1 //===------- CGObjCMac.cpp - Interface to Apple Objective-C Runtime -------===//
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 Apple runtime.
12 //===----------------------------------------------------------------------===//
15 #include "CGCleanup.h"
16 #include "CGObjCRuntime.h"
17 #include "CGRecordLayout.h"
18 #include "CodeGenFunction.h"
19 #include "CodeGenModule.h"
20 #include "clang/CodeGen/ConstantInitBuilder.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/LangOptions.h"
27 #include "clang/CodeGen/CGFunctionInfo.h"
28 #include "clang/Frontend/CodeGenOptions.h"
29 #include "llvm/ADT/CachedHashString.h"
30 #include "llvm/ADT/DenseSet.h"
31 #include "llvm/ADT/SetVector.h"
32 #include "llvm/ADT/SmallPtrSet.h"
33 #include "llvm/ADT/SmallString.h"
34 #include "llvm/IR/CallSite.h"
35 #include "llvm/IR/DataLayout.h"
36 #include "llvm/IR/InlineAsm.h"
37 #include "llvm/IR/IntrinsicInst.h"
38 #include "llvm/IR/LLVMContext.h"
39 #include "llvm/IR/Module.h"
40 #include "llvm/Support/raw_ostream.h"
43 using namespace clang;
44 using namespace CodeGen;
48 // FIXME: We should find a nicer way to make the labels for metadata, string
49 // concatenation is lame.
51 class ObjCCommonTypesHelper {
53 llvm::LLVMContext &VMContext;
56 // The types of these functions don't really matter because we
57 // should always bitcast before calling them.
59 /// id objc_msgSend (id, SEL, ...)
61 /// The default messenger, used for sends whose ABI is unchanged from
62 /// the all-integer/pointer case.
63 llvm::Constant *getMessageSendFn() const {
64 // Add the non-lazy-bind attribute, since objc_msgSend is likely to
66 llvm::Type *params[] = { ObjectPtrTy, SelectorPtrTy };
67 return CGM.CreateRuntimeFunction(
68 llvm::FunctionType::get(ObjectPtrTy, params, true), "objc_msgSend",
69 llvm::AttributeList::get(CGM.getLLVMContext(),
70 llvm::AttributeList::FunctionIndex,
71 llvm::Attribute::NonLazyBind));
74 /// void objc_msgSend_stret (id, SEL, ...)
76 /// The messenger used when the return value is an aggregate returned
77 /// by indirect reference in the first argument, and therefore the
78 /// self and selector parameters are shifted over by one.
79 llvm::Constant *getMessageSendStretFn() const {
80 llvm::Type *params[] = { ObjectPtrTy, SelectorPtrTy };
81 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(CGM.VoidTy,
83 "objc_msgSend_stret");
87 /// [double | long double] objc_msgSend_fpret(id self, SEL op, ...)
89 /// The messenger used when the return value is returned on the x87
90 /// floating-point stack; without a special entrypoint, the nil case
91 /// would be unbalanced.
92 llvm::Constant *getMessageSendFpretFn() const {
93 llvm::Type *params[] = { ObjectPtrTy, SelectorPtrTy };
94 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(CGM.DoubleTy,
96 "objc_msgSend_fpret");
100 /// _Complex long double objc_msgSend_fp2ret(id self, SEL op, ...)
102 /// The messenger used when the return value is returned in two values on the
103 /// x87 floating point stack; without a special entrypoint, the nil case
104 /// would be unbalanced. Only used on 64-bit X86.
105 llvm::Constant *getMessageSendFp2retFn() const {
106 llvm::Type *params[] = { ObjectPtrTy, SelectorPtrTy };
107 llvm::Type *longDoubleType = llvm::Type::getX86_FP80Ty(VMContext);
108 llvm::Type *resultType =
109 llvm::StructType::get(longDoubleType, longDoubleType);
111 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(resultType,
113 "objc_msgSend_fp2ret");
116 /// id objc_msgSendSuper(struct objc_super *super, SEL op, ...)
118 /// The messenger used for super calls, which have different dispatch
119 /// semantics. The class passed is the superclass of the current
121 llvm::Constant *getMessageSendSuperFn() const {
122 llvm::Type *params[] = { SuperPtrTy, SelectorPtrTy };
123 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy,
125 "objc_msgSendSuper");
128 /// id objc_msgSendSuper2(struct objc_super *super, SEL op, ...)
130 /// A slightly different messenger used for super calls. The class
131 /// passed is the current class.
132 llvm::Constant *getMessageSendSuperFn2() const {
133 llvm::Type *params[] = { SuperPtrTy, SelectorPtrTy };
134 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy,
136 "objc_msgSendSuper2");
139 /// void objc_msgSendSuper_stret(void *stretAddr, struct objc_super *super,
142 /// The messenger used for super calls which return an aggregate indirectly.
143 llvm::Constant *getMessageSendSuperStretFn() const {
144 llvm::Type *params[] = { Int8PtrTy, SuperPtrTy, SelectorPtrTy };
145 return CGM.CreateRuntimeFunction(
146 llvm::FunctionType::get(CGM.VoidTy, params, true),
147 "objc_msgSendSuper_stret");
150 /// void objc_msgSendSuper2_stret(void * stretAddr, struct objc_super *super,
153 /// objc_msgSendSuper_stret with the super2 semantics.
154 llvm::Constant *getMessageSendSuperStretFn2() const {
155 llvm::Type *params[] = { Int8PtrTy, SuperPtrTy, SelectorPtrTy };
156 return CGM.CreateRuntimeFunction(
157 llvm::FunctionType::get(CGM.VoidTy, params, true),
158 "objc_msgSendSuper2_stret");
161 llvm::Constant *getMessageSendSuperFpretFn() const {
162 // There is no objc_msgSendSuper_fpret? How can that work?
163 return getMessageSendSuperFn();
166 llvm::Constant *getMessageSendSuperFpretFn2() const {
167 // There is no objc_msgSendSuper_fpret? How can that work?
168 return getMessageSendSuperFn2();
172 CodeGen::CodeGenModule &CGM;
175 llvm::IntegerType *ShortTy, *IntTy, *LongTy;
176 llvm::PointerType *Int8PtrTy, *Int8PtrPtrTy;
177 llvm::Type *IvarOffsetVarTy;
179 /// ObjectPtrTy - LLVM type for object handles (typeof(id))
180 llvm::PointerType *ObjectPtrTy;
182 /// PtrObjectPtrTy - LLVM type for id *
183 llvm::PointerType *PtrObjectPtrTy;
185 /// SelectorPtrTy - LLVM type for selector handles (typeof(SEL))
186 llvm::PointerType *SelectorPtrTy;
189 /// ProtocolPtrTy - LLVM type for external protocol handles
190 /// (typeof(Protocol))
191 llvm::Type *ExternalProtocolPtrTy;
194 llvm::Type *getExternalProtocolPtrTy() {
195 if (!ExternalProtocolPtrTy) {
196 // FIXME: It would be nice to unify this with the opaque type, so that the
197 // IR comes out a bit cleaner.
198 CodeGen::CodeGenTypes &Types = CGM.getTypes();
199 ASTContext &Ctx = CGM.getContext();
200 llvm::Type *T = Types.ConvertType(Ctx.getObjCProtoType());
201 ExternalProtocolPtrTy = llvm::PointerType::getUnqual(T);
204 return ExternalProtocolPtrTy;
207 // SuperCTy - clang type for struct objc_super.
209 // SuperPtrCTy - clang type for struct objc_super *.
210 QualType SuperPtrCTy;
212 /// SuperTy - LLVM type for struct objc_super.
213 llvm::StructType *SuperTy;
214 /// SuperPtrTy - LLVM type for struct objc_super *.
215 llvm::PointerType *SuperPtrTy;
217 /// PropertyTy - LLVM type for struct objc_property (struct _prop_t
218 /// in GCC parlance).
219 llvm::StructType *PropertyTy;
221 /// PropertyListTy - LLVM type for struct objc_property_list
222 /// (_prop_list_t in GCC parlance).
223 llvm::StructType *PropertyListTy;
224 /// PropertyListPtrTy - LLVM type for struct objc_property_list*.
225 llvm::PointerType *PropertyListPtrTy;
227 // MethodTy - LLVM type for struct objc_method.
228 llvm::StructType *MethodTy;
230 /// CacheTy - LLVM type for struct objc_cache.
232 /// CachePtrTy - LLVM type for struct objc_cache *.
233 llvm::PointerType *CachePtrTy;
235 llvm::Constant *getGetPropertyFn() {
236 CodeGen::CodeGenTypes &Types = CGM.getTypes();
237 ASTContext &Ctx = CGM.getContext();
238 // id objc_getProperty (id, SEL, ptrdiff_t, bool)
239 CanQualType IdType = Ctx.getCanonicalParamType(Ctx.getObjCIdType());
240 CanQualType SelType = Ctx.getCanonicalParamType(Ctx.getObjCSelType());
241 CanQualType Params[] = {
243 Ctx.getPointerDiffType()->getCanonicalTypeUnqualified(), Ctx.BoolTy};
244 llvm::FunctionType *FTy =
245 Types.GetFunctionType(
246 Types.arrangeBuiltinFunctionDeclaration(IdType, Params));
247 return CGM.CreateRuntimeFunction(FTy, "objc_getProperty");
250 llvm::Constant *getSetPropertyFn() {
251 CodeGen::CodeGenTypes &Types = CGM.getTypes();
252 ASTContext &Ctx = CGM.getContext();
253 // void objc_setProperty (id, SEL, ptrdiff_t, id, bool, bool)
254 CanQualType IdType = Ctx.getCanonicalParamType(Ctx.getObjCIdType());
255 CanQualType SelType = Ctx.getCanonicalParamType(Ctx.getObjCSelType());
256 CanQualType Params[] = {
259 Ctx.getPointerDiffType()->getCanonicalTypeUnqualified(),
263 llvm::FunctionType *FTy =
264 Types.GetFunctionType(
265 Types.arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, Params));
266 return CGM.CreateRuntimeFunction(FTy, "objc_setProperty");
269 llvm::Constant *getOptimizedSetPropertyFn(bool atomic, bool copy) {
270 CodeGen::CodeGenTypes &Types = CGM.getTypes();
271 ASTContext &Ctx = CGM.getContext();
272 // void objc_setProperty_atomic(id self, SEL _cmd,
273 // id newValue, ptrdiff_t offset);
274 // void objc_setProperty_nonatomic(id self, SEL _cmd,
275 // id newValue, ptrdiff_t offset);
276 // void objc_setProperty_atomic_copy(id self, SEL _cmd,
277 // id newValue, ptrdiff_t offset);
278 // void objc_setProperty_nonatomic_copy(id self, SEL _cmd,
279 // id newValue, ptrdiff_t offset);
281 SmallVector<CanQualType,4> Params;
282 CanQualType IdType = Ctx.getCanonicalParamType(Ctx.getObjCIdType());
283 CanQualType SelType = Ctx.getCanonicalParamType(Ctx.getObjCSelType());
284 Params.push_back(IdType);
285 Params.push_back(SelType);
286 Params.push_back(IdType);
287 Params.push_back(Ctx.getPointerDiffType()->getCanonicalTypeUnqualified());
288 llvm::FunctionType *FTy =
289 Types.GetFunctionType(
290 Types.arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, Params));
293 name = "objc_setProperty_atomic_copy";
294 else if (atomic && !copy)
295 name = "objc_setProperty_atomic";
296 else if (!atomic && copy)
297 name = "objc_setProperty_nonatomic_copy";
299 name = "objc_setProperty_nonatomic";
301 return CGM.CreateRuntimeFunction(FTy, name);
304 llvm::Constant *getCopyStructFn() {
305 CodeGen::CodeGenTypes &Types = CGM.getTypes();
306 ASTContext &Ctx = CGM.getContext();
307 // void objc_copyStruct (void *, const void *, size_t, bool, bool)
308 SmallVector<CanQualType,5> Params;
309 Params.push_back(Ctx.VoidPtrTy);
310 Params.push_back(Ctx.VoidPtrTy);
311 Params.push_back(Ctx.getSizeType());
312 Params.push_back(Ctx.BoolTy);
313 Params.push_back(Ctx.BoolTy);
314 llvm::FunctionType *FTy =
315 Types.GetFunctionType(
316 Types.arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, Params));
317 return CGM.CreateRuntimeFunction(FTy, "objc_copyStruct");
320 /// This routine declares and returns address of:
321 /// void objc_copyCppObjectAtomic(
322 /// void *dest, const void *src,
323 /// void (*copyHelper) (void *dest, const void *source));
324 llvm::Constant *getCppAtomicObjectFunction() {
325 CodeGen::CodeGenTypes &Types = CGM.getTypes();
326 ASTContext &Ctx = CGM.getContext();
327 /// void objc_copyCppObjectAtomic(void *dest, const void *src, void *helper);
328 SmallVector<CanQualType,3> Params;
329 Params.push_back(Ctx.VoidPtrTy);
330 Params.push_back(Ctx.VoidPtrTy);
331 Params.push_back(Ctx.VoidPtrTy);
332 llvm::FunctionType *FTy =
333 Types.GetFunctionType(
334 Types.arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, Params));
335 return CGM.CreateRuntimeFunction(FTy, "objc_copyCppObjectAtomic");
338 llvm::Constant *getEnumerationMutationFn() {
339 CodeGen::CodeGenTypes &Types = CGM.getTypes();
340 ASTContext &Ctx = CGM.getContext();
341 // void objc_enumerationMutation (id)
342 SmallVector<CanQualType,1> Params;
343 Params.push_back(Ctx.getCanonicalParamType(Ctx.getObjCIdType()));
344 llvm::FunctionType *FTy =
345 Types.GetFunctionType(
346 Types.arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, Params));
347 return CGM.CreateRuntimeFunction(FTy, "objc_enumerationMutation");
350 llvm::Constant *getLookUpClassFn() {
351 CodeGen::CodeGenTypes &Types = CGM.getTypes();
352 ASTContext &Ctx = CGM.getContext();
353 // Class objc_lookUpClass (const char *)
354 SmallVector<CanQualType,1> Params;
356 Ctx.getCanonicalType(Ctx.getPointerType(Ctx.CharTy.withConst())));
357 llvm::FunctionType *FTy =
358 Types.GetFunctionType(Types.arrangeBuiltinFunctionDeclaration(
359 Ctx.getCanonicalType(Ctx.getObjCClassType()),
361 return CGM.CreateRuntimeFunction(FTy, "objc_lookUpClass");
364 /// GcReadWeakFn -- LLVM objc_read_weak (id *src) function.
365 llvm::Constant *getGcReadWeakFn() {
366 // id objc_read_weak (id *)
367 llvm::Type *args[] = { ObjectPtrTy->getPointerTo() };
368 llvm::FunctionType *FTy =
369 llvm::FunctionType::get(ObjectPtrTy, args, false);
370 return CGM.CreateRuntimeFunction(FTy, "objc_read_weak");
373 /// GcAssignWeakFn -- LLVM objc_assign_weak function.
374 llvm::Constant *getGcAssignWeakFn() {
375 // id objc_assign_weak (id, id *)
376 llvm::Type *args[] = { ObjectPtrTy, ObjectPtrTy->getPointerTo() };
377 llvm::FunctionType *FTy =
378 llvm::FunctionType::get(ObjectPtrTy, args, false);
379 return CGM.CreateRuntimeFunction(FTy, "objc_assign_weak");
382 /// GcAssignGlobalFn -- LLVM objc_assign_global function.
383 llvm::Constant *getGcAssignGlobalFn() {
384 // id objc_assign_global(id, id *)
385 llvm::Type *args[] = { ObjectPtrTy, ObjectPtrTy->getPointerTo() };
386 llvm::FunctionType *FTy =
387 llvm::FunctionType::get(ObjectPtrTy, args, false);
388 return CGM.CreateRuntimeFunction(FTy, "objc_assign_global");
391 /// GcAssignThreadLocalFn -- LLVM objc_assign_threadlocal function.
392 llvm::Constant *getGcAssignThreadLocalFn() {
393 // id objc_assign_threadlocal(id src, id * dest)
394 llvm::Type *args[] = { ObjectPtrTy, ObjectPtrTy->getPointerTo() };
395 llvm::FunctionType *FTy =
396 llvm::FunctionType::get(ObjectPtrTy, args, false);
397 return CGM.CreateRuntimeFunction(FTy, "objc_assign_threadlocal");
400 /// GcAssignIvarFn -- LLVM objc_assign_ivar function.
401 llvm::Constant *getGcAssignIvarFn() {
402 // id objc_assign_ivar(id, id *, ptrdiff_t)
403 llvm::Type *args[] = { ObjectPtrTy, ObjectPtrTy->getPointerTo(),
405 llvm::FunctionType *FTy =
406 llvm::FunctionType::get(ObjectPtrTy, args, false);
407 return CGM.CreateRuntimeFunction(FTy, "objc_assign_ivar");
410 /// GcMemmoveCollectableFn -- LLVM objc_memmove_collectable function.
411 llvm::Constant *GcMemmoveCollectableFn() {
412 // void *objc_memmove_collectable(void *dst, const void *src, size_t size)
413 llvm::Type *args[] = { Int8PtrTy, Int8PtrTy, LongTy };
414 llvm::FunctionType *FTy = llvm::FunctionType::get(Int8PtrTy, args, false);
415 return CGM.CreateRuntimeFunction(FTy, "objc_memmove_collectable");
418 /// GcAssignStrongCastFn -- LLVM objc_assign_strongCast function.
419 llvm::Constant *getGcAssignStrongCastFn() {
420 // id objc_assign_strongCast(id, id *)
421 llvm::Type *args[] = { ObjectPtrTy, ObjectPtrTy->getPointerTo() };
422 llvm::FunctionType *FTy =
423 llvm::FunctionType::get(ObjectPtrTy, args, false);
424 return CGM.CreateRuntimeFunction(FTy, "objc_assign_strongCast");
427 /// ExceptionThrowFn - LLVM objc_exception_throw function.
428 llvm::Constant *getExceptionThrowFn() {
429 // void objc_exception_throw(id)
430 llvm::Type *args[] = { ObjectPtrTy };
431 llvm::FunctionType *FTy =
432 llvm::FunctionType::get(CGM.VoidTy, args, false);
433 return CGM.CreateRuntimeFunction(FTy, "objc_exception_throw");
436 /// ExceptionRethrowFn - LLVM objc_exception_rethrow function.
437 llvm::Constant *getExceptionRethrowFn() {
438 // void objc_exception_rethrow(void)
439 llvm::FunctionType *FTy = llvm::FunctionType::get(CGM.VoidTy, false);
440 return CGM.CreateRuntimeFunction(FTy, "objc_exception_rethrow");
443 /// SyncEnterFn - LLVM object_sync_enter function.
444 llvm::Constant *getSyncEnterFn() {
445 // int objc_sync_enter (id)
446 llvm::Type *args[] = { ObjectPtrTy };
447 llvm::FunctionType *FTy =
448 llvm::FunctionType::get(CGM.IntTy, args, false);
449 return CGM.CreateRuntimeFunction(FTy, "objc_sync_enter");
452 /// SyncExitFn - LLVM object_sync_exit function.
453 llvm::Constant *getSyncExitFn() {
454 // int objc_sync_exit (id)
455 llvm::Type *args[] = { ObjectPtrTy };
456 llvm::FunctionType *FTy =
457 llvm::FunctionType::get(CGM.IntTy, args, false);
458 return CGM.CreateRuntimeFunction(FTy, "objc_sync_exit");
461 llvm::Constant *getSendFn(bool IsSuper) const {
462 return IsSuper ? getMessageSendSuperFn() : getMessageSendFn();
465 llvm::Constant *getSendFn2(bool IsSuper) const {
466 return IsSuper ? getMessageSendSuperFn2() : getMessageSendFn();
469 llvm::Constant *getSendStretFn(bool IsSuper) const {
470 return IsSuper ? getMessageSendSuperStretFn() : getMessageSendStretFn();
473 llvm::Constant *getSendStretFn2(bool IsSuper) const {
474 return IsSuper ? getMessageSendSuperStretFn2() : getMessageSendStretFn();
477 llvm::Constant *getSendFpretFn(bool IsSuper) const {
478 return IsSuper ? getMessageSendSuperFpretFn() : getMessageSendFpretFn();
481 llvm::Constant *getSendFpretFn2(bool IsSuper) const {
482 return IsSuper ? getMessageSendSuperFpretFn2() : getMessageSendFpretFn();
485 llvm::Constant *getSendFp2retFn(bool IsSuper) const {
486 return IsSuper ? getMessageSendSuperFn() : getMessageSendFp2retFn();
489 llvm::Constant *getSendFp2RetFn2(bool IsSuper) const {
490 return IsSuper ? getMessageSendSuperFn2() : getMessageSendFp2retFn();
493 ObjCCommonTypesHelper(CodeGen::CodeGenModule &cgm);
496 /// ObjCTypesHelper - Helper class that encapsulates lazy
497 /// construction of varies types used during ObjC generation.
498 class ObjCTypesHelper : public ObjCCommonTypesHelper {
500 /// SymtabTy - LLVM type for struct objc_symtab.
501 llvm::StructType *SymtabTy;
502 /// SymtabPtrTy - LLVM type for struct objc_symtab *.
503 llvm::PointerType *SymtabPtrTy;
504 /// ModuleTy - LLVM type for struct objc_module.
505 llvm::StructType *ModuleTy;
507 /// ProtocolTy - LLVM type for struct objc_protocol.
508 llvm::StructType *ProtocolTy;
509 /// ProtocolPtrTy - LLVM type for struct objc_protocol *.
510 llvm::PointerType *ProtocolPtrTy;
511 /// ProtocolExtensionTy - LLVM type for struct
512 /// objc_protocol_extension.
513 llvm::StructType *ProtocolExtensionTy;
514 /// ProtocolExtensionTy - LLVM type for struct
515 /// objc_protocol_extension *.
516 llvm::PointerType *ProtocolExtensionPtrTy;
517 /// MethodDescriptionTy - LLVM type for struct
518 /// objc_method_description.
519 llvm::StructType *MethodDescriptionTy;
520 /// MethodDescriptionListTy - LLVM type for struct
521 /// objc_method_description_list.
522 llvm::StructType *MethodDescriptionListTy;
523 /// MethodDescriptionListPtrTy - LLVM type for struct
524 /// objc_method_description_list *.
525 llvm::PointerType *MethodDescriptionListPtrTy;
526 /// ProtocolListTy - LLVM type for struct objc_property_list.
527 llvm::StructType *ProtocolListTy;
528 /// ProtocolListPtrTy - LLVM type for struct objc_property_list*.
529 llvm::PointerType *ProtocolListPtrTy;
530 /// CategoryTy - LLVM type for struct objc_category.
531 llvm::StructType *CategoryTy;
532 /// ClassTy - LLVM type for struct objc_class.
533 llvm::StructType *ClassTy;
534 /// ClassPtrTy - LLVM type for struct objc_class *.
535 llvm::PointerType *ClassPtrTy;
536 /// ClassExtensionTy - LLVM type for struct objc_class_ext.
537 llvm::StructType *ClassExtensionTy;
538 /// ClassExtensionPtrTy - LLVM type for struct objc_class_ext *.
539 llvm::PointerType *ClassExtensionPtrTy;
540 // IvarTy - LLVM type for struct objc_ivar.
541 llvm::StructType *IvarTy;
542 /// IvarListTy - LLVM type for struct objc_ivar_list.
543 llvm::StructType *IvarListTy;
544 /// IvarListPtrTy - LLVM type for struct objc_ivar_list *.
545 llvm::PointerType *IvarListPtrTy;
546 /// MethodListTy - LLVM type for struct objc_method_list.
547 llvm::StructType *MethodListTy;
548 /// MethodListPtrTy - LLVM type for struct objc_method_list *.
549 llvm::PointerType *MethodListPtrTy;
551 /// ExceptionDataTy - LLVM type for struct _objc_exception_data.
552 llvm::StructType *ExceptionDataTy;
554 /// ExceptionTryEnterFn - LLVM objc_exception_try_enter function.
555 llvm::Constant *getExceptionTryEnterFn() {
556 llvm::Type *params[] = { ExceptionDataTy->getPointerTo() };
557 return CGM.CreateRuntimeFunction(
558 llvm::FunctionType::get(CGM.VoidTy, params, false),
559 "objc_exception_try_enter");
562 /// ExceptionTryExitFn - LLVM objc_exception_try_exit function.
563 llvm::Constant *getExceptionTryExitFn() {
564 llvm::Type *params[] = { ExceptionDataTy->getPointerTo() };
565 return CGM.CreateRuntimeFunction(
566 llvm::FunctionType::get(CGM.VoidTy, params, false),
567 "objc_exception_try_exit");
570 /// ExceptionExtractFn - LLVM objc_exception_extract function.
571 llvm::Constant *getExceptionExtractFn() {
572 llvm::Type *params[] = { ExceptionDataTy->getPointerTo() };
573 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy,
575 "objc_exception_extract");
578 /// ExceptionMatchFn - LLVM objc_exception_match function.
579 llvm::Constant *getExceptionMatchFn() {
580 llvm::Type *params[] = { ClassPtrTy, ObjectPtrTy };
581 return CGM.CreateRuntimeFunction(
582 llvm::FunctionType::get(CGM.Int32Ty, params, false),
583 "objc_exception_match");
586 /// SetJmpFn - LLVM _setjmp function.
587 llvm::Constant *getSetJmpFn() {
588 // This is specifically the prototype for x86.
589 llvm::Type *params[] = { CGM.Int32Ty->getPointerTo() };
590 return CGM.CreateRuntimeFunction(
591 llvm::FunctionType::get(CGM.Int32Ty, params, false), "_setjmp",
592 llvm::AttributeList::get(CGM.getLLVMContext(),
593 llvm::AttributeList::FunctionIndex,
594 llvm::Attribute::NonLazyBind));
598 ObjCTypesHelper(CodeGen::CodeGenModule &cgm);
601 /// ObjCNonFragileABITypesHelper - will have all types needed by objective-c's
603 class ObjCNonFragileABITypesHelper : public ObjCCommonTypesHelper {
605 // MethodListnfABITy - LLVM for struct _method_list_t
606 llvm::StructType *MethodListnfABITy;
608 // MethodListnfABIPtrTy - LLVM for struct _method_list_t*
609 llvm::PointerType *MethodListnfABIPtrTy;
611 // ProtocolnfABITy = LLVM for struct _protocol_t
612 llvm::StructType *ProtocolnfABITy;
614 // ProtocolnfABIPtrTy = LLVM for struct _protocol_t*
615 llvm::PointerType *ProtocolnfABIPtrTy;
617 // ProtocolListnfABITy - LLVM for struct _objc_protocol_list
618 llvm::StructType *ProtocolListnfABITy;
620 // ProtocolListnfABIPtrTy - LLVM for struct _objc_protocol_list*
621 llvm::PointerType *ProtocolListnfABIPtrTy;
623 // ClassnfABITy - LLVM for struct _class_t
624 llvm::StructType *ClassnfABITy;
626 // ClassnfABIPtrTy - LLVM for struct _class_t*
627 llvm::PointerType *ClassnfABIPtrTy;
629 // IvarnfABITy - LLVM for struct _ivar_t
630 llvm::StructType *IvarnfABITy;
632 // IvarListnfABITy - LLVM for struct _ivar_list_t
633 llvm::StructType *IvarListnfABITy;
635 // IvarListnfABIPtrTy = LLVM for struct _ivar_list_t*
636 llvm::PointerType *IvarListnfABIPtrTy;
638 // ClassRonfABITy - LLVM for struct _class_ro_t
639 llvm::StructType *ClassRonfABITy;
641 // ImpnfABITy - LLVM for id (*)(id, SEL, ...)
642 llvm::PointerType *ImpnfABITy;
644 // CategorynfABITy - LLVM for struct _category_t
645 llvm::StructType *CategorynfABITy;
647 // New types for nonfragile abi messaging.
649 // MessageRefTy - LLVM for:
650 // struct _message_ref_t {
654 llvm::StructType *MessageRefTy;
655 // MessageRefCTy - clang type for struct _message_ref_t
656 QualType MessageRefCTy;
658 // MessageRefPtrTy - LLVM for struct _message_ref_t*
659 llvm::Type *MessageRefPtrTy;
660 // MessageRefCPtrTy - clang type for struct _message_ref_t*
661 QualType MessageRefCPtrTy;
663 // SuperMessageRefTy - LLVM for:
664 // struct _super_message_ref_t {
665 // SUPER_IMP messenger;
668 llvm::StructType *SuperMessageRefTy;
670 // SuperMessageRefPtrTy - LLVM for struct _super_message_ref_t*
671 llvm::PointerType *SuperMessageRefPtrTy;
673 llvm::Constant *getMessageSendFixupFn() {
674 // id objc_msgSend_fixup(id, struct message_ref_t*, ...)
675 llvm::Type *params[] = { ObjectPtrTy, MessageRefPtrTy };
676 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy,
678 "objc_msgSend_fixup");
681 llvm::Constant *getMessageSendFpretFixupFn() {
682 // id objc_msgSend_fpret_fixup(id, struct message_ref_t*, ...)
683 llvm::Type *params[] = { ObjectPtrTy, MessageRefPtrTy };
684 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy,
686 "objc_msgSend_fpret_fixup");
689 llvm::Constant *getMessageSendStretFixupFn() {
690 // id objc_msgSend_stret_fixup(id, struct message_ref_t*, ...)
691 llvm::Type *params[] = { ObjectPtrTy, MessageRefPtrTy };
692 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy,
694 "objc_msgSend_stret_fixup");
697 llvm::Constant *getMessageSendSuper2FixupFn() {
698 // id objc_msgSendSuper2_fixup (struct objc_super *,
699 // struct _super_message_ref_t*, ...)
700 llvm::Type *params[] = { SuperPtrTy, SuperMessageRefPtrTy };
701 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy,
703 "objc_msgSendSuper2_fixup");
706 llvm::Constant *getMessageSendSuper2StretFixupFn() {
707 // id objc_msgSendSuper2_stret_fixup(struct objc_super *,
708 // struct _super_message_ref_t*, ...)
709 llvm::Type *params[] = { SuperPtrTy, SuperMessageRefPtrTy };
710 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy,
712 "objc_msgSendSuper2_stret_fixup");
715 llvm::Constant *getObjCEndCatchFn() {
716 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(CGM.VoidTy, false),
721 llvm::Constant *getObjCBeginCatchFn() {
722 llvm::Type *params[] = { Int8PtrTy };
723 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(Int8PtrTy,
728 llvm::StructType *EHTypeTy;
729 llvm::Type *EHTypePtrTy;
731 ObjCNonFragileABITypesHelper(CodeGen::CodeGenModule &cgm);
734 enum class ObjCLabelType {
741 class CGObjCCommonMac : public CodeGen::CGObjCRuntime {
747 SKIP_SCAN(unsigned _skip = 0, unsigned _scan = 0)
748 : skip(_skip), scan(_scan) {}
751 /// opcode for captured block variables layout 'instructions'.
752 /// In the following descriptions, 'I' is the value of the immediate field.
753 /// (field following the opcode).
755 enum BLOCK_LAYOUT_OPCODE {
756 /// An operator which affects how the following layout should be
758 /// I == 0: Halt interpretation and treat everything else as
759 /// a non-pointer. Note that this instruction is equal
761 /// I != 0: Currently unused.
762 BLOCK_LAYOUT_OPERATOR = 0,
764 /// The next I+1 bytes do not contain a value of object pointer type.
765 /// Note that this can leave the stream unaligned, meaning that
766 /// subsequent word-size instructions do not begin at a multiple of
767 /// the pointer size.
768 BLOCK_LAYOUT_NON_OBJECT_BYTES = 1,
770 /// The next I+1 words do not contain a value of object pointer type.
771 /// This is simply an optimized version of BLOCK_LAYOUT_BYTES for
772 /// when the required skip quantity is a multiple of the pointer size.
773 BLOCK_LAYOUT_NON_OBJECT_WORDS = 2,
775 /// The next I+1 words are __strong pointers to Objective-C
776 /// objects or blocks.
777 BLOCK_LAYOUT_STRONG = 3,
779 /// The next I+1 words are pointers to __block variables.
780 BLOCK_LAYOUT_BYREF = 4,
782 /// The next I+1 words are __weak pointers to Objective-C
783 /// objects or blocks.
784 BLOCK_LAYOUT_WEAK = 5,
786 /// The next I+1 words are __unsafe_unretained pointers to
787 /// Objective-C objects or blocks.
788 BLOCK_LAYOUT_UNRETAINED = 6
790 /// The next I+1 words are block or object pointers with some
791 /// as-yet-unspecified ownership semantics. If we add more
792 /// flavors of ownership semantics, values will be taken from
795 /// This is included so that older tools can at least continue
796 /// processing the layout past such things.
797 //BLOCK_LAYOUT_OWNERSHIP_UNKNOWN = 7..10,
799 /// All other opcodes are reserved. Halt interpretation and
800 /// treat everything else as opaque.
805 enum BLOCK_LAYOUT_OPCODE opcode;
806 CharUnits block_var_bytepos;
807 CharUnits block_var_size;
808 RUN_SKIP(enum BLOCK_LAYOUT_OPCODE Opcode = BLOCK_LAYOUT_OPERATOR,
809 CharUnits BytePos = CharUnits::Zero(),
810 CharUnits Size = CharUnits::Zero())
811 : opcode(Opcode), block_var_bytepos(BytePos), block_var_size(Size) {}
813 // Allow sorting based on byte pos.
814 bool operator<(const RUN_SKIP &b) const {
815 return block_var_bytepos < b.block_var_bytepos;
820 llvm::LLVMContext &VMContext;
821 // FIXME! May not be needing this after all.
824 // arc/mrr layout of captured block literal variables.
825 SmallVector<RUN_SKIP, 16> RunSkipBlockVars;
827 /// LazySymbols - Symbols to generate a lazy reference for. See
828 /// DefinedSymbols and FinishModule().
829 llvm::SetVector<IdentifierInfo*> LazySymbols;
831 /// DefinedSymbols - External symbols which are defined by this
832 /// module. The symbols in this list and LazySymbols are used to add
833 /// special linker symbols which ensure that Objective-C modules are
835 llvm::SetVector<IdentifierInfo*> DefinedSymbols;
837 /// ClassNames - uniqued class names.
838 llvm::StringMap<llvm::GlobalVariable*> ClassNames;
840 /// MethodVarNames - uniqued method variable names.
841 llvm::DenseMap<Selector, llvm::GlobalVariable*> MethodVarNames;
843 /// DefinedCategoryNames - list of category names in form Class_Category.
844 llvm::SmallSetVector<llvm::CachedHashString, 16> DefinedCategoryNames;
846 /// MethodVarTypes - uniqued method type signatures. We have to use
847 /// a StringMap here because have no other unique reference.
848 llvm::StringMap<llvm::GlobalVariable*> MethodVarTypes;
850 /// MethodDefinitions - map of methods which have been defined in
851 /// this translation unit.
852 llvm::DenseMap<const ObjCMethodDecl*, llvm::Function*> MethodDefinitions;
854 /// PropertyNames - uniqued method variable names.
855 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> PropertyNames;
857 /// ClassReferences - uniqued class references.
858 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> ClassReferences;
860 /// SelectorReferences - uniqued selector references.
861 llvm::DenseMap<Selector, llvm::GlobalVariable*> SelectorReferences;
863 /// Protocols - Protocols for which an objc_protocol structure has
864 /// been emitted. Forward declarations are handled by creating an
865 /// empty structure whose initializer is filled in when/if defined.
866 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> Protocols;
868 /// DefinedProtocols - Protocols which have actually been
869 /// defined. We should not need this, see FIXME in GenerateProtocol.
870 llvm::DenseSet<IdentifierInfo*> DefinedProtocols;
872 /// DefinedClasses - List of defined classes.
873 SmallVector<llvm::GlobalValue*, 16> DefinedClasses;
875 /// ImplementedClasses - List of @implemented classes.
876 SmallVector<const ObjCInterfaceDecl*, 16> ImplementedClasses;
878 /// DefinedNonLazyClasses - List of defined "non-lazy" classes.
879 SmallVector<llvm::GlobalValue*, 16> DefinedNonLazyClasses;
881 /// DefinedCategories - List of defined categories.
882 SmallVector<llvm::GlobalValue*, 16> DefinedCategories;
884 /// DefinedNonLazyCategories - List of defined "non-lazy" categories.
885 SmallVector<llvm::GlobalValue*, 16> DefinedNonLazyCategories;
887 /// Cached reference to the class for constant strings. This value has type
888 /// int * but is actually an Obj-C class pointer.
889 llvm::WeakTrackingVH ConstantStringClassRef;
891 /// \brief The LLVM type corresponding to NSConstantString.
892 llvm::StructType *NSConstantStringType = nullptr;
894 llvm::StringMap<llvm::GlobalVariable *> NSConstantStringMap;
896 /// GetNameForMethod - Return a name for the given method.
897 /// \param[out] NameOut - The return value.
898 void GetNameForMethod(const ObjCMethodDecl *OMD,
899 const ObjCContainerDecl *CD,
900 SmallVectorImpl<char> &NameOut);
902 /// GetMethodVarName - Return a unique constant for the given
903 /// selector's name. The return value has type char *.
904 llvm::Constant *GetMethodVarName(Selector Sel);
905 llvm::Constant *GetMethodVarName(IdentifierInfo *Ident);
907 /// GetMethodVarType - Return a unique constant for the given
908 /// method's type encoding string. The return value has type char *.
910 // FIXME: This is a horrible name.
911 llvm::Constant *GetMethodVarType(const ObjCMethodDecl *D,
912 bool Extended = false);
913 llvm::Constant *GetMethodVarType(const FieldDecl *D);
915 /// GetPropertyName - Return a unique constant for the given
916 /// name. The return value has type char *.
917 llvm::Constant *GetPropertyName(IdentifierInfo *Ident);
919 // FIXME: This can be dropped once string functions are unified.
920 llvm::Constant *GetPropertyTypeString(const ObjCPropertyDecl *PD,
921 const Decl *Container);
923 /// GetClassName - Return a unique constant for the given selector's
924 /// runtime name (which may change via use of objc_runtime_name attribute on
925 /// class or protocol definition. The return value has type char *.
926 llvm::Constant *GetClassName(StringRef RuntimeName);
928 llvm::Function *GetMethodDefinition(const ObjCMethodDecl *MD);
930 /// BuildIvarLayout - Builds ivar layout bitmap for the class
931 /// implementation for the __strong or __weak case.
933 /// \param hasMRCWeakIvars - Whether we are compiling in MRC and there
934 /// are any weak ivars defined directly in the class. Meaningless unless
935 /// building a weak layout. Does not guarantee that the layout will
936 /// actually have any entries, because the ivar might be under-aligned.
937 llvm::Constant *BuildIvarLayout(const ObjCImplementationDecl *OI,
938 CharUnits beginOffset,
940 bool forStrongLayout,
941 bool hasMRCWeakIvars);
943 llvm::Constant *BuildStrongIvarLayout(const ObjCImplementationDecl *OI,
944 CharUnits beginOffset,
945 CharUnits endOffset) {
946 return BuildIvarLayout(OI, beginOffset, endOffset, true, false);
949 llvm::Constant *BuildWeakIvarLayout(const ObjCImplementationDecl *OI,
950 CharUnits beginOffset,
952 bool hasMRCWeakIvars) {
953 return BuildIvarLayout(OI, beginOffset, endOffset, false, hasMRCWeakIvars);
956 Qualifiers::ObjCLifetime getBlockCaptureLifetime(QualType QT, bool ByrefLayout);
958 void UpdateRunSkipBlockVars(bool IsByref,
959 Qualifiers::ObjCLifetime LifeTime,
960 CharUnits FieldOffset,
961 CharUnits FieldSize);
963 void BuildRCBlockVarRecordLayout(const RecordType *RT,
964 CharUnits BytePos, bool &HasUnion,
965 bool ByrefLayout=false);
967 void BuildRCRecordLayout(const llvm::StructLayout *RecLayout,
968 const RecordDecl *RD,
969 ArrayRef<const FieldDecl*> RecFields,
970 CharUnits BytePos, bool &HasUnion,
973 uint64_t InlineLayoutInstruction(SmallVectorImpl<unsigned char> &Layout);
975 llvm::Constant *getBitmapBlockLayout(bool ComputeByrefLayout);
977 /// GetIvarLayoutName - Returns a unique constant for the given
978 /// ivar layout bitmap.
979 llvm::Constant *GetIvarLayoutName(IdentifierInfo *Ident,
980 const ObjCCommonTypesHelper &ObjCTypes);
982 /// EmitPropertyList - Emit the given property list. The return
983 /// value has type PropertyListPtrTy.
984 llvm::Constant *EmitPropertyList(Twine Name,
985 const Decl *Container,
986 const ObjCContainerDecl *OCD,
987 const ObjCCommonTypesHelper &ObjCTypes,
988 bool IsClassProperty);
990 /// EmitProtocolMethodTypes - Generate the array of extended method type
991 /// strings. The return value has type Int8PtrPtrTy.
992 llvm::Constant *EmitProtocolMethodTypes(Twine Name,
993 ArrayRef<llvm::Constant*> MethodTypes,
994 const ObjCCommonTypesHelper &ObjCTypes);
996 /// GetProtocolRef - Return a reference to the internal protocol
997 /// description, creating an empty one if it has not been
998 /// defined. The return value has type ProtocolPtrTy.
999 llvm::Constant *GetProtocolRef(const ObjCProtocolDecl *PD);
1001 /// Return a reference to the given Class using runtime calls rather than
1002 /// by a symbol reference.
1003 llvm::Value *EmitClassRefViaRuntime(CodeGenFunction &CGF,
1004 const ObjCInterfaceDecl *ID,
1005 ObjCCommonTypesHelper &ObjCTypes);
1007 std::string GetSectionName(StringRef Section, StringRef MachOAttributes);
1010 /// CreateMetadataVar - Create a global variable with internal
1011 /// linkage for use by the Objective-C runtime.
1013 /// This is a convenience wrapper which not only creates the
1014 /// variable, but also sets the section and alignment and adds the
1015 /// global to the "llvm.used" list.
1017 /// \param Name - The variable name.
1018 /// \param Init - The variable initializer; this is also used to
1019 /// define the type of the variable.
1020 /// \param Section - The section the variable should go into, or empty.
1021 /// \param Align - The alignment for the variable, or 0.
1022 /// \param AddToUsed - Whether the variable should be added to
1024 llvm::GlobalVariable *CreateMetadataVar(Twine Name,
1025 ConstantStructBuilder &Init,
1026 StringRef Section, CharUnits Align,
1028 llvm::GlobalVariable *CreateMetadataVar(Twine Name,
1029 llvm::Constant *Init,
1030 StringRef Section, CharUnits Align,
1033 llvm::GlobalVariable *CreateCStringLiteral(StringRef Name,
1034 ObjCLabelType LabelType,
1035 bool ForceNonFragileABI = false,
1036 bool NullTerminate = true);
1039 CodeGen::RValue EmitMessageSend(CodeGen::CodeGenFunction &CGF,
1040 ReturnValueSlot Return,
1041 QualType ResultType,
1046 const CallArgList &CallArgs,
1047 const ObjCMethodDecl *OMD,
1048 const ObjCInterfaceDecl *ClassReceiver,
1049 const ObjCCommonTypesHelper &ObjCTypes);
1051 /// EmitImageInfo - Emit the image info marker used to encode some module
1052 /// level information.
1053 void EmitImageInfo();
1056 CGObjCCommonMac(CodeGen::CodeGenModule &cgm) :
1057 CGObjCRuntime(cgm), VMContext(cgm.getLLVMContext()) { }
1059 bool isNonFragileABI() const {
1060 return ObjCABI == 2;
1063 ConstantAddress GenerateConstantString(const StringLiteral *SL) override;
1064 ConstantAddress GenerateConstantNSString(const StringLiteral *SL);
1066 llvm::Function *GenerateMethod(const ObjCMethodDecl *OMD,
1067 const ObjCContainerDecl *CD=nullptr) override;
1069 void GenerateProtocol(const ObjCProtocolDecl *PD) override;
1071 /// GetOrEmitProtocol - Get the protocol object for the given
1072 /// declaration, emitting it if necessary. The return value has type
1074 virtual llvm::Constant *GetOrEmitProtocol(const ObjCProtocolDecl *PD)=0;
1076 /// GetOrEmitProtocolRef - Get a forward reference to the protocol
1077 /// object for the given declaration, emitting it if needed. These
1078 /// forward references will be filled in with empty bodies if no
1079 /// definition is seen. The return value has type ProtocolPtrTy.
1080 virtual llvm::Constant *GetOrEmitProtocolRef(const ObjCProtocolDecl *PD)=0;
1082 virtual llvm::Constant *getNSConstantStringClassRef() = 0;
1084 llvm::Constant *BuildGCBlockLayout(CodeGen::CodeGenModule &CGM,
1085 const CGBlockInfo &blockInfo) override;
1086 llvm::Constant *BuildRCBlockLayout(CodeGen::CodeGenModule &CGM,
1087 const CGBlockInfo &blockInfo) override;
1089 llvm::Constant *BuildByrefLayout(CodeGen::CodeGenModule &CGM,
1090 QualType T) override;
1095 enum class MethodListType {
1096 CategoryInstanceMethods,
1097 CategoryClassMethods,
1100 ProtocolInstanceMethods,
1101 ProtocolClassMethods,
1102 OptionalProtocolInstanceMethods,
1103 OptionalProtocolClassMethods,
1106 /// A convenience class for splitting the methods of a protocol into
1107 /// the four interesting groups.
1108 class ProtocolMethodLists {
1111 RequiredInstanceMethods,
1112 RequiredClassMethods,
1113 OptionalInstanceMethods,
1114 OptionalClassMethods
1117 NumProtocolMethodLists = 4
1120 static MethodListType getMethodListKind(Kind kind) {
1122 case RequiredInstanceMethods:
1123 return MethodListType::ProtocolInstanceMethods;
1124 case RequiredClassMethods:
1125 return MethodListType::ProtocolClassMethods;
1126 case OptionalInstanceMethods:
1127 return MethodListType::OptionalProtocolInstanceMethods;
1128 case OptionalClassMethods:
1129 return MethodListType::OptionalProtocolClassMethods;
1131 llvm_unreachable("bad kind");
1134 SmallVector<const ObjCMethodDecl *, 4> Methods[NumProtocolMethodLists];
1136 static ProtocolMethodLists get(const ObjCProtocolDecl *PD) {
1137 ProtocolMethodLists result;
1139 for (auto MD : PD->methods()) {
1140 size_t index = (2 * size_t(MD->isOptional()))
1141 + (size_t(MD->isClassMethod()));
1142 result.Methods[index].push_back(MD);
1148 template <class Self>
1149 SmallVector<llvm::Constant*, 8> emitExtendedTypesArray(Self *self) const {
1150 // In both ABIs, the method types list is parallel with the
1151 // concatenation of the methods arrays in the following order:
1154 // optional instance methods
1155 // optional class methods
1156 SmallVector<llvm::Constant*, 8> result;
1158 // Methods is already in the correct order for both ABIs.
1159 for (auto &list : Methods) {
1160 for (auto MD : list) {
1161 result.push_back(self->GetMethodVarType(MD, true));
1168 template <class Self>
1169 llvm::Constant *emitMethodList(Self *self, const ObjCProtocolDecl *PD,
1171 return self->emitMethodList(PD->getObjCRuntimeNameAsString(),
1172 getMethodListKind(kind), Methods[kind]);
1176 } // end anonymous namespace
1178 class CGObjCMac : public CGObjCCommonMac {
1180 friend ProtocolMethodLists;
1182 ObjCTypesHelper ObjCTypes;
1184 /// EmitModuleInfo - Another marker encoding module level
1186 void EmitModuleInfo();
1188 /// EmitModuleSymols - Emit module symbols, the list of defined
1189 /// classes and categories. The result has type SymtabPtrTy.
1190 llvm::Constant *EmitModuleSymbols();
1192 /// FinishModule - Write out global data structures at the end of
1193 /// processing a translation unit.
1194 void FinishModule();
1196 /// EmitClassExtension - Generate the class extension structure used
1197 /// to store the weak ivar layout and properties. The return value
1198 /// has type ClassExtensionPtrTy.
1199 llvm::Constant *EmitClassExtension(const ObjCImplementationDecl *ID,
1200 CharUnits instanceSize,
1201 bool hasMRCWeakIvars,
1204 /// EmitClassRef - Return a Value*, of type ObjCTypes.ClassPtrTy,
1205 /// for the given class.
1206 llvm::Value *EmitClassRef(CodeGenFunction &CGF,
1207 const ObjCInterfaceDecl *ID);
1209 llvm::Value *EmitClassRefFromId(CodeGenFunction &CGF,
1210 IdentifierInfo *II);
1212 llvm::Value *EmitNSAutoreleasePoolClassRef(CodeGenFunction &CGF) override;
1214 /// EmitSuperClassRef - Emits reference to class's main metadata class.
1215 llvm::Value *EmitSuperClassRef(const ObjCInterfaceDecl *ID);
1217 /// EmitIvarList - Emit the ivar list for the given
1218 /// implementation. If ForClass is true the list of class ivars
1219 /// (i.e. metaclass ivars) is emitted, otherwise the list of
1220 /// interface ivars will be emitted. The return value has type
1222 llvm::Constant *EmitIvarList(const ObjCImplementationDecl *ID,
1225 /// EmitMetaClass - Emit a forward reference to the class structure
1226 /// for the metaclass of the given interface. The return value has
1227 /// type ClassPtrTy.
1228 llvm::Constant *EmitMetaClassRef(const ObjCInterfaceDecl *ID);
1230 /// EmitMetaClass - Emit a class structure for the metaclass of the
1231 /// given implementation. The return value has type ClassPtrTy.
1232 llvm::Constant *EmitMetaClass(const ObjCImplementationDecl *ID,
1233 llvm::Constant *Protocols,
1234 ArrayRef<const ObjCMethodDecl *> Methods);
1236 void emitMethodConstant(ConstantArrayBuilder &builder,
1237 const ObjCMethodDecl *MD);
1239 void emitMethodDescriptionConstant(ConstantArrayBuilder &builder,
1240 const ObjCMethodDecl *MD);
1242 /// EmitMethodList - Emit the method list for the given
1243 /// implementation. The return value has type MethodListPtrTy.
1244 llvm::Constant *emitMethodList(Twine Name, MethodListType MLT,
1245 ArrayRef<const ObjCMethodDecl *> Methods);
1247 /// GetOrEmitProtocol - Get the protocol object for the given
1248 /// declaration, emitting it if necessary. The return value has type
1250 llvm::Constant *GetOrEmitProtocol(const ObjCProtocolDecl *PD) override;
1252 /// GetOrEmitProtocolRef - Get a forward reference to the protocol
1253 /// object for the given declaration, emitting it if needed. These
1254 /// forward references will be filled in with empty bodies if no
1255 /// definition is seen. The return value has type ProtocolPtrTy.
1256 llvm::Constant *GetOrEmitProtocolRef(const ObjCProtocolDecl *PD) override;
1258 /// EmitProtocolExtension - Generate the protocol extension
1259 /// structure used to store optional instance and class methods, and
1260 /// protocol properties. The return value has type
1261 /// ProtocolExtensionPtrTy.
1263 EmitProtocolExtension(const ObjCProtocolDecl *PD,
1264 const ProtocolMethodLists &methodLists);
1266 /// EmitProtocolList - Generate the list of referenced
1267 /// protocols. The return value has type ProtocolListPtrTy.
1268 llvm::Constant *EmitProtocolList(Twine Name,
1269 ObjCProtocolDecl::protocol_iterator begin,
1270 ObjCProtocolDecl::protocol_iterator end);
1272 /// EmitSelector - Return a Value*, of type ObjCTypes.SelectorPtrTy,
1273 /// for the given selector.
1274 llvm::Value *EmitSelector(CodeGenFunction &CGF, Selector Sel);
1275 Address EmitSelectorAddr(CodeGenFunction &CGF, Selector Sel);
1278 CGObjCMac(CodeGen::CodeGenModule &cgm);
1280 llvm::Constant *getNSConstantStringClassRef() override;
1282 llvm::Function *ModuleInitFunction() override;
1284 CodeGen::RValue GenerateMessageSend(CodeGen::CodeGenFunction &CGF,
1285 ReturnValueSlot Return,
1286 QualType ResultType,
1287 Selector Sel, llvm::Value *Receiver,
1288 const CallArgList &CallArgs,
1289 const ObjCInterfaceDecl *Class,
1290 const ObjCMethodDecl *Method) override;
1293 GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF,
1294 ReturnValueSlot Return, QualType ResultType,
1295 Selector Sel, const ObjCInterfaceDecl *Class,
1296 bool isCategoryImpl, llvm::Value *Receiver,
1297 bool IsClassMessage, const CallArgList &CallArgs,
1298 const ObjCMethodDecl *Method) override;
1300 llvm::Value *GetClass(CodeGenFunction &CGF,
1301 const ObjCInterfaceDecl *ID) override;
1303 llvm::Value *GetSelector(CodeGenFunction &CGF, Selector Sel) override;
1304 Address GetAddrOfSelector(CodeGenFunction &CGF, Selector Sel) override;
1306 /// The NeXT/Apple runtimes do not support typed selectors; just emit an
1308 llvm::Value *GetSelector(CodeGenFunction &CGF,
1309 const ObjCMethodDecl *Method) override;
1311 llvm::Constant *GetEHType(QualType T) override;
1313 void GenerateCategory(const ObjCCategoryImplDecl *CMD) override;
1315 void GenerateClass(const ObjCImplementationDecl *ClassDecl) override;
1317 void RegisterAlias(const ObjCCompatibleAliasDecl *OAD) override {}
1319 llvm::Value *GenerateProtocolRef(CodeGenFunction &CGF,
1320 const ObjCProtocolDecl *PD) override;
1322 llvm::Constant *GetPropertyGetFunction() override;
1323 llvm::Constant *GetPropertySetFunction() override;
1324 llvm::Constant *GetOptimizedPropertySetFunction(bool atomic,
1325 bool copy) override;
1326 llvm::Constant *GetGetStructFunction() override;
1327 llvm::Constant *GetSetStructFunction() override;
1328 llvm::Constant *GetCppAtomicObjectGetFunction() override;
1329 llvm::Constant *GetCppAtomicObjectSetFunction() override;
1330 llvm::Constant *EnumerationMutationFunction() override;
1332 void EmitTryStmt(CodeGen::CodeGenFunction &CGF,
1333 const ObjCAtTryStmt &S) override;
1334 void EmitSynchronizedStmt(CodeGen::CodeGenFunction &CGF,
1335 const ObjCAtSynchronizedStmt &S) override;
1336 void EmitTryOrSynchronizedStmt(CodeGen::CodeGenFunction &CGF, const Stmt &S);
1337 void EmitThrowStmt(CodeGen::CodeGenFunction &CGF, const ObjCAtThrowStmt &S,
1338 bool ClearInsertionPoint=true) override;
1339 llvm::Value * EmitObjCWeakRead(CodeGen::CodeGenFunction &CGF,
1340 Address AddrWeakObj) override;
1341 void EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF,
1342 llvm::Value *src, Address dst) override;
1343 void EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF,
1344 llvm::Value *src, Address dest,
1345 bool threadlocal = false) override;
1346 void EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF,
1347 llvm::Value *src, Address dest,
1348 llvm::Value *ivarOffset) override;
1349 void EmitObjCStrongCastAssign(CodeGen::CodeGenFunction &CGF,
1350 llvm::Value *src, Address dest) override;
1351 void EmitGCMemmoveCollectable(CodeGen::CodeGenFunction &CGF,
1352 Address dest, Address src,
1353 llvm::Value *size) override;
1355 LValue EmitObjCValueForIvar(CodeGen::CodeGenFunction &CGF, QualType ObjectTy,
1356 llvm::Value *BaseValue, const ObjCIvarDecl *Ivar,
1357 unsigned CVRQualifiers) override;
1358 llvm::Value *EmitIvarOffset(CodeGen::CodeGenFunction &CGF,
1359 const ObjCInterfaceDecl *Interface,
1360 const ObjCIvarDecl *Ivar) override;
1363 class CGObjCNonFragileABIMac : public CGObjCCommonMac {
1365 friend ProtocolMethodLists;
1366 ObjCNonFragileABITypesHelper ObjCTypes;
1367 llvm::GlobalVariable* ObjCEmptyCacheVar;
1368 llvm::Constant* ObjCEmptyVtableVar;
1370 /// SuperClassReferences - uniqued super class references.
1371 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> SuperClassReferences;
1373 /// MetaClassReferences - uniqued meta class references.
1374 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> MetaClassReferences;
1376 /// EHTypeReferences - uniqued class ehtype references.
1377 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> EHTypeReferences;
1379 /// VTableDispatchMethods - List of methods for which we generate
1380 /// vtable-based message dispatch.
1381 llvm::DenseSet<Selector> VTableDispatchMethods;
1383 /// DefinedMetaClasses - List of defined meta-classes.
1384 std::vector<llvm::GlobalValue*> DefinedMetaClasses;
1386 /// isVTableDispatchedSelector - Returns true if SEL is a
1387 /// vtable-based selector.
1388 bool isVTableDispatchedSelector(Selector Sel);
1390 /// FinishNonFragileABIModule - Write out global data structures at the end of
1391 /// processing a translation unit.
1392 void FinishNonFragileABIModule();
1394 /// AddModuleClassList - Add the given list of class pointers to the
1395 /// module with the provided symbol and section names.
1396 void AddModuleClassList(ArrayRef<llvm::GlobalValue *> Container,
1397 StringRef SymbolName, StringRef SectionName);
1399 llvm::GlobalVariable * BuildClassRoTInitializer(unsigned flags,
1400 unsigned InstanceStart,
1401 unsigned InstanceSize,
1402 const ObjCImplementationDecl *ID);
1403 llvm::GlobalVariable *BuildClassObject(const ObjCInterfaceDecl *CI,
1405 llvm::Constant *IsAGV,
1406 llvm::Constant *SuperClassGV,
1407 llvm::Constant *ClassRoGV,
1408 bool HiddenVisibility);
1410 void emitMethodConstant(ConstantArrayBuilder &builder,
1411 const ObjCMethodDecl *MD,
1414 /// Emit the method list for the given implementation. The return value
1415 /// has type MethodListnfABITy.
1416 llvm::Constant *emitMethodList(Twine Name, MethodListType MLT,
1417 ArrayRef<const ObjCMethodDecl *> Methods);
1419 /// EmitIvarList - Emit the ivar list for the given
1420 /// implementation. If ForClass is true the list of class ivars
1421 /// (i.e. metaclass ivars) is emitted, otherwise the list of
1422 /// interface ivars will be emitted. The return value has type
1423 /// IvarListnfABIPtrTy.
1424 llvm::Constant *EmitIvarList(const ObjCImplementationDecl *ID);
1426 llvm::Constant *EmitIvarOffsetVar(const ObjCInterfaceDecl *ID,
1427 const ObjCIvarDecl *Ivar,
1428 unsigned long int offset);
1430 /// GetOrEmitProtocol - Get the protocol object for the given
1431 /// declaration, emitting it if necessary. The return value has type
1433 llvm::Constant *GetOrEmitProtocol(const ObjCProtocolDecl *PD) override;
1435 /// GetOrEmitProtocolRef - Get a forward reference to the protocol
1436 /// object for the given declaration, emitting it if needed. These
1437 /// forward references will be filled in with empty bodies if no
1438 /// definition is seen. The return value has type ProtocolPtrTy.
1439 llvm::Constant *GetOrEmitProtocolRef(const ObjCProtocolDecl *PD) override;
1441 /// EmitProtocolList - Generate the list of referenced
1442 /// protocols. The return value has type ProtocolListPtrTy.
1443 llvm::Constant *EmitProtocolList(Twine Name,
1444 ObjCProtocolDecl::protocol_iterator begin,
1445 ObjCProtocolDecl::protocol_iterator end);
1447 CodeGen::RValue EmitVTableMessageSend(CodeGen::CodeGenFunction &CGF,
1448 ReturnValueSlot Return,
1449 QualType ResultType,
1451 llvm::Value *Receiver,
1454 const CallArgList &CallArgs,
1455 const ObjCMethodDecl *Method);
1457 /// GetClassGlobal - Return the global variable for the Objective-C
1458 /// class of the given name.
1459 llvm::Constant *GetClassGlobal(StringRef Name,
1460 ForDefinition_t IsForDefinition,
1461 bool Weak = false, bool DLLImport = false);
1462 llvm::Constant *GetClassGlobal(const ObjCInterfaceDecl *ID,
1464 ForDefinition_t isForDefinition);
1466 /// EmitClassRef - Return a Value*, of type ObjCTypes.ClassPtrTy,
1467 /// for the given class reference.
1468 llvm::Value *EmitClassRef(CodeGenFunction &CGF,
1469 const ObjCInterfaceDecl *ID);
1471 llvm::Value *EmitClassRefFromId(CodeGenFunction &CGF,
1473 const ObjCInterfaceDecl *ID);
1475 llvm::Value *EmitNSAutoreleasePoolClassRef(CodeGenFunction &CGF) override;
1477 /// EmitSuperClassRef - Return a Value*, of type ObjCTypes.ClassPtrTy,
1478 /// for the given super class reference.
1479 llvm::Value *EmitSuperClassRef(CodeGenFunction &CGF,
1480 const ObjCInterfaceDecl *ID);
1482 /// EmitMetaClassRef - Return a Value * of the address of _class_t
1484 llvm::Value *EmitMetaClassRef(CodeGenFunction &CGF,
1485 const ObjCInterfaceDecl *ID, bool Weak);
1487 /// ObjCIvarOffsetVariable - Returns the ivar offset variable for
1490 llvm::GlobalVariable * ObjCIvarOffsetVariable(
1491 const ObjCInterfaceDecl *ID,
1492 const ObjCIvarDecl *Ivar);
1494 /// EmitSelector - Return a Value*, of type ObjCTypes.SelectorPtrTy,
1495 /// for the given selector.
1496 llvm::Value *EmitSelector(CodeGenFunction &CGF, Selector Sel);
1497 Address EmitSelectorAddr(CodeGenFunction &CGF, Selector Sel);
1499 /// GetInterfaceEHType - Get the cached ehtype for the given Objective-C
1500 /// interface. The return value has type EHTypePtrTy.
1501 llvm::Constant *GetInterfaceEHType(const ObjCInterfaceDecl *ID,
1502 ForDefinition_t IsForDefinition);
1504 StringRef getMetaclassSymbolPrefix() const { return "OBJC_METACLASS_$_"; }
1506 StringRef getClassSymbolPrefix() const { return "OBJC_CLASS_$_"; }
1508 void GetClassSizeInfo(const ObjCImplementationDecl *OID,
1509 uint32_t &InstanceStart,
1510 uint32_t &InstanceSize);
1512 // Shamelessly stolen from Analysis/CFRefCount.cpp
1513 Selector GetNullarySelector(const char* name) const {
1514 IdentifierInfo* II = &CGM.getContext().Idents.get(name);
1515 return CGM.getContext().Selectors.getSelector(0, &II);
1518 Selector GetUnarySelector(const char* name) const {
1519 IdentifierInfo* II = &CGM.getContext().Idents.get(name);
1520 return CGM.getContext().Selectors.getSelector(1, &II);
1523 /// ImplementationIsNonLazy - Check whether the given category or
1524 /// class implementation is "non-lazy".
1525 bool ImplementationIsNonLazy(const ObjCImplDecl *OD) const;
1527 bool IsIvarOffsetKnownIdempotent(const CodeGen::CodeGenFunction &CGF,
1528 const ObjCIvarDecl *IV) {
1529 // Annotate the load as an invariant load iff inside an instance method
1530 // and ivar belongs to instance method's class and one of its super class.
1531 // This check is needed because the ivar offset is a lazily
1532 // initialised value that may depend on objc_msgSend to perform a fixup on
1533 // the first message dispatch.
1535 // An additional opportunity to mark the load as invariant arises when the
1536 // base of the ivar access is a parameter to an Objective C method.
1537 // However, because the parameters are not available in the current
1538 // interface, we cannot perform this check.
1539 if (const ObjCMethodDecl *MD =
1540 dyn_cast_or_null<ObjCMethodDecl>(CGF.CurFuncDecl))
1541 if (MD->isInstanceMethod())
1542 if (const ObjCInterfaceDecl *ID = MD->getClassInterface())
1543 return IV->getContainingInterface()->isSuperClassOf(ID);
1548 CGObjCNonFragileABIMac(CodeGen::CodeGenModule &cgm);
1550 llvm::Constant *getNSConstantStringClassRef() override;
1552 llvm::Function *ModuleInitFunction() override;
1554 CodeGen::RValue GenerateMessageSend(CodeGen::CodeGenFunction &CGF,
1555 ReturnValueSlot Return,
1556 QualType ResultType, Selector Sel,
1557 llvm::Value *Receiver,
1558 const CallArgList &CallArgs,
1559 const ObjCInterfaceDecl *Class,
1560 const ObjCMethodDecl *Method) override;
1563 GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF,
1564 ReturnValueSlot Return, QualType ResultType,
1565 Selector Sel, const ObjCInterfaceDecl *Class,
1566 bool isCategoryImpl, llvm::Value *Receiver,
1567 bool IsClassMessage, const CallArgList &CallArgs,
1568 const ObjCMethodDecl *Method) override;
1570 llvm::Value *GetClass(CodeGenFunction &CGF,
1571 const ObjCInterfaceDecl *ID) override;
1573 llvm::Value *GetSelector(CodeGenFunction &CGF, Selector Sel) override
1574 { return EmitSelector(CGF, Sel); }
1575 Address GetAddrOfSelector(CodeGenFunction &CGF, Selector Sel) override
1576 { return EmitSelectorAddr(CGF, Sel); }
1578 /// The NeXT/Apple runtimes do not support typed selectors; just emit an
1580 llvm::Value *GetSelector(CodeGenFunction &CGF,
1581 const ObjCMethodDecl *Method) override
1582 { return EmitSelector(CGF, Method->getSelector()); }
1584 void GenerateCategory(const ObjCCategoryImplDecl *CMD) override;
1586 void GenerateClass(const ObjCImplementationDecl *ClassDecl) override;
1588 void RegisterAlias(const ObjCCompatibleAliasDecl *OAD) override {}
1590 llvm::Value *GenerateProtocolRef(CodeGenFunction &CGF,
1591 const ObjCProtocolDecl *PD) override;
1593 llvm::Constant *GetEHType(QualType T) override;
1595 llvm::Constant *GetPropertyGetFunction() override {
1596 return ObjCTypes.getGetPropertyFn();
1598 llvm::Constant *GetPropertySetFunction() override {
1599 return ObjCTypes.getSetPropertyFn();
1602 llvm::Constant *GetOptimizedPropertySetFunction(bool atomic,
1603 bool copy) override {
1604 return ObjCTypes.getOptimizedSetPropertyFn(atomic, copy);
1607 llvm::Constant *GetSetStructFunction() override {
1608 return ObjCTypes.getCopyStructFn();
1611 llvm::Constant *GetGetStructFunction() override {
1612 return ObjCTypes.getCopyStructFn();
1615 llvm::Constant *GetCppAtomicObjectSetFunction() override {
1616 return ObjCTypes.getCppAtomicObjectFunction();
1619 llvm::Constant *GetCppAtomicObjectGetFunction() override {
1620 return ObjCTypes.getCppAtomicObjectFunction();
1623 llvm::Constant *EnumerationMutationFunction() override {
1624 return ObjCTypes.getEnumerationMutationFn();
1627 void EmitTryStmt(CodeGen::CodeGenFunction &CGF,
1628 const ObjCAtTryStmt &S) override;
1629 void EmitSynchronizedStmt(CodeGen::CodeGenFunction &CGF,
1630 const ObjCAtSynchronizedStmt &S) override;
1631 void EmitThrowStmt(CodeGen::CodeGenFunction &CGF, const ObjCAtThrowStmt &S,
1632 bool ClearInsertionPoint=true) override;
1633 llvm::Value * EmitObjCWeakRead(CodeGen::CodeGenFunction &CGF,
1634 Address AddrWeakObj) override;
1635 void EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF,
1636 llvm::Value *src, Address edst) override;
1637 void EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF,
1638 llvm::Value *src, Address dest,
1639 bool threadlocal = false) override;
1640 void EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF,
1641 llvm::Value *src, Address dest,
1642 llvm::Value *ivarOffset) override;
1643 void EmitObjCStrongCastAssign(CodeGen::CodeGenFunction &CGF,
1644 llvm::Value *src, Address dest) override;
1645 void EmitGCMemmoveCollectable(CodeGen::CodeGenFunction &CGF,
1646 Address dest, Address src,
1647 llvm::Value *size) override;
1648 LValue EmitObjCValueForIvar(CodeGen::CodeGenFunction &CGF, QualType ObjectTy,
1649 llvm::Value *BaseValue, const ObjCIvarDecl *Ivar,
1650 unsigned CVRQualifiers) override;
1651 llvm::Value *EmitIvarOffset(CodeGen::CodeGenFunction &CGF,
1652 const ObjCInterfaceDecl *Interface,
1653 const ObjCIvarDecl *Ivar) override;
1656 /// A helper class for performing the null-initialization of a return
1658 struct NullReturnState {
1659 llvm::BasicBlock *NullBB;
1660 NullReturnState() : NullBB(nullptr) {}
1662 /// Perform a null-check of the given receiver.
1663 void init(CodeGenFunction &CGF, llvm::Value *receiver) {
1664 // Make blocks for the null-receiver and call edges.
1665 NullBB = CGF.createBasicBlock("msgSend.null-receiver");
1666 llvm::BasicBlock *callBB = CGF.createBasicBlock("msgSend.call");
1668 // Check for a null receiver and, if there is one, jump to the
1669 // null-receiver block. There's no point in trying to avoid it:
1670 // we're always going to put *something* there, because otherwise
1671 // we shouldn't have done this null-check in the first place.
1672 llvm::Value *isNull = CGF.Builder.CreateIsNull(receiver);
1673 CGF.Builder.CreateCondBr(isNull, NullBB, callBB);
1675 // Otherwise, start performing the call.
1676 CGF.EmitBlock(callBB);
1679 /// Complete the null-return operation. It is valid to call this
1680 /// regardless of whether 'init' has been called.
1681 RValue complete(CodeGenFunction &CGF,
1682 ReturnValueSlot returnSlot,
1684 QualType resultType,
1685 const CallArgList &CallArgs,
1686 const ObjCMethodDecl *Method) {
1687 // If we never had to do a null-check, just use the raw result.
1688 if (!NullBB) return result;
1690 // The continuation block. This will be left null if we don't have an
1691 // IP, which can happen if the method we're calling is marked noreturn.
1692 llvm::BasicBlock *contBB = nullptr;
1694 // Finish the call path.
1695 llvm::BasicBlock *callBB = CGF.Builder.GetInsertBlock();
1697 contBB = CGF.createBasicBlock("msgSend.cont");
1698 CGF.Builder.CreateBr(contBB);
1701 // Okay, start emitting the null-receiver block.
1702 CGF.EmitBlock(NullBB);
1704 // Release any consumed arguments we've got.
1706 CallArgList::const_iterator I = CallArgs.begin();
1707 for (ObjCMethodDecl::param_const_iterator i = Method->param_begin(),
1708 e = Method->param_end(); i != e; ++i, ++I) {
1709 const ParmVarDecl *ParamDecl = (*i);
1710 if (ParamDecl->hasAttr<NSConsumedAttr>()) {
1712 assert(RV.isScalar() &&
1713 "NullReturnState::complete - arg not on object");
1714 CGF.EmitARCRelease(RV.getScalarVal(), ARCImpreciseLifetime);
1719 // The phi code below assumes that we haven't needed any control flow yet.
1720 assert(CGF.Builder.GetInsertBlock() == NullBB);
1722 // If we've got a void return, just jump to the continuation block.
1723 if (result.isScalar() && resultType->isVoidType()) {
1724 // No jumps required if the message-send was noreturn.
1725 if (contBB) CGF.EmitBlock(contBB);
1729 // If we've got a scalar return, build a phi.
1730 if (result.isScalar()) {
1731 // Derive the null-initialization value.
1732 llvm::Constant *null = CGF.CGM.EmitNullConstant(resultType);
1734 // If no join is necessary, just flow out.
1735 if (!contBB) return RValue::get(null);
1737 // Otherwise, build a phi.
1738 CGF.EmitBlock(contBB);
1739 llvm::PHINode *phi = CGF.Builder.CreatePHI(null->getType(), 2);
1740 phi->addIncoming(result.getScalarVal(), callBB);
1741 phi->addIncoming(null, NullBB);
1742 return RValue::get(phi);
1745 // If we've got an aggregate return, null the buffer out.
1746 // FIXME: maybe we should be doing things differently for all the
1747 // cases where the ABI has us returning (1) non-agg values in
1748 // memory or (2) agg values in registers.
1749 if (result.isAggregate()) {
1750 assert(result.isAggregate() && "null init of non-aggregate result?");
1751 if (!returnSlot.isUnused())
1752 CGF.EmitNullInitialization(result.getAggregateAddress(), resultType);
1753 if (contBB) CGF.EmitBlock(contBB);
1758 CGF.EmitBlock(contBB);
1759 CodeGenFunction::ComplexPairTy callResult = result.getComplexVal();
1761 // Find the scalar type and its zero value.
1762 llvm::Type *scalarTy = callResult.first->getType();
1763 llvm::Constant *scalarZero = llvm::Constant::getNullValue(scalarTy);
1765 // Build phis for both coordinates.
1766 llvm::PHINode *real = CGF.Builder.CreatePHI(scalarTy, 2);
1767 real->addIncoming(callResult.first, callBB);
1768 real->addIncoming(scalarZero, NullBB);
1769 llvm::PHINode *imag = CGF.Builder.CreatePHI(scalarTy, 2);
1770 imag->addIncoming(callResult.second, callBB);
1771 imag->addIncoming(scalarZero, NullBB);
1772 return RValue::getComplex(real, imag);
1776 } // end anonymous namespace
1778 /* *** Helper Functions *** */
1780 /// getConstantGEP() - Help routine to construct simple GEPs.
1781 static llvm::Constant *getConstantGEP(llvm::LLVMContext &VMContext,
1782 llvm::GlobalVariable *C, unsigned idx0,
1784 llvm::Value *Idxs[] = {
1785 llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), idx0),
1786 llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), idx1)
1788 return llvm::ConstantExpr::getGetElementPtr(C->getValueType(), C, Idxs);
1791 /// hasObjCExceptionAttribute - Return true if this class or any super
1792 /// class has the __objc_exception__ attribute.
1793 static bool hasObjCExceptionAttribute(ASTContext &Context,
1794 const ObjCInterfaceDecl *OID) {
1795 if (OID->hasAttr<ObjCExceptionAttr>())
1797 if (const ObjCInterfaceDecl *Super = OID->getSuperClass())
1798 return hasObjCExceptionAttribute(Context, Super);
1802 /* *** CGObjCMac Public Interface *** */
1804 CGObjCMac::CGObjCMac(CodeGen::CodeGenModule &cgm) : CGObjCCommonMac(cgm),
1810 /// GetClass - Return a reference to the class for the given interface
1812 llvm::Value *CGObjCMac::GetClass(CodeGenFunction &CGF,
1813 const ObjCInterfaceDecl *ID) {
1814 return EmitClassRef(CGF, ID);
1817 /// GetSelector - Return the pointer to the unique'd string for this selector.
1818 llvm::Value *CGObjCMac::GetSelector(CodeGenFunction &CGF, Selector Sel) {
1819 return EmitSelector(CGF, Sel);
1821 Address CGObjCMac::GetAddrOfSelector(CodeGenFunction &CGF, Selector Sel) {
1822 return EmitSelectorAddr(CGF, Sel);
1824 llvm::Value *CGObjCMac::GetSelector(CodeGenFunction &CGF, const ObjCMethodDecl
1826 return EmitSelector(CGF, Method->getSelector());
1829 llvm::Constant *CGObjCMac::GetEHType(QualType T) {
1830 if (T->isObjCIdType() ||
1831 T->isObjCQualifiedIdType()) {
1832 return CGM.GetAddrOfRTTIDescriptor(
1833 CGM.getContext().getObjCIdRedefinitionType(), /*ForEH=*/true);
1835 if (T->isObjCClassType() ||
1836 T->isObjCQualifiedClassType()) {
1837 return CGM.GetAddrOfRTTIDescriptor(
1838 CGM.getContext().getObjCClassRedefinitionType(), /*ForEH=*/true);
1840 if (T->isObjCObjectPointerType())
1841 return CGM.GetAddrOfRTTIDescriptor(T, /*ForEH=*/true);
1843 llvm_unreachable("asking for catch type for ObjC type in fragile runtime");
1846 /// Generate a constant CFString object.
1848 struct __builtin_CFString {
1849 const int *isa; // point to __CFConstantStringClassReference
1856 /// or Generate a constant NSString object.
1858 struct __builtin_NSString {
1859 const int *isa; // point to __NSConstantStringClassReference
1861 unsigned int length;
1866 CGObjCCommonMac::GenerateConstantString(const StringLiteral *SL) {
1867 return (!CGM.getLangOpts().NoConstantCFStrings
1868 ? CGM.GetAddrOfConstantCFString(SL)
1869 : GenerateConstantNSString(SL));
1872 static llvm::StringMapEntry<llvm::GlobalVariable *> &
1873 GetConstantStringEntry(llvm::StringMap<llvm::GlobalVariable *> &Map,
1874 const StringLiteral *Literal, unsigned &StringLength) {
1875 StringRef String = Literal->getString();
1876 StringLength = String.size();
1877 return *Map.insert(std::make_pair(String, nullptr)).first;
1880 llvm::Constant *CGObjCMac::getNSConstantStringClassRef() {
1881 if (llvm::Value *V = ConstantStringClassRef)
1882 return cast<llvm::Constant>(V);
1884 auto &StringClass = CGM.getLangOpts().ObjCConstantStringClass;
1886 StringClass.empty() ? "_NSConstantStringClassReference"
1887 : "_" + StringClass + "ClassReference";
1889 llvm::Type *PTy = llvm::ArrayType::get(CGM.IntTy, 0);
1890 auto GV = CGM.CreateRuntimeVariable(PTy, str);
1891 auto V = llvm::ConstantExpr::getBitCast(GV, CGM.IntTy->getPointerTo());
1892 ConstantStringClassRef = V;
1896 llvm::Constant *CGObjCNonFragileABIMac::getNSConstantStringClassRef() {
1897 if (llvm::Value *V = ConstantStringClassRef)
1898 return cast<llvm::Constant>(V);
1900 auto &StringClass = CGM.getLangOpts().ObjCConstantStringClass;
1902 StringClass.empty() ? "OBJC_CLASS_$_NSConstantString"
1903 : "OBJC_CLASS_$_" + StringClass;
1904 auto GV = GetClassGlobal(str, NotForDefinition);
1906 // Make sure the result is of the correct type.
1907 auto V = llvm::ConstantExpr::getBitCast(GV, CGM.IntTy->getPointerTo());
1909 ConstantStringClassRef = V;
1914 CGObjCCommonMac::GenerateConstantNSString(const StringLiteral *Literal) {
1915 unsigned StringLength = 0;
1916 llvm::StringMapEntry<llvm::GlobalVariable *> &Entry =
1917 GetConstantStringEntry(NSConstantStringMap, Literal, StringLength);
1919 if (auto *C = Entry.second)
1920 return ConstantAddress(C, CharUnits::fromQuantity(C->getAlignment()));
1922 // If we don't already have it, get _NSConstantStringClassReference.
1923 llvm::Constant *Class = getNSConstantStringClassRef();
1925 // If we don't already have it, construct the type for a constant NSString.
1926 if (!NSConstantStringType) {
1927 NSConstantStringType =
1928 llvm::StructType::create({
1929 CGM.Int32Ty->getPointerTo(),
1932 }, "struct.__builtin_NSString");
1935 ConstantInitBuilder Builder(CGM);
1936 auto Fields = Builder.beginStruct(NSConstantStringType);
1943 llvm::ConstantDataArray::getString(VMContext, Entry.first());
1945 llvm::GlobalValue::LinkageTypes Linkage = llvm::GlobalValue::PrivateLinkage;
1946 bool isConstant = !CGM.getLangOpts().WritableStrings;
1948 auto *GV = new llvm::GlobalVariable(CGM.getModule(), C->getType(), isConstant,
1949 Linkage, C, ".str");
1950 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1951 // Don't enforce the target's minimum global alignment, since the only use
1952 // of the string is via this class initializer.
1953 GV->setAlignment(1);
1954 Fields.addBitCast(GV, CGM.Int8PtrTy);
1957 Fields.addInt(CGM.IntTy, StringLength);
1960 CharUnits Alignment = CGM.getPointerAlign();
1961 GV = Fields.finishAndCreateGlobal("_unnamed_nsstring_", Alignment,
1963 llvm::GlobalVariable::PrivateLinkage);
1964 const char *NSStringSection = "__OBJC,__cstring_object,regular,no_dead_strip";
1965 const char *NSStringNonFragileABISection =
1966 "__DATA,__objc_stringobj,regular,no_dead_strip";
1967 // FIXME. Fix section.
1968 GV->setSection(CGM.getLangOpts().ObjCRuntime.isNonFragile()
1969 ? NSStringNonFragileABISection
1973 return ConstantAddress(GV, Alignment);
1977 kCFTaggedObjectID_Integer = (1 << 1) + 1
1980 /// Generates a message send where the super is the receiver. This is
1981 /// a message send to self with special delivery semantics indicating
1982 /// which class's method should be called.
1984 CGObjCMac::GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF,
1985 ReturnValueSlot Return,
1986 QualType ResultType,
1988 const ObjCInterfaceDecl *Class,
1989 bool isCategoryImpl,
1990 llvm::Value *Receiver,
1991 bool IsClassMessage,
1992 const CodeGen::CallArgList &CallArgs,
1993 const ObjCMethodDecl *Method) {
1994 // Create and init a super structure; this is a (receiver, class)
1995 // pair we will pass to objc_msgSendSuper.
1997 CGF.CreateTempAlloca(ObjCTypes.SuperTy, CGF.getPointerAlign(),
1999 llvm::Value *ReceiverAsObject =
2000 CGF.Builder.CreateBitCast(Receiver, ObjCTypes.ObjectPtrTy);
2001 CGF.Builder.CreateStore(
2003 CGF.Builder.CreateStructGEP(ObjCSuper, 0, CharUnits::Zero()));
2005 // If this is a class message the metaclass is passed as the target.
2006 llvm::Value *Target;
2007 if (IsClassMessage) {
2008 if (isCategoryImpl) {
2009 // Message sent to 'super' in a class method defined in a category
2010 // implementation requires an odd treatment.
2011 // If we are in a class method, we must retrieve the
2012 // _metaclass_ for the current class, pointed at by
2013 // the class's "isa" pointer. The following assumes that
2014 // isa" is the first ivar in a class (which it must be).
2015 Target = EmitClassRef(CGF, Class->getSuperClass());
2016 Target = CGF.Builder.CreateStructGEP(ObjCTypes.ClassTy, Target, 0);
2017 Target = CGF.Builder.CreateAlignedLoad(Target, CGF.getPointerAlign());
2019 llvm::Constant *MetaClassPtr = EmitMetaClassRef(Class);
2020 llvm::Value *SuperPtr =
2021 CGF.Builder.CreateStructGEP(ObjCTypes.ClassTy, MetaClassPtr, 1);
2022 llvm::Value *Super =
2023 CGF.Builder.CreateAlignedLoad(SuperPtr, CGF.getPointerAlign());
2026 } else if (isCategoryImpl)
2027 Target = EmitClassRef(CGF, Class->getSuperClass());
2029 llvm::Value *ClassPtr = EmitSuperClassRef(Class);
2030 ClassPtr = CGF.Builder.CreateStructGEP(ObjCTypes.ClassTy, ClassPtr, 1);
2031 Target = CGF.Builder.CreateAlignedLoad(ClassPtr, CGF.getPointerAlign());
2033 // FIXME: We shouldn't need to do this cast, rectify the ASTContext and
2035 llvm::Type *ClassTy =
2036 CGM.getTypes().ConvertType(CGF.getContext().getObjCClassType());
2037 Target = CGF.Builder.CreateBitCast(Target, ClassTy);
2038 CGF.Builder.CreateStore(Target,
2039 CGF.Builder.CreateStructGEP(ObjCSuper, 1, CGF.getPointerSize()));
2040 return EmitMessageSend(CGF, Return, ResultType,
2041 EmitSelector(CGF, Sel),
2042 ObjCSuper.getPointer(), ObjCTypes.SuperPtrCTy,
2043 true, CallArgs, Method, Class, ObjCTypes);
2046 /// Generate code for a message send expression.
2047 CodeGen::RValue CGObjCMac::GenerateMessageSend(CodeGen::CodeGenFunction &CGF,
2048 ReturnValueSlot Return,
2049 QualType ResultType,
2051 llvm::Value *Receiver,
2052 const CallArgList &CallArgs,
2053 const ObjCInterfaceDecl *Class,
2054 const ObjCMethodDecl *Method) {
2055 return EmitMessageSend(CGF, Return, ResultType,
2056 EmitSelector(CGF, Sel),
2057 Receiver, CGF.getContext().getObjCIdType(),
2058 false, CallArgs, Method, Class, ObjCTypes);
2061 static bool isWeakLinkedClass(const ObjCInterfaceDecl *ID) {
2063 if (ID->isWeakImported())
2065 } while ((ID = ID->getSuperClass()));
2071 CGObjCCommonMac::EmitMessageSend(CodeGen::CodeGenFunction &CGF,
2072 ReturnValueSlot Return,
2073 QualType ResultType,
2078 const CallArgList &CallArgs,
2079 const ObjCMethodDecl *Method,
2080 const ObjCInterfaceDecl *ClassReceiver,
2081 const ObjCCommonTypesHelper &ObjCTypes) {
2082 CallArgList ActualArgs;
2084 Arg0 = CGF.Builder.CreateBitCast(Arg0, ObjCTypes.ObjectPtrTy);
2085 ActualArgs.add(RValue::get(Arg0), Arg0Ty);
2086 ActualArgs.add(RValue::get(Sel), CGF.getContext().getObjCSelType());
2087 ActualArgs.addFrom(CallArgs);
2089 // If we're calling a method, use the formal signature.
2090 MessageSendInfo MSI = getMessageSendInfo(Method, ResultType, ActualArgs);
2093 assert(CGM.getContext().getCanonicalType(Method->getReturnType()) ==
2094 CGM.getContext().getCanonicalType(ResultType) &&
2095 "Result type mismatch!");
2097 bool ReceiverCanBeNull = true;
2099 // Super dispatch assumes that self is non-null; even the messenger
2100 // doesn't have a null check internally.
2102 ReceiverCanBeNull = false;
2104 // If this is a direct dispatch of a class method, check whether the class,
2105 // or anything in its hierarchy, was weak-linked.
2106 } else if (ClassReceiver && Method && Method->isClassMethod()) {
2107 ReceiverCanBeNull = isWeakLinkedClass(ClassReceiver);
2109 // If we're emitting a method, and self is const (meaning just ARC, for now),
2110 // and the receiver is a load of self, then self is a valid object.
2111 } else if (auto CurMethod =
2112 dyn_cast_or_null<ObjCMethodDecl>(CGF.CurCodeDecl)) {
2113 auto Self = CurMethod->getSelfDecl();
2114 if (Self->getType().isConstQualified()) {
2115 if (auto LI = dyn_cast<llvm::LoadInst>(Arg0->stripPointerCasts())) {
2116 llvm::Value *SelfAddr = CGF.GetAddrOfLocalVar(Self).getPointer();
2117 if (SelfAddr == LI->getPointerOperand()) {
2118 ReceiverCanBeNull = false;
2124 bool RequiresNullCheck = false;
2126 llvm::Constant *Fn = nullptr;
2127 if (CGM.ReturnSlotInterferesWithArgs(MSI.CallInfo)) {
2128 if (ReceiverCanBeNull) RequiresNullCheck = true;
2129 Fn = (ObjCABI == 2) ? ObjCTypes.getSendStretFn2(IsSuper)
2130 : ObjCTypes.getSendStretFn(IsSuper);
2131 } else if (CGM.ReturnTypeUsesFPRet(ResultType)) {
2132 Fn = (ObjCABI == 2) ? ObjCTypes.getSendFpretFn2(IsSuper)
2133 : ObjCTypes.getSendFpretFn(IsSuper);
2134 } else if (CGM.ReturnTypeUsesFP2Ret(ResultType)) {
2135 Fn = (ObjCABI == 2) ? ObjCTypes.getSendFp2RetFn2(IsSuper)
2136 : ObjCTypes.getSendFp2retFn(IsSuper);
2138 // arm64 uses objc_msgSend for stret methods and yet null receiver check
2139 // must be made for it.
2140 if (ReceiverCanBeNull && CGM.ReturnTypeUsesSRet(MSI.CallInfo))
2141 RequiresNullCheck = true;
2142 Fn = (ObjCABI == 2) ? ObjCTypes.getSendFn2(IsSuper)
2143 : ObjCTypes.getSendFn(IsSuper);
2146 // We don't need to emit a null check to zero out an indirect result if the
2147 // result is ignored.
2148 if (Return.isUnused())
2149 RequiresNullCheck = false;
2151 // Emit a null-check if there's a consumed argument other than the receiver.
2152 if (!RequiresNullCheck && CGM.getLangOpts().ObjCAutoRefCount && Method) {
2153 for (const auto *ParamDecl : Method->parameters()) {
2154 if (ParamDecl->hasAttr<NSConsumedAttr>()) {
2155 RequiresNullCheck = true;
2161 NullReturnState nullReturn;
2162 if (RequiresNullCheck) {
2163 nullReturn.init(CGF, Arg0);
2166 llvm::Instruction *CallSite;
2167 Fn = llvm::ConstantExpr::getBitCast(Fn, MSI.MessengerType);
2168 CGCallee Callee = CGCallee::forDirect(Fn);
2169 RValue rvalue = CGF.EmitCall(MSI.CallInfo, Callee, Return, ActualArgs,
2172 // Mark the call as noreturn if the method is marked noreturn and the
2173 // receiver cannot be null.
2174 if (Method && Method->hasAttr<NoReturnAttr>() && !ReceiverCanBeNull) {
2175 llvm::CallSite(CallSite).setDoesNotReturn();
2178 return nullReturn.complete(CGF, Return, rvalue, ResultType, CallArgs,
2179 RequiresNullCheck ? Method : nullptr);
2182 static Qualifiers::GC GetGCAttrTypeForType(ASTContext &Ctx, QualType FQT,
2183 bool pointee = false) {
2184 // Note that GC qualification applies recursively to C pointer types
2185 // that aren't otherwise decorated. This is weird, but it's probably
2186 // an intentional workaround to the unreliable placement of GC qualifiers.
2187 if (FQT.isObjCGCStrong())
2188 return Qualifiers::Strong;
2190 if (FQT.isObjCGCWeak())
2191 return Qualifiers::Weak;
2193 if (auto ownership = FQT.getObjCLifetime()) {
2194 // Ownership does not apply recursively to C pointer types.
2195 if (pointee) return Qualifiers::GCNone;
2196 switch (ownership) {
2197 case Qualifiers::OCL_Weak: return Qualifiers::Weak;
2198 case Qualifiers::OCL_Strong: return Qualifiers::Strong;
2199 case Qualifiers::OCL_ExplicitNone: return Qualifiers::GCNone;
2200 case Qualifiers::OCL_Autoreleasing: llvm_unreachable("autoreleasing ivar?");
2201 case Qualifiers::OCL_None: llvm_unreachable("known nonzero");
2203 llvm_unreachable("bad objc ownership");
2206 // Treat unqualified retainable pointers as strong.
2207 if (FQT->isObjCObjectPointerType() || FQT->isBlockPointerType())
2208 return Qualifiers::Strong;
2210 // Walk into C pointer types, but only in GC.
2211 if (Ctx.getLangOpts().getGC() != LangOptions::NonGC) {
2212 if (const PointerType *PT = FQT->getAs<PointerType>())
2213 return GetGCAttrTypeForType(Ctx, PT->getPointeeType(), /*pointee*/ true);
2216 return Qualifiers::GCNone;
2222 uint64_t SizeInWords;
2223 IvarInfo(CharUnits offset, uint64_t sizeInWords)
2224 : Offset(offset), SizeInWords(sizeInWords) {}
2226 // Allow sorting based on byte pos.
2227 bool operator<(const IvarInfo &other) const {
2228 return Offset < other.Offset;
2232 /// A helper class for building GC layout strings.
2233 class IvarLayoutBuilder {
2236 /// The start of the layout. Offsets will be relative to this value,
2237 /// and entries less than this value will be silently discarded.
2238 CharUnits InstanceBegin;
2240 /// The end of the layout. Offsets will never exceed this value.
2241 CharUnits InstanceEnd;
2243 /// Whether we're generating the strong layout or the weak layout.
2244 bool ForStrongLayout;
2246 /// Whether the offsets in IvarsInfo might be out-of-order.
2247 bool IsDisordered = false;
2249 llvm::SmallVector<IvarInfo, 8> IvarsInfo;
2252 IvarLayoutBuilder(CodeGenModule &CGM, CharUnits instanceBegin,
2253 CharUnits instanceEnd, bool forStrongLayout)
2254 : CGM(CGM), InstanceBegin(instanceBegin), InstanceEnd(instanceEnd),
2255 ForStrongLayout(forStrongLayout) {
2258 void visitRecord(const RecordType *RT, CharUnits offset);
2260 template <class Iterator, class GetOffsetFn>
2261 void visitAggregate(Iterator begin, Iterator end,
2262 CharUnits aggrOffset,
2263 const GetOffsetFn &getOffset);
2265 void visitField(const FieldDecl *field, CharUnits offset);
2267 /// Add the layout of a block implementation.
2268 void visitBlock(const CGBlockInfo &blockInfo);
2270 /// Is there any information for an interesting bitmap?
2271 bool hasBitmapData() const { return !IvarsInfo.empty(); }
2273 llvm::Constant *buildBitmap(CGObjCCommonMac &CGObjC,
2274 llvm::SmallVectorImpl<unsigned char> &buffer);
2276 static void dump(ArrayRef<unsigned char> buffer) {
2277 const unsigned char *s = buffer.data();
2278 for (unsigned i = 0, e = buffer.size(); i < e; i++)
2280 printf("0x0%x%s", s[i], s[i] != 0 ? ", " : "");
2282 printf("0x%x%s", s[i], s[i] != 0 ? ", " : "");
2286 } // end anonymous namespace
2288 llvm::Constant *CGObjCCommonMac::BuildGCBlockLayout(CodeGenModule &CGM,
2289 const CGBlockInfo &blockInfo) {
2291 llvm::Constant *nullPtr = llvm::Constant::getNullValue(CGM.Int8PtrTy);
2292 if (CGM.getLangOpts().getGC() == LangOptions::NonGC)
2295 IvarLayoutBuilder builder(CGM, CharUnits::Zero(), blockInfo.BlockSize,
2296 /*for strong layout*/ true);
2298 builder.visitBlock(blockInfo);
2300 if (!builder.hasBitmapData())
2303 llvm::SmallVector<unsigned char, 32> buffer;
2304 llvm::Constant *C = builder.buildBitmap(*this, buffer);
2305 if (CGM.getLangOpts().ObjCGCBitmapPrint && !buffer.empty()) {
2306 printf("\n block variable layout for block: ");
2307 builder.dump(buffer);
2313 void IvarLayoutBuilder::visitBlock(const CGBlockInfo &blockInfo) {
2314 // __isa is the first field in block descriptor and must assume by runtime's
2315 // convention that it is GC'able.
2316 IvarsInfo.push_back(IvarInfo(CharUnits::Zero(), 1));
2318 const BlockDecl *blockDecl = blockInfo.getBlockDecl();
2320 // Ignore the optional 'this' capture: C++ objects are not assumed
2323 CharUnits lastFieldOffset;
2325 // Walk the captured variables.
2326 for (const auto &CI : blockDecl->captures()) {
2327 const VarDecl *variable = CI.getVariable();
2328 QualType type = variable->getType();
2330 const CGBlockInfo::Capture &capture = blockInfo.getCapture(variable);
2332 // Ignore constant captures.
2333 if (capture.isConstant()) continue;
2335 CharUnits fieldOffset = capture.getOffset();
2337 // Block fields are not necessarily ordered; if we detect that we're
2338 // adding them out-of-order, make sure we sort later.
2339 if (fieldOffset < lastFieldOffset)
2340 IsDisordered = true;
2341 lastFieldOffset = fieldOffset;
2343 // __block variables are passed by their descriptor address.
2345 IvarsInfo.push_back(IvarInfo(fieldOffset, /*size in words*/ 1));
2349 assert(!type->isArrayType() && "array variable should not be caught");
2350 if (const RecordType *record = type->getAs<RecordType>()) {
2351 visitRecord(record, fieldOffset);
2355 Qualifiers::GC GCAttr = GetGCAttrTypeForType(CGM.getContext(), type);
2357 if (GCAttr == Qualifiers::Strong) {
2358 assert(CGM.getContext().getTypeSize(type)
2359 == CGM.getTarget().getPointerWidth(0));
2360 IvarsInfo.push_back(IvarInfo(fieldOffset, /*size in words*/ 1));
2365 /// getBlockCaptureLifetime - This routine returns life time of the captured
2366 /// block variable for the purpose of block layout meta-data generation. FQT is
2367 /// the type of the variable captured in the block.
2368 Qualifiers::ObjCLifetime CGObjCCommonMac::getBlockCaptureLifetime(QualType FQT,
2370 // If it has an ownership qualifier, we're done.
2371 if (auto lifetime = FQT.getObjCLifetime())
2374 // If it doesn't, and this is ARC, it has no ownership.
2375 if (CGM.getLangOpts().ObjCAutoRefCount)
2376 return Qualifiers::OCL_None;
2378 // In MRC, retainable pointers are owned by non-__block variables.
2379 if (FQT->isObjCObjectPointerType() || FQT->isBlockPointerType())
2380 return ByrefLayout ? Qualifiers::OCL_ExplicitNone : Qualifiers::OCL_Strong;
2382 return Qualifiers::OCL_None;
2385 void CGObjCCommonMac::UpdateRunSkipBlockVars(bool IsByref,
2386 Qualifiers::ObjCLifetime LifeTime,
2387 CharUnits FieldOffset,
2388 CharUnits FieldSize) {
2389 // __block variables are passed by their descriptor address.
2391 RunSkipBlockVars.push_back(RUN_SKIP(BLOCK_LAYOUT_BYREF, FieldOffset,
2393 else if (LifeTime == Qualifiers::OCL_Strong)
2394 RunSkipBlockVars.push_back(RUN_SKIP(BLOCK_LAYOUT_STRONG, FieldOffset,
2396 else if (LifeTime == Qualifiers::OCL_Weak)
2397 RunSkipBlockVars.push_back(RUN_SKIP(BLOCK_LAYOUT_WEAK, FieldOffset,
2399 else if (LifeTime == Qualifiers::OCL_ExplicitNone)
2400 RunSkipBlockVars.push_back(RUN_SKIP(BLOCK_LAYOUT_UNRETAINED, FieldOffset,
2403 RunSkipBlockVars.push_back(RUN_SKIP(BLOCK_LAYOUT_NON_OBJECT_BYTES,
2408 void CGObjCCommonMac::BuildRCRecordLayout(const llvm::StructLayout *RecLayout,
2409 const RecordDecl *RD,
2410 ArrayRef<const FieldDecl*> RecFields,
2411 CharUnits BytePos, bool &HasUnion,
2413 bool IsUnion = (RD && RD->isUnion());
2414 CharUnits MaxUnionSize = CharUnits::Zero();
2415 const FieldDecl *MaxField = nullptr;
2416 const FieldDecl *LastFieldBitfieldOrUnnamed = nullptr;
2417 CharUnits MaxFieldOffset = CharUnits::Zero();
2418 CharUnits LastBitfieldOrUnnamedOffset = CharUnits::Zero();
2420 if (RecFields.empty())
2422 unsigned ByteSizeInBits = CGM.getTarget().getCharWidth();
2424 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
2425 const FieldDecl *Field = RecFields[i];
2426 // Note that 'i' here is actually the field index inside RD of Field,
2427 // although this dependency is hidden.
2428 const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
2429 CharUnits FieldOffset =
2430 CGM.getContext().toCharUnitsFromBits(RL.getFieldOffset(i));
2432 // Skip over unnamed or bitfields
2433 if (!Field->getIdentifier() || Field->isBitField()) {
2434 LastFieldBitfieldOrUnnamed = Field;
2435 LastBitfieldOrUnnamedOffset = FieldOffset;
2439 LastFieldBitfieldOrUnnamed = nullptr;
2440 QualType FQT = Field->getType();
2441 if (FQT->isRecordType() || FQT->isUnionType()) {
2442 if (FQT->isUnionType())
2445 BuildRCBlockVarRecordLayout(FQT->getAs<RecordType>(),
2446 BytePos + FieldOffset, HasUnion);
2450 if (const ArrayType *Array = CGM.getContext().getAsArrayType(FQT)) {
2451 const ConstantArrayType *CArray =
2452 dyn_cast_or_null<ConstantArrayType>(Array);
2453 uint64_t ElCount = CArray->getSize().getZExtValue();
2454 assert(CArray && "only array with known element size is supported");
2455 FQT = CArray->getElementType();
2456 while (const ArrayType *Array = CGM.getContext().getAsArrayType(FQT)) {
2457 const ConstantArrayType *CArray =
2458 dyn_cast_or_null<ConstantArrayType>(Array);
2459 ElCount *= CArray->getSize().getZExtValue();
2460 FQT = CArray->getElementType();
2462 if (FQT->isRecordType() && ElCount) {
2463 int OldIndex = RunSkipBlockVars.size() - 1;
2464 const RecordType *RT = FQT->getAs<RecordType>();
2465 BuildRCBlockVarRecordLayout(RT, BytePos + FieldOffset,
2468 // Replicate layout information for each array element. Note that
2469 // one element is already done.
2471 for (int FirstIndex = RunSkipBlockVars.size() - 1 ;ElIx < ElCount; ElIx++) {
2472 CharUnits Size = CGM.getContext().getTypeSizeInChars(RT);
2473 for (int i = OldIndex+1; i <= FirstIndex; ++i)
2474 RunSkipBlockVars.push_back(
2475 RUN_SKIP(RunSkipBlockVars[i].opcode,
2476 RunSkipBlockVars[i].block_var_bytepos + Size*ElIx,
2477 RunSkipBlockVars[i].block_var_size));
2482 CharUnits FieldSize = CGM.getContext().getTypeSizeInChars(Field->getType());
2484 CharUnits UnionIvarSize = FieldSize;
2485 if (UnionIvarSize > MaxUnionSize) {
2486 MaxUnionSize = UnionIvarSize;
2488 MaxFieldOffset = FieldOffset;
2491 UpdateRunSkipBlockVars(false,
2492 getBlockCaptureLifetime(FQT, ByrefLayout),
2493 BytePos + FieldOffset,
2498 if (LastFieldBitfieldOrUnnamed) {
2499 if (LastFieldBitfieldOrUnnamed->isBitField()) {
2500 // Last field was a bitfield. Must update the info.
2501 uint64_t BitFieldSize
2502 = LastFieldBitfieldOrUnnamed->getBitWidthValue(CGM.getContext());
2503 unsigned UnsSize = (BitFieldSize / ByteSizeInBits) +
2504 ((BitFieldSize % ByteSizeInBits) != 0);
2505 CharUnits Size = CharUnits::fromQuantity(UnsSize);
2506 Size += LastBitfieldOrUnnamedOffset;
2507 UpdateRunSkipBlockVars(false,
2508 getBlockCaptureLifetime(LastFieldBitfieldOrUnnamed->getType(),
2510 BytePos + LastBitfieldOrUnnamedOffset,
2513 assert(!LastFieldBitfieldOrUnnamed->getIdentifier() &&"Expected unnamed");
2514 // Last field was unnamed. Must update skip info.
2516 = CGM.getContext().getTypeSizeInChars(LastFieldBitfieldOrUnnamed->getType());
2517 UpdateRunSkipBlockVars(false,
2518 getBlockCaptureLifetime(LastFieldBitfieldOrUnnamed->getType(),
2520 BytePos + LastBitfieldOrUnnamedOffset,
2526 UpdateRunSkipBlockVars(false,
2527 getBlockCaptureLifetime(MaxField->getType(), ByrefLayout),
2528 BytePos + MaxFieldOffset,
2532 void CGObjCCommonMac::BuildRCBlockVarRecordLayout(const RecordType *RT,
2536 const RecordDecl *RD = RT->getDecl();
2537 SmallVector<const FieldDecl*, 16> Fields(RD->fields());
2538 llvm::Type *Ty = CGM.getTypes().ConvertType(QualType(RT, 0));
2539 const llvm::StructLayout *RecLayout =
2540 CGM.getDataLayout().getStructLayout(cast<llvm::StructType>(Ty));
2542 BuildRCRecordLayout(RecLayout, RD, Fields, BytePos, HasUnion, ByrefLayout);
2545 /// InlineLayoutInstruction - This routine produce an inline instruction for the
2546 /// block variable layout if it can. If not, it returns 0. Rules are as follow:
2547 /// If ((uintptr_t) layout) < (1 << 12), the layout is inline. In the 64bit world,
2548 /// an inline layout of value 0x0000000000000xyz is interpreted as follows:
2549 /// x captured object pointers of BLOCK_LAYOUT_STRONG. Followed by
2550 /// y captured object of BLOCK_LAYOUT_BYREF. Followed by
2551 /// z captured object of BLOCK_LAYOUT_WEAK. If any of the above is missing, zero
2552 /// replaces it. For example, 0x00000x00 means x BLOCK_LAYOUT_STRONG and no
2553 /// BLOCK_LAYOUT_BYREF and no BLOCK_LAYOUT_WEAK objects are captured.
2554 uint64_t CGObjCCommonMac::InlineLayoutInstruction(
2555 SmallVectorImpl<unsigned char> &Layout) {
2556 uint64_t Result = 0;
2557 if (Layout.size() <= 3) {
2558 unsigned size = Layout.size();
2559 unsigned strong_word_count = 0, byref_word_count=0, weak_word_count=0;
2561 enum BLOCK_LAYOUT_OPCODE opcode ;
2565 opcode = (enum BLOCK_LAYOUT_OPCODE) (inst >> 4);
2566 if (opcode == BLOCK_LAYOUT_STRONG)
2567 strong_word_count = (inst & 0xF)+1;
2571 opcode = (enum BLOCK_LAYOUT_OPCODE) (inst >> 4);
2572 if (opcode == BLOCK_LAYOUT_BYREF)
2573 byref_word_count = (inst & 0xF)+1;
2577 opcode = (enum BLOCK_LAYOUT_OPCODE) (inst >> 4);
2578 if (opcode == BLOCK_LAYOUT_WEAK)
2579 weak_word_count = (inst & 0xF)+1;
2586 opcode = (enum BLOCK_LAYOUT_OPCODE) (inst >> 4);
2587 if (opcode == BLOCK_LAYOUT_STRONG) {
2588 strong_word_count = (inst & 0xF)+1;
2590 opcode = (enum BLOCK_LAYOUT_OPCODE) (inst >> 4);
2591 if (opcode == BLOCK_LAYOUT_BYREF)
2592 byref_word_count = (inst & 0xF)+1;
2593 else if (opcode == BLOCK_LAYOUT_WEAK)
2594 weak_word_count = (inst & 0xF)+1;
2598 else if (opcode == BLOCK_LAYOUT_BYREF) {
2599 byref_word_count = (inst & 0xF)+1;
2601 opcode = (enum BLOCK_LAYOUT_OPCODE) (inst >> 4);
2602 if (opcode == BLOCK_LAYOUT_WEAK)
2603 weak_word_count = (inst & 0xF)+1;
2613 opcode = (enum BLOCK_LAYOUT_OPCODE) (inst >> 4);
2614 if (opcode == BLOCK_LAYOUT_STRONG)
2615 strong_word_count = (inst & 0xF)+1;
2616 else if (opcode == BLOCK_LAYOUT_BYREF)
2617 byref_word_count = (inst & 0xF)+1;
2618 else if (opcode == BLOCK_LAYOUT_WEAK)
2619 weak_word_count = (inst & 0xF)+1;
2628 // Cannot inline when any of the word counts is 15. Because this is one less
2629 // than the actual work count (so 15 means 16 actual word counts),
2630 // and we can only display 0 thru 15 word counts.
2631 if (strong_word_count == 16 || byref_word_count == 16 || weak_word_count == 16)
2635 (strong_word_count != 0) + (byref_word_count != 0) + (weak_word_count != 0);
2637 if (size == count) {
2638 if (strong_word_count)
2639 Result = strong_word_count;
2641 if (byref_word_count)
2642 Result += byref_word_count;
2644 if (weak_word_count)
2645 Result += weak_word_count;
2651 llvm::Constant *CGObjCCommonMac::getBitmapBlockLayout(bool ComputeByrefLayout) {
2652 llvm::Constant *nullPtr = llvm::Constant::getNullValue(CGM.Int8PtrTy);
2653 if (RunSkipBlockVars.empty())
2655 unsigned WordSizeInBits = CGM.getTarget().getPointerWidth(0);
2656 unsigned ByteSizeInBits = CGM.getTarget().getCharWidth();
2657 unsigned WordSizeInBytes = WordSizeInBits/ByteSizeInBits;
2659 // Sort on byte position; captures might not be allocated in order,
2660 // and unions can do funny things.
2661 llvm::array_pod_sort(RunSkipBlockVars.begin(), RunSkipBlockVars.end());
2662 SmallVector<unsigned char, 16> Layout;
2664 unsigned size = RunSkipBlockVars.size();
2665 for (unsigned i = 0; i < size; i++) {
2666 enum BLOCK_LAYOUT_OPCODE opcode = RunSkipBlockVars[i].opcode;
2667 CharUnits start_byte_pos = RunSkipBlockVars[i].block_var_bytepos;
2668 CharUnits end_byte_pos = start_byte_pos;
2671 if (opcode == RunSkipBlockVars[j].opcode) {
2672 end_byte_pos = RunSkipBlockVars[j++].block_var_bytepos;
2678 CharUnits size_in_bytes =
2679 end_byte_pos - start_byte_pos + RunSkipBlockVars[j-1].block_var_size;
2682 RunSkipBlockVars[j].block_var_bytepos -
2683 RunSkipBlockVars[j-1].block_var_bytepos - RunSkipBlockVars[j-1].block_var_size;
2684 size_in_bytes += gap;
2686 CharUnits residue_in_bytes = CharUnits::Zero();
2687 if (opcode == BLOCK_LAYOUT_NON_OBJECT_BYTES) {
2688 residue_in_bytes = size_in_bytes % WordSizeInBytes;
2689 size_in_bytes -= residue_in_bytes;
2690 opcode = BLOCK_LAYOUT_NON_OBJECT_WORDS;
2693 unsigned size_in_words = size_in_bytes.getQuantity() / WordSizeInBytes;
2694 while (size_in_words >= 16) {
2695 // Note that value in imm. is one less that the actual
2696 // value. So, 0xf means 16 words follow!
2697 unsigned char inst = (opcode << 4) | 0xf;
2698 Layout.push_back(inst);
2699 size_in_words -= 16;
2701 if (size_in_words > 0) {
2702 // Note that value in imm. is one less that the actual
2703 // value. So, we subtract 1 away!
2704 unsigned char inst = (opcode << 4) | (size_in_words-1);
2705 Layout.push_back(inst);
2707 if (residue_in_bytes > CharUnits::Zero()) {
2708 unsigned char inst =
2709 (BLOCK_LAYOUT_NON_OBJECT_BYTES << 4) | (residue_in_bytes.getQuantity()-1);
2710 Layout.push_back(inst);
2714 while (!Layout.empty()) {
2715 unsigned char inst = Layout.back();
2716 enum BLOCK_LAYOUT_OPCODE opcode = (enum BLOCK_LAYOUT_OPCODE) (inst >> 4);
2717 if (opcode == BLOCK_LAYOUT_NON_OBJECT_BYTES || opcode == BLOCK_LAYOUT_NON_OBJECT_WORDS)
2723 uint64_t Result = InlineLayoutInstruction(Layout);
2725 // Block variable layout instruction has been inlined.
2726 if (CGM.getLangOpts().ObjCGCBitmapPrint) {
2727 if (ComputeByrefLayout)
2728 printf("\n Inline BYREF variable layout: ");
2730 printf("\n Inline block variable layout: ");
2731 printf("0x0%" PRIx64 "", Result);
2732 if (auto numStrong = (Result & 0xF00) >> 8)
2733 printf(", BL_STRONG:%d", (int) numStrong);
2734 if (auto numByref = (Result & 0x0F0) >> 4)
2735 printf(", BL_BYREF:%d", (int) numByref);
2736 if (auto numWeak = (Result & 0x00F) >> 0)
2737 printf(", BL_WEAK:%d", (int) numWeak);
2738 printf(", BL_OPERATOR:0\n");
2740 return llvm::ConstantInt::get(CGM.IntPtrTy, Result);
2743 unsigned char inst = (BLOCK_LAYOUT_OPERATOR << 4) | 0;
2744 Layout.push_back(inst);
2746 for (unsigned i = 0, e = Layout.size(); i != e; i++)
2747 BitMap += Layout[i];
2749 if (CGM.getLangOpts().ObjCGCBitmapPrint) {
2750 if (ComputeByrefLayout)
2751 printf("\n Byref variable layout: ");
2753 printf("\n Block variable layout: ");
2754 for (unsigned i = 0, e = BitMap.size(); i != e; i++) {
2755 unsigned char inst = BitMap[i];
2756 enum BLOCK_LAYOUT_OPCODE opcode = (enum BLOCK_LAYOUT_OPCODE) (inst >> 4);
2759 case BLOCK_LAYOUT_OPERATOR:
2760 printf("BL_OPERATOR:");
2763 case BLOCK_LAYOUT_NON_OBJECT_BYTES:
2764 printf("BL_NON_OBJECT_BYTES:");
2766 case BLOCK_LAYOUT_NON_OBJECT_WORDS:
2767 printf("BL_NON_OBJECT_WORD:");
2769 case BLOCK_LAYOUT_STRONG:
2770 printf("BL_STRONG:");
2772 case BLOCK_LAYOUT_BYREF:
2773 printf("BL_BYREF:");
2775 case BLOCK_LAYOUT_WEAK:
2778 case BLOCK_LAYOUT_UNRETAINED:
2779 printf("BL_UNRETAINED:");
2782 // Actual value of word count is one more that what is in the imm.
2783 // field of the instruction
2784 printf("%d", (inst & 0xf) + delta);
2792 auto *Entry = CreateCStringLiteral(BitMap, ObjCLabelType::ClassName,
2793 /*ForceNonFragileABI=*/true,
2794 /*NullTerminate=*/false);
2795 return getConstantGEP(VMContext, Entry, 0, 0);
2798 llvm::Constant *CGObjCCommonMac::BuildRCBlockLayout(CodeGenModule &CGM,
2799 const CGBlockInfo &blockInfo) {
2800 assert(CGM.getLangOpts().getGC() == LangOptions::NonGC);
2802 RunSkipBlockVars.clear();
2803 bool hasUnion = false;
2805 unsigned WordSizeInBits = CGM.getTarget().getPointerWidth(0);
2806 unsigned ByteSizeInBits = CGM.getTarget().getCharWidth();
2807 unsigned WordSizeInBytes = WordSizeInBits/ByteSizeInBits;
2809 const BlockDecl *blockDecl = blockInfo.getBlockDecl();
2811 // Calculate the basic layout of the block structure.
2812 const llvm::StructLayout *layout =
2813 CGM.getDataLayout().getStructLayout(blockInfo.StructureType);
2815 // Ignore the optional 'this' capture: C++ objects are not assumed
2817 if (blockInfo.BlockHeaderForcedGapSize != CharUnits::Zero())
2818 UpdateRunSkipBlockVars(false, Qualifiers::OCL_None,
2819 blockInfo.BlockHeaderForcedGapOffset,
2820 blockInfo.BlockHeaderForcedGapSize);
2821 // Walk the captured variables.
2822 for (const auto &CI : blockDecl->captures()) {
2823 const VarDecl *variable = CI.getVariable();
2824 QualType type = variable->getType();
2826 const CGBlockInfo::Capture &capture = blockInfo.getCapture(variable);
2828 // Ignore constant captures.
2829 if (capture.isConstant()) continue;
2831 CharUnits fieldOffset =
2832 CharUnits::fromQuantity(layout->getElementOffset(capture.getIndex()));
2834 assert(!type->isArrayType() && "array variable should not be caught");
2836 if (const RecordType *record = type->getAs<RecordType>()) {
2837 BuildRCBlockVarRecordLayout(record, fieldOffset, hasUnion);
2840 CharUnits fieldSize;
2842 fieldSize = CharUnits::fromQuantity(WordSizeInBytes);
2844 fieldSize = CGM.getContext().getTypeSizeInChars(type);
2845 UpdateRunSkipBlockVars(CI.isByRef(), getBlockCaptureLifetime(type, false),
2846 fieldOffset, fieldSize);
2848 return getBitmapBlockLayout(false);
2851 llvm::Constant *CGObjCCommonMac::BuildByrefLayout(CodeGen::CodeGenModule &CGM,
2853 assert(CGM.getLangOpts().getGC() == LangOptions::NonGC);
2854 assert(!T->isArrayType() && "__block array variable should not be caught");
2855 CharUnits fieldOffset;
2856 RunSkipBlockVars.clear();
2857 bool hasUnion = false;
2858 if (const RecordType *record = T->getAs<RecordType>()) {
2859 BuildRCBlockVarRecordLayout(record, fieldOffset, hasUnion, true /*ByrefLayout */);
2860 llvm::Constant *Result = getBitmapBlockLayout(true);
2861 if (isa<llvm::ConstantInt>(Result))
2862 Result = llvm::ConstantExpr::getIntToPtr(Result, CGM.Int8PtrTy);
2865 llvm::Constant *nullPtr = llvm::Constant::getNullValue(CGM.Int8PtrTy);
2869 llvm::Value *CGObjCMac::GenerateProtocolRef(CodeGenFunction &CGF,
2870 const ObjCProtocolDecl *PD) {
2871 // FIXME: I don't understand why gcc generates this, or where it is
2872 // resolved. Investigate. Its also wasteful to look this up over and over.
2873 LazySymbols.insert(&CGM.getContext().Idents.get("Protocol"));
2875 return llvm::ConstantExpr::getBitCast(GetProtocolRef(PD),
2876 ObjCTypes.getExternalProtocolPtrTy());
2879 void CGObjCCommonMac::GenerateProtocol(const ObjCProtocolDecl *PD) {
2880 // FIXME: We shouldn't need this, the protocol decl should contain enough
2881 // information to tell us whether this was a declaration or a definition.
2882 DefinedProtocols.insert(PD->getIdentifier());
2884 // If we have generated a forward reference to this protocol, emit
2885 // it now. Otherwise do nothing, the protocol objects are lazily
2887 if (Protocols.count(PD->getIdentifier()))
2888 GetOrEmitProtocol(PD);
2891 llvm::Constant *CGObjCCommonMac::GetProtocolRef(const ObjCProtocolDecl *PD) {
2892 if (DefinedProtocols.count(PD->getIdentifier()))
2893 return GetOrEmitProtocol(PD);
2895 return GetOrEmitProtocolRef(PD);
2898 llvm::Value *CGObjCCommonMac::EmitClassRefViaRuntime(
2899 CodeGenFunction &CGF,
2900 const ObjCInterfaceDecl *ID,
2901 ObjCCommonTypesHelper &ObjCTypes) {
2902 llvm::Constant *lookUpClassFn = ObjCTypes.getLookUpClassFn();
2904 llvm::Value *className =
2905 CGF.CGM.GetAddrOfConstantCString(ID->getObjCRuntimeNameAsString())
2907 ASTContext &ctx = CGF.CGM.getContext();
2909 CGF.Builder.CreateBitCast(className,
2911 ctx.getPointerType(ctx.CharTy.withConst())));
2912 llvm::CallInst *call = CGF.Builder.CreateCall(lookUpClassFn, className);
2913 call->setDoesNotThrow();
2918 // Objective-C 1.0 extensions
2919 struct _objc_protocol {
2920 struct _objc_protocol_extension *isa;
2921 char *protocol_name;
2922 struct _objc_protocol_list *protocol_list;
2923 struct _objc__method_prototype_list *instance_methods;
2924 struct _objc__method_prototype_list *class_methods
2927 See EmitProtocolExtension().
2929 llvm::Constant *CGObjCMac::GetOrEmitProtocol(const ObjCProtocolDecl *PD) {
2930 llvm::GlobalVariable *Entry = Protocols[PD->getIdentifier()];
2932 // Early exit if a defining object has already been generated.
2933 if (Entry && Entry->hasInitializer())
2936 // Use the protocol definition, if there is one.
2937 if (const ObjCProtocolDecl *Def = PD->getDefinition())
2940 // FIXME: I don't understand why gcc generates this, or where it is
2941 // resolved. Investigate. Its also wasteful to look this up over and over.
2942 LazySymbols.insert(&CGM.getContext().Idents.get("Protocol"));
2944 // Construct method lists.
2945 auto methodLists = ProtocolMethodLists::get(PD);
2947 ConstantInitBuilder builder(CGM);
2948 auto values = builder.beginStruct(ObjCTypes.ProtocolTy);
2949 values.add(EmitProtocolExtension(PD, methodLists));
2950 values.add(GetClassName(PD->getObjCRuntimeNameAsString()));
2951 values.add(EmitProtocolList("OBJC_PROTOCOL_REFS_" + PD->getName(),
2952 PD->protocol_begin(), PD->protocol_end()));
2953 values.add(methodLists.emitMethodList(this, PD,
2954 ProtocolMethodLists::RequiredInstanceMethods));
2955 values.add(methodLists.emitMethodList(this, PD,
2956 ProtocolMethodLists::RequiredClassMethods));
2959 // Already created, update the initializer.
2960 assert(Entry->hasPrivateLinkage());
2961 values.finishAndSetAsInitializer(Entry);
2963 Entry = values.finishAndCreateGlobal("OBJC_PROTOCOL_" + PD->getName(),
2964 CGM.getPointerAlign(),
2966 llvm::GlobalValue::PrivateLinkage);
2967 Entry->setSection("__OBJC,__protocol,regular,no_dead_strip");
2969 Protocols[PD->getIdentifier()] = Entry;
2971 CGM.addCompilerUsedGlobal(Entry);
2976 llvm::Constant *CGObjCMac::GetOrEmitProtocolRef(const ObjCProtocolDecl *PD) {
2977 llvm::GlobalVariable *&Entry = Protocols[PD->getIdentifier()];
2980 // We use the initializer as a marker of whether this is a forward
2981 // reference or not. At module finalization we add the empty
2982 // contents for protocols which were referenced but never defined.
2983 Entry = new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.ProtocolTy,
2984 false, llvm::GlobalValue::PrivateLinkage,
2985 nullptr, "OBJC_PROTOCOL_" + PD->getName());
2986 Entry->setSection("__OBJC,__protocol,regular,no_dead_strip");
2987 // FIXME: Is this necessary? Why only for protocol?
2988 Entry->setAlignment(4);
2995 struct _objc_protocol_extension {
2997 struct objc_method_description_list *optional_instance_methods;
2998 struct objc_method_description_list *optional_class_methods;
2999 struct objc_property_list *instance_properties;
3000 const char ** extendedMethodTypes;
3001 struct objc_property_list *class_properties;
3005 CGObjCMac::EmitProtocolExtension(const ObjCProtocolDecl *PD,
3006 const ProtocolMethodLists &methodLists) {
3007 auto optInstanceMethods =
3008 methodLists.emitMethodList(this, PD,
3009 ProtocolMethodLists::OptionalInstanceMethods);
3010 auto optClassMethods =
3011 methodLists.emitMethodList(this, PD,
3012 ProtocolMethodLists::OptionalClassMethods);
3014 auto extendedMethodTypes =
3015 EmitProtocolMethodTypes("OBJC_PROTOCOL_METHOD_TYPES_" + PD->getName(),
3016 methodLists.emitExtendedTypesArray(this),
3019 auto instanceProperties =
3020 EmitPropertyList("OBJC_$_PROP_PROTO_LIST_" + PD->getName(), nullptr, PD,
3022 auto classProperties =
3023 EmitPropertyList("OBJC_$_CLASS_PROP_PROTO_LIST_" + PD->getName(), nullptr,
3024 PD, ObjCTypes, true);
3026 // Return null if no extension bits are used.
3027 if (optInstanceMethods->isNullValue() &&
3028 optClassMethods->isNullValue() &&
3029 extendedMethodTypes->isNullValue() &&
3030 instanceProperties->isNullValue() &&
3031 classProperties->isNullValue()) {
3032 return llvm::Constant::getNullValue(ObjCTypes.ProtocolExtensionPtrTy);
3036 CGM.getDataLayout().getTypeAllocSize(ObjCTypes.ProtocolExtensionTy);
3038 ConstantInitBuilder builder(CGM);
3039 auto values = builder.beginStruct(ObjCTypes.ProtocolExtensionTy);
3040 values.addInt(ObjCTypes.IntTy, size);
3041 values.add(optInstanceMethods);
3042 values.add(optClassMethods);
3043 values.add(instanceProperties);
3044 values.add(extendedMethodTypes);
3045 values.add(classProperties);
3047 // No special section, but goes in llvm.used
3048 return CreateMetadataVar("\01l_OBJC_PROTOCOLEXT_" + PD->getName(), values,
3049 StringRef(), CGM.getPointerAlign(), true);
3053 struct objc_protocol_list {
3054 struct objc_protocol_list *next;
3060 CGObjCMac::EmitProtocolList(Twine name,
3061 ObjCProtocolDecl::protocol_iterator begin,
3062 ObjCProtocolDecl::protocol_iterator end) {
3063 // Just return null for empty protocol lists
3065 return llvm::Constant::getNullValue(ObjCTypes.ProtocolListPtrTy);
3067 ConstantInitBuilder builder(CGM);
3068 auto values = builder.beginStruct();
3070 // This field is only used by the runtime.
3071 values.addNullPointer(ObjCTypes.ProtocolListPtrTy);
3073 // Reserve a slot for the count.
3074 auto countSlot = values.addPlaceholder();
3076 auto refsArray = values.beginArray(ObjCTypes.ProtocolPtrTy);
3077 for (; begin != end; ++begin) {
3078 refsArray.add(GetProtocolRef(*begin));
3080 auto count = refsArray.size();
3082 // This list is null terminated.
3083 refsArray.addNullPointer(ObjCTypes.ProtocolPtrTy);
3085 refsArray.finishAndAddTo(values);
3086 values.fillPlaceholderWithInt(countSlot, ObjCTypes.LongTy, count);
3089 if (CGM.getTriple().isOSBinFormatMachO())
3090 section = "__OBJC,__cat_cls_meth,regular,no_dead_strip";
3092 llvm::GlobalVariable *GV =
3093 CreateMetadataVar(name, values, section, CGM.getPointerAlign(), false);
3094 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.ProtocolListPtrTy);
3098 PushProtocolProperties(llvm::SmallPtrSet<const IdentifierInfo*,16> &PropertySet,
3099 SmallVectorImpl<const ObjCPropertyDecl *> &Properties,
3100 const ObjCProtocolDecl *Proto,
3101 bool IsClassProperty) {
3102 for (const auto *P : Proto->protocols())
3103 PushProtocolProperties(PropertySet, Properties, P, IsClassProperty);
3105 for (const auto *PD : Proto->properties()) {
3106 if (IsClassProperty != PD->isClassProperty())
3108 if (!PropertySet.insert(PD->getIdentifier()).second)
3110 Properties.push_back(PD);
3115 struct _objc_property {
3116 const char * const name;
3117 const char * const attributes;
3120 struct _objc_property_list {
3121 uint32_t entsize; // sizeof (struct _objc_property)
3122 uint32_t prop_count;
3123 struct _objc_property[prop_count];
3126 llvm::Constant *CGObjCCommonMac::EmitPropertyList(Twine Name,
3127 const Decl *Container,
3128 const ObjCContainerDecl *OCD,
3129 const ObjCCommonTypesHelper &ObjCTypes,
3130 bool IsClassProperty) {
3131 if (IsClassProperty) {
3132 // Make this entry NULL for OS X with deployment target < 10.11, for iOS
3133 // with deployment target < 9.0.
3134 const llvm::Triple &Triple = CGM.getTarget().getTriple();
3135 if ((Triple.isMacOSX() && Triple.isMacOSXVersionLT(10, 11)) ||
3136 (Triple.isiOS() && Triple.isOSVersionLT(9)))
3137 return llvm::Constant::getNullValue(ObjCTypes.PropertyListPtrTy);
3140 SmallVector<const ObjCPropertyDecl *, 16> Properties;
3141 llvm::SmallPtrSet<const IdentifierInfo*, 16> PropertySet;
3143 if (const ObjCInterfaceDecl *OID = dyn_cast<ObjCInterfaceDecl>(OCD))
3144 for (const ObjCCategoryDecl *ClassExt : OID->known_extensions())
3145 for (auto *PD : ClassExt->properties()) {
3146 if (IsClassProperty != PD->isClassProperty())
3148 PropertySet.insert(PD->getIdentifier());
3149 Properties.push_back(PD);
3152 for (const auto *PD : OCD->properties()) {
3153 if (IsClassProperty != PD->isClassProperty())
3155 // Don't emit duplicate metadata for properties that were already in a
3157 if (!PropertySet.insert(PD->getIdentifier()).second)
3159 Properties.push_back(PD);
3162 if (const ObjCInterfaceDecl *OID = dyn_cast<ObjCInterfaceDecl>(OCD)) {
3163 for (const auto *P : OID->all_referenced_protocols())
3164 PushProtocolProperties(PropertySet, Properties, P, IsClassProperty);
3166 else if (const ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(OCD)) {
3167 for (const auto *P : CD->protocols())
3168 PushProtocolProperties(PropertySet, Properties, P, IsClassProperty);
3171 // Return null for empty list.
3172 if (Properties.empty())
3173 return llvm::Constant::getNullValue(ObjCTypes.PropertyListPtrTy);
3175 unsigned propertySize =
3176 CGM.getDataLayout().getTypeAllocSize(ObjCTypes.PropertyTy);
3178 ConstantInitBuilder builder(CGM);
3179 auto values = builder.beginStruct();
3180 values.addInt(ObjCTypes.IntTy, propertySize);
3181 values.addInt(ObjCTypes.IntTy, Properties.size());
3182 auto propertiesArray = values.beginArray(ObjCTypes.PropertyTy);
3183 for (auto PD : Properties) {
3184 auto property = propertiesArray.beginStruct(ObjCTypes.PropertyTy);
3185 property.add(GetPropertyName(PD->getIdentifier()));
3186 property.add(GetPropertyTypeString(PD, Container));
3187 property.finishAndAddTo(propertiesArray);
3189 propertiesArray.finishAndAddTo(values);
3192 if (CGM.getTriple().isOSBinFormatMachO())
3193 Section = (ObjCABI == 2) ? "__DATA, __objc_const"
3194 : "__OBJC,__property,regular,no_dead_strip";
3196 llvm::GlobalVariable *GV =
3197 CreateMetadataVar(Name, values, Section, CGM.getPointerAlign(), true);
3198 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.PropertyListPtrTy);
3202 CGObjCCommonMac::EmitProtocolMethodTypes(Twine Name,
3203 ArrayRef<llvm::Constant*> MethodTypes,
3204 const ObjCCommonTypesHelper &ObjCTypes) {
3205 // Return null for empty list.
3206 if (MethodTypes.empty())
3207 return llvm::Constant::getNullValue(ObjCTypes.Int8PtrPtrTy);
3209 llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.Int8PtrTy,
3210 MethodTypes.size());
3211 llvm::Constant *Init = llvm::ConstantArray::get(AT, MethodTypes);
3214 if (CGM.getTriple().isOSBinFormatMachO() && ObjCABI == 2)
3215 Section = "__DATA, __objc_const";
3217 llvm::GlobalVariable *GV =
3218 CreateMetadataVar(Name, Init, Section, CGM.getPointerAlign(), true);
3219 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.Int8PtrPtrTy);
3223 struct _objc_category {
3224 char *category_name;
3226 struct _objc_method_list *instance_methods;
3227 struct _objc_method_list *class_methods;
3228 struct _objc_protocol_list *protocols;
3229 uint32_t size; // <rdar://4585769>
3230 struct _objc_property_list *instance_properties;
3231 struct _objc_property_list *class_properties;
3234 void CGObjCMac::GenerateCategory(const ObjCCategoryImplDecl *OCD) {
3235 unsigned Size = CGM.getDataLayout().getTypeAllocSize(ObjCTypes.CategoryTy);
3237 // FIXME: This is poor design, the OCD should have a pointer to the category
3238 // decl. Additionally, note that Category can be null for the @implementation
3239 // w/o an @interface case. Sema should just create one for us as it does for
3240 // @implementation so everyone else can live life under a clear blue sky.
3241 const ObjCInterfaceDecl *Interface = OCD->getClassInterface();
3242 const ObjCCategoryDecl *Category =
3243 Interface->FindCategoryDeclaration(OCD->getIdentifier());
3245 SmallString<256> ExtName;
3246 llvm::raw_svector_ostream(ExtName) << Interface->getName() << '_'
3249 ConstantInitBuilder Builder(CGM);
3250 auto Values = Builder.beginStruct(ObjCTypes.CategoryTy);
3257 SmallVector<const ObjCMethodDecl *, 16> Methods[NumMethodLists];
3258 for (const auto *MD : OCD->methods()) {
3259 Methods[unsigned(MD->isClassMethod())].push_back(MD);
3262 Values.add(GetClassName(OCD->getName()));
3263 Values.add(GetClassName(Interface->getObjCRuntimeNameAsString()));
3264 LazySymbols.insert(Interface->getIdentifier());
3266 Values.add(emitMethodList(ExtName, MethodListType::CategoryInstanceMethods,
3267 Methods[InstanceMethods]));
3268 Values.add(emitMethodList(ExtName, MethodListType::CategoryClassMethods,
3269 Methods[ClassMethods]));
3272 EmitProtocolList("OBJC_CATEGORY_PROTOCOLS_" + ExtName.str(),
3273 Category->protocol_begin(), Category->protocol_end()));
3275 Values.addNullPointer(ObjCTypes.ProtocolListPtrTy);
3277 Values.addInt(ObjCTypes.IntTy, Size);
3279 // If there is no category @interface then there can be no properties.
3281 Values.add(EmitPropertyList("\01l_OBJC_$_PROP_LIST_" + ExtName.str(),
3282 OCD, Category, ObjCTypes, false));
3283 Values.add(EmitPropertyList("\01l_OBJC_$_CLASS_PROP_LIST_" + ExtName.str(),
3284 OCD, Category, ObjCTypes, true));
3286 Values.addNullPointer(ObjCTypes.PropertyListPtrTy);
3287 Values.addNullPointer(ObjCTypes.PropertyListPtrTy);
3290 llvm::GlobalVariable *GV =
3291 CreateMetadataVar("OBJC_CATEGORY_" + ExtName.str(), Values,
3292 "__OBJC,__category,regular,no_dead_strip",
3293 CGM.getPointerAlign(), true);
3294 DefinedCategories.push_back(GV);
3295 DefinedCategoryNames.insert(llvm::CachedHashString(ExtName));
3296 // method definition entries must be clear for next implementation.
3297 MethodDefinitions.clear();
3300 enum FragileClassFlags {
3301 /// Apparently: is not a meta-class.
3302 FragileABI_Class_Factory = 0x00001,
3304 /// Is a meta-class.
3305 FragileABI_Class_Meta = 0x00002,
3307 /// Has a non-trivial constructor or destructor.
3308 FragileABI_Class_HasCXXStructors = 0x02000,
3310 /// Has hidden visibility.
3311 FragileABI_Class_Hidden = 0x20000,
3313 /// Class implementation was compiled under ARC.
3314 FragileABI_Class_CompiledByARC = 0x04000000,
3316 /// Class implementation was compiled under MRC and has MRC weak ivars.
3317 /// Exclusive with CompiledByARC.
3318 FragileABI_Class_HasMRCWeakIvars = 0x08000000,
3321 enum NonFragileClassFlags {
3322 /// Is a meta-class.
3323 NonFragileABI_Class_Meta = 0x00001,
3325 /// Is a root class.
3326 NonFragileABI_Class_Root = 0x00002,
3328 /// Has a non-trivial constructor or destructor.
3329 NonFragileABI_Class_HasCXXStructors = 0x00004,
3331 /// Has hidden visibility.
3332 NonFragileABI_Class_Hidden = 0x00010,
3334 /// Has the exception attribute.
3335 NonFragileABI_Class_Exception = 0x00020,
3337 /// (Obsolete) ARC-specific: this class has a .release_ivars method
3338 NonFragileABI_Class_HasIvarReleaser = 0x00040,
3340 /// Class implementation was compiled under ARC.
3341 NonFragileABI_Class_CompiledByARC = 0x00080,
3343 /// Class has non-trivial destructors, but zero-initialization is okay.
3344 NonFragileABI_Class_HasCXXDestructorOnly = 0x00100,
3346 /// Class implementation was compiled under MRC and has MRC weak ivars.
3347 /// Exclusive with CompiledByARC.
3348 NonFragileABI_Class_HasMRCWeakIvars = 0x00200,
3351 static bool hasWeakMember(QualType type) {
3352 if (type.getObjCLifetime() == Qualifiers::OCL_Weak) {
3356 if (auto recType = type->getAs<RecordType>()) {
3357 for (auto field : recType->getDecl()->fields()) {
3358 if (hasWeakMember(field->getType()))
3366 /// For compatibility, we only want to set the "HasMRCWeakIvars" flag
3367 /// (and actually fill in a layout string) if we really do have any
3369 static bool hasMRCWeakIvars(CodeGenModule &CGM,
3370 const ObjCImplementationDecl *ID) {
3371 if (!CGM.getLangOpts().ObjCWeak) return false;
3372 assert(CGM.getLangOpts().getGC() == LangOptions::NonGC);
3374 for (const ObjCIvarDecl *ivar =
3375 ID->getClassInterface()->all_declared_ivar_begin();
3376 ivar; ivar = ivar->getNextIvar()) {
3377 if (hasWeakMember(ivar->getType()))
3385 struct _objc_class {
3392 struct _objc_ivar_list *ivars;
3393 struct _objc_method_list *methods;
3394 struct _objc_cache *cache;
3395 struct _objc_protocol_list *protocols;
3396 // Objective-C 1.0 extensions (<rdr://4585769>)
3397 const char *ivar_layout;
3398 struct _objc_class_ext *ext;
3401 See EmitClassExtension();
3403 void CGObjCMac::GenerateClass(const ObjCImplementationDecl *ID) {
3404 DefinedSymbols.insert(ID->getIdentifier());
3406 std::string ClassName = ID->getNameAsString();
3408 ObjCInterfaceDecl *Interface =
3409 const_cast<ObjCInterfaceDecl*>(ID->getClassInterface());
3410 llvm::Constant *Protocols =
3411 EmitProtocolList("OBJC_CLASS_PROTOCOLS_" + ID->getName(),
3412 Interface->all_referenced_protocol_begin(),
3413 Interface->all_referenced_protocol_end());
3414 unsigned Flags = FragileABI_Class_Factory;
3415 if (ID->hasNonZeroConstructors() || ID->hasDestructors())
3416 Flags |= FragileABI_Class_HasCXXStructors;
3418 bool hasMRCWeak = false;
3420 if (CGM.getLangOpts().ObjCAutoRefCount)
3421 Flags |= FragileABI_Class_CompiledByARC;
3422 else if ((hasMRCWeak = hasMRCWeakIvars(CGM, ID)))
3423 Flags |= FragileABI_Class_HasMRCWeakIvars;
3426 CGM.getContext().getASTObjCImplementationLayout(ID).getSize();
3428 // FIXME: Set CXX-structors flag.
3429 if (ID->getClassInterface()->getVisibility() == HiddenVisibility)
3430 Flags |= FragileABI_Class_Hidden;
3437 SmallVector<const ObjCMethodDecl *, 16> Methods[NumMethodLists];
3438 for (const auto *MD : ID->methods()) {
3439 Methods[unsigned(MD->isClassMethod())].push_back(MD);
3442 for (const auto *PID : ID->property_impls()) {
3443 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) {
3444 ObjCPropertyDecl *PD = PID->getPropertyDecl();
3446 if (ObjCMethodDecl *MD = PD->getGetterMethodDecl())
3447 if (GetMethodDefinition(MD))
3448 Methods[InstanceMethods].push_back(MD);
3449 if (ObjCMethodDecl *MD = PD->getSetterMethodDecl())
3450 if (GetMethodDefinition(MD))
3451 Methods[InstanceMethods].push_back(MD);
3455 ConstantInitBuilder builder(CGM);
3456 auto values = builder.beginStruct(ObjCTypes.ClassTy);
3457 values.add(EmitMetaClass(ID, Protocols, Methods[ClassMethods]));
3458 if (ObjCInterfaceDecl *Super = Interface->getSuperClass()) {
3459 // Record a reference to the super class.
3460 LazySymbols.insert(Super->getIdentifier());
3462 values.addBitCast(GetClassName(Super->getObjCRuntimeNameAsString()),
3463 ObjCTypes.ClassPtrTy);
3465 values.addNullPointer(ObjCTypes.ClassPtrTy);
3467 values.add(GetClassName(ID->getObjCRuntimeNameAsString()));
3468 // Version is always 0.
3469 values.addInt(ObjCTypes.LongTy, 0);
3470 values.addInt(ObjCTypes.LongTy, Flags);
3471 values.addInt(ObjCTypes.LongTy, Size.getQuantity());
3472 values.add(EmitIvarList(ID, false));
3473 values.add(emitMethodList(ID->getName(), MethodListType::InstanceMethods,
3474 Methods[InstanceMethods]));
3475 // cache is always NULL.
3476 values.addNullPointer(ObjCTypes.CachePtrTy);
3477 values.add(Protocols);
3478 values.add(BuildStrongIvarLayout(ID, CharUnits::Zero(), Size));
3479 values.add(EmitClassExtension(ID, Size, hasMRCWeak,
3480 /*isMetaclass*/ false));
3482 std::string Name("OBJC_CLASS_");
3484 const char *Section = "__OBJC,__class,regular,no_dead_strip";
3485 // Check for a forward reference.
3486 llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name, true);
3488 assert(GV->getType()->getElementType() == ObjCTypes.ClassTy &&
3489 "Forward metaclass reference has incorrect type.");
3490 values.finishAndSetAsInitializer(GV);
3491 GV->setSection(Section);
3492 GV->setAlignment(CGM.getPointerAlign().getQuantity());
3493 CGM.addCompilerUsedGlobal(GV);
3495 GV = CreateMetadataVar(Name, values, Section, CGM.getPointerAlign(), true);
3496 DefinedClasses.push_back(GV);
3497 ImplementedClasses.push_back(Interface);
3498 // method definition entries must be clear for next implementation.
3499 MethodDefinitions.clear();
3502 llvm::Constant *CGObjCMac::EmitMetaClass(const ObjCImplementationDecl *ID,
3503 llvm::Constant *Protocols,
3504 ArrayRef<const ObjCMethodDecl*> Methods) {
3505 unsigned Flags = FragileABI_Class_Meta;
3506 unsigned Size = CGM.getDataLayout().getTypeAllocSize(ObjCTypes.ClassTy);
3508 if (ID->getClassInterface()->getVisibility() == HiddenVisibility)
3509 Flags |= FragileABI_Class_Hidden;
3511 ConstantInitBuilder builder(CGM);
3512 auto values = builder.beginStruct(ObjCTypes.ClassTy);
3513 // The isa for the metaclass is the root of the hierarchy.
3514 const ObjCInterfaceDecl *Root = ID->getClassInterface();
3515 while (const ObjCInterfaceDecl *Super = Root->getSuperClass())
3517 values.addBitCast(GetClassName(Root->getObjCRuntimeNameAsString()),
3518 ObjCTypes.ClassPtrTy);
3519 // The super class for the metaclass is emitted as the name of the
3520 // super class. The runtime fixes this up to point to the
3521 // *metaclass* for the super class.
3522 if (ObjCInterfaceDecl *Super = ID->getClassInterface()->getSuperClass()) {
3523 values.addBitCast(GetClassName(Super->getObjCRuntimeNameAsString()),
3524 ObjCTypes.ClassPtrTy);
3526 values.addNullPointer(ObjCTypes.ClassPtrTy);
3528 values.add(GetClassName(ID->getObjCRuntimeNameAsString()));
3529 // Version is always 0.
3530 values.addInt(ObjCTypes.LongTy, 0);
3531 values.addInt(ObjCTypes.LongTy, Flags);
3532 values.addInt(ObjCTypes.LongTy, Size);
3533 values.add(EmitIvarList(ID, true));
3534 values.add(emitMethodList(ID->getName(), MethodListType::ClassMethods,
3536 // cache is always NULL.
3537 values.addNullPointer(ObjCTypes.CachePtrTy);
3538 values.add(Protocols);
3539 // ivar_layout for metaclass is always NULL.
3540 values.addNullPointer(ObjCTypes.Int8PtrTy);
3541 // The class extension is used to store class properties for metaclasses.
3542 values.add(EmitClassExtension(ID, CharUnits::Zero(), false/*hasMRCWeak*/,
3543 /*isMetaclass*/true));
3545 std::string Name("OBJC_METACLASS_");
3546 Name += ID->getName();
3548 // Check for a forward reference.
3549 llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name, true);
3551 assert(GV->getType()->getElementType() == ObjCTypes.ClassTy &&
3552 "Forward metaclass reference has incorrect type.");
3553 values.finishAndSetAsInitializer(GV);
3555 GV = values.finishAndCreateGlobal(Name, CGM.getPointerAlign(),
3557 llvm::GlobalValue::PrivateLinkage);
3559 GV->setSection("__OBJC,__meta_class,regular,no_dead_strip");
3560 CGM.addCompilerUsedGlobal(GV);
3565 llvm::Constant *CGObjCMac::EmitMetaClassRef(const ObjCInterfaceDecl *ID) {
3566 std::string Name = "OBJC_METACLASS_" + ID->getNameAsString();
3568 // FIXME: Should we look these up somewhere other than the module. Its a bit
3569 // silly since we only generate these while processing an implementation, so
3570 // exactly one pointer would work if know when we entered/exitted an
3571 // implementation block.
3573 // Check for an existing forward reference.
3574 // Previously, metaclass with internal linkage may have been defined.
3575 // pass 'true' as 2nd argument so it is returned.
3576 llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name, true);
3578 GV = new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.ClassTy, false,
3579 llvm::GlobalValue::PrivateLinkage, nullptr,
3582 assert(GV->getType()->getElementType() == ObjCTypes.ClassTy &&
3583 "Forward metaclass reference has incorrect type.");
3587 llvm::Value *CGObjCMac::EmitSuperClassRef(const ObjCInterfaceDecl *ID) {
3588 std::string Name = "OBJC_CLASS_" + ID->getNameAsString();
3589 llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name, true);
3592 GV = new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.ClassTy, false,
3593 llvm::GlobalValue::PrivateLinkage, nullptr,
3596 assert(GV->getType()->getElementType() == ObjCTypes.ClassTy &&
3597 "Forward class metadata reference has incorrect type.");
3602 Emit a "class extension", which in this specific context means extra
3603 data that doesn't fit in the normal fragile-ABI class structure, and
3604 has nothing to do with the language concept of a class extension.
3606 struct objc_class_ext {
3608 const char *weak_ivar_layout;
3609 struct _objc_property_list *properties;
3613 CGObjCMac::EmitClassExtension(const ObjCImplementationDecl *ID,
3614 CharUnits InstanceSize, bool hasMRCWeakIvars,
3616 // Weak ivar layout.
3617 llvm::Constant *layout;
3619 layout = llvm::ConstantPointerNull::get(CGM.Int8PtrTy);
3621 layout = BuildWeakIvarLayout(ID, CharUnits::Zero(), InstanceSize,
3626 llvm::Constant *propertyList =
3627 EmitPropertyList((isMetaclass ? Twine("\01l_OBJC_$_CLASS_PROP_LIST_")
3628 : Twine("\01l_OBJC_$_PROP_LIST_"))
3630 ID, ID->getClassInterface(), ObjCTypes, isMetaclass);
3632 // Return null if no extension bits are used.
3633 if (layout->isNullValue() && propertyList->isNullValue()) {
3634 return llvm::Constant::getNullValue(ObjCTypes.ClassExtensionPtrTy);
3638 CGM.getDataLayout().getTypeAllocSize(ObjCTypes.ClassExtensionTy);
3640 ConstantInitBuilder builder(CGM);
3641 auto values = builder.beginStruct(ObjCTypes.ClassExtensionTy);
3642 values.addInt(ObjCTypes.IntTy, size);
3644 values.add(propertyList);
3646 return CreateMetadataVar("OBJC_CLASSEXT_" + ID->getName(), values,
3647 "__OBJC,__class_ext,regular,no_dead_strip",
3648 CGM.getPointerAlign(), true);
3658 struct objc_ivar_list {
3660 struct objc_ivar list[count];
3663 llvm::Constant *CGObjCMac::EmitIvarList(const ObjCImplementationDecl *ID,
3665 // When emitting the root class GCC emits ivar entries for the
3666 // actual class structure. It is not clear if we need to follow this
3667 // behavior; for now lets try and get away with not doing it. If so,
3668 // the cleanest solution would be to make up an ObjCInterfaceDecl
3671 return llvm::Constant::getNullValue(ObjCTypes.IvarListPtrTy);
3673 const ObjCInterfaceDecl *OID = ID->getClassInterface();
3675 ConstantInitBuilder builder(CGM);
3676 auto ivarList = builder.beginStruct();
3677 auto countSlot = ivarList.addPlaceholder();
3678 auto ivars = ivarList.beginArray(ObjCTypes.IvarTy);
3680 for (const ObjCIvarDecl *IVD = OID->all_declared_ivar_begin();
3681 IVD; IVD = IVD->getNextIvar()) {
3682 // Ignore unnamed bit-fields.
3683 if (!IVD->getDeclName())
3686 auto ivar = ivars.beginStruct(ObjCTypes.IvarTy);
3687 ivar.add(GetMethodVarName(IVD->getIdentifier()));
3688 ivar.add(GetMethodVarType(IVD));
3689 ivar.addInt(ObjCTypes.IntTy, ComputeIvarBaseOffset(CGM, OID, IVD));
3690 ivar.finishAndAddTo(ivars);
3693 // Return null for empty list.
3694 auto count = ivars.size();
3698 return llvm::Constant::getNullValue(ObjCTypes.IvarListPtrTy);
3701 ivars.finishAndAddTo(ivarList);
3702 ivarList.fillPlaceholderWithInt(countSlot, ObjCTypes.IntTy, count);
3704 llvm::GlobalVariable *GV;
3707 CreateMetadataVar("OBJC_CLASS_VARIABLES_" + ID->getName(), ivarList,
3708 "__OBJC,__class_vars,regular,no_dead_strip",
3709 CGM.getPointerAlign(), true);
3711 GV = CreateMetadataVar("OBJC_INSTANCE_VARIABLES_" + ID->getName(), ivarList,
3712 "__OBJC,__instance_vars,regular,no_dead_strip",
3713 CGM.getPointerAlign(), true);
3714 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.IvarListPtrTy);
3717 /// Build a struct objc_method_description constant for the given method.
3719 /// struct objc_method_description {
3720 /// SEL method_name;
3721 /// char *method_types;
3723 void CGObjCMac::emitMethodDescriptionConstant(ConstantArrayBuilder &builder,
3724 const ObjCMethodDecl *MD) {
3725 auto description = builder.beginStruct(ObjCTypes.MethodDescriptionTy);
3726 description.addBitCast(GetMethodVarName(MD->getSelector()),
3727 ObjCTypes.SelectorPtrTy);
3728 description.add(GetMethodVarType(MD));
3729 description.finishAndAddTo(builder);
3732 /// Build a struct objc_method constant for the given method.
3734 /// struct objc_method {
3735 /// SEL method_name;
3736 /// char *method_types;
3739 void CGObjCMac::emitMethodConstant(ConstantArrayBuilder &builder,
3740 const ObjCMethodDecl *MD) {
3741 llvm::Function *fn = GetMethodDefinition(MD);
3742 assert(fn && "no definition registered for method");
3744 auto method = builder.beginStruct(ObjCTypes.MethodTy);
3745 method.addBitCast(GetMethodVarName(MD->getSelector()),
3746 ObjCTypes.SelectorPtrTy);
3747 method.add(GetMethodVarType(MD));
3748 method.addBitCast(fn, ObjCTypes.Int8PtrTy);
3749 method.finishAndAddTo(builder);
3752 /// Build a struct objc_method_list or struct objc_method_description_list,
3755 /// struct objc_method_list {
3756 /// struct objc_method_list *obsolete;
3758 /// struct objc_method methods_list[count];
3761 /// struct objc_method_description_list {
3763 /// struct objc_method_description list[count];
3765 llvm::Constant *CGObjCMac::emitMethodList(Twine name, MethodListType MLT,
3766 ArrayRef<const ObjCMethodDecl *> methods) {
3769 bool forProtocol = false;
3771 case MethodListType::CategoryInstanceMethods:
3772 prefix = "OBJC_CATEGORY_INSTANCE_METHODS_";
3773 section = "__OBJC,__cat_inst_meth,regular,no_dead_strip";
3774 forProtocol = false;
3776 case MethodListType::CategoryClassMethods:
3777 prefix = "OBJC_CATEGORY_CLASS_METHODS_";
3778 section = "__OBJC,__cat_cls_meth,regular,no_dead_strip";
3779 forProtocol = false;
3781 case MethodListType::InstanceMethods:
3782 prefix = "OBJC_INSTANCE_METHODS_";
3783 section = "__OBJC,__inst_meth,regular,no_dead_strip";
3784 forProtocol = false;
3786 case MethodListType::ClassMethods:
3787 prefix = "OBJC_CLASS_METHODS_";
3788 section = "__OBJC,__cls_meth,regular,no_dead_strip";
3789 forProtocol = false;
3791 case MethodListType::ProtocolInstanceMethods:
3792 prefix = "OBJC_PROTOCOL_INSTANCE_METHODS_";
3793 section = "__OBJC,__cat_inst_meth,regular,no_dead_strip";
3796 case MethodListType::ProtocolClassMethods:
3797 prefix = "OBJC_PROTOCOL_CLASS_METHODS_";
3798 section = "__OBJC,__cat_cls_meth,regular,no_dead_strip";
3801 case MethodListType::OptionalProtocolInstanceMethods:
3802 prefix = "OBJC_PROTOCOL_INSTANCE_METHODS_OPT_";
3803 section = "__OBJC,__cat_inst_meth,regular,no_dead_strip";
3806 case MethodListType::OptionalProtocolClassMethods:
3807 prefix = "OBJC_PROTOCOL_CLASS_METHODS_OPT_";
3808 section = "__OBJC,__cat_cls_meth,regular,no_dead_strip";
3813 // Return null for empty list.
3814 if (methods.empty())
3815 return llvm::Constant::getNullValue(forProtocol
3816 ? ObjCTypes.MethodDescriptionListPtrTy
3817 : ObjCTypes.MethodListPtrTy);
3819 // For protocols, this is an objc_method_description_list, which has
3820 // a slightly different structure.
3822 ConstantInitBuilder builder(CGM);
3823 auto values = builder.beginStruct();
3824 values.addInt(ObjCTypes.IntTy, methods.size());
3825 auto methodArray = values.beginArray(ObjCTypes.MethodDescriptionTy);
3826 for (auto MD : methods) {
3827 emitMethodDescriptionConstant(methodArray, MD);
3829 methodArray.finishAndAddTo(values);
3831 llvm::GlobalVariable *GV = CreateMetadataVar(prefix + name, values, section,
3832 CGM.getPointerAlign(), true);
3833 return llvm::ConstantExpr::getBitCast(GV,
3834 ObjCTypes.MethodDescriptionListPtrTy);
3837 // Otherwise, it's an objc_method_list.
3838 ConstantInitBuilder builder(CGM);
3839 auto values = builder.beginStruct();
3840 values.addNullPointer(ObjCTypes.Int8PtrTy);
3841 values.addInt(ObjCTypes.IntTy, methods.size());
3842 auto methodArray = values.beginArray(ObjCTypes.MethodTy);
3843 for (auto MD : methods) {
3844 emitMethodConstant(methodArray, MD);
3846 methodArray.finishAndAddTo(values);
3848 llvm::GlobalVariable *GV = CreateMetadataVar(prefix + name, values, section,
3849 CGM.getPointerAlign(), true);
3850 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.MethodListPtrTy);
3853 llvm::Function *CGObjCCommonMac::GenerateMethod(const ObjCMethodDecl *OMD,
3854 const ObjCContainerDecl *CD) {
3855 SmallString<256> Name;
3856 GetNameForMethod(OMD, CD, Name);
3858 CodeGenTypes &Types = CGM.getTypes();
3859 llvm::FunctionType *MethodTy =
3860 Types.GetFunctionType(Types.arrangeObjCMethodDeclaration(OMD));
3861 llvm::Function *Method =
3862 llvm::Function::Create(MethodTy,
3863 llvm::GlobalValue::InternalLinkage,
3866 MethodDefinitions.insert(std::make_pair(OMD, Method));
3871 llvm::GlobalVariable *CGObjCCommonMac::CreateMetadataVar(Twine Name,
3872 ConstantStructBuilder &Init,
3876 llvm::GlobalVariable *GV =
3877 Init.finishAndCreateGlobal(Name, Align, /*constant*/ false,
3878 llvm::GlobalValue::PrivateLinkage);
3879 if (!Section.empty())
3880 GV->setSection(Section);
3882 CGM.addCompilerUsedGlobal(GV);
3886 llvm::GlobalVariable *CGObjCCommonMac::CreateMetadataVar(Twine Name,
3887 llvm::Constant *Init,
3891 llvm::Type *Ty = Init->getType();
3892 llvm::GlobalVariable *GV =
3893 new llvm::GlobalVariable(CGM.getModule(), Ty, false,
3894 llvm::GlobalValue::PrivateLinkage, Init, Name);
3895 if (!Section.empty())
3896 GV->setSection(Section);
3897 GV->setAlignment(Align.getQuantity());
3899 CGM.addCompilerUsedGlobal(GV);
3903 llvm::GlobalVariable *
3904 CGObjCCommonMac::CreateCStringLiteral(StringRef Name, ObjCLabelType Type,
3905 bool ForceNonFragileABI,
3906 bool NullTerminate) {
3909 case ObjCLabelType::ClassName: Label = "OBJC_CLASS_NAME_"; break;
3910 case ObjCLabelType::MethodVarName: Label = "OBJC_METH_VAR_NAME_"; break;
3911 case ObjCLabelType::MethodVarType: Label = "OBJC_METH_VAR_TYPE_"; break;
3912 case ObjCLabelType::PropertyName: Label = "OBJC_PROP_NAME_ATTR_"; break;
3915 bool NonFragile = ForceNonFragileABI || isNonFragileABI();
3919 case ObjCLabelType::ClassName:
3920 Section = NonFragile ? "__TEXT,__objc_classname,cstring_literals"
3921 : "__TEXT,__cstring,cstring_literals";
3923 case ObjCLabelType::MethodVarName:
3924 Section = NonFragile ? "__TEXT,__objc_methname,cstring_literals"
3925 : "__TEXT,__cstring,cstring_literals";
3927 case ObjCLabelType::MethodVarType:
3928 Section = NonFragile ? "__TEXT,__objc_methtype,cstring_literals"
3929 : "__TEXT,__cstring,cstring_literals";
3931 case ObjCLabelType::PropertyName:
3932 Section = "__TEXT,__cstring,cstring_literals";
3936 llvm::Constant *Value =
3937 llvm::ConstantDataArray::getString(VMContext, Name, NullTerminate);
3938 llvm::GlobalVariable *GV =
3939 new llvm::GlobalVariable(CGM.getModule(), Value->getType(),
3940 /*isConstant=*/true,
3941 llvm::GlobalValue::PrivateLinkage, Value, Label);
3942 if (CGM.getTriple().isOSBinFormatMachO())
3943 GV->setSection(Section);
3944 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
3945 GV->setAlignment(CharUnits::One().getQuantity());
3946 CGM.addCompilerUsedGlobal(GV);
3951 llvm::Function *CGObjCMac::ModuleInitFunction() {
3952 // Abuse this interface function as a place to finalize.
3957 llvm::Constant *CGObjCMac::GetPropertyGetFunction() {
3958 return ObjCTypes.getGetPropertyFn();
3961 llvm::Constant *CGObjCMac::GetPropertySetFunction() {
3962 return ObjCTypes.getSetPropertyFn();
3965 llvm::Constant *CGObjCMac::GetOptimizedPropertySetFunction(bool atomic,
3967 return ObjCTypes.getOptimizedSetPropertyFn(atomic, copy);
3970 llvm::Constant *CGObjCMac::GetGetStructFunction() {
3971 return ObjCTypes.getCopyStructFn();
3974 llvm::Constant *CGObjCMac::GetSetStructFunction() {
3975 return ObjCTypes.getCopyStructFn();
3978 llvm::Constant *CGObjCMac::GetCppAtomicObjectGetFunction() {
3979 return ObjCTypes.getCppAtomicObjectFunction();
3982 llvm::Constant *CGObjCMac::GetCppAtomicObjectSetFunction() {
3983 return ObjCTypes.getCppAtomicObjectFunction();
3986 llvm::Constant *CGObjCMac::EnumerationMutationFunction() {
3987 return ObjCTypes.getEnumerationMutationFn();
3990 void CGObjCMac::EmitTryStmt(CodeGenFunction &CGF, const ObjCAtTryStmt &S) {
3991 return EmitTryOrSynchronizedStmt(CGF, S);
3994 void CGObjCMac::EmitSynchronizedStmt(CodeGenFunction &CGF,
3995 const ObjCAtSynchronizedStmt &S) {
3996 return EmitTryOrSynchronizedStmt(CGF, S);
4000 struct PerformFragileFinally final : EHScopeStack::Cleanup {
4002 Address SyncArgSlot;
4003 Address CallTryExitVar;
4004 Address ExceptionData;
4005 ObjCTypesHelper &ObjCTypes;
4006 PerformFragileFinally(const Stmt *S,
4007 Address SyncArgSlot,
4008 Address CallTryExitVar,
4009 Address ExceptionData,
4010 ObjCTypesHelper *ObjCTypes)
4011 : S(*S), SyncArgSlot(SyncArgSlot), CallTryExitVar(CallTryExitVar),
4012 ExceptionData(ExceptionData), ObjCTypes(*ObjCTypes) {}
4014 void Emit(CodeGenFunction &CGF, Flags flags) override {
4015 // Check whether we need to call objc_exception_try_exit.
4016 // In optimized code, this branch will always be folded.
4017 llvm::BasicBlock *FinallyCallExit =
4018 CGF.createBasicBlock("finally.call_exit");
4019 llvm::BasicBlock *FinallyNoCallExit =
4020 CGF.createBasicBlock("finally.no_call_exit");
4021 CGF.Builder.CreateCondBr(CGF.Builder.CreateLoad(CallTryExitVar),
4022 FinallyCallExit, FinallyNoCallExit);
4024 CGF.EmitBlock(FinallyCallExit);
4025 CGF.EmitNounwindRuntimeCall(ObjCTypes.getExceptionTryExitFn(),
4026 ExceptionData.getPointer());
4028 CGF.EmitBlock(FinallyNoCallExit);
4030 if (isa<ObjCAtTryStmt>(S)) {
4031 if (const ObjCAtFinallyStmt* FinallyStmt =
4032 cast<ObjCAtTryStmt>(S).getFinallyStmt()) {
4033 // Don't try to do the @finally if this is an EH cleanup.
4034 if (flags.isForEHCleanup()) return;
4036 // Save the current cleanup destination in case there's
4037 // control flow inside the finally statement.
4038 llvm::Value *CurCleanupDest =
4039 CGF.Builder.CreateLoad(CGF.getNormalCleanupDestSlot());
4041 CGF.EmitStmt(FinallyStmt->getFinallyBody());
4043 if (CGF.HaveInsertPoint()) {
4044 CGF.Builder.CreateStore(CurCleanupDest,
4045 CGF.getNormalCleanupDestSlot());
4047 // Currently, the end of the cleanup must always exist.
4048 CGF.EnsureInsertPoint();
4052 // Emit objc_sync_exit(expr); as finally's sole statement for
4054 llvm::Value *SyncArg = CGF.Builder.CreateLoad(SyncArgSlot);
4055 CGF.EmitNounwindRuntimeCall(ObjCTypes.getSyncExitFn(), SyncArg);
4060 class FragileHazards {
4061 CodeGenFunction &CGF;
4062 SmallVector<llvm::Value*, 20> Locals;
4063 llvm::DenseSet<llvm::BasicBlock*> BlocksBeforeTry;
4065 llvm::InlineAsm *ReadHazard;
4066 llvm::InlineAsm *WriteHazard;
4068 llvm::FunctionType *GetAsmFnType();
4070 void collectLocals();
4071 void emitReadHazard(CGBuilderTy &Builder);
4074 FragileHazards(CodeGenFunction &CGF);
4076 void emitWriteHazard();
4077 void emitHazardsInNewBlocks();
4079 } // end anonymous namespace
4081 /// Create the fragile-ABI read and write hazards based on the current
4082 /// state of the function, which is presumed to be immediately prior
4083 /// to a @try block. These hazards are used to maintain correct
4084 /// semantics in the face of optimization and the fragile ABI's
4085 /// cavalier use of setjmp/longjmp.
4086 FragileHazards::FragileHazards(CodeGenFunction &CGF) : CGF(CGF) {
4089 if (Locals.empty()) return;
4091 // Collect all the blocks in the function.
4092 for (llvm::Function::iterator
4093 I = CGF.CurFn->begin(), E = CGF.CurFn->end(); I != E; ++I)
4094 BlocksBeforeTry.insert(&*I);
4096 llvm::FunctionType *AsmFnTy = GetAsmFnType();
4098 // Create a read hazard for the allocas. This inhibits dead-store
4099 // optimizations and forces the values to memory. This hazard is
4100 // inserted before any 'throwing' calls in the protected scope to
4101 // reflect the possibility that the variables might be read from the
4102 // catch block if the call throws.
4104 std::string Constraint;
4105 for (unsigned I = 0, E = Locals.size(); I != E; ++I) {
4106 if (I) Constraint += ',';
4110 ReadHazard = llvm::InlineAsm::get(AsmFnTy, "", Constraint, true, false);
4113 // Create a write hazard for the allocas. This inhibits folding
4114 // loads across the hazard. This hazard is inserted at the
4115 // beginning of the catch path to reflect the possibility that the
4116 // variables might have been written within the protected scope.
4118 std::string Constraint;
4119 for (unsigned I = 0, E = Locals.size(); I != E; ++I) {
4120 if (I) Constraint += ',';
4121 Constraint += "=*m";
4124 WriteHazard = llvm::InlineAsm::get(AsmFnTy, "", Constraint, true, false);
4128 /// Emit a write hazard at the current location.
4129 void FragileHazards::emitWriteHazard() {
4130 if (Locals.empty()) return;
4132 CGF.EmitNounwindRuntimeCall(WriteHazard, Locals);
4135 void FragileHazards::emitReadHazard(CGBuilderTy &Builder) {
4136 assert(!Locals.empty());
4137 llvm::CallInst *call = Builder.CreateCall(ReadHazard, Locals);
4138 call->setDoesNotThrow();
4139 call->setCallingConv(CGF.getRuntimeCC());
4142 /// Emit read hazards in all the protected blocks, i.e. all the blocks
4143 /// which have been inserted since the beginning of the try.
4144 void FragileHazards::emitHazardsInNewBlocks() {
4145 if (Locals.empty()) return;
4147 CGBuilderTy Builder(CGF, CGF.getLLVMContext());
4149 // Iterate through all blocks, skipping those prior to the try.
4150 for (llvm::Function::iterator
4151 FI = CGF.CurFn->begin(), FE = CGF.CurFn->end(); FI != FE; ++FI) {
4152 llvm::BasicBlock &BB = *FI;
4153 if (BlocksBeforeTry.count(&BB)) continue;
4155 // Walk through all the calls in the block.
4156 for (llvm::BasicBlock::iterator
4157 BI = BB.begin(), BE = BB.end(); BI != BE; ++BI) {
4158 llvm::Instruction &I = *BI;
4160 // Ignore instructions that aren't non-intrinsic calls.
4161 // These are the only calls that can possibly call longjmp.
4162 if (!isa<llvm::CallInst>(I) && !isa<llvm::InvokeInst>(I)) continue;
4163 if (isa<llvm::IntrinsicInst>(I))
4166 // Ignore call sites marked nounwind. This may be questionable,
4167 // since 'nounwind' doesn't necessarily mean 'does not call longjmp'.
4168 llvm::CallSite CS(&I);
4169 if (CS.doesNotThrow()) continue;
4171 // Insert a read hazard before the call. This will ensure that
4172 // any writes to the locals are performed before making the
4173 // call. If the call throws, then this is sufficient to
4174 // guarantee correctness as long as it doesn't also write to any
4176 Builder.SetInsertPoint(&BB, BI);
4177 emitReadHazard(Builder);
4182 static void addIfPresent(llvm::DenseSet<llvm::Value*> &S, llvm::Value *V) {
4186 static void addIfPresent(llvm::DenseSet<llvm::Value*> &S, Address V) {
4187 if (V.isValid()) S.insert(V.getPointer());
4190 void FragileHazards::collectLocals() {
4191 // Compute a set of allocas to ignore.
4192 llvm::DenseSet<llvm::Value*> AllocasToIgnore;
4193 addIfPresent(AllocasToIgnore, CGF.ReturnValue);
4194 addIfPresent(AllocasToIgnore, CGF.NormalCleanupDest);
4196 // Collect all the allocas currently in the function. This is
4197 // probably way too aggressive.
4198 llvm::BasicBlock &Entry = CGF.CurFn->getEntryBlock();
4199 for (llvm::BasicBlock::iterator
4200 I = Entry.begin(), E = Entry.end(); I != E; ++I)
4201 if (isa<llvm::AllocaInst>(*I) && !AllocasToIgnore.count(&*I))
4202 Locals.push_back(&*I);
4205 llvm::FunctionType *FragileHazards::GetAsmFnType() {
4206 SmallVector<llvm::Type *, 16> tys(Locals.size());
4207 for (unsigned i = 0, e = Locals.size(); i != e; ++i)
4208 tys[i] = Locals[i]->getType();
4209 return llvm::FunctionType::get(CGF.VoidTy, tys, false);
4214 Objective-C setjmp-longjmp (sjlj) Exception Handling
4217 A catch buffer is a setjmp buffer plus:
4218 - a pointer to the exception that was caught
4219 - a pointer to the previous exception data buffer
4220 - two pointers of reserved storage
4221 Therefore catch buffers form a stack, with a pointer to the top
4222 of the stack kept in thread-local storage.
4224 objc_exception_try_enter pushes a catch buffer onto the EH stack.
4225 objc_exception_try_exit pops the given catch buffer, which is
4226 required to be the top of the EH stack.
4227 objc_exception_throw pops the top of the EH stack, writes the
4228 thrown exception into the appropriate field, and longjmps
4229 to the setjmp buffer. It crashes the process (with a printf
4230 and an abort()) if there are no catch buffers on the stack.
4231 objc_exception_extract just reads the exception pointer out of the
4234 There's no reason an implementation couldn't use a light-weight
4235 setjmp here --- something like __builtin_setjmp, but API-compatible
4236 with the heavyweight setjmp. This will be more important if we ever
4237 want to implement correct ObjC/C++ exception interactions for the
4240 Note that for this use of setjmp/longjmp to be correct, we may need
4241 to mark some local variables volatile: if a non-volatile local
4242 variable is modified between the setjmp and the longjmp, it has
4243 indeterminate value. For the purposes of LLVM IR, it may be
4244 sufficient to make loads and stores within the @try (to variables
4245 declared outside the @try) volatile. This is necessary for
4246 optimized correctness, but is not currently being done; this is
4247 being tracked as rdar://problem/8160285
4249 The basic framework for a @try-catch-finally is as follows:
4251 objc_exception_data d;
4253 bool _call_try_exit = true;
4255 objc_exception_try_enter(&d);
4256 if (!setjmp(d.jmp_buf)) {
4260 id _caught = objc_exception_extract(&d);
4262 // enter new try scope for handlers
4263 if (!setjmp(d.jmp_buf)) {
4264 ... match exception and execute catch blocks ...
4266 // fell off end, rethrow.
4268 ... jump-through-finally to finally_rethrow ...
4270 // exception in catch block
4271 _rethrow = objc_exception_extract(&d);
4272 _call_try_exit = false;
4273 ... jump-through-finally to finally_rethrow ...
4276 ... jump-through-finally to finally_end ...
4280 objc_exception_try_exit(&d);
4282 ... finally block ....
4283 ... dispatch to finally destination ...
4286 objc_exception_throw(_rethrow);
4291 This framework differs slightly from the one gcc uses, in that gcc
4292 uses _rethrow to determine if objc_exception_try_exit should be called
4293 and if the object should be rethrown. This breaks in the face of
4294 throwing nil and introduces unnecessary branches.
4296 We specialize this framework for a few particular circumstances:
4298 - If there are no catch blocks, then we avoid emitting the second
4299 exception handling context.
4301 - If there is a catch-all catch block (i.e. @catch(...) or @catch(id
4302 e)) we avoid emitting the code to rethrow an uncaught exception.
4304 - FIXME: If there is no @finally block we can do a few more
4307 Rethrows and Jumps-Through-Finally
4310 '@throw;' is supported by pushing the currently-caught exception
4311 onto ObjCEHStack while the @catch blocks are emitted.
4313 Branches through the @finally block are handled with an ordinary
4314 normal cleanup. We do not register an EH cleanup; fragile-ABI ObjC
4315 exceptions are not compatible with C++ exceptions, and this is
4316 hardly the only place where this will go wrong.
4318 @synchronized(expr) { stmt; } is emitted as if it were:
4319 id synch_value = expr;
4320 objc_sync_enter(synch_value);
4321 @try { stmt; } @finally { objc_sync_exit(synch_value); }
4324 void CGObjCMac::EmitTryOrSynchronizedStmt(CodeGen::CodeGenFunction &CGF,
4326 bool isTry = isa<ObjCAtTryStmt>(S);
4328 // A destination for the fall-through edges of the catch handlers to
4330 CodeGenFunction::JumpDest FinallyEnd =
4331 CGF.getJumpDestInCurrentScope("finally.end");
4333 // A destination for the rethrow edge of the catch handlers to jump
4335 CodeGenFunction::JumpDest FinallyRethrow =
4336 CGF.getJumpDestInCurrentScope("finally.rethrow");
4338 // For @synchronized, call objc_sync_enter(sync.expr). The
4339 // evaluation of the expression must occur before we enter the
4340 // @synchronized. We can't avoid a temp here because we need the
4341 // value to be preserved. If the backend ever does liveness
4342 // correctly after setjmp, this will be unnecessary.
4343 Address SyncArgSlot = Address::invalid();
4345 llvm::Value *SyncArg =
4346 CGF.EmitScalarExpr(cast<ObjCAtSynchronizedStmt>(S).getSynchExpr());
4347 SyncArg = CGF.Builder.CreateBitCast(SyncArg, ObjCTypes.ObjectPtrTy);
4348 CGF.EmitNounwindRuntimeCall(ObjCTypes.getSyncEnterFn(), SyncArg);
4350 SyncArgSlot = CGF.CreateTempAlloca(SyncArg->getType(),
4351 CGF.getPointerAlign(), "sync.arg");
4352 CGF.Builder.CreateStore(SyncArg, SyncArgSlot);
4355 // Allocate memory for the setjmp buffer. This needs to be kept
4356 // live throughout the try and catch blocks.
4357 Address ExceptionData = CGF.CreateTempAlloca(ObjCTypes.ExceptionDataTy,
4358 CGF.getPointerAlign(),
4359 "exceptiondata.ptr");
4361 // Create the fragile hazards. Note that this will not capture any
4362 // of the allocas required for exception processing, but will
4363 // capture the current basic block (which extends all the way to the
4364 // setjmp call) as "before the @try".
4365 FragileHazards Hazards(CGF);
4367 // Create a flag indicating whether the cleanup needs to call
4368 // objc_exception_try_exit. This is true except when
4369 // - no catches match and we're branching through the cleanup
4370 // just to rethrow the exception, or
4371 // - a catch matched and we're falling out of the catch handler.
4372 // The setjmp-safety rule here is that we should always store to this
4373 // variable in a place that dominates the branch through the cleanup
4374 // without passing through any setjmps.
4375 Address CallTryExitVar = CGF.CreateTempAlloca(CGF.Builder.getInt1Ty(),
4379 // A slot containing the exception to rethrow. Only needed when we
4380 // have both a @catch and a @finally.
4381 Address PropagatingExnVar = Address::invalid();
4383 // Push a normal cleanup to leave the try scope.
4384 CGF.EHStack.pushCleanup<PerformFragileFinally>(NormalAndEHCleanup, &S,
4390 // Enter a try block:
4391 // - Call objc_exception_try_enter to push ExceptionData on top of
4393 CGF.EmitNounwindRuntimeCall(ObjCTypes.getExceptionTryEnterFn(),
4394 ExceptionData.getPointer());
4396 // - Call setjmp on the exception data buffer.
4397 llvm::Constant *Zero = llvm::ConstantInt::get(CGF.Builder.getInt32Ty(), 0);
4398 llvm::Value *GEPIndexes[] = { Zero, Zero, Zero };
4399 llvm::Value *SetJmpBuffer = CGF.Builder.CreateGEP(
4400 ObjCTypes.ExceptionDataTy, ExceptionData.getPointer(), GEPIndexes,
4402 llvm::CallInst *SetJmpResult = CGF.EmitNounwindRuntimeCall(
4403 ObjCTypes.getSetJmpFn(), SetJmpBuffer, "setjmp_result");
4404 SetJmpResult->setCanReturnTwice();
4406 // If setjmp returned 0, enter the protected block; otherwise,
4407 // branch to the handler.
4408 llvm::BasicBlock *TryBlock = CGF.createBasicBlock("try");
4409 llvm::BasicBlock *TryHandler = CGF.createBasicBlock("try.handler");
4410 llvm::Value *DidCatch =
4411 CGF.Builder.CreateIsNotNull(SetJmpResult, "did_catch_exception");
4412 CGF.Builder.CreateCondBr(DidCatch, TryHandler, TryBlock);
4414 // Emit the protected block.
4415 CGF.EmitBlock(TryBlock);
4416 CGF.Builder.CreateStore(CGF.Builder.getTrue(), CallTryExitVar);
4417 CGF.EmitStmt(isTry ? cast<ObjCAtTryStmt>(S).getTryBody()
4418 : cast<ObjCAtSynchronizedStmt>(S).getSynchBody());
4420 CGBuilderTy::InsertPoint TryFallthroughIP = CGF.Builder.saveAndClearIP();
4422 // Emit the exception handler block.
4423 CGF.EmitBlock(TryHandler);
4425 // Don't optimize loads of the in-scope locals across this point.
4426 Hazards.emitWriteHazard();
4428 // For a @synchronized (or a @try with no catches), just branch
4429 // through the cleanup to the rethrow block.
4430 if (!isTry || !cast<ObjCAtTryStmt>(S).getNumCatchStmts()) {
4431 // Tell the cleanup not to re-pop the exit.
4432 CGF.Builder.CreateStore(CGF.Builder.getFalse(), CallTryExitVar);
4433 CGF.EmitBranchThroughCleanup(FinallyRethrow);
4435 // Otherwise, we have to match against the caught exceptions.
4437 // Retrieve the exception object. We may emit multiple blocks but
4438 // nothing can cross this so the value is already in SSA form.
4439 llvm::CallInst *Caught =
4440 CGF.EmitNounwindRuntimeCall(ObjCTypes.getExceptionExtractFn(),
4441 ExceptionData.getPointer(), "caught");
4443 // Push the exception to rethrow onto the EH value stack for the
4444 // benefit of any @throws in the handlers.
4445 CGF.ObjCEHValueStack.push_back(Caught);
4447 const ObjCAtTryStmt* AtTryStmt = cast<ObjCAtTryStmt>(&S);
4449 bool HasFinally = (AtTryStmt->getFinallyStmt() != nullptr);
4451 llvm::BasicBlock *CatchBlock = nullptr;
4452 llvm::BasicBlock *CatchHandler = nullptr;
4454 // Save the currently-propagating exception before
4455 // objc_exception_try_enter clears the exception slot.
4456 PropagatingExnVar = CGF.CreateTempAlloca(Caught->getType(),
4457 CGF.getPointerAlign(),
4458 "propagating_exception");
4459 CGF.Builder.CreateStore(Caught, PropagatingExnVar);
4461 // Enter a new exception try block (in case a @catch block
4462 // throws an exception).
4463 CGF.EmitNounwindRuntimeCall(ObjCTypes.getExceptionTryEnterFn(),
4464 ExceptionData.getPointer());
4466 llvm::CallInst *SetJmpResult =
4467 CGF.EmitNounwindRuntimeCall(ObjCTypes.getSetJmpFn(),
4468 SetJmpBuffer, "setjmp.result");
4469 SetJmpResult->setCanReturnTwice();
4471 llvm::Value *Threw =
4472 CGF.Builder.CreateIsNotNull(SetJmpResult, "did_catch_exception");
4474 CatchBlock = CGF.createBasicBlock("catch");
4475 CatchHandler = CGF.createBasicBlock("catch_for_catch");
4476 CGF.Builder.CreateCondBr(Threw, CatchHandler, CatchBlock);
4478 CGF.EmitBlock(CatchBlock);
4481 CGF.Builder.CreateStore(CGF.Builder.getInt1(HasFinally), CallTryExitVar);
4483 // Handle catch list. As a special case we check if everything is
4484 // matched and avoid generating code for falling off the end if
4486 bool AllMatched = false;
4487 for (unsigned I = 0, N = AtTryStmt->getNumCatchStmts(); I != N; ++I) {
4488 const ObjCAtCatchStmt *CatchStmt = AtTryStmt->getCatchStmt(I);
4490 const VarDecl *CatchParam = CatchStmt->getCatchParamDecl();
4491 const ObjCObjectPointerType *OPT = nullptr;
4493 // catch(...) always matches.
4497 OPT = CatchParam->getType()->getAs<ObjCObjectPointerType>();
4499 // catch(id e) always matches under this ABI, since only
4500 // ObjC exceptions end up here in the first place.
4501 // FIXME: For the time being we also match id<X>; this should
4502 // be rejected by Sema instead.
4503 if (OPT && (OPT->isObjCIdType() || OPT->isObjCQualifiedIdType()))
4507 // If this is a catch-all, we don't need to test anything.
4509 CodeGenFunction::RunCleanupsScope CatchVarCleanups(CGF);
4512 CGF.EmitAutoVarDecl(*CatchParam);
4513 assert(CGF.HaveInsertPoint() && "DeclStmt destroyed insert point?");
4515 // These types work out because ConvertType(id) == i8*.
4516 EmitInitOfCatchParam(CGF, Caught, CatchParam);
4519 CGF.EmitStmt(CatchStmt->getCatchBody());
4521 // The scope of the catch variable ends right here.
4522 CatchVarCleanups.ForceCleanup();
4524 CGF.EmitBranchThroughCleanup(FinallyEnd);
4528 assert(OPT && "Unexpected non-object pointer type in @catch");
4529 const ObjCObjectType *ObjTy = OPT->getObjectType();
4531 // FIXME: @catch (Class c) ?
4532 ObjCInterfaceDecl *IDecl = ObjTy->getInterface();
4533 assert(IDecl && "Catch parameter must have Objective-C type!");
4535 // Check if the @catch block matches the exception object.
4536 llvm::Value *Class = EmitClassRef(CGF, IDecl);
4538 llvm::Value *matchArgs[] = { Class, Caught };
4539 llvm::CallInst *Match =
4540 CGF.EmitNounwindRuntimeCall(ObjCTypes.getExceptionMatchFn(),
4541 matchArgs, "match");
4543 llvm::BasicBlock *MatchedBlock = CGF.createBasicBlock("match");
4544 llvm::BasicBlock *NextCatchBlock = CGF.createBasicBlock("catch.next");
4546 CGF.Builder.CreateCondBr(CGF.Builder.CreateIsNotNull(Match, "matched"),
4547 MatchedBlock, NextCatchBlock);
4549 // Emit the @catch block.
4550 CGF.EmitBlock(MatchedBlock);
4552 // Collect any cleanups for the catch variable. The scope lasts until
4553 // the end of the catch body.
4554 CodeGenFunction::RunCleanupsScope CatchVarCleanups(CGF);
4556 CGF.EmitAutoVarDecl(*CatchParam);
4557 assert(CGF.HaveInsertPoint() && "DeclStmt destroyed insert point?");
4559 // Initialize the catch variable.
4561 CGF.Builder.CreateBitCast(Caught,
4562 CGF.ConvertType(CatchParam->getType()));
4563 EmitInitOfCatchParam(CGF, Tmp, CatchParam);
4565 CGF.EmitStmt(CatchStmt->getCatchBody());
4567 // We're done with the catch variable.
4568 CatchVarCleanups.ForceCleanup();
4570 CGF.EmitBranchThroughCleanup(FinallyEnd);
4572 CGF.EmitBlock(NextCatchBlock);
4575 CGF.ObjCEHValueStack.pop_back();
4577 // If nothing wanted anything to do with the caught exception,
4578 // kill the extract call.
4579 if (Caught->use_empty())
4580 Caught->eraseFromParent();
4583 CGF.EmitBranchThroughCleanup(FinallyRethrow);
4586 // Emit the exception handler for the @catch blocks.
4587 CGF.EmitBlock(CatchHandler);
4589 // In theory we might now need a write hazard, but actually it's
4590 // unnecessary because there's no local-accessing code between
4591 // the try's write hazard and here.
4592 //Hazards.emitWriteHazard();
4594 // Extract the new exception and save it to the
4595 // propagating-exception slot.
4596 assert(PropagatingExnVar.isValid());
4597 llvm::CallInst *NewCaught =
4598 CGF.EmitNounwindRuntimeCall(ObjCTypes.getExceptionExtractFn(),
4599 ExceptionData.getPointer(), "caught");
4600 CGF.Builder.CreateStore(NewCaught, PropagatingExnVar);
4602 // Don't pop the catch handler; the throw already did.
4603 CGF.Builder.CreateStore(CGF.Builder.getFalse(), CallTryExitVar);
4604 CGF.EmitBranchThroughCleanup(FinallyRethrow);
4608 // Insert read hazards as required in the new blocks.
4609 Hazards.emitHazardsInNewBlocks();
4612 CGF.Builder.restoreIP(TryFallthroughIP);
4613 if (CGF.HaveInsertPoint())
4614 CGF.Builder.CreateStore(CGF.Builder.getTrue(), CallTryExitVar);
4615 CGF.PopCleanupBlock();
4616 CGF.EmitBlock(FinallyEnd.getBlock(), true);
4618 // Emit the rethrow block.
4619 CGBuilderTy::InsertPoint SavedIP = CGF.Builder.saveAndClearIP();
4620 CGF.EmitBlock(FinallyRethrow.getBlock(), true);
4621 if (CGF.HaveInsertPoint()) {
4622 // If we have a propagating-exception variable, check it.
4623 llvm::Value *PropagatingExn;
4624 if (PropagatingExnVar.isValid()) {
4625 PropagatingExn = CGF.Builder.CreateLoad(PropagatingExnVar);
4627 // Otherwise, just look in the buffer for the exception to throw.
4629 llvm::CallInst *Caught =
4630 CGF.EmitNounwindRuntimeCall(ObjCTypes.getExceptionExtractFn(),
4631 ExceptionData.getPointer());
4632 PropagatingExn = Caught;
4635 CGF.EmitNounwindRuntimeCall(ObjCTypes.getExceptionThrowFn(),
4637 CGF.Builder.CreateUnreachable();
4640 CGF.Builder.restoreIP(SavedIP);
4643 void CGObjCMac::EmitThrowStmt(CodeGen::CodeGenFunction &CGF,
4644 const ObjCAtThrowStmt &S,
4645 bool ClearInsertionPoint) {
4646 llvm::Value *ExceptionAsObject;
4648 if (const Expr *ThrowExpr = S.getThrowExpr()) {
4649 llvm::Value *Exception = CGF.EmitObjCThrowOperand(ThrowExpr);
4651 CGF.Builder.CreateBitCast(Exception, ObjCTypes.ObjectPtrTy);
4653 assert((!CGF.ObjCEHValueStack.empty() && CGF.ObjCEHValueStack.back()) &&
4654 "Unexpected rethrow outside @catch block.");
4655 ExceptionAsObject = CGF.ObjCEHValueStack.back();
4658 CGF.EmitRuntimeCall(ObjCTypes.getExceptionThrowFn(), ExceptionAsObject)
4659 ->setDoesNotReturn();
4660 CGF.Builder.CreateUnreachable();
4662 // Clear the insertion point to indicate we are in unreachable code.
4663 if (ClearInsertionPoint)
4664 CGF.Builder.ClearInsertionPoint();
4667 /// EmitObjCWeakRead - Code gen for loading value of a __weak
4668 /// object: objc_read_weak (id *src)
4670 llvm::Value * CGObjCMac::EmitObjCWeakRead(CodeGen::CodeGenFunction &CGF,
4671 Address AddrWeakObj) {
4672 llvm::Type* DestTy = AddrWeakObj.getElementType();
4673 AddrWeakObj = CGF.Builder.CreateBitCast(AddrWeakObj,
4674 ObjCTypes.PtrObjectPtrTy);
4675 llvm::Value *read_weak =
4676 CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcReadWeakFn(),
4677 AddrWeakObj.getPointer(), "weakread");
4678 read_weak = CGF.Builder.CreateBitCast(read_weak, DestTy);
4682 /// EmitObjCWeakAssign - Code gen for assigning to a __weak object.
4683 /// objc_assign_weak (id src, id *dst)
4685 void CGObjCMac::EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF,
4686 llvm::Value *src, Address dst) {
4687 llvm::Type * SrcTy = src->getType();
4688 if (!isa<llvm::PointerType>(SrcTy)) {
4689 unsigned Size = CGM.getDataLayout().getTypeAllocSize(SrcTy);
4690 assert(Size <= 8 && "does not support size > 8");
4691 src = (Size == 4) ? CGF.Builder.CreateBitCast(src, CGM.Int32Ty)
4692 : CGF.Builder.CreateBitCast(src, CGM.Int64Ty);
4693 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy);
4695 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy);
4696 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy);
4697 llvm::Value *args[] = { src, dst.getPointer() };
4698 CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignWeakFn(),
4699 args, "weakassign");
4702 /// EmitObjCGlobalAssign - Code gen for assigning to a __strong object.
4703 /// objc_assign_global (id src, id *dst)
4705 void CGObjCMac::EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF,
4706 llvm::Value *src, Address dst,
4708 llvm::Type * SrcTy = src->getType();
4709 if (!isa<llvm::PointerType>(SrcTy)) {
4710 unsigned Size = CGM.getDataLayout().getTypeAllocSize(SrcTy);
4711 assert(Size <= 8 && "does not support size > 8");
4712 src = (Size == 4) ? CGF.Builder.CreateBitCast(src, CGM.Int32Ty)
4713 : CGF.Builder.CreateBitCast(src, CGM.Int64Ty);
4714 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy);
4716 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy);
4717 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy);
4718 llvm::Value *args[] = { src, dst.getPointer() };
4720 CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignGlobalFn(),
4721 args, "globalassign");
4723 CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignThreadLocalFn(),
4724 args, "threadlocalassign");
4727 /// EmitObjCIvarAssign - Code gen for assigning to a __strong object.
4728 /// objc_assign_ivar (id src, id *dst, ptrdiff_t ivaroffset)
4730 void CGObjCMac::EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF,
4731 llvm::Value *src, Address dst,
4732 llvm::Value *ivarOffset) {
4733 assert(ivarOffset && "EmitObjCIvarAssign - ivarOffset is NULL");
4734 llvm::Type * SrcTy = src->getType();
4735 if (!isa<llvm::PointerType>(SrcTy)) {
4736 unsigned Size = CGM.getDataLayout().getTypeAllocSize(SrcTy);
4737 assert(Size <= 8 && "does not support size > 8");
4738 src = (Size == 4) ? CGF.Builder.CreateBitCast(src, CGM.Int32Ty)
4739 : CGF.Builder.CreateBitCast(src, CGM.Int64Ty);
4740 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy);
4742 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy);
4743 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy);
4744 llvm::Value *args[] = { src, dst.getPointer(), ivarOffset };
4745 CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignIvarFn(), args);
4748 /// EmitObjCStrongCastAssign - Code gen for assigning to a __strong cast object.
4749 /// objc_assign_strongCast (id src, id *dst)
4751 void CGObjCMac::EmitObjCStrongCastAssign(CodeGen::CodeGenFunction &CGF,
4752 llvm::Value *src, Address dst) {
4753 llvm::Type * SrcTy = src->getType();
4754 if (!isa<llvm::PointerType>(SrcTy)) {
4755 unsigned Size = CGM.getDataLayout().getTypeAllocSize(SrcTy);
4756 assert(Size <= 8 && "does not support size > 8");
4757 src = (Size == 4) ? CGF.Builder.CreateBitCast(src, CGM.Int32Ty)
4758 : CGF.Builder.CreateBitCast(src, CGM.Int64Ty);
4759 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy);
4761 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy);
4762 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy);
4763 llvm::Value *args[] = { src, dst.getPointer() };
4764 CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignStrongCastFn(),
4765 args, "strongassign");
4768 void CGObjCMac::EmitGCMemmoveCollectable(CodeGen::CodeGenFunction &CGF,
4771 llvm::Value *size) {
4772 SrcPtr = CGF.Builder.CreateBitCast(SrcPtr, ObjCTypes.Int8PtrTy);
4773 DestPtr = CGF.Builder.CreateBitCast(DestPtr, ObjCTypes.Int8PtrTy);
4774 llvm::Value *args[] = { DestPtr.getPointer(), SrcPtr.getPointer(), size };
4775 CGF.EmitNounwindRuntimeCall(ObjCTypes.GcMemmoveCollectableFn(), args);
4778 /// EmitObjCValueForIvar - Code Gen for ivar reference.
4780 LValue CGObjCMac::EmitObjCValueForIvar(CodeGen::CodeGenFunction &CGF,
4782 llvm::Value *BaseValue,
4783 const ObjCIvarDecl *Ivar,
4784 unsigned CVRQualifiers) {
4785 const ObjCInterfaceDecl *ID =
4786 ObjectTy->getAs<ObjCObjectType>()->getInterface();
4787 return EmitValueForIvarAtOffset(CGF, ID, BaseValue, Ivar, CVRQualifiers,
4788 EmitIvarOffset(CGF, ID, Ivar));
4791 llvm::Value *CGObjCMac::EmitIvarOffset(CodeGen::CodeGenFunction &CGF,
4792 const ObjCInterfaceDecl *Interface,
4793 const ObjCIvarDecl *Ivar) {
4794 uint64_t Offset = ComputeIvarBaseOffset(CGM, Interface, Ivar);
4795 return llvm::ConstantInt::get(
4796 CGM.getTypes().ConvertType(CGM.getContext().LongTy),
4800 /* *** Private Interface *** */
4802 std::string CGObjCCommonMac::GetSectionName(StringRef Section,
4803 StringRef MachOAttributes) {
4804 switch (CGM.getTriple().getObjectFormat()) {
4806 llvm_unreachable("unexpected object file format");
4807 case llvm::Triple::MachO: {
4808 if (MachOAttributes.empty())
4809 return ("__DATA," + Section).str();
4810 return ("__DATA," + Section + "," + MachOAttributes).str();
4812 case llvm::Triple::ELF:
4813 assert(Section.substr(0, 2) == "__" &&
4814 "expected the name to begin with __");
4815 return Section.substr(2).str();
4816 case llvm::Triple::COFF:
4817 assert(Section.substr(0, 2) == "__" &&
4818 "expected the name to begin with __");
4819 return ("." + Section.substr(2) + "$B").str();
4823 /// EmitImageInfo - Emit the image info marker used to encode some module
4824 /// level information.
4826 /// See: <rdr://4810609&4810587&4810587>
4827 /// struct IMAGE_INFO {
4828 /// unsigned version;
4831 enum ImageInfoFlags {
4832 eImageInfo_FixAndContinue = (1 << 0), // This flag is no longer set by clang.
4833 eImageInfo_GarbageCollected = (1 << 1),
4834 eImageInfo_GCOnly = (1 << 2),
4835 eImageInfo_OptimizedByDyld = (1 << 3), // This flag is set by the dyld shared cache.
4837 // A flag indicating that the module has no instances of a @synthesize of a
4838 // superclass variable. <rdar://problem/6803242>
4839 eImageInfo_CorrectedSynthesize = (1 << 4), // This flag is no longer set by clang.
4840 eImageInfo_ImageIsSimulated = (1 << 5),
4841 eImageInfo_ClassProperties = (1 << 6)
4844 void CGObjCCommonMac::EmitImageInfo() {
4845 unsigned version = 0; // Version is unused?
4846 std::string Section =
4848 ? "__OBJC,__image_info,regular"
4849 : GetSectionName("__objc_imageinfo", "regular,no_dead_strip");
4851 // Generate module-level named metadata to convey this information to the
4852 // linker and code-gen.
4853 llvm::Module &Mod = CGM.getModule();
4855 // Add the ObjC ABI version to the module flags.
4856 Mod.addModuleFlag(llvm::Module::Error, "Objective-C Version", ObjCABI);
4857 Mod.addModuleFlag(llvm::Module::Error, "Objective-C Image Info Version",
4859 Mod.addModuleFlag(llvm::Module::Error, "Objective-C Image Info Section",
4860 llvm::MDString::get(VMContext, Section));
4862 if (CGM.getLangOpts().getGC() == LangOptions::NonGC) {
4863 // Non-GC overrides those files which specify GC.
4864 Mod.addModuleFlag(llvm::Module::Override,
4865 "Objective-C Garbage Collection", (uint32_t)0);
4867 // Add the ObjC garbage collection value.
4868 Mod.addModuleFlag(llvm::Module::Error,
4869 "Objective-C Garbage Collection",
4870 eImageInfo_GarbageCollected);
4872 if (CGM.getLangOpts().getGC() == LangOptions::GCOnly) {
4873 // Add the ObjC GC Only value.
4874 Mod.addModuleFlag(llvm::Module::Error, "Objective-C GC Only",
4877 // Require that GC be specified and set to eImageInfo_GarbageCollected.
4878 llvm::Metadata *Ops[2] = {
4879 llvm::MDString::get(VMContext, "Objective-C Garbage Collection"),
4880 llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
4881 llvm::Type::getInt32Ty(VMContext), eImageInfo_GarbageCollected))};
4882 Mod.addModuleFlag(llvm::Module::Require, "Objective-C GC Only",
4883 llvm::MDNode::get(VMContext, Ops));
4887 // Indicate whether we're compiling this to run on a simulator.
4888 const llvm::Triple &Triple = CGM.getTarget().getTriple();
4889 if ((Triple.isiOS() || Triple.isWatchOS()) &&
4890 (Triple.getArch() == llvm::Triple::x86 ||
4891 Triple.getArch() == llvm::Triple::x86_64))
4892 Mod.addModuleFlag(llvm::Module::Error, "Objective-C Is Simulated",
4893 eImageInfo_ImageIsSimulated);
4895 // Indicate whether we are generating class properties.
4896 Mod.addModuleFlag(llvm::Module::Error, "Objective-C Class Properties",
4897 eImageInfo_ClassProperties);
4900 // struct objc_module {
4901 // unsigned long version;
4902 // unsigned long size;
4903 // const char *name;
4907 // FIXME: Get from somewhere
4908 static const int ModuleVersion = 7;
4910 void CGObjCMac::EmitModuleInfo() {
4911 uint64_t Size = CGM.getDataLayout().getTypeAllocSize(ObjCTypes.ModuleTy);
4913 ConstantInitBuilder builder(CGM);
4914 auto values = builder.beginStruct(ObjCTypes.ModuleTy);
4915 values.addInt(ObjCTypes.LongTy, ModuleVersion);
4916 values.addInt(ObjCTypes.LongTy, Size);
4917 // This used to be the filename, now it is unused. <rdr://4327263>
4918 values.add(GetClassName(StringRef("")));
4919 values.add(EmitModuleSymbols());
4920 CreateMetadataVar("OBJC_MODULES", values,
4921 "__OBJC,__module_info,regular,no_dead_strip",
4922 CGM.getPointerAlign(), true);
4925 llvm::Constant *CGObjCMac::EmitModuleSymbols() {
4926 unsigned NumClasses = DefinedClasses.size();
4927 unsigned NumCategories = DefinedCategories.size();
4929 // Return null if no symbols were defined.
4930 if (!NumClasses && !NumCategories)
4931 return llvm::Constant::getNullValue(ObjCTypes.SymtabPtrTy);
4933 ConstantInitBuilder builder(CGM);
4934 auto values = builder.beginStruct();
4935 values.addInt(ObjCTypes.LongTy, 0);
4936 values.addNullPointer(ObjCTypes.SelectorPtrTy);
4937 values.addInt(ObjCTypes.ShortTy, NumClasses);
4938 values.addInt(ObjCTypes.ShortTy, NumCategories);
4940 // The runtime expects exactly the list of defined classes followed
4941 // by the list of defined categories, in a single array.
4942 auto array = values.beginArray(ObjCTypes.Int8PtrTy);
4943 for (unsigned i=0; i<NumClasses; i++) {
4944 const ObjCInterfaceDecl *ID = ImplementedClasses[i];
4946 if (ObjCImplementationDecl *IMP = ID->getImplementation())
4947 // We are implementing a weak imported interface. Give it external linkage
4948 if (ID->isWeakImported() && !IMP->isWeakImported())
4949 DefinedClasses[i]->setLinkage(llvm::GlobalVariable::ExternalLinkage);
4951 array.addBitCast(DefinedClasses[i], ObjCTypes.Int8PtrTy);
4953 for (unsigned i=0; i<NumCategories; i++)
4954 array.addBitCast(DefinedCategories[i], ObjCTypes.Int8PtrTy);
4956 array.finishAndAddTo(values);
4958 llvm::GlobalVariable *GV = CreateMetadataVar(
4959 "OBJC_SYMBOLS", values, "__OBJC,__symbols,regular,no_dead_strip",
4960 CGM.getPointerAlign(), true);
4961 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.SymtabPtrTy);
4964 llvm::Value *CGObjCMac::EmitClassRefFromId(CodeGenFunction &CGF,
4965 IdentifierInfo *II) {
4966 LazySymbols.insert(II);
4968 llvm::GlobalVariable *&Entry = ClassReferences[II];
4971 llvm::Constant *Casted =
4972 llvm::ConstantExpr::getBitCast(GetClassName(II->getName()),
4973 ObjCTypes.ClassPtrTy);
4974 Entry = CreateMetadataVar(
4975 "OBJC_CLASS_REFERENCES_", Casted,
4976 "__OBJC,__cls_refs,literal_pointers,no_dead_strip",
4977 CGM.getPointerAlign(), true);
4980 return CGF.Builder.CreateAlignedLoad(Entry, CGF.getPointerAlign());
4983 llvm::Value *CGObjCMac::EmitClassRef(CodeGenFunction &CGF,
4984 const ObjCInterfaceDecl *ID) {
4985 // If the class has the objc_runtime_visible attribute, we need to
4986 // use the Objective-C runtime to get the class.
4987 if (ID->hasAttr<ObjCRuntimeVisibleAttr>())
4988 return EmitClassRefViaRuntime(CGF, ID, ObjCTypes);
4990 return EmitClassRefFromId(CGF, ID->getIdentifier());
4993 llvm::Value *CGObjCMac::EmitNSAutoreleasePoolClassRef(CodeGenFunction &CGF) {
4994 IdentifierInfo *II = &CGM.getContext().Idents.get("NSAutoreleasePool");
4995 return EmitClassRefFromId(CGF, II);
4998 llvm::Value *CGObjCMac::EmitSelector(CodeGenFunction &CGF, Selector Sel) {
4999 return CGF.Builder.CreateLoad(EmitSelectorAddr(CGF, Sel));
5002 Address CGObjCMac::EmitSelectorAddr(CodeGenFunction &CGF, Selector Sel) {
5003 CharUnits Align = CGF.getPointerAlign();
5005 llvm::GlobalVariable *&Entry = SelectorReferences[Sel];
5007 llvm::Constant *Casted =
5008 llvm::ConstantExpr::getBitCast(GetMethodVarName(Sel),
5009 ObjCTypes.SelectorPtrTy);
5010 Entry = CreateMetadataVar(
5011 "OBJC_SELECTOR_REFERENCES_", Casted,
5012 "__OBJC,__message_refs,literal_pointers,no_dead_strip", Align, true);
5013 Entry->setExternallyInitialized(true);
5016 return Address(Entry, Align);
5019 llvm::Constant *CGObjCCommonMac::GetClassName(StringRef RuntimeName) {
5020 llvm::GlobalVariable *&Entry = ClassNames[RuntimeName];
5022 Entry = CreateCStringLiteral(RuntimeName, ObjCLabelType::ClassName);
5023 return getConstantGEP(VMContext, Entry, 0, 0);
5026 llvm::Function *CGObjCCommonMac::GetMethodDefinition(const ObjCMethodDecl *MD) {
5027 llvm::DenseMap<const ObjCMethodDecl*, llvm::Function*>::iterator
5028 I = MethodDefinitions.find(MD);
5029 if (I != MethodDefinitions.end())
5035 /// GetIvarLayoutName - Returns a unique constant for the given
5036 /// ivar layout bitmap.
5037 llvm::Constant *CGObjCCommonMac::GetIvarLayoutName(IdentifierInfo *Ident,
5038 const ObjCCommonTypesHelper &ObjCTypes) {
5039 return llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy);
5042 void IvarLayoutBuilder::visitRecord(const RecordType *RT,
5044 const RecordDecl *RD = RT->getDecl();
5046 // If this is a union, remember that we had one, because it might mess
5047 // up the ordering of layout entries.
5049 IsDisordered = true;
5051 const ASTRecordLayout *recLayout = nullptr;
5052 visitAggregate(RD->field_begin(), RD->field_end(), offset,
5053 [&](const FieldDecl *field) -> CharUnits {
5055 recLayout = &CGM.getContext().getASTRecordLayout(RD);
5056 auto offsetInBits = recLayout->getFieldOffset(field->getFieldIndex());
5057 return CGM.getContext().toCharUnitsFromBits(offsetInBits);
5061 template <class Iterator, class GetOffsetFn>
5062 void IvarLayoutBuilder::visitAggregate(Iterator begin, Iterator end,
5063 CharUnits aggregateOffset,
5064 const GetOffsetFn &getOffset) {
5065 for (; begin != end; ++begin) {
5066 auto field = *begin;
5068 // Skip over bitfields.
5069 if (field->isBitField()) {
5073 // Compute the offset of the field within the aggregate.
5074 CharUnits fieldOffset = aggregateOffset + getOffset(field);
5076 visitField(field, fieldOffset);
5080 /// Collect layout information for the given fields into IvarsInfo.
5081 void IvarLayoutBuilder::visitField(const FieldDecl *field,
5082 CharUnits fieldOffset) {
5083 QualType fieldType = field->getType();
5085 // Drill down into arrays.
5086 uint64_t numElts = 1;
5087 while (auto arrayType = CGM.getContext().getAsConstantArrayType(fieldType)) {
5088 numElts *= arrayType->getSize().getZExtValue();
5089 fieldType = arrayType->getElementType();
5092 assert(!fieldType->isArrayType() && "ivar of non-constant array type?");
5094 // If we ended up with a zero-sized array, we've done what we can do within
5095 // the limits of this layout encoding.
5096 if (numElts == 0) return;
5098 // Recurse if the base element type is a record type.
5099 if (auto recType = fieldType->getAs<RecordType>()) {
5100 size_t oldEnd = IvarsInfo.size();
5102 visitRecord(recType, fieldOffset);
5104 // If we have an array, replicate the first entry's layout information.
5105 auto numEltEntries = IvarsInfo.size() - oldEnd;
5106 if (numElts != 1 && numEltEntries != 0) {
5107 CharUnits eltSize = CGM.getContext().getTypeSizeInChars(recType);
5108 for (uint64_t eltIndex = 1; eltIndex != numElts; ++eltIndex) {
5109 // Copy the last numEltEntries onto the end of the array, adjusting
5110 // each for the element size.
5111 for (size_t i = 0; i != numEltEntries; ++i) {
5112 auto firstEntry = IvarsInfo[oldEnd + i];
5113 IvarsInfo.push_back(IvarInfo(firstEntry.Offset + eltIndex * eltSize,
5114 firstEntry.SizeInWords));
5122 // Classify the element type.
5123 Qualifiers::GC GCAttr = GetGCAttrTypeForType(CGM.getContext(), fieldType);
5125 // If it matches what we're looking for, add an entry.
5126 if ((ForStrongLayout && GCAttr == Qualifiers::Strong)
5127 || (!ForStrongLayout && GCAttr == Qualifiers::Weak)) {
5128 assert(CGM.getContext().getTypeSizeInChars(fieldType)
5129 == CGM.getPointerSize());
5130 IvarsInfo.push_back(IvarInfo(fieldOffset, numElts));
5134 /// buildBitmap - This routine does the horsework of taking the offsets of
5135 /// strong/weak references and creating a bitmap. The bitmap is also
5136 /// returned in the given buffer, suitable for being passed to \c dump().
5137 llvm::Constant *IvarLayoutBuilder::buildBitmap(CGObjCCommonMac &CGObjC,
5138 llvm::SmallVectorImpl<unsigned char> &buffer) {
5139 // The bitmap is a series of skip/scan instructions, aligned to word
5140 // boundaries. The skip is performed first.
5141 const unsigned char MaxNibble = 0xF;
5142 const unsigned char SkipMask = 0xF0, SkipShift = 4;
5143 const unsigned char ScanMask = 0x0F, ScanShift = 0;
5145 assert(!IvarsInfo.empty() && "generating bitmap for no data");
5147 // Sort the ivar info on byte position in case we encounterred a
5148 // union nested in the ivar list.
5150 // This isn't a stable sort, but our algorithm should handle it fine.
5151 llvm::array_pod_sort(IvarsInfo.begin(), IvarsInfo.end());
5153 assert(std::is_sorted(IvarsInfo.begin(), IvarsInfo.end()));
5155 assert(IvarsInfo.back().Offset < InstanceEnd);
5157 assert(buffer.empty());
5159 // Skip the next N words.
5160 auto skip = [&](unsigned numWords) {
5161 assert(numWords > 0);
5163 // Try to merge into the previous byte. Since scans happen second, we
5164 // can't do this if it includes a scan.
5165 if (!buffer.empty() && !(buffer.back() & ScanMask)) {
5166 unsigned lastSkip = buffer.back() >> SkipShift;
5167 if (lastSkip < MaxNibble) {
5168 unsigned claimed = std::min(MaxNibble - lastSkip, numWords);
5169 numWords -= claimed;
5170 lastSkip += claimed;
5171 buffer.back() = (lastSkip << SkipShift);
5175 while (numWords >= MaxNibble) {
5176 buffer.push_back(MaxNibble << SkipShift);
5177 numWords -= MaxNibble;
5180 buffer.push_back(numWords << SkipShift);
5184 // Scan the next N words.
5185 auto scan = [&](unsigned numWords) {
5186 assert(numWords > 0);
5188 // Try to merge into the previous byte. Since scans happen second, we can
5189 // do this even if it includes a skip.
5190 if (!buffer.empty()) {
5191 unsigned lastScan = (buffer.back() & ScanMask) >> ScanShift;
5192 if (lastScan < MaxNibble) {
5193 unsigned claimed = std::min(MaxNibble - lastScan, numWords);
5194 numWords -= claimed;
5195 lastScan += claimed;
5196 buffer.back() = (buffer.back() & SkipMask) | (lastScan << ScanShift);
5200 while (numWords >= MaxNibble) {
5201 buffer.push_back(MaxNibble << ScanShift);
5202 numWords -= MaxNibble;
5205 buffer.push_back(numWords << ScanShift);
5209 // One past the end of the last scan.
5210 unsigned endOfLastScanInWords = 0;
5211 const CharUnits WordSize = CGM.getPointerSize();
5213 // Consider all the scan requests.
5214 for (auto &request : IvarsInfo) {
5215 CharUnits beginOfScan = request.Offset - InstanceBegin;
5217 // Ignore scan requests that don't start at an even multiple of the
5218 // word size. We can't encode them.
5219 if ((beginOfScan % WordSize) != 0) continue;
5221 // Ignore scan requests that start before the instance start.
5222 // This assumes that scans never span that boundary. The boundary
5223 // isn't the true start of the ivars, because in the fragile-ARC case
5224 // it's rounded up to word alignment, but the test above should leave
5225 // us ignoring that possibility.
5226 if (beginOfScan.isNegative()) {
5227 assert(request.Offset + request.SizeInWords * WordSize <= InstanceBegin);
5231 unsigned beginOfScanInWords = beginOfScan / WordSize;
5232 unsigned endOfScanInWords = beginOfScanInWords + request.SizeInWords;
5234 // If the scan starts some number of words after the last one ended,
5236 if (beginOfScanInWords > endOfLastScanInWords) {
5237 skip(beginOfScanInWords - endOfLastScanInWords);
5239 // Otherwise, start scanning where the last left off.
5241 beginOfScanInWords = endOfLastScanInWords;
5243 // If that leaves us with nothing to scan, ignore this request.
5244 if (beginOfScanInWords >= endOfScanInWords) continue;
5247 // Scan to the end of the request.
5248 assert(beginOfScanInWords < endOfScanInWords);
5249 scan(endOfScanInWords - beginOfScanInWords);
5250 endOfLastScanInWords = endOfScanInWords;
5254 return llvm::ConstantPointerNull::get(CGM.Int8PtrTy);
5256 // For GC layouts, emit a skip to the end of the allocation so that we
5257 // have precise information about the entire thing. This isn't useful
5258 // or necessary for the ARC-style layout strings.
5259 if (CGM.getLangOpts().getGC() != LangOptions::NonGC) {
5260 unsigned lastOffsetInWords =
5261 (InstanceEnd - InstanceBegin + WordSize - CharUnits::One()) / WordSize;
5262 if (lastOffsetInWords > endOfLastScanInWords) {
5263 skip(lastOffsetInWords - endOfLastScanInWords);
5267 // Null terminate the string.
5268 buffer.push_back(0);
5270 auto *Entry = CGObjC.CreateCStringLiteral(
5271 reinterpret_cast<char *>(buffer.data()), ObjCLabelType::ClassName);
5272 return getConstantGEP(CGM.getLLVMContext(), Entry, 0, 0);
5275 /// BuildIvarLayout - Builds ivar layout bitmap for the class
5276 /// implementation for the __strong or __weak case.
5277 /// The layout map displays which words in ivar list must be skipped
5278 /// and which must be scanned by GC (see below). String is built of bytes.
5279 /// Each byte is divided up in two nibbles (4-bit each). Left nibble is count
5280 /// of words to skip and right nibble is count of words to scan. So, each
5281 /// nibble represents up to 15 workds to skip or scan. Skipping the rest is
5282 /// represented by a 0x00 byte which also ends the string.
5283 /// 1. when ForStrongLayout is true, following ivars are scanned:
5286 /// - __strong anything
5288 /// 2. When ForStrongLayout is false, following ivars are scanned:
5289 /// - __weak anything
5292 CGObjCCommonMac::BuildIvarLayout(const ObjCImplementationDecl *OMD,
5293 CharUnits beginOffset, CharUnits endOffset,
5294 bool ForStrongLayout, bool HasMRCWeakIvars) {
5295 // If this is MRC, and we're either building a strong layout or there
5296 // are no weak ivars, bail out early.
5297 llvm::Type *PtrTy = CGM.Int8PtrTy;
5298 if (CGM.getLangOpts().getGC() == LangOptions::NonGC &&
5299 !CGM.getLangOpts().ObjCAutoRefCount &&
5300 (ForStrongLayout || !HasMRCWeakIvars))
5301 return llvm::Constant::getNullValue(PtrTy);
5303 const ObjCInterfaceDecl *OI = OMD->getClassInterface();
5304 SmallVector<const ObjCIvarDecl*, 32> ivars;
5306 // GC layout strings include the complete object layout, possibly
5307 // inaccurately in the non-fragile ABI; the runtime knows how to fix this
5310 // ARC layout strings only include the class's ivars. In non-fragile
5311 // runtimes, that means starting at InstanceStart, rounded up to word
5312 // alignment. In fragile runtimes, there's no InstanceStart, so it means
5313 // starting at the offset of the first ivar, rounded up to word alignment.
5315 // MRC weak layout strings follow the ARC style.
5316 CharUnits baseOffset;
5317 if (CGM.getLangOpts().getGC() == LangOptions::NonGC) {
5318 for (const ObjCIvarDecl *IVD = OI->all_declared_ivar_begin();
5319 IVD; IVD = IVD->getNextIvar())
5320 ivars.push_back(IVD);
5322 if (isNonFragileABI()) {
5323 baseOffset = beginOffset; // InstanceStart
5324 } else if (!ivars.empty()) {
5326 CharUnits::fromQuantity(ComputeIvarBaseOffset(CGM, OMD, ivars[0]));
5328 baseOffset = CharUnits::Zero();
5331 baseOffset = baseOffset.alignTo(CGM.getPointerAlign());
5334 CGM.getContext().DeepCollectObjCIvars(OI, true, ivars);
5336 baseOffset = CharUnits::Zero();
5340 return llvm::Constant::getNullValue(PtrTy);
5342 IvarLayoutBuilder builder(CGM, baseOffset, endOffset, ForStrongLayout);
5344 builder.visitAggregate(ivars.begin(), ivars.end(), CharUnits::Zero(),
5345 [&](const ObjCIvarDecl *ivar) -> CharUnits {
5346 return CharUnits::fromQuantity(ComputeIvarBaseOffset(CGM, OMD, ivar));
5349 if (!builder.hasBitmapData())
5350 return llvm::Constant::getNullValue(PtrTy);
5352 llvm::SmallVector<unsigned char, 4> buffer;
5353 llvm::Constant *C = builder.buildBitmap(*this, buffer);
5355 if (CGM.getLangOpts().ObjCGCBitmapPrint && !buffer.empty()) {
5356 printf("\n%s ivar layout for class '%s': ",
5357 ForStrongLayout ? "strong" : "weak",
5358 OMD->getClassInterface()->getName().str().c_str());
5359 builder.dump(buffer);
5364 llvm::Constant *CGObjCCommonMac::GetMethodVarName(Selector Sel) {
5365 llvm::GlobalVariable *&Entry = MethodVarNames[Sel];
5366 // FIXME: Avoid std::string in "Sel.getAsString()"
5368 Entry = CreateCStringLiteral(Sel.getAsString(), ObjCLabelType::MethodVarName);
5369 return getConstantGEP(VMContext, Entry, 0, 0);
5372 // FIXME: Merge into a single cstring creation function.
5373 llvm::Constant *CGObjCCommonMac::GetMethodVarName(IdentifierInfo *ID) {
5374 return GetMethodVarName(CGM.getContext().Selectors.getNullarySelector(ID));
5377 llvm::Constant *CGObjCCommonMac::GetMethodVarType(const FieldDecl *Field) {
5378 std::string TypeStr;
5379 CGM.getContext().getObjCEncodingForType(Field->getType(), TypeStr, Field);
5381 llvm::GlobalVariable *&Entry = MethodVarTypes[TypeStr];
5383 Entry = CreateCStringLiteral(TypeStr, ObjCLabelType::MethodVarType);
5384 return getConstantGEP(VMContext, Entry, 0, 0);
5387 llvm::Constant *CGObjCCommonMac::GetMethodVarType(const ObjCMethodDecl *D,
5389 std::string TypeStr =
5390 CGM.getContext().getObjCEncodingForMethodDecl(D, Extended);
5392 llvm::GlobalVariable *&Entry = MethodVarTypes[TypeStr];
5394 Entry = CreateCStringLiteral(TypeStr, ObjCLabelType::MethodVarType);
5395 return getConstantGEP(VMContext, Entry, 0, 0);
5398 // FIXME: Merge into a single cstring creation function.
5399 llvm::Constant *CGObjCCommonMac::GetPropertyName(IdentifierInfo *Ident) {
5400 llvm::GlobalVariable *&Entry = PropertyNames[Ident];
5402 Entry = CreateCStringLiteral(Ident->getName(), ObjCLabelType::PropertyName);
5403 return getConstantGEP(VMContext, Entry, 0, 0);
5406 // FIXME: Merge into a single cstring creation function.
5407 // FIXME: This Decl should be more precise.
5409 CGObjCCommonMac::GetPropertyTypeString(const ObjCPropertyDecl *PD,
5410 const Decl *Container) {
5411 std::string TypeStr =
5412 CGM.getContext().getObjCEncodingForPropertyDecl(PD, Container);
5413 return GetPropertyName(&CGM.getContext().Idents.get(TypeStr));
5416 void CGObjCCommonMac::GetNameForMethod(const ObjCMethodDecl *D,
5417 const ObjCContainerDecl *CD,
5418 SmallVectorImpl<char> &Name) {
5419 llvm::raw_svector_ostream OS(Name);
5420 assert (CD && "Missing container decl in GetNameForMethod");
5421 OS << '\01' << (D->isInstanceMethod() ? '-' : '+')
5422 << '[' << CD->getName();
5423 if (const ObjCCategoryImplDecl *CID =
5424 dyn_cast<ObjCCategoryImplDecl>(D->getDeclContext()))
5425 OS << '(' << *CID << ')';
5426 OS << ' ' << D->getSelector().getAsString() << ']';
5429 void CGObjCMac::FinishModule() {
5432 // Emit the dummy bodies for any protocols which were referenced but
5434 for (auto &entry : Protocols) {
5435 llvm::GlobalVariable *global = entry.second;
5436 if (global->hasInitializer())
5439 ConstantInitBuilder builder(CGM);
5440 auto values = builder.beginStruct(ObjCTypes.ProtocolTy);
5441 values.addNullPointer(ObjCTypes.ProtocolExtensionPtrTy);
5442 values.add(GetClassName(entry.first->getName()));
5443 values.addNullPointer(ObjCTypes.ProtocolListPtrTy);
5444 values.addNullPointer(ObjCTypes.MethodDescriptionListPtrTy);
5445 values.addNullPointer(ObjCTypes.MethodDescriptionListPtrTy);
5446 values.finishAndSetAsInitializer(global);
5447 CGM.addCompilerUsedGlobal(global);
5450 // Add assembler directives to add lazy undefined symbol references
5451 // for classes which are referenced but not defined. This is
5452 // important for correct linker interaction.
5454 // FIXME: It would be nice if we had an LLVM construct for this.
5455 if ((!LazySymbols.empty() || !DefinedSymbols.empty()) &&
5456 CGM.getTriple().isOSBinFormatMachO()) {
5457 SmallString<256> Asm;
5458 Asm += CGM.getModule().getModuleInlineAsm();
5459 if (!Asm.empty() && Asm.back() != '\n')
5462 llvm::raw_svector_ostream OS(Asm);
5463 for (const auto *Sym : DefinedSymbols)
5464 OS << "\t.objc_class_name_" << Sym->getName() << "=0\n"
5465 << "\t.globl .objc_class_name_" << Sym->getName() << "\n";
5466 for (const auto *Sym : LazySymbols)
5467 OS << "\t.lazy_reference .objc_class_name_" << Sym->getName() << "\n";
5468 for (const auto &Category : DefinedCategoryNames)
5469 OS << "\t.objc_category_name_" << Category << "=0\n"
5470 << "\t.globl .objc_category_name_" << Category << "\n";
5472 CGM.getModule().setModuleInlineAsm(OS.str());
5476 CGObjCNonFragileABIMac::CGObjCNonFragileABIMac(CodeGen::CodeGenModule &cgm)
5477 : CGObjCCommonMac(cgm), ObjCTypes(cgm), ObjCEmptyCacheVar(nullptr),
5478 ObjCEmptyVtableVar(nullptr) {
5484 ObjCCommonTypesHelper::ObjCCommonTypesHelper(CodeGen::CodeGenModule &cgm)
5485 : VMContext(cgm.getLLVMContext()), CGM(cgm), ExternalProtocolPtrTy(nullptr)
5487 CodeGen::CodeGenTypes &Types = CGM.getTypes();
5488 ASTContext &Ctx = CGM.getContext();
5490 ShortTy = cast<llvm::IntegerType>(Types.ConvertType(Ctx.ShortTy));
5492 LongTy = cast<llvm::IntegerType>(Types.ConvertType(Ctx.LongTy));
5493 Int8PtrTy = CGM.Int8PtrTy;
5494 Int8PtrPtrTy = CGM.Int8PtrPtrTy;
5496 // arm64 targets use "int" ivar offset variables. All others,
5497 // including OS X x86_64 and Windows x86_64, use "long" ivar offsets.
5498 if (CGM.getTarget().getTriple().getArch() == llvm::Triple::aarch64)
5499 IvarOffsetVarTy = IntTy;
5501 IvarOffsetVarTy = LongTy;
5504 cast<llvm::PointerType>(Types.ConvertType(Ctx.getObjCIdType()));
5506 llvm::PointerType::getUnqual(ObjectPtrTy);
5508 cast<llvm::PointerType>(Types.ConvertType(Ctx.getObjCSelType()));
5510 // I'm not sure I like this. The implicit coordination is a bit
5511 // gross. We should solve this in a reasonable fashion because this
5512 // is a pretty common task (match some runtime data structure with
5513 // an LLVM data structure).
5515 // FIXME: This is leaked.
5516 // FIXME: Merge with rewriter code?
5518 // struct _objc_super {
5522 RecordDecl *RD = RecordDecl::Create(Ctx, TTK_Struct,
5523 Ctx.getTranslationUnitDecl(),
5524 SourceLocation(), SourceLocation(),
5525 &Ctx.Idents.get("_objc_super"));
5526 RD->addDecl(FieldDecl::Create(Ctx, RD, SourceLocation(), SourceLocation(),
5527 nullptr, Ctx.getObjCIdType(), nullptr, nullptr,
5528 false, ICIS_NoInit));
5529 RD->addDecl(FieldDecl::Create(Ctx, RD, SourceLocation(), SourceLocation(),
5530 nullptr, Ctx.getObjCClassType(), nullptr,
5531 nullptr, false, ICIS_NoInit));
5532 RD->completeDefinition();
5534 SuperCTy = Ctx.getTagDeclType(RD);
5535 SuperPtrCTy = Ctx.getPointerType(SuperCTy);
5537 SuperTy = cast<llvm::StructType>(Types.ConvertType(SuperCTy));
5538 SuperPtrTy = llvm::PointerType::getUnqual(SuperTy);
5542 // char *attributes;
5544 PropertyTy = llvm::StructType::create("struct._prop_t", Int8PtrTy, Int8PtrTy);
5546 // struct _prop_list_t {
5547 // uint32_t entsize; // sizeof(struct _prop_t)
5548 // uint32_t count_of_properties;
5549 // struct _prop_t prop_list[count_of_properties];
5551 PropertyListTy = llvm::StructType::create(
5552 "struct._prop_list_t", IntTy, IntTy, llvm::ArrayType::get(PropertyTy, 0));
5553 // struct _prop_list_t *
5554 PropertyListPtrTy = llvm::PointerType::getUnqual(PropertyListTy);
5556 // struct _objc_method {
5558 // char *method_type;
5561 MethodTy = llvm::StructType::create("struct._objc_method", SelectorPtrTy,
5562 Int8PtrTy, Int8PtrTy);
5564 // struct _objc_cache *
5565 CacheTy = llvm::StructType::create(VMContext, "struct._objc_cache");
5566 CachePtrTy = llvm::PointerType::getUnqual(CacheTy);
5569 ObjCTypesHelper::ObjCTypesHelper(CodeGen::CodeGenModule &cgm)
5570 : ObjCCommonTypesHelper(cgm) {
5571 // struct _objc_method_description {
5575 MethodDescriptionTy = llvm::StructType::create(
5576 "struct._objc_method_description", SelectorPtrTy, Int8PtrTy);
5578 // struct _objc_method_description_list {
5580 // struct _objc_method_description[1];
5582 MethodDescriptionListTy =
5583 llvm::StructType::create("struct._objc_method_description_list", IntTy,
5584 llvm::ArrayType::get(MethodDescriptionTy, 0));
5586 // struct _objc_method_description_list *
5587 MethodDescriptionListPtrTy =
5588 llvm::PointerType::getUnqual(MethodDescriptionListTy);
5590 // Protocol description structures
5592 // struct _objc_protocol_extension {
5593 // uint32_t size; // sizeof(struct _objc_protocol_extension)
5594 // struct _objc_method_description_list *optional_instance_methods;
5595 // struct _objc_method_description_list *optional_class_methods;
5596 // struct _objc_property_list *instance_properties;
5597 // const char ** extendedMethodTypes;
5598 // struct _objc_property_list *class_properties;
5600 ProtocolExtensionTy = llvm::StructType::create(
5601 "struct._objc_protocol_extension", IntTy, MethodDescriptionListPtrTy,
5602 MethodDescriptionListPtrTy, PropertyListPtrTy, Int8PtrPtrTy,
5605 // struct _objc_protocol_extension *
5606 ProtocolExtensionPtrTy = llvm::PointerType::getUnqual(ProtocolExtensionTy);
5608 // Handle recursive construction of Protocol and ProtocolList types
5611 llvm::StructType::create(VMContext, "struct._objc_protocol");
5614 llvm::StructType::create(VMContext, "struct._objc_protocol_list");
5615 ProtocolListTy->setBody(llvm::PointerType::getUnqual(ProtocolListTy), LongTy,
5616 llvm::ArrayType::get(ProtocolTy, 0));
5618 // struct _objc_protocol {
5619 // struct _objc_protocol_extension *isa;
5620 // char *protocol_name;
5621 // struct _objc_protocol **_objc_protocol_list;
5622 // struct _objc_method_description_list *instance_methods;
5623 // struct _objc_method_description_list *class_methods;
5625 ProtocolTy->setBody(ProtocolExtensionPtrTy, Int8PtrTy,
5626 llvm::PointerType::getUnqual(ProtocolListTy),
5627 MethodDescriptionListPtrTy, MethodDescriptionListPtrTy);
5629 // struct _objc_protocol_list *
5630 ProtocolListPtrTy = llvm::PointerType::getUnqual(ProtocolListTy);
5632 ProtocolPtrTy = llvm::PointerType::getUnqual(ProtocolTy);
5634 // Class description structures
5636 // struct _objc_ivar {
5641 IvarTy = llvm::StructType::create("struct._objc_ivar", Int8PtrTy, Int8PtrTy,
5644 // struct _objc_ivar_list *
5646 llvm::StructType::create(VMContext, "struct._objc_ivar_list");
5647 IvarListPtrTy = llvm::PointerType::getUnqual(IvarListTy);
5649 // struct _objc_method_list *
5651 llvm::StructType::create(VMContext, "struct._objc_method_list");
5652 MethodListPtrTy = llvm::PointerType::getUnqual(MethodListTy);
5654 // struct _objc_class_extension *
5655 ClassExtensionTy = llvm::StructType::create(
5656 "struct._objc_class_extension", IntTy, Int8PtrTy, PropertyListPtrTy);
5657 ClassExtensionPtrTy = llvm::PointerType::getUnqual(ClassExtensionTy);
5659 ClassTy = llvm::StructType::create(VMContext, "struct._objc_class");
5661 // struct _objc_class {
5663 // Class super_class;
5667 // long instance_size;
5668 // struct _objc_ivar_list *ivars;
5669 // struct _objc_method_list *methods;
5670 // struct _objc_cache *cache;
5671 // struct _objc_protocol_list *protocols;
5672 // char *ivar_layout;
5673 // struct _objc_class_ext *ext;
5675 ClassTy->setBody(llvm::PointerType::getUnqual(ClassTy),
5676 llvm::PointerType::getUnqual(ClassTy), Int8PtrTy, LongTy,
5677 LongTy, LongTy, IvarListPtrTy, MethodListPtrTy, CachePtrTy,
5678 ProtocolListPtrTy, Int8PtrTy, ClassExtensionPtrTy);
5680 ClassPtrTy = llvm::PointerType::getUnqual(ClassTy);
5682 // struct _objc_category {
5683 // char *category_name;
5684 // char *class_name;
5685 // struct _objc_method_list *instance_method;
5686 // struct _objc_method_list *class_method;
5687 // struct _objc_protocol_list *protocols;
5688 // uint32_t size; // sizeof(struct _objc_category)
5689 // struct _objc_property_list *instance_properties;// category's @property
5690 // struct _objc_property_list *class_properties;
5692 CategoryTy = llvm::StructType::create(
5693 "struct._objc_category", Int8PtrTy, Int8PtrTy, MethodListPtrTy,
5694 MethodListPtrTy, ProtocolListPtrTy, IntTy, PropertyListPtrTy,
5697 // Global metadata structures
5699 // struct _objc_symtab {
5700 // long sel_ref_cnt;
5702 // short cls_def_cnt;
5703 // short cat_def_cnt;
5704 // char *defs[cls_def_cnt + cat_def_cnt];
5706 SymtabTy = llvm::StructType::create("struct._objc_symtab", LongTy,
5707 SelectorPtrTy, ShortTy, ShortTy,
5708 llvm::ArrayType::get(Int8PtrTy, 0));
5709 SymtabPtrTy = llvm::PointerType::getUnqual(SymtabTy);
5711 // struct _objc_module {
5713 // long size; // sizeof(struct _objc_module)
5715 // struct _objc_symtab* symtab;
5717 ModuleTy = llvm::StructType::create("struct._objc_module", LongTy, LongTy,
5718 Int8PtrTy, SymtabPtrTy);
5720 // FIXME: This is the size of the setjmp buffer and should be target
5721 // specific. 18 is what's used on 32-bit X86.
5722 uint64_t SetJmpBufferSize = 18;
5725 llvm::Type *StackPtrTy = llvm::ArrayType::get(CGM.Int8PtrTy, 4);
5727 ExceptionDataTy = llvm::StructType::create(
5728 "struct._objc_exception_data",
5729 llvm::ArrayType::get(CGM.Int32Ty, SetJmpBufferSize), StackPtrTy);
5732 ObjCNonFragileABITypesHelper::ObjCNonFragileABITypesHelper(CodeGen::CodeGenModule &cgm)
5733 : ObjCCommonTypesHelper(cgm) {
5734 // struct _method_list_t {
5735 // uint32_t entsize; // sizeof(struct _objc_method)
5736 // uint32_t method_count;
5737 // struct _objc_method method_list[method_count];
5740 llvm::StructType::create("struct.__method_list_t", IntTy, IntTy,
5741 llvm::ArrayType::get(MethodTy, 0));
5742 // struct method_list_t *
5743 MethodListnfABIPtrTy = llvm::PointerType::getUnqual(MethodListnfABITy);
5745 // struct _protocol_t {
5747 // const char * const protocol_name;
5748 // const struct _protocol_list_t * protocol_list; // super protocols
5749 // const struct method_list_t * const instance_methods;
5750 // const struct method_list_t * const class_methods;
5751 // const struct method_list_t *optionalInstanceMethods;
5752 // const struct method_list_t *optionalClassMethods;
5753 // const struct _prop_list_t * properties;
5754 // const uint32_t size; // sizeof(struct _protocol_t)
5755 // const uint32_t flags; // = 0
5756 // const char ** extendedMethodTypes;
5757 // const char *demangledName;
5758 // const struct _prop_list_t * class_properties;
5761 // Holder for struct _protocol_list_t *
5762 ProtocolListnfABITy =
5763 llvm::StructType::create(VMContext, "struct._objc_protocol_list");
5765 ProtocolnfABITy = llvm::StructType::create(
5766 "struct._protocol_t", ObjectPtrTy, Int8PtrTy,
5767 llvm::PointerType::getUnqual(ProtocolListnfABITy), MethodListnfABIPtrTy,
5768 MethodListnfABIPtrTy, MethodListnfABIPtrTy, MethodListnfABIPtrTy,
5769 PropertyListPtrTy, IntTy, IntTy, Int8PtrPtrTy, Int8PtrTy,
5772 // struct _protocol_t*
5773 ProtocolnfABIPtrTy = llvm::PointerType::getUnqual(ProtocolnfABITy);
5775 // struct _protocol_list_t {
5776 // long protocol_count; // Note, this is 32/64 bit
5777 // struct _protocol_t *[protocol_count];
5779 ProtocolListnfABITy->setBody(LongTy,
5780 llvm::ArrayType::get(ProtocolnfABIPtrTy, 0));
5782 // struct _objc_protocol_list*
5783 ProtocolListnfABIPtrTy = llvm::PointerType::getUnqual(ProtocolListnfABITy);
5786 // unsigned [long] int *offset; // pointer to ivar offset location
5789 // uint32_t alignment;
5792 IvarnfABITy = llvm::StructType::create(
5793 "struct._ivar_t", llvm::PointerType::getUnqual(IvarOffsetVarTy),
5794 Int8PtrTy, Int8PtrTy, IntTy, IntTy);
5796 // struct _ivar_list_t {
5797 // uint32 entsize; // sizeof(struct _ivar_t)
5799 // struct _iver_t list[count];
5802 llvm::StructType::create("struct._ivar_list_t", IntTy, IntTy,
5803 llvm::ArrayType::get(IvarnfABITy, 0));
5805 IvarListnfABIPtrTy = llvm::PointerType::getUnqual(IvarListnfABITy);
5807 // struct _class_ro_t {
5808 // uint32_t const flags;
5809 // uint32_t const instanceStart;
5810 // uint32_t const instanceSize;
5811 // uint32_t const reserved; // only when building for 64bit targets
5812 // const uint8_t * const ivarLayout;
5813 // const char *const name;
5814 // const struct _method_list_t * const baseMethods;
5815 // const struct _objc_protocol_list *const baseProtocols;
5816 // const struct _ivar_list_t *const ivars;
5817 // const uint8_t * const weakIvarLayout;
5818 // const struct _prop_list_t * const properties;
5821 // FIXME. Add 'reserved' field in 64bit abi mode!
5822 ClassRonfABITy = llvm::StructType::create(
5823 "struct._class_ro_t", IntTy, IntTy, IntTy, Int8PtrTy, Int8PtrTy,
5824 MethodListnfABIPtrTy, ProtocolListnfABIPtrTy, IvarListnfABIPtrTy,
5825 Int8PtrTy, PropertyListPtrTy);
5827 // ImpnfABITy - LLVM for id (*)(id, SEL, ...)
5828 llvm::Type *params[] = { ObjectPtrTy, SelectorPtrTy };
5829 ImpnfABITy = llvm::FunctionType::get(ObjectPtrTy, params, false)
5832 // struct _class_t {
5833 // struct _class_t *isa;
5834 // struct _class_t * const superclass;
5837 // struct class_ro_t *ro;
5840 ClassnfABITy = llvm::StructType::create(VMContext, "struct._class_t");
5841 ClassnfABITy->setBody(llvm::PointerType::getUnqual(ClassnfABITy),
5842 llvm::PointerType::getUnqual(ClassnfABITy), CachePtrTy,
5843 llvm::PointerType::getUnqual(ImpnfABITy),
5844 llvm::PointerType::getUnqual(ClassRonfABITy));
5846 // LLVM for struct _class_t *
5847 ClassnfABIPtrTy = llvm::PointerType::getUnqual(ClassnfABITy);
5849 // struct _category_t {
5850 // const char * const name;
5851 // struct _class_t *const cls;
5852 // const struct _method_list_t * const instance_methods;
5853 // const struct _method_list_t * const class_methods;
5854 // const struct _protocol_list_t * const protocols;
5855 // const struct _prop_list_t * const properties;
5856 // const struct _prop_list_t * const class_properties;
5857 // const uint32_t size;
5859 CategorynfABITy = llvm::StructType::create(
5860 "struct._category_t", Int8PtrTy, ClassnfABIPtrTy, MethodListnfABIPtrTy,
5861 MethodListnfABIPtrTy, ProtocolListnfABIPtrTy, PropertyListPtrTy,
5862 PropertyListPtrTy, IntTy);
5864 // New types for nonfragile abi messaging.
5865 CodeGen::CodeGenTypes &Types = CGM.getTypes();
5866 ASTContext &Ctx = CGM.getContext();
5868 // MessageRefTy - LLVM for:
5869 // struct _message_ref_t {
5874 // First the clang type for struct _message_ref_t
5875 RecordDecl *RD = RecordDecl::Create(Ctx, TTK_Struct,
5876 Ctx.getTranslationUnitDecl(),
5877 SourceLocation(), SourceLocation(),
5878 &Ctx.Idents.get("_message_ref_t"));
5879 RD->addDecl(FieldDecl::Create(Ctx, RD, SourceLocation(), SourceLocation(),
5880 nullptr, Ctx.VoidPtrTy, nullptr, nullptr, false,
5882 RD->addDecl(FieldDecl::Create(Ctx, RD, SourceLocation(), SourceLocation(),
5883 nullptr, Ctx.getObjCSelType(), nullptr, nullptr,
5884 false, ICIS_NoInit));
5885 RD->completeDefinition();
5887 MessageRefCTy = Ctx.getTagDeclType(RD);
5888 MessageRefCPtrTy = Ctx.getPointerType(MessageRefCTy);
5889 MessageRefTy = cast<llvm::StructType>(Types.ConvertType(MessageRefCTy));
5891 // MessageRefPtrTy - LLVM for struct _message_ref_t*
5892 MessageRefPtrTy = llvm::PointerType::getUnqual(MessageRefTy);
5894 // SuperMessageRefTy - LLVM for:
5895 // struct _super_message_ref_t {
5896 // SUPER_IMP messenger;
5899 SuperMessageRefTy = llvm::StructType::create("struct._super_message_ref_t",
5900 ImpnfABITy, SelectorPtrTy);
5902 // SuperMessageRefPtrTy - LLVM for struct _super_message_ref_t*
5903 SuperMessageRefPtrTy = llvm::PointerType::getUnqual(SuperMessageRefTy);
5906 // struct objc_typeinfo {
5907 // const void** vtable; // objc_ehtype_vtable + 2
5908 // const char* name; // c++ typeinfo string
5911 EHTypeTy = llvm::StructType::create("struct._objc_typeinfo",
5912 llvm::PointerType::getUnqual(Int8PtrTy),
5913 Int8PtrTy, ClassnfABIPtrTy);
5914 EHTypePtrTy = llvm::PointerType::getUnqual(EHTypeTy);
5917 llvm::Function *CGObjCNonFragileABIMac::ModuleInitFunction() {
5918 FinishNonFragileABIModule();
5923 void CGObjCNonFragileABIMac::AddModuleClassList(
5924 ArrayRef<llvm::GlobalValue *> Container, StringRef SymbolName,
5925 StringRef SectionName) {
5926 unsigned NumClasses = Container.size();
5931 SmallVector<llvm::Constant*, 8> Symbols(NumClasses);
5932 for (unsigned i=0; i<NumClasses; i++)
5933 Symbols[i] = llvm::ConstantExpr::getBitCast(Container[i],
5934 ObjCTypes.Int8PtrTy);
5935 llvm::Constant *Init =
5936 llvm::ConstantArray::get(llvm::ArrayType::get(ObjCTypes.Int8PtrTy,
5940 llvm::GlobalVariable *GV =
5941 new llvm::GlobalVariable(CGM.getModule(), Init->getType(), false,
5942 llvm::GlobalValue::PrivateLinkage,
5945 GV->setAlignment(CGM.getDataLayout().getABITypeAlignment(Init->getType()));
5946 GV->setSection(SectionName);
5947 CGM.addCompilerUsedGlobal(GV);
5950 void CGObjCNonFragileABIMac::FinishNonFragileABIModule() {
5951 // nonfragile abi has no module definition.
5953 // Build list of all implemented class addresses in array
5954 // L_OBJC_LABEL_CLASS_$.
5956 for (unsigned i=0, NumClasses=ImplementedClasses.size(); i<NumClasses; i++) {
5957 const ObjCInterfaceDecl *ID = ImplementedClasses[i];
5959 if (ObjCImplementationDecl *IMP = ID->getImplementation())
5960 // We are implementing a weak imported interface. Give it external linkage
5961 if (ID->isWeakImported() && !IMP->isWeakImported()) {
5962 DefinedClasses[i]->setLinkage(llvm::GlobalVariable::ExternalLinkage);
5963 DefinedMetaClasses[i]->setLinkage(llvm::GlobalVariable::ExternalLinkage);
5967 AddModuleClassList(DefinedClasses, "OBJC_LABEL_CLASS_$",
5968 GetSectionName("__objc_classlist",
5969 "regular,no_dead_strip"));
5971 AddModuleClassList(DefinedNonLazyClasses, "OBJC_LABEL_NONLAZY_CLASS_$",
5972 GetSectionName("__objc_nlclslist",
5973 "regular,no_dead_strip"));
5975 // Build list of all implemented category addresses in array
5976 // L_OBJC_LABEL_CATEGORY_$.
5977 AddModuleClassList(DefinedCategories, "OBJC_LABEL_CATEGORY_$",
5978 GetSectionName("__objc_catlist",
5979 "regular,no_dead_strip"));
5980 AddModuleClassList(DefinedNonLazyCategories, "OBJC_LABEL_NONLAZY_CATEGORY_$",
5981 GetSectionName("__objc_nlcatlist",
5982 "regular,no_dead_strip"));
5987 /// isVTableDispatchedSelector - Returns true if SEL is not in the list of
5988 /// VTableDispatchMethods; false otherwise. What this means is that
5989 /// except for the 19 selectors in the list, we generate 32bit-style
5990 /// message dispatch call for all the rest.
5991 bool CGObjCNonFragileABIMac::isVTableDispatchedSelector(Selector Sel) {
5992 // At various points we've experimented with using vtable-based
5993 // dispatch for all methods.
5994 switch (CGM.getCodeGenOpts().getObjCDispatchMethod()) {
5995 case CodeGenOptions::Legacy:
5997 case CodeGenOptions::NonLegacy:
5999 case CodeGenOptions::Mixed:
6003 // If so, see whether this selector is in the white-list of things which must
6004 // use the new dispatch convention. We lazily build a dense set for this.
6005 if (VTableDispatchMethods.empty()) {
6006 VTableDispatchMethods.insert(GetNullarySelector("alloc"));
6007 VTableDispatchMethods.insert(GetNullarySelector("class"));
6008 VTableDispatchMethods.insert(GetNullarySelector("self"));
6009 VTableDispatchMethods.insert(GetNullarySelector("isFlipped"));
6010 VTableDispatchMethods.insert(GetNullarySelector("length"));
6011 VTableDispatchMethods.insert(GetNullarySelector("count"));
6013 // These are vtable-based if GC is disabled.
6014 // Optimistically use vtable dispatch for hybrid compiles.
6015 if (CGM.getLangOpts().getGC() != LangOptions::GCOnly) {
6016 VTableDispatchMethods.insert(GetNullarySelector("retain"));
6017 VTableDispatchMethods.insert(GetNullarySelector("release"));
6018 VTableDispatchMethods.insert(GetNullarySelector("autorelease"));
6021 VTableDispatchMethods.insert(GetUnarySelector("allocWithZone"));
6022 VTableDispatchMethods.insert(GetUnarySelector("isKindOfClass"));
6023 VTableDispatchMethods.insert(GetUnarySelector("respondsToSelector"));
6024 VTableDispatchMethods.insert(GetUnarySelector("objectForKey"));
6025 VTableDispatchMethods.insert(GetUnarySelector("objectAtIndex"));
6026 VTableDispatchMethods.insert(GetUnarySelector("isEqualToString"));
6027 VTableDispatchMethods.insert(GetUnarySelector("isEqual"));
6029 // These are vtable-based if GC is enabled.
6030 // Optimistically use vtable dispatch for hybrid compiles.
6031 if (CGM.getLangOpts().getGC() != LangOptions::NonGC) {
6032 VTableDispatchMethods.insert(GetNullarySelector("hash"));
6033 VTableDispatchMethods.insert(GetUnarySelector("addObject"));
6035 // "countByEnumeratingWithState:objects:count"
6036 IdentifierInfo *KeyIdents[] = {
6037 &CGM.getContext().Idents.get("countByEnumeratingWithState"),
6038 &CGM.getContext().Idents.get("objects"),
6039 &CGM.getContext().Idents.get("count")
6041 VTableDispatchMethods.insert(
6042 CGM.getContext().Selectors.getSelector(3, KeyIdents));
6046 return VTableDispatchMethods.count(Sel);
6049 /// BuildClassRoTInitializer - generate meta-data for:
6050 /// struct _class_ro_t {
6051 /// uint32_t const flags;
6052 /// uint32_t const instanceStart;
6053 /// uint32_t const instanceSize;
6054 /// uint32_t const reserved; // only when building for 64bit targets
6055 /// const uint8_t * const ivarLayout;
6056 /// const char *const name;
6057 /// const struct _method_list_t * const baseMethods;
6058 /// const struct _protocol_list_t *const baseProtocols;
6059 /// const struct _ivar_list_t *const ivars;
6060 /// const uint8_t * const weakIvarLayout;
6061 /// const struct _prop_list_t * const properties;
6064 llvm::GlobalVariable * CGObjCNonFragileABIMac::BuildClassRoTInitializer(
6066 unsigned InstanceStart,
6067 unsigned InstanceSize,
6068 const ObjCImplementationDecl *ID) {
6069 std::string ClassName = ID->getObjCRuntimeNameAsString();
6071 CharUnits beginInstance = CharUnits::fromQuantity(InstanceStart);
6072 CharUnits endInstance = CharUnits::fromQuantity(InstanceSize);
6074 bool hasMRCWeak = false;
6075 if (CGM.getLangOpts().ObjCAutoRefCount)
6076 flags |= NonFragileABI_Class_CompiledByARC;
6077 else if ((hasMRCWeak = hasMRCWeakIvars(CGM, ID)))
6078 flags |= NonFragileABI_Class_HasMRCWeakIvars;
6080 ConstantInitBuilder builder(CGM);
6081 auto values = builder.beginStruct(ObjCTypes.ClassRonfABITy);
6083 values.addInt(ObjCTypes.IntTy, flags);
6084 values.addInt(ObjCTypes.IntTy, InstanceStart);
6085 values.addInt(ObjCTypes.IntTy, InstanceSize);
6086 values.add((flags & NonFragileABI_Class_Meta)
6087 ? GetIvarLayoutName(nullptr, ObjCTypes)
6088 : BuildStrongIvarLayout(ID, beginInstance, endInstance));
6089 values.add(GetClassName(ID->getObjCRuntimeNameAsString()));
6091 // const struct _method_list_t * const baseMethods;
6092 SmallVector<const ObjCMethodDecl*, 16> methods;
6093 if (flags & NonFragileABI_Class_Meta) {
6094 for (const auto *MD : ID->class_methods())
6095 methods.push_back(MD);
6097 for (const auto *MD : ID->instance_methods())
6098 methods.push_back(MD);
6100 for (const auto *PID : ID->property_impls()) {
6101 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize){
6102 ObjCPropertyDecl *PD = PID->getPropertyDecl();
6104 if (auto MD = PD->getGetterMethodDecl())
6105 if (GetMethodDefinition(MD))
6106 methods.push_back(MD);
6107 if (auto MD = PD->getSetterMethodDecl())
6108 if (GetMethodDefinition(MD))
6109 methods.push_back(MD);
6114 values.add(emitMethodList(ID->getObjCRuntimeNameAsString(),
6115 (flags & NonFragileABI_Class_Meta)
6116 ? MethodListType::ClassMethods
6117 : MethodListType::InstanceMethods,
6120 const ObjCInterfaceDecl *OID = ID->getClassInterface();
6121 assert(OID && "CGObjCNonFragileABIMac::BuildClassRoTInitializer");
6122 values.add(EmitProtocolList("\01l_OBJC_CLASS_PROTOCOLS_$_"
6123 + OID->getObjCRuntimeNameAsString(),
6124 OID->all_referenced_protocol_begin(),
6125 OID->all_referenced_protocol_end()));
6127 if (flags & NonFragileABI_Class_Meta) {
6128 values.addNullPointer(ObjCTypes.IvarListnfABIPtrTy);
6129 values.add(GetIvarLayoutName(nullptr, ObjCTypes));
6130 values.add(EmitPropertyList(
6131 "\01l_OBJC_$_CLASS_PROP_LIST_" + ID->getObjCRuntimeNameAsString(),
6132 ID, ID->getClassInterface(), ObjCTypes, true));
6134 values.add(EmitIvarList(ID));
6135 values.add(BuildWeakIvarLayout(ID, beginInstance, endInstance, hasMRCWeak));
6136 values.add(EmitPropertyList(
6137 "\01l_OBJC_$_PROP_LIST_" + ID->getObjCRuntimeNameAsString(),
6138 ID, ID->getClassInterface(), ObjCTypes, false));
6141 llvm::SmallString<64> roLabel;
6142 llvm::raw_svector_ostream(roLabel)
6143 << ((flags & NonFragileABI_Class_Meta) ? "\01l_OBJC_METACLASS_RO_$_"
6144 : "\01l_OBJC_CLASS_RO_$_")
6147 llvm::GlobalVariable *CLASS_RO_GV =
6148 values.finishAndCreateGlobal(roLabel, CGM.getPointerAlign(),
6150 llvm::GlobalValue::PrivateLinkage);
6151 if (CGM.getTriple().isOSBinFormatMachO())
6152 CLASS_RO_GV->setSection("__DATA, __objc_const");
6156 /// Build the metaclass object for a class.
6158 /// struct _class_t {
6159 /// struct _class_t *isa;
6160 /// struct _class_t * const superclass;
6163 /// struct class_ro_t *ro;
6166 llvm::GlobalVariable *
6167 CGObjCNonFragileABIMac::BuildClassObject(const ObjCInterfaceDecl *CI,
6169 llvm::Constant *IsAGV,
6170 llvm::Constant *SuperClassGV,
6171 llvm::Constant *ClassRoGV,
6172 bool HiddenVisibility) {
6173 ConstantInitBuilder builder(CGM);
6174 auto values = builder.beginStruct(ObjCTypes.ClassnfABITy);
6177 values.add(SuperClassGV);
6179 values.addNullPointer(ObjCTypes.ClassnfABIPtrTy);
6181 values.add(ObjCEmptyCacheVar);
6182 values.add(ObjCEmptyVtableVar);
6183 values.add(ClassRoGV);
6185 llvm::GlobalVariable *GV =
6186 cast<llvm::GlobalVariable>(GetClassGlobal(CI, isMetaclass, ForDefinition));
6187 values.finishAndSetAsInitializer(GV);
6189 if (CGM.getTriple().isOSBinFormatMachO())
6190 GV->setSection("__DATA, __objc_data");
6192 CGM.getDataLayout().getABITypeAlignment(ObjCTypes.ClassnfABITy));
6193 if (!CGM.getTriple().isOSBinFormatCOFF())
6194 if (HiddenVisibility)
6195 GV->setVisibility(llvm::GlobalValue::HiddenVisibility);
6200 CGObjCNonFragileABIMac::ImplementationIsNonLazy(const ObjCImplDecl *OD) const {
6201 return OD->getClassMethod(GetNullarySelector("load")) != nullptr;
6204 void CGObjCNonFragileABIMac::GetClassSizeInfo(const ObjCImplementationDecl *OID,
6205 uint32_t &InstanceStart,
6206 uint32_t &InstanceSize) {
6207 const ASTRecordLayout &RL =
6208 CGM.getContext().getASTObjCImplementationLayout(OID);
6210 // InstanceSize is really instance end.
6211 InstanceSize = RL.getDataSize().getQuantity();
6213 // If there are no fields, the start is the same as the end.
6214 if (!RL.getFieldCount())
6215 InstanceStart = InstanceSize;
6217 InstanceStart = RL.getFieldOffset(0) / CGM.getContext().getCharWidth();
6220 static llvm::GlobalValue::DLLStorageClassTypes getStorage(CodeGenModule &CGM,
6222 IdentifierInfo &II = CGM.getContext().Idents.get(Name);
6223 TranslationUnitDecl *TUDecl = CGM.getContext().getTranslationUnitDecl();
6224 DeclContext *DC = TranslationUnitDecl::castToDeclContext(TUDecl);
6226 const VarDecl *VD = nullptr;
6227 for (const auto &Result : DC->lookup(&II))
6228 if ((VD = dyn_cast<VarDecl>(Result)))
6232 return llvm::GlobalValue::DLLImportStorageClass;
6233 if (VD->hasAttr<DLLExportAttr>())
6234 return llvm::GlobalValue::DLLExportStorageClass;
6235 if (VD->hasAttr<DLLImportAttr>())
6236 return llvm::GlobalValue::DLLImportStorageClass;
6237 return llvm::GlobalValue::DefaultStorageClass;
6240 void CGObjCNonFragileABIMac::GenerateClass(const ObjCImplementationDecl *ID) {
6241 if (!ObjCEmptyCacheVar) {
6243 new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.CacheTy, false,
6244 llvm::GlobalValue::ExternalLinkage, nullptr,
6245 "_objc_empty_cache");
6246 if (CGM.getTriple().isOSBinFormatCOFF())
6247 ObjCEmptyCacheVar->setDLLStorageClass(getStorage(CGM, "_objc_empty_cache"));
6249 // Only OS X with deployment version <10.9 use the empty vtable symbol
6250 const llvm::Triple &Triple = CGM.getTarget().getTriple();
6251 if (Triple.isMacOSX() && Triple.isMacOSXVersionLT(10, 9))
6252 ObjCEmptyVtableVar =
6253 new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.ImpnfABITy, false,
6254 llvm::GlobalValue::ExternalLinkage, nullptr,
6255 "_objc_empty_vtable");
6257 ObjCEmptyVtableVar =
6258 llvm::ConstantPointerNull::get(ObjCTypes.ImpnfABITy->getPointerTo());
6261 // FIXME: Is this correct (that meta class size is never computed)?
6262 uint32_t InstanceStart =
6263 CGM.getDataLayout().getTypeAllocSize(ObjCTypes.ClassnfABITy);
6264 uint32_t InstanceSize = InstanceStart;
6265 uint32_t flags = NonFragileABI_Class_Meta;
6267 llvm::Constant *SuperClassGV, *IsAGV;
6269 const auto *CI = ID->getClassInterface();
6270 assert(CI && "CGObjCNonFragileABIMac::GenerateClass - class is 0");
6272 // Build the flags for the metaclass.
6273 bool classIsHidden = (CGM.getTriple().isOSBinFormatCOFF())
6274 ? !CI->hasAttr<DLLExportAttr>()
6275 : CI->getVisibility() == HiddenVisibility;
6277 flags |= NonFragileABI_Class_Hidden;
6279 // FIXME: why is this flag set on the metaclass?
6280 // ObjC metaclasses have no fields and don't really get constructed.
6281 if (ID->hasNonZeroConstructors() || ID->hasDestructors()) {
6282 flags |= NonFragileABI_Class_HasCXXStructors;
6283 if (!ID->hasNonZeroConstructors())
6284 flags |= NonFragileABI_Class_HasCXXDestructorOnly;
6287 if (!CI->getSuperClass()) {
6289 flags |= NonFragileABI_Class_Root;
6291 SuperClassGV = GetClassGlobal(CI, /*metaclass*/ false, NotForDefinition);
6292 IsAGV = GetClassGlobal(CI, /*metaclass*/ true, NotForDefinition);
6294 // Has a root. Current class is not a root.
6295 const ObjCInterfaceDecl *Root = ID->getClassInterface();
6296 while (const ObjCInterfaceDecl *Super = Root->getSuperClass())
6299 const auto *Super = CI->getSuperClass();
6300 IsAGV = GetClassGlobal(Root, /*metaclass*/ true, NotForDefinition);
6301 SuperClassGV = GetClassGlobal(Super, /*metaclass*/ true, NotForDefinition);
6304 llvm::GlobalVariable *CLASS_RO_GV =
6305 BuildClassRoTInitializer(flags, InstanceStart, InstanceSize, ID);
6307 llvm::GlobalVariable *MetaTClass =
6308 BuildClassObject(CI, /*metaclass*/ true,
6309 IsAGV, SuperClassGV, CLASS_RO_GV, classIsHidden);
6310 if (CGM.getTriple().isOSBinFormatCOFF())
6311 if (CI->hasAttr<DLLExportAttr>())
6312 MetaTClass->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
6313 DefinedMetaClasses.push_back(MetaTClass);
6315 // Metadata for the class
6318 flags |= NonFragileABI_Class_Hidden;
6320 if (ID->hasNonZeroConstructors() || ID->hasDestructors()) {
6321 flags |= NonFragileABI_Class_HasCXXStructors;
6323 // Set a flag to enable a runtime optimization when a class has
6324 // fields that require destruction but which don't require
6325 // anything except zero-initialization during construction. This
6326 // is most notably true of __strong and __weak types, but you can
6327 // also imagine there being C++ types with non-trivial default
6328 // constructors that merely set all fields to null.
6329 if (!ID->hasNonZeroConstructors())
6330 flags |= NonFragileABI_Class_HasCXXDestructorOnly;
6333 if (hasObjCExceptionAttribute(CGM.getContext(), CI))
6334 flags |= NonFragileABI_Class_Exception;
6336 if (!CI->getSuperClass()) {
6337 flags |= NonFragileABI_Class_Root;
6338 SuperClassGV = nullptr;
6340 // Has a root. Current class is not a root.
6341 const auto *Super = CI->getSuperClass();
6342 SuperClassGV = GetClassGlobal(Super, /*metaclass*/ false, NotForDefinition);
6345 GetClassSizeInfo(ID, InstanceStart, InstanceSize);
6347 BuildClassRoTInitializer(flags, InstanceStart, InstanceSize, ID);
6349 llvm::GlobalVariable *ClassMD =
6350 BuildClassObject(CI, /*metaclass*/ false,
6351 MetaTClass, SuperClassGV, CLASS_RO_GV, classIsHidden);
6352 if (CGM.getTriple().isOSBinFormatCOFF())
6353 if (CI->hasAttr<DLLExportAttr>())
6354 ClassMD->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
6355 DefinedClasses.push_back(ClassMD);
6356 ImplementedClasses.push_back(CI);
6358 // Determine if this class is also "non-lazy".
6359 if (ImplementationIsNonLazy(ID))
6360 DefinedNonLazyClasses.push_back(ClassMD);
6362 // Force the definition of the EHType if necessary.
6363 if (flags & NonFragileABI_Class_Exception)
6364 (void) GetInterfaceEHType(CI, ForDefinition);
6365 // Make sure method definition entries are all clear for next implementation.
6366 MethodDefinitions.clear();
6369 /// GenerateProtocolRef - This routine is called to generate code for
6370 /// a protocol reference expression; as in:
6372 /// @protocol(Proto1);
6374 /// It generates a weak reference to l_OBJC_PROTOCOL_REFERENCE_$_Proto1
6375 /// which will hold address of the protocol meta-data.
6377 llvm::Value *CGObjCNonFragileABIMac::GenerateProtocolRef(CodeGenFunction &CGF,
6378 const ObjCProtocolDecl *PD) {
6380 // This routine is called for @protocol only. So, we must build definition
6381 // of protocol's meta-data (not a reference to it!)
6383 llvm::Constant *Init =
6384 llvm::ConstantExpr::getBitCast(GetOrEmitProtocol(PD),
6385 ObjCTypes.getExternalProtocolPtrTy());
6387 std::string ProtocolName("\01l_OBJC_PROTOCOL_REFERENCE_$_");
6388 ProtocolName += PD->getObjCRuntimeNameAsString();
6390 CharUnits Align = CGF.getPointerAlign();
6392 llvm::GlobalVariable *PTGV = CGM.getModule().getGlobalVariable(ProtocolName);
6394 return CGF.Builder.CreateAlignedLoad(PTGV, Align);
6395 PTGV = new llvm::GlobalVariable(CGM.getModule(), Init->getType(), false,
6396 llvm::GlobalValue::WeakAnyLinkage, Init,
6398 PTGV->setSection(GetSectionName("__objc_protorefs",
6399 "coalesced,no_dead_strip"));
6400 PTGV->setVisibility(llvm::GlobalValue::HiddenVisibility);
6401 PTGV->setAlignment(Align.getQuantity());
6402 if (!CGM.getTriple().isOSBinFormatMachO())
6403 PTGV->setComdat(CGM.getModule().getOrInsertComdat(ProtocolName));
6404 CGM.addCompilerUsedGlobal(PTGV);
6405 return CGF.Builder.CreateAlignedLoad(PTGV, Align);
6408 /// GenerateCategory - Build metadata for a category implementation.
6409 /// struct _category_t {
6410 /// const char * const name;
6411 /// struct _class_t *const cls;
6412 /// const struct _method_list_t * const instance_methods;
6413 /// const struct _method_list_t * const class_methods;
6414 /// const struct _protocol_list_t * const protocols;
6415 /// const struct _prop_list_t * const properties;
6416 /// const struct _prop_list_t * const class_properties;
6417 /// const uint32_t size;
6420 void CGObjCNonFragileABIMac::GenerateCategory(const ObjCCategoryImplDecl *OCD) {
6421 const ObjCInterfaceDecl *Interface = OCD->getClassInterface();
6422 const char *Prefix = "\01l_OBJC_$_CATEGORY_";
6424 llvm::SmallString<64> ExtCatName(Prefix);
6425 ExtCatName += Interface->getObjCRuntimeNameAsString();
6426 ExtCatName += "_$_";
6427 ExtCatName += OCD->getNameAsString();
6429 ConstantInitBuilder builder(CGM);
6430 auto values = builder.beginStruct(ObjCTypes.CategorynfABITy);
6431 values.add(GetClassName(OCD->getIdentifier()->getName()));
6432 // meta-class entry symbol
6433 values.add(GetClassGlobal(Interface, /*metaclass*/ false, NotForDefinition));
6434 std::string listName =
6435 (Interface->getObjCRuntimeNameAsString() + "_$_" + OCD->getName()).str();
6437 SmallVector<const ObjCMethodDecl *, 16> instanceMethods;
6438 SmallVector<const ObjCMethodDecl *, 8> classMethods;
6439 for (const auto *MD : OCD->methods()) {
6440 if (MD->isInstanceMethod()) {
6441 instanceMethods.push_back(MD);
6443 classMethods.push_back(MD);
6447 values.add(emitMethodList(listName, MethodListType::CategoryInstanceMethods,
6449 values.add(emitMethodList(listName, MethodListType::CategoryClassMethods,
6452 const ObjCCategoryDecl *Category =
6453 Interface->FindCategoryDeclaration(OCD->getIdentifier());
6455 SmallString<256> ExtName;
6456 llvm::raw_svector_ostream(ExtName) << Interface->getObjCRuntimeNameAsString() << "_$_"
6458 values.add(EmitProtocolList("\01l_OBJC_CATEGORY_PROTOCOLS_$_"
6459 + Interface->getObjCRuntimeNameAsString() + "_$_"
6460 + Category->getName(),
6461 Category->protocol_begin(),
6462 Category->protocol_end()));
6463 values.add(EmitPropertyList("\01l_OBJC_$_PROP_LIST_" + ExtName.str(),
6464 OCD, Category, ObjCTypes, false));
6465 values.add(EmitPropertyList("\01l_OBJC_$_CLASS_PROP_LIST_" + ExtName.str(),
6466 OCD, Category, ObjCTypes, true));
6468 values.addNullPointer(ObjCTypes.ProtocolListnfABIPtrTy);
6469 values.addNullPointer(ObjCTypes.PropertyListPtrTy);
6470 values.addNullPointer(ObjCTypes.PropertyListPtrTy);
6473 unsigned Size = CGM.getDataLayout().getTypeAllocSize(ObjCTypes.CategorynfABITy);
6474 values.addInt(ObjCTypes.IntTy, Size);
6476 llvm::GlobalVariable *GCATV =
6477 values.finishAndCreateGlobal(ExtCatName.str(), CGM.getPointerAlign(),
6479 llvm::GlobalValue::PrivateLinkage);
6480 if (CGM.getTriple().isOSBinFormatMachO())
6481 GCATV->setSection("__DATA, __objc_const");
6482 CGM.addCompilerUsedGlobal(GCATV);
6483 DefinedCategories.push_back(GCATV);
6485 // Determine if this category is also "non-lazy".
6486 if (ImplementationIsNonLazy(OCD))
6487 DefinedNonLazyCategories.push_back(GCATV);
6488 // method definition entries must be clear for next implementation.
6489 MethodDefinitions.clear();
6492 /// emitMethodConstant - Return a struct objc_method constant. If
6493 /// forProtocol is true, the implementation will be null; otherwise,
6494 /// the method must have a definition registered with the runtime.
6496 /// struct _objc_method {
6498 /// char *method_type;
6501 void CGObjCNonFragileABIMac::emitMethodConstant(ConstantArrayBuilder &builder,
6502 const ObjCMethodDecl *MD,
6504 auto method = builder.beginStruct(ObjCTypes.MethodTy);
6505 method.addBitCast(GetMethodVarName(MD->getSelector()),
6506 ObjCTypes.SelectorPtrTy);
6507 method.add(GetMethodVarType(MD));
6510 // Protocol methods have no implementation. So, this entry is always NULL.
6511 method.addNullPointer(ObjCTypes.Int8PtrTy);
6513 llvm::Function *fn = GetMethodDefinition(MD);
6514 assert(fn && "no definition for method?");
6515 method.addBitCast(fn, ObjCTypes.Int8PtrTy);
6518 method.finishAndAddTo(builder);
6521 /// Build meta-data for method declarations.
6523 /// struct _method_list_t {
6524 /// uint32_t entsize; // sizeof(struct _objc_method)
6525 /// uint32_t method_count;
6526 /// struct _objc_method method_list[method_count];
6530 CGObjCNonFragileABIMac::emitMethodList(Twine name, MethodListType kind,
6531 ArrayRef<const ObjCMethodDecl *> methods) {
6532 // Return null for empty list.
6533 if (methods.empty())
6534 return llvm::Constant::getNullValue(ObjCTypes.MethodListnfABIPtrTy);
6539 case MethodListType::CategoryInstanceMethods:
6540 prefix = "\01l_OBJC_$_CATEGORY_INSTANCE_METHODS_";
6541 forProtocol = false;
6543 case MethodListType::CategoryClassMethods:
6544 prefix = "\01l_OBJC_$_CATEGORY_CLASS_METHODS_";
6545 forProtocol = false;
6547 case MethodListType::InstanceMethods:
6548 prefix = "\01l_OBJC_$_INSTANCE_METHODS_";
6549 forProtocol = false;
6551 case MethodListType::ClassMethods:
6552 prefix = "\01l_OBJC_$_CLASS_METHODS_";
6553 forProtocol = false;
6556 case MethodListType::ProtocolInstanceMethods:
6557 prefix = "\01l_OBJC_$_PROTOCOL_INSTANCE_METHODS_";
6560 case MethodListType::ProtocolClassMethods:
6561 prefix = "\01l_OBJC_$_PROTOCOL_CLASS_METHODS_";
6564 case MethodListType::OptionalProtocolInstanceMethods:
6565 prefix = "\01l_OBJC_$_PROTOCOL_INSTANCE_METHODS_OPT_";
6568 case MethodListType::OptionalProtocolClassMethods:
6569 prefix = "\01l_OBJC_$_PROTOCOL_CLASS_METHODS_OPT_";
6574 ConstantInitBuilder builder(CGM);
6575 auto values = builder.beginStruct();
6577 // sizeof(struct _objc_method)
6578 unsigned Size = CGM.getDataLayout().getTypeAllocSize(ObjCTypes.MethodTy);
6579 values.addInt(ObjCTypes.IntTy, Size);
6581 values.addInt(ObjCTypes.IntTy, methods.size());
6582 auto methodArray = values.beginArray(ObjCTypes.MethodTy);
6583 for (auto MD : methods) {
6584 emitMethodConstant(methodArray, MD, forProtocol);
6586 methodArray.finishAndAddTo(values);
6588 auto *GV = values.finishAndCreateGlobal(prefix + name, CGM.getPointerAlign(),
6590 llvm::GlobalValue::PrivateLinkage);
6591 if (CGM.getTriple().isOSBinFormatMachO())
6592 GV->setSection("__DATA, __objc_const");
6593 CGM.addCompilerUsedGlobal(GV);
6594 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.MethodListnfABIPtrTy);
6597 /// ObjCIvarOffsetVariable - Returns the ivar offset variable for
6599 llvm::GlobalVariable *
6600 CGObjCNonFragileABIMac::ObjCIvarOffsetVariable(const ObjCInterfaceDecl *ID,
6601 const ObjCIvarDecl *Ivar) {
6602 const ObjCInterfaceDecl *Container = Ivar->getContainingInterface();
6603 llvm::SmallString<64> Name("OBJC_IVAR_$_");
6604 Name += Container->getObjCRuntimeNameAsString();
6606 Name += Ivar->getName();
6607 llvm::GlobalVariable *IvarOffsetGV = CGM.getModule().getGlobalVariable(Name);
6608 if (!IvarOffsetGV) {
6610 new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.IvarOffsetVarTy,
6611 false, llvm::GlobalValue::ExternalLinkage,
6612 nullptr, Name.str());
6613 if (CGM.getTriple().isOSBinFormatCOFF()) {
6614 bool IsPrivateOrPackage =
6615 Ivar->getAccessControl() == ObjCIvarDecl::Private ||
6616 Ivar->getAccessControl() == ObjCIvarDecl::Package;
6618 if (ID->hasAttr<DLLExportAttr>() && !IsPrivateOrPackage)
6619 IvarOffsetGV->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
6620 else if (ID->hasAttr<DLLImportAttr>())
6621 IvarOffsetGV->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
6624 return IvarOffsetGV;
6628 CGObjCNonFragileABIMac::EmitIvarOffsetVar(const ObjCInterfaceDecl *ID,
6629 const ObjCIvarDecl *Ivar,
6630 unsigned long int Offset) {
6631 llvm::GlobalVariable *IvarOffsetGV = ObjCIvarOffsetVariable(ID, Ivar);
6632 IvarOffsetGV->setInitializer(
6633 llvm::ConstantInt::get(ObjCTypes.IvarOffsetVarTy, Offset));
6634 IvarOffsetGV->setAlignment(
6635 CGM.getDataLayout().getABITypeAlignment(ObjCTypes.IvarOffsetVarTy));
6637 if (!CGM.getTriple().isOSBinFormatCOFF()) {
6638 // FIXME: This matches gcc, but shouldn't the visibility be set on the use
6639 // as well (i.e., in ObjCIvarOffsetVariable).
6640 if (Ivar->getAccessControl() == ObjCIvarDecl::Private ||
6641 Ivar->getAccessControl() == ObjCIvarDecl::Package ||
6642 ID->getVisibility() == HiddenVisibility)
6643 IvarOffsetGV->setVisibility(llvm::GlobalValue::HiddenVisibility);
6645 IvarOffsetGV->setVisibility(llvm::GlobalValue::DefaultVisibility);
6648 if (CGM.getTriple().isOSBinFormatMachO())
6649 IvarOffsetGV->setSection("__DATA, __objc_ivar");
6650 return IvarOffsetGV;
6653 /// EmitIvarList - Emit the ivar list for the given
6654 /// implementation. The return value has type
6655 /// IvarListnfABIPtrTy.
6656 /// struct _ivar_t {
6657 /// unsigned [long] int *offset; // pointer to ivar offset location
6660 /// uint32_t alignment;
6663 /// struct _ivar_list_t {
6664 /// uint32 entsize; // sizeof(struct _ivar_t)
6666 /// struct _iver_t list[count];
6670 llvm::Constant *CGObjCNonFragileABIMac::EmitIvarList(
6671 const ObjCImplementationDecl *ID) {
6673 ConstantInitBuilder builder(CGM);
6674 auto ivarList = builder.beginStruct();
6675 ivarList.addInt(ObjCTypes.IntTy,
6676 CGM.getDataLayout().getTypeAllocSize(ObjCTypes.IvarnfABITy));
6677 auto ivarCountSlot = ivarList.addPlaceholder();
6678 auto ivars = ivarList.beginArray(ObjCTypes.IvarnfABITy);
6680 const ObjCInterfaceDecl *OID = ID->getClassInterface();
6681 assert(OID && "CGObjCNonFragileABIMac::EmitIvarList - null interface");
6683 // FIXME. Consolidate this with similar code in GenerateClass.
6685 for (const ObjCIvarDecl *IVD = OID->all_declared_ivar_begin();
6686 IVD; IVD = IVD->getNextIvar()) {
6687 // Ignore unnamed bit-fields.
6688 if (!IVD->getDeclName())
6691 auto ivar = ivars.beginStruct(ObjCTypes.IvarnfABITy);
6692 ivar.add(EmitIvarOffsetVar(ID->getClassInterface(), IVD,
6693 ComputeIvarBaseOffset(CGM, ID, IVD)));
6694 ivar.add(GetMethodVarName(IVD->getIdentifier()));
6695 ivar.add(GetMethodVarType(IVD));
6696 llvm::Type *FieldTy =
6697 CGM.getTypes().ConvertTypeForMem(IVD->getType());
6698 unsigned Size = CGM.getDataLayout().getTypeAllocSize(FieldTy);
6699 unsigned Align = CGM.getContext().getPreferredTypeAlign(
6700 IVD->getType().getTypePtr()) >> 3;
6701 Align = llvm::Log2_32(Align);
6702 ivar.addInt(ObjCTypes.IntTy, Align);
6703 // NOTE. Size of a bitfield does not match gcc's, because of the
6704 // way bitfields are treated special in each. But I am told that
6705 // 'size' for bitfield ivars is ignored by the runtime so it does
6706 // not matter. If it matters, there is enough info to get the
6708 ivar.addInt(ObjCTypes.IntTy, Size);
6709 ivar.finishAndAddTo(ivars);
6711 // Return null for empty list.
6712 if (ivars.empty()) {
6715 return llvm::Constant::getNullValue(ObjCTypes.IvarListnfABIPtrTy);
6718 auto ivarCount = ivars.size();
6719 ivars.finishAndAddTo(ivarList);
6720 ivarList.fillPlaceholderWithInt(ivarCountSlot, ObjCTypes.IntTy, ivarCount);
6722 const char *Prefix = "\01l_OBJC_$_INSTANCE_VARIABLES_";
6723 llvm::GlobalVariable *GV =
6724 ivarList.finishAndCreateGlobal(Prefix + OID->getObjCRuntimeNameAsString(),
6725 CGM.getPointerAlign(), /*constant*/ false,
6726 llvm::GlobalValue::PrivateLinkage);
6727 if (CGM.getTriple().isOSBinFormatMachO())
6728 GV->setSection("__DATA, __objc_const");
6729 CGM.addCompilerUsedGlobal(GV);
6730 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.IvarListnfABIPtrTy);
6733 llvm::Constant *CGObjCNonFragileABIMac::GetOrEmitProtocolRef(
6734 const ObjCProtocolDecl *PD) {
6735 llvm::GlobalVariable *&Entry = Protocols[PD->getIdentifier()];
6738 // We use the initializer as a marker of whether this is a forward
6739 // reference or not. At module finalization we add the empty
6740 // contents for protocols which were referenced but never defined.
6741 llvm::SmallString<64> Protocol;
6742 llvm::raw_svector_ostream(Protocol) << "\01l_OBJC_PROTOCOL_$_"
6743 << PD->getObjCRuntimeNameAsString();
6745 Entry = new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.ProtocolnfABITy,
6746 false, llvm::GlobalValue::ExternalLinkage,
6748 if (!CGM.getTriple().isOSBinFormatMachO())
6749 Entry->setComdat(CGM.getModule().getOrInsertComdat(Protocol));
6755 /// GetOrEmitProtocol - Generate the protocol meta-data:
6757 /// struct _protocol_t {
6759 /// const char * const protocol_name;
6760 /// const struct _protocol_list_t * protocol_list; // super protocols
6761 /// const struct method_list_t * const instance_methods;
6762 /// const struct method_list_t * const class_methods;
6763 /// const struct method_list_t *optionalInstanceMethods;
6764 /// const struct method_list_t *optionalClassMethods;
6765 /// const struct _prop_list_t * properties;
6766 /// const uint32_t size; // sizeof(struct _protocol_t)
6767 /// const uint32_t flags; // = 0
6768 /// const char ** extendedMethodTypes;
6769 /// const char *demangledName;
6770 /// const struct _prop_list_t * class_properties;
6775 llvm::Constant *CGObjCNonFragileABIMac::GetOrEmitProtocol(
6776 const ObjCProtocolDecl *PD) {
6777 llvm::GlobalVariable *Entry = Protocols[PD->getIdentifier()];
6779 // Early exit if a defining object has already been generated.
6780 if (Entry && Entry->hasInitializer())
6783 // Use the protocol definition, if there is one.
6784 if (const ObjCProtocolDecl *Def = PD->getDefinition())
6787 auto methodLists = ProtocolMethodLists::get(PD);
6789 ConstantInitBuilder builder(CGM);
6790 auto values = builder.beginStruct(ObjCTypes.ProtocolnfABITy);
6793 values.addNullPointer(ObjCTypes.ObjectPtrTy);
6794 values.add(GetClassName(PD->getObjCRuntimeNameAsString()));
6795 values.add(EmitProtocolList("\01l_OBJC_$_PROTOCOL_REFS_"
6796 + PD->getObjCRuntimeNameAsString(),
6797 PD->protocol_begin(),
6798 PD->protocol_end()));
6799 values.add(methodLists.emitMethodList(this, PD,
6800 ProtocolMethodLists::RequiredInstanceMethods));
6801 values.add(methodLists.emitMethodList(this, PD,
6802 ProtocolMethodLists::RequiredClassMethods));
6803 values.add(methodLists.emitMethodList(this, PD,
6804 ProtocolMethodLists::OptionalInstanceMethods));
6805 values.add(methodLists.emitMethodList(this, PD,
6806 ProtocolMethodLists::OptionalClassMethods));
6807 values.add(EmitPropertyList(
6808 "\01l_OBJC_$_PROP_LIST_" + PD->getObjCRuntimeNameAsString(),
6809 nullptr, PD, ObjCTypes, false));
6811 CGM.getDataLayout().getTypeAllocSize(ObjCTypes.ProtocolnfABITy);
6812 values.addInt(ObjCTypes.IntTy, Size);
6813 values.addInt(ObjCTypes.IntTy, 0);
6814 values.add(EmitProtocolMethodTypes("\01l_OBJC_$_PROTOCOL_METHOD_TYPES_"
6815 + PD->getObjCRuntimeNameAsString(),
6816 methodLists.emitExtendedTypesArray(this),
6819 // const char *demangledName;
6820 values.addNullPointer(ObjCTypes.Int8PtrTy);
6822 values.add(EmitPropertyList(
6823 "\01l_OBJC_$_CLASS_PROP_LIST_" + PD->getObjCRuntimeNameAsString(),
6824 nullptr, PD, ObjCTypes, true));
6827 // Already created, fix the linkage and update the initializer.
6828 Entry->setLinkage(llvm::GlobalValue::WeakAnyLinkage);
6829 values.finishAndSetAsInitializer(Entry);
6831 llvm::SmallString<64> symbolName;
6832 llvm::raw_svector_ostream(symbolName)
6833 << "\01l_OBJC_PROTOCOL_$_" << PD->getObjCRuntimeNameAsString();
6835 Entry = values.finishAndCreateGlobal(symbolName, CGM.getPointerAlign(),
6837 llvm::GlobalValue::WeakAnyLinkage);
6838 if (!CGM.getTriple().isOSBinFormatMachO())
6839 Entry->setComdat(CGM.getModule().getOrInsertComdat(symbolName));
6841 Protocols[PD->getIdentifier()] = Entry;
6843 Entry->setVisibility(llvm::GlobalValue::HiddenVisibility);
6844 CGM.addCompilerUsedGlobal(Entry);
6846 // Use this protocol meta-data to build protocol list table in section
6847 // __DATA, __objc_protolist
6848 llvm::SmallString<64> ProtocolRef;
6849 llvm::raw_svector_ostream(ProtocolRef) << "\01l_OBJC_LABEL_PROTOCOL_$_"
6850 << PD->getObjCRuntimeNameAsString();
6852 llvm::GlobalVariable *PTGV =
6853 new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.ProtocolnfABIPtrTy,
6854 false, llvm::GlobalValue::WeakAnyLinkage, Entry,
6856 if (!CGM.getTriple().isOSBinFormatMachO())
6857 PTGV->setComdat(CGM.getModule().getOrInsertComdat(ProtocolRef));
6859 CGM.getDataLayout().getABITypeAlignment(ObjCTypes.ProtocolnfABIPtrTy));
6860 PTGV->setSection(GetSectionName("__objc_protolist",
6861 "coalesced,no_dead_strip"));
6862 PTGV->setVisibility(llvm::GlobalValue::HiddenVisibility);
6863 CGM.addCompilerUsedGlobal(PTGV);
6867 /// EmitProtocolList - Generate protocol list meta-data:
6869 /// struct _protocol_list_t {
6870 /// long protocol_count; // Note, this is 32/64 bit
6871 /// struct _protocol_t[protocol_count];
6876 CGObjCNonFragileABIMac::EmitProtocolList(Twine Name,
6877 ObjCProtocolDecl::protocol_iterator begin,
6878 ObjCProtocolDecl::protocol_iterator end) {
6879 SmallVector<llvm::Constant *, 16> ProtocolRefs;
6881 // Just return null for empty protocol lists
6883 return llvm::Constant::getNullValue(ObjCTypes.ProtocolListnfABIPtrTy);
6885 // FIXME: We shouldn't need to do this lookup here, should we?
6886 SmallString<256> TmpName;
6887 Name.toVector(TmpName);
6888 llvm::GlobalVariable *GV =
6889 CGM.getModule().getGlobalVariable(TmpName.str(), true);
6891 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.ProtocolListnfABIPtrTy);
6893 ConstantInitBuilder builder(CGM);
6894 auto values = builder.beginStruct();
6895 auto countSlot = values.addPlaceholder();
6897 // A null-terminated array of protocols.
6898 auto array = values.beginArray(ObjCTypes.ProtocolnfABIPtrTy);
6899 for (; begin != end; ++begin)
6900 array.add(GetProtocolRef(*begin)); // Implemented???
6901 auto count = array.size();
6902 array.addNullPointer(ObjCTypes.ProtocolnfABIPtrTy);
6904 array.finishAndAddTo(values);
6905 values.fillPlaceholderWithInt(countSlot, ObjCTypes.LongTy, count);
6907 GV = values.finishAndCreateGlobal(Name, CGM.getPointerAlign(),
6909 llvm::GlobalValue::PrivateLinkage);
6910 if (CGM.getTriple().isOSBinFormatMachO())
6911 GV->setSection("__DATA, __objc_const");
6912 CGM.addCompilerUsedGlobal(GV);
6913 return llvm::ConstantExpr::getBitCast(GV,
6914 ObjCTypes.ProtocolListnfABIPtrTy);
6917 /// EmitObjCValueForIvar - Code Gen for nonfragile ivar reference.
6918 /// This code gen. amounts to generating code for:
6920 /// (type *)((char *)base + _OBJC_IVAR_$_.ivar;
6923 LValue CGObjCNonFragileABIMac::EmitObjCValueForIvar(
6924 CodeGen::CodeGenFunction &CGF,
6926 llvm::Value *BaseValue,
6927 const ObjCIvarDecl *Ivar,
6928 unsigned CVRQualifiers) {
6929 ObjCInterfaceDecl *ID = ObjectTy->getAs<ObjCObjectType>()->getInterface();
6930 llvm::Value *Offset = EmitIvarOffset(CGF, ID, Ivar);
6931 return EmitValueForIvarAtOffset(CGF, ID, BaseValue, Ivar, CVRQualifiers,
6935 llvm::Value *CGObjCNonFragileABIMac::EmitIvarOffset(
6936 CodeGen::CodeGenFunction &CGF,
6937 const ObjCInterfaceDecl *Interface,
6938 const ObjCIvarDecl *Ivar) {
6939 llvm::Value *IvarOffsetValue = ObjCIvarOffsetVariable(Interface, Ivar);
6940 IvarOffsetValue = CGF.Builder.CreateAlignedLoad(IvarOffsetValue,
6941 CGF.getSizeAlign(), "ivar");
6942 if (IsIvarOffsetKnownIdempotent(CGF, Ivar))
6943 cast<llvm::LoadInst>(IvarOffsetValue)
6944 ->setMetadata(CGM.getModule().getMDKindID("invariant.load"),
6945 llvm::MDNode::get(VMContext, None));
6947 // This could be 32bit int or 64bit integer depending on the architecture.
6948 // Cast it to 64bit integer value, if it is a 32bit integer ivar offset value
6949 // as this is what caller always expectes.
6950 if (ObjCTypes.IvarOffsetVarTy == ObjCTypes.IntTy)
6951 IvarOffsetValue = CGF.Builder.CreateIntCast(
6952 IvarOffsetValue, ObjCTypes.LongTy, true, "ivar.conv");
6953 return IvarOffsetValue;
6956 static void appendSelectorForMessageRefTable(std::string &buffer,
6957 Selector selector) {
6958 if (selector.isUnarySelector()) {
6959 buffer += selector.getNameForSlot(0);
6963 for (unsigned i = 0, e = selector.getNumArgs(); i != e; ++i) {
6964 buffer += selector.getNameForSlot(i);
6969 /// Emit a "vtable" message send. We emit a weak hidden-visibility
6970 /// struct, initially containing the selector pointer and a pointer to
6971 /// a "fixup" variant of the appropriate objc_msgSend. To call, we
6972 /// load and call the function pointer, passing the address of the
6973 /// struct as the second parameter. The runtime determines whether
6974 /// the selector is currently emitted using vtable dispatch; if so, it
6975 /// substitutes a stub function which simply tail-calls through the
6976 /// appropriate vtable slot, and if not, it substitues a stub function
6977 /// which tail-calls objc_msgSend. Both stubs adjust the selector
6978 /// argument to correctly point to the selector.
6980 CGObjCNonFragileABIMac::EmitVTableMessageSend(CodeGenFunction &CGF,
6981 ReturnValueSlot returnSlot,
6982 QualType resultType,
6987 const CallArgList &formalArgs,
6988 const ObjCMethodDecl *method) {
6989 // Compute the actual arguments.
6992 // First argument: the receiver / super-call structure.
6994 arg0 = CGF.Builder.CreateBitCast(arg0, ObjCTypes.ObjectPtrTy);
6995 args.add(RValue::get(arg0), arg0Type);
6997 // Second argument: a pointer to the message ref structure. Leave
6998 // the actual argument value blank for now.
6999 args.add(RValue::get(nullptr), ObjCTypes.MessageRefCPtrTy);
7001 args.insert(args.end(), formalArgs.begin(), formalArgs.end());
7003 MessageSendInfo MSI = getMessageSendInfo(method, resultType, args);
7005 NullReturnState nullReturn;
7007 // Find the function to call and the mangled name for the message
7008 // ref structure. Using a different mangled name wouldn't actually
7009 // be a problem; it would just be a waste.
7011 // The runtime currently never uses vtable dispatch for anything
7012 // except normal, non-super message-sends.
7013 // FIXME: don't use this for that.
7014 llvm::Constant *fn = nullptr;
7015 std::string messageRefName("\01l_");
7016 if (CGM.ReturnSlotInterferesWithArgs(MSI.CallInfo)) {
7018 fn = ObjCTypes.getMessageSendSuper2StretFixupFn();
7019 messageRefName += "objc_msgSendSuper2_stret_fixup";
7021 nullReturn.init(CGF, arg0);
7022 fn = ObjCTypes.getMessageSendStretFixupFn();
7023 messageRefName += "objc_msgSend_stret_fixup";
7025 } else if (!isSuper && CGM.ReturnTypeUsesFPRet(resultType)) {
7026 fn = ObjCTypes.getMessageSendFpretFixupFn();
7027 messageRefName += "objc_msgSend_fpret_fixup";
7030 fn = ObjCTypes.getMessageSendSuper2FixupFn();
7031 messageRefName += "objc_msgSendSuper2_fixup";
7033 fn = ObjCTypes.getMessageSendFixupFn();
7034 messageRefName += "objc_msgSend_fixup";
7037 assert(fn && "CGObjCNonFragileABIMac::EmitMessageSend");
7038 messageRefName += '_';
7040 // Append the selector name, except use underscores anywhere we
7041 // would have used colons.
7042 appendSelectorForMessageRefTable(messageRefName, selector);
7044 llvm::GlobalVariable *messageRef
7045 = CGM.getModule().getGlobalVariable(messageRefName);
7047 // Build the message ref structure.
7048 ConstantInitBuilder builder(CGM);
7049 auto values = builder.beginStruct();
7051 values.add(GetMethodVarName(selector));
7052 messageRef = values.finishAndCreateGlobal(messageRefName,
7053 CharUnits::fromQuantity(16),
7055 llvm::GlobalValue::WeakAnyLinkage);
7056 messageRef->setVisibility(llvm::GlobalValue::HiddenVisibility);
7057 messageRef->setSection(GetSectionName("__objc_msgrefs", "coalesced"));
7060 bool requiresnullCheck = false;
7061 if (CGM.getLangOpts().ObjCAutoRefCount && method)
7062 for (const auto *ParamDecl : method->parameters()) {
7063 if (ParamDecl->hasAttr<NSConsumedAttr>()) {
7064 if (!nullReturn.NullBB)
7065 nullReturn.init(CGF, arg0);
7066 requiresnullCheck = true;
7072 Address(CGF.Builder.CreateBitCast(messageRef, ObjCTypes.MessageRefPtrTy),
7073 CGF.getPointerAlign());
7075 // Update the message ref argument.
7076 args[1].RV = RValue::get(mref.getPointer());
7078 // Load the function to call from the message ref table.
7079 Address calleeAddr =
7080 CGF.Builder.CreateStructGEP(mref, 0, CharUnits::Zero());
7081 llvm::Value *calleePtr = CGF.Builder.CreateLoad(calleeAddr, "msgSend_fn");
7083 calleePtr = CGF.Builder.CreateBitCast(calleePtr, MSI.MessengerType);
7084 CGCallee callee(CGCalleeInfo(), calleePtr);
7086 RValue result = CGF.EmitCall(MSI.CallInfo, callee, returnSlot, args);
7087 return nullReturn.complete(CGF, returnSlot, result, resultType, formalArgs,
7088 requiresnullCheck ? method : nullptr);
7091 /// Generate code for a message send expression in the nonfragile abi.
7093 CGObjCNonFragileABIMac::GenerateMessageSend(CodeGen::CodeGenFunction &CGF,
7094 ReturnValueSlot Return,
7095 QualType ResultType,
7097 llvm::Value *Receiver,
7098 const CallArgList &CallArgs,
7099 const ObjCInterfaceDecl *Class,
7100 const ObjCMethodDecl *Method) {
7101 return isVTableDispatchedSelector(Sel)
7102 ? EmitVTableMessageSend(CGF, Return, ResultType, Sel,
7103 Receiver, CGF.getContext().getObjCIdType(),
7104 false, CallArgs, Method)
7105 : EmitMessageSend(CGF, Return, ResultType,
7106 EmitSelector(CGF, Sel),
7107 Receiver, CGF.getContext().getObjCIdType(),
7108 false, CallArgs, Method, Class, ObjCTypes);
7112 CGObjCNonFragileABIMac::GetClassGlobal(const ObjCInterfaceDecl *ID,
7114 ForDefinition_t isForDefinition) {
7116 (metaclass ? getMetaclassSymbolPrefix() : getClassSymbolPrefix());
7117 return GetClassGlobal((prefix + ID->getObjCRuntimeNameAsString()).str(),
7119 ID->isWeakImported(),
7121 && CGM.getTriple().isOSBinFormatCOFF()
7122 && ID->hasAttr<DLLImportAttr>());
7126 CGObjCNonFragileABIMac::GetClassGlobal(StringRef Name,
7127 ForDefinition_t IsForDefinition,
7128 bool Weak, bool DLLImport) {
7129 llvm::GlobalValue::LinkageTypes L =
7130 Weak ? llvm::GlobalValue::ExternalWeakLinkage
7131 : llvm::GlobalValue::ExternalLinkage;
7135 llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name);
7137 GV = new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.ClassnfABITy,
7138 false, L, nullptr, Name);
7141 GV->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
7144 assert(GV->getLinkage() == L);
7149 CGObjCNonFragileABIMac::EmitClassRefFromId(CodeGenFunction &CGF,
7151 const ObjCInterfaceDecl *ID) {
7152 CharUnits Align = CGF.getPointerAlign();
7153 llvm::GlobalVariable *&Entry = ClassReferences[II];
7156 llvm::Constant *ClassGV;
7158 ClassGV = GetClassGlobal(ID, /*metaclass*/ false, NotForDefinition);
7160 ClassGV = GetClassGlobal((getClassSymbolPrefix() + II->getName()).str(),
7164 Entry = new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.ClassnfABIPtrTy,
7165 false, llvm::GlobalValue::PrivateLinkage,
7166 ClassGV, "OBJC_CLASSLIST_REFERENCES_$_");
7167 Entry->setAlignment(Align.getQuantity());
7168 Entry->setSection(GetSectionName("__objc_classrefs",
7169 "regular,no_dead_strip"));
7170 CGM.addCompilerUsedGlobal(Entry);
7172 return CGF.Builder.CreateAlignedLoad(Entry, Align);
7175 llvm::Value *CGObjCNonFragileABIMac::EmitClassRef(CodeGenFunction &CGF,
7176 const ObjCInterfaceDecl *ID) {
7177 // If the class has the objc_runtime_visible attribute, we need to
7178 // use the Objective-C runtime to get the class.
7179 if (ID->hasAttr<ObjCRuntimeVisibleAttr>())
7180 return EmitClassRefViaRuntime(CGF, ID, ObjCTypes);
7182 return EmitClassRefFromId(CGF, ID->getIdentifier(), ID);
7185 llvm::Value *CGObjCNonFragileABIMac::EmitNSAutoreleasePoolClassRef(
7186 CodeGenFunction &CGF) {
7187 IdentifierInfo *II = &CGM.getContext().Idents.get("NSAutoreleasePool");
7188 return EmitClassRefFromId(CGF, II, nullptr);
7192 CGObjCNonFragileABIMac::EmitSuperClassRef(CodeGenFunction &CGF,
7193 const ObjCInterfaceDecl *ID) {
7194 CharUnits Align = CGF.getPointerAlign();
7195 llvm::GlobalVariable *&Entry = SuperClassReferences[ID->getIdentifier()];
7198 auto ClassGV = GetClassGlobal(ID, /*metaclass*/ false, NotForDefinition);
7199 Entry = new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.ClassnfABIPtrTy,
7200 false, llvm::GlobalValue::PrivateLinkage,
7201 ClassGV, "OBJC_CLASSLIST_SUP_REFS_$_");
7202 Entry->setAlignment(Align.getQuantity());
7203 Entry->setSection(GetSectionName("__objc_superrefs",
7204 "regular,no_dead_strip"));
7205 CGM.addCompilerUsedGlobal(Entry);
7207 return CGF.Builder.CreateAlignedLoad(Entry, Align);
7210 /// EmitMetaClassRef - Return a Value * of the address of _class_t
7213 llvm::Value *CGObjCNonFragileABIMac::EmitMetaClassRef(CodeGenFunction &CGF,
7214 const ObjCInterfaceDecl *ID,
7216 CharUnits Align = CGF.getPointerAlign();
7217 llvm::GlobalVariable * &Entry = MetaClassReferences[ID->getIdentifier()];
7219 auto MetaClassGV = GetClassGlobal(ID, /*metaclass*/ true, NotForDefinition);
7221 Entry = new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.ClassnfABIPtrTy,
7222 false, llvm::GlobalValue::PrivateLinkage,
7223 MetaClassGV, "OBJC_CLASSLIST_SUP_REFS_$_");
7224 Entry->setAlignment(Align.getQuantity());
7226 Entry->setSection(GetSectionName("__objc_superrefs",
7227 "regular,no_dead_strip"));
7228 CGM.addCompilerUsedGlobal(Entry);
7231 return CGF.Builder.CreateAlignedLoad(Entry, Align);
7234 /// GetClass - Return a reference to the class for the given interface
7236 llvm::Value *CGObjCNonFragileABIMac::GetClass(CodeGenFunction &CGF,
7237 const ObjCInterfaceDecl *ID) {
7238 if (ID->isWeakImported()) {
7239 auto ClassGV = GetClassGlobal(ID, /*metaclass*/ false, NotForDefinition);
7241 assert(!isa<llvm::GlobalVariable>(ClassGV) ||
7242 cast<llvm::GlobalVariable>(ClassGV)->hasExternalWeakLinkage());
7245 return EmitClassRef(CGF, ID);
7248 /// Generates a message send where the super is the receiver. This is
7249 /// a message send to self with special delivery semantics indicating
7250 /// which class's method should be called.
7252 CGObjCNonFragileABIMac::GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF,
7253 ReturnValueSlot Return,
7254 QualType ResultType,
7256 const ObjCInterfaceDecl *Class,
7257 bool isCategoryImpl,
7258 llvm::Value *Receiver,
7259 bool IsClassMessage,
7260 const CodeGen::CallArgList &CallArgs,
7261 const ObjCMethodDecl *Method) {
7263 // Create and init a super structure; this is a (receiver, class)
7264 // pair we will pass to objc_msgSendSuper.
7266 CGF.CreateTempAlloca(ObjCTypes.SuperTy, CGF.getPointerAlign(),
7269 llvm::Value *ReceiverAsObject =
7270 CGF.Builder.CreateBitCast(Receiver, ObjCTypes.ObjectPtrTy);
7271 CGF.Builder.CreateStore(
7273 CGF.Builder.CreateStructGEP(ObjCSuper, 0, CharUnits::Zero()));
7275 // If this is a class message the metaclass is passed as the target.
7276 llvm::Value *Target;
7278 Target = EmitMetaClassRef(CGF, Class, Class->isWeakImported());
7280 Target = EmitSuperClassRef(CGF, Class);
7282 // FIXME: We shouldn't need to do this cast, rectify the ASTContext and
7284 llvm::Type *ClassTy =
7285 CGM.getTypes().ConvertType(CGF.getContext().getObjCClassType());
7286 Target = CGF.Builder.CreateBitCast(Target, ClassTy);
7287 CGF.Builder.CreateStore(
7288 Target, CGF.Builder.CreateStructGEP(ObjCSuper, 1, CGF.getPointerSize()));
7290 return (isVTableDispatchedSelector(Sel))
7291 ? EmitVTableMessageSend(CGF, Return, ResultType, Sel,
7292 ObjCSuper.getPointer(), ObjCTypes.SuperPtrCTy,
7293 true, CallArgs, Method)
7294 : EmitMessageSend(CGF, Return, ResultType,
7295 EmitSelector(CGF, Sel),
7296 ObjCSuper.getPointer(), ObjCTypes.SuperPtrCTy,
7297 true, CallArgs, Method, Class, ObjCTypes);
7300 llvm::Value *CGObjCNonFragileABIMac::EmitSelector(CodeGenFunction &CGF,
7302 Address Addr = EmitSelectorAddr(CGF, Sel);
7304 llvm::LoadInst* LI = CGF.Builder.CreateLoad(Addr);
7305 LI->setMetadata(CGM.getModule().getMDKindID("invariant.load"),
7306 llvm::MDNode::get(VMContext, None));
7310 Address CGObjCNonFragileABIMac::EmitSelectorAddr(CodeGenFunction &CGF,
7312 llvm::GlobalVariable *&Entry = SelectorReferences[Sel];
7314 CharUnits Align = CGF.getPointerAlign();
7316 llvm::Constant *Casted =
7317 llvm::ConstantExpr::getBitCast(GetMethodVarName(Sel),
7318 ObjCTypes.SelectorPtrTy);
7319 Entry = new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.SelectorPtrTy,
7320 false, llvm::GlobalValue::PrivateLinkage,
7321 Casted, "OBJC_SELECTOR_REFERENCES_");
7322 Entry->setExternallyInitialized(true);
7323 Entry->setSection(GetSectionName("__objc_selrefs",
7324 "literal_pointers,no_dead_strip"));
7325 Entry->setAlignment(Align.getQuantity());
7326 CGM.addCompilerUsedGlobal(Entry);
7329 return Address(Entry, Align);
7332 /// EmitObjCIvarAssign - Code gen for assigning to a __strong object.
7333 /// objc_assign_ivar (id src, id *dst, ptrdiff_t)
7335 void CGObjCNonFragileABIMac::EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF,
7338 llvm::Value *ivarOffset) {
7339 llvm::Type * SrcTy = src->getType();
7340 if (!isa<llvm::PointerType>(SrcTy)) {
7341 unsigned Size = CGM.getDataLayout().getTypeAllocSize(SrcTy);
7342 assert(Size <= 8 && "does not support size > 8");
7343 src = (Size == 4 ? CGF.Builder.CreateBitCast(src, ObjCTypes.IntTy)
7344 : CGF.Builder.CreateBitCast(src, ObjCTypes.LongTy));
7345 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy);
7347 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy);
7348 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy);
7349 llvm::Value *args[] = { src, dst.getPointer(), ivarOffset };
7350 CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignIvarFn(), args);
7353 /// EmitObjCStrongCastAssign - Code gen for assigning to a __strong cast object.
7354 /// objc_assign_strongCast (id src, id *dst)
7356 void CGObjCNonFragileABIMac::EmitObjCStrongCastAssign(
7357 CodeGen::CodeGenFunction &CGF,
7358 llvm::Value *src, Address dst) {
7359 llvm::Type * SrcTy = src->getType();
7360 if (!isa<llvm::PointerType>(SrcTy)) {
7361 unsigned Size = CGM.getDataLayout().getTypeAllocSize(SrcTy);
7362 assert(Size <= 8 && "does not support size > 8");
7363 src = (Size == 4 ? CGF.Builder.CreateBitCast(src, ObjCTypes.IntTy)
7364 : CGF.Builder.CreateBitCast(src, ObjCTypes.LongTy));
7365 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy);
7367 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy);
7368 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy);
7369 llvm::Value *args[] = { src, dst.getPointer() };
7370 CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignStrongCastFn(),
7371 args, "weakassign");
7374 void CGObjCNonFragileABIMac::EmitGCMemmoveCollectable(
7375 CodeGen::CodeGenFunction &CGF,
7378 llvm::Value *Size) {
7379 SrcPtr = CGF.Builder.CreateBitCast(SrcPtr, ObjCTypes.Int8PtrTy);
7380 DestPtr = CGF.Builder.CreateBitCast(DestPtr, ObjCTypes.Int8PtrTy);
7381 llvm::Value *args[] = { DestPtr.getPointer(), SrcPtr.getPointer(), Size };
7382 CGF.EmitNounwindRuntimeCall(ObjCTypes.GcMemmoveCollectableFn(), args);
7385 /// EmitObjCWeakRead - Code gen for loading value of a __weak
7386 /// object: objc_read_weak (id *src)
7388 llvm::Value * CGObjCNonFragileABIMac::EmitObjCWeakRead(
7389 CodeGen::CodeGenFunction &CGF,
7390 Address AddrWeakObj) {
7391 llvm::Type *DestTy = AddrWeakObj.getElementType();
7392 AddrWeakObj = CGF.Builder.CreateBitCast(AddrWeakObj, ObjCTypes.PtrObjectPtrTy);
7393 llvm::Value *read_weak =
7394 CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcReadWeakFn(),
7395 AddrWeakObj.getPointer(), "weakread");
7396 read_weak = CGF.Builder.CreateBitCast(read_weak, DestTy);
7400 /// EmitObjCWeakAssign - Code gen for assigning to a __weak object.
7401 /// objc_assign_weak (id src, id *dst)
7403 void CGObjCNonFragileABIMac::EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF,
7404 llvm::Value *src, Address dst) {
7405 llvm::Type * SrcTy = src->getType();
7406 if (!isa<llvm::PointerType>(SrcTy)) {
7407 unsigned Size = CGM.getDataLayout().getTypeAllocSize(SrcTy);
7408 assert(Size <= 8 && "does not support size > 8");
7409 src = (Size == 4 ? CGF.Builder.CreateBitCast(src, ObjCTypes.IntTy)
7410 : CGF.Builder.CreateBitCast(src, ObjCTypes.LongTy));
7411 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy);
7413 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy);
7414 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy);
7415 llvm::Value *args[] = { src, dst.getPointer() };
7416 CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignWeakFn(),
7417 args, "weakassign");
7420 /// EmitObjCGlobalAssign - Code gen for assigning to a __strong object.
7421 /// objc_assign_global (id src, id *dst)
7423 void CGObjCNonFragileABIMac::EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF,
7424 llvm::Value *src, Address dst,
7426 llvm::Type * SrcTy = src->getType();
7427 if (!isa<llvm::PointerType>(SrcTy)) {
7428 unsigned Size = CGM.getDataLayout().getTypeAllocSize(SrcTy);
7429 assert(Size <= 8 && "does not support size > 8");
7430 src = (Size == 4 ? CGF.Builder.CreateBitCast(src, ObjCTypes.IntTy)
7431 : CGF.Builder.CreateBitCast(src, ObjCTypes.LongTy));
7432 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy);
7434 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy);
7435 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy);
7436 llvm::Value *args[] = { src, dst.getPointer() };
7438 CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignGlobalFn(),
7439 args, "globalassign");
7441 CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignThreadLocalFn(),
7442 args, "threadlocalassign");
7446 CGObjCNonFragileABIMac::EmitSynchronizedStmt(CodeGen::CodeGenFunction &CGF,
7447 const ObjCAtSynchronizedStmt &S) {
7448 EmitAtSynchronizedStmt(CGF, S,
7449 cast<llvm::Function>(ObjCTypes.getSyncEnterFn()),
7450 cast<llvm::Function>(ObjCTypes.getSyncExitFn()));
7454 CGObjCNonFragileABIMac::GetEHType(QualType T) {
7455 // There's a particular fixed type info for 'id'.
7456 if (T->isObjCIdType() || T->isObjCQualifiedIdType()) {
7457 auto *IDEHType = CGM.getModule().getGlobalVariable("OBJC_EHTYPE_id");
7460 new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.EHTypeTy, false,
7461 llvm::GlobalValue::ExternalLinkage, nullptr,
7463 if (CGM.getTriple().isOSBinFormatCOFF())
7464 IDEHType->setDLLStorageClass(getStorage(CGM, "OBJC_EHTYPE_id"));
7469 // All other types should be Objective-C interface pointer types.
7470 const ObjCObjectPointerType *PT = T->getAs<ObjCObjectPointerType>();
7471 assert(PT && "Invalid @catch type.");
7473 const ObjCInterfaceType *IT = PT->getInterfaceType();
7474 assert(IT && "Invalid @catch type.");
7476 return GetInterfaceEHType(IT->getDecl(), NotForDefinition);
7479 void CGObjCNonFragileABIMac::EmitTryStmt(CodeGen::CodeGenFunction &CGF,
7480 const ObjCAtTryStmt &S) {
7481 EmitTryCatchStmt(CGF, S,
7482 cast<llvm::Function>(ObjCTypes.getObjCBeginCatchFn()),
7483 cast<llvm::Function>(ObjCTypes.getObjCEndCatchFn()),
7484 cast<llvm::Function>(ObjCTypes.getExceptionRethrowFn()));
7487 /// EmitThrowStmt - Generate code for a throw statement.
7488 void CGObjCNonFragileABIMac::EmitThrowStmt(CodeGen::CodeGenFunction &CGF,
7489 const ObjCAtThrowStmt &S,
7490 bool ClearInsertionPoint) {
7491 if (const Expr *ThrowExpr = S.getThrowExpr()) {
7492 llvm::Value *Exception = CGF.EmitObjCThrowOperand(ThrowExpr);
7493 Exception = CGF.Builder.CreateBitCast(Exception, ObjCTypes.ObjectPtrTy);
7494 CGF.EmitRuntimeCallOrInvoke(ObjCTypes.getExceptionThrowFn(), Exception)
7495 .setDoesNotReturn();
7497 CGF.EmitRuntimeCallOrInvoke(ObjCTypes.getExceptionRethrowFn())
7498 .setDoesNotReturn();
7501 CGF.Builder.CreateUnreachable();
7502 if (ClearInsertionPoint)
7503 CGF.Builder.ClearInsertionPoint();
7507 CGObjCNonFragileABIMac::GetInterfaceEHType(const ObjCInterfaceDecl *ID,
7508 ForDefinition_t IsForDefinition) {
7509 llvm::GlobalVariable * &Entry = EHTypeReferences[ID->getIdentifier()];
7510 StringRef ClassName = ID->getObjCRuntimeNameAsString();
7512 // If we don't need a definition, return the entry if found or check
7513 // if we use an external reference.
7514 if (!IsForDefinition) {
7518 // If this type (or a super class) has the __objc_exception__
7519 // attribute, emit an external reference.
7520 if (hasObjCExceptionAttribute(CGM.getContext(), ID)) {
7521 std::string EHTypeName = ("OBJC_EHTYPE_$_" + ClassName).str();
7522 Entry = new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.EHTypeTy,
7523 false, llvm::GlobalValue::ExternalLinkage,
7524 nullptr, EHTypeName);
7525 if (CGM.getTriple().isOSBinFormatCOFF()) {
7526 if (ID->hasAttr<DLLExportAttr>())
7527 Entry->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
7528 else if (ID->hasAttr<DLLImportAttr>())
7529 Entry->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
7535 // Otherwise we need to either make a new entry or fill in the initializer.
7536 assert((!Entry || !Entry->hasInitializer()) && "Duplicate EHType definition");
7538 std::string VTableName = "objc_ehtype_vtable";
7539 auto *VTableGV = CGM.getModule().getGlobalVariable(VTableName);
7542 new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.Int8PtrTy, false,
7543 llvm::GlobalValue::ExternalLinkage, nullptr,
7545 if (CGM.getTriple().isOSBinFormatCOFF())
7546 VTableGV->setDLLStorageClass(getStorage(CGM, VTableName));
7549 llvm::Value *VTableIdx = llvm::ConstantInt::get(CGM.Int32Ty, 2);
7550 ConstantInitBuilder builder(CGM);
7551 auto values = builder.beginStruct(ObjCTypes.EHTypeTy);
7552 values.add(llvm::ConstantExpr::getGetElementPtr(VTableGV->getValueType(),
7553 VTableGV, VTableIdx));
7554 values.add(GetClassName(ClassName));
7555 values.add(GetClassGlobal(ID, /*metaclass*/ false, NotForDefinition));
7557 llvm::GlobalValue::LinkageTypes L = IsForDefinition
7558 ? llvm::GlobalValue::ExternalLinkage
7559 : llvm::GlobalValue::WeakAnyLinkage;
7561 values.finishAndSetAsInitializer(Entry);
7562 Entry->setAlignment(CGM.getPointerAlign().getQuantity());
7564 Entry = values.finishAndCreateGlobal("OBJC_EHTYPE_$_" + ClassName,
7565 CGM.getPointerAlign(),
7568 if (CGM.getTriple().isOSBinFormatCOFF())
7569 if (hasObjCExceptionAttribute(CGM.getContext(), ID))
7570 if (ID->hasAttr<DLLExportAttr>())
7571 Entry->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
7573 assert(Entry->getLinkage() == L);
7575 if (!CGM.getTriple().isOSBinFormatCOFF())
7576 if (ID->getVisibility() == HiddenVisibility)
7577 Entry->setVisibility(llvm::GlobalValue::HiddenVisibility);
7579 if (IsForDefinition)
7580 if (CGM.getTriple().isOSBinFormatMachO())
7581 Entry->setSection("__DATA,__objc_const");
7588 CodeGen::CGObjCRuntime *
7589 CodeGen::CreateMacObjCRuntime(CodeGen::CodeGenModule &CGM) {
7590 switch (CGM.getLangOpts().ObjCRuntime.getKind()) {
7591 case ObjCRuntime::FragileMacOSX:
7592 return new CGObjCMac(CGM);
7594 case ObjCRuntime::MacOSX:
7595 case ObjCRuntime::iOS:
7596 case ObjCRuntime::WatchOS:
7597 return new CGObjCNonFragileABIMac(CGM);
7599 case ObjCRuntime::GNUstep:
7600 case ObjCRuntime::GCC:
7601 case ObjCRuntime::ObjFW:
7602 llvm_unreachable("these runtimes are not Mac runtimes");
7604 llvm_unreachable("bad runtime");