File: | tools/clang/lib/CodeGen/CGObjCMac.cpp |
Warning: | line 7056, column 27 Called C++ object pointer is null |
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1 | //===------- CGObjCMac.cpp - Interface to Apple Objective-C Runtime -------===// | |||
2 | // | |||
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 | |||
6 | // | |||
7 | //===----------------------------------------------------------------------===// | |||
8 | // | |||
9 | // This provides Objective-C code generation targeting the Apple runtime. | |||
10 | // | |||
11 | //===----------------------------------------------------------------------===// | |||
12 | ||||
13 | #include "CGBlocks.h" | |||
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" | |||
40 | #include <cstdio> | |||
41 | ||||
42 | using namespace clang; | |||
43 | using namespace CodeGen; | |||
44 | ||||
45 | namespace { | |||
46 | ||||
47 | // FIXME: We should find a nicer way to make the labels for metadata, string | |||
48 | // concatenation is lame. | |||
49 | ||||
50 | class ObjCCommonTypesHelper { | |||
51 | protected: | |||
52 | llvm::LLVMContext &VMContext; | |||
53 | ||||
54 | private: | |||
55 | // The types of these functions don't really matter because we | |||
56 | // should always bitcast before calling them. | |||
57 | ||||
58 | /// id objc_msgSend (id, SEL, ...) | |||
59 | /// | |||
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 | |||
64 | // be called a lot. | |||
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)); | |||
71 | } | |||
72 | ||||
73 | /// void objc_msgSend_stret (id, SEL, ...) | |||
74 | /// | |||
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, | |||
81 | params, true), | |||
82 | "objc_msgSend_stret"); | |||
83 | } | |||
84 | ||||
85 | /// [double | long double] objc_msgSend_fpret(id self, SEL op, ...) | |||
86 | /// | |||
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, | |||
93 | params, true), | |||
94 | "objc_msgSend_fpret"); | |||
95 | } | |||
96 | ||||
97 | /// _Complex long double objc_msgSend_fp2ret(id self, SEL op, ...) | |||
98 | /// | |||
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); | |||
107 | ||||
108 | return CGM.CreateRuntimeFunction(llvm::FunctionType::get(resultType, | |||
109 | params, true), | |||
110 | "objc_msgSend_fp2ret"); | |||
111 | } | |||
112 | ||||
113 | /// id objc_msgSendSuper(struct objc_super *super, SEL op, ...) | |||
114 | /// | |||
115 | /// The messenger used for super calls, which have different dispatch | |||
116 | /// semantics. The class passed is the superclass of the current | |||
117 | /// class. | |||
118 | llvm::FunctionCallee getMessageSendSuperFn() const { | |||
119 | llvm::Type *params[] = { SuperPtrTy, SelectorPtrTy }; | |||
120 | return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy, | |||
121 | params, true), | |||
122 | "objc_msgSendSuper"); | |||
123 | } | |||
124 | ||||
125 | /// id objc_msgSendSuper2(struct objc_super *super, SEL op, ...) | |||
126 | /// | |||
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, | |||
132 | params, true), | |||
133 | "objc_msgSendSuper2"); | |||
134 | } | |||
135 | ||||
136 | /// void objc_msgSendSuper_stret(void *stretAddr, struct objc_super *super, | |||
137 | /// SEL op, ...) | |||
138 | /// | |||
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"); | |||
145 | } | |||
146 | ||||
147 | /// void objc_msgSendSuper2_stret(void * stretAddr, struct objc_super *super, | |||
148 | /// SEL op, ...) | |||
149 | /// | |||
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"); | |||
156 | } | |||
157 | ||||
158 | llvm::FunctionCallee getMessageSendSuperFpretFn() const { | |||
159 | // There is no objc_msgSendSuper_fpret? How can that work? | |||
160 | return getMessageSendSuperFn(); | |||
161 | } | |||
162 | ||||
163 | llvm::FunctionCallee getMessageSendSuperFpretFn2() const { | |||
164 | // There is no objc_msgSendSuper_fpret? How can that work? | |||
165 | return getMessageSendSuperFn2(); | |||
166 | } | |||
167 | ||||
168 | protected: | |||
169 | CodeGen::CodeGenModule &CGM; | |||
170 | ||||
171 | public: | |||
172 | llvm::IntegerType *ShortTy, *IntTy, *LongTy; | |||
173 | llvm::PointerType *Int8PtrTy, *Int8PtrPtrTy; | |||
174 | llvm::Type *IvarOffsetVarTy; | |||
175 | ||||
176 | /// ObjectPtrTy - LLVM type for object handles (typeof(id)) | |||
177 | llvm::PointerType *ObjectPtrTy; | |||
178 | ||||
179 | /// PtrObjectPtrTy - LLVM type for id * | |||
180 | llvm::PointerType *PtrObjectPtrTy; | |||
181 | ||||
182 | /// SelectorPtrTy - LLVM type for selector handles (typeof(SEL)) | |||
183 | llvm::PointerType *SelectorPtrTy; | |||
184 | ||||
185 | private: | |||
186 | /// ProtocolPtrTy - LLVM type for external protocol handles | |||
187 | /// (typeof(Protocol)) | |||
188 | llvm::Type *ExternalProtocolPtrTy; | |||
189 | ||||
190 | public: | |||
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); | |||
199 | } | |||
200 | ||||
201 | return ExternalProtocolPtrTy; | |||
202 | } | |||
203 | ||||
204 | // SuperCTy - clang type for struct objc_super. | |||
205 | QualType SuperCTy; | |||
206 | // SuperPtrCTy - clang type for struct objc_super *. | |||
207 | QualType SuperPtrCTy; | |||
208 | ||||
209 | /// SuperTy - LLVM type for struct objc_super. | |||
210 | llvm::StructType *SuperTy; | |||
211 | /// SuperPtrTy - LLVM type for struct objc_super *. | |||
212 | llvm::PointerType *SuperPtrTy; | |||
213 | ||||
214 | /// PropertyTy - LLVM type for struct objc_property (struct _prop_t | |||
215 | /// in GCC parlance). | |||
216 | llvm::StructType *PropertyTy; | |||
217 | ||||
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; | |||
223 | ||||
224 | // MethodTy - LLVM type for struct objc_method. | |||
225 | llvm::StructType *MethodTy; | |||
226 | ||||
227 | /// CacheTy - LLVM type for struct objc_cache. | |||
228 | llvm::Type *CacheTy; | |||
229 | /// CachePtrTy - LLVM type for struct objc_cache *. | |||
230 | llvm::PointerType *CachePtrTy; | |||
231 | ||||
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[] = { | |||
239 | IdType, SelType, | |||
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"); | |||
245 | } | |||
246 | ||||
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[] = { | |||
254 | IdType, | |||
255 | SelType, | |||
256 | Ctx.getPointerDiffType()->getCanonicalTypeUnqualified(), | |||
257 | IdType, | |||
258 | Ctx.BoolTy, | |||
259 | Ctx.BoolTy}; | |||
260 | llvm::FunctionType *FTy = | |||
261 | Types.GetFunctionType( | |||
262 | Types.arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, Params)); | |||
263 | return CGM.CreateRuntimeFunction(FTy, "objc_setProperty"); | |||
264 | } | |||
265 | ||||
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); | |||
277 | ||||
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)); | |||
288 | const char *name; | |||
289 | if (atomic && copy) | |||
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"; | |||
295 | else | |||
296 | name = "objc_setProperty_nonatomic"; | |||
297 | ||||
298 | return CGM.CreateRuntimeFunction(FTy, name); | |||
299 | } | |||
300 | ||||
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"); | |||
315 | } | |||
316 | ||||
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"); | |||
333 | } | |||
334 | ||||
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"); | |||
345 | } | |||
346 | ||||
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; | |||
352 | Params.push_back( | |||
353 | Ctx.getCanonicalType(Ctx.getPointerType(Ctx.CharTy.withConst()))); | |||
354 | llvm::FunctionType *FTy = | |||
355 | Types.GetFunctionType(Types.arrangeBuiltinFunctionDeclaration( | |||
356 | Ctx.getCanonicalType(Ctx.getObjCClassType()), | |||
357 | Params)); | |||
358 | return CGM.CreateRuntimeFunction(FTy, "objc_lookUpClass"); | |||
359 | } | |||
360 | ||||
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"); | |||
368 | } | |||
369 | ||||
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"); | |||
377 | } | |||
378 | ||||
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"); | |||
386 | } | |||
387 | ||||
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"); | |||
395 | } | |||
396 | ||||
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(), | |||
401 | CGM.PtrDiffTy }; | |||
402 | llvm::FunctionType *FTy = | |||
403 | llvm::FunctionType::get(ObjectPtrTy, args, false); | |||
404 | return CGM.CreateRuntimeFunction(FTy, "objc_assign_ivar"); | |||
405 | } | |||
406 | ||||
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"); | |||
413 | } | |||
414 | ||||
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"); | |||
422 | } | |||
423 | ||||
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"); | |||
431 | } | |||
432 | ||||
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"); | |||
438 | } | |||
439 | ||||
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"); | |||
447 | } | |||
448 | ||||
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"); | |||
456 | } | |||
457 | ||||
458 | llvm::FunctionCallee getSendFn(bool IsSuper) const { | |||
459 | return IsSuper ? getMessageSendSuperFn() : getMessageSendFn(); | |||
460 | } | |||
461 | ||||
462 | llvm::FunctionCallee getSendFn2(bool IsSuper) const { | |||
463 | return IsSuper ? getMessageSendSuperFn2() : getMessageSendFn(); | |||
464 | } | |||
465 | ||||
466 | llvm::FunctionCallee getSendStretFn(bool IsSuper) const { | |||
467 | return IsSuper ? getMessageSendSuperStretFn() : getMessageSendStretFn(); | |||
468 | } | |||
469 | ||||
470 | llvm::FunctionCallee getSendStretFn2(bool IsSuper) const { | |||
471 | return IsSuper ? getMessageSendSuperStretFn2() : getMessageSendStretFn(); | |||
472 | } | |||
473 | ||||
474 | llvm::FunctionCallee getSendFpretFn(bool IsSuper) const { | |||
475 | return IsSuper ? getMessageSendSuperFpretFn() : getMessageSendFpretFn(); | |||
476 | } | |||
477 | ||||
478 | llvm::FunctionCallee getSendFpretFn2(bool IsSuper) const { | |||
479 | return IsSuper ? getMessageSendSuperFpretFn2() : getMessageSendFpretFn(); | |||
480 | } | |||
481 | ||||
482 | llvm::FunctionCallee getSendFp2retFn(bool IsSuper) const { | |||
483 | return IsSuper ? getMessageSendSuperFn() : getMessageSendFp2retFn(); | |||
484 | } | |||
485 | ||||
486 | llvm::FunctionCallee getSendFp2RetFn2(bool IsSuper) const { | |||
487 | return IsSuper ? getMessageSendSuperFn2() : getMessageSendFp2retFn(); | |||
488 | } | |||
489 | ||||
490 | ObjCCommonTypesHelper(CodeGen::CodeGenModule &cgm); | |||
491 | }; | |||
492 | ||||
493 | /// ObjCTypesHelper - Helper class that encapsulates lazy | |||
494 | /// construction of varies types used during ObjC generation. | |||
495 | class ObjCTypesHelper : public ObjCCommonTypesHelper { | |||
496 | public: | |||
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; | |||
503 | ||||
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; | |||
547 | ||||
548 | /// ExceptionDataTy - LLVM type for struct _objc_exception_data. | |||
549 | llvm::StructType *ExceptionDataTy; | |||
550 | ||||
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"); | |||
557 | } | |||
558 | ||||
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"); | |||
565 | } | |||
566 | ||||
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, | |||
571 | params, false), | |||
572 | "objc_exception_extract"); | |||
573 | } | |||
574 | ||||
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"); | |||
581 | } | |||
582 | ||||
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)); | |||
592 | } | |||
593 | ||||
594 | public: | |||
595 | ObjCTypesHelper(CodeGen::CodeGenModule &cgm); | |||
596 | }; | |||
597 | ||||
598 | /// ObjCNonFragileABITypesHelper - will have all types needed by objective-c's | |||
599 | /// modern abi | |||
600 | class ObjCNonFragileABITypesHelper : public ObjCCommonTypesHelper { | |||
601 | public: | |||
602 | // MethodListnfABITy - LLVM for struct _method_list_t | |||
603 | llvm::StructType *MethodListnfABITy; | |||
604 | ||||
605 | // MethodListnfABIPtrTy - LLVM for struct _method_list_t* | |||
606 | llvm::PointerType *MethodListnfABIPtrTy; | |||
607 | ||||
608 | // ProtocolnfABITy = LLVM for struct _protocol_t | |||
609 | llvm::StructType *ProtocolnfABITy; | |||
610 | ||||
611 | // ProtocolnfABIPtrTy = LLVM for struct _protocol_t* | |||
612 | llvm::PointerType *ProtocolnfABIPtrTy; | |||
613 | ||||
614 | // ProtocolListnfABITy - LLVM for struct _objc_protocol_list | |||
615 | llvm::StructType *ProtocolListnfABITy; | |||
616 | ||||
617 | // ProtocolListnfABIPtrTy - LLVM for struct _objc_protocol_list* | |||
618 | llvm::PointerType *ProtocolListnfABIPtrTy; | |||
619 | ||||
620 | // ClassnfABITy - LLVM for struct _class_t | |||
621 | llvm::StructType *ClassnfABITy; | |||
622 | ||||
623 | // ClassnfABIPtrTy - LLVM for struct _class_t* | |||
624 | llvm::PointerType *ClassnfABIPtrTy; | |||
625 | ||||
626 | // IvarnfABITy - LLVM for struct _ivar_t | |||
627 | llvm::StructType *IvarnfABITy; | |||
628 | ||||
629 | // IvarListnfABITy - LLVM for struct _ivar_list_t | |||
630 | llvm::StructType *IvarListnfABITy; | |||
631 | ||||
632 | // IvarListnfABIPtrTy = LLVM for struct _ivar_list_t* | |||
633 | llvm::PointerType *IvarListnfABIPtrTy; | |||
634 | ||||
635 | // ClassRonfABITy - LLVM for struct _class_ro_t | |||
636 | llvm::StructType *ClassRonfABITy; | |||
637 | ||||
638 | // ImpnfABITy - LLVM for id (*)(id, SEL, ...) | |||
639 | llvm::PointerType *ImpnfABITy; | |||
640 | ||||
641 | // CategorynfABITy - LLVM for struct _category_t | |||
642 | llvm::StructType *CategorynfABITy; | |||
643 | ||||
644 | // New types for nonfragile abi messaging. | |||
645 | ||||
646 | // MessageRefTy - LLVM for: | |||
647 | // struct _message_ref_t { | |||
648 | // IMP messenger; | |||
649 | // SEL name; | |||
650 | // }; | |||
651 | llvm::StructType *MessageRefTy; | |||
652 | // MessageRefCTy - clang type for struct _message_ref_t | |||
653 | QualType MessageRefCTy; | |||
654 | ||||
655 | // MessageRefPtrTy - LLVM for struct _message_ref_t* | |||
656 | llvm::Type *MessageRefPtrTy; | |||
657 | // MessageRefCPtrTy - clang type for struct _message_ref_t* | |||
658 | QualType MessageRefCPtrTy; | |||
659 | ||||
660 | // SuperMessageRefTy - LLVM for: | |||
661 | // struct _super_message_ref_t { | |||
662 | // SUPER_IMP messenger; | |||
663 | // SEL name; | |||
664 | // }; | |||
665 | llvm::StructType *SuperMessageRefTy; | |||
666 | ||||
667 | // SuperMessageRefPtrTy - LLVM for struct _super_message_ref_t* | |||
668 | llvm::PointerType *SuperMessageRefPtrTy; | |||
669 | ||||
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, | |||
674 | params, true), | |||
675 | "objc_msgSend_fixup"); | |||
676 | } | |||
677 | ||||
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, | |||
682 | params, true), | |||
683 | "objc_msgSend_fpret_fixup"); | |||
684 | } | |||
685 | ||||
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, | |||
690 | params, true), | |||
691 | "objc_msgSend_stret_fixup"); | |||
692 | } | |||
693 | ||||
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, | |||
699 | params, true), | |||
700 | "objc_msgSendSuper2_fixup"); | |||
701 | } | |||
702 | ||||
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, | |||
708 | params, true), | |||
709 | "objc_msgSendSuper2_stret_fixup"); | |||
710 | } | |||
711 | ||||
712 | llvm::FunctionCallee getObjCEndCatchFn() { | |||
713 | return CGM.CreateRuntimeFunction(llvm::FunctionType::get(CGM.VoidTy, false), | |||
714 | "objc_end_catch"); | |||
715 | } | |||
716 | ||||
717 | llvm::FunctionCallee getObjCBeginCatchFn() { | |||
718 | llvm::Type *params[] = { Int8PtrTy }; | |||
719 | return CGM.CreateRuntimeFunction(llvm::FunctionType::get(Int8PtrTy, | |||
720 | params, false), | |||
721 | "objc_begin_catch"); | |||
722 | } | |||
723 | ||||
724 | /// Class objc_loadClassref (void *) | |||
725 | /// | |||
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 | |||
731 | // be called a lot. | |||
732 | // | |||
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), | |||
738 | "objc_loadClassref", | |||
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); | |||
747 | ||||
748 | return F; | |||
749 | } | |||
750 | ||||
751 | llvm::StructType *EHTypeTy; | |||
752 | llvm::Type *EHTypePtrTy; | |||
753 | ||||
754 | ObjCNonFragileABITypesHelper(CodeGen::CodeGenModule &cgm); | |||
755 | }; | |||
756 | ||||
757 | enum class ObjCLabelType { | |||
758 | ClassName, | |||
759 | MethodVarName, | |||
760 | MethodVarType, | |||
761 | PropertyName, | |||
762 | }; | |||
763 | ||||
764 | class CGObjCCommonMac : public CodeGen::CGObjCRuntime { | |||
765 | public: | |||
766 | class SKIP_SCAN { | |||
767 | public: | |||
768 | unsigned skip; | |||
769 | unsigned scan; | |||
770 | SKIP_SCAN(unsigned _skip = 0, unsigned _scan = 0) | |||
771 | : skip(_skip), scan(_scan) {} | |||
772 | }; | |||
773 | ||||
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). | |||
777 | /// | |||
778 | enum BLOCK_LAYOUT_OPCODE { | |||
779 | /// An operator which affects how the following layout should be | |||
780 | /// interpreted. | |||
781 | /// I == 0: Halt interpretation and treat everything else as | |||
782 | /// a non-pointer. Note that this instruction is equal | |||
783 | /// to '\0'. | |||
784 | /// I != 0: Currently unused. | |||
785 | BLOCK_LAYOUT_OPERATOR = 0, | |||
786 | ||||
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, | |||
792 | ||||
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, | |||
797 | ||||
798 | /// The next I+1 words are __strong pointers to Objective-C | |||
799 | /// objects or blocks. | |||
800 | BLOCK_LAYOUT_STRONG = 3, | |||
801 | ||||
802 | /// The next I+1 words are pointers to __block variables. | |||
803 | BLOCK_LAYOUT_BYREF = 4, | |||
804 | ||||
805 | /// The next I+1 words are __weak pointers to Objective-C | |||
806 | /// objects or blocks. | |||
807 | BLOCK_LAYOUT_WEAK = 5, | |||
808 | ||||
809 | /// The next I+1 words are __unsafe_unretained pointers to | |||
810 | /// Objective-C objects or blocks. | |||
811 | BLOCK_LAYOUT_UNRETAINED = 6 | |||
812 | ||||
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 | |||
816 | /// this range. | |||
817 | /// | |||
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, | |||
821 | ||||
822 | /// All other opcodes are reserved. Halt interpretation and | |||
823 | /// treat everything else as opaque. | |||
824 | }; | |||
825 | ||||
826 | class RUN_SKIP { | |||
827 | public: | |||
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) {} | |||
835 | ||||
836 | // Allow sorting based on byte pos. | |||
837 | bool operator<(const RUN_SKIP &b) const { | |||
838 | return block_var_bytepos < b.block_var_bytepos; | |||
839 | } | |||
840 | }; | |||
841 | ||||
842 | protected: | |||
843 | llvm::LLVMContext &VMContext; | |||
844 | // FIXME! May not be needing this after all. | |||
845 | unsigned ObjCABI; | |||
846 | ||||
847 | // arc/mrr layout of captured block literal variables. | |||
848 | SmallVector<RUN_SKIP, 16> RunSkipBlockVars; | |||
849 | ||||
850 | /// LazySymbols - Symbols to generate a lazy reference for. See | |||
851 | /// DefinedSymbols and FinishModule(). | |||
852 | llvm::SetVector<IdentifierInfo*> LazySymbols; | |||
853 | ||||
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 | |||
857 | /// linked properly. | |||
858 | llvm::SetVector<IdentifierInfo*> DefinedSymbols; | |||
859 | ||||
860 | /// ClassNames - uniqued class names. | |||
861 | llvm::StringMap<llvm::GlobalVariable*> ClassNames; | |||
862 | ||||
863 | /// MethodVarNames - uniqued method variable names. | |||
864 | llvm::DenseMap<Selector, llvm::GlobalVariable*> MethodVarNames; | |||
865 | ||||
866 | /// DefinedCategoryNames - list of category names in form Class_Category. | |||
867 | llvm::SmallSetVector<llvm::CachedHashString, 16> DefinedCategoryNames; | |||
868 | ||||
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; | |||
872 | ||||
873 | /// MethodDefinitions - map of methods which have been defined in | |||
874 | /// this translation unit. | |||
875 | llvm::DenseMap<const ObjCMethodDecl*, llvm::Function*> MethodDefinitions; | |||
876 | ||||
877 | /// PropertyNames - uniqued method variable names. | |||
878 | llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> PropertyNames; | |||
879 | ||||
880 | /// ClassReferences - uniqued class references. | |||
881 | llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> ClassReferences; | |||
882 | ||||
883 | /// SelectorReferences - uniqued selector references. | |||
884 | llvm::DenseMap<Selector, llvm::GlobalVariable*> SelectorReferences; | |||
885 | ||||
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; | |||
890 | ||||
891 | /// DefinedProtocols - Protocols which have actually been | |||
892 | /// defined. We should not need this, see FIXME in GenerateProtocol. | |||
893 | llvm::DenseSet<IdentifierInfo*> DefinedProtocols; | |||
894 | ||||
895 | /// DefinedClasses - List of defined classes. | |||
896 | SmallVector<llvm::GlobalValue*, 16> DefinedClasses; | |||
897 | ||||
898 | /// ImplementedClasses - List of @implemented classes. | |||
899 | SmallVector<const ObjCInterfaceDecl*, 16> ImplementedClasses; | |||
900 | ||||
901 | /// DefinedNonLazyClasses - List of defined "non-lazy" classes. | |||
902 | SmallVector<llvm::GlobalValue*, 16> DefinedNonLazyClasses; | |||
903 | ||||
904 | /// DefinedCategories - List of defined categories. | |||
905 | SmallVector<llvm::GlobalValue*, 16> DefinedCategories; | |||
906 | ||||
907 | /// DefinedStubCategories - List of defined categories on class stubs. | |||
908 | SmallVector<llvm::GlobalValue*, 16> DefinedStubCategories; | |||
909 | ||||
910 | /// DefinedNonLazyCategories - List of defined "non-lazy" categories. | |||
911 | SmallVector<llvm::GlobalValue*, 16> DefinedNonLazyCategories; | |||
912 | ||||
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; | |||
916 | ||||
917 | /// The LLVM type corresponding to NSConstantString. | |||
918 | llvm::StructType *NSConstantStringType = nullptr; | |||
919 | ||||
920 | llvm::StringMap<llvm::GlobalVariable *> NSConstantStringMap; | |||
921 | ||||
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); | |||
927 | ||||
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); | |||
932 | ||||
933 | /// GetMethodVarType - Return a unique constant for the given | |||
934 | /// method's type encoding string. The return value has type char *. | |||
935 | ||||
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); | |||
940 | ||||
941 | /// GetPropertyName - Return a unique constant for the given | |||
942 | /// name. The return value has type char *. | |||
943 | llvm::Constant *GetPropertyName(IdentifierInfo *Ident); | |||
944 | ||||
945 | // FIXME: This can be dropped once string functions are unified. | |||
946 | llvm::Constant *GetPropertyTypeString(const ObjCPropertyDecl *PD, | |||
947 | const Decl *Container); | |||
948 | ||||
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); | |||
953 | ||||
954 | llvm::Function *GetMethodDefinition(const ObjCMethodDecl *MD); | |||
955 | ||||
956 | /// BuildIvarLayout - Builds ivar layout bitmap for the class | |||
957 | /// implementation for the __strong or __weak case. | |||
958 | /// | |||
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, | |||
965 | CharUnits endOffset, | |||
966 | bool forStrongLayout, | |||
967 | bool hasMRCWeakIvars); | |||
968 | ||||
969 | llvm::Constant *BuildStrongIvarLayout(const ObjCImplementationDecl *OI, | |||
970 | CharUnits beginOffset, | |||
971 | CharUnits endOffset) { | |||
972 | return BuildIvarLayout(OI, beginOffset, endOffset, true, false); | |||
973 | } | |||
974 | ||||
975 | llvm::Constant *BuildWeakIvarLayout(const ObjCImplementationDecl *OI, | |||
976 | CharUnits beginOffset, | |||
977 | CharUnits endOffset, | |||
978 | bool hasMRCWeakIvars) { | |||
979 | return BuildIvarLayout(OI, beginOffset, endOffset, false, hasMRCWeakIvars); | |||
980 | } | |||
981 | ||||
982 | Qualifiers::ObjCLifetime getBlockCaptureLifetime(QualType QT, bool ByrefLayout); | |||
983 | ||||
984 | void UpdateRunSkipBlockVars(bool IsByref, | |||
985 | Qualifiers::ObjCLifetime LifeTime, | |||
986 | CharUnits FieldOffset, | |||
987 | CharUnits FieldSize); | |||
988 | ||||
989 | void BuildRCBlockVarRecordLayout(const RecordType *RT, | |||
990 | CharUnits BytePos, bool &HasUnion, | |||
991 | bool ByrefLayout=false); | |||
992 | ||||
993 | void BuildRCRecordLayout(const llvm::StructLayout *RecLayout, | |||
994 | const RecordDecl *RD, | |||
995 | ArrayRef<const FieldDecl*> RecFields, | |||
996 | CharUnits BytePos, bool &HasUnion, | |||
997 | bool ByrefLayout); | |||
998 | ||||
999 | uint64_t InlineLayoutInstruction(SmallVectorImpl<unsigned char> &Layout); | |||
1000 | ||||
1001 | llvm::Constant *getBitmapBlockLayout(bool ComputeByrefLayout); | |||
1002 | ||||
1003 | /// GetIvarLayoutName - Returns a unique constant for the given | |||
1004 | /// ivar layout bitmap. | |||
1005 | llvm::Constant *GetIvarLayoutName(IdentifierInfo *Ident, | |||
1006 | const ObjCCommonTypesHelper &ObjCTypes); | |||
1007 | ||||
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); | |||
1015 | ||||
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); | |||
1021 | ||||
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); | |||
1026 | ||||
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); | |||
1032 | ||||
1033 | std::string GetSectionName(StringRef Section, StringRef MachOAttributes); | |||
1034 | ||||
1035 | public: | |||
1036 | /// CreateMetadataVar - Create a global variable with internal | |||
1037 | /// linkage for use by the Objective-C runtime. | |||
1038 | /// | |||
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. | |||
1042 | /// | |||
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 | |||
1049 | /// "llvm.used". | |||
1050 | llvm::GlobalVariable *CreateMetadataVar(Twine Name, | |||
1051 | ConstantStructBuilder &Init, | |||
1052 | StringRef Section, CharUnits Align, | |||
1053 | bool AddToUsed); | |||
1054 | llvm::GlobalVariable *CreateMetadataVar(Twine Name, | |||
1055 | llvm::Constant *Init, | |||
1056 | StringRef Section, CharUnits Align, | |||
1057 | bool AddToUsed); | |||
1058 | ||||
1059 | llvm::GlobalVariable *CreateCStringLiteral(StringRef Name, | |||
1060 | ObjCLabelType LabelType, | |||
1061 | bool ForceNonFragileABI = false, | |||
1062 | bool NullTerminate = true); | |||
1063 | ||||
1064 | protected: | |||
1065 | CodeGen::RValue EmitMessageSend(CodeGen::CodeGenFunction &CGF, | |||
1066 | ReturnValueSlot Return, | |||
1067 | QualType ResultType, | |||
1068 | llvm::Value *Sel, | |||
1069 | llvm::Value *Arg0, | |||
1070 | QualType Arg0Ty, | |||
1071 | bool IsSuper, | |||
1072 | const CallArgList &CallArgs, | |||
1073 | const ObjCMethodDecl *OMD, | |||
1074 | const ObjCInterfaceDecl *ClassReceiver, | |||
1075 | const ObjCCommonTypesHelper &ObjCTypes); | |||
1076 | ||||
1077 | /// EmitImageInfo - Emit the image info marker used to encode some module | |||
1078 | /// level information. | |||
1079 | void EmitImageInfo(); | |||
1080 | ||||
1081 | public: | |||
1082 | CGObjCCommonMac(CodeGen::CodeGenModule &cgm) : | |||
1083 | CGObjCRuntime(cgm), VMContext(cgm.getLLVMContext()) { } | |||
1084 | ||||
1085 | bool isNonFragileABI() const { | |||
1086 | return ObjCABI == 2; | |||
1087 | } | |||
1088 | ||||
1089 | ConstantAddress GenerateConstantString(const StringLiteral *SL) override; | |||
1090 | ConstantAddress GenerateConstantNSString(const StringLiteral *SL); | |||
1091 | ||||
1092 | llvm::Function *GenerateMethod(const ObjCMethodDecl *OMD, | |||
1093 | const ObjCContainerDecl *CD=nullptr) override; | |||
1094 | ||||
1095 | void GenerateProtocol(const ObjCProtocolDecl *PD) override; | |||
1096 | ||||
1097 | /// GetOrEmitProtocol - Get the protocol object for the given | |||
1098 | /// declaration, emitting it if necessary. The return value has type | |||
1099 | /// ProtocolPtrTy. | |||
1100 | virtual llvm::Constant *GetOrEmitProtocol(const ObjCProtocolDecl *PD)=0; | |||
1101 | ||||
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; | |||
1107 | ||||
1108 | virtual llvm::Constant *getNSConstantStringClassRef() = 0; | |||
1109 | ||||
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; | |||
1116 | ||||
1117 | llvm::Constant *BuildByrefLayout(CodeGen::CodeGenModule &CGM, | |||
1118 | QualType T) override; | |||
1119 | ||||
1120 | private: | |||
1121 | void fillRunSkipBlockVars(CodeGenModule &CGM, const CGBlockInfo &blockInfo); | |||
1122 | }; | |||
1123 | ||||
1124 | namespace { | |||
1125 | ||||
1126 | enum class MethodListType { | |||
1127 | CategoryInstanceMethods, | |||
1128 | CategoryClassMethods, | |||
1129 | InstanceMethods, | |||
1130 | ClassMethods, | |||
1131 | ProtocolInstanceMethods, | |||
1132 | ProtocolClassMethods, | |||
1133 | OptionalProtocolInstanceMethods, | |||
1134 | OptionalProtocolClassMethods, | |||
1135 | }; | |||
1136 | ||||
1137 | /// A convenience class for splitting the methods of a protocol into | |||
1138 | /// the four interesting groups. | |||
1139 | class ProtocolMethodLists { | |||
1140 | public: | |||
1141 | enum Kind { | |||
1142 | RequiredInstanceMethods, | |||
1143 | RequiredClassMethods, | |||
1144 | OptionalInstanceMethods, | |||
1145 | OptionalClassMethods | |||
1146 | }; | |||
1147 | enum { | |||
1148 | NumProtocolMethodLists = 4 | |||
1149 | }; | |||
1150 | ||||
1151 | static MethodListType getMethodListKind(Kind kind) { | |||
1152 | switch (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; | |||
1161 | } | |||
1162 | llvm_unreachable("bad kind")::llvm::llvm_unreachable_internal("bad kind", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 1162); | |||
1163 | } | |||
1164 | ||||
1165 | SmallVector<const ObjCMethodDecl *, 4> Methods[NumProtocolMethodLists]; | |||
1166 | ||||
1167 | static ProtocolMethodLists get(const ObjCProtocolDecl *PD) { | |||
1168 | ProtocolMethodLists result; | |||
1169 | ||||
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); | |||
1174 | } | |||
1175 | ||||
1176 | return result; | |||
1177 | } | |||
1178 | ||||
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: | |||
1183 | // instance methods | |||
1184 | // class methods | |||
1185 | // optional instance methods | |||
1186 | // optional class methods | |||
1187 | SmallVector<llvm::Constant*, 8> result; | |||
1188 | ||||
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)); | |||
1193 | } | |||
1194 | } | |||
1195 | ||||
1196 | return result; | |||
1197 | } | |||
1198 | ||||
1199 | template <class Self> | |||
1200 | llvm::Constant *emitMethodList(Self *self, const ObjCProtocolDecl *PD, | |||
1201 | Kind kind) const { | |||
1202 | return self->emitMethodList(PD->getObjCRuntimeNameAsString(), | |||
1203 | getMethodListKind(kind), Methods[kind]); | |||
1204 | } | |||
1205 | }; | |||
1206 | ||||
1207 | } // end anonymous namespace | |||
1208 | ||||
1209 | class CGObjCMac : public CGObjCCommonMac { | |||
1210 | private: | |||
1211 | friend ProtocolMethodLists; | |||
1212 | ||||
1213 | ObjCTypesHelper ObjCTypes; | |||
1214 | ||||
1215 | /// EmitModuleInfo - Another marker encoding module level | |||
1216 | /// information. | |||
1217 | void EmitModuleInfo(); | |||
1218 | ||||
1219 | /// EmitModuleSymols - Emit module symbols, the list of defined | |||
1220 | /// classes and categories. The result has type SymtabPtrTy. | |||
1221 | llvm::Constant *EmitModuleSymbols(); | |||
1222 | ||||
1223 | /// FinishModule - Write out global data structures at the end of | |||
1224 | /// processing a translation unit. | |||
1225 | void FinishModule(); | |||
1226 | ||||
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, | |||
1233 | bool isMetaclass); | |||
1234 | ||||
1235 | /// EmitClassRef - Return a Value*, of type ObjCTypes.ClassPtrTy, | |||
1236 | /// for the given class. | |||
1237 | llvm::Value *EmitClassRef(CodeGenFunction &CGF, | |||
1238 | const ObjCInterfaceDecl *ID); | |||
1239 | ||||
1240 | llvm::Value *EmitClassRefFromId(CodeGenFunction &CGF, | |||
1241 | IdentifierInfo *II); | |||
1242 | ||||
1243 | llvm::Value *EmitNSAutoreleasePoolClassRef(CodeGenFunction &CGF) override; | |||
1244 | ||||
1245 | /// EmitSuperClassRef - Emits reference to class's main metadata class. | |||
1246 | llvm::Value *EmitSuperClassRef(const ObjCInterfaceDecl *ID); | |||
1247 | ||||
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 | |||
1252 | /// IvarListPtrTy. | |||
1253 | llvm::Constant *EmitIvarList(const ObjCImplementationDecl *ID, | |||
1254 | bool ForClass); | |||
1255 | ||||
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); | |||
1260 | ||||
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); | |||
1266 | ||||
1267 | void emitMethodConstant(ConstantArrayBuilder &builder, | |||
1268 | const ObjCMethodDecl *MD); | |||
1269 | ||||
1270 | void emitMethodDescriptionConstant(ConstantArrayBuilder &builder, | |||
1271 | const ObjCMethodDecl *MD); | |||
1272 | ||||
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); | |||
1277 | ||||
1278 | /// GetOrEmitProtocol - Get the protocol object for the given | |||
1279 | /// declaration, emitting it if necessary. The return value has type | |||
1280 | /// ProtocolPtrTy. | |||
1281 | llvm::Constant *GetOrEmitProtocol(const ObjCProtocolDecl *PD) override; | |||
1282 | ||||
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; | |||
1288 | ||||
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. | |||
1293 | llvm::Constant * | |||
1294 | EmitProtocolExtension(const ObjCProtocolDecl *PD, | |||
1295 | const ProtocolMethodLists &methodLists); | |||
1296 | ||||
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); | |||
1302 | ||||
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); | |||
1307 | ||||
1308 | public: | |||
1309 | CGObjCMac(CodeGen::CodeGenModule &cgm); | |||
1310 | ||||
1311 | llvm::Constant *getNSConstantStringClassRef() override; | |||
1312 | ||||
1313 | llvm::Function *ModuleInitFunction() override; | |||
1314 | ||||
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; | |||
1322 | ||||
1323 | CodeGen::RValue | |||
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; | |||
1330 | ||||
1331 | llvm::Value *GetClass(CodeGenFunction &CGF, | |||
1332 | const ObjCInterfaceDecl *ID) override; | |||
1333 | ||||
1334 | llvm::Value *GetSelector(CodeGenFunction &CGF, Selector Sel) override; | |||
1335 | Address GetAddrOfSelector(CodeGenFunction &CGF, Selector Sel) override; | |||
1336 | ||||
1337 | /// The NeXT/Apple runtimes do not support typed selectors; just emit an | |||
1338 | /// untyped one. | |||
1339 | llvm::Value *GetSelector(CodeGenFunction &CGF, | |||
1340 | const ObjCMethodDecl *Method) override; | |||
1341 | ||||
1342 | llvm::Constant *GetEHType(QualType T) override; | |||
1343 | ||||
1344 | void GenerateCategory(const ObjCCategoryImplDecl *CMD) override; | |||
1345 | ||||
1346 | void GenerateClass(const ObjCImplementationDecl *ClassDecl) override; | |||
1347 | ||||
1348 | void RegisterAlias(const ObjCCompatibleAliasDecl *OAD) override {} | |||
1349 | ||||
1350 | llvm::Value *GenerateProtocolRef(CodeGenFunction &CGF, | |||
1351 | const ObjCProtocolDecl *PD) override; | |||
1352 | ||||
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; | |||
1362 | ||||
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; | |||
1385 | ||||
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; | |||
1392 | }; | |||
1393 | ||||
1394 | class CGObjCNonFragileABIMac : public CGObjCCommonMac { | |||
1395 | private: | |||
1396 | friend ProtocolMethodLists; | |||
1397 | ObjCNonFragileABITypesHelper ObjCTypes; | |||
1398 | llvm::GlobalVariable* ObjCEmptyCacheVar; | |||
1399 | llvm::Constant* ObjCEmptyVtableVar; | |||
1400 | ||||
1401 | /// SuperClassReferences - uniqued super class references. | |||
1402 | llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> SuperClassReferences; | |||
1403 | ||||
1404 | /// MetaClassReferences - uniqued meta class references. | |||
1405 | llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> MetaClassReferences; | |||
1406 | ||||
1407 | /// EHTypeReferences - uniqued class ehtype references. | |||
1408 | llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> EHTypeReferences; | |||
1409 | ||||
1410 | /// VTableDispatchMethods - List of methods for which we generate | |||
1411 | /// vtable-based message dispatch. | |||
1412 | llvm::DenseSet<Selector> VTableDispatchMethods; | |||
1413 | ||||
1414 | /// DefinedMetaClasses - List of defined meta-classes. | |||
1415 | std::vector<llvm::GlobalValue*> DefinedMetaClasses; | |||
1416 | ||||
1417 | /// isVTableDispatchedSelector - Returns true if SEL is a | |||
1418 | /// vtable-based selector. | |||
1419 | bool isVTableDispatchedSelector(Selector Sel); | |||
1420 | ||||
1421 | /// FinishNonFragileABIModule - Write out global data structures at the end of | |||
1422 | /// processing a translation unit. | |||
1423 | void FinishNonFragileABIModule(); | |||
1424 | ||||
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); | |||
1429 | ||||
1430 | llvm::GlobalVariable * BuildClassRoTInitializer(unsigned flags, | |||
1431 | unsigned InstanceStart, | |||
1432 | unsigned InstanceSize, | |||
1433 | const ObjCImplementationDecl *ID); | |||
1434 | llvm::GlobalVariable *BuildClassObject(const ObjCInterfaceDecl *CI, | |||
1435 | bool isMetaclass, | |||
1436 | llvm::Constant *IsAGV, | |||
1437 | llvm::Constant *SuperClassGV, | |||
1438 | llvm::Constant *ClassRoGV, | |||
1439 | bool HiddenVisibility); | |||
1440 | ||||
1441 | void emitMethodConstant(ConstantArrayBuilder &builder, | |||
1442 | const ObjCMethodDecl *MD, | |||
1443 | bool forProtocol); | |||
1444 | ||||
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); | |||
1449 | ||||
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); | |||
1456 | ||||
1457 | llvm::Constant *EmitIvarOffsetVar(const ObjCInterfaceDecl *ID, | |||
1458 | const ObjCIvarDecl *Ivar, | |||
1459 | unsigned long int offset); | |||
1460 | ||||
1461 | /// GetOrEmitProtocol - Get the protocol object for the given | |||
1462 | /// declaration, emitting it if necessary. The return value has type | |||
1463 | /// ProtocolPtrTy. | |||
1464 | llvm::Constant *GetOrEmitProtocol(const ObjCProtocolDecl *PD) override; | |||
1465 | ||||
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; | |||
1471 | ||||
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); | |||
1477 | ||||
1478 | CodeGen::RValue EmitVTableMessageSend(CodeGen::CodeGenFunction &CGF, | |||
1479 | ReturnValueSlot Return, | |||
1480 | QualType ResultType, | |||
1481 | Selector Sel, | |||
1482 | llvm::Value *Receiver, | |||
1483 | QualType Arg0Ty, | |||
1484 | bool IsSuper, | |||
1485 | const CallArgList &CallArgs, | |||
1486 | const ObjCMethodDecl *Method); | |||
1487 | ||||
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, | |||
1494 | bool isMetaclass, | |||
1495 | ForDefinition_t isForDefinition); | |||
1496 | ||||
1497 | llvm::Constant *GetClassGlobalForClassRef(const ObjCInterfaceDecl *ID); | |||
1498 | ||||
1499 | llvm::Value *EmitLoadOfClassRef(CodeGenFunction &CGF, | |||
1500 | const ObjCInterfaceDecl *ID, | |||
1501 | llvm::GlobalVariable *Entry); | |||
1502 | ||||
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); | |||
1507 | ||||
1508 | llvm::Value *EmitClassRefFromId(CodeGenFunction &CGF, | |||
1509 | IdentifierInfo *II, | |||
1510 | const ObjCInterfaceDecl *ID); | |||
1511 | ||||
1512 | llvm::Value *EmitNSAutoreleasePoolClassRef(CodeGenFunction &CGF) override; | |||
1513 | ||||
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); | |||
1518 | ||||
1519 | /// EmitMetaClassRef - Return a Value * of the address of _class_t | |||
1520 | /// meta-data | |||
1521 | llvm::Value *EmitMetaClassRef(CodeGenFunction &CGF, | |||
1522 | const ObjCInterfaceDecl *ID, bool Weak); | |||
1523 | ||||
1524 | /// ObjCIvarOffsetVariable - Returns the ivar offset variable for | |||
1525 | /// the given ivar. | |||
1526 | /// | |||
1527 | llvm::GlobalVariable * ObjCIvarOffsetVariable( | |||
1528 | const ObjCInterfaceDecl *ID, | |||
1529 | const ObjCIvarDecl *Ivar); | |||
1530 | ||||
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); | |||
1535 | ||||
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); | |||
1540 | ||||
1541 | StringRef getMetaclassSymbolPrefix() const { return "OBJC_METACLASS_$_"; } | |||
1542 | ||||
1543 | StringRef getClassSymbolPrefix() const { return "OBJC_CLASS_$_"; } | |||
1544 | ||||
1545 | void GetClassSizeInfo(const ObjCImplementationDecl *OID, | |||
1546 | uint32_t &InstanceStart, | |||
1547 | uint32_t &InstanceSize); | |||
1548 | ||||
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); | |||
1553 | } | |||
1554 | ||||
1555 | Selector GetUnarySelector(const char* name) const { | |||
1556 | IdentifierInfo* II = &CGM.getContext().Idents.get(name); | |||
1557 | return CGM.getContext().Selectors.getSelector(1, &II); | |||
1558 | } | |||
1559 | ||||
1560 | /// ImplementationIsNonLazy - Check whether the given category or | |||
1561 | /// class implementation is "non-lazy". | |||
1562 | bool ImplementationIsNonLazy(const ObjCImplDecl *OD) const; | |||
1563 | ||||
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. | |||
1571 | // | |||
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); | |||
1581 | return false; | |||
1582 | } | |||
1583 | ||||
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"; | |||
1591 | } | |||
1592 | ||||
1593 | public: | |||
1594 | CGObjCNonFragileABIMac(CodeGen::CodeGenModule &cgm); | |||
1595 | ||||
1596 | llvm::Constant *getNSConstantStringClassRef() override; | |||
1597 | ||||
1598 | llvm::Function *ModuleInitFunction() override; | |||
1599 | ||||
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; | |||
1607 | ||||
1608 | CodeGen::RValue | |||
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; | |||
1615 | ||||
1616 | llvm::Value *GetClass(CodeGenFunction &CGF, | |||
1617 | const ObjCInterfaceDecl *ID) override; | |||
1618 | ||||
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); } | |||
1623 | ||||
1624 | /// The NeXT/Apple runtimes do not support typed selectors; just emit an | |||
1625 | /// untyped one. | |||
1626 | llvm::Value *GetSelector(CodeGenFunction &CGF, | |||
1627 | const ObjCMethodDecl *Method) override | |||
1628 | { return EmitSelector(CGF, Method->getSelector()); } | |||
1629 | ||||
1630 | void GenerateCategory(const ObjCCategoryImplDecl *CMD) override; | |||
1631 | ||||
1632 | void GenerateClass(const ObjCImplementationDecl *ClassDecl) override; | |||
1633 | ||||
1634 | void RegisterAlias(const ObjCCompatibleAliasDecl *OAD) override {} | |||
1635 | ||||
1636 | llvm::Value *GenerateProtocolRef(CodeGenFunction &CGF, | |||
1637 | const ObjCProtocolDecl *PD) override; | |||
1638 | ||||
1639 | llvm::Constant *GetEHType(QualType T) override; | |||
1640 | ||||
1641 | llvm::FunctionCallee GetPropertyGetFunction() override { | |||
1642 | return ObjCTypes.getGetPropertyFn(); | |||
1643 | } | |||
1644 | llvm::FunctionCallee GetPropertySetFunction() override { | |||
1645 | return ObjCTypes.getSetPropertyFn(); | |||
1646 | } | |||
1647 | ||||
1648 | llvm::FunctionCallee GetOptimizedPropertySetFunction(bool atomic, | |||
1649 | bool copy) override { | |||
1650 | return ObjCTypes.getOptimizedSetPropertyFn(atomic, copy); | |||
1651 | } | |||
1652 | ||||
1653 | llvm::FunctionCallee GetSetStructFunction() override { | |||
1654 | return ObjCTypes.getCopyStructFn(); | |||
1655 | } | |||
1656 | ||||
1657 | llvm::FunctionCallee GetGetStructFunction() override { | |||
1658 | return ObjCTypes.getCopyStructFn(); | |||
1659 | } | |||
1660 | ||||
1661 | llvm::FunctionCallee GetCppAtomicObjectSetFunction() override { | |||
1662 | return ObjCTypes.getCppAtomicObjectFunction(); | |||
1663 | } | |||
1664 | ||||
1665 | llvm::FunctionCallee GetCppAtomicObjectGetFunction() override { | |||
1666 | return ObjCTypes.getCppAtomicObjectFunction(); | |||
1667 | } | |||
1668 | ||||
1669 | llvm::FunctionCallee EnumerationMutationFunction() override { | |||
1670 | return ObjCTypes.getEnumerationMutationFn(); | |||
1671 | } | |||
1672 | ||||
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; | |||
1700 | }; | |||
1701 | ||||
1702 | /// A helper class for performing the null-initialization of a return | |||
1703 | /// value. | |||
1704 | struct NullReturnState { | |||
1705 | llvm::BasicBlock *NullBB; | |||
1706 | NullReturnState() : NullBB(nullptr) {} | |||
1707 | ||||
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"); | |||
1713 | ||||
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); | |||
1720 | ||||
1721 | // Otherwise, start performing the call. | |||
1722 | CGF.EmitBlock(callBB); | |||
1723 | } | |||
1724 | ||||
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, | |||
1729 | RValue result, | |||
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; | |||
1735 | ||||
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; | |||
1739 | ||||
1740 | // Finish the call path. | |||
1741 | llvm::BasicBlock *callBB = CGF.Builder.GetInsertBlock(); | |||
1742 | if (callBB) { | |||
1743 | contBB = CGF.createBasicBlock("msgSend.cont"); | |||
1744 | CGF.Builder.CreateBr(contBB); | |||
1745 | } | |||
1746 | ||||
1747 | // Okay, start emitting the null-receiver block. | |||
1748 | CGF.EmitBlock(NullBB); | |||
1749 | ||||
1750 | // Release any consumed arguments we've got. | |||
1751 | if (Method) { | |||
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() &&((RV.isScalar() && "NullReturnState::complete - arg not on object" ) ? static_cast<void> (0) : __assert_fail ("RV.isScalar() && \"NullReturnState::complete - arg not on object\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 1759, __PRETTY_FUNCTION__)) | |||
1759 | "NullReturnState::complete - arg not on object")((RV.isScalar() && "NullReturnState::complete - arg not on object" ) ? static_cast<void> (0) : __assert_fail ("RV.isScalar() && \"NullReturnState::complete - arg not on object\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 1759, __PRETTY_FUNCTION__)); | |||
1760 | CGF.EmitARCRelease(RV.getScalarVal(), ARCImpreciseLifetime); | |||
1761 | } | |||
1762 | } | |||
1763 | } | |||
1764 | ||||
1765 | // The phi code below assumes that we haven't needed any control flow yet. | |||
1766 | assert(CGF.Builder.GetInsertBlock() == NullBB)((CGF.Builder.GetInsertBlock() == NullBB) ? static_cast<void > (0) : __assert_fail ("CGF.Builder.GetInsertBlock() == NullBB" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 1766, __PRETTY_FUNCTION__)); | |||
1767 | ||||
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); | |||
1772 | return result; | |||
1773 | } | |||
1774 | ||||
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); | |||
1779 | ||||
1780 | // If no join is necessary, just flow out. | |||
1781 | if (!contBB) return RValue::get(null); | |||
1782 | ||||
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); | |||
1789 | } | |||
1790 | ||||
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?")((result.isAggregate() && "null init of non-aggregate result?" ) ? static_cast<void> (0) : __assert_fail ("result.isAggregate() && \"null init of non-aggregate result?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 1796, __PRETTY_FUNCTION__)); | |||
1797 | if (!returnSlot.isUnused()) | |||
1798 | CGF.EmitNullInitialization(result.getAggregateAddress(), resultType); | |||
1799 | if (contBB) CGF.EmitBlock(contBB); | |||
1800 | return result; | |||
1801 | } | |||
1802 | ||||
1803 | // Complex types. | |||
1804 | CGF.EmitBlock(contBB); | |||
1805 | CodeGenFunction::ComplexPairTy callResult = result.getComplexVal(); | |||
1806 | ||||
1807 | // Find the scalar type and its zero value. | |||
1808 | llvm::Type *scalarTy = callResult.first->getType(); | |||
1809 | llvm::Constant *scalarZero = llvm::Constant::getNullValue(scalarTy); | |||
1810 | ||||
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); | |||
1819 | } | |||
1820 | }; | |||
1821 | ||||
1822 | } // end anonymous namespace | |||
1823 | ||||
1824 | /* *** Helper Functions *** */ | |||
1825 | ||||
1826 | /// getConstantGEP() - Help routine to construct simple GEPs. | |||
1827 | static llvm::Constant *getConstantGEP(llvm::LLVMContext &VMContext, | |||
1828 | llvm::GlobalVariable *C, unsigned idx0, | |||
1829 | unsigned idx1) { | |||
1830 | llvm::Value *Idxs[] = { | |||
1831 | llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), idx0), | |||
1832 | llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), idx1) | |||
1833 | }; | |||
1834 | return llvm::ConstantExpr::getGetElementPtr(C->getValueType(), C, Idxs); | |||
1835 | } | |||
1836 | ||||
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>()) | |||
1842 | return true; | |||
1843 | if (const ObjCInterfaceDecl *Super = OID->getSuperClass()) | |||
1844 | return hasObjCExceptionAttribute(Context, Super); | |||
1845 | return false; | |||
1846 | } | |||
1847 | ||||
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; | |||
1854 | } | |||
1855 | ||||
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); | |||
1867 | return GV; | |||
1868 | } | |||
1869 | ||||
1870 | /* *** CGObjCMac Public Interface *** */ | |||
1871 | ||||
1872 | CGObjCMac::CGObjCMac(CodeGen::CodeGenModule &cgm) : CGObjCCommonMac(cgm), | |||
1873 | ObjCTypes(cgm) { | |||
1874 | ObjCABI = 1; | |||
1875 | EmitImageInfo(); | |||
1876 | } | |||
1877 | ||||
1878 | /// GetClass - Return a reference to the class for the given interface | |||
1879 | /// decl. | |||
1880 | llvm::Value *CGObjCMac::GetClass(CodeGenFunction &CGF, | |||
1881 | const ObjCInterfaceDecl *ID) { | |||
1882 | return EmitClassRef(CGF, ID); | |||
1883 | } | |||
1884 | ||||
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); | |||
1888 | } | |||
1889 | Address CGObjCMac::GetAddrOfSelector(CodeGenFunction &CGF, Selector Sel) { | |||
1890 | return EmitSelectorAddr(CGF, Sel); | |||
1891 | } | |||
1892 | llvm::Value *CGObjCMac::GetSelector(CodeGenFunction &CGF, const ObjCMethodDecl | |||
1893 | *Method) { | |||
1894 | return EmitSelector(CGF, Method->getSelector()); | |||
1895 | } | |||
1896 | ||||
1897 | llvm::Constant *CGObjCMac::GetEHType(QualType T) { | |||
1898 | if (T->isObjCIdType() || | |||
1899 | T->isObjCQualifiedIdType()) { | |||
1900 | return CGM.GetAddrOfRTTIDescriptor( | |||
1901 | CGM.getContext().getObjCIdRedefinitionType(), /*ForEH=*/true); | |||
1902 | } | |||
1903 | if (T->isObjCClassType() || | |||
1904 | T->isObjCQualifiedClassType()) { | |||
1905 | return CGM.GetAddrOfRTTIDescriptor( | |||
1906 | CGM.getContext().getObjCClassRedefinitionType(), /*ForEH=*/true); | |||
1907 | } | |||
1908 | if (T->isObjCObjectPointerType()) | |||
1909 | return CGM.GetAddrOfRTTIDescriptor(T, /*ForEH=*/true); | |||
1910 | ||||
1911 | llvm_unreachable("asking for catch type for ObjC type in fragile runtime")::llvm::llvm_unreachable_internal("asking for catch type for ObjC type in fragile runtime" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 1911); | |||
1912 | } | |||
1913 | ||||
1914 | /// Generate a constant CFString object. | |||
1915 | /* | |||
1916 | struct __builtin_CFString { | |||
1917 | const int *isa; // point to __CFConstantStringClassReference | |||
1918 | int flags; | |||
1919 | const char *str; | |||
1920 | long length; | |||
1921 | }; | |||
1922 | */ | |||
1923 | ||||
1924 | /// or Generate a constant NSString object. | |||
1925 | /* | |||
1926 | struct __builtin_NSString { | |||
1927 | const int *isa; // point to __NSConstantStringClassReference | |||
1928 | const char *str; | |||
1929 | unsigned int length; | |||
1930 | }; | |||
1931 | */ | |||
1932 | ||||
1933 | ConstantAddress | |||
1934 | CGObjCCommonMac::GenerateConstantString(const StringLiteral *SL) { | |||
1935 | return (!CGM.getLangOpts().NoConstantCFStrings | |||
1936 | ? CGM.GetAddrOfConstantCFString(SL) | |||
1937 | : GenerateConstantNSString(SL)); | |||
1938 | } | |||
1939 | ||||
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; | |||
1946 | } | |||
1947 | ||||
1948 | llvm::Constant *CGObjCMac::getNSConstantStringClassRef() { | |||
1949 | if (llvm::Value *V = ConstantStringClassRef) | |||
1950 | return cast<llvm::Constant>(V); | |||
1951 | ||||
1952 | auto &StringClass = CGM.getLangOpts().ObjCConstantStringClass; | |||
1953 | std::string str = | |||
1954 | StringClass.empty() ? "_NSConstantStringClassReference" | |||
1955 | : "_" + StringClass + "ClassReference"; | |||
1956 | ||||
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; | |||
1961 | return V; | |||
1962 | } | |||
1963 | ||||
1964 | llvm::Constant *CGObjCNonFragileABIMac::getNSConstantStringClassRef() { | |||
1965 | if (llvm::Value *V = ConstantStringClassRef) | |||
1966 | return cast<llvm::Constant>(V); | |||
1967 | ||||
1968 | auto &StringClass = CGM.getLangOpts().ObjCConstantStringClass; | |||
1969 | std::string str = | |||
1970 | StringClass.empty() ? "OBJC_CLASS_$_NSConstantString" | |||
1971 | : "OBJC_CLASS_$_" + StringClass; | |||
1972 | llvm::Constant *GV = GetClassGlobal(str, NotForDefinition); | |||
1973 | ||||
1974 | // Make sure the result is of the correct type. | |||
1975 | auto V = llvm::ConstantExpr::getBitCast(GV, CGM.IntTy->getPointerTo()); | |||
1976 | ||||
1977 | ConstantStringClassRef = V; | |||
1978 | return V; | |||
1979 | } | |||
1980 | ||||
1981 | ConstantAddress | |||
1982 | CGObjCCommonMac::GenerateConstantNSString(const StringLiteral *Literal) { | |||
1983 | unsigned StringLength = 0; | |||
1984 | llvm::StringMapEntry<llvm::GlobalVariable *> &Entry = | |||
1985 | GetConstantStringEntry(NSConstantStringMap, Literal, StringLength); | |||
1986 | ||||
1987 | if (auto *C = Entry.second) | |||
1988 | return ConstantAddress(C, CharUnits::fromQuantity(C->getAlignment())); | |||
1989 | ||||
1990 | // If we don't already have it, get _NSConstantStringClassReference. | |||
1991 | llvm::Constant *Class = getNSConstantStringClassRef(); | |||
1992 | ||||
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(), | |||
1998 | CGM.Int8PtrTy, | |||
1999 | CGM.IntTy | |||
2000 | }, "struct.__builtin_NSString"); | |||
2001 | } | |||
2002 | ||||
2003 | ConstantInitBuilder Builder(CGM); | |||
2004 | auto Fields = Builder.beginStruct(NSConstantStringType); | |||
2005 | ||||
2006 | // Class pointer. | |||
2007 | Fields.add(Class); | |||
2008 | ||||
2009 | // String pointer. | |||
2010 | llvm::Constant *C = | |||
2011 | llvm::ConstantDataArray::getString(VMContext, Entry.first()); | |||
2012 | ||||
2013 | llvm::GlobalValue::LinkageTypes Linkage = llvm::GlobalValue::PrivateLinkage; | |||
2014 | bool isConstant = !CGM.getLangOpts().WritableStrings; | |||
2015 | ||||
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); | |||
2023 | ||||
2024 | // String length. | |||
2025 | Fields.addInt(CGM.IntTy, StringLength); | |||
2026 | ||||
2027 | // The struct. | |||
2028 | CharUnits Alignment = CGM.getPointerAlign(); | |||
2029 | GV = Fields.finishAndCreateGlobal("_unnamed_nsstring_", Alignment, | |||
2030 | /*constant*/ true, | |||
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 | |||
2038 | : NSStringSection); | |||
2039 | Entry.second = GV; | |||
2040 | ||||
2041 | return ConstantAddress(GV, Alignment); | |||
2042 | } | |||
2043 | ||||
2044 | enum { | |||
2045 | kCFTaggedObjectID_Integer = (1 << 1) + 1 | |||
2046 | }; | |||
2047 | ||||
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. | |||
2051 | CodeGen::RValue | |||
2052 | CGObjCMac::GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF, | |||
2053 | ReturnValueSlot Return, | |||
2054 | QualType ResultType, | |||
2055 | Selector Sel, | |||
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. | |||
2064 | Address ObjCSuper = | |||
2065 | CGF.CreateTempAlloca(ObjCTypes.SuperTy, CGF.getPointerAlign(), | |||
2066 | "objc_super"); | |||
2067 | llvm::Value *ReceiverAsObject = | |||
2068 | CGF.Builder.CreateBitCast(Receiver, ObjCTypes.ObjectPtrTy); | |||
2069 | CGF.Builder.CreateStore(ReceiverAsObject, | |||
2070 | CGF.Builder.CreateStructGEP(ObjCSuper, 0)); | |||
2071 | ||||
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()); | |||
2085 | } else { | |||
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()); | |||
2091 | Target = Super; | |||
2092 | } | |||
2093 | } else if (isCategoryImpl) | |||
2094 | Target = EmitClassRef(CGF, Class->getSuperClass()); | |||
2095 | else { | |||
2096 | llvm::Value *ClassPtr = EmitSuperClassRef(Class); | |||
2097 | ClassPtr = CGF.Builder.CreateStructGEP(ObjCTypes.ClassTy, ClassPtr, 1); | |||
2098 | Target = CGF.Builder.CreateAlignedLoad(ClassPtr, CGF.getPointerAlign()); | |||
2099 | } | |||
2100 | // FIXME: We shouldn't need to do this cast, rectify the ASTContext and | |||
2101 | // ObjCTypes types. | |||
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); | |||
2110 | } | |||
2111 | ||||
2112 | /// Generate code for a message send expression. | |||
2113 | CodeGen::RValue CGObjCMac::GenerateMessageSend(CodeGen::CodeGenFunction &CGF, | |||
2114 | ReturnValueSlot Return, | |||
2115 | QualType ResultType, | |||
2116 | Selector Sel, | |||
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); | |||
2125 | } | |||
2126 | ||||
2127 | static bool isWeakLinkedClass(const ObjCInterfaceDecl *ID) { | |||
2128 | do { | |||
2129 | if (ID->isWeakImported()) | |||
2130 | return true; | |||
2131 | } while ((ID = ID->getSuperClass())); | |||
2132 | ||||
2133 | return false; | |||
2134 | } | |||
2135 | ||||
2136 | CodeGen::RValue | |||
2137 | CGObjCCommonMac::EmitMessageSend(CodeGen::CodeGenFunction &CGF, | |||
2138 | ReturnValueSlot Return, | |||
2139 | QualType ResultType, | |||
2140 | llvm::Value *Sel, | |||
2141 | llvm::Value *Arg0, | |||
2142 | QualType Arg0Ty, | |||
2143 | bool IsSuper, | |||
2144 | const CallArgList &CallArgs, | |||
2145 | const ObjCMethodDecl *Method, | |||
2146 | const ObjCInterfaceDecl *ClassReceiver, | |||
2147 | const ObjCCommonTypesHelper &ObjCTypes) { | |||
2148 | CallArgList ActualArgs; | |||
2149 | if (!IsSuper) | |||
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); | |||
2154 | ||||
2155 | // If we're calling a method, use the formal signature. | |||
2156 | MessageSendInfo MSI = getMessageSendInfo(Method, ResultType, ActualArgs); | |||
2157 | ||||
2158 | if (Method) | |||
2159 | assert(CGM.getContext().getCanonicalType(Method->getReturnType()) ==((CGM.getContext().getCanonicalType(Method->getReturnType( )) == CGM.getContext().getCanonicalType(ResultType) && "Result type mismatch!") ? static_cast<void> (0) : __assert_fail ("CGM.getContext().getCanonicalType(Method->getReturnType()) == CGM.getContext().getCanonicalType(ResultType) && \"Result type mismatch!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 2161, __PRETTY_FUNCTION__)) | |||
2160 | CGM.getContext().getCanonicalType(ResultType) &&((CGM.getContext().getCanonicalType(Method->getReturnType( )) == CGM.getContext().getCanonicalType(ResultType) && "Result type mismatch!") ? static_cast<void> (0) : __assert_fail ("CGM.getContext().getCanonicalType(Method->getReturnType()) == CGM.getContext().getCanonicalType(ResultType) && \"Result type mismatch!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 2161, __PRETTY_FUNCTION__)) | |||
2161 | "Result type mismatch!")((CGM.getContext().getCanonicalType(Method->getReturnType( )) == CGM.getContext().getCanonicalType(ResultType) && "Result type mismatch!") ? static_cast<void> (0) : __assert_fail ("CGM.getContext().getCanonicalType(Method->getReturnType()) == CGM.getContext().getCanonicalType(ResultType) && \"Result type mismatch!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 2161, __PRETTY_FUNCTION__)); | |||
2162 | ||||
2163 | bool ReceiverCanBeNull = true; | |||
2164 | ||||
2165 | // Super dispatch assumes that self is non-null; even the messenger | |||
2166 | // doesn't have a null check internally. | |||
2167 | if (IsSuper) { | |||
2168 | ReceiverCanBeNull = false; | |||
2169 | ||||
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); | |||
2174 | ||||
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; | |||
2185 | } | |||
2186 | } | |||
2187 | } | |||
2188 | } | |||
2189 | ||||
2190 | bool RequiresNullCheck = false; | |||
2191 | ||||
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); | |||
2203 | } else { | |||
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); | |||
2210 | } | |||
2211 | ||||
2212 | // Cast function to proper signature | |||
2213 | llvm::Constant *BitcastFn = cast<llvm::Constant>( | |||
2214 | CGF.Builder.CreateBitCast(Fn.getCallee(), MSI.MessengerType)); | |||
2215 | ||||
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; | |||
2220 | ||||
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; | |||
2226 | break; | |||
2227 | } | |||
2228 | } | |||
2229 | } | |||
2230 | ||||
2231 | NullReturnState nullReturn; | |||
2232 | if (RequiresNullCheck) { | |||
2233 | nullReturn.init(CGF, Arg0); | |||
2234 | } | |||
2235 | ||||
2236 | llvm::CallBase *CallSite; | |||
2237 | CGCallee Callee = CGCallee::forDirect(BitcastFn); | |||
2238 | RValue rvalue = CGF.EmitCall(MSI.CallInfo, Callee, Return, ActualArgs, | |||
2239 | &CallSite); | |||
2240 | ||||
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(); | |||
2245 | } | |||
2246 | ||||
2247 | return nullReturn.complete(CGF, Return, rvalue, ResultType, CallArgs, | |||
2248 | RequiresNullCheck ? Method : nullptr); | |||
2249 | } | |||
2250 | ||||
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; | |||
2258 | ||||
2259 | if (FQT.isObjCGCWeak()) | |||
2260 | return Qualifiers::Weak; | |||
2261 | ||||
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?")::llvm::llvm_unreachable_internal("autoreleasing ivar?", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 2269); | |||
2270 | case Qualifiers::OCL_None: llvm_unreachable("known nonzero")::llvm::llvm_unreachable_internal("known nonzero", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 2270); | |||
2271 | } | |||
2272 | llvm_unreachable("bad objc ownership")::llvm::llvm_unreachable_internal("bad objc ownership", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 2272); | |||
2273 | } | |||
2274 | ||||
2275 | // Treat unqualified retainable pointers as strong. | |||
2276 | if (FQT->isObjCObjectPointerType() || FQT->isBlockPointerType()) | |||
2277 | return Qualifiers::Strong; | |||
2278 | ||||
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); | |||
2283 | } | |||
2284 | ||||
2285 | return Qualifiers::GCNone; | |||
2286 | } | |||
2287 | ||||
2288 | namespace { | |||
2289 | struct IvarInfo { | |||
2290 | CharUnits Offset; | |||
2291 | uint64_t SizeInWords; | |||
2292 | IvarInfo(CharUnits offset, uint64_t sizeInWords) | |||
2293 | : Offset(offset), SizeInWords(sizeInWords) {} | |||
2294 | ||||
2295 | // Allow sorting based on byte pos. | |||
2296 | bool operator<(const IvarInfo &other) const { | |||
2297 | return Offset < other.Offset; | |||
2298 | } | |||
2299 | }; | |||
2300 | ||||
2301 | /// A helper class for building GC layout strings. | |||
2302 | class IvarLayoutBuilder { | |||
2303 | CodeGenModule &CGM; | |||
2304 | ||||
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; | |||
2308 | ||||
2309 | /// The end of the layout. Offsets will never exceed this value. | |||
2310 | CharUnits InstanceEnd; | |||
2311 | ||||
2312 | /// Whether we're generating the strong layout or the weak layout. | |||
2313 | bool ForStrongLayout; | |||
2314 | ||||
2315 | /// Whether the offsets in IvarsInfo might be out-of-order. | |||
2316 | bool IsDisordered = false; | |||
2317 | ||||
2318 | llvm::SmallVector<IvarInfo, 8> IvarsInfo; | |||
2319 | ||||
2320 | public: | |||
2321 | IvarLayoutBuilder(CodeGenModule &CGM, CharUnits instanceBegin, | |||
2322 | CharUnits instanceEnd, bool forStrongLayout) | |||
2323 | : CGM(CGM), InstanceBegin(instanceBegin), InstanceEnd(instanceEnd), | |||
2324 | ForStrongLayout(forStrongLayout) { | |||
2325 | } | |||
2326 | ||||
2327 | void visitRecord(const RecordType *RT, CharUnits offset); | |||
2328 | ||||
2329 | template <class Iterator, class GetOffsetFn> | |||
2330 | void visitAggregate(Iterator begin, Iterator end, | |||
2331 | CharUnits aggrOffset, | |||
2332 | const GetOffsetFn &getOffset); | |||
2333 | ||||
2334 | void visitField(const FieldDecl *field, CharUnits offset); | |||
2335 | ||||
2336 | /// Add the layout of a block implementation. | |||
2337 | void visitBlock(const CGBlockInfo &blockInfo); | |||
2338 | ||||
2339 | /// Is there any information for an interesting bitmap? | |||
2340 | bool hasBitmapData() const { return !IvarsInfo.empty(); } | |||
2341 | ||||
2342 | llvm::Constant *buildBitmap(CGObjCCommonMac &CGObjC, | |||
2343 | llvm::SmallVectorImpl<unsigned char> &buffer); | |||
2344 | ||||
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++) | |||
2348 | if (!(s[i] & 0xf0)) | |||
2349 | printf("0x0%x%s", s[i], s[i] != 0 ? ", " : ""); | |||
2350 | else | |||
2351 | printf("0x%x%s", s[i], s[i] != 0 ? ", " : ""); | |||
2352 | printf("\n"); | |||
2353 | } | |||
2354 | }; | |||
2355 | } // end anonymous namespace | |||
2356 | ||||
2357 | llvm::Constant *CGObjCCommonMac::BuildGCBlockLayout(CodeGenModule &CGM, | |||
2358 | const CGBlockInfo &blockInfo) { | |||
2359 | ||||
2360 | llvm::Constant *nullPtr = llvm::Constant::getNullValue(CGM.Int8PtrTy); | |||
2361 | if (CGM.getLangOpts().getGC() == LangOptions::NonGC) | |||
2362 | return nullPtr; | |||
2363 | ||||
2364 | IvarLayoutBuilder builder(CGM, CharUnits::Zero(), blockInfo.BlockSize, | |||
2365 | /*for strong layout*/ true); | |||
2366 | ||||
2367 | builder.visitBlock(blockInfo); | |||
2368 | ||||
2369 | if (!builder.hasBitmapData()) | |||
2370 | return nullPtr; | |||
2371 | ||||
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); | |||
2377 | } | |||
2378 | ||||
2379 | return C; | |||
2380 | } | |||
2381 | ||||
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)); | |||
2386 | ||||
2387 | const BlockDecl *blockDecl = blockInfo.getBlockDecl(); | |||
2388 | ||||
2389 | // Ignore the optional 'this' capture: C++ objects are not assumed | |||
2390 | // to be GC'ed. | |||
2391 | ||||
2392 | CharUnits lastFieldOffset; | |||
2393 | ||||
2394 | // Walk the captured variables. | |||
2395 | for (const auto &CI : blockDecl->captures()) { | |||
2396 | const VarDecl *variable = CI.getVariable(); | |||
2397 | QualType type = variable->getType(); | |||
2398 | ||||
2399 | const CGBlockInfo::Capture &capture = blockInfo.getCapture(variable); | |||
2400 | ||||
2401 | // Ignore constant captures. | |||
2402 | if (capture.isConstant()) continue; | |||
2403 | ||||
2404 | CharUnits fieldOffset = capture.getOffset(); | |||
2405 | ||||
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; | |||
2411 | ||||
2412 | // __block variables are passed by their descriptor address. | |||
2413 | if (CI.isByRef()) { | |||
2414 | IvarsInfo.push_back(IvarInfo(fieldOffset, /*size in words*/ 1)); | |||
2415 | continue; | |||
2416 | } | |||
2417 | ||||
2418 | assert(!type->isArrayType() && "array variable should not be caught")((!type->isArrayType() && "array variable should not be caught" ) ? static_cast<void> (0) : __assert_fail ("!type->isArrayType() && \"array variable should not be caught\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 2418, __PRETTY_FUNCTION__)); | |||
2419 | if (const RecordType *record = type->getAs<RecordType>()) { | |||
2420 | visitRecord(record, fieldOffset); | |||
2421 | continue; | |||
2422 | } | |||
2423 | ||||
2424 | Qualifiers::GC GCAttr = GetGCAttrTypeForType(CGM.getContext(), type); | |||
2425 | ||||
2426 | if (GCAttr == Qualifiers::Strong) { | |||
2427 | assert(CGM.getContext().getTypeSize(type)((CGM.getContext().getTypeSize(type) == CGM.getTarget().getPointerWidth (0)) ? static_cast<void> (0) : __assert_fail ("CGM.getContext().getTypeSize(type) == CGM.getTarget().getPointerWidth(0)" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 2428, __PRETTY_FUNCTION__)) | |||
2428 | == CGM.getTarget().getPointerWidth(0))((CGM.getContext().getTypeSize(type) == CGM.getTarget().getPointerWidth (0)) ? static_cast<void> (0) : __assert_fail ("CGM.getContext().getTypeSize(type) == CGM.getTarget().getPointerWidth(0)" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 2428, __PRETTY_FUNCTION__)); | |||
2429 | IvarsInfo.push_back(IvarInfo(fieldOffset, /*size in words*/ 1)); | |||
2430 | } | |||
2431 | } | |||
2432 | } | |||
2433 | ||||
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, | |||
2438 | bool ByrefLayout) { | |||
2439 | // If it has an ownership qualifier, we're done. | |||
2440 | if (auto lifetime = FQT.getObjCLifetime()) | |||
2441 | return lifetime; | |||
2442 | ||||
2443 | // If it doesn't, and this is ARC, it has no ownership. | |||
2444 | if (CGM.getLangOpts().ObjCAutoRefCount) | |||
2445 | return Qualifiers::OCL_None; | |||
2446 | ||||
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; | |||
2450 | ||||
2451 | return Qualifiers::OCL_None; | |||
2452 | } | |||
2453 | ||||
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. | |||
2459 | if (IsByref) | |||
2460 | RunSkipBlockVars.push_back(RUN_SKIP(BLOCK_LAYOUT_BYREF, FieldOffset, | |||
2461 | FieldSize)); | |||
2462 | else if (LifeTime == Qualifiers::OCL_Strong) | |||
2463 | RunSkipBlockVars.push_back(RUN_SKIP(BLOCK_LAYOUT_STRONG, FieldOffset, | |||
2464 | FieldSize)); | |||
2465 | else if (LifeTime == Qualifiers::OCL_Weak) | |||
2466 | RunSkipBlockVars.push_back(RUN_SKIP(BLOCK_LAYOUT_WEAK, FieldOffset, | |||
2467 | FieldSize)); | |||
2468 | else if (LifeTime == Qualifiers::OCL_ExplicitNone) | |||
2469 | RunSkipBlockVars.push_back(RUN_SKIP(BLOCK_LAYOUT_UNRETAINED, FieldOffset, | |||
2470 | FieldSize)); | |||
2471 | else | |||
2472 | RunSkipBlockVars.push_back(RUN_SKIP(BLOCK_LAYOUT_NON_OBJECT_BYTES, | |||
2473 | FieldOffset, | |||
2474 | FieldSize)); | |||
2475 | } | |||
2476 | ||||
2477 | void CGObjCCommonMac::BuildRCRecordLayout(const llvm::StructLayout *RecLayout, | |||
2478 | const RecordDecl *RD, | |||
2479 | ArrayRef<const FieldDecl*> RecFields, | |||
2480 | CharUnits BytePos, bool &HasUnion, | |||
2481 | bool ByrefLayout) { | |||
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(); | |||
2488 | ||||
2489 | if (RecFields.empty()) | |||
2490 | return; | |||
2491 | unsigned ByteSizeInBits = CGM.getTarget().getCharWidth(); | |||
2492 | ||||
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)); | |||
2500 | ||||
2501 | // Skip over unnamed or bitfields | |||
2502 | if (!Field->getIdentifier() || Field->isBitField()) { | |||
2503 | LastFieldBitfieldOrUnnamed = Field; | |||
2504 | LastBitfieldOrUnnamedOffset = FieldOffset; | |||
2505 | continue; | |||
2506 | } | |||
2507 | ||||
2508 | LastFieldBitfieldOrUnnamed = nullptr; | |||
2509 | QualType FQT = Field->getType(); | |||
2510 | if (FQT->isRecordType() || FQT->isUnionType()) { | |||
2511 | if (FQT->isUnionType()) | |||
2512 | HasUnion = true; | |||
2513 | ||||
2514 | BuildRCBlockVarRecordLayout(FQT->getAs<RecordType>(), | |||
2515 | BytePos + FieldOffset, HasUnion); | |||
2516 | continue; | |||
2517 | } | |||
2518 | ||||
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")((CArray && "only array with known element size is supported" ) ? static_cast<void> (0) : __assert_fail ("CArray && \"only array with known element size is supported\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 2523, __PRETTY_FUNCTION__)); | |||
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(); | |||
2530 | } | |||
2531 | if (FQT->isRecordType() && ElCount) { | |||
2532 | int OldIndex = RunSkipBlockVars.size() - 1; | |||
2533 | const RecordType *RT = FQT->getAs<RecordType>(); | |||
2534 | BuildRCBlockVarRecordLayout(RT, BytePos + FieldOffset, | |||
2535 | HasUnion); | |||
2536 | ||||
2537 | // Replicate layout information for each array element. Note that | |||
2538 | // one element is already done. | |||
2539 | uint64_t ElIx = 1; | |||
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)); | |||
2547 | } | |||
2548 | continue; | |||
2549 | } | |||
2550 | } | |||
2551 | CharUnits FieldSize = CGM.getContext().getTypeSizeInChars(Field->getType()); | |||
2552 | if (IsUnion) { | |||
2553 | CharUnits UnionIvarSize = FieldSize; | |||
2554 | if (UnionIvarSize > MaxUnionSize) { | |||
2555 | MaxUnionSize = UnionIvarSize; | |||
2556 | MaxField = Field; | |||
2557 | MaxFieldOffset = FieldOffset; | |||
2558 | } | |||
2559 | } else { | |||
2560 | UpdateRunSkipBlockVars(false, | |||
2561 | getBlockCaptureLifetime(FQT, ByrefLayout), | |||
2562 | BytePos + FieldOffset, | |||
2563 | FieldSize); | |||
2564 | } | |||
2565 | } | |||
2566 | ||||
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(), | |||
2578 | ByrefLayout), | |||
2579 | BytePos + LastBitfieldOrUnnamedOffset, | |||
2580 | Size); | |||
2581 | } else { | |||
2582 | assert(!LastFieldBitfieldOrUnnamed->getIdentifier() &&"Expected unnamed")((!LastFieldBitfieldOrUnnamed->getIdentifier() &&"Expected unnamed" ) ? static_cast<void> (0) : __assert_fail ("!LastFieldBitfieldOrUnnamed->getIdentifier() &&\"Expected unnamed\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 2582, __PRETTY_FUNCTION__)); | |||
2583 | // Last field was unnamed. Must update skip info. | |||
2584 | CharUnits FieldSize | |||
2585 | = CGM.getContext().getTypeSizeInChars(LastFieldBitfieldOrUnnamed->getType()); | |||
2586 | UpdateRunSkipBlockVars(false, | |||
2587 | getBlockCaptureLifetime(LastFieldBitfieldOrUnnamed->getType(), | |||
2588 | ByrefLayout), | |||
2589 | BytePos + LastBitfieldOrUnnamedOffset, | |||
2590 | FieldSize); | |||
2591 | } | |||
2592 | } | |||
2593 | ||||
2594 | if (MaxField) | |||
2595 | UpdateRunSkipBlockVars(false, | |||
2596 | getBlockCaptureLifetime(MaxField->getType(), ByrefLayout), | |||
2597 | BytePos + MaxFieldOffset, | |||
2598 | MaxUnionSize); | |||
2599 | } | |||
2600 | ||||
2601 | void CGObjCCommonMac::BuildRCBlockVarRecordLayout(const RecordType *RT, | |||
2602 | CharUnits BytePos, | |||
2603 | bool &HasUnion, | |||
2604 | bool ByrefLayout) { | |||
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)); | |||
2610 | ||||
2611 | BuildRCRecordLayout(RecLayout, RD, Fields, BytePos, HasUnion, ByrefLayout); | |||
2612 | } | |||
2613 | ||||
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; | |||
2629 | unsigned char inst; | |||
2630 | enum BLOCK_LAYOUT_OPCODE opcode ; | |||
2631 | switch (size) { | |||
2632 | case 3: | |||
2633 | inst = Layout[0]; | |||
2634 | opcode = (enum BLOCK_LAYOUT_OPCODE) (inst >> 4); | |||
2635 | if (opcode == BLOCK_LAYOUT_STRONG) | |||
2636 | strong_word_count = (inst & 0xF)+1; | |||
2637 | else | |||
2638 | return 0; | |||
2639 | inst = Layout[1]; | |||
2640 | opcode = (enum BLOCK_LAYOUT_OPCODE) (inst >> 4); | |||
2641 | if (opcode == BLOCK_LAYOUT_BYREF) | |||
2642 | byref_word_count = (inst & 0xF)+1; | |||
2643 | else | |||
2644 | return 0; | |||
2645 | inst = Layout[2]; | |||
2646 | opcode = (enum BLOCK_LAYOUT_OPCODE) (inst >> 4); | |||
2647 | if (opcode == BLOCK_LAYOUT_WEAK) | |||
2648 | weak_word_count = (inst & 0xF)+1; | |||
2649 | else | |||
2650 | return 0; | |||
2651 | break; | |||
2652 | ||||
2653 | case 2: | |||
2654 | inst = Layout[0]; | |||
2655 | opcode = (enum BLOCK_LAYOUT_OPCODE) (inst >> 4); | |||
2656 | if (opcode == BLOCK_LAYOUT_STRONG) { | |||
2657 | strong_word_count = (inst & 0xF)+1; | |||
2658 | inst = Layout[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; | |||
2664 | else | |||
2665 | return 0; | |||
2666 | } | |||
2667 | else if (opcode == BLOCK_LAYOUT_BYREF) { | |||
2668 | byref_word_count = (inst & 0xF)+1; | |||
2669 | inst = Layout[1]; | |||
2670 | opcode = (enum BLOCK_LAYOUT_OPCODE) (inst >> 4); | |||
2671 | if (opcode == BLOCK_LAYOUT_WEAK) | |||
2672 | weak_word_count = (inst & 0xF)+1; | |||
2673 | else | |||
2674 | return 0; | |||
2675 | } | |||
2676 | else | |||
2677 | return 0; | |||
2678 | break; | |||
2679 | ||||
2680 | case 1: | |||
2681 | inst = Layout[0]; | |||
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; | |||
2689 | else | |||
2690 | return 0; | |||
2691 | break; | |||
2692 | ||||
2693 | default: | |||
2694 | return 0; | |||
2695 | } | |||
2696 | ||||
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) | |||
2701 | return 0; | |||
2702 | ||||
2703 | unsigned count = | |||
2704 | (strong_word_count != 0) + (byref_word_count != 0) + (weak_word_count != 0); | |||
2705 | ||||
2706 | if (size == count) { | |||
2707 | if (strong_word_count) | |||
2708 | Result = strong_word_count; | |||
2709 | Result <<= 4; | |||
2710 | if (byref_word_count) | |||
2711 | Result += byref_word_count; | |||
2712 | Result <<= 4; | |||
2713 | if (weak_word_count) | |||
2714 | Result += weak_word_count; | |||
2715 | } | |||
2716 | } | |||
2717 | return Result; | |||
2718 | } | |||
2719 | ||||
2720 | llvm::Constant *CGObjCCommonMac::getBitmapBlockLayout(bool ComputeByrefLayout) { | |||
2721 | llvm::Constant *nullPtr = llvm::Constant::getNullValue(CGM.Int8PtrTy); | |||
2722 | if (RunSkipBlockVars.empty()) | |||
2723 | return nullPtr; | |||
2724 | unsigned WordSizeInBits = CGM.getTarget().getPointerWidth(0); | |||
2725 | unsigned ByteSizeInBits = CGM.getTarget().getCharWidth(); | |||
2726 | unsigned WordSizeInBytes = WordSizeInBits/ByteSizeInBits; | |||
2727 | ||||
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; | |||
2732 | ||||
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; | |||
2738 | unsigned j = i+1; | |||
2739 | while (j < size) { | |||
2740 | if (opcode == RunSkipBlockVars[j].opcode) { | |||
2741 | end_byte_pos = RunSkipBlockVars[j++].block_var_bytepos; | |||
2742 | i++; | |||
2743 | } | |||
2744 | else | |||
2745 | break; | |||
2746 | } | |||
2747 | CharUnits size_in_bytes = | |||
2748 | end_byte_pos - start_byte_pos + RunSkipBlockVars[j-1].block_var_size; | |||
2749 | if (j < size) { | |||
2750 | CharUnits gap = | |||
2751 | RunSkipBlockVars[j].block_var_bytepos - | |||
2752 | RunSkipBlockVars[j-1].block_var_bytepos - RunSkipBlockVars[j-1].block_var_size; | |||
2753 | size_in_bytes += gap; | |||
2754 | } | |||
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; | |||
2760 | } | |||
2761 | ||||
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; | |||
2769 | } | |||
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); | |||
2775 | } | |||
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); | |||
2780 | } | |||
2781 | } | |||
2782 | ||||
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) | |||
2787 | Layout.pop_back(); | |||
2788 | else | |||
2789 | break; | |||
2790 | } | |||
2791 | ||||
2792 | uint64_t Result = InlineLayoutInstruction(Layout); | |||
2793 | if (Result != 0) { | |||
2794 | // Block variable layout instruction has been inlined. | |||
2795 | if (CGM.getLangOpts().ObjCGCBitmapPrint) { | |||
2796 | if (ComputeByrefLayout) | |||
2797 | printf("\n Inline BYREF variable layout: "); | |||
2798 | else | |||
2799 | printf("\n Inline block variable layout: "); | |||
2800 | printf("0x0%" PRIx64"l" "x" "", 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"); | |||
2808 | } | |||
2809 | return llvm::ConstantInt::get(CGM.IntPtrTy, Result); | |||
2810 | } | |||
2811 | ||||
2812 | unsigned char inst = (BLOCK_LAYOUT_OPERATOR << 4) | 0; | |||
2813 | Layout.push_back(inst); | |||
2814 | std::string BitMap; | |||
2815 | for (unsigned i = 0, e = Layout.size(); i != e; i++) | |||
2816 | BitMap += Layout[i]; | |||
2817 | ||||
2818 | if (CGM.getLangOpts().ObjCGCBitmapPrint) { | |||
2819 | if (ComputeByrefLayout) | |||
2820 | printf("\n Byref variable layout: "); | |||
2821 | else | |||
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); | |||
2826 | unsigned delta = 1; | |||
2827 | switch (opcode) { | |||
2828 | case BLOCK_LAYOUT_OPERATOR: | |||
2829 | printf("BL_OPERATOR:"); | |||
2830 | delta = 0; | |||
2831 | break; | |||
2832 | case BLOCK_LAYOUT_NON_OBJECT_BYTES: | |||
2833 | printf("BL_NON_OBJECT_BYTES:"); | |||
2834 | break; | |||
2835 | case BLOCK_LAYOUT_NON_OBJECT_WORDS: | |||
2836 | printf("BL_NON_OBJECT_WORD:"); | |||
2837 | break; | |||
2838 | case BLOCK_LAYOUT_STRONG: | |||
2839 | printf("BL_STRONG:"); | |||
2840 | break; | |||
2841 | case BLOCK_LAYOUT_BYREF: | |||
2842 | printf("BL_BYREF:"); | |||
2843 | break; | |||
2844 | case BLOCK_LAYOUT_WEAK: | |||
2845 | printf("BL_WEAK:"); | |||
2846 | break; | |||
2847 | case BLOCK_LAYOUT_UNRETAINED: | |||
2848 | printf("BL_UNRETAINED:"); | |||
2849 | break; | |||
2850 | } | |||
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); | |||
2854 | if (i < e-1) | |||
2855 | printf(", "); | |||
2856 | else | |||
2857 | printf("\n"); | |||
2858 | } | |||
2859 | } | |||
2860 | ||||
2861 | auto *Entry = CreateCStringLiteral(BitMap, ObjCLabelType::ClassName, | |||
2862 | /*ForceNonFragileABI=*/true, | |||
2863 | /*NullTerminate=*/false); | |||
2864 | return getConstantGEP(VMContext, Entry, 0, 0); | |||
2865 | } | |||
2866 | ||||
2867 | static std::string getBlockLayoutInfoString( | |||
2868 | const SmallVectorImpl<CGObjCCommonMac::RUN_SKIP> &RunSkipBlockVars, | |||
2869 | bool HasCopyDisposeHelpers) { | |||
2870 | std::string Str; | |||
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. | |||
2875 | Str += "u"; | |||
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). | |||
2881 | continue; | |||
2882 | } else { | |||
2883 | switch (R.opcode) { | |||
2884 | case CGObjCCommonMac::BLOCK_LAYOUT_STRONG: | |||
2885 | Str += "s"; | |||
2886 | break; | |||
2887 | case CGObjCCommonMac::BLOCK_LAYOUT_BYREF: | |||
2888 | Str += "r"; | |||
2889 | break; | |||
2890 | case CGObjCCommonMac::BLOCK_LAYOUT_WEAK: | |||
2891 | Str += "w"; | |||
2892 | break; | |||
2893 | default: | |||
2894 | continue; | |||
2895 | } | |||
2896 | } | |||
2897 | Str += llvm::to_string(R.block_var_bytepos.getQuantity()); | |||
2898 | Str += "l" + llvm::to_string(R.block_var_size.getQuantity()); | |||
2899 | } | |||
2900 | return Str; | |||
2901 | } | |||
2902 | ||||
2903 | void CGObjCCommonMac::fillRunSkipBlockVars(CodeGenModule &CGM, | |||
2904 | const CGBlockInfo &blockInfo) { | |||
2905 | assert(CGM.getLangOpts().getGC() == LangOptions::NonGC)((CGM.getLangOpts().getGC() == LangOptions::NonGC) ? static_cast <void> (0) : __assert_fail ("CGM.getLangOpts().getGC() == LangOptions::NonGC" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 2905, __PRETTY_FUNCTION__)); | |||
2906 | ||||
2907 | RunSkipBlockVars.clear(); | |||
2908 | bool hasUnion = false; | |||
2909 | ||||
2910 | unsigned WordSizeInBits = CGM.getTarget().getPointerWidth(0); | |||
2911 | unsigned ByteSizeInBits = CGM.getTarget().getCharWidth(); | |||
2912 | unsigned WordSizeInBytes = WordSizeInBits/ByteSizeInBits; | |||
2913 | ||||
2914 | const BlockDecl *blockDecl = blockInfo.getBlockDecl(); | |||
2915 | ||||
2916 | // Calculate the basic layout of the block structure. | |||
2917 | const llvm::StructLayout *layout = | |||
2918 | CGM.getDataLayout().getStructLayout(blockInfo.StructureType); | |||
2919 | ||||
2920 | // Ignore the optional 'this' capture: C++ objects are not assumed | |||
2921 | // to be GC'ed. | |||
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(); | |||
2930 | ||||
2931 | const CGBlockInfo::Capture &capture = blockInfo.getCapture(variable); | |||
2932 | ||||
2933 | // Ignore constant captures. | |||
2934 | if (capture.isConstant()) continue; | |||
2935 | ||||
2936 | CharUnits fieldOffset = | |||
2937 | CharUnits::fromQuantity(layout->getElementOffset(capture.getIndex())); | |||
2938 | ||||
2939 | assert(!type->isArrayType() && "array variable should not be caught")((!type->isArrayType() && "array variable should not be caught" ) ? static_cast<void> (0) : __assert_fail ("!type->isArrayType() && \"array variable should not be caught\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 2939, __PRETTY_FUNCTION__)); | |||
2940 | if (!CI.isByRef()) | |||
2941 | if (const RecordType *record = type->getAs<RecordType>()) { | |||
2942 | BuildRCBlockVarRecordLayout(record, fieldOffset, hasUnion); | |||
2943 | continue; | |||
2944 | } | |||
2945 | CharUnits fieldSize; | |||
2946 | if (CI.isByRef()) | |||
2947 | fieldSize = CharUnits::fromQuantity(WordSizeInBytes); | |||
2948 | else | |||
2949 | fieldSize = CGM.getContext().getTypeSizeInChars(type); | |||
2950 | UpdateRunSkipBlockVars(CI.isByRef(), getBlockCaptureLifetime(type, false), | |||
2951 | fieldOffset, fieldSize); | |||
2952 | } | |||
2953 | } | |||
2954 | ||||
2955 | llvm::Constant * | |||
2956 | CGObjCCommonMac::BuildRCBlockLayout(CodeGenModule &CGM, | |||
2957 | const CGBlockInfo &blockInfo) { | |||
2958 | fillRunSkipBlockVars(CGM, blockInfo); | |||
2959 | return getBitmapBlockLayout(false); | |||
2960 | } | |||
2961 | ||||
2962 | std::string CGObjCCommonMac::getRCBlockLayoutStr(CodeGenModule &CGM, | |||
2963 | const CGBlockInfo &blockInfo) { | |||
2964 | fillRunSkipBlockVars(CGM, blockInfo); | |||
2965 | return getBlockLayoutInfoString(RunSkipBlockVars, | |||
2966 | blockInfo.needsCopyDisposeHelpers()); | |||
2967 | } | |||
2968 | ||||
2969 | llvm::Constant *CGObjCCommonMac::BuildByrefLayout(CodeGen::CodeGenModule &CGM, | |||
2970 | QualType T) { | |||
2971 | assert(CGM.getLangOpts().getGC() == LangOptions::NonGC)((CGM.getLangOpts().getGC() == LangOptions::NonGC) ? static_cast <void> (0) : __assert_fail ("CGM.getLangOpts().getGC() == LangOptions::NonGC" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 2971, __PRETTY_FUNCTION__)); | |||
2972 | assert(!T->isArrayType() && "__block array variable should not be caught")((!T->isArrayType() && "__block array variable should not be caught" ) ? static_cast<void> (0) : __assert_fail ("!T->isArrayType() && \"__block array variable should not be caught\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 2972, __PRETTY_FUNCTION__)); | |||
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); | |||
2981 | return Result; | |||
2982 | } | |||
2983 | llvm::Constant *nullPtr = llvm::Constant::getNullValue(CGM.Int8PtrTy); | |||
2984 | return nullPtr; | |||
2985 | } | |||
2986 | ||||
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")); | |||
2992 | ||||
2993 | return llvm::ConstantExpr::getBitCast(GetProtocolRef(PD), | |||
2994 | ObjCTypes.getExternalProtocolPtrTy()); | |||
2995 | } | |||
2996 | ||||
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()); | |||
3001 | ||||
3002 | // If we have generated a forward reference to this protocol, emit | |||
3003 | // it now. Otherwise do nothing, the protocol objects are lazily | |||
3004 | // emitted. | |||
3005 | if (Protocols.count(PD->getIdentifier())) | |||
3006 | GetOrEmitProtocol(PD); | |||
3007 | } | |||
3008 | ||||
3009 | llvm::Constant *CGObjCCommonMac::GetProtocolRef(const ObjCProtocolDecl *PD) { | |||
3010 | if (DefinedProtocols.count(PD->getIdentifier())) | |||
3011 | return GetOrEmitProtocol(PD); | |||
3012 | ||||
3013 | return GetOrEmitProtocolRef(PD); | |||
3014 | } | |||
3015 | ||||
3016 | llvm::Value *CGObjCCommonMac::EmitClassRefViaRuntime( | |||
3017 | CodeGenFunction &CGF, | |||
3018 | const ObjCInterfaceDecl *ID, | |||
3019 | ObjCCommonTypesHelper &ObjCTypes) { | |||
3020 | llvm::FunctionCallee lookUpClassFn = ObjCTypes.getLookUpClassFn(); | |||
3021 | ||||
3022 | llvm::Value *className = | |||
3023 | CGF.CGM.GetAddrOfConstantCString(ID->getObjCRuntimeNameAsString()) | |||
3024 | .getPointer(); | |||
3025 | ASTContext &ctx = CGF.CGM.getContext(); | |||
3026 | className = | |||
3027 | CGF.Builder.CreateBitCast(className, | |||
3028 | CGF.ConvertType( | |||
3029 | ctx.getPointerType(ctx.CharTy.withConst()))); | |||
3030 | llvm::CallInst *call = CGF.Builder.CreateCall(lookUpClassFn, className); | |||
3031 | call->setDoesNotThrow(); | |||
3032 | return call; | |||
3033 | } | |||
3034 | ||||
3035 | /* | |||
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 | |||
3043 | }; | |||
3044 | ||||
3045 | See EmitProtocolExtension(). | |||
3046 | */ | |||
3047 | llvm::Constant *CGObjCMac::GetOrEmitProtocol(const ObjCProtocolDecl *PD) { | |||
3048 | llvm::GlobalVariable *Entry = Protocols[PD->getIdentifier()]; | |||
3049 | ||||
3050 | // Early exit if a defining object has already been generated. | |||
3051 | if (Entry && Entry->hasInitializer()) | |||
3052 | return Entry; | |||
3053 | ||||
3054 | // Use the protocol definition, if there is one. | |||
3055 | if (const ObjCProtocolDecl *Def = PD->getDefinition()) | |||
3056 | PD = Def; | |||
3057 | ||||
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")); | |||
3061 | ||||
3062 | // Construct method lists. | |||
3063 | auto methodLists = ProtocolMethodLists::get(PD); | |||
3064 | ||||
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)); | |||
3075 | ||||
3076 | if (Entry) { | |||
3077 | // Already created, update the initializer. | |||
3078 | assert(Entry->hasPrivateLinkage())((Entry->hasPrivateLinkage()) ? static_cast<void> (0 ) : __assert_fail ("Entry->hasPrivateLinkage()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 3078, __PRETTY_FUNCTION__)); | |||
3079 | values.finishAndSetAsInitializer(Entry); | |||
3080 | } else { | |||
3081 | Entry = values.finishAndCreateGlobal("OBJC_PROTOCOL_" + PD->getName(), | |||
3082 | CGM.getPointerAlign(), | |||
3083 | /*constant*/ false, | |||
3084 | llvm::GlobalValue::PrivateLinkage); | |||
3085 | Entry->setSection("__OBJC,__protocol,regular,no_dead_strip"); | |||
3086 | ||||
3087 | Protocols[PD->getIdentifier()] = Entry; | |||
3088 | } | |||
3089 | CGM.addCompilerUsedGlobal(Entry); | |||
3090 | ||||
3091 | return Entry; | |||
3092 | } | |||
3093 | ||||
3094 | llvm::Constant *CGObjCMac::GetOrEmitProtocolRef(const ObjCProtocolDecl *PD) { | |||
3095 | llvm::GlobalVariable *&Entry = Protocols[PD->getIdentifier()]; | |||
3096 | ||||
3097 | if (!Entry) { | |||
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); | |||
3107 | } | |||
3108 | ||||
3109 | return Entry; | |||
3110 | } | |||
3111 | ||||
3112 | /* | |||
3113 | struct _objc_protocol_extension { | |||
3114 | uint32_t size; | |||
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; | |||
3120 | }; | |||
3121 | */ | |||
3122 | llvm::Constant * | |||
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); | |||
3131 | ||||
3132 | auto extendedMethodTypes = | |||
3133 | EmitProtocolMethodTypes("OBJC_PROTOCOL_METHOD_TYPES_" + PD->getName(), | |||
3134 | methodLists.emitExtendedTypesArray(this), | |||
3135 | ObjCTypes); | |||
3136 | ||||
3137 | auto instanceProperties = | |||
3138 | EmitPropertyList("OBJC_$_PROP_PROTO_LIST_" + PD->getName(), nullptr, PD, | |||
3139 | ObjCTypes, false); | |||
3140 | auto classProperties = | |||
3141 | EmitPropertyList("OBJC_$_CLASS_PROP_PROTO_LIST_" + PD->getName(), nullptr, | |||
3142 | PD, ObjCTypes, true); | |||
3143 | ||||
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); | |||
3151 | } | |||
3152 | ||||
3153 | uint64_t size = | |||
3154 | CGM.getDataLayout().getTypeAllocSize(ObjCTypes.ProtocolExtensionTy); | |||
3155 | ||||
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); | |||
3164 | ||||
3165 | // No special section, but goes in llvm.used | |||
3166 | return CreateMetadataVar("_OBJC_PROTOCOLEXT_" + PD->getName(), values, | |||
3167 | StringRef(), CGM.getPointerAlign(), true); | |||
3168 | } | |||
3169 | ||||
3170 | /* | |||
3171 | struct objc_protocol_list { | |||
3172 | struct objc_protocol_list *next; | |||
3173 | long count; | |||
3174 | Protocol *list[]; | |||
3175 | }; | |||
3176 | */ | |||
3177 | llvm::Constant * | |||
3178 | CGObjCMac::EmitProtocolList(Twine name, | |||
3179 | ObjCProtocolDecl::protocol_iterator begin, | |||
3180 | ObjCProtocolDecl::protocol_iterator end) { | |||
3181 | // Just return null for empty protocol lists | |||
3182 | if (begin == end) | |||
3183 | return llvm::Constant::getNullValue(ObjCTypes.ProtocolListPtrTy); | |||
3184 | ||||
3185 | ConstantInitBuilder builder(CGM); | |||
3186 | auto values = builder.beginStruct(); | |||
3187 | ||||
3188 | // This field is only used by the runtime. | |||
3189 | values.addNullPointer(ObjCTypes.ProtocolListPtrTy); | |||
3190 | ||||
3191 | // Reserve a slot for the count. | |||
3192 | auto countSlot = values.addPlaceholder(); | |||
3193 | ||||
3194 | auto refsArray = values.beginArray(ObjCTypes.ProtocolPtrTy); | |||
3195 | for (; begin != end; ++begin) { | |||
3196 | refsArray.add(GetProtocolRef(*begin)); | |||
3197 | } | |||
3198 | auto count = refsArray.size(); | |||
3199 | ||||
3200 | // This list is null terminated. | |||
3201 | refsArray.addNullPointer(ObjCTypes.ProtocolPtrTy); | |||
3202 | ||||
3203 | refsArray.finishAndAddTo(values); | |||
3204 | values.fillPlaceholderWithInt(countSlot, ObjCTypes.LongTy, count); | |||
3205 | ||||
3206 | StringRef section; | |||
3207 | if (CGM.getTriple().isOSBinFormatMachO()) | |||
3208 | section = "__OBJC,__cat_cls_meth,regular,no_dead_strip"; | |||
3209 | ||||
3210 | llvm::GlobalVariable *GV = | |||
3211 | CreateMetadataVar(name, values, section, CGM.getPointerAlign(), false); | |||
3212 | return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.ProtocolListPtrTy); | |||
3213 | } | |||
3214 | ||||
3215 | static void | |||
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); | |||
3222 | ||||
3223 | for (const auto *PD : Proto->properties()) { | |||
3224 | if (IsClassProperty != PD->isClassProperty()) | |||
3225 | continue; | |||
3226 | if (!PropertySet.insert(PD->getIdentifier()).second) | |||
3227 | continue; | |||
3228 | Properties.push_back(PD); | |||
3229 | } | |||
3230 | } | |||
3231 | ||||
3232 | /* | |||
3233 | struct _objc_property { | |||
3234 | const char * const name; | |||
3235 | const char * const attributes; | |||
3236 | }; | |||
3237 | ||||
3238 | struct _objc_property_list { | |||
3239 | uint32_t entsize; // sizeof (struct _objc_property) | |||
3240 | uint32_t prop_count; | |||
3241 | struct _objc_property[prop_count]; | |||
3242 | }; | |||
3243 | */ | |||
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); | |||
3256 | } | |||
3257 | ||||
3258 | SmallVector<const ObjCPropertyDecl *, 16> Properties; | |||
3259 | llvm::SmallPtrSet<const IdentifierInfo*, 16> PropertySet; | |||
3260 | ||||
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()) | |||
3265 | continue; | |||
3266 | PropertySet.insert(PD->getIdentifier()); | |||
3267 | Properties.push_back(PD); | |||
3268 | } | |||
3269 | ||||
3270 | for (const auto *PD : OCD->properties()) { | |||
3271 | if (IsClassProperty != PD->isClassProperty()) | |||
3272 | continue; | |||
3273 | // Don't emit duplicate metadata for properties that were already in a | |||
3274 | // class extension. | |||
3275 | if (!PropertySet.insert(PD->getIdentifier()).second) | |||
3276 | continue; | |||
3277 | Properties.push_back(PD); | |||
3278 | } | |||
3279 | ||||
3280 | if (const ObjCInterfaceDecl *OID = dyn_cast<ObjCInterfaceDecl>(OCD)) { | |||
3281 | for (const auto *P : OID->all_referenced_protocols()) | |||
3282 | PushProtocolProperties(PropertySet, Properties, P, IsClassProperty); | |||
3283 | } | |||
3284 | else if (const ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(OCD)) { | |||
3285 | for (const auto *P : CD->protocols()) | |||
3286 | PushProtocolProperties(PropertySet, Properties, P, IsClassProperty); | |||
3287 | } | |||
3288 | ||||
3289 | // Return null for empty list. | |||
3290 | if (Properties.empty()) | |||
3291 | return llvm::Constant::getNullValue(ObjCTypes.PropertyListPtrTy); | |||
3292 | ||||
3293 | unsigned propertySize = | |||
3294 | CGM.getDataLayout().getTypeAllocSize(ObjCTypes.PropertyTy); | |||
3295 | ||||
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); | |||
3306 | } | |||
3307 | propertiesArray.finishAndAddTo(values); | |||
3308 | ||||
3309 | StringRef Section; | |||
3310 | if (CGM.getTriple().isOSBinFormatMachO()) | |||
3311 | Section = (ObjCABI == 2) ? "__DATA, __objc_const" | |||
3312 | : "__OBJC,__property,regular,no_dead_strip"; | |||
3313 | ||||
3314 | llvm::GlobalVariable *GV = | |||
3315 | CreateMetadataVar(Name, values, Section, CGM.getPointerAlign(), true); | |||
3316 | return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.PropertyListPtrTy); | |||
3317 | } | |||
3318 | ||||
3319 | llvm::Constant * | |||
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); | |||
3326 | ||||
3327 | llvm::ArrayType *AT = llvm::ArrayType::get(ObjCTypes.Int8PtrTy, | |||
3328 | MethodTypes.size()); | |||
3329 | llvm::Constant *Init = llvm::ConstantArray::get(AT, MethodTypes); | |||
3330 | ||||
3331 | StringRef Section; | |||
3332 | if (CGM.getTriple().isOSBinFormatMachO() && ObjCABI == 2) | |||
3333 | Section = "__DATA, __objc_const"; | |||
3334 | ||||
3335 | llvm::GlobalVariable *GV = | |||
3336 | CreateMetadataVar(Name, Init, Section, CGM.getPointerAlign(), true); | |||
3337 | return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.Int8PtrPtrTy); | |||
3338 | } | |||
3339 | ||||
3340 | /* | |||
3341 | struct _objc_category { | |||
3342 | char *category_name; | |||
3343 | char *class_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; | |||
3350 | }; | |||
3351 | */ | |||
3352 | void CGObjCMac::GenerateCategory(const ObjCCategoryImplDecl *OCD) { | |||
3353 | unsigned Size = CGM.getDataLayout().getTypeAllocSize(ObjCTypes.CategoryTy); | |||
3354 | ||||
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()); | |||
3362 | ||||
3363 | SmallString<256> ExtName; | |||
3364 | llvm::raw_svector_ostream(ExtName) << Interface->getName() << '_' | |||
3365 | << OCD->getName(); | |||
3366 | ||||
3367 | ConstantInitBuilder Builder(CGM); | |||
3368 | auto Values = Builder.beginStruct(ObjCTypes.CategoryTy); | |||
3369 | ||||
3370 | enum { | |||
3371 | InstanceMethods, | |||
3372 | ClassMethods, | |||
3373 | NumMethodLists | |||
3374 | }; | |||
3375 | SmallVector<const ObjCMethodDecl *, 16> Methods[NumMethodLists]; | |||
3376 | for (const auto *MD : OCD->methods()) { | |||
3377 | Methods[unsigned(MD->isClassMethod())].push_back(MD); | |||
3378 | } | |||
3379 | ||||
3380 | Values.add(GetClassName(OCD->getName())); | |||
3381 | Values.add(GetClassName(Interface->getObjCRuntimeNameAsString())); | |||
3382 | LazySymbols.insert(Interface->getIdentifier()); | |||
3383 | ||||
3384 | Values.add(emitMethodList(ExtName, MethodListType::CategoryInstanceMethods, | |||
3385 | Methods[InstanceMethods])); | |||
3386 | Values.add(emitMethodList(ExtName, MethodListType::CategoryClassMethods, | |||
3387 | Methods[ClassMethods])); | |||
3388 | if (Category) { | |||
3389 | Values.add( | |||
3390 | EmitProtocolList("OBJC_CATEGORY_PROTOCOLS_" + ExtName.str(), | |||
3391 | Category->protocol_begin(), Category->protocol_end())); | |||
3392 | } else { | |||
3393 | Values.addNullPointer(ObjCTypes.ProtocolListPtrTy); | |||
3394 | } | |||
3395 | Values.addInt(ObjCTypes.IntTy, Size); | |||
3396 | ||||
3397 | // If there is no category @interface then there can be no properties. | |||
3398 | if (Category) { | |||
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)); | |||
3403 | } else { | |||
3404 | Values.addNullPointer(ObjCTypes.PropertyListPtrTy); | |||
3405 | Values.addNullPointer(ObjCTypes.PropertyListPtrTy); | |||
3406 | } | |||
3407 | ||||
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(); | |||
3416 | } | |||
3417 | ||||
3418 | enum FragileClassFlags { | |||
3419 | /// Apparently: is not a meta-class. | |||
3420 | FragileABI_Class_Factory = 0x00001, | |||
3421 | ||||
3422 | /// Is a meta-class. | |||
3423 | FragileABI_Class_Meta = 0x00002, | |||
3424 | ||||
3425 | /// Has a non-trivial constructor or destructor. | |||
3426 | FragileABI_Class_HasCXXStructors = 0x02000, | |||
3427 | ||||
3428 | /// Has hidden visibility. | |||
3429 | FragileABI_Class_Hidden = 0x20000, | |||
3430 | ||||
3431 | /// Class implementation was compiled under ARC. | |||
3432 | FragileABI_Class_CompiledByARC = 0x04000000, | |||
3433 | ||||
3434 | /// Class implementation was compiled under MRC and has MRC weak ivars. | |||
3435 | /// Exclusive with CompiledByARC. | |||
3436 | FragileABI_Class_HasMRCWeakIvars = 0x08000000, | |||
3437 | }; | |||
3438 | ||||
3439 | enum NonFragileClassFlags { | |||
3440 | /// Is a meta-class. | |||
3441 | NonFragileABI_Class_Meta = 0x00001, | |||
3442 | ||||
3443 | /// Is a root class. | |||
3444 | NonFragileABI_Class_Root = 0x00002, | |||
3445 | ||||
3446 | /// Has a non-trivial constructor or destructor. | |||
3447 | NonFragileABI_Class_HasCXXStructors = 0x00004, | |||
3448 | ||||
3449 | /// Has hidden visibility. | |||
3450 | NonFragileABI_Class_Hidden = 0x00010, | |||
3451 | ||||
3452 | /// Has the exception attribute. | |||
3453 | NonFragileABI_Class_Exception = 0x00020, | |||
3454 | ||||
3455 | /// (Obsolete) ARC-specific: this class has a .release_ivars method | |||
3456 | NonFragileABI_Class_HasIvarReleaser = 0x00040, | |||
3457 | ||||
3458 | /// Class implementation was compiled under ARC. | |||
3459 | NonFragileABI_Class_CompiledByARC = 0x00080, | |||
3460 | ||||
3461 | /// Class has non-trivial destructors, but zero-initialization is okay. | |||
3462 | NonFragileABI_Class_HasCXXDestructorOnly = 0x00100, | |||
3463 | ||||
3464 | /// Class implementation was compiled under MRC and has MRC weak ivars. | |||
3465 | /// Exclusive with CompiledByARC. | |||
3466 | NonFragileABI_Class_HasMRCWeakIvars = 0x00200, | |||
3467 | }; | |||
3468 | ||||
3469 | static bool hasWeakMember(QualType type) { | |||
3470 | if (type.getObjCLifetime() == Qualifiers::OCL_Weak) { | |||
3471 | return true; | |||
3472 | } | |||
3473 | ||||
3474 | if (auto recType = type->getAs<RecordType>()) { | |||
3475 | for (auto field : recType->getDecl()->fields()) { | |||
3476 | if (hasWeakMember(field->getType())) | |||
3477 | return true; | |||
3478 | } | |||
3479 | } | |||
3480 | ||||
3481 | return false; | |||
3482 | } | |||
3483 | ||||
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 | |||
3486 | /// __weak ivars. | |||
3487 | static bool hasMRCWeakIvars(CodeGenModule &CGM, | |||
3488 | const ObjCImplementationDecl *ID) { | |||
3489 | if (!CGM.getLangOpts().ObjCWeak) return false; | |||
3490 | assert(CGM.getLangOpts().getGC() == LangOptions::NonGC)((CGM.getLangOpts().getGC() == LangOptions::NonGC) ? static_cast <void> (0) : __assert_fail ("CGM.getLangOpts().getGC() == LangOptions::NonGC" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 3490, __PRETTY_FUNCTION__)); | |||
3491 | ||||
3492 | for (const ObjCIvarDecl *ivar = | |||
3493 | ID->getClassInterface()->all_declared_ivar_begin(); | |||
3494 | ivar; ivar = ivar->getNextIvar()) { | |||
3495 | if (hasWeakMember(ivar->getType())) | |||
3496 | return true; | |||
3497 | } | |||
3498 | ||||
3499 | return false; | |||
3500 | } | |||
3501 | ||||
3502 | /* | |||
3503 | struct _objc_class { | |||
3504 | Class isa; | |||
3505 | Class super_class; | |||
3506 | const char *name; | |||
3507 | long version; | |||
3508 | long info; | |||
3509 | long instance_size; | |||
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; | |||
3517 | }; | |||
3518 | ||||
3519 | See EmitClassExtension(); | |||
3520 | */ | |||
3521 | void CGObjCMac::GenerateClass(const ObjCImplementationDecl *ID) { | |||
3522 | IdentifierInfo *RuntimeName = | |||
3523 | &CGM.getContext().Idents.get(ID->getObjCRuntimeNameAsString()); | |||
3524 | DefinedSymbols.insert(RuntimeName); | |||
3525 | ||||
3526 | std::string ClassName = ID->getNameAsString(); | |||
3527 | // FIXME: Gross | |||
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; | |||
3537 | ||||
3538 | bool hasMRCWeak = false; | |||
3539 | ||||
3540 | if (CGM.getLangOpts().ObjCAutoRefCount) | |||
3541 | Flags |= FragileABI_Class_CompiledByARC; | |||
3542 | else if ((hasMRCWeak = hasMRCWeakIvars(CGM, ID))) | |||
3543 | Flags |= FragileABI_Class_HasMRCWeakIvars; | |||
3544 | ||||
3545 | CharUnits Size = | |||
3546 | CGM.getContext().getASTObjCImplementationLayout(ID).getSize(); | |||
3547 | ||||
3548 | // FIXME: Set CXX-structors flag. | |||
3549 | if (ID->getClassInterface()->getVisibility() == HiddenVisibility) | |||
3550 | Flags |= FragileABI_Class_Hidden; | |||
3551 | ||||
3552 | enum { | |||
3553 | InstanceMethods, | |||
3554 | ClassMethods, | |||
3555 | NumMethodLists | |||
3556 | }; | |||
3557 | SmallVector<const ObjCMethodDecl *, 16> Methods[NumMethodLists]; | |||
3558 | for (const auto *MD : ID->methods()) { | |||
3559 | Methods[unsigned(MD->isClassMethod())].push_back(MD); | |||
3560 | } | |||
3561 | ||||
3562 | for (const auto *PID : ID->property_impls()) { | |||
3563 | if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize) { | |||
3564 | ObjCPropertyDecl *PD = PID->getPropertyDecl(); | |||
3565 | ||||
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); | |||
3572 | } | |||
3573 | } | |||
3574 | ||||
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()); | |||
3581 | ||||
3582 | values.addBitCast(GetClassName(Super->getObjCRuntimeNameAsString()), | |||
3583 | ObjCTypes.ClassPtrTy); | |||
3584 | } else { | |||
3585 | values.addNullPointer(ObjCTypes.ClassPtrTy); | |||
3586 | } | |||
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)); | |||
3601 | ||||
3602 | std::string Name("OBJC_CLASS_"); | |||
3603 | Name += ClassName; | |||
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); | |||
3607 | if (GV) { | |||
3608 | assert(GV->getType()->getElementType() == ObjCTypes.ClassTy &&((GV->getType()->getElementType() == ObjCTypes.ClassTy && "Forward metaclass reference has incorrect type.") ? static_cast <void> (0) : __assert_fail ("GV->getType()->getElementType() == ObjCTypes.ClassTy && \"Forward metaclass reference has incorrect type.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 3609, __PRETTY_FUNCTION__)) | |||
3609 | "Forward metaclass reference has incorrect type.")((GV->getType()->getElementType() == ObjCTypes.ClassTy && "Forward metaclass reference has incorrect type.") ? static_cast <void> (0) : __assert_fail ("GV->getType()->getElementType() == ObjCTypes.ClassTy && \"Forward metaclass reference has incorrect type.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 3609, __PRETTY_FUNCTION__)); | |||
3610 | values.finishAndSetAsInitializer(GV); | |||
3611 | GV->setSection(Section); | |||
3612 | GV->setAlignment(CGM.getPointerAlign().getQuantity()); | |||
3613 | CGM.addCompilerUsedGlobal(GV); | |||
3614 | } else | |||
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(); | |||
3620 | } | |||
3621 | ||||
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); | |||
3627 | ||||
3628 | if (ID->getClassInterface()->getVisibility() == HiddenVisibility) | |||
3629 | Flags |= FragileABI_Class_Hidden; | |||
3630 | ||||
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()) | |||
3636 | Root = Super; | |||
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); | |||
3645 | } else { | |||
3646 | values.addNullPointer(ObjCTypes.ClassPtrTy); | |||
3647 | } | |||
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, | |||
3655 | Methods)); | |||
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)); | |||
3664 | ||||
3665 | std::string Name("OBJC_METACLASS_"); | |||
3666 | Name += ID->getName(); | |||
3667 | ||||
3668 | // Check for a forward reference. | |||
3669 | llvm::GlobalVariable *GV = CGM.getModule().getGlobalVariable(Name, true); | |||
3670 | if (GV) { | |||
3671 | assert(GV->getType()->getElementType() == ObjCTypes.ClassTy &&((GV->getType()->getElementType() == ObjCTypes.ClassTy && "Forward metaclass reference has incorrect type.") ? static_cast <void> (0) : __assert_fail ("GV->getType()->getElementType() == ObjCTypes.ClassTy && \"Forward metaclass reference has incorrect type.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 3672, __PRETTY_FUNCTION__)) | |||
3672 | "Forward metaclass reference has incorrect type.")((GV->getType()->getElementType() == ObjCTypes.ClassTy && "Forward metaclass reference has incorrect type.") ? static_cast <void> (0) : __assert_fail ("GV->getType()->getElementType() == ObjCTypes.ClassTy && \"Forward metaclass reference has incorrect type.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 3672, __PRETTY_FUNCTION__)); | |||
3673 | values.finishAndSetAsInitializer(GV); | |||
3674 | } else { | |||
3675 | GV = values.finishAndCreateGlobal(Name, CGM.getPointerAlign(), | |||
3676 | /*constant*/ false, | |||
3677 | llvm::GlobalValue::PrivateLinkage); | |||
3678 | } | |||
3679 | GV->setSection("__OBJC,__meta_class,regular,no_dead_strip"); | |||
3680 | CGM.addCompilerUsedGlobal(GV); | |||
3681 | ||||
3682 | return GV; | |||
3683 | } | |||
3684 | ||||
3685 | llvm::Constant *CGObjCMac::EmitMetaClassRef(const ObjCInterfaceDecl *ID) { | |||
3686 | std::string Name = "OBJC_METACLASS_" + ID->getNameAsString(); | |||
3687 | ||||
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. | |||
3692 | ||||
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); | |||
3697 | if (!GV) | |||
3698 | GV = new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.ClassTy, false, | |||
3699 | llvm::GlobalValue::PrivateLinkage, nullptr, | |||
3700 | Name); | |||
3701 | ||||
3702 | assert(GV->getType()->getElementType() == ObjCTypes.ClassTy &&((GV->getType()->getElementType() == ObjCTypes.ClassTy && "Forward metaclass reference has incorrect type.") ? static_cast <void> (0) : __assert_fail ("GV->getType()->getElementType() == ObjCTypes.ClassTy && \"Forward metaclass reference has incorrect type.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 3703, __PRETTY_FUNCTION__)) | |||
3703 | "Forward metaclass reference has incorrect type.")((GV->getType()->getElementType() == ObjCTypes.ClassTy && "Forward metaclass reference has incorrect type.") ? static_cast <void> (0) : __assert_fail ("GV->getType()->getElementType() == ObjCTypes.ClassTy && \"Forward metaclass reference has incorrect type.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 3703, __PRETTY_FUNCTION__)); | |||
3704 | return GV; | |||
3705 | } | |||
3706 | ||||
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); | |||
3710 | ||||
3711 | if (!GV) | |||
3712 | GV = new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.ClassTy, false, | |||
3713 | llvm::GlobalValue::PrivateLinkage, nullptr, | |||
3714 | Name); | |||
3715 | ||||
3716 | assert(GV->getType()->getElementType() == ObjCTypes.ClassTy &&((GV->getType()->getElementType() == ObjCTypes.ClassTy && "Forward class metadata reference has incorrect type.") ? static_cast <void> (0) : __assert_fail ("GV->getType()->getElementType() == ObjCTypes.ClassTy && \"Forward class metadata reference has incorrect type.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 3717, __PRETTY_FUNCTION__)) | |||
3717 | "Forward class metadata reference has incorrect type.")((GV->getType()->getElementType() == ObjCTypes.ClassTy && "Forward class metadata reference has incorrect type.") ? static_cast <void> (0) : __assert_fail ("GV->getType()->getElementType() == ObjCTypes.ClassTy && \"Forward class metadata reference has incorrect type.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 3717, __PRETTY_FUNCTION__)); | |||
3718 | return GV; | |||
3719 | } | |||
3720 | ||||
3721 | /* | |||
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. | |||
3725 | ||||
3726 | struct objc_class_ext { | |||
3727 | uint32_t size; | |||
3728 | const char *weak_ivar_layout; | |||
3729 | struct _objc_property_list *properties; | |||
3730 | }; | |||
3731 | */ | |||
3732 | llvm::Constant * | |||
3733 | CGObjCMac::EmitClassExtension(const ObjCImplementationDecl *ID, | |||
3734 | CharUnits InstanceSize, bool hasMRCWeakIvars, | |||
3735 | bool isMetaclass) { | |||
3736 | // Weak ivar layout. | |||
3737 | llvm::Constant *layout; | |||
3738 | if (isMetaclass) { | |||
3739 | layout = llvm::ConstantPointerNull::get(CGM.Int8PtrTy); | |||
3740 | } else { | |||
3741 | layout = BuildWeakIvarLayout(ID, CharUnits::Zero(), InstanceSize, | |||
3742 | hasMRCWeakIvars); | |||
3743 | } | |||
3744 | ||||
3745 | // Properties. | |||
3746 | llvm::Constant *propertyList = | |||
3747 | EmitPropertyList((isMetaclass ? Twine("_OBJC_$_CLASS_PROP_LIST_") | |||
3748 | : Twine("_OBJC_$_PROP_LIST_")) | |||
3749 | + ID->getName(), | |||
3750 | ID, ID->getClassInterface(), ObjCTypes, isMetaclass); | |||
3751 | ||||
3752 | // Return null if no extension bits are used. | |||
3753 | if (layout->isNullValue() && propertyList->isNullValue()) { | |||
3754 | return llvm::Constant::getNullValue(ObjCTypes.ClassExtensionPtrTy); | |||
3755 | } | |||
3756 | ||||
3757 | uint64_t size = | |||
3758 | CGM.getDataLayout().getTypeAllocSize(ObjCTypes.ClassExtensionTy); | |||
3759 | ||||
3760 | ConstantInitBuilder builder(CGM); | |||
3761 | auto values = builder.beginStruct(ObjCTypes.ClassExtensionTy); | |||
3762 | values.addInt(ObjCTypes.IntTy, size); | |||
3763 | values.add(layout); | |||
3764 | values.add(propertyList); | |||
3765 | ||||
3766 | return CreateMetadataVar("OBJC_CLASSEXT_" + ID->getName(), values, | |||
3767 | "__OBJC,__class_ext,regular,no_dead_strip", | |||
3768 | CGM.getPointerAlign(), true); | |||
3769 | } | |||
3770 | ||||
3771 | /* | |||
3772 | struct objc_ivar { | |||
3773 | char *ivar_name; | |||
3774 | char *ivar_type; | |||
3775 | int ivar_offset; | |||
3776 | }; | |||
3777 | ||||
3778 | struct objc_ivar_list { | |||
3779 | int ivar_count; | |||
3780 | struct objc_ivar list[count]; | |||
3781 | }; | |||
3782 | */ | |||
3783 | llvm::Constant *CGObjCMac::EmitIvarList(const ObjCImplementationDecl *ID, | |||
3784 | bool ForClass) { | |||
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 | |||
3789 | // for the class. | |||
3790 | if (ForClass) | |||
3791 | return llvm::Constant::getNullValue(ObjCTypes.IvarListPtrTy); | |||
3792 | ||||
3793 | const ObjCInterfaceDecl *OID = ID->getClassInterface(); | |||
3794 | ||||
3795 | ConstantInitBuilder builder(CGM); | |||
3796 | auto ivarList = builder.beginStruct(); | |||
3797 | auto countSlot = ivarList.addPlaceholder(); | |||
3798 | auto ivars = ivarList.beginArray(ObjCTypes.IvarTy); | |||
3799 | ||||
3800 | for (const ObjCIvarDecl *IVD = OID->all_declared_ivar_begin(); | |||
3801 | IVD; IVD = IVD->getNextIvar()) { | |||
3802 | // Ignore unnamed bit-fields. | |||
3803 | if (!IVD->getDeclName()) | |||
3804 | continue; | |||
3805 | ||||
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); | |||
3811 | } | |||
3812 | ||||
3813 | // Return null for empty list. | |||
3814 | auto count = ivars.size(); | |||
3815 | if (count == 0) { | |||
3816 | ivars.abandon(); | |||
3817 | ivarList.abandon(); | |||
3818 | return llvm::Constant::getNullValue(ObjCTypes.IvarListPtrTy); | |||
3819 | } | |||
3820 | ||||
3821 | ivars.finishAndAddTo(ivarList); | |||
3822 | ivarList.fillPlaceholderWithInt(countSlot, ObjCTypes.IntTy, count); | |||
3823 | ||||
3824 | llvm::GlobalVariable *GV; | |||
3825 | if (ForClass) | |||
3826 | GV = | |||
3827 | CreateMetadataVar("OBJC_CLASS_VARIABLES_" + ID->getName(), ivarList, | |||
3828 | "__OBJC,__class_vars,regular,no_dead_strip", | |||
3829 | CGM.getPointerAlign(), true); | |||
3830 | else | |||
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); | |||
3835 | } | |||
3836 | ||||
3837 | /// Build a struct objc_method_description constant for the given method. | |||
3838 | /// | |||
3839 | /// struct objc_method_description { | |||
3840 | /// SEL method_name; | |||
3841 | /// char *method_types; | |||
3842 | /// }; | |||
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); | |||
3850 | } | |||
3851 | ||||
3852 | /// Build a struct objc_method constant for the given method. | |||
3853 | /// | |||
3854 | /// struct objc_method { | |||
3855 | /// SEL method_name; | |||
3856 | /// char *method_types; | |||
3857 | /// void *method; | |||
3858 | /// }; | |||
3859 | void CGObjCMac::emitMethodConstant(ConstantArrayBuilder &builder, | |||
3860 | const ObjCMethodDecl *MD) { | |||
3861 | llvm::Function *fn = GetMethodDefinition(MD); | |||
3862 | assert(fn && "no definition registered for method")((fn && "no definition registered for method") ? static_cast <void> (0) : __assert_fail ("fn && \"no definition registered for method\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 3862, __PRETTY_FUNCTION__)); | |||
3863 | ||||
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); | |||
3870 | } | |||
3871 | ||||
3872 | /// Build a struct objc_method_list or struct objc_method_description_list, | |||
3873 | /// as appropriate. | |||
3874 | /// | |||
3875 | /// struct objc_method_list { | |||
3876 | /// struct objc_method_list *obsolete; | |||
3877 | /// int count; | |||
3878 | /// struct objc_method methods_list[count]; | |||
3879 | /// }; | |||
3880 | /// | |||
3881 | /// struct objc_method_description_list { | |||
3882 | /// int count; | |||
3883 | /// struct objc_method_description list[count]; | |||
3884 | /// }; | |||
3885 | llvm::Constant *CGObjCMac::emitMethodList(Twine name, MethodListType MLT, | |||
3886 | ArrayRef<const ObjCMethodDecl *> methods) { | |||
3887 | StringRef prefix; | |||
3888 | StringRef section; | |||
3889 | bool forProtocol = false; | |||
3890 | switch (MLT) { | |||
3891 | case MethodListType::CategoryInstanceMethods: | |||
3892 | prefix = "OBJC_CATEGORY_INSTANCE_METHODS_"; | |||
3893 | section = "__OBJC,__cat_inst_meth,regular,no_dead_strip"; | |||
3894 | forProtocol = false; | |||
3895 | break; | |||
3896 | case MethodListType::CategoryClassMethods: | |||
3897 | prefix = "OBJC_CATEGORY_CLASS_METHODS_"; | |||
3898 | section = "__OBJC,__cat_cls_meth,regular,no_dead_strip"; | |||
3899 | forProtocol = false; | |||
3900 | break; | |||
3901 | case MethodListType::InstanceMethods: | |||
3902 | prefix = "OBJC_INSTANCE_METHODS_"; | |||
3903 | section = "__OBJC,__inst_meth,regular,no_dead_strip"; | |||
3904 | forProtocol = false; | |||
3905 | break; | |||
3906 | case MethodListType::ClassMethods: | |||
3907 | prefix = "OBJC_CLASS_METHODS_"; | |||
3908 | section = "__OBJC,__cls_meth,regular,no_dead_strip"; | |||
3909 | forProtocol = false; | |||
3910 | break; | |||
3911 | case MethodListType::ProtocolInstanceMethods: | |||
3912 | prefix = "OBJC_PROTOCOL_INSTANCE_METHODS_"; | |||
3913 | section = "__OBJC,__cat_inst_meth,regular,no_dead_strip"; | |||
3914 | forProtocol = true; | |||
3915 | break; | |||
3916 | case MethodListType::ProtocolClassMethods: | |||
3917 | prefix = "OBJC_PROTOCOL_CLASS_METHODS_"; | |||
3918 | section = "__OBJC,__cat_cls_meth,regular,no_dead_strip"; | |||
3919 | forProtocol = true; | |||
3920 | break; | |||
3921 | case MethodListType::OptionalProtocolInstanceMethods: | |||
3922 | prefix = "OBJC_PROTOCOL_INSTANCE_METHODS_OPT_"; | |||
3923 | section = "__OBJC,__cat_inst_meth,regular,no_dead_strip"; | |||
3924 | forProtocol = true; | |||
3925 | break; | |||
3926 | case MethodListType::OptionalProtocolClassMethods: | |||
3927 | prefix = "OBJC_PROTOCOL_CLASS_METHODS_OPT_"; | |||
3928 | section = "__OBJC,__cat_cls_meth,regular,no_dead_strip"; | |||
3929 | forProtocol = true; | |||
3930 | break; | |||
3931 | } | |||
3932 | ||||
3933 | // Return null for empty list. | |||
3934 | if (methods.empty()) | |||
3935 | return llvm::Constant::getNullValue(forProtocol | |||
3936 | ? ObjCTypes.MethodDescriptionListPtrTy | |||
3937 | : ObjCTypes.MethodListPtrTy); | |||
3938 | ||||
3939 | // For protocols, this is an objc_method_description_list, which has | |||
3940 | // a slightly different structure. | |||
3941 | if (forProtocol) { | |||
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); | |||
3948 | } | |||
3949 | methodArray.finishAndAddTo(values); | |||
3950 | ||||
3951 | llvm::GlobalVariable *GV = CreateMetadataVar(prefix + name, values, section, | |||
3952 | CGM.getPointerAlign(), true); | |||
3953 | return llvm::ConstantExpr::getBitCast(GV, | |||
3954 | ObjCTypes.MethodDescriptionListPtrTy); | |||
3955 | } | |||
3956 | ||||
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); | |||
3965 | } | |||
3966 | methodArray.finishAndAddTo(values); | |||
3967 | ||||
3968 | llvm::GlobalVariable *GV = CreateMetadataVar(prefix + name, values, section, | |||
3969 | CGM.getPointerAlign(), true); | |||
3970 | return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.MethodListPtrTy); | |||
3971 | } | |||
3972 | ||||
3973 | llvm::Function *CGObjCCommonMac::GenerateMethod(const ObjCMethodDecl *OMD, | |||
3974 | const ObjCContainerDecl *CD) { | |||
3975 | SmallString<256> Name; | |||
3976 | GetNameForMethod(OMD, CD, Name); | |||
3977 | ||||
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, | |||
3984 | Name.str(), | |||
3985 | &CGM.getModule()); | |||
3986 | MethodDefinitions.insert(std::make_pair(OMD, Method)); | |||
3987 | ||||
3988 | return Method; | |||
3989 | } | |||
3990 | ||||
3991 | llvm::GlobalVariable *CGObjCCommonMac::CreateMetadataVar(Twine Name, | |||
3992 | ConstantStructBuilder &Init, | |||
3993 | StringRef Section, | |||
3994 | CharUnits Align, | |||
3995 | bool AddToUsed) { | |||
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); | |||
4002 | if (AddToUsed) | |||
4003 | CGM.addCompilerUsedGlobal(GV); | |||
4004 | return GV; | |||
4005 | } | |||
4006 | ||||
4007 | llvm::GlobalVariable *CGObjCCommonMac::CreateMetadataVar(Twine Name, | |||
4008 | llvm::Constant *Init, | |||
4009 | StringRef Section, | |||
4010 | CharUnits Align, | |||
4011 | bool AddToUsed) { | |||
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()); | |||
4020 | if (AddToUsed) | |||
4021 | CGM.addCompilerUsedGlobal(GV); | |||
4022 | return GV; | |||
4023 | } | |||
4024 | ||||
4025 | llvm::GlobalVariable * | |||
4026 | CGObjCCommonMac::CreateCStringLiteral(StringRef Name, ObjCLabelType Type, | |||
4027 | bool ForceNonFragileABI, | |||
4028 | bool NullTerminate) { | |||
4029 | StringRef Label; | |||
4030 | switch (Type) { | |||
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; | |||
4035 | } | |||
4036 | ||||
4037 | bool NonFragile = ForceNonFragileABI || isNonFragileABI(); | |||
4038 | ||||
4039 | StringRef Section; | |||
4040 | switch (Type) { | |||
4041 | case ObjCLabelType::ClassName: | |||
4042 | Section = NonFragile ? "__TEXT,__objc_classname,cstring_literals" | |||
4043 | : "__TEXT,__cstring,cstring_literals"; | |||
4044 | break; | |||
4045 | case ObjCLabelType::MethodVarName: | |||
4046 | Section = NonFragile ? "__TEXT,__objc_methname,cstring_literals" | |||
4047 | : "__TEXT,__cstring,cstring_literals"; | |||
4048 | break; | |||
4049 | case ObjCLabelType::MethodVarType: | |||
4050 | Section = NonFragile ? "__TEXT,__objc_methtype,cstring_literals" | |||
4051 | : "__TEXT,__cstring,cstring_literals"; | |||
4052 | break; | |||
4053 | case ObjCLabelType::PropertyName: | |||
4054 | Section = "__TEXT,__cstring,cstring_literals"; | |||
4055 | break; | |||
4056 | } | |||
4057 | ||||
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); | |||
4069 | ||||
4070 | return GV; | |||
4071 | } | |||
4072 | ||||
4073 | llvm::Function *CGObjCMac::ModuleInitFunction() { | |||
4074 | // Abuse this interface function as a place to finalize. | |||
4075 | FinishModule(); | |||
4076 | return nullptr; | |||
4077 | } | |||
4078 | ||||
4079 | llvm::FunctionCallee CGObjCMac::GetPropertyGetFunction() { | |||
4080 | return ObjCTypes.getGetPropertyFn(); | |||
4081 | } | |||
4082 | ||||
4083 | llvm::FunctionCallee CGObjCMac::GetPropertySetFunction() { | |||
4084 | return ObjCTypes.getSetPropertyFn(); | |||
4085 | } | |||
4086 | ||||
4087 | llvm::FunctionCallee CGObjCMac::GetOptimizedPropertySetFunction(bool atomic, | |||
4088 | bool copy) { | |||
4089 | return ObjCTypes.getOptimizedSetPropertyFn(atomic, copy); | |||
4090 | } | |||
4091 | ||||
4092 | llvm::FunctionCallee CGObjCMac::GetGetStructFunction() { | |||
4093 | return ObjCTypes.getCopyStructFn(); | |||
4094 | } | |||
4095 | ||||
4096 | llvm::FunctionCallee CGObjCMac::GetSetStructFunction() { | |||
4097 | return ObjCTypes.getCopyStructFn(); | |||
4098 | } | |||
4099 | ||||
4100 | llvm::FunctionCallee CGObjCMac::GetCppAtomicObjectGetFunction() { | |||
4101 | return ObjCTypes.getCppAtomicObjectFunction(); | |||
4102 | } | |||
4103 | ||||
4104 | llvm::FunctionCallee CGObjCMac::GetCppAtomicObjectSetFunction() { | |||
4105 | return ObjCTypes.getCppAtomicObjectFunction(); | |||
4106 | } | |||
4107 | ||||
4108 | llvm::FunctionCallee CGObjCMac::EnumerationMutationFunction() { | |||
4109 | return ObjCTypes.getEnumerationMutationFn(); | |||
4110 | } | |||
4111 | ||||
4112 | void CGObjCMac::EmitTryStmt(CodeGenFunction &CGF, const ObjCAtTryStmt &S) { | |||
4113 | return EmitTryOrSynchronizedStmt(CGF, S); | |||
4114 | } | |||
4115 | ||||
4116 | void CGObjCMac::EmitSynchronizedStmt(CodeGenFunction &CGF, | |||
4117 | const ObjCAtSynchronizedStmt &S) { | |||
4118 | return EmitTryOrSynchronizedStmt(CGF, S); | |||
4119 | } | |||
4120 | ||||
4121 | namespace { | |||
4122 | struct PerformFragileFinally final : EHScopeStack::Cleanup { | |||
4123 | const Stmt &S; | |||
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) {} | |||
4135 | ||||
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); | |||
4145 | ||||
4146 | CGF.EmitBlock(FinallyCallExit); | |||
4147 | CGF.EmitNounwindRuntimeCall(ObjCTypes.getExceptionTryExitFn(), | |||
4148 | ExceptionData.getPointer()); | |||
4149 | ||||
4150 | CGF.EmitBlock(FinallyNoCallExit); | |||
4151 | ||||
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; | |||
4157 | ||||
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()); | |||
4162 | ||||
4163 | CGF.EmitStmt(FinallyStmt->getFinallyBody()); | |||
4164 | ||||
4165 | if (CGF.HaveInsertPoint()) { | |||
4166 | CGF.Builder.CreateStore(CurCleanupDest, | |||
4167 | CGF.getNormalCleanupDestSlot()); | |||
4168 | } else { | |||
4169 | // Currently, the end of the cleanup must always exist. | |||
4170 | CGF.EnsureInsertPoint(); | |||
4171 | } | |||
4172 | } | |||
4173 | } else { | |||
4174 | // Emit objc_sync_exit(expr); as finally's sole statement for | |||
4175 | // @synchronized. | |||
4176 | llvm::Value *SyncArg = CGF.Builder.CreateLoad(SyncArgSlot); | |||
4177 | CGF.EmitNounwindRuntimeCall(ObjCTypes.getSyncExitFn(), SyncArg); | |||
4178 | } | |||
4179 | } | |||
4180 | }; | |||
4181 | ||||
4182 | class FragileHazards { | |||
4183 | CodeGenFunction &CGF; | |||
4184 | SmallVector<llvm::Value*, 20> Locals; | |||
4185 | llvm::DenseSet<llvm::BasicBlock*> BlocksBeforeTry; | |||
4186 | ||||
4187 | llvm::InlineAsm *ReadHazard; | |||
4188 | llvm::InlineAsm *WriteHazard; | |||
4189 | ||||
4190 | llvm::FunctionType *GetAsmFnType(); | |||
4191 | ||||
4192 | void collectLocals(); | |||
4193 | void emitReadHazard(CGBuilderTy &Builder); | |||
4194 | ||||
4195 | public: | |||
4196 | FragileHazards(CodeGenFunction &CGF); | |||
4197 | ||||
4198 | void emitWriteHazard(); | |||
4199 | void emitHazardsInNewBlocks(); | |||
4200 | }; | |||
4201 | } // end anonymous namespace | |||
4202 | ||||
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) { | |||
4209 | collectLocals(); | |||
4210 | ||||
4211 | if (Locals.empty()) return; | |||
4212 | ||||
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); | |||
4217 | ||||
4218 | llvm::FunctionType *AsmFnTy = GetAsmFnType(); | |||
4219 | ||||
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. | |||
4225 | { | |||
4226 | std::string Constraint; | |||
4227 | for (unsigned I = 0, E = Locals.size(); I != E; ++I) { | |||
4228 | if (I) Constraint += ','; | |||
4229 | Constraint += "*m"; | |||
4230 | } | |||
4231 | ||||
4232 | ReadHazard = llvm::InlineAsm::get(AsmFnTy, "", Constraint, true, false); | |||
4233 | } | |||
4234 | ||||
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. | |||
4239 | { | |||
4240 | std::string Constraint; | |||
4241 | for (unsigned I = 0, E = Locals.size(); I != E; ++I) { | |||
4242 | if (I) Constraint += ','; | |||
4243 | Constraint += "=*m"; | |||
4244 | } | |||
4245 | ||||
4246 | WriteHazard = llvm::InlineAsm::get(AsmFnTy, "", Constraint, true, false); | |||
4247 | } | |||
4248 | } | |||
4249 | ||||
4250 | /// Emit a write hazard at the current location. | |||
4251 | void FragileHazards::emitWriteHazard() { | |||
4252 | if (Locals.empty()) return; | |||
4253 | ||||
4254 | CGF.EmitNounwindRuntimeCall(WriteHazard, Locals); | |||
4255 | } | |||
4256 | ||||
4257 | void FragileHazards::emitReadHazard(CGBuilderTy &Builder) { | |||
4258 | assert(!Locals.empty())((!Locals.empty()) ? static_cast<void> (0) : __assert_fail ("!Locals.empty()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 4258, __PRETTY_FUNCTION__)); | |||
4259 | llvm::CallInst *call = Builder.CreateCall(ReadHazard, Locals); | |||
4260 | call->setDoesNotThrow(); | |||
4261 | call->setCallingConv(CGF.getRuntimeCC()); | |||
4262 | } | |||
4263 | ||||
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; | |||
4268 | ||||
4269 | CGBuilderTy Builder(CGF, CGF.getLLVMContext()); | |||
4270 | ||||
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; | |||
4276 | ||||
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; | |||
4281 | ||||
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)) | |||
4285 | continue; | |||
4286 | if (isa<llvm::IntrinsicInst>(I)) | |||
4287 | continue; | |||
4288 | ||||
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()) | |||
4292 | continue; | |||
4293 | ||||
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 | |||
4298 | // locals. | |||
4299 | Builder.SetInsertPoint(&BB, BI); | |||
4300 | emitReadHazard(Builder); | |||
4301 | } | |||
4302 | } | |||
4303 | } | |||
4304 | ||||
4305 | static void addIfPresent(llvm::DenseSet<llvm::Value*> &S, Address V) { | |||
4306 | if (V.isValid()) S.insert(V.getPointer()); | |||
4307 | } | |||
4308 | ||||
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); | |||
4314 | ||||
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); | |||
4322 | } | |||
4323 | ||||
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); | |||
4329 | } | |||
4330 | ||||
4331 | /* | |||
4332 | ||||
4333 | Objective-C setjmp-longjmp (sjlj) Exception Handling | |||
4334 | -- | |||
4335 | ||||
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. | |||
4342 | ||||
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 | |||
4351 | catch buffer. | |||
4352 | ||||
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 | |||
4357 | fragile ABI. | |||
4358 | ||||
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 | |||
4367 | ||||
4368 | The basic framework for a @try-catch-finally is as follows: | |||
4369 | { | |||
4370 | objc_exception_data d; | |||
4371 | id _rethrow = null; | |||
4372 | bool _call_try_exit = true; | |||
4373 | ||||
4374 | objc_exception_try_enter(&d); | |||
4375 | if (!setjmp(d.jmp_buf)) { | |||
4376 | ... try body ... | |||
4377 | } else { | |||
4378 | // exception path | |||
4379 | id _caught = objc_exception_extract(&d); | |||
4380 | ||||
4381 | // enter new try scope for handlers | |||
4382 | if (!setjmp(d.jmp_buf)) { | |||
4383 | ... match exception and execute catch blocks ... | |||
4384 | ||||
4385 | // fell off end, rethrow. | |||
4386 | _rethrow = _caught; | |||
4387 | ... jump-through-finally to finally_rethrow ... | |||
4388 | } else { | |||
4389 | // exception in catch block | |||
4390 | _rethrow = objc_exception_extract(&d); | |||
4391 | _call_try_exit = false; | |||
4392 | ... jump-through-finally to finally_rethrow ... | |||
4393 | } | |||
4394 | } | |||
4395 | ... jump-through-finally to finally_end ... | |||
4396 | ||||
4397 | finally: | |||
4398 | if (_call_try_exit) | |||
4399 | objc_exception_try_exit(&d); | |||
4400 | ||||
4401 | ... finally block .... | |||
4402 | ... dispatch to finally destination ... | |||
4403 | ||||
4404 | finally_rethrow: | |||
4405 | objc_exception_throw(_rethrow); | |||
4406 | ||||
4407 | finally_end: | |||
4408 | } | |||
4409 | ||||
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. | |||
4414 | ||||
4415 | We specialize this framework for a few particular circumstances: | |||
4416 | ||||
4417 | - If there are no catch blocks, then we avoid emitting the second | |||
4418 | exception handling context. | |||
4419 | ||||
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. | |||
4422 | ||||
4423 | - FIXME: If there is no @finally block we can do a few more | |||
4424 | simplifications. | |||
4425 | ||||
4426 | Rethrows and Jumps-Through-Finally | |||
4427 | -- | |||
4428 | ||||
4429 | '@throw;' is supported by pushing the currently-caught exception | |||
4430 | onto ObjCEHStack while the @catch blocks are emitted. | |||
4431 | ||||
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. | |||
4436 | ||||
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); } | |||
4441 | */ | |||
4442 | ||||
4443 | void CGObjCMac::EmitTryOrSynchronizedStmt(CodeGen::CodeGenFunction &CGF, | |||
4444 | const Stmt &S) { | |||
4445 | bool isTry = isa<ObjCAtTryStmt>(S); | |||
4446 | ||||
4447 | // A destination for the fall-through edges of the catch handlers to | |||
4448 | // jump to. | |||
4449 | CodeGenFunction::JumpDest FinallyEnd = | |||
4450 | CGF.getJumpDestInCurrentScope("finally.end"); | |||
4451 | ||||
4452 | // A destination for the rethrow edge of the catch handlers to jump | |||
4453 | // to. | |||
4454 | CodeGenFunction::JumpDest FinallyRethrow = | |||
4455 | CGF.getJumpDestInCurrentScope("finally.rethrow"); | |||
4456 | ||||
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(); | |||
4463 | if (!isTry) { | |||
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); | |||
4468 | ||||
4469 | SyncArgSlot = CGF.CreateTempAlloca(SyncArg->getType(), | |||
4470 | CGF.getPointerAlign(), "sync.arg"); | |||
4471 | CGF.Builder.CreateStore(SyncArg, SyncArgSlot); | |||
4472 | } | |||
4473 | ||||
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"); | |||
4479 | ||||
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); | |||
4485 | ||||
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(), | |||
4495 | CharUnits::One(), | |||
4496 | "_call_try_exit"); | |||
4497 | ||||
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(); | |||
4501 | ||||
4502 | // Push a normal cleanup to leave the try scope. | |||
4503 | CGF.EHStack.pushCleanup<PerformFragileFinally>(NormalAndEHCleanup, &S, | |||
4504 | SyncArgSlot, | |||
4505 | CallTryExitVar, | |||
4506 | ExceptionData, | |||
4507 | &ObjCTypes); | |||
4508 | ||||
4509 | // Enter a try block: | |||
4510 | // - Call objc_exception_try_enter to push ExceptionData on top of | |||
4511 | // the EH stack. | |||
4512 | CGF.EmitNounwindRuntimeCall(ObjCTypes.getExceptionTryEnterFn(), | |||
4513 | ExceptionData.getPointer()); | |||
4514 | ||||
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, | |||
4520 | "setjmp_buffer"); | |||
4521 | llvm::CallInst *SetJmpResult = CGF.EmitNounwindRuntimeCall( | |||
4522 | ObjCTypes.getSetJmpFn(), SetJmpBuffer, "setjmp_result"); | |||
4523 | SetJmpResult->setCanReturnTwice(); | |||
4524 | ||||
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); | |||
4532 | ||||
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()); | |||
4538 | ||||
4539 | CGBuilderTy::InsertPoint TryFallthroughIP = CGF.Builder.saveAndClearIP(); | |||
4540 | ||||
4541 | // Emit the exception handler block. | |||
4542 | CGF.EmitBlock(TryHandler); | |||
4543 | ||||
4544 | // Don't optimize loads of the in-scope locals across this point. | |||
4545 | Hazards.emitWriteHazard(); | |||
4546 | ||||
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); | |||
4553 | ||||
4554 | // Otherwise, we have to match against the caught exceptions. | |||
4555 | } else { | |||
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"); | |||
4561 | ||||
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); | |||
4565 | ||||
4566 | const ObjCAtTryStmt* AtTryStmt = cast<ObjCAtTryStmt>(&S); | |||
4567 | ||||
4568 | bool HasFinally = (AtTryStmt->getFinallyStmt() != nullptr); | |||
4569 | ||||
4570 | llvm::BasicBlock *CatchBlock = nullptr; | |||
4571 | llvm::BasicBlock *CatchHandler = nullptr; | |||
4572 | if (HasFinally) { | |||
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); | |||
4579 | ||||
4580 | // Enter a new exception try block (in case a @catch block | |||
4581 | // throws an exception). | |||
4582 | CGF.EmitNounwindRuntimeCall(ObjCTypes.getExceptionTryEnterFn(), | |||
4583 | ExceptionData.getPointer()); | |||
4584 | ||||
4585 | llvm::CallInst *SetJmpResult = | |||
4586 | CGF.EmitNounwindRuntimeCall(ObjCTypes.getSetJmpFn(), | |||
4587 | SetJmpBuffer, "setjmp.result"); | |||
4588 | SetJmpResult->setCanReturnTwice(); | |||
4589 | ||||
4590 | llvm::Value *Threw = | |||
4591 | CGF.Builder.CreateIsNotNull(SetJmpResult, "did_catch_exception"); | |||
4592 | ||||
4593 | CatchBlock = CGF.createBasicBlock("catch"); | |||
4594 | CatchHandler = CGF.createBasicBlock("catch_for_catch"); | |||
4595 | CGF.Builder.CreateCondBr(Threw, CatchHandler, CatchBlock); | |||
4596 | ||||
4597 | CGF.EmitBlock(CatchBlock); | |||
4598 | } | |||
4599 | ||||
4600 | CGF.Builder.CreateStore(CGF.Builder.getInt1(HasFinally), CallTryExitVar); | |||
4601 | ||||
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 | |||
4604 | // so. | |||
4605 | bool AllMatched = false; | |||
4606 | for (unsigned I = 0, N = AtTryStmt->getNumCatchStmts(); I != N; ++I) { | |||
4607 | const ObjCAtCatchStmt *CatchStmt = AtTryStmt->getCatchStmt(I); | |||
4608 | ||||
4609 | const VarDecl *CatchParam = CatchStmt->getCatchParamDecl(); | |||
4610 | const ObjCObjectPointerType *OPT = nullptr; | |||
4611 | ||||
4612 | // catch(...) always matches. | |||
4613 | if (!CatchParam) { | |||
4614 | AllMatched = true; | |||
4615 | } else { | |||
4616 | OPT = CatchParam->getType()->getAs<ObjCObjectPointerType>(); | |||
4617 | ||||
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())) | |||
4623 | AllMatched = true; | |||
4624 | } | |||
4625 | ||||
4626 | // If this is a catch-all, we don't need to test anything. | |||
4627 | if (AllMatched) { | |||
4628 | CodeGenFunction::RunCleanupsScope CatchVarCleanups(CGF); | |||
4629 | ||||
4630 | if (CatchParam) { | |||
4631 | CGF.EmitAutoVarDecl(*CatchParam); | |||
4632 | assert(CGF.HaveInsertPoint() && "DeclStmt destroyed insert point?")((CGF.HaveInsertPoint() && "DeclStmt destroyed insert point?" ) ? static_cast<void> (0) : __assert_fail ("CGF.HaveInsertPoint() && \"DeclStmt destroyed insert point?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 4632, __PRETTY_FUNCTION__)); | |||
4633 | ||||
4634 | // These types work out because ConvertType(id) == i8*. | |||
4635 | EmitInitOfCatchParam(CGF, Caught, CatchParam); | |||
4636 | } | |||
4637 | ||||
4638 | CGF.EmitStmt(CatchStmt->getCatchBody()); | |||
4639 | ||||
4640 | // The scope of the catch variable ends right here. | |||
4641 | CatchVarCleanups.ForceCleanup(); | |||
4642 | ||||
4643 | CGF.EmitBranchThroughCleanup(FinallyEnd); | |||
4644 | break; | |||
4645 | } | |||
4646 | ||||
4647 | assert(OPT && "Unexpected non-object pointer type in @catch")((OPT && "Unexpected non-object pointer type in @catch" ) ? static_cast<void> (0) : __assert_fail ("OPT && \"Unexpected non-object pointer type in @catch\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 4647, __PRETTY_FUNCTION__)); | |||
4648 | const ObjCObjectType *ObjTy = OPT->getObjectType(); | |||
4649 | ||||
4650 | // FIXME: @catch (Class c) ? | |||
4651 | ObjCInterfaceDecl *IDecl = ObjTy->getInterface(); | |||
4652 | assert(IDecl && "Catch parameter must have Objective-C type!")((IDecl && "Catch parameter must have Objective-C type!" ) ? static_cast<void> (0) : __assert_fail ("IDecl && \"Catch parameter must have Objective-C type!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 4652, __PRETTY_FUNCTION__)); | |||
4653 | ||||
4654 | // Check if the @catch block matches the exception object. | |||
4655 | llvm::Value *Class = EmitClassRef(CGF, IDecl); | |||
4656 | ||||
4657 | llvm::Value *matchArgs[] = { Class, Caught }; | |||
4658 | llvm::CallInst *Match = | |||
4659 | CGF.EmitNounwindRuntimeCall(ObjCTypes.getExceptionMatchFn(), | |||
4660 | matchArgs, "match"); | |||
4661 | ||||
4662 | llvm::BasicBlock *MatchedBlock = CGF.createBasicBlock("match"); | |||
4663 | llvm::BasicBlock *NextCatchBlock = CGF.createBasicBlock("catch.next"); | |||
4664 | ||||
4665 | CGF.Builder.CreateCondBr(CGF.Builder.CreateIsNotNull(Match, "matched"), | |||
4666 | MatchedBlock, NextCatchBlock); | |||
4667 | ||||
4668 | // Emit the @catch block. | |||
4669 | CGF.EmitBlock(MatchedBlock); | |||
4670 | ||||
4671 | // Collect any cleanups for the catch variable. The scope lasts until | |||
4672 | // the end of the catch body. | |||
4673 | CodeGenFunction::RunCleanupsScope CatchVarCleanups(CGF); | |||
4674 | ||||
4675 | CGF.EmitAutoVarDecl(*CatchParam); | |||
4676 | assert(CGF.HaveInsertPoint() && "DeclStmt destroyed insert point?")((CGF.HaveInsertPoint() && "DeclStmt destroyed insert point?" ) ? static_cast<void> (0) : __assert_fail ("CGF.HaveInsertPoint() && \"DeclStmt destroyed insert point?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 4676, __PRETTY_FUNCTION__)); | |||
4677 | ||||
4678 | // Initialize the catch variable. | |||
4679 | llvm::Value *Tmp = | |||
4680 | CGF.Builder.CreateBitCast(Caught, | |||
4681 | CGF.ConvertType(CatchParam->getType())); | |||
4682 | EmitInitOfCatchParam(CGF, Tmp, CatchParam); | |||
4683 | ||||
4684 | CGF.EmitStmt(CatchStmt->getCatchBody()); | |||
4685 | ||||
4686 | // We're done with the catch variable. | |||
4687 | CatchVarCleanups.ForceCleanup(); | |||
4688 | ||||
4689 | CGF.EmitBranchThroughCleanup(FinallyEnd); | |||
4690 | ||||
4691 | CGF.EmitBlock(NextCatchBlock); | |||
4692 | } | |||
4693 | ||||
4694 | CGF.ObjCEHValueStack.pop_back(); | |||
4695 | ||||
4696 | // If nothing wanted anything to do with the caught exception, | |||
4697 | // kill the extract call. | |||
4698 | if (Caught->use_empty()) | |||
4699 | Caught->eraseFromParent(); | |||
4700 | ||||
4701 | if (!AllMatched) | |||
4702 | CGF.EmitBranchThroughCleanup(FinallyRethrow); | |||
4703 | ||||
4704 | if (HasFinally) { | |||
4705 | // Emit the exception handler for the @catch blocks. | |||
4706 | CGF.EmitBlock(CatchHandler); | |||
4707 | ||||
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(); | |||
4712 | ||||
4713 | // Extract the new exception and save it to the | |||
4714 | // propagating-exception slot. | |||
4715 | assert(PropagatingExnVar.isValid())((PropagatingExnVar.isValid()) ? static_cast<void> (0) : __assert_fail ("PropagatingExnVar.isValid()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 4715, __PRETTY_FUNCTION__)); | |||
4716 | llvm::CallInst *NewCaught = | |||
4717 | CGF.EmitNounwindRuntimeCall(ObjCTypes.getExceptionExtractFn(), | |||
4718 | ExceptionData.getPointer(), "caught"); | |||
4719 | CGF.Builder.CreateStore(NewCaught, PropagatingExnVar); | |||
4720 | ||||
4721 | // Don't pop the catch handler; the throw already did. | |||
4722 | CGF.Builder.CreateStore(CGF.Builder.getFalse(), CallTryExitVar); | |||
4723 | CGF.EmitBranchThroughCleanup(FinallyRethrow); | |||
4724 | } | |||
4725 | } | |||
4726 | ||||
4727 | // Insert read hazards as required in the new blocks. | |||
4728 | Hazards.emitHazardsInNewBlocks(); | |||
4729 | ||||
4730 | // Pop the cleanup. | |||
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); | |||
4736 | ||||
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); | |||
4745 | ||||
4746 | // Otherwise, just look in the buffer for the exception to throw. | |||
4747 | } else { | |||
4748 | llvm::CallInst *Caught = | |||
4749 | CGF.EmitNounwindRuntimeCall(ObjCTypes.getExceptionExtractFn(), | |||
4750 | ExceptionData.getPointer()); | |||
4751 | PropagatingExn = Caught; | |||
4752 | } | |||
4753 | ||||
4754 | CGF.EmitNounwindRuntimeCall(ObjCTypes.getExceptionThrowFn(), | |||
4755 | PropagatingExn); | |||
4756 | CGF.Builder.CreateUnreachable(); | |||
4757 | } | |||
4758 | ||||
4759 | CGF.Builder.restoreIP(SavedIP); | |||
4760 | } | |||
4761 | ||||
4762 | void CGObjCMac::EmitThrowStmt(CodeGen::CodeGenFunction &CGF, | |||
4763 | const ObjCAtThrowStmt &S, | |||
4764 | bool ClearInsertionPoint) { | |||
4765 | llvm::Value *ExceptionAsObject; | |||
4766 | ||||
4767 | if (const Expr *ThrowExpr = S.getThrowExpr()) { | |||
4768 | llvm::Value *Exception = CGF.EmitObjCThrowOperand(ThrowExpr); | |||
4769 | ExceptionAsObject = | |||
4770 | CGF.Builder.CreateBitCast(Exception, ObjCTypes.ObjectPtrTy); | |||
4771 | } else { | |||
4772 | assert((!CGF.ObjCEHValueStack.empty() && CGF.ObjCEHValueStack.back()) &&(((!CGF.ObjCEHValueStack.empty() && CGF.ObjCEHValueStack .back()) && "Unexpected rethrow outside @catch block." ) ? static_cast<void> (0) : __assert_fail ("(!CGF.ObjCEHValueStack.empty() && CGF.ObjCEHValueStack.back()) && \"Unexpected rethrow outside @catch block.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 4773, __PRETTY_FUNCTION__)) | |||
4773 | "Unexpected rethrow outside @catch block.")(((!CGF.ObjCEHValueStack.empty() && CGF.ObjCEHValueStack .back()) && "Unexpected rethrow outside @catch block." ) ? static_cast<void> (0) : __assert_fail ("(!CGF.ObjCEHValueStack.empty() && CGF.ObjCEHValueStack.back()) && \"Unexpected rethrow outside @catch block.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 4773, __PRETTY_FUNCTION__)); | |||
4774 | ExceptionAsObject = CGF.ObjCEHValueStack.back(); | |||
4775 | } | |||
4776 | ||||
4777 | CGF.EmitRuntimeCall(ObjCTypes.getExceptionThrowFn(), ExceptionAsObject) | |||
4778 | ->setDoesNotReturn(); | |||
4779 | CGF.Builder.CreateUnreachable(); | |||
4780 | ||||
4781 | // Clear the insertion point to indicate we are in unreachable code. | |||
4782 | if (ClearInsertionPoint) | |||
4783 | CGF.Builder.ClearInsertionPoint(); | |||
4784 | } | |||
4785 | ||||
4786 | /// EmitObjCWeakRead - Code gen for loading value of a __weak | |||
4787 | /// object: objc_read_weak (id *src) | |||
4788 | /// | |||
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); | |||
4798 | return read_weak; | |||
4799 | } | |||
4800 | ||||
4801 | /// EmitObjCWeakAssign - Code gen for assigning to a __weak object. | |||
4802 | /// objc_assign_weak (id src, id *dst) | |||
4803 | /// | |||
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")((Size <= 8 && "does not support size > 8") ? static_cast <void> (0) : __assert_fail ("Size <= 8 && \"does not support size > 8\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 4809, __PRETTY_FUNCTION__)); | |||
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); | |||
4813 | } | |||
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"); | |||
4819 | } | |||
4820 | ||||
4821 | /// EmitObjCGlobalAssign - Code gen for assigning to a __strong object. | |||
4822 | /// objc_assign_global (id src, id *dst) | |||
4823 | /// | |||
4824 | void CGObjCMac::EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF, | |||
4825 | llvm::Value *src, Address dst, | |||
4826 | bool threadlocal) { | |||
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")((Size <= 8 && "does not support size > 8") ? static_cast <void> (0) : __assert_fail ("Size <= 8 && \"does not support size > 8\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 4830, __PRETTY_FUNCTION__)); | |||
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); | |||
4834 | } | |||
4835 | src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy); | |||
4836 | dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy); | |||
4837 | llvm::Value *args[] = { src, dst.getPointer() }; | |||
4838 | if (!threadlocal) | |||
4839 | CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignGlobalFn(), | |||
4840 | args, "globalassign"); | |||
4841 | else | |||
4842 | CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignThreadLocalFn(), | |||
4843 | args, "threadlocalassign"); | |||
4844 | } | |||
4845 | ||||
4846 | /// EmitObjCIvarAssign - Code gen for assigning to a __strong object. | |||
4847 | /// objc_assign_ivar (id src, id *dst, ptrdiff_t ivaroffset) | |||
4848 | /// | |||
4849 | void CGObjCMac::EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF, | |||
4850 | llvm::Value *src, Address dst, | |||
4851 | llvm::Value *ivarOffset) { | |||
4852 | assert(ivarOffset && "EmitObjCIvarAssign - ivarOffset is NULL")((ivarOffset && "EmitObjCIvarAssign - ivarOffset is NULL" ) ? static_cast<void> (0) : __assert_fail ("ivarOffset && \"EmitObjCIvarAssign - ivarOffset is NULL\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 4852, __PRETTY_FUNCTION__)); | |||
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")((Size <= 8 && "does not support size > 8") ? static_cast <void> (0) : __assert_fail ("Size <= 8 && \"does not support size > 8\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 4856, __PRETTY_FUNCTION__)); | |||
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); | |||
4860 | } | |||
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); | |||
4865 | } | |||
4866 | ||||
4867 | /// EmitObjCStrongCastAssign - Code gen for assigning to a __strong cast object. | |||
4868 | /// objc_assign_strongCast (id src, id *dst) | |||
4869 | /// | |||
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")((Size <= 8 && "does not support size > 8") ? static_cast <void> (0) : __assert_fail ("Size <= 8 && \"does not support size > 8\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 4875, __PRETTY_FUNCTION__)); | |||
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); | |||
4879 | } | |||
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"); | |||
4885 | } | |||
4886 | ||||
4887 | void CGObjCMac::EmitGCMemmoveCollectable(CodeGen::CodeGenFunction &CGF, | |||
4888 | Address DestPtr, | |||
4889 | Address SrcPtr, | |||
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); | |||
4895 | } | |||
4896 | ||||
4897 | /// EmitObjCValueForIvar - Code Gen for ivar reference. | |||
4898 | /// | |||
4899 | LValue CGObjCMac::EmitObjCValueForIvar(CodeGen::CodeGenFunction &CGF, | |||
4900 | QualType ObjectTy, | |||
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)); | |||
4908 | } | |||
4909 | ||||
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), | |||
4916 | Offset); | |||
4917 | } | |||
4918 | ||||
4919 | /* *** Private Interface *** */ | |||
4920 | ||||
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")::llvm::llvm_unreachable_internal("unexpected object file format" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 4925); | |||
4926 | case llvm::Triple::MachO: { | |||
4927 | if (MachOAttributes.empty()) | |||
4928 | return ("__DATA," + Section).str(); | |||
4929 | return ("__DATA," + Section + "," + MachOAttributes).str(); | |||
4930 | } | |||
4931 | case llvm::Triple::ELF: | |||
4932 | assert(Section.substr(0, 2) == "__" &&((Section.substr(0, 2) == "__" && "expected the name to begin with __" ) ? static_cast<void> (0) : __assert_fail ("Section.substr(0, 2) == \"__\" && \"expected the name to begin with __\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 4933, __PRETTY_FUNCTION__)) | |||
4933 | "expected the name to begin with __")((Section.substr(0, 2) == "__" && "expected the name to begin with __" ) ? static_cast<void> (0) : __assert_fail ("Section.substr(0, 2) == \"__\" && \"expected the name to begin with __\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 4933, __PRETTY_FUNCTION__)); | |||
4934 | return Section.substr(2).str(); | |||
4935 | case llvm::Triple::COFF: | |||
4936 | assert(Section.substr(0, 2) == "__" &&((Section.substr(0, 2) == "__" && "expected the name to begin with __" ) ? static_cast<void> (0) : __assert_fail ("Section.substr(0, 2) == \"__\" && \"expected the name to begin with __\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 4937, __PRETTY_FUNCTION__)) | |||
4937 | "expected the name to begin with __")((Section.substr(0, 2) == "__" && "expected the name to begin with __" ) ? static_cast<void> (0) : __assert_fail ("Section.substr(0, 2) == \"__\" && \"expected the name to begin with __\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 4937, __PRETTY_FUNCTION__)); | |||
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."); | |||
4943 | } | |||
4944 | ||||
4945 | llvm_unreachable("Unhandled llvm::Triple::ObjectFormatType enum")::llvm::llvm_unreachable_internal("Unhandled llvm::Triple::ObjectFormatType enum" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 4945); | |||
4946 | } | |||
4947 | ||||
4948 | /// EmitImageInfo - Emit the image info marker used to encode some module | |||
4949 | /// level information. | |||
4950 | /// | |||
4951 | /// See: <rdr://4810609&4810587&4810587> | |||
4952 | /// struct IMAGE_INFO { | |||
4953 | /// unsigned version; | |||
4954 | /// unsigned flags; | |||
4955 | /// }; | |||
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. | |||
4961 | ||||
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) | |||
4967 | }; | |||
4968 | ||||
4969 | void CGObjCCommonMac::EmitImageInfo() { | |||
4970 | unsigned version = 0; // Version is unused? | |||
4971 | std::string Section = | |||
4972 | (ObjCABI == 1) | |||
4973 | ? "__OBJC,__image_info,regular" | |||
4974 | : GetSectionName("__objc_imageinfo", "regular,no_dead_strip"); | |||
4975 | ||||
4976 | // Generate module-level named metadata to convey this information to the | |||
4977 | // linker and code-gen. | |||
4978 | llvm::Module &Mod = CGM.getModule(); | |||
4979 | ||||
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", | |||
4983 | version); | |||
4984 | Mod.addModuleFlag(llvm::Module::Error, "Objective-C Image Info Section", | |||
4985 | llvm::MDString::get(VMContext, Section)); | |||
4986 | ||||
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); | |||
4991 | } else { | |||
4992 | // Add the ObjC garbage collection value. | |||
4993 | Mod.addModuleFlag(llvm::Module::Error, | |||
4994 | "Objective-C Garbage Collection", | |||
4995 | eImageInfo_GarbageCollected); | |||
4996 | ||||
4997 | if (CGM.getLangOpts().getGC() == LangOptions::GCOnly) { | |||
4998 | // Add the ObjC GC Only value. | |||
4999 | Mod.addModuleFlag(llvm::Module::Error, "Objective-C GC Only", | |||
5000 | eImageInfo_GCOnly); | |||
5001 | ||||
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)); | |||
5009 | } | |||
5010 | } | |||
5011 | ||||
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); | |||
5016 | ||||
5017 | // Indicate whether we are generating class properties. | |||
5018 | Mod.addModuleFlag(llvm::Module::Error, "Objective-C Class Properties", | |||
5019 | eImageInfo_ClassProperties); | |||
5020 | } | |||
5021 | ||||
5022 | // struct objc_module { | |||
5023 | // unsigned long version; | |||
5024 | // unsigned long size; | |||
5025 | // const char *name; | |||
5026 | // Symtab symtab; | |||
5027 | // }; | |||
5028 | ||||
5029 | // FIXME: Get from somewhere | |||
5030 | static const int ModuleVersion = 7; | |||
5031 | ||||
5032 | void CGObjCMac::EmitModuleInfo() { | |||
5033 | uint64_t Size = CGM.getDataLayout().getTypeAllocSize(ObjCTypes.ModuleTy); | |||
5034 | ||||
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); | |||
5045 | } | |||
5046 | ||||
5047 | llvm::Constant *CGObjCMac::EmitModuleSymbols() { | |||
5048 | unsigned NumClasses = DefinedClasses.size(); | |||
5049 | unsigned NumCategories = DefinedCategories.size(); | |||
5050 | ||||
5051 | // Return null if no symbols were defined. | |||
5052 | if (!NumClasses && !NumCategories) | |||
5053 | return llvm::Constant::getNullValue(ObjCTypes.SymtabPtrTy); | |||
5054 | ||||
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); | |||
5061 | ||||
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]; | |||
5067 | assert(ID)((ID) ? static_cast<void> (0) : __assert_fail ("ID", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 5067, __PRETTY_FUNCTION__)); | |||
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); | |||
5072 | ||||
5073 | array.addBitCast(DefinedClasses[i], ObjCTypes.Int8PtrTy); | |||
5074 | } | |||
5075 | for (unsigned i=0; i<NumCategories; i++) | |||
5076 | array.addBitCast(DefinedCategories[i], ObjCTypes.Int8PtrTy); | |||
5077 | ||||
5078 | array.finishAndAddTo(values); | |||
5079 | ||||
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); | |||
5084 | } | |||
5085 | ||||
5086 | llvm::Value *CGObjCMac::EmitClassRefFromId(CodeGenFunction &CGF, | |||
5087 | IdentifierInfo *II) { | |||
5088 | LazySymbols.insert(II); | |||
5089 | ||||
5090 | llvm::GlobalVariable *&Entry = ClassReferences[II]; | |||
5091 | ||||
5092 | if (!Entry) { | |||
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); | |||
5100 | } | |||
5101 | ||||
5102 | return CGF.Builder.CreateAlignedLoad(Entry, CGF.getPointerAlign()); | |||
5103 | } | |||
5104 | ||||
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); | |||
5111 | ||||
5112 | IdentifierInfo *RuntimeName = | |||
5113 | &CGM.getContext().Idents.get(ID->getObjCRuntimeNameAsString()); | |||
5114 | return EmitClassRefFromId(CGF, RuntimeName); | |||
5115 | } | |||
5116 | ||||
5117 | llvm::Value *CGObjCMac::EmitNSAutoreleasePoolClassRef(CodeGenFunction &CGF) { | |||
5118 | IdentifierInfo *II = &CGM.getContext().Idents.get("NSAutoreleasePool"); | |||
5119 | return EmitClassRefFromId(CGF, II); | |||
5120 | } | |||
5121 | ||||
5122 | llvm::Value *CGObjCMac::EmitSelector(CodeGenFunction &CGF, Selector Sel) { | |||
5123 | return CGF.Builder.CreateLoad(EmitSelectorAddr(CGF, Sel)); | |||
5124 | } | |||
5125 | ||||
5126 | Address CGObjCMac::EmitSelectorAddr(CodeGenFunction &CGF, Selector Sel) { | |||
5127 | CharUnits Align = CGF.getPointerAlign(); | |||
5128 | ||||
5129 | llvm::GlobalVariable *&Entry = SelectorReferences[Sel]; | |||
5130 | if (!Entry) { | |||
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); | |||
5138 | } | |||
5139 | ||||
5140 | return Address(Entry, Align); | |||
5141 | } | |||
5142 | ||||
5143 | llvm::Constant *CGObjCCommonMac::GetClassName(StringRef RuntimeName) { | |||
5144 | llvm::GlobalVariable *&Entry = ClassNames[RuntimeName]; | |||
5145 | if (!Entry) | |||
5146 | Entry = CreateCStringLiteral(RuntimeName, ObjCLabelType::ClassName); | |||
5147 | return getConstantGEP(VMContext, Entry, 0, 0); | |||
5148 | } | |||
5149 | ||||
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()) | |||
5154 | return I->second; | |||
5155 | ||||
5156 | return nullptr; | |||
5157 | } | |||
5158 | ||||
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); | |||
5164 | } | |||
5165 | ||||
5166 | void IvarLayoutBuilder::visitRecord(const RecordType *RT, | |||
5167 | CharUnits offset) { | |||
5168 | const RecordDecl *RD = RT->getDecl(); | |||
5169 | ||||
5170 | // If this is a union, remember that we had one, because it might mess | |||
5171 | // up the ordering of layout entries. | |||
5172 | if (RD->isUnion()) | |||
5173 | IsDisordered = true; | |||
5174 | ||||
5175 | const ASTRecordLayout *recLayout = nullptr; | |||
5176 | visitAggregate(RD->field_begin(), RD->field_end(), offset, | |||
5177 | [&](const FieldDecl *field) -> CharUnits { | |||
5178 | if (!recLayout) | |||
5179 | recLayout = &CGM.getContext().getASTRecordLayout(RD); | |||
5180 | auto offsetInBits = recLayout->getFieldOffset(field->getFieldIndex()); | |||
5181 | return CGM.getContext().toCharUnitsFromBits(offsetInBits); | |||
5182 | }); | |||
5183 | } | |||
5184 | ||||
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; | |||
5191 | ||||
5192 | // Skip over bitfields. | |||
5193 | if (field->isBitField()) { | |||
5194 | continue; | |||
5195 | } | |||
5196 | ||||
5197 | // Compute the offset of the field within the aggregate. | |||
5198 | CharUnits fieldOffset = aggregateOffset + getOffset(field); | |||
5199 | ||||
5200 | visitField(field, fieldOffset); | |||
5201 | } | |||
5202 | } | |||
5203 | ||||
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(); | |||
5208 | ||||
5209 | // Drill down into arrays. | |||
5210 | uint64_t numElts = 1; | |||
5211 | if (auto arrayType = CGM.getContext().getAsIncompleteArrayType(fieldType)) { | |||
5212 | numElts = 0; | |||
5213 | fieldType = arrayType->getElementType(); | |||
5214 | } | |||
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(); | |||
5219 | } | |||
5220 | ||||
5221 | assert(!fieldType->isArrayType() && "ivar of non-constant array type?")((!fieldType->isArrayType() && "ivar of non-constant array type?" ) ? static_cast<void> (0) : __assert_fail ("!fieldType->isArrayType() && \"ivar of non-constant array type?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 5221, __PRETTY_FUNCTION__)); | |||
5222 | ||||
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; | |||
5226 | ||||
5227 | // Recurse if the base element type is a record type. | |||
5228 | if (auto recType = fieldType->getAs<RecordType>()) { | |||
5229 | size_t oldEnd = IvarsInfo.size(); | |||
5230 | ||||
5231 | visitRecord(recType, fieldOffset); | |||
5232 | ||||
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)); | |||
5244 | } | |||
5245 | } | |||
5246 | } | |||
5247 | ||||
5248 | return; | |||
5249 | } | |||
5250 | ||||
5251 | // Classify the element type. | |||
5252 | Qualifiers::GC GCAttr = GetGCAttrTypeForType(CGM.getContext(), fieldType); | |||
5253 | ||||
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)((CGM.getContext().getTypeSizeInChars(fieldType) == CGM.getPointerSize ()) ? static_cast<void> (0) : __assert_fail ("CGM.getContext().getTypeSizeInChars(fieldType) == CGM.getPointerSize()" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 5258, __PRETTY_FUNCTION__)) | |||
5258 | == CGM.getPointerSize())((CGM.getContext().getTypeSizeInChars(fieldType) == CGM.getPointerSize ()) ? static_cast<void> (0) : __assert_fail ("CGM.getContext().getTypeSizeInChars(fieldType) == CGM.getPointerSize()" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 5258, __PRETTY_FUNCTION__)); | |||
5259 | IvarsInfo.push_back(IvarInfo(fieldOffset, numElts)); | |||
5260 | } | |||
5261 | } | |||
5262 | ||||
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; | |||
5273 | ||||
5274 | assert(!IvarsInfo.empty() && "generating bitmap for no data")((!IvarsInfo.empty() && "generating bitmap for no data" ) ? static_cast<void> (0) : __assert_fail ("!IvarsInfo.empty() && \"generating bitmap for no data\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 5274, __PRETTY_FUNCTION__)); | |||
5275 | ||||
5276 | // Sort the ivar info on byte position in case we encounterred a | |||
5277 | // union nested in the ivar list. | |||
5278 | if (IsDisordered) { | |||
5279 | // This isn't a stable sort, but our algorithm should handle it fine. | |||
5280 | llvm::array_pod_sort(IvarsInfo.begin(), IvarsInfo.end()); | |||
5281 | } else { | |||
5282 | assert(std::is_sorted(IvarsInfo.begin(), IvarsInfo.end()))((std::is_sorted(IvarsInfo.begin(), IvarsInfo.end())) ? static_cast <void> (0) : __assert_fail ("std::is_sorted(IvarsInfo.begin(), IvarsInfo.end())" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 5282, __PRETTY_FUNCTION__)); | |||
5283 | } | |||
5284 | assert(IvarsInfo.back().Offset < InstanceEnd)((IvarsInfo.back().Offset < InstanceEnd) ? static_cast< void> (0) : __assert_fail ("IvarsInfo.back().Offset < InstanceEnd" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 5284, __PRETTY_FUNCTION__)); | |||
5285 | ||||
5286 | assert(buffer.empty())((buffer.empty()) ? static_cast<void> (0) : __assert_fail ("buffer.empty()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 5286, __PRETTY_FUNCTION__)); | |||
5287 | ||||
5288 | // Skip the next N words. | |||
5289 | auto skip = [&](unsigned numWords) { | |||
5290 | assert(numWords > 0)((numWords > 0) ? static_cast<void> (0) : __assert_fail ("numWords > 0", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 5290, __PRETTY_FUNCTION__)); | |||
5291 | ||||
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); | |||
5301 | } | |||
5302 | } | |||
5303 | ||||
5304 | while (numWords >= MaxNibble) { | |||
5305 | buffer.push_back(MaxNibble << SkipShift); | |||
5306 | numWords -= MaxNibble; | |||
5307 | } | |||
5308 | if (numWords) { | |||
5309 | buffer.push_back(numWords << SkipShift); | |||
5310 | } | |||
5311 | }; | |||
5312 | ||||
5313 | // Scan the next N words. | |||
5314 | auto scan = [&](unsigned numWords) { | |||
5315 | assert(numWords > 0)((numWords > 0) ? static_cast<void> (0) : __assert_fail ("numWords > 0", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 5315, __PRETTY_FUNCTION__)); | |||
5316 | ||||
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); | |||
5326 | } | |||
5327 | } | |||
5328 | ||||
5329 | while (numWords >= MaxNibble) { | |||
5330 | buffer.push_back(MaxNibble << ScanShift); | |||
5331 | numWords -= MaxNibble; | |||
5332 | } | |||
5333 | if (numWords) { | |||
5334 | buffer.push_back(numWords << ScanShift); | |||
5335 | } | |||
5336 | }; | |||
5337 | ||||
5338 | // One past the end of the last scan. | |||
5339 | unsigned endOfLastScanInWords = 0; | |||
5340 | const CharUnits WordSize = CGM.getPointerSize(); | |||
5341 | ||||
5342 | // Consider all the scan requests. | |||
5343 | for (auto &request : IvarsInfo) { | |||
5344 | CharUnits beginOfScan = request.Offset - InstanceBegin; | |||
5345 | ||||
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; | |||
5349 | ||||
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)((request.Offset + request.SizeInWords * WordSize <= InstanceBegin ) ? static_cast<void> (0) : __assert_fail ("request.Offset + request.SizeInWords * WordSize <= InstanceBegin" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 5356, __PRETTY_FUNCTION__)); | |||
5357 | continue; | |||
5358 | } | |||
5359 | ||||
5360 | unsigned beginOfScanInWords = beginOfScan / WordSize; | |||
5361 | unsigned endOfScanInWords = beginOfScanInWords + request.SizeInWords; | |||
5362 | ||||
5363 | // If the scan starts some number of words after the last one ended, | |||
5364 | // skip forward. | |||
5365 | if (beginOfScanInWords > endOfLastScanInWords) { | |||
5366 | skip(beginOfScanInWords - endOfLastScanInWords); | |||
5367 | ||||
5368 | // Otherwise, start scanning where the last left off. | |||
5369 | } else { | |||
5370 | beginOfScanInWords = endOfLastScanInWords; | |||
5371 | ||||
5372 | // If that leaves us with nothing to scan, ignore this request. | |||
5373 | if (beginOfScanInWords >= endOfScanInWords) continue; | |||
5374 | } | |||
5375 | ||||
5376 | // Scan to the end of the request. | |||
5377 | assert(beginOfScanInWords < endOfScanInWords)((beginOfScanInWords < endOfScanInWords) ? static_cast< void> (0) : __assert_fail ("beginOfScanInWords < endOfScanInWords" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 5377, __PRETTY_FUNCTION__)); | |||
5378 | scan(endOfScanInWords - beginOfScanInWords); | |||
5379 | endOfLastScanInWords = endOfScanInWords; | |||
5380 | } | |||
5381 | ||||
5382 | if (buffer.empty()) | |||
5383 | return llvm::ConstantPointerNull::get(CGM.Int8PtrTy); | |||
5384 | ||||
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); | |||
5393 | } | |||
5394 | } | |||
5395 | ||||
5396 | // Null terminate the string. | |||
5397 | buffer.push_back(0); | |||
5398 | ||||
5399 | auto *Entry = CGObjC.CreateCStringLiteral( | |||
5400 | reinterpret_cast<char *>(buffer.data()), ObjCLabelType::ClassName); | |||
5401 | return getConstantGEP(CGM.getLLVMContext(), Entry, 0, 0); | |||
5402 | } | |||
5403 | ||||
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: | |||
5413 | /// - id, Class | |||
5414 | /// - object * | |||
5415 | /// - __strong anything | |||
5416 | /// | |||
5417 | /// 2. When ForStrongLayout is false, following ivars are scanned: | |||
5418 | /// - __weak anything | |||
5419 | /// | |||
5420 | llvm::Constant * | |||
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); | |||
5431 | ||||
5432 | const ObjCInterfaceDecl *OI = OMD->getClassInterface(); | |||
5433 | SmallVector<const ObjCIvarDecl*, 32> ivars; | |||
5434 | ||||
5435 | // GC layout strings include the complete object layout, possibly | |||
5436 | // inaccurately in the non-fragile ABI; the runtime knows how to fix this | |||
5437 | // up. | |||
5438 | // | |||
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. | |||
5443 | // | |||
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); | |||
5450 | ||||
5451 | if (isNonFragileABI()) { | |||
5452 | baseOffset = beginOffset; // InstanceStart | |||
5453 | } else if (!ivars.empty()) { | |||
5454 | baseOffset = | |||
5455 | CharUnits::fromQuantity(ComputeIvarBaseOffset(CGM, OMD, ivars[0])); | |||
5456 | } else { | |||
5457 | baseOffset = CharUnits::Zero(); | |||
5458 | } | |||
5459 | ||||
5460 | baseOffset = baseOffset.alignTo(CGM.getPointerAlign()); | |||
5461 | } | |||
5462 | else { | |||
5463 | CGM.getContext().DeepCollectObjCIvars(OI, true, ivars); | |||
5464 | ||||
5465 | baseOffset = CharUnits::Zero(); | |||
5466 | } | |||
5467 | ||||
5468 | if (ivars.empty()) | |||
5469 | return llvm::Constant::getNullValue(PtrTy); | |||
5470 | ||||
5471 | IvarLayoutBuilder builder(CGM, baseOffset, endOffset, ForStrongLayout); | |||
5472 | ||||
5473 | builder.visitAggregate(ivars.begin(), ivars.end(), CharUnits::Zero(), | |||
5474 | [&](const ObjCIvarDecl *ivar) -> CharUnits { | |||
5475 | return CharUnits::fromQuantity(ComputeIvarBaseOffset(CGM, OMD, ivar)); | |||
5476 | }); | |||
5477 | ||||
5478 | if (!builder.hasBitmapData()) | |||
5479 | return llvm::Constant::getNullValue(PtrTy); | |||
5480 | ||||
5481 | llvm::SmallVector<unsigned char, 4> buffer; | |||
5482 | llvm::Constant *C = builder.buildBitmap(*this, buffer); | |||
5483 | ||||
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); | |||
5489 | } | |||
5490 | return C; | |||
5491 | } | |||
5492 | ||||
5493 | llvm::Constant *CGObjCCommonMac::GetMethodVarName(Selector Sel) { | |||
5494 | llvm::GlobalVariable *&Entry = MethodVarNames[Sel]; | |||
5495 | // FIXME: Avoid std::string in "Sel.getAsString()" | |||
5496 | if (!Entry) | |||
5497 | Entry = CreateCStringLiteral(Sel.getAsString(), ObjCLabelType::MethodVarName); | |||
5498 | return getConstantGEP(VMContext, Entry, 0, 0); | |||
5499 | } | |||
5500 | ||||
5501 | // FIXME: Merge into a single cstring creation function. | |||
5502 | llvm::Constant *CGObjCCommonMac::GetMethodVarName(IdentifierInfo *ID) { | |||
5503 | return GetMethodVarName(CGM.getContext().Selectors.getNullarySelector(ID)); | |||
5504 | } | |||
5505 | ||||
5506 | llvm::Constant *CGObjCCommonMac::GetMethodVarType(const FieldDecl *Field) { | |||
5507 | std::string TypeStr; | |||
5508 | CGM.getContext().getObjCEncodingForType(Field->getType(), TypeStr, Field); | |||
5509 | ||||
5510 | llvm::GlobalVariable *&Entry = MethodVarTypes[TypeStr]; | |||
5511 | if (!Entry) | |||
5512 | Entry = CreateCStringLiteral(TypeStr, ObjCLabelType::MethodVarType); | |||
5513 | return getConstantGEP(VMContext, Entry, 0, 0); | |||
5514 | } | |||
5515 | ||||
5516 | llvm::Constant *CGObjCCommonMac::GetMethodVarType(const ObjCMethodDecl *D, | |||
5517 | bool Extended) { | |||
5518 | std::string TypeStr = | |||
5519 | CGM.getContext().getObjCEncodingForMethodDecl(D, Extended); | |||
5520 | ||||
5521 | llvm::GlobalVariable *&Entry = MethodVarTypes[TypeStr]; | |||
5522 | if (!Entry) | |||
5523 | Entry = CreateCStringLiteral(TypeStr, ObjCLabelType::MethodVarType); | |||
5524 | return getConstantGEP(VMContext, Entry, 0, 0); | |||
5525 | } | |||
5526 | ||||
5527 | // FIXME: Merge into a single cstring creation function. | |||
5528 | llvm::Constant *CGObjCCommonMac::GetPropertyName(IdentifierInfo *Ident) { | |||
5529 | llvm::GlobalVariable *&Entry = PropertyNames[Ident]; | |||
5530 | if (!Entry) | |||
5531 | Entry = CreateCStringLiteral(Ident->getName(), ObjCLabelType::PropertyName); | |||
5532 | return getConstantGEP(VMContext, Entry, 0, 0); | |||
5533 | } | |||
5534 | ||||
5535 | // FIXME: Merge into a single cstring creation function. | |||
5536 | // FIXME: This Decl should be more precise. | |||
5537 | llvm::Constant * | |||
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)); | |||
5543 | } | |||
5544 | ||||
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")((CD && "Missing container decl in GetNameForMethod") ? static_cast<void> (0) : __assert_fail ("CD && \"Missing container decl in GetNameForMethod\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 5549, __PRETTY_FUNCTION__)); | |||
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() << ']'; | |||
5556 | } | |||
5557 | ||||
5558 | void CGObjCMac::FinishModule() { | |||
5559 | EmitModuleInfo(); | |||
5560 | ||||
5561 | // Emit the dummy bodies for any protocols which were referenced but | |||
5562 | // never defined. | |||
5563 | for (auto &entry : Protocols) { | |||
5564 | llvm::GlobalVariable *global = entry.second; | |||
5565 | if (global->hasInitializer()) | |||
5566 | continue; | |||
5567 | ||||
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); | |||
5577 | } | |||
5578 | ||||
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. | |||
5582 | // | |||
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') | |||
5589 | Asm += '\n'; | |||
5590 | ||||
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"; | |||
5600 | ||||
5601 | CGM.getModule().setModuleInlineAsm(OS.str()); | |||
5602 | } | |||
5603 | } | |||
5604 | ||||
5605 | CGObjCNonFragileABIMac::CGObjCNonFragileABIMac(CodeGen::CodeGenModule &cgm) | |||
5606 | : CGObjCCommonMac(cgm), ObjCTypes(cgm), ObjCEmptyCacheVar(nullptr), | |||
5607 | ObjCEmptyVtableVar(nullptr) { | |||
5608 | ObjCABI = 2; | |||
5609 | } | |||
5610 | ||||
5611 | /* *** */ | |||
5612 | ||||
5613 | ObjCCommonTypesHelper::ObjCCommonTypesHelper(CodeGen::CodeGenModule &cgm) | |||
5614 | : VMContext(cgm.getLLVMContext()), CGM(cgm), ExternalProtocolPtrTy(nullptr) | |||
5615 | { | |||
5616 | CodeGen::CodeGenTypes &Types = CGM.getTypes(); | |||
5617 | ASTContext &Ctx = CGM.getContext(); | |||
5618 | ||||
5619 | ShortTy = cast<llvm::IntegerType>(Types.ConvertType(Ctx.ShortTy)); | |||
5620 | IntTy = CGM.IntTy; | |||
5621 | LongTy = cast<llvm::IntegerType>(Types.ConvertType(Ctx.LongTy)); | |||
5622 | Int8PtrTy = CGM.Int8PtrTy; | |||
5623 | Int8PtrPtrTy = CGM.Int8PtrPtrTy; | |||
5624 | ||||
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; | |||
5629 | else | |||
5630 | IvarOffsetVarTy = LongTy; | |||
5631 | ||||
5632 | ObjectPtrTy = | |||
5633 | cast<llvm::PointerType>(Types.ConvertType(Ctx.getObjCIdType())); | |||
5634 | PtrObjectPtrTy = | |||
5635 | llvm::PointerType::getUnqual(ObjectPtrTy); | |||
5636 | SelectorPtrTy = | |||
5637 | cast<llvm::PointerType>(Types.ConvertType(Ctx.getObjCSelType())); | |||
5638 | ||||
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). | |||
5643 | ||||
5644 | // FIXME: This is leaked. | |||
5645 | // FIXME: Merge with rewriter code? | |||
5646 | ||||
5647 | // struct _objc_super { | |||
5648 | // id self; | |||
5649 | // Class cls; | |||
5650 | // } | |||
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(); | |||
5662 | ||||
5663 | SuperCTy = Ctx.getTagDeclType(RD); | |||
5664 | SuperPtrCTy = Ctx.getPointerType(SuperCTy); | |||
5665 | ||||
5666 | SuperTy = cast<llvm::StructType>(Types.ConvertType(SuperCTy)); | |||
5667 | SuperPtrTy = llvm::PointerType::getUnqual(SuperTy); | |||
5668 | ||||
5669 | // struct _prop_t { | |||
5670 | // char *name; | |||
5671 | // char *attributes; | |||
5672 | // } | |||
5673 | PropertyTy = llvm::StructType::create("struct._prop_t", Int8PtrTy, Int8PtrTy); | |||
5674 | ||||
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]; | |||
5679 | // } | |||
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); | |||
5684 | ||||
5685 | // struct _objc_method { | |||
5686 | // SEL _cmd; | |||
5687 | // char *method_type; | |||
5688 | // char *_imp; | |||
5689 | // } | |||
5690 | MethodTy = llvm::StructType::create("struct._objc_method", SelectorPtrTy, | |||
5691 | Int8PtrTy, Int8PtrTy); | |||
5692 | ||||
5693 | // struct _objc_cache * | |||
5694 | CacheTy = llvm::StructType::create(VMContext, "struct._objc_cache"); | |||
5695 | CachePtrTy = llvm::PointerType::getUnqual(CacheTy); | |||
5696 | } | |||
5697 | ||||
5698 | ObjCTypesHelper::ObjCTypesHelper(CodeGen::CodeGenModule &cgm) | |||
5699 | : ObjCCommonTypesHelper(cgm) { | |||
5700 | // struct _objc_method_description { | |||
5701 | // SEL name; | |||
5702 | // char *types; | |||
5703 | // } | |||
5704 | MethodDescriptionTy = llvm::StructType::create( | |||
5705 | "struct._objc_method_description", SelectorPtrTy, Int8PtrTy); | |||
5706 | ||||
5707 | // struct _objc_method_description_list { | |||
5708 | // int count; | |||
5709 | // struct _objc_method_description[1]; | |||
5710 | // } | |||
5711 | MethodDescriptionListTy = | |||
5712 | llvm::StructType::create("struct._objc_method_description_list", IntTy, | |||
5713 | llvm::ArrayType::get(MethodDescriptionTy, 0)); | |||
5714 | ||||
5715 | // struct _objc_method_description_list * | |||
5716 | MethodDescriptionListPtrTy = | |||
5717 | llvm::PointerType::getUnqual(MethodDescriptionListTy); | |||
5718 | ||||
5719 | // Protocol description structures | |||
5720 | ||||
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; | |||
5728 | // } | |||
5729 | ProtocolExtensionTy = llvm::StructType::create( | |||
5730 | "struct._objc_protocol_extension", IntTy, MethodDescriptionListPtrTy, | |||
5731 | MethodDescriptionListPtrTy, PropertyListPtrTy, Int8PtrPtrTy, | |||
5732 | PropertyListPtrTy); | |||
5733 | ||||
5734 | // struct _objc_protocol_extension * | |||
5735 | ProtocolExtensionPtrTy = llvm::PointerType::getUnqual(ProtocolExtensionTy); | |||
5736 | ||||
5737 | // Handle recursive construction of Protocol and ProtocolList types | |||
5738 | ||||
5739 | ProtocolTy = | |||
5740 | llvm::StructType::create(VMContext, "struct._objc_protocol"); | |||
5741 | ||||
5742 | ProtocolListTy = | |||
5743 | llvm::StructType::create(VMContext, "struct._objc_protocol_list"); | |||
5744 | ProtocolListTy->setBody(llvm::PointerType::getUnqual(ProtocolListTy), LongTy, | |||
5745 | llvm::ArrayType::get(ProtocolTy, 0)); | |||
5746 | ||||
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; | |||
5753 | // } | |||
5754 | ProtocolTy->setBody(ProtocolExtensionPtrTy, Int8PtrTy, | |||
5755 | llvm::PointerType::getUnqual(ProtocolListTy), | |||
5756 | MethodDescriptionListPtrTy, MethodDescriptionListPtrTy); | |||
5757 | ||||
5758 | // struct _objc_protocol_list * | |||
5759 | ProtocolListPtrTy = llvm::PointerType::getUnqual(ProtocolListTy); | |||
5760 | ||||
5761 | ProtocolPtrTy = llvm::PointerType::getUnqual(ProtocolTy); | |||
5762 | ||||
5763 | // Class description structures | |||
5764 | ||||
5765 | // struct _objc_ivar { | |||
5766 | // char *ivar_name; | |||
5767 | // char *ivar_type; | |||
5768 | // int ivar_offset; | |||
5769 | // } | |||
5770 | IvarTy = llvm::StructType::create("struct._objc_ivar", Int8PtrTy, Int8PtrTy, | |||
5771 | IntTy); | |||
5772 | ||||
5773 | // struct _objc_ivar_list * | |||
5774 | IvarListTy = | |||
5775 | llvm::StructType::create(VMContext, "struct._objc_ivar_list"); | |||
5776 | IvarListPtrTy = llvm::PointerType::getUnqual(IvarListTy); | |||
5777 | ||||
5778 | // struct _objc_method_list * | |||
5779 | MethodListTy = | |||
5780 | llvm::StructType::create(VMContext, "struct._objc_method_list"); | |||
5781 | MethodListPtrTy = llvm::PointerType::getUnqual(MethodListTy); | |||
5782 | ||||
5783 | // struct _objc_class_extension * | |||
5784 | ClassExtensionTy = llvm::StructType::create( | |||
5785 | "struct._objc_class_extension", IntTy, Int8PtrTy, PropertyListPtrTy); | |||
5786 | ClassExtensionPtrTy = llvm::PointerType::getUnqual(ClassExtensionTy); | |||
5787 | ||||
5788 | ClassTy = llvm::StructType::create(VMContext, "struct._objc_class"); | |||
5789 | ||||
5790 | // struct _objc_class { | |||
5791 | // Class isa; | |||
5792 | // Class super_class; | |||
5793 | // char *name; | |||
5794 | // long version; | |||
5795 | // long info; | |||
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; | |||
5803 | // }; | |||
5804 | ClassTy->setBody(llvm::PointerType::getUnqual(ClassTy), | |||
5805 | llvm::PointerType::getUnqual(ClassTy), Int8PtrTy, LongTy, | |||
5806 | LongTy, LongTy, IvarListPtrTy, MethodListPtrTy, CachePtrTy, | |||
5807 | ProtocolListPtrTy, Int8PtrTy, ClassExtensionPtrTy); | |||
5808 | ||||
5809 | ClassPtrTy = llvm::PointerType::getUnqual(ClassTy); | |||
5810 | ||||
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; | |||
5820 | // } | |||
5821 | CategoryTy = llvm::StructType::create( | |||
5822 | "struct._objc_category", Int8PtrTy, Int8PtrTy, MethodListPtrTy, | |||
5823 | MethodListPtrTy, ProtocolListPtrTy, IntTy, PropertyListPtrTy, | |||
5824 | PropertyListPtrTy); | |||
5825 | ||||
5826 | // Global metadata structures | |||
5827 | ||||
5828 | // struct _objc_symtab { | |||
5829 | // long sel_ref_cnt; | |||
5830 | // SEL *refs; | |||
5831 | // short cls_def_cnt; | |||
5832 | // short cat_def_cnt; | |||
5833 | // char *defs[cls_def_cnt + cat_def_cnt]; | |||
5834 | // } | |||
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); | |||
5839 | ||||
5840 | // struct _objc_module { | |||
5841 | // long version; | |||
5842 | // long size; // sizeof(struct _objc_module) | |||
5843 | // char *name; | |||
5844 | // struct _objc_symtab* symtab; | |||
5845 | // } | |||
5846 | ModuleTy = llvm::StructType::create("struct._objc_module", LongTy, LongTy, | |||
5847 | Int8PtrTy, SymtabPtrTy); | |||
5848 | ||||
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; | |||
5852 | ||||
5853 | // Exceptions | |||
5854 | llvm::Type *StackPtrTy = llvm::ArrayType::get(CGM.Int8PtrTy, 4); | |||
5855 | ||||
5856 | ExceptionDataTy = llvm::StructType::create( | |||
5857 | "struct._objc_exception_data", | |||
5858 | llvm::ArrayType::get(CGM.Int32Ty, SetJmpBufferSize), StackPtrTy); | |||
5859 | } | |||
5860 | ||||
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]; | |||
5867 | // } | |||
5868 | MethodListnfABITy = | |||
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); | |||
5873 | ||||
5874 | // struct _protocol_t { | |||
5875 | // id isa; // NULL | |||
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; | |||
5888 | // } | |||
5889 | ||||
5890 | // Holder for struct _protocol_list_t * | |||
5891 | ProtocolListnfABITy = | |||
5892 | llvm::StructType::create(VMContext, "struct._objc_protocol_list"); | |||
5893 | ||||
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, | |||
5899 | PropertyListPtrTy); | |||
5900 | ||||
5901 | // struct _protocol_t* | |||
5902 | ProtocolnfABIPtrTy = llvm::PointerType::getUnqual(ProtocolnfABITy); | |||
5903 | ||||
5904 | // struct _protocol_list_t { | |||
5905 | // long protocol_count; // Note, this is 32/64 bit | |||
5906 | // struct _protocol_t *[protocol_count]; | |||
5907 | // } | |||
5908 | ProtocolListnfABITy->setBody(LongTy, | |||
5909 | llvm::ArrayType::get(ProtocolnfABIPtrTy, 0)); | |||
5910 | ||||
5911 | // struct _objc_protocol_list* | |||
5912 | ProtocolListnfABIPtrTy = llvm::PointerType::getUnqual(ProtocolListnfABITy); | |||
5913 | ||||
5914 | // struct _ivar_t { | |||
5915 | // unsigned [long] int *offset; // pointer to ivar offset location | |||
5916 | // char *name; | |||
5917 | // char *type; | |||
5918 | // uint32_t alignment; | |||
5919 | // uint32_t size; | |||
5920 | // } | |||
5921 | IvarnfABITy = llvm::StructType::create( | |||
5922 | "struct._ivar_t", llvm::PointerType::getUnqual(IvarOffsetVarTy), | |||
5923 | Int8PtrTy, Int8PtrTy, IntTy, IntTy); | |||
5924 | ||||
5925 | // struct _ivar_list_t { | |||
5926 | // uint32 entsize; // sizeof(struct _ivar_t) | |||
5927 | // uint32 count; | |||
5928 | // struct _iver_t list[count]; | |||
5929 | // } | |||
5930 | IvarListnfABITy = | |||
5931 | llvm::StructType::create("struct._ivar_list_t", IntTy, IntTy, | |||
5932 | llvm::ArrayType::get(IvarnfABITy, 0)); | |||
5933 | ||||
5934 | IvarListnfABIPtrTy = llvm::PointerType::getUnqual(IvarListnfABITy); | |||
5935 | ||||
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; | |||
5948 | // } | |||
5949 | ||||
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); | |||
5955 | ||||
5956 | // ImpnfABITy - LLVM for id (*)(id, SEL, ...) | |||
5957 | llvm::Type *params[] = { ObjectPtrTy, SelectorPtrTy }; | |||
5958 | ImpnfABITy = llvm::FunctionType::get(ObjectPtrTy, params, false) | |||
5959 | ->getPointerTo(); | |||
5960 | ||||
5961 | // struct _class_t { | |||
5962 | // struct _class_t *isa; | |||
5963 | // struct _class_t * const superclass; | |||
5964 | // void *cache; | |||
5965 | // IMP *vtable; | |||
5966 | // struct class_ro_t *ro; | |||
5967 | // } | |||
5968 | ||||
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)); | |||
5974 | ||||
5975 | // LLVM for struct _class_t * | |||
5976 | ClassnfABIPtrTy = llvm::PointerType::getUnqual(ClassnfABITy); | |||
5977 | ||||
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; | |||
5987 | // } | |||
5988 | CategorynfABITy = llvm::StructType::create( | |||
5989 | "struct._category_t", Int8PtrTy, ClassnfABIPtrTy, MethodListnfABIPtrTy, | |||
5990 | MethodListnfABIPtrTy, ProtocolListnfABIPtrTy, PropertyListPtrTy, | |||
5991 | PropertyListPtrTy, IntTy); | |||
5992 | ||||
5993 | // New types for nonfragile abi messaging. | |||
5994 | CodeGen::CodeGenTypes &Types = CGM.getTypes(); | |||
5995 | ASTContext &Ctx = CGM.getContext(); | |||
5996 | ||||
5997 | // MessageRefTy - LLVM for: | |||
5998 | // struct _message_ref_t { | |||
5999 | // IMP messenger; | |||
6000 | // SEL name; | |||
6001 | // }; | |||
6002 | ||||
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, | |||
6010 | ICIS_NoInit)); | |||
6011 | RD->addDecl(FieldDecl::Create(Ctx, RD, SourceLocation(), SourceLocation(), | |||
6012 | nullptr, Ctx.getObjCSelType(), nullptr, nullptr, | |||
6013 | false, ICIS_NoInit)); | |||
6014 | RD->completeDefinition(); | |||
6015 | ||||
6016 | MessageRefCTy = Ctx.getTagDeclType(RD); | |||
6017 | MessageRefCPtrTy = Ctx.getPointerType(MessageRefCTy); | |||
6018 | MessageRefTy = cast<llvm::StructType>(Types.ConvertType(MessageRefCTy)); | |||
6019 | ||||
6020 | // MessageRefPtrTy - LLVM for struct _message_ref_t* | |||
6021 | MessageRefPtrTy = llvm::PointerType::getUnqual(MessageRefTy); | |||
6022 | ||||
6023 | // SuperMessageRefTy - LLVM for: | |||
6024 | // struct _super_message_ref_t { | |||
6025 | // SUPER_IMP messenger; | |||
6026 | // SEL name; | |||
6027 | // }; | |||
6028 | SuperMessageRefTy = llvm::StructType::create("struct._super_message_ref_t", | |||
6029 | ImpnfABITy, SelectorPtrTy); | |||
6030 | ||||
6031 | // SuperMessageRefPtrTy - LLVM for struct _super_message_ref_t* | |||
6032 | SuperMessageRefPtrTy = llvm::PointerType::getUnqual(SuperMessageRefTy); | |||
6033 | ||||
6034 | ||||
6035 | // struct objc_typeinfo { | |||
6036 | // const void** vtable; // objc_ehtype_vtable + 2 | |||
6037 | // const char* name; // c++ typeinfo string | |||
6038 | // Class cls; | |||
6039 | // }; | |||
6040 | EHTypeTy = llvm::StructType::create("struct._objc_typeinfo", | |||
6041 | llvm::PointerType::getUnqual(Int8PtrTy), | |||
6042 | Int8PtrTy, ClassnfABIPtrTy); | |||
6043 | EHTypePtrTy = llvm::PointerType::getUnqual(EHTypeTy); | |||
6044 | } | |||
6045 | ||||
6046 | llvm::Function *CGObjCNonFragileABIMac::ModuleInitFunction() { | |||
6047 | FinishNonFragileABIModule(); | |||
6048 | ||||
6049 | return nullptr; | |||
6050 | } | |||
6051 | ||||
6052 | void CGObjCNonFragileABIMac::AddModuleClassList( | |||
6053 | ArrayRef<llvm::GlobalValue *> Container, StringRef SymbolName, | |||
6054 | StringRef SectionName) { | |||
6055 | unsigned NumClasses = Container.size(); | |||
6056 | ||||
6057 | if (!NumClasses) | |||
6058 | return; | |||
6059 | ||||
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, | |||
6066 | Symbols.size()), | |||
6067 | Symbols); | |||
6068 | ||||
6069 | // Section name is obtained by calling GetSectionName, which returns | |||
6070 | // sections in the __DATA segment on MachO. | |||
6071 | assert((!CGM.getTriple().isOSBinFormatMachO() ||(((!CGM.getTriple().isOSBinFormatMachO() || SectionName.startswith ("__DATA")) && "SectionName expected to start with __DATA on MachO" ) ? static_cast<void> (0) : __assert_fail ("(!CGM.getTriple().isOSBinFormatMachO() || SectionName.startswith(\"__DATA\")) && \"SectionName expected to start with __DATA on MachO\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 6073, __PRETTY_FUNCTION__)) | |||
6072 | SectionName.startswith("__DATA")) &&(((!CGM.getTriple().isOSBinFormatMachO() || SectionName.startswith ("__DATA")) && "SectionName expected to start with __DATA on MachO" ) ? static_cast<void> (0) : __assert_fail ("(!CGM.getTriple().isOSBinFormatMachO() || SectionName.startswith(\"__DATA\")) && \"SectionName expected to start with __DATA on MachO\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 6073, __PRETTY_FUNCTION__)) | |||
6073 | "SectionName expected to start with __DATA on MachO")(((!CGM.getTriple().isOSBinFormatMachO() || SectionName.startswith ("__DATA")) && "SectionName expected to start with __DATA on MachO" ) ? static_cast<void> (0) : __assert_fail ("(!CGM.getTriple().isOSBinFormatMachO() || SectionName.startswith(\"__DATA\")) && \"SectionName expected to start with __DATA on MachO\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 6073, __PRETTY_FUNCTION__)); | |||
6074 | llvm::GlobalValue::LinkageTypes LT = | |||
6075 | getLinkageTypeForObjCMetadata(CGM, SectionName); | |||
6076 | llvm::GlobalVariable *GV = | |||
6077 | new llvm::GlobalVariable(CGM.getModule(), Init->getType(), false, LT, Init, | |||
6078 | SymbolName); | |||
6079 | GV->setAlignment(CGM.getDataLayout().getABITypeAlignment(Init->getType())); | |||
6080 | GV->setSection(SectionName); | |||
6081 | CGM.addCompilerUsedGlobal(GV); | |||
6082 | } | |||
6083 | ||||
6084 | void CGObjCNonFragileABIMac::FinishNonFragileABIModule() { | |||
6085 | // nonfragile abi has no module definition. | |||
6086 | ||||
6087 | // Build list of all implemented class addresses in array | |||
6088 | // L_OBJC_LABEL_CLASS_$. | |||
6089 | ||||
6090 | for (unsigned i=0, NumClasses=ImplementedClasses.size(); i<NumClasses; i++) { | |||
6091 | const ObjCInterfaceDecl *ID = ImplementedClasses[i]; | |||
6092 | assert(ID)((ID) ? static_cast<void> (0) : __assert_fail ("ID", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 6092, __PRETTY_FUNCTION__)); | |||
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); | |||
6098 | } | |||
6099 | } | |||
6100 | ||||
6101 | AddModuleClassList(DefinedClasses, "OBJC_LABEL_CLASS_$", | |||
6102 | GetSectionName("__objc_classlist", | |||
6103 | "regular,no_dead_strip")); | |||
6104 | ||||
6105 | AddModuleClassList(DefinedNonLazyClasses, "OBJC_LABEL_NONLAZY_CLASS_$", | |||
6106 | GetSectionName("__objc_nlclslist", | |||
6107 | "regular,no_dead_strip")); | |||
6108 | ||||
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")); | |||
6120 | ||||
6121 | EmitImageInfo(); | |||
6122 | } | |||
6123 | ||||
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: | |||
6133 | return false; | |||
6134 | case CodeGenOptions::NonLegacy: | |||
6135 | return true; | |||
6136 | case CodeGenOptions::Mixed: | |||
6137 | break; | |||
6138 | } | |||
6139 | ||||
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")); | |||
6149 | ||||
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")); | |||
6156 | } | |||
6157 | ||||
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")); | |||
6165 | ||||
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")); | |||
6171 | ||||
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") | |||
6177 | }; | |||
6178 | VTableDispatchMethods.insert( | |||
6179 | CGM.getContext().Selectors.getSelector(3, KeyIdents)); | |||
6180 | } | |||
6181 | } | |||
6182 | ||||
6183 | return VTableDispatchMethods.count(Sel); | |||
6184 | } | |||
6185 | ||||
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; | |||
6199 | /// } | |||
6200 | /// | |||
6201 | llvm::GlobalVariable * CGObjCNonFragileABIMac::BuildClassRoTInitializer( | |||
6202 | unsigned flags, | |||
6203 | unsigned InstanceStart, | |||
6204 | unsigned InstanceSize, | |||
6205 | const ObjCImplementationDecl *ID) { | |||
6206 | std::string ClassName = ID->getObjCRuntimeNameAsString(); | |||
6207 | ||||
6208 | CharUnits beginInstance = CharUnits::fromQuantity(InstanceStart); | |||
6209 | CharUnits endInstance = CharUnits::fromQuantity(InstanceSize); | |||
6210 | ||||
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; | |||
6216 | ||||
6217 | ConstantInitBuilder builder(CGM); | |||
6218 | auto values = builder.beginStruct(ObjCTypes.ClassRonfABITy); | |||
6219 | ||||
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())); | |||
6227 | ||||
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); | |||
6233 | } else { | |||
6234 | for (const auto *MD : ID->instance_methods()) | |||
6235 | methods.push_back(MD); | |||
6236 | ||||
6237 | for (const auto *PID : ID->property_impls()) { | |||
6238 | if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize){ | |||
6239 | ObjCPropertyDecl *PD = PID->getPropertyDecl(); | |||
6240 | ||||
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); | |||
6247 | } | |||
6248 | } | |||
6249 | } | |||
6250 | ||||
6251 | values.add(emitMethodList(ID->getObjCRuntimeNameAsString(), | |||
6252 | (flags & NonFragileABI_Class_Meta) | |||
6253 | ? MethodListType::ClassMethods | |||
6254 | : MethodListType::InstanceMethods, | |||
6255 | methods)); | |||
6256 | ||||
6257 | const ObjCInterfaceDecl *OID = ID->getClassInterface(); | |||
6258 | assert(OID && "CGObjCNonFragileABIMac::BuildClassRoTInitializer")((OID && "CGObjCNonFragileABIMac::BuildClassRoTInitializer" ) ? static_cast<void> (0) : __assert_fail ("OID && \"CGObjCNonFragileABIMac::BuildClassRoTInitializer\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 6258, __PRETTY_FUNCTION__)); | |||
6259 | values.add(EmitProtocolList("_OBJC_CLASS_PROTOCOLS_$_" | |||
6260 | + OID->getObjCRuntimeNameAsString(), | |||
6261 | OID->all_referenced_protocol_begin(), | |||
6262 | OID->all_referenced_protocol_end())); | |||
6263 | ||||
6264 | if (flags & NonFragileABI_Class_Meta) { | |||
6265 | values.addNullPointer(ObjCTypes.IvarListnfABIPtrTy); | |||
6266 | values.add(GetIvarLayoutName(nullptr, ObjCTypes)); | |||
6267 | values.add(EmitPropertyList( | |||
6268 | "_OBJC_$_CLASS_PROP_LIST_" + ID->getObjCRuntimeNameAsString(), | |||
6269 | ID, ID->getClassInterface(), ObjCTypes, true)); | |||
6270 | } else { | |||
6271 | values.add(EmitIvarList(ID)); | |||
6272 | values.add(BuildWeakIvarLayout(ID, beginInstance, endInstance, hasMRCWeak)); | |||
6273 | values.add(EmitPropertyList( | |||
6274 | "_OBJC_$_PROP_LIST_" + ID->getObjCRuntimeNameAsString(), | |||
6275 | ID, ID->getClassInterface(), ObjCTypes, false)); | |||
6276 | } | |||
6277 | ||||
6278 | llvm::SmallString<64> roLabel; | |||
6279 | llvm::raw_svector_ostream(roLabel) | |||
6280 | << ((flags & NonFragileABI_Class_Meta) ? "_OBJC_METACLASS_RO_$_" | |||
6281 | : "_OBJC_CLASS_RO_$_") | |||
6282 | << ClassName; | |||
6283 | ||||
6284 | return finishAndCreateGlobal(values, roLabel, CGM); | |||
6285 | } | |||
6286 | ||||
6287 | /// Build the metaclass object for a class. | |||
6288 | /// | |||
6289 | /// struct _class_t { | |||
6290 | /// struct _class_t *isa; | |||
6291 | /// struct _class_t * const superclass; | |||
6292 | /// void *cache; | |||
6293 | /// IMP *vtable; | |||
6294 | /// struct class_ro_t *ro; | |||
6295 | /// } | |||
6296 | /// | |||
6297 | llvm::GlobalVariable * | |||
6298 | CGObjCNonFragileABIMac::BuildClassObject(const ObjCInterfaceDecl *CI, | |||
6299 | bool isMetaclass, | |||
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); | |||
6306 | values.add(IsAGV); | |||
6307 | if (SuperClassGV) { | |||
6308 | values.add(SuperClassGV); | |||
6309 | } else { | |||
6310 | values.addNullPointer(ObjCTypes.ClassnfABIPtrTy); | |||
6311 | } | |||
6312 | values.add(ObjCEmptyCacheVar); | |||
6313 | values.add(ObjCEmptyVtableVar); | |||
6314 | values.add(ClassRoGV); | |||
6315 | ||||
6316 | llvm::GlobalVariable *GV = | |||
6317 | cast<llvm::GlobalVariable>(GetClassGlobal(CI, isMetaclass, ForDefinition)); | |||
6318 | values.finishAndSetAsInitializer(GV); | |||
6319 | ||||
6320 | if (CGM.getTriple().isOSBinFormatMachO()) | |||
6321 | GV->setSection("__DATA, __objc_data"); | |||
6322 | GV->setAlignment( | |||
6323 | CGM.getDataLayout().getABITypeAlignment(ObjCTypes.ClassnfABITy)); | |||
6324 | if (!CGM.getTriple().isOSBinFormatCOFF()) | |||
6325 | if (HiddenVisibility) | |||
6326 | GV->setVisibility(llvm::GlobalValue::HiddenVisibility); | |||
6327 | return GV; | |||
6328 | } | |||
6329 | ||||
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>(); | |||
6335 | } | |||
6336 | ||||
6337 | void CGObjCNonFragileABIMac::GetClassSizeInfo(const ObjCImplementationDecl *OID, | |||
6338 | uint32_t &InstanceStart, | |||
6339 | uint32_t &InstanceSize) { | |||
6340 | const ASTRecordLayout &RL = | |||
6341 | CGM.getContext().getASTObjCImplementationLayout(OID); | |||
6342 | ||||
6343 | // InstanceSize is really instance end. | |||
6344 | InstanceSize = RL.getDataSize().getQuantity(); | |||
6345 | ||||
6346 | // If there are no fields, the start is the same as the end. | |||
6347 | if (!RL.getFieldCount()) | |||
6348 | InstanceStart = InstanceSize; | |||
6349 | else | |||
6350 | InstanceStart = RL.getFieldOffset(0) / CGM.getContext().getCharWidth(); | |||
6351 | } | |||
6352 | ||||
6353 | static llvm::GlobalValue::DLLStorageClassTypes getStorage(CodeGenModule &CGM, | |||
6354 | StringRef Name) { | |||
6355 | IdentifierInfo &II = CGM.getContext().Idents.get(Name); | |||
6356 | TranslationUnitDecl *TUDecl = CGM.getContext().getTranslationUnitDecl(); | |||
6357 | DeclContext *DC = TranslationUnitDecl::castToDeclContext(TUDecl); | |||
6358 | ||||
6359 | const VarDecl *VD = nullptr; | |||
6360 | for (const auto &Result : DC->lookup(&II)) | |||
6361 | if ((VD = dyn_cast<VarDecl>(Result))) | |||
6362 | break; | |||
6363 | ||||
6364 | if (!VD) | |||
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; | |||
6371 | } | |||
6372 | ||||
6373 | void CGObjCNonFragileABIMac::GenerateClass(const ObjCImplementationDecl *ID) { | |||
6374 | if (!ObjCEmptyCacheVar) { | |||
6375 | 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")); | |||
6381 | ||||
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"); | |||
6389 | else | |||
6390 | ObjCEmptyVtableVar = | |||
6391 | llvm::ConstantPointerNull::get(ObjCTypes.ImpnfABITy->getPointerTo()); | |||
6392 | } | |||
6393 | ||||
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; | |||
6399 | ||||
6400 | llvm::Constant *SuperClassGV, *IsAGV; | |||
6401 | ||||
6402 | const auto *CI = ID->getClassInterface(); | |||
6403 | assert(CI && "CGObjCNonFragileABIMac::GenerateClass - class is 0")((CI && "CGObjCNonFragileABIMac::GenerateClass - class is 0" ) ? static_cast<void> (0) : __assert_fail ("CI && \"CGObjCNonFragileABIMac::GenerateClass - class is 0\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 6403, __PRETTY_FUNCTION__)); | |||
6404 | ||||
6405 | // Build the flags for the metaclass. | |||
6406 | bool classIsHidden = (CGM.getTriple().isOSBinFormatCOFF()) | |||
6407 | ? !CI->hasAttr<DLLExportAttr>() | |||
6408 | : CI->getVisibility() == HiddenVisibility; | |||
6409 | if (classIsHidden) | |||
6410 | flags |= NonFragileABI_Class_Hidden; | |||
6411 | ||||
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; | |||
6418 | } | |||
6419 | ||||
6420 | if (!CI->getSuperClass()) { | |||
6421 | // class is root | |||
6422 | flags |= NonFragileABI_Class_Root; | |||
6423 | ||||
6424 | SuperClassGV = GetClassGlobal(CI, /*metaclass*/ false, NotForDefinition); | |||
6425 | IsAGV = GetClassGlobal(CI, /*metaclass*/ true, NotForDefinition); | |||
6426 | } else { | |||
6427 | // Has a root. Current class is not a root. | |||
6428 | const ObjCInterfaceDecl *Root = ID->getClassInterface(); | |||
6429 | while (const ObjCInterfaceDecl *Super = Root->getSuperClass()) | |||
6430 | Root = Super; | |||
6431 | ||||
6432 | const auto *Super = CI->getSuperClass(); | |||
6433 | IsAGV = GetClassGlobal(Root, /*metaclass*/ true, NotForDefinition); | |||
6434 | SuperClassGV = GetClassGlobal(Super, /*metaclass*/ true, NotForDefinition); | |||
6435 | } | |||
6436 | ||||
6437 | llvm::GlobalVariable *CLASS_RO_GV = | |||
6438 | BuildClassRoTInitializer(flags, InstanceStart, InstanceSize, ID); | |||
6439 | ||||
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); | |||
6445 | ||||
6446 | // Metadata for the class | |||
6447 | flags = 0; | |||
6448 | if (classIsHidden) | |||
6449 | flags |= NonFragileABI_Class_Hidden; | |||
6450 | ||||
6451 | if (ID->hasNonZeroConstructors() || ID->hasDestructors()) { | |||
6452 | flags |= NonFragileABI_Class_HasCXXStructors; | |||
6453 | ||||
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; | |||
6462 | } | |||
6463 | ||||
6464 | if (hasObjCExceptionAttribute(CGM.getContext(), CI)) | |||
6465 | flags |= NonFragileABI_Class_Exception; | |||
6466 | ||||
6467 | if (!CI->getSuperClass()) { | |||
6468 | flags |= NonFragileABI_Class_Root; | |||
6469 | SuperClassGV = nullptr; | |||
6470 | } else { | |||
6471 | // Has a root. Current class is not a root. | |||
6472 | const auto *Super = CI->getSuperClass(); | |||
6473 | SuperClassGV = GetClassGlobal(Super, /*metaclass*/ false, NotForDefinition); | |||
6474 | } | |||
6475 | ||||
6476 | GetClassSizeInfo(ID, InstanceStart, InstanceSize); | |||
6477 | CLASS_RO_GV = | |||
6478 | BuildClassRoTInitializer(flags, InstanceStart, InstanceSize, ID); | |||
6479 | ||||
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); | |||
6486 | ||||
6487 | // Determine if this class is also "non-lazy". | |||
6488 | if (ImplementationIsNonLazy(ID)) | |||
6489 | DefinedNonLazyClasses.push_back(ClassMD); | |||
6490 | ||||
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(); | |||
6496 | } | |||
6497 | ||||
6498 | /// GenerateProtocolRef - This routine is called to generate code for | |||
6499 | /// a protocol reference expression; as in: | |||
6500 | /// @code | |||
6501 | /// @protocol(Proto1); | |||
6502 | /// @endcode | |||
6503 | /// It generates a weak reference to l_OBJC_PROTOCOL_REFERENCE_$_Proto1 | |||
6504 | /// which will hold address of the protocol meta-data. | |||
6505 | /// | |||
6506 | llvm::Value *CGObjCNonFragileABIMac::GenerateProtocolRef(CodeGenFunction &CGF, | |||
6507 | const ObjCProtocolDecl *PD) { | |||
6508 | ||||
6509 | // This routine is called for @protocol only. So, we must build definition | |||
6510 | // of protocol's meta-data (not a reference to it!) | |||
6511 | // | |||
6512 | llvm::Constant *Init = | |||
6513 | llvm::ConstantExpr::getBitCast(GetOrEmitProtocol(PD), | |||
6514 | ObjCTypes.getExternalProtocolPtrTy()); | |||
6515 | ||||
6516 | std::string ProtocolName("_OBJC_PROTOCOL_REFERENCE_$_"); | |||
6517 | ProtocolName += PD->getObjCRuntimeNameAsString(); | |||
6518 | ||||
6519 | CharUnits Align = CGF.getPointerAlign(); | |||
6520 | ||||
6521 | llvm::GlobalVariable *PTGV = CGM.getModule().getGlobalVariable(ProtocolName); | |||
6522 | if (PTGV) | |||
6523 | return CGF.Builder.CreateAlignedLoad(PTGV, Align); | |||
6524 | PTGV = new llvm::GlobalVariable(CGM.getModule(), Init->getType(), false, | |||
6525 | llvm::GlobalValue::WeakAnyLinkage, Init, | |||
6526 | ProtocolName); | |||
6527 | PTGV->setSection(GetSectionName("__objc_protorefs", | |||
6528 | "coalesced,no_dead_strip")); | |||
6529 | PTGV->setVisibility(llvm::GlobalValue::HiddenVisibility); | |||
6530 | PTGV->setAlignment(Align.getQuantity()); | |||
6531 | if (!CGM.getTriple().isOSBinFormatMachO()) | |||
6532 | PTGV->setComdat(CGM.getModule().getOrInsertComdat(ProtocolName)); | |||
6533 | CGM.addUsedGlobal(PTGV); | |||
6534 | return CGF.Builder.CreateAlignedLoad(PTGV, Align); | |||
6535 | } | |||
6536 | ||||
6537 | /// GenerateCategory - Build metadata for a category implementation. | |||
6538 | /// struct _category_t { | |||
6539 | /// const char * const name; | |||
6540 | /// struct _class_t *const cls; | |||
6541 | /// const struct _method_list_t * const instance_methods; | |||
6542 | /// const struct _method_list_t * const class_methods; | |||
6543 | /// const struct _protocol_list_t * const protocols; | |||
6544 | /// const struct _prop_list_t * const properties; | |||
6545 | /// const struct _prop_list_t * const class_properties; | |||
6546 | /// const uint32_t size; | |||
6547 | /// } | |||
6548 | /// | |||
6549 | void CGObjCNonFragileABIMac::GenerateCategory(const ObjCCategoryImplDecl *OCD) { | |||
6550 | const ObjCInterfaceDecl *Interface = OCD->getClassInterface(); | |||
6551 | const char *Prefix = "_OBJC_$_CATEGORY_"; | |||
6552 | ||||
6553 | llvm::SmallString<64> ExtCatName(Prefix); | |||
6554 | ExtCatName += Interface->getObjCRuntimeNameAsString(); | |||
6555 | ExtCatName += "_$_"; | |||
6556 | ExtCatName += OCD->getNameAsString(); | |||
6557 | ||||
6558 | ConstantInitBuilder builder(CGM); | |||
6559 | auto values = builder.beginStruct(ObjCTypes.CategorynfABITy); | |||
6560 | values.add(GetClassName(OCD->getIdentifier()->getName())); | |||
6561 | // meta-class entry symbol | |||
6562 | values.add(GetClassGlobal(Interface, /*metaclass*/ false, NotForDefinition)); | |||
6563 | std::string listName = | |||
6564 | (Interface->getObjCRuntimeNameAsString() + "_$_" + OCD->getName()).str(); | |||
6565 | ||||
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); | |||
6571 | } else { | |||
6572 | classMethods.push_back(MD); | |||
6573 | } | |||
6574 | } | |||
6575 | ||||
6576 | values.add(emitMethodList(listName, MethodListType::CategoryInstanceMethods, | |||
6577 | instanceMethods)); | |||
6578 | values.add(emitMethodList(listName, MethodListType::CategoryClassMethods, | |||
6579 | classMethods)); | |||
6580 | ||||
6581 | const ObjCCategoryDecl *Category = | |||
6582 | Interface->FindCategoryDeclaration(OCD->getIdentifier()); | |||
6583 | if (Category) { | |||
6584 | SmallString<256> ExtName; | |||
6585 | llvm::raw_svector_ostream(ExtName) << Interface->getObjCRuntimeNameAsString() << "_$_" | |||
6586 | << OCD->getName(); | |||
6587 | values.add(EmitProtocolList("_OBJC_CATEGORY_PROTOCOLS_$_" | |||
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)); | |||
6596 | } else { | |||
6597 | values.addNullPointer(ObjCTypes.ProtocolListnfABIPtrTy); | |||
6598 | values.addNullPointer(ObjCTypes.PropertyListPtrTy); | |||
6599 | values.addNullPointer(ObjCTypes.PropertyListPtrTy); | |||
6600 | } | |||
6601 | ||||
6602 | unsigned Size = CGM.getDataLayout().getTypeAllocSize(ObjCTypes.CategorynfABITy); | |||
6603 | values.addInt(ObjCTypes.IntTy, Size); | |||
6604 | ||||
6605 | llvm::GlobalVariable *GCATV = | |||
6606 | finishAndCreateGlobal(values, ExtCatName.str(), CGM); | |||
6607 | CGM.addCompilerUsedGlobal(GCATV); | |||
6608 | if (Interface->hasAttr<ObjCClassStubAttr>()) | |||
6609 | DefinedStubCategories.push_back(GCATV); | |||
6610 | else | |||
6611 | DefinedCategories.push_back(GCATV); | |||
6612 | ||||
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(); | |||
6618 | } | |||
6619 | ||||
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. | |||
6623 | /// | |||
6624 | /// struct _objc_method { | |||
6625 | /// SEL _cmd; | |||
6626 | /// char *method_type; | |||
6627 | /// char *_imp; | |||
6628 | /// } | |||
6629 | void CGObjCNonFragileABIMac::emitMethodConstant(ConstantArrayBuilder &builder, | |||
6630 | const ObjCMethodDecl *MD, | |||
6631 | bool forProtocol) { | |||
6632 | auto method = builder.beginStruct(ObjCTypes.MethodTy); | |||
6633 | method.addBitCast(GetMethodVarName(MD->getSelector()), | |||
6634 | ObjCTypes.SelectorPtrTy); | |||
6635 | method.add(GetMethodVarType(MD)); | |||
6636 | ||||
6637 | if (forProtocol) { | |||
6638 | // Protocol methods have no implementation. So, this entry is always NULL. | |||
6639 | method.addNullPointer(ObjCTypes.Int8PtrTy); | |||
6640 | } else { | |||
6641 | llvm::Function *fn = GetMethodDefinition(MD); | |||
6642 | assert(fn && "no definition for method?")((fn && "no definition for method?") ? static_cast< void> (0) : __assert_fail ("fn && \"no definition for method?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 6642, __PRETTY_FUNCTION__)); | |||
6643 | method.addBitCast(fn, ObjCTypes.Int8PtrTy); | |||
6644 | } | |||
6645 | ||||
6646 | method.finishAndAddTo(builder); | |||
6647 | } | |||
6648 | ||||
6649 | /// Build meta-data for method declarations. | |||
6650 | /// | |||
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]; | |||
6655 | /// } | |||
6656 | /// | |||
6657 | llvm::Constant * | |||
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); | |||
6663 | ||||
6664 | StringRef prefix; | |||
6665 | bool forProtocol; | |||
6666 | switch (kind) { | |||
6667 | case MethodListType::CategoryInstanceMethods: | |||
6668 | prefix = "_OBJC_$_CATEGORY_INSTANCE_METHODS_"; | |||
6669 | forProtocol = false; | |||
6670 | break; | |||
6671 | case MethodListType::CategoryClassMethods: | |||
6672 | prefix = "_OBJC_$_CATEGORY_CLASS_METHODS_"; | |||
6673 | forProtocol = false; | |||
6674 | break; | |||
6675 | case MethodListType::InstanceMethods: | |||
6676 | prefix = "_OBJC_$_INSTANCE_METHODS_"; | |||
6677 | forProtocol = false; | |||
6678 | break; | |||
6679 | case MethodListType::ClassMethods: | |||
6680 | prefix = "_OBJC_$_CLASS_METHODS_"; | |||
6681 | forProtocol = false; | |||
6682 | break; | |||
6683 | ||||
6684 | case MethodListType::ProtocolInstanceMethods: | |||
6685 | prefix = "_OBJC_$_PROTOCOL_INSTANCE_METHODS_"; | |||
6686 | forProtocol = true; | |||
6687 | break; | |||
6688 | case MethodListType::ProtocolClassMethods: | |||
6689 | prefix = "_OBJC_$_PROTOCOL_CLASS_METHODS_"; | |||
6690 | forProtocol = true; | |||
6691 | break; | |||
6692 | case MethodListType::OptionalProtocolInstanceMethods: | |||
6693 | prefix = "_OBJC_$_PROTOCOL_INSTANCE_METHODS_OPT_"; | |||
6694 | forProtocol = true; | |||
6695 | break; | |||
6696 | case MethodListType::OptionalProtocolClassMethods: | |||
6697 | prefix = "_OBJC_$_PROTOCOL_CLASS_METHODS_OPT_"; | |||
6698 | forProtocol = true; | |||
6699 | break; | |||
6700 | } | |||
6701 | ||||
6702 | ConstantInitBuilder builder(CGM); | |||
6703 | auto values = builder.beginStruct(); | |||
6704 | ||||
6705 | // sizeof(struct _objc_method) | |||
6706 | unsigned Size = CGM.getDataLayout().getTypeAllocSize(ObjCTypes.MethodTy); | |||
6707 | values.addInt(ObjCTypes.IntTy, Size); | |||
6708 | // method_count | |||
6709 | values.addInt(ObjCTypes.IntTy, methods.size()); | |||
6710 | auto methodArray = values.beginArray(ObjCTypes.MethodTy); | |||
6711 | for (auto MD : methods) { | |||
6712 | emitMethodConstant(methodArray, MD, forProtocol); | |||
6713 | } | |||
6714 | methodArray.finishAndAddTo(values); | |||
6715 | ||||
6716 | llvm::GlobalVariable *GV = finishAndCreateGlobal(values, prefix + name, CGM); | |||
6717 | CGM.addCompilerUsedGlobal(GV); | |||
6718 | return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.MethodListnfABIPtrTy); | |||
6719 | } | |||
6720 | ||||
6721 | /// ObjCIvarOffsetVariable - Returns the ivar offset variable for | |||
6722 | /// the given ivar. | |||
6723 | llvm::GlobalVariable * | |||
6724 | CGObjCNonFragileABIMac::ObjCIvarOffsetVariable(const ObjCInterfaceDecl *ID, | |||
6725 | const ObjCIvarDecl *Ivar) { | |||
6726 | const ObjCInterfaceDecl *Container = Ivar->getContainingInterface(); | |||
6727 | llvm::SmallString<64> Name("OBJC_IVAR_$_"); | |||
6728 | Name += Container->getObjCRuntimeNameAsString(); | |||
6729 | Name += "."; | |||
6730 | Name += Ivar->getName(); | |||
6731 | llvm::GlobalVariable *IvarOffsetGV = CGM.getModule().getGlobalVariable(Name); | |||
6732 | if (!IvarOffsetGV) { | |||
6733 | 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; | |||
6741 | ||||
6742 | const ObjCInterfaceDecl *ContainingID = Ivar->getContainingInterface(); | |||
6743 | ||||
6744 | if (ContainingID->hasAttr<DLLImportAttr>()) | |||
6745 | IvarOffsetGV | |||
6746 | ->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass); | |||
6747 | else if (ContainingID->hasAttr<DLLExportAttr>() && !IsPrivateOrPackage) | |||
6748 | IvarOffsetGV | |||
6749 | ->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass); | |||
6750 | } | |||
6751 | } | |||
6752 | return IvarOffsetGV; | |||
6753 | } | |||
6754 | ||||
6755 | llvm::Constant * | |||
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)); | |||
6764 | ||||
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); | |||
6772 | else | |||
6773 | IvarOffsetGV->setVisibility(llvm::GlobalValue::DefaultVisibility); | |||
6774 | } | |||
6775 | ||||
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); | |||
6781 | ||||
6782 | if (CGM.getTriple().isOSBinFormatMachO()) | |||
6783 | IvarOffsetGV->setSection("__DATA, __objc_ivar"); | |||
6784 | return IvarOffsetGV; | |||
6785 | } | |||
6786 | ||||
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 | |||
6792 | /// char *name; | |||
6793 | /// char *type; | |||
6794 | /// uint32_t alignment; | |||
6795 | /// uint32_t size; | |||
6796 | /// } | |||
6797 | /// struct _ivar_list_t { | |||
6798 | /// uint32 entsize; // sizeof(struct _ivar_t) | |||
6799 | /// uint32 count; | |||
6800 | /// struct _iver_t list[count]; | |||
6801 | /// } | |||
6802 | /// | |||
6803 | ||||
6804 | llvm::Constant *CGObjCNonFragileABIMac::EmitIvarList( | |||
6805 | const ObjCImplementationDecl *ID) { | |||
6806 | ||||
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); | |||
6813 | ||||
6814 | const ObjCInterfaceDecl *OID = ID->getClassInterface(); | |||
6815 | assert(OID && "CGObjCNonFragileABIMac::EmitIvarList - null interface")((OID && "CGObjCNonFragileABIMac::EmitIvarList - null interface" ) ? static_cast<void> (0) : __assert_fail ("OID && \"CGObjCNonFragileABIMac::EmitIvarList - null interface\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 6815, __PRETTY_FUNCTION__)); | |||
6816 | ||||
6817 | // FIXME. Consolidate this with similar code in GenerateClass. | |||
6818 | ||||
6819 | for (const ObjCIvarDecl *IVD = OID->all_declared_ivar_begin(); | |||
6820 | IVD; IVD = IVD->getNextIvar()) { | |||
6821 | // Ignore unnamed bit-fields. | |||
6822 | if (!IVD->getDeclName()) | |||
6823 | continue; | |||
6824 | ||||
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 | |||
6841 | // bitfield right! | |||
6842 | ivar.addInt(ObjCTypes.IntTy, Size); | |||
6843 | ivar.finishAndAddTo(ivars); | |||
6844 | } | |||
6845 | // Return null for empty list. | |||
6846 | if (ivars.empty()) { | |||
6847 | ivars.abandon(); | |||
6848 | ivarList.abandon(); | |||
6849 | return llvm::Constant::getNullValue(ObjCTypes.IvarListnfABIPtrTy); | |||
6850 | } | |||
6851 | ||||
6852 | auto ivarCount = ivars.size(); | |||
6853 | ivars.finishAndAddTo(ivarList); | |||
6854 | ivarList.fillPlaceholderWithInt(ivarCountSlot, ObjCTypes.IntTy, ivarCount); | |||
6855 | ||||
6856 | const char *Prefix = "_OBJC_$_INSTANCE_VARIABLES_"; | |||
6857 | llvm::GlobalVariable *GV = finishAndCreateGlobal( | |||
6858 | ivarList, Prefix + OID->getObjCRuntimeNameAsString(), CGM); | |||
6859 | CGM.addCompilerUsedGlobal(GV); | |||
6860 | return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.IvarListnfABIPtrTy); | |||
6861 | } | |||
6862 | ||||
6863 | llvm::Constant *CGObjCNonFragileABIMac::GetOrEmitProtocolRef( | |||
6864 | const ObjCProtocolDecl *PD) { | |||
6865 | llvm::GlobalVariable *&Entry = Protocols[PD->getIdentifier()]; | |||
6866 | ||||
6867 | if (!Entry) { | |||
6868 | // We use the initializer as a marker of whether this is a forward | |||
6869 | // reference or not. At module finalization we add the empty | |||
6870 | // contents for protocols which were referenced but never defined. | |||
6871 | llvm::SmallString<64> Protocol; | |||
6872 | llvm::raw_svector_ostream(Protocol) << "_OBJC_PROTOCOL_$_" | |||
6873 | << PD->getObjCRuntimeNameAsString(); | |||
6874 | ||||
6875 | Entry = new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.ProtocolnfABITy, | |||
6876 | false, llvm::GlobalValue::ExternalLinkage, | |||
6877 | nullptr, Protocol); | |||
6878 | if (!CGM.getTriple().isOSBinFormatMachO()) | |||
6879 | Entry->setComdat(CGM.getModule().getOrInsertComdat(Protocol)); | |||
6880 | } | |||
6881 | ||||
6882 | return Entry; | |||
6883 | } | |||
6884 | ||||
6885 | /// GetOrEmitProtocol - Generate the protocol meta-data: | |||
6886 | /// @code | |||
6887 | /// struct _protocol_t { | |||
6888 | /// id isa; // NULL | |||
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; | |||
6901 | /// } | |||
6902 | /// @endcode | |||
6903 | /// | |||
6904 | ||||
6905 | llvm::Constant *CGObjCNonFragileABIMac::GetOrEmitProtocol( | |||
6906 | const ObjCProtocolDecl *PD) { | |||
6907 | llvm::GlobalVariable *Entry = Protocols[PD->getIdentifier()]; | |||
6908 | ||||
6909 | // Early exit if a defining object has already been generated. | |||
6910 | if (Entry && Entry->hasInitializer()) | |||
6911 | return Entry; | |||
6912 | ||||
6913 | // Use the protocol definition, if there is one. | |||
6914 | assert(PD->hasDefinition() &&((PD->hasDefinition() && "emitting protocol metadata without definition" ) ? static_cast<void> (0) : __assert_fail ("PD->hasDefinition() && \"emitting protocol metadata without definition\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 6915, __PRETTY_FUNCTION__)) | |||
6915 | "emitting protocol metadata without definition")((PD->hasDefinition() && "emitting protocol metadata without definition" ) ? static_cast<void> (0) : __assert_fail ("PD->hasDefinition() && \"emitting protocol metadata without definition\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 6915, __PRETTY_FUNCTION__)); | |||
6916 | PD = PD->getDefinition(); | |||
6917 | ||||
6918 | auto methodLists = ProtocolMethodLists::get(PD); | |||
6919 | ||||
6920 | ConstantInitBuilder builder(CGM); | |||
6921 | auto values = builder.beginStruct(ObjCTypes.ProtocolnfABITy); | |||
6922 | ||||
6923 | // isa is NULL | |||
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)); | |||
6941 | uint32_t Size = | |||
6942 | CGM.getDataLayout().getTypeAllocSize(ObjCTypes.ProtocolnfABITy); | |||
6943 | values.addInt(ObjCTypes.IntTy, Size); | |||
6944 | values.addInt(ObjCTypes.IntTy, 0); | |||
6945 | values.add(EmitProtocolMethodTypes("_OBJC_$_PROTOCOL_METHOD_TYPES_" | |||
6946 | + PD->getObjCRuntimeNameAsString(), | |||
6947 | methodLists.emitExtendedTypesArray(this), | |||
6948 | ObjCTypes)); | |||
6949 | ||||
6950 | // const char *demangledName; | |||
6951 | values.addNullPointer(ObjCTypes.Int8PtrTy); | |||
6952 | ||||
6953 | values.add(EmitPropertyList( | |||
6954 | "_OBJC_$_CLASS_PROP_LIST_" + PD->getObjCRuntimeNameAsString(), | |||
6955 | nullptr, PD, ObjCTypes, true)); | |||
6956 | ||||
6957 | if (Entry) { | |||
6958 | // Already created, fix the linkage and update the initializer. | |||
6959 | Entry->setLinkage(llvm::GlobalValue::WeakAnyLinkage); | |||
6960 | values.finishAndSetAsInitializer(Entry); | |||
6961 | } else { | |||
6962 | llvm::SmallString<64> symbolName; | |||
6963 | llvm::raw_svector_ostream(symbolName) | |||
6964 | << "_OBJC_PROTOCOL_$_" << PD->getObjCRuntimeNameAsString(); | |||
6965 | ||||
6966 | Entry = values.finishAndCreateGlobal(symbolName, CGM.getPointerAlign(), | |||
6967 | /*constant*/ false, | |||
6968 | llvm::GlobalValue::WeakAnyLinkage); | |||
6969 | if (!CGM.getTriple().isOSBinFormatMachO()) | |||
6970 | Entry->setComdat(CGM.getModule().getOrInsertComdat(symbolName)); | |||
6971 | ||||
6972 | Protocols[PD->getIdentifier()] = Entry; | |||
6973 | } | |||
6974 | Entry->setVisibility(llvm::GlobalValue::HiddenVisibility); | |||
6975 | CGM.addUsedGlobal(Entry); | |||
6976 | ||||
6977 | // Use this protocol meta-data to build protocol list table in section | |||
6978 | // __DATA, __objc_protolist | |||
6979 | llvm::SmallString<64> ProtocolRef; | |||
6980 | llvm::raw_svector_ostream(ProtocolRef) << "_OBJC_LABEL_PROTOCOL_$_" | |||
6981 | << PD->getObjCRuntimeNameAsString(); | |||
6982 | ||||
6983 | llvm::GlobalVariable *PTGV = | |||
6984 | new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.ProtocolnfABIPtrTy, | |||
6985 | false, llvm::GlobalValue::WeakAnyLinkage, Entry, | |||
6986 | ProtocolRef); | |||
6987 | if (!CGM.getTriple().isOSBinFormatMachO()) | |||
6988 | PTGV->setComdat(CGM.getModule().getOrInsertComdat(ProtocolRef)); | |||
6989 | PTGV->setAlignment( | |||
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); | |||
6995 | return Entry; | |||
6996 | } | |||
6997 | ||||
6998 | /// EmitProtocolList - Generate protocol list meta-data: | |||
6999 | /// @code | |||
7000 | /// struct _protocol_list_t { | |||
7001 | /// long protocol_count; // Note, this is 32/64 bit | |||
7002 | /// struct _protocol_t[protocol_count]; | |||
7003 | /// } | |||
7004 | /// @endcode | |||
7005 | /// | |||
7006 | llvm::Constant * | |||
7007 | CGObjCNonFragileABIMac::EmitProtocolList(Twine Name, | |||
7008 | ObjCProtocolDecl::protocol_iterator begin, | |||
7009 | ObjCProtocolDecl::protocol_iterator end) { | |||
7010 | SmallVector<llvm::Constant *, 16> ProtocolRefs; | |||
7011 | ||||
7012 | // Just return null for empty protocol lists | |||
7013 | if (begin == end) | |||
7014 | return llvm::Constant::getNullValue(ObjCTypes.ProtocolListnfABIPtrTy); | |||
7015 | ||||
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); | |||
7021 | if (GV) | |||
7022 | return llvm::ConstantExpr::getBitCast(GV, ObjCTypes.ProtocolListnfABIPtrTy); | |||
7023 | ||||
7024 | ConstantInitBuilder builder(CGM); | |||
7025 | auto values = builder.beginStruct(); | |||
7026 | auto countSlot = values.addPlaceholder(); | |||
7027 | ||||
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); | |||
7034 | ||||
7035 | array.finishAndAddTo(values); | |||
7036 | values.fillPlaceholderWithInt(countSlot, ObjCTypes.LongTy, count); | |||
7037 | ||||
7038 | GV = finishAndCreateGlobal(values, Name, CGM); | |||
7039 | CGM.addCompilerUsedGlobal(GV); | |||
7040 | return llvm::ConstantExpr::getBitCast(GV, | |||
7041 | ObjCTypes.ProtocolListnfABIPtrTy); | |||
7042 | } | |||
7043 | ||||
7044 | /// EmitObjCValueForIvar - Code Gen for nonfragile ivar reference. | |||
7045 | /// This code gen. amounts to generating code for: | |||
7046 | /// @code | |||
7047 | /// (type *)((char *)base + _OBJC_IVAR_$_.ivar; | |||
7048 | /// @encode | |||
7049 | /// | |||
7050 | LValue CGObjCNonFragileABIMac::EmitObjCValueForIvar( | |||
7051 | CodeGen::CodeGenFunction &CGF, | |||
7052 | QualType ObjectTy, | |||
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, | |||
7059 | Offset); | |||
7060 | } | |||
7061 | ||||
7062 | llvm::Value * | |||
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)); | |||
7071 | } else { | |||
7072 | llvm::GlobalVariable *GV = ObjCIvarOffsetVariable(Interface, Ivar); | |||
7073 | IvarOffsetValue = | |||
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)); | |||
7079 | } | |||
7080 | ||||
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; | |||
7088 | } | |||
7089 | ||||
7090 | static void appendSelectorForMessageRefTable(std::string &buffer, | |||
7091 | Selector selector) { | |||
7092 | if (selector.isUnarySelector()) { | |||
7093 | buffer += selector.getNameForSlot(0); | |||
7094 | return; | |||
7095 | } | |||
7096 | ||||
7097 | for (unsigned i = 0, e = selector.getNumArgs(); i != e; ++i) { | |||
7098 | buffer += selector.getNameForSlot(i); | |||
7099 | buffer += '_'; | |||
7100 | } | |||
7101 | } | |||
7102 | ||||
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. | |||
7113 | RValue | |||
7114 | CGObjCNonFragileABIMac::EmitVTableMessageSend(CodeGenFunction &CGF, | |||
7115 | ReturnValueSlot returnSlot, | |||
7116 | QualType resultType, | |||
7117 | Selector selector, | |||
7118 | llvm::Value *arg0, | |||
7119 | QualType arg0Type, | |||
7120 | bool isSuper, | |||
7121 | const CallArgList &formalArgs, | |||
7122 | const ObjCMethodDecl *method) { | |||
7123 | // Compute the actual arguments. | |||
7124 | CallArgList args; | |||
7125 | ||||
7126 | // First argument: the receiver / super-call structure. | |||
7127 | if (!isSuper) | |||
7128 | arg0 = CGF.Builder.CreateBitCast(arg0, ObjCTypes.ObjectPtrTy); | |||
7129 | args.add(RValue::get(arg0), arg0Type); | |||
7130 | ||||
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); | |||
7134 | ||||
7135 | args.insert(args.end(), formalArgs.begin(), formalArgs.end()); | |||
7136 | ||||
7137 | MessageSendInfo MSI = getMessageSendInfo(method, resultType, args); | |||
7138 | ||||
7139 | NullReturnState nullReturn; | |||
7140 | ||||
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. | |||
7144 | // | |||
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)) { | |||
7151 | if (isSuper) { | |||
7152 | fn = ObjCTypes.getMessageSendSuper2StretFixupFn(); | |||
7153 | messageRefName += "objc_msgSendSuper2_stret_fixup"; | |||
7154 | } else { | |||
7155 | nullReturn.init(CGF, arg0); | |||
7156 | fn = ObjCTypes.getMessageSendStretFixupFn(); | |||
7157 | messageRefName += "objc_msgSend_stret_fixup"; | |||
7158 | } | |||
7159 | } else if (!isSuper && CGM.ReturnTypeUsesFPRet(resultType)) { | |||
7160 | fn = ObjCTypes.getMessageSendFpretFixupFn(); | |||
7161 | messageRefName += "objc_msgSend_fpret_fixup"; | |||
7162 | } else { | |||
7163 | if (isSuper) { | |||
7164 | fn = ObjCTypes.getMessageSendSuper2FixupFn(); | |||
7165 | messageRefName += "objc_msgSendSuper2_fixup"; | |||
7166 | } else { | |||
7167 | fn = ObjCTypes.getMessageSendFixupFn(); | |||
7168 | messageRefName += "objc_msgSend_fixup"; | |||
7169 | } | |||
7170 | } | |||
7171 | assert(fn && "CGObjCNonFragileABIMac::EmitMessageSend")((fn && "CGObjCNonFragileABIMac::EmitMessageSend") ? static_cast <void> (0) : __assert_fail ("fn && \"CGObjCNonFragileABIMac::EmitMessageSend\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 7171, __PRETTY_FUNCTION__)); | |||
7172 | messageRefName += '_'; | |||
7173 | ||||
7174 | // Append the selector name, except use underscores anywhere we | |||
7175 | // would have used colons. | |||
7176 | appendSelectorForMessageRefTable(messageRefName, selector); | |||
7177 | ||||
7178 | llvm::GlobalVariable *messageRef | |||
7179 | = CGM.getModule().getGlobalVariable(messageRefName); | |||
7180 | if (!messageRef) { | |||
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), | |||
7188 | /*constant*/ false, | |||
7189 | llvm::GlobalValue::WeakAnyLinkage); | |||
7190 | messageRef->setVisibility(llvm::GlobalValue::HiddenVisibility); | |||
7191 | messageRef->setSection(GetSectionName("__objc_msgrefs", "coalesced")); | |||
7192 | } | |||
7193 | ||||
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; | |||
7201 | break; | |||
7202 | } | |||
7203 | } | |||
7204 | ||||
7205 | Address mref = | |||
7206 | Address(CGF.Builder.CreateBitCast(messageRef, ObjCTypes.MessageRefPtrTy), | |||
7207 | CGF.getPointerAlign()); | |||
7208 | ||||
7209 | // Update the message ref argument. | |||
7210 | args[1].setRValue(RValue::get(mref.getPointer())); | |||
7211 | ||||
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"); | |||
7215 | ||||
7216 | calleePtr = CGF.Builder.CreateBitCast(calleePtr, MSI.MessengerType); | |||
7217 | CGCallee callee(CGCalleeInfo(), calleePtr); | |||
7218 | ||||
7219 | RValue result = CGF.EmitCall(MSI.CallInfo, callee, returnSlot, args); | |||
7220 | return nullReturn.complete(CGF, returnSlot, result, resultType, formalArgs, | |||
7221 | requiresnullCheck ? method : nullptr); | |||
7222 | } | |||
7223 | ||||
7224 | /// Generate code for a message send expression in the nonfragile abi. | |||
7225 | CodeGen::RValue | |||
7226 | CGObjCNonFragileABIMac::GenerateMessageSend(CodeGen::CodeGenFunction &CGF, | |||
7227 | ReturnValueSlot Return, | |||
7228 | QualType ResultType, | |||
7229 | Selector Sel, | |||
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); | |||
7242 | } | |||
7243 | ||||
7244 | llvm::Constant * | |||
7245 | CGObjCNonFragileABIMac::GetClassGlobal(const ObjCInterfaceDecl *ID, | |||
7246 | bool metaclass, | |||
7247 | ForDefinition_t isForDefinition) { | |||
7248 | auto prefix = | |||
7249 | (metaclass ? getMetaclassSymbolPrefix() : getClassSymbolPrefix()); | |||
7250 | return GetClassGlobal((prefix + ID->getObjCRuntimeNameAsString()).str(), | |||
7251 | isForDefinition, | |||
7252 | ID->isWeakImported(), | |||
7253 | !isForDefinition | |||
7254 | && CGM.getTriple().isOSBinFormatCOFF() | |||
7255 | && ID->hasAttr<DLLImportAttr>()); | |||
7256 | } | |||
7257 | ||||
7258 | llvm::Constant * | |||
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; | |||
7265 | ||||
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, | |||
7269 | nullptr, Name); | |||
7270 | ||||
7271 | if (DLLImport) | |||
7272 | NewGV->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass); | |||
7273 | ||||
7274 | if (GV) { | |||
7275 | GV->replaceAllUsesWith( | |||
7276 | llvm::ConstantExpr::getBitCast(NewGV, GV->getType())); | |||
7277 | GV->eraseFromParent(); | |||
7278 | } | |||
7279 | GV = NewGV; | |||
7280 | CGM.getModule().getGlobalList().push_back(GV); | |||
7281 | } | |||
7282 | ||||
7283 | assert(GV->getLinkage() == L)((GV->getLinkage() == L) ? static_cast<void> (0) : __assert_fail ("GV->getLinkage() == L", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 7283, __PRETTY_FUNCTION__)); | |||
7284 | return GV; | |||
7285 | } | |||
7286 | ||||
7287 | llvm::Constant * | |||
7288 | CGObjCNonFragileABIMac::GetClassGlobalForClassRef(const ObjCInterfaceDecl *ID) { | |||
7289 | llvm::Constant *ClassGV = GetClassGlobal(ID, /*metaclass*/ false, | |||
7290 | NotForDefinition); | |||
7291 | ||||
7292 | if (!ID->hasAttr<ObjCClassStubAttr>()) | |||
7293 | return ClassGV; | |||
7294 | ||||
7295 | ClassGV = llvm::ConstantExpr::getPointerCast(ClassGV, ObjCTypes.Int8PtrTy); | |||
7296 | ||||
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); | |||
7301 | } | |||
7302 | ||||
7303 | llvm::Value * | |||
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"); | |||
7312 | } | |||
7313 | ||||
7314 | CharUnits Align = CGF.getPointerAlign(); | |||
7315 | return CGF.Builder.CreateAlignedLoad(Entry, Align); | |||
7316 | } | |||
7317 | ||||
7318 | llvm::Value * | |||
7319 | CGObjCNonFragileABIMac::EmitClassRefFromId(CodeGenFunction &CGF, | |||
7320 | IdentifierInfo *II, | |||
7321 | const ObjCInterfaceDecl *ID) { | |||
7322 | llvm::GlobalVariable *&Entry = ClassReferences[II]; | |||
7323 | ||||
7324 | if (!Entry) { | |||
7325 | llvm::Constant *ClassGV; | |||
7326 | if (ID) { | |||
7327 | ClassGV = GetClassGlobalForClassRef(ID); | |||
7328 | } else { | |||
7329 | ClassGV = GetClassGlobal((getClassSymbolPrefix() + II->getName()).str(), | |||
7330 | NotForDefinition); | |||
7331 | assert(ClassGV->getType() == ObjCTypes.ClassnfABIPtrTy &&((ClassGV->getType() == ObjCTypes.ClassnfABIPtrTy && "classref was emitted with the wrong type?") ? static_cast< void> (0) : __assert_fail ("ClassGV->getType() == ObjCTypes.ClassnfABIPtrTy && \"classref was emitted with the wrong type?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 7332, __PRETTY_FUNCTION__)) | |||
7332 | "classref was emitted with the wrong type?")((ClassGV->getType() == ObjCTypes.ClassnfABIPtrTy && "classref was emitted with the wrong type?") ? static_cast< void> (0) : __assert_fail ("ClassGV->getType() == ObjCTypes.ClassnfABIPtrTy && \"classref was emitted with the wrong type?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 7332, __PRETTY_FUNCTION__)); | |||
7333 | } | |||
7334 | ||||
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); | |||
7344 | ||||
7345 | CGM.addCompilerUsedGlobal(Entry); | |||
7346 | } | |||
7347 | ||||
7348 | return EmitLoadOfClassRef(CGF, ID, Entry); | |||
7349 | } | |||
7350 | ||||
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); | |||
7357 | ||||
7358 | return EmitClassRefFromId(CGF, ID->getIdentifier(), ID); | |||
7359 | } | |||
7360 | ||||
7361 | llvm::Value *CGObjCNonFragileABIMac::EmitNSAutoreleasePoolClassRef( | |||
7362 | CodeGenFunction &CGF) { | |||
7363 | IdentifierInfo *II = &CGM.getContext().Idents.get("NSAutoreleasePool"); | |||
7364 | return EmitClassRefFromId(CGF, II, nullptr); | |||
7365 | } | |||
7366 | ||||
7367 | llvm::Value * | |||
7368 | CGObjCNonFragileABIMac::EmitSuperClassRef(CodeGenFunction &CGF, | |||
7369 | const ObjCInterfaceDecl *ID) { | |||
7370 | llvm::GlobalVariable *&Entry = SuperClassReferences[ID->getIdentifier()]; | |||
7371 | ||||
7372 | if (!Entry) { | |||
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_$_"); | |||
7380 | Entry->setAlignment(CGF.getPointerAlign().getQuantity()); | |||
7381 | Entry->setSection(SectionName); | |||
7382 | CGM.addCompilerUsedGlobal(Entry); | |||
7383 | } | |||
7384 | ||||
7385 | return EmitLoadOfClassRef(CGF, ID, Entry); | |||
7386 | } | |||
7387 | ||||
7388 | /// EmitMetaClassRef - Return a Value * of the address of _class_t | |||
7389 | /// meta-data | |||
7390 | /// | |||
7391 | llvm::Value *CGObjCNonFragileABIMac::EmitMetaClassRef(CodeGenFunction &CGF, | |||
7392 | const ObjCInterfaceDecl *ID, | |||
7393 | bool Weak) { | |||
7394 | CharUnits Align = CGF.getPointerAlign(); | |||
7395 | llvm::GlobalVariable * &Entry = MetaClassReferences[ID->getIdentifier()]; | |||
7396 | if (!Entry) { | |||
7397 | auto MetaClassGV = GetClassGlobal(ID, /*metaclass*/ true, NotForDefinition); | |||
7398 | std::string SectionName = | |||
7399 | GetSectionName("__objc_superrefs", "regular,no_dead_strip"); | |||
7400 | Entry = new llvm::GlobalVariable( | |||
7401 | CGM.getModule(), ObjCTypes.ClassnfABIPtrTy, false, | |||
7402 | getLinkageTypeForObjCMetadata(CGM, SectionName), MetaClassGV, | |||
7403 | "OBJC_CLASSLIST_SUP_REFS_$_"); | |||
7404 | Entry->setAlignment(Align.getQuantity()); | |||
7405 | Entry->setSection(SectionName); | |||
7406 | CGM.addCompilerUsedGlobal(Entry); | |||
7407 | } | |||
7408 | ||||
7409 | return CGF.Builder.CreateAlignedLoad(Entry, Align); | |||
7410 | } | |||
7411 | ||||
7412 | /// GetClass - Return a reference to the class for the given interface | |||
7413 | /// decl. | |||
7414 | llvm::Value *CGObjCNonFragileABIMac::GetClass(CodeGenFunction &CGF, | |||
7415 | const ObjCInterfaceDecl *ID) { | |||
7416 | if (ID->isWeakImported()) { | |||
7417 | auto ClassGV = GetClassGlobal(ID, /*metaclass*/ false, NotForDefinition); | |||
7418 | (void)ClassGV; | |||
7419 | assert(!isa<llvm::GlobalVariable>(ClassGV) ||((!isa<llvm::GlobalVariable>(ClassGV) || cast<llvm:: GlobalVariable>(ClassGV)->hasExternalWeakLinkage()) ? static_cast <void> (0) : __assert_fail ("!isa<llvm::GlobalVariable>(ClassGV) || cast<llvm::GlobalVariable>(ClassGV)->hasExternalWeakLinkage()" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 7420, __PRETTY_FUNCTION__)) | |||
7420 | cast<llvm::GlobalVariable>(ClassGV)->hasExternalWeakLinkage())((!isa<llvm::GlobalVariable>(ClassGV) || cast<llvm:: GlobalVariable>(ClassGV)->hasExternalWeakLinkage()) ? static_cast <void> (0) : __assert_fail ("!isa<llvm::GlobalVariable>(ClassGV) || cast<llvm::GlobalVariable>(ClassGV)->hasExternalWeakLinkage()" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 7420, __PRETTY_FUNCTION__)); | |||
7421 | } | |||
7422 | ||||
7423 | return EmitClassRef(CGF, ID); | |||
7424 | } | |||
7425 | ||||
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. | |||
7429 | CodeGen::RValue | |||
7430 | CGObjCNonFragileABIMac::GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF, | |||
7431 | ReturnValueSlot Return, | |||
7432 | QualType ResultType, | |||
7433 | Selector Sel, | |||
7434 | const ObjCInterfaceDecl *Class, | |||
7435 | bool isCategoryImpl, | |||
7436 | llvm::Value *Receiver, | |||
7437 | bool IsClassMessage, | |||
7438 | const CodeGen::CallArgList &CallArgs, | |||
7439 | const ObjCMethodDecl *Method) { | |||
7440 | // ... | |||
7441 | // Create and init a super structure; this is a (receiver, class) | |||
7442 | // pair we will pass to objc_msgSendSuper. | |||
7443 | Address ObjCSuper = | |||
7444 | CGF.CreateTempAlloca(ObjCTypes.SuperTy, CGF.getPointerAlign(), | |||
7445 | "objc_super"); | |||
7446 | ||||
7447 | llvm::Value *ReceiverAsObject = | |||
7448 | CGF.Builder.CreateBitCast(Receiver, ObjCTypes.ObjectPtrTy); | |||
7449 | CGF.Builder.CreateStore(ReceiverAsObject, | |||
7450 | CGF.Builder.CreateStructGEP(ObjCSuper, 0)); | |||
7451 | ||||
7452 | // If this is a class message the metaclass is passed as the target. | |||
7453 | llvm::Value *Target; | |||
7454 | if (IsClassMessage) | |||
7455 | Target = EmitMetaClassRef(CGF, Class, Class->isWeakImported()); | |||
7456 | else | |||
7457 | Target = EmitSuperClassRef(CGF, Class); | |||
7458 | ||||
7459 | // FIXME: We shouldn't need to do this cast, rectify the ASTContext and | |||
7460 | // ObjCTypes types. | |||
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)); | |||
7465 | ||||
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); | |||
7474 | } | |||
7475 | ||||
7476 | llvm::Value *CGObjCNonFragileABIMac::EmitSelector(CodeGenFunction &CGF, | |||
7477 | Selector Sel) { | |||
7478 | Address Addr = EmitSelectorAddr(CGF, Sel); | |||
7479 | ||||
7480 | llvm::LoadInst* LI = CGF.Builder.CreateLoad(Addr); | |||
7481 | LI->setMetadata(CGM.getModule().getMDKindID("invariant.load"), | |||
7482 | llvm::MDNode::get(VMContext, None)); | |||
7483 | return LI; | |||
7484 | } | |||
7485 | ||||
7486 | Address CGObjCNonFragileABIMac::EmitSelectorAddr(CodeGenFunction &CGF, | |||
7487 | Selector Sel) { | |||
7488 | llvm::GlobalVariable *&Entry = SelectorReferences[Sel]; | |||
7489 | ||||
7490 | CharUnits Align = CGF.getPointerAlign(); | |||
7491 | if (!Entry) { | |||
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); | |||
7505 | } | |||
7506 | ||||
7507 | return Address(Entry, Align); | |||
7508 | } | |||
7509 | ||||
7510 | /// EmitObjCIvarAssign - Code gen for assigning to a __strong object. | |||
7511 | /// objc_assign_ivar (id src, id *dst, ptrdiff_t) | |||
7512 | /// | |||
7513 | void CGObjCNonFragileABIMac::EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF, | |||
7514 | llvm::Value *src, | |||
7515 | Address dst, | |||
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")((Size <= 8 && "does not support size > 8") ? static_cast <void> (0) : __assert_fail ("Size <= 8 && \"does not support size > 8\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 7520, __PRETTY_FUNCTION__)); | |||
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); | |||
7524 | } | |||
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); | |||
7529 | } | |||
7530 | ||||
7531 | /// EmitObjCStrongCastAssign - Code gen for assigning to a __strong cast object. | |||
7532 | /// objc_assign_strongCast (id src, id *dst) | |||
7533 | /// | |||
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")((Size <= 8 && "does not support size > 8") ? static_cast <void> (0) : __assert_fail ("Size <= 8 && \"does not support size > 8\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 7540, __PRETTY_FUNCTION__)); | |||
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); | |||
7544 | } | |||
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"); | |||
7550 | } | |||
7551 | ||||
7552 | void CGObjCNonFragileABIMac::EmitGCMemmoveCollectable( | |||
7553 | CodeGen::CodeGenFunction &CGF, | |||
7554 | Address DestPtr, | |||
7555 | Address SrcPtr, | |||
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); | |||
7561 | } | |||
7562 | ||||
7563 | /// EmitObjCWeakRead - Code gen for loading value of a __weak | |||
7564 | /// object: objc_read_weak (id *src) | |||
7565 | /// | |||
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); | |||
7575 | return read_weak; | |||
7576 | } | |||
7577 | ||||
7578 | /// EmitObjCWeakAssign - Code gen for assigning to a __weak object. | |||
7579 | /// objc_assign_weak (id src, id *dst) | |||
7580 | /// | |||
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")((Size <= 8 && "does not support size > 8") ? static_cast <void> (0) : __assert_fail ("Size <= 8 && \"does not support size > 8\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 7586, __PRETTY_FUNCTION__)); | |||
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); | |||
7590 | } | |||
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"); | |||
7596 | } | |||
7597 | ||||
7598 | /// EmitObjCGlobalAssign - Code gen for assigning to a __strong object. | |||
7599 | /// objc_assign_global (id src, id *dst) | |||
7600 | /// | |||
7601 | void CGObjCNonFragileABIMac::EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF, | |||
7602 | llvm::Value *src, Address dst, | |||
7603 | bool threadlocal) { | |||
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")((Size <= 8 && "does not support size > 8") ? static_cast <void> (0) : __assert_fail ("Size <= 8 && \"does not support size > 8\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 7607, __PRETTY_FUNCTION__)); | |||
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); | |||
7611 | } | |||
7612 | src = CGF.Builder.CreateBitCast(src, ObjCTypes.ObjectPtrTy); | |||
7613 | dst = CGF.Builder.CreateBitCast(dst, ObjCTypes.PtrObjectPtrTy); | |||
7614 | llvm::Value *args[] = { src, dst.getPointer() }; | |||
7615 | if (!threadlocal) | |||
7616 | CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignGlobalFn(), | |||
7617 | args, "globalassign"); | |||
7618 | else | |||
7619 | CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignThreadLocalFn(), | |||
7620 | args, "threadlocalassign"); | |||
7621 | } | |||
7622 | ||||
7623 | void | |||
7624 | CGObjCNonFragileABIMac::EmitSynchronizedStmt(CodeGen::CodeGenFunction &CGF, | |||
7625 | const ObjCAtSynchronizedStmt &S) { | |||
7626 | EmitAtSynchronizedStmt(CGF, S, ObjCTypes.getSyncEnterFn(), | |||
7627 | ObjCTypes.getSyncExitFn()); | |||
7628 | } | |||
7629 | ||||
7630 | llvm::Constant * | |||
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"); | |||
7635 | if (!IDEHType) { | |||
7636 | IDEHType = | |||
7637 | new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.EHTypeTy, false, | |||
7638 | llvm::GlobalValue::ExternalLinkage, nullptr, | |||
7639 | "OBJC_EHTYPE_id"); | |||
7640 | if (CGM.getTriple().isOSBinFormatCOFF()) | |||
7641 | IDEHType->setDLLStorageClass(getStorage(CGM, "OBJC_EHTYPE_id")); | |||
7642 | } | |||
7643 | return IDEHType; | |||
7644 | } | |||
7645 | ||||
7646 | // All other types should be Objective-C interface pointer types. | |||
7647 | const ObjCObjectPointerType *PT = T->getAs<ObjCObjectPointerType>(); | |||
7648 | assert(PT && "Invalid @catch type.")((PT && "Invalid @catch type.") ? static_cast<void > (0) : __assert_fail ("PT && \"Invalid @catch type.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 7648, __PRETTY_FUNCTION__)); | |||
7649 | ||||
7650 | const ObjCInterfaceType *IT = PT->getInterfaceType(); | |||
7651 | assert(IT && "Invalid @catch type.")((IT && "Invalid @catch type.") ? static_cast<void > (0) : __assert_fail ("IT && \"Invalid @catch type.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 7651, __PRETTY_FUNCTION__)); | |||
7652 | ||||
7653 | return GetInterfaceEHType(IT->getDecl(), NotForDefinition); | |||
7654 | } | |||
7655 | ||||
7656 | void CGObjCNonFragileABIMac::EmitTryStmt(CodeGen::CodeGenFunction &CGF, | |||
7657 | const ObjCAtTryStmt &S) { | |||
7658 | EmitTryCatchStmt(CGF, S, ObjCTypes.getObjCBeginCatchFn(), | |||
7659 | ObjCTypes.getObjCEndCatchFn(), | |||
7660 | ObjCTypes.getExceptionRethrowFn()); | |||
7661 | } | |||
7662 | ||||
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(); | |||
7673 | } else { | |||
7674 | llvm::CallBase *Call = | |||
7675 | CGF.EmitRuntimeCallOrInvoke(ObjCTypes.getExceptionRethrowFn()); | |||
7676 | Call->setDoesNotReturn(); | |||
7677 | } | |||
7678 | ||||
7679 | CGF.Builder.CreateUnreachable(); | |||
7680 | if (ClearInsertionPoint) | |||
7681 | CGF.Builder.ClearInsertionPoint(); | |||
7682 | } | |||
7683 | ||||
7684 | llvm::Constant * | |||
7685 | CGObjCNonFragileABIMac::GetInterfaceEHType(const ObjCInterfaceDecl *ID, | |||
7686 | ForDefinition_t IsForDefinition) { | |||
7687 | llvm::GlobalVariable * &Entry = EHTypeReferences[ID->getIdentifier()]; | |||
7688 | StringRef ClassName = ID->getObjCRuntimeNameAsString(); | |||
7689 | ||||
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) { | |||
7693 | if (Entry) | |||
7694 | return Entry; | |||
7695 | ||||
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); | |||
7704 | return Entry; | |||
7705 | } | |||
7706 | } | |||
7707 | ||||
7708 | // Otherwise we need to either make a new entry or fill in the initializer. | |||
7709 | assert((!Entry || !Entry->hasInitializer()) && "Duplicate EHType definition")(((!Entry || !Entry->hasInitializer()) && "Duplicate EHType definition" ) ? static_cast<void> (0) : __assert_fail ("(!Entry || !Entry->hasInitializer()) && \"Duplicate EHType definition\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 7709, __PRETTY_FUNCTION__)); | |||
7710 | ||||
7711 | std::string VTableName = "objc_ehtype_vtable"; | |||
7712 | auto *VTableGV = CGM.getModule().getGlobalVariable(VTableName); | |||
7713 | if (!VTableGV) { | |||
7714 | VTableGV = | |||
7715 | new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.Int8PtrTy, false, | |||
7716 | llvm::GlobalValue::ExternalLinkage, nullptr, | |||
7717 | VTableName); | |||
7718 | if (CGM.getTriple().isOSBinFormatCOFF()) | |||
7719 | VTableGV->setDLLStorageClass(getStorage(CGM, VTableName)); | |||
7720 | } | |||
7721 | ||||
7722 | llvm::Value *VTableIdx = llvm::ConstantInt::get(CGM.Int32Ty, 2); | |||
7723 | ConstantInitBuilder builder(CGM); | |||
7724 | auto values = builder.beginStruct(ObjCTypes.EHTypeTy); | |||
7725 | values.add( | |||
7726 | llvm::ConstantExpr::getInBoundsGetElementPtr(VTableGV->getValueType(), | |||
7727 | VTableGV, VTableIdx)); | |||
7728 | values.add(GetClassName(ClassName)); | |||
7729 | values.add(GetClassGlobal(ID, /*metaclass*/ false, NotForDefinition)); | |||
7730 | ||||
7731 | llvm::GlobalValue::LinkageTypes L = IsForDefinition | |||
7732 | ? llvm::GlobalValue::ExternalLinkage | |||
7733 | : llvm::GlobalValue::WeakAnyLinkage; | |||
7734 | if (Entry) { | |||
7735 | values.finishAndSetAsInitializer(Entry); | |||
7736 | Entry->setAlignment(CGM.getPointerAlign().getQuantity()); | |||
7737 | } else { | |||
7738 | Entry = values.finishAndCreateGlobal("OBJC_EHTYPE_$_" + ClassName, | |||
7739 | CGM.getPointerAlign(), | |||
7740 | /*constant*/ false, | |||
7741 | L); | |||
7742 | if (hasObjCExceptionAttribute(CGM.getContext(), ID)) | |||
7743 | CGM.setGVProperties(Entry, ID); | |||
7744 | } | |||
7745 | assert(Entry->getLinkage() == L)((Entry->getLinkage() == L) ? static_cast<void> (0) : __assert_fail ("Entry->getLinkage() == L", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 7745, __PRETTY_FUNCTION__)); | |||
7746 | ||||
7747 | if (!CGM.getTriple().isOSBinFormatCOFF()) | |||
7748 | if (ID->getVisibility() == HiddenVisibility) | |||
7749 | Entry->setVisibility(llvm::GlobalValue::HiddenVisibility); | |||
7750 | ||||
7751 | if (IsForDefinition) | |||
7752 | if (CGM.getTriple().isOSBinFormatMachO()) | |||
7753 | Entry->setSection("__DATA,__objc_const"); | |||
7754 | ||||
7755 | return Entry; | |||
7756 | } | |||
7757 | ||||
7758 | /* *** */ | |||
7759 | ||||
7760 | CodeGen::CGObjCRuntime * | |||
7761 | CodeGen::CreateMacObjCRuntime(CodeGen::CodeGenModule &CGM) { | |||
7762 | switch (CGM.getLangOpts().ObjCRuntime.getKind()) { | |||
7763 | case ObjCRuntime::FragileMacOSX: | |||
7764 | return new CGObjCMac(CGM); | |||
7765 | ||||
7766 | case ObjCRuntime::MacOSX: | |||
7767 | case ObjCRuntime::iOS: | |||
7768 | case ObjCRuntime::WatchOS: | |||
7769 | return new CGObjCNonFragileABIMac(CGM); | |||
7770 | ||||
7771 | case ObjCRuntime::GNUstep: | |||
7772 | case ObjCRuntime::GCC: | |||
7773 | case ObjCRuntime::ObjFW: | |||
7774 | llvm_unreachable("these runtimes are not Mac runtimes")::llvm::llvm_unreachable_internal("these runtimes are not Mac runtimes" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 7774); | |||
7775 | } | |||
7776 | llvm_unreachable("bad runtime")::llvm::llvm_unreachable_internal("bad runtime", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGObjCMac.cpp" , 7776); | |||
7777 | } |