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 "CGCleanup.h"
19 #include "CodeGenFunction.h"
20 #include "CodeGenModule.h"
21 #include "clang/AST/ASTContext.h"
22 #include "clang/AST/Decl.h"
23 #include "clang/AST/DeclObjC.h"
24 #include "clang/AST/RecordLayout.h"
25 #include "clang/AST/StmtObjC.h"
26 #include "clang/Basic/FileManager.h"
27 #include "clang/Basic/SourceManager.h"
28 #include "llvm/ADT/SmallVector.h"
29 #include "llvm/ADT/StringMap.h"
30 #include "llvm/IR/CallSite.h"
31 #include "llvm/IR/DataLayout.h"
32 #include "llvm/IR/Intrinsics.h"
33 #include "llvm/IR/LLVMContext.h"
34 #include "llvm/IR/Module.h"
35 #include "llvm/Support/Compiler.h"
38 using namespace clang;
39 using namespace CodeGen;
42 /// Class that lazily initialises the runtime function. Avoids inserting the
43 /// types and the function declaration into a module if they're not used, and
44 /// avoids constructing the type more than once if it's used more than once.
45 class LazyRuntimeFunction {
47 llvm::FunctionType *FTy;
48 const char *FunctionName;
49 llvm::Constant *Function;
52 /// Constructor leaves this class uninitialized, because it is intended to
53 /// be used as a field in another class and not all of the types that are
54 /// used as arguments will necessarily be available at construction time.
56 : CGM(nullptr), FunctionName(nullptr), Function(nullptr) {}
58 /// Initialises the lazy function with the name, return type, and the types
61 void init(CodeGenModule *Mod, const char *name, llvm::Type *RetTy, ...) {
65 std::vector<llvm::Type *> ArgTys;
67 va_start(Args, RetTy);
68 while (llvm::Type *ArgTy = va_arg(Args, llvm::Type *))
69 ArgTys.push_back(ArgTy);
71 FTy = llvm::FunctionType::get(RetTy, ArgTys, false);
74 llvm::FunctionType *getType() { return FTy; }
76 /// Overloaded cast operator, allows the class to be implicitly cast to an
78 operator llvm::Constant *() {
83 cast<llvm::Constant>(CGM->CreateRuntimeFunction(FTy, FunctionName));
87 operator llvm::Function *() {
88 return cast<llvm::Function>((llvm::Constant *)*this);
93 /// GNU Objective-C runtime code generation. This class implements the parts of
94 /// Objective-C support that are specific to the GNU family of runtimes (GCC,
95 /// GNUstep and ObjFW).
96 class CGObjCGNU : public CGObjCRuntime {
98 /// The LLVM module into which output is inserted
99 llvm::Module &TheModule;
100 /// strut objc_super. Used for sending messages to super. This structure
101 /// contains the receiver (object) and the expected class.
102 llvm::StructType *ObjCSuperTy;
103 /// struct objc_super*. The type of the argument to the superclass message
104 /// lookup functions.
105 llvm::PointerType *PtrToObjCSuperTy;
106 /// LLVM type for selectors. Opaque pointer (i8*) unless a header declaring
107 /// SEL is included in a header somewhere, in which case it will be whatever
108 /// type is declared in that header, most likely {i8*, i8*}.
109 llvm::PointerType *SelectorTy;
110 /// LLVM i8 type. Cached here to avoid repeatedly getting it in all of the
111 /// places where it's used
112 llvm::IntegerType *Int8Ty;
113 /// Pointer to i8 - LLVM type of char*, for all of the places where the
114 /// runtime needs to deal with C strings.
115 llvm::PointerType *PtrToInt8Ty;
116 /// Instance Method Pointer type. This is a pointer to a function that takes,
117 /// at a minimum, an object and a selector, and is the generic type for
118 /// Objective-C methods. Due to differences between variadic / non-variadic
119 /// calling conventions, it must always be cast to the correct type before
120 /// actually being used.
121 llvm::PointerType *IMPTy;
122 /// Type of an untyped Objective-C object. Clang treats id as a built-in type
123 /// when compiling Objective-C code, so this may be an opaque pointer (i8*),
124 /// but if the runtime header declaring it is included then it may be a
125 /// pointer to a structure.
126 llvm::PointerType *IdTy;
127 /// Pointer to a pointer to an Objective-C object. Used in the new ABI
128 /// message lookup function and some GC-related functions.
129 llvm::PointerType *PtrToIdTy;
130 /// The clang type of id. Used when using the clang CGCall infrastructure to
131 /// call Objective-C methods.
133 /// LLVM type for C int type.
134 llvm::IntegerType *IntTy;
135 /// LLVM type for an opaque pointer. This is identical to PtrToInt8Ty, but is
136 /// used in the code to document the difference between i8* meaning a pointer
137 /// to a C string and i8* meaning a pointer to some opaque type.
138 llvm::PointerType *PtrTy;
139 /// LLVM type for C long type. The runtime uses this in a lot of places where
140 /// it should be using intptr_t, but we can't fix this without breaking
141 /// compatibility with GCC...
142 llvm::IntegerType *LongTy;
143 /// LLVM type for C size_t. Used in various runtime data structures.
144 llvm::IntegerType *SizeTy;
145 /// LLVM type for C intptr_t.
146 llvm::IntegerType *IntPtrTy;
147 /// LLVM type for C ptrdiff_t. Mainly used in property accessor functions.
148 llvm::IntegerType *PtrDiffTy;
149 /// LLVM type for C int*. Used for GCC-ABI-compatible non-fragile instance
151 llvm::PointerType *PtrToIntTy;
152 /// LLVM type for Objective-C BOOL type.
154 /// 32-bit integer type, to save us needing to look it up every time it's used.
155 llvm::IntegerType *Int32Ty;
156 /// 64-bit integer type, to save us needing to look it up every time it's used.
157 llvm::IntegerType *Int64Ty;
158 /// Metadata kind used to tie method lookups to message sends. The GNUstep
159 /// runtime provides some LLVM passes that can use this to do things like
160 /// automatic IMP caching and speculative inlining.
161 unsigned msgSendMDKind;
163 /// Helper function that generates a constant string and returns a pointer to
164 /// the start of the string. The result of this function can be used anywhere
165 /// where the C code specifies const char*.
166 llvm::Constant *MakeConstantString(const std::string &Str,
167 const std::string &Name="") {
168 ConstantAddress Array = CGM.GetAddrOfConstantCString(Str, Name.c_str());
169 return llvm::ConstantExpr::getGetElementPtr(Array.getElementType(),
170 Array.getPointer(), Zeros);
173 /// Emits a linkonce_odr string, whose name is the prefix followed by the
174 /// string value. This allows the linker to combine the strings between
175 /// different modules. Used for EH typeinfo names, selector strings, and a
176 /// few other things.
177 llvm::Constant *ExportUniqueString(const std::string &Str,
178 const std::string prefix) {
179 std::string name = prefix + Str;
180 auto *ConstStr = TheModule.getGlobalVariable(name);
182 llvm::Constant *value = llvm::ConstantDataArray::getString(VMContext,Str);
183 ConstStr = new llvm::GlobalVariable(TheModule, value->getType(), true,
184 llvm::GlobalValue::LinkOnceODRLinkage, value, prefix + Str);
186 return llvm::ConstantExpr::getGetElementPtr(ConstStr->getValueType(),
190 /// Generates a global structure, initialized by the elements in the vector.
191 /// The element types must match the types of the structure elements in the
193 llvm::GlobalVariable *MakeGlobal(llvm::StructType *Ty,
194 ArrayRef<llvm::Constant *> V,
197 llvm::GlobalValue::LinkageTypes linkage
198 =llvm::GlobalValue::InternalLinkage) {
199 llvm::Constant *C = llvm::ConstantStruct::get(Ty, V);
200 auto GV = new llvm::GlobalVariable(TheModule, Ty, false,
202 GV->setAlignment(Align.getQuantity());
206 /// Generates a global array. The vector must contain the same number of
207 /// elements that the array type declares, of the type specified as the array
209 llvm::GlobalVariable *MakeGlobal(llvm::ArrayType *Ty,
210 ArrayRef<llvm::Constant *> V,
213 llvm::GlobalValue::LinkageTypes linkage
214 =llvm::GlobalValue::InternalLinkage) {
215 llvm::Constant *C = llvm::ConstantArray::get(Ty, V);
216 auto GV = new llvm::GlobalVariable(TheModule, Ty, false,
218 GV->setAlignment(Align.getQuantity());
222 /// Generates a global array, inferring the array type from the specified
223 /// element type and the size of the initialiser.
224 llvm::GlobalVariable *MakeGlobalArray(llvm::Type *Ty,
225 ArrayRef<llvm::Constant *> V,
228 llvm::GlobalValue::LinkageTypes linkage
229 =llvm::GlobalValue::InternalLinkage) {
230 llvm::ArrayType *ArrayTy = llvm::ArrayType::get(Ty, V.size());
231 return MakeGlobal(ArrayTy, V, Align, Name, linkage);
234 /// Returns a property name and encoding string.
235 llvm::Constant *MakePropertyEncodingString(const ObjCPropertyDecl *PD,
236 const Decl *Container) {
237 const ObjCRuntime &R = CGM.getLangOpts().ObjCRuntime;
238 if ((R.getKind() == ObjCRuntime::GNUstep) &&
239 (R.getVersion() >= VersionTuple(1, 6))) {
240 std::string NameAndAttributes;
242 CGM.getContext().getObjCEncodingForPropertyDecl(PD, Container, TypeStr);
243 NameAndAttributes += '\0';
244 NameAndAttributes += TypeStr.length() + 3;
245 NameAndAttributes += TypeStr;
246 NameAndAttributes += '\0';
247 NameAndAttributes += PD->getNameAsString();
248 return MakeConstantString(NameAndAttributes);
250 return MakeConstantString(PD->getNameAsString());
253 /// Push the property attributes into two structure fields.
254 void PushPropertyAttributes(std::vector<llvm::Constant*> &Fields,
255 ObjCPropertyDecl *property, bool isSynthesized=true, bool
257 int attrs = property->getPropertyAttributes();
258 // For read-only properties, clear the copy and retain flags
259 if (attrs & ObjCPropertyDecl::OBJC_PR_readonly) {
260 attrs &= ~ObjCPropertyDecl::OBJC_PR_copy;
261 attrs &= ~ObjCPropertyDecl::OBJC_PR_retain;
262 attrs &= ~ObjCPropertyDecl::OBJC_PR_weak;
263 attrs &= ~ObjCPropertyDecl::OBJC_PR_strong;
265 // The first flags field has the same attribute values as clang uses internally
266 Fields.push_back(llvm::ConstantInt::get(Int8Ty, attrs & 0xff));
269 // For protocol properties, synthesized and dynamic have no meaning, so we
270 // reuse these flags to indicate that this is a protocol property (both set
271 // has no meaning, as a property can't be both synthesized and dynamic)
272 attrs |= isSynthesized ? (1<<0) : 0;
273 attrs |= isDynamic ? (1<<1) : 0;
274 // The second field is the next four fields left shifted by two, with the
275 // low bit set to indicate whether the field is synthesized or dynamic.
276 Fields.push_back(llvm::ConstantInt::get(Int8Ty, attrs & 0xff));
277 // Two padding fields
278 Fields.push_back(llvm::ConstantInt::get(Int8Ty, 0));
279 Fields.push_back(llvm::ConstantInt::get(Int8Ty, 0));
282 /// Ensures that the value has the required type, by inserting a bitcast if
283 /// required. This function lets us avoid inserting bitcasts that are
285 llvm::Value* EnforceType(CGBuilderTy &B, llvm::Value *V, llvm::Type *Ty) {
286 if (V->getType() == Ty) return V;
287 return B.CreateBitCast(V, Ty);
289 Address EnforceType(CGBuilderTy &B, Address V, llvm::Type *Ty) {
290 if (V.getType() == Ty) return V;
291 return B.CreateBitCast(V, Ty);
294 // Some zeros used for GEPs in lots of places.
295 llvm::Constant *Zeros[2];
296 /// Null pointer value. Mainly used as a terminator in various arrays.
297 llvm::Constant *NULLPtr;
299 llvm::LLVMContext &VMContext;
302 /// Placeholder for the class. Lots of things refer to the class before we've
303 /// actually emitted it. We use this alias as a placeholder, and then replace
304 /// it with a pointer to the class structure before finally emitting the
306 llvm::GlobalAlias *ClassPtrAlias;
307 /// Placeholder for the metaclass. Lots of things refer to the class before
308 /// we've / actually emitted it. We use this alias as a placeholder, and then
309 /// replace / it with a pointer to the metaclass structure before finally
310 /// emitting the / module.
311 llvm::GlobalAlias *MetaClassPtrAlias;
312 /// All of the classes that have been generated for this compilation units.
313 std::vector<llvm::Constant*> Classes;
314 /// All of the categories that have been generated for this compilation units.
315 std::vector<llvm::Constant*> Categories;
316 /// All of the Objective-C constant strings that have been generated for this
317 /// compilation units.
318 std::vector<llvm::Constant*> ConstantStrings;
319 /// Map from string values to Objective-C constant strings in the output.
320 /// Used to prevent emitting Objective-C strings more than once. This should
321 /// not be required at all - CodeGenModule should manage this list.
322 llvm::StringMap<llvm::Constant*> ObjCStrings;
323 /// All of the protocols that have been declared.
324 llvm::StringMap<llvm::Constant*> ExistingProtocols;
325 /// For each variant of a selector, we store the type encoding and a
326 /// placeholder value. For an untyped selector, the type will be the empty
327 /// string. Selector references are all done via the module's selector table,
328 /// so we create an alias as a placeholder and then replace it with the real
330 typedef std::pair<std::string, llvm::GlobalAlias*> TypedSelector;
331 /// Type of the selector map. This is roughly equivalent to the structure
332 /// used in the GNUstep runtime, which maintains a list of all of the valid
333 /// types for a selector in a table.
334 typedef llvm::DenseMap<Selector, SmallVector<TypedSelector, 2> >
336 /// A map from selectors to selector types. This allows us to emit all
337 /// selectors of the same name and type together.
338 SelectorMap SelectorTable;
340 /// Selectors related to memory management. When compiling in GC mode, we
342 Selector RetainSel, ReleaseSel, AutoreleaseSel;
343 /// Runtime functions used for memory management in GC mode. Note that clang
344 /// supports code generation for calling these functions, but neither GNU
345 /// runtime actually supports this API properly yet.
346 LazyRuntimeFunction IvarAssignFn, StrongCastAssignFn, MemMoveFn, WeakReadFn,
347 WeakAssignFn, GlobalAssignFn;
349 typedef std::pair<std::string, std::string> ClassAliasPair;
350 /// All classes that have aliases set for them.
351 std::vector<ClassAliasPair> ClassAliases;
354 /// Function used for throwing Objective-C exceptions.
355 LazyRuntimeFunction ExceptionThrowFn;
356 /// Function used for rethrowing exceptions, used at the end of \@finally or
357 /// \@synchronize blocks.
358 LazyRuntimeFunction ExceptionReThrowFn;
359 /// Function called when entering a catch function. This is required for
360 /// differentiating Objective-C exceptions and foreign exceptions.
361 LazyRuntimeFunction EnterCatchFn;
362 /// Function called when exiting from a catch block. Used to do exception
364 LazyRuntimeFunction ExitCatchFn;
365 /// Function called when entering an \@synchronize block. Acquires the lock.
366 LazyRuntimeFunction SyncEnterFn;
367 /// Function called when exiting an \@synchronize block. Releases the lock.
368 LazyRuntimeFunction SyncExitFn;
371 /// Function called if fast enumeration detects that the collection is
372 /// modified during the update.
373 LazyRuntimeFunction EnumerationMutationFn;
374 /// Function for implementing synthesized property getters that return an
376 LazyRuntimeFunction GetPropertyFn;
377 /// Function for implementing synthesized property setters that return an
379 LazyRuntimeFunction SetPropertyFn;
380 /// Function used for non-object declared property getters.
381 LazyRuntimeFunction GetStructPropertyFn;
382 /// Function used for non-object declared property setters.
383 LazyRuntimeFunction SetStructPropertyFn;
385 /// The version of the runtime that this class targets. Must match the
386 /// version in the runtime.
388 /// The version of the protocol class. Used to differentiate between ObjC1
389 /// and ObjC2 protocols. Objective-C 1 protocols can not contain optional
390 /// components and can not contain declared properties. We always emit
391 /// Objective-C 2 property structures, but we have to pretend that they're
392 /// Objective-C 1 property structures when targeting the GCC runtime or it
394 const int ProtocolVersion;
396 /// Generates an instance variable list structure. This is a structure
397 /// containing a size and an array of structures containing instance variable
398 /// metadata. This is used purely for introspection in the fragile ABI. In
399 /// the non-fragile ABI, it's used for instance variable fixup.
400 llvm::Constant *GenerateIvarList(ArrayRef<llvm::Constant *> IvarNames,
401 ArrayRef<llvm::Constant *> IvarTypes,
402 ArrayRef<llvm::Constant *> IvarOffsets);
404 /// Generates a method list structure. This is a structure containing a size
405 /// and an array of structures containing method metadata.
407 /// This structure is used by both classes and categories, and contains a next
408 /// pointer allowing them to be chained together in a linked list.
409 llvm::Constant *GenerateMethodList(StringRef ClassName,
410 StringRef CategoryName,
411 ArrayRef<Selector> MethodSels,
412 ArrayRef<llvm::Constant *> MethodTypes,
413 bool isClassMethodList);
415 /// Emits an empty protocol. This is used for \@protocol() where no protocol
416 /// is found. The runtime will (hopefully) fix up the pointer to refer to the
418 llvm::Constant *GenerateEmptyProtocol(const std::string &ProtocolName);
420 /// Generates a list of property metadata structures. This follows the same
421 /// pattern as method and instance variable metadata lists.
422 llvm::Constant *GeneratePropertyList(const ObjCImplementationDecl *OID,
423 SmallVectorImpl<Selector> &InstanceMethodSels,
424 SmallVectorImpl<llvm::Constant*> &InstanceMethodTypes);
426 /// Generates a list of referenced protocols. Classes, categories, and
427 /// protocols all use this structure.
428 llvm::Constant *GenerateProtocolList(ArrayRef<std::string> Protocols);
430 /// To ensure that all protocols are seen by the runtime, we add a category on
431 /// a class defined in the runtime, declaring no methods, but adopting the
432 /// protocols. This is a horribly ugly hack, but it allows us to collect all
433 /// of the protocols without changing the ABI.
434 void GenerateProtocolHolderCategory();
436 /// Generates a class structure.
437 llvm::Constant *GenerateClassStructure(
438 llvm::Constant *MetaClass,
439 llvm::Constant *SuperClass,
442 llvm::Constant *Version,
443 llvm::Constant *InstanceSize,
444 llvm::Constant *IVars,
445 llvm::Constant *Methods,
446 llvm::Constant *Protocols,
447 llvm::Constant *IvarOffsets,
448 llvm::Constant *Properties,
449 llvm::Constant *StrongIvarBitmap,
450 llvm::Constant *WeakIvarBitmap,
453 /// Generates a method list. This is used by protocols to define the required
454 /// and optional methods.
455 llvm::Constant *GenerateProtocolMethodList(
456 ArrayRef<llvm::Constant *> MethodNames,
457 ArrayRef<llvm::Constant *> MethodTypes);
459 /// Returns a selector with the specified type encoding. An empty string is
460 /// used to return an untyped selector (with the types field set to NULL).
461 llvm::Value *GetSelector(CodeGenFunction &CGF, Selector Sel,
462 const std::string &TypeEncoding);
464 /// Returns the variable used to store the offset of an instance variable.
465 llvm::GlobalVariable *ObjCIvarOffsetVariable(const ObjCInterfaceDecl *ID,
466 const ObjCIvarDecl *Ivar);
467 /// Emits a reference to a class. This allows the linker to object if there
468 /// is no class of the matching name.
471 void EmitClassRef(const std::string &className);
473 /// Emits a pointer to the named class
474 virtual llvm::Value *GetClassNamed(CodeGenFunction &CGF,
475 const std::string &Name, bool isWeak);
477 /// Looks up the method for sending a message to the specified object. This
478 /// mechanism differs between the GCC and GNU runtimes, so this method must be
479 /// overridden in subclasses.
480 virtual llvm::Value *LookupIMP(CodeGenFunction &CGF,
481 llvm::Value *&Receiver,
484 MessageSendInfo &MSI) = 0;
486 /// Looks up the method for sending a message to a superclass. This
487 /// mechanism differs between the GCC and GNU runtimes, so this method must
488 /// be overridden in subclasses.
489 virtual llvm::Value *LookupIMPSuper(CodeGenFunction &CGF,
492 MessageSendInfo &MSI) = 0;
494 /// Libobjc2 uses a bitfield representation where small(ish) bitfields are
495 /// stored in a 64-bit value with the low bit set to 1 and the remaining 63
496 /// bits set to their values, LSB first, while larger ones are stored in a
497 /// structure of this / form:
499 /// struct { int32_t length; int32_t values[length]; };
501 /// The values in the array are stored in host-endian format, with the least
502 /// significant bit being assumed to come first in the bitfield. Therefore,
503 /// a bitfield with the 64th bit set will be (int64_t)&{ 2, [0, 1<<31] },
504 /// while a bitfield / with the 63rd bit set will be 1<<64.
505 llvm::Constant *MakeBitField(ArrayRef<bool> bits);
508 CGObjCGNU(CodeGenModule &cgm, unsigned runtimeABIVersion,
509 unsigned protocolClassVersion);
511 ConstantAddress GenerateConstantString(const StringLiteral *) override;
514 GenerateMessageSend(CodeGenFunction &CGF, ReturnValueSlot Return,
515 QualType ResultType, Selector Sel,
516 llvm::Value *Receiver, const CallArgList &CallArgs,
517 const ObjCInterfaceDecl *Class,
518 const ObjCMethodDecl *Method) override;
520 GenerateMessageSendSuper(CodeGenFunction &CGF, ReturnValueSlot Return,
521 QualType ResultType, Selector Sel,
522 const ObjCInterfaceDecl *Class,
523 bool isCategoryImpl, llvm::Value *Receiver,
524 bool IsClassMessage, const CallArgList &CallArgs,
525 const ObjCMethodDecl *Method) override;
526 llvm::Value *GetClass(CodeGenFunction &CGF,
527 const ObjCInterfaceDecl *OID) override;
528 llvm::Value *GetSelector(CodeGenFunction &CGF, Selector Sel) override;
529 Address GetAddrOfSelector(CodeGenFunction &CGF, Selector Sel) override;
530 llvm::Value *GetSelector(CodeGenFunction &CGF,
531 const ObjCMethodDecl *Method) override;
532 llvm::Constant *GetEHType(QualType T) override;
534 llvm::Function *GenerateMethod(const ObjCMethodDecl *OMD,
535 const ObjCContainerDecl *CD) override;
536 void GenerateCategory(const ObjCCategoryImplDecl *CMD) override;
537 void GenerateClass(const ObjCImplementationDecl *ClassDecl) override;
538 void RegisterAlias(const ObjCCompatibleAliasDecl *OAD) override;
539 llvm::Value *GenerateProtocolRef(CodeGenFunction &CGF,
540 const ObjCProtocolDecl *PD) override;
541 void GenerateProtocol(const ObjCProtocolDecl *PD) override;
542 llvm::Function *ModuleInitFunction() override;
543 llvm::Constant *GetPropertyGetFunction() override;
544 llvm::Constant *GetPropertySetFunction() override;
545 llvm::Constant *GetOptimizedPropertySetFunction(bool atomic,
547 llvm::Constant *GetSetStructFunction() override;
548 llvm::Constant *GetGetStructFunction() override;
549 llvm::Constant *GetCppAtomicObjectGetFunction() override;
550 llvm::Constant *GetCppAtomicObjectSetFunction() override;
551 llvm::Constant *EnumerationMutationFunction() override;
553 void EmitTryStmt(CodeGenFunction &CGF,
554 const ObjCAtTryStmt &S) override;
555 void EmitSynchronizedStmt(CodeGenFunction &CGF,
556 const ObjCAtSynchronizedStmt &S) override;
557 void EmitThrowStmt(CodeGenFunction &CGF,
558 const ObjCAtThrowStmt &S,
559 bool ClearInsertionPoint=true) override;
560 llvm::Value * EmitObjCWeakRead(CodeGenFunction &CGF,
561 Address AddrWeakObj) override;
562 void EmitObjCWeakAssign(CodeGenFunction &CGF,
563 llvm::Value *src, Address dst) override;
564 void EmitObjCGlobalAssign(CodeGenFunction &CGF,
565 llvm::Value *src, Address dest,
566 bool threadlocal=false) override;
567 void EmitObjCIvarAssign(CodeGenFunction &CGF, llvm::Value *src,
568 Address dest, llvm::Value *ivarOffset) override;
569 void EmitObjCStrongCastAssign(CodeGenFunction &CGF,
570 llvm::Value *src, Address dest) override;
571 void EmitGCMemmoveCollectable(CodeGenFunction &CGF, Address DestPtr,
573 llvm::Value *Size) override;
574 LValue EmitObjCValueForIvar(CodeGenFunction &CGF, QualType ObjectTy,
575 llvm::Value *BaseValue, const ObjCIvarDecl *Ivar,
576 unsigned CVRQualifiers) override;
577 llvm::Value *EmitIvarOffset(CodeGenFunction &CGF,
578 const ObjCInterfaceDecl *Interface,
579 const ObjCIvarDecl *Ivar) override;
580 llvm::Value *EmitNSAutoreleasePoolClassRef(CodeGenFunction &CGF) override;
581 llvm::Constant *BuildGCBlockLayout(CodeGenModule &CGM,
582 const CGBlockInfo &blockInfo) override {
585 llvm::Constant *BuildRCBlockLayout(CodeGenModule &CGM,
586 const CGBlockInfo &blockInfo) override {
590 llvm::Constant *BuildByrefLayout(CodeGenModule &CGM, QualType T) override {
594 llvm::GlobalVariable *GetClassGlobal(StringRef Name,
595 bool Weak = false) override {
600 /// Class representing the legacy GCC Objective-C ABI. This is the default when
601 /// -fobjc-nonfragile-abi is not specified.
603 /// The GCC ABI target actually generates code that is approximately compatible
604 /// with the new GNUstep runtime ABI, but refrains from using any features that
605 /// would not work with the GCC runtime. For example, clang always generates
606 /// the extended form of the class structure, and the extra fields are simply
607 /// ignored by GCC libobjc.
608 class CGObjCGCC : public CGObjCGNU {
609 /// The GCC ABI message lookup function. Returns an IMP pointing to the
610 /// method implementation for this message.
611 LazyRuntimeFunction MsgLookupFn;
612 /// The GCC ABI superclass message lookup function. Takes a pointer to a
613 /// structure describing the receiver and the class, and a selector as
614 /// arguments. Returns the IMP for the corresponding method.
615 LazyRuntimeFunction MsgLookupSuperFn;
618 llvm::Value *LookupIMP(CodeGenFunction &CGF, llvm::Value *&Receiver,
619 llvm::Value *cmd, llvm::MDNode *node,
620 MessageSendInfo &MSI) override {
621 CGBuilderTy &Builder = CGF.Builder;
622 llvm::Value *args[] = {
623 EnforceType(Builder, Receiver, IdTy),
624 EnforceType(Builder, cmd, SelectorTy) };
625 llvm::CallSite imp = CGF.EmitRuntimeCallOrInvoke(MsgLookupFn, args);
626 imp->setMetadata(msgSendMDKind, node);
627 return imp.getInstruction();
630 llvm::Value *LookupIMPSuper(CodeGenFunction &CGF, Address ObjCSuper,
631 llvm::Value *cmd, MessageSendInfo &MSI) override {
632 CGBuilderTy &Builder = CGF.Builder;
633 llvm::Value *lookupArgs[] = {EnforceType(Builder, ObjCSuper,
634 PtrToObjCSuperTy).getPointer(), cmd};
635 return CGF.EmitNounwindRuntimeCall(MsgLookupSuperFn, lookupArgs);
639 CGObjCGCC(CodeGenModule &Mod) : CGObjCGNU(Mod, 8, 2) {
640 // IMP objc_msg_lookup(id, SEL);
641 MsgLookupFn.init(&CGM, "objc_msg_lookup", IMPTy, IdTy, SelectorTy,
643 // IMP objc_msg_lookup_super(struct objc_super*, SEL);
644 MsgLookupSuperFn.init(&CGM, "objc_msg_lookup_super", IMPTy,
645 PtrToObjCSuperTy, SelectorTy, nullptr);
649 /// Class used when targeting the new GNUstep runtime ABI.
650 class CGObjCGNUstep : public CGObjCGNU {
651 /// The slot lookup function. Returns a pointer to a cacheable structure
652 /// that contains (among other things) the IMP.
653 LazyRuntimeFunction SlotLookupFn;
654 /// The GNUstep ABI superclass message lookup function. Takes a pointer to
655 /// a structure describing the receiver and the class, and a selector as
656 /// arguments. Returns the slot for the corresponding method. Superclass
657 /// message lookup rarely changes, so this is a good caching opportunity.
658 LazyRuntimeFunction SlotLookupSuperFn;
659 /// Specialised function for setting atomic retain properties
660 LazyRuntimeFunction SetPropertyAtomic;
661 /// Specialised function for setting atomic copy properties
662 LazyRuntimeFunction SetPropertyAtomicCopy;
663 /// Specialised function for setting nonatomic retain properties
664 LazyRuntimeFunction SetPropertyNonAtomic;
665 /// Specialised function for setting nonatomic copy properties
666 LazyRuntimeFunction SetPropertyNonAtomicCopy;
667 /// Function to perform atomic copies of C++ objects with nontrivial copy
668 /// constructors from Objective-C ivars.
669 LazyRuntimeFunction CxxAtomicObjectGetFn;
670 /// Function to perform atomic copies of C++ objects with nontrivial copy
671 /// constructors to Objective-C ivars.
672 LazyRuntimeFunction CxxAtomicObjectSetFn;
673 /// Type of an slot structure pointer. This is returned by the various
674 /// lookup functions.
678 llvm::Constant *GetEHType(QualType T) override;
681 llvm::Value *LookupIMP(CodeGenFunction &CGF, llvm::Value *&Receiver,
682 llvm::Value *cmd, llvm::MDNode *node,
683 MessageSendInfo &MSI) override {
684 CGBuilderTy &Builder = CGF.Builder;
685 llvm::Function *LookupFn = SlotLookupFn;
687 // Store the receiver on the stack so that we can reload it later
688 Address ReceiverPtr =
689 CGF.CreateTempAlloca(Receiver->getType(), CGF.getPointerAlign());
690 Builder.CreateStore(Receiver, ReceiverPtr);
694 if (isa<ObjCMethodDecl>(CGF.CurCodeDecl)) {
695 self = CGF.LoadObjCSelf();
697 self = llvm::ConstantPointerNull::get(IdTy);
700 // The lookup function is guaranteed not to capture the receiver pointer.
701 LookupFn->setDoesNotCapture(1);
703 llvm::Value *args[] = {
704 EnforceType(Builder, ReceiverPtr.getPointer(), PtrToIdTy),
705 EnforceType(Builder, cmd, SelectorTy),
706 EnforceType(Builder, self, IdTy) };
707 llvm::CallSite slot = CGF.EmitRuntimeCallOrInvoke(LookupFn, args);
708 slot.setOnlyReadsMemory();
709 slot->setMetadata(msgSendMDKind, node);
711 // Load the imp from the slot
712 llvm::Value *imp = Builder.CreateAlignedLoad(
713 Builder.CreateStructGEP(nullptr, slot.getInstruction(), 4),
714 CGF.getPointerAlign());
716 // The lookup function may have changed the receiver, so make sure we use
718 Receiver = Builder.CreateLoad(ReceiverPtr, true);
722 llvm::Value *LookupIMPSuper(CodeGenFunction &CGF, Address ObjCSuper,
724 MessageSendInfo &MSI) override {
725 CGBuilderTy &Builder = CGF.Builder;
726 llvm::Value *lookupArgs[] = {ObjCSuper.getPointer(), cmd};
728 llvm::CallInst *slot =
729 CGF.EmitNounwindRuntimeCall(SlotLookupSuperFn, lookupArgs);
730 slot->setOnlyReadsMemory();
732 return Builder.CreateAlignedLoad(Builder.CreateStructGEP(nullptr, slot, 4),
733 CGF.getPointerAlign());
737 CGObjCGNUstep(CodeGenModule &Mod) : CGObjCGNU(Mod, 9, 3) {
738 const ObjCRuntime &R = CGM.getLangOpts().ObjCRuntime;
740 llvm::StructType *SlotStructTy = llvm::StructType::get(PtrTy,
741 PtrTy, PtrTy, IntTy, IMPTy, nullptr);
742 SlotTy = llvm::PointerType::getUnqual(SlotStructTy);
743 // Slot_t objc_msg_lookup_sender(id *receiver, SEL selector, id sender);
744 SlotLookupFn.init(&CGM, "objc_msg_lookup_sender", SlotTy, PtrToIdTy,
745 SelectorTy, IdTy, nullptr);
746 // Slot_t objc_msg_lookup_super(struct objc_super*, SEL);
747 SlotLookupSuperFn.init(&CGM, "objc_slot_lookup_super", SlotTy,
748 PtrToObjCSuperTy, SelectorTy, nullptr);
749 // If we're in ObjC++ mode, then we want to make
750 if (CGM.getLangOpts().CPlusPlus) {
751 llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext);
752 // void *__cxa_begin_catch(void *e)
753 EnterCatchFn.init(&CGM, "__cxa_begin_catch", PtrTy, PtrTy, nullptr);
754 // void __cxa_end_catch(void)
755 ExitCatchFn.init(&CGM, "__cxa_end_catch", VoidTy, nullptr);
756 // void _Unwind_Resume_or_Rethrow(void*)
757 ExceptionReThrowFn.init(&CGM, "_Unwind_Resume_or_Rethrow", VoidTy,
759 } else if (R.getVersion() >= VersionTuple(1, 7)) {
760 llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext);
761 // id objc_begin_catch(void *e)
762 EnterCatchFn.init(&CGM, "objc_begin_catch", IdTy, PtrTy, nullptr);
763 // void objc_end_catch(void)
764 ExitCatchFn.init(&CGM, "objc_end_catch", VoidTy, nullptr);
765 // void _Unwind_Resume_or_Rethrow(void*)
766 ExceptionReThrowFn.init(&CGM, "objc_exception_rethrow", VoidTy,
769 llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext);
770 SetPropertyAtomic.init(&CGM, "objc_setProperty_atomic", VoidTy, IdTy,
771 SelectorTy, IdTy, PtrDiffTy, nullptr);
772 SetPropertyAtomicCopy.init(&CGM, "objc_setProperty_atomic_copy", VoidTy,
773 IdTy, SelectorTy, IdTy, PtrDiffTy, nullptr);
774 SetPropertyNonAtomic.init(&CGM, "objc_setProperty_nonatomic", VoidTy,
775 IdTy, SelectorTy, IdTy, PtrDiffTy, nullptr);
776 SetPropertyNonAtomicCopy.init(&CGM, "objc_setProperty_nonatomic_copy",
777 VoidTy, IdTy, SelectorTy, IdTy, PtrDiffTy, nullptr);
778 // void objc_setCppObjectAtomic(void *dest, const void *src, void
780 CxxAtomicObjectSetFn.init(&CGM, "objc_setCppObjectAtomic", VoidTy, PtrTy,
781 PtrTy, PtrTy, nullptr);
782 // void objc_getCppObjectAtomic(void *dest, const void *src, void
784 CxxAtomicObjectGetFn.init(&CGM, "objc_getCppObjectAtomic", VoidTy, PtrTy,
785 PtrTy, PtrTy, nullptr);
788 llvm::Constant *GetCppAtomicObjectGetFunction() override {
789 // The optimised functions were added in version 1.7 of the GNUstep
791 assert (CGM.getLangOpts().ObjCRuntime.getVersion() >=
793 return CxxAtomicObjectGetFn;
796 llvm::Constant *GetCppAtomicObjectSetFunction() override {
797 // The optimised functions were added in version 1.7 of the GNUstep
799 assert (CGM.getLangOpts().ObjCRuntime.getVersion() >=
801 return CxxAtomicObjectSetFn;
804 llvm::Constant *GetOptimizedPropertySetFunction(bool atomic,
805 bool copy) override {
806 // The optimised property functions omit the GC check, and so are not
807 // safe to use in GC mode. The standard functions are fast in GC mode,
808 // so there is less advantage in using them.
809 assert ((CGM.getLangOpts().getGC() == LangOptions::NonGC));
810 // The optimised functions were added in version 1.7 of the GNUstep
812 assert (CGM.getLangOpts().ObjCRuntime.getVersion() >=
816 if (copy) return SetPropertyAtomicCopy;
817 return SetPropertyAtomic;
820 return copy ? SetPropertyNonAtomicCopy : SetPropertyNonAtomic;
824 /// Support for the ObjFW runtime.
825 class CGObjCObjFW: public CGObjCGNU {
827 /// The GCC ABI message lookup function. Returns an IMP pointing to the
828 /// method implementation for this message.
829 LazyRuntimeFunction MsgLookupFn;
830 /// stret lookup function. While this does not seem to make sense at the
831 /// first look, this is required to call the correct forwarding function.
832 LazyRuntimeFunction MsgLookupFnSRet;
833 /// The GCC ABI superclass message lookup function. Takes a pointer to a
834 /// structure describing the receiver and the class, and a selector as
835 /// arguments. Returns the IMP for the corresponding method.
836 LazyRuntimeFunction MsgLookupSuperFn, MsgLookupSuperFnSRet;
838 llvm::Value *LookupIMP(CodeGenFunction &CGF, llvm::Value *&Receiver,
839 llvm::Value *cmd, llvm::MDNode *node,
840 MessageSendInfo &MSI) override {
841 CGBuilderTy &Builder = CGF.Builder;
842 llvm::Value *args[] = {
843 EnforceType(Builder, Receiver, IdTy),
844 EnforceType(Builder, cmd, SelectorTy) };
847 if (CGM.ReturnTypeUsesSRet(MSI.CallInfo))
848 imp = CGF.EmitRuntimeCallOrInvoke(MsgLookupFnSRet, args);
850 imp = CGF.EmitRuntimeCallOrInvoke(MsgLookupFn, args);
852 imp->setMetadata(msgSendMDKind, node);
853 return imp.getInstruction();
856 llvm::Value *LookupIMPSuper(CodeGenFunction &CGF, Address ObjCSuper,
857 llvm::Value *cmd, MessageSendInfo &MSI) override {
858 CGBuilderTy &Builder = CGF.Builder;
859 llvm::Value *lookupArgs[] = {
860 EnforceType(Builder, ObjCSuper.getPointer(), PtrToObjCSuperTy), cmd,
863 if (CGM.ReturnTypeUsesSRet(MSI.CallInfo))
864 return CGF.EmitNounwindRuntimeCall(MsgLookupSuperFnSRet, lookupArgs);
866 return CGF.EmitNounwindRuntimeCall(MsgLookupSuperFn, lookupArgs);
869 llvm::Value *GetClassNamed(CodeGenFunction &CGF, const std::string &Name,
870 bool isWeak) override {
872 return CGObjCGNU::GetClassNamed(CGF, Name, isWeak);
875 std::string SymbolName = "_OBJC_CLASS_" + Name;
876 llvm::GlobalVariable *ClassSymbol = TheModule.getGlobalVariable(SymbolName);
878 ClassSymbol = new llvm::GlobalVariable(TheModule, LongTy, false,
879 llvm::GlobalValue::ExternalLinkage,
880 nullptr, SymbolName);
885 CGObjCObjFW(CodeGenModule &Mod): CGObjCGNU(Mod, 9, 3) {
886 // IMP objc_msg_lookup(id, SEL);
887 MsgLookupFn.init(&CGM, "objc_msg_lookup", IMPTy, IdTy, SelectorTy, nullptr);
888 MsgLookupFnSRet.init(&CGM, "objc_msg_lookup_stret", IMPTy, IdTy,
889 SelectorTy, nullptr);
890 // IMP objc_msg_lookup_super(struct objc_super*, SEL);
891 MsgLookupSuperFn.init(&CGM, "objc_msg_lookup_super", IMPTy,
892 PtrToObjCSuperTy, SelectorTy, nullptr);
893 MsgLookupSuperFnSRet.init(&CGM, "objc_msg_lookup_super_stret", IMPTy,
894 PtrToObjCSuperTy, SelectorTy, nullptr);
897 } // end anonymous namespace
899 /// Emits a reference to a dummy variable which is emitted with each class.
900 /// This ensures that a linker error will be generated when trying to link
901 /// together modules where a referenced class is not defined.
902 void CGObjCGNU::EmitClassRef(const std::string &className) {
903 std::string symbolRef = "__objc_class_ref_" + className;
904 // Don't emit two copies of the same symbol
905 if (TheModule.getGlobalVariable(symbolRef))
907 std::string symbolName = "__objc_class_name_" + className;
908 llvm::GlobalVariable *ClassSymbol = TheModule.getGlobalVariable(symbolName);
910 ClassSymbol = new llvm::GlobalVariable(TheModule, LongTy, false,
911 llvm::GlobalValue::ExternalLinkage,
912 nullptr, symbolName);
914 new llvm::GlobalVariable(TheModule, ClassSymbol->getType(), true,
915 llvm::GlobalValue::WeakAnyLinkage, ClassSymbol, symbolRef);
918 static std::string SymbolNameForMethod( StringRef ClassName,
919 StringRef CategoryName, const Selector MethodName,
920 bool isClassMethod) {
921 std::string MethodNameColonStripped = MethodName.getAsString();
922 std::replace(MethodNameColonStripped.begin(), MethodNameColonStripped.end(),
924 return (Twine(isClassMethod ? "_c_" : "_i_") + ClassName + "_" +
925 CategoryName + "_" + MethodNameColonStripped).str();
928 CGObjCGNU::CGObjCGNU(CodeGenModule &cgm, unsigned runtimeABIVersion,
929 unsigned protocolClassVersion)
930 : CGObjCRuntime(cgm), TheModule(CGM.getModule()),
931 VMContext(cgm.getLLVMContext()), ClassPtrAlias(nullptr),
932 MetaClassPtrAlias(nullptr), RuntimeVersion(runtimeABIVersion),
933 ProtocolVersion(protocolClassVersion) {
935 msgSendMDKind = VMContext.getMDKindID("GNUObjCMessageSend");
937 CodeGenTypes &Types = CGM.getTypes();
938 IntTy = cast<llvm::IntegerType>(
939 Types.ConvertType(CGM.getContext().IntTy));
940 LongTy = cast<llvm::IntegerType>(
941 Types.ConvertType(CGM.getContext().LongTy));
942 SizeTy = cast<llvm::IntegerType>(
943 Types.ConvertType(CGM.getContext().getSizeType()));
944 PtrDiffTy = cast<llvm::IntegerType>(
945 Types.ConvertType(CGM.getContext().getPointerDiffType()));
946 BoolTy = CGM.getTypes().ConvertType(CGM.getContext().BoolTy);
948 Int8Ty = llvm::Type::getInt8Ty(VMContext);
949 // C string type. Used in lots of places.
950 PtrToInt8Ty = llvm::PointerType::getUnqual(Int8Ty);
952 Zeros[0] = llvm::ConstantInt::get(LongTy, 0);
954 NULLPtr = llvm::ConstantPointerNull::get(PtrToInt8Ty);
955 // Get the selector Type.
956 QualType selTy = CGM.getContext().getObjCSelType();
957 if (QualType() == selTy) {
958 SelectorTy = PtrToInt8Ty;
960 SelectorTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(selTy));
963 PtrToIntTy = llvm::PointerType::getUnqual(IntTy);
966 Int32Ty = llvm::Type::getInt32Ty(VMContext);
967 Int64Ty = llvm::Type::getInt64Ty(VMContext);
970 CGM.getDataLayout().getPointerSizeInBits() == 32 ? Int32Ty : Int64Ty;
973 QualType UnqualIdTy = CGM.getContext().getObjCIdType();
974 ASTIdTy = CanQualType();
975 if (UnqualIdTy != QualType()) {
976 ASTIdTy = CGM.getContext().getCanonicalType(UnqualIdTy);
977 IdTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(ASTIdTy));
981 PtrToIdTy = llvm::PointerType::getUnqual(IdTy);
983 ObjCSuperTy = llvm::StructType::get(IdTy, IdTy, nullptr);
984 PtrToObjCSuperTy = llvm::PointerType::getUnqual(ObjCSuperTy);
986 llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext);
988 // void objc_exception_throw(id);
989 ExceptionThrowFn.init(&CGM, "objc_exception_throw", VoidTy, IdTy, nullptr);
990 ExceptionReThrowFn.init(&CGM, "objc_exception_throw", VoidTy, IdTy, nullptr);
991 // int objc_sync_enter(id);
992 SyncEnterFn.init(&CGM, "objc_sync_enter", IntTy, IdTy, nullptr);
993 // int objc_sync_exit(id);
994 SyncExitFn.init(&CGM, "objc_sync_exit", IntTy, IdTy, nullptr);
996 // void objc_enumerationMutation (id)
997 EnumerationMutationFn.init(&CGM, "objc_enumerationMutation", VoidTy,
1000 // id objc_getProperty(id, SEL, ptrdiff_t, BOOL)
1001 GetPropertyFn.init(&CGM, "objc_getProperty", IdTy, IdTy, SelectorTy,
1002 PtrDiffTy, BoolTy, nullptr);
1003 // void objc_setProperty(id, SEL, ptrdiff_t, id, BOOL, BOOL)
1004 SetPropertyFn.init(&CGM, "objc_setProperty", VoidTy, IdTy, SelectorTy,
1005 PtrDiffTy, IdTy, BoolTy, BoolTy, nullptr);
1006 // void objc_setPropertyStruct(void*, void*, ptrdiff_t, BOOL, BOOL)
1007 GetStructPropertyFn.init(&CGM, "objc_getPropertyStruct", VoidTy, PtrTy, PtrTy,
1008 PtrDiffTy, BoolTy, BoolTy, nullptr);
1009 // void objc_setPropertyStruct(void*, void*, ptrdiff_t, BOOL, BOOL)
1010 SetStructPropertyFn.init(&CGM, "objc_setPropertyStruct", VoidTy, PtrTy, PtrTy,
1011 PtrDiffTy, BoolTy, BoolTy, nullptr);
1014 llvm::Type *IMPArgs[] = { IdTy, SelectorTy };
1015 IMPTy = llvm::PointerType::getUnqual(llvm::FunctionType::get(IdTy, IMPArgs,
1018 const LangOptions &Opts = CGM.getLangOpts();
1019 if ((Opts.getGC() != LangOptions::NonGC) || Opts.ObjCAutoRefCount)
1020 RuntimeVersion = 10;
1022 // Don't bother initialising the GC stuff unless we're compiling in GC mode
1023 if (Opts.getGC() != LangOptions::NonGC) {
1024 // This is a bit of an hack. We should sort this out by having a proper
1025 // CGObjCGNUstep subclass for GC, but we may want to really support the old
1026 // ABI and GC added in ObjectiveC2.framework, so we fudge it a bit for now
1027 // Get selectors needed in GC mode
1028 RetainSel = GetNullarySelector("retain", CGM.getContext());
1029 ReleaseSel = GetNullarySelector("release", CGM.getContext());
1030 AutoreleaseSel = GetNullarySelector("autorelease", CGM.getContext());
1032 // Get functions needed in GC mode
1034 // id objc_assign_ivar(id, id, ptrdiff_t);
1035 IvarAssignFn.init(&CGM, "objc_assign_ivar", IdTy, IdTy, IdTy, PtrDiffTy,
1037 // id objc_assign_strongCast (id, id*)
1038 StrongCastAssignFn.init(&CGM, "objc_assign_strongCast", IdTy, IdTy,
1039 PtrToIdTy, nullptr);
1040 // id objc_assign_global(id, id*);
1041 GlobalAssignFn.init(&CGM, "objc_assign_global", IdTy, IdTy, PtrToIdTy,
1043 // id objc_assign_weak(id, id*);
1044 WeakAssignFn.init(&CGM, "objc_assign_weak", IdTy, IdTy, PtrToIdTy, nullptr);
1045 // id objc_read_weak(id*);
1046 WeakReadFn.init(&CGM, "objc_read_weak", IdTy, PtrToIdTy, nullptr);
1047 // void *objc_memmove_collectable(void*, void *, size_t);
1048 MemMoveFn.init(&CGM, "objc_memmove_collectable", PtrTy, PtrTy, PtrTy,
1053 llvm::Value *CGObjCGNU::GetClassNamed(CodeGenFunction &CGF,
1054 const std::string &Name, bool isWeak) {
1055 llvm::Constant *ClassName = MakeConstantString(Name);
1056 // With the incompatible ABI, this will need to be replaced with a direct
1057 // reference to the class symbol. For the compatible nonfragile ABI we are
1058 // still performing this lookup at run time but emitting the symbol for the
1059 // class externally so that we can make the switch later.
1061 // Libobjc2 contains an LLVM pass that replaces calls to objc_lookup_class
1062 // with memoized versions or with static references if it's safe to do so.
1066 llvm::Constant *ClassLookupFn =
1067 CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, PtrToInt8Ty, true),
1068 "objc_lookup_class");
1069 return CGF.EmitNounwindRuntimeCall(ClassLookupFn, ClassName);
1072 // This has to perform the lookup every time, since posing and related
1073 // techniques can modify the name -> class mapping.
1074 llvm::Value *CGObjCGNU::GetClass(CodeGenFunction &CGF,
1075 const ObjCInterfaceDecl *OID) {
1077 GetClassNamed(CGF, OID->getNameAsString(), OID->isWeakImported());
1078 if (CGM.getTriple().isOSBinFormatCOFF()) {
1079 if (auto *ClassSymbol = dyn_cast<llvm::GlobalVariable>(Value)) {
1080 auto DLLStorage = llvm::GlobalValue::DefaultStorageClass;
1081 if (OID->hasAttr<DLLExportAttr>())
1082 DLLStorage = llvm::GlobalValue::DLLExportStorageClass;
1083 else if (OID->hasAttr<DLLImportAttr>())
1084 DLLStorage = llvm::GlobalValue::DLLImportStorageClass;
1085 ClassSymbol->setDLLStorageClass(DLLStorage);
1091 llvm::Value *CGObjCGNU::EmitNSAutoreleasePoolClassRef(CodeGenFunction &CGF) {
1092 auto *Value = GetClassNamed(CGF, "NSAutoreleasePool", false);
1093 if (CGM.getTriple().isOSBinFormatCOFF()) {
1094 if (auto *ClassSymbol = dyn_cast<llvm::GlobalVariable>(Value)) {
1095 IdentifierInfo &II = CGF.CGM.getContext().Idents.get("NSAutoreleasePool");
1096 TranslationUnitDecl *TUDecl = CGM.getContext().getTranslationUnitDecl();
1097 DeclContext *DC = TranslationUnitDecl::castToDeclContext(TUDecl);
1099 const VarDecl *VD = nullptr;
1100 for (const auto &Result : DC->lookup(&II))
1101 if ((VD = dyn_cast<VarDecl>(Result)))
1104 auto DLLStorage = llvm::GlobalValue::DefaultStorageClass;
1105 if (!VD || VD->hasAttr<DLLImportAttr>())
1106 DLLStorage = llvm::GlobalValue::DLLImportStorageClass;
1107 else if (VD->hasAttr<DLLExportAttr>())
1108 DLLStorage = llvm::GlobalValue::DLLExportStorageClass;
1110 ClassSymbol->setDLLStorageClass(DLLStorage);
1116 llvm::Value *CGObjCGNU::GetSelector(CodeGenFunction &CGF, Selector Sel,
1117 const std::string &TypeEncoding) {
1118 SmallVectorImpl<TypedSelector> &Types = SelectorTable[Sel];
1119 llvm::GlobalAlias *SelValue = nullptr;
1121 for (SmallVectorImpl<TypedSelector>::iterator i = Types.begin(),
1122 e = Types.end() ; i!=e ; i++) {
1123 if (i->first == TypeEncoding) {
1124 SelValue = i->second;
1129 SelValue = llvm::GlobalAlias::create(
1130 SelectorTy->getElementType(), 0, llvm::GlobalValue::PrivateLinkage,
1131 ".objc_selector_" + Sel.getAsString(), &TheModule);
1132 Types.emplace_back(TypeEncoding, SelValue);
1138 Address CGObjCGNU::GetAddrOfSelector(CodeGenFunction &CGF, Selector Sel) {
1139 llvm::Value *SelValue = GetSelector(CGF, Sel);
1141 // Store it to a temporary. Does this satisfy the semantics of
1142 // GetAddrOfSelector? Hopefully.
1143 Address tmp = CGF.CreateTempAlloca(SelValue->getType(),
1144 CGF.getPointerAlign());
1145 CGF.Builder.CreateStore(SelValue, tmp);
1149 llvm::Value *CGObjCGNU::GetSelector(CodeGenFunction &CGF, Selector Sel) {
1150 return GetSelector(CGF, Sel, std::string());
1153 llvm::Value *CGObjCGNU::GetSelector(CodeGenFunction &CGF,
1154 const ObjCMethodDecl *Method) {
1155 std::string SelTypes;
1156 CGM.getContext().getObjCEncodingForMethodDecl(Method, SelTypes);
1157 return GetSelector(CGF, Method->getSelector(), SelTypes);
1160 llvm::Constant *CGObjCGNU::GetEHType(QualType T) {
1161 if (T->isObjCIdType() || T->isObjCQualifiedIdType()) {
1162 // With the old ABI, there was only one kind of catchall, which broke
1163 // foreign exceptions. With the new ABI, we use __objc_id_typeinfo as
1164 // a pointer indicating object catchalls, and NULL to indicate real
1166 if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) {
1167 return MakeConstantString("@id");
1173 // All other types should be Objective-C interface pointer types.
1174 const ObjCObjectPointerType *OPT = T->getAs<ObjCObjectPointerType>();
1175 assert(OPT && "Invalid @catch type.");
1176 const ObjCInterfaceDecl *IDecl = OPT->getObjectType()->getInterface();
1177 assert(IDecl && "Invalid @catch type.");
1178 return MakeConstantString(IDecl->getIdentifier()->getName());
1181 llvm::Constant *CGObjCGNUstep::GetEHType(QualType T) {
1182 if (!CGM.getLangOpts().CPlusPlus)
1183 return CGObjCGNU::GetEHType(T);
1185 // For Objective-C++, we want to provide the ability to catch both C++ and
1186 // Objective-C objects in the same function.
1188 // There's a particular fixed type info for 'id'.
1189 if (T->isObjCIdType() ||
1190 T->isObjCQualifiedIdType()) {
1191 llvm::Constant *IDEHType =
1192 CGM.getModule().getGlobalVariable("__objc_id_type_info");
1195 new llvm::GlobalVariable(CGM.getModule(), PtrToInt8Ty,
1197 llvm::GlobalValue::ExternalLinkage,
1198 nullptr, "__objc_id_type_info");
1199 return llvm::ConstantExpr::getBitCast(IDEHType, PtrToInt8Ty);
1202 const ObjCObjectPointerType *PT =
1203 T->getAs<ObjCObjectPointerType>();
1204 assert(PT && "Invalid @catch type.");
1205 const ObjCInterfaceType *IT = PT->getInterfaceType();
1206 assert(IT && "Invalid @catch type.");
1207 std::string className = IT->getDecl()->getIdentifier()->getName();
1209 std::string typeinfoName = "__objc_eh_typeinfo_" + className;
1211 // Return the existing typeinfo if it exists
1212 llvm::Constant *typeinfo = TheModule.getGlobalVariable(typeinfoName);
1214 return llvm::ConstantExpr::getBitCast(typeinfo, PtrToInt8Ty);
1216 // Otherwise create it.
1218 // vtable for gnustep::libobjc::__objc_class_type_info
1219 // It's quite ugly hard-coding this. Ideally we'd generate it using the host
1220 // platform's name mangling.
1221 const char *vtableName = "_ZTVN7gnustep7libobjc22__objc_class_type_infoE";
1222 auto *Vtable = TheModule.getGlobalVariable(vtableName);
1224 Vtable = new llvm::GlobalVariable(TheModule, PtrToInt8Ty, true,
1225 llvm::GlobalValue::ExternalLinkage,
1226 nullptr, vtableName);
1228 llvm::Constant *Two = llvm::ConstantInt::get(IntTy, 2);
1229 auto *BVtable = llvm::ConstantExpr::getBitCast(
1230 llvm::ConstantExpr::getGetElementPtr(Vtable->getValueType(), Vtable, Two),
1233 llvm::Constant *typeName =
1234 ExportUniqueString(className, "__objc_eh_typename_");
1236 std::vector<llvm::Constant*> fields;
1237 fields.push_back(BVtable);
1238 fields.push_back(typeName);
1239 llvm::Constant *TI =
1240 MakeGlobal(llvm::StructType::get(PtrToInt8Ty, PtrToInt8Ty, nullptr),
1241 fields, CGM.getPointerAlign(),
1242 "__objc_eh_typeinfo_" + className,
1243 llvm::GlobalValue::LinkOnceODRLinkage);
1244 return llvm::ConstantExpr::getBitCast(TI, PtrToInt8Ty);
1247 /// Generate an NSConstantString object.
1248 ConstantAddress CGObjCGNU::GenerateConstantString(const StringLiteral *SL) {
1250 std::string Str = SL->getString().str();
1251 CharUnits Align = CGM.getPointerAlign();
1253 // Look for an existing one
1254 llvm::StringMap<llvm::Constant*>::iterator old = ObjCStrings.find(Str);
1255 if (old != ObjCStrings.end())
1256 return ConstantAddress(old->getValue(), Align);
1258 StringRef StringClass = CGM.getLangOpts().ObjCConstantStringClass;
1260 if (StringClass.empty()) StringClass = "NXConstantString";
1262 std::string Sym = "_OBJC_CLASS_";
1265 llvm::Constant *isa = TheModule.getNamedGlobal(Sym);
1268 isa = new llvm::GlobalVariable(TheModule, IdTy, /* isConstant */false,
1269 llvm::GlobalValue::ExternalWeakLinkage, nullptr, Sym);
1270 else if (isa->getType() != PtrToIdTy)
1271 isa = llvm::ConstantExpr::getBitCast(isa, PtrToIdTy);
1273 std::vector<llvm::Constant*> Ivars;
1274 Ivars.push_back(isa);
1275 Ivars.push_back(MakeConstantString(Str));
1276 Ivars.push_back(llvm::ConstantInt::get(IntTy, Str.size()));
1277 llvm::Constant *ObjCStr = MakeGlobal(
1278 llvm::StructType::get(PtrToIdTy, PtrToInt8Ty, IntTy, nullptr),
1279 Ivars, Align, ".objc_str");
1280 ObjCStr = llvm::ConstantExpr::getBitCast(ObjCStr, PtrToInt8Ty);
1281 ObjCStrings[Str] = ObjCStr;
1282 ConstantStrings.push_back(ObjCStr);
1283 return ConstantAddress(ObjCStr, Align);
1286 ///Generates a message send where the super is the receiver. This is a message
1287 ///send to self with special delivery semantics indicating which class's method
1288 ///should be called.
1290 CGObjCGNU::GenerateMessageSendSuper(CodeGenFunction &CGF,
1291 ReturnValueSlot Return,
1292 QualType ResultType,
1294 const ObjCInterfaceDecl *Class,
1295 bool isCategoryImpl,
1296 llvm::Value *Receiver,
1297 bool IsClassMessage,
1298 const CallArgList &CallArgs,
1299 const ObjCMethodDecl *Method) {
1300 CGBuilderTy &Builder = CGF.Builder;
1301 if (CGM.getLangOpts().getGC() == LangOptions::GCOnly) {
1302 if (Sel == RetainSel || Sel == AutoreleaseSel) {
1303 return RValue::get(EnforceType(Builder, Receiver,
1304 CGM.getTypes().ConvertType(ResultType)));
1306 if (Sel == ReleaseSel) {
1307 return RValue::get(nullptr);
1311 llvm::Value *cmd = GetSelector(CGF, Sel);
1312 CallArgList ActualArgs;
1314 ActualArgs.add(RValue::get(EnforceType(Builder, Receiver, IdTy)), ASTIdTy);
1315 ActualArgs.add(RValue::get(cmd), CGF.getContext().getObjCSelType());
1316 ActualArgs.addFrom(CallArgs);
1318 MessageSendInfo MSI = getMessageSendInfo(Method, ResultType, ActualArgs);
1320 llvm::Value *ReceiverClass = nullptr;
1321 if (isCategoryImpl) {
1322 llvm::Constant *classLookupFunction = nullptr;
1323 if (IsClassMessage) {
1324 classLookupFunction = CGM.CreateRuntimeFunction(llvm::FunctionType::get(
1325 IdTy, PtrTy, true), "objc_get_meta_class");
1327 classLookupFunction = CGM.CreateRuntimeFunction(llvm::FunctionType::get(
1328 IdTy, PtrTy, true), "objc_get_class");
1330 ReceiverClass = Builder.CreateCall(classLookupFunction,
1331 MakeConstantString(Class->getNameAsString()));
1333 // Set up global aliases for the metaclass or class pointer if they do not
1334 // already exist. These will are forward-references which will be set to
1335 // pointers to the class and metaclass structure created for the runtime
1336 // load function. To send a message to super, we look up the value of the
1337 // super_class pointer from either the class or metaclass structure.
1338 if (IsClassMessage) {
1339 if (!MetaClassPtrAlias) {
1340 MetaClassPtrAlias = llvm::GlobalAlias::create(
1341 IdTy->getElementType(), 0, llvm::GlobalValue::InternalLinkage,
1342 ".objc_metaclass_ref" + Class->getNameAsString(), &TheModule);
1344 ReceiverClass = MetaClassPtrAlias;
1346 if (!ClassPtrAlias) {
1347 ClassPtrAlias = llvm::GlobalAlias::create(
1348 IdTy->getElementType(), 0, llvm::GlobalValue::InternalLinkage,
1349 ".objc_class_ref" + Class->getNameAsString(), &TheModule);
1351 ReceiverClass = ClassPtrAlias;
1354 // Cast the pointer to a simplified version of the class structure
1355 llvm::Type *CastTy = llvm::StructType::get(IdTy, IdTy, nullptr);
1356 ReceiverClass = Builder.CreateBitCast(ReceiverClass,
1357 llvm::PointerType::getUnqual(CastTy));
1358 // Get the superclass pointer
1359 ReceiverClass = Builder.CreateStructGEP(CastTy, ReceiverClass, 1);
1360 // Load the superclass pointer
1362 Builder.CreateAlignedLoad(ReceiverClass, CGF.getPointerAlign());
1363 // Construct the structure used to look up the IMP
1364 llvm::StructType *ObjCSuperTy = llvm::StructType::get(
1365 Receiver->getType(), IdTy, nullptr);
1367 // FIXME: Is this really supposed to be a dynamic alloca?
1368 Address ObjCSuper = Address(Builder.CreateAlloca(ObjCSuperTy),
1369 CGF.getPointerAlign());
1371 Builder.CreateStore(Receiver,
1372 Builder.CreateStructGEP(ObjCSuper, 0, CharUnits::Zero()));
1373 Builder.CreateStore(ReceiverClass,
1374 Builder.CreateStructGEP(ObjCSuper, 1, CGF.getPointerSize()));
1376 ObjCSuper = EnforceType(Builder, ObjCSuper, PtrToObjCSuperTy);
1379 llvm::Value *imp = LookupIMPSuper(CGF, ObjCSuper, cmd, MSI);
1380 imp = EnforceType(Builder, imp, MSI.MessengerType);
1382 llvm::Metadata *impMD[] = {
1383 llvm::MDString::get(VMContext, Sel.getAsString()),
1384 llvm::MDString::get(VMContext, Class->getSuperClass()->getNameAsString()),
1385 llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
1386 llvm::Type::getInt1Ty(VMContext), IsClassMessage))};
1387 llvm::MDNode *node = llvm::MDNode::get(VMContext, impMD);
1389 llvm::Instruction *call;
1390 RValue msgRet = CGF.EmitCall(MSI.CallInfo, imp, Return, ActualArgs,
1391 CGCalleeInfo(), &call);
1392 call->setMetadata(msgSendMDKind, node);
1396 /// Generate code for a message send expression.
1398 CGObjCGNU::GenerateMessageSend(CodeGenFunction &CGF,
1399 ReturnValueSlot Return,
1400 QualType ResultType,
1402 llvm::Value *Receiver,
1403 const CallArgList &CallArgs,
1404 const ObjCInterfaceDecl *Class,
1405 const ObjCMethodDecl *Method) {
1406 CGBuilderTy &Builder = CGF.Builder;
1408 // Strip out message sends to retain / release in GC mode
1409 if (CGM.getLangOpts().getGC() == LangOptions::GCOnly) {
1410 if (Sel == RetainSel || Sel == AutoreleaseSel) {
1411 return RValue::get(EnforceType(Builder, Receiver,
1412 CGM.getTypes().ConvertType(ResultType)));
1414 if (Sel == ReleaseSel) {
1415 return RValue::get(nullptr);
1419 // If the return type is something that goes in an integer register, the
1420 // runtime will handle 0 returns. For other cases, we fill in the 0 value
1423 // The language spec says the result of this kind of message send is
1424 // undefined, but lots of people seem to have forgotten to read that
1425 // paragraph and insist on sending messages to nil that have structure
1426 // returns. With GCC, this generates a random return value (whatever happens
1427 // to be on the stack / in those registers at the time) on most platforms,
1428 // and generates an illegal instruction trap on SPARC. With LLVM it corrupts
1430 bool isPointerSizedReturn = (ResultType->isAnyPointerType() ||
1431 ResultType->isIntegralOrEnumerationType() || ResultType->isVoidType());
1433 llvm::BasicBlock *startBB = nullptr;
1434 llvm::BasicBlock *messageBB = nullptr;
1435 llvm::BasicBlock *continueBB = nullptr;
1437 if (!isPointerSizedReturn) {
1438 startBB = Builder.GetInsertBlock();
1439 messageBB = CGF.createBasicBlock("msgSend");
1440 continueBB = CGF.createBasicBlock("continue");
1442 llvm::Value *isNil = Builder.CreateICmpEQ(Receiver,
1443 llvm::Constant::getNullValue(Receiver->getType()));
1444 Builder.CreateCondBr(isNil, continueBB, messageBB);
1445 CGF.EmitBlock(messageBB);
1448 IdTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(ASTIdTy));
1451 cmd = GetSelector(CGF, Method);
1453 cmd = GetSelector(CGF, Sel);
1454 cmd = EnforceType(Builder, cmd, SelectorTy);
1455 Receiver = EnforceType(Builder, Receiver, IdTy);
1457 llvm::Metadata *impMD[] = {
1458 llvm::MDString::get(VMContext, Sel.getAsString()),
1459 llvm::MDString::get(VMContext, Class ? Class->getNameAsString() : ""),
1460 llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
1461 llvm::Type::getInt1Ty(VMContext), Class != nullptr))};
1462 llvm::MDNode *node = llvm::MDNode::get(VMContext, impMD);
1464 CallArgList ActualArgs;
1465 ActualArgs.add(RValue::get(Receiver), ASTIdTy);
1466 ActualArgs.add(RValue::get(cmd), CGF.getContext().getObjCSelType());
1467 ActualArgs.addFrom(CallArgs);
1469 MessageSendInfo MSI = getMessageSendInfo(Method, ResultType, ActualArgs);
1471 // Get the IMP to call
1474 // If we have non-legacy dispatch specified, we try using the objc_msgSend()
1475 // functions. These are not supported on all platforms (or all runtimes on a
1476 // given platform), so we
1477 switch (CGM.getCodeGenOpts().getObjCDispatchMethod()) {
1478 case CodeGenOptions::Legacy:
1479 imp = LookupIMP(CGF, Receiver, cmd, node, MSI);
1481 case CodeGenOptions::Mixed:
1482 case CodeGenOptions::NonLegacy:
1483 if (CGM.ReturnTypeUsesFPRet(ResultType)) {
1484 imp = CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, IdTy, true),
1485 "objc_msgSend_fpret");
1486 } else if (CGM.ReturnTypeUsesSRet(MSI.CallInfo)) {
1487 // The actual types here don't matter - we're going to bitcast the
1489 imp = CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, IdTy, true),
1490 "objc_msgSend_stret");
1492 imp = CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, IdTy, true),
1497 // Reset the receiver in case the lookup modified it
1498 ActualArgs[0] = CallArg(RValue::get(Receiver), ASTIdTy, false);
1500 imp = EnforceType(Builder, imp, MSI.MessengerType);
1502 llvm::Instruction *call;
1503 RValue msgRet = CGF.EmitCall(MSI.CallInfo, imp, Return, ActualArgs,
1504 CGCalleeInfo(), &call);
1505 call->setMetadata(msgSendMDKind, node);
1508 if (!isPointerSizedReturn) {
1509 messageBB = CGF.Builder.GetInsertBlock();
1510 CGF.Builder.CreateBr(continueBB);
1511 CGF.EmitBlock(continueBB);
1512 if (msgRet.isScalar()) {
1513 llvm::Value *v = msgRet.getScalarVal();
1514 llvm::PHINode *phi = Builder.CreatePHI(v->getType(), 2);
1515 phi->addIncoming(v, messageBB);
1516 phi->addIncoming(llvm::Constant::getNullValue(v->getType()), startBB);
1517 msgRet = RValue::get(phi);
1518 } else if (msgRet.isAggregate()) {
1519 Address v = msgRet.getAggregateAddress();
1520 llvm::PHINode *phi = Builder.CreatePHI(v.getType(), 2);
1521 llvm::Type *RetTy = v.getElementType();
1522 Address NullVal = CGF.CreateTempAlloca(RetTy, v.getAlignment(), "null");
1523 CGF.InitTempAlloca(NullVal, llvm::Constant::getNullValue(RetTy));
1524 phi->addIncoming(v.getPointer(), messageBB);
1525 phi->addIncoming(NullVal.getPointer(), startBB);
1526 msgRet = RValue::getAggregate(Address(phi, v.getAlignment()));
1527 } else /* isComplex() */ {
1528 std::pair<llvm::Value*,llvm::Value*> v = msgRet.getComplexVal();
1529 llvm::PHINode *phi = Builder.CreatePHI(v.first->getType(), 2);
1530 phi->addIncoming(v.first, messageBB);
1531 phi->addIncoming(llvm::Constant::getNullValue(v.first->getType()),
1533 llvm::PHINode *phi2 = Builder.CreatePHI(v.second->getType(), 2);
1534 phi2->addIncoming(v.second, messageBB);
1535 phi2->addIncoming(llvm::Constant::getNullValue(v.second->getType()),
1537 msgRet = RValue::getComplex(phi, phi2);
1543 /// Generates a MethodList. Used in construction of a objc_class and
1544 /// objc_category structures.
1545 llvm::Constant *CGObjCGNU::
1546 GenerateMethodList(StringRef ClassName,
1547 StringRef CategoryName,
1548 ArrayRef<Selector> MethodSels,
1549 ArrayRef<llvm::Constant *> MethodTypes,
1550 bool isClassMethodList) {
1551 if (MethodSels.empty())
1553 // Get the method structure type.
1554 llvm::StructType *ObjCMethodTy = llvm::StructType::get(
1555 PtrToInt8Ty, // Really a selector, but the runtime creates it us.
1556 PtrToInt8Ty, // Method types
1557 IMPTy, //Method pointer
1559 std::vector<llvm::Constant*> Methods;
1560 for (unsigned int i = 0, e = MethodTypes.size(); i < e; ++i) {
1561 llvm::Constant *Method =
1562 TheModule.getFunction(SymbolNameForMethod(ClassName, CategoryName,
1564 isClassMethodList));
1565 assert(Method && "Can't generate metadata for method that doesn't exist");
1566 llvm::Constant *C = MakeConstantString(MethodSels[i].getAsString());
1567 Method = llvm::ConstantExpr::getBitCast(Method,
1570 llvm::ConstantStruct::get(ObjCMethodTy, {C, MethodTypes[i], Method}));
1573 // Array of method structures
1574 llvm::ArrayType *ObjCMethodArrayTy = llvm::ArrayType::get(ObjCMethodTy,
1576 llvm::Constant *MethodArray = llvm::ConstantArray::get(ObjCMethodArrayTy,
1579 // Structure containing list pointer, array and array count
1580 llvm::StructType *ObjCMethodListTy = llvm::StructType::create(VMContext);
1581 llvm::Type *NextPtrTy = llvm::PointerType::getUnqual(ObjCMethodListTy);
1582 ObjCMethodListTy->setBody(
1589 Methods.push_back(llvm::ConstantPointerNull::get(
1590 llvm::PointerType::getUnqual(ObjCMethodListTy)));
1591 Methods.push_back(llvm::ConstantInt::get(Int32Ty, MethodTypes.size()));
1592 Methods.push_back(MethodArray);
1594 // Create an instance of the structure
1595 return MakeGlobal(ObjCMethodListTy, Methods, CGM.getPointerAlign(),
1596 ".objc_method_list");
1599 /// Generates an IvarList. Used in construction of a objc_class.
1600 llvm::Constant *CGObjCGNU::
1601 GenerateIvarList(ArrayRef<llvm::Constant *> IvarNames,
1602 ArrayRef<llvm::Constant *> IvarTypes,
1603 ArrayRef<llvm::Constant *> IvarOffsets) {
1604 if (IvarNames.size() == 0)
1606 // Get the method structure type.
1607 llvm::StructType *ObjCIvarTy = llvm::StructType::get(
1612 std::vector<llvm::Constant*> Ivars;
1613 for (unsigned int i = 0, e = IvarNames.size() ; i < e ; i++) {
1614 Ivars.push_back(llvm::ConstantStruct::get(
1615 ObjCIvarTy, {IvarNames[i], IvarTypes[i], IvarOffsets[i]}));
1618 // Array of method structures
1619 llvm::ArrayType *ObjCIvarArrayTy = llvm::ArrayType::get(ObjCIvarTy,
1622 llvm::Constant *Elements[] = {
1623 llvm::ConstantInt::get(IntTy, (int)IvarNames.size()),
1624 llvm::ConstantArray::get(ObjCIvarArrayTy, Ivars)};
1625 // Structure containing array and array count
1626 llvm::StructType *ObjCIvarListTy = llvm::StructType::get(IntTy,
1630 // Create an instance of the structure
1631 return MakeGlobal(ObjCIvarListTy, Elements, CGM.getPointerAlign(),
1635 /// Generate a class structure
1636 llvm::Constant *CGObjCGNU::GenerateClassStructure(
1637 llvm::Constant *MetaClass,
1638 llvm::Constant *SuperClass,
1641 llvm::Constant *Version,
1642 llvm::Constant *InstanceSize,
1643 llvm::Constant *IVars,
1644 llvm::Constant *Methods,
1645 llvm::Constant *Protocols,
1646 llvm::Constant *IvarOffsets,
1647 llvm::Constant *Properties,
1648 llvm::Constant *StrongIvarBitmap,
1649 llvm::Constant *WeakIvarBitmap,
1651 // Set up the class structure
1652 // Note: Several of these are char*s when they should be ids. This is
1653 // because the runtime performs this translation on load.
1655 // Fields marked New ABI are part of the GNUstep runtime. We emit them
1656 // anyway; the classes will still work with the GNU runtime, they will just
1658 llvm::StructType *ClassTy = llvm::StructType::get(
1660 PtrToInt8Ty, // super_class
1661 PtrToInt8Ty, // name
1664 LongTy, // instance_size
1665 IVars->getType(), // ivars
1666 Methods->getType(), // methods
1667 // These are all filled in by the runtime, so we pretend
1669 PtrTy, // subclass_list
1670 PtrTy, // sibling_class
1672 PtrTy, // gc_object_type
1674 LongTy, // abi_version
1675 IvarOffsets->getType(), // ivar_offsets
1676 Properties->getType(), // properties
1677 IntPtrTy, // strong_pointers
1678 IntPtrTy, // weak_pointers
1680 llvm::Constant *Zero = llvm::ConstantInt::get(LongTy, 0);
1681 // Fill in the structure
1682 std::vector<llvm::Constant*> Elements;
1683 Elements.push_back(llvm::ConstantExpr::getBitCast(MetaClass, PtrToInt8Ty));
1684 Elements.push_back(SuperClass);
1685 Elements.push_back(MakeConstantString(Name, ".class_name"));
1686 Elements.push_back(Zero);
1687 Elements.push_back(llvm::ConstantInt::get(LongTy, info));
1689 llvm::DataLayout td(&TheModule);
1691 llvm::ConstantInt::get(LongTy,
1692 td.getTypeSizeInBits(ClassTy) /
1693 CGM.getContext().getCharWidth()));
1695 Elements.push_back(InstanceSize);
1696 Elements.push_back(IVars);
1697 Elements.push_back(Methods);
1698 Elements.push_back(NULLPtr);
1699 Elements.push_back(NULLPtr);
1700 Elements.push_back(NULLPtr);
1701 Elements.push_back(llvm::ConstantExpr::getBitCast(Protocols, PtrTy));
1702 Elements.push_back(NULLPtr);
1703 Elements.push_back(llvm::ConstantInt::get(LongTy, 1));
1704 Elements.push_back(IvarOffsets);
1705 Elements.push_back(Properties);
1706 Elements.push_back(StrongIvarBitmap);
1707 Elements.push_back(WeakIvarBitmap);
1708 // Create an instance of the structure
1709 // This is now an externally visible symbol, so that we can speed up class
1710 // messages in the next ABI. We may already have some weak references to
1711 // this, so check and fix them properly.
1712 std::string ClassSym((isMeta ? "_OBJC_METACLASS_": "_OBJC_CLASS_") +
1714 llvm::GlobalVariable *ClassRef = TheModule.getNamedGlobal(ClassSym);
1715 llvm::Constant *Class =
1716 MakeGlobal(ClassTy, Elements, CGM.getPointerAlign(), ClassSym,
1717 llvm::GlobalValue::ExternalLinkage);
1719 ClassRef->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(Class,
1720 ClassRef->getType()));
1721 ClassRef->removeFromParent();
1722 Class->setName(ClassSym);
1727 llvm::Constant *CGObjCGNU::
1728 GenerateProtocolMethodList(ArrayRef<llvm::Constant *> MethodNames,
1729 ArrayRef<llvm::Constant *> MethodTypes) {
1730 // Get the method structure type.
1731 llvm::StructType *ObjCMethodDescTy = llvm::StructType::get(
1732 PtrToInt8Ty, // Really a selector, but the runtime does the casting for us.
1735 std::vector<llvm::Constant*> Methods;
1736 for (unsigned int i = 0, e = MethodTypes.size() ; i < e ; i++) {
1737 Methods.push_back(llvm::ConstantStruct::get(
1738 ObjCMethodDescTy, {MethodNames[i], MethodTypes[i]}));
1740 llvm::ArrayType *ObjCMethodArrayTy = llvm::ArrayType::get(ObjCMethodDescTy,
1741 MethodNames.size());
1742 llvm::Constant *Array = llvm::ConstantArray::get(ObjCMethodArrayTy,
1744 llvm::StructType *ObjCMethodDescListTy = llvm::StructType::get(
1745 IntTy, ObjCMethodArrayTy, nullptr);
1747 Methods.push_back(llvm::ConstantInt::get(IntTy, MethodNames.size()));
1748 Methods.push_back(Array);
1749 return MakeGlobal(ObjCMethodDescListTy, Methods, CGM.getPointerAlign(),
1750 ".objc_method_list");
1753 // Create the protocol list structure used in classes, categories and so on
1754 llvm::Constant *CGObjCGNU::GenerateProtocolList(ArrayRef<std::string>Protocols){
1755 llvm::ArrayType *ProtocolArrayTy = llvm::ArrayType::get(PtrToInt8Ty,
1757 llvm::StructType *ProtocolListTy = llvm::StructType::get(
1758 PtrTy, //Should be a recurisve pointer, but it's always NULL here.
1762 std::vector<llvm::Constant*> Elements;
1763 for (const std::string *iter = Protocols.begin(), *endIter = Protocols.end();
1764 iter != endIter ; iter++) {
1765 llvm::Constant *protocol = nullptr;
1766 llvm::StringMap<llvm::Constant*>::iterator value =
1767 ExistingProtocols.find(*iter);
1768 if (value == ExistingProtocols.end()) {
1769 protocol = GenerateEmptyProtocol(*iter);
1771 protocol = value->getValue();
1773 llvm::Constant *Ptr = llvm::ConstantExpr::getBitCast(protocol,
1775 Elements.push_back(Ptr);
1777 llvm::Constant * ProtocolArray = llvm::ConstantArray::get(ProtocolArrayTy,
1780 Elements.push_back(NULLPtr);
1781 Elements.push_back(llvm::ConstantInt::get(LongTy, Protocols.size()));
1782 Elements.push_back(ProtocolArray);
1783 return MakeGlobal(ProtocolListTy, Elements, CGM.getPointerAlign(),
1784 ".objc_protocol_list");
1787 llvm::Value *CGObjCGNU::GenerateProtocolRef(CodeGenFunction &CGF,
1788 const ObjCProtocolDecl *PD) {
1789 llvm::Value *protocol = ExistingProtocols[PD->getNameAsString()];
1791 CGM.getTypes().ConvertType(CGM.getContext().getObjCProtoType());
1792 return CGF.Builder.CreateBitCast(protocol, llvm::PointerType::getUnqual(T));
1795 llvm::Constant *CGObjCGNU::GenerateEmptyProtocol(
1796 const std::string &ProtocolName) {
1797 SmallVector<std::string, 0> EmptyStringVector;
1798 SmallVector<llvm::Constant*, 0> EmptyConstantVector;
1800 llvm::Constant *ProtocolList = GenerateProtocolList(EmptyStringVector);
1801 llvm::Constant *MethodList =
1802 GenerateProtocolMethodList(EmptyConstantVector, EmptyConstantVector);
1803 // Protocols are objects containing lists of the methods implemented and
1804 // protocols adopted.
1805 llvm::StructType *ProtocolTy = llvm::StructType::get(IdTy,
1807 ProtocolList->getType(),
1808 MethodList->getType(),
1809 MethodList->getType(),
1810 MethodList->getType(),
1811 MethodList->getType(),
1813 // The isa pointer must be set to a magic number so the runtime knows it's
1814 // the correct layout.
1815 llvm::Constant *Elements[] = {
1816 llvm::ConstantExpr::getIntToPtr(
1817 llvm::ConstantInt::get(Int32Ty, ProtocolVersion), IdTy),
1818 MakeConstantString(ProtocolName, ".objc_protocol_name"), ProtocolList,
1819 MethodList, MethodList, MethodList, MethodList};
1820 return MakeGlobal(ProtocolTy, Elements, CGM.getPointerAlign(),
1824 void CGObjCGNU::GenerateProtocol(const ObjCProtocolDecl *PD) {
1825 ASTContext &Context = CGM.getContext();
1826 std::string ProtocolName = PD->getNameAsString();
1828 // Use the protocol definition, if there is one.
1829 if (const ObjCProtocolDecl *Def = PD->getDefinition())
1832 SmallVector<std::string, 16> Protocols;
1833 for (const auto *PI : PD->protocols())
1834 Protocols.push_back(PI->getNameAsString());
1835 SmallVector<llvm::Constant*, 16> InstanceMethodNames;
1836 SmallVector<llvm::Constant*, 16> InstanceMethodTypes;
1837 SmallVector<llvm::Constant*, 16> OptionalInstanceMethodNames;
1838 SmallVector<llvm::Constant*, 16> OptionalInstanceMethodTypes;
1839 for (const auto *I : PD->instance_methods()) {
1840 std::string TypeStr;
1841 Context.getObjCEncodingForMethodDecl(I, TypeStr);
1842 if (I->getImplementationControl() == ObjCMethodDecl::Optional) {
1843 OptionalInstanceMethodNames.push_back(
1844 MakeConstantString(I->getSelector().getAsString()));
1845 OptionalInstanceMethodTypes.push_back(MakeConstantString(TypeStr));
1847 InstanceMethodNames.push_back(
1848 MakeConstantString(I->getSelector().getAsString()));
1849 InstanceMethodTypes.push_back(MakeConstantString(TypeStr));
1852 // Collect information about class methods:
1853 SmallVector<llvm::Constant*, 16> ClassMethodNames;
1854 SmallVector<llvm::Constant*, 16> ClassMethodTypes;
1855 SmallVector<llvm::Constant*, 16> OptionalClassMethodNames;
1856 SmallVector<llvm::Constant*, 16> OptionalClassMethodTypes;
1857 for (const auto *I : PD->class_methods()) {
1858 std::string TypeStr;
1859 Context.getObjCEncodingForMethodDecl(I,TypeStr);
1860 if (I->getImplementationControl() == ObjCMethodDecl::Optional) {
1861 OptionalClassMethodNames.push_back(
1862 MakeConstantString(I->getSelector().getAsString()));
1863 OptionalClassMethodTypes.push_back(MakeConstantString(TypeStr));
1865 ClassMethodNames.push_back(
1866 MakeConstantString(I->getSelector().getAsString()));
1867 ClassMethodTypes.push_back(MakeConstantString(TypeStr));
1871 llvm::Constant *ProtocolList = GenerateProtocolList(Protocols);
1872 llvm::Constant *InstanceMethodList =
1873 GenerateProtocolMethodList(InstanceMethodNames, InstanceMethodTypes);
1874 llvm::Constant *ClassMethodList =
1875 GenerateProtocolMethodList(ClassMethodNames, ClassMethodTypes);
1876 llvm::Constant *OptionalInstanceMethodList =
1877 GenerateProtocolMethodList(OptionalInstanceMethodNames,
1878 OptionalInstanceMethodTypes);
1879 llvm::Constant *OptionalClassMethodList =
1880 GenerateProtocolMethodList(OptionalClassMethodNames,
1881 OptionalClassMethodTypes);
1883 // Property metadata: name, attributes, isSynthesized, setter name, setter
1884 // types, getter name, getter types.
1885 // The isSynthesized value is always set to 0 in a protocol. It exists to
1886 // simplify the runtime library by allowing it to use the same data
1887 // structures for protocol metadata everywhere.
1888 llvm::StructType *PropertyMetadataTy = llvm::StructType::get(
1889 PtrToInt8Ty, Int8Ty, Int8Ty, Int8Ty, Int8Ty, PtrToInt8Ty,
1890 PtrToInt8Ty, PtrToInt8Ty, PtrToInt8Ty, nullptr);
1891 std::vector<llvm::Constant*> Properties;
1892 std::vector<llvm::Constant*> OptionalProperties;
1894 // Add all of the property methods need adding to the method list and to the
1895 // property metadata list.
1896 for (auto *property : PD->instance_properties()) {
1897 std::vector<llvm::Constant*> Fields;
1899 Fields.push_back(MakePropertyEncodingString(property, nullptr));
1900 PushPropertyAttributes(Fields, property);
1902 if (ObjCMethodDecl *getter = property->getGetterMethodDecl()) {
1903 std::string TypeStr;
1904 Context.getObjCEncodingForMethodDecl(getter,TypeStr);
1905 llvm::Constant *TypeEncoding = MakeConstantString(TypeStr);
1906 InstanceMethodTypes.push_back(TypeEncoding);
1907 Fields.push_back(MakeConstantString(getter->getSelector().getAsString()));
1908 Fields.push_back(TypeEncoding);
1910 Fields.push_back(NULLPtr);
1911 Fields.push_back(NULLPtr);
1913 if (ObjCMethodDecl *setter = property->getSetterMethodDecl()) {
1914 std::string TypeStr;
1915 Context.getObjCEncodingForMethodDecl(setter,TypeStr);
1916 llvm::Constant *TypeEncoding = MakeConstantString(TypeStr);
1917 InstanceMethodTypes.push_back(TypeEncoding);
1918 Fields.push_back(MakeConstantString(setter->getSelector().getAsString()));
1919 Fields.push_back(TypeEncoding);
1921 Fields.push_back(NULLPtr);
1922 Fields.push_back(NULLPtr);
1924 if (property->getPropertyImplementation() == ObjCPropertyDecl::Optional) {
1925 OptionalProperties.push_back(llvm::ConstantStruct::get(PropertyMetadataTy, Fields));
1927 Properties.push_back(llvm::ConstantStruct::get(PropertyMetadataTy, Fields));
1930 llvm::Constant *PropertyArray = llvm::ConstantArray::get(
1931 llvm::ArrayType::get(PropertyMetadataTy, Properties.size()), Properties);
1932 llvm::Constant* PropertyListInitFields[] =
1933 {llvm::ConstantInt::get(IntTy, Properties.size()), NULLPtr, PropertyArray};
1935 llvm::Constant *PropertyListInit =
1936 llvm::ConstantStruct::getAnon(PropertyListInitFields);
1937 llvm::Constant *PropertyList = new llvm::GlobalVariable(TheModule,
1938 PropertyListInit->getType(), false, llvm::GlobalValue::InternalLinkage,
1939 PropertyListInit, ".objc_property_list");
1941 llvm::Constant *OptionalPropertyArray =
1942 llvm::ConstantArray::get(llvm::ArrayType::get(PropertyMetadataTy,
1943 OptionalProperties.size()) , OptionalProperties);
1944 llvm::Constant* OptionalPropertyListInitFields[] = {
1945 llvm::ConstantInt::get(IntTy, OptionalProperties.size()), NULLPtr,
1946 OptionalPropertyArray };
1948 llvm::Constant *OptionalPropertyListInit =
1949 llvm::ConstantStruct::getAnon(OptionalPropertyListInitFields);
1950 llvm::Constant *OptionalPropertyList = new llvm::GlobalVariable(TheModule,
1951 OptionalPropertyListInit->getType(), false,
1952 llvm::GlobalValue::InternalLinkage, OptionalPropertyListInit,
1953 ".objc_property_list");
1955 // Protocols are objects containing lists of the methods implemented and
1956 // protocols adopted.
1957 llvm::StructType *ProtocolTy = llvm::StructType::get(IdTy,
1959 ProtocolList->getType(),
1960 InstanceMethodList->getType(),
1961 ClassMethodList->getType(),
1962 OptionalInstanceMethodList->getType(),
1963 OptionalClassMethodList->getType(),
1964 PropertyList->getType(),
1965 OptionalPropertyList->getType(),
1967 // The isa pointer must be set to a magic number so the runtime knows it's
1968 // the correct layout.
1969 llvm::Constant *Elements[] = {
1970 llvm::ConstantExpr::getIntToPtr(
1971 llvm::ConstantInt::get(Int32Ty, ProtocolVersion), IdTy),
1972 MakeConstantString(ProtocolName, ".objc_protocol_name"), ProtocolList,
1973 InstanceMethodList, ClassMethodList, OptionalInstanceMethodList,
1974 OptionalClassMethodList, PropertyList, OptionalPropertyList};
1975 ExistingProtocols[ProtocolName] =
1976 llvm::ConstantExpr::getBitCast(MakeGlobal(ProtocolTy, Elements,
1977 CGM.getPointerAlign(), ".objc_protocol"), IdTy);
1979 void CGObjCGNU::GenerateProtocolHolderCategory() {
1980 // Collect information about instance methods
1981 SmallVector<Selector, 1> MethodSels;
1982 SmallVector<llvm::Constant*, 1> MethodTypes;
1984 std::vector<llvm::Constant*> Elements;
1985 const std::string ClassName = "__ObjC_Protocol_Holder_Ugly_Hack";
1986 const std::string CategoryName = "AnotherHack";
1987 Elements.push_back(MakeConstantString(CategoryName));
1988 Elements.push_back(MakeConstantString(ClassName));
1989 // Instance method list
1990 Elements.push_back(llvm::ConstantExpr::getBitCast(GenerateMethodList(
1991 ClassName, CategoryName, MethodSels, MethodTypes, false), PtrTy));
1992 // Class method list
1993 Elements.push_back(llvm::ConstantExpr::getBitCast(GenerateMethodList(
1994 ClassName, CategoryName, MethodSels, MethodTypes, true), PtrTy));
1996 llvm::ArrayType *ProtocolArrayTy = llvm::ArrayType::get(PtrTy,
1997 ExistingProtocols.size());
1998 llvm::StructType *ProtocolListTy = llvm::StructType::get(
1999 PtrTy, //Should be a recurisve pointer, but it's always NULL here.
2003 std::vector<llvm::Constant*> ProtocolElements;
2004 for (llvm::StringMapIterator<llvm::Constant*> iter =
2005 ExistingProtocols.begin(), endIter = ExistingProtocols.end();
2006 iter != endIter ; iter++) {
2007 llvm::Constant *Ptr = llvm::ConstantExpr::getBitCast(iter->getValue(),
2009 ProtocolElements.push_back(Ptr);
2011 llvm::Constant * ProtocolArray = llvm::ConstantArray::get(ProtocolArrayTy,
2013 ProtocolElements.clear();
2014 ProtocolElements.push_back(NULLPtr);
2015 ProtocolElements.push_back(llvm::ConstantInt::get(LongTy,
2016 ExistingProtocols.size()));
2017 ProtocolElements.push_back(ProtocolArray);
2018 Elements.push_back(llvm::ConstantExpr::getBitCast(MakeGlobal(ProtocolListTy,
2019 ProtocolElements, CGM.getPointerAlign(),
2020 ".objc_protocol_list"), PtrTy));
2021 Categories.push_back(llvm::ConstantExpr::getBitCast(
2022 MakeGlobal(llvm::StructType::get(PtrToInt8Ty, PtrToInt8Ty,
2023 PtrTy, PtrTy, PtrTy, nullptr), Elements, CGM.getPointerAlign()),
2027 /// Libobjc2 uses a bitfield representation where small(ish) bitfields are
2028 /// stored in a 64-bit value with the low bit set to 1 and the remaining 63
2029 /// bits set to their values, LSB first, while larger ones are stored in a
2030 /// structure of this / form:
2032 /// struct { int32_t length; int32_t values[length]; };
2034 /// The values in the array are stored in host-endian format, with the least
2035 /// significant bit being assumed to come first in the bitfield. Therefore, a
2036 /// bitfield with the 64th bit set will be (int64_t)&{ 2, [0, 1<<31] }, while a
2037 /// bitfield / with the 63rd bit set will be 1<<64.
2038 llvm::Constant *CGObjCGNU::MakeBitField(ArrayRef<bool> bits) {
2039 int bitCount = bits.size();
2040 int ptrBits = CGM.getDataLayout().getPointerSizeInBits();
2041 if (bitCount < ptrBits) {
2043 for (int i=0 ; i<bitCount ; ++i) {
2044 if (bits[i]) val |= 1ULL<<(i+1);
2046 return llvm::ConstantInt::get(IntPtrTy, val);
2048 SmallVector<llvm::Constant *, 8> values;
2050 while (v < bitCount) {
2052 for (int i=0 ; (i<32) && (v<bitCount) ; ++i) {
2053 if (bits[v]) word |= 1<<i;
2056 values.push_back(llvm::ConstantInt::get(Int32Ty, word));
2058 llvm::ArrayType *arrayTy = llvm::ArrayType::get(Int32Ty, values.size());
2059 llvm::Constant *array = llvm::ConstantArray::get(arrayTy, values);
2060 llvm::Constant *fields[2] = {
2061 llvm::ConstantInt::get(Int32Ty, values.size()),
2063 llvm::Constant *GS = MakeGlobal(llvm::StructType::get(Int32Ty, arrayTy,
2064 nullptr), fields, CharUnits::fromQuantity(4));
2065 llvm::Constant *ptr = llvm::ConstantExpr::getPtrToInt(GS, IntPtrTy);
2069 void CGObjCGNU::GenerateCategory(const ObjCCategoryImplDecl *OCD) {
2070 std::string ClassName = OCD->getClassInterface()->getNameAsString();
2071 std::string CategoryName = OCD->getNameAsString();
2072 // Collect information about instance methods
2073 SmallVector<Selector, 16> InstanceMethodSels;
2074 SmallVector<llvm::Constant*, 16> InstanceMethodTypes;
2075 for (const auto *I : OCD->instance_methods()) {
2076 InstanceMethodSels.push_back(I->getSelector());
2077 std::string TypeStr;
2078 CGM.getContext().getObjCEncodingForMethodDecl(I,TypeStr);
2079 InstanceMethodTypes.push_back(MakeConstantString(TypeStr));
2082 // Collect information about class methods
2083 SmallVector<Selector, 16> ClassMethodSels;
2084 SmallVector<llvm::Constant*, 16> ClassMethodTypes;
2085 for (const auto *I : OCD->class_methods()) {
2086 ClassMethodSels.push_back(I->getSelector());
2087 std::string TypeStr;
2088 CGM.getContext().getObjCEncodingForMethodDecl(I,TypeStr);
2089 ClassMethodTypes.push_back(MakeConstantString(TypeStr));
2092 // Collect the names of referenced protocols
2093 SmallVector<std::string, 16> Protocols;
2094 const ObjCCategoryDecl *CatDecl = OCD->getCategoryDecl();
2095 const ObjCList<ObjCProtocolDecl> &Protos = CatDecl->getReferencedProtocols();
2096 for (ObjCList<ObjCProtocolDecl>::iterator I = Protos.begin(),
2097 E = Protos.end(); I != E; ++I)
2098 Protocols.push_back((*I)->getNameAsString());
2100 llvm::Constant *Elements[] = {
2101 MakeConstantString(CategoryName), MakeConstantString(ClassName),
2102 // Instance method list
2103 llvm::ConstantExpr::getBitCast(
2104 GenerateMethodList(ClassName, CategoryName, InstanceMethodSels,
2105 InstanceMethodTypes, false),
2107 // Class method list
2108 llvm::ConstantExpr::getBitCast(GenerateMethodList(ClassName, CategoryName,
2110 ClassMethodTypes, true),
2113 llvm::ConstantExpr::getBitCast(GenerateProtocolList(Protocols), PtrTy)};
2114 Categories.push_back(llvm::ConstantExpr::getBitCast(
2115 MakeGlobal(llvm::StructType::get(PtrToInt8Ty, PtrToInt8Ty,
2116 PtrTy, PtrTy, PtrTy, nullptr), Elements, CGM.getPointerAlign()),
2120 llvm::Constant *CGObjCGNU::GeneratePropertyList(const ObjCImplementationDecl *OID,
2121 SmallVectorImpl<Selector> &InstanceMethodSels,
2122 SmallVectorImpl<llvm::Constant*> &InstanceMethodTypes) {
2123 ASTContext &Context = CGM.getContext();
2124 // Property metadata: name, attributes, attributes2, padding1, padding2,
2125 // setter name, setter types, getter name, getter types.
2126 llvm::StructType *PropertyMetadataTy = llvm::StructType::get(
2127 PtrToInt8Ty, Int8Ty, Int8Ty, Int8Ty, Int8Ty, PtrToInt8Ty,
2128 PtrToInt8Ty, PtrToInt8Ty, PtrToInt8Ty, nullptr);
2129 std::vector<llvm::Constant*> Properties;
2131 // Add all of the property methods need adding to the method list and to the
2132 // property metadata list.
2133 for (auto *propertyImpl : OID->property_impls()) {
2134 std::vector<llvm::Constant*> Fields;
2135 ObjCPropertyDecl *property = propertyImpl->getPropertyDecl();
2136 bool isSynthesized = (propertyImpl->getPropertyImplementation() ==
2137 ObjCPropertyImplDecl::Synthesize);
2138 bool isDynamic = (propertyImpl->getPropertyImplementation() ==
2139 ObjCPropertyImplDecl::Dynamic);
2141 Fields.push_back(MakePropertyEncodingString(property, OID));
2142 PushPropertyAttributes(Fields, property, isSynthesized, isDynamic);
2143 if (ObjCMethodDecl *getter = property->getGetterMethodDecl()) {
2144 std::string TypeStr;
2145 Context.getObjCEncodingForMethodDecl(getter,TypeStr);
2146 llvm::Constant *TypeEncoding = MakeConstantString(TypeStr);
2147 if (isSynthesized) {
2148 InstanceMethodTypes.push_back(TypeEncoding);
2149 InstanceMethodSels.push_back(getter->getSelector());
2151 Fields.push_back(MakeConstantString(getter->getSelector().getAsString()));
2152 Fields.push_back(TypeEncoding);
2154 Fields.push_back(NULLPtr);
2155 Fields.push_back(NULLPtr);
2157 if (ObjCMethodDecl *setter = property->getSetterMethodDecl()) {
2158 std::string TypeStr;
2159 Context.getObjCEncodingForMethodDecl(setter,TypeStr);
2160 llvm::Constant *TypeEncoding = MakeConstantString(TypeStr);
2161 if (isSynthesized) {
2162 InstanceMethodTypes.push_back(TypeEncoding);
2163 InstanceMethodSels.push_back(setter->getSelector());
2165 Fields.push_back(MakeConstantString(setter->getSelector().getAsString()));
2166 Fields.push_back(TypeEncoding);
2168 Fields.push_back(NULLPtr);
2169 Fields.push_back(NULLPtr);
2171 Properties.push_back(llvm::ConstantStruct::get(PropertyMetadataTy, Fields));
2173 llvm::ArrayType *PropertyArrayTy =
2174 llvm::ArrayType::get(PropertyMetadataTy, Properties.size());
2175 llvm::Constant *PropertyArray = llvm::ConstantArray::get(PropertyArrayTy,
2177 llvm::Constant* PropertyListInitFields[] =
2178 {llvm::ConstantInt::get(IntTy, Properties.size()), NULLPtr, PropertyArray};
2180 llvm::Constant *PropertyListInit =
2181 llvm::ConstantStruct::getAnon(PropertyListInitFields);
2182 return new llvm::GlobalVariable(TheModule, PropertyListInit->getType(), false,
2183 llvm::GlobalValue::InternalLinkage, PropertyListInit,
2184 ".objc_property_list");
2187 void CGObjCGNU::RegisterAlias(const ObjCCompatibleAliasDecl *OAD) {
2188 // Get the class declaration for which the alias is specified.
2189 ObjCInterfaceDecl *ClassDecl =
2190 const_cast<ObjCInterfaceDecl *>(OAD->getClassInterface());
2191 ClassAliases.emplace_back(ClassDecl->getNameAsString(),
2192 OAD->getNameAsString());
2195 void CGObjCGNU::GenerateClass(const ObjCImplementationDecl *OID) {
2196 ASTContext &Context = CGM.getContext();
2198 // Get the superclass name.
2199 const ObjCInterfaceDecl * SuperClassDecl =
2200 OID->getClassInterface()->getSuperClass();
2201 std::string SuperClassName;
2202 if (SuperClassDecl) {
2203 SuperClassName = SuperClassDecl->getNameAsString();
2204 EmitClassRef(SuperClassName);
2207 // Get the class name
2208 ObjCInterfaceDecl *ClassDecl =
2209 const_cast<ObjCInterfaceDecl *>(OID->getClassInterface());
2210 std::string ClassName = ClassDecl->getNameAsString();
2212 // Emit the symbol that is used to generate linker errors if this class is
2213 // referenced in other modules but not declared.
2214 std::string classSymbolName = "__objc_class_name_" + ClassName;
2215 if (auto *symbol = TheModule.getGlobalVariable(classSymbolName)) {
2216 symbol->setInitializer(llvm::ConstantInt::get(LongTy, 0));
2218 new llvm::GlobalVariable(TheModule, LongTy, false,
2219 llvm::GlobalValue::ExternalLinkage,
2220 llvm::ConstantInt::get(LongTy, 0),
2224 // Get the size of instances.
2226 Context.getASTObjCImplementationLayout(OID).getSize().getQuantity();
2228 // Collect information about instance variables.
2229 SmallVector<llvm::Constant*, 16> IvarNames;
2230 SmallVector<llvm::Constant*, 16> IvarTypes;
2231 SmallVector<llvm::Constant*, 16> IvarOffsets;
2233 std::vector<llvm::Constant*> IvarOffsetValues;
2234 SmallVector<bool, 16> WeakIvars;
2235 SmallVector<bool, 16> StrongIvars;
2237 int superInstanceSize = !SuperClassDecl ? 0 :
2238 Context.getASTObjCInterfaceLayout(SuperClassDecl).getSize().getQuantity();
2239 // For non-fragile ivars, set the instance size to 0 - {the size of just this
2240 // class}. The runtime will then set this to the correct value on load.
2241 if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) {
2242 instanceSize = 0 - (instanceSize - superInstanceSize);
2245 for (const ObjCIvarDecl *IVD = ClassDecl->all_declared_ivar_begin(); IVD;
2246 IVD = IVD->getNextIvar()) {
2248 IvarNames.push_back(MakeConstantString(IVD->getNameAsString()));
2249 // Get the type encoding for this ivar
2250 std::string TypeStr;
2251 Context.getObjCEncodingForType(IVD->getType(), TypeStr);
2252 IvarTypes.push_back(MakeConstantString(TypeStr));
2254 uint64_t BaseOffset = ComputeIvarBaseOffset(CGM, OID, IVD);
2255 uint64_t Offset = BaseOffset;
2256 if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) {
2257 Offset = BaseOffset - superInstanceSize;
2259 llvm::Constant *OffsetValue = llvm::ConstantInt::get(IntTy, Offset);
2260 // Create the direct offset value
2261 std::string OffsetName = "__objc_ivar_offset_value_" + ClassName +"." +
2262 IVD->getNameAsString();
2263 llvm::GlobalVariable *OffsetVar = TheModule.getGlobalVariable(OffsetName);
2265 OffsetVar->setInitializer(OffsetValue);
2266 // If this is the real definition, change its linkage type so that
2267 // different modules will use this one, rather than their private
2269 OffsetVar->setLinkage(llvm::GlobalValue::ExternalLinkage);
2271 OffsetVar = new llvm::GlobalVariable(TheModule, IntTy,
2272 false, llvm::GlobalValue::ExternalLinkage,
2274 "__objc_ivar_offset_value_" + ClassName +"." +
2275 IVD->getNameAsString());
2276 IvarOffsets.push_back(OffsetValue);
2277 IvarOffsetValues.push_back(OffsetVar);
2278 Qualifiers::ObjCLifetime lt = IVD->getType().getQualifiers().getObjCLifetime();
2280 case Qualifiers::OCL_Strong:
2281 StrongIvars.push_back(true);
2282 WeakIvars.push_back(false);
2284 case Qualifiers::OCL_Weak:
2285 StrongIvars.push_back(false);
2286 WeakIvars.push_back(true);
2289 StrongIvars.push_back(false);
2290 WeakIvars.push_back(false);
2293 llvm::Constant *StrongIvarBitmap = MakeBitField(StrongIvars);
2294 llvm::Constant *WeakIvarBitmap = MakeBitField(WeakIvars);
2295 llvm::GlobalVariable *IvarOffsetArray =
2296 MakeGlobalArray(PtrToIntTy, IvarOffsetValues, CGM.getPointerAlign(),
2299 // Collect information about instance methods
2300 SmallVector<Selector, 16> InstanceMethodSels;
2301 SmallVector<llvm::Constant*, 16> InstanceMethodTypes;
2302 for (const auto *I : OID->instance_methods()) {
2303 InstanceMethodSels.push_back(I->getSelector());
2304 std::string TypeStr;
2305 Context.getObjCEncodingForMethodDecl(I,TypeStr);
2306 InstanceMethodTypes.push_back(MakeConstantString(TypeStr));
2309 llvm::Constant *Properties = GeneratePropertyList(OID, InstanceMethodSels,
2310 InstanceMethodTypes);
2312 // Collect information about class methods
2313 SmallVector<Selector, 16> ClassMethodSels;
2314 SmallVector<llvm::Constant*, 16> ClassMethodTypes;
2315 for (const auto *I : OID->class_methods()) {
2316 ClassMethodSels.push_back(I->getSelector());
2317 std::string TypeStr;
2318 Context.getObjCEncodingForMethodDecl(I,TypeStr);
2319 ClassMethodTypes.push_back(MakeConstantString(TypeStr));
2321 // Collect the names of referenced protocols
2322 SmallVector<std::string, 16> Protocols;
2323 for (const auto *I : ClassDecl->protocols())
2324 Protocols.push_back(I->getNameAsString());
2326 // Get the superclass pointer.
2327 llvm::Constant *SuperClass;
2328 if (!SuperClassName.empty()) {
2329 SuperClass = MakeConstantString(SuperClassName, ".super_class_name");
2331 SuperClass = llvm::ConstantPointerNull::get(PtrToInt8Ty);
2333 // Empty vector used to construct empty method lists
2334 SmallVector<llvm::Constant*, 1> empty;
2335 // Generate the method and instance variable lists
2336 llvm::Constant *MethodList = GenerateMethodList(ClassName, "",
2337 InstanceMethodSels, InstanceMethodTypes, false);
2338 llvm::Constant *ClassMethodList = GenerateMethodList(ClassName, "",
2339 ClassMethodSels, ClassMethodTypes, true);
2340 llvm::Constant *IvarList = GenerateIvarList(IvarNames, IvarTypes,
2342 // Irrespective of whether we are compiling for a fragile or non-fragile ABI,
2343 // we emit a symbol containing the offset for each ivar in the class. This
2344 // allows code compiled for the non-Fragile ABI to inherit from code compiled
2345 // for the legacy ABI, without causing problems. The converse is also
2346 // possible, but causes all ivar accesses to be fragile.
2348 // Offset pointer for getting at the correct field in the ivar list when
2349 // setting up the alias. These are: The base address for the global, the
2350 // ivar array (second field), the ivar in this list (set for each ivar), and
2351 // the offset (third field in ivar structure)
2352 llvm::Type *IndexTy = Int32Ty;
2353 llvm::Constant *offsetPointerIndexes[] = {Zeros[0],
2354 llvm::ConstantInt::get(IndexTy, 1), nullptr,
2355 llvm::ConstantInt::get(IndexTy, 2) };
2357 unsigned ivarIndex = 0;
2358 for (const ObjCIvarDecl *IVD = ClassDecl->all_declared_ivar_begin(); IVD;
2359 IVD = IVD->getNextIvar()) {
2360 const std::string Name = "__objc_ivar_offset_" + ClassName + '.'
2361 + IVD->getNameAsString();
2362 offsetPointerIndexes[2] = llvm::ConstantInt::get(IndexTy, ivarIndex);
2363 // Get the correct ivar field
2364 llvm::Constant *offsetValue = llvm::ConstantExpr::getGetElementPtr(
2365 cast<llvm::GlobalVariable>(IvarList)->getValueType(), IvarList,
2366 offsetPointerIndexes);
2367 // Get the existing variable, if one exists.
2368 llvm::GlobalVariable *offset = TheModule.getNamedGlobal(Name);
2370 offset->setInitializer(offsetValue);
2371 // If this is the real definition, change its linkage type so that
2372 // different modules will use this one, rather than their private
2374 offset->setLinkage(llvm::GlobalValue::ExternalLinkage);
2376 // Add a new alias if there isn't one already.
2377 offset = new llvm::GlobalVariable(TheModule, offsetValue->getType(),
2378 false, llvm::GlobalValue::ExternalLinkage, offsetValue, Name);
2379 (void) offset; // Silence dead store warning.
2383 llvm::Constant *ZeroPtr = llvm::ConstantInt::get(IntPtrTy, 0);
2385 //Generate metaclass for class methods
2386 llvm::Constant *MetaClassStruct = GenerateClassStructure(
2387 NULLPtr, NULLPtr, 0x12L, ClassName.c_str(), nullptr, Zeros[0],
2388 GenerateIvarList(empty, empty, empty), ClassMethodList, NULLPtr, NULLPtr,
2389 NULLPtr, ZeroPtr, ZeroPtr, true);
2390 if (CGM.getTriple().isOSBinFormatCOFF()) {
2391 auto Storage = llvm::GlobalValue::DefaultStorageClass;
2392 if (OID->getClassInterface()->hasAttr<DLLImportAttr>())
2393 Storage = llvm::GlobalValue::DLLImportStorageClass;
2394 else if (OID->getClassInterface()->hasAttr<DLLExportAttr>())
2395 Storage = llvm::GlobalValue::DLLExportStorageClass;
2396 cast<llvm::GlobalValue>(MetaClassStruct)->setDLLStorageClass(Storage);
2399 // Generate the class structure
2400 llvm::Constant *ClassStruct = GenerateClassStructure(
2401 MetaClassStruct, SuperClass, 0x11L, ClassName.c_str(), nullptr,
2402 llvm::ConstantInt::get(LongTy, instanceSize), IvarList, MethodList,
2403 GenerateProtocolList(Protocols), IvarOffsetArray, Properties,
2404 StrongIvarBitmap, WeakIvarBitmap);
2405 if (CGM.getTriple().isOSBinFormatCOFF()) {
2406 auto Storage = llvm::GlobalValue::DefaultStorageClass;
2407 if (OID->getClassInterface()->hasAttr<DLLImportAttr>())
2408 Storage = llvm::GlobalValue::DLLImportStorageClass;
2409 else if (OID->getClassInterface()->hasAttr<DLLExportAttr>())
2410 Storage = llvm::GlobalValue::DLLExportStorageClass;
2411 cast<llvm::GlobalValue>(ClassStruct)->setDLLStorageClass(Storage);
2414 // Resolve the class aliases, if they exist.
2415 if (ClassPtrAlias) {
2416 ClassPtrAlias->replaceAllUsesWith(
2417 llvm::ConstantExpr::getBitCast(ClassStruct, IdTy));
2418 ClassPtrAlias->eraseFromParent();
2419 ClassPtrAlias = nullptr;
2421 if (MetaClassPtrAlias) {
2422 MetaClassPtrAlias->replaceAllUsesWith(
2423 llvm::ConstantExpr::getBitCast(MetaClassStruct, IdTy));
2424 MetaClassPtrAlias->eraseFromParent();
2425 MetaClassPtrAlias = nullptr;
2428 // Add class structure to list to be added to the symtab later
2429 ClassStruct = llvm::ConstantExpr::getBitCast(ClassStruct, PtrToInt8Ty);
2430 Classes.push_back(ClassStruct);
2433 llvm::Function *CGObjCGNU::ModuleInitFunction() {
2434 // Only emit an ObjC load function if no Objective-C stuff has been called
2435 if (Classes.empty() && Categories.empty() && ConstantStrings.empty() &&
2436 ExistingProtocols.empty() && SelectorTable.empty())
2439 // Add all referenced protocols to a category.
2440 GenerateProtocolHolderCategory();
2442 llvm::StructType *SelStructTy = dyn_cast<llvm::StructType>(
2443 SelectorTy->getElementType());
2444 llvm::Type *SelStructPtrTy = SelectorTy;
2446 SelStructTy = llvm::StructType::get(PtrToInt8Ty, PtrToInt8Ty, nullptr);
2447 SelStructPtrTy = llvm::PointerType::getUnqual(SelStructTy);
2450 std::vector<llvm::Constant*> Elements;
2451 llvm::Constant *Statics = NULLPtr;
2452 // Generate statics list:
2453 if (!ConstantStrings.empty()) {
2454 llvm::ArrayType *StaticsArrayTy = llvm::ArrayType::get(PtrToInt8Ty,
2455 ConstantStrings.size() + 1);
2456 ConstantStrings.push_back(NULLPtr);
2458 StringRef StringClass = CGM.getLangOpts().ObjCConstantStringClass;
2460 if (StringClass.empty()) StringClass = "NXConstantString";
2462 Elements.push_back(MakeConstantString(StringClass,
2463 ".objc_static_class_name"));
2464 Elements.push_back(llvm::ConstantArray::get(StaticsArrayTy,
2466 llvm::StructType *StaticsListTy =
2467 llvm::StructType::get(PtrToInt8Ty, StaticsArrayTy, nullptr);
2468 llvm::Type *StaticsListPtrTy =
2469 llvm::PointerType::getUnqual(StaticsListTy);
2470 Statics = MakeGlobal(StaticsListTy, Elements, CGM.getPointerAlign(),
2472 llvm::ArrayType *StaticsListArrayTy =
2473 llvm::ArrayType::get(StaticsListPtrTy, 2);
2475 Elements.push_back(Statics);
2476 Elements.push_back(llvm::Constant::getNullValue(StaticsListPtrTy));
2477 Statics = MakeGlobal(StaticsListArrayTy, Elements,
2478 CGM.getPointerAlign(), ".objc_statics_ptr");
2479 Statics = llvm::ConstantExpr::getBitCast(Statics, PtrTy);
2481 // Array of classes, categories, and constant objects
2482 llvm::ArrayType *ClassListTy = llvm::ArrayType::get(PtrToInt8Ty,
2483 Classes.size() + Categories.size() + 2);
2484 llvm::StructType *SymTabTy = llvm::StructType::get(LongTy, SelStructPtrTy,
2485 llvm::Type::getInt16Ty(VMContext),
2486 llvm::Type::getInt16Ty(VMContext),
2487 ClassListTy, nullptr);
2490 // Pointer to an array of selectors used in this module.
2491 std::vector<llvm::Constant*> Selectors;
2492 std::vector<llvm::GlobalAlias*> SelectorAliases;
2493 for (SelectorMap::iterator iter = SelectorTable.begin(),
2494 iterEnd = SelectorTable.end(); iter != iterEnd ; ++iter) {
2496 std::string SelNameStr = iter->first.getAsString();
2497 llvm::Constant *SelName = ExportUniqueString(SelNameStr, ".objc_sel_name");
2499 SmallVectorImpl<TypedSelector> &Types = iter->second;
2500 for (SmallVectorImpl<TypedSelector>::iterator i = Types.begin(),
2501 e = Types.end() ; i!=e ; i++) {
2503 llvm::Constant *SelectorTypeEncoding = NULLPtr;
2504 if (!i->first.empty())
2505 SelectorTypeEncoding = MakeConstantString(i->first, ".objc_sel_types");
2507 Elements.push_back(SelName);
2508 Elements.push_back(SelectorTypeEncoding);
2509 Selectors.push_back(llvm::ConstantStruct::get(SelStructTy, Elements));
2512 // Store the selector alias for later replacement
2513 SelectorAliases.push_back(i->second);
2516 unsigned SelectorCount = Selectors.size();
2517 // NULL-terminate the selector list. This should not actually be required,
2518 // because the selector list has a length field. Unfortunately, the GCC
2519 // runtime decides to ignore the length field and expects a NULL terminator,
2520 // and GCC cooperates with this by always setting the length to 0.
2521 Elements.push_back(NULLPtr);
2522 Elements.push_back(NULLPtr);
2523 Selectors.push_back(llvm::ConstantStruct::get(SelStructTy, Elements));
2526 // Number of static selectors
2527 Elements.push_back(llvm::ConstantInt::get(LongTy, SelectorCount));
2528 llvm::GlobalVariable *SelectorList =
2529 MakeGlobalArray(SelStructTy, Selectors, CGM.getPointerAlign(),
2530 ".objc_selector_list");
2531 Elements.push_back(llvm::ConstantExpr::getBitCast(SelectorList,
2534 // Now that all of the static selectors exist, create pointers to them.
2535 for (unsigned int i=0 ; i<SelectorCount ; i++) {
2537 llvm::Constant *Idxs[] = {Zeros[0],
2538 llvm::ConstantInt::get(Int32Ty, i), Zeros[0]};
2539 // FIXME: We're generating redundant loads and stores here!
2540 llvm::Constant *SelPtr = llvm::ConstantExpr::getGetElementPtr(
2541 SelectorList->getValueType(), SelectorList, makeArrayRef(Idxs, 2));
2542 // If selectors are defined as an opaque type, cast the pointer to this
2544 SelPtr = llvm::ConstantExpr::getBitCast(SelPtr, SelectorTy);
2545 SelectorAliases[i]->replaceAllUsesWith(SelPtr);
2546 SelectorAliases[i]->eraseFromParent();
2549 // Number of classes defined.
2550 Elements.push_back(llvm::ConstantInt::get(llvm::Type::getInt16Ty(VMContext),
2552 // Number of categories defined
2553 Elements.push_back(llvm::ConstantInt::get(llvm::Type::getInt16Ty(VMContext),
2554 Categories.size()));
2555 // Create an array of classes, then categories, then static object instances
2556 Classes.insert(Classes.end(), Categories.begin(), Categories.end());
2557 // NULL-terminated list of static object instances (mainly constant strings)
2558 Classes.push_back(Statics);
2559 Classes.push_back(NULLPtr);
2560 llvm::Constant *ClassList = llvm::ConstantArray::get(ClassListTy, Classes);
2561 Elements.push_back(ClassList);
2562 // Construct the symbol table
2563 llvm::Constant *SymTab =
2564 MakeGlobal(SymTabTy, Elements, CGM.getPointerAlign());
2566 // The symbol table is contained in a module which has some version-checking
2568 llvm::StructType * ModuleTy = llvm::StructType::get(LongTy, LongTy,
2569 PtrToInt8Ty, llvm::PointerType::getUnqual(SymTabTy),
2570 (RuntimeVersion >= 10) ? IntTy : nullptr, nullptr);
2572 // Runtime version, used for ABI compatibility checking.
2573 Elements.push_back(llvm::ConstantInt::get(LongTy, RuntimeVersion));
2575 llvm::DataLayout td(&TheModule);
2577 llvm::ConstantInt::get(LongTy,
2578 td.getTypeSizeInBits(ModuleTy) /
2579 CGM.getContext().getCharWidth()));
2581 // The path to the source file where this module was declared
2582 SourceManager &SM = CGM.getContext().getSourceManager();
2583 const FileEntry *mainFile = SM.getFileEntryForID(SM.getMainFileID());
2585 std::string(mainFile->getDir()->getName()) + '/' + mainFile->getName();
2586 Elements.push_back(MakeConstantString(path, ".objc_source_file_name"));
2587 Elements.push_back(SymTab);
2589 if (RuntimeVersion >= 10)
2590 switch (CGM.getLangOpts().getGC()) {
2591 case LangOptions::GCOnly:
2592 Elements.push_back(llvm::ConstantInt::get(IntTy, 2));
2594 case LangOptions::NonGC:
2595 if (CGM.getLangOpts().ObjCAutoRefCount)
2596 Elements.push_back(llvm::ConstantInt::get(IntTy, 1));
2598 Elements.push_back(llvm::ConstantInt::get(IntTy, 0));
2600 case LangOptions::HybridGC:
2601 Elements.push_back(llvm::ConstantInt::get(IntTy, 1));
2605 llvm::Value *Module = MakeGlobal(ModuleTy, Elements, CGM.getPointerAlign());
2607 // Create the load function calling the runtime entry point with the module
2609 llvm::Function * LoadFunction = llvm::Function::Create(
2610 llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), false),
2611 llvm::GlobalValue::InternalLinkage, ".objc_load_function",
2613 llvm::BasicBlock *EntryBB =
2614 llvm::BasicBlock::Create(VMContext, "entry", LoadFunction);
2615 CGBuilderTy Builder(CGM, VMContext);
2616 Builder.SetInsertPoint(EntryBB);
2618 llvm::FunctionType *FT =
2619 llvm::FunctionType::get(Builder.getVoidTy(),
2620 llvm::PointerType::getUnqual(ModuleTy), true);
2621 llvm::Value *Register = CGM.CreateRuntimeFunction(FT, "__objc_exec_class");
2622 Builder.CreateCall(Register, Module);
2624 if (!ClassAliases.empty()) {
2625 llvm::Type *ArgTypes[2] = {PtrTy, PtrToInt8Ty};
2626 llvm::FunctionType *RegisterAliasTy =
2627 llvm::FunctionType::get(Builder.getVoidTy(),
2629 llvm::Function *RegisterAlias = llvm::Function::Create(
2631 llvm::GlobalValue::ExternalWeakLinkage, "class_registerAlias_np",
2633 llvm::BasicBlock *AliasBB =
2634 llvm::BasicBlock::Create(VMContext, "alias", LoadFunction);
2635 llvm::BasicBlock *NoAliasBB =
2636 llvm::BasicBlock::Create(VMContext, "no_alias", LoadFunction);
2638 // Branch based on whether the runtime provided class_registerAlias_np()
2639 llvm::Value *HasRegisterAlias = Builder.CreateICmpNE(RegisterAlias,
2640 llvm::Constant::getNullValue(RegisterAlias->getType()));
2641 Builder.CreateCondBr(HasRegisterAlias, AliasBB, NoAliasBB);
2643 // The true branch (has alias registration function):
2644 Builder.SetInsertPoint(AliasBB);
2645 // Emit alias registration calls:
2646 for (std::vector<ClassAliasPair>::iterator iter = ClassAliases.begin();
2647 iter != ClassAliases.end(); ++iter) {
2648 llvm::Constant *TheClass =
2649 TheModule.getGlobalVariable(("_OBJC_CLASS_" + iter->first).c_str(),
2652 TheClass = llvm::ConstantExpr::getBitCast(TheClass, PtrTy);
2653 Builder.CreateCall(RegisterAlias,
2654 {TheClass, MakeConstantString(iter->second)});
2658 Builder.CreateBr(NoAliasBB);
2660 // Missing alias registration function, just return from the function:
2661 Builder.SetInsertPoint(NoAliasBB);
2663 Builder.CreateRetVoid();
2665 return LoadFunction;
2668 llvm::Function *CGObjCGNU::GenerateMethod(const ObjCMethodDecl *OMD,
2669 const ObjCContainerDecl *CD) {
2670 const ObjCCategoryImplDecl *OCD =
2671 dyn_cast<ObjCCategoryImplDecl>(OMD->getDeclContext());
2672 StringRef CategoryName = OCD ? OCD->getName() : "";
2673 StringRef ClassName = CD->getName();
2674 Selector MethodName = OMD->getSelector();
2675 bool isClassMethod = !OMD->isInstanceMethod();
2677 CodeGenTypes &Types = CGM.getTypes();
2678 llvm::FunctionType *MethodTy =
2679 Types.GetFunctionType(Types.arrangeObjCMethodDeclaration(OMD));
2680 std::string FunctionName = SymbolNameForMethod(ClassName, CategoryName,
2681 MethodName, isClassMethod);
2683 llvm::Function *Method
2684 = llvm::Function::Create(MethodTy,
2685 llvm::GlobalValue::InternalLinkage,
2691 llvm::Constant *CGObjCGNU::GetPropertyGetFunction() {
2692 return GetPropertyFn;
2695 llvm::Constant *CGObjCGNU::GetPropertySetFunction() {
2696 return SetPropertyFn;
2699 llvm::Constant *CGObjCGNU::GetOptimizedPropertySetFunction(bool atomic,
2704 llvm::Constant *CGObjCGNU::GetGetStructFunction() {
2705 return GetStructPropertyFn;
2708 llvm::Constant *CGObjCGNU::GetSetStructFunction() {
2709 return SetStructPropertyFn;
2712 llvm::Constant *CGObjCGNU::GetCppAtomicObjectGetFunction() {
2716 llvm::Constant *CGObjCGNU::GetCppAtomicObjectSetFunction() {
2720 llvm::Constant *CGObjCGNU::EnumerationMutationFunction() {
2721 return EnumerationMutationFn;
2724 void CGObjCGNU::EmitSynchronizedStmt(CodeGenFunction &CGF,
2725 const ObjCAtSynchronizedStmt &S) {
2726 EmitAtSynchronizedStmt(CGF, S, SyncEnterFn, SyncExitFn);
2730 void CGObjCGNU::EmitTryStmt(CodeGenFunction &CGF,
2731 const ObjCAtTryStmt &S) {
2732 // Unlike the Apple non-fragile runtimes, which also uses
2733 // unwind-based zero cost exceptions, the GNU Objective C runtime's
2734 // EH support isn't a veneer over C++ EH. Instead, exception
2735 // objects are created by objc_exception_throw and destroyed by
2736 // the personality function; this avoids the need for bracketing
2737 // catch handlers with calls to __blah_begin_catch/__blah_end_catch
2738 // (or even _Unwind_DeleteException), but probably doesn't
2739 // interoperate very well with foreign exceptions.
2741 // In Objective-C++ mode, we actually emit something equivalent to the C++
2742 // exception handler.
2743 EmitTryCatchStmt(CGF, S, EnterCatchFn, ExitCatchFn, ExceptionReThrowFn);
2746 void CGObjCGNU::EmitThrowStmt(CodeGenFunction &CGF,
2747 const ObjCAtThrowStmt &S,
2748 bool ClearInsertionPoint) {
2749 llvm::Value *ExceptionAsObject;
2751 if (const Expr *ThrowExpr = S.getThrowExpr()) {
2752 llvm::Value *Exception = CGF.EmitObjCThrowOperand(ThrowExpr);
2753 ExceptionAsObject = Exception;
2755 assert((!CGF.ObjCEHValueStack.empty() && CGF.ObjCEHValueStack.back()) &&
2756 "Unexpected rethrow outside @catch block.");
2757 ExceptionAsObject = CGF.ObjCEHValueStack.back();
2759 ExceptionAsObject = CGF.Builder.CreateBitCast(ExceptionAsObject, IdTy);
2760 llvm::CallSite Throw =
2761 CGF.EmitRuntimeCallOrInvoke(ExceptionThrowFn, ExceptionAsObject);
2762 Throw.setDoesNotReturn();
2763 CGF.Builder.CreateUnreachable();
2764 if (ClearInsertionPoint)
2765 CGF.Builder.ClearInsertionPoint();
2768 llvm::Value * CGObjCGNU::EmitObjCWeakRead(CodeGenFunction &CGF,
2769 Address AddrWeakObj) {
2770 CGBuilderTy &B = CGF.Builder;
2771 AddrWeakObj = EnforceType(B, AddrWeakObj, PtrToIdTy);
2772 return B.CreateCall(WeakReadFn.getType(), WeakReadFn,
2773 AddrWeakObj.getPointer());
2776 void CGObjCGNU::EmitObjCWeakAssign(CodeGenFunction &CGF,
2777 llvm::Value *src, Address dst) {
2778 CGBuilderTy &B = CGF.Builder;
2779 src = EnforceType(B, src, IdTy);
2780 dst = EnforceType(B, dst, PtrToIdTy);
2781 B.CreateCall(WeakAssignFn.getType(), WeakAssignFn,
2782 {src, dst.getPointer()});
2785 void CGObjCGNU::EmitObjCGlobalAssign(CodeGenFunction &CGF,
2786 llvm::Value *src, Address dst,
2788 CGBuilderTy &B = CGF.Builder;
2789 src = EnforceType(B, src, IdTy);
2790 dst = EnforceType(B, dst, PtrToIdTy);
2791 // FIXME. Add threadloca assign API
2792 assert(!threadlocal && "EmitObjCGlobalAssign - Threal Local API NYI");
2793 B.CreateCall(GlobalAssignFn.getType(), GlobalAssignFn,
2794 {src, dst.getPointer()});
2797 void CGObjCGNU::EmitObjCIvarAssign(CodeGenFunction &CGF,
2798 llvm::Value *src, Address dst,
2799 llvm::Value *ivarOffset) {
2800 CGBuilderTy &B = CGF.Builder;
2801 src = EnforceType(B, src, IdTy);
2802 dst = EnforceType(B, dst, IdTy);
2803 B.CreateCall(IvarAssignFn.getType(), IvarAssignFn,
2804 {src, dst.getPointer(), ivarOffset});
2807 void CGObjCGNU::EmitObjCStrongCastAssign(CodeGenFunction &CGF,
2808 llvm::Value *src, Address dst) {
2809 CGBuilderTy &B = CGF.Builder;
2810 src = EnforceType(B, src, IdTy);
2811 dst = EnforceType(B, dst, PtrToIdTy);
2812 B.CreateCall(StrongCastAssignFn.getType(), StrongCastAssignFn,
2813 {src, dst.getPointer()});
2816 void CGObjCGNU::EmitGCMemmoveCollectable(CodeGenFunction &CGF,
2819 llvm::Value *Size) {
2820 CGBuilderTy &B = CGF.Builder;
2821 DestPtr = EnforceType(B, DestPtr, PtrTy);
2822 SrcPtr = EnforceType(B, SrcPtr, PtrTy);
2824 B.CreateCall(MemMoveFn.getType(), MemMoveFn,
2825 {DestPtr.getPointer(), SrcPtr.getPointer(), Size});
2828 llvm::GlobalVariable *CGObjCGNU::ObjCIvarOffsetVariable(
2829 const ObjCInterfaceDecl *ID,
2830 const ObjCIvarDecl *Ivar) {
2831 const std::string Name = "__objc_ivar_offset_" + ID->getNameAsString()
2832 + '.' + Ivar->getNameAsString();
2833 // Emit the variable and initialize it with what we think the correct value
2834 // is. This allows code compiled with non-fragile ivars to work correctly
2835 // when linked against code which isn't (most of the time).
2836 llvm::GlobalVariable *IvarOffsetPointer = TheModule.getNamedGlobal(Name);
2837 if (!IvarOffsetPointer) {
2838 // This will cause a run-time crash if we accidentally use it. A value of
2839 // 0 would seem more sensible, but will silently overwrite the isa pointer
2840 // causing a great deal of confusion.
2841 uint64_t Offset = -1;
2842 // We can't call ComputeIvarBaseOffset() here if we have the
2843 // implementation, because it will create an invalid ASTRecordLayout object
2844 // that we are then stuck with forever, so we only initialize the ivar
2845 // offset variable with a guess if we only have the interface. The
2846 // initializer will be reset later anyway, when we are generating the class
2848 if (!CGM.getContext().getObjCImplementation(
2849 const_cast<ObjCInterfaceDecl *>(ID)))
2850 Offset = ComputeIvarBaseOffset(CGM, ID, Ivar);
2852 llvm::ConstantInt *OffsetGuess = llvm::ConstantInt::get(Int32Ty, Offset,
2854 // Don't emit the guess in non-PIC code because the linker will not be able
2855 // to replace it with the real version for a library. In non-PIC code you
2856 // must compile with the fragile ABI if you want to use ivars from a
2857 // GCC-compiled class.
2858 if (CGM.getLangOpts().PICLevel) {
2859 llvm::GlobalVariable *IvarOffsetGV = new llvm::GlobalVariable(TheModule,
2861 llvm::GlobalValue::PrivateLinkage, OffsetGuess, Name+".guess");
2862 IvarOffsetPointer = new llvm::GlobalVariable(TheModule,
2863 IvarOffsetGV->getType(), false, llvm::GlobalValue::LinkOnceAnyLinkage,
2864 IvarOffsetGV, Name);
2866 IvarOffsetPointer = new llvm::GlobalVariable(TheModule,
2867 llvm::Type::getInt32PtrTy(VMContext), false,
2868 llvm::GlobalValue::ExternalLinkage, nullptr, Name);
2871 return IvarOffsetPointer;
2874 LValue CGObjCGNU::EmitObjCValueForIvar(CodeGenFunction &CGF,
2876 llvm::Value *BaseValue,
2877 const ObjCIvarDecl *Ivar,
2878 unsigned CVRQualifiers) {
2879 const ObjCInterfaceDecl *ID =
2880 ObjectTy->getAs<ObjCObjectType>()->getInterface();
2881 return EmitValueForIvarAtOffset(CGF, ID, BaseValue, Ivar, CVRQualifiers,
2882 EmitIvarOffset(CGF, ID, Ivar));
2885 static const ObjCInterfaceDecl *FindIvarInterface(ASTContext &Context,
2886 const ObjCInterfaceDecl *OID,
2887 const ObjCIvarDecl *OIVD) {
2888 for (const ObjCIvarDecl *next = OID->all_declared_ivar_begin(); next;
2889 next = next->getNextIvar()) {
2894 // Otherwise check in the super class.
2895 if (const ObjCInterfaceDecl *Super = OID->getSuperClass())
2896 return FindIvarInterface(Context, Super, OIVD);
2901 llvm::Value *CGObjCGNU::EmitIvarOffset(CodeGenFunction &CGF,
2902 const ObjCInterfaceDecl *Interface,
2903 const ObjCIvarDecl *Ivar) {
2904 if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) {
2905 Interface = FindIvarInterface(CGM.getContext(), Interface, Ivar);
2907 // The MSVC linker cannot have a single global defined as LinkOnceAnyLinkage
2908 // and ExternalLinkage, so create a reference to the ivar global and rely on
2909 // the definition being created as part of GenerateClass.
2910 if (RuntimeVersion < 10 ||
2911 CGF.CGM.getTarget().getTriple().isKnownWindowsMSVCEnvironment())
2912 return CGF.Builder.CreateZExtOrBitCast(
2913 CGF.Builder.CreateDefaultAlignedLoad(CGF.Builder.CreateAlignedLoad(
2914 ObjCIvarOffsetVariable(Interface, Ivar),
2915 CGF.getPointerAlign(), "ivar")),
2917 std::string name = "__objc_ivar_offset_value_" +
2918 Interface->getNameAsString() +"." + Ivar->getNameAsString();
2919 CharUnits Align = CGM.getIntAlign();
2920 llvm::Value *Offset = TheModule.getGlobalVariable(name);
2922 auto GV = new llvm::GlobalVariable(TheModule, IntTy,
2923 false, llvm::GlobalValue::LinkOnceAnyLinkage,
2924 llvm::Constant::getNullValue(IntTy), name);
2925 GV->setAlignment(Align.getQuantity());
2928 Offset = CGF.Builder.CreateAlignedLoad(Offset, Align);
2929 if (Offset->getType() != PtrDiffTy)
2930 Offset = CGF.Builder.CreateZExtOrBitCast(Offset, PtrDiffTy);
2933 uint64_t Offset = ComputeIvarBaseOffset(CGF.CGM, Interface, Ivar);
2934 return llvm::ConstantInt::get(PtrDiffTy, Offset, /*isSigned*/true);
2938 clang::CodeGen::CreateGNUObjCRuntime(CodeGenModule &CGM) {
2939 switch (CGM.getLangOpts().ObjCRuntime.getKind()) {
2940 case ObjCRuntime::GNUstep:
2941 return new CGObjCGNUstep(CGM);
2943 case ObjCRuntime::GCC:
2944 return new CGObjCGCC(CGM);
2946 case ObjCRuntime::ObjFW:
2947 return new CGObjCObjFW(CGM);
2949 case ObjCRuntime::FragileMacOSX:
2950 case ObjCRuntime::MacOSX:
2951 case ObjCRuntime::iOS:
2952 case ObjCRuntime::WatchOS:
2953 llvm_unreachable("these runtimes are not GNU runtimes");
2955 llvm_unreachable("bad runtime");