CGObjCMac.cpp revision f1690858344968358131f8d5690d9ee458883000
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/Intrinsics.h" 24#include "llvm/Module.h" 25#include "llvm/ADT/DenseSet.h" 26#include "llvm/Target/TargetData.h" 27#include <sstream> 28 29using namespace clang; 30using namespace CodeGen; 31 32namespace { 33 34 typedef std::vector<llvm::Constant*> ConstantVector; 35 36 // FIXME: We should find a nicer way to make the labels for 37 // metadata, string concatenation is lame. 38 39class ObjCCommonTypesHelper { 40protected: 41 CodeGen::CodeGenModule &CGM; 42 43public: 44 const llvm::Type *ShortTy, *IntTy, *LongTy, *LongLongTy; 45 const llvm::Type *Int8PtrTy; 46 47 /// ObjectPtrTy - LLVM type for object handles (typeof(id)) 48 const llvm::Type *ObjectPtrTy; 49 50 /// PtrObjectPtrTy - LLVM type for id * 51 const llvm::Type *PtrObjectPtrTy; 52 53 /// SelectorPtrTy - LLVM type for selector handles (typeof(SEL)) 54 const llvm::Type *SelectorPtrTy; 55 /// ProtocolPtrTy - LLVM type for external protocol handles 56 /// (typeof(Protocol)) 57 const llvm::Type *ExternalProtocolPtrTy; 58 59 // SuperCTy - clang type for struct objc_super. 60 QualType SuperCTy; 61 // SuperPtrCTy - clang type for struct objc_super *. 62 QualType SuperPtrCTy; 63 64 /// SuperTy - LLVM type for struct objc_super. 65 const llvm::StructType *SuperTy; 66 /// SuperPtrTy - LLVM type for struct objc_super *. 67 const llvm::Type *SuperPtrTy; 68 69 /// PropertyTy - LLVM type for struct objc_property (struct _prop_t 70 /// in GCC parlance). 71 const llvm::StructType *PropertyTy; 72 73 /// PropertyListTy - LLVM type for struct objc_property_list 74 /// (_prop_list_t in GCC parlance). 75 const llvm::StructType *PropertyListTy; 76 /// PropertyListPtrTy - LLVM type for struct objc_property_list*. 77 const llvm::Type *PropertyListPtrTy; 78 79 // MethodTy - LLVM type for struct objc_method. 80 const llvm::StructType *MethodTy; 81 82 /// CacheTy - LLVM type for struct objc_cache. 83 const llvm::Type *CacheTy; 84 /// CachePtrTy - LLVM type for struct objc_cache *. 85 const llvm::Type *CachePtrTy; 86 87 llvm::Constant *GetPropertyFn, *SetPropertyFn; 88 89 llvm::Constant *EnumerationMutationFn; 90 91 /// GcReadWeakFn -- LLVM objc_read_weak (id *src) function. 92 llvm::Constant *GcReadWeakFn; 93 94 /// GcAssignWeakFn -- LLVM objc_assign_weak function. 95 llvm::Constant *GcAssignWeakFn; 96 97 /// GcAssignGlobalFn -- LLVM objc_assign_global function. 98 llvm::Constant *GcAssignGlobalFn; 99 100 /// GcAssignIvarFn -- LLVM objc_assign_ivar function. 101 llvm::Constant *GcAssignIvarFn; 102 103 /// GcAssignStrongCastFn -- LLVM objc_assign_strongCast function. 104 llvm::Constant *GcAssignStrongCastFn; 105 106 /// ExceptionThrowFn - LLVM objc_exception_throw function. 107 llvm::Constant *ExceptionThrowFn; 108 109 /// SyncEnterFn - LLVM object_sync_enter function. 110 llvm::Constant *SyncEnterFn; 111 112 /// SyncExitFn - LLVM object_sync_exit function. 113 llvm::Constant *SyncExitFn; 114 115 ObjCCommonTypesHelper(CodeGen::CodeGenModule &cgm); 116 ~ObjCCommonTypesHelper(){} 117}; 118 119/// ObjCTypesHelper - Helper class that encapsulates lazy 120/// construction of varies types used during ObjC generation. 121class ObjCTypesHelper : public ObjCCommonTypesHelper { 122private: 123 124 llvm::Constant *MessageSendFn, *MessageSendStretFn, *MessageSendFpretFn; 125 llvm::Constant *MessageSendSuperFn, *MessageSendSuperStretFn, 126 *MessageSendSuperFpretFn; 127 128public: 129 /// SymtabTy - LLVM type for struct objc_symtab. 130 const llvm::StructType *SymtabTy; 131 /// SymtabPtrTy - LLVM type for struct objc_symtab *. 132 const llvm::Type *SymtabPtrTy; 133 /// ModuleTy - LLVM type for struct objc_module. 134 const llvm::StructType *ModuleTy; 135 136 /// ProtocolTy - LLVM type for struct objc_protocol. 137 const llvm::StructType *ProtocolTy; 138 /// ProtocolPtrTy - LLVM type for struct objc_protocol *. 139 const llvm::Type *ProtocolPtrTy; 140 /// ProtocolExtensionTy - LLVM type for struct 141 /// objc_protocol_extension. 142 const llvm::StructType *ProtocolExtensionTy; 143 /// ProtocolExtensionTy - LLVM type for struct 144 /// objc_protocol_extension *. 145 const llvm::Type *ProtocolExtensionPtrTy; 146 /// MethodDescriptionTy - LLVM type for struct 147 /// objc_method_description. 148 const llvm::StructType *MethodDescriptionTy; 149 /// MethodDescriptionListTy - LLVM type for struct 150 /// objc_method_description_list. 151 const llvm::StructType *MethodDescriptionListTy; 152 /// MethodDescriptionListPtrTy - LLVM type for struct 153 /// objc_method_description_list *. 154 const llvm::Type *MethodDescriptionListPtrTy; 155 /// ProtocolListTy - LLVM type for struct objc_property_list. 156 const llvm::Type *ProtocolListTy; 157 /// ProtocolListPtrTy - LLVM type for struct objc_property_list*. 158 const llvm::Type *ProtocolListPtrTy; 159 /// CategoryTy - LLVM type for struct objc_category. 160 const llvm::StructType *CategoryTy; 161 /// ClassTy - LLVM type for struct objc_class. 162 const llvm::StructType *ClassTy; 163 /// ClassPtrTy - LLVM type for struct objc_class *. 164 const llvm::Type *ClassPtrTy; 165 /// ClassExtensionTy - LLVM type for struct objc_class_ext. 166 const llvm::StructType *ClassExtensionTy; 167 /// ClassExtensionPtrTy - LLVM type for struct objc_class_ext *. 168 const llvm::Type *ClassExtensionPtrTy; 169 // IvarTy - LLVM type for struct objc_ivar. 170 const llvm::StructType *IvarTy; 171 /// IvarListTy - LLVM type for struct objc_ivar_list. 172 const llvm::Type *IvarListTy; 173 /// IvarListPtrTy - LLVM type for struct objc_ivar_list *. 174 const llvm::Type *IvarListPtrTy; 175 /// MethodListTy - LLVM type for struct objc_method_list. 176 const llvm::Type *MethodListTy; 177 /// MethodListPtrTy - LLVM type for struct objc_method_list *. 178 const llvm::Type *MethodListPtrTy; 179 180 /// ExceptionDataTy - LLVM type for struct _objc_exception_data. 181 const llvm::Type *ExceptionDataTy; 182 183 /// ExceptionTryEnterFn - LLVM objc_exception_try_enter function. 184 llvm::Constant *ExceptionTryEnterFn; 185 186 /// ExceptionTryExitFn - LLVM objc_exception_try_exit function. 187 llvm::Constant *ExceptionTryExitFn; 188 189 /// ExceptionExtractFn - LLVM objc_exception_extract function. 190 llvm::Constant *ExceptionExtractFn; 191 192 /// ExceptionMatchFn - LLVM objc_exception_match function. 193 llvm::Constant *ExceptionMatchFn; 194 195 /// SetJmpFn - LLVM _setjmp function. 196 llvm::Constant *SetJmpFn; 197 198public: 199 ObjCTypesHelper(CodeGen::CodeGenModule &cgm); 200 ~ObjCTypesHelper() {} 201 202 203 llvm::Constant *getSendFn(bool IsSuper) { 204 return IsSuper ? MessageSendSuperFn : MessageSendFn; 205 } 206 207 llvm::Constant *getSendStretFn(bool IsSuper) { 208 return IsSuper ? MessageSendSuperStretFn : MessageSendStretFn; 209 } 210 211 llvm::Constant *getSendFpretFn(bool IsSuper) { 212 return IsSuper ? MessageSendSuperFpretFn : MessageSendFpretFn; 213 } 214}; 215 216/// ObjCNonFragileABITypesHelper - will have all types needed by objective-c's 217/// modern abi 218class ObjCNonFragileABITypesHelper : public ObjCCommonTypesHelper { 219public: 220 llvm::Constant *MessageSendFixupFn, *MessageSendFpretFixupFn, 221 *MessageSendStretFixupFn, *MessageSendIdFixupFn, 222 *MessageSendIdStretFixupFn, *MessageSendSuper2FixupFn, 223 *MessageSendSuper2StretFixupFn; 224 225 // MethodListnfABITy - LLVM for struct _method_list_t 226 const llvm::StructType *MethodListnfABITy; 227 228 // MethodListnfABIPtrTy - LLVM for struct _method_list_t* 229 const llvm::Type *MethodListnfABIPtrTy; 230 231 // ProtocolnfABITy = LLVM for struct _protocol_t 232 const llvm::StructType *ProtocolnfABITy; 233 234 // ProtocolnfABIPtrTy = LLVM for struct _protocol_t* 235 const llvm::Type *ProtocolnfABIPtrTy; 236 237 // ProtocolListnfABITy - LLVM for struct _objc_protocol_list 238 const llvm::StructType *ProtocolListnfABITy; 239 240 // ProtocolListnfABIPtrTy - LLVM for struct _objc_protocol_list* 241 const llvm::Type *ProtocolListnfABIPtrTy; 242 243 // ClassnfABITy - LLVM for struct _class_t 244 const llvm::StructType *ClassnfABITy; 245 246 // ClassnfABIPtrTy - LLVM for struct _class_t* 247 const llvm::Type *ClassnfABIPtrTy; 248 249 // IvarnfABITy - LLVM for struct _ivar_t 250 const llvm::StructType *IvarnfABITy; 251 252 // IvarListnfABITy - LLVM for struct _ivar_list_t 253 const llvm::StructType *IvarListnfABITy; 254 255 // IvarListnfABIPtrTy = LLVM for struct _ivar_list_t* 256 const llvm::Type *IvarListnfABIPtrTy; 257 258 // ClassRonfABITy - LLVM for struct _class_ro_t 259 const llvm::StructType *ClassRonfABITy; 260 261 // ImpnfABITy - LLVM for id (*)(id, SEL, ...) 262 const llvm::Type *ImpnfABITy; 263 264 // CategorynfABITy - LLVM for struct _category_t 265 const llvm::StructType *CategorynfABITy; 266 267 // New types for nonfragile abi messaging. 268 269 // MessageRefTy - LLVM for: 270 // struct _message_ref_t { 271 // IMP messenger; 272 // SEL name; 273 // }; 274 const llvm::StructType *MessageRefTy; 275 // MessageRefCTy - clang type for struct _message_ref_t 276 QualType MessageRefCTy; 277 278 // MessageRefPtrTy - LLVM for struct _message_ref_t* 279 const llvm::Type *MessageRefPtrTy; 280 // MessageRefCPtrTy - clang type for struct _message_ref_t* 281 QualType MessageRefCPtrTy; 282 283 // MessengerTy - Type of the messenger (shown as IMP above) 284 const llvm::FunctionType *MessengerTy; 285 286 // SuperMessageRefTy - LLVM for: 287 // struct _super_message_ref_t { 288 // SUPER_IMP messenger; 289 // SEL name; 290 // }; 291 const llvm::StructType *SuperMessageRefTy; 292 293 // SuperMessageRefPtrTy - LLVM for struct _super_message_ref_t* 294 const llvm::Type *SuperMessageRefPtrTy; 295 296 /// EHPersonalityPtr - LLVM value for an i8* to the Objective-C 297 /// exception personality function. 298 llvm::Value *EHPersonalityPtr; 299 300 llvm::Constant *UnwindResumeOrRethrowFn, *ObjCBeginCatchFn, *ObjCEndCatchFn; 301 302 const llvm::StructType *EHTypeTy; 303 const llvm::Type *EHTypePtrTy; 304 305 ObjCNonFragileABITypesHelper(CodeGen::CodeGenModule &cgm); 306 ~ObjCNonFragileABITypesHelper(){} 307}; 308 309class CGObjCCommonMac : public CodeGen::CGObjCRuntime { 310public: 311 // FIXME - accessibility 312 class GC_IVAR { 313 public: 314 unsigned int ivar_bytepos; 315 unsigned int ivar_size; 316 GC_IVAR() : ivar_bytepos(0), ivar_size(0) {} 317 }; 318 319 class SKIP_SCAN { 320 public: 321 unsigned int skip; 322 unsigned int scan; 323 SKIP_SCAN() : skip(0), scan(0) {} 324 }; 325 326protected: 327 CodeGen::CodeGenModule &CGM; 328 // FIXME! May not be needing this after all. 329 unsigned ObjCABI; 330 331 // gc ivar layout bitmap calculation helper caches. 332 llvm::SmallVector<GC_IVAR, 16> SkipIvars; 333 llvm::SmallVector<GC_IVAR, 16> IvarsInfo; 334 llvm::SmallVector<SKIP_SCAN, 32> SkipScanIvars; 335 336 /// LazySymbols - Symbols to generate a lazy reference for. See 337 /// DefinedSymbols and FinishModule(). 338 std::set<IdentifierInfo*> LazySymbols; 339 340 /// DefinedSymbols - External symbols which are defined by this 341 /// module. The symbols in this list and LazySymbols are used to add 342 /// special linker symbols which ensure that Objective-C modules are 343 /// linked properly. 344 std::set<IdentifierInfo*> DefinedSymbols; 345 346 /// ClassNames - uniqued class names. 347 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> ClassNames; 348 349 /// MethodVarNames - uniqued method variable names. 350 llvm::DenseMap<Selector, llvm::GlobalVariable*> MethodVarNames; 351 352 /// MethodVarTypes - uniqued method type signatures. We have to use 353 /// a StringMap here because have no other unique reference. 354 llvm::StringMap<llvm::GlobalVariable*> MethodVarTypes; 355 356 /// MethodDefinitions - map of methods which have been defined in 357 /// this translation unit. 358 llvm::DenseMap<const ObjCMethodDecl*, llvm::Function*> MethodDefinitions; 359 360 /// PropertyNames - uniqued method variable names. 361 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> PropertyNames; 362 363 /// ClassReferences - uniqued class references. 364 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> ClassReferences; 365 366 /// SelectorReferences - uniqued selector references. 367 llvm::DenseMap<Selector, llvm::GlobalVariable*> SelectorReferences; 368 369 /// Protocols - Protocols for which an objc_protocol structure has 370 /// been emitted. Forward declarations are handled by creating an 371 /// empty structure whose initializer is filled in when/if defined. 372 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> Protocols; 373 374 /// DefinedProtocols - Protocols which have actually been 375 /// defined. We should not need this, see FIXME in GenerateProtocol. 376 llvm::DenseSet<IdentifierInfo*> DefinedProtocols; 377 378 /// DefinedClasses - List of defined classes. 379 std::vector<llvm::GlobalValue*> DefinedClasses; 380 381 /// DefinedCategories - List of defined categories. 382 std::vector<llvm::GlobalValue*> DefinedCategories; 383 384 /// UsedGlobals - List of globals to pack into the llvm.used metadata 385 /// to prevent them from being clobbered. 386 std::vector<llvm::GlobalVariable*> UsedGlobals; 387 388 /// GetNameForMethod - Return a name for the given method. 389 /// \param[out] NameOut - The return value. 390 void GetNameForMethod(const ObjCMethodDecl *OMD, 391 const ObjCContainerDecl *CD, 392 std::string &NameOut); 393 394 /// GetMethodVarName - Return a unique constant for the given 395 /// selector's name. The return value has type char *. 396 llvm::Constant *GetMethodVarName(Selector Sel); 397 llvm::Constant *GetMethodVarName(IdentifierInfo *Ident); 398 llvm::Constant *GetMethodVarName(const std::string &Name); 399 400 /// GetMethodVarType - Return a unique constant for the given 401 /// selector's name. The return value has type char *. 402 403 // FIXME: This is a horrible name. 404 llvm::Constant *GetMethodVarType(const ObjCMethodDecl *D); 405 llvm::Constant *GetMethodVarType(FieldDecl *D); 406 407 /// GetPropertyName - Return a unique constant for the given 408 /// name. The return value has type char *. 409 llvm::Constant *GetPropertyName(IdentifierInfo *Ident); 410 411 // FIXME: This can be dropped once string functions are unified. 412 llvm::Constant *GetPropertyTypeString(const ObjCPropertyDecl *PD, 413 const Decl *Container); 414 415 /// GetClassName - Return a unique constant for the given selector's 416 /// name. The return value has type char *. 417 llvm::Constant *GetClassName(IdentifierInfo *Ident); 418 419 /// GetInterfaceDeclStructLayout - Get layout for ivars of given 420 /// interface declaration. 421 const llvm::StructLayout *GetInterfaceDeclStructLayout( 422 const ObjCInterfaceDecl *ID) const; 423 424 /// BuildIvarLayout - Builds ivar layout bitmap for the class 425 /// implementation for the __strong or __weak case. 426 /// 427 llvm::Constant *BuildIvarLayout(const ObjCImplementationDecl *OI, 428 bool ForStrongLayout); 429 430 void BuildAggrIvarLayout(const ObjCInterfaceDecl *OI, 431 const llvm::StructLayout *Layout, 432 const RecordDecl *RD, 433 const llvm::SmallVectorImpl<FieldDecl*> &RecFields, 434 unsigned int BytePos, bool ForStrongLayout, 435 int &Index, int &SkIndex, bool &HasUnion); 436 437 /// GetIvarLayoutName - Returns a unique constant for the given 438 /// ivar layout bitmap. 439 llvm::Constant *GetIvarLayoutName(IdentifierInfo *Ident, 440 const ObjCCommonTypesHelper &ObjCTypes); 441 442 const RecordDecl *GetFirstIvarInRecord(const ObjCInterfaceDecl *OID, 443 RecordDecl::field_iterator &FIV, 444 RecordDecl::field_iterator &PIV); 445 /// EmitPropertyList - Emit the given property list. The return 446 /// value has type PropertyListPtrTy. 447 llvm::Constant *EmitPropertyList(const std::string &Name, 448 const Decl *Container, 449 const ObjCContainerDecl *OCD, 450 const ObjCCommonTypesHelper &ObjCTypes); 451 452 /// GetProtocolRef - Return a reference to the internal protocol 453 /// description, creating an empty one if it has not been 454 /// defined. The return value has type ProtocolPtrTy. 455 llvm::Constant *GetProtocolRef(const ObjCProtocolDecl *PD); 456 457 /// GetIvarBaseOffset - returns ivars byte offset. 458 uint64_t GetIvarBaseOffset(const llvm::StructLayout *Layout, 459 const FieldDecl *Field); 460 461 /// GetFieldBaseOffset - return's field byte offset. 462 uint64_t GetFieldBaseOffset(const ObjCInterfaceDecl *OI, 463 const llvm::StructLayout *Layout, 464 const FieldDecl *Field); 465 466 /// CreateMetadataVar - Create a global variable with internal 467 /// linkage for use by the Objective-C runtime. 468 /// 469 /// This is a convenience wrapper which not only creates the 470 /// variable, but also sets the section and alignment and adds the 471 /// global to the UsedGlobals list. 472 /// 473 /// \param Name - The variable name. 474 /// \param Init - The variable initializer; this is also used to 475 /// define the type of the variable. 476 /// \param Section - The section the variable should go into, or 0. 477 /// \param Align - The alignment for the variable, or 0. 478 /// \param AddToUsed - Whether the variable should be added to 479 /// llvm. 480 llvm::GlobalVariable *CreateMetadataVar(const std::string &Name, 481 llvm::Constant *Init, 482 const char *Section, 483 unsigned Align, 484 bool AddToUsed); 485 486public: 487 CGObjCCommonMac(CodeGen::CodeGenModule &cgm) : CGM(cgm) 488 { } 489 490 virtual llvm::Constant *GenerateConstantString(const std::string &String); 491 492 virtual llvm::Function *GenerateMethod(const ObjCMethodDecl *OMD, 493 const ObjCContainerDecl *CD=0); 494 495 virtual void GenerateProtocol(const ObjCProtocolDecl *PD); 496 497 /// GetOrEmitProtocol - Get the protocol object for the given 498 /// declaration, emitting it if necessary. The return value has type 499 /// ProtocolPtrTy. 500 virtual llvm::Constant *GetOrEmitProtocol(const ObjCProtocolDecl *PD)=0; 501 502 /// GetOrEmitProtocolRef - Get a forward reference to the protocol 503 /// object for the given declaration, emitting it if needed. These 504 /// forward references will be filled in with empty bodies if no 505 /// definition is seen. The return value has type ProtocolPtrTy. 506 virtual llvm::Constant *GetOrEmitProtocolRef(const ObjCProtocolDecl *PD)=0; 507}; 508 509class CGObjCMac : public CGObjCCommonMac { 510private: 511 ObjCTypesHelper ObjCTypes; 512 /// EmitImageInfo - Emit the image info marker used to encode some module 513 /// level information. 514 void EmitImageInfo(); 515 516 /// EmitModuleInfo - Another marker encoding module level 517 /// information. 518 void EmitModuleInfo(); 519 520 /// EmitModuleSymols - Emit module symbols, the list of defined 521 /// classes and categories. The result has type SymtabPtrTy. 522 llvm::Constant *EmitModuleSymbols(); 523 524 /// FinishModule - Write out global data structures at the end of 525 /// processing a translation unit. 526 void FinishModule(); 527 528 /// EmitClassExtension - Generate the class extension structure used 529 /// to store the weak ivar layout and properties. The return value 530 /// has type ClassExtensionPtrTy. 531 llvm::Constant *EmitClassExtension(const ObjCImplementationDecl *ID); 532 533 /// EmitClassRef - Return a Value*, of type ObjCTypes.ClassPtrTy, 534 /// for the given class. 535 llvm::Value *EmitClassRef(CGBuilderTy &Builder, 536 const ObjCInterfaceDecl *ID); 537 538 CodeGen::RValue EmitMessageSend(CodeGen::CodeGenFunction &CGF, 539 QualType ResultType, 540 Selector Sel, 541 llvm::Value *Arg0, 542 QualType Arg0Ty, 543 bool IsSuper, 544 const CallArgList &CallArgs); 545 546 /// EmitIvarList - Emit the ivar list for the given 547 /// implementation. If ForClass is true the list of class ivars 548 /// (i.e. metaclass ivars) is emitted, otherwise the list of 549 /// interface ivars will be emitted. The return value has type 550 /// IvarListPtrTy. 551 llvm::Constant *EmitIvarList(const ObjCImplementationDecl *ID, 552 bool ForClass); 553 554 /// EmitMetaClass - Emit a forward reference to the class structure 555 /// for the metaclass of the given interface. The return value has 556 /// type ClassPtrTy. 557 llvm::Constant *EmitMetaClassRef(const ObjCInterfaceDecl *ID); 558 559 /// EmitMetaClass - Emit a class structure for the metaclass of the 560 /// given implementation. The return value has type ClassPtrTy. 561 llvm::Constant *EmitMetaClass(const ObjCImplementationDecl *ID, 562 llvm::Constant *Protocols, 563 const llvm::Type *InterfaceTy, 564 const ConstantVector &Methods); 565 566 llvm::Constant *GetMethodConstant(const ObjCMethodDecl *MD); 567 568 llvm::Constant *GetMethodDescriptionConstant(const ObjCMethodDecl *MD); 569 570 /// EmitMethodList - Emit the method list for the given 571 /// implementation. The return value has type MethodListPtrTy. 572 llvm::Constant *EmitMethodList(const std::string &Name, 573 const char *Section, 574 const ConstantVector &Methods); 575 576 /// EmitMethodDescList - Emit a method description list for a list of 577 /// method declarations. 578 /// - TypeName: The name for the type containing the methods. 579 /// - IsProtocol: True iff these methods are for a protocol. 580 /// - ClassMethds: True iff these are class methods. 581 /// - Required: When true, only "required" methods are 582 /// listed. Similarly, when false only "optional" methods are 583 /// listed. For classes this should always be true. 584 /// - begin, end: The method list to output. 585 /// 586 /// The return value has type MethodDescriptionListPtrTy. 587 llvm::Constant *EmitMethodDescList(const std::string &Name, 588 const char *Section, 589 const ConstantVector &Methods); 590 591 /// GetOrEmitProtocol - Get the protocol object for the given 592 /// declaration, emitting it if necessary. The return value has type 593 /// ProtocolPtrTy. 594 virtual llvm::Constant *GetOrEmitProtocol(const ObjCProtocolDecl *PD); 595 596 /// GetOrEmitProtocolRef - Get a forward reference to the protocol 597 /// object for the given declaration, emitting it if needed. These 598 /// forward references will be filled in with empty bodies if no 599 /// definition is seen. The return value has type ProtocolPtrTy. 600 virtual llvm::Constant *GetOrEmitProtocolRef(const ObjCProtocolDecl *PD); 601 602 /// EmitProtocolExtension - Generate the protocol extension 603 /// structure used to store optional instance and class methods, and 604 /// protocol properties. The return value has type 605 /// ProtocolExtensionPtrTy. 606 llvm::Constant * 607 EmitProtocolExtension(const ObjCProtocolDecl *PD, 608 const ConstantVector &OptInstanceMethods, 609 const ConstantVector &OptClassMethods); 610 611 /// EmitProtocolList - Generate the list of referenced 612 /// protocols. The return value has type ProtocolListPtrTy. 613 llvm::Constant *EmitProtocolList(const std::string &Name, 614 ObjCProtocolDecl::protocol_iterator begin, 615 ObjCProtocolDecl::protocol_iterator end); 616 617 /// EmitSelector - Return a Value*, of type ObjCTypes.SelectorPtrTy, 618 /// for the given selector. 619 llvm::Value *EmitSelector(CGBuilderTy &Builder, Selector Sel); 620 621 public: 622 CGObjCMac(CodeGen::CodeGenModule &cgm); 623 624 virtual llvm::Function *ModuleInitFunction(); 625 626 virtual CodeGen::RValue GenerateMessageSend(CodeGen::CodeGenFunction &CGF, 627 QualType ResultType, 628 Selector Sel, 629 llvm::Value *Receiver, 630 bool IsClassMessage, 631 const CallArgList &CallArgs); 632 633 virtual CodeGen::RValue 634 GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF, 635 QualType ResultType, 636 Selector Sel, 637 const ObjCInterfaceDecl *Class, 638 bool isCategoryImpl, 639 llvm::Value *Receiver, 640 bool IsClassMessage, 641 const CallArgList &CallArgs); 642 643 virtual llvm::Value *GetClass(CGBuilderTy &Builder, 644 const ObjCInterfaceDecl *ID); 645 646 virtual llvm::Value *GetSelector(CGBuilderTy &Builder, Selector Sel); 647 648 virtual void GenerateCategory(const ObjCCategoryImplDecl *CMD); 649 650 virtual void GenerateClass(const ObjCImplementationDecl *ClassDecl); 651 652 virtual llvm::Value *GenerateProtocolRef(CGBuilderTy &Builder, 653 const ObjCProtocolDecl *PD); 654 655 virtual llvm::Constant *GetPropertyGetFunction(); 656 virtual llvm::Constant *GetPropertySetFunction(); 657 virtual llvm::Constant *EnumerationMutationFunction(); 658 659 virtual void EmitTryOrSynchronizedStmt(CodeGen::CodeGenFunction &CGF, 660 const Stmt &S); 661 virtual void EmitThrowStmt(CodeGen::CodeGenFunction &CGF, 662 const ObjCAtThrowStmt &S); 663 virtual llvm::Value * EmitObjCWeakRead(CodeGen::CodeGenFunction &CGF, 664 llvm::Value *AddrWeakObj); 665 virtual void EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF, 666 llvm::Value *src, llvm::Value *dst); 667 virtual void EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF, 668 llvm::Value *src, llvm::Value *dest); 669 virtual void EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF, 670 llvm::Value *src, llvm::Value *dest); 671 virtual void EmitObjCStrongCastAssign(CodeGen::CodeGenFunction &CGF, 672 llvm::Value *src, llvm::Value *dest); 673 674 virtual LValue EmitObjCValueForIvar(CodeGen::CodeGenFunction &CGF, 675 QualType ObjectTy, 676 llvm::Value *BaseValue, 677 const ObjCIvarDecl *Ivar, 678 const FieldDecl *Field, 679 unsigned CVRQualifiers); 680 virtual llvm::Value *EmitIvarOffset(CodeGen::CodeGenFunction &CGF, 681 ObjCInterfaceDecl *Interface, 682 const ObjCIvarDecl *Ivar); 683}; 684 685class CGObjCNonFragileABIMac : public CGObjCCommonMac { 686private: 687 ObjCNonFragileABITypesHelper ObjCTypes; 688 llvm::GlobalVariable* ObjCEmptyCacheVar; 689 llvm::GlobalVariable* ObjCEmptyVtableVar; 690 691 /// MetaClassReferences - uniqued meta class references. 692 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> MetaClassReferences; 693 694 /// EHTypeReferences - uniqued class ehtype references. 695 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> EHTypeReferences; 696 697 /// FinishNonFragileABIModule - Write out global data structures at the end of 698 /// processing a translation unit. 699 void FinishNonFragileABIModule(); 700 701 llvm::GlobalVariable * BuildClassRoTInitializer(unsigned flags, 702 unsigned InstanceStart, 703 unsigned InstanceSize, 704 const ObjCImplementationDecl *ID); 705 llvm::GlobalVariable * BuildClassMetaData(std::string &ClassName, 706 llvm::Constant *IsAGV, 707 llvm::Constant *SuperClassGV, 708 llvm::Constant *ClassRoGV, 709 bool HiddenVisibility); 710 711 llvm::Constant *GetMethodConstant(const ObjCMethodDecl *MD); 712 713 llvm::Constant *GetMethodDescriptionConstant(const ObjCMethodDecl *MD); 714 715 /// EmitMethodList - Emit the method list for the given 716 /// implementation. The return value has type MethodListnfABITy. 717 llvm::Constant *EmitMethodList(const std::string &Name, 718 const char *Section, 719 const ConstantVector &Methods); 720 /// EmitIvarList - Emit the ivar list for the given 721 /// implementation. If ForClass is true the list of class ivars 722 /// (i.e. metaclass ivars) is emitted, otherwise the list of 723 /// interface ivars will be emitted. The return value has type 724 /// IvarListnfABIPtrTy. 725 llvm::Constant *EmitIvarList(const ObjCImplementationDecl *ID); 726 727 llvm::Constant *EmitIvarOffsetVar(const ObjCInterfaceDecl *ID, 728 const ObjCIvarDecl *Ivar, 729 unsigned long int offset); 730 731 /// GetOrEmitProtocol - Get the protocol object for the given 732 /// declaration, emitting it if necessary. The return value has type 733 /// ProtocolPtrTy. 734 virtual llvm::Constant *GetOrEmitProtocol(const ObjCProtocolDecl *PD); 735 736 /// GetOrEmitProtocolRef - Get a forward reference to the protocol 737 /// object for the given declaration, emitting it if needed. These 738 /// forward references will be filled in with empty bodies if no 739 /// definition is seen. The return value has type ProtocolPtrTy. 740 virtual llvm::Constant *GetOrEmitProtocolRef(const ObjCProtocolDecl *PD); 741 742 /// EmitProtocolList - Generate the list of referenced 743 /// protocols. The return value has type ProtocolListPtrTy. 744 llvm::Constant *EmitProtocolList(const std::string &Name, 745 ObjCProtocolDecl::protocol_iterator begin, 746 ObjCProtocolDecl::protocol_iterator end); 747 748 CodeGen::RValue EmitMessageSend(CodeGen::CodeGenFunction &CGF, 749 QualType ResultType, 750 Selector Sel, 751 llvm::Value *Receiver, 752 QualType Arg0Ty, 753 bool IsSuper, 754 const CallArgList &CallArgs); 755 756 /// GetClassGlobal - Return the global variable for the Objective-C 757 /// class of the given name. 758 llvm::GlobalVariable *GetClassGlobal(const std::string &Name); 759 760 /// EmitClassRef - Return a Value*, of type ObjCTypes.ClassPtrTy, 761 /// for the given class. 762 llvm::Value *EmitClassRef(CGBuilderTy &Builder, 763 const ObjCInterfaceDecl *ID, 764 bool IsSuper = false); 765 766 /// EmitMetaClassRef - Return a Value * of the address of _class_t 767 /// meta-data 768 llvm::Value *EmitMetaClassRef(CGBuilderTy &Builder, 769 const ObjCInterfaceDecl *ID); 770 771 /// ObjCIvarOffsetVariable - Returns the ivar offset variable for 772 /// the given ivar. 773 /// 774 llvm::GlobalVariable * ObjCIvarOffsetVariable(std::string &Name, 775 const ObjCInterfaceDecl *ID, 776 const ObjCIvarDecl *Ivar); 777 778 /// EmitSelector - Return a Value*, of type ObjCTypes.SelectorPtrTy, 779 /// for the given selector. 780 llvm::Value *EmitSelector(CGBuilderTy &Builder, Selector Sel); 781 782 /// GetInterfaceEHType - Get the ehtype for the given Objective-C 783 /// interface. The return value has type EHTypePtrTy. 784 llvm::Value *GetInterfaceEHType(const ObjCInterfaceType *IT); 785 786public: 787 CGObjCNonFragileABIMac(CodeGen::CodeGenModule &cgm); 788 // FIXME. All stubs for now! 789 virtual llvm::Function *ModuleInitFunction(); 790 791 virtual CodeGen::RValue GenerateMessageSend(CodeGen::CodeGenFunction &CGF, 792 QualType ResultType, 793 Selector Sel, 794 llvm::Value *Receiver, 795 bool IsClassMessage, 796 const CallArgList &CallArgs); 797 798 virtual CodeGen::RValue 799 GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF, 800 QualType ResultType, 801 Selector Sel, 802 const ObjCInterfaceDecl *Class, 803 bool isCategoryImpl, 804 llvm::Value *Receiver, 805 bool IsClassMessage, 806 const CallArgList &CallArgs); 807 808 virtual llvm::Value *GetClass(CGBuilderTy &Builder, 809 const ObjCInterfaceDecl *ID); 810 811 virtual llvm::Value *GetSelector(CGBuilderTy &Builder, Selector Sel) 812 { return EmitSelector(Builder, Sel); } 813 814 virtual void GenerateCategory(const ObjCCategoryImplDecl *CMD); 815 816 virtual void GenerateClass(const ObjCImplementationDecl *ClassDecl); 817 virtual llvm::Value *GenerateProtocolRef(CGBuilderTy &Builder, 818 const ObjCProtocolDecl *PD); 819 820 virtual llvm::Constant *GetPropertyGetFunction() { 821 return ObjCTypes.GetPropertyFn; 822 } 823 virtual llvm::Constant *GetPropertySetFunction() { 824 return ObjCTypes.SetPropertyFn; 825 } 826 virtual llvm::Constant *EnumerationMutationFunction() { 827 return ObjCTypes.EnumerationMutationFn; 828 } 829 830 virtual void EmitTryOrSynchronizedStmt(CodeGen::CodeGenFunction &CGF, 831 const Stmt &S); 832 virtual void EmitThrowStmt(CodeGen::CodeGenFunction &CGF, 833 const ObjCAtThrowStmt &S); 834 virtual llvm::Value * EmitObjCWeakRead(CodeGen::CodeGenFunction &CGF, 835 llvm::Value *AddrWeakObj); 836 virtual void EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF, 837 llvm::Value *src, llvm::Value *dst); 838 virtual void EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF, 839 llvm::Value *src, llvm::Value *dest); 840 virtual void EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF, 841 llvm::Value *src, llvm::Value *dest); 842 virtual void EmitObjCStrongCastAssign(CodeGen::CodeGenFunction &CGF, 843 llvm::Value *src, llvm::Value *dest); 844 virtual LValue EmitObjCValueForIvar(CodeGen::CodeGenFunction &CGF, 845 QualType ObjectTy, 846 llvm::Value *BaseValue, 847 const ObjCIvarDecl *Ivar, 848 const FieldDecl *Field, 849 unsigned CVRQualifiers); 850 virtual llvm::Value *EmitIvarOffset(CodeGen::CodeGenFunction &CGF, 851 ObjCInterfaceDecl *Interface, 852 const ObjCIvarDecl *Ivar); 853}; 854 855} // end anonymous namespace 856 857/* *** Helper Functions *** */ 858 859/// getConstantGEP() - Help routine to construct simple GEPs. 860static llvm::Constant *getConstantGEP(llvm::Constant *C, 861 unsigned idx0, 862 unsigned idx1) { 863 llvm::Value *Idxs[] = { 864 llvm::ConstantInt::get(llvm::Type::Int32Ty, idx0), 865 llvm::ConstantInt::get(llvm::Type::Int32Ty, idx1) 866 }; 867 return llvm::ConstantExpr::getGetElementPtr(C, Idxs, 2); 868} 869 870/* *** CGObjCMac Public Interface *** */ 871 872CGObjCMac::CGObjCMac(CodeGen::CodeGenModule &cgm) : CGObjCCommonMac(cgm), 873 ObjCTypes(cgm) 874{ 875 ObjCABI = 1; 876 EmitImageInfo(); 877} 878 879/// GetClass - Return a reference to the class for the given interface 880/// decl. 881llvm::Value *CGObjCMac::GetClass(CGBuilderTy &Builder, 882 const ObjCInterfaceDecl *ID) { 883 return EmitClassRef(Builder, ID); 884} 885 886/// GetSelector - Return the pointer to the unique'd string for this selector. 887llvm::Value *CGObjCMac::GetSelector(CGBuilderTy &Builder, Selector Sel) { 888 return EmitSelector(Builder, Sel); 889} 890 891/// Generate a constant CFString object. 892/* 893 struct __builtin_CFString { 894 const int *isa; // point to __CFConstantStringClassReference 895 int flags; 896 const char *str; 897 long length; 898 }; 899*/ 900 901llvm::Constant *CGObjCCommonMac::GenerateConstantString( 902 const std::string &String) { 903 return CGM.GetAddrOfConstantCFString(String); 904} 905 906/// Generates a message send where the super is the receiver. This is 907/// a message send to self with special delivery semantics indicating 908/// which class's method should be called. 909CodeGen::RValue 910CGObjCMac::GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF, 911 QualType ResultType, 912 Selector Sel, 913 const ObjCInterfaceDecl *Class, 914 bool isCategoryImpl, 915 llvm::Value *Receiver, 916 bool IsClassMessage, 917 const CodeGen::CallArgList &CallArgs) { 918 // Create and init a super structure; this is a (receiver, class) 919 // pair we will pass to objc_msgSendSuper. 920 llvm::Value *ObjCSuper = 921 CGF.Builder.CreateAlloca(ObjCTypes.SuperTy, 0, "objc_super"); 922 llvm::Value *ReceiverAsObject = 923 CGF.Builder.CreateBitCast(Receiver, ObjCTypes.ObjectPtrTy); 924 CGF.Builder.CreateStore(ReceiverAsObject, 925 CGF.Builder.CreateStructGEP(ObjCSuper, 0)); 926 927 // If this is a class message the metaclass is passed as the target. 928 llvm::Value *Target; 929 if (IsClassMessage) { 930 if (isCategoryImpl) { 931 // Message sent to 'super' in a class method defined in a category 932 // implementation requires an odd treatment. 933 // If we are in a class method, we must retrieve the 934 // _metaclass_ for the current class, pointed at by 935 // the class's "isa" pointer. The following assumes that 936 // isa" is the first ivar in a class (which it must be). 937 Target = EmitClassRef(CGF.Builder, Class->getSuperClass()); 938 Target = CGF.Builder.CreateStructGEP(Target, 0); 939 Target = CGF.Builder.CreateLoad(Target); 940 } 941 else { 942 llvm::Value *MetaClassPtr = EmitMetaClassRef(Class); 943 llvm::Value *SuperPtr = CGF.Builder.CreateStructGEP(MetaClassPtr, 1); 944 llvm::Value *Super = CGF.Builder.CreateLoad(SuperPtr); 945 Target = Super; 946 } 947 } else { 948 Target = EmitClassRef(CGF.Builder, Class->getSuperClass()); 949 } 950 // FIXME: We shouldn't need to do this cast, rectify the ASTContext 951 // and ObjCTypes types. 952 const llvm::Type *ClassTy = 953 CGM.getTypes().ConvertType(CGF.getContext().getObjCClassType()); 954 Target = CGF.Builder.CreateBitCast(Target, ClassTy); 955 CGF.Builder.CreateStore(Target, 956 CGF.Builder.CreateStructGEP(ObjCSuper, 1)); 957 958 return EmitMessageSend(CGF, ResultType, Sel, 959 ObjCSuper, ObjCTypes.SuperPtrCTy, 960 true, CallArgs); 961} 962 963/// Generate code for a message send expression. 964CodeGen::RValue CGObjCMac::GenerateMessageSend(CodeGen::CodeGenFunction &CGF, 965 QualType ResultType, 966 Selector Sel, 967 llvm::Value *Receiver, 968 bool IsClassMessage, 969 const CallArgList &CallArgs) { 970 llvm::Value *Arg0 = 971 CGF.Builder.CreateBitCast(Receiver, ObjCTypes.ObjectPtrTy, "tmp"); 972 return EmitMessageSend(CGF, ResultType, Sel, 973 Arg0, CGF.getContext().getObjCIdType(), 974 false, CallArgs); 975} 976 977CodeGen::RValue CGObjCMac::EmitMessageSend(CodeGen::CodeGenFunction &CGF, 978 QualType ResultType, 979 Selector Sel, 980 llvm::Value *Arg0, 981 QualType Arg0Ty, 982 bool IsSuper, 983 const CallArgList &CallArgs) { 984 CallArgList ActualArgs; 985 ActualArgs.push_back(std::make_pair(RValue::get(Arg0), Arg0Ty)); 986 ActualArgs.push_back(std::make_pair(RValue::get(EmitSelector(CGF.Builder, 987 Sel)), 988 CGF.getContext().getObjCSelType())); 989 ActualArgs.insert(ActualArgs.end(), CallArgs.begin(), CallArgs.end()); 990 991 CodeGenTypes &Types = CGM.getTypes(); 992 const CGFunctionInfo &FnInfo = Types.getFunctionInfo(ResultType, ActualArgs); 993 const llvm::FunctionType *FTy = Types.GetFunctionType(FnInfo, false); 994 995 llvm::Constant *Fn; 996 if (CGM.ReturnTypeUsesSret(FnInfo)) { 997 Fn = ObjCTypes.getSendStretFn(IsSuper); 998 } else if (ResultType->isFloatingType()) { 999 // FIXME: Sadly, this is wrong. This actually depends on the 1000 // architecture. This happens to be right for x86-32 though. 1001 Fn = ObjCTypes.getSendFpretFn(IsSuper); 1002 } else { 1003 Fn = ObjCTypes.getSendFn(IsSuper); 1004 } 1005 Fn = llvm::ConstantExpr::getBitCast(Fn, llvm::PointerType::getUnqual(FTy)); 1006 return CGF.EmitCall(FnInfo, Fn, ActualArgs); 1007} 1008 1009llvm::Value *CGObjCMac::GenerateProtocolRef(CGBuilderTy &Builder, 1010 const ObjCProtocolDecl *PD) { 1011 // FIXME: I don't understand why gcc generates this, or where it is 1012 // resolved. Investigate. Its also wasteful to look this up over and 1013 // over. 1014 LazySymbols.insert(&CGM.getContext().Idents.get("Protocol")); 1015 1016 return llvm::ConstantExpr::getBitCast(GetProtocolRef(PD), 1017 ObjCTypes.ExternalProtocolPtrTy); 1018} 1019 1020void CGObjCCommonMac::GenerateProtocol(const ObjCProtocolDecl *PD) { 1021 // FIXME: We shouldn't need this, the protocol decl should contain 1022 // enough information to tell us whether this was a declaration or a 1023 // definition. 1024 DefinedProtocols.insert(PD->getIdentifier()); 1025 1026 // If we have generated a forward reference to this protocol, emit 1027 // it now. Otherwise do nothing, the protocol objects are lazily 1028 // emitted. 1029 if (Protocols.count(PD->getIdentifier())) 1030 GetOrEmitProtocol(PD); 1031} 1032 1033llvm::Constant *CGObjCCommonMac::GetProtocolRef(const ObjCProtocolDecl *PD) { 1034 if (DefinedProtocols.count(PD->getIdentifier())) 1035 return GetOrEmitProtocol(PD); 1036 return GetOrEmitProtocolRef(PD); 1037} 1038 1039/* 1040 // APPLE LOCAL radar 4585769 - Objective-C 1.0 extensions 1041 struct _objc_protocol { 1042 struct _objc_protocol_extension *isa; 1043 char *protocol_name; 1044 struct _objc_protocol_list *protocol_list; 1045 struct _objc__method_prototype_list *instance_methods; 1046 struct _objc__method_prototype_list *class_methods 1047 }; 1048 1049 See EmitProtocolExtension(). 1050*/ 1051llvm::Constant *CGObjCMac::GetOrEmitProtocol(const ObjCProtocolDecl *PD) { 1052 llvm::GlobalVariable *&Entry = Protocols[PD->getIdentifier()]; 1053 1054 // Early exit if a defining object has already been generated. 1055 if (Entry && Entry->hasInitializer()) 1056 return Entry; 1057 1058 // FIXME: I don't understand why gcc generates this, or where it is 1059 // resolved. Investigate. Its also wasteful to look this up over and 1060 // over. 1061 LazySymbols.insert(&CGM.getContext().Idents.get("Protocol")); 1062 1063 const char *ProtocolName = PD->getNameAsCString(); 1064 1065 // Construct method lists. 1066 std::vector<llvm::Constant*> InstanceMethods, ClassMethods; 1067 std::vector<llvm::Constant*> OptInstanceMethods, OptClassMethods; 1068 for (ObjCProtocolDecl::instmeth_iterator i = PD->instmeth_begin(), 1069 e = PD->instmeth_end(); i != e; ++i) { 1070 ObjCMethodDecl *MD = *i; 1071 llvm::Constant *C = GetMethodDescriptionConstant(MD); 1072 if (MD->getImplementationControl() == ObjCMethodDecl::Optional) { 1073 OptInstanceMethods.push_back(C); 1074 } else { 1075 InstanceMethods.push_back(C); 1076 } 1077 } 1078 1079 for (ObjCProtocolDecl::classmeth_iterator i = PD->classmeth_begin(), 1080 e = PD->classmeth_end(); i != e; ++i) { 1081 ObjCMethodDecl *MD = *i; 1082 llvm::Constant *C = GetMethodDescriptionConstant(MD); 1083 if (MD->getImplementationControl() == ObjCMethodDecl::Optional) { 1084 OptClassMethods.push_back(C); 1085 } else { 1086 ClassMethods.push_back(C); 1087 } 1088 } 1089 1090 std::vector<llvm::Constant*> Values(5); 1091 Values[0] = EmitProtocolExtension(PD, OptInstanceMethods, OptClassMethods); 1092 Values[1] = GetClassName(PD->getIdentifier()); 1093 Values[2] = 1094 EmitProtocolList("\01L_OBJC_PROTOCOL_REFS_" + PD->getNameAsString(), 1095 PD->protocol_begin(), 1096 PD->protocol_end()); 1097 Values[3] = 1098 EmitMethodDescList("\01L_OBJC_PROTOCOL_INSTANCE_METHODS_" 1099 + PD->getNameAsString(), 1100 "__OBJC,__cat_inst_meth,regular,no_dead_strip", 1101 InstanceMethods); 1102 Values[4] = 1103 EmitMethodDescList("\01L_OBJC_PROTOCOL_CLASS_METHODS_" 1104 + PD->getNameAsString(), 1105 "__OBJC,__cat_cls_meth,regular,no_dead_strip", 1106 ClassMethods); 1107 llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.ProtocolTy, 1108 Values); 1109 1110 if (Entry) { 1111 // Already created, fix the linkage and update the initializer. 1112 Entry->setLinkage(llvm::GlobalValue::InternalLinkage); 1113 Entry->setInitializer(Init); 1114 } else { 1115 Entry = 1116 new llvm::GlobalVariable(ObjCTypes.ProtocolTy, false, 1117 llvm::GlobalValue::InternalLinkage, 1118 Init, 1119 std::string("\01L_OBJC_PROTOCOL_")+ProtocolName, 1120 &CGM.getModule()); 1121 Entry->setSection("__OBJC,__protocol,regular,no_dead_strip"); 1122 Entry->setAlignment(4); 1123 UsedGlobals.push_back(Entry); 1124 // FIXME: Is this necessary? Why only for protocol? 1125 Entry->setAlignment(4); 1126 } 1127 1128 return Entry; 1129} 1130 1131llvm::Constant *CGObjCMac::GetOrEmitProtocolRef(const ObjCProtocolDecl *PD) { 1132 llvm::GlobalVariable *&Entry = Protocols[PD->getIdentifier()]; 1133 1134 if (!Entry) { 1135 // We use the initializer as a marker of whether this is a forward 1136 // reference or not. At module finalization we add the empty 1137 // contents for protocols which were referenced but never defined. 1138 Entry = 1139 new llvm::GlobalVariable(ObjCTypes.ProtocolTy, false, 1140 llvm::GlobalValue::ExternalLinkage, 1141 0, 1142 "\01L_OBJC_PROTOCOL_" + PD->getNameAsString(), 1143 &CGM.getModule()); 1144 Entry->setSection("__OBJC,__protocol,regular,no_dead_strip"); 1145 Entry->setAlignment(4); 1146 UsedGlobals.push_back(Entry); 1147 // FIXME: Is this necessary? Why only for protocol? 1148 Entry->setAlignment(4); 1149 } 1150 1151 return Entry; 1152} 1153 1154/* 1155 struct _objc_protocol_extension { 1156 uint32_t size; 1157 struct objc_method_description_list *optional_instance_methods; 1158 struct objc_method_description_list *optional_class_methods; 1159 struct objc_property_list *instance_properties; 1160 }; 1161*/ 1162llvm::Constant * 1163CGObjCMac::EmitProtocolExtension(const ObjCProtocolDecl *PD, 1164 const ConstantVector &OptInstanceMethods, 1165 const ConstantVector &OptClassMethods) { 1166 uint64_t Size = 1167 CGM.getTargetData().getTypePaddedSize(ObjCTypes.ProtocolExtensionTy); 1168 std::vector<llvm::Constant*> Values(4); 1169 Values[0] = llvm::ConstantInt::get(ObjCTypes.IntTy, Size); 1170 Values[1] = 1171 EmitMethodDescList("\01L_OBJC_PROTOCOL_INSTANCE_METHODS_OPT_" 1172 + PD->getNameAsString(), 1173 "__OBJC,__cat_inst_meth,regular,no_dead_strip", 1174 OptInstanceMethods); 1175 Values[2] = 1176 EmitMethodDescList("\01L_OBJC_PROTOCOL_CLASS_METHODS_OPT_" 1177 + PD->getNameAsString(), 1178 "__OBJC,__cat_cls_meth,regular,no_dead_strip", 1179 OptClassMethods); 1180 Values[3] = EmitPropertyList("\01L_OBJC_$_PROP_PROTO_LIST_" + 1181 PD->getNameAsString(), 1182 0, PD, ObjCTypes); 1183 1184 // Return null if no extension bits are used. 1185 if (Values[1]->isNullValue() && Values[2]->isNullValue() && 1186 Values[3]->isNullValue()) 1187 return llvm::Constant::getNullValue(ObjCTypes.ProtocolExtensionPtrTy); 1188 1189 llvm::Constant *Init = 1190 llvm::ConstantStruct::get(ObjCTypes.ProtocolExtensionTy, Values); 1191 1192 // No special section, but goes in llvm.used 1193 return CreateMetadataVar("\01L_OBJC_PROTOCOLEXT_" + PD->getNameAsString(), 1194 Init, 1195 0, 0, true); 1196} 1197 1198/* 1199 struct objc_protocol_list { 1200 struct objc_protocol_list *next; 1201 long count; 1202 Protocol *list[]; 1203 }; 1204*/ 1205llvm::Constant * 1206CGObjCMac::EmitProtocolList(const std::string &Name, 1207 ObjCProtocolDecl::protocol_iterator begin, 1208 ObjCProtocolDecl::protocol_iterator end) { 1209 std::vector<llvm::Constant*> ProtocolRefs; 1210 1211 for (; begin != end; ++begin) 1212 ProtocolRefs.push_back(GetProtocolRef(*begin)); 1213 1214 // Just return null for empty protocol lists 1215 if (ProtocolRefs.empty()) 1216 return llvm::Constant::getNullValue(ObjCTypes.ProtocolListPtrTy); 1217 1218 // This list is null terminated. 1219 ProtocolRefs.push_back(llvm::Constant::getNullValue(ObjCTypes.ProtocolPtrTy)); 1220 1221 std::vector<llvm::Constant*> Values(3); 1222 // This field is only used by the runtime. 1223 Values[0] = llvm::Constant::getNullValue(ObjCTypes.ProtocolListPtrTy); 1224 Values[1] = llvm::ConstantInt::get(ObjCTypes.LongTy, ProtocolRefs.size() - 1); 1225 Values[2] = 1226 llvm::ConstantArray::get(llvm::ArrayType::get(ObjCTypes.ProtocolPtrTy, 1227 ProtocolRefs.size()), 1228 ProtocolRefs); 1229 1230 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 1231 llvm::GlobalVariable *GV = 1232 CreateMetadataVar(Name, Init, "__OBJC,__cat_cls_meth,regular,no_dead_strip", 1233 4, false); 1234 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.ProtocolListPtrTy); 1235} 1236 1237/* 1238 struct _objc_property { 1239 const char * const name; 1240 const char * const attributes; 1241 }; 1242 1243 struct _objc_property_list { 1244 uint32_t entsize; // sizeof (struct _objc_property) 1245 uint32_t prop_count; 1246 struct _objc_property[prop_count]; 1247 }; 1248*/ 1249llvm::Constant *CGObjCCommonMac::EmitPropertyList(const std::string &Name, 1250 const Decl *Container, 1251 const ObjCContainerDecl *OCD, 1252 const ObjCCommonTypesHelper &ObjCTypes) { 1253 std::vector<llvm::Constant*> Properties, Prop(2); 1254 for (ObjCContainerDecl::prop_iterator I = OCD->prop_begin(), 1255 E = OCD->prop_end(); I != E; ++I) { 1256 const ObjCPropertyDecl *PD = *I; 1257 Prop[0] = GetPropertyName(PD->getIdentifier()); 1258 Prop[1] = GetPropertyTypeString(PD, Container); 1259 Properties.push_back(llvm::ConstantStruct::get(ObjCTypes.PropertyTy, 1260 Prop)); 1261 } 1262 1263 // Return null for empty list. 1264 if (Properties.empty()) 1265 return llvm::Constant::getNullValue(ObjCTypes.PropertyListPtrTy); 1266 1267 unsigned PropertySize = 1268 CGM.getTargetData().getTypePaddedSize(ObjCTypes.PropertyTy); 1269 std::vector<llvm::Constant*> Values(3); 1270 Values[0] = llvm::ConstantInt::get(ObjCTypes.IntTy, PropertySize); 1271 Values[1] = llvm::ConstantInt::get(ObjCTypes.IntTy, Properties.size()); 1272 llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.PropertyTy, 1273 Properties.size()); 1274 Values[2] = llvm::ConstantArray::get(AT, Properties); 1275 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 1276 1277 // No special section on property lists? 1278 llvm::GlobalVariable *GV = 1279 CreateMetadataVar(Name, Init, (ObjCABI == 2) ? "__DATA, __objc_const" : 0, 1280 0, true); 1281 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.PropertyListPtrTy); 1282} 1283 1284/* 1285 struct objc_method_description_list { 1286 int count; 1287 struct objc_method_description list[]; 1288 }; 1289*/ 1290llvm::Constant * 1291CGObjCMac::GetMethodDescriptionConstant(const ObjCMethodDecl *MD) { 1292 std::vector<llvm::Constant*> Desc(2); 1293 Desc[0] = llvm::ConstantExpr::getBitCast(GetMethodVarName(MD->getSelector()), 1294 ObjCTypes.SelectorPtrTy); 1295 Desc[1] = GetMethodVarType(MD); 1296 return llvm::ConstantStruct::get(ObjCTypes.MethodDescriptionTy, 1297 Desc); 1298} 1299 1300llvm::Constant *CGObjCMac::EmitMethodDescList(const std::string &Name, 1301 const char *Section, 1302 const ConstantVector &Methods) { 1303 // Return null for empty list. 1304 if (Methods.empty()) 1305 return llvm::Constant::getNullValue(ObjCTypes.MethodDescriptionListPtrTy); 1306 1307 std::vector<llvm::Constant*> Values(2); 1308 Values[0] = llvm::ConstantInt::get(ObjCTypes.IntTy, Methods.size()); 1309 llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.MethodDescriptionTy, 1310 Methods.size()); 1311 Values[1] = llvm::ConstantArray::get(AT, Methods); 1312 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 1313 1314 llvm::GlobalVariable *GV = CreateMetadataVar(Name, Init, Section, 0, true); 1315 return llvm::ConstantExpr::getBitCast(GV, 1316 ObjCTypes.MethodDescriptionListPtrTy); 1317} 1318 1319/* 1320 struct _objc_category { 1321 char *category_name; 1322 char *class_name; 1323 struct _objc_method_list *instance_methods; 1324 struct _objc_method_list *class_methods; 1325 struct _objc_protocol_list *protocols; 1326 uint32_t size; // <rdar://4585769> 1327 struct _objc_property_list *instance_properties; 1328 }; 1329 */ 1330void CGObjCMac::GenerateCategory(const ObjCCategoryImplDecl *OCD) { 1331 unsigned Size = CGM.getTargetData().getTypePaddedSize(ObjCTypes.CategoryTy); 1332 1333 // FIXME: This is poor design, the OCD should have a pointer to the 1334 // category decl. Additionally, note that Category can be null for 1335 // the @implementation w/o an @interface case. Sema should just 1336 // create one for us as it does for @implementation so everyone else 1337 // can live life under a clear blue sky. 1338 const ObjCInterfaceDecl *Interface = OCD->getClassInterface(); 1339 const ObjCCategoryDecl *Category = 1340 Interface->FindCategoryDeclaration(OCD->getIdentifier()); 1341 std::string ExtName(Interface->getNameAsString() + "_" + 1342 OCD->getNameAsString()); 1343 1344 std::vector<llvm::Constant*> InstanceMethods, ClassMethods; 1345 for (ObjCCategoryImplDecl::instmeth_iterator i = OCD->instmeth_begin(), 1346 e = OCD->instmeth_end(); i != e; ++i) { 1347 // Instance methods should always be defined. 1348 InstanceMethods.push_back(GetMethodConstant(*i)); 1349 } 1350 for (ObjCCategoryImplDecl::classmeth_iterator i = OCD->classmeth_begin(), 1351 e = OCD->classmeth_end(); i != e; ++i) { 1352 // Class methods should always be defined. 1353 ClassMethods.push_back(GetMethodConstant(*i)); 1354 } 1355 1356 std::vector<llvm::Constant*> Values(7); 1357 Values[0] = GetClassName(OCD->getIdentifier()); 1358 Values[1] = GetClassName(Interface->getIdentifier()); 1359 Values[2] = 1360 EmitMethodList(std::string("\01L_OBJC_CATEGORY_INSTANCE_METHODS_") + 1361 ExtName, 1362 "__OBJC,__cat_inst_meth,regular,no_dead_strip", 1363 InstanceMethods); 1364 Values[3] = 1365 EmitMethodList(std::string("\01L_OBJC_CATEGORY_CLASS_METHODS_") + ExtName, 1366 "__OBJC,__cat_class_meth,regular,no_dead_strip", 1367 ClassMethods); 1368 if (Category) { 1369 Values[4] = 1370 EmitProtocolList(std::string("\01L_OBJC_CATEGORY_PROTOCOLS_") + ExtName, 1371 Category->protocol_begin(), 1372 Category->protocol_end()); 1373 } else { 1374 Values[4] = llvm::Constant::getNullValue(ObjCTypes.ProtocolListPtrTy); 1375 } 1376 Values[5] = llvm::ConstantInt::get(ObjCTypes.IntTy, Size); 1377 1378 // If there is no category @interface then there can be no properties. 1379 if (Category) { 1380 Values[6] = EmitPropertyList(std::string("\01L_OBJC_$_PROP_LIST_") + ExtName, 1381 OCD, Category, ObjCTypes); 1382 } else { 1383 Values[6] = llvm::Constant::getNullValue(ObjCTypes.PropertyListPtrTy); 1384 } 1385 1386 llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.CategoryTy, 1387 Values); 1388 1389 llvm::GlobalVariable *GV = 1390 CreateMetadataVar(std::string("\01L_OBJC_CATEGORY_")+ExtName, Init, 1391 "__OBJC,__category,regular,no_dead_strip", 1392 4, true); 1393 DefinedCategories.push_back(GV); 1394} 1395 1396// FIXME: Get from somewhere? 1397enum ClassFlags { 1398 eClassFlags_Factory = 0x00001, 1399 eClassFlags_Meta = 0x00002, 1400 // <rdr://5142207> 1401 eClassFlags_HasCXXStructors = 0x02000, 1402 eClassFlags_Hidden = 0x20000, 1403 eClassFlags_ABI2_Hidden = 0x00010, 1404 eClassFlags_ABI2_HasCXXStructors = 0x00004 // <rdr://4923634> 1405}; 1406 1407// <rdr://5142207&4705298&4843145> 1408static bool IsClassHidden(const ObjCInterfaceDecl *ID) { 1409 if (const VisibilityAttr *attr = ID->getAttr<VisibilityAttr>()) { 1410 // FIXME: Support -fvisibility 1411 switch (attr->getVisibility()) { 1412 default: 1413 assert(0 && "Unknown visibility"); 1414 return false; 1415 case VisibilityAttr::DefaultVisibility: 1416 case VisibilityAttr::ProtectedVisibility: // FIXME: What do we do here? 1417 return false; 1418 case VisibilityAttr::HiddenVisibility: 1419 return true; 1420 } 1421 } else { 1422 return false; // FIXME: Support -fvisibility 1423 } 1424} 1425 1426/* 1427 struct _objc_class { 1428 Class isa; 1429 Class super_class; 1430 const char *name; 1431 long version; 1432 long info; 1433 long instance_size; 1434 struct _objc_ivar_list *ivars; 1435 struct _objc_method_list *methods; 1436 struct _objc_cache *cache; 1437 struct _objc_protocol_list *protocols; 1438 // Objective-C 1.0 extensions (<rdr://4585769>) 1439 const char *ivar_layout; 1440 struct _objc_class_ext *ext; 1441 }; 1442 1443 See EmitClassExtension(); 1444 */ 1445void CGObjCMac::GenerateClass(const ObjCImplementationDecl *ID) { 1446 DefinedSymbols.insert(ID->getIdentifier()); 1447 1448 std::string ClassName = ID->getNameAsString(); 1449 // FIXME: Gross 1450 ObjCInterfaceDecl *Interface = 1451 const_cast<ObjCInterfaceDecl*>(ID->getClassInterface()); 1452 llvm::Constant *Protocols = 1453 EmitProtocolList("\01L_OBJC_CLASS_PROTOCOLS_" + ID->getNameAsString(), 1454 Interface->protocol_begin(), 1455 Interface->protocol_end()); 1456 const llvm::Type *InterfaceTy = 1457 CGM.getTypes().ConvertType(CGM.getContext().buildObjCInterfaceType(Interface)); 1458 unsigned Flags = eClassFlags_Factory; 1459 unsigned Size = CGM.getTargetData().getTypePaddedSize(InterfaceTy); 1460 1461 // FIXME: Set CXX-structors flag. 1462 if (IsClassHidden(ID->getClassInterface())) 1463 Flags |= eClassFlags_Hidden; 1464 1465 std::vector<llvm::Constant*> InstanceMethods, ClassMethods; 1466 for (ObjCImplementationDecl::instmeth_iterator i = ID->instmeth_begin(), 1467 e = ID->instmeth_end(); i != e; ++i) { 1468 // Instance methods should always be defined. 1469 InstanceMethods.push_back(GetMethodConstant(*i)); 1470 } 1471 for (ObjCImplementationDecl::classmeth_iterator i = ID->classmeth_begin(), 1472 e = ID->classmeth_end(); i != e; ++i) { 1473 // Class methods should always be defined. 1474 ClassMethods.push_back(GetMethodConstant(*i)); 1475 } 1476 1477 for (ObjCImplementationDecl::propimpl_iterator i = ID->propimpl_begin(), 1478 e = ID->propimpl_end(); i != e; ++i) { 1479 ObjCPropertyImplDecl *PID = *i; 1480 1481 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) { 1482 ObjCPropertyDecl *PD = PID->getPropertyDecl(); 1483 1484 if (ObjCMethodDecl *MD = PD->getGetterMethodDecl()) 1485 if (llvm::Constant *C = GetMethodConstant(MD)) 1486 InstanceMethods.push_back(C); 1487 if (ObjCMethodDecl *MD = PD->getSetterMethodDecl()) 1488 if (llvm::Constant *C = GetMethodConstant(MD)) 1489 InstanceMethods.push_back(C); 1490 } 1491 } 1492 1493 std::vector<llvm::Constant*> Values(12); 1494 Values[ 0] = EmitMetaClass(ID, Protocols, InterfaceTy, ClassMethods); 1495 if (ObjCInterfaceDecl *Super = Interface->getSuperClass()) { 1496 // Record a reference to the super class. 1497 LazySymbols.insert(Super->getIdentifier()); 1498 1499 Values[ 1] = 1500 llvm::ConstantExpr::getBitCast(GetClassName(Super->getIdentifier()), 1501 ObjCTypes.ClassPtrTy); 1502 } else { 1503 Values[ 1] = llvm::Constant::getNullValue(ObjCTypes.ClassPtrTy); 1504 } 1505 Values[ 2] = GetClassName(ID->getIdentifier()); 1506 // Version is always 0. 1507 Values[ 3] = llvm::ConstantInt::get(ObjCTypes.LongTy, 0); 1508 Values[ 4] = llvm::ConstantInt::get(ObjCTypes.LongTy, Flags); 1509 Values[ 5] = llvm::ConstantInt::get(ObjCTypes.LongTy, Size); 1510 Values[ 6] = EmitIvarList(ID, false); 1511 Values[ 7] = 1512 EmitMethodList("\01L_OBJC_INSTANCE_METHODS_" + ID->getNameAsString(), 1513 "__OBJC,__inst_meth,regular,no_dead_strip", 1514 InstanceMethods); 1515 // cache is always NULL. 1516 Values[ 8] = llvm::Constant::getNullValue(ObjCTypes.CachePtrTy); 1517 Values[ 9] = Protocols; 1518 // FIXME: Set ivar_layout 1519 // Values[10] = BuildIvarLayout(ID, true); 1520 Values[10] = GetIvarLayoutName(0, ObjCTypes); 1521 Values[11] = EmitClassExtension(ID); 1522 llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.ClassTy, 1523 Values); 1524 1525 llvm::GlobalVariable *GV = 1526 CreateMetadataVar(std::string("\01L_OBJC_CLASS_")+ClassName, Init, 1527 "__OBJC,__class,regular,no_dead_strip", 1528 4, true); 1529 DefinedClasses.push_back(GV); 1530} 1531 1532llvm::Constant *CGObjCMac::EmitMetaClass(const ObjCImplementationDecl *ID, 1533 llvm::Constant *Protocols, 1534 const llvm::Type *InterfaceTy, 1535 const ConstantVector &Methods) { 1536 unsigned Flags = eClassFlags_Meta; 1537 unsigned Size = CGM.getTargetData().getTypePaddedSize(ObjCTypes.ClassTy); 1538 1539 if (IsClassHidden(ID->getClassInterface())) 1540 Flags |= eClassFlags_Hidden; 1541 1542 std::vector<llvm::Constant*> Values(12); 1543 // The isa for the metaclass is the root of the hierarchy. 1544 const ObjCInterfaceDecl *Root = ID->getClassInterface(); 1545 while (const ObjCInterfaceDecl *Super = Root->getSuperClass()) 1546 Root = Super; 1547 Values[ 0] = 1548 llvm::ConstantExpr::getBitCast(GetClassName(Root->getIdentifier()), 1549 ObjCTypes.ClassPtrTy); 1550 // The super class for the metaclass is emitted as the name of the 1551 // super class. The runtime fixes this up to point to the 1552 // *metaclass* for the super class. 1553 if (ObjCInterfaceDecl *Super = ID->getClassInterface()->getSuperClass()) { 1554 Values[ 1] = 1555 llvm::ConstantExpr::getBitCast(GetClassName(Super->getIdentifier()), 1556 ObjCTypes.ClassPtrTy); 1557 } else { 1558 Values[ 1] = llvm::Constant::getNullValue(ObjCTypes.ClassPtrTy); 1559 } 1560 Values[ 2] = GetClassName(ID->getIdentifier()); 1561 // Version is always 0. 1562 Values[ 3] = llvm::ConstantInt::get(ObjCTypes.LongTy, 0); 1563 Values[ 4] = llvm::ConstantInt::get(ObjCTypes.LongTy, Flags); 1564 Values[ 5] = llvm::ConstantInt::get(ObjCTypes.LongTy, Size); 1565 Values[ 6] = EmitIvarList(ID, true); 1566 Values[ 7] = 1567 EmitMethodList("\01L_OBJC_CLASS_METHODS_" + ID->getNameAsString(), 1568 "__OBJC,__inst_meth,regular,no_dead_strip", 1569 Methods); 1570 // cache is always NULL. 1571 Values[ 8] = llvm::Constant::getNullValue(ObjCTypes.CachePtrTy); 1572 Values[ 9] = Protocols; 1573 // ivar_layout for metaclass is always NULL. 1574 Values[10] = llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy); 1575 // The class extension is always unused for metaclasses. 1576 Values[11] = llvm::Constant::getNullValue(ObjCTypes.ClassExtensionPtrTy); 1577 llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.ClassTy, 1578 Values); 1579 1580 std::string Name("\01L_OBJC_METACLASS_"); 1581 Name += ID->getNameAsCString(); 1582 1583 // Check for a forward reference. 1584 llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name); 1585 if (GV) { 1586 assert(GV->getType()->getElementType() == ObjCTypes.ClassTy && 1587 "Forward metaclass reference has incorrect type."); 1588 GV->setLinkage(llvm::GlobalValue::InternalLinkage); 1589 GV->setInitializer(Init); 1590 } else { 1591 GV = new llvm::GlobalVariable(ObjCTypes.ClassTy, false, 1592 llvm::GlobalValue::InternalLinkage, 1593 Init, Name, 1594 &CGM.getModule()); 1595 } 1596 GV->setSection("__OBJC,__meta_class,regular,no_dead_strip"); 1597 GV->setAlignment(4); 1598 UsedGlobals.push_back(GV); 1599 1600 return GV; 1601} 1602 1603llvm::Constant *CGObjCMac::EmitMetaClassRef(const ObjCInterfaceDecl *ID) { 1604 std::string Name = "\01L_OBJC_METACLASS_" + ID->getNameAsString(); 1605 1606 // FIXME: Should we look these up somewhere other than the 1607 // module. Its a bit silly since we only generate these while 1608 // processing an implementation, so exactly one pointer would work 1609 // if know when we entered/exitted an implementation block. 1610 1611 // Check for an existing forward reference. 1612 // Previously, metaclass with internal linkage may have been defined. 1613 // pass 'true' as 2nd argument so it is returned. 1614 if (llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name, true)) { 1615 assert(GV->getType()->getElementType() == ObjCTypes.ClassTy && 1616 "Forward metaclass reference has incorrect type."); 1617 return GV; 1618 } else { 1619 // Generate as an external reference to keep a consistent 1620 // module. This will be patched up when we emit the metaclass. 1621 return new llvm::GlobalVariable(ObjCTypes.ClassTy, false, 1622 llvm::GlobalValue::ExternalLinkage, 1623 0, 1624 Name, 1625 &CGM.getModule()); 1626 } 1627} 1628 1629/* 1630 struct objc_class_ext { 1631 uint32_t size; 1632 const char *weak_ivar_layout; 1633 struct _objc_property_list *properties; 1634 }; 1635*/ 1636llvm::Constant * 1637CGObjCMac::EmitClassExtension(const ObjCImplementationDecl *ID) { 1638 uint64_t Size = 1639 CGM.getTargetData().getTypePaddedSize(ObjCTypes.ClassExtensionTy); 1640 1641 std::vector<llvm::Constant*> Values(3); 1642 Values[0] = llvm::ConstantInt::get(ObjCTypes.IntTy, Size); 1643 // FIXME: Output weak_ivar_layout string. 1644 // Values[1] = BuildIvarLayout(ID, false); 1645 Values[1] = GetIvarLayoutName(0, ObjCTypes); 1646 Values[2] = EmitPropertyList("\01L_OBJC_$_PROP_LIST_" + ID->getNameAsString(), 1647 ID, ID->getClassInterface(), ObjCTypes); 1648 1649 // Return null if no extension bits are used. 1650 if (Values[1]->isNullValue() && Values[2]->isNullValue()) 1651 return llvm::Constant::getNullValue(ObjCTypes.ClassExtensionPtrTy); 1652 1653 llvm::Constant *Init = 1654 llvm::ConstantStruct::get(ObjCTypes.ClassExtensionTy, Values); 1655 return CreateMetadataVar("\01L_OBJC_CLASSEXT_" + ID->getNameAsString(), 1656 Init, 0, 0, true); 1657} 1658 1659/// countInheritedIvars - count number of ivars in class and its super class(s) 1660/// 1661static int countInheritedIvars(const ObjCInterfaceDecl *OI) { 1662 int count = 0; 1663 if (!OI) 1664 return 0; 1665 const ObjCInterfaceDecl *SuperClass = OI->getSuperClass(); 1666 if (SuperClass) 1667 count += countInheritedIvars(SuperClass); 1668 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 1669 E = OI->ivar_end(); I != E; ++I) 1670 ++count; 1671 return count; 1672} 1673 1674/// getInterfaceDeclForIvar - Get the interface declaration node where 1675/// this ivar is declared in. 1676/// FIXME. Ideally, this info should be in the ivar node. But currently 1677/// it is not and prevailing wisdom is that ASTs should not have more 1678/// info than is absolutely needed, even though this info reflects the 1679/// source language. 1680/// 1681static const ObjCInterfaceDecl *getInterfaceDeclForIvar( 1682 const ObjCInterfaceDecl *OI, 1683 const ObjCIvarDecl *IVD) { 1684 if (!OI) 1685 return 0; 1686 assert(isa<ObjCInterfaceDecl>(OI) && "OI is not an interface"); 1687 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 1688 E = OI->ivar_end(); I != E; ++I) 1689 if ((*I)->getIdentifier() == IVD->getIdentifier()) 1690 return OI; 1691 return getInterfaceDeclForIvar(OI->getSuperClass(), IVD); 1692} 1693 1694/* 1695 struct objc_ivar { 1696 char *ivar_name; 1697 char *ivar_type; 1698 int ivar_offset; 1699 }; 1700 1701 struct objc_ivar_list { 1702 int ivar_count; 1703 struct objc_ivar list[count]; 1704 }; 1705 */ 1706llvm::Constant *CGObjCMac::EmitIvarList(const ObjCImplementationDecl *ID, 1707 bool ForClass) { 1708 std::vector<llvm::Constant*> Ivars, Ivar(3); 1709 1710 // When emitting the root class GCC emits ivar entries for the 1711 // actual class structure. It is not clear if we need to follow this 1712 // behavior; for now lets try and get away with not doing it. If so, 1713 // the cleanest solution would be to make up an ObjCInterfaceDecl 1714 // for the class. 1715 if (ForClass) 1716 return llvm::Constant::getNullValue(ObjCTypes.IvarListPtrTy); 1717 1718 ObjCInterfaceDecl *OID = 1719 const_cast<ObjCInterfaceDecl*>(ID->getClassInterface()); 1720 const llvm::StructLayout *Layout = GetInterfaceDeclStructLayout(OID); 1721 1722 RecordDecl::field_iterator ifield, pfield; 1723 const RecordDecl *RD = GetFirstIvarInRecord(OID, ifield, pfield); 1724 for (RecordDecl::field_iterator e = RD->field_end(); ifield != e; ++ifield) { 1725 FieldDecl *Field = *ifield; 1726 uint64_t Offset = GetIvarBaseOffset(Layout, Field); 1727 if (Field->getIdentifier()) 1728 Ivar[0] = GetMethodVarName(Field->getIdentifier()); 1729 else 1730 Ivar[0] = llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy); 1731 Ivar[1] = GetMethodVarType(Field); 1732 Ivar[2] = llvm::ConstantInt::get(ObjCTypes.IntTy, Offset); 1733 Ivars.push_back(llvm::ConstantStruct::get(ObjCTypes.IvarTy, Ivar)); 1734 } 1735 1736 // Return null for empty list. 1737 if (Ivars.empty()) 1738 return llvm::Constant::getNullValue(ObjCTypes.IvarListPtrTy); 1739 1740 std::vector<llvm::Constant*> Values(2); 1741 Values[0] = llvm::ConstantInt::get(ObjCTypes.IntTy, Ivars.size()); 1742 llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.IvarTy, 1743 Ivars.size()); 1744 Values[1] = llvm::ConstantArray::get(AT, Ivars); 1745 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 1746 1747 llvm::GlobalVariable *GV; 1748 if (ForClass) 1749 GV = CreateMetadataVar("\01L_OBJC_CLASS_VARIABLES_" + ID->getNameAsString(), 1750 Init, "__OBJC,__class_vars,regular,no_dead_strip", 1751 4, true); 1752 else 1753 GV = CreateMetadataVar("\01L_OBJC_INSTANCE_VARIABLES_" 1754 + ID->getNameAsString(), 1755 Init, "__OBJC,__instance_vars,regular,no_dead_strip", 1756 0, true); 1757 return llvm::ConstantExpr::getBitCast(GV, 1758 ObjCTypes.IvarListPtrTy); 1759} 1760 1761/* 1762 struct objc_method { 1763 SEL method_name; 1764 char *method_types; 1765 void *method; 1766 }; 1767 1768 struct objc_method_list { 1769 struct objc_method_list *obsolete; 1770 int count; 1771 struct objc_method methods_list[count]; 1772 }; 1773*/ 1774 1775/// GetMethodConstant - Return a struct objc_method constant for the 1776/// given method if it has been defined. The result is null if the 1777/// method has not been defined. The return value has type MethodPtrTy. 1778llvm::Constant *CGObjCMac::GetMethodConstant(const ObjCMethodDecl *MD) { 1779 // FIXME: Use DenseMap::lookup 1780 llvm::Function *Fn = MethodDefinitions[MD]; 1781 if (!Fn) 1782 return 0; 1783 1784 std::vector<llvm::Constant*> Method(3); 1785 Method[0] = 1786 llvm::ConstantExpr::getBitCast(GetMethodVarName(MD->getSelector()), 1787 ObjCTypes.SelectorPtrTy); 1788 Method[1] = GetMethodVarType(MD); 1789 Method[2] = llvm::ConstantExpr::getBitCast(Fn, ObjCTypes.Int8PtrTy); 1790 return llvm::ConstantStruct::get(ObjCTypes.MethodTy, Method); 1791} 1792 1793llvm::Constant *CGObjCMac::EmitMethodList(const std::string &Name, 1794 const char *Section, 1795 const ConstantVector &Methods) { 1796 // Return null for empty list. 1797 if (Methods.empty()) 1798 return llvm::Constant::getNullValue(ObjCTypes.MethodListPtrTy); 1799 1800 std::vector<llvm::Constant*> Values(3); 1801 Values[0] = llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy); 1802 Values[1] = llvm::ConstantInt::get(ObjCTypes.IntTy, Methods.size()); 1803 llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.MethodTy, 1804 Methods.size()); 1805 Values[2] = llvm::ConstantArray::get(AT, Methods); 1806 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 1807 1808 llvm::GlobalVariable *GV = CreateMetadataVar(Name, Init, Section, 0, true); 1809 return llvm::ConstantExpr::getBitCast(GV, 1810 ObjCTypes.MethodListPtrTy); 1811} 1812 1813llvm::Function *CGObjCCommonMac::GenerateMethod(const ObjCMethodDecl *OMD, 1814 const ObjCContainerDecl *CD) { 1815 std::string Name; 1816 GetNameForMethod(OMD, CD, Name); 1817 1818 CodeGenTypes &Types = CGM.getTypes(); 1819 const llvm::FunctionType *MethodTy = 1820 Types.GetFunctionType(Types.getFunctionInfo(OMD), OMD->isVariadic()); 1821 llvm::Function *Method = 1822 llvm::Function::Create(MethodTy, 1823 llvm::GlobalValue::InternalLinkage, 1824 Name, 1825 &CGM.getModule()); 1826 MethodDefinitions.insert(std::make_pair(OMD, Method)); 1827 1828 return Method; 1829} 1830 1831uint64_t CGObjCCommonMac::GetIvarBaseOffset(const llvm::StructLayout *Layout, 1832 const FieldDecl *Field) { 1833 if (!Field->isBitField()) 1834 return Layout->getElementOffset( 1835 CGM.getTypes().getLLVMFieldNo(Field)); 1836 // FIXME. Must be a better way of getting a bitfield base offset. 1837 uint64_t offset = CGM.getTypes().getLLVMFieldNo(Field); 1838 const llvm::Type *Ty = CGM.getTypes().ConvertTypeForMemRecursive(Field->getType()); 1839 uint64_t size = CGM.getTypes().getTargetData().getTypePaddedSizeInBits(Ty); 1840 offset = (offset*size)/8; 1841 return offset; 1842} 1843 1844/// GetFieldBaseOffset - return's field byt offset. 1845uint64_t CGObjCCommonMac::GetFieldBaseOffset(const ObjCInterfaceDecl *OI, 1846 const llvm::StructLayout *Layout, 1847 const FieldDecl *Field) { 1848 const ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(Field); 1849 const FieldDecl *FD = OI->lookupFieldDeclForIvar(CGM.getContext(), Ivar); 1850 return GetIvarBaseOffset(Layout, FD); 1851} 1852 1853llvm::GlobalVariable * 1854CGObjCCommonMac::CreateMetadataVar(const std::string &Name, 1855 llvm::Constant *Init, 1856 const char *Section, 1857 unsigned Align, 1858 bool AddToUsed) { 1859 const llvm::Type *Ty = Init->getType(); 1860 llvm::GlobalVariable *GV = 1861 new llvm::GlobalVariable(Ty, false, 1862 llvm::GlobalValue::InternalLinkage, 1863 Init, 1864 Name, 1865 &CGM.getModule()); 1866 if (Section) 1867 GV->setSection(Section); 1868 if (Align) 1869 GV->setAlignment(Align); 1870 if (AddToUsed) 1871 UsedGlobals.push_back(GV); 1872 return GV; 1873} 1874 1875llvm::Function *CGObjCMac::ModuleInitFunction() { 1876 // Abuse this interface function as a place to finalize. 1877 FinishModule(); 1878 1879 return NULL; 1880} 1881 1882llvm::Constant *CGObjCMac::GetPropertyGetFunction() { 1883 return ObjCTypes.GetPropertyFn; 1884} 1885 1886llvm::Constant *CGObjCMac::GetPropertySetFunction() { 1887 return ObjCTypes.SetPropertyFn; 1888} 1889 1890llvm::Constant *CGObjCMac::EnumerationMutationFunction() { 1891 return ObjCTypes.EnumerationMutationFn; 1892} 1893 1894/* 1895 1896Objective-C setjmp-longjmp (sjlj) Exception Handling 1897-- 1898 1899The basic framework for a @try-catch-finally is as follows: 1900{ 1901 objc_exception_data d; 1902 id _rethrow = null; 1903 bool _call_try_exit = true; 1904 1905 objc_exception_try_enter(&d); 1906 if (!setjmp(d.jmp_buf)) { 1907 ... try body ... 1908 } else { 1909 // exception path 1910 id _caught = objc_exception_extract(&d); 1911 1912 // enter new try scope for handlers 1913 if (!setjmp(d.jmp_buf)) { 1914 ... match exception and execute catch blocks ... 1915 1916 // fell off end, rethrow. 1917 _rethrow = _caught; 1918 ... jump-through-finally to finally_rethrow ... 1919 } else { 1920 // exception in catch block 1921 _rethrow = objc_exception_extract(&d); 1922 _call_try_exit = false; 1923 ... jump-through-finally to finally_rethrow ... 1924 } 1925 } 1926 ... jump-through-finally to finally_end ... 1927 1928finally: 1929 if (_call_try_exit) 1930 objc_exception_try_exit(&d); 1931 1932 ... finally block .... 1933 ... dispatch to finally destination ... 1934 1935finally_rethrow: 1936 objc_exception_throw(_rethrow); 1937 1938finally_end: 1939} 1940 1941This framework differs slightly from the one gcc uses, in that gcc 1942uses _rethrow to determine if objc_exception_try_exit should be called 1943and if the object should be rethrown. This breaks in the face of 1944throwing nil and introduces unnecessary branches. 1945 1946We specialize this framework for a few particular circumstances: 1947 1948 - If there are no catch blocks, then we avoid emitting the second 1949 exception handling context. 1950 1951 - If there is a catch-all catch block (i.e. @catch(...) or @catch(id 1952 e)) we avoid emitting the code to rethrow an uncaught exception. 1953 1954 - FIXME: If there is no @finally block we can do a few more 1955 simplifications. 1956 1957Rethrows and Jumps-Through-Finally 1958-- 1959 1960Support for implicit rethrows and jumping through the finally block is 1961handled by storing the current exception-handling context in 1962ObjCEHStack. 1963 1964In order to implement proper @finally semantics, we support one basic 1965mechanism for jumping through the finally block to an arbitrary 1966destination. Constructs which generate exits from a @try or @catch 1967block use this mechanism to implement the proper semantics by chaining 1968jumps, as necessary. 1969 1970This mechanism works like the one used for indirect goto: we 1971arbitrarily assign an ID to each destination and store the ID for the 1972destination in a variable prior to entering the finally block. At the 1973end of the finally block we simply create a switch to the proper 1974destination. 1975 1976Code gen for @synchronized(expr) stmt; 1977Effectively generating code for: 1978objc_sync_enter(expr); 1979@try stmt @finally { objc_sync_exit(expr); } 1980*/ 1981 1982void CGObjCMac::EmitTryOrSynchronizedStmt(CodeGen::CodeGenFunction &CGF, 1983 const Stmt &S) { 1984 bool isTry = isa<ObjCAtTryStmt>(S); 1985 // Create various blocks we refer to for handling @finally. 1986 llvm::BasicBlock *FinallyBlock = CGF.createBasicBlock("finally"); 1987 llvm::BasicBlock *FinallyExit = CGF.createBasicBlock("finally.exit"); 1988 llvm::BasicBlock *FinallyNoExit = CGF.createBasicBlock("finally.noexit"); 1989 llvm::BasicBlock *FinallyRethrow = CGF.createBasicBlock("finally.throw"); 1990 llvm::BasicBlock *FinallyEnd = CGF.createBasicBlock("finally.end"); 1991 1992 // For @synchronized, call objc_sync_enter(sync.expr). The 1993 // evaluation of the expression must occur before we enter the 1994 // @synchronized. We can safely avoid a temp here because jumps into 1995 // @synchronized are illegal & this will dominate uses. 1996 llvm::Value *SyncArg = 0; 1997 if (!isTry) { 1998 SyncArg = 1999 CGF.EmitScalarExpr(cast<ObjCAtSynchronizedStmt>(S).getSynchExpr()); 2000 SyncArg = CGF.Builder.CreateBitCast(SyncArg, ObjCTypes.ObjectPtrTy); 2001 CGF.Builder.CreateCall(ObjCTypes.SyncEnterFn, SyncArg); 2002 } 2003 2004 // Push an EH context entry, used for handling rethrows and jumps 2005 // through finally. 2006 CGF.PushCleanupBlock(FinallyBlock); 2007 2008 CGF.ObjCEHValueStack.push_back(0); 2009 2010 // Allocate memory for the exception data and rethrow pointer. 2011 llvm::Value *ExceptionData = CGF.CreateTempAlloca(ObjCTypes.ExceptionDataTy, 2012 "exceptiondata.ptr"); 2013 llvm::Value *RethrowPtr = CGF.CreateTempAlloca(ObjCTypes.ObjectPtrTy, 2014 "_rethrow"); 2015 llvm::Value *CallTryExitPtr = CGF.CreateTempAlloca(llvm::Type::Int1Ty, 2016 "_call_try_exit"); 2017 CGF.Builder.CreateStore(llvm::ConstantInt::getTrue(), CallTryExitPtr); 2018 2019 // Enter a new try block and call setjmp. 2020 CGF.Builder.CreateCall(ObjCTypes.ExceptionTryEnterFn, ExceptionData); 2021 llvm::Value *JmpBufPtr = CGF.Builder.CreateStructGEP(ExceptionData, 0, 2022 "jmpbufarray"); 2023 JmpBufPtr = CGF.Builder.CreateStructGEP(JmpBufPtr, 0, "tmp"); 2024 llvm::Value *SetJmpResult = CGF.Builder.CreateCall(ObjCTypes.SetJmpFn, 2025 JmpBufPtr, "result"); 2026 2027 llvm::BasicBlock *TryBlock = CGF.createBasicBlock("try"); 2028 llvm::BasicBlock *TryHandler = CGF.createBasicBlock("try.handler"); 2029 CGF.Builder.CreateCondBr(CGF.Builder.CreateIsNotNull(SetJmpResult, "threw"), 2030 TryHandler, TryBlock); 2031 2032 // Emit the @try block. 2033 CGF.EmitBlock(TryBlock); 2034 CGF.EmitStmt(isTry ? cast<ObjCAtTryStmt>(S).getTryBody() 2035 : cast<ObjCAtSynchronizedStmt>(S).getSynchBody()); 2036 CGF.EmitBranchThroughCleanup(FinallyEnd); 2037 2038 // Emit the "exception in @try" block. 2039 CGF.EmitBlock(TryHandler); 2040 2041 // Retrieve the exception object. We may emit multiple blocks but 2042 // nothing can cross this so the value is already in SSA form. 2043 llvm::Value *Caught = CGF.Builder.CreateCall(ObjCTypes.ExceptionExtractFn, 2044 ExceptionData, 2045 "caught"); 2046 CGF.ObjCEHValueStack.back() = Caught; 2047 if (!isTry) 2048 { 2049 CGF.Builder.CreateStore(Caught, RethrowPtr); 2050 CGF.Builder.CreateStore(llvm::ConstantInt::getFalse(), CallTryExitPtr); 2051 CGF.EmitBranchThroughCleanup(FinallyRethrow); 2052 } 2053 else if (const ObjCAtCatchStmt* CatchStmt = 2054 cast<ObjCAtTryStmt>(S).getCatchStmts()) 2055 { 2056 // Enter a new exception try block (in case a @catch block throws 2057 // an exception). 2058 CGF.Builder.CreateCall(ObjCTypes.ExceptionTryEnterFn, ExceptionData); 2059 2060 llvm::Value *SetJmpResult = CGF.Builder.CreateCall(ObjCTypes.SetJmpFn, 2061 JmpBufPtr, "result"); 2062 llvm::Value *Threw = CGF.Builder.CreateIsNotNull(SetJmpResult, "threw"); 2063 2064 llvm::BasicBlock *CatchBlock = CGF.createBasicBlock("catch"); 2065 llvm::BasicBlock *CatchHandler = CGF.createBasicBlock("catch.handler"); 2066 CGF.Builder.CreateCondBr(Threw, CatchHandler, CatchBlock); 2067 2068 CGF.EmitBlock(CatchBlock); 2069 2070 // Handle catch list. As a special case we check if everything is 2071 // matched and avoid generating code for falling off the end if 2072 // so. 2073 bool AllMatched = false; 2074 for (; CatchStmt; CatchStmt = CatchStmt->getNextCatchStmt()) { 2075 llvm::BasicBlock *NextCatchBlock = CGF.createBasicBlock("catch"); 2076 2077 const ParmVarDecl *CatchParam = CatchStmt->getCatchParamDecl(); 2078 const PointerType *PT = 0; 2079 2080 // catch(...) always matches. 2081 if (!CatchParam) { 2082 AllMatched = true; 2083 } else { 2084 PT = CatchParam->getType()->getAsPointerType(); 2085 2086 // catch(id e) always matches. 2087 // FIXME: For the time being we also match id<X>; this should 2088 // be rejected by Sema instead. 2089 if ((PT && CGF.getContext().isObjCIdStructType(PT->getPointeeType())) || 2090 CatchParam->getType()->isObjCQualifiedIdType()) 2091 AllMatched = true; 2092 } 2093 2094 if (AllMatched) { 2095 if (CatchParam) { 2096 CGF.EmitLocalBlockVarDecl(*CatchParam); 2097 assert(CGF.HaveInsertPoint() && "DeclStmt destroyed insert point?"); 2098 CGF.Builder.CreateStore(Caught, CGF.GetAddrOfLocalVar(CatchParam)); 2099 } 2100 2101 CGF.EmitStmt(CatchStmt->getCatchBody()); 2102 CGF.EmitBranchThroughCleanup(FinallyEnd); 2103 break; 2104 } 2105 2106 assert(PT && "Unexpected non-pointer type in @catch"); 2107 QualType T = PT->getPointeeType(); 2108 const ObjCInterfaceType *ObjCType = T->getAsObjCInterfaceType(); 2109 assert(ObjCType && "Catch parameter must have Objective-C type!"); 2110 2111 // Check if the @catch block matches the exception object. 2112 llvm::Value *Class = EmitClassRef(CGF.Builder, ObjCType->getDecl()); 2113 2114 llvm::Value *Match = CGF.Builder.CreateCall2(ObjCTypes.ExceptionMatchFn, 2115 Class, Caught, "match"); 2116 2117 llvm::BasicBlock *MatchedBlock = CGF.createBasicBlock("matched"); 2118 2119 CGF.Builder.CreateCondBr(CGF.Builder.CreateIsNotNull(Match, "matched"), 2120 MatchedBlock, NextCatchBlock); 2121 2122 // Emit the @catch block. 2123 CGF.EmitBlock(MatchedBlock); 2124 CGF.EmitLocalBlockVarDecl(*CatchParam); 2125 assert(CGF.HaveInsertPoint() && "DeclStmt destroyed insert point?"); 2126 2127 llvm::Value *Tmp = 2128 CGF.Builder.CreateBitCast(Caught, CGF.ConvertType(CatchParam->getType()), 2129 "tmp"); 2130 CGF.Builder.CreateStore(Tmp, CGF.GetAddrOfLocalVar(CatchParam)); 2131 2132 CGF.EmitStmt(CatchStmt->getCatchBody()); 2133 CGF.EmitBranchThroughCleanup(FinallyEnd); 2134 2135 CGF.EmitBlock(NextCatchBlock); 2136 } 2137 2138 if (!AllMatched) { 2139 // None of the handlers caught the exception, so store it to be 2140 // rethrown at the end of the @finally block. 2141 CGF.Builder.CreateStore(Caught, RethrowPtr); 2142 CGF.EmitBranchThroughCleanup(FinallyRethrow); 2143 } 2144 2145 // Emit the exception handler for the @catch blocks. 2146 CGF.EmitBlock(CatchHandler); 2147 CGF.Builder.CreateStore(CGF.Builder.CreateCall(ObjCTypes.ExceptionExtractFn, 2148 ExceptionData), 2149 RethrowPtr); 2150 CGF.Builder.CreateStore(llvm::ConstantInt::getFalse(), CallTryExitPtr); 2151 CGF.EmitBranchThroughCleanup(FinallyRethrow); 2152 } else { 2153 CGF.Builder.CreateStore(Caught, RethrowPtr); 2154 CGF.Builder.CreateStore(llvm::ConstantInt::getFalse(), CallTryExitPtr); 2155 CGF.EmitBranchThroughCleanup(FinallyRethrow); 2156 } 2157 2158 // Pop the exception-handling stack entry. It is important to do 2159 // this now, because the code in the @finally block is not in this 2160 // context. 2161 CodeGenFunction::CleanupBlockInfo Info = CGF.PopCleanupBlock(); 2162 2163 CGF.ObjCEHValueStack.pop_back(); 2164 2165 // Emit the @finally block. 2166 CGF.EmitBlock(FinallyBlock); 2167 llvm::Value* CallTryExit = CGF.Builder.CreateLoad(CallTryExitPtr, "tmp"); 2168 2169 CGF.Builder.CreateCondBr(CallTryExit, FinallyExit, FinallyNoExit); 2170 2171 CGF.EmitBlock(FinallyExit); 2172 CGF.Builder.CreateCall(ObjCTypes.ExceptionTryExitFn, ExceptionData); 2173 2174 CGF.EmitBlock(FinallyNoExit); 2175 if (isTry) { 2176 if (const ObjCAtFinallyStmt* FinallyStmt = 2177 cast<ObjCAtTryStmt>(S).getFinallyStmt()) 2178 CGF.EmitStmt(FinallyStmt->getFinallyBody()); 2179 } else { 2180 // Emit objc_sync_exit(expr); as finally's sole statement for 2181 // @synchronized. 2182 CGF.Builder.CreateCall(ObjCTypes.SyncExitFn, SyncArg); 2183 } 2184 2185 // Emit the switch block 2186 if (Info.SwitchBlock) 2187 CGF.EmitBlock(Info.SwitchBlock); 2188 if (Info.EndBlock) 2189 CGF.EmitBlock(Info.EndBlock); 2190 2191 CGF.EmitBlock(FinallyRethrow); 2192 CGF.Builder.CreateCall(ObjCTypes.ExceptionThrowFn, 2193 CGF.Builder.CreateLoad(RethrowPtr)); 2194 CGF.Builder.CreateUnreachable(); 2195 2196 CGF.EmitBlock(FinallyEnd); 2197} 2198 2199void CGObjCMac::EmitThrowStmt(CodeGen::CodeGenFunction &CGF, 2200 const ObjCAtThrowStmt &S) { 2201 llvm::Value *ExceptionAsObject; 2202 2203 if (const Expr *ThrowExpr = S.getThrowExpr()) { 2204 llvm::Value *Exception = CGF.EmitScalarExpr(ThrowExpr); 2205 ExceptionAsObject = 2206 CGF.Builder.CreateBitCast(Exception, ObjCTypes.ObjectPtrTy, "tmp"); 2207 } else { 2208 assert((!CGF.ObjCEHValueStack.empty() && CGF.ObjCEHValueStack.back()) && 2209 "Unexpected rethrow outside @catch block."); 2210 ExceptionAsObject = CGF.ObjCEHValueStack.back(); 2211 } 2212 2213 CGF.Builder.CreateCall(ObjCTypes.ExceptionThrowFn, ExceptionAsObject); 2214 CGF.Builder.CreateUnreachable(); 2215 2216 // Clear the insertion point to indicate we are in unreachable code. 2217 CGF.Builder.ClearInsertionPoint(); 2218} 2219 2220/// EmitObjCWeakRead - Code gen for loading value of a __weak 2221/// object: objc_read_weak (id *src) 2222/// 2223llvm::Value * CGObjCMac::EmitObjCWeakRead(CodeGen::CodeGenFunction &CGF, 2224 llvm::Value *AddrWeakObj) 2225{ 2226 const llvm::Type* DestTy = 2227 cast<llvm::PointerType>(AddrWeakObj->getType())->getElementType(); 2228 AddrWeakObj = CGF.Builder.CreateBitCast(AddrWeakObj, ObjCTypes.PtrObjectPtrTy); 2229 llvm::Value *read_weak = CGF.Builder.CreateCall(ObjCTypes.GcReadWeakFn, 2230 AddrWeakObj, "weakread"); 2231 read_weak = CGF.Builder.CreateBitCast(read_weak, DestTy); 2232 return read_weak; 2233} 2234 2235/// EmitObjCWeakAssign - Code gen for assigning to a __weak object. 2236/// objc_assign_weak (id src, id *dst) 2237/// 2238void CGObjCMac::EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF, 2239 llvm::Value *src, llvm::Value *dst) 2240{ 2241 const llvm::Type * SrcTy = src->getType(); 2242 if (!isa<llvm::PointerType>(SrcTy)) { 2243 unsigned Size = CGM.getTargetData().getTypePaddedSize(SrcTy); 2244 assert(Size <= 8 && "does not support size > 8"); 2245 src = (Size == 4) ? CGF.Builder.CreateBitCast(src, ObjCTypes.IntTy) 2246 : CGF.Builder.CreateBitCast(src, ObjCTypes.LongLongTy); 2247 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy); 2248 } 2249 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy); 2250 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy); 2251 CGF.Builder.CreateCall2(ObjCTypes.GcAssignWeakFn, 2252 src, dst, "weakassign"); 2253 return; 2254} 2255 2256/// EmitObjCGlobalAssign - Code gen for assigning to a __strong object. 2257/// objc_assign_global (id src, id *dst) 2258/// 2259void CGObjCMac::EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF, 2260 llvm::Value *src, llvm::Value *dst) 2261{ 2262 const llvm::Type * SrcTy = src->getType(); 2263 if (!isa<llvm::PointerType>(SrcTy)) { 2264 unsigned Size = CGM.getTargetData().getTypePaddedSize(SrcTy); 2265 assert(Size <= 8 && "does not support size > 8"); 2266 src = (Size == 4) ? CGF.Builder.CreateBitCast(src, ObjCTypes.IntTy) 2267 : CGF.Builder.CreateBitCast(src, ObjCTypes.LongLongTy); 2268 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy); 2269 } 2270 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy); 2271 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy); 2272 CGF.Builder.CreateCall2(ObjCTypes.GcAssignGlobalFn, 2273 src, dst, "globalassign"); 2274 return; 2275} 2276 2277/// EmitObjCIvarAssign - Code gen for assigning to a __strong object. 2278/// objc_assign_ivar (id src, id *dst) 2279/// 2280void CGObjCMac::EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF, 2281 llvm::Value *src, llvm::Value *dst) 2282{ 2283 const llvm::Type * SrcTy = src->getType(); 2284 if (!isa<llvm::PointerType>(SrcTy)) { 2285 unsigned Size = CGM.getTargetData().getTypePaddedSize(SrcTy); 2286 assert(Size <= 8 && "does not support size > 8"); 2287 src = (Size == 4) ? CGF.Builder.CreateBitCast(src, ObjCTypes.IntTy) 2288 : CGF.Builder.CreateBitCast(src, ObjCTypes.LongLongTy); 2289 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy); 2290 } 2291 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy); 2292 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy); 2293 CGF.Builder.CreateCall2(ObjCTypes.GcAssignIvarFn, 2294 src, dst, "assignivar"); 2295 return; 2296} 2297 2298/// EmitObjCStrongCastAssign - Code gen for assigning to a __strong cast object. 2299/// objc_assign_strongCast (id src, id *dst) 2300/// 2301void CGObjCMac::EmitObjCStrongCastAssign(CodeGen::CodeGenFunction &CGF, 2302 llvm::Value *src, llvm::Value *dst) 2303{ 2304 const llvm::Type * SrcTy = src->getType(); 2305 if (!isa<llvm::PointerType>(SrcTy)) { 2306 unsigned Size = CGM.getTargetData().getTypePaddedSize(SrcTy); 2307 assert(Size <= 8 && "does not support size > 8"); 2308 src = (Size == 4) ? CGF.Builder.CreateBitCast(src, ObjCTypes.IntTy) 2309 : CGF.Builder.CreateBitCast(src, ObjCTypes.LongLongTy); 2310 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy); 2311 } 2312 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy); 2313 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy); 2314 CGF.Builder.CreateCall2(ObjCTypes.GcAssignStrongCastFn, 2315 src, dst, "weakassign"); 2316 return; 2317} 2318 2319/// EmitObjCValueForIvar - Code Gen for ivar reference. 2320/// 2321LValue CGObjCMac::EmitObjCValueForIvar(CodeGen::CodeGenFunction &CGF, 2322 QualType ObjectTy, 2323 llvm::Value *BaseValue, 2324 const ObjCIvarDecl *Ivar, 2325 const FieldDecl *Field, 2326 unsigned CVRQualifiers) { 2327 if (Ivar->isBitField()) 2328 return CGF.EmitLValueForBitfield(BaseValue, const_cast<FieldDecl *>(Field), 2329 CVRQualifiers); 2330 // TODO: Add a special case for isa (index 0) 2331 unsigned Index = CGM.getTypes().getLLVMFieldNo(Field); 2332 llvm::Value *V = CGF.Builder.CreateStructGEP(BaseValue, Index, "tmp"); 2333 LValue LV = LValue::MakeAddr(V, 2334 Ivar->getType().getCVRQualifiers()|CVRQualifiers, 2335 CGM.getContext().getObjCGCAttrKind(Ivar->getType())); 2336 LValue::SetObjCIvar(LV, true); 2337 return LV; 2338} 2339 2340llvm::Value *CGObjCMac::EmitIvarOffset(CodeGen::CodeGenFunction &CGF, 2341 ObjCInterfaceDecl *Interface, 2342 const ObjCIvarDecl *Ivar) { 2343 const llvm::StructLayout *Layout = GetInterfaceDeclStructLayout(Interface); 2344 FieldDecl *Field = Interface->lookupFieldDeclForIvar(CGM.getContext(), Ivar); 2345 uint64_t Offset = GetIvarBaseOffset(Layout, Field); 2346 return llvm::ConstantInt::get( 2347 CGM.getTypes().ConvertType(CGM.getContext().LongTy), 2348 Offset); 2349} 2350 2351/* *** Private Interface *** */ 2352 2353/// EmitImageInfo - Emit the image info marker used to encode some module 2354/// level information. 2355/// 2356/// See: <rdr://4810609&4810587&4810587> 2357/// struct IMAGE_INFO { 2358/// unsigned version; 2359/// unsigned flags; 2360/// }; 2361enum ImageInfoFlags { 2362 eImageInfo_FixAndContinue = (1 << 0), // FIXME: Not sure what this implies 2363 eImageInfo_GarbageCollected = (1 << 1), 2364 eImageInfo_GCOnly = (1 << 2) 2365}; 2366 2367void CGObjCMac::EmitImageInfo() { 2368 unsigned version = 0; // Version is unused? 2369 unsigned flags = 0; 2370 2371 // FIXME: Fix and continue? 2372 if (CGM.getLangOptions().getGCMode() != LangOptions::NonGC) 2373 flags |= eImageInfo_GarbageCollected; 2374 if (CGM.getLangOptions().getGCMode() == LangOptions::GCOnly) 2375 flags |= eImageInfo_GCOnly; 2376 2377 // Emitted as int[2]; 2378 llvm::Constant *values[2] = { 2379 llvm::ConstantInt::get(llvm::Type::Int32Ty, version), 2380 llvm::ConstantInt::get(llvm::Type::Int32Ty, flags) 2381 }; 2382 llvm::ArrayType *AT = llvm::ArrayType::get(llvm::Type::Int32Ty, 2); 2383 2384 const char *Section; 2385 if (ObjCABI == 1) 2386 Section = "__OBJC, __image_info,regular"; 2387 else 2388 Section = "__DATA, __objc_imageinfo, regular, no_dead_strip"; 2389 llvm::GlobalVariable *GV = 2390 CreateMetadataVar("\01L_OBJC_IMAGE_INFO", 2391 llvm::ConstantArray::get(AT, values, 2), 2392 Section, 2393 0, 2394 true); 2395 GV->setConstant(true); 2396} 2397 2398 2399// struct objc_module { 2400// unsigned long version; 2401// unsigned long size; 2402// const char *name; 2403// Symtab symtab; 2404// }; 2405 2406// FIXME: Get from somewhere 2407static const int ModuleVersion = 7; 2408 2409void CGObjCMac::EmitModuleInfo() { 2410 uint64_t Size = CGM.getTargetData().getTypePaddedSize(ObjCTypes.ModuleTy); 2411 2412 std::vector<llvm::Constant*> Values(4); 2413 Values[0] = llvm::ConstantInt::get(ObjCTypes.LongTy, ModuleVersion); 2414 Values[1] = llvm::ConstantInt::get(ObjCTypes.LongTy, Size); 2415 // This used to be the filename, now it is unused. <rdr://4327263> 2416 Values[2] = GetClassName(&CGM.getContext().Idents.get("")); 2417 Values[3] = EmitModuleSymbols(); 2418 CreateMetadataVar("\01L_OBJC_MODULES", 2419 llvm::ConstantStruct::get(ObjCTypes.ModuleTy, Values), 2420 "__OBJC,__module_info,regular,no_dead_strip", 2421 4, true); 2422} 2423 2424llvm::Constant *CGObjCMac::EmitModuleSymbols() { 2425 unsigned NumClasses = DefinedClasses.size(); 2426 unsigned NumCategories = DefinedCategories.size(); 2427 2428 // Return null if no symbols were defined. 2429 if (!NumClasses && !NumCategories) 2430 return llvm::Constant::getNullValue(ObjCTypes.SymtabPtrTy); 2431 2432 std::vector<llvm::Constant*> Values(5); 2433 Values[0] = llvm::ConstantInt::get(ObjCTypes.LongTy, 0); 2434 Values[1] = llvm::Constant::getNullValue(ObjCTypes.SelectorPtrTy); 2435 Values[2] = llvm::ConstantInt::get(ObjCTypes.ShortTy, NumClasses); 2436 Values[3] = llvm::ConstantInt::get(ObjCTypes.ShortTy, NumCategories); 2437 2438 // The runtime expects exactly the list of defined classes followed 2439 // by the list of defined categories, in a single array. 2440 std::vector<llvm::Constant*> Symbols(NumClasses + NumCategories); 2441 for (unsigned i=0; i<NumClasses; i++) 2442 Symbols[i] = llvm::ConstantExpr::getBitCast(DefinedClasses[i], 2443 ObjCTypes.Int8PtrTy); 2444 for (unsigned i=0; i<NumCategories; i++) 2445 Symbols[NumClasses + i] = 2446 llvm::ConstantExpr::getBitCast(DefinedCategories[i], 2447 ObjCTypes.Int8PtrTy); 2448 2449 Values[4] = 2450 llvm::ConstantArray::get(llvm::ArrayType::get(ObjCTypes.Int8PtrTy, 2451 NumClasses + NumCategories), 2452 Symbols); 2453 2454 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 2455 2456 llvm::GlobalVariable *GV = 2457 CreateMetadataVar("\01L_OBJC_SYMBOLS", Init, 2458 "__OBJC,__symbols,regular,no_dead_strip", 2459 0, true); 2460 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.SymtabPtrTy); 2461} 2462 2463llvm::Value *CGObjCMac::EmitClassRef(CGBuilderTy &Builder, 2464 const ObjCInterfaceDecl *ID) { 2465 LazySymbols.insert(ID->getIdentifier()); 2466 2467 llvm::GlobalVariable *&Entry = ClassReferences[ID->getIdentifier()]; 2468 2469 if (!Entry) { 2470 llvm::Constant *Casted = 2471 llvm::ConstantExpr::getBitCast(GetClassName(ID->getIdentifier()), 2472 ObjCTypes.ClassPtrTy); 2473 Entry = 2474 CreateMetadataVar("\01L_OBJC_CLASS_REFERENCES_", Casted, 2475 "__OBJC,__cls_refs,literal_pointers,no_dead_strip", 2476 0, true); 2477 } 2478 2479 return Builder.CreateLoad(Entry, false, "tmp"); 2480} 2481 2482llvm::Value *CGObjCMac::EmitSelector(CGBuilderTy &Builder, Selector Sel) { 2483 llvm::GlobalVariable *&Entry = SelectorReferences[Sel]; 2484 2485 if (!Entry) { 2486 llvm::Constant *Casted = 2487 llvm::ConstantExpr::getBitCast(GetMethodVarName(Sel), 2488 ObjCTypes.SelectorPtrTy); 2489 Entry = 2490 CreateMetadataVar("\01L_OBJC_SELECTOR_REFERENCES_", Casted, 2491 "__OBJC,__message_refs,literal_pointers,no_dead_strip", 2492 0, true); 2493 } 2494 2495 return Builder.CreateLoad(Entry, false, "tmp"); 2496} 2497 2498llvm::Constant *CGObjCCommonMac::GetClassName(IdentifierInfo *Ident) { 2499 llvm::GlobalVariable *&Entry = ClassNames[Ident]; 2500 2501 if (!Entry) 2502 Entry = CreateMetadataVar("\01L_OBJC_CLASS_NAME_", 2503 llvm::ConstantArray::get(Ident->getName()), 2504 "__TEXT,__cstring,cstring_literals", 2505 0, true); 2506 2507 return getConstantGEP(Entry, 0, 0); 2508} 2509 2510/// GetInterfaceDeclStructLayout - Get layout for ivars of given 2511/// interface declaration. 2512const llvm::StructLayout *CGObjCCommonMac::GetInterfaceDeclStructLayout( 2513 const ObjCInterfaceDecl *OID) const { 2514 const llvm::Type *InterfaceTy = 2515 CGM.getTypes().ConvertType( 2516 CGM.getContext().getObjCInterfaceType( 2517 const_cast<ObjCInterfaceDecl*>(OID))); 2518 const llvm::StructLayout *Layout = 2519 CGM.getTargetData().getStructLayout(cast<llvm::StructType>(InterfaceTy)); 2520 return Layout; 2521} 2522 2523/// GetIvarLayoutName - Returns a unique constant for the given 2524/// ivar layout bitmap. 2525llvm::Constant *CGObjCCommonMac::GetIvarLayoutName(IdentifierInfo *Ident, 2526 const ObjCCommonTypesHelper &ObjCTypes) { 2527 return llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy); 2528} 2529 2530void CGObjCCommonMac::BuildAggrIvarLayout(const ObjCInterfaceDecl *OI, 2531 const llvm::StructLayout *Layout, 2532 const RecordDecl *RD, 2533 const llvm::SmallVectorImpl<FieldDecl*> &RecFields, 2534 unsigned int BytePos, bool ForStrongLayout, 2535 int &Index, int &SkIndex, bool &HasUnion) { 2536 bool IsUnion = (RD && RD->isUnion()); 2537 uint64_t MaxUnionIvarSize = 0; 2538 uint64_t MaxSkippedUnionIvarSize = 0; 2539 FieldDecl *MaxField = 0; 2540 FieldDecl *MaxSkippedField = 0; 2541 unsigned base = 0; 2542 if (RecFields.empty()) 2543 return; 2544 if (IsUnion) 2545 base = BytePos + GetFieldBaseOffset(OI, Layout, RecFields[0]); 2546 unsigned WordSizeInBits = CGM.getContext().Target.getPointerWidth(0); 2547 unsigned ByteSizeInBits = CGM.getContext().Target.getCharWidth(); 2548 2549 llvm::SmallVector<FieldDecl*, 16> TmpRecFields; 2550 2551 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 2552 FieldDecl *Field = RecFields[i]; 2553 // Skip over unnamed or bitfields 2554 if (!Field->getIdentifier() || Field->isBitField()) 2555 continue; 2556 QualType FQT = Field->getType(); 2557 if (FQT->isRecordType() || FQT->isUnionType()) { 2558 if (FQT->isUnionType()) 2559 HasUnion = true; 2560 else 2561 assert(FQT->isRecordType() && 2562 "only union/record is supported for ivar layout bitmap"); 2563 2564 const RecordType *RT = FQT->getAsRecordType(); 2565 const RecordDecl *RD = RT->getDecl(); 2566 // FIXME - Find a more efficiant way of passing records down. 2567 TmpRecFields.append(RD->field_begin(), RD->field_end()); 2568 // FIXME - Is Layout correct? 2569 BuildAggrIvarLayout(OI, Layout, RD, TmpRecFields, 2570 BytePos + GetFieldBaseOffset(OI, Layout, Field), 2571 ForStrongLayout, Index, SkIndex, 2572 HasUnion); 2573 TmpRecFields.clear(); 2574 continue; 2575 } 2576 2577 if (const ArrayType *Array = CGM.getContext().getAsArrayType(FQT)) { 2578 const ConstantArrayType *CArray = 2579 dyn_cast_or_null<ConstantArrayType>(Array); 2580 assert(CArray && "only array with know element size is supported"); 2581 FQT = CArray->getElementType(); 2582 while (const ArrayType *Array = CGM.getContext().getAsArrayType(FQT)) { 2583 const ConstantArrayType *CArray = 2584 dyn_cast_or_null<ConstantArrayType>(Array); 2585 FQT = CArray->getElementType(); 2586 } 2587 2588 assert(!FQT->isUnionType() && 2589 "layout for array of unions not supported"); 2590 if (FQT->isRecordType()) { 2591 uint64_t ElCount = CArray->getSize().getZExtValue(); 2592 int OldIndex = Index; 2593 int OldSkIndex = SkIndex; 2594 2595 // FIXME - Use a common routine with the above! 2596 const RecordType *RT = FQT->getAsRecordType(); 2597 const RecordDecl *RD = RT->getDecl(); 2598 // FIXME - Find a more efficiant way of passing records down. 2599 TmpRecFields.append(RD->field_begin(), RD->field_end()); 2600 2601 BuildAggrIvarLayout(OI, Layout, RD, 2602 TmpRecFields, 2603 BytePos + GetFieldBaseOffset(OI, Layout, Field), 2604 ForStrongLayout, Index, SkIndex, 2605 HasUnion); 2606 TmpRecFields.clear(); 2607 2608 // Replicate layout information for each array element. Note that 2609 // one element is already done. 2610 uint64_t ElIx = 1; 2611 for (int FirstIndex = Index, FirstSkIndex = SkIndex; 2612 ElIx < ElCount; ElIx++) { 2613 uint64_t Size = CGM.getContext().getTypeSize(RT)/ByteSizeInBits; 2614 for (int i = OldIndex+1; i <= FirstIndex; ++i) 2615 { 2616 GC_IVAR gcivar; 2617 gcivar.ivar_bytepos = IvarsInfo[i].ivar_bytepos + Size*ElIx; 2618 gcivar.ivar_size = IvarsInfo[i].ivar_size; 2619 IvarsInfo.push_back(gcivar); ++Index; 2620 } 2621 2622 for (int i = OldSkIndex+1; i <= FirstSkIndex; ++i) { 2623 GC_IVAR skivar; 2624 skivar.ivar_bytepos = SkipIvars[i].ivar_bytepos + Size*ElIx; 2625 skivar.ivar_size = SkipIvars[i].ivar_size; 2626 SkipIvars.push_back(skivar); ++SkIndex; 2627 } 2628 } 2629 continue; 2630 } 2631 } 2632 // At this point, we are done with Record/Union and array there of. 2633 // For other arrays we are down to its element type. 2634 QualType::GCAttrTypes GCAttr = QualType::GCNone; 2635 do { 2636 if (FQT.isObjCGCStrong() || FQT.isObjCGCWeak()) { 2637 GCAttr = FQT.isObjCGCStrong() ? QualType::Strong : QualType::Weak; 2638 break; 2639 } 2640 else if (CGM.getContext().isObjCObjectPointerType(FQT)) { 2641 GCAttr = QualType::Strong; 2642 break; 2643 } 2644 else if (const PointerType *PT = FQT->getAsPointerType()) { 2645 FQT = PT->getPointeeType(); 2646 } 2647 else { 2648 break; 2649 } 2650 } while (true); 2651 2652 if ((ForStrongLayout && GCAttr == QualType::Strong) 2653 || (!ForStrongLayout && GCAttr == QualType::Weak)) { 2654 if (IsUnion) 2655 { 2656 uint64_t UnionIvarSize = CGM.getContext().getTypeSize(Field->getType()) 2657 / WordSizeInBits; 2658 if (UnionIvarSize > MaxUnionIvarSize) 2659 { 2660 MaxUnionIvarSize = UnionIvarSize; 2661 MaxField = Field; 2662 } 2663 } 2664 else 2665 { 2666 GC_IVAR gcivar; 2667 gcivar.ivar_bytepos = BytePos + GetFieldBaseOffset(OI, Layout, Field); 2668 gcivar.ivar_size = CGM.getContext().getTypeSize(Field->getType()) / 2669 WordSizeInBits; 2670 IvarsInfo.push_back(gcivar); ++Index; 2671 } 2672 } 2673 else if ((ForStrongLayout && 2674 (GCAttr == QualType::GCNone || GCAttr == QualType::Weak)) 2675 || (!ForStrongLayout && GCAttr != QualType::Weak)) { 2676 if (IsUnion) 2677 { 2678 uint64_t UnionIvarSize = CGM.getContext().getTypeSize(Field->getType()); 2679 if (UnionIvarSize > MaxSkippedUnionIvarSize) 2680 { 2681 MaxSkippedUnionIvarSize = UnionIvarSize; 2682 MaxSkippedField = Field; 2683 } 2684 } 2685 else 2686 { 2687 GC_IVAR skivar; 2688 skivar.ivar_bytepos = BytePos + GetFieldBaseOffset(OI, Layout, Field); 2689 skivar.ivar_size = CGM.getContext().getTypeSize(Field->getType()) / 2690 WordSizeInBits; 2691 SkipIvars.push_back(skivar); ++SkIndex; 2692 } 2693 } 2694 } 2695 if (MaxField) { 2696 GC_IVAR gcivar; 2697 gcivar.ivar_bytepos = BytePos + GetFieldBaseOffset(OI, Layout, MaxField); 2698 gcivar.ivar_size = MaxUnionIvarSize; 2699 IvarsInfo.push_back(gcivar); ++Index; 2700 } 2701 2702 if (MaxSkippedField) { 2703 GC_IVAR skivar; 2704 skivar.ivar_bytepos = BytePos + 2705 GetFieldBaseOffset(OI, Layout, MaxSkippedField); 2706 skivar.ivar_size = MaxSkippedUnionIvarSize; 2707 SkipIvars.push_back(skivar); ++SkIndex; 2708 } 2709} 2710 2711static int 2712IvarBytePosCompare(const void *a, const void *b) 2713{ 2714 unsigned int sa = ((CGObjCCommonMac::GC_IVAR *)a)->ivar_bytepos; 2715 unsigned int sb = ((CGObjCCommonMac::GC_IVAR *)b)->ivar_bytepos; 2716 2717 if (sa < sb) 2718 return -1; 2719 if (sa > sb) 2720 return 1; 2721 return 0; 2722} 2723 2724/// BuildIvarLayout - Builds ivar layout bitmap for the class 2725/// implementation for the __strong or __weak case. 2726/// The layout map displays which words in ivar list must be skipped 2727/// and which must be scanned by GC (see below). String is built of bytes. 2728/// Each byte is divided up in two nibbles (4-bit each). Left nibble is count 2729/// of words to skip and right nibble is count of words to scan. So, each 2730/// nibble represents up to 15 workds to skip or scan. Skipping the rest is 2731/// represented by a 0x00 byte which also ends the string. 2732/// 1. when ForStrongLayout is true, following ivars are scanned: 2733/// - id, Class 2734/// - object * 2735/// - __strong anything 2736/// 2737/// 2. When ForStrongLayout is false, following ivars are scanned: 2738/// - __weak anything 2739/// 2740llvm::Constant *CGObjCCommonMac::BuildIvarLayout( 2741 const ObjCImplementationDecl *OMD, 2742 bool ForStrongLayout) { 2743 int Index = -1; 2744 int SkIndex = -1; 2745 bool hasUnion = false; 2746 int SkipScan; 2747 unsigned int WordsToScan, WordsToSkip; 2748 const llvm::Type *PtrTy = llvm::PointerType::getUnqual(llvm::Type::Int8Ty); 2749 if (CGM.getLangOptions().getGCMode() == LangOptions::NonGC) 2750 return llvm::Constant::getNullValue(PtrTy); 2751 2752 llvm::SmallVector<FieldDecl*, 32> RecFields; 2753 const ObjCInterfaceDecl *OI = OMD->getClassInterface(); 2754 CGM.getContext().CollectObjCIvars(OI, RecFields); 2755 if (RecFields.empty()) 2756 return llvm::Constant::getNullValue(PtrTy); 2757 2758 SkipIvars.clear(); 2759 IvarsInfo.clear(); 2760 2761 const llvm::StructLayout *Layout = GetInterfaceDeclStructLayout(OI); 2762 BuildAggrIvarLayout(OI, Layout, 0, RecFields, 0, ForStrongLayout, 2763 Index, SkIndex, hasUnion); 2764 if (Index == -1) 2765 return llvm::Constant::getNullValue(PtrTy); 2766 2767 // Sort on byte position in case we encounterred a union nested in 2768 // the ivar list. 2769 if (hasUnion && !IvarsInfo.empty()) 2770 qsort(&IvarsInfo[0], Index+1, sizeof(GC_IVAR), IvarBytePosCompare); 2771 if (hasUnion && !SkipIvars.empty()) 2772 qsort(&SkipIvars[0], Index+1, sizeof(GC_IVAR), IvarBytePosCompare); 2773 2774 // Build the string of skip/scan nibbles 2775 SkipScan = -1; 2776 SkipScanIvars.clear(); 2777 unsigned int WordSize = 2778 CGM.getTypes().getTargetData().getTypePaddedSize(PtrTy); 2779 if (IvarsInfo[0].ivar_bytepos == 0) { 2780 WordsToSkip = 0; 2781 WordsToScan = IvarsInfo[0].ivar_size; 2782 } 2783 else { 2784 WordsToSkip = IvarsInfo[0].ivar_bytepos/WordSize; 2785 WordsToScan = IvarsInfo[0].ivar_size; 2786 } 2787 for (unsigned int i=1, Last=IvarsInfo.size(); i != Last; i++) 2788 { 2789 unsigned int TailPrevGCObjC = 2790 IvarsInfo[i-1].ivar_bytepos + IvarsInfo[i-1].ivar_size * WordSize; 2791 if (IvarsInfo[i].ivar_bytepos == TailPrevGCObjC) 2792 { 2793 // consecutive 'scanned' object pointers. 2794 WordsToScan += IvarsInfo[i].ivar_size; 2795 } 2796 else 2797 { 2798 // Skip over 'gc'able object pointer which lay over each other. 2799 if (TailPrevGCObjC > IvarsInfo[i].ivar_bytepos) 2800 continue; 2801 // Must skip over 1 or more words. We save current skip/scan values 2802 // and start a new pair. 2803 SKIP_SCAN SkScan; 2804 SkScan.skip = WordsToSkip; 2805 SkScan.scan = WordsToScan; 2806 SkipScanIvars.push_back(SkScan); ++SkipScan; 2807 2808 // Skip the hole. 2809 SkScan.skip = (IvarsInfo[i].ivar_bytepos - TailPrevGCObjC) / WordSize; 2810 SkScan.scan = 0; 2811 SkipScanIvars.push_back(SkScan); ++SkipScan; 2812 WordsToSkip = 0; 2813 WordsToScan = IvarsInfo[i].ivar_size; 2814 } 2815 } 2816 if (WordsToScan > 0) 2817 { 2818 SKIP_SCAN SkScan; 2819 SkScan.skip = WordsToSkip; 2820 SkScan.scan = WordsToScan; 2821 SkipScanIvars.push_back(SkScan); ++SkipScan; 2822 } 2823 2824 bool BytesSkipped = false; 2825 if (!SkipIvars.empty()) 2826 { 2827 int LastByteSkipped = 2828 SkipIvars[SkIndex].ivar_bytepos + SkipIvars[SkIndex].ivar_size; 2829 int LastByteScanned = 2830 IvarsInfo[Index].ivar_bytepos + IvarsInfo[Index].ivar_size * WordSize; 2831 BytesSkipped = (LastByteSkipped > LastByteScanned); 2832 // Compute number of bytes to skip at the tail end of the last ivar scanned. 2833 if (BytesSkipped) 2834 { 2835 unsigned int TotalWords = (LastByteSkipped + (WordSize -1)) / WordSize; 2836 SKIP_SCAN SkScan; 2837 SkScan.skip = TotalWords - (LastByteScanned/WordSize); 2838 SkScan.scan = 0; 2839 SkipScanIvars.push_back(SkScan); ++SkipScan; 2840 } 2841 } 2842 // Mini optimization of nibbles such that an 0xM0 followed by 0x0N is produced 2843 // as 0xMN. 2844 for (int i = 0; i <= SkipScan; i++) 2845 { 2846 if ((i < SkipScan) && SkipScanIvars[i].skip && SkipScanIvars[i].scan == 0 2847 && SkipScanIvars[i+1].skip == 0 && SkipScanIvars[i+1].scan) { 2848 // 0xM0 followed by 0x0N detected. 2849 SkipScanIvars[i].scan = SkipScanIvars[i+1].scan; 2850 for (int j = i+1; j < SkipScan; j++) 2851 SkipScanIvars[j] = SkipScanIvars[j+1]; 2852 --SkipScan; 2853 } 2854 } 2855 2856 // Generate the string. 2857 std::string BitMap; 2858 for (int i = 0; i <= SkipScan; i++) 2859 { 2860 unsigned char byte; 2861 unsigned int skip_small = SkipScanIvars[i].skip % 0xf; 2862 unsigned int scan_small = SkipScanIvars[i].scan % 0xf; 2863 unsigned int skip_big = SkipScanIvars[i].skip / 0xf; 2864 unsigned int scan_big = SkipScanIvars[i].scan / 0xf; 2865 2866 if (skip_small > 0 || skip_big > 0) 2867 BytesSkipped = true; 2868 // first skip big. 2869 for (unsigned int ix = 0; ix < skip_big; ix++) 2870 BitMap += (unsigned char)(0xf0); 2871 2872 // next (skip small, scan) 2873 if (skip_small) 2874 { 2875 byte = skip_small << 4; 2876 if (scan_big > 0) 2877 { 2878 byte |= 0xf; 2879 --scan_big; 2880 } 2881 else if (scan_small) 2882 { 2883 byte |= scan_small; 2884 scan_small = 0; 2885 } 2886 BitMap += byte; 2887 } 2888 // next scan big 2889 for (unsigned int ix = 0; ix < scan_big; ix++) 2890 BitMap += (unsigned char)(0x0f); 2891 // last scan small 2892 if (scan_small) 2893 { 2894 byte = scan_small; 2895 BitMap += byte; 2896 } 2897 } 2898 // null terminate string. 2899 unsigned char zero = 0; 2900 BitMap += zero; 2901 // if ivar_layout bitmap is all 1 bits (nothing skipped) then use NULL as 2902 // final layout. 2903 if (ForStrongLayout && !BytesSkipped) 2904 return llvm::Constant::getNullValue(PtrTy); 2905 llvm::GlobalVariable * Entry = CreateMetadataVar("\01L_OBJC_CLASS_NAME_", 2906 llvm::ConstantArray::get(BitMap.c_str()), 2907 "__TEXT,__cstring,cstring_literals", 2908 0, true); 2909 // FIXME. Need a commomand-line option for this eventually. 2910 if (ForStrongLayout) 2911 printf("\nstrong ivar layout: "); 2912 else 2913 printf("\nweak ivar layout: "); 2914 const unsigned char *s = (unsigned char*)BitMap.c_str(); 2915 for (unsigned i = 0; i < BitMap.size(); i++) 2916 if (!(s[i] & 0xf0)) 2917 printf("0x0%x%s", s[i], s[i] != 0 ? ", " : ""); 2918 else 2919 printf("0x%x%s", s[i], s[i] != 0 ? ", " : ""); 2920 printf("\n"); 2921 2922 return getConstantGEP(Entry, 0, 0); 2923} 2924 2925llvm::Constant *CGObjCCommonMac::GetMethodVarName(Selector Sel) { 2926 llvm::GlobalVariable *&Entry = MethodVarNames[Sel]; 2927 2928 // FIXME: Avoid std::string copying. 2929 if (!Entry) 2930 Entry = CreateMetadataVar("\01L_OBJC_METH_VAR_NAME_", 2931 llvm::ConstantArray::get(Sel.getAsString()), 2932 "__TEXT,__cstring,cstring_literals", 2933 0, true); 2934 2935 return getConstantGEP(Entry, 0, 0); 2936} 2937 2938// FIXME: Merge into a single cstring creation function. 2939llvm::Constant *CGObjCCommonMac::GetMethodVarName(IdentifierInfo *ID) { 2940 return GetMethodVarName(CGM.getContext().Selectors.getNullarySelector(ID)); 2941} 2942 2943// FIXME: Merge into a single cstring creation function. 2944llvm::Constant *CGObjCCommonMac::GetMethodVarName(const std::string &Name) { 2945 return GetMethodVarName(&CGM.getContext().Idents.get(Name)); 2946} 2947 2948llvm::Constant *CGObjCCommonMac::GetMethodVarType(FieldDecl *Field) { 2949 std::string TypeStr; 2950 CGM.getContext().getObjCEncodingForType(Field->getType(), TypeStr, Field); 2951 2952 llvm::GlobalVariable *&Entry = MethodVarTypes[TypeStr]; 2953 2954 if (!Entry) 2955 Entry = CreateMetadataVar("\01L_OBJC_METH_VAR_TYPE_", 2956 llvm::ConstantArray::get(TypeStr), 2957 "__TEXT,__cstring,cstring_literals", 2958 0, true); 2959 2960 return getConstantGEP(Entry, 0, 0); 2961} 2962 2963llvm::Constant *CGObjCCommonMac::GetMethodVarType(const ObjCMethodDecl *D) { 2964 std::string TypeStr; 2965 CGM.getContext().getObjCEncodingForMethodDecl(const_cast<ObjCMethodDecl*>(D), 2966 TypeStr); 2967 2968 llvm::GlobalVariable *&Entry = MethodVarTypes[TypeStr]; 2969 2970 if (!Entry) { 2971 llvm::Constant *C = llvm::ConstantArray::get(TypeStr); 2972 Entry = 2973 new llvm::GlobalVariable(C->getType(), false, 2974 llvm::GlobalValue::InternalLinkage, 2975 C, "\01L_OBJC_METH_VAR_TYPE_", 2976 &CGM.getModule()); 2977 Entry->setSection("__TEXT,__cstring,cstring_literals"); 2978 UsedGlobals.push_back(Entry); 2979 } 2980 2981 return getConstantGEP(Entry, 0, 0); 2982} 2983 2984// FIXME: Merge into a single cstring creation function. 2985llvm::Constant *CGObjCCommonMac::GetPropertyName(IdentifierInfo *Ident) { 2986 llvm::GlobalVariable *&Entry = PropertyNames[Ident]; 2987 2988 if (!Entry) 2989 Entry = CreateMetadataVar("\01L_OBJC_PROP_NAME_ATTR_", 2990 llvm::ConstantArray::get(Ident->getName()), 2991 "__TEXT,__cstring,cstring_literals", 2992 0, true); 2993 2994 return getConstantGEP(Entry, 0, 0); 2995} 2996 2997// FIXME: Merge into a single cstring creation function. 2998// FIXME: This Decl should be more precise. 2999llvm::Constant * 3000 CGObjCCommonMac::GetPropertyTypeString(const ObjCPropertyDecl *PD, 3001 const Decl *Container) { 3002 std::string TypeStr; 3003 CGM.getContext().getObjCEncodingForPropertyDecl(PD, Container, TypeStr); 3004 return GetPropertyName(&CGM.getContext().Idents.get(TypeStr)); 3005} 3006 3007void CGObjCCommonMac::GetNameForMethod(const ObjCMethodDecl *D, 3008 const ObjCContainerDecl *CD, 3009 std::string &NameOut) { 3010 // FIXME: Find the mangling GCC uses. 3011 NameOut = (D->isInstanceMethod() ? "-" : "+"); 3012 NameOut += '['; 3013 assert (CD && "Missing container decl in GetNameForMethod"); 3014 NameOut += CD->getNameAsString(); 3015 // FIXME. For a method in a category, (CAT_NAME) is inserted here. 3016 // Right now! there is not enough info. to do this. 3017 NameOut += ' '; 3018 NameOut += D->getSelector().getAsString(); 3019 NameOut += ']'; 3020} 3021 3022/// GetFirstIvarInRecord - This routine returns the record for the 3023/// implementation of the fiven class OID. It also returns field 3024/// corresponding to the first ivar in the class in FIV. It also 3025/// returns the one before the first ivar. 3026/// 3027const RecordDecl *CGObjCCommonMac::GetFirstIvarInRecord( 3028 const ObjCInterfaceDecl *OID, 3029 RecordDecl::field_iterator &FIV, 3030 RecordDecl::field_iterator &PIV) { 3031 int countSuperClassIvars = countInheritedIvars(OID->getSuperClass()); 3032 const RecordDecl *RD = CGM.getContext().addRecordToClass(OID); 3033 RecordDecl::field_iterator ifield = RD->field_begin(); 3034 RecordDecl::field_iterator pfield = RD->field_end(); 3035 while (countSuperClassIvars-- > 0) { 3036 pfield = ifield; 3037 ++ifield; 3038 } 3039 FIV = ifield; 3040 PIV = pfield; 3041 return RD; 3042} 3043 3044void CGObjCMac::FinishModule() { 3045 EmitModuleInfo(); 3046 3047 // Emit the dummy bodies for any protocols which were referenced but 3048 // never defined. 3049 for (llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*>::iterator 3050 i = Protocols.begin(), e = Protocols.end(); i != e; ++i) { 3051 if (i->second->hasInitializer()) 3052 continue; 3053 3054 std::vector<llvm::Constant*> Values(5); 3055 Values[0] = llvm::Constant::getNullValue(ObjCTypes.ProtocolExtensionPtrTy); 3056 Values[1] = GetClassName(i->first); 3057 Values[2] = llvm::Constant::getNullValue(ObjCTypes.ProtocolListPtrTy); 3058 Values[3] = Values[4] = 3059 llvm::Constant::getNullValue(ObjCTypes.MethodDescriptionListPtrTy); 3060 i->second->setLinkage(llvm::GlobalValue::InternalLinkage); 3061 i->second->setInitializer(llvm::ConstantStruct::get(ObjCTypes.ProtocolTy, 3062 Values)); 3063 } 3064 3065 std::vector<llvm::Constant*> Used; 3066 for (std::vector<llvm::GlobalVariable*>::iterator i = UsedGlobals.begin(), 3067 e = UsedGlobals.end(); i != e; ++i) { 3068 Used.push_back(llvm::ConstantExpr::getBitCast(*i, ObjCTypes.Int8PtrTy)); 3069 } 3070 3071 llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.Int8PtrTy, Used.size()); 3072 llvm::GlobalValue *GV = 3073 new llvm::GlobalVariable(AT, false, 3074 llvm::GlobalValue::AppendingLinkage, 3075 llvm::ConstantArray::get(AT, Used), 3076 "llvm.used", 3077 &CGM.getModule()); 3078 3079 GV->setSection("llvm.metadata"); 3080 3081 // Add assembler directives to add lazy undefined symbol references 3082 // for classes which are referenced but not defined. This is 3083 // important for correct linker interaction. 3084 3085 // FIXME: Uh, this isn't particularly portable. 3086 std::stringstream s; 3087 3088 if (!CGM.getModule().getModuleInlineAsm().empty()) 3089 s << "\n"; 3090 3091 for (std::set<IdentifierInfo*>::iterator i = LazySymbols.begin(), 3092 e = LazySymbols.end(); i != e; ++i) { 3093 s << "\t.lazy_reference .objc_class_name_" << (*i)->getName() << "\n"; 3094 } 3095 for (std::set<IdentifierInfo*>::iterator i = DefinedSymbols.begin(), 3096 e = DefinedSymbols.end(); i != e; ++i) { 3097 s << "\t.objc_class_name_" << (*i)->getName() << "=0\n" 3098 << "\t.globl .objc_class_name_" << (*i)->getName() << "\n"; 3099 } 3100 3101 CGM.getModule().appendModuleInlineAsm(s.str()); 3102} 3103 3104CGObjCNonFragileABIMac::CGObjCNonFragileABIMac(CodeGen::CodeGenModule &cgm) 3105 : CGObjCCommonMac(cgm), 3106 ObjCTypes(cgm) 3107{ 3108 ObjCEmptyCacheVar = ObjCEmptyVtableVar = NULL; 3109 ObjCABI = 2; 3110} 3111 3112/* *** */ 3113 3114ObjCCommonTypesHelper::ObjCCommonTypesHelper(CodeGen::CodeGenModule &cgm) 3115: CGM(cgm) 3116{ 3117 CodeGen::CodeGenTypes &Types = CGM.getTypes(); 3118 ASTContext &Ctx = CGM.getContext(); 3119 3120 ShortTy = Types.ConvertType(Ctx.ShortTy); 3121 IntTy = Types.ConvertType(Ctx.IntTy); 3122 LongTy = Types.ConvertType(Ctx.LongTy); 3123 LongLongTy = Types.ConvertType(Ctx.LongLongTy); 3124 Int8PtrTy = llvm::PointerType::getUnqual(llvm::Type::Int8Ty); 3125 3126 ObjectPtrTy = Types.ConvertType(Ctx.getObjCIdType()); 3127 PtrObjectPtrTy = llvm::PointerType::getUnqual(ObjectPtrTy); 3128 SelectorPtrTy = Types.ConvertType(Ctx.getObjCSelType()); 3129 3130 // FIXME: It would be nice to unify this with the opaque type, so 3131 // that the IR comes out a bit cleaner. 3132 const llvm::Type *T = Types.ConvertType(Ctx.getObjCProtoType()); 3133 ExternalProtocolPtrTy = llvm::PointerType::getUnqual(T); 3134 3135 // I'm not sure I like this. The implicit coordination is a bit 3136 // gross. We should solve this in a reasonable fashion because this 3137 // is a pretty common task (match some runtime data structure with 3138 // an LLVM data structure). 3139 3140 // FIXME: This is leaked. 3141 // FIXME: Merge with rewriter code? 3142 3143 // struct _objc_super { 3144 // id self; 3145 // Class cls; 3146 // } 3147 RecordDecl *RD = RecordDecl::Create(Ctx, TagDecl::TK_struct, 0, 3148 SourceLocation(), 3149 &Ctx.Idents.get("_objc_super")); 3150 RD->addDecl(FieldDecl::Create(Ctx, RD, SourceLocation(), 0, 3151 Ctx.getObjCIdType(), 0, false)); 3152 RD->addDecl(FieldDecl::Create(Ctx, RD, SourceLocation(), 0, 3153 Ctx.getObjCClassType(), 0, false)); 3154 RD->completeDefinition(Ctx); 3155 3156 SuperCTy = Ctx.getTagDeclType(RD); 3157 SuperPtrCTy = Ctx.getPointerType(SuperCTy); 3158 3159 SuperTy = cast<llvm::StructType>(Types.ConvertType(SuperCTy)); 3160 SuperPtrTy = llvm::PointerType::getUnqual(SuperTy); 3161 3162 // struct _prop_t { 3163 // char *name; 3164 // char *attributes; 3165 // } 3166 PropertyTy = llvm::StructType::get(Int8PtrTy, 3167 Int8PtrTy, 3168 NULL); 3169 CGM.getModule().addTypeName("struct._prop_t", 3170 PropertyTy); 3171 3172 // struct _prop_list_t { 3173 // uint32_t entsize; // sizeof(struct _prop_t) 3174 // uint32_t count_of_properties; 3175 // struct _prop_t prop_list[count_of_properties]; 3176 // } 3177 PropertyListTy = llvm::StructType::get(IntTy, 3178 IntTy, 3179 llvm::ArrayType::get(PropertyTy, 0), 3180 NULL); 3181 CGM.getModule().addTypeName("struct._prop_list_t", 3182 PropertyListTy); 3183 // struct _prop_list_t * 3184 PropertyListPtrTy = llvm::PointerType::getUnqual(PropertyListTy); 3185 3186 // struct _objc_method { 3187 // SEL _cmd; 3188 // char *method_type; 3189 // char *_imp; 3190 // } 3191 MethodTy = llvm::StructType::get(SelectorPtrTy, 3192 Int8PtrTy, 3193 Int8PtrTy, 3194 NULL); 3195 CGM.getModule().addTypeName("struct._objc_method", MethodTy); 3196 3197 // struct _objc_cache * 3198 CacheTy = llvm::OpaqueType::get(); 3199 CGM.getModule().addTypeName("struct._objc_cache", CacheTy); 3200 CachePtrTy = llvm::PointerType::getUnqual(CacheTy); 3201 3202 // Property manipulation functions. 3203 3204 QualType IdType = Ctx.getObjCIdType(); 3205 QualType SelType = Ctx.getObjCSelType(); 3206 llvm::SmallVector<QualType,16> Params; 3207 const llvm::FunctionType *FTy; 3208 3209 // id objc_getProperty (id, SEL, ptrdiff_t, bool) 3210 Params.push_back(IdType); 3211 Params.push_back(SelType); 3212 Params.push_back(Ctx.LongTy); 3213 Params.push_back(Ctx.BoolTy); 3214 FTy = Types.GetFunctionType(Types.getFunctionInfo(IdType, Params), 3215 false); 3216 GetPropertyFn = CGM.CreateRuntimeFunction(FTy, "objc_getProperty"); 3217 3218 // void objc_setProperty (id, SEL, ptrdiff_t, id, bool, bool) 3219 Params.clear(); 3220 Params.push_back(IdType); 3221 Params.push_back(SelType); 3222 Params.push_back(Ctx.LongTy); 3223 Params.push_back(IdType); 3224 Params.push_back(Ctx.BoolTy); 3225 Params.push_back(Ctx.BoolTy); 3226 FTy = Types.GetFunctionType(Types.getFunctionInfo(Ctx.VoidTy, Params), false); 3227 SetPropertyFn = CGM.CreateRuntimeFunction(FTy, "objc_setProperty"); 3228 3229 // Enumeration mutation. 3230 3231 // void objc_enumerationMutation (id) 3232 Params.clear(); 3233 Params.push_back(IdType); 3234 FTy = Types.GetFunctionType(Types.getFunctionInfo(Ctx.VoidTy, Params), false); 3235 EnumerationMutationFn = CGM.CreateRuntimeFunction(FTy, 3236 "objc_enumerationMutation"); 3237 3238 // gc's API 3239 // id objc_read_weak (id *) 3240 Params.clear(); 3241 Params.push_back(Ctx.getPointerType(IdType)); 3242 FTy = Types.GetFunctionType(Types.getFunctionInfo(IdType, Params), false); 3243 GcReadWeakFn = CGM.CreateRuntimeFunction(FTy, "objc_read_weak"); 3244 3245 // id objc_assign_weak (id, id *) 3246 Params.clear(); 3247 Params.push_back(IdType); 3248 Params.push_back(Ctx.getPointerType(IdType)); 3249 3250 FTy = Types.GetFunctionType(Types.getFunctionInfo(IdType, Params), false); 3251 GcAssignWeakFn = CGM.CreateRuntimeFunction(FTy, "objc_assign_weak"); 3252 GcAssignGlobalFn = CGM.CreateRuntimeFunction(FTy, "objc_assign_global"); 3253 GcAssignIvarFn = CGM.CreateRuntimeFunction(FTy, "objc_assign_ivar"); 3254 GcAssignStrongCastFn = 3255 CGM.CreateRuntimeFunction(FTy, "objc_assign_strongCast"); 3256 3257 // void objc_exception_throw(id) 3258 Params.clear(); 3259 Params.push_back(IdType); 3260 3261 FTy = Types.GetFunctionType(Types.getFunctionInfo(Ctx.VoidTy, Params), false); 3262 ExceptionThrowFn = 3263 CGM.CreateRuntimeFunction(FTy, "objc_exception_throw"); 3264 3265 // synchronized APIs 3266 // void objc_sync_enter (id) 3267 // void objc_sync_exit (id) 3268 Params.clear(); 3269 Params.push_back(IdType); 3270 3271 FTy = Types.GetFunctionType(Types.getFunctionInfo(Ctx.VoidTy, Params), false); 3272 SyncEnterFn = CGM.CreateRuntimeFunction(FTy, "objc_sync_enter"); 3273 SyncExitFn = CGM.CreateRuntimeFunction(FTy, "objc_sync_exit"); 3274} 3275 3276ObjCTypesHelper::ObjCTypesHelper(CodeGen::CodeGenModule &cgm) 3277 : ObjCCommonTypesHelper(cgm) 3278{ 3279 // struct _objc_method_description { 3280 // SEL name; 3281 // char *types; 3282 // } 3283 MethodDescriptionTy = 3284 llvm::StructType::get(SelectorPtrTy, 3285 Int8PtrTy, 3286 NULL); 3287 CGM.getModule().addTypeName("struct._objc_method_description", 3288 MethodDescriptionTy); 3289 3290 // struct _objc_method_description_list { 3291 // int count; 3292 // struct _objc_method_description[1]; 3293 // } 3294 MethodDescriptionListTy = 3295 llvm::StructType::get(IntTy, 3296 llvm::ArrayType::get(MethodDescriptionTy, 0), 3297 NULL); 3298 CGM.getModule().addTypeName("struct._objc_method_description_list", 3299 MethodDescriptionListTy); 3300 3301 // struct _objc_method_description_list * 3302 MethodDescriptionListPtrTy = 3303 llvm::PointerType::getUnqual(MethodDescriptionListTy); 3304 3305 // Protocol description structures 3306 3307 // struct _objc_protocol_extension { 3308 // uint32_t size; // sizeof(struct _objc_protocol_extension) 3309 // struct _objc_method_description_list *optional_instance_methods; 3310 // struct _objc_method_description_list *optional_class_methods; 3311 // struct _objc_property_list *instance_properties; 3312 // } 3313 ProtocolExtensionTy = 3314 llvm::StructType::get(IntTy, 3315 MethodDescriptionListPtrTy, 3316 MethodDescriptionListPtrTy, 3317 PropertyListPtrTy, 3318 NULL); 3319 CGM.getModule().addTypeName("struct._objc_protocol_extension", 3320 ProtocolExtensionTy); 3321 3322 // struct _objc_protocol_extension * 3323 ProtocolExtensionPtrTy = llvm::PointerType::getUnqual(ProtocolExtensionTy); 3324 3325 // Handle recursive construction of Protocol and ProtocolList types 3326 3327 llvm::PATypeHolder ProtocolTyHolder = llvm::OpaqueType::get(); 3328 llvm::PATypeHolder ProtocolListTyHolder = llvm::OpaqueType::get(); 3329 3330 const llvm::Type *T = 3331 llvm::StructType::get(llvm::PointerType::getUnqual(ProtocolListTyHolder), 3332 LongTy, 3333 llvm::ArrayType::get(ProtocolTyHolder, 0), 3334 NULL); 3335 cast<llvm::OpaqueType>(ProtocolListTyHolder.get())->refineAbstractTypeTo(T); 3336 3337 // struct _objc_protocol { 3338 // struct _objc_protocol_extension *isa; 3339 // char *protocol_name; 3340 // struct _objc_protocol **_objc_protocol_list; 3341 // struct _objc_method_description_list *instance_methods; 3342 // struct _objc_method_description_list *class_methods; 3343 // } 3344 T = llvm::StructType::get(ProtocolExtensionPtrTy, 3345 Int8PtrTy, 3346 llvm::PointerType::getUnqual(ProtocolListTyHolder), 3347 MethodDescriptionListPtrTy, 3348 MethodDescriptionListPtrTy, 3349 NULL); 3350 cast<llvm::OpaqueType>(ProtocolTyHolder.get())->refineAbstractTypeTo(T); 3351 3352 ProtocolListTy = cast<llvm::StructType>(ProtocolListTyHolder.get()); 3353 CGM.getModule().addTypeName("struct._objc_protocol_list", 3354 ProtocolListTy); 3355 // struct _objc_protocol_list * 3356 ProtocolListPtrTy = llvm::PointerType::getUnqual(ProtocolListTy); 3357 3358 ProtocolTy = cast<llvm::StructType>(ProtocolTyHolder.get()); 3359 CGM.getModule().addTypeName("struct._objc_protocol", ProtocolTy); 3360 ProtocolPtrTy = llvm::PointerType::getUnqual(ProtocolTy); 3361 3362 // Class description structures 3363 3364 // struct _objc_ivar { 3365 // char *ivar_name; 3366 // char *ivar_type; 3367 // int ivar_offset; 3368 // } 3369 IvarTy = llvm::StructType::get(Int8PtrTy, 3370 Int8PtrTy, 3371 IntTy, 3372 NULL); 3373 CGM.getModule().addTypeName("struct._objc_ivar", IvarTy); 3374 3375 // struct _objc_ivar_list * 3376 IvarListTy = llvm::OpaqueType::get(); 3377 CGM.getModule().addTypeName("struct._objc_ivar_list", IvarListTy); 3378 IvarListPtrTy = llvm::PointerType::getUnqual(IvarListTy); 3379 3380 // struct _objc_method_list * 3381 MethodListTy = llvm::OpaqueType::get(); 3382 CGM.getModule().addTypeName("struct._objc_method_list", MethodListTy); 3383 MethodListPtrTy = llvm::PointerType::getUnqual(MethodListTy); 3384 3385 // struct _objc_class_extension * 3386 ClassExtensionTy = 3387 llvm::StructType::get(IntTy, 3388 Int8PtrTy, 3389 PropertyListPtrTy, 3390 NULL); 3391 CGM.getModule().addTypeName("struct._objc_class_extension", ClassExtensionTy); 3392 ClassExtensionPtrTy = llvm::PointerType::getUnqual(ClassExtensionTy); 3393 3394 llvm::PATypeHolder ClassTyHolder = llvm::OpaqueType::get(); 3395 3396 // struct _objc_class { 3397 // Class isa; 3398 // Class super_class; 3399 // char *name; 3400 // long version; 3401 // long info; 3402 // long instance_size; 3403 // struct _objc_ivar_list *ivars; 3404 // struct _objc_method_list *methods; 3405 // struct _objc_cache *cache; 3406 // struct _objc_protocol_list *protocols; 3407 // char *ivar_layout; 3408 // struct _objc_class_ext *ext; 3409 // }; 3410 T = llvm::StructType::get(llvm::PointerType::getUnqual(ClassTyHolder), 3411 llvm::PointerType::getUnqual(ClassTyHolder), 3412 Int8PtrTy, 3413 LongTy, 3414 LongTy, 3415 LongTy, 3416 IvarListPtrTy, 3417 MethodListPtrTy, 3418 CachePtrTy, 3419 ProtocolListPtrTy, 3420 Int8PtrTy, 3421 ClassExtensionPtrTy, 3422 NULL); 3423 cast<llvm::OpaqueType>(ClassTyHolder.get())->refineAbstractTypeTo(T); 3424 3425 ClassTy = cast<llvm::StructType>(ClassTyHolder.get()); 3426 CGM.getModule().addTypeName("struct._objc_class", ClassTy); 3427 ClassPtrTy = llvm::PointerType::getUnqual(ClassTy); 3428 3429 // struct _objc_category { 3430 // char *category_name; 3431 // char *class_name; 3432 // struct _objc_method_list *instance_method; 3433 // struct _objc_method_list *class_method; 3434 // uint32_t size; // sizeof(struct _objc_category) 3435 // struct _objc_property_list *instance_properties;// category's @property 3436 // } 3437 CategoryTy = llvm::StructType::get(Int8PtrTy, 3438 Int8PtrTy, 3439 MethodListPtrTy, 3440 MethodListPtrTy, 3441 ProtocolListPtrTy, 3442 IntTy, 3443 PropertyListPtrTy, 3444 NULL); 3445 CGM.getModule().addTypeName("struct._objc_category", CategoryTy); 3446 3447 // Global metadata structures 3448 3449 // struct _objc_symtab { 3450 // long sel_ref_cnt; 3451 // SEL *refs; 3452 // short cls_def_cnt; 3453 // short cat_def_cnt; 3454 // char *defs[cls_def_cnt + cat_def_cnt]; 3455 // } 3456 SymtabTy = llvm::StructType::get(LongTy, 3457 SelectorPtrTy, 3458 ShortTy, 3459 ShortTy, 3460 llvm::ArrayType::get(Int8PtrTy, 0), 3461 NULL); 3462 CGM.getModule().addTypeName("struct._objc_symtab", SymtabTy); 3463 SymtabPtrTy = llvm::PointerType::getUnqual(SymtabTy); 3464 3465 // struct _objc_module { 3466 // long version; 3467 // long size; // sizeof(struct _objc_module) 3468 // char *name; 3469 // struct _objc_symtab* symtab; 3470 // } 3471 ModuleTy = 3472 llvm::StructType::get(LongTy, 3473 LongTy, 3474 Int8PtrTy, 3475 SymtabPtrTy, 3476 NULL); 3477 CGM.getModule().addTypeName("struct._objc_module", ModuleTy); 3478 3479 // Message send functions. 3480 3481 // id objc_msgSend (id, SEL, ...) 3482 std::vector<const llvm::Type*> Params; 3483 Params.push_back(ObjectPtrTy); 3484 Params.push_back(SelectorPtrTy); 3485 MessageSendFn = 3486 CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 3487 Params, 3488 true), 3489 "objc_msgSend"); 3490 3491 // id objc_msgSend_stret (id, SEL, ...) 3492 Params.clear(); 3493 Params.push_back(ObjectPtrTy); 3494 Params.push_back(SelectorPtrTy); 3495 MessageSendStretFn = 3496 CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::VoidTy, 3497 Params, 3498 true), 3499 "objc_msgSend_stret"); 3500 3501 // 3502 Params.clear(); 3503 Params.push_back(ObjectPtrTy); 3504 Params.push_back(SelectorPtrTy); 3505 // FIXME: This should be long double on x86_64? 3506 // [double | long double] objc_msgSend_fpret(id self, SEL op, ...) 3507 MessageSendFpretFn = 3508 CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::DoubleTy, 3509 Params, 3510 true), 3511 "objc_msgSend_fpret"); 3512 3513 // id objc_msgSendSuper(struct objc_super *super, SEL op, ...) 3514 Params.clear(); 3515 Params.push_back(SuperPtrTy); 3516 Params.push_back(SelectorPtrTy); 3517 MessageSendSuperFn = 3518 CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 3519 Params, 3520 true), 3521 "objc_msgSendSuper"); 3522 3523 // void objc_msgSendSuper_stret(void * stretAddr, struct objc_super *super, 3524 // SEL op, ...) 3525 Params.clear(); 3526 Params.push_back(Int8PtrTy); 3527 Params.push_back(SuperPtrTy); 3528 Params.push_back(SelectorPtrTy); 3529 MessageSendSuperStretFn = 3530 CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::VoidTy, 3531 Params, 3532 true), 3533 "objc_msgSendSuper_stret"); 3534 3535 // There is no objc_msgSendSuper_fpret? How can that work? 3536 MessageSendSuperFpretFn = MessageSendSuperFn; 3537 3538 // FIXME: This is the size of the setjmp buffer and should be 3539 // target specific. 18 is what's used on 32-bit X86. 3540 uint64_t SetJmpBufferSize = 18; 3541 3542 // Exceptions 3543 const llvm::Type *StackPtrTy = 3544 llvm::ArrayType::get(llvm::PointerType::getUnqual(llvm::Type::Int8Ty), 4); 3545 3546 ExceptionDataTy = 3547 llvm::StructType::get(llvm::ArrayType::get(llvm::Type::Int32Ty, 3548 SetJmpBufferSize), 3549 StackPtrTy, NULL); 3550 CGM.getModule().addTypeName("struct._objc_exception_data", 3551 ExceptionDataTy); 3552 3553 Params.clear(); 3554 Params.push_back(llvm::PointerType::getUnqual(ExceptionDataTy)); 3555 ExceptionTryEnterFn = 3556 CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::VoidTy, 3557 Params, 3558 false), 3559 "objc_exception_try_enter"); 3560 ExceptionTryExitFn = 3561 CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::VoidTy, 3562 Params, 3563 false), 3564 "objc_exception_try_exit"); 3565 ExceptionExtractFn = 3566 CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 3567 Params, 3568 false), 3569 "objc_exception_extract"); 3570 3571 Params.clear(); 3572 Params.push_back(ClassPtrTy); 3573 Params.push_back(ObjectPtrTy); 3574 ExceptionMatchFn = 3575 CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::Int32Ty, 3576 Params, 3577 false), 3578 "objc_exception_match"); 3579 3580 Params.clear(); 3581 Params.push_back(llvm::PointerType::getUnqual(llvm::Type::Int32Ty)); 3582 SetJmpFn = 3583 CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::Int32Ty, 3584 Params, 3585 false), 3586 "_setjmp"); 3587 3588} 3589 3590ObjCNonFragileABITypesHelper::ObjCNonFragileABITypesHelper(CodeGen::CodeGenModule &cgm) 3591: ObjCCommonTypesHelper(cgm) 3592{ 3593 // struct _method_list_t { 3594 // uint32_t entsize; // sizeof(struct _objc_method) 3595 // uint32_t method_count; 3596 // struct _objc_method method_list[method_count]; 3597 // } 3598 MethodListnfABITy = llvm::StructType::get(IntTy, 3599 IntTy, 3600 llvm::ArrayType::get(MethodTy, 0), 3601 NULL); 3602 CGM.getModule().addTypeName("struct.__method_list_t", 3603 MethodListnfABITy); 3604 // struct method_list_t * 3605 MethodListnfABIPtrTy = llvm::PointerType::getUnqual(MethodListnfABITy); 3606 3607 // struct _protocol_t { 3608 // id isa; // NULL 3609 // const char * const protocol_name; 3610 // const struct _protocol_list_t * protocol_list; // super protocols 3611 // const struct method_list_t * const instance_methods; 3612 // const struct method_list_t * const class_methods; 3613 // const struct method_list_t *optionalInstanceMethods; 3614 // const struct method_list_t *optionalClassMethods; 3615 // const struct _prop_list_t * properties; 3616 // const uint32_t size; // sizeof(struct _protocol_t) 3617 // const uint32_t flags; // = 0 3618 // } 3619 3620 // Holder for struct _protocol_list_t * 3621 llvm::PATypeHolder ProtocolListTyHolder = llvm::OpaqueType::get(); 3622 3623 ProtocolnfABITy = llvm::StructType::get(ObjectPtrTy, 3624 Int8PtrTy, 3625 llvm::PointerType::getUnqual( 3626 ProtocolListTyHolder), 3627 MethodListnfABIPtrTy, 3628 MethodListnfABIPtrTy, 3629 MethodListnfABIPtrTy, 3630 MethodListnfABIPtrTy, 3631 PropertyListPtrTy, 3632 IntTy, 3633 IntTy, 3634 NULL); 3635 CGM.getModule().addTypeName("struct._protocol_t", 3636 ProtocolnfABITy); 3637 3638 // struct _protocol_t* 3639 ProtocolnfABIPtrTy = llvm::PointerType::getUnqual(ProtocolnfABITy); 3640 3641 // struct _protocol_list_t { 3642 // long protocol_count; // Note, this is 32/64 bit 3643 // struct _protocol_t *[protocol_count]; 3644 // } 3645 ProtocolListnfABITy = llvm::StructType::get(LongTy, 3646 llvm::ArrayType::get( 3647 ProtocolnfABIPtrTy, 0), 3648 NULL); 3649 CGM.getModule().addTypeName("struct._objc_protocol_list", 3650 ProtocolListnfABITy); 3651 cast<llvm::OpaqueType>(ProtocolListTyHolder.get())->refineAbstractTypeTo( 3652 ProtocolListnfABITy); 3653 3654 // struct _objc_protocol_list* 3655 ProtocolListnfABIPtrTy = llvm::PointerType::getUnqual(ProtocolListnfABITy); 3656 3657 // struct _ivar_t { 3658 // unsigned long int *offset; // pointer to ivar offset location 3659 // char *name; 3660 // char *type; 3661 // uint32_t alignment; 3662 // uint32_t size; 3663 // } 3664 IvarnfABITy = llvm::StructType::get(llvm::PointerType::getUnqual(LongTy), 3665 Int8PtrTy, 3666 Int8PtrTy, 3667 IntTy, 3668 IntTy, 3669 NULL); 3670 CGM.getModule().addTypeName("struct._ivar_t", IvarnfABITy); 3671 3672 // struct _ivar_list_t { 3673 // uint32 entsize; // sizeof(struct _ivar_t) 3674 // uint32 count; 3675 // struct _iver_t list[count]; 3676 // } 3677 IvarListnfABITy = llvm::StructType::get(IntTy, 3678 IntTy, 3679 llvm::ArrayType::get( 3680 IvarnfABITy, 0), 3681 NULL); 3682 CGM.getModule().addTypeName("struct._ivar_list_t", IvarListnfABITy); 3683 3684 IvarListnfABIPtrTy = llvm::PointerType::getUnqual(IvarListnfABITy); 3685 3686 // struct _class_ro_t { 3687 // uint32_t const flags; 3688 // uint32_t const instanceStart; 3689 // uint32_t const instanceSize; 3690 // uint32_t const reserved; // only when building for 64bit targets 3691 // const uint8_t * const ivarLayout; 3692 // const char *const name; 3693 // const struct _method_list_t * const baseMethods; 3694 // const struct _objc_protocol_list *const baseProtocols; 3695 // const struct _ivar_list_t *const ivars; 3696 // const uint8_t * const weakIvarLayout; 3697 // const struct _prop_list_t * const properties; 3698 // } 3699 3700 // FIXME. Add 'reserved' field in 64bit abi mode! 3701 ClassRonfABITy = llvm::StructType::get(IntTy, 3702 IntTy, 3703 IntTy, 3704 Int8PtrTy, 3705 Int8PtrTy, 3706 MethodListnfABIPtrTy, 3707 ProtocolListnfABIPtrTy, 3708 IvarListnfABIPtrTy, 3709 Int8PtrTy, 3710 PropertyListPtrTy, 3711 NULL); 3712 CGM.getModule().addTypeName("struct._class_ro_t", 3713 ClassRonfABITy); 3714 3715 // ImpnfABITy - LLVM for id (*)(id, SEL, ...) 3716 std::vector<const llvm::Type*> Params; 3717 Params.push_back(ObjectPtrTy); 3718 Params.push_back(SelectorPtrTy); 3719 ImpnfABITy = llvm::PointerType::getUnqual( 3720 llvm::FunctionType::get(ObjectPtrTy, Params, false)); 3721 3722 // struct _class_t { 3723 // struct _class_t *isa; 3724 // struct _class_t * const superclass; 3725 // void *cache; 3726 // IMP *vtable; 3727 // struct class_ro_t *ro; 3728 // } 3729 3730 llvm::PATypeHolder ClassTyHolder = llvm::OpaqueType::get(); 3731 ClassnfABITy = llvm::StructType::get(llvm::PointerType::getUnqual(ClassTyHolder), 3732 llvm::PointerType::getUnqual(ClassTyHolder), 3733 CachePtrTy, 3734 llvm::PointerType::getUnqual(ImpnfABITy), 3735 llvm::PointerType::getUnqual( 3736 ClassRonfABITy), 3737 NULL); 3738 CGM.getModule().addTypeName("struct._class_t", ClassnfABITy); 3739 3740 cast<llvm::OpaqueType>(ClassTyHolder.get())->refineAbstractTypeTo( 3741 ClassnfABITy); 3742 3743 // LLVM for struct _class_t * 3744 ClassnfABIPtrTy = llvm::PointerType::getUnqual(ClassnfABITy); 3745 3746 // struct _category_t { 3747 // const char * const name; 3748 // struct _class_t *const cls; 3749 // const struct _method_list_t * const instance_methods; 3750 // const struct _method_list_t * const class_methods; 3751 // const struct _protocol_list_t * const protocols; 3752 // const struct _prop_list_t * const properties; 3753 // } 3754 CategorynfABITy = llvm::StructType::get(Int8PtrTy, 3755 ClassnfABIPtrTy, 3756 MethodListnfABIPtrTy, 3757 MethodListnfABIPtrTy, 3758 ProtocolListnfABIPtrTy, 3759 PropertyListPtrTy, 3760 NULL); 3761 CGM.getModule().addTypeName("struct._category_t", CategorynfABITy); 3762 3763 // New types for nonfragile abi messaging. 3764 CodeGen::CodeGenTypes &Types = CGM.getTypes(); 3765 ASTContext &Ctx = CGM.getContext(); 3766 3767 // MessageRefTy - LLVM for: 3768 // struct _message_ref_t { 3769 // IMP messenger; 3770 // SEL name; 3771 // }; 3772 3773 // First the clang type for struct _message_ref_t 3774 RecordDecl *RD = RecordDecl::Create(Ctx, TagDecl::TK_struct, 0, 3775 SourceLocation(), 3776 &Ctx.Idents.get("_message_ref_t")); 3777 RD->addDecl(FieldDecl::Create(Ctx, RD, SourceLocation(), 0, 3778 Ctx.VoidPtrTy, 0, false)); 3779 RD->addDecl(FieldDecl::Create(Ctx, RD, SourceLocation(), 0, 3780 Ctx.getObjCSelType(), 0, false)); 3781 RD->completeDefinition(Ctx); 3782 3783 MessageRefCTy = Ctx.getTagDeclType(RD); 3784 MessageRefCPtrTy = Ctx.getPointerType(MessageRefCTy); 3785 MessageRefTy = cast<llvm::StructType>(Types.ConvertType(MessageRefCTy)); 3786 3787 // MessageRefPtrTy - LLVM for struct _message_ref_t* 3788 MessageRefPtrTy = llvm::PointerType::getUnqual(MessageRefTy); 3789 3790 // SuperMessageRefTy - LLVM for: 3791 // struct _super_message_ref_t { 3792 // SUPER_IMP messenger; 3793 // SEL name; 3794 // }; 3795 SuperMessageRefTy = llvm::StructType::get(ImpnfABITy, 3796 SelectorPtrTy, 3797 NULL); 3798 CGM.getModule().addTypeName("struct._super_message_ref_t", SuperMessageRefTy); 3799 3800 // SuperMessageRefPtrTy - LLVM for struct _super_message_ref_t* 3801 SuperMessageRefPtrTy = llvm::PointerType::getUnqual(SuperMessageRefTy); 3802 3803 // id objc_msgSend_fixup (id, struct message_ref_t*, ...) 3804 Params.clear(); 3805 Params.push_back(ObjectPtrTy); 3806 Params.push_back(MessageRefPtrTy); 3807 MessengerTy = llvm::FunctionType::get(ObjectPtrTy, 3808 Params, 3809 true); 3810 MessageSendFixupFn = 3811 CGM.CreateRuntimeFunction(MessengerTy, 3812 "objc_msgSend_fixup"); 3813 3814 // id objc_msgSend_fpret_fixup (id, struct message_ref_t*, ...) 3815 MessageSendFpretFixupFn = 3816 CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 3817 Params, 3818 true), 3819 "objc_msgSend_fpret_fixup"); 3820 3821 // id objc_msgSend_stret_fixup (id, struct message_ref_t*, ...) 3822 MessageSendStretFixupFn = 3823 CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 3824 Params, 3825 true), 3826 "objc_msgSend_stret_fixup"); 3827 3828 // id objc_msgSendId_fixup (id, struct message_ref_t*, ...) 3829 MessageSendIdFixupFn = 3830 CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 3831 Params, 3832 true), 3833 "objc_msgSendId_fixup"); 3834 3835 3836 // id objc_msgSendId_stret_fixup (id, struct message_ref_t*, ...) 3837 MessageSendIdStretFixupFn = 3838 CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 3839 Params, 3840 true), 3841 "objc_msgSendId_stret_fixup"); 3842 3843 // id objc_msgSendSuper2_fixup (struct objc_super *, 3844 // struct _super_message_ref_t*, ...) 3845 Params.clear(); 3846 Params.push_back(SuperPtrTy); 3847 Params.push_back(SuperMessageRefPtrTy); 3848 MessageSendSuper2FixupFn = 3849 CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 3850 Params, 3851 true), 3852 "objc_msgSendSuper2_fixup"); 3853 3854 3855 // id objc_msgSendSuper2_stret_fixup (struct objc_super *, 3856 // struct _super_message_ref_t*, ...) 3857 MessageSendSuper2StretFixupFn = 3858 CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 3859 Params, 3860 true), 3861 "objc_msgSendSuper2_stret_fixup"); 3862 3863 Params.clear(); 3864 llvm::Constant *Personality = 3865 CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::Int32Ty, 3866 Params, 3867 true), 3868 "__objc_personality_v0"); 3869 EHPersonalityPtr = llvm::ConstantExpr::getBitCast(Personality, Int8PtrTy); 3870 3871 Params.clear(); 3872 Params.push_back(Int8PtrTy); 3873 UnwindResumeOrRethrowFn = 3874 CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::VoidTy, 3875 Params, 3876 false), 3877 "_Unwind_Resume_or_Rethrow"); 3878 ObjCBeginCatchFn = 3879 CGM.CreateRuntimeFunction(llvm::FunctionType::get(Int8PtrTy, 3880 Params, 3881 false), 3882 "objc_begin_catch"); 3883 3884 Params.clear(); 3885 ObjCEndCatchFn = 3886 CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::VoidTy, 3887 Params, 3888 false), 3889 "objc_end_catch"); 3890 3891 // struct objc_typeinfo { 3892 // const void** vtable; // objc_ehtype_vtable + 2 3893 // const char* name; // c++ typeinfo string 3894 // Class cls; 3895 // }; 3896 EHTypeTy = llvm::StructType::get(llvm::PointerType::getUnqual(Int8PtrTy), 3897 Int8PtrTy, 3898 ClassnfABIPtrTy, 3899 NULL); 3900 CGM.getModule().addTypeName("struct._objc_typeinfo", EHTypeTy); 3901 EHTypePtrTy = llvm::PointerType::getUnqual(EHTypeTy); 3902} 3903 3904llvm::Function *CGObjCNonFragileABIMac::ModuleInitFunction() { 3905 FinishNonFragileABIModule(); 3906 3907 return NULL; 3908} 3909 3910void CGObjCNonFragileABIMac::FinishNonFragileABIModule() { 3911 // nonfragile abi has no module definition. 3912 3913 // Build list of all implemented classe addresses in array 3914 // L_OBJC_LABEL_CLASS_$. 3915 // FIXME. Also generate in L_OBJC_LABEL_NONLAZY_CLASS_$ 3916 // list of 'nonlazy' implementations (defined as those with a +load{} 3917 // method!!). 3918 unsigned NumClasses = DefinedClasses.size(); 3919 if (NumClasses) { 3920 std::vector<llvm::Constant*> Symbols(NumClasses); 3921 for (unsigned i=0; i<NumClasses; i++) 3922 Symbols[i] = llvm::ConstantExpr::getBitCast(DefinedClasses[i], 3923 ObjCTypes.Int8PtrTy); 3924 llvm::Constant* Init = 3925 llvm::ConstantArray::get(llvm::ArrayType::get(ObjCTypes.Int8PtrTy, 3926 NumClasses), 3927 Symbols); 3928 3929 llvm::GlobalVariable *GV = 3930 new llvm::GlobalVariable(Init->getType(), false, 3931 llvm::GlobalValue::InternalLinkage, 3932 Init, 3933 "\01L_OBJC_LABEL_CLASS_$", 3934 &CGM.getModule()); 3935 GV->setAlignment(8); 3936 GV->setSection("__DATA, __objc_classlist, regular, no_dead_strip"); 3937 UsedGlobals.push_back(GV); 3938 } 3939 3940 // Build list of all implemented category addresses in array 3941 // L_OBJC_LABEL_CATEGORY_$. 3942 // FIXME. Also generate in L_OBJC_LABEL_NONLAZY_CATEGORY_$ 3943 // list of 'nonlazy' category implementations (defined as those with a +load{} 3944 // method!!). 3945 unsigned NumCategory = DefinedCategories.size(); 3946 if (NumCategory) { 3947 std::vector<llvm::Constant*> Symbols(NumCategory); 3948 for (unsigned i=0; i<NumCategory; i++) 3949 Symbols[i] = llvm::ConstantExpr::getBitCast(DefinedCategories[i], 3950 ObjCTypes.Int8PtrTy); 3951 llvm::Constant* Init = 3952 llvm::ConstantArray::get(llvm::ArrayType::get(ObjCTypes.Int8PtrTy, 3953 NumCategory), 3954 Symbols); 3955 3956 llvm::GlobalVariable *GV = 3957 new llvm::GlobalVariable(Init->getType(), false, 3958 llvm::GlobalValue::InternalLinkage, 3959 Init, 3960 "\01L_OBJC_LABEL_CATEGORY_$", 3961 &CGM.getModule()); 3962 GV->setAlignment(8); 3963 GV->setSection("__DATA, __objc_catlist, regular, no_dead_strip"); 3964 UsedGlobals.push_back(GV); 3965 } 3966 3967 // static int L_OBJC_IMAGE_INFO[2] = { 0, flags }; 3968 // FIXME. flags can be 0 | 1 | 2 | 6. For now just use 0 3969 std::vector<llvm::Constant*> Values(2); 3970 Values[0] = llvm::ConstantInt::get(ObjCTypes.IntTy, 0); 3971 unsigned int flags = 0; 3972 // FIXME: Fix and continue? 3973 if (CGM.getLangOptions().getGCMode() != LangOptions::NonGC) 3974 flags |= eImageInfo_GarbageCollected; 3975 if (CGM.getLangOptions().getGCMode() == LangOptions::GCOnly) 3976 flags |= eImageInfo_GCOnly; 3977 Values[1] = llvm::ConstantInt::get(ObjCTypes.IntTy, flags); 3978 llvm::Constant* Init = llvm::ConstantArray::get( 3979 llvm::ArrayType::get(ObjCTypes.IntTy, 2), 3980 Values); 3981 llvm::GlobalVariable *IMGV = 3982 new llvm::GlobalVariable(Init->getType(), false, 3983 llvm::GlobalValue::InternalLinkage, 3984 Init, 3985 "\01L_OBJC_IMAGE_INFO", 3986 &CGM.getModule()); 3987 IMGV->setSection("__DATA, __objc_imageinfo, regular, no_dead_strip"); 3988 UsedGlobals.push_back(IMGV); 3989 3990 std::vector<llvm::Constant*> Used; 3991 for (std::vector<llvm::GlobalVariable*>::iterator i = UsedGlobals.begin(), 3992 e = UsedGlobals.end(); i != e; ++i) { 3993 Used.push_back(llvm::ConstantExpr::getBitCast(*i, ObjCTypes.Int8PtrTy)); 3994 } 3995 3996 llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.Int8PtrTy, Used.size()); 3997 llvm::GlobalValue *GV = 3998 new llvm::GlobalVariable(AT, false, 3999 llvm::GlobalValue::AppendingLinkage, 4000 llvm::ConstantArray::get(AT, Used), 4001 "llvm.used", 4002 &CGM.getModule()); 4003 4004 GV->setSection("llvm.metadata"); 4005 4006} 4007 4008// Metadata flags 4009enum MetaDataDlags { 4010 CLS = 0x0, 4011 CLS_META = 0x1, 4012 CLS_ROOT = 0x2, 4013 OBJC2_CLS_HIDDEN = 0x10, 4014 CLS_EXCEPTION = 0x20 4015}; 4016/// BuildClassRoTInitializer - generate meta-data for: 4017/// struct _class_ro_t { 4018/// uint32_t const flags; 4019/// uint32_t const instanceStart; 4020/// uint32_t const instanceSize; 4021/// uint32_t const reserved; // only when building for 64bit targets 4022/// const uint8_t * const ivarLayout; 4023/// const char *const name; 4024/// const struct _method_list_t * const baseMethods; 4025/// const struct _protocol_list_t *const baseProtocols; 4026/// const struct _ivar_list_t *const ivars; 4027/// const uint8_t * const weakIvarLayout; 4028/// const struct _prop_list_t * const properties; 4029/// } 4030/// 4031llvm::GlobalVariable * CGObjCNonFragileABIMac::BuildClassRoTInitializer( 4032 unsigned flags, 4033 unsigned InstanceStart, 4034 unsigned InstanceSize, 4035 const ObjCImplementationDecl *ID) { 4036 std::string ClassName = ID->getNameAsString(); 4037 std::vector<llvm::Constant*> Values(10); // 11 for 64bit targets! 4038 Values[ 0] = llvm::ConstantInt::get(ObjCTypes.IntTy, flags); 4039 Values[ 1] = llvm::ConstantInt::get(ObjCTypes.IntTy, InstanceStart); 4040 Values[ 2] = llvm::ConstantInt::get(ObjCTypes.IntTy, InstanceSize); 4041 // FIXME. For 64bit targets add 0 here. 4042 // FIXME. ivarLayout is currently null! 4043 Values[ 3] = GetIvarLayoutName(0, ObjCTypes); 4044 Values[ 4] = GetClassName(ID->getIdentifier()); 4045 // const struct _method_list_t * const baseMethods; 4046 std::vector<llvm::Constant*> Methods; 4047 std::string MethodListName("\01l_OBJC_$_"); 4048 if (flags & CLS_META) { 4049 MethodListName += "CLASS_METHODS_" + ID->getNameAsString(); 4050 for (ObjCImplementationDecl::classmeth_iterator i = ID->classmeth_begin(), 4051 e = ID->classmeth_end(); i != e; ++i) { 4052 // Class methods should always be defined. 4053 Methods.push_back(GetMethodConstant(*i)); 4054 } 4055 } else { 4056 MethodListName += "INSTANCE_METHODS_" + ID->getNameAsString(); 4057 for (ObjCImplementationDecl::instmeth_iterator i = ID->instmeth_begin(), 4058 e = ID->instmeth_end(); i != e; ++i) { 4059 // Instance methods should always be defined. 4060 Methods.push_back(GetMethodConstant(*i)); 4061 } 4062 for (ObjCImplementationDecl::propimpl_iterator i = ID->propimpl_begin(), 4063 e = ID->propimpl_end(); i != e; ++i) { 4064 ObjCPropertyImplDecl *PID = *i; 4065 4066 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize){ 4067 ObjCPropertyDecl *PD = PID->getPropertyDecl(); 4068 4069 if (ObjCMethodDecl *MD = PD->getGetterMethodDecl()) 4070 if (llvm::Constant *C = GetMethodConstant(MD)) 4071 Methods.push_back(C); 4072 if (ObjCMethodDecl *MD = PD->getSetterMethodDecl()) 4073 if (llvm::Constant *C = GetMethodConstant(MD)) 4074 Methods.push_back(C); 4075 } 4076 } 4077 } 4078 Values[ 5] = EmitMethodList(MethodListName, 4079 "__DATA, __objc_const", Methods); 4080 4081 const ObjCInterfaceDecl *OID = ID->getClassInterface(); 4082 assert(OID && "CGObjCNonFragileABIMac::BuildClassRoTInitializer"); 4083 Values[ 6] = EmitProtocolList("\01l_OBJC_CLASS_PROTOCOLS_$_" 4084 + OID->getNameAsString(), 4085 OID->protocol_begin(), 4086 OID->protocol_end()); 4087 4088 if (flags & CLS_META) 4089 Values[ 7] = llvm::Constant::getNullValue(ObjCTypes.IvarListnfABIPtrTy); 4090 else 4091 Values[ 7] = EmitIvarList(ID); 4092 // FIXME. weakIvarLayout is currently null. 4093 Values[ 8] = GetIvarLayoutName(0, ObjCTypes); 4094 if (flags & CLS_META) 4095 Values[ 9] = llvm::Constant::getNullValue(ObjCTypes.PropertyListPtrTy); 4096 else 4097 Values[ 9] = 4098 EmitPropertyList( 4099 "\01l_OBJC_$_PROP_LIST_" + ID->getNameAsString(), 4100 ID, ID->getClassInterface(), ObjCTypes); 4101 llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.ClassRonfABITy, 4102 Values); 4103 llvm::GlobalVariable *CLASS_RO_GV = 4104 new llvm::GlobalVariable(ObjCTypes.ClassRonfABITy, false, 4105 llvm::GlobalValue::InternalLinkage, 4106 Init, 4107 (flags & CLS_META) ? 4108 std::string("\01l_OBJC_METACLASS_RO_$_")+ClassName : 4109 std::string("\01l_OBJC_CLASS_RO_$_")+ClassName, 4110 &CGM.getModule()); 4111 CLASS_RO_GV->setAlignment( 4112 CGM.getTargetData().getPrefTypeAlignment(ObjCTypes.ClassRonfABITy)); 4113 CLASS_RO_GV->setSection("__DATA, __objc_const"); 4114 UsedGlobals.push_back(CLASS_RO_GV); 4115 return CLASS_RO_GV; 4116 4117} 4118 4119/// BuildClassMetaData - This routine defines that to-level meta-data 4120/// for the given ClassName for: 4121/// struct _class_t { 4122/// struct _class_t *isa; 4123/// struct _class_t * const superclass; 4124/// void *cache; 4125/// IMP *vtable; 4126/// struct class_ro_t *ro; 4127/// } 4128/// 4129llvm::GlobalVariable * CGObjCNonFragileABIMac::BuildClassMetaData( 4130 std::string &ClassName, 4131 llvm::Constant *IsAGV, 4132 llvm::Constant *SuperClassGV, 4133 llvm::Constant *ClassRoGV, 4134 bool HiddenVisibility) { 4135 std::vector<llvm::Constant*> Values(5); 4136 Values[0] = IsAGV; 4137 Values[1] = SuperClassGV 4138 ? SuperClassGV 4139 : llvm::Constant::getNullValue(ObjCTypes.ClassnfABIPtrTy); 4140 Values[2] = ObjCEmptyCacheVar; // &ObjCEmptyCacheVar 4141 Values[3] = ObjCEmptyVtableVar; // &ObjCEmptyVtableVar 4142 Values[4] = ClassRoGV; // &CLASS_RO_GV 4143 llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.ClassnfABITy, 4144 Values); 4145 llvm::GlobalVariable *GV = GetClassGlobal(ClassName); 4146 GV->setInitializer(Init); 4147 GV->setSection("__DATA, __objc_data"); 4148 GV->setAlignment( 4149 CGM.getTargetData().getPrefTypeAlignment(ObjCTypes.ClassnfABITy)); 4150 if (HiddenVisibility) 4151 GV->setVisibility(llvm::GlobalValue::HiddenVisibility); 4152 UsedGlobals.push_back(GV); 4153 return GV; 4154} 4155 4156void CGObjCNonFragileABIMac::GenerateClass(const ObjCImplementationDecl *ID) { 4157 std::string ClassName = ID->getNameAsString(); 4158 if (!ObjCEmptyCacheVar) { 4159 ObjCEmptyCacheVar = new llvm::GlobalVariable( 4160 ObjCTypes.CacheTy, 4161 false, 4162 llvm::GlobalValue::ExternalLinkage, 4163 0, 4164 "\01__objc_empty_cache", 4165 &CGM.getModule()); 4166 UsedGlobals.push_back(ObjCEmptyCacheVar); 4167 4168 ObjCEmptyVtableVar = new llvm::GlobalVariable( 4169 ObjCTypes.ImpnfABITy, 4170 false, 4171 llvm::GlobalValue::ExternalLinkage, 4172 0, 4173 "\01__objc_empty_vtable", 4174 &CGM.getModule()); 4175 UsedGlobals.push_back(ObjCEmptyVtableVar); 4176 } 4177 assert(ID->getClassInterface() && 4178 "CGObjCNonFragileABIMac::GenerateClass - class is 0"); 4179 uint32_t InstanceStart = 4180 CGM.getTargetData().getTypePaddedSize(ObjCTypes.ClassnfABITy); 4181 uint32_t InstanceSize = InstanceStart; 4182 uint32_t flags = CLS_META; 4183 std::string ObjCMetaClassName("\01_OBJC_METACLASS_$_"); 4184 std::string ObjCClassName("\01_OBJC_CLASS_$_"); 4185 4186 llvm::GlobalVariable *SuperClassGV, *IsAGV; 4187 4188 bool classIsHidden = IsClassHidden(ID->getClassInterface()); 4189 if (classIsHidden) 4190 flags |= OBJC2_CLS_HIDDEN; 4191 if (!ID->getClassInterface()->getSuperClass()) { 4192 // class is root 4193 flags |= CLS_ROOT; 4194 SuperClassGV = GetClassGlobal(ObjCClassName + ClassName); 4195 IsAGV = GetClassGlobal(ObjCMetaClassName + ClassName); 4196 } else { 4197 // Has a root. Current class is not a root. 4198 const ObjCInterfaceDecl *Root = ID->getClassInterface(); 4199 while (const ObjCInterfaceDecl *Super = Root->getSuperClass()) 4200 Root = Super; 4201 IsAGV = GetClassGlobal(ObjCMetaClassName + Root->getNameAsString()); 4202 // work on super class metadata symbol. 4203 std::string SuperClassName = 4204 ObjCMetaClassName + ID->getClassInterface()->getSuperClass()->getNameAsString(); 4205 SuperClassGV = GetClassGlobal(SuperClassName); 4206 } 4207 llvm::GlobalVariable *CLASS_RO_GV = BuildClassRoTInitializer(flags, 4208 InstanceStart, 4209 InstanceSize,ID); 4210 std::string TClassName = ObjCMetaClassName + ClassName; 4211 llvm::GlobalVariable *MetaTClass = 4212 BuildClassMetaData(TClassName, IsAGV, SuperClassGV, CLASS_RO_GV, 4213 classIsHidden); 4214 4215 // Metadata for the class 4216 flags = CLS; 4217 if (classIsHidden) 4218 flags |= OBJC2_CLS_HIDDEN; 4219 if (!ID->getClassInterface()->getSuperClass()) { 4220 flags |= CLS_ROOT; 4221 SuperClassGV = 0; 4222 } 4223 else { 4224 // Has a root. Current class is not a root. 4225 std::string RootClassName = 4226 ID->getClassInterface()->getSuperClass()->getNameAsString(); 4227 SuperClassGV = GetClassGlobal(ObjCClassName + RootClassName); 4228 } 4229 // FIXME: Gross 4230 ObjCInterfaceDecl *Interface = 4231 const_cast<ObjCInterfaceDecl*>(ID->getClassInterface()); 4232 CGM.getTypes().ConvertType(CGM.getContext().buildObjCInterfaceType(Interface)); 4233 InstanceStart = InstanceSize = 0; 4234 if (ObjCInterfaceDecl *OID = 4235 const_cast<ObjCInterfaceDecl*>(ID->getClassInterface())) { 4236 // FIXME. Share this with the one in EmitIvarList. 4237 const llvm::StructLayout *Layout = GetInterfaceDeclStructLayout(OID); 4238 4239 RecordDecl::field_iterator firstField, lastField; 4240 const RecordDecl *RD = GetFirstIvarInRecord(OID, firstField, lastField); 4241 4242 for (RecordDecl::field_iterator e = RD->field_end(), 4243 ifield = firstField; ifield != e; ++ifield) 4244 lastField = ifield; 4245 4246 if (lastField != RD->field_end()) { 4247 FieldDecl *Field = *lastField; 4248 const llvm::Type *FieldTy = 4249 CGM.getTypes().ConvertTypeForMem(Field->getType()); 4250 unsigned Size = CGM.getTargetData().getTypePaddedSize(FieldTy); 4251 InstanceSize = GetIvarBaseOffset(Layout, Field) + Size; 4252 if (firstField == RD->field_end()) 4253 InstanceStart = InstanceSize; 4254 else { 4255 Field = *firstField; 4256 InstanceStart = GetIvarBaseOffset(Layout, Field); 4257 } 4258 } 4259 } 4260 CLASS_RO_GV = BuildClassRoTInitializer(flags, 4261 InstanceStart, 4262 InstanceSize, 4263 ID); 4264 4265 TClassName = ObjCClassName + ClassName; 4266 llvm::GlobalVariable *ClassMD = 4267 BuildClassMetaData(TClassName, MetaTClass, SuperClassGV, CLASS_RO_GV, 4268 classIsHidden); 4269 DefinedClasses.push_back(ClassMD); 4270} 4271 4272/// GenerateProtocolRef - This routine is called to generate code for 4273/// a protocol reference expression; as in: 4274/// @code 4275/// @protocol(Proto1); 4276/// @endcode 4277/// It generates a weak reference to l_OBJC_PROTOCOL_REFERENCE_$_Proto1 4278/// which will hold address of the protocol meta-data. 4279/// 4280llvm::Value *CGObjCNonFragileABIMac::GenerateProtocolRef(CGBuilderTy &Builder, 4281 const ObjCProtocolDecl *PD) { 4282 4283 llvm::Constant *Init = llvm::ConstantExpr::getBitCast(GetProtocolRef(PD), 4284 ObjCTypes.ExternalProtocolPtrTy); 4285 4286 std::string ProtocolName("\01l_OBJC_PROTOCOL_REFERENCE_$_"); 4287 ProtocolName += PD->getNameAsCString(); 4288 4289 llvm::GlobalVariable *PTGV = CGM.getModule().getGlobalVariable(ProtocolName); 4290 if (PTGV) 4291 return Builder.CreateLoad(PTGV, false, "tmp"); 4292 PTGV = new llvm::GlobalVariable( 4293 Init->getType(), false, 4294 llvm::GlobalValue::WeakAnyLinkage, 4295 Init, 4296 ProtocolName, 4297 &CGM.getModule()); 4298 PTGV->setSection("__DATA, __objc_protorefs, coalesced, no_dead_strip"); 4299 PTGV->setVisibility(llvm::GlobalValue::HiddenVisibility); 4300 UsedGlobals.push_back(PTGV); 4301 return Builder.CreateLoad(PTGV, false, "tmp"); 4302} 4303 4304/// GenerateCategory - Build metadata for a category implementation. 4305/// struct _category_t { 4306/// const char * const name; 4307/// struct _class_t *const cls; 4308/// const struct _method_list_t * const instance_methods; 4309/// const struct _method_list_t * const class_methods; 4310/// const struct _protocol_list_t * const protocols; 4311/// const struct _prop_list_t * const properties; 4312/// } 4313/// 4314void CGObjCNonFragileABIMac::GenerateCategory(const ObjCCategoryImplDecl *OCD) 4315{ 4316 const ObjCInterfaceDecl *Interface = OCD->getClassInterface(); 4317 const char *Prefix = "\01l_OBJC_$_CATEGORY_"; 4318 std::string ExtCatName(Prefix + Interface->getNameAsString()+ 4319 "_$_" + OCD->getNameAsString()); 4320 std::string ExtClassName("\01_OBJC_CLASS_$_" + Interface->getNameAsString()); 4321 4322 std::vector<llvm::Constant*> Values(6); 4323 Values[0] = GetClassName(OCD->getIdentifier()); 4324 // meta-class entry symbol 4325 llvm::GlobalVariable *ClassGV = GetClassGlobal(ExtClassName); 4326 Values[1] = ClassGV; 4327 std::vector<llvm::Constant*> Methods; 4328 std::string MethodListName(Prefix); 4329 MethodListName += "INSTANCE_METHODS_" + Interface->getNameAsString() + 4330 "_$_" + OCD->getNameAsString(); 4331 4332 for (ObjCCategoryImplDecl::instmeth_iterator i = OCD->instmeth_begin(), 4333 e = OCD->instmeth_end(); i != e; ++i) { 4334 // Instance methods should always be defined. 4335 Methods.push_back(GetMethodConstant(*i)); 4336 } 4337 4338 Values[2] = EmitMethodList(MethodListName, 4339 "__DATA, __objc_const", 4340 Methods); 4341 4342 MethodListName = Prefix; 4343 MethodListName += "CLASS_METHODS_" + Interface->getNameAsString() + "_$_" + 4344 OCD->getNameAsString(); 4345 Methods.clear(); 4346 for (ObjCCategoryImplDecl::classmeth_iterator i = OCD->classmeth_begin(), 4347 e = OCD->classmeth_end(); i != e; ++i) { 4348 // Class methods should always be defined. 4349 Methods.push_back(GetMethodConstant(*i)); 4350 } 4351 4352 Values[3] = EmitMethodList(MethodListName, 4353 "__DATA, __objc_const", 4354 Methods); 4355 const ObjCCategoryDecl *Category = 4356 Interface->FindCategoryDeclaration(OCD->getIdentifier()); 4357 if (Category) { 4358 std::string ExtName(Interface->getNameAsString() + "_$_" + 4359 OCD->getNameAsString()); 4360 Values[4] = EmitProtocolList("\01l_OBJC_CATEGORY_PROTOCOLS_$_" 4361 + Interface->getNameAsString() + "_$_" 4362 + Category->getNameAsString(), 4363 Category->protocol_begin(), 4364 Category->protocol_end()); 4365 Values[5] = 4366 EmitPropertyList(std::string("\01l_OBJC_$_PROP_LIST_") + ExtName, 4367 OCD, Category, ObjCTypes); 4368 } 4369 else { 4370 Values[4] = llvm::Constant::getNullValue(ObjCTypes.ProtocolListnfABIPtrTy); 4371 Values[5] = llvm::Constant::getNullValue(ObjCTypes.PropertyListPtrTy); 4372 } 4373 4374 llvm::Constant *Init = 4375 llvm::ConstantStruct::get(ObjCTypes.CategorynfABITy, 4376 Values); 4377 llvm::GlobalVariable *GCATV 4378 = new llvm::GlobalVariable(ObjCTypes.CategorynfABITy, 4379 false, 4380 llvm::GlobalValue::InternalLinkage, 4381 Init, 4382 ExtCatName, 4383 &CGM.getModule()); 4384 GCATV->setAlignment( 4385 CGM.getTargetData().getPrefTypeAlignment(ObjCTypes.CategorynfABITy)); 4386 GCATV->setSection("__DATA, __objc_const"); 4387 UsedGlobals.push_back(GCATV); 4388 DefinedCategories.push_back(GCATV); 4389} 4390 4391/// GetMethodConstant - Return a struct objc_method constant for the 4392/// given method if it has been defined. The result is null if the 4393/// method has not been defined. The return value has type MethodPtrTy. 4394llvm::Constant *CGObjCNonFragileABIMac::GetMethodConstant( 4395 const ObjCMethodDecl *MD) { 4396 // FIXME: Use DenseMap::lookup 4397 llvm::Function *Fn = MethodDefinitions[MD]; 4398 if (!Fn) 4399 return 0; 4400 4401 std::vector<llvm::Constant*> Method(3); 4402 Method[0] = 4403 llvm::ConstantExpr::getBitCast(GetMethodVarName(MD->getSelector()), 4404 ObjCTypes.SelectorPtrTy); 4405 Method[1] = GetMethodVarType(MD); 4406 Method[2] = llvm::ConstantExpr::getBitCast(Fn, ObjCTypes.Int8PtrTy); 4407 return llvm::ConstantStruct::get(ObjCTypes.MethodTy, Method); 4408} 4409 4410/// EmitMethodList - Build meta-data for method declarations 4411/// struct _method_list_t { 4412/// uint32_t entsize; // sizeof(struct _objc_method) 4413/// uint32_t method_count; 4414/// struct _objc_method method_list[method_count]; 4415/// } 4416/// 4417llvm::Constant *CGObjCNonFragileABIMac::EmitMethodList( 4418 const std::string &Name, 4419 const char *Section, 4420 const ConstantVector &Methods) { 4421 // Return null for empty list. 4422 if (Methods.empty()) 4423 return llvm::Constant::getNullValue(ObjCTypes.MethodListnfABIPtrTy); 4424 4425 std::vector<llvm::Constant*> Values(3); 4426 // sizeof(struct _objc_method) 4427 unsigned Size = CGM.getTargetData().getTypePaddedSize(ObjCTypes.MethodTy); 4428 Values[0] = llvm::ConstantInt::get(ObjCTypes.IntTy, Size); 4429 // method_count 4430 Values[1] = llvm::ConstantInt::get(ObjCTypes.IntTy, Methods.size()); 4431 llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.MethodTy, 4432 Methods.size()); 4433 Values[2] = llvm::ConstantArray::get(AT, Methods); 4434 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 4435 4436 llvm::GlobalVariable *GV = 4437 new llvm::GlobalVariable(Init->getType(), false, 4438 llvm::GlobalValue::InternalLinkage, 4439 Init, 4440 Name, 4441 &CGM.getModule()); 4442 GV->setAlignment( 4443 CGM.getTargetData().getPrefTypeAlignment(Init->getType())); 4444 GV->setSection(Section); 4445 UsedGlobals.push_back(GV); 4446 return llvm::ConstantExpr::getBitCast(GV, 4447 ObjCTypes.MethodListnfABIPtrTy); 4448} 4449 4450/// ObjCIvarOffsetVariable - Returns the ivar offset variable for 4451/// the given ivar. 4452/// 4453llvm::GlobalVariable * CGObjCNonFragileABIMac::ObjCIvarOffsetVariable( 4454 std::string &Name, 4455 const ObjCInterfaceDecl *ID, 4456 const ObjCIvarDecl *Ivar) { 4457 Name += "\01_OBJC_IVAR_$_" + 4458 getInterfaceDeclForIvar(ID, Ivar)->getNameAsString() + '.' 4459 + Ivar->getNameAsString(); 4460 llvm::GlobalVariable *IvarOffsetGV = 4461 CGM.getModule().getGlobalVariable(Name); 4462 if (!IvarOffsetGV) 4463 IvarOffsetGV = 4464 new llvm::GlobalVariable(ObjCTypes.LongTy, 4465 false, 4466 llvm::GlobalValue::ExternalLinkage, 4467 0, 4468 Name, 4469 &CGM.getModule()); 4470 return IvarOffsetGV; 4471} 4472 4473llvm::Constant * CGObjCNonFragileABIMac::EmitIvarOffsetVar( 4474 const ObjCInterfaceDecl *ID, 4475 const ObjCIvarDecl *Ivar, 4476 unsigned long int Offset) { 4477 4478 assert(ID && "EmitIvarOffsetVar - null interface decl."); 4479 std::string ExternalName("\01_OBJC_IVAR_$_" + ID->getNameAsString() + '.' 4480 + Ivar->getNameAsString()); 4481 llvm::Constant *Init = llvm::ConstantInt::get(ObjCTypes.LongTy, Offset); 4482 4483 llvm::GlobalVariable *IvarOffsetGV = 4484 CGM.getModule().getGlobalVariable(ExternalName); 4485 if (IvarOffsetGV) { 4486 // ivar offset symbol already built due to user code referencing it. 4487 IvarOffsetGV->setAlignment( 4488 CGM.getTargetData().getPrefTypeAlignment(ObjCTypes.LongTy)); 4489 IvarOffsetGV->setInitializer(Init); 4490 IvarOffsetGV->setSection("__DATA, __objc_const"); 4491 UsedGlobals.push_back(IvarOffsetGV); 4492 return IvarOffsetGV; 4493 } 4494 4495 IvarOffsetGV = 4496 new llvm::GlobalVariable(Init->getType(), 4497 false, 4498 llvm::GlobalValue::ExternalLinkage, 4499 Init, 4500 ExternalName, 4501 &CGM.getModule()); 4502 IvarOffsetGV->setAlignment( 4503 CGM.getTargetData().getPrefTypeAlignment(ObjCTypes.LongTy)); 4504 // @private and @package have hidden visibility. 4505 bool globalVisibility = (Ivar->getAccessControl() == ObjCIvarDecl::Public || 4506 Ivar->getAccessControl() == ObjCIvarDecl::Protected); 4507 if (!globalVisibility) 4508 IvarOffsetGV->setVisibility(llvm::GlobalValue::HiddenVisibility); 4509 else 4510 if (IsClassHidden(ID)) 4511 IvarOffsetGV->setVisibility(llvm::GlobalValue::HiddenVisibility); 4512 4513 IvarOffsetGV->setSection("__DATA, __objc_const"); 4514 UsedGlobals.push_back(IvarOffsetGV); 4515 return IvarOffsetGV; 4516} 4517 4518/// EmitIvarList - Emit the ivar list for the given 4519/// implementation. If ForClass is true the list of class ivars 4520/// (i.e. metaclass ivars) is emitted, otherwise the list of 4521/// interface ivars will be emitted. The return value has type 4522/// IvarListnfABIPtrTy. 4523/// struct _ivar_t { 4524/// unsigned long int *offset; // pointer to ivar offset location 4525/// char *name; 4526/// char *type; 4527/// uint32_t alignment; 4528/// uint32_t size; 4529/// } 4530/// struct _ivar_list_t { 4531/// uint32 entsize; // sizeof(struct _ivar_t) 4532/// uint32 count; 4533/// struct _iver_t list[count]; 4534/// } 4535/// 4536llvm::Constant *CGObjCNonFragileABIMac::EmitIvarList( 4537 const ObjCImplementationDecl *ID) { 4538 4539 std::vector<llvm::Constant*> Ivars, Ivar(5); 4540 4541 const ObjCInterfaceDecl *OID = ID->getClassInterface(); 4542 assert(OID && "CGObjCNonFragileABIMac::EmitIvarList - null interface"); 4543 4544 // FIXME. Consolidate this with similar code in GenerateClass. 4545 const llvm::StructLayout *Layout = GetInterfaceDeclStructLayout(OID); 4546 4547 RecordDecl::field_iterator i,p; 4548 const RecordDecl *RD = GetFirstIvarInRecord(OID, i,p); 4549 ObjCInterfaceDecl::ivar_iterator I = OID->ivar_begin(); 4550 4551 for (RecordDecl::field_iterator e = RD->field_end(); i != e; ++i) { 4552 FieldDecl *Field = *i; 4553 uint64_t offset = GetIvarBaseOffset(Layout, Field); 4554 const ObjCIvarDecl *ivarDecl = *I++; 4555 Ivar[0] = EmitIvarOffsetVar(ID->getClassInterface(), ivarDecl, offset); 4556 if (Field->getIdentifier()) 4557 Ivar[1] = GetMethodVarName(Field->getIdentifier()); 4558 else 4559 Ivar[1] = llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy); 4560 Ivar[2] = GetMethodVarType(Field); 4561 const llvm::Type *FieldTy = 4562 CGM.getTypes().ConvertTypeForMem(Field->getType()); 4563 unsigned Size = CGM.getTargetData().getTypePaddedSize(FieldTy); 4564 unsigned Align = CGM.getContext().getPreferredTypeAlign( 4565 Field->getType().getTypePtr()) >> 3; 4566 Align = llvm::Log2_32(Align); 4567 Ivar[3] = llvm::ConstantInt::get(ObjCTypes.IntTy, Align); 4568 // NOTE. Size of a bitfield does not match gcc's, because of the way 4569 // bitfields are treated special in each. But I am told that 'size' 4570 // for bitfield ivars is ignored by the runtime so it does not matter. 4571 // (even if it matters, some day, there is enough info. to get the bitfield 4572 // right! 4573 Ivar[4] = llvm::ConstantInt::get(ObjCTypes.IntTy, Size); 4574 Ivars.push_back(llvm::ConstantStruct::get(ObjCTypes.IvarnfABITy, Ivar)); 4575 } 4576 // Return null for empty list. 4577 if (Ivars.empty()) 4578 return llvm::Constant::getNullValue(ObjCTypes.IvarListnfABIPtrTy); 4579 std::vector<llvm::Constant*> Values(3); 4580 unsigned Size = CGM.getTargetData().getTypePaddedSize(ObjCTypes.IvarnfABITy); 4581 Values[0] = llvm::ConstantInt::get(ObjCTypes.IntTy, Size); 4582 Values[1] = llvm::ConstantInt::get(ObjCTypes.IntTy, Ivars.size()); 4583 llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.IvarnfABITy, 4584 Ivars.size()); 4585 Values[2] = llvm::ConstantArray::get(AT, Ivars); 4586 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 4587 const char *Prefix = "\01l_OBJC_$_INSTANCE_VARIABLES_"; 4588 llvm::GlobalVariable *GV = 4589 new llvm::GlobalVariable(Init->getType(), false, 4590 llvm::GlobalValue::InternalLinkage, 4591 Init, 4592 Prefix + OID->getNameAsString(), 4593 &CGM.getModule()); 4594 GV->setAlignment( 4595 CGM.getTargetData().getPrefTypeAlignment(Init->getType())); 4596 GV->setSection("__DATA, __objc_const"); 4597 4598 UsedGlobals.push_back(GV); 4599 return llvm::ConstantExpr::getBitCast(GV, 4600 ObjCTypes.IvarListnfABIPtrTy); 4601} 4602 4603llvm::Constant *CGObjCNonFragileABIMac::GetOrEmitProtocolRef( 4604 const ObjCProtocolDecl *PD) { 4605 llvm::GlobalVariable *&Entry = Protocols[PD->getIdentifier()]; 4606 4607 if (!Entry) { 4608 // We use the initializer as a marker of whether this is a forward 4609 // reference or not. At module finalization we add the empty 4610 // contents for protocols which were referenced but never defined. 4611 Entry = 4612 new llvm::GlobalVariable(ObjCTypes.ProtocolnfABITy, false, 4613 llvm::GlobalValue::ExternalLinkage, 4614 0, 4615 "\01l_OBJC_PROTOCOL_$_" + PD->getNameAsString(), 4616 &CGM.getModule()); 4617 Entry->setSection("__DATA,__datacoal_nt,coalesced"); 4618 UsedGlobals.push_back(Entry); 4619 } 4620 4621 return Entry; 4622} 4623 4624/// GetOrEmitProtocol - Generate the protocol meta-data: 4625/// @code 4626/// struct _protocol_t { 4627/// id isa; // NULL 4628/// const char * const protocol_name; 4629/// const struct _protocol_list_t * protocol_list; // super protocols 4630/// const struct method_list_t * const instance_methods; 4631/// const struct method_list_t * const class_methods; 4632/// const struct method_list_t *optionalInstanceMethods; 4633/// const struct method_list_t *optionalClassMethods; 4634/// const struct _prop_list_t * properties; 4635/// const uint32_t size; // sizeof(struct _protocol_t) 4636/// const uint32_t flags; // = 0 4637/// } 4638/// @endcode 4639/// 4640 4641llvm::Constant *CGObjCNonFragileABIMac::GetOrEmitProtocol( 4642 const ObjCProtocolDecl *PD) { 4643 llvm::GlobalVariable *&Entry = Protocols[PD->getIdentifier()]; 4644 4645 // Early exit if a defining object has already been generated. 4646 if (Entry && Entry->hasInitializer()) 4647 return Entry; 4648 4649 const char *ProtocolName = PD->getNameAsCString(); 4650 4651 // Construct method lists. 4652 std::vector<llvm::Constant*> InstanceMethods, ClassMethods; 4653 std::vector<llvm::Constant*> OptInstanceMethods, OptClassMethods; 4654 for (ObjCProtocolDecl::instmeth_iterator i = PD->instmeth_begin(), 4655 e = PD->instmeth_end(); i != e; ++i) { 4656 ObjCMethodDecl *MD = *i; 4657 llvm::Constant *C = GetMethodDescriptionConstant(MD); 4658 if (MD->getImplementationControl() == ObjCMethodDecl::Optional) { 4659 OptInstanceMethods.push_back(C); 4660 } else { 4661 InstanceMethods.push_back(C); 4662 } 4663 } 4664 4665 for (ObjCProtocolDecl::classmeth_iterator i = PD->classmeth_begin(), 4666 e = PD->classmeth_end(); i != e; ++i) { 4667 ObjCMethodDecl *MD = *i; 4668 llvm::Constant *C = GetMethodDescriptionConstant(MD); 4669 if (MD->getImplementationControl() == ObjCMethodDecl::Optional) { 4670 OptClassMethods.push_back(C); 4671 } else { 4672 ClassMethods.push_back(C); 4673 } 4674 } 4675 4676 std::vector<llvm::Constant*> Values(10); 4677 // isa is NULL 4678 Values[0] = llvm::Constant::getNullValue(ObjCTypes.ObjectPtrTy); 4679 Values[1] = GetClassName(PD->getIdentifier()); 4680 Values[2] = EmitProtocolList( 4681 "\01l_OBJC_$_PROTOCOL_REFS_" + PD->getNameAsString(), 4682 PD->protocol_begin(), 4683 PD->protocol_end()); 4684 4685 Values[3] = EmitMethodList("\01l_OBJC_$_PROTOCOL_INSTANCE_METHODS_" 4686 + PD->getNameAsString(), 4687 "__DATA, __objc_const", 4688 InstanceMethods); 4689 Values[4] = EmitMethodList("\01l_OBJC_$_PROTOCOL_CLASS_METHODS_" 4690 + PD->getNameAsString(), 4691 "__DATA, __objc_const", 4692 ClassMethods); 4693 Values[5] = EmitMethodList("\01l_OBJC_$_PROTOCOL_INSTANCE_METHODS_OPT_" 4694 + PD->getNameAsString(), 4695 "__DATA, __objc_const", 4696 OptInstanceMethods); 4697 Values[6] = EmitMethodList("\01l_OBJC_$_PROTOCOL_CLASS_METHODS_OPT_" 4698 + PD->getNameAsString(), 4699 "__DATA, __objc_const", 4700 OptClassMethods); 4701 Values[7] = EmitPropertyList("\01l_OBJC_$_PROP_LIST_" + PD->getNameAsString(), 4702 0, PD, ObjCTypes); 4703 uint32_t Size = 4704 CGM.getTargetData().getTypePaddedSize(ObjCTypes.ProtocolnfABITy); 4705 Values[8] = llvm::ConstantInt::get(ObjCTypes.IntTy, Size); 4706 Values[9] = llvm::Constant::getNullValue(ObjCTypes.IntTy); 4707 llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.ProtocolnfABITy, 4708 Values); 4709 4710 if (Entry) { 4711 // Already created, fix the linkage and update the initializer. 4712 Entry->setLinkage(llvm::GlobalValue::WeakAnyLinkage); 4713 Entry->setInitializer(Init); 4714 } else { 4715 Entry = 4716 new llvm::GlobalVariable(ObjCTypes.ProtocolnfABITy, false, 4717 llvm::GlobalValue::WeakAnyLinkage, 4718 Init, 4719 std::string("\01l_OBJC_PROTOCOL_$_")+ProtocolName, 4720 &CGM.getModule()); 4721 Entry->setAlignment( 4722 CGM.getTargetData().getPrefTypeAlignment(ObjCTypes.ProtocolnfABITy)); 4723 Entry->setSection("__DATA,__datacoal_nt,coalesced"); 4724 } 4725 Entry->setVisibility(llvm::GlobalValue::HiddenVisibility); 4726 4727 // Use this protocol meta-data to build protocol list table in section 4728 // __DATA, __objc_protolist 4729 llvm::GlobalVariable *PTGV = new llvm::GlobalVariable( 4730 ObjCTypes.ProtocolnfABIPtrTy, false, 4731 llvm::GlobalValue::WeakAnyLinkage, 4732 Entry, 4733 std::string("\01l_OBJC_LABEL_PROTOCOL_$_") 4734 +ProtocolName, 4735 &CGM.getModule()); 4736 PTGV->setAlignment( 4737 CGM.getTargetData().getPrefTypeAlignment(ObjCTypes.ProtocolnfABIPtrTy)); 4738 PTGV->setSection("__DATA, __objc_protolist"); 4739 PTGV->setVisibility(llvm::GlobalValue::HiddenVisibility); 4740 UsedGlobals.push_back(PTGV); 4741 return Entry; 4742} 4743 4744/// EmitProtocolList - Generate protocol list meta-data: 4745/// @code 4746/// struct _protocol_list_t { 4747/// long protocol_count; // Note, this is 32/64 bit 4748/// struct _protocol_t[protocol_count]; 4749/// } 4750/// @endcode 4751/// 4752llvm::Constant * 4753CGObjCNonFragileABIMac::EmitProtocolList(const std::string &Name, 4754 ObjCProtocolDecl::protocol_iterator begin, 4755 ObjCProtocolDecl::protocol_iterator end) { 4756 std::vector<llvm::Constant*> ProtocolRefs; 4757 4758 // Just return null for empty protocol lists 4759 if (begin == end) 4760 return llvm::Constant::getNullValue(ObjCTypes.ProtocolListnfABIPtrTy); 4761 4762 // FIXME: We shouldn't need to do this lookup here, should we? 4763 llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name, true); 4764 if (GV) 4765 return llvm::ConstantExpr::getBitCast(GV, 4766 ObjCTypes.ProtocolListnfABIPtrTy); 4767 4768 for (; begin != end; ++begin) 4769 ProtocolRefs.push_back(GetProtocolRef(*begin)); // Implemented??? 4770 4771 // This list is null terminated. 4772 ProtocolRefs.push_back(llvm::Constant::getNullValue( 4773 ObjCTypes.ProtocolnfABIPtrTy)); 4774 4775 std::vector<llvm::Constant*> Values(2); 4776 Values[0] = llvm::ConstantInt::get(ObjCTypes.LongTy, ProtocolRefs.size() - 1); 4777 Values[1] = 4778 llvm::ConstantArray::get(llvm::ArrayType::get(ObjCTypes.ProtocolnfABIPtrTy, 4779 ProtocolRefs.size()), 4780 ProtocolRefs); 4781 4782 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 4783 GV = new llvm::GlobalVariable(Init->getType(), false, 4784 llvm::GlobalValue::InternalLinkage, 4785 Init, 4786 Name, 4787 &CGM.getModule()); 4788 GV->setSection("__DATA, __objc_const"); 4789 GV->setAlignment( 4790 CGM.getTargetData().getPrefTypeAlignment(Init->getType())); 4791 UsedGlobals.push_back(GV); 4792 return llvm::ConstantExpr::getBitCast(GV, 4793 ObjCTypes.ProtocolListnfABIPtrTy); 4794} 4795 4796/// GetMethodDescriptionConstant - This routine build following meta-data: 4797/// struct _objc_method { 4798/// SEL _cmd; 4799/// char *method_type; 4800/// char *_imp; 4801/// } 4802 4803llvm::Constant * 4804CGObjCNonFragileABIMac::GetMethodDescriptionConstant(const ObjCMethodDecl *MD) { 4805 std::vector<llvm::Constant*> Desc(3); 4806 Desc[0] = llvm::ConstantExpr::getBitCast(GetMethodVarName(MD->getSelector()), 4807 ObjCTypes.SelectorPtrTy); 4808 Desc[1] = GetMethodVarType(MD); 4809 // Protocol methods have no implementation. So, this entry is always NULL. 4810 Desc[2] = llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy); 4811 return llvm::ConstantStruct::get(ObjCTypes.MethodTy, Desc); 4812} 4813 4814/// EmitObjCValueForIvar - Code Gen for nonfragile ivar reference. 4815/// This code gen. amounts to generating code for: 4816/// @code 4817/// (type *)((char *)base + _OBJC_IVAR_$_.ivar; 4818/// @encode 4819/// 4820LValue CGObjCNonFragileABIMac::EmitObjCValueForIvar( 4821 CodeGen::CodeGenFunction &CGF, 4822 QualType ObjectTy, 4823 llvm::Value *BaseValue, 4824 const ObjCIvarDecl *Ivar, 4825 const FieldDecl *Field, 4826 unsigned CVRQualifiers) { 4827 assert(ObjectTy->isObjCInterfaceType() && 4828 "CGObjCNonFragileABIMac::EmitObjCValueForIvar"); 4829 ObjCInterfaceDecl *ID = ObjectTy->getAsObjCInterfaceType()->getDecl(); 4830 std::string ExternalName; 4831 llvm::GlobalVariable *IvarOffsetGV = 4832 ObjCIvarOffsetVariable(ExternalName, ID, Ivar); 4833 4834 // (char *) BaseValue 4835 llvm::Value *V = CGF.Builder.CreateBitCast(BaseValue, 4836 ObjCTypes.Int8PtrTy); 4837 llvm::Value *Offset = CGF.Builder.CreateLoad(IvarOffsetGV); 4838 // (char*)BaseValue + Offset_symbol 4839 V = CGF.Builder.CreateGEP(V, Offset, "add.ptr"); 4840 // (type *)((char*)BaseValue + Offset_symbol) 4841 const llvm::Type *IvarTy = 4842 CGM.getTypes().ConvertType(Ivar->getType()); 4843 llvm::Type *ptrIvarTy = llvm::PointerType::getUnqual(IvarTy); 4844 V = CGF.Builder.CreateBitCast(V, ptrIvarTy); 4845 4846 if (Ivar->isBitField()) { 4847 CodeGenTypes::BitFieldInfo bitFieldInfo = 4848 CGM.getTypes().getBitFieldInfo(Field); 4849 return LValue::MakeBitfield(V, bitFieldInfo.Begin, bitFieldInfo.Size, 4850 Field->getType()->isSignedIntegerType(), 4851 Field->getType().getCVRQualifiers()|CVRQualifiers); 4852 } 4853 4854 LValue LV = LValue::MakeAddr(V, 4855 Ivar->getType().getCVRQualifiers()|CVRQualifiers, 4856 CGM.getContext().getObjCGCAttrKind(Ivar->getType())); 4857 LValue::SetObjCIvar(LV, true); 4858 return LV; 4859} 4860 4861llvm::Value *CGObjCNonFragileABIMac::EmitIvarOffset( 4862 CodeGen::CodeGenFunction &CGF, 4863 ObjCInterfaceDecl *Interface, 4864 const ObjCIvarDecl *Ivar) { 4865 std::string ExternalName; 4866 llvm::GlobalVariable *IvarOffsetGV = 4867 ObjCIvarOffsetVariable(ExternalName, Interface, Ivar); 4868 4869 return CGF.Builder.CreateLoad(IvarOffsetGV, false, "ivar"); 4870} 4871 4872CodeGen::RValue CGObjCNonFragileABIMac::EmitMessageSend( 4873 CodeGen::CodeGenFunction &CGF, 4874 QualType ResultType, 4875 Selector Sel, 4876 llvm::Value *Receiver, 4877 QualType Arg0Ty, 4878 bool IsSuper, 4879 const CallArgList &CallArgs) { 4880 // FIXME. Even though IsSuper is passes. This function doese not 4881 // handle calls to 'super' receivers. 4882 CodeGenTypes &Types = CGM.getTypes(); 4883 llvm::Value *Arg0 = Receiver; 4884 if (!IsSuper) 4885 Arg0 = CGF.Builder.CreateBitCast(Arg0, ObjCTypes.ObjectPtrTy, "tmp"); 4886 4887 // Find the message function name. 4888 // FIXME. This is too much work to get the ABI-specific result type 4889 // needed to find the message name. 4890 const CGFunctionInfo &FnInfo = Types.getFunctionInfo(ResultType, 4891 llvm::SmallVector<QualType, 16>()); 4892 llvm::Constant *Fn; 4893 std::string Name("\01l_"); 4894 if (CGM.ReturnTypeUsesSret(FnInfo)) { 4895#if 0 4896 // unlike what is documented. gcc never generates this API!! 4897 if (Receiver->getType() == ObjCTypes.ObjectPtrTy) { 4898 Fn = ObjCTypes.MessageSendIdStretFixupFn; 4899 // FIXME. Is there a better way of getting these names. 4900 // They are available in RuntimeFunctions vector pair. 4901 Name += "objc_msgSendId_stret_fixup"; 4902 } 4903 else 4904#endif 4905 if (IsSuper) { 4906 Fn = ObjCTypes.MessageSendSuper2StretFixupFn; 4907 Name += "objc_msgSendSuper2_stret_fixup"; 4908 } 4909 else 4910 { 4911 Fn = ObjCTypes.MessageSendStretFixupFn; 4912 Name += "objc_msgSend_stret_fixup"; 4913 } 4914 } 4915 else if (ResultType->isFloatingType() && 4916 // Selection of frret API only happens in 32bit nonfragile ABI. 4917 CGM.getTargetData().getTypePaddedSize(ObjCTypes.LongTy) == 4) { 4918 Fn = ObjCTypes.MessageSendFpretFixupFn; 4919 Name += "objc_msgSend_fpret_fixup"; 4920 } 4921 else { 4922#if 0 4923// unlike what is documented. gcc never generates this API!! 4924 if (Receiver->getType() == ObjCTypes.ObjectPtrTy) { 4925 Fn = ObjCTypes.MessageSendIdFixupFn; 4926 Name += "objc_msgSendId_fixup"; 4927 } 4928 else 4929#endif 4930 if (IsSuper) { 4931 Fn = ObjCTypes.MessageSendSuper2FixupFn; 4932 Name += "objc_msgSendSuper2_fixup"; 4933 } 4934 else 4935 { 4936 Fn = ObjCTypes.MessageSendFixupFn; 4937 Name += "objc_msgSend_fixup"; 4938 } 4939 } 4940 Name += '_'; 4941 std::string SelName(Sel.getAsString()); 4942 // Replace all ':' in selector name with '_' ouch! 4943 for(unsigned i = 0; i < SelName.size(); i++) 4944 if (SelName[i] == ':') 4945 SelName[i] = '_'; 4946 Name += SelName; 4947 llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name); 4948 if (!GV) { 4949 // Build messafe ref table entry. 4950 std::vector<llvm::Constant*> Values(2); 4951 Values[0] = Fn; 4952 Values[1] = GetMethodVarName(Sel); 4953 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 4954 GV = new llvm::GlobalVariable(Init->getType(), false, 4955 llvm::GlobalValue::WeakAnyLinkage, 4956 Init, 4957 Name, 4958 &CGM.getModule()); 4959 GV->setVisibility(llvm::GlobalValue::HiddenVisibility); 4960 GV->setAlignment( 4961 CGM.getTargetData().getPrefTypeAlignment(ObjCTypes.MessageRefTy)); 4962 GV->setSection("__DATA, __objc_msgrefs, coalesced"); 4963 UsedGlobals.push_back(GV); 4964 } 4965 llvm::Value *Arg1 = CGF.Builder.CreateBitCast(GV, ObjCTypes.MessageRefPtrTy); 4966 4967 CallArgList ActualArgs; 4968 ActualArgs.push_back(std::make_pair(RValue::get(Arg0), Arg0Ty)); 4969 ActualArgs.push_back(std::make_pair(RValue::get(Arg1), 4970 ObjCTypes.MessageRefCPtrTy)); 4971 ActualArgs.insert(ActualArgs.end(), CallArgs.begin(), CallArgs.end()); 4972 const CGFunctionInfo &FnInfo1 = Types.getFunctionInfo(ResultType, ActualArgs); 4973 llvm::Value *Callee = CGF.Builder.CreateStructGEP(Arg1, 0); 4974 Callee = CGF.Builder.CreateLoad(Callee); 4975 const llvm::FunctionType *FTy = Types.GetFunctionType(FnInfo1, true); 4976 Callee = CGF.Builder.CreateBitCast(Callee, 4977 llvm::PointerType::getUnqual(FTy)); 4978 return CGF.EmitCall(FnInfo1, Callee, ActualArgs); 4979} 4980 4981/// Generate code for a message send expression in the nonfragile abi. 4982CodeGen::RValue CGObjCNonFragileABIMac::GenerateMessageSend( 4983 CodeGen::CodeGenFunction &CGF, 4984 QualType ResultType, 4985 Selector Sel, 4986 llvm::Value *Receiver, 4987 bool IsClassMessage, 4988 const CallArgList &CallArgs) { 4989 return EmitMessageSend(CGF, ResultType, Sel, 4990 Receiver, CGF.getContext().getObjCIdType(), 4991 false, CallArgs); 4992} 4993 4994llvm::GlobalVariable * 4995CGObjCNonFragileABIMac::GetClassGlobal(const std::string &Name) { 4996 llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name); 4997 4998 if (!GV) { 4999 GV = new llvm::GlobalVariable(ObjCTypes.ClassnfABITy, false, 5000 llvm::GlobalValue::ExternalLinkage, 5001 0, Name, &CGM.getModule()); 5002 UsedGlobals.push_back(GV); 5003 } 5004 5005 return GV; 5006} 5007 5008llvm::Value *CGObjCNonFragileABIMac::EmitClassRef(CGBuilderTy &Builder, 5009 const ObjCInterfaceDecl *ID, 5010 bool IsSuper) { 5011 5012 llvm::GlobalVariable *&Entry = ClassReferences[ID->getIdentifier()]; 5013 5014 if (!Entry) { 5015 std::string ClassName("\01_OBJC_CLASS_$_" + ID->getNameAsString()); 5016 llvm::GlobalVariable *ClassGV = GetClassGlobal(ClassName); 5017 Entry = 5018 new llvm::GlobalVariable(ObjCTypes.ClassnfABIPtrTy, false, 5019 llvm::GlobalValue::InternalLinkage, 5020 ClassGV, 5021 IsSuper ? "\01L_OBJC_CLASSLIST_SUP_REFS_$_" 5022 : "\01L_OBJC_CLASSLIST_REFERENCES_$_", 5023 &CGM.getModule()); 5024 Entry->setAlignment( 5025 CGM.getTargetData().getPrefTypeAlignment( 5026 ObjCTypes.ClassnfABIPtrTy)); 5027 5028 if (IsSuper) 5029 Entry->setSection("__DATA,__objc_superrefs,regular,no_dead_strip"); 5030 else 5031 Entry->setSection("__DATA,__objc_classrefs,regular,no_dead_strip"); 5032 UsedGlobals.push_back(Entry); 5033 } 5034 5035 return Builder.CreateLoad(Entry, false, "tmp"); 5036} 5037 5038/// EmitMetaClassRef - Return a Value * of the address of _class_t 5039/// meta-data 5040/// 5041llvm::Value *CGObjCNonFragileABIMac::EmitMetaClassRef(CGBuilderTy &Builder, 5042 const ObjCInterfaceDecl *ID) { 5043 llvm::GlobalVariable * &Entry = MetaClassReferences[ID->getIdentifier()]; 5044 if (Entry) 5045 return Builder.CreateLoad(Entry, false, "tmp"); 5046 5047 std::string MetaClassName("\01_OBJC_METACLASS_$_" + ID->getNameAsString()); 5048 llvm::GlobalVariable *MetaClassGV = GetClassGlobal(MetaClassName); 5049 Entry = 5050 new llvm::GlobalVariable(ObjCTypes.ClassnfABIPtrTy, false, 5051 llvm::GlobalValue::InternalLinkage, 5052 MetaClassGV, 5053 "\01L_OBJC_CLASSLIST_SUP_REFS_$_", 5054 &CGM.getModule()); 5055 Entry->setAlignment( 5056 CGM.getTargetData().getPrefTypeAlignment( 5057 ObjCTypes.ClassnfABIPtrTy)); 5058 5059 Entry->setSection("__OBJC,__objc_superrefs,regular,no_dead_strip"); 5060 UsedGlobals.push_back(Entry); 5061 5062 return Builder.CreateLoad(Entry, false, "tmp"); 5063} 5064 5065/// GetClass - Return a reference to the class for the given interface 5066/// decl. 5067llvm::Value *CGObjCNonFragileABIMac::GetClass(CGBuilderTy &Builder, 5068 const ObjCInterfaceDecl *ID) { 5069 return EmitClassRef(Builder, ID); 5070} 5071 5072/// Generates a message send where the super is the receiver. This is 5073/// a message send to self with special delivery semantics indicating 5074/// which class's method should be called. 5075CodeGen::RValue 5076CGObjCNonFragileABIMac::GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF, 5077 QualType ResultType, 5078 Selector Sel, 5079 const ObjCInterfaceDecl *Class, 5080 bool isCategoryImpl, 5081 llvm::Value *Receiver, 5082 bool IsClassMessage, 5083 const CodeGen::CallArgList &CallArgs) { 5084 // ... 5085 // Create and init a super structure; this is a (receiver, class) 5086 // pair we will pass to objc_msgSendSuper. 5087 llvm::Value *ObjCSuper = 5088 CGF.Builder.CreateAlloca(ObjCTypes.SuperTy, 0, "objc_super"); 5089 5090 llvm::Value *ReceiverAsObject = 5091 CGF.Builder.CreateBitCast(Receiver, ObjCTypes.ObjectPtrTy); 5092 CGF.Builder.CreateStore(ReceiverAsObject, 5093 CGF.Builder.CreateStructGEP(ObjCSuper, 0)); 5094 5095 // If this is a class message the metaclass is passed as the target. 5096 llvm::Value *Target; 5097 if (IsClassMessage) { 5098 if (isCategoryImpl) { 5099 // Message sent to "super' in a class method defined in 5100 // a category implementation. 5101 Target = EmitClassRef(CGF.Builder, Class, false); 5102 Target = CGF.Builder.CreateStructGEP(Target, 0); 5103 Target = CGF.Builder.CreateLoad(Target); 5104 } 5105 else 5106 Target = EmitMetaClassRef(CGF.Builder, Class); 5107 } 5108 else 5109 Target = EmitClassRef(CGF.Builder, Class, true); 5110 5111 // FIXME: We shouldn't need to do this cast, rectify the ASTContext 5112 // and ObjCTypes types. 5113 const llvm::Type *ClassTy = 5114 CGM.getTypes().ConvertType(CGF.getContext().getObjCClassType()); 5115 Target = CGF.Builder.CreateBitCast(Target, ClassTy); 5116 CGF.Builder.CreateStore(Target, 5117 CGF.Builder.CreateStructGEP(ObjCSuper, 1)); 5118 5119 return EmitMessageSend(CGF, ResultType, Sel, 5120 ObjCSuper, ObjCTypes.SuperPtrCTy, 5121 true, CallArgs); 5122} 5123 5124llvm::Value *CGObjCNonFragileABIMac::EmitSelector(CGBuilderTy &Builder, 5125 Selector Sel) { 5126 llvm::GlobalVariable *&Entry = SelectorReferences[Sel]; 5127 5128 if (!Entry) { 5129 llvm::Constant *Casted = 5130 llvm::ConstantExpr::getBitCast(GetMethodVarName(Sel), 5131 ObjCTypes.SelectorPtrTy); 5132 Entry = 5133 new llvm::GlobalVariable(ObjCTypes.SelectorPtrTy, false, 5134 llvm::GlobalValue::InternalLinkage, 5135 Casted, "\01L_OBJC_SELECTOR_REFERENCES_", 5136 &CGM.getModule()); 5137 Entry->setSection("__DATA,__objc_selrefs,literal_pointers,no_dead_strip"); 5138 UsedGlobals.push_back(Entry); 5139 } 5140 5141 return Builder.CreateLoad(Entry, false, "tmp"); 5142} 5143/// EmitObjCIvarAssign - Code gen for assigning to a __strong object. 5144/// objc_assign_ivar (id src, id *dst) 5145/// 5146void CGObjCNonFragileABIMac::EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF, 5147 llvm::Value *src, llvm::Value *dst) 5148{ 5149 const llvm::Type * SrcTy = src->getType(); 5150 if (!isa<llvm::PointerType>(SrcTy)) { 5151 unsigned Size = CGM.getTargetData().getTypePaddedSize(SrcTy); 5152 assert(Size <= 8 && "does not support size > 8"); 5153 src = (Size == 4 ? CGF.Builder.CreateBitCast(src, ObjCTypes.IntTy) 5154 : CGF.Builder.CreateBitCast(src, ObjCTypes.LongTy)); 5155 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy); 5156 } 5157 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy); 5158 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy); 5159 CGF.Builder.CreateCall2(ObjCTypes.GcAssignIvarFn, 5160 src, dst, "assignivar"); 5161 return; 5162} 5163 5164/// EmitObjCStrongCastAssign - Code gen for assigning to a __strong cast object. 5165/// objc_assign_strongCast (id src, id *dst) 5166/// 5167void CGObjCNonFragileABIMac::EmitObjCStrongCastAssign( 5168 CodeGen::CodeGenFunction &CGF, 5169 llvm::Value *src, llvm::Value *dst) 5170{ 5171 const llvm::Type * SrcTy = src->getType(); 5172 if (!isa<llvm::PointerType>(SrcTy)) { 5173 unsigned Size = CGM.getTargetData().getTypePaddedSize(SrcTy); 5174 assert(Size <= 8 && "does not support size > 8"); 5175 src = (Size == 4 ? CGF.Builder.CreateBitCast(src, ObjCTypes.IntTy) 5176 : CGF.Builder.CreateBitCast(src, ObjCTypes.LongTy)); 5177 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy); 5178 } 5179 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy); 5180 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy); 5181 CGF.Builder.CreateCall2(ObjCTypes.GcAssignStrongCastFn, 5182 src, dst, "weakassign"); 5183 return; 5184} 5185 5186/// EmitObjCWeakRead - Code gen for loading value of a __weak 5187/// object: objc_read_weak (id *src) 5188/// 5189llvm::Value * CGObjCNonFragileABIMac::EmitObjCWeakRead( 5190 CodeGen::CodeGenFunction &CGF, 5191 llvm::Value *AddrWeakObj) 5192{ 5193 const llvm::Type* DestTy = 5194 cast<llvm::PointerType>(AddrWeakObj->getType())->getElementType(); 5195 AddrWeakObj = CGF.Builder.CreateBitCast(AddrWeakObj, ObjCTypes.PtrObjectPtrTy); 5196 llvm::Value *read_weak = CGF.Builder.CreateCall(ObjCTypes.GcReadWeakFn, 5197 AddrWeakObj, "weakread"); 5198 read_weak = CGF.Builder.CreateBitCast(read_weak, DestTy); 5199 return read_weak; 5200} 5201 5202/// EmitObjCWeakAssign - Code gen for assigning to a __weak object. 5203/// objc_assign_weak (id src, id *dst) 5204/// 5205void CGObjCNonFragileABIMac::EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF, 5206 llvm::Value *src, llvm::Value *dst) 5207{ 5208 const llvm::Type * SrcTy = src->getType(); 5209 if (!isa<llvm::PointerType>(SrcTy)) { 5210 unsigned Size = CGM.getTargetData().getTypePaddedSize(SrcTy); 5211 assert(Size <= 8 && "does not support size > 8"); 5212 src = (Size == 4 ? CGF.Builder.CreateBitCast(src, ObjCTypes.IntTy) 5213 : CGF.Builder.CreateBitCast(src, ObjCTypes.LongTy)); 5214 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy); 5215 } 5216 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy); 5217 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy); 5218 CGF.Builder.CreateCall2(ObjCTypes.GcAssignWeakFn, 5219 src, dst, "weakassign"); 5220 return; 5221} 5222 5223/// EmitObjCGlobalAssign - Code gen for assigning to a __strong object. 5224/// objc_assign_global (id src, id *dst) 5225/// 5226void CGObjCNonFragileABIMac::EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF, 5227 llvm::Value *src, llvm::Value *dst) 5228{ 5229 const llvm::Type * SrcTy = src->getType(); 5230 if (!isa<llvm::PointerType>(SrcTy)) { 5231 unsigned Size = CGM.getTargetData().getTypePaddedSize(SrcTy); 5232 assert(Size <= 8 && "does not support size > 8"); 5233 src = (Size == 4 ? CGF.Builder.CreateBitCast(src, ObjCTypes.IntTy) 5234 : CGF.Builder.CreateBitCast(src, ObjCTypes.LongTy)); 5235 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy); 5236 } 5237 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy); 5238 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy); 5239 CGF.Builder.CreateCall2(ObjCTypes.GcAssignGlobalFn, 5240 src, dst, "globalassign"); 5241 return; 5242} 5243 5244void 5245CGObjCNonFragileABIMac::EmitTryOrSynchronizedStmt(CodeGen::CodeGenFunction &CGF, 5246 const Stmt &S) { 5247 bool isTry = isa<ObjCAtTryStmt>(S); 5248 llvm::BasicBlock *TryBlock = CGF.createBasicBlock("try"); 5249 llvm::BasicBlock *PrevLandingPad = CGF.getInvokeDest(); 5250 llvm::BasicBlock *TryHandler = CGF.createBasicBlock("try.handler"); 5251 llvm::BasicBlock *FinallyBlock = CGF.createBasicBlock("finally"); 5252 llvm::BasicBlock *FinallyRethrow = CGF.createBasicBlock("finally.throw"); 5253 llvm::BasicBlock *FinallyEnd = CGF.createBasicBlock("finally.end"); 5254 5255 // For @synchronized, call objc_sync_enter(sync.expr). The 5256 // evaluation of the expression must occur before we enter the 5257 // @synchronized. We can safely avoid a temp here because jumps into 5258 // @synchronized are illegal & this will dominate uses. 5259 llvm::Value *SyncArg = 0; 5260 if (!isTry) { 5261 SyncArg = 5262 CGF.EmitScalarExpr(cast<ObjCAtSynchronizedStmt>(S).getSynchExpr()); 5263 SyncArg = CGF.Builder.CreateBitCast(SyncArg, ObjCTypes.ObjectPtrTy); 5264 CGF.Builder.CreateCall(ObjCTypes.SyncEnterFn, SyncArg); 5265 } 5266 5267 // Push an EH context entry, used for handling rethrows and jumps 5268 // through finally. 5269 CGF.PushCleanupBlock(FinallyBlock); 5270 5271 CGF.setInvokeDest(TryHandler); 5272 5273 CGF.EmitBlock(TryBlock); 5274 CGF.EmitStmt(isTry ? cast<ObjCAtTryStmt>(S).getTryBody() 5275 : cast<ObjCAtSynchronizedStmt>(S).getSynchBody()); 5276 CGF.EmitBranchThroughCleanup(FinallyEnd); 5277 5278 // Emit the exception handler. 5279 5280 CGF.EmitBlock(TryHandler); 5281 5282 llvm::Value *llvm_eh_exception = 5283 CGF.CGM.getIntrinsic(llvm::Intrinsic::eh_exception); 5284 llvm::Value *llvm_eh_selector_i64 = 5285 CGF.CGM.getIntrinsic(llvm::Intrinsic::eh_selector_i64); 5286 llvm::Value *llvm_eh_typeid_for_i64 = 5287 CGF.CGM.getIntrinsic(llvm::Intrinsic::eh_typeid_for_i64); 5288 llvm::Value *Exc = CGF.Builder.CreateCall(llvm_eh_exception, "exc"); 5289 llvm::Value *RethrowPtr = CGF.CreateTempAlloca(Exc->getType(), "_rethrow"); 5290 5291 llvm::SmallVector<llvm::Value*, 8> SelectorArgs; 5292 SelectorArgs.push_back(Exc); 5293 SelectorArgs.push_back(ObjCTypes.EHPersonalityPtr); 5294 5295 // Construct the lists of (type, catch body) to handle. 5296 llvm::SmallVector<std::pair<const ParmVarDecl*, const Stmt*>, 8> Handlers; 5297 bool HasCatchAll = false; 5298 if (isTry) { 5299 if (const ObjCAtCatchStmt* CatchStmt = 5300 cast<ObjCAtTryStmt>(S).getCatchStmts()) { 5301 for (; CatchStmt; CatchStmt = CatchStmt->getNextCatchStmt()) { 5302 const ParmVarDecl *CatchDecl = CatchStmt->getCatchParamDecl(); 5303 Handlers.push_back(std::make_pair(CatchDecl, CatchStmt->getCatchBody())); 5304 5305 // catch(...) always matches. 5306 if (!CatchDecl) { 5307 // Use i8* null here to signal this is a catch all, not a cleanup. 5308 llvm::Value *Null = llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy); 5309 SelectorArgs.push_back(Null); 5310 HasCatchAll = true; 5311 break; 5312 } 5313 5314 if (CGF.getContext().isObjCIdType(CatchDecl->getType()) || 5315 CatchDecl->getType()->isObjCQualifiedIdType()) { 5316 llvm::Value *IDEHType = 5317 CGM.getModule().getGlobalVariable("OBJC_EHTYPE_id"); 5318 if (!IDEHType) 5319 IDEHType = 5320 new llvm::GlobalVariable(ObjCTypes.EHTypeTy, false, 5321 llvm::GlobalValue::ExternalLinkage, 5322 0, "OBJC_EHTYPE_id", &CGM.getModule()); 5323 SelectorArgs.push_back(IDEHType); 5324 HasCatchAll = true; 5325 break; 5326 } 5327 5328 // All other types should be Objective-C interface pointer types. 5329 const PointerType *PT = CatchDecl->getType()->getAsPointerType(); 5330 assert(PT && "Invalid @catch type."); 5331 const ObjCInterfaceType *IT = 5332 PT->getPointeeType()->getAsObjCInterfaceType(); 5333 assert(IT && "Invalid @catch type."); 5334 llvm::Value *EHType = GetInterfaceEHType(IT); 5335 SelectorArgs.push_back(EHType); 5336 } 5337 } 5338 } 5339 5340 // We use a cleanup unless there was already a catch all. 5341 if (!HasCatchAll) { 5342 SelectorArgs.push_back(llvm::ConstantInt::get(llvm::Type::Int32Ty, 0)); 5343 Handlers.push_back(std::make_pair((const ParmVarDecl*) 0, (const Stmt*) 0)); 5344 } 5345 5346 llvm::Value *Selector = 5347 CGF.Builder.CreateCall(llvm_eh_selector_i64, 5348 SelectorArgs.begin(), SelectorArgs.end(), 5349 "selector"); 5350 for (unsigned i = 0, e = Handlers.size(); i != e; ++i) { 5351 const ParmVarDecl *CatchParam = Handlers[i].first; 5352 const Stmt *CatchBody = Handlers[i].second; 5353 5354 llvm::BasicBlock *Next = 0; 5355 5356 // The last handler always matches. 5357 if (i + 1 != e) { 5358 assert(CatchParam && "Only last handler can be a catch all."); 5359 5360 llvm::BasicBlock *Match = CGF.createBasicBlock("match"); 5361 Next = CGF.createBasicBlock("catch.next"); 5362 llvm::Value *Id = 5363 CGF.Builder.CreateCall(llvm_eh_typeid_for_i64, 5364 CGF.Builder.CreateBitCast(SelectorArgs[i+2], 5365 ObjCTypes.Int8PtrTy)); 5366 CGF.Builder.CreateCondBr(CGF.Builder.CreateICmpEQ(Selector, Id), 5367 Match, Next); 5368 5369 CGF.EmitBlock(Match); 5370 } 5371 5372 if (CatchBody) { 5373 llvm::BasicBlock *MatchEnd = CGF.createBasicBlock("match.end"); 5374 llvm::BasicBlock *MatchHandler = CGF.createBasicBlock("match.handler"); 5375 5376 // Cleanups must call objc_end_catch. 5377 // 5378 // FIXME: It seems incorrect for objc_begin_catch to be inside 5379 // this context, but this matches gcc. 5380 CGF.PushCleanupBlock(MatchEnd); 5381 CGF.setInvokeDest(MatchHandler); 5382 5383 llvm::Value *ExcObject = 5384 CGF.Builder.CreateCall(ObjCTypes.ObjCBeginCatchFn, Exc); 5385 5386 // Bind the catch parameter if it exists. 5387 if (CatchParam) { 5388 ExcObject = 5389 CGF.Builder.CreateBitCast(ExcObject, 5390 CGF.ConvertType(CatchParam->getType())); 5391 // CatchParam is a ParmVarDecl because of the grammar 5392 // construction used to handle this, but for codegen purposes 5393 // we treat this as a local decl. 5394 CGF.EmitLocalBlockVarDecl(*CatchParam); 5395 CGF.Builder.CreateStore(ExcObject, CGF.GetAddrOfLocalVar(CatchParam)); 5396 } 5397 5398 CGF.ObjCEHValueStack.push_back(ExcObject); 5399 CGF.EmitStmt(CatchBody); 5400 CGF.ObjCEHValueStack.pop_back(); 5401 5402 CGF.EmitBranchThroughCleanup(FinallyEnd); 5403 5404 CGF.EmitBlock(MatchHandler); 5405 5406 llvm::Value *Exc = CGF.Builder.CreateCall(llvm_eh_exception, "exc"); 5407 // We are required to emit this call to satisfy LLVM, even 5408 // though we don't use the result. 5409 llvm::SmallVector<llvm::Value*, 8> Args; 5410 Args.push_back(Exc); 5411 Args.push_back(ObjCTypes.EHPersonalityPtr); 5412 Args.push_back(llvm::ConstantInt::get(llvm::Type::Int32Ty, 5413 0)); 5414 CGF.Builder.CreateCall(llvm_eh_selector_i64, Args.begin(), Args.end()); 5415 CGF.Builder.CreateStore(Exc, RethrowPtr); 5416 CGF.EmitBranchThroughCleanup(FinallyRethrow); 5417 5418 CodeGenFunction::CleanupBlockInfo Info = CGF.PopCleanupBlock(); 5419 5420 CGF.EmitBlock(MatchEnd); 5421 5422 // Unfortunately, we also have to generate another EH frame here 5423 // in case this throws. 5424 llvm::BasicBlock *MatchEndHandler = 5425 CGF.createBasicBlock("match.end.handler"); 5426 llvm::BasicBlock *Cont = CGF.createBasicBlock("invoke.cont"); 5427 CGF.Builder.CreateInvoke(ObjCTypes.ObjCEndCatchFn, 5428 Cont, MatchEndHandler, 5429 Args.begin(), Args.begin()); 5430 5431 CGF.EmitBlock(Cont); 5432 if (Info.SwitchBlock) 5433 CGF.EmitBlock(Info.SwitchBlock); 5434 if (Info.EndBlock) 5435 CGF.EmitBlock(Info.EndBlock); 5436 5437 CGF.EmitBlock(MatchEndHandler); 5438 Exc = CGF.Builder.CreateCall(llvm_eh_exception, "exc"); 5439 // We are required to emit this call to satisfy LLVM, even 5440 // though we don't use the result. 5441 Args.clear(); 5442 Args.push_back(Exc); 5443 Args.push_back(ObjCTypes.EHPersonalityPtr); 5444 Args.push_back(llvm::ConstantInt::get(llvm::Type::Int32Ty, 5445 0)); 5446 CGF.Builder.CreateCall(llvm_eh_selector_i64, Args.begin(), Args.end()); 5447 CGF.Builder.CreateStore(Exc, RethrowPtr); 5448 CGF.EmitBranchThroughCleanup(FinallyRethrow); 5449 5450 if (Next) 5451 CGF.EmitBlock(Next); 5452 } else { 5453 assert(!Next && "catchup should be last handler."); 5454 5455 CGF.Builder.CreateStore(Exc, RethrowPtr); 5456 CGF.EmitBranchThroughCleanup(FinallyRethrow); 5457 } 5458 } 5459 5460 // Pop the cleanup entry, the @finally is outside this cleanup 5461 // scope. 5462 CodeGenFunction::CleanupBlockInfo Info = CGF.PopCleanupBlock(); 5463 CGF.setInvokeDest(PrevLandingPad); 5464 5465 CGF.EmitBlock(FinallyBlock); 5466 5467 if (isTry) { 5468 if (const ObjCAtFinallyStmt* FinallyStmt = 5469 cast<ObjCAtTryStmt>(S).getFinallyStmt()) 5470 CGF.EmitStmt(FinallyStmt->getFinallyBody()); 5471 } else { 5472 // Emit 'objc_sync_exit(expr)' as finally's sole statement for 5473 // @synchronized. 5474 CGF.Builder.CreateCall(ObjCTypes.SyncExitFn, SyncArg); 5475 } 5476 5477 if (Info.SwitchBlock) 5478 CGF.EmitBlock(Info.SwitchBlock); 5479 if (Info.EndBlock) 5480 CGF.EmitBlock(Info.EndBlock); 5481 5482 // Branch around the rethrow code. 5483 CGF.EmitBranch(FinallyEnd); 5484 5485 CGF.EmitBlock(FinallyRethrow); 5486 CGF.Builder.CreateCall(ObjCTypes.UnwindResumeOrRethrowFn, 5487 CGF.Builder.CreateLoad(RethrowPtr)); 5488 CGF.Builder.CreateUnreachable(); 5489 5490 CGF.EmitBlock(FinallyEnd); 5491} 5492 5493/// EmitThrowStmt - Generate code for a throw statement. 5494void CGObjCNonFragileABIMac::EmitThrowStmt(CodeGen::CodeGenFunction &CGF, 5495 const ObjCAtThrowStmt &S) { 5496 llvm::Value *Exception; 5497 if (const Expr *ThrowExpr = S.getThrowExpr()) { 5498 Exception = CGF.EmitScalarExpr(ThrowExpr); 5499 } else { 5500 assert((!CGF.ObjCEHValueStack.empty() && CGF.ObjCEHValueStack.back()) && 5501 "Unexpected rethrow outside @catch block."); 5502 Exception = CGF.ObjCEHValueStack.back(); 5503 } 5504 5505 llvm::Value *ExceptionAsObject = 5506 CGF.Builder.CreateBitCast(Exception, ObjCTypes.ObjectPtrTy, "tmp"); 5507 llvm::BasicBlock *InvokeDest = CGF.getInvokeDest(); 5508 if (InvokeDest) { 5509 llvm::BasicBlock *Cont = CGF.createBasicBlock("invoke.cont"); 5510 CGF.Builder.CreateInvoke(ObjCTypes.ExceptionThrowFn, 5511 Cont, InvokeDest, 5512 &ExceptionAsObject, &ExceptionAsObject + 1); 5513 CGF.EmitBlock(Cont); 5514 } else 5515 CGF.Builder.CreateCall(ObjCTypes.ExceptionThrowFn, ExceptionAsObject); 5516 CGF.Builder.CreateUnreachable(); 5517 5518 // Clear the insertion point to indicate we are in unreachable code. 5519 CGF.Builder.ClearInsertionPoint(); 5520} 5521 5522llvm::Value * 5523CGObjCNonFragileABIMac::GetInterfaceEHType(const ObjCInterfaceType *IT) { 5524 const ObjCInterfaceDecl *ID = IT->getDecl(); 5525 llvm::GlobalVariable * &Entry = EHTypeReferences[ID->getIdentifier()]; 5526 if (Entry) 5527 return Entry; 5528 5529 std::string ClassName("\01_OBJC_CLASS_$_" + ID->getNameAsString()); 5530 std::string VTableName = "objc_ehtype_vtable"; 5531 llvm::GlobalVariable *VTableGV = 5532 CGM.getModule().getGlobalVariable(VTableName); 5533 if (!VTableGV) 5534 VTableGV = new llvm::GlobalVariable(ObjCTypes.Int8PtrTy, false, 5535 llvm::GlobalValue::ExternalLinkage, 5536 0, VTableName, &CGM.getModule()); 5537 5538 llvm::Value *VTableIdx = llvm::ConstantInt::get(llvm::Type::Int32Ty, 2); 5539 5540 std::vector<llvm::Constant*> Values(3); 5541 Values[0] = llvm::ConstantExpr::getGetElementPtr(VTableGV, &VTableIdx, 1); 5542 Values[1] = GetClassName(ID->getIdentifier()); 5543 Values[2] = GetClassGlobal(ClassName); 5544 llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.EHTypeTy, Values); 5545 5546 Entry = 5547 new llvm::GlobalVariable(ObjCTypes.EHTypeTy, false, 5548 llvm::GlobalValue::WeakAnyLinkage, 5549 Init, 5550 (std::string("OBJC_EHTYPE_$_") + 5551 ID->getIdentifier()->getName()), 5552 &CGM.getModule()); 5553 5554 return Entry; 5555} 5556 5557/* *** */ 5558 5559CodeGen::CGObjCRuntime * 5560CodeGen::CreateMacObjCRuntime(CodeGen::CodeGenModule &CGM) { 5561 return new CGObjCMac(CGM); 5562} 5563 5564CodeGen::CGObjCRuntime * 5565CodeGen::CreateMacNonFragileABIObjCRuntime(CodeGen::CodeGenModule &CGM) { 5566 return new CGObjCNonFragileABIMac(CGM); 5567} 5568