1 //===------- CGObjCMac.cpp - Interface to Apple Objective-C Runtime -------===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // This provides Objective-C code generation targeting the Apple runtime.
11 //===----------------------------------------------------------------------===//
14 #include "CGCleanup.h"
15 #include "CGObjCRuntime.h"
16 #include "CGRecordLayout.h"
17 #include "CodeGenFunction.h"
18 #include "CodeGenModule.h"
19 #include "clang/CodeGen/ConstantInitBuilder.h"
20 #include "clang/AST/ASTContext.h"
21 #include "clang/AST/Decl.h"
22 #include "clang/AST/DeclObjC.h"
23 #include "clang/AST/RecordLayout.h"
24 #include "clang/AST/StmtObjC.h"
25 #include "clang/Basic/CodeGenOptions.h"
26 #include "clang/Basic/LangOptions.h"
27 #include "clang/CodeGen/CGFunctionInfo.h"
28 #include "llvm/ADT/CachedHashString.h"
29 #include "llvm/ADT/DenseSet.h"
30 #include "llvm/ADT/SetVector.h"
31 #include "llvm/ADT/SmallPtrSet.h"
32 #include "llvm/ADT/SmallString.h"
33 #include "llvm/IR/DataLayout.h"
34 #include "llvm/IR/InlineAsm.h"
35 #include "llvm/IR/IntrinsicInst.h"
36 #include "llvm/IR/LLVMContext.h"
37 #include "llvm/IR/Module.h"
38 #include "llvm/Support/ScopedPrinter.h"
39 #include "llvm/Support/raw_ostream.h"
42 using namespace clang;
43 using namespace CodeGen;
47 // FIXME: We should find a nicer way to make the labels for metadata, string
48 // concatenation is lame.
50 class ObjCCommonTypesHelper {
52 llvm::LLVMContext &VMContext;
55 // The types of these functions don't really matter because we
56 // should always bitcast before calling them.
58 /// id objc_msgSend (id, SEL, ...)
60 /// The default messenger, used for sends whose ABI is unchanged from
61 /// the all-integer/pointer case.
62 llvm::FunctionCallee getMessageSendFn() const {
63 // Add the non-lazy-bind attribute, since objc_msgSend is likely to
65 llvm::Type *params[] = { ObjectPtrTy, SelectorPtrTy };
66 return CGM.CreateRuntimeFunction(
67 llvm::FunctionType::get(ObjectPtrTy, params, true), "objc_msgSend",
68 llvm::AttributeList::get(CGM.getLLVMContext(),
69 llvm::AttributeList::FunctionIndex,
70 llvm::Attribute::NonLazyBind));
73 /// void objc_msgSend_stret (id, SEL, ...)
75 /// The messenger used when the return value is an aggregate returned
76 /// by indirect reference in the first argument, and therefore the
77 /// self and selector parameters are shifted over by one.
78 llvm::FunctionCallee getMessageSendStretFn() const {
79 llvm::Type *params[] = { ObjectPtrTy, SelectorPtrTy };
80 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(CGM.VoidTy,
82 "objc_msgSend_stret");
85 /// [double | long double] objc_msgSend_fpret(id self, SEL op, ...)
87 /// The messenger used when the return value is returned on the x87
88 /// floating-point stack; without a special entrypoint, the nil case
89 /// would be unbalanced.
90 llvm::FunctionCallee getMessageSendFpretFn() const {
91 llvm::Type *params[] = { ObjectPtrTy, SelectorPtrTy };
92 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(CGM.DoubleTy,
94 "objc_msgSend_fpret");
97 /// _Complex long double objc_msgSend_fp2ret(id self, SEL op, ...)
99 /// The messenger used when the return value is returned in two values on the
100 /// x87 floating point stack; without a special entrypoint, the nil case
101 /// would be unbalanced. Only used on 64-bit X86.
102 llvm::FunctionCallee getMessageSendFp2retFn() const {
103 llvm::Type *params[] = { ObjectPtrTy, SelectorPtrTy };
104 llvm::Type *longDoubleType = llvm::Type::getX86_FP80Ty(VMContext);
105 llvm::Type *resultType =
106 llvm::StructType::get(longDoubleType, longDoubleType);
108 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(resultType,
110 "objc_msgSend_fp2ret");
113 /// id objc_msgSendSuper(struct objc_super *super, SEL op, ...)
115 /// The messenger used for super calls, which have different dispatch
116 /// semantics. The class passed is the superclass of the current
118 llvm::FunctionCallee getMessageSendSuperFn() const {
119 llvm::Type *params[] = { SuperPtrTy, SelectorPtrTy };
120 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy,
122 "objc_msgSendSuper");
125 /// id objc_msgSendSuper2(struct objc_super *super, SEL op, ...)
127 /// A slightly different messenger used for super calls. The class
128 /// passed is the current class.
129 llvm::FunctionCallee getMessageSendSuperFn2() const {
130 llvm::Type *params[] = { SuperPtrTy, SelectorPtrTy };
131 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy,
133 "objc_msgSendSuper2");
136 /// void objc_msgSendSuper_stret(void *stretAddr, struct objc_super *super,
139 /// The messenger used for super calls which return an aggregate indirectly.
140 llvm::FunctionCallee getMessageSendSuperStretFn() const {
141 llvm::Type *params[] = { Int8PtrTy, SuperPtrTy, SelectorPtrTy };
142 return CGM.CreateRuntimeFunction(
143 llvm::FunctionType::get(CGM.VoidTy, params, true),
144 "objc_msgSendSuper_stret");
147 /// void objc_msgSendSuper2_stret(void * stretAddr, struct objc_super *super,
150 /// objc_msgSendSuper_stret with the super2 semantics.
151 llvm::FunctionCallee getMessageSendSuperStretFn2() const {
152 llvm::Type *params[] = { Int8PtrTy, SuperPtrTy, SelectorPtrTy };
153 return CGM.CreateRuntimeFunction(
154 llvm::FunctionType::get(CGM.VoidTy, params, true),
155 "objc_msgSendSuper2_stret");
158 llvm::FunctionCallee getMessageSendSuperFpretFn() const {
159 // There is no objc_msgSendSuper_fpret? How can that work?
160 return getMessageSendSuperFn();
163 llvm::FunctionCallee getMessageSendSuperFpretFn2() const {
164 // There is no objc_msgSendSuper_fpret? How can that work?
165 return getMessageSendSuperFn2();
169 CodeGen::CodeGenModule &CGM;
172 llvm::IntegerType *ShortTy, *IntTy, *LongTy;
173 llvm::PointerType *Int8PtrTy, *Int8PtrPtrTy;
174 llvm::Type *IvarOffsetVarTy;
176 /// ObjectPtrTy - LLVM type for object handles (typeof(id))
177 llvm::PointerType *ObjectPtrTy;
179 /// PtrObjectPtrTy - LLVM type for id *
180 llvm::PointerType *PtrObjectPtrTy;
182 /// SelectorPtrTy - LLVM type for selector handles (typeof(SEL))
183 llvm::PointerType *SelectorPtrTy;
186 /// ProtocolPtrTy - LLVM type for external protocol handles
187 /// (typeof(Protocol))
188 llvm::Type *ExternalProtocolPtrTy;
191 llvm::Type *getExternalProtocolPtrTy() {
192 if (!ExternalProtocolPtrTy) {
193 // FIXME: It would be nice to unify this with the opaque type, so that the
194 // IR comes out a bit cleaner.
195 CodeGen::CodeGenTypes &Types = CGM.getTypes();
196 ASTContext &Ctx = CGM.getContext();
197 llvm::Type *T = Types.ConvertType(Ctx.getObjCProtoType());
198 ExternalProtocolPtrTy = llvm::PointerType::getUnqual(T);
201 return ExternalProtocolPtrTy;
204 // SuperCTy - clang type for struct objc_super.
206 // SuperPtrCTy - clang type for struct objc_super *.
207 QualType SuperPtrCTy;
209 /// SuperTy - LLVM type for struct objc_super.
210 llvm::StructType *SuperTy;
211 /// SuperPtrTy - LLVM type for struct objc_super *.
212 llvm::PointerType *SuperPtrTy;
214 /// PropertyTy - LLVM type for struct objc_property (struct _prop_t
215 /// in GCC parlance).
216 llvm::StructType *PropertyTy;
218 /// PropertyListTy - LLVM type for struct objc_property_list
219 /// (_prop_list_t in GCC parlance).
220 llvm::StructType *PropertyListTy;
221 /// PropertyListPtrTy - LLVM type for struct objc_property_list*.
222 llvm::PointerType *PropertyListPtrTy;
224 // MethodTy - LLVM type for struct objc_method.
225 llvm::StructType *MethodTy;
227 /// CacheTy - LLVM type for struct objc_cache.
229 /// CachePtrTy - LLVM type for struct objc_cache *.
230 llvm::PointerType *CachePtrTy;
232 llvm::FunctionCallee getGetPropertyFn() {
233 CodeGen::CodeGenTypes &Types = CGM.getTypes();
234 ASTContext &Ctx = CGM.getContext();
235 // id objc_getProperty (id, SEL, ptrdiff_t, bool)
236 CanQualType IdType = Ctx.getCanonicalParamType(Ctx.getObjCIdType());
237 CanQualType SelType = Ctx.getCanonicalParamType(Ctx.getObjCSelType());
238 CanQualType Params[] = {
240 Ctx.getPointerDiffType()->getCanonicalTypeUnqualified(), Ctx.BoolTy};
241 llvm::FunctionType *FTy =
242 Types.GetFunctionType(
243 Types.arrangeBuiltinFunctionDeclaration(IdType, Params));
244 return CGM.CreateRuntimeFunction(FTy, "objc_getProperty");
247 llvm::FunctionCallee getSetPropertyFn() {
248 CodeGen::CodeGenTypes &Types = CGM.getTypes();
249 ASTContext &Ctx = CGM.getContext();
250 // void objc_setProperty (id, SEL, ptrdiff_t, id, bool, bool)
251 CanQualType IdType = Ctx.getCanonicalParamType(Ctx.getObjCIdType());
252 CanQualType SelType = Ctx.getCanonicalParamType(Ctx.getObjCSelType());
253 CanQualType Params[] = {
256 Ctx.getPointerDiffType()->getCanonicalTypeUnqualified(),
260 llvm::FunctionType *FTy =
261 Types.GetFunctionType(
262 Types.arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, Params));
263 return CGM.CreateRuntimeFunction(FTy, "objc_setProperty");
266 llvm::FunctionCallee getOptimizedSetPropertyFn(bool atomic, bool copy) {
267 CodeGen::CodeGenTypes &Types = CGM.getTypes();
268 ASTContext &Ctx = CGM.getContext();
269 // void objc_setProperty_atomic(id self, SEL _cmd,
270 // id newValue, ptrdiff_t offset);
271 // void objc_setProperty_nonatomic(id self, SEL _cmd,
272 // id newValue, ptrdiff_t offset);
273 // void objc_setProperty_atomic_copy(id self, SEL _cmd,
274 // id newValue, ptrdiff_t offset);
275 // void objc_setProperty_nonatomic_copy(id self, SEL _cmd,
276 // id newValue, ptrdiff_t offset);
278 SmallVector<CanQualType,4> Params;
279 CanQualType IdType = Ctx.getCanonicalParamType(Ctx.getObjCIdType());
280 CanQualType SelType = Ctx.getCanonicalParamType(Ctx.getObjCSelType());
281 Params.push_back(IdType);
282 Params.push_back(SelType);
283 Params.push_back(IdType);
284 Params.push_back(Ctx.getPointerDiffType()->getCanonicalTypeUnqualified());
285 llvm::FunctionType *FTy =
286 Types.GetFunctionType(
287 Types.arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, Params));
290 name = "objc_setProperty_atomic_copy";
291 else if (atomic && !copy)
292 name = "objc_setProperty_atomic";
293 else if (!atomic && copy)
294 name = "objc_setProperty_nonatomic_copy";
296 name = "objc_setProperty_nonatomic";
298 return CGM.CreateRuntimeFunction(FTy, name);
301 llvm::FunctionCallee getCopyStructFn() {
302 CodeGen::CodeGenTypes &Types = CGM.getTypes();
303 ASTContext &Ctx = CGM.getContext();
304 // void objc_copyStruct (void *, const void *, size_t, bool, bool)
305 SmallVector<CanQualType,5> Params;
306 Params.push_back(Ctx.VoidPtrTy);
307 Params.push_back(Ctx.VoidPtrTy);
308 Params.push_back(Ctx.getSizeType());
309 Params.push_back(Ctx.BoolTy);
310 Params.push_back(Ctx.BoolTy);
311 llvm::FunctionType *FTy =
312 Types.GetFunctionType(
313 Types.arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, Params));
314 return CGM.CreateRuntimeFunction(FTy, "objc_copyStruct");
317 /// This routine declares and returns address of:
318 /// void objc_copyCppObjectAtomic(
319 /// void *dest, const void *src,
320 /// void (*copyHelper) (void *dest, const void *source));
321 llvm::FunctionCallee getCppAtomicObjectFunction() {
322 CodeGen::CodeGenTypes &Types = CGM.getTypes();
323 ASTContext &Ctx = CGM.getContext();
324 /// void objc_copyCppObjectAtomic(void *dest, const void *src, void *helper);
325 SmallVector<CanQualType,3> Params;
326 Params.push_back(Ctx.VoidPtrTy);
327 Params.push_back(Ctx.VoidPtrTy);
328 Params.push_back(Ctx.VoidPtrTy);
329 llvm::FunctionType *FTy =
330 Types.GetFunctionType(
331 Types.arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, Params));
332 return CGM.CreateRuntimeFunction(FTy, "objc_copyCppObjectAtomic");
335 llvm::FunctionCallee getEnumerationMutationFn() {
336 CodeGen::CodeGenTypes &Types = CGM.getTypes();
337 ASTContext &Ctx = CGM.getContext();
338 // void objc_enumerationMutation (id)
339 SmallVector<CanQualType,1> Params;
340 Params.push_back(Ctx.getCanonicalParamType(Ctx.getObjCIdType()));
341 llvm::FunctionType *FTy =
342 Types.GetFunctionType(
343 Types.arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, Params));
344 return CGM.CreateRuntimeFunction(FTy, "objc_enumerationMutation");
347 llvm::FunctionCallee getLookUpClassFn() {
348 CodeGen::CodeGenTypes &Types = CGM.getTypes();
349 ASTContext &Ctx = CGM.getContext();
350 // Class objc_lookUpClass (const char *)
351 SmallVector<CanQualType,1> Params;
353 Ctx.getCanonicalType(Ctx.getPointerType(Ctx.CharTy.withConst())));
354 llvm::FunctionType *FTy =
355 Types.GetFunctionType(Types.arrangeBuiltinFunctionDeclaration(
356 Ctx.getCanonicalType(Ctx.getObjCClassType()),
358 return CGM.CreateRuntimeFunction(FTy, "objc_lookUpClass");
361 /// GcReadWeakFn -- LLVM objc_read_weak (id *src) function.
362 llvm::FunctionCallee getGcReadWeakFn() {
363 // id objc_read_weak (id *)
364 llvm::Type *args[] = { ObjectPtrTy->getPointerTo() };
365 llvm::FunctionType *FTy =
366 llvm::FunctionType::get(ObjectPtrTy, args, false);
367 return CGM.CreateRuntimeFunction(FTy, "objc_read_weak");
370 /// GcAssignWeakFn -- LLVM objc_assign_weak function.
371 llvm::FunctionCallee getGcAssignWeakFn() {
372 // id objc_assign_weak (id, id *)
373 llvm::Type *args[] = { ObjectPtrTy, ObjectPtrTy->getPointerTo() };
374 llvm::FunctionType *FTy =
375 llvm::FunctionType::get(ObjectPtrTy, args, false);
376 return CGM.CreateRuntimeFunction(FTy, "objc_assign_weak");
379 /// GcAssignGlobalFn -- LLVM objc_assign_global function.
380 llvm::FunctionCallee getGcAssignGlobalFn() {
381 // id objc_assign_global(id, id *)
382 llvm::Type *args[] = { ObjectPtrTy, ObjectPtrTy->getPointerTo() };
383 llvm::FunctionType *FTy =
384 llvm::FunctionType::get(ObjectPtrTy, args, false);
385 return CGM.CreateRuntimeFunction(FTy, "objc_assign_global");
388 /// GcAssignThreadLocalFn -- LLVM objc_assign_threadlocal function.
389 llvm::FunctionCallee getGcAssignThreadLocalFn() {
390 // id objc_assign_threadlocal(id src, id * dest)
391 llvm::Type *args[] = { ObjectPtrTy, ObjectPtrTy->getPointerTo() };
392 llvm::FunctionType *FTy =
393 llvm::FunctionType::get(ObjectPtrTy, args, false);
394 return CGM.CreateRuntimeFunction(FTy, "objc_assign_threadlocal");
397 /// GcAssignIvarFn -- LLVM objc_assign_ivar function.
398 llvm::FunctionCallee getGcAssignIvarFn() {
399 // id objc_assign_ivar(id, id *, ptrdiff_t)
400 llvm::Type *args[] = { ObjectPtrTy, ObjectPtrTy->getPointerTo(),
402 llvm::FunctionType *FTy =
403 llvm::FunctionType::get(ObjectPtrTy, args, false);
404 return CGM.CreateRuntimeFunction(FTy, "objc_assign_ivar");
407 /// GcMemmoveCollectableFn -- LLVM objc_memmove_collectable function.
408 llvm::FunctionCallee GcMemmoveCollectableFn() {
409 // void *objc_memmove_collectable(void *dst, const void *src, size_t size)
410 llvm::Type *args[] = { Int8PtrTy, Int8PtrTy, LongTy };
411 llvm::FunctionType *FTy = llvm::FunctionType::get(Int8PtrTy, args, false);
412 return CGM.CreateRuntimeFunction(FTy, "objc_memmove_collectable");
415 /// GcAssignStrongCastFn -- LLVM objc_assign_strongCast function.
416 llvm::FunctionCallee getGcAssignStrongCastFn() {
417 // id objc_assign_strongCast(id, id *)
418 llvm::Type *args[] = { ObjectPtrTy, ObjectPtrTy->getPointerTo() };
419 llvm::FunctionType *FTy =
420 llvm::FunctionType::get(ObjectPtrTy, args, false);
421 return CGM.CreateRuntimeFunction(FTy, "objc_assign_strongCast");
424 /// ExceptionThrowFn - LLVM objc_exception_throw function.
425 llvm::FunctionCallee getExceptionThrowFn() {
426 // void objc_exception_throw(id)
427 llvm::Type *args[] = { ObjectPtrTy };
428 llvm::FunctionType *FTy =
429 llvm::FunctionType::get(CGM.VoidTy, args, false);
430 return CGM.CreateRuntimeFunction(FTy, "objc_exception_throw");
433 /// ExceptionRethrowFn - LLVM objc_exception_rethrow function.
434 llvm::FunctionCallee getExceptionRethrowFn() {
435 // void objc_exception_rethrow(void)
436 llvm::FunctionType *FTy = llvm::FunctionType::get(CGM.VoidTy, false);
437 return CGM.CreateRuntimeFunction(FTy, "objc_exception_rethrow");
440 /// SyncEnterFn - LLVM object_sync_enter function.
441 llvm::FunctionCallee getSyncEnterFn() {
442 // int objc_sync_enter (id)
443 llvm::Type *args[] = { ObjectPtrTy };
444 llvm::FunctionType *FTy =
445 llvm::FunctionType::get(CGM.IntTy, args, false);
446 return CGM.CreateRuntimeFunction(FTy, "objc_sync_enter");
449 /// SyncExitFn - LLVM object_sync_exit function.
450 llvm::FunctionCallee getSyncExitFn() {
451 // int objc_sync_exit (id)
452 llvm::Type *args[] = { ObjectPtrTy };
453 llvm::FunctionType *FTy =
454 llvm::FunctionType::get(CGM.IntTy, args, false);
455 return CGM.CreateRuntimeFunction(FTy, "objc_sync_exit");
458 llvm::FunctionCallee getSendFn(bool IsSuper) const {
459 return IsSuper ? getMessageSendSuperFn() : getMessageSendFn();
462 llvm::FunctionCallee getSendFn2(bool IsSuper) const {
463 return IsSuper ? getMessageSendSuperFn2() : getMessageSendFn();
466 llvm::FunctionCallee getSendStretFn(bool IsSuper) const {
467 return IsSuper ? getMessageSendSuperStretFn() : getMessageSendStretFn();
470 llvm::FunctionCallee getSendStretFn2(bool IsSuper) const {
471 return IsSuper ? getMessageSendSuperStretFn2() : getMessageSendStretFn();
474 llvm::FunctionCallee getSendFpretFn(bool IsSuper) const {
475 return IsSuper ? getMessageSendSuperFpretFn() : getMessageSendFpretFn();
478 llvm::FunctionCallee getSendFpretFn2(bool IsSuper) const {
479 return IsSuper ? getMessageSendSuperFpretFn2() : getMessageSendFpretFn();
482 llvm::FunctionCallee getSendFp2retFn(bool IsSuper) const {
483 return IsSuper ? getMessageSendSuperFn() : getMessageSendFp2retFn();
486 llvm::FunctionCallee getSendFp2RetFn2(bool IsSuper) const {
487 return IsSuper ? getMessageSendSuperFn2() : getMessageSendFp2retFn();
490 ObjCCommonTypesHelper(CodeGen::CodeGenModule &cgm);
493 /// ObjCTypesHelper - Helper class that encapsulates lazy
494 /// construction of varies types used during ObjC generation.
495 class ObjCTypesHelper : public ObjCCommonTypesHelper {
497 /// SymtabTy - LLVM type for struct objc_symtab.
498 llvm::StructType *SymtabTy;
499 /// SymtabPtrTy - LLVM type for struct objc_symtab *.
500 llvm::PointerType *SymtabPtrTy;
501 /// ModuleTy - LLVM type for struct objc_module.
502 llvm::StructType *ModuleTy;
504 /// ProtocolTy - LLVM type for struct objc_protocol.
505 llvm::StructType *ProtocolTy;
506 /// ProtocolPtrTy - LLVM type for struct objc_protocol *.
507 llvm::PointerType *ProtocolPtrTy;
508 /// ProtocolExtensionTy - LLVM type for struct
509 /// objc_protocol_extension.
510 llvm::StructType *ProtocolExtensionTy;
511 /// ProtocolExtensionTy - LLVM type for struct
512 /// objc_protocol_extension *.
513 llvm::PointerType *ProtocolExtensionPtrTy;
514 /// MethodDescriptionTy - LLVM type for struct
515 /// objc_method_description.
516 llvm::StructType *MethodDescriptionTy;
517 /// MethodDescriptionListTy - LLVM type for struct
518 /// objc_method_description_list.
519 llvm::StructType *MethodDescriptionListTy;
520 /// MethodDescriptionListPtrTy - LLVM type for struct
521 /// objc_method_description_list *.
522 llvm::PointerType *MethodDescriptionListPtrTy;
523 /// ProtocolListTy - LLVM type for struct objc_property_list.
524 llvm::StructType *ProtocolListTy;
525 /// ProtocolListPtrTy - LLVM type for struct objc_property_list*.
526 llvm::PointerType *ProtocolListPtrTy;
527 /// CategoryTy - LLVM type for struct objc_category.
528 llvm::StructType *CategoryTy;
529 /// ClassTy - LLVM type for struct objc_class.
530 llvm::StructType *ClassTy;
531 /// ClassPtrTy - LLVM type for struct objc_class *.
532 llvm::PointerType *ClassPtrTy;
533 /// ClassExtensionTy - LLVM type for struct objc_class_ext.
534 llvm::StructType *ClassExtensionTy;
535 /// ClassExtensionPtrTy - LLVM type for struct objc_class_ext *.
536 llvm::PointerType *ClassExtensionPtrTy;
537 // IvarTy - LLVM type for struct objc_ivar.
538 llvm::StructType *IvarTy;
539 /// IvarListTy - LLVM type for struct objc_ivar_list.
540 llvm::StructType *IvarListTy;
541 /// IvarListPtrTy - LLVM type for struct objc_ivar_list *.
542 llvm::PointerType *IvarListPtrTy;
543 /// MethodListTy - LLVM type for struct objc_method_list.
544 llvm::StructType *MethodListTy;
545 /// MethodListPtrTy - LLVM type for struct objc_method_list *.
546 llvm::PointerType *MethodListPtrTy;
548 /// ExceptionDataTy - LLVM type for struct _objc_exception_data.
549 llvm::StructType *ExceptionDataTy;
551 /// ExceptionTryEnterFn - LLVM objc_exception_try_enter function.
552 llvm::FunctionCallee getExceptionTryEnterFn() {
553 llvm::Type *params[] = { ExceptionDataTy->getPointerTo() };
554 return CGM.CreateRuntimeFunction(
555 llvm::FunctionType::get(CGM.VoidTy, params, false),
556 "objc_exception_try_enter");
559 /// ExceptionTryExitFn - LLVM objc_exception_try_exit function.
560 llvm::FunctionCallee getExceptionTryExitFn() {
561 llvm::Type *params[] = { ExceptionDataTy->getPointerTo() };
562 return CGM.CreateRuntimeFunction(
563 llvm::FunctionType::get(CGM.VoidTy, params, false),
564 "objc_exception_try_exit");
567 /// ExceptionExtractFn - LLVM objc_exception_extract function.
568 llvm::FunctionCallee getExceptionExtractFn() {
569 llvm::Type *params[] = { ExceptionDataTy->getPointerTo() };
570 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy,
572 "objc_exception_extract");
575 /// ExceptionMatchFn - LLVM objc_exception_match function.
576 llvm::FunctionCallee getExceptionMatchFn() {
577 llvm::Type *params[] = { ClassPtrTy, ObjectPtrTy };
578 return CGM.CreateRuntimeFunction(
579 llvm::FunctionType::get(CGM.Int32Ty, params, false),
580 "objc_exception_match");
583 /// SetJmpFn - LLVM _setjmp function.
584 llvm::FunctionCallee getSetJmpFn() {
585 // This is specifically the prototype for x86.
586 llvm::Type *params[] = { CGM.Int32Ty->getPointerTo() };
587 return CGM.CreateRuntimeFunction(
588 llvm::FunctionType::get(CGM.Int32Ty, params, false), "_setjmp",
589 llvm::AttributeList::get(CGM.getLLVMContext(),
590 llvm::AttributeList::FunctionIndex,
591 llvm::Attribute::NonLazyBind));
595 ObjCTypesHelper(CodeGen::CodeGenModule &cgm);
598 /// ObjCNonFragileABITypesHelper - will have all types needed by objective-c's
600 class ObjCNonFragileABITypesHelper : public ObjCCommonTypesHelper {
602 // MethodListnfABITy - LLVM for struct _method_list_t
603 llvm::StructType *MethodListnfABITy;
605 // MethodListnfABIPtrTy - LLVM for struct _method_list_t*
606 llvm::PointerType *MethodListnfABIPtrTy;
608 // ProtocolnfABITy = LLVM for struct _protocol_t
609 llvm::StructType *ProtocolnfABITy;
611 // ProtocolnfABIPtrTy = LLVM for struct _protocol_t*
612 llvm::PointerType *ProtocolnfABIPtrTy;
614 // ProtocolListnfABITy - LLVM for struct _objc_protocol_list
615 llvm::StructType *ProtocolListnfABITy;
617 // ProtocolListnfABIPtrTy - LLVM for struct _objc_protocol_list*
618 llvm::PointerType *ProtocolListnfABIPtrTy;
620 // ClassnfABITy - LLVM for struct _class_t
621 llvm::StructType *ClassnfABITy;
623 // ClassnfABIPtrTy - LLVM for struct _class_t*
624 llvm::PointerType *ClassnfABIPtrTy;
626 // IvarnfABITy - LLVM for struct _ivar_t
627 llvm::StructType *IvarnfABITy;
629 // IvarListnfABITy - LLVM for struct _ivar_list_t
630 llvm::StructType *IvarListnfABITy;
632 // IvarListnfABIPtrTy = LLVM for struct _ivar_list_t*
633 llvm::PointerType *IvarListnfABIPtrTy;
635 // ClassRonfABITy - LLVM for struct _class_ro_t
636 llvm::StructType *ClassRonfABITy;
638 // ImpnfABITy - LLVM for id (*)(id, SEL, ...)
639 llvm::PointerType *ImpnfABITy;
641 // CategorynfABITy - LLVM for struct _category_t
642 llvm::StructType *CategorynfABITy;
644 // New types for nonfragile abi messaging.
646 // MessageRefTy - LLVM for:
647 // struct _message_ref_t {
651 llvm::StructType *MessageRefTy;
652 // MessageRefCTy - clang type for struct _message_ref_t
653 QualType MessageRefCTy;
655 // MessageRefPtrTy - LLVM for struct _message_ref_t*
656 llvm::Type *MessageRefPtrTy;
657 // MessageRefCPtrTy - clang type for struct _message_ref_t*
658 QualType MessageRefCPtrTy;
660 // SuperMessageRefTy - LLVM for:
661 // struct _super_message_ref_t {
662 // SUPER_IMP messenger;
665 llvm::StructType *SuperMessageRefTy;
667 // SuperMessageRefPtrTy - LLVM for struct _super_message_ref_t*
668 llvm::PointerType *SuperMessageRefPtrTy;
670 llvm::FunctionCallee getMessageSendFixupFn() {
671 // id objc_msgSend_fixup(id, struct message_ref_t*, ...)
672 llvm::Type *params[] = { ObjectPtrTy, MessageRefPtrTy };
673 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy,
675 "objc_msgSend_fixup");
678 llvm::FunctionCallee getMessageSendFpretFixupFn() {
679 // id objc_msgSend_fpret_fixup(id, struct message_ref_t*, ...)
680 llvm::Type *params[] = { ObjectPtrTy, MessageRefPtrTy };
681 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy,
683 "objc_msgSend_fpret_fixup");
686 llvm::FunctionCallee getMessageSendStretFixupFn() {
687 // id objc_msgSend_stret_fixup(id, struct message_ref_t*, ...)
688 llvm::Type *params[] = { ObjectPtrTy, MessageRefPtrTy };
689 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy,
691 "objc_msgSend_stret_fixup");
694 llvm::FunctionCallee getMessageSendSuper2FixupFn() {
695 // id objc_msgSendSuper2_fixup (struct objc_super *,
696 // struct _super_message_ref_t*, ...)
697 llvm::Type *params[] = { SuperPtrTy, SuperMessageRefPtrTy };
698 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy,
700 "objc_msgSendSuper2_fixup");
703 llvm::FunctionCallee getMessageSendSuper2StretFixupFn() {
704 // id objc_msgSendSuper2_stret_fixup(struct objc_super *,
705 // struct _super_message_ref_t*, ...)
706 llvm::Type *params[] = { SuperPtrTy, SuperMessageRefPtrTy };
707 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy,
709 "objc_msgSendSuper2_stret_fixup");
712 llvm::FunctionCallee getObjCEndCatchFn() {
713 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(CGM.VoidTy, false),
717 llvm::FunctionCallee getObjCBeginCatchFn() {
718 llvm::Type *params[] = { Int8PtrTy };
719 return CGM.CreateRuntimeFunction(llvm::FunctionType::get(Int8PtrTy,
724 /// Class objc_loadClassref (void *)
726 /// Loads from a classref. For Objective-C stub classes, this invokes the
727 /// initialization callback stored inside the stub. For all other classes
728 /// this simply dereferences the pointer.
729 llvm::FunctionCallee getLoadClassrefFn() const {
730 // Add the non-lazy-bind attribute, since objc_loadClassref is likely to
733 // Also it is safe to make it readnone, since we never load or store the
734 // classref except by calling this function.
735 llvm::Type *params[] = { Int8PtrPtrTy };
736 llvm::FunctionCallee F = CGM.CreateRuntimeFunction(
737 llvm::FunctionType::get(ClassnfABIPtrTy, params, false),
739 llvm::AttributeList::get(CGM.getLLVMContext(),
740 llvm::AttributeList::FunctionIndex,
741 {llvm::Attribute::NonLazyBind,
742 llvm::Attribute::ReadNone,
743 llvm::Attribute::NoUnwind}));
744 if (!CGM.getTriple().isOSBinFormatCOFF())
745 cast<llvm::Function>(F.getCallee())->setLinkage(
746 llvm::Function::ExternalWeakLinkage);
751 llvm::StructType *EHTypeTy;
752 llvm::Type *EHTypePtrTy;
754 ObjCNonFragileABITypesHelper(CodeGen::CodeGenModule &cgm);
757 enum class ObjCLabelType {
764 class CGObjCCommonMac : public CodeGen::CGObjCRuntime {
770 SKIP_SCAN(unsigned _skip = 0, unsigned _scan = 0)
771 : skip(_skip), scan(_scan) {}
774 /// opcode for captured block variables layout 'instructions'.
775 /// In the following descriptions, 'I' is the value of the immediate field.
776 /// (field following the opcode).
778 enum BLOCK_LAYOUT_OPCODE {
779 /// An operator which affects how the following layout should be
781 /// I == 0: Halt interpretation and treat everything else as
782 /// a non-pointer. Note that this instruction is equal
784 /// I != 0: Currently unused.
785 BLOCK_LAYOUT_OPERATOR = 0,
787 /// The next I+1 bytes do not contain a value of object pointer type.
788 /// Note that this can leave the stream unaligned, meaning that
789 /// subsequent word-size instructions do not begin at a multiple of
790 /// the pointer size.
791 BLOCK_LAYOUT_NON_OBJECT_BYTES = 1,
793 /// The next I+1 words do not contain a value of object pointer type.
794 /// This is simply an optimized version of BLOCK_LAYOUT_BYTES for
795 /// when the required skip quantity is a multiple of the pointer size.
796 BLOCK_LAYOUT_NON_OBJECT_WORDS = 2,
798 /// The next I+1 words are __strong pointers to Objective-C
799 /// objects or blocks.
800 BLOCK_LAYOUT_STRONG = 3,
802 /// The next I+1 words are pointers to __block variables.
803 BLOCK_LAYOUT_BYREF = 4,
805 /// The next I+1 words are __weak pointers to Objective-C
806 /// objects or blocks.
807 BLOCK_LAYOUT_WEAK = 5,
809 /// The next I+1 words are __unsafe_unretained pointers to
810 /// Objective-C objects or blocks.
811 BLOCK_LAYOUT_UNRETAINED = 6
813 /// The next I+1 words are block or object pointers with some
814 /// as-yet-unspecified ownership semantics. If we add more
815 /// flavors of ownership semantics, values will be taken from
818 /// This is included so that older tools can at least continue
819 /// processing the layout past such things.
820 //BLOCK_LAYOUT_OWNERSHIP_UNKNOWN = 7..10,
822 /// All other opcodes are reserved. Halt interpretation and
823 /// treat everything else as opaque.
828 enum BLOCK_LAYOUT_OPCODE opcode;
829 CharUnits block_var_bytepos;
830 CharUnits block_var_size;
831 RUN_SKIP(enum BLOCK_LAYOUT_OPCODE Opcode = BLOCK_LAYOUT_OPERATOR,
832 CharUnits BytePos = CharUnits::Zero(),
833 CharUnits Size = CharUnits::Zero())
834 : opcode(Opcode), block_var_bytepos(BytePos), block_var_size(Size) {}
836 // Allow sorting based on byte pos.
837 bool operator<(const RUN_SKIP &b) const {
838 return block_var_bytepos < b.block_var_bytepos;
843 llvm::LLVMContext &VMContext;
844 // FIXME! May not be needing this after all.
847 // arc/mrr layout of captured block literal variables.
848 SmallVector<RUN_SKIP, 16> RunSkipBlockVars;
850 /// LazySymbols - Symbols to generate a lazy reference for. See
851 /// DefinedSymbols and FinishModule().
852 llvm::SetVector<IdentifierInfo*> LazySymbols;
854 /// DefinedSymbols - External symbols which are defined by this
855 /// module. The symbols in this list and LazySymbols are used to add
856 /// special linker symbols which ensure that Objective-C modules are
858 llvm::SetVector<IdentifierInfo*> DefinedSymbols;
860 /// ClassNames - uniqued class names.
861 llvm::StringMap<llvm::GlobalVariable*> ClassNames;
863 /// MethodVarNames - uniqued method variable names.
864 llvm::DenseMap<Selector, llvm::GlobalVariable*> MethodVarNames;
866 /// DefinedCategoryNames - list of category names in form Class_Category.
867 llvm::SmallSetVector<llvm::CachedHashString, 16> DefinedCategoryNames;
869 /// MethodVarTypes - uniqued method type signatures. We have to use
870 /// a StringMap here because have no other unique reference.
871 llvm::StringMap<llvm::GlobalVariable*> MethodVarTypes;
873 /// MethodDefinitions - map of methods which have been defined in
874 /// this translation unit.
875 llvm::DenseMap<const ObjCMethodDecl*, llvm::Function*> MethodDefinitions;
877 /// PropertyNames - uniqued method variable names.
878 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> PropertyNames;
880 /// ClassReferences - uniqued class references.
881 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> ClassReferences;
883 /// SelectorReferences - uniqued selector references.
884 llvm::DenseMap<Selector, llvm::GlobalVariable*> SelectorReferences;
886 /// Protocols - Protocols for which an objc_protocol structure has
887 /// been emitted. Forward declarations are handled by creating an
888 /// empty structure whose initializer is filled in when/if defined.
889 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> Protocols;
891 /// DefinedProtocols - Protocols which have actually been
892 /// defined. We should not need this, see FIXME in GenerateProtocol.
893 llvm::DenseSet<IdentifierInfo*> DefinedProtocols;
895 /// DefinedClasses - List of defined classes.
896 SmallVector<llvm::GlobalValue*, 16> DefinedClasses;
898 /// ImplementedClasses - List of @implemented classes.
899 SmallVector<const ObjCInterfaceDecl*, 16> ImplementedClasses;
901 /// DefinedNonLazyClasses - List of defined "non-lazy" classes.
902 SmallVector<llvm::GlobalValue*, 16> DefinedNonLazyClasses;
904 /// DefinedCategories - List of defined categories.
905 SmallVector<llvm::GlobalValue*, 16> DefinedCategories;
907 /// DefinedStubCategories - List of defined categories on class stubs.
908 SmallVector<llvm::GlobalValue*, 16> DefinedStubCategories;
910 /// DefinedNonLazyCategories - List of defined "non-lazy" categories.
911 SmallVector<llvm::GlobalValue*, 16> DefinedNonLazyCategories;
913 /// Cached reference to the class for constant strings. This value has type
914 /// int * but is actually an Obj-C class pointer.
915 llvm::WeakTrackingVH ConstantStringClassRef;
917 /// The LLVM type corresponding to NSConstantString.
918 llvm::StructType *NSConstantStringType = nullptr;
920 llvm::StringMap<llvm::GlobalVariable *> NSConstantStringMap;
922 /// GetNameForMethod - Return a name for the given method.
923 /// \param[out] NameOut - The return value.
924 void GetNameForMethod(const ObjCMethodDecl *OMD,
925 const ObjCContainerDecl *CD,
926 SmallVectorImpl<char> &NameOut);
928 /// GetMethodVarName - Return a unique constant for the given
929 /// selector's name. The return value has type char *.
930 llvm::Constant *GetMethodVarName(Selector Sel);
931 llvm::Constant *GetMethodVarName(IdentifierInfo *Ident);
933 /// GetMethodVarType - Return a unique constant for the given
934 /// method's type encoding string. The return value has type char *.
936 // FIXME: This is a horrible name.
937 llvm::Constant *GetMethodVarType(const ObjCMethodDecl *D,
938 bool Extended = false);
939 llvm::Constant *GetMethodVarType(const FieldDecl *D);
941 /// GetPropertyName - Return a unique constant for the given
942 /// name. The return value has type char *.
943 llvm::Constant *GetPropertyName(IdentifierInfo *Ident);
945 // FIXME: This can be dropped once string functions are unified.
946 llvm::Constant *GetPropertyTypeString(const ObjCPropertyDecl *PD,
947 const Decl *Container);
949 /// GetClassName - Return a unique constant for the given selector's
950 /// runtime name (which may change via use of objc_runtime_name attribute on
951 /// class or protocol definition. The return value has type char *.
952 llvm::Constant *GetClassName(StringRef RuntimeName);
954 llvm::Function *GetMethodDefinition(const ObjCMethodDecl *MD);
956 /// BuildIvarLayout - Builds ivar layout bitmap for the class
957 /// implementation for the __strong or __weak case.
959 /// \param hasMRCWeakIvars - Whether we are compiling in MRC and there
960 /// are any weak ivars defined directly in the class. Meaningless unless
961 /// building a weak layout. Does not guarantee that the layout will
962 /// actually have any entries, because the ivar might be under-aligned.
963 llvm::Constant *BuildIvarLayout(const ObjCImplementationDecl *OI,
964 CharUnits beginOffset,
966 bool forStrongLayout,
967 bool hasMRCWeakIvars);
969 llvm::Constant *BuildStrongIvarLayout(const ObjCImplementationDecl *OI,
970 CharUnits beginOffset,
971 CharUnits endOffset) {
972 return BuildIvarLayout(OI, beginOffset, endOffset, true, false);
975 llvm::Constant *BuildWeakIvarLayout(const ObjCImplementationDecl *OI,
976 CharUnits beginOffset,
978 bool hasMRCWeakIvars) {
979 return BuildIvarLayout(OI, beginOffset, endOffset, false, hasMRCWeakIvars);
982 Qualifiers::ObjCLifetime getBlockCaptureLifetime(QualType QT, bool ByrefLayout);
984 void UpdateRunSkipBlockVars(bool IsByref,
985 Qualifiers::ObjCLifetime LifeTime,
986 CharUnits FieldOffset,
987 CharUnits FieldSize);
989 void BuildRCBlockVarRecordLayout(const RecordType *RT,
990 CharUnits BytePos, bool &HasUnion,
991 bool ByrefLayout=false);
993 void BuildRCRecordLayout(const llvm::StructLayout *RecLayout,
994 const RecordDecl *RD,
995 ArrayRef<const FieldDecl*> RecFields,
996 CharUnits BytePos, bool &HasUnion,
999 uint64_t InlineLayoutInstruction(SmallVectorImpl<unsigned char> &Layout);
1001 llvm::Constant *getBitmapBlockLayout(bool ComputeByrefLayout);
1003 /// GetIvarLayoutName - Returns a unique constant for the given
1004 /// ivar layout bitmap.
1005 llvm::Constant *GetIvarLayoutName(IdentifierInfo *Ident,
1006 const ObjCCommonTypesHelper &ObjCTypes);
1008 /// EmitPropertyList - Emit the given property list. The return
1009 /// value has type PropertyListPtrTy.
1010 llvm::Constant *EmitPropertyList(Twine Name,
1011 const Decl *Container,
1012 const ObjCContainerDecl *OCD,
1013 const ObjCCommonTypesHelper &ObjCTypes,
1014 bool IsClassProperty);
1016 /// EmitProtocolMethodTypes - Generate the array of extended method type
1017 /// strings. The return value has type Int8PtrPtrTy.
1018 llvm::Constant *EmitProtocolMethodTypes(Twine Name,
1019 ArrayRef<llvm::Constant*> MethodTypes,
1020 const ObjCCommonTypesHelper &ObjCTypes);
1022 /// GetProtocolRef - Return a reference to the internal protocol
1023 /// description, creating an empty one if it has not been
1024 /// defined. The return value has type ProtocolPtrTy.
1025 llvm::Constant *GetProtocolRef(const ObjCProtocolDecl *PD);
1027 /// Return a reference to the given Class using runtime calls rather than
1028 /// by a symbol reference.
1029 llvm::Value *EmitClassRefViaRuntime(CodeGenFunction &CGF,
1030 const ObjCInterfaceDecl *ID,
1031 ObjCCommonTypesHelper &ObjCTypes);
1033 std::string GetSectionName(StringRef Section, StringRef MachOAttributes);
1036 /// CreateMetadataVar - Create a global variable with internal
1037 /// linkage for use by the Objective-C runtime.
1039 /// This is a convenience wrapper which not only creates the
1040 /// variable, but also sets the section and alignment and adds the
1041 /// global to the "llvm.used" list.
1043 /// \param Name - The variable name.
1044 /// \param Init - The variable initializer; this is also used to
1045 /// define the type of the variable.
1046 /// \param Section - The section the variable should go into, or empty.
1047 /// \param Align - The alignment for the variable, or 0.
1048 /// \param AddToUsed - Whether the variable should be added to
1050 llvm::GlobalVariable *CreateMetadataVar(Twine Name,
1051 ConstantStructBuilder &Init,
1052 StringRef Section, CharUnits Align,
1054 llvm::GlobalVariable *CreateMetadataVar(Twine Name,
1055 llvm::Constant *Init,
1056 StringRef Section, CharUnits Align,
1059 llvm::GlobalVariable *CreateCStringLiteral(StringRef Name,
1060 ObjCLabelType LabelType,
1061 bool ForceNonFragileABI = false,
1062 bool NullTerminate = true);
1065 CodeGen::RValue EmitMessageSend(CodeGen::CodeGenFunction &CGF,
1066 ReturnValueSlot Return,
1067 QualType ResultType,
1072 const CallArgList &CallArgs,
1073 const ObjCMethodDecl *OMD,
1074 const ObjCInterfaceDecl *ClassReceiver,
1075 const ObjCCommonTypesHelper &ObjCTypes);
1077 /// EmitImageInfo - Emit the image info marker used to encode some module
1078 /// level information.
1079 void EmitImageInfo();
1082 CGObjCCommonMac(CodeGen::CodeGenModule &cgm) :
1083 CGObjCRuntime(cgm), VMContext(cgm.getLLVMContext()) { }
1085 bool isNonFragileABI() const {
1086 return ObjCABI == 2;
1089 ConstantAddress GenerateConstantString(const StringLiteral *SL) override;
1090 ConstantAddress GenerateConstantNSString(const StringLiteral *SL);
1092 llvm::Function *GenerateMethod(const ObjCMethodDecl *OMD,
1093 const ObjCContainerDecl *CD=nullptr) override;
1095 void GenerateProtocol(const ObjCProtocolDecl *PD) override;
1097 /// GetOrEmitProtocol - Get the protocol object for the given
1098 /// declaration, emitting it if necessary. The return value has type
1100 virtual llvm::Constant *GetOrEmitProtocol(const ObjCProtocolDecl *PD)=0;
1102 /// GetOrEmitProtocolRef - Get a forward reference to the protocol
1103 /// object for the given declaration, emitting it if needed. These
1104 /// forward references will be filled in with empty bodies if no
1105 /// definition is seen. The return value has type ProtocolPtrTy.
1106 virtual llvm::Constant *GetOrEmitProtocolRef(const ObjCProtocolDecl *PD)=0;
1108 virtual llvm::Constant *getNSConstantStringClassRef() = 0;
1110 llvm::Constant *BuildGCBlockLayout(CodeGen::CodeGenModule &CGM,
1111 const CGBlockInfo &blockInfo) override;
1112 llvm::Constant *BuildRCBlockLayout(CodeGen::CodeGenModule &CGM,
1113 const CGBlockInfo &blockInfo) override;
1114 std::string getRCBlockLayoutStr(CodeGen::CodeGenModule &CGM,
1115 const CGBlockInfo &blockInfo) override;
1117 llvm::Constant *BuildByrefLayout(CodeGen::CodeGenModule &CGM,
1118 QualType T) override;
1121 void fillRunSkipBlockVars(CodeGenModule &CGM, const CGBlockInfo &blockInfo);
1126 enum class MethodListType {
1127 CategoryInstanceMethods,
1128 CategoryClassMethods,
1131 ProtocolInstanceMethods,
1132 ProtocolClassMethods,
1133 OptionalProtocolInstanceMethods,
1134 OptionalProtocolClassMethods,
1137 /// A convenience class for splitting the methods of a protocol into
1138 /// the four interesting groups.
1139 class ProtocolMethodLists {
1142 RequiredInstanceMethods,
1143 RequiredClassMethods,
1144 OptionalInstanceMethods,
1145 OptionalClassMethods
1148 NumProtocolMethodLists = 4
1151 static MethodListType getMethodListKind(Kind kind) {
1153 case RequiredInstanceMethods:
1154 return MethodListType::ProtocolInstanceMethods;
1155 case RequiredClassMethods:
1156 return MethodListType::ProtocolClassMethods;
1157 case OptionalInstanceMethods:
1158 return MethodListType::OptionalProtocolInstanceMethods;
1159 case OptionalClassMethods:
1160 return MethodListType::OptionalProtocolClassMethods;
1162 llvm_unreachable("bad kind");
1165 SmallVector<const ObjCMethodDecl *, 4> Methods[NumProtocolMethodLists];
1167 static ProtocolMethodLists get(const ObjCProtocolDecl *PD) {
1168 ProtocolMethodLists result;
1170 for (auto MD : PD->methods()) {
1171 size_t index = (2 * size_t(MD->isOptional()))
1172 + (size_t(MD->isClassMethod()));
1173 result.Methods[index].push_back(MD);
1179 template <class Self>
1180 SmallVector<llvm::Constant*, 8> emitExtendedTypesArray(Self *self) const {
1181 // In both ABIs, the method types list is parallel with the
1182 // concatenation of the methods arrays in the following order:
1185 // optional instance methods
1186 // optional class methods
1187 SmallVector<llvm::Constant*, 8> result;
1189 // Methods is already in the correct order for both ABIs.
1190 for (auto &list : Methods) {
1191 for (auto MD : list) {
1192 result.push_back(self->GetMethodVarType(MD, true));
1199 template <class Self>
1200 llvm::Constant *emitMethodList(Self *self, const ObjCProtocolDecl *PD,
1202 return self->emitMethodList(PD->getObjCRuntimeNameAsString(),
1203 getMethodListKind(kind), Methods[kind]);
1207 } // end anonymous namespace
1209 class CGObjCMac : public CGObjCCommonMac {
1211 friend ProtocolMethodLists;
1213 ObjCTypesHelper ObjCTypes;
1215 /// EmitModuleInfo - Another marker encoding module level
1217 void EmitModuleInfo();
1219 /// EmitModuleSymols - Emit module symbols, the list of defined
1220 /// classes and categories. The result has type SymtabPtrTy.
1221 llvm::Constant *EmitModuleSymbols();
1223 /// FinishModule - Write out global data structures at the end of
1224 /// processing a translation unit.
1225 void FinishModule();
1227 /// EmitClassExtension - Generate the class extension structure used
1228 /// to store the weak ivar layout and properties. The return value
1229 /// has type ClassExtensionPtrTy.
1230 llvm::Constant *EmitClassExtension(const ObjCImplementationDecl *ID,
1231 CharUnits instanceSize,
1232 bool hasMRCWeakIvars,
1235 /// EmitClassRef - Return a Value*, of type ObjCTypes.ClassPtrTy,
1236 /// for the given class.
1237 llvm::Value *EmitClassRef(CodeGenFunction &CGF,
1238 const ObjCInterfaceDecl *ID);
1240 llvm::Value *EmitClassRefFromId(CodeGenFunction &CGF,
1241 IdentifierInfo *II);
1243 llvm::Value *EmitNSAutoreleasePoolClassRef(CodeGenFunction &CGF) override;
1245 /// EmitSuperClassRef - Emits reference to class's main metadata class.
1246 llvm::Value *EmitSuperClassRef(const ObjCInterfaceDecl *ID);
1248 /// EmitIvarList - Emit the ivar list for the given
1249 /// implementation. If ForClass is true the list of class ivars
1250 /// (i.e. metaclass ivars) is emitted, otherwise the list of
1251 /// interface ivars will be emitted. The return value has type
1253 llvm::Constant *EmitIvarList(const ObjCImplementationDecl *ID,
1256 /// EmitMetaClass - Emit a forward reference to the class structure
1257 /// for the metaclass of the given interface. The return value has
1258 /// type ClassPtrTy.
1259 llvm::Constant *EmitMetaClassRef(const ObjCInterfaceDecl *ID);
1261 /// EmitMetaClass - Emit a class structure for the metaclass of the
1262 /// given implementation. The return value has type ClassPtrTy.
1263 llvm::Constant *EmitMetaClass(const ObjCImplementationDecl *ID,
1264 llvm::Constant *Protocols,
1265 ArrayRef<const ObjCMethodDecl *> Methods);
1267 void emitMethodConstant(ConstantArrayBuilder &builder,
1268 const ObjCMethodDecl *MD);
1270 void emitMethodDescriptionConstant(ConstantArrayBuilder &builder,
1271 const ObjCMethodDecl *MD);
1273 /// EmitMethodList - Emit the method list for the given
1274 /// implementation. The return value has type MethodListPtrTy.
1275 llvm::Constant *emitMethodList(Twine Name, MethodListType MLT,
1276 ArrayRef<const ObjCMethodDecl *> Methods);
1278 /// GetOrEmitProtocol - Get the protocol object for the given
1279 /// declaration, emitting it if necessary. The return value has type
1281 llvm::Constant *GetOrEmitProtocol(const ObjCProtocolDecl *PD) override;
1283 /// GetOrEmitProtocolRef - Get a forward reference to the protocol
1284 /// object for the given declaration, emitting it if needed. These
1285 /// forward references will be filled in with empty bodies if no
1286 /// definition is seen. The return value has type ProtocolPtrTy.
1287 llvm::Constant *GetOrEmitProtocolRef(const ObjCProtocolDecl *PD) override;
1289 /// EmitProtocolExtension - Generate the protocol extension
1290 /// structure used to store optional instance and class methods, and
1291 /// protocol properties. The return value has type
1292 /// ProtocolExtensionPtrTy.
1294 EmitProtocolExtension(const ObjCProtocolDecl *PD,
1295 const ProtocolMethodLists &methodLists);
1297 /// EmitProtocolList - Generate the list of referenced
1298 /// protocols. The return value has type ProtocolListPtrTy.
1299 llvm::Constant *EmitProtocolList(Twine Name,
1300 ObjCProtocolDecl::protocol_iterator begin,
1301 ObjCProtocolDecl::protocol_iterator end);
1303 /// EmitSelector - Return a Value*, of type ObjCTypes.SelectorPtrTy,
1304 /// for the given selector.
1305 llvm::Value *EmitSelector(CodeGenFunction &CGF, Selector Sel);
1306 Address EmitSelectorAddr(CodeGenFunction &CGF, Selector Sel);
1309 CGObjCMac(CodeGen::CodeGenModule &cgm);
1311 llvm::Constant *getNSConstantStringClassRef() override;
1313 llvm::Function *ModuleInitFunction() override;
1315 CodeGen::RValue GenerateMessageSend(CodeGen::CodeGenFunction &CGF,
1316 ReturnValueSlot Return,
1317 QualType ResultType,
1318 Selector Sel, llvm::Value *Receiver,
1319 const CallArgList &CallArgs,
1320 const ObjCInterfaceDecl *Class,
1321 const ObjCMethodDecl *Method) override;
1324 GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF,
1325 ReturnValueSlot Return, QualType ResultType,
1326 Selector Sel, const ObjCInterfaceDecl *Class,
1327 bool isCategoryImpl, llvm::Value *Receiver,
1328 bool IsClassMessage, const CallArgList &CallArgs,
1329 const ObjCMethodDecl *Method) override;
1331 llvm::Value *GetClass(CodeGenFunction &CGF,
1332 const ObjCInterfaceDecl *ID) override;
1334 llvm::Value *GetSelector(CodeGenFunction &CGF, Selector Sel) override;
1335 Address GetAddrOfSelector(CodeGenFunction &CGF, Selector Sel) override;
1337 /// The NeXT/Apple runtimes do not support typed selectors; just emit an
1339 llvm::Value *GetSelector(CodeGenFunction &CGF,
1340 const ObjCMethodDecl *Method) override;
1342 llvm::Constant *GetEHType(QualType T) override;
1344 void GenerateCategory(const ObjCCategoryImplDecl *CMD) override;
1346 void GenerateClass(const ObjCImplementationDecl *ClassDecl) override;
1348 void RegisterAlias(const ObjCCompatibleAliasDecl *OAD) override {}
1350 llvm::Value *GenerateProtocolRef(CodeGenFunction &CGF,
1351 const ObjCProtocolDecl *PD) override;
1353 llvm::FunctionCallee GetPropertyGetFunction() override;
1354 llvm::FunctionCallee GetPropertySetFunction() override;
1355 llvm::FunctionCallee GetOptimizedPropertySetFunction(bool atomic,
1356 bool copy) override;
1357 llvm::FunctionCallee GetGetStructFunction() override;
1358 llvm::FunctionCallee GetSetStructFunction() override;
1359 llvm::FunctionCallee GetCppAtomicObjectGetFunction() override;
1360 llvm::FunctionCallee GetCppAtomicObjectSetFunction() override;
1361 llvm::FunctionCallee EnumerationMutationFunction() override;
1363 void EmitTryStmt(CodeGen::CodeGenFunction &CGF,
1364 const ObjCAtTryStmt &S) override;
1365 void EmitSynchronizedStmt(CodeGen::CodeGenFunction &CGF,
1366 const ObjCAtSynchronizedStmt &S) override;
1367 void EmitTryOrSynchronizedStmt(CodeGen::CodeGenFunction &CGF, const Stmt &S);
1368 void EmitThrowStmt(CodeGen::CodeGenFunction &CGF, const ObjCAtThrowStmt &S,
1369 bool ClearInsertionPoint=true) override;
1370 llvm::Value * EmitObjCWeakRead(CodeGen::CodeGenFunction &CGF,
1371 Address AddrWeakObj) override;
1372 void EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF,
1373 llvm::Value *src, Address dst) override;
1374 void EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF,
1375 llvm::Value *src, Address dest,
1376 bool threadlocal = false) override;
1377 void EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF,
1378 llvm::Value *src, Address dest,
1379 llvm::Value *ivarOffset) override;
1380 void EmitObjCStrongCastAssign(CodeGen::CodeGenFunction &CGF,
1381 llvm::Value *src, Address dest) override;
1382 void EmitGCMemmoveCollectable(CodeGen::CodeGenFunction &CGF,
1383 Address dest, Address src,
1384 llvm::Value *size) override;
1386 LValue EmitObjCValueForIvar(CodeGen::CodeGenFunction &CGF, QualType ObjectTy,
1387 llvm::Value *BaseValue, const ObjCIvarDecl *Ivar,
1388 unsigned CVRQualifiers) override;
1389 llvm::Value *EmitIvarOffset(CodeGen::CodeGenFunction &CGF,
1390 const ObjCInterfaceDecl *Interface,
1391 const ObjCIvarDecl *Ivar) override;
1394 class CGObjCNonFragileABIMac : public CGObjCCommonMac {
1396 friend ProtocolMethodLists;
1397 ObjCNonFragileABITypesHelper ObjCTypes;
1398 llvm::GlobalVariable* ObjCEmptyCacheVar;
1399 llvm::Constant* ObjCEmptyVtableVar;
1401 /// SuperClassReferences - uniqued super class references.
1402 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> SuperClassReferences;
1404 /// MetaClassReferences - uniqued meta class references.
1405 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> MetaClassReferences;
1407 /// EHTypeReferences - uniqued class ehtype references.
1408 llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> EHTypeReferences;
1410 /// VTableDispatchMethods - List of methods for which we generate
1411 /// vtable-based message dispatch.
1412 llvm::DenseSet<Selector> VTableDispatchMethods;
1414 /// DefinedMetaClasses - List of defined meta-classes.
1415 std::vector<llvm::GlobalValue*> DefinedMetaClasses;
1417 /// isVTableDispatchedSelector - Returns true if SEL is a
1418 /// vtable-based selector.
1419 bool isVTableDispatchedSelector(Selector Sel);
1421 /// FinishNonFragileABIModule - Write out global data structures at the end of
1422 /// processing a translation unit.
1423 void FinishNonFragileABIModule();
1425 /// AddModuleClassList - Add the given list of class pointers to the
1426 /// module with the provided symbol and section names.
1427 void AddModuleClassList(ArrayRef<llvm::GlobalValue *> Container,
1428 StringRef SymbolName, StringRef SectionName);
1430 llvm::GlobalVariable * BuildClassRoTInitializer(unsigned flags,
1431 unsigned InstanceStart,
1432 unsigned InstanceSize,
1433 const ObjCImplementationDecl *ID);
1434 llvm::GlobalVariable *BuildClassObject(const ObjCInterfaceDecl *CI,
1436 llvm::Constant *IsAGV,
1437 llvm::Constant *SuperClassGV,
1438 llvm::Constant *ClassRoGV,
1439 bool HiddenVisibility);
1441 void emitMethodConstant(ConstantArrayBuilder &builder,
1442 const ObjCMethodDecl *MD,
1445 /// Emit the method list for the given implementation. The return value
1446 /// has type MethodListnfABITy.
1447 llvm::Constant *emitMethodList(Twine Name, MethodListType MLT,
1448 ArrayRef<const ObjCMethodDecl *> Methods);
1450 /// EmitIvarList - Emit the ivar list for the given
1451 /// implementation. If ForClass is true the list of class ivars
1452 /// (i.e. metaclass ivars) is emitted, otherwise the list of
1453 /// interface ivars will be emitted. The return value has type
1454 /// IvarListnfABIPtrTy.
1455 llvm::Constant *EmitIvarList(const ObjCImplementationDecl *ID);
1457 llvm::Constant *EmitIvarOffsetVar(const ObjCInterfaceDecl *ID,
1458 const ObjCIvarDecl *Ivar,
1459 unsigned long int offset);
1461 /// GetOrEmitProtocol - Get the protocol object for the given
1462 /// declaration, emitting it if necessary. The return value has type
1464 llvm::Constant *GetOrEmitProtocol(const ObjCProtocolDecl *PD) override;
1466 /// GetOrEmitProtocolRef - Get a forward reference to the protocol
1467 /// object for the given declaration, emitting it if needed. These
1468 /// forward references will be filled in with empty bodies if no
1469 /// definition is seen. The return value has type ProtocolPtrTy.
1470 llvm::Constant *GetOrEmitProtocolRef(const ObjCProtocolDecl *PD) override;
1472 /// EmitProtocolList - Generate the list of referenced
1473 /// protocols. The return value has type ProtocolListPtrTy.
1474 llvm::Constant *EmitProtocolList(Twine Name,
1475 ObjCProtocolDecl::protocol_iterator begin,
1476 ObjCProtocolDecl::protocol_iterator end);
1478 CodeGen::RValue EmitVTableMessageSend(CodeGen::CodeGenFunction &CGF,
1479 ReturnValueSlot Return,
1480 QualType ResultType,
1482 llvm::Value *Receiver,
1485 const CallArgList &CallArgs,
1486 const ObjCMethodDecl *Method);
1488 /// GetClassGlobal - Return the global variable for the Objective-C
1489 /// class of the given name.
1490 llvm::Constant *GetClassGlobal(StringRef Name,
1491 ForDefinition_t IsForDefinition,
1492 bool Weak = false, bool DLLImport = false);
1493 llvm::Constant *GetClassGlobal(const ObjCInterfaceDecl *ID,
1495 ForDefinition_t isForDefinition);
1497 llvm::Constant *GetClassGlobalForClassRef(const ObjCInterfaceDecl *ID);
1499 llvm::Value *EmitLoadOfClassRef(CodeGenFunction &CGF,
1500 const ObjCInterfaceDecl *ID,
1501 llvm::GlobalVariable *Entry);
1503 /// EmitClassRef - Return a Value*, of type ObjCTypes.ClassPtrTy,
1504 /// for the given class reference.
1505 llvm::Value *EmitClassRef(CodeGenFunction &CGF,
1506 const ObjCInterfaceDecl *ID);
1508 llvm::Value *EmitClassRefFromId(CodeGenFunction &CGF,
1510 const ObjCInterfaceDecl *ID);
1512 llvm::Value *EmitNSAutoreleasePoolClassRef(CodeGenFunction &CGF) override;
1514 /// EmitSuperClassRef - Return a Value*, of type ObjCTypes.ClassPtrTy,
1515 /// for the given super class reference.
1516 llvm::Value *EmitSuperClassRef(CodeGenFunction &CGF,
1517 const ObjCInterfaceDecl *ID);
1519 /// EmitMetaClassRef - Return a Value * of the address of _class_t
1521 llvm::Value *EmitMetaClassRef(CodeGenFunction &CGF,
1522 const ObjCInterfaceDecl *ID, bool Weak);
1524 /// ObjCIvarOffsetVariable - Returns the ivar offset variable for
1527 llvm::GlobalVariable * ObjCIvarOffsetVariable(
1528 const ObjCInterfaceDecl *ID,
1529 const ObjCIvarDecl *Ivar);
1531 /// EmitSelector - Return a Value*, of type ObjCTypes.SelectorPtrTy,
1532 /// for the given selector.
1533 llvm::Value *EmitSelector(CodeGenFunction &CGF, Selector Sel);
1534 Address EmitSelectorAddr(CodeGenFunction &CGF, Selector Sel);
1536 /// GetInterfaceEHType - Get the cached ehtype for the given Objective-C
1537 /// interface. The return value has type EHTypePtrTy.
1538 llvm::Constant *GetInterfaceEHType(const ObjCInterfaceDecl *ID,
1539 ForDefinition_t IsForDefinition);
1541 StringRef getMetaclassSymbolPrefix() const { return "OBJC_METACLASS_$_"; }
1543 StringRef getClassSymbolPrefix() const { return "OBJC_CLASS_$_"; }
1545 void GetClassSizeInfo(const ObjCImplementationDecl *OID,
1546 uint32_t &InstanceStart,
1547 uint32_t &InstanceSize);
1549 // Shamelessly stolen from Analysis/CFRefCount.cpp
1550 Selector GetNullarySelector(const char* name) const {
1551 IdentifierInfo* II = &CGM.getContext().Idents.get(name);
1552 return CGM.getContext().Selectors.getSelector(0, &II);
1555 Selector GetUnarySelector(const char* name) const {
1556 IdentifierInfo* II = &CGM.getContext().Idents.get(name);
1557 return CGM.getContext().Selectors.getSelector(1, &II);
1560 /// ImplementationIsNonLazy - Check whether the given category or
1561 /// class implementation is "non-lazy".
1562 bool ImplementationIsNonLazy(const ObjCImplDecl *OD) const;
1564 bool IsIvarOffsetKnownIdempotent(const CodeGen::CodeGenFunction &CGF,
1565 const ObjCIvarDecl *IV) {
1566 // Annotate the load as an invariant load iff inside an instance method
1567 // and ivar belongs to instance method's class and one of its super class.
1568 // This check is needed because the ivar offset is a lazily
1569 // initialised value that may depend on objc_msgSend to perform a fixup on
1570 // the first message dispatch.
1572 // An additional opportunity to mark the load as invariant arises when the
1573 // base of the ivar access is a parameter to an Objective C method.
1574 // However, because the parameters are not available in the current
1575 // interface, we cannot perform this check.
1576 if (const ObjCMethodDecl *MD =
1577 dyn_cast_or_null<ObjCMethodDecl>(CGF.CurFuncDecl))
1578 if (MD->isInstanceMethod())
1579 if (const ObjCInterfaceDecl *ID = MD->getClassInterface())
1580 return IV->getContainingInterface()->isSuperClassOf(ID);
1584 bool isClassLayoutKnownStatically(const ObjCInterfaceDecl *ID) {
1585 // NSObject is a fixed size. If we can see the @implementation of a class
1586 // which inherits from NSObject then we know that all it's offsets also must
1587 // be fixed. FIXME: Can we do this if see a chain of super classes with
1588 // implementations leading to NSObject?
1589 return ID->getImplementation() && ID->getSuperClass() &&
1590 ID->getSuperClass()->getName() == "NSObject";
1594 CGObjCNonFragileABIMac(CodeGen::CodeGenModule &cgm);
1596 llvm::Constant *getNSConstantStringClassRef() override;
1598 llvm::Function *ModuleInitFunction() override;
1600 CodeGen::RValue GenerateMessageSend(CodeGen::CodeGenFunction &CGF,
1601 ReturnValueSlot Return,
1602 QualType ResultType, Selector Sel,
1603 llvm::Value *Receiver,
1604 const CallArgList &CallArgs,
1605 const ObjCInterfaceDecl *Class,
1606 const ObjCMethodDecl *Method) override;
1609 GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF,
1610 ReturnValueSlot Return, QualType ResultType,
1611 Selector Sel, const ObjCInterfaceDecl *Class,
1612 bool isCategoryImpl, llvm::Value *Receiver,
1613 bool IsClassMessage, const CallArgList &CallArgs,
1614 const ObjCMethodDecl *Method) override;
1616 llvm::Value *GetClass(CodeGenFunction &CGF,
1617 const ObjCInterfaceDecl *ID) override;
1619 llvm::Value *GetSelector(CodeGenFunction &CGF, Selector Sel) override
1620 { return EmitSelector(CGF, Sel); }
1621 Address GetAddrOfSelector(CodeGenFunction &CGF, Selector Sel) override
1622 { return EmitSelectorAddr(CGF, Sel); }
1624 /// The NeXT/Apple runtimes do not support typed selectors; just emit an
1626 llvm::Value *GetSelector(CodeGenFunction &CGF,
1627 const ObjCMethodDecl *Method) override
1628 { return EmitSelector(CGF, Method->getSelector()); }
1630 void GenerateCategory(const ObjCCategoryImplDecl *CMD) override;
1632 void GenerateClass(const ObjCImplementationDecl *ClassDecl) override;
1634 void RegisterAlias(const ObjCCompatibleAliasDecl *OAD) override {}
1636 llvm::Value *GenerateProtocolRef(CodeGenFunction &CGF,
1637 const ObjCProtocolDecl *PD) override;
1639 llvm::Constant *GetEHType(QualType T) override;
1641 llvm::FunctionCallee GetPropertyGetFunction() override {
1642 return ObjCTypes.getGetPropertyFn();
1644 llvm::FunctionCallee GetPropertySetFunction() override {
1645 return ObjCTypes.getSetPropertyFn();
1648 llvm::FunctionCallee GetOptimizedPropertySetFunction(bool atomic,
1649 bool copy) override {
1650 return ObjCTypes.getOptimizedSetPropertyFn(atomic, copy);
1653 llvm::FunctionCallee GetSetStructFunction() override {
1654 return ObjCTypes.getCopyStructFn();
1657 llvm::FunctionCallee GetGetStructFunction() override {
1658 return ObjCTypes.getCopyStructFn();
1661 llvm::FunctionCallee GetCppAtomicObjectSetFunction() override {
1662 return ObjCTypes.getCppAtomicObjectFunction();
1665 llvm::FunctionCallee GetCppAtomicObjectGetFunction() override {
1666 return ObjCTypes.getCppAtomicObjectFunction();
1669 llvm::FunctionCallee EnumerationMutationFunction() override {
1670 return ObjCTypes.getEnumerationMutationFn();
1673 void EmitTryStmt(CodeGen::CodeGenFunction &CGF,
1674 const ObjCAtTryStmt &S) override;
1675 void EmitSynchronizedStmt(CodeGen::CodeGenFunction &CGF,
1676 const ObjCAtSynchronizedStmt &S) override;
1677 void EmitThrowStmt(CodeGen::CodeGenFunction &CGF, const ObjCAtThrowStmt &S,
1678 bool ClearInsertionPoint=true) override;
1679 llvm::Value * EmitObjCWeakRead(CodeGen::CodeGenFunction &CGF,
1680 Address AddrWeakObj) override;
1681 void EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF,
1682 llvm::Value *src, Address edst) override;
1683 void EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF,
1684 llvm::Value *src, Address dest,
1685 bool threadlocal = false) override;
1686 void EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF,
1687 llvm::Value *src, Address dest,
1688 llvm::Value *ivarOffset) override;
1689 void EmitObjCStrongCastAssign(CodeGen::CodeGenFunction &CGF,
1690 llvm::Value *src, Address dest) override;
1691 void EmitGCMemmoveCollectable(CodeGen::CodeGenFunction &CGF,
1692 Address dest, Address src,
1693 llvm::Value *size) override;
1694 LValue EmitObjCValueForIvar(CodeGen::CodeGenFunction &CGF, QualType ObjectTy,
1695 llvm::Value *BaseValue, const ObjCIvarDecl *Ivar,
1696 unsigned CVRQualifiers) override;
1697 llvm::Value *EmitIvarOffset(CodeGen::CodeGenFunction &CGF,
1698 const ObjCInterfaceDecl *Interface,
1699 const ObjCIvarDecl *Ivar) override;
1702 /// A helper class for performing the null-initialization of a return
1704 struct NullReturnState {
1705 llvm::BasicBlock *NullBB;
1706 NullReturnState() : NullBB(nullptr) {}
1708 /// Perform a null-check of the given receiver.
1709 void init(CodeGenFunction &CGF, llvm::Value *receiver) {
1710 // Make blocks for the null-receiver and call edges.
1711 NullBB = CGF.createBasicBlock("msgSend.null-receiver");
1712 llvm::BasicBlock *callBB = CGF.createBasicBlock("msgSend.call");
1714 // Check for a null receiver and, if there is one, jump to the
1715 // null-receiver block. There's no point in trying to avoid it:
1716 // we're always going to put *something* there, because otherwise
1717 // we shouldn't have done this null-check in the first place.
1718 llvm::Value *isNull = CGF.Builder.CreateIsNull(receiver);
1719 CGF.Builder.CreateCondBr(isNull, NullBB, callBB);
1721 // Otherwise, start performing the call.
1722 CGF.EmitBlock(callBB);
1725 /// Complete the null-return operation. It is valid to call this
1726 /// regardless of whether 'init' has been called.
1727 RValue complete(CodeGenFunction &CGF,
1728 ReturnValueSlot returnSlot,
1730 QualType resultType,
1731 const CallArgList &CallArgs,
1732 const ObjCMethodDecl *Method) {
1733 // If we never had to do a null-check, just use the raw result.
1734 if (!NullBB) return result;
1736 // The continuation block. This will be left null if we don't have an
1737 // IP, which can happen if the method we're calling is marked noreturn.
1738 llvm::BasicBlock *contBB = nullptr;
1740 // Finish the call path.
1741 llvm::BasicBlock *callBB = CGF.Builder.GetInsertBlock();
1743 contBB = CGF.createBasicBlock("msgSend.cont");
1744 CGF.Builder.CreateBr(contBB);
1747 // Okay, start emitting the null-receiver block.
1748 CGF.EmitBlock(NullBB);
1750 // Release any consumed arguments we've got.
1752 CallArgList::const_iterator I = CallArgs.begin();
1753 for (ObjCMethodDecl::param_const_iterator i = Method->param_begin(),
1754 e = Method->param_end(); i != e; ++i, ++I) {
1755 const ParmVarDecl *ParamDecl = (*i);
1756 if (ParamDecl->hasAttr<NSConsumedAttr>()) {
1757 RValue RV = I->getRValue(CGF);
1758 assert(RV.isScalar() &&
1759 "NullReturnState::complete - arg not on object");
1760 CGF.EmitARCRelease(RV.getScalarVal(), ARCImpreciseLifetime);
1765 // The phi code below assumes that we haven't needed any control flow yet.
1766 assert(CGF.Builder.GetInsertBlock() == NullBB);
1768 // If we've got a void return, just jump to the continuation block.
1769 if (result.isScalar() && resultType->isVoidType()) {
1770 // No jumps required if the message-send was noreturn.
1771 if (contBB) CGF.EmitBlock(contBB);
1775 // If we've got a scalar return, build a phi.
1776 if (result.isScalar()) {
1777 // Derive the null-initialization value.
1778 llvm::Constant *null = CGF.CGM.EmitNullConstant(resultType);
1780 // If no join is necessary, just flow out.
1781 if (!contBB) return RValue::get(null);
1783 // Otherwise, build a phi.
1784 CGF.EmitBlock(contBB);
1785 llvm::PHINode *phi = CGF.Builder.CreatePHI(null->getType(), 2);
1786 phi->addIncoming(result.getScalarVal(), callBB);
1787 phi->addIncoming(null, NullBB);
1788 return RValue::get(phi);
1791 // If we've got an aggregate return, null the buffer out.
1792 // FIXME: maybe we should be doing things differently for all the
1793 // cases where the ABI has us returning (1) non-agg values in
1794 // memory or (2) agg values in registers.
1795 if (result.isAggregate()) {
1796 assert(result.isAggregate() && "null init of non-aggregate result?");
1797 if (!returnSlot.isUnused())
1798 CGF.EmitNullInitialization(result.getAggregateAddress(), resultType);
1799 if (contBB) CGF.EmitBlock(contBB);
1804 CGF.EmitBlock(contBB);
1805 CodeGenFunction::ComplexPairTy callResult = result.getComplexVal();
1807 // Find the scalar type and its zero value.
1808 llvm::Type *scalarTy = callResult.first->getType();
1809 llvm::Constant *scalarZero = llvm::Constant::getNullValue(scalarTy);
1811 // Build phis for both coordinates.
1812 llvm::PHINode *real = CGF.Builder.CreatePHI(scalarTy, 2);
1813 real->addIncoming(callResult.first, callBB);
1814 real->addIncoming(scalarZero, NullBB);
1815 llvm::PHINode *imag = CGF.Builder.CreatePHI(scalarTy, 2);
1816 imag->addIncoming(callResult.second, callBB);
1817 imag->addIncoming(scalarZero, NullBB);
1818 return RValue::getComplex(real, imag);
1822 } // end anonymous namespace
1824 /* *** Helper Functions *** */
1826 /// getConstantGEP() - Help routine to construct simple GEPs.
1827 static llvm::Constant *getConstantGEP(llvm::LLVMContext &VMContext,
1828 llvm::GlobalVariable *C, unsigned idx0,
1830 llvm::Value *Idxs[] = {
1831 llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), idx0),
1832 llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), idx1)
1834 return llvm::ConstantExpr::getGetElementPtr(C->getValueType(), C, Idxs);
1837 /// hasObjCExceptionAttribute - Return true if this class or any super
1838 /// class has the __objc_exception__ attribute.
1839 static bool hasObjCExceptionAttribute(ASTContext &Context,
1840 const ObjCInterfaceDecl *OID) {
1841 if (OID->hasAttr<ObjCExceptionAttr>())
1843 if (const ObjCInterfaceDecl *Super = OID->getSuperClass())
1844 return hasObjCExceptionAttribute(Context, Super);
1848 static llvm::GlobalValue::LinkageTypes
1849 getLinkageTypeForObjCMetadata(CodeGenModule &CGM, StringRef Section) {
1850 if (CGM.getTriple().isOSBinFormatMachO() &&
1851 (Section.empty() || Section.startswith("__DATA")))
1852 return llvm::GlobalValue::InternalLinkage;
1853 return llvm::GlobalValue::PrivateLinkage;
1856 /// A helper function to create an internal or private global variable.
1857 static llvm::GlobalVariable *
1858 finishAndCreateGlobal(ConstantInitBuilder::StructBuilder &Builder,
1859 const llvm::Twine &Name, CodeGenModule &CGM) {
1860 std::string SectionName;
1861 if (CGM.getTriple().isOSBinFormatMachO())
1862 SectionName = "__DATA, __objc_const";
1863 auto *GV = Builder.finishAndCreateGlobal(
1864 Name, CGM.getPointerAlign(), /*constant*/ false,
1865 getLinkageTypeForObjCMetadata(CGM, SectionName));
1866 GV->setSection(SectionName);
1870 /* *** CGObjCMac Public Interface *** */
1872 CGObjCMac::CGObjCMac(CodeGen::CodeGenModule &cgm) : CGObjCCommonMac(cgm),
1878 /// GetClass - Return a reference to the class for the given interface
1880 llvm::Value *CGObjCMac::GetClass(CodeGenFunction &CGF,
1881 const ObjCInterfaceDecl *ID) {
1882 return EmitClassRef(CGF, ID);
1885 /// GetSelector - Return the pointer to the unique'd string for this selector.
1886 llvm::Value *CGObjCMac::GetSelector(CodeGenFunction &CGF, Selector Sel) {
1887 return EmitSelector(CGF, Sel);
1889 Address CGObjCMac::GetAddrOfSelector(CodeGenFunction &CGF, Selector Sel) {
1890 return EmitSelectorAddr(CGF, Sel);
1892 llvm::Value *CGObjCMac::GetSelector(CodeGenFunction &CGF, const ObjCMethodDecl
1894 return EmitSelector(CGF, Method->getSelector());
1897 llvm::Constant *CGObjCMac::GetEHType(QualType T) {
1898 if (T->isObjCIdType() ||
1899 T->isObjCQualifiedIdType()) {
1900 return CGM.GetAddrOfRTTIDescriptor(
1901 CGM.getContext().getObjCIdRedefinitionType(), /*ForEH=*/true);
1903 if (T->isObjCClassType() ||
1904 T->isObjCQualifiedClassType()) {
1905 return CGM.GetAddrOfRTTIDescriptor(
1906 CGM.getContext().getObjCClassRedefinitionType(), /*ForEH=*/true);
1908 if (T->isObjCObjectPointerType())
1909 return CGM.GetAddrOfRTTIDescriptor(T, /*ForEH=*/true);
1911 llvm_unreachable("asking for catch type for ObjC type in fragile runtime");
1914 /// Generate a constant CFString object.
1916 struct __builtin_CFString {
1917 const int *isa; // point to __CFConstantStringClassReference
1924 /// or Generate a constant NSString object.
1926 struct __builtin_NSString {
1927 const int *isa; // point to __NSConstantStringClassReference
1929 unsigned int length;
1934 CGObjCCommonMac::GenerateConstantString(const StringLiteral *SL) {
1935 return (!CGM.getLangOpts().NoConstantCFStrings
1936 ? CGM.GetAddrOfConstantCFString(SL)
1937 : GenerateConstantNSString(SL));
1940 static llvm::StringMapEntry<llvm::GlobalVariable *> &
1941 GetConstantStringEntry(llvm::StringMap<llvm::GlobalVariable *> &Map,
1942 const StringLiteral *Literal, unsigned &StringLength) {
1943 StringRef String = Literal->getString();
1944 StringLength = String.size();
1945 return *Map.insert(std::make_pair(String, nullptr)).first;
1948 llvm::Constant *CGObjCMac::getNSConstantStringClassRef() {
1949 if (llvm::Value *V = ConstantStringClassRef)
1950 return cast<llvm::Constant>(V);
1952 auto &StringClass = CGM.getLangOpts().ObjCConstantStringClass;
1954 StringClass.empty() ? "_NSConstantStringClassReference"
1955 : "_" + StringClass + "ClassReference";
1957 llvm::Type *PTy = llvm::ArrayType::get(CGM.IntTy, 0);
1958 auto GV = CGM.CreateRuntimeVariable(PTy, str);
1959 auto V = llvm::ConstantExpr::getBitCast(GV, CGM.IntTy->getPointerTo());
1960 ConstantStringClassRef = V;
1964 llvm::Constant *CGObjCNonFragileABIMac::getNSConstantStringClassRef() {
1965 if (llvm::Value *V = ConstantStringClassRef)
1966 return cast<llvm::Constant>(V);
1968 auto &StringClass = CGM.getLangOpts().ObjCConstantStringClass;
1970 StringClass.empty() ? "OBJC_CLASS_$_NSConstantString"
1971 : "OBJC_CLASS_$_" + StringClass;
1972 llvm::Constant *GV = GetClassGlobal(str, NotForDefinition);
1974 // Make sure the result is of the correct type.
1975 auto V = llvm::ConstantExpr::getBitCast(GV, CGM.IntTy->getPointerTo());
1977 ConstantStringClassRef = V;
1982 CGObjCCommonMac::GenerateConstantNSString(const StringLiteral *Literal) {
1983 unsigned StringLength = 0;
1984 llvm::StringMapEntry<llvm::GlobalVariable *> &Entry =
1985 GetConstantStringEntry(NSConstantStringMap, Literal, StringLength);
1987 if (auto *C = Entry.second)
1988 return ConstantAddress(C, CharUnits::fromQuantity(C->getAlignment()));
1990 // If we don't already have it, get _NSConstantStringClassReference.
1991 llvm::Constant *Class = getNSConstantStringClassRef();
1993 // If we don't already have it, construct the type for a constant NSString.
1994 if (!NSConstantStringType) {
1995 NSConstantStringType =
1996 llvm::StructType::create({
1997 CGM.Int32Ty->getPointerTo(),
2000 }, "struct.__builtin_NSString");
2003 ConstantInitBuilder Builder(CGM);
2004 auto Fields = Builder.beginStruct(NSConstantStringType);
2011 llvm::ConstantDataArray::getString(VMContext, Entry.first());
2013 llvm::GlobalValue::LinkageTypes Linkage = llvm::GlobalValue::PrivateLinkage;
2014 bool isConstant = !CGM.getLangOpts().WritableStrings;
2016 auto *GV = new llvm::GlobalVariable(CGM.getModule(), C->getType(), isConstant,
2017 Linkage, C, ".str");
2018 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
2019 // Don't enforce the target's minimum global alignment, since the only use
2020 // of the string is via this class initializer.
2021 GV->setAlignment(1);
2022 Fields.addBitCast(GV, CGM.Int8PtrTy);
2025 Fields.addInt(CGM.IntTy, StringLength);
2028 CharUnits Alignment = CGM.getPointerAlign();
2029 GV = Fields.finishAndCreateGlobal("_unnamed_nsstring_", Alignment,
2031 llvm::GlobalVariable::PrivateLinkage);
2032 const char *NSStringSection = "__OBJC,__cstring_object,regular,no_dead_strip";
2033 const char *NSStringNonFragileABISection =
2034 "__DATA,__objc_stringobj,regular,no_dead_strip";
2035 // FIXME. Fix section.
2036 GV->setSection(CGM.getLangOpts().ObjCRuntime.isNonFragile()
2037 ? NSStringNonFragileABISection
2041 return ConstantAddress(GV, Alignment);
2045 kCFTaggedObjectID_Integer = (1 << 1) + 1
2048 /// Generates a message send where the super is the receiver. This is
2049 /// a message send to self with special delivery semantics indicating
2050 /// which class's method should be called.
2052 CGObjCMac::GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF,
2053 ReturnValueSlot Return,
2054 QualType ResultType,
2056 const ObjCInterfaceDecl *Class,
2057 bool isCategoryImpl,
2058 llvm::Value *Receiver,
2059 bool IsClassMessage,
2060 const CodeGen::CallArgList &CallArgs,
2061 const ObjCMethodDecl *Method) {
2062 // Create and init a super structure; this is a (receiver, class)
2063 // pair we will pass to objc_msgSendSuper.
2065 CGF.CreateTempAlloca(ObjCTypes.SuperTy, CGF.getPointerAlign(),
2067 llvm::Value *ReceiverAsObject =
2068 CGF.Builder.CreateBitCast(Receiver, ObjCTypes.ObjectPtrTy);
2069 CGF.Builder.CreateStore(ReceiverAsObject,
2070 CGF.Builder.CreateStructGEP(ObjCSuper, 0));
2072 // If this is a class message the metaclass is passed as the target.
2073 llvm::Value *Target;
2074 if (IsClassMessage) {
2075 if (isCategoryImpl) {
2076 // Message sent to 'super' in a class method defined in a category
2077 // implementation requires an odd treatment.
2078 // If we are in a class method, we must retrieve the
2079 // _metaclass_ for the current class, pointed at by
2080 // the class's "isa" pointer. The following assumes that
2081 // isa" is the first ivar in a class (which it must be).
2082 Target = EmitClassRef(CGF, Class->getSuperClass());
2083 Target = CGF.Builder.CreateStructGEP(ObjCTypes.ClassTy, Target, 0);
2084 Target = CGF.Builder.CreateAlignedLoad(Target, CGF.getPointerAlign());
2086 llvm::Constant *MetaClassPtr = EmitMetaClassRef(Class);
2087 llvm::Value *SuperPtr =
2088 CGF.Builder.CreateStructGEP(ObjCTypes.ClassTy, MetaClassPtr, 1);
2089 llvm::Value *Super =
2090 CGF.Builder.CreateAlignedLoad(SuperPtr, CGF.getPointerAlign());
2093 } else if (isCategoryImpl)
2094 Target = EmitClassRef(CGF, Class->getSuperClass());
2096 llvm::Value *ClassPtr = EmitSuperClassRef(Class);
2097 ClassPtr = CGF.Builder.CreateStructGEP(ObjCTypes.ClassTy, ClassPtr, 1);
2098 Target = CGF.Builder.CreateAlignedLoad(ClassPtr, CGF.getPointerAlign());
2100 // FIXME: We shouldn't need to do this cast, rectify the ASTContext and
2102 llvm::Type *ClassTy =
2103 CGM.getTypes().ConvertType(CGF.getContext().getObjCClassType());
2104 Target = CGF.Builder.CreateBitCast(Target, ClassTy);
2105 CGF.Builder.CreateStore(Target, CGF.Builder.CreateStructGEP(ObjCSuper, 1));
2106 return EmitMessageSend(CGF, Return, ResultType,
2107 EmitSelector(CGF, Sel),
2108 ObjCSuper.getPointer(), ObjCTypes.SuperPtrCTy,
2109 true, CallArgs, Method, Class, ObjCTypes);
2112 /// Generate code for a message send expression.
2113 CodeGen::RValue CGObjCMac::GenerateMessageSend(CodeGen::CodeGenFunction &CGF,
2114 ReturnValueSlot Return,
2115 QualType ResultType,
2117 llvm::Value *Receiver,
2118 const CallArgList &CallArgs,
2119 const ObjCInterfaceDecl *Class,
2120 const ObjCMethodDecl *Method) {
2121 return EmitMessageSend(CGF, Return, ResultType,
2122 EmitSelector(CGF, Sel),
2123 Receiver, CGF.getContext().getObjCIdType(),
2124 false, CallArgs, Method, Class, ObjCTypes);
2127 static bool isWeakLinkedClass(const ObjCInterfaceDecl *ID) {
2129 if (ID->isWeakImported())
2131 } while ((ID = ID->getSuperClass()));
2137 CGObjCCommonMac::EmitMessageSend(CodeGen::CodeGenFunction &CGF,
2138 ReturnValueSlot Return,
2139 QualType ResultType,
2144 const CallArgList &CallArgs,
2145 const ObjCMethodDecl *Method,
2146 const ObjCInterfaceDecl *ClassReceiver,
2147 const ObjCCommonTypesHelper &ObjCTypes) {
2148 CallArgList ActualArgs;
2150 Arg0 = CGF.Builder.CreateBitCast(Arg0, ObjCTypes.ObjectPtrTy);
2151 ActualArgs.add(RValue::get(Arg0), Arg0Ty);
2152 ActualArgs.add(RValue::get(Sel), CGF.getContext().getObjCSelType());
2153 ActualArgs.addFrom(CallArgs);
2155 // If we're calling a method, use the formal signature.
2156 MessageSendInfo MSI = getMessageSendInfo(Method, ResultType, ActualArgs);
2159 assert(CGM.getContext().getCanonicalType(Method->getReturnType()) ==
2160 CGM.getContext().getCanonicalType(ResultType) &&
2161 "Result type mismatch!");
2163 bool ReceiverCanBeNull = true;
2165 // Super dispatch assumes that self is non-null; even the messenger
2166 // doesn't have a null check internally.
2168 ReceiverCanBeNull = false;
2170 // If this is a direct dispatch of a class method, check whether the class,
2171 // or anything in its hierarchy, was weak-linked.
2172 } else if (ClassReceiver && Method && Method->isClassMethod()) {
2173 ReceiverCanBeNull = isWeakLinkedClass(ClassReceiver);
2175 // If we're emitting a method, and self is const (meaning just ARC, for now),
2176 // and the receiver is a load of self, then self is a valid object.
2177 } else if (auto CurMethod =
2178 dyn_cast_or_null<ObjCMethodDecl>(CGF.CurCodeDecl)) {
2179 auto Self = CurMethod->getSelfDecl();
2180 if (Self->getType().isConstQualified()) {
2181 if (auto LI = dyn_cast<llvm::LoadInst>(Arg0->stripPointerCasts())) {
2182 llvm::Value *SelfAddr = CGF.GetAddrOfLocalVar(Self).getPointer();
2183 if (SelfAddr == LI->getPointerOperand()) {
2184 ReceiverCanBeNull = false;
2190 bool RequiresNullCheck = false;
2192 llvm::FunctionCallee Fn = nullptr;
2193 if (CGM.ReturnSlotInterferesWithArgs(MSI.CallInfo)) {
2194 if (ReceiverCanBeNull) RequiresNullCheck = true;
2195 Fn = (ObjCABI == 2) ? ObjCTypes.getSendStretFn2(IsSuper)
2196 : ObjCTypes.getSendStretFn(IsSuper);
2197 } else if (CGM.ReturnTypeUsesFPRet(ResultType)) {
2198 Fn = (ObjCABI == 2) ? ObjCTypes.getSendFpretFn2(IsSuper)
2199 : ObjCTypes.getSendFpretFn(IsSuper);
2200 } else if (CGM.ReturnTypeUsesFP2Ret(ResultType)) {
2201 Fn = (ObjCABI == 2) ? ObjCTypes.getSendFp2RetFn2(IsSuper)
2202 : ObjCTypes.getSendFp2retFn(IsSuper);
2204 // arm64 uses objc_msgSend for stret methods and yet null receiver check
2205 // must be made for it.
2206 if (ReceiverCanBeNull && CGM.ReturnTypeUsesSRet(MSI.CallInfo))
2207 RequiresNullCheck = true;
2208 Fn = (ObjCABI == 2) ? ObjCTypes.getSendFn2(IsSuper)
2209 : ObjCTypes.getSendFn(IsSuper);
2212 // Cast function to proper signature
2213 llvm::Constant *BitcastFn = cast<llvm::Constant>(
2214 CGF.Builder.CreateBitCast(Fn.getCallee(), MSI.MessengerType));
2216 // We don't need to emit a null check to zero out an indirect result if the
2217 // result is ignored.
2218 if (Return.isUnused())
2219 RequiresNullCheck = false;
2221 // Emit a null-check if there's a consumed argument other than the receiver.
2222 if (!RequiresNullCheck && CGM.getLangOpts().ObjCAutoRefCount && Method) {
2223 for (const auto *ParamDecl : Method->parameters()) {
2224 if (ParamDecl->hasAttr<NSConsumedAttr>()) {
2225 RequiresNullCheck = true;
2231 NullReturnState nullReturn;
2232 if (RequiresNullCheck) {
2233 nullReturn.init(CGF, Arg0);
2236 llvm::CallBase *CallSite;
2237 CGCallee Callee = CGCallee::forDirect(BitcastFn);
2238 RValue rvalue = CGF.EmitCall(MSI.CallInfo, Callee, Return, ActualArgs,
2241 // Mark the call as noreturn if the method is marked noreturn and the
2242 // receiver cannot be null.
2243 if (Method && Method->hasAttr<NoReturnAttr>() && !ReceiverCanBeNull) {
2244 CallSite->setDoesNotReturn();
2247 return nullReturn.complete(CGF, Return, rvalue, ResultType, CallArgs,
2248 RequiresNullCheck ? Method : nullptr);
2251 static Qualifiers::GC GetGCAttrTypeForType(ASTContext &Ctx, QualType FQT,
2252 bool pointee = false) {
2253 // Note that GC qualification applies recursively to C pointer types
2254 // that aren't otherwise decorated. This is weird, but it's probably
2255 // an intentional workaround to the unreliable placement of GC qualifiers.
2256 if (FQT.isObjCGCStrong())
2257 return Qualifiers::Strong;
2259 if (FQT.isObjCGCWeak())
2260 return Qualifiers::Weak;
2262 if (auto ownership = FQT.getObjCLifetime()) {
2263 // Ownership does not apply recursively to C pointer types.
2264 if (pointee) return Qualifiers::GCNone;
2265 switch (ownership) {
2266 case Qualifiers::OCL_Weak: return Qualifiers::Weak;
2267 case Qualifiers::OCL_Strong: return Qualifiers::Strong;
2268 case Qualifiers::OCL_ExplicitNone: return Qualifiers::GCNone;
2269 case Qualifiers::OCL_Autoreleasing: llvm_unreachable("autoreleasing ivar?");
2270 case Qualifiers::OCL_None: llvm_unreachable("known nonzero");
2272 llvm_unreachable("bad objc ownership");
2275 // Treat unqualified retainable pointers as strong.
2276 if (FQT->isObjCObjectPointerType() || FQT->isBlockPointerType())
2277 return Qualifiers::Strong;
2279 // Walk into C pointer types, but only in GC.
2280 if (Ctx.getLangOpts().getGC() != LangOptions::NonGC) {
2281 if (const PointerType *PT = FQT->getAs<PointerType>())
2282 return GetGCAttrTypeForType(Ctx, PT->getPointeeType(), /*pointee*/ true);
2285 return Qualifiers::GCNone;
2291 uint64_t SizeInWords;
2292 IvarInfo(CharUnits offset, uint64_t sizeInWords)
2293 : Offset(offset), SizeInWords(sizeInWords) {}
2295 // Allow sorting based on byte pos.
2296 bool operator<(const IvarInfo &other) const {
2297 return Offset < other.Offset;
2301 /// A helper class for building GC layout strings.
2302 class IvarLayoutBuilder {
2305 /// The start of the layout. Offsets will be relative to this value,
2306 /// and entries less than this value will be silently discarded.
2307 CharUnits InstanceBegin;
2309 /// The end of the layout. Offsets will never exceed this value.
2310 CharUnits InstanceEnd;
2312 /// Whether we're generating the strong layout or the weak layout.
2313 bool ForStrongLayout;
2315 /// Whether the offsets in IvarsInfo might be out-of-order.
2316 bool IsDisordered = false;
2318 llvm::SmallVector<IvarInfo, 8> IvarsInfo;
2321 IvarLayoutBuilder(CodeGenModule &CGM, CharUnits instanceBegin,
2322 CharUnits instanceEnd, bool forStrongLayout)
2323 : CGM(CGM), InstanceBegin(instanceBegin), InstanceEnd(instanceEnd),
2324 ForStrongLayout(forStrongLayout) {
2327 void visitRecord(const RecordType *RT, CharUnits offset);
2329 template <class Iterator, class GetOffsetFn>
2330 void visitAggregate(Iterator begin, Iterator end,
2331 CharUnits aggrOffset,
2332 const GetOffsetFn &getOffset);
2334 void visitField(const FieldDecl *field, CharUnits offset);
2336 /// Add the layout of a block implementation.
2337 void visitBlock(const CGBlockInfo &blockInfo);
2339 /// Is there any information for an interesting bitmap?
2340 bool hasBitmapData() const { return !IvarsInfo.empty(); }
2342 llvm::Constant *buildBitmap(CGObjCCommonMac &CGObjC,
2343 llvm::SmallVectorImpl<unsigned char> &buffer);
2345 static void dump(ArrayRef<unsigned char> buffer) {
2346 const unsigned char *s = buffer.data();
2347 for (unsigned i = 0, e = buffer.size(); i < e; i++)
2349 printf("0x0%x%s", s[i], s[i] != 0 ? ", " : "");
2351 printf("0x%x%s", s[i], s[i] != 0 ? ", " : "");
2355 } // end anonymous namespace
2357 llvm::Constant *CGObjCCommonMac::BuildGCBlockLayout(CodeGenModule &CGM,
2358 const CGBlockInfo &blockInfo) {
2360 llvm::Constant *nullPtr = llvm::Constant::getNullValue(CGM.Int8PtrTy);
2361 if (CGM.getLangOpts().getGC() == LangOptions::NonGC)
2364 IvarLayoutBuilder builder(CGM, CharUnits::Zero(), blockInfo.BlockSize,
2365 /*for strong layout*/ true);
2367 builder.visitBlock(blockInfo);
2369 if (!builder.hasBitmapData())
2372 llvm::SmallVector<unsigned char, 32> buffer;
2373 llvm::Constant *C = builder.buildBitmap(*this, buffer);
2374 if (CGM.getLangOpts().ObjCGCBitmapPrint && !buffer.empty()) {
2375 printf("\n block variable layout for block: ");
2376 builder.dump(buffer);
2382 void IvarLayoutBuilder::visitBlock(const CGBlockInfo &blockInfo) {
2383 // __isa is the first field in block descriptor and must assume by runtime's
2384 // convention that it is GC'able.
2385 IvarsInfo.push_back(IvarInfo(CharUnits::Zero(), 1));
2387 const BlockDecl *blockDecl = blockInfo.getBlockDecl();
2389 // Ignore the optional 'this' capture: C++ objects are not assumed
2392 CharUnits lastFieldOffset;
2394 // Walk the captured variables.
2395 for (const auto &CI : blockDecl->captures()) {
2396 const VarDecl *variable = CI.getVariable();
2397 QualType type = variable->getType();
2399 const CGBlockInfo::Capture &capture = blockInfo.getCapture(variable);
2401 // Ignore constant captures.
2402 if (capture.isConstant()) continue;
2404 CharUnits fieldOffset = capture.getOffset();
2406 // Block fields are not necessarily ordered; if we detect that we're
2407 // adding them out-of-order, make sure we sort later.
2408 if (fieldOffset < lastFieldOffset)
2409 IsDisordered = true;
2410 lastFieldOffset = fieldOffset;
2412 // __block variables are passed by their descriptor address.
2414 IvarsInfo.push_back(IvarInfo(fieldOffset, /*size in words*/ 1));
2418 assert(!type->isArrayType() && "array variable should not be caught");
2419 if (const RecordType *record = type->getAs<RecordType>()) {
2420 visitRecord(record, fieldOffset);
2424 Qualifiers::GC GCAttr = GetGCAttrTypeForType(CGM.getContext(), type);
2426 if (GCAttr == Qualifiers::Strong) {
2427 assert(CGM.getContext().getTypeSize(type)
2428 == CGM.getTarget().getPointerWidth(0));
2429 IvarsInfo.push_back(IvarInfo(fieldOffset, /*size in words*/ 1));
2434 /// getBlockCaptureLifetime - This routine returns life time of the captured
2435 /// block variable for the purpose of block layout meta-data generation. FQT is
2436 /// the type of the variable captured in the block.
2437 Qualifiers::ObjCLifetime CGObjCCommonMac::getBlockCaptureLifetime(QualType FQT,
2439 // If it has an ownership qualifier, we're done.
2440 if (auto lifetime = FQT.getObjCLifetime())
2443 // If it doesn't, and this is ARC, it has no ownership.
2444 if (CGM.getLangOpts().ObjCAutoRefCount)
2445 return Qualifiers::OCL_None;
2447 // In MRC, retainable pointers are owned by non-__block variables.
2448 if (FQT->isObjCObjectPointerType() || FQT->isBlockPointerType())
2449 return ByrefLayout ? Qualifiers::OCL_ExplicitNone : Qualifiers::OCL_Strong;
2451 return Qualifiers::OCL_None;
2454 void CGObjCCommonMac::UpdateRunSkipBlockVars(bool IsByref,
2455 Qualifiers::ObjCLifetime LifeTime,
2456 CharUnits FieldOffset,
2457 CharUnits FieldSize) {
2458 // __block variables are passed by their descriptor address.
2460 RunSkipBlockVars.push_back(RUN_SKIP(BLOCK_LAYOUT_BYREF, FieldOffset,
2462 else if (LifeTime == Qualifiers::OCL_Strong)
2463 RunSkipBlockVars.push_back(RUN_SKIP(BLOCK_LAYOUT_STRONG, FieldOffset,
2465 else if (LifeTime == Qualifiers::OCL_Weak)
2466 RunSkipBlockVars.push_back(RUN_SKIP(BLOCK_LAYOUT_WEAK, FieldOffset,
2468 else if (LifeTime == Qualifiers::OCL_ExplicitNone)
2469 RunSkipBlockVars.push_back(RUN_SKIP(BLOCK_LAYOUT_UNRETAINED, FieldOffset,
2472 RunSkipBlockVars.push_back(RUN_SKIP(BLOCK_LAYOUT_NON_OBJECT_BYTES,
2477 void CGObjCCommonMac::BuildRCRecordLayout(const llvm::StructLayout *RecLayout,
2478 const RecordDecl *RD,
2479 ArrayRef<const FieldDecl*> RecFields,
2480 CharUnits BytePos, bool &HasUnion,
2482 bool IsUnion = (RD && RD->isUnion());
2483 CharUnits MaxUnionSize = CharUnits::Zero();
2484 const FieldDecl *MaxField = nullptr;
2485 const FieldDecl *LastFieldBitfieldOrUnnamed = nullptr;
2486 CharUnits MaxFieldOffset = CharUnits::Zero();
2487 CharUnits LastBitfieldOrUnnamedOffset = CharUnits::Zero();
2489 if (RecFields.empty())
2491 unsigned ByteSizeInBits = CGM.getTarget().getCharWidth();
2493 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
2494 const FieldDecl *Field = RecFields[i];
2495 // Note that 'i' here is actually the field index inside RD of Field,
2496 // although this dependency is hidden.
2497 const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
2498 CharUnits FieldOffset =
2499 CGM.getContext().toCharUnitsFromBits(RL.getFieldOffset(i));
2501 // Skip over unnamed or bitfields
2502 if (!Field->getIdentifier() || Field->isBitField()) {
2503 LastFieldBitfieldOrUnnamed = Field;
2504 LastBitfieldOrUnnamedOffset = FieldOffset;
2508 LastFieldBitfieldOrUnnamed = nullptr;
2509 QualType FQT = Field->getType();
2510 if (FQT->isRecordType() || FQT->isUnionType()) {
2511 if (FQT->isUnionType())
2514 BuildRCBlockVarRecordLayout(FQT->getAs<RecordType>(),
2515 BytePos + FieldOffset, HasUnion);
2519 if (const ArrayType *Array = CGM.getContext().getAsArrayType(FQT)) {
2520 const ConstantArrayType *CArray =
2521 dyn_cast_or_null<ConstantArrayType>(Array);
2522 uint64_t ElCount = CArray->getSize().getZExtValue();
2523 assert(CArray && "only array with known element size is supported");
2524 FQT = CArray->getElementType();
2525 while (const ArrayType *Array = CGM.getContext().getAsArrayType(FQT)) {
2526 const ConstantArrayType *CArray =
2527 dyn_cast_or_null<ConstantArrayType>(Array);
2528 ElCount *= CArray->getSize().getZExtValue();
2529 FQT = CArray->getElementType();
2531 if (FQT->isRecordType() && ElCount) {
2532 int OldIndex = RunSkipBlockVars.size() - 1;
2533 const RecordType *RT = FQT->getAs<RecordType>();
2534 BuildRCBlockVarRecordLayout(RT, BytePos + FieldOffset,
2537 // Replicate layout information for each array element. Note that
2538 // one element is already done.
2540 for (int FirstIndex = RunSkipBlockVars.size() - 1 ;ElIx < ElCount; ElIx++) {
2541 CharUnits Size = CGM.getContext().getTypeSizeInChars(RT);
2542 for (int i = OldIndex+1; i <= FirstIndex; ++i)
2543 RunSkipBlockVars.push_back(
2544 RUN_SKIP(RunSkipBlockVars[i].opcode,
2545 RunSkipBlockVars[i].block_var_bytepos + Size*ElIx,
2546 RunSkipBlockVars[i].block_var_size));
2551 CharUnits FieldSize = CGM.getContext().getTypeSizeInChars(Field->getType());
2553 CharUnits UnionIvarSize = FieldSize;
2554 if (UnionIvarSize > MaxUnionSize) {
2555 MaxUnionSize = UnionIvarSize;
2557 MaxFieldOffset = FieldOffset;
2560 UpdateRunSkipBlockVars(false,
2561 getBlockCaptureLifetime(FQT, ByrefLayout),
2562 BytePos + FieldOffset,
2567 if (LastFieldBitfieldOrUnnamed) {
2568 if (LastFieldBitfieldOrUnnamed->isBitField()) {
2569 // Last field was a bitfield. Must update the info.
2570 uint64_t BitFieldSize
2571 = LastFieldBitfieldOrUnnamed->getBitWidthValue(CGM.getContext());
2572 unsigned UnsSize = (BitFieldSize / ByteSizeInBits) +
2573 ((BitFieldSize % ByteSizeInBits) != 0);
2574 CharUnits Size = CharUnits::fromQuantity(UnsSize);
2575 Size += LastBitfieldOrUnnamedOffset;
2576 UpdateRunSkipBlockVars(false,
2577 getBlockCaptureLifetime(LastFieldBitfieldOrUnnamed->getType(),
2579 BytePos + LastBitfieldOrUnnamedOffset,
2582 assert(!LastFieldBitfieldOrUnnamed->getIdentifier() &&"Expected unnamed");
2583 // Last field was unnamed. Must update skip info.
2585 = CGM.getContext().getTypeSizeInChars(LastFieldBitfieldOrUnnamed->getType());
2586 UpdateRunSkipBlockVars(false,
2587 getBlockCaptureLifetime(LastFieldBitfieldOrUnnamed->getType(),
2589 BytePos + LastBitfieldOrUnnamedOffset,
2595 UpdateRunSkipBlockVars(false,
2596 getBlockCaptureLifetime(MaxField->getType(), ByrefLayout),
2597 BytePos + MaxFieldOffset,
2601 void CGObjCCommonMac::BuildRCBlockVarRecordLayout(const RecordType *RT,
2605 const RecordDecl *RD = RT->getDecl();
2606 SmallVector<const FieldDecl*, 16> Fields(RD->fields());
2607 llvm::Type *Ty = CGM.getTypes().ConvertType(QualType(RT, 0));
2608 const llvm::StructLayout *RecLayout =
2609 CGM.getDataLayout().getStructLayout(cast<llvm::StructType>(Ty));
2611 BuildRCRecordLayout(RecLayout, RD, Fields, BytePos, HasUnion, ByrefLayout);
2614 /// InlineLayoutInstruction - This routine produce an inline instruction for the
2615 /// block variable layout if it can. If not, it returns 0. Rules are as follow:
2616 /// If ((uintptr_t) layout) < (1 << 12), the layout is inline. In the 64bit world,
2617 /// an inline layout of value 0x0000000000000xyz is interpreted as follows:
2618 /// x captured object pointers of BLOCK_LAYOUT_STRONG. Followed by
2619 /// y captured object of BLOCK_LAYOUT_BYREF. Followed by
2620 /// z captured object of BLOCK_LAYOUT_WEAK. If any of the above is missing, zero
2621 /// replaces it. For example, 0x00000x00 means x BLOCK_LAYOUT_STRONG and no
2622 /// BLOCK_LAYOUT_BYREF and no BLOCK_LAYOUT_WEAK objects are captured.
2623 uint64_t CGObjCCommonMac::InlineLayoutInstruction(
2624 SmallVectorImpl<unsigned char> &Layout) {
2625 uint64_t Result = 0;
2626 if (Layout.size() <= 3) {
2627 unsigned size = Layout.size();
2628 unsigned strong_word_count = 0, byref_word_count=0, weak_word_count=0;
2630 enum BLOCK_LAYOUT_OPCODE opcode ;
2634 opcode = (enum BLOCK_LAYOUT_OPCODE) (inst >> 4);
2635 if (opcode == BLOCK_LAYOUT_STRONG)
2636 strong_word_count = (inst & 0xF)+1;
2640 opcode = (enum BLOCK_LAYOUT_OPCODE) (inst >> 4);
2641 if (opcode == BLOCK_LAYOUT_BYREF)
2642 byref_word_count = (inst & 0xF)+1;
2646 opcode = (enum BLOCK_LAYOUT_OPCODE) (inst >> 4);
2647 if (opcode == BLOCK_LAYOUT_WEAK)
2648 weak_word_count = (inst & 0xF)+1;
2655 opcode = (enum BLOCK_LAYOUT_OPCODE) (inst >> 4);
2656 if (opcode == BLOCK_LAYOUT_STRONG) {
2657 strong_word_count = (inst & 0xF)+1;
2659 opcode = (enum BLOCK_LAYOUT_OPCODE) (inst >> 4);
2660 if (opcode == BLOCK_LAYOUT_BYREF)
2661 byref_word_count = (inst & 0xF)+1;
2662 else if (opcode == BLOCK_LAYOUT_WEAK)
2663 weak_word_count = (inst & 0xF)+1;
2667 else if (opcode == BLOCK_LAYOUT_BYREF) {
2668 byref_word_count = (inst & 0xF)+1;
2670 opcode = (enum BLOCK_LAYOUT_OPCODE) (inst >> 4);
2671 if (opcode == BLOCK_LAYOUT_WEAK)
2672 weak_word_count = (inst & 0xF)+1;
2682 opcode = (enum BLOCK_LAYOUT_OPCODE) (inst >> 4);
2683 if (opcode == BLOCK_LAYOUT_STRONG)
2684 strong_word_count = (inst & 0xF)+1;
2685 else if (opcode == BLOCK_LAYOUT_BYREF)
2686 byref_word_count = (inst & 0xF)+1;
2687 else if (opcode == BLOCK_LAYOUT_WEAK)
2688 weak_word_count = (inst & 0xF)+1;
2697 // Cannot inline when any of the word counts is 15. Because this is one less
2698 // than the actual work count (so 15 means 16 actual word counts),
2699 // and we can only display 0 thru 15 word counts.
2700 if (strong_word_count == 16 || byref_word_count == 16 || weak_word_count == 16)
2704 (strong_word_count != 0) + (byref_word_count != 0) + (weak_word_count != 0);
2706 if (size == count) {
2707 if (strong_word_count)
2708 Result = strong_word_count;
2710 if (byref_word_count)
2711 Result += byref_word_count;
2713 if (weak_word_count)
2714 Result += weak_word_count;
2720 llvm::Constant *CGObjCCommonMac::getBitmapBlockLayout(bool ComputeByrefLayout) {
2721 llvm::Constant *nullPtr = llvm::Constant::getNullValue(CGM.Int8PtrTy);
2722 if (RunSkipBlockVars.empty())
2724 unsigned WordSizeInBits = CGM.getTarget().getPointerWidth(0);
2725 unsigned ByteSizeInBits = CGM.getTarget().getCharWidth();
2726 unsigned WordSizeInBytes = WordSizeInBits/ByteSizeInBits;
2728 // Sort on byte position; captures might not be allocated in order,
2729 // and unions can do funny things.
2730 llvm::array_pod_sort(RunSkipBlockVars.begin(), RunSkipBlockVars.end());
2731 SmallVector<unsigned char, 16> Layout;
2733 unsigned size = RunSkipBlockVars.size();
2734 for (unsigned i = 0; i < size; i++) {
2735 enum BLOCK_LAYOUT_OPCODE opcode = RunSkipBlockVars[i].opcode;
2736 CharUnits start_byte_pos = RunSkipBlockVars[i].block_var_bytepos;
2737 CharUnits end_byte_pos = start_byte_pos;
2740 if (opcode == RunSkipBlockVars[j].opcode) {
2741 end_byte_pos = RunSkipBlockVars[j++].block_var_bytepos;
2747 CharUnits size_in_bytes =
2748 end_byte_pos - start_byte_pos + RunSkipBlockVars[j-1].block_var_size;
2751 RunSkipBlockVars[j].block_var_bytepos -
2752 RunSkipBlockVars[j-1].block_var_bytepos - RunSkipBlockVars[j-1].block_var_size;
2753 size_in_bytes += gap;
2755 CharUnits residue_in_bytes = CharUnits::Zero();
2756 if (opcode == BLOCK_LAYOUT_NON_OBJECT_BYTES) {
2757 residue_in_bytes = size_in_bytes % WordSizeInBytes;
2758 size_in_bytes -= residue_in_bytes;
2759 opcode = BLOCK_LAYOUT_NON_OBJECT_WORDS;
2762 unsigned size_in_words = size_in_bytes.getQuantity() / WordSizeInBytes;
2763 while (size_in_words >= 16) {
2764 // Note that value in imm. is one less that the actual
2765 // value. So, 0xf means 16 words follow!
2766 unsigned char inst = (opcode << 4) | 0xf;
2767 Layout.push_back(inst);
2768 size_in_words -= 16;
2770 if (size_in_words > 0) {
2771 // Note that value in imm. is one less that the actual
2772 // value. So, we subtract 1 away!
2773 unsigned char inst = (opcode << 4) | (size_in_words-1);
2774 Layout.push_back(inst);
2776 if (residue_in_bytes > CharUnits::Zero()) {
2777 unsigned char inst =
2778 (BLOCK_LAYOUT_NON_OBJECT_BYTES << 4) | (residue_in_bytes.getQuantity()-1);
2779 Layout.push_back(inst);
2783 while (!Layout.empty()) {
2784 unsigned char inst = Layout.back();
2785 enum BLOCK_LAYOUT_OPCODE opcode = (enum BLOCK_LAYOUT_OPCODE) (inst >> 4);
2786 if (opcode == BLOCK_LAYOUT_NON_OBJECT_BYTES || opcode == BLOCK_LAYOUT_NON_OBJECT_WORDS)
2792 uint64_t Result = InlineLayoutInstruction(Layout);
2794 // Block variable layout instruction has been inlined.
2795 if (CGM.getLangOpts().ObjCGCBitmapPrint) {
2796 if (ComputeByrefLayout)
2797 printf("\n Inline BYREF variable layout: ");
2799 printf("\n Inline block variable layout: ");
2800 printf("0x0%" PRIx64 "", Result);
2801 if (auto numStrong = (Result & 0xF00) >> 8)
2802 printf(", BL_STRONG:%d", (int) numStrong);
2803 if (auto numByref = (Result & 0x0F0) >> 4)
2804 printf(", BL_BYREF:%d", (int) numByref);
2805 if (auto numWeak = (Result & 0x00F) >> 0)
2806 printf(", BL_WEAK:%d", (int) numWeak);
2807 printf(", BL_OPERATOR:0\n");
2809 return llvm::ConstantInt::get(CGM.IntPtrTy, Result);
2812 unsigned char inst = (BLOCK_LAYOUT_OPERATOR << 4) | 0;
2813 Layout.push_back(inst);
2815 for (unsigned i = 0, e = Layout.size(); i != e; i++)
2816 BitMap += Layout[i];
2818 if (CGM.getLangOpts().ObjCGCBitmapPrint) {
2819 if (ComputeByrefLayout)
2820 printf("\n Byref variable layout: ");
2822 printf("\n Block variable layout: ");
2823 for (unsigned i = 0, e = BitMap.size(); i != e; i++) {
2824 unsigned char inst = BitMap[i];
2825 enum BLOCK_LAYOUT_OPCODE opcode = (enum BLOCK_LAYOUT_OPCODE) (inst >> 4);
2828 case BLOCK_LAYOUT_OPERATOR:
2829 printf("BL_OPERATOR:");
2832 case BLOCK_LAYOUT_NON_OBJECT_BYTES:
2833 printf("BL_NON_OBJECT_BYTES:");
2835 case BLOCK_LAYOUT_NON_OBJECT_WORDS:
2836 printf("BL_NON_OBJECT_WORD:");
2838 case BLOCK_LAYOUT_STRONG:
2839 printf("BL_STRONG:");
2841 case BLOCK_LAYOUT_BYREF:
2842 printf("BL_BYREF:");
2844 case BLOCK_LAYOUT_WEAK:
2847 case BLOCK_LAYOUT_UNRETAINED:
2848 printf("BL_UNRETAINED:");
2851 // Actual value of word count is one more that what is in the imm.
2852 // field of the instruction
2853 printf("%d", (inst & 0xf) + delta);
2861 auto *Entry = CreateCStringLiteral(BitMap, ObjCLabelType::ClassName,
2862 /*ForceNonFragileABI=*/true,
2863 /*NullTerminate=*/false);
2864 return getConstantGEP(VMContext, Entry, 0, 0);
2867 static std::string getBlockLayoutInfoString(
2868 const SmallVectorImpl<CGObjCCommonMac::RUN_SKIP> &RunSkipBlockVars,
2869 bool HasCopyDisposeHelpers) {
2871 for (const CGObjCCommonMac::RUN_SKIP &R : RunSkipBlockVars) {
2872 if (R.opcode == CGObjCCommonMac::BLOCK_LAYOUT_UNRETAINED) {
2873 // Copy/dispose helpers don't have any information about
2874 // __unsafe_unretained captures, so unconditionally concatenate a string.
2876 } else if (HasCopyDisposeHelpers) {
2877 // Information about __strong, __weak, or byref captures has already been
2878 // encoded into the names of the copy/dispose helpers. We have to add a
2879 // string here only when the copy/dispose helpers aren't generated (which
2880 // happens when the block is non-escaping).
2884 case CGObjCCommonMac::BLOCK_LAYOUT_STRONG:
2887 case CGObjCCommonMac::BLOCK_LAYOUT_BYREF:
2890 case CGObjCCommonMac::BLOCK_LAYOUT_WEAK:
2897 Str += llvm::to_string(R.block_var_bytepos.getQuantity());
2898 Str += "l" + llvm::to_string(R.block_var_size.getQuantity());
2903 void CGObjCCommonMac::fillRunSkipBlockVars(CodeGenModule &CGM,
2904 const CGBlockInfo &blockInfo) {
2905 assert(CGM.getLangOpts().getGC() == LangOptions::NonGC);
2907 RunSkipBlockVars.clear();
2908 bool hasUnion = false;
2910 unsigned WordSizeInBits = CGM.getTarget().getPointerWidth(0);
2911 unsigned ByteSizeInBits = CGM.getTarget().getCharWidth();
2912 unsigned WordSizeInBytes = WordSizeInBits/ByteSizeInBits;
2914 const BlockDecl *blockDecl = blockInfo.getBlockDecl();
2916 // Calculate the basic layout of the block structure.
2917 const llvm::StructLayout *layout =
2918 CGM.getDataLayout().getStructLayout(blockInfo.StructureType);
2920 // Ignore the optional 'this' capture: C++ objects are not assumed
2922 if (blockInfo.BlockHeaderForcedGapSize != CharUnits::Zero())
2923 UpdateRunSkipBlockVars(false, Qualifiers::OCL_None,
2924 blockInfo.BlockHeaderForcedGapOffset,
2925 blockInfo.BlockHeaderForcedGapSize);
2926 // Walk the captured variables.
2927 for (const auto &CI : blockDecl->captures()) {
2928 const VarDecl *variable = CI.getVariable();
2929 QualType type = variable->getType();
2931 const CGBlockInfo::Capture &capture = blockInfo.getCapture(variable);
2933 // Ignore constant captures.
2934 if (capture.isConstant()) continue;
2936 CharUnits fieldOffset =
2937 CharUnits::fromQuantity(layout->getElementOffset(capture.getIndex()));
2939 assert(!type->isArrayType() && "array variable should not be caught");
2941 if (const RecordType *record = type->getAs<RecordType>()) {
2942 BuildRCBlockVarRecordLayout(record, fieldOffset, hasUnion);
2945 CharUnits fieldSize;
2947 fieldSize = CharUnits::fromQuantity(WordSizeInBytes);
2949 fieldSize = CGM.getContext().getTypeSizeInChars(type);
2950 UpdateRunSkipBlockVars(CI.isByRef(), getBlockCaptureLifetime(type, false),
2951 fieldOffset, fieldSize);
2956 CGObjCCommonMac::BuildRCBlockLayout(CodeGenModule &CGM,
2957 const CGBlockInfo &blockInfo) {
2958 fillRunSkipBlockVars(CGM, blockInfo);
2959 return getBitmapBlockLayout(false);
2962 std::string CGObjCCommonMac::getRCBlockLayoutStr(CodeGenModule &CGM,
2963 const CGBlockInfo &blockInfo) {
2964 fillRunSkipBlockVars(CGM, blockInfo);
2965 return getBlockLayoutInfoString(RunSkipBlockVars,
2966 blockInfo.needsCopyDisposeHelpers());
2969 llvm::Constant *CGObjCCommonMac::BuildByrefLayout(CodeGen::CodeGenModule &CGM,
2971 assert(CGM.getLangOpts().getGC() == LangOptions::NonGC);
2972 assert(!T->isArrayType() && "__block array variable should not be caught");
2973 CharUnits fieldOffset;
2974 RunSkipBlockVars.clear();
2975 bool hasUnion = false;
2976 if (const RecordType *record = T->getAs<RecordType>()) {
2977 BuildRCBlockVarRecordLayout(record, fieldOffset, hasUnion, true /*ByrefLayout */);
2978 llvm::Constant *Result = getBitmapBlockLayout(true);
2979 if (isa<llvm::ConstantInt>(Result))
2980 Result = llvm::ConstantExpr::getIntToPtr(Result, CGM.Int8PtrTy);
2983 llvm::Constant *nullPtr = llvm::Constant::getNullValue(CGM.Int8PtrTy);
2987 llvm::Value *CGObjCMac::GenerateProtocolRef(CodeGenFunction &CGF,
2988 const ObjCProtocolDecl *PD) {
2989 // FIXME: I don't understand why gcc generates this, or where it is
2990 // resolved. Investigate. Its also wasteful to look this up over and over.
2991 LazySymbols.insert(&CGM.getContext().Idents.get("Protocol"));
2993 return llvm::ConstantExpr::getBitCast(GetProtocolRef(PD),
2994 ObjCTypes.getExternalProtocolPtrTy());
2997 void CGObjCCommonMac::GenerateProtocol(const ObjCProtocolDecl *PD) {
2998 // FIXME: We shouldn't need this, the protocol decl should contain enough
2999 // information to tell us whether this was a declaration or a definition.
3000 DefinedProtocols.insert(PD->getIdentifier());
3002 // If we have generated a forward reference to this protocol, emit
3003 // it now. Otherwise do nothing, the protocol objects are lazily
3005 if (Protocols.count(PD->getIdentifier()))
3006 GetOrEmitProtocol(PD);
3009 llvm::Constant *CGObjCCommonMac::GetProtocolRef(const ObjCProtocolDecl *PD) {
3010 if (DefinedProtocols.count(PD->getIdentifier()))
3011 return GetOrEmitProtocol(PD);
3013 return GetOrEmitProtocolRef(PD);
3016 llvm::Value *CGObjCCommonMac::EmitClassRefViaRuntime(
3017 CodeGenFunction &CGF,
3018 const ObjCInterfaceDecl *ID,
3019 ObjCCommonTypesHelper &ObjCTypes) {
3020 llvm::FunctionCallee lookUpClassFn = ObjCTypes.getLookUpClassFn();
3022 llvm::Value *className =
3023 CGF.CGM.GetAddrOfConstantCString(ID->getObjCRuntimeNameAsString())
3025 ASTContext &ctx = CGF.CGM.getContext();
3027 CGF.Builder.CreateBitCast(className,
3029 ctx.getPointerType(ctx.CharTy.withConst())));
3030 llvm::CallInst *call = CGF.Builder.CreateCall(lookUpClassFn, className);
3031 call->setDoesNotThrow();
3036 // Objective-C 1.0 extensions
3037 struct _objc_protocol {
3038 struct _objc_protocol_extension *isa;
3039 char *protocol_name;
3040 struct _objc_protocol_list *protocol_list;
3041 struct _objc__method_prototype_list *instance_methods;
3042 struct _objc__method_prototype_list *class_methods
3045 See EmitProtocolExtension().
3047 llvm::Constant *CGObjCMac::GetOrEmitProtocol(const ObjCProtocolDecl *PD) {
3048 llvm::GlobalVariable *Entry = Protocols[PD->getIdentifier()];
3050 // Early exit if a defining object has already been generated.
3051 if (Entry && Entry->hasInitializer())
3054 // Use the protocol definition, if there is one.
3055 if (const ObjCProtocolDecl *Def = PD->getDefinition())
3058 // FIXME: I don't understand why gcc generates this, or where it is
3059 // resolved. Investigate. Its also wasteful to look this up over and over.
3060 LazySymbols.insert(&CGM.getContext().Idents.get("Protocol"));
3062 // Construct method lists.
3063 auto methodLists = ProtocolMethodLists::get(PD);
3065 ConstantInitBuilder builder(CGM);
3066 auto values = builder.beginStruct(ObjCTypes.ProtocolTy);
3067 values.add(EmitProtocolExtension(PD, methodLists));
3068 values.add(GetClassName(PD->getObjCRuntimeNameAsString()));
3069 values.add(EmitProtocolList("OBJC_PROTOCOL_REFS_" + PD->getName(),
3070 PD->protocol_begin(), PD->protocol_end()));
3071 values.add(methodLists.emitMethodList(this, PD,
3072 ProtocolMethodLists::RequiredInstanceMethods));
3073 values.add(methodLists.emitMethodList(this, PD,
3074 ProtocolMethodLists::RequiredClassMethods));
3077 // Already created, update the initializer.
3078 assert(Entry->hasPrivateLinkage());
3079 values.finishAndSetAsInitializer(Entry);
3081 Entry = values.finishAndCreateGlobal("OBJC_PROTOCOL_" + PD->getName(),
3082 CGM.getPointerAlign(),
3084 llvm::GlobalValue::PrivateLinkage);
3085 Entry->setSection("__OBJC,__protocol,regular,no_dead_strip");
3087 Protocols[PD->getIdentifier()] = Entry;
3089 CGM.addCompilerUsedGlobal(Entry);
3094 llvm::Constant *CGObjCMac::GetOrEmitProtocolRef(const ObjCProtocolDecl *PD) {
3095 llvm::GlobalVariable *&Entry = Protocols[PD->getIdentifier()];
3098 // We use the initializer as a marker of whether this is a forward
3099 // reference or not. At module finalization we add the empty
3100 // contents for protocols which were referenced but never defined.
3101 Entry = new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.ProtocolTy,
3102 false, llvm::GlobalValue::PrivateLinkage,
3103 nullptr, "OBJC_PROTOCOL_" + PD->getName());
3104 Entry->setSection("__OBJC,__protocol,regular,no_dead_strip");
3105 // FIXME: Is this necessary? Why only for protocol?
3106 Entry->setAlignment(4);
3113 struct _objc_protocol_extension {
3115 struct objc_method_description_list *optional_instance_methods;
3116 struct objc_method_description_list *optional_class_methods;
3117 struct objc_property_list *instance_properties;
3118 const char ** extendedMethodTypes;
3119 struct objc_property_list *class_properties;
3123 CGObjCMac::EmitProtocolExtension(const ObjCProtocolDecl *PD,
3124 const ProtocolMethodLists &methodLists) {
3125 auto optInstanceMethods =
3126 methodLists.emitMethodList(this, PD,
3127 ProtocolMethodLists::OptionalInstanceMethods);
3128 auto optClassMethods =
3129 methodLists.emitMethodList(this, PD,
3130 ProtocolMethodLists::OptionalClassMethods);
3132 auto extendedMethodTypes =
3133 EmitProtocolMethodTypes("OBJC_PROTOCOL_METHOD_TYPES_" + PD->getName(),
3134 methodLists.emitExtendedTypesArray(this),
3137 auto instanceProperties =
3138 EmitPropertyList("OBJC_$_PROP_PROTO_LIST_" + PD->getName(), nullptr, PD,
3140 auto classProperties =
3141 EmitPropertyList("OBJC_$_CLASS_PROP_PROTO_LIST_" + PD->getName(), nullptr,
3142 PD, ObjCTypes, true);
3144 // Return null if no extension bits are used.
3145 if (optInstanceMethods->isNullValue() &&
3146 optClassMethods->isNullValue() &&
3147 extendedMethodTypes->isNullValue() &&
3148 instanceProperties->isNullValue() &&
3149 classProperties->isNullValue()) {
3150 return llvm::Constant::getNullValue(ObjCTypes.ProtocolExtensionPtrTy);
3154 CGM.getDataLayout().getTypeAllocSize(ObjCTypes.ProtocolExtensionTy);
3156 ConstantInitBuilder builder(CGM);
3157 auto values = builder.beginStruct(ObjCTypes.ProtocolExtensionTy);
3158 values.addInt(ObjCTypes.IntTy, size);
3159 values.add(optInstanceMethods);
3160 values.add(optClassMethods);
3161 values.add(instanceProperties);
3162 values.add(extendedMethodTypes);
3163 values.add(classProperties);
3165 // No special section, but goes in llvm.used
3166 return CreateMetadataVar("_OBJC_PROTOCOLEXT_" + PD->getName(), values,
3167 StringRef(), CGM.getPointerAlign(), true);
3171 struct objc_protocol_list {
3172 struct objc_protocol_list *next;
3178 CGObjCMac::EmitProtocolList(Twine name,
3179 ObjCProtocolDecl::protocol_iterator begin,
3180 ObjCProtocolDecl::protocol_iterator end) {
3181 // Just return null for empty protocol lists
3183 return llvm::Constant::getNullValue(ObjCTypes.ProtocolListPtrTy);
3185 ConstantInitBuilder builder(CGM);
3186 auto values = builder.beginStruct();
3188 // This field is only used by the runtime.
3189 values.addNullPointer(ObjCTypes.ProtocolListPtrTy);
3191 // Reserve a slot for the count.
3192 auto countSlot = values.addPlaceholder();
3194 auto refsArray = values.beginArray(ObjCTypes.ProtocolPtrTy);
3195 for (; begin != end; ++begin) {
3196 refsArray.add(GetProtocolRef(*begin));
3198 auto count = refsArray.size();
3200 // This list is null terminated.
3201 refsArray.addNullPointer(ObjCTypes.ProtocolPtrTy);
3203 refsArray.finishAndAddTo(values);
3204 values.fillPlaceholderWithInt(countSlot, ObjCTypes.LongTy, count);
3207 if (CGM.getTriple().isOSBinFormatMachO())
3208 section = "__OBJC,__cat_cls_meth,regular,no_dead_strip";
3210 llvm::GlobalVariable *GV =
3211 CreateMetadataVar(name, values, section, CGM.getPointerAlign(), false);
3212 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.ProtocolListPtrTy);
3216 PushProtocolProperties(llvm::SmallPtrSet<const IdentifierInfo*,16> &PropertySet,
3217 SmallVectorImpl<const ObjCPropertyDecl *> &Properties,
3218 const ObjCProtocolDecl *Proto,
3219 bool IsClassProperty) {
3220 for (const auto *P : Proto->protocols())
3221 PushProtocolProperties(PropertySet, Properties, P, IsClassProperty);
3223 for (const auto *PD : Proto->properties()) {
3224 if (IsClassProperty != PD->isClassProperty())
3226 if (!PropertySet.insert(PD->getIdentifier()).second)
3228 Properties.push_back(PD);
3233 struct _objc_property {
3234 const char * const name;
3235 const char * const attributes;
3238 struct _objc_property_list {
3239 uint32_t entsize; // sizeof (struct _objc_property)
3240 uint32_t prop_count;
3241 struct _objc_property[prop_count];
3244 llvm::Constant *CGObjCCommonMac::EmitPropertyList(Twine Name,
3245 const Decl *Container,
3246 const ObjCContainerDecl *OCD,
3247 const ObjCCommonTypesHelper &ObjCTypes,
3248 bool IsClassProperty) {
3249 if (IsClassProperty) {
3250 // Make this entry NULL for OS X with deployment target < 10.11, for iOS
3251 // with deployment target < 9.0.
3252 const llvm::Triple &Triple = CGM.getTarget().getTriple();
3253 if ((Triple.isMacOSX() && Triple.isMacOSXVersionLT(10, 11)) ||
3254 (Triple.isiOS() && Triple.isOSVersionLT(9)))
3255 return llvm::Constant::getNullValue(ObjCTypes.PropertyListPtrTy);
3258 SmallVector<const ObjCPropertyDecl *, 16> Properties;
3259 llvm::SmallPtrSet<const IdentifierInfo*, 16> PropertySet;
3261 if (const ObjCInterfaceDecl *OID = dyn_cast<ObjCInterfaceDecl>(OCD))
3262 for (const ObjCCategoryDecl *ClassExt : OID->known_extensions())
3263 for (auto *PD : ClassExt->properties()) {
3264 if (IsClassProperty != PD->isClassProperty())
3266 PropertySet.insert(PD->getIdentifier());
3267 Properties.push_back(PD);
3270 for (const auto *PD : OCD->properties()) {
3271 if (IsClassProperty != PD->isClassProperty())
3273 // Don't emit duplicate metadata for properties that were already in a
3275 if (!PropertySet.insert(PD->getIdentifier()).second)
3277 Properties.push_back(PD);
3280 if (const ObjCInterfaceDecl *OID = dyn_cast<ObjCInterfaceDecl>(OCD)) {
3281 for (const auto *P : OID->all_referenced_protocols())
3282 PushProtocolProperties(PropertySet, Properties, P, IsClassProperty);
3284 else if (const ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(OCD)) {
3285 for (const auto *P : CD->protocols())
3286 PushProtocolProperties(PropertySet, Properties, P, IsClassProperty);
3289 // Return null for empty list.
3290 if (Properties.empty())
3291 return llvm::Constant::getNullValue(ObjCTypes.PropertyListPtrTy);
3293 unsigned propertySize =
3294 CGM.getDataLayout().getTypeAllocSize(ObjCTypes.PropertyTy);
3296 ConstantInitBuilder builder(CGM);
3297 auto values = builder.beginStruct();
3298 values.addInt(ObjCTypes.IntTy, propertySize);
3299 values.addInt(ObjCTypes.IntTy, Properties.size());
3300 auto propertiesArray = values.beginArray(ObjCTypes.PropertyTy);
3301 for (auto PD : Properties) {
3302 auto property = propertiesArray.beginStruct(ObjCTypes.PropertyTy);
3303 property.add(GetPropertyName(PD->getIdentifier()));
3304 property.add(GetPropertyTypeString(PD, Container));
3305 property.finishAndAddTo(propertiesArray);
3307 propertiesArray.finishAndAddTo(values);
3310 if (CGM.getTriple().isOSBinFormatMachO())
3311 Section = (ObjCABI == 2) ? "__DATA, __objc_const"
3312 : "__OBJC,__property,regular,no_dead_strip";
3314 llvm::GlobalVariable *GV =
3315 CreateMetadataVar(Name, values, Section, CGM.getPointerAlign(), true);
3316 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.PropertyListPtrTy);
3320 CGObjCCommonMac::EmitProtocolMethodTypes(Twine Name,
3321 ArrayRef<llvm::Constant*> MethodTypes,
3322 const ObjCCommonTypesHelper &ObjCTypes) {
3323 // Return null for empty list.
3324 if (MethodTypes.empty())
3325 return llvm::Constant::getNullValue(ObjCTypes.Int8PtrPtrTy);
3327 llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.Int8PtrTy,
3328 MethodTypes.size());
3329 llvm::Constant *Init = llvm::ConstantArray::get(AT, MethodTypes);
3332 if (CGM.getTriple().isOSBinFormatMachO() && ObjCABI == 2)
3333 Section = "__DATA, __objc_const";
3335 llvm::GlobalVariable *GV =
3336 CreateMetadataVar(Name, Init, Section, CGM.getPointerAlign(), true);
3337 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.Int8PtrPtrTy);
3341 struct _objc_category {
3342 char *category_name;
3344 struct _objc_method_list *instance_methods;
3345 struct _objc_method_list *class_methods;
3346 struct _objc_protocol_list *protocols;
3347 uint32_t size; // <rdar://4585769>
3348 struct _objc_property_list *instance_properties;
3349 struct _objc_property_list *class_properties;
3352 void CGObjCMac::GenerateCategory(const ObjCCategoryImplDecl *OCD) {
3353 unsigned Size = CGM.getDataLayout().getTypeAllocSize(ObjCTypes.CategoryTy);
3355 // FIXME: This is poor design, the OCD should have a pointer to the category
3356 // decl. Additionally, note that Category can be null for the @implementation
3357 // w/o an @interface case. Sema should just create one for us as it does for
3358 // @implementation so everyone else can live life under a clear blue sky.
3359 const ObjCInterfaceDecl *Interface = OCD->getClassInterface();
3360 const ObjCCategoryDecl *Category =
3361 Interface->FindCategoryDeclaration(OCD->getIdentifier());
3363 SmallString<256> ExtName;
3364 llvm::raw_svector_ostream(ExtName) << Interface->getName() << '_'
3367 ConstantInitBuilder Builder(CGM);
3368 auto Values = Builder.beginStruct(ObjCTypes.CategoryTy);
3375 SmallVector<const ObjCMethodDecl *, 16> Methods[NumMethodLists];
3376 for (const auto *MD : OCD->methods()) {
3377 Methods[unsigned(MD->isClassMethod())].push_back(MD);
3380 Values.add(GetClassName(OCD->getName()));
3381 Values.add(GetClassName(Interface->getObjCRuntimeNameAsString()));
3382 LazySymbols.insert(Interface->getIdentifier());
3384 Values.add(emitMethodList(ExtName, MethodListType::CategoryInstanceMethods,
3385 Methods[InstanceMethods]));
3386 Values.add(emitMethodList(ExtName, MethodListType::CategoryClassMethods,
3387 Methods[ClassMethods]));
3390 EmitProtocolList("OBJC_CATEGORY_PROTOCOLS_" + ExtName.str(),
3391 Category->protocol_begin(), Category->protocol_end()));
3393 Values.addNullPointer(ObjCTypes.ProtocolListPtrTy);
3395 Values.addInt(ObjCTypes.IntTy, Size);
3397 // If there is no category @interface then there can be no properties.
3399 Values.add(EmitPropertyList("_OBJC_$_PROP_LIST_" + ExtName.str(),
3400 OCD, Category, ObjCTypes, false));
3401 Values.add(EmitPropertyList("_OBJC_$_CLASS_PROP_LIST_" + ExtName.str(),
3402 OCD, Category, ObjCTypes, true));
3404 Values.addNullPointer(ObjCTypes.PropertyListPtrTy);
3405 Values.addNullPointer(ObjCTypes.PropertyListPtrTy);
3408 llvm::GlobalVariable *GV =
3409 CreateMetadataVar("OBJC_CATEGORY_" + ExtName.str(), Values,
3410 "__OBJC,__category,regular,no_dead_strip",
3411 CGM.getPointerAlign(), true);
3412 DefinedCategories.push_back(GV);
3413 DefinedCategoryNames.insert(llvm::CachedHashString(ExtName));
3414 // method definition entries must be clear for next implementation.
3415 MethodDefinitions.clear();
3418 enum FragileClassFlags {
3419 /// Apparently: is not a meta-class.
3420 FragileABI_Class_Factory = 0x00001,
3422 /// Is a meta-class.
3423 FragileABI_Class_Meta = 0x00002,
3425 /// Has a non-trivial constructor or destructor.
3426 FragileABI_Class_HasCXXStructors = 0x02000,
3428 /// Has hidden visibility.
3429 FragileABI_Class_Hidden = 0x20000,
3431 /// Class implementation was compiled under ARC.
3432 FragileABI_Class_CompiledByARC = 0x04000000,
3434 /// Class implementation was compiled under MRC and has MRC weak ivars.
3435 /// Exclusive with CompiledByARC.
3436 FragileABI_Class_HasMRCWeakIvars = 0x08000000,
3439 enum NonFragileClassFlags {
3440 /// Is a meta-class.
3441 NonFragileABI_Class_Meta = 0x00001,
3443 /// Is a root class.
3444 NonFragileABI_Class_Root = 0x00002,
3446 /// Has a non-trivial constructor or destructor.
3447 NonFragileABI_Class_HasCXXStructors = 0x00004,
3449 /// Has hidden visibility.
3450 NonFragileABI_Class_Hidden = 0x00010,
3452 /// Has the exception attribute.
3453 NonFragileABI_Class_Exception = 0x00020,
3455 /// (Obsolete) ARC-specific: this class has a .release_ivars method
3456 NonFragileABI_Class_HasIvarReleaser = 0x00040,
3458 /// Class implementation was compiled under ARC.
3459 NonFragileABI_Class_CompiledByARC = 0x00080,
3461 /// Class has non-trivial destructors, but zero-initialization is okay.
3462 NonFragileABI_Class_HasCXXDestructorOnly = 0x00100,
3464 /// Class implementation was compiled under MRC and has MRC weak ivars.
3465 /// Exclusive with CompiledByARC.
3466 NonFragileABI_Class_HasMRCWeakIvars = 0x00200,
3469 static bool hasWeakMember(QualType type) {
3470 if (type.getObjCLifetime() == Qualifiers::OCL_Weak) {
3474 if (auto recType = type->getAs<RecordType>()) {
3475 for (auto field : recType->getDecl()->fields()) {
3476 if (hasWeakMember(field->getType()))
3484 /// For compatibility, we only want to set the "HasMRCWeakIvars" flag
3485 /// (and actually fill in a layout string) if we really do have any
3487 static bool hasMRCWeakIvars(CodeGenModule &CGM,
3488 const ObjCImplementationDecl *ID) {
3489 if (!CGM.getLangOpts().ObjCWeak) return false;
3490 assert(CGM.getLangOpts().getGC() == LangOptions::NonGC);
3492 for (const ObjCIvarDecl *ivar =
3493 ID->getClassInterface()->all_declared_ivar_begin();
3494 ivar; ivar = ivar->getNextIvar()) {
3495 if (hasWeakMember(ivar->getType()))
3503 struct _objc_class {
3510 struct _objc_ivar_list *ivars;
3511 struct _objc_method_list *methods;
3512 struct _objc_cache *cache;
3513 struct _objc_protocol_list *protocols;
3514 // Objective-C 1.0 extensions (<rdr://4585769>)
3515 const char *ivar_layout;
3516 struct _objc_class_ext *ext;
3519 See EmitClassExtension();
3521 void CGObjCMac::GenerateClass(const ObjCImplementationDecl *ID) {
3522 IdentifierInfo *RuntimeName =
3523 &CGM.getContext().Idents.get(ID->getObjCRuntimeNameAsString());
3524 DefinedSymbols.insert(RuntimeName);
3526 std::string ClassName = ID->getNameAsString();
3528 ObjCInterfaceDecl *Interface =
3529 const_cast<ObjCInterfaceDecl*>(ID->getClassInterface());
3530 llvm::Constant *Protocols =
3531 EmitProtocolList("OBJC_CLASS_PROTOCOLS_" + ID->getName(),
3532 Interface->all_referenced_protocol_begin(),
3533 Interface->all_referenced_protocol_end());
3534 unsigned Flags = FragileABI_Class_Factory;
3535 if (ID->hasNonZeroConstructors() || ID->hasDestructors())
3536 Flags |= FragileABI_Class_HasCXXStructors;
3538 bool hasMRCWeak = false;
3540 if (CGM.getLangOpts().ObjCAutoRefCount)
3541 Flags |= FragileABI_Class_CompiledByARC;
3542 else if ((hasMRCWeak = hasMRCWeakIvars(CGM, ID)))
3543 Flags |= FragileABI_Class_HasMRCWeakIvars;
3546 CGM.getContext().getASTObjCImplementationLayout(ID).getSize();
3548 // FIXME: Set CXX-structors flag.
3549 if (ID->getClassInterface()->getVisibility() == HiddenVisibility)
3550 Flags |= FragileABI_Class_Hidden;
3557 SmallVector<const ObjCMethodDecl *, 16> Methods[NumMethodLists];
3558 for (const auto *MD : ID->methods()) {
3559 Methods[unsigned(MD->isClassMethod())].push_back(MD);
3562 for (const auto *PID : ID->property_impls()) {
3563 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) {
3564 ObjCPropertyDecl *PD = PID->getPropertyDecl();
3566 if (ObjCMethodDecl *MD = PD->getGetterMethodDecl())
3567 if (GetMethodDefinition(MD))
3568 Methods[InstanceMethods].push_back(MD);
3569 if (ObjCMethodDecl *MD = PD->getSetterMethodDecl())
3570 if (GetMethodDefinition(MD))
3571 Methods[InstanceMethods].push_back(MD);
3575 ConstantInitBuilder builder(CGM);
3576 auto values = builder.beginStruct(ObjCTypes.ClassTy);
3577 values.add(EmitMetaClass(ID, Protocols, Methods[ClassMethods]));
3578 if (ObjCInterfaceDecl *Super = Interface->getSuperClass()) {
3579 // Record a reference to the super class.
3580 LazySymbols.insert(Super->getIdentifier());
3582 values.addBitCast(GetClassName(Super->getObjCRuntimeNameAsString()),
3583 ObjCTypes.ClassPtrTy);
3585 values.addNullPointer(ObjCTypes.ClassPtrTy);
3587 values.add(GetClassName(ID->getObjCRuntimeNameAsString()));
3588 // Version is always 0.
3589 values.addInt(ObjCTypes.LongTy, 0);
3590 values.addInt(ObjCTypes.LongTy, Flags);
3591 values.addInt(ObjCTypes.LongTy, Size.getQuantity());
3592 values.add(EmitIvarList(ID, false));
3593 values.add(emitMethodList(ID->getName(), MethodListType::InstanceMethods,
3594 Methods[InstanceMethods]));
3595 // cache is always NULL.
3596 values.addNullPointer(ObjCTypes.CachePtrTy);
3597 values.add(Protocols);
3598 values.add(BuildStrongIvarLayout(ID, CharUnits::Zero(), Size));
3599 values.add(EmitClassExtension(ID, Size, hasMRCWeak,
3600 /*isMetaclass*/ false));
3602 std::string Name("OBJC_CLASS_");
3604 const char *Section = "__OBJC,__class,regular,no_dead_strip";
3605 // Check for a forward reference.
3606 llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name, true);
3608 assert(GV->getType()->getElementType() == ObjCTypes.ClassTy &&
3609 "Forward metaclass reference has incorrect type.");
3610 values.finishAndSetAsInitializer(GV);
3611 GV->setSection(Section);
3612 GV->setAlignment(CGM.getPointerAlign().getQuantity());
3613 CGM.addCompilerUsedGlobal(GV);
3615 GV = CreateMetadataVar(Name, values, Section, CGM.getPointerAlign(), true);
3616 DefinedClasses.push_back(GV);
3617 ImplementedClasses.push_back(Interface);
3618 // method definition entries must be clear for next implementation.
3619 MethodDefinitions.clear();
3622 llvm::Constant *CGObjCMac::EmitMetaClass(const ObjCImplementationDecl *ID,
3623 llvm::Constant *Protocols,
3624 ArrayRef<const ObjCMethodDecl*> Methods) {
3625 unsigned Flags = FragileABI_Class_Meta;
3626 unsigned Size = CGM.getDataLayout().getTypeAllocSize(ObjCTypes.ClassTy);
3628 if (ID->getClassInterface()->getVisibility() == HiddenVisibility)
3629 Flags |= FragileABI_Class_Hidden;
3631 ConstantInitBuilder builder(CGM);
3632 auto values = builder.beginStruct(ObjCTypes.ClassTy);
3633 // The isa for the metaclass is the root of the hierarchy.
3634 const ObjCInterfaceDecl *Root = ID->getClassInterface();
3635 while (const ObjCInterfaceDecl *Super = Root->getSuperClass())
3637 values.addBitCast(GetClassName(Root->getObjCRuntimeNameAsString()),
3638 ObjCTypes.ClassPtrTy);
3639 // The super class for the metaclass is emitted as the name of the
3640 // super class. The runtime fixes this up to point to the
3641 // *metaclass* for the super class.
3642 if (ObjCInterfaceDecl *Super = ID->getClassInterface()->getSuperClass()) {
3643 values.addBitCast(GetClassName(Super->getObjCRuntimeNameAsString()),
3644 ObjCTypes.ClassPtrTy);
3646 values.addNullPointer(ObjCTypes.ClassPtrTy);
3648 values.add(GetClassName(ID->getObjCRuntimeNameAsString()));
3649 // Version is always 0.
3650 values.addInt(ObjCTypes.LongTy, 0);
3651 values.addInt(ObjCTypes.LongTy, Flags);
3652 values.addInt(ObjCTypes.LongTy, Size);
3653 values.add(EmitIvarList(ID, true));
3654 values.add(emitMethodList(ID->getName(), MethodListType::ClassMethods,
3656 // cache is always NULL.
3657 values.addNullPointer(ObjCTypes.CachePtrTy);
3658 values.add(Protocols);
3659 // ivar_layout for metaclass is always NULL.
3660 values.addNullPointer(ObjCTypes.Int8PtrTy);
3661 // The class extension is used to store class properties for metaclasses.
3662 values.add(EmitClassExtension(ID, CharUnits::Zero(), false/*hasMRCWeak*/,
3663 /*isMetaclass*/true));
3665 std::string Name("OBJC_METACLASS_");
3666 Name += ID->getName();
3668 // Check for a forward reference.
3669 llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name, true);
3671 assert(GV->getType()->getElementType() == ObjCTypes.ClassTy &&
3672 "Forward metaclass reference has incorrect type.");
3673 values.finishAndSetAsInitializer(GV);
3675 GV = values.finishAndCreateGlobal(Name, CGM.getPointerAlign(),
3677 llvm::GlobalValue::PrivateLinkage);
3679 GV->setSection("__OBJC,__meta_class,regular,no_dead_strip");
3680 CGM.addCompilerUsedGlobal(GV);
3685 llvm::Constant *CGObjCMac::EmitMetaClassRef(const ObjCInterfaceDecl *ID) {
3686 std::string Name = "OBJC_METACLASS_" + ID->getNameAsString();
3688 // FIXME: Should we look these up somewhere other than the module. Its a bit
3689 // silly since we only generate these while processing an implementation, so
3690 // exactly one pointer would work if know when we entered/exitted an
3691 // implementation block.
3693 // Check for an existing forward reference.
3694 // Previously, metaclass with internal linkage may have been defined.
3695 // pass 'true' as 2nd argument so it is returned.
3696 llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name, true);
3698 GV = new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.ClassTy, false,
3699 llvm::GlobalValue::PrivateLinkage, nullptr,
3702 assert(GV->getType()->getElementType() == ObjCTypes.ClassTy &&
3703 "Forward metaclass reference has incorrect type.");
3707 llvm::Value *CGObjCMac::EmitSuperClassRef(const ObjCInterfaceDecl *ID) {
3708 std::string Name = "OBJC_CLASS_" + ID->getNameAsString();
3709 llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name, true);
3712 GV = new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.ClassTy, false,
3713 llvm::GlobalValue::PrivateLinkage, nullptr,
3716 assert(GV->getType()->getElementType() == ObjCTypes.ClassTy &&
3717 "Forward class metadata reference has incorrect type.");
3722 Emit a "class extension", which in this specific context means extra
3723 data that doesn't fit in the normal fragile-ABI class structure, and
3724 has nothing to do with the language concept of a class extension.
3726 struct objc_class_ext {
3728 const char *weak_ivar_layout;
3729 struct _objc_property_list *properties;
3733 CGObjCMac::EmitClassExtension(const ObjCImplementationDecl *ID,
3734 CharUnits InstanceSize, bool hasMRCWeakIvars,
3736 // Weak ivar layout.
3737 llvm::Constant *layout;
3739 layout = llvm::ConstantPointerNull::get(CGM.Int8PtrTy);
3741 layout = BuildWeakIvarLayout(ID, CharUnits::Zero(), InstanceSize,
3746 llvm::Constant *propertyList =
3747 EmitPropertyList((isMetaclass ? Twine("_OBJC_$_CLASS_PROP_LIST_")
3748 : Twine("_OBJC_$_PROP_LIST_"))
3750 ID, ID->getClassInterface(), ObjCTypes, isMetaclass);
3752 // Return null if no extension bits are used.
3753 if (layout->isNullValue() && propertyList->isNullValue()) {
3754 return llvm::Constant::getNullValue(ObjCTypes.ClassExtensionPtrTy);
3758 CGM.getDataLayout().getTypeAllocSize(ObjCTypes.ClassExtensionTy);
3760 ConstantInitBuilder builder(CGM);
3761 auto values = builder.beginStruct(ObjCTypes.ClassExtensionTy);
3762 values.addInt(ObjCTypes.IntTy, size);
3764 values.add(propertyList);
3766 return CreateMetadataVar("OBJC_CLASSEXT_" + ID->getName(), values,
3767 "__OBJC,__class_ext,regular,no_dead_strip",
3768 CGM.getPointerAlign(), true);
3778 struct objc_ivar_list {
3780 struct objc_ivar list[count];
3783 llvm::Constant *CGObjCMac::EmitIvarList(const ObjCImplementationDecl *ID,
3785 // When emitting the root class GCC emits ivar entries for the
3786 // actual class structure. It is not clear if we need to follow this
3787 // behavior; for now lets try and get away with not doing it. If so,
3788 // the cleanest solution would be to make up an ObjCInterfaceDecl
3791 return llvm::Constant::getNullValue(ObjCTypes.IvarListPtrTy);
3793 const ObjCInterfaceDecl *OID = ID->getClassInterface();
3795 ConstantInitBuilder builder(CGM);
3796 auto ivarList = builder.beginStruct();
3797 auto countSlot = ivarList.addPlaceholder();
3798 auto ivars = ivarList.beginArray(ObjCTypes.IvarTy);
3800 for (const ObjCIvarDecl *IVD = OID->all_declared_ivar_begin();
3801 IVD; IVD = IVD->getNextIvar()) {
3802 // Ignore unnamed bit-fields.
3803 if (!IVD->getDeclName())
3806 auto ivar = ivars.beginStruct(ObjCTypes.IvarTy);
3807 ivar.add(GetMethodVarName(IVD->getIdentifier()));
3808 ivar.add(GetMethodVarType(IVD));
3809 ivar.addInt(ObjCTypes.IntTy, ComputeIvarBaseOffset(CGM, OID, IVD));
3810 ivar.finishAndAddTo(ivars);
3813 // Return null for empty list.
3814 auto count = ivars.size();
3818 return llvm::Constant::getNullValue(ObjCTypes.IvarListPtrTy);
3821 ivars.finishAndAddTo(ivarList);
3822 ivarList.fillPlaceholderWithInt(countSlot, ObjCTypes.IntTy, count);
3824 llvm::GlobalVariable *GV;
3827 CreateMetadataVar("OBJC_CLASS_VARIABLES_" + ID->getName(), ivarList,
3828 "__OBJC,__class_vars,regular,no_dead_strip",
3829 CGM.getPointerAlign(), true);
3831 GV = CreateMetadataVar("OBJC_INSTANCE_VARIABLES_" + ID->getName(), ivarList,
3832 "__OBJC,__instance_vars,regular,no_dead_strip",
3833 CGM.getPointerAlign(), true);
3834 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.IvarListPtrTy);
3837 /// Build a struct objc_method_description constant for the given method.
3839 /// struct objc_method_description {
3840 /// SEL method_name;
3841 /// char *method_types;
3843 void CGObjCMac::emitMethodDescriptionConstant(ConstantArrayBuilder &builder,
3844 const ObjCMethodDecl *MD) {
3845 auto description = builder.beginStruct(ObjCTypes.MethodDescriptionTy);
3846 description.addBitCast(GetMethodVarName(MD->getSelector()),
3847 ObjCTypes.SelectorPtrTy);
3848 description.add(GetMethodVarType(MD));
3849 description.finishAndAddTo(builder);
3852 /// Build a struct objc_method constant for the given method.
3854 /// struct objc_method {
3855 /// SEL method_name;
3856 /// char *method_types;
3859 void CGObjCMac::emitMethodConstant(ConstantArrayBuilder &builder,
3860 const ObjCMethodDecl *MD) {
3861 llvm::Function *fn = GetMethodDefinition(MD);
3862 assert(fn && "no definition registered for method");
3864 auto method = builder.beginStruct(ObjCTypes.MethodTy);
3865 method.addBitCast(GetMethodVarName(MD->getSelector()),
3866 ObjCTypes.SelectorPtrTy);
3867 method.add(GetMethodVarType(MD));
3868 method.addBitCast(fn, ObjCTypes.Int8PtrTy);
3869 method.finishAndAddTo(builder);
3872 /// Build a struct objc_method_list or struct objc_method_description_list,
3875 /// struct objc_method_list {
3876 /// struct objc_method_list *obsolete;
3878 /// struct objc_method methods_list[count];
3881 /// struct objc_method_description_list {
3883 /// struct objc_method_description list[count];
3885 llvm::Constant *CGObjCMac::emitMethodList(Twine name, MethodListType MLT,
3886 ArrayRef<const ObjCMethodDecl *> methods) {
3889 bool forProtocol = false;
3891 case MethodListType::CategoryInstanceMethods:
3892 prefix = "OBJC_CATEGORY_INSTANCE_METHODS_";
3893 section = "__OBJC,__cat_inst_meth,regular,no_dead_strip";
3894 forProtocol = false;
3896 case MethodListType::CategoryClassMethods:
3897 prefix = "OBJC_CATEGORY_CLASS_METHODS_";
3898 section = "__OBJC,__cat_cls_meth,regular,no_dead_strip";
3899 forProtocol = false;
3901 case MethodListType::InstanceMethods:
3902 prefix = "OBJC_INSTANCE_METHODS_";
3903 section = "__OBJC,__inst_meth,regular,no_dead_strip";
3904 forProtocol = false;
3906 case MethodListType::ClassMethods:
3907 prefix = "OBJC_CLASS_METHODS_";
3908 section = "__OBJC,__cls_meth,regular,no_dead_strip";
3909 forProtocol = false;
3911 case MethodListType::ProtocolInstanceMethods:
3912 prefix = "OBJC_PROTOCOL_INSTANCE_METHODS_";
3913 section = "__OBJC,__cat_inst_meth,regular,no_dead_strip";
3916 case MethodListType::ProtocolClassMethods:
3917 prefix = "OBJC_PROTOCOL_CLASS_METHODS_";
3918 section = "__OBJC,__cat_cls_meth,regular,no_dead_strip";
3921 case MethodListType::OptionalProtocolInstanceMethods:
3922 prefix = "OBJC_PROTOCOL_INSTANCE_METHODS_OPT_";
3923 section = "__OBJC,__cat_inst_meth,regular,no_dead_strip";
3926 case MethodListType::OptionalProtocolClassMethods:
3927 prefix = "OBJC_PROTOCOL_CLASS_METHODS_OPT_";
3928 section = "__OBJC,__cat_cls_meth,regular,no_dead_strip";
3933 // Return null for empty list.
3934 if (methods.empty())
3935 return llvm::Constant::getNullValue(forProtocol
3936 ? ObjCTypes.MethodDescriptionListPtrTy
3937 : ObjCTypes.MethodListPtrTy);
3939 // For protocols, this is an objc_method_description_list, which has
3940 // a slightly different structure.
3942 ConstantInitBuilder builder(CGM);
3943 auto values = builder.beginStruct();
3944 values.addInt(ObjCTypes.IntTy, methods.size());
3945 auto methodArray = values.beginArray(ObjCTypes.MethodDescriptionTy);
3946 for (auto MD : methods) {
3947 emitMethodDescriptionConstant(methodArray, MD);
3949 methodArray.finishAndAddTo(values);
3951 llvm::GlobalVariable *GV = CreateMetadataVar(prefix + name, values, section,
3952 CGM.getPointerAlign(), true);
3953 return llvm::ConstantExpr::getBitCast(GV,
3954 ObjCTypes.MethodDescriptionListPtrTy);
3957 // Otherwise, it's an objc_method_list.
3958 ConstantInitBuilder builder(CGM);
3959 auto values = builder.beginStruct();
3960 values.addNullPointer(ObjCTypes.Int8PtrTy);
3961 values.addInt(ObjCTypes.IntTy, methods.size());
3962 auto methodArray = values.beginArray(ObjCTypes.MethodTy);
3963 for (auto MD : methods) {
3964 emitMethodConstant(methodArray, MD);
3966 methodArray.finishAndAddTo(values);
3968 llvm::GlobalVariable *GV = CreateMetadataVar(prefix + name, values, section,
3969 CGM.getPointerAlign(), true);
3970 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.MethodListPtrTy);
3973 llvm::Function *CGObjCCommonMac::GenerateMethod(const ObjCMethodDecl *OMD,
3974 const ObjCContainerDecl *CD) {
3975 SmallString<256> Name;
3976 GetNameForMethod(OMD, CD, Name);
3978 CodeGenTypes &Types = CGM.getTypes();
3979 llvm::FunctionType *MethodTy =
3980 Types.GetFunctionType(Types.arrangeObjCMethodDeclaration(OMD));
3981 llvm::Function *Method =
3982 llvm::Function::Create(MethodTy,
3983 llvm::GlobalValue::InternalLinkage,
3986 MethodDefinitions.insert(std::make_pair(OMD, Method));
3991 llvm::GlobalVariable *CGObjCCommonMac::CreateMetadataVar(Twine Name,
3992 ConstantStructBuilder &Init,
3996 llvm::GlobalValue::LinkageTypes LT =
3997 getLinkageTypeForObjCMetadata(CGM, Section);
3998 llvm::GlobalVariable *GV =
3999 Init.finishAndCreateGlobal(Name, Align, /*constant*/ false, LT);
4000 if (!Section.empty())
4001 GV->setSection(Section);
4003 CGM.addCompilerUsedGlobal(GV);
4007 llvm::GlobalVariable *CGObjCCommonMac::CreateMetadataVar(Twine Name,
4008 llvm::Constant *Init,
4012 llvm::Type *Ty = Init->getType();
4013 llvm::GlobalValue::LinkageTypes LT =
4014 getLinkageTypeForObjCMetadata(CGM, Section);
4015 llvm::GlobalVariable *GV =
4016 new llvm::GlobalVariable(CGM.getModule(), Ty, false, LT, Init, Name);
4017 if (!Section.empty())
4018 GV->setSection(Section);
4019 GV->setAlignment(Align.getQuantity());
4021 CGM.addCompilerUsedGlobal(GV);
4025 llvm::GlobalVariable *
4026 CGObjCCommonMac::CreateCStringLiteral(StringRef Name, ObjCLabelType Type,
4027 bool ForceNonFragileABI,
4028 bool NullTerminate) {
4031 case ObjCLabelType::ClassName: Label = "OBJC_CLASS_NAME_"; break;
4032 case ObjCLabelType::MethodVarName: Label = "OBJC_METH_VAR_NAME_"; break;
4033 case ObjCLabelType::MethodVarType: Label = "OBJC_METH_VAR_TYPE_"; break;
4034 case ObjCLabelType::PropertyName: Label = "OBJC_PROP_NAME_ATTR_"; break;
4037 bool NonFragile = ForceNonFragileABI || isNonFragileABI();
4041 case ObjCLabelType::ClassName:
4042 Section = NonFragile ? "__TEXT,__objc_classname,cstring_literals"
4043 : "__TEXT,__cstring,cstring_literals";
4045 case ObjCLabelType::MethodVarName:
4046 Section = NonFragile ? "__TEXT,__objc_methname,cstring_literals"
4047 : "__TEXT,__cstring,cstring_literals";
4049 case ObjCLabelType::MethodVarType:
4050 Section = NonFragile ? "__TEXT,__objc_methtype,cstring_literals"
4051 : "__TEXT,__cstring,cstring_literals";
4053 case ObjCLabelType::PropertyName:
4054 Section = "__TEXT,__cstring,cstring_literals";
4058 llvm::Constant *Value =
4059 llvm::ConstantDataArray::getString(VMContext, Name, NullTerminate);
4060 llvm::GlobalVariable *GV =
4061 new llvm::GlobalVariable(CGM.getModule(), Value->getType(),
4062 /*isConstant=*/true,
4063 llvm::GlobalValue::PrivateLinkage, Value, Label);
4064 if (CGM.getTriple().isOSBinFormatMachO())
4065 GV->setSection(Section);
4066 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
4067 GV->setAlignment(CharUnits::One().getQuantity());
4068 CGM.addCompilerUsedGlobal(GV);
4073 llvm::Function *CGObjCMac::ModuleInitFunction() {
4074 // Abuse this interface function as a place to finalize.
4079 llvm::FunctionCallee CGObjCMac::GetPropertyGetFunction() {
4080 return ObjCTypes.getGetPropertyFn();
4083 llvm::FunctionCallee CGObjCMac::GetPropertySetFunction() {
4084 return ObjCTypes.getSetPropertyFn();
4087 llvm::FunctionCallee CGObjCMac::GetOptimizedPropertySetFunction(bool atomic,
4089 return ObjCTypes.getOptimizedSetPropertyFn(atomic, copy);
4092 llvm::FunctionCallee CGObjCMac::GetGetStructFunction() {
4093 return ObjCTypes.getCopyStructFn();
4096 llvm::FunctionCallee CGObjCMac::GetSetStructFunction() {
4097 return ObjCTypes.getCopyStructFn();
4100 llvm::FunctionCallee CGObjCMac::GetCppAtomicObjectGetFunction() {
4101 return ObjCTypes.getCppAtomicObjectFunction();
4104 llvm::FunctionCallee CGObjCMac::GetCppAtomicObjectSetFunction() {
4105 return ObjCTypes.getCppAtomicObjectFunction();
4108 llvm::FunctionCallee CGObjCMac::EnumerationMutationFunction() {
4109 return ObjCTypes.getEnumerationMutationFn();
4112 void CGObjCMac::EmitTryStmt(CodeGenFunction &CGF, const ObjCAtTryStmt &S) {
4113 return EmitTryOrSynchronizedStmt(CGF, S);
4116 void CGObjCMac::EmitSynchronizedStmt(CodeGenFunction &CGF,
4117 const ObjCAtSynchronizedStmt &S) {
4118 return EmitTryOrSynchronizedStmt(CGF, S);
4122 struct PerformFragileFinally final : EHScopeStack::Cleanup {
4124 Address SyncArgSlot;
4125 Address CallTryExitVar;
4126 Address ExceptionData;
4127 ObjCTypesHelper &ObjCTypes;
4128 PerformFragileFinally(const Stmt *S,
4129 Address SyncArgSlot,
4130 Address CallTryExitVar,
4131 Address ExceptionData,
4132 ObjCTypesHelper *ObjCTypes)
4133 : S(*S), SyncArgSlot(SyncArgSlot), CallTryExitVar(CallTryExitVar),
4134 ExceptionData(ExceptionData), ObjCTypes(*ObjCTypes) {}
4136 void Emit(CodeGenFunction &CGF, Flags flags) override {
4137 // Check whether we need to call objc_exception_try_exit.
4138 // In optimized code, this branch will always be folded.
4139 llvm::BasicBlock *FinallyCallExit =
4140 CGF.createBasicBlock("finally.call_exit");
4141 llvm::BasicBlock *FinallyNoCallExit =
4142 CGF.createBasicBlock("finally.no_call_exit");
4143 CGF.Builder.CreateCondBr(CGF.Builder.CreateLoad(CallTryExitVar),
4144 FinallyCallExit, FinallyNoCallExit);
4146 CGF.EmitBlock(FinallyCallExit);
4147 CGF.EmitNounwindRuntimeCall(ObjCTypes.getExceptionTryExitFn(),
4148 ExceptionData.getPointer());
4150 CGF.EmitBlock(FinallyNoCallExit);
4152 if (isa<ObjCAtTryStmt>(S)) {
4153 if (const ObjCAtFinallyStmt* FinallyStmt =
4154 cast<ObjCAtTryStmt>(S).getFinallyStmt()) {
4155 // Don't try to do the @finally if this is an EH cleanup.
4156 if (flags.isForEHCleanup()) return;
4158 // Save the current cleanup destination in case there's
4159 // control flow inside the finally statement.
4160 llvm::Value *CurCleanupDest =
4161 CGF.Builder.CreateLoad(CGF.getNormalCleanupDestSlot());
4163 CGF.EmitStmt(FinallyStmt->getFinallyBody());
4165 if (CGF.HaveInsertPoint()) {
4166 CGF.Builder.CreateStore(CurCleanupDest,
4167 CGF.getNormalCleanupDestSlot());
4169 // Currently, the end of the cleanup must always exist.
4170 CGF.EnsureInsertPoint();
4174 // Emit objc_sync_exit(expr); as finally's sole statement for
4176 llvm::Value *SyncArg = CGF.Builder.CreateLoad(SyncArgSlot);
4177 CGF.EmitNounwindRuntimeCall(ObjCTypes.getSyncExitFn(), SyncArg);
4182 class FragileHazards {
4183 CodeGenFunction &CGF;
4184 SmallVector<llvm::Value*, 20> Locals;
4185 llvm::DenseSet<llvm::BasicBlock*> BlocksBeforeTry;
4187 llvm::InlineAsm *ReadHazard;
4188 llvm::InlineAsm *WriteHazard;
4190 llvm::FunctionType *GetAsmFnType();
4192 void collectLocals();
4193 void emitReadHazard(CGBuilderTy &Builder);
4196 FragileHazards(CodeGenFunction &CGF);
4198 void emitWriteHazard();
4199 void emitHazardsInNewBlocks();
4201 } // end anonymous namespace
4203 /// Create the fragile-ABI read and write hazards based on the current
4204 /// state of the function, which is presumed to be immediately prior
4205 /// to a @try block. These hazards are used to maintain correct
4206 /// semantics in the face of optimization and the fragile ABI's
4207 /// cavalier use of setjmp/longjmp.
4208 FragileHazards::FragileHazards(CodeGenFunction &CGF) : CGF(CGF) {
4211 if (Locals.empty()) return;
4213 // Collect all the blocks in the function.
4214 for (llvm::Function::iterator
4215 I = CGF.CurFn->begin(), E = CGF.CurFn->end(); I != E; ++I)
4216 BlocksBeforeTry.insert(&*I);
4218 llvm::FunctionType *AsmFnTy = GetAsmFnType();
4220 // Create a read hazard for the allocas. This inhibits dead-store
4221 // optimizations and forces the values to memory. This hazard is
4222 // inserted before any 'throwing' calls in the protected scope to
4223 // reflect the possibility that the variables might be read from the
4224 // catch block if the call throws.
4226 std::string Constraint;
4227 for (unsigned I = 0, E = Locals.size(); I != E; ++I) {
4228 if (I) Constraint += ',';
4232 ReadHazard = llvm::InlineAsm::get(AsmFnTy, "", Constraint, true, false);
4235 // Create a write hazard for the allocas. This inhibits folding
4236 // loads across the hazard. This hazard is inserted at the
4237 // beginning of the catch path to reflect the possibility that the
4238 // variables might have been written within the protected scope.
4240 std::string Constraint;
4241 for (unsigned I = 0, E = Locals.size(); I != E; ++I) {
4242 if (I) Constraint += ',';
4243 Constraint += "=*m";
4246 WriteHazard = llvm::InlineAsm::get(AsmFnTy, "", Constraint, true, false);
4250 /// Emit a write hazard at the current location.
4251 void FragileHazards::emitWriteHazard() {
4252 if (Locals.empty()) return;
4254 CGF.EmitNounwindRuntimeCall(WriteHazard, Locals);
4257 void FragileHazards::emitReadHazard(CGBuilderTy &Builder) {
4258 assert(!Locals.empty());
4259 llvm::CallInst *call = Builder.CreateCall(ReadHazard, Locals);
4260 call->setDoesNotThrow();
4261 call->setCallingConv(CGF.getRuntimeCC());
4264 /// Emit read hazards in all the protected blocks, i.e. all the blocks
4265 /// which have been inserted since the beginning of the try.
4266 void FragileHazards::emitHazardsInNewBlocks() {
4267 if (Locals.empty()) return;
4269 CGBuilderTy Builder(CGF, CGF.getLLVMContext());
4271 // Iterate through all blocks, skipping those prior to the try.
4272 for (llvm::Function::iterator
4273 FI = CGF.CurFn->begin(), FE = CGF.CurFn->end(); FI != FE; ++FI) {
4274 llvm::BasicBlock &BB = *FI;
4275 if (BlocksBeforeTry.count(&BB)) continue;
4277 // Walk through all the calls in the block.
4278 for (llvm::BasicBlock::iterator
4279 BI = BB.begin(), BE = BB.end(); BI != BE; ++BI) {
4280 llvm::Instruction &I = *BI;
4282 // Ignore instructions that aren't non-intrinsic calls.
4283 // These are the only calls that can possibly call longjmp.
4284 if (!isa<llvm::CallInst>(I) && !isa<llvm::InvokeInst>(I))
4286 if (isa<llvm::IntrinsicInst>(I))
4289 // Ignore call sites marked nounwind. This may be questionable,
4290 // since 'nounwind' doesn't necessarily mean 'does not call longjmp'.
4291 if (cast<llvm::CallBase>(I).doesNotThrow())
4294 // Insert a read hazard before the call. This will ensure that
4295 // any writes to the locals are performed before making the
4296 // call. If the call throws, then this is sufficient to
4297 // guarantee correctness as long as it doesn't also write to any
4299 Builder.SetInsertPoint(&BB, BI);
4300 emitReadHazard(Builder);
4305 static void addIfPresent(llvm::DenseSet<llvm::Value*> &S, Address V) {
4306 if (V.isValid()) S.insert(V.getPointer());
4309 void FragileHazards::collectLocals() {
4310 // Compute a set of allocas to ignore.
4311 llvm::DenseSet<llvm::Value*> AllocasToIgnore;
4312 addIfPresent(AllocasToIgnore, CGF.ReturnValue);
4313 addIfPresent(AllocasToIgnore, CGF.NormalCleanupDest);
4315 // Collect all the allocas currently in the function. This is
4316 // probably way too aggressive.
4317 llvm::BasicBlock &Entry = CGF.CurFn->getEntryBlock();
4318 for (llvm::BasicBlock::iterator
4319 I = Entry.begin(), E = Entry.end(); I != E; ++I)
4320 if (isa<llvm::AllocaInst>(*I) && !AllocasToIgnore.count(&*I))
4321 Locals.push_back(&*I);
4324 llvm::FunctionType *FragileHazards::GetAsmFnType() {
4325 SmallVector<llvm::Type *, 16> tys(Locals.size());
4326 for (unsigned i = 0, e = Locals.size(); i != e; ++i)
4327 tys[i] = Locals[i]->getType();
4328 return llvm::FunctionType::get(CGF.VoidTy, tys, false);
4333 Objective-C setjmp-longjmp (sjlj) Exception Handling
4336 A catch buffer is a setjmp buffer plus:
4337 - a pointer to the exception that was caught
4338 - a pointer to the previous exception data buffer
4339 - two pointers of reserved storage
4340 Therefore catch buffers form a stack, with a pointer to the top
4341 of the stack kept in thread-local storage.
4343 objc_exception_try_enter pushes a catch buffer onto the EH stack.
4344 objc_exception_try_exit pops the given catch buffer, which is
4345 required to be the top of the EH stack.
4346 objc_exception_throw pops the top of the EH stack, writes the
4347 thrown exception into the appropriate field, and longjmps
4348 to the setjmp buffer. It crashes the process (with a printf
4349 and an abort()) if there are no catch buffers on the stack.
4350 objc_exception_extract just reads the exception pointer out of the
4353 There's no reason an implementation couldn't use a light-weight
4354 setjmp here --- something like __builtin_setjmp, but API-compatible
4355 with the heavyweight setjmp. This will be more important if we ever
4356 want to implement correct ObjC/C++ exception interactions for the
4359 Note that for this use of setjmp/longjmp to be correct, we may need
4360 to mark some local variables volatile: if a non-volatile local
4361 variable is modified between the setjmp and the longjmp, it has
4362 indeterminate value. For the purposes of LLVM IR, it may be
4363 sufficient to make loads and stores within the @try (to variables
4364 declared outside the @try) volatile. This is necessary for
4365 optimized correctness, but is not currently being done; this is
4366 being tracked as rdar://problem/8160285
4368 The basic framework for a @try-catch-finally is as follows:
4370 objc_exception_data d;
4372 bool _call_try_exit = true;
4374 objc_exception_try_enter(&d);
4375 if (!setjmp(d.jmp_buf)) {
4379 id _caught = objc_exception_extract(&d);
4381 // enter new try scope for handlers
4382 if (!setjmp(d.jmp_buf)) {
4383 ... match exception and execute catch blocks ...
4385 // fell off end, rethrow.
4387 ... jump-through-finally to finally_rethrow ...
4389 // exception in catch block
4390 _rethrow = objc_exception_extract(&d);
4391 _call_try_exit = false;
4392 ... jump-through-finally to finally_rethrow ...
4395 ... jump-through-finally to finally_end ...
4399 objc_exception_try_exit(&d);
4401 ... finally block ....
4402 ... dispatch to finally destination ...
4405 objc_exception_throw(_rethrow);
4410 This framework differs slightly from the one gcc uses, in that gcc
4411 uses _rethrow to determine if objc_exception_try_exit should be called
4412 and if the object should be rethrown. This breaks in the face of
4413 throwing nil and introduces unnecessary branches.
4415 We specialize this framework for a few particular circumstances:
4417 - If there are no catch blocks, then we avoid emitting the second
4418 exception handling context.
4420 - If there is a catch-all catch block (i.e. @catch(...) or @catch(id
4421 e)) we avoid emitting the code to rethrow an uncaught exception.
4423 - FIXME: If there is no @finally block we can do a few more
4426 Rethrows and Jumps-Through-Finally
4429 '@throw;' is supported by pushing the currently-caught exception
4430 onto ObjCEHStack while the @catch blocks are emitted.
4432 Branches through the @finally block are handled with an ordinary
4433 normal cleanup. We do not register an EH cleanup; fragile-ABI ObjC
4434 exceptions are not compatible with C++ exceptions, and this is
4435 hardly the only place where this will go wrong.
4437 @synchronized(expr) { stmt; } is emitted as if it were:
4438 id synch_value = expr;
4439 objc_sync_enter(synch_value);
4440 @try { stmt; } @finally { objc_sync_exit(synch_value); }
4443 void CGObjCMac::EmitTryOrSynchronizedStmt(CodeGen::CodeGenFunction &CGF,
4445 bool isTry = isa<ObjCAtTryStmt>(S);
4447 // A destination for the fall-through edges of the catch handlers to
4449 CodeGenFunction::JumpDest FinallyEnd =
4450 CGF.getJumpDestInCurrentScope("finally.end");
4452 // A destination for the rethrow edge of the catch handlers to jump
4454 CodeGenFunction::JumpDest FinallyRethrow =
4455 CGF.getJumpDestInCurrentScope("finally.rethrow");
4457 // For @synchronized, call objc_sync_enter(sync.expr). The
4458 // evaluation of the expression must occur before we enter the
4459 // @synchronized. We can't avoid a temp here because we need the
4460 // value to be preserved. If the backend ever does liveness
4461 // correctly after setjmp, this will be unnecessary.
4462 Address SyncArgSlot = Address::invalid();
4464 llvm::Value *SyncArg =
4465 CGF.EmitScalarExpr(cast<ObjCAtSynchronizedStmt>(S).getSynchExpr());
4466 SyncArg = CGF.Builder.CreateBitCast(SyncArg, ObjCTypes.ObjectPtrTy);
4467 CGF.EmitNounwindRuntimeCall(ObjCTypes.getSyncEnterFn(), SyncArg);
4469 SyncArgSlot = CGF.CreateTempAlloca(SyncArg->getType(),
4470 CGF.getPointerAlign(), "sync.arg");
4471 CGF.Builder.CreateStore(SyncArg, SyncArgSlot);
4474 // Allocate memory for the setjmp buffer. This needs to be kept
4475 // live throughout the try and catch blocks.
4476 Address ExceptionData = CGF.CreateTempAlloca(ObjCTypes.ExceptionDataTy,
4477 CGF.getPointerAlign(),
4478 "exceptiondata.ptr");
4480 // Create the fragile hazards. Note that this will not capture any
4481 // of the allocas required for exception processing, but will
4482 // capture the current basic block (which extends all the way to the
4483 // setjmp call) as "before the @try".
4484 FragileHazards Hazards(CGF);
4486 // Create a flag indicating whether the cleanup needs to call
4487 // objc_exception_try_exit. This is true except when
4488 // - no catches match and we're branching through the cleanup
4489 // just to rethrow the exception, or
4490 // - a catch matched and we're falling out of the catch handler.
4491 // The setjmp-safety rule here is that we should always store to this
4492 // variable in a place that dominates the branch through the cleanup
4493 // without passing through any setjmps.
4494 Address CallTryExitVar = CGF.CreateTempAlloca(CGF.Builder.getInt1Ty(),
4498 // A slot containing the exception to rethrow. Only needed when we
4499 // have both a @catch and a @finally.
4500 Address PropagatingExnVar = Address::invalid();
4502 // Push a normal cleanup to leave the try scope.
4503 CGF.EHStack.pushCleanup<PerformFragileFinally>(NormalAndEHCleanup, &S,
4509 // Enter a try block:
4510 // - Call objc_exception_try_enter to push ExceptionData on top of
4512 CGF.EmitNounwindRuntimeCall(ObjCTypes.getExceptionTryEnterFn(),
4513 ExceptionData.getPointer());
4515 // - Call setjmp on the exception data buffer.
4516 llvm::Constant *Zero = llvm::ConstantInt::get(CGF.Builder.getInt32Ty(), 0);
4517 llvm::Value *GEPIndexes[] = { Zero, Zero, Zero };
4518 llvm::Value *SetJmpBuffer = CGF.Builder.CreateGEP(
4519 ObjCTypes.ExceptionDataTy, ExceptionData.getPointer(), GEPIndexes,
4521 llvm::CallInst *SetJmpResult = CGF.EmitNounwindRuntimeCall(
4522 ObjCTypes.getSetJmpFn(), SetJmpBuffer, "setjmp_result");
4523 SetJmpResult->setCanReturnTwice();
4525 // If setjmp returned 0, enter the protected block; otherwise,
4526 // branch to the handler.
4527 llvm::BasicBlock *TryBlock = CGF.createBasicBlock("try");
4528 llvm::BasicBlock *TryHandler = CGF.createBasicBlock("try.handler");
4529 llvm::Value *DidCatch =
4530 CGF.Builder.CreateIsNotNull(SetJmpResult, "did_catch_exception");
4531 CGF.Builder.CreateCondBr(DidCatch, TryHandler, TryBlock);
4533 // Emit the protected block.
4534 CGF.EmitBlock(TryBlock);
4535 CGF.Builder.CreateStore(CGF.Builder.getTrue(), CallTryExitVar);
4536 CGF.EmitStmt(isTry ? cast<ObjCAtTryStmt>(S).getTryBody()
4537 : cast<ObjCAtSynchronizedStmt>(S).getSynchBody());
4539 CGBuilderTy::InsertPoint TryFallthroughIP = CGF.Builder.saveAndClearIP();
4541 // Emit the exception handler block.
4542 CGF.EmitBlock(TryHandler);
4544 // Don't optimize loads of the in-scope locals across this point.
4545 Hazards.emitWriteHazard();
4547 // For a @synchronized (or a @try with no catches), just branch
4548 // through the cleanup to the rethrow block.
4549 if (!isTry || !cast<ObjCAtTryStmt>(S).getNumCatchStmts()) {
4550 // Tell the cleanup not to re-pop the exit.
4551 CGF.Builder.CreateStore(CGF.Builder.getFalse(), CallTryExitVar);
4552 CGF.EmitBranchThroughCleanup(FinallyRethrow);
4554 // Otherwise, we have to match against the caught exceptions.
4556 // Retrieve the exception object. We may emit multiple blocks but
4557 // nothing can cross this so the value is already in SSA form.
4558 llvm::CallInst *Caught =
4559 CGF.EmitNounwindRuntimeCall(ObjCTypes.getExceptionExtractFn(),
4560 ExceptionData.getPointer(), "caught");
4562 // Push the exception to rethrow onto the EH value stack for the
4563 // benefit of any @throws in the handlers.
4564 CGF.ObjCEHValueStack.push_back(Caught);
4566 const ObjCAtTryStmt* AtTryStmt = cast<ObjCAtTryStmt>(&S);
4568 bool HasFinally = (AtTryStmt->getFinallyStmt() != nullptr);
4570 llvm::BasicBlock *CatchBlock = nullptr;
4571 llvm::BasicBlock *CatchHandler = nullptr;
4573 // Save the currently-propagating exception before
4574 // objc_exception_try_enter clears the exception slot.
4575 PropagatingExnVar = CGF.CreateTempAlloca(Caught->getType(),
4576 CGF.getPointerAlign(),
4577 "propagating_exception");
4578 CGF.Builder.CreateStore(Caught, PropagatingExnVar);
4580 // Enter a new exception try block (in case a @catch block
4581 // throws an exception).
4582 CGF.EmitNounwindRuntimeCall(ObjCTypes.getExceptionTryEnterFn(),
4583 ExceptionData.getPointer());
4585 llvm::CallInst *SetJmpResult =
4586 CGF.EmitNounwindRuntimeCall(ObjCTypes.getSetJmpFn(),
4587 SetJmpBuffer, "setjmp.result");
4588 SetJmpResult->setCanReturnTwice();
4590 llvm::Value *Threw =
4591 CGF.Builder.CreateIsNotNull(SetJmpResult, "did_catch_exception");
4593 CatchBlock = CGF.createBasicBlock("catch");
4594 CatchHandler = CGF.createBasicBlock("catch_for_catch");
4595 CGF.Builder.CreateCondBr(Threw, CatchHandler, CatchBlock);
4597 CGF.EmitBlock(CatchBlock);
4600 CGF.Builder.CreateStore(CGF.Builder.getInt1(HasFinally), CallTryExitVar);
4602 // Handle catch list. As a special case we check if everything is
4603 // matched and avoid generating code for falling off the end if
4605 bool AllMatched = false;
4606 for (unsigned I = 0, N = AtTryStmt->getNumCatchStmts(); I != N; ++I) {
4607 const ObjCAtCatchStmt *CatchStmt = AtTryStmt->getCatchStmt(I);
4609 const VarDecl *CatchParam = CatchStmt->getCatchParamDecl();
4610 const ObjCObjectPointerType *OPT = nullptr;
4612 // catch(...) always matches.
4616 OPT = CatchParam->getType()->getAs<ObjCObjectPointerType>();
4618 // catch(id e) always matches under this ABI, since only
4619 // ObjC exceptions end up here in the first place.
4620 // FIXME: For the time being we also match id<X>; this should
4621 // be rejected by Sema instead.
4622 if (OPT && (OPT->isObjCIdType() || OPT->isObjCQualifiedIdType()))
4626 // If this is a catch-all, we don't need to test anything.
4628 CodeGenFunction::RunCleanupsScope CatchVarCleanups(CGF);
4631 CGF.EmitAutoVarDecl(*CatchParam);
4632 assert(CGF.HaveInsertPoint() && "DeclStmt destroyed insert point?");
4634 // These types work out because ConvertType(id) == i8*.
4635 EmitInitOfCatchParam(CGF, Caught, CatchParam);
4638 CGF.EmitStmt(CatchStmt->getCatchBody());
4640 // The scope of the catch variable ends right here.
4641 CatchVarCleanups.ForceCleanup();
4643 CGF.EmitBranchThroughCleanup(FinallyEnd);
4647 assert(OPT && "Unexpected non-object pointer type in @catch");
4648 const ObjCObjectType *ObjTy = OPT->getObjectType();
4650 // FIXME: @catch (Class c) ?
4651 ObjCInterfaceDecl *IDecl = ObjTy->getInterface();
4652 assert(IDecl && "Catch parameter must have Objective-C type!");
4654 // Check if the @catch block matches the exception object.
4655 llvm::Value *Class = EmitClassRef(CGF, IDecl);
4657 llvm::Value *matchArgs[] = { Class, Caught };
4658 llvm::CallInst *Match =
4659 CGF.EmitNounwindRuntimeCall(ObjCTypes.getExceptionMatchFn(),
4660 matchArgs, "match");
4662 llvm::BasicBlock *MatchedBlock = CGF.createBasicBlock("match");
4663 llvm::BasicBlock *NextCatchBlock = CGF.createBasicBlock("catch.next");
4665 CGF.Builder.CreateCondBr(CGF.Builder.CreateIsNotNull(Match, "matched"),
4666 MatchedBlock, NextCatchBlock);
4668 // Emit the @catch block.
4669 CGF.EmitBlock(MatchedBlock);
4671 // Collect any cleanups for the catch variable. The scope lasts until
4672 // the end of the catch body.
4673 CodeGenFunction::RunCleanupsScope CatchVarCleanups(CGF);
4675 CGF.EmitAutoVarDecl(*CatchParam);
4676 assert(CGF.HaveInsertPoint() && "DeclStmt destroyed insert point?");
4678 // Initialize the catch variable.
4680 CGF.Builder.CreateBitCast(Caught,
4681 CGF.ConvertType(CatchParam->getType()));
4682 EmitInitOfCatchParam(CGF, Tmp, CatchParam);
4684 CGF.EmitStmt(CatchStmt->getCatchBody());
4686 // We're done with the catch variable.
4687 CatchVarCleanups.ForceCleanup();
4689 CGF.EmitBranchThroughCleanup(FinallyEnd);
4691 CGF.EmitBlock(NextCatchBlock);
4694 CGF.ObjCEHValueStack.pop_back();
4696 // If nothing wanted anything to do with the caught exception,
4697 // kill the extract call.
4698 if (Caught->use_empty())
4699 Caught->eraseFromParent();
4702 CGF.EmitBranchThroughCleanup(FinallyRethrow);
4705 // Emit the exception handler for the @catch blocks.
4706 CGF.EmitBlock(CatchHandler);
4708 // In theory we might now need a write hazard, but actually it's
4709 // unnecessary because there's no local-accessing code between
4710 // the try's write hazard and here.
4711 //Hazards.emitWriteHazard();
4713 // Extract the new exception and save it to the
4714 // propagating-exception slot.
4715 assert(PropagatingExnVar.isValid());
4716 llvm::CallInst *NewCaught =
4717 CGF.EmitNounwindRuntimeCall(ObjCTypes.getExceptionExtractFn(),
4718 ExceptionData.getPointer(), "caught");
4719 CGF.Builder.CreateStore(NewCaught, PropagatingExnVar);
4721 // Don't pop the catch handler; the throw already did.
4722 CGF.Builder.CreateStore(CGF.Builder.getFalse(), CallTryExitVar);
4723 CGF.EmitBranchThroughCleanup(FinallyRethrow);
4727 // Insert read hazards as required in the new blocks.
4728 Hazards.emitHazardsInNewBlocks();
4731 CGF.Builder.restoreIP(TryFallthroughIP);
4732 if (CGF.HaveInsertPoint())
4733 CGF.Builder.CreateStore(CGF.Builder.getTrue(), CallTryExitVar);
4734 CGF.PopCleanupBlock();
4735 CGF.EmitBlock(FinallyEnd.getBlock(), true);
4737 // Emit the rethrow block.
4738 CGBuilderTy::InsertPoint SavedIP = CGF.Builder.saveAndClearIP();
4739 CGF.EmitBlock(FinallyRethrow.getBlock(), true);
4740 if (CGF.HaveInsertPoint()) {
4741 // If we have a propagating-exception variable, check it.
4742 llvm::Value *PropagatingExn;
4743 if (PropagatingExnVar.isValid()) {
4744 PropagatingExn = CGF.Builder.CreateLoad(PropagatingExnVar);
4746 // Otherwise, just look in the buffer for the exception to throw.
4748 llvm::CallInst *Caught =
4749 CGF.EmitNounwindRuntimeCall(ObjCTypes.getExceptionExtractFn(),
4750 ExceptionData.getPointer());
4751 PropagatingExn = Caught;
4754 CGF.EmitNounwindRuntimeCall(ObjCTypes.getExceptionThrowFn(),
4756 CGF.Builder.CreateUnreachable();
4759 CGF.Builder.restoreIP(SavedIP);
4762 void CGObjCMac::EmitThrowStmt(CodeGen::CodeGenFunction &CGF,
4763 const ObjCAtThrowStmt &S,
4764 bool ClearInsertionPoint) {
4765 llvm::Value *ExceptionAsObject;
4767 if (const Expr *ThrowExpr = S.getThrowExpr()) {
4768 llvm::Value *Exception = CGF.EmitObjCThrowOperand(ThrowExpr);
4770 CGF.Builder.CreateBitCast(Exception, ObjCTypes.ObjectPtrTy);
4772 assert((!CGF.ObjCEHValueStack.empty() && CGF.ObjCEHValueStack.back()) &&
4773 "Unexpected rethrow outside @catch block.");
4774 ExceptionAsObject = CGF.ObjCEHValueStack.back();
4777 CGF.EmitRuntimeCall(ObjCTypes.getExceptionThrowFn(), ExceptionAsObject)
4778 ->setDoesNotReturn();
4779 CGF.Builder.CreateUnreachable();
4781 // Clear the insertion point to indicate we are in unreachable code.
4782 if (ClearInsertionPoint)
4783 CGF.Builder.ClearInsertionPoint();
4786 /// EmitObjCWeakRead - Code gen for loading value of a __weak
4787 /// object: objc_read_weak (id *src)
4789 llvm::Value * CGObjCMac::EmitObjCWeakRead(CodeGen::CodeGenFunction &CGF,
4790 Address AddrWeakObj) {
4791 llvm::Type* DestTy = AddrWeakObj.getElementType();
4792 AddrWeakObj = CGF.Builder.CreateBitCast(AddrWeakObj,
4793 ObjCTypes.PtrObjectPtrTy);
4794 llvm::Value *read_weak =
4795 CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcReadWeakFn(),
4796 AddrWeakObj.getPointer(), "weakread");
4797 read_weak = CGF.Builder.CreateBitCast(read_weak, DestTy);
4801 /// EmitObjCWeakAssign - Code gen for assigning to a __weak object.
4802 /// objc_assign_weak (id src, id *dst)
4804 void CGObjCMac::EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF,
4805 llvm::Value *src, Address dst) {
4806 llvm::Type * SrcTy = src->getType();
4807 if (!isa<llvm::PointerType>(SrcTy)) {
4808 unsigned Size = CGM.getDataLayout().getTypeAllocSize(SrcTy);
4809 assert(Size <= 8 && "does not support size > 8");
4810 src = (Size == 4) ? CGF.Builder.CreateBitCast(src, CGM.Int32Ty)
4811 : CGF.Builder.CreateBitCast(src, CGM.Int64Ty);
4812 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy);
4814 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy);
4815 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy);
4816 llvm::Value *args[] = { src, dst.getPointer() };
4817 CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignWeakFn(),
4818 args, "weakassign");
4821 /// EmitObjCGlobalAssign - Code gen for assigning to a __strong object.
4822 /// objc_assign_global (id src, id *dst)
4824 void CGObjCMac::EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF,
4825 llvm::Value *src, Address dst,
4827 llvm::Type * SrcTy = src->getType();
4828 if (!isa<llvm::PointerType>(SrcTy)) {
4829 unsigned Size = CGM.getDataLayout().getTypeAllocSize(SrcTy);
4830 assert(Size <= 8 && "does not support size > 8");
4831 src = (Size == 4) ? CGF.Builder.CreateBitCast(src, CGM.Int32Ty)
4832 : CGF.Builder.CreateBitCast(src, CGM.Int64Ty);
4833 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy);
4835 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy);
4836 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy);
4837 llvm::Value *args[] = { src, dst.getPointer() };
4839 CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignGlobalFn(),
4840 args, "globalassign");
4842 CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignThreadLocalFn(),
4843 args, "threadlocalassign");
4846 /// EmitObjCIvarAssign - Code gen for assigning to a __strong object.
4847 /// objc_assign_ivar (id src, id *dst, ptrdiff_t ivaroffset)
4849 void CGObjCMac::EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF,
4850 llvm::Value *src, Address dst,
4851 llvm::Value *ivarOffset) {
4852 assert(ivarOffset && "EmitObjCIvarAssign - ivarOffset is NULL");
4853 llvm::Type * SrcTy = src->getType();
4854 if (!isa<llvm::PointerType>(SrcTy)) {
4855 unsigned Size = CGM.getDataLayout().getTypeAllocSize(SrcTy);
4856 assert(Size <= 8 && "does not support size > 8");
4857 src = (Size == 4) ? CGF.Builder.CreateBitCast(src, CGM.Int32Ty)
4858 : CGF.Builder.CreateBitCast(src, CGM.Int64Ty);
4859 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy);
4861 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy);
4862 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy);
4863 llvm::Value *args[] = { src, dst.getPointer(), ivarOffset };
4864 CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignIvarFn(), args);
4867 /// EmitObjCStrongCastAssign - Code gen for assigning to a __strong cast object.
4868 /// objc_assign_strongCast (id src, id *dst)
4870 void CGObjCMac::EmitObjCStrongCastAssign(CodeGen::CodeGenFunction &CGF,
4871 llvm::Value *src, Address dst) {
4872 llvm::Type * SrcTy = src->getType();
4873 if (!isa<llvm::PointerType>(SrcTy)) {
4874 unsigned Size = CGM.getDataLayout().getTypeAllocSize(SrcTy);
4875 assert(Size <= 8 && "does not support size > 8");
4876 src = (Size == 4) ? CGF.Builder.CreateBitCast(src, CGM.Int32Ty)
4877 : CGF.Builder.CreateBitCast(src, CGM.Int64Ty);
4878 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy);
4880 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy);
4881 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy);
4882 llvm::Value *args[] = { src, dst.getPointer() };
4883 CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignStrongCastFn(),
4884 args, "strongassign");
4887 void CGObjCMac::EmitGCMemmoveCollectable(CodeGen::CodeGenFunction &CGF,
4890 llvm::Value *size) {
4891 SrcPtr = CGF.Builder.CreateBitCast(SrcPtr, ObjCTypes.Int8PtrTy);
4892 DestPtr = CGF.Builder.CreateBitCast(DestPtr, ObjCTypes.Int8PtrTy);
4893 llvm::Value *args[] = { DestPtr.getPointer(), SrcPtr.getPointer(), size };
4894 CGF.EmitNounwindRuntimeCall(ObjCTypes.GcMemmoveCollectableFn(), args);
4897 /// EmitObjCValueForIvar - Code Gen for ivar reference.
4899 LValue CGObjCMac::EmitObjCValueForIvar(CodeGen::CodeGenFunction &CGF,
4901 llvm::Value *BaseValue,
4902 const ObjCIvarDecl *Ivar,
4903 unsigned CVRQualifiers) {
4904 const ObjCInterfaceDecl *ID =
4905 ObjectTy->getAs<ObjCObjectType>()->getInterface();
4906 return EmitValueForIvarAtOffset(CGF, ID, BaseValue, Ivar, CVRQualifiers,
4907 EmitIvarOffset(CGF, ID, Ivar));
4910 llvm::Value *CGObjCMac::EmitIvarOffset(CodeGen::CodeGenFunction &CGF,
4911 const ObjCInterfaceDecl *Interface,
4912 const ObjCIvarDecl *Ivar) {
4913 uint64_t Offset = ComputeIvarBaseOffset(CGM, Interface, Ivar);
4914 return llvm::ConstantInt::get(
4915 CGM.getTypes().ConvertType(CGM.getContext().LongTy),
4919 /* *** Private Interface *** */
4921 std::string CGObjCCommonMac::GetSectionName(StringRef Section,
4922 StringRef MachOAttributes) {
4923 switch (CGM.getTriple().getObjectFormat()) {
4924 case llvm::Triple::UnknownObjectFormat:
4925 llvm_unreachable("unexpected object file format");
4926 case llvm::Triple::MachO: {
4927 if (MachOAttributes.empty())
4928 return ("__DATA," + Section).str();
4929 return ("__DATA," + Section + "," + MachOAttributes).str();
4931 case llvm::Triple::ELF:
4932 assert(Section.substr(0, 2) == "__" &&
4933 "expected the name to begin with __");
4934 return Section.substr(2).str();
4935 case llvm::Triple::COFF:
4936 assert(Section.substr(0, 2) == "__" &&
4937 "expected the name to begin with __");
4938 return ("." + Section.substr(2) + "$B").str();
4939 case llvm::Triple::Wasm:
4940 case llvm::Triple::XCOFF:
4941 llvm::report_fatal_error(
4942 "Objective-C support is unimplemented for object file format.");
4945 llvm_unreachable("Unhandled llvm::Triple::ObjectFormatType enum");
4948 /// EmitImageInfo - Emit the image info marker used to encode some module
4949 /// level information.
4951 /// See: <rdr://4810609&4810587&4810587>
4952 /// struct IMAGE_INFO {
4953 /// unsigned version;
4956 enum ImageInfoFlags {
4957 eImageInfo_FixAndContinue = (1 << 0), // This flag is no longer set by clang.
4958 eImageInfo_GarbageCollected = (1 << 1),
4959 eImageInfo_GCOnly = (1 << 2),
4960 eImageInfo_OptimizedByDyld = (1 << 3), // This flag is set by the dyld shared cache.
4962 // A flag indicating that the module has no instances of a @synthesize of a
4963 // superclass variable. <rdar://problem/6803242>
4964 eImageInfo_CorrectedSynthesize = (1 << 4), // This flag is no longer set by clang.
4965 eImageInfo_ImageIsSimulated = (1 << 5),
4966 eImageInfo_ClassProperties = (1 << 6)
4969 void CGObjCCommonMac::EmitImageInfo() {
4970 unsigned version = 0; // Version is unused?
4971 std::string Section =
4973 ? "__OBJC,__image_info,regular"
4974 : GetSectionName("__objc_imageinfo", "regular,no_dead_strip");
4976 // Generate module-level named metadata to convey this information to the
4977 // linker and code-gen.
4978 llvm::Module &Mod = CGM.getModule();
4980 // Add the ObjC ABI version to the module flags.
4981 Mod.addModuleFlag(llvm::Module::Error, "Objective-C Version", ObjCABI);
4982 Mod.addModuleFlag(llvm::Module::Error, "Objective-C Image Info Version",
4984 Mod.addModuleFlag(llvm::Module::Error, "Objective-C Image Info Section",
4985 llvm::MDString::get(VMContext, Section));
4987 if (CGM.getLangOpts().getGC() == LangOptions::NonGC) {
4988 // Non-GC overrides those files which specify GC.
4989 Mod.addModuleFlag(llvm::Module::Override,
4990 "Objective-C Garbage Collection", (uint32_t)0);
4992 // Add the ObjC garbage collection value.
4993 Mod.addModuleFlag(llvm::Module::Error,
4994 "Objective-C Garbage Collection",
4995 eImageInfo_GarbageCollected);
4997 if (CGM.getLangOpts().getGC() == LangOptions::GCOnly) {
4998 // Add the ObjC GC Only value.
4999 Mod.addModuleFlag(llvm::Module::Error, "Objective-C GC Only",
5002 // Require that GC be specified and set to eImageInfo_GarbageCollected.
5003 llvm::Metadata *Ops[2] = {
5004 llvm::MDString::get(VMContext, "Objective-C Garbage Collection"),
5005 llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
5006 llvm::Type::getInt32Ty(VMContext), eImageInfo_GarbageCollected))};
5007 Mod.addModuleFlag(llvm::Module::Require, "Objective-C GC Only",
5008 llvm::MDNode::get(VMContext, Ops));
5012 // Indicate whether we're compiling this to run on a simulator.
5013 if (CGM.getTarget().getTriple().isSimulatorEnvironment())
5014 Mod.addModuleFlag(llvm::Module::Error, "Objective-C Is Simulated",
5015 eImageInfo_ImageIsSimulated);
5017 // Indicate whether we are generating class properties.
5018 Mod.addModuleFlag(llvm::Module::Error, "Objective-C Class Properties",
5019 eImageInfo_ClassProperties);
5022 // struct objc_module {
5023 // unsigned long version;
5024 // unsigned long size;
5025 // const char *name;
5029 // FIXME: Get from somewhere
5030 static const int ModuleVersion = 7;
5032 void CGObjCMac::EmitModuleInfo() {
5033 uint64_t Size = CGM.getDataLayout().getTypeAllocSize(ObjCTypes.ModuleTy);
5035 ConstantInitBuilder builder(CGM);
5036 auto values = builder.beginStruct(ObjCTypes.ModuleTy);
5037 values.addInt(ObjCTypes.LongTy, ModuleVersion);
5038 values.addInt(ObjCTypes.LongTy, Size);
5039 // This used to be the filename, now it is unused. <rdr://4327263>
5040 values.add(GetClassName(StringRef("")));
5041 values.add(EmitModuleSymbols());
5042 CreateMetadataVar("OBJC_MODULES", values,
5043 "__OBJC,__module_info,regular,no_dead_strip",
5044 CGM.getPointerAlign(), true);
5047 llvm::Constant *CGObjCMac::EmitModuleSymbols() {
5048 unsigned NumClasses = DefinedClasses.size();
5049 unsigned NumCategories = DefinedCategories.size();
5051 // Return null if no symbols were defined.
5052 if (!NumClasses && !NumCategories)
5053 return llvm::Constant::getNullValue(ObjCTypes.SymtabPtrTy);
5055 ConstantInitBuilder builder(CGM);
5056 auto values = builder.beginStruct();
5057 values.addInt(ObjCTypes.LongTy, 0);
5058 values.addNullPointer(ObjCTypes.SelectorPtrTy);
5059 values.addInt(ObjCTypes.ShortTy, NumClasses);
5060 values.addInt(ObjCTypes.ShortTy, NumCategories);
5062 // The runtime expects exactly the list of defined classes followed
5063 // by the list of defined categories, in a single array.
5064 auto array = values.beginArray(ObjCTypes.Int8PtrTy);
5065 for (unsigned i=0; i<NumClasses; i++) {
5066 const ObjCInterfaceDecl *ID = ImplementedClasses[i];
5068 if (ObjCImplementationDecl *IMP = ID->getImplementation())
5069 // We are implementing a weak imported interface. Give it external linkage
5070 if (ID->isWeakImported() && !IMP->isWeakImported())
5071 DefinedClasses[i]->setLinkage(llvm::GlobalVariable::ExternalLinkage);
5073 array.addBitCast(DefinedClasses[i], ObjCTypes.Int8PtrTy);
5075 for (unsigned i=0; i<NumCategories; i++)
5076 array.addBitCast(DefinedCategories[i], ObjCTypes.Int8PtrTy);
5078 array.finishAndAddTo(values);
5080 llvm::GlobalVariable *GV = CreateMetadataVar(
5081 "OBJC_SYMBOLS", values, "__OBJC,__symbols,regular,no_dead_strip",
5082 CGM.getPointerAlign(), true);
5083 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.SymtabPtrTy);
5086 llvm::Value *CGObjCMac::EmitClassRefFromId(CodeGenFunction &CGF,
5087 IdentifierInfo *II) {
5088 LazySymbols.insert(II);
5090 llvm::GlobalVariable *&Entry = ClassReferences[II];
5093 llvm::Constant *Casted =
5094 llvm::ConstantExpr::getBitCast(GetClassName(II->getName()),
5095 ObjCTypes.ClassPtrTy);
5096 Entry = CreateMetadataVar(
5097 "OBJC_CLASS_REFERENCES_", Casted,
5098 "__OBJC,__cls_refs,literal_pointers,no_dead_strip",
5099 CGM.getPointerAlign(), true);
5102 return CGF.Builder.CreateAlignedLoad(Entry, CGF.getPointerAlign());
5105 llvm::Value *CGObjCMac::EmitClassRef(CodeGenFunction &CGF,
5106 const ObjCInterfaceDecl *ID) {
5107 // If the class has the objc_runtime_visible attribute, we need to
5108 // use the Objective-C runtime to get the class.
5109 if (ID->hasAttr<ObjCRuntimeVisibleAttr>())
5110 return EmitClassRefViaRuntime(CGF, ID, ObjCTypes);
5112 IdentifierInfo *RuntimeName =
5113 &CGM.getContext().Idents.get(ID->getObjCRuntimeNameAsString());
5114 return EmitClassRefFromId(CGF, RuntimeName);
5117 llvm::Value *CGObjCMac::EmitNSAutoreleasePoolClassRef(CodeGenFunction &CGF) {
5118 IdentifierInfo *II = &CGM.getContext().Idents.get("NSAutoreleasePool");
5119 return EmitClassRefFromId(CGF, II);
5122 llvm::Value *CGObjCMac::EmitSelector(CodeGenFunction &CGF, Selector Sel) {
5123 return CGF.Builder.CreateLoad(EmitSelectorAddr(CGF, Sel));
5126 Address CGObjCMac::EmitSelectorAddr(CodeGenFunction &CGF, Selector Sel) {
5127 CharUnits Align = CGF.getPointerAlign();
5129 llvm::GlobalVariable *&Entry = SelectorReferences[Sel];
5131 llvm::Constant *Casted =
5132 llvm::ConstantExpr::getBitCast(GetMethodVarName(Sel),
5133 ObjCTypes.SelectorPtrTy);
5134 Entry = CreateMetadataVar(
5135 "OBJC_SELECTOR_REFERENCES_", Casted,
5136 "__OBJC,__message_refs,literal_pointers,no_dead_strip", Align, true);
5137 Entry->setExternallyInitialized(true);
5140 return Address(Entry, Align);
5143 llvm::Constant *CGObjCCommonMac::GetClassName(StringRef RuntimeName) {
5144 llvm::GlobalVariable *&Entry = ClassNames[RuntimeName];
5146 Entry = CreateCStringLiteral(RuntimeName, ObjCLabelType::ClassName);
5147 return getConstantGEP(VMContext, Entry, 0, 0);
5150 llvm::Function *CGObjCCommonMac::GetMethodDefinition(const ObjCMethodDecl *MD) {
5151 llvm::DenseMap<const ObjCMethodDecl*, llvm::Function*>::iterator
5152 I = MethodDefinitions.find(MD);
5153 if (I != MethodDefinitions.end())
5159 /// GetIvarLayoutName - Returns a unique constant for the given
5160 /// ivar layout bitmap.
5161 llvm::Constant *CGObjCCommonMac::GetIvarLayoutName(IdentifierInfo *Ident,
5162 const ObjCCommonTypesHelper &ObjCTypes) {
5163 return llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy);
5166 void IvarLayoutBuilder::visitRecord(const RecordType *RT,
5168 const RecordDecl *RD = RT->getDecl();
5170 // If this is a union, remember that we had one, because it might mess
5171 // up the ordering of layout entries.
5173 IsDisordered = true;
5175 const ASTRecordLayout *recLayout = nullptr;
5176 visitAggregate(RD->field_begin(), RD->field_end(), offset,
5177 [&](const FieldDecl *field) -> CharUnits {
5179 recLayout = &CGM.getContext().getASTRecordLayout(RD);
5180 auto offsetInBits = recLayout->getFieldOffset(field->getFieldIndex());
5181 return CGM.getContext().toCharUnitsFromBits(offsetInBits);
5185 template <class Iterator, class GetOffsetFn>
5186 void IvarLayoutBuilder::visitAggregate(Iterator begin, Iterator end,
5187 CharUnits aggregateOffset,
5188 const GetOffsetFn &getOffset) {
5189 for (; begin != end; ++begin) {
5190 auto field = *begin;
5192 // Skip over bitfields.
5193 if (field->isBitField()) {
5197 // Compute the offset of the field within the aggregate.
5198 CharUnits fieldOffset = aggregateOffset + getOffset(field);
5200 visitField(field, fieldOffset);
5204 /// Collect layout information for the given fields into IvarsInfo.
5205 void IvarLayoutBuilder::visitField(const FieldDecl *field,
5206 CharUnits fieldOffset) {
5207 QualType fieldType = field->getType();
5209 // Drill down into arrays.
5210 uint64_t numElts = 1;
5211 if (auto arrayType = CGM.getContext().getAsIncompleteArrayType(fieldType)) {
5213 fieldType = arrayType->getElementType();
5215 // Unlike incomplete arrays, constant arrays can be nested.
5216 while (auto arrayType = CGM.getContext().getAsConstantArrayType(fieldType)) {
5217 numElts *= arrayType->getSize().getZExtValue();
5218 fieldType = arrayType->getElementType();
5221 assert(!fieldType->isArrayType() && "ivar of non-constant array type?");
5223 // If we ended up with a zero-sized array, we've done what we can do within
5224 // the limits of this layout encoding.
5225 if (numElts == 0) return;
5227 // Recurse if the base element type is a record type.
5228 if (auto recType = fieldType->getAs<RecordType>()) {
5229 size_t oldEnd = IvarsInfo.size();
5231 visitRecord(recType, fieldOffset);
5233 // If we have an array, replicate the first entry's layout information.
5234 auto numEltEntries = IvarsInfo.size() - oldEnd;
5235 if (numElts != 1 && numEltEntries != 0) {
5236 CharUnits eltSize = CGM.getContext().getTypeSizeInChars(recType);
5237 for (uint64_t eltIndex = 1; eltIndex != numElts; ++eltIndex) {
5238 // Copy the last numEltEntries onto the end of the array, adjusting
5239 // each for the element size.
5240 for (size_t i = 0; i != numEltEntries; ++i) {
5241 auto firstEntry = IvarsInfo[oldEnd + i];
5242 IvarsInfo.push_back(IvarInfo(firstEntry.Offset + eltIndex * eltSize,
5243 firstEntry.SizeInWords));
5251 // Classify the element type.
5252 Qualifiers::GC GCAttr = GetGCAttrTypeForType(CGM.getContext(), fieldType);
5254 // If it matches what we're looking for, add an entry.
5255 if ((ForStrongLayout && GCAttr == Qualifiers::Strong)
5256 || (!ForStrongLayout && GCAttr == Qualifiers::Weak)) {
5257 assert(CGM.getContext().getTypeSizeInChars(fieldType)
5258 == CGM.getPointerSize());
5259 IvarsInfo.push_back(IvarInfo(fieldOffset, numElts));
5263 /// buildBitmap - This routine does the horsework of taking the offsets of
5264 /// strong/weak references and creating a bitmap. The bitmap is also
5265 /// returned in the given buffer, suitable for being passed to \c dump().
5266 llvm::Constant *IvarLayoutBuilder::buildBitmap(CGObjCCommonMac &CGObjC,
5267 llvm::SmallVectorImpl<unsigned char> &buffer) {
5268 // The bitmap is a series of skip/scan instructions, aligned to word
5269 // boundaries. The skip is performed first.
5270 const unsigned char MaxNibble = 0xF;
5271 const unsigned char SkipMask = 0xF0, SkipShift = 4;
5272 const unsigned char ScanMask = 0x0F, ScanShift = 0;
5274 assert(!IvarsInfo.empty() && "generating bitmap for no data");
5276 // Sort the ivar info on byte position in case we encounterred a
5277 // union nested in the ivar list.
5279 // This isn't a stable sort, but our algorithm should handle it fine.
5280 llvm::array_pod_sort(IvarsInfo.begin(), IvarsInfo.end());
5282 assert(std::is_sorted(IvarsInfo.begin(), IvarsInfo.end()));
5284 assert(IvarsInfo.back().Offset < InstanceEnd);
5286 assert(buffer.empty());
5288 // Skip the next N words.
5289 auto skip = [&](unsigned numWords) {
5290 assert(numWords > 0);
5292 // Try to merge into the previous byte. Since scans happen second, we
5293 // can't do this if it includes a scan.
5294 if (!buffer.empty() && !(buffer.back() & ScanMask)) {
5295 unsigned lastSkip = buffer.back() >> SkipShift;
5296 if (lastSkip < MaxNibble) {
5297 unsigned claimed = std::min(MaxNibble - lastSkip, numWords);
5298 numWords -= claimed;
5299 lastSkip += claimed;
5300 buffer.back() = (lastSkip << SkipShift);
5304 while (numWords >= MaxNibble) {
5305 buffer.push_back(MaxNibble << SkipShift);
5306 numWords -= MaxNibble;
5309 buffer.push_back(numWords << SkipShift);
5313 // Scan the next N words.
5314 auto scan = [&](unsigned numWords) {
5315 assert(numWords > 0);
5317 // Try to merge into the previous byte. Since scans happen second, we can
5318 // do this even if it includes a skip.
5319 if (!buffer.empty()) {
5320 unsigned lastScan = (buffer.back() & ScanMask) >> ScanShift;
5321 if (lastScan < MaxNibble) {
5322 unsigned claimed = std::min(MaxNibble - lastScan, numWords);
5323 numWords -= claimed;
5324 lastScan += claimed;
5325 buffer.back() = (buffer.back() & SkipMask) | (lastScan << ScanShift);
5329 while (numWords >= MaxNibble) {
5330 buffer.push_back(MaxNibble << ScanShift);
5331 numWords -= MaxNibble;
5334 buffer.push_back(numWords << ScanShift);
5338 // One past the end of the last scan.
5339 unsigned endOfLastScanInWords = 0;
5340 const CharUnits WordSize = CGM.getPointerSize();
5342 // Consider all the scan requests.
5343 for (auto &request : IvarsInfo) {
5344 CharUnits beginOfScan = request.Offset - InstanceBegin;
5346 // Ignore scan requests that don't start at an even multiple of the
5347 // word size. We can't encode them.
5348 if ((beginOfScan % WordSize) != 0) continue;
5350 // Ignore scan requests that start before the instance start.
5351 // This assumes that scans never span that boundary. The boundary
5352 // isn't the true start of the ivars, because in the fragile-ARC case
5353 // it's rounded up to word alignment, but the test above should leave
5354 // us ignoring that possibility.
5355 if (beginOfScan.isNegative()) {
5356 assert(request.Offset + request.SizeInWords * WordSize <= InstanceBegin);
5360 unsigned beginOfScanInWords = beginOfScan / WordSize;
5361 unsigned endOfScanInWords = beginOfScanInWords + request.SizeInWords;
5363 // If the scan starts some number of words after the last one ended,
5365 if (beginOfScanInWords > endOfLastScanInWords) {
5366 skip(beginOfScanInWords - endOfLastScanInWords);
5368 // Otherwise, start scanning where the last left off.
5370 beginOfScanInWords = endOfLastScanInWords;
5372 // If that leaves us with nothing to scan, ignore this request.
5373 if (beginOfScanInWords >= endOfScanInWords) continue;
5376 // Scan to the end of the request.
5377 assert(beginOfScanInWords < endOfScanInWords);
5378 scan(endOfScanInWords - beginOfScanInWords);
5379 endOfLastScanInWords = endOfScanInWords;
5383 return llvm::ConstantPointerNull::get(CGM.Int8PtrTy);
5385 // For GC layouts, emit a skip to the end of the allocation so that we
5386 // have precise information about the entire thing. This isn't useful
5387 // or necessary for the ARC-style layout strings.
5388 if (CGM.getLangOpts().getGC() != LangOptions::NonGC) {
5389 unsigned lastOffsetInWords =
5390 (InstanceEnd - InstanceBegin + WordSize - CharUnits::One()) / WordSize;
5391 if (lastOffsetInWords > endOfLastScanInWords) {
5392 skip(lastOffsetInWords - endOfLastScanInWords);
5396 // Null terminate the string.
5397 buffer.push_back(0);
5399 auto *Entry = CGObjC.CreateCStringLiteral(
5400 reinterpret_cast<char *>(buffer.data()), ObjCLabelType::ClassName);
5401 return getConstantGEP(CGM.getLLVMContext(), Entry, 0, 0);
5404 /// BuildIvarLayout - Builds ivar layout bitmap for the class
5405 /// implementation for the __strong or __weak case.
5406 /// The layout map displays which words in ivar list must be skipped
5407 /// and which must be scanned by GC (see below). String is built of bytes.
5408 /// Each byte is divided up in two nibbles (4-bit each). Left nibble is count
5409 /// of words to skip and right nibble is count of words to scan. So, each
5410 /// nibble represents up to 15 workds to skip or scan. Skipping the rest is
5411 /// represented by a 0x00 byte which also ends the string.
5412 /// 1. when ForStrongLayout is true, following ivars are scanned:
5415 /// - __strong anything
5417 /// 2. When ForStrongLayout is false, following ivars are scanned:
5418 /// - __weak anything
5421 CGObjCCommonMac::BuildIvarLayout(const ObjCImplementationDecl *OMD,
5422 CharUnits beginOffset, CharUnits endOffset,
5423 bool ForStrongLayout, bool HasMRCWeakIvars) {
5424 // If this is MRC, and we're either building a strong layout or there
5425 // are no weak ivars, bail out early.
5426 llvm::Type *PtrTy = CGM.Int8PtrTy;
5427 if (CGM.getLangOpts().getGC() == LangOptions::NonGC &&
5428 !CGM.getLangOpts().ObjCAutoRefCount &&
5429 (ForStrongLayout || !HasMRCWeakIvars))
5430 return llvm::Constant::getNullValue(PtrTy);
5432 const ObjCInterfaceDecl *OI = OMD->getClassInterface();
5433 SmallVector<const ObjCIvarDecl*, 32> ivars;
5435 // GC layout strings include the complete object layout, possibly
5436 // inaccurately in the non-fragile ABI; the runtime knows how to fix this
5439 // ARC layout strings only include the class's ivars. In non-fragile
5440 // runtimes, that means starting at InstanceStart, rounded up to word
5441 // alignment. In fragile runtimes, there's no InstanceStart, so it means
5442 // starting at the offset of the first ivar, rounded up to word alignment.
5444 // MRC weak layout strings follow the ARC style.
5445 CharUnits baseOffset;
5446 if (CGM.getLangOpts().getGC() == LangOptions::NonGC) {
5447 for (const ObjCIvarDecl *IVD = OI->all_declared_ivar_begin();
5448 IVD; IVD = IVD->getNextIvar())
5449 ivars.push_back(IVD);
5451 if (isNonFragileABI()) {
5452 baseOffset = beginOffset; // InstanceStart
5453 } else if (!ivars.empty()) {
5455 CharUnits::fromQuantity(ComputeIvarBaseOffset(CGM, OMD, ivars[0]));
5457 baseOffset = CharUnits::Zero();
5460 baseOffset = baseOffset.alignTo(CGM.getPointerAlign());
5463 CGM.getContext().DeepCollectObjCIvars(OI, true, ivars);
5465 baseOffset = CharUnits::Zero();
5469 return llvm::Constant::getNullValue(PtrTy);
5471 IvarLayoutBuilder builder(CGM, baseOffset, endOffset, ForStrongLayout);
5473 builder.visitAggregate(ivars.begin(), ivars.end(), CharUnits::Zero(),
5474 [&](const ObjCIvarDecl *ivar) -> CharUnits {
5475 return CharUnits::fromQuantity(ComputeIvarBaseOffset(CGM, OMD, ivar));
5478 if (!builder.hasBitmapData())
5479 return llvm::Constant::getNullValue(PtrTy);
5481 llvm::SmallVector<unsigned char, 4> buffer;
5482 llvm::Constant *C = builder.buildBitmap(*this, buffer);
5484 if (CGM.getLangOpts().ObjCGCBitmapPrint && !buffer.empty()) {
5485 printf("\n%s ivar layout for class '%s': ",
5486 ForStrongLayout ? "strong" : "weak",
5487 OMD->getClassInterface()->getName().str().c_str());
5488 builder.dump(buffer);
5493 llvm::Constant *CGObjCCommonMac::GetMethodVarName(Selector Sel) {
5494 llvm::GlobalVariable *&Entry = MethodVarNames[Sel];
5495 // FIXME: Avoid std::string in "Sel.getAsString()"
5497 Entry = CreateCStringLiteral(Sel.getAsString(), ObjCLabelType::MethodVarName);
5498 return getConstantGEP(VMContext, Entry, 0, 0);
5501 // FIXME: Merge into a single cstring creation function.
5502 llvm::Constant *CGObjCCommonMac::GetMethodVarName(IdentifierInfo *ID) {
5503 return GetMethodVarName(CGM.getContext().Selectors.getNullarySelector(ID));
5506 llvm::Constant *CGObjCCommonMac::GetMethodVarType(const FieldDecl *Field) {
5507 std::string TypeStr;
5508 CGM.getContext().getObjCEncodingForType(Field->getType(), TypeStr, Field);
5510 llvm::GlobalVariable *&Entry = MethodVarTypes[TypeStr];
5512 Entry = CreateCStringLiteral(TypeStr, ObjCLabelType::MethodVarType);
5513 return getConstantGEP(VMContext, Entry, 0, 0);
5516 llvm::Constant *CGObjCCommonMac::GetMethodVarType(const ObjCMethodDecl *D,
5518 std::string TypeStr =
5519 CGM.getContext().getObjCEncodingForMethodDecl(D, Extended);
5521 llvm::GlobalVariable *&Entry = MethodVarTypes[TypeStr];
5523 Entry = CreateCStringLiteral(TypeStr, ObjCLabelType::MethodVarType);
5524 return getConstantGEP(VMContext, Entry, 0, 0);
5527 // FIXME: Merge into a single cstring creation function.
5528 llvm::Constant *CGObjCCommonMac::GetPropertyName(IdentifierInfo *Ident) {
5529 llvm::GlobalVariable *&Entry = PropertyNames[Ident];
5531 Entry = CreateCStringLiteral(Ident->getName(), ObjCLabelType::PropertyName);
5532 return getConstantGEP(VMContext, Entry, 0, 0);
5535 // FIXME: Merge into a single cstring creation function.
5536 // FIXME: This Decl should be more precise.
5538 CGObjCCommonMac::GetPropertyTypeString(const ObjCPropertyDecl *PD,
5539 const Decl *Container) {
5540 std::string TypeStr =
5541 CGM.getContext().getObjCEncodingForPropertyDecl(PD, Container);
5542 return GetPropertyName(&CGM.getContext().Idents.get(TypeStr));
5545 void CGObjCCommonMac::GetNameForMethod(const ObjCMethodDecl *D,
5546 const ObjCContainerDecl *CD,
5547 SmallVectorImpl<char> &Name) {
5548 llvm::raw_svector_ostream OS(Name);
5549 assert (CD && "Missing container decl in GetNameForMethod");
5550 OS << '\01' << (D->isInstanceMethod() ? '-' : '+')
5551 << '[' << CD->getName();
5552 if (const ObjCCategoryImplDecl *CID =
5553 dyn_cast<ObjCCategoryImplDecl>(D->getDeclContext()))
5554 OS << '(' << *CID << ')';
5555 OS << ' ' << D->getSelector().getAsString() << ']';
5558 void CGObjCMac::FinishModule() {
5561 // Emit the dummy bodies for any protocols which were referenced but
5563 for (auto &entry : Protocols) {
5564 llvm::GlobalVariable *global = entry.second;
5565 if (global->hasInitializer())
5568 ConstantInitBuilder builder(CGM);
5569 auto values = builder.beginStruct(ObjCTypes.ProtocolTy);
5570 values.addNullPointer(ObjCTypes.ProtocolExtensionPtrTy);
5571 values.add(GetClassName(entry.first->getName()));
5572 values.addNullPointer(ObjCTypes.ProtocolListPtrTy);
5573 values.addNullPointer(ObjCTypes.MethodDescriptionListPtrTy);
5574 values.addNullPointer(ObjCTypes.MethodDescriptionListPtrTy);
5575 values.finishAndSetAsInitializer(global);
5576 CGM.addCompilerUsedGlobal(global);
5579 // Add assembler directives to add lazy undefined symbol references
5580 // for classes which are referenced but not defined. This is
5581 // important for correct linker interaction.
5583 // FIXME: It would be nice if we had an LLVM construct for this.
5584 if ((!LazySymbols.empty() || !DefinedSymbols.empty()) &&
5585 CGM.getTriple().isOSBinFormatMachO()) {
5586 SmallString<256> Asm;
5587 Asm += CGM.getModule().getModuleInlineAsm();
5588 if (!Asm.empty() && Asm.back() != '\n')
5591 llvm::raw_svector_ostream OS(Asm);
5592 for (const auto *Sym : DefinedSymbols)
5593 OS << "\t.objc_class_name_" << Sym->getName() << "=0\n"
5594 << "\t.globl .objc_class_name_" << Sym->getName() << "\n";
5595 for (const auto *Sym : LazySymbols)
5596 OS << "\t.lazy_reference .objc_class_name_" << Sym->getName() << "\n";
5597 for (const auto &Category : DefinedCategoryNames)
5598 OS << "\t.objc_category_name_" << Category << "=0\n"
5599 << "\t.globl .objc_category_name_" << Category << "\n";
5601 CGM.getModule().setModuleInlineAsm(OS.str());
5605 CGObjCNonFragileABIMac::CGObjCNonFragileABIMac(CodeGen::CodeGenModule &cgm)
5606 : CGObjCCommonMac(cgm), ObjCTypes(cgm), ObjCEmptyCacheVar(nullptr),
5607 ObjCEmptyVtableVar(nullptr) {
5613 ObjCCommonTypesHelper::ObjCCommonTypesHelper(CodeGen::CodeGenModule &cgm)
5614 : VMContext(cgm.getLLVMContext()), CGM(cgm), ExternalProtocolPtrTy(nullptr)
5616 CodeGen::CodeGenTypes &Types = CGM.getTypes();
5617 ASTContext &Ctx = CGM.getContext();
5619 ShortTy = cast<llvm::IntegerType>(Types.ConvertType(Ctx.ShortTy));
5621 LongTy = cast<llvm::IntegerType>(Types.ConvertType(Ctx.LongTy));
5622 Int8PtrTy = CGM.Int8PtrTy;
5623 Int8PtrPtrTy = CGM.Int8PtrPtrTy;
5625 // arm64 targets use "int" ivar offset variables. All others,
5626 // including OS X x86_64 and Windows x86_64, use "long" ivar offsets.
5627 if (CGM.getTarget().getTriple().getArch() == llvm::Triple::aarch64)
5628 IvarOffsetVarTy = IntTy;
5630 IvarOffsetVarTy = LongTy;
5633 cast<llvm::PointerType>(Types.ConvertType(Ctx.getObjCIdType()));
5635 llvm::PointerType::getUnqual(ObjectPtrTy);
5637 cast<llvm::PointerType>(Types.ConvertType(Ctx.getObjCSelType()));
5639 // I'm not sure I like this. The implicit coordination is a bit
5640 // gross. We should solve this in a reasonable fashion because this
5641 // is a pretty common task (match some runtime data structure with
5642 // an LLVM data structure).
5644 // FIXME: This is leaked.
5645 // FIXME: Merge with rewriter code?
5647 // struct _objc_super {
5651 RecordDecl *RD = RecordDecl::Create(Ctx, TTK_Struct,
5652 Ctx.getTranslationUnitDecl(),
5653 SourceLocation(), SourceLocation(),
5654 &Ctx.Idents.get("_objc_super"));
5655 RD->addDecl(FieldDecl::Create(Ctx, RD, SourceLocation(), SourceLocation(),
5656 nullptr, Ctx.getObjCIdType(), nullptr, nullptr,
5657 false, ICIS_NoInit));
5658 RD->addDecl(FieldDecl::Create(Ctx, RD, SourceLocation(), SourceLocation(),
5659 nullptr, Ctx.getObjCClassType(), nullptr,
5660 nullptr, false, ICIS_NoInit));
5661 RD->completeDefinition();
5663 SuperCTy = Ctx.getTagDeclType(RD);
5664 SuperPtrCTy = Ctx.getPointerType(SuperCTy);
5666 SuperTy = cast<llvm::StructType>(Types.ConvertType(SuperCTy));
5667 SuperPtrTy = llvm::PointerType::getUnqual(SuperTy);
5671 // char *attributes;
5673 PropertyTy = llvm::StructType::create("struct._prop_t", Int8PtrTy, Int8PtrTy);
5675 // struct _prop_list_t {
5676 // uint32_t entsize; // sizeof(struct _prop_t)
5677 // uint32_t count_of_properties;
5678 // struct _prop_t prop_list[count_of_properties];
5680 PropertyListTy = llvm::StructType::create(
5681 "struct._prop_list_t", IntTy, IntTy, llvm::ArrayType::get(PropertyTy, 0));
5682 // struct _prop_list_t *
5683 PropertyListPtrTy = llvm::PointerType::getUnqual(PropertyListTy);
5685 // struct _objc_method {
5687 // char *method_type;
5690 MethodTy = llvm::StructType::create("struct._objc_method", SelectorPtrTy,
5691 Int8PtrTy, Int8PtrTy);
5693 // struct _objc_cache *
5694 CacheTy = llvm::StructType::create(VMContext, "struct._objc_cache");
5695 CachePtrTy = llvm::PointerType::getUnqual(CacheTy);
5698 ObjCTypesHelper::ObjCTypesHelper(CodeGen::CodeGenModule &cgm)
5699 : ObjCCommonTypesHelper(cgm) {
5700 // struct _objc_method_description {
5704 MethodDescriptionTy = llvm::StructType::create(
5705 "struct._objc_method_description", SelectorPtrTy, Int8PtrTy);
5707 // struct _objc_method_description_list {
5709 // struct _objc_method_description[1];
5711 MethodDescriptionListTy =
5712 llvm::StructType::create("struct._objc_method_description_list", IntTy,
5713 llvm::ArrayType::get(MethodDescriptionTy, 0));
5715 // struct _objc_method_description_list *
5716 MethodDescriptionListPtrTy =
5717 llvm::PointerType::getUnqual(MethodDescriptionListTy);
5719 // Protocol description structures
5721 // struct _objc_protocol_extension {
5722 // uint32_t size; // sizeof(struct _objc_protocol_extension)
5723 // struct _objc_method_description_list *optional_instance_methods;
5724 // struct _objc_method_description_list *optional_class_methods;
5725 // struct _objc_property_list *instance_properties;
5726 // const char ** extendedMethodTypes;
5727 // struct _objc_property_list *class_properties;
5729 ProtocolExtensionTy = llvm::StructType::create(
5730 "struct._objc_protocol_extension", IntTy, MethodDescriptionListPtrTy,
5731 MethodDescriptionListPtrTy, PropertyListPtrTy, Int8PtrPtrTy,
5734 // struct _objc_protocol_extension *
5735 ProtocolExtensionPtrTy = llvm::PointerType::getUnqual(ProtocolExtensionTy);
5737 // Handle recursive construction of Protocol and ProtocolList types
5740 llvm::StructType::create(VMContext, "struct._objc_protocol");
5743 llvm::StructType::create(VMContext, "struct._objc_protocol_list");
5744 ProtocolListTy->setBody(llvm::PointerType::getUnqual(ProtocolListTy), LongTy,
5745 llvm::ArrayType::get(ProtocolTy, 0));
5747 // struct _objc_protocol {
5748 // struct _objc_protocol_extension *isa;
5749 // char *protocol_name;
5750 // struct _objc_protocol **_objc_protocol_list;
5751 // struct _objc_method_description_list *instance_methods;
5752 // struct _objc_method_description_list *class_methods;
5754 ProtocolTy->setBody(ProtocolExtensionPtrTy, Int8PtrTy,
5755 llvm::PointerType::getUnqual(ProtocolListTy),
5756 MethodDescriptionListPtrTy, MethodDescriptionListPtrTy);
5758 // struct _objc_protocol_list *
5759 ProtocolListPtrTy = llvm::PointerType::getUnqual(ProtocolListTy);
5761 ProtocolPtrTy = llvm::PointerType::getUnqual(ProtocolTy);
5763 // Class description structures
5765 // struct _objc_ivar {
5770 IvarTy = llvm::StructType::create("struct._objc_ivar", Int8PtrTy, Int8PtrTy,
5773 // struct _objc_ivar_list *
5775 llvm::StructType::create(VMContext, "struct._objc_ivar_list");
5776 IvarListPtrTy = llvm::PointerType::getUnqual(IvarListTy);
5778 // struct _objc_method_list *
5780 llvm::StructType::create(VMContext, "struct._objc_method_list");
5781 MethodListPtrTy = llvm::PointerType::getUnqual(MethodListTy);
5783 // struct _objc_class_extension *
5784 ClassExtensionTy = llvm::StructType::create(
5785 "struct._objc_class_extension", IntTy, Int8PtrTy, PropertyListPtrTy);
5786 ClassExtensionPtrTy = llvm::PointerType::getUnqual(ClassExtensionTy);
5788 ClassTy = llvm::StructType::create(VMContext, "struct._objc_class");
5790 // struct _objc_class {
5792 // Class super_class;
5796 // long instance_size;
5797 // struct _objc_ivar_list *ivars;
5798 // struct _objc_method_list *methods;
5799 // struct _objc_cache *cache;
5800 // struct _objc_protocol_list *protocols;
5801 // char *ivar_layout;
5802 // struct _objc_class_ext *ext;
5804 ClassTy->setBody(llvm::PointerType::getUnqual(ClassTy),
5805 llvm::PointerType::getUnqual(ClassTy), Int8PtrTy, LongTy,
5806 LongTy, LongTy, IvarListPtrTy, MethodListPtrTy, CachePtrTy,
5807 ProtocolListPtrTy, Int8PtrTy, ClassExtensionPtrTy);
5809 ClassPtrTy = llvm::PointerType::getUnqual(ClassTy);
5811 // struct _objc_category {
5812 // char *category_name;
5813 // char *class_name;
5814 // struct _objc_method_list *instance_method;
5815 // struct _objc_method_list *class_method;
5816 // struct _objc_protocol_list *protocols;
5817 // uint32_t size; // sizeof(struct _objc_category)
5818 // struct _objc_property_list *instance_properties;// category's @property
5819 // struct _objc_property_list *class_properties;
5821 CategoryTy = llvm::StructType::create(
5822 "struct._objc_category", Int8PtrTy, Int8PtrTy, MethodListPtrTy,
5823 MethodListPtrTy, ProtocolListPtrTy, IntTy, PropertyListPtrTy,
5826 // Global metadata structures
5828 // struct _objc_symtab {
5829 // long sel_ref_cnt;
5831 // short cls_def_cnt;
5832 // short cat_def_cnt;
5833 // char *defs[cls_def_cnt + cat_def_cnt];
5835 SymtabTy = llvm::StructType::create("struct._objc_symtab", LongTy,
5836 SelectorPtrTy, ShortTy, ShortTy,
5837 llvm::ArrayType::get(Int8PtrTy, 0));
5838 SymtabPtrTy = llvm::PointerType::getUnqual(SymtabTy);
5840 // struct _objc_module {
5842 // long size; // sizeof(struct _objc_module)
5844 // struct _objc_symtab* symtab;
5846 ModuleTy = llvm::StructType::create("struct._objc_module", LongTy, LongTy,
5847 Int8PtrTy, SymtabPtrTy);
5849 // FIXME: This is the size of the setjmp buffer and should be target
5850 // specific. 18 is what's used on 32-bit X86.
5851 uint64_t SetJmpBufferSize = 18;
5854 llvm::Type *StackPtrTy = llvm::ArrayType::get(CGM.Int8PtrTy, 4);
5856 ExceptionDataTy = llvm::StructType::create(
5857 "struct._objc_exception_data",
5858 llvm::ArrayType::get(CGM.Int32Ty, SetJmpBufferSize), StackPtrTy);
5861 ObjCNonFragileABITypesHelper::ObjCNonFragileABITypesHelper(CodeGen::CodeGenModule &cgm)
5862 : ObjCCommonTypesHelper(cgm) {
5863 // struct _method_list_t {
5864 // uint32_t entsize; // sizeof(struct _objc_method)
5865 // uint32_t method_count;
5866 // struct _objc_method method_list[method_count];
5869 llvm::StructType::create("struct.__method_list_t", IntTy, IntTy,
5870 llvm::ArrayType::get(MethodTy, 0));
5871 // struct method_list_t *
5872 MethodListnfABIPtrTy = llvm::PointerType::getUnqual(MethodListnfABITy);
5874 // struct _protocol_t {
5876 // const char * const protocol_name;
5877 // const struct _protocol_list_t * protocol_list; // super protocols
5878 // const struct method_list_t * const instance_methods;
5879 // const struct method_list_t * const class_methods;
5880 // const struct method_list_t *optionalInstanceMethods;
5881 // const struct method_list_t *optionalClassMethods;
5882 // const struct _prop_list_t * properties;
5883 // const uint32_t size; // sizeof(struct _protocol_t)
5884 // const uint32_t flags; // = 0
5885 // const char ** extendedMethodTypes;
5886 // const char *demangledName;
5887 // const struct _prop_list_t * class_properties;
5890 // Holder for struct _protocol_list_t *
5891 ProtocolListnfABITy =
5892 llvm::StructType::create(VMContext, "struct._objc_protocol_list");
5894 ProtocolnfABITy = llvm::StructType::create(
5895 "struct._protocol_t", ObjectPtrTy, Int8PtrTy,
5896 llvm::PointerType::getUnqual(ProtocolListnfABITy), MethodListnfABIPtrTy,
5897 MethodListnfABIPtrTy, MethodListnfABIPtrTy, MethodListnfABIPtrTy,
5898 PropertyListPtrTy, IntTy, IntTy, Int8PtrPtrTy, Int8PtrTy,
5901 // struct _protocol_t*
5902 ProtocolnfABIPtrTy = llvm::PointerType::getUnqual(ProtocolnfABITy);
5904 // struct _protocol_list_t {
5905 // long protocol_count; // Note, this is 32/64 bit
5906 // struct _protocol_t *[protocol_count];
5908 ProtocolListnfABITy->setBody(LongTy,
5909 llvm::ArrayType::get(ProtocolnfABIPtrTy, 0));
5911 // struct _objc_protocol_list*
5912 ProtocolListnfABIPtrTy = llvm::PointerType::getUnqual(ProtocolListnfABITy);
5915 // unsigned [long] int *offset; // pointer to ivar offset location
5918 // uint32_t alignment;
5921 IvarnfABITy = llvm::StructType::create(
5922 "struct._ivar_t", llvm::PointerType::getUnqual(IvarOffsetVarTy),
5923 Int8PtrTy, Int8PtrTy, IntTy, IntTy);
5925 // struct _ivar_list_t {
5926 // uint32 entsize; // sizeof(struct _ivar_t)
5928 // struct _iver_t list[count];
5931 llvm::StructType::create("struct._ivar_list_t", IntTy, IntTy,
5932 llvm::ArrayType::get(IvarnfABITy, 0));
5934 IvarListnfABIPtrTy = llvm::PointerType::getUnqual(IvarListnfABITy);
5936 // struct _class_ro_t {
5937 // uint32_t const flags;
5938 // uint32_t const instanceStart;
5939 // uint32_t const instanceSize;
5940 // uint32_t const reserved; // only when building for 64bit targets
5941 // const uint8_t * const ivarLayout;
5942 // const char *const name;
5943 // const struct _method_list_t * const baseMethods;
5944 // const struct _objc_protocol_list *const baseProtocols;
5945 // const struct _ivar_list_t *const ivars;
5946 // const uint8_t * const weakIvarLayout;
5947 // const struct _prop_list_t * const properties;
5950 // FIXME. Add 'reserved' field in 64bit abi mode!
5951 ClassRonfABITy = llvm::StructType::create(
5952 "struct._class_ro_t", IntTy, IntTy, IntTy, Int8PtrTy, Int8PtrTy,
5953 MethodListnfABIPtrTy, ProtocolListnfABIPtrTy, IvarListnfABIPtrTy,
5954 Int8PtrTy, PropertyListPtrTy);
5956 // ImpnfABITy - LLVM for id (*)(id, SEL, ...)
5957 llvm::Type *params[] = { ObjectPtrTy, SelectorPtrTy };
5958 ImpnfABITy = llvm::FunctionType::get(ObjectPtrTy, params, false)
5961 // struct _class_t {
5962 // struct _class_t *isa;
5963 // struct _class_t * const superclass;
5966 // struct class_ro_t *ro;
5969 ClassnfABITy = llvm::StructType::create(VMContext, "struct._class_t");
5970 ClassnfABITy->setBody(llvm::PointerType::getUnqual(ClassnfABITy),
5971 llvm::PointerType::getUnqual(ClassnfABITy), CachePtrTy,
5972 llvm::PointerType::getUnqual(ImpnfABITy),
5973 llvm::PointerType::getUnqual(ClassRonfABITy));
5975 // LLVM for struct _class_t *
5976 ClassnfABIPtrTy = llvm::PointerType::getUnqual(ClassnfABITy);
5978 // struct _category_t {
5979 // const char * const name;
5980 // struct _class_t *const cls;
5981 // const struct _method_list_t * const instance_methods;
5982 // const struct _method_list_t * const class_methods;
5983 // const struct _protocol_list_t * const protocols;
5984 // const struct _prop_list_t * const properties;
5985 // const struct _prop_list_t * const class_properties;
5986 // const uint32_t size;
5988 CategorynfABITy = llvm::StructType::create(
5989 "struct._category_t", Int8PtrTy, ClassnfABIPtrTy, MethodListnfABIPtrTy,
5990 MethodListnfABIPtrTy, ProtocolListnfABIPtrTy, PropertyListPtrTy,
5991 PropertyListPtrTy, IntTy);
5993 // New types for nonfragile abi messaging.
5994 CodeGen::CodeGenTypes &Types = CGM.getTypes();
5995 ASTContext &Ctx = CGM.getContext();
5997 // MessageRefTy - LLVM for:
5998 // struct _message_ref_t {
6003 // First the clang type for struct _message_ref_t
6004 RecordDecl *RD = RecordDecl::Create(Ctx, TTK_Struct,
6005 Ctx.getTranslationUnitDecl(),
6006 SourceLocation(), SourceLocation(),
6007 &Ctx.Idents.get("_message_ref_t"));
6008 RD->addDecl(FieldDecl::Create(Ctx, RD, SourceLocation(), SourceLocation(),
6009 nullptr, Ctx.VoidPtrTy, nullptr, nullptr, false,
6011 RD->addDecl(FieldDecl::Create(Ctx, RD, SourceLocation(), SourceLocation(),
6012 nullptr, Ctx.getObjCSelType(), nullptr, nullptr,
6013 false, ICIS_NoInit));
6014 RD->completeDefinition();
6016 MessageRefCTy = Ctx.getTagDeclType(RD);
6017 MessageRefCPtrTy = Ctx.getPointerType(MessageRefCTy);
6018 MessageRefTy = cast<llvm::StructType>(Types.ConvertType(MessageRefCTy));
6020 // MessageRefPtrTy - LLVM for struct _message_ref_t*
6021 MessageRefPtrTy = llvm::PointerType::getUnqual(MessageRefTy);
6023 // SuperMessageRefTy - LLVM for:
6024 // struct _super_message_ref_t {
6025 // SUPER_IMP messenger;
6028 SuperMessageRefTy = llvm::StructType::create("struct._super_message_ref_t",
6029 ImpnfABITy, SelectorPtrTy);
6031 // SuperMessageRefPtrTy - LLVM for struct _super_message_ref_t*
6032 SuperMessageRefPtrTy = llvm::PointerType::getUnqual(SuperMessageRefTy);
6035 // struct objc_typeinfo {
6036 // const void** vtable; // objc_ehtype_vtable + 2
6037 // const char* name; // c++ typeinfo string
6040 EHTypeTy = llvm::StructType::create("struct._objc_typeinfo",
6041 llvm::PointerType::getUnqual(Int8PtrTy),
6042 Int8PtrTy, ClassnfABIPtrTy);
6043 EHTypePtrTy = llvm::PointerType::getUnqual(EHTypeTy);
6046 llvm::Function *CGObjCNonFragileABIMac::ModuleInitFunction() {
6047 FinishNonFragileABIModule();
6052 void CGObjCNonFragileABIMac::AddModuleClassList(
6053 ArrayRef<llvm::GlobalValue *> Container, StringRef SymbolName,
6054 StringRef SectionName) {
6055 unsigned NumClasses = Container.size();
6060 SmallVector<llvm::Constant*, 8> Symbols(NumClasses);
6061 for (unsigned i=0; i<NumClasses; i++)
6062 Symbols[i] = llvm::ConstantExpr::getBitCast(Container[i],
6063 ObjCTypes.Int8PtrTy);
6064 llvm::Constant *Init =
6065 llvm::ConstantArray::get(llvm::ArrayType::get(ObjCTypes.Int8PtrTy,
6069 // Section name is obtained by calling GetSectionName, which returns
6070 // sections in the __DATA segment on MachO.
6071 assert((!CGM.getTriple().isOSBinFormatMachO() ||
6072 SectionName.startswith("__DATA")) &&
6073 "SectionName expected to start with __DATA on MachO");
6074 llvm::GlobalValue::LinkageTypes LT =
6075 getLinkageTypeForObjCMetadata(CGM, SectionName);
6076 llvm::GlobalVariable *GV =
6077 new llvm::GlobalVariable(CGM.getModule(), Init->getType(), false, LT, Init,
6079 GV->setAlignment(CGM.getDataLayout().getABITypeAlignment(Init->getType()));
6080 GV->setSection(SectionName);
6081 CGM.addCompilerUsedGlobal(GV);
6084 void CGObjCNonFragileABIMac::FinishNonFragileABIModule() {
6085 // nonfragile abi has no module definition.
6087 // Build list of all implemented class addresses in array
6088 // L_OBJC_LABEL_CLASS_$.
6090 for (unsigned i=0, NumClasses=ImplementedClasses.size(); i<NumClasses; i++) {
6091 const ObjCInterfaceDecl *ID = ImplementedClasses[i];
6093 if (ObjCImplementationDecl *IMP = ID->getImplementation())
6094 // We are implementing a weak imported interface. Give it external linkage
6095 if (ID->isWeakImported() && !IMP->isWeakImported()) {
6096 DefinedClasses[i]->setLinkage(llvm::GlobalVariable::ExternalLinkage);
6097 DefinedMetaClasses[i]->setLinkage(llvm::GlobalVariable::ExternalLinkage);
6101 AddModuleClassList(DefinedClasses, "OBJC_LABEL_CLASS_$",
6102 GetSectionName("__objc_classlist",
6103 "regular,no_dead_strip"));
6105 AddModuleClassList(DefinedNonLazyClasses, "OBJC_LABEL_NONLAZY_CLASS_$",
6106 GetSectionName("__objc_nlclslist",
6107 "regular,no_dead_strip"));
6109 // Build list of all implemented category addresses in array
6110 // L_OBJC_LABEL_CATEGORY_$.
6111 AddModuleClassList(DefinedCategories, "OBJC_LABEL_CATEGORY_$",
6112 GetSectionName("__objc_catlist",
6113 "regular,no_dead_strip"));
6114 AddModuleClassList(DefinedStubCategories, "OBJC_LABEL_STUB_CATEGORY_$",
6115 GetSectionName("__objc_catlist2",
6116 "regular,no_dead_strip"));
6117 AddModuleClassList(DefinedNonLazyCategories, "OBJC_LABEL_NONLAZY_CATEGORY_$",
6118 GetSectionName("__objc_nlcatlist",
6119 "regular,no_dead_strip"));
6124 /// isVTableDispatchedSelector - Returns true if SEL is not in the list of
6125 /// VTableDispatchMethods; false otherwise. What this means is that
6126 /// except for the 19 selectors in the list, we generate 32bit-style
6127 /// message dispatch call for all the rest.
6128 bool CGObjCNonFragileABIMac::isVTableDispatchedSelector(Selector Sel) {
6129 // At various points we've experimented with using vtable-based
6130 // dispatch for all methods.
6131 switch (CGM.getCodeGenOpts().getObjCDispatchMethod()) {
6132 case CodeGenOptions::Legacy:
6134 case CodeGenOptions::NonLegacy:
6136 case CodeGenOptions::Mixed:
6140 // If so, see whether this selector is in the white-list of things which must
6141 // use the new dispatch convention. We lazily build a dense set for this.
6142 if (VTableDispatchMethods.empty()) {
6143 VTableDispatchMethods.insert(GetNullarySelector("alloc"));
6144 VTableDispatchMethods.insert(GetNullarySelector("class"));
6145 VTableDispatchMethods.insert(GetNullarySelector("self"));
6146 VTableDispatchMethods.insert(GetNullarySelector("isFlipped"));
6147 VTableDispatchMethods.insert(GetNullarySelector("length"));
6148 VTableDispatchMethods.insert(GetNullarySelector("count"));
6150 // These are vtable-based if GC is disabled.
6151 // Optimistically use vtable dispatch for hybrid compiles.
6152 if (CGM.getLangOpts().getGC() != LangOptions::GCOnly) {
6153 VTableDispatchMethods.insert(GetNullarySelector("retain"));
6154 VTableDispatchMethods.insert(GetNullarySelector("release"));
6155 VTableDispatchMethods.insert(GetNullarySelector("autorelease"));
6158 VTableDispatchMethods.insert(GetUnarySelector("allocWithZone"));
6159 VTableDispatchMethods.insert(GetUnarySelector("isKindOfClass"));
6160 VTableDispatchMethods.insert(GetUnarySelector("respondsToSelector"));
6161 VTableDispatchMethods.insert(GetUnarySelector("objectForKey"));
6162 VTableDispatchMethods.insert(GetUnarySelector("objectAtIndex"));
6163 VTableDispatchMethods.insert(GetUnarySelector("isEqualToString"));
6164 VTableDispatchMethods.insert(GetUnarySelector("isEqual"));
6166 // These are vtable-based if GC is enabled.
6167 // Optimistically use vtable dispatch for hybrid compiles.
6168 if (CGM.getLangOpts().getGC() != LangOptions::NonGC) {
6169 VTableDispatchMethods.insert(GetNullarySelector("hash"));
6170 VTableDispatchMethods.insert(GetUnarySelector("addObject"));
6172 // "countByEnumeratingWithState:objects:count"
6173 IdentifierInfo *KeyIdents[] = {
6174 &CGM.getContext().Idents.get("countByEnumeratingWithState"),
6175 &CGM.getContext().Idents.get("objects"),
6176 &CGM.getContext().Idents.get("count")
6178 VTableDispatchMethods.insert(
6179 CGM.getContext().Selectors.getSelector(3, KeyIdents));
6183 return VTableDispatchMethods.count(Sel);
6186 /// BuildClassRoTInitializer - generate meta-data for:
6187 /// struct _class_ro_t {
6188 /// uint32_t const flags;
6189 /// uint32_t const instanceStart;
6190 /// uint32_t const instanceSize;
6191 /// uint32_t const reserved; // only when building for 64bit targets
6192 /// const uint8_t * const ivarLayout;
6193 /// const char *const name;
6194 /// const struct _method_list_t * const baseMethods;
6195 /// const struct _protocol_list_t *const baseProtocols;
6196 /// const struct _ivar_list_t *const ivars;
6197 /// const uint8_t * const weakIvarLayout;
6198 /// const struct _prop_list_t * const properties;
6201 llvm::GlobalVariable * CGObjCNonFragileABIMac::BuildClassRoTInitializer(
6203 unsigned InstanceStart,
6204 unsigned InstanceSize,
6205 const ObjCImplementationDecl *ID) {
6206 std::string ClassName = ID->getObjCRuntimeNameAsString();
6208 CharUnits beginInstance = CharUnits::fromQuantity(InstanceStart);
6209 CharUnits endInstance = CharUnits::fromQuantity(InstanceSize);
6211 bool hasMRCWeak = false;
6212 if (CGM.getLangOpts().ObjCAutoRefCount)
6213 flags |= NonFragileABI_Class_CompiledByARC;
6214 else if ((hasMRCWeak = hasMRCWeakIvars(CGM, ID)))
6215 flags |= NonFragileABI_Class_HasMRCWeakIvars;
6217 ConstantInitBuilder builder(CGM);
6218 auto values = builder.beginStruct(ObjCTypes.ClassRonfABITy);
6220 values.addInt(ObjCTypes.IntTy, flags);
6221 values.addInt(ObjCTypes.IntTy, InstanceStart);
6222 values.addInt(ObjCTypes.IntTy, InstanceSize);
6223 values.add((flags & NonFragileABI_Class_Meta)
6224 ? GetIvarLayoutName(nullptr, ObjCTypes)
6225 : BuildStrongIvarLayout(ID, beginInstance, endInstance));
6226 values.add(GetClassName(ID->getObjCRuntimeNameAsString()));
6228 // const struct _method_list_t * const baseMethods;
6229 SmallVector<const ObjCMethodDecl*, 16> methods;
6230 if (flags & NonFragileABI_Class_Meta) {
6231 for (const auto *MD : ID->class_methods())
6232 methods.push_back(MD);
6234 for (const auto *MD : ID->instance_methods())
6235 methods.push_back(MD);
6237 for (const auto *PID : ID->property_impls()) {
6238 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize){
6239 ObjCPropertyDecl *PD = PID->getPropertyDecl();
6241 if (auto MD = PD->getGetterMethodDecl())
6242 if (GetMethodDefinition(MD))
6243 methods.push_back(MD);
6244 if (auto MD = PD->getSetterMethodDecl())
6245 if (GetMethodDefinition(MD))
6246 methods.push_back(MD);
6251 values.add(emitMethodList(ID->getObjCRuntimeNameAsString(),
6252 (flags & NonFragileABI_Class_Meta)
6253 ? MethodListType::ClassMethods
6254 : MethodListType::InstanceMethods,
6257 const ObjCInterfaceDecl *OID = ID->getClassInterface();
6258 assert(OID && "CGObjCNonFragileABIMac::BuildClassRoTInitializer");
6259 values.add(EmitProtocolList("_OBJC_CLASS_PROTOCOLS_$_"
6260 + OID->getObjCRuntimeNameAsString(),
6261 OID->all_referenced_protocol_begin(),
6262 OID->all_referenced_protocol_end()));
6264 if (flags & NonFragileABI_Class_Meta) {
6265 values.addNullPointer(ObjCTypes.IvarListnfABIPtrTy);
6266 values.add(GetIvarLayoutName(nullptr, ObjCTypes));
6267 values.add(EmitPropertyList(
6268 "_OBJC_$_CLASS_PROP_LIST_" + ID->getObjCRuntimeNameAsString(),
6269 ID, ID->getClassInterface(), ObjCTypes, true));
6271 values.add(EmitIvarList(ID));
6272 values.add(BuildWeakIvarLayout(ID, beginInstance, endInstance, hasMRCWeak));
6273 values.add(EmitPropertyList(
6274 "_OBJC_$_PROP_LIST_" + ID->getObjCRuntimeNameAsString(),
6275 ID, ID->getClassInterface(), ObjCTypes, false));
6278 llvm::SmallString<64> roLabel;
6279 llvm::raw_svector_ostream(roLabel)
6280 << ((flags & NonFragileABI_Class_Meta) ? "_OBJC_METACLASS_RO_$_"
6281 : "_OBJC_CLASS_RO_$_")
6284 return finishAndCreateGlobal(values, roLabel, CGM);
6287 /// Build the metaclass object for a class.
6289 /// struct _class_t {
6290 /// struct _class_t *isa;
6291 /// struct _class_t * const superclass;
6294 /// struct class_ro_t *ro;
6297 llvm::GlobalVariable *
6298 CGObjCNonFragileABIMac::BuildClassObject(const ObjCInterfaceDecl *CI,
6300 llvm::Constant *IsAGV,
6301 llvm::Constant *SuperClassGV,
6302 llvm::Constant *ClassRoGV,
6303 bool HiddenVisibility) {
6304 ConstantInitBuilder builder(CGM);
6305 auto values = builder.beginStruct(ObjCTypes.ClassnfABITy);
6308 values.add(SuperClassGV);
6310 values.addNullPointer(ObjCTypes.ClassnfABIPtrTy);
6312 values.add(ObjCEmptyCacheVar);
6313 values.add(ObjCEmptyVtableVar);
6314 values.add(ClassRoGV);
6316 llvm::GlobalVariable *GV =
6317 cast<llvm::GlobalVariable>(GetClassGlobal(CI, isMetaclass, ForDefinition));
6318 values.finishAndSetAsInitializer(GV);
6320 if (CGM.getTriple().isOSBinFormatMachO())
6321 GV->setSection("__DATA, __objc_data");
6323 CGM.getDataLayout().getABITypeAlignment(ObjCTypes.ClassnfABITy));
6324 if (!CGM.getTriple().isOSBinFormatCOFF())
6325 if (HiddenVisibility)
6326 GV->setVisibility(llvm::GlobalValue::HiddenVisibility);
6330 bool CGObjCNonFragileABIMac::ImplementationIsNonLazy(
6331 const ObjCImplDecl *OD) const {
6332 return OD->getClassMethod(GetNullarySelector("load")) != nullptr ||
6333 OD->getClassInterface()->hasAttr<ObjCNonLazyClassAttr>() ||
6334 OD->hasAttr<ObjCNonLazyClassAttr>();
6337 void CGObjCNonFragileABIMac::GetClassSizeInfo(const ObjCImplementationDecl *OID,
6338 uint32_t &InstanceStart,
6339 uint32_t &InstanceSize) {
6340 const ASTRecordLayout &RL =
6341 CGM.getContext().getASTObjCImplementationLayout(OID);
6343 // InstanceSize is really instance end.
6344 InstanceSize = RL.getDataSize().getQuantity();
6346 // If there are no fields, the start is the same as the end.
6347 if (!RL.getFieldCount())
6348 InstanceStart = InstanceSize;
6350 InstanceStart = RL.getFieldOffset(0) / CGM.getContext().getCharWidth();
6353 static llvm::GlobalValue::DLLStorageClassTypes getStorage(CodeGenModule &CGM,
6355 IdentifierInfo &II = CGM.getContext().Idents.get(Name);
6356 TranslationUnitDecl *TUDecl = CGM.getContext().getTranslationUnitDecl();
6357 DeclContext *DC = TranslationUnitDecl::castToDeclContext(TUDecl);
6359 const VarDecl *VD = nullptr;
6360 for (const auto &Result : DC->lookup(&II))
6361 if ((VD = dyn_cast<VarDecl>(Result)))
6365 return llvm::GlobalValue::DLLImportStorageClass;
6366 if (VD->hasAttr<DLLExportAttr>())
6367 return llvm::GlobalValue::DLLExportStorageClass;
6368 if (VD->hasAttr<DLLImportAttr>())
6369 return llvm::GlobalValue::DLLImportStorageClass;
6370 return llvm::GlobalValue::DefaultStorageClass;
6373 void CGObjCNonFragileABIMac::GenerateClass(const ObjCImplementationDecl *ID) {
6374 if (!ObjCEmptyCacheVar) {
6376 new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.CacheTy, false,
6377 llvm::GlobalValue::ExternalLinkage, nullptr,
6378 "_objc_empty_cache");
6379 if (CGM.getTriple().isOSBinFormatCOFF())
6380 ObjCEmptyCacheVar->setDLLStorageClass(getStorage(CGM, "_objc_empty_cache"));
6382 // Only OS X with deployment version <10.9 use the empty vtable symbol
6383 const llvm::Triple &Triple = CGM.getTarget().getTriple();
6384 if (Triple.isMacOSX() && Triple.isMacOSXVersionLT(10, 9))
6385 ObjCEmptyVtableVar =
6386 new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.ImpnfABITy, false,
6387 llvm::GlobalValue::ExternalLinkage, nullptr,
6388 "_objc_empty_vtable");
6390 ObjCEmptyVtableVar =
6391 llvm::ConstantPointerNull::get(ObjCTypes.ImpnfABITy->getPointerTo());
6394 // FIXME: Is this correct (that meta class size is never computed)?
6395 uint32_t InstanceStart =
6396 CGM.getDataLayout().getTypeAllocSize(ObjCTypes.ClassnfABITy);
6397 uint32_t InstanceSize = InstanceStart;
6398 uint32_t flags = NonFragileABI_Class_Meta;
6400 llvm::Constant *SuperClassGV, *IsAGV;
6402 const auto *CI = ID->getClassInterface();
6403 assert(CI && "CGObjCNonFragileABIMac::GenerateClass - class is 0");
6405 // Build the flags for the metaclass.
6406 bool classIsHidden = (CGM.getTriple().isOSBinFormatCOFF())
6407 ? !CI->hasAttr<DLLExportAttr>()
6408 : CI->getVisibility() == HiddenVisibility;
6410 flags |= NonFragileABI_Class_Hidden;
6412 // FIXME: why is this flag set on the metaclass?
6413 // ObjC metaclasses have no fields and don't really get constructed.
6414 if (ID->hasNonZeroConstructors() || ID->hasDestructors()) {
6415 flags |= NonFragileABI_Class_HasCXXStructors;
6416 if (!ID->hasNonZeroConstructors())
6417 flags |= NonFragileABI_Class_HasCXXDestructorOnly;
6420 if (!CI->getSuperClass()) {
6422 flags |= NonFragileABI_Class_Root;
6424 SuperClassGV = GetClassGlobal(CI, /*metaclass*/ false, NotForDefinition);
6425 IsAGV = GetClassGlobal(CI, /*metaclass*/ true, NotForDefinition);
6427 // Has a root. Current class is not a root.
6428 const ObjCInterfaceDecl *Root = ID->getClassInterface();
6429 while (const ObjCInterfaceDecl *Super = Root->getSuperClass())
6432 const auto *Super = CI->getSuperClass();
6433 IsAGV = GetClassGlobal(Root, /*metaclass*/ true, NotForDefinition);
6434 SuperClassGV = GetClassGlobal(Super, /*metaclass*/ true, NotForDefinition);
6437 llvm::GlobalVariable *CLASS_RO_GV =
6438 BuildClassRoTInitializer(flags, InstanceStart, InstanceSize, ID);
6440 llvm::GlobalVariable *MetaTClass =
6441 BuildClassObject(CI, /*metaclass*/ true,
6442 IsAGV, SuperClassGV, CLASS_RO_GV, classIsHidden);
6443 CGM.setGVProperties(MetaTClass, CI);
6444 DefinedMetaClasses.push_back(MetaTClass);
6446 // Metadata for the class
6449 flags |= NonFragileABI_Class_Hidden;
6451 if (ID->hasNonZeroConstructors() || ID->hasDestructors()) {
6452 flags |= NonFragileABI_Class_HasCXXStructors;
6454 // Set a flag to enable a runtime optimization when a class has
6455 // fields that require destruction but which don't require
6456 // anything except zero-initialization during construction. This
6457 // is most notably true of __strong and __weak types, but you can
6458 // also imagine there being C++ types with non-trivial default
6459 // constructors that merely set all fields to null.
6460 if (!ID->hasNonZeroConstructors())
6461 flags |= NonFragileABI_Class_HasCXXDestructorOnly;
6464 if (hasObjCExceptionAttribute(CGM.getContext(), CI))
6465 flags |= NonFragileABI_Class_Exception;
6467 if (!CI->getSuperClass()) {
6468 flags |= NonFragileABI_Class_Root;
6469 SuperClassGV = nullptr;
6471 // Has a root. Current class is not a root.
6472 const auto *Super = CI->getSuperClass();
6473 SuperClassGV = GetClassGlobal(Super, /*metaclass*/ false, NotForDefinition);
6476 GetClassSizeInfo(ID, InstanceStart, InstanceSize);
6478 BuildClassRoTInitializer(flags, InstanceStart, InstanceSize, ID);
6480 llvm::GlobalVariable *ClassMD =
6481 BuildClassObject(CI, /*metaclass*/ false,
6482 MetaTClass, SuperClassGV, CLASS_RO_GV, classIsHidden);
6483 CGM.setGVProperties(ClassMD, CI);
6484 DefinedClasses.push_back(ClassMD);
6485 ImplementedClasses.push_back(CI);
6487 // Determine if this class is also "non-lazy".
6488 if (ImplementationIsNonLazy(ID))
6489 DefinedNonLazyClasses.push_back(ClassMD);
6491 // Force the definition of the EHType if necessary.
6492 if (flags & NonFragileABI_Class_Exception)
6493 (void) GetInterfaceEHType(CI, ForDefinition);
6494 // Make sure method definition entries are all clear for next implementation.
6495 MethodDefinitions.clear();
6498 /// GenerateProtocolRef - This routine is called to generate code for
6499 /// a protocol reference expression; as in:
6501 /// @protocol(Proto1);
6503 /// It generates a weak reference to l_OBJC_PROTOCOL_REFERENCE_$_Proto1
6504 /// which will hold address of the protocol meta-data.
6506 llvm::Value *CGObjCNonFragileABIMac::GenerateProtocolRef(CodeGenFunction &CGF,
6507 const ObjCProtocolDecl *PD) {
6509 // This routine is called for @protocol only. So, we must build definition
6510 // of protocol's meta-data (not a reference to it!)
6512 llvm::Constant *Init =
6513 llvm::ConstantExpr::getBitCast(GetOrEmitProtocol(PD),
6514 ObjCTypes.getExternalProtocolPtrTy());
6516 std::string ProtocolName("_OBJC_PROTOCOL_REFERENCE_$_");
6517 ProtocolName += PD->getObjCRuntimeNameAsString();
6519 CharUnits Align = CGF.getPointerAlign();
6521 llvm::GlobalVariable *PTGV = CGM.getModule().getGlobalVariable(ProtocolName);
6523 return CGF.Builder.CreateAlignedLoad(PTGV, Align);
6524 PTGV = new llvm::GlobalVariable(CGM.getModule(), Init->getType(), false,
6525 llvm::GlobalValue::WeakAnyLinkage, Init,
6527 PTGV->setSection(GetSectionName("__objc_protorefs",
6528 "coalesced,no_dead_strip"));
6529 PTGV->setVisibility(llvm::GlobalValue::HiddenVisibility);
6530 PTGV->setAlignment(Align.getQuantity());
6531 if (!CGM.getTriple().isOSBinFormatMachO())
6532 PTGV->setComdat(CGM.getModule().getOrInsertComdat(ProtocolName));
6533 CGM.addUsedGlobal(PTGV);
6534 return CGF.Builder.CreateAlignedLoad(PTGV, Align);
6537 /// GenerateCategory - Build metadata for a category implementation.
6538 /// struct _category_t {
6539 /// const char * const name;
6540 /// struct _class_t *const cls;
6541 /// const struct _method_list_t * const instance_methods;
6542 /// const struct _method_list_t * const class_methods;
6543 /// const struct _protocol_list_t * const protocols;
6544 /// const struct _prop_list_t * const properties;
6545 /// const struct _prop_list_t * const class_properties;
6546 /// const uint32_t size;
6549 void CGObjCNonFragileABIMac::GenerateCategory(const ObjCCategoryImplDecl *OCD) {
6550 const ObjCInterfaceDecl *Interface = OCD->getClassInterface();
6551 const char *Prefix = "_OBJC_$_CATEGORY_";
6553 llvm::SmallString<64> ExtCatName(Prefix);
6554 ExtCatName += Interface->getObjCRuntimeNameAsString();
6555 ExtCatName += "_$_";
6556 ExtCatName += OCD->getNameAsString();
6558 ConstantInitBuilder builder(CGM);
6559 auto values = builder.beginStruct(ObjCTypes.CategorynfABITy);
6560 values.add(GetClassName(OCD->getIdentifier()->getName()));
6561 // meta-class entry symbol
6562 values.add(GetClassGlobal(Interface, /*metaclass*/ false, NotForDefinition));
6563 std::string listName =
6564 (Interface->getObjCRuntimeNameAsString() + "_$_" + OCD->getName()).str();
6566 SmallVector<const ObjCMethodDecl *, 16> instanceMethods;
6567 SmallVector<const ObjCMethodDecl *, 8> classMethods;
6568 for (const auto *MD : OCD->methods()) {
6569 if (MD->isInstanceMethod()) {
6570 instanceMethods.push_back(MD);
6572 classMethods.push_back(MD);
6576 values.add(emitMethodList(listName, MethodListType::CategoryInstanceMethods,
6578 values.add(emitMethodList(listName, MethodListType::CategoryClassMethods,
6581 const ObjCCategoryDecl *Category =
6582 Interface->FindCategoryDeclaration(OCD->getIdentifier());
6584 SmallString<256> ExtName;
6585 llvm::raw_svector_ostream(ExtName) << Interface->getObjCRuntimeNameAsString() << "_$_"
6587 values.add(EmitProtocolList("_OBJC_CATEGORY_PROTOCOLS_$_"
6588 + Interface->getObjCRuntimeNameAsString() + "_$_"
6589 + Category->getName(),
6590 Category->protocol_begin(),
6591 Category->protocol_end()));
6592 values.add(EmitPropertyList("_OBJC_$_PROP_LIST_" + ExtName.str(),
6593 OCD, Category, ObjCTypes, false));
6594 values.add(EmitPropertyList("_OBJC_$_CLASS_PROP_LIST_" + ExtName.str(),
6595 OCD, Category, ObjCTypes, true));
6597 values.addNullPointer(ObjCTypes.ProtocolListnfABIPtrTy);
6598 values.addNullPointer(ObjCTypes.PropertyListPtrTy);
6599 values.addNullPointer(ObjCTypes.PropertyListPtrTy);
6602 unsigned Size = CGM.getDataLayout().getTypeAllocSize(ObjCTypes.CategorynfABITy);
6603 values.addInt(ObjCTypes.IntTy, Size);
6605 llvm::GlobalVariable *GCATV =
6606 finishAndCreateGlobal(values, ExtCatName.str(), CGM);
6607 CGM.addCompilerUsedGlobal(GCATV);
6608 if (Interface->hasAttr<ObjCClassStubAttr>())
6609 DefinedStubCategories.push_back(GCATV);
6611 DefinedCategories.push_back(GCATV);
6613 // Determine if this category is also "non-lazy".
6614 if (ImplementationIsNonLazy(OCD))
6615 DefinedNonLazyCategories.push_back(GCATV);
6616 // method definition entries must be clear for next implementation.
6617 MethodDefinitions.clear();
6620 /// emitMethodConstant - Return a struct objc_method constant. If
6621 /// forProtocol is true, the implementation will be null; otherwise,
6622 /// the method must have a definition registered with the runtime.
6624 /// struct _objc_method {
6626 /// char *method_type;
6629 void CGObjCNonFragileABIMac::emitMethodConstant(ConstantArrayBuilder &builder,
6630 const ObjCMethodDecl *MD,
6632 auto method = builder.beginStruct(ObjCTypes.MethodTy);
6633 method.addBitCast(GetMethodVarName(MD->getSelector()),
6634 ObjCTypes.SelectorPtrTy);
6635 method.add(GetMethodVarType(MD));
6638 // Protocol methods have no implementation. So, this entry is always NULL.
6639 method.addNullPointer(ObjCTypes.Int8PtrTy);
6641 llvm::Function *fn = GetMethodDefinition(MD);
6642 assert(fn && "no definition for method?");
6643 method.addBitCast(fn, ObjCTypes.Int8PtrTy);
6646 method.finishAndAddTo(builder);
6649 /// Build meta-data for method declarations.
6651 /// struct _method_list_t {
6652 /// uint32_t entsize; // sizeof(struct _objc_method)
6653 /// uint32_t method_count;
6654 /// struct _objc_method method_list[method_count];
6658 CGObjCNonFragileABIMac::emitMethodList(Twine name, MethodListType kind,
6659 ArrayRef<const ObjCMethodDecl *> methods) {
6660 // Return null for empty list.
6661 if (methods.empty())
6662 return llvm::Constant::getNullValue(ObjCTypes.MethodListnfABIPtrTy);
6667 case MethodListType::CategoryInstanceMethods:
6668 prefix = "_OBJC_$_CATEGORY_INSTANCE_METHODS_";
6669 forProtocol = false;
6671 case MethodListType::CategoryClassMethods:
6672 prefix = "_OBJC_$_CATEGORY_CLASS_METHODS_";
6673 forProtocol = false;
6675 case MethodListType::InstanceMethods:
6676 prefix = "_OBJC_$_INSTANCE_METHODS_";
6677 forProtocol = false;
6679 case MethodListType::ClassMethods:
6680 prefix = "_OBJC_$_CLASS_METHODS_";
6681 forProtocol = false;
6684 case MethodListType::ProtocolInstanceMethods:
6685 prefix = "_OBJC_$_PROTOCOL_INSTANCE_METHODS_";
6688 case MethodListType::ProtocolClassMethods:
6689 prefix = "_OBJC_$_PROTOCOL_CLASS_METHODS_";
6692 case MethodListType::OptionalProtocolInstanceMethods:
6693 prefix = "_OBJC_$_PROTOCOL_INSTANCE_METHODS_OPT_";
6696 case MethodListType::OptionalProtocolClassMethods:
6697 prefix = "_OBJC_$_PROTOCOL_CLASS_METHODS_OPT_";
6702 ConstantInitBuilder builder(CGM);
6703 auto values = builder.beginStruct();
6705 // sizeof(struct _objc_method)
6706 unsigned Size = CGM.getDataLayout().getTypeAllocSize(ObjCTypes.MethodTy);
6707 values.addInt(ObjCTypes.IntTy, Size);
6709 values.addInt(ObjCTypes.IntTy, methods.size());
6710 auto methodArray = values.beginArray(ObjCTypes.MethodTy);
6711 for (auto MD : methods) {
6712 emitMethodConstant(methodArray, MD, forProtocol);
6714 methodArray.finishAndAddTo(values);
6716 llvm::GlobalVariable *GV = finishAndCreateGlobal(values, prefix + name, CGM);
6717 CGM.addCompilerUsedGlobal(GV);
6718 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.MethodListnfABIPtrTy);
6721 /// ObjCIvarOffsetVariable - Returns the ivar offset variable for
6723 llvm::GlobalVariable *
6724 CGObjCNonFragileABIMac::ObjCIvarOffsetVariable(const ObjCInterfaceDecl *ID,
6725 const ObjCIvarDecl *Ivar) {
6726 const ObjCInterfaceDecl *Container = Ivar->getContainingInterface();
6727 llvm::SmallString<64> Name("OBJC_IVAR_$_");
6728 Name += Container->getObjCRuntimeNameAsString();
6730 Name += Ivar->getName();
6731 llvm::GlobalVariable *IvarOffsetGV = CGM.getModule().getGlobalVariable(Name);
6732 if (!IvarOffsetGV) {
6734 new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.IvarOffsetVarTy,
6735 false, llvm::GlobalValue::ExternalLinkage,
6736 nullptr, Name.str());
6737 if (CGM.getTriple().isOSBinFormatCOFF()) {
6738 bool IsPrivateOrPackage =
6739 Ivar->getAccessControl() == ObjCIvarDecl::Private ||
6740 Ivar->getAccessControl() == ObjCIvarDecl::Package;
6742 const ObjCInterfaceDecl *ContainingID = Ivar->getContainingInterface();
6744 if (ContainingID->hasAttr<DLLImportAttr>())
6746 ->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
6747 else if (ContainingID->hasAttr<DLLExportAttr>() && !IsPrivateOrPackage)
6749 ->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
6752 return IvarOffsetGV;
6756 CGObjCNonFragileABIMac::EmitIvarOffsetVar(const ObjCInterfaceDecl *ID,
6757 const ObjCIvarDecl *Ivar,
6758 unsigned long int Offset) {
6759 llvm::GlobalVariable *IvarOffsetGV = ObjCIvarOffsetVariable(ID, Ivar);
6760 IvarOffsetGV->setInitializer(
6761 llvm::ConstantInt::get(ObjCTypes.IvarOffsetVarTy, Offset));
6762 IvarOffsetGV->setAlignment(
6763 CGM.getDataLayout().getABITypeAlignment(ObjCTypes.IvarOffsetVarTy));
6765 if (!CGM.getTriple().isOSBinFormatCOFF()) {
6766 // FIXME: This matches gcc, but shouldn't the visibility be set on the use
6767 // as well (i.e., in ObjCIvarOffsetVariable).
6768 if (Ivar->getAccessControl() == ObjCIvarDecl::Private ||
6769 Ivar->getAccessControl() == ObjCIvarDecl::Package ||
6770 ID->getVisibility() == HiddenVisibility)
6771 IvarOffsetGV->setVisibility(llvm::GlobalValue::HiddenVisibility);
6773 IvarOffsetGV->setVisibility(llvm::GlobalValue::DefaultVisibility);
6776 // If ID's layout is known, then make the global constant. This serves as a
6777 // useful assertion: we'll never use this variable to calculate ivar offsets,
6778 // so if the runtime tries to patch it then we should crash.
6779 if (isClassLayoutKnownStatically(ID))
6780 IvarOffsetGV->setConstant(true);
6782 if (CGM.getTriple().isOSBinFormatMachO())
6783 IvarOffsetGV->setSection("__DATA, __objc_ivar");
6784 return IvarOffsetGV;
6787 /// EmitIvarList - Emit the ivar list for the given
6788 /// implementation. The return value has type
6789 /// IvarListnfABIPtrTy.
6790 /// struct _ivar_t {
6791 /// unsigned [long] int *offset; // pointer to ivar offset location
6794 /// uint32_t alignment;
6797 /// struct _ivar_list_t {
6798 /// uint32 entsize; // sizeof(struct _ivar_t)
6800 /// struct _iver_t list[count];
6804 llvm::Constant *CGObjCNonFragileABIMac::EmitIvarList(
6805 const ObjCImplementationDecl *ID) {
6807 ConstantInitBuilder builder(CGM);
6808 auto ivarList = builder.beginStruct();
6809 ivarList.addInt(ObjCTypes.IntTy,
6810 CGM.getDataLayout().getTypeAllocSize(ObjCTypes.IvarnfABITy));
6811 auto ivarCountSlot = ivarList.addPlaceholder();
6812 auto ivars = ivarList.beginArray(ObjCTypes.IvarnfABITy);
6814 const ObjCInterfaceDecl *OID = ID->getClassInterface();
6815 assert(OID && "CGObjCNonFragileABIMac::EmitIvarList - null interface");
6817 // FIXME. Consolidate this with similar code in GenerateClass.
6819 for (const ObjCIvarDecl *IVD = OID->all_declared_ivar_begin();
6820 IVD; IVD = IVD->getNextIvar()) {
6821 // Ignore unnamed bit-fields.
6822 if (!IVD->getDeclName())
6825 auto ivar = ivars.beginStruct(ObjCTypes.IvarnfABITy);
6826 ivar.add(EmitIvarOffsetVar(ID->getClassInterface(), IVD,
6827 ComputeIvarBaseOffset(CGM, ID, IVD)));
6828 ivar.add(GetMethodVarName(IVD->getIdentifier()));
6829 ivar.add(GetMethodVarType(IVD));
6830 llvm::Type *FieldTy =
6831 CGM.getTypes().ConvertTypeForMem(IVD->getType());
6832 unsigned Size = CGM.getDataLayout().getTypeAllocSize(FieldTy);
6833 unsigned Align = CGM.getContext().getPreferredTypeAlign(
6834 IVD->getType().getTypePtr()) >> 3;
6835 Align = llvm::Log2_32(Align);
6836 ivar.addInt(ObjCTypes.IntTy, Align);
6837 // NOTE. Size of a bitfield does not match gcc's, because of the
6838 // way bitfields are treated special in each. But I am told that
6839 // 'size' for bitfield ivars is ignored by the runtime so it does
6840 // not matter. If it matters, there is enough info to get the
6842 ivar.addInt(ObjCTypes.IntTy, Size);
6843 ivar.finishAndAddTo(ivars);
6845 // Return null for empty list.
6846 if (ivars.empty()) {
6849 return llvm::Constant::getNullValue(ObjCTypes.IvarListnfABIPtrTy);
6852 auto ivarCount = ivars.size();
6853 ivars.finishAndAddTo(ivarList);
6854 ivarList.fillPlaceholderWithInt(ivarCountSlot, ObjCTypes.IntTy, ivarCount);
6856 const char *Prefix = "_OBJC_$_INSTANCE_VARIABLES_";
6857 llvm::GlobalVariable *GV = finishAndCreateGlobal(
6858 ivarList, Prefix + OID->getObjCRuntimeNameAsString(), CGM);
6859 CGM.addCompilerUsedGlobal(GV);
6860 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.IvarListnfABIPtrTy);
6863 llvm::Constant *CGObjCNonFragileABIMac::GetOrEmitProtocolRef(
6864 const ObjCProtocolDecl *PD) {
6865 llvm::GlobalVariable *&Entry = Protocols[PD->getIdentifier()];
6868 // We use the initializer as a marker of whether this is a forward
6869 // reference or not. At module finalization we add the empty
6870 // contents for protocols which were referenced but never defined.
6871 llvm::SmallString<64> Protocol;
6872 llvm::raw_svector_ostream(Protocol) << "_OBJC_PROTOCOL_$_"
6873 << PD->getObjCRuntimeNameAsString();
6875 Entry = new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.ProtocolnfABITy,
6876 false, llvm::GlobalValue::ExternalLinkage,
6878 if (!CGM.getTriple().isOSBinFormatMachO())
6879 Entry->setComdat(CGM.getModule().getOrInsertComdat(Protocol));
6885 /// GetOrEmitProtocol - Generate the protocol meta-data:
6887 /// struct _protocol_t {
6889 /// const char * const protocol_name;
6890 /// const struct _protocol_list_t * protocol_list; // super protocols
6891 /// const struct method_list_t * const instance_methods;
6892 /// const struct method_list_t * const class_methods;
6893 /// const struct method_list_t *optionalInstanceMethods;
6894 /// const struct method_list_t *optionalClassMethods;
6895 /// const struct _prop_list_t * properties;
6896 /// const uint32_t size; // sizeof(struct _protocol_t)
6897 /// const uint32_t flags; // = 0
6898 /// const char ** extendedMethodTypes;
6899 /// const char *demangledName;
6900 /// const struct _prop_list_t * class_properties;
6905 llvm::Constant *CGObjCNonFragileABIMac::GetOrEmitProtocol(
6906 const ObjCProtocolDecl *PD) {
6907 llvm::GlobalVariable *Entry = Protocols[PD->getIdentifier()];
6909 // Early exit if a defining object has already been generated.
6910 if (Entry && Entry->hasInitializer())
6913 // Use the protocol definition, if there is one.
6914 assert(PD->hasDefinition() &&
6915 "emitting protocol metadata without definition");
6916 PD = PD->getDefinition();
6918 auto methodLists = ProtocolMethodLists::get(PD);
6920 ConstantInitBuilder builder(CGM);
6921 auto values = builder.beginStruct(ObjCTypes.ProtocolnfABITy);
6924 values.addNullPointer(ObjCTypes.ObjectPtrTy);
6925 values.add(GetClassName(PD->getObjCRuntimeNameAsString()));
6926 values.add(EmitProtocolList("_OBJC_$_PROTOCOL_REFS_"
6927 + PD->getObjCRuntimeNameAsString(),
6928 PD->protocol_begin(),
6929 PD->protocol_end()));
6930 values.add(methodLists.emitMethodList(this, PD,
6931 ProtocolMethodLists::RequiredInstanceMethods));
6932 values.add(methodLists.emitMethodList(this, PD,
6933 ProtocolMethodLists::RequiredClassMethods));
6934 values.add(methodLists.emitMethodList(this, PD,
6935 ProtocolMethodLists::OptionalInstanceMethods));
6936 values.add(methodLists.emitMethodList(this, PD,
6937 ProtocolMethodLists::OptionalClassMethods));
6938 values.add(EmitPropertyList(
6939 "_OBJC_$_PROP_LIST_" + PD->getObjCRuntimeNameAsString(),
6940 nullptr, PD, ObjCTypes, false));
6942 CGM.getDataLayout().getTypeAllocSize(ObjCTypes.ProtocolnfABITy);
6943 values.addInt(ObjCTypes.IntTy, Size);
6944 values.addInt(ObjCTypes.IntTy, 0);
6945 values.add(EmitProtocolMethodTypes("_OBJC_$_PROTOCOL_METHOD_TYPES_"
6946 + PD->getObjCRuntimeNameAsString(),
6947 methodLists.emitExtendedTypesArray(this),
6950 // const char *demangledName;
6951 values.addNullPointer(ObjCTypes.Int8PtrTy);
6953 values.add(EmitPropertyList(
6954 "_OBJC_$_CLASS_PROP_LIST_" + PD->getObjCRuntimeNameAsString(),
6955 nullptr, PD, ObjCTypes, true));
6958 // Already created, fix the linkage and update the initializer.
6959 Entry->setLinkage(llvm::GlobalValue::WeakAnyLinkage);
6960 values.finishAndSetAsInitializer(Entry);
6962 llvm::SmallString<64> symbolName;
6963 llvm::raw_svector_ostream(symbolName)
6964 << "_OBJC_PROTOCOL_$_" << PD->getObjCRuntimeNameAsString();
6966 Entry = values.finishAndCreateGlobal(symbolName, CGM.getPointerAlign(),
6968 llvm::GlobalValue::WeakAnyLinkage);
6969 if (!CGM.getTriple().isOSBinFormatMachO())
6970 Entry->setComdat(CGM.getModule().getOrInsertComdat(symbolName));
6972 Protocols[PD->getIdentifier()] = Entry;
6974 Entry->setVisibility(llvm::GlobalValue::HiddenVisibility);
6975 CGM.addUsedGlobal(Entry);
6977 // Use this protocol meta-data to build protocol list table in section
6978 // __DATA, __objc_protolist
6979 llvm::SmallString<64> ProtocolRef;
6980 llvm::raw_svector_ostream(ProtocolRef) << "_OBJC_LABEL_PROTOCOL_$_"
6981 << PD->getObjCRuntimeNameAsString();
6983 llvm::GlobalVariable *PTGV =
6984 new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.ProtocolnfABIPtrTy,
6985 false, llvm::GlobalValue::WeakAnyLinkage, Entry,
6987 if (!CGM.getTriple().isOSBinFormatMachO())
6988 PTGV->setComdat(CGM.getModule().getOrInsertComdat(ProtocolRef));
6990 CGM.getDataLayout().getABITypeAlignment(ObjCTypes.ProtocolnfABIPtrTy));
6991 PTGV->setSection(GetSectionName("__objc_protolist",
6992 "coalesced,no_dead_strip"));
6993 PTGV->setVisibility(llvm::GlobalValue::HiddenVisibility);
6994 CGM.addUsedGlobal(PTGV);
6998 /// EmitProtocolList - Generate protocol list meta-data:
7000 /// struct _protocol_list_t {
7001 /// long protocol_count; // Note, this is 32/64 bit
7002 /// struct _protocol_t[protocol_count];
7007 CGObjCNonFragileABIMac::EmitProtocolList(Twine Name,
7008 ObjCProtocolDecl::protocol_iterator begin,
7009 ObjCProtocolDecl::protocol_iterator end) {
7010 SmallVector<llvm::Constant *, 16> ProtocolRefs;
7012 // Just return null for empty protocol lists
7014 return llvm::Constant::getNullValue(ObjCTypes.ProtocolListnfABIPtrTy);
7016 // FIXME: We shouldn't need to do this lookup here, should we?
7017 SmallString<256> TmpName;
7018 Name.toVector(TmpName);
7019 llvm::GlobalVariable *GV =
7020 CGM.getModule().getGlobalVariable(TmpName.str(), true);
7022 return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.ProtocolListnfABIPtrTy);
7024 ConstantInitBuilder builder(CGM);
7025 auto values = builder.beginStruct();
7026 auto countSlot = values.addPlaceholder();
7028 // A null-terminated array of protocols.
7029 auto array = values.beginArray(ObjCTypes.ProtocolnfABIPtrTy);
7030 for (; begin != end; ++begin)
7031 array.add(GetProtocolRef(*begin)); // Implemented???
7032 auto count = array.size();
7033 array.addNullPointer(ObjCTypes.ProtocolnfABIPtrTy);
7035 array.finishAndAddTo(values);
7036 values.fillPlaceholderWithInt(countSlot, ObjCTypes.LongTy, count);
7038 GV = finishAndCreateGlobal(values, Name, CGM);
7039 CGM.addCompilerUsedGlobal(GV);
7040 return llvm::ConstantExpr::getBitCast(GV,
7041 ObjCTypes.ProtocolListnfABIPtrTy);
7044 /// EmitObjCValueForIvar - Code Gen for nonfragile ivar reference.
7045 /// This code gen. amounts to generating code for:
7047 /// (type *)((char *)base + _OBJC_IVAR_$_.ivar;
7050 LValue CGObjCNonFragileABIMac::EmitObjCValueForIvar(
7051 CodeGen::CodeGenFunction &CGF,
7053 llvm::Value *BaseValue,
7054 const ObjCIvarDecl *Ivar,
7055 unsigned CVRQualifiers) {
7056 ObjCInterfaceDecl *ID = ObjectTy->getAs<ObjCObjectType>()->getInterface();
7057 llvm::Value *Offset = EmitIvarOffset(CGF, ID, Ivar);
7058 return EmitValueForIvarAtOffset(CGF, ID, BaseValue, Ivar, CVRQualifiers,
7063 CGObjCNonFragileABIMac::EmitIvarOffset(CodeGen::CodeGenFunction &CGF,
7064 const ObjCInterfaceDecl *Interface,
7065 const ObjCIvarDecl *Ivar) {
7066 llvm::Value *IvarOffsetValue;
7067 if (isClassLayoutKnownStatically(Interface)) {
7068 IvarOffsetValue = llvm::ConstantInt::get(
7069 ObjCTypes.IvarOffsetVarTy,
7070 ComputeIvarBaseOffset(CGM, Interface->getImplementation(), Ivar));
7072 llvm::GlobalVariable *GV = ObjCIvarOffsetVariable(Interface, Ivar);
7074 CGF.Builder.CreateAlignedLoad(GV, CGF.getSizeAlign(), "ivar");
7075 if (IsIvarOffsetKnownIdempotent(CGF, Ivar))
7076 cast<llvm::LoadInst>(IvarOffsetValue)
7077 ->setMetadata(CGM.getModule().getMDKindID("invariant.load"),
7078 llvm::MDNode::get(VMContext, None));
7081 // This could be 32bit int or 64bit integer depending on the architecture.
7082 // Cast it to 64bit integer value, if it is a 32bit integer ivar offset value
7083 // as this is what caller always expects.
7084 if (ObjCTypes.IvarOffsetVarTy == ObjCTypes.IntTy)
7085 IvarOffsetValue = CGF.Builder.CreateIntCast(
7086 IvarOffsetValue, ObjCTypes.LongTy, true, "ivar.conv");
7087 return IvarOffsetValue;
7090 static void appendSelectorForMessageRefTable(std::string &buffer,
7091 Selector selector) {
7092 if (selector.isUnarySelector()) {
7093 buffer += selector.getNameForSlot(0);
7097 for (unsigned i = 0, e = selector.getNumArgs(); i != e; ++i) {
7098 buffer += selector.getNameForSlot(i);
7103 /// Emit a "vtable" message send. We emit a weak hidden-visibility
7104 /// struct, initially containing the selector pointer and a pointer to
7105 /// a "fixup" variant of the appropriate objc_msgSend. To call, we
7106 /// load and call the function pointer, passing the address of the
7107 /// struct as the second parameter. The runtime determines whether
7108 /// the selector is currently emitted using vtable dispatch; if so, it
7109 /// substitutes a stub function which simply tail-calls through the
7110 /// appropriate vtable slot, and if not, it substitues a stub function
7111 /// which tail-calls objc_msgSend. Both stubs adjust the selector
7112 /// argument to correctly point to the selector.
7114 CGObjCNonFragileABIMac::EmitVTableMessageSend(CodeGenFunction &CGF,
7115 ReturnValueSlot returnSlot,
7116 QualType resultType,
7121 const CallArgList &formalArgs,
7122 const ObjCMethodDecl *method) {
7123 // Compute the actual arguments.
7126 // First argument: the receiver / super-call structure.
7128 arg0 = CGF.Builder.CreateBitCast(arg0, ObjCTypes.ObjectPtrTy);
7129 args.add(RValue::get(arg0), arg0Type);
7131 // Second argument: a pointer to the message ref structure. Leave
7132 // the actual argument value blank for now.
7133 args.add(RValue::get(nullptr), ObjCTypes.MessageRefCPtrTy);
7135 args.insert(args.end(), formalArgs.begin(), formalArgs.end());
7137 MessageSendInfo MSI = getMessageSendInfo(method, resultType, args);
7139 NullReturnState nullReturn;
7141 // Find the function to call and the mangled name for the message
7142 // ref structure. Using a different mangled name wouldn't actually
7143 // be a problem; it would just be a waste.
7145 // The runtime currently never uses vtable dispatch for anything
7146 // except normal, non-super message-sends.
7147 // FIXME: don't use this for that.
7148 llvm::FunctionCallee fn = nullptr;
7149 std::string messageRefName("_");
7150 if (CGM.ReturnSlotInterferesWithArgs(MSI.CallInfo)) {
7152 fn = ObjCTypes.getMessageSendSuper2StretFixupFn();
7153 messageRefName += "objc_msgSendSuper2_stret_fixup";
7155 nullReturn.init(CGF, arg0);
7156 fn = ObjCTypes.getMessageSendStretFixupFn();
7157 messageRefName += "objc_msgSend_stret_fixup";
7159 } else if (!isSuper && CGM.ReturnTypeUsesFPRet(resultType)) {
7160 fn = ObjCTypes.getMessageSendFpretFixupFn();
7161 messageRefName += "objc_msgSend_fpret_fixup";
7164 fn = ObjCTypes.getMessageSendSuper2FixupFn();
7165 messageRefName += "objc_msgSendSuper2_fixup";
7167 fn = ObjCTypes.getMessageSendFixupFn();
7168 messageRefName += "objc_msgSend_fixup";
7171 assert(fn && "CGObjCNonFragileABIMac::EmitMessageSend");
7172 messageRefName += '_';
7174 // Append the selector name, except use underscores anywhere we
7175 // would have used colons.
7176 appendSelectorForMessageRefTable(messageRefName, selector);
7178 llvm::GlobalVariable *messageRef
7179 = CGM.getModule().getGlobalVariable(messageRefName);
7181 // Build the message ref structure.
7182 ConstantInitBuilder builder(CGM);
7183 auto values = builder.beginStruct();
7184 values.add(cast<llvm::Constant>(fn.getCallee()));
7185 values.add(GetMethodVarName(selector));
7186 messageRef = values.finishAndCreateGlobal(messageRefName,
7187 CharUnits::fromQuantity(16),
7189 llvm::GlobalValue::WeakAnyLinkage);
7190 messageRef->setVisibility(llvm::GlobalValue::HiddenVisibility);
7191 messageRef->setSection(GetSectionName("__objc_msgrefs", "coalesced"));
7194 bool requiresnullCheck = false;
7195 if (CGM.getLangOpts().ObjCAutoRefCount && method)
7196 for (const auto *ParamDecl : method->parameters()) {
7197 if (ParamDecl->hasAttr<NSConsumedAttr>()) {
7198 if (!nullReturn.NullBB)
7199 nullReturn.init(CGF, arg0);
7200 requiresnullCheck = true;
7206 Address(CGF.Builder.CreateBitCast(messageRef, ObjCTypes.MessageRefPtrTy),
7207 CGF.getPointerAlign());
7209 // Update the message ref argument.
7210 args[1].setRValue(RValue::get(mref.getPointer()));
7212 // Load the function to call from the message ref table.
7213 Address calleeAddr = CGF.Builder.CreateStructGEP(mref, 0);
7214 llvm::Value *calleePtr = CGF.Builder.CreateLoad(calleeAddr, "msgSend_fn");
7216 calleePtr = CGF.Builder.CreateBitCast(calleePtr, MSI.MessengerType);
7217 CGCallee callee(CGCalleeInfo(), calleePtr);
7219 RValue result = CGF.EmitCall(MSI.CallInfo, callee, returnSlot, args);
7220 return nullReturn.complete(CGF, returnSlot, result, resultType, formalArgs,
7221 requiresnullCheck ? method : nullptr);
7224 /// Generate code for a message send expression in the nonfragile abi.
7226 CGObjCNonFragileABIMac::GenerateMessageSend(CodeGen::CodeGenFunction &CGF,
7227 ReturnValueSlot Return,
7228 QualType ResultType,
7230 llvm::Value *Receiver,
7231 const CallArgList &CallArgs,
7232 const ObjCInterfaceDecl *Class,
7233 const ObjCMethodDecl *Method) {
7234 return isVTableDispatchedSelector(Sel)
7235 ? EmitVTableMessageSend(CGF, Return, ResultType, Sel,
7236 Receiver, CGF.getContext().getObjCIdType(),
7237 false, CallArgs, Method)
7238 : EmitMessageSend(CGF, Return, ResultType,
7239 EmitSelector(CGF, Sel),
7240 Receiver, CGF.getContext().getObjCIdType(),
7241 false, CallArgs, Method, Class, ObjCTypes);
7245 CGObjCNonFragileABIMac::GetClassGlobal(const ObjCInterfaceDecl *ID,
7247 ForDefinition_t isForDefinition) {
7249 (metaclass ? getMetaclassSymbolPrefix() : getClassSymbolPrefix());
7250 return GetClassGlobal((prefix + ID->getObjCRuntimeNameAsString()).str(),
7252 ID->isWeakImported(),
7254 && CGM.getTriple().isOSBinFormatCOFF()
7255 && ID->hasAttr<DLLImportAttr>());
7259 CGObjCNonFragileABIMac::GetClassGlobal(StringRef Name,
7260 ForDefinition_t IsForDefinition,
7261 bool Weak, bool DLLImport) {
7262 llvm::GlobalValue::LinkageTypes L =
7263 Weak ? llvm::GlobalValue::ExternalWeakLinkage
7264 : llvm::GlobalValue::ExternalLinkage;
7266 llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name);
7267 if (!GV || GV->getType() != ObjCTypes.ClassnfABITy->getPointerTo()) {
7268 auto *NewGV = new llvm::GlobalVariable(ObjCTypes.ClassnfABITy, false, L,
7272 NewGV->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
7275 GV->replaceAllUsesWith(
7276 llvm::ConstantExpr::getBitCast(NewGV, GV->getType()));
7277 GV->eraseFromParent();
7280 CGM.getModule().getGlobalList().push_back(GV);
7283 assert(GV->getLinkage() == L);
7288 CGObjCNonFragileABIMac::GetClassGlobalForClassRef(const ObjCInterfaceDecl *ID) {
7289 llvm::Constant *ClassGV = GetClassGlobal(ID, /*metaclass*/ false,
7292 if (!ID->hasAttr<ObjCClassStubAttr>())
7295 ClassGV = llvm::ConstantExpr::getPointerCast(ClassGV, ObjCTypes.Int8PtrTy);
7297 // Stub classes are pointer-aligned. Classrefs pointing at stub classes
7298 // must set the least significant bit set to 1.
7299 auto *Idx = llvm::ConstantInt::get(CGM.Int32Ty, 1);
7300 return llvm::ConstantExpr::getGetElementPtr(CGM.Int8Ty, ClassGV, Idx);
7304 CGObjCNonFragileABIMac::EmitLoadOfClassRef(CodeGenFunction &CGF,
7305 const ObjCInterfaceDecl *ID,
7306 llvm::GlobalVariable *Entry) {
7307 if (ID && ID->hasAttr<ObjCClassStubAttr>()) {
7308 // Classrefs pointing at Objective-C stub classes must be loaded by calling
7309 // a special runtime function.
7310 return CGF.EmitRuntimeCall(
7311 ObjCTypes.getLoadClassrefFn(), Entry, "load_classref_result");
7314 CharUnits Align = CGF.getPointerAlign();
7315 return CGF.Builder.CreateAlignedLoad(Entry, Align);
7319 CGObjCNonFragileABIMac::EmitClassRefFromId(CodeGenFunction &CGF,
7321 const ObjCInterfaceDecl *ID) {
7322 llvm::GlobalVariable *&Entry = ClassReferences[II];
7325 llvm::Constant *ClassGV;
7327 ClassGV = GetClassGlobalForClassRef(ID);
7329 ClassGV = GetClassGlobal((getClassSymbolPrefix() + II->getName()).str(),
7331 assert(ClassGV->getType() == ObjCTypes.ClassnfABIPtrTy &&
7332 "classref was emitted with the wrong type?");
7335 std::string SectionName =
7336 GetSectionName("__objc_classrefs", "regular,no_dead_strip");
7337 Entry = new llvm::GlobalVariable(
7338 CGM.getModule(), ClassGV->getType(), false,
7339 getLinkageTypeForObjCMetadata(CGM, SectionName), ClassGV,
7340 "OBJC_CLASSLIST_REFERENCES_$_");
7341 Entry->setAlignment(CGF.getPointerAlign().getQuantity());
7342 if (!ID || !ID->hasAttr<ObjCClassStubAttr>())
7343 Entry->setSection(SectionName);
7345 CGM.addCompilerUsedGlobal(Entry);
7348 return EmitLoadOfClassRef(CGF, ID, Entry);
7351 llvm::Value *CGObjCNonFragileABIMac::EmitClassRef(CodeGenFunction &CGF,
7352 const ObjCInterfaceDecl *ID) {
7353 // If the class has the objc_runtime_visible attribute, we need to
7354 // use the Objective-C runtime to get the class.
7355 if (ID->hasAttr<ObjCRuntimeVisibleAttr>())
7356 return EmitClassRefViaRuntime(CGF, ID, ObjCTypes);
7358 return EmitClassRefFromId(CGF, ID->getIdentifier(), ID);
7361 llvm::Value *CGObjCNonFragileABIMac::EmitNSAutoreleasePoolClassRef(
7362 CodeGenFunction &CGF) {
7363 IdentifierInfo *II = &CGM.getContext().Idents.get("NSAutoreleasePool");
7364 return EmitClassRefFromId(CGF, II, nullptr);
7368 CGObjCNonFragileABIMac::EmitSuperClassRef(CodeGenFunction &CGF,
7369 const ObjCInterfaceDecl *ID) {
7370 llvm::GlobalVariable *&Entry = SuperClassReferences[ID->getIdentifier()];
7373 llvm::Constant *ClassGV = GetClassGlobalForClassRef(ID);
7374 std::string SectionName =
7375 GetSectionName("__objc_superrefs", "regular,no_dead_strip");
7376 Entry = new llvm::GlobalVariable(
7377 CGM.getModule(), ClassGV->getType(), false,
7378 getLinkageTypeForObjCMetadata(CGM, SectionName), ClassGV,
7379 "OBJC_CLASSLIST_SUP_REFS_$_");
7380 Entry->setAlignment(CGF.getPointerAlign().getQuantity());
7381 Entry->setSection(SectionName);
7382 CGM.addCompilerUsedGlobal(Entry);
7385 return EmitLoadOfClassRef(CGF, ID, Entry);
7388 /// EmitMetaClassRef - Return a Value * of the address of _class_t
7391 llvm::Value *CGObjCNonFragileABIMac::EmitMetaClassRef(CodeGenFunction &CGF,
7392 const ObjCInterfaceDecl *ID,
7394 CharUnits Align = CGF.getPointerAlign();
7395 llvm::GlobalVariable * &Entry = MetaClassReferences[ID->getIdentifier()];
7397 auto MetaClassGV = GetClassGlobal(ID, /*metaclass*/ true, NotForDefinition);
7398 std::string SectionName =
7399 GetSectionName("__objc_superrefs", "regular,no_dead_strip");
7400 Entry = new llvm::GlobalVariable(
7401 CGM.getModule(), ObjCTypes.ClassnfABIPtrTy, false,
7402 getLinkageTypeForObjCMetadata(CGM, SectionName), MetaClassGV,
7403 "OBJC_CLASSLIST_SUP_REFS_$_");
7404 Entry->setAlignment(Align.getQuantity());
7405 Entry->setSection(SectionName);
7406 CGM.addCompilerUsedGlobal(Entry);
7409 return CGF.Builder.CreateAlignedLoad(Entry, Align);
7412 /// GetClass - Return a reference to the class for the given interface
7414 llvm::Value *CGObjCNonFragileABIMac::GetClass(CodeGenFunction &CGF,
7415 const ObjCInterfaceDecl *ID) {
7416 if (ID->isWeakImported()) {
7417 auto ClassGV = GetClassGlobal(ID, /*metaclass*/ false, NotForDefinition);
7419 assert(!isa<llvm::GlobalVariable>(ClassGV) ||
7420 cast<llvm::GlobalVariable>(ClassGV)->hasExternalWeakLinkage());
7423 return EmitClassRef(CGF, ID);
7426 /// Generates a message send where the super is the receiver. This is
7427 /// a message send to self with special delivery semantics indicating
7428 /// which class's method should be called.
7430 CGObjCNonFragileABIMac::GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF,
7431 ReturnValueSlot Return,
7432 QualType ResultType,
7434 const ObjCInterfaceDecl *Class,
7435 bool isCategoryImpl,
7436 llvm::Value *Receiver,
7437 bool IsClassMessage,
7438 const CodeGen::CallArgList &CallArgs,
7439 const ObjCMethodDecl *Method) {
7441 // Create and init a super structure; this is a (receiver, class)
7442 // pair we will pass to objc_msgSendSuper.
7444 CGF.CreateTempAlloca(ObjCTypes.SuperTy, CGF.getPointerAlign(),
7447 llvm::Value *ReceiverAsObject =
7448 CGF.Builder.CreateBitCast(Receiver, ObjCTypes.ObjectPtrTy);
7449 CGF.Builder.CreateStore(ReceiverAsObject,
7450 CGF.Builder.CreateStructGEP(ObjCSuper, 0));
7452 // If this is a class message the metaclass is passed as the target.
7453 llvm::Value *Target;
7455 Target = EmitMetaClassRef(CGF, Class, Class->isWeakImported());
7457 Target = EmitSuperClassRef(CGF, Class);
7459 // FIXME: We shouldn't need to do this cast, rectify the ASTContext and
7461 llvm::Type *ClassTy =
7462 CGM.getTypes().ConvertType(CGF.getContext().getObjCClassType());
7463 Target = CGF.Builder.CreateBitCast(Target, ClassTy);
7464 CGF.Builder.CreateStore(Target, CGF.Builder.CreateStructGEP(ObjCSuper, 1));
7466 return (isVTableDispatchedSelector(Sel))
7467 ? EmitVTableMessageSend(CGF, Return, ResultType, Sel,
7468 ObjCSuper.getPointer(), ObjCTypes.SuperPtrCTy,
7469 true, CallArgs, Method)
7470 : EmitMessageSend(CGF, Return, ResultType,
7471 EmitSelector(CGF, Sel),
7472 ObjCSuper.getPointer(), ObjCTypes.SuperPtrCTy,
7473 true, CallArgs, Method, Class, ObjCTypes);
7476 llvm::Value *CGObjCNonFragileABIMac::EmitSelector(CodeGenFunction &CGF,
7478 Address Addr = EmitSelectorAddr(CGF, Sel);
7480 llvm::LoadInst* LI = CGF.Builder.CreateLoad(Addr);
7481 LI->setMetadata(CGM.getModule().getMDKindID("invariant.load"),
7482 llvm::MDNode::get(VMContext, None));
7486 Address CGObjCNonFragileABIMac::EmitSelectorAddr(CodeGenFunction &CGF,
7488 llvm::GlobalVariable *&Entry = SelectorReferences[Sel];
7490 CharUnits Align = CGF.getPointerAlign();
7492 llvm::Constant *Casted =
7493 llvm::ConstantExpr::getBitCast(GetMethodVarName(Sel),
7494 ObjCTypes.SelectorPtrTy);
7495 std::string SectionName =
7496 GetSectionName("__objc_selrefs", "literal_pointers,no_dead_strip");
7497 Entry = new llvm::GlobalVariable(
7498 CGM.getModule(), ObjCTypes.SelectorPtrTy, false,
7499 getLinkageTypeForObjCMetadata(CGM, SectionName), Casted,
7500 "OBJC_SELECTOR_REFERENCES_");
7501 Entry->setExternallyInitialized(true);
7502 Entry->setSection(SectionName);
7503 Entry->setAlignment(Align.getQuantity());
7504 CGM.addCompilerUsedGlobal(Entry);
7507 return Address(Entry, Align);
7510 /// EmitObjCIvarAssign - Code gen for assigning to a __strong object.
7511 /// objc_assign_ivar (id src, id *dst, ptrdiff_t)
7513 void CGObjCNonFragileABIMac::EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF,
7516 llvm::Value *ivarOffset) {
7517 llvm::Type * SrcTy = src->getType();
7518 if (!isa<llvm::PointerType>(SrcTy)) {
7519 unsigned Size = CGM.getDataLayout().getTypeAllocSize(SrcTy);
7520 assert(Size <= 8 && "does not support size > 8");
7521 src = (Size == 4 ? CGF.Builder.CreateBitCast(src, ObjCTypes.IntTy)
7522 : CGF.Builder.CreateBitCast(src, ObjCTypes.LongTy));
7523 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy);
7525 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy);
7526 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy);
7527 llvm::Value *args[] = { src, dst.getPointer(), ivarOffset };
7528 CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignIvarFn(), args);
7531 /// EmitObjCStrongCastAssign - Code gen for assigning to a __strong cast object.
7532 /// objc_assign_strongCast (id src, id *dst)
7534 void CGObjCNonFragileABIMac::EmitObjCStrongCastAssign(
7535 CodeGen::CodeGenFunction &CGF,
7536 llvm::Value *src, Address dst) {
7537 llvm::Type * SrcTy = src->getType();
7538 if (!isa<llvm::PointerType>(SrcTy)) {
7539 unsigned Size = CGM.getDataLayout().getTypeAllocSize(SrcTy);
7540 assert(Size <= 8 && "does not support size > 8");
7541 src = (Size == 4 ? CGF.Builder.CreateBitCast(src, ObjCTypes.IntTy)
7542 : CGF.Builder.CreateBitCast(src, ObjCTypes.LongTy));
7543 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy);
7545 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy);
7546 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy);
7547 llvm::Value *args[] = { src, dst.getPointer() };
7548 CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignStrongCastFn(),
7549 args, "weakassign");
7552 void CGObjCNonFragileABIMac::EmitGCMemmoveCollectable(
7553 CodeGen::CodeGenFunction &CGF,
7556 llvm::Value *Size) {
7557 SrcPtr = CGF.Builder.CreateBitCast(SrcPtr, ObjCTypes.Int8PtrTy);
7558 DestPtr = CGF.Builder.CreateBitCast(DestPtr, ObjCTypes.Int8PtrTy);
7559 llvm::Value *args[] = { DestPtr.getPointer(), SrcPtr.getPointer(), Size };
7560 CGF.EmitNounwindRuntimeCall(ObjCTypes.GcMemmoveCollectableFn(), args);
7563 /// EmitObjCWeakRead - Code gen for loading value of a __weak
7564 /// object: objc_read_weak (id *src)
7566 llvm::Value * CGObjCNonFragileABIMac::EmitObjCWeakRead(
7567 CodeGen::CodeGenFunction &CGF,
7568 Address AddrWeakObj) {
7569 llvm::Type *DestTy = AddrWeakObj.getElementType();
7570 AddrWeakObj = CGF.Builder.CreateBitCast(AddrWeakObj, ObjCTypes.PtrObjectPtrTy);
7571 llvm::Value *read_weak =
7572 CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcReadWeakFn(),
7573 AddrWeakObj.getPointer(), "weakread");
7574 read_weak = CGF.Builder.CreateBitCast(read_weak, DestTy);
7578 /// EmitObjCWeakAssign - Code gen for assigning to a __weak object.
7579 /// objc_assign_weak (id src, id *dst)
7581 void CGObjCNonFragileABIMac::EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF,
7582 llvm::Value *src, Address dst) {
7583 llvm::Type * SrcTy = src->getType();
7584 if (!isa<llvm::PointerType>(SrcTy)) {
7585 unsigned Size = CGM.getDataLayout().getTypeAllocSize(SrcTy);
7586 assert(Size <= 8 && "does not support size > 8");
7587 src = (Size == 4 ? CGF.Builder.CreateBitCast(src, ObjCTypes.IntTy)
7588 : CGF.Builder.CreateBitCast(src, ObjCTypes.LongTy));
7589 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy);
7591 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy);
7592 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy);
7593 llvm::Value *args[] = { src, dst.getPointer() };
7594 CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignWeakFn(),
7595 args, "weakassign");
7598 /// EmitObjCGlobalAssign - Code gen for assigning to a __strong object.
7599 /// objc_assign_global (id src, id *dst)
7601 void CGObjCNonFragileABIMac::EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF,
7602 llvm::Value *src, Address dst,
7604 llvm::Type * SrcTy = src->getType();
7605 if (!isa<llvm::PointerType>(SrcTy)) {
7606 unsigned Size = CGM.getDataLayout().getTypeAllocSize(SrcTy);
7607 assert(Size <= 8 && "does not support size > 8");
7608 src = (Size == 4 ? CGF.Builder.CreateBitCast(src, ObjCTypes.IntTy)
7609 : CGF.Builder.CreateBitCast(src, ObjCTypes.LongTy));
7610 src = CGF.Builder.CreateIntToPtr(src, ObjCTypes.Int8PtrTy);
7612 src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy);
7613 dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy);
7614 llvm::Value *args[] = { src, dst.getPointer() };
7616 CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignGlobalFn(),
7617 args, "globalassign");
7619 CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignThreadLocalFn(),
7620 args, "threadlocalassign");
7624 CGObjCNonFragileABIMac::EmitSynchronizedStmt(CodeGen::CodeGenFunction &CGF,
7625 const ObjCAtSynchronizedStmt &S) {
7626 EmitAtSynchronizedStmt(CGF, S, ObjCTypes.getSyncEnterFn(),
7627 ObjCTypes.getSyncExitFn());
7631 CGObjCNonFragileABIMac::GetEHType(QualType T) {
7632 // There's a particular fixed type info for 'id'.
7633 if (T->isObjCIdType() || T->isObjCQualifiedIdType()) {
7634 auto *IDEHType = CGM.getModule().getGlobalVariable("OBJC_EHTYPE_id");
7637 new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.EHTypeTy, false,
7638 llvm::GlobalValue::ExternalLinkage, nullptr,
7640 if (CGM.getTriple().isOSBinFormatCOFF())
7641 IDEHType->setDLLStorageClass(getStorage(CGM, "OBJC_EHTYPE_id"));
7646 // All other types should be Objective-C interface pointer types.
7647 const ObjCObjectPointerType *PT = T->getAs<ObjCObjectPointerType>();
7648 assert(PT && "Invalid @catch type.");
7650 const ObjCInterfaceType *IT = PT->getInterfaceType();
7651 assert(IT && "Invalid @catch type.");
7653 return GetInterfaceEHType(IT->getDecl(), NotForDefinition);
7656 void CGObjCNonFragileABIMac::EmitTryStmt(CodeGen::CodeGenFunction &CGF,
7657 const ObjCAtTryStmt &S) {
7658 EmitTryCatchStmt(CGF, S, ObjCTypes.getObjCBeginCatchFn(),
7659 ObjCTypes.getObjCEndCatchFn(),
7660 ObjCTypes.getExceptionRethrowFn());
7663 /// EmitThrowStmt - Generate code for a throw statement.
7664 void CGObjCNonFragileABIMac::EmitThrowStmt(CodeGen::CodeGenFunction &CGF,
7665 const ObjCAtThrowStmt &S,
7666 bool ClearInsertionPoint) {
7667 if (const Expr *ThrowExpr = S.getThrowExpr()) {
7668 llvm::Value *Exception = CGF.EmitObjCThrowOperand(ThrowExpr);
7669 Exception = CGF.Builder.CreateBitCast(Exception, ObjCTypes.ObjectPtrTy);
7670 llvm::CallBase *Call =
7671 CGF.EmitRuntimeCallOrInvoke(ObjCTypes.getExceptionThrowFn(), Exception);
7672 Call->setDoesNotReturn();
7674 llvm::CallBase *Call =
7675 CGF.EmitRuntimeCallOrInvoke(ObjCTypes.getExceptionRethrowFn());
7676 Call->setDoesNotReturn();
7679 CGF.Builder.CreateUnreachable();
7680 if (ClearInsertionPoint)
7681 CGF.Builder.ClearInsertionPoint();
7685 CGObjCNonFragileABIMac::GetInterfaceEHType(const ObjCInterfaceDecl *ID,
7686 ForDefinition_t IsForDefinition) {
7687 llvm::GlobalVariable * &Entry = EHTypeReferences[ID->getIdentifier()];
7688 StringRef ClassName = ID->getObjCRuntimeNameAsString();
7690 // If we don't need a definition, return the entry if found or check
7691 // if we use an external reference.
7692 if (!IsForDefinition) {
7696 // If this type (or a super class) has the __objc_exception__
7697 // attribute, emit an external reference.
7698 if (hasObjCExceptionAttribute(CGM.getContext(), ID)) {
7699 std::string EHTypeName = ("OBJC_EHTYPE_$_" + ClassName).str();
7700 Entry = new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.EHTypeTy,
7701 false, llvm::GlobalValue::ExternalLinkage,
7702 nullptr, EHTypeName);
7703 CGM.setGVProperties(Entry, ID);
7708 // Otherwise we need to either make a new entry or fill in the initializer.
7709 assert((!Entry || !Entry->hasInitializer()) && "Duplicate EHType definition");
7711 std::string VTableName = "objc_ehtype_vtable";
7712 auto *VTableGV = CGM.getModule().getGlobalVariable(VTableName);
7715 new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.Int8PtrTy, false,
7716 llvm::GlobalValue::ExternalLinkage, nullptr,
7718 if (CGM.getTriple().isOSBinFormatCOFF())
7719 VTableGV->setDLLStorageClass(getStorage(CGM, VTableName));
7722 llvm::Value *VTableIdx = llvm::ConstantInt::get(CGM.Int32Ty, 2);
7723 ConstantInitBuilder builder(CGM);
7724 auto values = builder.beginStruct(ObjCTypes.EHTypeTy);
7726 llvm::ConstantExpr::getInBoundsGetElementPtr(VTableGV->getValueType(),
7727 VTableGV, VTableIdx));
7728 values.add(GetClassName(ClassName));
7729 values.add(GetClassGlobal(ID, /*metaclass*/ false, NotForDefinition));
7731 llvm::GlobalValue::LinkageTypes L = IsForDefinition
7732 ? llvm::GlobalValue::ExternalLinkage
7733 : llvm::GlobalValue::WeakAnyLinkage;
7735 values.finishAndSetAsInitializer(Entry);
7736 Entry->setAlignment(CGM.getPointerAlign().getQuantity());
7738 Entry = values.finishAndCreateGlobal("OBJC_EHTYPE_$_" + ClassName,
7739 CGM.getPointerAlign(),
7742 if (hasObjCExceptionAttribute(CGM.getContext(), ID))
7743 CGM.setGVProperties(Entry, ID);
7745 assert(Entry->getLinkage() == L);
7747 if (!CGM.getTriple().isOSBinFormatCOFF())
7748 if (ID->getVisibility() == HiddenVisibility)
7749 Entry->setVisibility(llvm::GlobalValue::HiddenVisibility);
7751 if (IsForDefinition)
7752 if (CGM.getTriple().isOSBinFormatMachO())
7753 Entry->setSection("__DATA,__objc_const");
7760 CodeGen::CGObjCRuntime *
7761 CodeGen::CreateMacObjCRuntime(CodeGen::CodeGenModule &CGM) {
7762 switch (CGM.getLangOpts().ObjCRuntime.getKind()) {
7763 case ObjCRuntime::FragileMacOSX:
7764 return new CGObjCMac(CGM);
7766 case ObjCRuntime::MacOSX:
7767 case ObjCRuntime::iOS:
7768 case ObjCRuntime::WatchOS:
7769 return new CGObjCNonFragileABIMac(CGM);
7771 case ObjCRuntime::GNUstep:
7772 case ObjCRuntime::GCC:
7773 case ObjCRuntime::ObjFW:
7774 llvm_unreachable("these runtimes are not Mac runtimes");
7776 llvm_unreachable("bad runtime");