CodeGenModule.cpp revision 224145
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, CGO), 66 TBAA(0), 67 VTables(*this), Runtime(0), DebugInfo(0), ARCData(0), RRData(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 if (C.getLangOptions().ObjCAutoRefCount) 92 ARCData = new ARCEntrypoints(); 93 RRData = new RREntrypoints(); 94 95 // Initialize the type cache. 96 llvm::LLVMContext &LLVMContext = M.getContext(); 97 VoidTy = llvm::Type::getVoidTy(LLVMContext); 98 Int8Ty = llvm::Type::getInt8Ty(LLVMContext); 99 Int32Ty = llvm::Type::getInt32Ty(LLVMContext); 100 Int64Ty = llvm::Type::getInt64Ty(LLVMContext); 101 PointerWidthInBits = C.Target.getPointerWidth(0); 102 PointerAlignInBytes = 103 C.toCharUnitsFromBits(C.Target.getPointerAlign(0)).getQuantity(); 104 IntTy = llvm::IntegerType::get(LLVMContext, C.Target.getIntWidth()); 105 IntPtrTy = llvm::IntegerType::get(LLVMContext, PointerWidthInBits); 106 Int8PtrTy = Int8Ty->getPointerTo(0); 107 Int8PtrPtrTy = Int8PtrTy->getPointerTo(0); 108} 109 110CodeGenModule::~CodeGenModule() { 111 delete Runtime; 112 delete &ABI; 113 delete TBAA; 114 delete DebugInfo; 115 delete ARCData; 116 delete RRData; 117} 118 119void CodeGenModule::createObjCRuntime() { 120 if (!Features.NeXTRuntime) 121 Runtime = CreateGNUObjCRuntime(*this); 122 else 123 Runtime = CreateMacObjCRuntime(*this); 124} 125 126void CodeGenModule::Release() { 127 EmitDeferred(); 128 EmitCXXGlobalInitFunc(); 129 EmitCXXGlobalDtorFunc(); 130 if (Runtime) 131 if (llvm::Function *ObjCInitFunction = Runtime->ModuleInitFunction()) 132 AddGlobalCtor(ObjCInitFunction); 133 EmitCtorList(GlobalCtors, "llvm.global_ctors"); 134 EmitCtorList(GlobalDtors, "llvm.global_dtors"); 135 EmitAnnotations(); 136 EmitLLVMUsed(); 137 138 SimplifyPersonality(); 139 140 if (getCodeGenOpts().EmitDeclMetadata) 141 EmitDeclMetadata(); 142 143 if (getCodeGenOpts().EmitGcovArcs || getCodeGenOpts().EmitGcovNotes) 144 EmitCoverageFile(); 145} 146 147void CodeGenModule::UpdateCompletedType(const TagDecl *TD) { 148 // Make sure that this type is translated. 149 Types.UpdateCompletedType(TD); 150 if (DebugInfo) 151 DebugInfo->UpdateCompletedType(TD); 152} 153 154llvm::MDNode *CodeGenModule::getTBAAInfo(QualType QTy) { 155 if (!TBAA) 156 return 0; 157 return TBAA->getTBAAInfo(QTy); 158} 159 160void CodeGenModule::DecorateInstruction(llvm::Instruction *Inst, 161 llvm::MDNode *TBAAInfo) { 162 Inst->setMetadata(llvm::LLVMContext::MD_tbaa, TBAAInfo); 163} 164 165bool CodeGenModule::isTargetDarwin() const { 166 return getContext().Target.getTriple().isOSDarwin(); 167} 168 169void CodeGenModule::Error(SourceLocation loc, llvm::StringRef error) { 170 unsigned diagID = getDiags().getCustomDiagID(Diagnostic::Error, error); 171 getDiags().Report(Context.getFullLoc(loc), diagID); 172} 173 174/// ErrorUnsupported - Print out an error that codegen doesn't support the 175/// specified stmt yet. 176void CodeGenModule::ErrorUnsupported(const Stmt *S, const char *Type, 177 bool OmitOnError) { 178 if (OmitOnError && getDiags().hasErrorOccurred()) 179 return; 180 unsigned DiagID = getDiags().getCustomDiagID(Diagnostic::Error, 181 "cannot compile this %0 yet"); 182 std::string Msg = Type; 183 getDiags().Report(Context.getFullLoc(S->getLocStart()), DiagID) 184 << Msg << S->getSourceRange(); 185} 186 187/// ErrorUnsupported - Print out an error that codegen doesn't support the 188/// specified decl yet. 189void CodeGenModule::ErrorUnsupported(const Decl *D, const char *Type, 190 bool OmitOnError) { 191 if (OmitOnError && getDiags().hasErrorOccurred()) 192 return; 193 unsigned DiagID = getDiags().getCustomDiagID(Diagnostic::Error, 194 "cannot compile this %0 yet"); 195 std::string Msg = Type; 196 getDiags().Report(Context.getFullLoc(D->getLocation()), DiagID) << Msg; 197} 198 199llvm::ConstantInt *CodeGenModule::getSize(CharUnits size) { 200 return llvm::ConstantInt::get(SizeTy, size.getQuantity()); 201} 202 203void CodeGenModule::setGlobalVisibility(llvm::GlobalValue *GV, 204 const NamedDecl *D) const { 205 // Internal definitions always have default visibility. 206 if (GV->hasLocalLinkage()) { 207 GV->setVisibility(llvm::GlobalValue::DefaultVisibility); 208 return; 209 } 210 211 // Set visibility for definitions. 212 NamedDecl::LinkageInfo LV = D->getLinkageAndVisibility(); 213 if (LV.visibilityExplicit() || !GV->hasAvailableExternallyLinkage()) 214 GV->setVisibility(GetLLVMVisibility(LV.visibility())); 215} 216 217/// Set the symbol visibility of type information (vtable and RTTI) 218/// associated with the given type. 219void CodeGenModule::setTypeVisibility(llvm::GlobalValue *GV, 220 const CXXRecordDecl *RD, 221 TypeVisibilityKind TVK) const { 222 setGlobalVisibility(GV, RD); 223 224 if (!CodeGenOpts.HiddenWeakVTables) 225 return; 226 227 // We never want to drop the visibility for RTTI names. 228 if (TVK == TVK_ForRTTIName) 229 return; 230 231 // We want to drop the visibility to hidden for weak type symbols. 232 // This isn't possible if there might be unresolved references 233 // elsewhere that rely on this symbol being visible. 234 235 // This should be kept roughly in sync with setThunkVisibility 236 // in CGVTables.cpp. 237 238 // Preconditions. 239 if (GV->getLinkage() != llvm::GlobalVariable::LinkOnceODRLinkage || 240 GV->getVisibility() != llvm::GlobalVariable::DefaultVisibility) 241 return; 242 243 // Don't override an explicit visibility attribute. 244 if (RD->getExplicitVisibility()) 245 return; 246 247 switch (RD->getTemplateSpecializationKind()) { 248 // We have to disable the optimization if this is an EI definition 249 // because there might be EI declarations in other shared objects. 250 case TSK_ExplicitInstantiationDefinition: 251 case TSK_ExplicitInstantiationDeclaration: 252 return; 253 254 // Every use of a non-template class's type information has to emit it. 255 case TSK_Undeclared: 256 break; 257 258 // In theory, implicit instantiations can ignore the possibility of 259 // an explicit instantiation declaration because there necessarily 260 // must be an EI definition somewhere with default visibility. In 261 // practice, it's possible to have an explicit instantiation for 262 // an arbitrary template class, and linkers aren't necessarily able 263 // to deal with mixed-visibility symbols. 264 case TSK_ExplicitSpecialization: 265 case TSK_ImplicitInstantiation: 266 if (!CodeGenOpts.HiddenWeakTemplateVTables) 267 return; 268 break; 269 } 270 271 // If there's a key function, there may be translation units 272 // that don't have the key function's definition. But ignore 273 // this if we're emitting RTTI under -fno-rtti. 274 if (!(TVK != TVK_ForRTTI) || Features.RTTI) { 275 if (Context.getKeyFunction(RD)) 276 return; 277 } 278 279 // Otherwise, drop the visibility to hidden. 280 GV->setVisibility(llvm::GlobalValue::HiddenVisibility); 281 GV->setUnnamedAddr(true); 282} 283 284llvm::StringRef CodeGenModule::getMangledName(GlobalDecl GD) { 285 const NamedDecl *ND = cast<NamedDecl>(GD.getDecl()); 286 287 llvm::StringRef &Str = MangledDeclNames[GD.getCanonicalDecl()]; 288 if (!Str.empty()) 289 return Str; 290 291 if (!getCXXABI().getMangleContext().shouldMangleDeclName(ND)) { 292 IdentifierInfo *II = ND->getIdentifier(); 293 assert(II && "Attempt to mangle unnamed decl."); 294 295 Str = II->getName(); 296 return Str; 297 } 298 299 llvm::SmallString<256> Buffer; 300 llvm::raw_svector_ostream Out(Buffer); 301 if (const CXXConstructorDecl *D = dyn_cast<CXXConstructorDecl>(ND)) 302 getCXXABI().getMangleContext().mangleCXXCtor(D, GD.getCtorType(), Out); 303 else if (const CXXDestructorDecl *D = dyn_cast<CXXDestructorDecl>(ND)) 304 getCXXABI().getMangleContext().mangleCXXDtor(D, GD.getDtorType(), Out); 305 else if (const BlockDecl *BD = dyn_cast<BlockDecl>(ND)) 306 getCXXABI().getMangleContext().mangleBlock(BD, Out); 307 else 308 getCXXABI().getMangleContext().mangleName(ND, Out); 309 310 // Allocate space for the mangled name. 311 Out.flush(); 312 size_t Length = Buffer.size(); 313 char *Name = MangledNamesAllocator.Allocate<char>(Length); 314 std::copy(Buffer.begin(), Buffer.end(), Name); 315 316 Str = llvm::StringRef(Name, Length); 317 318 return Str; 319} 320 321void CodeGenModule::getBlockMangledName(GlobalDecl GD, MangleBuffer &Buffer, 322 const BlockDecl *BD) { 323 MangleContext &MangleCtx = getCXXABI().getMangleContext(); 324 const Decl *D = GD.getDecl(); 325 llvm::raw_svector_ostream Out(Buffer.getBuffer()); 326 if (D == 0) 327 MangleCtx.mangleGlobalBlock(BD, Out); 328 else if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 329 MangleCtx.mangleCtorBlock(CD, GD.getCtorType(), BD, Out); 330 else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(D)) 331 MangleCtx.mangleDtorBlock(DD, GD.getDtorType(), BD, Out); 332 else 333 MangleCtx.mangleBlock(cast<DeclContext>(D), BD, Out); 334} 335 336llvm::GlobalValue *CodeGenModule::GetGlobalValue(llvm::StringRef Name) { 337 return getModule().getNamedValue(Name); 338} 339 340/// AddGlobalCtor - Add a function to the list that will be called before 341/// main() runs. 342void CodeGenModule::AddGlobalCtor(llvm::Function * Ctor, int Priority) { 343 // FIXME: Type coercion of void()* types. 344 GlobalCtors.push_back(std::make_pair(Ctor, Priority)); 345} 346 347/// AddGlobalDtor - Add a function to the list that will be called 348/// when the module is unloaded. 349void CodeGenModule::AddGlobalDtor(llvm::Function * Dtor, int Priority) { 350 // FIXME: Type coercion of void()* types. 351 GlobalDtors.push_back(std::make_pair(Dtor, Priority)); 352} 353 354void CodeGenModule::EmitCtorList(const CtorList &Fns, const char *GlobalName) { 355 // Ctor function type is void()*. 356 llvm::FunctionType* CtorFTy = llvm::FunctionType::get(VoidTy, false); 357 llvm::Type *CtorPFTy = llvm::PointerType::getUnqual(CtorFTy); 358 359 // Get the type of a ctor entry, { i32, void ()* }. 360 llvm::StructType *CtorStructTy = 361 llvm::StructType::get(llvm::Type::getInt32Ty(VMContext), 362 llvm::PointerType::getUnqual(CtorFTy), NULL); 363 364 // Construct the constructor and destructor arrays. 365 std::vector<llvm::Constant*> Ctors; 366 for (CtorList::const_iterator I = Fns.begin(), E = Fns.end(); I != E; ++I) { 367 std::vector<llvm::Constant*> S; 368 S.push_back(llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), 369 I->second, false)); 370 S.push_back(llvm::ConstantExpr::getBitCast(I->first, CtorPFTy)); 371 Ctors.push_back(llvm::ConstantStruct::get(CtorStructTy, S)); 372 } 373 374 if (!Ctors.empty()) { 375 llvm::ArrayType *AT = llvm::ArrayType::get(CtorStructTy, Ctors.size()); 376 new llvm::GlobalVariable(TheModule, AT, false, 377 llvm::GlobalValue::AppendingLinkage, 378 llvm::ConstantArray::get(AT, Ctors), 379 GlobalName); 380 } 381} 382 383void CodeGenModule::EmitAnnotations() { 384 if (Annotations.empty()) 385 return; 386 387 // Create a new global variable for the ConstantStruct in the Module. 388 llvm::Constant *Array = 389 llvm::ConstantArray::get(llvm::ArrayType::get(Annotations[0]->getType(), 390 Annotations.size()), 391 Annotations); 392 llvm::GlobalValue *gv = 393 new llvm::GlobalVariable(TheModule, Array->getType(), false, 394 llvm::GlobalValue::AppendingLinkage, Array, 395 "llvm.global.annotations"); 396 gv->setSection("llvm.metadata"); 397} 398 399llvm::GlobalValue::LinkageTypes 400CodeGenModule::getFunctionLinkage(const FunctionDecl *D) { 401 GVALinkage Linkage = getContext().GetGVALinkageForFunction(D); 402 403 if (Linkage == GVA_Internal) 404 return llvm::Function::InternalLinkage; 405 406 if (D->hasAttr<DLLExportAttr>()) 407 return llvm::Function::DLLExportLinkage; 408 409 if (D->hasAttr<WeakAttr>()) 410 return llvm::Function::WeakAnyLinkage; 411 412 // In C99 mode, 'inline' functions are guaranteed to have a strong 413 // definition somewhere else, so we can use available_externally linkage. 414 if (Linkage == GVA_C99Inline) 415 return llvm::Function::AvailableExternallyLinkage; 416 417 // In C++, the compiler has to emit a definition in every translation unit 418 // that references the function. We should use linkonce_odr because 419 // a) if all references in this translation unit are optimized away, we 420 // don't need to codegen it. b) if the function persists, it needs to be 421 // merged with other definitions. c) C++ has the ODR, so we know the 422 // definition is dependable. 423 if (Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation) 424 return !Context.getLangOptions().AppleKext 425 ? llvm::Function::LinkOnceODRLinkage 426 : llvm::Function::InternalLinkage; 427 428 // An explicit instantiation of a template has weak linkage, since 429 // explicit instantiations can occur in multiple translation units 430 // and must all be equivalent. However, we are not allowed to 431 // throw away these explicit instantiations. 432 if (Linkage == GVA_ExplicitTemplateInstantiation) 433 return !Context.getLangOptions().AppleKext 434 ? llvm::Function::WeakODRLinkage 435 : llvm::Function::InternalLinkage; 436 437 // Otherwise, we have strong external linkage. 438 assert(Linkage == GVA_StrongExternal); 439 return llvm::Function::ExternalLinkage; 440} 441 442 443/// SetFunctionDefinitionAttributes - Set attributes for a global. 444/// 445/// FIXME: This is currently only done for aliases and functions, but not for 446/// variables (these details are set in EmitGlobalVarDefinition for variables). 447void CodeGenModule::SetFunctionDefinitionAttributes(const FunctionDecl *D, 448 llvm::GlobalValue *GV) { 449 SetCommonAttributes(D, GV); 450} 451 452void CodeGenModule::SetLLVMFunctionAttributes(const Decl *D, 453 const CGFunctionInfo &Info, 454 llvm::Function *F) { 455 unsigned CallingConv; 456 AttributeListType AttributeList; 457 ConstructAttributeList(Info, D, AttributeList, CallingConv); 458 F->setAttributes(llvm::AttrListPtr::get(AttributeList.begin(), 459 AttributeList.size())); 460 F->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv)); 461} 462 463void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D, 464 llvm::Function *F) { 465 if (CodeGenOpts.UnwindTables) 466 F->setHasUWTable(); 467 468 if (!Features.Exceptions && !Features.ObjCNonFragileABI) 469 F->addFnAttr(llvm::Attribute::NoUnwind); 470 471 if (D->hasAttr<AlwaysInlineAttr>()) 472 F->addFnAttr(llvm::Attribute::AlwaysInline); 473 474 if (D->hasAttr<NakedAttr>()) 475 F->addFnAttr(llvm::Attribute::Naked); 476 477 if (D->hasAttr<NoInlineAttr>()) 478 F->addFnAttr(llvm::Attribute::NoInline); 479 480 if (isa<CXXConstructorDecl>(D) || isa<CXXDestructorDecl>(D)) 481 F->setUnnamedAddr(true); 482 483 if (Features.getStackProtectorMode() == LangOptions::SSPOn) 484 F->addFnAttr(llvm::Attribute::StackProtect); 485 else if (Features.getStackProtectorMode() == LangOptions::SSPReq) 486 F->addFnAttr(llvm::Attribute::StackProtectReq); 487 488 unsigned alignment = D->getMaxAlignment() / Context.getCharWidth(); 489 if (alignment) 490 F->setAlignment(alignment); 491 492 // C++ ABI requires 2-byte alignment for member functions. 493 if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D)) 494 F->setAlignment(2); 495} 496 497void CodeGenModule::SetCommonAttributes(const Decl *D, 498 llvm::GlobalValue *GV) { 499 if (const NamedDecl *ND = dyn_cast<NamedDecl>(D)) 500 setGlobalVisibility(GV, ND); 501 else 502 GV->setVisibility(llvm::GlobalValue::DefaultVisibility); 503 504 if (D->hasAttr<UsedAttr>()) 505 AddUsedGlobal(GV); 506 507 if (const SectionAttr *SA = D->getAttr<SectionAttr>()) 508 GV->setSection(SA->getName()); 509 510 getTargetCodeGenInfo().SetTargetAttributes(D, GV, *this); 511} 512 513void CodeGenModule::SetInternalFunctionAttributes(const Decl *D, 514 llvm::Function *F, 515 const CGFunctionInfo &FI) { 516 SetLLVMFunctionAttributes(D, FI, F); 517 SetLLVMFunctionAttributesForDefinition(D, F); 518 519 F->setLinkage(llvm::Function::InternalLinkage); 520 521 SetCommonAttributes(D, F); 522} 523 524void CodeGenModule::SetFunctionAttributes(GlobalDecl GD, 525 llvm::Function *F, 526 bool IsIncompleteFunction) { 527 if (unsigned IID = F->getIntrinsicID()) { 528 // If this is an intrinsic function, set the function's attributes 529 // to the intrinsic's attributes. 530 F->setAttributes(llvm::Intrinsic::getAttributes((llvm::Intrinsic::ID)IID)); 531 return; 532 } 533 534 const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl()); 535 536 if (!IsIncompleteFunction) 537 SetLLVMFunctionAttributes(FD, getTypes().getFunctionInfo(GD), F); 538 539 // Only a few attributes are set on declarations; these may later be 540 // overridden by a definition. 541 542 if (FD->hasAttr<DLLImportAttr>()) { 543 F->setLinkage(llvm::Function::DLLImportLinkage); 544 } else if (FD->hasAttr<WeakAttr>() || 545 FD->isWeakImported()) { 546 // "extern_weak" is overloaded in LLVM; we probably should have 547 // separate linkage types for this. 548 F->setLinkage(llvm::Function::ExternalWeakLinkage); 549 } else { 550 F->setLinkage(llvm::Function::ExternalLinkage); 551 552 NamedDecl::LinkageInfo LV = FD->getLinkageAndVisibility(); 553 if (LV.linkage() == ExternalLinkage && LV.visibilityExplicit()) { 554 F->setVisibility(GetLLVMVisibility(LV.visibility())); 555 } 556 } 557 558 if (const SectionAttr *SA = FD->getAttr<SectionAttr>()) 559 F->setSection(SA->getName()); 560} 561 562void CodeGenModule::AddUsedGlobal(llvm::GlobalValue *GV) { 563 assert(!GV->isDeclaration() && 564 "Only globals with definition can force usage."); 565 LLVMUsed.push_back(GV); 566} 567 568void CodeGenModule::EmitLLVMUsed() { 569 // Don't create llvm.used if there is no need. 570 if (LLVMUsed.empty()) 571 return; 572 573 const llvm::Type *i8PTy = llvm::Type::getInt8PtrTy(VMContext); 574 575 // Convert LLVMUsed to what ConstantArray needs. 576 std::vector<llvm::Constant*> UsedArray; 577 UsedArray.resize(LLVMUsed.size()); 578 for (unsigned i = 0, e = LLVMUsed.size(); i != e; ++i) { 579 UsedArray[i] = 580 llvm::ConstantExpr::getBitCast(cast<llvm::Constant>(&*LLVMUsed[i]), 581 i8PTy); 582 } 583 584 if (UsedArray.empty()) 585 return; 586 llvm::ArrayType *ATy = llvm::ArrayType::get(i8PTy, UsedArray.size()); 587 588 llvm::GlobalVariable *GV = 589 new llvm::GlobalVariable(getModule(), ATy, false, 590 llvm::GlobalValue::AppendingLinkage, 591 llvm::ConstantArray::get(ATy, UsedArray), 592 "llvm.used"); 593 594 GV->setSection("llvm.metadata"); 595} 596 597void CodeGenModule::EmitDeferred() { 598 // Emit code for any potentially referenced deferred decls. Since a 599 // previously unused static decl may become used during the generation of code 600 // for a static function, iterate until no changes are made. 601 602 while (!DeferredDeclsToEmit.empty() || !DeferredVTables.empty()) { 603 if (!DeferredVTables.empty()) { 604 const CXXRecordDecl *RD = DeferredVTables.back(); 605 DeferredVTables.pop_back(); 606 getVTables().GenerateClassData(getVTableLinkage(RD), RD); 607 continue; 608 } 609 610 GlobalDecl D = DeferredDeclsToEmit.back(); 611 DeferredDeclsToEmit.pop_back(); 612 613 // Check to see if we've already emitted this. This is necessary 614 // for a couple of reasons: first, decls can end up in the 615 // deferred-decls queue multiple times, and second, decls can end 616 // up with definitions in unusual ways (e.g. by an extern inline 617 // function acquiring a strong function redefinition). Just 618 // ignore these cases. 619 // 620 // TODO: That said, looking this up multiple times is very wasteful. 621 llvm::StringRef Name = getMangledName(D); 622 llvm::GlobalValue *CGRef = GetGlobalValue(Name); 623 assert(CGRef && "Deferred decl wasn't referenced?"); 624 625 if (!CGRef->isDeclaration()) 626 continue; 627 628 // GlobalAlias::isDeclaration() defers to the aliasee, but for our 629 // purposes an alias counts as a definition. 630 if (isa<llvm::GlobalAlias>(CGRef)) 631 continue; 632 633 // Otherwise, emit the definition and move on to the next one. 634 EmitGlobalDefinition(D); 635 } 636} 637 638/// EmitAnnotateAttr - Generate the llvm::ConstantStruct which contains the 639/// annotation information for a given GlobalValue. The annotation struct is 640/// {i8 *, i8 *, i8 *, i32}. The first field is a constant expression, the 641/// GlobalValue being annotated. The second field is the constant string 642/// created from the AnnotateAttr's annotation. The third field is a constant 643/// string containing the name of the translation unit. The fourth field is 644/// the line number in the file of the annotated value declaration. 645/// 646/// FIXME: this does not unique the annotation string constants, as llvm-gcc 647/// appears to. 648/// 649llvm::Constant *CodeGenModule::EmitAnnotateAttr(llvm::GlobalValue *GV, 650 const AnnotateAttr *AA, 651 unsigned LineNo) { 652 llvm::Module *M = &getModule(); 653 654 // get [N x i8] constants for the annotation string, and the filename string 655 // which are the 2nd and 3rd elements of the global annotation structure. 656 const llvm::Type *SBP = llvm::Type::getInt8PtrTy(VMContext); 657 llvm::Constant *anno = llvm::ConstantArray::get(VMContext, 658 AA->getAnnotation(), true); 659 llvm::Constant *unit = llvm::ConstantArray::get(VMContext, 660 M->getModuleIdentifier(), 661 true); 662 663 // Get the two global values corresponding to the ConstantArrays we just 664 // created to hold the bytes of the strings. 665 llvm::GlobalValue *annoGV = 666 new llvm::GlobalVariable(*M, anno->getType(), false, 667 llvm::GlobalValue::PrivateLinkage, anno, 668 GV->getName()); 669 // translation unit name string, emitted into the llvm.metadata section. 670 llvm::GlobalValue *unitGV = 671 new llvm::GlobalVariable(*M, unit->getType(), false, 672 llvm::GlobalValue::PrivateLinkage, unit, 673 ".str"); 674 unitGV->setUnnamedAddr(true); 675 676 // Create the ConstantStruct for the global annotation. 677 llvm::Constant *Fields[4] = { 678 llvm::ConstantExpr::getBitCast(GV, SBP), 679 llvm::ConstantExpr::getBitCast(annoGV, SBP), 680 llvm::ConstantExpr::getBitCast(unitGV, SBP), 681 llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), LineNo) 682 }; 683 return llvm::ConstantStruct::getAnon(Fields); 684} 685 686bool CodeGenModule::MayDeferGeneration(const ValueDecl *Global) { 687 // Never defer when EmitAllDecls is specified. 688 if (Features.EmitAllDecls) 689 return false; 690 691 return !getContext().DeclMustBeEmitted(Global); 692} 693 694llvm::Constant *CodeGenModule::GetWeakRefReference(const ValueDecl *VD) { 695 const AliasAttr *AA = VD->getAttr<AliasAttr>(); 696 assert(AA && "No alias?"); 697 698 const llvm::Type *DeclTy = getTypes().ConvertTypeForMem(VD->getType()); 699 700 // See if there is already something with the target's name in the module. 701 llvm::GlobalValue *Entry = GetGlobalValue(AA->getAliasee()); 702 703 llvm::Constant *Aliasee; 704 if (isa<llvm::FunctionType>(DeclTy)) 705 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy, GlobalDecl(), 706 /*ForVTable=*/false); 707 else 708 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(), 709 llvm::PointerType::getUnqual(DeclTy), 0); 710 if (!Entry) { 711 llvm::GlobalValue* F = cast<llvm::GlobalValue>(Aliasee); 712 F->setLinkage(llvm::Function::ExternalWeakLinkage); 713 WeakRefReferences.insert(F); 714 } 715 716 return Aliasee; 717} 718 719void CodeGenModule::EmitGlobal(GlobalDecl GD) { 720 const ValueDecl *Global = cast<ValueDecl>(GD.getDecl()); 721 722 // Weak references don't produce any output by themselves. 723 if (Global->hasAttr<WeakRefAttr>()) 724 return; 725 726 // If this is an alias definition (which otherwise looks like a declaration) 727 // emit it now. 728 if (Global->hasAttr<AliasAttr>()) 729 return EmitAliasDefinition(GD); 730 731 // Ignore declarations, they will be emitted on their first use. 732 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Global)) { 733 if (FD->getIdentifier()) { 734 llvm::StringRef Name = FD->getName(); 735 if (Name == "_Block_object_assign") { 736 BlockObjectAssignDecl = FD; 737 } else if (Name == "_Block_object_dispose") { 738 BlockObjectDisposeDecl = FD; 739 } 740 } 741 742 // Forward declarations are emitted lazily on first use. 743 if (!FD->doesThisDeclarationHaveABody()) 744 return; 745 } else { 746 const VarDecl *VD = cast<VarDecl>(Global); 747 assert(VD->isFileVarDecl() && "Cannot emit local var decl as global."); 748 749 if (VD->getIdentifier()) { 750 llvm::StringRef Name = VD->getName(); 751 if (Name == "_NSConcreteGlobalBlock") { 752 NSConcreteGlobalBlockDecl = VD; 753 } else if (Name == "_NSConcreteStackBlock") { 754 NSConcreteStackBlockDecl = VD; 755 } 756 } 757 758 759 if (VD->isThisDeclarationADefinition() != VarDecl::Definition) 760 return; 761 } 762 763 // Defer code generation when possible if this is a static definition, inline 764 // function etc. These we only want to emit if they are used. 765 if (!MayDeferGeneration(Global)) { 766 // Emit the definition if it can't be deferred. 767 EmitGlobalDefinition(GD); 768 return; 769 } 770 771 // If we're deferring emission of a C++ variable with an 772 // initializer, remember the order in which it appeared in the file. 773 if (getLangOptions().CPlusPlus && isa<VarDecl>(Global) && 774 cast<VarDecl>(Global)->hasInit()) { 775 DelayedCXXInitPosition[Global] = CXXGlobalInits.size(); 776 CXXGlobalInits.push_back(0); 777 } 778 779 // If the value has already been used, add it directly to the 780 // DeferredDeclsToEmit list. 781 llvm::StringRef MangledName = getMangledName(GD); 782 if (GetGlobalValue(MangledName)) 783 DeferredDeclsToEmit.push_back(GD); 784 else { 785 // Otherwise, remember that we saw a deferred decl with this name. The 786 // first use of the mangled name will cause it to move into 787 // DeferredDeclsToEmit. 788 DeferredDecls[MangledName] = GD; 789 } 790} 791 792void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD) { 793 const ValueDecl *D = cast<ValueDecl>(GD.getDecl()); 794 795 PrettyStackTraceDecl CrashInfo(const_cast<ValueDecl *>(D), D->getLocation(), 796 Context.getSourceManager(), 797 "Generating code for declaration"); 798 799 if (const FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 800 // At -O0, don't generate IR for functions with available_externally 801 // linkage. 802 if (CodeGenOpts.OptimizationLevel == 0 && 803 !Function->hasAttr<AlwaysInlineAttr>() && 804 getFunctionLinkage(Function) 805 == llvm::Function::AvailableExternallyLinkage) 806 return; 807 808 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 809 // Make sure to emit the definition(s) before we emit the thunks. 810 // This is necessary for the generation of certain thunks. 811 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(Method)) 812 EmitCXXConstructor(CD, GD.getCtorType()); 813 else if (const CXXDestructorDecl *DD =dyn_cast<CXXDestructorDecl>(Method)) 814 EmitCXXDestructor(DD, GD.getDtorType()); 815 else 816 EmitGlobalFunctionDefinition(GD); 817 818 if (Method->isVirtual()) 819 getVTables().EmitThunks(GD); 820 821 return; 822 } 823 824 return EmitGlobalFunctionDefinition(GD); 825 } 826 827 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 828 return EmitGlobalVarDefinition(VD); 829 830 assert(0 && "Invalid argument to EmitGlobalDefinition()"); 831} 832 833/// GetOrCreateLLVMFunction - If the specified mangled name is not in the 834/// module, create and return an llvm Function with the specified type. If there 835/// is something in the module with the specified name, return it potentially 836/// bitcasted to the right type. 837/// 838/// If D is non-null, it specifies a decl that correspond to this. This is used 839/// to set the attributes on the function when it is first created. 840llvm::Constant * 841CodeGenModule::GetOrCreateLLVMFunction(llvm::StringRef MangledName, 842 const llvm::Type *Ty, 843 GlobalDecl D, bool ForVTable, 844 llvm::Attributes ExtraAttrs) { 845 // Lookup the entry, lazily creating it if necessary. 846 llvm::GlobalValue *Entry = GetGlobalValue(MangledName); 847 if (Entry) { 848 if (WeakRefReferences.count(Entry)) { 849 const FunctionDecl *FD = cast_or_null<FunctionDecl>(D.getDecl()); 850 if (FD && !FD->hasAttr<WeakAttr>()) 851 Entry->setLinkage(llvm::Function::ExternalLinkage); 852 853 WeakRefReferences.erase(Entry); 854 } 855 856 if (Entry->getType()->getElementType() == Ty) 857 return Entry; 858 859 // Make sure the result is of the correct type. 860 return llvm::ConstantExpr::getBitCast(Entry, Ty->getPointerTo()); 861 } 862 863 // This function doesn't have a complete type (for example, the return 864 // type is an incomplete struct). Use a fake type instead, and make 865 // sure not to try to set attributes. 866 bool IsIncompleteFunction = false; 867 868 const llvm::FunctionType *FTy; 869 if (isa<llvm::FunctionType>(Ty)) { 870 FTy = cast<llvm::FunctionType>(Ty); 871 } else { 872 FTy = llvm::FunctionType::get(VoidTy, false); 873 IsIncompleteFunction = true; 874 } 875 876 llvm::Function *F = llvm::Function::Create(FTy, 877 llvm::Function::ExternalLinkage, 878 MangledName, &getModule()); 879 assert(F->getName() == MangledName && "name was uniqued!"); 880 if (D.getDecl()) 881 SetFunctionAttributes(D, F, IsIncompleteFunction); 882 if (ExtraAttrs != llvm::Attribute::None) 883 F->addFnAttr(ExtraAttrs); 884 885 // This is the first use or definition of a mangled name. If there is a 886 // deferred decl with this name, remember that we need to emit it at the end 887 // of the file. 888 llvm::StringMap<GlobalDecl>::iterator DDI = DeferredDecls.find(MangledName); 889 if (DDI != DeferredDecls.end()) { 890 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit 891 // list, and remove it from DeferredDecls (since we don't need it anymore). 892 DeferredDeclsToEmit.push_back(DDI->second); 893 DeferredDecls.erase(DDI); 894 895 // Otherwise, there are cases we have to worry about where we're 896 // using a declaration for which we must emit a definition but where 897 // we might not find a top-level definition: 898 // - member functions defined inline in their classes 899 // - friend functions defined inline in some class 900 // - special member functions with implicit definitions 901 // If we ever change our AST traversal to walk into class methods, 902 // this will be unnecessary. 903 // 904 // We also don't emit a definition for a function if it's going to be an entry 905 // in a vtable, unless it's already marked as used. 906 } else if (getLangOptions().CPlusPlus && D.getDecl()) { 907 // Look for a declaration that's lexically in a record. 908 const FunctionDecl *FD = cast<FunctionDecl>(D.getDecl()); 909 do { 910 if (isa<CXXRecordDecl>(FD->getLexicalDeclContext())) { 911 if (FD->isImplicit() && !ForVTable) { 912 assert(FD->isUsed() && "Sema didn't mark implicit function as used!"); 913 DeferredDeclsToEmit.push_back(D.getWithDecl(FD)); 914 break; 915 } else if (FD->doesThisDeclarationHaveABody()) { 916 DeferredDeclsToEmit.push_back(D.getWithDecl(FD)); 917 break; 918 } 919 } 920 FD = FD->getPreviousDeclaration(); 921 } while (FD); 922 } 923 924 // Make sure the result is of the requested type. 925 if (!IsIncompleteFunction) { 926 assert(F->getType()->getElementType() == Ty); 927 return F; 928 } 929 930 llvm::Type *PTy = llvm::PointerType::getUnqual(Ty); 931 return llvm::ConstantExpr::getBitCast(F, PTy); 932} 933 934/// GetAddrOfFunction - Return the address of the given function. If Ty is 935/// non-null, then this function will use the specified type if it has to 936/// create it (this occurs when we see a definition of the function). 937llvm::Constant *CodeGenModule::GetAddrOfFunction(GlobalDecl GD, 938 const llvm::Type *Ty, 939 bool ForVTable) { 940 // If there was no specific requested type, just convert it now. 941 if (!Ty) 942 Ty = getTypes().ConvertType(cast<ValueDecl>(GD.getDecl())->getType()); 943 944 llvm::StringRef MangledName = getMangledName(GD); 945 return GetOrCreateLLVMFunction(MangledName, Ty, GD, ForVTable); 946} 947 948/// CreateRuntimeFunction - Create a new runtime function with the specified 949/// type and name. 950llvm::Constant * 951CodeGenModule::CreateRuntimeFunction(const llvm::FunctionType *FTy, 952 llvm::StringRef Name, 953 llvm::Attributes ExtraAttrs) { 954 return GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(), /*ForVTable=*/false, 955 ExtraAttrs); 956} 957 958static bool DeclIsConstantGlobal(ASTContext &Context, const VarDecl *D, 959 bool ConstantInit) { 960 if (!D->getType().isConstant(Context) && !D->getType()->isReferenceType()) 961 return false; 962 963 if (Context.getLangOptions().CPlusPlus) { 964 if (const RecordType *Record 965 = Context.getBaseElementType(D->getType())->getAs<RecordType>()) 966 return ConstantInit && 967 cast<CXXRecordDecl>(Record->getDecl())->isPOD() && 968 !cast<CXXRecordDecl>(Record->getDecl())->hasMutableFields(); 969 } 970 971 return true; 972} 973 974/// GetOrCreateLLVMGlobal - If the specified mangled name is not in the module, 975/// create and return an llvm GlobalVariable with the specified type. If there 976/// is something in the module with the specified name, return it potentially 977/// bitcasted to the right type. 978/// 979/// If D is non-null, it specifies a decl that correspond to this. This is used 980/// to set the attributes on the global when it is first created. 981llvm::Constant * 982CodeGenModule::GetOrCreateLLVMGlobal(llvm::StringRef MangledName, 983 const llvm::PointerType *Ty, 984 const VarDecl *D, 985 bool UnnamedAddr) { 986 // Lookup the entry, lazily creating it if necessary. 987 llvm::GlobalValue *Entry = GetGlobalValue(MangledName); 988 if (Entry) { 989 if (WeakRefReferences.count(Entry)) { 990 if (D && !D->hasAttr<WeakAttr>()) 991 Entry->setLinkage(llvm::Function::ExternalLinkage); 992 993 WeakRefReferences.erase(Entry); 994 } 995 996 if (UnnamedAddr) 997 Entry->setUnnamedAddr(true); 998 999 if (Entry->getType() == Ty) 1000 return Entry; 1001 1002 // Make sure the result is of the correct type. 1003 return llvm::ConstantExpr::getBitCast(Entry, Ty); 1004 } 1005 1006 // This is the first use or definition of a mangled name. If there is a 1007 // deferred decl with this name, remember that we need to emit it at the end 1008 // of the file. 1009 llvm::StringMap<GlobalDecl>::iterator DDI = DeferredDecls.find(MangledName); 1010 if (DDI != DeferredDecls.end()) { 1011 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit 1012 // list, and remove it from DeferredDecls (since we don't need it anymore). 1013 DeferredDeclsToEmit.push_back(DDI->second); 1014 DeferredDecls.erase(DDI); 1015 } 1016 1017 llvm::GlobalVariable *GV = 1018 new llvm::GlobalVariable(getModule(), Ty->getElementType(), false, 1019 llvm::GlobalValue::ExternalLinkage, 1020 0, MangledName, 0, 1021 false, Ty->getAddressSpace()); 1022 1023 // Handle things which are present even on external declarations. 1024 if (D) { 1025 // FIXME: This code is overly simple and should be merged with other global 1026 // handling. 1027 GV->setConstant(DeclIsConstantGlobal(Context, D, false)); 1028 1029 // Set linkage and visibility in case we never see a definition. 1030 NamedDecl::LinkageInfo LV = D->getLinkageAndVisibility(); 1031 if (LV.linkage() != ExternalLinkage) { 1032 // Don't set internal linkage on declarations. 1033 } else { 1034 if (D->hasAttr<DLLImportAttr>()) 1035 GV->setLinkage(llvm::GlobalValue::DLLImportLinkage); 1036 else if (D->hasAttr<WeakAttr>() || D->isWeakImported()) 1037 GV->setLinkage(llvm::GlobalValue::ExternalWeakLinkage); 1038 1039 // Set visibility on a declaration only if it's explicit. 1040 if (LV.visibilityExplicit()) 1041 GV->setVisibility(GetLLVMVisibility(LV.visibility())); 1042 } 1043 1044 GV->setThreadLocal(D->isThreadSpecified()); 1045 } 1046 1047 return GV; 1048} 1049 1050 1051llvm::GlobalVariable * 1052CodeGenModule::CreateOrReplaceCXXRuntimeVariable(llvm::StringRef Name, 1053 const llvm::Type *Ty, 1054 llvm::GlobalValue::LinkageTypes Linkage) { 1055 llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name); 1056 llvm::GlobalVariable *OldGV = 0; 1057 1058 1059 if (GV) { 1060 // Check if the variable has the right type. 1061 if (GV->getType()->getElementType() == Ty) 1062 return GV; 1063 1064 // Because C++ name mangling, the only way we can end up with an already 1065 // existing global with the same name is if it has been declared extern "C". 1066 assert(GV->isDeclaration() && "Declaration has wrong type!"); 1067 OldGV = GV; 1068 } 1069 1070 // Create a new variable. 1071 GV = new llvm::GlobalVariable(getModule(), Ty, /*isConstant=*/true, 1072 Linkage, 0, Name); 1073 1074 if (OldGV) { 1075 // Replace occurrences of the old variable if needed. 1076 GV->takeName(OldGV); 1077 1078 if (!OldGV->use_empty()) { 1079 llvm::Constant *NewPtrForOldDecl = 1080 llvm::ConstantExpr::getBitCast(GV, OldGV->getType()); 1081 OldGV->replaceAllUsesWith(NewPtrForOldDecl); 1082 } 1083 1084 OldGV->eraseFromParent(); 1085 } 1086 1087 return GV; 1088} 1089 1090/// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the 1091/// given global variable. If Ty is non-null and if the global doesn't exist, 1092/// then it will be greated with the specified type instead of whatever the 1093/// normal requested type would be. 1094llvm::Constant *CodeGenModule::GetAddrOfGlobalVar(const VarDecl *D, 1095 const llvm::Type *Ty) { 1096 assert(D->hasGlobalStorage() && "Not a global variable"); 1097 QualType ASTTy = D->getType(); 1098 if (Ty == 0) 1099 Ty = getTypes().ConvertTypeForMem(ASTTy); 1100 1101 const llvm::PointerType *PTy = 1102 llvm::PointerType::get(Ty, getContext().getTargetAddressSpace(ASTTy)); 1103 1104 llvm::StringRef MangledName = getMangledName(D); 1105 return GetOrCreateLLVMGlobal(MangledName, PTy, D); 1106} 1107 1108/// CreateRuntimeVariable - Create a new runtime global variable with the 1109/// specified type and name. 1110llvm::Constant * 1111CodeGenModule::CreateRuntimeVariable(const llvm::Type *Ty, 1112 llvm::StringRef Name) { 1113 return GetOrCreateLLVMGlobal(Name, llvm::PointerType::getUnqual(Ty), 0, 1114 true); 1115} 1116 1117void CodeGenModule::EmitTentativeDefinition(const VarDecl *D) { 1118 assert(!D->getInit() && "Cannot emit definite definitions here!"); 1119 1120 if (MayDeferGeneration(D)) { 1121 // If we have not seen a reference to this variable yet, place it 1122 // into the deferred declarations table to be emitted if needed 1123 // later. 1124 llvm::StringRef MangledName = getMangledName(D); 1125 if (!GetGlobalValue(MangledName)) { 1126 DeferredDecls[MangledName] = D; 1127 return; 1128 } 1129 } 1130 1131 // The tentative definition is the only definition. 1132 EmitGlobalVarDefinition(D); 1133} 1134 1135void CodeGenModule::EmitVTable(CXXRecordDecl *Class, bool DefinitionRequired) { 1136 if (DefinitionRequired) 1137 getVTables().GenerateClassData(getVTableLinkage(Class), Class); 1138} 1139 1140llvm::GlobalVariable::LinkageTypes 1141CodeGenModule::getVTableLinkage(const CXXRecordDecl *RD) { 1142 if (RD->getLinkage() != ExternalLinkage) 1143 return llvm::GlobalVariable::InternalLinkage; 1144 1145 if (const CXXMethodDecl *KeyFunction 1146 = RD->getASTContext().getKeyFunction(RD)) { 1147 // If this class has a key function, use that to determine the linkage of 1148 // the vtable. 1149 const FunctionDecl *Def = 0; 1150 if (KeyFunction->hasBody(Def)) 1151 KeyFunction = cast<CXXMethodDecl>(Def); 1152 1153 switch (KeyFunction->getTemplateSpecializationKind()) { 1154 case TSK_Undeclared: 1155 case TSK_ExplicitSpecialization: 1156 // When compiling with optimizations turned on, we emit all vtables, 1157 // even if the key function is not defined in the current translation 1158 // unit. If this is the case, use available_externally linkage. 1159 if (!Def && CodeGenOpts.OptimizationLevel) 1160 return llvm::GlobalVariable::AvailableExternallyLinkage; 1161 1162 if (KeyFunction->isInlined()) 1163 return !Context.getLangOptions().AppleKext ? 1164 llvm::GlobalVariable::LinkOnceODRLinkage : 1165 llvm::Function::InternalLinkage; 1166 1167 return llvm::GlobalVariable::ExternalLinkage; 1168 1169 case TSK_ImplicitInstantiation: 1170 return !Context.getLangOptions().AppleKext ? 1171 llvm::GlobalVariable::LinkOnceODRLinkage : 1172 llvm::Function::InternalLinkage; 1173 1174 case TSK_ExplicitInstantiationDefinition: 1175 return !Context.getLangOptions().AppleKext ? 1176 llvm::GlobalVariable::WeakODRLinkage : 1177 llvm::Function::InternalLinkage; 1178 1179 case TSK_ExplicitInstantiationDeclaration: 1180 // FIXME: Use available_externally linkage. However, this currently 1181 // breaks LLVM's build due to undefined symbols. 1182 // return llvm::GlobalVariable::AvailableExternallyLinkage; 1183 return !Context.getLangOptions().AppleKext ? 1184 llvm::GlobalVariable::LinkOnceODRLinkage : 1185 llvm::Function::InternalLinkage; 1186 } 1187 } 1188 1189 if (Context.getLangOptions().AppleKext) 1190 return llvm::Function::InternalLinkage; 1191 1192 switch (RD->getTemplateSpecializationKind()) { 1193 case TSK_Undeclared: 1194 case TSK_ExplicitSpecialization: 1195 case TSK_ImplicitInstantiation: 1196 // FIXME: Use available_externally linkage. However, this currently 1197 // breaks LLVM's build due to undefined symbols. 1198 // return llvm::GlobalVariable::AvailableExternallyLinkage; 1199 case TSK_ExplicitInstantiationDeclaration: 1200 return llvm::GlobalVariable::LinkOnceODRLinkage; 1201 1202 case TSK_ExplicitInstantiationDefinition: 1203 return llvm::GlobalVariable::WeakODRLinkage; 1204 } 1205 1206 // Silence GCC warning. 1207 return llvm::GlobalVariable::LinkOnceODRLinkage; 1208} 1209 1210CharUnits CodeGenModule::GetTargetTypeStoreSize(const llvm::Type *Ty) const { 1211 return Context.toCharUnitsFromBits( 1212 TheTargetData.getTypeStoreSizeInBits(Ty)); 1213} 1214 1215void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D) { 1216 llvm::Constant *Init = 0; 1217 QualType ASTTy = D->getType(); 1218 bool NonConstInit = false; 1219 1220 const Expr *InitExpr = D->getAnyInitializer(); 1221 1222 if (!InitExpr) { 1223 // This is a tentative definition; tentative definitions are 1224 // implicitly initialized with { 0 }. 1225 // 1226 // Note that tentative definitions are only emitted at the end of 1227 // a translation unit, so they should never have incomplete 1228 // type. In addition, EmitTentativeDefinition makes sure that we 1229 // never attempt to emit a tentative definition if a real one 1230 // exists. A use may still exists, however, so we still may need 1231 // to do a RAUW. 1232 assert(!ASTTy->isIncompleteType() && "Unexpected incomplete type"); 1233 Init = EmitNullConstant(D->getType()); 1234 } else { 1235 Init = EmitConstantExpr(InitExpr, D->getType()); 1236 if (!Init) { 1237 QualType T = InitExpr->getType(); 1238 if (D->getType()->isReferenceType()) 1239 T = D->getType(); 1240 1241 if (getLangOptions().CPlusPlus) { 1242 Init = EmitNullConstant(T); 1243 NonConstInit = true; 1244 } else { 1245 ErrorUnsupported(D, "static initializer"); 1246 Init = llvm::UndefValue::get(getTypes().ConvertType(T)); 1247 } 1248 } else { 1249 // We don't need an initializer, so remove the entry for the delayed 1250 // initializer position (just in case this entry was delayed). 1251 if (getLangOptions().CPlusPlus) 1252 DelayedCXXInitPosition.erase(D); 1253 } 1254 } 1255 1256 const llvm::Type* InitType = Init->getType(); 1257 llvm::Constant *Entry = GetAddrOfGlobalVar(D, InitType); 1258 1259 // Strip off a bitcast if we got one back. 1260 if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) { 1261 assert(CE->getOpcode() == llvm::Instruction::BitCast || 1262 // all zero index gep. 1263 CE->getOpcode() == llvm::Instruction::GetElementPtr); 1264 Entry = CE->getOperand(0); 1265 } 1266 1267 // Entry is now either a Function or GlobalVariable. 1268 llvm::GlobalVariable *GV = dyn_cast<llvm::GlobalVariable>(Entry); 1269 1270 // We have a definition after a declaration with the wrong type. 1271 // We must make a new GlobalVariable* and update everything that used OldGV 1272 // (a declaration or tentative definition) with the new GlobalVariable* 1273 // (which will be a definition). 1274 // 1275 // This happens if there is a prototype for a global (e.g. 1276 // "extern int x[];") and then a definition of a different type (e.g. 1277 // "int x[10];"). This also happens when an initializer has a different type 1278 // from the type of the global (this happens with unions). 1279 if (GV == 0 || 1280 GV->getType()->getElementType() != InitType || 1281 GV->getType()->getAddressSpace() != 1282 getContext().getTargetAddressSpace(ASTTy)) { 1283 1284 // Move the old entry aside so that we'll create a new one. 1285 Entry->setName(llvm::StringRef()); 1286 1287 // Make a new global with the correct type, this is now guaranteed to work. 1288 GV = cast<llvm::GlobalVariable>(GetAddrOfGlobalVar(D, InitType)); 1289 1290 // Replace all uses of the old global with the new global 1291 llvm::Constant *NewPtrForOldDecl = 1292 llvm::ConstantExpr::getBitCast(GV, Entry->getType()); 1293 Entry->replaceAllUsesWith(NewPtrForOldDecl); 1294 1295 // Erase the old global, since it is no longer used. 1296 cast<llvm::GlobalValue>(Entry)->eraseFromParent(); 1297 } 1298 1299 if (const AnnotateAttr *AA = D->getAttr<AnnotateAttr>()) { 1300 SourceManager &SM = Context.getSourceManager(); 1301 AddAnnotation(EmitAnnotateAttr(GV, AA, 1302 SM.getInstantiationLineNumber(D->getLocation()))); 1303 } 1304 1305 GV->setInitializer(Init); 1306 1307 // If it is safe to mark the global 'constant', do so now. 1308 GV->setConstant(false); 1309 if (!NonConstInit && DeclIsConstantGlobal(Context, D, true)) 1310 GV->setConstant(true); 1311 1312 GV->setAlignment(getContext().getDeclAlign(D).getQuantity()); 1313 1314 // Set the llvm linkage type as appropriate. 1315 llvm::GlobalValue::LinkageTypes Linkage = 1316 GetLLVMLinkageVarDefinition(D, GV); 1317 GV->setLinkage(Linkage); 1318 if (Linkage == llvm::GlobalVariable::CommonLinkage) 1319 // common vars aren't constant even if declared const. 1320 GV->setConstant(false); 1321 1322 SetCommonAttributes(D, GV); 1323 1324 // Emit the initializer function if necessary. 1325 if (NonConstInit) 1326 EmitCXXGlobalVarDeclInitFunc(D, GV); 1327 1328 // Emit global variable debug information. 1329 if (CGDebugInfo *DI = getModuleDebugInfo()) { 1330 DI->setLocation(D->getLocation()); 1331 DI->EmitGlobalVariable(GV, D); 1332 } 1333} 1334 1335llvm::GlobalValue::LinkageTypes 1336CodeGenModule::GetLLVMLinkageVarDefinition(const VarDecl *D, 1337 llvm::GlobalVariable *GV) { 1338 GVALinkage Linkage = getContext().GetGVALinkageForVariable(D); 1339 if (Linkage == GVA_Internal) 1340 return llvm::Function::InternalLinkage; 1341 else if (D->hasAttr<DLLImportAttr>()) 1342 return llvm::Function::DLLImportLinkage; 1343 else if (D->hasAttr<DLLExportAttr>()) 1344 return llvm::Function::DLLExportLinkage; 1345 else if (D->hasAttr<WeakAttr>()) { 1346 if (GV->isConstant()) 1347 return llvm::GlobalVariable::WeakODRLinkage; 1348 else 1349 return llvm::GlobalVariable::WeakAnyLinkage; 1350 } else if (Linkage == GVA_TemplateInstantiation || 1351 Linkage == GVA_ExplicitTemplateInstantiation) 1352 return llvm::GlobalVariable::WeakODRLinkage; 1353 else if (!getLangOptions().CPlusPlus && 1354 ((!CodeGenOpts.NoCommon && !D->getAttr<NoCommonAttr>()) || 1355 D->getAttr<CommonAttr>()) && 1356 !D->hasExternalStorage() && !D->getInit() && 1357 !D->getAttr<SectionAttr>() && !D->isThreadSpecified() && 1358 !D->getAttr<WeakImportAttr>()) { 1359 // Thread local vars aren't considered common linkage. 1360 return llvm::GlobalVariable::CommonLinkage; 1361 } 1362 return llvm::GlobalVariable::ExternalLinkage; 1363} 1364 1365/// ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we 1366/// implement a function with no prototype, e.g. "int foo() {}". If there are 1367/// existing call uses of the old function in the module, this adjusts them to 1368/// call the new function directly. 1369/// 1370/// This is not just a cleanup: the always_inline pass requires direct calls to 1371/// functions to be able to inline them. If there is a bitcast in the way, it 1372/// won't inline them. Instcombine normally deletes these calls, but it isn't 1373/// run at -O0. 1374static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old, 1375 llvm::Function *NewFn) { 1376 // If we're redefining a global as a function, don't transform it. 1377 llvm::Function *OldFn = dyn_cast<llvm::Function>(Old); 1378 if (OldFn == 0) return; 1379 1380 const llvm::Type *NewRetTy = NewFn->getReturnType(); 1381 llvm::SmallVector<llvm::Value*, 4> ArgList; 1382 1383 for (llvm::Value::use_iterator UI = OldFn->use_begin(), E = OldFn->use_end(); 1384 UI != E; ) { 1385 // TODO: Do invokes ever occur in C code? If so, we should handle them too. 1386 llvm::Value::use_iterator I = UI++; // Increment before the CI is erased. 1387 llvm::CallInst *CI = dyn_cast<llvm::CallInst>(*I); 1388 if (!CI) continue; // FIXME: when we allow Invoke, just do CallSite CS(*I) 1389 llvm::CallSite CS(CI); 1390 if (!CI || !CS.isCallee(I)) continue; 1391 1392 // If the return types don't match exactly, and if the call isn't dead, then 1393 // we can't transform this call. 1394 if (CI->getType() != NewRetTy && !CI->use_empty()) 1395 continue; 1396 1397 // If the function was passed too few arguments, don't transform. If extra 1398 // arguments were passed, we silently drop them. If any of the types 1399 // mismatch, we don't transform. 1400 unsigned ArgNo = 0; 1401 bool DontTransform = false; 1402 for (llvm::Function::arg_iterator AI = NewFn->arg_begin(), 1403 E = NewFn->arg_end(); AI != E; ++AI, ++ArgNo) { 1404 if (CS.arg_size() == ArgNo || 1405 CS.getArgument(ArgNo)->getType() != AI->getType()) { 1406 DontTransform = true; 1407 break; 1408 } 1409 } 1410 if (DontTransform) 1411 continue; 1412 1413 // Okay, we can transform this. Create the new call instruction and copy 1414 // over the required information. 1415 ArgList.append(CS.arg_begin(), CS.arg_begin() + ArgNo); 1416 llvm::CallInst *NewCall = llvm::CallInst::Create(NewFn, ArgList, "", CI); 1417 ArgList.clear(); 1418 if (!NewCall->getType()->isVoidTy()) 1419 NewCall->takeName(CI); 1420 NewCall->setAttributes(CI->getAttributes()); 1421 NewCall->setCallingConv(CI->getCallingConv()); 1422 1423 // Finally, remove the old call, replacing any uses with the new one. 1424 if (!CI->use_empty()) 1425 CI->replaceAllUsesWith(NewCall); 1426 1427 // Copy debug location attached to CI. 1428 if (!CI->getDebugLoc().isUnknown()) 1429 NewCall->setDebugLoc(CI->getDebugLoc()); 1430 CI->eraseFromParent(); 1431 } 1432} 1433 1434 1435void CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD) { 1436 const FunctionDecl *D = cast<FunctionDecl>(GD.getDecl()); 1437 1438 // Compute the function info and LLVM type. 1439 const CGFunctionInfo &FI = getTypes().getFunctionInfo(GD); 1440 bool variadic = false; 1441 if (const FunctionProtoType *fpt = D->getType()->getAs<FunctionProtoType>()) 1442 variadic = fpt->isVariadic(); 1443 const llvm::FunctionType *Ty = getTypes().GetFunctionType(FI, variadic); 1444 1445 // Get or create the prototype for the function. 1446 llvm::Constant *Entry = GetAddrOfFunction(GD, Ty); 1447 1448 // Strip off a bitcast if we got one back. 1449 if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) { 1450 assert(CE->getOpcode() == llvm::Instruction::BitCast); 1451 Entry = CE->getOperand(0); 1452 } 1453 1454 1455 if (cast<llvm::GlobalValue>(Entry)->getType()->getElementType() != Ty) { 1456 llvm::GlobalValue *OldFn = cast<llvm::GlobalValue>(Entry); 1457 1458 // If the types mismatch then we have to rewrite the definition. 1459 assert(OldFn->isDeclaration() && 1460 "Shouldn't replace non-declaration"); 1461 1462 // F is the Function* for the one with the wrong type, we must make a new 1463 // Function* and update everything that used F (a declaration) with the new 1464 // Function* (which will be a definition). 1465 // 1466 // This happens if there is a prototype for a function 1467 // (e.g. "int f()") and then a definition of a different type 1468 // (e.g. "int f(int x)"). Move the old function aside so that it 1469 // doesn't interfere with GetAddrOfFunction. 1470 OldFn->setName(llvm::StringRef()); 1471 llvm::Function *NewFn = cast<llvm::Function>(GetAddrOfFunction(GD, Ty)); 1472 1473 // If this is an implementation of a function without a prototype, try to 1474 // replace any existing uses of the function (which may be calls) with uses 1475 // of the new function 1476 if (D->getType()->isFunctionNoProtoType()) { 1477 ReplaceUsesOfNonProtoTypeWithRealFunction(OldFn, NewFn); 1478 OldFn->removeDeadConstantUsers(); 1479 } 1480 1481 // Replace uses of F with the Function we will endow with a body. 1482 if (!Entry->use_empty()) { 1483 llvm::Constant *NewPtrForOldDecl = 1484 llvm::ConstantExpr::getBitCast(NewFn, Entry->getType()); 1485 Entry->replaceAllUsesWith(NewPtrForOldDecl); 1486 } 1487 1488 // Ok, delete the old function now, which is dead. 1489 OldFn->eraseFromParent(); 1490 1491 Entry = NewFn; 1492 } 1493 1494 // We need to set linkage and visibility on the function before 1495 // generating code for it because various parts of IR generation 1496 // want to propagate this information down (e.g. to local static 1497 // declarations). 1498 llvm::Function *Fn = cast<llvm::Function>(Entry); 1499 setFunctionLinkage(D, Fn); 1500 1501 // FIXME: this is redundant with part of SetFunctionDefinitionAttributes 1502 setGlobalVisibility(Fn, D); 1503 1504 CodeGenFunction(*this).GenerateCode(D, Fn, FI); 1505 1506 SetFunctionDefinitionAttributes(D, Fn); 1507 SetLLVMFunctionAttributesForDefinition(D, Fn); 1508 1509 if (const ConstructorAttr *CA = D->getAttr<ConstructorAttr>()) 1510 AddGlobalCtor(Fn, CA->getPriority()); 1511 if (const DestructorAttr *DA = D->getAttr<DestructorAttr>()) 1512 AddGlobalDtor(Fn, DA->getPriority()); 1513} 1514 1515void CodeGenModule::EmitAliasDefinition(GlobalDecl GD) { 1516 const ValueDecl *D = cast<ValueDecl>(GD.getDecl()); 1517 const AliasAttr *AA = D->getAttr<AliasAttr>(); 1518 assert(AA && "Not an alias?"); 1519 1520 llvm::StringRef MangledName = getMangledName(GD); 1521 1522 // If there is a definition in the module, then it wins over the alias. 1523 // This is dubious, but allow it to be safe. Just ignore the alias. 1524 llvm::GlobalValue *Entry = GetGlobalValue(MangledName); 1525 if (Entry && !Entry->isDeclaration()) 1526 return; 1527 1528 const llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType()); 1529 1530 // Create a reference to the named value. This ensures that it is emitted 1531 // if a deferred decl. 1532 llvm::Constant *Aliasee; 1533 if (isa<llvm::FunctionType>(DeclTy)) 1534 Aliasee = GetOrCreateLLVMFunction(AA->getAliasee(), DeclTy, GlobalDecl(), 1535 /*ForVTable=*/false); 1536 else 1537 Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(), 1538 llvm::PointerType::getUnqual(DeclTy), 0); 1539 1540 // Create the new alias itself, but don't set a name yet. 1541 llvm::GlobalValue *GA = 1542 new llvm::GlobalAlias(Aliasee->getType(), 1543 llvm::Function::ExternalLinkage, 1544 "", Aliasee, &getModule()); 1545 1546 if (Entry) { 1547 assert(Entry->isDeclaration()); 1548 1549 // If there is a declaration in the module, then we had an extern followed 1550 // by the alias, as in: 1551 // extern int test6(); 1552 // ... 1553 // int test6() __attribute__((alias("test7"))); 1554 // 1555 // Remove it and replace uses of it with the alias. 1556 GA->takeName(Entry); 1557 1558 Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GA, 1559 Entry->getType())); 1560 Entry->eraseFromParent(); 1561 } else { 1562 GA->setName(MangledName); 1563 } 1564 1565 // Set attributes which are particular to an alias; this is a 1566 // specialization of the attributes which may be set on a global 1567 // variable/function. 1568 if (D->hasAttr<DLLExportAttr>()) { 1569 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1570 // The dllexport attribute is ignored for undefined symbols. 1571 if (FD->hasBody()) 1572 GA->setLinkage(llvm::Function::DLLExportLinkage); 1573 } else { 1574 GA->setLinkage(llvm::Function::DLLExportLinkage); 1575 } 1576 } else if (D->hasAttr<WeakAttr>() || 1577 D->hasAttr<WeakRefAttr>() || 1578 D->isWeakImported()) { 1579 GA->setLinkage(llvm::Function::WeakAnyLinkage); 1580 } 1581 1582 SetCommonAttributes(D, GA); 1583} 1584 1585/// getBuiltinLibFunction - Given a builtin id for a function like 1586/// "__builtin_fabsf", return a Function* for "fabsf". 1587llvm::Value *CodeGenModule::getBuiltinLibFunction(const FunctionDecl *FD, 1588 unsigned BuiltinID) { 1589 assert((Context.BuiltinInfo.isLibFunction(BuiltinID) || 1590 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) && 1591 "isn't a lib fn"); 1592 1593 // Get the name, skip over the __builtin_ prefix (if necessary). 1594 llvm::StringRef Name; 1595 GlobalDecl D(FD); 1596 1597 // If the builtin has been declared explicitly with an assembler label, 1598 // use the mangled name. This differs from the plain label on platforms 1599 // that prefix labels. 1600 if (FD->hasAttr<AsmLabelAttr>()) 1601 Name = getMangledName(D); 1602 else if (Context.BuiltinInfo.isLibFunction(BuiltinID)) 1603 Name = Context.BuiltinInfo.GetName(BuiltinID) + 10; 1604 else 1605 Name = Context.BuiltinInfo.GetName(BuiltinID); 1606 1607 1608 const llvm::FunctionType *Ty = 1609 cast<llvm::FunctionType>(getTypes().ConvertType(FD->getType())); 1610 1611 return GetOrCreateLLVMFunction(Name, Ty, D, /*ForVTable=*/false); 1612} 1613 1614llvm::Function *CodeGenModule::getIntrinsic(unsigned IID, 1615 llvm::ArrayRef<llvm::Type*> Tys) { 1616 return llvm::Intrinsic::getDeclaration(&getModule(), (llvm::Intrinsic::ID)IID, 1617 Tys); 1618} 1619 1620static llvm::StringMapEntry<llvm::Constant*> & 1621GetConstantCFStringEntry(llvm::StringMap<llvm::Constant*> &Map, 1622 const StringLiteral *Literal, 1623 bool TargetIsLSB, 1624 bool &IsUTF16, 1625 unsigned &StringLength) { 1626 llvm::StringRef String = Literal->getString(); 1627 unsigned NumBytes = String.size(); 1628 1629 // Check for simple case. 1630 if (!Literal->containsNonAsciiOrNull()) { 1631 StringLength = NumBytes; 1632 return Map.GetOrCreateValue(String); 1633 } 1634 1635 // Otherwise, convert the UTF8 literals into a byte string. 1636 llvm::SmallVector<UTF16, 128> ToBuf(NumBytes); 1637 const UTF8 *FromPtr = (UTF8 *)String.data(); 1638 UTF16 *ToPtr = &ToBuf[0]; 1639 1640 (void)ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes, 1641 &ToPtr, ToPtr + NumBytes, 1642 strictConversion); 1643 1644 // ConvertUTF8toUTF16 returns the length in ToPtr. 1645 StringLength = ToPtr - &ToBuf[0]; 1646 1647 // Render the UTF-16 string into a byte array and convert to the target byte 1648 // order. 1649 // 1650 // FIXME: This isn't something we should need to do here. 1651 llvm::SmallString<128> AsBytes; 1652 AsBytes.reserve(StringLength * 2); 1653 for (unsigned i = 0; i != StringLength; ++i) { 1654 unsigned short Val = ToBuf[i]; 1655 if (TargetIsLSB) { 1656 AsBytes.push_back(Val & 0xFF); 1657 AsBytes.push_back(Val >> 8); 1658 } else { 1659 AsBytes.push_back(Val >> 8); 1660 AsBytes.push_back(Val & 0xFF); 1661 } 1662 } 1663 // Append one extra null character, the second is automatically added by our 1664 // caller. 1665 AsBytes.push_back(0); 1666 1667 IsUTF16 = true; 1668 return Map.GetOrCreateValue(llvm::StringRef(AsBytes.data(), AsBytes.size())); 1669} 1670 1671static llvm::StringMapEntry<llvm::Constant*> & 1672GetConstantStringEntry(llvm::StringMap<llvm::Constant*> &Map, 1673 const StringLiteral *Literal, 1674 unsigned &StringLength) 1675{ 1676 llvm::StringRef String = Literal->getString(); 1677 StringLength = String.size(); 1678 return Map.GetOrCreateValue(String); 1679} 1680 1681llvm::Constant * 1682CodeGenModule::GetAddrOfConstantCFString(const StringLiteral *Literal) { 1683 unsigned StringLength = 0; 1684 bool isUTF16 = false; 1685 llvm::StringMapEntry<llvm::Constant*> &Entry = 1686 GetConstantCFStringEntry(CFConstantStringMap, Literal, 1687 getTargetData().isLittleEndian(), 1688 isUTF16, StringLength); 1689 1690 if (llvm::Constant *C = Entry.getValue()) 1691 return C; 1692 1693 llvm::Constant *Zero = 1694 llvm::Constant::getNullValue(llvm::Type::getInt32Ty(VMContext)); 1695 llvm::Constant *Zeros[] = { Zero, Zero }; 1696 1697 // If we don't already have it, get __CFConstantStringClassReference. 1698 if (!CFConstantStringClassRef) { 1699 const llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy); 1700 Ty = llvm::ArrayType::get(Ty, 0); 1701 llvm::Constant *GV = CreateRuntimeVariable(Ty, 1702 "__CFConstantStringClassReference"); 1703 // Decay array -> ptr 1704 CFConstantStringClassRef = 1705 llvm::ConstantExpr::getGetElementPtr(GV, Zeros, 2); 1706 } 1707 1708 QualType CFTy = getContext().getCFConstantStringType(); 1709 1710 const llvm::StructType *STy = 1711 cast<llvm::StructType>(getTypes().ConvertType(CFTy)); 1712 1713 std::vector<llvm::Constant*> Fields(4); 1714 1715 // Class pointer. 1716 Fields[0] = CFConstantStringClassRef; 1717 1718 // Flags. 1719 const llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy); 1720 Fields[1] = isUTF16 ? llvm::ConstantInt::get(Ty, 0x07d0) : 1721 llvm::ConstantInt::get(Ty, 0x07C8); 1722 1723 // String pointer. 1724 llvm::Constant *C = llvm::ConstantArray::get(VMContext, Entry.getKey().str()); 1725 1726 llvm::GlobalValue::LinkageTypes Linkage; 1727 bool isConstant; 1728 if (isUTF16) { 1729 // FIXME: why do utf strings get "_" labels instead of "L" labels? 1730 Linkage = llvm::GlobalValue::InternalLinkage; 1731 // Note: -fwritable-strings doesn't make unicode CFStrings writable, but 1732 // does make plain ascii ones writable. 1733 isConstant = true; 1734 } else { 1735 // FIXME: With OS X ld 123.2 (xcode 4) and LTO we would get a linker error 1736 // when using private linkage. It is not clear if this is a bug in ld 1737 // or a reasonable new restriction. 1738 Linkage = llvm::GlobalValue::LinkerPrivateLinkage; 1739 isConstant = !Features.WritableStrings; 1740 } 1741 1742 llvm::GlobalVariable *GV = 1743 new llvm::GlobalVariable(getModule(), C->getType(), isConstant, Linkage, C, 1744 ".str"); 1745 GV->setUnnamedAddr(true); 1746 if (isUTF16) { 1747 CharUnits Align = getContext().getTypeAlignInChars(getContext().ShortTy); 1748 GV->setAlignment(Align.getQuantity()); 1749 } else { 1750 CharUnits Align = getContext().getTypeAlignInChars(getContext().CharTy); 1751 GV->setAlignment(Align.getQuantity()); 1752 } 1753 Fields[2] = llvm::ConstantExpr::getGetElementPtr(GV, Zeros, 2); 1754 1755 // String length. 1756 Ty = getTypes().ConvertType(getContext().LongTy); 1757 Fields[3] = llvm::ConstantInt::get(Ty, StringLength); 1758 1759 // The struct. 1760 C = llvm::ConstantStruct::get(STy, Fields); 1761 GV = new llvm::GlobalVariable(getModule(), C->getType(), true, 1762 llvm::GlobalVariable::PrivateLinkage, C, 1763 "_unnamed_cfstring_"); 1764 if (const char *Sect = getContext().Target.getCFStringSection()) 1765 GV->setSection(Sect); 1766 Entry.setValue(GV); 1767 1768 return GV; 1769} 1770 1771llvm::Constant * 1772CodeGenModule::GetAddrOfConstantString(const StringLiteral *Literal) { 1773 unsigned StringLength = 0; 1774 llvm::StringMapEntry<llvm::Constant*> &Entry = 1775 GetConstantStringEntry(CFConstantStringMap, Literal, StringLength); 1776 1777 if (llvm::Constant *C = Entry.getValue()) 1778 return C; 1779 1780 llvm::Constant *Zero = 1781 llvm::Constant::getNullValue(llvm::Type::getInt32Ty(VMContext)); 1782 llvm::Constant *Zeros[] = { Zero, Zero }; 1783 1784 // If we don't already have it, get _NSConstantStringClassReference. 1785 if (!ConstantStringClassRef) { 1786 std::string StringClass(getLangOptions().ObjCConstantStringClass); 1787 const llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy); 1788 llvm::Constant *GV; 1789 if (Features.ObjCNonFragileABI) { 1790 std::string str = 1791 StringClass.empty() ? "OBJC_CLASS_$_NSConstantString" 1792 : "OBJC_CLASS_$_" + StringClass; 1793 GV = getObjCRuntime().GetClassGlobal(str); 1794 // Make sure the result is of the correct type. 1795 const llvm::Type *PTy = llvm::PointerType::getUnqual(Ty); 1796 ConstantStringClassRef = 1797 llvm::ConstantExpr::getBitCast(GV, PTy); 1798 } else { 1799 std::string str = 1800 StringClass.empty() ? "_NSConstantStringClassReference" 1801 : "_" + StringClass + "ClassReference"; 1802 const llvm::Type *PTy = llvm::ArrayType::get(Ty, 0); 1803 GV = CreateRuntimeVariable(PTy, str); 1804 // Decay array -> ptr 1805 ConstantStringClassRef = 1806 llvm::ConstantExpr::getGetElementPtr(GV, Zeros, 2); 1807 } 1808 } 1809 1810 QualType NSTy = getContext().getNSConstantStringType(); 1811 1812 const llvm::StructType *STy = 1813 cast<llvm::StructType>(getTypes().ConvertType(NSTy)); 1814 1815 std::vector<llvm::Constant*> Fields(3); 1816 1817 // Class pointer. 1818 Fields[0] = ConstantStringClassRef; 1819 1820 // String pointer. 1821 llvm::Constant *C = llvm::ConstantArray::get(VMContext, Entry.getKey().str()); 1822 1823 llvm::GlobalValue::LinkageTypes Linkage; 1824 bool isConstant; 1825 Linkage = llvm::GlobalValue::PrivateLinkage; 1826 isConstant = !Features.WritableStrings; 1827 1828 llvm::GlobalVariable *GV = 1829 new llvm::GlobalVariable(getModule(), C->getType(), isConstant, Linkage, C, 1830 ".str"); 1831 GV->setUnnamedAddr(true); 1832 CharUnits Align = getContext().getTypeAlignInChars(getContext().CharTy); 1833 GV->setAlignment(Align.getQuantity()); 1834 Fields[1] = llvm::ConstantExpr::getGetElementPtr(GV, Zeros, 2); 1835 1836 // String length. 1837 const llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy); 1838 Fields[2] = llvm::ConstantInt::get(Ty, StringLength); 1839 1840 // The struct. 1841 C = llvm::ConstantStruct::get(STy, Fields); 1842 GV = new llvm::GlobalVariable(getModule(), C->getType(), true, 1843 llvm::GlobalVariable::PrivateLinkage, C, 1844 "_unnamed_nsstring_"); 1845 // FIXME. Fix section. 1846 if (const char *Sect = 1847 Features.ObjCNonFragileABI 1848 ? getContext().Target.getNSStringNonFragileABISection() 1849 : getContext().Target.getNSStringSection()) 1850 GV->setSection(Sect); 1851 Entry.setValue(GV); 1852 1853 return GV; 1854} 1855 1856/// GetStringForStringLiteral - Return the appropriate bytes for a 1857/// string literal, properly padded to match the literal type. 1858std::string CodeGenModule::GetStringForStringLiteral(const StringLiteral *E) { 1859 const ASTContext &Context = getContext(); 1860 const ConstantArrayType *CAT = 1861 Context.getAsConstantArrayType(E->getType()); 1862 assert(CAT && "String isn't pointer or array!"); 1863 1864 // Resize the string to the right size. 1865 uint64_t RealLen = CAT->getSize().getZExtValue(); 1866 1867 if (E->isWide()) 1868 RealLen *= Context.Target.getWCharWidth() / Context.getCharWidth(); 1869 1870 std::string Str = E->getString().str(); 1871 Str.resize(RealLen, '\0'); 1872 1873 return Str; 1874} 1875 1876/// GetAddrOfConstantStringFromLiteral - Return a pointer to a 1877/// constant array for the given string literal. 1878llvm::Constant * 1879CodeGenModule::GetAddrOfConstantStringFromLiteral(const StringLiteral *S) { 1880 // FIXME: This can be more efficient. 1881 // FIXME: We shouldn't need to bitcast the constant in the wide string case. 1882 llvm::Constant *C = GetAddrOfConstantString(GetStringForStringLiteral(S)); 1883 if (S->isWide()) { 1884 llvm::Type *DestTy = 1885 llvm::PointerType::getUnqual(getTypes().ConvertType(S->getType())); 1886 C = llvm::ConstantExpr::getBitCast(C, DestTy); 1887 } 1888 return C; 1889} 1890 1891/// GetAddrOfConstantStringFromObjCEncode - Return a pointer to a constant 1892/// array for the given ObjCEncodeExpr node. 1893llvm::Constant * 1894CodeGenModule::GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *E) { 1895 std::string Str; 1896 getContext().getObjCEncodingForType(E->getEncodedType(), Str); 1897 1898 return GetAddrOfConstantCString(Str); 1899} 1900 1901 1902/// GenerateWritableString -- Creates storage for a string literal. 1903static llvm::Constant *GenerateStringLiteral(llvm::StringRef str, 1904 bool constant, 1905 CodeGenModule &CGM, 1906 const char *GlobalName) { 1907 // Create Constant for this string literal. Don't add a '\0'. 1908 llvm::Constant *C = 1909 llvm::ConstantArray::get(CGM.getLLVMContext(), str, false); 1910 1911 // Create a global variable for this string 1912 llvm::GlobalVariable *GV = 1913 new llvm::GlobalVariable(CGM.getModule(), C->getType(), constant, 1914 llvm::GlobalValue::PrivateLinkage, 1915 C, GlobalName); 1916 GV->setAlignment(1); 1917 GV->setUnnamedAddr(true); 1918 return GV; 1919} 1920 1921/// GetAddrOfConstantString - Returns a pointer to a character array 1922/// containing the literal. This contents are exactly that of the 1923/// given string, i.e. it will not be null terminated automatically; 1924/// see GetAddrOfConstantCString. Note that whether the result is 1925/// actually a pointer to an LLVM constant depends on 1926/// Feature.WriteableStrings. 1927/// 1928/// The result has pointer to array type. 1929llvm::Constant *CodeGenModule::GetAddrOfConstantString(llvm::StringRef Str, 1930 const char *GlobalName) { 1931 bool IsConstant = !Features.WritableStrings; 1932 1933 // Get the default prefix if a name wasn't specified. 1934 if (!GlobalName) 1935 GlobalName = ".str"; 1936 1937 // Don't share any string literals if strings aren't constant. 1938 if (!IsConstant) 1939 return GenerateStringLiteral(Str, false, *this, GlobalName); 1940 1941 llvm::StringMapEntry<llvm::Constant *> &Entry = 1942 ConstantStringMap.GetOrCreateValue(Str); 1943 1944 if (Entry.getValue()) 1945 return Entry.getValue(); 1946 1947 // Create a global variable for this. 1948 llvm::Constant *C = GenerateStringLiteral(Str, true, *this, GlobalName); 1949 Entry.setValue(C); 1950 return C; 1951} 1952 1953/// GetAddrOfConstantCString - Returns a pointer to a character 1954/// array containing the literal and a terminating '\0' 1955/// character. The result has pointer to array type. 1956llvm::Constant *CodeGenModule::GetAddrOfConstantCString(const std::string &Str, 1957 const char *GlobalName){ 1958 llvm::StringRef StrWithNull(Str.c_str(), Str.size() + 1); 1959 return GetAddrOfConstantString(StrWithNull, GlobalName); 1960} 1961 1962/// EmitObjCPropertyImplementations - Emit information for synthesized 1963/// properties for an implementation. 1964void CodeGenModule::EmitObjCPropertyImplementations(const 1965 ObjCImplementationDecl *D) { 1966 for (ObjCImplementationDecl::propimpl_iterator 1967 i = D->propimpl_begin(), e = D->propimpl_end(); i != e; ++i) { 1968 ObjCPropertyImplDecl *PID = *i; 1969 1970 // Dynamic is just for type-checking. 1971 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) { 1972 ObjCPropertyDecl *PD = PID->getPropertyDecl(); 1973 1974 // Determine which methods need to be implemented, some may have 1975 // been overridden. Note that ::isSynthesized is not the method 1976 // we want, that just indicates if the decl came from a 1977 // property. What we want to know is if the method is defined in 1978 // this implementation. 1979 if (!D->getInstanceMethod(PD->getGetterName())) 1980 CodeGenFunction(*this).GenerateObjCGetter( 1981 const_cast<ObjCImplementationDecl *>(D), PID); 1982 if (!PD->isReadOnly() && 1983 !D->getInstanceMethod(PD->getSetterName())) 1984 CodeGenFunction(*this).GenerateObjCSetter( 1985 const_cast<ObjCImplementationDecl *>(D), PID); 1986 } 1987 } 1988} 1989 1990static bool needsDestructMethod(ObjCImplementationDecl *impl) { 1991 ObjCInterfaceDecl *iface 1992 = const_cast<ObjCInterfaceDecl*>(impl->getClassInterface()); 1993 for (ObjCIvarDecl *ivar = iface->all_declared_ivar_begin(); 1994 ivar; ivar = ivar->getNextIvar()) 1995 if (ivar->getType().isDestructedType()) 1996 return true; 1997 1998 return false; 1999} 2000 2001/// EmitObjCIvarInitializations - Emit information for ivar initialization 2002/// for an implementation. 2003void CodeGenModule::EmitObjCIvarInitializations(ObjCImplementationDecl *D) { 2004 // We might need a .cxx_destruct even if we don't have any ivar initializers. 2005 if (needsDestructMethod(D)) { 2006 IdentifierInfo *II = &getContext().Idents.get(".cxx_destruct"); 2007 Selector cxxSelector = getContext().Selectors.getSelector(0, &II); 2008 ObjCMethodDecl *DTORMethod = 2009 ObjCMethodDecl::Create(getContext(), D->getLocation(), D->getLocation(), 2010 cxxSelector, getContext().VoidTy, 0, D, true, 2011 false, true, false, ObjCMethodDecl::Required); 2012 D->addInstanceMethod(DTORMethod); 2013 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, DTORMethod, false); 2014 D->setHasCXXStructors(true); 2015 } 2016 2017 // If the implementation doesn't have any ivar initializers, we don't need 2018 // a .cxx_construct. 2019 if (D->getNumIvarInitializers() == 0) 2020 return; 2021 2022 IdentifierInfo *II = &getContext().Idents.get(".cxx_construct"); 2023 Selector cxxSelector = getContext().Selectors.getSelector(0, &II); 2024 // The constructor returns 'self'. 2025 ObjCMethodDecl *CTORMethod = ObjCMethodDecl::Create(getContext(), 2026 D->getLocation(), 2027 D->getLocation(), cxxSelector, 2028 getContext().getObjCIdType(), 0, 2029 D, true, false, true, false, 2030 ObjCMethodDecl::Required); 2031 D->addInstanceMethod(CTORMethod); 2032 CodeGenFunction(*this).GenerateObjCCtorDtorMethod(D, CTORMethod, true); 2033 D->setHasCXXStructors(true); 2034} 2035 2036/// EmitNamespace - Emit all declarations in a namespace. 2037void CodeGenModule::EmitNamespace(const NamespaceDecl *ND) { 2038 for (RecordDecl::decl_iterator I = ND->decls_begin(), E = ND->decls_end(); 2039 I != E; ++I) 2040 EmitTopLevelDecl(*I); 2041} 2042 2043// EmitLinkageSpec - Emit all declarations in a linkage spec. 2044void CodeGenModule::EmitLinkageSpec(const LinkageSpecDecl *LSD) { 2045 if (LSD->getLanguage() != LinkageSpecDecl::lang_c && 2046 LSD->getLanguage() != LinkageSpecDecl::lang_cxx) { 2047 ErrorUnsupported(LSD, "linkage spec"); 2048 return; 2049 } 2050 2051 for (RecordDecl::decl_iterator I = LSD->decls_begin(), E = LSD->decls_end(); 2052 I != E; ++I) 2053 EmitTopLevelDecl(*I); 2054} 2055 2056/// EmitTopLevelDecl - Emit code for a single top level declaration. 2057void CodeGenModule::EmitTopLevelDecl(Decl *D) { 2058 // If an error has occurred, stop code generation, but continue 2059 // parsing and semantic analysis (to ensure all warnings and errors 2060 // are emitted). 2061 if (Diags.hasErrorOccurred()) 2062 return; 2063 2064 // Ignore dependent declarations. 2065 if (D->getDeclContext() && D->getDeclContext()->isDependentContext()) 2066 return; 2067 2068 switch (D->getKind()) { 2069 case Decl::CXXConversion: 2070 case Decl::CXXMethod: 2071 case Decl::Function: 2072 // Skip function templates 2073 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() || 2074 cast<FunctionDecl>(D)->isLateTemplateParsed()) 2075 return; 2076 2077 EmitGlobal(cast<FunctionDecl>(D)); 2078 break; 2079 2080 case Decl::Var: 2081 EmitGlobal(cast<VarDecl>(D)); 2082 break; 2083 2084 // Indirect fields from global anonymous structs and unions can be 2085 // ignored; only the actual variable requires IR gen support. 2086 case Decl::IndirectField: 2087 break; 2088 2089 // C++ Decls 2090 case Decl::Namespace: 2091 EmitNamespace(cast<NamespaceDecl>(D)); 2092 break; 2093 // No code generation needed. 2094 case Decl::UsingShadow: 2095 case Decl::Using: 2096 case Decl::UsingDirective: 2097 case Decl::ClassTemplate: 2098 case Decl::FunctionTemplate: 2099 case Decl::TypeAliasTemplate: 2100 case Decl::NamespaceAlias: 2101 case Decl::Block: 2102 break; 2103 case Decl::CXXConstructor: 2104 // Skip function templates 2105 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() || 2106 cast<FunctionDecl>(D)->isLateTemplateParsed()) 2107 return; 2108 2109 EmitCXXConstructors(cast<CXXConstructorDecl>(D)); 2110 break; 2111 case Decl::CXXDestructor: 2112 if (cast<FunctionDecl>(D)->isLateTemplateParsed()) 2113 return; 2114 EmitCXXDestructors(cast<CXXDestructorDecl>(D)); 2115 break; 2116 2117 case Decl::StaticAssert: 2118 // Nothing to do. 2119 break; 2120 2121 // Objective-C Decls 2122 2123 // Forward declarations, no (immediate) code generation. 2124 case Decl::ObjCClass: 2125 case Decl::ObjCForwardProtocol: 2126 case Decl::ObjCInterface: 2127 break; 2128 2129 case Decl::ObjCCategory: { 2130 ObjCCategoryDecl *CD = cast<ObjCCategoryDecl>(D); 2131 if (CD->IsClassExtension() && CD->hasSynthBitfield()) 2132 Context.ResetObjCLayout(CD->getClassInterface()); 2133 break; 2134 } 2135 2136 case Decl::ObjCProtocol: 2137 Runtime->GenerateProtocol(cast<ObjCProtocolDecl>(D)); 2138 break; 2139 2140 case Decl::ObjCCategoryImpl: 2141 // Categories have properties but don't support synthesize so we 2142 // can ignore them here. 2143 Runtime->GenerateCategory(cast<ObjCCategoryImplDecl>(D)); 2144 break; 2145 2146 case Decl::ObjCImplementation: { 2147 ObjCImplementationDecl *OMD = cast<ObjCImplementationDecl>(D); 2148 if (Features.ObjCNonFragileABI2 && OMD->hasSynthBitfield()) 2149 Context.ResetObjCLayout(OMD->getClassInterface()); 2150 EmitObjCPropertyImplementations(OMD); 2151 EmitObjCIvarInitializations(OMD); 2152 Runtime->GenerateClass(OMD); 2153 break; 2154 } 2155 case Decl::ObjCMethod: { 2156 ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(D); 2157 // If this is not a prototype, emit the body. 2158 if (OMD->getBody()) 2159 CodeGenFunction(*this).GenerateObjCMethod(OMD); 2160 break; 2161 } 2162 case Decl::ObjCCompatibleAlias: 2163 // compatibility-alias is a directive and has no code gen. 2164 break; 2165 2166 case Decl::LinkageSpec: 2167 EmitLinkageSpec(cast<LinkageSpecDecl>(D)); 2168 break; 2169 2170 case Decl::FileScopeAsm: { 2171 FileScopeAsmDecl *AD = cast<FileScopeAsmDecl>(D); 2172 llvm::StringRef AsmString = AD->getAsmString()->getString(); 2173 2174 const std::string &S = getModule().getModuleInlineAsm(); 2175 if (S.empty()) 2176 getModule().setModuleInlineAsm(AsmString); 2177 else 2178 getModule().setModuleInlineAsm(S + '\n' + AsmString.str()); 2179 break; 2180 } 2181 2182 default: 2183 // Make sure we handled everything we should, every other kind is a 2184 // non-top-level decl. FIXME: Would be nice to have an isTopLevelDeclKind 2185 // function. Need to recode Decl::Kind to do that easily. 2186 assert(isa<TypeDecl>(D) && "Unsupported decl kind"); 2187 } 2188} 2189 2190/// Turns the given pointer into a constant. 2191static llvm::Constant *GetPointerConstant(llvm::LLVMContext &Context, 2192 const void *Ptr) { 2193 uintptr_t PtrInt = reinterpret_cast<uintptr_t>(Ptr); 2194 const llvm::Type *i64 = llvm::Type::getInt64Ty(Context); 2195 return llvm::ConstantInt::get(i64, PtrInt); 2196} 2197 2198static void EmitGlobalDeclMetadata(CodeGenModule &CGM, 2199 llvm::NamedMDNode *&GlobalMetadata, 2200 GlobalDecl D, 2201 llvm::GlobalValue *Addr) { 2202 if (!GlobalMetadata) 2203 GlobalMetadata = 2204 CGM.getModule().getOrInsertNamedMetadata("clang.global.decl.ptrs"); 2205 2206 // TODO: should we report variant information for ctors/dtors? 2207 llvm::Value *Ops[] = { 2208 Addr, 2209 GetPointerConstant(CGM.getLLVMContext(), D.getDecl()) 2210 }; 2211 GlobalMetadata->addOperand(llvm::MDNode::get(CGM.getLLVMContext(), Ops)); 2212} 2213 2214/// Emits metadata nodes associating all the global values in the 2215/// current module with the Decls they came from. This is useful for 2216/// projects using IR gen as a subroutine. 2217/// 2218/// Since there's currently no way to associate an MDNode directly 2219/// with an llvm::GlobalValue, we create a global named metadata 2220/// with the name 'clang.global.decl.ptrs'. 2221void CodeGenModule::EmitDeclMetadata() { 2222 llvm::NamedMDNode *GlobalMetadata = 0; 2223 2224 // StaticLocalDeclMap 2225 for (llvm::DenseMap<GlobalDecl,llvm::StringRef>::iterator 2226 I = MangledDeclNames.begin(), E = MangledDeclNames.end(); 2227 I != E; ++I) { 2228 llvm::GlobalValue *Addr = getModule().getNamedValue(I->second); 2229 EmitGlobalDeclMetadata(*this, GlobalMetadata, I->first, Addr); 2230 } 2231} 2232 2233/// Emits metadata nodes for all the local variables in the current 2234/// function. 2235void CodeGenFunction::EmitDeclMetadata() { 2236 if (LocalDeclMap.empty()) return; 2237 2238 llvm::LLVMContext &Context = getLLVMContext(); 2239 2240 // Find the unique metadata ID for this name. 2241 unsigned DeclPtrKind = Context.getMDKindID("clang.decl.ptr"); 2242 2243 llvm::NamedMDNode *GlobalMetadata = 0; 2244 2245 for (llvm::DenseMap<const Decl*, llvm::Value*>::iterator 2246 I = LocalDeclMap.begin(), E = LocalDeclMap.end(); I != E; ++I) { 2247 const Decl *D = I->first; 2248 llvm::Value *Addr = I->second; 2249 2250 if (llvm::AllocaInst *Alloca = dyn_cast<llvm::AllocaInst>(Addr)) { 2251 llvm::Value *DAddr = GetPointerConstant(getLLVMContext(), D); 2252 Alloca->setMetadata(DeclPtrKind, llvm::MDNode::get(Context, DAddr)); 2253 } else if (llvm::GlobalValue *GV = dyn_cast<llvm::GlobalValue>(Addr)) { 2254 GlobalDecl GD = GlobalDecl(cast<VarDecl>(D)); 2255 EmitGlobalDeclMetadata(CGM, GlobalMetadata, GD, GV); 2256 } 2257 } 2258} 2259 2260void CodeGenModule::EmitCoverageFile() { 2261 if (!getCodeGenOpts().CoverageFile.empty()) { 2262 if (llvm::NamedMDNode *CUNode = TheModule.getNamedMetadata("llvm.dbg.cu")) { 2263 llvm::NamedMDNode *GCov = TheModule.getOrInsertNamedMetadata("llvm.gcov"); 2264 llvm::LLVMContext &Ctx = TheModule.getContext(); 2265 llvm::MDString *CoverageFile = 2266 llvm::MDString::get(Ctx, getCodeGenOpts().CoverageFile); 2267 for (int i = 0, e = CUNode->getNumOperands(); i != e; ++i) { 2268 llvm::MDNode *CU = CUNode->getOperand(i); 2269 llvm::Value *node[] = { CoverageFile, CU }; 2270 llvm::MDNode *N = llvm::MDNode::get(Ctx, node); 2271 GCov->addOperand(N); 2272 } 2273 } 2274 } 2275} 2276 2277///@name Custom Runtime Function Interfaces 2278///@{ 2279// 2280// FIXME: These can be eliminated once we can have clients just get the required 2281// AST nodes from the builtin tables. 2282 2283llvm::Constant *CodeGenModule::getBlockObjectDispose() { 2284 if (BlockObjectDispose) 2285 return BlockObjectDispose; 2286 2287 // If we saw an explicit decl, use that. 2288 if (BlockObjectDisposeDecl) { 2289 return BlockObjectDispose = GetAddrOfFunction( 2290 BlockObjectDisposeDecl, 2291 getTypes().GetFunctionType(BlockObjectDisposeDecl)); 2292 } 2293 2294 // Otherwise construct the function by hand. 2295 llvm::Type *args[] = { Int8PtrTy, Int32Ty }; 2296 const llvm::FunctionType *fty 2297 = llvm::FunctionType::get(VoidTy, args, false); 2298 return BlockObjectDispose = 2299 CreateRuntimeFunction(fty, "_Block_object_dispose"); 2300} 2301 2302llvm::Constant *CodeGenModule::getBlockObjectAssign() { 2303 if (BlockObjectAssign) 2304 return BlockObjectAssign; 2305 2306 // If we saw an explicit decl, use that. 2307 if (BlockObjectAssignDecl) { 2308 return BlockObjectAssign = GetAddrOfFunction( 2309 BlockObjectAssignDecl, 2310 getTypes().GetFunctionType(BlockObjectAssignDecl)); 2311 } 2312 2313 // Otherwise construct the function by hand. 2314 llvm::Type *args[] = { Int8PtrTy, Int8PtrTy, Int32Ty }; 2315 const llvm::FunctionType *fty 2316 = llvm::FunctionType::get(VoidTy, args, false); 2317 return BlockObjectAssign = 2318 CreateRuntimeFunction(fty, "_Block_object_assign"); 2319} 2320 2321llvm::Constant *CodeGenModule::getNSConcreteGlobalBlock() { 2322 if (NSConcreteGlobalBlock) 2323 return NSConcreteGlobalBlock; 2324 2325 // If we saw an explicit decl, use that. 2326 if (NSConcreteGlobalBlockDecl) { 2327 return NSConcreteGlobalBlock = GetAddrOfGlobalVar( 2328 NSConcreteGlobalBlockDecl, 2329 getTypes().ConvertType(NSConcreteGlobalBlockDecl->getType())); 2330 } 2331 2332 // Otherwise construct the variable by hand. 2333 return NSConcreteGlobalBlock = 2334 CreateRuntimeVariable(Int8PtrTy, "_NSConcreteGlobalBlock"); 2335} 2336 2337llvm::Constant *CodeGenModule::getNSConcreteStackBlock() { 2338 if (NSConcreteStackBlock) 2339 return NSConcreteStackBlock; 2340 2341 // If we saw an explicit decl, use that. 2342 if (NSConcreteStackBlockDecl) { 2343 return NSConcreteStackBlock = GetAddrOfGlobalVar( 2344 NSConcreteStackBlockDecl, 2345 getTypes().ConvertType(NSConcreteStackBlockDecl->getType())); 2346 } 2347 2348 // Otherwise construct the variable by hand. 2349 return NSConcreteStackBlock = 2350 CreateRuntimeVariable(Int8PtrTy, "_NSConcreteStackBlock"); 2351} 2352 2353///@} 2354