1 //===------- CGObjCGNU.cpp - Emit LLVM Code from ASTs for a Module --------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This provides Objective-C code generation targetting the GNU runtime. The
11 // class in this file generates structures used by the GNU Objective-C runtime
12 // library. These structures are defined in objc/objc.h and objc/objc-api.h in
13 // the GNU runtime distribution.
15 //===----------------------------------------------------------------------===//
17 #include "CGObjCRuntime.h"
18 #include "CodeGenModule.h"
19 #include "CodeGenFunction.h"
20 #include "CGException.h"
22 #include "clang/AST/ASTContext.h"
23 #include "clang/AST/Decl.h"
24 #include "clang/AST/DeclObjC.h"
25 #include "clang/AST/RecordLayout.h"
26 #include "clang/AST/StmtObjC.h"
28 #include "llvm/Intrinsics.h"
29 #include "llvm/Module.h"
30 #include "llvm/LLVMContext.h"
31 #include "llvm/ADT/SmallVector.h"
32 #include "llvm/ADT/StringMap.h"
33 #include "llvm/Support/Compiler.h"
34 #include "llvm/Target/TargetData.h"
39 using namespace clang;
40 using namespace CodeGen;
43 // The version of the runtime that this class targets. Must match the version
45 static const int RuntimeVersion = 8;
46 static const int NonFragileRuntimeVersion = 9;
47 static const int ProtocolVersion = 2;
48 static const int NonFragileProtocolVersion = 3;
51 class CGObjCGNU : public CodeGen::CGObjCRuntime {
53 CodeGen::CodeGenModule &CGM;
54 llvm::Module &TheModule;
55 const llvm::PointerType *SelectorTy;
56 const llvm::IntegerType *Int8Ty;
57 const llvm::PointerType *PtrToInt8Ty;
58 const llvm::FunctionType *IMPTy;
59 const llvm::PointerType *IdTy;
60 const llvm::PointerType *PtrToIdTy;
62 const llvm::IntegerType *IntTy;
63 const llvm::PointerType *PtrTy;
64 const llvm::IntegerType *LongTy;
65 const llvm::PointerType *PtrToIntTy;
66 llvm::GlobalAlias *ClassPtrAlias;
67 llvm::GlobalAlias *MetaClassPtrAlias;
68 std::vector<llvm::Constant*> Classes;
69 std::vector<llvm::Constant*> Categories;
70 std::vector<llvm::Constant*> ConstantStrings;
71 llvm::StringMap<llvm::Constant*> ObjCStrings;
72 llvm::Function *LoadFunction;
73 llvm::StringMap<llvm::Constant*> ExistingProtocols;
74 typedef std::pair<std::string, std::string> TypedSelector;
75 std::map<TypedSelector, llvm::GlobalAlias*> TypedSelectors;
76 llvm::StringMap<llvm::GlobalAlias*> UntypedSelectors;
77 // Selectors that we don't emit in GC mode
78 Selector RetainSel, ReleaseSel, AutoreleaseSel;
79 // Functions used for GC.
80 llvm::Constant *IvarAssignFn, *StrongCastAssignFn, *MemMoveFn, *WeakReadFn,
81 *WeakAssignFn, *GlobalAssignFn;
82 // Some zeros used for GEPs in lots of places.
83 llvm::Constant *Zeros[2];
84 llvm::Constant *NULLPtr;
85 llvm::LLVMContext &VMContext;
86 /// Metadata kind used to tie method lookups to message sends.
87 unsigned msgSendMDKind;
89 llvm::Constant *GenerateIvarList(
90 const llvm::SmallVectorImpl<llvm::Constant *> &IvarNames,
91 const llvm::SmallVectorImpl<llvm::Constant *> &IvarTypes,
92 const llvm::SmallVectorImpl<llvm::Constant *> &IvarOffsets);
93 llvm::Constant *GenerateMethodList(const std::string &ClassName,
94 const std::string &CategoryName,
95 const llvm::SmallVectorImpl<Selector> &MethodSels,
96 const llvm::SmallVectorImpl<llvm::Constant *> &MethodTypes,
97 bool isClassMethodList);
98 llvm::Constant *GenerateEmptyProtocol(const std::string &ProtocolName);
99 llvm::Constant *GeneratePropertyList(const ObjCImplementationDecl *OID,
100 llvm::SmallVectorImpl<Selector> &InstanceMethodSels,
101 llvm::SmallVectorImpl<llvm::Constant*> &InstanceMethodTypes);
102 llvm::Constant *GenerateProtocolList(
103 const llvm::SmallVectorImpl<std::string> &Protocols);
104 // To ensure that all protocols are seen by the runtime, we add a category on
105 // a class defined in the runtime, declaring no methods, but adopting the
107 void GenerateProtocolHolderCategory(void);
108 llvm::Constant *GenerateClassStructure(
109 llvm::Constant *MetaClass,
110 llvm::Constant *SuperClass,
113 llvm::Constant *Version,
114 llvm::Constant *InstanceSize,
115 llvm::Constant *IVars,
116 llvm::Constant *Methods,
117 llvm::Constant *Protocols,
118 llvm::Constant *IvarOffsets,
119 llvm::Constant *Properties,
121 llvm::Constant *GenerateProtocolMethodList(
122 const llvm::SmallVectorImpl<llvm::Constant *> &MethodNames,
123 const llvm::SmallVectorImpl<llvm::Constant *> &MethodTypes);
124 llvm::Constant *MakeConstantString(const std::string &Str, const std::string
126 llvm::Constant *ExportUniqueString(const std::string &Str, const std::string
128 llvm::Constant *MakeGlobal(const llvm::StructType *Ty,
129 std::vector<llvm::Constant*> &V, llvm::StringRef Name="",
130 llvm::GlobalValue::LinkageTypes linkage=llvm::GlobalValue::InternalLinkage);
131 llvm::Constant *MakeGlobal(const llvm::ArrayType *Ty,
132 std::vector<llvm::Constant*> &V, llvm::StringRef Name="",
133 llvm::GlobalValue::LinkageTypes linkage=llvm::GlobalValue::InternalLinkage);
134 llvm::GlobalVariable *ObjCIvarOffsetVariable(const ObjCInterfaceDecl *ID,
135 const ObjCIvarDecl *Ivar);
136 void EmitClassRef(const std::string &className);
137 llvm::Value* EnforceType(CGBuilderTy B, llvm::Value *V, const llvm::Type *Ty){
138 if (V->getType() == Ty) return V;
139 return B.CreateBitCast(V, Ty);
142 CGObjCGNU(CodeGen::CodeGenModule &cgm);
143 virtual llvm::Constant *GenerateConstantString(const StringLiteral *);
144 virtual CodeGen::RValue
145 GenerateMessageSend(CodeGen::CodeGenFunction &CGF,
146 ReturnValueSlot Return,
149 llvm::Value *Receiver,
150 const CallArgList &CallArgs,
151 const ObjCInterfaceDecl *Class,
152 const ObjCMethodDecl *Method);
153 virtual CodeGen::RValue
154 GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF,
155 ReturnValueSlot Return,
158 const ObjCInterfaceDecl *Class,
160 llvm::Value *Receiver,
162 const CallArgList &CallArgs,
163 const ObjCMethodDecl *Method);
164 virtual llvm::Value *GetClass(CGBuilderTy &Builder,
165 const ObjCInterfaceDecl *OID);
166 virtual llvm::Value *GetSelector(CGBuilderTy &Builder, Selector Sel,
168 virtual llvm::Value *GetSelector(CGBuilderTy &Builder, const ObjCMethodDecl
170 virtual llvm::Constant *GetEHType(QualType T);
172 virtual llvm::Function *GenerateMethod(const ObjCMethodDecl *OMD,
173 const ObjCContainerDecl *CD);
174 virtual void GenerateCategory(const ObjCCategoryImplDecl *CMD);
175 virtual void GenerateClass(const ObjCImplementationDecl *ClassDecl);
176 virtual llvm::Value *GenerateProtocolRef(CGBuilderTy &Builder,
177 const ObjCProtocolDecl *PD);
178 virtual void GenerateProtocol(const ObjCProtocolDecl *PD);
179 virtual llvm::Function *ModuleInitFunction();
180 virtual llvm::Function *GetPropertyGetFunction();
181 virtual llvm::Function *GetPropertySetFunction();
182 virtual llvm::Function *GetCopyStructFunction();
183 virtual llvm::Constant *EnumerationMutationFunction();
185 virtual void EmitTryStmt(CodeGen::CodeGenFunction &CGF,
186 const ObjCAtTryStmt &S);
187 virtual void EmitSynchronizedStmt(CodeGen::CodeGenFunction &CGF,
188 const ObjCAtSynchronizedStmt &S);
189 virtual void EmitThrowStmt(CodeGen::CodeGenFunction &CGF,
190 const ObjCAtThrowStmt &S);
191 virtual llvm::Value * EmitObjCWeakRead(CodeGen::CodeGenFunction &CGF,
192 llvm::Value *AddrWeakObj);
193 virtual void EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF,
194 llvm::Value *src, llvm::Value *dst);
195 virtual void EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF,
196 llvm::Value *src, llvm::Value *dest,
197 bool threadlocal=false);
198 virtual void EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF,
199 llvm::Value *src, llvm::Value *dest,
200 llvm::Value *ivarOffset);
201 virtual void EmitObjCStrongCastAssign(CodeGen::CodeGenFunction &CGF,
202 llvm::Value *src, llvm::Value *dest);
203 virtual void EmitGCMemmoveCollectable(CodeGen::CodeGenFunction &CGF,
204 llvm::Value *DestPtr,
207 virtual LValue EmitObjCValueForIvar(CodeGen::CodeGenFunction &CGF,
209 llvm::Value *BaseValue,
210 const ObjCIvarDecl *Ivar,
211 unsigned CVRQualifiers);
212 virtual llvm::Value *EmitIvarOffset(CodeGen::CodeGenFunction &CGF,
213 const ObjCInterfaceDecl *Interface,
214 const ObjCIvarDecl *Ivar);
215 virtual llvm::Constant *GCBlockLayout(CodeGen::CodeGenFunction &CGF,
216 const llvm::SmallVectorImpl<const BlockDeclRefExpr *> &) {
220 } // end anonymous namespace
223 /// Emits a reference to a dummy variable which is emitted with each class.
224 /// This ensures that a linker error will be generated when trying to link
225 /// together modules where a referenced class is not defined.
226 void CGObjCGNU::EmitClassRef(const std::string &className) {
227 std::string symbolRef = "__objc_class_ref_" + className;
228 // Don't emit two copies of the same symbol
229 if (TheModule.getGlobalVariable(symbolRef))
231 std::string symbolName = "__objc_class_name_" + className;
232 llvm::GlobalVariable *ClassSymbol = TheModule.getGlobalVariable(symbolName);
234 ClassSymbol = new llvm::GlobalVariable(TheModule, LongTy, false,
235 llvm::GlobalValue::ExternalLinkage, 0, symbolName);
237 new llvm::GlobalVariable(TheModule, ClassSymbol->getType(), true,
238 llvm::GlobalValue::WeakAnyLinkage, ClassSymbol, symbolRef);
241 static std::string SymbolNameForMethod(const std::string &ClassName, const
242 std::string &CategoryName, const std::string &MethodName, bool isClassMethod)
244 std::string MethodNameColonStripped = MethodName;
245 std::replace(MethodNameColonStripped.begin(), MethodNameColonStripped.end(),
247 return std::string(isClassMethod ? "_c_" : "_i_") + ClassName + "_" +
248 CategoryName + "_" + MethodNameColonStripped;
250 static std::string MangleSelectorTypes(const std::string &TypeString) {
251 std::string Mangled = TypeString;
252 // Simple mangling to avoid breaking when we mix JIT / static code.
253 // Not part of the ABI, subject to change without notice.
254 std::replace(Mangled.begin(), Mangled.end(), '@', '_');
255 std::replace(Mangled.begin(), Mangled.end(), ':', 'J');
256 std::replace(Mangled.begin(), Mangled.end(), '*', 'e');
257 std::replace(Mangled.begin(), Mangled.end(), '#', 'E');
258 std::replace(Mangled.begin(), Mangled.end(), ':', 'j');
259 std::replace(Mangled.begin(), Mangled.end(), '(', 'g');
260 std::replace(Mangled.begin(), Mangled.end(), ')', 'G');
261 std::replace(Mangled.begin(), Mangled.end(), '[', 'h');
262 std::replace(Mangled.begin(), Mangled.end(), ']', 'H');
266 CGObjCGNU::CGObjCGNU(CodeGen::CodeGenModule &cgm)
267 : CGM(cgm), TheModule(CGM.getModule()), ClassPtrAlias(0),
268 MetaClassPtrAlias(0), VMContext(cgm.getLLVMContext()) {
270 msgSendMDKind = VMContext.getMDKindID("GNUObjCMessageSend");
272 IntTy = cast<llvm::IntegerType>(
273 CGM.getTypes().ConvertType(CGM.getContext().IntTy));
274 LongTy = cast<llvm::IntegerType>(
275 CGM.getTypes().ConvertType(CGM.getContext().LongTy));
277 Int8Ty = llvm::Type::getInt8Ty(VMContext);
278 // C string type. Used in lots of places.
279 PtrToInt8Ty = llvm::PointerType::getUnqual(Int8Ty);
281 Zeros[0] = llvm::ConstantInt::get(LongTy, 0);
283 NULLPtr = llvm::ConstantPointerNull::get(PtrToInt8Ty);
284 // Get the selector Type.
285 QualType selTy = CGM.getContext().getObjCSelType();
286 if (QualType() == selTy) {
287 SelectorTy = PtrToInt8Ty;
289 SelectorTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(selTy));
292 PtrToIntTy = llvm::PointerType::getUnqual(IntTy);
296 ASTIdTy = CGM.getContext().getCanonicalType(CGM.getContext().getObjCIdType());
297 if (QualType() == ASTIdTy) {
300 IdTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(ASTIdTy));
302 PtrToIdTy = llvm::PointerType::getUnqual(IdTy);
305 std::vector<const llvm::Type*> IMPArgs;
306 IMPArgs.push_back(IdTy);
307 IMPArgs.push_back(SelectorTy);
308 IMPTy = llvm::FunctionType::get(IdTy, IMPArgs, true);
310 if (CGM.getLangOptions().getGCMode() != LangOptions::NonGC) {
311 // Get selectors needed in GC mode
312 RetainSel = GetNullarySelector("retain", CGM.getContext());
313 ReleaseSel = GetNullarySelector("release", CGM.getContext());
314 AutoreleaseSel = GetNullarySelector("autorelease", CGM.getContext());
316 // Get functions needed in GC mode
318 // id objc_assign_ivar(id, id, ptrdiff_t);
319 std::vector<const llvm::Type*> Args(1, IdTy);
320 Args.push_back(PtrToIdTy);
322 Args.push_back(LongTy);
323 llvm::FunctionType *FTy = llvm::FunctionType::get(IdTy, Args, false);
324 IvarAssignFn = CGM.CreateRuntimeFunction(FTy, "objc_assign_ivar");
325 // id objc_assign_strongCast (id, id*)
327 FTy = llvm::FunctionType::get(IdTy, Args, false);
329 CGM.CreateRuntimeFunction(FTy, "objc_assign_strongCast");
330 // id objc_assign_global(id, id*);
331 FTy = llvm::FunctionType::get(IdTy, Args, false);
332 GlobalAssignFn = CGM.CreateRuntimeFunction(FTy, "objc_assign_global");
333 // id objc_assign_weak(id, id*);
334 FTy = llvm::FunctionType::get(IdTy, Args, false);
335 WeakAssignFn = CGM.CreateRuntimeFunction(FTy, "objc_assign_weak");
336 // id objc_read_weak(id*);
338 Args.push_back(PtrToIdTy);
339 FTy = llvm::FunctionType::get(IdTy, Args, false);
340 WeakReadFn = CGM.CreateRuntimeFunction(FTy, "objc_read_weak");
341 // void *objc_memmove_collectable(void*, void *, size_t);
343 Args.push_back(PtrToInt8Ty);
344 Args.push_back(PtrToInt8Ty);
346 Args.push_back(LongTy);
347 FTy = llvm::FunctionType::get(IdTy, Args, false);
348 MemMoveFn = CGM.CreateRuntimeFunction(FTy, "objc_memmove_collectable");
352 // This has to perform the lookup every time, since posing and related
353 // techniques can modify the name -> class mapping.
354 llvm::Value *CGObjCGNU::GetClass(CGBuilderTy &Builder,
355 const ObjCInterfaceDecl *OID) {
356 llvm::Value *ClassName = CGM.GetAddrOfConstantCString(OID->getNameAsString());
357 // With the incompatible ABI, this will need to be replaced with a direct
358 // reference to the class symbol. For the compatible nonfragile ABI we are
359 // still performing this lookup at run time but emitting the symbol for the
360 // class externally so that we can make the switch later.
361 EmitClassRef(OID->getNameAsString());
362 ClassName = Builder.CreateStructGEP(ClassName, 0);
364 std::vector<const llvm::Type*> Params(1, PtrToInt8Ty);
365 llvm::Constant *ClassLookupFn =
366 CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy,
369 "objc_lookup_class");
370 return Builder.CreateCall(ClassLookupFn, ClassName);
373 llvm::Value *CGObjCGNU::GetSelector(CGBuilderTy &Builder, Selector Sel,
375 llvm::GlobalAlias *&US = UntypedSelectors[Sel.getAsString()];
377 US = new llvm::GlobalAlias(llvm::PointerType::getUnqual(SelectorTy),
378 llvm::GlobalValue::PrivateLinkage,
379 ".objc_untyped_selector_alias"+Sel.getAsString(),
383 return Builder.CreateLoad(US);
386 llvm::Value *CGObjCGNU::GetSelector(CGBuilderTy &Builder, const ObjCMethodDecl
389 std::string SelName = Method->getSelector().getAsString();
390 std::string SelTypes;
391 CGM.getContext().getObjCEncodingForMethodDecl(Method, SelTypes);
393 TypedSelector Selector = TypedSelector(SelName,
396 // If it's already cached, return it.
397 if (TypedSelectors[Selector]) {
398 return Builder.CreateLoad(TypedSelectors[Selector]);
401 // If it isn't, cache it.
402 llvm::GlobalAlias *Sel = new llvm::GlobalAlias(
403 llvm::PointerType::getUnqual(SelectorTy),
404 llvm::GlobalValue::PrivateLinkage, ".objc_selector_alias" + SelName,
406 TypedSelectors[Selector] = Sel;
408 return Builder.CreateLoad(Sel);
411 llvm::Constant *CGObjCGNU::GetEHType(QualType T) {
412 llvm_unreachable("asking for catch type for ObjC type in GNU runtime");
416 llvm::Constant *CGObjCGNU::MakeConstantString(const std::string &Str,
417 const std::string &Name) {
418 llvm::Constant *ConstStr = CGM.GetAddrOfConstantCString(Str, Name.c_str());
419 return llvm::ConstantExpr::getGetElementPtr(ConstStr, Zeros, 2);
421 llvm::Constant *CGObjCGNU::ExportUniqueString(const std::string &Str,
422 const std::string prefix) {
423 std::string name = prefix + Str;
424 llvm::Constant *ConstStr = TheModule.getGlobalVariable(name);
426 llvm::Constant *value = llvm::ConstantArray::get(VMContext, Str, true);
427 ConstStr = new llvm::GlobalVariable(TheModule, value->getType(), true,
428 llvm::GlobalValue::LinkOnceODRLinkage, value, prefix + Str);
430 return llvm::ConstantExpr::getGetElementPtr(ConstStr, Zeros, 2);
433 llvm::Constant *CGObjCGNU::MakeGlobal(const llvm::StructType *Ty,
434 std::vector<llvm::Constant*> &V, llvm::StringRef Name,
435 llvm::GlobalValue::LinkageTypes linkage) {
436 llvm::Constant *C = llvm::ConstantStruct::get(Ty, V);
437 return new llvm::GlobalVariable(TheModule, Ty, false,
438 llvm::GlobalValue::InternalLinkage, C, Name);
441 llvm::Constant *CGObjCGNU::MakeGlobal(const llvm::ArrayType *Ty,
442 std::vector<llvm::Constant*> &V, llvm::StringRef Name,
443 llvm::GlobalValue::LinkageTypes linkage) {
444 llvm::Constant *C = llvm::ConstantArray::get(Ty, V);
445 return new llvm::GlobalVariable(TheModule, Ty, false,
446 llvm::GlobalValue::InternalLinkage, C, Name);
449 /// Generate an NSConstantString object.
450 llvm::Constant *CGObjCGNU::GenerateConstantString(const StringLiteral *SL) {
452 std::string Str = SL->getString().str();
454 // Look for an existing one
455 llvm::StringMap<llvm::Constant*>::iterator old = ObjCStrings.find(Str);
456 if (old != ObjCStrings.end())
457 return old->getValue();
459 std::vector<llvm::Constant*> Ivars;
460 Ivars.push_back(NULLPtr);
461 Ivars.push_back(MakeConstantString(Str));
462 Ivars.push_back(llvm::ConstantInt::get(IntTy, Str.size()));
463 llvm::Constant *ObjCStr = MakeGlobal(
464 llvm::StructType::get(VMContext, PtrToInt8Ty, PtrToInt8Ty, IntTy, NULL),
466 ObjCStr = llvm::ConstantExpr::getBitCast(ObjCStr, PtrToInt8Ty);
467 ObjCStrings[Str] = ObjCStr;
468 ConstantStrings.push_back(ObjCStr);
472 ///Generates a message send where the super is the receiver. This is a message
473 ///send to self with special delivery semantics indicating which class's method
476 CGObjCGNU::GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF,
477 ReturnValueSlot Return,
480 const ObjCInterfaceDecl *Class,
482 llvm::Value *Receiver,
484 const CallArgList &CallArgs,
485 const ObjCMethodDecl *Method) {
486 if (CGM.getLangOptions().getGCMode() != LangOptions::NonGC) {
487 if (Sel == RetainSel || Sel == AutoreleaseSel) {
488 return RValue::get(Receiver);
490 if (Sel == ReleaseSel) {
491 return RValue::get(0);
495 CGBuilderTy &Builder = CGF.Builder;
496 llvm::Value *cmd = GetSelector(Builder, Sel);
499 CallArgList ActualArgs;
501 ActualArgs.push_back(
502 std::make_pair(RValue::get(Builder.CreateBitCast(Receiver, IdTy)),
504 ActualArgs.push_back(std::make_pair(RValue::get(cmd),
505 CGF.getContext().getObjCSelType()));
506 ActualArgs.insert(ActualArgs.end(), CallArgs.begin(), CallArgs.end());
508 CodeGenTypes &Types = CGM.getTypes();
509 const CGFunctionInfo &FnInfo = Types.getFunctionInfo(ResultType, ActualArgs,
510 FunctionType::ExtInfo());
511 const llvm::FunctionType *impType =
512 Types.GetFunctionType(FnInfo, Method ? Method->isVariadic() : false);
514 llvm::Value *ReceiverClass = 0;
515 if (isCategoryImpl) {
516 llvm::Constant *classLookupFunction = 0;
517 std::vector<const llvm::Type*> Params;
518 Params.push_back(PtrTy);
519 if (IsClassMessage) {
520 classLookupFunction = CGM.CreateRuntimeFunction(llvm::FunctionType::get(
521 IdTy, Params, true), "objc_get_meta_class");
523 classLookupFunction = CGM.CreateRuntimeFunction(llvm::FunctionType::get(
524 IdTy, Params, true), "objc_get_class");
526 ReceiverClass = Builder.CreateCall(classLookupFunction,
527 MakeConstantString(Class->getNameAsString()));
529 // Set up global aliases for the metaclass or class pointer if they do not
530 // already exist. These will are forward-references which will be set to
531 // pointers to the class and metaclass structure created for the runtime
532 // load function. To send a message to super, we look up the value of the
533 // super_class pointer from either the class or metaclass structure.
534 if (IsClassMessage) {
535 if (!MetaClassPtrAlias) {
536 MetaClassPtrAlias = new llvm::GlobalAlias(IdTy,
537 llvm::GlobalValue::InternalLinkage, ".objc_metaclass_ref" +
538 Class->getNameAsString(), NULL, &TheModule);
540 ReceiverClass = MetaClassPtrAlias;
542 if (!ClassPtrAlias) {
543 ClassPtrAlias = new llvm::GlobalAlias(IdTy,
544 llvm::GlobalValue::InternalLinkage, ".objc_class_ref" +
545 Class->getNameAsString(), NULL, &TheModule);
547 ReceiverClass = ClassPtrAlias;
550 // Cast the pointer to a simplified version of the class structure
551 ReceiverClass = Builder.CreateBitCast(ReceiverClass,
552 llvm::PointerType::getUnqual(
553 llvm::StructType::get(VMContext, IdTy, IdTy, NULL)));
554 // Get the superclass pointer
555 ReceiverClass = Builder.CreateStructGEP(ReceiverClass, 1);
556 // Load the superclass pointer
557 ReceiverClass = Builder.CreateLoad(ReceiverClass);
558 // Construct the structure used to look up the IMP
559 llvm::StructType *ObjCSuperTy = llvm::StructType::get(VMContext,
560 Receiver->getType(), IdTy, NULL);
561 llvm::Value *ObjCSuper = Builder.CreateAlloca(ObjCSuperTy);
563 Builder.CreateStore(Receiver, Builder.CreateStructGEP(ObjCSuper, 0));
564 Builder.CreateStore(ReceiverClass, Builder.CreateStructGEP(ObjCSuper, 1));
567 std::vector<const llvm::Type*> Params;
568 Params.push_back(llvm::PointerType::getUnqual(ObjCSuperTy));
569 Params.push_back(SelectorTy);
571 llvm::Value *lookupArgs[] = {ObjCSuper, cmd};
574 if (CGM.getContext().getLangOptions().ObjCNonFragileABI) {
575 // The lookup function returns a slot, which can be safely cached.
576 llvm::Type *SlotTy = llvm::StructType::get(VMContext, PtrTy, PtrTy, PtrTy,
577 IntTy, llvm::PointerType::getUnqual(impType), NULL);
579 llvm::Constant *lookupFunction =
580 CGM.CreateRuntimeFunction(llvm::FunctionType::get(
581 llvm::PointerType::getUnqual(SlotTy), Params, true),
582 "objc_slot_lookup_super");
584 llvm::CallInst *slot = Builder.CreateCall(lookupFunction, lookupArgs,
586 slot->setOnlyReadsMemory();
588 imp = Builder.CreateLoad(Builder.CreateStructGEP(slot, 4));
590 llvm::Constant *lookupFunction =
591 CGM.CreateRuntimeFunction(llvm::FunctionType::get(
592 llvm::PointerType::getUnqual(impType), Params, true),
593 "objc_msg_lookup_super");
594 imp = Builder.CreateCall(lookupFunction, lookupArgs, lookupArgs+2);
597 llvm::Value *impMD[] = {
598 llvm::MDString::get(VMContext, Sel.getAsString()),
599 llvm::MDString::get(VMContext, Class->getSuperClass()->getNameAsString()),
600 llvm::ConstantInt::get(llvm::Type::getInt1Ty(VMContext), IsClassMessage)
602 llvm::MDNode *node = llvm::MDNode::get(VMContext, impMD, 3);
604 llvm::Instruction *call;
605 RValue msgRet = CGF.EmitCall(FnInfo, imp, Return, ActualArgs,
607 call->setMetadata(msgSendMDKind, node);
611 /// Generate code for a message send expression.
613 CGObjCGNU::GenerateMessageSend(CodeGen::CodeGenFunction &CGF,
614 ReturnValueSlot Return,
617 llvm::Value *Receiver,
618 const CallArgList &CallArgs,
619 const ObjCInterfaceDecl *Class,
620 const ObjCMethodDecl *Method) {
621 // Strip out message sends to retain / release in GC mode
622 if (CGM.getLangOptions().getGCMode() != LangOptions::NonGC) {
623 if (Sel == RetainSel || Sel == AutoreleaseSel) {
624 return RValue::get(Receiver);
626 if (Sel == ReleaseSel) {
627 return RValue::get(0);
631 CGBuilderTy &Builder = CGF.Builder;
633 // If the return type is something that goes in an integer register, the
634 // runtime will handle 0 returns. For other cases, we fill in the 0 value
637 // The language spec says the result of this kind of message send is
638 // undefined, but lots of people seem to have forgotten to read that
639 // paragraph and insist on sending messages to nil that have structure
640 // returns. With GCC, this generates a random return value (whatever happens
641 // to be on the stack / in those registers at the time) on most platforms,
642 // and generates a SegV on SPARC. With LLVM it corrupts the stack.
643 bool isPointerSizedReturn = false;
644 if (ResultType->isAnyPointerType() ||
645 ResultType->isIntegralOrEnumerationType() || ResultType->isVoidType())
646 isPointerSizedReturn = true;
648 llvm::BasicBlock *startBB = 0;
649 llvm::BasicBlock *messageBB = 0;
650 llvm::BasicBlock *continueBB = 0;
652 if (!isPointerSizedReturn) {
653 startBB = Builder.GetInsertBlock();
654 messageBB = CGF.createBasicBlock("msgSend");
655 continueBB = CGF.createBasicBlock("continue");
657 llvm::Value *isNil = Builder.CreateICmpEQ(Receiver,
658 llvm::Constant::getNullValue(Receiver->getType()));
659 Builder.CreateCondBr(isNil, continueBB, messageBB);
660 CGF.EmitBlock(messageBB);
663 IdTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(ASTIdTy));
666 cmd = GetSelector(Builder, Method);
668 cmd = GetSelector(Builder, Sel);
669 CallArgList ActualArgs;
671 Receiver = Builder.CreateBitCast(Receiver, IdTy);
672 ActualArgs.push_back(
673 std::make_pair(RValue::get(Receiver), ASTIdTy));
674 ActualArgs.push_back(std::make_pair(RValue::get(cmd),
675 CGF.getContext().getObjCSelType()));
676 ActualArgs.insert(ActualArgs.end(), CallArgs.begin(), CallArgs.end());
678 CodeGenTypes &Types = CGM.getTypes();
679 const CGFunctionInfo &FnInfo = Types.getFunctionInfo(ResultType, ActualArgs,
680 FunctionType::ExtInfo());
681 const llvm::FunctionType *impType =
682 Types.GetFunctionType(FnInfo, Method ? Method->isVariadic() : false);
684 llvm::Value *impMD[] = {
685 llvm::MDString::get(VMContext, Sel.getAsString()),
686 llvm::MDString::get(VMContext, Class ? Class->getNameAsString() :""),
687 llvm::ConstantInt::get(llvm::Type::getInt1Ty(VMContext), Class!=0)
689 llvm::MDNode *node = llvm::MDNode::get(VMContext, impMD, 3);
693 // For sender-aware dispatch, we pass the sender as the third argument to a
694 // lookup function. When sending messages from C code, the sender is nil.
695 // objc_msg_lookup_sender(id *receiver, SEL selector, id sender);
696 if (CGM.getContext().getLangOptions().ObjCNonFragileABI) {
698 std::vector<const llvm::Type*> Params;
699 llvm::Value *ReceiverPtr = CGF.CreateTempAlloca(Receiver->getType());
700 Builder.CreateStore(Receiver, ReceiverPtr);
701 Params.push_back(ReceiverPtr->getType());
702 Params.push_back(SelectorTy);
705 if (isa<ObjCMethodDecl>(CGF.CurCodeDecl)) {
706 self = CGF.LoadObjCSelf();
708 self = llvm::ConstantPointerNull::get(IdTy);
711 Params.push_back(self->getType());
713 // The lookup function returns a slot, which can be safely cached.
714 llvm::Type *SlotTy = llvm::StructType::get(VMContext, PtrTy, PtrTy, PtrTy,
715 IntTy, llvm::PointerType::getUnqual(impType), NULL);
716 llvm::Constant *lookupFunction =
717 CGM.CreateRuntimeFunction(llvm::FunctionType::get(
718 llvm::PointerType::getUnqual(SlotTy), Params, true),
719 "objc_msg_lookup_sender");
721 // The lookup function is guaranteed not to capture the receiver pointer.
722 if (llvm::Function *LookupFn = dyn_cast<llvm::Function>(lookupFunction)) {
723 LookupFn->setDoesNotCapture(1);
726 llvm::CallInst *slot =
727 Builder.CreateCall3(lookupFunction, ReceiverPtr, cmd, self);
728 slot->setOnlyReadsMemory();
729 slot->setMetadata(msgSendMDKind, node);
731 imp = Builder.CreateLoad(Builder.CreateStructGEP(slot, 4));
733 // The lookup function may have changed the receiver, so make sure we use
735 ActualArgs[0] = std::make_pair(RValue::get(
736 Builder.CreateLoad(ReceiverPtr, true)), ASTIdTy);
738 std::vector<const llvm::Type*> Params;
739 Params.push_back(Receiver->getType());
740 Params.push_back(SelectorTy);
741 llvm::Constant *lookupFunction =
742 CGM.CreateRuntimeFunction(llvm::FunctionType::get(
743 llvm::PointerType::getUnqual(impType), Params, true),
746 imp = Builder.CreateCall2(lookupFunction, Receiver, cmd);
747 cast<llvm::CallInst>(imp)->setMetadata(msgSendMDKind, node);
749 llvm::Instruction *call;
750 RValue msgRet = CGF.EmitCall(FnInfo, imp, Return, ActualArgs,
752 call->setMetadata(msgSendMDKind, node);
755 if (!isPointerSizedReturn) {
756 messageBB = CGF.Builder.GetInsertBlock();
757 CGF.Builder.CreateBr(continueBB);
758 CGF.EmitBlock(continueBB);
759 if (msgRet.isScalar()) {
760 llvm::Value *v = msgRet.getScalarVal();
761 llvm::PHINode *phi = Builder.CreatePHI(v->getType());
762 phi->addIncoming(v, messageBB);
763 phi->addIncoming(llvm::Constant::getNullValue(v->getType()), startBB);
764 msgRet = RValue::get(phi);
765 } else if (msgRet.isAggregate()) {
766 llvm::Value *v = msgRet.getAggregateAddr();
767 llvm::PHINode *phi = Builder.CreatePHI(v->getType());
768 const llvm::PointerType *RetTy = cast<llvm::PointerType>(v->getType());
769 llvm::AllocaInst *NullVal =
770 CGF.CreateTempAlloca(RetTy->getElementType(), "null");
771 CGF.InitTempAlloca(NullVal,
772 llvm::Constant::getNullValue(RetTy->getElementType()));
773 phi->addIncoming(v, messageBB);
774 phi->addIncoming(NullVal, startBB);
775 msgRet = RValue::getAggregate(phi);
776 } else /* isComplex() */ {
777 std::pair<llvm::Value*,llvm::Value*> v = msgRet.getComplexVal();
778 llvm::PHINode *phi = Builder.CreatePHI(v.first->getType());
779 phi->addIncoming(v.first, messageBB);
780 phi->addIncoming(llvm::Constant::getNullValue(v.first->getType()),
782 llvm::PHINode *phi2 = Builder.CreatePHI(v.second->getType());
783 phi2->addIncoming(v.second, messageBB);
784 phi2->addIncoming(llvm::Constant::getNullValue(v.second->getType()),
786 msgRet = RValue::getComplex(phi, phi2);
792 /// Generates a MethodList. Used in construction of a objc_class and
793 /// objc_category structures.
794 llvm::Constant *CGObjCGNU::GenerateMethodList(const std::string &ClassName,
795 const std::string &CategoryName,
796 const llvm::SmallVectorImpl<Selector> &MethodSels,
797 const llvm::SmallVectorImpl<llvm::Constant *> &MethodTypes,
798 bool isClassMethodList) {
799 if (MethodSels.empty())
801 // Get the method structure type.
802 llvm::StructType *ObjCMethodTy = llvm::StructType::get(VMContext,
803 PtrToInt8Ty, // Really a selector, but the runtime creates it us.
804 PtrToInt8Ty, // Method types
805 llvm::PointerType::getUnqual(IMPTy), //Method pointer
807 std::vector<llvm::Constant*> Methods;
808 std::vector<llvm::Constant*> Elements;
809 for (unsigned int i = 0, e = MethodTypes.size(); i < e; ++i) {
811 if (llvm::Constant *Method =
812 TheModule.getFunction(SymbolNameForMethod(ClassName, CategoryName,
813 MethodSels[i].getAsString(),
814 isClassMethodList))) {
815 llvm::Constant *C = MakeConstantString(MethodSels[i].getAsString());
816 Elements.push_back(C);
817 Elements.push_back(MethodTypes[i]);
818 Method = llvm::ConstantExpr::getBitCast(Method,
819 llvm::PointerType::getUnqual(IMPTy));
820 Elements.push_back(Method);
821 Methods.push_back(llvm::ConstantStruct::get(ObjCMethodTy, Elements));
825 // Array of method structures
826 llvm::ArrayType *ObjCMethodArrayTy = llvm::ArrayType::get(ObjCMethodTy,
828 llvm::Constant *MethodArray = llvm::ConstantArray::get(ObjCMethodArrayTy,
831 // Structure containing list pointer, array and array count
832 llvm::SmallVector<const llvm::Type*, 16> ObjCMethodListFields;
833 llvm::PATypeHolder OpaqueNextTy = llvm::OpaqueType::get(VMContext);
834 llvm::Type *NextPtrTy = llvm::PointerType::getUnqual(OpaqueNextTy);
835 llvm::StructType *ObjCMethodListTy = llvm::StructType::get(VMContext,
840 // Refine next pointer type to concrete type
841 llvm::cast<llvm::OpaqueType>(
842 OpaqueNextTy.get())->refineAbstractTypeTo(ObjCMethodListTy);
843 ObjCMethodListTy = llvm::cast<llvm::StructType>(OpaqueNextTy.get());
846 Methods.push_back(llvm::ConstantPointerNull::get(
847 llvm::PointerType::getUnqual(ObjCMethodListTy)));
848 Methods.push_back(llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext),
849 MethodTypes.size()));
850 Methods.push_back(MethodArray);
852 // Create an instance of the structure
853 return MakeGlobal(ObjCMethodListTy, Methods, ".objc_method_list");
856 /// Generates an IvarList. Used in construction of a objc_class.
857 llvm::Constant *CGObjCGNU::GenerateIvarList(
858 const llvm::SmallVectorImpl<llvm::Constant *> &IvarNames,
859 const llvm::SmallVectorImpl<llvm::Constant *> &IvarTypes,
860 const llvm::SmallVectorImpl<llvm::Constant *> &IvarOffsets) {
861 if (IvarNames.size() == 0)
863 // Get the method structure type.
864 llvm::StructType *ObjCIvarTy = llvm::StructType::get(VMContext,
869 std::vector<llvm::Constant*> Ivars;
870 std::vector<llvm::Constant*> Elements;
871 for (unsigned int i = 0, e = IvarNames.size() ; i < e ; i++) {
873 Elements.push_back(IvarNames[i]);
874 Elements.push_back(IvarTypes[i]);
875 Elements.push_back(IvarOffsets[i]);
876 Ivars.push_back(llvm::ConstantStruct::get(ObjCIvarTy, Elements));
879 // Array of method structures
880 llvm::ArrayType *ObjCIvarArrayTy = llvm::ArrayType::get(ObjCIvarTy,
885 Elements.push_back(llvm::ConstantInt::get(IntTy, (int)IvarNames.size()));
886 Elements.push_back(llvm::ConstantArray::get(ObjCIvarArrayTy, Ivars));
887 // Structure containing array and array count
888 llvm::StructType *ObjCIvarListTy = llvm::StructType::get(VMContext, IntTy,
892 // Create an instance of the structure
893 return MakeGlobal(ObjCIvarListTy, Elements, ".objc_ivar_list");
896 /// Generate a class structure
897 llvm::Constant *CGObjCGNU::GenerateClassStructure(
898 llvm::Constant *MetaClass,
899 llvm::Constant *SuperClass,
902 llvm::Constant *Version,
903 llvm::Constant *InstanceSize,
904 llvm::Constant *IVars,
905 llvm::Constant *Methods,
906 llvm::Constant *Protocols,
907 llvm::Constant *IvarOffsets,
908 llvm::Constant *Properties,
910 // Set up the class structure
911 // Note: Several of these are char*s when they should be ids. This is
912 // because the runtime performs this translation on load.
914 // Fields marked New ABI are part of the GNUstep runtime. We emit them
915 // anyway; the classes will still work with the GNU runtime, they will just
917 llvm::StructType *ClassTy = llvm::StructType::get(VMContext,
918 PtrToInt8Ty, // class_pointer
919 PtrToInt8Ty, // super_class
923 LongTy, // instance_size
924 IVars->getType(), // ivars
925 Methods->getType(), // methods
926 // These are all filled in by the runtime, so we pretend
928 PtrTy, // subclass_list
929 PtrTy, // sibling_class
931 PtrTy, // gc_object_type
933 LongTy, // abi_version
934 IvarOffsets->getType(), // ivar_offsets
935 Properties->getType(), // properties
937 llvm::Constant *Zero = llvm::ConstantInt::get(LongTy, 0);
938 // Fill in the structure
939 std::vector<llvm::Constant*> Elements;
940 Elements.push_back(llvm::ConstantExpr::getBitCast(MetaClass, PtrToInt8Ty));
941 Elements.push_back(SuperClass);
942 Elements.push_back(MakeConstantString(Name, ".class_name"));
943 Elements.push_back(Zero);
944 Elements.push_back(llvm::ConstantInt::get(LongTy, info));
945 Elements.push_back(InstanceSize);
946 Elements.push_back(IVars);
947 Elements.push_back(Methods);
948 Elements.push_back(NULLPtr);
949 Elements.push_back(NULLPtr);
950 Elements.push_back(NULLPtr);
951 Elements.push_back(llvm::ConstantExpr::getBitCast(Protocols, PtrTy));
952 Elements.push_back(NULLPtr);
953 Elements.push_back(Zero);
954 Elements.push_back(IvarOffsets);
955 Elements.push_back(Properties);
956 // Create an instance of the structure
957 // This is now an externally visible symbol, so that we can speed up class
958 // messages in the next ABI.
959 return MakeGlobal(ClassTy, Elements, (isMeta ? "_OBJC_METACLASS_":
960 "_OBJC_CLASS_") + std::string(Name), llvm::GlobalValue::ExternalLinkage);
963 llvm::Constant *CGObjCGNU::GenerateProtocolMethodList(
964 const llvm::SmallVectorImpl<llvm::Constant *> &MethodNames,
965 const llvm::SmallVectorImpl<llvm::Constant *> &MethodTypes) {
966 // Get the method structure type.
967 llvm::StructType *ObjCMethodDescTy = llvm::StructType::get(VMContext,
968 PtrToInt8Ty, // Really a selector, but the runtime does the casting for us.
971 std::vector<llvm::Constant*> Methods;
972 std::vector<llvm::Constant*> Elements;
973 for (unsigned int i = 0, e = MethodTypes.size() ; i < e ; i++) {
975 Elements.push_back(MethodNames[i]);
976 Elements.push_back(MethodTypes[i]);
977 Methods.push_back(llvm::ConstantStruct::get(ObjCMethodDescTy, Elements));
979 llvm::ArrayType *ObjCMethodArrayTy = llvm::ArrayType::get(ObjCMethodDescTy,
981 llvm::Constant *Array = llvm::ConstantArray::get(ObjCMethodArrayTy,
983 llvm::StructType *ObjCMethodDescListTy = llvm::StructType::get(VMContext,
984 IntTy, ObjCMethodArrayTy, NULL);
986 Methods.push_back(llvm::ConstantInt::get(IntTy, MethodNames.size()));
987 Methods.push_back(Array);
988 return MakeGlobal(ObjCMethodDescListTy, Methods, ".objc_method_list");
991 // Create the protocol list structure used in classes, categories and so on
992 llvm::Constant *CGObjCGNU::GenerateProtocolList(
993 const llvm::SmallVectorImpl<std::string> &Protocols) {
994 llvm::ArrayType *ProtocolArrayTy = llvm::ArrayType::get(PtrToInt8Ty,
996 llvm::StructType *ProtocolListTy = llvm::StructType::get(VMContext,
997 PtrTy, //Should be a recurisve pointer, but it's always NULL here.
998 LongTy,//FIXME: Should be size_t
1001 std::vector<llvm::Constant*> Elements;
1002 for (const std::string *iter = Protocols.begin(), *endIter = Protocols.end();
1003 iter != endIter ; iter++) {
1004 llvm::Constant *protocol = 0;
1005 llvm::StringMap<llvm::Constant*>::iterator value =
1006 ExistingProtocols.find(*iter);
1007 if (value == ExistingProtocols.end()) {
1008 protocol = GenerateEmptyProtocol(*iter);
1010 protocol = value->getValue();
1012 llvm::Constant *Ptr = llvm::ConstantExpr::getBitCast(protocol,
1014 Elements.push_back(Ptr);
1016 llvm::Constant * ProtocolArray = llvm::ConstantArray::get(ProtocolArrayTy,
1019 Elements.push_back(NULLPtr);
1020 Elements.push_back(llvm::ConstantInt::get(LongTy, Protocols.size()));
1021 Elements.push_back(ProtocolArray);
1022 return MakeGlobal(ProtocolListTy, Elements, ".objc_protocol_list");
1025 llvm::Value *CGObjCGNU::GenerateProtocolRef(CGBuilderTy &Builder,
1026 const ObjCProtocolDecl *PD) {
1027 llvm::Value *protocol = ExistingProtocols[PD->getNameAsString()];
1028 const llvm::Type *T =
1029 CGM.getTypes().ConvertType(CGM.getContext().getObjCProtoType());
1030 return Builder.CreateBitCast(protocol, llvm::PointerType::getUnqual(T));
1033 llvm::Constant *CGObjCGNU::GenerateEmptyProtocol(
1034 const std::string &ProtocolName) {
1035 llvm::SmallVector<std::string, 0> EmptyStringVector;
1036 llvm::SmallVector<llvm::Constant*, 0> EmptyConstantVector;
1038 llvm::Constant *ProtocolList = GenerateProtocolList(EmptyStringVector);
1039 llvm::Constant *MethodList =
1040 GenerateProtocolMethodList(EmptyConstantVector, EmptyConstantVector);
1041 // Protocols are objects containing lists of the methods implemented and
1042 // protocols adopted.
1043 llvm::StructType *ProtocolTy = llvm::StructType::get(VMContext, IdTy,
1045 ProtocolList->getType(),
1046 MethodList->getType(),
1047 MethodList->getType(),
1048 MethodList->getType(),
1049 MethodList->getType(),
1051 std::vector<llvm::Constant*> Elements;
1052 // The isa pointer must be set to a magic number so the runtime knows it's
1053 // the correct layout.
1054 int Version = CGM.getContext().getLangOptions().ObjCNonFragileABI ?
1055 NonFragileProtocolVersion : ProtocolVersion;
1056 Elements.push_back(llvm::ConstantExpr::getIntToPtr(
1057 llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), Version), IdTy));
1058 Elements.push_back(MakeConstantString(ProtocolName, ".objc_protocol_name"));
1059 Elements.push_back(ProtocolList);
1060 Elements.push_back(MethodList);
1061 Elements.push_back(MethodList);
1062 Elements.push_back(MethodList);
1063 Elements.push_back(MethodList);
1064 return MakeGlobal(ProtocolTy, Elements, ".objc_protocol");
1067 void CGObjCGNU::GenerateProtocol(const ObjCProtocolDecl *PD) {
1068 ASTContext &Context = CGM.getContext();
1069 std::string ProtocolName = PD->getNameAsString();
1070 llvm::SmallVector<std::string, 16> Protocols;
1071 for (ObjCProtocolDecl::protocol_iterator PI = PD->protocol_begin(),
1072 E = PD->protocol_end(); PI != E; ++PI)
1073 Protocols.push_back((*PI)->getNameAsString());
1074 llvm::SmallVector<llvm::Constant*, 16> InstanceMethodNames;
1075 llvm::SmallVector<llvm::Constant*, 16> InstanceMethodTypes;
1076 llvm::SmallVector<llvm::Constant*, 16> OptionalInstanceMethodNames;
1077 llvm::SmallVector<llvm::Constant*, 16> OptionalInstanceMethodTypes;
1078 for (ObjCProtocolDecl::instmeth_iterator iter = PD->instmeth_begin(),
1079 E = PD->instmeth_end(); iter != E; iter++) {
1080 std::string TypeStr;
1081 Context.getObjCEncodingForMethodDecl(*iter, TypeStr);
1082 if ((*iter)->getImplementationControl() == ObjCMethodDecl::Optional) {
1083 InstanceMethodNames.push_back(
1084 MakeConstantString((*iter)->getSelector().getAsString()));
1085 InstanceMethodTypes.push_back(MakeConstantString(TypeStr));
1087 OptionalInstanceMethodNames.push_back(
1088 MakeConstantString((*iter)->getSelector().getAsString()));
1089 OptionalInstanceMethodTypes.push_back(MakeConstantString(TypeStr));
1092 // Collect information about class methods:
1093 llvm::SmallVector<llvm::Constant*, 16> ClassMethodNames;
1094 llvm::SmallVector<llvm::Constant*, 16> ClassMethodTypes;
1095 llvm::SmallVector<llvm::Constant*, 16> OptionalClassMethodNames;
1096 llvm::SmallVector<llvm::Constant*, 16> OptionalClassMethodTypes;
1097 for (ObjCProtocolDecl::classmeth_iterator
1098 iter = PD->classmeth_begin(), endIter = PD->classmeth_end();
1099 iter != endIter ; iter++) {
1100 std::string TypeStr;
1101 Context.getObjCEncodingForMethodDecl((*iter),TypeStr);
1102 if ((*iter)->getImplementationControl() == ObjCMethodDecl::Optional) {
1103 ClassMethodNames.push_back(
1104 MakeConstantString((*iter)->getSelector().getAsString()));
1105 ClassMethodTypes.push_back(MakeConstantString(TypeStr));
1107 OptionalClassMethodNames.push_back(
1108 MakeConstantString((*iter)->getSelector().getAsString()));
1109 OptionalClassMethodTypes.push_back(MakeConstantString(TypeStr));
1113 llvm::Constant *ProtocolList = GenerateProtocolList(Protocols);
1114 llvm::Constant *InstanceMethodList =
1115 GenerateProtocolMethodList(InstanceMethodNames, InstanceMethodTypes);
1116 llvm::Constant *ClassMethodList =
1117 GenerateProtocolMethodList(ClassMethodNames, ClassMethodTypes);
1118 llvm::Constant *OptionalInstanceMethodList =
1119 GenerateProtocolMethodList(OptionalInstanceMethodNames,
1120 OptionalInstanceMethodTypes);
1121 llvm::Constant *OptionalClassMethodList =
1122 GenerateProtocolMethodList(OptionalClassMethodNames,
1123 OptionalClassMethodTypes);
1125 // Property metadata: name, attributes, isSynthesized, setter name, setter
1126 // types, getter name, getter types.
1127 // The isSynthesized value is always set to 0 in a protocol. It exists to
1128 // simplify the runtime library by allowing it to use the same data
1129 // structures for protocol metadata everywhere.
1130 llvm::StructType *PropertyMetadataTy = llvm::StructType::get(VMContext,
1131 PtrToInt8Ty, Int8Ty, Int8Ty, PtrToInt8Ty, PtrToInt8Ty, PtrToInt8Ty,
1133 std::vector<llvm::Constant*> Properties;
1134 std::vector<llvm::Constant*> OptionalProperties;
1136 // Add all of the property methods need adding to the method list and to the
1137 // property metadata list.
1138 for (ObjCContainerDecl::prop_iterator
1139 iter = PD->prop_begin(), endIter = PD->prop_end();
1140 iter != endIter ; iter++) {
1141 std::vector<llvm::Constant*> Fields;
1142 ObjCPropertyDecl *property = (*iter);
1144 Fields.push_back(MakeConstantString(property->getNameAsString()));
1145 Fields.push_back(llvm::ConstantInt::get(Int8Ty,
1146 property->getPropertyAttributes()));
1147 Fields.push_back(llvm::ConstantInt::get(Int8Ty, 0));
1148 if (ObjCMethodDecl *getter = property->getGetterMethodDecl()) {
1149 std::string TypeStr;
1150 Context.getObjCEncodingForMethodDecl(getter,TypeStr);
1151 llvm::Constant *TypeEncoding = MakeConstantString(TypeStr);
1152 InstanceMethodTypes.push_back(TypeEncoding);
1153 Fields.push_back(MakeConstantString(getter->getSelector().getAsString()));
1154 Fields.push_back(TypeEncoding);
1156 Fields.push_back(NULLPtr);
1157 Fields.push_back(NULLPtr);
1159 if (ObjCMethodDecl *setter = property->getSetterMethodDecl()) {
1160 std::string TypeStr;
1161 Context.getObjCEncodingForMethodDecl(setter,TypeStr);
1162 llvm::Constant *TypeEncoding = MakeConstantString(TypeStr);
1163 InstanceMethodTypes.push_back(TypeEncoding);
1164 Fields.push_back(MakeConstantString(setter->getSelector().getAsString()));
1165 Fields.push_back(TypeEncoding);
1167 Fields.push_back(NULLPtr);
1168 Fields.push_back(NULLPtr);
1170 if (property->getPropertyImplementation() == ObjCPropertyDecl::Optional) {
1171 OptionalProperties.push_back(llvm::ConstantStruct::get(PropertyMetadataTy, Fields));
1173 Properties.push_back(llvm::ConstantStruct::get(PropertyMetadataTy, Fields));
1176 llvm::Constant *PropertyArray = llvm::ConstantArray::get(
1177 llvm::ArrayType::get(PropertyMetadataTy, Properties.size()), Properties);
1178 llvm::Constant* PropertyListInitFields[] =
1179 {llvm::ConstantInt::get(IntTy, Properties.size()), NULLPtr, PropertyArray};
1181 llvm::Constant *PropertyListInit =
1182 llvm::ConstantStruct::get(VMContext, PropertyListInitFields, 3, false);
1183 llvm::Constant *PropertyList = new llvm::GlobalVariable(TheModule,
1184 PropertyListInit->getType(), false, llvm::GlobalValue::InternalLinkage,
1185 PropertyListInit, ".objc_property_list");
1187 llvm::Constant *OptionalPropertyArray =
1188 llvm::ConstantArray::get(llvm::ArrayType::get(PropertyMetadataTy,
1189 OptionalProperties.size()) , OptionalProperties);
1190 llvm::Constant* OptionalPropertyListInitFields[] = {
1191 llvm::ConstantInt::get(IntTy, OptionalProperties.size()), NULLPtr,
1192 OptionalPropertyArray };
1194 llvm::Constant *OptionalPropertyListInit =
1195 llvm::ConstantStruct::get(VMContext, OptionalPropertyListInitFields, 3, false);
1196 llvm::Constant *OptionalPropertyList = new llvm::GlobalVariable(TheModule,
1197 OptionalPropertyListInit->getType(), false,
1198 llvm::GlobalValue::InternalLinkage, OptionalPropertyListInit,
1199 ".objc_property_list");
1201 // Protocols are objects containing lists of the methods implemented and
1202 // protocols adopted.
1203 llvm::StructType *ProtocolTy = llvm::StructType::get(VMContext, IdTy,
1205 ProtocolList->getType(),
1206 InstanceMethodList->getType(),
1207 ClassMethodList->getType(),
1208 OptionalInstanceMethodList->getType(),
1209 OptionalClassMethodList->getType(),
1210 PropertyList->getType(),
1211 OptionalPropertyList->getType(),
1213 std::vector<llvm::Constant*> Elements;
1214 // The isa pointer must be set to a magic number so the runtime knows it's
1215 // the correct layout.
1216 int Version = CGM.getContext().getLangOptions().ObjCNonFragileABI ?
1217 NonFragileProtocolVersion : ProtocolVersion;
1218 Elements.push_back(llvm::ConstantExpr::getIntToPtr(
1219 llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), Version), IdTy));
1220 Elements.push_back(MakeConstantString(ProtocolName, ".objc_protocol_name"));
1221 Elements.push_back(ProtocolList);
1222 Elements.push_back(InstanceMethodList);
1223 Elements.push_back(ClassMethodList);
1224 Elements.push_back(OptionalInstanceMethodList);
1225 Elements.push_back(OptionalClassMethodList);
1226 Elements.push_back(PropertyList);
1227 Elements.push_back(OptionalPropertyList);
1228 ExistingProtocols[ProtocolName] =
1229 llvm::ConstantExpr::getBitCast(MakeGlobal(ProtocolTy, Elements,
1230 ".objc_protocol"), IdTy);
1232 void CGObjCGNU::GenerateProtocolHolderCategory(void) {
1233 // Collect information about instance methods
1234 llvm::SmallVector<Selector, 1> MethodSels;
1235 llvm::SmallVector<llvm::Constant*, 1> MethodTypes;
1237 std::vector<llvm::Constant*> Elements;
1238 const std::string ClassName = "__ObjC_Protocol_Holder_Ugly_Hack";
1239 const std::string CategoryName = "AnotherHack";
1240 Elements.push_back(MakeConstantString(CategoryName));
1241 Elements.push_back(MakeConstantString(ClassName));
1242 // Instance method list
1243 Elements.push_back(llvm::ConstantExpr::getBitCast(GenerateMethodList(
1244 ClassName, CategoryName, MethodSels, MethodTypes, false), PtrTy));
1245 // Class method list
1246 Elements.push_back(llvm::ConstantExpr::getBitCast(GenerateMethodList(
1247 ClassName, CategoryName, MethodSels, MethodTypes, true), PtrTy));
1249 llvm::ArrayType *ProtocolArrayTy = llvm::ArrayType::get(PtrTy,
1250 ExistingProtocols.size());
1251 llvm::StructType *ProtocolListTy = llvm::StructType::get(VMContext,
1252 PtrTy, //Should be a recurisve pointer, but it's always NULL here.
1253 LongTy,//FIXME: Should be size_t
1256 std::vector<llvm::Constant*> ProtocolElements;
1257 for (llvm::StringMapIterator<llvm::Constant*> iter =
1258 ExistingProtocols.begin(), endIter = ExistingProtocols.end();
1259 iter != endIter ; iter++) {
1260 llvm::Constant *Ptr = llvm::ConstantExpr::getBitCast(iter->getValue(),
1262 ProtocolElements.push_back(Ptr);
1264 llvm::Constant * ProtocolArray = llvm::ConstantArray::get(ProtocolArrayTy,
1266 ProtocolElements.clear();
1267 ProtocolElements.push_back(NULLPtr);
1268 ProtocolElements.push_back(llvm::ConstantInt::get(LongTy,
1269 ExistingProtocols.size()));
1270 ProtocolElements.push_back(ProtocolArray);
1271 Elements.push_back(llvm::ConstantExpr::getBitCast(MakeGlobal(ProtocolListTy,
1272 ProtocolElements, ".objc_protocol_list"), PtrTy));
1273 Categories.push_back(llvm::ConstantExpr::getBitCast(
1274 MakeGlobal(llvm::StructType::get(VMContext, PtrToInt8Ty, PtrToInt8Ty,
1275 PtrTy, PtrTy, PtrTy, NULL), Elements), PtrTy));
1278 void CGObjCGNU::GenerateCategory(const ObjCCategoryImplDecl *OCD) {
1279 std::string ClassName = OCD->getClassInterface()->getNameAsString();
1280 std::string CategoryName = OCD->getNameAsString();
1281 // Collect information about instance methods
1282 llvm::SmallVector<Selector, 16> InstanceMethodSels;
1283 llvm::SmallVector<llvm::Constant*, 16> InstanceMethodTypes;
1284 for (ObjCCategoryImplDecl::instmeth_iterator
1285 iter = OCD->instmeth_begin(), endIter = OCD->instmeth_end();
1286 iter != endIter ; iter++) {
1287 InstanceMethodSels.push_back((*iter)->getSelector());
1288 std::string TypeStr;
1289 CGM.getContext().getObjCEncodingForMethodDecl(*iter,TypeStr);
1290 InstanceMethodTypes.push_back(MakeConstantString(TypeStr));
1293 // Collect information about class methods
1294 llvm::SmallVector<Selector, 16> ClassMethodSels;
1295 llvm::SmallVector<llvm::Constant*, 16> ClassMethodTypes;
1296 for (ObjCCategoryImplDecl::classmeth_iterator
1297 iter = OCD->classmeth_begin(), endIter = OCD->classmeth_end();
1298 iter != endIter ; iter++) {
1299 ClassMethodSels.push_back((*iter)->getSelector());
1300 std::string TypeStr;
1301 CGM.getContext().getObjCEncodingForMethodDecl(*iter,TypeStr);
1302 ClassMethodTypes.push_back(MakeConstantString(TypeStr));
1305 // Collect the names of referenced protocols
1306 llvm::SmallVector<std::string, 16> Protocols;
1307 const ObjCCategoryDecl *CatDecl = OCD->getCategoryDecl();
1308 const ObjCList<ObjCProtocolDecl> &Protos = CatDecl->getReferencedProtocols();
1309 for (ObjCList<ObjCProtocolDecl>::iterator I = Protos.begin(),
1310 E = Protos.end(); I != E; ++I)
1311 Protocols.push_back((*I)->getNameAsString());
1313 std::vector<llvm::Constant*> Elements;
1314 Elements.push_back(MakeConstantString(CategoryName));
1315 Elements.push_back(MakeConstantString(ClassName));
1316 // Instance method list
1317 Elements.push_back(llvm::ConstantExpr::getBitCast(GenerateMethodList(
1318 ClassName, CategoryName, InstanceMethodSels, InstanceMethodTypes,
1320 // Class method list
1321 Elements.push_back(llvm::ConstantExpr::getBitCast(GenerateMethodList(
1322 ClassName, CategoryName, ClassMethodSels, ClassMethodTypes, true),
1325 Elements.push_back(llvm::ConstantExpr::getBitCast(
1326 GenerateProtocolList(Protocols), PtrTy));
1327 Categories.push_back(llvm::ConstantExpr::getBitCast(
1328 MakeGlobal(llvm::StructType::get(VMContext, PtrToInt8Ty, PtrToInt8Ty,
1329 PtrTy, PtrTy, PtrTy, NULL), Elements), PtrTy));
1332 llvm::Constant *CGObjCGNU::GeneratePropertyList(const ObjCImplementationDecl *OID,
1333 llvm::SmallVectorImpl<Selector> &InstanceMethodSels,
1334 llvm::SmallVectorImpl<llvm::Constant*> &InstanceMethodTypes) {
1335 ASTContext &Context = CGM.getContext();
1337 // Property metadata: name, attributes, isSynthesized, setter name, setter
1338 // types, getter name, getter types.
1339 llvm::StructType *PropertyMetadataTy = llvm::StructType::get(VMContext,
1340 PtrToInt8Ty, Int8Ty, Int8Ty, PtrToInt8Ty, PtrToInt8Ty, PtrToInt8Ty,
1342 std::vector<llvm::Constant*> Properties;
1345 // Add all of the property methods need adding to the method list and to the
1346 // property metadata list.
1347 for (ObjCImplDecl::propimpl_iterator
1348 iter = OID->propimpl_begin(), endIter = OID->propimpl_end();
1349 iter != endIter ; iter++) {
1350 std::vector<llvm::Constant*> Fields;
1351 ObjCPropertyDecl *property = (*iter)->getPropertyDecl();
1352 ObjCPropertyImplDecl *propertyImpl = *iter;
1353 bool isSynthesized = (propertyImpl->getPropertyImplementation() ==
1354 ObjCPropertyImplDecl::Synthesize);
1356 Fields.push_back(MakeConstantString(property->getNameAsString()));
1357 Fields.push_back(llvm::ConstantInt::get(Int8Ty,
1358 property->getPropertyAttributes()));
1359 Fields.push_back(llvm::ConstantInt::get(Int8Ty, isSynthesized));
1360 if (ObjCMethodDecl *getter = property->getGetterMethodDecl()) {
1361 std::string TypeStr;
1362 Context.getObjCEncodingForMethodDecl(getter,TypeStr);
1363 llvm::Constant *TypeEncoding = MakeConstantString(TypeStr);
1364 if (isSynthesized) {
1365 InstanceMethodTypes.push_back(TypeEncoding);
1366 InstanceMethodSels.push_back(getter->getSelector());
1368 Fields.push_back(MakeConstantString(getter->getSelector().getAsString()));
1369 Fields.push_back(TypeEncoding);
1371 Fields.push_back(NULLPtr);
1372 Fields.push_back(NULLPtr);
1374 if (ObjCMethodDecl *setter = property->getSetterMethodDecl()) {
1375 std::string TypeStr;
1376 Context.getObjCEncodingForMethodDecl(setter,TypeStr);
1377 llvm::Constant *TypeEncoding = MakeConstantString(TypeStr);
1378 if (isSynthesized) {
1379 InstanceMethodTypes.push_back(TypeEncoding);
1380 InstanceMethodSels.push_back(setter->getSelector());
1382 Fields.push_back(MakeConstantString(setter->getSelector().getAsString()));
1383 Fields.push_back(TypeEncoding);
1385 Fields.push_back(NULLPtr);
1386 Fields.push_back(NULLPtr);
1388 Properties.push_back(llvm::ConstantStruct::get(PropertyMetadataTy, Fields));
1390 llvm::ArrayType *PropertyArrayTy =
1391 llvm::ArrayType::get(PropertyMetadataTy, Properties.size());
1392 llvm::Constant *PropertyArray = llvm::ConstantArray::get(PropertyArrayTy,
1394 llvm::Constant* PropertyListInitFields[] =
1395 {llvm::ConstantInt::get(IntTy, Properties.size()), NULLPtr, PropertyArray};
1397 llvm::Constant *PropertyListInit =
1398 llvm::ConstantStruct::get(VMContext, PropertyListInitFields, 3, false);
1399 return new llvm::GlobalVariable(TheModule, PropertyListInit->getType(), false,
1400 llvm::GlobalValue::InternalLinkage, PropertyListInit,
1401 ".objc_property_list");
1404 void CGObjCGNU::GenerateClass(const ObjCImplementationDecl *OID) {
1405 ASTContext &Context = CGM.getContext();
1407 // Get the superclass name.
1408 const ObjCInterfaceDecl * SuperClassDecl =
1409 OID->getClassInterface()->getSuperClass();
1410 std::string SuperClassName;
1411 if (SuperClassDecl) {
1412 SuperClassName = SuperClassDecl->getNameAsString();
1413 EmitClassRef(SuperClassName);
1416 // Get the class name
1417 ObjCInterfaceDecl *ClassDecl =
1418 const_cast<ObjCInterfaceDecl *>(OID->getClassInterface());
1419 std::string ClassName = ClassDecl->getNameAsString();
1420 // Emit the symbol that is used to generate linker errors if this class is
1421 // referenced in other modules but not declared.
1422 std::string classSymbolName = "__objc_class_name_" + ClassName;
1423 if (llvm::GlobalVariable *symbol =
1424 TheModule.getGlobalVariable(classSymbolName)) {
1425 symbol->setInitializer(llvm::ConstantInt::get(LongTy, 0));
1427 new llvm::GlobalVariable(TheModule, LongTy, false,
1428 llvm::GlobalValue::ExternalLinkage, llvm::ConstantInt::get(LongTy, 0),
1432 // Get the size of instances.
1433 int instanceSize = Context.getASTObjCImplementationLayout(OID).getSize() / 8;
1435 // Collect information about instance variables.
1436 llvm::SmallVector<llvm::Constant*, 16> IvarNames;
1437 llvm::SmallVector<llvm::Constant*, 16> IvarTypes;
1438 llvm::SmallVector<llvm::Constant*, 16> IvarOffsets;
1440 std::vector<llvm::Constant*> IvarOffsetValues;
1442 int superInstanceSize = !SuperClassDecl ? 0 :
1443 Context.getASTObjCInterfaceLayout(SuperClassDecl).getSize() / 8;
1444 // For non-fragile ivars, set the instance size to 0 - {the size of just this
1445 // class}. The runtime will then set this to the correct value on load.
1446 if (CGM.getContext().getLangOptions().ObjCNonFragileABI) {
1447 instanceSize = 0 - (instanceSize - superInstanceSize);
1450 // Collect declared and synthesized ivars.
1451 llvm::SmallVector<ObjCIvarDecl*, 16> OIvars;
1452 CGM.getContext().ShallowCollectObjCIvars(ClassDecl, OIvars);
1454 for (unsigned i = 0, e = OIvars.size(); i != e; ++i) {
1455 ObjCIvarDecl *IVD = OIvars[i];
1457 IvarNames.push_back(MakeConstantString(IVD->getNameAsString()));
1458 // Get the type encoding for this ivar
1459 std::string TypeStr;
1460 Context.getObjCEncodingForType(IVD->getType(), TypeStr);
1461 IvarTypes.push_back(MakeConstantString(TypeStr));
1463 uint64_t BaseOffset = ComputeIvarBaseOffset(CGM, OID, IVD);
1464 uint64_t Offset = BaseOffset;
1465 if (CGM.getContext().getLangOptions().ObjCNonFragileABI) {
1466 Offset = BaseOffset - superInstanceSize;
1468 IvarOffsets.push_back(
1469 llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), Offset));
1470 IvarOffsetValues.push_back(new llvm::GlobalVariable(TheModule, IntTy,
1471 false, llvm::GlobalValue::ExternalLinkage,
1472 llvm::ConstantInt::get(IntTy, BaseOffset),
1473 "__objc_ivar_offset_value_" + ClassName +"." +
1474 IVD->getNameAsString()));
1476 llvm::Constant *IvarOffsetArrayInit =
1477 llvm::ConstantArray::get(llvm::ArrayType::get(PtrToIntTy,
1478 IvarOffsetValues.size()), IvarOffsetValues);
1479 llvm::GlobalVariable *IvarOffsetArray = new llvm::GlobalVariable(TheModule,
1480 IvarOffsetArrayInit->getType(), false,
1481 llvm::GlobalValue::InternalLinkage, IvarOffsetArrayInit,
1484 // Collect information about instance methods
1485 llvm::SmallVector<Selector, 16> InstanceMethodSels;
1486 llvm::SmallVector<llvm::Constant*, 16> InstanceMethodTypes;
1487 for (ObjCImplementationDecl::instmeth_iterator
1488 iter = OID->instmeth_begin(), endIter = OID->instmeth_end();
1489 iter != endIter ; iter++) {
1490 InstanceMethodSels.push_back((*iter)->getSelector());
1491 std::string TypeStr;
1492 Context.getObjCEncodingForMethodDecl((*iter),TypeStr);
1493 InstanceMethodTypes.push_back(MakeConstantString(TypeStr));
1496 llvm::Constant *Properties = GeneratePropertyList(OID, InstanceMethodSels,
1497 InstanceMethodTypes);
1500 // Collect information about class methods
1501 llvm::SmallVector<Selector, 16> ClassMethodSels;
1502 llvm::SmallVector<llvm::Constant*, 16> ClassMethodTypes;
1503 for (ObjCImplementationDecl::classmeth_iterator
1504 iter = OID->classmeth_begin(), endIter = OID->classmeth_end();
1505 iter != endIter ; iter++) {
1506 ClassMethodSels.push_back((*iter)->getSelector());
1507 std::string TypeStr;
1508 Context.getObjCEncodingForMethodDecl((*iter),TypeStr);
1509 ClassMethodTypes.push_back(MakeConstantString(TypeStr));
1511 // Collect the names of referenced protocols
1512 llvm::SmallVector<std::string, 16> Protocols;
1513 const ObjCList<ObjCProtocolDecl> &Protos =ClassDecl->getReferencedProtocols();
1514 for (ObjCList<ObjCProtocolDecl>::iterator I = Protos.begin(),
1515 E = Protos.end(); I != E; ++I)
1516 Protocols.push_back((*I)->getNameAsString());
1520 // Get the superclass pointer.
1521 llvm::Constant *SuperClass;
1522 if (!SuperClassName.empty()) {
1523 SuperClass = MakeConstantString(SuperClassName, ".super_class_name");
1525 SuperClass = llvm::ConstantPointerNull::get(PtrToInt8Ty);
1527 // Empty vector used to construct empty method lists
1528 llvm::SmallVector<llvm::Constant*, 1> empty;
1529 // Generate the method and instance variable lists
1530 llvm::Constant *MethodList = GenerateMethodList(ClassName, "",
1531 InstanceMethodSels, InstanceMethodTypes, false);
1532 llvm::Constant *ClassMethodList = GenerateMethodList(ClassName, "",
1533 ClassMethodSels, ClassMethodTypes, true);
1534 llvm::Constant *IvarList = GenerateIvarList(IvarNames, IvarTypes,
1536 // Irrespective of whether we are compiling for a fragile or non-fragile ABI,
1537 // we emit a symbol containing the offset for each ivar in the class. This
1538 // allows code compiled for the non-Fragile ABI to inherit from code compiled
1539 // for the legacy ABI, without causing problems. The converse is also
1540 // possible, but causes all ivar accesses to be fragile.
1542 // Offset pointer for getting at the correct field in the ivar list when
1543 // setting up the alias. These are: The base address for the global, the
1544 // ivar array (second field), the ivar in this list (set for each ivar), and
1545 // the offset (third field in ivar structure)
1546 const llvm::Type *IndexTy = llvm::Type::getInt32Ty(VMContext);
1547 llvm::Constant *offsetPointerIndexes[] = {Zeros[0],
1548 llvm::ConstantInt::get(IndexTy, 1), 0,
1549 llvm::ConstantInt::get(IndexTy, 2) };
1551 for (ObjCInterfaceDecl::ivar_iterator iter = ClassDecl->ivar_begin(),
1552 endIter = ClassDecl->ivar_end() ; iter != endIter ; iter++) {
1553 const std::string Name = "__objc_ivar_offset_" + ClassName + '.'
1554 +(*iter)->getNameAsString();
1555 offsetPointerIndexes[2] = llvm::ConstantInt::get(IndexTy, i++);
1556 // Get the correct ivar field
1557 llvm::Constant *offsetValue = llvm::ConstantExpr::getGetElementPtr(
1558 IvarList, offsetPointerIndexes, 4);
1559 // Get the existing alias, if one exists.
1560 llvm::GlobalVariable *offset = TheModule.getNamedGlobal(Name);
1562 offset->setInitializer(offsetValue);
1563 // If this is the real definition, change its linkage type so that
1564 // different modules will use this one, rather than their private
1566 offset->setLinkage(llvm::GlobalValue::ExternalLinkage);
1568 // Add a new alias if there isn't one already.
1569 offset = new llvm::GlobalVariable(TheModule, offsetValue->getType(),
1570 false, llvm::GlobalValue::ExternalLinkage, offsetValue, Name);
1573 //Generate metaclass for class methods
1574 llvm::Constant *MetaClassStruct = GenerateClassStructure(NULLPtr,
1575 NULLPtr, 0x12L, ClassName.c_str(), 0, Zeros[0], GenerateIvarList(
1576 empty, empty, empty), ClassMethodList, NULLPtr, NULLPtr, NULLPtr, true);
1578 // Generate the class structure
1579 llvm::Constant *ClassStruct =
1580 GenerateClassStructure(MetaClassStruct, SuperClass, 0x11L,
1581 ClassName.c_str(), 0,
1582 llvm::ConstantInt::get(LongTy, instanceSize), IvarList,
1583 MethodList, GenerateProtocolList(Protocols), IvarOffsetArray,
1586 // Resolve the class aliases, if they exist.
1587 if (ClassPtrAlias) {
1588 ClassPtrAlias->setAliasee(
1589 llvm::ConstantExpr::getBitCast(ClassStruct, IdTy));
1592 if (MetaClassPtrAlias) {
1593 MetaClassPtrAlias->setAliasee(
1594 llvm::ConstantExpr::getBitCast(MetaClassStruct, IdTy));
1595 MetaClassPtrAlias = 0;
1598 // Add class structure to list to be added to the symtab later
1599 ClassStruct = llvm::ConstantExpr::getBitCast(ClassStruct, PtrToInt8Ty);
1600 Classes.push_back(ClassStruct);
1604 llvm::Function *CGObjCGNU::ModuleInitFunction() {
1605 // Only emit an ObjC load function if no Objective-C stuff has been called
1606 if (Classes.empty() && Categories.empty() && ConstantStrings.empty() &&
1607 ExistingProtocols.empty() && TypedSelectors.empty() &&
1608 UntypedSelectors.empty())
1611 // Add all referenced protocols to a category.
1612 GenerateProtocolHolderCategory();
1614 const llvm::StructType *SelStructTy = dyn_cast<llvm::StructType>(
1615 SelectorTy->getElementType());
1616 const llvm::Type *SelStructPtrTy = SelectorTy;
1617 bool isSelOpaque = false;
1618 if (SelStructTy == 0) {
1619 SelStructTy = llvm::StructType::get(VMContext, PtrToInt8Ty,
1621 SelStructPtrTy = llvm::PointerType::getUnqual(SelStructTy);
1625 // Name the ObjC types to make the IR a bit easier to read
1626 TheModule.addTypeName(".objc_selector", SelStructPtrTy);
1627 TheModule.addTypeName(".objc_id", IdTy);
1628 TheModule.addTypeName(".objc_imp", IMPTy);
1630 std::vector<llvm::Constant*> Elements;
1631 llvm::Constant *Statics = NULLPtr;
1632 // Generate statics list:
1633 if (ConstantStrings.size()) {
1634 llvm::ArrayType *StaticsArrayTy = llvm::ArrayType::get(PtrToInt8Ty,
1635 ConstantStrings.size() + 1);
1636 ConstantStrings.push_back(NULLPtr);
1638 llvm::StringRef StringClass = CGM.getLangOptions().ObjCConstantStringClass;
1639 if (StringClass.empty()) StringClass = "NXConstantString";
1640 Elements.push_back(MakeConstantString(StringClass,
1641 ".objc_static_class_name"));
1642 Elements.push_back(llvm::ConstantArray::get(StaticsArrayTy,
1644 llvm::StructType *StaticsListTy =
1645 llvm::StructType::get(VMContext, PtrToInt8Ty, StaticsArrayTy, NULL);
1646 llvm::Type *StaticsListPtrTy =
1647 llvm::PointerType::getUnqual(StaticsListTy);
1648 Statics = MakeGlobal(StaticsListTy, Elements, ".objc_statics");
1649 llvm::ArrayType *StaticsListArrayTy =
1650 llvm::ArrayType::get(StaticsListPtrTy, 2);
1652 Elements.push_back(Statics);
1653 Elements.push_back(llvm::Constant::getNullValue(StaticsListPtrTy));
1654 Statics = MakeGlobal(StaticsListArrayTy, Elements, ".objc_statics_ptr");
1655 Statics = llvm::ConstantExpr::getBitCast(Statics, PtrTy);
1657 // Array of classes, categories, and constant objects
1658 llvm::ArrayType *ClassListTy = llvm::ArrayType::get(PtrToInt8Ty,
1659 Classes.size() + Categories.size() + 2);
1660 llvm::StructType *SymTabTy = llvm::StructType::get(VMContext,
1661 LongTy, SelStructPtrTy,
1662 llvm::Type::getInt16Ty(VMContext),
1663 llvm::Type::getInt16Ty(VMContext),
1667 // Pointer to an array of selectors used in this module.
1668 std::vector<llvm::Constant*> Selectors;
1669 for (std::map<TypedSelector, llvm::GlobalAlias*>::iterator
1670 iter = TypedSelectors.begin(), iterEnd = TypedSelectors.end();
1671 iter != iterEnd ; ++iter) {
1672 Elements.push_back(ExportUniqueString(iter->first.first, ".objc_sel_name"));
1673 Elements.push_back(MakeConstantString(iter->first.second,
1674 ".objc_sel_types"));
1675 Selectors.push_back(llvm::ConstantStruct::get(SelStructTy, Elements));
1678 for (llvm::StringMap<llvm::GlobalAlias*>::iterator
1679 iter = UntypedSelectors.begin(), iterEnd = UntypedSelectors.end();
1680 iter != iterEnd; ++iter) {
1682 ExportUniqueString(iter->getKeyData(), ".objc_sel_name"));
1683 Elements.push_back(NULLPtr);
1684 Selectors.push_back(llvm::ConstantStruct::get(SelStructTy, Elements));
1687 Elements.push_back(NULLPtr);
1688 Elements.push_back(NULLPtr);
1689 Selectors.push_back(llvm::ConstantStruct::get(SelStructTy, Elements));
1691 // Number of static selectors
1692 Elements.push_back(llvm::ConstantInt::get(LongTy, Selectors.size() ));
1693 llvm::Constant *SelectorList = MakeGlobal(
1694 llvm::ArrayType::get(SelStructTy, Selectors.size()), Selectors,
1695 ".objc_selector_list");
1696 Elements.push_back(llvm::ConstantExpr::getBitCast(SelectorList,
1699 // Now that all of the static selectors exist, create pointers to them.
1701 for (std::map<TypedSelector, llvm::GlobalAlias*>::iterator
1702 iter=TypedSelectors.begin(), iterEnd =TypedSelectors.end();
1703 iter != iterEnd; ++iter) {
1704 llvm::Constant *Idxs[] = {Zeros[0],
1705 llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), index++), Zeros[0]};
1706 llvm::Constant *SelPtr = new llvm::GlobalVariable(TheModule, SelStructPtrTy,
1707 true, llvm::GlobalValue::LinkOnceODRLinkage,
1708 llvm::ConstantExpr::getGetElementPtr(SelectorList, Idxs, 2),
1709 MangleSelectorTypes(".objc_sel_ptr"+iter->first.first+"."+
1710 iter->first.second));
1711 // If selectors are defined as an opaque type, cast the pointer to this
1714 SelPtr = llvm::ConstantExpr::getBitCast(SelPtr,
1715 llvm::PointerType::getUnqual(SelectorTy));
1717 (*iter).second->replaceAllUsesWith(SelPtr);
1718 (*iter).second->eraseFromParent();
1720 for (llvm::StringMap<llvm::GlobalAlias*>::iterator
1721 iter=UntypedSelectors.begin(), iterEnd = UntypedSelectors.end();
1722 iter != iterEnd; iter++) {
1723 llvm::Constant *Idxs[] = {Zeros[0],
1724 llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), index++), Zeros[0]};
1725 llvm::Constant *SelPtr = new llvm::GlobalVariable(TheModule, SelStructPtrTy,
1726 true, llvm::GlobalValue::LinkOnceODRLinkage,
1727 llvm::ConstantExpr::getGetElementPtr(SelectorList, Idxs, 2),
1728 MangleSelectorTypes(std::string(".objc_sel_ptr")+iter->getKey().str()));
1729 // If selectors are defined as an opaque type, cast the pointer to this
1732 SelPtr = llvm::ConstantExpr::getBitCast(SelPtr,
1733 llvm::PointerType::getUnqual(SelectorTy));
1735 (*iter).second->replaceAllUsesWith(SelPtr);
1736 (*iter).second->eraseFromParent();
1738 // Number of classes defined.
1739 Elements.push_back(llvm::ConstantInt::get(llvm::Type::getInt16Ty(VMContext),
1741 // Number of categories defined
1742 Elements.push_back(llvm::ConstantInt::get(llvm::Type::getInt16Ty(VMContext),
1743 Categories.size()));
1744 // Create an array of classes, then categories, then static object instances
1745 Classes.insert(Classes.end(), Categories.begin(), Categories.end());
1746 // NULL-terminated list of static object instances (mainly constant strings)
1747 Classes.push_back(Statics);
1748 Classes.push_back(NULLPtr);
1749 llvm::Constant *ClassList = llvm::ConstantArray::get(ClassListTy, Classes);
1750 Elements.push_back(ClassList);
1751 // Construct the symbol table
1752 llvm::Constant *SymTab= MakeGlobal(SymTabTy, Elements);
1754 // The symbol table is contained in a module which has some version-checking
1756 llvm::StructType * ModuleTy = llvm::StructType::get(VMContext, LongTy, LongTy,
1757 PtrToInt8Ty, llvm::PointerType::getUnqual(SymTabTy), NULL);
1759 // Runtime version used for compatibility checking.
1760 if (CGM.getContext().getLangOptions().ObjCNonFragileABI) {
1761 Elements.push_back(llvm::ConstantInt::get(LongTy,
1762 NonFragileRuntimeVersion));
1764 Elements.push_back(llvm::ConstantInt::get(LongTy, RuntimeVersion));
1767 llvm::TargetData td(&TheModule);
1768 Elements.push_back(llvm::ConstantInt::get(LongTy,
1769 td.getTypeSizeInBits(ModuleTy)/8));
1770 //FIXME: Should be the path to the file where this module was declared
1771 Elements.push_back(NULLPtr);
1772 Elements.push_back(SymTab);
1773 llvm::Value *Module = MakeGlobal(ModuleTy, Elements);
1775 // Create the load function calling the runtime entry point with the module
1777 llvm::Function * LoadFunction = llvm::Function::Create(
1778 llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), false),
1779 llvm::GlobalValue::InternalLinkage, ".objc_load_function",
1781 llvm::BasicBlock *EntryBB =
1782 llvm::BasicBlock::Create(VMContext, "entry", LoadFunction);
1783 CGBuilderTy Builder(VMContext);
1784 Builder.SetInsertPoint(EntryBB);
1786 std::vector<const llvm::Type*> Params(1,
1787 llvm::PointerType::getUnqual(ModuleTy));
1788 llvm::Value *Register = CGM.CreateRuntimeFunction(llvm::FunctionType::get(
1789 llvm::Type::getVoidTy(VMContext), Params, true), "__objc_exec_class");
1790 Builder.CreateCall(Register, Module);
1791 Builder.CreateRetVoid();
1793 return LoadFunction;
1796 llvm::Function *CGObjCGNU::GenerateMethod(const ObjCMethodDecl *OMD,
1797 const ObjCContainerDecl *CD) {
1798 const ObjCCategoryImplDecl *OCD =
1799 dyn_cast<ObjCCategoryImplDecl>(OMD->getDeclContext());
1800 std::string CategoryName = OCD ? OCD->getNameAsString() : "";
1801 std::string ClassName = CD->getName();
1802 std::string MethodName = OMD->getSelector().getAsString();
1803 bool isClassMethod = !OMD->isInstanceMethod();
1805 CodeGenTypes &Types = CGM.getTypes();
1806 const llvm::FunctionType *MethodTy =
1807 Types.GetFunctionType(Types.getFunctionInfo(OMD), OMD->isVariadic());
1808 std::string FunctionName = SymbolNameForMethod(ClassName, CategoryName,
1809 MethodName, isClassMethod);
1811 llvm::Function *Method
1812 = llvm::Function::Create(MethodTy,
1813 llvm::GlobalValue::InternalLinkage,
1819 llvm::Function *CGObjCGNU::GetPropertyGetFunction() {
1820 std::vector<const llvm::Type*> Params;
1821 const llvm::Type *BoolTy =
1822 CGM.getTypes().ConvertType(CGM.getContext().BoolTy);
1823 Params.push_back(IdTy);
1824 Params.push_back(SelectorTy);
1825 Params.push_back(IntTy);
1826 Params.push_back(BoolTy);
1827 // void objc_getProperty (id, SEL, int, bool)
1828 const llvm::FunctionType *FTy =
1829 llvm::FunctionType::get(IdTy, Params, false);
1830 return cast<llvm::Function>(CGM.CreateRuntimeFunction(FTy,
1831 "objc_getProperty"));
1834 llvm::Function *CGObjCGNU::GetPropertySetFunction() {
1835 std::vector<const llvm::Type*> Params;
1836 const llvm::Type *BoolTy =
1837 CGM.getTypes().ConvertType(CGM.getContext().BoolTy);
1838 Params.push_back(IdTy);
1839 Params.push_back(SelectorTy);
1840 Params.push_back(IntTy);
1841 Params.push_back(IdTy);
1842 Params.push_back(BoolTy);
1843 Params.push_back(BoolTy);
1844 // void objc_setProperty (id, SEL, int, id, bool, bool)
1845 const llvm::FunctionType *FTy =
1846 llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), Params, false);
1847 return cast<llvm::Function>(CGM.CreateRuntimeFunction(FTy,
1848 "objc_setProperty"));
1851 // FIXME. Implement this.
1852 llvm::Function *CGObjCGNU::GetCopyStructFunction() {
1856 llvm::Constant *CGObjCGNU::EnumerationMutationFunction() {
1857 CodeGen::CodeGenTypes &Types = CGM.getTypes();
1858 ASTContext &Ctx = CGM.getContext();
1859 // void objc_enumerationMutation (id)
1860 llvm::SmallVector<CanQualType,1> Params;
1861 Params.push_back(ASTIdTy);
1862 const llvm::FunctionType *FTy =
1863 Types.GetFunctionType(Types.getFunctionInfo(Ctx.VoidTy, Params,
1864 FunctionType::ExtInfo()), false);
1865 return CGM.CreateRuntimeFunction(FTy, "objc_enumerationMutation");
1869 struct CallSyncExit : EHScopeStack::Cleanup {
1870 llvm::Value *SyncExitFn;
1871 llvm::Value *SyncArg;
1872 CallSyncExit(llvm::Value *SyncExitFn, llvm::Value *SyncArg)
1873 : SyncExitFn(SyncExitFn), SyncArg(SyncArg) {}
1875 void Emit(CodeGenFunction &CGF, bool IsForEHCleanup) {
1876 CGF.Builder.CreateCall(SyncExitFn, SyncArg)->setDoesNotThrow();
1881 void CGObjCGNU::EmitSynchronizedStmt(CodeGen::CodeGenFunction &CGF,
1882 const ObjCAtSynchronizedStmt &S) {
1883 std::vector<const llvm::Type*> Args(1, IdTy);
1884 llvm::FunctionType *FTy =
1885 llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), Args, false);
1887 // Evaluate the lock operand. This should dominate the cleanup.
1888 llvm::Value *SyncArg =
1889 CGF.EmitScalarExpr(S.getSynchExpr());
1891 // Acquire the lock.
1892 llvm::Value *SyncEnter = CGM.CreateRuntimeFunction(FTy, "objc_sync_enter");
1893 SyncArg = CGF.Builder.CreateBitCast(SyncArg, IdTy);
1894 CGF.Builder.CreateCall(SyncEnter, SyncArg);
1896 // Register an all-paths cleanup to release the lock.
1897 llvm::Value *SyncExit = CGM.CreateRuntimeFunction(FTy, "objc_sync_exit");
1898 CGF.EHStack.pushCleanup<CallSyncExit>(NormalAndEHCleanup, SyncExit, SyncArg);
1900 // Emit the body of the statement.
1901 CGF.EmitStmt(S.getSynchBody());
1903 // Pop the lock-release cleanup.
1904 CGF.PopCleanupBlock();
1908 struct CatchHandler {
1909 const VarDecl *Variable;
1911 llvm::BasicBlock *Block;
1912 llvm::Value *TypeInfo;
1916 void CGObjCGNU::EmitTryStmt(CodeGen::CodeGenFunction &CGF,
1917 const ObjCAtTryStmt &S) {
1918 // Unlike the Apple non-fragile runtimes, which also uses
1919 // unwind-based zero cost exceptions, the GNU Objective C runtime's
1920 // EH support isn't a veneer over C++ EH. Instead, exception
1921 // objects are created by __objc_exception_throw and destroyed by
1922 // the personality function; this avoids the need for bracketing
1923 // catch handlers with calls to __blah_begin_catch/__blah_end_catch
1924 // (or even _Unwind_DeleteException), but probably doesn't
1925 // interoperate very well with foreign exceptions.
1927 // Jump destination for falling out of catch bodies.
1928 CodeGenFunction::JumpDest Cont;
1929 if (S.getNumCatchStmts())
1930 Cont = CGF.getJumpDestInCurrentScope("eh.cont");
1932 // We handle @finally statements by pushing them as a cleanup
1933 // before entering the catch.
1934 CodeGenFunction::FinallyInfo FinallyInfo;
1935 if (const ObjCAtFinallyStmt *Finally = S.getFinallyStmt()) {
1936 std::vector<const llvm::Type*> Args(1, IdTy);
1937 llvm::FunctionType *FTy =
1938 llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), Args, false);
1939 llvm::Constant *Rethrow =
1940 CGM.CreateRuntimeFunction(FTy, "objc_exception_throw");
1942 FinallyInfo = CGF.EnterFinallyBlock(Finally->getFinallyBody(), 0, 0,
1946 llvm::SmallVector<CatchHandler, 8> Handlers;
1948 // Enter the catch, if there is one.
1949 if (S.getNumCatchStmts()) {
1950 for (unsigned I = 0, N = S.getNumCatchStmts(); I != N; ++I) {
1951 const ObjCAtCatchStmt *CatchStmt = S.getCatchStmt(I);
1952 const VarDecl *CatchDecl = CatchStmt->getCatchParamDecl();
1954 Handlers.push_back(CatchHandler());
1955 CatchHandler &Handler = Handlers.back();
1956 Handler.Variable = CatchDecl;
1957 Handler.Body = CatchStmt->getCatchBody();
1958 Handler.Block = CGF.createBasicBlock("catch");
1960 // @catch() and @catch(id) both catch any ObjC exception.
1961 // Treat them as catch-alls.
1962 // FIXME: this is what this code was doing before, but should 'id'
1963 // really be catching foreign exceptions?
1965 || CatchDecl->getType()->isObjCIdType()
1966 || CatchDecl->getType()->isObjCQualifiedIdType()) {
1968 Handler.TypeInfo = 0; // catch-all
1970 // Don't consider any other catches.
1974 // All other types should be Objective-C interface pointer types.
1975 const ObjCObjectPointerType *OPT =
1976 CatchDecl->getType()->getAs<ObjCObjectPointerType>();
1977 assert(OPT && "Invalid @catch type.");
1978 const ObjCInterfaceDecl *IDecl =
1979 OPT->getObjectType()->getInterface();
1980 assert(IDecl && "Invalid @catch type.");
1981 Handler.TypeInfo = MakeConstantString(IDecl->getNameAsString());
1984 EHCatchScope *Catch = CGF.EHStack.pushCatch(Handlers.size());
1985 for (unsigned I = 0, E = Handlers.size(); I != E; ++I)
1986 Catch->setHandler(I, Handlers[I].TypeInfo, Handlers[I].Block);
1989 // Emit the try body.
1990 CGF.EmitStmt(S.getTryBody());
1993 if (S.getNumCatchStmts())
1994 CGF.EHStack.popCatch();
1996 // Remember where we were.
1997 CGBuilderTy::InsertPoint SavedIP = CGF.Builder.saveAndClearIP();
1999 // Emit the handlers.
2000 for (unsigned I = 0, E = Handlers.size(); I != E; ++I) {
2001 CatchHandler &Handler = Handlers[I];
2002 CGF.EmitBlock(Handler.Block);
2004 llvm::Value *Exn = CGF.Builder.CreateLoad(CGF.getExceptionSlot());
2006 // Bind the catch parameter if it exists.
2007 if (const VarDecl *CatchParam = Handler.Variable) {
2008 const llvm::Type *CatchType = CGF.ConvertType(CatchParam->getType());
2009 Exn = CGF.Builder.CreateBitCast(Exn, CatchType);
2011 CGF.EmitLocalBlockVarDecl(*CatchParam);
2012 CGF.Builder.CreateStore(Exn, CGF.GetAddrOfLocalVar(CatchParam));
2015 CGF.ObjCEHValueStack.push_back(Exn);
2016 CGF.EmitStmt(Handler.Body);
2017 CGF.ObjCEHValueStack.pop_back();
2019 CGF.EmitBranchThroughCleanup(Cont);
2022 // Go back to the try-statement fallthrough.
2023 CGF.Builder.restoreIP(SavedIP);
2025 // Pop out of the finally.
2026 if (S.getFinallyStmt())
2027 CGF.ExitFinallyBlock(FinallyInfo);
2029 if (Cont.isValid()) {
2030 if (Cont.getBlock()->use_empty())
2031 delete Cont.getBlock();
2033 CGF.EmitBlock(Cont.getBlock());
2037 void CGObjCGNU::EmitThrowStmt(CodeGen::CodeGenFunction &CGF,
2038 const ObjCAtThrowStmt &S) {
2039 llvm::Value *ExceptionAsObject;
2041 std::vector<const llvm::Type*> Args(1, IdTy);
2042 llvm::FunctionType *FTy =
2043 llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), Args, false);
2044 llvm::Value *ThrowFn =
2045 CGM.CreateRuntimeFunction(FTy, "objc_exception_throw");
2047 if (const Expr *ThrowExpr = S.getThrowExpr()) {
2048 llvm::Value *Exception = CGF.EmitScalarExpr(ThrowExpr);
2049 ExceptionAsObject = Exception;
2051 assert((!CGF.ObjCEHValueStack.empty() && CGF.ObjCEHValueStack.back()) &&
2052 "Unexpected rethrow outside @catch block.");
2053 ExceptionAsObject = CGF.ObjCEHValueStack.back();
2056 CGF.Builder.CreateBitCast(ExceptionAsObject, IdTy, "tmp");
2058 // Note: This may have to be an invoke, if we want to support constructs like:
2064 // This is effectively turning @throw into an incredibly-expensive goto, but
2065 // it may happen as a result of inlining followed by missed optimizations, or
2066 // as a result of stupidity.
2067 llvm::BasicBlock *UnwindBB = CGF.getInvokeDest();
2069 CGF.Builder.CreateCall(ThrowFn, ExceptionAsObject);
2070 CGF.Builder.CreateUnreachable();
2072 CGF.Builder.CreateInvoke(ThrowFn, UnwindBB, UnwindBB, &ExceptionAsObject,
2073 &ExceptionAsObject+1);
2075 // Clear the insertion point to indicate we are in unreachable code.
2076 CGF.Builder.ClearInsertionPoint();
2079 llvm::Value * CGObjCGNU::EmitObjCWeakRead(CodeGen::CodeGenFunction &CGF,
2080 llvm::Value *AddrWeakObj) {
2081 CGBuilderTy B = CGF.Builder;
2082 AddrWeakObj = EnforceType(B, AddrWeakObj, IdTy);
2083 return B.CreateCall(WeakReadFn, AddrWeakObj);
2086 void CGObjCGNU::EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF,
2087 llvm::Value *src, llvm::Value *dst) {
2088 CGBuilderTy B = CGF.Builder;
2089 src = EnforceType(B, src, IdTy);
2090 dst = EnforceType(B, dst, PtrToIdTy);
2091 B.CreateCall2(WeakAssignFn, src, dst);
2094 void CGObjCGNU::EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF,
2095 llvm::Value *src, llvm::Value *dst,
2097 CGBuilderTy B = CGF.Builder;
2098 src = EnforceType(B, src, IdTy);
2099 dst = EnforceType(B, dst, PtrToIdTy);
2101 B.CreateCall2(GlobalAssignFn, src, dst);
2103 // FIXME. Add threadloca assign API
2104 assert(false && "EmitObjCGlobalAssign - Threal Local API NYI");
2107 void CGObjCGNU::EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF,
2108 llvm::Value *src, llvm::Value *dst,
2109 llvm::Value *ivarOffset) {
2110 CGBuilderTy B = CGF.Builder;
2111 src = EnforceType(B, src, IdTy);
2112 dst = EnforceType(B, dst, PtrToIdTy);
2113 B.CreateCall3(IvarAssignFn, src, dst, ivarOffset);
2116 void CGObjCGNU::EmitObjCStrongCastAssign(CodeGen::CodeGenFunction &CGF,
2117 llvm::Value *src, llvm::Value *dst) {
2118 CGBuilderTy B = CGF.Builder;
2119 src = EnforceType(B, src, IdTy);
2120 dst = EnforceType(B, dst, PtrToIdTy);
2121 B.CreateCall2(StrongCastAssignFn, src, dst);
2124 void CGObjCGNU::EmitGCMemmoveCollectable(CodeGen::CodeGenFunction &CGF,
2125 llvm::Value *DestPtr,
2126 llvm::Value *SrcPtr,
2127 llvm::Value *Size) {
2128 CGBuilderTy B = CGF.Builder;
2129 DestPtr = EnforceType(B, DestPtr, IdTy);
2130 SrcPtr = EnforceType(B, SrcPtr, PtrToIdTy);
2132 B.CreateCall3(MemMoveFn, DestPtr, SrcPtr, Size);
2135 llvm::GlobalVariable *CGObjCGNU::ObjCIvarOffsetVariable(
2136 const ObjCInterfaceDecl *ID,
2137 const ObjCIvarDecl *Ivar) {
2138 const std::string Name = "__objc_ivar_offset_" + ID->getNameAsString()
2139 + '.' + Ivar->getNameAsString();
2140 // Emit the variable and initialize it with what we think the correct value
2141 // is. This allows code compiled with non-fragile ivars to work correctly
2142 // when linked against code which isn't (most of the time).
2143 llvm::GlobalVariable *IvarOffsetPointer = TheModule.getNamedGlobal(Name);
2144 if (!IvarOffsetPointer) {
2146 if (ObjCImplementationDecl *OID =
2147 CGM.getContext().getObjCImplementation(
2148 const_cast<ObjCInterfaceDecl *>(ID)))
2149 Offset = ComputeIvarBaseOffset(CGM, OID, Ivar);
2151 Offset = ComputeIvarBaseOffset(CGM, ID, Ivar);
2153 llvm::ConstantInt *OffsetGuess =
2154 llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), Offset, "ivar");
2155 // Don't emit the guess in non-PIC code because the linker will not be able
2156 // to replace it with the real version for a library. In non-PIC code you
2157 // must compile with the fragile ABI if you want to use ivars from a
2158 // GCC-compiled class.
2159 if (CGM.getLangOptions().PICLevel) {
2160 llvm::GlobalVariable *IvarOffsetGV = new llvm::GlobalVariable(TheModule,
2161 llvm::Type::getInt32Ty(VMContext), false,
2162 llvm::GlobalValue::PrivateLinkage, OffsetGuess, Name+".guess");
2163 IvarOffsetPointer = new llvm::GlobalVariable(TheModule,
2164 IvarOffsetGV->getType(), false, llvm::GlobalValue::LinkOnceAnyLinkage,
2165 IvarOffsetGV, Name);
2167 IvarOffsetPointer = new llvm::GlobalVariable(TheModule,
2168 llvm::Type::getInt32PtrTy(VMContext), false,
2169 llvm::GlobalValue::ExternalLinkage, 0, Name);
2172 return IvarOffsetPointer;
2175 LValue CGObjCGNU::EmitObjCValueForIvar(CodeGen::CodeGenFunction &CGF,
2177 llvm::Value *BaseValue,
2178 const ObjCIvarDecl *Ivar,
2179 unsigned CVRQualifiers) {
2180 const ObjCInterfaceDecl *ID =
2181 ObjectTy->getAs<ObjCObjectType>()->getInterface();
2182 return EmitValueForIvarAtOffset(CGF, ID, BaseValue, Ivar, CVRQualifiers,
2183 EmitIvarOffset(CGF, ID, Ivar));
2186 static const ObjCInterfaceDecl *FindIvarInterface(ASTContext &Context,
2187 const ObjCInterfaceDecl *OID,
2188 const ObjCIvarDecl *OIVD) {
2189 llvm::SmallVector<ObjCIvarDecl*, 16> Ivars;
2190 Context.ShallowCollectObjCIvars(OID, Ivars);
2191 for (unsigned k = 0, e = Ivars.size(); k != e; ++k) {
2192 if (OIVD == Ivars[k])
2196 // Otherwise check in the super class.
2197 if (const ObjCInterfaceDecl *Super = OID->getSuperClass())
2198 return FindIvarInterface(Context, Super, OIVD);
2203 llvm::Value *CGObjCGNU::EmitIvarOffset(CodeGen::CodeGenFunction &CGF,
2204 const ObjCInterfaceDecl *Interface,
2205 const ObjCIvarDecl *Ivar) {
2206 if (CGM.getLangOptions().ObjCNonFragileABI) {
2207 Interface = FindIvarInterface(CGM.getContext(), Interface, Ivar);
2208 return CGF.Builder.CreateLoad(CGF.Builder.CreateLoad(
2209 ObjCIvarOffsetVariable(Interface, Ivar), false, "ivar"));
2211 uint64_t Offset = ComputeIvarBaseOffset(CGF.CGM, Interface, Ivar);
2212 return llvm::ConstantInt::get(LongTy, Offset, "ivar");
2215 CodeGen::CGObjCRuntime *
2216 CodeGen::CreateGNUObjCRuntime(CodeGen::CodeGenModule &CGM) {
2217 return new CGObjCGNU(CGM);