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 targeting 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 "CGCleanup.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"
27 #include "clang/Basic/SourceManager.h"
28 #include "clang/Basic/FileManager.h"
30 #include "llvm/Intrinsics.h"
31 #include "llvm/Module.h"
32 #include "llvm/LLVMContext.h"
33 #include "llvm/ADT/SmallVector.h"
34 #include "llvm/ADT/StringMap.h"
35 #include "llvm/Support/CallSite.h"
36 #include "llvm/Support/Compiler.h"
37 #include "llvm/Target/TargetData.h"
42 using namespace clang;
43 using namespace CodeGen;
47 /// Class that lazily initialises the runtime function. Avoids inserting the
48 /// types and the function declaration into a module if they're not used, and
49 /// avoids constructing the type more than once if it's used more than once.
50 class LazyRuntimeFunction {
52 std::vector<llvm::Type*> ArgTys;
53 const char *FunctionName;
54 llvm::Constant *Function;
56 /// Constructor leaves this class uninitialized, because it is intended to
57 /// be used as a field in another class and not all of the types that are
58 /// used as arguments will necessarily be available at construction time.
59 LazyRuntimeFunction() : CGM(0), FunctionName(0), Function(0) {}
61 /// Initialises the lazy function with the name, return type, and the types
64 void init(CodeGenModule *Mod, const char *name,
65 llvm::Type *RetTy, ...) {
71 va_start(Args, RetTy);
72 while (llvm::Type *ArgTy = va_arg(Args, llvm::Type*))
73 ArgTys.push_back(ArgTy);
75 // Push the return type on at the end so we can pop it off easily
76 ArgTys.push_back(RetTy);
78 /// Overloaded cast operator, allows the class to be implicitly cast to an
80 operator llvm::Constant*() {
82 if (0 == FunctionName) return 0;
83 // We put the return type on the end of the vector, so pop it back off
84 llvm::Type *RetTy = ArgTys.back();
86 llvm::FunctionType *FTy = llvm::FunctionType::get(RetTy, ArgTys, false);
88 cast<llvm::Constant>(CGM->CreateRuntimeFunction(FTy, FunctionName));
89 // We won't need to use the types again, so we may as well clean up the
95 operator llvm::Function*() {
96 return cast<llvm::Function>((llvm::Constant*)*this);
102 /// GNU Objective-C runtime code generation. This class implements the parts of
103 /// Objective-C support that are specific to the GNU family of runtimes (GCC and
105 class CGObjCGNU : public CGObjCRuntime {
107 /// The module that is using this class
109 /// The LLVM module into which output is inserted
110 llvm::Module &TheModule;
111 /// strut objc_super. Used for sending messages to super. This structure
112 /// contains the receiver (object) and the expected class.
113 llvm::StructType *ObjCSuperTy;
114 /// struct objc_super*. The type of the argument to the superclass message
115 /// lookup functions.
116 llvm::PointerType *PtrToObjCSuperTy;
117 /// LLVM type for selectors. Opaque pointer (i8*) unless a header declaring
118 /// SEL is included in a header somewhere, in which case it will be whatever
119 /// type is declared in that header, most likely {i8*, i8*}.
120 llvm::PointerType *SelectorTy;
121 /// LLVM i8 type. Cached here to avoid repeatedly getting it in all of the
122 /// places where it's used
123 llvm::IntegerType *Int8Ty;
124 /// Pointer to i8 - LLVM type of char*, for all of the places where the
125 /// runtime needs to deal with C strings.
126 llvm::PointerType *PtrToInt8Ty;
127 /// Instance Method Pointer type. This is a pointer to a function that takes,
128 /// at a minimum, an object and a selector, and is the generic type for
129 /// Objective-C methods. Due to differences between variadic / non-variadic
130 /// calling conventions, it must always be cast to the correct type before
131 /// actually being used.
132 llvm::PointerType *IMPTy;
133 /// Type of an untyped Objective-C object. Clang treats id as a built-in type
134 /// when compiling Objective-C code, so this may be an opaque pointer (i8*),
135 /// but if the runtime header declaring it is included then it may be a
136 /// pointer to a structure.
137 llvm::PointerType *IdTy;
138 /// Pointer to a pointer to an Objective-C object. Used in the new ABI
139 /// message lookup function and some GC-related functions.
140 llvm::PointerType *PtrToIdTy;
141 /// The clang type of id. Used when using the clang CGCall infrastructure to
142 /// call Objective-C methods.
144 /// LLVM type for C int type.
145 llvm::IntegerType *IntTy;
146 /// LLVM type for an opaque pointer. This is identical to PtrToInt8Ty, but is
147 /// used in the code to document the difference between i8* meaning a pointer
148 /// to a C string and i8* meaning a pointer to some opaque type.
149 llvm::PointerType *PtrTy;
150 /// LLVM type for C long type. The runtime uses this in a lot of places where
151 /// it should be using intptr_t, but we can't fix this without breaking
152 /// compatibility with GCC...
153 llvm::IntegerType *LongTy;
154 /// LLVM type for C size_t. Used in various runtime data structures.
155 llvm::IntegerType *SizeTy;
156 /// LLVM type for C intptr_t.
157 llvm::IntegerType *IntPtrTy;
158 /// LLVM type for C ptrdiff_t. Mainly used in property accessor functions.
159 llvm::IntegerType *PtrDiffTy;
160 /// LLVM type for C int*. Used for GCC-ABI-compatible non-fragile instance
162 llvm::PointerType *PtrToIntTy;
163 /// LLVM type for Objective-C BOOL type.
165 /// 32-bit integer type, to save us needing to look it up every time it's used.
166 llvm::IntegerType *Int32Ty;
167 /// 64-bit integer type, to save us needing to look it up every time it's used.
168 llvm::IntegerType *Int64Ty;
169 /// Metadata kind used to tie method lookups to message sends. The GNUstep
170 /// runtime provides some LLVM passes that can use this to do things like
171 /// automatic IMP caching and speculative inlining.
172 unsigned msgSendMDKind;
173 /// Helper function that generates a constant string and returns a pointer to
174 /// the start of the string. The result of this function can be used anywhere
175 /// where the C code specifies const char*.
176 llvm::Constant *MakeConstantString(const std::string &Str,
177 const std::string &Name="") {
178 llvm::Constant *ConstStr = CGM.GetAddrOfConstantCString(Str, Name.c_str());
179 return llvm::ConstantExpr::getGetElementPtr(ConstStr, Zeros);
181 /// Emits a linkonce_odr string, whose name is the prefix followed by the
182 /// string value. This allows the linker to combine the strings between
183 /// different modules. Used for EH typeinfo names, selector strings, and a
184 /// few other things.
185 llvm::Constant *ExportUniqueString(const std::string &Str,
186 const std::string prefix) {
187 std::string name = prefix + Str;
188 llvm::Constant *ConstStr = TheModule.getGlobalVariable(name);
190 llvm::Constant *value = llvm::ConstantArray::get(VMContext, Str, true);
191 ConstStr = new llvm::GlobalVariable(TheModule, value->getType(), true,
192 llvm::GlobalValue::LinkOnceODRLinkage, value, prefix + Str);
194 return llvm::ConstantExpr::getGetElementPtr(ConstStr, Zeros);
196 /// Generates a global structure, initialized by the elements in the vector.
197 /// The element types must match the types of the structure elements in the
199 llvm::GlobalVariable *MakeGlobal(llvm::StructType *Ty,
200 llvm::ArrayRef<llvm::Constant*> V,
202 llvm::GlobalValue::LinkageTypes linkage
203 =llvm::GlobalValue::InternalLinkage) {
204 llvm::Constant *C = llvm::ConstantStruct::get(Ty, V);
205 return new llvm::GlobalVariable(TheModule, Ty, false,
208 /// Generates a global array. The vector must contain the same number of
209 /// elements that the array type declares, of the type specified as the array
211 llvm::GlobalVariable *MakeGlobal(llvm::ArrayType *Ty,
212 llvm::ArrayRef<llvm::Constant*> V,
214 llvm::GlobalValue::LinkageTypes linkage
215 =llvm::GlobalValue::InternalLinkage) {
216 llvm::Constant *C = llvm::ConstantArray::get(Ty, V);
217 return new llvm::GlobalVariable(TheModule, Ty, false,
220 /// Generates a global array, inferring the array type from the specified
221 /// element type and the size of the initialiser.
222 llvm::GlobalVariable *MakeGlobalArray(llvm::Type *Ty,
223 llvm::ArrayRef<llvm::Constant*> V,
225 llvm::GlobalValue::LinkageTypes linkage
226 =llvm::GlobalValue::InternalLinkage) {
227 llvm::ArrayType *ArrayTy = llvm::ArrayType::get(Ty, V.size());
228 return MakeGlobal(ArrayTy, V, Name, linkage);
230 /// Ensures that the value has the required type, by inserting a bitcast if
231 /// required. This function lets us avoid inserting bitcasts that are
233 llvm::Value* EnforceType(CGBuilderTy B, llvm::Value *V, llvm::Type *Ty){
234 if (V->getType() == Ty) return V;
235 return B.CreateBitCast(V, Ty);
237 // Some zeros used for GEPs in lots of places.
238 llvm::Constant *Zeros[2];
239 /// Null pointer value. Mainly used as a terminator in various arrays.
240 llvm::Constant *NULLPtr;
242 llvm::LLVMContext &VMContext;
244 /// Placeholder for the class. Lots of things refer to the class before we've
245 /// actually emitted it. We use this alias as a placeholder, and then replace
246 /// it with a pointer to the class structure before finally emitting the
248 llvm::GlobalAlias *ClassPtrAlias;
249 /// Placeholder for the metaclass. Lots of things refer to the class before
250 /// we've / actually emitted it. We use this alias as a placeholder, and then
251 /// replace / it with a pointer to the metaclass structure before finally
252 /// emitting the / module.
253 llvm::GlobalAlias *MetaClassPtrAlias;
254 /// All of the classes that have been generated for this compilation units.
255 std::vector<llvm::Constant*> Classes;
256 /// All of the categories that have been generated for this compilation units.
257 std::vector<llvm::Constant*> Categories;
258 /// All of the Objective-C constant strings that have been generated for this
259 /// compilation units.
260 std::vector<llvm::Constant*> ConstantStrings;
261 /// Map from string values to Objective-C constant strings in the output.
262 /// Used to prevent emitting Objective-C strings more than once. This should
263 /// not be required at all - CodeGenModule should manage this list.
264 llvm::StringMap<llvm::Constant*> ObjCStrings;
265 /// All of the protocols that have been declared.
266 llvm::StringMap<llvm::Constant*> ExistingProtocols;
267 /// For each variant of a selector, we store the type encoding and a
268 /// placeholder value. For an untyped selector, the type will be the empty
269 /// string. Selector references are all done via the module's selector table,
270 /// so we create an alias as a placeholder and then replace it with the real
272 typedef std::pair<std::string, llvm::GlobalAlias*> TypedSelector;
273 /// Type of the selector map. This is roughly equivalent to the structure
274 /// used in the GNUstep runtime, which maintains a list of all of the valid
275 /// types for a selector in a table.
276 typedef llvm::DenseMap<Selector, SmallVector<TypedSelector, 2> >
278 /// A map from selectors to selector types. This allows us to emit all
279 /// selectors of the same name and type together.
280 SelectorMap SelectorTable;
282 /// Selectors related to memory management. When compiling in GC mode, we
284 Selector RetainSel, ReleaseSel, AutoreleaseSel;
285 /// Runtime functions used for memory management in GC mode. Note that clang
286 /// supports code generation for calling these functions, but neither GNU
287 /// runtime actually supports this API properly yet.
288 LazyRuntimeFunction IvarAssignFn, StrongCastAssignFn, MemMoveFn, WeakReadFn,
289 WeakAssignFn, GlobalAssignFn;
292 /// Function used for throwing Objective-C exceptions.
293 LazyRuntimeFunction ExceptionThrowFn;
294 /// Function used for rethrowing exceptions, used at the end of @finally or
295 /// @synchronize blocks.
296 LazyRuntimeFunction ExceptionReThrowFn;
297 /// Function called when entering a catch function. This is required for
298 /// differentiating Objective-C exceptions and foreign exceptions.
299 LazyRuntimeFunction EnterCatchFn;
300 /// Function called when exiting from a catch block. Used to do exception
302 LazyRuntimeFunction ExitCatchFn;
303 /// Function called when entering an @synchronize block. Acquires the lock.
304 LazyRuntimeFunction SyncEnterFn;
305 /// Function called when exiting an @synchronize block. Releases the lock.
306 LazyRuntimeFunction SyncExitFn;
310 /// Function called if fast enumeration detects that the collection is
311 /// modified during the update.
312 LazyRuntimeFunction EnumerationMutationFn;
313 /// Function for implementing synthesized property getters that return an
315 LazyRuntimeFunction GetPropertyFn;
316 /// Function for implementing synthesized property setters that return an
318 LazyRuntimeFunction SetPropertyFn;
319 /// Function used for non-object declared property getters.
320 LazyRuntimeFunction GetStructPropertyFn;
321 /// Function used for non-object declared property setters.
322 LazyRuntimeFunction SetStructPropertyFn;
324 /// The version of the runtime that this class targets. Must match the
325 /// version in the runtime.
327 /// The version of the protocol class. Used to differentiate between ObjC1
328 /// and ObjC2 protocols. Objective-C 1 protocols can not contain optional
329 /// components and can not contain declared properties. We always emit
330 /// Objective-C 2 property structures, but we have to pretend that they're
331 /// Objective-C 1 property structures when targeting the GCC runtime or it
333 const int ProtocolVersion;
335 /// Generates an instance variable list structure. This is a structure
336 /// containing a size and an array of structures containing instance variable
337 /// metadata. This is used purely for introspection in the fragile ABI. In
338 /// the non-fragile ABI, it's used for instance variable fixup.
339 llvm::Constant *GenerateIvarList(
340 const SmallVectorImpl<llvm::Constant *> &IvarNames,
341 const SmallVectorImpl<llvm::Constant *> &IvarTypes,
342 const SmallVectorImpl<llvm::Constant *> &IvarOffsets);
343 /// Generates a method list structure. This is a structure containing a size
344 /// and an array of structures containing method metadata.
346 /// This structure is used by both classes and categories, and contains a next
347 /// pointer allowing them to be chained together in a linked list.
348 llvm::Constant *GenerateMethodList(const StringRef &ClassName,
349 const StringRef &CategoryName,
350 const SmallVectorImpl<Selector> &MethodSels,
351 const SmallVectorImpl<llvm::Constant *> &MethodTypes,
352 bool isClassMethodList);
353 /// Emits an empty protocol. This is used for @protocol() where no protocol
354 /// is found. The runtime will (hopefully) fix up the pointer to refer to the
356 llvm::Constant *GenerateEmptyProtocol(const std::string &ProtocolName);
357 /// Generates a list of property metadata structures. This follows the same
358 /// pattern as method and instance variable metadata lists.
359 llvm::Constant *GeneratePropertyList(const ObjCImplementationDecl *OID,
360 SmallVectorImpl<Selector> &InstanceMethodSels,
361 SmallVectorImpl<llvm::Constant*> &InstanceMethodTypes);
362 /// Generates a list of referenced protocols. Classes, categories, and
363 /// protocols all use this structure.
364 llvm::Constant *GenerateProtocolList(
365 const SmallVectorImpl<std::string> &Protocols);
366 /// To ensure that all protocols are seen by the runtime, we add a category on
367 /// a class defined in the runtime, declaring no methods, but adopting the
368 /// protocols. This is a horribly ugly hack, but it allows us to collect all
369 /// of the protocols without changing the ABI.
370 void GenerateProtocolHolderCategory(void);
371 /// Generates a class structure.
372 llvm::Constant *GenerateClassStructure(
373 llvm::Constant *MetaClass,
374 llvm::Constant *SuperClass,
377 llvm::Constant *Version,
378 llvm::Constant *InstanceSize,
379 llvm::Constant *IVars,
380 llvm::Constant *Methods,
381 llvm::Constant *Protocols,
382 llvm::Constant *IvarOffsets,
383 llvm::Constant *Properties,
384 llvm::Constant *StrongIvarBitmap,
385 llvm::Constant *WeakIvarBitmap,
387 /// Generates a method list. This is used by protocols to define the required
388 /// and optional methods.
389 llvm::Constant *GenerateProtocolMethodList(
390 const SmallVectorImpl<llvm::Constant *> &MethodNames,
391 const SmallVectorImpl<llvm::Constant *> &MethodTypes);
392 /// Returns a selector with the specified type encoding. An empty string is
393 /// used to return an untyped selector (with the types field set to NULL).
394 llvm::Value *GetSelector(CGBuilderTy &Builder, Selector Sel,
395 const std::string &TypeEncoding, bool lval);
396 /// Returns the variable used to store the offset of an instance variable.
397 llvm::GlobalVariable *ObjCIvarOffsetVariable(const ObjCInterfaceDecl *ID,
398 const ObjCIvarDecl *Ivar);
399 /// Emits a reference to a class. This allows the linker to object if there
400 /// is no class of the matching name.
401 void EmitClassRef(const std::string &className);
402 /// Emits a pointer to the named class
403 llvm::Value *GetClassNamed(CGBuilderTy &Builder, const std::string &Name,
406 /// Looks up the method for sending a message to the specified object. This
407 /// mechanism differs between the GCC and GNU runtimes, so this method must be
408 /// overridden in subclasses.
409 virtual llvm::Value *LookupIMP(CodeGenFunction &CGF,
410 llvm::Value *&Receiver,
412 llvm::MDNode *node) = 0;
413 /// Looks up the method for sending a message to a superclass. This
414 /// mechanism differs between the GCC and GNU runtimes, so this method must
415 /// be overridden in subclasses.
416 virtual llvm::Value *LookupIMPSuper(CodeGenFunction &CGF,
417 llvm::Value *ObjCSuper,
418 llvm::Value *cmd) = 0;
419 /// Libobjc2 uses a bitfield representation where small(ish) bitfields are
420 /// stored in a 64-bit value with the low bit set to 1 and the remaining 63
421 /// bits set to their values, LSB first, while larger ones are stored in a
422 /// structure of this / form:
424 /// struct { int32_t length; int32_t values[length]; };
426 /// The values in the array are stored in host-endian format, with the least
427 /// significant bit being assumed to come first in the bitfield. Therefore,
428 /// a bitfield with the 64th bit set will be (int64_t)&{ 2, [0, 1<<31] },
429 /// while a bitfield / with the 63rd bit set will be 1<<64.
430 llvm::Constant *MakeBitField(llvm::SmallVectorImpl<bool> &bits);
432 CGObjCGNU(CodeGenModule &cgm, unsigned runtimeABIVersion,
433 unsigned protocolClassVersion);
435 virtual llvm::Constant *GenerateConstantString(const StringLiteral *);
438 GenerateMessageSend(CodeGenFunction &CGF,
439 ReturnValueSlot Return,
442 llvm::Value *Receiver,
443 const CallArgList &CallArgs,
444 const ObjCInterfaceDecl *Class,
445 const ObjCMethodDecl *Method);
447 GenerateMessageSendSuper(CodeGenFunction &CGF,
448 ReturnValueSlot Return,
451 const ObjCInterfaceDecl *Class,
453 llvm::Value *Receiver,
455 const CallArgList &CallArgs,
456 const ObjCMethodDecl *Method);
457 virtual llvm::Value *GetClass(CGBuilderTy &Builder,
458 const ObjCInterfaceDecl *OID);
459 virtual llvm::Value *GetSelector(CGBuilderTy &Builder, Selector Sel,
461 virtual llvm::Value *GetSelector(CGBuilderTy &Builder, const ObjCMethodDecl
463 virtual llvm::Constant *GetEHType(QualType T);
465 virtual llvm::Function *GenerateMethod(const ObjCMethodDecl *OMD,
466 const ObjCContainerDecl *CD);
467 virtual void GenerateCategory(const ObjCCategoryImplDecl *CMD);
468 virtual void GenerateClass(const ObjCImplementationDecl *ClassDecl);
469 virtual llvm::Value *GenerateProtocolRef(CGBuilderTy &Builder,
470 const ObjCProtocolDecl *PD);
471 virtual void GenerateProtocol(const ObjCProtocolDecl *PD);
472 virtual llvm::Function *ModuleInitFunction();
473 virtual llvm::Constant *GetPropertyGetFunction();
474 virtual llvm::Constant *GetPropertySetFunction();
475 virtual llvm::Constant *GetSetStructFunction();
476 virtual llvm::Constant *GetGetStructFunction();
477 virtual llvm::Constant *EnumerationMutationFunction();
479 virtual void EmitTryStmt(CodeGenFunction &CGF,
480 const ObjCAtTryStmt &S);
481 virtual void EmitSynchronizedStmt(CodeGenFunction &CGF,
482 const ObjCAtSynchronizedStmt &S);
483 virtual void EmitThrowStmt(CodeGenFunction &CGF,
484 const ObjCAtThrowStmt &S);
485 virtual llvm::Value * EmitObjCWeakRead(CodeGenFunction &CGF,
486 llvm::Value *AddrWeakObj);
487 virtual void EmitObjCWeakAssign(CodeGenFunction &CGF,
488 llvm::Value *src, llvm::Value *dst);
489 virtual void EmitObjCGlobalAssign(CodeGenFunction &CGF,
490 llvm::Value *src, llvm::Value *dest,
491 bool threadlocal=false);
492 virtual void EmitObjCIvarAssign(CodeGenFunction &CGF,
493 llvm::Value *src, llvm::Value *dest,
494 llvm::Value *ivarOffset);
495 virtual void EmitObjCStrongCastAssign(CodeGenFunction &CGF,
496 llvm::Value *src, llvm::Value *dest);
497 virtual void EmitGCMemmoveCollectable(CodeGenFunction &CGF,
498 llvm::Value *DestPtr,
501 virtual LValue EmitObjCValueForIvar(CodeGenFunction &CGF,
503 llvm::Value *BaseValue,
504 const ObjCIvarDecl *Ivar,
505 unsigned CVRQualifiers);
506 virtual llvm::Value *EmitIvarOffset(CodeGenFunction &CGF,
507 const ObjCInterfaceDecl *Interface,
508 const ObjCIvarDecl *Ivar);
509 virtual llvm::Value *EmitNSAutoreleasePoolClassRef(CGBuilderTy &Builder);
510 virtual llvm::Constant *BuildGCBlockLayout(CodeGenModule &CGM,
511 const CGBlockInfo &blockInfo) {
515 virtual llvm::GlobalVariable *GetClassGlobal(const std::string &Name) {
519 /// Class representing the legacy GCC Objective-C ABI. This is the default when
520 /// -fobjc-nonfragile-abi is not specified.
522 /// The GCC ABI target actually generates code that is approximately compatible
523 /// with the new GNUstep runtime ABI, but refrains from using any features that
524 /// would not work with the GCC runtime. For example, clang always generates
525 /// the extended form of the class structure, and the extra fields are simply
526 /// ignored by GCC libobjc.
527 class CGObjCGCC : public CGObjCGNU {
528 /// The GCC ABI message lookup function. Returns an IMP pointing to the
529 /// method implementation for this message.
530 LazyRuntimeFunction MsgLookupFn;
531 /// The GCC ABI superclass message lookup function. Takes a pointer to a
532 /// structure describing the receiver and the class, and a selector as
533 /// arguments. Returns the IMP for the corresponding method.
534 LazyRuntimeFunction MsgLookupSuperFn;
536 virtual llvm::Value *LookupIMP(CodeGenFunction &CGF,
537 llvm::Value *&Receiver,
539 llvm::MDNode *node) {
540 CGBuilderTy &Builder = CGF.Builder;
541 llvm::Value *args[] = {
542 EnforceType(Builder, Receiver, IdTy),
543 EnforceType(Builder, cmd, SelectorTy) };
544 llvm::CallSite imp = CGF.EmitCallOrInvoke(MsgLookupFn, args);
545 imp->setMetadata(msgSendMDKind, node);
546 return imp.getInstruction();
548 virtual llvm::Value *LookupIMPSuper(CodeGenFunction &CGF,
549 llvm::Value *ObjCSuper,
551 CGBuilderTy &Builder = CGF.Builder;
552 llvm::Value *lookupArgs[] = {EnforceType(Builder, ObjCSuper,
553 PtrToObjCSuperTy), cmd};
554 return Builder.CreateCall(MsgLookupSuperFn, lookupArgs);
557 CGObjCGCC(CodeGenModule &Mod) : CGObjCGNU(Mod, 8, 2) {
558 // IMP objc_msg_lookup(id, SEL);
559 MsgLookupFn.init(&CGM, "objc_msg_lookup", IMPTy, IdTy, SelectorTy, NULL);
560 // IMP objc_msg_lookup_super(struct objc_super*, SEL);
561 MsgLookupSuperFn.init(&CGM, "objc_msg_lookup_super", IMPTy,
562 PtrToObjCSuperTy, SelectorTy, NULL);
565 /// Class used when targeting the new GNUstep runtime ABI.
566 class CGObjCGNUstep : public CGObjCGNU {
567 /// The slot lookup function. Returns a pointer to a cacheable structure
568 /// that contains (among other things) the IMP.
569 LazyRuntimeFunction SlotLookupFn;
570 /// The GNUstep ABI superclass message lookup function. Takes a pointer to
571 /// a structure describing the receiver and the class, and a selector as
572 /// arguments. Returns the slot for the corresponding method. Superclass
573 /// message lookup rarely changes, so this is a good caching opportunity.
574 LazyRuntimeFunction SlotLookupSuperFn;
575 /// Type of an slot structure pointer. This is returned by the various
576 /// lookup functions.
579 virtual llvm::Value *LookupIMP(CodeGenFunction &CGF,
580 llvm::Value *&Receiver,
582 llvm::MDNode *node) {
583 CGBuilderTy &Builder = CGF.Builder;
584 llvm::Function *LookupFn = SlotLookupFn;
586 // Store the receiver on the stack so that we can reload it later
587 llvm::Value *ReceiverPtr = CGF.CreateTempAlloca(Receiver->getType());
588 Builder.CreateStore(Receiver, ReceiverPtr);
592 if (isa<ObjCMethodDecl>(CGF.CurCodeDecl)) {
593 self = CGF.LoadObjCSelf();
595 self = llvm::ConstantPointerNull::get(IdTy);
598 // The lookup function is guaranteed not to capture the receiver pointer.
599 LookupFn->setDoesNotCapture(1);
601 llvm::Value *args[] = {
602 EnforceType(Builder, ReceiverPtr, PtrToIdTy),
603 EnforceType(Builder, cmd, SelectorTy),
604 EnforceType(Builder, self, IdTy) };
605 llvm::CallSite slot = CGF.EmitCallOrInvoke(LookupFn, args);
606 slot.setOnlyReadsMemory();
607 slot->setMetadata(msgSendMDKind, node);
609 // Load the imp from the slot
611 Builder.CreateLoad(Builder.CreateStructGEP(slot.getInstruction(), 4));
613 // The lookup function may have changed the receiver, so make sure we use
615 Receiver = Builder.CreateLoad(ReceiverPtr, true);
618 virtual llvm::Value *LookupIMPSuper(CodeGenFunction &CGF,
619 llvm::Value *ObjCSuper,
621 CGBuilderTy &Builder = CGF.Builder;
622 llvm::Value *lookupArgs[] = {ObjCSuper, cmd};
624 llvm::CallInst *slot = Builder.CreateCall(SlotLookupSuperFn, lookupArgs);
625 slot->setOnlyReadsMemory();
627 return Builder.CreateLoad(Builder.CreateStructGEP(slot, 4));
630 CGObjCGNUstep(CodeGenModule &Mod) : CGObjCGNU(Mod, 9, 3) {
631 llvm::StructType *SlotStructTy = llvm::StructType::get(PtrTy,
632 PtrTy, PtrTy, IntTy, IMPTy, NULL);
633 SlotTy = llvm::PointerType::getUnqual(SlotStructTy);
634 // Slot_t objc_msg_lookup_sender(id *receiver, SEL selector, id sender);
635 SlotLookupFn.init(&CGM, "objc_msg_lookup_sender", SlotTy, PtrToIdTy,
636 SelectorTy, IdTy, NULL);
637 // Slot_t objc_msg_lookup_super(struct objc_super*, SEL);
638 SlotLookupSuperFn.init(&CGM, "objc_slot_lookup_super", SlotTy,
639 PtrToObjCSuperTy, SelectorTy, NULL);
640 // If we're in ObjC++ mode, then we want to make
641 if (CGM.getLangOptions().CPlusPlus) {
642 llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext);
643 // void *__cxa_begin_catch(void *e)
644 EnterCatchFn.init(&CGM, "__cxa_begin_catch", PtrTy, PtrTy, NULL);
645 // void __cxa_end_catch(void)
646 ExitCatchFn.init(&CGM, "__cxa_end_catch", VoidTy, NULL);
647 // void _Unwind_Resume_or_Rethrow(void*)
648 ExceptionReThrowFn.init(&CGM, "_Unwind_Resume_or_Rethrow", VoidTy, PtrTy, NULL);
653 } // end anonymous namespace
656 /// Emits a reference to a dummy variable which is emitted with each class.
657 /// This ensures that a linker error will be generated when trying to link
658 /// together modules where a referenced class is not defined.
659 void CGObjCGNU::EmitClassRef(const std::string &className) {
660 std::string symbolRef = "__objc_class_ref_" + className;
661 // Don't emit two copies of the same symbol
662 if (TheModule.getGlobalVariable(symbolRef))
664 std::string symbolName = "__objc_class_name_" + className;
665 llvm::GlobalVariable *ClassSymbol = TheModule.getGlobalVariable(symbolName);
667 ClassSymbol = new llvm::GlobalVariable(TheModule, LongTy, false,
668 llvm::GlobalValue::ExternalLinkage, 0, symbolName);
670 new llvm::GlobalVariable(TheModule, ClassSymbol->getType(), true,
671 llvm::GlobalValue::WeakAnyLinkage, ClassSymbol, symbolRef);
674 static std::string SymbolNameForMethod(const StringRef &ClassName,
675 const StringRef &CategoryName, const Selector MethodName,
676 bool isClassMethod) {
677 std::string MethodNameColonStripped = MethodName.getAsString();
678 std::replace(MethodNameColonStripped.begin(), MethodNameColonStripped.end(),
680 return (Twine(isClassMethod ? "_c_" : "_i_") + ClassName + "_" +
681 CategoryName + "_" + MethodNameColonStripped).str();
684 CGObjCGNU::CGObjCGNU(CodeGenModule &cgm, unsigned runtimeABIVersion,
685 unsigned protocolClassVersion)
686 : CGM(cgm), TheModule(CGM.getModule()), VMContext(cgm.getLLVMContext()),
687 ClassPtrAlias(0), MetaClassPtrAlias(0), RuntimeVersion(runtimeABIVersion),
688 ProtocolVersion(protocolClassVersion) {
690 msgSendMDKind = VMContext.getMDKindID("GNUObjCMessageSend");
692 CodeGenTypes &Types = CGM.getTypes();
693 IntTy = cast<llvm::IntegerType>(
694 Types.ConvertType(CGM.getContext().IntTy));
695 LongTy = cast<llvm::IntegerType>(
696 Types.ConvertType(CGM.getContext().LongTy));
697 SizeTy = cast<llvm::IntegerType>(
698 Types.ConvertType(CGM.getContext().getSizeType()));
699 PtrDiffTy = cast<llvm::IntegerType>(
700 Types.ConvertType(CGM.getContext().getPointerDiffType()));
701 BoolTy = CGM.getTypes().ConvertType(CGM.getContext().BoolTy);
703 Int8Ty = llvm::Type::getInt8Ty(VMContext);
704 // C string type. Used in lots of places.
705 PtrToInt8Ty = llvm::PointerType::getUnqual(Int8Ty);
707 Zeros[0] = llvm::ConstantInt::get(LongTy, 0);
709 NULLPtr = llvm::ConstantPointerNull::get(PtrToInt8Ty);
710 // Get the selector Type.
711 QualType selTy = CGM.getContext().getObjCSelType();
712 if (QualType() == selTy) {
713 SelectorTy = PtrToInt8Ty;
715 SelectorTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(selTy));
718 PtrToIntTy = llvm::PointerType::getUnqual(IntTy);
721 Int32Ty = llvm::Type::getInt32Ty(VMContext);
722 Int64Ty = llvm::Type::getInt64Ty(VMContext);
725 TheModule.getPointerSize() == llvm::Module::Pointer32 ? Int32Ty : Int64Ty;
728 QualType UnqualIdTy = CGM.getContext().getObjCIdType();
729 ASTIdTy = CanQualType();
730 if (UnqualIdTy != QualType()) {
731 ASTIdTy = CGM.getContext().getCanonicalType(UnqualIdTy);
732 IdTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(ASTIdTy));
736 PtrToIdTy = llvm::PointerType::getUnqual(IdTy);
738 ObjCSuperTy = llvm::StructType::get(IdTy, IdTy, NULL);
739 PtrToObjCSuperTy = llvm::PointerType::getUnqual(ObjCSuperTy);
741 llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext);
743 // void objc_exception_throw(id);
744 ExceptionThrowFn.init(&CGM, "objc_exception_throw", VoidTy, IdTy, NULL);
745 ExceptionReThrowFn.init(&CGM, "objc_exception_throw", VoidTy, IdTy, NULL);
746 // int objc_sync_enter(id);
747 SyncEnterFn.init(&CGM, "objc_sync_enter", IntTy, IdTy, NULL);
748 // int objc_sync_exit(id);
749 SyncExitFn.init(&CGM, "objc_sync_exit", IntTy, IdTy, NULL);
751 // void objc_enumerationMutation (id)
752 EnumerationMutationFn.init(&CGM, "objc_enumerationMutation", VoidTy,
755 // id objc_getProperty(id, SEL, ptrdiff_t, BOOL)
756 GetPropertyFn.init(&CGM, "objc_getProperty", IdTy, IdTy, SelectorTy,
757 PtrDiffTy, BoolTy, NULL);
758 // void objc_setProperty(id, SEL, ptrdiff_t, id, BOOL, BOOL)
759 SetPropertyFn.init(&CGM, "objc_setProperty", VoidTy, IdTy, SelectorTy,
760 PtrDiffTy, IdTy, BoolTy, BoolTy, NULL);
761 // void objc_setPropertyStruct(void*, void*, ptrdiff_t, BOOL, BOOL)
762 GetStructPropertyFn.init(&CGM, "objc_getPropertyStruct", VoidTy, PtrTy, PtrTy,
763 PtrDiffTy, BoolTy, BoolTy, NULL);
764 // void objc_setPropertyStruct(void*, void*, ptrdiff_t, BOOL, BOOL)
765 SetStructPropertyFn.init(&CGM, "objc_setPropertyStruct", VoidTy, PtrTy, PtrTy,
766 PtrDiffTy, BoolTy, BoolTy, NULL);
769 llvm::Type *IMPArgs[] = { IdTy, SelectorTy };
770 IMPTy = llvm::PointerType::getUnqual(llvm::FunctionType::get(IdTy, IMPArgs,
773 const LangOptions &Opts = CGM.getLangOptions();
774 if ((Opts.getGC() != LangOptions::NonGC) || Opts.ObjCAutoRefCount)
777 // Don't bother initialising the GC stuff unless we're compiling in GC mode
778 if (Opts.getGC() != LangOptions::NonGC) {
779 // This is a bit of an hack. We should sort this out by having a proper
780 // CGObjCGNUstep subclass for GC, but we may want to really support the old
781 // ABI and GC added in ObjectiveC2.framework, so we fudge it a bit for now
782 // Get selectors needed in GC mode
783 RetainSel = GetNullarySelector("retain", CGM.getContext());
784 ReleaseSel = GetNullarySelector("release", CGM.getContext());
785 AutoreleaseSel = GetNullarySelector("autorelease", CGM.getContext());
787 // Get functions needed in GC mode
789 // id objc_assign_ivar(id, id, ptrdiff_t);
790 IvarAssignFn.init(&CGM, "objc_assign_ivar", IdTy, IdTy, IdTy, PtrDiffTy,
792 // id objc_assign_strongCast (id, id*)
793 StrongCastAssignFn.init(&CGM, "objc_assign_strongCast", IdTy, IdTy,
795 // id objc_assign_global(id, id*);
796 GlobalAssignFn.init(&CGM, "objc_assign_global", IdTy, IdTy, PtrToIdTy,
798 // id objc_assign_weak(id, id*);
799 WeakAssignFn.init(&CGM, "objc_assign_weak", IdTy, IdTy, PtrToIdTy, NULL);
800 // id objc_read_weak(id*);
801 WeakReadFn.init(&CGM, "objc_read_weak", IdTy, PtrToIdTy, NULL);
802 // void *objc_memmove_collectable(void*, void *, size_t);
803 MemMoveFn.init(&CGM, "objc_memmove_collectable", PtrTy, PtrTy, PtrTy,
808 llvm::Value *CGObjCGNU::GetClassNamed(CGBuilderTy &Builder,
809 const std::string &Name,
811 llvm::Value *ClassName = CGM.GetAddrOfConstantCString(Name);
812 // With the incompatible ABI, this will need to be replaced with a direct
813 // reference to the class symbol. For the compatible nonfragile ABI we are
814 // still performing this lookup at run time but emitting the symbol for the
815 // class externally so that we can make the switch later.
817 // Libobjc2 contains an LLVM pass that replaces calls to objc_lookup_class
818 // with memoized versions or with static references if it's safe to do so.
821 ClassName = Builder.CreateStructGEP(ClassName, 0);
823 llvm::Constant *ClassLookupFn =
824 CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, PtrToInt8Ty, true),
825 "objc_lookup_class");
826 return Builder.CreateCall(ClassLookupFn, ClassName);
829 // This has to perform the lookup every time, since posing and related
830 // techniques can modify the name -> class mapping.
831 llvm::Value *CGObjCGNU::GetClass(CGBuilderTy &Builder,
832 const ObjCInterfaceDecl *OID) {
833 return GetClassNamed(Builder, OID->getNameAsString(), OID->isWeakImported());
835 llvm::Value *CGObjCGNU::EmitNSAutoreleasePoolClassRef(CGBuilderTy &Builder) {
836 return GetClassNamed(Builder, "NSAutoreleasePool", false);
839 llvm::Value *CGObjCGNU::GetSelector(CGBuilderTy &Builder, Selector Sel,
840 const std::string &TypeEncoding, bool lval) {
842 SmallVector<TypedSelector, 2> &Types = SelectorTable[Sel];
843 llvm::GlobalAlias *SelValue = 0;
846 for (SmallVectorImpl<TypedSelector>::iterator i = Types.begin(),
847 e = Types.end() ; i!=e ; i++) {
848 if (i->first == TypeEncoding) {
849 SelValue = i->second;
854 SelValue = new llvm::GlobalAlias(SelectorTy,
855 llvm::GlobalValue::PrivateLinkage,
856 ".objc_selector_"+Sel.getAsString(), NULL,
858 Types.push_back(TypedSelector(TypeEncoding, SelValue));
862 llvm::Value *tmp = Builder.CreateAlloca(SelValue->getType());
863 Builder.CreateStore(SelValue, tmp);
869 llvm::Value *CGObjCGNU::GetSelector(CGBuilderTy &Builder, Selector Sel,
871 return GetSelector(Builder, Sel, std::string(), lval);
874 llvm::Value *CGObjCGNU::GetSelector(CGBuilderTy &Builder, const ObjCMethodDecl
876 std::string SelTypes;
877 CGM.getContext().getObjCEncodingForMethodDecl(Method, SelTypes);
878 return GetSelector(Builder, Method->getSelector(), SelTypes, false);
881 llvm::Constant *CGObjCGNU::GetEHType(QualType T) {
882 if (!CGM.getLangOptions().CPlusPlus) {
883 if (T->isObjCIdType()
884 || T->isObjCQualifiedIdType()) {
885 // With the old ABI, there was only one kind of catchall, which broke
886 // foreign exceptions. With the new ABI, we use __objc_id_typeinfo as
887 // a pointer indicating object catchalls, and NULL to indicate real
889 if (CGM.getLangOptions().ObjCNonFragileABI) {
890 return MakeConstantString("@id");
896 // All other types should be Objective-C interface pointer types.
897 const ObjCObjectPointerType *OPT =
898 T->getAs<ObjCObjectPointerType>();
899 assert(OPT && "Invalid @catch type.");
900 const ObjCInterfaceDecl *IDecl =
901 OPT->getObjectType()->getInterface();
902 assert(IDecl && "Invalid @catch type.");
903 return MakeConstantString(IDecl->getIdentifier()->getName());
905 // For Objective-C++, we want to provide the ability to catch both C++ and
906 // Objective-C objects in the same function.
908 // There's a particular fixed type info for 'id'.
909 if (T->isObjCIdType() ||
910 T->isObjCQualifiedIdType()) {
911 llvm::Constant *IDEHType =
912 CGM.getModule().getGlobalVariable("__objc_id_type_info");
915 new llvm::GlobalVariable(CGM.getModule(), PtrToInt8Ty,
917 llvm::GlobalValue::ExternalLinkage,
918 0, "__objc_id_type_info");
919 return llvm::ConstantExpr::getBitCast(IDEHType, PtrToInt8Ty);
922 const ObjCObjectPointerType *PT =
923 T->getAs<ObjCObjectPointerType>();
924 assert(PT && "Invalid @catch type.");
925 const ObjCInterfaceType *IT = PT->getInterfaceType();
926 assert(IT && "Invalid @catch type.");
927 std::string className = IT->getDecl()->getIdentifier()->getName();
929 std::string typeinfoName = "__objc_eh_typeinfo_" + className;
931 // Return the existing typeinfo if it exists
932 llvm::Constant *typeinfo = TheModule.getGlobalVariable(typeinfoName);
933 if (typeinfo) return typeinfo;
935 // Otherwise create it.
937 // vtable for gnustep::libobjc::__objc_class_type_info
938 // It's quite ugly hard-coding this. Ideally we'd generate it using the host
939 // platform's name mangling.
940 const char *vtableName = "_ZTVN7gnustep7libobjc22__objc_class_type_infoE";
941 llvm::Constant *Vtable = TheModule.getGlobalVariable(vtableName);
943 Vtable = new llvm::GlobalVariable(TheModule, PtrToInt8Ty, true,
944 llvm::GlobalValue::ExternalLinkage, 0, vtableName);
946 llvm::Constant *Two = llvm::ConstantInt::get(IntTy, 2);
947 Vtable = llvm::ConstantExpr::getGetElementPtr(Vtable, Two);
948 Vtable = llvm::ConstantExpr::getBitCast(Vtable, PtrToInt8Ty);
950 llvm::Constant *typeName =
951 ExportUniqueString(className, "__objc_eh_typename_");
953 std::vector<llvm::Constant*> fields;
954 fields.push_back(Vtable);
955 fields.push_back(typeName);
957 MakeGlobal(llvm::StructType::get(PtrToInt8Ty, PtrToInt8Ty,
958 NULL), fields, "__objc_eh_typeinfo_" + className,
959 llvm::GlobalValue::LinkOnceODRLinkage);
960 return llvm::ConstantExpr::getBitCast(TI, PtrToInt8Ty);
963 /// Generate an NSConstantString object.
964 llvm::Constant *CGObjCGNU::GenerateConstantString(const StringLiteral *SL) {
966 std::string Str = SL->getString().str();
968 // Look for an existing one
969 llvm::StringMap<llvm::Constant*>::iterator old = ObjCStrings.find(Str);
970 if (old != ObjCStrings.end())
971 return old->getValue();
973 std::vector<llvm::Constant*> Ivars;
974 Ivars.push_back(NULLPtr);
975 Ivars.push_back(MakeConstantString(Str));
976 Ivars.push_back(llvm::ConstantInt::get(IntTy, Str.size()));
977 llvm::Constant *ObjCStr = MakeGlobal(
978 llvm::StructType::get(PtrToInt8Ty, PtrToInt8Ty, IntTy, NULL),
980 ObjCStr = llvm::ConstantExpr::getBitCast(ObjCStr, PtrToInt8Ty);
981 ObjCStrings[Str] = ObjCStr;
982 ConstantStrings.push_back(ObjCStr);
986 ///Generates a message send where the super is the receiver. This is a message
987 ///send to self with special delivery semantics indicating which class's method
990 CGObjCGNU::GenerateMessageSendSuper(CodeGenFunction &CGF,
991 ReturnValueSlot Return,
994 const ObjCInterfaceDecl *Class,
996 llvm::Value *Receiver,
998 const CallArgList &CallArgs,
999 const ObjCMethodDecl *Method) {
1000 CGBuilderTy &Builder = CGF.Builder;
1001 if (CGM.getLangOptions().getGC() == LangOptions::GCOnly) {
1002 if (Sel == RetainSel || Sel == AutoreleaseSel) {
1003 return RValue::get(EnforceType(Builder, Receiver,
1004 CGM.getTypes().ConvertType(ResultType)));
1006 if (Sel == ReleaseSel) {
1007 return RValue::get(0);
1011 llvm::Value *cmd = GetSelector(Builder, Sel);
1014 CallArgList ActualArgs;
1016 ActualArgs.add(RValue::get(EnforceType(Builder, Receiver, IdTy)), ASTIdTy);
1017 ActualArgs.add(RValue::get(cmd), CGF.getContext().getObjCSelType());
1018 ActualArgs.addFrom(CallArgs);
1020 CodeGenTypes &Types = CGM.getTypes();
1021 const CGFunctionInfo &FnInfo = Types.getFunctionInfo(ResultType, ActualArgs,
1022 FunctionType::ExtInfo());
1024 llvm::Value *ReceiverClass = 0;
1025 if (isCategoryImpl) {
1026 llvm::Constant *classLookupFunction = 0;
1027 if (IsClassMessage) {
1028 classLookupFunction = CGM.CreateRuntimeFunction(llvm::FunctionType::get(
1029 IdTy, PtrTy, true), "objc_get_meta_class");
1031 classLookupFunction = CGM.CreateRuntimeFunction(llvm::FunctionType::get(
1032 IdTy, PtrTy, true), "objc_get_class");
1034 ReceiverClass = Builder.CreateCall(classLookupFunction,
1035 MakeConstantString(Class->getNameAsString()));
1037 // Set up global aliases for the metaclass or class pointer if they do not
1038 // already exist. These will are forward-references which will be set to
1039 // pointers to the class and metaclass structure created for the runtime
1040 // load function. To send a message to super, we look up the value of the
1041 // super_class pointer from either the class or metaclass structure.
1042 if (IsClassMessage) {
1043 if (!MetaClassPtrAlias) {
1044 MetaClassPtrAlias = new llvm::GlobalAlias(IdTy,
1045 llvm::GlobalValue::InternalLinkage, ".objc_metaclass_ref" +
1046 Class->getNameAsString(), NULL, &TheModule);
1048 ReceiverClass = MetaClassPtrAlias;
1050 if (!ClassPtrAlias) {
1051 ClassPtrAlias = new llvm::GlobalAlias(IdTy,
1052 llvm::GlobalValue::InternalLinkage, ".objc_class_ref" +
1053 Class->getNameAsString(), NULL, &TheModule);
1055 ReceiverClass = ClassPtrAlias;
1058 // Cast the pointer to a simplified version of the class structure
1059 ReceiverClass = Builder.CreateBitCast(ReceiverClass,
1060 llvm::PointerType::getUnqual(
1061 llvm::StructType::get(IdTy, IdTy, NULL)));
1062 // Get the superclass pointer
1063 ReceiverClass = Builder.CreateStructGEP(ReceiverClass, 1);
1064 // Load the superclass pointer
1065 ReceiverClass = Builder.CreateLoad(ReceiverClass);
1066 // Construct the structure used to look up the IMP
1067 llvm::StructType *ObjCSuperTy = llvm::StructType::get(
1068 Receiver->getType(), IdTy, NULL);
1069 llvm::Value *ObjCSuper = Builder.CreateAlloca(ObjCSuperTy);
1071 Builder.CreateStore(Receiver, Builder.CreateStructGEP(ObjCSuper, 0));
1072 Builder.CreateStore(ReceiverClass, Builder.CreateStructGEP(ObjCSuper, 1));
1074 ObjCSuper = EnforceType(Builder, ObjCSuper, PtrToObjCSuperTy);
1075 llvm::FunctionType *impType =
1076 Types.GetFunctionType(FnInfo, Method ? Method->isVariadic() : false);
1079 llvm::Value *imp = LookupIMPSuper(CGF, ObjCSuper, cmd);
1080 imp = EnforceType(Builder, imp, llvm::PointerType::getUnqual(impType));
1082 llvm::Value *impMD[] = {
1083 llvm::MDString::get(VMContext, Sel.getAsString()),
1084 llvm::MDString::get(VMContext, Class->getSuperClass()->getNameAsString()),
1085 llvm::ConstantInt::get(llvm::Type::getInt1Ty(VMContext), IsClassMessage)
1087 llvm::MDNode *node = llvm::MDNode::get(VMContext, impMD);
1089 llvm::Instruction *call;
1090 RValue msgRet = CGF.EmitCall(FnInfo, imp, Return, ActualArgs,
1092 call->setMetadata(msgSendMDKind, node);
1096 /// Generate code for a message send expression.
1098 CGObjCGNU::GenerateMessageSend(CodeGenFunction &CGF,
1099 ReturnValueSlot Return,
1100 QualType ResultType,
1102 llvm::Value *Receiver,
1103 const CallArgList &CallArgs,
1104 const ObjCInterfaceDecl *Class,
1105 const ObjCMethodDecl *Method) {
1106 CGBuilderTy &Builder = CGF.Builder;
1108 // Strip out message sends to retain / release in GC mode
1109 if (CGM.getLangOptions().getGC() == LangOptions::GCOnly) {
1110 if (Sel == RetainSel || Sel == AutoreleaseSel) {
1111 return RValue::get(EnforceType(Builder, Receiver,
1112 CGM.getTypes().ConvertType(ResultType)));
1114 if (Sel == ReleaseSel) {
1115 return RValue::get(0);
1119 // If the return type is something that goes in an integer register, the
1120 // runtime will handle 0 returns. For other cases, we fill in the 0 value
1123 // The language spec says the result of this kind of message send is
1124 // undefined, but lots of people seem to have forgotten to read that
1125 // paragraph and insist on sending messages to nil that have structure
1126 // returns. With GCC, this generates a random return value (whatever happens
1127 // to be on the stack / in those registers at the time) on most platforms,
1128 // and generates an illegal instruction trap on SPARC. With LLVM it corrupts
1130 bool isPointerSizedReturn = (ResultType->isAnyPointerType() ||
1131 ResultType->isIntegralOrEnumerationType() || ResultType->isVoidType());
1133 llvm::BasicBlock *startBB = 0;
1134 llvm::BasicBlock *messageBB = 0;
1135 llvm::BasicBlock *continueBB = 0;
1137 if (!isPointerSizedReturn) {
1138 startBB = Builder.GetInsertBlock();
1139 messageBB = CGF.createBasicBlock("msgSend");
1140 continueBB = CGF.createBasicBlock("continue");
1142 llvm::Value *isNil = Builder.CreateICmpEQ(Receiver,
1143 llvm::Constant::getNullValue(Receiver->getType()));
1144 Builder.CreateCondBr(isNil, continueBB, messageBB);
1145 CGF.EmitBlock(messageBB);
1148 IdTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(ASTIdTy));
1151 cmd = GetSelector(Builder, Method);
1153 cmd = GetSelector(Builder, Sel);
1154 cmd = EnforceType(Builder, cmd, SelectorTy);
1155 Receiver = EnforceType(Builder, Receiver, IdTy);
1157 llvm::Value *impMD[] = {
1158 llvm::MDString::get(VMContext, Sel.getAsString()),
1159 llvm::MDString::get(VMContext, Class ? Class->getNameAsString() :""),
1160 llvm::ConstantInt::get(llvm::Type::getInt1Ty(VMContext), Class!=0)
1162 llvm::MDNode *node = llvm::MDNode::get(VMContext, impMD);
1164 // Get the IMP to call
1165 llvm::Value *imp = LookupIMP(CGF, Receiver, cmd, node);
1167 CallArgList ActualArgs;
1168 ActualArgs.add(RValue::get(Receiver), ASTIdTy);
1169 ActualArgs.add(RValue::get(cmd), CGF.getContext().getObjCSelType());
1170 ActualArgs.addFrom(CallArgs);
1172 CodeGenTypes &Types = CGM.getTypes();
1173 const CGFunctionInfo &FnInfo = Types.getFunctionInfo(ResultType, ActualArgs,
1174 FunctionType::ExtInfo());
1175 llvm::FunctionType *impType =
1176 Types.GetFunctionType(FnInfo, Method ? Method->isVariadic() : false);
1177 imp = EnforceType(Builder, imp, llvm::PointerType::getUnqual(impType));
1180 // For sender-aware dispatch, we pass the sender as the third argument to a
1181 // lookup function. When sending messages from C code, the sender is nil.
1182 // objc_msg_lookup_sender(id *receiver, SEL selector, id sender);
1183 llvm::Instruction *call;
1184 RValue msgRet = CGF.EmitCall(FnInfo, imp, Return, ActualArgs,
1186 call->setMetadata(msgSendMDKind, node);
1189 if (!isPointerSizedReturn) {
1190 messageBB = CGF.Builder.GetInsertBlock();
1191 CGF.Builder.CreateBr(continueBB);
1192 CGF.EmitBlock(continueBB);
1193 if (msgRet.isScalar()) {
1194 llvm::Value *v = msgRet.getScalarVal();
1195 llvm::PHINode *phi = Builder.CreatePHI(v->getType(), 2);
1196 phi->addIncoming(v, messageBB);
1197 phi->addIncoming(llvm::Constant::getNullValue(v->getType()), startBB);
1198 msgRet = RValue::get(phi);
1199 } else if (msgRet.isAggregate()) {
1200 llvm::Value *v = msgRet.getAggregateAddr();
1201 llvm::PHINode *phi = Builder.CreatePHI(v->getType(), 2);
1202 llvm::PointerType *RetTy = cast<llvm::PointerType>(v->getType());
1203 llvm::AllocaInst *NullVal =
1204 CGF.CreateTempAlloca(RetTy->getElementType(), "null");
1205 CGF.InitTempAlloca(NullVal,
1206 llvm::Constant::getNullValue(RetTy->getElementType()));
1207 phi->addIncoming(v, messageBB);
1208 phi->addIncoming(NullVal, startBB);
1209 msgRet = RValue::getAggregate(phi);
1210 } else /* isComplex() */ {
1211 std::pair<llvm::Value*,llvm::Value*> v = msgRet.getComplexVal();
1212 llvm::PHINode *phi = Builder.CreatePHI(v.first->getType(), 2);
1213 phi->addIncoming(v.first, messageBB);
1214 phi->addIncoming(llvm::Constant::getNullValue(v.first->getType()),
1216 llvm::PHINode *phi2 = Builder.CreatePHI(v.second->getType(), 2);
1217 phi2->addIncoming(v.second, messageBB);
1218 phi2->addIncoming(llvm::Constant::getNullValue(v.second->getType()),
1220 msgRet = RValue::getComplex(phi, phi2);
1226 /// Generates a MethodList. Used in construction of a objc_class and
1227 /// objc_category structures.
1228 llvm::Constant *CGObjCGNU::GenerateMethodList(const StringRef &ClassName,
1229 const StringRef &CategoryName,
1230 const SmallVectorImpl<Selector> &MethodSels,
1231 const SmallVectorImpl<llvm::Constant *> &MethodTypes,
1232 bool isClassMethodList) {
1233 if (MethodSels.empty())
1235 // Get the method structure type.
1236 llvm::StructType *ObjCMethodTy = llvm::StructType::get(
1237 PtrToInt8Ty, // Really a selector, but the runtime creates it us.
1238 PtrToInt8Ty, // Method types
1239 IMPTy, //Method pointer
1241 std::vector<llvm::Constant*> Methods;
1242 std::vector<llvm::Constant*> Elements;
1243 for (unsigned int i = 0, e = MethodTypes.size(); i < e; ++i) {
1245 llvm::Constant *Method =
1246 TheModule.getFunction(SymbolNameForMethod(ClassName, CategoryName,
1248 isClassMethodList));
1249 assert(Method && "Can't generate metadata for method that doesn't exist");
1250 llvm::Constant *C = MakeConstantString(MethodSels[i].getAsString());
1251 Elements.push_back(C);
1252 Elements.push_back(MethodTypes[i]);
1253 Method = llvm::ConstantExpr::getBitCast(Method,
1255 Elements.push_back(Method);
1256 Methods.push_back(llvm::ConstantStruct::get(ObjCMethodTy, Elements));
1259 // Array of method structures
1260 llvm::ArrayType *ObjCMethodArrayTy = llvm::ArrayType::get(ObjCMethodTy,
1262 llvm::Constant *MethodArray = llvm::ConstantArray::get(ObjCMethodArrayTy,
1265 // Structure containing list pointer, array and array count
1266 llvm::StructType *ObjCMethodListTy = llvm::StructType::create(VMContext);
1267 llvm::Type *NextPtrTy = llvm::PointerType::getUnqual(ObjCMethodListTy);
1268 ObjCMethodListTy->setBody(
1275 Methods.push_back(llvm::ConstantPointerNull::get(
1276 llvm::PointerType::getUnqual(ObjCMethodListTy)));
1277 Methods.push_back(llvm::ConstantInt::get(Int32Ty, MethodTypes.size()));
1278 Methods.push_back(MethodArray);
1280 // Create an instance of the structure
1281 return MakeGlobal(ObjCMethodListTy, Methods, ".objc_method_list");
1284 /// Generates an IvarList. Used in construction of a objc_class.
1285 llvm::Constant *CGObjCGNU::GenerateIvarList(
1286 const SmallVectorImpl<llvm::Constant *> &IvarNames,
1287 const SmallVectorImpl<llvm::Constant *> &IvarTypes,
1288 const SmallVectorImpl<llvm::Constant *> &IvarOffsets) {
1289 if (IvarNames.size() == 0)
1291 // Get the method structure type.
1292 llvm::StructType *ObjCIvarTy = llvm::StructType::get(
1297 std::vector<llvm::Constant*> Ivars;
1298 std::vector<llvm::Constant*> Elements;
1299 for (unsigned int i = 0, e = IvarNames.size() ; i < e ; i++) {
1301 Elements.push_back(IvarNames[i]);
1302 Elements.push_back(IvarTypes[i]);
1303 Elements.push_back(IvarOffsets[i]);
1304 Ivars.push_back(llvm::ConstantStruct::get(ObjCIvarTy, Elements));
1307 // Array of method structures
1308 llvm::ArrayType *ObjCIvarArrayTy = llvm::ArrayType::get(ObjCIvarTy,
1313 Elements.push_back(llvm::ConstantInt::get(IntTy, (int)IvarNames.size()));
1314 Elements.push_back(llvm::ConstantArray::get(ObjCIvarArrayTy, Ivars));
1315 // Structure containing array and array count
1316 llvm::StructType *ObjCIvarListTy = llvm::StructType::get(IntTy,
1320 // Create an instance of the structure
1321 return MakeGlobal(ObjCIvarListTy, Elements, ".objc_ivar_list");
1324 /// Generate a class structure
1325 llvm::Constant *CGObjCGNU::GenerateClassStructure(
1326 llvm::Constant *MetaClass,
1327 llvm::Constant *SuperClass,
1330 llvm::Constant *Version,
1331 llvm::Constant *InstanceSize,
1332 llvm::Constant *IVars,
1333 llvm::Constant *Methods,
1334 llvm::Constant *Protocols,
1335 llvm::Constant *IvarOffsets,
1336 llvm::Constant *Properties,
1337 llvm::Constant *StrongIvarBitmap,
1338 llvm::Constant *WeakIvarBitmap,
1340 // Set up the class structure
1341 // Note: Several of these are char*s when they should be ids. This is
1342 // because the runtime performs this translation on load.
1344 // Fields marked New ABI are part of the GNUstep runtime. We emit them
1345 // anyway; the classes will still work with the GNU runtime, they will just
1347 llvm::StructType *ClassTy = llvm::StructType::get(
1348 PtrToInt8Ty, // class_pointer
1349 PtrToInt8Ty, // super_class
1350 PtrToInt8Ty, // name
1353 LongTy, // instance_size
1354 IVars->getType(), // ivars
1355 Methods->getType(), // methods
1356 // These are all filled in by the runtime, so we pretend
1358 PtrTy, // subclass_list
1359 PtrTy, // sibling_class
1361 PtrTy, // gc_object_type
1363 LongTy, // abi_version
1364 IvarOffsets->getType(), // ivar_offsets
1365 Properties->getType(), // properties
1366 IntPtrTy, // strong_pointers
1367 IntPtrTy, // weak_pointers
1369 llvm::Constant *Zero = llvm::ConstantInt::get(LongTy, 0);
1370 // Fill in the structure
1371 std::vector<llvm::Constant*> Elements;
1372 Elements.push_back(llvm::ConstantExpr::getBitCast(MetaClass, PtrToInt8Ty));
1373 Elements.push_back(SuperClass);
1374 Elements.push_back(MakeConstantString(Name, ".class_name"));
1375 Elements.push_back(Zero);
1376 Elements.push_back(llvm::ConstantInt::get(LongTy, info));
1378 llvm::TargetData td(&TheModule);
1380 llvm::ConstantInt::get(LongTy,
1381 td.getTypeSizeInBits(ClassTy) /
1382 CGM.getContext().getCharWidth()));
1384 Elements.push_back(InstanceSize);
1385 Elements.push_back(IVars);
1386 Elements.push_back(Methods);
1387 Elements.push_back(NULLPtr);
1388 Elements.push_back(NULLPtr);
1389 Elements.push_back(NULLPtr);
1390 Elements.push_back(llvm::ConstantExpr::getBitCast(Protocols, PtrTy));
1391 Elements.push_back(NULLPtr);
1392 Elements.push_back(llvm::ConstantInt::get(LongTy, 1));
1393 Elements.push_back(IvarOffsets);
1394 Elements.push_back(Properties);
1395 Elements.push_back(StrongIvarBitmap);
1396 Elements.push_back(WeakIvarBitmap);
1397 // Create an instance of the structure
1398 // This is now an externally visible symbol, so that we can speed up class
1399 // messages in the next ABI.
1400 return MakeGlobal(ClassTy, Elements, (isMeta ? "_OBJC_METACLASS_":
1401 "_OBJC_CLASS_") + std::string(Name), llvm::GlobalValue::ExternalLinkage);
1404 llvm::Constant *CGObjCGNU::GenerateProtocolMethodList(
1405 const SmallVectorImpl<llvm::Constant *> &MethodNames,
1406 const SmallVectorImpl<llvm::Constant *> &MethodTypes) {
1407 // Get the method structure type.
1408 llvm::StructType *ObjCMethodDescTy = llvm::StructType::get(
1409 PtrToInt8Ty, // Really a selector, but the runtime does the casting for us.
1412 std::vector<llvm::Constant*> Methods;
1413 std::vector<llvm::Constant*> Elements;
1414 for (unsigned int i = 0, e = MethodTypes.size() ; i < e ; i++) {
1416 Elements.push_back(MethodNames[i]);
1417 Elements.push_back(MethodTypes[i]);
1418 Methods.push_back(llvm::ConstantStruct::get(ObjCMethodDescTy, Elements));
1420 llvm::ArrayType *ObjCMethodArrayTy = llvm::ArrayType::get(ObjCMethodDescTy,
1421 MethodNames.size());
1422 llvm::Constant *Array = llvm::ConstantArray::get(ObjCMethodArrayTy,
1424 llvm::StructType *ObjCMethodDescListTy = llvm::StructType::get(
1425 IntTy, ObjCMethodArrayTy, NULL);
1427 Methods.push_back(llvm::ConstantInt::get(IntTy, MethodNames.size()));
1428 Methods.push_back(Array);
1429 return MakeGlobal(ObjCMethodDescListTy, Methods, ".objc_method_list");
1432 // Create the protocol list structure used in classes, categories and so on
1433 llvm::Constant *CGObjCGNU::GenerateProtocolList(
1434 const SmallVectorImpl<std::string> &Protocols) {
1435 llvm::ArrayType *ProtocolArrayTy = llvm::ArrayType::get(PtrToInt8Ty,
1437 llvm::StructType *ProtocolListTy = llvm::StructType::get(
1438 PtrTy, //Should be a recurisve pointer, but it's always NULL here.
1442 std::vector<llvm::Constant*> Elements;
1443 for (const std::string *iter = Protocols.begin(), *endIter = Protocols.end();
1444 iter != endIter ; iter++) {
1445 llvm::Constant *protocol = 0;
1446 llvm::StringMap<llvm::Constant*>::iterator value =
1447 ExistingProtocols.find(*iter);
1448 if (value == ExistingProtocols.end()) {
1449 protocol = GenerateEmptyProtocol(*iter);
1451 protocol = value->getValue();
1453 llvm::Constant *Ptr = llvm::ConstantExpr::getBitCast(protocol,
1455 Elements.push_back(Ptr);
1457 llvm::Constant * ProtocolArray = llvm::ConstantArray::get(ProtocolArrayTy,
1460 Elements.push_back(NULLPtr);
1461 Elements.push_back(llvm::ConstantInt::get(LongTy, Protocols.size()));
1462 Elements.push_back(ProtocolArray);
1463 return MakeGlobal(ProtocolListTy, Elements, ".objc_protocol_list");
1466 llvm::Value *CGObjCGNU::GenerateProtocolRef(CGBuilderTy &Builder,
1467 const ObjCProtocolDecl *PD) {
1468 llvm::Value *protocol = ExistingProtocols[PD->getNameAsString()];
1470 CGM.getTypes().ConvertType(CGM.getContext().getObjCProtoType());
1471 return Builder.CreateBitCast(protocol, llvm::PointerType::getUnqual(T));
1474 llvm::Constant *CGObjCGNU::GenerateEmptyProtocol(
1475 const std::string &ProtocolName) {
1476 SmallVector<std::string, 0> EmptyStringVector;
1477 SmallVector<llvm::Constant*, 0> EmptyConstantVector;
1479 llvm::Constant *ProtocolList = GenerateProtocolList(EmptyStringVector);
1480 llvm::Constant *MethodList =
1481 GenerateProtocolMethodList(EmptyConstantVector, EmptyConstantVector);
1482 // Protocols are objects containing lists of the methods implemented and
1483 // protocols adopted.
1484 llvm::StructType *ProtocolTy = llvm::StructType::get(IdTy,
1486 ProtocolList->getType(),
1487 MethodList->getType(),
1488 MethodList->getType(),
1489 MethodList->getType(),
1490 MethodList->getType(),
1492 std::vector<llvm::Constant*> Elements;
1493 // The isa pointer must be set to a magic number so the runtime knows it's
1494 // the correct layout.
1495 Elements.push_back(llvm::ConstantExpr::getIntToPtr(
1496 llvm::ConstantInt::get(Int32Ty, ProtocolVersion), IdTy));
1497 Elements.push_back(MakeConstantString(ProtocolName, ".objc_protocol_name"));
1498 Elements.push_back(ProtocolList);
1499 Elements.push_back(MethodList);
1500 Elements.push_back(MethodList);
1501 Elements.push_back(MethodList);
1502 Elements.push_back(MethodList);
1503 return MakeGlobal(ProtocolTy, Elements, ".objc_protocol");
1506 void CGObjCGNU::GenerateProtocol(const ObjCProtocolDecl *PD) {
1507 ASTContext &Context = CGM.getContext();
1508 std::string ProtocolName = PD->getNameAsString();
1509 SmallVector<std::string, 16> Protocols;
1510 for (ObjCProtocolDecl::protocol_iterator PI = PD->protocol_begin(),
1511 E = PD->protocol_end(); PI != E; ++PI)
1512 Protocols.push_back((*PI)->getNameAsString());
1513 SmallVector<llvm::Constant*, 16> InstanceMethodNames;
1514 SmallVector<llvm::Constant*, 16> InstanceMethodTypes;
1515 SmallVector<llvm::Constant*, 16> OptionalInstanceMethodNames;
1516 SmallVector<llvm::Constant*, 16> OptionalInstanceMethodTypes;
1517 for (ObjCProtocolDecl::instmeth_iterator iter = PD->instmeth_begin(),
1518 E = PD->instmeth_end(); iter != E; iter++) {
1519 std::string TypeStr;
1520 Context.getObjCEncodingForMethodDecl(*iter, TypeStr);
1521 if ((*iter)->getImplementationControl() == ObjCMethodDecl::Optional) {
1522 InstanceMethodNames.push_back(
1523 MakeConstantString((*iter)->getSelector().getAsString()));
1524 InstanceMethodTypes.push_back(MakeConstantString(TypeStr));
1526 OptionalInstanceMethodNames.push_back(
1527 MakeConstantString((*iter)->getSelector().getAsString()));
1528 OptionalInstanceMethodTypes.push_back(MakeConstantString(TypeStr));
1531 // Collect information about class methods:
1532 SmallVector<llvm::Constant*, 16> ClassMethodNames;
1533 SmallVector<llvm::Constant*, 16> ClassMethodTypes;
1534 SmallVector<llvm::Constant*, 16> OptionalClassMethodNames;
1535 SmallVector<llvm::Constant*, 16> OptionalClassMethodTypes;
1536 for (ObjCProtocolDecl::classmeth_iterator
1537 iter = PD->classmeth_begin(), endIter = PD->classmeth_end();
1538 iter != endIter ; iter++) {
1539 std::string TypeStr;
1540 Context.getObjCEncodingForMethodDecl((*iter),TypeStr);
1541 if ((*iter)->getImplementationControl() == ObjCMethodDecl::Optional) {
1542 ClassMethodNames.push_back(
1543 MakeConstantString((*iter)->getSelector().getAsString()));
1544 ClassMethodTypes.push_back(MakeConstantString(TypeStr));
1546 OptionalClassMethodNames.push_back(
1547 MakeConstantString((*iter)->getSelector().getAsString()));
1548 OptionalClassMethodTypes.push_back(MakeConstantString(TypeStr));
1552 llvm::Constant *ProtocolList = GenerateProtocolList(Protocols);
1553 llvm::Constant *InstanceMethodList =
1554 GenerateProtocolMethodList(InstanceMethodNames, InstanceMethodTypes);
1555 llvm::Constant *ClassMethodList =
1556 GenerateProtocolMethodList(ClassMethodNames, ClassMethodTypes);
1557 llvm::Constant *OptionalInstanceMethodList =
1558 GenerateProtocolMethodList(OptionalInstanceMethodNames,
1559 OptionalInstanceMethodTypes);
1560 llvm::Constant *OptionalClassMethodList =
1561 GenerateProtocolMethodList(OptionalClassMethodNames,
1562 OptionalClassMethodTypes);
1564 // Property metadata: name, attributes, isSynthesized, setter name, setter
1565 // types, getter name, getter types.
1566 // The isSynthesized value is always set to 0 in a protocol. It exists to
1567 // simplify the runtime library by allowing it to use the same data
1568 // structures for protocol metadata everywhere.
1569 llvm::StructType *PropertyMetadataTy = llvm::StructType::get(
1570 PtrToInt8Ty, Int8Ty, Int8Ty, PtrToInt8Ty, PtrToInt8Ty, PtrToInt8Ty,
1572 std::vector<llvm::Constant*> Properties;
1573 std::vector<llvm::Constant*> OptionalProperties;
1575 // Add all of the property methods need adding to the method list and to the
1576 // property metadata list.
1577 for (ObjCContainerDecl::prop_iterator
1578 iter = PD->prop_begin(), endIter = PD->prop_end();
1579 iter != endIter ; iter++) {
1580 std::vector<llvm::Constant*> Fields;
1581 ObjCPropertyDecl *property = (*iter);
1583 Fields.push_back(MakeConstantString(property->getNameAsString()));
1584 Fields.push_back(llvm::ConstantInt::get(Int8Ty,
1585 property->getPropertyAttributes()));
1586 Fields.push_back(llvm::ConstantInt::get(Int8Ty, 0));
1587 if (ObjCMethodDecl *getter = property->getGetterMethodDecl()) {
1588 std::string TypeStr;
1589 Context.getObjCEncodingForMethodDecl(getter,TypeStr);
1590 llvm::Constant *TypeEncoding = MakeConstantString(TypeStr);
1591 InstanceMethodTypes.push_back(TypeEncoding);
1592 Fields.push_back(MakeConstantString(getter->getSelector().getAsString()));
1593 Fields.push_back(TypeEncoding);
1595 Fields.push_back(NULLPtr);
1596 Fields.push_back(NULLPtr);
1598 if (ObjCMethodDecl *setter = property->getSetterMethodDecl()) {
1599 std::string TypeStr;
1600 Context.getObjCEncodingForMethodDecl(setter,TypeStr);
1601 llvm::Constant *TypeEncoding = MakeConstantString(TypeStr);
1602 InstanceMethodTypes.push_back(TypeEncoding);
1603 Fields.push_back(MakeConstantString(setter->getSelector().getAsString()));
1604 Fields.push_back(TypeEncoding);
1606 Fields.push_back(NULLPtr);
1607 Fields.push_back(NULLPtr);
1609 if (property->getPropertyImplementation() == ObjCPropertyDecl::Optional) {
1610 OptionalProperties.push_back(llvm::ConstantStruct::get(PropertyMetadataTy, Fields));
1612 Properties.push_back(llvm::ConstantStruct::get(PropertyMetadataTy, Fields));
1615 llvm::Constant *PropertyArray = llvm::ConstantArray::get(
1616 llvm::ArrayType::get(PropertyMetadataTy, Properties.size()), Properties);
1617 llvm::Constant* PropertyListInitFields[] =
1618 {llvm::ConstantInt::get(IntTy, Properties.size()), NULLPtr, PropertyArray};
1620 llvm::Constant *PropertyListInit =
1621 llvm::ConstantStruct::getAnon(PropertyListInitFields);
1622 llvm::Constant *PropertyList = new llvm::GlobalVariable(TheModule,
1623 PropertyListInit->getType(), false, llvm::GlobalValue::InternalLinkage,
1624 PropertyListInit, ".objc_property_list");
1626 llvm::Constant *OptionalPropertyArray =
1627 llvm::ConstantArray::get(llvm::ArrayType::get(PropertyMetadataTy,
1628 OptionalProperties.size()) , OptionalProperties);
1629 llvm::Constant* OptionalPropertyListInitFields[] = {
1630 llvm::ConstantInt::get(IntTy, OptionalProperties.size()), NULLPtr,
1631 OptionalPropertyArray };
1633 llvm::Constant *OptionalPropertyListInit =
1634 llvm::ConstantStruct::getAnon(OptionalPropertyListInitFields);
1635 llvm::Constant *OptionalPropertyList = new llvm::GlobalVariable(TheModule,
1636 OptionalPropertyListInit->getType(), false,
1637 llvm::GlobalValue::InternalLinkage, OptionalPropertyListInit,
1638 ".objc_property_list");
1640 // Protocols are objects containing lists of the methods implemented and
1641 // protocols adopted.
1642 llvm::StructType *ProtocolTy = llvm::StructType::get(IdTy,
1644 ProtocolList->getType(),
1645 InstanceMethodList->getType(),
1646 ClassMethodList->getType(),
1647 OptionalInstanceMethodList->getType(),
1648 OptionalClassMethodList->getType(),
1649 PropertyList->getType(),
1650 OptionalPropertyList->getType(),
1652 std::vector<llvm::Constant*> Elements;
1653 // The isa pointer must be set to a magic number so the runtime knows it's
1654 // the correct layout.
1655 Elements.push_back(llvm::ConstantExpr::getIntToPtr(
1656 llvm::ConstantInt::get(Int32Ty, ProtocolVersion), IdTy));
1657 Elements.push_back(MakeConstantString(ProtocolName, ".objc_protocol_name"));
1658 Elements.push_back(ProtocolList);
1659 Elements.push_back(InstanceMethodList);
1660 Elements.push_back(ClassMethodList);
1661 Elements.push_back(OptionalInstanceMethodList);
1662 Elements.push_back(OptionalClassMethodList);
1663 Elements.push_back(PropertyList);
1664 Elements.push_back(OptionalPropertyList);
1665 ExistingProtocols[ProtocolName] =
1666 llvm::ConstantExpr::getBitCast(MakeGlobal(ProtocolTy, Elements,
1667 ".objc_protocol"), IdTy);
1669 void CGObjCGNU::GenerateProtocolHolderCategory(void) {
1670 // Collect information about instance methods
1671 SmallVector<Selector, 1> MethodSels;
1672 SmallVector<llvm::Constant*, 1> MethodTypes;
1674 std::vector<llvm::Constant*> Elements;
1675 const std::string ClassName = "__ObjC_Protocol_Holder_Ugly_Hack";
1676 const std::string CategoryName = "AnotherHack";
1677 Elements.push_back(MakeConstantString(CategoryName));
1678 Elements.push_back(MakeConstantString(ClassName));
1679 // Instance method list
1680 Elements.push_back(llvm::ConstantExpr::getBitCast(GenerateMethodList(
1681 ClassName, CategoryName, MethodSels, MethodTypes, false), PtrTy));
1682 // Class method list
1683 Elements.push_back(llvm::ConstantExpr::getBitCast(GenerateMethodList(
1684 ClassName, CategoryName, MethodSels, MethodTypes, true), PtrTy));
1686 llvm::ArrayType *ProtocolArrayTy = llvm::ArrayType::get(PtrTy,
1687 ExistingProtocols.size());
1688 llvm::StructType *ProtocolListTy = llvm::StructType::get(
1689 PtrTy, //Should be a recurisve pointer, but it's always NULL here.
1693 std::vector<llvm::Constant*> ProtocolElements;
1694 for (llvm::StringMapIterator<llvm::Constant*> iter =
1695 ExistingProtocols.begin(), endIter = ExistingProtocols.end();
1696 iter != endIter ; iter++) {
1697 llvm::Constant *Ptr = llvm::ConstantExpr::getBitCast(iter->getValue(),
1699 ProtocolElements.push_back(Ptr);
1701 llvm::Constant * ProtocolArray = llvm::ConstantArray::get(ProtocolArrayTy,
1703 ProtocolElements.clear();
1704 ProtocolElements.push_back(NULLPtr);
1705 ProtocolElements.push_back(llvm::ConstantInt::get(LongTy,
1706 ExistingProtocols.size()));
1707 ProtocolElements.push_back(ProtocolArray);
1708 Elements.push_back(llvm::ConstantExpr::getBitCast(MakeGlobal(ProtocolListTy,
1709 ProtocolElements, ".objc_protocol_list"), PtrTy));
1710 Categories.push_back(llvm::ConstantExpr::getBitCast(
1711 MakeGlobal(llvm::StructType::get(PtrToInt8Ty, PtrToInt8Ty,
1712 PtrTy, PtrTy, PtrTy, NULL), Elements), PtrTy));
1715 /// Libobjc2 uses a bitfield representation where small(ish) bitfields are
1716 /// stored in a 64-bit value with the low bit set to 1 and the remaining 63
1717 /// bits set to their values, LSB first, while larger ones are stored in a
1718 /// structure of this / form:
1720 /// struct { int32_t length; int32_t values[length]; };
1722 /// The values in the array are stored in host-endian format, with the least
1723 /// significant bit being assumed to come first in the bitfield. Therefore, a
1724 /// bitfield with the 64th bit set will be (int64_t)&{ 2, [0, 1<<31] }, while a
1725 /// bitfield / with the 63rd bit set will be 1<<64.
1726 llvm::Constant *CGObjCGNU::MakeBitField(llvm::SmallVectorImpl<bool> &bits) {
1727 int bitCount = bits.size();
1729 (TheModule.getPointerSize() == llvm::Module::Pointer32) ? 32 : 64;
1730 if (bitCount < ptrBits) {
1732 for (int i=0 ; i<bitCount ; ++i) {
1733 if (bits[i]) val |= 1ULL<<(i+1);
1735 return llvm::ConstantInt::get(IntPtrTy, val);
1737 llvm::SmallVector<llvm::Constant*, 8> values;
1739 while (v < bitCount) {
1741 for (int i=0 ; (i<32) && (v<bitCount) ; ++i) {
1742 if (bits[v]) word |= 1<<i;
1745 values.push_back(llvm::ConstantInt::get(Int32Ty, word));
1747 llvm::ArrayType *arrayTy = llvm::ArrayType::get(Int32Ty, values.size());
1748 llvm::Constant *array = llvm::ConstantArray::get(arrayTy, values);
1749 llvm::Constant *fields[2] = {
1750 llvm::ConstantInt::get(Int32Ty, values.size()),
1752 llvm::Constant *GS = MakeGlobal(llvm::StructType::get(Int32Ty, arrayTy,
1754 llvm::Constant *ptr = llvm::ConstantExpr::getPtrToInt(GS, IntPtrTy);
1758 void CGObjCGNU::GenerateCategory(const ObjCCategoryImplDecl *OCD) {
1759 std::string ClassName = OCD->getClassInterface()->getNameAsString();
1760 std::string CategoryName = OCD->getNameAsString();
1761 // Collect information about instance methods
1762 SmallVector<Selector, 16> InstanceMethodSels;
1763 SmallVector<llvm::Constant*, 16> InstanceMethodTypes;
1764 for (ObjCCategoryImplDecl::instmeth_iterator
1765 iter = OCD->instmeth_begin(), endIter = OCD->instmeth_end();
1766 iter != endIter ; iter++) {
1767 InstanceMethodSels.push_back((*iter)->getSelector());
1768 std::string TypeStr;
1769 CGM.getContext().getObjCEncodingForMethodDecl(*iter,TypeStr);
1770 InstanceMethodTypes.push_back(MakeConstantString(TypeStr));
1773 // Collect information about class methods
1774 SmallVector<Selector, 16> ClassMethodSels;
1775 SmallVector<llvm::Constant*, 16> ClassMethodTypes;
1776 for (ObjCCategoryImplDecl::classmeth_iterator
1777 iter = OCD->classmeth_begin(), endIter = OCD->classmeth_end();
1778 iter != endIter ; iter++) {
1779 ClassMethodSels.push_back((*iter)->getSelector());
1780 std::string TypeStr;
1781 CGM.getContext().getObjCEncodingForMethodDecl(*iter,TypeStr);
1782 ClassMethodTypes.push_back(MakeConstantString(TypeStr));
1785 // Collect the names of referenced protocols
1786 SmallVector<std::string, 16> Protocols;
1787 const ObjCCategoryDecl *CatDecl = OCD->getCategoryDecl();
1788 const ObjCList<ObjCProtocolDecl> &Protos = CatDecl->getReferencedProtocols();
1789 for (ObjCList<ObjCProtocolDecl>::iterator I = Protos.begin(),
1790 E = Protos.end(); I != E; ++I)
1791 Protocols.push_back((*I)->getNameAsString());
1793 std::vector<llvm::Constant*> Elements;
1794 Elements.push_back(MakeConstantString(CategoryName));
1795 Elements.push_back(MakeConstantString(ClassName));
1796 // Instance method list
1797 Elements.push_back(llvm::ConstantExpr::getBitCast(GenerateMethodList(
1798 ClassName, CategoryName, InstanceMethodSels, InstanceMethodTypes,
1800 // Class method list
1801 Elements.push_back(llvm::ConstantExpr::getBitCast(GenerateMethodList(
1802 ClassName, CategoryName, ClassMethodSels, ClassMethodTypes, true),
1805 Elements.push_back(llvm::ConstantExpr::getBitCast(
1806 GenerateProtocolList(Protocols), PtrTy));
1807 Categories.push_back(llvm::ConstantExpr::getBitCast(
1808 MakeGlobal(llvm::StructType::get(PtrToInt8Ty, PtrToInt8Ty,
1809 PtrTy, PtrTy, PtrTy, NULL), Elements), PtrTy));
1812 llvm::Constant *CGObjCGNU::GeneratePropertyList(const ObjCImplementationDecl *OID,
1813 SmallVectorImpl<Selector> &InstanceMethodSels,
1814 SmallVectorImpl<llvm::Constant*> &InstanceMethodTypes) {
1815 ASTContext &Context = CGM.getContext();
1817 // Property metadata: name, attributes, isSynthesized, setter name, setter
1818 // types, getter name, getter types.
1819 llvm::StructType *PropertyMetadataTy = llvm::StructType::get(
1820 PtrToInt8Ty, Int8Ty, Int8Ty, PtrToInt8Ty, PtrToInt8Ty, PtrToInt8Ty,
1822 std::vector<llvm::Constant*> Properties;
1825 // Add all of the property methods need adding to the method list and to the
1826 // property metadata list.
1827 for (ObjCImplDecl::propimpl_iterator
1828 iter = OID->propimpl_begin(), endIter = OID->propimpl_end();
1829 iter != endIter ; iter++) {
1830 std::vector<llvm::Constant*> Fields;
1831 ObjCPropertyDecl *property = (*iter)->getPropertyDecl();
1832 ObjCPropertyImplDecl *propertyImpl = *iter;
1833 bool isSynthesized = (propertyImpl->getPropertyImplementation() ==
1834 ObjCPropertyImplDecl::Synthesize);
1836 Fields.push_back(MakeConstantString(property->getNameAsString()));
1837 Fields.push_back(llvm::ConstantInt::get(Int8Ty,
1838 property->getPropertyAttributes()));
1839 Fields.push_back(llvm::ConstantInt::get(Int8Ty, isSynthesized));
1840 if (ObjCMethodDecl *getter = property->getGetterMethodDecl()) {
1841 std::string TypeStr;
1842 Context.getObjCEncodingForMethodDecl(getter,TypeStr);
1843 llvm::Constant *TypeEncoding = MakeConstantString(TypeStr);
1844 if (isSynthesized) {
1845 InstanceMethodTypes.push_back(TypeEncoding);
1846 InstanceMethodSels.push_back(getter->getSelector());
1848 Fields.push_back(MakeConstantString(getter->getSelector().getAsString()));
1849 Fields.push_back(TypeEncoding);
1851 Fields.push_back(NULLPtr);
1852 Fields.push_back(NULLPtr);
1854 if (ObjCMethodDecl *setter = property->getSetterMethodDecl()) {
1855 std::string TypeStr;
1856 Context.getObjCEncodingForMethodDecl(setter,TypeStr);
1857 llvm::Constant *TypeEncoding = MakeConstantString(TypeStr);
1858 if (isSynthesized) {
1859 InstanceMethodTypes.push_back(TypeEncoding);
1860 InstanceMethodSels.push_back(setter->getSelector());
1862 Fields.push_back(MakeConstantString(setter->getSelector().getAsString()));
1863 Fields.push_back(TypeEncoding);
1865 Fields.push_back(NULLPtr);
1866 Fields.push_back(NULLPtr);
1868 Properties.push_back(llvm::ConstantStruct::get(PropertyMetadataTy, Fields));
1870 llvm::ArrayType *PropertyArrayTy =
1871 llvm::ArrayType::get(PropertyMetadataTy, Properties.size());
1872 llvm::Constant *PropertyArray = llvm::ConstantArray::get(PropertyArrayTy,
1874 llvm::Constant* PropertyListInitFields[] =
1875 {llvm::ConstantInt::get(IntTy, Properties.size()), NULLPtr, PropertyArray};
1877 llvm::Constant *PropertyListInit =
1878 llvm::ConstantStruct::getAnon(PropertyListInitFields);
1879 return new llvm::GlobalVariable(TheModule, PropertyListInit->getType(), false,
1880 llvm::GlobalValue::InternalLinkage, PropertyListInit,
1881 ".objc_property_list");
1884 void CGObjCGNU::GenerateClass(const ObjCImplementationDecl *OID) {
1885 ASTContext &Context = CGM.getContext();
1887 // Get the superclass name.
1888 const ObjCInterfaceDecl * SuperClassDecl =
1889 OID->getClassInterface()->getSuperClass();
1890 std::string SuperClassName;
1891 if (SuperClassDecl) {
1892 SuperClassName = SuperClassDecl->getNameAsString();
1893 EmitClassRef(SuperClassName);
1896 // Get the class name
1897 ObjCInterfaceDecl *ClassDecl =
1898 const_cast<ObjCInterfaceDecl *>(OID->getClassInterface());
1899 std::string ClassName = ClassDecl->getNameAsString();
1900 // Emit the symbol that is used to generate linker errors if this class is
1901 // referenced in other modules but not declared.
1902 std::string classSymbolName = "__objc_class_name_" + ClassName;
1903 if (llvm::GlobalVariable *symbol =
1904 TheModule.getGlobalVariable(classSymbolName)) {
1905 symbol->setInitializer(llvm::ConstantInt::get(LongTy, 0));
1907 new llvm::GlobalVariable(TheModule, LongTy, false,
1908 llvm::GlobalValue::ExternalLinkage, llvm::ConstantInt::get(LongTy, 0),
1912 // Get the size of instances.
1914 Context.getASTObjCImplementationLayout(OID).getSize().getQuantity();
1916 // Collect information about instance variables.
1917 SmallVector<llvm::Constant*, 16> IvarNames;
1918 SmallVector<llvm::Constant*, 16> IvarTypes;
1919 SmallVector<llvm::Constant*, 16> IvarOffsets;
1921 std::vector<llvm::Constant*> IvarOffsetValues;
1922 SmallVector<bool, 16> WeakIvars;
1923 SmallVector<bool, 16> StrongIvars;
1925 int superInstanceSize = !SuperClassDecl ? 0 :
1926 Context.getASTObjCInterfaceLayout(SuperClassDecl).getSize().getQuantity();
1927 // For non-fragile ivars, set the instance size to 0 - {the size of just this
1928 // class}. The runtime will then set this to the correct value on load.
1929 if (CGM.getContext().getLangOptions().ObjCNonFragileABI) {
1930 instanceSize = 0 - (instanceSize - superInstanceSize);
1933 for (const ObjCIvarDecl *IVD = ClassDecl->all_declared_ivar_begin(); IVD;
1934 IVD = IVD->getNextIvar()) {
1936 IvarNames.push_back(MakeConstantString(IVD->getNameAsString()));
1937 // Get the type encoding for this ivar
1938 std::string TypeStr;
1939 Context.getObjCEncodingForType(IVD->getType(), TypeStr);
1940 IvarTypes.push_back(MakeConstantString(TypeStr));
1942 uint64_t BaseOffset = ComputeIvarBaseOffset(CGM, OID, IVD);
1943 uint64_t Offset = BaseOffset;
1944 if (CGM.getContext().getLangOptions().ObjCNonFragileABI) {
1945 Offset = BaseOffset - superInstanceSize;
1947 llvm::Constant *OffsetValue = llvm::ConstantInt::get(IntTy, Offset);
1948 // Create the direct offset value
1949 std::string OffsetName = "__objc_ivar_offset_value_" + ClassName +"." +
1950 IVD->getNameAsString();
1951 llvm::GlobalVariable *OffsetVar = TheModule.getGlobalVariable(OffsetName);
1953 OffsetVar->setInitializer(OffsetValue);
1954 // If this is the real definition, change its linkage type so that
1955 // different modules will use this one, rather than their private
1957 OffsetVar->setLinkage(llvm::GlobalValue::ExternalLinkage);
1959 OffsetVar = new llvm::GlobalVariable(TheModule, IntTy,
1960 false, llvm::GlobalValue::ExternalLinkage,
1962 "__objc_ivar_offset_value_" + ClassName +"." +
1963 IVD->getNameAsString());
1964 IvarOffsets.push_back(OffsetValue);
1965 IvarOffsetValues.push_back(OffsetVar);
1966 Qualifiers::ObjCLifetime lt = IVD->getType().getQualifiers().getObjCLifetime();
1968 case Qualifiers::OCL_Strong:
1969 StrongIvars.push_back(true);
1970 WeakIvars.push_back(false);
1972 case Qualifiers::OCL_Weak:
1973 StrongIvars.push_back(false);
1974 WeakIvars.push_back(true);
1977 StrongIvars.push_back(false);
1978 WeakIvars.push_back(false);
1981 llvm::Constant *StrongIvarBitmap = MakeBitField(StrongIvars);
1982 llvm::Constant *WeakIvarBitmap = MakeBitField(WeakIvars);
1983 llvm::GlobalVariable *IvarOffsetArray =
1984 MakeGlobalArray(PtrToIntTy, IvarOffsetValues, ".ivar.offsets");
1987 // Collect information about instance methods
1988 SmallVector<Selector, 16> InstanceMethodSels;
1989 SmallVector<llvm::Constant*, 16> InstanceMethodTypes;
1990 for (ObjCImplementationDecl::instmeth_iterator
1991 iter = OID->instmeth_begin(), endIter = OID->instmeth_end();
1992 iter != endIter ; iter++) {
1993 InstanceMethodSels.push_back((*iter)->getSelector());
1994 std::string TypeStr;
1995 Context.getObjCEncodingForMethodDecl((*iter),TypeStr);
1996 InstanceMethodTypes.push_back(MakeConstantString(TypeStr));
1999 llvm::Constant *Properties = GeneratePropertyList(OID, InstanceMethodSels,
2000 InstanceMethodTypes);
2003 // Collect information about class methods
2004 SmallVector<Selector, 16> ClassMethodSels;
2005 SmallVector<llvm::Constant*, 16> ClassMethodTypes;
2006 for (ObjCImplementationDecl::classmeth_iterator
2007 iter = OID->classmeth_begin(), endIter = OID->classmeth_end();
2008 iter != endIter ; iter++) {
2009 ClassMethodSels.push_back((*iter)->getSelector());
2010 std::string TypeStr;
2011 Context.getObjCEncodingForMethodDecl((*iter),TypeStr);
2012 ClassMethodTypes.push_back(MakeConstantString(TypeStr));
2014 // Collect the names of referenced protocols
2015 SmallVector<std::string, 16> Protocols;
2016 const ObjCList<ObjCProtocolDecl> &Protos =ClassDecl->getReferencedProtocols();
2017 for (ObjCList<ObjCProtocolDecl>::iterator I = Protos.begin(),
2018 E = Protos.end(); I != E; ++I)
2019 Protocols.push_back((*I)->getNameAsString());
2023 // Get the superclass pointer.
2024 llvm::Constant *SuperClass;
2025 if (!SuperClassName.empty()) {
2026 SuperClass = MakeConstantString(SuperClassName, ".super_class_name");
2028 SuperClass = llvm::ConstantPointerNull::get(PtrToInt8Ty);
2030 // Empty vector used to construct empty method lists
2031 SmallVector<llvm::Constant*, 1> empty;
2032 // Generate the method and instance variable lists
2033 llvm::Constant *MethodList = GenerateMethodList(ClassName, "",
2034 InstanceMethodSels, InstanceMethodTypes, false);
2035 llvm::Constant *ClassMethodList = GenerateMethodList(ClassName, "",
2036 ClassMethodSels, ClassMethodTypes, true);
2037 llvm::Constant *IvarList = GenerateIvarList(IvarNames, IvarTypes,
2039 // Irrespective of whether we are compiling for a fragile or non-fragile ABI,
2040 // we emit a symbol containing the offset for each ivar in the class. This
2041 // allows code compiled for the non-Fragile ABI to inherit from code compiled
2042 // for the legacy ABI, without causing problems. The converse is also
2043 // possible, but causes all ivar accesses to be fragile.
2045 // Offset pointer for getting at the correct field in the ivar list when
2046 // setting up the alias. These are: The base address for the global, the
2047 // ivar array (second field), the ivar in this list (set for each ivar), and
2048 // the offset (third field in ivar structure)
2049 llvm::Type *IndexTy = Int32Ty;
2050 llvm::Constant *offsetPointerIndexes[] = {Zeros[0],
2051 llvm::ConstantInt::get(IndexTy, 1), 0,
2052 llvm::ConstantInt::get(IndexTy, 2) };
2054 unsigned ivarIndex = 0;
2055 for (const ObjCIvarDecl *IVD = ClassDecl->all_declared_ivar_begin(); IVD;
2056 IVD = IVD->getNextIvar()) {
2057 const std::string Name = "__objc_ivar_offset_" + ClassName + '.'
2058 + IVD->getNameAsString();
2059 offsetPointerIndexes[2] = llvm::ConstantInt::get(IndexTy, ivarIndex);
2060 // Get the correct ivar field
2061 llvm::Constant *offsetValue = llvm::ConstantExpr::getGetElementPtr(
2062 IvarList, offsetPointerIndexes);
2063 // Get the existing variable, if one exists.
2064 llvm::GlobalVariable *offset = TheModule.getNamedGlobal(Name);
2066 offset->setInitializer(offsetValue);
2067 // If this is the real definition, change its linkage type so that
2068 // different modules will use this one, rather than their private
2070 offset->setLinkage(llvm::GlobalValue::ExternalLinkage);
2072 // Add a new alias if there isn't one already.
2073 offset = new llvm::GlobalVariable(TheModule, offsetValue->getType(),
2074 false, llvm::GlobalValue::ExternalLinkage, offsetValue, Name);
2078 llvm::Constant *ZeroPtr = llvm::ConstantInt::get(IntPtrTy, 0);
2079 //Generate metaclass for class methods
2080 llvm::Constant *MetaClassStruct = GenerateClassStructure(NULLPtr,
2081 NULLPtr, 0x12L, ClassName.c_str(), 0, Zeros[0], GenerateIvarList(
2082 empty, empty, empty), ClassMethodList, NULLPtr,
2083 NULLPtr, NULLPtr, ZeroPtr, ZeroPtr, true);
2085 // Generate the class structure
2086 llvm::Constant *ClassStruct =
2087 GenerateClassStructure(MetaClassStruct, SuperClass, 0x11L,
2088 ClassName.c_str(), 0,
2089 llvm::ConstantInt::get(LongTy, instanceSize), IvarList,
2090 MethodList, GenerateProtocolList(Protocols), IvarOffsetArray,
2091 Properties, StrongIvarBitmap, WeakIvarBitmap);
2093 // Resolve the class aliases, if they exist.
2094 if (ClassPtrAlias) {
2095 ClassPtrAlias->replaceAllUsesWith(
2096 llvm::ConstantExpr::getBitCast(ClassStruct, IdTy));
2097 ClassPtrAlias->eraseFromParent();
2100 if (MetaClassPtrAlias) {
2101 MetaClassPtrAlias->replaceAllUsesWith(
2102 llvm::ConstantExpr::getBitCast(MetaClassStruct, IdTy));
2103 MetaClassPtrAlias->eraseFromParent();
2104 MetaClassPtrAlias = 0;
2107 // Add class structure to list to be added to the symtab later
2108 ClassStruct = llvm::ConstantExpr::getBitCast(ClassStruct, PtrToInt8Ty);
2109 Classes.push_back(ClassStruct);
2113 llvm::Function *CGObjCGNU::ModuleInitFunction() {
2114 // Only emit an ObjC load function if no Objective-C stuff has been called
2115 if (Classes.empty() && Categories.empty() && ConstantStrings.empty() &&
2116 ExistingProtocols.empty() && SelectorTable.empty())
2119 // Add all referenced protocols to a category.
2120 GenerateProtocolHolderCategory();
2122 llvm::StructType *SelStructTy = dyn_cast<llvm::StructType>(
2123 SelectorTy->getElementType());
2124 llvm::Type *SelStructPtrTy = SelectorTy;
2125 if (SelStructTy == 0) {
2126 SelStructTy = llvm::StructType::get(PtrToInt8Ty, PtrToInt8Ty, NULL);
2127 SelStructPtrTy = llvm::PointerType::getUnqual(SelStructTy);
2130 std::vector<llvm::Constant*> Elements;
2131 llvm::Constant *Statics = NULLPtr;
2132 // Generate statics list:
2133 if (ConstantStrings.size()) {
2134 llvm::ArrayType *StaticsArrayTy = llvm::ArrayType::get(PtrToInt8Ty,
2135 ConstantStrings.size() + 1);
2136 ConstantStrings.push_back(NULLPtr);
2138 StringRef StringClass = CGM.getLangOptions().ObjCConstantStringClass;
2140 if (StringClass.empty()) StringClass = "NXConstantString";
2142 Elements.push_back(MakeConstantString(StringClass,
2143 ".objc_static_class_name"));
2144 Elements.push_back(llvm::ConstantArray::get(StaticsArrayTy,
2146 llvm::StructType *StaticsListTy =
2147 llvm::StructType::get(PtrToInt8Ty, StaticsArrayTy, NULL);
2148 llvm::Type *StaticsListPtrTy =
2149 llvm::PointerType::getUnqual(StaticsListTy);
2150 Statics = MakeGlobal(StaticsListTy, Elements, ".objc_statics");
2151 llvm::ArrayType *StaticsListArrayTy =
2152 llvm::ArrayType::get(StaticsListPtrTy, 2);
2154 Elements.push_back(Statics);
2155 Elements.push_back(llvm::Constant::getNullValue(StaticsListPtrTy));
2156 Statics = MakeGlobal(StaticsListArrayTy, Elements, ".objc_statics_ptr");
2157 Statics = llvm::ConstantExpr::getBitCast(Statics, PtrTy);
2159 // Array of classes, categories, and constant objects
2160 llvm::ArrayType *ClassListTy = llvm::ArrayType::get(PtrToInt8Ty,
2161 Classes.size() + Categories.size() + 2);
2162 llvm::StructType *SymTabTy = llvm::StructType::get(LongTy, SelStructPtrTy,
2163 llvm::Type::getInt16Ty(VMContext),
2164 llvm::Type::getInt16Ty(VMContext),
2168 // Pointer to an array of selectors used in this module.
2169 std::vector<llvm::Constant*> Selectors;
2170 std::vector<llvm::GlobalAlias*> SelectorAliases;
2171 for (SelectorMap::iterator iter = SelectorTable.begin(),
2172 iterEnd = SelectorTable.end(); iter != iterEnd ; ++iter) {
2174 std::string SelNameStr = iter->first.getAsString();
2175 llvm::Constant *SelName = ExportUniqueString(SelNameStr, ".objc_sel_name");
2177 SmallVectorImpl<TypedSelector> &Types = iter->second;
2178 for (SmallVectorImpl<TypedSelector>::iterator i = Types.begin(),
2179 e = Types.end() ; i!=e ; i++) {
2181 llvm::Constant *SelectorTypeEncoding = NULLPtr;
2182 if (!i->first.empty())
2183 SelectorTypeEncoding = MakeConstantString(i->first, ".objc_sel_types");
2185 Elements.push_back(SelName);
2186 Elements.push_back(SelectorTypeEncoding);
2187 Selectors.push_back(llvm::ConstantStruct::get(SelStructTy, Elements));
2190 // Store the selector alias for later replacement
2191 SelectorAliases.push_back(i->second);
2194 unsigned SelectorCount = Selectors.size();
2195 // NULL-terminate the selector list. This should not actually be required,
2196 // because the selector list has a length field. Unfortunately, the GCC
2197 // runtime decides to ignore the length field and expects a NULL terminator,
2198 // and GCC cooperates with this by always setting the length to 0.
2199 Elements.push_back(NULLPtr);
2200 Elements.push_back(NULLPtr);
2201 Selectors.push_back(llvm::ConstantStruct::get(SelStructTy, Elements));
2204 // Number of static selectors
2205 Elements.push_back(llvm::ConstantInt::get(LongTy, SelectorCount));
2206 llvm::Constant *SelectorList = MakeGlobalArray(SelStructTy, Selectors,
2207 ".objc_selector_list");
2208 Elements.push_back(llvm::ConstantExpr::getBitCast(SelectorList,
2211 // Now that all of the static selectors exist, create pointers to them.
2212 for (unsigned int i=0 ; i<SelectorCount ; i++) {
2214 llvm::Constant *Idxs[] = {Zeros[0],
2215 llvm::ConstantInt::get(Int32Ty, i), Zeros[0]};
2216 // FIXME: We're generating redundant loads and stores here!
2217 llvm::Constant *SelPtr = llvm::ConstantExpr::getGetElementPtr(SelectorList,
2218 makeArrayRef(Idxs, 2));
2219 // If selectors are defined as an opaque type, cast the pointer to this
2221 SelPtr = llvm::ConstantExpr::getBitCast(SelPtr, SelectorTy);
2222 SelectorAliases[i]->replaceAllUsesWith(SelPtr);
2223 SelectorAliases[i]->eraseFromParent();
2226 // Number of classes defined.
2227 Elements.push_back(llvm::ConstantInt::get(llvm::Type::getInt16Ty(VMContext),
2229 // Number of categories defined
2230 Elements.push_back(llvm::ConstantInt::get(llvm::Type::getInt16Ty(VMContext),
2231 Categories.size()));
2232 // Create an array of classes, then categories, then static object instances
2233 Classes.insert(Classes.end(), Categories.begin(), Categories.end());
2234 // NULL-terminated list of static object instances (mainly constant strings)
2235 Classes.push_back(Statics);
2236 Classes.push_back(NULLPtr);
2237 llvm::Constant *ClassList = llvm::ConstantArray::get(ClassListTy, Classes);
2238 Elements.push_back(ClassList);
2239 // Construct the symbol table
2240 llvm::Constant *SymTab= MakeGlobal(SymTabTy, Elements);
2242 // The symbol table is contained in a module which has some version-checking
2244 llvm::StructType * ModuleTy = llvm::StructType::get(LongTy, LongTy,
2245 PtrToInt8Ty, llvm::PointerType::getUnqual(SymTabTy),
2246 (RuntimeVersion >= 10) ? IntTy : NULL, NULL);
2248 // Runtime version, used for ABI compatibility checking.
2249 Elements.push_back(llvm::ConstantInt::get(LongTy, RuntimeVersion));
2251 llvm::TargetData td(&TheModule);
2253 llvm::ConstantInt::get(LongTy,
2254 td.getTypeSizeInBits(ModuleTy) /
2255 CGM.getContext().getCharWidth()));
2257 // The path to the source file where this module was declared
2258 SourceManager &SM = CGM.getContext().getSourceManager();
2259 const FileEntry *mainFile = SM.getFileEntryForID(SM.getMainFileID());
2261 std::string(mainFile->getDir()->getName()) + '/' + mainFile->getName();
2262 Elements.push_back(MakeConstantString(path, ".objc_source_file_name"));
2263 Elements.push_back(SymTab);
2265 if (RuntimeVersion >= 10)
2266 switch (CGM.getLangOptions().getGC()) {
2267 case LangOptions::GCOnly:
2268 Elements.push_back(llvm::ConstantInt::get(IntTy, 2));
2270 case LangOptions::NonGC:
2271 if (CGM.getLangOptions().ObjCAutoRefCount)
2272 Elements.push_back(llvm::ConstantInt::get(IntTy, 1));
2274 Elements.push_back(llvm::ConstantInt::get(IntTy, 0));
2276 case LangOptions::HybridGC:
2277 Elements.push_back(llvm::ConstantInt::get(IntTy, 1));
2281 llvm::Value *Module = MakeGlobal(ModuleTy, Elements);
2283 // Create the load function calling the runtime entry point with the module
2285 llvm::Function * LoadFunction = llvm::Function::Create(
2286 llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), false),
2287 llvm::GlobalValue::InternalLinkage, ".objc_load_function",
2289 llvm::BasicBlock *EntryBB =
2290 llvm::BasicBlock::Create(VMContext, "entry", LoadFunction);
2291 CGBuilderTy Builder(VMContext);
2292 Builder.SetInsertPoint(EntryBB);
2294 llvm::FunctionType *FT =
2295 llvm::FunctionType::get(Builder.getVoidTy(),
2296 llvm::PointerType::getUnqual(ModuleTy), true);
2297 llvm::Value *Register = CGM.CreateRuntimeFunction(FT, "__objc_exec_class");
2298 Builder.CreateCall(Register, Module);
2299 Builder.CreateRetVoid();
2301 return LoadFunction;
2304 llvm::Function *CGObjCGNU::GenerateMethod(const ObjCMethodDecl *OMD,
2305 const ObjCContainerDecl *CD) {
2306 const ObjCCategoryImplDecl *OCD =
2307 dyn_cast<ObjCCategoryImplDecl>(OMD->getDeclContext());
2308 StringRef CategoryName = OCD ? OCD->getName() : "";
2309 StringRef ClassName = CD->getName();
2310 Selector MethodName = OMD->getSelector();
2311 bool isClassMethod = !OMD->isInstanceMethod();
2313 CodeGenTypes &Types = CGM.getTypes();
2314 llvm::FunctionType *MethodTy =
2315 Types.GetFunctionType(Types.getFunctionInfo(OMD), OMD->isVariadic());
2316 std::string FunctionName = SymbolNameForMethod(ClassName, CategoryName,
2317 MethodName, isClassMethod);
2319 llvm::Function *Method
2320 = llvm::Function::Create(MethodTy,
2321 llvm::GlobalValue::InternalLinkage,
2327 llvm::Constant *CGObjCGNU::GetPropertyGetFunction() {
2328 return GetPropertyFn;
2331 llvm::Constant *CGObjCGNU::GetPropertySetFunction() {
2332 return SetPropertyFn;
2335 llvm::Constant *CGObjCGNU::GetGetStructFunction() {
2336 return GetStructPropertyFn;
2338 llvm::Constant *CGObjCGNU::GetSetStructFunction() {
2339 return SetStructPropertyFn;
2342 llvm::Constant *CGObjCGNU::EnumerationMutationFunction() {
2343 return EnumerationMutationFn;
2346 void CGObjCGNU::EmitSynchronizedStmt(CodeGenFunction &CGF,
2347 const ObjCAtSynchronizedStmt &S) {
2348 EmitAtSynchronizedStmt(CGF, S, SyncEnterFn, SyncExitFn);
2352 void CGObjCGNU::EmitTryStmt(CodeGenFunction &CGF,
2353 const ObjCAtTryStmt &S) {
2354 // Unlike the Apple non-fragile runtimes, which also uses
2355 // unwind-based zero cost exceptions, the GNU Objective C runtime's
2356 // EH support isn't a veneer over C++ EH. Instead, exception
2357 // objects are created by __objc_exception_throw and destroyed by
2358 // the personality function; this avoids the need for bracketing
2359 // catch handlers with calls to __blah_begin_catch/__blah_end_catch
2360 // (or even _Unwind_DeleteException), but probably doesn't
2361 // interoperate very well with foreign exceptions.
2363 // In Objective-C++ mode, we actually emit something equivalent to the C++
2364 // exception handler.
2365 EmitTryCatchStmt(CGF, S, EnterCatchFn, ExitCatchFn, ExceptionReThrowFn);
2369 void CGObjCGNU::EmitThrowStmt(CodeGenFunction &CGF,
2370 const ObjCAtThrowStmt &S) {
2371 llvm::Value *ExceptionAsObject;
2373 if (const Expr *ThrowExpr = S.getThrowExpr()) {
2374 llvm::Value *Exception = CGF.EmitObjCThrowOperand(ThrowExpr);
2375 ExceptionAsObject = Exception;
2377 assert((!CGF.ObjCEHValueStack.empty() && CGF.ObjCEHValueStack.back()) &&
2378 "Unexpected rethrow outside @catch block.");
2379 ExceptionAsObject = CGF.ObjCEHValueStack.back();
2381 ExceptionAsObject = CGF.Builder.CreateBitCast(ExceptionAsObject, IdTy);
2383 // Note: This may have to be an invoke, if we want to support constructs like:
2389 // This is effectively turning @throw into an incredibly-expensive goto, but
2390 // it may happen as a result of inlining followed by missed optimizations, or
2391 // as a result of stupidity.
2392 llvm::BasicBlock *UnwindBB = CGF.getInvokeDest();
2394 CGF.Builder.CreateCall(ExceptionThrowFn, ExceptionAsObject);
2395 CGF.Builder.CreateUnreachable();
2397 CGF.Builder.CreateInvoke(ExceptionThrowFn, UnwindBB, UnwindBB,
2400 // Clear the insertion point to indicate we are in unreachable code.
2401 CGF.Builder.ClearInsertionPoint();
2404 llvm::Value * CGObjCGNU::EmitObjCWeakRead(CodeGenFunction &CGF,
2405 llvm::Value *AddrWeakObj) {
2406 CGBuilderTy B = CGF.Builder;
2407 AddrWeakObj = EnforceType(B, AddrWeakObj, PtrToIdTy);
2408 return B.CreateCall(WeakReadFn, AddrWeakObj);
2411 void CGObjCGNU::EmitObjCWeakAssign(CodeGenFunction &CGF,
2412 llvm::Value *src, llvm::Value *dst) {
2413 CGBuilderTy B = CGF.Builder;
2414 src = EnforceType(B, src, IdTy);
2415 dst = EnforceType(B, dst, PtrToIdTy);
2416 B.CreateCall2(WeakAssignFn, src, dst);
2419 void CGObjCGNU::EmitObjCGlobalAssign(CodeGenFunction &CGF,
2420 llvm::Value *src, llvm::Value *dst,
2422 CGBuilderTy B = CGF.Builder;
2423 src = EnforceType(B, src, IdTy);
2424 dst = EnforceType(B, dst, PtrToIdTy);
2426 B.CreateCall2(GlobalAssignFn, src, dst);
2428 // FIXME. Add threadloca assign API
2429 llvm_unreachable("EmitObjCGlobalAssign - Threal Local API NYI");
2432 void CGObjCGNU::EmitObjCIvarAssign(CodeGenFunction &CGF,
2433 llvm::Value *src, llvm::Value *dst,
2434 llvm::Value *ivarOffset) {
2435 CGBuilderTy B = CGF.Builder;
2436 src = EnforceType(B, src, IdTy);
2437 dst = EnforceType(B, dst, IdTy);
2438 B.CreateCall3(IvarAssignFn, src, dst, ivarOffset);
2441 void CGObjCGNU::EmitObjCStrongCastAssign(CodeGenFunction &CGF,
2442 llvm::Value *src, llvm::Value *dst) {
2443 CGBuilderTy B = CGF.Builder;
2444 src = EnforceType(B, src, IdTy);
2445 dst = EnforceType(B, dst, PtrToIdTy);
2446 B.CreateCall2(StrongCastAssignFn, src, dst);
2449 void CGObjCGNU::EmitGCMemmoveCollectable(CodeGenFunction &CGF,
2450 llvm::Value *DestPtr,
2451 llvm::Value *SrcPtr,
2452 llvm::Value *Size) {
2453 CGBuilderTy B = CGF.Builder;
2454 DestPtr = EnforceType(B, DestPtr, PtrTy);
2455 SrcPtr = EnforceType(B, SrcPtr, PtrTy);
2457 B.CreateCall3(MemMoveFn, DestPtr, SrcPtr, Size);
2460 llvm::GlobalVariable *CGObjCGNU::ObjCIvarOffsetVariable(
2461 const ObjCInterfaceDecl *ID,
2462 const ObjCIvarDecl *Ivar) {
2463 const std::string Name = "__objc_ivar_offset_" + ID->getNameAsString()
2464 + '.' + Ivar->getNameAsString();
2465 // Emit the variable and initialize it with what we think the correct value
2466 // is. This allows code compiled with non-fragile ivars to work correctly
2467 // when linked against code which isn't (most of the time).
2468 llvm::GlobalVariable *IvarOffsetPointer = TheModule.getNamedGlobal(Name);
2469 if (!IvarOffsetPointer) {
2470 // This will cause a run-time crash if we accidentally use it. A value of
2471 // 0 would seem more sensible, but will silently overwrite the isa pointer
2472 // causing a great deal of confusion.
2473 uint64_t Offset = -1;
2474 // We can't call ComputeIvarBaseOffset() here if we have the
2475 // implementation, because it will create an invalid ASTRecordLayout object
2476 // that we are then stuck with forever, so we only initialize the ivar
2477 // offset variable with a guess if we only have the interface. The
2478 // initializer will be reset later anyway, when we are generating the class
2480 if (!CGM.getContext().getObjCImplementation(
2481 const_cast<ObjCInterfaceDecl *>(ID)))
2482 Offset = ComputeIvarBaseOffset(CGM, ID, Ivar);
2484 llvm::ConstantInt *OffsetGuess = llvm::ConstantInt::get(Int32Ty, Offset,
2486 // Don't emit the guess in non-PIC code because the linker will not be able
2487 // to replace it with the real version for a library. In non-PIC code you
2488 // must compile with the fragile ABI if you want to use ivars from a
2489 // GCC-compiled class.
2490 if (CGM.getLangOptions().PICLevel) {
2491 llvm::GlobalVariable *IvarOffsetGV = new llvm::GlobalVariable(TheModule,
2493 llvm::GlobalValue::PrivateLinkage, OffsetGuess, Name+".guess");
2494 IvarOffsetPointer = new llvm::GlobalVariable(TheModule,
2495 IvarOffsetGV->getType(), false, llvm::GlobalValue::LinkOnceAnyLinkage,
2496 IvarOffsetGV, Name);
2498 IvarOffsetPointer = new llvm::GlobalVariable(TheModule,
2499 llvm::Type::getInt32PtrTy(VMContext), false,
2500 llvm::GlobalValue::ExternalLinkage, 0, Name);
2503 return IvarOffsetPointer;
2506 LValue CGObjCGNU::EmitObjCValueForIvar(CodeGenFunction &CGF,
2508 llvm::Value *BaseValue,
2509 const ObjCIvarDecl *Ivar,
2510 unsigned CVRQualifiers) {
2511 const ObjCInterfaceDecl *ID =
2512 ObjectTy->getAs<ObjCObjectType>()->getInterface();
2513 return EmitValueForIvarAtOffset(CGF, ID, BaseValue, Ivar, CVRQualifiers,
2514 EmitIvarOffset(CGF, ID, Ivar));
2517 static const ObjCInterfaceDecl *FindIvarInterface(ASTContext &Context,
2518 const ObjCInterfaceDecl *OID,
2519 const ObjCIvarDecl *OIVD) {
2520 for (const ObjCIvarDecl *next = OID->all_declared_ivar_begin(); next;
2521 next = next->getNextIvar()) {
2526 // Otherwise check in the super class.
2527 if (const ObjCInterfaceDecl *Super = OID->getSuperClass())
2528 return FindIvarInterface(Context, Super, OIVD);
2533 llvm::Value *CGObjCGNU::EmitIvarOffset(CodeGenFunction &CGF,
2534 const ObjCInterfaceDecl *Interface,
2535 const ObjCIvarDecl *Ivar) {
2536 if (CGM.getLangOptions().ObjCNonFragileABI) {
2537 Interface = FindIvarInterface(CGM.getContext(), Interface, Ivar);
2538 if (RuntimeVersion < 10)
2539 return CGF.Builder.CreateZExtOrBitCast(
2540 CGF.Builder.CreateLoad(CGF.Builder.CreateLoad(
2541 ObjCIvarOffsetVariable(Interface, Ivar), false, "ivar")),
2543 std::string name = "__objc_ivar_offset_value_" +
2544 Interface->getNameAsString() +"." + Ivar->getNameAsString();
2545 llvm::Value *Offset = TheModule.getGlobalVariable(name);
2547 Offset = new llvm::GlobalVariable(TheModule, IntTy,
2548 false, llvm::GlobalValue::LinkOnceAnyLinkage,
2549 llvm::Constant::getNullValue(IntTy), name);
2550 return CGF.Builder.CreateLoad(Offset);
2552 uint64_t Offset = ComputeIvarBaseOffset(CGF.CGM, Interface, Ivar);
2553 return llvm::ConstantInt::get(PtrDiffTy, Offset, /*isSigned*/true);
2557 clang::CodeGen::CreateGNUObjCRuntime(CodeGenModule &CGM) {
2558 if (CGM.getLangOptions().ObjCNonFragileABI)
2559 return new CGObjCGNUstep(CGM);
2560 return new CGObjCGCC(CGM);