CodeGenModule.cpp revision 200583
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 "CGCall.h" 18#include "CGObjCRuntime.h" 19#include "Mangle.h" 20#include "clang/CodeGen/CodeGenOptions.h" 21#include "clang/AST/ASTContext.h" 22#include "clang/AST/DeclObjC.h" 23#include "clang/AST/DeclCXX.h" 24#include "clang/AST/RecordLayout.h" 25#include "clang/Basic/Builtins.h" 26#include "clang/Basic/Diagnostic.h" 27#include "clang/Basic/SourceManager.h" 28#include "clang/Basic/TargetInfo.h" 29#include "clang/Basic/ConvertUTF.h" 30#include "llvm/CallingConv.h" 31#include "llvm/Module.h" 32#include "llvm/Intrinsics.h" 33#include "llvm/Target/TargetData.h" 34#include "llvm/Support/ErrorHandling.h" 35using namespace clang; 36using namespace CodeGen; 37 38 39CodeGenModule::CodeGenModule(ASTContext &C, const CodeGenOptions &CGO, 40 llvm::Module &M, const llvm::TargetData &TD, 41 Diagnostic &diags) 42 : BlockModule(C, M, TD, Types, *this), Context(C), 43 Features(C.getLangOptions()), CodeGenOpts(CGO), TheModule(M), 44 TheTargetData(TD), Diags(diags), Types(C, M, TD), MangleCtx(C), 45 VtableInfo(*this), Runtime(0), 46 MemCpyFn(0), MemMoveFn(0), MemSetFn(0), CFConstantStringClassRef(0), 47 VMContext(M.getContext()) { 48 49 if (!Features.ObjC1) 50 Runtime = 0; 51 else if (!Features.NeXTRuntime) 52 Runtime = CreateGNUObjCRuntime(*this); 53 else if (Features.ObjCNonFragileABI) 54 Runtime = CreateMacNonFragileABIObjCRuntime(*this); 55 else 56 Runtime = CreateMacObjCRuntime(*this); 57 58 // If debug info generation is enabled, create the CGDebugInfo object. 59 DebugInfo = CodeGenOpts.DebugInfo ? new CGDebugInfo(*this) : 0; 60} 61 62CodeGenModule::~CodeGenModule() { 63 delete Runtime; 64 delete DebugInfo; 65} 66 67void CodeGenModule::Release() { 68 // We need to call this first because it can add deferred declarations. 69 EmitCXXGlobalInitFunc(); 70 71 EmitDeferred(); 72 if (Runtime) 73 if (llvm::Function *ObjCInitFunction = Runtime->ModuleInitFunction()) 74 AddGlobalCtor(ObjCInitFunction); 75 EmitCtorList(GlobalCtors, "llvm.global_ctors"); 76 EmitCtorList(GlobalDtors, "llvm.global_dtors"); 77 EmitAnnotations(); 78 EmitLLVMUsed(); 79} 80 81/// ErrorUnsupported - Print out an error that codegen doesn't support the 82/// specified stmt yet. 83void CodeGenModule::ErrorUnsupported(const Stmt *S, const char *Type, 84 bool OmitOnError) { 85 if (OmitOnError && getDiags().hasErrorOccurred()) 86 return; 87 unsigned DiagID = getDiags().getCustomDiagID(Diagnostic::Error, 88 "cannot compile this %0 yet"); 89 std::string Msg = Type; 90 getDiags().Report(Context.getFullLoc(S->getLocStart()), DiagID) 91 << Msg << S->getSourceRange(); 92} 93 94/// ErrorUnsupported - Print out an error that codegen doesn't support the 95/// specified decl yet. 96void CodeGenModule::ErrorUnsupported(const Decl *D, const char *Type, 97 bool OmitOnError) { 98 if (OmitOnError && getDiags().hasErrorOccurred()) 99 return; 100 unsigned DiagID = getDiags().getCustomDiagID(Diagnostic::Error, 101 "cannot compile this %0 yet"); 102 std::string Msg = Type; 103 getDiags().Report(Context.getFullLoc(D->getLocation()), DiagID) << Msg; 104} 105 106LangOptions::VisibilityMode 107CodeGenModule::getDeclVisibilityMode(const Decl *D) const { 108 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 109 if (VD->getStorageClass() == VarDecl::PrivateExtern) 110 return LangOptions::Hidden; 111 112 if (const VisibilityAttr *attr = D->getAttr<VisibilityAttr>()) { 113 switch (attr->getVisibility()) { 114 default: assert(0 && "Unknown visibility!"); 115 case VisibilityAttr::DefaultVisibility: 116 return LangOptions::Default; 117 case VisibilityAttr::HiddenVisibility: 118 return LangOptions::Hidden; 119 case VisibilityAttr::ProtectedVisibility: 120 return LangOptions::Protected; 121 } 122 } 123 124 return getLangOptions().getVisibilityMode(); 125} 126 127void CodeGenModule::setGlobalVisibility(llvm::GlobalValue *GV, 128 const Decl *D) const { 129 // Internal definitions always have default visibility. 130 if (GV->hasLocalLinkage()) { 131 GV->setVisibility(llvm::GlobalValue::DefaultVisibility); 132 return; 133 } 134 135 switch (getDeclVisibilityMode(D)) { 136 default: assert(0 && "Unknown visibility!"); 137 case LangOptions::Default: 138 return GV->setVisibility(llvm::GlobalValue::DefaultVisibility); 139 case LangOptions::Hidden: 140 return GV->setVisibility(llvm::GlobalValue::HiddenVisibility); 141 case LangOptions::Protected: 142 return GV->setVisibility(llvm::GlobalValue::ProtectedVisibility); 143 } 144} 145 146const char *CodeGenModule::getMangledName(const GlobalDecl &GD) { 147 const NamedDecl *ND = cast<NamedDecl>(GD.getDecl()); 148 149 if (const CXXConstructorDecl *D = dyn_cast<CXXConstructorDecl>(ND)) 150 return getMangledCXXCtorName(D, GD.getCtorType()); 151 if (const CXXDestructorDecl *D = dyn_cast<CXXDestructorDecl>(ND)) 152 return getMangledCXXDtorName(D, GD.getDtorType()); 153 154 return getMangledName(ND); 155} 156 157/// \brief Retrieves the mangled name for the given declaration. 158/// 159/// If the given declaration requires a mangled name, returns an 160/// const char* containing the mangled name. Otherwise, returns 161/// the unmangled name. 162/// 163const char *CodeGenModule::getMangledName(const NamedDecl *ND) { 164 if (!getMangleContext().shouldMangleDeclName(ND)) { 165 assert(ND->getIdentifier() && "Attempt to mangle unnamed decl."); 166 return ND->getNameAsCString(); 167 } 168 169 llvm::SmallString<256> Name; 170 getMangleContext().mangleName(ND, Name); 171 Name += '\0'; 172 return UniqueMangledName(Name.begin(), Name.end()); 173} 174 175const char *CodeGenModule::UniqueMangledName(const char *NameStart, 176 const char *NameEnd) { 177 assert(*(NameEnd - 1) == '\0' && "Mangled name must be null terminated!"); 178 179 return MangledNames.GetOrCreateValue(NameStart, NameEnd).getKeyData(); 180} 181 182/// AddGlobalCtor - Add a function to the list that will be called before 183/// main() runs. 184void CodeGenModule::AddGlobalCtor(llvm::Function * Ctor, int Priority) { 185 // FIXME: Type coercion of void()* types. 186 GlobalCtors.push_back(std::make_pair(Ctor, Priority)); 187} 188 189/// AddGlobalDtor - Add a function to the list that will be called 190/// when the module is unloaded. 191void CodeGenModule::AddGlobalDtor(llvm::Function * Dtor, int Priority) { 192 // FIXME: Type coercion of void()* types. 193 GlobalDtors.push_back(std::make_pair(Dtor, Priority)); 194} 195 196void CodeGenModule::EmitCtorList(const CtorList &Fns, const char *GlobalName) { 197 // Ctor function type is void()*. 198 llvm::FunctionType* CtorFTy = 199 llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), 200 std::vector<const llvm::Type*>(), 201 false); 202 llvm::Type *CtorPFTy = llvm::PointerType::getUnqual(CtorFTy); 203 204 // Get the type of a ctor entry, { i32, void ()* }. 205 llvm::StructType* CtorStructTy = 206 llvm::StructType::get(VMContext, llvm::Type::getInt32Ty(VMContext), 207 llvm::PointerType::getUnqual(CtorFTy), NULL); 208 209 // Construct the constructor and destructor arrays. 210 std::vector<llvm::Constant*> Ctors; 211 for (CtorList::const_iterator I = Fns.begin(), E = Fns.end(); I != E; ++I) { 212 std::vector<llvm::Constant*> S; 213 S.push_back(llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), 214 I->second, false)); 215 S.push_back(llvm::ConstantExpr::getBitCast(I->first, CtorPFTy)); 216 Ctors.push_back(llvm::ConstantStruct::get(CtorStructTy, S)); 217 } 218 219 if (!Ctors.empty()) { 220 llvm::ArrayType *AT = llvm::ArrayType::get(CtorStructTy, Ctors.size()); 221 new llvm::GlobalVariable(TheModule, AT, false, 222 llvm::GlobalValue::AppendingLinkage, 223 llvm::ConstantArray::get(AT, Ctors), 224 GlobalName); 225 } 226} 227 228void CodeGenModule::EmitAnnotations() { 229 if (Annotations.empty()) 230 return; 231 232 // Create a new global variable for the ConstantStruct in the Module. 233 llvm::Constant *Array = 234 llvm::ConstantArray::get(llvm::ArrayType::get(Annotations[0]->getType(), 235 Annotations.size()), 236 Annotations); 237 llvm::GlobalValue *gv = 238 new llvm::GlobalVariable(TheModule, Array->getType(), false, 239 llvm::GlobalValue::AppendingLinkage, Array, 240 "llvm.global.annotations"); 241 gv->setSection("llvm.metadata"); 242} 243 244static CodeGenModule::GVALinkage 245GetLinkageForFunction(ASTContext &Context, const FunctionDecl *FD, 246 const LangOptions &Features) { 247 // Everything located semantically within an anonymous namespace is 248 // always internal. 249 if (FD->isInAnonymousNamespace()) 250 return CodeGenModule::GVA_Internal; 251 252 // "static" functions get internal linkage. 253 if (FD->getStorageClass() == FunctionDecl::Static && !isa<CXXMethodDecl>(FD)) 254 return CodeGenModule::GVA_Internal; 255 256 // The kind of external linkage this function will have, if it is not 257 // inline or static. 258 CodeGenModule::GVALinkage External = CodeGenModule::GVA_StrongExternal; 259 if (Context.getLangOptions().CPlusPlus) { 260 TemplateSpecializationKind TSK = FD->getTemplateSpecializationKind(); 261 262 if (TSK == TSK_ExplicitInstantiationDefinition) { 263 // If a function has been explicitly instantiated, then it should 264 // always have strong external linkage. 265 return CodeGenModule::GVA_StrongExternal; 266 } 267 268 if (TSK == TSK_ImplicitInstantiation) 269 External = CodeGenModule::GVA_TemplateInstantiation; 270 } 271 272 if (!FD->isInlined()) 273 return External; 274 275 if (!Features.CPlusPlus || FD->hasAttr<GNUInlineAttr>()) { 276 // GNU or C99 inline semantics. Determine whether this symbol should be 277 // externally visible. 278 if (FD->isInlineDefinitionExternallyVisible()) 279 return External; 280 281 // C99 inline semantics, where the symbol is not externally visible. 282 return CodeGenModule::GVA_C99Inline; 283 } 284 285 // C++0x [temp.explicit]p9: 286 // [ Note: The intent is that an inline function that is the subject of 287 // an explicit instantiation declaration will still be implicitly 288 // instantiated when used so that the body can be considered for 289 // inlining, but that no out-of-line copy of the inline function would be 290 // generated in the translation unit. -- end note ] 291 if (FD->getTemplateSpecializationKind() 292 == TSK_ExplicitInstantiationDeclaration) 293 return CodeGenModule::GVA_C99Inline; 294 295 return CodeGenModule::GVA_CXXInline; 296} 297 298/// SetFunctionDefinitionAttributes - Set attributes for a global. 299/// 300/// FIXME: This is currently only done for aliases and functions, but not for 301/// variables (these details are set in EmitGlobalVarDefinition for variables). 302void CodeGenModule::SetFunctionDefinitionAttributes(const FunctionDecl *D, 303 llvm::GlobalValue *GV) { 304 GVALinkage Linkage = GetLinkageForFunction(getContext(), D, Features); 305 306 if (Linkage == GVA_Internal) { 307 GV->setLinkage(llvm::Function::InternalLinkage); 308 } else if (D->hasAttr<DLLExportAttr>()) { 309 GV->setLinkage(llvm::Function::DLLExportLinkage); 310 } else if (D->hasAttr<WeakAttr>()) { 311 GV->setLinkage(llvm::Function::WeakAnyLinkage); 312 } else if (Linkage == GVA_C99Inline) { 313 // In C99 mode, 'inline' functions are guaranteed to have a strong 314 // definition somewhere else, so we can use available_externally linkage. 315 GV->setLinkage(llvm::Function::AvailableExternallyLinkage); 316 } else if (Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation) { 317 // In C++, the compiler has to emit a definition in every translation unit 318 // that references the function. We should use linkonce_odr because 319 // a) if all references in this translation unit are optimized away, we 320 // don't need to codegen it. b) if the function persists, it needs to be 321 // merged with other definitions. c) C++ has the ODR, so we know the 322 // definition is dependable. 323 GV->setLinkage(llvm::Function::LinkOnceODRLinkage); 324 } else { 325 assert(Linkage == GVA_StrongExternal); 326 // Otherwise, we have strong external linkage. 327 GV->setLinkage(llvm::Function::ExternalLinkage); 328 } 329 330 SetCommonAttributes(D, GV); 331} 332 333void CodeGenModule::SetLLVMFunctionAttributes(const Decl *D, 334 const CGFunctionInfo &Info, 335 llvm::Function *F) { 336 unsigned CallingConv; 337 AttributeListType AttributeList; 338 ConstructAttributeList(Info, D, AttributeList, CallingConv); 339 F->setAttributes(llvm::AttrListPtr::get(AttributeList.begin(), 340 AttributeList.size())); 341 F->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv)); 342} 343 344void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D, 345 llvm::Function *F) { 346 if (!Features.Exceptions && !Features.ObjCNonFragileABI) 347 F->addFnAttr(llvm::Attribute::NoUnwind); 348 349 if (D->hasAttr<AlwaysInlineAttr>()) 350 F->addFnAttr(llvm::Attribute::AlwaysInline); 351 352 if (D->hasAttr<NoInlineAttr>()) 353 F->addFnAttr(llvm::Attribute::NoInline); 354 355 if (Features.getStackProtectorMode() == LangOptions::SSPOn) 356 F->addFnAttr(llvm::Attribute::StackProtect); 357 else if (Features.getStackProtectorMode() == LangOptions::SSPReq) 358 F->addFnAttr(llvm::Attribute::StackProtectReq); 359 360 if (const AlignedAttr *AA = D->getAttr<AlignedAttr>()) { 361 unsigned width = Context.Target.getCharWidth(); 362 F->setAlignment(AA->getAlignment() / width); 363 while ((AA = AA->getNext<AlignedAttr>())) 364 F->setAlignment(std::max(F->getAlignment(), AA->getAlignment() / width)); 365 } 366 // C++ ABI requires 2-byte alignment for member functions. 367 if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D)) 368 F->setAlignment(2); 369} 370 371void CodeGenModule::SetCommonAttributes(const Decl *D, 372 llvm::GlobalValue *GV) { 373 setGlobalVisibility(GV, D); 374 375 if (D->hasAttr<UsedAttr>()) 376 AddUsedGlobal(GV); 377 378 if (const SectionAttr *SA = D->getAttr<SectionAttr>()) 379 GV->setSection(SA->getName()); 380} 381 382void CodeGenModule::SetInternalFunctionAttributes(const Decl *D, 383 llvm::Function *F, 384 const CGFunctionInfo &FI) { 385 SetLLVMFunctionAttributes(D, FI, F); 386 SetLLVMFunctionAttributesForDefinition(D, F); 387 388 F->setLinkage(llvm::Function::InternalLinkage); 389 390 SetCommonAttributes(D, F); 391} 392 393void CodeGenModule::SetFunctionAttributes(const FunctionDecl *FD, 394 llvm::Function *F, 395 bool IsIncompleteFunction) { 396 if (!IsIncompleteFunction) 397 SetLLVMFunctionAttributes(FD, getTypes().getFunctionInfo(FD), F); 398 399 // Only a few attributes are set on declarations; these may later be 400 // overridden by a definition. 401 402 if (FD->hasAttr<DLLImportAttr>()) { 403 F->setLinkage(llvm::Function::DLLImportLinkage); 404 } else if (FD->hasAttr<WeakAttr>() || 405 FD->hasAttr<WeakImportAttr>()) { 406 // "extern_weak" is overloaded in LLVM; we probably should have 407 // separate linkage types for this. 408 F->setLinkage(llvm::Function::ExternalWeakLinkage); 409 } else { 410 F->setLinkage(llvm::Function::ExternalLinkage); 411 } 412 413 if (const SectionAttr *SA = FD->getAttr<SectionAttr>()) 414 F->setSection(SA->getName()); 415} 416 417void CodeGenModule::AddUsedGlobal(llvm::GlobalValue *GV) { 418 assert(!GV->isDeclaration() && 419 "Only globals with definition can force usage."); 420 LLVMUsed.push_back(GV); 421} 422 423void CodeGenModule::EmitLLVMUsed() { 424 // Don't create llvm.used if there is no need. 425 if (LLVMUsed.empty()) 426 return; 427 428 const llvm::Type *i8PTy = llvm::Type::getInt8PtrTy(VMContext); 429 430 // Convert LLVMUsed to what ConstantArray needs. 431 std::vector<llvm::Constant*> UsedArray; 432 UsedArray.resize(LLVMUsed.size()); 433 for (unsigned i = 0, e = LLVMUsed.size(); i != e; ++i) { 434 UsedArray[i] = 435 llvm::ConstantExpr::getBitCast(cast<llvm::Constant>(&*LLVMUsed[i]), 436 i8PTy); 437 } 438 439 if (UsedArray.empty()) 440 return; 441 llvm::ArrayType *ATy = llvm::ArrayType::get(i8PTy, UsedArray.size()); 442 443 llvm::GlobalVariable *GV = 444 new llvm::GlobalVariable(getModule(), ATy, false, 445 llvm::GlobalValue::AppendingLinkage, 446 llvm::ConstantArray::get(ATy, UsedArray), 447 "llvm.used"); 448 449 GV->setSection("llvm.metadata"); 450} 451 452void CodeGenModule::EmitDeferred() { 453 // Emit code for any potentially referenced deferred decls. Since a 454 // previously unused static decl may become used during the generation of code 455 // for a static function, iterate until no changes are made. 456 while (!DeferredDeclsToEmit.empty()) { 457 GlobalDecl D = DeferredDeclsToEmit.back(); 458 DeferredDeclsToEmit.pop_back(); 459 460 // The mangled name for the decl must have been emitted in GlobalDeclMap. 461 // Look it up to see if it was defined with a stronger definition (e.g. an 462 // extern inline function with a strong function redefinition). If so, 463 // just ignore the deferred decl. 464 llvm::GlobalValue *CGRef = GlobalDeclMap[getMangledName(D)]; 465 assert(CGRef && "Deferred decl wasn't referenced?"); 466 467 if (!CGRef->isDeclaration()) 468 continue; 469 470 // Otherwise, emit the definition and move on to the next one. 471 EmitGlobalDefinition(D); 472 } 473} 474 475/// EmitAnnotateAttr - Generate the llvm::ConstantStruct which contains the 476/// annotation information for a given GlobalValue. The annotation struct is 477/// {i8 *, i8 *, i8 *, i32}. The first field is a constant expression, the 478/// GlobalValue being annotated. The second field is the constant string 479/// created from the AnnotateAttr's annotation. The third field is a constant 480/// string containing the name of the translation unit. The fourth field is 481/// the line number in the file of the annotated value declaration. 482/// 483/// FIXME: this does not unique the annotation string constants, as llvm-gcc 484/// appears to. 485/// 486llvm::Constant *CodeGenModule::EmitAnnotateAttr(llvm::GlobalValue *GV, 487 const AnnotateAttr *AA, 488 unsigned LineNo) { 489 llvm::Module *M = &getModule(); 490 491 // get [N x i8] constants for the annotation string, and the filename string 492 // which are the 2nd and 3rd elements of the global annotation structure. 493 const llvm::Type *SBP = llvm::Type::getInt8PtrTy(VMContext); 494 llvm::Constant *anno = llvm::ConstantArray::get(VMContext, 495 AA->getAnnotation(), true); 496 llvm::Constant *unit = llvm::ConstantArray::get(VMContext, 497 M->getModuleIdentifier(), 498 true); 499 500 // Get the two global values corresponding to the ConstantArrays we just 501 // created to hold the bytes of the strings. 502 llvm::GlobalValue *annoGV = 503 new llvm::GlobalVariable(*M, anno->getType(), false, 504 llvm::GlobalValue::PrivateLinkage, anno, 505 GV->getName()); 506 // translation unit name string, emitted into the llvm.metadata section. 507 llvm::GlobalValue *unitGV = 508 new llvm::GlobalVariable(*M, unit->getType(), false, 509 llvm::GlobalValue::PrivateLinkage, unit, 510 ".str"); 511 512 // Create the ConstantStruct for the global annotation. 513 llvm::Constant *Fields[4] = { 514 llvm::ConstantExpr::getBitCast(GV, SBP), 515 llvm::ConstantExpr::getBitCast(annoGV, SBP), 516 llvm::ConstantExpr::getBitCast(unitGV, SBP), 517 llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), LineNo) 518 }; 519 return llvm::ConstantStruct::get(VMContext, Fields, 4, false); 520} 521 522bool CodeGenModule::MayDeferGeneration(const ValueDecl *Global) { 523 // Never defer when EmitAllDecls is specified or the decl has 524 // attribute used. 525 if (Features.EmitAllDecls || Global->hasAttr<UsedAttr>()) 526 return false; 527 528 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Global)) { 529 // Constructors and destructors should never be deferred. 530 if (FD->hasAttr<ConstructorAttr>() || 531 FD->hasAttr<DestructorAttr>()) 532 return false; 533 534 // The key function for a class must never be deferred. 535 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Global)) { 536 const CXXRecordDecl *RD = MD->getParent(); 537 if (MD->isOutOfLine() && RD->isDynamicClass()) { 538 const CXXMethodDecl *KeyFunction = getContext().getKeyFunction(RD); 539 if (KeyFunction == MD->getCanonicalDecl()) 540 return false; 541 } 542 } 543 544 GVALinkage Linkage = GetLinkageForFunction(getContext(), FD, Features); 545 546 // static, static inline, always_inline, and extern inline functions can 547 // always be deferred. Normal inline functions can be deferred in C99/C++. 548 if (Linkage == GVA_Internal || Linkage == GVA_C99Inline || 549 Linkage == GVA_CXXInline) 550 return true; 551 return false; 552 } 553 554 const VarDecl *VD = cast<VarDecl>(Global); 555 assert(VD->isFileVarDecl() && "Invalid decl"); 556 557 // We never want to defer structs that have non-trivial constructors or 558 // destructors. 559 560 // FIXME: Handle references. 561 if (const RecordType *RT = VD->getType()->getAs<RecordType>()) { 562 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl())) { 563 if (!RD->hasTrivialConstructor() || !RD->hasTrivialDestructor()) 564 return false; 565 } 566 } 567 568 // Static data may be deferred, but out-of-line static data members 569 // cannot be. 570 if (VD->isInAnonymousNamespace()) 571 return true; 572 if (VD->getLinkage() == VarDecl::InternalLinkage) { 573 // Initializer has side effects? 574 if (VD->getInit() && VD->getInit()->HasSideEffects(Context)) 575 return false; 576 return !(VD->isStaticDataMember() && VD->isOutOfLine()); 577 } 578 return false; 579} 580 581void CodeGenModule::EmitGlobal(GlobalDecl GD) { 582 const ValueDecl *Global = cast<ValueDecl>(GD.getDecl()); 583 584 // If this is an alias definition (which otherwise looks like a declaration) 585 // emit it now. 586 if (Global->hasAttr<AliasAttr>()) 587 return EmitAliasDefinition(Global); 588 589 // Ignore declarations, they will be emitted on their first use. 590 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Global)) { 591 // Forward declarations are emitted lazily on first use. 592 if (!FD->isThisDeclarationADefinition()) 593 return; 594 } else { 595 const VarDecl *VD = cast<VarDecl>(Global); 596 assert(VD->isFileVarDecl() && "Cannot emit local var decl as global."); 597 598 if (getLangOptions().CPlusPlus && !VD->getInit()) { 599 // In C++, if this is marked "extern", defer code generation. 600 if (VD->getStorageClass() == VarDecl::Extern || VD->isExternC()) 601 return; 602 603 // If this is a declaration of an explicit specialization of a static 604 // data member in a class template, don't emit it. 605 if (VD->isStaticDataMember() && 606 VD->getTemplateSpecializationKind() == TSK_ExplicitSpecialization) 607 return; 608 } 609 610 // In C, if this isn't a definition, defer code generation. 611 if (!getLangOptions().CPlusPlus && !VD->getInit()) 612 return; 613 } 614 615 // Defer code generation when possible if this is a static definition, inline 616 // function etc. These we only want to emit if they are used. 617 if (MayDeferGeneration(Global)) { 618 // If the value has already been used, add it directly to the 619 // DeferredDeclsToEmit list. 620 const char *MangledName = getMangledName(GD); 621 if (GlobalDeclMap.count(MangledName)) 622 DeferredDeclsToEmit.push_back(GD); 623 else { 624 // Otherwise, remember that we saw a deferred decl with this name. The 625 // first use of the mangled name will cause it to move into 626 // DeferredDeclsToEmit. 627 DeferredDecls[MangledName] = GD; 628 } 629 return; 630 } 631 632 // Otherwise emit the definition. 633 EmitGlobalDefinition(GD); 634} 635 636void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD) { 637 const ValueDecl *D = cast<ValueDecl>(GD.getDecl()); 638 639 PrettyStackTraceDecl CrashInfo((ValueDecl *)D, D->getLocation(), 640 Context.getSourceManager(), 641 "Generating code for declaration"); 642 643 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 644 getVtableInfo().MaybeEmitVtable(GD); 645 if (MD->isVirtual() && MD->isOutOfLine() && 646 (!isa<CXXDestructorDecl>(D) || GD.getDtorType() != Dtor_Base)) { 647 if (isa<CXXDestructorDecl>(D)) { 648 GlobalDecl CanonGD(cast<CXXDestructorDecl>(D->getCanonicalDecl()), 649 GD.getDtorType()); 650 BuildThunksForVirtual(CanonGD); 651 } else { 652 BuildThunksForVirtual(MD->getCanonicalDecl()); 653 } 654 } 655 } 656 657 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 658 EmitCXXConstructor(CD, GD.getCtorType()); 659 else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(D)) 660 EmitCXXDestructor(DD, GD.getDtorType()); 661 else if (isa<FunctionDecl>(D)) 662 EmitGlobalFunctionDefinition(GD); 663 else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 664 EmitGlobalVarDefinition(VD); 665 else { 666 assert(0 && "Invalid argument to EmitGlobalDefinition()"); 667 } 668} 669 670/// GetOrCreateLLVMFunction - If the specified mangled name is not in the 671/// module, create and return an llvm Function with the specified type. If there 672/// is something in the module with the specified name, return it potentially 673/// bitcasted to the right type. 674/// 675/// If D is non-null, it specifies a decl that correspond to this. This is used 676/// to set the attributes on the function when it is first created. 677llvm::Constant *CodeGenModule::GetOrCreateLLVMFunction(const char *MangledName, 678 const llvm::Type *Ty, 679 GlobalDecl D) { 680 // Lookup the entry, lazily creating it if necessary. 681 llvm::GlobalValue *&Entry = GlobalDeclMap[MangledName]; 682 if (Entry) { 683 if (Entry->getType()->getElementType() == Ty) 684 return Entry; 685 686 // Make sure the result is of the correct type. 687 const llvm::Type *PTy = llvm::PointerType::getUnqual(Ty); 688 return llvm::ConstantExpr::getBitCast(Entry, PTy); 689 } 690 691 // This function doesn't have a complete type (for example, the return 692 // type is an incomplete struct). Use a fake type instead, and make 693 // sure not to try to set attributes. 694 bool IsIncompleteFunction = false; 695 if (!isa<llvm::FunctionType>(Ty)) { 696 Ty = llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), 697 std::vector<const llvm::Type*>(), false); 698 IsIncompleteFunction = true; 699 } 700 llvm::Function *F = llvm::Function::Create(cast<llvm::FunctionType>(Ty), 701 llvm::Function::ExternalLinkage, 702 "", &getModule()); 703 F->setName(MangledName); 704 if (D.getDecl()) 705 SetFunctionAttributes(cast<FunctionDecl>(D.getDecl()), F, 706 IsIncompleteFunction); 707 Entry = F; 708 709 // This is the first use or definition of a mangled name. If there is a 710 // deferred decl with this name, remember that we need to emit it at the end 711 // of the file. 712 llvm::DenseMap<const char*, GlobalDecl>::iterator DDI = 713 DeferredDecls.find(MangledName); 714 if (DDI != DeferredDecls.end()) { 715 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit 716 // list, and remove it from DeferredDecls (since we don't need it anymore). 717 DeferredDeclsToEmit.push_back(DDI->second); 718 DeferredDecls.erase(DDI); 719 } else if (const FunctionDecl *FD = cast_or_null<FunctionDecl>(D.getDecl())) { 720 // If this the first reference to a C++ inline function in a class, queue up 721 // the deferred function body for emission. These are not seen as 722 // top-level declarations. 723 if (FD->isThisDeclarationADefinition() && MayDeferGeneration(FD)) 724 DeferredDeclsToEmit.push_back(D); 725 // A called constructor which has no definition or declaration need be 726 // synthesized. 727 else if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) { 728 if (CD->isImplicit()) 729 DeferredDeclsToEmit.push_back(D); 730 } else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(FD)) { 731 if (DD->isImplicit()) 732 DeferredDeclsToEmit.push_back(D); 733 } else if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 734 if (MD->isCopyAssignment() && MD->isImplicit()) 735 DeferredDeclsToEmit.push_back(D); 736 } 737 } 738 739 return F; 740} 741 742/// GetAddrOfFunction - Return the address of the given function. If Ty is 743/// non-null, then this function will use the specified type if it has to 744/// create it (this occurs when we see a definition of the function). 745llvm::Constant *CodeGenModule::GetAddrOfFunction(GlobalDecl GD, 746 const llvm::Type *Ty) { 747 // If there was no specific requested type, just convert it now. 748 if (!Ty) 749 Ty = getTypes().ConvertType(cast<ValueDecl>(GD.getDecl())->getType()); 750 return GetOrCreateLLVMFunction(getMangledName(GD), Ty, GD); 751} 752 753/// CreateRuntimeFunction - Create a new runtime function with the specified 754/// type and name. 755llvm::Constant * 756CodeGenModule::CreateRuntimeFunction(const llvm::FunctionType *FTy, 757 const char *Name) { 758 // Convert Name to be a uniqued string from the IdentifierInfo table. 759 Name = getContext().Idents.get(Name).getNameStart(); 760 return GetOrCreateLLVMFunction(Name, FTy, GlobalDecl()); 761} 762 763static bool DeclIsConstantGlobal(ASTContext &Context, const VarDecl *D) { 764 if (!D->getType().isConstant(Context)) 765 return false; 766 if (Context.getLangOptions().CPlusPlus && 767 Context.getBaseElementType(D->getType())->getAs<RecordType>()) { 768 // FIXME: We should do something fancier here! 769 return false; 770 } 771 return true; 772} 773 774/// GetOrCreateLLVMGlobal - If the specified mangled name is not in the module, 775/// create and return an llvm GlobalVariable with the specified type. If there 776/// is something in the module with the specified name, return it potentially 777/// bitcasted to the right type. 778/// 779/// If D is non-null, it specifies a decl that correspond to this. This is used 780/// to set the attributes on the global when it is first created. 781llvm::Constant *CodeGenModule::GetOrCreateLLVMGlobal(const char *MangledName, 782 const llvm::PointerType*Ty, 783 const VarDecl *D) { 784 // Lookup the entry, lazily creating it if necessary. 785 llvm::GlobalValue *&Entry = GlobalDeclMap[MangledName]; 786 if (Entry) { 787 if (Entry->getType() == Ty) 788 return Entry; 789 790 // Make sure the result is of the correct type. 791 return llvm::ConstantExpr::getBitCast(Entry, Ty); 792 } 793 794 // This is the first use or definition of a mangled name. If there is a 795 // deferred decl with this name, remember that we need to emit it at the end 796 // of the file. 797 llvm::DenseMap<const char*, GlobalDecl>::iterator DDI = 798 DeferredDecls.find(MangledName); 799 if (DDI != DeferredDecls.end()) { 800 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit 801 // list, and remove it from DeferredDecls (since we don't need it anymore). 802 DeferredDeclsToEmit.push_back(DDI->second); 803 DeferredDecls.erase(DDI); 804 } 805 806 llvm::GlobalVariable *GV = 807 new llvm::GlobalVariable(getModule(), Ty->getElementType(), false, 808 llvm::GlobalValue::ExternalLinkage, 809 0, "", 0, 810 false, Ty->getAddressSpace()); 811 GV->setName(MangledName); 812 813 // Handle things which are present even on external declarations. 814 if (D) { 815 // FIXME: This code is overly simple and should be merged with other global 816 // handling. 817 GV->setConstant(DeclIsConstantGlobal(Context, D)); 818 819 // FIXME: Merge with other attribute handling code. 820 if (D->getStorageClass() == VarDecl::PrivateExtern) 821 GV->setVisibility(llvm::GlobalValue::HiddenVisibility); 822 823 if (D->hasAttr<WeakAttr>() || 824 D->hasAttr<WeakImportAttr>()) 825 GV->setLinkage(llvm::GlobalValue::ExternalWeakLinkage); 826 827 GV->setThreadLocal(D->isThreadSpecified()); 828 } 829 830 return Entry = GV; 831} 832 833 834/// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the 835/// given global variable. If Ty is non-null and if the global doesn't exist, 836/// then it will be greated with the specified type instead of whatever the 837/// normal requested type would be. 838llvm::Constant *CodeGenModule::GetAddrOfGlobalVar(const VarDecl *D, 839 const llvm::Type *Ty) { 840 assert(D->hasGlobalStorage() && "Not a global variable"); 841 QualType ASTTy = D->getType(); 842 if (Ty == 0) 843 Ty = getTypes().ConvertTypeForMem(ASTTy); 844 845 const llvm::PointerType *PTy = 846 llvm::PointerType::get(Ty, ASTTy.getAddressSpace()); 847 return GetOrCreateLLVMGlobal(getMangledName(D), PTy, D); 848} 849 850/// CreateRuntimeVariable - Create a new runtime global variable with the 851/// specified type and name. 852llvm::Constant * 853CodeGenModule::CreateRuntimeVariable(const llvm::Type *Ty, 854 const char *Name) { 855 // Convert Name to be a uniqued string from the IdentifierInfo table. 856 Name = getContext().Idents.get(Name).getNameStart(); 857 return GetOrCreateLLVMGlobal(Name, llvm::PointerType::getUnqual(Ty), 0); 858} 859 860void CodeGenModule::EmitTentativeDefinition(const VarDecl *D) { 861 assert(!D->getInit() && "Cannot emit definite definitions here!"); 862 863 if (MayDeferGeneration(D)) { 864 // If we have not seen a reference to this variable yet, place it 865 // into the deferred declarations table to be emitted if needed 866 // later. 867 const char *MangledName = getMangledName(D); 868 if (GlobalDeclMap.count(MangledName) == 0) { 869 DeferredDecls[MangledName] = D; 870 return; 871 } 872 } 873 874 // The tentative definition is the only definition. 875 EmitGlobalVarDefinition(D); 876} 877 878static CodeGenModule::GVALinkage 879GetLinkageForVariable(ASTContext &Context, const VarDecl *VD) { 880 // Everything located semantically within an anonymous namespace is 881 // always internal. 882 if (VD->isInAnonymousNamespace()) 883 return CodeGenModule::GVA_Internal; 884 885 // Handle linkage for static data members. 886 if (VD->isStaticDataMember()) { 887 switch (VD->getTemplateSpecializationKind()) { 888 case TSK_Undeclared: 889 case TSK_ExplicitSpecialization: 890 case TSK_ExplicitInstantiationDefinition: 891 return CodeGenModule::GVA_StrongExternal; 892 893 case TSK_ExplicitInstantiationDeclaration: 894 llvm_unreachable("Variable should not be instantiated"); 895 // Fall through to treat this like any other instantiation. 896 897 case TSK_ImplicitInstantiation: 898 return CodeGenModule::GVA_TemplateInstantiation; 899 } 900 } 901 902 if (VD->getLinkage() == VarDecl::InternalLinkage) 903 return CodeGenModule::GVA_Internal; 904 905 return CodeGenModule::GVA_StrongExternal; 906} 907 908void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D) { 909 llvm::Constant *Init = 0; 910 QualType ASTTy = D->getType(); 911 912 if (D->getInit() == 0) { 913 // This is a tentative definition; tentative definitions are 914 // implicitly initialized with { 0 }. 915 // 916 // Note that tentative definitions are only emitted at the end of 917 // a translation unit, so they should never have incomplete 918 // type. In addition, EmitTentativeDefinition makes sure that we 919 // never attempt to emit a tentative definition if a real one 920 // exists. A use may still exists, however, so we still may need 921 // to do a RAUW. 922 assert(!ASTTy->isIncompleteType() && "Unexpected incomplete type"); 923 Init = EmitNullConstant(D->getType()); 924 } else { 925 Init = EmitConstantExpr(D->getInit(), D->getType()); 926 927 if (!Init) { 928 QualType T = D->getInit()->getType(); 929 if (getLangOptions().CPlusPlus) { 930 CXXGlobalInits.push_back(D); 931 Init = EmitNullConstant(T); 932 } else { 933 ErrorUnsupported(D, "static initializer"); 934 Init = llvm::UndefValue::get(getTypes().ConvertType(T)); 935 } 936 } 937 } 938 939 const llvm::Type* InitType = Init->getType(); 940 llvm::Constant *Entry = GetAddrOfGlobalVar(D, InitType); 941 942 // Strip off a bitcast if we got one back. 943 if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) { 944 assert(CE->getOpcode() == llvm::Instruction::BitCast || 945 // all zero index gep. 946 CE->getOpcode() == llvm::Instruction::GetElementPtr); 947 Entry = CE->getOperand(0); 948 } 949 950 // Entry is now either a Function or GlobalVariable. 951 llvm::GlobalVariable *GV = dyn_cast<llvm::GlobalVariable>(Entry); 952 953 // We have a definition after a declaration with the wrong type. 954 // We must make a new GlobalVariable* and update everything that used OldGV 955 // (a declaration or tentative definition) with the new GlobalVariable* 956 // (which will be a definition). 957 // 958 // This happens if there is a prototype for a global (e.g. 959 // "extern int x[];") and then a definition of a different type (e.g. 960 // "int x[10];"). This also happens when an initializer has a different type 961 // from the type of the global (this happens with unions). 962 if (GV == 0 || 963 GV->getType()->getElementType() != InitType || 964 GV->getType()->getAddressSpace() != ASTTy.getAddressSpace()) { 965 966 // Remove the old entry from GlobalDeclMap so that we'll create a new one. 967 GlobalDeclMap.erase(getMangledName(D)); 968 969 // Make a new global with the correct type, this is now guaranteed to work. 970 GV = cast<llvm::GlobalVariable>(GetAddrOfGlobalVar(D, InitType)); 971 GV->takeName(cast<llvm::GlobalValue>(Entry)); 972 973 // Replace all uses of the old global with the new global 974 llvm::Constant *NewPtrForOldDecl = 975 llvm::ConstantExpr::getBitCast(GV, Entry->getType()); 976 Entry->replaceAllUsesWith(NewPtrForOldDecl); 977 978 // Erase the old global, since it is no longer used. 979 cast<llvm::GlobalValue>(Entry)->eraseFromParent(); 980 } 981 982 if (const AnnotateAttr *AA = D->getAttr<AnnotateAttr>()) { 983 SourceManager &SM = Context.getSourceManager(); 984 AddAnnotation(EmitAnnotateAttr(GV, AA, 985 SM.getInstantiationLineNumber(D->getLocation()))); 986 } 987 988 GV->setInitializer(Init); 989 990 // If it is safe to mark the global 'constant', do so now. 991 GV->setConstant(false); 992 if (DeclIsConstantGlobal(Context, D)) 993 GV->setConstant(true); 994 995 GV->setAlignment(getContext().getDeclAlignInBytes(D)); 996 997 // Set the llvm linkage type as appropriate. 998 GVALinkage Linkage = GetLinkageForVariable(getContext(), D); 999 if (Linkage == GVA_Internal) 1000 GV->setLinkage(llvm::Function::InternalLinkage); 1001 else if (D->hasAttr<DLLImportAttr>()) 1002 GV->setLinkage(llvm::Function::DLLImportLinkage); 1003 else if (D->hasAttr<DLLExportAttr>()) 1004 GV->setLinkage(llvm::Function::DLLExportLinkage); 1005 else if (D->hasAttr<WeakAttr>()) { 1006 if (GV->isConstant()) 1007 GV->setLinkage(llvm::GlobalVariable::WeakODRLinkage); 1008 else 1009 GV->setLinkage(llvm::GlobalVariable::WeakAnyLinkage); 1010 } else if (Linkage == GVA_TemplateInstantiation) 1011 GV->setLinkage(llvm::GlobalVariable::WeakAnyLinkage); 1012 else if (!getLangOptions().CPlusPlus && !CodeGenOpts.NoCommon && 1013 !D->hasExternalStorage() && !D->getInit() && 1014 !D->getAttr<SectionAttr>()) { 1015 GV->setLinkage(llvm::GlobalVariable::CommonLinkage); 1016 // common vars aren't constant even if declared const. 1017 GV->setConstant(false); 1018 } else 1019 GV->setLinkage(llvm::GlobalVariable::ExternalLinkage); 1020 1021 SetCommonAttributes(D, GV); 1022 1023 // Emit global variable debug information. 1024 if (CGDebugInfo *DI = getDebugInfo()) { 1025 DI->setLocation(D->getLocation()); 1026 DI->EmitGlobalVariable(GV, D); 1027 } 1028} 1029 1030/// ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we 1031/// implement a function with no prototype, e.g. "int foo() {}". If there are 1032/// existing call uses of the old function in the module, this adjusts them to 1033/// call the new function directly. 1034/// 1035/// This is not just a cleanup: the always_inline pass requires direct calls to 1036/// functions to be able to inline them. If there is a bitcast in the way, it 1037/// won't inline them. Instcombine normally deletes these calls, but it isn't 1038/// run at -O0. 1039static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old, 1040 llvm::Function *NewFn) { 1041 // If we're redefining a global as a function, don't transform it. 1042 llvm::Function *OldFn = dyn_cast<llvm::Function>(Old); 1043 if (OldFn == 0) return; 1044 1045 const llvm::Type *NewRetTy = NewFn->getReturnType(); 1046 llvm::SmallVector<llvm::Value*, 4> ArgList; 1047 1048 for (llvm::Value::use_iterator UI = OldFn->use_begin(), E = OldFn->use_end(); 1049 UI != E; ) { 1050 // TODO: Do invokes ever occur in C code? If so, we should handle them too. 1051 unsigned OpNo = UI.getOperandNo(); 1052 llvm::CallInst *CI = dyn_cast<llvm::CallInst>(*UI++); 1053 if (!CI || OpNo != 0) continue; 1054 1055 // If the return types don't match exactly, and if the call isn't dead, then 1056 // we can't transform this call. 1057 if (CI->getType() != NewRetTy && !CI->use_empty()) 1058 continue; 1059 1060 // If the function was passed too few arguments, don't transform. If extra 1061 // arguments were passed, we silently drop them. If any of the types 1062 // mismatch, we don't transform. 1063 unsigned ArgNo = 0; 1064 bool DontTransform = false; 1065 for (llvm::Function::arg_iterator AI = NewFn->arg_begin(), 1066 E = NewFn->arg_end(); AI != E; ++AI, ++ArgNo) { 1067 if (CI->getNumOperands()-1 == ArgNo || 1068 CI->getOperand(ArgNo+1)->getType() != AI->getType()) { 1069 DontTransform = true; 1070 break; 1071 } 1072 } 1073 if (DontTransform) 1074 continue; 1075 1076 // Okay, we can transform this. Create the new call instruction and copy 1077 // over the required information. 1078 ArgList.append(CI->op_begin()+1, CI->op_begin()+1+ArgNo); 1079 llvm::CallInst *NewCall = llvm::CallInst::Create(NewFn, ArgList.begin(), 1080 ArgList.end(), "", CI); 1081 ArgList.clear(); 1082 if (!NewCall->getType()->isVoidTy()) 1083 NewCall->takeName(CI); 1084 NewCall->setAttributes(CI->getAttributes()); 1085 NewCall->setCallingConv(CI->getCallingConv()); 1086 1087 // Finally, remove the old call, replacing any uses with the new one. 1088 if (!CI->use_empty()) 1089 CI->replaceAllUsesWith(NewCall); 1090 1091 // Copy any custom metadata attached with CI. 1092 llvm::MetadataContext &TheMetadata = CI->getContext().getMetadata(); 1093 TheMetadata.copyMD(CI, NewCall); 1094 1095 CI->eraseFromParent(); 1096 } 1097} 1098 1099 1100void CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD) { 1101 const llvm::FunctionType *Ty; 1102 const FunctionDecl *D = cast<FunctionDecl>(GD.getDecl()); 1103 1104 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 1105 bool isVariadic = D->getType()->getAs<FunctionProtoType>()->isVariadic(); 1106 1107 Ty = getTypes().GetFunctionType(getTypes().getFunctionInfo(MD), isVariadic); 1108 } else { 1109 Ty = cast<llvm::FunctionType>(getTypes().ConvertType(D->getType())); 1110 1111 // As a special case, make sure that definitions of K&R function 1112 // "type foo()" aren't declared as varargs (which forces the backend 1113 // to do unnecessary work). 1114 if (D->getType()->isFunctionNoProtoType()) { 1115 assert(Ty->isVarArg() && "Didn't lower type as expected"); 1116 // Due to stret, the lowered function could have arguments. 1117 // Just create the same type as was lowered by ConvertType 1118 // but strip off the varargs bit. 1119 std::vector<const llvm::Type*> Args(Ty->param_begin(), Ty->param_end()); 1120 Ty = llvm::FunctionType::get(Ty->getReturnType(), Args, false); 1121 } 1122 } 1123 1124 // Get or create the prototype for the function. 1125 llvm::Constant *Entry = GetAddrOfFunction(GD, Ty); 1126 1127 // Strip off a bitcast if we got one back. 1128 if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) { 1129 assert(CE->getOpcode() == llvm::Instruction::BitCast); 1130 Entry = CE->getOperand(0); 1131 } 1132 1133 1134 if (cast<llvm::GlobalValue>(Entry)->getType()->getElementType() != Ty) { 1135 llvm::GlobalValue *OldFn = cast<llvm::GlobalValue>(Entry); 1136 1137 // If the types mismatch then we have to rewrite the definition. 1138 assert(OldFn->isDeclaration() && 1139 "Shouldn't replace non-declaration"); 1140 1141 // F is the Function* for the one with the wrong type, we must make a new 1142 // Function* and update everything that used F (a declaration) with the new 1143 // Function* (which will be a definition). 1144 // 1145 // This happens if there is a prototype for a function 1146 // (e.g. "int f()") and then a definition of a different type 1147 // (e.g. "int f(int x)"). Start by making a new function of the 1148 // correct type, RAUW, then steal the name. 1149 GlobalDeclMap.erase(getMangledName(D)); 1150 llvm::Function *NewFn = cast<llvm::Function>(GetAddrOfFunction(GD, Ty)); 1151 NewFn->takeName(OldFn); 1152 1153 // If this is an implementation of a function without a prototype, try to 1154 // replace any existing uses of the function (which may be calls) with uses 1155 // of the new function 1156 if (D->getType()->isFunctionNoProtoType()) { 1157 ReplaceUsesOfNonProtoTypeWithRealFunction(OldFn, NewFn); 1158 OldFn->removeDeadConstantUsers(); 1159 } 1160 1161 // Replace uses of F with the Function we will endow with a body. 1162 if (!Entry->use_empty()) { 1163 llvm::Constant *NewPtrForOldDecl = 1164 llvm::ConstantExpr::getBitCast(NewFn, Entry->getType()); 1165 Entry->replaceAllUsesWith(NewPtrForOldDecl); 1166 } 1167 1168 // Ok, delete the old function now, which is dead. 1169 OldFn->eraseFromParent(); 1170 1171 Entry = NewFn; 1172 } 1173 1174 llvm::Function *Fn = cast<llvm::Function>(Entry); 1175 1176 CodeGenFunction(*this).GenerateCode(D, Fn); 1177 1178 SetFunctionDefinitionAttributes(D, Fn); 1179 SetLLVMFunctionAttributesForDefinition(D, Fn); 1180 1181 if (const ConstructorAttr *CA = D->getAttr<ConstructorAttr>()) 1182 AddGlobalCtor(Fn, CA->getPriority()); 1183 if (const DestructorAttr *DA = D->getAttr<DestructorAttr>()) 1184 AddGlobalDtor(Fn, DA->getPriority()); 1185} 1186 1187void CodeGenModule::EmitAliasDefinition(const ValueDecl *D) { 1188 const AliasAttr *AA = D->getAttr<AliasAttr>(); 1189 assert(AA && "Not an alias?"); 1190 1191 const llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType()); 1192 1193 // Unique the name through the identifier table. 1194 const char *AliaseeName = AA->getAliasee().c_str(); 1195 AliaseeName = getContext().Idents.get(AliaseeName).getNameStart(); 1196 1197 // Create a reference to the named value. This ensures that it is emitted 1198 // if a deferred decl. 1199 llvm::Constant *Aliasee; 1200 if (isa<llvm::FunctionType>(DeclTy)) 1201 Aliasee = GetOrCreateLLVMFunction(AliaseeName, DeclTy, GlobalDecl()); 1202 else 1203 Aliasee = GetOrCreateLLVMGlobal(AliaseeName, 1204 llvm::PointerType::getUnqual(DeclTy), 0); 1205 1206 // Create the new alias itself, but don't set a name yet. 1207 llvm::GlobalValue *GA = 1208 new llvm::GlobalAlias(Aliasee->getType(), 1209 llvm::Function::ExternalLinkage, 1210 "", Aliasee, &getModule()); 1211 1212 // See if there is already something with the alias' name in the module. 1213 const char *MangledName = getMangledName(D); 1214 llvm::GlobalValue *&Entry = GlobalDeclMap[MangledName]; 1215 1216 if (Entry && !Entry->isDeclaration()) { 1217 // If there is a definition in the module, then it wins over the alias. 1218 // This is dubious, but allow it to be safe. Just ignore the alias. 1219 GA->eraseFromParent(); 1220 return; 1221 } 1222 1223 if (Entry) { 1224 // If there is a declaration in the module, then we had an extern followed 1225 // by the alias, as in: 1226 // extern int test6(); 1227 // ... 1228 // int test6() __attribute__((alias("test7"))); 1229 // 1230 // Remove it and replace uses of it with the alias. 1231 1232 Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GA, 1233 Entry->getType())); 1234 Entry->eraseFromParent(); 1235 } 1236 1237 // Now we know that there is no conflict, set the name. 1238 Entry = GA; 1239 GA->setName(MangledName); 1240 1241 // Set attributes which are particular to an alias; this is a 1242 // specialization of the attributes which may be set on a global 1243 // variable/function. 1244 if (D->hasAttr<DLLExportAttr>()) { 1245 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1246 // The dllexport attribute is ignored for undefined symbols. 1247 if (FD->getBody()) 1248 GA->setLinkage(llvm::Function::DLLExportLinkage); 1249 } else { 1250 GA->setLinkage(llvm::Function::DLLExportLinkage); 1251 } 1252 } else if (D->hasAttr<WeakAttr>() || 1253 D->hasAttr<WeakImportAttr>()) { 1254 GA->setLinkage(llvm::Function::WeakAnyLinkage); 1255 } 1256 1257 SetCommonAttributes(D, GA); 1258} 1259 1260/// getBuiltinLibFunction - Given a builtin id for a function like 1261/// "__builtin_fabsf", return a Function* for "fabsf". 1262llvm::Value *CodeGenModule::getBuiltinLibFunction(const FunctionDecl *FD, 1263 unsigned BuiltinID) { 1264 assert((Context.BuiltinInfo.isLibFunction(BuiltinID) || 1265 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) && 1266 "isn't a lib fn"); 1267 1268 // Get the name, skip over the __builtin_ prefix (if necessary). 1269 const char *Name = Context.BuiltinInfo.GetName(BuiltinID); 1270 if (Context.BuiltinInfo.isLibFunction(BuiltinID)) 1271 Name += 10; 1272 1273 const llvm::FunctionType *Ty = 1274 cast<llvm::FunctionType>(getTypes().ConvertType(FD->getType())); 1275 1276 // Unique the name through the identifier table. 1277 Name = getContext().Idents.get(Name).getNameStart(); 1278 return GetOrCreateLLVMFunction(Name, Ty, GlobalDecl(FD)); 1279} 1280 1281llvm::Function *CodeGenModule::getIntrinsic(unsigned IID,const llvm::Type **Tys, 1282 unsigned NumTys) { 1283 return llvm::Intrinsic::getDeclaration(&getModule(), 1284 (llvm::Intrinsic::ID)IID, Tys, NumTys); 1285} 1286 1287llvm::Function *CodeGenModule::getMemCpyFn() { 1288 if (MemCpyFn) return MemCpyFn; 1289 const llvm::Type *IntPtr = TheTargetData.getIntPtrType(VMContext); 1290 return MemCpyFn = getIntrinsic(llvm::Intrinsic::memcpy, &IntPtr, 1); 1291} 1292 1293llvm::Function *CodeGenModule::getMemMoveFn() { 1294 if (MemMoveFn) return MemMoveFn; 1295 const llvm::Type *IntPtr = TheTargetData.getIntPtrType(VMContext); 1296 return MemMoveFn = getIntrinsic(llvm::Intrinsic::memmove, &IntPtr, 1); 1297} 1298 1299llvm::Function *CodeGenModule::getMemSetFn() { 1300 if (MemSetFn) return MemSetFn; 1301 const llvm::Type *IntPtr = TheTargetData.getIntPtrType(VMContext); 1302 return MemSetFn = getIntrinsic(llvm::Intrinsic::memset, &IntPtr, 1); 1303} 1304 1305static llvm::StringMapEntry<llvm::Constant*> & 1306GetConstantCFStringEntry(llvm::StringMap<llvm::Constant*> &Map, 1307 const StringLiteral *Literal, 1308 bool TargetIsLSB, 1309 bool &IsUTF16, 1310 unsigned &StringLength) { 1311 unsigned NumBytes = Literal->getByteLength(); 1312 1313 // Check for simple case. 1314 if (!Literal->containsNonAsciiOrNull()) { 1315 StringLength = NumBytes; 1316 return Map.GetOrCreateValue(llvm::StringRef(Literal->getStrData(), 1317 StringLength)); 1318 } 1319 1320 // Otherwise, convert the UTF8 literals into a byte string. 1321 llvm::SmallVector<UTF16, 128> ToBuf(NumBytes); 1322 const UTF8 *FromPtr = (UTF8 *)Literal->getStrData(); 1323 UTF16 *ToPtr = &ToBuf[0]; 1324 1325 ConversionResult Result = ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes, 1326 &ToPtr, ToPtr + NumBytes, 1327 strictConversion); 1328 1329 // Check for conversion failure. 1330 if (Result != conversionOK) { 1331 // FIXME: Have Sema::CheckObjCString() validate the UTF-8 string and remove 1332 // this duplicate code. 1333 assert(Result == sourceIllegal && "UTF-8 to UTF-16 conversion failed"); 1334 StringLength = NumBytes; 1335 return Map.GetOrCreateValue(llvm::StringRef(Literal->getStrData(), 1336 StringLength)); 1337 } 1338 1339 // ConvertUTF8toUTF16 returns the length in ToPtr. 1340 StringLength = ToPtr - &ToBuf[0]; 1341 1342 // Render the UTF-16 string into a byte array and convert to the target byte 1343 // order. 1344 // 1345 // FIXME: This isn't something we should need to do here. 1346 llvm::SmallString<128> AsBytes; 1347 AsBytes.reserve(StringLength * 2); 1348 for (unsigned i = 0; i != StringLength; ++i) { 1349 unsigned short Val = ToBuf[i]; 1350 if (TargetIsLSB) { 1351 AsBytes.push_back(Val & 0xFF); 1352 AsBytes.push_back(Val >> 8); 1353 } else { 1354 AsBytes.push_back(Val >> 8); 1355 AsBytes.push_back(Val & 0xFF); 1356 } 1357 } 1358 // Append one extra null character, the second is automatically added by our 1359 // caller. 1360 AsBytes.push_back(0); 1361 1362 IsUTF16 = true; 1363 return Map.GetOrCreateValue(llvm::StringRef(AsBytes.data(), AsBytes.size())); 1364} 1365 1366llvm::Constant * 1367CodeGenModule::GetAddrOfConstantCFString(const StringLiteral *Literal) { 1368 unsigned StringLength = 0; 1369 bool isUTF16 = false; 1370 llvm::StringMapEntry<llvm::Constant*> &Entry = 1371 GetConstantCFStringEntry(CFConstantStringMap, Literal, 1372 getTargetData().isLittleEndian(), 1373 isUTF16, StringLength); 1374 1375 if (llvm::Constant *C = Entry.getValue()) 1376 return C; 1377 1378 llvm::Constant *Zero = 1379 llvm::Constant::getNullValue(llvm::Type::getInt32Ty(VMContext)); 1380 llvm::Constant *Zeros[] = { Zero, Zero }; 1381 1382 // If we don't already have it, get __CFConstantStringClassReference. 1383 if (!CFConstantStringClassRef) { 1384 const llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy); 1385 Ty = llvm::ArrayType::get(Ty, 0); 1386 llvm::Constant *GV = CreateRuntimeVariable(Ty, 1387 "__CFConstantStringClassReference"); 1388 // Decay array -> ptr 1389 CFConstantStringClassRef = 1390 llvm::ConstantExpr::getGetElementPtr(GV, Zeros, 2); 1391 } 1392 1393 QualType CFTy = getContext().getCFConstantStringType(); 1394 1395 const llvm::StructType *STy = 1396 cast<llvm::StructType>(getTypes().ConvertType(CFTy)); 1397 1398 std::vector<llvm::Constant*> Fields(4); 1399 1400 // Class pointer. 1401 Fields[0] = CFConstantStringClassRef; 1402 1403 // Flags. 1404 const llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy); 1405 Fields[1] = isUTF16 ? llvm::ConstantInt::get(Ty, 0x07d0) : 1406 llvm::ConstantInt::get(Ty, 0x07C8); 1407 1408 // String pointer. 1409 llvm::Constant *C = llvm::ConstantArray::get(VMContext, Entry.getKey().str()); 1410 1411 const char *Sect = 0; 1412 llvm::GlobalValue::LinkageTypes Linkage; 1413 bool isConstant; 1414 if (isUTF16) { 1415 Sect = getContext().Target.getUnicodeStringSection(); 1416 // FIXME: why do utf strings get "_" labels instead of "L" labels? 1417 Linkage = llvm::GlobalValue::InternalLinkage; 1418 // Note: -fwritable-strings doesn't make unicode CFStrings writable, but 1419 // does make plain ascii ones writable. 1420 isConstant = true; 1421 } else { 1422 Linkage = llvm::GlobalValue::PrivateLinkage; 1423 isConstant = !Features.WritableStrings; 1424 } 1425 1426 llvm::GlobalVariable *GV = 1427 new llvm::GlobalVariable(getModule(), C->getType(), isConstant, Linkage, C, 1428 ".str"); 1429 if (Sect) 1430 GV->setSection(Sect); 1431 if (isUTF16) { 1432 unsigned Align = getContext().getTypeAlign(getContext().ShortTy)/8; 1433 GV->setAlignment(Align); 1434 } 1435 Fields[2] = llvm::ConstantExpr::getGetElementPtr(GV, Zeros, 2); 1436 1437 // String length. 1438 Ty = getTypes().ConvertType(getContext().LongTy); 1439 Fields[3] = llvm::ConstantInt::get(Ty, StringLength); 1440 1441 // The struct. 1442 C = llvm::ConstantStruct::get(STy, Fields); 1443 GV = new llvm::GlobalVariable(getModule(), C->getType(), true, 1444 llvm::GlobalVariable::PrivateLinkage, C, 1445 "_unnamed_cfstring_"); 1446 if (const char *Sect = getContext().Target.getCFStringSection()) 1447 GV->setSection(Sect); 1448 Entry.setValue(GV); 1449 1450 return GV; 1451} 1452 1453/// GetStringForStringLiteral - Return the appropriate bytes for a 1454/// string literal, properly padded to match the literal type. 1455std::string CodeGenModule::GetStringForStringLiteral(const StringLiteral *E) { 1456 const char *StrData = E->getStrData(); 1457 unsigned Len = E->getByteLength(); 1458 1459 const ConstantArrayType *CAT = 1460 getContext().getAsConstantArrayType(E->getType()); 1461 assert(CAT && "String isn't pointer or array!"); 1462 1463 // Resize the string to the right size. 1464 std::string Str(StrData, StrData+Len); 1465 uint64_t RealLen = CAT->getSize().getZExtValue(); 1466 1467 if (E->isWide()) 1468 RealLen *= getContext().Target.getWCharWidth()/8; 1469 1470 Str.resize(RealLen, '\0'); 1471 1472 return Str; 1473} 1474 1475/// GetAddrOfConstantStringFromLiteral - Return a pointer to a 1476/// constant array for the given string literal. 1477llvm::Constant * 1478CodeGenModule::GetAddrOfConstantStringFromLiteral(const StringLiteral *S) { 1479 // FIXME: This can be more efficient. 1480 // FIXME: We shouldn't need to bitcast the constant in the wide string case. 1481 llvm::Constant *C = GetAddrOfConstantString(GetStringForStringLiteral(S)); 1482 if (S->isWide()) { 1483 llvm::Type *DestTy = 1484 llvm::PointerType::getUnqual(getTypes().ConvertType(S->getType())); 1485 C = llvm::ConstantExpr::getBitCast(C, DestTy); 1486 } 1487 return C; 1488} 1489 1490/// GetAddrOfConstantStringFromObjCEncode - Return a pointer to a constant 1491/// array for the given ObjCEncodeExpr node. 1492llvm::Constant * 1493CodeGenModule::GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *E) { 1494 std::string Str; 1495 getContext().getObjCEncodingForType(E->getEncodedType(), Str); 1496 1497 return GetAddrOfConstantCString(Str); 1498} 1499 1500 1501/// GenerateWritableString -- Creates storage for a string literal. 1502static llvm::Constant *GenerateStringLiteral(const std::string &str, 1503 bool constant, 1504 CodeGenModule &CGM, 1505 const char *GlobalName) { 1506 // Create Constant for this string literal. Don't add a '\0'. 1507 llvm::Constant *C = 1508 llvm::ConstantArray::get(CGM.getLLVMContext(), str, false); 1509 1510 // Create a global variable for this string 1511 return new llvm::GlobalVariable(CGM.getModule(), C->getType(), constant, 1512 llvm::GlobalValue::PrivateLinkage, 1513 C, GlobalName); 1514} 1515 1516/// GetAddrOfConstantString - Returns a pointer to a character array 1517/// containing the literal. This contents are exactly that of the 1518/// given string, i.e. it will not be null terminated automatically; 1519/// see GetAddrOfConstantCString. Note that whether the result is 1520/// actually a pointer to an LLVM constant depends on 1521/// Feature.WriteableStrings. 1522/// 1523/// The result has pointer to array type. 1524llvm::Constant *CodeGenModule::GetAddrOfConstantString(const std::string &str, 1525 const char *GlobalName) { 1526 bool IsConstant = !Features.WritableStrings; 1527 1528 // Get the default prefix if a name wasn't specified. 1529 if (!GlobalName) 1530 GlobalName = ".str"; 1531 1532 // Don't share any string literals if strings aren't constant. 1533 if (!IsConstant) 1534 return GenerateStringLiteral(str, false, *this, GlobalName); 1535 1536 llvm::StringMapEntry<llvm::Constant *> &Entry = 1537 ConstantStringMap.GetOrCreateValue(&str[0], &str[str.length()]); 1538 1539 if (Entry.getValue()) 1540 return Entry.getValue(); 1541 1542 // Create a global variable for this. 1543 llvm::Constant *C = GenerateStringLiteral(str, true, *this, GlobalName); 1544 Entry.setValue(C); 1545 return C; 1546} 1547 1548/// GetAddrOfConstantCString - Returns a pointer to a character 1549/// array containing the literal and a terminating '\-' 1550/// character. The result has pointer to array type. 1551llvm::Constant *CodeGenModule::GetAddrOfConstantCString(const std::string &str, 1552 const char *GlobalName){ 1553 return GetAddrOfConstantString(str + '\0', GlobalName); 1554} 1555 1556/// EmitObjCPropertyImplementations - Emit information for synthesized 1557/// properties for an implementation. 1558void CodeGenModule::EmitObjCPropertyImplementations(const 1559 ObjCImplementationDecl *D) { 1560 for (ObjCImplementationDecl::propimpl_iterator 1561 i = D->propimpl_begin(), e = D->propimpl_end(); i != e; ++i) { 1562 ObjCPropertyImplDecl *PID = *i; 1563 1564 // Dynamic is just for type-checking. 1565 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) { 1566 ObjCPropertyDecl *PD = PID->getPropertyDecl(); 1567 1568 // Determine which methods need to be implemented, some may have 1569 // been overridden. Note that ::isSynthesized is not the method 1570 // we want, that just indicates if the decl came from a 1571 // property. What we want to know is if the method is defined in 1572 // this implementation. 1573 if (!D->getInstanceMethod(PD->getGetterName())) 1574 CodeGenFunction(*this).GenerateObjCGetter( 1575 const_cast<ObjCImplementationDecl *>(D), PID); 1576 if (!PD->isReadOnly() && 1577 !D->getInstanceMethod(PD->getSetterName())) 1578 CodeGenFunction(*this).GenerateObjCSetter( 1579 const_cast<ObjCImplementationDecl *>(D), PID); 1580 } 1581 } 1582} 1583 1584/// EmitNamespace - Emit all declarations in a namespace. 1585void CodeGenModule::EmitNamespace(const NamespaceDecl *ND) { 1586 for (RecordDecl::decl_iterator I = ND->decls_begin(), E = ND->decls_end(); 1587 I != E; ++I) 1588 EmitTopLevelDecl(*I); 1589} 1590 1591// EmitLinkageSpec - Emit all declarations in a linkage spec. 1592void CodeGenModule::EmitLinkageSpec(const LinkageSpecDecl *LSD) { 1593 if (LSD->getLanguage() != LinkageSpecDecl::lang_c && 1594 LSD->getLanguage() != LinkageSpecDecl::lang_cxx) { 1595 ErrorUnsupported(LSD, "linkage spec"); 1596 return; 1597 } 1598 1599 for (RecordDecl::decl_iterator I = LSD->decls_begin(), E = LSD->decls_end(); 1600 I != E; ++I) 1601 EmitTopLevelDecl(*I); 1602} 1603 1604/// EmitTopLevelDecl - Emit code for a single top level declaration. 1605void CodeGenModule::EmitTopLevelDecl(Decl *D) { 1606 // If an error has occurred, stop code generation, but continue 1607 // parsing and semantic analysis (to ensure all warnings and errors 1608 // are emitted). 1609 if (Diags.hasErrorOccurred()) 1610 return; 1611 1612 // Ignore dependent declarations. 1613 if (D->getDeclContext() && D->getDeclContext()->isDependentContext()) 1614 return; 1615 1616 switch (D->getKind()) { 1617 case Decl::CXXConversion: 1618 case Decl::CXXMethod: 1619 case Decl::Function: 1620 // Skip function templates 1621 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate()) 1622 return; 1623 1624 EmitGlobal(cast<FunctionDecl>(D)); 1625 break; 1626 1627 case Decl::Var: 1628 EmitGlobal(cast<VarDecl>(D)); 1629 break; 1630 1631 // C++ Decls 1632 case Decl::Namespace: 1633 EmitNamespace(cast<NamespaceDecl>(D)); 1634 break; 1635 // No code generation needed. 1636 case Decl::UsingShadow: 1637 case Decl::Using: 1638 case Decl::UsingDirective: 1639 case Decl::ClassTemplate: 1640 case Decl::FunctionTemplate: 1641 case Decl::NamespaceAlias: 1642 break; 1643 case Decl::CXXConstructor: 1644 // Skip function templates 1645 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate()) 1646 return; 1647 1648 EmitCXXConstructors(cast<CXXConstructorDecl>(D)); 1649 break; 1650 case Decl::CXXDestructor: 1651 EmitCXXDestructors(cast<CXXDestructorDecl>(D)); 1652 break; 1653 1654 case Decl::StaticAssert: 1655 // Nothing to do. 1656 break; 1657 1658 // Objective-C Decls 1659 1660 // Forward declarations, no (immediate) code generation. 1661 case Decl::ObjCClass: 1662 case Decl::ObjCForwardProtocol: 1663 case Decl::ObjCCategory: 1664 case Decl::ObjCInterface: 1665 break; 1666 1667 case Decl::ObjCProtocol: 1668 Runtime->GenerateProtocol(cast<ObjCProtocolDecl>(D)); 1669 break; 1670 1671 case Decl::ObjCCategoryImpl: 1672 // Categories have properties but don't support synthesize so we 1673 // can ignore them here. 1674 Runtime->GenerateCategory(cast<ObjCCategoryImplDecl>(D)); 1675 break; 1676 1677 case Decl::ObjCImplementation: { 1678 ObjCImplementationDecl *OMD = cast<ObjCImplementationDecl>(D); 1679 EmitObjCPropertyImplementations(OMD); 1680 Runtime->GenerateClass(OMD); 1681 break; 1682 } 1683 case Decl::ObjCMethod: { 1684 ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(D); 1685 // If this is not a prototype, emit the body. 1686 if (OMD->getBody()) 1687 CodeGenFunction(*this).GenerateObjCMethod(OMD); 1688 break; 1689 } 1690 case Decl::ObjCCompatibleAlias: 1691 // compatibility-alias is a directive and has no code gen. 1692 break; 1693 1694 case Decl::LinkageSpec: 1695 EmitLinkageSpec(cast<LinkageSpecDecl>(D)); 1696 break; 1697 1698 case Decl::FileScopeAsm: { 1699 FileScopeAsmDecl *AD = cast<FileScopeAsmDecl>(D); 1700 llvm::StringRef AsmString = AD->getAsmString()->getString(); 1701 1702 const std::string &S = getModule().getModuleInlineAsm(); 1703 if (S.empty()) 1704 getModule().setModuleInlineAsm(AsmString); 1705 else 1706 getModule().setModuleInlineAsm(S + '\n' + AsmString.str()); 1707 break; 1708 } 1709 1710 default: 1711 // Make sure we handled everything we should, every other kind is a 1712 // non-top-level decl. FIXME: Would be nice to have an isTopLevelDeclKind 1713 // function. Need to recode Decl::Kind to do that easily. 1714 assert(isa<TypeDecl>(D) && "Unsupported decl kind"); 1715 } 1716} 1717