Bug Summary

File:clang/lib/CodeGen/CodeGenModule.cpp
Warning:line 3531, column 27
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -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-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 -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mframe-pointer=none -relaxed-aliasing -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/build-llvm/tools/clang/lib/CodeGen -resource-dir /usr/lib/llvm-13/lib/clang/13.0.0 -D CLANG_ROUND_TRIP_CC1_ARGS=ON -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/build-llvm/tools/clang/lib/CodeGen -I /build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen -I /build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/include -I /build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/build-llvm/include -I /build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/llvm/include -D NDEBUG -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/x86_64-linux-gnu/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/backward -internal-isystem /usr/lib/llvm-13/lib/clang/13.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/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-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/build-llvm/tools/clang/lib/CodeGen -fdebug-prefix-map=/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b=. -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2021-06-17-010711-25934-1 -x c++ /build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp

/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp

1//===--- CodeGenModule.cpp - Emit LLVM Code from ASTs for a Module --------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This coordinates the per-module state used while generating code.
10//
11//===----------------------------------------------------------------------===//
12
13#include "CodeGenModule.h"
14#include "CGBlocks.h"
15#include "CGCUDARuntime.h"
16#include "CGCXXABI.h"
17#include "CGCall.h"
18#include "CGDebugInfo.h"
19#include "CGObjCRuntime.h"
20#include "CGOpenCLRuntime.h"
21#include "CGOpenMPRuntime.h"
22#include "CGOpenMPRuntimeAMDGCN.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/AST/StmtVisitor.h"
38#include "clang/Basic/Builtins.h"
39#include "clang/Basic/CharInfo.h"
40#include "clang/Basic/CodeGenOptions.h"
41#include "clang/Basic/Diagnostic.h"
42#include "clang/Basic/FileManager.h"
43#include "clang/Basic/Module.h"
44#include "clang/Basic/SourceManager.h"
45#include "clang/Basic/TargetInfo.h"
46#include "clang/Basic/Version.h"
47#include "clang/CodeGen/ConstantInitBuilder.h"
48#include "clang/Frontend/FrontendDiagnostic.h"
49#include "llvm/ADT/StringSwitch.h"
50#include "llvm/ADT/Triple.h"
51#include "llvm/Analysis/TargetLibraryInfo.h"
52#include "llvm/Frontend/OpenMP/OMPIRBuilder.h"
53#include "llvm/IR/CallingConv.h"
54#include "llvm/IR/DataLayout.h"
55#include "llvm/IR/Intrinsics.h"
56#include "llvm/IR/LLVMContext.h"
57#include "llvm/IR/Module.h"
58#include "llvm/IR/ProfileSummary.h"
59#include "llvm/ProfileData/InstrProfReader.h"
60#include "llvm/Support/CodeGen.h"
61#include "llvm/Support/CommandLine.h"
62#include "llvm/Support/ConvertUTF.h"
63#include "llvm/Support/ErrorHandling.h"
64#include "llvm/Support/MD5.h"
65#include "llvm/Support/TimeProfiler.h"
66
67using namespace clang;
68using namespace CodeGen;
69
70static llvm::cl::opt<bool> LimitedCoverage(
71 "limited-coverage-experimental", llvm::cl::ZeroOrMore, llvm::cl::Hidden,
72 llvm::cl::desc("Emit limited coverage mapping information (experimental)"),
73 llvm::cl::init(false));
74
75static const char AnnotationSection[] = "llvm.metadata";
76
77static CGCXXABI *createCXXABI(CodeGenModule &CGM) {
78 switch (CGM.getContext().getCXXABIKind()) {
79 case TargetCXXABI::AppleARM64:
80 case TargetCXXABI::Fuchsia:
81 case TargetCXXABI::GenericAArch64:
82 case TargetCXXABI::GenericARM:
83 case TargetCXXABI::iOS:
84 case TargetCXXABI::WatchOS:
85 case TargetCXXABI::GenericMIPS:
86 case TargetCXXABI::GenericItanium:
87 case TargetCXXABI::WebAssembly:
88 case TargetCXXABI::XL:
89 return CreateItaniumCXXABI(CGM);
90 case TargetCXXABI::Microsoft:
91 return CreateMicrosoftCXXABI(CGM);
92 }
93
94 llvm_unreachable("invalid C++ ABI kind")::llvm::llvm_unreachable_internal("invalid C++ ABI kind", "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 94)
;
95}
96
97CodeGenModule::CodeGenModule(ASTContext &C, const HeaderSearchOptions &HSO,
98 const PreprocessorOptions &PPO,
99 const CodeGenOptions &CGO, llvm::Module &M,
100 DiagnosticsEngine &diags,
101 CoverageSourceInfo *CoverageInfo)
102 : Context(C), LangOpts(C.getLangOpts()), HeaderSearchOpts(HSO),
103 PreprocessorOpts(PPO), CodeGenOpts(CGO), TheModule(M), Diags(diags),
104 Target(C.getTargetInfo()), ABI(createCXXABI(*this)),
105 VMContext(M.getContext()), Types(*this), VTables(*this),
106 SanitizerMD(new SanitizerMetadata(*this)) {
107
108 // Initialize the type cache.
109 llvm::LLVMContext &LLVMContext = M.getContext();
110 VoidTy = llvm::Type::getVoidTy(LLVMContext);
111 Int8Ty = llvm::Type::getInt8Ty(LLVMContext);
112 Int16Ty = llvm::Type::getInt16Ty(LLVMContext);
113 Int32Ty = llvm::Type::getInt32Ty(LLVMContext);
114 Int64Ty = llvm::Type::getInt64Ty(LLVMContext);
115 HalfTy = llvm::Type::getHalfTy(LLVMContext);
116 BFloatTy = llvm::Type::getBFloatTy(LLVMContext);
117 FloatTy = llvm::Type::getFloatTy(LLVMContext);
118 DoubleTy = llvm::Type::getDoubleTy(LLVMContext);
119 PointerWidthInBits = C.getTargetInfo().getPointerWidth(0);
120 PointerAlignInBytes =
121 C.toCharUnitsFromBits(C.getTargetInfo().getPointerAlign(0)).getQuantity();
122 SizeSizeInBytes =
123 C.toCharUnitsFromBits(C.getTargetInfo().getMaxPointerWidth()).getQuantity();
124 IntAlignInBytes =
125 C.toCharUnitsFromBits(C.getTargetInfo().getIntAlign()).getQuantity();
126 CharTy =
127 llvm::IntegerType::get(LLVMContext, C.getTargetInfo().getCharWidth());
128 IntTy = llvm::IntegerType::get(LLVMContext, C.getTargetInfo().getIntWidth());
129 IntPtrTy = llvm::IntegerType::get(LLVMContext,
130 C.getTargetInfo().getMaxPointerWidth());
131 Int8PtrTy = Int8Ty->getPointerTo(0);
132 Int8PtrPtrTy = Int8PtrTy->getPointerTo(0);
133 AllocaInt8PtrTy = Int8Ty->getPointerTo(
134 M.getDataLayout().getAllocaAddrSpace());
135 ASTAllocaAddressSpace = getTargetCodeGenInfo().getASTAllocaAddressSpace();
136
137 RuntimeCC = getTargetCodeGenInfo().getABIInfo().getRuntimeCC();
138
139 if (LangOpts.ObjC)
140 createObjCRuntime();
141 if (LangOpts.OpenCL)
142 createOpenCLRuntime();
143 if (LangOpts.OpenMP)
144 createOpenMPRuntime();
145 if (LangOpts.CUDA)
146 createCUDARuntime();
147
148 // Enable TBAA unless it's suppressed. ThreadSanitizer needs TBAA even at O0.
149 if (LangOpts.Sanitize.has(SanitizerKind::Thread) ||
150 (!CodeGenOpts.RelaxedAliasing && CodeGenOpts.OptimizationLevel > 0))
151 TBAA.reset(new CodeGenTBAA(Context, TheModule, CodeGenOpts, getLangOpts(),
152 getCXXABI().getMangleContext()));
153
154 // If debug info or coverage generation is enabled, create the CGDebugInfo
155 // object.
156 if (CodeGenOpts.getDebugInfo() != codegenoptions::NoDebugInfo ||
157 CodeGenOpts.EmitGcovArcs || CodeGenOpts.EmitGcovNotes)
158 DebugInfo.reset(new CGDebugInfo(*this));
159
160 Block.GlobalUniqueCount = 0;
161
162 if (C.getLangOpts().ObjC)
163 ObjCData.reset(new ObjCEntrypoints());
164
165 if (CodeGenOpts.hasProfileClangUse()) {
166 auto ReaderOrErr = llvm::IndexedInstrProfReader::create(
167 CodeGenOpts.ProfileInstrumentUsePath, CodeGenOpts.ProfileRemappingFile);
168 if (auto E = ReaderOrErr.takeError()) {
169 unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
170 "Could not read profile %0: %1");
171 llvm::handleAllErrors(std::move(E), [&](const llvm::ErrorInfoBase &EI) {
172 getDiags().Report(DiagID) << CodeGenOpts.ProfileInstrumentUsePath
173 << EI.message();
174 });
175 } else
176 PGOReader = std::move(ReaderOrErr.get());
177 }
178
179 // If coverage mapping generation is enabled, create the
180 // CoverageMappingModuleGen object.
181 if (CodeGenOpts.CoverageMapping)
182 CoverageMapping.reset(new CoverageMappingModuleGen(*this, *CoverageInfo));
183
184 // Generate the module name hash here if needed.
185 if (CodeGenOpts.UniqueInternalLinkageNames &&
186 !getModule().getSourceFileName().empty()) {
187 std::string Path = getModule().getSourceFileName();
188 // Check if a path substitution is needed from the MacroPrefixMap.
189 for (const auto &Entry : PPO.MacroPrefixMap)
190 if (Path.rfind(Entry.first, 0) != std::string::npos) {
191 Path = Entry.second + Path.substr(Entry.first.size());
192 break;
193 }
194 llvm::MD5 Md5;
195 Md5.update(Path);
196 llvm::MD5::MD5Result R;
197 Md5.final(R);
198 SmallString<32> Str;
199 llvm::MD5::stringifyResult(R, Str);
200 // Convert MD5hash to Decimal. Demangler suffixes can either contain
201 // numbers or characters but not both.
202 llvm::APInt IntHash(128, Str.str(), 16);
203 // Prepend "__uniq" before the hash for tools like profilers to understand
204 // that this symbol is of internal linkage type. The "__uniq" is the
205 // pre-determined prefix that is used to tell tools that this symbol was
206 // created with -funique-internal-linakge-symbols and the tools can strip or
207 // keep the prefix as needed.
208 ModuleNameHash = (Twine(".__uniq.") +
209 Twine(toString(IntHash, /* Radix = */ 10, /* Signed = */false))).str();
210 }
211}
212
213CodeGenModule::~CodeGenModule() {}
214
215void CodeGenModule::createObjCRuntime() {
216 // This is just isGNUFamily(), but we want to force implementors of
217 // new ABIs to decide how best to do this.
218 switch (LangOpts.ObjCRuntime.getKind()) {
219 case ObjCRuntime::GNUstep:
220 case ObjCRuntime::GCC:
221 case ObjCRuntime::ObjFW:
222 ObjCRuntime.reset(CreateGNUObjCRuntime(*this));
223 return;
224
225 case ObjCRuntime::FragileMacOSX:
226 case ObjCRuntime::MacOSX:
227 case ObjCRuntime::iOS:
228 case ObjCRuntime::WatchOS:
229 ObjCRuntime.reset(CreateMacObjCRuntime(*this));
230 return;
231 }
232 llvm_unreachable("bad runtime kind")::llvm::llvm_unreachable_internal("bad runtime kind", "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 232)
;
233}
234
235void CodeGenModule::createOpenCLRuntime() {
236 OpenCLRuntime.reset(new CGOpenCLRuntime(*this));
237}
238
239void CodeGenModule::createOpenMPRuntime() {
240 // Select a specialized code generation class based on the target, if any.
241 // If it does not exist use the default implementation.
242 switch (getTriple().getArch()) {
243 case llvm::Triple::nvptx:
244 case llvm::Triple::nvptx64:
245 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 246, __extension__ __PRETTY_FUNCTION__))
246 "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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 246, __extension__ __PRETTY_FUNCTION__))
;
247 OpenMPRuntime.reset(new CGOpenMPRuntimeNVPTX(*this));
248 break;
249 case llvm::Triple::amdgcn:
250 assert(getLangOpts().OpenMPIsDevice &&(static_cast <bool> (getLangOpts().OpenMPIsDevice &&
"OpenMP AMDGCN is only prepared to deal with device code.") ?
void (0) : __assert_fail ("getLangOpts().OpenMPIsDevice && \"OpenMP AMDGCN is only prepared to deal with device code.\""
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 251, __extension__ __PRETTY_FUNCTION__))
251 "OpenMP AMDGCN is only prepared to deal with device code.")(static_cast <bool> (getLangOpts().OpenMPIsDevice &&
"OpenMP AMDGCN is only prepared to deal with device code.") ?
void (0) : __assert_fail ("getLangOpts().OpenMPIsDevice && \"OpenMP AMDGCN is only prepared to deal with device code.\""
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 251, __extension__ __PRETTY_FUNCTION__))
;
252 OpenMPRuntime.reset(new CGOpenMPRuntimeAMDGCN(*this));
253 break;
254 default:
255 if (LangOpts.OpenMPSimd)
256 OpenMPRuntime.reset(new CGOpenMPSIMDRuntime(*this));
257 else
258 OpenMPRuntime.reset(new CGOpenMPRuntime(*this));
259 break;
260 }
261}
262
263void CodeGenModule::createCUDARuntime() {
264 CUDARuntime.reset(CreateNVCUDARuntime(*this));
265}
266
267void CodeGenModule::addReplacement(StringRef Name, llvm::Constant *C) {
268 Replacements[Name] = C;
269}
270
271void CodeGenModule::applyReplacements() {
272 for (auto &I : Replacements) {
273 StringRef MangledName = I.first();
274 llvm::Constant *Replacement = I.second;
275 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
276 if (!Entry)
277 continue;
278 auto *OldF = cast<llvm::Function>(Entry);
279 auto *NewF = dyn_cast<llvm::Function>(Replacement);
280 if (!NewF) {
281 if (auto *Alias = dyn_cast<llvm::GlobalAlias>(Replacement)) {
282 NewF = dyn_cast<llvm::Function>(Alias->getAliasee());
283 } else {
284 auto *CE = cast<llvm::ConstantExpr>(Replacement);
285 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 286, __extension__ __PRETTY_FUNCTION__))
286 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 286, __extension__ __PRETTY_FUNCTION__))
;
287 NewF = dyn_cast<llvm::Function>(CE->getOperand(0));
288 }
289 }
290
291 // Replace old with new, but keep the old order.
292 OldF->replaceAllUsesWith(Replacement);
293 if (NewF) {
294 NewF->removeFromParent();
295 OldF->getParent()->getFunctionList().insertAfter(OldF->getIterator(),
296 NewF);
297 }
298 OldF->eraseFromParent();
299 }
300}
301
302void CodeGenModule::addGlobalValReplacement(llvm::GlobalValue *GV, llvm::Constant *C) {
303 GlobalValReplacements.push_back(std::make_pair(GV, C));
304}
305
306void CodeGenModule::applyGlobalValReplacements() {
307 for (auto &I : GlobalValReplacements) {
308 llvm::GlobalValue *GV = I.first;
309 llvm::Constant *C = I.second;
310
311 GV->replaceAllUsesWith(C);
312 GV->eraseFromParent();
313 }
314}
315
316// This is only used in aliases that we created and we know they have a
317// linear structure.
318static const llvm::GlobalObject *getAliasedGlobal(
319 const llvm::GlobalIndirectSymbol &GIS) {
320 llvm::SmallPtrSet<const llvm::GlobalIndirectSymbol*, 4> Visited;
321 const llvm::Constant *C = &GIS;
322 for (;;) {
323 C = C->stripPointerCasts();
324 if (auto *GO = dyn_cast<llvm::GlobalObject>(C))
325 return GO;
326 // stripPointerCasts will not walk over weak aliases.
327 auto *GIS2 = dyn_cast<llvm::GlobalIndirectSymbol>(C);
328 if (!GIS2)
329 return nullptr;
330 if (!Visited.insert(GIS2).second)
331 return nullptr;
332 C = GIS2->getIndirectSymbol();
333 }
334}
335
336void CodeGenModule::checkAliases() {
337 // Check if the constructed aliases are well formed. It is really unfortunate
338 // that we have to do this in CodeGen, but we only construct mangled names
339 // and aliases during codegen.
340 bool Error = false;
341 DiagnosticsEngine &Diags = getDiags();
342 for (const GlobalDecl &GD : Aliases) {
343 const auto *D = cast<ValueDecl>(GD.getDecl());
344 SourceLocation Location;
345 bool IsIFunc = D->hasAttr<IFuncAttr>();
346 if (const Attr *A = D->getDefiningAttr())
347 Location = A->getLocation();
348 else
349 llvm_unreachable("Not an alias or ifunc?")::llvm::llvm_unreachable_internal("Not an alias or ifunc?", "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 349)
;
350 StringRef MangledName = getMangledName(GD);
351 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
352 auto *Alias = cast<llvm::GlobalIndirectSymbol>(Entry);
353 const llvm::GlobalValue *GV = getAliasedGlobal(*Alias);
354 if (!GV) {
355 Error = true;
356 Diags.Report(Location, diag::err_cyclic_alias) << IsIFunc;
357 } else if (GV->isDeclaration()) {
358 Error = true;
359 Diags.Report(Location, diag::err_alias_to_undefined)
360 << IsIFunc << IsIFunc;
361 } else if (IsIFunc) {
362 // Check resolver function type.
363 llvm::FunctionType *FTy = dyn_cast<llvm::FunctionType>(
364 GV->getType()->getPointerElementType());
365 assert(FTy)(static_cast <bool> (FTy) ? void (0) : __assert_fail ("FTy"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 365, __extension__ __PRETTY_FUNCTION__))
;
366 if (!FTy->getReturnType()->isPointerTy())
367 Diags.Report(Location, diag::err_ifunc_resolver_return);
368 }
369
370 llvm::Constant *Aliasee = Alias->getIndirectSymbol();
371 llvm::GlobalValue *AliaseeGV;
372 if (auto CE = dyn_cast<llvm::ConstantExpr>(Aliasee))
373 AliaseeGV = cast<llvm::GlobalValue>(CE->getOperand(0));
374 else
375 AliaseeGV = cast<llvm::GlobalValue>(Aliasee);
376
377 if (const SectionAttr *SA = D->getAttr<SectionAttr>()) {
378 StringRef AliasSection = SA->getName();
379 if (AliasSection != AliaseeGV->getSection())
380 Diags.Report(SA->getLocation(), diag::warn_alias_with_section)
381 << AliasSection << IsIFunc << IsIFunc;
382 }
383
384 // We have to handle alias to weak aliases in here. LLVM itself disallows
385 // this since the object semantics would not match the IL one. For
386 // compatibility with gcc we implement it by just pointing the alias
387 // to its aliasee's aliasee. We also warn, since the user is probably
388 // expecting the link to be weak.
389 if (auto GA = dyn_cast<llvm::GlobalIndirectSymbol>(AliaseeGV)) {
390 if (GA->isInterposable()) {
391 Diags.Report(Location, diag::warn_alias_to_weak_alias)
392 << GV->getName() << GA->getName() << IsIFunc;
393 Aliasee = llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(
394 GA->getIndirectSymbol(), Alias->getType());
395 Alias->setIndirectSymbol(Aliasee);
396 }
397 }
398 }
399 if (!Error)
400 return;
401
402 for (const GlobalDecl &GD : Aliases) {
403 StringRef MangledName = getMangledName(GD);
404 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
405 auto *Alias = cast<llvm::GlobalIndirectSymbol>(Entry);
406 Alias->replaceAllUsesWith(llvm::UndefValue::get(Alias->getType()));
407 Alias->eraseFromParent();
408 }
409}
410
411void CodeGenModule::clear() {
412 DeferredDeclsToEmit.clear();
413 if (OpenMPRuntime)
414 OpenMPRuntime->clear();
415}
416
417void InstrProfStats::reportDiagnostics(DiagnosticsEngine &Diags,
418 StringRef MainFile) {
419 if (!hasDiagnostics())
420 return;
421 if (VisitedInMainFile > 0 && VisitedInMainFile == MissingInMainFile) {
422 if (MainFile.empty())
423 MainFile = "<stdin>";
424 Diags.Report(diag::warn_profile_data_unprofiled) << MainFile;
425 } else {
426 if (Mismatched > 0)
427 Diags.Report(diag::warn_profile_data_out_of_date) << Visited << Mismatched;
428
429 if (Missing > 0)
430 Diags.Report(diag::warn_profile_data_missing) << Visited << Missing;
431 }
432}
433
434static void setVisibilityFromDLLStorageClass(const clang::LangOptions &LO,
435 llvm::Module &M) {
436 if (!LO.VisibilityFromDLLStorageClass)
437 return;
438
439 llvm::GlobalValue::VisibilityTypes DLLExportVisibility =
440 CodeGenModule::GetLLVMVisibility(LO.getDLLExportVisibility());
441 llvm::GlobalValue::VisibilityTypes NoDLLStorageClassVisibility =
442 CodeGenModule::GetLLVMVisibility(LO.getNoDLLStorageClassVisibility());
443 llvm::GlobalValue::VisibilityTypes ExternDeclDLLImportVisibility =
444 CodeGenModule::GetLLVMVisibility(LO.getExternDeclDLLImportVisibility());
445 llvm::GlobalValue::VisibilityTypes ExternDeclNoDLLStorageClassVisibility =
446 CodeGenModule::GetLLVMVisibility(
447 LO.getExternDeclNoDLLStorageClassVisibility());
448
449 for (llvm::GlobalValue &GV : M.global_values()) {
450 if (GV.hasAppendingLinkage() || GV.hasLocalLinkage())
451 continue;
452
453 // Reset DSO locality before setting the visibility. This removes
454 // any effects that visibility options and annotations may have
455 // had on the DSO locality. Setting the visibility will implicitly set
456 // appropriate globals to DSO Local; however, this will be pessimistic
457 // w.r.t. to the normal compiler IRGen.
458 GV.setDSOLocal(false);
459
460 if (GV.isDeclarationForLinker()) {
461 GV.setVisibility(GV.getDLLStorageClass() ==
462 llvm::GlobalValue::DLLImportStorageClass
463 ? ExternDeclDLLImportVisibility
464 : ExternDeclNoDLLStorageClassVisibility);
465 } else {
466 GV.setVisibility(GV.getDLLStorageClass() ==
467 llvm::GlobalValue::DLLExportStorageClass
468 ? DLLExportVisibility
469 : NoDLLStorageClassVisibility);
470 }
471
472 GV.setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
473 }
474}
475
476void CodeGenModule::Release() {
477 EmitDeferred();
478 EmitVTablesOpportunistically();
479 applyGlobalValReplacements();
480 applyReplacements();
481 checkAliases();
482 emitMultiVersionFunctions();
483 EmitCXXGlobalInitFunc();
484 EmitCXXGlobalCleanUpFunc();
485 registerGlobalDtorsWithAtExit();
486 EmitCXXThreadLocalInitFunc();
487 if (ObjCRuntime)
488 if (llvm::Function *ObjCInitFunction = ObjCRuntime->ModuleInitFunction())
489 AddGlobalCtor(ObjCInitFunction);
490 if (Context.getLangOpts().CUDA && CUDARuntime) {
491 if (llvm::Function *CudaCtorFunction = CUDARuntime->finalizeModule())
492 AddGlobalCtor(CudaCtorFunction);
493 }
494 if (OpenMPRuntime) {
495 if (llvm::Function *OpenMPRequiresDirectiveRegFun =
496 OpenMPRuntime->emitRequiresDirectiveRegFun()) {
497 AddGlobalCtor(OpenMPRequiresDirectiveRegFun, 0);
498 }
499 OpenMPRuntime->createOffloadEntriesAndInfoMetadata();
500 OpenMPRuntime->clear();
501 }
502 if (PGOReader) {
503 getModule().setProfileSummary(
504 PGOReader->getSummary(/* UseCS */ false).getMD(VMContext),
505 llvm::ProfileSummary::PSK_Instr);
506 if (PGOStats.hasDiagnostics())
507 PGOStats.reportDiagnostics(getDiags(), getCodeGenOpts().MainFileName);
508 }
509 EmitCtorList(GlobalCtors, "llvm.global_ctors");
510 EmitCtorList(GlobalDtors, "llvm.global_dtors");
511 EmitGlobalAnnotations();
512 EmitStaticExternCAliases();
513 EmitDeferredUnusedCoverageMappings();
514 CodeGenPGO(*this).setValueProfilingFlag(getModule());
515 if (CoverageMapping)
516 CoverageMapping->emit();
517 if (CodeGenOpts.SanitizeCfiCrossDso) {
518 CodeGenFunction(*this).EmitCfiCheckFail();
519 CodeGenFunction(*this).EmitCfiCheckStub();
520 }
521 emitAtAvailableLinkGuard();
522 if (Context.getTargetInfo().getTriple().isWasm() &&
523 !Context.getTargetInfo().getTriple().isOSEmscripten()) {
524 EmitMainVoidAlias();
525 }
526 emitLLVMUsed();
527 if (SanStats)
528 SanStats->finish();
529
530 if (CodeGenOpts.Autolink &&
531 (Context.getLangOpts().Modules || !LinkerOptionsMetadata.empty())) {
532 EmitModuleLinkOptions();
533 }
534
535 // On ELF we pass the dependent library specifiers directly to the linker
536 // without manipulating them. This is in contrast to other platforms where
537 // they are mapped to a specific linker option by the compiler. This
538 // difference is a result of the greater variety of ELF linkers and the fact
539 // that ELF linkers tend to handle libraries in a more complicated fashion
540 // than on other platforms. This forces us to defer handling the dependent
541 // libs to the linker.
542 //
543 // CUDA/HIP device and host libraries are different. Currently there is no
544 // way to differentiate dependent libraries for host or device. Existing
545 // usage of #pragma comment(lib, *) is intended for host libraries on
546 // Windows. Therefore emit llvm.dependent-libraries only for host.
547 if (!ELFDependentLibraries.empty() && !Context.getLangOpts().CUDAIsDevice) {
548 auto *NMD = getModule().getOrInsertNamedMetadata("llvm.dependent-libraries");
549 for (auto *MD : ELFDependentLibraries)
550 NMD->addOperand(MD);
551 }
552
553 // Record mregparm value now so it is visible through rest of codegen.
554 if (Context.getTargetInfo().getTriple().getArch() == llvm::Triple::x86)
555 getModule().addModuleFlag(llvm::Module::Error, "NumRegisterParameters",
556 CodeGenOpts.NumRegisterParameters);
557
558 if (CodeGenOpts.DwarfVersion) {
559 getModule().addModuleFlag(llvm::Module::Max, "Dwarf Version",
560 CodeGenOpts.DwarfVersion);
561 }
562
563 if (CodeGenOpts.Dwarf64)
564 getModule().addModuleFlag(llvm::Module::Max, "DWARF64", 1);
565
566 if (Context.getLangOpts().SemanticInterposition)
567 // Require various optimization to respect semantic interposition.
568 getModule().setSemanticInterposition(1);
569
570 if (CodeGenOpts.EmitCodeView) {
571 // Indicate that we want CodeView in the metadata.
572 getModule().addModuleFlag(llvm::Module::Warning, "CodeView", 1);
573 }
574 if (CodeGenOpts.CodeViewGHash) {
575 getModule().addModuleFlag(llvm::Module::Warning, "CodeViewGHash", 1);
576 }
577 if (CodeGenOpts.ControlFlowGuard) {
578 // Function ID tables and checks for Control Flow Guard (cfguard=2).
579 getModule().addModuleFlag(llvm::Module::Warning, "cfguard", 2);
580 } else if (CodeGenOpts.ControlFlowGuardNoChecks) {
581 // Function ID tables for Control Flow Guard (cfguard=1).
582 getModule().addModuleFlag(llvm::Module::Warning, "cfguard", 1);
583 }
584 if (CodeGenOpts.EHContGuard) {
585 // Function ID tables for EH Continuation Guard.
586 getModule().addModuleFlag(llvm::Module::Warning, "ehcontguard", 1);
587 }
588 if (CodeGenOpts.OptimizationLevel > 0 && CodeGenOpts.StrictVTablePointers) {
589 // We don't support LTO with 2 with different StrictVTablePointers
590 // FIXME: we could support it by stripping all the information introduced
591 // by StrictVTablePointers.
592
593 getModule().addModuleFlag(llvm::Module::Error, "StrictVTablePointers",1);
594
595 llvm::Metadata *Ops[2] = {
596 llvm::MDString::get(VMContext, "StrictVTablePointers"),
597 llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
598 llvm::Type::getInt32Ty(VMContext), 1))};
599
600 getModule().addModuleFlag(llvm::Module::Require,
601 "StrictVTablePointersRequirement",
602 llvm::MDNode::get(VMContext, Ops));
603 }
604 if (getModuleDebugInfo())
605 // We support a single version in the linked module. The LLVM
606 // parser will drop debug info with a different version number
607 // (and warn about it, too).
608 getModule().addModuleFlag(llvm::Module::Warning, "Debug Info Version",
609 llvm::DEBUG_METADATA_VERSION);
610
611 // We need to record the widths of enums and wchar_t, so that we can generate
612 // the correct build attributes in the ARM backend. wchar_size is also used by
613 // TargetLibraryInfo.
614 uint64_t WCharWidth =
615 Context.getTypeSizeInChars(Context.getWideCharType()).getQuantity();
616 getModule().addModuleFlag(llvm::Module::Error, "wchar_size", WCharWidth);
617
618 llvm::Triple::ArchType Arch = Context.getTargetInfo().getTriple().getArch();
619 if ( Arch == llvm::Triple::arm
620 || Arch == llvm::Triple::armeb
621 || Arch == llvm::Triple::thumb
622 || Arch == llvm::Triple::thumbeb) {
623 // The minimum width of an enum in bytes
624 uint64_t EnumWidth = Context.getLangOpts().ShortEnums ? 1 : 4;
625 getModule().addModuleFlag(llvm::Module::Error, "min_enum_size", EnumWidth);
626 }
627
628 if (Arch == llvm::Triple::riscv32 || Arch == llvm::Triple::riscv64) {
629 StringRef ABIStr = Target.getABI();
630 llvm::LLVMContext &Ctx = TheModule.getContext();
631 getModule().addModuleFlag(llvm::Module::Error, "target-abi",
632 llvm::MDString::get(Ctx, ABIStr));
633 }
634
635 if (CodeGenOpts.SanitizeCfiCrossDso) {
636 // Indicate that we want cross-DSO control flow integrity checks.
637 getModule().addModuleFlag(llvm::Module::Override, "Cross-DSO CFI", 1);
638 }
639
640 if (CodeGenOpts.WholeProgramVTables) {
641 // Indicate whether VFE was enabled for this module, so that the
642 // vcall_visibility metadata added under whole program vtables is handled
643 // appropriately in the optimizer.
644 getModule().addModuleFlag(llvm::Module::Error, "Virtual Function Elim",
645 CodeGenOpts.VirtualFunctionElimination);
646 }
647
648 if (LangOpts.Sanitize.has(SanitizerKind::CFIICall)) {
649 getModule().addModuleFlag(llvm::Module::Override,
650 "CFI Canonical Jump Tables",
651 CodeGenOpts.SanitizeCfiCanonicalJumpTables);
652 }
653
654 if (CodeGenOpts.CFProtectionReturn &&
655 Target.checkCFProtectionReturnSupported(getDiags())) {
656 // Indicate that we want to instrument return control flow protection.
657 getModule().addModuleFlag(llvm::Module::Override, "cf-protection-return",
658 1);
659 }
660
661 if (CodeGenOpts.CFProtectionBranch &&
662 Target.checkCFProtectionBranchSupported(getDiags())) {
663 // Indicate that we want to instrument branch control flow protection.
664 getModule().addModuleFlag(llvm::Module::Override, "cf-protection-branch",
665 1);
666 }
667
668 if (Arch == llvm::Triple::aarch64 || Arch == llvm::Triple::aarch64_32 ||
669 Arch == llvm::Triple::aarch64_be) {
670 getModule().addModuleFlag(llvm::Module::Error,
671 "branch-target-enforcement",
672 LangOpts.BranchTargetEnforcement);
673
674 getModule().addModuleFlag(llvm::Module::Error, "sign-return-address",
675 LangOpts.hasSignReturnAddress());
676
677 getModule().addModuleFlag(llvm::Module::Error, "sign-return-address-all",
678 LangOpts.isSignReturnAddressScopeAll());
679
680 getModule().addModuleFlag(llvm::Module::Error,
681 "sign-return-address-with-bkey",
682 !LangOpts.isSignReturnAddressWithAKey());
683 }
684
685 if (!CodeGenOpts.MemoryProfileOutput.empty()) {
686 llvm::LLVMContext &Ctx = TheModule.getContext();
687 getModule().addModuleFlag(
688 llvm::Module::Error, "MemProfProfileFilename",
689 llvm::MDString::get(Ctx, CodeGenOpts.MemoryProfileOutput));
690 }
691
692 if (LangOpts.CUDAIsDevice && getTriple().isNVPTX()) {
693 // Indicate whether __nvvm_reflect should be configured to flush denormal
694 // floating point values to 0. (This corresponds to its "__CUDA_FTZ"
695 // property.)
696 getModule().addModuleFlag(llvm::Module::Override, "nvvm-reflect-ftz",
697 CodeGenOpts.FP32DenormalMode.Output !=
698 llvm::DenormalMode::IEEE);
699 }
700
701 if (LangOpts.EHAsynch)
702 getModule().addModuleFlag(llvm::Module::Warning, "eh-asynch", 1);
703
704 // Emit OpenCL specific module metadata: OpenCL/SPIR version.
705 if (LangOpts.OpenCL) {
706 EmitOpenCLMetadata();
707 // Emit SPIR version.
708 if (getTriple().isSPIR()) {
709 // SPIR v2.0 s2.12 - The SPIR version used by the module is stored in the
710 // opencl.spir.version named metadata.
711 // C++ is backwards compatible with OpenCL v2.0.
712 auto Version = LangOpts.OpenCLCPlusPlus ? 200 : LangOpts.OpenCLVersion;
713 llvm::Metadata *SPIRVerElts[] = {
714 llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
715 Int32Ty, Version / 100)),
716 llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
717 Int32Ty, (Version / 100 > 1) ? 0 : 2))};
718 llvm::NamedMDNode *SPIRVerMD =
719 TheModule.getOrInsertNamedMetadata("opencl.spir.version");
720 llvm::LLVMContext &Ctx = TheModule.getContext();
721 SPIRVerMD->addOperand(llvm::MDNode::get(Ctx, SPIRVerElts));
722 }
723 }
724
725 if (uint32_t PLevel = Context.getLangOpts().PICLevel) {
726 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 726, __extension__ __PRETTY_FUNCTION__))
;
727 getModule().setPICLevel(static_cast<llvm::PICLevel::Level>(PLevel));
728 if (Context.getLangOpts().PIE)
729 getModule().setPIELevel(static_cast<llvm::PIELevel::Level>(PLevel));
730 }
731
732 if (getCodeGenOpts().CodeModel.size() > 0) {
733 unsigned CM = llvm::StringSwitch<unsigned>(getCodeGenOpts().CodeModel)
734 .Case("tiny", llvm::CodeModel::Tiny)
735 .Case("small", llvm::CodeModel::Small)
736 .Case("kernel", llvm::CodeModel::Kernel)
737 .Case("medium", llvm::CodeModel::Medium)
738 .Case("large", llvm::CodeModel::Large)
739 .Default(~0u);
740 if (CM != ~0u) {
741 llvm::CodeModel::Model codeModel = static_cast<llvm::CodeModel::Model>(CM);
742 getModule().setCodeModel(codeModel);
743 }
744 }
745
746 if (CodeGenOpts.NoPLT)
747 getModule().setRtLibUseGOT();
748 if (CodeGenOpts.UnwindTables)
749 getModule().setUwtable();
750
751 switch (CodeGenOpts.getFramePointer()) {
752 case CodeGenOptions::FramePointerKind::None:
753 // 0 ("none") is the default.
754 break;
755 case CodeGenOptions::FramePointerKind::NonLeaf:
756 getModule().setFramePointer(llvm::FramePointerKind::NonLeaf);
757 break;
758 case CodeGenOptions::FramePointerKind::All:
759 getModule().setFramePointer(llvm::FramePointerKind::All);
760 break;
761 }
762
763 SimplifyPersonality();
764
765 if (getCodeGenOpts().EmitDeclMetadata)
766 EmitDeclMetadata();
767
768 if (getCodeGenOpts().EmitGcovArcs || getCodeGenOpts().EmitGcovNotes)
769 EmitCoverageFile();
770
771 if (CGDebugInfo *DI = getModuleDebugInfo())
772 DI->finalize();
773
774 if (getCodeGenOpts().EmitVersionIdentMetadata)
775 EmitVersionIdentMetadata();
776
777 if (!getCodeGenOpts().RecordCommandLine.empty())
778 EmitCommandLineMetadata();
779
780 if (!getCodeGenOpts().StackProtectorGuard.empty())
781 getModule().setStackProtectorGuard(getCodeGenOpts().StackProtectorGuard);
782 if (!getCodeGenOpts().StackProtectorGuardReg.empty())
783 getModule().setStackProtectorGuardReg(
784 getCodeGenOpts().StackProtectorGuardReg);
785 if (getCodeGenOpts().StackProtectorGuardOffset != INT_MAX2147483647)
786 getModule().setStackProtectorGuardOffset(
787 getCodeGenOpts().StackProtectorGuardOffset);
788 if (getCodeGenOpts().StackAlignment)
789 getModule().setOverrideStackAlignment(getCodeGenOpts().StackAlignment);
790 if (getCodeGenOpts().WarnStackSize != UINT_MAX(2147483647 *2U +1U))
791 getModule().setWarnStackSize(getCodeGenOpts().WarnStackSize);
792
793 getTargetCodeGenInfo().emitTargetMetadata(*this, MangledDeclNames);
794
795 EmitBackendOptionsMetadata(getCodeGenOpts());
796
797 // Set visibility from DLL storage class
798 // We do this at the end of LLVM IR generation; after any operation
799 // that might affect the DLL storage class or the visibility, and
800 // before anything that might act on these.
801 setVisibilityFromDLLStorageClass(LangOpts, getModule());
802}
803
804void CodeGenModule::EmitOpenCLMetadata() {
805 // SPIR v2.0 s2.13 - The OpenCL version used by the module is stored in the
806 // opencl.ocl.version named metadata node.
807 // C++ is backwards compatible with OpenCL v2.0.
808 // FIXME: We might need to add CXX version at some point too?
809 auto Version = LangOpts.OpenCLCPlusPlus ? 200 : LangOpts.OpenCLVersion;
810 llvm::Metadata *OCLVerElts[] = {
811 llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
812 Int32Ty, Version / 100)),
813 llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
814 Int32Ty, (Version % 100) / 10))};
815 llvm::NamedMDNode *OCLVerMD =
816 TheModule.getOrInsertNamedMetadata("opencl.ocl.version");
817 llvm::LLVMContext &Ctx = TheModule.getContext();
818 OCLVerMD->addOperand(llvm::MDNode::get(Ctx, OCLVerElts));
819}
820
821void CodeGenModule::EmitBackendOptionsMetadata(
822 const CodeGenOptions CodeGenOpts) {
823 switch (getTriple().getArch()) {
824 default:
825 break;
826 case llvm::Triple::riscv32:
827 case llvm::Triple::riscv64:
828 getModule().addModuleFlag(llvm::Module::Error, "SmallDataLimit",
829 CodeGenOpts.SmallDataLimit);
830 break;
831 }
832}
833
834void CodeGenModule::UpdateCompletedType(const TagDecl *TD) {
835 // Make sure that this type is translated.
836 Types.UpdateCompletedType(TD);
837}
838
839void CodeGenModule::RefreshTypeCacheForClass(const CXXRecordDecl *RD) {
840 // Make sure that this type is translated.
841 Types.RefreshTypeCacheForClass(RD);
842}
843
844llvm::MDNode *CodeGenModule::getTBAATypeInfo(QualType QTy) {
845 if (!TBAA)
846 return nullptr;
847 return TBAA->getTypeInfo(QTy);
848}
849
850TBAAAccessInfo CodeGenModule::getTBAAAccessInfo(QualType AccessType) {
851 if (!TBAA)
852 return TBAAAccessInfo();
853 if (getLangOpts().CUDAIsDevice) {
854 // As CUDA builtin surface/texture types are replaced, skip generating TBAA
855 // access info.
856 if (AccessType->isCUDADeviceBuiltinSurfaceType()) {
857 if (getTargetCodeGenInfo().getCUDADeviceBuiltinSurfaceDeviceType() !=
858 nullptr)
859 return TBAAAccessInfo();
860 } else if (AccessType->isCUDADeviceBuiltinTextureType()) {
861 if (getTargetCodeGenInfo().getCUDADeviceBuiltinTextureDeviceType() !=
862 nullptr)
863 return TBAAAccessInfo();
864 }
865 }
866 return TBAA->getAccessInfo(AccessType);
867}
868
869TBAAAccessInfo
870CodeGenModule::getTBAAVTablePtrAccessInfo(llvm::Type *VTablePtrType) {
871 if (!TBAA)
872 return TBAAAccessInfo();
873 return TBAA->getVTablePtrAccessInfo(VTablePtrType);
874}
875
876llvm::MDNode *CodeGenModule::getTBAAStructInfo(QualType QTy) {
877 if (!TBAA)
878 return nullptr;
879 return TBAA->getTBAAStructInfo(QTy);
880}
881
882llvm::MDNode *CodeGenModule::getTBAABaseTypeInfo(QualType QTy) {
883 if (!TBAA)
884 return nullptr;
885 return TBAA->getBaseTypeInfo(QTy);
886}
887
888llvm::MDNode *CodeGenModule::getTBAAAccessTagInfo(TBAAAccessInfo Info) {
889 if (!TBAA)
890 return nullptr;
891 return TBAA->getAccessTagInfo(Info);
892}
893
894TBAAAccessInfo CodeGenModule::mergeTBAAInfoForCast(TBAAAccessInfo SourceInfo,
895 TBAAAccessInfo TargetInfo) {
896 if (!TBAA)
897 return TBAAAccessInfo();
898 return TBAA->mergeTBAAInfoForCast(SourceInfo, TargetInfo);
899}
900
901TBAAAccessInfo
902CodeGenModule::mergeTBAAInfoForConditionalOperator(TBAAAccessInfo InfoA,
903 TBAAAccessInfo InfoB) {
904 if (!TBAA)
905 return TBAAAccessInfo();
906 return TBAA->mergeTBAAInfoForConditionalOperator(InfoA, InfoB);
907}
908
909TBAAAccessInfo
910CodeGenModule::mergeTBAAInfoForMemoryTransfer(TBAAAccessInfo DestInfo,
911 TBAAAccessInfo SrcInfo) {
912 if (!TBAA)
913 return TBAAAccessInfo();
914 return TBAA->mergeTBAAInfoForConditionalOperator(DestInfo, SrcInfo);
915}
916
917void CodeGenModule::DecorateInstructionWithTBAA(llvm::Instruction *Inst,
918 TBAAAccessInfo TBAAInfo) {
919 if (llvm::MDNode *Tag = getTBAAAccessTagInfo(TBAAInfo))
920 Inst->setMetadata(llvm::LLVMContext::MD_tbaa, Tag);
921}
922
923void CodeGenModule::DecorateInstructionWithInvariantGroup(
924 llvm::Instruction *I, const CXXRecordDecl *RD) {
925 I->setMetadata(llvm::LLVMContext::MD_invariant_group,
926 llvm::MDNode::get(getLLVMContext(), {}));
927}
928
929void CodeGenModule::Error(SourceLocation loc, StringRef message) {
930 unsigned diagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error, "%0");
931 getDiags().Report(Context.getFullLoc(loc), diagID) << message;
932}
933
934/// ErrorUnsupported - Print out an error that codegen doesn't support the
935/// specified stmt yet.
936void CodeGenModule::ErrorUnsupported(const Stmt *S, const char *Type) {
937 unsigned DiagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error,
938 "cannot compile this %0 yet");
939 std::string Msg = Type;
940 getDiags().Report(Context.getFullLoc(S->getBeginLoc()), DiagID)
941 << Msg << S->getSourceRange();
942}
943
944/// ErrorUnsupported - Print out an error that codegen doesn't support the
945/// specified decl yet.
946void CodeGenModule::ErrorUnsupported(const Decl *D, const char *Type) {
947 unsigned DiagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error,
948 "cannot compile this %0 yet");
949 std::string Msg = Type;
950 getDiags().Report(Context.getFullLoc(D->getLocation()), DiagID) << Msg;
951}
952
953llvm::ConstantInt *CodeGenModule::getSize(CharUnits size) {
954 return llvm::ConstantInt::get(SizeTy, size.getQuantity());
955}
956
957void CodeGenModule::setGlobalVisibility(llvm::GlobalValue *GV,
958 const NamedDecl *D) const {
959 if (GV->hasDLLImportStorageClass())
960 return;
961 // Internal definitions always have default visibility.
962 if (GV->hasLocalLinkage()) {
963 GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
964 return;
965 }
966 if (!D)
967 return;
968 // Set visibility for definitions, and for declarations if requested globally
969 // or set explicitly.
970 LinkageInfo LV = D->getLinkageAndVisibility();
971 if (LV.isVisibilityExplicit() || getLangOpts().SetVisibilityForExternDecls ||
972 !GV->isDeclarationForLinker())
973 GV->setVisibility(GetLLVMVisibility(LV.getVisibility()));
974}
975
976static bool shouldAssumeDSOLocal(const CodeGenModule &CGM,
977 llvm::GlobalValue *GV) {
978 if (GV->hasLocalLinkage())
979 return true;
980
981 if (!GV->hasDefaultVisibility() && !GV->hasExternalWeakLinkage())
982 return true;
983
984 // DLLImport explicitly marks the GV as external.
985 if (GV->hasDLLImportStorageClass())
986 return false;
987
988 const llvm::Triple &TT = CGM.getTriple();
989 if (TT.isWindowsGNUEnvironment()) {
990 // In MinGW, variables without DLLImport can still be automatically
991 // imported from a DLL by the linker; don't mark variables that
992 // potentially could come from another DLL as DSO local.
993
994 // With EmulatedTLS, TLS variables can be autoimported from other DLLs
995 // (and this actually happens in the public interface of libstdc++), so
996 // such variables can't be marked as DSO local. (Native TLS variables
997 // can't be dllimported at all, though.)
998 if (GV->isDeclarationForLinker() && isa<llvm::GlobalVariable>(GV) &&
999 (!GV->isThreadLocal() || CGM.getCodeGenOpts().EmulatedTLS))
1000 return false;
1001 }
1002
1003 // On COFF, don't mark 'extern_weak' symbols as DSO local. If these symbols
1004 // remain unresolved in the link, they can be resolved to zero, which is
1005 // outside the current DSO.
1006 if (TT.isOSBinFormatCOFF() && GV->hasExternalWeakLinkage())
1007 return false;
1008
1009 // Every other GV is local on COFF.
1010 // Make an exception for windows OS in the triple: Some firmware builds use
1011 // *-win32-macho triples. This (accidentally?) produced windows relocations
1012 // without GOT tables in older clang versions; Keep this behaviour.
1013 // FIXME: even thread local variables?
1014 if (TT.isOSBinFormatCOFF() || (TT.isOSWindows() && TT.isOSBinFormatMachO()))
1015 return true;
1016
1017 // Only handle COFF and ELF for now.
1018 if (!TT.isOSBinFormatELF())
1019 return false;
1020
1021 // If this is not an executable, don't assume anything is local.
1022 const auto &CGOpts = CGM.getCodeGenOpts();
1023 llvm::Reloc::Model RM = CGOpts.RelocationModel;
1024 const auto &LOpts = CGM.getLangOpts();
1025 if (RM != llvm::Reloc::Static && !LOpts.PIE) {
1026 // On ELF, if -fno-semantic-interposition is specified and the target
1027 // supports local aliases, there will be neither CC1
1028 // -fsemantic-interposition nor -fhalf-no-semantic-interposition. Set
1029 // dso_local on the function if using a local alias is preferable (can avoid
1030 // PLT indirection).
1031 if (!(isa<llvm::Function>(GV) && GV->canBenefitFromLocalAlias()))
1032 return false;
1033 return !(CGM.getLangOpts().SemanticInterposition ||
1034 CGM.getLangOpts().HalfNoSemanticInterposition);
1035 }
1036
1037 // A definition cannot be preempted from an executable.
1038 if (!GV->isDeclarationForLinker())
1039 return true;
1040
1041 // Most PIC code sequences that assume that a symbol is local cannot produce a
1042 // 0 if it turns out the symbol is undefined. While this is ABI and relocation
1043 // depended, it seems worth it to handle it here.
1044 if (RM == llvm::Reloc::PIC_ && GV->hasExternalWeakLinkage())
1045 return false;
1046
1047 // PowerPC64 prefers TOC indirection to avoid copy relocations.
1048 if (TT.isPPC64())
1049 return false;
1050
1051 if (CGOpts.DirectAccessExternalData) {
1052 // If -fdirect-access-external-data (default for -fno-pic), set dso_local
1053 // for non-thread-local variables. If the symbol is not defined in the
1054 // executable, a copy relocation will be needed at link time. dso_local is
1055 // excluded for thread-local variables because they generally don't support
1056 // copy relocations.
1057 if (auto *Var = dyn_cast<llvm::GlobalVariable>(GV))
1058 if (!Var->isThreadLocal())
1059 return true;
1060
1061 // -fno-pic sets dso_local on a function declaration to allow direct
1062 // accesses when taking its address (similar to a data symbol). If the
1063 // function is not defined in the executable, a canonical PLT entry will be
1064 // needed at link time. -fno-direct-access-external-data can avoid the
1065 // canonical PLT entry. We don't generalize this condition to -fpie/-fpic as
1066 // it could just cause trouble without providing perceptible benefits.
1067 if (isa<llvm::Function>(GV) && !CGOpts.NoPLT && RM == llvm::Reloc::Static)
1068 return true;
1069 }
1070
1071 // If we can use copy relocations we can assume it is local.
1072
1073 // Otherwise don't assume it is local.
1074 return false;
1075}
1076
1077void CodeGenModule::setDSOLocal(llvm::GlobalValue *GV) const {
1078 GV->setDSOLocal(shouldAssumeDSOLocal(*this, GV));
1079}
1080
1081void CodeGenModule::setDLLImportDLLExport(llvm::GlobalValue *GV,
1082 GlobalDecl GD) const {
1083 const auto *D = dyn_cast<NamedDecl>(GD.getDecl());
1084 // C++ destructors have a few C++ ABI specific special cases.
1085 if (const auto *Dtor = dyn_cast_or_null<CXXDestructorDecl>(D)) {
1086 getCXXABI().setCXXDestructorDLLStorage(GV, Dtor, GD.getDtorType());
1087 return;
1088 }
1089 setDLLImportDLLExport(GV, D);
1090}
1091
1092void CodeGenModule::setDLLImportDLLExport(llvm::GlobalValue *GV,
1093 const NamedDecl *D) const {
1094 if (D && D->isExternallyVisible()) {
1095 if (D->hasAttr<DLLImportAttr>())
1096 GV->setDLLStorageClass(llvm::GlobalVariable::DLLImportStorageClass);
1097 else if (D->hasAttr<DLLExportAttr>() && !GV->isDeclarationForLinker())
1098 GV->setDLLStorageClass(llvm::GlobalVariable::DLLExportStorageClass);
1099 }
1100}
1101
1102void CodeGenModule::setGVProperties(llvm::GlobalValue *GV,
1103 GlobalDecl GD) const {
1104 setDLLImportDLLExport(GV, GD);
1105 setGVPropertiesAux(GV, dyn_cast<NamedDecl>(GD.getDecl()));
1106}
1107
1108void CodeGenModule::setGVProperties(llvm::GlobalValue *GV,
1109 const NamedDecl *D) const {
1110 setDLLImportDLLExport(GV, D);
1111 setGVPropertiesAux(GV, D);
1112}
1113
1114void CodeGenModule::setGVPropertiesAux(llvm::GlobalValue *GV,
1115 const NamedDecl *D) const {
1116 setGlobalVisibility(GV, D);
1117 setDSOLocal(GV);
1118 GV->setPartition(CodeGenOpts.SymbolPartition);
1119}
1120
1121static llvm::GlobalVariable::ThreadLocalMode GetLLVMTLSModel(StringRef S) {
1122 return llvm::StringSwitch<llvm::GlobalVariable::ThreadLocalMode>(S)
1123 .Case("global-dynamic", llvm::GlobalVariable::GeneralDynamicTLSModel)
1124 .Case("local-dynamic", llvm::GlobalVariable::LocalDynamicTLSModel)
1125 .Case("initial-exec", llvm::GlobalVariable::InitialExecTLSModel)
1126 .Case("local-exec", llvm::GlobalVariable::LocalExecTLSModel);
1127}
1128
1129llvm::GlobalVariable::ThreadLocalMode
1130CodeGenModule::GetDefaultLLVMTLSModel() const {
1131 switch (CodeGenOpts.getDefaultTLSModel()) {
1132 case CodeGenOptions::GeneralDynamicTLSModel:
1133 return llvm::GlobalVariable::GeneralDynamicTLSModel;
1134 case CodeGenOptions::LocalDynamicTLSModel:
1135 return llvm::GlobalVariable::LocalDynamicTLSModel;
1136 case CodeGenOptions::InitialExecTLSModel:
1137 return llvm::GlobalVariable::InitialExecTLSModel;
1138 case CodeGenOptions::LocalExecTLSModel:
1139 return llvm::GlobalVariable::LocalExecTLSModel;
1140 }
1141 llvm_unreachable("Invalid TLS model!")::llvm::llvm_unreachable_internal("Invalid TLS model!", "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1141)
;
1142}
1143
1144void CodeGenModule::setTLSMode(llvm::GlobalValue *GV, const VarDecl &D) const {
1145 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1145, __extension__ __PRETTY_FUNCTION__))
;
1146
1147 llvm::GlobalValue::ThreadLocalMode TLM;
1148 TLM = GetDefaultLLVMTLSModel();
1149
1150 // Override the TLS model if it is explicitly specified.
1151 if (const TLSModelAttr *Attr = D.getAttr<TLSModelAttr>()) {
1152 TLM = GetLLVMTLSModel(Attr->getModel());
1153 }
1154
1155 GV->setThreadLocalMode(TLM);
1156}
1157
1158static std::string getCPUSpecificMangling(const CodeGenModule &CGM,
1159 StringRef Name) {
1160 const TargetInfo &Target = CGM.getTarget();
1161 return (Twine('.') + Twine(Target.CPUSpecificManglingCharacter(Name))).str();
1162}
1163
1164static void AppendCPUSpecificCPUDispatchMangling(const CodeGenModule &CGM,
1165 const CPUSpecificAttr *Attr,
1166 unsigned CPUIndex,
1167 raw_ostream &Out) {
1168 // cpu_specific gets the current name, dispatch gets the resolver if IFunc is
1169 // supported.
1170 if (Attr)
1171 Out << getCPUSpecificMangling(CGM, Attr->getCPUName(CPUIndex)->getName());
1172 else if (CGM.getTarget().supportsIFunc())
1173 Out << ".resolver";
1174}
1175
1176static void AppendTargetMangling(const CodeGenModule &CGM,
1177 const TargetAttr *Attr, raw_ostream &Out) {
1178 if (Attr->isDefaultVersion())
1179 return;
1180
1181 Out << '.';
1182 const TargetInfo &Target = CGM.getTarget();
1183 ParsedTargetAttr Info =
1184 Attr->parse([&Target](StringRef LHS, StringRef RHS) {
1185 // Multiversioning doesn't allow "no-${feature}", so we can
1186 // only have "+" prefixes here.
1187 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1188, __extension__ __PRETTY_FUNCTION__))
1188 "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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1188, __extension__ __PRETTY_FUNCTION__))
;
1189 return Target.multiVersionSortPriority(LHS.substr(1)) >
1190 Target.multiVersionSortPriority(RHS.substr(1));
1191 });
1192
1193 bool IsFirst = true;
1194
1195 if (!Info.Architecture.empty()) {
1196 IsFirst = false;
1197 Out << "arch_" << Info.Architecture;
1198 }
1199
1200 for (StringRef Feat : Info.Features) {
1201 if (!IsFirst)
1202 Out << '_';
1203 IsFirst = false;
1204 Out << Feat.substr(1);
1205 }
1206}
1207
1208// Returns true if GD is a function decl with internal linkage and
1209// needs a unique suffix after the mangled name.
1210static bool isUniqueInternalLinkageDecl(GlobalDecl GD,
1211 CodeGenModule &CGM) {
1212 const Decl *D = GD.getDecl();
1213 return !CGM.getModuleNameHash().empty() && isa<FunctionDecl>(D) &&
1214 (CGM.getFunctionLinkage(GD) == llvm::GlobalValue::InternalLinkage);
1215}
1216
1217static std::string getMangledNameImpl(CodeGenModule &CGM, GlobalDecl GD,
1218 const NamedDecl *ND,
1219 bool OmitMultiVersionMangling = false) {
1220 SmallString<256> Buffer;
1221 llvm::raw_svector_ostream Out(Buffer);
1222 MangleContext &MC = CGM.getCXXABI().getMangleContext();
1223 if (!CGM.getModuleNameHash().empty())
1224 MC.needsUniqueInternalLinkageNames();
1225 bool ShouldMangle = MC.shouldMangleDeclName(ND);
1226 if (ShouldMangle)
1227 MC.mangleName(GD.getWithDecl(ND), Out);
1228 else {
1229 IdentifierInfo *II = ND->getIdentifier();
1230 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1230, __extension__ __PRETTY_FUNCTION__))
;
1231 const auto *FD = dyn_cast<FunctionDecl>(ND);
1232
1233 if (FD &&
1234 FD->getType()->castAs<FunctionType>()->getCallConv() == CC_X86RegCall) {
1235 Out << "__regcall3__" << II->getName();
1236 } else if (FD && FD->hasAttr<CUDAGlobalAttr>() &&
1237 GD.getKernelReferenceKind() == KernelReferenceKind::Stub) {
1238 Out << "__device_stub__" << II->getName();
1239 } else {
1240 Out << II->getName();
1241 }
1242 }
1243
1244 // Check if the module name hash should be appended for internal linkage
1245 // symbols. This should come before multi-version target suffixes are
1246 // appended. This is to keep the name and module hash suffix of the
1247 // internal linkage function together. The unique suffix should only be
1248 // added when name mangling is done to make sure that the final name can
1249 // be properly demangled. For example, for C functions without prototypes,
1250 // name mangling is not done and the unique suffix should not be appeneded
1251 // then.
1252 if (ShouldMangle && isUniqueInternalLinkageDecl(GD, CGM)) {
1253 assert(CGM.getCodeGenOpts().UniqueInternalLinkageNames &&(static_cast <bool> (CGM.getCodeGenOpts().UniqueInternalLinkageNames
&& "Hash computed when not explicitly requested") ? void
(0) : __assert_fail ("CGM.getCodeGenOpts().UniqueInternalLinkageNames && \"Hash computed when not explicitly requested\""
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1254, __extension__ __PRETTY_FUNCTION__))
1254 "Hash computed when not explicitly requested")(static_cast <bool> (CGM.getCodeGenOpts().UniqueInternalLinkageNames
&& "Hash computed when not explicitly requested") ? void
(0) : __assert_fail ("CGM.getCodeGenOpts().UniqueInternalLinkageNames && \"Hash computed when not explicitly requested\""
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1254, __extension__ __PRETTY_FUNCTION__))
;
1255 Out << CGM.getModuleNameHash();
1256 }
1257
1258 if (const auto *FD = dyn_cast<FunctionDecl>(ND))
1259 if (FD->isMultiVersion() && !OmitMultiVersionMangling) {
1260 switch (FD->getMultiVersionKind()) {
1261 case MultiVersionKind::CPUDispatch:
1262 case MultiVersionKind::CPUSpecific:
1263 AppendCPUSpecificCPUDispatchMangling(CGM,
1264 FD->getAttr<CPUSpecificAttr>(),
1265 GD.getMultiVersionIndex(), Out);
1266 break;
1267 case MultiVersionKind::Target:
1268 AppendTargetMangling(CGM, FD->getAttr<TargetAttr>(), Out);
1269 break;
1270 case MultiVersionKind::None:
1271 llvm_unreachable("None multiversion type isn't valid here")::llvm::llvm_unreachable_internal("None multiversion type isn't valid here"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1271)
;
1272 }
1273 }
1274
1275 // Make unique name for device side static file-scope variable for HIP.
1276 if (CGM.getContext().shouldExternalizeStaticVar(ND) &&
1277 CGM.getLangOpts().GPURelocatableDeviceCode &&
1278 CGM.getLangOpts().CUDAIsDevice && !CGM.getLangOpts().CUID.empty())
1279 CGM.printPostfixForExternalizedStaticVar(Out);
1280 return std::string(Out.str());
1281}
1282
1283void CodeGenModule::UpdateMultiVersionNames(GlobalDecl GD,
1284 const FunctionDecl *FD) {
1285 if (!FD->isMultiVersion())
1286 return;
1287
1288 // Get the name of what this would be without the 'target' attribute. This
1289 // allows us to lookup the version that was emitted when this wasn't a
1290 // multiversion function.
1291 std::string NonTargetName =
1292 getMangledNameImpl(*this, GD, FD, /*OmitMultiVersionMangling=*/true);
1293 GlobalDecl OtherGD;
1294 if (lookupRepresentativeDecl(NonTargetName, OtherGD)) {
1295 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1299, __extension__ __PRETTY_FUNCTION__))
1296 .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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1299, __extension__ __PRETTY_FUNCTION__))
1297 ->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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1299, __extension__ __PRETTY_FUNCTION__))
1298 ->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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1299, __extension__ __PRETTY_FUNCTION__))
1299 "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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1299, __extension__ __PRETTY_FUNCTION__))
;
1300 // OtherFD is the version of this function that was mangled BEFORE
1301 // becoming a MultiVersion function. It potentially needs to be updated.
1302 const FunctionDecl *OtherFD = OtherGD.getCanonicalDecl()
1303 .getDecl()
1304 ->getAsFunction()
1305 ->getMostRecentDecl();
1306 std::string OtherName = getMangledNameImpl(*this, OtherGD, OtherFD);
1307 // This is so that if the initial version was already the 'default'
1308 // version, we don't try to update it.
1309 if (OtherName != NonTargetName) {
1310 // Remove instead of erase, since others may have stored the StringRef
1311 // to this.
1312 const auto ExistingRecord = Manglings.find(NonTargetName);
1313 if (ExistingRecord != std::end(Manglings))
1314 Manglings.remove(&(*ExistingRecord));
1315 auto Result = Manglings.insert(std::make_pair(OtherName, OtherGD));
1316 MangledDeclNames[OtherGD.getCanonicalDecl()] = Result.first->first();
1317 if (llvm::GlobalValue *Entry = GetGlobalValue(NonTargetName))
1318 Entry->setName(OtherName);
1319 }
1320 }
1321}
1322
1323StringRef CodeGenModule::getMangledName(GlobalDecl GD) {
1324 GlobalDecl CanonicalGD = GD.getCanonicalDecl();
1325
1326 // Some ABIs don't have constructor variants. Make sure that base and
1327 // complete constructors get mangled the same.
1328 if (const auto *CD = dyn_cast<CXXConstructorDecl>(CanonicalGD.getDecl())) {
1329 if (!getTarget().getCXXABI().hasConstructorVariants()) {
1330 CXXCtorType OrigCtorType = GD.getCtorType();
1331 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1331, __extension__ __PRETTY_FUNCTION__))
;
1332 if (OrigCtorType == Ctor_Base)
1333 CanonicalGD = GlobalDecl(CD, Ctor_Complete);
1334 }
1335 }
1336
1337 // In CUDA/HIP device compilation with -fgpu-rdc, the mangled name of a
1338 // static device variable depends on whether the variable is referenced by
1339 // a host or device host function. Therefore the mangled name cannot be
1340 // cached.
1341 if (!LangOpts.CUDAIsDevice ||
1342 !getContext().mayExternalizeStaticVar(GD.getDecl())) {
1343 auto FoundName = MangledDeclNames.find(CanonicalGD);
1344 if (FoundName != MangledDeclNames.end())
1345 return FoundName->second;
1346 }
1347
1348 // Keep the first result in the case of a mangling collision.
1349 const auto *ND = cast<NamedDecl>(GD.getDecl());
1350 std::string MangledName = getMangledNameImpl(*this, GD, ND);
1351
1352 // Ensure either we have different ABIs between host and device compilations,
1353 // says host compilation following MSVC ABI but device compilation follows
1354 // Itanium C++ ABI or, if they follow the same ABI, kernel names after
1355 // mangling should be the same after name stubbing. The later checking is
1356 // very important as the device kernel name being mangled in host-compilation
1357 // is used to resolve the device binaries to be executed. Inconsistent naming
1358 // result in undefined behavior. Even though we cannot check that naming
1359 // directly between host- and device-compilations, the host- and
1360 // device-mangling in host compilation could help catching certain ones.
1361 assert(!isa<FunctionDecl>(ND) || !ND->hasAttr<CUDAGlobalAttr>() ||(static_cast <bool> (!isa<FunctionDecl>(ND) || !ND
->hasAttr<CUDAGlobalAttr>() || getLangOpts().CUDAIsDevice
|| (getContext().getAuxTargetInfo() && (getContext()
.getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo
().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) ==
getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind
::Kernel), ND)) ? void (0) : __assert_fail ("!isa<FunctionDecl>(ND) || !ND->hasAttr<CUDAGlobalAttr>() || getLangOpts().CUDAIsDevice || (getContext().getAuxTargetInfo() && (getContext().getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) == getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind::Kernel), ND)"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1370, __extension__ __PRETTY_FUNCTION__))
1362 getLangOpts().CUDAIsDevice ||(static_cast <bool> (!isa<FunctionDecl>(ND) || !ND
->hasAttr<CUDAGlobalAttr>() || getLangOpts().CUDAIsDevice
|| (getContext().getAuxTargetInfo() && (getContext()
.getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo
().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) ==
getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind
::Kernel), ND)) ? void (0) : __assert_fail ("!isa<FunctionDecl>(ND) || !ND->hasAttr<CUDAGlobalAttr>() || getLangOpts().CUDAIsDevice || (getContext().getAuxTargetInfo() && (getContext().getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) == getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind::Kernel), ND)"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1370, __extension__ __PRETTY_FUNCTION__))
1363 (getContext().getAuxTargetInfo() &&(static_cast <bool> (!isa<FunctionDecl>(ND) || !ND
->hasAttr<CUDAGlobalAttr>() || getLangOpts().CUDAIsDevice
|| (getContext().getAuxTargetInfo() && (getContext()
.getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo
().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) ==
getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind
::Kernel), ND)) ? void (0) : __assert_fail ("!isa<FunctionDecl>(ND) || !ND->hasAttr<CUDAGlobalAttr>() || getLangOpts().CUDAIsDevice || (getContext().getAuxTargetInfo() && (getContext().getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) == getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind::Kernel), ND)"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1370, __extension__ __PRETTY_FUNCTION__))
1364 (getContext().getAuxTargetInfo()->getCXXABI() !=(static_cast <bool> (!isa<FunctionDecl>(ND) || !ND
->hasAttr<CUDAGlobalAttr>() || getLangOpts().CUDAIsDevice
|| (getContext().getAuxTargetInfo() && (getContext()
.getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo
().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) ==
getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind
::Kernel), ND)) ? void (0) : __assert_fail ("!isa<FunctionDecl>(ND) || !ND->hasAttr<CUDAGlobalAttr>() || getLangOpts().CUDAIsDevice || (getContext().getAuxTargetInfo() && (getContext().getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) == getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind::Kernel), ND)"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1370, __extension__ __PRETTY_FUNCTION__))
1365 getContext().getTargetInfo().getCXXABI())) ||(static_cast <bool> (!isa<FunctionDecl>(ND) || !ND
->hasAttr<CUDAGlobalAttr>() || getLangOpts().CUDAIsDevice
|| (getContext().getAuxTargetInfo() && (getContext()
.getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo
().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) ==
getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind
::Kernel), ND)) ? void (0) : __assert_fail ("!isa<FunctionDecl>(ND) || !ND->hasAttr<CUDAGlobalAttr>() || getLangOpts().CUDAIsDevice || (getContext().getAuxTargetInfo() && (getContext().getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) == getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind::Kernel), ND)"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1370, __extension__ __PRETTY_FUNCTION__))
1366 getCUDARuntime().getDeviceSideName(ND) ==(static_cast <bool> (!isa<FunctionDecl>(ND) || !ND
->hasAttr<CUDAGlobalAttr>() || getLangOpts().CUDAIsDevice
|| (getContext().getAuxTargetInfo() && (getContext()
.getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo
().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) ==
getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind
::Kernel), ND)) ? void (0) : __assert_fail ("!isa<FunctionDecl>(ND) || !ND->hasAttr<CUDAGlobalAttr>() || getLangOpts().CUDAIsDevice || (getContext().getAuxTargetInfo() && (getContext().getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) == getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind::Kernel), ND)"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1370, __extension__ __PRETTY_FUNCTION__))
1367 getMangledNameImpl((static_cast <bool> (!isa<FunctionDecl>(ND) || !ND
->hasAttr<CUDAGlobalAttr>() || getLangOpts().CUDAIsDevice
|| (getContext().getAuxTargetInfo() && (getContext()
.getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo
().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) ==
getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind
::Kernel), ND)) ? void (0) : __assert_fail ("!isa<FunctionDecl>(ND) || !ND->hasAttr<CUDAGlobalAttr>() || getLangOpts().CUDAIsDevice || (getContext().getAuxTargetInfo() && (getContext().getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) == getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind::Kernel), ND)"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1370, __extension__ __PRETTY_FUNCTION__))
1368 *this,(static_cast <bool> (!isa<FunctionDecl>(ND) || !ND
->hasAttr<CUDAGlobalAttr>() || getLangOpts().CUDAIsDevice
|| (getContext().getAuxTargetInfo() && (getContext()
.getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo
().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) ==
getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind
::Kernel), ND)) ? void (0) : __assert_fail ("!isa<FunctionDecl>(ND) || !ND->hasAttr<CUDAGlobalAttr>() || getLangOpts().CUDAIsDevice || (getContext().getAuxTargetInfo() && (getContext().getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) == getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind::Kernel), ND)"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1370, __extension__ __PRETTY_FUNCTION__))
1369 GD.getWithKernelReferenceKind(KernelReferenceKind::Kernel),(static_cast <bool> (!isa<FunctionDecl>(ND) || !ND
->hasAttr<CUDAGlobalAttr>() || getLangOpts().CUDAIsDevice
|| (getContext().getAuxTargetInfo() && (getContext()
.getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo
().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) ==
getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind
::Kernel), ND)) ? void (0) : __assert_fail ("!isa<FunctionDecl>(ND) || !ND->hasAttr<CUDAGlobalAttr>() || getLangOpts().CUDAIsDevice || (getContext().getAuxTargetInfo() && (getContext().getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) == getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind::Kernel), ND)"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1370, __extension__ __PRETTY_FUNCTION__))
1370 ND))(static_cast <bool> (!isa<FunctionDecl>(ND) || !ND
->hasAttr<CUDAGlobalAttr>() || getLangOpts().CUDAIsDevice
|| (getContext().getAuxTargetInfo() && (getContext()
.getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo
().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) ==
getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind
::Kernel), ND)) ? void (0) : __assert_fail ("!isa<FunctionDecl>(ND) || !ND->hasAttr<CUDAGlobalAttr>() || getLangOpts().CUDAIsDevice || (getContext().getAuxTargetInfo() && (getContext().getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) == getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind::Kernel), ND)"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1370, __extension__ __PRETTY_FUNCTION__))
;
1371
1372 auto Result = Manglings.insert(std::make_pair(MangledName, GD));
1373 return MangledDeclNames[CanonicalGD] = Result.first->first();
1374}
1375
1376StringRef CodeGenModule::getBlockMangledName(GlobalDecl GD,
1377 const BlockDecl *BD) {
1378 MangleContext &MangleCtx = getCXXABI().getMangleContext();
1379 const Decl *D = GD.getDecl();
1380
1381 SmallString<256> Buffer;
1382 llvm::raw_svector_ostream Out(Buffer);
1383 if (!D)
1384 MangleCtx.mangleGlobalBlock(BD,
1385 dyn_cast_or_null<VarDecl>(initializedGlobalDecl.getDecl()), Out);
1386 else if (const auto *CD = dyn_cast<CXXConstructorDecl>(D))
1387 MangleCtx.mangleCtorBlock(CD, GD.getCtorType(), BD, Out);
1388 else if (const auto *DD = dyn_cast<CXXDestructorDecl>(D))
1389 MangleCtx.mangleDtorBlock(DD, GD.getDtorType(), BD, Out);
1390 else
1391 MangleCtx.mangleBlock(cast<DeclContext>(D), BD, Out);
1392
1393 auto Result = Manglings.insert(std::make_pair(Out.str(), BD));
1394 return Result.first->first();
1395}
1396
1397llvm::GlobalValue *CodeGenModule::GetGlobalValue(StringRef Name) {
1398 return getModule().getNamedValue(Name);
1399}
1400
1401/// AddGlobalCtor - Add a function to the list that will be called before
1402/// main() runs.
1403void CodeGenModule::AddGlobalCtor(llvm::Function *Ctor, int Priority,
1404 llvm::Constant *AssociatedData) {
1405 // FIXME: Type coercion of void()* types.
1406 GlobalCtors.push_back(Structor(Priority, Ctor, AssociatedData));
1407}
1408
1409/// AddGlobalDtor - Add a function to the list that will be called
1410/// when the module is unloaded.
1411void CodeGenModule::AddGlobalDtor(llvm::Function *Dtor, int Priority,
1412 bool IsDtorAttrFunc) {
1413 if (CodeGenOpts.RegisterGlobalDtorsWithAtExit &&
1414 (!getContext().getTargetInfo().getTriple().isOSAIX() || IsDtorAttrFunc)) {
1415 DtorsUsingAtExit[Priority].push_back(Dtor);
1416 return;
1417 }
1418
1419 // FIXME: Type coercion of void()* types.
1420 GlobalDtors.push_back(Structor(Priority, Dtor, nullptr));
1421}
1422
1423void CodeGenModule::EmitCtorList(CtorList &Fns, const char *GlobalName) {
1424 if (Fns.empty()) return;
1425
1426 // Ctor function type is void()*.
1427 llvm::FunctionType* CtorFTy = llvm::FunctionType::get(VoidTy, false);
1428 llvm::Type *CtorPFTy = llvm::PointerType::get(CtorFTy,
1429 TheModule.getDataLayout().getProgramAddressSpace());
1430
1431 // Get the type of a ctor entry, { i32, void ()*, i8* }.
1432 llvm::StructType *CtorStructTy = llvm::StructType::get(
1433 Int32Ty, CtorPFTy, VoidPtrTy);
1434
1435 // Construct the constructor and destructor arrays.
1436 ConstantInitBuilder builder(*this);
1437 auto ctors = builder.beginArray(CtorStructTy);
1438 for (const auto &I : Fns) {
1439 auto ctor = ctors.beginStruct(CtorStructTy);
1440 ctor.addInt(Int32Ty, I.Priority);
1441 ctor.add(llvm::ConstantExpr::getBitCast(I.Initializer, CtorPFTy));
1442 if (I.AssociatedData)
1443 ctor.add(llvm::ConstantExpr::getBitCast(I.AssociatedData, VoidPtrTy));
1444 else
1445 ctor.addNullPointer(VoidPtrTy);
1446 ctor.finishAndAddTo(ctors);
1447 }
1448
1449 auto list =
1450 ctors.finishAndCreateGlobal(GlobalName, getPointerAlign(),
1451 /*constant*/ false,
1452 llvm::GlobalValue::AppendingLinkage);
1453
1454 // The LTO linker doesn't seem to like it when we set an alignment
1455 // on appending variables. Take it off as a workaround.
1456 list->setAlignment(llvm::None);
1457
1458 Fns.clear();
1459}
1460
1461llvm::GlobalValue::LinkageTypes
1462CodeGenModule::getFunctionLinkage(GlobalDecl GD) {
1463 const auto *D = cast<FunctionDecl>(GD.getDecl());
1464
1465 GVALinkage Linkage = getContext().GetGVALinkageForFunction(D);
1466
1467 if (const auto *Dtor = dyn_cast<CXXDestructorDecl>(D))
1468 return getCXXABI().getCXXDestructorLinkage(Linkage, Dtor, GD.getDtorType());
1469
1470 if (isa<CXXConstructorDecl>(D) &&
1471 cast<CXXConstructorDecl>(D)->isInheritingConstructor() &&
1472 Context.getTargetInfo().getCXXABI().isMicrosoft()) {
1473 // Our approach to inheriting constructors is fundamentally different from
1474 // that used by the MS ABI, so keep our inheriting constructor thunks
1475 // internal rather than trying to pick an unambiguous mangling for them.
1476 return llvm::GlobalValue::InternalLinkage;
1477 }
1478
1479 return getLLVMLinkageForDeclarator(D, Linkage, /*IsConstantVariable=*/false);
1480}
1481
1482llvm::ConstantInt *CodeGenModule::CreateCrossDsoCfiTypeId(llvm::Metadata *MD) {
1483 llvm::MDString *MDS = dyn_cast<llvm::MDString>(MD);
1484 if (!MDS) return nullptr;
1485
1486 return llvm::ConstantInt::get(Int64Ty, llvm::MD5Hash(MDS->getString()));
1487}
1488
1489void CodeGenModule::SetLLVMFunctionAttributes(GlobalDecl GD,
1490 const CGFunctionInfo &Info,
1491 llvm::Function *F, bool IsThunk) {
1492 unsigned CallingConv;
1493 llvm::AttributeList PAL;
1494 ConstructAttributeList(F->getName(), Info, GD, PAL, CallingConv,
1495 /*AttrOnCallSite=*/false, IsThunk);
1496 F->setAttributes(PAL);
1497 F->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv));
1498}
1499
1500static void removeImageAccessQualifier(std::string& TyName) {
1501 std::string ReadOnlyQual("__read_only");
1502 std::string::size_type ReadOnlyPos = TyName.find(ReadOnlyQual);
1503 if (ReadOnlyPos != std::string::npos)
1504 // "+ 1" for the space after access qualifier.
1505 TyName.erase(ReadOnlyPos, ReadOnlyQual.size() + 1);
1506 else {
1507 std::string WriteOnlyQual("__write_only");
1508 std::string::size_type WriteOnlyPos = TyName.find(WriteOnlyQual);
1509 if (WriteOnlyPos != std::string::npos)
1510 TyName.erase(WriteOnlyPos, WriteOnlyQual.size() + 1);
1511 else {
1512 std::string ReadWriteQual("__read_write");
1513 std::string::size_type ReadWritePos = TyName.find(ReadWriteQual);
1514 if (ReadWritePos != std::string::npos)
1515 TyName.erase(ReadWritePos, ReadWriteQual.size() + 1);
1516 }
1517 }
1518}
1519
1520// Returns the address space id that should be produced to the
1521// kernel_arg_addr_space metadata. This is always fixed to the ids
1522// as specified in the SPIR 2.0 specification in order to differentiate
1523// for example in clGetKernelArgInfo() implementation between the address
1524// spaces with targets without unique mapping to the OpenCL address spaces
1525// (basically all single AS CPUs).
1526static unsigned ArgInfoAddressSpace(LangAS AS) {
1527 switch (AS) {
1528 case LangAS::opencl_global:
1529 return 1;
1530 case LangAS::opencl_constant:
1531 return 2;
1532 case LangAS::opencl_local:
1533 return 3;
1534 case LangAS::opencl_generic:
1535 return 4; // Not in SPIR 2.0 specs.
1536 case LangAS::opencl_global_device:
1537 return 5;
1538 case LangAS::opencl_global_host:
1539 return 6;
1540 default:
1541 return 0; // Assume private.
1542 }
1543}
1544
1545void CodeGenModule::GenOpenCLArgMetadata(llvm::Function *Fn,
1546 const FunctionDecl *FD,
1547 CodeGenFunction *CGF) {
1548 assert(((FD && CGF) || (!FD && !CGF)) &&(static_cast <bool> (((FD && CGF) || (!FD &&
!CGF)) && "Incorrect use - FD and CGF should either be both null or not!"
) ? void (0) : __assert_fail ("((FD && CGF) || (!FD && !CGF)) && \"Incorrect use - FD and CGF should either be both null or not!\""
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1549, __extension__ __PRETTY_FUNCTION__))
1549 "Incorrect use - FD and CGF should either be both null or not!")(static_cast <bool> (((FD && CGF) || (!FD &&
!CGF)) && "Incorrect use - FD and CGF should either be both null or not!"
) ? void (0) : __assert_fail ("((FD && CGF) || (!FD && !CGF)) && \"Incorrect use - FD and CGF should either be both null or not!\""
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 1549, __extension__ __PRETTY_FUNCTION__))
;
1550 // Create MDNodes that represent the kernel arg metadata.
1551 // Each MDNode is a list in the form of "key", N number of values which is
1552 // the same number of values as their are kernel arguments.
1553
1554 const PrintingPolicy &Policy = Context.getPrintingPolicy();
1555
1556 // MDNode for the kernel argument address space qualifiers.
1557 SmallVector<llvm::Metadata *, 8> addressQuals;
1558
1559 // MDNode for the kernel argument access qualifiers (images only).
1560 SmallVector<llvm::Metadata *, 8> accessQuals;
1561
1562 // MDNode for the kernel argument type names.
1563 SmallVector<llvm::Metadata *, 8> argTypeNames;
1564
1565 // MDNode for the kernel argument base type names.
1566 SmallVector<llvm::Metadata *, 8> argBaseTypeNames;
1567
1568 // MDNode for the kernel argument type qualifiers.
1569 SmallVector<llvm::Metadata *, 8> argTypeQuals;
1570
1571 // MDNode for the kernel argument names.
1572 SmallVector<llvm::Metadata *, 8> argNames;
1573
1574 if (FD && CGF)
1575 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) {
1576 const ParmVarDecl *parm = FD->getParamDecl(i);
1577 QualType ty = parm->getType();
1578 std::string typeQuals;
1579
1580 // Get image and pipe access qualifier:
1581 if (ty->isImageType() || ty->isPipeType()) {
1582 const Decl *PDecl = parm;
1583 if (auto *TD = dyn_cast<TypedefType>(ty))
1584 PDecl = TD->getDecl();
1585 const OpenCLAccessAttr *A = PDecl->getAttr<OpenCLAccessAttr>();
1586 if (A && A->isWriteOnly())
1587 accessQuals.push_back(llvm::MDString::get(VMContext, "write_only"));
1588 else if (A && A->isReadWrite())
1589 accessQuals.push_back(llvm::MDString::get(VMContext, "read_write"));
1590 else
1591 accessQuals.push_back(llvm::MDString::get(VMContext, "read_only"));
1592 } else
1593 accessQuals.push_back(llvm::MDString::get(VMContext, "none"));
1594
1595 // Get argument name.
1596 argNames.push_back(llvm::MDString::get(VMContext, parm->getName()));
1597
1598 auto getTypeSpelling = [&](QualType Ty) {
1599 auto typeName = Ty.getUnqualifiedType().getAsString(Policy);
1600
1601 if (Ty.isCanonical()) {
1602 StringRef typeNameRef = typeName;
1603 // Turn "unsigned type" to "utype"
1604 if (typeNameRef.consume_front("unsigned "))
1605 return std::string("u") + typeNameRef.str();
1606 if (typeNameRef.consume_front("signed "))
1607 return typeNameRef.str();
1608 }
1609
1610 return typeName;
1611 };
1612
1613 if (ty->isPointerType()) {
1614 QualType pointeeTy = ty->getPointeeType();
1615
1616 // Get address qualifier.
1617 addressQuals.push_back(
1618 llvm::ConstantAsMetadata::get(CGF->Builder.getInt32(
1619 ArgInfoAddressSpace(pointeeTy.getAddressSpace()))));
1620
1621 // Get argument type name.
1622 std::string typeName = getTypeSpelling(pointeeTy) + "*";
1623 std::string baseTypeName =
1624 getTypeSpelling(pointeeTy.getCanonicalType()) + "*";
1625 argTypeNames.push_back(llvm::MDString::get(VMContext, typeName));
1626 argBaseTypeNames.push_back(
1627 llvm::MDString::get(VMContext, baseTypeName));
1628
1629 // Get argument type qualifiers:
1630 if (ty.isRestrictQualified())
1631 typeQuals = "restrict";
1632 if (pointeeTy.isConstQualified() ||
1633 (pointeeTy.getAddressSpace() == LangAS::opencl_constant))
1634 typeQuals += typeQuals.empty() ? "const" : " const";
1635 if (pointeeTy.isVolatileQualified())
1636 typeQuals += typeQuals.empty() ? "volatile" : " volatile";
1637 } else {
1638 uint32_t AddrSpc = 0;
1639 bool isPipe = ty->isPipeType();
1640 if (ty->isImageType() || isPipe)
1641 AddrSpc = ArgInfoAddressSpace(LangAS::opencl_global);
1642
1643 addressQuals.push_back(
1644 llvm::ConstantAsMetadata::get(CGF->Builder.getInt32(AddrSpc)));
1645
1646 // Get argument type name.
1647 ty = isPipe ? ty->castAs<PipeType>()->getElementType() : ty;
1648 std::string typeName = getTypeSpelling(ty);
1649 std::string baseTypeName = getTypeSpelling(ty.getCanonicalType());
1650
1651 // Remove access qualifiers on images
1652 // (as they are inseparable from type in clang implementation,
1653 // but OpenCL spec provides a special query to get access qualifier
1654 // via clGetKernelArgInfo with CL_KERNEL_ARG_ACCESS_QUALIFIER):
1655 if (ty->isImageType()) {
1656 removeImageAccessQualifier(typeName);
1657 removeImageAccessQualifier(baseTypeName);
1658 }
1659
1660 argTypeNames.push_back(llvm::MDString::get(VMContext, typeName));
1661 argBaseTypeNames.push_back(
1662 llvm::MDString::get(VMContext, baseTypeName));
1663
1664 if (isPipe)
1665 typeQuals = "pipe";
1666 }
1667 argTypeQuals.push_back(llvm::MDString::get(VMContext, typeQuals));
1668 }
1669
1670 Fn->setMetadata("kernel_arg_addr_space",
1671 llvm::MDNode::get(VMContext, addressQuals));
1672 Fn->setMetadata("kernel_arg_access_qual",
1673 llvm::MDNode::get(VMContext, accessQuals));
1674 Fn->setMetadata("kernel_arg_type",
1675 llvm::MDNode::get(VMContext, argTypeNames));
1676 Fn->setMetadata("kernel_arg_base_type",
1677 llvm::MDNode::get(VMContext, argBaseTypeNames));
1678 Fn->setMetadata("kernel_arg_type_qual",
1679 llvm::MDNode::get(VMContext, argTypeQuals));
1680 if (getCodeGenOpts().EmitOpenCLArgMetadata)
1681 Fn->setMetadata("kernel_arg_name",
1682 llvm::MDNode::get(VMContext, argNames));
1683}
1684
1685/// Determines whether the language options require us to model
1686/// unwind exceptions. We treat -fexceptions as mandating this
1687/// except under the fragile ObjC ABI with only ObjC exceptions
1688/// enabled. This means, for example, that C with -fexceptions
1689/// enables this.
1690static bool hasUnwindExceptions(const LangOptions &LangOpts) {
1691 // If exceptions are completely disabled, obviously this is false.
1692 if (!LangOpts.Exceptions) return false;
1693
1694 // If C++ exceptions are enabled, this is true.
1695 if (LangOpts.CXXExceptions) return true;
1696
1697 // If ObjC exceptions are enabled, this depends on the ABI.
1698 if (LangOpts.ObjCExceptions) {
1699 return LangOpts.ObjCRuntime.hasUnwindExceptions();
1700 }
1701
1702 return true;
1703}
1704
1705static bool requiresMemberFunctionPointerTypeMetadata(CodeGenModule &CGM,
1706 const CXXMethodDecl *MD) {
1707 // Check that the type metadata can ever actually be used by a call.
1708 if (!CGM.getCodeGenOpts().LTOUnit ||
1709 !CGM.HasHiddenLTOVisibility(MD->getParent()))
1710 return false;
1711
1712 // Only functions whose address can be taken with a member function pointer
1713 // need this sort of type metadata.
1714 return !MD->isStatic() && !MD->isVirtual() && !isa<CXXConstructorDecl>(MD) &&
1715 !isa<CXXDestructorDecl>(MD);
1716}
1717
1718std::vector<const CXXRecordDecl *>
1719CodeGenModule::getMostBaseClasses(const CXXRecordDecl *RD) {
1720 llvm::SetVector<const CXXRecordDecl *> MostBases;
1721
1722 std::function<void (const CXXRecordDecl *)> CollectMostBases;
1723 CollectMostBases = [&](const CXXRecordDecl *RD) {
1724 if (RD->getNumBases() == 0)
1725 MostBases.insert(RD);
1726 for (const CXXBaseSpecifier &B : RD->bases())
1727 CollectMostBases(B.getType()->getAsCXXRecordDecl());
1728 };
1729 CollectMostBases(RD);
1730 return MostBases.takeVector();
1731}
1732
1733void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D,
1734 llvm::Function *F) {
1735 llvm::AttrBuilder B;
1736
1737 if (CodeGenOpts.UnwindTables)
1738 B.addAttribute(llvm::Attribute::UWTable);
1739
1740 if (CodeGenOpts.StackClashProtector)
1741 B.addAttribute("probe-stack", "inline-asm");
1742
1743 if (!hasUnwindExceptions(LangOpts))
1744 B.addAttribute(llvm::Attribute::NoUnwind);
1745
1746 if (!D || !D->hasAttr<NoStackProtectorAttr>()) {
1747 if (LangOpts.getStackProtector() == LangOptions::SSPOn)
1748 B.addAttribute(llvm::Attribute::StackProtect);
1749 else if (LangOpts.getStackProtector() == LangOptions::SSPStrong)
1750 B.addAttribute(llvm::Attribute::StackProtectStrong);
1751 else if (LangOpts.getStackProtector() == LangOptions::SSPReq)
1752 B.addAttribute(llvm::Attribute::StackProtectReq);
1753 }
1754
1755 if (!D) {
1756 // If we don't have a declaration to control inlining, the function isn't
1757 // explicitly marked as alwaysinline for semantic reasons, and inlining is
1758 // disabled, mark the function as noinline.
1759 if (!F->hasFnAttribute(llvm::Attribute::AlwaysInline) &&
1760 CodeGenOpts.getInlining() == CodeGenOptions::OnlyAlwaysInlining)
1761 B.addAttribute(llvm::Attribute::NoInline);
1762
1763 F->addAttributes(llvm::AttributeList::FunctionIndex, B);
1764 return;
1765 }
1766
1767 // Track whether we need to add the optnone LLVM attribute,
1768 // starting with the default for this optimization level.
1769 bool ShouldAddOptNone =
1770 !CodeGenOpts.DisableO0ImplyOptNone && CodeGenOpts.OptimizationLevel == 0;
1771 // We can't add optnone in the following cases, it won't pass the verifier.
1772 ShouldAddOptNone &= !D->hasAttr<MinSizeAttr>();
1773 ShouldAddOptNone &= !D->hasAttr<AlwaysInlineAttr>();
1774
1775 // Add optnone, but do so only if the function isn't always_inline.
1776 if ((ShouldAddOptNone || D->hasAttr<OptimizeNoneAttr>()) &&
1777 !F->hasFnAttribute(llvm::Attribute::AlwaysInline)) {
1778 B.addAttribute(llvm::Attribute::OptimizeNone);
1779
1780 // OptimizeNone implies noinline; we should not be inlining such functions.
1781 B.addAttribute(llvm::Attribute::NoInline);
1782
1783 // We still need to handle naked functions even though optnone subsumes
1784 // much of their semantics.
1785 if (D->hasAttr<NakedAttr>())
1786 B.addAttribute(llvm::Attribute::Naked);
1787
1788 // OptimizeNone wins over OptimizeForSize and MinSize.
1789 F->removeFnAttr(llvm::Attribute::OptimizeForSize);
1790 F->removeFnAttr(llvm::Attribute::MinSize);
1791 } else if (D->hasAttr<NakedAttr>()) {
1792 // Naked implies noinline: we should not be inlining such functions.
1793 B.addAttribute(llvm::Attribute::Naked);
1794 B.addAttribute(llvm::Attribute::NoInline);
1795 } else if (D->hasAttr<NoDuplicateAttr>()) {
1796 B.addAttribute(llvm::Attribute::NoDuplicate);
1797 } else if (D->hasAttr<NoInlineAttr>() && !F->hasFnAttribute(llvm::Attribute::AlwaysInline)) {
1798 // Add noinline if the function isn't always_inline.
1799 B.addAttribute(llvm::Attribute::NoInline);
1800 } else if (D->hasAttr<AlwaysInlineAttr>() &&
1801 !F->hasFnAttribute(llvm::Attribute::NoInline)) {
1802 // (noinline wins over always_inline, and we can't specify both in IR)
1803 B.addAttribute(llvm::Attribute::AlwaysInline);
1804 } else if (CodeGenOpts.getInlining() == CodeGenOptions::OnlyAlwaysInlining) {
1805 // If we're not inlining, then force everything that isn't always_inline to
1806 // carry an explicit noinline attribute.
1807 if (!F->hasFnAttribute(llvm::Attribute::AlwaysInline))
1808 B.addAttribute(llvm::Attribute::NoInline);
1809 } else {
1810 // Otherwise, propagate the inline hint attribute and potentially use its
1811 // absence to mark things as noinline.
1812 if (auto *FD = dyn_cast<FunctionDecl>(D)) {
1813 // Search function and template pattern redeclarations for inline.
1814 auto CheckForInline = [](const FunctionDecl *FD) {
1815 auto CheckRedeclForInline = [](const FunctionDecl *Redecl) {
1816 return Redecl->isInlineSpecified();
1817 };
1818 if (any_of(FD->redecls(), CheckRedeclForInline))
1819 return true;
1820 const FunctionDecl *Pattern = FD->getTemplateInstantiationPattern();
1821 if (!Pattern)
1822 return false;
1823 return any_of(Pattern->redecls(), CheckRedeclForInline);
1824 };
1825 if (CheckForInline(FD)) {
1826 B.addAttribute(llvm::Attribute::InlineHint);
1827 } else if (CodeGenOpts.getInlining() ==
1828 CodeGenOptions::OnlyHintInlining &&
1829 !FD->isInlined() &&
1830 !F->hasFnAttribute(llvm::Attribute::AlwaysInline)) {
1831 B.addAttribute(llvm::Attribute::NoInline);
1832 }
1833 }
1834 }
1835
1836 // Add other optimization related attributes if we are optimizing this
1837 // function.
1838 if (!D->hasAttr<OptimizeNoneAttr>()) {
1839 if (D->hasAttr<ColdAttr>()) {
1840 if (!ShouldAddOptNone)
1841 B.addAttribute(llvm::Attribute::OptimizeForSize);
1842 B.addAttribute(llvm::Attribute::Cold);
1843 }
1844 if (D->hasAttr<HotAttr>())
1845 B.addAttribute(llvm::Attribute::Hot);
1846 if (D->hasAttr<MinSizeAttr>())
1847 B.addAttribute(llvm::Attribute::MinSize);
1848 }
1849
1850 F->addAttributes(llvm::AttributeList::FunctionIndex, B);
1851
1852 unsigned alignment = D->getMaxAlignment() / Context.getCharWidth();
1853 if (alignment)
1854 F->setAlignment(llvm::Align(alignment));
1855
1856 if (!D->hasAttr<AlignedAttr>())
1857 if (LangOpts.FunctionAlignment)
1858 F->setAlignment(llvm::Align(1ull << LangOpts.FunctionAlignment));
1859
1860 // Some C++ ABIs require 2-byte alignment for member functions, in order to
1861 // reserve a bit for differentiating between virtual and non-virtual member
1862 // functions. If the current target's C++ ABI requires this and this is a
1863 // member function, set its alignment accordingly.
1864 if (getTarget().getCXXABI().areMemberFunctionsAligned()) {
1865 if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D))
1866 F->setAlignment(llvm::Align(2));
1867 }
1868
1869 // In the cross-dso CFI mode with canonical jump tables, we want !type
1870 // attributes on definitions only.
1871 if (CodeGenOpts.SanitizeCfiCrossDso &&
1872 CodeGenOpts.SanitizeCfiCanonicalJumpTables) {
1873 if (auto *FD = dyn_cast<FunctionDecl>(D)) {
1874 // Skip available_externally functions. They won't be codegen'ed in the
1875 // current module anyway.
1876 if (getContext().GetGVALinkageForFunction(FD) != GVA_AvailableExternally)
1877 CreateFunctionTypeMetadataForIcall(FD, F);
1878 }
1879 }
1880
1881 // Emit type metadata on member functions for member function pointer checks.
1882 // These are only ever necessary on definitions; we're guaranteed that the
1883 // definition will be present in the LTO unit as a result of LTO visibility.
1884 auto *MD = dyn_cast<CXXMethodDecl>(D);
1885 if (MD && requiresMemberFunctionPointerTypeMetadata(*this, MD)) {
1886 for (const CXXRecordDecl *Base : getMostBaseClasses(MD->getParent())) {
1887 llvm::Metadata *Id =
1888 CreateMetadataIdentifierForType(Context.getMemberPointerType(
1889 MD->getType(), Context.getRecordType(Base).getTypePtr()));
1890 F->addTypeMetadata(0, Id);
1891 }
1892 }
1893}
1894
1895void CodeGenModule::setLLVMFunctionFEnvAttributes(const FunctionDecl *D,
1896 llvm::Function *F) {
1897 if (D->hasAttr<StrictFPAttr>()) {
1898 llvm::AttrBuilder FuncAttrs;
1899 FuncAttrs.addAttribute("strictfp");
1900 F->addAttributes(llvm::AttributeList::FunctionIndex, FuncAttrs);
1901 }
1902}
1903
1904void CodeGenModule::SetCommonAttributes(GlobalDecl GD, llvm::GlobalValue *GV) {
1905 const Decl *D = GD.getDecl();
1906 if (dyn_cast_or_null<NamedDecl>(D))
1907 setGVProperties(GV, GD);
1908 else
1909 GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
1910
1911 if (D && D->hasAttr<UsedAttr>())
1912 addUsedOrCompilerUsedGlobal(GV);
1913
1914 if (CodeGenOpts.KeepStaticConsts && D && isa<VarDecl>(D)) {
1915 const auto *VD = cast<VarDecl>(D);
1916 if (VD->getType().isConstQualified() &&
1917 VD->getStorageDuration() == SD_Static)
1918 addUsedOrCompilerUsedGlobal(GV);
1919 }
1920}
1921
1922bool CodeGenModule::GetCPUAndFeaturesAttributes(GlobalDecl GD,
1923 llvm::AttrBuilder &Attrs) {
1924 // Add target-cpu and target-features attributes to functions. If
1925 // we have a decl for the function and it has a target attribute then
1926 // parse that and add it to the feature set.
1927 StringRef TargetCPU = getTarget().getTargetOpts().CPU;
1928 StringRef TuneCPU = getTarget().getTargetOpts().TuneCPU;
1929 std::vector<std::string> Features;
1930 const auto *FD = dyn_cast_or_null<FunctionDecl>(GD.getDecl());
1931 FD = FD ? FD->getMostRecentDecl() : FD;
1932 const auto *TD = FD ? FD->getAttr<TargetAttr>() : nullptr;
1933 const auto *SD = FD ? FD->getAttr<CPUSpecificAttr>() : nullptr;
1934 bool AddedAttr = false;
1935 if (TD || SD) {
1936 llvm::StringMap<bool> FeatureMap;
1937 getContext().getFunctionFeatureMap(FeatureMap, GD);
1938
1939 // Produce the canonical string for this set of features.
1940 for (const llvm::StringMap<bool>::value_type &Entry : FeatureMap)
1941 Features.push_back((Entry.getValue() ? "+" : "-") + Entry.getKey().str());
1942
1943 // Now add the target-cpu and target-features to the function.
1944 // While we populated the feature map above, we still need to
1945 // get and parse the target attribute so we can get the cpu for
1946 // the function.
1947 if (TD) {
1948 ParsedTargetAttr ParsedAttr = TD->parse();
1949 if (!ParsedAttr.Architecture.empty() &&
1950 getTarget().isValidCPUName(ParsedAttr.Architecture)) {
1951 TargetCPU = ParsedAttr.Architecture;
1952 TuneCPU = ""; // Clear the tune CPU.
1953 }
1954 if (!ParsedAttr.Tune.empty() &&
1955 getTarget().isValidCPUName(ParsedAttr.Tune))
1956 TuneCPU = ParsedAttr.Tune;
1957 }
1958 } else {
1959 // Otherwise just add the existing target cpu and target features to the
1960 // function.
1961 Features = getTarget().getTargetOpts().Features;
1962 }
1963
1964 if (!TargetCPU.empty()) {
1965 Attrs.addAttribute("target-cpu", TargetCPU);
1966 AddedAttr = true;
1967 }
1968 if (!TuneCPU.empty()) {
1969 Attrs.addAttribute("tune-cpu", TuneCPU);
1970 AddedAttr = true;
1971 }
1972 if (!Features.empty()) {
1973 llvm::sort(Features);
1974 Attrs.addAttribute("target-features", llvm::join(Features, ","));
1975 AddedAttr = true;
1976 }
1977
1978 return AddedAttr;
1979}
1980
1981void CodeGenModule::setNonAliasAttributes(GlobalDecl GD,
1982 llvm::GlobalObject *GO) {
1983 const Decl *D = GD.getDecl();
1984 SetCommonAttributes(GD, GO);
1985
1986 if (D) {
1987 if (auto *GV = dyn_cast<llvm::GlobalVariable>(GO)) {
1988 if (D->hasAttr<RetainAttr>())
1989 addUsedGlobal(GV);
1990 if (auto *SA = D->getAttr<PragmaClangBSSSectionAttr>())
1991 GV->addAttribute("bss-section", SA->getName());
1992 if (auto *SA = D->getAttr<PragmaClangDataSectionAttr>())
1993 GV->addAttribute("data-section", SA->getName());
1994 if (auto *SA = D->getAttr<PragmaClangRodataSectionAttr>())
1995 GV->addAttribute("rodata-section", SA->getName());
1996 if (auto *SA = D->getAttr<PragmaClangRelroSectionAttr>())
1997 GV->addAttribute("relro-section", SA->getName());
1998 }
1999
2000 if (auto *F = dyn_cast<llvm::Function>(GO)) {
2001 if (D->hasAttr<RetainAttr>())
2002 addUsedGlobal(F);
2003 if (auto *SA = D->getAttr<PragmaClangTextSectionAttr>())
2004 if (!D->getAttr<SectionAttr>())
2005 F->addFnAttr("implicit-section-name", SA->getName());
2006
2007 llvm::AttrBuilder Attrs;
2008 if (GetCPUAndFeaturesAttributes(GD, Attrs)) {
2009 // We know that GetCPUAndFeaturesAttributes will always have the
2010 // newest set, since it has the newest possible FunctionDecl, so the
2011 // new ones should replace the old.
2012 llvm::AttrBuilder RemoveAttrs;
2013 RemoveAttrs.addAttribute("target-cpu");
2014 RemoveAttrs.addAttribute("target-features");
2015 RemoveAttrs.addAttribute("tune-cpu");
2016 F->removeAttributes(llvm::AttributeList::FunctionIndex, RemoveAttrs);
2017 F->addAttributes(llvm::AttributeList::FunctionIndex, Attrs);
2018 }
2019 }
2020
2021 if (const auto *CSA = D->getAttr<CodeSegAttr>())
2022 GO->setSection(CSA->getName());
2023 else if (const auto *SA = D->getAttr<SectionAttr>())
2024 GO->setSection(SA->getName());
2025 }
2026
2027 getTargetCodeGenInfo().setTargetAttributes(D, GO, *this);
2028}
2029
2030void CodeGenModule::SetInternalFunctionAttributes(GlobalDecl GD,
2031 llvm::Function *F,
2032 const CGFunctionInfo &FI) {
2033 const Decl *D = GD.getDecl();
2034 SetLLVMFunctionAttributes(GD, FI, F, /*IsThunk=*/false);
2035 SetLLVMFunctionAttributesForDefinition(D, F);
2036
2037 F->setLinkage(llvm::Function::InternalLinkage);
2038
2039 setNonAliasAttributes(GD, F);
2040}
2041
2042static void setLinkageForGV(llvm::GlobalValue *GV, const NamedDecl *ND) {
2043 // Set linkage and visibility in case we never see a definition.
2044 LinkageInfo LV = ND->getLinkageAndVisibility();
2045 // Don't set internal linkage on declarations.
2046 // "extern_weak" is overloaded in LLVM; we probably should have
2047 // separate linkage types for this.
2048 if (isExternallyVisible(LV.getLinkage()) &&
2049 (ND->hasAttr<WeakAttr>() || ND->isWeakImported()))
2050 GV->setLinkage(llvm::GlobalValue::ExternalWeakLinkage);
2051}
2052
2053void CodeGenModule::CreateFunctionTypeMetadataForIcall(const FunctionDecl *FD,
2054 llvm::Function *F) {
2055 // Only if we are checking indirect calls.
2056 if (!LangOpts.Sanitize.has(SanitizerKind::CFIICall))
2057 return;
2058
2059 // Non-static class methods are handled via vtable or member function pointer
2060 // checks elsewhere.
2061 if (isa<CXXMethodDecl>(FD) && !cast<CXXMethodDecl>(FD)->isStatic())
2062 return;
2063
2064 llvm::Metadata *MD = CreateMetadataIdentifierForType(FD->getType());
2065 F->addTypeMetadata(0, MD);
2066 F->addTypeMetadata(0, CreateMetadataIdentifierGeneralized(FD->getType()));
2067
2068 // Emit a hash-based bit set entry for cross-DSO calls.
2069 if (CodeGenOpts.SanitizeCfiCrossDso)
2070 if (auto CrossDsoTypeId = CreateCrossDsoCfiTypeId(MD))
2071 F->addTypeMetadata(0, llvm::ConstantAsMetadata::get(CrossDsoTypeId));
2072}
2073
2074void CodeGenModule::SetFunctionAttributes(GlobalDecl GD, llvm::Function *F,
2075 bool IsIncompleteFunction,
2076 bool IsThunk) {
2077
2078 if (llvm::Intrinsic::ID IID = F->getIntrinsicID()) {
2079 // If this is an intrinsic function, set the function's attributes
2080 // to the intrinsic's attributes.
2081 F->setAttributes(llvm::Intrinsic::getAttributes(getLLVMContext(), IID));
2082 return;
2083 }
2084
2085 const auto *FD = cast<FunctionDecl>(GD.getDecl());
2086
2087 if (!IsIncompleteFunction)
2088 SetLLVMFunctionAttributes(GD, getTypes().arrangeGlobalDeclaration(GD), F,
2089 IsThunk);
2090
2091 // Add the Returned attribute for "this", except for iOS 5 and earlier
2092 // where substantial code, including the libstdc++ dylib, was compiled with
2093 // GCC and does not actually return "this".
2094 if (!IsThunk && getCXXABI().HasThisReturn(GD) &&
2095 !(getTriple().isiOS() && getTriple().isOSVersionLT(6))) {
2096 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2099, __extension__ __PRETTY_FUNCTION__))
2097 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2099, __extension__ __PRETTY_FUNCTION__))
2098 ->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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2099, __extension__ __PRETTY_FUNCTION__))
2099 "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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2099, __extension__ __PRETTY_FUNCTION__))
;
2100 F->addAttribute(1, llvm::Attribute::Returned);
2101 }
2102
2103 // Only a few attributes are set on declarations; these may later be
2104 // overridden by a definition.
2105
2106 setLinkageForGV(F, FD);
2107 setGVProperties(F, FD);
2108
2109 // Setup target-specific attributes.
2110 if (!IsIncompleteFunction && F->isDeclaration())
2111 getTargetCodeGenInfo().setTargetAttributes(FD, F, *this);
2112
2113 if (const auto *CSA = FD->getAttr<CodeSegAttr>())
2114 F->setSection(CSA->getName());
2115 else if (const auto *SA = FD->getAttr<SectionAttr>())
2116 F->setSection(SA->getName());
2117
2118 // If we plan on emitting this inline builtin, we can't treat it as a builtin.
2119 if (FD->isInlineBuiltinDeclaration()) {
2120 const FunctionDecl *FDBody;
2121 bool HasBody = FD->hasBody(FDBody);
2122 (void)HasBody;
2123 assert(HasBody && "Inline builtin declarations should always have an "(static_cast <bool> (HasBody && "Inline builtin declarations should always have an "
"available body!") ? void (0) : __assert_fail ("HasBody && \"Inline builtin declarations should always have an \" \"available body!\""
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2124, __extension__ __PRETTY_FUNCTION__))
2124 "available body!")(static_cast <bool> (HasBody && "Inline builtin declarations should always have an "
"available body!") ? void (0) : __assert_fail ("HasBody && \"Inline builtin declarations should always have an \" \"available body!\""
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2124, __extension__ __PRETTY_FUNCTION__))
;
2125 if (shouldEmitFunction(FDBody))
2126 F->addAttribute(llvm::AttributeList::FunctionIndex,
2127 llvm::Attribute::NoBuiltin);
2128 }
2129
2130 if (FD->isReplaceableGlobalAllocationFunction()) {
2131 // A replaceable global allocation function does not act like a builtin by
2132 // default, only if it is invoked by a new-expression or delete-expression.
2133 F->addAttribute(llvm::AttributeList::FunctionIndex,
2134 llvm::Attribute::NoBuiltin);
2135 }
2136
2137 if (isa<CXXConstructorDecl>(FD) || isa<CXXDestructorDecl>(FD))
2138 F->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
2139 else if (const auto *MD = dyn_cast<CXXMethodDecl>(FD))
2140 if (MD->isVirtual())
2141 F->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
2142
2143 // Don't emit entries for function declarations in the cross-DSO mode. This
2144 // is handled with better precision by the receiving DSO. But if jump tables
2145 // are non-canonical then we need type metadata in order to produce the local
2146 // jump table.
2147 if (!CodeGenOpts.SanitizeCfiCrossDso ||
2148 !CodeGenOpts.SanitizeCfiCanonicalJumpTables)
2149 CreateFunctionTypeMetadataForIcall(FD, F);
2150
2151 if (getLangOpts().OpenMP && FD->hasAttr<OMPDeclareSimdDeclAttr>())
2152 getOpenMPRuntime().emitDeclareSimdFunction(FD, F);
2153
2154 if (const auto *CB = FD->getAttr<CallbackAttr>()) {
2155 // Annotate the callback behavior as metadata:
2156 // - The callback callee (as argument number).
2157 // - The callback payloads (as argument numbers).
2158 llvm::LLVMContext &Ctx = F->getContext();
2159 llvm::MDBuilder MDB(Ctx);
2160
2161 // The payload indices are all but the first one in the encoding. The first
2162 // identifies the callback callee.
2163 int CalleeIdx = *CB->encoding_begin();
2164 ArrayRef<int> PayloadIndices(CB->encoding_begin() + 1, CB->encoding_end());
2165 F->addMetadata(llvm::LLVMContext::MD_callback,
2166 *llvm::MDNode::get(Ctx, {MDB.createCallbackEncoding(
2167 CalleeIdx, PayloadIndices,
2168 /* VarArgsArePassed */ false)}));
2169 }
2170}
2171
2172void CodeGenModule::addUsedGlobal(llvm::GlobalValue *GV) {
2173 assert((isa<llvm::Function>(GV) || !GV->isDeclaration()) &&(static_cast <bool> ((isa<llvm::Function>(GV) || !
GV->isDeclaration()) && "Only globals with definition can force usage."
) ? void (0) : __assert_fail ("(isa<llvm::Function>(GV) || !GV->isDeclaration()) && \"Only globals with definition can force usage.\""
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2174, __extension__ __PRETTY_FUNCTION__))
2174 "Only globals with definition can force usage.")(static_cast <bool> ((isa<llvm::Function>(GV) || !
GV->isDeclaration()) && "Only globals with definition can force usage."
) ? void (0) : __assert_fail ("(isa<llvm::Function>(GV) || !GV->isDeclaration()) && \"Only globals with definition can force usage.\""
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2174, __extension__ __PRETTY_FUNCTION__))
;
2175 LLVMUsed.emplace_back(GV);
2176}
2177
2178void CodeGenModule::addCompilerUsedGlobal(llvm::GlobalValue *GV) {
2179 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2180, __extension__ __PRETTY_FUNCTION__))
2180 "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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2180, __extension__ __PRETTY_FUNCTION__))
;
2181 LLVMCompilerUsed.emplace_back(GV);
2182}
2183
2184void CodeGenModule::addUsedOrCompilerUsedGlobal(llvm::GlobalValue *GV) {
2185 assert((isa<llvm::Function>(GV) || !GV->isDeclaration()) &&(static_cast <bool> ((isa<llvm::Function>(GV) || !
GV->isDeclaration()) && "Only globals with definition can force usage."
) ? void (0) : __assert_fail ("(isa<llvm::Function>(GV) || !GV->isDeclaration()) && \"Only globals with definition can force usage.\""
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2186, __extension__ __PRETTY_FUNCTION__))
2186 "Only globals with definition can force usage.")(static_cast <bool> ((isa<llvm::Function>(GV) || !
GV->isDeclaration()) && "Only globals with definition can force usage."
) ? void (0) : __assert_fail ("(isa<llvm::Function>(GV) || !GV->isDeclaration()) && \"Only globals with definition can force usage.\""
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2186, __extension__ __PRETTY_FUNCTION__))
;
2187 if (getTriple().isOSBinFormatELF())
2188 LLVMCompilerUsed.emplace_back(GV);
2189 else
2190 LLVMUsed.emplace_back(GV);
2191}
2192
2193static void emitUsed(CodeGenModule &CGM, StringRef Name,
2194 std::vector<llvm::WeakTrackingVH> &List) {
2195 // Don't create llvm.used if there is no need.
2196 if (List.empty())
2197 return;
2198
2199 // Convert List to what ConstantArray needs.
2200 SmallVector<llvm::Constant*, 8> UsedArray;
2201 UsedArray.resize(List.size());
2202 for (unsigned i = 0, e = List.size(); i != e; ++i) {
2203 UsedArray[i] =
2204 llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(
2205 cast<llvm::Constant>(&*List[i]), CGM.Int8PtrTy);
2206 }
2207
2208 if (UsedArray.empty())
2209 return;
2210 llvm::ArrayType *ATy = llvm::ArrayType::get(CGM.Int8PtrTy, UsedArray.size());
2211
2212 auto *GV = new llvm::GlobalVariable(
2213 CGM.getModule(), ATy, false, llvm::GlobalValue::AppendingLinkage,
2214 llvm::ConstantArray::get(ATy, UsedArray), Name);
2215
2216 GV->setSection("llvm.metadata");
2217}
2218
2219void CodeGenModule::emitLLVMUsed() {
2220 emitUsed(*this, "llvm.used", LLVMUsed);
2221 emitUsed(*this, "llvm.compiler.used", LLVMCompilerUsed);
2222}
2223
2224void CodeGenModule::AppendLinkerOptions(StringRef Opts) {
2225 auto *MDOpts = llvm::MDString::get(getLLVMContext(), Opts);
2226 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
2227}
2228
2229void CodeGenModule::AddDetectMismatch(StringRef Name, StringRef Value) {
2230 llvm::SmallString<32> Opt;
2231 getTargetCodeGenInfo().getDetectMismatchOption(Name, Value, Opt);
2232 if (Opt.empty())
2233 return;
2234 auto *MDOpts = llvm::MDString::get(getLLVMContext(), Opt);
2235 LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts));
2236}
2237
2238void CodeGenModule::AddDependentLib(StringRef Lib) {
2239 auto &C = getLLVMContext();
2240 if (getTarget().getTriple().isOSBinFormatELF()) {
2241 ELFDependentLibraries.push_back(
2242 llvm::MDNode::get(C, llvm::MDString::get(C, Lib)));
2243 return;
2244 }
2245
2246 llvm::SmallString<24> Opt;
2247 getTargetCodeGenInfo().getDependentLibraryOption(Lib, Opt);
2248 auto *MDOpts = llvm::MDString::get(getLLVMContext(), Opt);
2249 LinkerOptionsMetadata.push_back(llvm::MDNode::get(C, MDOpts));
2250}
2251
2252/// Add link options implied by the given module, including modules
2253/// it depends on, using a postorder walk.
2254static void addLinkOptionsPostorder(CodeGenModule &CGM, Module *Mod,
2255 SmallVectorImpl<llvm::MDNode *> &Metadata,
2256 llvm::SmallPtrSet<Module *, 16> &Visited) {
2257 // Import this module's parent.
2258 if (Mod->Parent && Visited.insert(Mod->Parent).second) {
2259 addLinkOptionsPostorder(CGM, Mod->Parent, Metadata, Visited);
2260 }
2261
2262 // Import this module's dependencies.
2263 for (unsigned I = Mod->Imports.size(); I > 0; --I) {
2264 if (Visited.insert(Mod->Imports[I - 1]).second)
2265 addLinkOptionsPostorder(CGM, Mod->Imports[I-1], Metadata, Visited);
2266 }
2267
2268 // Add linker options to link against the libraries/frameworks
2269 // described by this module.
2270 llvm::LLVMContext &Context = CGM.getLLVMContext();
2271 bool IsELF = CGM.getTarget().getTriple().isOSBinFormatELF();
2272
2273 // For modules that use export_as for linking, use that module
2274 // name instead.
2275 if (Mod->UseExportAsModuleLinkName)
2276 return;
2277
2278 for (unsigned I = Mod->LinkLibraries.size(); I > 0; --I) {
2279 // Link against a framework. Frameworks are currently Darwin only, so we
2280 // don't to ask TargetCodeGenInfo for the spelling of the linker option.
2281 if (Mod->LinkLibraries[I-1].IsFramework) {
2282 llvm::Metadata *Args[2] = {
2283 llvm::MDString::get(Context, "-framework"),
2284 llvm::MDString::get(Context, Mod->LinkLibraries[I - 1].Library)};
2285
2286 Metadata.push_back(llvm::MDNode::get(Context, Args));
2287 continue;
2288 }
2289
2290 // Link against a library.
2291 if (IsELF) {
2292 llvm::Metadata *Args[2] = {
2293 llvm::MDString::get(Context, "lib"),
2294 llvm::MDString::get(Context, Mod->LinkLibraries[I - 1].Library),
2295 };
2296 Metadata.push_back(llvm::MDNode::get(Context, Args));
2297 } else {
2298 llvm::SmallString<24> Opt;
2299 CGM.getTargetCodeGenInfo().getDependentLibraryOption(
2300 Mod->LinkLibraries[I - 1].Library, Opt);
2301 auto *OptString = llvm::MDString::get(Context, Opt);
2302 Metadata.push_back(llvm::MDNode::get(Context, OptString));
2303 }
2304 }
2305}
2306
2307void CodeGenModule::EmitModuleLinkOptions() {
2308 // Collect the set of all of the modules we want to visit to emit link
2309 // options, which is essentially the imported modules and all of their
2310 // non-explicit child modules.
2311 llvm::SetVector<clang::Module *> LinkModules;
2312 llvm::SmallPtrSet<clang::Module *, 16> Visited;
2313 SmallVector<clang::Module *, 16> Stack;
2314
2315 // Seed the stack with imported modules.
2316 for (Module *M : ImportedModules) {
2317 // Do not add any link flags when an implementation TU of a module imports
2318 // a header of that same module.
2319 if (M->getTopLevelModuleName() == getLangOpts().CurrentModule &&
2320 !getLangOpts().isCompilingModule())
2321 continue;
2322 if (Visited.insert(M).second)
2323 Stack.push_back(M);
2324 }
2325
2326 // Find all of the modules to import, making a little effort to prune
2327 // non-leaf modules.
2328 while (!Stack.empty()) {
2329 clang::Module *Mod = Stack.pop_back_val();
2330
2331 bool AnyChildren = false;
2332
2333 // Visit the submodules of this module.
2334 for (const auto &SM : Mod->submodules()) {
2335 // Skip explicit children; they need to be explicitly imported to be
2336 // linked against.
2337 if (SM->IsExplicit)
2338 continue;
2339
2340 if (Visited.insert(SM).second) {
2341 Stack.push_back(SM);
2342 AnyChildren = true;
2343 }
2344 }
2345
2346 // We didn't find any children, so add this module to the list of
2347 // modules to link against.
2348 if (!AnyChildren) {
2349 LinkModules.insert(Mod);
2350 }
2351 }
2352
2353 // Add link options for all of the imported modules in reverse topological
2354 // order. We don't do anything to try to order import link flags with respect
2355 // to linker options inserted by things like #pragma comment().
2356 SmallVector<llvm::MDNode *, 16> MetadataArgs;
2357 Visited.clear();
2358 for (Module *M : LinkModules)
2359 if (Visited.insert(M).second)
2360 addLinkOptionsPostorder(*this, M, MetadataArgs, Visited);
2361 std::reverse(MetadataArgs.begin(), MetadataArgs.end());
2362 LinkerOptionsMetadata.append(MetadataArgs.begin(), MetadataArgs.end());
2363
2364 // Add the linker options metadata flag.
2365 auto *NMD = getModule().getOrInsertNamedMetadata("llvm.linker.options");
2366 for (auto *MD : LinkerOptionsMetadata)
2367 NMD->addOperand(MD);
2368}
2369
2370void CodeGenModule::EmitDeferred() {
2371 // Emit deferred declare target declarations.
2372 if (getLangOpts().OpenMP && !getLangOpts().OpenMPSimd)
2373 getOpenMPRuntime().emitDeferredTargetDecls();
2374
2375 // Emit code for any potentially referenced deferred decls. Since a
2376 // previously unused static decl may become used during the generation of code
2377 // for a static function, iterate until no changes are made.
2378
2379 if (!DeferredVTables.empty()) {
2380 EmitDeferredVTables();
2381
2382 // Emitting a vtable doesn't directly cause more vtables to
2383 // become deferred, although it can cause functions to be
2384 // emitted that then need those vtables.
2385 assert(DeferredVTables.empty())(static_cast <bool> (DeferredVTables.empty()) ? void (0
) : __assert_fail ("DeferredVTables.empty()", "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2385, __extension__ __PRETTY_FUNCTION__))
;
2386 }
2387
2388 // Emit CUDA/HIP static device variables referenced by host code only.
2389 // Note we should not clear CUDADeviceVarODRUsedByHost since it is still
2390 // needed for further handling.
2391 if (getLangOpts().CUDA && getLangOpts().CUDAIsDevice)
2392 for (const auto *V : getContext().CUDADeviceVarODRUsedByHost)
2393 DeferredDeclsToEmit.push_back(V);
2394
2395 // Stop if we're out of both deferred vtables and deferred declarations.
2396 if (DeferredDeclsToEmit.empty())
2397 return;
2398
2399 // Grab the list of decls to emit. If EmitGlobalDefinition schedules more
2400 // work, it will not interfere with this.
2401 std::vector<GlobalDecl> CurDeclsToEmit;
2402 CurDeclsToEmit.swap(DeferredDeclsToEmit);
2403
2404 for (GlobalDecl &D : CurDeclsToEmit) {
2405 // We should call GetAddrOfGlobal with IsForDefinition set to true in order
2406 // to get GlobalValue with exactly the type we need, not something that
2407 // might had been created for another decl with the same mangled name but
2408 // different type.
2409 llvm::GlobalValue *GV = dyn_cast<llvm::GlobalValue>(
2410 GetAddrOfGlobal(D, ForDefinition));
2411
2412 // In case of different address spaces, we may still get a cast, even with
2413 // IsForDefinition equal to true. Query mangled names table to get
2414 // GlobalValue.
2415 if (!GV)
2416 GV = GetGlobalValue(getMangledName(D));
2417
2418 // Make sure GetGlobalValue returned non-null.
2419 assert(GV)(static_cast <bool> (GV) ? void (0) : __assert_fail ("GV"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2419, __extension__ __PRETTY_FUNCTION__))
;
2420
2421 // Check to see if we've already emitted this. This is necessary
2422 // for a couple of reasons: first, decls can end up in the
2423 // deferred-decls queue multiple times, and second, decls can end
2424 // up with definitions in unusual ways (e.g. by an extern inline
2425 // function acquiring a strong function redefinition). Just
2426 // ignore these cases.
2427 if (!GV->isDeclaration())
2428 continue;
2429
2430 // If this is OpenMP, check if it is legal to emit this global normally.
2431 if (LangOpts.OpenMP && OpenMPRuntime && OpenMPRuntime->emitTargetGlobal(D))
2432 continue;
2433
2434 // Otherwise, emit the definition and move on to the next one.
2435 EmitGlobalDefinition(D, GV);
2436
2437 // If we found out that we need to emit more decls, do that recursively.
2438 // This has the advantage that the decls are emitted in a DFS and related
2439 // ones are close together, which is convenient for testing.
2440 if (!DeferredVTables.empty() || !DeferredDeclsToEmit.empty()) {
2441 EmitDeferred();
2442 assert(DeferredVTables.empty() && DeferredDeclsToEmit.empty())(static_cast <bool> (DeferredVTables.empty() &&
DeferredDeclsToEmit.empty()) ? void (0) : __assert_fail ("DeferredVTables.empty() && DeferredDeclsToEmit.empty()"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2442, __extension__ __PRETTY_FUNCTION__))
;
2443 }
2444 }
2445}
2446
2447void CodeGenModule::EmitVTablesOpportunistically() {
2448 // Try to emit external vtables as available_externally if they have emitted
2449 // all inlined virtual functions. It runs after EmitDeferred() and therefore
2450 // is not allowed to create new references to things that need to be emitted
2451 // lazily. Note that it also uses fact that we eagerly emitting RTTI.
2452
2453 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2454, __extension__ __PRETTY_FUNCTION__))
2454 && "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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2454, __extension__ __PRETTY_FUNCTION__))
;
2455
2456 for (const CXXRecordDecl *RD : OpportunisticVTables) {
2457 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2458, __extension__ __PRETTY_FUNCTION__))
2458 "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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2458, __extension__ __PRETTY_FUNCTION__))
;
2459 if (getCXXABI().canSpeculativelyEmitVTable(RD))
2460 VTables.GenerateClassData(RD);
2461 }
2462 OpportunisticVTables.clear();
2463}
2464
2465void CodeGenModule::EmitGlobalAnnotations() {
2466 if (Annotations.empty())
2467 return;
2468
2469 // Create a new global variable for the ConstantStruct in the Module.
2470 llvm::Constant *Array = llvm::ConstantArray::get(llvm::ArrayType::get(
2471 Annotations[0]->getType(), Annotations.size()), Annotations);
2472 auto *gv = new llvm::GlobalVariable(getModule(), Array->getType(), false,
2473 llvm::GlobalValue::AppendingLinkage,
2474 Array, "llvm.global.annotations");
2475 gv->setSection(AnnotationSection);
2476}
2477
2478llvm::Constant *CodeGenModule::EmitAnnotationString(StringRef Str) {
2479 llvm::Constant *&AStr = AnnotationStrings[Str];
2480 if (AStr)
2481 return AStr;
2482
2483 // Not found yet, create a new global.
2484 llvm::Constant *s = llvm::ConstantDataArray::getString(getLLVMContext(), Str);
2485 auto *gv =
2486 new llvm::GlobalVariable(getModule(), s->getType(), true,
2487 llvm::GlobalValue::PrivateLinkage, s, ".str");
2488 gv->setSection(AnnotationSection);
2489 gv->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
2490 AStr = gv;
2491 return gv;
2492}
2493
2494llvm::Constant *CodeGenModule::EmitAnnotationUnit(SourceLocation Loc) {
2495 SourceManager &SM = getContext().getSourceManager();
2496 PresumedLoc PLoc = SM.getPresumedLoc(Loc);
2497 if (PLoc.isValid())
2498 return EmitAnnotationString(PLoc.getFilename());
2499 return EmitAnnotationString(SM.getBufferName(Loc));
2500}
2501
2502llvm::Constant *CodeGenModule::EmitAnnotationLineNo(SourceLocation L) {
2503 SourceManager &SM = getContext().getSourceManager();
2504 PresumedLoc PLoc = SM.getPresumedLoc(L);
2505 unsigned LineNo = PLoc.isValid() ? PLoc.getLine() :
2506 SM.getExpansionLineNumber(L);
2507 return llvm::ConstantInt::get(Int32Ty, LineNo);
2508}
2509
2510llvm::Constant *CodeGenModule::EmitAnnotationArgs(const AnnotateAttr *Attr) {
2511 ArrayRef<Expr *> Exprs = {Attr->args_begin(), Attr->args_size()};
2512 if (Exprs.empty())
2513 return llvm::ConstantPointerNull::get(Int8PtrTy);
2514
2515 llvm::FoldingSetNodeID ID;
2516 for (Expr *E : Exprs) {
2517 ID.Add(cast<clang::ConstantExpr>(E)->getAPValueResult());
2518 }
2519 llvm::Constant *&Lookup = AnnotationArgs[ID.ComputeHash()];
2520 if (Lookup)
2521 return Lookup;
2522
2523 llvm::SmallVector<llvm::Constant *, 4> LLVMArgs;
2524 LLVMArgs.reserve(Exprs.size());
2525 ConstantEmitter ConstEmiter(*this);
2526 llvm::transform(Exprs, std::back_inserter(LLVMArgs), [&](const Expr *E) {
2527 const auto *CE = cast<clang::ConstantExpr>(E);
2528 return ConstEmiter.emitAbstract(CE->getBeginLoc(), CE->getAPValueResult(),
2529 CE->getType());
2530 });
2531 auto *Struct = llvm::ConstantStruct::getAnon(LLVMArgs);
2532 auto *GV = new llvm::GlobalVariable(getModule(), Struct->getType(), true,
2533 llvm::GlobalValue::PrivateLinkage, Struct,
2534 ".args");
2535 GV->setSection(AnnotationSection);
2536 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
2537 auto *Bitcasted = llvm::ConstantExpr::getBitCast(GV, Int8PtrTy);
2538
2539 Lookup = Bitcasted;
2540 return Bitcasted;
2541}
2542
2543llvm::Constant *CodeGenModule::EmitAnnotateAttr(llvm::GlobalValue *GV,
2544 const AnnotateAttr *AA,
2545 SourceLocation L) {
2546 // Get the globals for file name, annotation, and the line number.
2547 llvm::Constant *AnnoGV = EmitAnnotationString(AA->getAnnotation()),
2548 *UnitGV = EmitAnnotationUnit(L),
2549 *LineNoCst = EmitAnnotationLineNo(L),
2550 *Args = EmitAnnotationArgs(AA);
2551
2552 llvm::Constant *ASZeroGV = GV;
2553 if (GV->getAddressSpace() != 0) {
2554 ASZeroGV = llvm::ConstantExpr::getAddrSpaceCast(
2555 GV, GV->getValueType()->getPointerTo(0));
2556 }
2557
2558 // Create the ConstantStruct for the global annotation.
2559 llvm::Constant *Fields[] = {
2560 llvm::ConstantExpr::getBitCast(ASZeroGV, Int8PtrTy),
2561 llvm::ConstantExpr::getBitCast(AnnoGV, Int8PtrTy),
2562 llvm::ConstantExpr::getBitCast(UnitGV, Int8PtrTy),
2563 LineNoCst,
2564 Args,
2565 };
2566 return llvm::ConstantStruct::getAnon(Fields);
2567}
2568
2569void CodeGenModule::AddGlobalAnnotations(const ValueDecl *D,
2570 llvm::GlobalValue *GV) {
2571 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2571, __extension__ __PRETTY_FUNCTION__))
;
2572 // Get the struct elements for these annotations.
2573 for (const auto *I : D->specific_attrs<AnnotateAttr>())
2574 Annotations.push_back(EmitAnnotateAttr(GV, I, D->getLocation()));
2575}
2576
2577bool CodeGenModule::isInNoSanitizeList(SanitizerMask Kind, llvm::Function *Fn,
2578 SourceLocation Loc) const {
2579 const auto &NoSanitizeL = getContext().getNoSanitizeList();
2580 // NoSanitize by function name.
2581 if (NoSanitizeL.containsFunction(Kind, Fn->getName()))
2582 return true;
2583 // NoSanitize by location.
2584 if (Loc.isValid())
2585 return NoSanitizeL.containsLocation(Kind, Loc);
2586 // If location is unknown, this may be a compiler-generated function. Assume
2587 // it's located in the main file.
2588 auto &SM = Context.getSourceManager();
2589 if (const auto *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
2590 return NoSanitizeL.containsFile(Kind, MainFile->getName());
2591 }
2592 return false;
2593}
2594
2595bool CodeGenModule::isInNoSanitizeList(llvm::GlobalVariable *GV,
2596 SourceLocation Loc, QualType Ty,
2597 StringRef Category) const {
2598 // For now globals can be ignored only in ASan and KASan.
2599 const SanitizerMask EnabledAsanMask =
2600 LangOpts.Sanitize.Mask &
2601 (SanitizerKind::Address | SanitizerKind::KernelAddress |
2602 SanitizerKind::HWAddress | SanitizerKind::KernelHWAddress |
2603 SanitizerKind::MemTag);
2604 if (!EnabledAsanMask)
2605 return false;
2606 const auto &NoSanitizeL = getContext().getNoSanitizeList();
2607 if (NoSanitizeL.containsGlobal(EnabledAsanMask, GV->getName(), Category))
2608 return true;
2609 if (NoSanitizeL.containsLocation(EnabledAsanMask, Loc, Category))
2610 return true;
2611 // Check global type.
2612 if (!Ty.isNull()) {
2613 // Drill down the array types: if global variable of a fixed type is
2614 // not sanitized, we also don't instrument arrays of them.
2615 while (auto AT = dyn_cast<ArrayType>(Ty.getTypePtr()))
2616 Ty = AT->getElementType();
2617 Ty = Ty.getCanonicalType().getUnqualifiedType();
2618 // Only record types (classes, structs etc.) are ignored.
2619 if (Ty->isRecordType()) {
2620 std::string TypeStr = Ty.getAsString(getContext().getPrintingPolicy());
2621 if (NoSanitizeL.containsType(EnabledAsanMask, TypeStr, Category))
2622 return true;
2623 }
2624 }
2625 return false;
2626}
2627
2628bool CodeGenModule::imbueXRayAttrs(llvm::Function *Fn, SourceLocation Loc,
2629 StringRef Category) const {
2630 const auto &XRayFilter = getContext().getXRayFilter();
2631 using ImbueAttr = XRayFunctionFilter::ImbueAttribute;
2632 auto Attr = ImbueAttr::NONE;
2633 if (Loc.isValid())
2634 Attr = XRayFilter.shouldImbueLocation(Loc, Category);
2635 if (Attr == ImbueAttr::NONE)
2636 Attr = XRayFilter.shouldImbueFunction(Fn->getName());
2637 switch (Attr) {
2638 case ImbueAttr::NONE:
2639 return false;
2640 case ImbueAttr::ALWAYS:
2641 Fn->addFnAttr("function-instrument", "xray-always");
2642 break;
2643 case ImbueAttr::ALWAYS_ARG1:
2644 Fn->addFnAttr("function-instrument", "xray-always");
2645 Fn->addFnAttr("xray-log-args", "1");
2646 break;
2647 case ImbueAttr::NEVER:
2648 Fn->addFnAttr("function-instrument", "xray-never");
2649 break;
2650 }
2651 return true;
2652}
2653
2654bool CodeGenModule::isProfileInstrExcluded(llvm::Function *Fn,
2655 SourceLocation Loc) const {
2656 const auto &ProfileList = getContext().getProfileList();
2657 // If the profile list is empty, then instrument everything.
2658 if (ProfileList.isEmpty())
2659 return false;
2660 CodeGenOptions::ProfileInstrKind Kind = getCodeGenOpts().getProfileInstr();
2661 // First, check the function name.
2662 Optional<bool> V = ProfileList.isFunctionExcluded(Fn->getName(), Kind);
2663 if (V.hasValue())
2664 return *V;
2665 // Next, check the source location.
2666 if (Loc.isValid()) {
2667 Optional<bool> V = ProfileList.isLocationExcluded(Loc, Kind);
2668 if (V.hasValue())
2669 return *V;
2670 }
2671 // If location is unknown, this may be a compiler-generated function. Assume
2672 // it's located in the main file.
2673 auto &SM = Context.getSourceManager();
2674 if (const auto *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
2675 Optional<bool> V = ProfileList.isFileExcluded(MainFile->getName(), Kind);
2676 if (V.hasValue())
2677 return *V;
2678 }
2679 return ProfileList.getDefault();
2680}
2681
2682bool CodeGenModule::MustBeEmitted(const ValueDecl *Global) {
2683 // Never defer when EmitAllDecls is specified.
2684 if (LangOpts.EmitAllDecls)
2685 return true;
2686
2687 if (CodeGenOpts.KeepStaticConsts) {
2688 const auto *VD = dyn_cast<VarDecl>(Global);
2689 if (VD && VD->getType().isConstQualified() &&
2690 VD->getStorageDuration() == SD_Static)
2691 return true;
2692 }
2693
2694 return getContext().DeclMustBeEmitted(Global);
2695}
2696
2697bool CodeGenModule::MayBeEmittedEagerly(const ValueDecl *Global) {
2698 // In OpenMP 5.0 variables and function may be marked as
2699 // device_type(host/nohost) and we should not emit them eagerly unless we sure
2700 // that they must be emitted on the host/device. To be sure we need to have
2701 // seen a declare target with an explicit mentioning of the function, we know
2702 // we have if the level of the declare target attribute is -1. Note that we
2703 // check somewhere else if we should emit this at all.
2704 if (LangOpts.OpenMP >= 50 && !LangOpts.OpenMPSimd) {
2705 llvm::Optional<OMPDeclareTargetDeclAttr *> ActiveAttr =
2706 OMPDeclareTargetDeclAttr::getActiveAttr(Global);
2707 if (!ActiveAttr || (*ActiveAttr)->getLevel() != (unsigned)-1)
2708 return false;
2709 }
2710
2711 if (const auto *FD = dyn_cast<FunctionDecl>(Global)) {
2712 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
2713 // Implicit template instantiations may change linkage if they are later
2714 // explicitly instantiated, so they should not be emitted eagerly.
2715 return false;
2716 }
2717 if (const auto *VD = dyn_cast<VarDecl>(Global))
2718 if (Context.getInlineVariableDefinitionKind(VD) ==
2719 ASTContext::InlineVariableDefinitionKind::WeakUnknown)
2720 // A definition of an inline constexpr static data member may change
2721 // linkage later if it's redeclared outside the class.
2722 return false;
2723 // If OpenMP is enabled and threadprivates must be generated like TLS, delay
2724 // codegen for global variables, because they may be marked as threadprivate.
2725 if (LangOpts.OpenMP && LangOpts.OpenMPUseTLS &&
2726 getContext().getTargetInfo().isTLSSupported() && isa<VarDecl>(Global) &&
2727 !isTypeConstant(Global->getType(), false) &&
2728 !OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(Global))
2729 return false;
2730
2731 return true;
2732}
2733
2734ConstantAddress CodeGenModule::GetAddrOfMSGuidDecl(const MSGuidDecl *GD) {
2735 StringRef Name = getMangledName(GD);
2736
2737 // The UUID descriptor should be pointer aligned.
2738 CharUnits Alignment = CharUnits::fromQuantity(PointerAlignInBytes);
2739
2740 // Look for an existing global.
2741 if (llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name))
2742 return ConstantAddress(GV, Alignment);
2743
2744 ConstantEmitter Emitter(*this);
2745 llvm::Constant *Init;
2746
2747 APValue &V = GD->getAsAPValue();
2748 if (!V.isAbsent()) {
2749 // If possible, emit the APValue version of the initializer. In particular,
2750 // this gets the type of the constant right.
2751 Init = Emitter.emitForInitializer(
2752 GD->getAsAPValue(), GD->getType().getAddressSpace(), GD->getType());
2753 } else {
2754 // As a fallback, directly construct the constant.
2755 // FIXME: This may get padding wrong under esoteric struct layout rules.
2756 // MSVC appears to create a complete type 'struct __s_GUID' that it
2757 // presumably uses to represent these constants.
2758 MSGuidDecl::Parts Parts = GD->getParts();
2759 llvm::Constant *Fields[4] = {
2760 llvm::ConstantInt::get(Int32Ty, Parts.Part1),
2761 llvm::ConstantInt::get(Int16Ty, Parts.Part2),
2762 llvm::ConstantInt::get(Int16Ty, Parts.Part3),
2763 llvm::ConstantDataArray::getRaw(
2764 StringRef(reinterpret_cast<char *>(Parts.Part4And5), 8), 8,
2765 Int8Ty)};
2766 Init = llvm::ConstantStruct::getAnon(Fields);
2767 }
2768
2769 auto *GV = new llvm::GlobalVariable(
2770 getModule(), Init->getType(),
2771 /*isConstant=*/true, llvm::GlobalValue::LinkOnceODRLinkage, Init, Name);
2772 if (supportsCOMDAT())
2773 GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
2774 setDSOLocal(GV);
2775
2776 llvm::Constant *Addr = GV;
2777 if (!V.isAbsent()) {
2778 Emitter.finalize(GV);
2779 } else {
2780 llvm::Type *Ty = getTypes().ConvertTypeForMem(GD->getType());
2781 Addr = llvm::ConstantExpr::getBitCast(
2782 GV, Ty->getPointerTo(GV->getAddressSpace()));
2783 }
2784 return ConstantAddress(Addr, Alignment);
2785}
2786
2787ConstantAddress CodeGenModule::GetAddrOfTemplateParamObject(
2788 const TemplateParamObjectDecl *TPO) {
2789 StringRef Name = getMangledName(TPO);
2790 CharUnits Alignment = getNaturalTypeAlignment(TPO->getType());
2791
2792 if (llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name))
2793 return ConstantAddress(GV, Alignment);
2794
2795 ConstantEmitter Emitter(*this);
2796 llvm::Constant *Init = Emitter.emitForInitializer(
2797 TPO->getValue(), TPO->getType().getAddressSpace(), TPO->getType());
2798
2799 if (!Init) {
2800 ErrorUnsupported(TPO, "template parameter object");
2801 return ConstantAddress::invalid();
2802 }
2803
2804 auto *GV = new llvm::GlobalVariable(
2805 getModule(), Init->getType(),
2806 /*isConstant=*/true, llvm::GlobalValue::LinkOnceODRLinkage, Init, Name);
2807 if (supportsCOMDAT())
2808 GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
2809 Emitter.finalize(GV);
2810
2811 return ConstantAddress(GV, Alignment);
2812}
2813
2814ConstantAddress CodeGenModule::GetWeakRefReference(const ValueDecl *VD) {
2815 const AliasAttr *AA = VD->getAttr<AliasAttr>();
2816 assert(AA && "No alias?")(static_cast <bool> (AA && "No alias?") ? void (
0) : __assert_fail ("AA && \"No alias?\"", "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2816, __extension__ __PRETTY_FUNCTION__))
;
1
Assuming 'AA' is non-null
2
'?' condition is true
2817
2818 CharUnits Alignment = getContext().getDeclAlign(VD);
2819 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(VD->getType());
2820
2821 // See if there is already something with the target's name in the module.
2822 llvm::GlobalValue *Entry = GetGlobalValue(AA->getAliasee());
2823 if (Entry) {
3
Assuming 'Entry' is null
4
Taking false branch
2824 unsigned AS = getContext().getTargetAddressSpace(VD->getType());
2825 auto Ptr = llvm::ConstantExpr::getBitCast(Entry, DeclTy->getPointerTo(AS));
2826 return ConstantAddress(Ptr, Alignment);
2827 }
2828
2829 llvm::Constant *Aliasee;
2830 if (isa<llvm::FunctionType>(DeclTy))
5
Assuming 'DeclTy' is a 'FunctionType'
6
Taking true branch
2831 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy,
8
Calling 'CodeGenModule::GetOrCreateLLVMFunction'
2832 GlobalDecl(cast<FunctionDecl>(VD)),
7
'VD' is a 'FunctionDecl'
2833 /*ForVTable=*/false);
2834 else
2835 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(), DeclTy, 0, nullptr);
2836
2837 auto *F = cast<llvm::GlobalValue>(Aliasee);
2838 F->setLinkage(llvm::Function::ExternalWeakLinkage);
2839 WeakRefReferences.insert(F);
2840
2841 return ConstantAddress(Aliasee, Alignment);
2842}
2843
2844void CodeGenModule::EmitGlobal(GlobalDecl GD) {
2845 const auto *Global = cast<ValueDecl>(GD.getDecl());
22
The object is a 'ValueDecl'
2846
2847 // Weak references don't produce any output by themselves.
2848 if (Global->hasAttr<WeakRefAttr>())
23
Taking false branch
2849 return;
2850
2851 // If this is an alias definition (which otherwise looks like a declaration)
2852 // emit it now.
2853 if (Global->hasAttr<AliasAttr>())
24
Taking false branch
2854 return EmitAliasDefinition(GD);
2855
2856 // IFunc like an alias whose value is resolved at runtime by calling resolver.
2857 if (Global->hasAttr<IFuncAttr>())
25
Taking false branch
2858 return emitIFuncDefinition(GD);
2859
2860 // If this is a cpu_dispatch multiversion function, emit the resolver.
2861 if (Global->hasAttr<CPUDispatchAttr>())
26
Taking true branch
2862 return emitCPUDispatchDefinition(GD);
27
Calling 'CodeGenModule::emitCPUDispatchDefinition'
2863
2864 // If this is CUDA, be selective about which declarations we emit.
2865 if (LangOpts.CUDA) {
2866 if (LangOpts.CUDAIsDevice) {
2867 if (!Global->hasAttr<CUDADeviceAttr>() &&
2868 !Global->hasAttr<CUDAGlobalAttr>() &&
2869 !Global->hasAttr<CUDAConstantAttr>() &&
2870 !Global->hasAttr<CUDASharedAttr>() &&
2871 !Global->getType()->isCUDADeviceBuiltinSurfaceType() &&
2872 !Global->getType()->isCUDADeviceBuiltinTextureType())
2873 return;
2874 } else {
2875 // We need to emit host-side 'shadows' for all global
2876 // device-side variables because the CUDA runtime needs their
2877 // size and host-side address in order to provide access to
2878 // their device-side incarnations.
2879
2880 // So device-only functions are the only things we skip.
2881 if (isa<FunctionDecl>(Global) && !Global->hasAttr<CUDAHostAttr>() &&
2882 Global->hasAttr<CUDADeviceAttr>())
2883 return;
2884
2885 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2886, __extension__ __PRETTY_FUNCTION__))
2886 "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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2886, __extension__ __PRETTY_FUNCTION__))
;
2887 }
2888 }
2889
2890 if (LangOpts.OpenMP) {
2891 // If this is OpenMP, check if it is legal to emit this global normally.
2892 if (OpenMPRuntime && OpenMPRuntime->emitTargetGlobal(GD))
2893 return;
2894 if (auto *DRD = dyn_cast<OMPDeclareReductionDecl>(Global)) {
2895 if (MustBeEmitted(Global))
2896 EmitOMPDeclareReduction(DRD);
2897 return;
2898 } else if (auto *DMD = dyn_cast<OMPDeclareMapperDecl>(Global)) {
2899 if (MustBeEmitted(Global))
2900 EmitOMPDeclareMapper(DMD);
2901 return;
2902 }
2903 }
2904
2905 // Ignore declarations, they will be emitted on their first use.
2906 if (const auto *FD = dyn_cast<FunctionDecl>(Global)) {
2907 // Forward declarations are emitted lazily on first use.
2908 if (!FD->doesThisDeclarationHaveABody()) {
2909 if (!FD->doesDeclarationForceExternallyVisibleDefinition())
2910 return;
2911
2912 StringRef MangledName = getMangledName(GD);
2913
2914 // Compute the function info and LLVM type.
2915 const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
2916 llvm::Type *Ty = getTypes().GetFunctionType(FI);
2917
2918 GetOrCreateLLVMFunction(MangledName, Ty, GD, /*ForVTable=*/false,
2919 /*DontDefer=*/false);
2920 return;
2921 }
2922 } else {
2923 const auto *VD = cast<VarDecl>(Global);
2924 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2924, __extension__ __PRETTY_FUNCTION__))
;
2925 if (VD->isThisDeclarationADefinition() != VarDecl::Definition &&
2926 !Context.isMSStaticDataMemberInlineDefinition(VD)) {
2927 if (LangOpts.OpenMP) {
2928 // Emit declaration of the must-be-emitted declare target variable.
2929 if (llvm::Optional<OMPDeclareTargetDeclAttr::MapTypeTy> Res =
2930 OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(VD)) {
2931 bool UnifiedMemoryEnabled =
2932 getOpenMPRuntime().hasRequiresUnifiedSharedMemory();
2933 if (*Res == OMPDeclareTargetDeclAttr::MT_To &&
2934 !UnifiedMemoryEnabled) {
2935 (void)GetAddrOfGlobalVar(VD);
2936 } else {
2937 assert(((*Res == OMPDeclareTargetDeclAttr::MT_Link) ||(static_cast <bool> (((*Res == OMPDeclareTargetDeclAttr
::MT_Link) || (*Res == OMPDeclareTargetDeclAttr::MT_To &&
UnifiedMemoryEnabled)) && "Link clause or to clause with unified memory expected."
) ? void (0) : __assert_fail ("((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr::MT_To && UnifiedMemoryEnabled)) && \"Link clause or to clause with unified memory expected.\""
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2940, __extension__ __PRETTY_FUNCTION__))
2938 (*Res == OMPDeclareTargetDeclAttr::MT_To &&(static_cast <bool> (((*Res == OMPDeclareTargetDeclAttr
::MT_Link) || (*Res == OMPDeclareTargetDeclAttr::MT_To &&
UnifiedMemoryEnabled)) && "Link clause or to clause with unified memory expected."
) ? void (0) : __assert_fail ("((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr::MT_To && UnifiedMemoryEnabled)) && \"Link clause or to clause with unified memory expected.\""
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2940, __extension__ __PRETTY_FUNCTION__))
2939 UnifiedMemoryEnabled)) &&(static_cast <bool> (((*Res == OMPDeclareTargetDeclAttr
::MT_Link) || (*Res == OMPDeclareTargetDeclAttr::MT_To &&
UnifiedMemoryEnabled)) && "Link clause or to clause with unified memory expected."
) ? void (0) : __assert_fail ("((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr::MT_To && UnifiedMemoryEnabled)) && \"Link clause or to clause with unified memory expected.\""
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2940, __extension__ __PRETTY_FUNCTION__))
2940 "Link clause or to clause with unified memory expected.")(static_cast <bool> (((*Res == OMPDeclareTargetDeclAttr
::MT_Link) || (*Res == OMPDeclareTargetDeclAttr::MT_To &&
UnifiedMemoryEnabled)) && "Link clause or to clause with unified memory expected."
) ? void (0) : __assert_fail ("((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr::MT_To && UnifiedMemoryEnabled)) && \"Link clause or to clause with unified memory expected.\""
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2940, __extension__ __PRETTY_FUNCTION__))
;
2941 (void)getOpenMPRuntime().getAddrOfDeclareTargetVar(VD);
2942 }
2943
2944 return;
2945 }
2946 }
2947 // If this declaration may have caused an inline variable definition to
2948 // change linkage, make sure that it's emitted.
2949 if (Context.getInlineVariableDefinitionKind(VD) ==
2950 ASTContext::InlineVariableDefinitionKind::Strong)
2951 GetAddrOfGlobalVar(VD);
2952 return;
2953 }
2954 }
2955
2956 // Defer code generation to first use when possible, e.g. if this is an inline
2957 // function. If the global must always be emitted, do it eagerly if possible
2958 // to benefit from cache locality.
2959 if (MustBeEmitted(Global) && MayBeEmittedEagerly(Global)) {
2960 // Emit the definition if it can't be deferred.
2961 EmitGlobalDefinition(GD);
2962 return;
2963 }
2964
2965 // If we're deferring emission of a C++ variable with an
2966 // initializer, remember the order in which it appeared in the file.
2967 if (getLangOpts().CPlusPlus && isa<VarDecl>(Global) &&
2968 cast<VarDecl>(Global)->hasInit()) {
2969 DelayedCXXInitPosition[Global] = CXXGlobalInits.size();
2970 CXXGlobalInits.push_back(nullptr);
2971 }
2972
2973 StringRef MangledName = getMangledName(GD);
2974 if (GetGlobalValue(MangledName) != nullptr) {
2975 // The value has already been used and should therefore be emitted.
2976 addDeferredDeclToEmit(GD);
2977 } else if (MustBeEmitted(Global)) {
2978 // The value must be emitted, but cannot be emitted eagerly.
2979 assert(!MayBeEmittedEagerly(Global))(static_cast <bool> (!MayBeEmittedEagerly(Global)) ? void
(0) : __assert_fail ("!MayBeEmittedEagerly(Global)", "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 2979, __extension__ __PRETTY_FUNCTION__))
;
2980 addDeferredDeclToEmit(GD);
2981 } else {
2982 // Otherwise, remember that we saw a deferred decl with this name. The
2983 // first use of the mangled name will cause it to move into
2984 // DeferredDeclsToEmit.
2985 DeferredDecls[MangledName] = GD;
2986 }
2987}
2988
2989// Check if T is a class type with a destructor that's not dllimport.
2990static bool HasNonDllImportDtor(QualType T) {
2991 if (const auto *RT = T->getBaseElementTypeUnsafe()->getAs<RecordType>())
2992 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()))
2993 if (RD->getDestructor() && !RD->getDestructor()->hasAttr<DLLImportAttr>())
2994 return true;
2995
2996 return false;
2997}
2998
2999namespace {
3000 struct FunctionIsDirectlyRecursive
3001 : public ConstStmtVisitor<FunctionIsDirectlyRecursive, bool> {
3002 const StringRef Name;
3003 const Builtin::Context &BI;
3004 FunctionIsDirectlyRecursive(StringRef N, const Builtin::Context &C)
3005 : Name(N), BI(C) {}
3006
3007 bool VisitCallExpr(const CallExpr *E) {
3008 const FunctionDecl *FD = E->getDirectCallee();
3009 if (!FD)
3010 return false;
3011 AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
3012 if (Attr && Name == Attr->getLabel())
3013 return true;
3014 unsigned BuiltinID = FD->getBuiltinID();
3015 if (!BuiltinID || !BI.isLibFunction(BuiltinID))
3016 return false;
3017 StringRef BuiltinName = BI.getName(BuiltinID);
3018 if (BuiltinName.startswith("__builtin_") &&
3019 Name == BuiltinName.slice(strlen("__builtin_"), StringRef::npos)) {
3020 return true;
3021 }
3022 return false;
3023 }
3024
3025 bool VisitStmt(const Stmt *S) {
3026 for (const Stmt *Child : S->children())
3027 if (Child && this->Visit(Child))
3028 return true;
3029 return false;
3030 }
3031 };
3032
3033 // Make sure we're not referencing non-imported vars or functions.
3034 struct DLLImportFunctionVisitor
3035 : public RecursiveASTVisitor<DLLImportFunctionVisitor> {
3036 bool SafeToInline = true;
3037
3038 bool shouldVisitImplicitCode() const { return true; }
3039
3040 bool VisitVarDecl(VarDecl *VD) {
3041 if (VD->getTLSKind()) {
3042 // A thread-local variable cannot be imported.
3043 SafeToInline = false;
3044 return SafeToInline;
3045 }
3046
3047 // A variable definition might imply a destructor call.
3048 if (VD->isThisDeclarationADefinition())
3049 SafeToInline = !HasNonDllImportDtor(VD->getType());
3050
3051 return SafeToInline;
3052 }
3053
3054 bool VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) {
3055 if (const auto *D = E->getTemporary()->getDestructor())
3056 SafeToInline = D->hasAttr<DLLImportAttr>();
3057 return SafeToInline;
3058 }
3059
3060 bool VisitDeclRefExpr(DeclRefExpr *E) {
3061 ValueDecl *VD = E->getDecl();
3062 if (isa<FunctionDecl>(VD))
3063 SafeToInline = VD->hasAttr<DLLImportAttr>();
3064 else if (VarDecl *V = dyn_cast<VarDecl>(VD))
3065 SafeToInline = !V->hasGlobalStorage() || V->hasAttr<DLLImportAttr>();
3066 return SafeToInline;
3067 }
3068
3069 bool VisitCXXConstructExpr(CXXConstructExpr *E) {
3070 SafeToInline = E->getConstructor()->hasAttr<DLLImportAttr>();
3071 return SafeToInline;
3072 }
3073
3074 bool VisitCXXMemberCallExpr(CXXMemberCallExpr *E) {
3075 CXXMethodDecl *M = E->getMethodDecl();
3076 if (!M) {
3077 // Call through a pointer to member function. This is safe to inline.
3078 SafeToInline = true;
3079 } else {
3080 SafeToInline = M->hasAttr<DLLImportAttr>();
3081 }
3082 return SafeToInline;
3083 }
3084
3085 bool VisitCXXDeleteExpr(CXXDeleteExpr *E) {
3086 SafeToInline = E->getOperatorDelete()->hasAttr<DLLImportAttr>();
3087 return SafeToInline;
3088 }
3089
3090 bool VisitCXXNewExpr(CXXNewExpr *E) {
3091 SafeToInline = E->getOperatorNew()->hasAttr<DLLImportAttr>();
3092 return SafeToInline;
3093 }
3094 };
3095}
3096
3097// isTriviallyRecursive - Check if this function calls another
3098// decl that, because of the asm attribute or the other decl being a builtin,
3099// ends up pointing to itself.
3100bool
3101CodeGenModule::isTriviallyRecursive(const FunctionDecl *FD) {
3102 StringRef Name;
3103 if (getCXXABI().getMangleContext().shouldMangleDeclName(FD)) {
3104 // asm labels are a special kind of mangling we have to support.
3105 AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>();
3106 if (!Attr)
3107 return false;
3108 Name = Attr->getLabel();
3109 } else {
3110 Name = FD->getName();
3111 }
3112
3113 FunctionIsDirectlyRecursive Walker(Name, Context.BuiltinInfo);
3114 const Stmt *Body = FD->getBody();
3115 return Body ? Walker.Visit(Body) : false;
3116}
3117
3118bool CodeGenModule::shouldEmitFunction(GlobalDecl GD) {
3119 if (getFunctionLinkage(GD) != llvm::Function::AvailableExternallyLinkage)
3120 return true;
3121 const auto *F = cast<FunctionDecl>(GD.getDecl());
3122 if (CodeGenOpts.OptimizationLevel == 0 && !F->hasAttr<AlwaysInlineAttr>())
3123 return false;
3124
3125 if (F->hasAttr<DLLImportAttr>() && !F->hasAttr<AlwaysInlineAttr>()) {
3126 // Check whether it would be safe to inline this dllimport function.
3127 DLLImportFunctionVisitor Visitor;
3128 Visitor.TraverseFunctionDecl(const_cast<FunctionDecl*>(F));
3129 if (!Visitor.SafeToInline)
3130 return false;
3131
3132 if (const CXXDestructorDecl *Dtor = dyn_cast<CXXDestructorDecl>(F)) {
3133 // Implicit destructor invocations aren't captured in the AST, so the
3134 // check above can't see them. Check for them manually here.
3135 for (const Decl *Member : Dtor->getParent()->decls())
3136 if (isa<FieldDecl>(Member))
3137 if (HasNonDllImportDtor(cast<FieldDecl>(Member)->getType()))
3138 return false;
3139 for (const CXXBaseSpecifier &B : Dtor->getParent()->bases())
3140 if (HasNonDllImportDtor(B.getType()))
3141 return false;
3142 }
3143 }
3144
3145 // PR9614. Avoid cases where the source code is lying to us. An available
3146 // externally function should have an equivalent function somewhere else,
3147 // but a function that calls itself through asm label/`__builtin_` trickery is
3148 // clearly not equivalent to the real implementation.
3149 // This happens in glibc's btowc and in some configure checks.
3150 return !isTriviallyRecursive(F);
3151}
3152
3153bool CodeGenModule::shouldOpportunisticallyEmitVTables() {
3154 return CodeGenOpts.OptimizationLevel > 0;
3155}
3156
3157void CodeGenModule::EmitMultiVersionFunctionDefinition(GlobalDecl GD,
3158 llvm::GlobalValue *GV) {
3159 const auto *FD = cast<FunctionDecl>(GD.getDecl());
3160
3161 if (FD->isCPUSpecificMultiVersion()) {
3162 auto *Spec = FD->getAttr<CPUSpecificAttr>();
3163 for (unsigned I = 0; I < Spec->cpus_size(); ++I)
3164 EmitGlobalFunctionDefinition(GD.getWithMultiVersionIndex(I), nullptr);
3165 // Requires multiple emits.
3166 } else
3167 EmitGlobalFunctionDefinition(GD, GV);
3168}
3169
3170void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD, llvm::GlobalValue *GV) {
3171 const auto *D = cast<ValueDecl>(GD.getDecl());
3172
3173 PrettyStackTraceDecl CrashInfo(const_cast<ValueDecl *>(D), D->getLocation(),
3174 Context.getSourceManager(),
3175 "Generating code for declaration");
3176
3177 if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
3178 // At -O0, don't generate IR for functions with available_externally
3179 // linkage.
3180 if (!shouldEmitFunction(GD))
3181 return;
3182
3183 llvm::TimeTraceScope TimeScope("CodeGen Function", [&]() {
3184 std::string Name;
3185 llvm::raw_string_ostream OS(Name);
3186 FD->getNameForDiagnostic(OS, getContext().getPrintingPolicy(),
3187 /*Qualified=*/true);
3188 return Name;
3189 });
3190
3191 if (const auto *Method = dyn_cast<CXXMethodDecl>(D)) {
3192 // Make sure to emit the definition(s) before we emit the thunks.
3193 // This is necessary for the generation of certain thunks.
3194 if (isa<CXXConstructorDecl>(Method) || isa<CXXDestructorDecl>(Method))
3195 ABI->emitCXXStructor(GD);
3196 else if (FD->isMultiVersion())
3197 EmitMultiVersionFunctionDefinition(GD, GV);
3198 else
3199 EmitGlobalFunctionDefinition(GD, GV);
3200
3201 if (Method->isVirtual())
3202 getVTables().EmitThunks(GD);
3203
3204 return;
3205 }
3206
3207 if (FD->isMultiVersion())
3208 return EmitMultiVersionFunctionDefinition(GD, GV);
3209 return EmitGlobalFunctionDefinition(GD, GV);
3210 }
3211
3212 if (const auto *VD = dyn_cast<VarDecl>(D))
3213 return EmitGlobalVarDefinition(VD, !VD->hasDefinition());
3214
3215 llvm_unreachable("Invalid argument to EmitGlobalDefinition()")::llvm::llvm_unreachable_internal("Invalid argument to EmitGlobalDefinition()"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 3215)
;
3216}
3217
3218static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old,
3219 llvm::Function *NewFn);
3220
3221static unsigned
3222TargetMVPriority(const TargetInfo &TI,
3223 const CodeGenFunction::MultiVersionResolverOption &RO) {
3224 unsigned Priority = 0;
3225 for (StringRef Feat : RO.Conditions.Features)
3226 Priority = std::max(Priority, TI.multiVersionSortPriority(Feat));
3227
3228 if (!RO.Conditions.Architecture.empty())
3229 Priority = std::max(
3230 Priority, TI.multiVersionSortPriority(RO.Conditions.Architecture));
3231 return Priority;
3232}
3233
3234void CodeGenModule::emitMultiVersionFunctions() {
3235 std::vector<GlobalDecl> MVFuncsToEmit;
3236 MultiVersionFuncs.swap(MVFuncsToEmit);
3237 for (GlobalDecl GD : MVFuncsToEmit) {
3238 SmallVector<CodeGenFunction::MultiVersionResolverOption, 10> Options;
3239 const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
3240 getContext().forEachMultiversionedFunctionVersion(
3241 FD, [this, &GD, &Options](const FunctionDecl *CurFD) {
3242 GlobalDecl CurGD{
3243 (CurFD->isDefined() ? CurFD->getDefinition() : CurFD)};
3244 StringRef MangledName = getMangledName(CurGD);
3245 llvm::Constant *Func = GetGlobalValue(MangledName);
3246 if (!Func) {
3247 if (CurFD->isDefined()) {
3248 EmitGlobalFunctionDefinition(CurGD, nullptr);
3249 Func = GetGlobalValue(MangledName);
3250 } else {
3251 const CGFunctionInfo &FI =
3252 getTypes().arrangeGlobalDeclaration(GD);
3253 llvm::FunctionType *Ty = getTypes().GetFunctionType(FI);
3254 Func = GetAddrOfFunction(CurGD, Ty, /*ForVTable=*/false,
3255 /*DontDefer=*/false, ForDefinition);
3256 }
3257 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 3257, __extension__ __PRETTY_FUNCTION__))
;
3258 }
3259
3260 const auto *TA = CurFD->getAttr<TargetAttr>();
3261 llvm::SmallVector<StringRef, 8> Feats;
3262 TA->getAddedFeatures(Feats);
3263
3264 Options.emplace_back(cast<llvm::Function>(Func),
3265 TA->getArchitecture(), Feats);
3266 });
3267
3268 llvm::Function *ResolverFunc;
3269 const TargetInfo &TI = getTarget();
3270
3271 if (TI.supportsIFunc() || FD->isTargetMultiVersion()) {
3272 ResolverFunc = cast<llvm::Function>(
3273 GetGlobalValue((getMangledName(GD) + ".resolver").str()));
3274 ResolverFunc->setLinkage(llvm::Function::WeakODRLinkage);
3275 } else {
3276 ResolverFunc = cast<llvm::Function>(GetGlobalValue(getMangledName(GD)));
3277 }
3278
3279 if (supportsCOMDAT())
3280 ResolverFunc->setComdat(
3281 getModule().getOrInsertComdat(ResolverFunc->getName()));
3282
3283 llvm::stable_sort(
3284 Options, [&TI](const CodeGenFunction::MultiVersionResolverOption &LHS,
3285 const CodeGenFunction::MultiVersionResolverOption &RHS) {
3286 return TargetMVPriority(TI, LHS) > TargetMVPriority(TI, RHS);
3287 });
3288 CodeGenFunction CGF(*this);
3289 CGF.EmitMultiVersionResolver(ResolverFunc, Options);
3290 }
3291
3292 // Ensure that any additions to the deferred decls list caused by emitting a
3293 // variant are emitted. This can happen when the variant itself is inline and
3294 // calls a function without linkage.
3295 if (!MVFuncsToEmit.empty())
3296 EmitDeferred();
3297
3298 // Ensure that any additions to the multiversion funcs list from either the
3299 // deferred decls or the multiversion functions themselves are emitted.
3300 if (!MultiVersionFuncs.empty())
3301 emitMultiVersionFunctions();
3302}
3303
3304void CodeGenModule::emitCPUDispatchDefinition(GlobalDecl GD) {
3305 const auto *FD = cast<FunctionDecl>(GD.getDecl());
28
The object is a 'FunctionDecl'
3306 assert(FD && "Not a FunctionDecl?")(static_cast <bool> (FD && "Not a FunctionDecl?"
) ? void (0) : __assert_fail ("FD && \"Not a FunctionDecl?\""
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 3306, __extension__ __PRETTY_FUNCTION__))
;
29
'?' condition is true
3307 const auto *DD = FD->getAttr<CPUDispatchAttr>();
3308 assert(DD && "Not a cpu_dispatch Function?")(static_cast <bool> (DD && "Not a cpu_dispatch Function?"
) ? void (0) : __assert_fail ("DD && \"Not a cpu_dispatch Function?\""
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 3308, __extension__ __PRETTY_FUNCTION__))
;
30
Assuming 'DD' is non-null
31
'?' condition is true
3309 llvm::Type *DeclTy = getTypes().ConvertType(FD->getType());
3310
3311 if (const auto *CXXFD
32.1
'CXXFD' is null
32.1
'CXXFD' is null
32.1
'CXXFD' is null
32.1
'CXXFD' is null
= dyn_cast<CXXMethodDecl>(FD)) {
32
Assuming 'FD' is not a 'CXXMethodDecl'
33
Taking false branch
3312 const CGFunctionInfo &FInfo = getTypes().arrangeCXXMethodDeclaration(CXXFD);
3313 DeclTy = getTypes().GetFunctionType(FInfo);
3314 }
3315
3316 StringRef ResolverName = getMangledName(GD);
3317
3318 llvm::Type *ResolverType;
3319 GlobalDecl ResolverGD;
3320 if (getTarget().supportsIFunc())
34
Taking false branch
3321 ResolverType = llvm::FunctionType::get(
3322 llvm::PointerType::get(DeclTy,
3323 Context.getTargetAddressSpace(FD->getType())),
3324 false);
3325 else {
3326 ResolverType = DeclTy;
3327 ResolverGD = GD;
3328 }
3329
3330 auto *ResolverFunc = cast<llvm::Function>(GetOrCreateLLVMFunction(
35
The object is a 'Function'
3331 ResolverName, ResolverType, ResolverGD, /*ForVTable=*/false));
3332 ResolverFunc->setLinkage(llvm::Function::WeakODRLinkage);
3333 if (supportsCOMDAT())
36
Assuming the condition is false
37
Taking false branch
3334 ResolverFunc->setComdat(
3335 getModule().getOrInsertComdat(ResolverFunc->getName()));
3336
3337 SmallVector<CodeGenFunction::MultiVersionResolverOption, 10> Options;
3338 const TargetInfo &Target = getTarget();
3339 unsigned Index = 0;
3340 for (const IdentifierInfo *II : DD->cpus()) {
38
Assuming '__begin1' is not equal to '__end1'
3341 // Get the name of the target function so we can look it up/create it.
3342 std::string MangledName = getMangledNameImpl(*this, GD, FD, true) +
3343 getCPUSpecificMangling(*this, II->getName());
3344
3345 llvm::Constant *Func = GetGlobalValue(MangledName);
3346
3347 if (!Func) {
39
Assuming 'Func' is null
40
Taking true branch
3348 GlobalDecl ExistingDecl = Manglings.lookup(MangledName);
3349 if (ExistingDecl.getDecl() &&
41
Assuming the condition is false
3350 ExistingDecl.getDecl()->getAsFunction()->isDefined()) {
3351 EmitGlobalFunctionDefinition(ExistingDecl, nullptr);
3352 Func = GetGlobalValue(MangledName);
3353 } else {
3354 if (!ExistingDecl.getDecl())
42
Assuming the condition is false
43
Taking false branch
3355 ExistingDecl = GD.getWithMultiVersionIndex(Index);
3356
3357 Func = GetOrCreateLLVMFunction(
44
Calling 'CodeGenModule::GetOrCreateLLVMFunction'
3358 MangledName, DeclTy, ExistingDecl,
3359 /*ForVTable=*/false, /*DontDefer=*/true,
3360 /*IsThunk=*/false, llvm::AttributeList(), ForDefinition);
3361 }
3362 }
3363
3364 llvm::SmallVector<StringRef, 32> Features;
3365 Target.getCPUSpecificCPUDispatchFeatures(II->getName(), Features);
3366 llvm::transform(Features, Features.begin(),
3367 [](StringRef Str) { return Str.substr(1); });
3368 Features.erase(std::remove_if(
3369 Features.begin(), Features.end(), [&Target](StringRef Feat) {
3370 return !Target.validateCpuSupports(Feat);
3371 }), Features.end());
3372 Options.emplace_back(cast<llvm::Function>(Func), StringRef{}, Features);
3373 ++Index;
3374 }
3375
3376 llvm::stable_sort(
3377 Options, [](const CodeGenFunction::MultiVersionResolverOption &LHS,
3378 const CodeGenFunction::MultiVersionResolverOption &RHS) {
3379 return CodeGenFunction::GetX86CpuSupportsMask(LHS.Conditions.Features) >
3380 CodeGenFunction::GetX86CpuSupportsMask(RHS.Conditions.Features);
3381 });
3382
3383 // If the list contains multiple 'default' versions, such as when it contains
3384 // 'pentium' and 'generic', don't emit the call to the generic one (since we
3385 // always run on at least a 'pentium'). We do this by deleting the 'least
3386 // advanced' (read, lowest mangling letter).
3387 while (Options.size() > 1 &&
3388 CodeGenFunction::GetX86CpuSupportsMask(
3389 (Options.end() - 2)->Conditions.Features) == 0) {
3390 StringRef LHSName = (Options.end() - 2)->Function->getName();
3391 StringRef RHSName = (Options.end() - 1)->Function->getName();
3392 if (LHSName.compare(RHSName) < 0)
3393 Options.erase(Options.end() - 2);
3394 else
3395 Options.erase(Options.end() - 1);
3396 }
3397
3398 CodeGenFunction CGF(*this);
3399 CGF.EmitMultiVersionResolver(ResolverFunc, Options);
3400
3401 if (getTarget().supportsIFunc()) {
3402 std::string AliasName = getMangledNameImpl(
3403 *this, GD, FD, /*OmitMultiVersionMangling=*/true);
3404 llvm::Constant *AliasFunc = GetGlobalValue(AliasName);
3405 if (!AliasFunc) {
3406 auto *IFunc = cast<llvm::GlobalIFunc>(GetOrCreateLLVMFunction(
3407 AliasName, DeclTy, GD, /*ForVTable=*/false, /*DontDefer=*/true,
3408 /*IsThunk=*/false, llvm::AttributeList(), NotForDefinition));
3409 auto *GA = llvm::GlobalAlias::create(
3410 DeclTy, 0, getFunctionLinkage(GD), AliasName, IFunc, &getModule());
3411 GA->setLinkage(llvm::Function::WeakODRLinkage);
3412 SetCommonAttributes(GD, GA);
3413 }
3414 }
3415}
3416
3417/// If a dispatcher for the specified mangled name is not in the module, create
3418/// and return an llvm Function with the specified type.
3419llvm::Constant *CodeGenModule::GetOrCreateMultiVersionResolver(
3420 GlobalDecl GD, llvm::Type *DeclTy, const FunctionDecl *FD) {
3421 std::string MangledName =
3422 getMangledNameImpl(*this, GD, FD, /*OmitMultiVersionMangling=*/true);
3423
3424 // Holds the name of the resolver, in ifunc mode this is the ifunc (which has
3425 // a separate resolver).
3426 std::string ResolverName = MangledName;
3427 if (getTarget().supportsIFunc())
3428 ResolverName += ".ifunc";
3429 else if (FD->isTargetMultiVersion())
3430 ResolverName += ".resolver";
3431
3432 // If this already exists, just return that one.
3433 if (llvm::GlobalValue *ResolverGV = GetGlobalValue(ResolverName))
3434 return ResolverGV;
3435
3436 // Since this is the first time we've created this IFunc, make sure
3437 // that we put this multiversioned function into the list to be
3438 // replaced later if necessary (target multiversioning only).
3439 if (!FD->isCPUDispatchMultiVersion() && !FD->isCPUSpecificMultiVersion())
3440 MultiVersionFuncs.push_back(GD);
3441
3442 if (getTarget().supportsIFunc()) {
3443 llvm::Type *ResolverType = llvm::FunctionType::get(
3444 llvm::PointerType::get(
3445 DeclTy, getContext().getTargetAddressSpace(FD->getType())),
3446 false);
3447 llvm::Constant *Resolver = GetOrCreateLLVMFunction(
3448 MangledName + ".resolver", ResolverType, GlobalDecl{},
3449 /*ForVTable=*/false);
3450 llvm::GlobalIFunc *GIF = llvm::GlobalIFunc::create(
3451 DeclTy, 0, llvm::Function::WeakODRLinkage, "", Resolver, &getModule());
3452 GIF->setName(ResolverName);
3453 SetCommonAttributes(FD, GIF);
3454
3455 return GIF;
3456 }
3457
3458 llvm::Constant *Resolver = GetOrCreateLLVMFunction(
3459 ResolverName, DeclTy, GlobalDecl{}, /*ForVTable=*/false);
3460 assert(isa<llvm::GlobalValue>(Resolver) &&(static_cast <bool> (isa<llvm::GlobalValue>(Resolver
) && "Resolver should be created for the first time")
? void (0) : __assert_fail ("isa<llvm::GlobalValue>(Resolver) && \"Resolver should be created for the first time\""
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 3461, __extension__ __PRETTY_FUNCTION__))
3461 "Resolver should be created for the first time")(static_cast <bool> (isa<llvm::GlobalValue>(Resolver
) && "Resolver should be created for the first time")
? void (0) : __assert_fail ("isa<llvm::GlobalValue>(Resolver) && \"Resolver should be created for the first time\""
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 3461, __extension__ __PRETTY_FUNCTION__))
;
3462 SetCommonAttributes(FD, cast<llvm::GlobalValue>(Resolver));
3463 return Resolver;
3464}
3465
3466/// GetOrCreateLLVMFunction - If the specified mangled name is not in the
3467/// module, create and return an llvm Function with the specified type. If there
3468/// is something in the module with the specified name, return it potentially
3469/// bitcasted to the right type.
3470///
3471/// If D is non-null, it specifies a decl that correspond to this. This is used
3472/// to set the attributes on the function when it is first created.
3473llvm::Constant *CodeGenModule::GetOrCreateLLVMFunction(
3474 StringRef MangledName, llvm::Type *Ty, GlobalDecl GD, bool ForVTable,
3475 bool DontDefer, bool IsThunk, llvm::AttributeList ExtraAttrs,
3476 ForDefinition_t IsForDefinition) {
3477 const Decl *D = GD.getDecl();
45
Calling 'GlobalDecl::getDecl'
57
Returning from 'GlobalDecl::getDecl'
58
'D' initialized here
3478
3479 // Any attempts to use a MultiVersion function should result in retrieving
3480 // the iFunc instead. Name Mangling will handle the rest of the changes.
3481 if (const FunctionDecl *FD
9.1
'FD' is non-null
60.1
'FD' is null
9.1
'FD' is non-null
60.1
'FD' is null
9.1
'FD' is non-null
60.1
'FD' is null
9.1
'FD' is non-null
60.1
'FD' is null
= cast_or_null<FunctionDecl>(D)) {
9
Assuming 'D' is a 'FunctionDecl'
10
Taking true branch
59
Assuming null pointer is passed into cast
60
Assuming pointer value is null
61
Taking false branch
3482 // For the device mark the function as one that should be emitted.
3483 if (getLangOpts().OpenMPIsDevice && OpenMPRuntime &&
11
Assuming field 'OpenMPIsDevice' is not equal to 0
14
Taking true branch
3484 !OpenMPRuntime->markAsGlobalTarget(GD) && FD->isDefined() &&
12
Assuming the condition is true
13
Assuming the condition is true
3485 !DontDefer
13.1
'DontDefer' is false
13.1
'DontDefer' is false
13.1
'DontDefer' is false
13.1
'DontDefer' is false
&& !IsForDefinition
13.2
'IsForDefinition' is 0
13.2
'IsForDefinition' is 0
13.2
'IsForDefinition' is 0
13.2
'IsForDefinition' is 0
) {
3486 if (const FunctionDecl *FDDef = FD->getDefinition()) {
15
Assuming 'FDDef' is non-null
16
Taking true branch
3487 GlobalDecl GDDef;
3488 if (const auto *CD
17.1
'CD' is null
17.1
'CD' is null
17.1
'CD' is null
17.1
'CD' is null
= dyn_cast<CXXConstructorDecl>(FDDef))
17
Assuming 'FDDef' is not a 'CXXConstructorDecl'
18
Taking false branch
3489 GDDef = GlobalDecl(CD, GD.getCtorType());
3490 else if (const auto *DD
19.1
'DD' is null
19.1
'DD' is null
19.1
'DD' is null
19.1
'DD' is null
= dyn_cast<CXXDestructorDecl>(FDDef))
19
Assuming 'FDDef' is not a 'CXXDestructorDecl'
20
Taking false branch
3491 GDDef = GlobalDecl(DD, GD.getDtorType());
3492 else
3493 GDDef = GlobalDecl(FDDef);
3494 EmitGlobal(GDDef);
21
Calling 'CodeGenModule::EmitGlobal'
3495 }
3496 }
3497
3498 if (FD->isMultiVersion()) {
3499 if (FD->hasAttr<TargetAttr>())
3500 UpdateMultiVersionNames(GD, FD);
3501 if (!IsForDefinition)
3502 return GetOrCreateMultiVersionResolver(GD, Ty, FD);
3503 }
3504 }
3505
3506 // Lookup the entry, lazily creating it if necessary.
3507 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
3508 if (Entry) {
62
Assuming 'Entry' is non-null
63
Taking true branch
3509 if (WeakRefReferences.erase(Entry)) {
64
Assuming the condition is false
65
Taking false branch
3510 const FunctionDecl *FD = cast_or_null<FunctionDecl>(D);
3511 if (FD && !FD->hasAttr<WeakAttr>())
3512 Entry->setLinkage(llvm::Function::ExternalLinkage);
3513 }
3514
3515 // Handle dropped DLL attributes.
3516 if (D
65.1
'D' is null
65.1
'D' is null
65.1
'D' is null
65.1
'D' is null
&& !D->hasAttr<DLLImportAttr>() && !D->hasAttr<DLLExportAttr>()) {
3517 Entry->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
3518 setDSOLocal(Entry);
3519 }
3520
3521 // If there are two attempts to define the same mangled name, issue an
3522 // error.
3523 if (IsForDefinition
65.2
'IsForDefinition' is 1
65.2
'IsForDefinition' is 1
65.2
'IsForDefinition' is 1
65.2
'IsForDefinition' is 1
&& !Entry->isDeclaration()) {
66
Assuming the condition is true
67
Taking true branch
3524 GlobalDecl OtherGD;
3525 // Check that GD is not yet in DiagnosedConflictingDefinitions is required
3526 // to make sure that we issue an error only once.
3527 if (lookupRepresentativeDecl(MangledName, OtherGD) &&
68
Assuming the condition is true
70
Assuming the condition is true
71
Taking true branch
3528 (GD.getCanonicalDecl().getDecl() !=
69
Assuming the condition is true
3529 OtherGD.getCanonicalDecl().getDecl()) &&
3530 DiagnosedConflictingDefinitions.insert(GD).second) {
3531 getDiags().Report(D->getLocation(), diag::err_duplicate_mangled_name)
72
Called C++ object pointer is null
3532 << MangledName;
3533 getDiags().Report(OtherGD.getDecl()->getLocation(),
3534 diag::note_previous_definition);
3535 }
3536 }
3537
3538 if ((isa<llvm::Function>(Entry) || isa<llvm::GlobalAlias>(Entry)) &&
3539 (Entry->getValueType() == Ty)) {
3540 return Entry;
3541 }
3542
3543 // Make sure the result is of the correct type.
3544 // (If function is requested for a definition, we always need to create a new
3545 // function, not just return a bitcast.)
3546 if (!IsForDefinition)
3547 return llvm::ConstantExpr::getBitCast(Entry, Ty->getPointerTo());
3548 }
3549
3550 // This function doesn't have a complete type (for example, the return
3551 // type is an incomplete struct). Use a fake type instead, and make
3552 // sure not to try to set attributes.
3553 bool IsIncompleteFunction = false;
3554
3555 llvm::FunctionType *FTy;
3556 if (isa<llvm::FunctionType>(Ty)) {
3557 FTy = cast<llvm::FunctionType>(Ty);
3558 } else {
3559 FTy = llvm::FunctionType::get(VoidTy, false);
3560 IsIncompleteFunction = true;
3561 }
3562
3563 llvm::Function *F =
3564 llvm::Function::Create(FTy, llvm::Function::ExternalLinkage,
3565 Entry ? StringRef() : MangledName, &getModule());
3566
3567 // If we already created a function with the same mangled name (but different
3568 // type) before, take its name and add it to the list of functions to be
3569 // replaced with F at the end of CodeGen.
3570 //
3571 // This happens if there is a prototype for a function (e.g. "int f()") and
3572 // then a definition of a different type (e.g. "int f(int x)").
3573 if (Entry) {
3574 F->takeName(Entry);
3575
3576 // This might be an implementation of a function without a prototype, in
3577 // which case, try to do special replacement of calls which match the new
3578 // prototype. The really key thing here is that we also potentially drop
3579 // arguments from the call site so as to make a direct call, which makes the
3580 // inliner happier and suppresses a number of optimizer warnings (!) about
3581 // dropping arguments.
3582 if (!Entry->use_empty()) {
3583 ReplaceUsesOfNonProtoTypeWithRealFunction(Entry, F);
3584 Entry->removeDeadConstantUsers();
3585 }
3586
3587 llvm::Constant *BC = llvm::ConstantExpr::getBitCast(
3588 F, Entry->getValueType()->getPointerTo());
3589 addGlobalValReplacement(Entry, BC);
3590 }
3591
3592 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 3592, __extension__ __PRETTY_FUNCTION__))
;
3593 if (D)
3594 SetFunctionAttributes(GD, F, IsIncompleteFunction, IsThunk);
3595 if (ExtraAttrs.hasAttributes(llvm::AttributeList::FunctionIndex)) {
3596 llvm::AttrBuilder B(ExtraAttrs, llvm::AttributeList::FunctionIndex);
3597 F->addAttributes(llvm::AttributeList::FunctionIndex, B);
3598 }
3599
3600 if (!DontDefer) {
3601 // All MSVC dtors other than the base dtor are linkonce_odr and delegate to
3602 // each other bottoming out with the base dtor. Therefore we emit non-base
3603 // dtors on usage, even if there is no dtor definition in the TU.
3604 if (D && isa<CXXDestructorDecl>(D) &&
3605 getCXXABI().useThunkForDtorVariant(cast<CXXDestructorDecl>(D),
3606 GD.getDtorType()))
3607 addDeferredDeclToEmit(GD);
3608
3609 // This is the first use or definition of a mangled name. If there is a
3610 // deferred decl with this name, remember that we need to emit it at the end
3611 // of the file.
3612 auto DDI = DeferredDecls.find(MangledName);
3613 if (DDI != DeferredDecls.end()) {
3614 // Move the potentially referenced deferred decl to the
3615 // DeferredDeclsToEmit list, and remove it from DeferredDecls (since we
3616 // don't need it anymore).
3617 addDeferredDeclToEmit(DDI->second);
3618 DeferredDecls.erase(DDI);
3619
3620 // Otherwise, there are cases we have to worry about where we're
3621 // using a declaration for which we must emit a definition but where
3622 // we might not find a top-level definition:
3623 // - member functions defined inline in their classes
3624 // - friend functions defined inline in some class
3625 // - special member functions with implicit definitions
3626 // If we ever change our AST traversal to walk into class methods,
3627 // this will be unnecessary.
3628 //
3629 // We also don't emit a definition for a function if it's going to be an
3630 // entry in a vtable, unless it's already marked as used.
3631 } else if (getLangOpts().CPlusPlus && D) {
3632 // Look for a declaration that's lexically in a record.
3633 for (const auto *FD = cast<FunctionDecl>(D)->getMostRecentDecl(); FD;
3634 FD = FD->getPreviousDecl()) {
3635 if (isa<CXXRecordDecl>(FD->getLexicalDeclContext())) {
3636 if (FD->doesThisDeclarationHaveABody()) {
3637 addDeferredDeclToEmit(GD.getWithDecl(FD));
3638 break;
3639 }
3640 }
3641 }
3642 }
3643 }
3644
3645 // Make sure the result is of the requested type.
3646 if (!IsIncompleteFunction) {
3647 assert(F->getFunctionType() == Ty)(static_cast <bool> (F->getFunctionType() == Ty) ? void
(0) : __assert_fail ("F->getFunctionType() == Ty", "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 3647, __extension__ __PRETTY_FUNCTION__))
;
3648 return F;
3649 }
3650
3651 llvm::Type *PTy = llvm::PointerType::getUnqual(Ty);
3652 return llvm::ConstantExpr::getBitCast(F, PTy);
3653}
3654
3655/// GetAddrOfFunction - Return the address of the given function. If Ty is
3656/// non-null, then this function will use the specified type if it has to
3657/// create it (this occurs when we see a definition of the function).
3658llvm::Constant *CodeGenModule::GetAddrOfFunction(GlobalDecl GD,
3659 llvm::Type *Ty,
3660 bool ForVTable,
3661 bool DontDefer,
3662 ForDefinition_t IsForDefinition) {
3663 assert(!cast<FunctionDecl>(GD.getDecl())->isConsteval() &&(static_cast <bool> (!cast<FunctionDecl>(GD.getDecl
())->isConsteval() && "consteval function should never be emitted"
) ? void (0) : __assert_fail ("!cast<FunctionDecl>(GD.getDecl())->isConsteval() && \"consteval function should never be emitted\""
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 3664, __extension__ __PRETTY_FUNCTION__))
3664 "consteval function should never be emitted")(static_cast <bool> (!cast<FunctionDecl>(GD.getDecl
())->isConsteval() && "consteval function should never be emitted"
) ? void (0) : __assert_fail ("!cast<FunctionDecl>(GD.getDecl())->isConsteval() && \"consteval function should never be emitted\""
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 3664, __extension__ __PRETTY_FUNCTION__))
;
3665 // If there was no specific requested type, just convert it now.
3666 if (!Ty) {
3667 const auto *FD = cast<FunctionDecl>(GD.getDecl());
3668 Ty = getTypes().ConvertType(FD->getType());
3669 }
3670
3671 // Devirtualized destructor calls may come through here instead of via
3672 // getAddrOfCXXStructor. Make sure we use the MS ABI base destructor instead
3673 // of the complete destructor when necessary.
3674 if (const auto *DD = dyn_cast<CXXDestructorDecl>(GD.getDecl())) {
3675 if (getTarget().getCXXABI().isMicrosoft() &&
3676 GD.getDtorType() == Dtor_Complete &&
3677 DD->getParent()->getNumVBases() == 0)
3678 GD = GlobalDecl(DD, Dtor_Base);
3679 }
3680
3681 StringRef MangledName = getMangledName(GD);
3682 auto *F = GetOrCreateLLVMFunction(MangledName, Ty, GD, ForVTable, DontDefer,
3683 /*IsThunk=*/false, llvm::AttributeList(),
3684 IsForDefinition);
3685 // Returns kernel handle for HIP kernel stub function.
3686 if (LangOpts.CUDA && !LangOpts.CUDAIsDevice &&
3687 cast<FunctionDecl>(GD.getDecl())->hasAttr<CUDAGlobalAttr>()) {
3688 auto *Handle = getCUDARuntime().getKernelHandle(
3689 cast<llvm::Function>(F->stripPointerCasts()), GD);
3690 if (IsForDefinition)
3691 return F;
3692 return llvm::ConstantExpr::getBitCast(Handle, Ty->getPointerTo());
3693 }
3694 return F;
3695}
3696
3697static const FunctionDecl *
3698GetRuntimeFunctionDecl(ASTContext &C, StringRef Name) {
3699 TranslationUnitDecl *TUDecl = C.getTranslationUnitDecl();
3700 DeclContext *DC = TranslationUnitDecl::castToDeclContext(TUDecl);
3701
3702 IdentifierInfo &CII = C.Idents.get(Name);
3703 for (const auto *Result : DC->lookup(&CII))
3704 if (const auto *FD = dyn_cast<FunctionDecl>(Result))
3705 return FD;
3706
3707 if (!C.getLangOpts().CPlusPlus)
3708 return nullptr;
3709
3710 // Demangle the premangled name from getTerminateFn()
3711 IdentifierInfo &CXXII =
3712 (Name == "_ZSt9terminatev" || Name == "?terminate@@YAXXZ")
3713 ? C.Idents.get("terminate")
3714 : C.Idents.get(Name);
3715
3716 for (const auto &N : {"__cxxabiv1", "std"}) {
3717 IdentifierInfo &NS = C.Idents.get(N);
3718 for (const auto *Result : DC->lookup(&NS)) {
3719 const NamespaceDecl *ND = dyn_cast<NamespaceDecl>(Result);
3720 if (auto *LSD = dyn_cast<LinkageSpecDecl>(Result))
3721 for (const auto *Result : LSD->lookup(&NS))
3722 if ((ND = dyn_cast<NamespaceDecl>(Result)))
3723 break;
3724
3725 if (ND)
3726 for (const auto *Result : ND->lookup(&CXXII))
3727 if (const auto *FD = dyn_cast<FunctionDecl>(Result))
3728 return FD;
3729 }
3730 }
3731
3732 return nullptr;
3733}
3734
3735/// CreateRuntimeFunction - Create a new runtime function with the specified
3736/// type and name.
3737llvm::FunctionCallee
3738CodeGenModule::CreateRuntimeFunction(llvm::FunctionType *FTy, StringRef Name,
3739 llvm::AttributeList ExtraAttrs, bool Local,
3740 bool AssumeConvergent) {
3741 if (AssumeConvergent) {
3742 ExtraAttrs =
3743 ExtraAttrs.addAttribute(VMContext, llvm::AttributeList::FunctionIndex,
3744 llvm::Attribute::Convergent);
3745 }
3746
3747 llvm::Constant *C =
3748 GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(), /*ForVTable=*/false,
3749 /*DontDefer=*/false, /*IsThunk=*/false,
3750 ExtraAttrs);
3751
3752 if (auto *F = dyn_cast<llvm::Function>(C)) {
3753 if (F->empty()) {
3754 F->setCallingConv(getRuntimeCC());
3755
3756 // In Windows Itanium environments, try to mark runtime functions
3757 // dllimport. For Mingw and MSVC, don't. We don't really know if the user
3758 // will link their standard library statically or dynamically. Marking
3759 // functions imported when they are not imported can cause linker errors
3760 // and warnings.
3761 if (!Local && getTriple().isWindowsItaniumEnvironment() &&
3762 !getCodeGenOpts().LTOVisibilityPublicStd) {
3763 const FunctionDecl *FD = GetRuntimeFunctionDecl(Context, Name);
3764 if (!FD || FD->hasAttr<DLLImportAttr>()) {
3765 F->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
3766 F->setLinkage(llvm::GlobalValue::ExternalLinkage);
3767 }
3768 }
3769 setDSOLocal(F);
3770 }
3771 }
3772
3773 return {FTy, C};
3774}
3775
3776/// isTypeConstant - Determine whether an object of this type can be emitted
3777/// as a constant.
3778///
3779/// If ExcludeCtor is true, the duration when the object's constructor runs
3780/// will not be considered. The caller will need to verify that the object is
3781/// not written to during its construction.
3782bool CodeGenModule::isTypeConstant(QualType Ty, bool ExcludeCtor) {
3783 if (!Ty.isConstant(Context) && !Ty->isReferenceType())
3784 return false;
3785
3786 if (Context.getLangOpts().CPlusPlus) {
3787 if (const CXXRecordDecl *Record
3788 = Context.getBaseElementType(Ty)->getAsCXXRecordDecl())
3789 return ExcludeCtor && !Record->hasMutableFields() &&
3790 Record->hasTrivialDestructor();
3791 }
3792
3793 return true;
3794}
3795
3796/// GetOrCreateLLVMGlobal - If the specified mangled name is not in the module,
3797/// create and return an llvm GlobalVariable with the specified type and address
3798/// space. If there is something in the module with the specified name, return
3799/// it potentially bitcasted to the right type.
3800///
3801/// If D is non-null, it specifies a decl that correspond to this. This is used
3802/// to set the attributes on the global when it is first created.
3803///
3804/// If IsForDefinition is true, it is guaranteed that an actual global with
3805/// type Ty will be returned, not conversion of a variable with the same
3806/// mangled name but some other type.
3807llvm::Constant *
3808CodeGenModule::GetOrCreateLLVMGlobal(StringRef MangledName, llvm::Type *Ty,
3809 unsigned AddrSpace, const VarDecl *D,
3810 ForDefinition_t IsForDefinition) {
3811 // Lookup the entry, lazily creating it if necessary.
3812 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
3813 if (Entry) {
3814 if (WeakRefReferences.erase(Entry)) {
3815 if (D && !D->hasAttr<WeakAttr>())
3816 Entry->setLinkage(llvm::Function::ExternalLinkage);
3817 }
3818
3819 // Handle dropped DLL attributes.
3820 if (D && !D->hasAttr<DLLImportAttr>() && !D->hasAttr<DLLExportAttr>())
3821 Entry->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
3822
3823 if (LangOpts.OpenMP && !LangOpts.OpenMPSimd && D)
3824 getOpenMPRuntime().registerTargetGlobalVariable(D, Entry);
3825
3826 if (Entry->getValueType() == Ty && Entry->getAddressSpace() == AddrSpace)
3827 return Entry;
3828
3829 // If there are two attempts to define the same mangled name, issue an
3830 // error.
3831 if (IsForDefinition && !Entry->isDeclaration()) {
3832 GlobalDecl OtherGD;
3833 const VarDecl *OtherD;
3834
3835 // Check that D is not yet in DiagnosedConflictingDefinitions is required
3836 // to make sure that we issue an error only once.
3837 if (D && lookupRepresentativeDecl(MangledName, OtherGD) &&
3838 (D->getCanonicalDecl() != OtherGD.getCanonicalDecl().getDecl()) &&
3839 (OtherD = dyn_cast<VarDecl>(OtherGD.getDecl())) &&
3840 OtherD->hasInit() &&
3841 DiagnosedConflictingDefinitions.insert(D).second) {
3842 getDiags().Report(D->getLocation(), diag::err_duplicate_mangled_name)
3843 << MangledName;
3844 getDiags().Report(OtherGD.getDecl()->getLocation(),
3845 diag::note_previous_definition);
3846 }
3847 }
3848
3849 // Make sure the result is of the correct type.
3850 if (Entry->getType()->getAddressSpace() != AddrSpace) {
3851 return llvm::ConstantExpr::getAddrSpaceCast(Entry,
3852 Ty->getPointerTo(AddrSpace));
3853 }
3854
3855 // (If global is requested for a definition, we always need to create a new
3856 // global, not just return a bitcast.)
3857 if (!IsForDefinition)
3858 return llvm::ConstantExpr::getBitCast(Entry, Ty->getPointerTo(AddrSpace));
3859 }
3860
3861 auto DAddrSpace = GetGlobalVarAddressSpace(D);
3862 auto TargetAddrSpace = getContext().getTargetAddressSpace(DAddrSpace);
3863
3864 auto *GV = new llvm::GlobalVariable(
3865 getModule(), Ty, false, llvm::GlobalValue::ExternalLinkage, nullptr,
3866 MangledName, nullptr, llvm::GlobalVariable::NotThreadLocal,
3867 TargetAddrSpace);
3868
3869 // If we already created a global with the same mangled name (but different
3870 // type) before, take its name and remove it from its parent.
3871 if (Entry) {
3872 GV->takeName(Entry);
3873
3874 if (!Entry->use_empty()) {
3875 llvm::Constant *NewPtrForOldDecl =
3876 llvm::ConstantExpr::getBitCast(GV, Entry->getType());
3877 Entry->replaceAllUsesWith(NewPtrForOldDecl);
3878 }
3879
3880 Entry->eraseFromParent();
3881 }
3882
3883 // This is the first use or definition of a mangled name. If there is a
3884 // deferred decl with this name, remember that we need to emit it at the end
3885 // of the file.
3886 auto DDI = DeferredDecls.find(MangledName);
3887 if (DDI != DeferredDecls.end()) {
3888 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit
3889 // list, and remove it from DeferredDecls (since we don't need it anymore).
3890 addDeferredDeclToEmit(DDI->second);
3891 DeferredDecls.erase(DDI);
3892 }
3893
3894 // Handle things which are present even on external declarations.
3895 if (D) {
3896 if (LangOpts.OpenMP && !LangOpts.OpenMPSimd)
3897 getOpenMPRuntime().registerTargetGlobalVariable(D, GV);
3898
3899 // FIXME: This code is overly simple and should be merged with other global
3900 // handling.
3901 GV->setConstant(isTypeConstant(D->getType(), false));
3902
3903 GV->setAlignment(getContext().getDeclAlign(D).getAsAlign());
3904
3905 setLinkageForGV(GV, D);
3906
3907 if (D->getTLSKind()) {
3908 if (D->getTLSKind() == VarDecl::TLS_Dynamic)
3909 CXXThreadLocals.push_back(D);
3910 setTLSMode(GV, *D);
3911 }
3912
3913 setGVProperties(GV, D);
3914
3915 // If required by the ABI, treat declarations of static data members with
3916 // inline initializers as definitions.
3917 if (getContext().isMSStaticDataMemberInlineDefinition(D)) {
3918 EmitGlobalVarDefinition(D);
3919 }
3920
3921 // Emit section information for extern variables.
3922 if (D->hasExternalStorage()) {
3923 if (const SectionAttr *SA = D->getAttr<SectionAttr>())
3924 GV->setSection(SA->getName());
3925 }
3926
3927 // Handle XCore specific ABI requirements.
3928 if (getTriple().getArch() == llvm::Triple::xcore &&
3929 D->getLanguageLinkage() == CLanguageLinkage &&
3930 D->getType().isConstant(Context) &&
3931 isExternallyVisible(D->getLinkageAndVisibility().getLinkage()))
3932 GV->setSection(".cp.rodata");
3933
3934 // Check if we a have a const declaration with an initializer, we may be
3935 // able to emit it as available_externally to expose it's value to the
3936 // optimizer.
3937 if (Context.getLangOpts().CPlusPlus && GV->hasExternalLinkage() &&
3938 D->getType().isConstQualified() && !GV->hasInitializer() &&
3939 !D->hasDefinition() && D->hasInit() && !D->hasAttr<DLLImportAttr>()) {
3940 const auto *Record =
3941 Context.getBaseElementType(D->getType())->getAsCXXRecordDecl();
3942 bool HasMutableFields = Record && Record->hasMutableFields();
3943 if (!HasMutableFields) {
3944 const VarDecl *InitDecl;
3945 const Expr *InitExpr = D->getAnyInitializer(InitDecl);
3946 if (InitExpr) {
3947 ConstantEmitter emitter(*this);
3948 llvm::Constant *Init = emitter.tryEmitForInitializer(*InitDecl);
3949 if (Init) {
3950 auto *InitType = Init->getType();
3951 if (GV->getValueType() != InitType) {
3952 // The type of the initializer does not match the definition.
3953 // This happens when an initializer has a different type from
3954 // the type of the global (because of padding at the end of a
3955 // structure for instance).
3956 GV->setName(StringRef());
3957 // Make a new global with the correct type, this is now guaranteed
3958 // to work.
3959 auto *NewGV = cast<llvm::GlobalVariable>(
3960 GetAddrOfGlobalVar(D, InitType, IsForDefinition)
3961 ->stripPointerCasts());
3962
3963 // Erase the old global, since it is no longer used.
3964 GV->eraseFromParent();
3965 GV = NewGV;
3966 } else {
3967 GV->setInitializer(Init);
3968 GV->setConstant(true);
3969 GV->setLinkage(llvm::GlobalValue::AvailableExternallyLinkage);
3970 }
3971 emitter.finalize(GV);
3972 }
3973 }
3974 }
3975 }
3976 }
3977
3978 if (GV->isDeclaration()) {
3979 getTargetCodeGenInfo().setTargetAttributes(D, GV, *this);
3980 // External HIP managed variables needed to be recorded for transformation
3981 // in both device and host compilations.
3982 if (getLangOpts().CUDA && D && D->hasAttr<HIPManagedAttr>() &&
3983 D->hasExternalStorage())
3984 getCUDARuntime().handleVarRegistration(D, *GV);
3985 }
3986
3987 LangAS ExpectedAS =
3988 D ? D->getType().getAddressSpace()
3989 : (LangOpts.OpenCL ? LangAS::opencl_global : LangAS::Default);
3990 assert(getContext().getTargetAddressSpace(ExpectedAS) == AddrSpace)(static_cast <bool> (getContext().getTargetAddressSpace
(ExpectedAS) == AddrSpace) ? void (0) : __assert_fail ("getContext().getTargetAddressSpace(ExpectedAS) == AddrSpace"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 3990, __extension__ __PRETTY_FUNCTION__))
;
3991 if (DAddrSpace != ExpectedAS) {
3992 return getTargetCodeGenInfo().performAddrSpaceCast(
3993 *this, GV, DAddrSpace, ExpectedAS, Ty->getPointerTo(AddrSpace));
3994 }
3995
3996 return GV;
3997}
3998
3999llvm::Constant *
4000CodeGenModule::GetAddrOfGlobal(GlobalDecl GD, ForDefinition_t IsForDefinition) {
4001 const Decl *D = GD.getDecl();
4002
4003 if (isa<CXXConstructorDecl>(D) || isa<CXXDestructorDecl>(D))
4004 return getAddrOfCXXStructor(GD, /*FnInfo=*/nullptr, /*FnType=*/nullptr,
4005 /*DontDefer=*/false, IsForDefinition);
4006
4007 if (isa<CXXMethodDecl>(D)) {
4008 auto FInfo =
4009 &getTypes().arrangeCXXMethodDeclaration(cast<CXXMethodDecl>(D));
4010 auto Ty = getTypes().GetFunctionType(*FInfo);
4011 return GetAddrOfFunction(GD, Ty, /*ForVTable=*/false, /*DontDefer=*/false,
4012 IsForDefinition);
4013 }
4014
4015 if (isa<FunctionDecl>(D)) {
4016 const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
4017 llvm::FunctionType *Ty = getTypes().GetFunctionType(FI);
4018 return GetAddrOfFunction(GD, Ty, /*ForVTable=*/false, /*DontDefer=*/false,
4019 IsForDefinition);
4020 }
4021
4022 return GetAddrOfGlobalVar(cast<VarDecl>(D), /*Ty=*/nullptr, IsForDefinition);
4023}
4024
4025llvm::GlobalVariable *CodeGenModule::CreateOrReplaceCXXRuntimeVariable(
4026 StringRef Name, llvm::Type *Ty, llvm::GlobalValue::LinkageTypes Linkage,
4027 unsigned Alignment) {
4028 llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name);
4029 llvm::GlobalVariable *OldGV = nullptr;
4030
4031 if (GV) {
4032 // Check if the variable has the right type.
4033 if (GV->getValueType() == Ty)
4034 return GV;
4035
4036 // Because C++ name mangling, the only way we can end up with an already
4037 // existing global with the same name is if it has been declared extern "C".
4038 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 4038, __extension__ __PRETTY_FUNCTION__))
;
4039 OldGV = GV;
4040 }
4041
4042 // Create a new variable.
4043 GV = new llvm::GlobalVariable(getModule(), Ty, /*isConstant=*/true,
4044 Linkage, nullptr, Name);
4045
4046 if (OldGV) {
4047 // Replace occurrences of the old variable if needed.
4048 GV->takeName(OldGV);
4049
4050 if (!OldGV->use_empty()) {
4051 llvm::Constant *NewPtrForOldDecl =
4052 llvm::ConstantExpr::getBitCast(GV, OldGV->getType());
4053 OldGV->replaceAllUsesWith(NewPtrForOldDecl);
4054 }
4055
4056 OldGV->eraseFromParent();
4057 }
4058
4059 if (supportsCOMDAT() && GV->isWeakForLinker() &&
4060 !GV->hasAvailableExternallyLinkage())
4061 GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
4062
4063 GV->setAlignment(llvm::MaybeAlign(Alignment));
4064
4065 return GV;
4066}
4067
4068/// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the
4069/// given global variable. If Ty is non-null and if the global doesn't exist,
4070/// then it will be created with the specified type instead of whatever the
4071/// normal requested type would be. If IsForDefinition is true, it is guaranteed
4072/// that an actual global with type Ty will be returned, not conversion of a
4073/// variable with the same mangled name but some other type.
4074llvm::Constant *CodeGenModule::GetAddrOfGlobalVar(const VarDecl *D,
4075 llvm::Type *Ty,
4076 ForDefinition_t IsForDefinition) {
4077 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 4077, __extension__ __PRETTY_FUNCTION__))
;
4078 QualType ASTTy = D->getType();
4079 if (!Ty)
4080 Ty = getTypes().ConvertTypeForMem(ASTTy);
4081
4082 StringRef MangledName = getMangledName(D);
4083 return GetOrCreateLLVMGlobal(MangledName, Ty,
4084 getContext().getTargetAddressSpace(ASTTy), D,
4085 IsForDefinition);
4086}
4087
4088/// CreateRuntimeVariable - Create a new runtime global variable with the
4089/// specified type and name.
4090llvm::Constant *
4091CodeGenModule::CreateRuntimeVariable(llvm::Type *Ty,
4092 StringRef Name) {
4093 auto AddrSpace =
4094 getContext().getLangOpts().OpenCL
4095 ? getContext().getTargetAddressSpace(LangAS::opencl_global)
4096 : 0;
4097 auto *Ret = GetOrCreateLLVMGlobal(Name, Ty, AddrSpace, nullptr);
4098 setDSOLocal(cast<llvm::GlobalValue>(Ret->stripPointerCasts()));
4099 return Ret;
4100}
4101
4102void CodeGenModule::EmitTentativeDefinition(const VarDecl *D) {
4103 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 4103, __extension__ __PRETTY_FUNCTION__))
;
4104
4105 StringRef MangledName = getMangledName(D);
4106 llvm::GlobalValue *GV = GetGlobalValue(MangledName);
4107
4108 // We already have a definition, not declaration, with the same mangled name.
4109 // Emitting of declaration is not required (and actually overwrites emitted
4110 // definition).
4111 if (GV && !GV->isDeclaration())
4112 return;
4113
4114 // If we have not seen a reference to this variable yet, place it into the
4115 // deferred declarations table to be emitted if needed later.
4116 if (!MustBeEmitted(D) && !GV) {
4117 DeferredDecls[MangledName] = D;
4118 return;
4119 }
4120
4121 // The tentative definition is the only definition.
4122 EmitGlobalVarDefinition(D);
4123}
4124
4125void CodeGenModule::EmitExternalDeclaration(const VarDecl *D) {
4126 EmitExternalVarDeclaration(D);
4127}
4128
4129CharUnits CodeGenModule::GetTargetTypeStoreSize(llvm::Type *Ty) const {
4130 return Context.toCharUnitsFromBits(
4131 getDataLayout().getTypeStoreSizeInBits(Ty));
4132}
4133
4134LangAS CodeGenModule::GetGlobalVarAddressSpace(const VarDecl *D) {
4135 LangAS AddrSpace = LangAS::Default;
4136 if (LangOpts.OpenCL) {
4137 AddrSpace = D ? D->getType().getAddressSpace() : LangAS::opencl_global;
4138 assert(AddrSpace == LangAS::opencl_global ||(static_cast <bool> (AddrSpace == LangAS::opencl_global
|| AddrSpace == LangAS::opencl_global_device || AddrSpace ==
LangAS::opencl_global_host || AddrSpace == LangAS::opencl_constant
|| AddrSpace == LangAS::opencl_local || AddrSpace >= LangAS
::FirstTargetAddressSpace) ? void (0) : __assert_fail ("AddrSpace == LangAS::opencl_global || AddrSpace == LangAS::opencl_global_device || AddrSpace == LangAS::opencl_global_host || AddrSpace == LangAS::opencl_constant || AddrSpace == LangAS::opencl_local || AddrSpace >= LangAS::FirstTargetAddressSpace"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 4143, __extension__ __PRETTY_FUNCTION__))
4139 AddrSpace == LangAS::opencl_global_device ||(static_cast <bool> (AddrSpace == LangAS::opencl_global
|| AddrSpace == LangAS::opencl_global_device || AddrSpace ==
LangAS::opencl_global_host || AddrSpace == LangAS::opencl_constant
|| AddrSpace == LangAS::opencl_local || AddrSpace >= LangAS
::FirstTargetAddressSpace) ? void (0) : __assert_fail ("AddrSpace == LangAS::opencl_global || AddrSpace == LangAS::opencl_global_device || AddrSpace == LangAS::opencl_global_host || AddrSpace == LangAS::opencl_constant || AddrSpace == LangAS::opencl_local || AddrSpace >= LangAS::FirstTargetAddressSpace"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 4143, __extension__ __PRETTY_FUNCTION__))
4140 AddrSpace == LangAS::opencl_global_host ||(static_cast <bool> (AddrSpace == LangAS::opencl_global
|| AddrSpace == LangAS::opencl_global_device || AddrSpace ==
LangAS::opencl_global_host || AddrSpace == LangAS::opencl_constant
|| AddrSpace == LangAS::opencl_local || AddrSpace >= LangAS
::FirstTargetAddressSpace) ? void (0) : __assert_fail ("AddrSpace == LangAS::opencl_global || AddrSpace == LangAS::opencl_global_device || AddrSpace == LangAS::opencl_global_host || AddrSpace == LangAS::opencl_constant || AddrSpace == LangAS::opencl_local || AddrSpace >= LangAS::FirstTargetAddressSpace"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 4143, __extension__ __PRETTY_FUNCTION__))
4141 AddrSpace == LangAS::opencl_constant ||(static_cast <bool> (AddrSpace == LangAS::opencl_global
|| AddrSpace == LangAS::opencl_global_device || AddrSpace ==
LangAS::opencl_global_host || AddrSpace == LangAS::opencl_constant
|| AddrSpace == LangAS::opencl_local || AddrSpace >= LangAS
::FirstTargetAddressSpace) ? void (0) : __assert_fail ("AddrSpace == LangAS::opencl_global || AddrSpace == LangAS::opencl_global_device || AddrSpace == LangAS::opencl_global_host || AddrSpace == LangAS::opencl_constant || AddrSpace == LangAS::opencl_local || AddrSpace >= LangAS::FirstTargetAddressSpace"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 4143, __extension__ __PRETTY_FUNCTION__))
4142 AddrSpace == LangAS::opencl_local ||(static_cast <bool> (AddrSpace == LangAS::opencl_global
|| AddrSpace == LangAS::opencl_global_device || AddrSpace ==
LangAS::opencl_global_host || AddrSpace == LangAS::opencl_constant
|| AddrSpace == LangAS::opencl_local || AddrSpace >= LangAS
::FirstTargetAddressSpace) ? void (0) : __assert_fail ("AddrSpace == LangAS::opencl_global || AddrSpace == LangAS::opencl_global_device || AddrSpace == LangAS::opencl_global_host || AddrSpace == LangAS::opencl_constant || AddrSpace == LangAS::opencl_local || AddrSpace >= LangAS::FirstTargetAddressSpace"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 4143, __extension__ __PRETTY_FUNCTION__))
4143 AddrSpace >= LangAS::FirstTargetAddressSpace)(static_cast <bool> (AddrSpace == LangAS::opencl_global
|| AddrSpace == LangAS::opencl_global_device || AddrSpace ==
LangAS::opencl_global_host || AddrSpace == LangAS::opencl_constant
|| AddrSpace == LangAS::opencl_local || AddrSpace >= LangAS
::FirstTargetAddressSpace) ? void (0) : __assert_fail ("AddrSpace == LangAS::opencl_global || AddrSpace == LangAS::opencl_global_device || AddrSpace == LangAS::opencl_global_host || AddrSpace == LangAS::opencl_constant || AddrSpace == LangAS::opencl_local || AddrSpace >= LangAS::FirstTargetAddressSpace"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 4143, __extension__ __PRETTY_FUNCTION__))
;
4144 return AddrSpace;
4145 }
4146
4147 if (LangOpts.SYCLIsDevice &&
4148 (!D || D->getType().getAddressSpace() == LangAS::Default))
4149 return LangAS::sycl_global;
4150
4151 if (LangOpts.CUDA && LangOpts.CUDAIsDevice) {
4152 if (D && D->hasAttr<CUDAConstantAttr>())
4153 return LangAS::cuda_constant;
4154 else if (D && D->hasAttr<CUDASharedAttr>())
4155 return LangAS::cuda_shared;
4156 else if (D && D->hasAttr<CUDADeviceAttr>())
4157 return LangAS::cuda_device;
4158 else if (D && D->getType().isConstQualified())
4159 return LangAS::cuda_constant;
4160 else
4161 return LangAS::cuda_device;
4162 }
4163
4164 if (LangOpts.OpenMP) {
4165 LangAS AS;
4166 if (OpenMPRuntime->hasAllocateAttributeForGlobalVar(D, AS))
4167 return AS;
4168 }
4169 return getTargetCodeGenInfo().getGlobalVarAddressSpace(*this, D);
4170}
4171
4172LangAS CodeGenModule::GetGlobalConstantAddressSpace() const {
4173 // OpenCL v1.2 s6.5.3: a string literal is in the constant address space.
4174 if (LangOpts.OpenCL)
4175 return LangAS::opencl_constant;
4176 if (LangOpts.SYCLIsDevice)
4177 return LangAS::sycl_global;
4178 if (auto AS = getTarget().getConstantAddressSpace())
4179 return AS.getValue();
4180 return LangAS::Default;
4181}
4182
4183// In address space agnostic languages, string literals are in default address
4184// space in AST. However, certain targets (e.g. amdgcn) request them to be
4185// emitted in constant address space in LLVM IR. To be consistent with other
4186// parts of AST, string literal global variables in constant address space
4187// need to be casted to default address space before being put into address
4188// map and referenced by other part of CodeGen.
4189// In OpenCL, string literals are in constant address space in AST, therefore
4190// they should not be casted to default address space.
4191static llvm::Constant *
4192castStringLiteralToDefaultAddressSpace(CodeGenModule &CGM,
4193 llvm::GlobalVariable *GV) {
4194 llvm::Constant *Cast = GV;
4195 if (!CGM.getLangOpts().OpenCL) {
4196 auto AS = CGM.GetGlobalConstantAddressSpace();
4197 if (AS != LangAS::Default)
4198 Cast = CGM.getTargetCodeGenInfo().performAddrSpaceCast(
4199 CGM, GV, AS, LangAS::Default,
4200 GV->getValueType()->getPointerTo(
4201 CGM.getContext().getTargetAddressSpace(LangAS::Default)));
4202 }
4203 return Cast;
4204}
4205
4206template<typename SomeDecl>
4207void CodeGenModule::MaybeHandleStaticInExternC(const SomeDecl *D,
4208 llvm::GlobalValue *GV) {
4209 if (!getLangOpts().CPlusPlus)
4210 return;
4211
4212 // Must have 'used' attribute, or else inline assembly can't rely on
4213 // the name existing.
4214 if (!D->template hasAttr<UsedAttr>())
4215 return;
4216
4217 // Must have internal linkage and an ordinary name.
4218 if (!D->getIdentifier() || D->getFormalLinkage() != InternalLinkage)
4219 return;
4220
4221 // Must be in an extern "C" context. Entities declared directly within
4222 // a record are not extern "C" even if the record is in such a context.
4223 const SomeDecl *First = D->getFirstDecl();
4224 if (First->getDeclContext()->isRecord() || !First->isInExternCContext())
4225 return;
4226
4227 // OK, this is an internal linkage entity inside an extern "C" linkage
4228 // specification. Make a note of that so we can give it the "expected"
4229 // mangled name if nothing else is using that name.
4230 std::pair<StaticExternCMap::iterator, bool> R =
4231 StaticExternCValues.insert(std::make_pair(D->getIdentifier(), GV));
4232
4233 // If we have multiple internal linkage entities with the same name
4234 // in extern "C" regions, none of them gets that name.
4235 if (!R.second)
4236 R.first->second = nullptr;
4237}
4238
4239static bool shouldBeInCOMDAT(CodeGenModule &CGM, const Decl &D) {
4240 if (!CGM.supportsCOMDAT())
4241 return false;
4242
4243 // Do not set COMDAT attribute for CUDA/HIP stub functions to prevent
4244 // them being "merged" by the COMDAT Folding linker optimization.
4245 if (D.hasAttr<CUDAGlobalAttr>())
4246 return false;
4247
4248 if (D.hasAttr<SelectAnyAttr>())
4249 return true;
4250
4251 GVALinkage Linkage;
4252 if (auto *VD = dyn_cast<VarDecl>(&D))
4253 Linkage = CGM.getContext().GetGVALinkageForVariable(VD);
4254 else
4255 Linkage = CGM.getContext().GetGVALinkageForFunction(cast<FunctionDecl>(&D));
4256
4257 switch (Linkage) {
4258 case GVA_Internal:
4259 case GVA_AvailableExternally:
4260 case GVA_StrongExternal:
4261 return false;
4262 case GVA_DiscardableODR:
4263 case GVA_StrongODR:
4264 return true;
4265 }
4266 llvm_unreachable("No such linkage")::llvm::llvm_unreachable_internal("No such linkage", "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 4266)
;
4267}
4268
4269void CodeGenModule::maybeSetTrivialComdat(const Decl &D,
4270 llvm::GlobalObject &GO) {
4271 if (!shouldBeInCOMDAT(*this, D))
4272 return;
4273 GO.setComdat(TheModule.getOrInsertComdat(GO.getName()));
4274}
4275
4276/// Pass IsTentative as true if you want to create a tentative definition.
4277void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D,
4278 bool IsTentative) {
4279 // OpenCL global variables of sampler type are translated to function calls,
4280 // therefore no need to be translated.
4281 QualType ASTTy = D->getType();
4282 if (getLangOpts().OpenCL && ASTTy->isSamplerT())
4283 return;
4284
4285 // If this is OpenMP device, check if it is legal to emit this global
4286 // normally.
4287 if (LangOpts.OpenMPIsDevice && OpenMPRuntime &&
4288 OpenMPRuntime->emitTargetGlobalVariable(D))
4289 return;
4290
4291 llvm::TrackingVH<llvm::Constant> Init;
4292 bool NeedsGlobalCtor = false;
4293 bool NeedsGlobalDtor =
4294 D->needsDestruction(getContext()) == QualType::DK_cxx_destructor;
4295
4296 const VarDecl *InitDecl;
4297 const Expr *InitExpr = D->getAnyInitializer(InitDecl);
4298
4299 Optional<ConstantEmitter> emitter;
4300
4301 // CUDA E.2.4.1 "__shared__ variables cannot have an initialization
4302 // as part of their declaration." Sema has already checked for
4303 // error cases, so we just need to set Init to UndefValue.
4304 bool IsCUDASharedVar =
4305 getLangOpts().CUDAIsDevice && D->hasAttr<CUDASharedAttr>();
4306 // Shadows of initialized device-side global variables are also left
4307 // undefined.
4308 // Managed Variables should be initialized on both host side and device side.
4309 bool IsCUDAShadowVar =
4310 !getLangOpts().CUDAIsDevice && !D->hasAttr<HIPManagedAttr>() &&
4311 (D->hasAttr<CUDAConstantAttr>() || D->hasAttr<CUDADeviceAttr>() ||
4312 D->hasAttr<CUDASharedAttr>());
4313 bool IsCUDADeviceShadowVar =
4314 getLangOpts().CUDAIsDevice && !D->hasAttr<HIPManagedAttr>() &&
4315 (D->getType()->isCUDADeviceBuiltinSurfaceType() ||
4316 D->getType()->isCUDADeviceBuiltinTextureType());
4317 if (getLangOpts().CUDA &&
4318 (IsCUDASharedVar || IsCUDAShadowVar || IsCUDADeviceShadowVar))
4319 Init = llvm::UndefValue::get(getTypes().ConvertTypeForMem(ASTTy));
4320 else if (D->hasAttr<LoaderUninitializedAttr>())
4321 Init = llvm::UndefValue::get(getTypes().ConvertTypeForMem(ASTTy));
4322 else if (!InitExpr) {
4323 // This is a tentative definition; tentative definitions are
4324 // implicitly initialized with { 0 }.
4325 //
4326 // Note that tentative definitions are only emitted at the end of
4327 // a translation unit, so they should never have incomplete
4328 // type. In addition, EmitTentativeDefinition makes sure that we
4329 // never attempt to emit a tentative definition if a real one
4330 // exists. A use may still exists, however, so we still may need
4331 // to do a RAUW.
4332 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 4332, __extension__ __PRETTY_FUNCTION__))
;
4333 Init = EmitNullConstant(D->getType());
4334 } else {
4335 initializedGlobalDecl = GlobalDecl(D);
4336 emitter.emplace(*this);
4337 llvm::Constant *Initializer = emitter->tryEmitForInitializer(*InitDecl);
4338 if (!Initializer) {
4339 QualType T = InitExpr->getType();
4340 if (D->getType()->isReferenceType())
4341 T = D->getType();
4342
4343 if (getLangOpts().CPlusPlus) {
4344 Init = EmitNullConstant(T);
4345 NeedsGlobalCtor = true;
4346 } else {
4347 ErrorUnsupported(D, "static initializer");
4348 Init = llvm::UndefValue::get(getTypes().ConvertType(T));
4349 }
4350 } else {
4351 Init = Initializer;
4352 // We don't need an initializer, so remove the entry for the delayed
4353 // initializer position (just in case this entry was delayed) if we
4354 // also don't need to register a destructor.
4355 if (getLangOpts().CPlusPlus && !NeedsGlobalDtor)
4356 DelayedCXXInitPosition.erase(D);
4357 }
4358 }
4359
4360 llvm::Type* InitType = Init->getType();
4361 llvm::Constant *Entry =
4362 GetAddrOfGlobalVar(D, InitType, ForDefinition_t(!IsTentative));
4363
4364 // Strip off pointer casts if we got them.
4365 Entry = Entry->stripPointerCasts();
4366
4367 // Entry is now either a Function or GlobalVariable.
4368 auto *GV = dyn_cast<llvm::GlobalVariable>(Entry);
4369
4370 // We have a definition after a declaration with the wrong type.
4371 // We must make a new GlobalVariable* and update everything that used OldGV
4372 // (a declaration or tentative definition) with the new GlobalVariable*
4373 // (which will be a definition).
4374 //
4375 // This happens if there is a prototype for a global (e.g.
4376 // "extern int x[];") and then a definition of a different type (e.g.
4377 // "int x[10];"). This also happens when an initializer has a different type
4378 // from the type of the global (this happens with unions).
4379 if (!GV || GV->getValueType() != InitType ||
4380 GV->getType()->getAddressSpace() !=
4381 getContext().getTargetAddressSpace(GetGlobalVarAddressSpace(D))) {
4382
4383 // Move the old entry aside so that we'll create a new one.
4384 Entry->setName(StringRef());
4385
4386 // Make a new global with the correct type, this is now guaranteed to work.
4387 GV = cast<llvm::GlobalVariable>(
4388 GetAddrOfGlobalVar(D, InitType, ForDefinition_t(!IsTentative))
4389 ->stripPointerCasts());
4390
4391 // Replace all uses of the old global with the new global
4392 llvm::Constant *NewPtrForOldDecl =
4393 llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(GV,
4394 Entry->getType());
4395 Entry->replaceAllUsesWith(NewPtrForOldDecl);
4396
4397 // Erase the old global, since it is no longer used.
4398 cast<llvm::GlobalValue>(Entry)->eraseFromParent();
4399 }
4400
4401 MaybeHandleStaticInExternC(D, GV);
4402
4403 if (D->hasAttr<AnnotateAttr>())
4404 AddGlobalAnnotations(D, GV);
4405
4406 // Set the llvm linkage type as appropriate.
4407 llvm::GlobalValue::LinkageTypes Linkage =
4408 getLLVMLinkageVarDefinition(D, GV->isConstant());
4409
4410 // CUDA B.2.1 "The __device__ qualifier declares a variable that resides on
4411 // the device. [...]"
4412 // CUDA B.2.2 "The __constant__ qualifier, optionally used together with
4413 // __device__, declares a variable that: [...]
4414 // Is accessible from all the threads within the grid and from the host
4415 // through the runtime library (cudaGetSymbolAddress() / cudaGetSymbolSize()
4416 // / cudaMemcpyToSymbol() / cudaMemcpyFromSymbol())."
4417 if (GV && LangOpts.CUDA) {
4418 if (LangOpts.CUDAIsDevice) {
4419 if (Linkage != llvm::GlobalValue::InternalLinkage &&
4420 (D->hasAttr<CUDADeviceAttr>() || D->hasAttr<CUDAConstantAttr>()))
4421 GV->setExternallyInitialized(true);
4422 } else {
4423 getCUDARuntime().internalizeDeviceSideVar(D, Linkage);
4424 }
4425 getCUDARuntime().handleVarRegistration(D, *GV);
4426 }
4427
4428 GV->setInitializer(Init);
4429 if (emitter)
4430 emitter->finalize(GV);
4431
4432 // If it is safe to mark the global 'constant', do so now.
4433 GV->setConstant(!NeedsGlobalCtor && !NeedsGlobalDtor &&
4434 isTypeConstant(D->getType(), true));
4435
4436 // If it is in a read-only section, mark it 'constant'.
4437 if (const SectionAttr *SA = D->getAttr<SectionAttr>()) {
4438 const ASTContext::SectionInfo &SI = Context.SectionInfos[SA->getName()];
4439 if ((SI.SectionFlags & ASTContext::PSF_Write) == 0)
4440 GV->setConstant(true);
4441 }
4442
4443 GV->setAlignment(getContext().getDeclAlign(D).getAsAlign());
4444
4445 // On Darwin, unlike other Itanium C++ ABI platforms, the thread-wrapper
4446 // function is only defined alongside the variable, not also alongside
4447 // callers. Normally, all accesses to a thread_local go through the
4448 // thread-wrapper in order to ensure initialization has occurred, underlying
4449 // variable will never be used other than the thread-wrapper, so it can be
4450 // converted to internal linkage.
4451 //
4452 // However, if the variable has the 'constinit' attribute, it _can_ be
4453 // referenced directly, without calling the thread-wrapper, so the linkage
4454 // must not be changed.
4455 //
4456 // Additionally, if the variable isn't plain external linkage, e.g. if it's
4457 // weak or linkonce, the de-duplication semantics are important to preserve,
4458 // so we don't change the linkage.
4459 if (D->getTLSKind() == VarDecl::TLS_Dynamic &&
4460 Linkage == llvm::GlobalValue::ExternalLinkage &&
4461 Context.getTargetInfo().getTriple().isOSDarwin() &&
4462 !D->hasAttr<ConstInitAttr>())
4463 Linkage = llvm::GlobalValue::InternalLinkage;
4464
4465 GV->setLinkage(Linkage);
4466 if (D->hasAttr<DLLImportAttr>())
4467 GV->setDLLStorageClass(llvm::GlobalVariable::DLLImportStorageClass);
4468 else if (D->hasAttr<DLLExportAttr>())
4469 GV->setDLLStorageClass(llvm::GlobalVariable::DLLExportStorageClass);
4470 else
4471 GV->setDLLStorageClass(llvm::GlobalVariable::DefaultStorageClass);
4472
4473 if (Linkage == llvm::GlobalVariable::CommonLinkage) {
4474 // common vars aren't constant even if declared const.
4475 GV->setConstant(false);
4476 // Tentative definition of global variables may be initialized with
4477 // non-zero null pointers. In this case they should have weak linkage
4478 // since common linkage must have zero initializer and must not have
4479 // explicit section therefore cannot have non-zero initial value.
4480 if (!GV->getInitializer()->isNullValue())
4481 GV->setLinkage(llvm::GlobalVariable::WeakAnyLinkage);
4482 }
4483
4484 setNonAliasAttributes(D, GV);
4485
4486 if (D->getTLSKind() && !GV->isThreadLocal()) {
4487 if (D->getTLSKind() == VarDecl::TLS_Dynamic)
4488 CXXThreadLocals.push_back(D);
4489 setTLSMode(GV, *D);
4490 }
4491
4492 maybeSetTrivialComdat(*D, *GV);
4493
4494 // Emit the initializer function if necessary.
4495 if (NeedsGlobalCtor || NeedsGlobalDtor)
4496 EmitCXXGlobalVarDeclInitFunc(D, GV, NeedsGlobalCtor);
4497
4498 SanitizerMD->reportGlobalToASan(GV, *D, NeedsGlobalCtor);
4499
4500 // Emit global variable debug information.
4501 if (CGDebugInfo *DI = getModuleDebugInfo())
4502 if (getCodeGenOpts().hasReducedDebugInfo())
4503 DI->EmitGlobalVariable(GV, D);
4504}
4505
4506void CodeGenModule::EmitExternalVarDeclaration(const VarDecl *D) {
4507 if (CGDebugInfo *DI = getModuleDebugInfo())
4508 if (getCodeGenOpts().hasReducedDebugInfo()) {
4509 QualType ASTTy = D->getType();
4510 llvm::Type *Ty = getTypes().ConvertTypeForMem(D->getType());
4511 llvm::Constant *GV = GetOrCreateLLVMGlobal(
4512 D->getName(), Ty, getContext().getTargetAddressSpace(ASTTy), D);
4513 DI->EmitExternalVariable(
4514 cast<llvm::GlobalVariable>(GV->stripPointerCasts()), D);
4515 }
4516}
4517
4518static bool isVarDeclStrongDefinition(const ASTContext &Context,
4519 CodeGenModule &CGM, const VarDecl *D,
4520 bool NoCommon) {
4521 // Don't give variables common linkage if -fno-common was specified unless it
4522 // was overridden by a NoCommon attribute.
4523 if ((NoCommon || D->hasAttr<NoCommonAttr>()) && !D->hasAttr<CommonAttr>())
4524 return true;
4525
4526 // C11 6.9.2/2:
4527 // A declaration of an identifier for an object that has file scope without
4528 // an initializer, and without a storage-class specifier or with the
4529 // storage-class specifier static, constitutes a tentative definition.
4530 if (D->getInit() || D->hasExternalStorage())
4531 return true;
4532
4533 // A variable cannot be both common and exist in a section.
4534 if (D->hasAttr<SectionAttr>())
4535 return true;
4536
4537 // A variable cannot be both common and exist in a section.
4538 // We don't try to determine which is the right section in the front-end.
4539 // If no specialized section name is applicable, it will resort to default.
4540 if (D->hasAttr<PragmaClangBSSSectionAttr>() ||
4541 D->hasAttr<PragmaClangDataSectionAttr>() ||
4542 D->hasAttr<PragmaClangRelroSectionAttr>() ||
4543 D->hasAttr<PragmaClangRodataSectionAttr>())
4544 return true;
4545
4546 // Thread local vars aren't considered common linkage.
4547 if (D->getTLSKind())
4548 return true;
4549
4550 // Tentative definitions marked with WeakImportAttr are true definitions.
4551 if (D->hasAttr<WeakImportAttr>())
4552 return true;
4553
4554 // A variable cannot be both common and exist in a comdat.
4555 if (shouldBeInCOMDAT(CGM, *D))
4556 return true;
4557
4558 // Declarations with a required alignment do not have common linkage in MSVC
4559 // mode.
4560 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
4561 if (D->hasAttr<AlignedAttr>())
4562 return true;
4563 QualType VarType = D->getType();
4564 if (Context.isAlignmentRequired(VarType))
4565 return true;
4566
4567 if (const auto *RT = VarType->getAs<RecordType>()) {
4568 const RecordDecl *RD = RT->getDecl();
4569 for (const FieldDecl *FD : RD->fields()) {
4570 if (FD->isBitField())
4571 continue;
4572 if (FD->hasAttr<AlignedAttr>())
4573 return true;
4574 if (Context.isAlignmentRequired(FD->getType()))
4575 return true;
4576 }
4577 }
4578 }
4579
4580 // Microsoft's link.exe doesn't support alignments greater than 32 bytes for
4581 // common symbols, so symbols with greater alignment requirements cannot be
4582 // common.
4583 // Other COFF linkers (ld.bfd and LLD) support arbitrary power-of-two
4584 // alignments for common symbols via the aligncomm directive, so this
4585 // restriction only applies to MSVC environments.
4586 if (Context.getTargetInfo().getTriple().isKnownWindowsMSVCEnvironment() &&
4587 Context.getTypeAlignIfKnown(D->getType()) >
4588 Context.toBits(CharUnits::fromQuantity(32)))
4589 return true;
4590
4591 return false;
4592}
4593
4594llvm::GlobalValue::LinkageTypes CodeGenModule::getLLVMLinkageForDeclarator(
4595 const DeclaratorDecl *D, GVALinkage Linkage, bool IsConstantVariable) {
4596 if (Linkage == GVA_Internal)
4597 return llvm::Function::InternalLinkage;
4598
4599 if (D->hasAttr<WeakAttr>()) {
4600 if (IsConstantVariable)
4601 return llvm::GlobalVariable::WeakODRLinkage;
4602 else
4603 return llvm::GlobalVariable::WeakAnyLinkage;
4604 }
4605
4606 if (const auto *FD = D->getAsFunction())
4607 if (FD->isMultiVersion() && Linkage == GVA_AvailableExternally)
4608 return llvm::GlobalVariable::LinkOnceAnyLinkage;
4609
4610 // We are guaranteed to have a strong definition somewhere else,
4611 // so we can use available_externally linkage.
4612 if (Linkage == GVA_AvailableExternally)
4613 return llvm::GlobalValue::AvailableExternallyLinkage;
4614
4615 // Note that Apple's kernel linker doesn't support symbol
4616 // coalescing, so we need to avoid linkonce and weak linkages there.
4617 // Normally, this means we just map to internal, but for explicit
4618 // instantiations we'll map to external.
4619
4620 // In C++, the compiler has to emit a definition in every translation unit
4621 // that references the function. We should use linkonce_odr because
4622 // a) if all references in this translation unit are optimized away, we
4623 // don't need to codegen it. b) if the function persists, it needs to be
4624 // merged with other definitions. c) C++ has the ODR, so we know the
4625 // definition is dependable.
4626 if (Linkage == GVA_DiscardableODR)
4627 return !Context.getLangOpts().AppleKext ? llvm::Function::LinkOnceODRLinkage
4628 : llvm::Function::InternalLinkage;
4629
4630 // An explicit instantiation of a template has weak linkage, since
4631 // explicit instantiations can occur in multiple translation units
4632 // and must all be equivalent. However, we are not allowed to
4633 // throw away these explicit instantiations.
4634 //
4635 // CUDA/HIP: For -fno-gpu-rdc case, device code is limited to one TU,
4636 // so say that CUDA templates are either external (for kernels) or internal.
4637 // This lets llvm perform aggressive inter-procedural optimizations. For
4638 // -fgpu-rdc case, device function calls across multiple TU's are allowed,
4639 // therefore we need to follow the normal linkage paradigm.
4640 if (Linkage == GVA_StrongODR) {
4641 if (getLangOpts().AppleKext)
4642 return llvm::Function::ExternalLinkage;
4643 if (getLangOpts().CUDA && getLangOpts().CUDAIsDevice &&
4644 !getLangOpts().GPURelocatableDeviceCode)
4645 return D->hasAttr<CUDAGlobalAttr>() ? llvm::Function::ExternalLinkage
4646 : llvm::Function::InternalLinkage;
4647 return llvm::Function::WeakODRLinkage;
4648 }
4649
4650 // C++ doesn't have tentative definitions and thus cannot have common
4651 // linkage.
4652 if (!getLangOpts().CPlusPlus && isa<VarDecl>(D) &&
4653 !isVarDeclStrongDefinition(Context, *this, cast<VarDecl>(D),
4654 CodeGenOpts.NoCommon))
4655 return llvm::GlobalVariable::CommonLinkage;
4656
4657 // selectany symbols are externally visible, so use weak instead of
4658 // linkonce. MSVC optimizes away references to const selectany globals, so
4659 // all definitions should be the same and ODR linkage should be used.
4660 // http://msdn.microsoft.com/en-us/library/5tkz6s71.aspx
4661 if (D->hasAttr<SelectAnyAttr>())
4662 return llvm::GlobalVariable::WeakODRLinkage;
4663
4664 // Otherwise, we have strong external linkage.
4665 assert(Linkage == GVA_StrongExternal)(static_cast <bool> (Linkage == GVA_StrongExternal) ? void
(0) : __assert_fail ("Linkage == GVA_StrongExternal", "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 4665, __extension__ __PRETTY_FUNCTION__))
;
4666 return llvm::GlobalVariable::ExternalLinkage;
4667}
4668
4669llvm::GlobalValue::LinkageTypes CodeGenModule::getLLVMLinkageVarDefinition(
4670 const VarDecl *VD, bool IsConstant) {
4671 GVALinkage Linkage = getContext().GetGVALinkageForVariable(VD);
4672 return getLLVMLinkageForDeclarator(VD, Linkage, IsConstant);
4673}
4674
4675/// Replace the uses of a function that was declared with a non-proto type.
4676/// We want to silently drop extra arguments from call sites
4677static void replaceUsesOfNonProtoConstant(llvm::Constant *old,
4678 llvm::Function *newFn) {
4679 // Fast path.
4680 if (old->use_empty()) return;
4681
4682 llvm::Type *newRetTy = newFn->getReturnType();
4683 SmallVector<llvm::Value*, 4> newArgs;
4684
4685 for (llvm::Value::use_iterator ui = old->use_begin(), ue = old->use_end();
4686 ui != ue; ) {
4687 llvm::Value::use_iterator use = ui++; // Increment before the use is erased.
4688 llvm::User *user = use->getUser();
4689
4690 // Recognize and replace uses of bitcasts. Most calls to
4691 // unprototyped functions will use bitcasts.
4692 if (auto *bitcast = dyn_cast<llvm::ConstantExpr>(user)) {
4693 if (bitcast->getOpcode() == llvm::Instruction::BitCast)
4694 replaceUsesOfNonProtoConstant(bitcast, newFn);
4695 continue;
4696 }
4697
4698 // Recognize calls to the function.
4699 llvm::CallBase *callSite = dyn_cast<llvm::CallBase>(user);
4700 if (!callSite) continue;
4701 if (!callSite->isCallee(&*use))
4702 continue;
4703
4704 // If the return types don't match exactly, then we can't
4705 // transform this call unless it's dead.
4706 if (callSite->getType() != newRetTy && !callSite->use_empty())
4707 continue;
4708
4709 // Get the call site's attribute list.
4710 SmallVector<llvm::AttributeSet, 8> newArgAttrs;
4711 llvm::AttributeList oldAttrs = callSite->getAttributes();
4712
4713 // If the function was passed too few arguments, don't transform.
4714 unsigned newNumArgs = newFn->arg_size();
4715 if (callSite->arg_size() < newNumArgs)
4716 continue;
4717
4718 // If extra arguments were passed, we silently drop them.
4719 // If any of the types mismatch, we don't transform.
4720 unsigned argNo = 0;
4721 bool dontTransform = false;
4722 for (llvm::Argument &A : newFn->args()) {
4723 if (callSite->getArgOperand(argNo)->getType() != A.getType()) {
4724 dontTransform = true;
4725 break;
4726 }
4727
4728 // Add any parameter attributes.
4729 newArgAttrs.push_back(oldAttrs.getParamAttributes(argNo));
4730 argNo++;
4731 }
4732 if (dontTransform)
4733 continue;
4734
4735 // Okay, we can transform this. Create the new call instruction and copy
4736 // over the required information.
4737 newArgs.append(callSite->arg_begin(), callSite->arg_begin() + argNo);
4738
4739 // Copy over any operand bundles.
4740 SmallVector<llvm::OperandBundleDef, 1> newBundles;
4741 callSite->getOperandBundlesAsDefs(newBundles);
4742
4743 llvm::CallBase *newCall;
4744 if (dyn_cast<llvm::CallInst>(callSite)) {
4745 newCall =
4746 llvm::CallInst::Create(newFn, newArgs, newBundles, "", callSite);
4747 } else {
4748 auto *oldInvoke = cast<llvm::InvokeInst>(callSite);
4749 newCall = llvm::InvokeInst::Create(newFn, oldInvoke->getNormalDest(),
4750 oldInvoke->getUnwindDest(), newArgs,
4751 newBundles, "", callSite);
4752 }
4753 newArgs.clear(); // for the next iteration
4754
4755 if (!newCall->getType()->isVoidTy())
4756 newCall->takeName(callSite);
4757 newCall->setAttributes(llvm::AttributeList::get(
4758 newFn->getContext(), oldAttrs.getFnAttributes(),
4759 oldAttrs.getRetAttributes(), newArgAttrs));
4760 newCall->setCallingConv(callSite->getCallingConv());
4761
4762 // Finally, remove the old call, replacing any uses with the new one.
4763 if (!callSite->use_empty())
4764 callSite->replaceAllUsesWith(newCall);
4765
4766 // Copy debug location attached to CI.
4767 if (callSite->getDebugLoc())
4768 newCall->setDebugLoc(callSite->getDebugLoc());
4769
4770 callSite->eraseFromParent();
4771 }
4772}
4773
4774/// ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we
4775/// implement a function with no prototype, e.g. "int foo() {}". If there are
4776/// existing call uses of the old function in the module, this adjusts them to
4777/// call the new function directly.
4778///
4779/// This is not just a cleanup: the always_inline pass requires direct calls to
4780/// functions to be able to inline them. If there is a bitcast in the way, it
4781/// won't inline them. Instcombine normally deletes these calls, but it isn't
4782/// run at -O0.
4783static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old,
4784 llvm::Function *NewFn) {
4785 // If we're redefining a global as a function, don't transform it.
4786 if (!isa<llvm::Function>(Old)) return;
4787
4788 replaceUsesOfNonProtoConstant(Old, NewFn);
4789}
4790
4791void CodeGenModule::HandleCXXStaticMemberVarInstantiation(VarDecl *VD) {
4792 auto DK = VD->isThisDeclarationADefinition();
4793 if (DK == VarDecl::Definition && VD->hasAttr<DLLImportAttr>())
4794 return;
4795
4796 TemplateSpecializationKind TSK = VD->getTemplateSpecializationKind();
4797 // If we have a definition, this might be a deferred decl. If the
4798 // instantiation is explicit, make sure we emit it at the end.
4799 if (VD->getDefinition() && TSK == TSK_ExplicitInstantiationDefinition)
4800 GetAddrOfGlobalVar(VD);
4801
4802 EmitTopLevelDecl(VD);
4803}
4804
4805void CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD,
4806 llvm::GlobalValue *GV) {
4807 const auto *D = cast<FunctionDecl>(GD.getDecl());
4808
4809 // Compute the function info and LLVM type.
4810 const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD);
4811 llvm::FunctionType *Ty = getTypes().GetFunctionType(FI);
4812
4813 // Get or create the prototype for the function.
4814 if (!GV || (GV->getValueType() != Ty))
4815 GV = cast<llvm::GlobalValue>(GetAddrOfFunction(GD, Ty, /*ForVTable=*/false,
4816 /*DontDefer=*/true,
4817 ForDefinition));
4818
4819 // Already emitted.
4820 if (!GV->isDeclaration())
4821 return;
4822
4823 // We need to set linkage and visibility on the function before
4824 // generating code for it because various parts of IR generation
4825 // want to propagate this information down (e.g. to local static
4826 // declarations).
4827 auto *Fn = cast<llvm::Function>(GV);
4828 setFunctionLinkage(GD, Fn);
4829
4830 // FIXME: this is redundant with part of setFunctionDefinitionAttributes
4831 setGVProperties(Fn, GD);
4832
4833 MaybeHandleStaticInExternC(D, Fn);
4834
4835 maybeSetTrivialComdat(*D, *Fn);
4836
4837 // Set CodeGen attributes that represent floating point environment.
4838 setLLVMFunctionFEnvAttributes(D, Fn);
4839
4840 CodeGenFunction(*this).GenerateCode(GD, Fn, FI);
4841
4842 setNonAliasAttributes(GD, Fn);
4843 SetLLVMFunctionAttributesForDefinition(D, Fn);
4844
4845 if (const ConstructorAttr *CA = D->getAttr<ConstructorAttr>())
4846 AddGlobalCtor(Fn, CA->getPriority());
4847 if (const DestructorAttr *DA = D->getAttr<DestructorAttr>())
4848 AddGlobalDtor(Fn, DA->getPriority(), true);
4849 if (D->hasAttr<AnnotateAttr>())
4850 AddGlobalAnnotations(D, Fn);
4851}
4852
4853void CodeGenModule::EmitAliasDefinition(GlobalDecl GD) {
4854 const auto *D = cast<ValueDecl>(GD.getDecl());
4855 const AliasAttr *AA = D->getAttr<AliasAttr>();
4856 assert(AA && "Not an alias?")(static_cast <bool> (AA && "Not an alias?") ? void
(0) : __assert_fail ("AA && \"Not an alias?\"", "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 4856, __extension__ __PRETTY_FUNCTION__))
;
4857
4858 StringRef MangledName = getMangledName(GD);
4859
4860 if (AA->getAliasee() == MangledName) {
4861 Diags.Report(AA->getLocation(), diag::err_cyclic_alias) << 0;
4862 return;
4863 }
4864
4865 // If there is a definition in the module, then it wins over the alias.
4866 // This is dubious, but allow it to be safe. Just ignore the alias.
4867 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
4868 if (Entry && !Entry->isDeclaration())
4869 return;
4870
4871 Aliases.push_back(GD);
4872
4873 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType());
4874
4875 // Create a reference to the named value. This ensures that it is emitted
4876 // if a deferred decl.
4877 llvm::Constant *Aliasee;
4878 llvm::GlobalValue::LinkageTypes LT;
4879 if (isa<llvm::FunctionType>(DeclTy)) {
4880 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy, GD,
4881 /*ForVTable=*/false);
4882 LT = getFunctionLinkage(GD);
4883 } else {
4884 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(), DeclTy, 0,
4885 /*D=*/nullptr);
4886 if (const auto *VD = dyn_cast<VarDecl>(GD.getDecl()))
4887 LT = getLLVMLinkageVarDefinition(VD, D->getType().isConstQualified());
4888 else
4889 LT = getFunctionLinkage(GD);
4890 }
4891
4892 // Create the new alias itself, but don't set a name yet.
4893 unsigned AS = Aliasee->getType()->getPointerAddressSpace();
4894 auto *GA =
4895 llvm::GlobalAlias::create(DeclTy, AS, LT, "", Aliasee, &getModule());
4896
4897 if (Entry) {
4898 if (GA->getAliasee() == Entry) {
4899 Diags.Report(AA->getLocation(), diag::err_cyclic_alias) << 0;
4900 return;
4901 }
4902
4903 assert(Entry->isDeclaration())(static_cast <bool> (Entry->isDeclaration()) ? void (
0) : __assert_fail ("Entry->isDeclaration()", "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 4903, __extension__ __PRETTY_FUNCTION__))
;
4904
4905 // If there is a declaration in the module, then we had an extern followed
4906 // by the alias, as in:
4907 // extern int test6();
4908 // ...
4909 // int test6() __attribute__((alias("test7")));
4910 //
4911 // Remove it and replace uses of it with the alias.
4912 GA->takeName(Entry);
4913
4914 Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GA,
4915 Entry->getType()));
4916 Entry->eraseFromParent();
4917 } else {
4918 GA->setName(MangledName);
4919 }
4920
4921 // Set attributes which are particular to an alias; this is a
4922 // specialization of the attributes which may be set on a global
4923 // variable/function.
4924 if (D->hasAttr<WeakAttr>() || D->hasAttr<WeakRefAttr>() ||
4925 D->isWeakImported()) {
4926 GA->setLinkage(llvm::Function::WeakAnyLinkage);
4927 }
4928
4929 if (const auto *VD = dyn_cast<VarDecl>(D))
4930 if (VD->getTLSKind())
4931 setTLSMode(GA, *VD);
4932
4933 SetCommonAttributes(GD, GA);
4934}
4935
4936void CodeGenModule::emitIFuncDefinition(GlobalDecl GD) {
4937 const auto *D = cast<ValueDecl>(GD.getDecl());
4938 const IFuncAttr *IFA = D->getAttr<IFuncAttr>();
4939 assert(IFA && "Not an ifunc?")(static_cast <bool> (IFA && "Not an ifunc?") ? void
(0) : __assert_fail ("IFA && \"Not an ifunc?\"", "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 4939, __extension__ __PRETTY_FUNCTION__))
;
4940
4941 StringRef MangledName = getMangledName(GD);
4942
4943 if (IFA->getResolver() == MangledName) {
4944 Diags.Report(IFA->getLocation(), diag::err_cyclic_alias) << 1;
4945 return;
4946 }
4947
4948 // Report an error if some definition overrides ifunc.
4949 llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
4950 if (Entry && !Entry->isDeclaration()) {
4951 GlobalDecl OtherGD;
4952 if (lookupRepresentativeDecl(MangledName, OtherGD) &&
4953 DiagnosedConflictingDefinitions.insert(GD).second) {
4954 Diags.Report(D->getLocation(), diag::err_duplicate_mangled_name)
4955 << MangledName;
4956 Diags.Report(OtherGD.getDecl()->getLocation(),
4957 diag::note_previous_definition);
4958 }
4959 return;
4960 }
4961
4962 Aliases.push_back(GD);
4963
4964 llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType());
4965 llvm::Constant *Resolver =
4966 GetOrCreateLLVMFunction(IFA->getResolver(), DeclTy, GD,
4967 /*ForVTable=*/false);
4968 llvm::GlobalIFunc *GIF =
4969 llvm::GlobalIFunc::create(DeclTy, 0, llvm::Function::ExternalLinkage,
4970 "", Resolver, &getModule());
4971 if (Entry) {
4972 if (GIF->getResolver() == Entry) {
4973 Diags.Report(IFA->getLocation(), diag::err_cyclic_alias) << 1;
4974 return;
4975 }
4976 assert(Entry->isDeclaration())(static_cast <bool> (Entry->isDeclaration()) ? void (
0) : __assert_fail ("Entry->isDeclaration()", "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 4976, __extension__ __PRETTY_FUNCTION__))
;
4977
4978 // If there is a declaration in the module, then we had an extern followed
4979 // by the ifunc, as in:
4980 // extern int test();
4981 // ...
4982 // int test() __attribute__((ifunc("resolver")));
4983 //
4984 // Remove it and replace uses of it with the ifunc.
4985 GIF->takeName(Entry);
4986
4987 Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GIF,
4988 Entry->getType()));
4989 Entry->eraseFromParent();
4990 } else
4991 GIF->setName(MangledName);
4992
4993 SetCommonAttributes(GD, GIF);
4994}
4995
4996llvm::Function *CodeGenModule::getIntrinsic(unsigned IID,
4997 ArrayRef<llvm::Type*> Tys) {
4998 return llvm::Intrinsic::getDeclaration(&getModule(), (llvm::Intrinsic::ID)IID,
4999 Tys);
5000}
5001
5002static llvm::StringMapEntry<llvm::GlobalVariable *> &
5003GetConstantCFStringEntry(llvm::StringMap<llvm::GlobalVariable *> &Map,
5004 const StringLiteral *Literal, bool TargetIsLSB,
5005 bool &IsUTF16, unsigned &StringLength) {
5006 StringRef String = Literal->getString();
5007 unsigned NumBytes = String.size();
5008
5009 // Check for simple case.
5010 if (!Literal->containsNonAsciiOrNull()) {
5011 StringLength = NumBytes;
5012 return *Map.insert(std::make_pair(String, nullptr)).first;
5013 }
5014
5015 // Otherwise, convert the UTF8 literals into a string of shorts.
5016 IsUTF16 = true;
5017
5018 SmallVector<llvm::UTF16, 128> ToBuf(NumBytes + 1); // +1 for ending nulls.
5019 const llvm::UTF8 *FromPtr = (const llvm::UTF8 *)String.data();
5020 llvm::UTF16 *ToPtr = &ToBuf[0];
5021
5022 (void)llvm::ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes, &ToPtr,
5023 ToPtr + NumBytes, llvm::strictConversion);
5024
5025 // ConvertUTF8toUTF16 returns the length in ToPtr.
5026 StringLength = ToPtr - &ToBuf[0];
5027
5028 // Add an explicit null.
5029 *ToPtr = 0;
5030 return *Map.insert(std::make_pair(
5031 StringRef(reinterpret_cast<const char *>(ToBuf.data()),
5032 (StringLength + 1) * 2),
5033 nullptr)).first;
5034}
5035
5036ConstantAddress
5037CodeGenModule::GetAddrOfConstantCFString(const StringLiteral *Literal) {
5038 unsigned StringLength = 0;
5039 bool isUTF16 = false;
5040 llvm::StringMapEntry<llvm::GlobalVariable *> &Entry =
5041 GetConstantCFStringEntry(CFConstantStringMap, Literal,
5042 getDataLayout().isLittleEndian(), isUTF16,
5043 StringLength);
5044
5045 if (auto *C = Entry.second)
5046 return ConstantAddress(C, CharUnits::fromQuantity(C->getAlignment()));
5047
5048 llvm::Constant *Zero = llvm::Constant::getNullValue(Int32Ty);
5049 llvm::Constant *Zeros[] = { Zero, Zero };
5050
5051 const ASTContext &Context = getContext();
5052 const llvm::Triple &Triple = getTriple();
5053
5054 const auto CFRuntime = getLangOpts().CFRuntime;
5055 const bool IsSwiftABI =
5056 static_cast<unsigned>(CFRuntime) >=
5057 static_cast<unsigned>(LangOptions::CoreFoundationABI::Swift);
5058 const bool IsSwift4_1 = CFRuntime == LangOptions::CoreFoundationABI::Swift4_1;
5059
5060 // If we don't already have it, get __CFConstantStringClassReference.
5061 if (!CFConstantStringClassRef) {
5062 const char *CFConstantStringClassName = "__CFConstantStringClassReference";
5063 llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy);
5064 Ty = llvm::ArrayType::get(Ty, 0);
5065
5066 switch (CFRuntime) {
5067 default: break;
5068 case LangOptions::CoreFoundationABI::Swift: LLVM_FALLTHROUGH[[gnu::fallthrough]];
5069 case LangOptions::CoreFoundationABI::Swift5_0:
5070 CFConstantStringClassName =
5071 Triple.isOSDarwin() ? "$s15SwiftFoundation19_NSCFConstantStringCN"
5072 : "$s10Foundation19_NSCFConstantStringCN";
5073 Ty = IntPtrTy;
5074 break;
5075 case LangOptions::CoreFoundationABI::Swift4_2:
5076 CFConstantStringClassName =
5077 Triple.isOSDarwin() ? "$S15SwiftFoundation19_NSCFConstantStringCN"
5078 : "$S10Foundation19_NSCFConstantStringCN";
5079 Ty = IntPtrTy;
5080 break;
5081 case LangOptions::CoreFoundationABI::Swift4_1:
5082 CFConstantStringClassName =
5083 Triple.isOSDarwin() ? "__T015SwiftFoundation19_NSCFConstantStringCN"
5084 : "__T010Foundation19_NSCFConstantStringCN";
5085 Ty = IntPtrTy;
5086 break;
5087 }
5088
5089 llvm::Constant *C = CreateRuntimeVariable(Ty, CFConstantStringClassName);
5090
5091 if (Triple.isOSBinFormatELF() || Triple.isOSBinFormatCOFF()) {
5092 llvm::GlobalValue *GV = nullptr;
5093
5094 if ((GV = dyn_cast<llvm::GlobalValue>(C))) {
5095 IdentifierInfo &II = Context.Idents.get(GV->getName());
5096 TranslationUnitDecl *TUDecl = Context.getTranslationUnitDecl();
5097 DeclContext *DC = TranslationUnitDecl::castToDeclContext(TUDecl);
5098
5099 const VarDecl *VD = nullptr;
5100 for (const auto *Result : DC->lookup(&II))
5101 if ((VD = dyn_cast<VarDecl>(Result)))
5102 break;
5103
5104 if (Triple.isOSBinFormatELF()) {
5105 if (!VD)
5106 GV->setLinkage(llvm::GlobalValue::ExternalLinkage);
5107 } else {
5108 GV->setLinkage(llvm::GlobalValue::ExternalLinkage);
5109 if (!VD || !VD->hasAttr<DLLExportAttr>())
5110 GV->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
5111 else
5112 GV->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
5113 }
5114
5115 setDSOLocal(GV);
5116 }
5117 }
5118
5119 // Decay array -> ptr
5120 CFConstantStringClassRef =
5121 IsSwiftABI ? llvm::ConstantExpr::getPtrToInt(C, Ty)
5122 : llvm::ConstantExpr::getGetElementPtr(Ty, C, Zeros);
5123 }
5124
5125 QualType CFTy = Context.getCFConstantStringType();
5126
5127 auto *STy = cast<llvm::StructType>(getTypes().ConvertType(CFTy));
5128
5129 ConstantInitBuilder Builder(*this);
5130 auto Fields = Builder.beginStruct(STy);
5131
5132 // Class pointer.
5133 Fields.add(cast<llvm::ConstantExpr>(CFConstantStringClassRef));
5134
5135 // Flags.
5136 if (IsSwiftABI) {
5137 Fields.addInt(IntPtrTy, IsSwift4_1 ? 0x05 : 0x01);
5138 Fields.addInt(Int64Ty, isUTF16 ? 0x07d0 : 0x07c8);
5139 } else {
5140 Fields.addInt(IntTy, isUTF16 ? 0x07d0 : 0x07C8);
5141 }
5142
5143 // String pointer.
5144 llvm::Constant *C = nullptr;
5145 if (isUTF16) {
5146 auto Arr = llvm::makeArrayRef(
5147 reinterpret_cast<uint16_t *>(const_cast<char *>(Entry.first().data())),
5148 Entry.first().size() / 2);
5149 C = llvm::ConstantDataArray::get(VMContext, Arr);
5150 } else {
5151 C = llvm::ConstantDataArray::getString(VMContext, Entry.first());
5152 }
5153
5154 // Note: -fwritable-strings doesn't make the backing store strings of
5155 // CFStrings writable. (See <rdar://problem/10657500>)
5156 auto *GV =
5157 new llvm::GlobalVariable(getModule(), C->getType(), /*isConstant=*/true,
5158 llvm::GlobalValue::PrivateLinkage, C, ".str");
5159 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
5160 // Don't enforce the target's minimum global alignment, since the only use
5161 // of the string is via this class initializer.
5162 CharUnits Align = isUTF16 ? Context.getTypeAlignInChars(Context.ShortTy)
5163 : Context.getTypeAlignInChars(Context.CharTy);
5164 GV->setAlignment(Align.getAsAlign());
5165
5166 // FIXME: We set the section explicitly to avoid a bug in ld64 224.1.
5167 // Without it LLVM can merge the string with a non unnamed_addr one during
5168 // LTO. Doing that changes the section it ends in, which surprises ld64.
5169 if (Triple.isOSBinFormatMachO())
5170 GV->setSection(isUTF16 ? "__TEXT,__ustring"
5171 : "__TEXT,__cstring,cstring_literals");
5172 // Make sure the literal ends up in .rodata to allow for safe ICF and for
5173 // the static linker to adjust permissions to read-only later on.
5174 else if (Triple.isOSBinFormatELF())
5175 GV->setSection(".rodata");
5176
5177 // String.
5178 llvm::Constant *Str =
5179 llvm::ConstantExpr::getGetElementPtr(GV->getValueType(), GV, Zeros);
5180
5181 if (isUTF16)
5182 // Cast the UTF16 string to the correct type.
5183 Str = llvm::ConstantExpr::getBitCast(Str, Int8PtrTy);
5184 Fields.add(Str);
5185
5186 // String length.
5187 llvm::IntegerType *LengthTy =
5188 llvm::IntegerType::get(getModule().getContext(),
5189 Context.getTargetInfo().getLongWidth());
5190 if (IsSwiftABI) {
5191 if (CFRuntime == LangOptions::CoreFoundationABI::Swift4_1 ||
5192 CFRuntime == LangOptions::CoreFoundationABI::Swift4_2)
5193 LengthTy = Int32Ty;
5194 else
5195 LengthTy = IntPtrTy;
5196 }
5197 Fields.addInt(LengthTy, StringLength);
5198
5199 // Swift ABI requires 8-byte alignment to ensure that the _Atomic(uint64_t) is
5200 // properly aligned on 32-bit platforms.
5201 CharUnits Alignment =
5202 IsSwiftABI ? Context.toCharUnitsFromBits(64) : getPointerAlign();
5203
5204 // The struct.
5205 GV = Fields.finishAndCreateGlobal("_unnamed_cfstring_", Alignment,
5206 /*isConstant=*/false,
5207 llvm::GlobalVariable::PrivateLinkage);
5208 GV->addAttribute("objc_arc_inert");
5209 switch (Triple.getObjectFormat()) {
5210 case llvm::Triple::UnknownObjectFormat:
5211 llvm_unreachable("unknown file format")::llvm::llvm_unreachable_internal("unknown file format", "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 5211)
;
5212 case llvm::Triple::GOFF:
5213 llvm_unreachable("GOFF is not yet implemented")::llvm::llvm_unreachable_internal("GOFF is not yet implemented"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 5213)
;
5214 case llvm::Triple::XCOFF:
5215 llvm_unreachable("XCOFF is not yet implemented")::llvm::llvm_unreachable_internal("XCOFF is not yet implemented"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 5215)
;
5216 case llvm::Triple::COFF:
5217 case llvm::Triple::ELF:
5218 case llvm::Triple::Wasm:
5219 GV->setSection("cfstring");
5220 break;
5221 case llvm::Triple::MachO:
5222 GV->setSection("__DATA,__cfstring");
5223 break;
5224 }
5225 Entry.second = GV;
5226
5227 return ConstantAddress(GV, Alignment);
5228}
5229
5230bool CodeGenModule::getExpressionLocationsEnabled() const {
5231 return !CodeGenOpts.EmitCodeView || CodeGenOpts.DebugColumnInfo;
5232}
5233
5234QualType CodeGenModule::getObjCFastEnumerationStateType() {
5235 if (ObjCFastEnumerationStateType.isNull()) {
5236 RecordDecl *D = Context.buildImplicitRecord("__objcFastEnumerationState");
5237 D->startDefinition();
5238
5239 QualType FieldTypes[] = {
5240 Context.UnsignedLongTy,
5241 Context.getPointerType(Context.getObjCIdType()),
5242 Context.getPointerType(Context.UnsignedLongTy),
5243 Context.getConstantArrayType(Context.UnsignedLongTy,
5244 llvm::APInt(32, 5), nullptr, ArrayType::Normal, 0)
5245 };
5246
5247 for (size_t i = 0; i < 4; ++i) {
5248 FieldDecl *Field = FieldDecl::Create(Context,
5249 D,
5250 SourceLocation(),
5251 SourceLocation(), nullptr,
5252 FieldTypes[i], /*TInfo=*/nullptr,
5253 /*BitWidth=*/nullptr,
5254 /*Mutable=*/false,
5255 ICIS_NoInit);
5256 Field->setAccess(AS_public);
5257 D->addDecl(Field);
5258 }
5259
5260 D->completeDefinition();
5261 ObjCFastEnumerationStateType = Context.getTagDeclType(D);
5262 }
5263
5264 return ObjCFastEnumerationStateType;
5265}
5266
5267llvm::Constant *
5268CodeGenModule::GetConstantArrayFromStringLiteral(const StringLiteral *E) {
5269 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 5269, __extension__ __PRETTY_FUNCTION__))
;
5270
5271 // Don't emit it as the address of the string, emit the string data itself
5272 // as an inline array.
5273 if (E->getCharByteWidth() == 1) {
5274 SmallString<64> Str(E->getString());
5275
5276 // Resize the string to the right size, which is indicated by its type.
5277 const ConstantArrayType *CAT = Context.getAsConstantArrayType(E->getType());
5278 Str.resize(CAT->getSize().getZExtValue());
5279 return llvm::ConstantDataArray::getString(VMContext, Str, false);
5280 }
5281
5282 auto *AType = cast<llvm::ArrayType>(getTypes().ConvertType(E->getType()));
5283 llvm::Type *ElemTy = AType->getElementType();
5284 unsigned NumElements = AType->getNumElements();
5285
5286 // Wide strings have either 2-byte or 4-byte elements.
5287 if (ElemTy->getPrimitiveSizeInBits() == 16) {
5288 SmallVector<uint16_t, 32> Elements;
5289 Elements.reserve(NumElements);
5290
5291 for(unsigned i = 0, e = E->getLength(); i != e; ++i)
5292 Elements.push_back(E->getCodeUnit(i));
5293 Elements.resize(NumElements);
5294 return llvm::ConstantDataArray::get(VMContext, Elements);
5295 }
5296
5297 assert(ElemTy->getPrimitiveSizeInBits() == 32)(static_cast <bool> (ElemTy->getPrimitiveSizeInBits(
) == 32) ? void (0) : __assert_fail ("ElemTy->getPrimitiveSizeInBits() == 32"
, "/build/llvm-toolchain-snapshot-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 5297, __extension__ __PRETTY_FUNCTION__))
;
5298 SmallVector<uint32_t, 32> Elements;
5299 Elements.reserve(NumElements);
5300
5301 for(unsigned i = 0, e = E->getLength(); i != e; ++i)
5302 Elements.push_back(E->getCodeUnit(i));
5303 Elements.resize(NumElements);
5304 return llvm::ConstantDataArray::get(VMContext, Elements);
5305}
5306
5307static llvm::GlobalVariable *
5308GenerateStringLiteral(llvm::Constant *C, llvm::GlobalValue::LinkageTypes LT,
5309 CodeGenModule &CGM, StringRef GlobalName,
5310 CharUnits Alignment) {
5311 unsigned AddrSpace = CGM.getContext().getTargetAddressSpace(
5312 CGM.GetGlobalConstantAddressSpace());
5313
5314 llvm::Module &M = CGM.getModule();
5315 // Create a global variable for this string
5316 auto *GV = new llvm::GlobalVariable(
5317 M, C->getType(), !CGM.getLangOpts().WritableStrings, LT, C, GlobalName,
5318 nullptr, llvm::GlobalVariable::NotThreadLocal, AddrSpace);
5319 GV->setAlignment(Alignment.getAsAlign());
5320 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
5321 if (GV->isWeakForLinker()) {
5322 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 5322, __extension__ __PRETTY_FUNCTION__))
;
5323 GV->setComdat(M.getOrInsertComdat(GV->getName()));
5324 }
5325 CGM.setDSOLocal(GV);
5326
5327 return GV;
5328}
5329
5330/// GetAddrOfConstantStringFromLiteral - Return a pointer to a
5331/// constant array for the given string literal.
5332ConstantAddress
5333CodeGenModule::GetAddrOfConstantStringFromLiteral(const StringLiteral *S,
5334 StringRef Name) {
5335 CharUnits Alignment = getContext().getAlignOfGlobalVarInChars(S->getType());
5336
5337 llvm::Constant *C = GetConstantArrayFromStringLiteral(S);
5338 llvm::GlobalVariable **Entry = nullptr;
5339 if (!LangOpts.WritableStrings) {
5340 Entry = &ConstantStringMap[C];
5341 if (auto GV = *Entry) {
5342 if (Alignment.getQuantity() > GV->getAlignment())
5343 GV->setAlignment(Alignment.getAsAlign());
5344 return ConstantAddress(castStringLiteralToDefaultAddressSpace(*this, GV),
5345 Alignment);
5346 }
5347 }
5348
5349 SmallString<256> MangledNameBuffer;
5350 StringRef GlobalVariableName;
5351 llvm::GlobalValue::LinkageTypes LT;
5352
5353 // Mangle the string literal if that's how the ABI merges duplicate strings.
5354 // Don't do it if they are writable, since we don't want writes in one TU to
5355 // affect strings in another.
5356 if (getCXXABI().getMangleContext().shouldMangleStringLiteral(S) &&
5357 !LangOpts.WritableStrings) {
5358 llvm::raw_svector_ostream Out(MangledNameBuffer);
5359 getCXXABI().getMangleContext().mangleStringLiteral(S, Out);
5360 LT = llvm::GlobalValue::LinkOnceODRLinkage;
5361 GlobalVariableName = MangledNameBuffer;
5362 } else {
5363 LT = llvm::GlobalValue::PrivateLinkage;
5364 GlobalVariableName = Name;
5365 }
5366
5367 auto GV = GenerateStringLiteral(C, LT, *this, GlobalVariableName, Alignment);
5368 if (Entry)
5369 *Entry = GV;
5370
5371 SanitizerMD->reportGlobalToASan(GV, S->getStrTokenLoc(0), "<string literal>",
5372 QualType());
5373
5374 return ConstantAddress(castStringLiteralToDefaultAddressSpace(*this, GV),
5375 Alignment);
5376}
5377
5378/// GetAddrOfConstantStringFromObjCEncode - Return a pointer to a constant
5379/// array for the given ObjCEncodeExpr node.
5380ConstantAddress
5381CodeGenModule::GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *E) {
5382 std::string Str;
5383 getContext().getObjCEncodingForType(E->getEncodedType(), Str);
5384
5385 return GetAddrOfConstantCString(Str);
5386}
5387
5388/// GetAddrOfConstantCString - Returns a pointer to a character array containing
5389/// the literal and a terminating '\0' character.
5390/// The result has pointer to array type.
5391ConstantAddress CodeGenModule::GetAddrOfConstantCString(
5392 const std::string &Str, const char *GlobalName) {
5393 StringRef StrWithNull(Str.c_str(), Str.size() + 1);
5394 CharUnits Alignment =
5395 getContext().getAlignOfGlobalVarInChars(getContext().CharTy);
5396
5397 llvm::Constant *C =
5398 llvm::ConstantDataArray::getString(getLLVMContext(), StrWithNull, false);
5399
5400 // Don't share any string literals if strings aren't constant.
5401 llvm::GlobalVariable **Entry = nullptr;
5402 if (!LangOpts.WritableStrings) {
5403 Entry = &ConstantStringMap[C];
5404 if (auto GV = *Entry) {
5405 if (Alignment.getQuantity() > GV->getAlignment())
5406 GV->setAlignment(Alignment.getAsAlign());
5407 return ConstantAddress(castStringLiteralToDefaultAddressSpace(*this, GV),
5408 Alignment);
5409 }
5410 }
5411
5412 // Get the default prefix if a name wasn't specified.
5413 if (!GlobalName)
5414 GlobalName = ".str";
5415 // Create a global variable for this.
5416 auto GV = GenerateStringLiteral(C, llvm::GlobalValue::PrivateLinkage, *this,
5417 GlobalName, Alignment);
5418 if (Entry)
5419 *Entry = GV;
5420
5421 return ConstantAddress(castStringLiteralToDefaultAddressSpace(*this, GV),
5422 Alignment);
5423}
5424
5425ConstantAddress CodeGenModule::GetAddrOfGlobalTemporary(
5426 const MaterializeTemporaryExpr *E, const Expr *Init) {
5427 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 5428, __extension__ __PRETTY_FUNCTION__))
5428 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-13~++20210616111117+5c1639fe064b/clang/lib/CodeGen/CodeGenModule.cpp"
, 5428, __extension__ __PRETTY_FUNCTION__))
;
5429 const auto *VD = cast<VarDecl>(E->getExtendingDecl());
5430
5431 // If we're not materializing a subobject of the temporary, keep the
5432 // cv-qualifiers from the type of the MaterializeTemporaryExpr.
5433 QualType MaterializedType = Init->getType();
5434 if (Init == E->getSubExpr())
5435 MaterializedType = E->getType();
5436
5437 CharUnits Align = getContext().getTypeAlignInChars(MaterializedType);
5438
5439 auto InsertResult = MaterializedGlobalTemporaryMap.insert({E, nullptr});
5440 if (!InsertResult.second) {
5441 // We've seen this before: either we already created it or we're in the
5442 // process of doing so.
5443 if (!InsertResult.first->second) {
5444 // We recursively re-entered this function, probably during emission of
5445 // the initializer. Create a placeholder. We'll clean this up in the
5446 // outer call, at the end of this function.
5447 llvm::Type *Type = getTypes().ConvertTypeForMem(MaterializedType);
5448 InsertResult.first->second = new llvm::GlobalVariable(
5449 getModule(), Type, false, llvm::GlobalVariable::InternalLinkage,
5450 nullptr);
5451 }
5452 return ConstantAddress(InsertResult.first->second, Align);
5453 }
5454
5455 // FIXME: If an externally-visible declaration extends multiple temporaries,
5456 // we need to give each temporary the same name in every translation unit (and
5457 // we also need to make the temporaries externally-visible).
5458 SmallString<256> Name;
5459 llvm::raw_svector_ostream Out(Name);
5460 getCXXABI().getMangleContext().mangleReferenceTemporary(
5461 VD, E->getManglingNumber(), Out);
5462
5463 APValue *Value = nullptr;
5464 if (E->getStorageDuration() == SD_Static && VD && VD->evaluateValue()) {
5465 // If the initializer of the extending declaration is a constant
5466 // initializer, we should have a cached constant initializer for this
5467 // temporary. Note that this might have a different value from the value
5468 // computed by evaluating the initializer if the surrounding constant
5469 // expression modifies the temporary.
5470 Value = E->getOrCreateValue(false);
5471 }
5472
5473 // Try evaluating it now, it might have a constant initializer.
5474 Expr::EvalResult EvalResult;
5475 if (!Value && Init->EvaluateAsRValue(EvalResult, getContext()) &&
5476 !EvalResult.hasSideEffects())
5477 Value = &EvalResult.Val;
5478
5479 LangAS AddrSpace =
5480 VD ? GetGlobalVarAddressSpace(VD) : MaterializedType.getAddressSpace();
5481
5482 Optional<ConstantEmitter> emitter;
5483 llvm::Constant *InitialValue = nullptr;
5484 bool Constant = false;
5485 llvm::Type *Type;
5486 if (Value) {
5487 // The temporary has a constant initializer, use it.
5488 emitter.emplace(*this);
5489 InitialValue = emitter->emitForInitializer(*Value, AddrSpace,
5490 MaterializedType);
5491 Constant = isTypeConstant(MaterializedType, /*ExcludeCtor*/Value);
5492 Type = InitialValue->getType();
5493 } else {
5494 // No initializer, the initialization will be provided when we
5495 // initialize the declaration which performed lifetime extension.
5496 Type = getTypes().ConvertTypeForMem(MaterializedType);
5497 }
5498
5499 // Create a global variable for this lifetime-extended temporary.
5500 llvm::GlobalValue::LinkageTypes Linkage =
5501 getLLVMLinkageVarDefinition(VD, Constant);
5502 if (Linkage == llvm::GlobalVariable::ExternalLinkage) {
5503 const VarDecl *InitVD;
5504 if (VD->isStaticDataMember() && VD->getAnyInitializer(InitVD) &&
5505 isa<CXXRecordDecl>(InitVD->getLexicalDeclContext())) {
5506 // Temporaries defined inside a class get linkonce_odr linkage because the
5507 // class can be defined in multiple translation units.
5508 Linkage = llvm::GlobalVariable::LinkOnceODRLinkage;
5509 } else {
5510 // There is no need for this temporary to have external linkage if the
5511 // VarDecl has external linkage.
5512 Linkage = llvm::GlobalVariable::InternalLinkage;
5513 }
5514 }
5515 auto TargetAS = getContext().getTargetAddressSpace(AddrSpace);
5516 auto *GV = new llvm::GlobalVariable(
5517 getModule(), Type, Constant, Linkage, InitialValue, Name.c_str(),
5518 /*InsertBefore=*/nullptr, llvm::GlobalVariable::NotThreadLocal, TargetAS);
5519 if (emitter) emitter->finalize(GV);
5520 setGVProperties(GV, VD);
5521 GV->setAlignment(Align.getAsAlign());
5522 if (supportsCOMDAT() && GV->isWeakForLinker())
5523 GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
5524 if (VD->getTLSKind())
5525 setTLSMode(GV, *VD);
5526 llvm::Constant *CV = GV;
5527 if (AddrSpace != LangAS::Default)
5528 CV = getTargetCodeGenInfo().performAddrSpaceCast(
5529 *this, GV, AddrSpace, LangAS::Default,
5530 Type->getPointerTo(
5531 getContext().getTargetAddressSpace(LangAS::Default)));
5532
5533 // Update the map with the new temporary. If we created a placeholder above,
5534 // replace it with the new global now.
5535 llvm::Constant *&Entry = MaterializedGlobalTemporaryMap[E];
5536 if (Entry) {
5537 Entry->replaceAllUsesWith(
5538 llvm::ConstantExpr::getBitCast(CV, Entry->getType()));
5539 llvm::cast<llvm::GlobalVariable>(Entry)->eraseFromParent();
5540 }
5541 Entry = CV;
5542
5543 return ConstantAddress(CV, Align);
5544}
5545
5546/// EmitObjCPropertyImplementations - Emit information for synthesized
5547/// properties for an implementation.
5548void CodeGenModule::EmitObjCPropertyImplementations(const
5549 ObjCImplementationDecl *D) {
5550 for (const auto *PID : D->property_impls()) {
5551 // Dynamic is just for type-checking.
5552 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) {
5553 ObjCPropertyDecl *PD = PID->getPropertyDecl();
5554
5555 // Determine which methods need to be implemented, some may have
5556 // been overridden. Note that ::isPropertyAccessor is not the method
5557 // we want, that just indicates if the decl came from a
5558 // property. What we want to know is if the method is defined in
5559 // this implementation.
5560 auto *Getter = PID->getGetterMethodDecl();
5561 if (!Getter || Getter->isSynthesizedAccessorStub())
5562 CodeGenFunction(*this).GenerateObjCGetter(
5563 const_cast<ObjCImplementationDecl *>(D), PID);
5564 auto *Setter = PID->getSetterMethodDecl();
5565 if (!PD->isReadOnly() && (!Setter || Setter->isSynthesizedAccessorStub()))
5566 CodeGenFunction(*this).GenerateObjCSetter(
5567 const_cast<ObjCImplementationDecl *>(D), PID);
5568 }
5569 }
5570}
5571
5572static bool needsDestructMethod(ObjCImplementationDecl *impl) {
5573 const ObjCInterfaceDecl *iface = impl->getClassInterface();
5574 for (const ObjCIvarDecl *ivar = iface->all_declared_ivar_begin();
5575 ivar; ivar = ivar->getNextIvar())
5576 if (ivar->getType().isDestructedType())
5577 return true;
5578
5579 return false;
5580}
5581
5582static bool AllTrivialInitializers(CodeGenModule &CGM,
5583 ObjCImplementationDecl *D) {
5584 CodeGenFunction CGF(CGM);
5585 for (ObjCImplementationDecl::init_iterator B = D->init_begin(),
5586 E = D->init_end(); B != E; ++B) {
5587 CXXCtorInitializer *CtorInitExp = *B;
5588 Expr *Init = CtorInitExp->getInit();
5589 if (!CGF.isTrivialInitializer(Init))
5590 return false;
5591 }
5592 return true;
5593}
5594
5595/// EmitObjCIvarInitializations - Emit information for ivar initialization
5596/// for an implementation.
5597void CodeGenModule::EmitObjCIvarInitializations(ObjCImplementationDecl *D) {
5598 // We might need a .cxx_destruct even if we don't have any ivar initializers.
5599 if (needsDestructMethod(D)) {
5600 IdentifierInfo *II = &getContext().Idents.get(".cxx_destruct");
5601 Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
5602 ObjCMethodDecl *DTORMethod = ObjCMethodDecl::Create(
5603 getContext(), D->getLocation(), D->getLocation(), cxxSelector,
5604 getContext().VoidTy, nullptr, D,
5605 /*isInstance=*/true, /*isVariadic=*/false,
5606 /*isPropertyAccessor=*/true, /*isSynthesizedAccessorStub=*/false,
5607 /*isImplicitlyDeclared=*/true,
5608 /*isDefined=*/false, ObjCMethodDecl::Required);
5609 D->addInstanceMethod(DTORMethod);
5610 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, DTORMethod, false);
5611 D->setHasDestructors(true);
5612 }
5613
5614 // If the implementation doesn't have any ivar initializers, we don't need
5615 // a .cxx_construct.
5616 if (D->getNumIvarInitializers() == 0 ||
5617 AllTrivialInitializers(*this, D))
5618 return;
5619
5620 IdentifierInfo *II = &getContext().Idents.get(".cxx_construct");
5621 Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
5622 // The constructor returns 'self'.
5623 ObjCMethodDecl *CTORMethod = ObjCMethodDecl::Create(
5624 getContext(), D->getLocation(), D->getLocation(), cxxSelector,
5625 getContext().getObjCIdType(), nullptr, D, /*isInstance=*/true,
5626 /*isVariadic=*/false,
5627 /*isPropertyAccessor=*/true, /*isSynthesizedAccessorStub=*/false,
5628 /*isImplicitlyDeclared=*/true,
5629 /*isDefined=*/false, ObjCMethodDecl::Required);
5630 D->addInstanceMethod(CTORMethod);
5631 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, CTORMethod, true);
5632 D->setHasNonZeroConstructors(true);
5633}
5634
5635// EmitLinkageSpec - Emit all declarations in a linkage spec.
5636void CodeGenModule::EmitLinkageSpec(const LinkageSpecDecl *LSD) {
5637 if (LSD->getLanguage() != LinkageSpecDecl::lang_c &&
5638 LSD->getLanguage() != LinkageSpecDecl::lang_cxx) {
5639 ErrorUnsupported(LSD, "linkage spec");
5640 return;
5641 }
5642
5643 EmitDeclContext(LSD);
5644}
5645
5646void CodeGenModule::EmitDeclContext(const DeclContext *DC) {
5647 for (auto *I : DC->decls()) {
5648 // Unlike other DeclContexts, the contents of an ObjCImplDecl at TU scope
5649 // are themselves considered "top-level", so EmitTopLevelDecl on an
5650 // ObjCImplDecl does not recursively visit them. We need to do that in
5651 // case they're nested inside another construct (LinkageSpecDecl /
5652 // ExportDecl) that does stop them from being considered "top-level".
5653 if (auto *OID = dyn_cast<ObjCImplDecl>(I)) {
5654 for (auto *M : OID->methods())
5655 EmitTopLevelDecl(M);
5656 }
5657
5658 EmitTopLevelDecl(I);
5659 }
5660}
5661
5662/// EmitTopLevelDecl - Emit code for a single top level declaration.
5663void CodeGenModule::EmitTopLevelDecl(Decl *D) {
5664 // Ignore dependent declarations.
5665 if (D->isTemplated())
5666 return;
5667
5668 // Consteval function shouldn't be emitted.
5669 if (auto *FD = dyn_cast<FunctionDecl>(D))
5670