CodeGenModule.cpp revision 223017
1//===--- CodeGenModule.cpp - Emit LLVM Code from ASTs for a Module --------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This coordinates the per-module state used while generating code. 11// 12//===----------------------------------------------------------------------===// 13 14#include "CodeGenModule.h" 15#include "CGDebugInfo.h" 16#include "CodeGenFunction.h" 17#include "CodeGenTBAA.h" 18#include "CGCall.h" 19#include "CGCXXABI.h" 20#include "CGObjCRuntime.h" 21#include "TargetInfo.h" 22#include "clang/Frontend/CodeGenOptions.h" 23#include "clang/AST/ASTContext.h" 24#include "clang/AST/CharUnits.h" 25#include "clang/AST/DeclObjC.h" 26#include "clang/AST/DeclCXX.h" 27#include "clang/AST/DeclTemplate.h" 28#include "clang/AST/Mangle.h" 29#include "clang/AST/RecordLayout.h" 30#include "clang/Basic/Builtins.h" 31#include "clang/Basic/Diagnostic.h" 32#include "clang/Basic/SourceManager.h" 33#include "clang/Basic/TargetInfo.h" 34#include "clang/Basic/ConvertUTF.h" 35#include "llvm/CallingConv.h" 36#include "llvm/Module.h" 37#include "llvm/Intrinsics.h" 38#include "llvm/LLVMContext.h" 39#include "llvm/ADT/Triple.h" 40#include "llvm/Target/Mangler.h" 41#include "llvm/Target/TargetData.h" 42#include "llvm/Support/CallSite.h" 43#include "llvm/Support/ErrorHandling.h" 44using namespace clang; 45using namespace CodeGen; 46 47static CGCXXABI &createCXXABI(CodeGenModule &CGM) { 48 switch (CGM.getContext().Target.getCXXABI()) { 49 case CXXABI_ARM: return *CreateARMCXXABI(CGM); 50 case CXXABI_Itanium: return *CreateItaniumCXXABI(CGM); 51 case CXXABI_Microsoft: return *CreateMicrosoftCXXABI(CGM); 52 } 53 54 llvm_unreachable("invalid C++ ABI kind"); 55 return *CreateItaniumCXXABI(CGM); 56} 57 58 59CodeGenModule::CodeGenModule(ASTContext &C, const CodeGenOptions &CGO, 60 llvm::Module &M, const llvm::TargetData &TD, 61 Diagnostic &diags) 62 : Context(C), Features(C.getLangOptions()), CodeGenOpts(CGO), TheModule(M), 63 TheTargetData(TD), TheTargetCodeGenInfo(0), Diags(diags), 64 ABI(createCXXABI(*this)), 65 Types(C, M, TD, getTargetCodeGenInfo().getABIInfo(), ABI), 66 TBAA(0), 67 VTables(*this), Runtime(0), DebugInfo(0), 68 CFConstantStringClassRef(0), ConstantStringClassRef(0), 69 VMContext(M.getContext()), 70 NSConcreteGlobalBlockDecl(0), NSConcreteStackBlockDecl(0), 71 NSConcreteGlobalBlock(0), NSConcreteStackBlock(0), 72 BlockObjectAssignDecl(0), BlockObjectDisposeDecl(0), 73 BlockObjectAssign(0), BlockObjectDispose(0), 74 BlockDescriptorType(0), GenericBlockLiteralType(0) { 75 if (Features.ObjC1) 76 createObjCRuntime(); 77 78 // Enable TBAA unless it's suppressed. 79 if (!CodeGenOpts.RelaxedAliasing && CodeGenOpts.OptimizationLevel > 0) 80 TBAA = new CodeGenTBAA(Context, VMContext, getLangOptions(), 81 ABI.getMangleContext()); 82 83 // If debug info or coverage generation is enabled, create the CGDebugInfo 84 // object. 85 if (CodeGenOpts.DebugInfo || CodeGenOpts.EmitGcovArcs || 86 CodeGenOpts.EmitGcovNotes) 87 DebugInfo = new CGDebugInfo(*this); 88 89 Block.GlobalUniqueCount = 0; 90 91 // Initialize the type cache. 92 llvm::LLVMContext &LLVMContext = M.getContext(); 93 VoidTy = llvm::Type::getVoidTy(LLVMContext); 94 Int8Ty = llvm::Type::getInt8Ty(LLVMContext); 95 Int32Ty = llvm::Type::getInt32Ty(LLVMContext); 96 Int64Ty = llvm::Type::getInt64Ty(LLVMContext); 97 PointerWidthInBits = C.Target.getPointerWidth(0); 98 PointerAlignInBytes = 99 C.toCharUnitsFromBits(C.Target.getPointerAlign(0)).getQuantity(); 100 IntTy = llvm::IntegerType::get(LLVMContext, C.Target.getIntWidth()); 101 IntPtrTy = llvm::IntegerType::get(LLVMContext, PointerWidthInBits); 102 Int8PtrTy = Int8Ty->getPointerTo(0); 103 Int8PtrPtrTy = Int8PtrTy->getPointerTo(0); 104} 105 106CodeGenModule::~CodeGenModule() { 107 delete Runtime; 108 delete &ABI; 109 delete TBAA; 110 delete DebugInfo; 111} 112 113void CodeGenModule::createObjCRuntime() { 114 if (!Features.NeXTRuntime) 115 Runtime = CreateGNUObjCRuntime(*this); 116 else 117 Runtime = CreateMacObjCRuntime(*this); 118} 119 120void CodeGenModule::Release() { 121 EmitDeferred(); 122 EmitCXXGlobalInitFunc(); 123 EmitCXXGlobalDtorFunc(); 124 if (Runtime) 125 if (llvm::Function *ObjCInitFunction = Runtime->ModuleInitFunction()) 126 AddGlobalCtor(ObjCInitFunction); 127 EmitCtorList(GlobalCtors, "llvm.global_ctors"); 128 EmitCtorList(GlobalDtors, "llvm.global_dtors"); 129 EmitAnnotations(); 130 EmitLLVMUsed(); 131 132 SimplifyPersonality(); 133 134 if (getCodeGenOpts().EmitDeclMetadata) 135 EmitDeclMetadata(); 136 137 if (getCodeGenOpts().EmitGcovArcs || getCodeGenOpts().EmitGcovNotes) 138 EmitCoverageFile(); 139} 140 141void CodeGenModule::UpdateCompletedType(const TagDecl *TD) { 142 // Make sure that this type is translated. 143 Types.UpdateCompletedType(TD); 144 if (DebugInfo) 145 DebugInfo->UpdateCompletedType(TD); 146} 147 148llvm::MDNode *CodeGenModule::getTBAAInfo(QualType QTy) { 149 if (!TBAA) 150 return 0; 151 return TBAA->getTBAAInfo(QTy); 152} 153 154void CodeGenModule::DecorateInstruction(llvm::Instruction *Inst, 155 llvm::MDNode *TBAAInfo) { 156 Inst->setMetadata(llvm::LLVMContext::MD_tbaa, TBAAInfo); 157} 158 159bool CodeGenModule::isTargetDarwin() const { 160 return getContext().Target.getTriple().isOSDarwin(); 161} 162 163void CodeGenModule::Error(SourceLocation loc, llvm::StringRef error) { 164 unsigned diagID = getDiags().getCustomDiagID(Diagnostic::Error, error); 165 getDiags().Report(Context.getFullLoc(loc), diagID); 166} 167 168/// ErrorUnsupported - Print out an error that codegen doesn't support the 169/// specified stmt yet. 170void CodeGenModule::ErrorUnsupported(const Stmt *S, const char *Type, 171 bool OmitOnError) { 172 if (OmitOnError && getDiags().hasErrorOccurred()) 173 return; 174 unsigned DiagID = getDiags().getCustomDiagID(Diagnostic::Error, 175 "cannot compile this %0 yet"); 176 std::string Msg = Type; 177 getDiags().Report(Context.getFullLoc(S->getLocStart()), DiagID) 178 << Msg << S->getSourceRange(); 179} 180 181/// ErrorUnsupported - Print out an error that codegen doesn't support the 182/// specified decl yet. 183void CodeGenModule::ErrorUnsupported(const Decl *D, const char *Type, 184 bool OmitOnError) { 185 if (OmitOnError && getDiags().hasErrorOccurred()) 186 return; 187 unsigned DiagID = getDiags().getCustomDiagID(Diagnostic::Error, 188 "cannot compile this %0 yet"); 189 std::string Msg = Type; 190 getDiags().Report(Context.getFullLoc(D->getLocation()), DiagID) << Msg; 191} 192 193void CodeGenModule::setGlobalVisibility(llvm::GlobalValue *GV, 194 const NamedDecl *D) const { 195 // Internal definitions always have default visibility. 196 if (GV->hasLocalLinkage()) { 197 GV->setVisibility(llvm::GlobalValue::DefaultVisibility); 198 return; 199 } 200 201 // Set visibility for definitions. 202 NamedDecl::LinkageInfo LV = D->getLinkageAndVisibility(); 203 if (LV.visibilityExplicit() || !GV->hasAvailableExternallyLinkage()) 204 GV->setVisibility(GetLLVMVisibility(LV.visibility())); 205} 206 207/// Set the symbol visibility of type information (vtable and RTTI) 208/// associated with the given type. 209void CodeGenModule::setTypeVisibility(llvm::GlobalValue *GV, 210 const CXXRecordDecl *RD, 211 TypeVisibilityKind TVK) const { 212 setGlobalVisibility(GV, RD); 213 214 if (!CodeGenOpts.HiddenWeakVTables) 215 return; 216 217 // We never want to drop the visibility for RTTI names. 218 if (TVK == TVK_ForRTTIName) 219 return; 220 221 // We want to drop the visibility to hidden for weak type symbols. 222 // This isn't possible if there might be unresolved references 223 // elsewhere that rely on this symbol being visible. 224 225 // This should be kept roughly in sync with setThunkVisibility 226 // in CGVTables.cpp. 227 228 // Preconditions. 229 if (GV->getLinkage() != llvm::GlobalVariable::LinkOnceODRLinkage || 230 GV->getVisibility() != llvm::GlobalVariable::DefaultVisibility) 231 return; 232 233 // Don't override an explicit visibility attribute. 234 if (RD->getExplicitVisibility()) 235 return; 236 237 switch (RD->getTemplateSpecializationKind()) { 238 // We have to disable the optimization if this is an EI definition 239 // because there might be EI declarations in other shared objects. 240 case TSK_ExplicitInstantiationDefinition: 241 case TSK_ExplicitInstantiationDeclaration: 242 return; 243 244 // Every use of a non-template class's type information has to emit it. 245 case TSK_Undeclared: 246 break; 247 248 // In theory, implicit instantiations can ignore the possibility of 249 // an explicit instantiation declaration because there necessarily 250 // must be an EI definition somewhere with default visibility. In 251 // practice, it's possible to have an explicit instantiation for 252 // an arbitrary template class, and linkers aren't necessarily able 253 // to deal with mixed-visibility symbols. 254 case TSK_ExplicitSpecialization: 255 case TSK_ImplicitInstantiation: 256 if (!CodeGenOpts.HiddenWeakTemplateVTables) 257 return; 258 break; 259 } 260 261 // If there's a key function, there may be translation units 262 // that don't have the key function's definition. But ignore 263 // this if we're emitting RTTI under -fno-rtti. 264 if (!(TVK != TVK_ForRTTI) || Features.RTTI) { 265 if (Context.getKeyFunction(RD)) 266 return; 267 } 268 269 // Otherwise, drop the visibility to hidden. 270 GV->setVisibility(llvm::GlobalValue::HiddenVisibility); 271 GV->setUnnamedAddr(true); 272} 273 274llvm::StringRef CodeGenModule::getMangledName(GlobalDecl GD) { 275 const NamedDecl *ND = cast<NamedDecl>(GD.getDecl()); 276 277 llvm::StringRef &Str = MangledDeclNames[GD.getCanonicalDecl()]; 278 if (!Str.empty()) 279 return Str; 280 281 if (!getCXXABI().getMangleContext().shouldMangleDeclName(ND)) { 282 IdentifierInfo *II = ND->getIdentifier(); 283 assert(II && "Attempt to mangle unnamed decl."); 284 285 Str = II->getName(); 286 return Str; 287 } 288 289 llvm::SmallString<256> Buffer; 290 llvm::raw_svector_ostream Out(Buffer); 291 if (const CXXConstructorDecl *D = dyn_cast<CXXConstructorDecl>(ND)) 292 getCXXABI().getMangleContext().mangleCXXCtor(D, GD.getCtorType(), Out); 293 else if (const CXXDestructorDecl *D = dyn_cast<CXXDestructorDecl>(ND)) 294 getCXXABI().getMangleContext().mangleCXXDtor(D, GD.getDtorType(), Out); 295 else if (const BlockDecl *BD = dyn_cast<BlockDecl>(ND)) 296 getCXXABI().getMangleContext().mangleBlock(BD, Out); 297 else 298 getCXXABI().getMangleContext().mangleName(ND, Out); 299 300 // Allocate space for the mangled name. 301 Out.flush(); 302 size_t Length = Buffer.size(); 303 char *Name = MangledNamesAllocator.Allocate<char>(Length); 304 std::copy(Buffer.begin(), Buffer.end(), Name); 305 306 Str = llvm::StringRef(Name, Length); 307 308 return Str; 309} 310 311void CodeGenModule::getBlockMangledName(GlobalDecl GD, MangleBuffer &Buffer, 312 const BlockDecl *BD) { 313 MangleContext &MangleCtx = getCXXABI().getMangleContext(); 314 const Decl *D = GD.getDecl(); 315 llvm::raw_svector_ostream Out(Buffer.getBuffer()); 316 if (D == 0) 317 MangleCtx.mangleGlobalBlock(BD, Out); 318 else if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 319 MangleCtx.mangleCtorBlock(CD, GD.getCtorType(), BD, Out); 320 else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(D)) 321 MangleCtx.mangleDtorBlock(DD, GD.getDtorType(), BD, Out); 322 else 323 MangleCtx.mangleBlock(cast<DeclContext>(D), BD, Out); 324} 325 326llvm::GlobalValue *CodeGenModule::GetGlobalValue(llvm::StringRef Name) { 327 return getModule().getNamedValue(Name); 328} 329 330/// AddGlobalCtor - Add a function to the list that will be called before 331/// main() runs. 332void CodeGenModule::AddGlobalCtor(llvm::Function * Ctor, int Priority) { 333 // FIXME: Type coercion of void()* types. 334 GlobalCtors.push_back(std::make_pair(Ctor, Priority)); 335} 336 337/// AddGlobalDtor - Add a function to the list that will be called 338/// when the module is unloaded. 339void CodeGenModule::AddGlobalDtor(llvm::Function * Dtor, int Priority) { 340 // FIXME: Type coercion of void()* types. 341 GlobalDtors.push_back(std::make_pair(Dtor, Priority)); 342} 343 344void CodeGenModule::EmitCtorList(const CtorList &Fns, const char *GlobalName) { 345 // Ctor function type is void()*. 346 llvm::FunctionType* CtorFTy = llvm::FunctionType::get(VoidTy, false); 347 llvm::Type *CtorPFTy = llvm::PointerType::getUnqual(CtorFTy); 348 349 // Get the type of a ctor entry, { i32, void ()* }. 350 llvm::StructType* CtorStructTy = 351 llvm::StructType::get(VMContext, llvm::Type::getInt32Ty(VMContext), 352 llvm::PointerType::getUnqual(CtorFTy), NULL); 353 354 // Construct the constructor and destructor arrays. 355 std::vector<llvm::Constant*> Ctors; 356 for (CtorList::const_iterator I = Fns.begin(), E = Fns.end(); I != E; ++I) { 357 std::vector<llvm::Constant*> S; 358 S.push_back(llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), 359 I->second, false)); 360 S.push_back(llvm::ConstantExpr::getBitCast(I->first, CtorPFTy)); 361 Ctors.push_back(llvm::ConstantStruct::get(CtorStructTy, S)); 362 } 363 364 if (!Ctors.empty()) { 365 llvm::ArrayType *AT = llvm::ArrayType::get(CtorStructTy, Ctors.size()); 366 new llvm::GlobalVariable(TheModule, AT, false, 367 llvm::GlobalValue::AppendingLinkage, 368 llvm::ConstantArray::get(AT, Ctors), 369 GlobalName); 370 } 371} 372 373void CodeGenModule::EmitAnnotations() { 374 if (Annotations.empty()) 375 return; 376 377 // Create a new global variable for the ConstantStruct in the Module. 378 llvm::Constant *Array = 379 llvm::ConstantArray::get(llvm::ArrayType::get(Annotations[0]->getType(), 380 Annotations.size()), 381 Annotations); 382 llvm::GlobalValue *gv = 383 new llvm::GlobalVariable(TheModule, Array->getType(), false, 384 llvm::GlobalValue::AppendingLinkage, Array, 385 "llvm.global.annotations"); 386 gv->setSection("llvm.metadata"); 387} 388 389llvm::GlobalValue::LinkageTypes 390CodeGenModule::getFunctionLinkage(const FunctionDecl *D) { 391 GVALinkage Linkage = getContext().GetGVALinkageForFunction(D); 392 393 if (Linkage == GVA_Internal) 394 return llvm::Function::InternalLinkage; 395 396 if (D->hasAttr<DLLExportAttr>()) 397 return llvm::Function::DLLExportLinkage; 398 399 if (D->hasAttr<WeakAttr>()) 400 return llvm::Function::WeakAnyLinkage; 401 402 // In C99 mode, 'inline' functions are guaranteed to have a strong 403 // definition somewhere else, so we can use available_externally linkage. 404 if (Linkage == GVA_C99Inline) 405 return llvm::Function::AvailableExternallyLinkage; 406 407 // In C++, the compiler has to emit a definition in every translation unit 408 // that references the function. We should use linkonce_odr because 409 // a) if all references in this translation unit are optimized away, we 410 // don't need to codegen it. b) if the function persists, it needs to be 411 // merged with other definitions. c) C++ has the ODR, so we know the 412 // definition is dependable. 413 if (Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation) 414 return !Context.getLangOptions().AppleKext 415 ? llvm::Function::LinkOnceODRLinkage 416 : llvm::Function::InternalLinkage; 417 418 // An explicit instantiation of a template has weak linkage, since 419 // explicit instantiations can occur in multiple translation units 420 // and must all be equivalent. However, we are not allowed to 421 // throw away these explicit instantiations. 422 if (Linkage == GVA_ExplicitTemplateInstantiation) 423 return !Context.getLangOptions().AppleKext 424 ? llvm::Function::WeakODRLinkage 425 : llvm::Function::InternalLinkage; 426 427 // Otherwise, we have strong external linkage. 428 assert(Linkage == GVA_StrongExternal); 429 return llvm::Function::ExternalLinkage; 430} 431 432 433/// SetFunctionDefinitionAttributes - Set attributes for a global. 434/// 435/// FIXME: This is currently only done for aliases and functions, but not for 436/// variables (these details are set in EmitGlobalVarDefinition for variables). 437void CodeGenModule::SetFunctionDefinitionAttributes(const FunctionDecl *D, 438 llvm::GlobalValue *GV) { 439 SetCommonAttributes(D, GV); 440} 441 442void CodeGenModule::SetLLVMFunctionAttributes(const Decl *D, 443 const CGFunctionInfo &Info, 444 llvm::Function *F) { 445 unsigned CallingConv; 446 AttributeListType AttributeList; 447 ConstructAttributeList(Info, D, AttributeList, CallingConv); 448 F->setAttributes(llvm::AttrListPtr::get(AttributeList.begin(), 449 AttributeList.size())); 450 F->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv)); 451} 452 453void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D, 454 llvm::Function *F) { 455 if (CodeGenOpts.UnwindTables) 456 F->setHasUWTable(); 457 458 if (!Features.Exceptions && !Features.ObjCNonFragileABI) 459 F->addFnAttr(llvm::Attribute::NoUnwind); 460 461 if (D->hasAttr<AlwaysInlineAttr>()) 462 F->addFnAttr(llvm::Attribute::AlwaysInline); 463 464 if (D->hasAttr<NakedAttr>()) 465 F->addFnAttr(llvm::Attribute::Naked); 466 467 if (D->hasAttr<NoInlineAttr>()) 468 F->addFnAttr(llvm::Attribute::NoInline); 469 470 if (isa<CXXConstructorDecl>(D) || isa<CXXDestructorDecl>(D)) 471 F->setUnnamedAddr(true); 472 473 if (Features.getStackProtectorMode() == LangOptions::SSPOn) 474 F->addFnAttr(llvm::Attribute::StackProtect); 475 else if (Features.getStackProtectorMode() == LangOptions::SSPReq) 476 F->addFnAttr(llvm::Attribute::StackProtectReq); 477 478 unsigned alignment = D->getMaxAlignment() / Context.getCharWidth(); 479 if (alignment) 480 F->setAlignment(alignment); 481 482 // C++ ABI requires 2-byte alignment for member functions. 483 if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D)) 484 F->setAlignment(2); 485} 486 487void CodeGenModule::SetCommonAttributes(const Decl *D, 488 llvm::GlobalValue *GV) { 489 if (const NamedDecl *ND = dyn_cast<NamedDecl>(D)) 490 setGlobalVisibility(GV, ND); 491 else 492 GV->setVisibility(llvm::GlobalValue::DefaultVisibility); 493 494 if (D->hasAttr<UsedAttr>()) 495 AddUsedGlobal(GV); 496 497 if (const SectionAttr *SA = D->getAttr<SectionAttr>()) 498 GV->setSection(SA->getName()); 499 500 getTargetCodeGenInfo().SetTargetAttributes(D, GV, *this); 501} 502 503void CodeGenModule::SetInternalFunctionAttributes(const Decl *D, 504 llvm::Function *F, 505 const CGFunctionInfo &FI) { 506 SetLLVMFunctionAttributes(D, FI, F); 507 SetLLVMFunctionAttributesForDefinition(D, F); 508 509 F->setLinkage(llvm::Function::InternalLinkage); 510 511 SetCommonAttributes(D, F); 512} 513 514void CodeGenModule::SetFunctionAttributes(GlobalDecl GD, 515 llvm::Function *F, 516 bool IsIncompleteFunction) { 517 if (unsigned IID = F->getIntrinsicID()) { 518 // If this is an intrinsic function, set the function's attributes 519 // to the intrinsic's attributes. 520 F->setAttributes(llvm::Intrinsic::getAttributes((llvm::Intrinsic::ID)IID)); 521 return; 522 } 523 524 const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl()); 525 526 if (!IsIncompleteFunction) 527 SetLLVMFunctionAttributes(FD, getTypes().getFunctionInfo(GD), F); 528 529 // Only a few attributes are set on declarations; these may later be 530 // overridden by a definition. 531 532 if (FD->hasAttr<DLLImportAttr>()) { 533 F->setLinkage(llvm::Function::DLLImportLinkage); 534 } else if (FD->hasAttr<WeakAttr>() || 535 FD->isWeakImported()) { 536 // "extern_weak" is overloaded in LLVM; we probably should have 537 // separate linkage types for this. 538 F->setLinkage(llvm::Function::ExternalWeakLinkage); 539 } else { 540 F->setLinkage(llvm::Function::ExternalLinkage); 541 542 NamedDecl::LinkageInfo LV = FD->getLinkageAndVisibility(); 543 if (LV.linkage() == ExternalLinkage && LV.visibilityExplicit()) { 544 F->setVisibility(GetLLVMVisibility(LV.visibility())); 545 } 546 } 547 548 if (const SectionAttr *SA = FD->getAttr<SectionAttr>()) 549 F->setSection(SA->getName()); 550} 551 552void CodeGenModule::AddUsedGlobal(llvm::GlobalValue *GV) { 553 assert(!GV->isDeclaration() && 554 "Only globals with definition can force usage."); 555 LLVMUsed.push_back(GV); 556} 557 558void CodeGenModule::EmitLLVMUsed() { 559 // Don't create llvm.used if there is no need. 560 if (LLVMUsed.empty()) 561 return; 562 563 const llvm::Type *i8PTy = llvm::Type::getInt8PtrTy(VMContext); 564 565 // Convert LLVMUsed to what ConstantArray needs. 566 std::vector<llvm::Constant*> UsedArray; 567 UsedArray.resize(LLVMUsed.size()); 568 for (unsigned i = 0, e = LLVMUsed.size(); i != e; ++i) { 569 UsedArray[i] = 570 llvm::ConstantExpr::getBitCast(cast<llvm::Constant>(&*LLVMUsed[i]), 571 i8PTy); 572 } 573 574 if (UsedArray.empty()) 575 return; 576 llvm::ArrayType *ATy = llvm::ArrayType::get(i8PTy, UsedArray.size()); 577 578 llvm::GlobalVariable *GV = 579 new llvm::GlobalVariable(getModule(), ATy, false, 580 llvm::GlobalValue::AppendingLinkage, 581 llvm::ConstantArray::get(ATy, UsedArray), 582 "llvm.used"); 583 584 GV->setSection("llvm.metadata"); 585} 586 587void CodeGenModule::EmitDeferred() { 588 // Emit code for any potentially referenced deferred decls. Since a 589 // previously unused static decl may become used during the generation of code 590 // for a static function, iterate until no changes are made. 591 592 while (!DeferredDeclsToEmit.empty() || !DeferredVTables.empty()) { 593 if (!DeferredVTables.empty()) { 594 const CXXRecordDecl *RD = DeferredVTables.back(); 595 DeferredVTables.pop_back(); 596 getVTables().GenerateClassData(getVTableLinkage(RD), RD); 597 continue; 598 } 599 600 GlobalDecl D = DeferredDeclsToEmit.back(); 601 DeferredDeclsToEmit.pop_back(); 602 603 // Check to see if we've already emitted this. This is necessary 604 // for a couple of reasons: first, decls can end up in the 605 // deferred-decls queue multiple times, and second, decls can end 606 // up with definitions in unusual ways (e.g. by an extern inline 607 // function acquiring a strong function redefinition). Just 608 // ignore these cases. 609 // 610 // TODO: That said, looking this up multiple times is very wasteful. 611 llvm::StringRef Name = getMangledName(D); 612 llvm::GlobalValue *CGRef = GetGlobalValue(Name); 613 assert(CGRef && "Deferred decl wasn't referenced?"); 614 615 if (!CGRef->isDeclaration()) 616 continue; 617 618 // GlobalAlias::isDeclaration() defers to the aliasee, but for our 619 // purposes an alias counts as a definition. 620 if (isa<llvm::GlobalAlias>(CGRef)) 621 continue; 622 623 // Otherwise, emit the definition and move on to the next one. 624 EmitGlobalDefinition(D); 625 } 626} 627 628/// EmitAnnotateAttr - Generate the llvm::ConstantStruct which contains the 629/// annotation information for a given GlobalValue. The annotation struct is 630/// {i8 *, i8 *, i8 *, i32}. The first field is a constant expression, the 631/// GlobalValue being annotated. The second field is the constant string 632/// created from the AnnotateAttr's annotation. The third field is a constant 633/// string containing the name of the translation unit. The fourth field is 634/// the line number in the file of the annotated value declaration. 635/// 636/// FIXME: this does not unique the annotation string constants, as llvm-gcc 637/// appears to. 638/// 639llvm::Constant *CodeGenModule::EmitAnnotateAttr(llvm::GlobalValue *GV, 640 const AnnotateAttr *AA, 641 unsigned LineNo) { 642 llvm::Module *M = &getModule(); 643 644 // get [N x i8] constants for the annotation string, and the filename string 645 // which are the 2nd and 3rd elements of the global annotation structure. 646 const llvm::Type *SBP = llvm::Type::getInt8PtrTy(VMContext); 647 llvm::Constant *anno = llvm::ConstantArray::get(VMContext, 648 AA->getAnnotation(), true); 649 llvm::Constant *unit = llvm::ConstantArray::get(VMContext, 650 M->getModuleIdentifier(), 651 true); 652 653 // Get the two global values corresponding to the ConstantArrays we just 654 // created to hold the bytes of the strings. 655 llvm::GlobalValue *annoGV = 656 new llvm::GlobalVariable(*M, anno->getType(), false, 657 llvm::GlobalValue::PrivateLinkage, anno, 658 GV->getName()); 659 // translation unit name string, emitted into the llvm.metadata section. 660 llvm::GlobalValue *unitGV = 661 new llvm::GlobalVariable(*M, unit->getType(), false, 662 llvm::GlobalValue::PrivateLinkage, unit, 663 ".str"); 664 unitGV->setUnnamedAddr(true); 665 666 // Create the ConstantStruct for the global annotation. 667 llvm::Constant *Fields[4] = { 668 llvm::ConstantExpr::getBitCast(GV, SBP), 669 llvm::ConstantExpr::getBitCast(annoGV, SBP), 670 llvm::ConstantExpr::getBitCast(unitGV, SBP), 671 llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), LineNo) 672 }; 673 return llvm::ConstantStruct::get(VMContext, Fields, 4, false); 674} 675 676bool CodeGenModule::MayDeferGeneration(const ValueDecl *Global) { 677 // Never defer when EmitAllDecls is specified. 678 if (Features.EmitAllDecls) 679 return false; 680 681 return !getContext().DeclMustBeEmitted(Global); 682} 683 684llvm::Constant *CodeGenModule::GetWeakRefReference(const ValueDecl *VD) { 685 const AliasAttr *AA = VD->getAttr<AliasAttr>(); 686 assert(AA && "No alias?"); 687 688 const llvm::Type *DeclTy = getTypes().ConvertTypeForMem(VD->getType()); 689 690 // See if there is already something with the target's name in the module. 691 llvm::GlobalValue *Entry = GetGlobalValue(AA->getAliasee()); 692 693 llvm::Constant *Aliasee; 694 if (isa<llvm::FunctionType>(DeclTy)) 695 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy, GlobalDecl(), 696 /*ForVTable=*/false); 697 else 698 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(), 699 llvm::PointerType::getUnqual(DeclTy), 0); 700 if (!Entry) { 701 llvm::GlobalValue* F = cast<llvm::GlobalValue>(Aliasee); 702 F->setLinkage(llvm::Function::ExternalWeakLinkage); 703 WeakRefReferences.insert(F); 704 } 705 706 return Aliasee; 707} 708 709void CodeGenModule::EmitGlobal(GlobalDecl GD) { 710 const ValueDecl *Global = cast<ValueDecl>(GD.getDecl()); 711 712 // Weak references don't produce any output by themselves. 713 if (Global->hasAttr<WeakRefAttr>()) 714 return; 715 716 // If this is an alias definition (which otherwise looks like a declaration) 717 // emit it now. 718 if (Global->hasAttr<AliasAttr>()) 719 return EmitAliasDefinition(GD); 720 721 // Ignore declarations, they will be emitted on their first use. 722 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Global)) { 723 if (FD->getIdentifier()) { 724 llvm::StringRef Name = FD->getName(); 725 if (Name == "_Block_object_assign") { 726 BlockObjectAssignDecl = FD; 727 } else if (Name == "_Block_object_dispose") { 728 BlockObjectDisposeDecl = FD; 729 } 730 } 731 732 // Forward declarations are emitted lazily on first use. 733 if (!FD->doesThisDeclarationHaveABody()) 734 return; 735 } else { 736 const VarDecl *VD = cast<VarDecl>(Global); 737 assert(VD->isFileVarDecl() && "Cannot emit local var decl as global."); 738 739 if (VD->getIdentifier()) { 740 llvm::StringRef Name = VD->getName(); 741 if (Name == "_NSConcreteGlobalBlock") { 742 NSConcreteGlobalBlockDecl = VD; 743 } else if (Name == "_NSConcreteStackBlock") { 744 NSConcreteStackBlockDecl = VD; 745 } 746 } 747 748 749 if (VD->isThisDeclarationADefinition() != VarDecl::Definition) 750 return; 751 } 752 753 // Defer code generation when possible if this is a static definition, inline 754 // function etc. These we only want to emit if they are used. 755 if (!MayDeferGeneration(Global)) { 756 // Emit the definition if it can't be deferred. 757 EmitGlobalDefinition(GD); 758 return; 759 } 760 761 // If we're deferring emission of a C++ variable with an 762 // initializer, remember the order in which it appeared in the file. 763 if (getLangOptions().CPlusPlus && isa<VarDecl>(Global) && 764 cast<VarDecl>(Global)->hasInit()) { 765 DelayedCXXInitPosition[Global] = CXXGlobalInits.size(); 766 CXXGlobalInits.push_back(0); 767 } 768 769 // If the value has already been used, add it directly to the 770 // DeferredDeclsToEmit list. 771 llvm::StringRef MangledName = getMangledName(GD); 772 if (GetGlobalValue(MangledName)) 773 DeferredDeclsToEmit.push_back(GD); 774 else { 775 // Otherwise, remember that we saw a deferred decl with this name. The 776 // first use of the mangled name will cause it to move into 777 // DeferredDeclsToEmit. 778 DeferredDecls[MangledName] = GD; 779 } 780} 781 782void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD) { 783 const ValueDecl *D = cast<ValueDecl>(GD.getDecl()); 784 785 PrettyStackTraceDecl CrashInfo(const_cast<ValueDecl *>(D), D->getLocation(), 786 Context.getSourceManager(), 787 "Generating code for declaration"); 788 789 if (const FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 790 // At -O0, don't generate IR for functions with available_externally 791 // linkage. 792 if (CodeGenOpts.OptimizationLevel == 0 && 793 !Function->hasAttr<AlwaysInlineAttr>() && 794 getFunctionLinkage(Function) 795 == llvm::Function::AvailableExternallyLinkage) 796 return; 797 798 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 799 // Make sure to emit the definition(s) before we emit the thunks. 800 // This is necessary for the generation of certain thunks. 801 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(Method)) 802 EmitCXXConstructor(CD, GD.getCtorType()); 803 else if (const CXXDestructorDecl *DD =dyn_cast<CXXDestructorDecl>(Method)) 804 EmitCXXDestructor(DD, GD.getDtorType()); 805 else 806 EmitGlobalFunctionDefinition(GD); 807 808 if (Method->isVirtual()) 809 getVTables().EmitThunks(GD); 810 811 return; 812 } 813 814 return EmitGlobalFunctionDefinition(GD); 815 } 816 817 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 818 return EmitGlobalVarDefinition(VD); 819 820 assert(0 && "Invalid argument to EmitGlobalDefinition()"); 821} 822 823/// GetOrCreateLLVMFunction - If the specified mangled name is not in the 824/// module, create and return an llvm Function with the specified type. If there 825/// is something in the module with the specified name, return it potentially 826/// bitcasted to the right type. 827/// 828/// If D is non-null, it specifies a decl that correspond to this. This is used 829/// to set the attributes on the function when it is first created. 830llvm::Constant * 831CodeGenModule::GetOrCreateLLVMFunction(llvm::StringRef MangledName, 832 const llvm::Type *Ty, 833 GlobalDecl D, bool ForVTable) { 834 // Lookup the entry, lazily creating it if necessary. 835 llvm::GlobalValue *Entry = GetGlobalValue(MangledName); 836 if (Entry) { 837 if (WeakRefReferences.count(Entry)) { 838 const FunctionDecl *FD = cast_or_null<FunctionDecl>(D.getDecl()); 839 if (FD && !FD->hasAttr<WeakAttr>()) 840 Entry->setLinkage(llvm::Function::ExternalLinkage); 841 842 WeakRefReferences.erase(Entry); 843 } 844 845 if (Entry->getType()->getElementType() == Ty) 846 return Entry; 847 848 // Make sure the result is of the correct type. 849 const llvm::Type *PTy = llvm::PointerType::getUnqual(Ty); 850 return llvm::ConstantExpr::getBitCast(Entry, PTy); 851 } 852 853 // This function doesn't have a complete type (for example, the return 854 // type is an incomplete struct). Use a fake type instead, and make 855 // sure not to try to set attributes. 856 bool IsIncompleteFunction = false; 857 858 const llvm::FunctionType *FTy; 859 if (isa<llvm::FunctionType>(Ty)) { 860 FTy = cast<llvm::FunctionType>(Ty); 861 } else { 862 FTy = llvm::FunctionType::get(VoidTy, false); 863 IsIncompleteFunction = true; 864 } 865 866 llvm::Function *F = llvm::Function::Create(FTy, 867 llvm::Function::ExternalLinkage, 868 MangledName, &getModule()); 869 assert(F->getName() == MangledName && "name was uniqued!"); 870 if (D.getDecl()) 871 SetFunctionAttributes(D, F, IsIncompleteFunction); 872 873 // This is the first use or definition of a mangled name. If there is a 874 // deferred decl with this name, remember that we need to emit it at the end 875 // of the file. 876 llvm::StringMap<GlobalDecl>::iterator DDI = DeferredDecls.find(MangledName); 877 if (DDI != DeferredDecls.end()) { 878 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit 879 // list, and remove it from DeferredDecls (since we don't need it anymore). 880 DeferredDeclsToEmit.push_back(DDI->second); 881 DeferredDecls.erase(DDI); 882 883 // Otherwise, there are cases we have to worry about where we're 884 // using a declaration for which we must emit a definition but where 885 // we might not find a top-level definition: 886 // - member functions defined inline in their classes 887 // - friend functions defined inline in some class 888 // - special member functions with implicit definitions 889 // If we ever change our AST traversal to walk into class methods, 890 // this will be unnecessary. 891 // 892 // We also don't emit a definition for a function if it's going to be an entry 893 // in a vtable, unless it's already marked as used. 894 } else if (getLangOptions().CPlusPlus && D.getDecl()) { 895 // Look for a declaration that's lexically in a record. 896 const FunctionDecl *FD = cast<FunctionDecl>(D.getDecl()); 897 do { 898 if (isa<CXXRecordDecl>(FD->getLexicalDeclContext())) { 899 if (FD->isImplicit() && !ForVTable) { 900 assert(FD->isUsed() && "Sema didn't mark implicit function as used!"); 901 DeferredDeclsToEmit.push_back(D.getWithDecl(FD)); 902 break; 903 } else if (FD->doesThisDeclarationHaveABody()) { 904 DeferredDeclsToEmit.push_back(D.getWithDecl(FD)); 905 break; 906 } 907 } 908 FD = FD->getPreviousDeclaration(); 909 } while (FD); 910 } 911 912 // Make sure the result is of the requested type. 913 if (!IsIncompleteFunction) { 914 assert(F->getType()->getElementType() == Ty); 915 return F; 916 } 917 918 const llvm::Type *PTy = llvm::PointerType::getUnqual(Ty); 919 return llvm::ConstantExpr::getBitCast(F, PTy); 920} 921 922/// GetAddrOfFunction - Return the address of the given function. If Ty is 923/// non-null, then this function will use the specified type if it has to 924/// create it (this occurs when we see a definition of the function). 925llvm::Constant *CodeGenModule::GetAddrOfFunction(GlobalDecl GD, 926 const llvm::Type *Ty, 927 bool ForVTable) { 928 // If there was no specific requested type, just convert it now. 929 if (!Ty) 930 Ty = getTypes().ConvertType(cast<ValueDecl>(GD.getDecl())->getType()); 931 932 llvm::StringRef MangledName = getMangledName(GD); 933 return GetOrCreateLLVMFunction(MangledName, Ty, GD, ForVTable); 934} 935 936/// CreateRuntimeFunction - Create a new runtime function with the specified 937/// type and name. 938llvm::Constant * 939CodeGenModule::CreateRuntimeFunction(const llvm::FunctionType *FTy, 940 llvm::StringRef Name) { 941 return GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(), /*ForVTable=*/false); 942} 943 944static bool DeclIsConstantGlobal(ASTContext &Context, const VarDecl *D, 945 bool ConstantInit) { 946 if (!D->getType().isConstant(Context) && !D->getType()->isReferenceType()) 947 return false; 948 949 if (Context.getLangOptions().CPlusPlus) { 950 if (const RecordType *Record 951 = Context.getBaseElementType(D->getType())->getAs<RecordType>()) 952 return ConstantInit && 953 cast<CXXRecordDecl>(Record->getDecl())->isPOD() && 954 !cast<CXXRecordDecl>(Record->getDecl())->hasMutableFields(); 955 } 956 957 return true; 958} 959 960/// GetOrCreateLLVMGlobal - If the specified mangled name is not in the module, 961/// create and return an llvm GlobalVariable with the specified type. If there 962/// is something in the module with the specified name, return it potentially 963/// bitcasted to the right type. 964/// 965/// If D is non-null, it specifies a decl that correspond to this. This is used 966/// to set the attributes on the global when it is first created. 967llvm::Constant * 968CodeGenModule::GetOrCreateLLVMGlobal(llvm::StringRef MangledName, 969 const llvm::PointerType *Ty, 970 const VarDecl *D, 971 bool UnnamedAddr) { 972 // Lookup the entry, lazily creating it if necessary. 973 llvm::GlobalValue *Entry = GetGlobalValue(MangledName); 974 if (Entry) { 975 if (WeakRefReferences.count(Entry)) { 976 if (D && !D->hasAttr<WeakAttr>()) 977 Entry->setLinkage(llvm::Function::ExternalLinkage); 978 979 WeakRefReferences.erase(Entry); 980 } 981 982 if (UnnamedAddr) 983 Entry->setUnnamedAddr(true); 984 985 if (Entry->getType() == Ty) 986 return Entry; 987 988 // Make sure the result is of the correct type. 989 return llvm::ConstantExpr::getBitCast(Entry, Ty); 990 } 991 992 // This is the first use or definition of a mangled name. If there is a 993 // deferred decl with this name, remember that we need to emit it at the end 994 // of the file. 995 llvm::StringMap<GlobalDecl>::iterator DDI = DeferredDecls.find(MangledName); 996 if (DDI != DeferredDecls.end()) { 997 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit 998 // list, and remove it from DeferredDecls (since we don't need it anymore). 999 DeferredDeclsToEmit.push_back(DDI->second); 1000 DeferredDecls.erase(DDI); 1001 } 1002 1003 llvm::GlobalVariable *GV = 1004 new llvm::GlobalVariable(getModule(), Ty->getElementType(), false, 1005 llvm::GlobalValue::ExternalLinkage, 1006 0, MangledName, 0, 1007 false, Ty->getAddressSpace()); 1008 1009 // Handle things which are present even on external declarations. 1010 if (D) { 1011 // FIXME: This code is overly simple and should be merged with other global 1012 // handling. 1013 GV->setConstant(DeclIsConstantGlobal(Context, D, false)); 1014 1015 // Set linkage and visibility in case we never see a definition. 1016 NamedDecl::LinkageInfo LV = D->getLinkageAndVisibility(); 1017 if (LV.linkage() != ExternalLinkage) { 1018 // Don't set internal linkage on declarations. 1019 } else { 1020 if (D->hasAttr<DLLImportAttr>()) 1021 GV->setLinkage(llvm::GlobalValue::DLLImportLinkage); 1022 else if (D->hasAttr<WeakAttr>() || D->isWeakImported()) 1023 GV->setLinkage(llvm::GlobalValue::ExternalWeakLinkage); 1024 1025 // Set visibility on a declaration only if it's explicit. 1026 if (LV.visibilityExplicit()) 1027 GV->setVisibility(GetLLVMVisibility(LV.visibility())); 1028 } 1029 1030 GV->setThreadLocal(D->isThreadSpecified()); 1031 } 1032 1033 return GV; 1034} 1035 1036 1037llvm::GlobalVariable * 1038CodeGenModule::CreateOrReplaceCXXRuntimeVariable(llvm::StringRef Name, 1039 const llvm::Type *Ty, 1040 llvm::GlobalValue::LinkageTypes Linkage) { 1041 llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name); 1042 llvm::GlobalVariable *OldGV = 0; 1043 1044 1045 if (GV) { 1046 // Check if the variable has the right type. 1047 if (GV->getType()->getElementType() == Ty) 1048 return GV; 1049 1050 // Because C++ name mangling, the only way we can end up with an already 1051 // existing global with the same name is if it has been declared extern "C". 1052 assert(GV->isDeclaration() && "Declaration has wrong type!"); 1053 OldGV = GV; 1054 } 1055 1056 // Create a new variable. 1057 GV = new llvm::GlobalVariable(getModule(), Ty, /*isConstant=*/true, 1058 Linkage, 0, Name); 1059 1060 if (OldGV) { 1061 // Replace occurrences of the old variable if needed. 1062 GV->takeName(OldGV); 1063 1064 if (!OldGV->use_empty()) { 1065 llvm::Constant *NewPtrForOldDecl = 1066 llvm::ConstantExpr::getBitCast(GV, OldGV->getType()); 1067 OldGV->replaceAllUsesWith(NewPtrForOldDecl); 1068 } 1069 1070 OldGV->eraseFromParent(); 1071 } 1072 1073 return GV; 1074} 1075 1076/// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the 1077/// given global variable. If Ty is non-null and if the global doesn't exist, 1078/// then it will be greated with the specified type instead of whatever the 1079/// normal requested type would be. 1080llvm::Constant *CodeGenModule::GetAddrOfGlobalVar(const VarDecl *D, 1081 const llvm::Type *Ty) { 1082 assert(D->hasGlobalStorage() && "Not a global variable"); 1083 QualType ASTTy = D->getType(); 1084 if (Ty == 0) 1085 Ty = getTypes().ConvertTypeForMem(ASTTy); 1086 1087 const llvm::PointerType *PTy = 1088 llvm::PointerType::get(Ty, getContext().getTargetAddressSpace(ASTTy)); 1089 1090 llvm::StringRef MangledName = getMangledName(D); 1091 return GetOrCreateLLVMGlobal(MangledName, PTy, D); 1092} 1093 1094/// CreateRuntimeVariable - Create a new runtime global variable with the 1095/// specified type and name. 1096llvm::Constant * 1097CodeGenModule::CreateRuntimeVariable(const llvm::Type *Ty, 1098 llvm::StringRef Name) { 1099 return GetOrCreateLLVMGlobal(Name, llvm::PointerType::getUnqual(Ty), 0, 1100 true); 1101} 1102 1103void CodeGenModule::EmitTentativeDefinition(const VarDecl *D) { 1104 assert(!D->getInit() && "Cannot emit definite definitions here!"); 1105 1106 if (MayDeferGeneration(D)) { 1107 // If we have not seen a reference to this variable yet, place it 1108 // into the deferred declarations table to be emitted if needed 1109 // later. 1110 llvm::StringRef MangledName = getMangledName(D); 1111 if (!GetGlobalValue(MangledName)) { 1112 DeferredDecls[MangledName] = D; 1113 return; 1114 } 1115 } 1116 1117 // The tentative definition is the only definition. 1118 EmitGlobalVarDefinition(D); 1119} 1120 1121void CodeGenModule::EmitVTable(CXXRecordDecl *Class, bool DefinitionRequired) { 1122 if (DefinitionRequired) 1123 getVTables().GenerateClassData(getVTableLinkage(Class), Class); 1124} 1125 1126llvm::GlobalVariable::LinkageTypes 1127CodeGenModule::getVTableLinkage(const CXXRecordDecl *RD) { 1128 if (RD->getLinkage() != ExternalLinkage) 1129 return llvm::GlobalVariable::InternalLinkage; 1130 1131 if (const CXXMethodDecl *KeyFunction 1132 = RD->getASTContext().getKeyFunction(RD)) { 1133 // If this class has a key function, use that to determine the linkage of 1134 // the vtable. 1135 const FunctionDecl *Def = 0; 1136 if (KeyFunction->hasBody(Def)) 1137 KeyFunction = cast<CXXMethodDecl>(Def); 1138 1139 switch (KeyFunction->getTemplateSpecializationKind()) { 1140 case TSK_Undeclared: 1141 case TSK_ExplicitSpecialization: 1142 // When compiling with optimizations turned on, we emit all vtables, 1143 // even if the key function is not defined in the current translation 1144 // unit. If this is the case, use available_externally linkage. 1145 if (!Def && CodeGenOpts.OptimizationLevel) 1146 return llvm::GlobalVariable::AvailableExternallyLinkage; 1147 1148 if (KeyFunction->isInlined()) 1149 return !Context.getLangOptions().AppleKext ? 1150 llvm::GlobalVariable::LinkOnceODRLinkage : 1151 llvm::Function::InternalLinkage; 1152 1153 return llvm::GlobalVariable::ExternalLinkage; 1154 1155 case TSK_ImplicitInstantiation: 1156 return !Context.getLangOptions().AppleKext ? 1157 llvm::GlobalVariable::LinkOnceODRLinkage : 1158 llvm::Function::InternalLinkage; 1159 1160 case TSK_ExplicitInstantiationDefinition: 1161 return !Context.getLangOptions().AppleKext ? 1162 llvm::GlobalVariable::WeakODRLinkage : 1163 llvm::Function::InternalLinkage; 1164 1165 case TSK_ExplicitInstantiationDeclaration: 1166 // FIXME: Use available_externally linkage. However, this currently 1167 // breaks LLVM's build due to undefined symbols. 1168 // return llvm::GlobalVariable::AvailableExternallyLinkage; 1169 return !Context.getLangOptions().AppleKext ? 1170 llvm::GlobalVariable::LinkOnceODRLinkage : 1171 llvm::Function::InternalLinkage; 1172 } 1173 } 1174 1175 if (Context.getLangOptions().AppleKext) 1176 return llvm::Function::InternalLinkage; 1177 1178 switch (RD->getTemplateSpecializationKind()) { 1179 case TSK_Undeclared: 1180 case TSK_ExplicitSpecialization: 1181 case TSK_ImplicitInstantiation: 1182 // FIXME: Use available_externally linkage. However, this currently 1183 // breaks LLVM's build due to undefined symbols. 1184 // return llvm::GlobalVariable::AvailableExternallyLinkage; 1185 case TSK_ExplicitInstantiationDeclaration: 1186 return llvm::GlobalVariable::LinkOnceODRLinkage; 1187 1188 case TSK_ExplicitInstantiationDefinition: 1189 return llvm::GlobalVariable::WeakODRLinkage; 1190 } 1191 1192 // Silence GCC warning. 1193 return llvm::GlobalVariable::LinkOnceODRLinkage; 1194} 1195 1196CharUnits CodeGenModule::GetTargetTypeStoreSize(const llvm::Type *Ty) const { 1197 return Context.toCharUnitsFromBits( 1198 TheTargetData.getTypeStoreSizeInBits(Ty)); 1199} 1200 1201void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D) { 1202 llvm::Constant *Init = 0; 1203 QualType ASTTy = D->getType(); 1204 bool NonConstInit = false; 1205 1206 const Expr *InitExpr = D->getAnyInitializer(); 1207 1208 if (!InitExpr) { 1209 // This is a tentative definition; tentative definitions are 1210 // implicitly initialized with { 0 }. 1211 // 1212 // Note that tentative definitions are only emitted at the end of 1213 // a translation unit, so they should never have incomplete 1214 // type. In addition, EmitTentativeDefinition makes sure that we 1215 // never attempt to emit a tentative definition if a real one 1216 // exists. A use may still exists, however, so we still may need 1217 // to do a RAUW. 1218 assert(!ASTTy->isIncompleteType() && "Unexpected incomplete type"); 1219 Init = EmitNullConstant(D->getType()); 1220 } else { 1221 Init = EmitConstantExpr(InitExpr, D->getType()); 1222 if (!Init) { 1223 QualType T = InitExpr->getType(); 1224 if (D->getType()->isReferenceType()) 1225 T = D->getType(); 1226 1227 if (getLangOptions().CPlusPlus) { 1228 Init = EmitNullConstant(T); 1229 NonConstInit = true; 1230 } else { 1231 ErrorUnsupported(D, "static initializer"); 1232 Init = llvm::UndefValue::get(getTypes().ConvertType(T)); 1233 } 1234 } else { 1235 // We don't need an initializer, so remove the entry for the delayed 1236 // initializer position (just in case this entry was delayed). 1237 if (getLangOptions().CPlusPlus) 1238 DelayedCXXInitPosition.erase(D); 1239 } 1240 } 1241 1242 const llvm::Type* InitType = Init->getType(); 1243 llvm::Constant *Entry = GetAddrOfGlobalVar(D, InitType); 1244 1245 // Strip off a bitcast if we got one back. 1246 if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) { 1247 assert(CE->getOpcode() == llvm::Instruction::BitCast || 1248 // all zero index gep. 1249 CE->getOpcode() == llvm::Instruction::GetElementPtr); 1250 Entry = CE->getOperand(0); 1251 } 1252 1253 // Entry is now either a Function or GlobalVariable. 1254 llvm::GlobalVariable *GV = dyn_cast<llvm::GlobalVariable>(Entry); 1255 1256 // We have a definition after a declaration with the wrong type. 1257 // We must make a new GlobalVariable* and update everything that used OldGV 1258 // (a declaration or tentative definition) with the new GlobalVariable* 1259 // (which will be a definition). 1260 // 1261 // This happens if there is a prototype for a global (e.g. 1262 // "extern int x[];") and then a definition of a different type (e.g. 1263 // "int x[10];"). This also happens when an initializer has a different type 1264 // from the type of the global (this happens with unions). 1265 if (GV == 0 || 1266 GV->getType()->getElementType() != InitType || 1267 GV->getType()->getAddressSpace() != 1268 getContext().getTargetAddressSpace(ASTTy)) { 1269 1270 // Move the old entry aside so that we'll create a new one. 1271 Entry->setName(llvm::StringRef()); 1272 1273 // Make a new global with the correct type, this is now guaranteed to work. 1274 GV = cast<llvm::GlobalVariable>(GetAddrOfGlobalVar(D, InitType)); 1275 1276 // Replace all uses of the old global with the new global 1277 llvm::Constant *NewPtrForOldDecl = 1278 llvm::ConstantExpr::getBitCast(GV, Entry->getType()); 1279 Entry->replaceAllUsesWith(NewPtrForOldDecl); 1280 1281 // Erase the old global, since it is no longer used. 1282 cast<llvm::GlobalValue>(Entry)->eraseFromParent(); 1283 } 1284 1285 if (const AnnotateAttr *AA = D->getAttr<AnnotateAttr>()) { 1286 SourceManager &SM = Context.getSourceManager(); 1287 AddAnnotation(EmitAnnotateAttr(GV, AA, 1288 SM.getInstantiationLineNumber(D->getLocation()))); 1289 } 1290 1291 GV->setInitializer(Init); 1292 1293 // If it is safe to mark the global 'constant', do so now. 1294 GV->setConstant(false); 1295 if (!NonConstInit && DeclIsConstantGlobal(Context, D, true)) 1296 GV->setConstant(true); 1297 1298 GV->setAlignment(getContext().getDeclAlign(D).getQuantity()); 1299 1300 // Set the llvm linkage type as appropriate. 1301 llvm::GlobalValue::LinkageTypes Linkage = 1302 GetLLVMLinkageVarDefinition(D, GV); 1303 GV->setLinkage(Linkage); 1304 if (Linkage == llvm::GlobalVariable::CommonLinkage) 1305 // common vars aren't constant even if declared const. 1306 GV->setConstant(false); 1307 1308 SetCommonAttributes(D, GV); 1309 1310 // Emit the initializer function if necessary. 1311 if (NonConstInit) 1312 EmitCXXGlobalVarDeclInitFunc(D, GV); 1313 1314 // Emit global variable debug information. 1315 if (CGDebugInfo *DI = getModuleDebugInfo()) { 1316 DI->setLocation(D->getLocation()); 1317 DI->EmitGlobalVariable(GV, D); 1318 } 1319} 1320 1321llvm::GlobalValue::LinkageTypes 1322CodeGenModule::GetLLVMLinkageVarDefinition(const VarDecl *D, 1323 llvm::GlobalVariable *GV) { 1324 GVALinkage Linkage = getContext().GetGVALinkageForVariable(D); 1325 if (Linkage == GVA_Internal) 1326 return llvm::Function::InternalLinkage; 1327 else if (D->hasAttr<DLLImportAttr>()) 1328 return llvm::Function::DLLImportLinkage; 1329 else if (D->hasAttr<DLLExportAttr>()) 1330 return llvm::Function::DLLExportLinkage; 1331 else if (D->hasAttr<WeakAttr>()) { 1332 if (GV->isConstant()) 1333 return llvm::GlobalVariable::WeakODRLinkage; 1334 else 1335 return llvm::GlobalVariable::WeakAnyLinkage; 1336 } else if (Linkage == GVA_TemplateInstantiation || 1337 Linkage == GVA_ExplicitTemplateInstantiation) 1338 return llvm::GlobalVariable::WeakODRLinkage; 1339 else if (!getLangOptions().CPlusPlus && 1340 ((!CodeGenOpts.NoCommon && !D->getAttr<NoCommonAttr>()) || 1341 D->getAttr<CommonAttr>()) && 1342 !D->hasExternalStorage() && !D->getInit() && 1343 !D->getAttr<SectionAttr>() && !D->isThreadSpecified()) { 1344 // Thread local vars aren't considered common linkage. 1345 return llvm::GlobalVariable::CommonLinkage; 1346 } 1347 return llvm::GlobalVariable::ExternalLinkage; 1348} 1349 1350/// ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we 1351/// implement a function with no prototype, e.g. "int foo() {}". If there are 1352/// existing call uses of the old function in the module, this adjusts them to 1353/// call the new function directly. 1354/// 1355/// This is not just a cleanup: the always_inline pass requires direct calls to 1356/// functions to be able to inline them. If there is a bitcast in the way, it 1357/// won't inline them. Instcombine normally deletes these calls, but it isn't 1358/// run at -O0. 1359static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old, 1360 llvm::Function *NewFn) { 1361 // If we're redefining a global as a function, don't transform it. 1362 llvm::Function *OldFn = dyn_cast<llvm::Function>(Old); 1363 if (OldFn == 0) return; 1364 1365 const llvm::Type *NewRetTy = NewFn->getReturnType(); 1366 llvm::SmallVector<llvm::Value*, 4> ArgList; 1367 1368 for (llvm::Value::use_iterator UI = OldFn->use_begin(), E = OldFn->use_end(); 1369 UI != E; ) { 1370 // TODO: Do invokes ever occur in C code? If so, we should handle them too. 1371 llvm::Value::use_iterator I = UI++; // Increment before the CI is erased. 1372 llvm::CallInst *CI = dyn_cast<llvm::CallInst>(*I); 1373 if (!CI) continue; // FIXME: when we allow Invoke, just do CallSite CS(*I) 1374 llvm::CallSite CS(CI); 1375 if (!CI || !CS.isCallee(I)) continue; 1376 1377 // If the return types don't match exactly, and if the call isn't dead, then 1378 // we can't transform this call. 1379 if (CI->getType() != NewRetTy && !CI->use_empty()) 1380 continue; 1381 1382 // If the function was passed too few arguments, don't transform. If extra 1383 // arguments were passed, we silently drop them. If any of the types 1384 // mismatch, we don't transform. 1385 unsigned ArgNo = 0; 1386 bool DontTransform = false; 1387 for (llvm::Function::arg_iterator AI = NewFn->arg_begin(), 1388 E = NewFn->arg_end(); AI != E; ++AI, ++ArgNo) { 1389 if (CS.arg_size() == ArgNo || 1390 CS.getArgument(ArgNo)->getType() != AI->getType()) { 1391 DontTransform = true; 1392 break; 1393 } 1394 } 1395 if (DontTransform) 1396 continue; 1397 1398 // Okay, we can transform this. Create the new call instruction and copy 1399 // over the required information. 1400 ArgList.append(CS.arg_begin(), CS.arg_begin() + ArgNo); 1401 llvm::CallInst *NewCall = llvm::CallInst::Create(NewFn, ArgList.begin(), 1402 ArgList.end(), "", CI); 1403 ArgList.clear(); 1404 if (!NewCall->getType()->isVoidTy()) 1405 NewCall->takeName(CI); 1406 NewCall->setAttributes(CI->getAttributes()); 1407 NewCall->setCallingConv(CI->getCallingConv()); 1408 1409 // Finally, remove the old call, replacing any uses with the new one. 1410 if (!CI->use_empty()) 1411 CI->replaceAllUsesWith(NewCall); 1412 1413 // Copy debug location attached to CI. 1414 if (!CI->getDebugLoc().isUnknown()) 1415 NewCall->setDebugLoc(CI->getDebugLoc()); 1416 CI->eraseFromParent(); 1417 } 1418} 1419 1420 1421void CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD) { 1422 const FunctionDecl *D = cast<FunctionDecl>(GD.getDecl()); 1423 1424 // Compute the function info and LLVM type. 1425 const CGFunctionInfo &FI = getTypes().getFunctionInfo(GD); 1426 bool variadic = false; 1427 if (const FunctionProtoType *fpt = D->getType()->getAs<FunctionProtoType>()) 1428 variadic = fpt->isVariadic(); 1429 const llvm::FunctionType *Ty = getTypes().GetFunctionType(FI, variadic, false); 1430 1431 // Get or create the prototype for the function. 1432 llvm::Constant *Entry = GetAddrOfFunction(GD, Ty); 1433 1434 // Strip off a bitcast if we got one back. 1435 if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) { 1436 assert(CE->getOpcode() == llvm::Instruction::BitCast); 1437 Entry = CE->getOperand(0); 1438 } 1439 1440 1441 if (cast<llvm::GlobalValue>(Entry)->getType()->getElementType() != Ty) { 1442 llvm::GlobalValue *OldFn = cast<llvm::GlobalValue>(Entry); 1443 1444 // If the types mismatch then we have to rewrite the definition. 1445 assert(OldFn->isDeclaration() && 1446 "Shouldn't replace non-declaration"); 1447 1448 // F is the Function* for the one with the wrong type, we must make a new 1449 // Function* and update everything that used F (a declaration) with the new 1450 // Function* (which will be a definition). 1451 // 1452 // This happens if there is a prototype for a function 1453 // (e.g. "int f()") and then a definition of a different type 1454 // (e.g. "int f(int x)"). Move the old function aside so that it 1455 // doesn't interfere with GetAddrOfFunction. 1456 OldFn->setName(llvm::StringRef()); 1457 llvm::Function *NewFn = cast<llvm::Function>(GetAddrOfFunction(GD, Ty)); 1458 1459 // If this is an implementation of a function without a prototype, try to 1460 // replace any existing uses of the function (which may be calls) with uses 1461 // of the new function 1462 if (D->getType()->isFunctionNoProtoType()) { 1463 ReplaceUsesOfNonProtoTypeWithRealFunction(OldFn, NewFn); 1464 OldFn->removeDeadConstantUsers(); 1465 } 1466 1467 // Replace uses of F with the Function we will endow with a body. 1468 if (!Entry->use_empty()) { 1469 llvm::Constant *NewPtrForOldDecl = 1470 llvm::ConstantExpr::getBitCast(NewFn, Entry->getType()); 1471 Entry->replaceAllUsesWith(NewPtrForOldDecl); 1472 } 1473 1474 // Ok, delete the old function now, which is dead. 1475 OldFn->eraseFromParent(); 1476 1477 Entry = NewFn; 1478 } 1479 1480 // We need to set linkage and visibility on the function before 1481 // generating code for it because various parts of IR generation 1482 // want to propagate this information down (e.g. to local static 1483 // declarations). 1484 llvm::Function *Fn = cast<llvm::Function>(Entry); 1485 setFunctionLinkage(D, Fn); 1486 1487 // FIXME: this is redundant with part of SetFunctionDefinitionAttributes 1488 setGlobalVisibility(Fn, D); 1489 1490 CodeGenFunction(*this).GenerateCode(D, Fn, FI); 1491 1492 SetFunctionDefinitionAttributes(D, Fn); 1493 SetLLVMFunctionAttributesForDefinition(D, Fn); 1494 1495 if (const ConstructorAttr *CA = D->getAttr<ConstructorAttr>()) 1496 AddGlobalCtor(Fn, CA->getPriority()); 1497 if (const DestructorAttr *DA = D->getAttr<DestructorAttr>()) 1498 AddGlobalDtor(Fn, DA->getPriority()); 1499} 1500 1501void CodeGenModule::EmitAliasDefinition(GlobalDecl GD) { 1502 const ValueDecl *D = cast<ValueDecl>(GD.getDecl()); 1503 const AliasAttr *AA = D->getAttr<AliasAttr>(); 1504 assert(AA && "Not an alias?"); 1505 1506 llvm::StringRef MangledName = getMangledName(GD); 1507 1508 // If there is a definition in the module, then it wins over the alias. 1509 // This is dubious, but allow it to be safe. Just ignore the alias. 1510 llvm::GlobalValue *Entry = GetGlobalValue(MangledName); 1511 if (Entry && !Entry->isDeclaration()) 1512 return; 1513 1514 const llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType()); 1515 1516 // Create a reference to the named value. This ensures that it is emitted 1517 // if a deferred decl. 1518 llvm::Constant *Aliasee; 1519 if (isa<llvm::FunctionType>(DeclTy)) 1520 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy, GlobalDecl(), 1521 /*ForVTable=*/false); 1522 else 1523 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(), 1524 llvm::PointerType::getUnqual(DeclTy), 0); 1525 1526 // Create the new alias itself, but don't set a name yet. 1527 llvm::GlobalValue *GA = 1528 new llvm::GlobalAlias(Aliasee->getType(), 1529 llvm::Function::ExternalLinkage, 1530 "", Aliasee, &getModule()); 1531 1532 if (Entry) { 1533 assert(Entry->isDeclaration()); 1534 1535 // If there is a declaration in the module, then we had an extern followed 1536 // by the alias, as in: 1537 // extern int test6(); 1538 // ... 1539 // int test6() __attribute__((alias("test7"))); 1540 // 1541 // Remove it and replace uses of it with the alias. 1542 GA->takeName(Entry); 1543 1544 Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GA, 1545 Entry->getType())); 1546 Entry->eraseFromParent(); 1547 } else { 1548 GA->setName(MangledName); 1549 } 1550 1551 // Set attributes which are particular to an alias; this is a 1552 // specialization of the attributes which may be set on a global 1553 // variable/function. 1554 if (D->hasAttr<DLLExportAttr>()) { 1555 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1556 // The dllexport attribute is ignored for undefined symbols. 1557 if (FD->hasBody()) 1558 GA->setLinkage(llvm::Function::DLLExportLinkage); 1559 } else { 1560 GA->setLinkage(llvm::Function::DLLExportLinkage); 1561 } 1562 } else if (D->hasAttr<WeakAttr>() || 1563 D->hasAttr<WeakRefAttr>() || 1564 D->isWeakImported()) { 1565 GA->setLinkage(llvm::Function::WeakAnyLinkage); 1566 } 1567 1568 SetCommonAttributes(D, GA); 1569} 1570 1571/// getBuiltinLibFunction - Given a builtin id for a function like 1572/// "__builtin_fabsf", return a Function* for "fabsf". 1573llvm::Value *CodeGenModule::getBuiltinLibFunction(const FunctionDecl *FD, 1574 unsigned BuiltinID) { 1575 assert((Context.BuiltinInfo.isLibFunction(BuiltinID) || 1576 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) && 1577 "isn't a lib fn"); 1578 1579 // Get the name, skip over the __builtin_ prefix (if necessary). 1580 llvm::StringRef Name; 1581 GlobalDecl D(FD); 1582 1583 // If the builtin has been declared explicitly with an assembler label, 1584 // use the mangled name. This differs from the plain label on platforms 1585 // that prefix labels. 1586 if (FD->hasAttr<AsmLabelAttr>()) 1587 Name = getMangledName(D); 1588 else if (Context.BuiltinInfo.isLibFunction(BuiltinID)) 1589 Name = Context.BuiltinInfo.GetName(BuiltinID) + 10; 1590 else 1591 Name = Context.BuiltinInfo.GetName(BuiltinID); 1592 1593 1594 const llvm::FunctionType *Ty = 1595 cast<llvm::FunctionType>(getTypes().ConvertType(FD->getType())); 1596 1597 return GetOrCreateLLVMFunction(Name, Ty, D, /*ForVTable=*/false); 1598} 1599 1600llvm::Function *CodeGenModule::getIntrinsic(unsigned IID,const llvm::Type **Tys, 1601 unsigned NumTys) { 1602 return llvm::Intrinsic::getDeclaration(&getModule(), 1603 (llvm::Intrinsic::ID)IID, Tys, NumTys); 1604} 1605 1606static llvm::StringMapEntry<llvm::Constant*> & 1607GetConstantCFStringEntry(llvm::StringMap<llvm::Constant*> &Map, 1608 const StringLiteral *Literal, 1609 bool TargetIsLSB, 1610 bool &IsUTF16, 1611 unsigned &StringLength) { 1612 llvm::StringRef String = Literal->getString(); 1613 unsigned NumBytes = String.size(); 1614 1615 // Check for simple case. 1616 if (!Literal->containsNonAsciiOrNull()) { 1617 StringLength = NumBytes; 1618 return Map.GetOrCreateValue(String); 1619 } 1620 1621 // Otherwise, convert the UTF8 literals into a byte string. 1622 llvm::SmallVector<UTF16, 128> ToBuf(NumBytes); 1623 const UTF8 *FromPtr = (UTF8 *)String.data(); 1624 UTF16 *ToPtr = &ToBuf[0]; 1625 1626 (void)ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes, 1627 &ToPtr, ToPtr + NumBytes, 1628 strictConversion); 1629 1630 // ConvertUTF8toUTF16 returns the length in ToPtr. 1631 StringLength = ToPtr - &ToBuf[0]; 1632 1633 // Render the UTF-16 string into a byte array and convert to the target byte 1634 // order. 1635 // 1636 // FIXME: This isn't something we should need to do here. 1637 llvm::SmallString<128> AsBytes; 1638 AsBytes.reserve(StringLength * 2); 1639 for (unsigned i = 0; i != StringLength; ++i) { 1640 unsigned short Val = ToBuf[i]; 1641 if (TargetIsLSB) { 1642 AsBytes.push_back(Val & 0xFF); 1643 AsBytes.push_back(Val >> 8); 1644 } else { 1645 AsBytes.push_back(Val >> 8); 1646 AsBytes.push_back(Val & 0xFF); 1647 } 1648 } 1649 // Append one extra null character, the second is automatically added by our 1650 // caller. 1651 AsBytes.push_back(0); 1652 1653 IsUTF16 = true; 1654 return Map.GetOrCreateValue(llvm::StringRef(AsBytes.data(), AsBytes.size())); 1655} 1656 1657static llvm::StringMapEntry<llvm::Constant*> & 1658GetConstantStringEntry(llvm::StringMap<llvm::Constant*> &Map, 1659 const StringLiteral *Literal, 1660 unsigned &StringLength) 1661{ 1662 llvm::StringRef String = Literal->getString(); 1663 StringLength = String.size(); 1664 return Map.GetOrCreateValue(String); 1665} 1666 1667llvm::Constant * 1668CodeGenModule::GetAddrOfConstantCFString(const StringLiteral *Literal) { 1669 unsigned StringLength = 0; 1670 bool isUTF16 = false; 1671 llvm::StringMapEntry<llvm::Constant*> &Entry = 1672 GetConstantCFStringEntry(CFConstantStringMap, Literal, 1673 getTargetData().isLittleEndian(), 1674 isUTF16, StringLength); 1675 1676 if (llvm::Constant *C = Entry.getValue()) 1677 return C; 1678 1679 llvm::Constant *Zero = 1680 llvm::Constant::getNullValue(llvm::Type::getInt32Ty(VMContext)); 1681 llvm::Constant *Zeros[] = { Zero, Zero }; 1682 1683 // If we don't already have it, get __CFConstantStringClassReference. 1684 if (!CFConstantStringClassRef) { 1685 const llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy); 1686 Ty = llvm::ArrayType::get(Ty, 0); 1687 llvm::Constant *GV = CreateRuntimeVariable(Ty, 1688 "__CFConstantStringClassReference"); 1689 // Decay array -> ptr 1690 CFConstantStringClassRef = 1691 llvm::ConstantExpr::getGetElementPtr(GV, Zeros, 2); 1692 } 1693 1694 QualType CFTy = getContext().getCFConstantStringType(); 1695 1696 const llvm::StructType *STy = 1697 cast<llvm::StructType>(getTypes().ConvertType(CFTy)); 1698 1699 std::vector<llvm::Constant*> Fields(4); 1700 1701 // Class pointer. 1702 Fields[0] = CFConstantStringClassRef; 1703 1704 // Flags. 1705 const llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy); 1706 Fields[1] = isUTF16 ? llvm::ConstantInt::get(Ty, 0x07d0) : 1707 llvm::ConstantInt::get(Ty, 0x07C8); 1708 1709 // String pointer. 1710 llvm::Constant *C = llvm::ConstantArray::get(VMContext, Entry.getKey().str()); 1711 1712 llvm::GlobalValue::LinkageTypes Linkage; 1713 bool isConstant; 1714 if (isUTF16) { 1715 // FIXME: why do utf strings get "_" labels instead of "L" labels? 1716 Linkage = llvm::GlobalValue::InternalLinkage; 1717 // Note: -fwritable-strings doesn't make unicode CFStrings writable, but 1718 // does make plain ascii ones writable. 1719 isConstant = true; 1720 } else { 1721 // FIXME: With OS X ld 123.2 (xcode 4) and LTO we would get a linker error 1722 // when using private linkage. It is not clear if this is a bug in ld 1723 // or a reasonable new restriction. 1724 Linkage = llvm::GlobalValue::LinkerPrivateLinkage; 1725 isConstant = !Features.WritableStrings; 1726 } 1727 1728 llvm::GlobalVariable *GV = 1729 new llvm::GlobalVariable(getModule(), C->getType(), isConstant, Linkage, C, 1730 ".str"); 1731 GV->setUnnamedAddr(true); 1732 if (isUTF16) { 1733 CharUnits Align = getContext().getTypeAlignInChars(getContext().ShortTy); 1734 GV->setAlignment(Align.getQuantity()); 1735 } else { 1736 CharUnits Align = getContext().getTypeAlignInChars(getContext().CharTy); 1737 GV->setAlignment(Align.getQuantity()); 1738 } 1739 Fields[2] = llvm::ConstantExpr::getGetElementPtr(GV, Zeros, 2); 1740 1741 // String length. 1742 Ty = getTypes().ConvertType(getContext().LongTy); 1743 Fields[3] = llvm::ConstantInt::get(Ty, StringLength); 1744 1745 // The struct. 1746 C = llvm::ConstantStruct::get(STy, Fields); 1747 GV = new llvm::GlobalVariable(getModule(), C->getType(), true, 1748 llvm::GlobalVariable::PrivateLinkage, C, 1749 "_unnamed_cfstring_"); 1750 if (const char *Sect = getContext().Target.getCFStringSection()) 1751 GV->setSection(Sect); 1752 Entry.setValue(GV); 1753 1754 return GV; 1755} 1756 1757llvm::Constant * 1758CodeGenModule::GetAddrOfConstantString(const StringLiteral *Literal) { 1759 unsigned StringLength = 0; 1760 llvm::StringMapEntry<llvm::Constant*> &Entry = 1761 GetConstantStringEntry(CFConstantStringMap, Literal, StringLength); 1762 1763 if (llvm::Constant *C = Entry.getValue()) 1764 return C; 1765 1766 llvm::Constant *Zero = 1767 llvm::Constant::getNullValue(llvm::Type::getInt32Ty(VMContext)); 1768 llvm::Constant *Zeros[] = { Zero, Zero }; 1769 1770 // If we don't already have it, get _NSConstantStringClassReference. 1771 if (!ConstantStringClassRef) { 1772 std::string StringClass(getLangOptions().ObjCConstantStringClass); 1773 const llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy); 1774 llvm::Constant *GV; 1775 if (Features.ObjCNonFragileABI) { 1776 std::string str = 1777 StringClass.empty() ? "OBJC_CLASS_$_NSConstantString" 1778 : "OBJC_CLASS_$_" + StringClass; 1779 GV = getObjCRuntime().GetClassGlobal(str); 1780 // Make sure the result is of the correct type. 1781 const llvm::Type *PTy = llvm::PointerType::getUnqual(Ty); 1782 ConstantStringClassRef = 1783 llvm::ConstantExpr::getBitCast(GV, PTy); 1784 } else { 1785 std::string str = 1786 StringClass.empty() ? "_NSConstantStringClassReference" 1787 : "_" + StringClass + "ClassReference"; 1788 const llvm::Type *PTy = llvm::ArrayType::get(Ty, 0); 1789 GV = CreateRuntimeVariable(PTy, str); 1790 // Decay array -> ptr 1791 ConstantStringClassRef = 1792 llvm::ConstantExpr::getGetElementPtr(GV, Zeros, 2); 1793 } 1794 } 1795 1796 QualType NSTy = getContext().getNSConstantStringType(); 1797 1798 const llvm::StructType *STy = 1799 cast<llvm::StructType>(getTypes().ConvertType(NSTy)); 1800 1801 std::vector<llvm::Constant*> Fields(3); 1802 1803 // Class pointer. 1804 Fields[0] = ConstantStringClassRef; 1805 1806 // String pointer. 1807 llvm::Constant *C = llvm::ConstantArray::get(VMContext, Entry.getKey().str()); 1808 1809 llvm::GlobalValue::LinkageTypes Linkage; 1810 bool isConstant; 1811 Linkage = llvm::GlobalValue::PrivateLinkage; 1812 isConstant = !Features.WritableStrings; 1813 1814 llvm::GlobalVariable *GV = 1815 new llvm::GlobalVariable(getModule(), C->getType(), isConstant, Linkage, C, 1816 ".str"); 1817 GV->setUnnamedAddr(true); 1818 CharUnits Align = getContext().getTypeAlignInChars(getContext().CharTy); 1819 GV->setAlignment(Align.getQuantity()); 1820 Fields[1] = llvm::ConstantExpr::getGetElementPtr(GV, Zeros, 2); 1821 1822 // String length. 1823 const llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy); 1824 Fields[2] = llvm::ConstantInt::get(Ty, StringLength); 1825 1826 // The struct. 1827 C = llvm::ConstantStruct::get(STy, Fields); 1828 GV = new llvm::GlobalVariable(getModule(), C->getType(), true, 1829 llvm::GlobalVariable::PrivateLinkage, C, 1830 "_unnamed_nsstring_"); 1831 // FIXME. Fix section. 1832 if (const char *Sect = 1833 Features.ObjCNonFragileABI 1834 ? getContext().Target.getNSStringNonFragileABISection() 1835 : getContext().Target.getNSStringSection()) 1836 GV->setSection(Sect); 1837 Entry.setValue(GV); 1838 1839 return GV; 1840} 1841 1842/// GetStringForStringLiteral - Return the appropriate bytes for a 1843/// string literal, properly padded to match the literal type. 1844std::string CodeGenModule::GetStringForStringLiteral(const StringLiteral *E) { 1845 const ASTContext &Context = getContext(); 1846 const ConstantArrayType *CAT = 1847 Context.getAsConstantArrayType(E->getType()); 1848 assert(CAT && "String isn't pointer or array!"); 1849 1850 // Resize the string to the right size. 1851 uint64_t RealLen = CAT->getSize().getZExtValue(); 1852 1853 if (E->isWide()) 1854 RealLen *= Context.Target.getWCharWidth() / Context.getCharWidth(); 1855 1856 std::string Str = E->getString().str(); 1857 Str.resize(RealLen, '\0'); 1858 1859 return Str; 1860} 1861 1862/// GetAddrOfConstantStringFromLiteral - Return a pointer to a 1863/// constant array for the given string literal. 1864llvm::Constant * 1865CodeGenModule::GetAddrOfConstantStringFromLiteral(const StringLiteral *S) { 1866 // FIXME: This can be more efficient. 1867 // FIXME: We shouldn't need to bitcast the constant in the wide string case. 1868 llvm::Constant *C = GetAddrOfConstantString(GetStringForStringLiteral(S)); 1869 if (S->isWide()) { 1870 llvm::Type *DestTy = 1871 llvm::PointerType::getUnqual(getTypes().ConvertType(S->getType())); 1872 C = llvm::ConstantExpr::getBitCast(C, DestTy); 1873 } 1874 return C; 1875} 1876 1877/// GetAddrOfConstantStringFromObjCEncode - Return a pointer to a constant 1878/// array for the given ObjCEncodeExpr node. 1879llvm::Constant * 1880CodeGenModule::GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *E) { 1881 std::string Str; 1882 getContext().getObjCEncodingForType(E->getEncodedType(), Str); 1883 1884 return GetAddrOfConstantCString(Str); 1885} 1886 1887 1888/// GenerateWritableString -- Creates storage for a string literal. 1889static llvm::Constant *GenerateStringLiteral(llvm::StringRef str, 1890 bool constant, 1891 CodeGenModule &CGM, 1892 const char *GlobalName) { 1893 // Create Constant for this string literal. Don't add a '\0'. 1894 llvm::Constant *C = 1895 llvm::ConstantArray::get(CGM.getLLVMContext(), str, false); 1896 1897 // Create a global variable for this string 1898 llvm::GlobalVariable *GV = 1899 new llvm::GlobalVariable(CGM.getModule(), C->getType(), constant, 1900 llvm::GlobalValue::PrivateLinkage, 1901 C, GlobalName); 1902 GV->setAlignment(1); 1903 GV->setUnnamedAddr(true); 1904 return GV; 1905} 1906 1907/// GetAddrOfConstantString - Returns a pointer to a character array 1908/// containing the literal. This contents are exactly that of the 1909/// given string, i.e. it will not be null terminated automatically; 1910/// see GetAddrOfConstantCString. Note that whether the result is 1911/// actually a pointer to an LLVM constant depends on 1912/// Feature.WriteableStrings. 1913/// 1914/// The result has pointer to array type. 1915llvm::Constant *CodeGenModule::GetAddrOfConstantString(llvm::StringRef Str, 1916 const char *GlobalName) { 1917 bool IsConstant = !Features.WritableStrings; 1918 1919 // Get the default prefix if a name wasn't specified. 1920 if (!GlobalName) 1921 GlobalName = ".str"; 1922 1923 // Don't share any string literals if strings aren't constant. 1924 if (!IsConstant) 1925 return GenerateStringLiteral(Str, false, *this, GlobalName); 1926 1927 llvm::StringMapEntry<llvm::Constant *> &Entry = 1928 ConstantStringMap.GetOrCreateValue(Str); 1929 1930 if (Entry.getValue()) 1931 return Entry.getValue(); 1932 1933 // Create a global variable for this. 1934 llvm::Constant *C = GenerateStringLiteral(Str, true, *this, GlobalName); 1935 Entry.setValue(C); 1936 return C; 1937} 1938 1939/// GetAddrOfConstantCString - Returns a pointer to a character 1940/// array containing the literal and a terminating '\0' 1941/// character. The result has pointer to array type. 1942llvm::Constant *CodeGenModule::GetAddrOfConstantCString(const std::string &Str, 1943 const char *GlobalName){ 1944 llvm::StringRef StrWithNull(Str.c_str(), Str.size() + 1); 1945 return GetAddrOfConstantString(StrWithNull, GlobalName); 1946} 1947 1948/// EmitObjCPropertyImplementations - Emit information for synthesized 1949/// properties for an implementation. 1950void CodeGenModule::EmitObjCPropertyImplementations(const 1951 ObjCImplementationDecl *D) { 1952 for (ObjCImplementationDecl::propimpl_iterator 1953 i = D->propimpl_begin(), e = D->propimpl_end(); i != e; ++i) { 1954 ObjCPropertyImplDecl *PID = *i; 1955 1956 // Dynamic is just for type-checking. 1957 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) { 1958 ObjCPropertyDecl *PD = PID->getPropertyDecl(); 1959 1960 // Determine which methods need to be implemented, some may have 1961 // been overridden. Note that ::isSynthesized is not the method 1962 // we want, that just indicates if the decl came from a 1963 // property. What we want to know is if the method is defined in 1964 // this implementation. 1965 if (!D->getInstanceMethod(PD->getGetterName())) 1966 CodeGenFunction(*this).GenerateObjCGetter( 1967 const_cast<ObjCImplementationDecl *>(D), PID); 1968 if (!PD->isReadOnly() && 1969 !D->getInstanceMethod(PD->getSetterName())) 1970 CodeGenFunction(*this).GenerateObjCSetter( 1971 const_cast<ObjCImplementationDecl *>(D), PID); 1972 } 1973 } 1974} 1975 1976static bool needsDestructMethod(ObjCImplementationDecl *impl) { 1977 ObjCInterfaceDecl *iface 1978 = const_cast<ObjCInterfaceDecl*>(impl->getClassInterface()); 1979 for (ObjCIvarDecl *ivar = iface->all_declared_ivar_begin(); 1980 ivar; ivar = ivar->getNextIvar()) 1981 if (ivar->getType().isDestructedType()) 1982 return true; 1983 1984 return false; 1985} 1986 1987/// EmitObjCIvarInitializations - Emit information for ivar initialization 1988/// for an implementation. 1989void CodeGenModule::EmitObjCIvarInitializations(ObjCImplementationDecl *D) { 1990 // We might need a .cxx_destruct even if we don't have any ivar initializers. 1991 if (needsDestructMethod(D)) { 1992 IdentifierInfo *II = &getContext().Idents.get(".cxx_destruct"); 1993 Selector cxxSelector = getContext().Selectors.getSelector(0, &II); 1994 ObjCMethodDecl *DTORMethod = 1995 ObjCMethodDecl::Create(getContext(), D->getLocation(), D->getLocation(), 1996 cxxSelector, getContext().VoidTy, 0, D, true, 1997 false, true, false, ObjCMethodDecl::Required); 1998 D->addInstanceMethod(DTORMethod); 1999 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, DTORMethod, false); 2000 } 2001 2002 // If the implementation doesn't have any ivar initializers, we don't need 2003 // a .cxx_construct. 2004 if (D->getNumIvarInitializers() == 0) 2005 return; 2006 2007 IdentifierInfo *II = &getContext().Idents.get(".cxx_construct"); 2008 Selector cxxSelector = getContext().Selectors.getSelector(0, &II); 2009 // The constructor returns 'self'. 2010 ObjCMethodDecl *CTORMethod = ObjCMethodDecl::Create(getContext(), 2011 D->getLocation(), 2012 D->getLocation(), cxxSelector, 2013 getContext().getObjCIdType(), 0, 2014 D, true, false, true, false, 2015 ObjCMethodDecl::Required); 2016 D->addInstanceMethod(CTORMethod); 2017 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, CTORMethod, true); 2018} 2019 2020/// EmitNamespace - Emit all declarations in a namespace. 2021void CodeGenModule::EmitNamespace(const NamespaceDecl *ND) { 2022 for (RecordDecl::decl_iterator I = ND->decls_begin(), E = ND->decls_end(); 2023 I != E; ++I) 2024 EmitTopLevelDecl(*I); 2025} 2026 2027// EmitLinkageSpec - Emit all declarations in a linkage spec. 2028void CodeGenModule::EmitLinkageSpec(const LinkageSpecDecl *LSD) { 2029 if (LSD->getLanguage() != LinkageSpecDecl::lang_c && 2030 LSD->getLanguage() != LinkageSpecDecl::lang_cxx) { 2031 ErrorUnsupported(LSD, "linkage spec"); 2032 return; 2033 } 2034 2035 for (RecordDecl::decl_iterator I = LSD->decls_begin(), E = LSD->decls_end(); 2036 I != E; ++I) 2037 EmitTopLevelDecl(*I); 2038} 2039 2040/// EmitTopLevelDecl - Emit code for a single top level declaration. 2041void CodeGenModule::EmitTopLevelDecl(Decl *D) { 2042 // If an error has occurred, stop code generation, but continue 2043 // parsing and semantic analysis (to ensure all warnings and errors 2044 // are emitted). 2045 if (Diags.hasErrorOccurred()) 2046 return; 2047 2048 // Ignore dependent declarations. 2049 if (D->getDeclContext() && D->getDeclContext()->isDependentContext()) 2050 return; 2051 2052 switch (D->getKind()) { 2053 case Decl::CXXConversion: 2054 case Decl::CXXMethod: 2055 case Decl::Function: 2056 // Skip function templates 2057 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() || 2058 cast<FunctionDecl>(D)->isLateTemplateParsed()) 2059 return; 2060 2061 EmitGlobal(cast<FunctionDecl>(D)); 2062 break; 2063 2064 case Decl::Var: 2065 EmitGlobal(cast<VarDecl>(D)); 2066 break; 2067 2068 // Indirect fields from global anonymous structs and unions can be 2069 // ignored; only the actual variable requires IR gen support. 2070 case Decl::IndirectField: 2071 break; 2072 2073 // C++ Decls 2074 case Decl::Namespace: 2075 EmitNamespace(cast<NamespaceDecl>(D)); 2076 break; 2077 // No code generation needed. 2078 case Decl::UsingShadow: 2079 case Decl::Using: 2080 case Decl::UsingDirective: 2081 case Decl::ClassTemplate: 2082 case Decl::FunctionTemplate: 2083 case Decl::TypeAliasTemplate: 2084 case Decl::NamespaceAlias: 2085 case Decl::Block: 2086 break; 2087 case Decl::CXXConstructor: 2088 // Skip function templates 2089 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() || 2090 cast<FunctionDecl>(D)->isLateTemplateParsed()) 2091 return; 2092 2093 EmitCXXConstructors(cast<CXXConstructorDecl>(D)); 2094 break; 2095 case Decl::CXXDestructor: 2096 if (cast<FunctionDecl>(D)->isLateTemplateParsed()) 2097 return; 2098 EmitCXXDestructors(cast<CXXDestructorDecl>(D)); 2099 break; 2100 2101 case Decl::StaticAssert: 2102 // Nothing to do. 2103 break; 2104 2105 // Objective-C Decls 2106 2107 // Forward declarations, no (immediate) code generation. 2108 case Decl::ObjCClass: 2109 case Decl::ObjCForwardProtocol: 2110 case Decl::ObjCInterface: 2111 break; 2112 2113 case Decl::ObjCCategory: { 2114 ObjCCategoryDecl *CD = cast<ObjCCategoryDecl>(D); 2115 if (CD->IsClassExtension() && CD->hasSynthBitfield()) 2116 Context.ResetObjCLayout(CD->getClassInterface()); 2117 break; 2118 } 2119 2120 case Decl::ObjCProtocol: 2121 Runtime->GenerateProtocol(cast<ObjCProtocolDecl>(D)); 2122 break; 2123 2124 case Decl::ObjCCategoryImpl: 2125 // Categories have properties but don't support synthesize so we 2126 // can ignore them here. 2127 Runtime->GenerateCategory(cast<ObjCCategoryImplDecl>(D)); 2128 break; 2129 2130 case Decl::ObjCImplementation: { 2131 ObjCImplementationDecl *OMD = cast<ObjCImplementationDecl>(D); 2132 if (Features.ObjCNonFragileABI2 && OMD->hasSynthBitfield()) 2133 Context.ResetObjCLayout(OMD->getClassInterface()); 2134 EmitObjCPropertyImplementations(OMD); 2135 EmitObjCIvarInitializations(OMD); 2136 Runtime->GenerateClass(OMD); 2137 break; 2138 } 2139 case Decl::ObjCMethod: { 2140 ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(D); 2141 // If this is not a prototype, emit the body. 2142 if (OMD->getBody()) 2143 CodeGenFunction(*this).GenerateObjCMethod(OMD); 2144 break; 2145 } 2146 case Decl::ObjCCompatibleAlias: 2147 // compatibility-alias is a directive and has no code gen. 2148 break; 2149 2150 case Decl::LinkageSpec: 2151 EmitLinkageSpec(cast<LinkageSpecDecl>(D)); 2152 break; 2153 2154 case Decl::FileScopeAsm: { 2155 FileScopeAsmDecl *AD = cast<FileScopeAsmDecl>(D); 2156 llvm::StringRef AsmString = AD->getAsmString()->getString(); 2157 2158 const std::string &S = getModule().getModuleInlineAsm(); 2159 if (S.empty()) 2160 getModule().setModuleInlineAsm(AsmString); 2161 else 2162 getModule().setModuleInlineAsm(S + '\n' + AsmString.str()); 2163 break; 2164 } 2165 2166 default: 2167 // Make sure we handled everything we should, every other kind is a 2168 // non-top-level decl. FIXME: Would be nice to have an isTopLevelDeclKind 2169 // function. Need to recode Decl::Kind to do that easily. 2170 assert(isa<TypeDecl>(D) && "Unsupported decl kind"); 2171 } 2172} 2173 2174/// Turns the given pointer into a constant. 2175static llvm::Constant *GetPointerConstant(llvm::LLVMContext &Context, 2176 const void *Ptr) { 2177 uintptr_t PtrInt = reinterpret_cast<uintptr_t>(Ptr); 2178 const llvm::Type *i64 = llvm::Type::getInt64Ty(Context); 2179 return llvm::ConstantInt::get(i64, PtrInt); 2180} 2181 2182static void EmitGlobalDeclMetadata(CodeGenModule &CGM, 2183 llvm::NamedMDNode *&GlobalMetadata, 2184 GlobalDecl D, 2185 llvm::GlobalValue *Addr) { 2186 if (!GlobalMetadata) 2187 GlobalMetadata = 2188 CGM.getModule().getOrInsertNamedMetadata("clang.global.decl.ptrs"); 2189 2190 // TODO: should we report variant information for ctors/dtors? 2191 llvm::Value *Ops[] = { 2192 Addr, 2193 GetPointerConstant(CGM.getLLVMContext(), D.getDecl()) 2194 }; 2195 GlobalMetadata->addOperand(llvm::MDNode::get(CGM.getLLVMContext(), Ops)); 2196} 2197 2198/// Emits metadata nodes associating all the global values in the 2199/// current module with the Decls they came from. This is useful for 2200/// projects using IR gen as a subroutine. 2201/// 2202/// Since there's currently no way to associate an MDNode directly 2203/// with an llvm::GlobalValue, we create a global named metadata 2204/// with the name 'clang.global.decl.ptrs'. 2205void CodeGenModule::EmitDeclMetadata() { 2206 llvm::NamedMDNode *GlobalMetadata = 0; 2207 2208 // StaticLocalDeclMap 2209 for (llvm::DenseMap<GlobalDecl,llvm::StringRef>::iterator 2210 I = MangledDeclNames.begin(), E = MangledDeclNames.end(); 2211 I != E; ++I) { 2212 llvm::GlobalValue *Addr = getModule().getNamedValue(I->second); 2213 EmitGlobalDeclMetadata(*this, GlobalMetadata, I->first, Addr); 2214 } 2215} 2216 2217/// Emits metadata nodes for all the local variables in the current 2218/// function. 2219void CodeGenFunction::EmitDeclMetadata() { 2220 if (LocalDeclMap.empty()) return; 2221 2222 llvm::LLVMContext &Context = getLLVMContext(); 2223 2224 // Find the unique metadata ID for this name. 2225 unsigned DeclPtrKind = Context.getMDKindID("clang.decl.ptr"); 2226 2227 llvm::NamedMDNode *GlobalMetadata = 0; 2228 2229 for (llvm::DenseMap<const Decl*, llvm::Value*>::iterator 2230 I = LocalDeclMap.begin(), E = LocalDeclMap.end(); I != E; ++I) { 2231 const Decl *D = I->first; 2232 llvm::Value *Addr = I->second; 2233 2234 if (llvm::AllocaInst *Alloca = dyn_cast<llvm::AllocaInst>(Addr)) { 2235 llvm::Value *DAddr = GetPointerConstant(getLLVMContext(), D); 2236 Alloca->setMetadata(DeclPtrKind, llvm::MDNode::get(Context, DAddr)); 2237 } else if (llvm::GlobalValue *GV = dyn_cast<llvm::GlobalValue>(Addr)) { 2238 GlobalDecl GD = GlobalDecl(cast<VarDecl>(D)); 2239 EmitGlobalDeclMetadata(CGM, GlobalMetadata, GD, GV); 2240 } 2241 } 2242} 2243 2244void CodeGenModule::EmitCoverageFile() { 2245 if (!getCodeGenOpts().CoverageFile.empty()) { 2246 if (llvm::NamedMDNode *CUNode = TheModule.getNamedMetadata("llvm.dbg.cu")) { 2247 llvm::NamedMDNode *GCov = TheModule.getOrInsertNamedMetadata("llvm.gcov"); 2248 llvm::LLVMContext &Ctx = TheModule.getContext(); 2249 llvm::MDString *CoverageFile = 2250 llvm::MDString::get(Ctx, getCodeGenOpts().CoverageFile); 2251 for (int i = 0, e = CUNode->getNumOperands(); i != e; ++i) { 2252 llvm::MDNode *CU = CUNode->getOperand(i); 2253 llvm::Value *node[] = { CoverageFile, CU }; 2254 llvm::MDNode *N = llvm::MDNode::get(Ctx, node); 2255 GCov->addOperand(N); 2256 } 2257 } 2258 } 2259} 2260 2261///@name Custom Runtime Function Interfaces 2262///@{ 2263// 2264// FIXME: These can be eliminated once we can have clients just get the required 2265// AST nodes from the builtin tables. 2266 2267llvm::Constant *CodeGenModule::getBlockObjectDispose() { 2268 if (BlockObjectDispose) 2269 return BlockObjectDispose; 2270 2271 // If we saw an explicit decl, use that. 2272 if (BlockObjectDisposeDecl) { 2273 return BlockObjectDispose = GetAddrOfFunction( 2274 BlockObjectDisposeDecl, 2275 getTypes().GetFunctionType(BlockObjectDisposeDecl)); 2276 } 2277 2278 // Otherwise construct the function by hand. 2279 const llvm::Type *args[] = { Int8PtrTy, Int32Ty }; 2280 const llvm::FunctionType *fty 2281 = llvm::FunctionType::get(VoidTy, args, false); 2282 return BlockObjectDispose = 2283 CreateRuntimeFunction(fty, "_Block_object_dispose"); 2284} 2285 2286llvm::Constant *CodeGenModule::getBlockObjectAssign() { 2287 if (BlockObjectAssign) 2288 return BlockObjectAssign; 2289 2290 // If we saw an explicit decl, use that. 2291 if (BlockObjectAssignDecl) { 2292 return BlockObjectAssign = GetAddrOfFunction( 2293 BlockObjectAssignDecl, 2294 getTypes().GetFunctionType(BlockObjectAssignDecl)); 2295 } 2296 2297 // Otherwise construct the function by hand. 2298 const llvm::Type *args[] = { Int8PtrTy, Int8PtrTy, Int32Ty }; 2299 const llvm::FunctionType *fty 2300 = llvm::FunctionType::get(VoidTy, args, false); 2301 return BlockObjectAssign = 2302 CreateRuntimeFunction(fty, "_Block_object_assign"); 2303} 2304 2305llvm::Constant *CodeGenModule::getNSConcreteGlobalBlock() { 2306 if (NSConcreteGlobalBlock) 2307 return NSConcreteGlobalBlock; 2308 2309 // If we saw an explicit decl, use that. 2310 if (NSConcreteGlobalBlockDecl) { 2311 return NSConcreteGlobalBlock = GetAddrOfGlobalVar( 2312 NSConcreteGlobalBlockDecl, 2313 getTypes().ConvertType(NSConcreteGlobalBlockDecl->getType())); 2314 } 2315 2316 // Otherwise construct the variable by hand. 2317 return NSConcreteGlobalBlock = 2318 CreateRuntimeVariable(Int8PtrTy, "_NSConcreteGlobalBlock"); 2319} 2320 2321llvm::Constant *CodeGenModule::getNSConcreteStackBlock() { 2322 if (NSConcreteStackBlock) 2323 return NSConcreteStackBlock; 2324 2325 // If we saw an explicit decl, use that. 2326 if (NSConcreteStackBlockDecl) { 2327 return NSConcreteStackBlock = GetAddrOfGlobalVar( 2328 NSConcreteStackBlockDecl, 2329 getTypes().ConvertType(NSConcreteStackBlockDecl->getType())); 2330 } 2331 2332 // Otherwise construct the variable by hand. 2333 return NSConcreteStackBlock = 2334 CreateRuntimeVariable(Int8PtrTy, "_NSConcreteStackBlock"); 2335} 2336 2337///@} 2338