CodeGenModule.cpp revision 8e51a1f5da6ef4a1a168d14116c6eed3a578a263
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 "TargetInfo.h" 21#include "clang/CodeGen/CodeGenOptions.h" 22#include "clang/AST/ASTContext.h" 23#include "clang/AST/CharUnits.h" 24#include "clang/AST/DeclObjC.h" 25#include "clang/AST/DeclCXX.h" 26#include "clang/AST/RecordLayout.h" 27#include "clang/Basic/Builtins.h" 28#include "clang/Basic/Diagnostic.h" 29#include "clang/Basic/SourceManager.h" 30#include "clang/Basic/TargetInfo.h" 31#include "clang/Basic/ConvertUTF.h" 32#include "llvm/CallingConv.h" 33#include "llvm/Module.h" 34#include "llvm/Intrinsics.h" 35#include "llvm/LLVMContext.h" 36#include "llvm/Target/TargetData.h" 37#include "llvm/Support/ErrorHandling.h" 38using namespace clang; 39using namespace CodeGen; 40 41 42CodeGenModule::CodeGenModule(ASTContext &C, const CodeGenOptions &CGO, 43 llvm::Module &M, const llvm::TargetData &TD, 44 Diagnostic &diags) 45 : BlockModule(C, M, TD, Types, *this), Context(C), 46 Features(C.getLangOptions()), CodeGenOpts(CGO), TheModule(M), 47 TheTargetData(TD), TheTargetCodeGenInfo(0), Diags(diags), 48 Types(C, M, TD, getTargetCodeGenInfo().getABIInfo()), 49 MangleCtx(C), VtableInfo(*this), Runtime(0), 50 MemCpyFn(0), MemMoveFn(0), MemSetFn(0), CFConstantStringClassRef(0), 51 VMContext(M.getContext()) { 52 53 if (!Features.ObjC1) 54 Runtime = 0; 55 else if (!Features.NeXTRuntime) 56 Runtime = CreateGNUObjCRuntime(*this); 57 else if (Features.ObjCNonFragileABI) 58 Runtime = CreateMacNonFragileABIObjCRuntime(*this); 59 else 60 Runtime = CreateMacObjCRuntime(*this); 61 62 // If debug info generation is enabled, create the CGDebugInfo object. 63 DebugInfo = CodeGenOpts.DebugInfo ? new CGDebugInfo(*this) : 0; 64} 65 66CodeGenModule::~CodeGenModule() { 67 delete Runtime; 68 delete DebugInfo; 69} 70 71void CodeGenModule::createObjCRuntime() { 72 if (!Features.NeXTRuntime) 73 Runtime = CreateGNUObjCRuntime(*this); 74 else if (Features.ObjCNonFragileABI) 75 Runtime = CreateMacNonFragileABIObjCRuntime(*this); 76 else 77 Runtime = CreateMacObjCRuntime(*this); 78} 79 80void CodeGenModule::Release() { 81 EmitDeferred(); 82 EmitCXXGlobalInitFunc(); 83 if (Runtime) 84 if (llvm::Function *ObjCInitFunction = Runtime->ModuleInitFunction()) 85 AddGlobalCtor(ObjCInitFunction); 86 EmitCtorList(GlobalCtors, "llvm.global_ctors"); 87 EmitCtorList(GlobalDtors, "llvm.global_dtors"); 88 EmitAnnotations(); 89 EmitLLVMUsed(); 90} 91 92/// ErrorUnsupported - Print out an error that codegen doesn't support the 93/// specified stmt yet. 94void CodeGenModule::ErrorUnsupported(const Stmt *S, const char *Type, 95 bool OmitOnError) { 96 if (OmitOnError && getDiags().hasErrorOccurred()) 97 return; 98 unsigned DiagID = getDiags().getCustomDiagID(Diagnostic::Error, 99 "cannot compile this %0 yet"); 100 std::string Msg = Type; 101 getDiags().Report(Context.getFullLoc(S->getLocStart()), DiagID) 102 << Msg << S->getSourceRange(); 103} 104 105/// ErrorUnsupported - Print out an error that codegen doesn't support the 106/// specified decl yet. 107void CodeGenModule::ErrorUnsupported(const Decl *D, const char *Type, 108 bool OmitOnError) { 109 if (OmitOnError && getDiags().hasErrorOccurred()) 110 return; 111 unsigned DiagID = getDiags().getCustomDiagID(Diagnostic::Error, 112 "cannot compile this %0 yet"); 113 std::string Msg = Type; 114 getDiags().Report(Context.getFullLoc(D->getLocation()), DiagID) << Msg; 115} 116 117LangOptions::VisibilityMode 118CodeGenModule::getDeclVisibilityMode(const Decl *D) const { 119 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 120 if (VD->getStorageClass() == VarDecl::PrivateExtern) 121 return LangOptions::Hidden; 122 123 if (const VisibilityAttr *attr = D->getAttr<VisibilityAttr>()) { 124 switch (attr->getVisibility()) { 125 default: assert(0 && "Unknown visibility!"); 126 case VisibilityAttr::DefaultVisibility: 127 return LangOptions::Default; 128 case VisibilityAttr::HiddenVisibility: 129 return LangOptions::Hidden; 130 case VisibilityAttr::ProtectedVisibility: 131 return LangOptions::Protected; 132 } 133 } 134 135 // This decl should have the same visibility as its parent. 136 if (const DeclContext *DC = D->getDeclContext()) 137 return getDeclVisibilityMode(cast<Decl>(DC)); 138 139 return getLangOptions().getVisibilityMode(); 140} 141 142void CodeGenModule::setGlobalVisibility(llvm::GlobalValue *GV, 143 const Decl *D) const { 144 // Internal definitions always have default visibility. 145 if (GV->hasLocalLinkage()) { 146 GV->setVisibility(llvm::GlobalValue::DefaultVisibility); 147 return; 148 } 149 150 switch (getDeclVisibilityMode(D)) { 151 default: assert(0 && "Unknown visibility!"); 152 case LangOptions::Default: 153 return GV->setVisibility(llvm::GlobalValue::DefaultVisibility); 154 case LangOptions::Hidden: 155 return GV->setVisibility(llvm::GlobalValue::HiddenVisibility); 156 case LangOptions::Protected: 157 return GV->setVisibility(llvm::GlobalValue::ProtectedVisibility); 158 } 159} 160 161const char *CodeGenModule::getMangledName(const GlobalDecl &GD) { 162 const NamedDecl *ND = cast<NamedDecl>(GD.getDecl()); 163 164 if (const CXXConstructorDecl *D = dyn_cast<CXXConstructorDecl>(ND)) 165 return getMangledCXXCtorName(D, GD.getCtorType()); 166 if (const CXXDestructorDecl *D = dyn_cast<CXXDestructorDecl>(ND)) 167 return getMangledCXXDtorName(D, GD.getDtorType()); 168 169 return getMangledName(ND); 170} 171 172/// \brief Retrieves the mangled name for the given declaration. 173/// 174/// If the given declaration requires a mangled name, returns an 175/// const char* containing the mangled name. Otherwise, returns 176/// the unmangled name. 177/// 178const char *CodeGenModule::getMangledName(const NamedDecl *ND) { 179 if (!getMangleContext().shouldMangleDeclName(ND)) { 180 assert(ND->getIdentifier() && "Attempt to mangle unnamed decl."); 181 return ND->getNameAsCString(); 182 } 183 184 llvm::SmallString<256> Name; 185 getMangleContext().mangleName(ND, Name); 186 Name += '\0'; 187 return UniqueMangledName(Name.begin(), Name.end()); 188} 189 190const char *CodeGenModule::UniqueMangledName(const char *NameStart, 191 const char *NameEnd) { 192 assert(*(NameEnd - 1) == '\0' && "Mangled name must be null terminated!"); 193 194 return MangledNames.GetOrCreateValue(NameStart, NameEnd).getKeyData(); 195} 196 197/// AddGlobalCtor - Add a function to the list that will be called before 198/// main() runs. 199void CodeGenModule::AddGlobalCtor(llvm::Function * Ctor, int Priority) { 200 // FIXME: Type coercion of void()* types. 201 GlobalCtors.push_back(std::make_pair(Ctor, Priority)); 202} 203 204/// AddGlobalDtor - Add a function to the list that will be called 205/// when the module is unloaded. 206void CodeGenModule::AddGlobalDtor(llvm::Function * Dtor, int Priority) { 207 // FIXME: Type coercion of void()* types. 208 GlobalDtors.push_back(std::make_pair(Dtor, Priority)); 209} 210 211void CodeGenModule::EmitCtorList(const CtorList &Fns, const char *GlobalName) { 212 // Ctor function type is void()*. 213 llvm::FunctionType* CtorFTy = 214 llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), 215 std::vector<const llvm::Type*>(), 216 false); 217 llvm::Type *CtorPFTy = llvm::PointerType::getUnqual(CtorFTy); 218 219 // Get the type of a ctor entry, { i32, void ()* }. 220 llvm::StructType* CtorStructTy = 221 llvm::StructType::get(VMContext, llvm::Type::getInt32Ty(VMContext), 222 llvm::PointerType::getUnqual(CtorFTy), NULL); 223 224 // Construct the constructor and destructor arrays. 225 std::vector<llvm::Constant*> Ctors; 226 for (CtorList::const_iterator I = Fns.begin(), E = Fns.end(); I != E; ++I) { 227 std::vector<llvm::Constant*> S; 228 S.push_back(llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), 229 I->second, false)); 230 S.push_back(llvm::ConstantExpr::getBitCast(I->first, CtorPFTy)); 231 Ctors.push_back(llvm::ConstantStruct::get(CtorStructTy, S)); 232 } 233 234 if (!Ctors.empty()) { 235 llvm::ArrayType *AT = llvm::ArrayType::get(CtorStructTy, Ctors.size()); 236 new llvm::GlobalVariable(TheModule, AT, false, 237 llvm::GlobalValue::AppendingLinkage, 238 llvm::ConstantArray::get(AT, Ctors), 239 GlobalName); 240 } 241} 242 243void CodeGenModule::EmitAnnotations() { 244 if (Annotations.empty()) 245 return; 246 247 // Create a new global variable for the ConstantStruct in the Module. 248 llvm::Constant *Array = 249 llvm::ConstantArray::get(llvm::ArrayType::get(Annotations[0]->getType(), 250 Annotations.size()), 251 Annotations); 252 llvm::GlobalValue *gv = 253 new llvm::GlobalVariable(TheModule, Array->getType(), false, 254 llvm::GlobalValue::AppendingLinkage, Array, 255 "llvm.global.annotations"); 256 gv->setSection("llvm.metadata"); 257} 258 259static CodeGenModule::GVALinkage 260GetLinkageForFunction(ASTContext &Context, const FunctionDecl *FD, 261 const LangOptions &Features) { 262 CodeGenModule::GVALinkage External = CodeGenModule::GVA_StrongExternal; 263 264 Linkage L = FD->getLinkage(); 265 if (L == ExternalLinkage && Context.getLangOptions().CPlusPlus && 266 FD->getType()->getLinkage() == UniqueExternalLinkage) 267 L = UniqueExternalLinkage; 268 269 switch (L) { 270 case NoLinkage: 271 case InternalLinkage: 272 case UniqueExternalLinkage: 273 return CodeGenModule::GVA_Internal; 274 275 case ExternalLinkage: 276 switch (FD->getTemplateSpecializationKind()) { 277 case TSK_Undeclared: 278 case TSK_ExplicitSpecialization: 279 External = CodeGenModule::GVA_StrongExternal; 280 break; 281 282 case TSK_ExplicitInstantiationDefinition: 283 // FIXME: explicit instantiation definitions should use weak linkage 284 return CodeGenModule::GVA_StrongExternal; 285 286 case TSK_ExplicitInstantiationDeclaration: 287 case TSK_ImplicitInstantiation: 288 External = CodeGenModule::GVA_TemplateInstantiation; 289 break; 290 } 291 } 292 293 if (!FD->isInlined()) 294 return External; 295 296 if (!Features.CPlusPlus || FD->hasAttr<GNUInlineAttr>()) { 297 // GNU or C99 inline semantics. Determine whether this symbol should be 298 // externally visible. 299 if (FD->isInlineDefinitionExternallyVisible()) 300 return External; 301 302 // C99 inline semantics, where the symbol is not externally visible. 303 return CodeGenModule::GVA_C99Inline; 304 } 305 306 // C++0x [temp.explicit]p9: 307 // [ Note: The intent is that an inline function that is the subject of 308 // an explicit instantiation declaration will still be implicitly 309 // instantiated when used so that the body can be considered for 310 // inlining, but that no out-of-line copy of the inline function would be 311 // generated in the translation unit. -- end note ] 312 if (FD->getTemplateSpecializationKind() 313 == TSK_ExplicitInstantiationDeclaration) 314 return CodeGenModule::GVA_C99Inline; 315 316 return CodeGenModule::GVA_CXXInline; 317} 318 319/// SetFunctionDefinitionAttributes - Set attributes for a global. 320/// 321/// FIXME: This is currently only done for aliases and functions, but not for 322/// variables (these details are set in EmitGlobalVarDefinition for variables). 323void CodeGenModule::SetFunctionDefinitionAttributes(const FunctionDecl *D, 324 llvm::GlobalValue *GV) { 325 GVALinkage Linkage = GetLinkageForFunction(getContext(), D, Features); 326 327 if (Linkage == GVA_Internal) { 328 GV->setLinkage(llvm::Function::InternalLinkage); 329 } else if (D->hasAttr<DLLExportAttr>()) { 330 GV->setLinkage(llvm::Function::DLLExportLinkage); 331 } else if (D->hasAttr<WeakAttr>()) { 332 GV->setLinkage(llvm::Function::WeakAnyLinkage); 333 } else if (Linkage == GVA_C99Inline) { 334 // In C99 mode, 'inline' functions are guaranteed to have a strong 335 // definition somewhere else, so we can use available_externally linkage. 336 GV->setLinkage(llvm::Function::AvailableExternallyLinkage); 337 } else if (Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation) { 338 // In C++, the compiler has to emit a definition in every translation unit 339 // that references the function. We should use linkonce_odr because 340 // a) if all references in this translation unit are optimized away, we 341 // don't need to codegen it. b) if the function persists, it needs to be 342 // merged with other definitions. c) C++ has the ODR, so we know the 343 // definition is dependable. 344 GV->setLinkage(llvm::Function::LinkOnceODRLinkage); 345 } else { 346 assert(Linkage == GVA_StrongExternal); 347 // Otherwise, we have strong external linkage. 348 GV->setLinkage(llvm::Function::ExternalLinkage); 349 } 350 351 SetCommonAttributes(D, GV); 352} 353 354void CodeGenModule::SetLLVMFunctionAttributes(const Decl *D, 355 const CGFunctionInfo &Info, 356 llvm::Function *F) { 357 unsigned CallingConv; 358 AttributeListType AttributeList; 359 ConstructAttributeList(Info, D, AttributeList, CallingConv); 360 F->setAttributes(llvm::AttrListPtr::get(AttributeList.begin(), 361 AttributeList.size())); 362 F->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv)); 363} 364 365void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D, 366 llvm::Function *F) { 367 if (!Features.Exceptions && !Features.ObjCNonFragileABI) 368 F->addFnAttr(llvm::Attribute::NoUnwind); 369 370 if (D->hasAttr<AlwaysInlineAttr>()) 371 F->addFnAttr(llvm::Attribute::AlwaysInline); 372 373 if (D->hasAttr<NoInlineAttr>()) 374 F->addFnAttr(llvm::Attribute::NoInline); 375 376 if (Features.getStackProtectorMode() == LangOptions::SSPOn) 377 F->addFnAttr(llvm::Attribute::StackProtect); 378 else if (Features.getStackProtectorMode() == LangOptions::SSPReq) 379 F->addFnAttr(llvm::Attribute::StackProtectReq); 380 381 if (const AlignedAttr *AA = D->getAttr<AlignedAttr>()) { 382 unsigned width = Context.Target.getCharWidth(); 383 F->setAlignment(AA->getAlignment() / width); 384 while ((AA = AA->getNext<AlignedAttr>())) 385 F->setAlignment(std::max(F->getAlignment(), AA->getAlignment() / width)); 386 } 387 // C++ ABI requires 2-byte alignment for member functions. 388 if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D)) 389 F->setAlignment(2); 390} 391 392void CodeGenModule::SetCommonAttributes(const Decl *D, 393 llvm::GlobalValue *GV) { 394 setGlobalVisibility(GV, D); 395 396 if (D->hasAttr<UsedAttr>()) 397 AddUsedGlobal(GV); 398 399 if (const SectionAttr *SA = D->getAttr<SectionAttr>()) 400 GV->setSection(SA->getName()); 401 402 getTargetCodeGenInfo().SetTargetAttributes(D, GV, *this); 403} 404 405void CodeGenModule::SetInternalFunctionAttributes(const Decl *D, 406 llvm::Function *F, 407 const CGFunctionInfo &FI) { 408 SetLLVMFunctionAttributes(D, FI, F); 409 SetLLVMFunctionAttributesForDefinition(D, F); 410 411 F->setLinkage(llvm::Function::InternalLinkage); 412 413 SetCommonAttributes(D, F); 414} 415 416void CodeGenModule::SetFunctionAttributes(GlobalDecl GD, 417 llvm::Function *F, 418 bool IsIncompleteFunction) { 419 const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl()); 420 421 if (!IsIncompleteFunction) 422 SetLLVMFunctionAttributes(FD, getTypes().getFunctionInfo(GD), F); 423 424 // Only a few attributes are set on declarations; these may later be 425 // overridden by a definition. 426 427 if (FD->hasAttr<DLLImportAttr>()) { 428 F->setLinkage(llvm::Function::DLLImportLinkage); 429 } else if (FD->hasAttr<WeakAttr>() || 430 FD->hasAttr<WeakImportAttr>()) { 431 // "extern_weak" is overloaded in LLVM; we probably should have 432 // separate linkage types for this. 433 F->setLinkage(llvm::Function::ExternalWeakLinkage); 434 } else { 435 F->setLinkage(llvm::Function::ExternalLinkage); 436 } 437 438 if (const SectionAttr *SA = FD->getAttr<SectionAttr>()) 439 F->setSection(SA->getName()); 440} 441 442void CodeGenModule::AddUsedGlobal(llvm::GlobalValue *GV) { 443 assert(!GV->isDeclaration() && 444 "Only globals with definition can force usage."); 445 LLVMUsed.push_back(GV); 446} 447 448void CodeGenModule::EmitLLVMUsed() { 449 // Don't create llvm.used if there is no need. 450 if (LLVMUsed.empty()) 451 return; 452 453 const llvm::Type *i8PTy = llvm::Type::getInt8PtrTy(VMContext); 454 455 // Convert LLVMUsed to what ConstantArray needs. 456 std::vector<llvm::Constant*> UsedArray; 457 UsedArray.resize(LLVMUsed.size()); 458 for (unsigned i = 0, e = LLVMUsed.size(); i != e; ++i) { 459 UsedArray[i] = 460 llvm::ConstantExpr::getBitCast(cast<llvm::Constant>(&*LLVMUsed[i]), 461 i8PTy); 462 } 463 464 if (UsedArray.empty()) 465 return; 466 llvm::ArrayType *ATy = llvm::ArrayType::get(i8PTy, UsedArray.size()); 467 468 llvm::GlobalVariable *GV = 469 new llvm::GlobalVariable(getModule(), ATy, false, 470 llvm::GlobalValue::AppendingLinkage, 471 llvm::ConstantArray::get(ATy, UsedArray), 472 "llvm.used"); 473 474 GV->setSection("llvm.metadata"); 475} 476 477void CodeGenModule::EmitDeferred() { 478 // Emit code for any potentially referenced deferred decls. Since a 479 // previously unused static decl may become used during the generation of code 480 // for a static function, iterate until no changes are made. 481 while (!DeferredDeclsToEmit.empty()) { 482 GlobalDecl D = DeferredDeclsToEmit.back(); 483 DeferredDeclsToEmit.pop_back(); 484 485 // The mangled name for the decl must have been emitted in GlobalDeclMap. 486 // Look it up to see if it was defined with a stronger definition (e.g. an 487 // extern inline function with a strong function redefinition). If so, 488 // just ignore the deferred decl. 489 llvm::GlobalValue *CGRef = GlobalDeclMap[getMangledName(D)]; 490 assert(CGRef && "Deferred decl wasn't referenced?"); 491 492 if (!CGRef->isDeclaration()) 493 continue; 494 495 // Otherwise, emit the definition and move on to the next one. 496 EmitGlobalDefinition(D); 497 } 498} 499 500/// EmitAnnotateAttr - Generate the llvm::ConstantStruct which contains the 501/// annotation information for a given GlobalValue. The annotation struct is 502/// {i8 *, i8 *, i8 *, i32}. The first field is a constant expression, the 503/// GlobalValue being annotated. The second field is the constant string 504/// created from the AnnotateAttr's annotation. The third field is a constant 505/// string containing the name of the translation unit. The fourth field is 506/// the line number in the file of the annotated value declaration. 507/// 508/// FIXME: this does not unique the annotation string constants, as llvm-gcc 509/// appears to. 510/// 511llvm::Constant *CodeGenModule::EmitAnnotateAttr(llvm::GlobalValue *GV, 512 const AnnotateAttr *AA, 513 unsigned LineNo) { 514 llvm::Module *M = &getModule(); 515 516 // get [N x i8] constants for the annotation string, and the filename string 517 // which are the 2nd and 3rd elements of the global annotation structure. 518 const llvm::Type *SBP = llvm::Type::getInt8PtrTy(VMContext); 519 llvm::Constant *anno = llvm::ConstantArray::get(VMContext, 520 AA->getAnnotation(), true); 521 llvm::Constant *unit = llvm::ConstantArray::get(VMContext, 522 M->getModuleIdentifier(), 523 true); 524 525 // Get the two global values corresponding to the ConstantArrays we just 526 // created to hold the bytes of the strings. 527 llvm::GlobalValue *annoGV = 528 new llvm::GlobalVariable(*M, anno->getType(), false, 529 llvm::GlobalValue::PrivateLinkage, anno, 530 GV->getName()); 531 // translation unit name string, emitted into the llvm.metadata section. 532 llvm::GlobalValue *unitGV = 533 new llvm::GlobalVariable(*M, unit->getType(), false, 534 llvm::GlobalValue::PrivateLinkage, unit, 535 ".str"); 536 537 // Create the ConstantStruct for the global annotation. 538 llvm::Constant *Fields[4] = { 539 llvm::ConstantExpr::getBitCast(GV, SBP), 540 llvm::ConstantExpr::getBitCast(annoGV, SBP), 541 llvm::ConstantExpr::getBitCast(unitGV, SBP), 542 llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), LineNo) 543 }; 544 return llvm::ConstantStruct::get(VMContext, Fields, 4, false); 545} 546 547bool CodeGenModule::MayDeferGeneration(const ValueDecl *Global) { 548 // Never defer when EmitAllDecls is specified or the decl has 549 // attribute used. 550 if (Features.EmitAllDecls || Global->hasAttr<UsedAttr>()) 551 return false; 552 553 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Global)) { 554 // Constructors and destructors should never be deferred. 555 if (FD->hasAttr<ConstructorAttr>() || 556 FD->hasAttr<DestructorAttr>()) 557 return false; 558 559 // The key function for a class must never be deferred. 560 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Global)) { 561 const CXXRecordDecl *RD = MD->getParent(); 562 if (MD->isOutOfLine() && RD->isDynamicClass()) { 563 const CXXMethodDecl *KeyFunction = getContext().getKeyFunction(RD); 564 if (KeyFunction && 565 KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 566 return false; 567 } 568 } 569 570 GVALinkage Linkage = GetLinkageForFunction(getContext(), FD, Features); 571 572 // static, static inline, always_inline, and extern inline functions can 573 // always be deferred. Normal inline functions can be deferred in C99/C++. 574 if (Linkage == GVA_Internal || Linkage == GVA_C99Inline || 575 Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation) 576 return true; 577 return false; 578 } 579 580 const VarDecl *VD = cast<VarDecl>(Global); 581 assert(VD->isFileVarDecl() && "Invalid decl"); 582 583 // We never want to defer structs that have non-trivial constructors or 584 // destructors. 585 586 // FIXME: Handle references. 587 if (const RecordType *RT = VD->getType()->getAs<RecordType>()) { 588 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl())) { 589 if (!RD->hasTrivialConstructor() || !RD->hasTrivialDestructor()) 590 return false; 591 } 592 } 593 594 // Static data may be deferred, but out-of-line static data members 595 // cannot be. 596 Linkage L = VD->getLinkage(); 597 if (L == ExternalLinkage && getContext().getLangOptions().CPlusPlus && 598 VD->getType()->getLinkage() == UniqueExternalLinkage) 599 L = UniqueExternalLinkage; 600 601 switch (L) { 602 case NoLinkage: 603 case InternalLinkage: 604 case UniqueExternalLinkage: 605 // Initializer has side effects? 606 if (VD->getInit() && VD->getInit()->HasSideEffects(Context)) 607 return false; 608 return !(VD->isStaticDataMember() && VD->isOutOfLine()); 609 610 case ExternalLinkage: 611 break; 612 } 613 614 return false; 615} 616 617void CodeGenModule::EmitGlobal(GlobalDecl GD) { 618 const ValueDecl *Global = cast<ValueDecl>(GD.getDecl()); 619 620 // If this is an alias definition (which otherwise looks like a declaration) 621 // emit it now. 622 if (Global->hasAttr<AliasAttr>()) 623 return EmitAliasDefinition(Global); 624 625 // Ignore declarations, they will be emitted on their first use. 626 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Global)) { 627 // Forward declarations are emitted lazily on first use. 628 if (!FD->isThisDeclarationADefinition()) 629 return; 630 } else { 631 const VarDecl *VD = cast<VarDecl>(Global); 632 assert(VD->isFileVarDecl() && "Cannot emit local var decl as global."); 633 634 if (VD->isThisDeclarationADefinition() != VarDecl::Definition) 635 return; 636 } 637 638 // Defer code generation when possible if this is a static definition, inline 639 // function etc. These we only want to emit if they are used. 640 if (MayDeferGeneration(Global)) { 641 // If the value has already been used, add it directly to the 642 // DeferredDeclsToEmit list. 643 const char *MangledName = getMangledName(GD); 644 if (GlobalDeclMap.count(MangledName)) 645 DeferredDeclsToEmit.push_back(GD); 646 else { 647 // Otherwise, remember that we saw a deferred decl with this name. The 648 // first use of the mangled name will cause it to move into 649 // DeferredDeclsToEmit. 650 DeferredDecls[MangledName] = GD; 651 } 652 return; 653 } 654 655 // Otherwise emit the definition. 656 EmitGlobalDefinition(GD); 657} 658 659void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD) { 660 const ValueDecl *D = cast<ValueDecl>(GD.getDecl()); 661 662 PrettyStackTraceDecl CrashInfo((ValueDecl *)D, D->getLocation(), 663 Context.getSourceManager(), 664 "Generating code for declaration"); 665 666 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 667 getVtableInfo().MaybeEmitVtable(GD); 668 if (MD->isVirtual() && MD->isOutOfLine() && 669 (!isa<CXXDestructorDecl>(D) || GD.getDtorType() != Dtor_Base)) { 670 if (isa<CXXDestructorDecl>(D)) { 671 GlobalDecl CanonGD(cast<CXXDestructorDecl>(D->getCanonicalDecl()), 672 GD.getDtorType()); 673 BuildThunksForVirtual(CanonGD); 674 } else { 675 BuildThunksForVirtual(MD->getCanonicalDecl()); 676 } 677 } 678 } 679 680 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 681 EmitCXXConstructor(CD, GD.getCtorType()); 682 else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(D)) 683 EmitCXXDestructor(DD, GD.getDtorType()); 684 else if (isa<FunctionDecl>(D)) 685 EmitGlobalFunctionDefinition(GD); 686 else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 687 EmitGlobalVarDefinition(VD); 688 else { 689 assert(0 && "Invalid argument to EmitGlobalDefinition()"); 690 } 691} 692 693/// GetOrCreateLLVMFunction - If the specified mangled name is not in the 694/// module, create and return an llvm Function with the specified type. If there 695/// is something in the module with the specified name, return it potentially 696/// bitcasted to the right type. 697/// 698/// If D is non-null, it specifies a decl that correspond to this. This is used 699/// to set the attributes on the function when it is first created. 700llvm::Constant *CodeGenModule::GetOrCreateLLVMFunction(const char *MangledName, 701 const llvm::Type *Ty, 702 GlobalDecl D) { 703 // Lookup the entry, lazily creating it if necessary. 704 llvm::GlobalValue *&Entry = GlobalDeclMap[MangledName]; 705 if (Entry) { 706 if (Entry->getType()->getElementType() == Ty) 707 return Entry; 708 709 // Make sure the result is of the correct type. 710 const llvm::Type *PTy = llvm::PointerType::getUnqual(Ty); 711 return llvm::ConstantExpr::getBitCast(Entry, PTy); 712 } 713 714 // This function doesn't have a complete type (for example, the return 715 // type is an incomplete struct). Use a fake type instead, and make 716 // sure not to try to set attributes. 717 bool IsIncompleteFunction = false; 718 if (!isa<llvm::FunctionType>(Ty)) { 719 Ty = llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), 720 std::vector<const llvm::Type*>(), false); 721 IsIncompleteFunction = true; 722 } 723 llvm::Function *F = llvm::Function::Create(cast<llvm::FunctionType>(Ty), 724 llvm::Function::ExternalLinkage, 725 "", &getModule()); 726 F->setName(MangledName); 727 if (D.getDecl()) 728 SetFunctionAttributes(D, F, IsIncompleteFunction); 729 Entry = F; 730 731 // This is the first use or definition of a mangled name. If there is a 732 // deferred decl with this name, remember that we need to emit it at the end 733 // of the file. 734 llvm::DenseMap<const char*, GlobalDecl>::iterator DDI = 735 DeferredDecls.find(MangledName); 736 if (DDI != DeferredDecls.end()) { 737 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit 738 // list, and remove it from DeferredDecls (since we don't need it anymore). 739 DeferredDeclsToEmit.push_back(DDI->second); 740 DeferredDecls.erase(DDI); 741 } else if (const FunctionDecl *FD = cast_or_null<FunctionDecl>(D.getDecl())) { 742 // If this the first reference to a C++ inline function in a class, queue up 743 // the deferred function body for emission. These are not seen as 744 // top-level declarations. 745 if (FD->isThisDeclarationADefinition() && MayDeferGeneration(FD)) 746 DeferredDeclsToEmit.push_back(D); 747 // A called constructor which has no definition or declaration need be 748 // synthesized. 749 else if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) { 750 if (CD->isImplicit()) 751 DeferredDeclsToEmit.push_back(D); 752 } else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(FD)) { 753 if (DD->isImplicit()) 754 DeferredDeclsToEmit.push_back(D); 755 } else if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 756 if (MD->isCopyAssignment() && MD->isImplicit()) 757 DeferredDeclsToEmit.push_back(D); 758 } 759 } 760 761 return F; 762} 763 764/// GetAddrOfFunction - Return the address of the given function. If Ty is 765/// non-null, then this function will use the specified type if it has to 766/// create it (this occurs when we see a definition of the function). 767llvm::Constant *CodeGenModule::GetAddrOfFunction(GlobalDecl GD, 768 const llvm::Type *Ty) { 769 // If there was no specific requested type, just convert it now. 770 if (!Ty) 771 Ty = getTypes().ConvertType(cast<ValueDecl>(GD.getDecl())->getType()); 772 return GetOrCreateLLVMFunction(getMangledName(GD), Ty, GD); 773} 774 775/// CreateRuntimeFunction - Create a new runtime function with the specified 776/// type and name. 777llvm::Constant * 778CodeGenModule::CreateRuntimeFunction(const llvm::FunctionType *FTy, 779 const char *Name) { 780 // Convert Name to be a uniqued string from the IdentifierInfo table. 781 Name = getContext().Idents.get(Name).getNameStart(); 782 return GetOrCreateLLVMFunction(Name, FTy, GlobalDecl()); 783} 784 785static bool DeclIsConstantGlobal(ASTContext &Context, const VarDecl *D) { 786 if (!D->getType().isConstant(Context) && !D->getType()->isReferenceType()) 787 return false; 788 if (Context.getLangOptions().CPlusPlus && 789 Context.getBaseElementType(D->getType())->getAs<RecordType>()) { 790 // FIXME: We should do something fancier here! 791 return false; 792 } 793 return true; 794} 795 796/// GetOrCreateLLVMGlobal - If the specified mangled name is not in the module, 797/// create and return an llvm GlobalVariable with the specified type. If there 798/// is something in the module with the specified name, return it potentially 799/// bitcasted to the right type. 800/// 801/// If D is non-null, it specifies a decl that correspond to this. This is used 802/// to set the attributes on the global when it is first created. 803llvm::Constant *CodeGenModule::GetOrCreateLLVMGlobal(const char *MangledName, 804 const llvm::PointerType*Ty, 805 const VarDecl *D) { 806 // Lookup the entry, lazily creating it if necessary. 807 llvm::GlobalValue *&Entry = GlobalDeclMap[MangledName]; 808 if (Entry) { 809 if (Entry->getType() == Ty) 810 return Entry; 811 812 // Make sure the result is of the correct type. 813 return llvm::ConstantExpr::getBitCast(Entry, Ty); 814 } 815 816 // This is the first use or definition of a mangled name. If there is a 817 // deferred decl with this name, remember that we need to emit it at the end 818 // of the file. 819 llvm::DenseMap<const char*, GlobalDecl>::iterator DDI = 820 DeferredDecls.find(MangledName); 821 if (DDI != DeferredDecls.end()) { 822 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit 823 // list, and remove it from DeferredDecls (since we don't need it anymore). 824 DeferredDeclsToEmit.push_back(DDI->second); 825 DeferredDecls.erase(DDI); 826 } 827 828 llvm::GlobalVariable *GV = 829 new llvm::GlobalVariable(getModule(), Ty->getElementType(), false, 830 llvm::GlobalValue::ExternalLinkage, 831 0, "", 0, 832 false, Ty->getAddressSpace()); 833 GV->setName(MangledName); 834 835 // Handle things which are present even on external declarations. 836 if (D) { 837 // FIXME: This code is overly simple and should be merged with other global 838 // handling. 839 GV->setConstant(DeclIsConstantGlobal(Context, D)); 840 841 // FIXME: Merge with other attribute handling code. 842 if (D->getStorageClass() == VarDecl::PrivateExtern) 843 GV->setVisibility(llvm::GlobalValue::HiddenVisibility); 844 845 if (D->hasAttr<WeakAttr>() || 846 D->hasAttr<WeakImportAttr>()) 847 GV->setLinkage(llvm::GlobalValue::ExternalWeakLinkage); 848 849 GV->setThreadLocal(D->isThreadSpecified()); 850 } 851 852 return Entry = GV; 853} 854 855 856/// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the 857/// given global variable. If Ty is non-null and if the global doesn't exist, 858/// then it will be greated with the specified type instead of whatever the 859/// normal requested type would be. 860llvm::Constant *CodeGenModule::GetAddrOfGlobalVar(const VarDecl *D, 861 const llvm::Type *Ty) { 862 assert(D->hasGlobalStorage() && "Not a global variable"); 863 QualType ASTTy = D->getType(); 864 if (Ty == 0) 865 Ty = getTypes().ConvertTypeForMem(ASTTy); 866 867 const llvm::PointerType *PTy = 868 llvm::PointerType::get(Ty, ASTTy.getAddressSpace()); 869 return GetOrCreateLLVMGlobal(getMangledName(D), PTy, D); 870} 871 872/// CreateRuntimeVariable - Create a new runtime global variable with the 873/// specified type and name. 874llvm::Constant * 875CodeGenModule::CreateRuntimeVariable(const llvm::Type *Ty, 876 const char *Name) { 877 // Convert Name to be a uniqued string from the IdentifierInfo table. 878 Name = getContext().Idents.get(Name).getNameStart(); 879 return GetOrCreateLLVMGlobal(Name, llvm::PointerType::getUnqual(Ty), 0); 880} 881 882void CodeGenModule::EmitTentativeDefinition(const VarDecl *D) { 883 assert(!D->getInit() && "Cannot emit definite definitions here!"); 884 885 if (MayDeferGeneration(D)) { 886 // If we have not seen a reference to this variable yet, place it 887 // into the deferred declarations table to be emitted if needed 888 // later. 889 const char *MangledName = getMangledName(D); 890 if (GlobalDeclMap.count(MangledName) == 0) { 891 DeferredDecls[MangledName] = D; 892 return; 893 } 894 } 895 896 // The tentative definition is the only definition. 897 EmitGlobalVarDefinition(D); 898} 899 900llvm::GlobalVariable::LinkageTypes 901CodeGenModule::getVtableLinkage(const CXXRecordDecl *RD) { 902 if (RD->isInAnonymousNamespace() || !RD->hasLinkage()) 903 return llvm::GlobalVariable::InternalLinkage; 904 905 if (const CXXMethodDecl *KeyFunction 906 = RD->getASTContext().getKeyFunction(RD)) { 907 // If this class has a key function, use that to determine the linkage of 908 // the vtable. 909 const FunctionDecl *Def = 0; 910 if (KeyFunction->getBody(Def)) 911 KeyFunction = cast<CXXMethodDecl>(Def); 912 913 switch (KeyFunction->getTemplateSpecializationKind()) { 914 case TSK_Undeclared: 915 case TSK_ExplicitSpecialization: 916 if (KeyFunction->isInlined()) 917 return llvm::GlobalVariable::WeakODRLinkage; 918 919 return llvm::GlobalVariable::ExternalLinkage; 920 921 case TSK_ImplicitInstantiation: 922 case TSK_ExplicitInstantiationDefinition: 923 return llvm::GlobalVariable::WeakODRLinkage; 924 925 case TSK_ExplicitInstantiationDeclaration: 926 // FIXME: Use available_externally linkage. However, this currently 927 // breaks LLVM's build due to undefined symbols. 928 // return llvm::GlobalVariable::AvailableExternallyLinkage; 929 return llvm::GlobalVariable::WeakODRLinkage; 930 } 931 } 932 933 switch (RD->getTemplateSpecializationKind()) { 934 case TSK_Undeclared: 935 case TSK_ExplicitSpecialization: 936 case TSK_ImplicitInstantiation: 937 case TSK_ExplicitInstantiationDefinition: 938 return llvm::GlobalVariable::WeakODRLinkage; 939 940 case TSK_ExplicitInstantiationDeclaration: 941 // FIXME: Use available_externally linkage. However, this currently 942 // breaks LLVM's build due to undefined symbols. 943 // return llvm::GlobalVariable::AvailableExternallyLinkage; 944 return llvm::GlobalVariable::WeakODRLinkage; 945 } 946 947 // Silence GCC warning. 948 return llvm::GlobalVariable::WeakODRLinkage; 949} 950 951static CodeGenModule::GVALinkage 952GetLinkageForVariable(ASTContext &Context, const VarDecl *VD) { 953 // If this is a static data member, compute the kind of template 954 // specialization. Otherwise, this variable is not part of a 955 // template. 956 TemplateSpecializationKind TSK = TSK_Undeclared; 957 if (VD->isStaticDataMember()) 958 TSK = VD->getTemplateSpecializationKind(); 959 960 Linkage L = VD->getLinkage(); 961 if (L == ExternalLinkage && Context.getLangOptions().CPlusPlus && 962 VD->getType()->getLinkage() == UniqueExternalLinkage) 963 L = UniqueExternalLinkage; 964 965 switch (L) { 966 case NoLinkage: 967 case InternalLinkage: 968 case UniqueExternalLinkage: 969 return CodeGenModule::GVA_Internal; 970 971 case ExternalLinkage: 972 switch (TSK) { 973 case TSK_Undeclared: 974 case TSK_ExplicitSpecialization: 975 976 // FIXME: ExplicitInstantiationDefinition should be weak! 977 case TSK_ExplicitInstantiationDefinition: 978 return CodeGenModule::GVA_StrongExternal; 979 980 case TSK_ExplicitInstantiationDeclaration: 981 llvm_unreachable("Variable should not be instantiated"); 982 // Fall through to treat this like any other instantiation. 983 984 case TSK_ImplicitInstantiation: 985 return CodeGenModule::GVA_TemplateInstantiation; 986 } 987 } 988 989 return CodeGenModule::GVA_StrongExternal; 990} 991 992CharUnits CodeGenModule::GetTargetTypeStoreSize(const llvm::Type *Ty) const { 993 return CharUnits::fromQuantity( 994 TheTargetData.getTypeStoreSizeInBits(Ty) / Context.getCharWidth()); 995} 996 997void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D) { 998 llvm::Constant *Init = 0; 999 QualType ASTTy = D->getType(); 1000 bool NonConstInit = false; 1001 1002 const Expr *InitExpr = D->getAnyInitializer(); 1003 1004 if (!InitExpr) { 1005 // This is a tentative definition; tentative definitions are 1006 // implicitly initialized with { 0 }. 1007 // 1008 // Note that tentative definitions are only emitted at the end of 1009 // a translation unit, so they should never have incomplete 1010 // type. In addition, EmitTentativeDefinition makes sure that we 1011 // never attempt to emit a tentative definition if a real one 1012 // exists. A use may still exists, however, so we still may need 1013 // to do a RAUW. 1014 assert(!ASTTy->isIncompleteType() && "Unexpected incomplete type"); 1015 Init = EmitNullConstant(D->getType()); 1016 } else { 1017 Init = EmitConstantExpr(InitExpr, D->getType()); 1018 1019 if (!Init) { 1020 QualType T = InitExpr->getType(); 1021 if (getLangOptions().CPlusPlus) { 1022 EmitCXXGlobalVarDeclInitFunc(D); 1023 Init = EmitNullConstant(T); 1024 NonConstInit = true; 1025 } else { 1026 ErrorUnsupported(D, "static initializer"); 1027 Init = llvm::UndefValue::get(getTypes().ConvertType(T)); 1028 } 1029 } 1030 } 1031 1032 const llvm::Type* InitType = Init->getType(); 1033 llvm::Constant *Entry = GetAddrOfGlobalVar(D, InitType); 1034 1035 // Strip off a bitcast if we got one back. 1036 if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) { 1037 assert(CE->getOpcode() == llvm::Instruction::BitCast || 1038 // all zero index gep. 1039 CE->getOpcode() == llvm::Instruction::GetElementPtr); 1040 Entry = CE->getOperand(0); 1041 } 1042 1043 // Entry is now either a Function or GlobalVariable. 1044 llvm::GlobalVariable *GV = dyn_cast<llvm::GlobalVariable>(Entry); 1045 1046 // We have a definition after a declaration with the wrong type. 1047 // We must make a new GlobalVariable* and update everything that used OldGV 1048 // (a declaration or tentative definition) with the new GlobalVariable* 1049 // (which will be a definition). 1050 // 1051 // This happens if there is a prototype for a global (e.g. 1052 // "extern int x[];") and then a definition of a different type (e.g. 1053 // "int x[10];"). This also happens when an initializer has a different type 1054 // from the type of the global (this happens with unions). 1055 if (GV == 0 || 1056 GV->getType()->getElementType() != InitType || 1057 GV->getType()->getAddressSpace() != ASTTy.getAddressSpace()) { 1058 1059 // Remove the old entry from GlobalDeclMap so that we'll create a new one. 1060 GlobalDeclMap.erase(getMangledName(D)); 1061 1062 // Make a new global with the correct type, this is now guaranteed to work. 1063 GV = cast<llvm::GlobalVariable>(GetAddrOfGlobalVar(D, InitType)); 1064 GV->takeName(cast<llvm::GlobalValue>(Entry)); 1065 1066 // Replace all uses of the old global with the new global 1067 llvm::Constant *NewPtrForOldDecl = 1068 llvm::ConstantExpr::getBitCast(GV, Entry->getType()); 1069 Entry->replaceAllUsesWith(NewPtrForOldDecl); 1070 1071 // Erase the old global, since it is no longer used. 1072 cast<llvm::GlobalValue>(Entry)->eraseFromParent(); 1073 } 1074 1075 if (const AnnotateAttr *AA = D->getAttr<AnnotateAttr>()) { 1076 SourceManager &SM = Context.getSourceManager(); 1077 AddAnnotation(EmitAnnotateAttr(GV, AA, 1078 SM.getInstantiationLineNumber(D->getLocation()))); 1079 } 1080 1081 GV->setInitializer(Init); 1082 1083 // If it is safe to mark the global 'constant', do so now. 1084 GV->setConstant(false); 1085 if (!NonConstInit && DeclIsConstantGlobal(Context, D)) 1086 GV->setConstant(true); 1087 1088 GV->setAlignment(getContext().getDeclAlign(D).getQuantity()); 1089 1090 // Set the llvm linkage type as appropriate. 1091 GVALinkage Linkage = GetLinkageForVariable(getContext(), D); 1092 if (Linkage == GVA_Internal) 1093 GV->setLinkage(llvm::Function::InternalLinkage); 1094 else if (D->hasAttr<DLLImportAttr>()) 1095 GV->setLinkage(llvm::Function::DLLImportLinkage); 1096 else if (D->hasAttr<DLLExportAttr>()) 1097 GV->setLinkage(llvm::Function::DLLExportLinkage); 1098 else if (D->hasAttr<WeakAttr>()) { 1099 if (GV->isConstant()) 1100 GV->setLinkage(llvm::GlobalVariable::WeakODRLinkage); 1101 else 1102 GV->setLinkage(llvm::GlobalVariable::WeakAnyLinkage); 1103 } else if (Linkage == GVA_TemplateInstantiation) 1104 GV->setLinkage(llvm::GlobalVariable::WeakAnyLinkage); 1105 else if (!getLangOptions().CPlusPlus && !CodeGenOpts.NoCommon && 1106 !D->hasExternalStorage() && !D->getInit() && 1107 !D->getAttr<SectionAttr>()) { 1108 GV->setLinkage(llvm::GlobalVariable::CommonLinkage); 1109 // common vars aren't constant even if declared const. 1110 GV->setConstant(false); 1111 } else 1112 GV->setLinkage(llvm::GlobalVariable::ExternalLinkage); 1113 1114 SetCommonAttributes(D, GV); 1115 1116 // Emit global variable debug information. 1117 if (CGDebugInfo *DI = getDebugInfo()) { 1118 DI->setLocation(D->getLocation()); 1119 DI->EmitGlobalVariable(GV, D); 1120 } 1121} 1122 1123/// ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we 1124/// implement a function with no prototype, e.g. "int foo() {}". If there are 1125/// existing call uses of the old function in the module, this adjusts them to 1126/// call the new function directly. 1127/// 1128/// This is not just a cleanup: the always_inline pass requires direct calls to 1129/// functions to be able to inline them. If there is a bitcast in the way, it 1130/// won't inline them. Instcombine normally deletes these calls, but it isn't 1131/// run at -O0. 1132static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old, 1133 llvm::Function *NewFn) { 1134 // If we're redefining a global as a function, don't transform it. 1135 llvm::Function *OldFn = dyn_cast<llvm::Function>(Old); 1136 if (OldFn == 0) return; 1137 1138 const llvm::Type *NewRetTy = NewFn->getReturnType(); 1139 llvm::SmallVector<llvm::Value*, 4> ArgList; 1140 1141 for (llvm::Value::use_iterator UI = OldFn->use_begin(), E = OldFn->use_end(); 1142 UI != E; ) { 1143 // TODO: Do invokes ever occur in C code? If so, we should handle them too. 1144 unsigned OpNo = UI.getOperandNo(); 1145 llvm::CallInst *CI = dyn_cast<llvm::CallInst>(*UI++); 1146 if (!CI || OpNo != 0) continue; 1147 1148 // If the return types don't match exactly, and if the call isn't dead, then 1149 // we can't transform this call. 1150 if (CI->getType() != NewRetTy && !CI->use_empty()) 1151 continue; 1152 1153 // If the function was passed too few arguments, don't transform. If extra 1154 // arguments were passed, we silently drop them. If any of the types 1155 // mismatch, we don't transform. 1156 unsigned ArgNo = 0; 1157 bool DontTransform = false; 1158 for (llvm::Function::arg_iterator AI = NewFn->arg_begin(), 1159 E = NewFn->arg_end(); AI != E; ++AI, ++ArgNo) { 1160 if (CI->getNumOperands()-1 == ArgNo || 1161 CI->getOperand(ArgNo+1)->getType() != AI->getType()) { 1162 DontTransform = true; 1163 break; 1164 } 1165 } 1166 if (DontTransform) 1167 continue; 1168 1169 // Okay, we can transform this. Create the new call instruction and copy 1170 // over the required information. 1171 ArgList.append(CI->op_begin()+1, CI->op_begin()+1+ArgNo); 1172 llvm::CallInst *NewCall = llvm::CallInst::Create(NewFn, ArgList.begin(), 1173 ArgList.end(), "", CI); 1174 ArgList.clear(); 1175 if (!NewCall->getType()->isVoidTy()) 1176 NewCall->takeName(CI); 1177 NewCall->setAttributes(CI->getAttributes()); 1178 NewCall->setCallingConv(CI->getCallingConv()); 1179 1180 // Finally, remove the old call, replacing any uses with the new one. 1181 if (!CI->use_empty()) 1182 CI->replaceAllUsesWith(NewCall); 1183 1184 // Copy any custom metadata attached with CI. 1185 if (llvm::MDNode *DbgNode = CI->getMetadata("dbg")) 1186 NewCall->setMetadata("dbg", DbgNode); 1187 CI->eraseFromParent(); 1188 } 1189} 1190 1191 1192void CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD) { 1193 const llvm::FunctionType *Ty; 1194 const FunctionDecl *D = cast<FunctionDecl>(GD.getDecl()); 1195 1196 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 1197 bool isVariadic = D->getType()->getAs<FunctionProtoType>()->isVariadic(); 1198 1199 Ty = getTypes().GetFunctionType(getTypes().getFunctionInfo(MD), isVariadic); 1200 } else { 1201 Ty = cast<llvm::FunctionType>(getTypes().ConvertType(D->getType())); 1202 1203 // As a special case, make sure that definitions of K&R function 1204 // "type foo()" aren't declared as varargs (which forces the backend 1205 // to do unnecessary work). 1206 if (D->getType()->isFunctionNoProtoType()) { 1207 assert(Ty->isVarArg() && "Didn't lower type as expected"); 1208 // Due to stret, the lowered function could have arguments. 1209 // Just create the same type as was lowered by ConvertType 1210 // but strip off the varargs bit. 1211 std::vector<const llvm::Type*> Args(Ty->param_begin(), Ty->param_end()); 1212 Ty = llvm::FunctionType::get(Ty->getReturnType(), Args, false); 1213 } 1214 } 1215 1216 // Get or create the prototype for the function. 1217 llvm::Constant *Entry = GetAddrOfFunction(GD, Ty); 1218 1219 // Strip off a bitcast if we got one back. 1220 if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) { 1221 assert(CE->getOpcode() == llvm::Instruction::BitCast); 1222 Entry = CE->getOperand(0); 1223 } 1224 1225 1226 if (cast<llvm::GlobalValue>(Entry)->getType()->getElementType() != Ty) { 1227 llvm::GlobalValue *OldFn = cast<llvm::GlobalValue>(Entry); 1228 1229 // If the types mismatch then we have to rewrite the definition. 1230 assert(OldFn->isDeclaration() && 1231 "Shouldn't replace non-declaration"); 1232 1233 // F is the Function* for the one with the wrong type, we must make a new 1234 // Function* and update everything that used F (a declaration) with the new 1235 // Function* (which will be a definition). 1236 // 1237 // This happens if there is a prototype for a function 1238 // (e.g. "int f()") and then a definition of a different type 1239 // (e.g. "int f(int x)"). Start by making a new function of the 1240 // correct type, RAUW, then steal the name. 1241 GlobalDeclMap.erase(getMangledName(D)); 1242 llvm::Function *NewFn = cast<llvm::Function>(GetAddrOfFunction(GD, Ty)); 1243 NewFn->takeName(OldFn); 1244 1245 // If this is an implementation of a function without a prototype, try to 1246 // replace any existing uses of the function (which may be calls) with uses 1247 // of the new function 1248 if (D->getType()->isFunctionNoProtoType()) { 1249 ReplaceUsesOfNonProtoTypeWithRealFunction(OldFn, NewFn); 1250 OldFn->removeDeadConstantUsers(); 1251 } 1252 1253 // Replace uses of F with the Function we will endow with a body. 1254 if (!Entry->use_empty()) { 1255 llvm::Constant *NewPtrForOldDecl = 1256 llvm::ConstantExpr::getBitCast(NewFn, Entry->getType()); 1257 Entry->replaceAllUsesWith(NewPtrForOldDecl); 1258 } 1259 1260 // Ok, delete the old function now, which is dead. 1261 OldFn->eraseFromParent(); 1262 1263 Entry = NewFn; 1264 } 1265 1266 llvm::Function *Fn = cast<llvm::Function>(Entry); 1267 1268 CodeGenFunction(*this).GenerateCode(D, Fn); 1269 1270 SetFunctionDefinitionAttributes(D, Fn); 1271 SetLLVMFunctionAttributesForDefinition(D, Fn); 1272 1273 if (const ConstructorAttr *CA = D->getAttr<ConstructorAttr>()) 1274 AddGlobalCtor(Fn, CA->getPriority()); 1275 if (const DestructorAttr *DA = D->getAttr<DestructorAttr>()) 1276 AddGlobalDtor(Fn, DA->getPriority()); 1277} 1278 1279void CodeGenModule::EmitAliasDefinition(const ValueDecl *D) { 1280 const AliasAttr *AA = D->getAttr<AliasAttr>(); 1281 assert(AA && "Not an alias?"); 1282 1283 const llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType()); 1284 1285 // Unique the name through the identifier table. 1286 const char *AliaseeName = 1287 getContext().Idents.get(AA->getAliasee()).getNameStart(); 1288 1289 // Create a reference to the named value. This ensures that it is emitted 1290 // if a deferred decl. 1291 llvm::Constant *Aliasee; 1292 if (isa<llvm::FunctionType>(DeclTy)) 1293 Aliasee = GetOrCreateLLVMFunction(AliaseeName, DeclTy, GlobalDecl()); 1294 else 1295 Aliasee = GetOrCreateLLVMGlobal(AliaseeName, 1296 llvm::PointerType::getUnqual(DeclTy), 0); 1297 1298 // Create the new alias itself, but don't set a name yet. 1299 llvm::GlobalValue *GA = 1300 new llvm::GlobalAlias(Aliasee->getType(), 1301 llvm::Function::ExternalLinkage, 1302 "", Aliasee, &getModule()); 1303 1304 // See if there is already something with the alias' name in the module. 1305 const char *MangledName = getMangledName(D); 1306 llvm::GlobalValue *&Entry = GlobalDeclMap[MangledName]; 1307 1308 if (Entry && !Entry->isDeclaration()) { 1309 // If there is a definition in the module, then it wins over the alias. 1310 // This is dubious, but allow it to be safe. Just ignore the alias. 1311 GA->eraseFromParent(); 1312 return; 1313 } 1314 1315 if (Entry) { 1316 // If there is a declaration in the module, then we had an extern followed 1317 // by the alias, as in: 1318 // extern int test6(); 1319 // ... 1320 // int test6() __attribute__((alias("test7"))); 1321 // 1322 // Remove it and replace uses of it with the alias. 1323 1324 Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GA, 1325 Entry->getType())); 1326 Entry->eraseFromParent(); 1327 } 1328 1329 // Now we know that there is no conflict, set the name. 1330 Entry = GA; 1331 GA->setName(MangledName); 1332 1333 // Set attributes which are particular to an alias; this is a 1334 // specialization of the attributes which may be set on a global 1335 // variable/function. 1336 if (D->hasAttr<DLLExportAttr>()) { 1337 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1338 // The dllexport attribute is ignored for undefined symbols. 1339 if (FD->getBody()) 1340 GA->setLinkage(llvm::Function::DLLExportLinkage); 1341 } else { 1342 GA->setLinkage(llvm::Function::DLLExportLinkage); 1343 } 1344 } else if (D->hasAttr<WeakAttr>() || 1345 D->hasAttr<WeakImportAttr>()) { 1346 GA->setLinkage(llvm::Function::WeakAnyLinkage); 1347 } 1348 1349 SetCommonAttributes(D, GA); 1350} 1351 1352/// getBuiltinLibFunction - Given a builtin id for a function like 1353/// "__builtin_fabsf", return a Function* for "fabsf". 1354llvm::Value *CodeGenModule::getBuiltinLibFunction(const FunctionDecl *FD, 1355 unsigned BuiltinID) { 1356 assert((Context.BuiltinInfo.isLibFunction(BuiltinID) || 1357 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) && 1358 "isn't a lib fn"); 1359 1360 // Get the name, skip over the __builtin_ prefix (if necessary). 1361 const char *Name = Context.BuiltinInfo.GetName(BuiltinID); 1362 if (Context.BuiltinInfo.isLibFunction(BuiltinID)) 1363 Name += 10; 1364 1365 const llvm::FunctionType *Ty = 1366 cast<llvm::FunctionType>(getTypes().ConvertType(FD->getType())); 1367 1368 // Unique the name through the identifier table. 1369 Name = getContext().Idents.get(Name).getNameStart(); 1370 return GetOrCreateLLVMFunction(Name, Ty, GlobalDecl(FD)); 1371} 1372 1373llvm::Function *CodeGenModule::getIntrinsic(unsigned IID,const llvm::Type **Tys, 1374 unsigned NumTys) { 1375 return llvm::Intrinsic::getDeclaration(&getModule(), 1376 (llvm::Intrinsic::ID)IID, Tys, NumTys); 1377} 1378 1379llvm::Function *CodeGenModule::getMemCpyFn() { 1380 if (MemCpyFn) return MemCpyFn; 1381 const llvm::Type *IntPtr = TheTargetData.getIntPtrType(VMContext); 1382 return MemCpyFn = getIntrinsic(llvm::Intrinsic::memcpy, &IntPtr, 1); 1383} 1384 1385llvm::Function *CodeGenModule::getMemMoveFn() { 1386 if (MemMoveFn) return MemMoveFn; 1387 const llvm::Type *IntPtr = TheTargetData.getIntPtrType(VMContext); 1388 return MemMoveFn = getIntrinsic(llvm::Intrinsic::memmove, &IntPtr, 1); 1389} 1390 1391llvm::Function *CodeGenModule::getMemSetFn() { 1392 if (MemSetFn) return MemSetFn; 1393 const llvm::Type *IntPtr = TheTargetData.getIntPtrType(VMContext); 1394 return MemSetFn = getIntrinsic(llvm::Intrinsic::memset, &IntPtr, 1); 1395} 1396 1397static llvm::StringMapEntry<llvm::Constant*> & 1398GetConstantCFStringEntry(llvm::StringMap<llvm::Constant*> &Map, 1399 const StringLiteral *Literal, 1400 bool TargetIsLSB, 1401 bool &IsUTF16, 1402 unsigned &StringLength) { 1403 unsigned NumBytes = Literal->getByteLength(); 1404 1405 // Check for simple case. 1406 if (!Literal->containsNonAsciiOrNull()) { 1407 StringLength = NumBytes; 1408 return Map.GetOrCreateValue(llvm::StringRef(Literal->getStrData(), 1409 StringLength)); 1410 } 1411 1412 // Otherwise, convert the UTF8 literals into a byte string. 1413 llvm::SmallVector<UTF16, 128> ToBuf(NumBytes); 1414 const UTF8 *FromPtr = (UTF8 *)Literal->getStrData(); 1415 UTF16 *ToPtr = &ToBuf[0]; 1416 1417 ConversionResult Result = ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes, 1418 &ToPtr, ToPtr + NumBytes, 1419 strictConversion); 1420 1421 // Check for conversion failure. 1422 if (Result != conversionOK) { 1423 // FIXME: Have Sema::CheckObjCString() validate the UTF-8 string and remove 1424 // this duplicate code. 1425 assert(Result == sourceIllegal && "UTF-8 to UTF-16 conversion failed"); 1426 StringLength = NumBytes; 1427 return Map.GetOrCreateValue(llvm::StringRef(Literal->getStrData(), 1428 StringLength)); 1429 } 1430 1431 // ConvertUTF8toUTF16 returns the length in ToPtr. 1432 StringLength = ToPtr - &ToBuf[0]; 1433 1434 // Render the UTF-16 string into a byte array and convert to the target byte 1435 // order. 1436 // 1437 // FIXME: This isn't something we should need to do here. 1438 llvm::SmallString<128> AsBytes; 1439 AsBytes.reserve(StringLength * 2); 1440 for (unsigned i = 0; i != StringLength; ++i) { 1441 unsigned short Val = ToBuf[i]; 1442 if (TargetIsLSB) { 1443 AsBytes.push_back(Val & 0xFF); 1444 AsBytes.push_back(Val >> 8); 1445 } else { 1446 AsBytes.push_back(Val >> 8); 1447 AsBytes.push_back(Val & 0xFF); 1448 } 1449 } 1450 // Append one extra null character, the second is automatically added by our 1451 // caller. 1452 AsBytes.push_back(0); 1453 1454 IsUTF16 = true; 1455 return Map.GetOrCreateValue(llvm::StringRef(AsBytes.data(), AsBytes.size())); 1456} 1457 1458llvm::Constant * 1459CodeGenModule::GetAddrOfConstantCFString(const StringLiteral *Literal) { 1460 unsigned StringLength = 0; 1461 bool isUTF16 = false; 1462 llvm::StringMapEntry<llvm::Constant*> &Entry = 1463 GetConstantCFStringEntry(CFConstantStringMap, Literal, 1464 getTargetData().isLittleEndian(), 1465 isUTF16, StringLength); 1466 1467 if (llvm::Constant *C = Entry.getValue()) 1468 return C; 1469 1470 llvm::Constant *Zero = 1471 llvm::Constant::getNullValue(llvm::Type::getInt32Ty(VMContext)); 1472 llvm::Constant *Zeros[] = { Zero, Zero }; 1473 1474 // If we don't already have it, get __CFConstantStringClassReference. 1475 if (!CFConstantStringClassRef) { 1476 const llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy); 1477 Ty = llvm::ArrayType::get(Ty, 0); 1478 llvm::Constant *GV = CreateRuntimeVariable(Ty, 1479 "__CFConstantStringClassReference"); 1480 // Decay array -> ptr 1481 CFConstantStringClassRef = 1482 llvm::ConstantExpr::getGetElementPtr(GV, Zeros, 2); 1483 } 1484 1485 QualType CFTy = getContext().getCFConstantStringType(); 1486 1487 const llvm::StructType *STy = 1488 cast<llvm::StructType>(getTypes().ConvertType(CFTy)); 1489 1490 std::vector<llvm::Constant*> Fields(4); 1491 1492 // Class pointer. 1493 Fields[0] = CFConstantStringClassRef; 1494 1495 // Flags. 1496 const llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy); 1497 Fields[1] = isUTF16 ? llvm::ConstantInt::get(Ty, 0x07d0) : 1498 llvm::ConstantInt::get(Ty, 0x07C8); 1499 1500 // String pointer. 1501 llvm::Constant *C = llvm::ConstantArray::get(VMContext, Entry.getKey().str()); 1502 1503 llvm::GlobalValue::LinkageTypes Linkage; 1504 bool isConstant; 1505 if (isUTF16) { 1506 // FIXME: why do utf strings get "_" labels instead of "L" labels? 1507 Linkage = llvm::GlobalValue::InternalLinkage; 1508 // Note: -fwritable-strings doesn't make unicode CFStrings writable, but 1509 // does make plain ascii ones writable. 1510 isConstant = true; 1511 } else { 1512 Linkage = llvm::GlobalValue::PrivateLinkage; 1513 isConstant = !Features.WritableStrings; 1514 } 1515 1516 llvm::GlobalVariable *GV = 1517 new llvm::GlobalVariable(getModule(), C->getType(), isConstant, Linkage, C, 1518 ".str"); 1519 if (isUTF16) { 1520 CharUnits Align = getContext().getTypeAlignInChars(getContext().ShortTy); 1521 GV->setAlignment(Align.getQuantity()); 1522 } 1523 Fields[2] = llvm::ConstantExpr::getGetElementPtr(GV, Zeros, 2); 1524 1525 // String length. 1526 Ty = getTypes().ConvertType(getContext().LongTy); 1527 Fields[3] = llvm::ConstantInt::get(Ty, StringLength); 1528 1529 // The struct. 1530 C = llvm::ConstantStruct::get(STy, Fields); 1531 GV = new llvm::GlobalVariable(getModule(), C->getType(), true, 1532 llvm::GlobalVariable::PrivateLinkage, C, 1533 "_unnamed_cfstring_"); 1534 if (const char *Sect = getContext().Target.getCFStringSection()) 1535 GV->setSection(Sect); 1536 Entry.setValue(GV); 1537 1538 return GV; 1539} 1540 1541/// GetStringForStringLiteral - Return the appropriate bytes for a 1542/// string literal, properly padded to match the literal type. 1543std::string CodeGenModule::GetStringForStringLiteral(const StringLiteral *E) { 1544 const char *StrData = E->getStrData(); 1545 unsigned Len = E->getByteLength(); 1546 1547 const ConstantArrayType *CAT = 1548 getContext().getAsConstantArrayType(E->getType()); 1549 assert(CAT && "String isn't pointer or array!"); 1550 1551 // Resize the string to the right size. 1552 std::string Str(StrData, StrData+Len); 1553 uint64_t RealLen = CAT->getSize().getZExtValue(); 1554 1555 if (E->isWide()) 1556 RealLen *= getContext().Target.getWCharWidth()/8; 1557 1558 Str.resize(RealLen, '\0'); 1559 1560 return Str; 1561} 1562 1563/// GetAddrOfConstantStringFromLiteral - Return a pointer to a 1564/// constant array for the given string literal. 1565llvm::Constant * 1566CodeGenModule::GetAddrOfConstantStringFromLiteral(const StringLiteral *S) { 1567 // FIXME: This can be more efficient. 1568 // FIXME: We shouldn't need to bitcast the constant in the wide string case. 1569 llvm::Constant *C = GetAddrOfConstantString(GetStringForStringLiteral(S)); 1570 if (S->isWide()) { 1571 llvm::Type *DestTy = 1572 llvm::PointerType::getUnqual(getTypes().ConvertType(S->getType())); 1573 C = llvm::ConstantExpr::getBitCast(C, DestTy); 1574 } 1575 return C; 1576} 1577 1578/// GetAddrOfConstantStringFromObjCEncode - Return a pointer to a constant 1579/// array for the given ObjCEncodeExpr node. 1580llvm::Constant * 1581CodeGenModule::GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *E) { 1582 std::string Str; 1583 getContext().getObjCEncodingForType(E->getEncodedType(), Str); 1584 1585 return GetAddrOfConstantCString(Str); 1586} 1587 1588 1589/// GenerateWritableString -- Creates storage for a string literal. 1590static llvm::Constant *GenerateStringLiteral(const std::string &str, 1591 bool constant, 1592 CodeGenModule &CGM, 1593 const char *GlobalName) { 1594 // Create Constant for this string literal. Don't add a '\0'. 1595 llvm::Constant *C = 1596 llvm::ConstantArray::get(CGM.getLLVMContext(), str, false); 1597 1598 // Create a global variable for this string 1599 return new llvm::GlobalVariable(CGM.getModule(), C->getType(), constant, 1600 llvm::GlobalValue::PrivateLinkage, 1601 C, GlobalName); 1602} 1603 1604/// GetAddrOfConstantString - Returns a pointer to a character array 1605/// containing the literal. This contents are exactly that of the 1606/// given string, i.e. it will not be null terminated automatically; 1607/// see GetAddrOfConstantCString. Note that whether the result is 1608/// actually a pointer to an LLVM constant depends on 1609/// Feature.WriteableStrings. 1610/// 1611/// The result has pointer to array type. 1612llvm::Constant *CodeGenModule::GetAddrOfConstantString(const std::string &str, 1613 const char *GlobalName) { 1614 bool IsConstant = !Features.WritableStrings; 1615 1616 // Get the default prefix if a name wasn't specified. 1617 if (!GlobalName) 1618 GlobalName = ".str"; 1619 1620 // Don't share any string literals if strings aren't constant. 1621 if (!IsConstant) 1622 return GenerateStringLiteral(str, false, *this, GlobalName); 1623 1624 llvm::StringMapEntry<llvm::Constant *> &Entry = 1625 ConstantStringMap.GetOrCreateValue(&str[0], &str[str.length()]); 1626 1627 if (Entry.getValue()) 1628 return Entry.getValue(); 1629 1630 // Create a global variable for this. 1631 llvm::Constant *C = GenerateStringLiteral(str, true, *this, GlobalName); 1632 Entry.setValue(C); 1633 return C; 1634} 1635 1636/// GetAddrOfConstantCString - Returns a pointer to a character 1637/// array containing the literal and a terminating '\-' 1638/// character. The result has pointer to array type. 1639llvm::Constant *CodeGenModule::GetAddrOfConstantCString(const std::string &str, 1640 const char *GlobalName){ 1641 return GetAddrOfConstantString(str + '\0', GlobalName); 1642} 1643 1644/// EmitObjCPropertyImplementations - Emit information for synthesized 1645/// properties for an implementation. 1646void CodeGenModule::EmitObjCPropertyImplementations(const 1647 ObjCImplementationDecl *D) { 1648 for (ObjCImplementationDecl::propimpl_iterator 1649 i = D->propimpl_begin(), e = D->propimpl_end(); i != e; ++i) { 1650 ObjCPropertyImplDecl *PID = *i; 1651 1652 // Dynamic is just for type-checking. 1653 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) { 1654 ObjCPropertyDecl *PD = PID->getPropertyDecl(); 1655 1656 // Determine which methods need to be implemented, some may have 1657 // been overridden. Note that ::isSynthesized is not the method 1658 // we want, that just indicates if the decl came from a 1659 // property. What we want to know is if the method is defined in 1660 // this implementation. 1661 if (!D->getInstanceMethod(PD->getGetterName())) 1662 CodeGenFunction(*this).GenerateObjCGetter( 1663 const_cast<ObjCImplementationDecl *>(D), PID); 1664 if (!PD->isReadOnly() && 1665 !D->getInstanceMethod(PD->getSetterName())) 1666 CodeGenFunction(*this).GenerateObjCSetter( 1667 const_cast<ObjCImplementationDecl *>(D), PID); 1668 } 1669 } 1670} 1671 1672/// EmitNamespace - Emit all declarations in a namespace. 1673void CodeGenModule::EmitNamespace(const NamespaceDecl *ND) { 1674 for (RecordDecl::decl_iterator I = ND->decls_begin(), E = ND->decls_end(); 1675 I != E; ++I) 1676 EmitTopLevelDecl(*I); 1677} 1678 1679// EmitLinkageSpec - Emit all declarations in a linkage spec. 1680void CodeGenModule::EmitLinkageSpec(const LinkageSpecDecl *LSD) { 1681 if (LSD->getLanguage() != LinkageSpecDecl::lang_c && 1682 LSD->getLanguage() != LinkageSpecDecl::lang_cxx) { 1683 ErrorUnsupported(LSD, "linkage spec"); 1684 return; 1685 } 1686 1687 for (RecordDecl::decl_iterator I = LSD->decls_begin(), E = LSD->decls_end(); 1688 I != E; ++I) 1689 EmitTopLevelDecl(*I); 1690} 1691 1692/// EmitTopLevelDecl - Emit code for a single top level declaration. 1693void CodeGenModule::EmitTopLevelDecl(Decl *D) { 1694 // If an error has occurred, stop code generation, but continue 1695 // parsing and semantic analysis (to ensure all warnings and errors 1696 // are emitted). 1697 if (Diags.hasErrorOccurred()) 1698 return; 1699 1700 // Ignore dependent declarations. 1701 if (D->getDeclContext() && D->getDeclContext()->isDependentContext()) 1702 return; 1703 1704 switch (D->getKind()) { 1705 case Decl::CXXConversion: 1706 case Decl::CXXMethod: 1707 case Decl::Function: 1708 // Skip function templates 1709 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate()) 1710 return; 1711 1712 EmitGlobal(cast<FunctionDecl>(D)); 1713 break; 1714 1715 case Decl::Var: 1716 EmitGlobal(cast<VarDecl>(D)); 1717 break; 1718 1719 // C++ Decls 1720 case Decl::Namespace: 1721 EmitNamespace(cast<NamespaceDecl>(D)); 1722 break; 1723 // No code generation needed. 1724 case Decl::UsingShadow: 1725 case Decl::Using: 1726 case Decl::UsingDirective: 1727 case Decl::ClassTemplate: 1728 case Decl::FunctionTemplate: 1729 case Decl::NamespaceAlias: 1730 break; 1731 case Decl::CXXConstructor: 1732 // Skip function templates 1733 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate()) 1734 return; 1735 1736 EmitCXXConstructors(cast<CXXConstructorDecl>(D)); 1737 break; 1738 case Decl::CXXDestructor: 1739 EmitCXXDestructors(cast<CXXDestructorDecl>(D)); 1740 break; 1741 1742 case Decl::StaticAssert: 1743 // Nothing to do. 1744 break; 1745 1746 // Objective-C Decls 1747 1748 // Forward declarations, no (immediate) code generation. 1749 case Decl::ObjCClass: 1750 case Decl::ObjCForwardProtocol: 1751 case Decl::ObjCCategory: 1752 case Decl::ObjCInterface: 1753 break; 1754 1755 case Decl::ObjCProtocol: 1756 Runtime->GenerateProtocol(cast<ObjCProtocolDecl>(D)); 1757 break; 1758 1759 case Decl::ObjCCategoryImpl: 1760 // Categories have properties but don't support synthesize so we 1761 // can ignore them here. 1762 Runtime->GenerateCategory(cast<ObjCCategoryImplDecl>(D)); 1763 break; 1764 1765 case Decl::ObjCImplementation: { 1766 ObjCImplementationDecl *OMD = cast<ObjCImplementationDecl>(D); 1767 EmitObjCPropertyImplementations(OMD); 1768 Runtime->GenerateClass(OMD); 1769 break; 1770 } 1771 case Decl::ObjCMethod: { 1772 ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(D); 1773 // If this is not a prototype, emit the body. 1774 if (OMD->getBody()) 1775 CodeGenFunction(*this).GenerateObjCMethod(OMD); 1776 break; 1777 } 1778 case Decl::ObjCCompatibleAlias: 1779 // compatibility-alias is a directive and has no code gen. 1780 break; 1781 1782 case Decl::LinkageSpec: 1783 EmitLinkageSpec(cast<LinkageSpecDecl>(D)); 1784 break; 1785 1786 case Decl::FileScopeAsm: { 1787 FileScopeAsmDecl *AD = cast<FileScopeAsmDecl>(D); 1788 llvm::StringRef AsmString = AD->getAsmString()->getString(); 1789 1790 const std::string &S = getModule().getModuleInlineAsm(); 1791 if (S.empty()) 1792 getModule().setModuleInlineAsm(AsmString); 1793 else 1794 getModule().setModuleInlineAsm(S + '\n' + AsmString.str()); 1795 break; 1796 } 1797 1798 default: 1799 // Make sure we handled everything we should, every other kind is a 1800 // non-top-level decl. FIXME: Would be nice to have an isTopLevelDeclKind 1801 // function. Need to recode Decl::Kind to do that easily. 1802 assert(isa<TypeDecl>(D) && "Unsupported decl kind"); 1803 } 1804} 1805