/false,
2868 IsForDefinition);
2869 } else if (isa<FunctionDecl>(D)) {
2870 const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
2871 llvm::FunctionType *Ty = getTypes().GetFunctionType(FI);
2872 return GetAddrOfFunction(GD, Ty, /*ForVTable=*/false, /*DontDefer=*/false,
2873 IsForDefinition);
2874 } else
2875 return GetAddrOfGlobalVar(cast<VarDecl>(D), /*Ty=*/nullptr,
2876 IsForDefinition);
2877}
2878
2879llvm::GlobalVariable *
2880CodeGenModule::CreateOrReplaceCXXRuntimeVariable(StringRef Name,
2881 llvm::Type *Ty,
2882 llvm::GlobalValue::LinkageTypes Linkage) {
2883 llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name);
2884 llvm::GlobalVariable *OldGV = nullptr;
2885
2886 if (GV) {
2887 // Check if the variable has the right type.
2888 if (GV->getType()->getElementType() == Ty)
2889 return GV;
2890
2891 // Because C++ name mangling, the only way we can end up with an already
2892 // existing global with the same name is if it has been declared extern "C".
2893 assert(GV->isDeclaration() && "Declaration has wrong type!")(static_cast <bool> (GV->isDeclaration() && "Declaration has wrong type!"
) ? void (0) : __assert_fail ("GV->isDeclaration() && \"Declaration has wrong type!\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2893, __extension__ __PRETTY_FUNCTION__))
;
2894 OldGV = GV;
2895 }
2896
2897 // Create a new variable.
2898 GV = new llvm::GlobalVariable(getModule(), Ty, /*isConstant=*/true,
2899 Linkage, nullptr, Name);
2900
2901 if (OldGV) {
2902 // Replace occurrences of the old variable if needed.
2903 GV->takeName(OldGV);
2904
2905 if (!OldGV->use_empty()) {
2906 llvm::Constant *NewPtrForOldDecl =
2907 llvm::ConstantExpr::getBitCast(GV, OldGV->getType());
2908 OldGV->replaceAllUsesWith(NewPtrForOldDecl);
2909 }
2910
2911 OldGV->eraseFromParent();
2912 }
2913
2914 if (supportsCOMDAT() && GV->isWeakForLinker() &&
2915 !GV->hasAvailableExternallyLinkage())
2916 GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
2917
2918 return GV;
2919}
2920
2921/// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the
2922/// given global variable. If Ty is non-null and if the global doesn't exist,
2923/// then it will be created with the specified type instead of whatever the
2924/// normal requested type would be. If IsForDefinition is true, it is guranteed
2925/// that an actual global with type Ty will be returned, not conversion of a
2926/// variable with the same mangled name but some other type.
2927llvm::Constant *CodeGenModule::GetAddrOfGlobalVar(const VarDecl *D,
2928 llvm::Type *Ty,
2929 ForDefinition_t IsForDefinition) {
2930 assert(D->hasGlobalStorage() && "Not a global variable")(static_cast <bool> (D->hasGlobalStorage() &&
"Not a global variable") ? void (0) : __assert_fail ("D->hasGlobalStorage() && \"Not a global variable\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2930, __extension__ __PRETTY_FUNCTION__))
;
2931 QualType ASTTy = D->getType();
2932 if (!Ty)
2933 Ty = getTypes().ConvertTypeForMem(ASTTy);
2934
2935 llvm::PointerType *PTy =
2936 llvm::PointerType::get(Ty, getContext().getTargetAddressSpace(ASTTy));
2937
2938 StringRef MangledName = getMangledName(D);
2939 return GetOrCreateLLVMGlobal(MangledName, PTy, D, IsForDefinition);
2940}
2941
2942/// CreateRuntimeVariable - Create a new runtime global variable with the
2943/// specified type and name.
2944llvm::Constant *
2945CodeGenModule::CreateRuntimeVariable(llvm::Type *Ty,
2946 StringRef Name) {
2947 return GetOrCreateLLVMGlobal(Name, llvm::PointerType::getUnqual(Ty), nullptr);
2948}
2949
2950void CodeGenModule::EmitTentativeDefinition(const VarDecl *D) {
2951 assert(!D->getInit() && "Cannot emit definite definitions here!")(static_cast <bool> (!D->getInit() && "Cannot emit definite definitions here!"
) ? void (0) : __assert_fail ("!D->getInit() && \"Cannot emit definite definitions here!\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2951, __extension__ __PRETTY_FUNCTION__))
;
2952
2953 StringRef MangledName = getMangledName(D);
2954 llvm::GlobalValue *GV = GetGlobalValue(MangledName);
2955
2956 // We already have a definition, not declaration, with the same mangled name.
2957 // Emitting of declaration is not required (and actually overwrites emitted
2958 // definition).
2959 if (GV && !GV->isDeclaration())
2960 return;
2961
2962 // If we have not seen a reference to this variable yet, place it into the
2963 // deferred declarations table to be emitted if needed later.
2964 if (!MustBeEmitted(D) && !GV) {
2965 DeferredDecls[MangledName] = D;
2966 return;
2967 }
2968
2969 // The tentative definition is the only definition.
2970 EmitGlobalVarDefinition(D);
2971}
2972
2973CharUnits CodeGenModule::GetTargetTypeStoreSize(llvm::Type *Ty) const {
2974 return Context.toCharUnitsFromBits(
2975 getDataLayout().getTypeStoreSizeInBits(Ty));
2976}
2977
2978LangAS CodeGenModule::GetGlobalVarAddressSpace(const VarDecl *D) {
2979 LangAS AddrSpace = LangAS::Default;
2980 if (LangOpts.OpenCL) {
2981 AddrSpace = D ? D->getType().getAddressSpace() : LangAS::opencl_global;
2982 assert(AddrSpace == LangAS::opencl_global ||(static_cast <bool> (AddrSpace == LangAS::opencl_global
|| AddrSpace == LangAS::opencl_constant || AddrSpace == LangAS
::opencl_local || AddrSpace >= LangAS::FirstTargetAddressSpace
) ? void (0) : __assert_fail ("AddrSpace == LangAS::opencl_global || AddrSpace == LangAS::opencl_constant || AddrSpace == LangAS::opencl_local || AddrSpace >= LangAS::FirstTargetAddressSpace"
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2985, __extension__ __PRETTY_FUNCTION__))
2983 AddrSpace == LangAS::opencl_constant ||(static_cast <bool> (AddrSpace == LangAS::opencl_global
|| AddrSpace == LangAS::opencl_constant || AddrSpace == LangAS
::opencl_local || AddrSpace >= LangAS::FirstTargetAddressSpace
) ? void (0) : __assert_fail ("AddrSpace == LangAS::opencl_global || AddrSpace == LangAS::opencl_constant || AddrSpace == LangAS::opencl_local || AddrSpace >= LangAS::FirstTargetAddressSpace"
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2985, __extension__ __PRETTY_FUNCTION__))
2984 AddrSpace == LangAS::opencl_local ||(static_cast <bool> (AddrSpace == LangAS::opencl_global
|| AddrSpace == LangAS::opencl_constant || AddrSpace == LangAS
::opencl_local || AddrSpace >= LangAS::FirstTargetAddressSpace
) ? void (0) : __assert_fail ("AddrSpace == LangAS::opencl_global || AddrSpace == LangAS::opencl_constant || AddrSpace == LangAS::opencl_local || AddrSpace >= LangAS::FirstTargetAddressSpace"
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2985, __extension__ __PRETTY_FUNCTION__))
2985 AddrSpace >= LangAS::FirstTargetAddressSpace)(static_cast <bool> (AddrSpace == LangAS::opencl_global
|| AddrSpace == LangAS::opencl_constant || AddrSpace == LangAS
::opencl_local || AddrSpace >= LangAS::FirstTargetAddressSpace
) ? void (0) : __assert_fail ("AddrSpace == LangAS::opencl_global || AddrSpace == LangAS::opencl_constant || AddrSpace == LangAS::opencl_local || AddrSpace >= LangAS::FirstTargetAddressSpace"
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 2985, __extension__ __PRETTY_FUNCTION__))
;
2986 return AddrSpace;
2987 }
2988
2989 if (LangOpts.CUDA && LangOpts.CUDAIsDevice) {
2990 if (D && D->hasAttr<CUDAConstantAttr>())
2991 return LangAS::cuda_constant;
2992 else if (D && D->hasAttr<CUDASharedAttr>())
2993 return LangAS::cuda_shared;
2994 else
2995 return LangAS::cuda_device;
2996 }
2997
2998 return getTargetCodeGenInfo().getGlobalVarAddressSpace(*this, D);
2999}
3000
3001template<typename SomeDecl>
3002void CodeGenModule::MaybeHandleStaticInExternC(const SomeDecl *D,
3003 llvm::GlobalValue *GV) {
3004 if (!getLangOpts().CPlusPlus)
3005 return;
3006
3007 // Must have 'used' attribute, or else inline assembly can't rely on
3008 // the name existing.
3009 if (!D->template hasAttr<UsedAttr>())
3010 return;
3011
3012 // Must have internal linkage and an ordinary name.
3013 if (!D->getIdentifier() || D->getFormalLinkage() != InternalLinkage)
3014 return;
3015
3016 // Must be in an extern "C" context. Entities declared directly within
3017 // a record are not extern "C" even if the record is in such a context.
3018 const SomeDecl *First = D->getFirstDecl();
3019 if (First->getDeclContext()->isRecord() || !First->isInExternCContext())
3020 return;
3021
3022 // OK, this is an internal linkage entity inside an extern "C" linkage
3023 // specification. Make a note of that so we can give it the "expected"
3024 // mangled name if nothing else is using that name.
3025 std::pair<StaticExternCMap::iterator, bool> R =
3026 StaticExternCValues.insert(std::make_pair(D->getIdentifier(), GV));
3027
3028 // If we have multiple internal linkage entities with the same name
3029 // in extern "C" regions, none of them gets that name.
3030 if (!R.second)
3031 R.first->second = nullptr;
3032}
3033
3034static bool shouldBeInCOMDAT(CodeGenModule &CGM, const Decl &D) {
3035 if (!CGM.supportsCOMDAT())
3036 return false;
3037
3038 if (D.hasAttr<SelectAnyAttr>())
3039 return true;
3040
3041 GVALinkage Linkage;
3042 if (auto *VD = dyn_cast<VarDecl>(&D))
3043 Linkage = CGM.getContext().GetGVALinkageForVariable(VD);
3044 else
3045 Linkage = CGM.getContext().GetGVALinkageForFunction(cast<FunctionDecl>(&D));
3046
3047 switch (Linkage) {
3048 case GVA_Internal:
3049 case GVA_AvailableExternally:
3050 case GVA_StrongExternal:
3051 return false;
3052 case GVA_DiscardableODR:
3053 case GVA_StrongODR:
3054 return true;
3055 }
3056 llvm_unreachable("No such linkage")::llvm::llvm_unreachable_internal("No such linkage", "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 3056)
;
3057}
3058
3059void CodeGenModule::maybeSetTrivialComdat(const Decl &D,
3060 llvm::GlobalObject &GO) {
3061 if (!shouldBeInCOMDAT(*this, D))
3062 return;
3063 GO.setComdat(TheModule.getOrInsertComdat(GO.getName()));
3064}
3065
3066/// Pass IsTentative as true if you want to create a tentative definition.
3067void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D,
3068 bool IsTentative) {
3069 // OpenCL global variables of sampler type are translated to function calls,
3070 // therefore no need to be translated.
3071 QualType ASTTy = D->getType();
3072 if (getLangOpts().OpenCL && ASTTy->isSamplerT())
3073 return;
3074
3075 llvm::Constant *Init = nullptr;
3076 CXXRecordDecl *RD = ASTTy->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
3077 bool NeedsGlobalCtor = false;
3078 bool NeedsGlobalDtor = RD && !RD->hasTrivialDestructor();
3079
3080 const VarDecl *InitDecl;
3081 const Expr *InitExpr = D->getAnyInitializer(InitDecl);
3082
3083 Optional<ConstantEmitter> emitter;
3084
3085 // CUDA E.2.4.1 "__shared__ variables cannot have an initialization
3086 // as part of their declaration." Sema has already checked for
3087 // error cases, so we just need to set Init to UndefValue.
3088 if (getLangOpts().CUDA && getLangOpts().CUDAIsDevice &&
3089 D->hasAttr<CUDASharedAttr>())
3090 Init = llvm::UndefValue::get(getTypes().ConvertType(ASTTy));
3091 else if (!InitExpr) {
3092 // This is a tentative definition; tentative definitions are
3093 // implicitly initialized with { 0 }.
3094 //
3095 // Note that tentative definitions are only emitted at the end of
3096 // a translation unit, so they should never have incomplete
3097 // type. In addition, EmitTentativeDefinition makes sure that we
3098 // never attempt to emit a tentative definition if a real one
3099 // exists. A use may still exists, however, so we still may need
3100 // to do a RAUW.
3101 assert(!ASTTy->isIncompleteType() && "Unexpected incomplete type")(static_cast <bool> (!ASTTy->isIncompleteType() &&
"Unexpected incomplete type") ? void (0) : __assert_fail ("!ASTTy->isIncompleteType() && \"Unexpected incomplete type\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 3101, __extension__ __PRETTY_FUNCTION__))
;
3102 Init = EmitNullConstant(D->getType());
3103 } else {
3104 initializedGlobalDecl = GlobalDecl(D);
3105 emitter.emplace(*this);
3106 Init = emitter->tryEmitForInitializer(*InitDecl);
3107
3108 if (!Init) {
3109 QualType T = InitExpr->getType();
3110 if (D->getType()->isReferenceType())
3111 T = D->getType();
3112
3113 if (getLangOpts().CPlusPlus) {
3114 Init = EmitNullConstant(T);
3115 NeedsGlobalCtor = true;
3116 } else {
3117 ErrorUnsupported(D, "static initializer");
3118 Init = llvm::UndefValue::get(getTypes().ConvertType(T));
3119 }
3120 } else {
3121 // We don't need an initializer, so remove the entry for the delayed
3122 // initializer position (just in case this entry was delayed) if we
3123 // also don't need to register a destructor.
3124 if (getLangOpts().CPlusPlus && !NeedsGlobalDtor)
3125 DelayedCXXInitPosition.erase(D);
3126 }
3127 }
3128
3129 llvm::Type* InitType = Init->getType();
3130 llvm::Constant *Entry =
3131 GetAddrOfGlobalVar(D, InitType, ForDefinition_t(!IsTentative));
3132
3133 // Strip off a bitcast if we got one back.
3134 if (auto *CE = dyn_cast<llvm::ConstantExpr>(Entry)) {
3135 assert(CE->getOpcode() == llvm::Instruction::BitCast ||(static_cast <bool> (CE->getOpcode() == llvm::Instruction
::BitCast || CE->getOpcode() == llvm::Instruction::AddrSpaceCast
|| CE->getOpcode() == llvm::Instruction::GetElementPtr) ?
void (0) : __assert_fail ("CE->getOpcode() == llvm::Instruction::BitCast || CE->getOpcode() == llvm::Instruction::AddrSpaceCast || CE->getOpcode() == llvm::Instruction::GetElementPtr"
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 3138, __extension__ __PRETTY_FUNCTION__))
3136 CE->getOpcode() == llvm::Instruction::AddrSpaceCast ||(static_cast <bool> (CE->getOpcode() == llvm::Instruction
::BitCast || CE->getOpcode() == llvm::Instruction::AddrSpaceCast
|| CE->getOpcode() == llvm::Instruction::GetElementPtr) ?
void (0) : __assert_fail ("CE->getOpcode() == llvm::Instruction::BitCast || CE->getOpcode() == llvm::Instruction::AddrSpaceCast || CE->getOpcode() == llvm::Instruction::GetElementPtr"
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 3138, __extension__ __PRETTY_FUNCTION__))
3137 // All zero index gep.(static_cast <bool> (CE->getOpcode() == llvm::Instruction
::BitCast || CE->getOpcode() == llvm::Instruction::AddrSpaceCast
|| CE->getOpcode() == llvm::Instruction::GetElementPtr) ?
void (0) : __assert_fail ("CE->getOpcode() == llvm::Instruction::BitCast || CE->getOpcode() == llvm::Instruction::AddrSpaceCast || CE->getOpcode() == llvm::Instruction::GetElementPtr"
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 3138, __extension__ __PRETTY_FUNCTION__))
3138 CE->getOpcode() == llvm::Instruction::GetElementPtr)(static_cast <bool> (CE->getOpcode() == llvm::Instruction
::BitCast || CE->getOpcode() == llvm::Instruction::AddrSpaceCast
|| CE->getOpcode() == llvm::Instruction::GetElementPtr) ?
void (0) : __assert_fail ("CE->getOpcode() == llvm::Instruction::BitCast || CE->getOpcode() == llvm::Instruction::AddrSpaceCast || CE->getOpcode() == llvm::Instruction::GetElementPtr"
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 3138, __extension__ __PRETTY_FUNCTION__))
;
3139 Entry = CE->getOperand(0);
3140 }
3141
3142 // Entry is now either a Function or GlobalVariable.
3143 auto *GV = dyn_cast<llvm::GlobalVariable>(Entry);
3144
3145 // We have a definition after a declaration with the wrong type.
3146 // We must make a new GlobalVariable* and update everything that used OldGV
3147 // (a declaration or tentative definition) with the new GlobalVariable*
3148 // (which will be a definition).
3149 //
3150 // This happens if there is a prototype for a global (e.g.
3151 // "extern int x[];") and then a definition of a different type (e.g.
3152 // "int x[10];"). This also happens when an initializer has a different type
3153 // from the type of the global (this happens with unions).
3154 if (!GV || GV->getType()->getElementType() != InitType ||
3155 GV->getType()->getAddressSpace() !=
3156 getContext().getTargetAddressSpace(GetGlobalVarAddressSpace(D))) {
3157
3158 // Move the old entry aside so that we'll create a new one.
3159 Entry->setName(StringRef());
3160
3161 // Make a new global with the correct type, this is now guaranteed to work.
3162 GV = cast<llvm::GlobalVariable>(
3163 GetAddrOfGlobalVar(D, InitType, ForDefinition_t(!IsTentative)));
3164
3165 // Replace all uses of the old global with the new global
3166 llvm::Constant *NewPtrForOldDecl =
3167 llvm::ConstantExpr::getBitCast(GV, Entry->getType());
3168 Entry->replaceAllUsesWith(NewPtrForOldDecl);
3169
3170 // Erase the old global, since it is no longer used.
3171 cast<llvm::GlobalValue>(Entry)->eraseFromParent();
3172 }
3173
3174 MaybeHandleStaticInExternC(D, GV);
3175
3176 if (D->hasAttr<AnnotateAttr>())
3177 AddGlobalAnnotations(D, GV);
3178
3179 // Set the llvm linkage type as appropriate.
3180 llvm::GlobalValue::LinkageTypes Linkage =
3181 getLLVMLinkageVarDefinition(D, GV->isConstant());
3182
3183 // CUDA B.2.1 "The __device__ qualifier declares a variable that resides on
3184 // the device. [...]"
3185 // CUDA B.2.2 "The __constant__ qualifier, optionally used together with
3186 // __device__, declares a variable that: [...]
3187 // Is accessible from all the threads within the grid and from the host
3188 // through the runtime library (cudaGetSymbolAddress() / cudaGetSymbolSize()
3189 // / cudaMemcpyToSymbol() / cudaMemcpyFromSymbol())."
3190 if (GV && LangOpts.CUDA) {
3191 if (LangOpts.CUDAIsDevice) {
3192 if (D->hasAttr<CUDADeviceAttr>() || D->hasAttr<CUDAConstantAttr>())
3193 GV->setExternallyInitialized(true);
3194 } else {
3195 // Host-side shadows of external declarations of device-side
3196 // global variables become internal definitions. These have to
3197 // be internal in order to prevent name conflicts with global
3198 // host variables with the same name in a different TUs.
3199 if (D->hasAttr<CUDADeviceAttr>() || D->hasAttr<CUDAConstantAttr>()) {
3200 Linkage = llvm::GlobalValue::InternalLinkage;
3201
3202 // Shadow variables and their properties must be registered
3203 // with CUDA runtime.
3204 unsigned Flags = 0;
3205 if (!D->hasDefinition())
3206 Flags |= CGCUDARuntime::ExternDeviceVar;
3207 if (D->hasAttr<CUDAConstantAttr>())
3208 Flags |= CGCUDARuntime::ConstantDeviceVar;
3209 getCUDARuntime().registerDeviceVar(*GV, Flags);
3210 } else if (D->hasAttr<CUDASharedAttr>())
3211 // __shared__ variables are odd. Shadows do get created, but
3212 // they are not registered with the CUDA runtime, so they
3213 // can't really be used to access their device-side
3214 // counterparts. It's not clear yet whether it's nvcc's bug or
3215 // a feature, but we've got to do the same for compatibility.
3216 Linkage = llvm::GlobalValue::InternalLinkage;
3217 }
3218 }
3219
3220 GV->setInitializer(Init);
3221 if (emitter) emitter->finalize(GV);
3222
3223 // If it is safe to mark the global 'constant', do so now.
3224 GV->setConstant(!NeedsGlobalCtor && !NeedsGlobalDtor &&
3225 isTypeConstant(D->getType(), true));
3226
3227 // If it is in a read-only section, mark it 'constant'.
3228 if (const SectionAttr *SA = D->getAttr<SectionAttr>()) {
3229 const ASTContext::SectionInfo &SI = Context.SectionInfos[SA->getName()];
3230 if ((SI.SectionFlags & ASTContext::PSF_Write) == 0)
3231 GV->setConstant(true);
3232 }
3233
3234 GV->setAlignment(getContext().getDeclAlign(D).getQuantity());
3235
3236
3237 // On Darwin, if the normal linkage of a C++ thread_local variable is
3238 // LinkOnce or Weak, we keep the normal linkage to prevent multiple
3239 // copies within a linkage unit; otherwise, the backing variable has
3240 // internal linkage and all accesses should just be calls to the
3241 // Itanium-specified entry point, which has the normal linkage of the
3242 // variable. This is to preserve the ability to change the implementation
3243 // behind the scenes.
3244 if (!D->isStaticLocal() && D->getTLSKind() == VarDecl::TLS_Dynamic &&
3245 Context.getTargetInfo().getTriple().isOSDarwin() &&
3246 !llvm::GlobalVariable::isLinkOnceLinkage(Linkage) &&
3247 !llvm::GlobalVariable::isWeakLinkage(Linkage))
3248 Linkage = llvm::GlobalValue::InternalLinkage;
3249
3250 GV->setLinkage(Linkage);
3251 if (D->hasAttr<DLLImportAttr>())
3252 GV->setDLLStorageClass(llvm::GlobalVariable::DLLImportStorageClass);
3253 else if (D->hasAttr<DLLExportAttr>())
3254 GV->setDLLStorageClass(llvm::GlobalVariable::DLLExportStorageClass);
3255 else
3256 GV->setDLLStorageClass(llvm::GlobalVariable::DefaultStorageClass);
3257
3258 if (Linkage == llvm::GlobalVariable::CommonLinkage) {
3259 // common vars aren't constant even if declared const.
3260 GV->setConstant(false);
3261 // Tentative definition of global variables may be initialized with
3262 // non-zero null pointers. In this case they should have weak linkage
3263 // since common linkage must have zero initializer and must not have
3264 // explicit section therefore cannot have non-zero initial value.
3265 if (!GV->getInitializer()->isNullValue())
3266 GV->setLinkage(llvm::GlobalVariable::WeakAnyLinkage);
3267 }
3268
3269 setNonAliasAttributes(D, GV);
3270
3271 if (D->getTLSKind() && !GV->isThreadLocal()) {
3272 if (D->getTLSKind() == VarDecl::TLS_Dynamic)
3273 CXXThreadLocals.push_back(D);
3274 setTLSMode(GV, *D);
3275 }
3276
3277 maybeSetTrivialComdat(*D, *GV);
3278
3279 // Emit the initializer function if necessary.
3280 if (NeedsGlobalCtor || NeedsGlobalDtor)
3281 EmitCXXGlobalVarDeclInitFunc(D, GV, NeedsGlobalCtor);
3282
3283 SanitizerMD->reportGlobalToASan(GV, *D, NeedsGlobalCtor);
3284
3285 // Emit global variable debug information.
3286 if (CGDebugInfo *DI = getModuleDebugInfo())
3287 if (getCodeGenOpts().getDebugInfo() >= codegenoptions::LimitedDebugInfo)
3288 DI->EmitGlobalVariable(GV, D);
3289}
3290
3291static bool isVarDeclStrongDefinition(const ASTContext &Context,
3292 CodeGenModule &CGM, const VarDecl *D,
3293 bool NoCommon) {
3294 // Don't give variables common linkage if -fno-common was specified unless it
3295 // was overridden by a NoCommon attribute.
3296 if ((NoCommon || D->hasAttr<NoCommonAttr>()) && !D->hasAttr<CommonAttr>())
3297 return true;
3298
3299 // C11 6.9.2/2:
3300 // A declaration of an identifier for an object that has file scope without
3301 // an initializer, and without a storage-class specifier or with the
3302 // storage-class specifier static, constitutes a tentative definition.
3303 if (D->getInit() || D->hasExternalStorage())
3304 return true;
3305
3306 // A variable cannot be both common and exist in a section.
3307 if (D->hasAttr<SectionAttr>())
3308 return true;
3309
3310 // A variable cannot be both common and exist in a section.
3311 // We dont try to determine which is the right section in the front-end.
3312 // If no specialized section name is applicable, it will resort to default.
3313 if (D->hasAttr<PragmaClangBSSSectionAttr>() ||
3314 D->hasAttr<PragmaClangDataSectionAttr>() ||
3315 D->hasAttr<PragmaClangRodataSectionAttr>())
3316 return true;
3317
3318 // Thread local vars aren't considered common linkage.
3319 if (D->getTLSKind())
3320 return true;
3321
3322 // Tentative definitions marked with WeakImportAttr are true definitions.
3323 if (D->hasAttr<WeakImportAttr>())
3324 return true;
3325
3326 // A variable cannot be both common and exist in a comdat.
3327 if (shouldBeInCOMDAT(CGM, *D))
3328 return true;
3329
3330 // Declarations with a required alignment do not have common linkage in MSVC
3331 // mode.
3332 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
3333 if (D->hasAttr<AlignedAttr>())
3334 return true;
3335 QualType VarType = D->getType();
3336 if (Context.isAlignmentRequired(VarType))
3337 return true;
3338
3339 if (const auto *RT = VarType->getAs<RecordType>()) {
3340 const RecordDecl *RD = RT->getDecl();
3341 for (const FieldDecl *FD : RD->fields()) {
3342 if (FD->isBitField())
3343 continue;
3344 if (FD->hasAttr<AlignedAttr>())
3345 return true;
3346 if (Context.isAlignmentRequired(FD->getType()))
3347 return true;
3348 }
3349 }
3350 }
3351
3352 return false;
3353}
3354
3355llvm::GlobalValue::LinkageTypes CodeGenModule::getLLVMLinkageForDeclarator(
3356 const DeclaratorDecl *D, GVALinkage Linkage, bool IsConstantVariable) {
3357 if (Linkage == GVA_Internal)
3358 return llvm::Function::InternalLinkage;
3359
3360 if (D->hasAttr<WeakAttr>()) {
3361 if (IsConstantVariable)
3362 return llvm::GlobalVariable::WeakODRLinkage;
3363 else
3364 return llvm::GlobalVariable::WeakAnyLinkage;
3365 }
3366
3367 // We are guaranteed to have a strong definition somewhere else,
3368 // so we can use available_externally linkage.
3369 if (Linkage == GVA_AvailableExternally)
3370 return llvm::GlobalValue::AvailableExternallyLinkage;
3371
3372 // Note that Apple's kernel linker doesn't support symbol
3373 // coalescing, so we need to avoid linkonce and weak linkages there.
3374 // Normally, this means we just map to internal, but for explicit
3375 // instantiations we'll map to external.
3376
3377 // In C++, the compiler has to emit a definition in every translation unit
3378 // that references the function. We should use linkonce_odr because
3379 // a) if all references in this translation unit are optimized away, we
3380 // don't need to codegen it. b) if the function persists, it needs to be
3381 // merged with other definitions. c) C++ has the ODR, so we know the
3382 // definition is dependable.
3383 if (Linkage == GVA_DiscardableODR)
3384 return !Context.getLangOpts().AppleKext ? llvm::Function::LinkOnceODRLinkage
3385 : llvm::Function::InternalLinkage;
3386
3387 // An explicit instantiation of a template has weak linkage, since
3388 // explicit instantiations can occur in multiple translation units
3389 // and must all be equivalent. However, we are not allowed to
3390 // throw away these explicit instantiations.
3391 //
3392 // We don't currently support CUDA device code spread out across multiple TUs,
3393 // so say that CUDA templates are either external (for kernels) or internal.
3394 // This lets llvm perform aggressive inter-procedural optimizations.
3395 if (Linkage == GVA_StrongODR) {
3396 if (Context.getLangOpts().AppleKext)
3397 return llvm::Function::ExternalLinkage;
3398 if (Context.getLangOpts().CUDA && Context.getLangOpts().CUDAIsDevice)
3399 return D->hasAttr<CUDAGlobalAttr>() ? llvm::Function::ExternalLinkage
3400 : llvm::Function::InternalLinkage;
3401 return llvm::Function::WeakODRLinkage;
3402 }
3403
3404 // C++ doesn't have tentative definitions and thus cannot have common
3405 // linkage.
3406 if (!getLangOpts().CPlusPlus && isa<VarDecl>(D) &&
3407 !isVarDeclStrongDefinition(Context, *this, cast<VarDecl>(D),
3408 CodeGenOpts.NoCommon))
3409 return llvm::GlobalVariable::CommonLinkage;
3410
3411 // selectany symbols are externally visible, so use weak instead of
3412 // linkonce. MSVC optimizes away references to const selectany globals, so
3413 // all definitions should be the same and ODR linkage should be used.
3414 // http://msdn.microsoft.com/en-us/library/5tkz6s71.aspx
3415 if (D->hasAttr<SelectAnyAttr>())
3416 return llvm::GlobalVariable::WeakODRLinkage;
3417
3418 // Otherwise, we have strong external linkage.
3419 assert(Linkage == GVA_StrongExternal)(static_cast <bool> (Linkage == GVA_StrongExternal) ? void
(0) : __assert_fail ("Linkage == GVA_StrongExternal", "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 3419, __extension__ __PRETTY_FUNCTION__))
;
3420 return llvm::GlobalVariable::ExternalLinkage;
3421}
3422
3423llvm::GlobalValue::LinkageTypes CodeGenModule::getLLVMLinkageVarDefinition(
3424 const VarDecl *VD, bool IsConstant) {
3425 GVALinkage Linkage = getContext().GetGVALinkageForVariable(VD);
3426 return getLLVMLinkageForDeclarator(VD, Linkage, IsConstant);
3427}
3428
3429/// Replace the uses of a function that was declared with a non-proto type.
3430/// We want to silently drop extra arguments from call sites
3431static void replaceUsesOfNonProtoConstant(llvm::Constant *old,
3432 llvm::Function *newFn) {
3433 // Fast path.
3434 if (old->use_empty()) return;
3435
3436 llvm::Type *newRetTy = newFn->getReturnType();
3437 SmallVector<llvm::Value*, 4> newArgs;
3438 SmallVector<llvm::OperandBundleDef, 1> newBundles;
3439
3440 for (llvm::Value::use_iterator ui = old->use_begin(), ue = old->use_end();
3441 ui != ue; ) {
3442 llvm::Value::use_iterator use = ui++; // Increment before the use is erased.
3443 llvm::User *user = use->getUser();
3444
3445 // Recognize and replace uses of bitcasts. Most calls to
3446 // unprototyped functions will use bitcasts.
3447 if (auto *bitcast = dyn_cast<llvm::ConstantExpr>(user)) {
3448 if (bitcast->getOpcode() == llvm::Instruction::BitCast)
3449 replaceUsesOfNonProtoConstant(bitcast, newFn);
3450 continue;
3451 }
3452
3453 // Recognize calls to the function.
3454 llvm::CallSite callSite(user);
3455 if (!callSite) continue;
3456 if (!callSite.isCallee(&*use)) continue;
3457
3458 // If the return types don't match exactly, then we can't
3459 // transform this call unless it's dead.
3460 if (callSite->getType() != newRetTy && !callSite->use_empty())
3461 continue;
3462
3463 // Get the call site's attribute list.
3464 SmallVector<llvm::AttributeSet, 8> newArgAttrs;
3465 llvm::AttributeList oldAttrs = callSite.getAttributes();
3466
3467 // If the function was passed too few arguments, don't transform.
3468 unsigned newNumArgs = newFn->arg_size();
3469 if (callSite.arg_size() < newNumArgs) continue;
3470
3471 // If extra arguments were passed, we silently drop them.
3472 // If any of the types mismatch, we don't transform.
3473 unsigned argNo = 0;
3474 bool dontTransform = false;
3475 for (llvm::Argument &A : newFn->args()) {
3476 if (callSite.getArgument(argNo)->getType() != A.getType()) {
3477 dontTransform = true;
3478 break;
3479 }
3480
3481 // Add any parameter attributes.
3482 newArgAttrs.push_back(oldAttrs.getParamAttributes(argNo));
3483 argNo++;
3484 }
3485 if (dontTransform)
3486 continue;
3487
3488 // Okay, we can transform this. Create the new call instruction and copy
3489 // over the required information.
3490 newArgs.append(callSite.arg_begin(), callSite.arg_begin() + argNo);
3491
3492 // Copy over any operand bundles.
3493 callSite.getOperandBundlesAsDefs(newBundles);
3494
3495 llvm::CallSite newCall;
3496 if (callSite.isCall()) {
3497 newCall = llvm::CallInst::Create(newFn, newArgs, newBundles, "",
3498 callSite.getInstruction());
3499 } else {
3500 auto *oldInvoke = cast<llvm::InvokeInst>(callSite.getInstruction());
3501 newCall = llvm::InvokeInst::Create(newFn,
3502 oldInvoke->getNormalDest(),
3503 oldInvoke->getUnwindDest(),
3504 newArgs, newBundles, "",
3505 callSite.getInstruction());
3506 }
3507 newArgs.clear(); // for the next iteration
3508
3509 if (!newCall->getType()->isVoidTy())
3510 newCall->takeName(callSite.getInstruction());
3511 newCall.setAttributes(llvm::AttributeList::get(
3512 newFn->getContext(), oldAttrs.getFnAttributes(),
3513 oldAttrs.getRetAttributes(), newArgAttrs));
3514 newCall.setCallingConv(callSite.getCallingConv());
3515
3516 // Finally, remove the old call, replacing any uses with the new one.
3517 if (!callSite->use_empty())
3518 callSite->replaceAllUsesWith(newCall.getInstruction());
3519
3520 // Copy debug location attached to CI.
3521 if (callSite->getDebugLoc())
3522 newCall->setDebugLoc(callSite->getDebugLoc());
3523
3524 callSite->eraseFromParent();
3525 }
3526}
3527
3528/// ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we
3529/// implement a function with no prototype, e.g. "int foo() {}". If there are
3530/// existing call uses of the old function in the module, this adjusts them to
3531/// call the new function directly.
3532///
3533/// This is not just a cleanup: the always_inline pass requires direct calls to
3534/// functions to be able to inline them. If there is a bitcast in the way, it
3535/// won't inline them. Instcombine normally deletes these calls, but it isn't
3536/// run at -O0.
3537static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old,
3538 llvm::Function *NewFn) {
3539 // If we're redefining a global as a function, don't transform it.
3540 if (!isa<llvm::Function>(Old)) return;
3541
3542 replaceUsesOfNonProtoConstant(Old, NewFn);
3543}
3544
3545void CodeGenModule::HandleCXXStaticMemberVarInstantiation(VarDecl *VD) {
3546 auto DK = VD->isThisDeclarationADefinition();
3547 if (DK == VarDecl::Definition && VD->hasAttr<DLLImportAttr>())
3548 return;
3549
3550 TemplateSpecializationKind TSK = VD->getTemplateSpecializationKind();
3551 // If we have a definition, this might be a deferred decl. If the
3552 // instantiation is explicit, make sure we emit it at the end.
3553 if (VD->getDefinition() && TSK == TSK_ExplicitInstantiationDefinition)
3554 GetAddrOfGlobalVar(VD);
3555
3556 EmitTopLevelDecl(VD);
3557}
3558
3559void CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD,
3560 llvm::GlobalValue *GV) {
3561 const auto *D = cast<FunctionDecl>(GD.getDecl());
3562
3563 // Compute the function info and LLVM type.
3564 const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
3565 llvm::FunctionType *Ty = getTypes().GetFunctionType(FI);
3566
3567 // Get or create the prototype for the function.
3568 if (!GV || (GV->getType()->getElementType() != Ty))
3569 GV = cast<llvm::GlobalValue>(GetAddrOfFunction(GD, Ty, /*ForVTable=*/false,
3570 /*DontDefer=*/true,
3571 ForDefinition));
3572
3573 // Already emitted.
3574 if (!GV->isDeclaration())
3575 return;
3576
3577 // We need to set linkage and visibility on the function before
3578 // generating code for it because various parts of IR generation
3579 // want to propagate this information down (e.g. to local static
3580 // declarations).
3581 auto *Fn = cast<llvm::Function>(GV);
3582 setFunctionLinkage(GD, Fn);
3583 setFunctionDLLStorageClass(GD, Fn);
3584
3585 // FIXME: this is redundant with part of setFunctionDefinitionAttributes
3586 setGVProperties(Fn, D);
3587
3588 MaybeHandleStaticInExternC(D, Fn);
3589
3590 maybeSetTrivialComdat(*D, *Fn);
3591
3592 CodeGenFunction(*this).GenerateCode(D, Fn, FI);
3593
3594 setFunctionDefinitionAttributes(D, Fn);
3595 SetLLVMFunctionAttributesForDefinition(D, Fn);
3596
3597 if (const ConstructorAttr *CA = D->getAttr<ConstructorAttr>())
3598 AddGlobalCtor(Fn, CA->getPriority());
3599 if (const DestructorAttr *DA = D->getAttr<DestructorAttr>())
3600 AddGlobalDtor(Fn, DA->getPriority());
3601 if (D->hasAttr<AnnotateAttr>())
3602 AddGlobalAnnotations(D, Fn);
3603}
3604
3605void CodeGenModule::EmitAliasDefinition(GlobalDecl GD) {
3606 const auto *D = cast<ValueDecl>(GD.getDecl());
3607 const AliasAttr *AA = D->getAttr<AliasAttr>();
3608 assert(AA && "Not an alias?")(static_cast <bool> (AA && "Not an alias?") ? void
(0) : __assert_fail ("AA && \"Not an alias?\"", "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 3608, __extension__ __PRETTY_FUNCTION__))
;
3609
3610 StringRef MangledName = getMangledName(GD);
3611
3612 if (AA->getAliasee() == MangledName) {
3613 Diags.Report(AA->getLocation(), diag::err_cyclic_alias) << 0;
3614 return;
3615 }
3616
3617 // If there is a definition in the module, then it wins over the alias.
3618 // This is dubious, but allow it to be safe. Just ignore the alias.
3619 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
3620 if (Entry && !Entry->isDeclaration())
3621 return;
3622
3623 Aliases.push_back(GD);
3624
3625 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType());
3626
3627 // Create a reference to the named value. This ensures that it is emitted
3628 // if a deferred decl.
3629 llvm::Constant *Aliasee;
3630 if (isa<llvm::FunctionType>(DeclTy))
3631 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy, GD,
3632 /*ForVTable=*/false);
3633 else
3634 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
3635 llvm::PointerType::getUnqual(DeclTy),
3636 /*D=*/nullptr);
3637
3638 // Create the new alias itself, but don't set a name yet.
3639 auto *GA = llvm::GlobalAlias::create(
3640 DeclTy, 0, llvm::Function::ExternalLinkage, "", Aliasee, &getModule());
3641
3642 if (Entry) {
3643 if (GA->getAliasee() == Entry) {
3644 Diags.Report(AA->getLocation(), diag::err_cyclic_alias) << 0;
3645 return;
3646 }
3647
3648 assert(Entry->isDeclaration())(static_cast <bool> (Entry->isDeclaration()) ? void (
0) : __assert_fail ("Entry->isDeclaration()", "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 3648, __extension__ __PRETTY_FUNCTION__))
;
3649
3650 // If there is a declaration in the module, then we had an extern followed
3651 // by the alias, as in:
3652 // extern int test6();
3653 // ...
3654 // int test6() __attribute__((alias("test7")));
3655 //
3656 // Remove it and replace uses of it with the alias.
3657 GA->takeName(Entry);
3658
3659 Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GA,
3660 Entry->getType()));
3661 Entry->eraseFromParent();
3662 } else {
3663 GA->setName(MangledName);
3664 }
3665
3666 // Set attributes which are particular to an alias; this is a
3667 // specialization of the attributes which may be set on a global
3668 // variable/function.
3669 if (D->hasAttr<WeakAttr>() || D->hasAttr<WeakRefAttr>() ||
3670 D->isWeakImported()) {
3671 GA->setLinkage(llvm::Function::WeakAnyLinkage);
3672 }
3673
3674 if (const auto *VD = dyn_cast<VarDecl>(D))
3675 if (VD->getTLSKind())
3676 setTLSMode(GA, *VD);
3677
3678 setAliasAttributes(D, GA);
3679}
3680
3681void CodeGenModule::emitIFuncDefinition(GlobalDecl GD) {
3682 const auto *D = cast<ValueDecl>(GD.getDecl());
3683 const IFuncAttr *IFA = D->getAttr<IFuncAttr>();
3684 assert(IFA && "Not an ifunc?")(static_cast <bool> (IFA && "Not an ifunc?") ? void
(0) : __assert_fail ("IFA && \"Not an ifunc?\"", "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 3684, __extension__ __PRETTY_FUNCTION__))
;
3685
3686 StringRef MangledName = getMangledName(GD);
3687
3688 if (IFA->getResolver() == MangledName) {
3689 Diags.Report(IFA->getLocation(), diag::err_cyclic_alias) << 1;
3690 return;
3691 }
3692
3693 // Report an error if some definition overrides ifunc.
3694 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
3695 if (Entry && !Entry->isDeclaration()) {
3696 GlobalDecl OtherGD;
3697 if (lookupRepresentativeDecl(MangledName, OtherGD) &&
3698 DiagnosedConflictingDefinitions.insert(GD).second) {
3699 Diags.Report(D->getLocation(), diag::err_duplicate_mangled_name);
3700 Diags.Report(OtherGD.getDecl()->getLocation(),
3701 diag::note_previous_definition);
3702 }
3703 return;
3704 }
3705
3706 Aliases.push_back(GD);
3707
3708 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType());
3709 llvm::Constant *Resolver =
3710 GetOrCreateLLVMFunction(IFA->getResolver(), DeclTy, GD,
3711 /*ForVTable=*/false);
3712 llvm::GlobalIFunc *GIF =
3713 llvm::GlobalIFunc::create(DeclTy, 0, llvm::Function::ExternalLinkage,
3714 "", Resolver, &getModule());
3715 if (Entry) {
3716 if (GIF->getResolver() == Entry) {
3717 Diags.Report(IFA->getLocation(), diag::err_cyclic_alias) << 1;
3718 return;
3719 }
3720 assert(Entry->isDeclaration())(static_cast <bool> (Entry->isDeclaration()) ? void (
0) : __assert_fail ("Entry->isDeclaration()", "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 3720, __extension__ __PRETTY_FUNCTION__))
;
3721
3722 // If there is a declaration in the module, then we had an extern followed
3723 // by the ifunc, as in:
3724 // extern int test();
3725 // ...
3726 // int test() __attribute__((ifunc("resolver")));
3727 //
3728 // Remove it and replace uses of it with the ifunc.
3729 GIF->takeName(Entry);
3730
3731 Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GIF,
3732 Entry->getType()));
3733 Entry->eraseFromParent();
3734 } else
3735 GIF->setName(MangledName);
3736
3737 SetCommonAttributes(D, GIF);
3738}
3739
3740llvm::Function *CodeGenModule::getIntrinsic(unsigned IID,
3741 ArrayRef<llvm::Type*> Tys) {
3742 return llvm::Intrinsic::getDeclaration(&getModule(), (llvm::Intrinsic::ID)IID,
3743 Tys);
3744}
3745
3746static llvm::StringMapEntry<llvm::GlobalVariable *> &
3747GetConstantCFStringEntry(llvm::StringMap<llvm::GlobalVariable *> &Map,
3748 const StringLiteral *Literal, bool TargetIsLSB,
3749 bool &IsUTF16, unsigned &StringLength) {
3750 StringRef String = Literal->getString();
3751 unsigned NumBytes = String.size();
3752
3753 // Check for simple case.
3754 if (!Literal->containsNonAsciiOrNull()) {
3755 StringLength = NumBytes;
3756 return *Map.insert(std::make_pair(String, nullptr)).first;
3757 }
3758
3759 // Otherwise, convert the UTF8 literals into a string of shorts.
3760 IsUTF16 = true;
3761
3762 SmallVector<llvm::UTF16, 128> ToBuf(NumBytes + 1); // +1 for ending nulls.
3763 const llvm::UTF8 *FromPtr = (const llvm::UTF8 *)String.data();
3764 llvm::UTF16 *ToPtr = &ToBuf[0];
3765
3766 (void)llvm::ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes, &ToPtr,
3767 ToPtr + NumBytes, llvm::strictConversion);
3768
3769 // ConvertUTF8toUTF16 returns the length in ToPtr.
3770 StringLength = ToPtr - &ToBuf[0];
3771
3772 // Add an explicit null.
3773 *ToPtr = 0;
3774 return *Map.insert(std::make_pair(
3775 StringRef(reinterpret_cast<const char *>(ToBuf.data()),
3776 (StringLength + 1) * 2),
3777 nullptr)).first;
3778}
3779
3780ConstantAddress
3781CodeGenModule::GetAddrOfConstantCFString(const StringLiteral *Literal) {
3782 unsigned StringLength = 0;
3783 bool isUTF16 = false;
3784 llvm::StringMapEntry<llvm::GlobalVariable *> &Entry =
3785 GetConstantCFStringEntry(CFConstantStringMap, Literal,
3786 getDataLayout().isLittleEndian(), isUTF16,
3787 StringLength);
3788
3789 if (auto *C = Entry.second)
3790 return ConstantAddress(C, CharUnits::fromQuantity(C->getAlignment()));
3791
3792 llvm::Constant *Zero = llvm::Constant::getNullValue(Int32Ty);
3793 llvm::Constant *Zeros[] = { Zero, Zero };
3794
3795 // If we don't already have it, get __CFConstantStringClassReference.
3796 if (!CFConstantStringClassRef) {
3797 llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy);
3798 Ty = llvm::ArrayType::get(Ty, 0);
3799 llvm::Constant *GV =
3800 CreateRuntimeVariable(Ty, "__CFConstantStringClassReference");
3801
3802 if (getTriple().isOSBinFormatCOFF()) {
3803 IdentifierInfo &II = getContext().Idents.get(GV->getName());
3804 TranslationUnitDecl *TUDecl = getContext().getTranslationUnitDecl();
3805 DeclContext *DC = TranslationUnitDecl::castToDeclContext(TUDecl);
3806 llvm::GlobalValue *CGV = cast<llvm::GlobalValue>(GV);
3807
3808 const VarDecl *VD = nullptr;
3809 for (const auto &Result : DC->lookup(&II))
3810 if ((VD = dyn_cast<VarDecl>(Result)))
3811 break;
3812
3813 if (!VD || !VD->hasAttr<DLLExportAttr>()) {
3814 CGV->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
3815 CGV->setLinkage(llvm::GlobalValue::ExternalLinkage);
3816 } else {
3817 CGV->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
3818 CGV->setLinkage(llvm::GlobalValue::ExternalLinkage);
3819 }
3820 }
3821
3822 // Decay array -> ptr
3823 CFConstantStringClassRef =
3824 llvm::ConstantExpr::getGetElementPtr(Ty, GV, Zeros);
3825 }
3826
3827 QualType CFTy = getContext().getCFConstantStringType();
3828
3829 auto *STy = cast<llvm::StructType>(getTypes().ConvertType(CFTy));
3830
3831 ConstantInitBuilder Builder(*this);
3832 auto Fields = Builder.beginStruct(STy);
3833
3834 // Class pointer.
3835 Fields.add(cast<llvm::ConstantExpr>(CFConstantStringClassRef));
3836
3837 // Flags.
3838 Fields.addInt(IntTy, isUTF16 ? 0x07d0 : 0x07C8);
3839
3840 // String pointer.
3841 llvm::Constant *C = nullptr;
3842 if (isUTF16) {
3843 auto Arr = llvm::makeArrayRef(
3844 reinterpret_cast<uint16_t *>(const_cast<char *>(Entry.first().data())),
3845 Entry.first().size() / 2);
3846 C = llvm::ConstantDataArray::get(VMContext, Arr);
3847 } else {
3848 C = llvm::ConstantDataArray::getString(VMContext, Entry.first());
3849 }
3850
3851 // Note: -fwritable-strings doesn't make the backing store strings of
3852 // CFStrings writable. (See <rdar://problem/10657500>)
3853 auto *GV =
3854 new llvm::GlobalVariable(getModule(), C->getType(), /*isConstant=*/true,
3855 llvm::GlobalValue::PrivateLinkage, C, ".str");
3856 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
3857 // Don't enforce the target's minimum global alignment, since the only use
3858 // of the string is via this class initializer.
3859 CharUnits Align = isUTF16
3860 ? getContext().getTypeAlignInChars(getContext().ShortTy)
3861 : getContext().getTypeAlignInChars(getContext().CharTy);
3862 GV->setAlignment(Align.getQuantity());
3863
3864 // FIXME: We set the section explicitly to avoid a bug in ld64 224.1.
3865 // Without it LLVM can merge the string with a non unnamed_addr one during
3866 // LTO. Doing that changes the section it ends in, which surprises ld64.
3867 if (getTriple().isOSBinFormatMachO())
3868 GV->setSection(isUTF16 ? "__TEXT,__ustring"
3869 : "__TEXT,__cstring,cstring_literals");
3870
3871 // String.
3872 llvm::Constant *Str =
3873 llvm::ConstantExpr::getGetElementPtr(GV->getValueType(), GV, Zeros);
3874
3875 if (isUTF16)
3876 // Cast the UTF16 string to the correct type.
3877 Str = llvm::ConstantExpr::getBitCast(Str, Int8PtrTy);
3878 Fields.add(Str);
3879
3880 // String length.
3881 auto Ty = getTypes().ConvertType(getContext().LongTy);
3882 Fields.addInt(cast<llvm::IntegerType>(Ty), StringLength);
3883
3884 CharUnits Alignment = getPointerAlign();
3885
3886 // The struct.
3887 GV = Fields.finishAndCreateGlobal("_unnamed_cfstring_", Alignment,
3888 /*isConstant=*/false,
3889 llvm::GlobalVariable::PrivateLinkage);
3890 switch (getTriple().getObjectFormat()) {
3891 case llvm::Triple::UnknownObjectFormat:
3892 llvm_unreachable("unknown file format")::llvm::llvm_unreachable_internal("unknown file format", "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 3892)
;
3893 case llvm::Triple::COFF:
3894 case llvm::Triple::ELF:
3895 case llvm::Triple::Wasm:
3896 GV->setSection("cfstring");
3897 break;
3898 case llvm::Triple::MachO:
3899 GV->setSection("__DATA,__cfstring");
3900 break;
3901 }
3902 Entry.second = GV;
3903
3904 return ConstantAddress(GV, Alignment);
3905}
3906
3907bool CodeGenModule::getExpressionLocationsEnabled() const {
3908 return !CodeGenOpts.EmitCodeView || CodeGenOpts.DebugColumnInfo;
3909}
3910
3911QualType CodeGenModule::getObjCFastEnumerationStateType() {
3912 if (ObjCFastEnumerationStateType.isNull()) {
3913 RecordDecl *D = Context.buildImplicitRecord("__objcFastEnumerationState");
3914 D->startDefinition();
3915
3916 QualType FieldTypes[] = {
3917 Context.UnsignedLongTy,
3918 Context.getPointerType(Context.getObjCIdType()),
3919 Context.getPointerType(Context.UnsignedLongTy),
3920 Context.getConstantArrayType(Context.UnsignedLongTy,
3921 llvm::APInt(32, 5), ArrayType::Normal, 0)
3922 };
3923
3924 for (size_t i = 0; i < 4; ++i) {
3925 FieldDecl *Field = FieldDecl::Create(Context,
3926 D,
3927 SourceLocation(),
3928 SourceLocation(), nullptr,
3929 FieldTypes[i], /*TInfo=*/nullptr,
3930 /*BitWidth=*/nullptr,
3931 /*Mutable=*/false,
3932 ICIS_NoInit);
3933 Field->setAccess(AS_public);
3934 D->addDecl(Field);
3935 }
3936
3937 D->completeDefinition();
3938 ObjCFastEnumerationStateType = Context.getTagDeclType(D);
3939 }
3940
3941 return ObjCFastEnumerationStateType;
3942}
3943
3944llvm::Constant *
3945CodeGenModule::GetConstantArrayFromStringLiteral(const StringLiteral *E) {
3946 assert(!E->getType()->isPointerType() && "Strings are always arrays")(static_cast <bool> (!E->getType()->isPointerType
() && "Strings are always arrays") ? void (0) : __assert_fail
("!E->getType()->isPointerType() && \"Strings are always arrays\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 3946, __extension__ __PRETTY_FUNCTION__))
;
3947
3948 // Don't emit it as the address of the string, emit the string data itself
3949 // as an inline array.
3950 if (E->getCharByteWidth() == 1) {
3951 SmallString<64> Str(E->getString());
3952
3953 // Resize the string to the right size, which is indicated by its type.
3954 const ConstantArrayType *CAT = Context.getAsConstantArrayType(E->getType());
3955 Str.resize(CAT->getSize().getZExtValue());
3956 return llvm::ConstantDataArray::getString(VMContext, Str, false);
3957 }
3958
3959 auto *AType = cast<llvm::ArrayType>(getTypes().ConvertType(E->getType()));
3960 llvm::Type *ElemTy = AType->getElementType();
3961 unsigned NumElements = AType->getNumElements();
3962
3963 // Wide strings have either 2-byte or 4-byte elements.
3964 if (ElemTy->getPrimitiveSizeInBits() == 16) {
3965 SmallVector<uint16_t, 32> Elements;
3966 Elements.reserve(NumElements);
3967
3968 for(unsigned i = 0, e = E->getLength(); i != e; ++i)
3969 Elements.push_back(E->getCodeUnit(i));
3970 Elements.resize(NumElements);
3971 return llvm::ConstantDataArray::get(VMContext, Elements);
3972 }
3973
3974 assert(ElemTy->getPrimitiveSizeInBits() == 32)(static_cast <bool> (ElemTy->getPrimitiveSizeInBits(
) == 32) ? void (0) : __assert_fail ("ElemTy->getPrimitiveSizeInBits() == 32"
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 3974, __extension__ __PRETTY_FUNCTION__))
;
3975 SmallVector<uint32_t, 32> Elements;
3976 Elements.reserve(NumElements);
3977
3978 for(unsigned i = 0, e = E->getLength(); i != e; ++i)
3979 Elements.push_back(E->getCodeUnit(i));
3980 Elements.resize(NumElements);
3981 return llvm::ConstantDataArray::get(VMContext, Elements);
3982}
3983
3984static llvm::GlobalVariable *
3985GenerateStringLiteral(llvm::Constant *C, llvm::GlobalValue::LinkageTypes LT,
3986 CodeGenModule &CGM, StringRef GlobalName,
3987 CharUnits Alignment) {
3988 // OpenCL v1.2 s6.5.3: a string literal is in the constant address space.
3989 unsigned AddrSpace = 0;
3990 if (CGM.getLangOpts().OpenCL)
3991 AddrSpace = CGM.getContext().getTargetAddressSpace(LangAS::opencl_constant);
3992
3993 llvm::Module &M = CGM.getModule();
3994 // Create a global variable for this string
3995 auto *GV = new llvm::GlobalVariable(
3996 M, C->getType(), !CGM.getLangOpts().WritableStrings, LT, C, GlobalName,
3997 nullptr, llvm::GlobalVariable::NotThreadLocal, AddrSpace);
3998 GV->setAlignment(Alignment.getQuantity());
3999 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
4000 if (GV->isWeakForLinker()) {
4001 assert(CGM.supportsCOMDAT() && "Only COFF uses weak string literals")(static_cast <bool> (CGM.supportsCOMDAT() && "Only COFF uses weak string literals"
) ? void (0) : __assert_fail ("CGM.supportsCOMDAT() && \"Only COFF uses weak string literals\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 4001, __extension__ __PRETTY_FUNCTION__))
;
4002 GV->setComdat(M.getOrInsertComdat(GV->getName()));
4003 }
4004
4005 return GV;
4006}
4007
4008/// GetAddrOfConstantStringFromLiteral - Return a pointer to a
4009/// constant array for the given string literal.
4010ConstantAddress
4011CodeGenModule::GetAddrOfConstantStringFromLiteral(const StringLiteral *S,
4012 StringRef Name) {
4013 CharUnits Alignment = getContext().getAlignOfGlobalVarInChars(S->getType());
4014
4015 llvm::Constant *C = GetConstantArrayFromStringLiteral(S);
4016 llvm::GlobalVariable **Entry = nullptr;
4017 if (!LangOpts.WritableStrings) {
4018 Entry = &ConstantStringMap[C];
4019 if (auto GV = *Entry) {
4020 if (Alignment.getQuantity() > GV->getAlignment())
4021 GV->setAlignment(Alignment.getQuantity());
4022 return ConstantAddress(GV, Alignment);
4023 }
4024 }
4025
4026 SmallString<256> MangledNameBuffer;
4027 StringRef GlobalVariableName;
4028 llvm::GlobalValue::LinkageTypes LT;
4029
4030 // Mangle the string literal if the ABI allows for it. However, we cannot
4031 // do this if we are compiling with ASan or -fwritable-strings because they
4032 // rely on strings having normal linkage.
4033 if (!LangOpts.WritableStrings &&
4034 !LangOpts.Sanitize.has(SanitizerKind::Address) &&
4035 getCXXABI().getMangleContext().shouldMangleStringLiteral(S)) {
4036 llvm::raw_svector_ostream Out(MangledNameBuffer);
4037 getCXXABI().getMangleContext().mangleStringLiteral(S, Out);
4038
4039 LT = llvm::GlobalValue::LinkOnceODRLinkage;
4040 GlobalVariableName = MangledNameBuffer;
4041 } else {
4042 LT = llvm::GlobalValue::PrivateLinkage;
4043 GlobalVariableName = Name;
4044 }
4045
4046 auto GV = GenerateStringLiteral(C, LT, *this, GlobalVariableName, Alignment);
4047 if (Entry)
4048 *Entry = GV;
4049
4050 SanitizerMD->reportGlobalToASan(GV, S->getStrTokenLoc(0), "<string literal>",
4051 QualType());
4052 return ConstantAddress(GV, Alignment);
4053}
4054
4055/// GetAddrOfConstantStringFromObjCEncode - Return a pointer to a constant
4056/// array for the given ObjCEncodeExpr node.
4057ConstantAddress
4058CodeGenModule::GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *E) {
4059 std::string Str;
4060 getContext().getObjCEncodingForType(E->getEncodedType(), Str);
4061
4062 return GetAddrOfConstantCString(Str);
4063}
4064
4065/// GetAddrOfConstantCString - Returns a pointer to a character array containing
4066/// the literal and a terminating '\0' character.
4067/// The result has pointer to array type.
4068ConstantAddress CodeGenModule::GetAddrOfConstantCString(
4069 const std::string &Str, const char *GlobalName) {
4070 StringRef StrWithNull(Str.c_str(), Str.size() + 1);
4071 CharUnits Alignment =
4072 getContext().getAlignOfGlobalVarInChars(getContext().CharTy);
4073
4074 llvm::Constant *C =
4075 llvm::ConstantDataArray::getString(getLLVMContext(), StrWithNull, false);
4076
4077 // Don't share any string literals if strings aren't constant.
4078 llvm::GlobalVariable **Entry = nullptr;
4079 if (!LangOpts.WritableStrings) {
4080 Entry = &ConstantStringMap[C];
4081 if (auto GV = *Entry) {
4082 if (Alignment.getQuantity() > GV->getAlignment())
4083 GV->setAlignment(Alignment.getQuantity());
4084 return ConstantAddress(GV, Alignment);
4085 }
4086 }
4087
4088 // Get the default prefix if a name wasn't specified.
4089 if (!GlobalName)
4090 GlobalName = ".str";
4091 // Create a global variable for this.
4092 auto GV = GenerateStringLiteral(C, llvm::GlobalValue::PrivateLinkage, *this,
4093 GlobalName, Alignment);
4094 if (Entry)
4095 *Entry = GV;
4096 return ConstantAddress(GV, Alignment);
4097}
4098
4099ConstantAddress CodeGenModule::GetAddrOfGlobalTemporary(
4100 const MaterializeTemporaryExpr *E, const Expr *Init) {
4101 assert((E->getStorageDuration() == SD_Static ||(static_cast <bool> ((E->getStorageDuration() == SD_Static
|| E->getStorageDuration() == SD_Thread) && "not a global temporary"
) ? void (0) : __assert_fail ("(E->getStorageDuration() == SD_Static || E->getStorageDuration() == SD_Thread) && \"not a global temporary\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 4102, __extension__ __PRETTY_FUNCTION__))
4102 E->getStorageDuration() == SD_Thread) && "not a global temporary")(static_cast <bool> ((E->getStorageDuration() == SD_Static
|| E->getStorageDuration() == SD_Thread) && "not a global temporary"
) ? void (0) : __assert_fail ("(E->getStorageDuration() == SD_Static || E->getStorageDuration() == SD_Thread) && \"not a global temporary\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 4102, __extension__ __PRETTY_FUNCTION__))
;
4103 const auto *VD = cast<VarDecl>(E->getExtendingDecl());
1
Calling 'cast'
26
Returning from 'cast'
27
'VD' initialized here
4104
4105 // If we're not materializing a subobject of the temporary, keep the
4106 // cv-qualifiers from the type of the MaterializeTemporaryExpr.
4107 QualType MaterializedType = Init->getType();
4108 if (Init == E->GetTemporaryExpr())
28
Assuming the condition is false
29
Taking false branch
4109 MaterializedType = E->getType();
4110
4111 CharUnits Align = getContext().getTypeAlignInChars(MaterializedType);
4112
4113 if (llvm::Constant *Slot = MaterializedGlobalTemporaryMap[E])
30
Assuming 'Slot' is null
31
Taking false branch
4114 return ConstantAddress(Slot, Align);
4115
4116 // FIXME: If an externally-visible declaration extends multiple temporaries,
4117 // we need to give each temporary the same name in every translation unit (and
4118 // we also need to make the temporaries externally-visible).
4119 SmallString<256> Name;
4120 llvm::raw_svector_ostream Out(Name);
4121 getCXXABI().getMangleContext().mangleReferenceTemporary(
4122 VD, E->getManglingNumber(), Out);
4123
4124 APValue *Value = nullptr;
4125 if (E->getStorageDuration() == SD_Static) {
32
Taking true branch
4126 // We might have a cached constant initializer for this temporary. Note
4127 // that this might have a different value from the value computed by
4128 // evaluating the initializer if the surrounding constant expression
4129 // modifies the temporary.
4130 Value = getContext().getMaterializedTemporaryValue(E, false);
4131 if (Value && Value->isUninit())
33
Assuming 'Value' is null
4132 Value = nullptr;
4133 }
4134
4135 // Try evaluating it now, it might have a constant initializer.
4136 Expr::EvalResult EvalResult;
4137 if (!Value && Init->EvaluateAsRValue(EvalResult, getContext()) &&
34
Assuming the condition is false
4138 !EvalResult.hasSideEffects())
4139 Value = &EvalResult.Val;
4140
4141 LangAS AddrSpace =
4142 VD ? GetGlobalVarAddressSpace(VD) : MaterializedType.getAddressSpace();
35
Assuming 'VD' is null
36
'?' condition is false
4143
4144 Optional<ConstantEmitter> emitter;
4145 llvm::Constant *InitialValue = nullptr;
4146 bool Constant = false;
4147 llvm::Type *Type;
4148 if (Value) {
37
Taking false branch
4149 // The temporary has a constant initializer, use it.
4150 emitter.emplace(*this);
4151 InitialValue = emitter->emitForInitializer(*Value, AddrSpace,
4152 MaterializedType);
4153 Constant = isTypeConstant(MaterializedType, /*ExcludeCtor*/Value);
4154 Type = InitialValue->getType();
4155 } else {
4156 // No initializer, the initialization will be provided when we
4157 // initialize the declaration which performed lifetime extension.
4158 Type = getTypes().ConvertTypeForMem(MaterializedType);
4159 }
4160
4161 // Create a global variable for this lifetime-extended temporary.
4162 llvm::GlobalValue::LinkageTypes Linkage =
4163 getLLVMLinkageVarDefinition(VD, Constant);
4164 if (Linkage == llvm::GlobalVariable::ExternalLinkage) {
38
Taking false branch
4165 const VarDecl *InitVD;
4166 if (VD->isStaticDataMember() && VD->getAnyInitializer(InitVD) &&
4167 isa<CXXRecordDecl>(InitVD->getLexicalDeclContext())) {
4168 // Temporaries defined inside a class get linkonce_odr linkage because the
4169 // class can be defined in multipe translation units.
4170 Linkage = llvm::GlobalVariable::LinkOnceODRLinkage;
4171 } else {
4172 // There is no need for this temporary to have external linkage if the
4173 // VarDecl has external linkage.
4174 Linkage = llvm::GlobalVariable::InternalLinkage;
4175 }
4176 }
4177 auto TargetAS = getContext().getTargetAddressSpace(AddrSpace);
4178 auto *GV = new llvm::GlobalVariable(
4179 getModule(), Type, Constant, Linkage, InitialValue, Name.c_str(),
4180 /*InsertBefore=*/nullptr, llvm::GlobalVariable::NotThreadLocal, TargetAS);
4181 if (emitter) emitter->finalize(GV);
39
Taking false branch
4182 setGVProperties(GV, VD);
4183 GV->setAlignment(Align.getQuantity());
4184 if (supportsCOMDAT() && GV->isWeakForLinker())
40
Assuming the condition is false
4185 GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
4186 if (VD->getTLSKind())
41
Called C++ object pointer is null
4187 setTLSMode(GV, *VD);
4188 llvm::Constant *CV = GV;
4189 if (AddrSpace != LangAS::Default)
4190 CV = getTargetCodeGenInfo().performAddrSpaceCast(
4191 *this, GV, AddrSpace, LangAS::Default,
4192 Type->getPointerTo(
4193 getContext().getTargetAddressSpace(LangAS::Default)));
4194 MaterializedGlobalTemporaryMap[E] = CV;
4195 return ConstantAddress(CV, Align);
4196}
4197
4198/// EmitObjCPropertyImplementations - Emit information for synthesized
4199/// properties for an implementation.
4200void CodeGenModule::EmitObjCPropertyImplementations(const
4201 ObjCImplementationDecl *D) {
4202 for (const auto *PID : D->property_impls()) {
4203 // Dynamic is just for type-checking.
4204 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) {
4205 ObjCPropertyDecl *PD = PID->getPropertyDecl();
4206
4207 // Determine which methods need to be implemented, some may have
4208 // been overridden. Note that ::isPropertyAccessor is not the method
4209 // we want, that just indicates if the decl came from a
4210 // property. What we want to know is if the method is defined in
4211 // this implementation.
4212 if (!D->getInstanceMethod(PD->getGetterName()))
4213 CodeGenFunction(*this).GenerateObjCGetter(
4214 const_cast<ObjCImplementationDecl *>(D), PID);
4215 if (!PD->isReadOnly() &&
4216 !D->getInstanceMethod(PD->getSetterName()))
4217 CodeGenFunction(*this).GenerateObjCSetter(
4218 const_cast<ObjCImplementationDecl *>(D), PID);
4219 }
4220 }
4221}
4222
4223static bool needsDestructMethod(ObjCImplementationDecl *impl) {
4224 const ObjCInterfaceDecl *iface = impl->getClassInterface();
4225 for (const ObjCIvarDecl *ivar = iface->all_declared_ivar_begin();
4226 ivar; ivar = ivar->getNextIvar())
4227 if (ivar->getType().isDestructedType())
4228 return true;
4229
4230 return false;
4231}
4232
4233static bool AllTrivialInitializers(CodeGenModule &CGM,
4234 ObjCImplementationDecl *D) {
4235 CodeGenFunction CGF(CGM);
4236 for (ObjCImplementationDecl::init_iterator B = D->init_begin(),
4237 E = D->init_end(); B != E; ++B) {
4238 CXXCtorInitializer *CtorInitExp = *B;
4239 Expr *Init = CtorInitExp->getInit();
4240 if (!CGF.isTrivialInitializer(Init))
4241 return false;
4242 }
4243 return true;
4244}
4245
4246/// EmitObjCIvarInitializations - Emit information for ivar initialization
4247/// for an implementation.
4248void CodeGenModule::EmitObjCIvarInitializations(ObjCImplementationDecl *D) {
4249 // We might need a .cxx_destruct even if we don't have any ivar initializers.
4250 if (needsDestructMethod(D)) {
4251 IdentifierInfo *II = &getContext().Idents.get(".cxx_destruct");
4252 Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
4253 ObjCMethodDecl *DTORMethod =
4254 ObjCMethodDecl::Create(getContext(), D->getLocation(), D->getLocation(),
4255 cxxSelector, getContext().VoidTy, nullptr, D,
4256 /*isInstance=*/true, /*isVariadic=*/false,
4257 /*isPropertyAccessor=*/true, /*isImplicitlyDeclared=*/true,
4258 /*isDefined=*/false, ObjCMethodDecl::Required);
4259 D->addInstanceMethod(DTORMethod);
4260 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, DTORMethod, false);
4261 D->setHasDestructors(true);
4262 }
4263
4264 // If the implementation doesn't have any ivar initializers, we don't need
4265 // a .cxx_construct.
4266 if (D->getNumIvarInitializers() == 0 ||
4267 AllTrivialInitializers(*this, D))
4268 return;
4269
4270 IdentifierInfo *II = &getContext().Idents.get(".cxx_construct");
4271 Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
4272 // The constructor returns 'self'.
4273 ObjCMethodDecl *CTORMethod = ObjCMethodDecl::Create(getContext(),
4274 D->getLocation(),
4275 D->getLocation(),
4276 cxxSelector,
4277 getContext().getObjCIdType(),
4278 nullptr, D, /*isInstance=*/true,
4279 /*isVariadic=*/false,
4280 /*isPropertyAccessor=*/true,
4281 /*isImplicitlyDeclared=*/true,
4282 /*isDefined=*/false,
4283 ObjCMethodDecl::Required);
4284 D->addInstanceMethod(CTORMethod);
4285 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, CTORMethod, true);
4286 D->setHasNonZeroConstructors(true);
4287}
4288
4289// EmitLinkageSpec - Emit all declarations in a linkage spec.
4290void CodeGenModule::EmitLinkageSpec(const LinkageSpecDecl *LSD) {
4291 if (LSD->getLanguage() != LinkageSpecDecl::lang_c &&
4292 LSD->getLanguage() != LinkageSpecDecl::lang_cxx) {
4293 ErrorUnsupported(LSD, "linkage spec");
4294 return;
4295 }
4296
4297 EmitDeclContext(LSD);
4298}
4299
4300void CodeGenModule::EmitDeclContext(const DeclContext *DC) {
4301 for (auto *I : DC->decls()) {
4302 // Unlike other DeclContexts, the contents of an ObjCImplDecl at TU scope
4303 // are themselves considered "top-level", so EmitTopLevelDecl on an
4304 // ObjCImplDecl does not recursively visit them. We need to do that in
4305 // case they're nested inside another construct (LinkageSpecDecl /
4306 // ExportDecl) that does stop them from being considered "top-level".
4307 if (auto *OID = dyn_cast<ObjCImplDecl>(I)) {
4308 for (auto *M : OID->methods())
4309 EmitTopLevelDecl(M);
4310 }
4311
4312 EmitTopLevelDecl(I);
4313 }
4314}
4315
4316/// EmitTopLevelDecl - Emit code for a single top level declaration.
4317void CodeGenModule::EmitTopLevelDecl(Decl *D) {
4318 // Ignore dependent declarations.
4319 if (D->isTemplated())
4320 return;
4321
4322 switch (D->getKind()) {
4323 case Decl::CXXConversion:
4324 case Decl::CXXMethod:
4325 case Decl::Function:
4326 EmitGlobal(cast<FunctionDecl>(D));
4327 // Always provide some coverage mapping
4328 // even for the functions that aren't emitted.
4329 AddDeferredUnusedCoverageMapping(D);
4330 break;
4331
4332 case Decl::CXXDeductionGuide:
4333 // Function-like, but does not result in code emission.
4334 break;
4335
4336 case Decl::Var:
4337 case Decl::Decomposition:
4338 case Decl::VarTemplateSpecialization:
4339 EmitGlobal(cast<VarDecl>(D));
4340 if (auto *DD = dyn_cast<DecompositionDecl>(D))
4341 for (auto *B : DD->bindings())
4342 if (auto *HD = B->getHoldingVar())
4343 EmitGlobal(HD);
4344 break;
4345
4346 // Indirect fields from global anonymous structs and unions can be
4347 // ignored; only the actual variable requires IR gen support.
4348 case Decl::IndirectField:
4349 break;
4350
4351 // C++ Decls
4352 case Decl::Namespace:
4353 EmitDeclContext(cast<NamespaceDecl>(D));
4354 break;
4355 case Decl::ClassTemplateSpecialization: {
4356 const auto *Spec = cast<ClassTemplateSpecializationDecl>(D);
4357 if (DebugInfo &&
4358 Spec->getSpecializationKind() == TSK_ExplicitInstantiationDefinition &&
4359 Spec->hasDefinition())
4360 DebugInfo->completeTemplateDefinition(*Spec);
4361 } LLVM_FALLTHROUGH[[clang::fallthrough]];
4362 case Decl::CXXRecord:
4363 if (DebugInfo) {
4364 if (auto *ES = D->getASTContext().getExternalSource())
4365 if (ES->hasExternalDefinitions(D) == ExternalASTSource::EK_Never)
4366 DebugInfo->completeUnusedClass(cast<CXXRecordDecl>(*D));
4367 }
4368 // Emit any static data members, they may be definitions.
4369 for (auto *I : cast<CXXRecordDecl>(D)->decls())
4370 if (isa<VarDecl>(I) || isa<CXXRecordDecl>(I))
4371 EmitTopLevelDecl(I);
4372 break;
4373 // No code generation needed.
4374 case Decl::UsingShadow:
4375 case Decl::ClassTemplate:
4376 case Decl::VarTemplate:
4377 case Decl::VarTemplatePartialSpecialization:
4378 case Decl::FunctionTemplate:
4379 case Decl::TypeAliasTemplate:
4380 case Decl::Block:
4381 case Decl::Empty:
4382 break;
4383 case Decl::Using: // using X; [C++]
4384 if (CGDebugInfo *DI = getModuleDebugInfo())
4385 DI->EmitUsingDecl(cast<UsingDecl>(*D));
4386 return;
4387 case Decl::NamespaceAlias:
4388 if (CGDebugInfo *DI = getModuleDebugInfo())
4389 DI->EmitNamespaceAlias(cast<NamespaceAliasDecl>(*D));
4390 return;
4391 case Decl::UsingDirective: // using namespace X; [C++]
4392 if (CGDebugInfo *DI = getModuleDebugInfo())
4393 DI->EmitUsingDirective(cast<UsingDirectiveDecl>(*D));
4394 return;
4395 case Decl::CXXConstructor:
4396 getCXXABI().EmitCXXConstructors(cast<CXXConstructorDecl>(D));
4397 break;
4398 case Decl::CXXDestructor:
4399 getCXXABI().EmitCXXDestructors(cast<CXXDestructorDecl>(D));
4400 break;
4401
4402 case Decl::StaticAssert:
4403 // Nothing to do.
4404 break;
4405
4406 // Objective-C Decls
4407
4408 // Forward declarations, no (immediate) code generation.
4409 case Decl::ObjCInterface:
4410 case Decl::ObjCCategory:
4411 break;
4412
4413 case Decl::ObjCProtocol: {
4414 auto *Proto = cast<ObjCProtocolDecl>(D);
4415 if (Proto->isThisDeclarationADefinition())
4416 ObjCRuntime->GenerateProtocol(Proto);
4417 break;
4418 }
4419
4420 case Decl::ObjCCategoryImpl:
4421 // Categories have properties but don't support synthesize so we
4422 // can ignore them here.
4423 ObjCRuntime->GenerateCategory(cast<ObjCCategoryImplDecl>(D));
4424 break;
4425
4426 case Decl::ObjCImplementation: {
4427 auto *OMD = cast<ObjCImplementationDecl>(D);
4428 EmitObjCPropertyImplementations(OMD);
4429 EmitObjCIvarInitializations(OMD);
4430 ObjCRuntime->GenerateClass(OMD);
4431 // Emit global variable debug information.
4432 if (CGDebugInfo *DI = getModuleDebugInfo())
4433 if (getCodeGenOpts().getDebugInfo() >= codegenoptions::LimitedDebugInfo)
4434 DI->getOrCreateInterfaceType(getContext().getObjCInterfaceType(
4435 OMD->getClassInterface()), OMD->getLocation());
4436 break;
4437 }
4438 case Decl::ObjCMethod: {
4439 auto *OMD = cast<ObjCMethodDecl>(D);
4440 // If this is not a prototype, emit the body.
4441 if (OMD->getBody())
4442 CodeGenFunction(*this).GenerateObjCMethod(OMD);
4443 break;
4444 }
4445 case Decl::ObjCCompatibleAlias:
4446 ObjCRuntime->RegisterAlias(cast<ObjCCompatibleAliasDecl>(D));
4447 break;
4448
4449 case Decl::PragmaComment: {
4450 const auto *PCD = cast<PragmaCommentDecl>(D);
4451 switch (PCD->getCommentKind()) {
4452 case PCK_Unknown:
4453 llvm_unreachable("unexpected pragma comment kind")::llvm::llvm_unreachable_internal("unexpected pragma comment kind"
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 4453)
;
4454 case PCK_Linker:
4455 AppendLinkerOptions(PCD->getArg());
4456 break;
4457 case PCK_Lib:
4458 if (getTarget().getTriple().isOSBinFormatELF() &&
4459 !getTarget().getTriple().isPS4())
4460 AddELFLibDirective(PCD->getArg());
4461 else
4462 AddDependentLib(PCD->getArg());
4463 break;
4464 case PCK_Compiler:
4465 case PCK_ExeStr:
4466 case PCK_User:
4467 break; // We ignore all of these.
4468 }
4469 break;
4470 }
4471
4472 case Decl::PragmaDetectMismatch: {
4473 const auto *PDMD = cast<PragmaDetectMismatchDecl>(D);
4474 AddDetectMismatch(PDMD->getName(), PDMD->getValue());
4475 break;
4476 }
4477
4478 case Decl::LinkageSpec:
4479 EmitLinkageSpec(cast<LinkageSpecDecl>(D));
4480 break;
4481
4482 case Decl::FileScopeAsm: {
4483 // File-scope asm is ignored during device-side CUDA compilation.
4484 if (LangOpts.CUDA && LangOpts.CUDAIsDevice)
4485 break;
4486 // File-scope asm is ignored during device-side OpenMP compilation.
4487 if (LangOpts.OpenMPIsDevice)
4488 break;
4489 auto *AD = cast<FileScopeAsmDecl>(D);
4490 getModule().appendModuleInlineAsm(AD->getAsmString()->getString());
4491 break;
4492 }
4493
4494 case Decl::Import: {
4495 auto *Import = cast<ImportDecl>(D);
4496
4497 // If we've already imported this module, we're done.
4498 if (!ImportedModules.insert(Import->getImportedModule()))
4499 break;
4500
4501 // Emit debug information for direct imports.
4502 if (!Import->getImportedOwningModule()) {
4503 if (CGDebugInfo *DI = getModuleDebugInfo())
4504 DI->EmitImportDecl(*Import);
4505 }
4506
4507 // Find all of the submodules and emit the module initializers.
4508 llvm::SmallPtrSet<clang::Module *, 16> Visited;
4509 SmallVector<clang::Module *, 16> Stack;
4510 Visited.insert(Import->getImportedModule());
4511 Stack.push_back(Import->getImportedModule());
4512
4513 while (!Stack.empty()) {
4514 clang::Module *Mod = Stack.pop_back_val();
4515 if (!EmittedModuleInitializers.insert(Mod).second)
4516 continue;
4517
4518 for (auto *D : Context.getModuleInitializers(Mod))
4519 EmitTopLevelDecl(D);
4520
4521 // Visit the submodules of this module.
4522 for (clang::Module::submodule_iterator Sub = Mod->submodule_begin(),
4523 SubEnd = Mod->submodule_end();
4524 Sub != SubEnd; ++Sub) {
4525 // Skip explicit children; they need to be explicitly imported to emit
4526 // the initializers.
4527 if ((*Sub)->IsExplicit)
4528 continue;
4529
4530 if (Visited.insert(*Sub).second)
4531 Stack.push_back(*Sub);
4532 }
4533 }
4534 break;
4535 }
4536
4537 case Decl::Export:
4538 EmitDeclContext(cast<ExportDecl>(D));
4539 break;
4540
4541 case Decl::OMPThreadPrivate:
4542 EmitOMPThreadPrivateDecl(cast<OMPThreadPrivateDecl>(D));
4543 break;
4544
4545 case Decl::OMPDeclareReduction:
4546 EmitOMPDeclareReduction(cast<OMPDeclareReductionDecl>(D));
4547 break;
4548
4549 default:
4550 // Make sure we handled everything we should, every other kind is a
4551 // non-top-level decl. FIXME: Would be nice to have an isTopLevelDeclKind
4552 // function. Need to recode Decl::Kind to do that easily.
4553 assert(isa<TypeDecl>(D) && "Unsupported decl kind")(static_cast <bool> (isa<TypeDecl>(D) && "Unsupported decl kind"
) ? void (0) : __assert_fail ("isa<TypeDecl>(D) && \"Unsupported decl kind\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 4553, __extension__ __PRETTY_FUNCTION__))
;
4554 break;
4555 }
4556}
4557
4558void CodeGenModule::AddDeferredUnusedCoverageMapping(Decl *D) {
4559 // Do we need to generate coverage mapping?
4560 if (!CodeGenOpts.CoverageMapping)
4561 return;
4562 switch (D->getKind()) {
4563 case Decl::CXXConversion:
4564 case Decl::CXXMethod:
4565 case Decl::Function:
4566 case Decl::ObjCMethod:
4567 case Decl::CXXConstructor:
4568 case Decl::CXXDestructor: {
4569 if (!cast<FunctionDecl>(D)->doesThisDeclarationHaveABody())
4570 return;
4571 SourceManager &SM = getContext().getSourceManager();
4572 if (LimitedCoverage && SM.getMainFileID() != SM.getFileID(D->getLocStart()))
4573 return;
4574 auto I = DeferredEmptyCoverageMappingDecls.find(D);
4575 if (I == DeferredEmptyCoverageMappingDecls.end())
4576 DeferredEmptyCoverageMappingDecls[D] = true;
4577 break;
4578 }
4579 default:
4580 break;
4581 };
4582}
4583
4584void CodeGenModule::ClearUnusedCoverageMapping(const Decl *D) {
4585 // Do we need to generate coverage mapping?
4586 if (!CodeGenOpts.CoverageMapping)
4587 return;
4588 if (const auto *Fn = dyn_cast<FunctionDecl>(D)) {
4589 if (Fn->isTemplateInstantiation())
4590 ClearUnusedCoverageMapping(Fn->getTemplateInstantiationPattern());
4591 }
4592 auto I = DeferredEmptyCoverageMappingDecls.find(D);
4593 if (I == DeferredEmptyCoverageMappingDecls.end())
4594 DeferredEmptyCoverageMappingDecls[D] = false;
4595 else
4596 I->second = false;
4597}
4598
4599void CodeGenModule::EmitDeferredUnusedCoverageMappings() {
4600 // We call takeVector() here to avoid use-after-free.
4601 // FIXME: DeferredEmptyCoverageMappingDecls is getting mutated because
4602 // we deserialize function bodies to emit coverage info for them, and that
4603 // deserializes more declarations. How should we handle that case?
4604 for (const auto &Entry : DeferredEmptyCoverageMappingDecls.takeVector()) {
4605 if (!Entry.second)
4606 continue;
4607 const Decl *D = Entry.first;
4608 switch (D->getKind()) {
4609 case Decl::CXXConversion:
4610 case Decl::CXXMethod:
4611 case Decl::Function:
4612 case Decl::ObjCMethod: {
4613 CodeGenPGO PGO(*this);
4614 GlobalDecl GD(cast<FunctionDecl>(D));
4615 PGO.emitEmptyCounterMapping(D, getMangledName(GD),
4616 getFunctionLinkage(GD));
4617 break;
4618 }
4619 case Decl::CXXConstructor: {
4620 CodeGenPGO PGO(*this);
4621 GlobalDecl GD(cast<CXXConstructorDecl>(D), Ctor_Base);
4622 PGO.emitEmptyCounterMapping(D, getMangledName(GD),
4623 getFunctionLinkage(GD));
4624 break;
4625 }
4626 case Decl::CXXDestructor: {
4627 CodeGenPGO PGO(*this);
4628 GlobalDecl GD(cast<CXXDestructorDecl>(D), Dtor_Base);
4629 PGO.emitEmptyCounterMapping(D, getMangledName(GD),
4630 getFunctionLinkage(GD));
4631 break;
4632 }
4633 default:
4634 break;
4635 };
4636 }
4637}
4638
4639/// Turns the given pointer into a constant.
4640static llvm::Constant *GetPointerConstant(llvm::LLVMContext &Context,
4641 const void *Ptr) {
4642 uintptr_t PtrInt = reinterpret_cast<uintptr_t>(Ptr);
4643 llvm::Type *i64 = llvm::Type::getInt64Ty(Context);
4644 return llvm::ConstantInt::get(i64, PtrInt);
4645}
4646
4647static void EmitGlobalDeclMetadata(CodeGenModule &CGM,
4648 llvm::NamedMDNode *&GlobalMetadata,
4649 GlobalDecl D,
4650 llvm::GlobalValue *Addr) {
4651 if (!GlobalMetadata)
4652 GlobalMetadata =
4653 CGM.getModule().getOrInsertNamedMetadata("clang.global.decl.ptrs");
4654
4655 // TODO: should we report variant information for ctors/dtors?
4656 llvm::Metadata *Ops[] = {llvm::ConstantAsMetadata::get(Addr),
4657 llvm::ConstantAsMetadata::get(GetPointerConstant(
4658 CGM.getLLVMContext(), D.getDecl()))};
4659 GlobalMetadata->addOperand(llvm::MDNode::get(CGM.getLLVMContext(), Ops));
4660}
4661
4662/// For each function which is declared within an extern "C" region and marked
4663/// as 'used', but has internal linkage, create an alias from the unmangled
4664/// name to the mangled name if possible. People expect to be able to refer
4665/// to such functions with an unmangled name from inline assembly within the
4666/// same translation unit.
4667void CodeGenModule::EmitStaticExternCAliases() {
4668 // Don't do anything if we're generating CUDA device code -- the NVPTX
4669 // assembly target doesn't support aliases.
4670 if (Context.getTargetInfo().getTriple().isNVPTX())
4671 return;
4672 for (auto &I : StaticExternCValues) {
4673 IdentifierInfo *Name = I.first;
4674 llvm::GlobalValue *Val = I.second;
4675 if (Val && !getModule().getNamedValue(Name->getName()))
4676 addUsedGlobal(llvm::GlobalAlias::create(Name->getName(), Val));
4677 }
4678}
4679
4680bool CodeGenModule::lookupRepresentativeDecl(StringRef MangledName,
4681 GlobalDecl &Result) const {
4682 auto Res = Manglings.find(MangledName);
4683 if (Res == Manglings.end())
4684 return false;
4685 Result = Res->getValue();
4686 return true;
4687}
4688
4689/// Emits metadata nodes associating all the global values in the
4690/// current module with the Decls they came from. This is useful for
4691/// projects using IR gen as a subroutine.
4692///
4693/// Since there's currently no way to associate an MDNode directly
4694/// with an llvm::GlobalValue, we create a global named metadata
4695/// with the name 'clang.global.decl.ptrs'.
4696void CodeGenModule::EmitDeclMetadata() {
4697 llvm::NamedMDNode *GlobalMetadata = nullptr;
4698
4699 for (auto &I : MangledDeclNames) {
4700 llvm::GlobalValue *Addr = getModule().getNamedValue(I.second);
4701 // Some mangled names don't necessarily have an associated GlobalValue
4702 // in this module, e.g. if we mangled it for DebugInfo.
4703 if (Addr)
4704 EmitGlobalDeclMetadata(*this, GlobalMetadata, I.first, Addr);
4705 }
4706}
4707
4708/// Emits metadata nodes for all the local variables in the current
4709/// function.
4710void CodeGenFunction::EmitDeclMetadata() {
4711 if (LocalDeclMap.empty()) return;
4712
4713 llvm::LLVMContext &Context = getLLVMContext();
4714
4715 // Find the unique metadata ID for this name.
4716 unsigned DeclPtrKind = Context.getMDKindID("clang.decl.ptr");
4717
4718 llvm::NamedMDNode *GlobalMetadata = nullptr;
4719
4720 for (auto &I : LocalDeclMap) {
4721 const Decl *D = I.first;
4722 llvm::Value *Addr = I.second.getPointer();
4723 if (auto *Alloca = dyn_cast<llvm::AllocaInst>(Addr)) {
4724 llvm::Value *DAddr = GetPointerConstant(getLLVMContext(), D);
4725 Alloca->setMetadata(
4726 DeclPtrKind, llvm::MDNode::get(
4727 Context, llvm::ValueAsMetadata::getConstant(DAddr)));
4728 } else if (auto *GV = dyn_cast<llvm::GlobalValue>(Addr)) {
4729 GlobalDecl GD = GlobalDecl(cast<VarDecl>(D));
4730 EmitGlobalDeclMetadata(CGM, GlobalMetadata, GD, GV);
4731 }
4732 }
4733}
4734
4735void CodeGenModule::EmitVersionIdentMetadata() {
4736 llvm::NamedMDNode *IdentMetadata =
4737 TheModule.getOrInsertNamedMetadata("llvm.ident");
4738 std::string Version = getClangFullVersion();
4739 llvm::LLVMContext &Ctx = TheModule.getContext();
4740
4741 llvm::Metadata *IdentNode[] = {llvm::MDString::get(Ctx, Version)};
4742 IdentMetadata->addOperand(llvm::MDNode::get(Ctx, IdentNode));
4743}
4744
4745void CodeGenModule::EmitTargetMetadata() {
4746 // Warning, new MangledDeclNames may be appended within this loop.
4747 // We rely on MapVector insertions adding new elements to the end
4748 // of the container.
4749 // FIXME: Move this loop into the one target that needs it, and only
4750 // loop over those declarations for which we couldn't emit the target
4751 // metadata when we emitted the declaration.
4752 for (unsigned I = 0; I != MangledDeclNames.size(); ++I) {
4753 auto Val = *(MangledDeclNames.begin() + I);
4754 const Decl *D = Val.first.getDecl()->getMostRecentDecl();
4755 llvm::GlobalValue *GV = GetGlobalValue(Val.second);
4756 getTargetCodeGenInfo().emitTargetMD(D, GV, *this);
4757 }
4758}
4759
4760void CodeGenModule::EmitCoverageFile() {
4761 if (getCodeGenOpts().CoverageDataFile.empty() &&
4762 getCodeGenOpts().CoverageNotesFile.empty())
4763 return;
4764
4765 llvm::NamedMDNode *CUNode = TheModule.getNamedMetadata("llvm.dbg.cu");
4766 if (!CUNode)
4767 return;
4768
4769 llvm::NamedMDNode *GCov = TheModule.getOrInsertNamedMetadata("llvm.gcov");
4770 llvm::LLVMContext &Ctx = TheModule.getContext();
4771 auto *CoverageDataFile =
4772 llvm::MDString::get(Ctx, getCodeGenOpts().CoverageDataFile);
4773 auto *CoverageNotesFile =
4774 llvm::MDString::get(Ctx, getCodeGenOpts().CoverageNotesFile);
4775 for (int i = 0, e = CUNode->getNumOperands(); i != e; ++i) {
4776 llvm::MDNode *CU = CUNode->getOperand(i);
4777 llvm::Metadata *Elts[] = {CoverageNotesFile, CoverageDataFile, CU};
4778 GCov->addOperand(llvm::MDNode::get(Ctx, Elts));
4779 }
4780}
4781
4782llvm::Constant *CodeGenModule::EmitUuidofInitializer(StringRef Uuid) {
4783 // Sema has checked that all uuid strings are of the form
4784 // "12345678-1234-1234-1234-1234567890ab".
4785 assert(Uuid.size() == 36)(static_cast <bool> (Uuid.size() == 36) ? void (0) : __assert_fail
("Uuid.size() == 36", "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 4785, __extension__ __PRETTY_FUNCTION__))
;
4786 for (unsigned i = 0; i < 36; ++i) {
4787 if (i == 8 || i == 13 || i == 18 || i == 23) assert(Uuid[i] == '-')(static_cast <bool> (Uuid[i] == '-') ? void (0) : __assert_fail
("Uuid[i] == '-'", "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 4787, __extension__ __PRETTY_FUNCTION__))
;
4788 else assert(isHexDigit(Uuid[i]))(static_cast <bool> (isHexDigit(Uuid[i])) ? void (0) : __assert_fail
("isHexDigit(Uuid[i])", "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 4788, __extension__ __PRETTY_FUNCTION__))
;
4789 }
4790
4791 // The starts of all bytes of Field3 in Uuid. Field 3 is "1234-1234567890ab".
4792 const unsigned Field3ValueOffsets[8] = { 19, 21, 24, 26, 28, 30, 32, 34 };
4793
4794 llvm::Constant *Field3[8];
4795 for (unsigned Idx = 0; Idx < 8; ++Idx)
4796 Field3[Idx] = llvm::ConstantInt::get(
4797 Int8Ty, Uuid.substr(Field3ValueOffsets[Idx], 2), 16);
4798
4799 llvm::Constant *Fields[4] = {
4800 llvm::ConstantInt::get(Int32Ty, Uuid.substr(0, 8), 16),
4801 llvm::ConstantInt::get(Int16Ty, Uuid.substr(9, 4), 16),
4802 llvm::ConstantInt::get(Int16Ty, Uuid.substr(14, 4), 16),
4803 llvm::ConstantArray::get(llvm::ArrayType::get(Int8Ty, 8), Field3)
4804 };
4805
4806 return llvm::ConstantStruct::getAnon(Fields);
4807}
4808
4809llvm::Constant *CodeGenModule::GetAddrOfRTTIDescriptor(QualType Ty,
4810 bool ForEH) {
4811 // Return a bogus pointer if RTTI is disabled, unless it's for EH.
4812 // FIXME: should we even be calling this method if RTTI is disabled
4813 // and it's not for EH?
4814 if (!ForEH && !getLangOpts().RTTI)
4815 return llvm::Constant::getNullValue(Int8PtrTy);
4816
4817 if (ForEH && Ty->isObjCObjectPointerType() &&
4818 LangOpts.ObjCRuntime.isGNUFamily())
4819 return ObjCRuntime->GetEHType(Ty);
4820
4821 return getCXXABI().getAddrOfRTTIDescriptor(Ty);
4822}
4823
4824void CodeGenModule::EmitOMPThreadPrivateDecl(const OMPThreadPrivateDecl *D) {
4825 // Do not emit threadprivates in simd-only mode.
4826 if (LangOpts.OpenMP && LangOpts.OpenMPSimd)
4827 return;
4828 for (auto RefExpr : D->varlists()) {
4829 auto *VD = cast<VarDecl>(cast<DeclRefExpr>(RefExpr)->getDecl());
4830 bool PerformInit =
4831 VD->getAnyInitializer() &&
4832 !VD->getAnyInitializer()->isConstantInitializer(getContext(),
4833 /*ForRef=*/false);
4834
4835 Address Addr(GetAddrOfGlobalVar(VD), getContext().getDeclAlign(VD));
4836 if (auto InitFunction = getOpenMPRuntime().emitThreadPrivateVarDefinition(
4837 VD, Addr, RefExpr->getLocStart(), PerformInit))
4838 CXXGlobalInits.push_back(InitFunction);
4839 }
4840}
4841
4842llvm::Metadata *CodeGenModule::CreateMetadataIdentifierForType(QualType T) {
4843 llvm::Metadata *&InternalId = MetadataIdMap[T.getCanonicalType()];
4844 if (InternalId)
4845 return InternalId;
4846
4847 if (isExternallyVisible(T->getLinkage())) {
4848 std::string OutName;
4849 llvm::raw_string_ostream Out(OutName);
4850 getCXXABI().getMangleContext().mangleTypeName(T, Out);
4851
4852 InternalId = llvm::MDString::get(getLLVMContext(), Out.str());
4853 } else {
4854 InternalId = llvm::MDNode::getDistinct(getLLVMContext(),
4855 llvm::ArrayRef<llvm::Metadata *>());
4856 }
4857
4858 return InternalId;
4859}
4860
4861// Generalize pointer types to a void pointer with the qualifiers of the
4862// originally pointed-to type, e.g. 'const char *' and 'char * const *'
4863// generalize to 'const void *' while 'char *' and 'const char **' generalize to
4864// 'void *'.
4865static QualType GeneralizeType(ASTContext &Ctx, QualType Ty) {
4866 if (!Ty->isPointerType())
4867 return Ty;
4868
4869 return Ctx.getPointerType(
4870 QualType(Ctx.VoidTy).withCVRQualifiers(
4871 Ty->getPointeeType().getCVRQualifiers()));
4872}
4873
4874// Apply type generalization to a FunctionType's return and argument types
4875static QualType GeneralizeFunctionType(ASTContext &Ctx, QualType Ty) {
4876 if (auto *FnType = Ty->getAs<FunctionProtoType>()) {
4877 SmallVector<QualType, 8> GeneralizedParams;
4878 for (auto &Param : FnType->param_types())
4879 GeneralizedParams.push_back(GeneralizeType(Ctx, Param));
4880
4881 return Ctx.getFunctionType(
4882 GeneralizeType(Ctx, FnType->getReturnType()),
4883 GeneralizedParams, FnType->getExtProtoInfo());
4884 }
4885
4886 if (auto *FnType = Ty->getAs<FunctionNoProtoType>())
4887 return Ctx.getFunctionNoProtoType(
4888 GeneralizeType(Ctx, FnType->getReturnType()));
4889
4890 llvm_unreachable("Encountered unknown FunctionType")::llvm::llvm_unreachable_internal("Encountered unknown FunctionType"
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/lib/CodeGen/CodeGenModule.cpp"
, 4890)
;
4891}
4892
4893llvm::Metadata *CodeGenModule::CreateMetadataIdentifierGeneralized(QualType T) {
4894 T = GeneralizeFunctionType(getContext(), T);
4895
4896 llvm::Metadata *&InternalId = GeneralizedMetadataIdMap[T.getCanonicalType()];
4897 if (InternalId)
4898 return InternalId;
4899
4900 if (isExternallyVisible(T->getLinkage())) {
4901 std::string OutName;
4902 llvm::raw_string_ostream Out(OutName);
4903 getCXXABI().getMangleContext().mangleTypeName(T, Out);
4904 Out << ".generalized";
4905
4906 InternalId = llvm::MDString::get(getLLVMContext(), Out.str());
4907 } else {
4908 InternalId = llvm::MDNode::getDistinct(getLLVMContext(),
4909 llvm::ArrayRef<llvm::Metadata *>());
4910 }
4911
4912 return InternalId;
4913}
4914
4915/// Returns whether this module needs the "all-vtables" type identifier.
4916bool CodeGenModule::NeedAllVtablesTypeId() const {
4917 // Returns true if at least one of vtable-based CFI checkers is enabled and
4918 // is not in the trapping mode.
4919 return ((LangOpts.Sanitize.has(SanitizerKind::CFIVCall) &&
4920 !CodeGenOpts.SanitizeTrap.has(SanitizerKind::CFIVCall)) ||
4921 (LangOpts.Sanitize.has(SanitizerKind::CFINVCall) &&
4922 !CodeGenOpts.SanitizeTrap.has(SanitizerKind::CFINVCall)) ||
4923 (LangOpts.Sanitize.has(SanitizerKind::CFIDerivedCast) &&
4924 !CodeGenOpts.SanitizeTrap.has(SanitizerKind::CFIDerivedCast)) ||
4925 (LangOpts.Sanitize.has(SanitizerKind::CFIUnrelatedCast) &&
4926 !CodeGenOpts.SanitizeTrap.has(SanitizerKind::CFIUnrelatedCast)));
4927}
4928
4929void CodeGenModule::AddVTableTypeMetadata(llvm::GlobalVariable *VTable,
4930 CharUnits Offset,
4931 const CXXRecordDecl *RD) {
4932 llvm::Metadata *MD =
4933 CreateMetadataIdentifierForType(QualType(RD->getTypeForDecl(), 0));
4934 VTable->addTypeMetadata(Offset.getQuantity(), MD);
4935
4936 if (CodeGenOpts.SanitizeCfiCrossDso)
4937 if (auto CrossDsoTypeId = CreateCrossDsoCfiTypeId(MD))
4938 VTable->addTypeMetadata(Offset.getQuantity(),
4939 llvm::ConstantAsMetadata::get(CrossDsoTypeId));
4940
4941 if (NeedAllVtablesTypeId()) {
4942 llvm::Metadata *MD = llvm::MDString::get(getLLVMContext(), "all-vtables");
4943 VTable->addTypeMetadata(Offset.getQuantity(), MD);
4944 }
4945}
4946
4947// Fills in the supplied string map with the set of target features for the
4948// passed in function.
4949void CodeGenModule::getFunctionFeatureMap(llvm::StringMap<bool> &FeatureMap,
4950 const FunctionDecl *FD) {
4951 StringRef TargetCPU = Target.getTargetOpts().CPU;
4952 if (const auto *TD = FD->getAttr<TargetAttr>()) {
4953 // If we have a TargetAttr build up the feature map based on that.
4954 TargetAttr::ParsedTargetAttr ParsedAttr = TD->parse();
4955
4956 ParsedAttr.Features.erase(
4957 llvm::remove_if(ParsedAttr.Features,
4958 [&](const std::string &Feat) {
4959 return !Target.isValidFeatureName(
4960 StringRef{Feat}.substr(1));
4961 }),
4962 ParsedAttr.Features.end());
4963
4964 // Make a copy of the features as passed on the command line into the
4965 // beginning of the additional features from the function to override.
4966 ParsedAttr.Features.insert(ParsedAttr.Features.begin(),
4967 Target.getTargetOpts().FeaturesAsWritten.begin(),
4968 Target.getTargetOpts().FeaturesAsWritten.end());
4969
4970 if (ParsedAttr.Architecture != "" &&
4971 Target.isValidCPUName(ParsedAttr.Architecture))
4972 TargetCPU = ParsedAttr.Architecture;
4973
4974 // Now populate the feature map, first with the TargetCPU which is either
4975 // the default or a new one from the target attribute string. Then we'll use
4976 // the passed in features (FeaturesAsWritten) along with the new ones from
4977 // the attribute.
4978 Target.initFeatureMap(FeatureMap, getDiags(), TargetCPU,
4979 ParsedAttr.Features);
4980 } else {
4981 Target.initFeatureMap(FeatureMap, getDiags(), TargetCPU,
4982 Target.getTargetOpts().Features);
4983 }
4984}
4985
4986llvm::SanitizerStatReport &CodeGenModule::getSanStats() {
4987 if (!SanStats)
4988 SanStats = llvm::make_unique<llvm::SanitizerStatReport>(&getModule());
4989
4990 return *SanStats;
4991}
4992llvm::Value *
4993CodeGenModule::createOpenCLIntToSamplerConversion(const Expr *E,
4994 CodeGenFunction &CGF) {
4995 llvm::Constant *C = ConstantEmitter(CGF).emitAbstract(E, E->getType());
4996 auto SamplerT = getOpenCLRuntime().getSamplerType(E->getType().getTypePtr());
4997 auto FTy = llvm::FunctionType::get(SamplerT, {C->getType()}, false);
4998 return CGF.Builder.CreateCall(CreateRuntimeFunction(FTy,
4999 "__translate_sampler_initializer"),
5000 {C});
5001}

/build/llvm-toolchain-snapshot-7~svn326246/include/llvm/Support/Casting.h

1//===- llvm/Support/Casting.h - Allow flexible, checked, casts --*- C++ -*-===//
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 file defines the isa<X>(), cast<X>(), dyn_cast<X>(), cast_or_null<X>(),
11// and dyn_cast_or_null<X>() templates.
12//
13//===----------------------------------------------------------------------===//
14
15#ifndef LLVM_SUPPORT_CASTING_H
16#define LLVM_SUPPORT_CASTING_H
17
18#include "llvm/Support/Compiler.h"
19#include "llvm/Support/type_traits.h"
20#include <cassert>
21#include <memory>
22#include <type_traits>
23
24namespace llvm {
25
26//===----------------------------------------------------------------------===//
27// isa<x> Support Templates
28//===----------------------------------------------------------------------===//
29
30// Define a template that can be specialized by smart pointers to reflect the
31// fact that they are automatically dereferenced, and are not involved with the
32// template selection process... the default implementation is a noop.
33//
34template<typename From> struct simplify_type {
35 using SimpleType = From; // The real type this represents...
36
37 // An accessor to get the real value...
38 static SimpleType &getSimplifiedValue(From &Val) { return Val; }
39};
40
41template<typename From> struct simplify_type<const From> {
42 using NonConstSimpleType = typename simplify_type<From>::SimpleType;
43 using SimpleType =
44 typename add_const_past_pointer<NonConstSimpleType>::type;
45 using RetType =
46 typename add_lvalue_reference_if_not_pointer<SimpleType>::type;
47
48 static RetType getSimplifiedValue(const From& Val) {
49 return simplify_type<From>::getSimplifiedValue(const_cast<From&>(Val));
5
Calling 'simplify_type::getSimplifiedValue'
6
Returning from 'simplify_type::getSimplifiedValue'
50 }
51};
52
53// The core of the implementation of isa<X> is here; To and From should be
54// the names of classes. This template can be specialized to customize the
55// implementation of isa<> without rewriting it from scratch.
56template <typename To, typename From, typename Enabler = void>
57struct isa_impl {
58 static inline bool doit(const From &Val) {
59 return To::classof(&Val);
12
Calling 'VarDecl::classof'
19
Returning from 'VarDecl::classof'
60 }
61};
62
63/// \brief Always allow upcasts, and perform no dynamic check for them.
64template <typename To, typename From>
65struct isa_impl<
66 To, From, typename std::enable_if<std::is_base_of<To, From>::value>::type> {
67 static inline bool doit(const From &) { return true; }
68};
69
70template <typename To, typename From> struct isa_impl_cl {
71 static inline bool doit(const From &Val) {
72 return isa_impl<To, From>::doit(Val);
73 }
74};
75
76template <typename To, typename From> struct isa_impl_cl<To, const From> {
77 static inline bool doit(const From &Val) {
78 return isa_impl<To, From>::doit(Val);
79 }
80};
81
82template <typename To, typename From>
83struct isa_impl_cl<To, const std::unique_ptr<From>> {
84 static inline bool doit(const std::unique_ptr<From> &Val) {
85 assert(Val && "isa<> used on a null pointer")(static_cast <bool> (Val && "isa<> used on a null pointer"
) ? void (0) : __assert_fail ("Val && \"isa<> used on a null pointer\""
, "/build/llvm-toolchain-snapshot-7~svn326246/include/llvm/Support/Casting.h"
, 85, __extension__ __PRETTY_FUNCTION__))
;
86 return isa_impl_cl<To, From>::doit(*Val);
87 }
88};
89
90template <typename To, typename From> struct isa_impl_cl<To, From*> {
91 static inline bool doit(const From *Val) {
92 assert(Val && "isa<> used on a null pointer")(static_cast <bool> (Val && "isa<> used on a null pointer"
) ? void (0) : __assert_fail ("Val && \"isa<> used on a null pointer\""
, "/build/llvm-toolchain-snapshot-7~svn326246/include/llvm/Support/Casting.h"
, 92, __extension__ __PRETTY_FUNCTION__))
;
93 return isa_impl<To, From>::doit(*Val);
94 }
95};
96
97template <typename To, typename From> struct isa_impl_cl<To, From*const> {
98 static inline bool doit(const From *Val) {
99 assert(Val && "isa<> used on a null pointer")(static_cast <bool> (Val && "isa<> used on a null pointer"
) ? void (0) : __assert_fail ("Val && \"isa<> used on a null pointer\""
, "/build/llvm-toolchain-snapshot-7~svn326246/include/llvm/Support/Casting.h"
, 99, __extension__ __PRETTY_FUNCTION__))
;
100 return isa_impl<To, From>::doit(*Val);
101 }
102};
103
104template <typename To, typename From> struct isa_impl_cl<To, const From*> {
105 static inline bool doit(const From *Val) {
106 assert(Val && "isa<> used on a null pointer")(static_cast <bool> (Val && "isa<> used on a null pointer"
) ? void (0) : __assert_fail ("Val && \"isa<> used on a null pointer\""
, "/build/llvm-toolchain-snapshot-7~svn326246/include/llvm/Support/Casting.h"
, 106, __extension__ __PRETTY_FUNCTION__))
;
10
Within the expansion of the macro 'assert':
a
Assuming 'Val' is non-null
107 return isa_impl<To, From>::doit(*Val);
11
Calling 'isa_impl::doit'
20
Returning from 'isa_impl::doit'
108 }
109};
110
111template <typename To, typename From> struct isa_impl_cl<To, const From*const> {
112 static inline bool doit(const From *Val) {
113 assert(Val && "isa<> used on a null pointer")(static_cast <bool> (Val && "isa<> used on a null pointer"
) ? void (0) : __assert_fail ("Val && \"isa<> used on a null pointer\""
, "/build/llvm-toolchain-snapshot-7~svn326246/include/llvm/Support/Casting.h"
, 113, __extension__ __PRETTY_FUNCTION__))
;
114 return isa_impl<To, From>::doit(*Val);
115 }
116};
117
118template<typename To, typename From, typename SimpleFrom>
119struct isa_impl_wrap {
120 // When From != SimplifiedType, we can simplify the type some more by using
121 // the simplify_type template.
122 static bool doit(const From &Val) {
123 return isa_impl_wrap<To, SimpleFrom,
8
Calling 'isa_impl_wrap::doit'
22
Returning from 'isa_impl_wrap::doit'
124 typename simplify_type<SimpleFrom>::SimpleType>::doit(
125 simplify_type<const From>::getSimplifiedValue(Val));
4
Calling 'simplify_type::getSimplifiedValue'
7
Returning from 'simplify_type::getSimplifiedValue'
126 }
127};
128
129template<typename To, typename FromTy>
130struct isa_impl_wrap<To, FromTy, FromTy> {
131 // When From == SimpleType, we are as simple as we are going to get.
132 static bool doit(const FromTy &Val) {
133 return isa_impl_cl<To,FromTy>::doit(Val);
9
Calling 'isa_impl_cl::doit'
21
Returning from 'isa_impl_cl::doit'
134 }
135};
136
137// isa<X> - Return true if the parameter to the template is an instance of the
138// template type argument. Used like this:
139//
140// if (isa<Type>(myVal)) { ... }
141//
142template <class X, class Y> LLVM_NODISCARD[[clang::warn_unused_result]] inline bool isa(const Y &Val) {
143 return isa_impl_wrap<X, const Y,
3
Calling 'isa_impl_wrap::doit'
23
Returning from 'isa_impl_wrap::doit'
144 typename simplify_type<const Y>::SimpleType>::doit(Val);
145}
146
147//===----------------------------------------------------------------------===//
148// cast<x> Support Templates
149//===----------------------------------------------------------------------===//
150
151template<class To, class From> struct cast_retty;
152
153// Calculate what type the 'cast' function should return, based on a requested
154// type of To and a source type of From.
155template<class To, class From> struct cast_retty_impl {
156 using ret_type = To &; // Normal case, return Ty&
157};
158template<class To, class From> struct cast_retty_impl<To, const From> {
159 using ret_type = const To &; // Normal case, return Ty&
160};
161
162template<class To, class From> struct cast_retty_impl<To, From*> {
163 using ret_type = To *; // Pointer arg case, return Ty*
164};
165
166template<class To, class From> struct cast_retty_impl<To, const From*> {
167 using ret_type = const To *; // Constant pointer arg case, return const Ty*
168};
169
170template<class To, class From> struct cast_retty_impl<To, const From*const> {
171 using ret_type = const To *; // Constant pointer arg case, return const Ty*
172};
173
174template <class To, class From>
175struct cast_retty_impl<To, std::unique_ptr<From>> {
176private:
177 using PointerType = typename cast_retty_impl<To, From *>::ret_type;
178 using ResultType = typename std::remove_pointer<PointerType>::type;
179
180public:
181 using ret_type = std::unique_ptr<ResultType>;
182};
183
184template<class To, class From, class SimpleFrom>
185struct cast_retty_wrap {
186 // When the simplified type and the from type are not the same, use the type
187 // simplifier to reduce the type, then reuse cast_retty_impl to get the
188 // resultant type.
189 using ret_type = typename cast_retty<To, SimpleFrom>::ret_type;
190};
191
192template<class To, class FromTy>
193struct cast_retty_wrap<To, FromTy, FromTy> {
194 // When the simplified type is equal to the from type, use it directly.
195 using ret_type = typename cast_retty_impl<To,FromTy>::ret_type;
196};
197
198template<class To, class From>
199struct cast_retty {
200 using ret_type = typename cast_retty_wrap<
201 To, From, typename simplify_type<From>::SimpleType>::ret_type;
202};
203
204// Ensure the non-simple values are converted using the simplify_type template
205// that may be specialized by smart pointers...
206//
207template<class To, class From, class SimpleFrom> struct cast_convert_val {
208 // This is not a simple type, use the template to simplify it...
209 static typename cast_retty<To, From>::ret_type doit(From &Val) {
210 return cast_convert_val<To, SimpleFrom,
211 typename simplify_type<SimpleFrom>::SimpleType>::doit(
212 simplify_type<From>::getSimplifiedValue(Val));
213 }
214};
215
216template<class To, class FromTy> struct cast_convert_val<To,FromTy,FromTy> {
217 // This _is_ a simple type, just cast it.
218 static typename cast_retty<To, FromTy>::ret_type doit(const FromTy &Val) {
219 typename cast_retty<To, FromTy>::ret_type Res2
220 = (typename cast_retty<To, FromTy>::ret_type)const_cast<FromTy&>(Val);
221 return Res2;
222 }
223};
224
225template <class X> struct is_simple_type {
226 static const bool value =
227 std::is_same<X, typename simplify_type<X>::SimpleType>::value;
228};
229
230// cast<X> - Return the argument parameter cast to the specified type. This
231// casting operator asserts that the type is correct, so it does not return null
232// on failure. It does not allow a null argument (use cast_or_null for that).
233// It is typically used like this:
234//
235// cast<Instruction>(myVal)->getParent()
236//
237template <class X, class Y>
238inline typename std::enable_if<!is_simple_type<Y>::value,
239 typename cast_retty<X, const Y>::ret_type>::type
240cast(const Y &Val) {
241 assert(isa<X>(Val) && "cast<Ty>() argument of incompatible type!")(static_cast <bool> (isa<X>(Val) && "cast<Ty>() argument of incompatible type!"
) ? void (0) : __assert_fail ("isa<X>(Val) && \"cast<Ty>() argument of incompatible type!\""
, "/build/llvm-toolchain-snapshot-7~svn326246/include/llvm/Support/Casting.h"
, 241, __extension__ __PRETTY_FUNCTION__))
;
242 return cast_convert_val<
243 X, const Y, typename simplify_type<const Y>::SimpleType>::doit(Val);
244}
245
246template <class X, class Y>
247inline typename cast_retty<X, Y>::ret_type cast(Y &Val) {
248 assert(isa<X>(Val) && "cast<Ty>() argument of incompatible type!")(static_cast <bool> (isa<X>(Val) && "cast<Ty>() argument of incompatible type!"
) ? void (0) : __assert_fail ("isa<X>(Val) && \"cast<Ty>() argument of incompatible type!\""
, "/build/llvm-toolchain-snapshot-7~svn326246/include/llvm/Support/Casting.h"
, 248, __extension__ __PRETTY_FUNCTION__))
;
249 return cast_convert_val<X, Y,
250 typename simplify_type<Y>::SimpleType>::doit(Val);
251}
252
253template <class X, class Y>
254inline typename cast_retty<X, Y *>::ret_type cast(Y *Val) {
255 assert(isa<X>(Val) && "cast<Ty>() argument of incompatible type!")(static_cast <bool> (isa<X>(Val) && "cast<Ty>() argument of incompatible type!"
) ? void (0) : __assert_fail ("isa<X>(Val) && \"cast<Ty>() argument of incompatible type!\""
, "/build/llvm-toolchain-snapshot-7~svn326246/include/llvm/Support/Casting.h"
, 255, __extension__ __PRETTY_FUNCTION__))
;
2
Within the expansion of the macro 'assert':
a
Calling 'isa'
b
Returning from 'isa'
256 return cast_convert_val<X, Y*,
24
Calling 'cast_convert_val::doit'
25
Returning from 'cast_convert_val::doit'
257 typename simplify_type<Y*>::SimpleType>::doit(Val);
258}
259
260template <class X, class Y>
261inline typename cast_retty<X, std::unique_ptr<Y>>::ret_type
262cast(std::unique_ptr<Y> &&Val) {
263 assert(isa<X>(Val.get()) && "cast<Ty>() argument of incompatible type!")(static_cast <bool> (isa<X>(Val.get()) &&
"cast<Ty>() argument of incompatible type!") ? void (0
) : __assert_fail ("isa<X>(Val.get()) && \"cast<Ty>() argument of incompatible type!\""
, "/build/llvm-toolchain-snapshot-7~svn326246/include/llvm/Support/Casting.h"
, 263, __extension__ __PRETTY_FUNCTION__))
;
264 using ret_type = typename cast_retty<X, std::unique_ptr<Y>>::ret_type;
265 return ret_type(
266 cast_convert_val<X, Y *, typename simplify_type<Y *>::SimpleType>::doit(
267 Val.release()));
268}
269
270// cast_or_null<X> - Functionally identical to cast, except that a null value is
271// accepted.
272//
273template <class X, class Y>
274LLVM_NODISCARD[[clang::warn_unused_result]] inline
275 typename std::enable_if<!is_simple_type<Y>::value,
276 typename cast_retty<X, const Y>::ret_type>::type
277 cast_or_null(const Y &Val) {
278 if (!Val)
279 return nullptr;
280 assert(isa<X>(Val) && "cast_or_null<Ty>() argument of incompatible type!")(static_cast <bool> (isa<X>(Val) && "cast_or_null<Ty>() argument of incompatible type!"
) ? void (0) : __assert_fail ("isa<X>(Val) && \"cast_or_null<Ty>() argument of incompatible type!\""
, "/build/llvm-toolchain-snapshot-7~svn326246/include/llvm/Support/Casting.h"
, 280, __extension__ __PRETTY_FUNCTION__))
;
281 return cast<X>(Val);
282}
283
284template <class X, class Y>
285LLVM_NODISCARD[[clang::warn_unused_result]] inline
286 typename std::enable_if<!is_simple_type<Y>::value,
287 typename cast_retty<X, Y>::ret_type>::type
288 cast_or_null(Y &Val) {
289 if (!Val)
290 return nullptr;
291 assert(isa<X>(Val) && "cast_or_null<Ty>() argument of incompatible type!")(static_cast <bool> (isa<X>(Val) && "cast_or_null<Ty>() argument of incompatible type!"
) ? void (0) : __assert_fail ("isa<X>(Val) && \"cast_or_null<Ty>() argument of incompatible type!\""
, "/build/llvm-toolchain-snapshot-7~svn326246/include/llvm/Support/Casting.h"
, 291, __extension__ __PRETTY_FUNCTION__))
;
292 return cast<X>(Val);
293}
294
295template <class X, class Y>
296LLVM_NODISCARD[[clang::warn_unused_result]] inline typename cast_retty<X, Y *>::ret_type
297cast_or_null(Y *Val) {
298 if (!Val) return nullptr;
299 assert(isa<X>(Val) && "cast_or_null<Ty>() argument of incompatible type!")(static_cast <bool> (isa<X>(Val) && "cast_or_null<Ty>() argument of incompatible type!"
) ? void (0) : __assert_fail ("isa<X>(Val) && \"cast_or_null<Ty>() argument of incompatible type!\""
, "/build/llvm-toolchain-snapshot-7~svn326246/include/llvm/Support/Casting.h"
, 299, __extension__ __PRETTY_FUNCTION__))
;
300 return cast<X>(Val);
301}
302
303template <class X, class Y>
304inline typename cast_retty<X, std::unique_ptr<Y>>::ret_type
305cast_or_null(std::unique_ptr<Y> &&Val) {
306 if (!Val)
307 return nullptr;
308 return cast<X>(std::move(Val));
309}
310
311// dyn_cast<X> - Return the argument parameter cast to the specified type. This
312// casting operator returns null if the argument is of the wrong type, so it can
313// be used to test for a type as well as cast if successful. This should be
314// used in the context of an if statement like this:
315//
316// if (const Instruction *I = dyn_cast<Instruction>(myVal)) { ... }
317//
318
319template <class X, class Y>
320LLVM_NODISCARD[[clang::warn_unused_result]] inline
321 typename std::enable_if<!is_simple_type<Y>::value,
322 typename cast_retty<X, const Y>::ret_type>::type
323 dyn_cast(const Y &Val) {
324 return isa<X>(Val) ? cast<X>(Val) : nullptr;
325}
326
327template <class X, class Y>
328LLVM_NODISCARD[[clang::warn_unused_result]] inline typename cast_retty<X, Y>::ret_type dyn_cast(Y &Val) {
329 return isa<X>(Val) ? cast<X>(Val) : nullptr;
330}
331
332template <class X, class Y>
333LLVM_NODISCARD[[clang::warn_unused_result]] inline typename cast_retty<X, Y *>::ret_type dyn_cast(Y *Val) {
334 return isa<X>(Val) ? cast<X>(Val) : nullptr;
335}
336
337// dyn_cast_or_null<X> - Functionally identical to dyn_cast, except that a null
338// value is accepted.
339//
340template <class X, class Y>
341LLVM_NODISCARD[[clang::warn_unused_result]] inline
342 typename std::enable_if<!is_simple_type<Y>::value,
343 typename cast_retty<X, const Y>::ret_type>::type
344 dyn_cast_or_null(const Y &Val) {
345 return (Val && isa<X>(Val)) ? cast<X>(Val) : nullptr;
346}
347
348template <class X, class Y>
349LLVM_NODISCARD[[clang::warn_unused_result]] inline
350 typename std::enable_if<!is_simple_type<Y>::value,
351 typename cast_retty<X, Y>::ret_type>::type
352 dyn_cast_or_null(Y &Val) {
353 return (Val && isa<X>(Val)) ? cast<X>(Val) : nullptr;
354}
355
356template <class X, class Y>
357LLVM_NODISCARD[[clang::warn_unused_result]] inline typename cast_retty<X, Y *>::ret_type
358dyn_cast_or_null(Y *Val) {
359 return (Val && isa<X>(Val)) ? cast<X>(Val) : nullptr;
360}
361
362// unique_dyn_cast<X> - Given a unique_ptr<Y>, try to return a unique_ptr<X>,
363// taking ownership of the input pointer iff isa<X>(Val) is true. If the
364// cast is successful, From refers to nullptr on exit and the casted value
365// is returned. If the cast is unsuccessful, the function returns nullptr
366// and From is unchanged.
367template <class X, class Y>
368LLVM_NODISCARD[[clang::warn_unused_result]] inline auto unique_dyn_cast(std::unique_ptr<Y> &Val)
369 -> decltype(cast<X>(Val)) {
370 if (!isa<X>(Val))
371 return nullptr;
372 return cast<X>(std::move(Val));
373}
374
375template <class X, class Y>
376LLVM_NODISCARD[[clang::warn_unused_result]] inline auto unique_dyn_cast(std::unique_ptr<Y> &&Val)
377 -> decltype(cast<X>(Val)) {
378 return unique_dyn_cast<X, Y>(Val);
379}
380
381// dyn_cast_or_null<X> - Functionally identical to unique_dyn_cast, except that
382// a null value is accepted.
383template <class X, class Y>
384LLVM_NODISCARD[[clang::warn_unused_result]] inline auto unique_dyn_cast_or_null(std::unique_ptr<Y> &Val)
385 -> decltype(cast<X>(Val)) {
386 if (!Val)
387 return nullptr;
388 return unique_dyn_cast<X, Y>(Val);
389}
390
391template <class X, class Y>
392LLVM_NODISCARD[[clang::warn_unused_result]] inline auto unique_dyn_cast_or_null(std::unique_ptr<Y> &&Val)
393 -> decltype(cast<X>(Val)) {
394 return unique_dyn_cast_or_null<X, Y>(Val);
395}
396
397} // end namespace llvm
398
399#endif // LLVM_SUPPORT_CASTING_H

/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/include/clang/AST/Decl.h

1//===- Decl.h - Classes for representing declarations -----------*- C++ -*-===//
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 file defines the Decl subclasses.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_CLANG_AST_DECL_H
15#define LLVM_CLANG_AST_DECL_H
16
17#include "clang/AST/APValue.h"
18#include "clang/AST/DeclBase.h"
19#include "clang/AST/DeclarationName.h"
20#include "clang/AST/ExternalASTSource.h"
21#include "clang/AST/NestedNameSpecifier.h"
22#include "clang/AST/Redeclarable.h"
23#include "clang/AST/Type.h"
24#include "clang/Basic/AddressSpaces.h"
25#include "clang/Basic/Diagnostic.h"
26#include "clang/Basic/IdentifierTable.h"
27#include "clang/Basic/LLVM.h"
28#include "clang/Basic/Linkage.h"
29#include "clang/Basic/OperatorKinds.h"
30#include "clang/Basic/PartialDiagnostic.h"
31#include "clang/Basic/PragmaKinds.h"
32#include "clang/Basic/SourceLocation.h"
33#include "clang/Basic/Specifiers.h"
34#include "clang/Basic/Visibility.h"
35#include "llvm/ADT/APSInt.h"
36#include "llvm/ADT/ArrayRef.h"
37#include "llvm/ADT/Optional.h"
38#include "llvm/ADT/PointerIntPair.h"
39#include "llvm/ADT/PointerUnion.h"
40#include "llvm/ADT/StringRef.h"
41#include "llvm/ADT/iterator_range.h"
42#include "llvm/Support/Casting.h"
43#include "llvm/Support/Compiler.h"
44#include "llvm/Support/TrailingObjects.h"
45#include <cassert>
46#include <cstddef>
47#include <cstdint>
48#include <string>
49#include <utility>
50
51namespace clang {
52
53class ASTContext;
54struct ASTTemplateArgumentListInfo;
55class Attr;
56class CompoundStmt;
57class DependentFunctionTemplateSpecializationInfo;
58class EnumDecl;
59class Expr;
60class FunctionTemplateDecl;
61class FunctionTemplateSpecializationInfo;
62class LabelStmt;
63class MemberSpecializationInfo;
64class Module;
65class NamespaceDecl;
66class ParmVarDecl;
67class RecordDecl;
68class Stmt;
69class StringLiteral;
70class TagDecl;
71class TemplateArgumentList;
72class TemplateArgumentListInfo;
73class TemplateParameterList;
74class TypeAliasTemplateDecl;
75class TypeLoc;
76class UnresolvedSetImpl;
77class VarTemplateDecl;
78
79/// A container of type source information.
80///
81/// A client can read the relevant info using TypeLoc wrappers, e.g:
82/// @code
83/// TypeLoc TL = TypeSourceInfo->getTypeLoc();
84/// TL.getStartLoc().print(OS, SrcMgr);
85/// @endcode
86class LLVM_ALIGNAS(8)alignas(8) TypeSourceInfo {
87 // Contains a memory block after the class, used for type source information,
88 // allocated by ASTContext.
89 friend class ASTContext;
90
91 QualType Ty;
92
93 TypeSourceInfo(QualType ty) : Ty(ty) {}
94
95public:
96 /// Return the type wrapped by this type source info.
97 QualType getType() const { return Ty; }
98
99 /// Return the TypeLoc wrapper for the type source info.
100 TypeLoc getTypeLoc() const; // implemented in TypeLoc.h
101
102 /// Override the type stored in this TypeSourceInfo. Use with caution!
103 void overrideType(QualType T) { Ty = T; }
104};
105
106/// The top declaration context.
107class TranslationUnitDecl : public Decl, public DeclContext {
108 ASTContext &Ctx;
109
110 /// The (most recently entered) anonymous namespace for this
111 /// translation unit, if one has been created.
112 NamespaceDecl *AnonymousNamespace = nullptr;
113
114 explicit TranslationUnitDecl(ASTContext &ctx);
115
116 virtual void anchor();
117
118public:
119 ASTContext &getASTContext() const { return Ctx; }
120
121 NamespaceDecl *getAnonymousNamespace() const { return AnonymousNamespace; }
122 void setAnonymousNamespace(NamespaceDecl *D) { AnonymousNamespace = D; }
123
124 static TranslationUnitDecl *Create(ASTContext &C);
125
126 // Implement isa/cast/dyncast/etc.
127 static bool classof(const Decl *D) { return classofKind(D->getKind()); }
128 static bool classofKind(Kind K) { return K == TranslationUnit; }
129 static DeclContext *castToDeclContext(const TranslationUnitDecl *D) {
130 return static_cast<DeclContext *>(const_cast<TranslationUnitDecl*>(D));
131 }
132 static TranslationUnitDecl *castFromDeclContext(const DeclContext *DC) {
133 return static_cast<TranslationUnitDecl *>(const_cast<DeclContext*>(DC));
134 }
135};
136
137/// Represents a `#pragma comment` line. Always a child of
138/// TranslationUnitDecl.
139class PragmaCommentDecl final
140 : public Decl,
141 private llvm::TrailingObjects<PragmaCommentDecl, char> {
142 friend class ASTDeclReader;
143 friend class ASTDeclWriter;
144 friend TrailingObjects;
145
146 PragmaMSCommentKind CommentKind;
147
148 PragmaCommentDecl(TranslationUnitDecl *TU, SourceLocation CommentLoc,
149 PragmaMSCommentKind CommentKind)
150 : Decl(PragmaComment, TU, CommentLoc), CommentKind(CommentKind) {}
151
152 virtual void anchor();
153
154public:
155 static PragmaCommentDecl *Create(const ASTContext &C, TranslationUnitDecl *DC,
156 SourceLocation CommentLoc,
157 PragmaMSCommentKind CommentKind,
158 StringRef Arg);
159 static PragmaCommentDecl *CreateDeserialized(ASTContext &C, unsigned ID,
160 unsigned ArgSize);
161
162 PragmaMSCommentKind getCommentKind() const { return CommentKind; }
163
164 StringRef getArg() const { return getTrailingObjects<char>(); }
165
166 // Implement isa/cast/dyncast/etc.
167 static bool classof(const Decl *D) { return classofKind(D->getKind()); }
168 static bool classofKind(Kind K) { return K == PragmaComment; }
169};
170
171/// Represents a `#pragma detect_mismatch` line. Always a child of
172/// TranslationUnitDecl.
173class PragmaDetectMismatchDecl final
174 : public Decl,
175 private llvm::TrailingObjects<PragmaDetectMismatchDecl, char> {
176 friend class ASTDeclReader;
177 friend class ASTDeclWriter;
178 friend TrailingObjects;
179
180 size_t ValueStart;
181
182 PragmaDetectMismatchDecl(TranslationUnitDecl *TU, SourceLocation Loc,
183 size_t ValueStart)
184 : Decl(PragmaDetectMismatch, TU, Loc), ValueStart(ValueStart) {}
185
186 virtual void anchor();
187
188public:
189 static PragmaDetectMismatchDecl *Create(const ASTContext &C,
190 TranslationUnitDecl *DC,
191 SourceLocation Loc, StringRef Name,
192 StringRef Value);
193 static PragmaDetectMismatchDecl *
194 CreateDeserialized(ASTContext &C, unsigned ID, unsigned NameValueSize);
195
196 StringRef getName() const { return getTrailingObjects<char>(); }
197 StringRef getValue() const { return getTrailingObjects<char>() + ValueStart; }
198
199 // Implement isa/cast/dyncast/etc.
200 static bool classof(const Decl *D) { return classofKind(D->getKind()); }
201 static bool classofKind(Kind K) { return K == PragmaDetectMismatch; }
202};
203
204/// Declaration context for names declared as extern "C" in C++. This
205/// is neither the semantic nor lexical context for such declarations, but is
206/// used to check for conflicts with other extern "C" declarations. Example:
207///
208/// \code
209/// namespace N { extern "C" void f(); } // #1
210/// void N::f() {} // #2
211/// namespace M { extern "C" void f(); } // #3
212/// \endcode
213///
214/// The semantic context of #1 is namespace N and its lexical context is the
215/// LinkageSpecDecl; the semantic context of #2 is namespace N and its lexical
216/// context is the TU. However, both declarations are also visible in the
217/// extern "C" context.
218///
219/// The declaration at #3 finds it is a redeclaration of \c N::f through
220/// lookup in the extern "C" context.
221class ExternCContextDecl : public Decl, public DeclContext {
222 explicit ExternCContextDecl(TranslationUnitDecl *TU)
223 : Decl(ExternCContext, TU, SourceLocation()),
224 DeclContext(ExternCContext) {}
225
226 virtual void anchor();
227
228public:
229 static ExternCContextDecl *Create(const ASTContext &C,
230 TranslationUnitDecl *TU);
231
232 // Implement isa/cast/dyncast/etc.
233 static bool classof(const Decl *D) { return classofKind(D->getKind()); }
234 static bool classofKind(Kind K) { return K == ExternCContext; }
235 static DeclContext *castToDeclContext(const ExternCContextDecl *D) {
236 return static_cast<DeclContext *>(const_cast<ExternCContextDecl*>(D));
237 }
238 static ExternCContextDecl *castFromDeclContext(const DeclContext *DC) {
239 return static_cast<ExternCContextDecl *>(const_cast<DeclContext*>(DC));
240 }
241};
242
243/// This represents a decl that may have a name. Many decls have names such
244/// as ObjCMethodDecl, but not \@class, etc.
245///
246/// Note that not every NamedDecl is actually named (e.g., a struct might
247/// be anonymous), and not every name is an identifier.
248class NamedDecl : public Decl {
249 /// The name of this declaration, which is typically a normal
250 /// identifier but may also be a special kind of name (C++
251 /// constructor, Objective-C selector, etc.)
252 DeclarationName Name;
253
254 virtual void anchor();
255
256private:
257 NamedDecl *getUnderlyingDeclImpl() LLVM_READONLY__attribute__((__pure__));
258
259protected:
260 NamedDecl(Kind DK, DeclContext *DC, SourceLocation L, DeclarationName N)
261 : Decl(DK, DC, L), Name(N) {}
262
263public:
264 /// Get the identifier that names this declaration, if there is one.
265 ///
266 /// This will return NULL if this declaration has no name (e.g., for
267 /// an unnamed class) or if the name is a special name (C++ constructor,
268 /// Objective-C selector, etc.).
269 IdentifierInfo *getIdentifier() const { return Name.getAsIdentifierInfo(); }
270
271 /// Get the name of identifier for this declaration as a StringRef.
272 ///
273 /// This requires that the declaration have a name and that it be a simple
274 /// identifier.
275 StringRef getName() const {
276 assert(Name.isIdentifier() && "Name is not a simple identifier")(static_cast <bool> (Name.isIdentifier() && "Name is not a simple identifier"
) ? void (0) : __assert_fail ("Name.isIdentifier() && \"Name is not a simple identifier\""
, "/build/llvm-toolchain-snapshot-7~svn326246/tools/clang/include/clang/AST/Decl.h"
, 276, __extension__ __PRETTY_FUNCTION__))
;
277 return getIdentifier() ? getIdentifier()->getName() : "";
278 }
279
280 /// Get a human-readable name for the declaration, even if it is one of the
281 /// special kinds of names (C++ constructor, Objective-C selector, etc).
282 ///
283 /// Creating this name requires expensive string manipulation, so it should
284 /// be called only when performance doesn't matter. For simple declarations,
285 /// getNameAsCString() should suffice.
286 //
287 // FIXME: This function should be renamed to indicate that it is not just an
288 // alternate form of getName(), and clients should move as appropriate.
289 //
290 // FIXME: Deprecated, move clients to getName().
291 std::string getNameAsString() const { return Name.getAsString(); }
292
293 virtual void printName(raw_ostream &os) const;
294
295 /// Get the actual, stored name of the declaration, which may be a special
296 /// name.
297 DeclarationName getDeclName() const { return Name; }
298
299 /// Set the name of this declaration.
300 void setDeclName(DeclarationName N) { Name = N; }
301
302 /// Returns a human-readable qualified name for this declaration, like
303 /// A::B::i, for i being member of namespace A::B.
304 ///
305 /// If the declaration is not a member of context which can be named (record,
306 /// namespace), it will return the same result as printName().
307 ///
308 /// Creating this name is expensive, so it should be called only when
309 /// performance doesn't matter.
310 void printQualifiedName(raw_ostream &OS) const;
311 void printQualifiedName(raw_ostream &OS, const PrintingPolicy &Policy) const;
312
313 // FIXME: Remove string version.
314 std::string getQualifiedNameAsString() const;
315
316 /// Appends a human-readable name for this declaration into the given stream.
317 ///
318 /// This is the method invoked by Sema when displaying a NamedDecl
319 /// in a diagnostic. It does not necessarily produce the same
320 /// result as printName(); for example, class template
321 /// specializations are printed with their template arguments.
322 virtual void getNameForDiagnostic(raw_ostream &OS,
323 const PrintingPolicy &Policy,
324 bool Qualified) const;
325
326 /// Determine whether this declaration, if known to be well-formed within
327 /// its context, will replace the declaration OldD if introduced into scope.
328 ///
329 /// A declaration will replace another declaration if, for example, it is
330 /// a redeclaration of the same variable or function, but not if it is a
331 /// declaration of a different kind (function vs. class) or an overloaded
332 /// function.
333 ///
334 /// \param IsKnownNewer \c true if this declaration is known to be newer
335 /// than \p OldD (for instance, if this declaration is newly-created).
336 bool declarationReplaces(NamedDecl *OldD, bool IsKnownNewer = true) const;
337
338 /// Determine whether this declaration has linkage.
339 bool hasLinkage() const;
340
341 using Decl::isModulePrivate;
342 using Decl::setModulePrivate;
343
344 /// Determine whether this declaration is a C++ class member.
345 bool isCXXClassMember() const {
346 const DeclContext *DC = getDeclContext();
347
348 // C++0x [class.mem]p1:
349 // The enumerators of an unscoped enumeration defined in
350 // the class are members of the class.
351 if (isa<EnumDecl>(DC))
352 DC = DC->getRedeclContext();
353
354 return DC->isRecord();
355 }
356
357 /// Determine whether the given declaration is an instance member of
358 /// a C++ class.
359 bool isCXXInstanceMember() const;
360
361 /// Determine what kind of linkage this entity has.
362 ///
363 /// This is not the linkage as defined by the standard or the codegen notion
364 /// of linkage. It is just an implementation detail that is used to compute
365 /// those.
366 Linkage getLinkageInternal() const;
367
368 /// Get the linkage from a semantic point of view. Entities in
369 /// anonymous namespaces are external (in c++98).
370 Linkage getFormalLinkage() const {
371 return clang::getFormalLinkage(getLinkageInternal());
372 }
373
374 /// True if this decl has external linkage.
375 bool hasExternalFormalLinkage() const {
376 return isExternalFormalLinkage(getLinkageInternal());
377 }
378
379 bool isExternallyVisible() const {
380 return clang::isExternallyVisible(getLinkageInternal());
381 }
382
383 /// Determine whether this declaration can be redeclared in a
384 /// different translation unit.
385 bool isExternallyDeclarable() const {
386 return isExternallyVisible() && !getOwningModuleForLinkage();
387 }
388
389 /// Determines the visibility of this entity.
390 Visibility getVisibility() const {
391 return getLinkageAndVisibility().getVisibility();
392 }
393
394 /// Determines the linkage and visibility of this entity.
395 LinkageInfo getLinkageAndVisibility() const;
396
397 /// Kinds of explicit visibility.
398 enum ExplicitVisibilityKind {
399 /// Do an LV computation for, ultimately, a type.
400 /// Visibility may be restricted by type visibility settings and
401 /// the visibility of template arguments.
402 VisibilityForType,
403
404 /// Do an LV computation for, ultimately, a non-type declaration.
405 /// Visibility may be restricted by value visibility settings and
406 /// the visibility of template arguments.
407 VisibilityForValue
408 };
409
410 /// If visibility was explicitly specified for this
411 /// declaration, return that visibility.
412 Optional<Visibility>
413 getExplicitVisibility(ExplicitVisibilityKind kind) const;
414
415 /// True if the computed linkage is valid. Used for consistency
416 /// checking. Should always return true.
417 bool isLinkageValid() const;
418
419 /// True if something has required us to compute the linkage
420 /// of this declaration.
421 ///
422 /// Language features which can retroactively change linkage (like a
423 /// typedef name for linkage purposes) may need to consider this,
424 /// but hopefully only in transitory ways during parsing.
425 bool hasLinkageBeenComputed() const {
426 return hasCachedLinkage();
427 }
428
429 /// Looks through UsingDecls and ObjCCompatibleAliasDecls for
430 /// the underlying named decl.
431 NamedDecl *getUnderlyingDecl() {
432 // Fast-path the common case.
433 if (this->getKind() != UsingShadow &&
434 this->getKind() != ConstructorUsingShadow &&
435 this->getKind() != ObjCCompatibleAlias &&
436 this->getKind() != NamespaceAlias)
437 return this;
438
439 return getUnderlyingDeclImpl();
440 }
441 const NamedDecl *getUnderlyingDecl() const {
442 return const_cast<NamedDecl*>(this)->getUnderlyingDecl();
443 }
444
445 NamedDecl *getMostRecentDecl() {
446 return cast<NamedDecl>(static_cast<Decl *>(this)->getMostRecentDecl());
447 }