CodeGenModule.cpp revision 2198ba12b73a8e6801d13f25de38031da6df46b6
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/Frontend/CompileOptions.h" 21#include "clang/AST/ASTContext.h" 22#include "clang/AST/DeclObjC.h" 23#include "clang/AST/DeclCXX.h" 24#include "clang/Basic/Builtins.h" 25#include "clang/Basic/Diagnostic.h" 26#include "clang/Basic/SourceManager.h" 27#include "clang/Basic/TargetInfo.h" 28#include "clang/Basic/ConvertUTF.h" 29#include "llvm/CallingConv.h" 30#include "llvm/Module.h" 31#include "llvm/Intrinsics.h" 32#include "llvm/Target/TargetData.h" 33using namespace clang; 34using namespace CodeGen; 35 36 37CodeGenModule::CodeGenModule(ASTContext &C, const CompileOptions &compileOpts, 38 llvm::Module &M, const llvm::TargetData &TD, 39 Diagnostic &diags) 40 : BlockModule(C, M, TD, Types, *this), Context(C), 41 Features(C.getLangOptions()), CompileOpts(compileOpts), TheModule(M), 42 TheTargetData(TD), Diags(diags), Types(C, M, TD), Runtime(0), 43 MemCpyFn(0), MemMoveFn(0), MemSetFn(0), CFConstantStringClassRef(0), 44 VMContext(M.getContext()) { 45 46 if (!Features.ObjC1) 47 Runtime = 0; 48 else if (!Features.NeXTRuntime) 49 Runtime = CreateGNUObjCRuntime(*this); 50 else if (Features.ObjCNonFragileABI) 51 Runtime = CreateMacNonFragileABIObjCRuntime(*this); 52 else 53 Runtime = CreateMacObjCRuntime(*this); 54 55 // If debug info generation is enabled, create the CGDebugInfo object. 56 DebugInfo = CompileOpts.DebugInfo ? new CGDebugInfo(this) : 0; 57} 58 59CodeGenModule::~CodeGenModule() { 60 delete Runtime; 61 delete DebugInfo; 62} 63 64void CodeGenModule::Release() { 65 // We need to call this first because it can add deferred declarations. 66 EmitCXXGlobalInitFunc(); 67 68 EmitDeferred(); 69 if (Runtime) 70 if (llvm::Function *ObjCInitFunction = Runtime->ModuleInitFunction()) 71 AddGlobalCtor(ObjCInitFunction); 72 EmitCtorList(GlobalCtors, "llvm.global_ctors"); 73 EmitCtorList(GlobalDtors, "llvm.global_dtors"); 74 EmitAnnotations(); 75 EmitLLVMUsed(); 76} 77 78/// ErrorUnsupported - Print out an error that codegen doesn't support the 79/// specified stmt yet. 80void CodeGenModule::ErrorUnsupported(const Stmt *S, const char *Type, 81 bool OmitOnError) { 82 if (OmitOnError && getDiags().hasErrorOccurred()) 83 return; 84 unsigned DiagID = getDiags().getCustomDiagID(Diagnostic::Error, 85 "cannot compile this %0 yet"); 86 std::string Msg = Type; 87 getDiags().Report(Context.getFullLoc(S->getLocStart()), DiagID) 88 << Msg << S->getSourceRange(); 89} 90 91/// ErrorUnsupported - Print out an error that codegen doesn't support the 92/// specified decl yet. 93void CodeGenModule::ErrorUnsupported(const Decl *D, const char *Type, 94 bool OmitOnError) { 95 if (OmitOnError && getDiags().hasErrorOccurred()) 96 return; 97 unsigned DiagID = getDiags().getCustomDiagID(Diagnostic::Error, 98 "cannot compile this %0 yet"); 99 std::string Msg = Type; 100 getDiags().Report(Context.getFullLoc(D->getLocation()), DiagID) << Msg; 101} 102 103LangOptions::VisibilityMode 104CodeGenModule::getDeclVisibilityMode(const Decl *D) const { 105 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 106 if (VD->getStorageClass() == VarDecl::PrivateExtern) 107 return LangOptions::Hidden; 108 109 if (const VisibilityAttr *attr = D->getAttr<VisibilityAttr>()) { 110 switch (attr->getVisibility()) { 111 default: assert(0 && "Unknown visibility!"); 112 case VisibilityAttr::DefaultVisibility: 113 return LangOptions::Default; 114 case VisibilityAttr::HiddenVisibility: 115 return LangOptions::Hidden; 116 case VisibilityAttr::ProtectedVisibility: 117 return LangOptions::Protected; 118 } 119 } 120 121 return getLangOptions().getVisibilityMode(); 122} 123 124void CodeGenModule::setGlobalVisibility(llvm::GlobalValue *GV, 125 const Decl *D) const { 126 // Internal definitions always have default visibility. 127 if (GV->hasLocalLinkage()) { 128 GV->setVisibility(llvm::GlobalValue::DefaultVisibility); 129 return; 130 } 131 132 switch (getDeclVisibilityMode(D)) { 133 default: assert(0 && "Unknown visibility!"); 134 case LangOptions::Default: 135 return GV->setVisibility(llvm::GlobalValue::DefaultVisibility); 136 case LangOptions::Hidden: 137 return GV->setVisibility(llvm::GlobalValue::HiddenVisibility); 138 case LangOptions::Protected: 139 return GV->setVisibility(llvm::GlobalValue::ProtectedVisibility); 140 } 141} 142 143const char *CodeGenModule::getMangledName(const GlobalDecl &GD) { 144 const NamedDecl *ND = GD.getDecl(); 145 146 if (const CXXConstructorDecl *D = dyn_cast<CXXConstructorDecl>(ND)) 147 return getMangledCXXCtorName(D, GD.getCtorType()); 148 if (const CXXDestructorDecl *D = dyn_cast<CXXDestructorDecl>(ND)) 149 return getMangledCXXDtorName(D, GD.getDtorType()); 150 151 return getMangledName(ND); 152} 153 154/// \brief Retrieves the mangled name for the given declaration. 155/// 156/// If the given declaration requires a mangled name, returns an 157/// const char* containing the mangled name. Otherwise, returns 158/// the unmangled name. 159/// 160const char *CodeGenModule::getMangledName(const NamedDecl *ND) { 161 // In C, functions with no attributes never need to be mangled. Fastpath them. 162 if (!getLangOptions().CPlusPlus && !ND->hasAttrs()) { 163 assert(ND->getIdentifier() && "Attempt to mangle unnamed decl."); 164 return ND->getNameAsCString(); 165 } 166 167 llvm::SmallString<256> Name; 168 llvm::raw_svector_ostream Out(Name); 169 if (!mangleName(ND, Context, Out)) { 170 assert(ND->getIdentifier() && "Attempt to mangle unnamed decl."); 171 return ND->getNameAsCString(); 172 } 173 174 Name += '\0'; 175 return UniqueMangledName(Name.begin(), Name.end()); 176} 177 178const char *CodeGenModule::UniqueMangledName(const char *NameStart, 179 const char *NameEnd) { 180 assert(*(NameEnd - 1) == '\0' && "Mangled name must be null terminated!"); 181 182 return MangledNames.GetOrCreateValue(NameStart, NameEnd).getKeyData(); 183} 184 185/// AddGlobalCtor - Add a function to the list that will be called before 186/// main() runs. 187void CodeGenModule::AddGlobalCtor(llvm::Function * Ctor, int Priority) { 188 // FIXME: Type coercion of void()* types. 189 GlobalCtors.push_back(std::make_pair(Ctor, Priority)); 190} 191 192/// AddGlobalDtor - Add a function to the list that will be called 193/// when the module is unloaded. 194void CodeGenModule::AddGlobalDtor(llvm::Function * Dtor, int Priority) { 195 // FIXME: Type coercion of void()* types. 196 GlobalDtors.push_back(std::make_pair(Dtor, Priority)); 197} 198 199void CodeGenModule::EmitCtorList(const CtorList &Fns, const char *GlobalName) { 200 // Ctor function type is void()*. 201 llvm::FunctionType* CtorFTy = 202 llvm::FunctionType::get(llvm::Type::VoidTy, 203 std::vector<const llvm::Type*>(), 204 false); 205 llvm::Type *CtorPFTy = llvm::PointerType::getUnqual(CtorFTy); 206 207 // Get the type of a ctor entry, { i32, void ()* }. 208 llvm::StructType* CtorStructTy = 209 llvm::StructType::get(VMContext, llvm::Type::Int32Ty, 210 llvm::PointerType::getUnqual(CtorFTy), NULL); 211 212 // Construct the constructor and destructor arrays. 213 std::vector<llvm::Constant*> Ctors; 214 for (CtorList::const_iterator I = Fns.begin(), E = Fns.end(); I != E; ++I) { 215 std::vector<llvm::Constant*> S; 216 S.push_back( 217 llvm::ConstantInt::get(llvm::Type::Int32Ty, I->second, false)); 218 S.push_back(llvm::ConstantExpr::getBitCast(I->first, CtorPFTy)); 219 Ctors.push_back(llvm::ConstantStruct::get(CtorStructTy, S)); 220 } 221 222 if (!Ctors.empty()) { 223 llvm::ArrayType *AT = llvm::ArrayType::get(CtorStructTy, Ctors.size()); 224 new llvm::GlobalVariable(TheModule, AT, false, 225 llvm::GlobalValue::AppendingLinkage, 226 llvm::ConstantArray::get(AT, Ctors), 227 GlobalName); 228 } 229} 230 231void CodeGenModule::EmitAnnotations() { 232 if (Annotations.empty()) 233 return; 234 235 // Create a new global variable for the ConstantStruct in the Module. 236 llvm::Constant *Array = 237 llvm::ConstantArray::get(llvm::ArrayType::get(Annotations[0]->getType(), 238 Annotations.size()), 239 Annotations); 240 llvm::GlobalValue *gv = 241 new llvm::GlobalVariable(TheModule, Array->getType(), false, 242 llvm::GlobalValue::AppendingLinkage, Array, 243 "llvm.global.annotations"); 244 gv->setSection("llvm.metadata"); 245} 246 247static CodeGenModule::GVALinkage 248GetLinkageForFunction(ASTContext &Context, const FunctionDecl *FD, 249 const LangOptions &Features) { 250 // The kind of external linkage this function will have, if it is not 251 // inline or static. 252 CodeGenModule::GVALinkage External = CodeGenModule::GVA_StrongExternal; 253 if (Context.getLangOptions().CPlusPlus && 254 (FD->getPrimaryTemplate() || FD->getInstantiatedFromMemberFunction()) && 255 !FD->isExplicitSpecialization()) 256 External = CodeGenModule::GVA_TemplateInstantiation; 257 258 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 259 // C++ member functions defined inside the class are always inline. 260 if (MD->isInline() || !MD->isOutOfLine()) 261 return CodeGenModule::GVA_CXXInline; 262 263 return External; 264 } 265 266 // "static" functions get internal linkage. 267 if (FD->getStorageClass() == FunctionDecl::Static) 268 return CodeGenModule::GVA_Internal; 269 270 if (!FD->isInline()) 271 return External; 272 273 // If the inline function explicitly has the GNU inline attribute on it, or if 274 // this is C89 mode, we use to GNU semantics. 275 if (!Features.C99 && !Features.CPlusPlus) { 276 // extern inline in GNU mode is like C99 inline. 277 if (FD->getStorageClass() == FunctionDecl::Extern) 278 return CodeGenModule::GVA_C99Inline; 279 // Normal inline is a strong symbol. 280 return CodeGenModule::GVA_StrongExternal; 281 } else if (FD->hasActiveGNUInlineAttribute(Context)) { 282 // GCC in C99 mode seems to use a different decision-making 283 // process for extern inline, which factors in previous 284 // declarations. 285 if (FD->isExternGNUInline(Context)) 286 return CodeGenModule::GVA_C99Inline; 287 // Normal inline is a strong symbol. 288 return External; 289 } 290 291 // The definition of inline changes based on the language. Note that we 292 // have already handled "static inline" above, with the GVA_Internal case. 293 if (Features.CPlusPlus) // inline and extern inline. 294 return CodeGenModule::GVA_CXXInline; 295 296 assert(Features.C99 && "Must be in C99 mode if not in C89 or C++ mode"); 297 if (FD->isC99InlineDefinition()) 298 return CodeGenModule::GVA_C99Inline; 299 300 return CodeGenModule::GVA_StrongExternal; 301} 302 303/// SetFunctionDefinitionAttributes - Set attributes for a global. 304/// 305/// FIXME: This is currently only done for aliases and functions, but not for 306/// variables (these details are set in EmitGlobalVarDefinition for variables). 307void CodeGenModule::SetFunctionDefinitionAttributes(const FunctionDecl *D, 308 llvm::GlobalValue *GV) { 309 GVALinkage Linkage = GetLinkageForFunction(getContext(), D, Features); 310 311 if (Linkage == GVA_Internal) { 312 GV->setLinkage(llvm::Function::InternalLinkage); 313 } else if (D->hasAttr<DLLExportAttr>()) { 314 GV->setLinkage(llvm::Function::DLLExportLinkage); 315 } else if (D->hasAttr<WeakAttr>()) { 316 GV->setLinkage(llvm::Function::WeakAnyLinkage); 317 } else if (Linkage == GVA_C99Inline) { 318 // In C99 mode, 'inline' functions are guaranteed to have a strong 319 // definition somewhere else, so we can use available_externally linkage. 320 GV->setLinkage(llvm::Function::AvailableExternallyLinkage); 321 } else if (Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation) { 322 // In C++, the compiler has to emit a definition in every translation unit 323 // that references the function. We should use linkonce_odr because 324 // a) if all references in this translation unit are optimized away, we 325 // don't need to codegen it. b) if the function persists, it needs to be 326 // merged with other definitions. c) C++ has the ODR, so we know the 327 // definition is dependable. 328 GV->setLinkage(llvm::Function::LinkOnceODRLinkage); 329 } else { 330 assert(Linkage == GVA_StrongExternal); 331 // Otherwise, we have strong external linkage. 332 GV->setLinkage(llvm::Function::ExternalLinkage); 333 } 334 335 SetCommonAttributes(D, GV); 336} 337 338void CodeGenModule::SetLLVMFunctionAttributes(const Decl *D, 339 const CGFunctionInfo &Info, 340 llvm::Function *F) { 341 AttributeListType AttributeList; 342 ConstructAttributeList(Info, D, AttributeList); 343 344 F->setAttributes(llvm::AttrListPtr::get(AttributeList.begin(), 345 AttributeList.size())); 346 347 // Set the appropriate calling convention for the Function. 348 if (D->hasAttr<FastCallAttr>()) 349 F->setCallingConv(llvm::CallingConv::X86_FastCall); 350 351 if (D->hasAttr<StdCallAttr>()) 352 F->setCallingConv(llvm::CallingConv::X86_StdCall); 353} 354 355void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D, 356 llvm::Function *F) { 357 if (!Features.Exceptions && !Features.ObjCNonFragileABI) 358 F->addFnAttr(llvm::Attribute::NoUnwind); 359 360 if (D->hasAttr<AlwaysInlineAttr>()) 361 F->addFnAttr(llvm::Attribute::AlwaysInline); 362 363 if (D->hasAttr<NoinlineAttr>()) 364 F->addFnAttr(llvm::Attribute::NoInline); 365} 366 367void CodeGenModule::SetCommonAttributes(const Decl *D, 368 llvm::GlobalValue *GV) { 369 setGlobalVisibility(GV, D); 370 371 if (D->hasAttr<UsedAttr>()) 372 AddUsedGlobal(GV); 373 374 if (const SectionAttr *SA = D->getAttr<SectionAttr>()) 375 GV->setSection(SA->getName()); 376} 377 378void CodeGenModule::SetInternalFunctionAttributes(const Decl *D, 379 llvm::Function *F, 380 const CGFunctionInfo &FI) { 381 SetLLVMFunctionAttributes(D, FI, F); 382 SetLLVMFunctionAttributesForDefinition(D, F); 383 384 F->setLinkage(llvm::Function::InternalLinkage); 385 386 SetCommonAttributes(D, F); 387} 388 389void CodeGenModule::SetFunctionAttributes(const FunctionDecl *FD, 390 llvm::Function *F, 391 bool IsIncompleteFunction) { 392 if (!IsIncompleteFunction) 393 SetLLVMFunctionAttributes(FD, getTypes().getFunctionInfo(FD), F); 394 395 // Only a few attributes are set on declarations; these may later be 396 // overridden by a definition. 397 398 if (FD->hasAttr<DLLImportAttr>()) { 399 F->setLinkage(llvm::Function::DLLImportLinkage); 400 } else if (FD->hasAttr<WeakAttr>() || 401 FD->hasAttr<WeakImportAttr>()) { 402 // "extern_weak" is overloaded in LLVM; we probably should have 403 // separate linkage types for this. 404 F->setLinkage(llvm::Function::ExternalWeakLinkage); 405 } else { 406 F->setLinkage(llvm::Function::ExternalLinkage); 407 } 408 409 if (const SectionAttr *SA = FD->getAttr<SectionAttr>()) 410 F->setSection(SA->getName()); 411} 412 413void CodeGenModule::AddUsedGlobal(llvm::GlobalValue *GV) { 414 assert(!GV->isDeclaration() && 415 "Only globals with definition can force usage."); 416 LLVMUsed.push_back(GV); 417} 418 419void CodeGenModule::EmitLLVMUsed() { 420 // Don't create llvm.used if there is no need. 421 if (LLVMUsed.empty()) 422 return; 423 424 llvm::Type *i8PTy = llvm::PointerType::getUnqual(llvm::Type::Int8Ty); 425 426 // Convert LLVMUsed to what ConstantArray needs. 427 std::vector<llvm::Constant*> UsedArray; 428 UsedArray.resize(LLVMUsed.size()); 429 for (unsigned i = 0, e = LLVMUsed.size(); i != e; ++i) { 430 UsedArray[i] = 431 llvm::ConstantExpr::getBitCast(cast<llvm::Constant>(&*LLVMUsed[i]), 432 i8PTy); 433 } 434 435 if (UsedArray.empty()) 436 return; 437 llvm::ArrayType *ATy = llvm::ArrayType::get(i8PTy, UsedArray.size()); 438 439 llvm::GlobalVariable *GV = 440 new llvm::GlobalVariable(getModule(), ATy, false, 441 llvm::GlobalValue::AppendingLinkage, 442 llvm::ConstantArray::get(ATy, UsedArray), 443 "llvm.used"); 444 445 GV->setSection("llvm.metadata"); 446} 447 448void CodeGenModule::EmitDeferred() { 449 // Emit code for any potentially referenced deferred decls. Since a 450 // previously unused static decl may become used during the generation of code 451 // for a static function, iterate until no changes are made. 452 while (!DeferredDeclsToEmit.empty()) { 453 GlobalDecl D = DeferredDeclsToEmit.back(); 454 DeferredDeclsToEmit.pop_back(); 455 456 // The mangled name for the decl must have been emitted in GlobalDeclMap. 457 // Look it up to see if it was defined with a stronger definition (e.g. an 458 // extern inline function with a strong function redefinition). If so, 459 // just ignore the deferred decl. 460 llvm::GlobalValue *CGRef = GlobalDeclMap[getMangledName(D)]; 461 assert(CGRef && "Deferred decl wasn't referenced?"); 462 463 if (!CGRef->isDeclaration()) 464 continue; 465 466 // Otherwise, emit the definition and move on to the next one. 467 EmitGlobalDefinition(D); 468 } 469} 470 471/// EmitAnnotateAttr - Generate the llvm::ConstantStruct which contains the 472/// annotation information for a given GlobalValue. The annotation struct is 473/// {i8 *, i8 *, i8 *, i32}. The first field is a constant expression, the 474/// GlobalValue being annotated. The second field is the constant string 475/// created from the AnnotateAttr's annotation. The third field is a constant 476/// string containing the name of the translation unit. The fourth field is 477/// the line number in the file of the annotated value declaration. 478/// 479/// FIXME: this does not unique the annotation string constants, as llvm-gcc 480/// appears to. 481/// 482llvm::Constant *CodeGenModule::EmitAnnotateAttr(llvm::GlobalValue *GV, 483 const AnnotateAttr *AA, 484 unsigned LineNo) { 485 llvm::Module *M = &getModule(); 486 487 // get [N x i8] constants for the annotation string, and the filename string 488 // which are the 2nd and 3rd elements of the global annotation structure. 489 const llvm::Type *SBP = llvm::PointerType::getUnqual(llvm::Type::Int8Ty); 490 llvm::Constant *anno = llvm::ConstantArray::get(AA->getAnnotation(), true); 491 llvm::Constant *unit = llvm::ConstantArray::get(M->getModuleIdentifier(), 492 true); 493 494 // Get the two global values corresponding to the ConstantArrays we just 495 // created to hold the bytes of the strings. 496 llvm::GlobalValue *annoGV = 497 new llvm::GlobalVariable(*M, anno->getType(), false, 498 llvm::GlobalValue::PrivateLinkage, anno, 499 GV->getName()); 500 // translation unit name string, emitted into the llvm.metadata section. 501 llvm::GlobalValue *unitGV = 502 new llvm::GlobalVariable(*M, unit->getType(), false, 503 llvm::GlobalValue::PrivateLinkage, unit, 504 ".str"); 505 506 // Create the ConstantStruct for the global annotation. 507 llvm::Constant *Fields[4] = { 508 llvm::ConstantExpr::getBitCast(GV, SBP), 509 llvm::ConstantExpr::getBitCast(annoGV, SBP), 510 llvm::ConstantExpr::getBitCast(unitGV, SBP), 511 llvm::ConstantInt::get(llvm::Type::Int32Ty, LineNo) 512 }; 513 return llvm::ConstantStruct::get(VMContext, Fields, 4, false); 514} 515 516bool CodeGenModule::MayDeferGeneration(const ValueDecl *Global) { 517 // Never defer when EmitAllDecls is specified or the decl has 518 // attribute used. 519 if (Features.EmitAllDecls || Global->hasAttr<UsedAttr>()) 520 return false; 521 522 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Global)) { 523 // Constructors and destructors should never be deferred. 524 if (FD->hasAttr<ConstructorAttr>() || 525 FD->hasAttr<DestructorAttr>()) 526 return false; 527 528 GVALinkage Linkage = GetLinkageForFunction(getContext(), FD, Features); 529 530 // static, static inline, always_inline, and extern inline functions can 531 // always be deferred. Normal inline functions can be deferred in C99/C++. 532 if (Linkage == GVA_Internal || Linkage == GVA_C99Inline || 533 Linkage == GVA_CXXInline) 534 return true; 535 return false; 536 } 537 538 const VarDecl *VD = cast<VarDecl>(Global); 539 assert(VD->isFileVarDecl() && "Invalid decl"); 540 541 return VD->getStorageClass() == VarDecl::Static; 542} 543 544void CodeGenModule::EmitGlobal(GlobalDecl GD) { 545 const ValueDecl *Global = GD.getDecl(); 546 547 // If this is an alias definition (which otherwise looks like a declaration) 548 // emit it now. 549 if (Global->hasAttr<AliasAttr>()) 550 return EmitAliasDefinition(Global); 551 552 // Ignore declarations, they will be emitted on their first use. 553 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Global)) { 554 // Forward declarations are emitted lazily on first use. 555 if (!FD->isThisDeclarationADefinition()) 556 return; 557 } else { 558 const VarDecl *VD = cast<VarDecl>(Global); 559 assert(VD->isFileVarDecl() && "Cannot emit local var decl as global."); 560 561 // In C++, if this is marked "extern", defer code generation. 562 if (getLangOptions().CPlusPlus && !VD->getInit() && 563 (VD->getStorageClass() == VarDecl::Extern || 564 VD->isExternC(getContext()))) 565 return; 566 567 // In C, if this isn't a definition, defer code generation. 568 if (!getLangOptions().CPlusPlus && !VD->getInit()) 569 return; 570 } 571 572 // Defer code generation when possible if this is a static definition, inline 573 // function etc. These we only want to emit if they are used. 574 if (MayDeferGeneration(Global)) { 575 // If the value has already been used, add it directly to the 576 // DeferredDeclsToEmit list. 577 const char *MangledName = getMangledName(GD); 578 if (GlobalDeclMap.count(MangledName)) 579 DeferredDeclsToEmit.push_back(GD); 580 else { 581 // Otherwise, remember that we saw a deferred decl with this name. The 582 // first use of the mangled name will cause it to move into 583 // DeferredDeclsToEmit. 584 DeferredDecls[MangledName] = GD; 585 } 586 return; 587 } 588 589 // Otherwise emit the definition. 590 EmitGlobalDefinition(GD); 591} 592 593void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD) { 594 const ValueDecl *D = GD.getDecl(); 595 596 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 597 EmitCXXConstructor(CD, GD.getCtorType()); 598 else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(D)) 599 EmitCXXDestructor(DD, GD.getDtorType()); 600 else if (isa<FunctionDecl>(D)) 601 EmitGlobalFunctionDefinition(GD); 602 else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 603 EmitGlobalVarDefinition(VD); 604 else { 605 assert(0 && "Invalid argument to EmitGlobalDefinition()"); 606 } 607} 608 609/// GetOrCreateLLVMFunction - If the specified mangled name is not in the 610/// module, create and return an llvm Function with the specified type. If there 611/// is something in the module with the specified name, return it potentially 612/// bitcasted to the right type. 613/// 614/// If D is non-null, it specifies a decl that correspond to this. This is used 615/// to set the attributes on the function when it is first created. 616llvm::Constant *CodeGenModule::GetOrCreateLLVMFunction(const char *MangledName, 617 const llvm::Type *Ty, 618 GlobalDecl D) { 619 // Lookup the entry, lazily creating it if necessary. 620 llvm::GlobalValue *&Entry = GlobalDeclMap[MangledName]; 621 if (Entry) { 622 if (Entry->getType()->getElementType() == Ty) 623 return Entry; 624 625 // Make sure the result is of the correct type. 626 const llvm::Type *PTy = llvm::PointerType::getUnqual(Ty); 627 return llvm::ConstantExpr::getBitCast(Entry, PTy); 628 } 629 630 // This is the first use or definition of a mangled name. If there is a 631 // deferred decl with this name, remember that we need to emit it at the end 632 // of the file. 633 llvm::DenseMap<const char*, GlobalDecl>::iterator DDI = 634 DeferredDecls.find(MangledName); 635 if (DDI != DeferredDecls.end()) { 636 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit 637 // list, and remove it from DeferredDecls (since we don't need it anymore). 638 DeferredDeclsToEmit.push_back(DDI->second); 639 DeferredDecls.erase(DDI); 640 } else if (const FunctionDecl *FD = cast_or_null<FunctionDecl>(D.getDecl())) { 641 // If this the first reference to a C++ inline function in a class, queue up 642 // the deferred function body for emission. These are not seen as 643 // top-level declarations. 644 if (FD->isThisDeclarationADefinition() && MayDeferGeneration(FD)) 645 DeferredDeclsToEmit.push_back(D); 646 // A called constructor which has no definition or declaration need be 647 // synthesized. 648 else if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) { 649 const CXXRecordDecl *ClassDecl = 650 cast<CXXRecordDecl>(CD->getDeclContext()); 651 if (CD->isCopyConstructor(getContext())) 652 DeferredCopyConstructorToEmit(D); 653 else if (!ClassDecl->hasUserDeclaredConstructor()) 654 DeferredDeclsToEmit.push_back(D); 655 } 656 else 657 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 658 if (MD->isCopyAssignment()) { 659 DeferredDeclsToEmit.push_back(D); 660 } 661 } 662 663 // This function doesn't have a complete type (for example, the return 664 // type is an incomplete struct). Use a fake type instead, and make 665 // sure not to try to set attributes. 666 bool IsIncompleteFunction = false; 667 if (!isa<llvm::FunctionType>(Ty)) { 668 Ty = llvm::FunctionType::get(llvm::Type::VoidTy, 669 std::vector<const llvm::Type*>(), false); 670 IsIncompleteFunction = true; 671 } 672 llvm::Function *F = llvm::Function::Create(cast<llvm::FunctionType>(Ty), 673 llvm::Function::ExternalLinkage, 674 "", &getModule()); 675 F->setName(MangledName); 676 if (D.getDecl()) 677 SetFunctionAttributes(cast<FunctionDecl>(D.getDecl()), F, 678 IsIncompleteFunction); 679 Entry = F; 680 return F; 681} 682 683/// Defer definition of copy constructor(s) which need be implicitly defined. 684void CodeGenModule::DeferredCopyConstructorToEmit(GlobalDecl CopyCtorDecl) { 685 const CXXConstructorDecl *CD = 686 cast<CXXConstructorDecl>(CopyCtorDecl.getDecl()); 687 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(CD->getDeclContext()); 688 if (ClassDecl->hasTrivialCopyConstructor() || 689 ClassDecl->hasUserDeclaredCopyConstructor()) 690 return; 691 692 // First make sure all direct base classes and virtual bases and non-static 693 // data mebers which need to have their copy constructors implicitly defined 694 // are defined. 12.8.p7 695 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 696 Base != ClassDecl->bases_end(); ++Base) { 697 CXXRecordDecl *BaseClassDecl 698 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 699 if (CXXConstructorDecl *BaseCopyCtor = 700 BaseClassDecl->getCopyConstructor(Context, 0)) 701 GetAddrOfCXXConstructor(BaseCopyCtor, Ctor_Complete); 702 } 703 704 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 705 FieldEnd = ClassDecl->field_end(); 706 Field != FieldEnd; ++Field) { 707 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 708 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 709 FieldType = Array->getElementType(); 710 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 711 if ((*Field)->isAnonymousStructOrUnion()) 712 continue; 713 CXXRecordDecl *FieldClassDecl 714 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 715 if (CXXConstructorDecl *FieldCopyCtor = 716 FieldClassDecl->getCopyConstructor(Context, 0)) 717 GetAddrOfCXXConstructor(FieldCopyCtor, Ctor_Complete); 718 } 719 } 720 DeferredDeclsToEmit.push_back(CopyCtorDecl); 721 722} 723 724/// GetAddrOfFunction - Return the address of the given function. If Ty is 725/// non-null, then this function will use the specified type if it has to 726/// create it (this occurs when we see a definition of the function). 727llvm::Constant *CodeGenModule::GetAddrOfFunction(GlobalDecl GD, 728 const llvm::Type *Ty) { 729 // If there was no specific requested type, just convert it now. 730 if (!Ty) 731 Ty = getTypes().ConvertType(GD.getDecl()->getType()); 732 return GetOrCreateLLVMFunction(getMangledName(GD.getDecl()), Ty, GD); 733} 734 735/// CreateRuntimeFunction - Create a new runtime function with the specified 736/// type and name. 737llvm::Constant * 738CodeGenModule::CreateRuntimeFunction(const llvm::FunctionType *FTy, 739 const char *Name) { 740 // Convert Name to be a uniqued string from the IdentifierInfo table. 741 Name = getContext().Idents.get(Name).getName(); 742 return GetOrCreateLLVMFunction(Name, FTy, GlobalDecl()); 743} 744 745/// GetOrCreateLLVMGlobal - If the specified mangled name is not in the module, 746/// create and return an llvm GlobalVariable with the specified type. If there 747/// is something in the module with the specified name, return it potentially 748/// bitcasted to the right type. 749/// 750/// If D is non-null, it specifies a decl that correspond to this. This is used 751/// to set the attributes on the global when it is first created. 752llvm::Constant *CodeGenModule::GetOrCreateLLVMGlobal(const char *MangledName, 753 const llvm::PointerType*Ty, 754 const VarDecl *D) { 755 // Lookup the entry, lazily creating it if necessary. 756 llvm::GlobalValue *&Entry = GlobalDeclMap[MangledName]; 757 if (Entry) { 758 if (Entry->getType() == Ty) 759 return Entry; 760 761 // Make sure the result is of the correct type. 762 return llvm::ConstantExpr::getBitCast(Entry, Ty); 763 } 764 765 // This is the first use or definition of a mangled name. If there is a 766 // deferred decl with this name, remember that we need to emit it at the end 767 // of the file. 768 llvm::DenseMap<const char*, GlobalDecl>::iterator DDI = 769 DeferredDecls.find(MangledName); 770 if (DDI != DeferredDecls.end()) { 771 // Move the potentially referenced deferred decl to the DeferredDeclsToEmit 772 // list, and remove it from DeferredDecls (since we don't need it anymore). 773 DeferredDeclsToEmit.push_back(DDI->second); 774 DeferredDecls.erase(DDI); 775 } 776 777 llvm::GlobalVariable *GV = 778 new llvm::GlobalVariable(getModule(), Ty->getElementType(), false, 779 llvm::GlobalValue::ExternalLinkage, 780 0, "", 0, 781 false, Ty->getAddressSpace()); 782 GV->setName(MangledName); 783 784 // Handle things which are present even on external declarations. 785 if (D) { 786 // FIXME: This code is overly simple and should be merged with other global 787 // handling. 788 GV->setConstant(D->getType().isConstant(Context)); 789 790 // FIXME: Merge with other attribute handling code. 791 if (D->getStorageClass() == VarDecl::PrivateExtern) 792 GV->setVisibility(llvm::GlobalValue::HiddenVisibility); 793 794 if (D->hasAttr<WeakAttr>() || 795 D->hasAttr<WeakImportAttr>()) 796 GV->setLinkage(llvm::GlobalValue::ExternalWeakLinkage); 797 798 GV->setThreadLocal(D->isThreadSpecified()); 799 } 800 801 return Entry = GV; 802} 803 804 805/// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the 806/// given global variable. If Ty is non-null and if the global doesn't exist, 807/// then it will be greated with the specified type instead of whatever the 808/// normal requested type would be. 809llvm::Constant *CodeGenModule::GetAddrOfGlobalVar(const VarDecl *D, 810 const llvm::Type *Ty) { 811 assert(D->hasGlobalStorage() && "Not a global variable"); 812 QualType ASTTy = D->getType(); 813 if (Ty == 0) 814 Ty = getTypes().ConvertTypeForMem(ASTTy); 815 816 const llvm::PointerType *PTy = 817 llvm::PointerType::get(Ty, ASTTy.getAddressSpace()); 818 return GetOrCreateLLVMGlobal(getMangledName(D), PTy, D); 819} 820 821/// CreateRuntimeVariable - Create a new runtime global variable with the 822/// specified type and name. 823llvm::Constant * 824CodeGenModule::CreateRuntimeVariable(const llvm::Type *Ty, 825 const char *Name) { 826 // Convert Name to be a uniqued string from the IdentifierInfo table. 827 Name = getContext().Idents.get(Name).getName(); 828 return GetOrCreateLLVMGlobal(Name, llvm::PointerType::getUnqual(Ty), 0); 829} 830 831void CodeGenModule::EmitTentativeDefinition(const VarDecl *D) { 832 assert(!D->getInit() && "Cannot emit definite definitions here!"); 833 834 if (MayDeferGeneration(D)) { 835 // If we have not seen a reference to this variable yet, place it 836 // into the deferred declarations table to be emitted if needed 837 // later. 838 const char *MangledName = getMangledName(D); 839 if (GlobalDeclMap.count(MangledName) == 0) { 840 DeferredDecls[MangledName] = GlobalDecl(D); 841 return; 842 } 843 } 844 845 // The tentative definition is the only definition. 846 EmitGlobalVarDefinition(D); 847} 848 849void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D) { 850 llvm::Constant *Init = 0; 851 QualType ASTTy = D->getType(); 852 853 if (D->getInit() == 0) { 854 // This is a tentative definition; tentative definitions are 855 // implicitly initialized with { 0 }. 856 // 857 // Note that tentative definitions are only emitted at the end of 858 // a translation unit, so they should never have incomplete 859 // type. In addition, EmitTentativeDefinition makes sure that we 860 // never attempt to emit a tentative definition if a real one 861 // exists. A use may still exists, however, so we still may need 862 // to do a RAUW. 863 assert(!ASTTy->isIncompleteType() && "Unexpected incomplete type"); 864 Init = EmitNullConstant(D->getType()); 865 } else { 866 Init = EmitConstantExpr(D->getInit(), D->getType()); 867 868 if (!Init) { 869 QualType T = D->getInit()->getType(); 870 if (getLangOptions().CPlusPlus) { 871 CXXGlobalInits.push_back(D); 872 Init = EmitNullConstant(T); 873 } else { 874 ErrorUnsupported(D, "static initializer"); 875 Init = llvm::UndefValue::get(getTypes().ConvertType(T)); 876 } 877 } 878 } 879 880 const llvm::Type* InitType = Init->getType(); 881 llvm::Constant *Entry = GetAddrOfGlobalVar(D, InitType); 882 883 // Strip off a bitcast if we got one back. 884 if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) { 885 assert(CE->getOpcode() == llvm::Instruction::BitCast || 886 // all zero index gep. 887 CE->getOpcode() == llvm::Instruction::GetElementPtr); 888 Entry = CE->getOperand(0); 889 } 890 891 // Entry is now either a Function or GlobalVariable. 892 llvm::GlobalVariable *GV = dyn_cast<llvm::GlobalVariable>(Entry); 893 894 // We have a definition after a declaration with the wrong type. 895 // We must make a new GlobalVariable* and update everything that used OldGV 896 // (a declaration or tentative definition) with the new GlobalVariable* 897 // (which will be a definition). 898 // 899 // This happens if there is a prototype for a global (e.g. 900 // "extern int x[];") and then a definition of a different type (e.g. 901 // "int x[10];"). This also happens when an initializer has a different type 902 // from the type of the global (this happens with unions). 903 if (GV == 0 || 904 GV->getType()->getElementType() != InitType || 905 GV->getType()->getAddressSpace() != ASTTy.getAddressSpace()) { 906 907 // Remove the old entry from GlobalDeclMap so that we'll create a new one. 908 GlobalDeclMap.erase(getMangledName(D)); 909 910 // Make a new global with the correct type, this is now guaranteed to work. 911 GV = cast<llvm::GlobalVariable>(GetAddrOfGlobalVar(D, InitType)); 912 GV->takeName(cast<llvm::GlobalValue>(Entry)); 913 914 // Replace all uses of the old global with the new global 915 llvm::Constant *NewPtrForOldDecl = 916 llvm::ConstantExpr::getBitCast(GV, Entry->getType()); 917 Entry->replaceAllUsesWith(NewPtrForOldDecl); 918 919 // Erase the old global, since it is no longer used. 920 cast<llvm::GlobalValue>(Entry)->eraseFromParent(); 921 } 922 923 if (const AnnotateAttr *AA = D->getAttr<AnnotateAttr>()) { 924 SourceManager &SM = Context.getSourceManager(); 925 AddAnnotation(EmitAnnotateAttr(GV, AA, 926 SM.getInstantiationLineNumber(D->getLocation()))); 927 } 928 929 GV->setInitializer(Init); 930 931 // If it is safe to mark the global 'constant', do so now. 932 GV->setConstant(false); 933 if (D->getType().isConstant(Context)) { 934 // FIXME: In C++, if the variable has a non-trivial ctor/dtor or any mutable 935 // members, it cannot be declared "LLVM const". 936 GV->setConstant(true); 937 } 938 939 GV->setAlignment(getContext().getDeclAlignInBytes(D)); 940 941 // Set the llvm linkage type as appropriate. 942 if (D->getStorageClass() == VarDecl::Static) 943 GV->setLinkage(llvm::Function::InternalLinkage); 944 else if (D->hasAttr<DLLImportAttr>()) 945 GV->setLinkage(llvm::Function::DLLImportLinkage); 946 else if (D->hasAttr<DLLExportAttr>()) 947 GV->setLinkage(llvm::Function::DLLExportLinkage); 948 else if (D->hasAttr<WeakAttr>()) { 949 if (GV->isConstant()) 950 GV->setLinkage(llvm::GlobalVariable::WeakODRLinkage); 951 else 952 GV->setLinkage(llvm::GlobalVariable::WeakAnyLinkage); 953 } else if (!CompileOpts.NoCommon && 954 !D->hasExternalStorage() && !D->getInit() && 955 !D->getAttr<SectionAttr>()) { 956 GV->setLinkage(llvm::GlobalVariable::CommonLinkage); 957 // common vars aren't constant even if declared const. 958 GV->setConstant(false); 959 } else 960 GV->setLinkage(llvm::GlobalVariable::ExternalLinkage); 961 962 SetCommonAttributes(D, GV); 963 964 // Emit global variable debug information. 965 if (CGDebugInfo *DI = getDebugInfo()) { 966 DI->setLocation(D->getLocation()); 967 DI->EmitGlobalVariable(GV, D); 968 } 969} 970 971/// ReplaceUsesOfNonProtoTypeWithRealFunction - This function is called when we 972/// implement a function with no prototype, e.g. "int foo() {}". If there are 973/// existing call uses of the old function in the module, this adjusts them to 974/// call the new function directly. 975/// 976/// This is not just a cleanup: the always_inline pass requires direct calls to 977/// functions to be able to inline them. If there is a bitcast in the way, it 978/// won't inline them. Instcombine normally deletes these calls, but it isn't 979/// run at -O0. 980static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old, 981 llvm::Function *NewFn) { 982 // If we're redefining a global as a function, don't transform it. 983 llvm::Function *OldFn = dyn_cast<llvm::Function>(Old); 984 if (OldFn == 0) return; 985 986 const llvm::Type *NewRetTy = NewFn->getReturnType(); 987 llvm::SmallVector<llvm::Value*, 4> ArgList; 988 989 for (llvm::Value::use_iterator UI = OldFn->use_begin(), E = OldFn->use_end(); 990 UI != E; ) { 991 // TODO: Do invokes ever occur in C code? If so, we should handle them too. 992 unsigned OpNo = UI.getOperandNo(); 993 llvm::CallInst *CI = dyn_cast<llvm::CallInst>(*UI++); 994 if (!CI || OpNo != 0) continue; 995 996 // If the return types don't match exactly, and if the call isn't dead, then 997 // we can't transform this call. 998 if (CI->getType() != NewRetTy && !CI->use_empty()) 999 continue; 1000 1001 // If the function was passed too few arguments, don't transform. If extra 1002 // arguments were passed, we silently drop them. If any of the types 1003 // mismatch, we don't transform. 1004 unsigned ArgNo = 0; 1005 bool DontTransform = false; 1006 for (llvm::Function::arg_iterator AI = NewFn->arg_begin(), 1007 E = NewFn->arg_end(); AI != E; ++AI, ++ArgNo) { 1008 if (CI->getNumOperands()-1 == ArgNo || 1009 CI->getOperand(ArgNo+1)->getType() != AI->getType()) { 1010 DontTransform = true; 1011 break; 1012 } 1013 } 1014 if (DontTransform) 1015 continue; 1016 1017 // Okay, we can transform this. Create the new call instruction and copy 1018 // over the required information. 1019 ArgList.append(CI->op_begin()+1, CI->op_begin()+1+ArgNo); 1020 llvm::CallInst *NewCall = llvm::CallInst::Create(NewFn, ArgList.begin(), 1021 ArgList.end(), "", CI); 1022 ArgList.clear(); 1023 if (NewCall->getType() != llvm::Type::VoidTy) 1024 NewCall->takeName(CI); 1025 NewCall->setCallingConv(CI->getCallingConv()); 1026 NewCall->setAttributes(CI->getAttributes()); 1027 1028 // Finally, remove the old call, replacing any uses with the new one. 1029 if (!CI->use_empty()) 1030 CI->replaceAllUsesWith(NewCall); 1031 CI->eraseFromParent(); 1032 } 1033} 1034 1035 1036void CodeGenModule::EmitGlobalFunctionDefinition(GlobalDecl GD) { 1037 const llvm::FunctionType *Ty; 1038 const FunctionDecl *D = cast<FunctionDecl>(GD.getDecl()); 1039 1040 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 1041 bool isVariadic = D->getType()->getAsFunctionProtoType()->isVariadic(); 1042 1043 Ty = getTypes().GetFunctionType(getTypes().getFunctionInfo(MD), isVariadic); 1044 } else { 1045 Ty = cast<llvm::FunctionType>(getTypes().ConvertType(D->getType())); 1046 1047 // As a special case, make sure that definitions of K&R function 1048 // "type foo()" aren't declared as varargs (which forces the backend 1049 // to do unnecessary work). 1050 if (D->getType()->isFunctionNoProtoType()) { 1051 assert(Ty->isVarArg() && "Didn't lower type as expected"); 1052 // Due to stret, the lowered function could have arguments. 1053 // Just create the same type as was lowered by ConvertType 1054 // but strip off the varargs bit. 1055 std::vector<const llvm::Type*> Args(Ty->param_begin(), Ty->param_end()); 1056 Ty = llvm::FunctionType::get(Ty->getReturnType(), Args, false); 1057 } 1058 } 1059 1060 // Get or create the prototype for the function. 1061 llvm::Constant *Entry = GetAddrOfFunction(GD, Ty); 1062 1063 // Strip off a bitcast if we got one back. 1064 if (llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Entry)) { 1065 assert(CE->getOpcode() == llvm::Instruction::BitCast); 1066 Entry = CE->getOperand(0); 1067 } 1068 1069 1070 if (cast<llvm::GlobalValue>(Entry)->getType()->getElementType() != Ty) { 1071 llvm::GlobalValue *OldFn = cast<llvm::GlobalValue>(Entry); 1072 1073 // If the types mismatch then we have to rewrite the definition. 1074 assert(OldFn->isDeclaration() && 1075 "Shouldn't replace non-declaration"); 1076 1077 // F is the Function* for the one with the wrong type, we must make a new 1078 // Function* and update everything that used F (a declaration) with the new 1079 // Function* (which will be a definition). 1080 // 1081 // This happens if there is a prototype for a function 1082 // (e.g. "int f()") and then a definition of a different type 1083 // (e.g. "int f(int x)"). Start by making a new function of the 1084 // correct type, RAUW, then steal the name. 1085 GlobalDeclMap.erase(getMangledName(D)); 1086 llvm::Function *NewFn = cast<llvm::Function>(GetAddrOfFunction(GD, Ty)); 1087 NewFn->takeName(OldFn); 1088 1089 // If this is an implementation of a function without a prototype, try to 1090 // replace any existing uses of the function (which may be calls) with uses 1091 // of the new function 1092 if (D->getType()->isFunctionNoProtoType()) { 1093 ReplaceUsesOfNonProtoTypeWithRealFunction(OldFn, NewFn); 1094 OldFn->removeDeadConstantUsers(); 1095 } 1096 1097 // Replace uses of F with the Function we will endow with a body. 1098 if (!Entry->use_empty()) { 1099 llvm::Constant *NewPtrForOldDecl = 1100 llvm::ConstantExpr::getBitCast(NewFn, Entry->getType()); 1101 Entry->replaceAllUsesWith(NewPtrForOldDecl); 1102 } 1103 1104 // Ok, delete the old function now, which is dead. 1105 OldFn->eraseFromParent(); 1106 1107 Entry = NewFn; 1108 } 1109 1110 llvm::Function *Fn = cast<llvm::Function>(Entry); 1111 1112 CodeGenFunction(*this).GenerateCode(D, Fn); 1113 1114 SetFunctionDefinitionAttributes(D, Fn); 1115 SetLLVMFunctionAttributesForDefinition(D, Fn); 1116 1117 if (const ConstructorAttr *CA = D->getAttr<ConstructorAttr>()) 1118 AddGlobalCtor(Fn, CA->getPriority()); 1119 if (const DestructorAttr *DA = D->getAttr<DestructorAttr>()) 1120 AddGlobalDtor(Fn, DA->getPriority()); 1121} 1122 1123void CodeGenModule::EmitAliasDefinition(const ValueDecl *D) { 1124 const AliasAttr *AA = D->getAttr<AliasAttr>(); 1125 assert(AA && "Not an alias?"); 1126 1127 const llvm::Type *DeclTy = getTypes().ConvertTypeForMem(D->getType()); 1128 1129 // Unique the name through the identifier table. 1130 const char *AliaseeName = AA->getAliasee().c_str(); 1131 AliaseeName = getContext().Idents.get(AliaseeName).getName(); 1132 1133 // Create a reference to the named value. This ensures that it is emitted 1134 // if a deferred decl. 1135 llvm::Constant *Aliasee; 1136 if (isa<llvm::FunctionType>(DeclTy)) 1137 Aliasee = GetOrCreateLLVMFunction(AliaseeName, DeclTy, GlobalDecl()); 1138 else 1139 Aliasee = GetOrCreateLLVMGlobal(AliaseeName, 1140 llvm::PointerType::getUnqual(DeclTy), 0); 1141 1142 // Create the new alias itself, but don't set a name yet. 1143 llvm::GlobalValue *GA = 1144 new llvm::GlobalAlias(Aliasee->getType(), 1145 llvm::Function::ExternalLinkage, 1146 "", Aliasee, &getModule()); 1147 1148 // See if there is already something with the alias' name in the module. 1149 const char *MangledName = getMangledName(D); 1150 llvm::GlobalValue *&Entry = GlobalDeclMap[MangledName]; 1151 1152 if (Entry && !Entry->isDeclaration()) { 1153 // If there is a definition in the module, then it wins over the alias. 1154 // This is dubious, but allow it to be safe. Just ignore the alias. 1155 GA->eraseFromParent(); 1156 return; 1157 } 1158 1159 if (Entry) { 1160 // If there is a declaration in the module, then we had an extern followed 1161 // by the alias, as in: 1162 // extern int test6(); 1163 // ... 1164 // int test6() __attribute__((alias("test7"))); 1165 // 1166 // Remove it and replace uses of it with the alias. 1167 1168 Entry->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GA, 1169 Entry->getType())); 1170 Entry->eraseFromParent(); 1171 } 1172 1173 // Now we know that there is no conflict, set the name. 1174 Entry = GA; 1175 GA->setName(MangledName); 1176 1177 // Set attributes which are particular to an alias; this is a 1178 // specialization of the attributes which may be set on a global 1179 // variable/function. 1180 if (D->hasAttr<DLLExportAttr>()) { 1181 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1182 // The dllexport attribute is ignored for undefined symbols. 1183 if (FD->getBody()) 1184 GA->setLinkage(llvm::Function::DLLExportLinkage); 1185 } else { 1186 GA->setLinkage(llvm::Function::DLLExportLinkage); 1187 } 1188 } else if (D->hasAttr<WeakAttr>() || 1189 D->hasAttr<WeakImportAttr>()) { 1190 GA->setLinkage(llvm::Function::WeakAnyLinkage); 1191 } 1192 1193 SetCommonAttributes(D, GA); 1194} 1195 1196/// getBuiltinLibFunction - Given a builtin id for a function like 1197/// "__builtin_fabsf", return a Function* for "fabsf". 1198llvm::Value *CodeGenModule::getBuiltinLibFunction(unsigned BuiltinID) { 1199 assert((Context.BuiltinInfo.isLibFunction(BuiltinID) || 1200 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) && 1201 "isn't a lib fn"); 1202 1203 // Get the name, skip over the __builtin_ prefix (if necessary). 1204 const char *Name = Context.BuiltinInfo.GetName(BuiltinID); 1205 if (Context.BuiltinInfo.isLibFunction(BuiltinID)) 1206 Name += 10; 1207 1208 // Get the type for the builtin. 1209 ASTContext::GetBuiltinTypeError Error; 1210 QualType Type = Context.GetBuiltinType(BuiltinID, Error); 1211 assert(Error == ASTContext::GE_None && "Can't get builtin type"); 1212 1213 const llvm::FunctionType *Ty = 1214 cast<llvm::FunctionType>(getTypes().ConvertType(Type)); 1215 1216 // Unique the name through the identifier table. 1217 Name = getContext().Idents.get(Name).getName(); 1218 // FIXME: param attributes for sext/zext etc. 1219 return GetOrCreateLLVMFunction(Name, Ty, GlobalDecl()); 1220} 1221 1222llvm::Function *CodeGenModule::getIntrinsic(unsigned IID,const llvm::Type **Tys, 1223 unsigned NumTys) { 1224 return llvm::Intrinsic::getDeclaration(&getModule(), 1225 (llvm::Intrinsic::ID)IID, Tys, NumTys); 1226} 1227 1228llvm::Function *CodeGenModule::getMemCpyFn() { 1229 if (MemCpyFn) return MemCpyFn; 1230 const llvm::Type *IntPtr = TheTargetData.getIntPtrType(); 1231 return MemCpyFn = getIntrinsic(llvm::Intrinsic::memcpy, &IntPtr, 1); 1232} 1233 1234llvm::Function *CodeGenModule::getMemMoveFn() { 1235 if (MemMoveFn) return MemMoveFn; 1236 const llvm::Type *IntPtr = TheTargetData.getIntPtrType(); 1237 return MemMoveFn = getIntrinsic(llvm::Intrinsic::memmove, &IntPtr, 1); 1238} 1239 1240llvm::Function *CodeGenModule::getMemSetFn() { 1241 if (MemSetFn) return MemSetFn; 1242 const llvm::Type *IntPtr = TheTargetData.getIntPtrType(); 1243 return MemSetFn = getIntrinsic(llvm::Intrinsic::memset, &IntPtr, 1); 1244} 1245 1246static void appendFieldAndPadding(CodeGenModule &CGM, 1247 std::vector<llvm::Constant*>& Fields, 1248 FieldDecl *FieldD, FieldDecl *NextFieldD, 1249 llvm::Constant* Field, 1250 RecordDecl* RD, const llvm::StructType *STy) { 1251 // Append the field. 1252 Fields.push_back(Field); 1253 1254 int StructFieldNo = CGM.getTypes().getLLVMFieldNo(FieldD); 1255 1256 int NextStructFieldNo; 1257 if (!NextFieldD) { 1258 NextStructFieldNo = STy->getNumElements(); 1259 } else { 1260 NextStructFieldNo = CGM.getTypes().getLLVMFieldNo(NextFieldD); 1261 } 1262 1263 // Append padding 1264 for (int i = StructFieldNo + 1; i < NextStructFieldNo; i++) { 1265 llvm::Constant *C = 1266 llvm::Constant::getNullValue(STy->getElementType(StructFieldNo + 1)); 1267 1268 Fields.push_back(C); 1269 } 1270} 1271 1272static llvm::StringMapEntry<llvm::Constant*> & 1273GetConstantCFStringEntry(llvm::StringMap<llvm::Constant*> &Map, 1274 const StringLiteral *Literal, 1275 bool TargetIsLSB, 1276 bool &IsUTF16, 1277 unsigned &StringLength) { 1278 unsigned NumBytes = Literal->getByteLength(); 1279 1280 // Check for simple case. 1281 if (!Literal->containsNonAsciiOrNull()) { 1282 StringLength = NumBytes; 1283 return Map.GetOrCreateValue(llvm::StringRef(Literal->getStrData(), 1284 StringLength)); 1285 } 1286 1287 // Otherwise, convert the UTF8 literals into a byte string. 1288 llvm::SmallVector<UTF16, 128> ToBuf(NumBytes); 1289 const UTF8 *FromPtr = (UTF8 *)Literal->getStrData(); 1290 UTF16 *ToPtr = &ToBuf[0]; 1291 1292 ConversionResult Result = ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes, 1293 &ToPtr, ToPtr + NumBytes, 1294 strictConversion); 1295 1296 // Check for conversion failure. 1297 if (Result != conversionOK) { 1298 // FIXME: Have Sema::CheckObjCString() validate the UTF-8 string and remove 1299 // this duplicate code. 1300 assert(Result == sourceIllegal && "UTF-8 to UTF-16 conversion failed"); 1301 StringLength = NumBytes; 1302 return Map.GetOrCreateValue(llvm::StringRef(Literal->getStrData(), 1303 StringLength)); 1304 } 1305 1306 // ConvertUTF8toUTF16 returns the length in ToPtr. 1307 StringLength = ToPtr - &ToBuf[0]; 1308 1309 // Render the UTF-16 string into a byte array and convert to the target byte 1310 // order. 1311 // 1312 // FIXME: This isn't something we should need to do here. 1313 llvm::SmallString<128> AsBytes; 1314 AsBytes.reserve(StringLength * 2); 1315 for (unsigned i = 0; i != StringLength; ++i) { 1316 unsigned short Val = ToBuf[i]; 1317 if (TargetIsLSB) { 1318 AsBytes.push_back(Val & 0xFF); 1319 AsBytes.push_back(Val >> 8); 1320 } else { 1321 AsBytes.push_back(Val >> 8); 1322 AsBytes.push_back(Val & 0xFF); 1323 } 1324 } 1325 // Append one extra null character, the second is automatically added by our 1326 // caller. 1327 AsBytes.push_back(0); 1328 1329 IsUTF16 = true; 1330 return Map.GetOrCreateValue(llvm::StringRef(AsBytes.data(), AsBytes.size())); 1331} 1332 1333llvm::Constant * 1334CodeGenModule::GetAddrOfConstantCFString(const StringLiteral *Literal) { 1335 unsigned StringLength = 0; 1336 bool isUTF16 = false; 1337 llvm::StringMapEntry<llvm::Constant*> &Entry = 1338 GetConstantCFStringEntry(CFConstantStringMap, Literal, 1339 getTargetData().isLittleEndian(), 1340 isUTF16, StringLength); 1341 1342 if (llvm::Constant *C = Entry.getValue()) 1343 return C; 1344 1345 llvm::Constant *Zero = llvm::Constant::getNullValue(llvm::Type::Int32Ty); 1346 llvm::Constant *Zeros[] = { Zero, Zero }; 1347 1348 // If we don't already have it, get __CFConstantStringClassReference. 1349 if (!CFConstantStringClassRef) { 1350 const llvm::Type *Ty = getTypes().ConvertType(getContext().IntTy); 1351 Ty = llvm::ArrayType::get(Ty, 0); 1352 llvm::Constant *GV = CreateRuntimeVariable(Ty, 1353 "__CFConstantStringClassReference"); 1354 // Decay array -> ptr 1355 CFConstantStringClassRef = 1356 llvm::ConstantExpr::getGetElementPtr(GV, Zeros, 2); 1357 } 1358 1359 QualType CFTy = getContext().getCFConstantStringType(); 1360 RecordDecl *CFRD = CFTy->getAs<RecordType>()->getDecl(); 1361 1362 const llvm::StructType *STy = 1363 cast<llvm::StructType>(getTypes().ConvertType(CFTy)); 1364 1365 std::vector<llvm::Constant*> Fields; 1366 RecordDecl::field_iterator Field = CFRD->field_begin(); 1367 1368 // Class pointer. 1369 FieldDecl *CurField = *Field++; 1370 FieldDecl *NextField = *Field++; 1371 appendFieldAndPadding(*this, Fields, CurField, NextField, 1372 CFConstantStringClassRef, CFRD, STy); 1373 1374 // Flags. 1375 CurField = NextField; 1376 NextField = *Field++; 1377 const llvm::Type *Ty = getTypes().ConvertType(getContext().UnsignedIntTy); 1378 appendFieldAndPadding(*this, Fields, CurField, NextField, 1379 isUTF16 ? llvm::ConstantInt::get(Ty, 0x07d0) 1380 : llvm::ConstantInt::get(Ty, 0x07C8), 1381 CFRD, STy); 1382 1383 // String pointer. 1384 CurField = NextField; 1385 NextField = *Field++; 1386 llvm::Constant *C = llvm::ConstantArray::get(Entry.getKey().str()); 1387 1388 const char *Sect, *Prefix; 1389 bool isConstant; 1390 llvm::GlobalValue::LinkageTypes Linkage; 1391 if (isUTF16) { 1392 Prefix = getContext().Target.getUnicodeStringSymbolPrefix(); 1393 Sect = getContext().Target.getUnicodeStringSection(); 1394 // FIXME: why do utf strings get "l" labels instead of "L" labels? 1395 Linkage = llvm::GlobalValue::InternalLinkage; 1396 // FIXME: Why does GCC not set constant here? 1397 isConstant = false; 1398 } else { 1399 Prefix = ".str"; 1400 Sect = getContext().Target.getCFStringDataSection(); 1401 Linkage = llvm::GlobalValue::PrivateLinkage; 1402 // FIXME: -fwritable-strings should probably affect this, but we 1403 // are following gcc here. 1404 isConstant = true; 1405 } 1406 llvm::GlobalVariable *GV = 1407 new llvm::GlobalVariable(getModule(), C->getType(), isConstant, 1408 Linkage, C, Prefix); 1409 if (Sect) 1410 GV->setSection(Sect); 1411 if (isUTF16) { 1412 unsigned Align = getContext().getTypeAlign(getContext().ShortTy)/8; 1413 GV->setAlignment(Align); 1414 } 1415 appendFieldAndPadding(*this, Fields, CurField, NextField, 1416 llvm::ConstantExpr::getGetElementPtr(GV, Zeros, 2), 1417 CFRD, STy); 1418 1419 // String length. 1420 CurField = NextField; 1421 NextField = 0; 1422 Ty = getTypes().ConvertType(getContext().LongTy); 1423 appendFieldAndPadding(*this, Fields, CurField, NextField, 1424 llvm::ConstantInt::get(Ty, StringLength), CFRD, STy); 1425 1426 // The struct. 1427 C = llvm::ConstantStruct::get(STy, Fields); 1428 GV = new llvm::GlobalVariable(getModule(), C->getType(), true, 1429 llvm::GlobalVariable::PrivateLinkage, C, 1430 "_unnamed_cfstring_"); 1431 if (const char *Sect = getContext().Target.getCFStringSection()) 1432 GV->setSection(Sect); 1433 Entry.setValue(GV); 1434 1435 return GV; 1436} 1437 1438/// GetStringForStringLiteral - Return the appropriate bytes for a 1439/// string literal, properly padded to match the literal type. 1440std::string CodeGenModule::GetStringForStringLiteral(const StringLiteral *E) { 1441 const char *StrData = E->getStrData(); 1442 unsigned Len = E->getByteLength(); 1443 1444 const ConstantArrayType *CAT = 1445 getContext().getAsConstantArrayType(E->getType()); 1446 assert(CAT && "String isn't pointer or array!"); 1447 1448 // Resize the string to the right size. 1449 std::string Str(StrData, StrData+Len); 1450 uint64_t RealLen = CAT->getSize().getZExtValue(); 1451 1452 if (E->isWide()) 1453 RealLen *= getContext().Target.getWCharWidth()/8; 1454 1455 Str.resize(RealLen, '\0'); 1456 1457 return Str; 1458} 1459 1460/// GetAddrOfConstantStringFromLiteral - Return a pointer to a 1461/// constant array for the given string literal. 1462llvm::Constant * 1463CodeGenModule::GetAddrOfConstantStringFromLiteral(const StringLiteral *S) { 1464 // FIXME: This can be more efficient. 1465 return GetAddrOfConstantString(GetStringForStringLiteral(S)); 1466} 1467 1468/// GetAddrOfConstantStringFromObjCEncode - Return a pointer to a constant 1469/// array for the given ObjCEncodeExpr node. 1470llvm::Constant * 1471CodeGenModule::GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *E) { 1472 std::string Str; 1473 getContext().getObjCEncodingForType(E->getEncodedType(), Str); 1474 1475 return GetAddrOfConstantCString(Str); 1476} 1477 1478 1479/// GenerateWritableString -- Creates storage for a string literal. 1480static llvm::Constant *GenerateStringLiteral(const std::string &str, 1481 bool constant, 1482 CodeGenModule &CGM, 1483 const char *GlobalName) { 1484 // Create Constant for this string literal. Don't add a '\0'. 1485 llvm::Constant *C = llvm::ConstantArray::get(str, false); 1486 1487 // Create a global variable for this string 1488 return new llvm::GlobalVariable(CGM.getModule(), C->getType(), constant, 1489 llvm::GlobalValue::PrivateLinkage, 1490 C, GlobalName); 1491} 1492 1493/// GetAddrOfConstantString - Returns a pointer to a character array 1494/// containing the literal. This contents are exactly that of the 1495/// given string, i.e. it will not be null terminated automatically; 1496/// see GetAddrOfConstantCString. Note that whether the result is 1497/// actually a pointer to an LLVM constant depends on 1498/// Feature.WriteableStrings. 1499/// 1500/// The result has pointer to array type. 1501llvm::Constant *CodeGenModule::GetAddrOfConstantString(const std::string &str, 1502 const char *GlobalName) { 1503 bool IsConstant = !Features.WritableStrings; 1504 1505 // Get the default prefix if a name wasn't specified. 1506 if (!GlobalName) 1507 GlobalName = ".str"; 1508 1509 // Don't share any string literals if strings aren't constant. 1510 if (!IsConstant) 1511 return GenerateStringLiteral(str, false, *this, GlobalName); 1512 1513 llvm::StringMapEntry<llvm::Constant *> &Entry = 1514 ConstantStringMap.GetOrCreateValue(&str[0], &str[str.length()]); 1515 1516 if (Entry.getValue()) 1517 return Entry.getValue(); 1518 1519 // Create a global variable for this. 1520 llvm::Constant *C = GenerateStringLiteral(str, true, *this, GlobalName); 1521 Entry.setValue(C); 1522 return C; 1523} 1524 1525/// GetAddrOfConstantCString - Returns a pointer to a character 1526/// array containing the literal and a terminating '\-' 1527/// character. The result has pointer to array type. 1528llvm::Constant *CodeGenModule::GetAddrOfConstantCString(const std::string &str, 1529 const char *GlobalName){ 1530 return GetAddrOfConstantString(str + '\0', GlobalName); 1531} 1532 1533/// EmitObjCPropertyImplementations - Emit information for synthesized 1534/// properties for an implementation. 1535void CodeGenModule::EmitObjCPropertyImplementations(const 1536 ObjCImplementationDecl *D) { 1537 for (ObjCImplementationDecl::propimpl_iterator 1538 i = D->propimpl_begin(), e = D->propimpl_end(); i != e; ++i) { 1539 ObjCPropertyImplDecl *PID = *i; 1540 1541 // Dynamic is just for type-checking. 1542 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) { 1543 ObjCPropertyDecl *PD = PID->getPropertyDecl(); 1544 1545 // Determine which methods need to be implemented, some may have 1546 // been overridden. Note that ::isSynthesized is not the method 1547 // we want, that just indicates if the decl came from a 1548 // property. What we want to know is if the method is defined in 1549 // this implementation. 1550 if (!D->getInstanceMethod(PD->getGetterName())) 1551 CodeGenFunction(*this).GenerateObjCGetter( 1552 const_cast<ObjCImplementationDecl *>(D), PID); 1553 if (!PD->isReadOnly() && 1554 !D->getInstanceMethod(PD->getSetterName())) 1555 CodeGenFunction(*this).GenerateObjCSetter( 1556 const_cast<ObjCImplementationDecl *>(D), PID); 1557 } 1558 } 1559} 1560 1561/// EmitNamespace - Emit all declarations in a namespace. 1562void CodeGenModule::EmitNamespace(const NamespaceDecl *ND) { 1563 for (RecordDecl::decl_iterator I = ND->decls_begin(), E = ND->decls_end(); 1564 I != E; ++I) 1565 EmitTopLevelDecl(*I); 1566} 1567 1568// EmitLinkageSpec - Emit all declarations in a linkage spec. 1569void CodeGenModule::EmitLinkageSpec(const LinkageSpecDecl *LSD) { 1570 if (LSD->getLanguage() != LinkageSpecDecl::lang_c && 1571 LSD->getLanguage() != LinkageSpecDecl::lang_cxx) { 1572 ErrorUnsupported(LSD, "linkage spec"); 1573 return; 1574 } 1575 1576 for (RecordDecl::decl_iterator I = LSD->decls_begin(), E = LSD->decls_end(); 1577 I != E; ++I) 1578 EmitTopLevelDecl(*I); 1579} 1580 1581/// EmitTopLevelDecl - Emit code for a single top level declaration. 1582void CodeGenModule::EmitTopLevelDecl(Decl *D) { 1583 // If an error has occurred, stop code generation, but continue 1584 // parsing and semantic analysis (to ensure all warnings and errors 1585 // are emitted). 1586 if (Diags.hasErrorOccurred()) 1587 return; 1588 1589 // Ignore dependent declarations. 1590 if (D->getDeclContext() && D->getDeclContext()->isDependentContext()) 1591 return; 1592 1593 switch (D->getKind()) { 1594 case Decl::CXXMethod: 1595 case Decl::Function: 1596 // Skip function templates 1597 if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate()) 1598 return; 1599 1600 // Fall through 1601 1602 case Decl::Var: 1603 EmitGlobal(GlobalDecl(cast<ValueDecl>(D))); 1604 break; 1605 1606 // C++ Decls 1607 case Decl::Namespace: 1608 EmitNamespace(cast<NamespaceDecl>(D)); 1609 break; 1610 // No code generation needed. 1611 case Decl::Using: 1612 case Decl::ClassTemplate: 1613 case Decl::FunctionTemplate: 1614 break; 1615 case Decl::CXXConstructor: 1616 EmitCXXConstructors(cast<CXXConstructorDecl>(D)); 1617 break; 1618 case Decl::CXXDestructor: 1619 EmitCXXDestructors(cast<CXXDestructorDecl>(D)); 1620 break; 1621 1622 case Decl::StaticAssert: 1623 // Nothing to do. 1624 break; 1625 1626 // Objective-C Decls 1627 1628 // Forward declarations, no (immediate) code generation. 1629 case Decl::ObjCClass: 1630 case Decl::ObjCForwardProtocol: 1631 case Decl::ObjCCategory: 1632 case Decl::ObjCInterface: 1633 break; 1634 1635 case Decl::ObjCProtocol: 1636 Runtime->GenerateProtocol(cast<ObjCProtocolDecl>(D)); 1637 break; 1638 1639 case Decl::ObjCCategoryImpl: 1640 // Categories have properties but don't support synthesize so we 1641 // can ignore them here. 1642 Runtime->GenerateCategory(cast<ObjCCategoryImplDecl>(D)); 1643 break; 1644 1645 case Decl::ObjCImplementation: { 1646 ObjCImplementationDecl *OMD = cast<ObjCImplementationDecl>(D); 1647 EmitObjCPropertyImplementations(OMD); 1648 Runtime->GenerateClass(OMD); 1649 break; 1650 } 1651 case Decl::ObjCMethod: { 1652 ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(D); 1653 // If this is not a prototype, emit the body. 1654 if (OMD->getBody()) 1655 CodeGenFunction(*this).GenerateObjCMethod(OMD); 1656 break; 1657 } 1658 case Decl::ObjCCompatibleAlias: 1659 // compatibility-alias is a directive and has no code gen. 1660 break; 1661 1662 case Decl::LinkageSpec: 1663 EmitLinkageSpec(cast<LinkageSpecDecl>(D)); 1664 break; 1665 1666 case Decl::FileScopeAsm: { 1667 FileScopeAsmDecl *AD = cast<FileScopeAsmDecl>(D); 1668 std::string AsmString(AD->getAsmString()->getStrData(), 1669 AD->getAsmString()->getByteLength()); 1670 1671 const std::string &S = getModule().getModuleInlineAsm(); 1672 if (S.empty()) 1673 getModule().setModuleInlineAsm(AsmString); 1674 else 1675 getModule().setModuleInlineAsm(S + '\n' + AsmString); 1676 break; 1677 } 1678 1679 default: 1680 // Make sure we handled everything we should, every other kind is a 1681 // non-top-level decl. FIXME: Would be nice to have an isTopLevelDeclKind 1682 // function. Need to recode Decl::Kind to do that easily. 1683 assert(isa<TypeDecl>(D) && "Unsupported decl kind"); 1684 } 1685} 1686