CGObjCMac.cpp revision fa1f756f88f4e6f3da2673082fdc1e8f54bccd6f
1//===------- CGObjCMac.cpp - Interface to Apple Objective-C Runtime -------===// 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 provides Objective-C code generation targetting the Apple runtime. 11// 12//===----------------------------------------------------------------------===// 13 14#include "CGObjCRuntime.h" 15 16#include "CodeGenModule.h" 17#include "CodeGenFunction.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/Decl.h" 20#include "clang/AST/DeclObjC.h" 21#include "clang/Basic/LangOptions.h" 22 23#include "llvm/Module.h" 24#include "llvm/ADT/DenseSet.h" 25#include "llvm/Target/TargetData.h" 26#include <sstream> 27 28using namespace clang; 29using namespace CodeGen; 30 31namespace { 32 33 typedef std::vector<llvm::Constant*> ConstantVector; 34 35 // FIXME: We should find a nicer way to make the labels for 36 // metadata, string concatenation is lame. 37 38class ObjCCommonTypesHelper { 39protected: 40 CodeGen::CodeGenModule &CGM; 41 42public: 43 const llvm::Type *ShortTy, *IntTy, *LongTy; 44 const llvm::Type *Int8PtrTy; 45 46 /// ObjectPtrTy - LLVM type for object handles (typeof(id)) 47 const llvm::Type *ObjectPtrTy; 48 49 /// PtrObjectPtrTy - LLVM type for id * 50 const llvm::Type *PtrObjectPtrTy; 51 52 /// SelectorPtrTy - LLVM type for selector handles (typeof(SEL)) 53 const llvm::Type *SelectorPtrTy; 54 /// ProtocolPtrTy - LLVM type for external protocol handles 55 /// (typeof(Protocol)) 56 const llvm::Type *ExternalProtocolPtrTy; 57 58 // SuperCTy - clang type for struct objc_super. 59 QualType SuperCTy; 60 // SuperPtrCTy - clang type for struct objc_super *. 61 QualType SuperPtrCTy; 62 63 /// SuperTy - LLVM type for struct objc_super. 64 const llvm::StructType *SuperTy; 65 /// SuperPtrTy - LLVM type for struct objc_super *. 66 const llvm::Type *SuperPtrTy; 67 68 /// PropertyTy - LLVM type for struct objc_property (struct _prop_t 69 /// in GCC parlance). 70 const llvm::StructType *PropertyTy; 71 72 /// PropertyListTy - LLVM type for struct objc_property_list 73 /// (_prop_list_t in GCC parlance). 74 const llvm::StructType *PropertyListTy; 75 /// PropertyListPtrTy - LLVM type for struct objc_property_list*. 76 const llvm::Type *PropertyListPtrTy; 77 78 // MethodTy - LLVM type for struct objc_method. 79 const llvm::StructType *MethodTy; 80 81 /// CacheTy - LLVM type for struct objc_cache. 82 const llvm::Type *CacheTy; 83 /// CachePtrTy - LLVM type for struct objc_cache *. 84 const llvm::Type *CachePtrTy; 85 86 llvm::Function *GetPropertyFn, *SetPropertyFn; 87 88 llvm::Function *EnumerationMutationFn; 89 90 /// GcReadWeakFn -- LLVM objc_read_weak (id *src) function. 91 llvm::Function *GcReadWeakFn; 92 93 /// GcAssignWeakFn -- LLVM objc_assign_weak function. 94 llvm::Function *GcAssignWeakFn; 95 96 /// GcAssignGlobalFn -- LLVM objc_assign_global function. 97 llvm::Function *GcAssignGlobalFn; 98 99 /// GcAssignIvarFn -- LLVM objc_assign_ivar function. 100 llvm::Function *GcAssignIvarFn; 101 102 /// GcAssignStrongCastFn -- LLVM objc_assign_strongCast function. 103 llvm::Function *GcAssignStrongCastFn; 104 105 ObjCCommonTypesHelper(CodeGen::CodeGenModule &cgm); 106 ~ObjCCommonTypesHelper(){} 107}; 108 109/// ObjCTypesHelper - Helper class that encapsulates lazy 110/// construction of varies types used during ObjC generation. 111class ObjCTypesHelper : public ObjCCommonTypesHelper { 112private: 113 114 llvm::Function *MessageSendFn, *MessageSendStretFn, *MessageSendFpretFn; 115 llvm::Function *MessageSendSuperFn, *MessageSendSuperStretFn, 116 *MessageSendSuperFpretFn; 117 118public: 119 /// SymtabTy - LLVM type for struct objc_symtab. 120 const llvm::StructType *SymtabTy; 121 /// SymtabPtrTy - LLVM type for struct objc_symtab *. 122 const llvm::Type *SymtabPtrTy; 123 /// ModuleTy - LLVM type for struct objc_module. 124 const llvm::StructType *ModuleTy; 125 126 /// ProtocolTy - LLVM type for struct objc_protocol. 127 const llvm::StructType *ProtocolTy; 128 /// ProtocolPtrTy - LLVM type for struct objc_protocol *. 129 const llvm::Type *ProtocolPtrTy; 130 /// ProtocolExtensionTy - LLVM type for struct 131 /// objc_protocol_extension. 132 const llvm::StructType *ProtocolExtensionTy; 133 /// ProtocolExtensionTy - LLVM type for struct 134 /// objc_protocol_extension *. 135 const llvm::Type *ProtocolExtensionPtrTy; 136 /// MethodDescriptionTy - LLVM type for struct 137 /// objc_method_description. 138 const llvm::StructType *MethodDescriptionTy; 139 /// MethodDescriptionListTy - LLVM type for struct 140 /// objc_method_description_list. 141 const llvm::StructType *MethodDescriptionListTy; 142 /// MethodDescriptionListPtrTy - LLVM type for struct 143 /// objc_method_description_list *. 144 const llvm::Type *MethodDescriptionListPtrTy; 145 /// ProtocolListTy - LLVM type for struct objc_property_list. 146 const llvm::Type *ProtocolListTy; 147 /// ProtocolListPtrTy - LLVM type for struct objc_property_list*. 148 const llvm::Type *ProtocolListPtrTy; 149 /// CategoryTy - LLVM type for struct objc_category. 150 const llvm::StructType *CategoryTy; 151 /// ClassTy - LLVM type for struct objc_class. 152 const llvm::StructType *ClassTy; 153 /// ClassPtrTy - LLVM type for struct objc_class *. 154 const llvm::Type *ClassPtrTy; 155 /// ClassExtensionTy - LLVM type for struct objc_class_ext. 156 const llvm::StructType *ClassExtensionTy; 157 /// ClassExtensionPtrTy - LLVM type for struct objc_class_ext *. 158 const llvm::Type *ClassExtensionPtrTy; 159 // IvarTy - LLVM type for struct objc_ivar. 160 const llvm::StructType *IvarTy; 161 /// IvarListTy - LLVM type for struct objc_ivar_list. 162 const llvm::Type *IvarListTy; 163 /// IvarListPtrTy - LLVM type for struct objc_ivar_list *. 164 const llvm::Type *IvarListPtrTy; 165 /// MethodListTy - LLVM type for struct objc_method_list. 166 const llvm::Type *MethodListTy; 167 /// MethodListPtrTy - LLVM type for struct objc_method_list *. 168 const llvm::Type *MethodListPtrTy; 169 170 /// ExceptionDataTy - LLVM type for struct _objc_exception_data. 171 const llvm::Type *ExceptionDataTy; 172 173 /// ExceptionThrowFn - LLVM objc_exception_throw function. 174 llvm::Function *ExceptionThrowFn; 175 176 /// ExceptionTryEnterFn - LLVM objc_exception_try_enter function. 177 llvm::Function *ExceptionTryEnterFn; 178 179 /// ExceptionTryExitFn - LLVM objc_exception_try_exit function. 180 llvm::Function *ExceptionTryExitFn; 181 182 /// ExceptionExtractFn - LLVM objc_exception_extract function. 183 llvm::Function *ExceptionExtractFn; 184 185 /// ExceptionMatchFn - LLVM objc_exception_match function. 186 llvm::Function *ExceptionMatchFn; 187 188 /// SetJmpFn - LLVM _setjmp function. 189 llvm::Function *SetJmpFn; 190 191 /// SyncEnterFn - LLVM object_sync_enter function. 192 llvm::Function *SyncEnterFn; 193 194 /// SyncExitFn - LLVM object_sync_exit function. 195 llvm::Function *SyncExitFn; 196 197public: 198 ObjCTypesHelper(CodeGen::CodeGenModule &cgm); 199 ~ObjCTypesHelper() {} 200 201 202 llvm::Function *getSendFn(bool IsSuper) { 203 return IsSuper ? MessageSendSuperFn : MessageSendFn; 204 } 205 206 llvm::Function *getSendStretFn(bool IsSuper) { 207 return IsSuper ? MessageSendSuperStretFn : MessageSendStretFn; 208 } 209 210 llvm::Function *getSendFpretFn(bool IsSuper) { 211 return IsSuper ? MessageSendSuperFpretFn : MessageSendFpretFn; 212 } 213}; 214 215/// ObjCNonFragileABITypesHelper - will have all types needed by objective-c's 216/// modern abi 217class ObjCNonFragileABITypesHelper : public ObjCCommonTypesHelper { 218public: 219 llvm::Function *MessageSendFixupFn, *MessageSendFpretFixupFn, 220 *MessageSendStretFixupFn, *MessageSendIdFixupFn, 221 *MessageSendIdStretFixupFn, *MessageSendSuper2FixupFn, 222 *MessageSendSuper2StretFixupFn; 223 224 // MethodListnfABITy - LLVM for struct _method_list_t 225 const llvm::StructType *MethodListnfABITy; 226 227 // MethodListnfABIPtrTy - LLVM for struct _method_list_t* 228 const llvm::Type *MethodListnfABIPtrTy; 229 230 // ProtocolnfABITy = LLVM for struct _protocol_t 231 const llvm::StructType *ProtocolnfABITy; 232 233 // ProtocolListnfABITy - LLVM for struct _objc_protocol_list 234 const llvm::StructType *ProtocolListnfABITy; 235 236 // ProtocolListnfABIPtrTy - LLVM for struct _objc_protocol_list* 237 const llvm::Type *ProtocolListnfABIPtrTy; 238 239 // ClassnfABITy - LLVM for struct _class_t 240 const llvm::StructType *ClassnfABITy; 241 242 // ClassnfABIPtrTy - LLVM for struct _class_t* 243 const llvm::Type *ClassnfABIPtrTy; 244 245 // IvarnfABITy - LLVM for struct _ivar_t 246 const llvm::StructType *IvarnfABITy; 247 248 // IvarListnfABITy - LLVM for struct _ivar_list_t 249 const llvm::StructType *IvarListnfABITy; 250 251 // IvarListnfABIPtrTy = LLVM for struct _ivar_list_t* 252 const llvm::Type *IvarListnfABIPtrTy; 253 254 // ClassRonfABITy - LLVM for struct _class_ro_t 255 const llvm::StructType *ClassRonfABITy; 256 257 // ImpnfABITy - LLVM for id (*)(id, SEL, ...) 258 const llvm::Type *ImpnfABITy; 259 260 // CategorynfABITy - LLVM for struct _category_t 261 const llvm::StructType *CategorynfABITy; 262 263 // New types for nonfragile abi messaging. 264 265 // MessageRefTy - LLVM for: 266 // struct _message_ref_t { 267 // IMP messenger; 268 // SEL name; 269 // }; 270 const llvm::StructType *MessageRefTy; 271 // MessageRefCTy - clang type for struct _message_ref_t 272 QualType MessageRefCTy; 273 274 // MessageRefPtrTy - LLVM for struct _message_ref_t* 275 const llvm::Type *MessageRefPtrTy; 276 // MessageRefCPtrTy - clang type for struct _message_ref_t* 277 QualType MessageRefCPtrTy; 278 279 // MessengerTy - Type of the messenger (shown as IMP above) 280 const llvm::FunctionType *MessengerTy; 281 282 // SuperMessageRefTy - LLVM for: 283 // struct _super_message_ref_t { 284 // SUPER_IMP messenger; 285 // SEL name; 286 // }; 287 const llvm::StructType *SuperMessageRefTy; 288 289 // SuperMessageRefPtrTy - LLVM for struct _super_message_ref_t* 290 const llvm::Type *SuperMessageRefPtrTy; 291 292 ObjCNonFragileABITypesHelper(CodeGen::CodeGenModule &cgm); 293 ~ObjCNonFragileABITypesHelper(){} 294}; 295 296class CGObjCCommonMac : public CodeGen::CGObjCRuntime { 297protected: 298 CodeGen::CodeGenModule &CGM; 299 // FIXME! May not be needing this after all. 300 unsigned ObjCABI; 301 302 /// LazySymbols - Symbols to generate a lazy reference for. See 303 /// DefinedSymbols and FinishModule(). 304 std::set<IdentifierInfo*> LazySymbols; 305 306 /// DefinedSymbols - External symbols which are defined by this 307 /// module. The symbols in this list and LazySymbols are used to add 308 /// special linker symbols which ensure that Objective-C modules are 309 /// linked properly. 310 std::set<IdentifierInfo*> DefinedSymbols; 311 312 /// ClassNames - uniqued class names. 313 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> ClassNames; 314 315 /// MethodVarNames - uniqued method variable names. 316 llvm::DenseMap<Selector, llvm::GlobalVariable*> MethodVarNames; 317 318 /// MethodVarTypes - uniqued method type signatures. We have to use 319 /// a StringMap here because have no other unique reference. 320 llvm::StringMap<llvm::GlobalVariable*> MethodVarTypes; 321 322 /// MethodDefinitions - map of methods which have been defined in 323 /// this translation unit. 324 llvm::DenseMap<const ObjCMethodDecl*, llvm::Function*> MethodDefinitions; 325 326 /// PropertyNames - uniqued method variable names. 327 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> PropertyNames; 328 329 /// ClassReferences - uniqued class references. 330 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> ClassReferences; 331 332 /// SelectorReferences - uniqued selector references. 333 llvm::DenseMap<Selector, llvm::GlobalVariable*> SelectorReferences; 334 335 /// Protocols - Protocols for which an objc_protocol structure has 336 /// been emitted. Forward declarations are handled by creating an 337 /// empty structure whose initializer is filled in when/if defined. 338 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> Protocols; 339 340 /// DefinedProtocols - Protocols which have actually been 341 /// defined. We should not need this, see FIXME in GenerateProtocol. 342 llvm::DenseSet<IdentifierInfo*> DefinedProtocols; 343 344 /// DefinedClasses - List of defined classes. 345 std::vector<llvm::GlobalValue*> DefinedClasses; 346 347 /// DefinedCategories - List of defined categories. 348 std::vector<llvm::GlobalValue*> DefinedCategories; 349 350 /// UsedGlobals - List of globals to pack into the llvm.used metadata 351 /// to prevent them from being clobbered. 352 std::vector<llvm::GlobalVariable*> UsedGlobals; 353 354 /// GetNameForMethod - Return a name for the given method. 355 /// \param[out] NameOut - The return value. 356 void GetNameForMethod(const ObjCMethodDecl *OMD, 357 const ObjCContainerDecl *CD, 358 std::string &NameOut); 359 360 /// GetMethodVarName - Return a unique constant for the given 361 /// selector's name. The return value has type char *. 362 llvm::Constant *GetMethodVarName(Selector Sel); 363 llvm::Constant *GetMethodVarName(IdentifierInfo *Ident); 364 llvm::Constant *GetMethodVarName(const std::string &Name); 365 366 /// GetMethodVarType - Return a unique constant for the given 367 /// selector's name. The return value has type char *. 368 369 // FIXME: This is a horrible name. 370 llvm::Constant *GetMethodVarType(const ObjCMethodDecl *D); 371 llvm::Constant *GetMethodVarType(const std::string &Name); 372 373 /// GetPropertyName - Return a unique constant for the given 374 /// name. The return value has type char *. 375 llvm::Constant *GetPropertyName(IdentifierInfo *Ident); 376 377 // FIXME: This can be dropped once string functions are unified. 378 llvm::Constant *GetPropertyTypeString(const ObjCPropertyDecl *PD, 379 const Decl *Container); 380 381 /// GetClassName - Return a unique constant for the given selector's 382 /// name. The return value has type char *. 383 llvm::Constant *GetClassName(IdentifierInfo *Ident); 384 385 const RecordDecl *GetFirstIvarInRecord(const ObjCInterfaceDecl *OID, 386 RecordDecl::field_iterator &FIV, 387 RecordDecl::field_iterator &PIV); 388 /// EmitPropertyList - Emit the given property list. The return 389 /// value has type PropertyListPtrTy. 390 llvm::Constant *EmitPropertyList(const std::string &Name, 391 const Decl *Container, 392 const ObjCContainerDecl *OCD, 393 const ObjCCommonTypesHelper &ObjCTypes); 394 395 /// GetProtocolRef - Return a reference to the internal protocol 396 /// description, creating an empty one if it has not been 397 /// defined. The return value has type ProtocolPtrTy. 398 llvm::Constant *GetProtocolRef(const ObjCProtocolDecl *PD); 399 400public: 401 CGObjCCommonMac(CodeGen::CodeGenModule &cgm) : CGM(cgm) 402 { } 403 404 virtual llvm::Constant *GenerateConstantString(const std::string &String); 405 406 virtual llvm::Function *GenerateMethod(const ObjCMethodDecl *OMD, 407 const ObjCContainerDecl *CD=0); 408 409 virtual void GenerateProtocol(const ObjCProtocolDecl *PD); 410 411 /// GetOrEmitProtocol - Get the protocol object for the given 412 /// declaration, emitting it if necessary. The return value has type 413 /// ProtocolPtrTy. 414 virtual llvm::Constant *GetOrEmitProtocol(const ObjCProtocolDecl *PD)=0; 415 416 /// GetOrEmitProtocolRef - Get a forward reference to the protocol 417 /// object for the given declaration, emitting it if needed. These 418 /// forward references will be filled in with empty bodies if no 419 /// definition is seen. The return value has type ProtocolPtrTy. 420 virtual llvm::Constant *GetOrEmitProtocolRef(const ObjCProtocolDecl *PD)=0; 421}; 422 423class CGObjCMac : public CGObjCCommonMac { 424private: 425 ObjCTypesHelper ObjCTypes; 426 /// EmitImageInfo - Emit the image info marker used to encode some module 427 /// level information. 428 void EmitImageInfo(); 429 430 /// EmitModuleInfo - Another marker encoding module level 431 /// information. 432 void EmitModuleInfo(); 433 434 /// EmitModuleSymols - Emit module symbols, the list of defined 435 /// classes and categories. The result has type SymtabPtrTy. 436 llvm::Constant *EmitModuleSymbols(); 437 438 /// FinishModule - Write out global data structures at the end of 439 /// processing a translation unit. 440 void FinishModule(); 441 442 /// EmitClassExtension - Generate the class extension structure used 443 /// to store the weak ivar layout and properties. The return value 444 /// has type ClassExtensionPtrTy. 445 llvm::Constant *EmitClassExtension(const ObjCImplementationDecl *ID); 446 447 /// EmitClassRef - Return a Value*, of type ObjCTypes.ClassPtrTy, 448 /// for the given class. 449 llvm::Value *EmitClassRef(CGBuilderTy &Builder, 450 const ObjCInterfaceDecl *ID); 451 452 CodeGen::RValue EmitMessageSend(CodeGen::CodeGenFunction &CGF, 453 QualType ResultType, 454 Selector Sel, 455 llvm::Value *Arg0, 456 QualType Arg0Ty, 457 bool IsSuper, 458 const CallArgList &CallArgs); 459 460 /// EmitIvarList - Emit the ivar list for the given 461 /// implementation. If ForClass is true the list of class ivars 462 /// (i.e. metaclass ivars) is emitted, otherwise the list of 463 /// interface ivars will be emitted. The return value has type 464 /// IvarListPtrTy. 465 llvm::Constant *EmitIvarList(const ObjCImplementationDecl *ID, 466 bool ForClass); 467 468 /// EmitMetaClass - Emit a forward reference to the class structure 469 /// for the metaclass of the given interface. The return value has 470 /// type ClassPtrTy. 471 llvm::Constant *EmitMetaClassRef(const ObjCInterfaceDecl *ID); 472 473 /// EmitMetaClass - Emit a class structure for the metaclass of the 474 /// given implementation. The return value has type ClassPtrTy. 475 llvm::Constant *EmitMetaClass(const ObjCImplementationDecl *ID, 476 llvm::Constant *Protocols, 477 const llvm::Type *InterfaceTy, 478 const ConstantVector &Methods); 479 480 llvm::Constant *GetMethodConstant(const ObjCMethodDecl *MD); 481 482 llvm::Constant *GetMethodDescriptionConstant(const ObjCMethodDecl *MD); 483 484 /// EmitMethodList - Emit the method list for the given 485 /// implementation. The return value has type MethodListPtrTy. 486 llvm::Constant *EmitMethodList(const std::string &Name, 487 const char *Section, 488 const ConstantVector &Methods); 489 490 /// EmitMethodDescList - Emit a method description list for a list of 491 /// method declarations. 492 /// - TypeName: The name for the type containing the methods. 493 /// - IsProtocol: True iff these methods are for a protocol. 494 /// - ClassMethds: True iff these are class methods. 495 /// - Required: When true, only "required" methods are 496 /// listed. Similarly, when false only "optional" methods are 497 /// listed. For classes this should always be true. 498 /// - begin, end: The method list to output. 499 /// 500 /// The return value has type MethodDescriptionListPtrTy. 501 llvm::Constant *EmitMethodDescList(const std::string &Name, 502 const char *Section, 503 const ConstantVector &Methods); 504 505 /// GetOrEmitProtocol - Get the protocol object for the given 506 /// declaration, emitting it if necessary. The return value has type 507 /// ProtocolPtrTy. 508 virtual llvm::Constant *GetOrEmitProtocol(const ObjCProtocolDecl *PD); 509 510 /// GetOrEmitProtocolRef - Get a forward reference to the protocol 511 /// object for the given declaration, emitting it if needed. These 512 /// forward references will be filled in with empty bodies if no 513 /// definition is seen. The return value has type ProtocolPtrTy. 514 virtual llvm::Constant *GetOrEmitProtocolRef(const ObjCProtocolDecl *PD); 515 516 /// EmitProtocolExtension - Generate the protocol extension 517 /// structure used to store optional instance and class methods, and 518 /// protocol properties. The return value has type 519 /// ProtocolExtensionPtrTy. 520 llvm::Constant * 521 EmitProtocolExtension(const ObjCProtocolDecl *PD, 522 const ConstantVector &OptInstanceMethods, 523 const ConstantVector &OptClassMethods); 524 525 /// EmitProtocolList - Generate the list of referenced 526 /// protocols. The return value has type ProtocolListPtrTy. 527 llvm::Constant *EmitProtocolList(const std::string &Name, 528 ObjCProtocolDecl::protocol_iterator begin, 529 ObjCProtocolDecl::protocol_iterator end); 530 531 /// EmitSelector - Return a Value*, of type ObjCTypes.SelectorPtrTy, 532 /// for the given selector. 533 llvm::Value *EmitSelector(CGBuilderTy &Builder, Selector Sel); 534 535 public: 536 CGObjCMac(CodeGen::CodeGenModule &cgm); 537 538 virtual llvm::Function *ModuleInitFunction(); 539 540 virtual CodeGen::RValue GenerateMessageSend(CodeGen::CodeGenFunction &CGF, 541 QualType ResultType, 542 Selector Sel, 543 llvm::Value *Receiver, 544 bool IsClassMessage, 545 const CallArgList &CallArgs); 546 547 virtual CodeGen::RValue 548 GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF, 549 QualType ResultType, 550 Selector Sel, 551 const ObjCInterfaceDecl *Class, 552 llvm::Value *Receiver, 553 bool IsClassMessage, 554 const CallArgList &CallArgs); 555 556 virtual llvm::Value *GetClass(CGBuilderTy &Builder, 557 const ObjCInterfaceDecl *ID); 558 559 virtual llvm::Value *GetSelector(CGBuilderTy &Builder, Selector Sel); 560 561 virtual void GenerateCategory(const ObjCCategoryImplDecl *CMD); 562 563 virtual void GenerateClass(const ObjCImplementationDecl *ClassDecl); 564 565 virtual llvm::Value *GenerateProtocolRef(CGBuilderTy &Builder, 566 const ObjCProtocolDecl *PD); 567 568 virtual llvm::Function *GetPropertyGetFunction(); 569 virtual llvm::Function *GetPropertySetFunction(); 570 virtual llvm::Function *EnumerationMutationFunction(); 571 572 virtual void EmitTryOrSynchronizedStmt(CodeGen::CodeGenFunction &CGF, 573 const Stmt &S); 574 virtual void EmitThrowStmt(CodeGen::CodeGenFunction &CGF, 575 const ObjCAtThrowStmt &S); 576 virtual llvm::Value * EmitObjCWeakRead(CodeGen::CodeGenFunction &CGF, 577 llvm::Value *AddrWeakObj); 578 virtual void EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF, 579 llvm::Value *src, llvm::Value *dst); 580 virtual void EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF, 581 llvm::Value *src, llvm::Value *dest); 582 virtual void EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF, 583 llvm::Value *src, llvm::Value *dest); 584 virtual void EmitObjCStrongCastAssign(CodeGen::CodeGenFunction &CGF, 585 llvm::Value *src, llvm::Value *dest); 586 587 virtual LValue EmitObjCValueForIvar(CodeGen::CodeGenFunction &CGF, 588 QualType ObjectTy, 589 llvm::Value *BaseValue, 590 const ObjCIvarDecl *Ivar, 591 const FieldDecl *Field, 592 unsigned CVRQualifiers); 593}; 594 595class CGObjCNonFragileABIMac : public CGObjCCommonMac { 596private: 597 ObjCNonFragileABITypesHelper ObjCTypes; 598 llvm::GlobalVariable* ObjCEmptyCacheVar; 599 llvm::GlobalVariable* ObjCEmptyVtableVar; 600 /// MetaClassReferences - uniqued meta class references. 601 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> MetaClassReferences; 602 603 /// FinishNonFragileABIModule - Write out global data structures at the end of 604 /// processing a translation unit. 605 void FinishNonFragileABIModule(); 606 607 llvm::GlobalVariable * BuildClassRoTInitializer(unsigned flags, 608 unsigned InstanceStart, 609 unsigned InstanceSize, 610 const ObjCImplementationDecl *ID); 611 llvm::GlobalVariable * BuildClassMetaData(std::string &ClassName, 612 llvm::Constant *IsAGV, 613 llvm::Constant *SuperClassGV, 614 llvm::Constant *ClassRoGV, 615 bool HiddenVisibility); 616 617 llvm::Constant *GetMethodConstant(const ObjCMethodDecl *MD); 618 619 llvm::Constant *GetMethodDescriptionConstant(const ObjCMethodDecl *MD); 620 621 /// EmitMethodList - Emit the method list for the given 622 /// implementation. The return value has type MethodListnfABITy. 623 llvm::Constant *EmitMethodList(const std::string &Name, 624 const char *Section, 625 const ConstantVector &Methods); 626 /// EmitIvarList - Emit the ivar list for the given 627 /// implementation. If ForClass is true the list of class ivars 628 /// (i.e. metaclass ivars) is emitted, otherwise the list of 629 /// interface ivars will be emitted. The return value has type 630 /// IvarListnfABIPtrTy. 631 llvm::Constant *EmitIvarList(const ObjCImplementationDecl *ID); 632 633 llvm::Constant *EmitIvarOffsetVar(const ObjCImplementationDecl *ID, 634 const ObjCIvarDecl *Ivar, 635 unsigned long int offset); 636 637 /// GetOrEmitProtocol - Get the protocol object for the given 638 /// declaration, emitting it if necessary. The return value has type 639 /// ProtocolPtrTy. 640 virtual llvm::Constant *GetOrEmitProtocol(const ObjCProtocolDecl *PD); 641 642 /// GetOrEmitProtocolRef - Get a forward reference to the protocol 643 /// object for the given declaration, emitting it if needed. These 644 /// forward references will be filled in with empty bodies if no 645 /// definition is seen. The return value has type ProtocolPtrTy. 646 virtual llvm::Constant *GetOrEmitProtocolRef(const ObjCProtocolDecl *PD); 647 648 /// EmitProtocolList - Generate the list of referenced 649 /// protocols. The return value has type ProtocolListPtrTy. 650 llvm::Constant *EmitProtocolList(const std::string &Name, 651 ObjCProtocolDecl::protocol_iterator begin, 652 ObjCProtocolDecl::protocol_iterator end); 653 654 CodeGen::RValue EmitMessageSend(CodeGen::CodeGenFunction &CGF, 655 QualType ResultType, 656 Selector Sel, 657 llvm::Value *Receiver, 658 QualType Arg0Ty, 659 bool IsSuper, 660 const CallArgList &CallArgs); 661 662 /// EmitClassRef - Return a Value*, of type ObjCTypes.ClassPtrTy, 663 /// for the given class. 664 llvm::Value *EmitClassRef(CGBuilderTy &Builder, 665 const ObjCInterfaceDecl *ID, 666 bool IsSuper = false); 667 668 /// EmitMetaClassRef - Return a Value * of the address of _class_t 669 /// meta-data 670 llvm::Value *EmitMetaClassRef(CGBuilderTy &Builder, 671 const ObjCInterfaceDecl *ID); 672 673 674public: 675 CGObjCNonFragileABIMac(CodeGen::CodeGenModule &cgm); 676 // FIXME. All stubs for now! 677 virtual llvm::Function *ModuleInitFunction(); 678 679 virtual CodeGen::RValue GenerateMessageSend(CodeGen::CodeGenFunction &CGF, 680 QualType ResultType, 681 Selector Sel, 682 llvm::Value *Receiver, 683 bool IsClassMessage, 684 const CallArgList &CallArgs); 685 686 virtual CodeGen::RValue 687 GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF, 688 QualType ResultType, 689 Selector Sel, 690 const ObjCInterfaceDecl *Class, 691 llvm::Value *Receiver, 692 bool IsClassMessage, 693 const CallArgList &CallArgs); 694 695 virtual llvm::Value *GetClass(CGBuilderTy &Builder, 696 const ObjCInterfaceDecl *ID); 697 698 virtual llvm::Value *GetSelector(CGBuilderTy &Builder, Selector Sel) 699 { return 0; } 700 701 virtual void GenerateCategory(const ObjCCategoryImplDecl *CMD); 702 703 virtual void GenerateClass(const ObjCImplementationDecl *ClassDecl); 704 virtual llvm::Value *GenerateProtocolRef(CGBuilderTy &Builder, 705 const ObjCProtocolDecl *PD); 706 707 virtual llvm::Function *GetPropertyGetFunction(){ return 0; } 708 virtual llvm::Function *GetPropertySetFunction() 709 { return 0; } 710 virtual llvm::Function *EnumerationMutationFunction() 711 { return 0; } 712 713 virtual void EmitTryOrSynchronizedStmt(CodeGen::CodeGenFunction &CGF, 714 const Stmt &S) 715 { return; } 716 virtual void EmitThrowStmt(CodeGen::CodeGenFunction &CGF, 717 const ObjCAtThrowStmt &S) 718 { return; } 719 virtual llvm::Value * EmitObjCWeakRead(CodeGen::CodeGenFunction &CGF, 720 llvm::Value *AddrWeakObj) 721 { return 0; } 722 virtual void EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF, 723 llvm::Value *src, llvm::Value *dst) 724 { return; } 725 virtual void EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF, 726 llvm::Value *src, llvm::Value *dest) 727 { return; } 728 virtual void EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF, 729 llvm::Value *src, llvm::Value *dest) 730 { return; } 731 virtual void EmitObjCStrongCastAssign(CodeGen::CodeGenFunction &CGF, 732 llvm::Value *src, llvm::Value *dest) 733 { return; } 734 virtual LValue EmitObjCValueForIvar(CodeGen::CodeGenFunction &CGF, 735 QualType ObjectTy, 736 llvm::Value *BaseValue, 737 const ObjCIvarDecl *Ivar, 738 const FieldDecl *Field, 739 unsigned CVRQualifiers); 740}; 741 742} // end anonymous namespace 743 744/* *** Helper Functions *** */ 745 746/// getConstantGEP() - Help routine to construct simple GEPs. 747static llvm::Constant *getConstantGEP(llvm::Constant *C, 748 unsigned idx0, 749 unsigned idx1) { 750 llvm::Value *Idxs[] = { 751 llvm::ConstantInt::get(llvm::Type::Int32Ty, idx0), 752 llvm::ConstantInt::get(llvm::Type::Int32Ty, idx1) 753 }; 754 return llvm::ConstantExpr::getGetElementPtr(C, Idxs, 2); 755} 756 757/* *** CGObjCMac Public Interface *** */ 758 759CGObjCMac::CGObjCMac(CodeGen::CodeGenModule &cgm) : CGObjCCommonMac(cgm), 760 ObjCTypes(cgm) 761{ 762 ObjCABI = 1; 763 EmitImageInfo(); 764} 765 766/// GetClass - Return a reference to the class for the given interface 767/// decl. 768llvm::Value *CGObjCMac::GetClass(CGBuilderTy &Builder, 769 const ObjCInterfaceDecl *ID) { 770 return EmitClassRef(Builder, ID); 771} 772 773/// GetSelector - Return the pointer to the unique'd string for this selector. 774llvm::Value *CGObjCMac::GetSelector(CGBuilderTy &Builder, Selector Sel) { 775 return EmitSelector(Builder, Sel); 776} 777 778/// Generate a constant CFString object. 779/* 780 struct __builtin_CFString { 781 const int *isa; // point to __CFConstantStringClassReference 782 int flags; 783 const char *str; 784 long length; 785 }; 786*/ 787 788llvm::Constant *CGObjCCommonMac::GenerateConstantString( 789 const std::string &String) { 790 return CGM.GetAddrOfConstantCFString(String); 791} 792 793/// Generates a message send where the super is the receiver. This is 794/// a message send to self with special delivery semantics indicating 795/// which class's method should be called. 796CodeGen::RValue 797CGObjCMac::GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF, 798 QualType ResultType, 799 Selector Sel, 800 const ObjCInterfaceDecl *Class, 801 llvm::Value *Receiver, 802 bool IsClassMessage, 803 const CodeGen::CallArgList &CallArgs) { 804 // Create and init a super structure; this is a (receiver, class) 805 // pair we will pass to objc_msgSendSuper. 806 llvm::Value *ObjCSuper = 807 CGF.Builder.CreateAlloca(ObjCTypes.SuperTy, 0, "objc_super"); 808 llvm::Value *ReceiverAsObject = 809 CGF.Builder.CreateBitCast(Receiver, ObjCTypes.ObjectPtrTy); 810 CGF.Builder.CreateStore(ReceiverAsObject, 811 CGF.Builder.CreateStructGEP(ObjCSuper, 0)); 812 813 // If this is a class message the metaclass is passed as the target. 814 llvm::Value *Target; 815 if (IsClassMessage) { 816 llvm::Value *MetaClassPtr = EmitMetaClassRef(Class); 817 llvm::Value *SuperPtr = CGF.Builder.CreateStructGEP(MetaClassPtr, 1); 818 llvm::Value *Super = CGF.Builder.CreateLoad(SuperPtr); 819 Target = Super; 820 } else { 821 Target = EmitClassRef(CGF.Builder, Class->getSuperClass()); 822 } 823 // FIXME: We shouldn't need to do this cast, rectify the ASTContext 824 // and ObjCTypes types. 825 const llvm::Type *ClassTy = 826 CGM.getTypes().ConvertType(CGF.getContext().getObjCClassType()); 827 Target = CGF.Builder.CreateBitCast(Target, ClassTy); 828 CGF.Builder.CreateStore(Target, 829 CGF.Builder.CreateStructGEP(ObjCSuper, 1)); 830 831 return EmitMessageSend(CGF, ResultType, Sel, 832 ObjCSuper, ObjCTypes.SuperPtrCTy, 833 true, CallArgs); 834} 835 836/// Generate code for a message send expression. 837CodeGen::RValue CGObjCMac::GenerateMessageSend(CodeGen::CodeGenFunction &CGF, 838 QualType ResultType, 839 Selector Sel, 840 llvm::Value *Receiver, 841 bool IsClassMessage, 842 const CallArgList &CallArgs) { 843 llvm::Value *Arg0 = 844 CGF.Builder.CreateBitCast(Receiver, ObjCTypes.ObjectPtrTy, "tmp"); 845 return EmitMessageSend(CGF, ResultType, Sel, 846 Arg0, CGF.getContext().getObjCIdType(), 847 false, CallArgs); 848} 849 850CodeGen::RValue CGObjCMac::EmitMessageSend(CodeGen::CodeGenFunction &CGF, 851 QualType ResultType, 852 Selector Sel, 853 llvm::Value *Arg0, 854 QualType Arg0Ty, 855 bool IsSuper, 856 const CallArgList &CallArgs) { 857 CallArgList ActualArgs; 858 ActualArgs.push_back(std::make_pair(RValue::get(Arg0), Arg0Ty)); 859 ActualArgs.push_back(std::make_pair(RValue::get(EmitSelector(CGF.Builder, 860 Sel)), 861 CGF.getContext().getObjCSelType())); 862 ActualArgs.insert(ActualArgs.end(), CallArgs.begin(), CallArgs.end()); 863 864 CodeGenTypes &Types = CGM.getTypes(); 865 const CGFunctionInfo &FnInfo = Types.getFunctionInfo(ResultType, ActualArgs); 866 const llvm::FunctionType *FTy = Types.GetFunctionType(FnInfo, false); 867 868 llvm::Constant *Fn; 869 if (CGM.ReturnTypeUsesSret(FnInfo)) { 870 Fn = ObjCTypes.getSendStretFn(IsSuper); 871 } else if (ResultType->isFloatingType()) { 872 // FIXME: Sadly, this is wrong. This actually depends on the 873 // architecture. This happens to be right for x86-32 though. 874 Fn = ObjCTypes.getSendFpretFn(IsSuper); 875 } else { 876 Fn = ObjCTypes.getSendFn(IsSuper); 877 } 878 Fn = llvm::ConstantExpr::getBitCast(Fn, llvm::PointerType::getUnqual(FTy)); 879 return CGF.EmitCall(FnInfo, Fn, ActualArgs); 880} 881 882llvm::Value *CGObjCMac::GenerateProtocolRef(CGBuilderTy &Builder, 883 const ObjCProtocolDecl *PD) { 884 // FIXME: I don't understand why gcc generates this, or where it is 885 // resolved. Investigate. Its also wasteful to look this up over and 886 // over. 887 LazySymbols.insert(&CGM.getContext().Idents.get("Protocol")); 888 889 return llvm::ConstantExpr::getBitCast(GetProtocolRef(PD), 890 ObjCTypes.ExternalProtocolPtrTy); 891} 892 893void CGObjCCommonMac::GenerateProtocol(const ObjCProtocolDecl *PD) { 894 // FIXME: We shouldn't need this, the protocol decl should contain 895 // enough information to tell us whether this was a declaration or a 896 // definition. 897 DefinedProtocols.insert(PD->getIdentifier()); 898 899 // If we have generated a forward reference to this protocol, emit 900 // it now. Otherwise do nothing, the protocol objects are lazily 901 // emitted. 902 if (Protocols.count(PD->getIdentifier())) 903 GetOrEmitProtocol(PD); 904} 905 906llvm::Constant *CGObjCCommonMac::GetProtocolRef(const ObjCProtocolDecl *PD) { 907 if (DefinedProtocols.count(PD->getIdentifier())) 908 return GetOrEmitProtocol(PD); 909 return GetOrEmitProtocolRef(PD); 910} 911 912/* 913 // APPLE LOCAL radar 4585769 - Objective-C 1.0 extensions 914 struct _objc_protocol { 915 struct _objc_protocol_extension *isa; 916 char *protocol_name; 917 struct _objc_protocol_list *protocol_list; 918 struct _objc__method_prototype_list *instance_methods; 919 struct _objc__method_prototype_list *class_methods 920 }; 921 922 See EmitProtocolExtension(). 923*/ 924llvm::Constant *CGObjCMac::GetOrEmitProtocol(const ObjCProtocolDecl *PD) { 925 llvm::GlobalVariable *&Entry = Protocols[PD->getIdentifier()]; 926 927 // Early exit if a defining object has already been generated. 928 if (Entry && Entry->hasInitializer()) 929 return Entry; 930 931 // FIXME: I don't understand why gcc generates this, or where it is 932 // resolved. Investigate. Its also wasteful to look this up over and 933 // over. 934 LazySymbols.insert(&CGM.getContext().Idents.get("Protocol")); 935 936 const char *ProtocolName = PD->getNameAsCString(); 937 938 // Construct method lists. 939 std::vector<llvm::Constant*> InstanceMethods, ClassMethods; 940 std::vector<llvm::Constant*> OptInstanceMethods, OptClassMethods; 941 for (ObjCProtocolDecl::instmeth_iterator i = PD->instmeth_begin(), 942 e = PD->instmeth_end(); i != e; ++i) { 943 ObjCMethodDecl *MD = *i; 944 llvm::Constant *C = GetMethodDescriptionConstant(MD); 945 if (MD->getImplementationControl() == ObjCMethodDecl::Optional) { 946 OptInstanceMethods.push_back(C); 947 } else { 948 InstanceMethods.push_back(C); 949 } 950 } 951 952 for (ObjCProtocolDecl::classmeth_iterator i = PD->classmeth_begin(), 953 e = PD->classmeth_end(); i != e; ++i) { 954 ObjCMethodDecl *MD = *i; 955 llvm::Constant *C = GetMethodDescriptionConstant(MD); 956 if (MD->getImplementationControl() == ObjCMethodDecl::Optional) { 957 OptClassMethods.push_back(C); 958 } else { 959 ClassMethods.push_back(C); 960 } 961 } 962 963 std::vector<llvm::Constant*> Values(5); 964 Values[0] = EmitProtocolExtension(PD, OptInstanceMethods, OptClassMethods); 965 Values[1] = GetClassName(PD->getIdentifier()); 966 Values[2] = 967 EmitProtocolList("\01L_OBJC_PROTOCOL_REFS_" + PD->getNameAsString(), 968 PD->protocol_begin(), 969 PD->protocol_end()); 970 Values[3] = 971 EmitMethodDescList("\01L_OBJC_PROTOCOL_INSTANCE_METHODS_" 972 + PD->getNameAsString(), 973 "__OBJC,__cat_inst_meth,regular,no_dead_strip", 974 InstanceMethods); 975 Values[4] = 976 EmitMethodDescList("\01L_OBJC_PROTOCOL_CLASS_METHODS_" 977 + PD->getNameAsString(), 978 "__OBJC,__cat_cls_meth,regular,no_dead_strip", 979 ClassMethods); 980 llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.ProtocolTy, 981 Values); 982 983 if (Entry) { 984 // Already created, fix the linkage and update the initializer. 985 Entry->setLinkage(llvm::GlobalValue::InternalLinkage); 986 Entry->setInitializer(Init); 987 } else { 988 Entry = 989 new llvm::GlobalVariable(ObjCTypes.ProtocolTy, false, 990 llvm::GlobalValue::InternalLinkage, 991 Init, 992 std::string("\01L_OBJC_PROTOCOL_")+ProtocolName, 993 &CGM.getModule()); 994 Entry->setSection("__OBJC,__protocol,regular,no_dead_strip"); 995 UsedGlobals.push_back(Entry); 996 // FIXME: Is this necessary? Why only for protocol? 997 Entry->setAlignment(4); 998 } 999 1000 return Entry; 1001} 1002 1003llvm::Constant *CGObjCMac::GetOrEmitProtocolRef(const ObjCProtocolDecl *PD) { 1004 llvm::GlobalVariable *&Entry = Protocols[PD->getIdentifier()]; 1005 1006 if (!Entry) { 1007 // We use the initializer as a marker of whether this is a forward 1008 // reference or not. At module finalization we add the empty 1009 // contents for protocols which were referenced but never defined. 1010 Entry = 1011 new llvm::GlobalVariable(ObjCTypes.ProtocolTy, false, 1012 llvm::GlobalValue::ExternalLinkage, 1013 0, 1014 "\01L_OBJC_PROTOCOL_" + PD->getNameAsString(), 1015 &CGM.getModule()); 1016 Entry->setSection("__OBJC,__protocol,regular,no_dead_strip"); 1017 UsedGlobals.push_back(Entry); 1018 // FIXME: Is this necessary? Why only for protocol? 1019 Entry->setAlignment(4); 1020 } 1021 1022 return Entry; 1023} 1024 1025/* 1026 struct _objc_protocol_extension { 1027 uint32_t size; 1028 struct objc_method_description_list *optional_instance_methods; 1029 struct objc_method_description_list *optional_class_methods; 1030 struct objc_property_list *instance_properties; 1031 }; 1032*/ 1033llvm::Constant * 1034CGObjCMac::EmitProtocolExtension(const ObjCProtocolDecl *PD, 1035 const ConstantVector &OptInstanceMethods, 1036 const ConstantVector &OptClassMethods) { 1037 uint64_t Size = 1038 CGM.getTargetData().getTypePaddedSize(ObjCTypes.ProtocolExtensionTy); 1039 std::vector<llvm::Constant*> Values(4); 1040 Values[0] = llvm::ConstantInt::get(ObjCTypes.IntTy, Size); 1041 Values[1] = 1042 EmitMethodDescList("\01L_OBJC_PROTOCOL_INSTANCE_METHODS_OPT_" 1043 + PD->getNameAsString(), 1044 "__OBJC,__cat_inst_meth,regular,no_dead_strip", 1045 OptInstanceMethods); 1046 Values[2] = 1047 EmitMethodDescList("\01L_OBJC_PROTOCOL_CLASS_METHODS_OPT_" 1048 + PD->getNameAsString(), 1049 "__OBJC,__cat_cls_meth,regular,no_dead_strip", 1050 OptClassMethods); 1051 Values[3] = EmitPropertyList("\01L_OBJC_$_PROP_PROTO_LIST_" + 1052 PD->getNameAsString(), 1053 0, PD, ObjCTypes); 1054 1055 // Return null if no extension bits are used. 1056 if (Values[1]->isNullValue() && Values[2]->isNullValue() && 1057 Values[3]->isNullValue()) 1058 return llvm::Constant::getNullValue(ObjCTypes.ProtocolExtensionPtrTy); 1059 1060 llvm::Constant *Init = 1061 llvm::ConstantStruct::get(ObjCTypes.ProtocolExtensionTy, Values); 1062 llvm::GlobalVariable *GV = 1063 new llvm::GlobalVariable(ObjCTypes.ProtocolExtensionTy, false, 1064 llvm::GlobalValue::InternalLinkage, 1065 Init, 1066 "\01L_OBJC_PROTOCOLEXT_" + PD->getNameAsString(), 1067 &CGM.getModule()); 1068 // No special section, but goes in llvm.used 1069 UsedGlobals.push_back(GV); 1070 1071 return GV; 1072} 1073 1074/* 1075 struct objc_protocol_list { 1076 struct objc_protocol_list *next; 1077 long count; 1078 Protocol *list[]; 1079 }; 1080*/ 1081llvm::Constant * 1082CGObjCMac::EmitProtocolList(const std::string &Name, 1083 ObjCProtocolDecl::protocol_iterator begin, 1084 ObjCProtocolDecl::protocol_iterator end) { 1085 std::vector<llvm::Constant*> ProtocolRefs; 1086 1087 for (; begin != end; ++begin) 1088 ProtocolRefs.push_back(GetProtocolRef(*begin)); 1089 1090 // Just return null for empty protocol lists 1091 if (ProtocolRefs.empty()) 1092 return llvm::Constant::getNullValue(ObjCTypes.ProtocolListPtrTy); 1093 1094 // This list is null terminated. 1095 ProtocolRefs.push_back(llvm::Constant::getNullValue(ObjCTypes.ProtocolPtrTy)); 1096 1097 std::vector<llvm::Constant*> Values(3); 1098 // This field is only used by the runtime. 1099 Values[0] = llvm::Constant::getNullValue(ObjCTypes.ProtocolListPtrTy); 1100 Values[1] = llvm::ConstantInt::get(ObjCTypes.LongTy, ProtocolRefs.size() - 1); 1101 Values[2] = 1102 llvm::ConstantArray::get(llvm::ArrayType::get(ObjCTypes.ProtocolPtrTy, 1103 ProtocolRefs.size()), 1104 ProtocolRefs); 1105 1106 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 1107 llvm::GlobalVariable *GV = 1108 new llvm::GlobalVariable(Init->getType(), false, 1109 llvm::GlobalValue::InternalLinkage, 1110 Init, 1111 Name, 1112 &CGM.getModule()); 1113 GV->setSection("__OBJC,__cat_cls_meth,regular,no_dead_strip"); 1114 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.ProtocolListPtrTy); 1115} 1116 1117/* 1118 struct _objc_property { 1119 const char * const name; 1120 const char * const attributes; 1121 }; 1122 1123 struct _objc_property_list { 1124 uint32_t entsize; // sizeof (struct _objc_property) 1125 uint32_t prop_count; 1126 struct _objc_property[prop_count]; 1127 }; 1128*/ 1129llvm::Constant *CGObjCCommonMac::EmitPropertyList(const std::string &Name, 1130 const Decl *Container, 1131 const ObjCContainerDecl *OCD, 1132 const ObjCCommonTypesHelper &ObjCTypes) { 1133 std::vector<llvm::Constant*> Properties, Prop(2); 1134 for (ObjCContainerDecl::prop_iterator I = OCD->prop_begin(), 1135 E = OCD->prop_end(); I != E; ++I) { 1136 const ObjCPropertyDecl *PD = *I; 1137 Prop[0] = GetPropertyName(PD->getIdentifier()); 1138 Prop[1] = GetPropertyTypeString(PD, Container); 1139 Properties.push_back(llvm::ConstantStruct::get(ObjCTypes.PropertyTy, 1140 Prop)); 1141 } 1142 1143 // Return null for empty list. 1144 if (Properties.empty()) 1145 return llvm::Constant::getNullValue(ObjCTypes.PropertyListPtrTy); 1146 1147 unsigned PropertySize = 1148 CGM.getTargetData().getTypePaddedSize(ObjCTypes.PropertyTy); 1149 std::vector<llvm::Constant*> Values(3); 1150 Values[0] = llvm::ConstantInt::get(ObjCTypes.IntTy, PropertySize); 1151 Values[1] = llvm::ConstantInt::get(ObjCTypes.IntTy, Properties.size()); 1152 llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.PropertyTy, 1153 Properties.size()); 1154 Values[2] = llvm::ConstantArray::get(AT, Properties); 1155 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 1156 1157 llvm::GlobalVariable *GV = 1158 new llvm::GlobalVariable(Init->getType(), false, 1159 llvm::GlobalValue::InternalLinkage, 1160 Init, 1161 Name, 1162 &CGM.getModule()); 1163 if (ObjCABI == 2) 1164 GV->setSection("__DATA, __objc_const"); 1165 // No special section on property lists? 1166 UsedGlobals.push_back(GV); 1167 return llvm::ConstantExpr::getBitCast(GV, 1168 ObjCTypes.PropertyListPtrTy); 1169 1170} 1171 1172/* 1173 struct objc_method_description_list { 1174 int count; 1175 struct objc_method_description list[]; 1176 }; 1177*/ 1178llvm::Constant * 1179CGObjCMac::GetMethodDescriptionConstant(const ObjCMethodDecl *MD) { 1180 std::vector<llvm::Constant*> Desc(2); 1181 Desc[0] = llvm::ConstantExpr::getBitCast(GetMethodVarName(MD->getSelector()), 1182 ObjCTypes.SelectorPtrTy); 1183 Desc[1] = GetMethodVarType(MD); 1184 return llvm::ConstantStruct::get(ObjCTypes.MethodDescriptionTy, 1185 Desc); 1186} 1187 1188llvm::Constant *CGObjCMac::EmitMethodDescList(const std::string &Name, 1189 const char *Section, 1190 const ConstantVector &Methods) { 1191 // Return null for empty list. 1192 if (Methods.empty()) 1193 return llvm::Constant::getNullValue(ObjCTypes.MethodDescriptionListPtrTy); 1194 1195 std::vector<llvm::Constant*> Values(2); 1196 Values[0] = llvm::ConstantInt::get(ObjCTypes.IntTy, Methods.size()); 1197 llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.MethodDescriptionTy, 1198 Methods.size()); 1199 Values[1] = llvm::ConstantArray::get(AT, Methods); 1200 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 1201 1202 llvm::GlobalVariable *GV = 1203 new llvm::GlobalVariable(Init->getType(), false, 1204 llvm::GlobalValue::InternalLinkage, 1205 Init, Name, &CGM.getModule()); 1206 GV->setSection(Section); 1207 UsedGlobals.push_back(GV); 1208 return llvm::ConstantExpr::getBitCast(GV, 1209 ObjCTypes.MethodDescriptionListPtrTy); 1210} 1211 1212/* 1213 struct _objc_category { 1214 char *category_name; 1215 char *class_name; 1216 struct _objc_method_list *instance_methods; 1217 struct _objc_method_list *class_methods; 1218 struct _objc_protocol_list *protocols; 1219 uint32_t size; // <rdar://4585769> 1220 struct _objc_property_list *instance_properties; 1221 }; 1222 */ 1223void CGObjCMac::GenerateCategory(const ObjCCategoryImplDecl *OCD) { 1224 unsigned Size = CGM.getTargetData().getTypePaddedSize(ObjCTypes.CategoryTy); 1225 1226 // FIXME: This is poor design, the OCD should have a pointer to the 1227 // category decl. Additionally, note that Category can be null for 1228 // the @implementation w/o an @interface case. Sema should just 1229 // create one for us as it does for @implementation so everyone else 1230 // can live life under a clear blue sky. 1231 const ObjCInterfaceDecl *Interface = OCD->getClassInterface(); 1232 const ObjCCategoryDecl *Category = 1233 Interface->FindCategoryDeclaration(OCD->getIdentifier()); 1234 std::string ExtName(Interface->getNameAsString() + "_" + 1235 OCD->getNameAsString()); 1236 1237 std::vector<llvm::Constant*> InstanceMethods, ClassMethods; 1238 for (ObjCCategoryImplDecl::instmeth_iterator i = OCD->instmeth_begin(), 1239 e = OCD->instmeth_end(); i != e; ++i) { 1240 // Instance methods should always be defined. 1241 InstanceMethods.push_back(GetMethodConstant(*i)); 1242 } 1243 for (ObjCCategoryImplDecl::classmeth_iterator i = OCD->classmeth_begin(), 1244 e = OCD->classmeth_end(); i != e; ++i) { 1245 // Class methods should always be defined. 1246 ClassMethods.push_back(GetMethodConstant(*i)); 1247 } 1248 1249 std::vector<llvm::Constant*> Values(7); 1250 Values[0] = GetClassName(OCD->getIdentifier()); 1251 Values[1] = GetClassName(Interface->getIdentifier()); 1252 Values[2] = 1253 EmitMethodList(std::string("\01L_OBJC_CATEGORY_INSTANCE_METHODS_") + 1254 ExtName, 1255 "__OBJC,__cat_inst_meth,regular,no_dead_strip", 1256 InstanceMethods); 1257 Values[3] = 1258 EmitMethodList(std::string("\01L_OBJC_CATEGORY_CLASS_METHODS_") + ExtName, 1259 "__OBJC,__cat_class_meth,regular,no_dead_strip", 1260 ClassMethods); 1261 if (Category) { 1262 Values[4] = 1263 EmitProtocolList(std::string("\01L_OBJC_CATEGORY_PROTOCOLS_") + ExtName, 1264 Category->protocol_begin(), 1265 Category->protocol_end()); 1266 } else { 1267 Values[4] = llvm::Constant::getNullValue(ObjCTypes.ProtocolListPtrTy); 1268 } 1269 Values[5] = llvm::ConstantInt::get(ObjCTypes.IntTy, Size); 1270 1271 // If there is no category @interface then there can be no properties. 1272 if (Category) { 1273 Values[6] = EmitPropertyList(std::string("\01L_OBJC_$_PROP_LIST_") + ExtName, 1274 OCD, Category, ObjCTypes); 1275 } else { 1276 Values[6] = llvm::Constant::getNullValue(ObjCTypes.PropertyListPtrTy); 1277 } 1278 1279 llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.CategoryTy, 1280 Values); 1281 1282 llvm::GlobalVariable *GV = 1283 new llvm::GlobalVariable(ObjCTypes.CategoryTy, false, 1284 llvm::GlobalValue::InternalLinkage, 1285 Init, 1286 std::string("\01L_OBJC_CATEGORY_")+ExtName, 1287 &CGM.getModule()); 1288 GV->setSection("__OBJC,__category,regular,no_dead_strip"); 1289 UsedGlobals.push_back(GV); 1290 DefinedCategories.push_back(GV); 1291} 1292 1293// FIXME: Get from somewhere? 1294enum ClassFlags { 1295 eClassFlags_Factory = 0x00001, 1296 eClassFlags_Meta = 0x00002, 1297 // <rdr://5142207> 1298 eClassFlags_HasCXXStructors = 0x02000, 1299 eClassFlags_Hidden = 0x20000, 1300 eClassFlags_ABI2_Hidden = 0x00010, 1301 eClassFlags_ABI2_HasCXXStructors = 0x00004 // <rdr://4923634> 1302}; 1303 1304// <rdr://5142207&4705298&4843145> 1305static bool IsClassHidden(const ObjCInterfaceDecl *ID) { 1306 if (const VisibilityAttr *attr = ID->getAttr<VisibilityAttr>()) { 1307 // FIXME: Support -fvisibility 1308 switch (attr->getVisibility()) { 1309 default: 1310 assert(0 && "Unknown visibility"); 1311 return false; 1312 case VisibilityAttr::DefaultVisibility: 1313 case VisibilityAttr::ProtectedVisibility: // FIXME: What do we do here? 1314 return false; 1315 case VisibilityAttr::HiddenVisibility: 1316 return true; 1317 } 1318 } else { 1319 return false; // FIXME: Support -fvisibility 1320 } 1321} 1322 1323/* 1324 struct _objc_class { 1325 Class isa; 1326 Class super_class; 1327 const char *name; 1328 long version; 1329 long info; 1330 long instance_size; 1331 struct _objc_ivar_list *ivars; 1332 struct _objc_method_list *methods; 1333 struct _objc_cache *cache; 1334 struct _objc_protocol_list *protocols; 1335 // Objective-C 1.0 extensions (<rdr://4585769>) 1336 const char *ivar_layout; 1337 struct _objc_class_ext *ext; 1338 }; 1339 1340 See EmitClassExtension(); 1341 */ 1342void CGObjCMac::GenerateClass(const ObjCImplementationDecl *ID) { 1343 DefinedSymbols.insert(ID->getIdentifier()); 1344 1345 std::string ClassName = ID->getNameAsString(); 1346 // FIXME: Gross 1347 ObjCInterfaceDecl *Interface = 1348 const_cast<ObjCInterfaceDecl*>(ID->getClassInterface()); 1349 llvm::Constant *Protocols = 1350 EmitProtocolList("\01L_OBJC_CLASS_PROTOCOLS_" + ID->getNameAsString(), 1351 Interface->protocol_begin(), 1352 Interface->protocol_end()); 1353 const llvm::Type *InterfaceTy = 1354 CGM.getTypes().ConvertType(CGM.getContext().getObjCInterfaceType(Interface)); 1355 unsigned Flags = eClassFlags_Factory; 1356 unsigned Size = CGM.getTargetData().getTypePaddedSize(InterfaceTy); 1357 1358 // FIXME: Set CXX-structors flag. 1359 if (IsClassHidden(ID->getClassInterface())) 1360 Flags |= eClassFlags_Hidden; 1361 1362 std::vector<llvm::Constant*> InstanceMethods, ClassMethods; 1363 for (ObjCImplementationDecl::instmeth_iterator i = ID->instmeth_begin(), 1364 e = ID->instmeth_end(); i != e; ++i) { 1365 // Instance methods should always be defined. 1366 InstanceMethods.push_back(GetMethodConstant(*i)); 1367 } 1368 for (ObjCImplementationDecl::classmeth_iterator i = ID->classmeth_begin(), 1369 e = ID->classmeth_end(); i != e; ++i) { 1370 // Class methods should always be defined. 1371 ClassMethods.push_back(GetMethodConstant(*i)); 1372 } 1373 1374 for (ObjCImplementationDecl::propimpl_iterator i = ID->propimpl_begin(), 1375 e = ID->propimpl_end(); i != e; ++i) { 1376 ObjCPropertyImplDecl *PID = *i; 1377 1378 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) { 1379 ObjCPropertyDecl *PD = PID->getPropertyDecl(); 1380 1381 if (ObjCMethodDecl *MD = PD->getGetterMethodDecl()) 1382 if (llvm::Constant *C = GetMethodConstant(MD)) 1383 InstanceMethods.push_back(C); 1384 if (ObjCMethodDecl *MD = PD->getSetterMethodDecl()) 1385 if (llvm::Constant *C = GetMethodConstant(MD)) 1386 InstanceMethods.push_back(C); 1387 } 1388 } 1389 1390 std::vector<llvm::Constant*> Values(12); 1391 Values[ 0] = EmitMetaClass(ID, Protocols, InterfaceTy, ClassMethods); 1392 if (ObjCInterfaceDecl *Super = Interface->getSuperClass()) { 1393 // Record a reference to the super class. 1394 LazySymbols.insert(Super->getIdentifier()); 1395 1396 Values[ 1] = 1397 llvm::ConstantExpr::getBitCast(GetClassName(Super->getIdentifier()), 1398 ObjCTypes.ClassPtrTy); 1399 } else { 1400 Values[ 1] = llvm::Constant::getNullValue(ObjCTypes.ClassPtrTy); 1401 } 1402 Values[ 2] = GetClassName(ID->getIdentifier()); 1403 // Version is always 0. 1404 Values[ 3] = llvm::ConstantInt::get(ObjCTypes.LongTy, 0); 1405 Values[ 4] = llvm::ConstantInt::get(ObjCTypes.LongTy, Flags); 1406 Values[ 5] = llvm::ConstantInt::get(ObjCTypes.LongTy, Size); 1407 Values[ 6] = EmitIvarList(ID, false); 1408 Values[ 7] = 1409 EmitMethodList("\01L_OBJC_INSTANCE_METHODS_" + ID->getNameAsString(), 1410 "__OBJC,__inst_meth,regular,no_dead_strip", 1411 InstanceMethods); 1412 // cache is always NULL. 1413 Values[ 8] = llvm::Constant::getNullValue(ObjCTypes.CachePtrTy); 1414 Values[ 9] = Protocols; 1415 // FIXME: Set ivar_layout 1416 Values[10] = llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy); 1417 Values[11] = EmitClassExtension(ID); 1418 llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.ClassTy, 1419 Values); 1420 1421 llvm::GlobalVariable *GV = 1422 new llvm::GlobalVariable(ObjCTypes.ClassTy, false, 1423 llvm::GlobalValue::InternalLinkage, 1424 Init, 1425 std::string("\01L_OBJC_CLASS_")+ClassName, 1426 &CGM.getModule()); 1427 GV->setSection("__OBJC,__class,regular,no_dead_strip"); 1428 UsedGlobals.push_back(GV); 1429 // FIXME: Why? 1430 GV->setAlignment(32); 1431 DefinedClasses.push_back(GV); 1432} 1433 1434llvm::Constant *CGObjCMac::EmitMetaClass(const ObjCImplementationDecl *ID, 1435 llvm::Constant *Protocols, 1436 const llvm::Type *InterfaceTy, 1437 const ConstantVector &Methods) { 1438 unsigned Flags = eClassFlags_Meta; 1439 unsigned Size = CGM.getTargetData().getTypePaddedSize(ObjCTypes.ClassTy); 1440 1441 if (IsClassHidden(ID->getClassInterface())) 1442 Flags |= eClassFlags_Hidden; 1443 1444 std::vector<llvm::Constant*> Values(12); 1445 // The isa for the metaclass is the root of the hierarchy. 1446 const ObjCInterfaceDecl *Root = ID->getClassInterface(); 1447 while (const ObjCInterfaceDecl *Super = Root->getSuperClass()) 1448 Root = Super; 1449 Values[ 0] = 1450 llvm::ConstantExpr::getBitCast(GetClassName(Root->getIdentifier()), 1451 ObjCTypes.ClassPtrTy); 1452 // The super class for the metaclass is emitted as the name of the 1453 // super class. The runtime fixes this up to point to the 1454 // *metaclass* for the super class. 1455 if (ObjCInterfaceDecl *Super = ID->getClassInterface()->getSuperClass()) { 1456 Values[ 1] = 1457 llvm::ConstantExpr::getBitCast(GetClassName(Super->getIdentifier()), 1458 ObjCTypes.ClassPtrTy); 1459 } else { 1460 Values[ 1] = llvm::Constant::getNullValue(ObjCTypes.ClassPtrTy); 1461 } 1462 Values[ 2] = GetClassName(ID->getIdentifier()); 1463 // Version is always 0. 1464 Values[ 3] = llvm::ConstantInt::get(ObjCTypes.LongTy, 0); 1465 Values[ 4] = llvm::ConstantInt::get(ObjCTypes.LongTy, Flags); 1466 Values[ 5] = llvm::ConstantInt::get(ObjCTypes.LongTy, Size); 1467 Values[ 6] = EmitIvarList(ID, true); 1468 Values[ 7] = 1469 EmitMethodList("\01L_OBJC_CLASS_METHODS_" + ID->getNameAsString(), 1470 "__OBJC,__inst_meth,regular,no_dead_strip", 1471 Methods); 1472 // cache is always NULL. 1473 Values[ 8] = llvm::Constant::getNullValue(ObjCTypes.CachePtrTy); 1474 Values[ 9] = Protocols; 1475 // ivar_layout for metaclass is always NULL. 1476 Values[10] = llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy); 1477 // The class extension is always unused for metaclasses. 1478 Values[11] = llvm::Constant::getNullValue(ObjCTypes.ClassExtensionPtrTy); 1479 llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.ClassTy, 1480 Values); 1481 1482 std::string Name("\01L_OBJC_METACLASS_"); 1483 Name += ID->getNameAsCString(); 1484 1485 // Check for a forward reference. 1486 llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name); 1487 if (GV) { 1488 assert(GV->getType()->getElementType() == ObjCTypes.ClassTy && 1489 "Forward metaclass reference has incorrect type."); 1490 GV->setLinkage(llvm::GlobalValue::InternalLinkage); 1491 GV->setInitializer(Init); 1492 } else { 1493 GV = new llvm::GlobalVariable(ObjCTypes.ClassTy, false, 1494 llvm::GlobalValue::InternalLinkage, 1495 Init, Name, 1496 &CGM.getModule()); 1497 } 1498 GV->setSection("__OBJC,__meta_class,regular,no_dead_strip"); 1499 UsedGlobals.push_back(GV); 1500 // FIXME: Why? 1501 GV->setAlignment(32); 1502 1503 return GV; 1504} 1505 1506llvm::Constant *CGObjCMac::EmitMetaClassRef(const ObjCInterfaceDecl *ID) { 1507 std::string Name = "\01L_OBJC_METACLASS_" + ID->getNameAsString(); 1508 1509 // FIXME: Should we look these up somewhere other than the 1510 // module. Its a bit silly since we only generate these while 1511 // processing an implementation, so exactly one pointer would work 1512 // if know when we entered/exitted an implementation block. 1513 1514 // Check for an existing forward reference. 1515 // Previously, metaclass with internal linkage may have been defined. 1516 // pass 'true' as 2nd argument so it is returned. 1517 if (llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name, true)) { 1518 assert(GV->getType()->getElementType() == ObjCTypes.ClassTy && 1519 "Forward metaclass reference has incorrect type."); 1520 return GV; 1521 } else { 1522 // Generate as an external reference to keep a consistent 1523 // module. This will be patched up when we emit the metaclass. 1524 return new llvm::GlobalVariable(ObjCTypes.ClassTy, false, 1525 llvm::GlobalValue::ExternalLinkage, 1526 0, 1527 Name, 1528 &CGM.getModule()); 1529 } 1530} 1531 1532/* 1533 struct objc_class_ext { 1534 uint32_t size; 1535 const char *weak_ivar_layout; 1536 struct _objc_property_list *properties; 1537 }; 1538*/ 1539llvm::Constant * 1540CGObjCMac::EmitClassExtension(const ObjCImplementationDecl *ID) { 1541 uint64_t Size = 1542 CGM.getTargetData().getTypePaddedSize(ObjCTypes.ClassExtensionTy); 1543 1544 std::vector<llvm::Constant*> Values(3); 1545 Values[0] = llvm::ConstantInt::get(ObjCTypes.IntTy, Size); 1546 // FIXME: Output weak_ivar_layout string. 1547 Values[1] = llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy); 1548 Values[2] = EmitPropertyList("\01L_OBJC_$_PROP_LIST_" + ID->getNameAsString(), 1549 ID, ID->getClassInterface(), ObjCTypes); 1550 1551 // Return null if no extension bits are used. 1552 if (Values[1]->isNullValue() && Values[2]->isNullValue()) 1553 return llvm::Constant::getNullValue(ObjCTypes.ClassExtensionPtrTy); 1554 1555 llvm::Constant *Init = 1556 llvm::ConstantStruct::get(ObjCTypes.ClassExtensionTy, Values); 1557 llvm::GlobalVariable *GV = 1558 new llvm::GlobalVariable(ObjCTypes.ClassExtensionTy, false, 1559 llvm::GlobalValue::InternalLinkage, 1560 Init, 1561 "\01L_OBJC_CLASSEXT_" + ID->getNameAsString(), 1562 &CGM.getModule()); 1563 // No special section, but goes in llvm.used 1564 UsedGlobals.push_back(GV); 1565 1566 return GV; 1567} 1568 1569/// countInheritedIvars - count number of ivars in class and its super class(s) 1570/// 1571static int countInheritedIvars(const ObjCInterfaceDecl *OI) { 1572 int count = 0; 1573 if (!OI) 1574 return 0; 1575 const ObjCInterfaceDecl *SuperClass = OI->getSuperClass(); 1576 if (SuperClass) 1577 count += countInheritedIvars(SuperClass); 1578 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 1579 E = OI->ivar_end(); I != E; ++I) 1580 ++count; 1581 return count; 1582} 1583 1584/* 1585 struct objc_ivar { 1586 char *ivar_name; 1587 char *ivar_type; 1588 int ivar_offset; 1589 }; 1590 1591 struct objc_ivar_list { 1592 int ivar_count; 1593 struct objc_ivar list[count]; 1594 }; 1595 */ 1596llvm::Constant *CGObjCMac::EmitIvarList(const ObjCImplementationDecl *ID, 1597 bool ForClass) { 1598 std::vector<llvm::Constant*> Ivars, Ivar(3); 1599 1600 // When emitting the root class GCC emits ivar entries for the 1601 // actual class structure. It is not clear if we need to follow this 1602 // behavior; for now lets try and get away with not doing it. If so, 1603 // the cleanest solution would be to make up an ObjCInterfaceDecl 1604 // for the class. 1605 if (ForClass) 1606 return llvm::Constant::getNullValue(ObjCTypes.IvarListPtrTy); 1607 1608 ObjCInterfaceDecl *OID = 1609 const_cast<ObjCInterfaceDecl*>(ID->getClassInterface()); 1610 const llvm::Type *InterfaceTy = 1611 CGM.getTypes().ConvertType(CGM.getContext().getObjCInterfaceType(OID)); 1612 const llvm::StructLayout *Layout = 1613 CGM.getTargetData().getStructLayout(cast<llvm::StructType>(InterfaceTy)); 1614 1615 RecordDecl::field_iterator ifield, pfield; 1616 const RecordDecl *RD = GetFirstIvarInRecord(OID, ifield, pfield); 1617 for (RecordDecl::field_iterator e = RD->field_end(); ifield != e; ++ifield) { 1618 FieldDecl *Field = *ifield; 1619 unsigned Offset = Layout->getElementOffset(CGM.getTypes(). 1620 getLLVMFieldNo(Field)); 1621 if (Field->getIdentifier()) 1622 Ivar[0] = GetMethodVarName(Field->getIdentifier()); 1623 else 1624 Ivar[0] = llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy); 1625 std::string TypeStr; 1626 CGM.getContext().getObjCEncodingForType(Field->getType(), TypeStr, Field); 1627 Ivar[1] = GetMethodVarType(TypeStr); 1628 Ivar[2] = llvm::ConstantInt::get(ObjCTypes.IntTy, Offset); 1629 Ivars.push_back(llvm::ConstantStruct::get(ObjCTypes.IvarTy, Ivar)); 1630 } 1631 1632 // Return null for empty list. 1633 if (Ivars.empty()) 1634 return llvm::Constant::getNullValue(ObjCTypes.IvarListPtrTy); 1635 1636 std::vector<llvm::Constant*> Values(2); 1637 Values[0] = llvm::ConstantInt::get(ObjCTypes.IntTy, Ivars.size()); 1638 llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.IvarTy, 1639 Ivars.size()); 1640 Values[1] = llvm::ConstantArray::get(AT, Ivars); 1641 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 1642 1643 const char *Prefix = (ForClass ? "\01L_OBJC_CLASS_VARIABLES_" : 1644 "\01L_OBJC_INSTANCE_VARIABLES_"); 1645 llvm::GlobalVariable *GV = 1646 new llvm::GlobalVariable(Init->getType(), false, 1647 llvm::GlobalValue::InternalLinkage, 1648 Init, 1649 Prefix + ID->getNameAsString(), 1650 &CGM.getModule()); 1651 if (ForClass) { 1652 GV->setSection("__OBJC,__cls_vars,regular,no_dead_strip"); 1653 // FIXME: Why is this only here? 1654 GV->setAlignment(32); 1655 } else { 1656 GV->setSection("__OBJC,__instance_vars,regular,no_dead_strip"); 1657 } 1658 UsedGlobals.push_back(GV); 1659 return llvm::ConstantExpr::getBitCast(GV, 1660 ObjCTypes.IvarListPtrTy); 1661} 1662 1663/* 1664 struct objc_method { 1665 SEL method_name; 1666 char *method_types; 1667 void *method; 1668 }; 1669 1670 struct objc_method_list { 1671 struct objc_method_list *obsolete; 1672 int count; 1673 struct objc_method methods_list[count]; 1674 }; 1675*/ 1676 1677/// GetMethodConstant - Return a struct objc_method constant for the 1678/// given method if it has been defined. The result is null if the 1679/// method has not been defined. The return value has type MethodPtrTy. 1680llvm::Constant *CGObjCMac::GetMethodConstant(const ObjCMethodDecl *MD) { 1681 // FIXME: Use DenseMap::lookup 1682 llvm::Function *Fn = MethodDefinitions[MD]; 1683 if (!Fn) 1684 return 0; 1685 1686 std::vector<llvm::Constant*> Method(3); 1687 Method[0] = 1688 llvm::ConstantExpr::getBitCast(GetMethodVarName(MD->getSelector()), 1689 ObjCTypes.SelectorPtrTy); 1690 Method[1] = GetMethodVarType(MD); 1691 Method[2] = llvm::ConstantExpr::getBitCast(Fn, ObjCTypes.Int8PtrTy); 1692 return llvm::ConstantStruct::get(ObjCTypes.MethodTy, Method); 1693} 1694 1695llvm::Constant *CGObjCMac::EmitMethodList(const std::string &Name, 1696 const char *Section, 1697 const ConstantVector &Methods) { 1698 // Return null for empty list. 1699 if (Methods.empty()) 1700 return llvm::Constant::getNullValue(ObjCTypes.MethodListPtrTy); 1701 1702 std::vector<llvm::Constant*> Values(3); 1703 Values[0] = llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy); 1704 Values[1] = llvm::ConstantInt::get(ObjCTypes.IntTy, Methods.size()); 1705 llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.MethodTy, 1706 Methods.size()); 1707 Values[2] = llvm::ConstantArray::get(AT, Methods); 1708 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 1709 1710 llvm::GlobalVariable *GV = 1711 new llvm::GlobalVariable(Init->getType(), false, 1712 llvm::GlobalValue::InternalLinkage, 1713 Init, 1714 Name, 1715 &CGM.getModule()); 1716 GV->setSection(Section); 1717 UsedGlobals.push_back(GV); 1718 return llvm::ConstantExpr::getBitCast(GV, 1719 ObjCTypes.MethodListPtrTy); 1720} 1721 1722llvm::Function *CGObjCCommonMac::GenerateMethod(const ObjCMethodDecl *OMD, 1723 const ObjCContainerDecl *CD) { 1724 std::string Name; 1725 GetNameForMethod(OMD, CD, Name); 1726 1727 CodeGenTypes &Types = CGM.getTypes(); 1728 const llvm::FunctionType *MethodTy = 1729 Types.GetFunctionType(Types.getFunctionInfo(OMD), OMD->isVariadic()); 1730 llvm::Function *Method = 1731 llvm::Function::Create(MethodTy, 1732 llvm::GlobalValue::InternalLinkage, 1733 Name, 1734 &CGM.getModule()); 1735 MethodDefinitions.insert(std::make_pair(OMD, Method)); 1736 1737 return Method; 1738} 1739 1740llvm::Function *CGObjCMac::ModuleInitFunction() { 1741 // Abuse this interface function as a place to finalize. 1742 FinishModule(); 1743 1744 return NULL; 1745} 1746 1747llvm::Function *CGObjCMac::GetPropertyGetFunction() { 1748 return ObjCTypes.GetPropertyFn; 1749} 1750 1751llvm::Function *CGObjCMac::GetPropertySetFunction() { 1752 return ObjCTypes.SetPropertyFn; 1753} 1754 1755llvm::Function *CGObjCMac::EnumerationMutationFunction() 1756{ 1757 return ObjCTypes.EnumerationMutationFn; 1758} 1759 1760/* 1761 1762Objective-C setjmp-longjmp (sjlj) Exception Handling 1763-- 1764 1765The basic framework for a @try-catch-finally is as follows: 1766{ 1767 objc_exception_data d; 1768 id _rethrow = null; 1769 bool _call_try_exit = true; 1770 1771 objc_exception_try_enter(&d); 1772 if (!setjmp(d.jmp_buf)) { 1773 ... try body ... 1774 } else { 1775 // exception path 1776 id _caught = objc_exception_extract(&d); 1777 1778 // enter new try scope for handlers 1779 if (!setjmp(d.jmp_buf)) { 1780 ... match exception and execute catch blocks ... 1781 1782 // fell off end, rethrow. 1783 _rethrow = _caught; 1784 ... jump-through-finally to finally_rethrow ... 1785 } else { 1786 // exception in catch block 1787 _rethrow = objc_exception_extract(&d); 1788 _call_try_exit = false; 1789 ... jump-through-finally to finally_rethrow ... 1790 } 1791 } 1792 ... jump-through-finally to finally_end ... 1793 1794finally: 1795 if (_call_try_exit) 1796 objc_exception_try_exit(&d); 1797 1798 ... finally block .... 1799 ... dispatch to finally destination ... 1800 1801finally_rethrow: 1802 objc_exception_throw(_rethrow); 1803 1804finally_end: 1805} 1806 1807This framework differs slightly from the one gcc uses, in that gcc 1808uses _rethrow to determine if objc_exception_try_exit should be called 1809and if the object should be rethrown. This breaks in the face of 1810throwing nil and introduces unnecessary branches. 1811 1812We specialize this framework for a few particular circumstances: 1813 1814 - If there are no catch blocks, then we avoid emitting the second 1815 exception handling context. 1816 1817 - If there is a catch-all catch block (i.e. @catch(...) or @catch(id 1818 e)) we avoid emitting the code to rethrow an uncaught exception. 1819 1820 - FIXME: If there is no @finally block we can do a few more 1821 simplifications. 1822 1823Rethrows and Jumps-Through-Finally 1824-- 1825 1826Support for implicit rethrows and jumping through the finally block is 1827handled by storing the current exception-handling context in 1828ObjCEHStack. 1829 1830In order to implement proper @finally semantics, we support one basic 1831mechanism for jumping through the finally block to an arbitrary 1832destination. Constructs which generate exits from a @try or @catch 1833block use this mechanism to implement the proper semantics by chaining 1834jumps, as necessary. 1835 1836This mechanism works like the one used for indirect goto: we 1837arbitrarily assign an ID to each destination and store the ID for the 1838destination in a variable prior to entering the finally block. At the 1839end of the finally block we simply create a switch to the proper 1840destination. 1841 1842Code gen for @synchronized(expr) stmt; 1843Effectively generating code for: 1844objc_sync_enter(expr); 1845@try stmt @finally { objc_sync_exit(expr); } 1846*/ 1847 1848void CGObjCMac::EmitTryOrSynchronizedStmt(CodeGen::CodeGenFunction &CGF, 1849 const Stmt &S) { 1850 bool isTry = isa<ObjCAtTryStmt>(S); 1851 // Create various blocks we refer to for handling @finally. 1852 llvm::BasicBlock *FinallyBlock = CGF.createBasicBlock("finally"); 1853 llvm::BasicBlock *FinallyExit = CGF.createBasicBlock("finally.exit"); 1854 llvm::BasicBlock *FinallyNoExit = CGF.createBasicBlock("finally.noexit"); 1855 llvm::BasicBlock *FinallyRethrow = CGF.createBasicBlock("finally.throw"); 1856 llvm::BasicBlock *FinallyEnd = CGF.createBasicBlock("finally.end"); 1857 1858 // Push an EH context entry, used for handling rethrows and jumps 1859 // through finally. 1860 CGF.PushCleanupBlock(FinallyBlock); 1861 1862 CGF.ObjCEHValueStack.push_back(0); 1863 1864 // Allocate memory for the exception data and rethrow pointer. 1865 llvm::Value *ExceptionData = CGF.CreateTempAlloca(ObjCTypes.ExceptionDataTy, 1866 "exceptiondata.ptr"); 1867 llvm::Value *RethrowPtr = CGF.CreateTempAlloca(ObjCTypes.ObjectPtrTy, 1868 "_rethrow"); 1869 llvm::Value *CallTryExitPtr = CGF.CreateTempAlloca(llvm::Type::Int1Ty, 1870 "_call_try_exit"); 1871 CGF.Builder.CreateStore(llvm::ConstantInt::getTrue(), CallTryExitPtr); 1872 1873 if (!isTry) { 1874 // For @synchronized, call objc_sync_enter(sync.expr) 1875 llvm::Value *Arg = CGF.EmitScalarExpr( 1876 cast<ObjCAtSynchronizedStmt>(S).getSynchExpr()); 1877 Arg = CGF.Builder.CreateBitCast(Arg, ObjCTypes.ObjectPtrTy); 1878 CGF.Builder.CreateCall(ObjCTypes.SyncEnterFn, Arg); 1879 } 1880 1881 // Enter a new try block and call setjmp. 1882 CGF.Builder.CreateCall(ObjCTypes.ExceptionTryEnterFn, ExceptionData); 1883 llvm::Value *JmpBufPtr = CGF.Builder.CreateStructGEP(ExceptionData, 0, 1884 "jmpbufarray"); 1885 JmpBufPtr = CGF.Builder.CreateStructGEP(JmpBufPtr, 0, "tmp"); 1886 llvm::Value *SetJmpResult = CGF.Builder.CreateCall(ObjCTypes.SetJmpFn, 1887 JmpBufPtr, "result"); 1888 1889 llvm::BasicBlock *TryBlock = CGF.createBasicBlock("try"); 1890 llvm::BasicBlock *TryHandler = CGF.createBasicBlock("try.handler"); 1891 CGF.Builder.CreateCondBr(CGF.Builder.CreateIsNotNull(SetJmpResult, "threw"), 1892 TryHandler, TryBlock); 1893 1894 // Emit the @try block. 1895 CGF.EmitBlock(TryBlock); 1896 CGF.EmitStmt(isTry ? cast<ObjCAtTryStmt>(S).getTryBody() 1897 : cast<ObjCAtSynchronizedStmt>(S).getSynchBody()); 1898 CGF.EmitBranchThroughCleanup(FinallyEnd); 1899 1900 // Emit the "exception in @try" block. 1901 CGF.EmitBlock(TryHandler); 1902 1903 // Retrieve the exception object. We may emit multiple blocks but 1904 // nothing can cross this so the value is already in SSA form. 1905 llvm::Value *Caught = CGF.Builder.CreateCall(ObjCTypes.ExceptionExtractFn, 1906 ExceptionData, 1907 "caught"); 1908 CGF.ObjCEHValueStack.back() = Caught; 1909 if (!isTry) 1910 { 1911 CGF.Builder.CreateStore(Caught, RethrowPtr); 1912 CGF.Builder.CreateStore(llvm::ConstantInt::getFalse(), CallTryExitPtr); 1913 CGF.EmitBranchThroughCleanup(FinallyRethrow); 1914 } 1915 else if (const ObjCAtCatchStmt* CatchStmt = 1916 cast<ObjCAtTryStmt>(S).getCatchStmts()) 1917 { 1918 // Enter a new exception try block (in case a @catch block throws 1919 // an exception). 1920 CGF.Builder.CreateCall(ObjCTypes.ExceptionTryEnterFn, ExceptionData); 1921 1922 llvm::Value *SetJmpResult = CGF.Builder.CreateCall(ObjCTypes.SetJmpFn, 1923 JmpBufPtr, "result"); 1924 llvm::Value *Threw = CGF.Builder.CreateIsNotNull(SetJmpResult, "threw"); 1925 1926 llvm::BasicBlock *CatchBlock = CGF.createBasicBlock("catch"); 1927 llvm::BasicBlock *CatchHandler = CGF.createBasicBlock("catch.handler"); 1928 CGF.Builder.CreateCondBr(Threw, CatchHandler, CatchBlock); 1929 1930 CGF.EmitBlock(CatchBlock); 1931 1932 // Handle catch list. As a special case we check if everything is 1933 // matched and avoid generating code for falling off the end if 1934 // so. 1935 bool AllMatched = false; 1936 for (; CatchStmt; CatchStmt = CatchStmt->getNextCatchStmt()) { 1937 llvm::BasicBlock *NextCatchBlock = CGF.createBasicBlock("catch"); 1938 1939 const DeclStmt *CatchParam = 1940 cast_or_null<DeclStmt>(CatchStmt->getCatchParamStmt()); 1941 const VarDecl *VD = 0; 1942 const PointerType *PT = 0; 1943 1944 // catch(...) always matches. 1945 if (!CatchParam) { 1946 AllMatched = true; 1947 } else { 1948 VD = cast<VarDecl>(CatchParam->getSolitaryDecl()); 1949 PT = VD->getType()->getAsPointerType(); 1950 1951 // catch(id e) always matches. 1952 // FIXME: For the time being we also match id<X>; this should 1953 // be rejected by Sema instead. 1954 if ((PT && CGF.getContext().isObjCIdType(PT->getPointeeType())) || 1955 VD->getType()->isObjCQualifiedIdType()) 1956 AllMatched = true; 1957 } 1958 1959 if (AllMatched) { 1960 if (CatchParam) { 1961 CGF.EmitStmt(CatchParam); 1962 assert(CGF.HaveInsertPoint() && "DeclStmt destroyed insert point?"); 1963 CGF.Builder.CreateStore(Caught, CGF.GetAddrOfLocalVar(VD)); 1964 } 1965 1966 CGF.EmitStmt(CatchStmt->getCatchBody()); 1967 CGF.EmitBranchThroughCleanup(FinallyEnd); 1968 break; 1969 } 1970 1971 assert(PT && "Unexpected non-pointer type in @catch"); 1972 QualType T = PT->getPointeeType(); 1973 const ObjCInterfaceType *ObjCType = T->getAsObjCInterfaceType(); 1974 assert(ObjCType && "Catch parameter must have Objective-C type!"); 1975 1976 // Check if the @catch block matches the exception object. 1977 llvm::Value *Class = EmitClassRef(CGF.Builder, ObjCType->getDecl()); 1978 1979 llvm::Value *Match = CGF.Builder.CreateCall2(ObjCTypes.ExceptionMatchFn, 1980 Class, Caught, "match"); 1981 1982 llvm::BasicBlock *MatchedBlock = CGF.createBasicBlock("matched"); 1983 1984 CGF.Builder.CreateCondBr(CGF.Builder.CreateIsNotNull(Match, "matched"), 1985 MatchedBlock, NextCatchBlock); 1986 1987 // Emit the @catch block. 1988 CGF.EmitBlock(MatchedBlock); 1989 CGF.EmitStmt(CatchParam); 1990 assert(CGF.HaveInsertPoint() && "DeclStmt destroyed insert point?"); 1991 1992 llvm::Value *Tmp = 1993 CGF.Builder.CreateBitCast(Caught, CGF.ConvertType(VD->getType()), 1994 "tmp"); 1995 CGF.Builder.CreateStore(Tmp, CGF.GetAddrOfLocalVar(VD)); 1996 1997 CGF.EmitStmt(CatchStmt->getCatchBody()); 1998 CGF.EmitBranchThroughCleanup(FinallyEnd); 1999 2000 CGF.EmitBlock(NextCatchBlock); 2001 } 2002 2003 if (!AllMatched) { 2004 // None of the handlers caught the exception, so store it to be 2005 // rethrown at the end of the @finally block. 2006 CGF.Builder.CreateStore(Caught, RethrowPtr); 2007 CGF.EmitBranchThroughCleanup(FinallyRethrow); 2008 } 2009 2010 // Emit the exception handler for the @catch blocks. 2011 CGF.EmitBlock(CatchHandler); 2012 CGF.Builder.CreateStore(CGF.Builder.CreateCall(ObjCTypes.ExceptionExtractFn, 2013 ExceptionData), 2014 RethrowPtr); 2015 CGF.Builder.CreateStore(llvm::ConstantInt::getFalse(), CallTryExitPtr); 2016 CGF.EmitBranchThroughCleanup(FinallyRethrow); 2017 } else { 2018 CGF.Builder.CreateStore(Caught, RethrowPtr); 2019 CGF.Builder.CreateStore(llvm::ConstantInt::getFalse(), CallTryExitPtr); 2020 CGF.EmitBranchThroughCleanup(FinallyRethrow); 2021 } 2022 2023 // Pop the exception-handling stack entry. It is important to do 2024 // this now, because the code in the @finally block is not in this 2025 // context. 2026 CodeGenFunction::CleanupBlockInfo Info = CGF.PopCleanupBlock(); 2027 2028 CGF.ObjCEHValueStack.pop_back(); 2029 2030 // Emit the @finally block. 2031 CGF.EmitBlock(FinallyBlock); 2032 llvm::Value* CallTryExit = CGF.Builder.CreateLoad(CallTryExitPtr, "tmp"); 2033 2034 CGF.Builder.CreateCondBr(CallTryExit, FinallyExit, FinallyNoExit); 2035 2036 CGF.EmitBlock(FinallyExit); 2037 CGF.Builder.CreateCall(ObjCTypes.ExceptionTryExitFn, ExceptionData); 2038 2039 CGF.EmitBlock(FinallyNoExit); 2040 if (isTry) { 2041 if (const ObjCAtFinallyStmt* FinallyStmt = 2042 cast<ObjCAtTryStmt>(S).getFinallyStmt()) 2043 CGF.EmitStmt(FinallyStmt->getFinallyBody()); 2044 } 2045 else { 2046 // For @synchronized objc_sync_exit(expr); As finally's sole statement. 2047 // For @synchronized, call objc_sync_enter(sync.expr) 2048 llvm::Value *Arg = CGF.EmitScalarExpr( 2049 cast<ObjCAtSynchronizedStmt>(S).getSynchExpr()); 2050 Arg = CGF.Builder.CreateBitCast(Arg, ObjCTypes.ObjectPtrTy); 2051 CGF.Builder.CreateCall(ObjCTypes.SyncExitFn, Arg); 2052 } 2053 2054 // Emit the switch block 2055 if (Info.SwitchBlock) 2056 CGF.EmitBlock(Info.SwitchBlock); 2057 if (Info.EndBlock) 2058 CGF.EmitBlock(Info.EndBlock); 2059 2060 CGF.EmitBlock(FinallyRethrow); 2061 CGF.Builder.CreateCall(ObjCTypes.ExceptionThrowFn, 2062 CGF.Builder.CreateLoad(RethrowPtr)); 2063 CGF.Builder.CreateUnreachable(); 2064 2065 CGF.EmitBlock(FinallyEnd); 2066} 2067 2068void CGObjCMac::EmitThrowStmt(CodeGen::CodeGenFunction &CGF, 2069 const ObjCAtThrowStmt &S) { 2070 llvm::Value *ExceptionAsObject; 2071 2072 if (const Expr *ThrowExpr = S.getThrowExpr()) { 2073 llvm::Value *Exception = CGF.EmitScalarExpr(ThrowExpr); 2074 ExceptionAsObject = 2075 CGF.Builder.CreateBitCast(Exception, ObjCTypes.ObjectPtrTy, "tmp"); 2076 } else { 2077 assert((!CGF.ObjCEHValueStack.empty() && CGF.ObjCEHValueStack.back()) && 2078 "Unexpected rethrow outside @catch block."); 2079 ExceptionAsObject = CGF.ObjCEHValueStack.back(); 2080 } 2081 2082 CGF.Builder.CreateCall(ObjCTypes.ExceptionThrowFn, ExceptionAsObject); 2083 CGF.Builder.CreateUnreachable(); 2084 2085 // Clear the insertion point to indicate we are in unreachable code. 2086 CGF.Builder.ClearInsertionPoint(); 2087} 2088 2089/// EmitObjCWeakRead - Code gen for loading value of a __weak 2090/// object: objc_read_weak (id *src) 2091/// 2092llvm::Value * CGObjCMac::EmitObjCWeakRead(CodeGen::CodeGenFunction &CGF, 2093 llvm::Value *AddrWeakObj) 2094{ 2095 AddrWeakObj = CGF.Builder.CreateBitCast(AddrWeakObj, ObjCTypes.PtrObjectPtrTy); 2096 llvm::Value *read_weak = CGF.Builder.CreateCall(ObjCTypes.GcReadWeakFn, 2097 AddrWeakObj, "weakread"); 2098 return read_weak; 2099} 2100 2101/// EmitObjCWeakAssign - Code gen for assigning to a __weak object. 2102/// objc_assign_weak (id src, id *dst) 2103/// 2104void CGObjCMac::EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF, 2105 llvm::Value *src, llvm::Value *dst) 2106{ 2107 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy); 2108 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy); 2109 CGF.Builder.CreateCall2(ObjCTypes.GcAssignWeakFn, 2110 src, dst, "weakassign"); 2111 return; 2112} 2113 2114/// EmitObjCGlobalAssign - Code gen for assigning to a __strong object. 2115/// objc_assign_global (id src, id *dst) 2116/// 2117void CGObjCMac::EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF, 2118 llvm::Value *src, llvm::Value *dst) 2119{ 2120 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy); 2121 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy); 2122 CGF.Builder.CreateCall2(ObjCTypes.GcAssignGlobalFn, 2123 src, dst, "globalassign"); 2124 return; 2125} 2126 2127/// EmitObjCIvarAssign - Code gen for assigning to a __strong object. 2128/// objc_assign_ivar (id src, id *dst) 2129/// 2130void CGObjCMac::EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF, 2131 llvm::Value *src, llvm::Value *dst) 2132{ 2133 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy); 2134 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy); 2135 CGF.Builder.CreateCall2(ObjCTypes.GcAssignIvarFn, 2136 src, dst, "assignivar"); 2137 return; 2138} 2139 2140/// EmitObjCStrongCastAssign - Code gen for assigning to a __strong cast object. 2141/// objc_assign_strongCast (id src, id *dst) 2142/// 2143void CGObjCMac::EmitObjCStrongCastAssign(CodeGen::CodeGenFunction &CGF, 2144 llvm::Value *src, llvm::Value *dst) 2145{ 2146 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy); 2147 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy); 2148 CGF.Builder.CreateCall2(ObjCTypes.GcAssignStrongCastFn, 2149 src, dst, "weakassign"); 2150 return; 2151} 2152 2153/// EmitObjCValueForIvar - Code Gen for ivar reference. 2154/// 2155LValue CGObjCMac::EmitObjCValueForIvar(CodeGen::CodeGenFunction &CGF, 2156 QualType ObjectTy, 2157 llvm::Value *BaseValue, 2158 const ObjCIvarDecl *Ivar, 2159 const FieldDecl *Field, 2160 unsigned CVRQualifiers) { 2161 if (Ivar->isBitField()) 2162 return CGF.EmitLValueForBitfield(BaseValue, const_cast<FieldDecl *>(Field), 2163 CVRQualifiers); 2164 // TODO: Add a special case for isa (index 0) 2165 unsigned Index = CGM.getTypes().getLLVMFieldNo(Field); 2166 llvm::Value *V = CGF.Builder.CreateStructGEP(BaseValue, Index, "tmp"); 2167 LValue LV = LValue::MakeAddr(V, 2168 Ivar->getType().getCVRQualifiers()|CVRQualifiers); 2169 LValue::SetObjCIvar(LV, true); 2170 return LV; 2171} 2172 2173/* *** Private Interface *** */ 2174 2175/// EmitImageInfo - Emit the image info marker used to encode some module 2176/// level information. 2177/// 2178/// See: <rdr://4810609&4810587&4810587> 2179/// struct IMAGE_INFO { 2180/// unsigned version; 2181/// unsigned flags; 2182/// }; 2183enum ImageInfoFlags { 2184 eImageInfo_FixAndContinue = (1 << 0), // FIXME: Not sure what this implies 2185 eImageInfo_GarbageCollected = (1 << 1), 2186 eImageInfo_GCOnly = (1 << 2) 2187}; 2188 2189void CGObjCMac::EmitImageInfo() { 2190 unsigned version = 0; // Version is unused? 2191 unsigned flags = 0; 2192 2193 // FIXME: Fix and continue? 2194 if (CGM.getLangOptions().getGCMode() != LangOptions::NonGC) 2195 flags |= eImageInfo_GarbageCollected; 2196 if (CGM.getLangOptions().getGCMode() == LangOptions::GCOnly) 2197 flags |= eImageInfo_GCOnly; 2198 2199 // Emitted as int[2]; 2200 llvm::Constant *values[2] = { 2201 llvm::ConstantInt::get(llvm::Type::Int32Ty, version), 2202 llvm::ConstantInt::get(llvm::Type::Int32Ty, flags) 2203 }; 2204 llvm::ArrayType *AT = llvm::ArrayType::get(llvm::Type::Int32Ty, 2); 2205 llvm::GlobalVariable *GV = 2206 new llvm::GlobalVariable(AT, true, 2207 llvm::GlobalValue::InternalLinkage, 2208 llvm::ConstantArray::get(AT, values, 2), 2209 "\01L_OBJC_IMAGE_INFO", 2210 &CGM.getModule()); 2211 2212 if (ObjCABI == 1) { 2213 GV->setSection("__OBJC, __image_info,regular"); 2214 } else { 2215 GV->setSection("__DATA, __objc_imageinfo, regular, no_dead_strip"); 2216 } 2217 2218 UsedGlobals.push_back(GV); 2219} 2220 2221 2222// struct objc_module { 2223// unsigned long version; 2224// unsigned long size; 2225// const char *name; 2226// Symtab symtab; 2227// }; 2228 2229// FIXME: Get from somewhere 2230static const int ModuleVersion = 7; 2231 2232void CGObjCMac::EmitModuleInfo() { 2233 uint64_t Size = CGM.getTargetData().getTypePaddedSize(ObjCTypes.ModuleTy); 2234 2235 std::vector<llvm::Constant*> Values(4); 2236 Values[0] = llvm::ConstantInt::get(ObjCTypes.LongTy, ModuleVersion); 2237 Values[1] = llvm::ConstantInt::get(ObjCTypes.LongTy, Size); 2238 // This used to be the filename, now it is unused. <rdr://4327263> 2239 Values[2] = GetClassName(&CGM.getContext().Idents.get("")); 2240 Values[3] = EmitModuleSymbols(); 2241 2242 llvm::GlobalVariable *GV = 2243 new llvm::GlobalVariable(ObjCTypes.ModuleTy, false, 2244 llvm::GlobalValue::InternalLinkage, 2245 llvm::ConstantStruct::get(ObjCTypes.ModuleTy, 2246 Values), 2247 "\01L_OBJC_MODULES", 2248 &CGM.getModule()); 2249 GV->setSection("__OBJC,__module_info,regular,no_dead_strip"); 2250 UsedGlobals.push_back(GV); 2251} 2252 2253llvm::Constant *CGObjCMac::EmitModuleSymbols() { 2254 unsigned NumClasses = DefinedClasses.size(); 2255 unsigned NumCategories = DefinedCategories.size(); 2256 2257 // Return null if no symbols were defined. 2258 if (!NumClasses && !NumCategories) 2259 return llvm::Constant::getNullValue(ObjCTypes.SymtabPtrTy); 2260 2261 std::vector<llvm::Constant*> Values(5); 2262 Values[0] = llvm::ConstantInt::get(ObjCTypes.LongTy, 0); 2263 Values[1] = llvm::Constant::getNullValue(ObjCTypes.SelectorPtrTy); 2264 Values[2] = llvm::ConstantInt::get(ObjCTypes.ShortTy, NumClasses); 2265 Values[3] = llvm::ConstantInt::get(ObjCTypes.ShortTy, NumCategories); 2266 2267 // The runtime expects exactly the list of defined classes followed 2268 // by the list of defined categories, in a single array. 2269 std::vector<llvm::Constant*> Symbols(NumClasses + NumCategories); 2270 for (unsigned i=0; i<NumClasses; i++) 2271 Symbols[i] = llvm::ConstantExpr::getBitCast(DefinedClasses[i], 2272 ObjCTypes.Int8PtrTy); 2273 for (unsigned i=0; i<NumCategories; i++) 2274 Symbols[NumClasses + i] = 2275 llvm::ConstantExpr::getBitCast(DefinedCategories[i], 2276 ObjCTypes.Int8PtrTy); 2277 2278 Values[4] = 2279 llvm::ConstantArray::get(llvm::ArrayType::get(ObjCTypes.Int8PtrTy, 2280 NumClasses + NumCategories), 2281 Symbols); 2282 2283 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 2284 2285 llvm::GlobalVariable *GV = 2286 new llvm::GlobalVariable(Init->getType(), false, 2287 llvm::GlobalValue::InternalLinkage, 2288 Init, 2289 "\01L_OBJC_SYMBOLS", 2290 &CGM.getModule()); 2291 GV->setSection("__OBJC,__symbols,regular,no_dead_strip"); 2292 UsedGlobals.push_back(GV); 2293 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.SymtabPtrTy); 2294} 2295 2296llvm::Value *CGObjCMac::EmitClassRef(CGBuilderTy &Builder, 2297 const ObjCInterfaceDecl *ID) { 2298 LazySymbols.insert(ID->getIdentifier()); 2299 2300 llvm::GlobalVariable *&Entry = ClassReferences[ID->getIdentifier()]; 2301 2302 if (!Entry) { 2303 llvm::Constant *Casted = 2304 llvm::ConstantExpr::getBitCast(GetClassName(ID->getIdentifier()), 2305 ObjCTypes.ClassPtrTy); 2306 Entry = 2307 new llvm::GlobalVariable(ObjCTypes.ClassPtrTy, false, 2308 llvm::GlobalValue::InternalLinkage, 2309 Casted, "\01L_OBJC_CLASS_REFERENCES_", 2310 &CGM.getModule()); 2311 Entry->setSection("__OBJC,__cls_refs,literal_pointers,no_dead_strip"); 2312 UsedGlobals.push_back(Entry); 2313 } 2314 2315 return Builder.CreateLoad(Entry, false, "tmp"); 2316} 2317 2318llvm::Value *CGObjCMac::EmitSelector(CGBuilderTy &Builder, Selector Sel) { 2319 llvm::GlobalVariable *&Entry = SelectorReferences[Sel]; 2320 2321 if (!Entry) { 2322 llvm::Constant *Casted = 2323 llvm::ConstantExpr::getBitCast(GetMethodVarName(Sel), 2324 ObjCTypes.SelectorPtrTy); 2325 Entry = 2326 new llvm::GlobalVariable(ObjCTypes.SelectorPtrTy, false, 2327 llvm::GlobalValue::InternalLinkage, 2328 Casted, "\01L_OBJC_SELECTOR_REFERENCES_", 2329 &CGM.getModule()); 2330 Entry->setSection("__OBJC,__message_refs,literal_pointers,no_dead_strip"); 2331 UsedGlobals.push_back(Entry); 2332 } 2333 2334 return Builder.CreateLoad(Entry, false, "tmp"); 2335} 2336 2337llvm::Constant *CGObjCCommonMac::GetClassName(IdentifierInfo *Ident) { 2338 llvm::GlobalVariable *&Entry = ClassNames[Ident]; 2339 2340 if (!Entry) { 2341 llvm::Constant *C = llvm::ConstantArray::get(Ident->getName()); 2342 Entry = 2343 new llvm::GlobalVariable(C->getType(), false, 2344 llvm::GlobalValue::InternalLinkage, 2345 C, "\01L_OBJC_CLASS_NAME_", 2346 &CGM.getModule()); 2347 Entry->setSection("__TEXT,__cstring,cstring_literals"); 2348 UsedGlobals.push_back(Entry); 2349 } 2350 2351 return getConstantGEP(Entry, 0, 0); 2352} 2353 2354llvm::Constant *CGObjCCommonMac::GetMethodVarName(Selector Sel) { 2355 llvm::GlobalVariable *&Entry = MethodVarNames[Sel]; 2356 2357 if (!Entry) { 2358 // FIXME: Avoid std::string copying. 2359 llvm::Constant *C = llvm::ConstantArray::get(Sel.getAsString()); 2360 Entry = 2361 new llvm::GlobalVariable(C->getType(), false, 2362 llvm::GlobalValue::InternalLinkage, 2363 C, "\01L_OBJC_METH_VAR_NAME_", 2364 &CGM.getModule()); 2365 Entry->setSection("__TEXT,__cstring,cstring_literals"); 2366 UsedGlobals.push_back(Entry); 2367 } 2368 2369 return getConstantGEP(Entry, 0, 0); 2370} 2371 2372// FIXME: Merge into a single cstring creation function. 2373llvm::Constant *CGObjCCommonMac::GetMethodVarName(IdentifierInfo *ID) { 2374 return GetMethodVarName(CGM.getContext().Selectors.getNullarySelector(ID)); 2375} 2376 2377// FIXME: Merge into a single cstring creation function. 2378llvm::Constant *CGObjCCommonMac::GetMethodVarName(const std::string &Name) { 2379 return GetMethodVarName(&CGM.getContext().Idents.get(Name)); 2380} 2381 2382llvm::Constant *CGObjCCommonMac::GetMethodVarType(const std::string &Name) { 2383 llvm::GlobalVariable *&Entry = MethodVarTypes[Name]; 2384 2385 if (!Entry) { 2386 llvm::Constant *C = llvm::ConstantArray::get(Name); 2387 Entry = 2388 new llvm::GlobalVariable(C->getType(), false, 2389 llvm::GlobalValue::InternalLinkage, 2390 C, "\01L_OBJC_METH_VAR_TYPE_", 2391 &CGM.getModule()); 2392 Entry->setSection("__TEXT,__cstring,cstring_literals"); 2393 UsedGlobals.push_back(Entry); 2394 } 2395 2396 return getConstantGEP(Entry, 0, 0); 2397} 2398 2399// FIXME: Merge into a single cstring creation function. 2400llvm::Constant *CGObjCCommonMac::GetMethodVarType(const ObjCMethodDecl *D) { 2401 std::string TypeStr; 2402 CGM.getContext().getObjCEncodingForMethodDecl(const_cast<ObjCMethodDecl*>(D), 2403 TypeStr); 2404 return GetMethodVarType(TypeStr); 2405} 2406 2407// FIXME: Merge into a single cstring creation function. 2408llvm::Constant *CGObjCCommonMac::GetPropertyName(IdentifierInfo *Ident) { 2409 llvm::GlobalVariable *&Entry = PropertyNames[Ident]; 2410 2411 if (!Entry) { 2412 llvm::Constant *C = llvm::ConstantArray::get(Ident->getName()); 2413 Entry = 2414 new llvm::GlobalVariable(C->getType(), false, 2415 llvm::GlobalValue::InternalLinkage, 2416 C, "\01L_OBJC_PROP_NAME_ATTR_", 2417 &CGM.getModule()); 2418 Entry->setSection("__TEXT,__cstring,cstring_literals"); 2419 UsedGlobals.push_back(Entry); 2420 } 2421 2422 return getConstantGEP(Entry, 0, 0); 2423} 2424 2425// FIXME: Merge into a single cstring creation function. 2426// FIXME: This Decl should be more precise. 2427llvm::Constant *CGObjCCommonMac::GetPropertyTypeString(const ObjCPropertyDecl *PD, 2428 const Decl *Container) { 2429 std::string TypeStr; 2430 CGM.getContext().getObjCEncodingForPropertyDecl(PD, Container, TypeStr); 2431 return GetPropertyName(&CGM.getContext().Idents.get(TypeStr)); 2432} 2433 2434void CGObjCCommonMac::GetNameForMethod(const ObjCMethodDecl *D, 2435 const ObjCContainerDecl *CD, 2436 std::string &NameOut) { 2437 // FIXME: Find the mangling GCC uses. 2438 NameOut = (D->isInstanceMethod() ? "-" : "+"); 2439 NameOut += '['; 2440 assert (CD && "Missing container decl in GetNameForMethod"); 2441 NameOut += CD->getNameAsString(); 2442 // FIXME. For a method in a category, (CAT_NAME) is inserted here. 2443 // Right now! there is not enough info. to do this. 2444 NameOut += ' '; 2445 NameOut += D->getSelector().getAsString(); 2446 NameOut += ']'; 2447} 2448 2449/// GetFirstIvarInRecord - This routine returns the record for the 2450/// implementation of the fiven class OID. It also returns field 2451/// corresponding to the first ivar in the class in FIV. It also 2452/// returns the one before the first ivar. 2453/// 2454const RecordDecl *CGObjCCommonMac::GetFirstIvarInRecord( 2455 const ObjCInterfaceDecl *OID, 2456 RecordDecl::field_iterator &FIV, 2457 RecordDecl::field_iterator &PIV) { 2458 int countSuperClassIvars = countInheritedIvars(OID->getSuperClass()); 2459 const RecordDecl *RD = CGM.getContext().addRecordToClass(OID); 2460 RecordDecl::field_iterator ifield = RD->field_begin(); 2461 RecordDecl::field_iterator pfield = RD->field_end(); 2462 while (countSuperClassIvars-- > 0) { 2463 pfield = ifield; 2464 ++ifield; 2465 } 2466 FIV = ifield; 2467 PIV = pfield; 2468 return RD; 2469} 2470 2471void CGObjCMac::FinishModule() { 2472 EmitModuleInfo(); 2473 2474 // Emit the dummy bodies for any protocols which were referenced but 2475 // never defined. 2476 for (llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*>::iterator 2477 i = Protocols.begin(), e = Protocols.end(); i != e; ++i) { 2478 if (i->second->hasInitializer()) 2479 continue; 2480 2481 std::vector<llvm::Constant*> Values(5); 2482 Values[0] = llvm::Constant::getNullValue(ObjCTypes.ProtocolExtensionPtrTy); 2483 Values[1] = GetClassName(i->first); 2484 Values[2] = llvm::Constant::getNullValue(ObjCTypes.ProtocolListPtrTy); 2485 Values[3] = Values[4] = 2486 llvm::Constant::getNullValue(ObjCTypes.MethodDescriptionListPtrTy); 2487 i->second->setLinkage(llvm::GlobalValue::InternalLinkage); 2488 i->second->setInitializer(llvm::ConstantStruct::get(ObjCTypes.ProtocolTy, 2489 Values)); 2490 } 2491 2492 std::vector<llvm::Constant*> Used; 2493 for (std::vector<llvm::GlobalVariable*>::iterator i = UsedGlobals.begin(), 2494 e = UsedGlobals.end(); i != e; ++i) { 2495 Used.push_back(llvm::ConstantExpr::getBitCast(*i, ObjCTypes.Int8PtrTy)); 2496 } 2497 2498 llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.Int8PtrTy, Used.size()); 2499 llvm::GlobalValue *GV = 2500 new llvm::GlobalVariable(AT, false, 2501 llvm::GlobalValue::AppendingLinkage, 2502 llvm::ConstantArray::get(AT, Used), 2503 "llvm.used", 2504 &CGM.getModule()); 2505 2506 GV->setSection("llvm.metadata"); 2507 2508 // Add assembler directives to add lazy undefined symbol references 2509 // for classes which are referenced but not defined. This is 2510 // important for correct linker interaction. 2511 2512 // FIXME: Uh, this isn't particularly portable. 2513 std::stringstream s; 2514 2515 if (!CGM.getModule().getModuleInlineAsm().empty()) 2516 s << "\n"; 2517 2518 for (std::set<IdentifierInfo*>::iterator i = LazySymbols.begin(), 2519 e = LazySymbols.end(); i != e; ++i) { 2520 s << "\t.lazy_reference .objc_class_name_" << (*i)->getName() << "\n"; 2521 } 2522 for (std::set<IdentifierInfo*>::iterator i = DefinedSymbols.begin(), 2523 e = DefinedSymbols.end(); i != e; ++i) { 2524 s << "\t.objc_class_name_" << (*i)->getName() << "=0\n" 2525 << "\t.globl .objc_class_name_" << (*i)->getName() << "\n"; 2526 } 2527 2528 CGM.getModule().appendModuleInlineAsm(s.str()); 2529} 2530 2531CGObjCNonFragileABIMac::CGObjCNonFragileABIMac(CodeGen::CodeGenModule &cgm) 2532 : CGObjCCommonMac(cgm), 2533 ObjCTypes(cgm) 2534{ 2535 ObjCEmptyCacheVar = ObjCEmptyVtableVar = NULL; 2536 ObjCABI = 2; 2537} 2538 2539/* *** */ 2540 2541ObjCCommonTypesHelper::ObjCCommonTypesHelper(CodeGen::CodeGenModule &cgm) 2542: CGM(cgm) 2543{ 2544 CodeGen::CodeGenTypes &Types = CGM.getTypes(); 2545 ASTContext &Ctx = CGM.getContext(); 2546 2547 ShortTy = Types.ConvertType(Ctx.ShortTy); 2548 IntTy = Types.ConvertType(Ctx.IntTy); 2549 LongTy = Types.ConvertType(Ctx.LongTy); 2550 Int8PtrTy = llvm::PointerType::getUnqual(llvm::Type::Int8Ty); 2551 2552 ObjectPtrTy = Types.ConvertType(Ctx.getObjCIdType()); 2553 PtrObjectPtrTy = llvm::PointerType::getUnqual(ObjectPtrTy); 2554 SelectorPtrTy = Types.ConvertType(Ctx.getObjCSelType()); 2555 2556 // FIXME: It would be nice to unify this with the opaque type, so 2557 // that the IR comes out a bit cleaner. 2558 const llvm::Type *T = Types.ConvertType(Ctx.getObjCProtoType()); 2559 ExternalProtocolPtrTy = llvm::PointerType::getUnqual(T); 2560 2561 // I'm not sure I like this. The implicit coordination is a bit 2562 // gross. We should solve this in a reasonable fashion because this 2563 // is a pretty common task (match some runtime data structure with 2564 // an LLVM data structure). 2565 2566 // FIXME: This is leaked. 2567 // FIXME: Merge with rewriter code? 2568 2569 // struct _objc_super { 2570 // id self; 2571 // Class cls; 2572 // } 2573 RecordDecl *RD = RecordDecl::Create(Ctx, TagDecl::TK_struct, 0, 2574 SourceLocation(), 2575 &Ctx.Idents.get("_objc_super")); 2576 RD->addDecl(FieldDecl::Create(Ctx, RD, SourceLocation(), 0, 2577 Ctx.getObjCIdType(), 0, false)); 2578 RD->addDecl(FieldDecl::Create(Ctx, RD, SourceLocation(), 0, 2579 Ctx.getObjCClassType(), 0, false)); 2580 RD->completeDefinition(Ctx); 2581 2582 SuperCTy = Ctx.getTagDeclType(RD); 2583 SuperPtrCTy = Ctx.getPointerType(SuperCTy); 2584 2585 SuperTy = cast<llvm::StructType>(Types.ConvertType(SuperCTy)); 2586 SuperPtrTy = llvm::PointerType::getUnqual(SuperTy); 2587 2588 // struct _prop_t { 2589 // char *name; 2590 // char *attributes; 2591 // } 2592 PropertyTy = llvm::StructType::get(Int8PtrTy, 2593 Int8PtrTy, 2594 NULL); 2595 CGM.getModule().addTypeName("struct._prop_t", 2596 PropertyTy); 2597 2598 // struct _prop_list_t { 2599 // uint32_t entsize; // sizeof(struct _prop_t) 2600 // uint32_t count_of_properties; 2601 // struct _prop_t prop_list[count_of_properties]; 2602 // } 2603 PropertyListTy = llvm::StructType::get(IntTy, 2604 IntTy, 2605 llvm::ArrayType::get(PropertyTy, 0), 2606 NULL); 2607 CGM.getModule().addTypeName("struct._prop_list_t", 2608 PropertyListTy); 2609 // struct _prop_list_t * 2610 PropertyListPtrTy = llvm::PointerType::getUnqual(PropertyListTy); 2611 2612 // struct _objc_method { 2613 // SEL _cmd; 2614 // char *method_type; 2615 // char *_imp; 2616 // } 2617 MethodTy = llvm::StructType::get(SelectorPtrTy, 2618 Int8PtrTy, 2619 Int8PtrTy, 2620 NULL); 2621 CGM.getModule().addTypeName("struct._objc_method", MethodTy); 2622 2623 // struct _objc_cache * 2624 CacheTy = llvm::OpaqueType::get(); 2625 CGM.getModule().addTypeName("struct._objc_cache", CacheTy); 2626 CachePtrTy = llvm::PointerType::getUnqual(CacheTy); 2627 2628 // Property manipulation functions. 2629 2630 QualType IdType = Ctx.getObjCIdType(); 2631 QualType SelType = Ctx.getObjCSelType(); 2632 llvm::SmallVector<QualType,16> Params; 2633 const llvm::FunctionType *FTy; 2634 2635 // id objc_getProperty (id, SEL, ptrdiff_t, bool) 2636 Params.push_back(IdType); 2637 Params.push_back(SelType); 2638 Params.push_back(Ctx.LongTy); 2639 Params.push_back(Ctx.BoolTy); 2640 FTy = Types.GetFunctionType(Types.getFunctionInfo(IdType, Params), 2641 false); 2642 GetPropertyFn = CGM.CreateRuntimeFunction(FTy, "objc_getProperty"); 2643 2644 // void objc_setProperty (id, SEL, ptrdiff_t, id, bool, bool) 2645 Params.clear(); 2646 Params.push_back(IdType); 2647 Params.push_back(SelType); 2648 Params.push_back(Ctx.LongTy); 2649 Params.push_back(IdType); 2650 Params.push_back(Ctx.BoolTy); 2651 Params.push_back(Ctx.BoolTy); 2652 FTy = Types.GetFunctionType(Types.getFunctionInfo(Ctx.VoidTy, Params), false); 2653 SetPropertyFn = CGM.CreateRuntimeFunction(FTy, "objc_setProperty"); 2654 2655 // Enumeration mutation. 2656 2657 // void objc_enumerationMutation (id) 2658 Params.clear(); 2659 Params.push_back(IdType); 2660 FTy = Types.GetFunctionType(Types.getFunctionInfo(Ctx.VoidTy, Params), false); 2661 EnumerationMutationFn = CGM.CreateRuntimeFunction(FTy, 2662 "objc_enumerationMutation"); 2663 2664 // gc's API 2665 // id objc_read_weak (id *) 2666 Params.clear(); 2667 Params.push_back(Ctx.getPointerType(IdType)); 2668 FTy = Types.GetFunctionType(Types.getFunctionInfo(IdType, Params), false); 2669 GcReadWeakFn = CGM.CreateRuntimeFunction(FTy, "objc_read_weak"); 2670 2671 // id objc_assign_weak (id, id *) 2672 Params.clear(); 2673 Params.push_back(IdType); 2674 Params.push_back(Ctx.getPointerType(IdType)); 2675 2676 FTy = Types.GetFunctionType(Types.getFunctionInfo(IdType, Params), false); 2677 GcAssignWeakFn = CGM.CreateRuntimeFunction(FTy, "objc_assign_weak"); 2678 GcAssignGlobalFn = CGM.CreateRuntimeFunction(FTy, "objc_assign_global"); 2679 GcAssignIvarFn = CGM.CreateRuntimeFunction(FTy, "objc_assign_ivar"); 2680 GcAssignStrongCastFn = 2681 CGM.CreateRuntimeFunction(FTy, "objc_assign_strongCast"); 2682} 2683 2684ObjCTypesHelper::ObjCTypesHelper(CodeGen::CodeGenModule &cgm) 2685 : ObjCCommonTypesHelper(cgm) 2686{ 2687 // struct _objc_method_description { 2688 // SEL name; 2689 // char *types; 2690 // } 2691 MethodDescriptionTy = 2692 llvm::StructType::get(SelectorPtrTy, 2693 Int8PtrTy, 2694 NULL); 2695 CGM.getModule().addTypeName("struct._objc_method_description", 2696 MethodDescriptionTy); 2697 2698 // struct _objc_method_description_list { 2699 // int count; 2700 // struct _objc_method_description[1]; 2701 // } 2702 MethodDescriptionListTy = 2703 llvm::StructType::get(IntTy, 2704 llvm::ArrayType::get(MethodDescriptionTy, 0), 2705 NULL); 2706 CGM.getModule().addTypeName("struct._objc_method_description_list", 2707 MethodDescriptionListTy); 2708 2709 // struct _objc_method_description_list * 2710 MethodDescriptionListPtrTy = 2711 llvm::PointerType::getUnqual(MethodDescriptionListTy); 2712 2713 // Protocol description structures 2714 2715 // struct _objc_protocol_extension { 2716 // uint32_t size; // sizeof(struct _objc_protocol_extension) 2717 // struct _objc_method_description_list *optional_instance_methods; 2718 // struct _objc_method_description_list *optional_class_methods; 2719 // struct _objc_property_list *instance_properties; 2720 // } 2721 ProtocolExtensionTy = 2722 llvm::StructType::get(IntTy, 2723 MethodDescriptionListPtrTy, 2724 MethodDescriptionListPtrTy, 2725 PropertyListPtrTy, 2726 NULL); 2727 CGM.getModule().addTypeName("struct._objc_protocol_extension", 2728 ProtocolExtensionTy); 2729 2730 // struct _objc_protocol_extension * 2731 ProtocolExtensionPtrTy = llvm::PointerType::getUnqual(ProtocolExtensionTy); 2732 2733 // Handle recursive construction of Protocol and ProtocolList types 2734 2735 llvm::PATypeHolder ProtocolTyHolder = llvm::OpaqueType::get(); 2736 llvm::PATypeHolder ProtocolListTyHolder = llvm::OpaqueType::get(); 2737 2738 const llvm::Type *T = 2739 llvm::StructType::get(llvm::PointerType::getUnqual(ProtocolListTyHolder), 2740 LongTy, 2741 llvm::ArrayType::get(ProtocolTyHolder, 0), 2742 NULL); 2743 cast<llvm::OpaqueType>(ProtocolListTyHolder.get())->refineAbstractTypeTo(T); 2744 2745 // struct _objc_protocol { 2746 // struct _objc_protocol_extension *isa; 2747 // char *protocol_name; 2748 // struct _objc_protocol **_objc_protocol_list; 2749 // struct _objc_method_description_list *instance_methods; 2750 // struct _objc_method_description_list *class_methods; 2751 // } 2752 T = llvm::StructType::get(ProtocolExtensionPtrTy, 2753 Int8PtrTy, 2754 llvm::PointerType::getUnqual(ProtocolListTyHolder), 2755 MethodDescriptionListPtrTy, 2756 MethodDescriptionListPtrTy, 2757 NULL); 2758 cast<llvm::OpaqueType>(ProtocolTyHolder.get())->refineAbstractTypeTo(T); 2759 2760 ProtocolListTy = cast<llvm::StructType>(ProtocolListTyHolder.get()); 2761 CGM.getModule().addTypeName("struct._objc_protocol_list", 2762 ProtocolListTy); 2763 // struct _objc_protocol_list * 2764 ProtocolListPtrTy = llvm::PointerType::getUnqual(ProtocolListTy); 2765 2766 ProtocolTy = cast<llvm::StructType>(ProtocolTyHolder.get()); 2767 CGM.getModule().addTypeName("struct._objc_protocol", ProtocolTy); 2768 ProtocolPtrTy = llvm::PointerType::getUnqual(ProtocolTy); 2769 2770 // Class description structures 2771 2772 // struct _objc_ivar { 2773 // char *ivar_name; 2774 // char *ivar_type; 2775 // int ivar_offset; 2776 // } 2777 IvarTy = llvm::StructType::get(Int8PtrTy, 2778 Int8PtrTy, 2779 IntTy, 2780 NULL); 2781 CGM.getModule().addTypeName("struct._objc_ivar", IvarTy); 2782 2783 // struct _objc_ivar_list * 2784 IvarListTy = llvm::OpaqueType::get(); 2785 CGM.getModule().addTypeName("struct._objc_ivar_list", IvarListTy); 2786 IvarListPtrTy = llvm::PointerType::getUnqual(IvarListTy); 2787 2788 // struct _objc_method_list * 2789 MethodListTy = llvm::OpaqueType::get(); 2790 CGM.getModule().addTypeName("struct._objc_method_list", MethodListTy); 2791 MethodListPtrTy = llvm::PointerType::getUnqual(MethodListTy); 2792 2793 // struct _objc_class_extension * 2794 ClassExtensionTy = 2795 llvm::StructType::get(IntTy, 2796 Int8PtrTy, 2797 PropertyListPtrTy, 2798 NULL); 2799 CGM.getModule().addTypeName("struct._objc_class_extension", ClassExtensionTy); 2800 ClassExtensionPtrTy = llvm::PointerType::getUnqual(ClassExtensionTy); 2801 2802 llvm::PATypeHolder ClassTyHolder = llvm::OpaqueType::get(); 2803 2804 // struct _objc_class { 2805 // Class isa; 2806 // Class super_class; 2807 // char *name; 2808 // long version; 2809 // long info; 2810 // long instance_size; 2811 // struct _objc_ivar_list *ivars; 2812 // struct _objc_method_list *methods; 2813 // struct _objc_cache *cache; 2814 // struct _objc_protocol_list *protocols; 2815 // char *ivar_layout; 2816 // struct _objc_class_ext *ext; 2817 // }; 2818 T = llvm::StructType::get(llvm::PointerType::getUnqual(ClassTyHolder), 2819 llvm::PointerType::getUnqual(ClassTyHolder), 2820 Int8PtrTy, 2821 LongTy, 2822 LongTy, 2823 LongTy, 2824 IvarListPtrTy, 2825 MethodListPtrTy, 2826 CachePtrTy, 2827 ProtocolListPtrTy, 2828 Int8PtrTy, 2829 ClassExtensionPtrTy, 2830 NULL); 2831 cast<llvm::OpaqueType>(ClassTyHolder.get())->refineAbstractTypeTo(T); 2832 2833 ClassTy = cast<llvm::StructType>(ClassTyHolder.get()); 2834 CGM.getModule().addTypeName("struct._objc_class", ClassTy); 2835 ClassPtrTy = llvm::PointerType::getUnqual(ClassTy); 2836 2837 // struct _objc_category { 2838 // char *category_name; 2839 // char *class_name; 2840 // struct _objc_method_list *instance_method; 2841 // struct _objc_method_list *class_method; 2842 // uint32_t size; // sizeof(struct _objc_category) 2843 // struct _objc_property_list *instance_properties;// category's @property 2844 // } 2845 CategoryTy = llvm::StructType::get(Int8PtrTy, 2846 Int8PtrTy, 2847 MethodListPtrTy, 2848 MethodListPtrTy, 2849 ProtocolListPtrTy, 2850 IntTy, 2851 PropertyListPtrTy, 2852 NULL); 2853 CGM.getModule().addTypeName("struct._objc_category", CategoryTy); 2854 2855 // Global metadata structures 2856 2857 // struct _objc_symtab { 2858 // long sel_ref_cnt; 2859 // SEL *refs; 2860 // short cls_def_cnt; 2861 // short cat_def_cnt; 2862 // char *defs[cls_def_cnt + cat_def_cnt]; 2863 // } 2864 SymtabTy = llvm::StructType::get(LongTy, 2865 SelectorPtrTy, 2866 ShortTy, 2867 ShortTy, 2868 llvm::ArrayType::get(Int8PtrTy, 0), 2869 NULL); 2870 CGM.getModule().addTypeName("struct._objc_symtab", SymtabTy); 2871 SymtabPtrTy = llvm::PointerType::getUnqual(SymtabTy); 2872 2873 // struct _objc_module { 2874 // long version; 2875 // long size; // sizeof(struct _objc_module) 2876 // char *name; 2877 // struct _objc_symtab* symtab; 2878 // } 2879 ModuleTy = 2880 llvm::StructType::get(LongTy, 2881 LongTy, 2882 Int8PtrTy, 2883 SymtabPtrTy, 2884 NULL); 2885 CGM.getModule().addTypeName("struct._objc_module", ModuleTy); 2886 2887 // Message send functions. 2888 2889 // id objc_msgSend (id, SEL, ...) 2890 std::vector<const llvm::Type*> Params; 2891 Params.push_back(ObjectPtrTy); 2892 Params.push_back(SelectorPtrTy); 2893 MessageSendFn = 2894 CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 2895 Params, 2896 true), 2897 "objc_msgSend"); 2898 2899 // id objc_msgSend_stret (id, SEL, ...) 2900 Params.clear(); 2901 Params.push_back(ObjectPtrTy); 2902 Params.push_back(SelectorPtrTy); 2903 MessageSendStretFn = 2904 CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::VoidTy, 2905 Params, 2906 true), 2907 "objc_msgSend_stret"); 2908 2909 // 2910 Params.clear(); 2911 Params.push_back(ObjectPtrTy); 2912 Params.push_back(SelectorPtrTy); 2913 // FIXME: This should be long double on x86_64? 2914 // [double | long double] objc_msgSend_fpret(id self, SEL op, ...) 2915 MessageSendFpretFn = 2916 CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::DoubleTy, 2917 Params, 2918 true), 2919 "objc_msgSend_fpret"); 2920 2921 // id objc_msgSendSuper(struct objc_super *super, SEL op, ...) 2922 Params.clear(); 2923 Params.push_back(SuperPtrTy); 2924 Params.push_back(SelectorPtrTy); 2925 MessageSendSuperFn = 2926 CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 2927 Params, 2928 true), 2929 "objc_msgSendSuper"); 2930 2931 // void objc_msgSendSuper_stret(void * stretAddr, struct objc_super *super, 2932 // SEL op, ...) 2933 Params.clear(); 2934 Params.push_back(Int8PtrTy); 2935 Params.push_back(SuperPtrTy); 2936 Params.push_back(SelectorPtrTy); 2937 MessageSendSuperStretFn = 2938 CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::VoidTy, 2939 Params, 2940 true), 2941 "objc_msgSendSuper_stret"); 2942 2943 // There is no objc_msgSendSuper_fpret? How can that work? 2944 MessageSendSuperFpretFn = MessageSendSuperFn; 2945 2946 // FIXME: This is the size of the setjmp buffer and should be 2947 // target specific. 18 is what's used on 32-bit X86. 2948 uint64_t SetJmpBufferSize = 18; 2949 2950 // Exceptions 2951 const llvm::Type *StackPtrTy = 2952 llvm::ArrayType::get(llvm::PointerType::getUnqual(llvm::Type::Int8Ty), 4); 2953 2954 ExceptionDataTy = 2955 llvm::StructType::get(llvm::ArrayType::get(llvm::Type::Int32Ty, 2956 SetJmpBufferSize), 2957 StackPtrTy, NULL); 2958 CGM.getModule().addTypeName("struct._objc_exception_data", 2959 ExceptionDataTy); 2960 2961 Params.clear(); 2962 Params.push_back(ObjectPtrTy); 2963 ExceptionThrowFn = 2964 CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::VoidTy, 2965 Params, 2966 false), 2967 "objc_exception_throw"); 2968 2969 Params.clear(); 2970 Params.push_back(llvm::PointerType::getUnqual(ExceptionDataTy)); 2971 ExceptionTryEnterFn = 2972 CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::VoidTy, 2973 Params, 2974 false), 2975 "objc_exception_try_enter"); 2976 ExceptionTryExitFn = 2977 CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::VoidTy, 2978 Params, 2979 false), 2980 "objc_exception_try_exit"); 2981 ExceptionExtractFn = 2982 CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 2983 Params, 2984 false), 2985 "objc_exception_extract"); 2986 2987 Params.clear(); 2988 Params.push_back(ClassPtrTy); 2989 Params.push_back(ObjectPtrTy); 2990 ExceptionMatchFn = 2991 CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::Int32Ty, 2992 Params, 2993 false), 2994 "objc_exception_match"); 2995 2996 // synchronized APIs 2997 // void objc_sync_enter (id) 2998 Params.clear(); 2999 Params.push_back(ObjectPtrTy); 3000 SyncEnterFn = 3001 CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::VoidTy, 3002 Params, 3003 false), 3004 "objc_sync_enter"); 3005 // void objc_sync_exit (id) 3006 SyncExitFn = 3007 CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::VoidTy, 3008 Params, 3009 false), 3010 "objc_sync_exit"); 3011 3012 3013 Params.clear(); 3014 Params.push_back(llvm::PointerType::getUnqual(llvm::Type::Int32Ty)); 3015 SetJmpFn = 3016 CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::Int32Ty, 3017 Params, 3018 false), 3019 "_setjmp"); 3020 3021} 3022 3023ObjCNonFragileABITypesHelper::ObjCNonFragileABITypesHelper(CodeGen::CodeGenModule &cgm) 3024: ObjCCommonTypesHelper(cgm) 3025{ 3026 // struct _method_list_t { 3027 // uint32_t entsize; // sizeof(struct _objc_method) 3028 // uint32_t method_count; 3029 // struct _objc_method method_list[method_count]; 3030 // } 3031 MethodListnfABITy = llvm::StructType::get(IntTy, 3032 IntTy, 3033 llvm::ArrayType::get(MethodTy, 0), 3034 NULL); 3035 CGM.getModule().addTypeName("struct.__method_list_t", 3036 MethodListnfABITy); 3037 // struct method_list_t * 3038 MethodListnfABIPtrTy = llvm::PointerType::getUnqual(MethodListnfABITy); 3039 3040 // struct _protocol_t { 3041 // id isa; // NULL 3042 // const char * const protocol_name; 3043 // const struct _protocol_list_t * protocol_list; // super protocols 3044 // const struct method_list_t * const instance_methods; 3045 // const struct method_list_t * const class_methods; 3046 // const struct method_list_t *optionalInstanceMethods; 3047 // const struct method_list_t *optionalClassMethods; 3048 // const struct _prop_list_t * properties; 3049 // const uint32_t size; // sizeof(struct _protocol_t) 3050 // const uint32_t flags; // = 0 3051 // } 3052 3053 // Holder for struct _protocol_list_t * 3054 llvm::PATypeHolder ProtocolListTyHolder = llvm::OpaqueType::get(); 3055 3056 ProtocolnfABITy = llvm::StructType::get(ObjectPtrTy, 3057 Int8PtrTy, 3058 llvm::PointerType::getUnqual( 3059 ProtocolListTyHolder), 3060 MethodListnfABIPtrTy, 3061 MethodListnfABIPtrTy, 3062 MethodListnfABIPtrTy, 3063 MethodListnfABIPtrTy, 3064 PropertyListPtrTy, 3065 IntTy, 3066 IntTy, 3067 NULL); 3068 CGM.getModule().addTypeName("struct._protocol_t", 3069 ProtocolnfABITy); 3070 3071 // struct _protocol_list_t { 3072 // long protocol_count; // Note, this is 32/64 bit 3073 // struct _protocol_t[protocol_count]; 3074 // } 3075 ProtocolListnfABITy = llvm::StructType::get(LongTy, 3076 llvm::ArrayType::get( 3077 ProtocolnfABITy, 0), 3078 NULL); 3079 CGM.getModule().addTypeName("struct._objc_protocol_list", 3080 ProtocolListnfABITy); 3081 3082 // struct _objc_protocol_list* 3083 ProtocolListnfABIPtrTy = llvm::PointerType::getUnqual(ProtocolListnfABITy); 3084 3085 // FIXME! Is this doing the right thing? 3086 cast<llvm::OpaqueType>(ProtocolListTyHolder.get())->refineAbstractTypeTo( 3087 ProtocolListnfABIPtrTy); 3088 3089 // struct _ivar_t { 3090 // unsigned long int *offset; // pointer to ivar offset location 3091 // char *name; 3092 // char *type; 3093 // uint32_t alignment; 3094 // uint32_t size; 3095 // } 3096 IvarnfABITy = llvm::StructType::get(llvm::PointerType::getUnqual(LongTy), 3097 Int8PtrTy, 3098 Int8PtrTy, 3099 IntTy, 3100 IntTy, 3101 NULL); 3102 CGM.getModule().addTypeName("struct._ivar_t", IvarnfABITy); 3103 3104 // struct _ivar_list_t { 3105 // uint32 entsize; // sizeof(struct _ivar_t) 3106 // uint32 count; 3107 // struct _iver_t list[count]; 3108 // } 3109 IvarListnfABITy = llvm::StructType::get(IntTy, 3110 IntTy, 3111 llvm::ArrayType::get( 3112 IvarnfABITy, 0), 3113 NULL); 3114 CGM.getModule().addTypeName("struct._ivar_list_t", IvarListnfABITy); 3115 3116 IvarListnfABIPtrTy = llvm::PointerType::getUnqual(IvarListnfABITy); 3117 3118 // struct _class_ro_t { 3119 // uint32_t const flags; 3120 // uint32_t const instanceStart; 3121 // uint32_t const instanceSize; 3122 // uint32_t const reserved; // only when building for 64bit targets 3123 // const uint8_t * const ivarLayout; 3124 // const char *const name; 3125 // const struct _method_list_t * const baseMethods; 3126 // const struct _objc_protocol_list *const baseProtocols; 3127 // const struct _ivar_list_t *const ivars; 3128 // const uint8_t * const weakIvarLayout; 3129 // const struct _prop_list_t * const properties; 3130 // } 3131 3132 // FIXME. Add 'reserved' field in 64bit abi mode! 3133 ClassRonfABITy = llvm::StructType::get(IntTy, 3134 IntTy, 3135 IntTy, 3136 Int8PtrTy, 3137 Int8PtrTy, 3138 MethodListnfABIPtrTy, 3139 ProtocolListnfABIPtrTy, 3140 IvarListnfABIPtrTy, 3141 Int8PtrTy, 3142 PropertyListPtrTy, 3143 NULL); 3144 CGM.getModule().addTypeName("struct._class_ro_t", 3145 ClassRonfABITy); 3146 3147 // ImpnfABITy - LLVM for id (*)(id, SEL, ...) 3148 std::vector<const llvm::Type*> Params; 3149 Params.push_back(ObjectPtrTy); 3150 Params.push_back(SelectorPtrTy); 3151 ImpnfABITy = llvm::PointerType::getUnqual( 3152 llvm::FunctionType::get(ObjectPtrTy, Params, false)); 3153 3154 // struct _class_t { 3155 // struct _class_t *isa; 3156 // struct _class_t * const superclass; 3157 // void *cache; 3158 // IMP *vtable; 3159 // struct class_ro_t *ro; 3160 // } 3161 3162 llvm::PATypeHolder ClassTyHolder = llvm::OpaqueType::get(); 3163 ClassnfABITy = llvm::StructType::get(llvm::PointerType::getUnqual(ClassTyHolder), 3164 llvm::PointerType::getUnqual(ClassTyHolder), 3165 CachePtrTy, 3166 llvm::PointerType::getUnqual(ImpnfABITy), 3167 llvm::PointerType::getUnqual( 3168 ClassRonfABITy), 3169 NULL); 3170 CGM.getModule().addTypeName("struct._class_t", ClassnfABITy); 3171 3172 cast<llvm::OpaqueType>(ClassTyHolder.get())->refineAbstractTypeTo( 3173 ClassnfABITy); 3174 3175 // LLVM for struct _class_t * 3176 ClassnfABIPtrTy = llvm::PointerType::getUnqual(ClassnfABITy); 3177 3178 // struct _category_t { 3179 // const char * const name; 3180 // struct _class_t *const cls; 3181 // const struct _method_list_t * const instance_methods; 3182 // const struct _method_list_t * const class_methods; 3183 // const struct _protocol_list_t * const protocols; 3184 // const struct _prop_list_t * const properties; 3185 // } 3186 CategorynfABITy = llvm::StructType::get(Int8PtrTy, 3187 ClassnfABIPtrTy, 3188 MethodListnfABIPtrTy, 3189 MethodListnfABIPtrTy, 3190 ProtocolListnfABIPtrTy, 3191 PropertyListPtrTy, 3192 NULL); 3193 CGM.getModule().addTypeName("struct._category_t", CategorynfABITy); 3194 3195 // New types for nonfragile abi messaging. 3196 CodeGen::CodeGenTypes &Types = CGM.getTypes(); 3197 ASTContext &Ctx = CGM.getContext(); 3198 3199 // MessageRefTy - LLVM for: 3200 // struct _message_ref_t { 3201 // IMP messenger; 3202 // SEL name; 3203 // }; 3204 3205 // First the clang type for struct _message_ref_t 3206 RecordDecl *RD = RecordDecl::Create(Ctx, TagDecl::TK_struct, 0, 3207 SourceLocation(), 3208 &Ctx.Idents.get("_message_ref_t")); 3209 RD->addDecl(FieldDecl::Create(Ctx, RD, SourceLocation(), 0, 3210 Ctx.VoidPtrTy, 0, false)); 3211 RD->addDecl(FieldDecl::Create(Ctx, RD, SourceLocation(), 0, 3212 Ctx.getObjCSelType(), 0, false)); 3213 RD->completeDefinition(Ctx); 3214 3215 MessageRefCTy = Ctx.getTagDeclType(RD); 3216 MessageRefCPtrTy = Ctx.getPointerType(MessageRefCTy); 3217 MessageRefTy = cast<llvm::StructType>(Types.ConvertType(MessageRefCTy)); 3218 3219 // MessageRefPtrTy - LLVM for struct _message_ref_t* 3220 MessageRefPtrTy = llvm::PointerType::getUnqual(MessageRefTy); 3221 3222 // SuperMessageRefTy - LLVM for: 3223 // struct _super_message_ref_t { 3224 // SUPER_IMP messenger; 3225 // SEL name; 3226 // }; 3227 SuperMessageRefTy = llvm::StructType::get(ImpnfABITy, 3228 SelectorPtrTy, 3229 NULL); 3230 CGM.getModule().addTypeName("struct._super_message_ref_t", SuperMessageRefTy); 3231 3232 // SuperMessageRefPtrTy - LLVM for struct _super_message_ref_t* 3233 SuperMessageRefPtrTy = llvm::PointerType::getUnqual(SuperMessageRefTy); 3234 3235 // id objc_msgSend_fixup (id, struct message_ref_t*, ...) 3236 Params.clear(); 3237 Params.push_back(ObjectPtrTy); 3238 Params.push_back(MessageRefPtrTy); 3239 MessengerTy = llvm::FunctionType::get(ObjectPtrTy, 3240 Params, 3241 true); 3242 MessageSendFixupFn = 3243 CGM.CreateRuntimeFunction(MessengerTy, 3244 "objc_msgSend_fixup"); 3245 3246 // id objc_msgSend_fpret_fixup (id, struct message_ref_t*, ...) 3247 MessageSendFpretFixupFn = 3248 CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 3249 Params, 3250 true), 3251 "objc_msgSend_fpret_fixup"); 3252 3253 // id objc_msgSend_stret_fixup (id, struct message_ref_t*, ...) 3254 MessageSendStretFixupFn = 3255 CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 3256 Params, 3257 true), 3258 "objc_msgSend_stret_fixup"); 3259 3260 // id objc_msgSendId_fixup (id, struct message_ref_t*, ...) 3261 MessageSendIdFixupFn = 3262 CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 3263 Params, 3264 true), 3265 "objc_msgSendId_fixup"); 3266 3267 3268 // id objc_msgSendId_stret_fixup (id, struct message_ref_t*, ...) 3269 MessageSendIdStretFixupFn = 3270 CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 3271 Params, 3272 true), 3273 "objc_msgSendId_stret_fixup"); 3274 3275 // id objc_msgSendSuper2_fixup (struct objc_super *, 3276 // struct _super_message_ref_t*, ...) 3277 Params.clear(); 3278 Params.push_back(SuperPtrTy); 3279 Params.push_back(SuperMessageRefPtrTy); 3280 MessageSendSuper2FixupFn = 3281 CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 3282 Params, 3283 true), 3284 "objc_msgSendSuper2_fixup"); 3285 3286 3287 // id objc_msgSendSuper2_stret_fixup (struct objc_super *, 3288 // struct _super_message_ref_t*, ...) 3289 MessageSendSuper2StretFixupFn = 3290 CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 3291 Params, 3292 true), 3293 "objc_msgSendSuper2_stret_fixup"); 3294 3295} 3296 3297llvm::Function *CGObjCNonFragileABIMac::ModuleInitFunction() { 3298 FinishNonFragileABIModule(); 3299 3300 return NULL; 3301} 3302 3303void CGObjCNonFragileABIMac::FinishNonFragileABIModule() { 3304 // nonfragile abi has no module definition. 3305 3306 // Build list of all implemented classe addresses in array 3307 // L_OBJC_LABEL_CLASS_$. 3308 // FIXME. Also generate in L_OBJC_LABEL_NONLAZY_CLASS_$ 3309 // list of 'nonlazy' implementations (defined as those with a +load{} 3310 // method!!). 3311 unsigned NumClasses = DefinedClasses.size(); 3312 if (NumClasses) { 3313 std::vector<llvm::Constant*> Symbols(NumClasses); 3314 for (unsigned i=0; i<NumClasses; i++) 3315 Symbols[i] = llvm::ConstantExpr::getBitCast(DefinedClasses[i], 3316 ObjCTypes.Int8PtrTy); 3317 llvm::Constant* Init = 3318 llvm::ConstantArray::get(llvm::ArrayType::get(ObjCTypes.Int8PtrTy, 3319 NumClasses), 3320 Symbols); 3321 3322 llvm::GlobalVariable *GV = 3323 new llvm::GlobalVariable(Init->getType(), false, 3324 llvm::GlobalValue::InternalLinkage, 3325 Init, 3326 "\01L_OBJC_LABEL_CLASS_$", 3327 &CGM.getModule()); 3328 GV->setSection("__DATA, __objc_classlist, regular, no_dead_strip"); 3329 UsedGlobals.push_back(GV); 3330 } 3331 3332 // Build list of all implemented category addresses in array 3333 // L_OBJC_LABEL_CATEGORY_$. 3334 // FIXME. Also generate in L_OBJC_LABEL_NONLAZY_CATEGORY_$ 3335 // list of 'nonlazy' category implementations (defined as those with a +load{} 3336 // method!!). 3337 unsigned NumCategory = DefinedCategories.size(); 3338 if (NumCategory) { 3339 std::vector<llvm::Constant*> Symbols(NumCategory); 3340 for (unsigned i=0; i<NumCategory; i++) 3341 Symbols[i] = llvm::ConstantExpr::getBitCast(DefinedCategories[i], 3342 ObjCTypes.Int8PtrTy); 3343 llvm::Constant* Init = 3344 llvm::ConstantArray::get(llvm::ArrayType::get(ObjCTypes.Int8PtrTy, 3345 NumCategory), 3346 Symbols); 3347 3348 llvm::GlobalVariable *GV = 3349 new llvm::GlobalVariable(Init->getType(), false, 3350 llvm::GlobalValue::InternalLinkage, 3351 Init, 3352 "\01L_OBJC_LABEL_CATEGORY_$", 3353 &CGM.getModule()); 3354 GV->setSection("__DATA, __objc_catlist, regular, no_dead_strip"); 3355 UsedGlobals.push_back(GV); 3356 } 3357 3358 // static int L_OBJC_IMAGE_INFO[2] = { 0, flags }; 3359 // FIXME. flags can be 0 | 1 | 2 | 6. For now just use 0 3360 std::vector<llvm::Constant*> Values(2); 3361 Values[0] = llvm::ConstantInt::get(ObjCTypes.IntTy, 0); 3362 Values[1] = llvm::ConstantInt::get(ObjCTypes.IntTy, 0); 3363 llvm::Constant* Init = llvm::ConstantArray::get( 3364 llvm::ArrayType::get(ObjCTypes.IntTy, 2), 3365 Values); 3366 llvm::GlobalVariable *IMGV = 3367 new llvm::GlobalVariable(Init->getType(), false, 3368 llvm::GlobalValue::InternalLinkage, 3369 Init, 3370 "\01L_OBJC_IMAGE_INFO", 3371 &CGM.getModule()); 3372 IMGV->setSection("__DATA, __objc_imageinfo, regular, no_dead_strip"); 3373 UsedGlobals.push_back(IMGV); 3374 3375 std::vector<llvm::Constant*> Used; 3376 for (std::vector<llvm::GlobalVariable*>::iterator i = UsedGlobals.begin(), 3377 e = UsedGlobals.end(); i != e; ++i) { 3378 Used.push_back(llvm::ConstantExpr::getBitCast(*i, ObjCTypes.Int8PtrTy)); 3379 } 3380 3381 llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.Int8PtrTy, Used.size()); 3382 llvm::GlobalValue *GV = 3383 new llvm::GlobalVariable(AT, false, 3384 llvm::GlobalValue::AppendingLinkage, 3385 llvm::ConstantArray::get(AT, Used), 3386 "llvm.used", 3387 &CGM.getModule()); 3388 3389 GV->setSection("llvm.metadata"); 3390 3391} 3392 3393// Metadata flags 3394enum MetaDataDlags { 3395 CLS = 0x0, 3396 CLS_META = 0x1, 3397 CLS_ROOT = 0x2, 3398 OBJC2_CLS_HIDDEN = 0x10, 3399 CLS_EXCEPTION = 0x20 3400}; 3401/// BuildClassRoTInitializer - generate meta-data for: 3402/// struct _class_ro_t { 3403/// uint32_t const flags; 3404/// uint32_t const instanceStart; 3405/// uint32_t const instanceSize; 3406/// uint32_t const reserved; // only when building for 64bit targets 3407/// const uint8_t * const ivarLayout; 3408/// const char *const name; 3409/// const struct _method_list_t * const baseMethods; 3410/// const struct _protocol_list_t *const baseProtocols; 3411/// const struct _ivar_list_t *const ivars; 3412/// const uint8_t * const weakIvarLayout; 3413/// const struct _prop_list_t * const properties; 3414/// } 3415/// 3416llvm::GlobalVariable * CGObjCNonFragileABIMac::BuildClassRoTInitializer( 3417 unsigned flags, 3418 unsigned InstanceStart, 3419 unsigned InstanceSize, 3420 const ObjCImplementationDecl *ID) { 3421 std::string ClassName = ID->getNameAsString(); 3422 std::vector<llvm::Constant*> Values(10); // 11 for 64bit targets! 3423 Values[ 0] = llvm::ConstantInt::get(ObjCTypes.IntTy, flags); 3424 Values[ 1] = llvm::ConstantInt::get(ObjCTypes.IntTy, InstanceStart); 3425 Values[ 2] = llvm::ConstantInt::get(ObjCTypes.IntTy, InstanceSize); 3426 // FIXME. For 64bit targets add 0 here. 3427 // FIXME. ivarLayout is currently null! 3428 Values[ 3] = llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy); 3429 Values[ 4] = GetClassName(ID->getIdentifier()); 3430 // const struct _method_list_t * const baseMethods; 3431 std::vector<llvm::Constant*> Methods; 3432 std::string MethodListName("\01l_OBJC_$_"); 3433 if (flags & CLS_META) { 3434 MethodListName += "CLASS_METHODS_" + ID->getNameAsString(); 3435 for (ObjCImplementationDecl::classmeth_iterator i = ID->classmeth_begin(), 3436 e = ID->classmeth_end(); i != e; ++i) { 3437 // Class methods should always be defined. 3438 Methods.push_back(GetMethodConstant(*i)); 3439 } 3440 } else { 3441 MethodListName += "INSTANCE_METHODS_" + ID->getNameAsString(); 3442 for (ObjCImplementationDecl::instmeth_iterator i = ID->instmeth_begin(), 3443 e = ID->instmeth_end(); i != e; ++i) { 3444 // Instance methods should always be defined. 3445 Methods.push_back(GetMethodConstant(*i)); 3446 } 3447 for (ObjCImplementationDecl::propimpl_iterator i = ID->propimpl_begin(), 3448 e = ID->propimpl_end(); i != e; ++i) { 3449 ObjCPropertyImplDecl *PID = *i; 3450 3451 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize){ 3452 ObjCPropertyDecl *PD = PID->getPropertyDecl(); 3453 3454 if (ObjCMethodDecl *MD = PD->getGetterMethodDecl()) 3455 if (llvm::Constant *C = GetMethodConstant(MD)) 3456 Methods.push_back(C); 3457 if (ObjCMethodDecl *MD = PD->getSetterMethodDecl()) 3458 if (llvm::Constant *C = GetMethodConstant(MD)) 3459 Methods.push_back(C); 3460 } 3461 } 3462 } 3463 Values[ 5] = EmitMethodList(MethodListName, 3464 "__DATA, __objc_const", Methods); 3465 3466 const ObjCInterfaceDecl *OID = ID->getClassInterface(); 3467 assert(OID && "CGObjCNonFragileABIMac::BuildClassRoTInitializer"); 3468 Values[ 6] = EmitProtocolList("\01l_OBJC_CLASS_PROTOCOLS_$_" 3469 + OID->getNameAsString(), 3470 OID->protocol_begin(), 3471 OID->protocol_end()); 3472 3473 if (flags & CLS_META) 3474 Values[ 7] = llvm::Constant::getNullValue(ObjCTypes.IvarListnfABIPtrTy); 3475 else 3476 Values[ 7] = EmitIvarList(ID); 3477 // FIXME. weakIvarLayout is currently null. 3478 Values[ 8] = llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy); 3479 if (flags & CLS_META) 3480 Values[ 9] = llvm::Constant::getNullValue(ObjCTypes.PropertyListPtrTy); 3481 else 3482 Values[ 9] = 3483 EmitPropertyList( 3484 "\01l_OBJC_$_PROP_LIST_" + ID->getNameAsString(), 3485 ID, ID->getClassInterface(), ObjCTypes); 3486 llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.ClassRonfABITy, 3487 Values); 3488 llvm::GlobalVariable *CLASS_RO_GV = 3489 new llvm::GlobalVariable(ObjCTypes.ClassRonfABITy, false, 3490 llvm::GlobalValue::InternalLinkage, 3491 Init, 3492 (flags & CLS_META) ? 3493 std::string("\01l_OBJC_METACLASS_RO_$_")+ClassName : 3494 std::string("\01l_OBJC_CLASS_RO_$_")+ClassName, 3495 &CGM.getModule()); 3496 CLASS_RO_GV->setAlignment( 3497 CGM.getTargetData().getPrefTypeAlignment(ObjCTypes.ClassRonfABITy)); 3498 CLASS_RO_GV->setSection("__DATA, __objc_const"); 3499 UsedGlobals.push_back(CLASS_RO_GV); 3500 return CLASS_RO_GV; 3501 3502} 3503 3504/// BuildClassMetaData - This routine defines that to-level meta-data 3505/// for the given ClassName for: 3506/// struct _class_t { 3507/// struct _class_t *isa; 3508/// struct _class_t * const superclass; 3509/// void *cache; 3510/// IMP *vtable; 3511/// struct class_ro_t *ro; 3512/// } 3513/// 3514llvm::GlobalVariable * CGObjCNonFragileABIMac::BuildClassMetaData( 3515 std::string &ClassName, 3516 llvm::Constant *IsAGV, 3517 llvm::Constant *SuperClassGV, 3518 llvm::Constant *ClassRoGV, 3519 bool HiddenVisibility) { 3520 std::vector<llvm::Constant*> Values(5); 3521 Values[0] = IsAGV; 3522 Values[1] = SuperClassGV 3523 ? SuperClassGV 3524 : llvm::Constant::getNullValue(ObjCTypes.ClassnfABIPtrTy); 3525 Values[2] = ObjCEmptyCacheVar; // &ObjCEmptyCacheVar 3526 Values[3] = ObjCEmptyVtableVar; // &ObjCEmptyVtableVar 3527 Values[4] = ClassRoGV; // &CLASS_RO_GV 3528 llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.ClassnfABITy, 3529 Values); 3530 llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(ClassName); 3531 if (GV) 3532 GV->setInitializer(Init); 3533 else 3534 GV = 3535 new llvm::GlobalVariable(ObjCTypes.ClassnfABITy, false, 3536 llvm::GlobalValue::ExternalLinkage, 3537 Init, 3538 ClassName, 3539 &CGM.getModule()); 3540 GV->setSection("__DATA, __objc_data"); 3541 GV->setAlignment( 3542 CGM.getTargetData().getPrefTypeAlignment(ObjCTypes.ClassnfABITy)); 3543 if (HiddenVisibility) 3544 GV->setVisibility(llvm::GlobalValue::HiddenVisibility); 3545 UsedGlobals.push_back(GV); 3546 return GV; 3547} 3548 3549void CGObjCNonFragileABIMac::GenerateClass(const ObjCImplementationDecl *ID) { 3550 std::string ClassName = ID->getNameAsString(); 3551 if (!ObjCEmptyCacheVar) { 3552 ObjCEmptyCacheVar = new llvm::GlobalVariable( 3553 ObjCTypes.CachePtrTy, 3554 false, 3555 llvm::GlobalValue::ExternalLinkage, 3556 0, 3557 "\01__objc_empty_cache", 3558 &CGM.getModule()); 3559 UsedGlobals.push_back(ObjCEmptyCacheVar); 3560 3561 ObjCEmptyVtableVar = new llvm::GlobalVariable( 3562 llvm::PointerType::getUnqual( 3563 ObjCTypes.ImpnfABITy), 3564 false, 3565 llvm::GlobalValue::ExternalLinkage, 3566 0, 3567 "\01__objc_empty_vtable", 3568 &CGM.getModule()); 3569 UsedGlobals.push_back(ObjCEmptyVtableVar); 3570 } 3571 assert(ID->getClassInterface() && 3572 "CGObjCNonFragileABIMac::GenerateClass - class is 0"); 3573 uint32_t InstanceStart = 3574 CGM.getTargetData().getTypePaddedSize(ObjCTypes.ClassnfABITy); 3575 uint32_t InstanceSize = InstanceStart; 3576 uint32_t flags = CLS_META; 3577 std::string ObjCMetaClassName("\01_OBJC_METACLASS_$_"); 3578 std::string ObjCClassName("\01_OBJC_CLASS_$_"); 3579 3580 llvm::GlobalVariable *SuperClassGV, *IsAGV; 3581 3582 bool classIsHidden = IsClassHidden(ID->getClassInterface()); 3583 if (classIsHidden) 3584 flags |= OBJC2_CLS_HIDDEN; 3585 if (!ID->getClassInterface()->getSuperClass()) { 3586 // class is root 3587 flags |= CLS_ROOT; 3588 std::string SuperClassName = ObjCClassName + ClassName; 3589 SuperClassGV = CGM.getModule().getGlobalVariable(SuperClassName); 3590 if (!SuperClassGV) { 3591 SuperClassGV = 3592 new llvm::GlobalVariable(ObjCTypes.ClassnfABITy, false, 3593 llvm::GlobalValue::ExternalLinkage, 3594 0, 3595 SuperClassName, 3596 &CGM.getModule()); 3597 UsedGlobals.push_back(SuperClassGV); 3598 } 3599 std::string IsAClassName = ObjCMetaClassName + ClassName; 3600 IsAGV = CGM.getModule().getGlobalVariable(IsAClassName); 3601 if (!IsAGV) { 3602 IsAGV = 3603 new llvm::GlobalVariable(ObjCTypes.ClassnfABITy, false, 3604 llvm::GlobalValue::ExternalLinkage, 3605 0, 3606 IsAClassName, 3607 &CGM.getModule()); 3608 UsedGlobals.push_back(IsAGV); 3609 } 3610 } else { 3611 // Has a root. Current class is not a root. 3612 std::string RootClassName = 3613 ID->getClassInterface()->getSuperClass()->getNameAsString(); 3614 std::string SuperClassName = ObjCMetaClassName + RootClassName; 3615 SuperClassGV = CGM.getModule().getGlobalVariable(SuperClassName); 3616 if (!SuperClassGV) { 3617 SuperClassGV = 3618 new llvm::GlobalVariable(ObjCTypes.ClassnfABITy, false, 3619 llvm::GlobalValue::ExternalLinkage, 3620 0, 3621 SuperClassName, 3622 &CGM.getModule()); 3623 UsedGlobals.push_back(SuperClassGV); 3624 } 3625 IsAGV = SuperClassGV; 3626 } 3627 llvm::GlobalVariable *CLASS_RO_GV = BuildClassRoTInitializer(flags, 3628 InstanceStart, 3629 InstanceSize,ID); 3630 std::string TClassName = ObjCMetaClassName + ClassName; 3631 llvm::GlobalVariable *MetaTClass = 3632 BuildClassMetaData(TClassName, IsAGV, SuperClassGV, CLASS_RO_GV, 3633 classIsHidden); 3634 3635 // Metadata for the class 3636 flags = CLS; 3637 if (classIsHidden) 3638 flags |= OBJC2_CLS_HIDDEN; 3639 if (!ID->getClassInterface()->getSuperClass()) { 3640 flags |= CLS_ROOT; 3641 SuperClassGV = 0; 3642 } 3643 else { 3644 // Has a root. Current class is not a root. 3645 std::string RootClassName = 3646 ID->getClassInterface()->getSuperClass()->getNameAsString(); 3647 std::string SuperClassName = ObjCClassName + RootClassName; 3648 SuperClassGV = CGM.getModule().getGlobalVariable(SuperClassName); 3649 if (!SuperClassGV) { 3650 SuperClassGV = 3651 new llvm::GlobalVariable(ObjCTypes.ClassnfABITy, false, 3652 llvm::GlobalValue::ExternalLinkage, 3653 0, 3654 SuperClassName, 3655 &CGM.getModule()); 3656 UsedGlobals.push_back(SuperClassGV); 3657 } 3658 } 3659 3660 InstanceStart = InstanceSize = 0; 3661 if (ObjCInterfaceDecl *OID = 3662 const_cast<ObjCInterfaceDecl*>(ID->getClassInterface())) { 3663 // FIXME. Share this with the one in EmitIvarList. 3664 const llvm::Type *InterfaceTy = 3665 CGM.getTypes().ConvertType(CGM.getContext().getObjCInterfaceType(OID)); 3666 const llvm::StructLayout *Layout = 3667 CGM.getTargetData().getStructLayout(cast<llvm::StructType>(InterfaceTy)); 3668 3669 RecordDecl::field_iterator firstField, lastField; 3670 const RecordDecl *RD = GetFirstIvarInRecord(OID, firstField, lastField); 3671 3672 for (RecordDecl::field_iterator e = RD->field_end(), 3673 ifield = firstField; ifield != e; ++ifield) 3674 lastField = ifield; 3675 3676 if (lastField != RD->field_end()) { 3677 FieldDecl *Field = *lastField; 3678 const llvm::Type *FieldTy = 3679 CGM.getTypes().ConvertTypeForMem(Field->getType()); 3680 unsigned Size = CGM.getTargetData().getTypePaddedSize(FieldTy); 3681 InstanceSize = Layout->getElementOffset( 3682 CGM.getTypes().getLLVMFieldNo(Field)) + 3683 Size; 3684 if (firstField == RD->field_end()) 3685 InstanceStart = InstanceSize; 3686 else 3687 InstanceStart = Layout->getElementOffset(CGM.getTypes(). 3688 getLLVMFieldNo(*firstField)); 3689 } 3690 } 3691 CLASS_RO_GV = BuildClassRoTInitializer(flags, 3692 InstanceStart, 3693 InstanceSize, 3694 ID); 3695 3696 TClassName = ObjCClassName + ClassName; 3697 llvm::GlobalVariable *ClassMD = 3698 BuildClassMetaData(TClassName, MetaTClass, SuperClassGV, CLASS_RO_GV, 3699 classIsHidden); 3700 DefinedClasses.push_back(ClassMD); 3701} 3702 3703/// GenerateProtocolRef - This routine is called to generate code for 3704/// a protocol reference expression; as in: 3705/// @code 3706/// @protocol(Proto1); 3707/// @endcode 3708/// It generates a weak reference to l_OBJC_PROTOCOL_REFERENCE_$_Proto1 3709/// which will hold address of the protocol meta-data. 3710/// 3711llvm::Value *CGObjCNonFragileABIMac::GenerateProtocolRef(CGBuilderTy &Builder, 3712 const ObjCProtocolDecl *PD) { 3713 3714 llvm::Constant *Init = llvm::ConstantExpr::getBitCast(GetProtocolRef(PD), 3715 ObjCTypes.ExternalProtocolPtrTy); 3716 3717 std::string ProtocolName("\01l_OBJC_PROTOCOL_REFERENCE_$_"); 3718 ProtocolName += PD->getNameAsCString(); 3719 3720 llvm::GlobalVariable *PTGV = CGM.getModule().getGlobalVariable(ProtocolName); 3721 if (PTGV) 3722 return Builder.CreateLoad(PTGV, false, "tmp"); 3723 PTGV = new llvm::GlobalVariable( 3724 Init->getType(), false, 3725 llvm::GlobalValue::WeakLinkage, 3726 Init, 3727 ProtocolName, 3728 &CGM.getModule()); 3729 PTGV->setSection("__DATA, __objc_protorefs, coalesced, no_dead_strip"); 3730 PTGV->setVisibility(llvm::GlobalValue::HiddenVisibility); 3731 UsedGlobals.push_back(PTGV); 3732 return Builder.CreateLoad(PTGV, false, "tmp"); 3733} 3734 3735/// GenerateCategory - Build metadata for a category implementation. 3736/// struct _category_t { 3737/// const char * const name; 3738/// struct _class_t *const cls; 3739/// const struct _method_list_t * const instance_methods; 3740/// const struct _method_list_t * const class_methods; 3741/// const struct _protocol_list_t * const protocols; 3742/// const struct _prop_list_t * const properties; 3743/// } 3744/// 3745void CGObjCNonFragileABIMac::GenerateCategory(const ObjCCategoryImplDecl *OCD) 3746{ 3747 const ObjCInterfaceDecl *Interface = OCD->getClassInterface(); 3748 const char *Prefix = "\01l_OBJC_$_CATEGORY_"; 3749 std::string ExtCatName(Prefix + Interface->getNameAsString()+ 3750 "_$_" + OCD->getNameAsString()); 3751 std::string ExtClassName("\01_OBJC_CLASS_$_" + Interface->getNameAsString()); 3752 3753 std::vector<llvm::Constant*> Values(6); 3754 Values[0] = GetClassName(OCD->getIdentifier()); 3755 // meta-class entry symbol 3756 llvm::GlobalVariable *ClassGV = 3757 CGM.getModule().getGlobalVariable(ExtClassName); 3758 if (!ClassGV) 3759 ClassGV = 3760 new llvm::GlobalVariable(ObjCTypes.ClassnfABITy, false, 3761 llvm::GlobalValue::ExternalLinkage, 3762 0, 3763 ExtClassName, 3764 &CGM.getModule()); 3765 UsedGlobals.push_back(ClassGV); 3766 Values[1] = ClassGV; 3767 std::vector<llvm::Constant*> Methods; 3768 std::string MethodListName(Prefix); 3769 MethodListName += "INSTANCE_METHODS_" + Interface->getNameAsString() + 3770 "_$_" + OCD->getNameAsString(); 3771 3772 for (ObjCCategoryImplDecl::instmeth_iterator i = OCD->instmeth_begin(), 3773 e = OCD->instmeth_end(); i != e; ++i) { 3774 // Instance methods should always be defined. 3775 Methods.push_back(GetMethodConstant(*i)); 3776 } 3777 3778 Values[2] = EmitMethodList(MethodListName, 3779 "__DATA, __objc_const", 3780 Methods); 3781 3782 MethodListName = Prefix; 3783 MethodListName += "CLASS_METHODS_" + Interface->getNameAsString() + "_$_" + 3784 OCD->getNameAsString(); 3785 Methods.clear(); 3786 for (ObjCCategoryImplDecl::classmeth_iterator i = OCD->classmeth_begin(), 3787 e = OCD->classmeth_end(); i != e; ++i) { 3788 // Class methods should always be defined. 3789 Methods.push_back(GetMethodConstant(*i)); 3790 } 3791 3792 Values[3] = EmitMethodList(MethodListName, 3793 "__DATA, __objc_const", 3794 Methods); 3795 const ObjCCategoryDecl *Category = 3796 Interface->FindCategoryDeclaration(OCD->getIdentifier()); 3797 Values[4] = EmitProtocolList("\01l_OBJC_CATEGORY_PROTOCOLS_$_" 3798 + Interface->getNameAsString() + "_$_" 3799 + Category->getNameAsString(), 3800 Category->protocol_begin(), 3801 Category->protocol_end()); 3802 3803 std::string ExtName(Interface->getNameAsString() + "_$_" + 3804 OCD->getNameAsString()); 3805 Values[5] = 3806 EmitPropertyList(std::string("\01l_OBJC_$_PROP_LIST_") + ExtName, 3807 OCD, Category, ObjCTypes); 3808 llvm::Constant *Init = 3809 llvm::ConstantStruct::get(ObjCTypes.CategorynfABITy, 3810 Values); 3811 llvm::GlobalVariable *GCATV 3812 = new llvm::GlobalVariable(ObjCTypes.CategorynfABITy, 3813 false, 3814 llvm::GlobalValue::InternalLinkage, 3815 Init, 3816 ExtCatName, 3817 &CGM.getModule()); 3818 GCATV->setAlignment( 3819 CGM.getTargetData().getPrefTypeAlignment(ObjCTypes.CategorynfABITy)); 3820 GCATV->setSection("__DATA, __objc_const"); 3821 UsedGlobals.push_back(GCATV); 3822 DefinedCategories.push_back(GCATV); 3823} 3824 3825/// GetMethodConstant - Return a struct objc_method constant for the 3826/// given method if it has been defined. The result is null if the 3827/// method has not been defined. The return value has type MethodPtrTy. 3828llvm::Constant *CGObjCNonFragileABIMac::GetMethodConstant( 3829 const ObjCMethodDecl *MD) { 3830 // FIXME: Use DenseMap::lookup 3831 llvm::Function *Fn = MethodDefinitions[MD]; 3832 if (!Fn) 3833 return 0; 3834 3835 std::vector<llvm::Constant*> Method(3); 3836 Method[0] = 3837 llvm::ConstantExpr::getBitCast(GetMethodVarName(MD->getSelector()), 3838 ObjCTypes.SelectorPtrTy); 3839 Method[1] = GetMethodVarType(MD); 3840 Method[2] = llvm::ConstantExpr::getBitCast(Fn, ObjCTypes.Int8PtrTy); 3841 return llvm::ConstantStruct::get(ObjCTypes.MethodTy, Method); 3842} 3843 3844/// EmitMethodList - Build meta-data for method declarations 3845/// struct _method_list_t { 3846/// uint32_t entsize; // sizeof(struct _objc_method) 3847/// uint32_t method_count; 3848/// struct _objc_method method_list[method_count]; 3849/// } 3850/// 3851llvm::Constant *CGObjCNonFragileABIMac::EmitMethodList( 3852 const std::string &Name, 3853 const char *Section, 3854 const ConstantVector &Methods) { 3855 // Return null for empty list. 3856 if (Methods.empty()) 3857 return llvm::Constant::getNullValue(ObjCTypes.MethodListnfABIPtrTy); 3858 3859 std::vector<llvm::Constant*> Values(3); 3860 // sizeof(struct _objc_method) 3861 unsigned Size = CGM.getTargetData().getTypePaddedSize(ObjCTypes.MethodTy); 3862 Values[0] = llvm::ConstantInt::get(ObjCTypes.IntTy, Size); 3863 // method_count 3864 Values[1] = llvm::ConstantInt::get(ObjCTypes.IntTy, Methods.size()); 3865 llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.MethodTy, 3866 Methods.size()); 3867 Values[2] = llvm::ConstantArray::get(AT, Methods); 3868 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 3869 3870 llvm::GlobalVariable *GV = 3871 new llvm::GlobalVariable(Init->getType(), false, 3872 llvm::GlobalValue::InternalLinkage, 3873 Init, 3874 Name, 3875 &CGM.getModule()); 3876 GV->setAlignment( 3877 CGM.getTargetData().getPrefTypeAlignment(Init->getType())); 3878 GV->setSection(Section); 3879 UsedGlobals.push_back(GV); 3880 return llvm::ConstantExpr::getBitCast(GV, 3881 ObjCTypes.MethodListnfABIPtrTy); 3882} 3883 3884llvm::Constant * CGObjCNonFragileABIMac::EmitIvarOffsetVar( 3885 const ObjCImplementationDecl *ID, 3886 const ObjCIvarDecl *Ivar, 3887 unsigned long int Offset) { 3888 3889 std::string ExternalName("\01_OBJC_IVAR_$_" + ID->getNameAsString() + '.' 3890 + Ivar->getNameAsString()); 3891 llvm::Constant *Init = llvm::ConstantInt::get(ObjCTypes.LongTy, Offset); 3892 3893 llvm::GlobalVariable *IvarOffsetGV = 3894 CGM.getModule().getGlobalVariable(ExternalName); 3895 if (IvarOffsetGV) { 3896 // ivar offset symbol already built due to user code referencing it. 3897 IvarOffsetGV->setAlignment( 3898 CGM.getTargetData().getPrefTypeAlignment(ObjCTypes.LongTy)); 3899 IvarOffsetGV->setInitializer(Init); 3900 IvarOffsetGV->setSection("__DATA, __objc_const"); 3901 UsedGlobals.push_back(IvarOffsetGV); 3902 return IvarOffsetGV; 3903 } 3904 3905 IvarOffsetGV = 3906 new llvm::GlobalVariable(Init->getType(), 3907 false, 3908 llvm::GlobalValue::ExternalLinkage, 3909 Init, 3910 ExternalName, 3911 &CGM.getModule()); 3912 IvarOffsetGV->setAlignment( 3913 CGM.getTargetData().getPrefTypeAlignment(ObjCTypes.LongTy)); 3914 // @private and @package have hidden visibility. 3915 bool globalVisibility = (Ivar->getAccessControl() == ObjCIvarDecl::Public || 3916 Ivar->getAccessControl() == ObjCIvarDecl::Protected); 3917 if (!globalVisibility) 3918 IvarOffsetGV->setVisibility(llvm::GlobalValue::HiddenVisibility); 3919 else 3920 if (const ObjCInterfaceDecl *OID = ID->getClassInterface()) 3921 if (IsClassHidden(OID)) 3922 IvarOffsetGV->setVisibility(llvm::GlobalValue::HiddenVisibility); 3923 3924 IvarOffsetGV->setSection("__DATA, __objc_const"); 3925 UsedGlobals.push_back(IvarOffsetGV); 3926 return IvarOffsetGV; 3927} 3928 3929/// EmitIvarList - Emit the ivar list for the given 3930/// implementation. If ForClass is true the list of class ivars 3931/// (i.e. metaclass ivars) is emitted, otherwise the list of 3932/// interface ivars will be emitted. The return value has type 3933/// IvarListnfABIPtrTy. 3934/// struct _ivar_t { 3935/// unsigned long int *offset; // pointer to ivar offset location 3936/// char *name; 3937/// char *type; 3938/// uint32_t alignment; 3939/// uint32_t size; 3940/// } 3941/// struct _ivar_list_t { 3942/// uint32 entsize; // sizeof(struct _ivar_t) 3943/// uint32 count; 3944/// struct _iver_t list[count]; 3945/// } 3946/// 3947llvm::Constant *CGObjCNonFragileABIMac::EmitIvarList( 3948 const ObjCImplementationDecl *ID) { 3949 3950 std::vector<llvm::Constant*> Ivars, Ivar(5); 3951 3952 const ObjCInterfaceDecl *OID = ID->getClassInterface(); 3953 assert(OID && "CGObjCNonFragileABIMac::EmitIvarList - null interface"); 3954 3955 // FIXME. Consolidate this with similar code in GenerateClass. 3956 const llvm::Type *InterfaceTy = 3957 CGM.getTypes().ConvertType(CGM.getContext().getObjCInterfaceType( 3958 const_cast<ObjCInterfaceDecl*>(OID))); 3959 const llvm::StructLayout *Layout = 3960 CGM.getTargetData().getStructLayout(cast<llvm::StructType>(InterfaceTy)); 3961 3962 RecordDecl::field_iterator i,p; 3963 const RecordDecl *RD = GetFirstIvarInRecord(OID, i,p); 3964 ObjCInterfaceDecl::ivar_iterator I = OID->ivar_begin(); 3965 3966 for (RecordDecl::field_iterator e = RD->field_end(); i != e; ++i) { 3967 FieldDecl *Field = *i; 3968 unsigned long offset = Layout->getElementOffset(CGM.getTypes(). 3969 getLLVMFieldNo(Field)); 3970 const ObjCIvarDecl *ivarDecl = *I++; 3971 Ivar[0] = EmitIvarOffsetVar(ID, ivarDecl, offset); 3972 if (Field->getIdentifier()) 3973 Ivar[1] = GetMethodVarName(Field->getIdentifier()); 3974 else 3975 Ivar[1] = llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy); 3976 std::string TypeStr; 3977 CGM.getContext().getObjCEncodingForType(Field->getType(), TypeStr, Field); 3978 Ivar[2] = GetMethodVarType(TypeStr); 3979 const llvm::Type *FieldTy = 3980 CGM.getTypes().ConvertTypeForMem(Field->getType()); 3981 unsigned Size = CGM.getTargetData().getTypePaddedSize(FieldTy); 3982 unsigned Align = CGM.getContext().getPreferredTypeAlign( 3983 Field->getType().getTypePtr()) >> 3; 3984 Align = llvm::Log2_32(Align); 3985 Ivar[3] = llvm::ConstantInt::get(ObjCTypes.IntTy, Align); 3986 // NOTE. Size of a bitfield does not match gcc's, because of the way 3987 // bitfields are treated special in each. But I am told that 'size' 3988 // for bitfield ivars is ignored by the runtime so it does not matter. 3989 // (even if it matters, some day, there is enough info. to get the bitfield 3990 // right! 3991 Ivar[4] = llvm::ConstantInt::get(ObjCTypes.IntTy, Size); 3992 Ivars.push_back(llvm::ConstantStruct::get(ObjCTypes.IvarnfABITy, Ivar)); 3993 } 3994 // Return null for empty list. 3995 if (Ivars.empty()) 3996 return llvm::Constant::getNullValue(ObjCTypes.IvarListnfABIPtrTy); 3997 std::vector<llvm::Constant*> Values(3); 3998 unsigned Size = CGM.getTargetData().getTypePaddedSize(ObjCTypes.IvarnfABITy); 3999 Values[0] = llvm::ConstantInt::get(ObjCTypes.IntTy, Size); 4000 Values[1] = llvm::ConstantInt::get(ObjCTypes.IntTy, Ivars.size()); 4001 llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.IvarnfABITy, 4002 Ivars.size()); 4003 Values[2] = llvm::ConstantArray::get(AT, Ivars); 4004 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 4005 const char *Prefix = "\01l_OBJC_$_INSTANCE_VARIABLES_"; 4006 llvm::GlobalVariable *GV = 4007 new llvm::GlobalVariable(Init->getType(), false, 4008 llvm::GlobalValue::InternalLinkage, 4009 Init, 4010 Prefix + OID->getNameAsString(), 4011 &CGM.getModule()); 4012 GV->setAlignment( 4013 CGM.getTargetData().getPrefTypeAlignment(Init->getType())); 4014 GV->setSection("__DATA, __objc_const"); 4015 4016 UsedGlobals.push_back(GV); 4017 return llvm::ConstantExpr::getBitCast(GV, 4018 ObjCTypes.IvarListnfABIPtrTy); 4019} 4020 4021llvm::Constant *CGObjCNonFragileABIMac::GetOrEmitProtocolRef( 4022 const ObjCProtocolDecl *PD) { 4023 llvm::GlobalVariable *&Entry = Protocols[PD->getIdentifier()]; 4024 4025 if (!Entry) { 4026 // We use the initializer as a marker of whether this is a forward 4027 // reference or not. At module finalization we add the empty 4028 // contents for protocols which were referenced but never defined. 4029 Entry = 4030 new llvm::GlobalVariable(ObjCTypes.ProtocolnfABITy, false, 4031 llvm::GlobalValue::ExternalLinkage, 4032 0, 4033 "\01l_OBJC_PROTOCOL_$_" + PD->getNameAsString(), 4034 &CGM.getModule()); 4035 Entry->setSection("__DATA,__datacoal_nt,coalesced"); 4036 UsedGlobals.push_back(Entry); 4037 } 4038 4039 return Entry; 4040} 4041 4042/// GetOrEmitProtocol - Generate the protocol meta-data: 4043/// @code 4044/// struct _protocol_t { 4045/// id isa; // NULL 4046/// const char * const protocol_name; 4047/// const struct _protocol_list_t * protocol_list; // super protocols 4048/// const struct method_list_t * const instance_methods; 4049/// const struct method_list_t * const class_methods; 4050/// const struct method_list_t *optionalInstanceMethods; 4051/// const struct method_list_t *optionalClassMethods; 4052/// const struct _prop_list_t * properties; 4053/// const uint32_t size; // sizeof(struct _protocol_t) 4054/// const uint32_t flags; // = 0 4055/// } 4056/// @endcode 4057/// 4058 4059llvm::Constant *CGObjCNonFragileABIMac::GetOrEmitProtocol( 4060 const ObjCProtocolDecl *PD) { 4061 llvm::GlobalVariable *&Entry = Protocols[PD->getIdentifier()]; 4062 4063 // Early exit if a defining object has already been generated. 4064 if (Entry && Entry->hasInitializer()) 4065 return Entry; 4066 4067 const char *ProtocolName = PD->getNameAsCString(); 4068 4069 // Construct method lists. 4070 std::vector<llvm::Constant*> InstanceMethods, ClassMethods; 4071 std::vector<llvm::Constant*> OptInstanceMethods, OptClassMethods; 4072 for (ObjCProtocolDecl::instmeth_iterator i = PD->instmeth_begin(), 4073 e = PD->instmeth_end(); i != e; ++i) { 4074 ObjCMethodDecl *MD = *i; 4075 llvm::Constant *C = GetMethodDescriptionConstant(MD); 4076 if (MD->getImplementationControl() == ObjCMethodDecl::Optional) { 4077 OptInstanceMethods.push_back(C); 4078 } else { 4079 InstanceMethods.push_back(C); 4080 } 4081 } 4082 4083 for (ObjCProtocolDecl::classmeth_iterator i = PD->classmeth_begin(), 4084 e = PD->classmeth_end(); i != e; ++i) { 4085 ObjCMethodDecl *MD = *i; 4086 llvm::Constant *C = GetMethodDescriptionConstant(MD); 4087 if (MD->getImplementationControl() == ObjCMethodDecl::Optional) { 4088 OptClassMethods.push_back(C); 4089 } else { 4090 ClassMethods.push_back(C); 4091 } 4092 } 4093 4094 std::vector<llvm::Constant*> Values(10); 4095 // isa is NULL 4096 Values[0] = llvm::Constant::getNullValue(ObjCTypes.ObjectPtrTy); 4097 Values[1] = GetClassName(PD->getIdentifier()); 4098 Values[2] = EmitProtocolList( 4099 "\01l_OBJC_$_PROTOCOL_REFS_" + PD->getNameAsString(), 4100 PD->protocol_begin(), 4101 PD->protocol_end()); 4102 4103 Values[3] = EmitMethodList("\01l_OBJC_$_PROTOCOL_INSTANCE_METHODS_" 4104 + PD->getNameAsString(), 4105 "__DATA, __objc_const", 4106 InstanceMethods); 4107 Values[4] = EmitMethodList("\01l_OBJC_$_PROTOCOL_CLASS_METHODS_" 4108 + PD->getNameAsString(), 4109 "__DATA, __objc_const", 4110 ClassMethods); 4111 Values[5] = EmitMethodList("\01l_OBJC_$_PROTOCOL_INSTANCE_METHODS_OPT_" 4112 + PD->getNameAsString(), 4113 "__DATA, __objc_const", 4114 OptInstanceMethods); 4115 Values[6] = EmitMethodList("\01l_OBJC_$_PROTOCOL_CLASS_METHODS_OPT_" 4116 + PD->getNameAsString(), 4117 "__DATA, __objc_const", 4118 OptClassMethods); 4119 Values[7] = EmitPropertyList("\01l_OBJC_$_PROP_LIST_" + PD->getNameAsString(), 4120 0, PD, ObjCTypes); 4121 uint32_t Size = 4122 CGM.getTargetData().getTypePaddedSize(ObjCTypes.ProtocolnfABITy); 4123 Values[8] = llvm::ConstantInt::get(ObjCTypes.IntTy, Size); 4124 Values[9] = llvm::Constant::getNullValue(ObjCTypes.IntTy); 4125 llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.ProtocolnfABITy, 4126 Values); 4127 4128 if (Entry) { 4129 // Already created, fix the linkage and update the initializer. 4130 Entry->setLinkage(llvm::GlobalValue::WeakLinkage); 4131 Entry->setInitializer(Init); 4132 } else { 4133 Entry = 4134 new llvm::GlobalVariable(ObjCTypes.ProtocolnfABITy, false, 4135 llvm::GlobalValue::WeakLinkage, 4136 Init, 4137 std::string("\01l_OBJC_PROTOCOL_$_")+ProtocolName, 4138 &CGM.getModule()); 4139 Entry->setAlignment( 4140 CGM.getTargetData().getPrefTypeAlignment(ObjCTypes.ProtocolnfABITy)); 4141 Entry->setSection("__DATA,__datacoal_nt,coalesced"); 4142 } 4143 Entry->setVisibility(llvm::GlobalValue::HiddenVisibility); 4144 4145 // Use this protocol meta-data to build protocol list table in section 4146 // __DATA, __objc_protolist 4147 llvm::Type *ptype = llvm::PointerType::getUnqual(ObjCTypes.ProtocolnfABITy); 4148 llvm::GlobalVariable *PTGV = new llvm::GlobalVariable( 4149 ptype, false, 4150 llvm::GlobalValue::WeakLinkage, 4151 Entry, 4152 std::string("\01l_OBJC_LABEL_PROTOCOL_$_") 4153 +ProtocolName, 4154 &CGM.getModule()); 4155 PTGV->setAlignment( 4156 CGM.getTargetData().getPrefTypeAlignment(ptype)); 4157 PTGV->setSection("__DATA, __objc_protolist"); 4158 PTGV->setVisibility(llvm::GlobalValue::HiddenVisibility); 4159 UsedGlobals.push_back(PTGV); 4160 return Entry; 4161} 4162 4163/// EmitProtocolList - Generate protocol list meta-data: 4164/// @code 4165/// struct _protocol_list_t { 4166/// long protocol_count; // Note, this is 32/64 bit 4167/// struct _protocol_t[protocol_count]; 4168/// } 4169/// @endcode 4170/// 4171llvm::Constant * 4172CGObjCNonFragileABIMac::EmitProtocolList(const std::string &Name, 4173 ObjCProtocolDecl::protocol_iterator begin, 4174 ObjCProtocolDecl::protocol_iterator end) { 4175 std::vector<llvm::Constant*> ProtocolRefs; 4176 4177 for (; begin != end; ++begin) 4178 ProtocolRefs.push_back(GetProtocolRef(*begin)); // Implemented??? 4179 4180 // Just return null for empty protocol lists 4181 if (ProtocolRefs.empty()) 4182 return llvm::Constant::getNullValue(ObjCTypes.ProtocolListnfABIPtrTy); 4183 4184 llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name, true); 4185 if (GV) 4186 return GV; 4187 // This list is null terminated. 4188 ProtocolRefs.push_back(llvm::Constant::getNullValue( 4189 ObjCTypes.ProtocolListnfABIPtrTy)); 4190 4191 std::vector<llvm::Constant*> Values(2); 4192 Values[0] = llvm::ConstantInt::get(ObjCTypes.LongTy, ProtocolRefs.size() - 1); 4193 Values[1] = 4194 llvm::ConstantArray::get(llvm::ArrayType::get(ObjCTypes.ProtocolListnfABIPtrTy, 4195 ProtocolRefs.size()), 4196 ProtocolRefs); 4197 4198 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 4199 GV = new llvm::GlobalVariable(Init->getType(), false, 4200 llvm::GlobalValue::InternalLinkage, 4201 Init, 4202 Name, 4203 &CGM.getModule()); 4204 GV->setSection("__DATA, __objc_const"); 4205 GV->setAlignment( 4206 CGM.getTargetData().getPrefTypeAlignment(Init->getType())); 4207 UsedGlobals.push_back(GV); 4208 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.ProtocolListnfABIPtrTy); 4209} 4210 4211/// GetMethodDescriptionConstant - This routine build following meta-data: 4212/// struct _objc_method { 4213/// SEL _cmd; 4214/// char *method_type; 4215/// char *_imp; 4216/// } 4217 4218llvm::Constant * 4219CGObjCNonFragileABIMac::GetMethodDescriptionConstant(const ObjCMethodDecl *MD) { 4220 std::vector<llvm::Constant*> Desc(3); 4221 Desc[0] = llvm::ConstantExpr::getBitCast(GetMethodVarName(MD->getSelector()), 4222 ObjCTypes.SelectorPtrTy); 4223 Desc[1] = GetMethodVarType(MD); 4224 // Protocol methods have no implementation. So, this entry is always NULL. 4225 Desc[2] = llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy); 4226 return llvm::ConstantStruct::get(ObjCTypes.MethodTy, Desc); 4227} 4228 4229/// EmitObjCValueForIvar - Code Gen for nonfragile ivar reference. 4230/// This code gen. amounts to generating code for: 4231/// @code 4232/// (type *)((char *)base + _OBJC_IVAR_$_.ivar; 4233/// @encode 4234/// 4235LValue CGObjCNonFragileABIMac::EmitObjCValueForIvar( 4236 CodeGen::CodeGenFunction &CGF, 4237 QualType ObjectTy, 4238 llvm::Value *BaseValue, 4239 const ObjCIvarDecl *Ivar, 4240 const FieldDecl *Field, 4241 unsigned CVRQualifiers) { 4242 assert(ObjectTy->isObjCInterfaceType() && 4243 "CGObjCNonFragileABIMac::EmitObjCValueForIvar"); 4244 NamedDecl *ID = ObjectTy->getAsObjCInterfaceType()->getDecl(); 4245 // NOTE. This name must match one in EmitIvarOffsetVar. 4246 // FIXME. Consolidate into one naming routine. 4247 std::string ExternalName("\01_OBJC_IVAR_$_" + ID->getNameAsString() + '.' 4248 + Ivar->getNameAsString()); 4249 4250 llvm::GlobalVariable *IvarOffsetGV = 4251 CGM.getModule().getGlobalVariable(ExternalName); 4252 if (!IvarOffsetGV) 4253 IvarOffsetGV = 4254 new llvm::GlobalVariable(ObjCTypes.LongTy, 4255 false, 4256 llvm::GlobalValue::ExternalLinkage, 4257 0, 4258 ExternalName, 4259 &CGM.getModule()); 4260 4261 // (char *) BaseValue 4262 llvm::Value *V = CGF.Builder.CreateBitCast(BaseValue, 4263 ObjCTypes.Int8PtrTy); 4264 llvm::Value *Offset = CGF.Builder.CreateLoad(IvarOffsetGV); 4265 // (char*)BaseValue + Offset_symbol 4266 V = CGF.Builder.CreateGEP(V, Offset, "add.ptr"); 4267 // (type *)((char*)BaseValue + Offset_symbol) 4268 const llvm::Type *IvarTy = 4269 CGM.getTypes().ConvertType(Ivar->getType()); 4270 llvm::Type *ptrIvarTy = llvm::PointerType::getUnqual(IvarTy); 4271 V = CGF.Builder.CreateBitCast(V, ptrIvarTy); 4272 4273 if (Ivar->isBitField()) 4274 return CGF.EmitLValueForBitfield(V, const_cast<FieldDecl *>(Field), 4275 CVRQualifiers); 4276 4277 LValue LV = LValue::MakeAddr(V, 4278 Ivar->getType().getCVRQualifiers()|CVRQualifiers); 4279 LValue::SetObjCIvar(LV, true); 4280 return LV; 4281} 4282 4283CodeGen::RValue CGObjCNonFragileABIMac::EmitMessageSend( 4284 CodeGen::CodeGenFunction &CGF, 4285 QualType ResultType, 4286 Selector Sel, 4287 llvm::Value *Receiver, 4288 QualType Arg0Ty, 4289 bool IsSuper, 4290 const CallArgList &CallArgs) { 4291 // FIXME. Even though IsSuper is passes. This function doese not 4292 // handle calls to 'super' receivers. 4293 CodeGenTypes &Types = CGM.getTypes(); 4294 llvm::Value *Arg0 = Receiver; 4295 if (!IsSuper) 4296 Arg0 = CGF.Builder.CreateBitCast(Arg0, ObjCTypes.ObjectPtrTy, "tmp"); 4297 4298 // Find the message function name. 4299 // FIXME. This is too much work to get the ABI-specific result type 4300 // needed to find the message name. 4301 const CGFunctionInfo &FnInfo = Types.getFunctionInfo(ResultType, 4302 llvm::SmallVector<QualType, 16>()); 4303 llvm::Constant *Fn; 4304 std::string Name("\01l_"); 4305 if (CGM.ReturnTypeUsesSret(FnInfo)) { 4306#if 0 4307 // unlike what is documented. gcc never generates this API!! 4308 if (Receiver->getType() == ObjCTypes.ObjectPtrTy) { 4309 Fn = ObjCTypes.MessageSendIdStretFixupFn; 4310 // FIXME. Is there a better way of getting these names. 4311 // They are available in RuntimeFunctions vector pair. 4312 Name += "objc_msgSendId_stret_fixup"; 4313 } 4314 else 4315#endif 4316 if (IsSuper) { 4317 Fn = ObjCTypes.MessageSendSuper2StretFixupFn; 4318 Name += "objc_msgSendSuper2_stret_fixup"; 4319 } 4320 else 4321 { 4322 Fn = ObjCTypes.MessageSendStretFixupFn; 4323 Name += "objc_msgSend_stret_fixup"; 4324 } 4325 } 4326 else if (ResultType->isFloatingType() && 4327 // Selection of frret API only happens in 32bit nonfragile ABI. 4328 CGM.getTargetData().getTypePaddedSize(ObjCTypes.LongTy) == 4) { 4329 Fn = ObjCTypes.MessageSendFpretFixupFn; 4330 Name += "objc_msgSend_fpret_fixup"; 4331 } 4332 else { 4333#if 0 4334// unlike what is documented. gcc never generates this API!! 4335 if (Receiver->getType() == ObjCTypes.ObjectPtrTy) { 4336 Fn = ObjCTypes.MessageSendIdFixupFn; 4337 Name += "objc_msgSendId_fixup"; 4338 } 4339 else 4340#endif 4341 if (IsSuper) { 4342 Fn = ObjCTypes.MessageSendSuper2FixupFn; 4343 Name += "objc_msgSendSuper2_fixup"; 4344 } 4345 else 4346 { 4347 Fn = ObjCTypes.MessageSendFixupFn; 4348 Name += "objc_msgSend_fixup"; 4349 } 4350 } 4351 Name += '_'; 4352 std::string SelName(Sel.getAsString()); 4353 // Replace all ':' in selector name with '_' ouch! 4354 for(unsigned i = 0; i < SelName.size(); i++) 4355 if (SelName[i] == ':') 4356 SelName[i] = '_'; 4357 Name += SelName; 4358 llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name); 4359 if (!GV) { 4360 // Build messafe ref table entry. 4361 std::vector<llvm::Constant*> Values(2); 4362 Values[0] = Fn; 4363 Values[1] = GetMethodVarName(Sel); 4364 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 4365 GV = new llvm::GlobalVariable(Init->getType(), false, 4366 llvm::GlobalValue::WeakLinkage, 4367 Init, 4368 Name, 4369 &CGM.getModule()); 4370 GV->setVisibility(llvm::GlobalValue::HiddenVisibility); 4371 GV->setAlignment( 4372 CGM.getTargetData().getPrefTypeAlignment(ObjCTypes.MessageRefTy)); 4373 GV->setSection("__DATA, __objc_msgrefs, coalesced"); 4374 UsedGlobals.push_back(GV); 4375 } 4376 llvm::Value *Arg1 = CGF.Builder.CreateBitCast(GV, ObjCTypes.MessageRefPtrTy); 4377 4378 CallArgList ActualArgs; 4379 ActualArgs.push_back(std::make_pair(RValue::get(Arg0), Arg0Ty)); 4380 ActualArgs.push_back(std::make_pair(RValue::get(Arg1), 4381 ObjCTypes.MessageRefCPtrTy)); 4382 ActualArgs.insert(ActualArgs.end(), CallArgs.begin(), CallArgs.end()); 4383 const CGFunctionInfo &FnInfo1 = Types.getFunctionInfo(ResultType, ActualArgs); 4384 llvm::Value *Callee = CGF.Builder.CreateStructGEP(Arg1, 0); 4385 Callee = CGF.Builder.CreateLoad(Callee); 4386 const llvm::FunctionType *FTy = Types.GetFunctionType(FnInfo1, false); 4387 Callee = CGF.Builder.CreateBitCast(Callee, 4388 llvm::PointerType::getUnqual(FTy)); 4389 return CGF.EmitCall(FnInfo1, Callee, ActualArgs); 4390} 4391 4392/// Generate code for a message send expression in the nonfragile abi. 4393CodeGen::RValue CGObjCNonFragileABIMac::GenerateMessageSend( 4394 CodeGen::CodeGenFunction &CGF, 4395 QualType ResultType, 4396 Selector Sel, 4397 llvm::Value *Receiver, 4398 bool IsClassMessage, 4399 const CallArgList &CallArgs) { 4400 return EmitMessageSend(CGF, ResultType, Sel, 4401 Receiver, CGF.getContext().getObjCIdType(), 4402 false, CallArgs); 4403} 4404 4405llvm::Value *CGObjCNonFragileABIMac::EmitClassRef(CGBuilderTy &Builder, 4406 const ObjCInterfaceDecl *ID, 4407 bool IsSuper) { 4408 4409 llvm::GlobalVariable *&Entry = ClassReferences[ID->getIdentifier()]; 4410 4411 if (!Entry) { 4412 std::string ClassName("\01_OBJC_CLASS_$_" + ID->getNameAsString()); 4413 llvm::GlobalVariable *ClassGV = 4414 CGM.getModule().getGlobalVariable(ClassName); 4415 if (!ClassGV) { 4416 ClassGV = 4417 new llvm::GlobalVariable(ObjCTypes.ClassnfABITy, false, 4418 llvm::GlobalValue::ExternalLinkage, 4419 0, 4420 ClassName, 4421 &CGM.getModule()); 4422 UsedGlobals.push_back(ClassGV); 4423 } 4424 Entry = 4425 new llvm::GlobalVariable(ObjCTypes.ClassnfABIPtrTy, false, 4426 llvm::GlobalValue::InternalLinkage, 4427 ClassGV, 4428 IsSuper ? "\01L_OBJC_CLASSLIST_SUP_REFS_$_" 4429 : "\01L_OBJC_CLASSLIST_REFERENCES_$_", 4430 &CGM.getModule()); 4431 Entry->setAlignment( 4432 CGM.getTargetData().getPrefTypeAlignment( 4433 ObjCTypes.ClassnfABIPtrTy)); 4434 4435 if (IsSuper) 4436 Entry->setSection("__OBJC,__objc_superrefs,regular,no_dead_strip"); 4437 else 4438 Entry->setSection("__OBJC,__objc_classrefs,regular,no_dead_strip"); 4439 UsedGlobals.push_back(Entry); 4440 } 4441 4442 return Builder.CreateLoad(Entry, false, "tmp"); 4443} 4444 4445/// EmitMetaClassRef - Return a Value * of the address of _class_t 4446/// meta-data 4447/// 4448llvm::Value *CGObjCNonFragileABIMac::EmitMetaClassRef(CGBuilderTy &Builder, 4449 const ObjCInterfaceDecl *ID) { 4450 llvm::GlobalVariable * &Entry = MetaClassReferences[ID->getIdentifier()]; 4451 if (Entry) 4452 return Builder.CreateLoad(Entry, false, "tmp"); 4453 4454 std::string MetaClassName("\01_OBJC_METACLASS_$_" + ID->getNameAsString()); 4455 llvm::GlobalVariable *MetaClassGV = 4456 CGM.getModule().getGlobalVariable(MetaClassName); 4457 if (!MetaClassGV) { 4458 MetaClassGV = 4459 new llvm::GlobalVariable(ObjCTypes.ClassnfABITy, false, 4460 llvm::GlobalValue::ExternalLinkage, 4461 0, 4462 MetaClassName, 4463 &CGM.getModule()); 4464 UsedGlobals.push_back(MetaClassGV); 4465 } 4466 4467 Entry = 4468 new llvm::GlobalVariable(ObjCTypes.ClassnfABIPtrTy, false, 4469 llvm::GlobalValue::InternalLinkage, 4470 MetaClassGV, 4471 "\01L_OBJC_CLASSLIST_SUP_REFS_$_", 4472 &CGM.getModule()); 4473 Entry->setAlignment( 4474 CGM.getTargetData().getPrefTypeAlignment( 4475 ObjCTypes.ClassnfABIPtrTy)); 4476 4477 Entry->setSection("__OBJC,__objc_superrefs,regular,no_dead_strip"); 4478 UsedGlobals.push_back(Entry); 4479 4480 return Builder.CreateLoad(Entry, false, "tmp"); 4481} 4482 4483/// GetClass - Return a reference to the class for the given interface 4484/// decl. 4485llvm::Value *CGObjCNonFragileABIMac::GetClass(CGBuilderTy &Builder, 4486 const ObjCInterfaceDecl *ID) { 4487 return EmitClassRef(Builder, ID); 4488} 4489 4490/// Generates a message send where the super is the receiver. This is 4491/// a message send to self with special delivery semantics indicating 4492/// which class's method should be called. 4493CodeGen::RValue 4494CGObjCNonFragileABIMac::GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF, 4495 QualType ResultType, 4496 Selector Sel, 4497 const ObjCInterfaceDecl *Class, 4498 llvm::Value *Receiver, 4499 bool IsClassMessage, 4500 const CodeGen::CallArgList &CallArgs) { 4501 // ... 4502 // Create and init a super structure; this is a (receiver, class) 4503 // pair we will pass to objc_msgSendSuper. 4504 llvm::Value *ObjCSuper = 4505 CGF.Builder.CreateAlloca(ObjCTypes.SuperTy, 0, "objc_super"); 4506 4507 llvm::Value *ReceiverAsObject = 4508 CGF.Builder.CreateBitCast(Receiver, ObjCTypes.ObjectPtrTy); 4509 CGF.Builder.CreateStore(ReceiverAsObject, 4510 CGF.Builder.CreateStructGEP(ObjCSuper, 0)); 4511 4512 // If this is a class message the metaclass is passed as the target. 4513 llvm::Value *Target = 4514 IsClassMessage ? EmitMetaClassRef(CGF.Builder, Class) 4515 : EmitClassRef(CGF.Builder, Class, true); 4516 4517 // FIXME: We shouldn't need to do this cast, rectify the ASTContext 4518 // and ObjCTypes types. 4519 const llvm::Type *ClassTy = 4520 CGM.getTypes().ConvertType(CGF.getContext().getObjCClassType()); 4521 Target = CGF.Builder.CreateBitCast(Target, ClassTy); 4522 CGF.Builder.CreateStore(Target, 4523 CGF.Builder.CreateStructGEP(ObjCSuper, 1)); 4524 4525 return EmitMessageSend(CGF, ResultType, Sel, 4526 ObjCSuper, ObjCTypes.SuperPtrCTy, 4527 true, CallArgs); 4528} 4529/* *** */ 4530 4531CodeGen::CGObjCRuntime * 4532CodeGen::CreateMacObjCRuntime(CodeGen::CodeGenModule &CGM) { 4533 return new CGObjCMac(CGM); 4534} 4535 4536CodeGen::CGObjCRuntime * 4537CodeGen::CreateMacNonFragileABIObjCRuntime(CodeGen::CodeGenModule &CGM) { 4538 return new CGObjCNonFragileABIMac(CGM); 4539} 4540