| File: | build/source/clang/lib/CodeGen/CodeGenModule.cpp |
| Warning: | line 6085, column 9 Called C++ object pointer is null |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
| 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 "ABIInfo.h" |
| 15 | #include "CGBlocks.h" |
| 16 | #include "CGCUDARuntime.h" |
| 17 | #include "CGCXXABI.h" |
| 18 | #include "CGCall.h" |
| 19 | #include "CGDebugInfo.h" |
| 20 | #include "CGHLSLRuntime.h" |
| 21 | #include "CGObjCRuntime.h" |
| 22 | #include "CGOpenCLRuntime.h" |
| 23 | #include "CGOpenMPRuntime.h" |
| 24 | #include "CGOpenMPRuntimeGPU.h" |
| 25 | #include "CodeGenFunction.h" |
| 26 | #include "CodeGenPGO.h" |
| 27 | #include "ConstantEmitter.h" |
| 28 | #include "CoverageMappingGen.h" |
| 29 | #include "TargetInfo.h" |
| 30 | #include "clang/AST/ASTContext.h" |
| 31 | #include "clang/AST/CharUnits.h" |
| 32 | #include "clang/AST/DeclCXX.h" |
| 33 | #include "clang/AST/DeclObjC.h" |
| 34 | #include "clang/AST/DeclTemplate.h" |
| 35 | #include "clang/AST/Mangle.h" |
| 36 | #include "clang/AST/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/BackendUtil.h" |
| 48 | #include "clang/CodeGen/ConstantInitBuilder.h" |
| 49 | #include "clang/Frontend/FrontendDiagnostic.h" |
| 50 | #include "llvm/ADT/STLExtras.h" |
| 51 | #include "llvm/ADT/StringExtras.h" |
| 52 | #include "llvm/ADT/StringSwitch.h" |
| 53 | #include "llvm/ADT/Triple.h" |
| 54 | #include "llvm/Analysis/TargetLibraryInfo.h" |
| 55 | #include "llvm/Frontend/OpenMP/OMPIRBuilder.h" |
| 56 | #include "llvm/IR/CallingConv.h" |
| 57 | #include "llvm/IR/DataLayout.h" |
| 58 | #include "llvm/IR/Intrinsics.h" |
| 59 | #include "llvm/IR/LLVMContext.h" |
| 60 | #include "llvm/IR/Module.h" |
| 61 | #include "llvm/IR/ProfileSummary.h" |
| 62 | #include "llvm/ProfileData/InstrProfReader.h" |
| 63 | #include "llvm/ProfileData/SampleProf.h" |
| 64 | #include "llvm/Support/CRC.h" |
| 65 | #include "llvm/Support/CodeGen.h" |
| 66 | #include "llvm/Support/CommandLine.h" |
| 67 | #include "llvm/Support/ConvertUTF.h" |
| 68 | #include "llvm/Support/ErrorHandling.h" |
| 69 | #include "llvm/Support/TimeProfiler.h" |
| 70 | #include "llvm/Support/X86TargetParser.h" |
| 71 | #include "llvm/Support/xxhash.h" |
| 72 | #include <optional> |
| 73 | |
| 74 | using namespace clang; |
| 75 | using namespace CodeGen; |
| 76 | |
| 77 | static llvm::cl::opt<bool> LimitedCoverage( |
| 78 | "limited-coverage-experimental", llvm::cl::Hidden, |
| 79 | llvm::cl::desc("Emit limited coverage mapping information (experimental)")); |
| 80 | |
| 81 | static const char AnnotationSection[] = "llvm.metadata"; |
| 82 | |
| 83 | static CGCXXABI *createCXXABI(CodeGenModule &CGM) { |
| 84 | switch (CGM.getContext().getCXXABIKind()) { |
| 85 | case TargetCXXABI::AppleARM64: |
| 86 | case TargetCXXABI::Fuchsia: |
| 87 | case TargetCXXABI::GenericAArch64: |
| 88 | case TargetCXXABI::GenericARM: |
| 89 | case TargetCXXABI::iOS: |
| 90 | case TargetCXXABI::WatchOS: |
| 91 | case TargetCXXABI::GenericMIPS: |
| 92 | case TargetCXXABI::GenericItanium: |
| 93 | case TargetCXXABI::WebAssembly: |
| 94 | case TargetCXXABI::XL: |
| 95 | return CreateItaniumCXXABI(CGM); |
| 96 | case TargetCXXABI::Microsoft: |
| 97 | return CreateMicrosoftCXXABI(CGM); |
| 98 | } |
| 99 | |
| 100 | llvm_unreachable("invalid C++ ABI kind")::llvm::llvm_unreachable_internal("invalid C++ ABI kind", "clang/lib/CodeGen/CodeGenModule.cpp" , 100); |
| 101 | } |
| 102 | |
| 103 | CodeGenModule::CodeGenModule(ASTContext &C, |
| 104 | IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS, |
| 105 | const HeaderSearchOptions &HSO, |
| 106 | const PreprocessorOptions &PPO, |
| 107 | const CodeGenOptions &CGO, llvm::Module &M, |
| 108 | DiagnosticsEngine &diags, |
| 109 | CoverageSourceInfo *CoverageInfo) |
| 110 | : Context(C), LangOpts(C.getLangOpts()), FS(FS), HeaderSearchOpts(HSO), |
| 111 | PreprocessorOpts(PPO), CodeGenOpts(CGO), TheModule(M), Diags(diags), |
| 112 | Target(C.getTargetInfo()), ABI(createCXXABI(*this)), |
| 113 | VMContext(M.getContext()), Types(*this), VTables(*this), |
| 114 | SanitizerMD(new SanitizerMetadata(*this)) { |
| 115 | |
| 116 | // Initialize the type cache. |
| 117 | llvm::LLVMContext &LLVMContext = M.getContext(); |
| 118 | VoidTy = llvm::Type::getVoidTy(LLVMContext); |
| 119 | Int8Ty = llvm::Type::getInt8Ty(LLVMContext); |
| 120 | Int16Ty = llvm::Type::getInt16Ty(LLVMContext); |
| 121 | Int32Ty = llvm::Type::getInt32Ty(LLVMContext); |
| 122 | Int64Ty = llvm::Type::getInt64Ty(LLVMContext); |
| 123 | HalfTy = llvm::Type::getHalfTy(LLVMContext); |
| 124 | BFloatTy = llvm::Type::getBFloatTy(LLVMContext); |
| 125 | FloatTy = llvm::Type::getFloatTy(LLVMContext); |
| 126 | DoubleTy = llvm::Type::getDoubleTy(LLVMContext); |
| 127 | PointerWidthInBits = C.getTargetInfo().getPointerWidth(LangAS::Default); |
| 128 | PointerAlignInBytes = |
| 129 | C.toCharUnitsFromBits(C.getTargetInfo().getPointerAlign(LangAS::Default)) |
| 130 | .getQuantity(); |
| 131 | SizeSizeInBytes = |
| 132 | C.toCharUnitsFromBits(C.getTargetInfo().getMaxPointerWidth()).getQuantity(); |
| 133 | IntAlignInBytes = |
| 134 | C.toCharUnitsFromBits(C.getTargetInfo().getIntAlign()).getQuantity(); |
| 135 | CharTy = |
| 136 | llvm::IntegerType::get(LLVMContext, C.getTargetInfo().getCharWidth()); |
| 137 | IntTy = llvm::IntegerType::get(LLVMContext, C.getTargetInfo().getIntWidth()); |
| 138 | IntPtrTy = llvm::IntegerType::get(LLVMContext, |
| 139 | C.getTargetInfo().getMaxPointerWidth()); |
| 140 | Int8PtrTy = Int8Ty->getPointerTo(0); |
| 141 | Int8PtrPtrTy = Int8PtrTy->getPointerTo(0); |
| 142 | const llvm::DataLayout &DL = M.getDataLayout(); |
| 143 | AllocaInt8PtrTy = Int8Ty->getPointerTo(DL.getAllocaAddrSpace()); |
| 144 | GlobalsInt8PtrTy = Int8Ty->getPointerTo(DL.getDefaultGlobalsAddressSpace()); |
| 145 | ConstGlobalsPtrTy = Int8Ty->getPointerTo( |
| 146 | C.getTargetAddressSpace(GetGlobalConstantAddressSpace())); |
| 147 | ASTAllocaAddressSpace = getTargetCodeGenInfo().getASTAllocaAddressSpace(); |
| 148 | |
| 149 | // Build C++20 Module initializers. |
| 150 | // TODO: Add Microsoft here once we know the mangling required for the |
| 151 | // initializers. |
| 152 | CXX20ModuleInits = |
| 153 | LangOpts.CPlusPlusModules && getCXXABI().getMangleContext().getKind() == |
| 154 | ItaniumMangleContext::MK_Itanium; |
| 155 | |
| 156 | RuntimeCC = getTargetCodeGenInfo().getABIInfo().getRuntimeCC(); |
| 157 | |
| 158 | if (LangOpts.ObjC) |
| 159 | createObjCRuntime(); |
| 160 | if (LangOpts.OpenCL) |
| 161 | createOpenCLRuntime(); |
| 162 | if (LangOpts.OpenMP) |
| 163 | createOpenMPRuntime(); |
| 164 | if (LangOpts.CUDA) |
| 165 | createCUDARuntime(); |
| 166 | if (LangOpts.HLSL) |
| 167 | createHLSLRuntime(); |
| 168 | |
| 169 | // Enable TBAA unless it's suppressed. ThreadSanitizer needs TBAA even at O0. |
| 170 | if (LangOpts.Sanitize.has(SanitizerKind::Thread) || |
| 171 | (!CodeGenOpts.RelaxedAliasing && CodeGenOpts.OptimizationLevel > 0)) |
| 172 | TBAA.reset(new CodeGenTBAA(Context, TheModule, CodeGenOpts, getLangOpts(), |
| 173 | getCXXABI().getMangleContext())); |
| 174 | |
| 175 | // If debug info or coverage generation is enabled, create the CGDebugInfo |
| 176 | // object. |
| 177 | if (CodeGenOpts.getDebugInfo() != codegenoptions::NoDebugInfo || |
| 178 | CodeGenOpts.EmitGcovArcs || CodeGenOpts.EmitGcovNotes) |
| 179 | DebugInfo.reset(new CGDebugInfo(*this)); |
| 180 | |
| 181 | Block.GlobalUniqueCount = 0; |
| 182 | |
| 183 | if (C.getLangOpts().ObjC) |
| 184 | ObjCData.reset(new ObjCEntrypoints()); |
| 185 | |
| 186 | if (CodeGenOpts.hasProfileClangUse()) { |
| 187 | auto ReaderOrErr = llvm::IndexedInstrProfReader::create( |
| 188 | CodeGenOpts.ProfileInstrumentUsePath, *FS, |
| 189 | CodeGenOpts.ProfileRemappingFile); |
| 190 | // We're checking for profile read errors in CompilerInvocation, so if |
| 191 | // there was an error it should've already been caught. If it hasn't been |
| 192 | // somehow, trip an assertion. |
| 193 | assert(ReaderOrErr)(static_cast <bool> (ReaderOrErr) ? void (0) : __assert_fail ("ReaderOrErr", "clang/lib/CodeGen/CodeGenModule.cpp", 193, __extension__ __PRETTY_FUNCTION__)); |
| 194 | PGOReader = std::move(ReaderOrErr.get()); |
| 195 | } |
| 196 | |
| 197 | // If coverage mapping generation is enabled, create the |
| 198 | // CoverageMappingModuleGen object. |
| 199 | if (CodeGenOpts.CoverageMapping) |
| 200 | CoverageMapping.reset(new CoverageMappingModuleGen(*this, *CoverageInfo)); |
| 201 | |
| 202 | // Generate the module name hash here if needed. |
| 203 | if (CodeGenOpts.UniqueInternalLinkageNames && |
| 204 | !getModule().getSourceFileName().empty()) { |
| 205 | std::string Path = getModule().getSourceFileName(); |
| 206 | // Check if a path substitution is needed from the MacroPrefixMap. |
| 207 | for (const auto &Entry : LangOpts.MacroPrefixMap) |
| 208 | if (Path.rfind(Entry.first, 0) != std::string::npos) { |
| 209 | Path = Entry.second + Path.substr(Entry.first.size()); |
| 210 | break; |
| 211 | } |
| 212 | ModuleNameHash = llvm::getUniqueInternalLinkagePostfix(Path); |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | CodeGenModule::~CodeGenModule() {} |
| 217 | |
| 218 | void CodeGenModule::createObjCRuntime() { |
| 219 | // This is just isGNUFamily(), but we want to force implementors of |
| 220 | // new ABIs to decide how best to do this. |
| 221 | switch (LangOpts.ObjCRuntime.getKind()) { |
| 222 | case ObjCRuntime::GNUstep: |
| 223 | case ObjCRuntime::GCC: |
| 224 | case ObjCRuntime::ObjFW: |
| 225 | ObjCRuntime.reset(CreateGNUObjCRuntime(*this)); |
| 226 | return; |
| 227 | |
| 228 | case ObjCRuntime::FragileMacOSX: |
| 229 | case ObjCRuntime::MacOSX: |
| 230 | case ObjCRuntime::iOS: |
| 231 | case ObjCRuntime::WatchOS: |
| 232 | ObjCRuntime.reset(CreateMacObjCRuntime(*this)); |
| 233 | return; |
| 234 | } |
| 235 | llvm_unreachable("bad runtime kind")::llvm::llvm_unreachable_internal("bad runtime kind", "clang/lib/CodeGen/CodeGenModule.cpp" , 235); |
| 236 | } |
| 237 | |
| 238 | void CodeGenModule::createOpenCLRuntime() { |
| 239 | OpenCLRuntime.reset(new CGOpenCLRuntime(*this)); |
| 240 | } |
| 241 | |
| 242 | void CodeGenModule::createOpenMPRuntime() { |
| 243 | // Select a specialized code generation class based on the target, if any. |
| 244 | // If it does not exist use the default implementation. |
| 245 | switch (getTriple().getArch()) { |
| 246 | case llvm::Triple::nvptx: |
| 247 | case llvm::Triple::nvptx64: |
| 248 | case llvm::Triple::amdgcn: |
| 249 | assert(getLangOpts().OpenMPIsDevice &&(static_cast <bool> (getLangOpts().OpenMPIsDevice && "OpenMP AMDGPU/NVPTX is only prepared to deal with device code." ) ? void (0) : __assert_fail ("getLangOpts().OpenMPIsDevice && \"OpenMP AMDGPU/NVPTX is only prepared to deal with device code.\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 250, __extension__ __PRETTY_FUNCTION__ )) |
| 250 | "OpenMP AMDGPU/NVPTX is only prepared to deal with device code.")(static_cast <bool> (getLangOpts().OpenMPIsDevice && "OpenMP AMDGPU/NVPTX is only prepared to deal with device code." ) ? void (0) : __assert_fail ("getLangOpts().OpenMPIsDevice && \"OpenMP AMDGPU/NVPTX is only prepared to deal with device code.\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 250, __extension__ __PRETTY_FUNCTION__ )); |
| 251 | OpenMPRuntime.reset(new CGOpenMPRuntimeGPU(*this)); |
| 252 | break; |
| 253 | default: |
| 254 | if (LangOpts.OpenMPSimd) |
| 255 | OpenMPRuntime.reset(new CGOpenMPSIMDRuntime(*this)); |
| 256 | else |
| 257 | OpenMPRuntime.reset(new CGOpenMPRuntime(*this)); |
| 258 | break; |
| 259 | } |
| 260 | } |
| 261 | |
| 262 | void CodeGenModule::createCUDARuntime() { |
| 263 | CUDARuntime.reset(CreateNVCUDARuntime(*this)); |
| 264 | } |
| 265 | |
| 266 | void CodeGenModule::createHLSLRuntime() { |
| 267 | HLSLRuntime.reset(new CGHLSLRuntime(*this)); |
| 268 | } |
| 269 | |
| 270 | void CodeGenModule::addReplacement(StringRef Name, llvm::Constant *C) { |
| 271 | Replacements[Name] = C; |
| 272 | } |
| 273 | |
| 274 | void CodeGenModule::applyReplacements() { |
| 275 | for (auto &I : Replacements) { |
| 276 | StringRef MangledName = I.first(); |
| 277 | llvm::Constant *Replacement = I.second; |
| 278 | llvm::GlobalValue *Entry = GetGlobalValue(MangledName); |
| 279 | if (!Entry) |
| 280 | continue; |
| 281 | auto *OldF = cast<llvm::Function>(Entry); |
| 282 | auto *NewF = dyn_cast<llvm::Function>(Replacement); |
| 283 | if (!NewF) { |
| 284 | if (auto *Alias = dyn_cast<llvm::GlobalAlias>(Replacement)) { |
| 285 | NewF = dyn_cast<llvm::Function>(Alias->getAliasee()); |
| 286 | } else { |
| 287 | auto *CE = cast<llvm::ConstantExpr>(Replacement); |
| 288 | 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" , "clang/lib/CodeGen/CodeGenModule.cpp", 289, __extension__ __PRETTY_FUNCTION__ )) |
| 289 | 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" , "clang/lib/CodeGen/CodeGenModule.cpp", 289, __extension__ __PRETTY_FUNCTION__ )); |
| 290 | NewF = dyn_cast<llvm::Function>(CE->getOperand(0)); |
| 291 | } |
| 292 | } |
| 293 | |
| 294 | // Replace old with new, but keep the old order. |
| 295 | OldF->replaceAllUsesWith(Replacement); |
| 296 | if (NewF) { |
| 297 | NewF->removeFromParent(); |
| 298 | OldF->getParent()->getFunctionList().insertAfter(OldF->getIterator(), |
| 299 | NewF); |
| 300 | } |
| 301 | OldF->eraseFromParent(); |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | void CodeGenModule::addGlobalValReplacement(llvm::GlobalValue *GV, llvm::Constant *C) { |
| 306 | GlobalValReplacements.push_back(std::make_pair(GV, C)); |
| 307 | } |
| 308 | |
| 309 | void CodeGenModule::applyGlobalValReplacements() { |
| 310 | for (auto &I : GlobalValReplacements) { |
| 311 | llvm::GlobalValue *GV = I.first; |
| 312 | llvm::Constant *C = I.second; |
| 313 | |
| 314 | GV->replaceAllUsesWith(C); |
| 315 | GV->eraseFromParent(); |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | // This is only used in aliases that we created and we know they have a |
| 320 | // linear structure. |
| 321 | static const llvm::GlobalValue *getAliasedGlobal(const llvm::GlobalValue *GV) { |
| 322 | const llvm::Constant *C; |
| 323 | if (auto *GA = dyn_cast<llvm::GlobalAlias>(GV)) |
| 324 | C = GA->getAliasee(); |
| 325 | else if (auto *GI = dyn_cast<llvm::GlobalIFunc>(GV)) |
| 326 | C = GI->getResolver(); |
| 327 | else |
| 328 | return GV; |
| 329 | |
| 330 | const auto *AliaseeGV = dyn_cast<llvm::GlobalValue>(C->stripPointerCasts()); |
| 331 | if (!AliaseeGV) |
| 332 | return nullptr; |
| 333 | |
| 334 | const llvm::GlobalValue *FinalGV = AliaseeGV->getAliaseeObject(); |
| 335 | if (FinalGV == GV) |
| 336 | return nullptr; |
| 337 | |
| 338 | return FinalGV; |
| 339 | } |
| 340 | |
| 341 | static bool checkAliasedGlobal(DiagnosticsEngine &Diags, |
| 342 | SourceLocation Location, bool IsIFunc, |
| 343 | const llvm::GlobalValue *Alias, |
| 344 | const llvm::GlobalValue *&GV) { |
| 345 | GV = getAliasedGlobal(Alias); |
| 346 | if (!GV) { |
| 347 | Diags.Report(Location, diag::err_cyclic_alias) << IsIFunc; |
| 348 | return false; |
| 349 | } |
| 350 | |
| 351 | if (GV->isDeclaration()) { |
| 352 | Diags.Report(Location, diag::err_alias_to_undefined) << IsIFunc << IsIFunc; |
| 353 | return false; |
| 354 | } |
| 355 | |
| 356 | if (IsIFunc) { |
| 357 | // Check resolver function type. |
| 358 | const auto *F = dyn_cast<llvm::Function>(GV); |
| 359 | if (!F) { |
| 360 | Diags.Report(Location, diag::err_alias_to_undefined) |
| 361 | << IsIFunc << IsIFunc; |
| 362 | return false; |
| 363 | } |
| 364 | |
| 365 | llvm::FunctionType *FTy = F->getFunctionType(); |
| 366 | if (!FTy->getReturnType()->isPointerTy()) { |
| 367 | Diags.Report(Location, diag::err_ifunc_resolver_return); |
| 368 | return false; |
| 369 | } |
| 370 | } |
| 371 | |
| 372 | return true; |
| 373 | } |
| 374 | |
| 375 | void CodeGenModule::checkAliases() { |
| 376 | // Check if the constructed aliases are well formed. It is really unfortunate |
| 377 | // that we have to do this in CodeGen, but we only construct mangled names |
| 378 | // and aliases during codegen. |
| 379 | bool Error = false; |
| 380 | DiagnosticsEngine &Diags = getDiags(); |
| 381 | for (const GlobalDecl &GD : Aliases) { |
| 382 | const auto *D = cast<ValueDecl>(GD.getDecl()); |
| 383 | SourceLocation Location; |
| 384 | bool IsIFunc = D->hasAttr<IFuncAttr>(); |
| 385 | if (const Attr *A = D->getDefiningAttr()) |
| 386 | Location = A->getLocation(); |
| 387 | else |
| 388 | llvm_unreachable("Not an alias or ifunc?")::llvm::llvm_unreachable_internal("Not an alias or ifunc?", "clang/lib/CodeGen/CodeGenModule.cpp" , 388); |
| 389 | |
| 390 | StringRef MangledName = getMangledName(GD); |
| 391 | llvm::GlobalValue *Alias = GetGlobalValue(MangledName); |
| 392 | const llvm::GlobalValue *GV = nullptr; |
| 393 | if (!checkAliasedGlobal(Diags, Location, IsIFunc, Alias, GV)) { |
| 394 | Error = true; |
| 395 | continue; |
| 396 | } |
| 397 | |
| 398 | llvm::Constant *Aliasee = |
| 399 | IsIFunc ? cast<llvm::GlobalIFunc>(Alias)->getResolver() |
| 400 | : cast<llvm::GlobalAlias>(Alias)->getAliasee(); |
| 401 | |
| 402 | llvm::GlobalValue *AliaseeGV; |
| 403 | if (auto CE = dyn_cast<llvm::ConstantExpr>(Aliasee)) |
| 404 | AliaseeGV = cast<llvm::GlobalValue>(CE->getOperand(0)); |
| 405 | else |
| 406 | AliaseeGV = cast<llvm::GlobalValue>(Aliasee); |
| 407 | |
| 408 | if (const SectionAttr *SA = D->getAttr<SectionAttr>()) { |
| 409 | StringRef AliasSection = SA->getName(); |
| 410 | if (AliasSection != AliaseeGV->getSection()) |
| 411 | Diags.Report(SA->getLocation(), diag::warn_alias_with_section) |
| 412 | << AliasSection << IsIFunc << IsIFunc; |
| 413 | } |
| 414 | |
| 415 | // We have to handle alias to weak aliases in here. LLVM itself disallows |
| 416 | // this since the object semantics would not match the IL one. For |
| 417 | // compatibility with gcc we implement it by just pointing the alias |
| 418 | // to its aliasee's aliasee. We also warn, since the user is probably |
| 419 | // expecting the link to be weak. |
| 420 | if (auto *GA = dyn_cast<llvm::GlobalAlias>(AliaseeGV)) { |
| 421 | if (GA->isInterposable()) { |
| 422 | Diags.Report(Location, diag::warn_alias_to_weak_alias) |
| 423 | << GV->getName() << GA->getName() << IsIFunc; |
| 424 | Aliasee = llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast( |
| 425 | GA->getAliasee(), Alias->getType()); |
| 426 | |
| 427 | if (IsIFunc) |
| 428 | cast<llvm::GlobalIFunc>(Alias)->setResolver(Aliasee); |
| 429 | else |
| 430 | cast<llvm::GlobalAlias>(Alias)->setAliasee(Aliasee); |
| 431 | } |
| 432 | } |
| 433 | } |
| 434 | if (!Error) |
| 435 | return; |
| 436 | |
| 437 | for (const GlobalDecl &GD : Aliases) { |
| 438 | StringRef MangledName = getMangledName(GD); |
| 439 | llvm::GlobalValue *Alias = GetGlobalValue(MangledName); |
| 440 | Alias->replaceAllUsesWith(llvm::UndefValue::get(Alias->getType())); |
| 441 | Alias->eraseFromParent(); |
| 442 | } |
| 443 | } |
| 444 | |
| 445 | void CodeGenModule::clear() { |
| 446 | DeferredDeclsToEmit.clear(); |
| 447 | EmittedDeferredDecls.clear(); |
| 448 | if (OpenMPRuntime) |
| 449 | OpenMPRuntime->clear(); |
| 450 | } |
| 451 | |
| 452 | void InstrProfStats::reportDiagnostics(DiagnosticsEngine &Diags, |
| 453 | StringRef MainFile) { |
| 454 | if (!hasDiagnostics()) |
| 455 | return; |
| 456 | if (VisitedInMainFile > 0 && VisitedInMainFile == MissingInMainFile) { |
| 457 | if (MainFile.empty()) |
| 458 | MainFile = "<stdin>"; |
| 459 | Diags.Report(diag::warn_profile_data_unprofiled) << MainFile; |
| 460 | } else { |
| 461 | if (Mismatched > 0) |
| 462 | Diags.Report(diag::warn_profile_data_out_of_date) << Visited << Mismatched; |
| 463 | |
| 464 | if (Missing > 0) |
| 465 | Diags.Report(diag::warn_profile_data_missing) << Visited << Missing; |
| 466 | } |
| 467 | } |
| 468 | |
| 469 | static void setVisibilityFromDLLStorageClass(const clang::LangOptions &LO, |
| 470 | llvm::Module &M) { |
| 471 | if (!LO.VisibilityFromDLLStorageClass) |
| 472 | return; |
| 473 | |
| 474 | llvm::GlobalValue::VisibilityTypes DLLExportVisibility = |
| 475 | CodeGenModule::GetLLVMVisibility(LO.getDLLExportVisibility()); |
| 476 | llvm::GlobalValue::VisibilityTypes NoDLLStorageClassVisibility = |
| 477 | CodeGenModule::GetLLVMVisibility(LO.getNoDLLStorageClassVisibility()); |
| 478 | llvm::GlobalValue::VisibilityTypes ExternDeclDLLImportVisibility = |
| 479 | CodeGenModule::GetLLVMVisibility(LO.getExternDeclDLLImportVisibility()); |
| 480 | llvm::GlobalValue::VisibilityTypes ExternDeclNoDLLStorageClassVisibility = |
| 481 | CodeGenModule::GetLLVMVisibility( |
| 482 | LO.getExternDeclNoDLLStorageClassVisibility()); |
| 483 | |
| 484 | for (llvm::GlobalValue &GV : M.global_values()) { |
| 485 | if (GV.hasAppendingLinkage() || GV.hasLocalLinkage()) |
| 486 | continue; |
| 487 | |
| 488 | // Reset DSO locality before setting the visibility. This removes |
| 489 | // any effects that visibility options and annotations may have |
| 490 | // had on the DSO locality. Setting the visibility will implicitly set |
| 491 | // appropriate globals to DSO Local; however, this will be pessimistic |
| 492 | // w.r.t. to the normal compiler IRGen. |
| 493 | GV.setDSOLocal(false); |
| 494 | |
| 495 | if (GV.isDeclarationForLinker()) { |
| 496 | GV.setVisibility(GV.getDLLStorageClass() == |
| 497 | llvm::GlobalValue::DLLImportStorageClass |
| 498 | ? ExternDeclDLLImportVisibility |
| 499 | : ExternDeclNoDLLStorageClassVisibility); |
| 500 | } else { |
| 501 | GV.setVisibility(GV.getDLLStorageClass() == |
| 502 | llvm::GlobalValue::DLLExportStorageClass |
| 503 | ? DLLExportVisibility |
| 504 | : NoDLLStorageClassVisibility); |
| 505 | } |
| 506 | |
| 507 | GV.setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass); |
| 508 | } |
| 509 | } |
| 510 | |
| 511 | void CodeGenModule::Release() { |
| 512 | Module *Primary = getContext().getModuleForCodeGen(); |
| 513 | if (CXX20ModuleInits && Primary && !Primary->isHeaderLikeModule()) |
| 514 | EmitModuleInitializers(Primary); |
| 515 | EmitDeferred(); |
| 516 | DeferredDecls.insert(EmittedDeferredDecls.begin(), |
| 517 | EmittedDeferredDecls.end()); |
| 518 | EmittedDeferredDecls.clear(); |
| 519 | EmitVTablesOpportunistically(); |
| 520 | applyGlobalValReplacements(); |
| 521 | applyReplacements(); |
| 522 | emitMultiVersionFunctions(); |
| 523 | |
| 524 | if (Context.getLangOpts().IncrementalExtensions && |
| 525 | GlobalTopLevelStmtBlockInFlight.first) { |
| 526 | const TopLevelStmtDecl *TLSD = GlobalTopLevelStmtBlockInFlight.second; |
| 527 | GlobalTopLevelStmtBlockInFlight.first->FinishFunction(TLSD->getEndLoc()); |
| 528 | GlobalTopLevelStmtBlockInFlight = {nullptr, nullptr}; |
| 529 | } |
| 530 | |
| 531 | if (CXX20ModuleInits && Primary && Primary->isInterfaceOrPartition()) |
| 532 | EmitCXXModuleInitFunc(Primary); |
| 533 | else |
| 534 | EmitCXXGlobalInitFunc(); |
| 535 | EmitCXXGlobalCleanUpFunc(); |
| 536 | registerGlobalDtorsWithAtExit(); |
| 537 | EmitCXXThreadLocalInitFunc(); |
| 538 | if (ObjCRuntime) |
| 539 | if (llvm::Function *ObjCInitFunction = ObjCRuntime->ModuleInitFunction()) |
| 540 | AddGlobalCtor(ObjCInitFunction); |
| 541 | if (Context.getLangOpts().CUDA && CUDARuntime) { |
| 542 | if (llvm::Function *CudaCtorFunction = CUDARuntime->finalizeModule()) |
| 543 | AddGlobalCtor(CudaCtorFunction); |
| 544 | } |
| 545 | if (OpenMPRuntime) { |
| 546 | if (llvm::Function *OpenMPRequiresDirectiveRegFun = |
| 547 | OpenMPRuntime->emitRequiresDirectiveRegFun()) { |
| 548 | AddGlobalCtor(OpenMPRequiresDirectiveRegFun, 0); |
| 549 | } |
| 550 | OpenMPRuntime->createOffloadEntriesAndInfoMetadata(); |
| 551 | OpenMPRuntime->clear(); |
| 552 | } |
| 553 | if (PGOReader) { |
| 554 | getModule().setProfileSummary( |
| 555 | PGOReader->getSummary(/* UseCS */ false).getMD(VMContext), |
| 556 | llvm::ProfileSummary::PSK_Instr); |
| 557 | if (PGOStats.hasDiagnostics()) |
| 558 | PGOStats.reportDiagnostics(getDiags(), getCodeGenOpts().MainFileName); |
| 559 | } |
| 560 | llvm::stable_sort(GlobalCtors, [](const Structor &L, const Structor &R) { |
| 561 | return L.LexOrder < R.LexOrder; |
| 562 | }); |
| 563 | EmitCtorList(GlobalCtors, "llvm.global_ctors"); |
| 564 | EmitCtorList(GlobalDtors, "llvm.global_dtors"); |
| 565 | EmitGlobalAnnotations(); |
| 566 | EmitStaticExternCAliases(); |
| 567 | checkAliases(); |
| 568 | EmitDeferredUnusedCoverageMappings(); |
| 569 | CodeGenPGO(*this).setValueProfilingFlag(getModule()); |
| 570 | if (CoverageMapping) |
| 571 | CoverageMapping->emit(); |
| 572 | if (CodeGenOpts.SanitizeCfiCrossDso) { |
| 573 | CodeGenFunction(*this).EmitCfiCheckFail(); |
| 574 | CodeGenFunction(*this).EmitCfiCheckStub(); |
| 575 | } |
| 576 | if (LangOpts.Sanitize.has(SanitizerKind::KCFI)) |
| 577 | finalizeKCFITypes(); |
| 578 | emitAtAvailableLinkGuard(); |
| 579 | if (Context.getTargetInfo().getTriple().isWasm()) |
| 580 | EmitMainVoidAlias(); |
| 581 | |
| 582 | if (getTriple().isAMDGPU()) { |
| 583 | // Emit reference of __amdgpu_device_library_preserve_asan_functions to |
| 584 | // preserve ASAN functions in bitcode libraries. |
| 585 | if (LangOpts.Sanitize.has(SanitizerKind::Address)) { |
| 586 | auto *FT = llvm::FunctionType::get(VoidTy, {}); |
| 587 | auto *F = llvm::Function::Create( |
| 588 | FT, llvm::GlobalValue::ExternalLinkage, |
| 589 | "__amdgpu_device_library_preserve_asan_functions", &getModule()); |
| 590 | auto *Var = new llvm::GlobalVariable( |
| 591 | getModule(), FT->getPointerTo(), |
| 592 | /*isConstant=*/true, llvm::GlobalValue::WeakAnyLinkage, F, |
| 593 | "__amdgpu_device_library_preserve_asan_functions_ptr", nullptr, |
| 594 | llvm::GlobalVariable::NotThreadLocal); |
| 595 | addCompilerUsedGlobal(Var); |
| 596 | } |
| 597 | // Emit amdgpu_code_object_version module flag, which is code object version |
| 598 | // times 100. |
| 599 | if (getTarget().getTargetOpts().CodeObjectVersion != |
| 600 | TargetOptions::COV_None) { |
| 601 | getModule().addModuleFlag(llvm::Module::Error, |
| 602 | "amdgpu_code_object_version", |
| 603 | getTarget().getTargetOpts().CodeObjectVersion); |
| 604 | } |
| 605 | } |
| 606 | |
| 607 | // Emit a global array containing all external kernels or device variables |
| 608 | // used by host functions and mark it as used for CUDA/HIP. This is necessary |
| 609 | // to get kernels or device variables in archives linked in even if these |
| 610 | // kernels or device variables are only used in host functions. |
| 611 | if (!Context.CUDAExternalDeviceDeclODRUsedByHost.empty()) { |
| 612 | SmallVector<llvm::Constant *, 8> UsedArray; |
| 613 | for (auto D : Context.CUDAExternalDeviceDeclODRUsedByHost) { |
| 614 | GlobalDecl GD; |
| 615 | if (auto *FD = dyn_cast<FunctionDecl>(D)) |
| 616 | GD = GlobalDecl(FD, KernelReferenceKind::Kernel); |
| 617 | else |
| 618 | GD = GlobalDecl(D); |
| 619 | UsedArray.push_back(llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast( |
| 620 | GetAddrOfGlobal(GD), Int8PtrTy)); |
| 621 | } |
| 622 | |
| 623 | llvm::ArrayType *ATy = llvm::ArrayType::get(Int8PtrTy, UsedArray.size()); |
| 624 | |
| 625 | auto *GV = new llvm::GlobalVariable( |
| 626 | getModule(), ATy, false, llvm::GlobalValue::InternalLinkage, |
| 627 | llvm::ConstantArray::get(ATy, UsedArray), "__clang_gpu_used_external"); |
| 628 | addCompilerUsedGlobal(GV); |
| 629 | } |
| 630 | |
| 631 | emitLLVMUsed(); |
| 632 | if (SanStats) |
| 633 | SanStats->finish(); |
| 634 | |
| 635 | if (CodeGenOpts.Autolink && |
| 636 | (Context.getLangOpts().Modules || !LinkerOptionsMetadata.empty())) { |
| 637 | EmitModuleLinkOptions(); |
| 638 | } |
| 639 | |
| 640 | // On ELF we pass the dependent library specifiers directly to the linker |
| 641 | // without manipulating them. This is in contrast to other platforms where |
| 642 | // they are mapped to a specific linker option by the compiler. This |
| 643 | // difference is a result of the greater variety of ELF linkers and the fact |
| 644 | // that ELF linkers tend to handle libraries in a more complicated fashion |
| 645 | // than on other platforms. This forces us to defer handling the dependent |
| 646 | // libs to the linker. |
| 647 | // |
| 648 | // CUDA/HIP device and host libraries are different. Currently there is no |
| 649 | // way to differentiate dependent libraries for host or device. Existing |
| 650 | // usage of #pragma comment(lib, *) is intended for host libraries on |
| 651 | // Windows. Therefore emit llvm.dependent-libraries only for host. |
| 652 | if (!ELFDependentLibraries.empty() && !Context.getLangOpts().CUDAIsDevice) { |
| 653 | auto *NMD = getModule().getOrInsertNamedMetadata("llvm.dependent-libraries"); |
| 654 | for (auto *MD : ELFDependentLibraries) |
| 655 | NMD->addOperand(MD); |
| 656 | } |
| 657 | |
| 658 | // Record mregparm value now so it is visible through rest of codegen. |
| 659 | if (Context.getTargetInfo().getTriple().getArch() == llvm::Triple::x86) |
| 660 | getModule().addModuleFlag(llvm::Module::Error, "NumRegisterParameters", |
| 661 | CodeGenOpts.NumRegisterParameters); |
| 662 | |
| 663 | if (CodeGenOpts.DwarfVersion) { |
| 664 | getModule().addModuleFlag(llvm::Module::Max, "Dwarf Version", |
| 665 | CodeGenOpts.DwarfVersion); |
| 666 | } |
| 667 | |
| 668 | if (CodeGenOpts.Dwarf64) |
| 669 | getModule().addModuleFlag(llvm::Module::Max, "DWARF64", 1); |
| 670 | |
| 671 | if (Context.getLangOpts().SemanticInterposition) |
| 672 | // Require various optimization to respect semantic interposition. |
| 673 | getModule().setSemanticInterposition(true); |
| 674 | |
| 675 | if (CodeGenOpts.EmitCodeView) { |
| 676 | // Indicate that we want CodeView in the metadata. |
| 677 | getModule().addModuleFlag(llvm::Module::Warning, "CodeView", 1); |
| 678 | } |
| 679 | if (CodeGenOpts.CodeViewGHash) { |
| 680 | getModule().addModuleFlag(llvm::Module::Warning, "CodeViewGHash", 1); |
| 681 | } |
| 682 | if (CodeGenOpts.ControlFlowGuard) { |
| 683 | // Function ID tables and checks for Control Flow Guard (cfguard=2). |
| 684 | getModule().addModuleFlag(llvm::Module::Warning, "cfguard", 2); |
| 685 | } else if (CodeGenOpts.ControlFlowGuardNoChecks) { |
| 686 | // Function ID tables for Control Flow Guard (cfguard=1). |
| 687 | getModule().addModuleFlag(llvm::Module::Warning, "cfguard", 1); |
| 688 | } |
| 689 | if (CodeGenOpts.EHContGuard) { |
| 690 | // Function ID tables for EH Continuation Guard. |
| 691 | getModule().addModuleFlag(llvm::Module::Warning, "ehcontguard", 1); |
| 692 | } |
| 693 | if (Context.getLangOpts().Kernel) { |
| 694 | // Note if we are compiling with /kernel. |
| 695 | getModule().addModuleFlag(llvm::Module::Warning, "ms-kernel", 1); |
| 696 | } |
| 697 | if (CodeGenOpts.OptimizationLevel > 0 && CodeGenOpts.StrictVTablePointers) { |
| 698 | // We don't support LTO with 2 with different StrictVTablePointers |
| 699 | // FIXME: we could support it by stripping all the information introduced |
| 700 | // by StrictVTablePointers. |
| 701 | |
| 702 | getModule().addModuleFlag(llvm::Module::Error, "StrictVTablePointers",1); |
| 703 | |
| 704 | llvm::Metadata *Ops[2] = { |
| 705 | llvm::MDString::get(VMContext, "StrictVTablePointers"), |
| 706 | llvm::ConstantAsMetadata::get(llvm::ConstantInt::get( |
| 707 | llvm::Type::getInt32Ty(VMContext), 1))}; |
| 708 | |
| 709 | getModule().addModuleFlag(llvm::Module::Require, |
| 710 | "StrictVTablePointersRequirement", |
| 711 | llvm::MDNode::get(VMContext, Ops)); |
| 712 | } |
| 713 | if (getModuleDebugInfo()) |
| 714 | // We support a single version in the linked module. The LLVM |
| 715 | // parser will drop debug info with a different version number |
| 716 | // (and warn about it, too). |
| 717 | getModule().addModuleFlag(llvm::Module::Warning, "Debug Info Version", |
| 718 | llvm::DEBUG_METADATA_VERSION); |
| 719 | |
| 720 | // We need to record the widths of enums and wchar_t, so that we can generate |
| 721 | // the correct build attributes in the ARM backend. wchar_size is also used by |
| 722 | // TargetLibraryInfo. |
| 723 | uint64_t WCharWidth = |
| 724 | Context.getTypeSizeInChars(Context.getWideCharType()).getQuantity(); |
| 725 | getModule().addModuleFlag(llvm::Module::Error, "wchar_size", WCharWidth); |
| 726 | |
| 727 | llvm::Triple::ArchType Arch = Context.getTargetInfo().getTriple().getArch(); |
| 728 | if ( Arch == llvm::Triple::arm |
| 729 | || Arch == llvm::Triple::armeb |
| 730 | || Arch == llvm::Triple::thumb |
| 731 | || Arch == llvm::Triple::thumbeb) { |
| 732 | // The minimum width of an enum in bytes |
| 733 | uint64_t EnumWidth = Context.getLangOpts().ShortEnums ? 1 : 4; |
| 734 | getModule().addModuleFlag(llvm::Module::Error, "min_enum_size", EnumWidth); |
| 735 | } |
| 736 | |
| 737 | if (Arch == llvm::Triple::riscv32 || Arch == llvm::Triple::riscv64) { |
| 738 | StringRef ABIStr = Target.getABI(); |
| 739 | llvm::LLVMContext &Ctx = TheModule.getContext(); |
| 740 | getModule().addModuleFlag(llvm::Module::Error, "target-abi", |
| 741 | llvm::MDString::get(Ctx, ABIStr)); |
| 742 | } |
| 743 | |
| 744 | if (CodeGenOpts.SanitizeCfiCrossDso) { |
| 745 | // Indicate that we want cross-DSO control flow integrity checks. |
| 746 | getModule().addModuleFlag(llvm::Module::Override, "Cross-DSO CFI", 1); |
| 747 | } |
| 748 | |
| 749 | if (CodeGenOpts.WholeProgramVTables) { |
| 750 | // Indicate whether VFE was enabled for this module, so that the |
| 751 | // vcall_visibility metadata added under whole program vtables is handled |
| 752 | // appropriately in the optimizer. |
| 753 | getModule().addModuleFlag(llvm::Module::Error, "Virtual Function Elim", |
| 754 | CodeGenOpts.VirtualFunctionElimination); |
| 755 | } |
| 756 | |
| 757 | if (LangOpts.Sanitize.has(SanitizerKind::CFIICall)) { |
| 758 | getModule().addModuleFlag(llvm::Module::Override, |
| 759 | "CFI Canonical Jump Tables", |
| 760 | CodeGenOpts.SanitizeCfiCanonicalJumpTables); |
| 761 | } |
| 762 | |
| 763 | if (LangOpts.Sanitize.has(SanitizerKind::KCFI)) { |
| 764 | getModule().addModuleFlag(llvm::Module::Override, "kcfi", 1); |
| 765 | // KCFI assumes patchable-function-prefix is the same for all indirectly |
| 766 | // called functions. Store the expected offset for code generation. |
| 767 | if (CodeGenOpts.PatchableFunctionEntryOffset) |
| 768 | getModule().addModuleFlag(llvm::Module::Override, "kcfi-offset", |
| 769 | CodeGenOpts.PatchableFunctionEntryOffset); |
| 770 | } |
| 771 | |
| 772 | if (CodeGenOpts.CFProtectionReturn && |
| 773 | Target.checkCFProtectionReturnSupported(getDiags())) { |
| 774 | // Indicate that we want to instrument return control flow protection. |
| 775 | getModule().addModuleFlag(llvm::Module::Min, "cf-protection-return", |
| 776 | 1); |
| 777 | } |
| 778 | |
| 779 | if (CodeGenOpts.CFProtectionBranch && |
| 780 | Target.checkCFProtectionBranchSupported(getDiags())) { |
| 781 | // Indicate that we want to instrument branch control flow protection. |
| 782 | getModule().addModuleFlag(llvm::Module::Min, "cf-protection-branch", |
| 783 | 1); |
| 784 | } |
| 785 | |
| 786 | if (CodeGenOpts.FunctionReturnThunks) |
| 787 | getModule().addModuleFlag(llvm::Module::Override, "function_return_thunk_extern", 1); |
| 788 | |
| 789 | if (CodeGenOpts.IndirectBranchCSPrefix) |
| 790 | getModule().addModuleFlag(llvm::Module::Override, "indirect_branch_cs_prefix", 1); |
| 791 | |
| 792 | // Add module metadata for return address signing (ignoring |
| 793 | // non-leaf/all) and stack tagging. These are actually turned on by function |
| 794 | // attributes, but we use module metadata to emit build attributes. This is |
| 795 | // needed for LTO, where the function attributes are inside bitcode |
| 796 | // serialised into a global variable by the time build attributes are |
| 797 | // emitted, so we can't access them. LTO objects could be compiled with |
| 798 | // different flags therefore module flags are set to "Min" behavior to achieve |
| 799 | // the same end result of the normal build where e.g BTI is off if any object |
| 800 | // doesn't support it. |
| 801 | if (Context.getTargetInfo().hasFeature("ptrauth") && |
| 802 | LangOpts.getSignReturnAddressScope() != |
| 803 | LangOptions::SignReturnAddressScopeKind::None) |
| 804 | getModule().addModuleFlag(llvm::Module::Override, |
| 805 | "sign-return-address-buildattr", 1); |
| 806 | if (LangOpts.Sanitize.has(SanitizerKind::MemtagStack)) |
| 807 | getModule().addModuleFlag(llvm::Module::Override, |
| 808 | "tag-stack-memory-buildattr", 1); |
| 809 | |
| 810 | if (Arch == llvm::Triple::thumb || Arch == llvm::Triple::thumbeb || |
| 811 | Arch == llvm::Triple::arm || Arch == llvm::Triple::armeb || |
| 812 | Arch == llvm::Triple::aarch64 || Arch == llvm::Triple::aarch64_32 || |
| 813 | Arch == llvm::Triple::aarch64_be) { |
| 814 | if (LangOpts.BranchTargetEnforcement) |
| 815 | getModule().addModuleFlag(llvm::Module::Min, "branch-target-enforcement", |
| 816 | 1); |
| 817 | if (LangOpts.hasSignReturnAddress()) |
| 818 | getModule().addModuleFlag(llvm::Module::Min, "sign-return-address", 1); |
| 819 | if (LangOpts.isSignReturnAddressScopeAll()) |
| 820 | getModule().addModuleFlag(llvm::Module::Min, "sign-return-address-all", |
| 821 | 1); |
| 822 | if (!LangOpts.isSignReturnAddressWithAKey()) |
| 823 | getModule().addModuleFlag(llvm::Module::Min, |
| 824 | "sign-return-address-with-bkey", 1); |
| 825 | } |
| 826 | |
| 827 | if (!CodeGenOpts.MemoryProfileOutput.empty()) { |
| 828 | llvm::LLVMContext &Ctx = TheModule.getContext(); |
| 829 | getModule().addModuleFlag( |
| 830 | llvm::Module::Error, "MemProfProfileFilename", |
| 831 | llvm::MDString::get(Ctx, CodeGenOpts.MemoryProfileOutput)); |
| 832 | } |
| 833 | |
| 834 | if (LangOpts.CUDAIsDevice && getTriple().isNVPTX()) { |
| 835 | // Indicate whether __nvvm_reflect should be configured to flush denormal |
| 836 | // floating point values to 0. (This corresponds to its "__CUDA_FTZ" |
| 837 | // property.) |
| 838 | getModule().addModuleFlag(llvm::Module::Override, "nvvm-reflect-ftz", |
| 839 | CodeGenOpts.FP32DenormalMode.Output != |
| 840 | llvm::DenormalMode::IEEE); |
| 841 | } |
| 842 | |
| 843 | if (LangOpts.EHAsynch) |
| 844 | getModule().addModuleFlag(llvm::Module::Warning, "eh-asynch", 1); |
| 845 | |
| 846 | // Indicate whether this Module was compiled with -fopenmp |
| 847 | if (getLangOpts().OpenMP && !getLangOpts().OpenMPSimd) |
| 848 | getModule().addModuleFlag(llvm::Module::Max, "openmp", LangOpts.OpenMP); |
| 849 | if (getLangOpts().OpenMPIsDevice) |
| 850 | getModule().addModuleFlag(llvm::Module::Max, "openmp-device", |
| 851 | LangOpts.OpenMP); |
| 852 | |
| 853 | // Emit OpenCL specific module metadata: OpenCL/SPIR version. |
| 854 | if (LangOpts.OpenCL || (LangOpts.CUDAIsDevice && getTriple().isSPIRV())) { |
| 855 | EmitOpenCLMetadata(); |
| 856 | // Emit SPIR version. |
| 857 | if (getTriple().isSPIR()) { |
| 858 | // SPIR v2.0 s2.12 - The SPIR version used by the module is stored in the |
| 859 | // opencl.spir.version named metadata. |
| 860 | // C++ for OpenCL has a distinct mapping for version compatibility with |
| 861 | // OpenCL. |
| 862 | auto Version = LangOpts.getOpenCLCompatibleVersion(); |
| 863 | llvm::Metadata *SPIRVerElts[] = { |
| 864 | llvm::ConstantAsMetadata::get(llvm::ConstantInt::get( |
| 865 | Int32Ty, Version / 100)), |
| 866 | llvm::ConstantAsMetadata::get(llvm::ConstantInt::get( |
| 867 | Int32Ty, (Version / 100 > 1) ? 0 : 2))}; |
| 868 | llvm::NamedMDNode *SPIRVerMD = |
| 869 | TheModule.getOrInsertNamedMetadata("opencl.spir.version"); |
| 870 | llvm::LLVMContext &Ctx = TheModule.getContext(); |
| 871 | SPIRVerMD->addOperand(llvm::MDNode::get(Ctx, SPIRVerElts)); |
| 872 | } |
| 873 | } |
| 874 | |
| 875 | // HLSL related end of code gen work items. |
| 876 | if (LangOpts.HLSL) |
| 877 | getHLSLRuntime().finishCodeGen(); |
| 878 | |
| 879 | if (uint32_t PLevel = Context.getLangOpts().PICLevel) { |
| 880 | assert(PLevel < 3 && "Invalid PIC Level")(static_cast <bool> (PLevel < 3 && "Invalid PIC Level" ) ? void (0) : __assert_fail ("PLevel < 3 && \"Invalid PIC Level\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 880, __extension__ __PRETTY_FUNCTION__ )); |
| 881 | getModule().setPICLevel(static_cast<llvm::PICLevel::Level>(PLevel)); |
| 882 | if (Context.getLangOpts().PIE) |
| 883 | getModule().setPIELevel(static_cast<llvm::PIELevel::Level>(PLevel)); |
| 884 | } |
| 885 | |
| 886 | if (getCodeGenOpts().CodeModel.size() > 0) { |
| 887 | unsigned CM = llvm::StringSwitch<unsigned>(getCodeGenOpts().CodeModel) |
| 888 | .Case("tiny", llvm::CodeModel::Tiny) |
| 889 | .Case("small", llvm::CodeModel::Small) |
| 890 | .Case("kernel", llvm::CodeModel::Kernel) |
| 891 | .Case("medium", llvm::CodeModel::Medium) |
| 892 | .Case("large", llvm::CodeModel::Large) |
| 893 | .Default(~0u); |
| 894 | if (CM != ~0u) { |
| 895 | llvm::CodeModel::Model codeModel = static_cast<llvm::CodeModel::Model>(CM); |
| 896 | getModule().setCodeModel(codeModel); |
| 897 | } |
| 898 | } |
| 899 | |
| 900 | if (CodeGenOpts.NoPLT) |
| 901 | getModule().setRtLibUseGOT(); |
| 902 | if (CodeGenOpts.UnwindTables) |
| 903 | getModule().setUwtable(llvm::UWTableKind(CodeGenOpts.UnwindTables)); |
| 904 | |
| 905 | switch (CodeGenOpts.getFramePointer()) { |
| 906 | case CodeGenOptions::FramePointerKind::None: |
| 907 | // 0 ("none") is the default. |
| 908 | break; |
| 909 | case CodeGenOptions::FramePointerKind::NonLeaf: |
| 910 | getModule().setFramePointer(llvm::FramePointerKind::NonLeaf); |
| 911 | break; |
| 912 | case CodeGenOptions::FramePointerKind::All: |
| 913 | getModule().setFramePointer(llvm::FramePointerKind::All); |
| 914 | break; |
| 915 | } |
| 916 | |
| 917 | SimplifyPersonality(); |
| 918 | |
| 919 | if (getCodeGenOpts().EmitDeclMetadata) |
| 920 | EmitDeclMetadata(); |
| 921 | |
| 922 | if (getCodeGenOpts().EmitGcovArcs || getCodeGenOpts().EmitGcovNotes) |
| 923 | EmitCoverageFile(); |
| 924 | |
| 925 | if (CGDebugInfo *DI = getModuleDebugInfo()) |
| 926 | DI->finalize(); |
| 927 | |
| 928 | if (getCodeGenOpts().EmitVersionIdentMetadata) |
| 929 | EmitVersionIdentMetadata(); |
| 930 | |
| 931 | if (!getCodeGenOpts().RecordCommandLine.empty()) |
| 932 | EmitCommandLineMetadata(); |
| 933 | |
| 934 | if (!getCodeGenOpts().StackProtectorGuard.empty()) |
| 935 | getModule().setStackProtectorGuard(getCodeGenOpts().StackProtectorGuard); |
| 936 | if (!getCodeGenOpts().StackProtectorGuardReg.empty()) |
| 937 | getModule().setStackProtectorGuardReg( |
| 938 | getCodeGenOpts().StackProtectorGuardReg); |
| 939 | if (!getCodeGenOpts().StackProtectorGuardSymbol.empty()) |
| 940 | getModule().setStackProtectorGuardSymbol( |
| 941 | getCodeGenOpts().StackProtectorGuardSymbol); |
| 942 | if (getCodeGenOpts().StackProtectorGuardOffset != INT_MAX2147483647) |
| 943 | getModule().setStackProtectorGuardOffset( |
| 944 | getCodeGenOpts().StackProtectorGuardOffset); |
| 945 | if (getCodeGenOpts().StackAlignment) |
| 946 | getModule().setOverrideStackAlignment(getCodeGenOpts().StackAlignment); |
| 947 | if (getCodeGenOpts().SkipRaxSetup) |
| 948 | getModule().addModuleFlag(llvm::Module::Override, "SkipRaxSetup", 1); |
| 949 | |
| 950 | getTargetCodeGenInfo().emitTargetMetadata(*this, MangledDeclNames); |
| 951 | |
| 952 | EmitBackendOptionsMetadata(getCodeGenOpts()); |
| 953 | |
| 954 | // If there is device offloading code embed it in the host now. |
| 955 | EmbedObject(&getModule(), CodeGenOpts, getDiags()); |
| 956 | |
| 957 | // Set visibility from DLL storage class |
| 958 | // We do this at the end of LLVM IR generation; after any operation |
| 959 | // that might affect the DLL storage class or the visibility, and |
| 960 | // before anything that might act on these. |
| 961 | setVisibilityFromDLLStorageClass(LangOpts, getModule()); |
| 962 | } |
| 963 | |
| 964 | void CodeGenModule::EmitOpenCLMetadata() { |
| 965 | // SPIR v2.0 s2.13 - The OpenCL version used by the module is stored in the |
| 966 | // opencl.ocl.version named metadata node. |
| 967 | // C++ for OpenCL has a distinct mapping for versions compatibile with OpenCL. |
| 968 | auto Version = LangOpts.getOpenCLCompatibleVersion(); |
| 969 | llvm::Metadata *OCLVerElts[] = { |
| 970 | llvm::ConstantAsMetadata::get(llvm::ConstantInt::get( |
| 971 | Int32Ty, Version / 100)), |
| 972 | llvm::ConstantAsMetadata::get(llvm::ConstantInt::get( |
| 973 | Int32Ty, (Version % 100) / 10))}; |
| 974 | llvm::NamedMDNode *OCLVerMD = |
| 975 | TheModule.getOrInsertNamedMetadata("opencl.ocl.version"); |
| 976 | llvm::LLVMContext &Ctx = TheModule.getContext(); |
| 977 | OCLVerMD->addOperand(llvm::MDNode::get(Ctx, OCLVerElts)); |
| 978 | } |
| 979 | |
| 980 | void CodeGenModule::EmitBackendOptionsMetadata( |
| 981 | const CodeGenOptions CodeGenOpts) { |
| 982 | if (getTriple().isRISCV()) { |
| 983 | getModule().addModuleFlag(llvm::Module::Error, "SmallDataLimit", |
| 984 | CodeGenOpts.SmallDataLimit); |
| 985 | } |
| 986 | } |
| 987 | |
| 988 | void CodeGenModule::UpdateCompletedType(const TagDecl *TD) { |
| 989 | // Make sure that this type is translated. |
| 990 | Types.UpdateCompletedType(TD); |
| 991 | } |
| 992 | |
| 993 | void CodeGenModule::RefreshTypeCacheForClass(const CXXRecordDecl *RD) { |
| 994 | // Make sure that this type is translated. |
| 995 | Types.RefreshTypeCacheForClass(RD); |
| 996 | } |
| 997 | |
| 998 | llvm::MDNode *CodeGenModule::getTBAATypeInfo(QualType QTy) { |
| 999 | if (!TBAA) |
| 1000 | return nullptr; |
| 1001 | return TBAA->getTypeInfo(QTy); |
| 1002 | } |
| 1003 | |
| 1004 | TBAAAccessInfo CodeGenModule::getTBAAAccessInfo(QualType AccessType) { |
| 1005 | if (!TBAA) |
| 1006 | return TBAAAccessInfo(); |
| 1007 | if (getLangOpts().CUDAIsDevice) { |
| 1008 | // As CUDA builtin surface/texture types are replaced, skip generating TBAA |
| 1009 | // access info. |
| 1010 | if (AccessType->isCUDADeviceBuiltinSurfaceType()) { |
| 1011 | if (getTargetCodeGenInfo().getCUDADeviceBuiltinSurfaceDeviceType() != |
| 1012 | nullptr) |
| 1013 | return TBAAAccessInfo(); |
| 1014 | } else if (AccessType->isCUDADeviceBuiltinTextureType()) { |
| 1015 | if (getTargetCodeGenInfo().getCUDADeviceBuiltinTextureDeviceType() != |
| 1016 | nullptr) |
| 1017 | return TBAAAccessInfo(); |
| 1018 | } |
| 1019 | } |
| 1020 | return TBAA->getAccessInfo(AccessType); |
| 1021 | } |
| 1022 | |
| 1023 | TBAAAccessInfo |
| 1024 | CodeGenModule::getTBAAVTablePtrAccessInfo(llvm::Type *VTablePtrType) { |
| 1025 | if (!TBAA) |
| 1026 | return TBAAAccessInfo(); |
| 1027 | return TBAA->getVTablePtrAccessInfo(VTablePtrType); |
| 1028 | } |
| 1029 | |
| 1030 | llvm::MDNode *CodeGenModule::getTBAAStructInfo(QualType QTy) { |
| 1031 | if (!TBAA) |
| 1032 | return nullptr; |
| 1033 | return TBAA->getTBAAStructInfo(QTy); |
| 1034 | } |
| 1035 | |
| 1036 | llvm::MDNode *CodeGenModule::getTBAABaseTypeInfo(QualType QTy) { |
| 1037 | if (!TBAA) |
| 1038 | return nullptr; |
| 1039 | return TBAA->getBaseTypeInfo(QTy); |
| 1040 | } |
| 1041 | |
| 1042 | llvm::MDNode *CodeGenModule::getTBAAAccessTagInfo(TBAAAccessInfo Info) { |
| 1043 | if (!TBAA) |
| 1044 | return nullptr; |
| 1045 | return TBAA->getAccessTagInfo(Info); |
| 1046 | } |
| 1047 | |
| 1048 | TBAAAccessInfo CodeGenModule::mergeTBAAInfoForCast(TBAAAccessInfo SourceInfo, |
| 1049 | TBAAAccessInfo TargetInfo) { |
| 1050 | if (!TBAA) |
| 1051 | return TBAAAccessInfo(); |
| 1052 | return TBAA->mergeTBAAInfoForCast(SourceInfo, TargetInfo); |
| 1053 | } |
| 1054 | |
| 1055 | TBAAAccessInfo |
| 1056 | CodeGenModule::mergeTBAAInfoForConditionalOperator(TBAAAccessInfo InfoA, |
| 1057 | TBAAAccessInfo InfoB) { |
| 1058 | if (!TBAA) |
| 1059 | return TBAAAccessInfo(); |
| 1060 | return TBAA->mergeTBAAInfoForConditionalOperator(InfoA, InfoB); |
| 1061 | } |
| 1062 | |
| 1063 | TBAAAccessInfo |
| 1064 | CodeGenModule::mergeTBAAInfoForMemoryTransfer(TBAAAccessInfo DestInfo, |
| 1065 | TBAAAccessInfo SrcInfo) { |
| 1066 | if (!TBAA) |
| 1067 | return TBAAAccessInfo(); |
| 1068 | return TBAA->mergeTBAAInfoForConditionalOperator(DestInfo, SrcInfo); |
| 1069 | } |
| 1070 | |
| 1071 | void CodeGenModule::DecorateInstructionWithTBAA(llvm::Instruction *Inst, |
| 1072 | TBAAAccessInfo TBAAInfo) { |
| 1073 | if (llvm::MDNode *Tag = getTBAAAccessTagInfo(TBAAInfo)) |
| 1074 | Inst->setMetadata(llvm::LLVMContext::MD_tbaa, Tag); |
| 1075 | } |
| 1076 | |
| 1077 | void CodeGenModule::DecorateInstructionWithInvariantGroup( |
| 1078 | llvm::Instruction *I, const CXXRecordDecl *RD) { |
| 1079 | I->setMetadata(llvm::LLVMContext::MD_invariant_group, |
| 1080 | llvm::MDNode::get(getLLVMContext(), {})); |
| 1081 | } |
| 1082 | |
| 1083 | void CodeGenModule::Error(SourceLocation loc, StringRef message) { |
| 1084 | unsigned diagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error, "%0"); |
| 1085 | getDiags().Report(Context.getFullLoc(loc), diagID) << message; |
| 1086 | } |
| 1087 | |
| 1088 | /// ErrorUnsupported - Print out an error that codegen doesn't support the |
| 1089 | /// specified stmt yet. |
| 1090 | void CodeGenModule::ErrorUnsupported(const Stmt *S, const char *Type) { |
| 1091 | unsigned DiagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error, |
| 1092 | "cannot compile this %0 yet"); |
| 1093 | std::string Msg = Type; |
| 1094 | getDiags().Report(Context.getFullLoc(S->getBeginLoc()), DiagID) |
| 1095 | << Msg << S->getSourceRange(); |
| 1096 | } |
| 1097 | |
| 1098 | /// ErrorUnsupported - Print out an error that codegen doesn't support the |
| 1099 | /// specified decl yet. |
| 1100 | void CodeGenModule::ErrorUnsupported(const Decl *D, const char *Type) { |
| 1101 | unsigned DiagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error, |
| 1102 | "cannot compile this %0 yet"); |
| 1103 | std::string Msg = Type; |
| 1104 | getDiags().Report(Context.getFullLoc(D->getLocation()), DiagID) << Msg; |
| 1105 | } |
| 1106 | |
| 1107 | llvm::ConstantInt *CodeGenModule::getSize(CharUnits size) { |
| 1108 | return llvm::ConstantInt::get(SizeTy, size.getQuantity()); |
| 1109 | } |
| 1110 | |
| 1111 | void CodeGenModule::setGlobalVisibility(llvm::GlobalValue *GV, |
| 1112 | const NamedDecl *D) const { |
| 1113 | // Internal definitions always have default visibility. |
| 1114 | if (GV->hasLocalLinkage()) { |
| 1115 | GV->setVisibility(llvm::GlobalValue::DefaultVisibility); |
| 1116 | return; |
| 1117 | } |
| 1118 | if (!D) |
| 1119 | return; |
| 1120 | // Set visibility for definitions, and for declarations if requested globally |
| 1121 | // or set explicitly. |
| 1122 | LinkageInfo LV = D->getLinkageAndVisibility(); |
| 1123 | if (GV->hasDLLExportStorageClass() || GV->hasDLLImportStorageClass()) { |
| 1124 | // Reject incompatible dlllstorage and visibility annotations. |
| 1125 | if (!LV.isVisibilityExplicit()) |
| 1126 | return; |
| 1127 | if (GV->hasDLLExportStorageClass()) { |
| 1128 | if (LV.getVisibility() == HiddenVisibility) |
| 1129 | getDiags().Report(D->getLocation(), |
| 1130 | diag::err_hidden_visibility_dllexport); |
| 1131 | } else if (LV.getVisibility() != DefaultVisibility) { |
| 1132 | getDiags().Report(D->getLocation(), |
| 1133 | diag::err_non_default_visibility_dllimport); |
| 1134 | } |
| 1135 | return; |
| 1136 | } |
| 1137 | |
| 1138 | if (LV.isVisibilityExplicit() || getLangOpts().SetVisibilityForExternDecls || |
| 1139 | !GV->isDeclarationForLinker()) |
| 1140 | GV->setVisibility(GetLLVMVisibility(LV.getVisibility())); |
| 1141 | } |
| 1142 | |
| 1143 | static bool shouldAssumeDSOLocal(const CodeGenModule &CGM, |
| 1144 | llvm::GlobalValue *GV) { |
| 1145 | if (GV->hasLocalLinkage()) |
| 1146 | return true; |
| 1147 | |
| 1148 | if (!GV->hasDefaultVisibility() && !GV->hasExternalWeakLinkage()) |
| 1149 | return true; |
| 1150 | |
| 1151 | // DLLImport explicitly marks the GV as external. |
| 1152 | if (GV->hasDLLImportStorageClass()) |
| 1153 | return false; |
| 1154 | |
| 1155 | const llvm::Triple &TT = CGM.getTriple(); |
| 1156 | if (TT.isWindowsGNUEnvironment()) { |
| 1157 | // In MinGW, variables without DLLImport can still be automatically |
| 1158 | // imported from a DLL by the linker; don't mark variables that |
| 1159 | // potentially could come from another DLL as DSO local. |
| 1160 | |
| 1161 | // With EmulatedTLS, TLS variables can be autoimported from other DLLs |
| 1162 | // (and this actually happens in the public interface of libstdc++), so |
| 1163 | // such variables can't be marked as DSO local. (Native TLS variables |
| 1164 | // can't be dllimported at all, though.) |
| 1165 | if (GV->isDeclarationForLinker() && isa<llvm::GlobalVariable>(GV) && |
| 1166 | (!GV->isThreadLocal() || CGM.getCodeGenOpts().EmulatedTLS)) |
| 1167 | return false; |
| 1168 | } |
| 1169 | |
| 1170 | // On COFF, don't mark 'extern_weak' symbols as DSO local. If these symbols |
| 1171 | // remain unresolved in the link, they can be resolved to zero, which is |
| 1172 | // outside the current DSO. |
| 1173 | if (TT.isOSBinFormatCOFF() && GV->hasExternalWeakLinkage()) |
| 1174 | return false; |
| 1175 | |
| 1176 | // Every other GV is local on COFF. |
| 1177 | // Make an exception for windows OS in the triple: Some firmware builds use |
| 1178 | // *-win32-macho triples. This (accidentally?) produced windows relocations |
| 1179 | // without GOT tables in older clang versions; Keep this behaviour. |
| 1180 | // FIXME: even thread local variables? |
| 1181 | if (TT.isOSBinFormatCOFF() || (TT.isOSWindows() && TT.isOSBinFormatMachO())) |
| 1182 | return true; |
| 1183 | |
| 1184 | // Only handle COFF and ELF for now. |
| 1185 | if (!TT.isOSBinFormatELF()) |
| 1186 | return false; |
| 1187 | |
| 1188 | // If this is not an executable, don't assume anything is local. |
| 1189 | const auto &CGOpts = CGM.getCodeGenOpts(); |
| 1190 | llvm::Reloc::Model RM = CGOpts.RelocationModel; |
| 1191 | const auto &LOpts = CGM.getLangOpts(); |
| 1192 | if (RM != llvm::Reloc::Static && !LOpts.PIE) { |
| 1193 | // On ELF, if -fno-semantic-interposition is specified and the target |
| 1194 | // supports local aliases, there will be neither CC1 |
| 1195 | // -fsemantic-interposition nor -fhalf-no-semantic-interposition. Set |
| 1196 | // dso_local on the function if using a local alias is preferable (can avoid |
| 1197 | // PLT indirection). |
| 1198 | if (!(isa<llvm::Function>(GV) && GV->canBenefitFromLocalAlias())) |
| 1199 | return false; |
| 1200 | return !(CGM.getLangOpts().SemanticInterposition || |
| 1201 | CGM.getLangOpts().HalfNoSemanticInterposition); |
| 1202 | } |
| 1203 | |
| 1204 | // A definition cannot be preempted from an executable. |
| 1205 | if (!GV->isDeclarationForLinker()) |
| 1206 | return true; |
| 1207 | |
| 1208 | // Most PIC code sequences that assume that a symbol is local cannot produce a |
| 1209 | // 0 if it turns out the symbol is undefined. While this is ABI and relocation |
| 1210 | // depended, it seems worth it to handle it here. |
| 1211 | if (RM == llvm::Reloc::PIC_ && GV->hasExternalWeakLinkage()) |
| 1212 | return false; |
| 1213 | |
| 1214 | // PowerPC64 prefers TOC indirection to avoid copy relocations. |
| 1215 | if (TT.isPPC64()) |
| 1216 | return false; |
| 1217 | |
| 1218 | if (CGOpts.DirectAccessExternalData) { |
| 1219 | // If -fdirect-access-external-data (default for -fno-pic), set dso_local |
| 1220 | // for non-thread-local variables. If the symbol is not defined in the |
| 1221 | // executable, a copy relocation will be needed at link time. dso_local is |
| 1222 | // excluded for thread-local variables because they generally don't support |
| 1223 | // copy relocations. |
| 1224 | if (auto *Var = dyn_cast<llvm::GlobalVariable>(GV)) |
| 1225 | if (!Var->isThreadLocal()) |
| 1226 | return true; |
| 1227 | |
| 1228 | // -fno-pic sets dso_local on a function declaration to allow direct |
| 1229 | // accesses when taking its address (similar to a data symbol). If the |
| 1230 | // function is not defined in the executable, a canonical PLT entry will be |
| 1231 | // needed at link time. -fno-direct-access-external-data can avoid the |
| 1232 | // canonical PLT entry. We don't generalize this condition to -fpie/-fpic as |
| 1233 | // it could just cause trouble without providing perceptible benefits. |
| 1234 | if (isa<llvm::Function>(GV) && !CGOpts.NoPLT && RM == llvm::Reloc::Static) |
| 1235 | return true; |
| 1236 | } |
| 1237 | |
| 1238 | // If we can use copy relocations we can assume it is local. |
| 1239 | |
| 1240 | // Otherwise don't assume it is local. |
| 1241 | return false; |
| 1242 | } |
| 1243 | |
| 1244 | void CodeGenModule::setDSOLocal(llvm::GlobalValue *GV) const { |
| 1245 | GV->setDSOLocal(shouldAssumeDSOLocal(*this, GV)); |
| 1246 | } |
| 1247 | |
| 1248 | void CodeGenModule::setDLLImportDLLExport(llvm::GlobalValue *GV, |
| 1249 | GlobalDecl GD) const { |
| 1250 | const auto *D = dyn_cast<NamedDecl>(GD.getDecl()); |
| 1251 | // C++ destructors have a few C++ ABI specific special cases. |
| 1252 | if (const auto *Dtor = dyn_cast_or_null<CXXDestructorDecl>(D)) { |
| 1253 | getCXXABI().setCXXDestructorDLLStorage(GV, Dtor, GD.getDtorType()); |
| 1254 | return; |
| 1255 | } |
| 1256 | setDLLImportDLLExport(GV, D); |
| 1257 | } |
| 1258 | |
| 1259 | void CodeGenModule::setDLLImportDLLExport(llvm::GlobalValue *GV, |
| 1260 | const NamedDecl *D) const { |
| 1261 | if (D && D->isExternallyVisible()) { |
| 1262 | if (D->hasAttr<DLLImportAttr>()) |
| 1263 | GV->setDLLStorageClass(llvm::GlobalVariable::DLLImportStorageClass); |
| 1264 | else if ((D->hasAttr<DLLExportAttr>() || |
| 1265 | shouldMapVisibilityToDLLExport(D)) && |
| 1266 | !GV->isDeclarationForLinker()) |
| 1267 | GV->setDLLStorageClass(llvm::GlobalVariable::DLLExportStorageClass); |
| 1268 | } |
| 1269 | } |
| 1270 | |
| 1271 | void CodeGenModule::setGVProperties(llvm::GlobalValue *GV, |
| 1272 | GlobalDecl GD) const { |
| 1273 | setDLLImportDLLExport(GV, GD); |
| 1274 | setGVPropertiesAux(GV, dyn_cast<NamedDecl>(GD.getDecl())); |
| 1275 | } |
| 1276 | |
| 1277 | void CodeGenModule::setGVProperties(llvm::GlobalValue *GV, |
| 1278 | const NamedDecl *D) const { |
| 1279 | setDLLImportDLLExport(GV, D); |
| 1280 | setGVPropertiesAux(GV, D); |
| 1281 | } |
| 1282 | |
| 1283 | void CodeGenModule::setGVPropertiesAux(llvm::GlobalValue *GV, |
| 1284 | const NamedDecl *D) const { |
| 1285 | setGlobalVisibility(GV, D); |
| 1286 | setDSOLocal(GV); |
| 1287 | GV->setPartition(CodeGenOpts.SymbolPartition); |
| 1288 | } |
| 1289 | |
| 1290 | static llvm::GlobalVariable::ThreadLocalMode GetLLVMTLSModel(StringRef S) { |
| 1291 | return llvm::StringSwitch<llvm::GlobalVariable::ThreadLocalMode>(S) |
| 1292 | .Case("global-dynamic", llvm::GlobalVariable::GeneralDynamicTLSModel) |
| 1293 | .Case("local-dynamic", llvm::GlobalVariable::LocalDynamicTLSModel) |
| 1294 | .Case("initial-exec", llvm::GlobalVariable::InitialExecTLSModel) |
| 1295 | .Case("local-exec", llvm::GlobalVariable::LocalExecTLSModel); |
| 1296 | } |
| 1297 | |
| 1298 | llvm::GlobalVariable::ThreadLocalMode |
| 1299 | CodeGenModule::GetDefaultLLVMTLSModel() const { |
| 1300 | switch (CodeGenOpts.getDefaultTLSModel()) { |
| 1301 | case CodeGenOptions::GeneralDynamicTLSModel: |
| 1302 | return llvm::GlobalVariable::GeneralDynamicTLSModel; |
| 1303 | case CodeGenOptions::LocalDynamicTLSModel: |
| 1304 | return llvm::GlobalVariable::LocalDynamicTLSModel; |
| 1305 | case CodeGenOptions::InitialExecTLSModel: |
| 1306 | return llvm::GlobalVariable::InitialExecTLSModel; |
| 1307 | case CodeGenOptions::LocalExecTLSModel: |
| 1308 | return llvm::GlobalVariable::LocalExecTLSModel; |
| 1309 | } |
| 1310 | llvm_unreachable("Invalid TLS model!")::llvm::llvm_unreachable_internal("Invalid TLS model!", "clang/lib/CodeGen/CodeGenModule.cpp" , 1310); |
| 1311 | } |
| 1312 | |
| 1313 | void CodeGenModule::setTLSMode(llvm::GlobalValue *GV, const VarDecl &D) const { |
| 1314 | 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!\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 1314, __extension__ __PRETTY_FUNCTION__ )); |
| 1315 | |
| 1316 | llvm::GlobalValue::ThreadLocalMode TLM; |
| 1317 | TLM = GetDefaultLLVMTLSModel(); |
| 1318 | |
| 1319 | // Override the TLS model if it is explicitly specified. |
| 1320 | if (const TLSModelAttr *Attr = D.getAttr<TLSModelAttr>()) { |
| 1321 | TLM = GetLLVMTLSModel(Attr->getModel()); |
| 1322 | } |
| 1323 | |
| 1324 | GV->setThreadLocalMode(TLM); |
| 1325 | } |
| 1326 | |
| 1327 | static std::string getCPUSpecificMangling(const CodeGenModule &CGM, |
| 1328 | StringRef Name) { |
| 1329 | const TargetInfo &Target = CGM.getTarget(); |
| 1330 | return (Twine('.') + Twine(Target.CPUSpecificManglingCharacter(Name))).str(); |
| 1331 | } |
| 1332 | |
| 1333 | static void AppendCPUSpecificCPUDispatchMangling(const CodeGenModule &CGM, |
| 1334 | const CPUSpecificAttr *Attr, |
| 1335 | unsigned CPUIndex, |
| 1336 | raw_ostream &Out) { |
| 1337 | // cpu_specific gets the current name, dispatch gets the resolver if IFunc is |
| 1338 | // supported. |
| 1339 | if (Attr) |
| 1340 | Out << getCPUSpecificMangling(CGM, Attr->getCPUName(CPUIndex)->getName()); |
| 1341 | else if (CGM.getTarget().supportsIFunc()) |
| 1342 | Out << ".resolver"; |
| 1343 | } |
| 1344 | |
| 1345 | static void AppendTargetVersionMangling(const CodeGenModule &CGM, |
| 1346 | const TargetVersionAttr *Attr, |
| 1347 | raw_ostream &Out) { |
| 1348 | if (Attr->isDefaultVersion()) |
| 1349 | return; |
| 1350 | Out << "._"; |
| 1351 | llvm::SmallVector<StringRef, 8> Feats; |
| 1352 | Attr->getFeatures(Feats); |
| 1353 | for (const auto &Feat : Feats) { |
| 1354 | Out << 'M'; |
| 1355 | Out << Feat; |
| 1356 | } |
| 1357 | } |
| 1358 | |
| 1359 | static void AppendTargetMangling(const CodeGenModule &CGM, |
| 1360 | const TargetAttr *Attr, raw_ostream &Out) { |
| 1361 | if (Attr->isDefaultVersion()) |
| 1362 | return; |
| 1363 | |
| 1364 | Out << '.'; |
| 1365 | const TargetInfo &Target = CGM.getTarget(); |
| 1366 | ParsedTargetAttr Info = Target.parseTargetAttr(Attr->getFeaturesStr()); |
| 1367 | llvm::sort(Info.Features, [&Target](StringRef LHS, StringRef RHS) { |
| 1368 | // Multiversioning doesn't allow "no-${feature}", so we can |
| 1369 | // only have "+" prefixes here. |
| 1370 | 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.\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 1371, __extension__ __PRETTY_FUNCTION__ )) |
| 1371 | "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.\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 1371, __extension__ __PRETTY_FUNCTION__ )); |
| 1372 | return Target.multiVersionSortPriority(LHS.substr(1)) > |
| 1373 | Target.multiVersionSortPriority(RHS.substr(1)); |
| 1374 | }); |
| 1375 | |
| 1376 | bool IsFirst = true; |
| 1377 | |
| 1378 | if (!Info.CPU.empty()) { |
| 1379 | IsFirst = false; |
| 1380 | Out << "arch_" << Info.CPU; |
| 1381 | } |
| 1382 | |
| 1383 | for (StringRef Feat : Info.Features) { |
| 1384 | if (!IsFirst) |
| 1385 | Out << '_'; |
| 1386 | IsFirst = false; |
| 1387 | Out << Feat.substr(1); |
| 1388 | } |
| 1389 | } |
| 1390 | |
| 1391 | // Returns true if GD is a function decl with internal linkage and |
| 1392 | // needs a unique suffix after the mangled name. |
| 1393 | static bool isUniqueInternalLinkageDecl(GlobalDecl GD, |
| 1394 | CodeGenModule &CGM) { |
| 1395 | const Decl *D = GD.getDecl(); |
| 1396 | return !CGM.getModuleNameHash().empty() && isa<FunctionDecl>(D) && |
| 1397 | (CGM.getFunctionLinkage(GD) == llvm::GlobalValue::InternalLinkage); |
| 1398 | } |
| 1399 | |
| 1400 | static void AppendTargetClonesMangling(const CodeGenModule &CGM, |
| 1401 | const TargetClonesAttr *Attr, |
| 1402 | unsigned VersionIndex, |
| 1403 | raw_ostream &Out) { |
| 1404 | if (CGM.getTarget().getTriple().isAArch64()) { |
| 1405 | StringRef FeatureStr = Attr->getFeatureStr(VersionIndex); |
| 1406 | if (FeatureStr == "default") |
| 1407 | return; |
| 1408 | Out << "._"; |
| 1409 | SmallVector<StringRef, 8> Features; |
| 1410 | FeatureStr.split(Features, "+"); |
| 1411 | for (auto &Feat : Features) { |
| 1412 | Out << 'M'; |
| 1413 | Out << Feat; |
| 1414 | } |
| 1415 | } else { |
| 1416 | Out << '.'; |
| 1417 | StringRef FeatureStr = Attr->getFeatureStr(VersionIndex); |
| 1418 | if (FeatureStr.startswith("arch=")) |
| 1419 | Out << "arch_" << FeatureStr.substr(sizeof("arch=") - 1); |
| 1420 | else |
| 1421 | Out << FeatureStr; |
| 1422 | |
| 1423 | Out << '.' << Attr->getMangledIndex(VersionIndex); |
| 1424 | } |
| 1425 | } |
| 1426 | |
| 1427 | static std::string getMangledNameImpl(CodeGenModule &CGM, GlobalDecl GD, |
| 1428 | const NamedDecl *ND, |
| 1429 | bool OmitMultiVersionMangling = false) { |
| 1430 | SmallString<256> Buffer; |
| 1431 | llvm::raw_svector_ostream Out(Buffer); |
| 1432 | MangleContext &MC = CGM.getCXXABI().getMangleContext(); |
| 1433 | if (!CGM.getModuleNameHash().empty()) |
| 1434 | MC.needsUniqueInternalLinkageNames(); |
| 1435 | bool ShouldMangle = MC.shouldMangleDeclName(ND); |
| 1436 | if (ShouldMangle) |
| 1437 | MC.mangleName(GD.getWithDecl(ND), Out); |
| 1438 | else { |
| 1439 | IdentifierInfo *II = ND->getIdentifier(); |
| 1440 | 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.\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 1440, __extension__ __PRETTY_FUNCTION__ )); |
| 1441 | const auto *FD = dyn_cast<FunctionDecl>(ND); |
| 1442 | |
| 1443 | if (FD && |
| 1444 | FD->getType()->castAs<FunctionType>()->getCallConv() == CC_X86RegCall) { |
| 1445 | Out << "__regcall3__" << II->getName(); |
| 1446 | } else if (FD && FD->hasAttr<CUDAGlobalAttr>() && |
| 1447 | GD.getKernelReferenceKind() == KernelReferenceKind::Stub) { |
| 1448 | Out << "__device_stub__" << II->getName(); |
| 1449 | } else { |
| 1450 | Out << II->getName(); |
| 1451 | } |
| 1452 | } |
| 1453 | |
| 1454 | // Check if the module name hash should be appended for internal linkage |
| 1455 | // symbols. This should come before multi-version target suffixes are |
| 1456 | // appended. This is to keep the name and module hash suffix of the |
| 1457 | // internal linkage function together. The unique suffix should only be |
| 1458 | // added when name mangling is done to make sure that the final name can |
| 1459 | // be properly demangled. For example, for C functions without prototypes, |
| 1460 | // name mangling is not done and the unique suffix should not be appeneded |
| 1461 | // then. |
| 1462 | if (ShouldMangle && isUniqueInternalLinkageDecl(GD, CGM)) { |
| 1463 | 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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 1464, __extension__ __PRETTY_FUNCTION__ )) |
| 1464 | "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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 1464, __extension__ __PRETTY_FUNCTION__ )); |
| 1465 | Out << CGM.getModuleNameHash(); |
| 1466 | } |
| 1467 | |
| 1468 | if (const auto *FD = dyn_cast<FunctionDecl>(ND)) |
| 1469 | if (FD->isMultiVersion() && !OmitMultiVersionMangling) { |
| 1470 | switch (FD->getMultiVersionKind()) { |
| 1471 | case MultiVersionKind::CPUDispatch: |
| 1472 | case MultiVersionKind::CPUSpecific: |
| 1473 | AppendCPUSpecificCPUDispatchMangling(CGM, |
| 1474 | FD->getAttr<CPUSpecificAttr>(), |
| 1475 | GD.getMultiVersionIndex(), Out); |
| 1476 | break; |
| 1477 | case MultiVersionKind::Target: |
| 1478 | AppendTargetMangling(CGM, FD->getAttr<TargetAttr>(), Out); |
| 1479 | break; |
| 1480 | case MultiVersionKind::TargetVersion: |
| 1481 | AppendTargetVersionMangling(CGM, FD->getAttr<TargetVersionAttr>(), Out); |
| 1482 | break; |
| 1483 | case MultiVersionKind::TargetClones: |
| 1484 | AppendTargetClonesMangling(CGM, FD->getAttr<TargetClonesAttr>(), |
| 1485 | GD.getMultiVersionIndex(), Out); |
| 1486 | break; |
| 1487 | case MultiVersionKind::None: |
| 1488 | llvm_unreachable("None multiversion type isn't valid here")::llvm::llvm_unreachable_internal("None multiversion type isn't valid here" , "clang/lib/CodeGen/CodeGenModule.cpp", 1488); |
| 1489 | } |
| 1490 | } |
| 1491 | |
| 1492 | // Make unique name for device side static file-scope variable for HIP. |
| 1493 | if (CGM.getContext().shouldExternalize(ND) && |
| 1494 | CGM.getLangOpts().GPURelocatableDeviceCode && |
| 1495 | CGM.getLangOpts().CUDAIsDevice) |
| 1496 | CGM.printPostfixForExternalizedDecl(Out, ND); |
| 1497 | |
| 1498 | return std::string(Out.str()); |
| 1499 | } |
| 1500 | |
| 1501 | void CodeGenModule::UpdateMultiVersionNames(GlobalDecl GD, |
| 1502 | const FunctionDecl *FD, |
| 1503 | StringRef &CurName) { |
| 1504 | if (!FD->isMultiVersion()) |
| 1505 | return; |
| 1506 | |
| 1507 | // Get the name of what this would be without the 'target' attribute. This |
| 1508 | // allows us to lookup the version that was emitted when this wasn't a |
| 1509 | // multiversion function. |
| 1510 | std::string NonTargetName = |
| 1511 | getMangledNameImpl(*this, GD, FD, /*OmitMultiVersionMangling=*/true); |
| 1512 | GlobalDecl OtherGD; |
| 1513 | if (lookupRepresentativeDecl(NonTargetName, OtherGD)) { |
| 1514 | 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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 1518, __extension__ __PRETTY_FUNCTION__ )) |
| 1515 | .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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 1518, __extension__ __PRETTY_FUNCTION__ )) |
| 1516 | ->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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 1518, __extension__ __PRETTY_FUNCTION__ )) |
| 1517 | ->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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 1518, __extension__ __PRETTY_FUNCTION__ )) |
| 1518 | "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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 1518, __extension__ __PRETTY_FUNCTION__ )); |
| 1519 | // OtherFD is the version of this function that was mangled BEFORE |
| 1520 | // becoming a MultiVersion function. It potentially needs to be updated. |
| 1521 | const FunctionDecl *OtherFD = OtherGD.getCanonicalDecl() |
| 1522 | .getDecl() |
| 1523 | ->getAsFunction() |
| 1524 | ->getMostRecentDecl(); |
| 1525 | std::string OtherName = getMangledNameImpl(*this, OtherGD, OtherFD); |
| 1526 | // This is so that if the initial version was already the 'default' |
| 1527 | // version, we don't try to update it. |
| 1528 | if (OtherName != NonTargetName) { |
| 1529 | // Remove instead of erase, since others may have stored the StringRef |
| 1530 | // to this. |
| 1531 | const auto ExistingRecord = Manglings.find(NonTargetName); |
| 1532 | if (ExistingRecord != std::end(Manglings)) |
| 1533 | Manglings.remove(&(*ExistingRecord)); |
| 1534 | auto Result = Manglings.insert(std::make_pair(OtherName, OtherGD)); |
| 1535 | StringRef OtherNameRef = MangledDeclNames[OtherGD.getCanonicalDecl()] = |
| 1536 | Result.first->first(); |
| 1537 | // If this is the current decl is being created, make sure we update the name. |
| 1538 | if (GD.getCanonicalDecl() == OtherGD.getCanonicalDecl()) |
| 1539 | CurName = OtherNameRef; |
| 1540 | if (llvm::GlobalValue *Entry = GetGlobalValue(NonTargetName)) |
| 1541 | Entry->setName(OtherName); |
| 1542 | } |
| 1543 | } |
| 1544 | } |
| 1545 | |
| 1546 | StringRef CodeGenModule::getMangledName(GlobalDecl GD) { |
| 1547 | GlobalDecl CanonicalGD = GD.getCanonicalDecl(); |
| 1548 | |
| 1549 | // Some ABIs don't have constructor variants. Make sure that base and |
| 1550 | // complete constructors get mangled the same. |
| 1551 | if (const auto *CD = dyn_cast<CXXConstructorDecl>(CanonicalGD.getDecl())) { |
| 1552 | if (!getTarget().getCXXABI().hasConstructorVariants()) { |
| 1553 | CXXCtorType OrigCtorType = GD.getCtorType(); |
| 1554 | 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" , "clang/lib/CodeGen/CodeGenModule.cpp", 1554, __extension__ __PRETTY_FUNCTION__ )); |
| 1555 | if (OrigCtorType == Ctor_Base) |
| 1556 | CanonicalGD = GlobalDecl(CD, Ctor_Complete); |
| 1557 | } |
| 1558 | } |
| 1559 | |
| 1560 | // In CUDA/HIP device compilation with -fgpu-rdc, the mangled name of a |
| 1561 | // static device variable depends on whether the variable is referenced by |
| 1562 | // a host or device host function. Therefore the mangled name cannot be |
| 1563 | // cached. |
| 1564 | if (!LangOpts.CUDAIsDevice || !getContext().mayExternalize(GD.getDecl())) { |
| 1565 | auto FoundName = MangledDeclNames.find(CanonicalGD); |
| 1566 | if (FoundName != MangledDeclNames.end()) |
| 1567 | return FoundName->second; |
| 1568 | } |
| 1569 | |
| 1570 | // Keep the first result in the case of a mangling collision. |
| 1571 | const auto *ND = cast<NamedDecl>(GD.getDecl()); |
| 1572 | std::string MangledName = getMangledNameImpl(*this, GD, ND); |
| 1573 | |
| 1574 | // Ensure either we have different ABIs between host and device compilations, |
| 1575 | // says host compilation following MSVC ABI but device compilation follows |
| 1576 | // Itanium C++ ABI or, if they follow the same ABI, kernel names after |
| 1577 | // mangling should be the same after name stubbing. The later checking is |
| 1578 | // very important as the device kernel name being mangled in host-compilation |
| 1579 | // is used to resolve the device binaries to be executed. Inconsistent naming |
| 1580 | // result in undefined behavior. Even though we cannot check that naming |
| 1581 | // directly between host- and device-compilations, the host- and |
| 1582 | // device-mangling in host compilation could help catching certain ones. |
| 1583 | assert(!isa<FunctionDecl>(ND) || !ND->hasAttr<CUDAGlobalAttr>() ||(static_cast <bool> (!isa<FunctionDecl>(ND) || !ND ->hasAttr<CUDAGlobalAttr>() || getContext().shouldExternalize (ND) || 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>() || getContext().shouldExternalize(ND) || getLangOpts().CUDAIsDevice || (getContext().getAuxTargetInfo() && (getContext().getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) == getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind::Kernel), ND)" , "clang/lib/CodeGen/CodeGenModule.cpp", 1592, __extension__ __PRETTY_FUNCTION__ )) |
| 1584 | getContext().shouldExternalize(ND) || getLangOpts().CUDAIsDevice ||(static_cast <bool> (!isa<FunctionDecl>(ND) || !ND ->hasAttr<CUDAGlobalAttr>() || getContext().shouldExternalize (ND) || 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>() || getContext().shouldExternalize(ND) || getLangOpts().CUDAIsDevice || (getContext().getAuxTargetInfo() && (getContext().getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) == getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind::Kernel), ND)" , "clang/lib/CodeGen/CodeGenModule.cpp", 1592, __extension__ __PRETTY_FUNCTION__ )) |
| 1585 | (getContext().getAuxTargetInfo() &&(static_cast <bool> (!isa<FunctionDecl>(ND) || !ND ->hasAttr<CUDAGlobalAttr>() || getContext().shouldExternalize (ND) || 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>() || getContext().shouldExternalize(ND) || getLangOpts().CUDAIsDevice || (getContext().getAuxTargetInfo() && (getContext().getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) == getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind::Kernel), ND)" , "clang/lib/CodeGen/CodeGenModule.cpp", 1592, __extension__ __PRETTY_FUNCTION__ )) |
| 1586 | (getContext().getAuxTargetInfo()->getCXXABI() !=(static_cast <bool> (!isa<FunctionDecl>(ND) || !ND ->hasAttr<CUDAGlobalAttr>() || getContext().shouldExternalize (ND) || 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>() || getContext().shouldExternalize(ND) || getLangOpts().CUDAIsDevice || (getContext().getAuxTargetInfo() && (getContext().getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) == getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind::Kernel), ND)" , "clang/lib/CodeGen/CodeGenModule.cpp", 1592, __extension__ __PRETTY_FUNCTION__ )) |
| 1587 | getContext().getTargetInfo().getCXXABI())) ||(static_cast <bool> (!isa<FunctionDecl>(ND) || !ND ->hasAttr<CUDAGlobalAttr>() || getContext().shouldExternalize (ND) || 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>() || getContext().shouldExternalize(ND) || getLangOpts().CUDAIsDevice || (getContext().getAuxTargetInfo() && (getContext().getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) == getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind::Kernel), ND)" , "clang/lib/CodeGen/CodeGenModule.cpp", 1592, __extension__ __PRETTY_FUNCTION__ )) |
| 1588 | getCUDARuntime().getDeviceSideName(ND) ==(static_cast <bool> (!isa<FunctionDecl>(ND) || !ND ->hasAttr<CUDAGlobalAttr>() || getContext().shouldExternalize (ND) || 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>() || getContext().shouldExternalize(ND) || getLangOpts().CUDAIsDevice || (getContext().getAuxTargetInfo() && (getContext().getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) == getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind::Kernel), ND)" , "clang/lib/CodeGen/CodeGenModule.cpp", 1592, __extension__ __PRETTY_FUNCTION__ )) |
| 1589 | getMangledNameImpl((static_cast <bool> (!isa<FunctionDecl>(ND) || !ND ->hasAttr<CUDAGlobalAttr>() || getContext().shouldExternalize (ND) || 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>() || getContext().shouldExternalize(ND) || getLangOpts().CUDAIsDevice || (getContext().getAuxTargetInfo() && (getContext().getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) == getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind::Kernel), ND)" , "clang/lib/CodeGen/CodeGenModule.cpp", 1592, __extension__ __PRETTY_FUNCTION__ )) |
| 1590 | *this,(static_cast <bool> (!isa<FunctionDecl>(ND) || !ND ->hasAttr<CUDAGlobalAttr>() || getContext().shouldExternalize (ND) || 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>() || getContext().shouldExternalize(ND) || getLangOpts().CUDAIsDevice || (getContext().getAuxTargetInfo() && (getContext().getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) == getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind::Kernel), ND)" , "clang/lib/CodeGen/CodeGenModule.cpp", 1592, __extension__ __PRETTY_FUNCTION__ )) |
| 1591 | GD.getWithKernelReferenceKind(KernelReferenceKind::Kernel),(static_cast <bool> (!isa<FunctionDecl>(ND) || !ND ->hasAttr<CUDAGlobalAttr>() || getContext().shouldExternalize (ND) || 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>() || getContext().shouldExternalize(ND) || getLangOpts().CUDAIsDevice || (getContext().getAuxTargetInfo() && (getContext().getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) == getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind::Kernel), ND)" , "clang/lib/CodeGen/CodeGenModule.cpp", 1592, __extension__ __PRETTY_FUNCTION__ )) |
| 1592 | ND))(static_cast <bool> (!isa<FunctionDecl>(ND) || !ND ->hasAttr<CUDAGlobalAttr>() || getContext().shouldExternalize (ND) || 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>() || getContext().shouldExternalize(ND) || getLangOpts().CUDAIsDevice || (getContext().getAuxTargetInfo() && (getContext().getAuxTargetInfo()->getCXXABI() != getContext().getTargetInfo().getCXXABI())) || getCUDARuntime().getDeviceSideName(ND) == getMangledNameImpl( *this, GD.getWithKernelReferenceKind(KernelReferenceKind::Kernel), ND)" , "clang/lib/CodeGen/CodeGenModule.cpp", 1592, __extension__ __PRETTY_FUNCTION__ )); |
| 1593 | |
| 1594 | auto Result = Manglings.insert(std::make_pair(MangledName, GD)); |
| 1595 | return MangledDeclNames[CanonicalGD] = Result.first->first(); |
| 1596 | } |
| 1597 | |
| 1598 | StringRef CodeGenModule::getBlockMangledName(GlobalDecl GD, |
| 1599 | const BlockDecl *BD) { |
| 1600 | MangleContext &MangleCtx = getCXXABI().getMangleContext(); |
| 1601 | const Decl *D = GD.getDecl(); |
| 1602 | |
| 1603 | SmallString<256> Buffer; |
| 1604 | llvm::raw_svector_ostream Out(Buffer); |
| 1605 | if (!D) |
| 1606 | MangleCtx.mangleGlobalBlock(BD, |
| 1607 | dyn_cast_or_null<VarDecl>(initializedGlobalDecl.getDecl()), Out); |
| 1608 | else if (const auto *CD = dyn_cast<CXXConstructorDecl>(D)) |
| 1609 | MangleCtx.mangleCtorBlock(CD, GD.getCtorType(), BD, Out); |
| 1610 | else if (const auto *DD = dyn_cast<CXXDestructorDecl>(D)) |
| 1611 | MangleCtx.mangleDtorBlock(DD, GD.getDtorType(), BD, Out); |
| 1612 | else |
| 1613 | MangleCtx.mangleBlock(cast<DeclContext>(D), BD, Out); |
| 1614 | |
| 1615 | auto Result = Manglings.insert(std::make_pair(Out.str(), BD)); |
| 1616 | return Result.first->first(); |
| 1617 | } |
| 1618 | |
| 1619 | const GlobalDecl CodeGenModule::getMangledNameDecl(StringRef Name) { |
| 1620 | auto it = MangledDeclNames.begin(); |
| 1621 | while (it != MangledDeclNames.end()) { |
| 1622 | if (it->second == Name) |
| 1623 | return it->first; |
| 1624 | it++; |
| 1625 | } |
| 1626 | return GlobalDecl(); |
| 1627 | } |
| 1628 | |
| 1629 | llvm::GlobalValue *CodeGenModule::GetGlobalValue(StringRef Name) { |
| 1630 | return getModule().getNamedValue(Name); |
| 1631 | } |
| 1632 | |
| 1633 | /// AddGlobalCtor - Add a function to the list that will be called before |
| 1634 | /// main() runs. |
| 1635 | void CodeGenModule::AddGlobalCtor(llvm::Function *Ctor, int Priority, |
| 1636 | unsigned LexOrder, |
| 1637 | llvm::Constant *AssociatedData) { |
| 1638 | // FIXME: Type coercion of void()* types. |
| 1639 | GlobalCtors.push_back(Structor(Priority, LexOrder, Ctor, AssociatedData)); |
| 1640 | } |
| 1641 | |
| 1642 | /// AddGlobalDtor - Add a function to the list that will be called |
| 1643 | /// when the module is unloaded. |
| 1644 | void CodeGenModule::AddGlobalDtor(llvm::Function *Dtor, int Priority, |
| 1645 | bool IsDtorAttrFunc) { |
| 1646 | if (CodeGenOpts.RegisterGlobalDtorsWithAtExit && |
| 1647 | (!getContext().getTargetInfo().getTriple().isOSAIX() || IsDtorAttrFunc)) { |
| 1648 | DtorsUsingAtExit[Priority].push_back(Dtor); |
| 1649 | return; |
| 1650 | } |
| 1651 | |
| 1652 | // FIXME: Type coercion of void()* types. |
| 1653 | GlobalDtors.push_back(Structor(Priority, ~0U, Dtor, nullptr)); |
| 1654 | } |
| 1655 | |
| 1656 | void CodeGenModule::EmitCtorList(CtorList &Fns, const char *GlobalName) { |
| 1657 | if (Fns.empty()) return; |
| 1658 | |
| 1659 | // Ctor function type is void()*. |
| 1660 | llvm::FunctionType* CtorFTy = llvm::FunctionType::get(VoidTy, false); |
| 1661 | llvm::Type *CtorPFTy = llvm::PointerType::get(CtorFTy, |
| 1662 | TheModule.getDataLayout().getProgramAddressSpace()); |
| 1663 | |
| 1664 | // Get the type of a ctor entry, { i32, void ()*, i8* }. |
| 1665 | llvm::StructType *CtorStructTy = llvm::StructType::get( |
| 1666 | Int32Ty, CtorPFTy, VoidPtrTy); |
| 1667 | |
| 1668 | // Construct the constructor and destructor arrays. |
| 1669 | ConstantInitBuilder builder(*this); |
| 1670 | auto ctors = builder.beginArray(CtorStructTy); |
| 1671 | for (const auto &I : Fns) { |
| 1672 | auto ctor = ctors.beginStruct(CtorStructTy); |
| 1673 | ctor.addInt(Int32Ty, I.Priority); |
| 1674 | ctor.add(llvm::ConstantExpr::getBitCast(I.Initializer, CtorPFTy)); |
| 1675 | if (I.AssociatedData) |
| 1676 | ctor.add(llvm::ConstantExpr::getBitCast(I.AssociatedData, VoidPtrTy)); |
| 1677 | else |
| 1678 | ctor.addNullPointer(VoidPtrTy); |
| 1679 | ctor.finishAndAddTo(ctors); |
| 1680 | } |
| 1681 | |
| 1682 | auto list = |
| 1683 | ctors.finishAndCreateGlobal(GlobalName, getPointerAlign(), |
| 1684 | /*constant*/ false, |
| 1685 | llvm::GlobalValue::AppendingLinkage); |
| 1686 | |
| 1687 | // The LTO linker doesn't seem to like it when we set an alignment |
| 1688 | // on appending variables. Take it off as a workaround. |
| 1689 | list->setAlignment(std::nullopt); |
| 1690 | |
| 1691 | Fns.clear(); |
| 1692 | } |
| 1693 | |
| 1694 | llvm::GlobalValue::LinkageTypes |
| 1695 | CodeGenModule::getFunctionLinkage(GlobalDecl GD) { |
| 1696 | const auto *D = cast<FunctionDecl>(GD.getDecl()); |
| 1697 | |
| 1698 | GVALinkage Linkage = getContext().GetGVALinkageForFunction(D); |
| 1699 | |
| 1700 | if (const auto *Dtor = dyn_cast<CXXDestructorDecl>(D)) |
| 1701 | return getCXXABI().getCXXDestructorLinkage(Linkage, Dtor, GD.getDtorType()); |
| 1702 | |
| 1703 | if (isa<CXXConstructorDecl>(D) && |
| 1704 | cast<CXXConstructorDecl>(D)->isInheritingConstructor() && |
| 1705 | Context.getTargetInfo().getCXXABI().isMicrosoft()) { |
| 1706 | // Our approach to inheriting constructors is fundamentally different from |
| 1707 | // that used by the MS ABI, so keep our inheriting constructor thunks |
| 1708 | // internal rather than trying to pick an unambiguous mangling for them. |
| 1709 | return llvm::GlobalValue::InternalLinkage; |
| 1710 | } |
| 1711 | |
| 1712 | return getLLVMLinkageForDeclarator(D, Linkage, /*IsConstantVariable=*/false); |
| 1713 | } |
| 1714 | |
| 1715 | llvm::ConstantInt *CodeGenModule::CreateCrossDsoCfiTypeId(llvm::Metadata *MD) { |
| 1716 | llvm::MDString *MDS = dyn_cast<llvm::MDString>(MD); |
| 1717 | if (!MDS) return nullptr; |
| 1718 | |
| 1719 | return llvm::ConstantInt::get(Int64Ty, llvm::MD5Hash(MDS->getString())); |
| 1720 | } |
| 1721 | |
| 1722 | llvm::ConstantInt *CodeGenModule::CreateKCFITypeId(QualType T) { |
| 1723 | if (auto *FnType = T->getAs<FunctionProtoType>()) |
| 1724 | T = getContext().getFunctionType( |
| 1725 | FnType->getReturnType(), FnType->getParamTypes(), |
| 1726 | FnType->getExtProtoInfo().withExceptionSpec(EST_None)); |
| 1727 | |
| 1728 | std::string OutName; |
| 1729 | llvm::raw_string_ostream Out(OutName); |
| 1730 | getCXXABI().getMangleContext().mangleTypeName(T, Out); |
| 1731 | |
| 1732 | return llvm::ConstantInt::get(Int32Ty, |
| 1733 | static_cast<uint32_t>(llvm::xxHash64(OutName))); |
| 1734 | } |
| 1735 | |
| 1736 | void CodeGenModule::SetLLVMFunctionAttributes(GlobalDecl GD, |
| 1737 | const CGFunctionInfo &Info, |
| 1738 | llvm::Function *F, bool IsThunk) { |
| 1739 | unsigned CallingConv; |
| 1740 | llvm::AttributeList PAL; |
| 1741 | ConstructAttributeList(F->getName(), Info, GD, PAL, CallingConv, |
| 1742 | /*AttrOnCallSite=*/false, IsThunk); |
| 1743 | F->setAttributes(PAL); |
| 1744 | F->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv)); |
| 1745 | } |
| 1746 | |
| 1747 | static void removeImageAccessQualifier(std::string& TyName) { |
| 1748 | std::string ReadOnlyQual("__read_only"); |
| 1749 | std::string::size_type ReadOnlyPos = TyName.find(ReadOnlyQual); |
| 1750 | if (ReadOnlyPos != std::string::npos) |
| 1751 | // "+ 1" for the space after access qualifier. |
| 1752 | TyName.erase(ReadOnlyPos, ReadOnlyQual.size() + 1); |
| 1753 | else { |
| 1754 | std::string WriteOnlyQual("__write_only"); |
| 1755 | std::string::size_type WriteOnlyPos = TyName.find(WriteOnlyQual); |
| 1756 | if (WriteOnlyPos != std::string::npos) |
| 1757 | TyName.erase(WriteOnlyPos, WriteOnlyQual.size() + 1); |
| 1758 | else { |
| 1759 | std::string ReadWriteQual("__read_write"); |
| 1760 | std::string::size_type ReadWritePos = TyName.find(ReadWriteQual); |
| 1761 | if (ReadWritePos != std::string::npos) |
| 1762 | TyName.erase(ReadWritePos, ReadWriteQual.size() + 1); |
| 1763 | } |
| 1764 | } |
| 1765 | } |
| 1766 | |
| 1767 | // Returns the address space id that should be produced to the |
| 1768 | // kernel_arg_addr_space metadata. This is always fixed to the ids |
| 1769 | // as specified in the SPIR 2.0 specification in order to differentiate |
| 1770 | // for example in clGetKernelArgInfo() implementation between the address |
| 1771 | // spaces with targets without unique mapping to the OpenCL address spaces |
| 1772 | // (basically all single AS CPUs). |
| 1773 | static unsigned ArgInfoAddressSpace(LangAS AS) { |
| 1774 | switch (AS) { |
| 1775 | case LangAS::opencl_global: |
| 1776 | return 1; |
| 1777 | case LangAS::opencl_constant: |
| 1778 | return 2; |
| 1779 | case LangAS::opencl_local: |
| 1780 | return 3; |
| 1781 | case LangAS::opencl_generic: |
| 1782 | return 4; // Not in SPIR 2.0 specs. |
| 1783 | case LangAS::opencl_global_device: |
| 1784 | return 5; |
| 1785 | case LangAS::opencl_global_host: |
| 1786 | return 6; |
| 1787 | default: |
| 1788 | return 0; // Assume private. |
| 1789 | } |
| 1790 | } |
| 1791 | |
| 1792 | void CodeGenModule::GenKernelArgMetadata(llvm::Function *Fn, |
| 1793 | const FunctionDecl *FD, |
| 1794 | CodeGenFunction *CGF) { |
| 1795 | 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!\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 1796, __extension__ __PRETTY_FUNCTION__ )) |
| 1796 | "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!\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 1796, __extension__ __PRETTY_FUNCTION__ )); |
| 1797 | // Create MDNodes that represent the kernel arg metadata. |
| 1798 | // Each MDNode is a list in the form of "key", N number of values which is |
| 1799 | // the same number of values as their are kernel arguments. |
| 1800 | |
| 1801 | const PrintingPolicy &Policy = Context.getPrintingPolicy(); |
| 1802 | |
| 1803 | // MDNode for the kernel argument address space qualifiers. |
| 1804 | SmallVector<llvm::Metadata *, 8> addressQuals; |
| 1805 | |
| 1806 | // MDNode for the kernel argument access qualifiers (images only). |
| 1807 | SmallVector<llvm::Metadata *, 8> accessQuals; |
| 1808 | |
| 1809 | // MDNode for the kernel argument type names. |
| 1810 | SmallVector<llvm::Metadata *, 8> argTypeNames; |
| 1811 | |
| 1812 | // MDNode for the kernel argument base type names. |
| 1813 | SmallVector<llvm::Metadata *, 8> argBaseTypeNames; |
| 1814 | |
| 1815 | // MDNode for the kernel argument type qualifiers. |
| 1816 | SmallVector<llvm::Metadata *, 8> argTypeQuals; |
| 1817 | |
| 1818 | // MDNode for the kernel argument names. |
| 1819 | SmallVector<llvm::Metadata *, 8> argNames; |
| 1820 | |
| 1821 | if (FD && CGF) |
| 1822 | for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { |
| 1823 | const ParmVarDecl *parm = FD->getParamDecl(i); |
| 1824 | // Get argument name. |
| 1825 | argNames.push_back(llvm::MDString::get(VMContext, parm->getName())); |
| 1826 | |
| 1827 | if (!getLangOpts().OpenCL) |
| 1828 | continue; |
| 1829 | QualType ty = parm->getType(); |
| 1830 | std::string typeQuals; |
| 1831 | |
| 1832 | // Get image and pipe access qualifier: |
| 1833 | if (ty->isImageType() || ty->isPipeType()) { |
| 1834 | const Decl *PDecl = parm; |
| 1835 | if (const auto *TD = ty->getAs<TypedefType>()) |
| 1836 | PDecl = TD->getDecl(); |
| 1837 | const OpenCLAccessAttr *A = PDecl->getAttr<OpenCLAccessAttr>(); |
| 1838 | if (A && A->isWriteOnly()) |
| 1839 | accessQuals.push_back(llvm::MDString::get(VMContext, "write_only")); |
| 1840 | else if (A && A->isReadWrite()) |
| 1841 | accessQuals.push_back(llvm::MDString::get(VMContext, "read_write")); |
| 1842 | else |
| 1843 | accessQuals.push_back(llvm::MDString::get(VMContext, "read_only")); |
| 1844 | } else |
| 1845 | accessQuals.push_back(llvm::MDString::get(VMContext, "none")); |
| 1846 | |
| 1847 | auto getTypeSpelling = [&](QualType Ty) { |
| 1848 | auto typeName = Ty.getUnqualifiedType().getAsString(Policy); |
| 1849 | |
| 1850 | if (Ty.isCanonical()) { |
| 1851 | StringRef typeNameRef = typeName; |
| 1852 | // Turn "unsigned type" to "utype" |
| 1853 | if (typeNameRef.consume_front("unsigned ")) |
| 1854 | return std::string("u") + typeNameRef.str(); |
| 1855 | if (typeNameRef.consume_front("signed ")) |
| 1856 | return typeNameRef.str(); |
| 1857 | } |
| 1858 | |
| 1859 | return typeName; |
| 1860 | }; |
| 1861 | |
| 1862 | if (ty->isPointerType()) { |
| 1863 | QualType pointeeTy = ty->getPointeeType(); |
| 1864 | |
| 1865 | // Get address qualifier. |
| 1866 | addressQuals.push_back( |
| 1867 | llvm::ConstantAsMetadata::get(CGF->Builder.getInt32( |
| 1868 | ArgInfoAddressSpace(pointeeTy.getAddressSpace())))); |
| 1869 | |
| 1870 | // Get argument type name. |
| 1871 | std::string typeName = getTypeSpelling(pointeeTy) + "*"; |
| 1872 | std::string baseTypeName = |
| 1873 | getTypeSpelling(pointeeTy.getCanonicalType()) + "*"; |
| 1874 | argTypeNames.push_back(llvm::MDString::get(VMContext, typeName)); |
| 1875 | argBaseTypeNames.push_back( |
| 1876 | llvm::MDString::get(VMContext, baseTypeName)); |
| 1877 | |
| 1878 | // Get argument type qualifiers: |
| 1879 | if (ty.isRestrictQualified()) |
| 1880 | typeQuals = "restrict"; |
| 1881 | if (pointeeTy.isConstQualified() || |
| 1882 | (pointeeTy.getAddressSpace() == LangAS::opencl_constant)) |
| 1883 | typeQuals += typeQuals.empty() ? "const" : " const"; |
| 1884 | if (pointeeTy.isVolatileQualified()) |
| 1885 | typeQuals += typeQuals.empty() ? "volatile" : " volatile"; |
| 1886 | } else { |
| 1887 | uint32_t AddrSpc = 0; |
| 1888 | bool isPipe = ty->isPipeType(); |
| 1889 | if (ty->isImageType() || isPipe) |
| 1890 | AddrSpc = ArgInfoAddressSpace(LangAS::opencl_global); |
| 1891 | |
| 1892 | addressQuals.push_back( |
| 1893 | llvm::ConstantAsMetadata::get(CGF->Builder.getInt32(AddrSpc))); |
| 1894 | |
| 1895 | // Get argument type name. |
| 1896 | ty = isPipe ? ty->castAs<PipeType>()->getElementType() : ty; |
| 1897 | std::string typeName = getTypeSpelling(ty); |
| 1898 | std::string baseTypeName = getTypeSpelling(ty.getCanonicalType()); |
| 1899 | |
| 1900 | // Remove access qualifiers on images |
| 1901 | // (as they are inseparable from type in clang implementation, |
| 1902 | // but OpenCL spec provides a special query to get access qualifier |
| 1903 | // via clGetKernelArgInfo with CL_KERNEL_ARG_ACCESS_QUALIFIER): |
| 1904 | if (ty->isImageType()) { |
| 1905 | removeImageAccessQualifier(typeName); |
| 1906 | removeImageAccessQualifier(baseTypeName); |
| 1907 | } |
| 1908 | |
| 1909 | argTypeNames.push_back(llvm::MDString::get(VMContext, typeName)); |
| 1910 | argBaseTypeNames.push_back( |
| 1911 | llvm::MDString::get(VMContext, baseTypeName)); |
| 1912 | |
| 1913 | if (isPipe) |
| 1914 | typeQuals = "pipe"; |
| 1915 | } |
| 1916 | argTypeQuals.push_back(llvm::MDString::get(VMContext, typeQuals)); |
| 1917 | } |
| 1918 | |
| 1919 | if (getLangOpts().OpenCL) { |
| 1920 | Fn->setMetadata("kernel_arg_addr_space", |
| 1921 | llvm::MDNode::get(VMContext, addressQuals)); |
| 1922 | Fn->setMetadata("kernel_arg_access_qual", |
| 1923 | llvm::MDNode::get(VMContext, accessQuals)); |
| 1924 | Fn->setMetadata("kernel_arg_type", |
| 1925 | llvm::MDNode::get(VMContext, argTypeNames)); |
| 1926 | Fn->setMetadata("kernel_arg_base_type", |
| 1927 | llvm::MDNode::get(VMContext, argBaseTypeNames)); |
| 1928 | Fn->setMetadata("kernel_arg_type_qual", |
| 1929 | llvm::MDNode::get(VMContext, argTypeQuals)); |
| 1930 | } |
| 1931 | if (getCodeGenOpts().EmitOpenCLArgMetadata || |
| 1932 | getCodeGenOpts().HIPSaveKernelArgName) |
| 1933 | Fn->setMetadata("kernel_arg_name", |
| 1934 | llvm::MDNode::get(VMContext, argNames)); |
| 1935 | } |
| 1936 | |
| 1937 | /// Determines whether the language options require us to model |
| 1938 | /// unwind exceptions. We treat -fexceptions as mandating this |
| 1939 | /// except under the fragile ObjC ABI with only ObjC exceptions |
| 1940 | /// enabled. This means, for example, that C with -fexceptions |
| 1941 | /// enables this. |
| 1942 | static bool hasUnwindExceptions(const LangOptions &LangOpts) { |
| 1943 | // If exceptions are completely disabled, obviously this is false. |
| 1944 | if (!LangOpts.Exceptions) return false; |
| 1945 | |
| 1946 | // If C++ exceptions are enabled, this is true. |
| 1947 | if (LangOpts.CXXExceptions) return true; |
| 1948 | |
| 1949 | // If ObjC exceptions are enabled, this depends on the ABI. |
| 1950 | if (LangOpts.ObjCExceptions) { |
| 1951 | return LangOpts.ObjCRuntime.hasUnwindExceptions(); |
| 1952 | } |
| 1953 | |
| 1954 | return true; |
| 1955 | } |
| 1956 | |
| 1957 | static bool requiresMemberFunctionPointerTypeMetadata(CodeGenModule &CGM, |
| 1958 | const CXXMethodDecl *MD) { |
| 1959 | // Check that the type metadata can ever actually be used by a call. |
| 1960 | if (!CGM.getCodeGenOpts().LTOUnit || |
| 1961 | !CGM.HasHiddenLTOVisibility(MD->getParent())) |
| 1962 | return false; |
| 1963 | |
| 1964 | // Only functions whose address can be taken with a member function pointer |
| 1965 | // need this sort of type metadata. |
| 1966 | return !MD->isStatic() && !MD->isVirtual() && !isa<CXXConstructorDecl>(MD) && |
| 1967 | !isa<CXXDestructorDecl>(MD); |
| 1968 | } |
| 1969 | |
| 1970 | std::vector<const CXXRecordDecl *> |
| 1971 | CodeGenModule::getMostBaseClasses(const CXXRecordDecl *RD) { |
| 1972 | llvm::SetVector<const CXXRecordDecl *> MostBases; |
| 1973 | |
| 1974 | std::function<void (const CXXRecordDecl *)> CollectMostBases; |
| 1975 | CollectMostBases = [&](const CXXRecordDecl *RD) { |
| 1976 | if (RD->getNumBases() == 0) |
| 1977 | MostBases.insert(RD); |
| 1978 | for (const CXXBaseSpecifier &B : RD->bases()) |
| 1979 | CollectMostBases(B.getType()->getAsCXXRecordDecl()); |
| 1980 | }; |
| 1981 | CollectMostBases(RD); |
| 1982 | return MostBases.takeVector(); |
| 1983 | } |
| 1984 | |
| 1985 | llvm::GlobalVariable * |
| 1986 | CodeGenModule::GetOrCreateRTTIProxyGlobalVariable(llvm::Constant *Addr) { |
| 1987 | auto It = RTTIProxyMap.find(Addr); |
| 1988 | if (It != RTTIProxyMap.end()) |
| 1989 | return It->second; |
| 1990 | |
| 1991 | auto *FTRTTIProxy = new llvm::GlobalVariable( |
| 1992 | TheModule, Addr->getType(), |
| 1993 | /*isConstant=*/true, llvm::GlobalValue::PrivateLinkage, Addr, |
| 1994 | "__llvm_rtti_proxy"); |
| 1995 | FTRTTIProxy->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global); |
| 1996 | |
| 1997 | RTTIProxyMap[Addr] = FTRTTIProxy; |
| 1998 | return FTRTTIProxy; |
| 1999 | } |
| 2000 | |
| 2001 | void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D, |
| 2002 | llvm::Function *F) { |
| 2003 | llvm::AttrBuilder B(F->getContext()); |
| 2004 | |
| 2005 | if ((!D || !D->hasAttr<NoUwtableAttr>()) && CodeGenOpts.UnwindTables) |
| 2006 | B.addUWTableAttr(llvm::UWTableKind(CodeGenOpts.UnwindTables)); |
| 2007 | |
| 2008 | if (CodeGenOpts.StackClashProtector) |
| 2009 | B.addAttribute("probe-stack", "inline-asm"); |
| 2010 | |
| 2011 | if (!hasUnwindExceptions(LangOpts)) |
| 2012 | B.addAttribute(llvm::Attribute::NoUnwind); |
| 2013 | |
| 2014 | if (D && D->hasAttr<NoStackProtectorAttr>()) |
| 2015 | ; // Do nothing. |
| 2016 | else if (D && D->hasAttr<StrictGuardStackCheckAttr>() && |
| 2017 | LangOpts.getStackProtector() == LangOptions::SSPOn) |
| 2018 | B.addAttribute(llvm::Attribute::StackProtectStrong); |
| 2019 | else if (LangOpts.getStackProtector() == LangOptions::SSPOn) |
| 2020 | B.addAttribute(llvm::Attribute::StackProtect); |
| 2021 | else if (LangOpts.getStackProtector() == LangOptions::SSPStrong) |
| 2022 | B.addAttribute(llvm::Attribute::StackProtectStrong); |
| 2023 | else if (LangOpts.getStackProtector() == LangOptions::SSPReq) |
| 2024 | B.addAttribute(llvm::Attribute::StackProtectReq); |
| 2025 | |
| 2026 | if (!D) { |
| 2027 | // If we don't have a declaration to control inlining, the function isn't |
| 2028 | // explicitly marked as alwaysinline for semantic reasons, and inlining is |
| 2029 | // disabled, mark the function as noinline. |
| 2030 | if (!F->hasFnAttribute(llvm::Attribute::AlwaysInline) && |
| 2031 | CodeGenOpts.getInlining() == CodeGenOptions::OnlyAlwaysInlining) |
| 2032 | B.addAttribute(llvm::Attribute::NoInline); |
| 2033 | |
| 2034 | F->addFnAttrs(B); |
| 2035 | return; |
| 2036 | } |
| 2037 | |
| 2038 | // Track whether we need to add the optnone LLVM attribute, |
| 2039 | // starting with the default for this optimization level. |
| 2040 | bool ShouldAddOptNone = |
| 2041 | !CodeGenOpts.DisableO0ImplyOptNone && CodeGenOpts.OptimizationLevel == 0; |
| 2042 | // We can't add optnone in the following cases, it won't pass the verifier. |
| 2043 | ShouldAddOptNone &= !D->hasAttr<MinSizeAttr>(); |
| 2044 | ShouldAddOptNone &= !D->hasAttr<AlwaysInlineAttr>(); |
| 2045 | |
| 2046 | // Add optnone, but do so only if the function isn't always_inline. |
| 2047 | if ((ShouldAddOptNone || D->hasAttr<OptimizeNoneAttr>()) && |
| 2048 | !F->hasFnAttribute(llvm::Attribute::AlwaysInline)) { |
| 2049 | B.addAttribute(llvm::Attribute::OptimizeNone); |
| 2050 | |
| 2051 | // OptimizeNone implies noinline; we should not be inlining such functions. |
| 2052 | B.addAttribute(llvm::Attribute::NoInline); |
| 2053 | |
| 2054 | // We still need to handle naked functions even though optnone subsumes |
| 2055 | // much of their semantics. |
| 2056 | if (D->hasAttr<NakedAttr>()) |
| 2057 | B.addAttribute(llvm::Attribute::Naked); |
| 2058 | |
| 2059 | // OptimizeNone wins over OptimizeForSize and MinSize. |
| 2060 | F->removeFnAttr(llvm::Attribute::OptimizeForSize); |
| 2061 | F->removeFnAttr(llvm::Attribute::MinSize); |
| 2062 | } else if (D->hasAttr<NakedAttr>()) { |
| 2063 | // Naked implies noinline: we should not be inlining such functions. |
| 2064 | B.addAttribute(llvm::Attribute::Naked); |
| 2065 | B.addAttribute(llvm::Attribute::NoInline); |
| 2066 | } else if (D->hasAttr<NoDuplicateAttr>()) { |
| 2067 | B.addAttribute(llvm::Attribute::NoDuplicate); |
| 2068 | } else if (D->hasAttr<NoInlineAttr>() && !F->hasFnAttribute(llvm::Attribute::AlwaysInline)) { |
| 2069 | // Add noinline if the function isn't always_inline. |
| 2070 | B.addAttribute(llvm::Attribute::NoInline); |
| 2071 | } else if (D->hasAttr<AlwaysInlineAttr>() && |
| 2072 | !F->hasFnAttribute(llvm::Attribute::NoInline)) { |
| 2073 | // (noinline wins over always_inline, and we can't specify both in IR) |
| 2074 | B.addAttribute(llvm::Attribute::AlwaysInline); |
| 2075 | } else if (CodeGenOpts.getInlining() == CodeGenOptions::OnlyAlwaysInlining) { |
| 2076 | // If we're not inlining, then force everything that isn't always_inline to |
| 2077 | // carry an explicit noinline attribute. |
| 2078 | if (!F->hasFnAttribute(llvm::Attribute::AlwaysInline)) |
| 2079 | B.addAttribute(llvm::Attribute::NoInline); |
| 2080 | } else { |
| 2081 | // Otherwise, propagate the inline hint attribute and potentially use its |
| 2082 | // absence to mark things as noinline. |
| 2083 | if (auto *FD = dyn_cast<FunctionDecl>(D)) { |
| 2084 | // Search function and template pattern redeclarations for inline. |
| 2085 | auto CheckForInline = [](const FunctionDecl *FD) { |
| 2086 | auto CheckRedeclForInline = [](const FunctionDecl *Redecl) { |
| 2087 | return Redecl->isInlineSpecified(); |
| 2088 | }; |
| 2089 | if (any_of(FD->redecls(), CheckRedeclForInline)) |
| 2090 | return true; |
| 2091 | const FunctionDecl *Pattern = FD->getTemplateInstantiationPattern(); |
| 2092 | if (!Pattern) |
| 2093 | return false; |
| 2094 | return any_of(Pattern->redecls(), CheckRedeclForInline); |
| 2095 | }; |
| 2096 | if (CheckForInline(FD)) { |
| 2097 | B.addAttribute(llvm::Attribute::InlineHint); |
| 2098 | } else if (CodeGenOpts.getInlining() == |
| 2099 | CodeGenOptions::OnlyHintInlining && |
| 2100 | !FD->isInlined() && |
| 2101 | !F->hasFnAttribute(llvm::Attribute::AlwaysInline)) { |
| 2102 | B.addAttribute(llvm::Attribute::NoInline); |
| 2103 | } |
| 2104 | } |
| 2105 | } |
| 2106 | |
| 2107 | // Add other optimization related attributes if we are optimizing this |
| 2108 | // function. |
| 2109 | if (!D->hasAttr<OptimizeNoneAttr>()) { |
| 2110 | if (D->hasAttr<ColdAttr>()) { |
| 2111 | if (!ShouldAddOptNone) |
| 2112 | B.addAttribute(llvm::Attribute::OptimizeForSize); |
| 2113 | B.addAttribute(llvm::Attribute::Cold); |
| 2114 | } |
| 2115 | if (D->hasAttr<HotAttr>()) |
| 2116 | B.addAttribute(llvm::Attribute::Hot); |
| 2117 | if (D->hasAttr<MinSizeAttr>()) |
| 2118 | B.addAttribute(llvm::Attribute::MinSize); |
| 2119 | } |
| 2120 | |
| 2121 | F->addFnAttrs(B); |
| 2122 | |
| 2123 | unsigned alignment = D->getMaxAlignment() / Context.getCharWidth(); |
| 2124 | if (alignment) |
| 2125 | F->setAlignment(llvm::Align(alignment)); |
| 2126 | |
| 2127 | if (!D->hasAttr<AlignedAttr>()) |
| 2128 | if (LangOpts.FunctionAlignment) |
| 2129 | F->setAlignment(llvm::Align(1ull << LangOpts.FunctionAlignment)); |
| 2130 | |
| 2131 | // Some C++ ABIs require 2-byte alignment for member functions, in order to |
| 2132 | // reserve a bit for differentiating between virtual and non-virtual member |
| 2133 | // functions. If the current target's C++ ABI requires this and this is a |
| 2134 | // member function, set its alignment accordingly. |
| 2135 | if (getTarget().getCXXABI().areMemberFunctionsAligned()) { |
| 2136 | if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D)) |
| 2137 | F->setAlignment(llvm::Align(2)); |
| 2138 | } |
| 2139 | |
| 2140 | // In the cross-dso CFI mode with canonical jump tables, we want !type |
| 2141 | // attributes on definitions only. |
| 2142 | if (CodeGenOpts.SanitizeCfiCrossDso && |
| 2143 | CodeGenOpts.SanitizeCfiCanonicalJumpTables) { |
| 2144 | if (auto *FD = dyn_cast<FunctionDecl>(D)) { |
| 2145 | // Skip available_externally functions. They won't be codegen'ed in the |
| 2146 | // current module anyway. |
| 2147 | if (getContext().GetGVALinkageForFunction(FD) != GVA_AvailableExternally) |
| 2148 | CreateFunctionTypeMetadataForIcall(FD, F); |
| 2149 | } |
| 2150 | } |
| 2151 | |
| 2152 | // Emit type metadata on member functions for member function pointer checks. |
| 2153 | // These are only ever necessary on definitions; we're guaranteed that the |
| 2154 | // definition will be present in the LTO unit as a result of LTO visibility. |
| 2155 | auto *MD = dyn_cast<CXXMethodDecl>(D); |
| 2156 | if (MD && requiresMemberFunctionPointerTypeMetadata(*this, MD)) { |
| 2157 | for (const CXXRecordDecl *Base : getMostBaseClasses(MD->getParent())) { |
| 2158 | llvm::Metadata *Id = |
| 2159 | CreateMetadataIdentifierForType(Context.getMemberPointerType( |
| 2160 | MD->getType(), Context.getRecordType(Base).getTypePtr())); |
| 2161 | F->addTypeMetadata(0, Id); |
| 2162 | } |
| 2163 | } |
| 2164 | } |
| 2165 | |
| 2166 | void CodeGenModule::setLLVMFunctionFEnvAttributes(const FunctionDecl *D, |
| 2167 | llvm::Function *F) { |
| 2168 | if (D->hasAttr<StrictFPAttr>()) { |
| 2169 | llvm::AttrBuilder FuncAttrs(F->getContext()); |
| 2170 | FuncAttrs.addAttribute("strictfp"); |
| 2171 | F->addFnAttrs(FuncAttrs); |
| 2172 | } |
| 2173 | } |
| 2174 | |
| 2175 | void CodeGenModule::SetCommonAttributes(GlobalDecl GD, llvm::GlobalValue *GV) { |
| 2176 | const Decl *D = GD.getDecl(); |
| 2177 | if (isa_and_nonnull<NamedDecl>(D)) |
| 2178 | setGVProperties(GV, GD); |
| 2179 | else |
| 2180 | GV->setVisibility(llvm::GlobalValue::DefaultVisibility); |
| 2181 | |
| 2182 | if (D && D->hasAttr<UsedAttr>()) |
| 2183 | addUsedOrCompilerUsedGlobal(GV); |
| 2184 | |
| 2185 | if (CodeGenOpts.KeepStaticConsts && D && isa<VarDecl>(D)) { |
| 2186 | const auto *VD = cast<VarDecl>(D); |
| 2187 | if (VD->getType().isConstQualified() && |
| 2188 | VD->getStorageDuration() == SD_Static) |
| 2189 | addUsedOrCompilerUsedGlobal(GV); |
| 2190 | } |
| 2191 | } |
| 2192 | |
| 2193 | bool CodeGenModule::GetCPUAndFeaturesAttributes(GlobalDecl GD, |
| 2194 | llvm::AttrBuilder &Attrs) { |
| 2195 | // Add target-cpu and target-features attributes to functions. If |
| 2196 | // we have a decl for the function and it has a target attribute then |
| 2197 | // parse that and add it to the feature set. |
| 2198 | StringRef TargetCPU = getTarget().getTargetOpts().CPU; |
| 2199 | StringRef TuneCPU = getTarget().getTargetOpts().TuneCPU; |
| 2200 | std::vector<std::string> Features; |
| 2201 | const auto *FD = dyn_cast_or_null<FunctionDecl>(GD.getDecl()); |
| 2202 | FD = FD ? FD->getMostRecentDecl() : FD; |
| 2203 | const auto *TD = FD ? FD->getAttr<TargetAttr>() : nullptr; |
| 2204 | const auto *TV = FD ? FD->getAttr<TargetVersionAttr>() : nullptr; |
| 2205 | assert((!TD || !TV) && "both target_version and target specified")(static_cast <bool> ((!TD || !TV) && "both target_version and target specified" ) ? void (0) : __assert_fail ("(!TD || !TV) && \"both target_version and target specified\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 2205, __extension__ __PRETTY_FUNCTION__ )); |
| 2206 | const auto *SD = FD ? FD->getAttr<CPUSpecificAttr>() : nullptr; |
| 2207 | const auto *TC = FD ? FD->getAttr<TargetClonesAttr>() : nullptr; |
| 2208 | bool AddedAttr = false; |
| 2209 | if (TD || TV || SD || TC) { |
| 2210 | llvm::StringMap<bool> FeatureMap; |
| 2211 | getContext().getFunctionFeatureMap(FeatureMap, GD); |
| 2212 | |
| 2213 | // Produce the canonical string for this set of features. |
| 2214 | for (const llvm::StringMap<bool>::value_type &Entry : FeatureMap) |
| 2215 | Features.push_back((Entry.getValue() ? "+" : "-") + Entry.getKey().str()); |
| 2216 | |
| 2217 | // Now add the target-cpu and target-features to the function. |
| 2218 | // While we populated the feature map above, we still need to |
| 2219 | // get and parse the target attribute so we can get the cpu for |
| 2220 | // the function. |
| 2221 | if (TD) { |
| 2222 | ParsedTargetAttr ParsedAttr = |
| 2223 | Target.parseTargetAttr(TD->getFeaturesStr()); |
| 2224 | if (!ParsedAttr.CPU.empty() && |
| 2225 | getTarget().isValidCPUName(ParsedAttr.CPU)) { |
| 2226 | TargetCPU = ParsedAttr.CPU; |
| 2227 | TuneCPU = ""; // Clear the tune CPU. |
| 2228 | } |
| 2229 | if (!ParsedAttr.Tune.empty() && |
| 2230 | getTarget().isValidCPUName(ParsedAttr.Tune)) |
| 2231 | TuneCPU = ParsedAttr.Tune; |
| 2232 | } |
| 2233 | |
| 2234 | if (SD) { |
| 2235 | // Apply the given CPU name as the 'tune-cpu' so that the optimizer can |
| 2236 | // favor this processor. |
| 2237 | TuneCPU = getTarget().getCPUSpecificTuneName( |
| 2238 | SD->getCPUName(GD.getMultiVersionIndex())->getName()); |
| 2239 | } |
| 2240 | } else { |
| 2241 | // Otherwise just add the existing target cpu and target features to the |
| 2242 | // function. |
| 2243 | Features = getTarget().getTargetOpts().Features; |
| 2244 | } |
| 2245 | |
| 2246 | if (!TargetCPU.empty()) { |
| 2247 | Attrs.addAttribute("target-cpu", TargetCPU); |
| 2248 | AddedAttr = true; |
| 2249 | } |
| 2250 | if (!TuneCPU.empty()) { |
| 2251 | Attrs.addAttribute("tune-cpu", TuneCPU); |
| 2252 | AddedAttr = true; |
| 2253 | } |
| 2254 | if (!Features.empty()) { |
| 2255 | llvm::sort(Features); |
| 2256 | Attrs.addAttribute("target-features", llvm::join(Features, ",")); |
| 2257 | AddedAttr = true; |
| 2258 | } |
| 2259 | |
| 2260 | return AddedAttr; |
| 2261 | } |
| 2262 | |
| 2263 | void CodeGenModule::setNonAliasAttributes(GlobalDecl GD, |
| 2264 | llvm::GlobalObject *GO) { |
| 2265 | const Decl *D = GD.getDecl(); |
| 2266 | SetCommonAttributes(GD, GO); |
| 2267 | |
| 2268 | if (D) { |
| 2269 | if (auto *GV = dyn_cast<llvm::GlobalVariable>(GO)) { |
| 2270 | if (D->hasAttr<RetainAttr>()) |
| 2271 | addUsedGlobal(GV); |
| 2272 | if (auto *SA = D->getAttr<PragmaClangBSSSectionAttr>()) |
| 2273 | GV->addAttribute("bss-section", SA->getName()); |
| 2274 | if (auto *SA = D->getAttr<PragmaClangDataSectionAttr>()) |
| 2275 | GV->addAttribute("data-section", SA->getName()); |
| 2276 | if (auto *SA = D->getAttr<PragmaClangRodataSectionAttr>()) |
| 2277 | GV->addAttribute("rodata-section", SA->getName()); |
| 2278 | if (auto *SA = D->getAttr<PragmaClangRelroSectionAttr>()) |
| 2279 | GV->addAttribute("relro-section", SA->getName()); |
| 2280 | } |
| 2281 | |
| 2282 | if (auto *F = dyn_cast<llvm::Function>(GO)) { |
| 2283 | if (D->hasAttr<RetainAttr>()) |
| 2284 | addUsedGlobal(F); |
| 2285 | if (auto *SA = D->getAttr<PragmaClangTextSectionAttr>()) |
| 2286 | if (!D->getAttr<SectionAttr>()) |
| 2287 | F->addFnAttr("implicit-section-name", SA->getName()); |
| 2288 | |
| 2289 | llvm::AttrBuilder Attrs(F->getContext()); |
| 2290 | if (GetCPUAndFeaturesAttributes(GD, Attrs)) { |
| 2291 | // We know that GetCPUAndFeaturesAttributes will always have the |
| 2292 | // newest set, since it has the newest possible FunctionDecl, so the |
| 2293 | // new ones should replace the old. |
| 2294 | llvm::AttributeMask RemoveAttrs; |
| 2295 | RemoveAttrs.addAttribute("target-cpu"); |
| 2296 | RemoveAttrs.addAttribute("target-features"); |
| 2297 | RemoveAttrs.addAttribute("tune-cpu"); |
| 2298 | F->removeFnAttrs(RemoveAttrs); |
| 2299 | F->addFnAttrs(Attrs); |
| 2300 | } |
| 2301 | } |
| 2302 | |
| 2303 | if (const auto *CSA = D->getAttr<CodeSegAttr>()) |
| 2304 | GO->setSection(CSA->getName()); |
| 2305 | else if (const auto *SA = D->getAttr<SectionAttr>()) |
| 2306 | GO->setSection(SA->getName()); |
| 2307 | } |
| 2308 | |
| 2309 | getTargetCodeGenInfo().setTargetAttributes(D, GO, *this); |
| 2310 | } |
| 2311 | |
| 2312 | void CodeGenModule::SetInternalFunctionAttributes(GlobalDecl GD, |
| 2313 | llvm::Function *F, |
| 2314 | const CGFunctionInfo &FI) { |
| 2315 | const Decl *D = GD.getDecl(); |
| 2316 | SetLLVMFunctionAttributes(GD, FI, F, /*IsThunk=*/false); |
| 2317 | SetLLVMFunctionAttributesForDefinition(D, F); |
| 2318 | |
| 2319 | F->setLinkage(llvm::Function::InternalLinkage); |
| 2320 | |
| 2321 | setNonAliasAttributes(GD, F); |
| 2322 | } |
| 2323 | |
| 2324 | static void setLinkageForGV(llvm::GlobalValue *GV, const NamedDecl *ND) { |
| 2325 | // Set linkage and visibility in case we never see a definition. |
| 2326 | LinkageInfo LV = ND->getLinkageAndVisibility(); |
| 2327 | // Don't set internal linkage on declarations. |
| 2328 | // "extern_weak" is overloaded in LLVM; we probably should have |
| 2329 | // separate linkage types for this. |
| 2330 | if (isExternallyVisible(LV.getLinkage()) && |
| 2331 | (ND->hasAttr<WeakAttr>() || ND->isWeakImported())) |
| 2332 | GV->setLinkage(llvm::GlobalValue::ExternalWeakLinkage); |
| 2333 | } |
| 2334 | |
| 2335 | void CodeGenModule::CreateFunctionTypeMetadataForIcall(const FunctionDecl *FD, |
| 2336 | llvm::Function *F) { |
| 2337 | // Only if we are checking indirect calls. |
| 2338 | if (!LangOpts.Sanitize.has(SanitizerKind::CFIICall)) |
| 2339 | return; |
| 2340 | |
| 2341 | // Non-static class methods are handled via vtable or member function pointer |
| 2342 | // checks elsewhere. |
| 2343 | if (isa<CXXMethodDecl>(FD) && !cast<CXXMethodDecl>(FD)->isStatic()) |
| 2344 | return; |
| 2345 | |
| 2346 | llvm::Metadata *MD = CreateMetadataIdentifierForType(FD->getType()); |
| 2347 | F->addTypeMetadata(0, MD); |
| 2348 | F->addTypeMetadata(0, CreateMetadataIdentifierGeneralized(FD->getType())); |
| 2349 | |
| 2350 | // Emit a hash-based bit set entry for cross-DSO calls. |
| 2351 | if (CodeGenOpts.SanitizeCfiCrossDso) |
| 2352 | if (auto CrossDsoTypeId = CreateCrossDsoCfiTypeId(MD)) |
| 2353 | F->addTypeMetadata(0, llvm::ConstantAsMetadata::get(CrossDsoTypeId)); |
| 2354 | } |
| 2355 | |
| 2356 | void CodeGenModule::setKCFIType(const FunctionDecl *FD, llvm::Function *F) { |
| 2357 | if (isa<CXXMethodDecl>(FD) && !cast<CXXMethodDecl>(FD)->isStatic()) |
| 2358 | return; |
| 2359 | |
| 2360 | llvm::LLVMContext &Ctx = F->getContext(); |
| 2361 | llvm::MDBuilder MDB(Ctx); |
| 2362 | F->setMetadata(llvm::LLVMContext::MD_kcfi_type, |
| 2363 | llvm::MDNode::get( |
| 2364 | Ctx, MDB.createConstant(CreateKCFITypeId(FD->getType())))); |
| 2365 | } |
| 2366 | |
| 2367 | static bool allowKCFIIdentifier(StringRef Name) { |
| 2368 | // KCFI type identifier constants are only necessary for external assembly |
| 2369 | // functions, which means it's safe to skip unusual names. Subset of |
| 2370 | // MCAsmInfo::isAcceptableChar() and MCAsmInfoXCOFF::isAcceptableChar(). |
| 2371 | return llvm::all_of(Name, [](const char &C) { |
| 2372 | return llvm::isAlnum(C) || C == '_' || C == '.'; |
| 2373 | }); |
| 2374 | } |
| 2375 | |
| 2376 | void CodeGenModule::finalizeKCFITypes() { |
| 2377 | llvm::Module &M = getModule(); |
| 2378 | for (auto &F : M.functions()) { |
| 2379 | // Remove KCFI type metadata from non-address-taken local functions. |
| 2380 | bool AddressTaken = F.hasAddressTaken(); |
| 2381 | if (!AddressTaken && F.hasLocalLinkage()) |
| 2382 | F.eraseMetadata(llvm::LLVMContext::MD_kcfi_type); |
| 2383 | |
| 2384 | // Generate a constant with the expected KCFI type identifier for all |
| 2385 | // address-taken function declarations to support annotating indirectly |
| 2386 | // called assembly functions. |
| 2387 | if (!AddressTaken || !F.isDeclaration()) |
| 2388 | continue; |
| 2389 | |
| 2390 | const llvm::ConstantInt *Type; |
| 2391 | if (const llvm::MDNode *MD = F.getMetadata(llvm::LLVMContext::MD_kcfi_type)) |
| 2392 | Type = llvm::mdconst::extract<llvm::ConstantInt>(MD->getOperand(0)); |
| 2393 | else |
| 2394 | continue; |
| 2395 | |
| 2396 | StringRef Name = F.getName(); |
| 2397 | if (!allowKCFIIdentifier(Name)) |
| 2398 | continue; |
| 2399 | |
| 2400 | std::string Asm = (".weak __kcfi_typeid_" + Name + "\n.set __kcfi_typeid_" + |
| 2401 | Name + ", " + Twine(Type->getZExtValue()) + "\n") |
| 2402 | .str(); |
| 2403 | M.appendModuleInlineAsm(Asm); |
| 2404 | } |
| 2405 | } |
| 2406 | |
| 2407 | void CodeGenModule::SetFunctionAttributes(GlobalDecl GD, llvm::Function *F, |
| 2408 | bool IsIncompleteFunction, |
| 2409 | bool IsThunk) { |
| 2410 | |
| 2411 | if (llvm::Intrinsic::ID IID = F->getIntrinsicID()) { |
| 2412 | // If this is an intrinsic function, set the function's attributes |
| 2413 | // to the intrinsic's attributes. |
| 2414 | F->setAttributes(llvm::Intrinsic::getAttributes(getLLVMContext(), IID)); |
| 2415 | return; |
| 2416 | } |
| 2417 | |
| 2418 | const auto *FD = cast<FunctionDecl>(GD.getDecl()); |
| 2419 | |
| 2420 | if (!IsIncompleteFunction) |
| 2421 | SetLLVMFunctionAttributes(GD, getTypes().arrangeGlobalDeclaration(GD), F, |
| 2422 | IsThunk); |
| 2423 | |
| 2424 | // Add the Returned attribute for "this", except for iOS 5 and earlier |
| 2425 | // where substantial code, including the libstdc++ dylib, was compiled with |
| 2426 | // GCC and does not actually return "this". |
| 2427 | if (!IsThunk && getCXXABI().HasThisReturn(GD) && |
| 2428 | !(getTriple().isiOS() && getTriple().isOSVersionLT(6))) { |
| 2429 | 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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 2432, __extension__ __PRETTY_FUNCTION__ )) |
| 2430 | 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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 2432, __extension__ __PRETTY_FUNCTION__ )) |
| 2431 | ->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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 2432, __extension__ __PRETTY_FUNCTION__ )) |
| 2432 | "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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 2432, __extension__ __PRETTY_FUNCTION__ )); |
| 2433 | F->addParamAttr(0, llvm::Attribute::Returned); |
| 2434 | } |
| 2435 | |
| 2436 | // Only a few attributes are set on declarations; these may later be |
| 2437 | // overridden by a definition. |
| 2438 | |
| 2439 | setLinkageForGV(F, FD); |
| 2440 | setGVProperties(F, FD); |
| 2441 | |
| 2442 | // Setup target-specific attributes. |
| 2443 | if (!IsIncompleteFunction && F->isDeclaration()) |
| 2444 | getTargetCodeGenInfo().setTargetAttributes(FD, F, *this); |
| 2445 | |
| 2446 | if (const auto *CSA = FD->getAttr<CodeSegAttr>()) |
| 2447 | F->setSection(CSA->getName()); |
| 2448 | else if (const auto *SA = FD->getAttr<SectionAttr>()) |
| 2449 | F->setSection(SA->getName()); |
| 2450 | |
| 2451 | if (const auto *EA = FD->getAttr<ErrorAttr>()) { |
| 2452 | if (EA->isError()) |
| 2453 | F->addFnAttr("dontcall-error", EA->getUserDiagnostic()); |
| 2454 | else if (EA->isWarning()) |
| 2455 | F->addFnAttr("dontcall-warn", EA->getUserDiagnostic()); |
| 2456 | } |
| 2457 | |
| 2458 | // If we plan on emitting this inline builtin, we can't treat it as a builtin. |
| 2459 | if (FD->isInlineBuiltinDeclaration()) { |
| 2460 | const FunctionDecl *FDBody; |
| 2461 | bool HasBody = FD->hasBody(FDBody); |
| 2462 | (void)HasBody; |
| 2463 | 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!\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 2464, __extension__ __PRETTY_FUNCTION__ )) |
| 2464 | "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!\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 2464, __extension__ __PRETTY_FUNCTION__ )); |
| 2465 | if (shouldEmitFunction(FDBody)) |
| 2466 | F->addFnAttr(llvm::Attribute::NoBuiltin); |
| 2467 | } |
| 2468 | |
| 2469 | if (FD->isReplaceableGlobalAllocationFunction()) { |
| 2470 | // A replaceable global allocation function does not act like a builtin by |
| 2471 | // default, only if it is invoked by a new-expression or delete-expression. |
| 2472 | F->addFnAttr(llvm::Attribute::NoBuiltin); |
| 2473 | } |
| 2474 | |
| 2475 | if (isa<CXXConstructorDecl>(FD) || isa<CXXDestructorDecl>(FD)) |
| 2476 | F->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global); |
| 2477 | else if (const auto *MD = dyn_cast<CXXMethodDecl>(FD)) |
| 2478 | if (MD->isVirtual()) |
| 2479 | F->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global); |
| 2480 | |
| 2481 | // Don't emit entries for function declarations in the cross-DSO mode. This |
| 2482 | // is handled with better precision by the receiving DSO. But if jump tables |
| 2483 | // are non-canonical then we need type metadata in order to produce the local |
| 2484 | // jump table. |
| 2485 | if (!CodeGenOpts.SanitizeCfiCrossDso || |
| 2486 | !CodeGenOpts.SanitizeCfiCanonicalJumpTables) |
| 2487 | CreateFunctionTypeMetadataForIcall(FD, F); |
| 2488 | |
| 2489 | if (LangOpts.Sanitize.has(SanitizerKind::KCFI)) |
| 2490 | setKCFIType(FD, F); |
| 2491 | |
| 2492 | if (getLangOpts().OpenMP && FD->hasAttr<OMPDeclareSimdDeclAttr>()) |
| 2493 | getOpenMPRuntime().emitDeclareSimdFunction(FD, F); |
| 2494 | |
| 2495 | if (CodeGenOpts.InlineMaxStackSize != UINT_MAX(2147483647 *2U +1U)) |
| 2496 | F->addFnAttr("inline-max-stacksize", llvm::utostr(CodeGenOpts.InlineMaxStackSize)); |
| 2497 | |
| 2498 | if (const auto *CB = FD->getAttr<CallbackAttr>()) { |
| 2499 | // Annotate the callback behavior as metadata: |
| 2500 | // - The callback callee (as argument number). |
| 2501 | // - The callback payloads (as argument numbers). |
| 2502 | llvm::LLVMContext &Ctx = F->getContext(); |
| 2503 | llvm::MDBuilder MDB(Ctx); |
| 2504 | |
| 2505 | // The payload indices are all but the first one in the encoding. The first |
| 2506 | // identifies the callback callee. |
| 2507 | int CalleeIdx = *CB->encoding_begin(); |
| 2508 | ArrayRef<int> PayloadIndices(CB->encoding_begin() + 1, CB->encoding_end()); |
| 2509 | F->addMetadata(llvm::LLVMContext::MD_callback, |
| 2510 | *llvm::MDNode::get(Ctx, {MDB.createCallbackEncoding( |
| 2511 | CalleeIdx, PayloadIndices, |
| 2512 | /* VarArgsArePassed */ false)})); |
| 2513 | } |
| 2514 | } |
| 2515 | |
| 2516 | void CodeGenModule::addUsedGlobal(llvm::GlobalValue *GV) { |
| 2517 | 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.\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 2518, __extension__ __PRETTY_FUNCTION__ )) |
| 2518 | "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.\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 2518, __extension__ __PRETTY_FUNCTION__ )); |
| 2519 | LLVMUsed.emplace_back(GV); |
| 2520 | } |
| 2521 | |
| 2522 | void CodeGenModule::addCompilerUsedGlobal(llvm::GlobalValue *GV) { |
| 2523 | 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.\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 2524, __extension__ __PRETTY_FUNCTION__ )) |
| 2524 | "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.\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 2524, __extension__ __PRETTY_FUNCTION__ )); |
| 2525 | LLVMCompilerUsed.emplace_back(GV); |
| 2526 | } |
| 2527 | |
| 2528 | void CodeGenModule::addUsedOrCompilerUsedGlobal(llvm::GlobalValue *GV) { |
| 2529 | 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.\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 2530, __extension__ __PRETTY_FUNCTION__ )) |
| 2530 | "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.\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 2530, __extension__ __PRETTY_FUNCTION__ )); |
| 2531 | if (getTriple().isOSBinFormatELF()) |
| 2532 | LLVMCompilerUsed.emplace_back(GV); |
| 2533 | else |
| 2534 | LLVMUsed.emplace_back(GV); |
| 2535 | } |
| 2536 | |
| 2537 | static void emitUsed(CodeGenModule &CGM, StringRef Name, |
| 2538 | std::vector<llvm::WeakTrackingVH> &List) { |
| 2539 | // Don't create llvm.used if there is no need. |
| 2540 | if (List.empty()) |
| 2541 | return; |
| 2542 | |
| 2543 | // Convert List to what ConstantArray needs. |
| 2544 | SmallVector<llvm::Constant*, 8> UsedArray; |
| 2545 | UsedArray.resize(List.size()); |
| 2546 | for (unsigned i = 0, e = List.size(); i != e; ++i) { |
| 2547 | UsedArray[i] = |
| 2548 | llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast( |
| 2549 | cast<llvm::Constant>(&*List[i]), CGM.Int8PtrTy); |
| 2550 | } |
| 2551 | |
| 2552 | if (UsedArray.empty()) |
| 2553 | return; |
| 2554 | llvm::ArrayType *ATy = llvm::ArrayType::get(CGM.Int8PtrTy, UsedArray.size()); |
| 2555 | |
| 2556 | auto *GV = new llvm::GlobalVariable( |
| 2557 | CGM.getModule(), ATy, false, llvm::GlobalValue::AppendingLinkage, |
| 2558 | llvm::ConstantArray::get(ATy, UsedArray), Name); |
| 2559 | |
| 2560 | GV->setSection("llvm.metadata"); |
| 2561 | } |
| 2562 | |
| 2563 | void CodeGenModule::emitLLVMUsed() { |
| 2564 | emitUsed(*this, "llvm.used", LLVMUsed); |
| 2565 | emitUsed(*this, "llvm.compiler.used", LLVMCompilerUsed); |
| 2566 | } |
| 2567 | |
| 2568 | void CodeGenModule::AppendLinkerOptions(StringRef Opts) { |
| 2569 | auto *MDOpts = llvm::MDString::get(getLLVMContext(), Opts); |
| 2570 | LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts)); |
| 2571 | } |
| 2572 | |
| 2573 | void CodeGenModule::AddDetectMismatch(StringRef Name, StringRef Value) { |
| 2574 | llvm::SmallString<32> Opt; |
| 2575 | getTargetCodeGenInfo().getDetectMismatchOption(Name, Value, Opt); |
| 2576 | if (Opt.empty()) |
| 2577 | return; |
| 2578 | auto *MDOpts = llvm::MDString::get(getLLVMContext(), Opt); |
| 2579 | LinkerOptionsMetadata.push_back(llvm::MDNode::get(getLLVMContext(), MDOpts)); |
| 2580 | } |
| 2581 | |
| 2582 | void CodeGenModule::AddDependentLib(StringRef Lib) { |
| 2583 | auto &C = getLLVMContext(); |
| 2584 | if (getTarget().getTriple().isOSBinFormatELF()) { |
| 2585 | ELFDependentLibraries.push_back( |
| 2586 | llvm::MDNode::get(C, llvm::MDString::get(C, Lib))); |
| 2587 | return; |
| 2588 | } |
| 2589 | |
| 2590 | llvm::SmallString<24> Opt; |
| 2591 | getTargetCodeGenInfo().getDependentLibraryOption(Lib, Opt); |
| 2592 | auto *MDOpts = llvm::MDString::get(getLLVMContext(), Opt); |
| 2593 | LinkerOptionsMetadata.push_back(llvm::MDNode::get(C, MDOpts)); |
| 2594 | } |
| 2595 | |
| 2596 | /// Add link options implied by the given module, including modules |
| 2597 | /// it depends on, using a postorder walk. |
| 2598 | static void addLinkOptionsPostorder(CodeGenModule &CGM, Module *Mod, |
| 2599 | SmallVectorImpl<llvm::MDNode *> &Metadata, |
| 2600 | llvm::SmallPtrSet<Module *, 16> &Visited) { |
| 2601 | // Import this module's parent. |
| 2602 | if (Mod->Parent && Visited.insert(Mod->Parent).second) { |
| 2603 | addLinkOptionsPostorder(CGM, Mod->Parent, Metadata, Visited); |
| 2604 | } |
| 2605 | |
| 2606 | // Import this module's dependencies. |
| 2607 | for (Module *Import : llvm::reverse(Mod->Imports)) { |
| 2608 | if (Visited.insert(Import).second) |
| 2609 | addLinkOptionsPostorder(CGM, Import, Metadata, Visited); |
| 2610 | } |
| 2611 | |
| 2612 | // Add linker options to link against the libraries/frameworks |
| 2613 | // described by this module. |
| 2614 | llvm::LLVMContext &Context = CGM.getLLVMContext(); |
| 2615 | bool IsELF = CGM.getTarget().getTriple().isOSBinFormatELF(); |
| 2616 | |
| 2617 | // For modules that use export_as for linking, use that module |
| 2618 | // name instead. |
| 2619 | if (Mod->UseExportAsModuleLinkName) |
| 2620 | return; |
| 2621 | |
| 2622 | for (const Module::LinkLibrary &LL : llvm::reverse(Mod->LinkLibraries)) { |
| 2623 | // Link against a framework. Frameworks are currently Darwin only, so we |
| 2624 | // don't to ask TargetCodeGenInfo for the spelling of the linker option. |
| 2625 | if (LL.IsFramework) { |
| 2626 | llvm::Metadata *Args[2] = {llvm::MDString::get(Context, "-framework"), |
| 2627 | llvm::MDString::get(Context, LL.Library)}; |
| 2628 | |
| 2629 | Metadata.push_back(llvm::MDNode::get(Context, Args)); |
| 2630 | continue; |
| 2631 | } |
| 2632 | |
| 2633 | // Link against a library. |
| 2634 | if (IsELF) { |
| 2635 | llvm::Metadata *Args[2] = { |
| 2636 | llvm::MDString::get(Context, "lib"), |
| 2637 | llvm::MDString::get(Context, LL.Library), |
| 2638 | }; |
| 2639 | Metadata.push_back(llvm::MDNode::get(Context, Args)); |
| 2640 | } else { |
| 2641 | llvm::SmallString<24> Opt; |
| 2642 | CGM.getTargetCodeGenInfo().getDependentLibraryOption(LL.Library, Opt); |
| 2643 | auto *OptString = llvm::MDString::get(Context, Opt); |
| 2644 | Metadata.push_back(llvm::MDNode::get(Context, OptString)); |
| 2645 | } |
| 2646 | } |
| 2647 | } |
| 2648 | |
| 2649 | void CodeGenModule::EmitModuleInitializers(clang::Module *Primary) { |
| 2650 | // Emit the initializers in the order that sub-modules appear in the |
| 2651 | // source, first Global Module Fragments, if present. |
| 2652 | if (auto GMF = Primary->getGlobalModuleFragment()) { |
| 2653 | for (Decl *D : getContext().getModuleInitializers(GMF)) { |
| 2654 | if (isa<ImportDecl>(D)) |
| 2655 | continue; |
| 2656 | assert(isa<VarDecl>(D) && "GMF initializer decl is not a var?")(static_cast <bool> (isa<VarDecl>(D) && "GMF initializer decl is not a var?" ) ? void (0) : __assert_fail ("isa<VarDecl>(D) && \"GMF initializer decl is not a var?\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 2656, __extension__ __PRETTY_FUNCTION__ )); |
| 2657 | EmitTopLevelDecl(D); |
| 2658 | } |
| 2659 | } |
| 2660 | // Second any associated with the module, itself. |
| 2661 | for (Decl *D : getContext().getModuleInitializers(Primary)) { |
| 2662 | // Skip import decls, the inits for those are called explicitly. |
| 2663 | if (isa<ImportDecl>(D)) |
| 2664 | continue; |
| 2665 | EmitTopLevelDecl(D); |
| 2666 | } |
| 2667 | // Third any associated with the Privat eMOdule Fragment, if present. |
| 2668 | if (auto PMF = Primary->getPrivateModuleFragment()) { |
| 2669 | for (Decl *D : getContext().getModuleInitializers(PMF)) { |
| 2670 | assert(isa<VarDecl>(D) && "PMF initializer decl is not a var?")(static_cast <bool> (isa<VarDecl>(D) && "PMF initializer decl is not a var?" ) ? void (0) : __assert_fail ("isa<VarDecl>(D) && \"PMF initializer decl is not a var?\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 2670, __extension__ __PRETTY_FUNCTION__ )); |
| 2671 | EmitTopLevelDecl(D); |
| 2672 | } |
| 2673 | } |
| 2674 | } |
| 2675 | |
| 2676 | void CodeGenModule::EmitModuleLinkOptions() { |
| 2677 | // Collect the set of all of the modules we want to visit to emit link |
| 2678 | // options, which is essentially the imported modules and all of their |
| 2679 | // non-explicit child modules. |
| 2680 | llvm::SetVector<clang::Module *> LinkModules; |
| 2681 | llvm::SmallPtrSet<clang::Module *, 16> Visited; |
| 2682 | SmallVector<clang::Module *, 16> Stack; |
| 2683 | |
| 2684 | // Seed the stack with imported modules. |
| 2685 | for (Module *M : ImportedModules) { |
| 2686 | // Do not add any link flags when an implementation TU of a module imports |
| 2687 | // a header of that same module. |
| 2688 | if (M->getTopLevelModuleName() == getLangOpts().CurrentModule && |
| 2689 | !getLangOpts().isCompilingModule()) |
| 2690 | continue; |
| 2691 | if (Visited.insert(M).second) |
| 2692 | Stack.push_back(M); |
| 2693 | } |
| 2694 | |
| 2695 | // Find all of the modules to import, making a little effort to prune |
| 2696 | // non-leaf modules. |
| 2697 | while (!Stack.empty()) { |
| 2698 | clang::Module *Mod = Stack.pop_back_val(); |
| 2699 | |
| 2700 | bool AnyChildren = false; |
| 2701 | |
| 2702 | // Visit the submodules of this module. |
| 2703 | for (const auto &SM : Mod->submodules()) { |
| 2704 | // Skip explicit children; they need to be explicitly imported to be |
| 2705 | // linked against. |
| 2706 | if (SM->IsExplicit) |
| 2707 | continue; |
| 2708 | |
| 2709 | if (Visited.insert(SM).second) { |
| 2710 | Stack.push_back(SM); |
| 2711 | AnyChildren = true; |
| 2712 | } |
| 2713 | } |
| 2714 | |
| 2715 | // We didn't find any children, so add this module to the list of |
| 2716 | // modules to link against. |
| 2717 | if (!AnyChildren) { |
| 2718 | LinkModules.insert(Mod); |
| 2719 | } |
| 2720 | } |
| 2721 | |
| 2722 | // Add link options for all of the imported modules in reverse topological |
| 2723 | // order. We don't do anything to try to order import link flags with respect |
| 2724 | // to linker options inserted by things like #pragma comment(). |
| 2725 | SmallVector<llvm::MDNode *, 16> MetadataArgs; |
| 2726 | Visited.clear(); |
| 2727 | for (Module *M : LinkModules) |
| 2728 | if (Visited.insert(M).second) |
| 2729 | addLinkOptionsPostorder(*this, M, MetadataArgs, Visited); |
| 2730 | std::reverse(MetadataArgs.begin(), MetadataArgs.end()); |
| 2731 | LinkerOptionsMetadata.append(MetadataArgs.begin(), MetadataArgs.end()); |
| 2732 | |
| 2733 | // Add the linker options metadata flag. |
| 2734 | auto *NMD = getModule().getOrInsertNamedMetadata("llvm.linker.options"); |
| 2735 | for (auto *MD : LinkerOptionsMetadata) |
| 2736 | NMD->addOperand(MD); |
| 2737 | } |
| 2738 | |
| 2739 | void CodeGenModule::EmitDeferred() { |
| 2740 | // Emit deferred declare target declarations. |
| 2741 | if (getLangOpts().OpenMP && !getLangOpts().OpenMPSimd) |
| 2742 | getOpenMPRuntime().emitDeferredTargetDecls(); |
| 2743 | |
| 2744 | // Emit code for any potentially referenced deferred decls. Since a |
| 2745 | // previously unused static decl may become used during the generation of code |
| 2746 | // for a static function, iterate until no changes are made. |
| 2747 | |
| 2748 | if (!DeferredVTables.empty()) { |
| 2749 | EmitDeferredVTables(); |
| 2750 | |
| 2751 | // Emitting a vtable doesn't directly cause more vtables to |
| 2752 | // become deferred, although it can cause functions to be |
| 2753 | // emitted that then need those vtables. |
| 2754 | assert(DeferredVTables.empty())(static_cast <bool> (DeferredVTables.empty()) ? void (0 ) : __assert_fail ("DeferredVTables.empty()", "clang/lib/CodeGen/CodeGenModule.cpp" , 2754, __extension__ __PRETTY_FUNCTION__)); |
| 2755 | } |
| 2756 | |
| 2757 | // Emit CUDA/HIP static device variables referenced by host code only. |
| 2758 | // Note we should not clear CUDADeviceVarODRUsedByHost since it is still |
| 2759 | // needed for further handling. |
| 2760 | if (getLangOpts().CUDA && getLangOpts().CUDAIsDevice) |
| 2761 | llvm::append_range(DeferredDeclsToEmit, |
| 2762 | getContext().CUDADeviceVarODRUsedByHost); |
| 2763 | |
| 2764 | // Stop if we're out of both deferred vtables and deferred declarations. |
| 2765 | if (DeferredDeclsToEmit.empty()) |
| 2766 | return; |
| 2767 | |
| 2768 | // Grab the list of decls to emit. If EmitGlobalDefinition schedules more |
| 2769 | // work, it will not interfere with this. |
| 2770 | std::vector<GlobalDecl> CurDeclsToEmit; |
| 2771 | CurDeclsToEmit.swap(DeferredDeclsToEmit); |
| 2772 | |
| 2773 | for (GlobalDecl &D : CurDeclsToEmit) { |
| 2774 | // We should call GetAddrOfGlobal with IsForDefinition set to true in order |
| 2775 | // to get GlobalValue with exactly the type we need, not something that |
| 2776 | // might had been created for another decl with the same mangled name but |
| 2777 | // different type. |
| 2778 | llvm::GlobalValue *GV = dyn_cast<llvm::GlobalValue>( |
| 2779 | GetAddrOfGlobal(D, ForDefinition)); |
| 2780 | |
| 2781 | // In case of different address spaces, we may still get a cast, even with |
| 2782 | // IsForDefinition equal to true. Query mangled names table to get |
| 2783 | // GlobalValue. |
| 2784 | if (!GV) |
| 2785 | GV = GetGlobalValue(getMangledName(D)); |
| 2786 | |
| 2787 | // Make sure GetGlobalValue returned non-null. |
| 2788 | assert(GV)(static_cast <bool> (GV) ? void (0) : __assert_fail ("GV" , "clang/lib/CodeGen/CodeGenModule.cpp", 2788, __extension__ __PRETTY_FUNCTION__ )); |
| 2789 | |
| 2790 | // Check to see if we've already emitted this. This is necessary |
| 2791 | // for a couple of reasons: first, decls can end up in the |
| 2792 | // deferred-decls queue multiple times, and second, decls can end |
| 2793 | // up with definitions in unusual ways (e.g. by an extern inline |
| 2794 | // function acquiring a strong function redefinition). Just |
| 2795 | // ignore these cases. |
| 2796 | if (!GV->isDeclaration()) |
| 2797 | continue; |
| 2798 | |
| 2799 | // If this is OpenMP, check if it is legal to emit this global normally. |
| 2800 | if (LangOpts.OpenMP && OpenMPRuntime && OpenMPRuntime->emitTargetGlobal(D)) |
| 2801 | continue; |
| 2802 | |
| 2803 | // Otherwise, emit the definition and move on to the next one. |
| 2804 | EmitGlobalDefinition(D, GV); |
| 2805 | |
| 2806 | // If we found out that we need to emit more decls, do that recursively. |
| 2807 | // This has the advantage that the decls are emitted in a DFS and related |
| 2808 | // ones are close together, which is convenient for testing. |
| 2809 | if (!DeferredVTables.empty() || !DeferredDeclsToEmit.empty()) { |
| 2810 | EmitDeferred(); |
| 2811 | assert(DeferredVTables.empty() && DeferredDeclsToEmit.empty())(static_cast <bool> (DeferredVTables.empty() && DeferredDeclsToEmit.empty()) ? void (0) : __assert_fail ("DeferredVTables.empty() && DeferredDeclsToEmit.empty()" , "clang/lib/CodeGen/CodeGenModule.cpp", 2811, __extension__ __PRETTY_FUNCTION__ )); |
| 2812 | } |
| 2813 | } |
| 2814 | } |
| 2815 | |
| 2816 | void CodeGenModule::EmitVTablesOpportunistically() { |
| 2817 | // Try to emit external vtables as available_externally if they have emitted |
| 2818 | // all inlined virtual functions. It runs after EmitDeferred() and therefore |
| 2819 | // is not allowed to create new references to things that need to be emitted |
| 2820 | // lazily. Note that it also uses fact that we eagerly emitting RTTI. |
| 2821 | |
| 2822 | 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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 2823, __extension__ __PRETTY_FUNCTION__ )) |
| 2823 | && "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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 2823, __extension__ __PRETTY_FUNCTION__ )); |
| 2824 | |
| 2825 | for (const CXXRecordDecl *RD : OpportunisticVTables) { |
| 2826 | 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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 2827, __extension__ __PRETTY_FUNCTION__ )) |
| 2827 | "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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 2827, __extension__ __PRETTY_FUNCTION__ )); |
| 2828 | if (getCXXABI().canSpeculativelyEmitVTable(RD)) |
| 2829 | VTables.GenerateClassData(RD); |
| 2830 | } |
| 2831 | OpportunisticVTables.clear(); |
| 2832 | } |
| 2833 | |
| 2834 | void CodeGenModule::EmitGlobalAnnotations() { |
| 2835 | if (Annotations.empty()) |
| 2836 | return; |
| 2837 | |
| 2838 | // Create a new global variable for the ConstantStruct in the Module. |
| 2839 | llvm::Constant *Array = llvm::ConstantArray::get(llvm::ArrayType::get( |
| 2840 | Annotations[0]->getType(), Annotations.size()), Annotations); |
| 2841 | auto *gv = new llvm::GlobalVariable(getModule(), Array->getType(), false, |
| 2842 | llvm::GlobalValue::AppendingLinkage, |
| 2843 | Array, "llvm.global.annotations"); |
| 2844 | gv->setSection(AnnotationSection); |
| 2845 | } |
| 2846 | |
| 2847 | llvm::Constant *CodeGenModule::EmitAnnotationString(StringRef Str) { |
| 2848 | llvm::Constant *&AStr = AnnotationStrings[Str]; |
| 2849 | if (AStr) |
| 2850 | return AStr; |
| 2851 | |
| 2852 | // Not found yet, create a new global. |
| 2853 | llvm::Constant *s = llvm::ConstantDataArray::getString(getLLVMContext(), Str); |
| 2854 | auto *gv = new llvm::GlobalVariable( |
| 2855 | getModule(), s->getType(), true, llvm::GlobalValue::PrivateLinkage, s, |
| 2856 | ".str", nullptr, llvm::GlobalValue::NotThreadLocal, |
| 2857 | ConstGlobalsPtrTy->getAddressSpace()); |
| 2858 | gv->setSection(AnnotationSection); |
| 2859 | gv->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global); |
| 2860 | AStr = gv; |
| 2861 | return gv; |
| 2862 | } |
| 2863 | |
| 2864 | llvm::Constant *CodeGenModule::EmitAnnotationUnit(SourceLocation Loc) { |
| 2865 | SourceManager &SM = getContext().getSourceManager(); |
| 2866 | PresumedLoc PLoc = SM.getPresumedLoc(Loc); |
| 2867 | if (PLoc.isValid()) |
| 2868 | return EmitAnnotationString(PLoc.getFilename()); |
| 2869 | return EmitAnnotationString(SM.getBufferName(Loc)); |
| 2870 | } |
| 2871 | |
| 2872 | llvm::Constant *CodeGenModule::EmitAnnotationLineNo(SourceLocation L) { |
| 2873 | SourceManager &SM = getContext().getSourceManager(); |
| 2874 | PresumedLoc PLoc = SM.getPresumedLoc(L); |
| 2875 | unsigned LineNo = PLoc.isValid() ? PLoc.getLine() : |
| 2876 | SM.getExpansionLineNumber(L); |
| 2877 | return llvm::ConstantInt::get(Int32Ty, LineNo); |
| 2878 | } |
| 2879 | |
| 2880 | llvm::Constant *CodeGenModule::EmitAnnotationArgs(const AnnotateAttr *Attr) { |
| 2881 | ArrayRef<Expr *> Exprs = {Attr->args_begin(), Attr->args_size()}; |
| 2882 | if (Exprs.empty()) |
| 2883 | return llvm::ConstantPointerNull::get(ConstGlobalsPtrTy); |
| 2884 | |
| 2885 | llvm::FoldingSetNodeID ID; |
| 2886 | for (Expr *E : Exprs) { |
| 2887 | ID.Add(cast<clang::ConstantExpr>(E)->getAPValueResult()); |
| 2888 | } |
| 2889 | llvm::Constant *&Lookup = AnnotationArgs[ID.ComputeHash()]; |
| 2890 | if (Lookup) |
| 2891 | return Lookup; |
| 2892 | |
| 2893 | llvm::SmallVector<llvm::Constant *, 4> LLVMArgs; |
| 2894 | LLVMArgs.reserve(Exprs.size()); |
| 2895 | ConstantEmitter ConstEmiter(*this); |
| 2896 | llvm::transform(Exprs, std::back_inserter(LLVMArgs), [&](const Expr *E) { |
| 2897 | const auto *CE = cast<clang::ConstantExpr>(E); |
| 2898 | return ConstEmiter.emitAbstract(CE->getBeginLoc(), CE->getAPValueResult(), |
| 2899 | CE->getType()); |
| 2900 | }); |
| 2901 | auto *Struct = llvm::ConstantStruct::getAnon(LLVMArgs); |
| 2902 | auto *GV = new llvm::GlobalVariable(getModule(), Struct->getType(), true, |
| 2903 | llvm::GlobalValue::PrivateLinkage, Struct, |
| 2904 | ".args"); |
| 2905 | GV->setSection(AnnotationSection); |
| 2906 | GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global); |
| 2907 | auto *Bitcasted = llvm::ConstantExpr::getBitCast(GV, GlobalsInt8PtrTy); |
| 2908 | |
| 2909 | Lookup = Bitcasted; |
| 2910 | return Bitcasted; |
| 2911 | } |
| 2912 | |
| 2913 | llvm::Constant *CodeGenModule::EmitAnnotateAttr(llvm::GlobalValue *GV, |
| 2914 | const AnnotateAttr *AA, |
| 2915 | SourceLocation L) { |
| 2916 | // Get the globals for file name, annotation, and the line number. |
| 2917 | llvm::Constant *AnnoGV = EmitAnnotationString(AA->getAnnotation()), |
| 2918 | *UnitGV = EmitAnnotationUnit(L), |
| 2919 | *LineNoCst = EmitAnnotationLineNo(L), |
| 2920 | *Args = EmitAnnotationArgs(AA); |
| 2921 | |
| 2922 | llvm::Constant *GVInGlobalsAS = GV; |
| 2923 | if (GV->getAddressSpace() != |
| 2924 | getDataLayout().getDefaultGlobalsAddressSpace()) { |
| 2925 | GVInGlobalsAS = llvm::ConstantExpr::getAddrSpaceCast( |
| 2926 | GV, GV->getValueType()->getPointerTo( |
| 2927 | getDataLayout().getDefaultGlobalsAddressSpace())); |
| 2928 | } |
| 2929 | |
| 2930 | // Create the ConstantStruct for the global annotation. |
| 2931 | llvm::Constant *Fields[] = { |
| 2932 | llvm::ConstantExpr::getBitCast(GVInGlobalsAS, GlobalsInt8PtrTy), |
| 2933 | llvm::ConstantExpr::getBitCast(AnnoGV, ConstGlobalsPtrTy), |
| 2934 | llvm::ConstantExpr::getBitCast(UnitGV, ConstGlobalsPtrTy), |
| 2935 | LineNoCst, |
| 2936 | Args, |
| 2937 | }; |
| 2938 | return llvm::ConstantStruct::getAnon(Fields); |
| 2939 | } |
| 2940 | |
| 2941 | void CodeGenModule::AddGlobalAnnotations(const ValueDecl *D, |
| 2942 | llvm::GlobalValue *GV) { |
| 2943 | 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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 2943, __extension__ __PRETTY_FUNCTION__ )); |
| 2944 | // Get the struct elements for these annotations. |
| 2945 | for (const auto *I : D->specific_attrs<AnnotateAttr>()) |
| 2946 | Annotations.push_back(EmitAnnotateAttr(GV, I, D->getLocation())); |
| 2947 | } |
| 2948 | |
| 2949 | bool CodeGenModule::isInNoSanitizeList(SanitizerMask Kind, llvm::Function *Fn, |
| 2950 | SourceLocation Loc) const { |
| 2951 | const auto &NoSanitizeL = getContext().getNoSanitizeList(); |
| 2952 | // NoSanitize by function name. |
| 2953 | if (NoSanitizeL.containsFunction(Kind, Fn->getName())) |
| 2954 | return true; |
| 2955 | // NoSanitize by location. Check "mainfile" prefix. |
| 2956 | auto &SM = Context.getSourceManager(); |
| 2957 | const FileEntry &MainFile = *SM.getFileEntryForID(SM.getMainFileID()); |
| 2958 | if (NoSanitizeL.containsMainFile(Kind, MainFile.getName())) |
| 2959 | return true; |
| 2960 | |
| 2961 | // Check "src" prefix. |
| 2962 | if (Loc.isValid()) |
| 2963 | return NoSanitizeL.containsLocation(Kind, Loc); |
| 2964 | // If location is unknown, this may be a compiler-generated function. Assume |
| 2965 | // it's located in the main file. |
| 2966 | return NoSanitizeL.containsFile(Kind, MainFile.getName()); |
| 2967 | } |
| 2968 | |
| 2969 | bool CodeGenModule::isInNoSanitizeList(SanitizerMask Kind, |
| 2970 | llvm::GlobalVariable *GV, |
| 2971 | SourceLocation Loc, QualType Ty, |
| 2972 | StringRef Category) const { |
| 2973 | const auto &NoSanitizeL = getContext().getNoSanitizeList(); |
| 2974 | if (NoSanitizeL.containsGlobal(Kind, GV->getName(), Category)) |
| 2975 | return true; |
| 2976 | auto &SM = Context.getSourceManager(); |
| 2977 | if (NoSanitizeL.containsMainFile( |
| 2978 | Kind, SM.getFileEntryForID(SM.getMainFileID())->getName(), Category)) |
| 2979 | return true; |
| 2980 | if (NoSanitizeL.containsLocation(Kind, Loc, Category)) |
| 2981 | return true; |
| 2982 | |
| 2983 | // Check global type. |
| 2984 | if (!Ty.isNull()) { |
| 2985 | // Drill down the array types: if global variable of a fixed type is |
| 2986 | // not sanitized, we also don't instrument arrays of them. |
| 2987 | while (auto AT = dyn_cast<ArrayType>(Ty.getTypePtr())) |
| 2988 | Ty = AT->getElementType(); |
| 2989 | Ty = Ty.getCanonicalType().getUnqualifiedType(); |
| 2990 | // Only record types (classes, structs etc.) are ignored. |
| 2991 | if (Ty->isRecordType()) { |
| 2992 | std::string TypeStr = Ty.getAsString(getContext().getPrintingPolicy()); |
| 2993 | if (NoSanitizeL.containsType(Kind, TypeStr, Category)) |
| 2994 | return true; |
| 2995 | } |
| 2996 | } |
| 2997 | return false; |
| 2998 | } |
| 2999 | |
| 3000 | bool CodeGenModule::imbueXRayAttrs(llvm::Function *Fn, SourceLocation Loc, |
| 3001 | StringRef Category) const { |
| 3002 | const auto &XRayFilter = getContext().getXRayFilter(); |
| 3003 | using ImbueAttr = XRayFunctionFilter::ImbueAttribute; |
| 3004 | auto Attr = ImbueAttr::NONE; |
| 3005 | if (Loc.isValid()) |
| 3006 | Attr = XRayFilter.shouldImbueLocation(Loc, Category); |
| 3007 | if (Attr == ImbueAttr::NONE) |
| 3008 | Attr = XRayFilter.shouldImbueFunction(Fn->getName()); |
| 3009 | switch (Attr) { |
| 3010 | case ImbueAttr::NONE: |
| 3011 | return false; |
| 3012 | case ImbueAttr::ALWAYS: |
| 3013 | Fn->addFnAttr("function-instrument", "xray-always"); |
| 3014 | break; |
| 3015 | case ImbueAttr::ALWAYS_ARG1: |
| 3016 | Fn->addFnAttr("function-instrument", "xray-always"); |
| 3017 | Fn->addFnAttr("xray-log-args", "1"); |
| 3018 | break; |
| 3019 | case ImbueAttr::NEVER: |
| 3020 | Fn->addFnAttr("function-instrument", "xray-never"); |
| 3021 | break; |
| 3022 | } |
| 3023 | return true; |
| 3024 | } |
| 3025 | |
| 3026 | ProfileList::ExclusionType |
| 3027 | CodeGenModule::isFunctionBlockedByProfileList(llvm::Function *Fn, |
| 3028 | SourceLocation Loc) const { |
| 3029 | const auto &ProfileList = getContext().getProfileList(); |
| 3030 | // If the profile list is empty, then instrument everything. |
| 3031 | if (ProfileList.isEmpty()) |
| 3032 | return ProfileList::Allow; |
| 3033 | CodeGenOptions::ProfileInstrKind Kind = getCodeGenOpts().getProfileInstr(); |
| 3034 | // First, check the function name. |
| 3035 | if (auto V = ProfileList.isFunctionExcluded(Fn->getName(), Kind)) |
| 3036 | return *V; |
| 3037 | // Next, check the source location. |
| 3038 | if (Loc.isValid()) |
| 3039 | if (auto V = ProfileList.isLocationExcluded(Loc, Kind)) |
| 3040 | return *V; |
| 3041 | // If location is unknown, this may be a compiler-generated function. Assume |
| 3042 | // it's located in the main file. |
| 3043 | auto &SM = Context.getSourceManager(); |
| 3044 | if (const auto *MainFile = SM.getFileEntryForID(SM.getMainFileID())) |
| 3045 | if (auto V = ProfileList.isFileExcluded(MainFile->getName(), Kind)) |
| 3046 | return *V; |
| 3047 | return ProfileList.getDefault(Kind); |
| 3048 | } |
| 3049 | |
| 3050 | ProfileList::ExclusionType |
| 3051 | CodeGenModule::isFunctionBlockedFromProfileInstr(llvm::Function *Fn, |
| 3052 | SourceLocation Loc) const { |
| 3053 | auto V = isFunctionBlockedByProfileList(Fn, Loc); |
| 3054 | if (V != ProfileList::Allow) |
| 3055 | return V; |
| 3056 | |
| 3057 | auto NumGroups = getCodeGenOpts().ProfileTotalFunctionGroups; |
| 3058 | if (NumGroups > 1) { |
| 3059 | auto Group = llvm::crc32(arrayRefFromStringRef(Fn->getName())) % NumGroups; |
| 3060 | if (Group != getCodeGenOpts().ProfileSelectedFunctionGroup) |
| 3061 | return ProfileList::Skip; |
| 3062 | } |
| 3063 | return ProfileList::Allow; |
| 3064 | } |
| 3065 | |
| 3066 | bool CodeGenModule::MustBeEmitted(const ValueDecl *Global) { |
| 3067 | // Never defer when EmitAllDecls is specified. |
| 3068 | if (LangOpts.EmitAllDecls) |
| 3069 | return true; |
| 3070 | |
| 3071 | if (CodeGenOpts.KeepStaticConsts) { |
| 3072 | const auto *VD = dyn_cast<VarDecl>(Global); |
| 3073 | if (VD && VD->getType().isConstQualified() && |
| 3074 | VD->getStorageDuration() == SD_Static) |
| 3075 | return true; |
| 3076 | } |
| 3077 | |
| 3078 | return getContext().DeclMustBeEmitted(Global); |
| 3079 | } |
| 3080 | |
| 3081 | bool CodeGenModule::MayBeEmittedEagerly(const ValueDecl *Global) { |
| 3082 | // In OpenMP 5.0 variables and function may be marked as |
| 3083 | // device_type(host/nohost) and we should not emit them eagerly unless we sure |
| 3084 | // that they must be emitted on the host/device. To be sure we need to have |
| 3085 | // seen a declare target with an explicit mentioning of the function, we know |
| 3086 | // we have if the level of the declare target attribute is -1. Note that we |
| 3087 | // check somewhere else if we should emit this at all. |
| 3088 | if (LangOpts.OpenMP >= 50 && !LangOpts.OpenMPSimd) { |
| 3089 | std::optional<OMPDeclareTargetDeclAttr *> ActiveAttr = |
| 3090 | OMPDeclareTargetDeclAttr::getActiveAttr(Global); |
| 3091 | if (!ActiveAttr || (*ActiveAttr)->getLevel() != (unsigned)-1) |
| 3092 | return false; |
| 3093 | } |
| 3094 | |
| 3095 | if (const auto *FD = dyn_cast<FunctionDecl>(Global)) { |
| 3096 | if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) |
| 3097 | // Implicit template instantiations may change linkage if they are later |
| 3098 | // explicitly instantiated, so they should not be emitted eagerly. |
| 3099 | return false; |
| 3100 | } |
| 3101 | if (const auto *VD = dyn_cast<VarDecl>(Global)) { |
| 3102 | if (Context.getInlineVariableDefinitionKind(VD) == |
| 3103 | ASTContext::InlineVariableDefinitionKind::WeakUnknown) |
| 3104 | // A definition of an inline constexpr static data member may change |
| 3105 | // linkage later if it's redeclared outside the class. |
| 3106 | return false; |
| 3107 | if (CXX20ModuleInits && VD->getOwningModule() && |
| 3108 | !VD->getOwningModule()->isModuleMapModule()) { |
| 3109 | // For CXX20, module-owned initializers need to be deferred, since it is |
| 3110 | // not known at this point if they will be run for the current module or |
| 3111 | // as part of the initializer for an imported one. |
| 3112 | return false; |
| 3113 | } |
| 3114 | } |
| 3115 | // If OpenMP is enabled and threadprivates must be generated like TLS, delay |
| 3116 | // codegen for global variables, because they may be marked as threadprivate. |
| 3117 | if (LangOpts.OpenMP && LangOpts.OpenMPUseTLS && |
| 3118 | getContext().getTargetInfo().isTLSSupported() && isa<VarDecl>(Global) && |
| 3119 | !isTypeConstant(Global->getType(), false) && |
| 3120 | !OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(Global)) |
| 3121 | return false; |
| 3122 | |
| 3123 | return true; |
| 3124 | } |
| 3125 | |
| 3126 | ConstantAddress CodeGenModule::GetAddrOfMSGuidDecl(const MSGuidDecl *GD) { |
| 3127 | StringRef Name = getMangledName(GD); |
| 3128 | |
| 3129 | // The UUID descriptor should be pointer aligned. |
| 3130 | CharUnits Alignment = CharUnits::fromQuantity(PointerAlignInBytes); |
| 3131 | |
| 3132 | // Look for an existing global. |
| 3133 | if (llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name)) |
| 3134 | return ConstantAddress(GV, GV->getValueType(), Alignment); |
| 3135 | |
| 3136 | ConstantEmitter Emitter(*this); |
| 3137 | llvm::Constant *Init; |
| 3138 | |
| 3139 | APValue &V = GD->getAsAPValue(); |
| 3140 | if (!V.isAbsent()) { |
| 3141 | // If possible, emit the APValue version of the initializer. In particular, |
| 3142 | // this gets the type of the constant right. |
| 3143 | Init = Emitter.emitForInitializer( |
| 3144 | GD->getAsAPValue(), GD->getType().getAddressSpace(), GD->getType()); |
| 3145 | } else { |
| 3146 | // As a fallback, directly construct the constant. |
| 3147 | // FIXME: This may get padding wrong under esoteric struct layout rules. |
| 3148 | // MSVC appears to create a complete type 'struct __s_GUID' that it |
| 3149 | // presumably uses to represent these constants. |
| 3150 | MSGuidDecl::Parts Parts = GD->getParts(); |
| 3151 | llvm::Constant *Fields[4] = { |
| 3152 | llvm::ConstantInt::get(Int32Ty, Parts.Part1), |
| 3153 | llvm::ConstantInt::get(Int16Ty, Parts.Part2), |
| 3154 | llvm::ConstantInt::get(Int16Ty, Parts.Part3), |
| 3155 | llvm::ConstantDataArray::getRaw( |
| 3156 | StringRef(reinterpret_cast<char *>(Parts.Part4And5), 8), 8, |
| 3157 | Int8Ty)}; |
| 3158 | Init = llvm::ConstantStruct::getAnon(Fields); |
| 3159 | } |
| 3160 | |
| 3161 | auto *GV = new llvm::GlobalVariable( |
| 3162 | getModule(), Init->getType(), |
| 3163 | /*isConstant=*/true, llvm::GlobalValue::LinkOnceODRLinkage, Init, Name); |
| 3164 | if (supportsCOMDAT()) |
| 3165 | GV->setComdat(TheModule.getOrInsertComdat(GV->getName())); |
| 3166 | setDSOLocal(GV); |
| 3167 | |
| 3168 | if (!V.isAbsent()) { |
| 3169 | Emitter.finalize(GV); |
| 3170 | return ConstantAddress(GV, GV->getValueType(), Alignment); |
| 3171 | } |
| 3172 | |
| 3173 | llvm::Type *Ty = getTypes().ConvertTypeForMem(GD->getType()); |
| 3174 | llvm::Constant *Addr = llvm::ConstantExpr::getBitCast( |
| 3175 | GV, Ty->getPointerTo(GV->getAddressSpace())); |
| 3176 | return ConstantAddress(Addr, Ty, Alignment); |
| 3177 | } |
| 3178 | |
| 3179 | ConstantAddress CodeGenModule::GetAddrOfUnnamedGlobalConstantDecl( |
| 3180 | const UnnamedGlobalConstantDecl *GCD) { |
| 3181 | CharUnits Alignment = getContext().getTypeAlignInChars(GCD->getType()); |
| 3182 | |
| 3183 | llvm::GlobalVariable **Entry = nullptr; |
| 3184 | Entry = &UnnamedGlobalConstantDeclMap[GCD]; |
| 3185 | if (*Entry) |
| 3186 | return ConstantAddress(*Entry, (*Entry)->getValueType(), Alignment); |
| 3187 | |
| 3188 | ConstantEmitter Emitter(*this); |
| 3189 | llvm::Constant *Init; |
| 3190 | |
| 3191 | const APValue &V = GCD->getValue(); |
| 3192 | |
| 3193 | assert(!V.isAbsent())(static_cast <bool> (!V.isAbsent()) ? void (0) : __assert_fail ("!V.isAbsent()", "clang/lib/CodeGen/CodeGenModule.cpp", 3193 , __extension__ __PRETTY_FUNCTION__)); |
| 3194 | Init = Emitter.emitForInitializer(V, GCD->getType().getAddressSpace(), |
| 3195 | GCD->getType()); |
| 3196 | |
| 3197 | auto *GV = new llvm::GlobalVariable(getModule(), Init->getType(), |
| 3198 | /*isConstant=*/true, |
| 3199 | llvm::GlobalValue::PrivateLinkage, Init, |
| 3200 | ".constant"); |
| 3201 | GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global); |
| 3202 | GV->setAlignment(Alignment.getAsAlign()); |
| 3203 | |
| 3204 | Emitter.finalize(GV); |
| 3205 | |
| 3206 | *Entry = GV; |
| 3207 | return ConstantAddress(GV, GV->getValueType(), Alignment); |
| 3208 | } |
| 3209 | |
| 3210 | ConstantAddress CodeGenModule::GetAddrOfTemplateParamObject( |
| 3211 | const TemplateParamObjectDecl *TPO) { |
| 3212 | StringRef Name = getMangledName(TPO); |
| 3213 | CharUnits Alignment = getNaturalTypeAlignment(TPO->getType()); |
| 3214 | |
| 3215 | if (llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name)) |
| 3216 | return ConstantAddress(GV, GV->getValueType(), Alignment); |
| 3217 | |
| 3218 | ConstantEmitter Emitter(*this); |
| 3219 | llvm::Constant *Init = Emitter.emitForInitializer( |
| 3220 | TPO->getValue(), TPO->getType().getAddressSpace(), TPO->getType()); |
| 3221 | |
| 3222 | if (!Init) { |
| 3223 | ErrorUnsupported(TPO, "template parameter object"); |
| 3224 | return ConstantAddress::invalid(); |
| 3225 | } |
| 3226 | |
| 3227 | auto *GV = new llvm::GlobalVariable( |
| 3228 | getModule(), Init->getType(), |
| 3229 | /*isConstant=*/true, llvm::GlobalValue::LinkOnceODRLinkage, Init, Name); |
| 3230 | if (supportsCOMDAT()) |
| 3231 | GV->setComdat(TheModule.getOrInsertComdat(GV->getName())); |
| 3232 | Emitter.finalize(GV); |
| 3233 | |
| 3234 | return ConstantAddress(GV, GV->getValueType(), Alignment); |
| 3235 | } |
| 3236 | |
| 3237 | ConstantAddress CodeGenModule::GetWeakRefReference(const ValueDecl *VD) { |
| 3238 | const AliasAttr *AA = VD->getAttr<AliasAttr>(); |
| 3239 | assert(AA && "No alias?")(static_cast <bool> (AA && "No alias?") ? void ( 0) : __assert_fail ("AA && \"No alias?\"", "clang/lib/CodeGen/CodeGenModule.cpp" , 3239, __extension__ __PRETTY_FUNCTION__)); |
| 3240 | |
| 3241 | CharUnits Alignment = getContext().getDeclAlign(VD); |
| 3242 | llvm::Type *DeclTy = getTypes().ConvertTypeForMem(VD->getType()); |
| 3243 | |
| 3244 | // See if there is already something with the target's name in the module. |
| 3245 | llvm::GlobalValue *Entry = GetGlobalValue(AA->getAliasee()); |
| 3246 | if (Entry) { |
| 3247 | unsigned AS = getTypes().getTargetAddressSpace(VD->getType()); |
| 3248 | auto Ptr = llvm::ConstantExpr::getBitCast(Entry, DeclTy->getPointerTo(AS)); |
| 3249 | return ConstantAddress(Ptr, DeclTy, Alignment); |
| 3250 | } |
| 3251 | |
| 3252 | llvm::Constant *Aliasee; |
| 3253 | if (isa<llvm::FunctionType>(DeclTy)) |
| 3254 | Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy, |
| 3255 | GlobalDecl(cast<FunctionDecl>(VD)), |
| 3256 | /*ForVTable=*/false); |
| 3257 | else |
| 3258 | Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(), DeclTy, LangAS::Default, |
| 3259 | nullptr); |
| 3260 | |
| 3261 | auto *F = cast<llvm::GlobalValue>(Aliasee); |
| 3262 | F->setLinkage(llvm::Function::ExternalWeakLinkage); |
| 3263 | WeakRefReferences.insert(F); |
| 3264 | |
| 3265 | return ConstantAddress(Aliasee, DeclTy, Alignment); |
| 3266 | } |
| 3267 | |
| 3268 | void CodeGenModule::EmitGlobal(GlobalDecl GD) { |
| 3269 | const auto *Global = cast<ValueDecl>(GD.getDecl()); |
| 3270 | |
| 3271 | // Weak references don't produce any output by themselves. |
| 3272 | if (Global->hasAttr<WeakRefAttr>()) |
| 3273 | return; |
| 3274 | |
| 3275 | // If this is an alias definition (which otherwise looks like a declaration) |
| 3276 | // emit it now. |
| 3277 | if (Global->hasAttr<AliasAttr>()) |
| 3278 | return EmitAliasDefinition(GD); |
| 3279 | |
| 3280 | // IFunc like an alias whose value is resolved at runtime by calling resolver. |
| 3281 | if (Global->hasAttr<IFuncAttr>()) |
| 3282 | return emitIFuncDefinition(GD); |
| 3283 | |
| 3284 | // If this is a cpu_dispatch multiversion function, emit the resolver. |
| 3285 | if (Global->hasAttr<CPUDispatchAttr>()) |
| 3286 | return emitCPUDispatchDefinition(GD); |
| 3287 | |
| 3288 | // If this is CUDA, be selective about which declarations we emit. |
| 3289 | if (LangOpts.CUDA) { |
| 3290 | if (LangOpts.CUDAIsDevice) { |
| 3291 | if (!Global->hasAttr<CUDADeviceAttr>() && |
| 3292 | !Global->hasAttr<CUDAGlobalAttr>() && |
| 3293 | !Global->hasAttr<CUDAConstantAttr>() && |
| 3294 | !Global->hasAttr<CUDASharedAttr>() && |
| 3295 | !Global->getType()->isCUDADeviceBuiltinSurfaceType() && |
| 3296 | !Global->getType()->isCUDADeviceBuiltinTextureType()) |
| 3297 | return; |
| 3298 | } else { |
| 3299 | // We need to emit host-side 'shadows' for all global |
| 3300 | // device-side variables because the CUDA runtime needs their |
| 3301 | // size and host-side address in order to provide access to |
| 3302 | // their device-side incarnations. |
| 3303 | |
| 3304 | // So device-only functions are the only things we skip. |
| 3305 | if (isa<FunctionDecl>(Global) && !Global->hasAttr<CUDAHostAttr>() && |
| 3306 | Global->hasAttr<CUDADeviceAttr>()) |
| 3307 | return; |
| 3308 | |
| 3309 | 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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 3310, __extension__ __PRETTY_FUNCTION__ )) |
| 3310 | "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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 3310, __extension__ __PRETTY_FUNCTION__ )); |
| 3311 | } |
| 3312 | } |
| 3313 | |
| 3314 | if (LangOpts.OpenMP) { |
| 3315 | // If this is OpenMP, check if it is legal to emit this global normally. |
| 3316 | if (OpenMPRuntime && OpenMPRuntime->emitTargetGlobal(GD)) |
| 3317 | return; |
| 3318 | if (auto *DRD = dyn_cast<OMPDeclareReductionDecl>(Global)) { |
| 3319 | if (MustBeEmitted(Global)) |
| 3320 | EmitOMPDeclareReduction(DRD); |
| 3321 | return; |
| 3322 | } |
| 3323 | if (auto *DMD = dyn_cast<OMPDeclareMapperDecl>(Global)) { |
| 3324 | if (MustBeEmitted(Global)) |
| 3325 | EmitOMPDeclareMapper(DMD); |
| 3326 | return; |
| 3327 | } |
| 3328 | } |
| 3329 | |
| 3330 | // Ignore declarations, they will be emitted on their first use. |
| 3331 | if (const auto *FD = dyn_cast<FunctionDecl>(Global)) { |
| 3332 | // Forward declarations are emitted lazily on first use. |
| 3333 | if (!FD->doesThisDeclarationHaveABody()) { |
| 3334 | if (!FD->doesDeclarationForceExternallyVisibleDefinition()) |
| 3335 | return; |
| 3336 | |
| 3337 | StringRef MangledName = getMangledName(GD); |
| 3338 | |
| 3339 | // Compute the function info and LLVM type. |
| 3340 | const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD); |
| 3341 | llvm::Type *Ty = getTypes().GetFunctionType(FI); |
| 3342 | |
| 3343 | GetOrCreateLLVMFunction(MangledName, Ty, GD, /*ForVTable=*/false, |
| 3344 | /*DontDefer=*/false); |
| 3345 | return; |
| 3346 | } |
| 3347 | } else { |
| 3348 | const auto *VD = cast<VarDecl>(Global); |
| 3349 | 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.\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 3349, __extension__ __PRETTY_FUNCTION__ )); |
| 3350 | if (VD->isThisDeclarationADefinition() != VarDecl::Definition && |
| 3351 | !Context.isMSStaticDataMemberInlineDefinition(VD)) { |
| 3352 | if (LangOpts.OpenMP) { |
| 3353 | // Emit declaration of the must-be-emitted declare target variable. |
| 3354 | if (std::optional<OMPDeclareTargetDeclAttr::MapTypeTy> Res = |
| 3355 | OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(VD)) { |
| 3356 | bool UnifiedMemoryEnabled = |
| 3357 | getOpenMPRuntime().hasRequiresUnifiedSharedMemory(); |
| 3358 | if ((*Res == OMPDeclareTargetDeclAttr::MT_To || |
| 3359 | *Res == OMPDeclareTargetDeclAttr::MT_Enter) && |
| 3360 | !UnifiedMemoryEnabled) { |
| 3361 | (void)GetAddrOfGlobalVar(VD); |
| 3362 | } else { |
| 3363 | assert(((*Res == OMPDeclareTargetDeclAttr::MT_Link) ||(static_cast <bool> (((*Res == OMPDeclareTargetDeclAttr ::MT_Link) || ((*Res == OMPDeclareTargetDeclAttr::MT_To || *Res == OMPDeclareTargetDeclAttr::MT_Enter) && UnifiedMemoryEnabled )) && "Link clause or to clause with unified memory expected." ) ? void (0) : __assert_fail ("((*Res == OMPDeclareTargetDeclAttr::MT_Link) || ((*Res == OMPDeclareTargetDeclAttr::MT_To || *Res == OMPDeclareTargetDeclAttr::MT_Enter) && UnifiedMemoryEnabled)) && \"Link clause or to clause with unified memory expected.\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 3367, __extension__ __PRETTY_FUNCTION__ )) |
| 3364 | ((*Res == OMPDeclareTargetDeclAttr::MT_To ||(static_cast <bool> (((*Res == OMPDeclareTargetDeclAttr ::MT_Link) || ((*Res == OMPDeclareTargetDeclAttr::MT_To || *Res == OMPDeclareTargetDeclAttr::MT_Enter) && UnifiedMemoryEnabled )) && "Link clause or to clause with unified memory expected." ) ? void (0) : __assert_fail ("((*Res == OMPDeclareTargetDeclAttr::MT_Link) || ((*Res == OMPDeclareTargetDeclAttr::MT_To || *Res == OMPDeclareTargetDeclAttr::MT_Enter) && UnifiedMemoryEnabled)) && \"Link clause or to clause with unified memory expected.\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 3367, __extension__ __PRETTY_FUNCTION__ )) |
| 3365 | *Res == OMPDeclareTargetDeclAttr::MT_Enter) &&(static_cast <bool> (((*Res == OMPDeclareTargetDeclAttr ::MT_Link) || ((*Res == OMPDeclareTargetDeclAttr::MT_To || *Res == OMPDeclareTargetDeclAttr::MT_Enter) && UnifiedMemoryEnabled )) && "Link clause or to clause with unified memory expected." ) ? void (0) : __assert_fail ("((*Res == OMPDeclareTargetDeclAttr::MT_Link) || ((*Res == OMPDeclareTargetDeclAttr::MT_To || *Res == OMPDeclareTargetDeclAttr::MT_Enter) && UnifiedMemoryEnabled)) && \"Link clause or to clause with unified memory expected.\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 3367, __extension__ __PRETTY_FUNCTION__ )) |
| 3366 | UnifiedMemoryEnabled)) &&(static_cast <bool> (((*Res == OMPDeclareTargetDeclAttr ::MT_Link) || ((*Res == OMPDeclareTargetDeclAttr::MT_To || *Res == OMPDeclareTargetDeclAttr::MT_Enter) && UnifiedMemoryEnabled )) && "Link clause or to clause with unified memory expected." ) ? void (0) : __assert_fail ("((*Res == OMPDeclareTargetDeclAttr::MT_Link) || ((*Res == OMPDeclareTargetDeclAttr::MT_To || *Res == OMPDeclareTargetDeclAttr::MT_Enter) && UnifiedMemoryEnabled)) && \"Link clause or to clause with unified memory expected.\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 3367, __extension__ __PRETTY_FUNCTION__ )) |
| 3367 | "Link clause or to clause with unified memory expected.")(static_cast <bool> (((*Res == OMPDeclareTargetDeclAttr ::MT_Link) || ((*Res == OMPDeclareTargetDeclAttr::MT_To || *Res == OMPDeclareTargetDeclAttr::MT_Enter) && UnifiedMemoryEnabled )) && "Link clause or to clause with unified memory expected." ) ? void (0) : __assert_fail ("((*Res == OMPDeclareTargetDeclAttr::MT_Link) || ((*Res == OMPDeclareTargetDeclAttr::MT_To || *Res == OMPDeclareTargetDeclAttr::MT_Enter) && UnifiedMemoryEnabled)) && \"Link clause or to clause with unified memory expected.\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 3367, __extension__ __PRETTY_FUNCTION__ )); |
| 3368 | (void)getOpenMPRuntime().getAddrOfDeclareTargetVar(VD); |
| 3369 | } |
| 3370 | |
| 3371 | return; |
| 3372 | } |
| 3373 | } |
| 3374 | // If this declaration may have caused an inline variable definition to |
| 3375 | // change linkage, make sure that it's emitted. |
| 3376 | if (Context.getInlineVariableDefinitionKind(VD) == |
| 3377 | ASTContext::InlineVariableDefinitionKind::Strong) |
| 3378 | GetAddrOfGlobalVar(VD); |
| 3379 | return; |
| 3380 | } |
| 3381 | } |
| 3382 | |
| 3383 | // Defer code generation to first use when possible, e.g. if this is an inline |
| 3384 | // function. If the global must always be emitted, do it eagerly if possible |
| 3385 | // to benefit from cache locality. |
| 3386 | if (MustBeEmitted(Global) && MayBeEmittedEagerly(Global)) { |
| 3387 | // Emit the definition if it can't be deferred. |
| 3388 | EmitGlobalDefinition(GD); |
| 3389 | return; |
| 3390 | } |
| 3391 | |
| 3392 | // If we're deferring emission of a C++ variable with an |
| 3393 | // initializer, remember the order in which it appeared in the file. |
| 3394 | if (getLangOpts().CPlusPlus && isa<VarDecl>(Global) && |
| 3395 | cast<VarDecl>(Global)->hasInit()) { |
| 3396 | DelayedCXXInitPosition[Global] = CXXGlobalInits.size(); |
| 3397 | CXXGlobalInits.push_back(nullptr); |
| 3398 | } |
| 3399 | |
| 3400 | StringRef MangledName = getMangledName(GD); |
| 3401 | if (GetGlobalValue(MangledName) != nullptr) { |
| 3402 | // The value has already been used and should therefore be emitted. |
| 3403 | addDeferredDeclToEmit(GD); |
| 3404 | } else if (MustBeEmitted(Global)) { |
| 3405 | // The value must be emitted, but cannot be emitted eagerly. |
| 3406 | assert(!MayBeEmittedEagerly(Global))(static_cast <bool> (!MayBeEmittedEagerly(Global)) ? void (0) : __assert_fail ("!MayBeEmittedEagerly(Global)", "clang/lib/CodeGen/CodeGenModule.cpp" , 3406, __extension__ __PRETTY_FUNCTION__)); |
| 3407 | addDeferredDeclToEmit(GD); |
| 3408 | EmittedDeferredDecls[MangledName] = GD; |
| 3409 | } else { |
| 3410 | // Otherwise, remember that we saw a deferred decl with this name. The |
| 3411 | // first use of the mangled name will cause it to move into |
| 3412 | // DeferredDeclsToEmit. |
| 3413 | DeferredDecls[MangledName] = GD; |
| 3414 | } |
| 3415 | } |
| 3416 | |
| 3417 | // Check if T is a class type with a destructor that's not dllimport. |
| 3418 | static bool HasNonDllImportDtor(QualType T) { |
| 3419 | if (const auto *RT = T->getBaseElementTypeUnsafe()->getAs<RecordType>()) |
| 3420 | if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl())) |
| 3421 | if (RD->getDestructor() && !RD->getDestructor()->hasAttr<DLLImportAttr>()) |
| 3422 | return true; |
| 3423 | |
| 3424 | return false; |
| 3425 | } |
| 3426 | |
| 3427 | namespace { |
| 3428 | struct FunctionIsDirectlyRecursive |
| 3429 | : public ConstStmtVisitor<FunctionIsDirectlyRecursive, bool> { |
| 3430 | const StringRef Name; |
| 3431 | const Builtin::Context &BI; |
| 3432 | FunctionIsDirectlyRecursive(StringRef N, const Builtin::Context &C) |
| 3433 | : Name(N), BI(C) {} |
| 3434 | |
| 3435 | bool VisitCallExpr(const CallExpr *E) { |
| 3436 | const FunctionDecl *FD = E->getDirectCallee(); |
| 3437 | if (!FD) |
| 3438 | return false; |
| 3439 | AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>(); |
| 3440 | if (Attr && Name == Attr->getLabel()) |
| 3441 | return true; |
| 3442 | unsigned BuiltinID = FD->getBuiltinID(); |
| 3443 | if (!BuiltinID || !BI.isLibFunction(BuiltinID)) |
| 3444 | return false; |
| 3445 | StringRef BuiltinName = BI.getName(BuiltinID); |
| 3446 | if (BuiltinName.startswith("__builtin_") && |
| 3447 | Name == BuiltinName.slice(strlen("__builtin_"), StringRef::npos)) { |
| 3448 | return true; |
| 3449 | } |
| 3450 | return false; |
| 3451 | } |
| 3452 | |
| 3453 | bool VisitStmt(const Stmt *S) { |
| 3454 | for (const Stmt *Child : S->children()) |
| 3455 | if (Child && this->Visit(Child)) |
| 3456 | return true; |
| 3457 | return false; |
| 3458 | } |
| 3459 | }; |
| 3460 | |
| 3461 | // Make sure we're not referencing non-imported vars or functions. |
| 3462 | struct DLLImportFunctionVisitor |
| 3463 | : public RecursiveASTVisitor<DLLImportFunctionVisitor> { |
| 3464 | bool SafeToInline = true; |
| 3465 | |
| 3466 | bool shouldVisitImplicitCode() const { return true; } |
| 3467 | |
| 3468 | bool VisitVarDecl(VarDecl *VD) { |
| 3469 | if (VD->getTLSKind()) { |
| 3470 | // A thread-local variable cannot be imported. |
| 3471 | SafeToInline = false; |
| 3472 | return SafeToInline; |
| 3473 | } |
| 3474 | |
| 3475 | // A variable definition might imply a destructor call. |
| 3476 | if (VD->isThisDeclarationADefinition()) |
| 3477 | SafeToInline = !HasNonDllImportDtor(VD->getType()); |
| 3478 | |
| 3479 | return SafeToInline; |
| 3480 | } |
| 3481 | |
| 3482 | bool VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) { |
| 3483 | if (const auto *D = E->getTemporary()->getDestructor()) |
| 3484 | SafeToInline = D->hasAttr<DLLImportAttr>(); |
| 3485 | return SafeToInline; |
| 3486 | } |
| 3487 | |
| 3488 | bool VisitDeclRefExpr(DeclRefExpr *E) { |
| 3489 | ValueDecl *VD = E->getDecl(); |
| 3490 | if (isa<FunctionDecl>(VD)) |
| 3491 | SafeToInline = VD->hasAttr<DLLImportAttr>(); |
| 3492 | else if (VarDecl *V = dyn_cast<VarDecl>(VD)) |
| 3493 | SafeToInline = !V->hasGlobalStorage() || V->hasAttr<DLLImportAttr>(); |
| 3494 | return SafeToInline; |
| 3495 | } |
| 3496 | |
| 3497 | bool VisitCXXConstructExpr(CXXConstructExpr *E) { |
| 3498 | SafeToInline = E->getConstructor()->hasAttr<DLLImportAttr>(); |
| 3499 | return SafeToInline; |
| 3500 | } |
| 3501 | |
| 3502 | bool VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { |
| 3503 | CXXMethodDecl *M = E->getMethodDecl(); |
| 3504 | if (!M) { |
| 3505 | // Call through a pointer to member function. This is safe to inline. |
| 3506 | SafeToInline = true; |
| 3507 | } else { |
| 3508 | SafeToInline = M->hasAttr<DLLImportAttr>(); |
| 3509 | } |
| 3510 | return SafeToInline; |
| 3511 | } |
| 3512 | |
| 3513 | bool VisitCXXDeleteExpr(CXXDeleteExpr *E) { |
| 3514 | SafeToInline = E->getOperatorDelete()->hasAttr<DLLImportAttr>(); |
| 3515 | return SafeToInline; |
| 3516 | } |
| 3517 | |
| 3518 | bool VisitCXXNewExpr(CXXNewExpr *E) { |
| 3519 | SafeToInline = E->getOperatorNew()->hasAttr<DLLImportAttr>(); |
| 3520 | return SafeToInline; |
| 3521 | } |
| 3522 | }; |
| 3523 | } |
| 3524 | |
| 3525 | // isTriviallyRecursive - Check if this function calls another |
| 3526 | // decl that, because of the asm attribute or the other decl being a builtin, |
| 3527 | // ends up pointing to itself. |
| 3528 | bool |
| 3529 | CodeGenModule::isTriviallyRecursive(const FunctionDecl *FD) { |
| 3530 | StringRef Name; |
| 3531 | if (getCXXABI().getMangleContext().shouldMangleDeclName(FD)) { |
| 3532 | // asm labels are a special kind of mangling we have to support. |
| 3533 | AsmLabelAttr *Attr = FD->getAttr<AsmLabelAttr>(); |
| 3534 | if (!Attr) |
| 3535 | return false; |
| 3536 | Name = Attr->getLabel(); |
| 3537 | } else { |
| 3538 | Name = FD->getName(); |
| 3539 | } |
| 3540 | |
| 3541 | FunctionIsDirectlyRecursive Walker(Name, Context.BuiltinInfo); |
| 3542 | const Stmt *Body = FD->getBody(); |
| 3543 | return Body ? Walker.Visit(Body) : false; |
| 3544 | } |
| 3545 | |
| 3546 | bool CodeGenModule::shouldEmitFunction(GlobalDecl GD) { |
| 3547 | if (getFunctionLinkage(GD) != llvm::Function::AvailableExternallyLinkage) |
| 3548 | return true; |
| 3549 | const auto *F = cast<FunctionDecl>(GD.getDecl()); |
| 3550 | if (CodeGenOpts.OptimizationLevel == 0 && !F->hasAttr<AlwaysInlineAttr>()) |
| 3551 | return false; |
| 3552 | |
| 3553 | if (F->hasAttr<DLLImportAttr>() && !F->hasAttr<AlwaysInlineAttr>()) { |
| 3554 | // Check whether it would be safe to inline this dllimport function. |
| 3555 | DLLImportFunctionVisitor Visitor; |
| 3556 | Visitor.TraverseFunctionDecl(const_cast<FunctionDecl*>(F)); |
| 3557 | if (!Visitor.SafeToInline) |
| 3558 | return false; |
| 3559 | |
| 3560 | if (const CXXDestructorDecl *Dtor = dyn_cast<CXXDestructorDecl>(F)) { |
| 3561 | // Implicit destructor invocations aren't captured in the AST, so the |
| 3562 | // check above can't see them. Check for them manually here. |
| 3563 | for (const Decl *Member : Dtor->getParent()->decls()) |
| 3564 | if (isa<FieldDecl>(Member)) |
| 3565 | if (HasNonDllImportDtor(cast<FieldDecl>(Member)->getType())) |
| 3566 | return false; |
| 3567 | for (const CXXBaseSpecifier &B : Dtor->getParent()->bases()) |
| 3568 | if (HasNonDllImportDtor(B.getType())) |
| 3569 | return false; |
| 3570 | } |
| 3571 | } |
| 3572 | |
| 3573 | // Inline builtins declaration must be emitted. They often are fortified |
| 3574 | // functions. |
| 3575 | if (F->isInlineBuiltinDeclaration()) |
| 3576 | return true; |
| 3577 | |
| 3578 | // PR9614. Avoid cases where the source code is lying to us. An available |
| 3579 | // externally function should have an equivalent function somewhere else, |
| 3580 | // but a function that calls itself through asm label/`__builtin_` trickery is |
| 3581 | // clearly not equivalent to the real implementation. |
| 3582 | // This happens in glibc's btowc and in some configure checks. |
| 3583 | return !isTriviallyRecursive(F); |
| 3584 | } |
| 3585 | |
| 3586 | bool CodeGenModule::shouldOpportunisticallyEmitVTables() { |
| 3587 | return CodeGenOpts.OptimizationLevel > 0; |
| 3588 | } |
| 3589 | |
| 3590 | void CodeGenModule::EmitMultiVersionFunctionDefinition(GlobalDecl GD, |
| 3591 | llvm::GlobalValue *GV) { |
| 3592 | const auto *FD = cast<FunctionDecl>(GD.getDecl()); |
| 3593 | |
| 3594 | if (FD->isCPUSpecificMultiVersion()) { |
| 3595 | auto *Spec = FD->getAttr<CPUSpecificAttr>(); |
| 3596 | for (unsigned I = 0; I < Spec->cpus_size(); ++I) |
| 3597 | EmitGlobalFunctionDefinition(GD.getWithMultiVersionIndex(I), nullptr); |
| 3598 | } else if (FD->isTargetClonesMultiVersion()) { |
| 3599 | auto *Clone = FD->getAttr<TargetClonesAttr>(); |
| 3600 | for (unsigned I = 0; I < Clone->featuresStrs_size(); ++I) |
| 3601 | if (Clone->isFirstOfVersion(I)) |
| 3602 | EmitGlobalFunctionDefinition(GD.getWithMultiVersionIndex(I), nullptr); |
| 3603 | // Ensure that the resolver function is also emitted. |
| 3604 | GetOrCreateMultiVersionResolver(GD); |
| 3605 | } else |
| 3606 | EmitGlobalFunctionDefinition(GD, GV); |
| 3607 | } |
| 3608 | |
| 3609 | void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD, llvm::GlobalValue *GV) { |
| 3610 | const auto *D = cast<ValueDecl>(GD.getDecl()); |
| 3611 | |
| 3612 | PrettyStackTraceDecl CrashInfo(const_cast<ValueDecl *>(D), D->getLocation(), |
| 3613 | Context.getSourceManager(), |
| 3614 | "Generating code for declaration"); |
| 3615 | |
| 3616 | if (const auto *FD = dyn_cast<FunctionDecl>(D)) { |
| 3617 | // At -O0, don't generate IR for functions with available_externally |
| 3618 | // linkage. |
| 3619 | if (!shouldEmitFunction(GD)) |
| 3620 | return; |
| 3621 | |
| 3622 | llvm::TimeTraceScope TimeScope("CodeGen Function", [&]() { |
| 3623 | std::string Name; |
| 3624 | llvm::raw_string_ostream OS(Name); |
| 3625 | FD->getNameForDiagnostic(OS, getContext().getPrintingPolicy(), |
| 3626 | /*Qualified=*/true); |
| 3627 | return Name; |
| 3628 | }); |
| 3629 | |
| 3630 | if (const auto *Method = dyn_cast<CXXMethodDecl>(D)) { |
| 3631 | // Make sure to emit the definition(s) before we emit the thunks. |
| 3632 | // This is necessary for the generation of certain thunks. |
| 3633 | if (isa<CXXConstructorDecl>(Method) || isa<CXXDestructorDecl>(Method)) |
| 3634 | ABI->emitCXXStructor(GD); |
| 3635 | else if (FD->isMultiVersion()) |
| 3636 | EmitMultiVersionFunctionDefinition(GD, GV); |
| 3637 | else |
| 3638 | EmitGlobalFunctionDefinition(GD, GV); |
| 3639 | |
| 3640 | if (Method->isVirtual()) |
| 3641 | getVTables().EmitThunks(GD); |
| 3642 | |
| 3643 | return; |
| 3644 | } |
| 3645 | |
| 3646 | if (FD->isMultiVersion()) |
| 3647 | return EmitMultiVersionFunctionDefinition(GD, GV); |
| 3648 | return EmitGlobalFunctionDefinition(GD, GV); |
| 3649 | } |
| 3650 | |
| 3651 | if (const auto *VD = dyn_cast<VarDecl>(D)) |
| 3652 | return EmitGlobalVarDefinition(VD, !VD->hasDefinition()); |
| 3653 | |
| 3654 | llvm_unreachable("Invalid argument to EmitGlobalDefinition()")::llvm::llvm_unreachable_internal("Invalid argument to EmitGlobalDefinition()" , "clang/lib/CodeGen/CodeGenModule.cpp", 3654); |
| 3655 | } |
| 3656 | |
| 3657 | static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old, |
| 3658 | llvm::Function *NewFn); |
| 3659 | |
| 3660 | static unsigned |
| 3661 | TargetMVPriority(const TargetInfo &TI, |
| 3662 | const CodeGenFunction::MultiVersionResolverOption &RO) { |
| 3663 | unsigned Priority = 0; |
| 3664 | unsigned NumFeatures = 0; |
| 3665 | for (StringRef Feat : RO.Conditions.Features) { |
| 3666 | Priority = std::max(Priority, TI.multiVersionSortPriority(Feat)); |
| 3667 | NumFeatures++; |
| 3668 | } |
| 3669 | |
| 3670 | if (!RO.Conditions.Architecture.empty()) |
| 3671 | Priority = std::max( |
| 3672 | Priority, TI.multiVersionSortPriority(RO.Conditions.Architecture)); |
| 3673 | |
| 3674 | Priority += TI.multiVersionFeatureCost() * NumFeatures; |
| 3675 | |
| 3676 | return Priority; |
| 3677 | } |
| 3678 | |
| 3679 | // Multiversion functions should be at most 'WeakODRLinkage' so that a different |
| 3680 | // TU can forward declare the function without causing problems. Particularly |
| 3681 | // in the cases of CPUDispatch, this causes issues. This also makes sure we |
| 3682 | // work with internal linkage functions, so that the same function name can be |
| 3683 | // used with internal linkage in multiple TUs. |
| 3684 | llvm::GlobalValue::LinkageTypes getMultiversionLinkage(CodeGenModule &CGM, |
| 3685 | GlobalDecl GD) { |
| 3686 | const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl()); |
| 3687 | if (FD->getFormalLinkage() == InternalLinkage) |
| 3688 | return llvm::GlobalValue::InternalLinkage; |
| 3689 | return llvm::GlobalValue::WeakODRLinkage; |
| 3690 | } |
| 3691 | |
| 3692 | void CodeGenModule::emitMultiVersionFunctions() { |
| 3693 | std::vector<GlobalDecl> MVFuncsToEmit; |
| 3694 | MultiVersionFuncs.swap(MVFuncsToEmit); |
| 3695 | for (GlobalDecl GD : MVFuncsToEmit) { |
| 3696 | const auto *FD = cast<FunctionDecl>(GD.getDecl()); |
| 3697 | assert(FD && "Expected a FunctionDecl")(static_cast <bool> (FD && "Expected a FunctionDecl" ) ? void (0) : __assert_fail ("FD && \"Expected a FunctionDecl\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 3697, __extension__ __PRETTY_FUNCTION__ )); |
| 3698 | |
| 3699 | SmallVector<CodeGenFunction::MultiVersionResolverOption, 10> Options; |
| 3700 | if (FD->isTargetMultiVersion()) { |
| 3701 | getContext().forEachMultiversionedFunctionVersion( |
| 3702 | FD, [this, &GD, &Options](const FunctionDecl *CurFD) { |
| 3703 | GlobalDecl CurGD{ |
| 3704 | (CurFD->isDefined() ? CurFD->getDefinition() : CurFD)}; |
| 3705 | StringRef MangledName = getMangledName(CurGD); |
| 3706 | llvm::Constant *Func = GetGlobalValue(MangledName); |
| 3707 | if (!Func) { |
| 3708 | if (CurFD->isDefined()) { |
| 3709 | EmitGlobalFunctionDefinition(CurGD, nullptr); |
| 3710 | Func = GetGlobalValue(MangledName); |
| 3711 | } else { |
| 3712 | const CGFunctionInfo &FI = |
| 3713 | getTypes().arrangeGlobalDeclaration(GD); |
| 3714 | llvm::FunctionType *Ty = getTypes().GetFunctionType(FI); |
| 3715 | Func = GetAddrOfFunction(CurGD, Ty, /*ForVTable=*/false, |
| 3716 | /*DontDefer=*/false, ForDefinition); |
| 3717 | } |
| 3718 | 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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 3718, __extension__ __PRETTY_FUNCTION__ )); |
| 3719 | } |
| 3720 | if (CurFD->getMultiVersionKind() == MultiVersionKind::Target) { |
| 3721 | const auto *TA = CurFD->getAttr<TargetAttr>(); |
| 3722 | llvm::SmallVector<StringRef, 8> Feats; |
| 3723 | TA->getAddedFeatures(Feats); |
| 3724 | Options.emplace_back(cast<llvm::Function>(Func), |
| 3725 | TA->getArchitecture(), Feats); |
| 3726 | } else { |
| 3727 | const auto *TVA = CurFD->getAttr<TargetVersionAttr>(); |
| 3728 | llvm::SmallVector<StringRef, 8> Feats; |
| 3729 | TVA->getFeatures(Feats); |
| 3730 | Options.emplace_back(cast<llvm::Function>(Func), |
| 3731 | /*Architecture*/ "", Feats); |
| 3732 | } |
| 3733 | }); |
| 3734 | } else if (FD->isTargetClonesMultiVersion()) { |
| 3735 | const auto *TC = FD->getAttr<TargetClonesAttr>(); |
| 3736 | for (unsigned VersionIndex = 0; VersionIndex < TC->featuresStrs_size(); |
| 3737 | ++VersionIndex) { |
| 3738 | if (!TC->isFirstOfVersion(VersionIndex)) |
| 3739 | continue; |
| 3740 | GlobalDecl CurGD{(FD->isDefined() ? FD->getDefinition() : FD), |
| 3741 | VersionIndex}; |
| 3742 | StringRef Version = TC->getFeatureStr(VersionIndex); |
| 3743 | StringRef MangledName = getMangledName(CurGD); |
| 3744 | llvm::Constant *Func = GetGlobalValue(MangledName); |
| 3745 | if (!Func) { |
| 3746 | if (FD->isDefined()) { |
| 3747 | EmitGlobalFunctionDefinition(CurGD, nullptr); |
| 3748 | Func = GetGlobalValue(MangledName); |
| 3749 | } else { |
| 3750 | const CGFunctionInfo &FI = |
| 3751 | getTypes().arrangeGlobalDeclaration(CurGD); |
| 3752 | llvm::FunctionType *Ty = getTypes().GetFunctionType(FI); |
| 3753 | Func = GetAddrOfFunction(CurGD, Ty, /*ForVTable=*/false, |
| 3754 | /*DontDefer=*/false, ForDefinition); |
| 3755 | } |
| 3756 | 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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 3756, __extension__ __PRETTY_FUNCTION__ )); |
| 3757 | } |
| 3758 | |
| 3759 | StringRef Architecture; |
| 3760 | llvm::SmallVector<StringRef, 1> Feature; |
| 3761 | |
| 3762 | if (getTarget().getTriple().isAArch64()) { |
| 3763 | if (Version != "default") { |
| 3764 | llvm::SmallVector<StringRef, 8> VerFeats; |
| 3765 | Version.split(VerFeats, "+"); |
| 3766 | for (auto &CurFeat : VerFeats) |
| 3767 | Feature.push_back(CurFeat.trim()); |
| 3768 | } |
| 3769 | } else { |
| 3770 | if (Version.startswith("arch=")) |
| 3771 | Architecture = Version.drop_front(sizeof("arch=") - 1); |
| 3772 | else if (Version != "default") |
| 3773 | Feature.push_back(Version); |
| 3774 | } |
| 3775 | |
| 3776 | Options.emplace_back(cast<llvm::Function>(Func), Architecture, Feature); |
| 3777 | } |
| 3778 | } else { |
| 3779 | assert(0 && "Expected a target or target_clones multiversion function")(static_cast <bool> (0 && "Expected a target or target_clones multiversion function" ) ? void (0) : __assert_fail ("0 && \"Expected a target or target_clones multiversion function\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 3779, __extension__ __PRETTY_FUNCTION__ )); |
| 3780 | continue; |
| 3781 | } |
| 3782 | |
| 3783 | llvm::Constant *ResolverConstant = GetOrCreateMultiVersionResolver(GD); |
| 3784 | if (auto *IFunc = dyn_cast<llvm::GlobalIFunc>(ResolverConstant)) |
| 3785 | ResolverConstant = IFunc->getResolver(); |
| 3786 | llvm::Function *ResolverFunc = cast<llvm::Function>(ResolverConstant); |
| 3787 | |
| 3788 | ResolverFunc->setLinkage(getMultiversionLinkage(*this, GD)); |
| 3789 | |
| 3790 | if (supportsCOMDAT()) |
| 3791 | ResolverFunc->setComdat( |
| 3792 | getModule().getOrInsertComdat(ResolverFunc->getName())); |
| 3793 | |
| 3794 | const TargetInfo &TI = getTarget(); |
| 3795 | llvm::stable_sort( |
| 3796 | Options, [&TI](const CodeGenFunction::MultiVersionResolverOption &LHS, |
| 3797 | const CodeGenFunction::MultiVersionResolverOption &RHS) { |
| 3798 | return TargetMVPriority(TI, LHS) > TargetMVPriority(TI, RHS); |
| 3799 | }); |
| 3800 | CodeGenFunction CGF(*this); |
| 3801 | CGF.EmitMultiVersionResolver(ResolverFunc, Options); |
| 3802 | } |
| 3803 | |
| 3804 | // Ensure that any additions to the deferred decls list caused by emitting a |
| 3805 | // variant are emitted. This can happen when the variant itself is inline and |
| 3806 | // calls a function without linkage. |
| 3807 | if (!MVFuncsToEmit.empty()) |
| 3808 | EmitDeferred(); |
| 3809 | |
| 3810 | // Ensure that any additions to the multiversion funcs list from either the |
| 3811 | // deferred decls or the multiversion functions themselves are emitted. |
| 3812 | if (!MultiVersionFuncs.empty()) |
| 3813 | emitMultiVersionFunctions(); |
| 3814 | } |
| 3815 | |
| 3816 | void CodeGenModule::emitCPUDispatchDefinition(GlobalDecl GD) { |
| 3817 | const auto *FD = cast<FunctionDecl>(GD.getDecl()); |
| 3818 | assert(FD && "Not a FunctionDecl?")(static_cast <bool> (FD && "Not a FunctionDecl?" ) ? void (0) : __assert_fail ("FD && \"Not a FunctionDecl?\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 3818, __extension__ __PRETTY_FUNCTION__ )); |
| 3819 | assert(FD->isCPUDispatchMultiVersion() && "Not a multiversion function?")(static_cast <bool> (FD->isCPUDispatchMultiVersion() && "Not a multiversion function?") ? void (0) : __assert_fail ("FD->isCPUDispatchMultiVersion() && \"Not a multiversion function?\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 3819, __extension__ __PRETTY_FUNCTION__ )); |
| 3820 | const auto *DD = FD->getAttr<CPUDispatchAttr>(); |
| 3821 | 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?\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 3821, __extension__ __PRETTY_FUNCTION__ )); |
| 3822 | |
| 3823 | const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD); |
| 3824 | llvm::FunctionType *DeclTy = getTypes().GetFunctionType(FI); |
| 3825 | |
| 3826 | StringRef ResolverName = getMangledName(GD); |
| 3827 | UpdateMultiVersionNames(GD, FD, ResolverName); |
| 3828 | |
| 3829 | llvm::Type *ResolverType; |
| 3830 | GlobalDecl ResolverGD; |
| 3831 | if (getTarget().supportsIFunc()) { |
| 3832 | ResolverType = llvm::FunctionType::get( |
| 3833 | llvm::PointerType::get(DeclTy, |
| 3834 | getTypes().getTargetAddressSpace(FD->getType())), |
| 3835 | false); |
| 3836 | } |
| 3837 | else { |
| 3838 | ResolverType = DeclTy; |
| 3839 | ResolverGD = GD; |
| 3840 | } |
| 3841 | |
| 3842 | auto *ResolverFunc = cast<llvm::Function>(GetOrCreateLLVMFunction( |
| 3843 | ResolverName, ResolverType, ResolverGD, /*ForVTable=*/false)); |
| 3844 | ResolverFunc->setLinkage(getMultiversionLinkage(*this, GD)); |
| 3845 | if (supportsCOMDAT()) |
| 3846 | ResolverFunc->setComdat( |
| 3847 | getModule().getOrInsertComdat(ResolverFunc->getName())); |
| 3848 | |
| 3849 | SmallVector<CodeGenFunction::MultiVersionResolverOption, 10> Options; |
| 3850 | const TargetInfo &Target = getTarget(); |
| 3851 | unsigned Index = 0; |
| 3852 | for (const IdentifierInfo *II : DD->cpus()) { |
| 3853 | // Get the name of the target function so we can look it up/create it. |
| 3854 | std::string MangledName = getMangledNameImpl(*this, GD, FD, true) + |
| 3855 | getCPUSpecificMangling(*this, II->getName()); |
| 3856 | |
| 3857 | llvm::Constant *Func = GetGlobalValue(MangledName); |
| 3858 | |
| 3859 | if (!Func) { |
| 3860 | GlobalDecl ExistingDecl = Manglings.lookup(MangledName); |
| 3861 | if (ExistingDecl.getDecl() && |
| 3862 | ExistingDecl.getDecl()->getAsFunction()->isDefined()) { |
| 3863 | EmitGlobalFunctionDefinition(ExistingDecl, nullptr); |
| 3864 | Func = GetGlobalValue(MangledName); |
| 3865 | } else { |
| 3866 | if (!ExistingDecl.getDecl()) |
| 3867 | ExistingDecl = GD.getWithMultiVersionIndex(Index); |
| 3868 | |
| 3869 | Func = GetOrCreateLLVMFunction( |
| 3870 | MangledName, DeclTy, ExistingDecl, |
| 3871 | /*ForVTable=*/false, /*DontDefer=*/true, |
| 3872 | /*IsThunk=*/false, llvm::AttributeList(), ForDefinition); |
| 3873 | } |
| 3874 | } |
| 3875 | |
| 3876 | llvm::SmallVector<StringRef, 32> Features; |
| 3877 | Target.getCPUSpecificCPUDispatchFeatures(II->getName(), Features); |
| 3878 | llvm::transform(Features, Features.begin(), |
| 3879 | [](StringRef Str) { return Str.substr(1); }); |
| 3880 | llvm::erase_if(Features, [&Target](StringRef Feat) { |
| 3881 | return !Target.validateCpuSupports(Feat); |
| 3882 | }); |
| 3883 | Options.emplace_back(cast<llvm::Function>(Func), StringRef{}, Features); |
| 3884 | ++Index; |
| 3885 | } |
| 3886 | |
| 3887 | llvm::stable_sort( |
| 3888 | Options, [](const CodeGenFunction::MultiVersionResolverOption &LHS, |
| 3889 | const CodeGenFunction::MultiVersionResolverOption &RHS) { |
| 3890 | return llvm::X86::getCpuSupportsMask(LHS.Conditions.Features) > |
| 3891 | llvm::X86::getCpuSupportsMask(RHS.Conditions.Features); |
| 3892 | }); |
| 3893 | |
| 3894 | // If the list contains multiple 'default' versions, such as when it contains |
| 3895 | // 'pentium' and 'generic', don't emit the call to the generic one (since we |
| 3896 | // always run on at least a 'pentium'). We do this by deleting the 'least |
| 3897 | // advanced' (read, lowest mangling letter). |
| 3898 | while (Options.size() > 1 && |
| 3899 | llvm::X86::getCpuSupportsMask( |
| 3900 | (Options.end() - 2)->Conditions.Features) == 0) { |
| 3901 | StringRef LHSName = (Options.end() - 2)->Function->getName(); |
| 3902 | StringRef RHSName = (Options.end() - 1)->Function->getName(); |
| 3903 | if (LHSName.compare(RHSName) < 0) |
| 3904 | Options.erase(Options.end() - 2); |
| 3905 | else |
| 3906 | Options.erase(Options.end() - 1); |
| 3907 | } |
| 3908 | |
| 3909 | CodeGenFunction CGF(*this); |
| 3910 | CGF.EmitMultiVersionResolver(ResolverFunc, Options); |
| 3911 | |
| 3912 | if (getTarget().supportsIFunc()) { |
| 3913 | llvm::GlobalValue::LinkageTypes Linkage = getMultiversionLinkage(*this, GD); |
| 3914 | auto *IFunc = cast<llvm::GlobalValue>(GetOrCreateMultiVersionResolver(GD)); |
| 3915 | |
| 3916 | // Fix up function declarations that were created for cpu_specific before |
| 3917 | // cpu_dispatch was known |
| 3918 | if (!isa<llvm::GlobalIFunc>(IFunc)) { |
| 3919 | assert(cast<llvm::Function>(IFunc)->isDeclaration())(static_cast <bool> (cast<llvm::Function>(IFunc)-> isDeclaration()) ? void (0) : __assert_fail ("cast<llvm::Function>(IFunc)->isDeclaration()" , "clang/lib/CodeGen/CodeGenModule.cpp", 3919, __extension__ __PRETTY_FUNCTION__ )); |
| 3920 | auto *GI = llvm::GlobalIFunc::create(DeclTy, 0, Linkage, "", ResolverFunc, |
| 3921 | &getModule()); |
| 3922 | GI->takeName(IFunc); |
| 3923 | IFunc->replaceAllUsesWith(GI); |
| 3924 | IFunc->eraseFromParent(); |
| 3925 | IFunc = GI; |
| 3926 | } |
| 3927 | |
| 3928 | std::string AliasName = getMangledNameImpl( |
| 3929 | *this, GD, FD, /*OmitMultiVersionMangling=*/true); |
| 3930 | llvm::Constant *AliasFunc = GetGlobalValue(AliasName); |
| 3931 | if (!AliasFunc) { |
| 3932 | auto *GA = llvm::GlobalAlias::create(DeclTy, 0, Linkage, AliasName, IFunc, |
| 3933 | &getModule()); |
| 3934 | SetCommonAttributes(GD, GA); |
| 3935 | } |
| 3936 | } |
| 3937 | } |
| 3938 | |
| 3939 | /// If a dispatcher for the specified mangled name is not in the module, create |
| 3940 | /// and return an llvm Function with the specified type. |
| 3941 | llvm::Constant *CodeGenModule::GetOrCreateMultiVersionResolver(GlobalDecl GD) { |
| 3942 | const auto *FD = cast<FunctionDecl>(GD.getDecl()); |
| 3943 | assert(FD && "Not a FunctionDecl?")(static_cast <bool> (FD && "Not a FunctionDecl?" ) ? void (0) : __assert_fail ("FD && \"Not a FunctionDecl?\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 3943, __extension__ __PRETTY_FUNCTION__ )); |
| 3944 | |
| 3945 | std::string MangledName = |
| 3946 | getMangledNameImpl(*this, GD, FD, /*OmitMultiVersionMangling=*/true); |
| 3947 | |
| 3948 | // Holds the name of the resolver, in ifunc mode this is the ifunc (which has |
| 3949 | // a separate resolver). |
| 3950 | std::string ResolverName = MangledName; |
| 3951 | if (getTarget().supportsIFunc()) |
| 3952 | ResolverName += ".ifunc"; |
| 3953 | else if (FD->isTargetMultiVersion()) |
| 3954 | ResolverName += ".resolver"; |
| 3955 | |
| 3956 | // If the resolver has already been created, just return it. |
| 3957 | if (llvm::GlobalValue *ResolverGV = GetGlobalValue(ResolverName)) |
| 3958 | return ResolverGV; |
| 3959 | |
| 3960 | const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD); |
| 3961 | llvm::FunctionType *DeclTy = getTypes().GetFunctionType(FI); |
| 3962 | |
| 3963 | // The resolver needs to be created. For target and target_clones, defer |
| 3964 | // creation until the end of the TU. |
| 3965 | if (FD->isTargetMultiVersion() || FD->isTargetClonesMultiVersion()) |
| 3966 | MultiVersionFuncs.push_back(GD); |
| 3967 | |
| 3968 | // For cpu_specific, don't create an ifunc yet because we don't know if the |
| 3969 | // cpu_dispatch will be emitted in this translation unit. |
| 3970 | if (getTarget().supportsIFunc() && !FD->isCPUSpecificMultiVersion()) { |
| 3971 | llvm::Type *ResolverType = llvm::FunctionType::get( |
| 3972 | llvm::PointerType::get(DeclTy, |
| 3973 | getTypes().getTargetAddressSpace(FD->getType())), |
| 3974 | false); |
| 3975 | llvm::Constant *Resolver = GetOrCreateLLVMFunction( |
| 3976 | MangledName + ".resolver", ResolverType, GlobalDecl{}, |
| 3977 | /*ForVTable=*/false); |
| 3978 | llvm::GlobalIFunc *GIF = |
| 3979 | llvm::GlobalIFunc::create(DeclTy, 0, getMultiversionLinkage(*this, GD), |
| 3980 | "", Resolver, &getModule()); |
| 3981 | GIF->setName(ResolverName); |
| 3982 | SetCommonAttributes(FD, GIF); |
| 3983 | |
| 3984 | return GIF; |
| 3985 | } |
| 3986 | |
| 3987 | llvm::Constant *Resolver = GetOrCreateLLVMFunction( |
| 3988 | ResolverName, DeclTy, GlobalDecl{}, /*ForVTable=*/false); |
| 3989 | 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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 3990, __extension__ __PRETTY_FUNCTION__ )) |
| 3990 | "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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 3990, __extension__ __PRETTY_FUNCTION__ )); |
| 3991 | SetCommonAttributes(FD, cast<llvm::GlobalValue>(Resolver)); |
| 3992 | return Resolver; |
| 3993 | } |
| 3994 | |
| 3995 | /// GetOrCreateLLVMFunction - If the specified mangled name is not in the |
| 3996 | /// module, create and return an llvm Function with the specified type. If there |
| 3997 | /// is something in the module with the specified name, return it potentially |
| 3998 | /// bitcasted to the right type. |
| 3999 | /// |
| 4000 | /// If D is non-null, it specifies a decl that correspond to this. This is used |
| 4001 | /// to set the attributes on the function when it is first created. |
| 4002 | llvm::Constant *CodeGenModule::GetOrCreateLLVMFunction( |
| 4003 | StringRef MangledName, llvm::Type *Ty, GlobalDecl GD, bool ForVTable, |
| 4004 | bool DontDefer, bool IsThunk, llvm::AttributeList ExtraAttrs, |
| 4005 | ForDefinition_t IsForDefinition) { |
| 4006 | const Decl *D = GD.getDecl(); |
| 4007 | |
| 4008 | // Any attempts to use a MultiVersion function should result in retrieving |
| 4009 | // the iFunc instead. Name Mangling will handle the rest of the changes. |
| 4010 | if (const FunctionDecl *FD = cast_or_null<FunctionDecl>(D)) { |
| 4011 | // For the device mark the function as one that should be emitted. |
| 4012 | if (getLangOpts().OpenMPIsDevice && OpenMPRuntime && |
| 4013 | !OpenMPRuntime->markAsGlobalTarget(GD) && FD->isDefined() && |
| 4014 | !DontDefer && !IsForDefinition) { |
| 4015 | if (const FunctionDecl *FDDef = FD->getDefinition()) { |
| 4016 | GlobalDecl GDDef; |
| 4017 | if (const auto *CD = dyn_cast<CXXConstructorDecl>(FDDef)) |
| 4018 | GDDef = GlobalDecl(CD, GD.getCtorType()); |
| 4019 | else if (const auto *DD = dyn_cast<CXXDestructorDecl>(FDDef)) |
| 4020 | GDDef = GlobalDecl(DD, GD.getDtorType()); |
| 4021 | else |
| 4022 | GDDef = GlobalDecl(FDDef); |
| 4023 | EmitGlobal(GDDef); |
| 4024 | } |
| 4025 | } |
| 4026 | |
| 4027 | if (FD->isMultiVersion()) { |
| 4028 | UpdateMultiVersionNames(GD, FD, MangledName); |
| 4029 | if (!IsForDefinition) |
| 4030 | return GetOrCreateMultiVersionResolver(GD); |
| 4031 | } |
| 4032 | } |
| 4033 | |
| 4034 | // Lookup the entry, lazily creating it if necessary. |
| 4035 | llvm::GlobalValue *Entry = GetGlobalValue(MangledName); |
| 4036 | if (Entry) { |
| 4037 | if (WeakRefReferences.erase(Entry)) { |
| 4038 | const FunctionDecl *FD = cast_or_null<FunctionDecl>(D); |
| 4039 | if (FD && !FD->hasAttr<WeakAttr>()) |
| 4040 | Entry->setLinkage(llvm::Function::ExternalLinkage); |
| 4041 | } |
| 4042 | |
| 4043 | // Handle dropped DLL attributes. |
| 4044 | if (D && !D->hasAttr<DLLImportAttr>() && !D->hasAttr<DLLExportAttr>() && |
| 4045 | !shouldMapVisibilityToDLLExport(cast_or_null<NamedDecl>(D))) { |
| 4046 | Entry->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass); |
| 4047 | setDSOLocal(Entry); |
| 4048 | } |
| 4049 | |
| 4050 | // If there are two attempts to define the same mangled name, issue an |
| 4051 | // error. |
| 4052 | if (IsForDefinition && !Entry->isDeclaration()) { |
| 4053 | GlobalDecl OtherGD; |
| 4054 | // Check that GD is not yet in DiagnosedConflictingDefinitions is required |
| 4055 | // to make sure that we issue an error only once. |
| 4056 | if (lookupRepresentativeDecl(MangledName, OtherGD) && |
| 4057 | (GD.getCanonicalDecl().getDecl() != |
| 4058 | OtherGD.getCanonicalDecl().getDecl()) && |
| 4059 | DiagnosedConflictingDefinitions.insert(GD).second) { |
| 4060 | getDiags().Report(D->getLocation(), diag::err_duplicate_mangled_name) |
| 4061 | << MangledName; |
| 4062 | getDiags().Report(OtherGD.getDecl()->getLocation(), |
| 4063 | diag::note_previous_definition); |
| 4064 | } |
| 4065 | } |
| 4066 | |
| 4067 | if ((isa<llvm::Function>(Entry) || isa<llvm::GlobalAlias>(Entry)) && |
| 4068 | (Entry->getValueType() == Ty)) { |
| 4069 | return Entry; |
| 4070 | } |
| 4071 | |
| 4072 | // Make sure the result is of the correct type. |
| 4073 | // (If function is requested for a definition, we always need to create a new |
| 4074 | // function, not just return a bitcast.) |
| 4075 | if (!IsForDefinition) |
| 4076 | return llvm::ConstantExpr::getBitCast( |
| 4077 | Entry, Ty->getPointerTo(Entry->getAddressSpace())); |
| 4078 | } |
| 4079 | |
| 4080 | // This function doesn't have a complete type (for example, the return |
| 4081 | // type is an incomplete struct). Use a fake type instead, and make |
| 4082 | // sure not to try to set attributes. |
| 4083 | bool IsIncompleteFunction = false; |
| 4084 | |
| 4085 | llvm::FunctionType *FTy; |
| 4086 | if (isa<llvm::FunctionType>(Ty)) { |
| 4087 | FTy = cast<llvm::FunctionType>(Ty); |
| 4088 | } else { |
| 4089 | FTy = llvm::FunctionType::get(VoidTy, false); |
| 4090 | IsIncompleteFunction = true; |
| 4091 | } |
| 4092 | |
| 4093 | llvm::Function *F = |
| 4094 | llvm::Function::Create(FTy, llvm::Function::ExternalLinkage, |
| 4095 | Entry ? StringRef() : MangledName, &getModule()); |
| 4096 | |
| 4097 | // If we already created a function with the same mangled name (but different |
| 4098 | // type) before, take its name and add it to the list of functions to be |
| 4099 | // replaced with F at the end of CodeGen. |
| 4100 | // |
| 4101 | // This happens if there is a prototype for a function (e.g. "int f()") and |
| 4102 | // then a definition of a different type (e.g. "int f(int x)"). |
| 4103 | if (Entry) { |
| 4104 | F->takeName(Entry); |
| 4105 | |
| 4106 | // This might be an implementation of a function without a prototype, in |
| 4107 | // which case, try to do special replacement of calls which match the new |
| 4108 | // prototype. The really key thing here is that we also potentially drop |
| 4109 | // arguments from the call site so as to make a direct call, which makes the |
| 4110 | // inliner happier and suppresses a number of optimizer warnings (!) about |
| 4111 | // dropping arguments. |
| 4112 | if (!Entry->use_empty()) { |
| 4113 | ReplaceUsesOfNonProtoTypeWithRealFunction(Entry, F); |
| 4114 | Entry->removeDeadConstantUsers(); |
| 4115 | } |
| 4116 | |
| 4117 | llvm::Constant *BC = llvm::ConstantExpr::getBitCast( |
| 4118 | F, Entry->getValueType()->getPointerTo(Entry->getAddressSpace())); |
| 4119 | addGlobalValReplacement(Entry, BC); |
| 4120 | } |
| 4121 | |
| 4122 | 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!\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 4122, __extension__ __PRETTY_FUNCTION__ )); |
| 4123 | if (D) |
| 4124 | SetFunctionAttributes(GD, F, IsIncompleteFunction, IsThunk); |
| 4125 | if (ExtraAttrs.hasFnAttrs()) { |
| 4126 | llvm::AttrBuilder B(F->getContext(), ExtraAttrs.getFnAttrs()); |
| 4127 | F->addFnAttrs(B); |
| 4128 | } |
| 4129 | |
| 4130 | if (!DontDefer) { |
| 4131 | // All MSVC dtors other than the base dtor are linkonce_odr and delegate to |
| 4132 | // each other bottoming out with the base dtor. Therefore we emit non-base |
| 4133 | // dtors on usage, even if there is no dtor definition in the TU. |
| 4134 | if (isa_and_nonnull<CXXDestructorDecl>(D) && |
| 4135 | getCXXABI().useThunkForDtorVariant(cast<CXXDestructorDecl>(D), |
| 4136 | GD.getDtorType())) |
| 4137 | addDeferredDeclToEmit(GD); |
| 4138 | |
| 4139 | // This is the first use or definition of a mangled name. If there is a |
| 4140 | // deferred decl with this name, remember that we need to emit it at the end |
| 4141 | // of the file. |
| 4142 | auto DDI = DeferredDecls.find(MangledName); |
| 4143 | if (DDI != DeferredDecls.end()) { |
| 4144 | // Move the potentially referenced deferred decl to the |
| 4145 | // DeferredDeclsToEmit list, and remove it from DeferredDecls (since we |
| 4146 | // don't need it anymore). |
| 4147 | addDeferredDeclToEmit(DDI->second); |
| 4148 | EmittedDeferredDecls[DDI->first] = DDI->second; |
| 4149 | DeferredDecls.erase(DDI); |
| 4150 | |
| 4151 | // Otherwise, there are cases we have to worry about where we're |
| 4152 | // using a declaration for which we must emit a definition but where |
| 4153 | // we might not find a top-level definition: |
| 4154 | // - member functions defined inline in their classes |
| 4155 | // - friend functions defined inline in some class |
| 4156 | // - special member functions with implicit definitions |
| 4157 | // If we ever change our AST traversal to walk into class methods, |
| 4158 | // this will be unnecessary. |
| 4159 | // |
| 4160 | // We also don't emit a definition for a function if it's going to be an |
| 4161 | // entry in a vtable, unless it's already marked as used. |
| 4162 | } else if (getLangOpts().CPlusPlus && D) { |
| 4163 | // Look for a declaration that's lexically in a record. |
| 4164 | for (const auto *FD = cast<FunctionDecl>(D)->getMostRecentDecl(); FD; |
| 4165 | FD = FD->getPreviousDecl()) { |
| 4166 | if (isa<CXXRecordDecl>(FD->getLexicalDeclContext())) { |
| 4167 | if (FD->doesThisDeclarationHaveABody()) { |
| 4168 | addDeferredDeclToEmit(GD.getWithDecl(FD)); |
| 4169 | break; |
| 4170 | } |
| 4171 | } |
| 4172 | } |
| 4173 | } |
| 4174 | } |
| 4175 | |
| 4176 | // Make sure the result is of the requested type. |
| 4177 | if (!IsIncompleteFunction) { |
| 4178 | assert(F->getFunctionType() == Ty)(static_cast <bool> (F->getFunctionType() == Ty) ? void (0) : __assert_fail ("F->getFunctionType() == Ty", "clang/lib/CodeGen/CodeGenModule.cpp" , 4178, __extension__ __PRETTY_FUNCTION__)); |
| 4179 | return F; |
| 4180 | } |
| 4181 | |
| 4182 | return llvm::ConstantExpr::getBitCast(F, |
| 4183 | Ty->getPointerTo(F->getAddressSpace())); |
| 4184 | } |
| 4185 | |
| 4186 | /// GetAddrOfFunction - Return the address of the given function. If Ty is |
| 4187 | /// non-null, then this function will use the specified type if it has to |
| 4188 | /// create it (this occurs when we see a definition of the function). |
| 4189 | llvm::Constant *CodeGenModule::GetAddrOfFunction(GlobalDecl GD, |
| 4190 | llvm::Type *Ty, |
| 4191 | bool ForVTable, |
| 4192 | bool DontDefer, |
| 4193 | ForDefinition_t IsForDefinition) { |
| 4194 | 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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 4195, __extension__ __PRETTY_FUNCTION__ )) |
| 4195 | "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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 4195, __extension__ __PRETTY_FUNCTION__ )); |
| 4196 | // If there was no specific requested type, just convert it now. |
| 4197 | if (!Ty) { |
| 4198 | const auto *FD = cast<FunctionDecl>(GD.getDecl()); |
| 4199 | Ty = getTypes().ConvertType(FD->getType()); |
| 4200 | } |
| 4201 | |
| 4202 | // Devirtualized destructor calls may come through here instead of via |
| 4203 | // getAddrOfCXXStructor. Make sure we use the MS ABI base destructor instead |
| 4204 | // of the complete destructor when necessary. |
| 4205 | if (const auto *DD = dyn_cast<CXXDestructorDecl>(GD.getDecl())) { |
| 4206 | if (getTarget().getCXXABI().isMicrosoft() && |
| 4207 | GD.getDtorType() == Dtor_Complete && |
| 4208 | DD->getParent()->getNumVBases() == 0) |
| 4209 | GD = GlobalDecl(DD, Dtor_Base); |
| 4210 | } |
| 4211 | |
| 4212 | StringRef MangledName = getMangledName(GD); |
| 4213 | auto *F = GetOrCreateLLVMFunction(MangledName, Ty, GD, ForVTable, DontDefer, |
| 4214 | /*IsThunk=*/false, llvm::AttributeList(), |
| 4215 | IsForDefinition); |
| 4216 | // Returns kernel handle for HIP kernel stub function. |
| 4217 | if (LangOpts.CUDA && !LangOpts.CUDAIsDevice && |
| 4218 | cast<FunctionDecl>(GD.getDecl())->hasAttr<CUDAGlobalAttr>()) { |
| 4219 | auto *Handle = getCUDARuntime().getKernelHandle( |
| 4220 | cast<llvm::Function>(F->stripPointerCasts()), GD); |
| 4221 | if (IsForDefinition) |
| 4222 | return F; |
| 4223 | return llvm::ConstantExpr::getBitCast(Handle, Ty->getPointerTo()); |
| 4224 | } |
| 4225 | return F; |
| 4226 | } |
| 4227 | |
| 4228 | llvm::Constant *CodeGenModule::GetFunctionStart(const ValueDecl *Decl) { |
| 4229 | llvm::GlobalValue *F = |
| 4230 | cast<llvm::GlobalValue>(GetAddrOfFunction(Decl)->stripPointerCasts()); |
| 4231 | |
| 4232 | return llvm::ConstantExpr::getBitCast( |
| 4233 | llvm::NoCFIValue::get(F), |
| 4234 | llvm::Type::getInt8PtrTy(VMContext, F->getAddressSpace())); |
| 4235 | } |
| 4236 | |
| 4237 | static const FunctionDecl * |
| 4238 | GetRuntimeFunctionDecl(ASTContext &C, StringRef Name) { |
| 4239 | TranslationUnitDecl *TUDecl = C.getTranslationUnitDecl(); |
| 4240 | DeclContext *DC = TranslationUnitDecl::castToDeclContext(TUDecl); |
| 4241 | |
| 4242 | IdentifierInfo &CII = C.Idents.get(Name); |
| 4243 | for (const auto *Result : DC->lookup(&CII)) |
| 4244 | if (const auto *FD = dyn_cast<FunctionDecl>(Result)) |
| 4245 | return FD; |
| 4246 | |
| 4247 | if (!C.getLangOpts().CPlusPlus) |
| 4248 | return nullptr; |
| 4249 | |
| 4250 | // Demangle the premangled name from getTerminateFn() |
| 4251 | IdentifierInfo &CXXII = |
| 4252 | (Name == "_ZSt9terminatev" || Name == "?terminate@@YAXXZ") |
| 4253 | ? C.Idents.get("terminate") |
| 4254 | : C.Idents.get(Name); |
| 4255 | |
| 4256 | for (const auto &N : {"__cxxabiv1", "std"}) { |
| 4257 | IdentifierInfo &NS = C.Idents.get(N); |
| 4258 | for (const auto *Result : DC->lookup(&NS)) { |
| 4259 | const NamespaceDecl *ND = dyn_cast<NamespaceDecl>(Result); |
| 4260 | if (auto *LSD = dyn_cast<LinkageSpecDecl>(Result)) |
| 4261 | for (const auto *Result : LSD->lookup(&NS)) |
| 4262 | if ((ND = dyn_cast<NamespaceDecl>(Result))) |
| 4263 | break; |
| 4264 | |
| 4265 | if (ND) |
| 4266 | for (const auto *Result : ND->lookup(&CXXII)) |
| 4267 | if (const auto *FD = dyn_cast<FunctionDecl>(Result)) |
| 4268 | return FD; |
| 4269 | } |
| 4270 | } |
| 4271 | |
| 4272 | return nullptr; |
| 4273 | } |
| 4274 | |
| 4275 | /// CreateRuntimeFunction - Create a new runtime function with the specified |
| 4276 | /// type and name. |
| 4277 | llvm::FunctionCallee |
| 4278 | CodeGenModule::CreateRuntimeFunction(llvm::FunctionType *FTy, StringRef Name, |
| 4279 | llvm::AttributeList ExtraAttrs, bool Local, |
| 4280 | bool AssumeConvergent) { |
| 4281 | if (AssumeConvergent) { |
| 4282 | ExtraAttrs = |
| 4283 | ExtraAttrs.addFnAttribute(VMContext, llvm::Attribute::Convergent); |
| 4284 | } |
| 4285 | |
| 4286 | llvm::Constant *C = |
| 4287 | GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(), /*ForVTable=*/false, |
| 4288 | /*DontDefer=*/false, /*IsThunk=*/false, |
| 4289 | ExtraAttrs); |
| 4290 | |
| 4291 | if (auto *F = dyn_cast<llvm::Function>(C)) { |
| 4292 | if (F->empty()) { |
| 4293 | F->setCallingConv(getRuntimeCC()); |
| 4294 | |
| 4295 | // In Windows Itanium environments, try to mark runtime functions |
| 4296 | // dllimport. For Mingw and MSVC, don't. We don't really know if the user |
| 4297 | // will link their standard library statically or dynamically. Marking |
| 4298 | // functions imported when they are not imported can cause linker errors |
| 4299 | // and warnings. |
| 4300 | if (!Local && getTriple().isWindowsItaniumEnvironment() && |
| 4301 | !getCodeGenOpts().LTOVisibilityPublicStd) { |
| 4302 | const FunctionDecl *FD = GetRuntimeFunctionDecl(Context, Name); |
| 4303 | if (!FD || FD->hasAttr<DLLImportAttr>()) { |
| 4304 | F->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass); |
| 4305 | F->setLinkage(llvm::GlobalValue::ExternalLinkage); |
| 4306 | } |
| 4307 | } |
| 4308 | setDSOLocal(F); |
| 4309 | } |
| 4310 | } |
| 4311 | |
| 4312 | return {FTy, C}; |
| 4313 | } |
| 4314 | |
| 4315 | /// isTypeConstant - Determine whether an object of this type can be emitted |
| 4316 | /// as a constant. |
| 4317 | /// |
| 4318 | /// If ExcludeCtor is true, the duration when the object's constructor runs |
| 4319 | /// will not be considered. The caller will need to verify that the object is |
| 4320 | /// not written to during its construction. |
| 4321 | bool CodeGenModule::isTypeConstant(QualType Ty, bool ExcludeCtor) { |
| 4322 | if (!Ty.isConstant(Context) && !Ty->isReferenceType()) |
| 4323 | return false; |
| 4324 | |
| 4325 | if (Context.getLangOpts().CPlusPlus) { |
| 4326 | if (const CXXRecordDecl *Record |
| 4327 | = Context.getBaseElementType(Ty)->getAsCXXRecordDecl()) |
| 4328 | return ExcludeCtor && !Record->hasMutableFields() && |
| 4329 | Record->hasTrivialDestructor(); |
| 4330 | } |
| 4331 | |
| 4332 | return true; |
| 4333 | } |
| 4334 | |
| 4335 | /// GetOrCreateLLVMGlobal - If the specified mangled name is not in the module, |
| 4336 | /// create and return an llvm GlobalVariable with the specified type and address |
| 4337 | /// space. If there is something in the module with the specified name, return |
| 4338 | /// it potentially bitcasted to the right type. |
| 4339 | /// |
| 4340 | /// If D is non-null, it specifies a decl that correspond to this. This is used |
| 4341 | /// to set the attributes on the global when it is first created. |
| 4342 | /// |
| 4343 | /// If IsForDefinition is true, it is guaranteed that an actual global with |
| 4344 | /// type Ty will be returned, not conversion of a variable with the same |
| 4345 | /// mangled name but some other type. |
| 4346 | llvm::Constant * |
| 4347 | CodeGenModule::GetOrCreateLLVMGlobal(StringRef MangledName, llvm::Type *Ty, |
| 4348 | LangAS AddrSpace, const VarDecl *D, |
| 4349 | ForDefinition_t IsForDefinition) { |
| 4350 | // Lookup the entry, lazily creating it if necessary. |
| 4351 | llvm::GlobalValue *Entry = GetGlobalValue(MangledName); |
| 4352 | unsigned TargetAS = getContext().getTargetAddressSpace(AddrSpace); |
| 4353 | if (Entry) { |
| 4354 | if (WeakRefReferences.erase(Entry)) { |
| 4355 | if (D && !D->hasAttr<WeakAttr>()) |
| 4356 | Entry->setLinkage(llvm::Function::ExternalLinkage); |
| 4357 | } |
| 4358 | |
| 4359 | // Handle dropped DLL attributes. |
| 4360 | if (D && !D->hasAttr<DLLImportAttr>() && !D->hasAttr<DLLExportAttr>() && |
| 4361 | !shouldMapVisibilityToDLLExport(D)) |
| 4362 | Entry->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass); |
| 4363 | |
| 4364 | if (LangOpts.OpenMP && !LangOpts.OpenMPSimd && D) |
| 4365 | getOpenMPRuntime().registerTargetGlobalVariable(D, Entry); |
| 4366 | |
| 4367 | if (Entry->getValueType() == Ty && Entry->getAddressSpace() == TargetAS) |
| 4368 | return Entry; |
| 4369 | |
| 4370 | // If there are two attempts to define the same mangled name, issue an |
| 4371 | // error. |
| 4372 | if (IsForDefinition && !Entry->isDeclaration()) { |
| 4373 | GlobalDecl OtherGD; |
| 4374 | const VarDecl *OtherD; |
| 4375 | |
| 4376 | // Check that D is not yet in DiagnosedConflictingDefinitions is required |
| 4377 | // to make sure that we issue an error only once. |
| 4378 | if (D && lookupRepresentativeDecl(MangledName, OtherGD) && |
| 4379 | (D->getCanonicalDecl() != OtherGD.getCanonicalDecl().getDecl()) && |
| 4380 | (OtherD = dyn_cast<VarDecl>(OtherGD.getDecl())) && |
| 4381 | OtherD->hasInit() && |
| 4382 | DiagnosedConflictingDefinitions.insert(D).second) { |
| 4383 | getDiags().Report(D->getLocation(), diag::err_duplicate_mangled_name) |
| 4384 | << MangledName; |
| 4385 | getDiags().Report(OtherGD.getDecl()->getLocation(), |
| 4386 | diag::note_previous_definition); |
| 4387 | } |
| 4388 | } |
| 4389 | |
| 4390 | // Make sure the result is of the correct type. |
| 4391 | if (Entry->getType()->getAddressSpace() != TargetAS) { |
| 4392 | return llvm::ConstantExpr::getAddrSpaceCast(Entry, |
| 4393 | Ty->getPointerTo(TargetAS)); |
| 4394 | } |
| 4395 | |
| 4396 | // (If global is requested for a definition, we always need to create a new |
| 4397 | // global, not just return a bitcast.) |
| 4398 | if (!IsForDefinition) |
| 4399 | return llvm::ConstantExpr::getBitCast(Entry, Ty->getPointerTo(TargetAS)); |
| 4400 | } |
| 4401 | |
| 4402 | auto DAddrSpace = GetGlobalVarAddressSpace(D); |
| 4403 | |
| 4404 | auto *GV = new llvm::GlobalVariable( |
| 4405 | getModule(), Ty, false, llvm::GlobalValue::ExternalLinkage, nullptr, |
| 4406 | MangledName, nullptr, llvm::GlobalVariable::NotThreadLocal, |
| 4407 | getContext().getTargetAddressSpace(DAddrSpace)); |
| 4408 | |
| 4409 | // If we already created a global with the same mangled name (but different |
| 4410 | // type) before, take its name and remove it from its parent. |
| 4411 | if (Entry) { |
| 4412 | GV->takeName(Entry); |
| 4413 | |
| 4414 | if (!Entry->use_empty()) { |
| 4415 | llvm::Constant *NewPtrForOldDecl = |
| 4416 | llvm::ConstantExpr::getBitCast(GV, Entry->getType()); |
| 4417 | Entry->replaceAllUsesWith(NewPtrForOldDecl); |
| 4418 | } |
| 4419 | |
| 4420 | Entry->eraseFromParent(); |
| 4421 | } |
| 4422 | |
| 4423 | // This is the first use or definition of a mangled name. If there is a |
| 4424 | // deferred decl with this name, remember that we need to emit it at the end |
| 4425 | // of the file. |
| 4426 | auto DDI = DeferredDecls.find(MangledName); |
| 4427 | if (DDI != DeferredDecls.end()) { |
| 4428 | // Move the potentially referenced deferred decl to the DeferredDeclsToEmit |
| 4429 | // list, and remove it from DeferredDecls (since we don't need it anymore). |
| 4430 | addDeferredDeclToEmit(DDI->second); |
| 4431 | EmittedDeferredDecls[DDI->first] = DDI->second; |
| 4432 | DeferredDecls.erase(DDI); |
| 4433 | } |
| 4434 | |
| 4435 | // Handle things which are present even on external declarations. |
| 4436 | if (D) { |
| 4437 | if (LangOpts.OpenMP && !LangOpts.OpenMPSimd) |
| 4438 | getOpenMPRuntime().registerTargetGlobalVariable(D, GV); |
| 4439 | |
| 4440 | // FIXME: This code is overly simple and should be merged with other global |
| 4441 | // handling. |
| 4442 | GV->setConstant(isTypeConstant(D->getType(), false)); |
| 4443 | |
| 4444 | GV->setAlignment(getContext().getDeclAlign(D).getAsAlign()); |
| 4445 | |
| 4446 | setLinkageForGV(GV, D); |
| 4447 | |
| 4448 | if (D->getTLSKind()) { |
| 4449 | if (D->getTLSKind() == VarDecl::TLS_Dynamic) |
| 4450 | CXXThreadLocals.push_back(D); |
| 4451 | setTLSMode(GV, *D); |
| 4452 | } |
| 4453 | |
| 4454 | setGVProperties(GV, D); |
| 4455 | |
| 4456 | // If required by the ABI, treat declarations of static data members with |
| 4457 | // inline initializers as definitions. |
| 4458 | if (getContext().isMSStaticDataMemberInlineDefinition(D)) { |
| 4459 | EmitGlobalVarDefinition(D); |
| 4460 | } |
| 4461 | |
| 4462 | // Emit section information for extern variables. |
| 4463 | if (D->hasExternalStorage()) { |
| 4464 | if (const SectionAttr *SA = D->getAttr<SectionAttr>()) |
| 4465 | GV->setSection(SA->getName()); |
| 4466 | } |
| 4467 | |
| 4468 | // Handle XCore specific ABI requirements. |
| 4469 | if (getTriple().getArch() == llvm::Triple::xcore && |
| 4470 | D->getLanguageLinkage() == CLanguageLinkage && |
| 4471 | D->getType().isConstant(Context) && |
| 4472 | isExternallyVisible(D->getLinkageAndVisibility().getLinkage())) |
| 4473 | GV->setSection(".cp.rodata"); |
| 4474 | |
| 4475 | // Check if we a have a const declaration with an initializer, we may be |
| 4476 | // able to emit it as available_externally to expose it's value to the |
| 4477 | // optimizer. |
| 4478 | if (Context.getLangOpts().CPlusPlus && GV->hasExternalLinkage() && |
| 4479 | D->getType().isConstQualified() && !GV->hasInitializer() && |
| 4480 | !D->hasDefinition() && D->hasInit() && !D->hasAttr<DLLImportAttr>()) { |
| 4481 | const auto *Record = |
| 4482 | Context.getBaseElementType(D->getType())->getAsCXXRecordDecl(); |
| 4483 | bool HasMutableFields = Record && Record->hasMutableFields(); |
| 4484 | if (!HasMutableFields) { |
| 4485 | const VarDecl *InitDecl; |
| 4486 | const Expr *InitExpr = D->getAnyInitializer(InitDecl); |
| 4487 | if (InitExpr) { |
| 4488 | ConstantEmitter emitter(*this); |
| 4489 | llvm::Constant *Init = emitter.tryEmitForInitializer(*InitDecl); |
| 4490 | if (Init) { |
| 4491 | auto *InitType = Init->getType(); |
| 4492 | if (GV->getValueType() != InitType) { |
| 4493 | // The type of the initializer does not match the definition. |
| 4494 | // This happens when an initializer has a different type from |
| 4495 | // the type of the global (because of padding at the end of a |
| 4496 | // structure for instance). |
| 4497 | GV->setName(StringRef()); |
| 4498 | // Make a new global with the correct type, this is now guaranteed |
| 4499 | // to work. |
| 4500 | auto *NewGV = cast<llvm::GlobalVariable>( |
| 4501 | GetAddrOfGlobalVar(D, InitType, IsForDefinition) |
| 4502 | ->stripPointerCasts()); |
| 4503 | |
| 4504 | // Erase the old global, since it is no longer used. |
| 4505 | GV->eraseFromParent(); |
| 4506 | GV = NewGV; |
| 4507 | } else { |
| 4508 | GV->setInitializer(Init); |
| 4509 | GV->setConstant(true); |
| 4510 | GV->setLinkage(llvm::GlobalValue::AvailableExternallyLinkage); |
| 4511 | } |
| 4512 | emitter.finalize(GV); |
| 4513 | } |
| 4514 | } |
| 4515 | } |
| 4516 | } |
| 4517 | } |
| 4518 | |
| 4519 | if (GV->isDeclaration()) { |
| 4520 | getTargetCodeGenInfo().setTargetAttributes(D, GV, *this); |
| 4521 | // External HIP managed variables needed to be recorded for transformation |
| 4522 | // in both device and host compilations. |
| 4523 | if (getLangOpts().CUDA && D && D->hasAttr<HIPManagedAttr>() && |
| 4524 | D->hasExternalStorage()) |
| 4525 | getCUDARuntime().handleVarRegistration(D, *GV); |
| 4526 | } |
| 4527 | |
| 4528 | if (D) |
| 4529 | SanitizerMD->reportGlobal(GV, *D); |
| 4530 | |
| 4531 | LangAS ExpectedAS = |
| 4532 | D ? D->getType().getAddressSpace() |
| 4533 | : (LangOpts.OpenCL ? LangAS::opencl_global : LangAS::Default); |
| 4534 | assert(getContext().getTargetAddressSpace(ExpectedAS) == TargetAS)(static_cast <bool> (getContext().getTargetAddressSpace (ExpectedAS) == TargetAS) ? void (0) : __assert_fail ("getContext().getTargetAddressSpace(ExpectedAS) == TargetAS" , "clang/lib/CodeGen/CodeGenModule.cpp", 4534, __extension__ __PRETTY_FUNCTION__ )); |
| 4535 | if (DAddrSpace != ExpectedAS) { |
| 4536 | return getTargetCodeGenInfo().performAddrSpaceCast( |
| 4537 | *this, GV, DAddrSpace, ExpectedAS, Ty->getPointerTo(TargetAS)); |
| 4538 | } |
| 4539 | |
| 4540 | return GV; |
| 4541 | } |
| 4542 | |
| 4543 | llvm::Constant * |
| 4544 | CodeGenModule::GetAddrOfGlobal(GlobalDecl GD, ForDefinition_t IsForDefinition) { |
| 4545 | const Decl *D = GD.getDecl(); |
| 4546 | |
| 4547 | if (isa<CXXConstructorDecl>(D) || isa<CXXDestructorDecl>(D)) |
| 4548 | return getAddrOfCXXStructor(GD, /*FnInfo=*/nullptr, /*FnType=*/nullptr, |
| 4549 | /*DontDefer=*/false, IsForDefinition); |
| 4550 | |
| 4551 | if (isa<CXXMethodDecl>(D)) { |
| 4552 | auto FInfo = |
| 4553 | &getTypes().arrangeCXXMethodDeclaration(cast<CXXMethodDecl>(D)); |
| 4554 | auto Ty = getTypes().GetFunctionType(*FInfo); |
| 4555 | return GetAddrOfFunction(GD, Ty, /*ForVTable=*/false, /*DontDefer=*/false, |
| 4556 | IsForDefinition); |
| 4557 | } |
| 4558 | |
| 4559 | if (isa<FunctionDecl>(D)) { |
| 4560 | const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD); |
| 4561 | llvm::FunctionType *Ty = getTypes().GetFunctionType(FI); |
| 4562 | return GetAddrOfFunction(GD, Ty, /*ForVTable=*/false, /*DontDefer=*/false, |
| 4563 | IsForDefinition); |
| 4564 | } |
| 4565 | |
| 4566 | return GetAddrOfGlobalVar(cast<VarDecl>(D), /*Ty=*/nullptr, IsForDefinition); |
| 4567 | } |
| 4568 | |
| 4569 | llvm::GlobalVariable *CodeGenModule::CreateOrReplaceCXXRuntimeVariable( |
| 4570 | StringRef Name, llvm::Type *Ty, llvm::GlobalValue::LinkageTypes Linkage, |
| 4571 | llvm::Align Alignment) { |
| 4572 | llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name); |
| 4573 | llvm::GlobalVariable *OldGV = nullptr; |
| 4574 | |
| 4575 | if (GV) { |
| 4576 | // Check if the variable has the right type. |
| 4577 | if (GV->getValueType() == Ty) |
| 4578 | return GV; |
| 4579 | |
| 4580 | // Because C++ name mangling, the only way we can end up with an already |
| 4581 | // existing global with the same name is if it has been declared extern "C". |
| 4582 | 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!\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 4582, __extension__ __PRETTY_FUNCTION__ )); |
| 4583 | OldGV = GV; |
| 4584 | } |
| 4585 | |
| 4586 | // Create a new variable. |
| 4587 | GV = new llvm::GlobalVariable(getModule(), Ty, /*isConstant=*/true, |
| 4588 | Linkage, nullptr, Name); |
| 4589 | |
| 4590 | if (OldGV) { |
| 4591 | // Replace occurrences of the old variable if needed. |
| 4592 | GV->takeName(OldGV); |
| 4593 | |
| 4594 | if (!OldGV->use_empty()) { |
| 4595 | llvm::Constant *NewPtrForOldDecl = |
| 4596 | llvm::ConstantExpr::getBitCast(GV, OldGV->getType()); |
| 4597 | OldGV->replaceAllUsesWith(NewPtrForOldDecl); |
| 4598 | } |
| 4599 | |
| 4600 | OldGV->eraseFromParent(); |
| 4601 | } |
| 4602 | |
| 4603 | if (supportsCOMDAT() && GV->isWeakForLinker() && |
| 4604 | !GV->hasAvailableExternallyLinkage()) |
| 4605 | GV->setComdat(TheModule.getOrInsertComdat(GV->getName())); |
| 4606 | |
| 4607 | GV->setAlignment(Alignment); |
| 4608 | |
| 4609 | return GV; |
| 4610 | } |
| 4611 | |
| 4612 | /// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the |
| 4613 | /// given global variable. If Ty is non-null and if the global doesn't exist, |
| 4614 | /// then it will be created with the specified type instead of whatever the |
| 4615 | /// normal requested type would be. If IsForDefinition is true, it is guaranteed |
| 4616 | /// that an actual global with type Ty will be returned, not conversion of a |
| 4617 | /// variable with the same mangled name but some other type. |
| 4618 | llvm::Constant *CodeGenModule::GetAddrOfGlobalVar(const VarDecl *D, |
| 4619 | llvm::Type *Ty, |
| 4620 | ForDefinition_t IsForDefinition) { |
| 4621 | 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\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 4621, __extension__ __PRETTY_FUNCTION__ )); |
| 4622 | QualType ASTTy = D->getType(); |
| 4623 | if (!Ty) |
| 4624 | Ty = getTypes().ConvertTypeForMem(ASTTy); |
| 4625 | |
| 4626 | StringRef MangledName = getMangledName(D); |
| 4627 | return GetOrCreateLLVMGlobal(MangledName, Ty, ASTTy.getAddressSpace(), D, |
| 4628 | IsForDefinition); |
| 4629 | } |
| 4630 | |
| 4631 | /// CreateRuntimeVariable - Create a new runtime global variable with the |
| 4632 | /// specified type and name. |
| 4633 | llvm::Constant * |
| 4634 | CodeGenModule::CreateRuntimeVariable(llvm::Type *Ty, |
| 4635 | StringRef Name) { |
| 4636 | LangAS AddrSpace = getContext().getLangOpts().OpenCL ? LangAS::opencl_global |
| 4637 | : LangAS::Default; |
| 4638 | auto *Ret = GetOrCreateLLVMGlobal(Name, Ty, AddrSpace, nullptr); |
| 4639 | setDSOLocal(cast<llvm::GlobalValue>(Ret->stripPointerCasts())); |
| 4640 | return Ret; |
| 4641 | } |
| 4642 | |
| 4643 | void CodeGenModule::EmitTentativeDefinition(const VarDecl *D) { |
| 4644 | 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!\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 4644, __extension__ __PRETTY_FUNCTION__ )); |
| 4645 | |
| 4646 | StringRef MangledName = getMangledName(D); |
| 4647 | llvm::GlobalValue *GV = GetGlobalValue(MangledName); |
| 4648 | |
| 4649 | // We already have a definition, not declaration, with the same mangled name. |
| 4650 | // Emitting of declaration is not required (and actually overwrites emitted |
| 4651 | // definition). |
| 4652 | if (GV && !GV->isDeclaration()) |
| 4653 | return; |
| 4654 | |
| 4655 | // If we have not seen a reference to this variable yet, place it into the |
| 4656 | // deferred declarations table to be emitted if needed later. |
| 4657 | if (!MustBeEmitted(D) && !GV) { |
| 4658 | DeferredDecls[MangledName] = D; |
| 4659 | return; |
| 4660 | } |
| 4661 | |
| 4662 | // The tentative definition is the only definition. |
| 4663 | EmitGlobalVarDefinition(D); |
| 4664 | } |
| 4665 | |
| 4666 | void CodeGenModule::EmitExternalDeclaration(const VarDecl *D) { |
| 4667 | EmitExternalVarDeclaration(D); |
| 4668 | } |
| 4669 | |
| 4670 | CharUnits CodeGenModule::GetTargetTypeStoreSize(llvm::Type *Ty) const { |
| 4671 | return Context.toCharUnitsFromBits( |
| 4672 | getDataLayout().getTypeStoreSizeInBits(Ty)); |
| 4673 | } |
| 4674 | |
| 4675 | LangAS CodeGenModule::GetGlobalVarAddressSpace(const VarDecl *D) { |
| 4676 | if (LangOpts.OpenCL) { |
| 4677 | LangAS AS = D ? D->getType().getAddressSpace() : LangAS::opencl_global; |
| 4678 | assert(AS == LangAS::opencl_global ||(static_cast <bool> (AS == LangAS::opencl_global || AS == LangAS::opencl_global_device || AS == LangAS::opencl_global_host || AS == LangAS::opencl_constant || AS == LangAS::opencl_local || AS >= LangAS::FirstTargetAddressSpace) ? void (0) : __assert_fail ("AS == LangAS::opencl_global || AS == LangAS::opencl_global_device || AS == LangAS::opencl_global_host || AS == LangAS::opencl_constant || AS == LangAS::opencl_local || AS >= LangAS::FirstTargetAddressSpace" , "clang/lib/CodeGen/CodeGenModule.cpp", 4683, __extension__ __PRETTY_FUNCTION__ )) |
| 4679 | AS == LangAS::opencl_global_device ||(static_cast <bool> (AS == LangAS::opencl_global || AS == LangAS::opencl_global_device || AS == LangAS::opencl_global_host || AS == LangAS::opencl_constant || AS == LangAS::opencl_local || AS >= LangAS::FirstTargetAddressSpace) ? void (0) : __assert_fail ("AS == LangAS::opencl_global || AS == LangAS::opencl_global_device || AS == LangAS::opencl_global_host || AS == LangAS::opencl_constant || AS == LangAS::opencl_local || AS >= LangAS::FirstTargetAddressSpace" , "clang/lib/CodeGen/CodeGenModule.cpp", 4683, __extension__ __PRETTY_FUNCTION__ )) |
| 4680 | AS == LangAS::opencl_global_host ||(static_cast <bool> (AS == LangAS::opencl_global || AS == LangAS::opencl_global_device || AS == LangAS::opencl_global_host || AS == LangAS::opencl_constant || AS == LangAS::opencl_local || AS >= LangAS::FirstTargetAddressSpace) ? void (0) : __assert_fail ("AS == LangAS::opencl_global || AS == LangAS::opencl_global_device || AS == LangAS::opencl_global_host || AS == LangAS::opencl_constant || AS == LangAS::opencl_local || AS >= LangAS::FirstTargetAddressSpace" , "clang/lib/CodeGen/CodeGenModule.cpp", 4683, __extension__ __PRETTY_FUNCTION__ )) |
| 4681 | AS == LangAS::opencl_constant ||(static_cast <bool> (AS == LangAS::opencl_global || AS == LangAS::opencl_global_device || AS == LangAS::opencl_global_host || AS == LangAS::opencl_constant || AS == LangAS::opencl_local || AS >= LangAS::FirstTargetAddressSpace) ? void (0) : __assert_fail ("AS == LangAS::opencl_global || AS == LangAS::opencl_global_device || AS == LangAS::opencl_global_host || AS == LangAS::opencl_constant || AS == LangAS::opencl_local || AS >= LangAS::FirstTargetAddressSpace" , "clang/lib/CodeGen/CodeGenModule.cpp", 4683, __extension__ __PRETTY_FUNCTION__ )) |
| 4682 | AS == LangAS::opencl_local ||(static_cast <bool> (AS == LangAS::opencl_global || AS == LangAS::opencl_global_device || AS == LangAS::opencl_global_host || AS == LangAS::opencl_constant || AS == LangAS::opencl_local || AS >= LangAS::FirstTargetAddressSpace) ? void (0) : __assert_fail ("AS == LangAS::opencl_global || AS == LangAS::opencl_global_device || AS == LangAS::opencl_global_host || AS == LangAS::opencl_constant || AS == LangAS::opencl_local || AS >= LangAS::FirstTargetAddressSpace" , "clang/lib/CodeGen/CodeGenModule.cpp", 4683, __extension__ __PRETTY_FUNCTION__ )) |
| 4683 | AS >= LangAS::FirstTargetAddressSpace)(static_cast <bool> (AS == LangAS::opencl_global || AS == LangAS::opencl_global_device || AS == LangAS::opencl_global_host || AS == LangAS::opencl_constant || AS == LangAS::opencl_local || AS >= LangAS::FirstTargetAddressSpace) ? void (0) : __assert_fail ("AS == LangAS::opencl_global || AS == LangAS::opencl_global_device || AS == LangAS::opencl_global_host || AS == LangAS::opencl_constant || AS == LangAS::opencl_local || AS >= LangAS::FirstTargetAddressSpace" , "clang/lib/CodeGen/CodeGenModule.cpp", 4683, __extension__ __PRETTY_FUNCTION__ )); |
| 4684 | return AS; |
| 4685 | } |
| 4686 | |
| 4687 | if (LangOpts.SYCLIsDevice && |
| 4688 | (!D || D->getType().getAddressSpace() == LangAS::Default)) |
| 4689 | return LangAS::sycl_global; |
| 4690 | |
| 4691 | if (LangOpts.CUDA && LangOpts.CUDAIsDevice) { |
| 4692 | if (D) { |
| 4693 | if (D->hasAttr<CUDAConstantAttr>()) |
| 4694 | return LangAS::cuda_constant; |
| 4695 | if (D->hasAttr<CUDASharedAttr>()) |
| 4696 | return LangAS::cuda_shared; |
| 4697 | if (D->hasAttr<CUDADeviceAttr>()) |
| 4698 | return LangAS::cuda_device; |
| 4699 | if (D->getType().isConstQualified()) |
| 4700 | return LangAS::cuda_constant; |
| 4701 | } |
| 4702 | return LangAS::cuda_device; |
| 4703 | } |
| 4704 | |
| 4705 | if (LangOpts.OpenMP) { |
| 4706 | LangAS AS; |
| 4707 | if (OpenMPRuntime->hasAllocateAttributeForGlobalVar(D, AS)) |
| 4708 | return AS; |
| 4709 | } |
| 4710 | return getTargetCodeGenInfo().getGlobalVarAddressSpace(*this, D); |
| 4711 | } |
| 4712 | |
| 4713 | LangAS CodeGenModule::GetGlobalConstantAddressSpace() const { |
| 4714 | // OpenCL v1.2 s6.5.3: a string literal is in the constant address space. |
| 4715 | if (LangOpts.OpenCL) |
| 4716 | return LangAS::opencl_constant; |
| 4717 | if (LangOpts.SYCLIsDevice) |
| 4718 | return LangAS::sycl_global; |
| 4719 | if (LangOpts.HIP && LangOpts.CUDAIsDevice && getTriple().isSPIRV()) |
| 4720 | // For HIPSPV map literals to cuda_device (maps to CrossWorkGroup in SPIR-V) |
| 4721 | // instead of default AS (maps to Generic in SPIR-V). Otherwise, we end up |
| 4722 | // with OpVariable instructions with Generic storage class which is not |
| 4723 | // allowed (SPIR-V V1.6 s3.42.8). Also, mapping literals to SPIR-V |
| 4724 | // UniformConstant storage class is not viable as pointers to it may not be |
| 4725 | // casted to Generic pointers which are used to model HIP's "flat" pointers. |
| 4726 | return LangAS::cuda_device; |
| 4727 | if (auto AS = getTarget().getConstantAddressSpace()) |
| 4728 | return *AS; |
| 4729 | return LangAS::Default; |
| 4730 | } |
| 4731 | |
| 4732 | // In address space agnostic languages, string literals are in default address |
| 4733 | // space in AST. However, certain targets (e.g. amdgcn) request them to be |
| 4734 | // emitted in constant address space in LLVM IR. To be consistent with other |
| 4735 | // parts of AST, string literal global variables in constant address space |
| 4736 | // need to be casted to default address space before being put into address |
| 4737 | // map and referenced by other part of CodeGen. |
| 4738 | // In OpenCL, string literals are in constant address space in AST, therefore |
| 4739 | // they should not be casted to default address space. |
| 4740 | static llvm::Constant * |
| 4741 | castStringLiteralToDefaultAddressSpace(CodeGenModule &CGM, |
| 4742 | llvm::GlobalVariable *GV) { |
| 4743 | llvm::Constant *Cast = GV; |
| 4744 | if (!CGM.getLangOpts().OpenCL) { |
| 4745 | auto AS = CGM.GetGlobalConstantAddressSpace(); |
| 4746 | if (AS != LangAS::Default) |
| 4747 | Cast = CGM.getTargetCodeGenInfo().performAddrSpaceCast( |
| 4748 | CGM, GV, AS, LangAS::Default, |
| 4749 | GV->getValueType()->getPointerTo( |
| 4750 | CGM.getContext().getTargetAddressSpace(LangAS::Default))); |
| 4751 | } |
| 4752 | return Cast; |
| 4753 | } |
| 4754 | |
| 4755 | template<typename SomeDecl> |
| 4756 | void CodeGenModule::MaybeHandleStaticInExternC(const SomeDecl *D, |
| 4757 | llvm::GlobalValue *GV) { |
| 4758 | if (!getLangOpts().CPlusPlus) |
| 4759 | return; |
| 4760 | |
| 4761 | // Must have 'used' attribute, or else inline assembly can't rely on |
| 4762 | // the name existing. |
| 4763 | if (!D->template hasAttr<UsedAttr>()) |
| 4764 | return; |
| 4765 | |
| 4766 | // Must have internal linkage and an ordinary name. |
| 4767 | if (!D->getIdentifier() || D->getFormalLinkage() != InternalLinkage) |
| 4768 | return; |
| 4769 | |
| 4770 | // Must be in an extern "C" context. Entities declared directly within |
| 4771 | // a record are not extern "C" even if the record is in such a context. |
| 4772 | const SomeDecl *First = D->getFirstDecl(); |
| 4773 | if (First->getDeclContext()->isRecord() || !First->isInExternCContext()) |
| 4774 | return; |
| 4775 | |
| 4776 | // OK, this is an internal linkage entity inside an extern "C" linkage |
| 4777 | // specification. Make a note of that so we can give it the "expected" |
| 4778 | // mangled name if nothing else is using that name. |
| 4779 | std::pair<StaticExternCMap::iterator, bool> R = |
| 4780 | StaticExternCValues.insert(std::make_pair(D->getIdentifier(), GV)); |
| 4781 | |
| 4782 | // If we have multiple internal linkage entities with the same name |
| 4783 | // in extern "C" regions, none of them gets that name. |
| 4784 | if (!R.second) |
| 4785 | R.first->second = nullptr; |
| 4786 | } |
| 4787 | |
| 4788 | static bool shouldBeInCOMDAT(CodeGenModule &CGM, const Decl &D) { |
| 4789 | if (!CGM.supportsCOMDAT()) |
| 4790 | return false; |
| 4791 | |
| 4792 | if (D.hasAttr<SelectAnyAttr>()) |
| 4793 | return true; |
| 4794 | |
| 4795 | GVALinkage Linkage; |
| 4796 | if (auto *VD = dyn_cast<VarDecl>(&D)) |
| 4797 | Linkage = CGM.getContext().GetGVALinkageForVariable(VD); |
| 4798 | else |
| 4799 | Linkage = CGM.getContext().GetGVALinkageForFunction(cast<FunctionDecl>(&D)); |
| 4800 | |
| 4801 | switch (Linkage) { |
| 4802 | case GVA_Internal: |
| 4803 | case GVA_AvailableExternally: |
| 4804 | case GVA_StrongExternal: |
| 4805 | return false; |
| 4806 | case GVA_DiscardableODR: |
| 4807 | case GVA_StrongODR: |
| 4808 | return true; |
| 4809 | } |
| 4810 | llvm_unreachable("No such linkage")::llvm::llvm_unreachable_internal("No such linkage", "clang/lib/CodeGen/CodeGenModule.cpp" , 4810); |
| 4811 | } |
| 4812 | |
| 4813 | void CodeGenModule::maybeSetTrivialComdat(const Decl &D, |
| 4814 | llvm::GlobalObject &GO) { |
| 4815 | if (!shouldBeInCOMDAT(*this, D)) |
| 4816 | return; |
| 4817 | GO.setComdat(TheModule.getOrInsertComdat(GO.getName())); |
| 4818 | } |
| 4819 | |
| 4820 | /// Pass IsTentative as true if you want to create a tentative definition. |
| 4821 | void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D, |
| 4822 | bool IsTentative) { |
| 4823 | // OpenCL global variables of sampler type are translated to function calls, |
| 4824 | // therefore no need to be translated. |
| 4825 | QualType ASTTy = D->getType(); |
| 4826 | if (getLangOpts().OpenCL && ASTTy->isSamplerT()) |
| 4827 | return; |
| 4828 | |
| 4829 | // If this is OpenMP device, check if it is legal to emit this global |
| 4830 | // normally. |
| 4831 | if (LangOpts.OpenMPIsDevice && OpenMPRuntime && |
| 4832 | OpenMPRuntime->emitTargetGlobalVariable(D)) |
| 4833 | return; |
| 4834 | |
| 4835 | llvm::TrackingVH<llvm::Constant> Init; |
| 4836 | bool NeedsGlobalCtor = false; |
| 4837 | // Whether the definition of the variable is available externally. |
| 4838 | // If yes, we shouldn't emit the GloablCtor and GlobalDtor for the variable |
| 4839 | // since this is the job for its original source. |
| 4840 | bool IsDefinitionAvailableExternally = |
| 4841 | getContext().GetGVALinkageForVariable(D) == GVA_AvailableExternally; |
| 4842 | bool NeedsGlobalDtor = |
| 4843 | !IsDefinitionAvailableExternally && |
| 4844 | D->needsDestruction(getContext()) == QualType::DK_cxx_destructor; |
| 4845 | |
| 4846 | const VarDecl *InitDecl; |
| 4847 | const Expr *InitExpr = D->getAnyInitializer(InitDecl); |
| 4848 | |
| 4849 | std::optional<ConstantEmitter> emitter; |
| 4850 | |
| 4851 | // CUDA E.2.4.1 "__shared__ variables cannot have an initialization |
| 4852 | // as part of their declaration." Sema has already checked for |
| 4853 | // error cases, so we just need to set Init to UndefValue. |
| 4854 | bool IsCUDASharedVar = |
| 4855 | getLangOpts().CUDAIsDevice && D->hasAttr<CUDASharedAttr>(); |
| 4856 | // Shadows of initialized device-side global variables are also left |
| 4857 | // undefined. |
| 4858 | // Managed Variables should be initialized on both host side and device side. |
| 4859 | bool IsCUDAShadowVar = |
| 4860 | !getLangOpts().CUDAIsDevice && !D->hasAttr<HIPManagedAttr>() && |
| 4861 | (D->hasAttr<CUDAConstantAttr>() || D->hasAttr<CUDADeviceAttr>() || |
| 4862 | D->hasAttr<CUDASharedAttr>()); |
| 4863 | bool IsCUDADeviceShadowVar = |
| 4864 | getLangOpts().CUDAIsDevice && !D->hasAttr<HIPManagedAttr>() && |
| 4865 | (D->getType()->isCUDADeviceBuiltinSurfaceType() || |
| 4866 | D->getType()->isCUDADeviceBuiltinTextureType()); |
| 4867 | if (getLangOpts().CUDA && |
| 4868 | (IsCUDASharedVar || IsCUDAShadowVar || IsCUDADeviceShadowVar)) |
| 4869 | Init = llvm::UndefValue::get(getTypes().ConvertTypeForMem(ASTTy)); |
| 4870 | else if (D->hasAttr<LoaderUninitializedAttr>()) |
| 4871 | Init = llvm::UndefValue::get(getTypes().ConvertTypeForMem(ASTTy)); |
| 4872 | else if (!InitExpr) { |
| 4873 | // This is a tentative definition; tentative definitions are |
| 4874 | // implicitly initialized with { 0 }. |
| 4875 | // |
| 4876 | // Note that tentative definitions are only emitted at the end of |
| 4877 | // a translation unit, so they should never have incomplete |
| 4878 | // type. In addition, EmitTentativeDefinition makes sure that we |
| 4879 | // never attempt to emit a tentative definition if a real one |
| 4880 | // exists. A use may still exists, however, so we still may need |
| 4881 | // to do a RAUW. |
| 4882 | assert(!ASTTy->isIncompleteType() && "Unexpected incomplete type")(static_cast <bool> (!ASTTy->isIncompleteType() && "Unexpected incomplete type") ? void (0) : __assert_fail ("!ASTTy->isIncompleteType() && \"Unexpected incomplete type\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 4882, __extension__ __PRETTY_FUNCTION__ )); |
| 4883 | Init = EmitNullConstant(D->getType()); |
| 4884 | } else { |
| 4885 | initializedGlobalDecl = GlobalDecl(D); |
| 4886 | emitter.emplace(*this); |
| 4887 | llvm::Constant *Initializer = emitter->tryEmitForInitializer(*InitDecl); |
| 4888 | if (!Initializer) { |
| 4889 | QualType T = InitExpr->getType(); |
| 4890 | if (D->getType()->isReferenceType()) |
| 4891 | T = D->getType(); |
| 4892 | |
| 4893 | if (getLangOpts().CPlusPlus) { |
| 4894 | if (InitDecl->hasFlexibleArrayInit(getContext())) |
| 4895 | ErrorUnsupported(D, "flexible array initializer"); |
| 4896 | Init = EmitNullConstant(T); |
| 4897 | |
| 4898 | if (!IsDefinitionAvailableExternally) |
| 4899 | NeedsGlobalCtor = true; |
| 4900 | } else { |
| 4901 | ErrorUnsupported(D, "static initializer"); |
| 4902 | Init = llvm::UndefValue::get(getTypes().ConvertType(T)); |
| 4903 | } |
| 4904 | } else { |
| 4905 | Init = Initializer; |
| 4906 | // We don't need an initializer, so remove the entry for the delayed |
| 4907 | // initializer position (just in case this entry was delayed) if we |
| 4908 | // also don't need to register a destructor. |
| 4909 | if (getLangOpts().CPlusPlus && !NeedsGlobalDtor) |
| 4910 | DelayedCXXInitPosition.erase(D); |
| 4911 | |
| 4912 | #ifndef NDEBUG |
| 4913 | CharUnits VarSize = getContext().getTypeSizeInChars(ASTTy) + |
| 4914 | InitDecl->getFlexibleArrayInitChars(getContext()); |
| 4915 | CharUnits CstSize = CharUnits::fromQuantity( |
| 4916 | getDataLayout().getTypeAllocSize(Init->getType())); |
| 4917 | assert(VarSize == CstSize && "Emitted constant has unexpected size")(static_cast <bool> (VarSize == CstSize && "Emitted constant has unexpected size" ) ? void (0) : __assert_fail ("VarSize == CstSize && \"Emitted constant has unexpected size\"" , "clang/lib/CodeGen/CodeGenModule.cpp", 4917, __extension__ __PRETTY_FUNCTION__ )); |
| 4918 | #endif |
| 4919 | } |
| 4920 | } |
| 4921 | |
| 4922 | llvm::Type* InitType = Init->getType(); |
| 4923 | llvm::Constant *Entry = |
| 4924 | GetAddrOfGlobalVar(D, InitType, ForDefinition_t(!IsTentative)); |
| 4925 | |
| 4926 | // Strip off pointer casts if we got them. |
| 4927 | Entry = Entry->stripPointerCasts(); |
| 4928 | |
| 4929 | // Entry is now either a Function or GlobalVariable. |
| 4930 | auto *GV = dyn_cast<llvm::GlobalVariable>(Entry); |
| 4931 | |
| 4932 | // We have a definition after a declaration with the wrong type. |
| 4933 | // We must make a new GlobalVariable* and update everything that used OldGV |
| 4934 | // (a declaration or tentative definition) with the new GlobalVariable* |
| 4935 | // (which will be a definition). |
| 4936 | // |
| 4937 | // This happens if there is a prototype for a global (e.g. |
| 4938 | // "extern int x[];") and then a definition of a different type (e.g. |
| 4939 | // "int x[10];"). This also happens when an initializer has a different type |
| 4940 | // from the type of the global (this happens with unions). |
| 4941 | if (!GV || GV->getValueType() != InitType || |
| 4942 | GV->getType()->getAddressSpace() != |
| 4943 | getContext().getTargetAddressSpace(GetGlobalVarAddressSpace(D))) { |
| 4944 | |
| 4945 | // Move the old entry aside so that we'll create a new one. |
| 4946 | Entry->setName(StringRef()); |
| 4947 | |
| 4948 | // Make a new global with the correct type, this is now guaranteed to work. |
| 4949 | GV = cast<llvm::GlobalVariable>( |
| 4950 | GetAddrOfGlobalVar(D, InitType, ForDefinition_t(!IsTentative)) |
| 4951 | ->stripPointerCasts()); |
| 4952 | |
| 4953 | // Replace all uses of the old global with the new global |
| 4954 | llvm::Constant *NewPtrForOldDecl = |
| 4955 | llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(GV, |
| 4956 | Entry->getType()); |
| 4957 | Entry->replaceAllUsesWith(NewPtrForOldDecl); |
| 4958 | |
| 4959 | // Erase the old global, since it is no longer used. |
| 4960 | cast<llvm::GlobalValue>(Entry)->eraseFromParent(); |
| 4961 | } |
| 4962 | |
| 4963 | MaybeHandleStaticInExternC(D, GV); |
| 4964 | |
| 4965 | if (D->hasAttr<AnnotateAttr>()) |
| 4966 | AddGlobalAnnotations(D, GV); |
| 4967 | |
| 4968 | // Set the llvm linkage type as appropriate. |
| 4969 | llvm::GlobalValue::LinkageTypes Linkage = |
| 4970 | getLLVMLinkageVarDefinition(D, GV->isConstant()); |
| 4971 | |
| 4972 | // CUDA B.2.1 "The __device__ qualifier declares a variable that resides on |
| 4973 | // the device. [...]" |
| 4974 | // CUDA B.2.2 "The __constant__ qualifier, optionally used together with |
| 4975 | // __device__, declares a variable that: [...] |
| 4976 | // Is accessible from all the threads within the grid and from the host |
| 4977 | // through the runtime library (cudaGetSymbolAddress() / cudaGetSymbolSize() |
| 4978 | // / cudaMemcpyToSymbol() / cudaMemcpyFromSymbol())." |
| 4979 | if (GV && LangOpts.CUDA) { |
| 4980 | if (LangOpts.CUDAIsDevice) { |
| 4981 | if (Linkage != llvm::GlobalValue::InternalLinkage && |
| 4982 | (D->hasAttr<CUDADeviceAttr>() || D->hasAttr<CUDAConstantAttr>() || |
| 4983 | D->getType()->isCUDADeviceBuiltinSurfaceType() || |
| 4984 | D->getType()->isCUDADeviceBuiltinTextureType())) |
| 4985 | GV->setExternallyInitialized(true); |
| 4986 | } else { |
| 4987 | getCUDARuntime().internalizeDeviceSideVar(D, Linkage); |
| 4988 | } |
| 4989 | getCUDARuntime().handleVarRegistration(D, *GV); |
| 4990 | } |
| 4991 | |
| 4992 | GV->setInitializer(Init); |
| 4993 | if (emitter) |
| 4994 | emitter->finalize(GV); |
| 4995 | |
| 4996 | // If it is safe to mark the global 'constant', do so now. |
| 4997 | GV->setConstant(!NeedsGlobalCtor && !NeedsGlobalDtor && |
| 4998 | isTypeConstant(D->getType(), true)); |
| 4999 | |
| 5000 | // If it is in a read-only section, mark it 'constant'. |
| 5001 | if (const SectionAttr *SA = D->getAttr<SectionAttr>()) { |
| 5002 | const ASTContext::SectionInfo &SI = Context.SectionInfos[SA->getName()]; |
| 5003 | if ((SI.SectionFlags & ASTContext::PSF_Write) == 0) |
| 5004 | GV->setConstant(true); |
| 5005 | } |
| 5006 | |
| 5007 | CharUnits AlignVal = getContext().getDeclAlign(D); |
| 5008 | // Check for alignment specifed in an 'omp allocate' directive. |
| 5009 | if (std::optional<CharUnits> AlignValFromAllocate = |
| 5010 | getOMPAllocateAlignment(D)) |
| 5011 | AlignVal = *AlignValFromAllocate; |
| 5012 | GV->setAlignment(AlignVal.getAsAlign()); |
| 5013 | |
| 5014 | // On Darwin, unlike other Itanium C++ ABI platforms, the thread-wrapper |
| 5015 | // function is only defined alongside the variable, not also alongside |
| 5016 | // callers. Normally, all accesses to a thread_local go through the |
| 5017 | // thread-wrapper in order to ensure initialization has occurred, underlying |
| 5018 | // variable will never be used other than the thread-wrapper, so it can be |
| 5019 | // converted to internal linkage. |
| 5020 | // |
| 5021 | // However, if the variable has the 'constinit' attribute, it _can_ be |
| 5022 | // referenced directly, without calling the thread-wrapper, so the linkage |
| 5023 | // must not be changed. |
| 5024 | // |
| 5025 | // Additionally, if the variable isn't plain external linkage, e.g. if it's |
| 5026 | // weak or linkonce, the de-duplication semantics are important to preserve, |
| 5027 | // so we don't change the linkage. |
| 5028 | if (D->getTLSKind() == VarDecl::TLS_Dynamic && |
| 5029 | Linkage == llvm::GlobalValue::ExternalLinkage && |
| 5030 | Context.getTargetInfo().getTriple().isOSDarwin() && |
| 5031 | !D->hasAttr<ConstInitAttr>()) |
| 5032 | Linkage = llvm::GlobalValue::InternalLinkage; |
| 5033 | |
| 5034 | GV->setLinkage(Linkage); |
| 5035 | if (D->hasAttr<DLLImportAttr>()) |
| 5036 | GV->setDLLStorageClass(llvm::GlobalVariable::DLLImportStorageClass); |
| 5037 | else if (D->hasAttr<DLLExportAttr>()) |
| 5038 | GV->setDLLStorageClass(llvm::GlobalVariable::DLLExportStorageClass); |
| 5039 | else |
| 5040 | GV->setDLLStorageClass(llvm::GlobalVariable::DefaultStorageClass); |
| 5041 | |
| 5042 | if (Linkage == llvm::GlobalVariable::CommonLinkage) { |
| 5043 | // common vars aren't constant even if declared const. |
| 5044 | GV->setConstant(false); |
| 5045 | // Tentative definition of global variables may be initialized with |
| 5046 | // non-zero null pointers. In this case they should have weak linkage |
| 5047 | // since common linkage must have zero initializer and must not have |
| 5048 | // explicit section therefore cannot have non-zero initial value. |
| 5049 | if (!GV->getInitializer()->isNullValue()) |
| 5050 | GV->setLinkage(llvm::GlobalVariable::WeakAnyLinkage); |
| 5051 | } |
| 5052 | |
| 5053 | setNonAliasAttributes(D, GV); |
| 5054 | |
| 5055 | if (D->getTLSKind() && !GV->isThreadLocal()) { |
| 5056 | if (D->getTLSKind() == VarDecl::TLS_Dynamic) |
| 5057 | CXXThreadLocals.push_back(D); |
| 5058 | setTLSMode(GV, *D); |
| 5059 | } |
| 5060 | |
| 5061 | maybeSetTrivialComdat(*D, *GV); |
| 5062 | |
| 5063 | // Emit the initializer function if necessary. |
| 5064 | if (NeedsGlobalCtor || NeedsGlobalDtor) |
| 5065 | EmitCXXGlobalVarDeclInitFunc(D, GV, NeedsGlobalCtor); |
| 5066 | |
| 5067 | SanitizerMD->reportGlobal(GV, *D, NeedsGlobalCtor); |
| 5068 | |
| 5069 | // Emit global variable debug information. |
| 5070 | if (CGDebugInfo *DI = getModuleDebugInfo()) |
| 5071 | if (getCodeGenOpts().hasReducedDebugInfo()) |
| 5072 | DI->EmitGlobalVariable(GV, D); |
| 5073 | } |
| 5074 | |
| 5075 | void CodeGenModule::EmitExternalVarDeclaration(const VarDecl *D) { |
| 5076 | if (CGDebugInfo *DI = getModuleDebugInfo()) |
| 5077 | if (getCodeGenOpts().hasReducedDebugInfo()) { |
| 5078 | QualType ASTTy = D->getType(); |
| 5079 | llvm::Type *Ty = getTypes().ConvertTypeForMem(D->getType()); |
| 5080 | llvm::Constant *GV = |
| 5081 | GetOrCreateLLVMGlobal(D->getName(), Ty, ASTTy.getAddressSpace(), D); |
| 5082 | DI->EmitExternalVariable( |
| 5083 | cast<llvm::GlobalVariable>(GV->stripPointerCasts()), D); |
| 5084 | } |
| 5085 | } |
| 5086 | |
| 5087 | static bool isVarDeclStrongDefinition(const ASTContext &Context, |
| 5088 | CodeGenModule &CGM, const VarDecl *D, |
| 5089 | bool NoCommon) { |
| 5090 | // Don't give variables common linkage if -fno-common was specified unless it |
| 5091 | // was overridden by a NoCommon attribute. |
| 5092 | if ((NoCommon || D->hasAttr<NoCommonAttr>()) && !D->hasAttr<CommonAttr>()) |
| 5093 | return true; |
| 5094 | |
| 5095 | // C11 6.9.2/2: |
| 5096 | // A declaration of an identifier for an object that has file scope without |
| 5097 | // an initializer, and without a storage-class specifier or with the |
| 5098 | // storage-class specifier static, constitutes a tentative definition. |
| 5099 | if (D->getInit() || D->hasExternalStorage()) |
| 5100 | return true; |
| 5101 | |
| 5102 | // A variable cannot be both common and exist in a section. |
| 5103 | if (D->hasAttr<SectionAttr>()) |
| 5104 | return true; |
| 5105 | |
| 5106 | // A variable cannot be both common and exist in a section. |
| 5107 | // We don't try to determine which is the right section in the front-end. |
| 5108 | // If no specialized section name is applicable, it will resort to default. |
| 5109 | if (D->hasAttr<PragmaClangBSSSectionAttr>() || |
| 5110 | D->hasAttr<PragmaClangDataSectionAttr>() || |
| 5111 | D->hasAttr<PragmaClangRelroSectionAttr>() || |
| 5112 | D->hasAttr<PragmaClangRodataSectionAttr>()) |
| 5113 | return true; |
| 5114 | |
| 5115 | // Thread local vars aren't considered common linkage. |
| 5116 | if (D->getTLSKind()) |
| 5117 | return true; |
| 5118 | |
| 5119 | // Tentative definitions marked with WeakImportAttr are true definitions. |
| 5120 | if (D->hasAttr<WeakImportAttr>()) |
| 5121 | return true; |
| 5122 | |
| 5123 | // A variable cannot be both common and exist in a comdat. |
| 5124 | if (shouldBeInCOMDAT(CGM, *D)) |
| 5125 | return true; |
| 5126 | |
| 5127 | // Declarations with a required alignment do not have common linkage in MSVC |
| 5128 | // mode. |
| 5129 | if (Context.getTargetInfo().getCXXABI().isMicrosoft()) { |
| 5130 | if (D->hasAttr<AlignedAttr>()) |
| 5131 | return true; |
| 5132 | QualType VarType = D->getType(); |
| 5133 | if (Context.isAlignmentRequired(VarType)) |
| 5134 | return true; |
| 5135 | |
| 5136 | if (const auto *RT = VarType->getAs<RecordType>()) { |
| 5137 | const RecordDecl *RD = RT->getDecl(); |
| 5138 | for (const FieldDecl *FD : RD->fields()) { |
| 5139 | if (FD->isBitField()) |
| 5140 | continue; |
| 5141 | if (FD->hasAttr<AlignedAttr>()) |
| 5142 | return true; |
| 5143 | if (Context.isAlignmentRequired(FD->getType())) |
| 5144 | return true; |
| 5145 | } |
| 5146 | } |
| 5147 | } |
| 5148 | |
| 5149 | // Microsoft's link.exe doesn't support alignments greater than 32 bytes for |
| 5150 | // common symbols, so symbols with greater alignment requirements cannot be |
| 5151 | // common. |
| 5152 | // Other COFF linkers (ld.bfd and LLD) support arbitrary power-of-two |
| 5153 | // alignments for common symbols via the aligncomm directive, so this |
| 5154 | // restriction only applies to MSVC environments. |
| 5155 | if (Context.getTargetInfo().getTriple().isKnownWindowsMSVCEnvironment() && |
| 5156 | Context.getTypeAlignIfKnown(D->getType()) > |
| 5157 | Context.toBits(CharUnits::fromQuantity(32))) |
| 5158 | return true; |
| 5159 | |
| 5160 | return false; |
| 5161 | } |
| 5162 | |
| 5163 | llvm::GlobalValue::LinkageTypes CodeGenModule::getLLVMLinkageForDeclarator( |
| 5164 | const DeclaratorDecl *D, GVALinkage Linkage, bool IsConstantVariable) { |
| 5165 | if (Linkage == GVA_Internal) |
| 5166 | return llvm::Function::InternalLinkage; |
| 5167 | |
| 5168 | if (D->hasAttr<WeakAttr>()) |
| 5169 | return llvm::GlobalVariable::WeakAnyLinkage; |
| 5170 | |
| 5171 | if (const auto *FD = D->getAsFunction()) |
| 5172 | if (FD->isMultiVersion() && Linkage == GVA_AvailableExternally) |
| 5173 | return llvm::GlobalVariable::LinkOnceAnyLinkage; |
| 5174 | |
| 5175 | // We are guaranteed to have a strong definition somewhere else, |
| 5176 | // so we can use available_externally linkage. |
| 5177 | if (Linkage == GVA_AvailableExternally) |
| 5178 | return llvm::GlobalValue::AvailableExternallyLinkage; |
| 5179 | |
| 5180 | // Note that Apple's kernel linker doesn't support symbol |
| 5181 | // coalescing, so we need to avoid linkonce and weak linkages there. |
| 5182 | // Normally, this means we just map to internal, but for explicit |
| 5183 | // instantiations we'll map to external. |
| 5184 | |
| 5185 | // In C++, the compiler has to emit a definition in every translation unit |
| 5186 | // that references the function. We should use linkonce_odr because |
| 5187 | // a) if all references in this translation unit are optimized away, we |
| 5188 | // don't need to codegen it. b) if the function persists, it needs to be |
| 5189 | // merged with other definitions. c) C++ has the ODR, so we know the |
| 5190 | // definition is dependable. |
| 5191 | if (Linkage == GVA_DiscardableODR) |
| 5192 | return !Context.getLangOpts().AppleKext ? llvm::Function::LinkOnceODRLinkage |
| 5193 | : llvm::Function::InternalLinkage; |
| 5194 | |
| 5195 | // An explicit instantiation of a template has weak linkage, since |
| 5196 | // explicit instantiations can occur in multiple translation units |
| 5197 | // and must all be equivalent. However, we are not allowed to |
| 5198 | // throw away these explicit instantiations. |
| 5199 | // |
| 5200 | // CUDA/HIP: For -fno-gpu-rdc case, device code is limited to one TU, |
| 5201 | // so say that CUDA templates are either external (for kernels) or internal. |
| 5202 | // This lets llvm perform aggressive inter-procedural optimizations. For |
| 5203 | // -fgpu-rdc case, device function calls across multiple TU's are allowed, |
| 5204 | // therefore we need to follow the normal linkage paradigm. |
| 5205 | if (Linkage == GVA_StrongODR) { |
| 5206 | if (getLangOpts().AppleKext) |
| 5207 | return llvm::Function::ExternalLinkage; |
| 5208 | if (getLangOpts().CUDA && getLangOpts().CUDAIsDevice && |
| 5209 | !getLangOpts().GPURelocatableDeviceCode) |
| 5210 | return D->hasAttr<CUDAGlobalAttr>() ? llvm::Function::ExternalLinkage |
| 5211 | : llvm::Function::InternalLinkage; |
| 5212 | return llvm::Function::WeakODRLinkage; |
| 5213 | } |
| 5214 | |
| 5215 | // C++ doesn't have tentative definitions and thus cannot have common |
| 5216 | // linkage. |
| 5217 | if (!getLangOpts().CPlusPlus && isa<VarDecl>(D) && |
| 5218 | !isVarDeclStrongDefinition(Context, *this, cast<VarDecl>(D), |
| 5219 | CodeGenOpts.NoCommon)) |
| 5220 | return llvm::GlobalVariable::CommonLinkage; |
| 5221 | |
| 5222 | // selectany symbols are externally visible, so use weak instead of |
| 5223 | // linkonce. MSVC optimizes away references to const selectany globals, so |
| 5224 | // all definitions should be the same and ODR linkage should be used. |
| 5225 | // http://msdn.microsoft.com/en-us/library/5tkz6s71.aspx |
| 5226 | if (D->hasAttr<SelectAnyAttr>()) |
| 5227 | return llvm::GlobalVariable::WeakODRLinkage; |
| 5228 | |
| 5229 | // Otherwise, we have strong external linkage. |
| 5230 | assert(Linkage == GVA_StrongExternal)(static_cast <bool> (Linkage == GVA_StrongExternal) ? void (0) : __assert_fail ("Linkage == GVA_StrongExternal", "clang/lib/CodeGen/CodeGenModule.cpp" , 5230, __extension__ __PRETTY_FUNCTION__)); |
| 5231 | return llvm::GlobalVariable::ExternalLinkage; |
| 5232 | } |
| 5233 | |
| 5234 | llvm::GlobalValue::LinkageTypes CodeGenModule::getLLVMLinkageVarDefinition( |
| 5235 | const VarDecl *VD, bool IsConstant) { |
| 5236 | GVALinkage Linkage = getContext().GetGVALinkageForVariable(VD); |
| 5237 | return getLLVMLinkageForDeclarator(VD, Linkage, IsConstant); |
| 5238 | } |
| 5239 | |
| 5240 | /// Replace the uses of a function that was declared with a non-proto type. |
| 5241 | /// We want to silently drop extra arguments from call sites |
| 5242 | static void replaceUsesOfNonProtoConstant(llvm::Constant *old, |
| 5243 | llvm::Function *newFn) { |
| 5244 | // Fast path. |
| 5245 | if (old->use_empty()) return; |
| 5246 | |
| 5247 | llvm::Type *newRetTy = newFn->getReturnType(); |
| 5248 | SmallVector<llvm::Value*, 4> newArgs; |
| 5249 | |
| 5250 | for (llvm::Value::use_iterator ui = old->use_begin(), ue = old->use_end(); |
| 5251 | ui != ue; ) { |
| 5252 | llvm::Value::use_iterator use = ui++; // Increment before the use is erased. |
| 5253 | llvm::User *user = use->getUser(); |
| 5254 | |
| 5255 | // Recognize and replace uses of bitcasts. Most calls to |
| 5256 | // unprototyped functions will use bitcasts. |
| 5257 | if (auto *bitcast = dyn_cast<llvm::ConstantExpr>(user)) { |
| 5258 | if (bitcast->getOpcode() == llvm::Instruction::BitCast) |
| 5259 | replaceUsesOfNonProtoConstant(bitcast, newFn); |
| 5260 | continue; |
| 5261 | } |
| 5262 | |
| 5263 | // Recognize calls to the function. |
| 5264 | llvm::CallBase *callSite = dyn_cast<llvm::CallBase>(user); |
| 5265 | if (!callSite) continue; |
| 5266 | if (!callSite->isCallee(&*use)) |
| 5267 | continue; |
| 5268 | |
| 5269 | // If the return types don't match exactly, then we can't |
| 5270 | // transform this call unless it's dead. |
| 5271 | if (callSite->getType() != newRetTy && !callSite->use_empty()) |
| 5272 | continue; |
| 5273 | |
| 5274 | // Get the call site's attribute list. |
| 5275 | SmallVector<llvm::AttributeSet, 8> newArgAttrs; |
| 5276 | llvm::AttributeList oldAttrs = callSite->getAttributes(); |
| 5277 | |
| 5278 | // If the function was passed too few arguments, don't transform. |
| 5279 | unsigned newNumArgs = newFn->arg_size(); |
| 5280 | if (callSite->arg_size() < newNumArgs) |
| 5281 | continue; |
| 5282 | |
| 5283 | // If extra arguments were passed, we silently drop them. |
| 5284 | // If any of the types mismatch, we don't transform. |
| 5285 | unsigned argNo = 0; |
| 5286 | bool dontTransform = false; |
| 5287 | for (llvm::Argument &A : newFn->args()) { |
| 5288 | if (callSite->getArgOperand(argNo)->getType() != A.getType()) { |
| 5289 | dontTransform = true; |
| 5290 | break; |
| 5291 | } |
| 5292 | |
| 5293 | // Add any parameter attributes. |
| 5294 | newArgAttrs.push_back(oldAttrs.getParamAttrs(argNo)); |
| 5295 | argNo++; |
| 5296 | } |
| 5297 | if (dontTransform) |
| 5298 | continue; |
| 5299 | |
| 5300 | // Okay, we can transform this. Create the new call instruction and copy |
| 5301 | // over the required information. |
| 5302 | newArgs.append(callSite->arg_begin(), callSite->arg_begin() + argNo); |
| 5303 | |
| 5304 | // Copy over any operand bundles. |
| 5305 | SmallVector<llvm::OperandBundleDef, 1> newBundles; |
| 5306 | callSite->getOperandBundlesAsDefs(newBundles); |
| 5307 | |
| 5308 | llvm::CallBase *newCall; |
| 5309 | if (isa<llvm::CallInst>(callSite)) { |
| 5310 | newCall = |
| 5311 | llvm::CallInst::Create(newFn, newArgs, newBundles, "", callSite); |
| 5312 | } else { |
| 5313 | auto *oldInvoke = cast<llvm::InvokeInst>(callSite); |
| 5314 | newCall = llvm::InvokeInst::Create(newFn, oldInvoke->getNormalDest(), |
| 5315 | oldInvoke->getUnwindDest(), newArgs, |
| 5316 | newBundles, "", callSite); |
| 5317 | } |
| 5318 | newArgs.clear(); // for the next iteration |
| 5319 | |
| 5320 | if (!newCall->getType()->isVoidTy()) |
| 5321 | newCall->takeName(callSite); |
| 5322 | newCall->setAttributes( |
| 5323 | llvm::AttributeList::get(newFn->getContext(), oldAttrs.getFnAttrs(), |
| 5324 | oldAttrs.getRetAttrs(), newArgAttrs)); |
| 5325 | newCall->setCallingConv(callSite->getCallingConv()); |
| 5326 | |
| 5327 | // Finally, remove the old call, replacing any uses with the new one. |
| 5328 | if (!callSite->use_empty()) |
| 5329 | callSite->replaceAllUsesWith(newCall); |
| 5330 | |
| 5331 | // Copy debug location attached to CI. |
| 5332 | if (callSite->getDebugLoc()) |
| 5333 | newCall->setDebugLoc(callSite->getDebugLoc()); |
| 5334 | |
| 5335 | callSite->eraseFromParent(); |
| 5336 | } |
| 5337 | } |
| 5338 | |
| 5339 | /// ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we |
| 5340 | /// implement a function with no prototype, e.g. "int foo() {}". If there are |
| 5341 | /// existing call uses of the old function in the module, this adjusts them to |
| 5342 | /// call the new function directly. |
| 5343 | /// |
| 5344 | /// This is not just a cleanup: the always_inline pass requires direct calls to |
| 5345 | /// functions to be able to inline them. If there is a bitcast in the way, it |
| 5346 | /// won't inline them. Instcombine normally deletes these calls, but it isn't |
| 5347 | /// run at -O0. |
| 5348 | static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old, |
| 5349 | llvm::Function *NewFn) { |
| 5350 | // If we're redefining a global as a function, don't transform it. |
| 5351 | if (!isa<llvm::Function>(Old)) return; |
| 5352 | |
| 5353 | replaceUsesOfNonProtoConstant(Old, NewFn); |
| 5354 | } |
| 5355 | |
| 5356 | void CodeGenModule::HandleCXXStaticMemberVarInstantiation(VarDecl *VD) { |
| 5357 | auto DK = VD->isThisDeclarationADefinition(); |
| 5358 | if (DK == VarDecl::Definition && VD->hasAttr<DLLImportAttr>()) |
| 5359 | return; |
| 5360 | |
| 5361 | TemplateSpecializationKind TSK = VD->getTemplateSpecializationKind(); |
| 5362 | // If we have a definition, this might be a deferred decl. If the |
| 5363 | // instantiation is explicit, make sure we emit it at the end. |
| 5364 | if (VD->getDefinition() && TSK == TSK_ExplicitInstantiationDefinition) |
| 5365 | GetAddrOfGlobalVar(VD); |
| 5366 | |
| 5367 | EmitTopLevelDecl(VD); |
| 5368 | } |
| 5369 | |
| 5370 | void CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD, |
| 5371 | llvm::GlobalValue *GV) { |
| 5372 | const auto *D = cast<FunctionDecl>(GD.getDecl()); |
| 5373 | |
| 5374 | // Compute the function info and LLVM type. |
| 5375 | const CGFunctionInfo &FI = getTypes().arrangeGlobalDeclaration(GD); |
| 5376 | llvm::FunctionType *Ty = getTypes().GetFunctionType(FI); |
| 5377 | |
| 5378 | // Get or create the prototype for the function. |
| 5379 | if (!GV || (GV->getValueType() != Ty)) |
| 5380 | GV = cast<llvm::GlobalValue>(GetAddrOfFunction(GD, Ty, /*ForVTable=*/false, |
| 5381 | /*DontDefer=*/true, |
| 5382 | ForDefinition)); |
| 5383 | |
| 5384 | // Already emitted. |
| 5385 | if (!GV->isDeclaration()) |
| 5386 | return; |
| 5387 | |
| 5388 | // We need to set linkage and visibility on the function before |
| 5389 | // generating code for it because various parts of IR generation |
| 5390 | // want to propagate this information down (e.g. to local static |
| 5391 | // declarations). |
| 5392 | auto *Fn = cast<llvm::Function>(GV); |
| 5393 | setFunctionLinkage(GD, Fn); |
| 5394 | |
| 5395 | // FIXME: this is redundant with part of setFunctionDefinitionAttributes |
| 5396 | setGVProperties(Fn, GD); |
| 5397 | |
| 5398 | MaybeHandleStaticInExternC(D, Fn); |
| 5399 | |
| 5400 | maybeSetTrivialComdat(*D, *Fn); |
| 5401 | |
| 5402 | // Set CodeGen attributes that represent floating point environment. |
| 5403 | setLLVMFunctionFEnvAttributes(D, Fn); |
| 5404 | |
| 5405 | CodeGenFunction(*this).GenerateCode(GD, Fn, FI); |
| 5406 | |
| 5407 | setNonAliasAttributes(GD, Fn); |
| 5408 | SetLLVMFunctionAttributesForDefinition(D, Fn); |
| 5409 | |
| 5410 | if (const ConstructorAttr *CA = D->getAttr<ConstructorAttr>()) |
| 5411 | AddGlobalCtor(Fn, CA->getPriority()); |
| 5412 | if (const DestructorAttr *DA = D->getAttr<DestructorAttr>()) |
| 5413 | AddGlobalDtor(Fn, DA->getPriority(), true); |
| 5414 | if (D->hasAttr<AnnotateAttr>()) |
| 5415 | AddGlobalAnnotations(D, Fn); |
| 5416 | } |
| 5417 | |
| 5418 | void CodeGenModule::EmitAliasDefinition(GlobalDecl GD) { |
| 5419 | const auto *D = cast<ValueDecl>(GD.getDecl()); |
| 5420 | const AliasAttr *AA = D->getAttr<AliasAttr>(); |
| 5421 | assert(AA && "Not an alias?")(static_cast <bool> (AA && "Not an alias?") ? void (0) : __assert_fail ("AA && \"Not an alias?\"", "clang/lib/CodeGen/CodeGenModule.cpp" , 5421, __extension__ __PRETTY_FUNCTION__)); |
| 5422 | |
| 5423 | StringRef MangledName = getMangledName(GD); |
| 5424 | |
| 5425 | if (AA->getAliasee() == MangledName) { |
| 5426 | Diags.Report(AA->getLocation(), diag::err_cyclic_alias) << 0; |
| 5427 | return; |
| 5428 | } |
| 5429 | |
| 5430 | // If there is a definition in the module, then it wins over the alias. |
| 5431 | // This is dubious, but allow it to be safe. Just ignore the alias. |
| 5432 | llvm::GlobalValue *Entry = GetGlobalValue(MangledName); |
| 5433 | if (Entry && !Entry->isDeclaration()) |
| 5434 | return; |
| 5435 | |
| 5436 | Aliases.push_back(GD); |
| 5437 | |
| 5438 | llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType()); |
| 5439 | |
| 5440 | // Create a reference to the named value. This ensures that it is emitted |
| 5441 | // if a deferred decl. |
| 5442 | llvm::Constant *Aliasee; |
| 5443 | llvm::GlobalValue::LinkageTypes LT; |
| 5444 | if (isa<llvm::FunctionType>(DeclTy)) { |
| 5445 | Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy, GD, |
| 5446 | /*ForVTable=*/false); |
| 5447 | LT = getFunctionLinkage(GD); |
| 5448 | } else { |
| 5449 | Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(), DeclTy, LangAS::Default, |
| 5450 | /*D=*/nullptr); |
| 5451 | if (const auto *VD = dyn_cast<VarDecl>(GD.getDecl())) |
| 5452 | LT = getLLVMLinkageVarDefinition(VD, D->getType().isConstQualified()); |
| 5453 | else |
| 5454 | LT = getFunctionLinkage(GD); |
| 5455 | } |
| 5456 | |
| 5457 | // Create the new alias itself, but don't set a name yet. |
| 5458 | unsigned AS = Aliasee->getType()->getPointerAddressSpace(); |
| 5459 | auto *GA = |
| 5460 | llvm::GlobalAlias::create(DeclTy, AS, LT, "", Aliasee, &getModule()); |
| 5461 | |
| 5462 | if (Entry) { |
| 5463 | if (GA->getAliasee() == Entry) { |
| 5464 | Diags.Report(AA->getLocation(), diag::err_cyclic_alias) << 0; |
| 5465 | return; |
| 5466 | } |
| 5467 | |
| 5468 | assert(Entry->isDeclaration())(static_cast <bool> (Entry->isDeclaration()) ? void ( 0) : __assert_fail ("Entry->isDeclaration()", "clang/lib/CodeGen/CodeGenModule.cpp" , 5468, __extension__ __PRETTY_FUNCTION__)); |
| 5469 | |
| 5470 | // If there is a declaration in the module, then we had an extern followed |
| 5471 | // by the alias, as in: |
| 5472 | // extern int test6(); |
| 5473 | // ... |
| 5474 | // int test6() __attribute__((alias("test7"))); |
| 5475 | // |
| 5476 | // Remove it and replace uses of it with the alias. |
| 5477 | GA->takeName(Entry); |
| 5478 | |
| 5479 | Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GA, |
| 5480 | Entry->getType())); |
| 5481 | Entry->eraseFromParent(); |
| 5482 | } else { |
| 5483 | GA->setName(MangledName); |
| 5484 | } |
| 5485 | |
| 5486 | // Set attributes which are particular to an alias; this is a |
| 5487 | // specialization of the attributes which may be set on a global |
| 5488 | // variable/function. |
| 5489 | if (D->hasAttr<WeakAttr>() || D->hasAttr<WeakRefAttr>() || |
| 5490 | D->isWeakImported()) { |
| 5491 | GA->setLinkage(llvm::Function::WeakAnyLinkage); |
| 5492 | } |
| 5493 | |
| 5494 | if (const auto *VD = dyn_cast<VarDecl>(D)) |
| 5495 | if (VD->getTLSKind()) |
| 5496 | setTLSMode(GA, *VD); |
| 5497 | |
| 5498 | SetCommonAttributes(GD, GA); |
| 5499 | |
| 5500 | // Emit global alias debug information. |
| 5501 | if (isa<VarDecl>(D)) |
| 5502 | if (CGDebugInfo *DI = getModuleDebugInfo()) |
| 5503 | DI->EmitGlobalAlias(cast<llvm::GlobalValue>(GA->getAliasee()->stripPointerCasts()), GD); |
| 5504 | } |
| 5505 | |
| 5506 | void CodeGenModule::emitIFuncDefinition(GlobalDecl GD) { |
| 5507 | const auto *D = cast<ValueDecl>(GD.getDecl()); |
| 5508 | const IFuncAttr *IFA = D->getAttr<IFuncAttr>(); |
| 5509 | assert(IFA && "Not an ifunc?")(static_cast <bool> (IFA && "Not an ifunc?") ? void (0) : __assert_fail ("IFA && \"Not an ifunc?\"", "clang/lib/CodeGen/CodeGenModule.cpp" , 5509, __extension__ __PRETTY_FUNCTION__)); |
| 5510 | |
| 5511 | StringRef MangledName = getMangledName(GD); |
| 5512 | |
| 5513 | if (IFA->getResolver() == MangledName) { |
| 5514 | Diags.Report(IFA->getLocation(), diag::err_cyclic_alias) << 1; |
| 5515 | return; |
| 5516 | } |
| 5517 | |
| 5518 | // Report an error if some definition overrides ifunc. |
| 5519 | llvm::GlobalValue *Entry = GetGlobalValue(MangledName); |
| 5520 | if (Entry && !Entry->isDeclaration()) { |
| 5521 | GlobalDecl OtherGD; |
| 5522 | if (lookupRepresentativeDecl(MangledName, OtherGD) && |
| 5523 | DiagnosedConflictingDefinitions.insert(GD).second) { |
| 5524 | Diags.Report(D->getLocation(), diag::err_duplicate_mangled_name) |
| 5525 | << MangledName; |
| 5526 | Diags.Report(OtherGD.getDecl()->getLocation(), |
| 5527 | diag::note_previous_definition); |
| 5528 | } |
| 5529 | return; |
| 5530 | } |
| 5531 | |
| 5532 | Aliases.push_back(GD); |
| 5533 | |
| 5534 | llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType()); |
| 5535 | llvm::Type *ResolverTy = llvm::GlobalIFunc::getResolverFunctionType(DeclTy); |
| 5536 | llvm::Constant *Resolver = |
| 5537 | GetOrCreateLLVMFunction(IFA->getResolver(), ResolverTy, {}, |
| 5538 | /*ForVTable=*/false); |
| 5539 | llvm::GlobalIFunc *GIF = |
| 5540 | llvm::GlobalIFunc::create(DeclTy, 0, llvm::Function::ExternalLinkage, |
| 5541 | "", Resolver, &getModule()); |
| 5542 | if (Entry) { |
| 5543 | if (GIF->getResolver() == Entry) { |
| 5544 | Diags.Report(IFA->getLocation(), diag::err_cyclic_alias) << 1; |
| 5545 | return; |
| 5546 | } |
| 5547 | assert(Entry->isDeclaration())(static_cast <bool> (Entry->isDeclaration()) ? void ( 0) : __assert_fail ("Entry->isDeclaration()", "clang/lib/CodeGen/CodeGenModule.cpp" , 5547, __extension__ __PRETTY_FUNCTION__)); |
| 5548 | |
| 5549 | // If there is a declaration in the module, then we had an extern followed |
| 5550 | // by the ifunc, as in: |
| 5551 | // extern int test(); |
| 5552 | // ... |
| 5553 | // int test() __attribute__((ifunc("resolver"))); |
| 5554 | // |
| 5555 | // Remove it and replace uses of it with the ifunc. |
| 5556 | GIF->takeName(Entry); |
| 5557 | |
| 5558 | Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GIF, |
| 5559 | Entry->getType())); |
| 5560 | Entry->eraseFromParent(); |
| 5561 | } else |
| 5562 | GIF->setName(MangledName); |
| 5563 | |
| 5564 | SetCommonAttributes(GD, GIF); |
| 5565 | } |
| 5566 | |
| 5567 | llvm::Function *CodeGenModule::getIntrinsic(unsigned IID, |
| 5568 | ArrayRef<llvm::Type*> Tys) { |
| 5569 | return llvm::Intrinsic::getDeclaration(&getModule(), (llvm::Intrinsic::ID)IID, |
| 5570 | Tys); |
| 5571 | } |
| 5572 | |
| 5573 | static llvm::StringMapEntry<llvm::GlobalVariable *> & |
| 5574 | GetConstantCFStringEntry(llvm::StringMap<llvm::GlobalVariable *> &Map, |
| 5575 | const StringLiteral *Literal, bool TargetIsLSB, |
| 5576 | bool &IsUTF16, unsigned &StringLength) { |
| 5577 | StringRef String = Literal->getString(); |
| 5578 | unsigned NumBytes = String.size(); |
| 5579 | |
| 5580 | // Check for simple case. |
| 5581 | if (!Literal->containsNonAsciiOrNull()) { |
| 5582 | StringLength = NumBytes; |
| 5583 | return *Map.insert(std::make_pair(String, nullptr)).first; |
| 5584 | } |
| 5585 | |
| 5586 | // Otherwise, convert the UTF8 literals into a string of shorts. |
| 5587 | IsUTF16 = true; |
| 5588 | |
| 5589 | SmallVector<llvm::UTF16, 128> ToBuf(NumBytes + 1); // +1 for ending nulls. |
| 5590 | const llvm::UTF8 *FromPtr = (const llvm::UTF8 *)String.data(); |
| 5591 | llvm::UTF16 *ToPtr = &ToBuf[0]; |
| 5592 | |
| 5593 | (void)llvm::ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes, &ToPtr, |
| 5594 | ToPtr + NumBytes, llvm::strictConversion); |
| 5595 | |
| 5596 | // ConvertUTF8toUTF16 returns the length in ToPtr. |
| 5597 | StringLength = ToPtr - &ToBuf[0]; |
| 5598 | |
| 5599 | // Add an explicit null. |
| 5600 | *ToPtr = 0; |
| 5601 | return *Map.insert(std::make_pair( |
| 5602 | StringRef(reinterpret_cast<const char *>(ToBuf.data()), |
| 5603 | (StringLength + 1) * 2), |
| 5604 | nullptr)).first; |
| 5605 | } |
| 5606 | |
| 5607 | ConstantAddress |
| 5608 | CodeGenModule::GetAddrOfConstantCFString(const StringLiteral *Literal) { |
| 5609 | unsigned StringLength = 0; |
| 5610 | bool isUTF16 = false; |
| 5611 | llvm::StringMapEntry<llvm::GlobalVariable *> &Entry = |
| 5612 | GetConstantCFStringEntry(CFConstantStringMap, Literal, |
| 5613 | getDataLayout().isLittleEndian(), isUTF16, |
| 5614 | StringLength); |
| 5615 | |
| 5616 | if (auto *C = Entry.second) |
| 5617 | return ConstantAddress( |
| 5618 | C, C->getValueType(), CharUnits::fromQuantity(C->getAlignment())); |
| 5619 | |
| 5620 | llvm::Constant *Zero = llvm::Constant::getNullValue(Int32Ty); |
| 5621 | llvm::Constant *Zeros[] = { Zero, Zero }; |
| 5622 | |
| 5623 | const ASTContext &Context = getContext(); |
| 5624 | const llvm::Triple &Triple = getTriple(); |
| 5625 | |
| 5626 | const auto CFRuntime = getLangOpts().CFRuntime; |
| 5627 | const bool IsSwiftABI = |
| 5628 | static_cast<unsigned>(CFRuntime) >= |
| 5629 | static_cast<unsigned>(LangOptions::CoreFoundationABI::Swift); |
| 5630 | const bool IsSwift4_1 = CFRuntime == LangOptions::CoreFoundationABI::Swift4_1; |
| 5631 | |
| 5632 | // If we don't already have it, get __CFConstantStringClassReference. |
| 5633 | if (!CFConstantStringClassRef) { |
| 5634 | const char *CFConstantStringClassName = "__CFConstantStringClassReference"; |
| 5635 | llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy); |
| 5636 | Ty = llvm::ArrayType::get(Ty, 0); |
| 5637 | |
| 5638 | switch (CFRuntime) { |
| 5639 | default: break; |
| 5640 | case LangOptions::CoreFoundationABI::Swift: [[fallthrough]]; |
| 5641 | case LangOptions::CoreFoundationABI::Swift5_0: |
| 5642 | CFConstantStringClassName = |
| 5643 | Triple.isOSDarwin() ? "$s15SwiftFoundation19_NSCFConstantStringCN" |
| 5644 | : "$s10Foundation19_NSCFConstantStringCN"; |
| 5645 | Ty = IntPtrTy; |
| 5646 | break; |
| 5647 | case LangOptions::CoreFoundationABI::Swift4_2: |
| 5648 | CFConstantStringClassName = |
| 5649 | Triple.isOSDarwin() ? "$S15SwiftFoundation19_NSCFConstantStringCN" |
| 5650 | : "$S10Foundation19_NSCFConstantStringCN"; |
| 5651 | Ty = IntPtrTy; |
| 5652 | break; |
| 5653 | case LangOptions::CoreFoundationABI::Swift4_1: |
| 5654 | CFConstantStringClassName = |
| 5655 | Triple.isOSDarwin() ? "__T015SwiftFoundation19_NSCFConstantStringCN" |
| 5656 | : "__T010Foundation19_NSCFConstantStringCN"; |
| 5657 | Ty = IntPtrTy; |
| 5658 | break; |
| 5659 | } |
| 5660 | |
| 5661 | llvm::Constant *C = CreateRuntimeVariable(Ty, CFConstantStringClassName); |
| 5662 | |
| 5663 | if (Triple.isOSBinFormatELF() || Triple.isOSBinFormatCOFF()) { |
| 5664 | llvm::GlobalValue *GV = nullptr; |
| 5665 | |
| 5666 | if ((GV = dyn_cast<llvm::GlobalValue>(C))) { |
| 5667 | IdentifierInfo &II = Context.Idents.get(GV->getName()); |
| 5668 | TranslationUnitDecl *TUDecl = Context.getTranslationUnitDecl(); |
| 5669 | DeclContext *DC = TranslationUnitDecl::castToDeclContext(TUDecl); |
| 5670 | |
| 5671 | const VarDecl *VD = nullptr; |
| 5672 | for (const auto *Result : DC->lookup(&II)) |
| 5673 | if ((VD = dyn_cast<VarDecl>(Result))) |
| 5674 | break; |
| 5675 | |
| 5676 | if (Triple.isOSBinFormatELF()) { |
| 5677 | if (!VD) |
| 5678 | GV->setLinkage(llvm::GlobalValue::ExternalLinkage); |
| 5679 | } else { |
| 5680 | GV->setLinkage(llvm::GlobalValue::ExternalLinkage); |
| 5681 | if (!VD || !VD->hasAttr<DLLExportAttr>()) |
| 5682 | GV->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass); |
| 5683 | else |
| 5684 | GV->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass); |
| 5685 | } |
| 5686 | |
| 5687 | setDSOLocal(GV); |
| 5688 | } |
| 5689 | } |
| 5690 | |
| 5691 | // Decay array -> ptr |
| 5692 | CFConstantStringClassRef = |
| 5693 | IsSwiftABI ? llvm::ConstantExpr::getPtrToInt(C, Ty) |
| 5694 | : llvm::ConstantExpr::getGetElementPtr(Ty, C, Zeros); |
| 5695 | } |
| 5696 | |
| 5697 | QualType CFTy = Context.getCFConstantStringType(); |
| 5698 | |
| 5699 | auto *STy = cast<llvm::StructType>(getTypes().ConvertType(CFTy)); |
| 5700 | |
| 5701 | ConstantInitBuilder Builder(*this); |
| 5702 | auto Fields = Builder.beginStruct(STy); |
| 5703 | |
| 5704 | // Class pointer. |
| 5705 | Fields.add(cast<llvm::Constant>(CFConstantStringClassRef)); |
| 5706 | |
| 5707 | // Flags. |
| 5708 | if (IsSwiftABI) { |
| 5709 | Fields.addInt(IntPtrTy, IsSwift4_1 ? 0x05 : 0x01); |
| 5710 | Fields.addInt(Int64Ty, isUTF16 ? 0x07d0 : 0x07c8); |
| 5711 | } else { |
| 5712 | Fields.addInt(IntTy, isUTF16 ? 0x07d0 : 0x07C8); |
| 5713 | } |
| 5714 | |
| 5715 | // String pointer. |
| 5716 | llvm::Constant *C = nullptr; |
| 5717 | if (isUTF16) { |
| 5718 | auto Arr = llvm::ArrayRef( |
| 5719 | reinterpret_cast<uint16_t *>(const_cast<char *>(Entry.first().data())), |
| 5720 | Entry.first().size() / 2); |
| 5721 | C = llvm::ConstantDataArray::get(VMContext, Arr); |
| 5722 | } else { |
| 5723 | C = llvm::ConstantDataArray::getString(VMContext, Entry.first()); |
| 5724 | } |
| 5725 | |
| 5726 | // Note: -fwritable-strings doesn't make the backing store strings of |
| 5727 | // CFStrings writable. (See <rdar://problem/10657500>) |
| 5728 | auto *GV = |
| 5729 | new llvm::GlobalVariable(getModule(), C->getType(), /*isConstant=*/true, |
| 5730 | llvm::GlobalValue::PrivateLinkage, C, ".str"); |
| 5731 | GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global); |
| 5732 | // Don't enforce the target's minimum global alignment, since the only use |
| 5733 | // of the string is via this class initializer. |
| 5734 | CharUnits Align = isUTF16 ? Context.getTypeAlignInChars(Context.ShortTy) |
| 5735 | : Context.getTypeAlignInChars(Context.CharTy); |
| 5736 | GV->setAlignment(Align.getAsAlign()); |
| 5737 | |
| 5738 | // FIXME: We set the section explicitly to avoid a bug in ld64 224.1. |
| 5739 | // Without it LLVM can merge the string with a non unnamed_addr one during |
| 5740 | // LTO. Doing that changes the section it ends in, which surprises ld64. |
| 5741 | if (Triple.isOSBinFormatMachO()) |
| 5742 | GV->setSection(isUTF16 ? "__TEXT,__ustring" |
| 5743 | : "__TEXT,__cstring,cstring_literals"); |
| 5744 | // Make sure the literal ends up in .rodata to allow for safe ICF and for |
| 5745 | // the static linker to adjust permissions to read-only later on. |
| 5746 | else if (Triple.isOSBinFormatELF()) |
| 5747 | GV->setSection(".rodata"); |
| 5748 | |
| 5749 | // String. |
| 5750 | llvm::Constant *Str = |
| 5751 | llvm::ConstantExpr::getGetElementPtr(GV->getValueType(), GV, Zeros); |
| 5752 | |
| 5753 | if (isUTF16) |
| 5754 | // Cast the UTF16 string to the correct type. |
| 5755 | Str = llvm::ConstantExpr::getBitCast(Str, Int8PtrTy); |
| 5756 | Fields.add(Str); |
| 5757 | |
| 5758 | // String length. |
| 5759 | llvm::IntegerType *LengthTy = |
| 5760 | llvm::IntegerType::get(getModule().getContext(), |
| 5761 | Context.getTargetInfo().getLongWidth()); |
| 5762 | if (IsSwiftABI) { |
| 5763 | if (CFRuntime == LangOptions::CoreFoundationABI::Swift4_1 || |
| 5764 | CFRuntime == LangOptions::CoreFoundationABI::Swift4_2) |
| 5765 | LengthTy = Int32Ty; |
| 5766 | else |
| 5767 | LengthTy = IntPtrTy; |
| 5768 | } |
| 5769 | Fields.addInt(LengthTy, StringLength); |
| 5770 | |
| 5771 | // Swift ABI requires 8-byte alignment to ensure that the _Atomic(uint64_t) is |
| 5772 | // properly aligned on 32-bit platforms. |
| 5773 | CharUnits Alignment = |
| 5774 | IsSwiftABI ? Context.toCharUnitsFromBits(64) : getPointerAlign(); |
| 5775 | |
| 5776 | // The struct. |
| 5777 | GV = Fields.finishAndCreateGlobal("_unnamed_cfstring_", Alignment, |
| 5778 | /*isConstant=*/false, |
| 5779 | llvm::GlobalVariable::PrivateLinkage); |
| 5780 | GV->addAttribute("objc_arc_inert"); |
| 5781 | switch (Triple.getObjectFormat()) { |
| 5782 | case llvm::Triple::UnknownObjectFormat: |
| 5783 | llvm_unreachable("unknown file format")::llvm::llvm_unreachable_internal("unknown file format", "clang/lib/CodeGen/CodeGenModule.cpp" , 5783); |
| 5784 | case llvm::Triple::DXContainer: |
| 5785 | case llvm::Triple::GOFF: |
| 5786 | case llvm::Triple::SPIRV: |
| 5787 | case llvm::Triple::XCOFF: |
| 5788 | llvm_unreachable("unimplemented")::llvm::llvm_unreachable_internal("unimplemented", "clang/lib/CodeGen/CodeGenModule.cpp" , 5788); |
| 5789 | case llvm::Triple::COFF: |
| 5790 | case llvm::Triple::ELF: |
| 5791 | case llvm::Triple::Wasm: |
| 5792 | GV->setSection("cfstring"); |
| 5793 | break; |
| 5794 | case llvm::Triple::MachO: |
| 5795 | GV->setSection("__DATA,__cfstring"); |
| 5796 | break; |
| 5797 | } |
| 5798 | Entry.second = GV; |
| 5799 | |
| 5800 | return ConstantAddress(GV, GV->getValueType(), Alignment); |
| 5801 | } |
| 5802 | |
| 5803 | bool CodeGenModule::getExpressionLocationsEnabled() const { |
| 5804 | return !CodeGenOpts.EmitCodeView || CodeGenOpts.DebugColumnInfo; |
| 5805 | } |
| 5806 | |
| 5807 | QualType CodeGenModule::getObjCFastEnumerationStateType() { |
| 5808 | if (ObjCFastEnumerationStateType.isNull()) { |
| 5809 | RecordDecl *D = Context.buildImplicitRecord("__objcFastEnumerationState"); |
| 5810 | D->startDefinition(); |
| 5811 | |
| 5812 | QualType FieldTypes[] = { |
| 5813 | Context.UnsignedLongTy, |
| 5814 | Context.getPointerType(Context.getObjCIdType()), |
| 5815 | Context.getPointerType(Context.UnsignedLongTy), |
| 5816 | Context.getConstantArrayType(Context.UnsignedLongTy, |
| 5817 | llvm::APInt(32, 5), nullptr, ArrayType::Normal, 0) |
| 5818 | }; |
| 5819 | |
| 5820 | for (size_t i = 0; i < 4; ++i) { |
| 5821 | FieldDecl *Field = FieldDecl::Create(Context, |
| 5822 | D, |
| 5823 | SourceLocation(), |
| 5824 | SourceLocation(), nullptr, |
| 5825 | FieldTypes[i], /*TInfo=*/nullptr, |
| 5826 | /*BitWidth=*/nullptr, |
| 5827 | /*Mutable=*/false, |
| 5828 | ICIS_NoInit); |
| 5829 | Field->setAccess(AS_public); |
| 5830 | D->addDecl(Field); |
| 5831 | } |
| 5832 | |
| 5833 | D->completeDefinition(); |
| 5834 | ObjCFastEnumerationStateType = Context.getTagDeclType(D); |
| 5835 | } |
| 5836 | |
| 5837 | return ObjCFastEnumerationStateType; |
| 5838 | } |
| 5839 | |
| 5840 | llvm::Constant * |
| 5841 | CodeGenModule::GetConstantArrayFromStringLiteral(const StringLiteral *E) { |
| 5842 | assert(!E->getType()->isPointerType() && "Strings are always arrays")(static_cast < |