CGObjCMac.cpp revision 17945a0f64fe03ff6ec0c2146005a87636e3ac12
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/AST/RecordLayout.h" 22#include "clang/AST/StmtObjC.h" 23#include "clang/Basic/LangOptions.h" 24 25#include "llvm/Intrinsics.h" 26#include "llvm/Module.h" 27#include "llvm/ADT/DenseSet.h" 28#include "llvm/Target/TargetData.h" 29#include <sstream> 30 31using namespace clang; 32using namespace CodeGen; 33 34// Common CGObjCRuntime functions, these don't belong here, but they 35// don't belong in CGObjCRuntime either so we will live with it for 36// now. 37 38/// FindIvarInterface - Find the interface containing the ivar. 39/// 40/// FIXME: We shouldn't need to do this, the containing context should 41/// be fixed. 42static const ObjCInterfaceDecl *FindIvarInterface(ASTContext &Context, 43 const ObjCInterfaceDecl *OID, 44 const ObjCIvarDecl *OIVD, 45 unsigned &Index) { 46 // FIXME: The index here is closely tied to how 47 // ASTContext::getObjCLayout is implemented. This should be fixed to 48 // get the information from the layout directly. 49 Index = 0; 50 llvm::SmallVector<ObjCIvarDecl*, 16> Ivars; 51 Context.ShallowCollectObjCIvars(OID, Ivars); 52 for (unsigned k = 0, e = Ivars.size(); k != e; ++k) { 53 if (OIVD == Ivars[k]) 54 return OID; 55 ++Index; 56 } 57 58 // Otherwise check in the super class. 59 if (const ObjCInterfaceDecl *Super = OID->getSuperClass()) 60 return FindIvarInterface(Context, Super, OIVD, Index); 61 62 return 0; 63} 64 65static uint64_t LookupFieldBitOffset(CodeGen::CodeGenModule &CGM, 66 const ObjCInterfaceDecl *OID, 67 const ObjCImplementationDecl *ID, 68 const ObjCIvarDecl *Ivar) { 69 unsigned Index; 70 const ObjCInterfaceDecl *Container = 71 FindIvarInterface(CGM.getContext(), OID, Ivar, Index); 72 assert(Container && "Unable to find ivar container"); 73 74 // If we know have an implementation (and the ivar is in it) then 75 // look up in the implementation layout. 76 const ASTRecordLayout *RL; 77 if (ID && ID->getClassInterface() == Container) 78 RL = &CGM.getContext().getASTObjCImplementationLayout(ID); 79 else 80 RL = &CGM.getContext().getASTObjCInterfaceLayout(Container); 81 return RL->getFieldOffset(Index); 82} 83 84uint64_t CGObjCRuntime::ComputeIvarBaseOffset(CodeGen::CodeGenModule &CGM, 85 const ObjCInterfaceDecl *OID, 86 const ObjCIvarDecl *Ivar) { 87 return LookupFieldBitOffset(CGM, OID, 0, Ivar) / 8; 88} 89 90uint64_t CGObjCRuntime::ComputeIvarBaseOffset(CodeGen::CodeGenModule &CGM, 91 const ObjCImplementationDecl *OID, 92 const ObjCIvarDecl *Ivar) { 93 return LookupFieldBitOffset(CGM, OID->getClassInterface(), OID, Ivar) / 8; 94} 95 96LValue CGObjCRuntime::EmitValueForIvarAtOffset(CodeGen::CodeGenFunction &CGF, 97 const ObjCInterfaceDecl *OID, 98 llvm::Value *BaseValue, 99 const ObjCIvarDecl *Ivar, 100 unsigned CVRQualifiers, 101 llvm::Value *Offset) { 102 // Compute (type*) ( (char *) BaseValue + Offset) 103 llvm::Type *I8Ptr = llvm::PointerType::getUnqual(llvm::Type::Int8Ty); 104 QualType IvarTy = Ivar->getType(); 105 const llvm::Type *LTy = CGF.CGM.getTypes().ConvertTypeForMem(IvarTy); 106 llvm::Value *V = CGF.Builder.CreateBitCast(BaseValue, I8Ptr); 107 V = CGF.Builder.CreateGEP(V, Offset, "add.ptr"); 108 V = CGF.Builder.CreateBitCast(V, llvm::PointerType::getUnqual(LTy)); 109 110 if (Ivar->isBitField()) { 111 // We need to compute the bit offset for the bit-field, the offset 112 // is to the byte. Note, there is a subtle invariant here: we can 113 // only call this routine on non-sythesized ivars but we may be 114 // called for synthesized ivars. However, a synthesized ivar can 115 // never be a bit-field so this is safe. 116 uint64_t BitOffset = LookupFieldBitOffset(CGF.CGM, OID, 0, Ivar) % 8; 117 118 uint64_t BitFieldSize = 119 Ivar->getBitWidth()->EvaluateAsInt(CGF.getContext()).getZExtValue(); 120 return LValue::MakeBitfield(V, BitOffset, BitFieldSize, 121 IvarTy->isSignedIntegerType(), 122 IvarTy.getCVRQualifiers()|CVRQualifiers); 123 } 124 125 LValue LV = LValue::MakeAddr(V, IvarTy.getCVRQualifiers()|CVRQualifiers, 126 CGF.CGM.getContext().getObjCGCAttrKind(IvarTy)); 127 LValue::SetObjCIvar(LV, true); 128 return LV; 129} 130 131/// 132 133namespace { 134 135 typedef std::vector<llvm::Constant*> ConstantVector; 136 137 // FIXME: We should find a nicer way to make the labels for metadata, string 138 // concatenation is lame. 139 140class ObjCCommonTypesHelper { 141private: 142 llvm::Constant *getMessageSendFn() const { 143 // id objc_msgSend (id, SEL, ...) 144 std::vector<const llvm::Type*> Params; 145 Params.push_back(ObjectPtrTy); 146 Params.push_back(SelectorPtrTy); 147 return 148 CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 149 Params, true), 150 "objc_msgSend"); 151 } 152 153 llvm::Constant *getMessageSendStretFn() const { 154 // id objc_msgSend_stret (id, SEL, ...) 155 std::vector<const llvm::Type*> Params; 156 Params.push_back(ObjectPtrTy); 157 Params.push_back(SelectorPtrTy); 158 return 159 CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::VoidTy, 160 Params, true), 161 "objc_msgSend_stret"); 162 163 } 164 165 llvm::Constant *getMessageSendFpretFn() const { 166 // FIXME: This should be long double on x86_64? 167 // [double | long double] objc_msgSend_fpret(id self, SEL op, ...) 168 std::vector<const llvm::Type*> Params; 169 Params.push_back(ObjectPtrTy); 170 Params.push_back(SelectorPtrTy); 171 return 172 CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::DoubleTy, 173 Params, 174 true), 175 "objc_msgSend_fpret"); 176 177 } 178 179 llvm::Constant *getMessageSendSuperFn() const { 180 // id objc_msgSendSuper(struct objc_super *super, SEL op, ...) 181 const char *SuperName = "objc_msgSendSuper"; 182 std::vector<const llvm::Type*> Params; 183 Params.push_back(SuperPtrTy); 184 Params.push_back(SelectorPtrTy); 185 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 186 Params, true), 187 SuperName); 188 } 189 190 llvm::Constant *getMessageSendSuperFn2() const { 191 // id objc_msgSendSuper2(struct objc_super *super, SEL op, ...) 192 const char *SuperName = "objc_msgSendSuper2"; 193 std::vector<const llvm::Type*> Params; 194 Params.push_back(SuperPtrTy); 195 Params.push_back(SelectorPtrTy); 196 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 197 Params, true), 198 SuperName); 199 } 200 201 llvm::Constant *getMessageSendSuperStretFn() const { 202 // void objc_msgSendSuper_stret(void * stretAddr, struct objc_super *super, 203 // SEL op, ...) 204 std::vector<const llvm::Type*> Params; 205 Params.push_back(Int8PtrTy); 206 Params.push_back(SuperPtrTy); 207 Params.push_back(SelectorPtrTy); 208 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::VoidTy, 209 Params, true), 210 "objc_msgSendSuper_stret"); 211 } 212 213 llvm::Constant *getMessageSendSuperStretFn2() const { 214 // void objc_msgSendSuper2_stret(void * stretAddr, struct objc_super *super, 215 // SEL op, ...) 216 std::vector<const llvm::Type*> Params; 217 Params.push_back(Int8PtrTy); 218 Params.push_back(SuperPtrTy); 219 Params.push_back(SelectorPtrTy); 220 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::VoidTy, 221 Params, true), 222 "objc_msgSendSuper2_stret"); 223 } 224 225 llvm::Constant *getMessageSendSuperFpretFn() const { 226 // There is no objc_msgSendSuper_fpret? How can that work? 227 return getMessageSendSuperFn(); 228 } 229 230 llvm::Constant *getMessageSendSuperFpretFn2() const { 231 // There is no objc_msgSendSuper_fpret? How can that work? 232 return getMessageSendSuperFn2(); 233 } 234 235protected: 236 CodeGen::CodeGenModule &CGM; 237 238public: 239 const llvm::Type *ShortTy, *IntTy, *LongTy, *LongLongTy; 240 const llvm::Type *Int8PtrTy; 241 242 /// ObjectPtrTy - LLVM type for object handles (typeof(id)) 243 const llvm::Type *ObjectPtrTy; 244 245 /// PtrObjectPtrTy - LLVM type for id * 246 const llvm::Type *PtrObjectPtrTy; 247 248 /// SelectorPtrTy - LLVM type for selector handles (typeof(SEL)) 249 const llvm::Type *SelectorPtrTy; 250 /// ProtocolPtrTy - LLVM type for external protocol handles 251 /// (typeof(Protocol)) 252 const llvm::Type *ExternalProtocolPtrTy; 253 254 // SuperCTy - clang type for struct objc_super. 255 QualType SuperCTy; 256 // SuperPtrCTy - clang type for struct objc_super *. 257 QualType SuperPtrCTy; 258 259 /// SuperTy - LLVM type for struct objc_super. 260 const llvm::StructType *SuperTy; 261 /// SuperPtrTy - LLVM type for struct objc_super *. 262 const llvm::Type *SuperPtrTy; 263 264 /// PropertyTy - LLVM type for struct objc_property (struct _prop_t 265 /// in GCC parlance). 266 const llvm::StructType *PropertyTy; 267 268 /// PropertyListTy - LLVM type for struct objc_property_list 269 /// (_prop_list_t in GCC parlance). 270 const llvm::StructType *PropertyListTy; 271 /// PropertyListPtrTy - LLVM type for struct objc_property_list*. 272 const llvm::Type *PropertyListPtrTy; 273 274 // MethodTy - LLVM type for struct objc_method. 275 const llvm::StructType *MethodTy; 276 277 /// CacheTy - LLVM type for struct objc_cache. 278 const llvm::Type *CacheTy; 279 /// CachePtrTy - LLVM type for struct objc_cache *. 280 const llvm::Type *CachePtrTy; 281 282 llvm::Constant *getGetPropertyFn() { 283 CodeGen::CodeGenTypes &Types = CGM.getTypes(); 284 ASTContext &Ctx = CGM.getContext(); 285 // id objc_getProperty (id, SEL, ptrdiff_t, bool) 286 llvm::SmallVector<QualType,16> Params; 287 QualType IdType = Ctx.getObjCIdType(); 288 QualType SelType = Ctx.getObjCSelType(); 289 Params.push_back(IdType); 290 Params.push_back(SelType); 291 Params.push_back(Ctx.LongTy); 292 Params.push_back(Ctx.BoolTy); 293 const llvm::FunctionType *FTy = 294 Types.GetFunctionType(Types.getFunctionInfo(IdType, Params), false); 295 return CGM.CreateRuntimeFunction(FTy, "objc_getProperty"); 296 } 297 298 llvm::Constant *getSetPropertyFn() { 299 CodeGen::CodeGenTypes &Types = CGM.getTypes(); 300 ASTContext &Ctx = CGM.getContext(); 301 // void objc_setProperty (id, SEL, ptrdiff_t, id, bool, bool) 302 llvm::SmallVector<QualType,16> Params; 303 QualType IdType = Ctx.getObjCIdType(); 304 QualType SelType = Ctx.getObjCSelType(); 305 Params.push_back(IdType); 306 Params.push_back(SelType); 307 Params.push_back(Ctx.LongTy); 308 Params.push_back(IdType); 309 Params.push_back(Ctx.BoolTy); 310 Params.push_back(Ctx.BoolTy); 311 const llvm::FunctionType *FTy = 312 Types.GetFunctionType(Types.getFunctionInfo(Ctx.VoidTy, Params), false); 313 return CGM.CreateRuntimeFunction(FTy, "objc_setProperty"); 314 } 315 316 llvm::Constant *getEnumerationMutationFn() { 317 // void objc_enumerationMutation (id) 318 std::vector<const llvm::Type*> Args; 319 Args.push_back(ObjectPtrTy); 320 llvm::FunctionType *FTy = 321 llvm::FunctionType::get(llvm::Type::VoidTy, Args, false); 322 return CGM.CreateRuntimeFunction(FTy, "objc_enumerationMutation"); 323 } 324 325 /// GcReadWeakFn -- LLVM objc_read_weak (id *src) function. 326 llvm::Constant *getGcReadWeakFn() { 327 // id objc_read_weak (id *) 328 std::vector<const llvm::Type*> Args; 329 Args.push_back(ObjectPtrTy->getPointerTo()); 330 llvm::FunctionType *FTy = llvm::FunctionType::get(ObjectPtrTy, Args, false); 331 return CGM.CreateRuntimeFunction(FTy, "objc_read_weak"); 332 } 333 334 /// GcAssignWeakFn -- LLVM objc_assign_weak function. 335 llvm::Constant *getGcAssignWeakFn() { 336 // id objc_assign_weak (id, id *) 337 std::vector<const llvm::Type*> Args(1, ObjectPtrTy); 338 Args.push_back(ObjectPtrTy->getPointerTo()); 339 llvm::FunctionType *FTy = 340 llvm::FunctionType::get(ObjectPtrTy, Args, false); 341 return CGM.CreateRuntimeFunction(FTy, "objc_assign_weak"); 342 } 343 344 /// GcAssignGlobalFn -- LLVM objc_assign_global function. 345 llvm::Constant *getGcAssignGlobalFn() { 346 // id objc_assign_global(id, id *) 347 std::vector<const llvm::Type*> Args(1, ObjectPtrTy); 348 Args.push_back(ObjectPtrTy->getPointerTo()); 349 llvm::FunctionType *FTy = llvm::FunctionType::get(ObjectPtrTy, Args, false); 350 return CGM.CreateRuntimeFunction(FTy, "objc_assign_global"); 351 } 352 353 /// GcAssignIvarFn -- LLVM objc_assign_ivar function. 354 llvm::Constant *getGcAssignIvarFn() { 355 // id objc_assign_ivar(id, id *) 356 std::vector<const llvm::Type*> Args(1, ObjectPtrTy); 357 Args.push_back(ObjectPtrTy->getPointerTo()); 358 llvm::FunctionType *FTy = llvm::FunctionType::get(ObjectPtrTy, Args, false); 359 return CGM.CreateRuntimeFunction(FTy, "objc_assign_ivar"); 360 } 361 362 /// GcAssignStrongCastFn -- LLVM objc_assign_strongCast function. 363 llvm::Constant *getGcAssignStrongCastFn() { 364 // id objc_assign_global(id, id *) 365 std::vector<const llvm::Type*> Args(1, ObjectPtrTy); 366 Args.push_back(ObjectPtrTy->getPointerTo()); 367 llvm::FunctionType *FTy = llvm::FunctionType::get(ObjectPtrTy, Args, false); 368 return CGM.CreateRuntimeFunction(FTy, "objc_assign_strongCast"); 369 } 370 371 /// ExceptionThrowFn - LLVM objc_exception_throw function. 372 llvm::Constant *getExceptionThrowFn() { 373 // void objc_exception_throw(id) 374 std::vector<const llvm::Type*> Args(1, ObjectPtrTy); 375 llvm::FunctionType *FTy = 376 llvm::FunctionType::get(llvm::Type::VoidTy, Args, false); 377 return CGM.CreateRuntimeFunction(FTy, "objc_exception_throw"); 378 } 379 380 /// SyncEnterFn - LLVM object_sync_enter function. 381 llvm::Constant *getSyncEnterFn() { 382 // void objc_sync_enter (id) 383 std::vector<const llvm::Type*> Args(1, ObjectPtrTy); 384 llvm::FunctionType *FTy = 385 llvm::FunctionType::get(llvm::Type::VoidTy, Args, false); 386 return CGM.CreateRuntimeFunction(FTy, "objc_sync_enter"); 387 } 388 389 /// SyncExitFn - LLVM object_sync_exit function. 390 llvm::Constant *getSyncExitFn() { 391 // void objc_sync_exit (id) 392 std::vector<const llvm::Type*> Args(1, ObjectPtrTy); 393 llvm::FunctionType *FTy = 394 llvm::FunctionType::get(llvm::Type::VoidTy, Args, false); 395 return CGM.CreateRuntimeFunction(FTy, "objc_sync_exit"); 396 } 397 398 llvm::Constant *getSendFn(bool IsSuper) const { 399 return IsSuper ? getMessageSendSuperFn() : getMessageSendFn(); 400 } 401 402 llvm::Constant *getSendFn2(bool IsSuper) const { 403 return IsSuper ? getMessageSendSuperFn2() : getMessageSendFn(); 404 } 405 406 llvm::Constant *getSendStretFn(bool IsSuper) const { 407 return IsSuper ? getMessageSendSuperStretFn() : getMessageSendStretFn(); 408 } 409 410 llvm::Constant *getSendStretFn2(bool IsSuper) const { 411 return IsSuper ? getMessageSendSuperStretFn2() : getMessageSendStretFn(); 412 } 413 414 llvm::Constant *getSendFpretFn(bool IsSuper) const { 415 return IsSuper ? getMessageSendSuperFpretFn() : getMessageSendFpretFn(); 416 } 417 418 llvm::Constant *getSendFpretFn2(bool IsSuper) const { 419 return IsSuper ? getMessageSendSuperFpretFn2() : getMessageSendFpretFn(); 420 } 421 422 ObjCCommonTypesHelper(CodeGen::CodeGenModule &cgm); 423 ~ObjCCommonTypesHelper(){} 424}; 425 426/// ObjCTypesHelper - Helper class that encapsulates lazy 427/// construction of varies types used during ObjC generation. 428class ObjCTypesHelper : public ObjCCommonTypesHelper { 429public: 430 /// SymtabTy - LLVM type for struct objc_symtab. 431 const llvm::StructType *SymtabTy; 432 /// SymtabPtrTy - LLVM type for struct objc_symtab *. 433 const llvm::Type *SymtabPtrTy; 434 /// ModuleTy - LLVM type for struct objc_module. 435 const llvm::StructType *ModuleTy; 436 437 /// ProtocolTy - LLVM type for struct objc_protocol. 438 const llvm::StructType *ProtocolTy; 439 /// ProtocolPtrTy - LLVM type for struct objc_protocol *. 440 const llvm::Type *ProtocolPtrTy; 441 /// ProtocolExtensionTy - LLVM type for struct 442 /// objc_protocol_extension. 443 const llvm::StructType *ProtocolExtensionTy; 444 /// ProtocolExtensionTy - LLVM type for struct 445 /// objc_protocol_extension *. 446 const llvm::Type *ProtocolExtensionPtrTy; 447 /// MethodDescriptionTy - LLVM type for struct 448 /// objc_method_description. 449 const llvm::StructType *MethodDescriptionTy; 450 /// MethodDescriptionListTy - LLVM type for struct 451 /// objc_method_description_list. 452 const llvm::StructType *MethodDescriptionListTy; 453 /// MethodDescriptionListPtrTy - LLVM type for struct 454 /// objc_method_description_list *. 455 const llvm::Type *MethodDescriptionListPtrTy; 456 /// ProtocolListTy - LLVM type for struct objc_property_list. 457 const llvm::Type *ProtocolListTy; 458 /// ProtocolListPtrTy - LLVM type for struct objc_property_list*. 459 const llvm::Type *ProtocolListPtrTy; 460 /// CategoryTy - LLVM type for struct objc_category. 461 const llvm::StructType *CategoryTy; 462 /// ClassTy - LLVM type for struct objc_class. 463 const llvm::StructType *ClassTy; 464 /// ClassPtrTy - LLVM type for struct objc_class *. 465 const llvm::Type *ClassPtrTy; 466 /// ClassExtensionTy - LLVM type for struct objc_class_ext. 467 const llvm::StructType *ClassExtensionTy; 468 /// ClassExtensionPtrTy - LLVM type for struct objc_class_ext *. 469 const llvm::Type *ClassExtensionPtrTy; 470 // IvarTy - LLVM type for struct objc_ivar. 471 const llvm::StructType *IvarTy; 472 /// IvarListTy - LLVM type for struct objc_ivar_list. 473 const llvm::Type *IvarListTy; 474 /// IvarListPtrTy - LLVM type for struct objc_ivar_list *. 475 const llvm::Type *IvarListPtrTy; 476 /// MethodListTy - LLVM type for struct objc_method_list. 477 const llvm::Type *MethodListTy; 478 /// MethodListPtrTy - LLVM type for struct objc_method_list *. 479 const llvm::Type *MethodListPtrTy; 480 481 /// ExceptionDataTy - LLVM type for struct _objc_exception_data. 482 const llvm::Type *ExceptionDataTy; 483 484 /// ExceptionTryEnterFn - LLVM objc_exception_try_enter function. 485 llvm::Constant *getExceptionTryEnterFn() { 486 std::vector<const llvm::Type*> Params; 487 Params.push_back(llvm::PointerType::getUnqual(ExceptionDataTy)); 488 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::VoidTy, 489 Params, false), 490 "objc_exception_try_enter"); 491 } 492 493 /// ExceptionTryExitFn - LLVM objc_exception_try_exit function. 494 llvm::Constant *getExceptionTryExitFn() { 495 std::vector<const llvm::Type*> Params; 496 Params.push_back(llvm::PointerType::getUnqual(ExceptionDataTy)); 497 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::VoidTy, 498 Params, false), 499 "objc_exception_try_exit"); 500 } 501 502 /// ExceptionExtractFn - LLVM objc_exception_extract function. 503 llvm::Constant *getExceptionExtractFn() { 504 std::vector<const llvm::Type*> Params; 505 Params.push_back(llvm::PointerType::getUnqual(ExceptionDataTy)); 506 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 507 Params, false), 508 "objc_exception_extract"); 509 510 } 511 512 /// ExceptionMatchFn - LLVM objc_exception_match function. 513 llvm::Constant *getExceptionMatchFn() { 514 std::vector<const llvm::Type*> Params; 515 Params.push_back(ClassPtrTy); 516 Params.push_back(ObjectPtrTy); 517 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::Int32Ty, 518 Params, false), 519 "objc_exception_match"); 520 521 } 522 523 /// SetJmpFn - LLVM _setjmp function. 524 llvm::Constant *getSetJmpFn() { 525 std::vector<const llvm::Type*> Params; 526 Params.push_back(llvm::PointerType::getUnqual(llvm::Type::Int32Ty)); 527 return 528 CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::Int32Ty, 529 Params, false), 530 "_setjmp"); 531 532 } 533 534public: 535 ObjCTypesHelper(CodeGen::CodeGenModule &cgm); 536 ~ObjCTypesHelper() {} 537}; 538 539/// ObjCNonFragileABITypesHelper - will have all types needed by objective-c's 540/// modern abi 541class ObjCNonFragileABITypesHelper : public ObjCCommonTypesHelper { 542public: 543 544 // MethodListnfABITy - LLVM for struct _method_list_t 545 const llvm::StructType *MethodListnfABITy; 546 547 // MethodListnfABIPtrTy - LLVM for struct _method_list_t* 548 const llvm::Type *MethodListnfABIPtrTy; 549 550 // ProtocolnfABITy = LLVM for struct _protocol_t 551 const llvm::StructType *ProtocolnfABITy; 552 553 // ProtocolnfABIPtrTy = LLVM for struct _protocol_t* 554 const llvm::Type *ProtocolnfABIPtrTy; 555 556 // ProtocolListnfABITy - LLVM for struct _objc_protocol_list 557 const llvm::StructType *ProtocolListnfABITy; 558 559 // ProtocolListnfABIPtrTy - LLVM for struct _objc_protocol_list* 560 const llvm::Type *ProtocolListnfABIPtrTy; 561 562 // ClassnfABITy - LLVM for struct _class_t 563 const llvm::StructType *ClassnfABITy; 564 565 // ClassnfABIPtrTy - LLVM for struct _class_t* 566 const llvm::Type *ClassnfABIPtrTy; 567 568 // IvarnfABITy - LLVM for struct _ivar_t 569 const llvm::StructType *IvarnfABITy; 570 571 // IvarListnfABITy - LLVM for struct _ivar_list_t 572 const llvm::StructType *IvarListnfABITy; 573 574 // IvarListnfABIPtrTy = LLVM for struct _ivar_list_t* 575 const llvm::Type *IvarListnfABIPtrTy; 576 577 // ClassRonfABITy - LLVM for struct _class_ro_t 578 const llvm::StructType *ClassRonfABITy; 579 580 // ImpnfABITy - LLVM for id (*)(id, SEL, ...) 581 const llvm::Type *ImpnfABITy; 582 583 // CategorynfABITy - LLVM for struct _category_t 584 const llvm::StructType *CategorynfABITy; 585 586 // New types for nonfragile abi messaging. 587 588 // MessageRefTy - LLVM for: 589 // struct _message_ref_t { 590 // IMP messenger; 591 // SEL name; 592 // }; 593 const llvm::StructType *MessageRefTy; 594 // MessageRefCTy - clang type for struct _message_ref_t 595 QualType MessageRefCTy; 596 597 // MessageRefPtrTy - LLVM for struct _message_ref_t* 598 const llvm::Type *MessageRefPtrTy; 599 // MessageRefCPtrTy - clang type for struct _message_ref_t* 600 QualType MessageRefCPtrTy; 601 602 // MessengerTy - Type of the messenger (shown as IMP above) 603 const llvm::FunctionType *MessengerTy; 604 605 // SuperMessageRefTy - LLVM for: 606 // struct _super_message_ref_t { 607 // SUPER_IMP messenger; 608 // SEL name; 609 // }; 610 const llvm::StructType *SuperMessageRefTy; 611 612 // SuperMessageRefPtrTy - LLVM for struct _super_message_ref_t* 613 const llvm::Type *SuperMessageRefPtrTy; 614 615 llvm::Constant *getMessageSendFixupFn() { 616 // id objc_msgSend_fixup(id, struct message_ref_t*, ...) 617 std::vector<const llvm::Type*> Params; 618 Params.push_back(ObjectPtrTy); 619 Params.push_back(MessageRefPtrTy); 620 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 621 Params, true), 622 "objc_msgSend_fixup"); 623 } 624 625 llvm::Constant *getMessageSendFpretFixupFn() { 626 // id objc_msgSend_fpret_fixup(id, struct message_ref_t*, ...) 627 std::vector<const llvm::Type*> Params; 628 Params.push_back(ObjectPtrTy); 629 Params.push_back(MessageRefPtrTy); 630 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 631 Params, true), 632 "objc_msgSend_fpret_fixup"); 633 } 634 635 llvm::Constant *getMessageSendStretFixupFn() { 636 // id objc_msgSend_stret_fixup(id, struct message_ref_t*, ...) 637 std::vector<const llvm::Type*> Params; 638 Params.push_back(ObjectPtrTy); 639 Params.push_back(MessageRefPtrTy); 640 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 641 Params, true), 642 "objc_msgSend_stret_fixup"); 643 } 644 645 llvm::Constant *getMessageSendIdFixupFn() { 646 // id objc_msgSendId_fixup(id, struct message_ref_t*, ...) 647 std::vector<const llvm::Type*> Params; 648 Params.push_back(ObjectPtrTy); 649 Params.push_back(MessageRefPtrTy); 650 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 651 Params, true), 652 "objc_msgSendId_fixup"); 653 } 654 655 llvm::Constant *getMessageSendIdStretFixupFn() { 656 // id objc_msgSendId_stret_fixup(id, struct message_ref_t*, ...) 657 std::vector<const llvm::Type*> Params; 658 Params.push_back(ObjectPtrTy); 659 Params.push_back(MessageRefPtrTy); 660 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 661 Params, true), 662 "objc_msgSendId_stret_fixup"); 663 } 664 llvm::Constant *getMessageSendSuper2FixupFn() { 665 // id objc_msgSendSuper2_fixup (struct objc_super *, 666 // struct _super_message_ref_t*, ...) 667 std::vector<const llvm::Type*> Params; 668 Params.push_back(SuperPtrTy); 669 Params.push_back(SuperMessageRefPtrTy); 670 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 671 Params, true), 672 "objc_msgSendSuper2_fixup"); 673 } 674 675 llvm::Constant *getMessageSendSuper2StretFixupFn() { 676 // id objc_msgSendSuper2_stret_fixup(struct objc_super *, 677 // struct _super_message_ref_t*, ...) 678 std::vector<const llvm::Type*> Params; 679 Params.push_back(SuperPtrTy); 680 Params.push_back(SuperMessageRefPtrTy); 681 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, 682 Params, true), 683 "objc_msgSendSuper2_stret_fixup"); 684 } 685 686 687 688 /// EHPersonalityPtr - LLVM value for an i8* to the Objective-C 689 /// exception personality function. 690 llvm::Value *getEHPersonalityPtr() { 691 llvm::Constant *Personality = 692 CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::Int32Ty, 693 std::vector<const llvm::Type*>(), 694 true), 695 "__objc_personality_v0"); 696 return llvm::ConstantExpr::getBitCast(Personality, Int8PtrTy); 697 } 698 699 llvm::Constant *getUnwindResumeOrRethrowFn() { 700 std::vector<const llvm::Type*> Params; 701 Params.push_back(Int8PtrTy); 702 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::VoidTy, 703 Params, false), 704 "_Unwind_Resume_or_Rethrow"); 705 } 706 707 llvm::Constant *getObjCEndCatchFn() { 708 std::vector<const llvm::Type*> Params; 709 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::VoidTy, 710 Params, false), 711 "objc_end_catch"); 712 713 } 714 715 llvm::Constant *getObjCBeginCatchFn() { 716 std::vector<const llvm::Type*> Params; 717 Params.push_back(Int8PtrTy); 718 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(Int8PtrTy, 719 Params, false), 720 "objc_begin_catch"); 721 } 722 723 const llvm::StructType *EHTypeTy; 724 const llvm::Type *EHTypePtrTy; 725 726 ObjCNonFragileABITypesHelper(CodeGen::CodeGenModule &cgm); 727 ~ObjCNonFragileABITypesHelper(){} 728}; 729 730class CGObjCCommonMac : public CodeGen::CGObjCRuntime { 731public: 732 // FIXME - accessibility 733 class GC_IVAR { 734 public: 735 unsigned ivar_bytepos; 736 unsigned ivar_size; 737 GC_IVAR(unsigned bytepos = 0, unsigned size = 0) 738 : ivar_bytepos(bytepos), ivar_size(size) {} 739 740 // Allow sorting based on byte pos. 741 bool operator<(const GC_IVAR &b) const { 742 return ivar_bytepos < b.ivar_bytepos; 743 } 744 }; 745 746 class SKIP_SCAN { 747 public: 748 unsigned skip; 749 unsigned scan; 750 SKIP_SCAN(unsigned _skip = 0, unsigned _scan = 0) 751 : skip(_skip), scan(_scan) {} 752 }; 753 754protected: 755 CodeGen::CodeGenModule &CGM; 756 // FIXME! May not be needing this after all. 757 unsigned ObjCABI; 758 759 // gc ivar layout bitmap calculation helper caches. 760 llvm::SmallVector<GC_IVAR, 16> SkipIvars; 761 llvm::SmallVector<GC_IVAR, 16> IvarsInfo; 762 763 /// LazySymbols - Symbols to generate a lazy reference for. See 764 /// DefinedSymbols and FinishModule(). 765 std::set<IdentifierInfo*> LazySymbols; 766 767 /// DefinedSymbols - External symbols which are defined by this 768 /// module. The symbols in this list and LazySymbols are used to add 769 /// special linker symbols which ensure that Objective-C modules are 770 /// linked properly. 771 std::set<IdentifierInfo*> DefinedSymbols; 772 773 /// ClassNames - uniqued class names. 774 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> ClassNames; 775 776 /// MethodVarNames - uniqued method variable names. 777 llvm::DenseMap<Selector, llvm::GlobalVariable*> MethodVarNames; 778 779 /// MethodVarTypes - uniqued method type signatures. We have to use 780 /// a StringMap here because have no other unique reference. 781 llvm::StringMap<llvm::GlobalVariable*> MethodVarTypes; 782 783 /// MethodDefinitions - map of methods which have been defined in 784 /// this translation unit. 785 llvm::DenseMap<const ObjCMethodDecl*, llvm::Function*> MethodDefinitions; 786 787 /// PropertyNames - uniqued method variable names. 788 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> PropertyNames; 789 790 /// ClassReferences - uniqued class references. 791 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> ClassReferences; 792 793 /// SelectorReferences - uniqued selector references. 794 llvm::DenseMap<Selector, llvm::GlobalVariable*> SelectorReferences; 795 796 /// Protocols - Protocols for which an objc_protocol structure has 797 /// been emitted. Forward declarations are handled by creating an 798 /// empty structure whose initializer is filled in when/if defined. 799 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> Protocols; 800 801 /// DefinedProtocols - Protocols which have actually been 802 /// defined. We should not need this, see FIXME in GenerateProtocol. 803 llvm::DenseSet<IdentifierInfo*> DefinedProtocols; 804 805 /// DefinedClasses - List of defined classes. 806 std::vector<llvm::GlobalValue*> DefinedClasses; 807 808 /// DefinedNonLazyClasses - List of defined "non-lazy" classes. 809 std::vector<llvm::GlobalValue*> DefinedNonLazyClasses; 810 811 /// DefinedCategories - List of defined categories. 812 std::vector<llvm::GlobalValue*> DefinedCategories; 813 814 /// DefinedNonLazyCategories - List of defined "non-lazy" categories. 815 std::vector<llvm::GlobalValue*> DefinedNonLazyCategories; 816 817 /// UsedGlobals - List of globals to pack into the llvm.used metadata 818 /// to prevent them from being clobbered. 819 std::vector<llvm::GlobalVariable*> UsedGlobals; 820 821 /// GetNameForMethod - Return a name for the given method. 822 /// \param[out] NameOut - The return value. 823 void GetNameForMethod(const ObjCMethodDecl *OMD, 824 const ObjCContainerDecl *CD, 825 std::string &NameOut); 826 827 /// GetMethodVarName - Return a unique constant for the given 828 /// selector's name. The return value has type char *. 829 llvm::Constant *GetMethodVarName(Selector Sel); 830 llvm::Constant *GetMethodVarName(IdentifierInfo *Ident); 831 llvm::Constant *GetMethodVarName(const std::string &Name); 832 833 /// GetMethodVarType - Return a unique constant for the given 834 /// selector's name. The return value has type char *. 835 836 // FIXME: This is a horrible name. 837 llvm::Constant *GetMethodVarType(const ObjCMethodDecl *D); 838 llvm::Constant *GetMethodVarType(const FieldDecl *D); 839 840 /// GetPropertyName - Return a unique constant for the given 841 /// name. The return value has type char *. 842 llvm::Constant *GetPropertyName(IdentifierInfo *Ident); 843 844 // FIXME: This can be dropped once string functions are unified. 845 llvm::Constant *GetPropertyTypeString(const ObjCPropertyDecl *PD, 846 const Decl *Container); 847 848 /// GetClassName - Return a unique constant for the given selector's 849 /// name. The return value has type char *. 850 llvm::Constant *GetClassName(IdentifierInfo *Ident); 851 852 /// BuildIvarLayout - Builds ivar layout bitmap for the class 853 /// implementation for the __strong or __weak case. 854 /// 855 llvm::Constant *BuildIvarLayout(const ObjCImplementationDecl *OI, 856 bool ForStrongLayout); 857 858 void BuildAggrIvarRecordLayout(const RecordType *RT, 859 unsigned int BytePos, bool ForStrongLayout, 860 bool &HasUnion); 861 void BuildAggrIvarLayout(const ObjCImplementationDecl *OI, 862 const llvm::StructLayout *Layout, 863 const RecordDecl *RD, 864 const llvm::SmallVectorImpl<FieldDecl*> &RecFields, 865 unsigned int BytePos, bool ForStrongLayout, 866 bool &HasUnion); 867 868 /// GetIvarLayoutName - Returns a unique constant for the given 869 /// ivar layout bitmap. 870 llvm::Constant *GetIvarLayoutName(IdentifierInfo *Ident, 871 const ObjCCommonTypesHelper &ObjCTypes); 872 873 /// EmitPropertyList - Emit the given property list. The return 874 /// value has type PropertyListPtrTy. 875 llvm::Constant *EmitPropertyList(const std::string &Name, 876 const Decl *Container, 877 const ObjCContainerDecl *OCD, 878 const ObjCCommonTypesHelper &ObjCTypes); 879 880 /// GetProtocolRef - Return a reference to the internal protocol 881 /// description, creating an empty one if it has not been 882 /// defined. The return value has type ProtocolPtrTy. 883 llvm::Constant *GetProtocolRef(const ObjCProtocolDecl *PD); 884 885 /// CreateMetadataVar - Create a global variable with internal 886 /// linkage for use by the Objective-C runtime. 887 /// 888 /// This is a convenience wrapper which not only creates the 889 /// variable, but also sets the section and alignment and adds the 890 /// global to the UsedGlobals list. 891 /// 892 /// \param Name - The variable name. 893 /// \param Init - The variable initializer; this is also used to 894 /// define the type of the variable. 895 /// \param Section - The section the variable should go into, or 0. 896 /// \param Align - The alignment for the variable, or 0. 897 /// \param AddToUsed - Whether the variable should be added to 898 /// "llvm.used". 899 llvm::GlobalVariable *CreateMetadataVar(const std::string &Name, 900 llvm::Constant *Init, 901 const char *Section, 902 unsigned Align, 903 bool AddToUsed); 904 905 CodeGen::RValue EmitLegacyMessageSend(CodeGen::CodeGenFunction &CGF, 906 QualType ResultType, 907 llvm::Value *Sel, 908 llvm::Value *Arg0, 909 QualType Arg0Ty, 910 bool IsSuper, 911 const CallArgList &CallArgs, 912 const ObjCCommonTypesHelper &ObjCTypes); 913 914 virtual void MergeMetadataGlobals(std::vector<llvm::Constant*> &UsedArray); 915 916public: 917 CGObjCCommonMac(CodeGen::CodeGenModule &cgm) : CGM(cgm) 918 { } 919 920 virtual llvm::Constant *GenerateConstantString(const ObjCStringLiteral *SL); 921 922 virtual llvm::Function *GenerateMethod(const ObjCMethodDecl *OMD, 923 const ObjCContainerDecl *CD=0); 924 925 virtual void GenerateProtocol(const ObjCProtocolDecl *PD); 926 927 /// GetOrEmitProtocol - Get the protocol object for the given 928 /// declaration, emitting it if necessary. The return value has type 929 /// ProtocolPtrTy. 930 virtual llvm::Constant *GetOrEmitProtocol(const ObjCProtocolDecl *PD)=0; 931 932 /// GetOrEmitProtocolRef - Get a forward reference to the protocol 933 /// object for the given declaration, emitting it if needed. These 934 /// forward references will be filled in with empty bodies if no 935 /// definition is seen. The return value has type ProtocolPtrTy. 936 virtual llvm::Constant *GetOrEmitProtocolRef(const ObjCProtocolDecl *PD)=0; 937}; 938 939class CGObjCMac : public CGObjCCommonMac { 940private: 941 ObjCTypesHelper ObjCTypes; 942 /// EmitImageInfo - Emit the image info marker used to encode some module 943 /// level information. 944 void EmitImageInfo(); 945 946 /// EmitModuleInfo - Another marker encoding module level 947 /// information. 948 void EmitModuleInfo(); 949 950 /// EmitModuleSymols - Emit module symbols, the list of defined 951 /// classes and categories. The result has type SymtabPtrTy. 952 llvm::Constant *EmitModuleSymbols(); 953 954 /// FinishModule - Write out global data structures at the end of 955 /// processing a translation unit. 956 void FinishModule(); 957 958 /// EmitClassExtension - Generate the class extension structure used 959 /// to store the weak ivar layout and properties. The return value 960 /// has type ClassExtensionPtrTy. 961 llvm::Constant *EmitClassExtension(const ObjCImplementationDecl *ID); 962 963 /// EmitClassRef - Return a Value*, of type ObjCTypes.ClassPtrTy, 964 /// for the given class. 965 llvm::Value *EmitClassRef(CGBuilderTy &Builder, 966 const ObjCInterfaceDecl *ID); 967 968 CodeGen::RValue EmitMessageSend(CodeGen::CodeGenFunction &CGF, 969 QualType ResultType, 970 Selector Sel, 971 llvm::Value *Arg0, 972 QualType Arg0Ty, 973 bool IsSuper, 974 const CallArgList &CallArgs); 975 976 /// EmitIvarList - Emit the ivar list for the given 977 /// implementation. If ForClass is true the list of class ivars 978 /// (i.e. metaclass ivars) is emitted, otherwise the list of 979 /// interface ivars will be emitted. The return value has type 980 /// IvarListPtrTy. 981 llvm::Constant *EmitIvarList(const ObjCImplementationDecl *ID, 982 bool ForClass); 983 984 /// EmitMetaClass - Emit a forward reference to the class structure 985 /// for the metaclass of the given interface. The return value has 986 /// type ClassPtrTy. 987 llvm::Constant *EmitMetaClassRef(const ObjCInterfaceDecl *ID); 988 989 /// EmitMetaClass - Emit a class structure for the metaclass of the 990 /// given implementation. The return value has type ClassPtrTy. 991 llvm::Constant *EmitMetaClass(const ObjCImplementationDecl *ID, 992 llvm::Constant *Protocols, 993 const ConstantVector &Methods); 994 995 llvm::Constant *GetMethodConstant(const ObjCMethodDecl *MD); 996 997 llvm::Constant *GetMethodDescriptionConstant(const ObjCMethodDecl *MD); 998 999 /// EmitMethodList - Emit the method list for the given 1000 /// implementation. The return value has type MethodListPtrTy. 1001 llvm::Constant *EmitMethodList(const std::string &Name, 1002 const char *Section, 1003 const ConstantVector &Methods); 1004 1005 /// EmitMethodDescList - Emit a method description list for a list of 1006 /// method declarations. 1007 /// - TypeName: The name for the type containing the methods. 1008 /// - IsProtocol: True iff these methods are for a protocol. 1009 /// - ClassMethds: True iff these are class methods. 1010 /// - Required: When true, only "required" methods are 1011 /// listed. Similarly, when false only "optional" methods are 1012 /// listed. For classes this should always be true. 1013 /// - begin, end: The method list to output. 1014 /// 1015 /// The return value has type MethodDescriptionListPtrTy. 1016 llvm::Constant *EmitMethodDescList(const std::string &Name, 1017 const char *Section, 1018 const ConstantVector &Methods); 1019 1020 /// GetOrEmitProtocol - Get the protocol object for the given 1021 /// declaration, emitting it if necessary. The return value has type 1022 /// ProtocolPtrTy. 1023 virtual llvm::Constant *GetOrEmitProtocol(const ObjCProtocolDecl *PD); 1024 1025 /// GetOrEmitProtocolRef - Get a forward reference to the protocol 1026 /// object for the given declaration, emitting it if needed. These 1027 /// forward references will be filled in with empty bodies if no 1028 /// definition is seen. The return value has type ProtocolPtrTy. 1029 virtual llvm::Constant *GetOrEmitProtocolRef(const ObjCProtocolDecl *PD); 1030 1031 /// EmitProtocolExtension - Generate the protocol extension 1032 /// structure used to store optional instance and class methods, and 1033 /// protocol properties. The return value has type 1034 /// ProtocolExtensionPtrTy. 1035 llvm::Constant * 1036 EmitProtocolExtension(const ObjCProtocolDecl *PD, 1037 const ConstantVector &OptInstanceMethods, 1038 const ConstantVector &OptClassMethods); 1039 1040 /// EmitProtocolList - Generate the list of referenced 1041 /// protocols. The return value has type ProtocolListPtrTy. 1042 llvm::Constant *EmitProtocolList(const std::string &Name, 1043 ObjCProtocolDecl::protocol_iterator begin, 1044 ObjCProtocolDecl::protocol_iterator end); 1045 1046 /// EmitSelector - Return a Value*, of type ObjCTypes.SelectorPtrTy, 1047 /// for the given selector. 1048 llvm::Value *EmitSelector(CGBuilderTy &Builder, Selector Sel); 1049 1050 public: 1051 CGObjCMac(CodeGen::CodeGenModule &cgm); 1052 1053 virtual llvm::Function *ModuleInitFunction(); 1054 1055 virtual CodeGen::RValue GenerateMessageSend(CodeGen::CodeGenFunction &CGF, 1056 QualType ResultType, 1057 Selector Sel, 1058 llvm::Value *Receiver, 1059 bool IsClassMessage, 1060 const CallArgList &CallArgs, 1061 const ObjCMethodDecl *Method); 1062 1063 virtual CodeGen::RValue 1064 GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF, 1065 QualType ResultType, 1066 Selector Sel, 1067 const ObjCInterfaceDecl *Class, 1068 bool isCategoryImpl, 1069 llvm::Value *Receiver, 1070 bool IsClassMessage, 1071 const CallArgList &CallArgs); 1072 1073 virtual llvm::Value *GetClass(CGBuilderTy &Builder, 1074 const ObjCInterfaceDecl *ID); 1075 1076 virtual llvm::Value *GetSelector(CGBuilderTy &Builder, Selector Sel); 1077 1078 /// The NeXT/Apple runtimes do not support typed selectors; just emit an 1079 /// untyped one. 1080 virtual llvm::Value *GetSelector(CGBuilderTy &Builder, 1081 const ObjCMethodDecl *Method); 1082 1083 virtual void GenerateCategory(const ObjCCategoryImplDecl *CMD); 1084 1085 virtual void GenerateClass(const ObjCImplementationDecl *ClassDecl); 1086 1087 virtual llvm::Value *GenerateProtocolRef(CGBuilderTy &Builder, 1088 const ObjCProtocolDecl *PD); 1089 1090 virtual llvm::Constant *GetPropertyGetFunction(); 1091 virtual llvm::Constant *GetPropertySetFunction(); 1092 virtual llvm::Constant *EnumerationMutationFunction(); 1093 1094 virtual void EmitTryOrSynchronizedStmt(CodeGen::CodeGenFunction &CGF, 1095 const Stmt &S); 1096 virtual void EmitThrowStmt(CodeGen::CodeGenFunction &CGF, 1097 const ObjCAtThrowStmt &S); 1098 virtual llvm::Value * EmitObjCWeakRead(CodeGen::CodeGenFunction &CGF, 1099 llvm::Value *AddrWeakObj); 1100 virtual void EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF, 1101 llvm::Value *src, llvm::Value *dst); 1102 virtual void EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF, 1103 llvm::Value *src, llvm::Value *dest); 1104 virtual void EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF, 1105 llvm::Value *src, llvm::Value *dest); 1106 virtual void EmitObjCStrongCastAssign(CodeGen::CodeGenFunction &CGF, 1107 llvm::Value *src, llvm::Value *dest); 1108 1109 virtual LValue EmitObjCValueForIvar(CodeGen::CodeGenFunction &CGF, 1110 QualType ObjectTy, 1111 llvm::Value *BaseValue, 1112 const ObjCIvarDecl *Ivar, 1113 unsigned CVRQualifiers); 1114 virtual llvm::Value *EmitIvarOffset(CodeGen::CodeGenFunction &CGF, 1115 const ObjCInterfaceDecl *Interface, 1116 const ObjCIvarDecl *Ivar); 1117}; 1118 1119class CGObjCNonFragileABIMac : public CGObjCCommonMac { 1120private: 1121 ObjCNonFragileABITypesHelper ObjCTypes; 1122 llvm::GlobalVariable* ObjCEmptyCacheVar; 1123 llvm::GlobalVariable* ObjCEmptyVtableVar; 1124 1125 /// SuperClassReferences - uniqued super class references. 1126 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> SuperClassReferences; 1127 1128 /// MetaClassReferences - uniqued meta class references. 1129 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> MetaClassReferences; 1130 1131 /// EHTypeReferences - uniqued class ehtype references. 1132 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> EHTypeReferences; 1133 1134 /// NonLegacyDispatchMethods - List of methods for which we do *not* generate 1135 /// legacy messaging dispatch. 1136 llvm::DenseSet<Selector> NonLegacyDispatchMethods; 1137 1138 /// LegacyDispatchedSelector - Returns true if SEL is not in the list of 1139 /// NonLegacyDispatchMethods; false otherwise. 1140 bool LegacyDispatchedSelector(Selector Sel); 1141 1142 /// FinishNonFragileABIModule - Write out global data structures at the end of 1143 /// processing a translation unit. 1144 void FinishNonFragileABIModule(); 1145 1146 /// AddModuleClassList - Add the given list of class pointers to the 1147 /// module with the provided symbol and section names. 1148 void AddModuleClassList(const std::vector<llvm::GlobalValue*> &Container, 1149 const char *SymbolName, 1150 const char *SectionName); 1151 1152 llvm::GlobalVariable * BuildClassRoTInitializer(unsigned flags, 1153 unsigned InstanceStart, 1154 unsigned InstanceSize, 1155 const ObjCImplementationDecl *ID); 1156 llvm::GlobalVariable * BuildClassMetaData(std::string &ClassName, 1157 llvm::Constant *IsAGV, 1158 llvm::Constant *SuperClassGV, 1159 llvm::Constant *ClassRoGV, 1160 bool HiddenVisibility); 1161 1162 llvm::Constant *GetMethodConstant(const ObjCMethodDecl *MD); 1163 1164 llvm::Constant *GetMethodDescriptionConstant(const ObjCMethodDecl *MD); 1165 1166 /// EmitMethodList - Emit the method list for the given 1167 /// implementation. The return value has type MethodListnfABITy. 1168 llvm::Constant *EmitMethodList(const std::string &Name, 1169 const char *Section, 1170 const ConstantVector &Methods); 1171 /// EmitIvarList - Emit the ivar list for the given 1172 /// implementation. If ForClass is true the list of class ivars 1173 /// (i.e. metaclass ivars) is emitted, otherwise the list of 1174 /// interface ivars will be emitted. The return value has type 1175 /// IvarListnfABIPtrTy. 1176 llvm::Constant *EmitIvarList(const ObjCImplementationDecl *ID); 1177 1178 llvm::Constant *EmitIvarOffsetVar(const ObjCInterfaceDecl *ID, 1179 const ObjCIvarDecl *Ivar, 1180 unsigned long int offset); 1181 1182 /// GetOrEmitProtocol - Get the protocol object for the given 1183 /// declaration, emitting it if necessary. The return value has type 1184 /// ProtocolPtrTy. 1185 virtual llvm::Constant *GetOrEmitProtocol(const ObjCProtocolDecl *PD); 1186 1187 /// GetOrEmitProtocolRef - Get a forward reference to the protocol 1188 /// object for the given declaration, emitting it if needed. These 1189 /// forward references will be filled in with empty bodies if no 1190 /// definition is seen. The return value has type ProtocolPtrTy. 1191 virtual llvm::Constant *GetOrEmitProtocolRef(const ObjCProtocolDecl *PD); 1192 1193 /// EmitProtocolList - Generate the list of referenced 1194 /// protocols. The return value has type ProtocolListPtrTy. 1195 llvm::Constant *EmitProtocolList(const std::string &Name, 1196 ObjCProtocolDecl::protocol_iterator begin, 1197 ObjCProtocolDecl::protocol_iterator end); 1198 1199 CodeGen::RValue EmitMessageSend(CodeGen::CodeGenFunction &CGF, 1200 QualType ResultType, 1201 Selector Sel, 1202 llvm::Value *Receiver, 1203 QualType Arg0Ty, 1204 bool IsSuper, 1205 const CallArgList &CallArgs); 1206 1207 /// GetClassGlobal - Return the global variable for the Objective-C 1208 /// class of the given name. 1209 llvm::GlobalVariable *GetClassGlobal(const std::string &Name); 1210 1211 /// EmitClassRef - Return a Value*, of type ObjCTypes.ClassPtrTy, 1212 /// for the given class reference. 1213 llvm::Value *EmitClassRef(CGBuilderTy &Builder, 1214 const ObjCInterfaceDecl *ID); 1215 1216 /// EmitSuperClassRef - Return a Value*, of type ObjCTypes.ClassPtrTy, 1217 /// for the given super class reference. 1218 llvm::Value *EmitSuperClassRef(CGBuilderTy &Builder, 1219 const ObjCInterfaceDecl *ID); 1220 1221 /// EmitMetaClassRef - Return a Value * of the address of _class_t 1222 /// meta-data 1223 llvm::Value *EmitMetaClassRef(CGBuilderTy &Builder, 1224 const ObjCInterfaceDecl *ID); 1225 1226 /// ObjCIvarOffsetVariable - Returns the ivar offset variable for 1227 /// the given ivar. 1228 /// 1229 llvm::GlobalVariable * ObjCIvarOffsetVariable( 1230 const ObjCInterfaceDecl *ID, 1231 const ObjCIvarDecl *Ivar); 1232 1233 /// EmitSelector - Return a Value*, of type ObjCTypes.SelectorPtrTy, 1234 /// for the given selector. 1235 llvm::Value *EmitSelector(CGBuilderTy &Builder, Selector Sel); 1236 1237 /// GetInterfaceEHType - Get the cached ehtype for the given Objective-C 1238 /// interface. The return value has type EHTypePtrTy. 1239 llvm::Value *GetInterfaceEHType(const ObjCInterfaceDecl *ID, 1240 bool ForDefinition); 1241 1242 const char *getMetaclassSymbolPrefix() const { 1243 return "OBJC_METACLASS_$_"; 1244 } 1245 1246 const char *getClassSymbolPrefix() const { 1247 return "OBJC_CLASS_$_"; 1248 } 1249 1250 void GetClassSizeInfo(const ObjCImplementationDecl *OID, 1251 uint32_t &InstanceStart, 1252 uint32_t &InstanceSize); 1253 1254 // Shamelessly stolen from Analysis/CFRefCount.cpp 1255 Selector GetNullarySelector(const char* name) const { 1256 IdentifierInfo* II = &CGM.getContext().Idents.get(name); 1257 return CGM.getContext().Selectors.getSelector(0, &II); 1258 } 1259 1260 Selector GetUnarySelector(const char* name) const { 1261 IdentifierInfo* II = &CGM.getContext().Idents.get(name); 1262 return CGM.getContext().Selectors.getSelector(1, &II); 1263 } 1264 1265 /// ImplementationIsNonLazy - Check whether the given category or 1266 /// class implementation is "non-lazy". 1267 bool ImplementationIsNonLazy(const ObjCImplDecl *OD) const; 1268 1269public: 1270 CGObjCNonFragileABIMac(CodeGen::CodeGenModule &cgm); 1271 // FIXME. All stubs for now! 1272 virtual llvm::Function *ModuleInitFunction(); 1273 1274 virtual CodeGen::RValue GenerateMessageSend(CodeGen::CodeGenFunction &CGF, 1275 QualType ResultType, 1276 Selector Sel, 1277 llvm::Value *Receiver, 1278 bool IsClassMessage, 1279 const CallArgList &CallArgs, 1280 const ObjCMethodDecl *Method); 1281 1282 virtual CodeGen::RValue 1283 GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF, 1284 QualType ResultType, 1285 Selector Sel, 1286 const ObjCInterfaceDecl *Class, 1287 bool isCategoryImpl, 1288 llvm::Value *Receiver, 1289 bool IsClassMessage, 1290 const CallArgList &CallArgs); 1291 1292 virtual llvm::Value *GetClass(CGBuilderTy &Builder, 1293 const ObjCInterfaceDecl *ID); 1294 1295 virtual llvm::Value *GetSelector(CGBuilderTy &Builder, Selector Sel) 1296 { return EmitSelector(Builder, Sel); } 1297 1298 /// The NeXT/Apple runtimes do not support typed selectors; just emit an 1299 /// untyped one. 1300 virtual llvm::Value *GetSelector(CGBuilderTy &Builder, 1301 const ObjCMethodDecl *Method) 1302 { return EmitSelector(Builder, Method->getSelector()); } 1303 1304 virtual void GenerateCategory(const ObjCCategoryImplDecl *CMD); 1305 1306 virtual void GenerateClass(const ObjCImplementationDecl *ClassDecl); 1307 virtual llvm::Value *GenerateProtocolRef(CGBuilderTy &Builder, 1308 const ObjCProtocolDecl *PD); 1309 1310 virtual llvm::Constant *GetPropertyGetFunction() { 1311 return ObjCTypes.getGetPropertyFn(); 1312 } 1313 virtual llvm::Constant *GetPropertySetFunction() { 1314 return ObjCTypes.getSetPropertyFn(); 1315 } 1316 virtual llvm::Constant *EnumerationMutationFunction() { 1317 return ObjCTypes.getEnumerationMutationFn(); 1318 } 1319 1320 virtual void EmitTryOrSynchronizedStmt(CodeGen::CodeGenFunction &CGF, 1321 const Stmt &S); 1322 virtual void EmitThrowStmt(CodeGen::CodeGenFunction &CGF, 1323 const ObjCAtThrowStmt &S); 1324 virtual llvm::Value * EmitObjCWeakRead(CodeGen::CodeGenFunction &CGF, 1325 llvm::Value *AddrWeakObj); 1326 virtual void EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF, 1327 llvm::Value *src, llvm::Value *dst); 1328 virtual void EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF, 1329 llvm::Value *src, llvm::Value *dest); 1330 virtual void EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF, 1331 llvm::Value *src, llvm::Value *dest); 1332 virtual void EmitObjCStrongCastAssign(CodeGen::CodeGenFunction &CGF, 1333 llvm::Value *src, llvm::Value *dest); 1334 virtual LValue EmitObjCValueForIvar(CodeGen::CodeGenFunction &CGF, 1335 QualType ObjectTy, 1336 llvm::Value *BaseValue, 1337 const ObjCIvarDecl *Ivar, 1338 unsigned CVRQualifiers); 1339 virtual llvm::Value *EmitIvarOffset(CodeGen::CodeGenFunction &CGF, 1340 const ObjCInterfaceDecl *Interface, 1341 const ObjCIvarDecl *Ivar); 1342}; 1343 1344} // end anonymous namespace 1345 1346/* *** Helper Functions *** */ 1347 1348/// getConstantGEP() - Help routine to construct simple GEPs. 1349static llvm::Constant *getConstantGEP(llvm::Constant *C, 1350 unsigned idx0, 1351 unsigned idx1) { 1352 llvm::Value *Idxs[] = { 1353 llvm::ConstantInt::get(llvm::Type::Int32Ty, idx0), 1354 llvm::ConstantInt::get(llvm::Type::Int32Ty, idx1) 1355 }; 1356 return llvm::ConstantExpr::getGetElementPtr(C, Idxs, 2); 1357} 1358 1359/// hasObjCExceptionAttribute - Return true if this class or any super 1360/// class has the __objc_exception__ attribute. 1361static bool hasObjCExceptionAttribute(ASTContext &Context, 1362 const ObjCInterfaceDecl *OID) { 1363 if (OID->hasAttr<ObjCExceptionAttr>()) 1364 return true; 1365 if (const ObjCInterfaceDecl *Super = OID->getSuperClass()) 1366 return hasObjCExceptionAttribute(Context, Super); 1367 return false; 1368} 1369 1370/* *** CGObjCMac Public Interface *** */ 1371 1372CGObjCMac::CGObjCMac(CodeGen::CodeGenModule &cgm) : CGObjCCommonMac(cgm), 1373 ObjCTypes(cgm) 1374{ 1375 ObjCABI = 1; 1376 EmitImageInfo(); 1377} 1378 1379/// GetClass - Return a reference to the class for the given interface 1380/// decl. 1381llvm::Value *CGObjCMac::GetClass(CGBuilderTy &Builder, 1382 const ObjCInterfaceDecl *ID) { 1383 return EmitClassRef(Builder, ID); 1384} 1385 1386/// GetSelector - Return the pointer to the unique'd string for this selector. 1387llvm::Value *CGObjCMac::GetSelector(CGBuilderTy &Builder, Selector Sel) { 1388 return EmitSelector(Builder, Sel); 1389} 1390llvm::Value *CGObjCMac::GetSelector(CGBuilderTy &Builder, const ObjCMethodDecl 1391 *Method) { 1392 return EmitSelector(Builder, Method->getSelector()); 1393} 1394 1395/// Generate a constant CFString object. 1396/* 1397 struct __builtin_CFString { 1398 const int *isa; // point to __CFConstantStringClassReference 1399 int flags; 1400 const char *str; 1401 long length; 1402 }; 1403*/ 1404 1405llvm::Constant *CGObjCCommonMac::GenerateConstantString( 1406 const ObjCStringLiteral *SL) { 1407 return CGM.GetAddrOfConstantCFString(SL->getString()); 1408} 1409 1410/// Generates a message send where the super is the receiver. This is 1411/// a message send to self with special delivery semantics indicating 1412/// which class's method should be called. 1413CodeGen::RValue 1414CGObjCMac::GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF, 1415 QualType ResultType, 1416 Selector Sel, 1417 const ObjCInterfaceDecl *Class, 1418 bool isCategoryImpl, 1419 llvm::Value *Receiver, 1420 bool IsClassMessage, 1421 const CodeGen::CallArgList &CallArgs) { 1422 // Create and init a super structure; this is a (receiver, class) 1423 // pair we will pass to objc_msgSendSuper. 1424 llvm::Value *ObjCSuper = 1425 CGF.Builder.CreateAlloca(ObjCTypes.SuperTy, 0, "objc_super"); 1426 llvm::Value *ReceiverAsObject = 1427 CGF.Builder.CreateBitCast(Receiver, ObjCTypes.ObjectPtrTy); 1428 CGF.Builder.CreateStore(ReceiverAsObject, 1429 CGF.Builder.CreateStructGEP(ObjCSuper, 0)); 1430 1431 // If this is a class message the metaclass is passed as the target. 1432 llvm::Value *Target; 1433 if (IsClassMessage) { 1434 if (isCategoryImpl) { 1435 // Message sent to 'super' in a class method defined in a category 1436 // implementation requires an odd treatment. 1437 // If we are in a class method, we must retrieve the 1438 // _metaclass_ for the current class, pointed at by 1439 // the class's "isa" pointer. The following assumes that 1440 // isa" is the first ivar in a class (which it must be). 1441 Target = EmitClassRef(CGF.Builder, Class->getSuperClass()); 1442 Target = CGF.Builder.CreateStructGEP(Target, 0); 1443 Target = CGF.Builder.CreateLoad(Target); 1444 } 1445 else { 1446 llvm::Value *MetaClassPtr = EmitMetaClassRef(Class); 1447 llvm::Value *SuperPtr = CGF.Builder.CreateStructGEP(MetaClassPtr, 1); 1448 llvm::Value *Super = CGF.Builder.CreateLoad(SuperPtr); 1449 Target = Super; 1450 } 1451 } else { 1452 Target = EmitClassRef(CGF.Builder, Class->getSuperClass()); 1453 } 1454 // FIXME: We shouldn't need to do this cast, rectify the ASTContext and 1455 // ObjCTypes types. 1456 const llvm::Type *ClassTy = 1457 CGM.getTypes().ConvertType(CGF.getContext().getObjCClassType()); 1458 Target = CGF.Builder.CreateBitCast(Target, ClassTy); 1459 CGF.Builder.CreateStore(Target, 1460 CGF.Builder.CreateStructGEP(ObjCSuper, 1)); 1461 return EmitLegacyMessageSend(CGF, ResultType, 1462 EmitSelector(CGF.Builder, Sel), 1463 ObjCSuper, ObjCTypes.SuperPtrCTy, 1464 true, CallArgs, ObjCTypes); 1465} 1466 1467/// Generate code for a message send expression. 1468CodeGen::RValue CGObjCMac::GenerateMessageSend(CodeGen::CodeGenFunction &CGF, 1469 QualType ResultType, 1470 Selector Sel, 1471 llvm::Value *Receiver, 1472 bool IsClassMessage, 1473 const CallArgList &CallArgs, 1474 const ObjCMethodDecl *Method) { 1475 return EmitLegacyMessageSend(CGF, ResultType, 1476 EmitSelector(CGF.Builder, Sel), 1477 Receiver, CGF.getContext().getObjCIdType(), 1478 false, CallArgs, ObjCTypes); 1479} 1480 1481CodeGen::RValue CGObjCCommonMac::EmitLegacyMessageSend( 1482 CodeGen::CodeGenFunction &CGF, 1483 QualType ResultType, 1484 llvm::Value *Sel, 1485 llvm::Value *Arg0, 1486 QualType Arg0Ty, 1487 bool IsSuper, 1488 const CallArgList &CallArgs, 1489 const ObjCCommonTypesHelper &ObjCTypes) { 1490 CallArgList ActualArgs; 1491 if (!IsSuper) 1492 Arg0 = CGF.Builder.CreateBitCast(Arg0, ObjCTypes.ObjectPtrTy, "tmp"); 1493 ActualArgs.push_back(std::make_pair(RValue::get(Arg0), Arg0Ty)); 1494 ActualArgs.push_back(std::make_pair(RValue::get(Sel), 1495 CGF.getContext().getObjCSelType())); 1496 ActualArgs.insert(ActualArgs.end(), CallArgs.begin(), CallArgs.end()); 1497 1498 CodeGenTypes &Types = CGM.getTypes(); 1499 const CGFunctionInfo &FnInfo = Types.getFunctionInfo(ResultType, ActualArgs); 1500 // In 64bit ABI, type must be assumed VARARG. In 32bit abi, 1501 // it seems not to matter. 1502 const llvm::FunctionType *FTy = Types.GetFunctionType(FnInfo, (ObjCABI == 2)); 1503 1504 llvm::Constant *Fn = NULL; 1505 if (CGM.ReturnTypeUsesSret(FnInfo)) { 1506 Fn = (ObjCABI == 2) ? ObjCTypes.getSendStretFn2(IsSuper) 1507 : ObjCTypes.getSendStretFn(IsSuper); 1508 } else if (ResultType->isFloatingType()) { 1509 if (ObjCABI == 2) { 1510 if (const BuiltinType *BT = ResultType->getAsBuiltinType()) { 1511 BuiltinType::Kind k = BT->getKind(); 1512 Fn = (k == BuiltinType::LongDouble) ? ObjCTypes.getSendFpretFn2(IsSuper) 1513 : ObjCTypes.getSendFn2(IsSuper); 1514 } else { 1515 Fn = ObjCTypes.getSendFn2(IsSuper); 1516 } 1517 } 1518 else 1519 // FIXME. This currently matches gcc's API for x86-32. May need to change 1520 // for others if we have their API. 1521 Fn = ObjCTypes.getSendFpretFn(IsSuper); 1522 } else { 1523 Fn = (ObjCABI == 2) ? ObjCTypes.getSendFn2(IsSuper) 1524 : ObjCTypes.getSendFn(IsSuper); 1525 } 1526 assert(Fn && "EmitLegacyMessageSend - unknown API"); 1527 Fn = llvm::ConstantExpr::getBitCast(Fn, llvm::PointerType::getUnqual(FTy)); 1528 return CGF.EmitCall(FnInfo, Fn, ActualArgs); 1529} 1530 1531llvm::Value *CGObjCMac::GenerateProtocolRef(CGBuilderTy &Builder, 1532 const ObjCProtocolDecl *PD) { 1533 // FIXME: I don't understand why gcc generates this, or where it is 1534 // resolved. Investigate. Its also wasteful to look this up over and over. 1535 LazySymbols.insert(&CGM.getContext().Idents.get("Protocol")); 1536 1537 return llvm::ConstantExpr::getBitCast(GetProtocolRef(PD), 1538 ObjCTypes.ExternalProtocolPtrTy); 1539} 1540 1541void CGObjCCommonMac::GenerateProtocol(const ObjCProtocolDecl *PD) { 1542 // FIXME: We shouldn't need this, the protocol decl should contain enough 1543 // information to tell us whether this was a declaration or a definition. 1544 DefinedProtocols.insert(PD->getIdentifier()); 1545 1546 // If we have generated a forward reference to this protocol, emit 1547 // it now. Otherwise do nothing, the protocol objects are lazily 1548 // emitted. 1549 if (Protocols.count(PD->getIdentifier())) 1550 GetOrEmitProtocol(PD); 1551} 1552 1553llvm::Constant *CGObjCCommonMac::GetProtocolRef(const ObjCProtocolDecl *PD) { 1554 if (DefinedProtocols.count(PD->getIdentifier())) 1555 return GetOrEmitProtocol(PD); 1556 return GetOrEmitProtocolRef(PD); 1557} 1558 1559/* 1560 // APPLE LOCAL radar 4585769 - Objective-C 1.0 extensions 1561 struct _objc_protocol { 1562 struct _objc_protocol_extension *isa; 1563 char *protocol_name; 1564 struct _objc_protocol_list *protocol_list; 1565 struct _objc__method_prototype_list *instance_methods; 1566 struct _objc__method_prototype_list *class_methods 1567 }; 1568 1569 See EmitProtocolExtension(). 1570*/ 1571llvm::Constant *CGObjCMac::GetOrEmitProtocol(const ObjCProtocolDecl *PD) { 1572 llvm::GlobalVariable *&Entry = Protocols[PD->getIdentifier()]; 1573 1574 // Early exit if a defining object has already been generated. 1575 if (Entry && Entry->hasInitializer()) 1576 return Entry; 1577 1578 // FIXME: I don't understand why gcc generates this, or where it is 1579 // resolved. Investigate. Its also wasteful to look this up over and over. 1580 LazySymbols.insert(&CGM.getContext().Idents.get("Protocol")); 1581 1582 const char *ProtocolName = PD->getNameAsCString(); 1583 1584 // Construct method lists. 1585 std::vector<llvm::Constant*> InstanceMethods, ClassMethods; 1586 std::vector<llvm::Constant*> OptInstanceMethods, OptClassMethods; 1587 for (ObjCProtocolDecl::instmeth_iterator 1588 i = PD->instmeth_begin(), e = PD->instmeth_end(); i != e; ++i) { 1589 ObjCMethodDecl *MD = *i; 1590 llvm::Constant *C = GetMethodDescriptionConstant(MD); 1591 if (MD->getImplementationControl() == ObjCMethodDecl::Optional) { 1592 OptInstanceMethods.push_back(C); 1593 } else { 1594 InstanceMethods.push_back(C); 1595 } 1596 } 1597 1598 for (ObjCProtocolDecl::classmeth_iterator 1599 i = PD->classmeth_begin(), e = PD->classmeth_end(); i != e; ++i) { 1600 ObjCMethodDecl *MD = *i; 1601 llvm::Constant *C = GetMethodDescriptionConstant(MD); 1602 if (MD->getImplementationControl() == ObjCMethodDecl::Optional) { 1603 OptClassMethods.push_back(C); 1604 } else { 1605 ClassMethods.push_back(C); 1606 } 1607 } 1608 1609 std::vector<llvm::Constant*> Values(5); 1610 Values[0] = EmitProtocolExtension(PD, OptInstanceMethods, OptClassMethods); 1611 Values[1] = GetClassName(PD->getIdentifier()); 1612 Values[2] = 1613 EmitProtocolList("\01L_OBJC_PROTOCOL_REFS_" + PD->getNameAsString(), 1614 PD->protocol_begin(), 1615 PD->protocol_end()); 1616 Values[3] = 1617 EmitMethodDescList("\01L_OBJC_PROTOCOL_INSTANCE_METHODS_" 1618 + PD->getNameAsString(), 1619 "__OBJC,__cat_inst_meth,regular,no_dead_strip", 1620 InstanceMethods); 1621 Values[4] = 1622 EmitMethodDescList("\01L_OBJC_PROTOCOL_CLASS_METHODS_" 1623 + PD->getNameAsString(), 1624 "__OBJC,__cat_cls_meth,regular,no_dead_strip", 1625 ClassMethods); 1626 llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.ProtocolTy, 1627 Values); 1628 1629 if (Entry) { 1630 // Already created, fix the linkage and update the initializer. 1631 Entry->setLinkage(llvm::GlobalValue::InternalLinkage); 1632 Entry->setInitializer(Init); 1633 } else { 1634 Entry = 1635 new llvm::GlobalVariable(ObjCTypes.ProtocolTy, false, 1636 llvm::GlobalValue::InternalLinkage, 1637 Init, 1638 std::string("\01L_OBJC_PROTOCOL_")+ProtocolName, 1639 &CGM.getModule()); 1640 Entry->setSection("__OBJC,__protocol,regular,no_dead_strip"); 1641 Entry->setAlignment(4); 1642 UsedGlobals.push_back(Entry); 1643 // FIXME: Is this necessary? Why only for protocol? 1644 Entry->setAlignment(4); 1645 } 1646 1647 return Entry; 1648} 1649 1650llvm::Constant *CGObjCMac::GetOrEmitProtocolRef(const ObjCProtocolDecl *PD) { 1651 llvm::GlobalVariable *&Entry = Protocols[PD->getIdentifier()]; 1652 1653 if (!Entry) { 1654 // We use the initializer as a marker of whether this is a forward 1655 // reference or not. At module finalization we add the empty 1656 // contents for protocols which were referenced but never defined. 1657 Entry = 1658 new llvm::GlobalVariable(ObjCTypes.ProtocolTy, false, 1659 llvm::GlobalValue::ExternalLinkage, 1660 0, 1661 "\01L_OBJC_PROTOCOL_" + PD->getNameAsString(), 1662 &CGM.getModule()); 1663 Entry->setSection("__OBJC,__protocol,regular,no_dead_strip"); 1664 Entry->setAlignment(4); 1665 UsedGlobals.push_back(Entry); 1666 // FIXME: Is this necessary? Why only for protocol? 1667 Entry->setAlignment(4); 1668 } 1669 1670 return Entry; 1671} 1672 1673/* 1674 struct _objc_protocol_extension { 1675 uint32_t size; 1676 struct objc_method_description_list *optional_instance_methods; 1677 struct objc_method_description_list *optional_class_methods; 1678 struct objc_property_list *instance_properties; 1679 }; 1680*/ 1681llvm::Constant * 1682CGObjCMac::EmitProtocolExtension(const ObjCProtocolDecl *PD, 1683 const ConstantVector &OptInstanceMethods, 1684 const ConstantVector &OptClassMethods) { 1685 uint64_t Size = 1686 CGM.getTargetData().getTypeAllocSize(ObjCTypes.ProtocolExtensionTy); 1687 std::vector<llvm::Constant*> Values(4); 1688 Values[0] = llvm::ConstantInt::get(ObjCTypes.IntTy, Size); 1689 Values[1] = 1690 EmitMethodDescList("\01L_OBJC_PROTOCOL_INSTANCE_METHODS_OPT_" 1691 + PD->getNameAsString(), 1692 "__OBJC,__cat_inst_meth,regular,no_dead_strip", 1693 OptInstanceMethods); 1694 Values[2] = 1695 EmitMethodDescList("\01L_OBJC_PROTOCOL_CLASS_METHODS_OPT_" 1696 + PD->getNameAsString(), 1697 "__OBJC,__cat_cls_meth,regular,no_dead_strip", 1698 OptClassMethods); 1699 Values[3] = EmitPropertyList("\01L_OBJC_$_PROP_PROTO_LIST_" + 1700 PD->getNameAsString(), 1701 0, PD, ObjCTypes); 1702 1703 // Return null if no extension bits are used. 1704 if (Values[1]->isNullValue() && Values[2]->isNullValue() && 1705 Values[3]->isNullValue()) 1706 return llvm::Constant::getNullValue(ObjCTypes.ProtocolExtensionPtrTy); 1707 1708 llvm::Constant *Init = 1709 llvm::ConstantStruct::get(ObjCTypes.ProtocolExtensionTy, Values); 1710 1711 // No special section, but goes in llvm.used 1712 return CreateMetadataVar("\01L_OBJC_PROTOCOLEXT_" + PD->getNameAsString(), 1713 Init, 1714 0, 0, true); 1715} 1716 1717/* 1718 struct objc_protocol_list { 1719 struct objc_protocol_list *next; 1720 long count; 1721 Protocol *list[]; 1722 }; 1723*/ 1724llvm::Constant * 1725CGObjCMac::EmitProtocolList(const std::string &Name, 1726 ObjCProtocolDecl::protocol_iterator begin, 1727 ObjCProtocolDecl::protocol_iterator end) { 1728 std::vector<llvm::Constant*> ProtocolRefs; 1729 1730 for (; begin != end; ++begin) 1731 ProtocolRefs.push_back(GetProtocolRef(*begin)); 1732 1733 // Just return null for empty protocol lists 1734 if (ProtocolRefs.empty()) 1735 return llvm::Constant::getNullValue(ObjCTypes.ProtocolListPtrTy); 1736 1737 // This list is null terminated. 1738 ProtocolRefs.push_back(llvm::Constant::getNullValue(ObjCTypes.ProtocolPtrTy)); 1739 1740 std::vector<llvm::Constant*> Values(3); 1741 // This field is only used by the runtime. 1742 Values[0] = llvm::Constant::getNullValue(ObjCTypes.ProtocolListPtrTy); 1743 Values[1] = llvm::ConstantInt::get(ObjCTypes.LongTy, ProtocolRefs.size() - 1); 1744 Values[2] = 1745 llvm::ConstantArray::get(llvm::ArrayType::get(ObjCTypes.ProtocolPtrTy, 1746 ProtocolRefs.size()), 1747 ProtocolRefs); 1748 1749 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 1750 llvm::GlobalVariable *GV = 1751 CreateMetadataVar(Name, Init, "__OBJC,__cat_cls_meth,regular,no_dead_strip", 1752 4, false); 1753 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.ProtocolListPtrTy); 1754} 1755 1756/* 1757 struct _objc_property { 1758 const char * const name; 1759 const char * const attributes; 1760 }; 1761 1762 struct _objc_property_list { 1763 uint32_t entsize; // sizeof (struct _objc_property) 1764 uint32_t prop_count; 1765 struct _objc_property[prop_count]; 1766 }; 1767*/ 1768llvm::Constant *CGObjCCommonMac::EmitPropertyList(const std::string &Name, 1769 const Decl *Container, 1770 const ObjCContainerDecl *OCD, 1771 const ObjCCommonTypesHelper &ObjCTypes) { 1772 std::vector<llvm::Constant*> Properties, Prop(2); 1773 for (ObjCContainerDecl::prop_iterator I = OCD->prop_begin(), 1774 E = OCD->prop_end(); I != E; ++I) { 1775 const ObjCPropertyDecl *PD = *I; 1776 Prop[0] = GetPropertyName(PD->getIdentifier()); 1777 Prop[1] = GetPropertyTypeString(PD, Container); 1778 Properties.push_back(llvm::ConstantStruct::get(ObjCTypes.PropertyTy, 1779 Prop)); 1780 } 1781 1782 // Return null for empty list. 1783 if (Properties.empty()) 1784 return llvm::Constant::getNullValue(ObjCTypes.PropertyListPtrTy); 1785 1786 unsigned PropertySize = 1787 CGM.getTargetData().getTypeAllocSize(ObjCTypes.PropertyTy); 1788 std::vector<llvm::Constant*> Values(3); 1789 Values[0] = llvm::ConstantInt::get(ObjCTypes.IntTy, PropertySize); 1790 Values[1] = llvm::ConstantInt::get(ObjCTypes.IntTy, Properties.size()); 1791 llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.PropertyTy, 1792 Properties.size()); 1793 Values[2] = llvm::ConstantArray::get(AT, Properties); 1794 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 1795 1796 llvm::GlobalVariable *GV = 1797 CreateMetadataVar(Name, Init, 1798 (ObjCABI == 2) ? "__DATA, __objc_const" : 1799 "__OBJC,__property,regular,no_dead_strip", 1800 (ObjCABI == 2) ? 8 : 4, 1801 true); 1802 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.PropertyListPtrTy); 1803} 1804 1805/* 1806 struct objc_method_description_list { 1807 int count; 1808 struct objc_method_description list[]; 1809 }; 1810*/ 1811llvm::Constant * 1812CGObjCMac::GetMethodDescriptionConstant(const ObjCMethodDecl *MD) { 1813 std::vector<llvm::Constant*> Desc(2); 1814 Desc[0] = llvm::ConstantExpr::getBitCast(GetMethodVarName(MD->getSelector()), 1815 ObjCTypes.SelectorPtrTy); 1816 Desc[1] = GetMethodVarType(MD); 1817 return llvm::ConstantStruct::get(ObjCTypes.MethodDescriptionTy, 1818 Desc); 1819} 1820 1821llvm::Constant *CGObjCMac::EmitMethodDescList(const std::string &Name, 1822 const char *Section, 1823 const ConstantVector &Methods) { 1824 // Return null for empty list. 1825 if (Methods.empty()) 1826 return llvm::Constant::getNullValue(ObjCTypes.MethodDescriptionListPtrTy); 1827 1828 std::vector<llvm::Constant*> Values(2); 1829 Values[0] = llvm::ConstantInt::get(ObjCTypes.IntTy, Methods.size()); 1830 llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.MethodDescriptionTy, 1831 Methods.size()); 1832 Values[1] = llvm::ConstantArray::get(AT, Methods); 1833 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 1834 1835 llvm::GlobalVariable *GV = CreateMetadataVar(Name, Init, Section, 4, true); 1836 return llvm::ConstantExpr::getBitCast(GV, 1837 ObjCTypes.MethodDescriptionListPtrTy); 1838} 1839 1840/* 1841 struct _objc_category { 1842 char *category_name; 1843 char *class_name; 1844 struct _objc_method_list *instance_methods; 1845 struct _objc_method_list *class_methods; 1846 struct _objc_protocol_list *protocols; 1847 uint32_t size; // <rdar://4585769> 1848 struct _objc_property_list *instance_properties; 1849 }; 1850 */ 1851void CGObjCMac::GenerateCategory(const ObjCCategoryImplDecl *OCD) { 1852 unsigned Size = CGM.getTargetData().getTypeAllocSize(ObjCTypes.CategoryTy); 1853 1854 // FIXME: This is poor design, the OCD should have a pointer to the category 1855 // decl. Additionally, note that Category can be null for the @implementation 1856 // w/o an @interface case. Sema should just create one for us as it does for 1857 // @implementation so everyone else can live life under a clear blue sky. 1858 const ObjCInterfaceDecl *Interface = OCD->getClassInterface(); 1859 const ObjCCategoryDecl *Category = 1860 Interface->FindCategoryDeclaration(OCD->getIdentifier()); 1861 std::string ExtName(Interface->getNameAsString() + "_" + 1862 OCD->getNameAsString()); 1863 1864 std::vector<llvm::Constant*> InstanceMethods, ClassMethods; 1865 for (ObjCCategoryImplDecl::instmeth_iterator 1866 i = OCD->instmeth_begin(), e = OCD->instmeth_end(); i != e; ++i) { 1867 // Instance methods should always be defined. 1868 InstanceMethods.push_back(GetMethodConstant(*i)); 1869 } 1870 for (ObjCCategoryImplDecl::classmeth_iterator 1871 i = OCD->classmeth_begin(), e = OCD->classmeth_end(); i != e; ++i) { 1872 // Class methods should always be defined. 1873 ClassMethods.push_back(GetMethodConstant(*i)); 1874 } 1875 1876 std::vector<llvm::Constant*> Values(7); 1877 Values[0] = GetClassName(OCD->getIdentifier()); 1878 Values[1] = GetClassName(Interface->getIdentifier()); 1879 LazySymbols.insert(Interface->getIdentifier()); 1880 Values[2] = 1881 EmitMethodList(std::string("\01L_OBJC_CATEGORY_INSTANCE_METHODS_") + 1882 ExtName, 1883 "__OBJC,__cat_inst_meth,regular,no_dead_strip", 1884 InstanceMethods); 1885 Values[3] = 1886 EmitMethodList(std::string("\01L_OBJC_CATEGORY_CLASS_METHODS_") + ExtName, 1887 "__OBJC,__cat_cls_meth,regular,no_dead_strip", 1888 ClassMethods); 1889 if (Category) { 1890 Values[4] = 1891 EmitProtocolList(std::string("\01L_OBJC_CATEGORY_PROTOCOLS_") + ExtName, 1892 Category->protocol_begin(), 1893 Category->protocol_end()); 1894 } else { 1895 Values[4] = llvm::Constant::getNullValue(ObjCTypes.ProtocolListPtrTy); 1896 } 1897 Values[5] = llvm::ConstantInt::get(ObjCTypes.IntTy, Size); 1898 1899 // If there is no category @interface then there can be no properties. 1900 if (Category) { 1901 Values[6] = EmitPropertyList(std::string("\01l_OBJC_$_PROP_LIST_") + ExtName, 1902 OCD, Category, ObjCTypes); 1903 } else { 1904 Values[6] = llvm::Constant::getNullValue(ObjCTypes.PropertyListPtrTy); 1905 } 1906 1907 llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.CategoryTy, 1908 Values); 1909 1910 llvm::GlobalVariable *GV = 1911 CreateMetadataVar(std::string("\01L_OBJC_CATEGORY_")+ExtName, Init, 1912 "__OBJC,__category,regular,no_dead_strip", 1913 4, true); 1914 DefinedCategories.push_back(GV); 1915} 1916 1917// FIXME: Get from somewhere? 1918enum ClassFlags { 1919 eClassFlags_Factory = 0x00001, 1920 eClassFlags_Meta = 0x00002, 1921 // <rdr://5142207> 1922 eClassFlags_HasCXXStructors = 0x02000, 1923 eClassFlags_Hidden = 0x20000, 1924 eClassFlags_ABI2_Hidden = 0x00010, 1925 eClassFlags_ABI2_HasCXXStructors = 0x00004 // <rdr://4923634> 1926}; 1927 1928/* 1929 struct _objc_class { 1930 Class isa; 1931 Class super_class; 1932 const char *name; 1933 long version; 1934 long info; 1935 long instance_size; 1936 struct _objc_ivar_list *ivars; 1937 struct _objc_method_list *methods; 1938 struct _objc_cache *cache; 1939 struct _objc_protocol_list *protocols; 1940 // Objective-C 1.0 extensions (<rdr://4585769>) 1941 const char *ivar_layout; 1942 struct _objc_class_ext *ext; 1943 }; 1944 1945 See EmitClassExtension(); 1946 */ 1947void CGObjCMac::GenerateClass(const ObjCImplementationDecl *ID) { 1948 DefinedSymbols.insert(ID->getIdentifier()); 1949 1950 std::string ClassName = ID->getNameAsString(); 1951 // FIXME: Gross 1952 ObjCInterfaceDecl *Interface = 1953 const_cast<ObjCInterfaceDecl*>(ID->getClassInterface()); 1954 llvm::Constant *Protocols = 1955 EmitProtocolList("\01L_OBJC_CLASS_PROTOCOLS_" + ID->getNameAsString(), 1956 Interface->protocol_begin(), 1957 Interface->protocol_end()); 1958 unsigned Flags = eClassFlags_Factory; 1959 unsigned Size = 1960 CGM.getContext().getASTObjCImplementationLayout(ID).getSize() / 8; 1961 1962 // FIXME: Set CXX-structors flag. 1963 if (CGM.getDeclVisibilityMode(ID->getClassInterface()) == LangOptions::Hidden) 1964 Flags |= eClassFlags_Hidden; 1965 1966 std::vector<llvm::Constant*> InstanceMethods, ClassMethods; 1967 for (ObjCImplementationDecl::instmeth_iterator 1968 i = ID->instmeth_begin(), e = ID->instmeth_end(); i != e; ++i) { 1969 // Instance methods should always be defined. 1970 InstanceMethods.push_back(GetMethodConstant(*i)); 1971 } 1972 for (ObjCImplementationDecl::classmeth_iterator 1973 i = ID->classmeth_begin(), e = ID->classmeth_end(); i != e; ++i) { 1974 // Class methods should always be defined. 1975 ClassMethods.push_back(GetMethodConstant(*i)); 1976 } 1977 1978 for (ObjCImplementationDecl::propimpl_iterator 1979 i = ID->propimpl_begin(), e = ID->propimpl_end(); i != e; ++i) { 1980 ObjCPropertyImplDecl *PID = *i; 1981 1982 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) { 1983 ObjCPropertyDecl *PD = PID->getPropertyDecl(); 1984 1985 if (ObjCMethodDecl *MD = PD->getGetterMethodDecl()) 1986 if (llvm::Constant *C = GetMethodConstant(MD)) 1987 InstanceMethods.push_back(C); 1988 if (ObjCMethodDecl *MD = PD->getSetterMethodDecl()) 1989 if (llvm::Constant *C = GetMethodConstant(MD)) 1990 InstanceMethods.push_back(C); 1991 } 1992 } 1993 1994 std::vector<llvm::Constant*> Values(12); 1995 Values[ 0] = EmitMetaClass(ID, Protocols, ClassMethods); 1996 if (ObjCInterfaceDecl *Super = Interface->getSuperClass()) { 1997 // Record a reference to the super class. 1998 LazySymbols.insert(Super->getIdentifier()); 1999 2000 Values[ 1] = 2001 llvm::ConstantExpr::getBitCast(GetClassName(Super->getIdentifier()), 2002 ObjCTypes.ClassPtrTy); 2003 } else { 2004 Values[ 1] = llvm::Constant::getNullValue(ObjCTypes.ClassPtrTy); 2005 } 2006 Values[ 2] = GetClassName(ID->getIdentifier()); 2007 // Version is always 0. 2008 Values[ 3] = llvm::ConstantInt::get(ObjCTypes.LongTy, 0); 2009 Values[ 4] = llvm::ConstantInt::get(ObjCTypes.LongTy, Flags); 2010 Values[ 5] = llvm::ConstantInt::get(ObjCTypes.LongTy, Size); 2011 Values[ 6] = EmitIvarList(ID, false); 2012 Values[ 7] = 2013 EmitMethodList("\01L_OBJC_INSTANCE_METHODS_" + ID->getNameAsString(), 2014 "__OBJC,__inst_meth,regular,no_dead_strip", 2015 InstanceMethods); 2016 // cache is always NULL. 2017 Values[ 8] = llvm::Constant::getNullValue(ObjCTypes.CachePtrTy); 2018 Values[ 9] = Protocols; 2019 Values[10] = BuildIvarLayout(ID, true); 2020 Values[11] = EmitClassExtension(ID); 2021 llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.ClassTy, 2022 Values); 2023 2024 llvm::GlobalVariable *GV = 2025 CreateMetadataVar(std::string("\01L_OBJC_CLASS_")+ClassName, Init, 2026 "__OBJC,__class,regular,no_dead_strip", 2027 4, true); 2028 DefinedClasses.push_back(GV); 2029} 2030 2031llvm::Constant *CGObjCMac::EmitMetaClass(const ObjCImplementationDecl *ID, 2032 llvm::Constant *Protocols, 2033 const ConstantVector &Methods) { 2034 unsigned Flags = eClassFlags_Meta; 2035 unsigned Size = CGM.getTargetData().getTypeAllocSize(ObjCTypes.ClassTy); 2036 2037 if (CGM.getDeclVisibilityMode(ID->getClassInterface()) == LangOptions::Hidden) 2038 Flags |= eClassFlags_Hidden; 2039 2040 std::vector<llvm::Constant*> Values(12); 2041 // The isa for the metaclass is the root of the hierarchy. 2042 const ObjCInterfaceDecl *Root = ID->getClassInterface(); 2043 while (const ObjCInterfaceDecl *Super = Root->getSuperClass()) 2044 Root = Super; 2045 Values[ 0] = 2046 llvm::ConstantExpr::getBitCast(GetClassName(Root->getIdentifier()), 2047 ObjCTypes.ClassPtrTy); 2048 // The super class for the metaclass is emitted as the name of the 2049 // super class. The runtime fixes this up to point to the 2050 // *metaclass* for the super class. 2051 if (ObjCInterfaceDecl *Super = ID->getClassInterface()->getSuperClass()) { 2052 Values[ 1] = 2053 llvm::ConstantExpr::getBitCast(GetClassName(Super->getIdentifier()), 2054 ObjCTypes.ClassPtrTy); 2055 } else { 2056 Values[ 1] = llvm::Constant::getNullValue(ObjCTypes.ClassPtrTy); 2057 } 2058 Values[ 2] = GetClassName(ID->getIdentifier()); 2059 // Version is always 0. 2060 Values[ 3] = llvm::ConstantInt::get(ObjCTypes.LongTy, 0); 2061 Values[ 4] = llvm::ConstantInt::get(ObjCTypes.LongTy, Flags); 2062 Values[ 5] = llvm::ConstantInt::get(ObjCTypes.LongTy, Size); 2063 Values[ 6] = EmitIvarList(ID, true); 2064 Values[ 7] = 2065 EmitMethodList("\01L_OBJC_CLASS_METHODS_" + ID->getNameAsString(), 2066 "__OBJC,__cls_meth,regular,no_dead_strip", 2067 Methods); 2068 // cache is always NULL. 2069 Values[ 8] = llvm::Constant::getNullValue(ObjCTypes.CachePtrTy); 2070 Values[ 9] = Protocols; 2071 // ivar_layout for metaclass is always NULL. 2072 Values[10] = llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy); 2073 // The class extension is always unused for metaclasses. 2074 Values[11] = llvm::Constant::getNullValue(ObjCTypes.ClassExtensionPtrTy); 2075 llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.ClassTy, 2076 Values); 2077 2078 std::string Name("\01L_OBJC_METACLASS_"); 2079 Name += ID->getNameAsCString(); 2080 2081 // Check for a forward reference. 2082 llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name); 2083 if (GV) { 2084 assert(GV->getType()->getElementType() == ObjCTypes.ClassTy && 2085 "Forward metaclass reference has incorrect type."); 2086 GV->setLinkage(llvm::GlobalValue::InternalLinkage); 2087 GV->setInitializer(Init); 2088 } else { 2089 GV = new llvm::GlobalVariable(ObjCTypes.ClassTy, false, 2090 llvm::GlobalValue::InternalLinkage, 2091 Init, Name, 2092 &CGM.getModule()); 2093 } 2094 GV->setSection("__OBJC,__meta_class,regular,no_dead_strip"); 2095 GV->setAlignment(4); 2096 UsedGlobals.push_back(GV); 2097 2098 return GV; 2099} 2100 2101llvm::Constant *CGObjCMac::EmitMetaClassRef(const ObjCInterfaceDecl *ID) { 2102 std::string Name = "\01L_OBJC_METACLASS_" + ID->getNameAsString(); 2103 2104 // FIXME: Should we look these up somewhere other than the module. Its a bit 2105 // silly since we only generate these while processing an implementation, so 2106 // exactly one pointer would work if know when we entered/exitted an 2107 // implementation block. 2108 2109 // Check for an existing forward reference. 2110 // Previously, metaclass with internal linkage may have been defined. 2111 // pass 'true' as 2nd argument so it is returned. 2112 if (llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name, true)) { 2113 assert(GV->getType()->getElementType() == ObjCTypes.ClassTy && 2114 "Forward metaclass reference has incorrect type."); 2115 return GV; 2116 } else { 2117 // Generate as an external reference to keep a consistent 2118 // module. This will be patched up when we emit the metaclass. 2119 return new llvm::GlobalVariable(ObjCTypes.ClassTy, false, 2120 llvm::GlobalValue::ExternalLinkage, 2121 0, 2122 Name, 2123 &CGM.getModule()); 2124 } 2125} 2126 2127/* 2128 struct objc_class_ext { 2129 uint32_t size; 2130 const char *weak_ivar_layout; 2131 struct _objc_property_list *properties; 2132 }; 2133*/ 2134llvm::Constant * 2135CGObjCMac::EmitClassExtension(const ObjCImplementationDecl *ID) { 2136 uint64_t Size = 2137 CGM.getTargetData().getTypeAllocSize(ObjCTypes.ClassExtensionTy); 2138 2139 std::vector<llvm::Constant*> Values(3); 2140 Values[0] = llvm::ConstantInt::get(ObjCTypes.IntTy, Size); 2141 Values[1] = BuildIvarLayout(ID, false); 2142 Values[2] = EmitPropertyList("\01l_OBJC_$_PROP_LIST_" + ID->getNameAsString(), 2143 ID, ID->getClassInterface(), ObjCTypes); 2144 2145 // Return null if no extension bits are used. 2146 if (Values[1]->isNullValue() && Values[2]->isNullValue()) 2147 return llvm::Constant::getNullValue(ObjCTypes.ClassExtensionPtrTy); 2148 2149 llvm::Constant *Init = 2150 llvm::ConstantStruct::get(ObjCTypes.ClassExtensionTy, Values); 2151 return CreateMetadataVar("\01L_OBJC_CLASSEXT_" + ID->getNameAsString(), 2152 Init, "__OBJC,__class_ext,regular,no_dead_strip", 2153 4, true); 2154} 2155 2156/* 2157 struct objc_ivar { 2158 char *ivar_name; 2159 char *ivar_type; 2160 int ivar_offset; 2161 }; 2162 2163 struct objc_ivar_list { 2164 int ivar_count; 2165 struct objc_ivar list[count]; 2166 }; 2167 */ 2168llvm::Constant *CGObjCMac::EmitIvarList(const ObjCImplementationDecl *ID, 2169 bool ForClass) { 2170 std::vector<llvm::Constant*> Ivars, Ivar(3); 2171 2172 // When emitting the root class GCC emits ivar entries for the 2173 // actual class structure. It is not clear if we need to follow this 2174 // behavior; for now lets try and get away with not doing it. If so, 2175 // the cleanest solution would be to make up an ObjCInterfaceDecl 2176 // for the class. 2177 if (ForClass) 2178 return llvm::Constant::getNullValue(ObjCTypes.IvarListPtrTy); 2179 2180 ObjCInterfaceDecl *OID = 2181 const_cast<ObjCInterfaceDecl*>(ID->getClassInterface()); 2182 2183 llvm::SmallVector<ObjCIvarDecl*, 16> OIvars; 2184 CGM.getContext().ShallowCollectObjCIvars(OID, OIvars); 2185 2186 for (unsigned i = 0, e = OIvars.size(); i != e; ++i) { 2187 ObjCIvarDecl *IVD = OIvars[i]; 2188 // Ignore unnamed bit-fields. 2189 if (!IVD->getDeclName()) 2190 continue; 2191 Ivar[0] = GetMethodVarName(IVD->getIdentifier()); 2192 Ivar[1] = GetMethodVarType(IVD); 2193 Ivar[2] = llvm::ConstantInt::get(ObjCTypes.IntTy, 2194 ComputeIvarBaseOffset(CGM, OID, IVD)); 2195 Ivars.push_back(llvm::ConstantStruct::get(ObjCTypes.IvarTy, Ivar)); 2196 } 2197 2198 // Return null for empty list. 2199 if (Ivars.empty()) 2200 return llvm::Constant::getNullValue(ObjCTypes.IvarListPtrTy); 2201 2202 std::vector<llvm::Constant*> Values(2); 2203 Values[0] = llvm::ConstantInt::get(ObjCTypes.IntTy, Ivars.size()); 2204 llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.IvarTy, 2205 Ivars.size()); 2206 Values[1] = llvm::ConstantArray::get(AT, Ivars); 2207 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 2208 2209 llvm::GlobalVariable *GV; 2210 if (ForClass) 2211 GV = CreateMetadataVar("\01L_OBJC_CLASS_VARIABLES_" + ID->getNameAsString(), 2212 Init, "__OBJC,__class_vars,regular,no_dead_strip", 2213 4, true); 2214 else 2215 GV = CreateMetadataVar("\01L_OBJC_INSTANCE_VARIABLES_" 2216 + ID->getNameAsString(), 2217 Init, "__OBJC,__instance_vars,regular,no_dead_strip", 2218 4, true); 2219 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.IvarListPtrTy); 2220} 2221 2222/* 2223 struct objc_method { 2224 SEL method_name; 2225 char *method_types; 2226 void *method; 2227 }; 2228 2229 struct objc_method_list { 2230 struct objc_method_list *obsolete; 2231 int count; 2232 struct objc_method methods_list[count]; 2233 }; 2234*/ 2235 2236/// GetMethodConstant - Return a struct objc_method constant for the 2237/// given method if it has been defined. The result is null if the 2238/// method has not been defined. The return value has type MethodPtrTy. 2239llvm::Constant *CGObjCMac::GetMethodConstant(const ObjCMethodDecl *MD) { 2240 // FIXME: Use DenseMap::lookup 2241 llvm::Function *Fn = MethodDefinitions[MD]; 2242 if (!Fn) 2243 return 0; 2244 2245 std::vector<llvm::Constant*> Method(3); 2246 Method[0] = 2247 llvm::ConstantExpr::getBitCast(GetMethodVarName(MD->getSelector()), 2248 ObjCTypes.SelectorPtrTy); 2249 Method[1] = GetMethodVarType(MD); 2250 Method[2] = llvm::ConstantExpr::getBitCast(Fn, ObjCTypes.Int8PtrTy); 2251 return llvm::ConstantStruct::get(ObjCTypes.MethodTy, Method); 2252} 2253 2254llvm::Constant *CGObjCMac::EmitMethodList(const std::string &Name, 2255 const char *Section, 2256 const ConstantVector &Methods) { 2257 // Return null for empty list. 2258 if (Methods.empty()) 2259 return llvm::Constant::getNullValue(ObjCTypes.MethodListPtrTy); 2260 2261 std::vector<llvm::Constant*> Values(3); 2262 Values[0] = llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy); 2263 Values[1] = llvm::ConstantInt::get(ObjCTypes.IntTy, Methods.size()); 2264 llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.MethodTy, 2265 Methods.size()); 2266 Values[2] = llvm::ConstantArray::get(AT, Methods); 2267 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 2268 2269 llvm::GlobalVariable *GV = CreateMetadataVar(Name, Init, Section, 4, true); 2270 return llvm::ConstantExpr::getBitCast(GV, 2271 ObjCTypes.MethodListPtrTy); 2272} 2273 2274llvm::Function *CGObjCCommonMac::GenerateMethod(const ObjCMethodDecl *OMD, 2275 const ObjCContainerDecl *CD) { 2276 std::string Name; 2277 GetNameForMethod(OMD, CD, Name); 2278 2279 CodeGenTypes &Types = CGM.getTypes(); 2280 const llvm::FunctionType *MethodTy = 2281 Types.GetFunctionType(Types.getFunctionInfo(OMD), OMD->isVariadic()); 2282 llvm::Function *Method = 2283 llvm::Function::Create(MethodTy, 2284 llvm::GlobalValue::InternalLinkage, 2285 Name, 2286 &CGM.getModule()); 2287 MethodDefinitions.insert(std::make_pair(OMD, Method)); 2288 2289 return Method; 2290} 2291 2292llvm::GlobalVariable * 2293CGObjCCommonMac::CreateMetadataVar(const std::string &Name, 2294 llvm::Constant *Init, 2295 const char *Section, 2296 unsigned Align, 2297 bool AddToUsed) { 2298 const llvm::Type *Ty = Init->getType(); 2299 llvm::GlobalVariable *GV = 2300 new llvm::GlobalVariable(Ty, false, 2301 llvm::GlobalValue::InternalLinkage, 2302 Init, 2303 Name, 2304 &CGM.getModule()); 2305 if (Section) 2306 GV->setSection(Section); 2307 if (Align) 2308 GV->setAlignment(Align); 2309 if (AddToUsed) 2310 UsedGlobals.push_back(GV); 2311 return GV; 2312} 2313 2314llvm::Function *CGObjCMac::ModuleInitFunction() { 2315 // Abuse this interface function as a place to finalize. 2316 FinishModule(); 2317 2318 return NULL; 2319} 2320 2321llvm::Constant *CGObjCMac::GetPropertyGetFunction() { 2322 return ObjCTypes.getGetPropertyFn(); 2323} 2324 2325llvm::Constant *CGObjCMac::GetPropertySetFunction() { 2326 return ObjCTypes.getSetPropertyFn(); 2327} 2328 2329llvm::Constant *CGObjCMac::EnumerationMutationFunction() { 2330 return ObjCTypes.getEnumerationMutationFn(); 2331} 2332 2333/* 2334 2335Objective-C setjmp-longjmp (sjlj) Exception Handling 2336-- 2337 2338The basic framework for a @try-catch-finally is as follows: 2339{ 2340 objc_exception_data d; 2341 id _rethrow = null; 2342 bool _call_try_exit = true; 2343 2344 objc_exception_try_enter(&d); 2345 if (!setjmp(d.jmp_buf)) { 2346 ... try body ... 2347 } else { 2348 // exception path 2349 id _caught = objc_exception_extract(&d); 2350 2351 // enter new try scope for handlers 2352 if (!setjmp(d.jmp_buf)) { 2353 ... match exception and execute catch blocks ... 2354 2355 // fell off end, rethrow. 2356 _rethrow = _caught; 2357 ... jump-through-finally to finally_rethrow ... 2358 } else { 2359 // exception in catch block 2360 _rethrow = objc_exception_extract(&d); 2361 _call_try_exit = false; 2362 ... jump-through-finally to finally_rethrow ... 2363 } 2364 } 2365 ... jump-through-finally to finally_end ... 2366 2367finally: 2368 if (_call_try_exit) 2369 objc_exception_try_exit(&d); 2370 2371 ... finally block .... 2372 ... dispatch to finally destination ... 2373 2374finally_rethrow: 2375 objc_exception_throw(_rethrow); 2376 2377finally_end: 2378} 2379 2380This framework differs slightly from the one gcc uses, in that gcc 2381uses _rethrow to determine if objc_exception_try_exit should be called 2382and if the object should be rethrown. This breaks in the face of 2383throwing nil and introduces unnecessary branches. 2384 2385We specialize this framework for a few particular circumstances: 2386 2387 - If there are no catch blocks, then we avoid emitting the second 2388 exception handling context. 2389 2390 - If there is a catch-all catch block (i.e. @catch(...) or @catch(id 2391 e)) we avoid emitting the code to rethrow an uncaught exception. 2392 2393 - FIXME: If there is no @finally block we can do a few more 2394 simplifications. 2395 2396Rethrows and Jumps-Through-Finally 2397-- 2398 2399Support for implicit rethrows and jumping through the finally block is 2400handled by storing the current exception-handling context in 2401ObjCEHStack. 2402 2403In order to implement proper @finally semantics, we support one basic 2404mechanism for jumping through the finally block to an arbitrary 2405destination. Constructs which generate exits from a @try or @catch 2406block use this mechanism to implement the proper semantics by chaining 2407jumps, as necessary. 2408 2409This mechanism works like the one used for indirect goto: we 2410arbitrarily assign an ID to each destination and store the ID for the 2411destination in a variable prior to entering the finally block. At the 2412end of the finally block we simply create a switch to the proper 2413destination. 2414 2415Code gen for @synchronized(expr) stmt; 2416Effectively generating code for: 2417objc_sync_enter(expr); 2418@try stmt @finally { objc_sync_exit(expr); } 2419*/ 2420 2421void CGObjCMac::EmitTryOrSynchronizedStmt(CodeGen::CodeGenFunction &CGF, 2422 const Stmt &S) { 2423 bool isTry = isa<ObjCAtTryStmt>(S); 2424 // Create various blocks we refer to for handling @finally. 2425 llvm::BasicBlock *FinallyBlock = CGF.createBasicBlock("finally"); 2426 llvm::BasicBlock *FinallyExit = CGF.createBasicBlock("finally.exit"); 2427 llvm::BasicBlock *FinallyNoExit = CGF.createBasicBlock("finally.noexit"); 2428 llvm::BasicBlock *FinallyRethrow = CGF.createBasicBlock("finally.throw"); 2429 llvm::BasicBlock *FinallyEnd = CGF.createBasicBlock("finally.end"); 2430 2431 // For @synchronized, call objc_sync_enter(sync.expr). The 2432 // evaluation of the expression must occur before we enter the 2433 // @synchronized. We can safely avoid a temp here because jumps into 2434 // @synchronized are illegal & this will dominate uses. 2435 llvm::Value *SyncArg = 0; 2436 if (!isTry) { 2437 SyncArg = 2438 CGF.EmitScalarExpr(cast<ObjCAtSynchronizedStmt>(S).getSynchExpr()); 2439 SyncArg = CGF.Builder.CreateBitCast(SyncArg, ObjCTypes.ObjectPtrTy); 2440 CGF.Builder.CreateCall(ObjCTypes.getSyncEnterFn(), SyncArg); 2441 } 2442 2443 // Push an EH context entry, used for handling rethrows and jumps 2444 // through finally. 2445 CGF.PushCleanupBlock(FinallyBlock); 2446 2447 CGF.ObjCEHValueStack.push_back(0); 2448 2449 // Allocate memory for the exception data and rethrow pointer. 2450 llvm::Value *ExceptionData = CGF.CreateTempAlloca(ObjCTypes.ExceptionDataTy, 2451 "exceptiondata.ptr"); 2452 llvm::Value *RethrowPtr = CGF.CreateTempAlloca(ObjCTypes.ObjectPtrTy, 2453 "_rethrow"); 2454 llvm::Value *CallTryExitPtr = CGF.CreateTempAlloca(llvm::Type::Int1Ty, 2455 "_call_try_exit"); 2456 CGF.Builder.CreateStore(llvm::ConstantInt::getTrue(), CallTryExitPtr); 2457 2458 // Enter a new try block and call setjmp. 2459 CGF.Builder.CreateCall(ObjCTypes.getExceptionTryEnterFn(), ExceptionData); 2460 llvm::Value *JmpBufPtr = CGF.Builder.CreateStructGEP(ExceptionData, 0, 2461 "jmpbufarray"); 2462 JmpBufPtr = CGF.Builder.CreateStructGEP(JmpBufPtr, 0, "tmp"); 2463 llvm::Value *SetJmpResult = CGF.Builder.CreateCall(ObjCTypes.getSetJmpFn(), 2464 JmpBufPtr, "result"); 2465 2466 llvm::BasicBlock *TryBlock = CGF.createBasicBlock("try"); 2467 llvm::BasicBlock *TryHandler = CGF.createBasicBlock("try.handler"); 2468 CGF.Builder.CreateCondBr(CGF.Builder.CreateIsNotNull(SetJmpResult, "threw"), 2469 TryHandler, TryBlock); 2470 2471 // Emit the @try block. 2472 CGF.EmitBlock(TryBlock); 2473 CGF.EmitStmt(isTry ? cast<ObjCAtTryStmt>(S).getTryBody() 2474 : cast<ObjCAtSynchronizedStmt>(S).getSynchBody()); 2475 CGF.EmitBranchThroughCleanup(FinallyEnd); 2476 2477 // Emit the "exception in @try" block. 2478 CGF.EmitBlock(TryHandler); 2479 2480 // Retrieve the exception object. We may emit multiple blocks but 2481 // nothing can cross this so the value is already in SSA form. 2482 llvm::Value *Caught = 2483 CGF.Builder.CreateCall(ObjCTypes.getExceptionExtractFn(), 2484 ExceptionData, "caught"); 2485 CGF.ObjCEHValueStack.back() = Caught; 2486 if (!isTry) 2487 { 2488 CGF.Builder.CreateStore(Caught, RethrowPtr); 2489 CGF.Builder.CreateStore(llvm::ConstantInt::getFalse(), CallTryExitPtr); 2490 CGF.EmitBranchThroughCleanup(FinallyRethrow); 2491 } 2492 else if (const ObjCAtCatchStmt* CatchStmt = 2493 cast<ObjCAtTryStmt>(S).getCatchStmts()) 2494 { 2495 // Enter a new exception try block (in case a @catch block throws 2496 // an exception). 2497 CGF.Builder.CreateCall(ObjCTypes.getExceptionTryEnterFn(), ExceptionData); 2498 2499 llvm::Value *SetJmpResult = CGF.Builder.CreateCall(ObjCTypes.getSetJmpFn(), 2500 JmpBufPtr, "result"); 2501 llvm::Value *Threw = CGF.Builder.CreateIsNotNull(SetJmpResult, "threw"); 2502 2503 llvm::BasicBlock *CatchBlock = CGF.createBasicBlock("catch"); 2504 llvm::BasicBlock *CatchHandler = CGF.createBasicBlock("catch.handler"); 2505 CGF.Builder.CreateCondBr(Threw, CatchHandler, CatchBlock); 2506 2507 CGF.EmitBlock(CatchBlock); 2508 2509 // Handle catch list. As a special case we check if everything is 2510 // matched and avoid generating code for falling off the end if 2511 // so. 2512 bool AllMatched = false; 2513 for (; CatchStmt; CatchStmt = CatchStmt->getNextCatchStmt()) { 2514 llvm::BasicBlock *NextCatchBlock = CGF.createBasicBlock("catch"); 2515 2516 const ParmVarDecl *CatchParam = CatchStmt->getCatchParamDecl(); 2517 const PointerType *PT = 0; 2518 2519 // catch(...) always matches. 2520 if (!CatchParam) { 2521 AllMatched = true; 2522 } else { 2523 PT = CatchParam->getType()->getAsPointerType(); 2524 2525 // catch(id e) always matches. 2526 // FIXME: For the time being we also match id<X>; this should 2527 // be rejected by Sema instead. 2528 if ((PT && CGF.getContext().isObjCIdStructType(PT->getPointeeType())) || 2529 CatchParam->getType()->isObjCQualifiedIdType()) 2530 AllMatched = true; 2531 } 2532 2533 if (AllMatched) { 2534 if (CatchParam) { 2535 CGF.EmitLocalBlockVarDecl(*CatchParam); 2536 assert(CGF.HaveInsertPoint() && "DeclStmt destroyed insert point?"); 2537 CGF.Builder.CreateStore(Caught, CGF.GetAddrOfLocalVar(CatchParam)); 2538 } 2539 2540 CGF.EmitStmt(CatchStmt->getCatchBody()); 2541 CGF.EmitBranchThroughCleanup(FinallyEnd); 2542 break; 2543 } 2544 2545 assert(PT && "Unexpected non-pointer type in @catch"); 2546 QualType T = PT->getPointeeType(); 2547 const ObjCInterfaceType *ObjCType = T->getAsObjCInterfaceType(); 2548 assert(ObjCType && "Catch parameter must have Objective-C type!"); 2549 2550 // Check if the @catch block matches the exception object. 2551 llvm::Value *Class = EmitClassRef(CGF.Builder, ObjCType->getDecl()); 2552 2553 llvm::Value *Match = 2554 CGF.Builder.CreateCall2(ObjCTypes.getExceptionMatchFn(), 2555 Class, Caught, "match"); 2556 2557 llvm::BasicBlock *MatchedBlock = CGF.createBasicBlock("matched"); 2558 2559 CGF.Builder.CreateCondBr(CGF.Builder.CreateIsNotNull(Match, "matched"), 2560 MatchedBlock, NextCatchBlock); 2561 2562 // Emit the @catch block. 2563 CGF.EmitBlock(MatchedBlock); 2564 CGF.EmitLocalBlockVarDecl(*CatchParam); 2565 assert(CGF.HaveInsertPoint() && "DeclStmt destroyed insert point?"); 2566 2567 llvm::Value *Tmp = 2568 CGF.Builder.CreateBitCast(Caught, CGF.ConvertType(CatchParam->getType()), 2569 "tmp"); 2570 CGF.Builder.CreateStore(Tmp, CGF.GetAddrOfLocalVar(CatchParam)); 2571 2572 CGF.EmitStmt(CatchStmt->getCatchBody()); 2573 CGF.EmitBranchThroughCleanup(FinallyEnd); 2574 2575 CGF.EmitBlock(NextCatchBlock); 2576 } 2577 2578 if (!AllMatched) { 2579 // None of the handlers caught the exception, so store it to be 2580 // rethrown at the end of the @finally block. 2581 CGF.Builder.CreateStore(Caught, RethrowPtr); 2582 CGF.EmitBranchThroughCleanup(FinallyRethrow); 2583 } 2584 2585 // Emit the exception handler for the @catch blocks. 2586 CGF.EmitBlock(CatchHandler); 2587 CGF.Builder.CreateStore( 2588 CGF.Builder.CreateCall(ObjCTypes.getExceptionExtractFn(), 2589 ExceptionData), 2590 RethrowPtr); 2591 CGF.Builder.CreateStore(llvm::ConstantInt::getFalse(), CallTryExitPtr); 2592 CGF.EmitBranchThroughCleanup(FinallyRethrow); 2593 } else { 2594 CGF.Builder.CreateStore(Caught, RethrowPtr); 2595 CGF.Builder.CreateStore(llvm::ConstantInt::getFalse(), CallTryExitPtr); 2596 CGF.EmitBranchThroughCleanup(FinallyRethrow); 2597 } 2598 2599 // Pop the exception-handling stack entry. It is important to do 2600 // this now, because the code in the @finally block is not in this 2601 // context. 2602 CodeGenFunction::CleanupBlockInfo Info = CGF.PopCleanupBlock(); 2603 2604 CGF.ObjCEHValueStack.pop_back(); 2605 2606 // Emit the @finally block. 2607 CGF.EmitBlock(FinallyBlock); 2608 llvm::Value* CallTryExit = CGF.Builder.CreateLoad(CallTryExitPtr, "tmp"); 2609 2610 CGF.Builder.CreateCondBr(CallTryExit, FinallyExit, FinallyNoExit); 2611 2612 CGF.EmitBlock(FinallyExit); 2613 CGF.Builder.CreateCall(ObjCTypes.getExceptionTryExitFn(), ExceptionData); 2614 2615 CGF.EmitBlock(FinallyNoExit); 2616 if (isTry) { 2617 if (const ObjCAtFinallyStmt* FinallyStmt = 2618 cast<ObjCAtTryStmt>(S).getFinallyStmt()) 2619 CGF.EmitStmt(FinallyStmt->getFinallyBody()); 2620 } else { 2621 // Emit objc_sync_exit(expr); as finally's sole statement for 2622 // @synchronized. 2623 CGF.Builder.CreateCall(ObjCTypes.getSyncExitFn(), SyncArg); 2624 } 2625 2626 // Emit the switch block 2627 if (Info.SwitchBlock) 2628 CGF.EmitBlock(Info.SwitchBlock); 2629 if (Info.EndBlock) 2630 CGF.EmitBlock(Info.EndBlock); 2631 2632 CGF.EmitBlock(FinallyRethrow); 2633 CGF.Builder.CreateCall(ObjCTypes.getExceptionThrowFn(), 2634 CGF.Builder.CreateLoad(RethrowPtr)); 2635 CGF.Builder.CreateUnreachable(); 2636 2637 CGF.EmitBlock(FinallyEnd); 2638} 2639 2640void CGObjCMac::EmitThrowStmt(CodeGen::CodeGenFunction &CGF, 2641 const ObjCAtThrowStmt &S) { 2642 llvm::Value *ExceptionAsObject; 2643 2644 if (const Expr *ThrowExpr = S.getThrowExpr()) { 2645 llvm::Value *Exception = CGF.EmitScalarExpr(ThrowExpr); 2646 ExceptionAsObject = 2647 CGF.Builder.CreateBitCast(Exception, ObjCTypes.ObjectPtrTy, "tmp"); 2648 } else { 2649 assert((!CGF.ObjCEHValueStack.empty() && CGF.ObjCEHValueStack.back()) && 2650 "Unexpected rethrow outside @catch block."); 2651 ExceptionAsObject = CGF.ObjCEHValueStack.back(); 2652 } 2653 2654 CGF.Builder.CreateCall(ObjCTypes.getExceptionThrowFn(), ExceptionAsObject); 2655 CGF.Builder.CreateUnreachable(); 2656 2657 // Clear the insertion point to indicate we are in unreachable code. 2658 CGF.Builder.ClearInsertionPoint(); 2659} 2660 2661/// EmitObjCWeakRead - Code gen for loading value of a __weak 2662/// object: objc_read_weak (id *src) 2663/// 2664llvm::Value * CGObjCMac::EmitObjCWeakRead(CodeGen::CodeGenFunction &CGF, 2665 llvm::Value *AddrWeakObj) 2666{ 2667 const llvm::Type* DestTy = 2668 cast<llvm::PointerType>(AddrWeakObj->getType())->getElementType(); 2669 AddrWeakObj = CGF.Builder.CreateBitCast(AddrWeakObj, ObjCTypes.PtrObjectPtrTy); 2670 llvm::Value *read_weak = CGF.Builder.CreateCall(ObjCTypes.getGcReadWeakFn(), 2671 AddrWeakObj, "weakread"); 2672 read_weak = CGF.Builder.CreateBitCast(read_weak, DestTy); 2673 return read_weak; 2674} 2675 2676/// EmitObjCWeakAssign - Code gen for assigning to a __weak object. 2677/// objc_assign_weak (id src, id *dst) 2678/// 2679void CGObjCMac::EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF, 2680 llvm::Value *src, llvm::Value *dst) 2681{ 2682 const llvm::Type * SrcTy = src->getType(); 2683 if (!isa<llvm::PointerType>(SrcTy)) { 2684 unsigned Size = CGM.getTargetData().getTypeAllocSize(SrcTy); 2685 assert(Size <= 8 && "does not support size > 8"); 2686 src = (Size == 4) ? CGF.Builder.CreateBitCast(src, ObjCTypes.IntTy) 2687 : CGF.Builder.CreateBitCast(src, ObjCTypes.LongLongTy); 2688 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy); 2689 } 2690 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy); 2691 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy); 2692 CGF.Builder.CreateCall2(ObjCTypes.getGcAssignWeakFn(), 2693 src, dst, "weakassign"); 2694 return; 2695} 2696 2697/// EmitObjCGlobalAssign - Code gen for assigning to a __strong object. 2698/// objc_assign_global (id src, id *dst) 2699/// 2700void CGObjCMac::EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF, 2701 llvm::Value *src, llvm::Value *dst) 2702{ 2703 const llvm::Type * SrcTy = src->getType(); 2704 if (!isa<llvm::PointerType>(SrcTy)) { 2705 unsigned Size = CGM.getTargetData().getTypeAllocSize(SrcTy); 2706 assert(Size <= 8 && "does not support size > 8"); 2707 src = (Size == 4) ? CGF.Builder.CreateBitCast(src, ObjCTypes.IntTy) 2708 : CGF.Builder.CreateBitCast(src, ObjCTypes.LongLongTy); 2709 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy); 2710 } 2711 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy); 2712 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy); 2713 CGF.Builder.CreateCall2(ObjCTypes.getGcAssignGlobalFn(), 2714 src, dst, "globalassign"); 2715 return; 2716} 2717 2718/// EmitObjCIvarAssign - Code gen for assigning to a __strong object. 2719/// objc_assign_ivar (id src, id *dst) 2720/// 2721void CGObjCMac::EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF, 2722 llvm::Value *src, llvm::Value *dst) 2723{ 2724 const llvm::Type * SrcTy = src->getType(); 2725 if (!isa<llvm::PointerType>(SrcTy)) { 2726 unsigned Size = CGM.getTargetData().getTypeAllocSize(SrcTy); 2727 assert(Size <= 8 && "does not support size > 8"); 2728 src = (Size == 4) ? CGF.Builder.CreateBitCast(src, ObjCTypes.IntTy) 2729 : CGF.Builder.CreateBitCast(src, ObjCTypes.LongLongTy); 2730 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy); 2731 } 2732 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy); 2733 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy); 2734 CGF.Builder.CreateCall2(ObjCTypes.getGcAssignIvarFn(), 2735 src, dst, "assignivar"); 2736 return; 2737} 2738 2739/// EmitObjCStrongCastAssign - Code gen for assigning to a __strong cast object. 2740/// objc_assign_strongCast (id src, id *dst) 2741/// 2742void CGObjCMac::EmitObjCStrongCastAssign(CodeGen::CodeGenFunction &CGF, 2743 llvm::Value *src, llvm::Value *dst) 2744{ 2745 const llvm::Type * SrcTy = src->getType(); 2746 if (!isa<llvm::PointerType>(SrcTy)) { 2747 unsigned Size = CGM.getTargetData().getTypeAllocSize(SrcTy); 2748 assert(Size <= 8 && "does not support size > 8"); 2749 src = (Size == 4) ? CGF.Builder.CreateBitCast(src, ObjCTypes.IntTy) 2750 : CGF.Builder.CreateBitCast(src, ObjCTypes.LongLongTy); 2751 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy); 2752 } 2753 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy); 2754 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy); 2755 CGF.Builder.CreateCall2(ObjCTypes.getGcAssignStrongCastFn(), 2756 src, dst, "weakassign"); 2757 return; 2758} 2759 2760/// EmitObjCValueForIvar - Code Gen for ivar reference. 2761/// 2762LValue CGObjCMac::EmitObjCValueForIvar(CodeGen::CodeGenFunction &CGF, 2763 QualType ObjectTy, 2764 llvm::Value *BaseValue, 2765 const ObjCIvarDecl *Ivar, 2766 unsigned CVRQualifiers) { 2767 const ObjCInterfaceDecl *ID = ObjectTy->getAsObjCInterfaceType()->getDecl(); 2768 return EmitValueForIvarAtOffset(CGF, ID, BaseValue, Ivar, CVRQualifiers, 2769 EmitIvarOffset(CGF, ID, Ivar)); 2770} 2771 2772llvm::Value *CGObjCMac::EmitIvarOffset(CodeGen::CodeGenFunction &CGF, 2773 const ObjCInterfaceDecl *Interface, 2774 const ObjCIvarDecl *Ivar) { 2775 uint64_t Offset = ComputeIvarBaseOffset(CGM, Interface, Ivar); 2776 return llvm::ConstantInt::get( 2777 CGM.getTypes().ConvertType(CGM.getContext().LongTy), 2778 Offset); 2779} 2780 2781/* *** Private Interface *** */ 2782 2783/// EmitImageInfo - Emit the image info marker used to encode some module 2784/// level information. 2785/// 2786/// See: <rdr://4810609&4810587&4810587> 2787/// struct IMAGE_INFO { 2788/// unsigned version; 2789/// unsigned flags; 2790/// }; 2791enum ImageInfoFlags { 2792 eImageInfo_FixAndContinue = (1 << 0), // FIXME: Not sure what 2793 // this implies. 2794 eImageInfo_GarbageCollected = (1 << 1), 2795 eImageInfo_GCOnly = (1 << 2), 2796 eImageInfo_OptimizedByDyld = (1 << 3), // FIXME: When is this set. 2797 2798 // A flag indicating that the module has no instances of an 2799 // @synthesize of a superclass variable. <rdar://problem/6803242> 2800 eImageInfo_CorrectedSynthesize = (1 << 4) 2801}; 2802 2803void CGObjCMac::EmitImageInfo() { 2804 unsigned version = 0; // Version is unused? 2805 unsigned flags = 0; 2806 2807 // FIXME: Fix and continue? 2808 if (CGM.getLangOptions().getGCMode() != LangOptions::NonGC) 2809 flags |= eImageInfo_GarbageCollected; 2810 if (CGM.getLangOptions().getGCMode() == LangOptions::GCOnly) 2811 flags |= eImageInfo_GCOnly; 2812 2813 // We never allow @synthesize of a superclass property. 2814 flags |= eImageInfo_CorrectedSynthesize; 2815 2816 // Emitted as int[2]; 2817 llvm::Constant *values[2] = { 2818 llvm::ConstantInt::get(llvm::Type::Int32Ty, version), 2819 llvm::ConstantInt::get(llvm::Type::Int32Ty, flags) 2820 }; 2821 llvm::ArrayType *AT = llvm::ArrayType::get(llvm::Type::Int32Ty, 2); 2822 2823 const char *Section; 2824 if (ObjCABI == 1) 2825 Section = "__OBJC, __image_info,regular"; 2826 else 2827 Section = "__DATA, __objc_imageinfo, regular, no_dead_strip"; 2828 llvm::GlobalVariable *GV = 2829 CreateMetadataVar("\01L_OBJC_IMAGE_INFO", 2830 llvm::ConstantArray::get(AT, values, 2), 2831 Section, 2832 0, 2833 true); 2834 GV->setConstant(true); 2835} 2836 2837 2838// struct objc_module { 2839// unsigned long version; 2840// unsigned long size; 2841// const char *name; 2842// Symtab symtab; 2843// }; 2844 2845// FIXME: Get from somewhere 2846static const int ModuleVersion = 7; 2847 2848void CGObjCMac::EmitModuleInfo() { 2849 uint64_t Size = CGM.getTargetData().getTypeAllocSize(ObjCTypes.ModuleTy); 2850 2851 std::vector<llvm::Constant*> Values(4); 2852 Values[0] = llvm::ConstantInt::get(ObjCTypes.LongTy, ModuleVersion); 2853 Values[1] = llvm::ConstantInt::get(ObjCTypes.LongTy, Size); 2854 // This used to be the filename, now it is unused. <rdr://4327263> 2855 Values[2] = GetClassName(&CGM.getContext().Idents.get("")); 2856 Values[3] = EmitModuleSymbols(); 2857 CreateMetadataVar("\01L_OBJC_MODULES", 2858 llvm::ConstantStruct::get(ObjCTypes.ModuleTy, Values), 2859 "__OBJC,__module_info,regular,no_dead_strip", 2860 4, true); 2861} 2862 2863llvm::Constant *CGObjCMac::EmitModuleSymbols() { 2864 unsigned NumClasses = DefinedClasses.size(); 2865 unsigned NumCategories = DefinedCategories.size(); 2866 2867 // Return null if no symbols were defined. 2868 if (!NumClasses && !NumCategories) 2869 return llvm::Constant::getNullValue(ObjCTypes.SymtabPtrTy); 2870 2871 std::vector<llvm::Constant*> Values(5); 2872 Values[0] = llvm::ConstantInt::get(ObjCTypes.LongTy, 0); 2873 Values[1] = llvm::Constant::getNullValue(ObjCTypes.SelectorPtrTy); 2874 Values[2] = llvm::ConstantInt::get(ObjCTypes.ShortTy, NumClasses); 2875 Values[3] = llvm::ConstantInt::get(ObjCTypes.ShortTy, NumCategories); 2876 2877 // The runtime expects exactly the list of defined classes followed 2878 // by the list of defined categories, in a single array. 2879 std::vector<llvm::Constant*> Symbols(NumClasses + NumCategories); 2880 for (unsigned i=0; i<NumClasses; i++) 2881 Symbols[i] = llvm::ConstantExpr::getBitCast(DefinedClasses[i], 2882 ObjCTypes.Int8PtrTy); 2883 for (unsigned i=0; i<NumCategories; i++) 2884 Symbols[NumClasses + i] = 2885 llvm::ConstantExpr::getBitCast(DefinedCategories[i], 2886 ObjCTypes.Int8PtrTy); 2887 2888 Values[4] = 2889 llvm::ConstantArray::get(llvm::ArrayType::get(ObjCTypes.Int8PtrTy, 2890 NumClasses + NumCategories), 2891 Symbols); 2892 2893 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 2894 2895 llvm::GlobalVariable *GV = 2896 CreateMetadataVar("\01L_OBJC_SYMBOLS", Init, 2897 "__OBJC,__symbols,regular,no_dead_strip", 2898 4, true); 2899 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.SymtabPtrTy); 2900} 2901 2902llvm::Value *CGObjCMac::EmitClassRef(CGBuilderTy &Builder, 2903 const ObjCInterfaceDecl *ID) { 2904 LazySymbols.insert(ID->getIdentifier()); 2905 2906 llvm::GlobalVariable *&Entry = ClassReferences[ID->getIdentifier()]; 2907 2908 if (!Entry) { 2909 llvm::Constant *Casted = 2910 llvm::ConstantExpr::getBitCast(GetClassName(ID->getIdentifier()), 2911 ObjCTypes.ClassPtrTy); 2912 Entry = 2913 CreateMetadataVar("\01L_OBJC_CLASS_REFERENCES_", Casted, 2914 "__OBJC,__cls_refs,literal_pointers,no_dead_strip", 2915 4, true); 2916 } 2917 2918 return Builder.CreateLoad(Entry, false, "tmp"); 2919} 2920 2921llvm::Value *CGObjCMac::EmitSelector(CGBuilderTy &Builder, Selector Sel) { 2922 llvm::GlobalVariable *&Entry = SelectorReferences[Sel]; 2923 2924 if (!Entry) { 2925 llvm::Constant *Casted = 2926 llvm::ConstantExpr::getBitCast(GetMethodVarName(Sel), 2927 ObjCTypes.SelectorPtrTy); 2928 Entry = 2929 CreateMetadataVar("\01L_OBJC_SELECTOR_REFERENCES_", Casted, 2930 "__OBJC,__message_refs,literal_pointers,no_dead_strip", 2931 4, true); 2932 } 2933 2934 return Builder.CreateLoad(Entry, false, "tmp"); 2935} 2936 2937llvm::Constant *CGObjCCommonMac::GetClassName(IdentifierInfo *Ident) { 2938 llvm::GlobalVariable *&Entry = ClassNames[Ident]; 2939 2940 if (!Entry) 2941 Entry = CreateMetadataVar("\01L_OBJC_CLASS_NAME_", 2942 llvm::ConstantArray::get(Ident->getName()), 2943 "__TEXT,__cstring,cstring_literals", 2944 1, true); 2945 2946 return getConstantGEP(Entry, 0, 0); 2947} 2948 2949/// GetIvarLayoutName - Returns a unique constant for the given 2950/// ivar layout bitmap. 2951llvm::Constant *CGObjCCommonMac::GetIvarLayoutName(IdentifierInfo *Ident, 2952 const ObjCCommonTypesHelper &ObjCTypes) { 2953 return llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy); 2954} 2955 2956static QualType::GCAttrTypes GetGCAttrTypeForType(ASTContext &Ctx, 2957 QualType FQT) { 2958 if (FQT.isObjCGCStrong()) 2959 return QualType::Strong; 2960 2961 if (FQT.isObjCGCWeak()) 2962 return QualType::Weak; 2963 2964 if (Ctx.isObjCObjectPointerType(FQT)) 2965 return QualType::Strong; 2966 2967 if (const PointerType *PT = FQT->getAsPointerType()) 2968 return GetGCAttrTypeForType(Ctx, PT->getPointeeType()); 2969 2970 return QualType::GCNone; 2971} 2972 2973void CGObjCCommonMac::BuildAggrIvarRecordLayout(const RecordType *RT, 2974 unsigned int BytePos, 2975 bool ForStrongLayout, 2976 bool &HasUnion) { 2977 const RecordDecl *RD = RT->getDecl(); 2978 // FIXME - Use iterator. 2979 llvm::SmallVector<FieldDecl*, 16> Fields(RD->field_begin(), RD->field_end()); 2980 const llvm::Type *Ty = CGM.getTypes().ConvertType(QualType(RT, 0)); 2981 const llvm::StructLayout *RecLayout = 2982 CGM.getTargetData().getStructLayout(cast<llvm::StructType>(Ty)); 2983 2984 BuildAggrIvarLayout(0, RecLayout, RD, Fields, BytePos, 2985 ForStrongLayout, HasUnion); 2986} 2987 2988void CGObjCCommonMac::BuildAggrIvarLayout(const ObjCImplementationDecl *OI, 2989 const llvm::StructLayout *Layout, 2990 const RecordDecl *RD, 2991 const llvm::SmallVectorImpl<FieldDecl*> &RecFields, 2992 unsigned int BytePos, bool ForStrongLayout, 2993 bool &HasUnion) { 2994 bool IsUnion = (RD && RD->isUnion()); 2995 uint64_t MaxUnionIvarSize = 0; 2996 uint64_t MaxSkippedUnionIvarSize = 0; 2997 FieldDecl *MaxField = 0; 2998 FieldDecl *MaxSkippedField = 0; 2999 FieldDecl *LastFieldBitfield = 0; 3000 uint64_t MaxFieldOffset = 0; 3001 uint64_t MaxSkippedFieldOffset = 0; 3002 uint64_t LastBitfieldOffset = 0; 3003 3004 if (RecFields.empty()) 3005 return; 3006 unsigned WordSizeInBits = CGM.getContext().Target.getPointerWidth(0); 3007 unsigned ByteSizeInBits = CGM.getContext().Target.getCharWidth(); 3008 3009 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 3010 FieldDecl *Field = RecFields[i]; 3011 uint64_t FieldOffset; 3012 if (RD) 3013 FieldOffset = 3014 Layout->getElementOffset(CGM.getTypes().getLLVMFieldNo(Field)); 3015 else 3016 FieldOffset = ComputeIvarBaseOffset(CGM, OI, cast<ObjCIvarDecl>(Field)); 3017 3018 // Skip over unnamed or bitfields 3019 if (!Field->getIdentifier() || Field->isBitField()) { 3020 LastFieldBitfield = Field; 3021 LastBitfieldOffset = FieldOffset; 3022 continue; 3023 } 3024 3025 LastFieldBitfield = 0; 3026 QualType FQT = Field->getType(); 3027 if (FQT->isRecordType() || FQT->isUnionType()) { 3028 if (FQT->isUnionType()) 3029 HasUnion = true; 3030 3031 BuildAggrIvarRecordLayout(FQT->getAsRecordType(), 3032 BytePos + FieldOffset, 3033 ForStrongLayout, HasUnion); 3034 continue; 3035 } 3036 3037 if (const ArrayType *Array = CGM.getContext().getAsArrayType(FQT)) { 3038 const ConstantArrayType *CArray = 3039 dyn_cast_or_null<ConstantArrayType>(Array); 3040 uint64_t ElCount = CArray->getSize().getZExtValue(); 3041 assert(CArray && "only array with known element size is supported"); 3042 FQT = CArray->getElementType(); 3043 while (const ArrayType *Array = CGM.getContext().getAsArrayType(FQT)) { 3044 const ConstantArrayType *CArray = 3045 dyn_cast_or_null<ConstantArrayType>(Array); 3046 ElCount *= CArray->getSize().getZExtValue(); 3047 FQT = CArray->getElementType(); 3048 } 3049 3050 assert(!FQT->isUnionType() && 3051 "layout for array of unions not supported"); 3052 if (FQT->isRecordType()) { 3053 int OldIndex = IvarsInfo.size() - 1; 3054 int OldSkIndex = SkipIvars.size() -1; 3055 3056 const RecordType *RT = FQT->getAsRecordType(); 3057 BuildAggrIvarRecordLayout(RT, BytePos + FieldOffset, 3058 ForStrongLayout, HasUnion); 3059 3060 // Replicate layout information for each array element. Note that 3061 // one element is already done. 3062 uint64_t ElIx = 1; 3063 for (int FirstIndex = IvarsInfo.size() - 1, 3064 FirstSkIndex = SkipIvars.size() - 1 ;ElIx < ElCount; ElIx++) { 3065 uint64_t Size = CGM.getContext().getTypeSize(RT)/ByteSizeInBits; 3066 for (int i = OldIndex+1; i <= FirstIndex; ++i) 3067 IvarsInfo.push_back(GC_IVAR(IvarsInfo[i].ivar_bytepos + Size*ElIx, 3068 IvarsInfo[i].ivar_size)); 3069 for (int i = OldSkIndex+1; i <= FirstSkIndex; ++i) 3070 SkipIvars.push_back(GC_IVAR(SkipIvars[i].ivar_bytepos + Size*ElIx, 3071 SkipIvars[i].ivar_size)); 3072 } 3073 continue; 3074 } 3075 } 3076 // At this point, we are done with Record/Union and array there of. 3077 // For other arrays we are down to its element type. 3078 QualType::GCAttrTypes GCAttr = GetGCAttrTypeForType(CGM.getContext(), FQT); 3079 3080 unsigned FieldSize = CGM.getContext().getTypeSize(Field->getType()); 3081 if ((ForStrongLayout && GCAttr == QualType::Strong) 3082 || (!ForStrongLayout && GCAttr == QualType::Weak)) { 3083 if (IsUnion) { 3084 uint64_t UnionIvarSize = FieldSize / WordSizeInBits; 3085 if (UnionIvarSize > MaxUnionIvarSize) { 3086 MaxUnionIvarSize = UnionIvarSize; 3087 MaxField = Field; 3088 MaxFieldOffset = FieldOffset; 3089 } 3090 } else { 3091 IvarsInfo.push_back(GC_IVAR(BytePos + FieldOffset, 3092 FieldSize / WordSizeInBits)); 3093 } 3094 } else if ((ForStrongLayout && 3095 (GCAttr == QualType::GCNone || GCAttr == QualType::Weak)) 3096 || (!ForStrongLayout && GCAttr != QualType::Weak)) { 3097 if (IsUnion) { 3098 // FIXME: Why the asymmetry? We divide by word size in bits on other 3099 // side. 3100 uint64_t UnionIvarSize = FieldSize; 3101 if (UnionIvarSize > MaxSkippedUnionIvarSize) { 3102 MaxSkippedUnionIvarSize = UnionIvarSize; 3103 MaxSkippedField = Field; 3104 MaxSkippedFieldOffset = FieldOffset; 3105 } 3106 } else { 3107 // FIXME: Why the asymmetry, we divide by byte size in bits here? 3108 SkipIvars.push_back(GC_IVAR(BytePos + FieldOffset, 3109 FieldSize / ByteSizeInBits)); 3110 } 3111 } 3112 } 3113 3114 if (LastFieldBitfield) { 3115 // Last field was a bitfield. Must update skip info. 3116 Expr *BitWidth = LastFieldBitfield->getBitWidth(); 3117 uint64_t BitFieldSize = 3118 BitWidth->EvaluateAsInt(CGM.getContext()).getZExtValue(); 3119 GC_IVAR skivar; 3120 skivar.ivar_bytepos = BytePos + LastBitfieldOffset; 3121 skivar.ivar_size = (BitFieldSize / ByteSizeInBits) 3122 + ((BitFieldSize % ByteSizeInBits) != 0); 3123 SkipIvars.push_back(skivar); 3124 } 3125 3126 if (MaxField) 3127 IvarsInfo.push_back(GC_IVAR(BytePos + MaxFieldOffset, 3128 MaxUnionIvarSize)); 3129 if (MaxSkippedField) 3130 SkipIvars.push_back(GC_IVAR(BytePos + MaxSkippedFieldOffset, 3131 MaxSkippedUnionIvarSize)); 3132} 3133 3134/// BuildIvarLayout - Builds ivar layout bitmap for the class 3135/// implementation for the __strong or __weak case. 3136/// The layout map displays which words in ivar list must be skipped 3137/// and which must be scanned by GC (see below). String is built of bytes. 3138/// Each byte is divided up in two nibbles (4-bit each). Left nibble is count 3139/// of words to skip and right nibble is count of words to scan. So, each 3140/// nibble represents up to 15 workds to skip or scan. Skipping the rest is 3141/// represented by a 0x00 byte which also ends the string. 3142/// 1. when ForStrongLayout is true, following ivars are scanned: 3143/// - id, Class 3144/// - object * 3145/// - __strong anything 3146/// 3147/// 2. When ForStrongLayout is false, following ivars are scanned: 3148/// - __weak anything 3149/// 3150llvm::Constant *CGObjCCommonMac::BuildIvarLayout( 3151 const ObjCImplementationDecl *OMD, 3152 bool ForStrongLayout) { 3153 bool hasUnion = false; 3154 3155 unsigned int WordsToScan, WordsToSkip; 3156 const llvm::Type *PtrTy = llvm::PointerType::getUnqual(llvm::Type::Int8Ty); 3157 if (CGM.getLangOptions().getGCMode() == LangOptions::NonGC) 3158 return llvm::Constant::getNullValue(PtrTy); 3159 3160 llvm::SmallVector<FieldDecl*, 32> RecFields; 3161 const ObjCInterfaceDecl *OI = OMD->getClassInterface(); 3162 CGM.getContext().CollectObjCIvars(OI, RecFields); 3163 3164 // Add this implementations synthesized ivars. 3165 llvm::SmallVector<ObjCIvarDecl*, 16> Ivars; 3166 CGM.getContext().CollectSynthesizedIvars(OI, Ivars); 3167 for (unsigned k = 0, e = Ivars.size(); k != e; ++k) 3168 RecFields.push_back(cast<FieldDecl>(Ivars[k])); 3169 3170 if (RecFields.empty()) 3171 return llvm::Constant::getNullValue(PtrTy); 3172 3173 SkipIvars.clear(); 3174 IvarsInfo.clear(); 3175 3176 BuildAggrIvarLayout(OMD, 0, 0, RecFields, 0, ForStrongLayout, hasUnion); 3177 if (IvarsInfo.empty()) 3178 return llvm::Constant::getNullValue(PtrTy); 3179 3180 // Sort on byte position in case we encounterred a union nested in 3181 // the ivar list. 3182 if (hasUnion && !IvarsInfo.empty()) 3183 std::sort(IvarsInfo.begin(), IvarsInfo.end()); 3184 if (hasUnion && !SkipIvars.empty()) 3185 std::sort(SkipIvars.begin(), SkipIvars.end()); 3186 3187 // Build the string of skip/scan nibbles 3188 llvm::SmallVector<SKIP_SCAN, 32> SkipScanIvars; 3189 unsigned int WordSize = 3190 CGM.getTypes().getTargetData().getTypeAllocSize(PtrTy); 3191 if (IvarsInfo[0].ivar_bytepos == 0) { 3192 WordsToSkip = 0; 3193 WordsToScan = IvarsInfo[0].ivar_size; 3194 } else { 3195 WordsToSkip = IvarsInfo[0].ivar_bytepos/WordSize; 3196 WordsToScan = IvarsInfo[0].ivar_size; 3197 } 3198 for (unsigned int i=1, Last=IvarsInfo.size(); i != Last; i++) { 3199 unsigned int TailPrevGCObjC = 3200 IvarsInfo[i-1].ivar_bytepos + IvarsInfo[i-1].ivar_size * WordSize; 3201 if (IvarsInfo[i].ivar_bytepos == TailPrevGCObjC) { 3202 // consecutive 'scanned' object pointers. 3203 WordsToScan += IvarsInfo[i].ivar_size; 3204 } else { 3205 // Skip over 'gc'able object pointer which lay over each other. 3206 if (TailPrevGCObjC > IvarsInfo[i].ivar_bytepos) 3207 continue; 3208 // Must skip over 1 or more words. We save current skip/scan values 3209 // and start a new pair. 3210 SKIP_SCAN SkScan; 3211 SkScan.skip = WordsToSkip; 3212 SkScan.scan = WordsToScan; 3213 SkipScanIvars.push_back(SkScan); 3214 3215 // Skip the hole. 3216 SkScan.skip = (IvarsInfo[i].ivar_bytepos - TailPrevGCObjC) / WordSize; 3217 SkScan.scan = 0; 3218 SkipScanIvars.push_back(SkScan); 3219 WordsToSkip = 0; 3220 WordsToScan = IvarsInfo[i].ivar_size; 3221 } 3222 } 3223 if (WordsToScan > 0) { 3224 SKIP_SCAN SkScan; 3225 SkScan.skip = WordsToSkip; 3226 SkScan.scan = WordsToScan; 3227 SkipScanIvars.push_back(SkScan); 3228 } 3229 3230 bool BytesSkipped = false; 3231 if (!SkipIvars.empty()) { 3232 unsigned int LastIndex = SkipIvars.size()-1; 3233 int LastByteSkipped = 3234 SkipIvars[LastIndex].ivar_bytepos + SkipIvars[LastIndex].ivar_size; 3235 LastIndex = IvarsInfo.size()-1; 3236 int LastByteScanned = 3237 IvarsInfo[LastIndex].ivar_bytepos + 3238 IvarsInfo[LastIndex].ivar_size * WordSize; 3239 BytesSkipped = (LastByteSkipped > LastByteScanned); 3240 // Compute number of bytes to skip at the tail end of the last ivar scanned. 3241 if (BytesSkipped) { 3242 unsigned int TotalWords = (LastByteSkipped + (WordSize -1)) / WordSize; 3243 SKIP_SCAN SkScan; 3244 SkScan.skip = TotalWords - (LastByteScanned/WordSize); 3245 SkScan.scan = 0; 3246 SkipScanIvars.push_back(SkScan); 3247 } 3248 } 3249 // Mini optimization of nibbles such that an 0xM0 followed by 0x0N is produced 3250 // as 0xMN. 3251 int SkipScan = SkipScanIvars.size()-1; 3252 for (int i = 0; i <= SkipScan; i++) { 3253 if ((i < SkipScan) && SkipScanIvars[i].skip && SkipScanIvars[i].scan == 0 3254 && SkipScanIvars[i+1].skip == 0 && SkipScanIvars[i+1].scan) { 3255 // 0xM0 followed by 0x0N detected. 3256 SkipScanIvars[i].scan = SkipScanIvars[i+1].scan; 3257 for (int j = i+1; j < SkipScan; j++) 3258 SkipScanIvars[j] = SkipScanIvars[j+1]; 3259 --SkipScan; 3260 } 3261 } 3262 3263 // Generate the string. 3264 std::string BitMap; 3265 for (int i = 0; i <= SkipScan; i++) { 3266 unsigned char byte; 3267 unsigned int skip_small = SkipScanIvars[i].skip % 0xf; 3268 unsigned int scan_small = SkipScanIvars[i].scan % 0xf; 3269 unsigned int skip_big = SkipScanIvars[i].skip / 0xf; 3270 unsigned int scan_big = SkipScanIvars[i].scan / 0xf; 3271 3272 if (skip_small > 0 || skip_big > 0) 3273 BytesSkipped = true; 3274 // first skip big. 3275 for (unsigned int ix = 0; ix < skip_big; ix++) 3276 BitMap += (unsigned char)(0xf0); 3277 3278 // next (skip small, scan) 3279 if (skip_small) { 3280 byte = skip_small << 4; 3281 if (scan_big > 0) { 3282 byte |= 0xf; 3283 --scan_big; 3284 } else if (scan_small) { 3285 byte |= scan_small; 3286 scan_small = 0; 3287 } 3288 BitMap += byte; 3289 } 3290 // next scan big 3291 for (unsigned int ix = 0; ix < scan_big; ix++) 3292 BitMap += (unsigned char)(0x0f); 3293 // last scan small 3294 if (scan_small) { 3295 byte = scan_small; 3296 BitMap += byte; 3297 } 3298 } 3299 // null terminate string. 3300 unsigned char zero = 0; 3301 BitMap += zero; 3302 3303 if (CGM.getLangOptions().ObjCGCBitmapPrint) { 3304 printf("\n%s ivar layout for class '%s': ", 3305 ForStrongLayout ? "strong" : "weak", 3306 OMD->getClassInterface()->getNameAsCString()); 3307 const unsigned char *s = (unsigned char*)BitMap.c_str(); 3308 for (unsigned i = 0; i < BitMap.size(); i++) 3309 if (!(s[i] & 0xf0)) 3310 printf("0x0%x%s", s[i], s[i] != 0 ? ", " : ""); 3311 else 3312 printf("0x%x%s", s[i], s[i] != 0 ? ", " : ""); 3313 printf("\n"); 3314 } 3315 3316 // if ivar_layout bitmap is all 1 bits (nothing skipped) then use NULL as 3317 // final layout. 3318 if (ForStrongLayout && !BytesSkipped) 3319 return llvm::Constant::getNullValue(PtrTy); 3320 llvm::GlobalVariable * Entry = CreateMetadataVar("\01L_OBJC_CLASS_NAME_", 3321 llvm::ConstantArray::get(BitMap.c_str()), 3322 "__TEXT,__cstring,cstring_literals", 3323 1, true); 3324 return getConstantGEP(Entry, 0, 0); 3325} 3326 3327llvm::Constant *CGObjCCommonMac::GetMethodVarName(Selector Sel) { 3328 llvm::GlobalVariable *&Entry = MethodVarNames[Sel]; 3329 3330 // FIXME: Avoid std::string copying. 3331 if (!Entry) 3332 Entry = CreateMetadataVar("\01L_OBJC_METH_VAR_NAME_", 3333 llvm::ConstantArray::get(Sel.getAsString()), 3334 "__TEXT,__cstring,cstring_literals", 3335 1, true); 3336 3337 return getConstantGEP(Entry, 0, 0); 3338} 3339 3340// FIXME: Merge into a single cstring creation function. 3341llvm::Constant *CGObjCCommonMac::GetMethodVarName(IdentifierInfo *ID) { 3342 return GetMethodVarName(CGM.getContext().Selectors.getNullarySelector(ID)); 3343} 3344 3345// FIXME: Merge into a single cstring creation function. 3346llvm::Constant *CGObjCCommonMac::GetMethodVarName(const std::string &Name) { 3347 return GetMethodVarName(&CGM.getContext().Idents.get(Name)); 3348} 3349 3350llvm::Constant *CGObjCCommonMac::GetMethodVarType(const FieldDecl *Field) { 3351 std::string TypeStr; 3352 CGM.getContext().getObjCEncodingForType(Field->getType(), TypeStr, Field); 3353 3354 llvm::GlobalVariable *&Entry = MethodVarTypes[TypeStr]; 3355 3356 if (!Entry) 3357 Entry = CreateMetadataVar("\01L_OBJC_METH_VAR_TYPE_", 3358 llvm::ConstantArray::get(TypeStr), 3359 "__TEXT,__cstring,cstring_literals", 3360 1, true); 3361 3362 return getConstantGEP(Entry, 0, 0); 3363} 3364 3365llvm::Constant *CGObjCCommonMac::GetMethodVarType(const ObjCMethodDecl *D) { 3366 std::string TypeStr; 3367 CGM.getContext().getObjCEncodingForMethodDecl(const_cast<ObjCMethodDecl*>(D), 3368 TypeStr); 3369 3370 llvm::GlobalVariable *&Entry = MethodVarTypes[TypeStr]; 3371 3372 if (!Entry) 3373 Entry = CreateMetadataVar("\01L_OBJC_METH_VAR_TYPE_", 3374 llvm::ConstantArray::get(TypeStr), 3375 "__TEXT,__cstring,cstring_literals", 3376 1, true); 3377 3378 return getConstantGEP(Entry, 0, 0); 3379} 3380 3381// FIXME: Merge into a single cstring creation function. 3382llvm::Constant *CGObjCCommonMac::GetPropertyName(IdentifierInfo *Ident) { 3383 llvm::GlobalVariable *&Entry = PropertyNames[Ident]; 3384 3385 if (!Entry) 3386 Entry = CreateMetadataVar("\01L_OBJC_PROP_NAME_ATTR_", 3387 llvm::ConstantArray::get(Ident->getName()), 3388 "__TEXT,__cstring,cstring_literals", 3389 1, true); 3390 3391 return getConstantGEP(Entry, 0, 0); 3392} 3393 3394// FIXME: Merge into a single cstring creation function. 3395// FIXME: This Decl should be more precise. 3396llvm::Constant * 3397 CGObjCCommonMac::GetPropertyTypeString(const ObjCPropertyDecl *PD, 3398 const Decl *Container) { 3399 std::string TypeStr; 3400 CGM.getContext().getObjCEncodingForPropertyDecl(PD, Container, TypeStr); 3401 return GetPropertyName(&CGM.getContext().Idents.get(TypeStr)); 3402} 3403 3404void CGObjCCommonMac::GetNameForMethod(const ObjCMethodDecl *D, 3405 const ObjCContainerDecl *CD, 3406 std::string &NameOut) { 3407 NameOut = '\01'; 3408 NameOut += (D->isInstanceMethod() ? '-' : '+'); 3409 NameOut += '['; 3410 assert (CD && "Missing container decl in GetNameForMethod"); 3411 NameOut += CD->getNameAsString(); 3412 if (const ObjCCategoryImplDecl *CID = 3413 dyn_cast<ObjCCategoryImplDecl>(D->getDeclContext())) { 3414 NameOut += '('; 3415 NameOut += CID->getNameAsString(); 3416 NameOut+= ')'; 3417 } 3418 NameOut += ' '; 3419 NameOut += D->getSelector().getAsString(); 3420 NameOut += ']'; 3421} 3422 3423void CGObjCCommonMac::MergeMetadataGlobals( 3424 std::vector<llvm::Constant*> &UsedArray) { 3425 llvm::Type *i8PTy = llvm::PointerType::getUnqual(llvm::Type::Int8Ty); 3426 for (std::vector<llvm::GlobalVariable*>::iterator i = UsedGlobals.begin(), 3427 e = UsedGlobals.end(); i != e; ++i) { 3428 UsedArray.push_back(llvm::ConstantExpr::getBitCast(cast<llvm::Constant>(*i), 3429 i8PTy)); 3430 } 3431} 3432 3433void CGObjCMac::FinishModule() { 3434 EmitModuleInfo(); 3435 3436 // Emit the dummy bodies for any protocols which were referenced but 3437 // never defined. 3438 for (llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*>::iterator 3439 i = Protocols.begin(), e = Protocols.end(); i != e; ++i) { 3440 if (i->second->hasInitializer()) 3441 continue; 3442 3443 std::vector<llvm::Constant*> Values(5); 3444 Values[0] = llvm::Constant::getNullValue(ObjCTypes.ProtocolExtensionPtrTy); 3445 Values[1] = GetClassName(i->first); 3446 Values[2] = llvm::Constant::getNullValue(ObjCTypes.ProtocolListPtrTy); 3447 Values[3] = Values[4] = 3448 llvm::Constant::getNullValue(ObjCTypes.MethodDescriptionListPtrTy); 3449 i->second->setLinkage(llvm::GlobalValue::InternalLinkage); 3450 i->second->setInitializer(llvm::ConstantStruct::get(ObjCTypes.ProtocolTy, 3451 Values)); 3452 } 3453 3454 // Add assembler directives to add lazy undefined symbol references 3455 // for classes which are referenced but not defined. This is 3456 // important for correct linker interaction. 3457 3458 // FIXME: Uh, this isn't particularly portable. 3459 std::stringstream s; 3460 3461 if (!CGM.getModule().getModuleInlineAsm().empty()) 3462 s << "\n"; 3463 3464 for (std::set<IdentifierInfo*>::iterator i = LazySymbols.begin(), 3465 e = LazySymbols.end(); i != e; ++i) { 3466 s << "\t.lazy_reference .objc_class_name_" << (*i)->getName() << "\n"; 3467 } 3468 for (std::set<IdentifierInfo*>::iterator i = DefinedSymbols.begin(), 3469 e = DefinedSymbols.end(); i != e; ++i) { 3470 s << "\t.objc_class_name_" << (*i)->getName() << "=0\n" 3471 << "\t.globl .objc_class_name_" << (*i)->getName() << "\n"; 3472 } 3473 3474 CGM.getModule().appendModuleInlineAsm(s.str()); 3475} 3476 3477CGObjCNonFragileABIMac::CGObjCNonFragileABIMac(CodeGen::CodeGenModule &cgm) 3478 : CGObjCCommonMac(cgm), 3479 ObjCTypes(cgm) 3480{ 3481 ObjCEmptyCacheVar = ObjCEmptyVtableVar = NULL; 3482 ObjCABI = 2; 3483} 3484 3485/* *** */ 3486 3487ObjCCommonTypesHelper::ObjCCommonTypesHelper(CodeGen::CodeGenModule &cgm) 3488: CGM(cgm) 3489{ 3490 CodeGen::CodeGenTypes &Types = CGM.getTypes(); 3491 ASTContext &Ctx = CGM.getContext(); 3492 3493 ShortTy = Types.ConvertType(Ctx.ShortTy); 3494 IntTy = Types.ConvertType(Ctx.IntTy); 3495 LongTy = Types.ConvertType(Ctx.LongTy); 3496 LongLongTy = Types.ConvertType(Ctx.LongLongTy); 3497 Int8PtrTy = llvm::PointerType::getUnqual(llvm::Type::Int8Ty); 3498 3499 ObjectPtrTy = Types.ConvertType(Ctx.getObjCIdType()); 3500 PtrObjectPtrTy = llvm::PointerType::getUnqual(ObjectPtrTy); 3501 SelectorPtrTy = Types.ConvertType(Ctx.getObjCSelType()); 3502 3503 // FIXME: It would be nice to unify this with the opaque type, so that the IR 3504 // comes out a bit cleaner. 3505 const llvm::Type *T = Types.ConvertType(Ctx.getObjCProtoType()); 3506 ExternalProtocolPtrTy = llvm::PointerType::getUnqual(T); 3507 3508 // I'm not sure I like this. The implicit coordination is a bit 3509 // gross. We should solve this in a reasonable fashion because this 3510 // is a pretty common task (match some runtime data structure with 3511 // an LLVM data structure). 3512 3513 // FIXME: This is leaked. 3514 // FIXME: Merge with rewriter code? 3515 3516 // struct _objc_super { 3517 // id self; 3518 // Class cls; 3519 // } 3520 RecordDecl *RD = RecordDecl::Create(Ctx, TagDecl::TK_struct, 0, 3521 SourceLocation(), 3522 &Ctx.Idents.get("_objc_super")); 3523 RD->addDecl(FieldDecl::Create(Ctx, RD, SourceLocation(), 0, 3524 Ctx.getObjCIdType(), 0, false)); 3525 RD->addDecl(FieldDecl::Create(Ctx, RD, SourceLocation(), 0, 3526 Ctx.getObjCClassType(), 0, false)); 3527 RD->completeDefinition(Ctx); 3528 3529 SuperCTy = Ctx.getTagDeclType(RD); 3530 SuperPtrCTy = Ctx.getPointerType(SuperCTy); 3531 3532 SuperTy = cast<llvm::StructType>(Types.ConvertType(SuperCTy)); 3533 SuperPtrTy = llvm::PointerType::getUnqual(SuperTy); 3534 3535 // struct _prop_t { 3536 // char *name; 3537 // char *attributes; 3538 // } 3539 PropertyTy = llvm::StructType::get(Int8PtrTy, Int8PtrTy, NULL); 3540 CGM.getModule().addTypeName("struct._prop_t", 3541 PropertyTy); 3542 3543 // struct _prop_list_t { 3544 // uint32_t entsize; // sizeof(struct _prop_t) 3545 // uint32_t count_of_properties; 3546 // struct _prop_t prop_list[count_of_properties]; 3547 // } 3548 PropertyListTy = llvm::StructType::get(IntTy, 3549 IntTy, 3550 llvm::ArrayType::get(PropertyTy, 0), 3551 NULL); 3552 CGM.getModule().addTypeName("struct._prop_list_t", 3553 PropertyListTy); 3554 // struct _prop_list_t * 3555 PropertyListPtrTy = llvm::PointerType::getUnqual(PropertyListTy); 3556 3557 // struct _objc_method { 3558 // SEL _cmd; 3559 // char *method_type; 3560 // char *_imp; 3561 // } 3562 MethodTy = llvm::StructType::get(SelectorPtrTy, 3563 Int8PtrTy, 3564 Int8PtrTy, 3565 NULL); 3566 CGM.getModule().addTypeName("struct._objc_method", MethodTy); 3567 3568 // struct _objc_cache * 3569 CacheTy = llvm::OpaqueType::get(); 3570 CGM.getModule().addTypeName("struct._objc_cache", CacheTy); 3571 CachePtrTy = llvm::PointerType::getUnqual(CacheTy); 3572} 3573 3574ObjCTypesHelper::ObjCTypesHelper(CodeGen::CodeGenModule &cgm) 3575 : ObjCCommonTypesHelper(cgm) 3576{ 3577 // struct _objc_method_description { 3578 // SEL name; 3579 // char *types; 3580 // } 3581 MethodDescriptionTy = 3582 llvm::StructType::get(SelectorPtrTy, 3583 Int8PtrTy, 3584 NULL); 3585 CGM.getModule().addTypeName("struct._objc_method_description", 3586 MethodDescriptionTy); 3587 3588 // struct _objc_method_description_list { 3589 // int count; 3590 // struct _objc_method_description[1]; 3591 // } 3592 MethodDescriptionListTy = 3593 llvm::StructType::get(IntTy, 3594 llvm::ArrayType::get(MethodDescriptionTy, 0), 3595 NULL); 3596 CGM.getModule().addTypeName("struct._objc_method_description_list", 3597 MethodDescriptionListTy); 3598 3599 // struct _objc_method_description_list * 3600 MethodDescriptionListPtrTy = 3601 llvm::PointerType::getUnqual(MethodDescriptionListTy); 3602 3603 // Protocol description structures 3604 3605 // struct _objc_protocol_extension { 3606 // uint32_t size; // sizeof(struct _objc_protocol_extension) 3607 // struct _objc_method_description_list *optional_instance_methods; 3608 // struct _objc_method_description_list *optional_class_methods; 3609 // struct _objc_property_list *instance_properties; 3610 // } 3611 ProtocolExtensionTy = 3612 llvm::StructType::get(IntTy, 3613 MethodDescriptionListPtrTy, 3614 MethodDescriptionListPtrTy, 3615 PropertyListPtrTy, 3616 NULL); 3617 CGM.getModule().addTypeName("struct._objc_protocol_extension", 3618 ProtocolExtensionTy); 3619 3620 // struct _objc_protocol_extension * 3621 ProtocolExtensionPtrTy = llvm::PointerType::getUnqual(ProtocolExtensionTy); 3622 3623 // Handle recursive construction of Protocol and ProtocolList types 3624 3625 llvm::PATypeHolder ProtocolTyHolder = llvm::OpaqueType::get(); 3626 llvm::PATypeHolder ProtocolListTyHolder = llvm::OpaqueType::get(); 3627 3628 const llvm::Type *T = 3629 llvm::StructType::get(llvm::PointerType::getUnqual(ProtocolListTyHolder), 3630 LongTy, 3631 llvm::ArrayType::get(ProtocolTyHolder, 0), 3632 NULL); 3633 cast<llvm::OpaqueType>(ProtocolListTyHolder.get())->refineAbstractTypeTo(T); 3634 3635 // struct _objc_protocol { 3636 // struct _objc_protocol_extension *isa; 3637 // char *protocol_name; 3638 // struct _objc_protocol **_objc_protocol_list; 3639 // struct _objc_method_description_list *instance_methods; 3640 // struct _objc_method_description_list *class_methods; 3641 // } 3642 T = llvm::StructType::get(ProtocolExtensionPtrTy, 3643 Int8PtrTy, 3644 llvm::PointerType::getUnqual(ProtocolListTyHolder), 3645 MethodDescriptionListPtrTy, 3646 MethodDescriptionListPtrTy, 3647 NULL); 3648 cast<llvm::OpaqueType>(ProtocolTyHolder.get())->refineAbstractTypeTo(T); 3649 3650 ProtocolListTy = cast<llvm::StructType>(ProtocolListTyHolder.get()); 3651 CGM.getModule().addTypeName("struct._objc_protocol_list", 3652 ProtocolListTy); 3653 // struct _objc_protocol_list * 3654 ProtocolListPtrTy = llvm::PointerType::getUnqual(ProtocolListTy); 3655 3656 ProtocolTy = cast<llvm::StructType>(ProtocolTyHolder.get()); 3657 CGM.getModule().addTypeName("struct._objc_protocol", ProtocolTy); 3658 ProtocolPtrTy = llvm::PointerType::getUnqual(ProtocolTy); 3659 3660 // Class description structures 3661 3662 // struct _objc_ivar { 3663 // char *ivar_name; 3664 // char *ivar_type; 3665 // int ivar_offset; 3666 // } 3667 IvarTy = llvm::StructType::get(Int8PtrTy, 3668 Int8PtrTy, 3669 IntTy, 3670 NULL); 3671 CGM.getModule().addTypeName("struct._objc_ivar", IvarTy); 3672 3673 // struct _objc_ivar_list * 3674 IvarListTy = llvm::OpaqueType::get(); 3675 CGM.getModule().addTypeName("struct._objc_ivar_list", IvarListTy); 3676 IvarListPtrTy = llvm::PointerType::getUnqual(IvarListTy); 3677 3678 // struct _objc_method_list * 3679 MethodListTy = llvm::OpaqueType::get(); 3680 CGM.getModule().addTypeName("struct._objc_method_list", MethodListTy); 3681 MethodListPtrTy = llvm::PointerType::getUnqual(MethodListTy); 3682 3683 // struct _objc_class_extension * 3684 ClassExtensionTy = 3685 llvm::StructType::get(IntTy, 3686 Int8PtrTy, 3687 PropertyListPtrTy, 3688 NULL); 3689 CGM.getModule().addTypeName("struct._objc_class_extension", ClassExtensionTy); 3690 ClassExtensionPtrTy = llvm::PointerType::getUnqual(ClassExtensionTy); 3691 3692 llvm::PATypeHolder ClassTyHolder = llvm::OpaqueType::get(); 3693 3694 // struct _objc_class { 3695 // Class isa; 3696 // Class super_class; 3697 // char *name; 3698 // long version; 3699 // long info; 3700 // long instance_size; 3701 // struct _objc_ivar_list *ivars; 3702 // struct _objc_method_list *methods; 3703 // struct _objc_cache *cache; 3704 // struct _objc_protocol_list *protocols; 3705 // char *ivar_layout; 3706 // struct _objc_class_ext *ext; 3707 // }; 3708 T = llvm::StructType::get(llvm::PointerType::getUnqual(ClassTyHolder), 3709 llvm::PointerType::getUnqual(ClassTyHolder), 3710 Int8PtrTy, 3711 LongTy, 3712 LongTy, 3713 LongTy, 3714 IvarListPtrTy, 3715 MethodListPtrTy, 3716 CachePtrTy, 3717 ProtocolListPtrTy, 3718 Int8PtrTy, 3719 ClassExtensionPtrTy, 3720 NULL); 3721 cast<llvm::OpaqueType>(ClassTyHolder.get())->refineAbstractTypeTo(T); 3722 3723 ClassTy = cast<llvm::StructType>(ClassTyHolder.get()); 3724 CGM.getModule().addTypeName("struct._objc_class", ClassTy); 3725 ClassPtrTy = llvm::PointerType::getUnqual(ClassTy); 3726 3727 // struct _objc_category { 3728 // char *category_name; 3729 // char *class_name; 3730 // struct _objc_method_list *instance_method; 3731 // struct _objc_method_list *class_method; 3732 // uint32_t size; // sizeof(struct _objc_category) 3733 // struct _objc_property_list *instance_properties;// category's @property 3734 // } 3735 CategoryTy = llvm::StructType::get(Int8PtrTy, 3736 Int8PtrTy, 3737 MethodListPtrTy, 3738 MethodListPtrTy, 3739 ProtocolListPtrTy, 3740 IntTy, 3741 PropertyListPtrTy, 3742 NULL); 3743 CGM.getModule().addTypeName("struct._objc_category", CategoryTy); 3744 3745 // Global metadata structures 3746 3747 // struct _objc_symtab { 3748 // long sel_ref_cnt; 3749 // SEL *refs; 3750 // short cls_def_cnt; 3751 // short cat_def_cnt; 3752 // char *defs[cls_def_cnt + cat_def_cnt]; 3753 // } 3754 SymtabTy = llvm::StructType::get(LongTy, 3755 SelectorPtrTy, 3756 ShortTy, 3757 ShortTy, 3758 llvm::ArrayType::get(Int8PtrTy, 0), 3759 NULL); 3760 CGM.getModule().addTypeName("struct._objc_symtab", SymtabTy); 3761 SymtabPtrTy = llvm::PointerType::getUnqual(SymtabTy); 3762 3763 // struct _objc_module { 3764 // long version; 3765 // long size; // sizeof(struct _objc_module) 3766 // char *name; 3767 // struct _objc_symtab* symtab; 3768 // } 3769 ModuleTy = 3770 llvm::StructType::get(LongTy, 3771 LongTy, 3772 Int8PtrTy, 3773 SymtabPtrTy, 3774 NULL); 3775 CGM.getModule().addTypeName("struct._objc_module", ModuleTy); 3776 3777 3778 // FIXME: This is the size of the setjmp buffer and should be target 3779 // specific. 18 is what's used on 32-bit X86. 3780 uint64_t SetJmpBufferSize = 18; 3781 3782 // Exceptions 3783 const llvm::Type *StackPtrTy = 3784 llvm::ArrayType::get(llvm::PointerType::getUnqual(llvm::Type::Int8Ty), 4); 3785 3786 ExceptionDataTy = 3787 llvm::StructType::get(llvm::ArrayType::get(llvm::Type::Int32Ty, 3788 SetJmpBufferSize), 3789 StackPtrTy, NULL); 3790 CGM.getModule().addTypeName("struct._objc_exception_data", 3791 ExceptionDataTy); 3792 3793} 3794 3795ObjCNonFragileABITypesHelper::ObjCNonFragileABITypesHelper(CodeGen::CodeGenModule &cgm) 3796: ObjCCommonTypesHelper(cgm) 3797{ 3798 // struct _method_list_t { 3799 // uint32_t entsize; // sizeof(struct _objc_method) 3800 // uint32_t method_count; 3801 // struct _objc_method method_list[method_count]; 3802 // } 3803 MethodListnfABITy = llvm::StructType::get(IntTy, 3804 IntTy, 3805 llvm::ArrayType::get(MethodTy, 0), 3806 NULL); 3807 CGM.getModule().addTypeName("struct.__method_list_t", 3808 MethodListnfABITy); 3809 // struct method_list_t * 3810 MethodListnfABIPtrTy = llvm::PointerType::getUnqual(MethodListnfABITy); 3811 3812 // struct _protocol_t { 3813 // id isa; // NULL 3814 // const char * const protocol_name; 3815 // const struct _protocol_list_t * protocol_list; // super protocols 3816 // const struct method_list_t * const instance_methods; 3817 // const struct method_list_t * const class_methods; 3818 // const struct method_list_t *optionalInstanceMethods; 3819 // const struct method_list_t *optionalClassMethods; 3820 // const struct _prop_list_t * properties; 3821 // const uint32_t size; // sizeof(struct _protocol_t) 3822 // const uint32_t flags; // = 0 3823 // } 3824 3825 // Holder for struct _protocol_list_t * 3826 llvm::PATypeHolder ProtocolListTyHolder = llvm::OpaqueType::get(); 3827 3828 ProtocolnfABITy = llvm::StructType::get(ObjectPtrTy, 3829 Int8PtrTy, 3830 llvm::PointerType::getUnqual( 3831 ProtocolListTyHolder), 3832 MethodListnfABIPtrTy, 3833 MethodListnfABIPtrTy, 3834 MethodListnfABIPtrTy, 3835 MethodListnfABIPtrTy, 3836 PropertyListPtrTy, 3837 IntTy, 3838 IntTy, 3839 NULL); 3840 CGM.getModule().addTypeName("struct._protocol_t", 3841 ProtocolnfABITy); 3842 3843 // struct _protocol_t* 3844 ProtocolnfABIPtrTy = llvm::PointerType::getUnqual(ProtocolnfABITy); 3845 3846 // struct _protocol_list_t { 3847 // long protocol_count; // Note, this is 32/64 bit 3848 // struct _protocol_t *[protocol_count]; 3849 // } 3850 ProtocolListnfABITy = llvm::StructType::get(LongTy, 3851 llvm::ArrayType::get( 3852 ProtocolnfABIPtrTy, 0), 3853 NULL); 3854 CGM.getModule().addTypeName("struct._objc_protocol_list", 3855 ProtocolListnfABITy); 3856 cast<llvm::OpaqueType>(ProtocolListTyHolder.get())->refineAbstractTypeTo( 3857 ProtocolListnfABITy); 3858 3859 // struct _objc_protocol_list* 3860 ProtocolListnfABIPtrTy = llvm::PointerType::getUnqual(ProtocolListnfABITy); 3861 3862 // struct _ivar_t { 3863 // unsigned long int *offset; // pointer to ivar offset location 3864 // char *name; 3865 // char *type; 3866 // uint32_t alignment; 3867 // uint32_t size; 3868 // } 3869 IvarnfABITy = llvm::StructType::get(llvm::PointerType::getUnqual(LongTy), 3870 Int8PtrTy, 3871 Int8PtrTy, 3872 IntTy, 3873 IntTy, 3874 NULL); 3875 CGM.getModule().addTypeName("struct._ivar_t", IvarnfABITy); 3876 3877 // struct _ivar_list_t { 3878 // uint32 entsize; // sizeof(struct _ivar_t) 3879 // uint32 count; 3880 // struct _iver_t list[count]; 3881 // } 3882 IvarListnfABITy = llvm::StructType::get(IntTy, 3883 IntTy, 3884 llvm::ArrayType::get( 3885 IvarnfABITy, 0), 3886 NULL); 3887 CGM.getModule().addTypeName("struct._ivar_list_t", IvarListnfABITy); 3888 3889 IvarListnfABIPtrTy = llvm::PointerType::getUnqual(IvarListnfABITy); 3890 3891 // struct _class_ro_t { 3892 // uint32_t const flags; 3893 // uint32_t const instanceStart; 3894 // uint32_t const instanceSize; 3895 // uint32_t const reserved; // only when building for 64bit targets 3896 // const uint8_t * const ivarLayout; 3897 // const char *const name; 3898 // const struct _method_list_t * const baseMethods; 3899 // const struct _objc_protocol_list *const baseProtocols; 3900 // const struct _ivar_list_t *const ivars; 3901 // const uint8_t * const weakIvarLayout; 3902 // const struct _prop_list_t * const properties; 3903 // } 3904 3905 // FIXME. Add 'reserved' field in 64bit abi mode! 3906 ClassRonfABITy = llvm::StructType::get(IntTy, 3907 IntTy, 3908 IntTy, 3909 Int8PtrTy, 3910 Int8PtrTy, 3911 MethodListnfABIPtrTy, 3912 ProtocolListnfABIPtrTy, 3913 IvarListnfABIPtrTy, 3914 Int8PtrTy, 3915 PropertyListPtrTy, 3916 NULL); 3917 CGM.getModule().addTypeName("struct._class_ro_t", 3918 ClassRonfABITy); 3919 3920 // ImpnfABITy - LLVM for id (*)(id, SEL, ...) 3921 std::vector<const llvm::Type*> Params; 3922 Params.push_back(ObjectPtrTy); 3923 Params.push_back(SelectorPtrTy); 3924 ImpnfABITy = llvm::PointerType::getUnqual( 3925 llvm::FunctionType::get(ObjectPtrTy, Params, false)); 3926 3927 // struct _class_t { 3928 // struct _class_t *isa; 3929 // struct _class_t * const superclass; 3930 // void *cache; 3931 // IMP *vtable; 3932 // struct class_ro_t *ro; 3933 // } 3934 3935 llvm::PATypeHolder ClassTyHolder = llvm::OpaqueType::get(); 3936 ClassnfABITy = llvm::StructType::get(llvm::PointerType::getUnqual(ClassTyHolder), 3937 llvm::PointerType::getUnqual(ClassTyHolder), 3938 CachePtrTy, 3939 llvm::PointerType::getUnqual(ImpnfABITy), 3940 llvm::PointerType::getUnqual( 3941 ClassRonfABITy), 3942 NULL); 3943 CGM.getModule().addTypeName("struct._class_t", ClassnfABITy); 3944 3945 cast<llvm::OpaqueType>(ClassTyHolder.get())->refineAbstractTypeTo( 3946 ClassnfABITy); 3947 3948 // LLVM for struct _class_t * 3949 ClassnfABIPtrTy = llvm::PointerType::getUnqual(ClassnfABITy); 3950 3951 // struct _category_t { 3952 // const char * const name; 3953 // struct _class_t *const cls; 3954 // const struct _method_list_t * const instance_methods; 3955 // const struct _method_list_t * const class_methods; 3956 // const struct _protocol_list_t * const protocols; 3957 // const struct _prop_list_t * const properties; 3958 // } 3959 CategorynfABITy = llvm::StructType::get(Int8PtrTy, 3960 ClassnfABIPtrTy, 3961 MethodListnfABIPtrTy, 3962 MethodListnfABIPtrTy, 3963 ProtocolListnfABIPtrTy, 3964 PropertyListPtrTy, 3965 NULL); 3966 CGM.getModule().addTypeName("struct._category_t", CategorynfABITy); 3967 3968 // New types for nonfragile abi messaging. 3969 CodeGen::CodeGenTypes &Types = CGM.getTypes(); 3970 ASTContext &Ctx = CGM.getContext(); 3971 3972 // MessageRefTy - LLVM for: 3973 // struct _message_ref_t { 3974 // IMP messenger; 3975 // SEL name; 3976 // }; 3977 3978 // First the clang type for struct _message_ref_t 3979 RecordDecl *RD = RecordDecl::Create(Ctx, TagDecl::TK_struct, 0, 3980 SourceLocation(), 3981 &Ctx.Idents.get("_message_ref_t")); 3982 RD->addDecl(FieldDecl::Create(Ctx, RD, SourceLocation(), 0, 3983 Ctx.VoidPtrTy, 0, false)); 3984 RD->addDecl(FieldDecl::Create(Ctx, RD, SourceLocation(), 0, 3985 Ctx.getObjCSelType(), 0, false)); 3986 RD->completeDefinition(Ctx); 3987 3988 MessageRefCTy = Ctx.getTagDeclType(RD); 3989 MessageRefCPtrTy = Ctx.getPointerType(MessageRefCTy); 3990 MessageRefTy = cast<llvm::StructType>(Types.ConvertType(MessageRefCTy)); 3991 3992 // MessageRefPtrTy - LLVM for struct _message_ref_t* 3993 MessageRefPtrTy = llvm::PointerType::getUnqual(MessageRefTy); 3994 3995 // SuperMessageRefTy - LLVM for: 3996 // struct _super_message_ref_t { 3997 // SUPER_IMP messenger; 3998 // SEL name; 3999 // }; 4000 SuperMessageRefTy = llvm::StructType::get(ImpnfABITy, 4001 SelectorPtrTy, 4002 NULL); 4003 CGM.getModule().addTypeName("struct._super_message_ref_t", SuperMessageRefTy); 4004 4005 // SuperMessageRefPtrTy - LLVM for struct _super_message_ref_t* 4006 SuperMessageRefPtrTy = llvm::PointerType::getUnqual(SuperMessageRefTy); 4007 4008 4009 // struct objc_typeinfo { 4010 // const void** vtable; // objc_ehtype_vtable + 2 4011 // const char* name; // c++ typeinfo string 4012 // Class cls; 4013 // }; 4014 EHTypeTy = llvm::StructType::get(llvm::PointerType::getUnqual(Int8PtrTy), 4015 Int8PtrTy, 4016 ClassnfABIPtrTy, 4017 NULL); 4018 CGM.getModule().addTypeName("struct._objc_typeinfo", EHTypeTy); 4019 EHTypePtrTy = llvm::PointerType::getUnqual(EHTypeTy); 4020} 4021 4022llvm::Function *CGObjCNonFragileABIMac::ModuleInitFunction() { 4023 FinishNonFragileABIModule(); 4024 4025 return NULL; 4026} 4027 4028void CGObjCNonFragileABIMac::AddModuleClassList(const 4029 std::vector<llvm::GlobalValue*> 4030 &Container, 4031 const char *SymbolName, 4032 const char *SectionName) { 4033 unsigned NumClasses = Container.size(); 4034 4035 if (!NumClasses) 4036 return; 4037 4038 std::vector<llvm::Constant*> Symbols(NumClasses); 4039 for (unsigned i=0; i<NumClasses; i++) 4040 Symbols[i] = llvm::ConstantExpr::getBitCast(Container[i], 4041 ObjCTypes.Int8PtrTy); 4042 llvm::Constant* Init = 4043 llvm::ConstantArray::get(llvm::ArrayType::get(ObjCTypes.Int8PtrTy, 4044 NumClasses), 4045 Symbols); 4046 4047 llvm::GlobalVariable *GV = 4048 new llvm::GlobalVariable(Init->getType(), false, 4049 llvm::GlobalValue::InternalLinkage, 4050 Init, 4051 SymbolName, 4052 &CGM.getModule()); 4053 GV->setAlignment(8); 4054 GV->setSection(SectionName); 4055 UsedGlobals.push_back(GV); 4056} 4057 4058void CGObjCNonFragileABIMac::FinishNonFragileABIModule() { 4059 // nonfragile abi has no module definition. 4060 4061 // Build list of all implemented class addresses in array 4062 // L_OBJC_LABEL_CLASS_$. 4063 AddModuleClassList(DefinedClasses, 4064 "\01L_OBJC_LABEL_CLASS_$", 4065 "__DATA, __objc_classlist, regular, no_dead_strip"); 4066 AddModuleClassList(DefinedNonLazyClasses, 4067 "\01L_OBJC_LABEL_NONLAZY_CLASS_$", 4068 "__DATA, __objc_nlclslist, regular, no_dead_strip"); 4069 4070 // Build list of all implemented category addresses in array 4071 // L_OBJC_LABEL_CATEGORY_$. 4072 AddModuleClassList(DefinedCategories, 4073 "\01L_OBJC_LABEL_CATEGORY_$", 4074 "__DATA, __objc_catlist, regular, no_dead_strip"); 4075 AddModuleClassList(DefinedNonLazyCategories, 4076 "\01L_OBJC_LABEL_NONLAZY_CATEGORY_$", 4077 "__DATA, __objc_nlcatlist, regular, no_dead_strip"); 4078 4079 // static int L_OBJC_IMAGE_INFO[2] = { 0, flags }; 4080 // FIXME. flags can be 0 | 1 | 2 | 6. For now just use 0 4081 std::vector<llvm::Constant*> Values(2); 4082 Values[0] = llvm::ConstantInt::get(ObjCTypes.IntTy, 0); 4083 unsigned int flags = 0; 4084 // FIXME: Fix and continue? 4085 if (CGM.getLangOptions().getGCMode() != LangOptions::NonGC) 4086 flags |= eImageInfo_GarbageCollected; 4087 if (CGM.getLangOptions().getGCMode() == LangOptions::GCOnly) 4088 flags |= eImageInfo_GCOnly; 4089 Values[1] = llvm::ConstantInt::get(ObjCTypes.IntTy, flags); 4090 llvm::Constant* Init = llvm::ConstantArray::get( 4091 llvm::ArrayType::get(ObjCTypes.IntTy, 2), 4092 Values); 4093 llvm::GlobalVariable *IMGV = 4094 new llvm::GlobalVariable(Init->getType(), false, 4095 llvm::GlobalValue::InternalLinkage, 4096 Init, 4097 "\01L_OBJC_IMAGE_INFO", 4098 &CGM.getModule()); 4099 IMGV->setSection("__DATA, __objc_imageinfo, regular, no_dead_strip"); 4100 IMGV->setConstant(true); 4101 UsedGlobals.push_back(IMGV); 4102} 4103 4104/// LegacyDispatchedSelector - Returns true if SEL is not in the list of 4105/// NonLegacyDispatchMethods; false otherwise. What this means is that 4106/// except for the 19 selectors in the list, we generate 32bit-style 4107/// message dispatch call for all the rest. 4108/// 4109bool CGObjCNonFragileABIMac::LegacyDispatchedSelector(Selector Sel) { 4110 if (NonLegacyDispatchMethods.empty()) { 4111 NonLegacyDispatchMethods.insert(GetNullarySelector("alloc")); 4112 NonLegacyDispatchMethods.insert(GetNullarySelector("class")); 4113 NonLegacyDispatchMethods.insert(GetNullarySelector("self")); 4114 NonLegacyDispatchMethods.insert(GetNullarySelector("isFlipped")); 4115 NonLegacyDispatchMethods.insert(GetNullarySelector("length")); 4116 NonLegacyDispatchMethods.insert(GetNullarySelector("count")); 4117 NonLegacyDispatchMethods.insert(GetNullarySelector("retain")); 4118 NonLegacyDispatchMethods.insert(GetNullarySelector("release")); 4119 NonLegacyDispatchMethods.insert(GetNullarySelector("autorelease")); 4120 NonLegacyDispatchMethods.insert(GetNullarySelector("hash")); 4121 4122 NonLegacyDispatchMethods.insert(GetUnarySelector("allocWithZone")); 4123 NonLegacyDispatchMethods.insert(GetUnarySelector("isKindOfClass")); 4124 NonLegacyDispatchMethods.insert(GetUnarySelector("respondsToSelector")); 4125 NonLegacyDispatchMethods.insert(GetUnarySelector("objectForKey")); 4126 NonLegacyDispatchMethods.insert(GetUnarySelector("objectAtIndex")); 4127 NonLegacyDispatchMethods.insert(GetUnarySelector("isEqualToString")); 4128 NonLegacyDispatchMethods.insert(GetUnarySelector("isEqual")); 4129 NonLegacyDispatchMethods.insert(GetUnarySelector("addObject")); 4130 // "countByEnumeratingWithState:objects:count" 4131 IdentifierInfo *KeyIdents[] = { 4132 &CGM.getContext().Idents.get("countByEnumeratingWithState"), 4133 &CGM.getContext().Idents.get("objects"), 4134 &CGM.getContext().Idents.get("count") 4135 }; 4136 NonLegacyDispatchMethods.insert( 4137 CGM.getContext().Selectors.getSelector(3, KeyIdents)); 4138 } 4139 return (NonLegacyDispatchMethods.count(Sel) == 0); 4140} 4141 4142// Metadata flags 4143enum MetaDataDlags { 4144 CLS = 0x0, 4145 CLS_META = 0x1, 4146 CLS_ROOT = 0x2, 4147 OBJC2_CLS_HIDDEN = 0x10, 4148 CLS_EXCEPTION = 0x20 4149}; 4150/// BuildClassRoTInitializer - generate meta-data for: 4151/// struct _class_ro_t { 4152/// uint32_t const flags; 4153/// uint32_t const instanceStart; 4154/// uint32_t const instanceSize; 4155/// uint32_t const reserved; // only when building for 64bit targets 4156/// const uint8_t * const ivarLayout; 4157/// const char *const name; 4158/// const struct _method_list_t * const baseMethods; 4159/// const struct _protocol_list_t *const baseProtocols; 4160/// const struct _ivar_list_t *const ivars; 4161/// const uint8_t * const weakIvarLayout; 4162/// const struct _prop_list_t * const properties; 4163/// } 4164/// 4165llvm::GlobalVariable * CGObjCNonFragileABIMac::BuildClassRoTInitializer( 4166 unsigned flags, 4167 unsigned InstanceStart, 4168 unsigned InstanceSize, 4169 const ObjCImplementationDecl *ID) { 4170 std::string ClassName = ID->getNameAsString(); 4171 std::vector<llvm::Constant*> Values(10); // 11 for 64bit targets! 4172 Values[ 0] = llvm::ConstantInt::get(ObjCTypes.IntTy, flags); 4173 Values[ 1] = llvm::ConstantInt::get(ObjCTypes.IntTy, InstanceStart); 4174 Values[ 2] = llvm::ConstantInt::get(ObjCTypes.IntTy, InstanceSize); 4175 // FIXME. For 64bit targets add 0 here. 4176 Values[ 3] = (flags & CLS_META) ? GetIvarLayoutName(0, ObjCTypes) 4177 : BuildIvarLayout(ID, true); 4178 Values[ 4] = GetClassName(ID->getIdentifier()); 4179 // const struct _method_list_t * const baseMethods; 4180 std::vector<llvm::Constant*> Methods; 4181 std::string MethodListName("\01l_OBJC_$_"); 4182 if (flags & CLS_META) { 4183 MethodListName += "CLASS_METHODS_" + ID->getNameAsString(); 4184 for (ObjCImplementationDecl::classmeth_iterator 4185 i = ID->classmeth_begin(), e = ID->classmeth_end(); i != e; ++i) { 4186 // Class methods should always be defined. 4187 Methods.push_back(GetMethodConstant(*i)); 4188 } 4189 } else { 4190 MethodListName += "INSTANCE_METHODS_" + ID->getNameAsString(); 4191 for (ObjCImplementationDecl::instmeth_iterator 4192 i = ID->instmeth_begin(), e = ID->instmeth_end(); i != e; ++i) { 4193 // Instance methods should always be defined. 4194 Methods.push_back(GetMethodConstant(*i)); 4195 } 4196 for (ObjCImplementationDecl::propimpl_iterator 4197 i = ID->propimpl_begin(), e = ID->propimpl_end(); i != e; ++i) { 4198 ObjCPropertyImplDecl *PID = *i; 4199 4200 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize){ 4201 ObjCPropertyDecl *PD = PID->getPropertyDecl(); 4202 4203 if (ObjCMethodDecl *MD = PD->getGetterMethodDecl()) 4204 if (llvm::Constant *C = GetMethodConstant(MD)) 4205 Methods.push_back(C); 4206 if (ObjCMethodDecl *MD = PD->getSetterMethodDecl()) 4207 if (llvm::Constant *C = GetMethodConstant(MD)) 4208 Methods.push_back(C); 4209 } 4210 } 4211 } 4212 Values[ 5] = EmitMethodList(MethodListName, 4213 "__DATA, __objc_const", Methods); 4214 4215 const ObjCInterfaceDecl *OID = ID->getClassInterface(); 4216 assert(OID && "CGObjCNonFragileABIMac::BuildClassRoTInitializer"); 4217 Values[ 6] = EmitProtocolList("\01l_OBJC_CLASS_PROTOCOLS_$_" 4218 + OID->getNameAsString(), 4219 OID->protocol_begin(), 4220 OID->protocol_end()); 4221 4222 if (flags & CLS_META) 4223 Values[ 7] = llvm::Constant::getNullValue(ObjCTypes.IvarListnfABIPtrTy); 4224 else 4225 Values[ 7] = EmitIvarList(ID); 4226 Values[ 8] = (flags & CLS_META) ? GetIvarLayoutName(0, ObjCTypes) 4227 : BuildIvarLayout(ID, false); 4228 if (flags & CLS_META) 4229 Values[ 9] = llvm::Constant::getNullValue(ObjCTypes.PropertyListPtrTy); 4230 else 4231 Values[ 9] = 4232 EmitPropertyList( 4233 "\01l_OBJC_$_PROP_LIST_" + ID->getNameAsString(), 4234 ID, ID->getClassInterface(), ObjCTypes); 4235 llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.ClassRonfABITy, 4236 Values); 4237 llvm::GlobalVariable *CLASS_RO_GV = 4238 new llvm::GlobalVariable(ObjCTypes.ClassRonfABITy, false, 4239 llvm::GlobalValue::InternalLinkage, 4240 Init, 4241 (flags & CLS_META) ? 4242 std::string("\01l_OBJC_METACLASS_RO_$_")+ClassName : 4243 std::string("\01l_OBJC_CLASS_RO_$_")+ClassName, 4244 &CGM.getModule()); 4245 CLASS_RO_GV->setAlignment( 4246 CGM.getTargetData().getPrefTypeAlignment(ObjCTypes.ClassRonfABITy)); 4247 CLASS_RO_GV->setSection("__DATA, __objc_const"); 4248 return CLASS_RO_GV; 4249 4250} 4251 4252/// BuildClassMetaData - This routine defines that to-level meta-data 4253/// for the given ClassName for: 4254/// struct _class_t { 4255/// struct _class_t *isa; 4256/// struct _class_t * const superclass; 4257/// void *cache; 4258/// IMP *vtable; 4259/// struct class_ro_t *ro; 4260/// } 4261/// 4262llvm::GlobalVariable * CGObjCNonFragileABIMac::BuildClassMetaData( 4263 std::string &ClassName, 4264 llvm::Constant *IsAGV, 4265 llvm::Constant *SuperClassGV, 4266 llvm::Constant *ClassRoGV, 4267 bool HiddenVisibility) { 4268 std::vector<llvm::Constant*> Values(5); 4269 Values[0] = IsAGV; 4270 Values[1] = SuperClassGV 4271 ? SuperClassGV 4272 : llvm::Constant::getNullValue(ObjCTypes.ClassnfABIPtrTy); 4273 Values[2] = ObjCEmptyCacheVar; // &ObjCEmptyCacheVar 4274 Values[3] = ObjCEmptyVtableVar; // &ObjCEmptyVtableVar 4275 Values[4] = ClassRoGV; // &CLASS_RO_GV 4276 llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.ClassnfABITy, 4277 Values); 4278 llvm::GlobalVariable *GV = GetClassGlobal(ClassName); 4279 GV->setInitializer(Init); 4280 GV->setSection("__DATA, __objc_data"); 4281 GV->setAlignment( 4282 CGM.getTargetData().getPrefTypeAlignment(ObjCTypes.ClassnfABITy)); 4283 if (HiddenVisibility) 4284 GV->setVisibility(llvm::GlobalValue::HiddenVisibility); 4285 return GV; 4286} 4287 4288bool 4289CGObjCNonFragileABIMac::ImplementationIsNonLazy(const ObjCImplDecl *OD) const { 4290 return OD->getClassMethod(GetNullarySelector("load")) != 0; 4291} 4292 4293void CGObjCNonFragileABIMac::GetClassSizeInfo(const ObjCImplementationDecl *OID, 4294 uint32_t &InstanceStart, 4295 uint32_t &InstanceSize) { 4296 const ASTRecordLayout &RL = 4297 CGM.getContext().getASTObjCImplementationLayout(OID); 4298 4299 // InstanceSize is really instance end. 4300 InstanceSize = llvm::RoundUpToAlignment(RL.getNextOffset(), 8) / 8; 4301 4302 // If there are no fields, the start is the same as the end. 4303 if (!RL.getFieldCount()) 4304 InstanceStart = InstanceSize; 4305 else 4306 InstanceStart = RL.getFieldOffset(0) / 8; 4307} 4308 4309void CGObjCNonFragileABIMac::GenerateClass(const ObjCImplementationDecl *ID) { 4310 std::string ClassName = ID->getNameAsString(); 4311 if (!ObjCEmptyCacheVar) { 4312 ObjCEmptyCacheVar = new llvm::GlobalVariable( 4313 ObjCTypes.CacheTy, 4314 false, 4315 llvm::GlobalValue::ExternalLinkage, 4316 0, 4317 "_objc_empty_cache", 4318 &CGM.getModule()); 4319 4320 ObjCEmptyVtableVar = new llvm::GlobalVariable( 4321 ObjCTypes.ImpnfABITy, 4322 false, 4323 llvm::GlobalValue::ExternalLinkage, 4324 0, 4325 "_objc_empty_vtable", 4326 &CGM.getModule()); 4327 } 4328 assert(ID->getClassInterface() && 4329 "CGObjCNonFragileABIMac::GenerateClass - class is 0"); 4330 // FIXME: Is this correct (that meta class size is never computed)? 4331 uint32_t InstanceStart = 4332 CGM.getTargetData().getTypeAllocSize(ObjCTypes.ClassnfABITy); 4333 uint32_t InstanceSize = InstanceStart; 4334 uint32_t flags = CLS_META; 4335 std::string ObjCMetaClassName(getMetaclassSymbolPrefix()); 4336 std::string ObjCClassName(getClassSymbolPrefix()); 4337 4338 llvm::GlobalVariable *SuperClassGV, *IsAGV; 4339 4340 bool classIsHidden = 4341 CGM.getDeclVisibilityMode(ID->getClassInterface()) == LangOptions::Hidden; 4342 if (classIsHidden) 4343 flags |= OBJC2_CLS_HIDDEN; 4344 if (!ID->getClassInterface()->getSuperClass()) { 4345 // class is root 4346 flags |= CLS_ROOT; 4347 SuperClassGV = GetClassGlobal(ObjCClassName + ClassName); 4348 IsAGV = GetClassGlobal(ObjCMetaClassName + ClassName); 4349 } else { 4350 // Has a root. Current class is not a root. 4351 const ObjCInterfaceDecl *Root = ID->getClassInterface(); 4352 while (const ObjCInterfaceDecl *Super = Root->getSuperClass()) 4353 Root = Super; 4354 IsAGV = GetClassGlobal(ObjCMetaClassName + Root->getNameAsString()); 4355 // work on super class metadata symbol. 4356 std::string SuperClassName = 4357 ObjCMetaClassName + ID->getClassInterface()->getSuperClass()->getNameAsString(); 4358 SuperClassGV = GetClassGlobal(SuperClassName); 4359 } 4360 llvm::GlobalVariable *CLASS_RO_GV = BuildClassRoTInitializer(flags, 4361 InstanceStart, 4362 InstanceSize,ID); 4363 std::string TClassName = ObjCMetaClassName + ClassName; 4364 llvm::GlobalVariable *MetaTClass = 4365 BuildClassMetaData(TClassName, IsAGV, SuperClassGV, CLASS_RO_GV, 4366 classIsHidden); 4367 4368 // Metadata for the class 4369 flags = CLS; 4370 if (classIsHidden) 4371 flags |= OBJC2_CLS_HIDDEN; 4372 4373 if (hasObjCExceptionAttribute(CGM.getContext(), ID->getClassInterface())) 4374 flags |= CLS_EXCEPTION; 4375 4376 if (!ID->getClassInterface()->getSuperClass()) { 4377 flags |= CLS_ROOT; 4378 SuperClassGV = 0; 4379 } else { 4380 // Has a root. Current class is not a root. 4381 std::string RootClassName = 4382 ID->getClassInterface()->getSuperClass()->getNameAsString(); 4383 SuperClassGV = GetClassGlobal(ObjCClassName + RootClassName); 4384 } 4385 GetClassSizeInfo(ID, InstanceStart, InstanceSize); 4386 CLASS_RO_GV = BuildClassRoTInitializer(flags, 4387 InstanceStart, 4388 InstanceSize, 4389 ID); 4390 4391 TClassName = ObjCClassName + ClassName; 4392 llvm::GlobalVariable *ClassMD = 4393 BuildClassMetaData(TClassName, MetaTClass, SuperClassGV, CLASS_RO_GV, 4394 classIsHidden); 4395 DefinedClasses.push_back(ClassMD); 4396 4397 // Determine if this class is also "non-lazy". 4398 if (ImplementationIsNonLazy(ID)) 4399 DefinedNonLazyClasses.push_back(ClassMD); 4400 4401 // Force the definition of the EHType if necessary. 4402 if (flags & CLS_EXCEPTION) 4403 GetInterfaceEHType(ID->getClassInterface(), true); 4404} 4405 4406/// GenerateProtocolRef - This routine is called to generate code for 4407/// a protocol reference expression; as in: 4408/// @code 4409/// @protocol(Proto1); 4410/// @endcode 4411/// It generates a weak reference to l_OBJC_PROTOCOL_REFERENCE_$_Proto1 4412/// which will hold address of the protocol meta-data. 4413/// 4414llvm::Value *CGObjCNonFragileABIMac::GenerateProtocolRef(CGBuilderTy &Builder, 4415 const ObjCProtocolDecl *PD) { 4416 4417 // This routine is called for @protocol only. So, we must build definition 4418 // of protocol's meta-data (not a reference to it!) 4419 // 4420 llvm::Constant *Init = llvm::ConstantExpr::getBitCast(GetOrEmitProtocol(PD), 4421 ObjCTypes.ExternalProtocolPtrTy); 4422 4423 std::string ProtocolName("\01l_OBJC_PROTOCOL_REFERENCE_$_"); 4424 ProtocolName += PD->getNameAsCString(); 4425 4426 llvm::GlobalVariable *PTGV = CGM.getModule().getGlobalVariable(ProtocolName); 4427 if (PTGV) 4428 return Builder.CreateLoad(PTGV, false, "tmp"); 4429 PTGV = new llvm::GlobalVariable( 4430 Init->getType(), false, 4431 llvm::GlobalValue::WeakAnyLinkage, 4432 Init, 4433 ProtocolName, 4434 &CGM.getModule()); 4435 PTGV->setSection("__DATA, __objc_protorefs, coalesced, no_dead_strip"); 4436 PTGV->setVisibility(llvm::GlobalValue::HiddenVisibility); 4437 UsedGlobals.push_back(PTGV); 4438 return Builder.CreateLoad(PTGV, false, "tmp"); 4439} 4440 4441/// GenerateCategory - Build metadata for a category implementation. 4442/// struct _category_t { 4443/// const char * const name; 4444/// struct _class_t *const cls; 4445/// const struct _method_list_t * const instance_methods; 4446/// const struct _method_list_t * const class_methods; 4447/// const struct _protocol_list_t * const protocols; 4448/// const struct _prop_list_t * const properties; 4449/// } 4450/// 4451void CGObjCNonFragileABIMac::GenerateCategory(const ObjCCategoryImplDecl *OCD) { 4452 const ObjCInterfaceDecl *Interface = OCD->getClassInterface(); 4453 const char *Prefix = "\01l_OBJC_$_CATEGORY_"; 4454 std::string ExtCatName(Prefix + Interface->getNameAsString()+ 4455 "_$_" + OCD->getNameAsString()); 4456 std::string ExtClassName(getClassSymbolPrefix() + 4457 Interface->getNameAsString()); 4458 4459 std::vector<llvm::Constant*> Values(6); 4460 Values[0] = GetClassName(OCD->getIdentifier()); 4461 // meta-class entry symbol 4462 llvm::GlobalVariable *ClassGV = GetClassGlobal(ExtClassName); 4463 Values[1] = ClassGV; 4464 std::vector<llvm::Constant*> Methods; 4465 std::string MethodListName(Prefix); 4466 MethodListName += "INSTANCE_METHODS_" + Interface->getNameAsString() + 4467 "_$_" + OCD->getNameAsString(); 4468 4469 for (ObjCCategoryImplDecl::instmeth_iterator 4470 i = OCD->instmeth_begin(), e = OCD->instmeth_end(); i != e; ++i) { 4471 // Instance methods should always be defined. 4472 Methods.push_back(GetMethodConstant(*i)); 4473 } 4474 4475 Values[2] = EmitMethodList(MethodListName, 4476 "__DATA, __objc_const", 4477 Methods); 4478 4479 MethodListName = Prefix; 4480 MethodListName += "CLASS_METHODS_" + Interface->getNameAsString() + "_$_" + 4481 OCD->getNameAsString(); 4482 Methods.clear(); 4483 for (ObjCCategoryImplDecl::classmeth_iterator 4484 i = OCD->classmeth_begin(), e = OCD->classmeth_end(); i != e; ++i) { 4485 // Class methods should always be defined. 4486 Methods.push_back(GetMethodConstant(*i)); 4487 } 4488 4489 Values[3] = EmitMethodList(MethodListName, 4490 "__DATA, __objc_const", 4491 Methods); 4492 const ObjCCategoryDecl *Category = 4493 Interface->FindCategoryDeclaration(OCD->getIdentifier()); 4494 if (Category) { 4495 std::string ExtName(Interface->getNameAsString() + "_$_" + 4496 OCD->getNameAsString()); 4497 Values[4] = EmitProtocolList("\01l_OBJC_CATEGORY_PROTOCOLS_$_" 4498 + Interface->getNameAsString() + "_$_" 4499 + Category->getNameAsString(), 4500 Category->protocol_begin(), 4501 Category->protocol_end()); 4502 Values[5] = 4503 EmitPropertyList(std::string("\01l_OBJC_$_PROP_LIST_") + ExtName, 4504 OCD, Category, ObjCTypes); 4505 } 4506 else { 4507 Values[4] = llvm::Constant::getNullValue(ObjCTypes.ProtocolListnfABIPtrTy); 4508 Values[5] = llvm::Constant::getNullValue(ObjCTypes.PropertyListPtrTy); 4509 } 4510 4511 llvm::Constant *Init = 4512 llvm::ConstantStruct::get(ObjCTypes.CategorynfABITy, 4513 Values); 4514 llvm::GlobalVariable *GCATV 4515 = new llvm::GlobalVariable(ObjCTypes.CategorynfABITy, 4516 false, 4517 llvm::GlobalValue::InternalLinkage, 4518 Init, 4519 ExtCatName, 4520 &CGM.getModule()); 4521 GCATV->setAlignment( 4522 CGM.getTargetData().getPrefTypeAlignment(ObjCTypes.CategorynfABITy)); 4523 GCATV->setSection("__DATA, __objc_const"); 4524 UsedGlobals.push_back(GCATV); 4525 DefinedCategories.push_back(GCATV); 4526 4527 // Determine if this category is also "non-lazy". 4528 if (ImplementationIsNonLazy(OCD)) 4529 DefinedNonLazyCategories.push_back(GCATV); 4530} 4531 4532/// GetMethodConstant - Return a struct objc_method constant for the 4533/// given method if it has been defined. The result is null if the 4534/// method has not been defined. The return value has type MethodPtrTy. 4535llvm::Constant *CGObjCNonFragileABIMac::GetMethodConstant( 4536 const ObjCMethodDecl *MD) { 4537 // FIXME: Use DenseMap::lookup 4538 llvm::Function *Fn = MethodDefinitions[MD]; 4539 if (!Fn) 4540 return 0; 4541 4542 std::vector<llvm::Constant*> Method(3); 4543 Method[0] = 4544 llvm::ConstantExpr::getBitCast(GetMethodVarName(MD->getSelector()), 4545 ObjCTypes.SelectorPtrTy); 4546 Method[1] = GetMethodVarType(MD); 4547 Method[2] = llvm::ConstantExpr::getBitCast(Fn, ObjCTypes.Int8PtrTy); 4548 return llvm::ConstantStruct::get(ObjCTypes.MethodTy, Method); 4549} 4550 4551/// EmitMethodList - Build meta-data for method declarations 4552/// struct _method_list_t { 4553/// uint32_t entsize; // sizeof(struct _objc_method) 4554/// uint32_t method_count; 4555/// struct _objc_method method_list[method_count]; 4556/// } 4557/// 4558llvm::Constant *CGObjCNonFragileABIMac::EmitMethodList( 4559 const std::string &Name, 4560 const char *Section, 4561 const ConstantVector &Methods) { 4562 // Return null for empty list. 4563 if (Methods.empty()) 4564 return llvm::Constant::getNullValue(ObjCTypes.MethodListnfABIPtrTy); 4565 4566 std::vector<llvm::Constant*> Values(3); 4567 // sizeof(struct _objc_method) 4568 unsigned Size = CGM.getTargetData().getTypeAllocSize(ObjCTypes.MethodTy); 4569 Values[0] = llvm::ConstantInt::get(ObjCTypes.IntTy, Size); 4570 // method_count 4571 Values[1] = llvm::ConstantInt::get(ObjCTypes.IntTy, Methods.size()); 4572 llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.MethodTy, 4573 Methods.size()); 4574 Values[2] = llvm::ConstantArray::get(AT, Methods); 4575 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 4576 4577 llvm::GlobalVariable *GV = 4578 new llvm::GlobalVariable(Init->getType(), false, 4579 llvm::GlobalValue::InternalLinkage, 4580 Init, 4581 Name, 4582 &CGM.getModule()); 4583 GV->setAlignment( 4584 CGM.getTargetData().getPrefTypeAlignment(Init->getType())); 4585 GV->setSection(Section); 4586 UsedGlobals.push_back(GV); 4587 return llvm::ConstantExpr::getBitCast(GV, 4588 ObjCTypes.MethodListnfABIPtrTy); 4589} 4590 4591/// ObjCIvarOffsetVariable - Returns the ivar offset variable for 4592/// the given ivar. 4593llvm::GlobalVariable * CGObjCNonFragileABIMac::ObjCIvarOffsetVariable( 4594 const ObjCInterfaceDecl *ID, 4595 const ObjCIvarDecl *Ivar) { 4596 // FIXME: We shouldn't need to do this lookup. 4597 unsigned Index; 4598 const ObjCInterfaceDecl *Container = 4599 FindIvarInterface(CGM.getContext(), ID, Ivar, Index); 4600 assert(Container && "Unable to find ivar container!"); 4601 std::string Name = "OBJC_IVAR_$_" + Container->getNameAsString() + 4602 '.' + Ivar->getNameAsString(); 4603 llvm::GlobalVariable *IvarOffsetGV = 4604 CGM.getModule().getGlobalVariable(Name); 4605 if (!IvarOffsetGV) 4606 IvarOffsetGV = 4607 new llvm::GlobalVariable(ObjCTypes.LongTy, 4608 false, 4609 llvm::GlobalValue::ExternalLinkage, 4610 0, 4611 Name, 4612 &CGM.getModule()); 4613 return IvarOffsetGV; 4614} 4615 4616llvm::Constant * CGObjCNonFragileABIMac::EmitIvarOffsetVar( 4617 const ObjCInterfaceDecl *ID, 4618 const ObjCIvarDecl *Ivar, 4619 unsigned long int Offset) { 4620 llvm::GlobalVariable *IvarOffsetGV = ObjCIvarOffsetVariable(ID, Ivar); 4621 IvarOffsetGV->setInitializer(llvm::ConstantInt::get(ObjCTypes.LongTy, 4622 Offset)); 4623 IvarOffsetGV->setAlignment( 4624 CGM.getTargetData().getPrefTypeAlignment(ObjCTypes.LongTy)); 4625 4626 // FIXME: This matches gcc, but shouldn't the visibility be set on the use as 4627 // well (i.e., in ObjCIvarOffsetVariable). 4628 if (Ivar->getAccessControl() == ObjCIvarDecl::Private || 4629 Ivar->getAccessControl() == ObjCIvarDecl::Package || 4630 CGM.getDeclVisibilityMode(ID) == LangOptions::Hidden) 4631 IvarOffsetGV->setVisibility(llvm::GlobalValue::HiddenVisibility); 4632 else 4633 IvarOffsetGV->setVisibility(llvm::GlobalValue::DefaultVisibility); 4634 IvarOffsetGV->setSection("__DATA, __objc_const"); 4635 return IvarOffsetGV; 4636} 4637 4638/// EmitIvarList - Emit the ivar list for the given 4639/// implementation. The return value has type 4640/// IvarListnfABIPtrTy. 4641/// struct _ivar_t { 4642/// unsigned long int *offset; // pointer to ivar offset location 4643/// char *name; 4644/// char *type; 4645/// uint32_t alignment; 4646/// uint32_t size; 4647/// } 4648/// struct _ivar_list_t { 4649/// uint32 entsize; // sizeof(struct _ivar_t) 4650/// uint32 count; 4651/// struct _iver_t list[count]; 4652/// } 4653/// 4654 4655llvm::Constant *CGObjCNonFragileABIMac::EmitIvarList( 4656 const ObjCImplementationDecl *ID) { 4657 4658 std::vector<llvm::Constant*> Ivars, Ivar(5); 4659 4660 const ObjCInterfaceDecl *OID = ID->getClassInterface(); 4661 assert(OID && "CGObjCNonFragileABIMac::EmitIvarList - null interface"); 4662 4663 // FIXME. Consolidate this with similar code in GenerateClass. 4664 4665 // Collect declared and synthesized ivars in a small vector. 4666 llvm::SmallVector<ObjCIvarDecl*, 16> OIvars; 4667 CGM.getContext().ShallowCollectObjCIvars(OID, OIvars); 4668 4669 for (unsigned i = 0, e = OIvars.size(); i != e; ++i) { 4670 ObjCIvarDecl *IVD = OIvars[i]; 4671 // Ignore unnamed bit-fields. 4672 if (!IVD->getDeclName()) 4673 continue; 4674 Ivar[0] = EmitIvarOffsetVar(ID->getClassInterface(), IVD, 4675 ComputeIvarBaseOffset(CGM, ID, IVD)); 4676 Ivar[1] = GetMethodVarName(IVD->getIdentifier()); 4677 Ivar[2] = GetMethodVarType(IVD); 4678 const llvm::Type *FieldTy = 4679 CGM.getTypes().ConvertTypeForMem(IVD->getType()); 4680 unsigned Size = CGM.getTargetData().getTypeAllocSize(FieldTy); 4681 unsigned Align = CGM.getContext().getPreferredTypeAlign( 4682 IVD->getType().getTypePtr()) >> 3; 4683 Align = llvm::Log2_32(Align); 4684 Ivar[3] = llvm::ConstantInt::get(ObjCTypes.IntTy, Align); 4685 // NOTE. Size of a bitfield does not match gcc's, because of the 4686 // way bitfields are treated special in each. But I am told that 4687 // 'size' for bitfield ivars is ignored by the runtime so it does 4688 // not matter. If it matters, there is enough info to get the 4689 // bitfield right! 4690 Ivar[4] = llvm::ConstantInt::get(ObjCTypes.IntTy, Size); 4691 Ivars.push_back(llvm::ConstantStruct::get(ObjCTypes.IvarnfABITy, Ivar)); 4692 } 4693 // Return null for empty list. 4694 if (Ivars.empty()) 4695 return llvm::Constant::getNullValue(ObjCTypes.IvarListnfABIPtrTy); 4696 std::vector<llvm::Constant*> Values(3); 4697 unsigned Size = CGM.getTargetData().getTypeAllocSize(ObjCTypes.IvarnfABITy); 4698 Values[0] = llvm::ConstantInt::get(ObjCTypes.IntTy, Size); 4699 Values[1] = llvm::ConstantInt::get(ObjCTypes.IntTy, Ivars.size()); 4700 llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.IvarnfABITy, 4701 Ivars.size()); 4702 Values[2] = llvm::ConstantArray::get(AT, Ivars); 4703 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 4704 const char *Prefix = "\01l_OBJC_$_INSTANCE_VARIABLES_"; 4705 llvm::GlobalVariable *GV = 4706 new llvm::GlobalVariable(Init->getType(), false, 4707 llvm::GlobalValue::InternalLinkage, 4708 Init, 4709 Prefix + OID->getNameAsString(), 4710 &CGM.getModule()); 4711 GV->setAlignment( 4712 CGM.getTargetData().getPrefTypeAlignment(Init->getType())); 4713 GV->setSection("__DATA, __objc_const"); 4714 4715 UsedGlobals.push_back(GV); 4716 return llvm::ConstantExpr::getBitCast(GV, 4717 ObjCTypes.IvarListnfABIPtrTy); 4718} 4719 4720llvm::Constant *CGObjCNonFragileABIMac::GetOrEmitProtocolRef( 4721 const ObjCProtocolDecl *PD) { 4722 llvm::GlobalVariable *&Entry = Protocols[PD->getIdentifier()]; 4723 4724 if (!Entry) { 4725 // We use the initializer as a marker of whether this is a forward 4726 // reference or not. At module finalization we add the empty 4727 // contents for protocols which were referenced but never defined. 4728 Entry = 4729 new llvm::GlobalVariable(ObjCTypes.ProtocolnfABITy, false, 4730 llvm::GlobalValue::ExternalLinkage, 4731 0, 4732 "\01l_OBJC_PROTOCOL_$_" + PD->getNameAsString(), 4733 &CGM.getModule()); 4734 Entry->setSection("__DATA,__datacoal_nt,coalesced"); 4735 UsedGlobals.push_back(Entry); 4736 } 4737 4738 return Entry; 4739} 4740 4741/// GetOrEmitProtocol - Generate the protocol meta-data: 4742/// @code 4743/// struct _protocol_t { 4744/// id isa; // NULL 4745/// const char * const protocol_name; 4746/// const struct _protocol_list_t * protocol_list; // super protocols 4747/// const struct method_list_t * const instance_methods; 4748/// const struct method_list_t * const class_methods; 4749/// const struct method_list_t *optionalInstanceMethods; 4750/// const struct method_list_t *optionalClassMethods; 4751/// const struct _prop_list_t * properties; 4752/// const uint32_t size; // sizeof(struct _protocol_t) 4753/// const uint32_t flags; // = 0 4754/// } 4755/// @endcode 4756/// 4757 4758llvm::Constant *CGObjCNonFragileABIMac::GetOrEmitProtocol( 4759 const ObjCProtocolDecl *PD) { 4760 llvm::GlobalVariable *&Entry = Protocols[PD->getIdentifier()]; 4761 4762 // Early exit if a defining object has already been generated. 4763 if (Entry && Entry->hasInitializer()) 4764 return Entry; 4765 4766 const char *ProtocolName = PD->getNameAsCString(); 4767 4768 // Construct method lists. 4769 std::vector<llvm::Constant*> InstanceMethods, ClassMethods; 4770 std::vector<llvm::Constant*> OptInstanceMethods, OptClassMethods; 4771 for (ObjCProtocolDecl::instmeth_iterator 4772 i = PD->instmeth_begin(), e = PD->instmeth_end(); i != e; ++i) { 4773 ObjCMethodDecl *MD = *i; 4774 llvm::Constant *C = GetMethodDescriptionConstant(MD); 4775 if (MD->getImplementationControl() == ObjCMethodDecl::Optional) { 4776 OptInstanceMethods.push_back(C); 4777 } else { 4778 InstanceMethods.push_back(C); 4779 } 4780 } 4781 4782 for (ObjCProtocolDecl::classmeth_iterator 4783 i = PD->classmeth_begin(), e = PD->classmeth_end(); i != e; ++i) { 4784 ObjCMethodDecl *MD = *i; 4785 llvm::Constant *C = GetMethodDescriptionConstant(MD); 4786 if (MD->getImplementationControl() == ObjCMethodDecl::Optional) { 4787 OptClassMethods.push_back(C); 4788 } else { 4789 ClassMethods.push_back(C); 4790 } 4791 } 4792 4793 std::vector<llvm::Constant*> Values(10); 4794 // isa is NULL 4795 Values[0] = llvm::Constant::getNullValue(ObjCTypes.ObjectPtrTy); 4796 Values[1] = GetClassName(PD->getIdentifier()); 4797 Values[2] = EmitProtocolList( 4798 "\01l_OBJC_$_PROTOCOL_REFS_" + PD->getNameAsString(), 4799 PD->protocol_begin(), 4800 PD->protocol_end()); 4801 4802 Values[3] = EmitMethodList("\01l_OBJC_$_PROTOCOL_INSTANCE_METHODS_" 4803 + PD->getNameAsString(), 4804 "__DATA, __objc_const", 4805 InstanceMethods); 4806 Values[4] = EmitMethodList("\01l_OBJC_$_PROTOCOL_CLASS_METHODS_" 4807 + PD->getNameAsString(), 4808 "__DATA, __objc_const", 4809 ClassMethods); 4810 Values[5] = EmitMethodList("\01l_OBJC_$_PROTOCOL_INSTANCE_METHODS_OPT_" 4811 + PD->getNameAsString(), 4812 "__DATA, __objc_const", 4813 OptInstanceMethods); 4814 Values[6] = EmitMethodList("\01l_OBJC_$_PROTOCOL_CLASS_METHODS_OPT_" 4815 + PD->getNameAsString(), 4816 "__DATA, __objc_const", 4817 OptClassMethods); 4818 Values[7] = EmitPropertyList("\01l_OBJC_$_PROP_LIST_" + PD->getNameAsString(), 4819 0, PD, ObjCTypes); 4820 uint32_t Size = 4821 CGM.getTargetData().getTypeAllocSize(ObjCTypes.ProtocolnfABITy); 4822 Values[8] = llvm::ConstantInt::get(ObjCTypes.IntTy, Size); 4823 Values[9] = llvm::Constant::getNullValue(ObjCTypes.IntTy); 4824 llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.ProtocolnfABITy, 4825 Values); 4826 4827 if (Entry) { 4828 // Already created, fix the linkage and update the initializer. 4829 Entry->setLinkage(llvm::GlobalValue::WeakAnyLinkage); 4830 Entry->setInitializer(Init); 4831 } else { 4832 Entry = 4833 new llvm::GlobalVariable(ObjCTypes.ProtocolnfABITy, false, 4834 llvm::GlobalValue::WeakAnyLinkage, 4835 Init, 4836 std::string("\01l_OBJC_PROTOCOL_$_")+ProtocolName, 4837 &CGM.getModule()); 4838 Entry->setAlignment( 4839 CGM.getTargetData().getPrefTypeAlignment(ObjCTypes.ProtocolnfABITy)); 4840 Entry->setSection("__DATA,__datacoal_nt,coalesced"); 4841 } 4842 Entry->setVisibility(llvm::GlobalValue::HiddenVisibility); 4843 4844 // Use this protocol meta-data to build protocol list table in section 4845 // __DATA, __objc_protolist 4846 llvm::GlobalVariable *PTGV = new llvm::GlobalVariable( 4847 ObjCTypes.ProtocolnfABIPtrTy, false, 4848 llvm::GlobalValue::WeakAnyLinkage, 4849 Entry, 4850 std::string("\01l_OBJC_LABEL_PROTOCOL_$_") 4851 +ProtocolName, 4852 &CGM.getModule()); 4853 PTGV->setAlignment( 4854 CGM.getTargetData().getPrefTypeAlignment(ObjCTypes.ProtocolnfABIPtrTy)); 4855 PTGV->setSection("__DATA, __objc_protolist, coalesced, no_dead_strip"); 4856 PTGV->setVisibility(llvm::GlobalValue::HiddenVisibility); 4857 UsedGlobals.push_back(PTGV); 4858 return Entry; 4859} 4860 4861/// EmitProtocolList - Generate protocol list meta-data: 4862/// @code 4863/// struct _protocol_list_t { 4864/// long protocol_count; // Note, this is 32/64 bit 4865/// struct _protocol_t[protocol_count]; 4866/// } 4867/// @endcode 4868/// 4869llvm::Constant * 4870CGObjCNonFragileABIMac::EmitProtocolList(const std::string &Name, 4871 ObjCProtocolDecl::protocol_iterator begin, 4872 ObjCProtocolDecl::protocol_iterator end) { 4873 std::vector<llvm::Constant*> ProtocolRefs; 4874 4875 // Just return null for empty protocol lists 4876 if (begin == end) 4877 return llvm::Constant::getNullValue(ObjCTypes.ProtocolListnfABIPtrTy); 4878 4879 // FIXME: We shouldn't need to do this lookup here, should we? 4880 llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name, true); 4881 if (GV) 4882 return llvm::ConstantExpr::getBitCast(GV, 4883 ObjCTypes.ProtocolListnfABIPtrTy); 4884 4885 for (; begin != end; ++begin) 4886 ProtocolRefs.push_back(GetProtocolRef(*begin)); // Implemented??? 4887 4888 // This list is null terminated. 4889 ProtocolRefs.push_back(llvm::Constant::getNullValue( 4890 ObjCTypes.ProtocolnfABIPtrTy)); 4891 4892 std::vector<llvm::Constant*> Values(2); 4893 Values[0] = llvm::ConstantInt::get(ObjCTypes.LongTy, ProtocolRefs.size() - 1); 4894 Values[1] = 4895 llvm::ConstantArray::get(llvm::ArrayType::get(ObjCTypes.ProtocolnfABIPtrTy, 4896 ProtocolRefs.size()), 4897 ProtocolRefs); 4898 4899 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 4900 GV = new llvm::GlobalVariable(Init->getType(), false, 4901 llvm::GlobalValue::InternalLinkage, 4902 Init, 4903 Name, 4904 &CGM.getModule()); 4905 GV->setSection("__DATA, __objc_const"); 4906 GV->setAlignment( 4907 CGM.getTargetData().getPrefTypeAlignment(Init->getType())); 4908 UsedGlobals.push_back(GV); 4909 return llvm::ConstantExpr::getBitCast(GV, 4910 ObjCTypes.ProtocolListnfABIPtrTy); 4911} 4912 4913/// GetMethodDescriptionConstant - This routine build following meta-data: 4914/// struct _objc_method { 4915/// SEL _cmd; 4916/// char *method_type; 4917/// char *_imp; 4918/// } 4919 4920llvm::Constant * 4921CGObjCNonFragileABIMac::GetMethodDescriptionConstant(const ObjCMethodDecl *MD) { 4922 std::vector<llvm::Constant*> Desc(3); 4923 Desc[0] = llvm::ConstantExpr::getBitCast(GetMethodVarName(MD->getSelector()), 4924 ObjCTypes.SelectorPtrTy); 4925 Desc[1] = GetMethodVarType(MD); 4926 // Protocol methods have no implementation. So, this entry is always NULL. 4927 Desc[2] = llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy); 4928 return llvm::ConstantStruct::get(ObjCTypes.MethodTy, Desc); 4929} 4930 4931/// EmitObjCValueForIvar - Code Gen for nonfragile ivar reference. 4932/// This code gen. amounts to generating code for: 4933/// @code 4934/// (type *)((char *)base + _OBJC_IVAR_$_.ivar; 4935/// @encode 4936/// 4937LValue CGObjCNonFragileABIMac::EmitObjCValueForIvar( 4938 CodeGen::CodeGenFunction &CGF, 4939 QualType ObjectTy, 4940 llvm::Value *BaseValue, 4941 const ObjCIvarDecl *Ivar, 4942 unsigned CVRQualifiers) { 4943 const ObjCInterfaceDecl *ID = ObjectTy->getAsObjCInterfaceType()->getDecl(); 4944 return EmitValueForIvarAtOffset(CGF, ID, BaseValue, Ivar, CVRQualifiers, 4945 EmitIvarOffset(CGF, ID, Ivar)); 4946} 4947 4948llvm::Value *CGObjCNonFragileABIMac::EmitIvarOffset( 4949 CodeGen::CodeGenFunction &CGF, 4950 const ObjCInterfaceDecl *Interface, 4951 const ObjCIvarDecl *Ivar) { 4952 return CGF.Builder.CreateLoad(ObjCIvarOffsetVariable(Interface, Ivar), 4953 false, "ivar"); 4954} 4955 4956CodeGen::RValue CGObjCNonFragileABIMac::EmitMessageSend( 4957 CodeGen::CodeGenFunction &CGF, 4958 QualType ResultType, 4959 Selector Sel, 4960 llvm::Value *Receiver, 4961 QualType Arg0Ty, 4962 bool IsSuper, 4963 const CallArgList &CallArgs) { 4964 // FIXME. Even though IsSuper is passes. This function doese not handle calls 4965 // to 'super' receivers. 4966 CodeGenTypes &Types = CGM.getTypes(); 4967 llvm::Value *Arg0 = Receiver; 4968 if (!IsSuper) 4969 Arg0 = CGF.Builder.CreateBitCast(Arg0, ObjCTypes.ObjectPtrTy, "tmp"); 4970 4971 // Find the message function name. 4972 // FIXME. This is too much work to get the ABI-specific result type needed to 4973 // find the message name. 4974 const CGFunctionInfo &FnInfo = Types.getFunctionInfo(ResultType, 4975 llvm::SmallVector<QualType, 16>()); 4976 llvm::Constant *Fn = 0; 4977 std::string Name("\01l_"); 4978 if (CGM.ReturnTypeUsesSret(FnInfo)) { 4979#if 0 4980 // unlike what is documented. gcc never generates this API!! 4981 if (Receiver->getType() == ObjCTypes.ObjectPtrTy) { 4982 Fn = ObjCTypes.getMessageSendIdStretFixupFn(); 4983 // FIXME. Is there a better way of getting these names. 4984 // They are available in RuntimeFunctions vector pair. 4985 Name += "objc_msgSendId_stret_fixup"; 4986 } 4987 else 4988#endif 4989 if (IsSuper) { 4990 Fn = ObjCTypes.getMessageSendSuper2StretFixupFn(); 4991 Name += "objc_msgSendSuper2_stret_fixup"; 4992 } 4993 else 4994 { 4995 Fn = ObjCTypes.getMessageSendStretFixupFn(); 4996 Name += "objc_msgSend_stret_fixup"; 4997 } 4998 } 4999 else if (!IsSuper && ResultType->isFloatingType()) { 5000 if (ResultType->isSpecificBuiltinType(BuiltinType::LongDouble)) { 5001 Fn = ObjCTypes.getMessageSendFpretFixupFn(); 5002 Name += "objc_msgSend_fpret_fixup"; 5003 } 5004 else { 5005 Fn = ObjCTypes.getMessageSendFixupFn(); 5006 Name += "objc_msgSend_fixup"; 5007 } 5008 } 5009 else { 5010#if 0 5011// unlike what is documented. gcc never generates this API!! 5012 if (Receiver->getType() == ObjCTypes.ObjectPtrTy) { 5013 Fn = ObjCTypes.getMessageSendIdFixupFn(); 5014 Name += "objc_msgSendId_fixup"; 5015 } 5016 else 5017#endif 5018 if (IsSuper) { 5019 Fn = ObjCTypes.getMessageSendSuper2FixupFn(); 5020 Name += "objc_msgSendSuper2_fixup"; 5021 } 5022 else 5023 { 5024 Fn = ObjCTypes.getMessageSendFixupFn(); 5025 Name += "objc_msgSend_fixup"; 5026 } 5027 } 5028 assert(Fn && "CGObjCNonFragileABIMac::EmitMessageSend"); 5029 Name += '_'; 5030 std::string SelName(Sel.getAsString()); 5031 // Replace all ':' in selector name with '_' ouch! 5032 for(unsigned i = 0; i < SelName.size(); i++) 5033 if (SelName[i] == ':') 5034 SelName[i] = '_'; 5035 Name += SelName; 5036 llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name); 5037 if (!GV) { 5038 // Build message ref table entry. 5039 std::vector<llvm::Constant*> Values(2); 5040 Values[0] = Fn; 5041 Values[1] = GetMethodVarName(Sel); 5042 llvm::Constant *Init = llvm::ConstantStruct::get(Values); 5043 GV = new llvm::GlobalVariable(Init->getType(), false, 5044 llvm::GlobalValue::WeakAnyLinkage, 5045 Init, 5046 Name, 5047 &CGM.getModule()); 5048 GV->setVisibility(llvm::GlobalValue::HiddenVisibility); 5049 GV->setAlignment(16); 5050 GV->setSection("__DATA, __objc_msgrefs, coalesced"); 5051 } 5052 llvm::Value *Arg1 = CGF.Builder.CreateBitCast(GV, ObjCTypes.MessageRefPtrTy); 5053 5054 CallArgList ActualArgs; 5055 ActualArgs.push_back(std::make_pair(RValue::get(Arg0), Arg0Ty)); 5056 ActualArgs.push_back(std::make_pair(RValue::get(Arg1), 5057 ObjCTypes.MessageRefCPtrTy)); 5058 ActualArgs.insert(ActualArgs.end(), CallArgs.begin(), CallArgs.end()); 5059 const CGFunctionInfo &FnInfo1 = Types.getFunctionInfo(ResultType, ActualArgs); 5060 llvm::Value *Callee = CGF.Builder.CreateStructGEP(Arg1, 0); 5061 Callee = CGF.Builder.CreateLoad(Callee); 5062 const llvm::FunctionType *FTy = Types.GetFunctionType(FnInfo1, true); 5063 Callee = CGF.Builder.CreateBitCast(Callee, 5064 llvm::PointerType::getUnqual(FTy)); 5065 return CGF.EmitCall(FnInfo1, Callee, ActualArgs); 5066} 5067 5068/// Generate code for a message send expression in the nonfragile abi. 5069CodeGen::RValue CGObjCNonFragileABIMac::GenerateMessageSend( 5070 CodeGen::CodeGenFunction &CGF, 5071 QualType ResultType, 5072 Selector Sel, 5073 llvm::Value *Receiver, 5074 bool IsClassMessage, 5075 const CallArgList &CallArgs, 5076 const ObjCMethodDecl *Method) { 5077 return LegacyDispatchedSelector(Sel) 5078 ? EmitLegacyMessageSend(CGF, ResultType, EmitSelector(CGF.Builder, Sel), 5079 Receiver, CGF.getContext().getObjCIdType(), 5080 false, CallArgs, ObjCTypes) 5081 : EmitMessageSend(CGF, ResultType, Sel, 5082 Receiver, CGF.getContext().getObjCIdType(), 5083 false, CallArgs); 5084} 5085 5086llvm::GlobalVariable * 5087CGObjCNonFragileABIMac::GetClassGlobal(const std::string &Name) { 5088 llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name); 5089 5090 if (!GV) { 5091 GV = new llvm::GlobalVariable(ObjCTypes.ClassnfABITy, false, 5092 llvm::GlobalValue::ExternalLinkage, 5093 0, Name, &CGM.getModule()); 5094 } 5095 5096 return GV; 5097} 5098 5099llvm::Value *CGObjCNonFragileABIMac::EmitClassRef(CGBuilderTy &Builder, 5100 const ObjCInterfaceDecl *ID) { 5101 llvm::GlobalVariable *&Entry = ClassReferences[ID->getIdentifier()]; 5102 5103 if (!Entry) { 5104 std::string ClassName(getClassSymbolPrefix() + ID->getNameAsString()); 5105 llvm::GlobalVariable *ClassGV = GetClassGlobal(ClassName); 5106 Entry = 5107 new llvm::GlobalVariable(ObjCTypes.ClassnfABIPtrTy, false, 5108 llvm::GlobalValue::InternalLinkage, 5109 ClassGV, 5110 "\01L_OBJC_CLASSLIST_REFERENCES_$_", 5111 &CGM.getModule()); 5112 Entry->setAlignment( 5113 CGM.getTargetData().getPrefTypeAlignment( 5114 ObjCTypes.ClassnfABIPtrTy)); 5115 Entry->setSection("__DATA, __objc_classrefs, regular, no_dead_strip"); 5116 UsedGlobals.push_back(Entry); 5117 } 5118 5119 return Builder.CreateLoad(Entry, false, "tmp"); 5120} 5121 5122llvm::Value * 5123CGObjCNonFragileABIMac::EmitSuperClassRef(CGBuilderTy &Builder, 5124 const ObjCInterfaceDecl *ID) { 5125 llvm::GlobalVariable *&Entry = SuperClassReferences[ID->getIdentifier()]; 5126 5127 if (!Entry) { 5128 std::string ClassName(getClassSymbolPrefix() + ID->getNameAsString()); 5129 llvm::GlobalVariable *ClassGV = GetClassGlobal(ClassName); 5130 Entry = 5131 new llvm::GlobalVariable(ObjCTypes.ClassnfABIPtrTy, false, 5132 llvm::GlobalValue::InternalLinkage, 5133 ClassGV, 5134 "\01L_OBJC_CLASSLIST_SUP_REFS_$_", 5135 &CGM.getModule()); 5136 Entry->setAlignment( 5137 CGM.getTargetData().getPrefTypeAlignment( 5138 ObjCTypes.ClassnfABIPtrTy)); 5139 Entry->setSection("__DATA, __objc_superrefs, regular, no_dead_strip"); 5140 UsedGlobals.push_back(Entry); 5141 } 5142 5143 return Builder.CreateLoad(Entry, false, "tmp"); 5144} 5145 5146/// EmitMetaClassRef - Return a Value * of the address of _class_t 5147/// meta-data 5148/// 5149llvm::Value *CGObjCNonFragileABIMac::EmitMetaClassRef(CGBuilderTy &Builder, 5150 const ObjCInterfaceDecl *ID) { 5151 llvm::GlobalVariable * &Entry = MetaClassReferences[ID->getIdentifier()]; 5152 if (Entry) 5153 return Builder.CreateLoad(Entry, false, "tmp"); 5154 5155 std::string MetaClassName(getMetaclassSymbolPrefix() + ID->getNameAsString()); 5156 llvm::GlobalVariable *MetaClassGV = GetClassGlobal(MetaClassName); 5157 Entry = 5158 new llvm::GlobalVariable(ObjCTypes.ClassnfABIPtrTy, false, 5159 llvm::GlobalValue::InternalLinkage, 5160 MetaClassGV, 5161 "\01L_OBJC_CLASSLIST_SUP_REFS_$_", 5162 &CGM.getModule()); 5163 Entry->setAlignment( 5164 CGM.getTargetData().getPrefTypeAlignment( 5165 ObjCTypes.ClassnfABIPtrTy)); 5166 5167 Entry->setSection("__DATA, __objc_superrefs, regular, no_dead_strip"); 5168 UsedGlobals.push_back(Entry); 5169 5170 return Builder.CreateLoad(Entry, false, "tmp"); 5171} 5172 5173/// GetClass - Return a reference to the class for the given interface 5174/// decl. 5175llvm::Value *CGObjCNonFragileABIMac::GetClass(CGBuilderTy &Builder, 5176 const ObjCInterfaceDecl *ID) { 5177 return EmitClassRef(Builder, ID); 5178} 5179 5180/// Generates a message send where the super is the receiver. This is 5181/// a message send to self with special delivery semantics indicating 5182/// which class's method should be called. 5183CodeGen::RValue 5184CGObjCNonFragileABIMac::GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF, 5185 QualType ResultType, 5186 Selector Sel, 5187 const ObjCInterfaceDecl *Class, 5188 bool isCategoryImpl, 5189 llvm::Value *Receiver, 5190 bool IsClassMessage, 5191 const CodeGen::CallArgList &CallArgs) { 5192 // ... 5193 // Create and init a super structure; this is a (receiver, class) 5194 // pair we will pass to objc_msgSendSuper. 5195 llvm::Value *ObjCSuper = 5196 CGF.Builder.CreateAlloca(ObjCTypes.SuperTy, 0, "objc_super"); 5197 5198 llvm::Value *ReceiverAsObject = 5199 CGF.Builder.CreateBitCast(Receiver, ObjCTypes.ObjectPtrTy); 5200 CGF.Builder.CreateStore(ReceiverAsObject, 5201 CGF.Builder.CreateStructGEP(ObjCSuper, 0)); 5202 5203 // If this is a class message the metaclass is passed as the target. 5204 llvm::Value *Target; 5205 if (IsClassMessage) { 5206 if (isCategoryImpl) { 5207 // Message sent to "super' in a class method defined in 5208 // a category implementation. 5209 Target = EmitClassRef(CGF.Builder, Class); 5210 Target = CGF.Builder.CreateStructGEP(Target, 0); 5211 Target = CGF.Builder.CreateLoad(Target); 5212 } 5213 else 5214 Target = EmitMetaClassRef(CGF.Builder, Class); 5215 } 5216 else 5217 Target = EmitSuperClassRef(CGF.Builder, Class); 5218 5219 // FIXME: We shouldn't need to do this cast, rectify the ASTContext and 5220 // ObjCTypes types. 5221 const llvm::Type *ClassTy = 5222 CGM.getTypes().ConvertType(CGF.getContext().getObjCClassType()); 5223 Target = CGF.Builder.CreateBitCast(Target, ClassTy); 5224 CGF.Builder.CreateStore(Target, 5225 CGF.Builder.CreateStructGEP(ObjCSuper, 1)); 5226 5227 return (LegacyDispatchedSelector(Sel)) 5228 ? EmitLegacyMessageSend(CGF, ResultType,EmitSelector(CGF.Builder, Sel), 5229 ObjCSuper, ObjCTypes.SuperPtrCTy, 5230 true, CallArgs, 5231 ObjCTypes) 5232 : EmitMessageSend(CGF, ResultType, Sel, 5233 ObjCSuper, ObjCTypes.SuperPtrCTy, 5234 true, CallArgs); 5235} 5236 5237llvm::Value *CGObjCNonFragileABIMac::EmitSelector(CGBuilderTy &Builder, 5238 Selector Sel) { 5239 llvm::GlobalVariable *&Entry = SelectorReferences[Sel]; 5240 5241 if (!Entry) { 5242 llvm::Constant *Casted = 5243 llvm::ConstantExpr::getBitCast(GetMethodVarName(Sel), 5244 ObjCTypes.SelectorPtrTy); 5245 Entry = 5246 new llvm::GlobalVariable(ObjCTypes.SelectorPtrTy, false, 5247 llvm::GlobalValue::InternalLinkage, 5248 Casted, "\01L_OBJC_SELECTOR_REFERENCES_", 5249 &CGM.getModule()); 5250 Entry->setSection("__DATA, __objc_selrefs, literal_pointers, no_dead_strip"); 5251 UsedGlobals.push_back(Entry); 5252 } 5253 5254 return Builder.CreateLoad(Entry, false, "tmp"); 5255} 5256/// EmitObjCIvarAssign - Code gen for assigning to a __strong object. 5257/// objc_assign_ivar (id src, id *dst) 5258/// 5259void CGObjCNonFragileABIMac::EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF, 5260 llvm::Value *src, llvm::Value *dst) 5261{ 5262 const llvm::Type * SrcTy = src->getType(); 5263 if (!isa<llvm::PointerType>(SrcTy)) { 5264 unsigned Size = CGM.getTargetData().getTypeAllocSize(SrcTy); 5265 assert(Size <= 8 && "does not support size > 8"); 5266 src = (Size == 4 ? CGF.Builder.CreateBitCast(src, ObjCTypes.IntTy) 5267 : CGF.Builder.CreateBitCast(src, ObjCTypes.LongTy)); 5268 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy); 5269 } 5270 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy); 5271 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy); 5272 CGF.Builder.CreateCall2(ObjCTypes.getGcAssignIvarFn(), 5273 src, dst, "assignivar"); 5274 return; 5275} 5276 5277/// EmitObjCStrongCastAssign - Code gen for assigning to a __strong cast object. 5278/// objc_assign_strongCast (id src, id *dst) 5279/// 5280void CGObjCNonFragileABIMac::EmitObjCStrongCastAssign( 5281 CodeGen::CodeGenFunction &CGF, 5282 llvm::Value *src, llvm::Value *dst) 5283{ 5284 const llvm::Type * SrcTy = src->getType(); 5285 if (!isa<llvm::PointerType>(SrcTy)) { 5286 unsigned Size = CGM.getTargetData().getTypeAllocSize(SrcTy); 5287 assert(Size <= 8 && "does not support size > 8"); 5288 src = (Size == 4 ? CGF.Builder.CreateBitCast(src, ObjCTypes.IntTy) 5289 : CGF.Builder.CreateBitCast(src, ObjCTypes.LongTy)); 5290 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy); 5291 } 5292 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy); 5293 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy); 5294 CGF.Builder.CreateCall2(ObjCTypes.getGcAssignStrongCastFn(), 5295 src, dst, "weakassign"); 5296 return; 5297} 5298 5299/// EmitObjCWeakRead - Code gen for loading value of a __weak 5300/// object: objc_read_weak (id *src) 5301/// 5302llvm::Value * CGObjCNonFragileABIMac::EmitObjCWeakRead( 5303 CodeGen::CodeGenFunction &CGF, 5304 llvm::Value *AddrWeakObj) 5305{ 5306 const llvm::Type* DestTy = 5307 cast<llvm::PointerType>(AddrWeakObj->getType())->getElementType(); 5308 AddrWeakObj = CGF.Builder.CreateBitCast(AddrWeakObj, ObjCTypes.PtrObjectPtrTy); 5309 llvm::Value *read_weak = CGF.Builder.CreateCall(ObjCTypes.getGcReadWeakFn(), 5310 AddrWeakObj, "weakread"); 5311 read_weak = CGF.Builder.CreateBitCast(read_weak, DestTy); 5312 return read_weak; 5313} 5314 5315/// EmitObjCWeakAssign - Code gen for assigning to a __weak object. 5316/// objc_assign_weak (id src, id *dst) 5317/// 5318void CGObjCNonFragileABIMac::EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF, 5319 llvm::Value *src, llvm::Value *dst) 5320{ 5321 const llvm::Type * SrcTy = src->getType(); 5322 if (!isa<llvm::PointerType>(SrcTy)) { 5323 unsigned Size = CGM.getTargetData().getTypeAllocSize(SrcTy); 5324 assert(Size <= 8 && "does not support size > 8"); 5325 src = (Size == 4 ? CGF.Builder.CreateBitCast(src, ObjCTypes.IntTy) 5326 : CGF.Builder.CreateBitCast(src, ObjCTypes.LongTy)); 5327 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy); 5328 } 5329 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy); 5330 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy); 5331 CGF.Builder.CreateCall2(ObjCTypes.getGcAssignWeakFn(), 5332 src, dst, "weakassign"); 5333 return; 5334} 5335 5336/// EmitObjCGlobalAssign - Code gen for assigning to a __strong object. 5337/// objc_assign_global (id src, id *dst) 5338/// 5339void CGObjCNonFragileABIMac::EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF, 5340 llvm::Value *src, llvm::Value *dst) 5341{ 5342 const llvm::Type * SrcTy = src->getType(); 5343 if (!isa<llvm::PointerType>(SrcTy)) { 5344 unsigned Size = CGM.getTargetData().getTypeAllocSize(SrcTy); 5345 assert(Size <= 8 && "does not support size > 8"); 5346 src = (Size == 4 ? CGF.Builder.CreateBitCast(src, ObjCTypes.IntTy) 5347 : CGF.Builder.CreateBitCast(src, ObjCTypes.LongTy)); 5348 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy); 5349 } 5350 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy); 5351 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy); 5352 CGF.Builder.CreateCall2(ObjCTypes.getGcAssignGlobalFn(), 5353 src, dst, "globalassign"); 5354 return; 5355} 5356 5357void 5358CGObjCNonFragileABIMac::EmitTryOrSynchronizedStmt(CodeGen::CodeGenFunction &CGF, 5359 const Stmt &S) { 5360 bool isTry = isa<ObjCAtTryStmt>(S); 5361 llvm::BasicBlock *TryBlock = CGF.createBasicBlock("try"); 5362 llvm::BasicBlock *PrevLandingPad = CGF.getInvokeDest(); 5363 llvm::BasicBlock *TryHandler = CGF.createBasicBlock("try.handler"); 5364 llvm::BasicBlock *FinallyBlock = CGF.createBasicBlock("finally"); 5365 llvm::BasicBlock *FinallyRethrow = CGF.createBasicBlock("finally.throw"); 5366 llvm::BasicBlock *FinallyEnd = CGF.createBasicBlock("finally.end"); 5367 5368 // For @synchronized, call objc_sync_enter(sync.expr). The 5369 // evaluation of the expression must occur before we enter the 5370 // @synchronized. We can safely avoid a temp here because jumps into 5371 // @synchronized are illegal & this will dominate uses. 5372 llvm::Value *SyncArg = 0; 5373 if (!isTry) { 5374 SyncArg = 5375 CGF.EmitScalarExpr(cast<ObjCAtSynchronizedStmt>(S).getSynchExpr()); 5376 SyncArg = CGF.Builder.CreateBitCast(SyncArg, ObjCTypes.ObjectPtrTy); 5377 CGF.Builder.CreateCall(ObjCTypes.getSyncEnterFn(), SyncArg); 5378 } 5379 5380 // Push an EH context entry, used for handling rethrows and jumps 5381 // through finally. 5382 CGF.PushCleanupBlock(FinallyBlock); 5383 5384 CGF.setInvokeDest(TryHandler); 5385 5386 CGF.EmitBlock(TryBlock); 5387 CGF.EmitStmt(isTry ? cast<ObjCAtTryStmt>(S).getTryBody() 5388 : cast<ObjCAtSynchronizedStmt>(S).getSynchBody()); 5389 CGF.EmitBranchThroughCleanup(FinallyEnd); 5390 5391 // Emit the exception handler. 5392 5393 CGF.EmitBlock(TryHandler); 5394 5395 llvm::Value *llvm_eh_exception = 5396 CGF.CGM.getIntrinsic(llvm::Intrinsic::eh_exception); 5397 llvm::Value *llvm_eh_selector_i64 = 5398 CGF.CGM.getIntrinsic(llvm::Intrinsic::eh_selector_i64); 5399 llvm::Value *llvm_eh_typeid_for_i64 = 5400 CGF.CGM.getIntrinsic(llvm::Intrinsic::eh_typeid_for_i64); 5401 llvm::Value *Exc = CGF.Builder.CreateCall(llvm_eh_exception, "exc"); 5402 llvm::Value *RethrowPtr = CGF.CreateTempAlloca(Exc->getType(), "_rethrow"); 5403 5404 llvm::SmallVector<llvm::Value*, 8> SelectorArgs; 5405 SelectorArgs.push_back(Exc); 5406 SelectorArgs.push_back(ObjCTypes.getEHPersonalityPtr()); 5407 5408 // Construct the lists of (type, catch body) to handle. 5409 llvm::SmallVector<std::pair<const ParmVarDecl*, const Stmt*>, 8> Handlers; 5410 bool HasCatchAll = false; 5411 if (isTry) { 5412 if (const ObjCAtCatchStmt* CatchStmt = 5413 cast<ObjCAtTryStmt>(S).getCatchStmts()) { 5414 for (; CatchStmt; CatchStmt = CatchStmt->getNextCatchStmt()) { 5415 const ParmVarDecl *CatchDecl = CatchStmt->getCatchParamDecl(); 5416 Handlers.push_back(std::make_pair(CatchDecl, CatchStmt->getCatchBody())); 5417 5418 // catch(...) always matches. 5419 if (!CatchDecl) { 5420 // Use i8* null here to signal this is a catch all, not a cleanup. 5421 llvm::Value *Null = llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy); 5422 SelectorArgs.push_back(Null); 5423 HasCatchAll = true; 5424 break; 5425 } 5426 5427 if (CGF.getContext().isObjCIdType(CatchDecl->getType()) || 5428 CatchDecl->getType()->isObjCQualifiedIdType()) { 5429 llvm::Value *IDEHType = 5430 CGM.getModule().getGlobalVariable("OBJC_EHTYPE_id"); 5431 if (!IDEHType) 5432 IDEHType = 5433 new llvm::GlobalVariable(ObjCTypes.EHTypeTy, false, 5434 llvm::GlobalValue::ExternalLinkage, 5435 0, "OBJC_EHTYPE_id", &CGM.getModule()); 5436 SelectorArgs.push_back(IDEHType); 5437 HasCatchAll = true; 5438 break; 5439 } 5440 5441 // All other types should be Objective-C interface pointer types. 5442 const PointerType *PT = CatchDecl->getType()->getAsPointerType(); 5443 assert(PT && "Invalid @catch type."); 5444 const ObjCInterfaceType *IT = 5445 PT->getPointeeType()->getAsObjCInterfaceType(); 5446 assert(IT && "Invalid @catch type."); 5447 llvm::Value *EHType = GetInterfaceEHType(IT->getDecl(), false); 5448 SelectorArgs.push_back(EHType); 5449 } 5450 } 5451 } 5452 5453 // We use a cleanup unless there was already a catch all. 5454 if (!HasCatchAll) { 5455 SelectorArgs.push_back(llvm::ConstantInt::get(llvm::Type::Int32Ty, 0)); 5456 Handlers.push_back(std::make_pair((const ParmVarDecl*) 0, (const Stmt*) 0)); 5457 } 5458 5459 llvm::Value *Selector = 5460 CGF.Builder.CreateCall(llvm_eh_selector_i64, 5461 SelectorArgs.begin(), SelectorArgs.end(), 5462 "selector"); 5463 for (unsigned i = 0, e = Handlers.size(); i != e; ++i) { 5464 const ParmVarDecl *CatchParam = Handlers[i].first; 5465 const Stmt *CatchBody = Handlers[i].second; 5466 5467 llvm::BasicBlock *Next = 0; 5468 5469 // The last handler always matches. 5470 if (i + 1 != e) { 5471 assert(CatchParam && "Only last handler can be a catch all."); 5472 5473 llvm::BasicBlock *Match = CGF.createBasicBlock("match"); 5474 Next = CGF.createBasicBlock("catch.next"); 5475 llvm::Value *Id = 5476 CGF.Builder.CreateCall(llvm_eh_typeid_for_i64, 5477 CGF.Builder.CreateBitCast(SelectorArgs[i+2], 5478 ObjCTypes.Int8PtrTy)); 5479 CGF.Builder.CreateCondBr(CGF.Builder.CreateICmpEQ(Selector, Id), 5480 Match, Next); 5481 5482 CGF.EmitBlock(Match); 5483 } 5484 5485 if (CatchBody) { 5486 llvm::BasicBlock *MatchEnd = CGF.createBasicBlock("match.end"); 5487 llvm::BasicBlock *MatchHandler = CGF.createBasicBlock("match.handler"); 5488 5489 // Cleanups must call objc_end_catch. 5490 // 5491 // FIXME: It seems incorrect for objc_begin_catch to be inside this 5492 // context, but this matches gcc. 5493 CGF.PushCleanupBlock(MatchEnd); 5494 CGF.setInvokeDest(MatchHandler); 5495 5496 llvm::Value *ExcObject = 5497 CGF.Builder.CreateCall(ObjCTypes.getObjCBeginCatchFn(), Exc); 5498 5499 // Bind the catch parameter if it exists. 5500 if (CatchParam) { 5501 ExcObject = 5502 CGF.Builder.CreateBitCast(ExcObject, 5503 CGF.ConvertType(CatchParam->getType())); 5504 // CatchParam is a ParmVarDecl because of the grammar 5505 // construction used to handle this, but for codegen purposes 5506 // we treat this as a local decl. 5507 CGF.EmitLocalBlockVarDecl(*CatchParam); 5508 CGF.Builder.CreateStore(ExcObject, CGF.GetAddrOfLocalVar(CatchParam)); 5509 } 5510 5511 CGF.ObjCEHValueStack.push_back(ExcObject); 5512 CGF.EmitStmt(CatchBody); 5513 CGF.ObjCEHValueStack.pop_back(); 5514 5515 CGF.EmitBranchThroughCleanup(FinallyEnd); 5516 5517 CGF.EmitBlock(MatchHandler); 5518 5519 llvm::Value *Exc = CGF.Builder.CreateCall(llvm_eh_exception, "exc"); 5520 // We are required to emit this call to satisfy LLVM, even 5521 // though we don't use the result. 5522 llvm::SmallVector<llvm::Value*, 8> Args; 5523 Args.push_back(Exc); 5524 Args.push_back(ObjCTypes.getEHPersonalityPtr()); 5525 Args.push_back(llvm::ConstantInt::get(llvm::Type::Int32Ty, 5526 0)); 5527 CGF.Builder.CreateCall(llvm_eh_selector_i64, Args.begin(), Args.end()); 5528 CGF.Builder.CreateStore(Exc, RethrowPtr); 5529 CGF.EmitBranchThroughCleanup(FinallyRethrow); 5530 5531 CodeGenFunction::CleanupBlockInfo Info = CGF.PopCleanupBlock(); 5532 5533 CGF.EmitBlock(MatchEnd); 5534 5535 // Unfortunately, we also have to generate another EH frame here 5536 // in case this throws. 5537 llvm::BasicBlock *MatchEndHandler = 5538 CGF.createBasicBlock("match.end.handler"); 5539 llvm::BasicBlock *Cont = CGF.createBasicBlock("invoke.cont"); 5540 CGF.Builder.CreateInvoke(ObjCTypes.getObjCEndCatchFn(), 5541 Cont, MatchEndHandler, 5542 Args.begin(), Args.begin()); 5543 5544 CGF.EmitBlock(Cont); 5545 if (Info.SwitchBlock) 5546 CGF.EmitBlock(Info.SwitchBlock); 5547 if (Info.EndBlock) 5548 CGF.EmitBlock(Info.EndBlock); 5549 5550 CGF.EmitBlock(MatchEndHandler); 5551 Exc = CGF.Builder.CreateCall(llvm_eh_exception, "exc"); 5552 // We are required to emit this call to satisfy LLVM, even 5553 // though we don't use the result. 5554 Args.clear(); 5555 Args.push_back(Exc); 5556 Args.push_back(ObjCTypes.getEHPersonalityPtr()); 5557 Args.push_back(llvm::ConstantInt::get(llvm::Type::Int32Ty, 5558 0)); 5559 CGF.Builder.CreateCall(llvm_eh_selector_i64, Args.begin(), Args.end()); 5560 CGF.Builder.CreateStore(Exc, RethrowPtr); 5561 CGF.EmitBranchThroughCleanup(FinallyRethrow); 5562 5563 if (Next) 5564 CGF.EmitBlock(Next); 5565 } else { 5566 assert(!Next && "catchup should be last handler."); 5567 5568 CGF.Builder.CreateStore(Exc, RethrowPtr); 5569 CGF.EmitBranchThroughCleanup(FinallyRethrow); 5570 } 5571 } 5572 5573 // Pop the cleanup entry, the @finally is outside this cleanup 5574 // scope. 5575 CodeGenFunction::CleanupBlockInfo Info = CGF.PopCleanupBlock(); 5576 CGF.setInvokeDest(PrevLandingPad); 5577 5578 CGF.EmitBlock(FinallyBlock); 5579 5580 if (isTry) { 5581 if (const ObjCAtFinallyStmt* FinallyStmt = 5582 cast<ObjCAtTryStmt>(S).getFinallyStmt()) 5583 CGF.EmitStmt(FinallyStmt->getFinallyBody()); 5584 } else { 5585 // Emit 'objc_sync_exit(expr)' as finally's sole statement for 5586 // @synchronized. 5587 CGF.Builder.CreateCall(ObjCTypes.getSyncExitFn(), SyncArg); 5588 } 5589 5590 if (Info.SwitchBlock) 5591 CGF.EmitBlock(Info.SwitchBlock); 5592 if (Info.EndBlock) 5593 CGF.EmitBlock(Info.EndBlock); 5594 5595 // Branch around the rethrow code. 5596 CGF.EmitBranch(FinallyEnd); 5597 5598 CGF.EmitBlock(FinallyRethrow); 5599 CGF.Builder.CreateCall(ObjCTypes.getUnwindResumeOrRethrowFn(), 5600 CGF.Builder.CreateLoad(RethrowPtr)); 5601 CGF.Builder.CreateUnreachable(); 5602 5603 CGF.EmitBlock(FinallyEnd); 5604} 5605 5606/// EmitThrowStmt - Generate code for a throw statement. 5607void CGObjCNonFragileABIMac::EmitThrowStmt(CodeGen::CodeGenFunction &CGF, 5608 const ObjCAtThrowStmt &S) { 5609 llvm::Value *Exception; 5610 if (const Expr *ThrowExpr = S.getThrowExpr()) { 5611 Exception = CGF.EmitScalarExpr(ThrowExpr); 5612 } else { 5613 assert((!CGF.ObjCEHValueStack.empty() && CGF.ObjCEHValueStack.back()) && 5614 "Unexpected rethrow outside @catch block."); 5615 Exception = CGF.ObjCEHValueStack.back(); 5616 } 5617 5618 llvm::Value *ExceptionAsObject = 5619 CGF.Builder.CreateBitCast(Exception, ObjCTypes.ObjectPtrTy, "tmp"); 5620 llvm::BasicBlock *InvokeDest = CGF.getInvokeDest(); 5621 if (InvokeDest) { 5622 llvm::BasicBlock *Cont = CGF.createBasicBlock("invoke.cont"); 5623 CGF.Builder.CreateInvoke(ObjCTypes.getExceptionThrowFn(), 5624 Cont, InvokeDest, 5625 &ExceptionAsObject, &ExceptionAsObject + 1); 5626 CGF.EmitBlock(Cont); 5627 } else 5628 CGF.Builder.CreateCall(ObjCTypes.getExceptionThrowFn(), ExceptionAsObject); 5629 CGF.Builder.CreateUnreachable(); 5630 5631 // Clear the insertion point to indicate we are in unreachable code. 5632 CGF.Builder.ClearInsertionPoint(); 5633} 5634 5635llvm::Value * 5636CGObjCNonFragileABIMac::GetInterfaceEHType(const ObjCInterfaceDecl *ID, 5637 bool ForDefinition) { 5638 llvm::GlobalVariable * &Entry = EHTypeReferences[ID->getIdentifier()]; 5639 5640 // If we don't need a definition, return the entry if found or check 5641 // if we use an external reference. 5642 if (!ForDefinition) { 5643 if (Entry) 5644 return Entry; 5645 5646 // If this type (or a super class) has the __objc_exception__ 5647 // attribute, emit an external reference. 5648 if (hasObjCExceptionAttribute(CGM.getContext(), ID)) 5649 return Entry = 5650 new llvm::GlobalVariable(ObjCTypes.EHTypeTy, false, 5651 llvm::GlobalValue::ExternalLinkage, 5652 0, 5653 (std::string("OBJC_EHTYPE_$_") + 5654 ID->getIdentifier()->getName()), 5655 &CGM.getModule()); 5656 } 5657 5658 // Otherwise we need to either make a new entry or fill in the 5659 // initializer. 5660 assert((!Entry || !Entry->hasInitializer()) && "Duplicate EHType definition"); 5661 std::string ClassName(getClassSymbolPrefix() + ID->getNameAsString()); 5662 std::string VTableName = "objc_ehtype_vtable"; 5663 llvm::GlobalVariable *VTableGV = 5664 CGM.getModule().getGlobalVariable(VTableName); 5665 if (!VTableGV) 5666 VTableGV = new llvm::GlobalVariable(ObjCTypes.Int8PtrTy, false, 5667 llvm::GlobalValue::ExternalLinkage, 5668 0, VTableName, &CGM.getModule()); 5669 5670 llvm::Value *VTableIdx = llvm::ConstantInt::get(llvm::Type::Int32Ty, 2); 5671 5672 std::vector<llvm::Constant*> Values(3); 5673 Values[0] = llvm::ConstantExpr::getGetElementPtr(VTableGV, &VTableIdx, 1); 5674 Values[1] = GetClassName(ID->getIdentifier()); 5675 Values[2] = GetClassGlobal(ClassName); 5676 llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.EHTypeTy, Values); 5677 5678 if (Entry) { 5679 Entry->setInitializer(Init); 5680 } else { 5681 Entry = new llvm::GlobalVariable(ObjCTypes.EHTypeTy, false, 5682 llvm::GlobalValue::WeakAnyLinkage, 5683 Init, 5684 (std::string("OBJC_EHTYPE_$_") + 5685 ID->getIdentifier()->getName()), 5686 &CGM.getModule()); 5687 } 5688 5689 if (CGM.getLangOptions().getVisibilityMode() == LangOptions::Hidden) 5690 Entry->setVisibility(llvm::GlobalValue::HiddenVisibility); 5691 Entry->setAlignment(8); 5692 5693 if (ForDefinition) { 5694 Entry->setSection("__DATA,__objc_const"); 5695 Entry->setLinkage(llvm::GlobalValue::ExternalLinkage); 5696 } else { 5697 Entry->setSection("__DATA,__datacoal_nt,coalesced"); 5698 } 5699 5700 return Entry; 5701} 5702 5703/* *** */ 5704 5705CodeGen::CGObjCRuntime * 5706CodeGen::CreateMacObjCRuntime(CodeGen::CodeGenModule &CGM) { 5707 return new CGObjCMac(CGM); 5708} 5709 5710CodeGen::CGObjCRuntime * 5711CodeGen::CreateMacNonFragileABIObjCRuntime(CodeGen::CodeGenModule &CGM) { 5712 return new CGObjCNonFragileABIMac(CGM); 5713} 5714