/Users/buildslave/jenkins/sharedspace/clang-stage2-coverage-R@2/llvm/tools/clang/lib/CodeGen/CGObjCGNU.cpp
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1 | | //===------- CGObjCGNU.cpp - Emit LLVM Code from ASTs for a Module --------===// |
2 | | // |
3 | | // The LLVM Compiler Infrastructure |
4 | | // |
5 | | // This file is distributed under the University of Illinois Open Source |
6 | | // License. See LICENSE.TXT for details. |
7 | | // |
8 | | //===----------------------------------------------------------------------===// |
9 | | // |
10 | | // This provides Objective-C code generation targeting the GNU runtime. The |
11 | | // class in this file generates structures used by the GNU Objective-C runtime |
12 | | // library. These structures are defined in objc/objc.h and objc/objc-api.h in |
13 | | // the GNU runtime distribution. |
14 | | // |
15 | | //===----------------------------------------------------------------------===// |
16 | | |
17 | | #include "CGObjCRuntime.h" |
18 | | #include "CGCleanup.h" |
19 | | #include "CodeGenFunction.h" |
20 | | #include "CodeGenModule.h" |
21 | | #include "clang/CodeGen/ConstantInitBuilder.h" |
22 | | #include "clang/AST/ASTContext.h" |
23 | | #include "clang/AST/Decl.h" |
24 | | #include "clang/AST/DeclObjC.h" |
25 | | #include "clang/AST/RecordLayout.h" |
26 | | #include "clang/AST/StmtObjC.h" |
27 | | #include "clang/Basic/FileManager.h" |
28 | | #include "clang/Basic/SourceManager.h" |
29 | | #include "llvm/ADT/SmallVector.h" |
30 | | #include "llvm/ADT/StringMap.h" |
31 | | #include "llvm/IR/CallSite.h" |
32 | | #include "llvm/IR/DataLayout.h" |
33 | | #include "llvm/IR/Intrinsics.h" |
34 | | #include "llvm/IR/LLVMContext.h" |
35 | | #include "llvm/IR/Module.h" |
36 | | #include "llvm/Support/Compiler.h" |
37 | | |
38 | | using namespace clang; |
39 | | using namespace CodeGen; |
40 | | |
41 | | namespace { |
42 | | /// Class that lazily initialises the runtime function. Avoids inserting the |
43 | | /// types and the function declaration into a module if they're not used, and |
44 | | /// avoids constructing the type more than once if it's used more than once. |
45 | | class LazyRuntimeFunction { |
46 | | CodeGenModule *CGM; |
47 | | llvm::FunctionType *FTy; |
48 | | const char *FunctionName; |
49 | | llvm::Constant *Function; |
50 | | |
51 | | public: |
52 | | /// Constructor leaves this class uninitialized, because it is intended to |
53 | | /// be used as a field in another class and not all of the types that are |
54 | | /// used as arguments will necessarily be available at construction time. |
55 | | LazyRuntimeFunction() |
56 | 489 | : CGM(nullptr), FunctionName(nullptr), Function(nullptr) {} |
57 | | |
58 | | /// Initialises the lazy function with the name, return type, and the types |
59 | | /// of the arguments. |
60 | | template <typename... Tys> |
61 | | void init(CodeGenModule *Mod, const char *name, llvm::Type *RetTy, |
62 | 317 | Tys *... Types) { |
63 | 317 | CGM = Mod; |
64 | 317 | FunctionName = name; |
65 | 317 | Function = nullptr; |
66 | 317 | if(sizeof...(Tys)317 ) { |
67 | 313 | SmallVector<llvm::Type *, 8> ArgTys({Types...}); |
68 | 313 | FTy = llvm::FunctionType::get(RetTy, ArgTys, false); |
69 | 313 | } |
70 | 4 | else { |
71 | 4 | FTy = llvm::FunctionType::get(RetTy, None, false); |
72 | 4 | } |
73 | 317 | } CGObjCGNU.cpp:void (anonymous namespace)::LazyRuntimeFunction::init<llvm::PointerType, llvm::PointerType, llvm::IntegerType, llvm::Type>(clang::CodeGen::CodeGenModule*, char const*, llvm::Type*, llvm::PointerType*, llvm::PointerType*, llvm::IntegerType*, llvm::Type*) Line | Count | Source | 62 | 23 | Tys *... Types) { | 63 | 23 | CGM = Mod; | 64 | 23 | FunctionName = name; | 65 | 23 | Function = nullptr; | 66 | 23 | if(sizeof...(Tys)23 ) { | 67 | 23 | SmallVector<llvm::Type *, 8> ArgTys({Types...}); | 68 | 23 | FTy = llvm::FunctionType::get(RetTy, ArgTys, false); | 69 | 23 | } | 70 | 0 | else { | 71 | 0 | FTy = llvm::FunctionType::get(RetTy, None, false); | 72 | 0 | } | 73 | 23 | } |
CGObjCGNU.cpp:void (anonymous namespace)::LazyRuntimeFunction::init<llvm::PointerType, llvm::PointerType, llvm::IntegerType, llvm::PointerType, llvm::Type, llvm::Type>(clang::CodeGen::CodeGenModule*, char const*, llvm::Type*, llvm::PointerType*, llvm::PointerType*, llvm::IntegerType*, llvm::PointerType*, llvm::Type*, llvm::Type*) Line | Count | Source | 62 | 23 | Tys *... Types) { | 63 | 23 | CGM = Mod; | 64 | 23 | FunctionName = name; | 65 | 23 | Function = nullptr; | 66 | 23 | if(sizeof...(Tys)23 ) { | 67 | 23 | SmallVector<llvm::Type *, 8> ArgTys({Types...}); | 68 | 23 | FTy = llvm::FunctionType::get(RetTy, ArgTys, false); | 69 | 23 | } | 70 | 0 | else { | 71 | 0 | FTy = llvm::FunctionType::get(RetTy, None, false); | 72 | 0 | } | 73 | 23 | } |
CGObjCGNU.cpp:void (anonymous namespace)::LazyRuntimeFunction::init<llvm::PointerType, llvm::PointerType, llvm::IntegerType, llvm::Type, llvm::Type>(clang::CodeGen::CodeGenModule*, char const*, llvm::Type*, llvm::PointerType*, llvm::PointerType*, llvm::IntegerType*, llvm::Type*, llvm::Type*) Line | Count | Source | 62 | 46 | Tys *... Types) { | 63 | 46 | CGM = Mod; | 64 | 46 | FunctionName = name; | 65 | 46 | Function = nullptr; | 66 | 46 | if(sizeof...(Tys)46 ) { | 67 | 46 | SmallVector<llvm::Type *, 8> ArgTys({Types...}); | 68 | 46 | FTy = llvm::FunctionType::get(RetTy, ArgTys, false); | 69 | 46 | } | 70 | 0 | else { | 71 | 0 | FTy = llvm::FunctionType::get(RetTy, None, false); | 72 | 0 | } | 73 | 46 | } |
Unexecuted instantiation: CGObjCGNU.cpp:void (anonymous namespace)::LazyRuntimeFunction::init<llvm::PointerType, llvm::PointerType, llvm::IntegerType>(clang::CodeGen::CodeGenModule*, char const*, llvm::Type*, llvm::PointerType*, llvm::PointerType*, llvm::IntegerType*) CGObjCGNU.cpp:void (anonymous namespace)::LazyRuntimeFunction::init<llvm::PointerType, llvm::PointerType, llvm::PointerType>(clang::CodeGen::CodeGenModule*, char const*, llvm::Type*, llvm::PointerType*, llvm::PointerType*, llvm::PointerType*) Line | Count | Source | 62 | 21 | Tys *... Types) { | 63 | 21 | CGM = Mod; | 64 | 21 | FunctionName = name; | 65 | 21 | Function = nullptr; | 66 | 21 | if(sizeof...(Tys)21 ) { | 67 | 21 | SmallVector<llvm::Type *, 8> ArgTys({Types...}); | 68 | 21 | FTy = llvm::FunctionType::get(RetTy, ArgTys, false); | 69 | 21 | } | 70 | 0 | else { | 71 | 0 | FTy = llvm::FunctionType::get(RetTy, None, false); | 72 | 0 | } | 73 | 21 | } |
CGObjCGNU.cpp:void (anonymous namespace)::LazyRuntimeFunction::init<llvm::PointerType, llvm::PointerType>(clang::CodeGen::CodeGenModule*, char const*, llvm::Type*, llvm::PointerType*, llvm::PointerType*) Line | Count | Source | 62 | 49 | Tys *... Types) { | 63 | 49 | CGM = Mod; | 64 | 49 | FunctionName = name; | 65 | 49 | Function = nullptr; | 66 | 49 | if(sizeof...(Tys)49 ) { | 67 | 49 | SmallVector<llvm::Type *, 8> ArgTys({Types...}); | 68 | 49 | FTy = llvm::FunctionType::get(RetTy, ArgTys, false); | 69 | 49 | } | 70 | 0 | else { | 71 | 0 | FTy = llvm::FunctionType::get(RetTy, None, false); | 72 | 0 | } | 73 | 49 | } |
CGObjCGNU.cpp:void (anonymous namespace)::LazyRuntimeFunction::init<llvm::PointerType>(clang::CodeGen::CodeGenModule*, char const*, llvm::Type*, llvm::PointerType*) Line | Count | Source | 62 | 123 | Tys *... Types) { | 63 | 123 | CGM = Mod; | 64 | 123 | FunctionName = name; | 65 | 123 | Function = nullptr; | 66 | 123 | if(sizeof...(Tys)123 ) { | 67 | 123 | SmallVector<llvm::Type *, 8> ArgTys({Types...}); | 68 | 123 | FTy = llvm::FunctionType::get(RetTy, ArgTys, false); | 69 | 123 | } | 70 | 0 | else { | 71 | 0 | FTy = llvm::FunctionType::get(RetTy, None, false); | 72 | 0 | } | 73 | 123 | } |
CGObjCGNU.cpp:void (anonymous namespace)::LazyRuntimeFunction::init<>(clang::CodeGen::CodeGenModule*, char const*, llvm::Type*) Line | Count | Source | 62 | 4 | Tys *... Types) { | 63 | 4 | CGM = Mod; | 64 | 4 | FunctionName = name; | 65 | 4 | Function = nullptr; | 66 | 4 | if(sizeof...(Tys)4 ) { | 67 | 0 | SmallVector<llvm::Type *, 8> ArgTys({Types...}); | 68 | 0 | FTy = llvm::FunctionType::get(RetTy, ArgTys, false); | 69 | 0 | } | 70 | 4 | else { | 71 | 4 | FTy = llvm::FunctionType::get(RetTy, None, false); | 72 | 4 | } | 73 | 4 | } |
CGObjCGNU.cpp:void (anonymous namespace)::LazyRuntimeFunction::init<llvm::PointerType, llvm::PointerType, llvm::PointerType, llvm::IntegerType>(clang::CodeGen::CodeGenModule*, char const*, llvm::Type*, llvm::PointerType*, llvm::PointerType*, llvm::PointerType*, llvm::IntegerType*) Line | Count | Source | 62 | 28 | Tys *... Types) { | 63 | 28 | CGM = Mod; | 64 | 28 | FunctionName = name; | 65 | 28 | Function = nullptr; | 66 | 28 | if(sizeof...(Tys)28 ) { | 67 | 28 | SmallVector<llvm::Type *, 8> ArgTys({Types...}); | 68 | 28 | FTy = llvm::FunctionType::get(RetTy, ArgTys, false); | 69 | 28 | } | 70 | 0 | else { | 71 | 0 | FTy = llvm::FunctionType::get(RetTy, None, false); | 72 | 0 | } | 73 | 28 | } |
|
74 | | |
75 | 0 | llvm::FunctionType *getType() { return FTy; } |
76 | | |
77 | | /// Overloaded cast operator, allows the class to be implicitly cast to an |
78 | | /// LLVM constant. |
79 | 49 | operator llvm::Constant *() { |
80 | 49 | if (!Function49 ) { |
81 | 33 | if (!FunctionName) |
82 | 6 | return nullptr; |
83 | 27 | Function = |
84 | 27 | cast<llvm::Constant>(CGM->CreateRuntimeFunction(FTy, FunctionName)); |
85 | 27 | } |
86 | 43 | return Function; |
87 | 49 | } |
88 | 7 | operator llvm::Function *() { |
89 | 7 | return cast<llvm::Function>((llvm::Constant *)*this); |
90 | 7 | } |
91 | | }; |
92 | | |
93 | | |
94 | | /// GNU Objective-C runtime code generation. This class implements the parts of |
95 | | /// Objective-C support that are specific to the GNU family of runtimes (GCC, |
96 | | /// GNUstep and ObjFW). |
97 | | class CGObjCGNU : public CGObjCRuntime { |
98 | | protected: |
99 | | /// The LLVM module into which output is inserted |
100 | | llvm::Module &TheModule; |
101 | | /// strut objc_super. Used for sending messages to super. This structure |
102 | | /// contains the receiver (object) and the expected class. |
103 | | llvm::StructType *ObjCSuperTy; |
104 | | /// struct objc_super*. The type of the argument to the superclass message |
105 | | /// lookup functions. |
106 | | llvm::PointerType *PtrToObjCSuperTy; |
107 | | /// LLVM type for selectors. Opaque pointer (i8*) unless a header declaring |
108 | | /// SEL is included in a header somewhere, in which case it will be whatever |
109 | | /// type is declared in that header, most likely {i8*, i8*}. |
110 | | llvm::PointerType *SelectorTy; |
111 | | /// LLVM i8 type. Cached here to avoid repeatedly getting it in all of the |
112 | | /// places where it's used |
113 | | llvm::IntegerType *Int8Ty; |
114 | | /// Pointer to i8 - LLVM type of char*, for all of the places where the |
115 | | /// runtime needs to deal with C strings. |
116 | | llvm::PointerType *PtrToInt8Ty; |
117 | | /// Instance Method Pointer type. This is a pointer to a function that takes, |
118 | | /// at a minimum, an object and a selector, and is the generic type for |
119 | | /// Objective-C methods. Due to differences between variadic / non-variadic |
120 | | /// calling conventions, it must always be cast to the correct type before |
121 | | /// actually being used. |
122 | | llvm::PointerType *IMPTy; |
123 | | /// Type of an untyped Objective-C object. Clang treats id as a built-in type |
124 | | /// when compiling Objective-C code, so this may be an opaque pointer (i8*), |
125 | | /// but if the runtime header declaring it is included then it may be a |
126 | | /// pointer to a structure. |
127 | | llvm::PointerType *IdTy; |
128 | | /// Pointer to a pointer to an Objective-C object. Used in the new ABI |
129 | | /// message lookup function and some GC-related functions. |
130 | | llvm::PointerType *PtrToIdTy; |
131 | | /// The clang type of id. Used when using the clang CGCall infrastructure to |
132 | | /// call Objective-C methods. |
133 | | CanQualType ASTIdTy; |
134 | | /// LLVM type for C int type. |
135 | | llvm::IntegerType *IntTy; |
136 | | /// LLVM type for an opaque pointer. This is identical to PtrToInt8Ty, but is |
137 | | /// used in the code to document the difference between i8* meaning a pointer |
138 | | /// to a C string and i8* meaning a pointer to some opaque type. |
139 | | llvm::PointerType *PtrTy; |
140 | | /// LLVM type for C long type. The runtime uses this in a lot of places where |
141 | | /// it should be using intptr_t, but we can't fix this without breaking |
142 | | /// compatibility with GCC... |
143 | | llvm::IntegerType *LongTy; |
144 | | /// LLVM type for C size_t. Used in various runtime data structures. |
145 | | llvm::IntegerType *SizeTy; |
146 | | /// LLVM type for C intptr_t. |
147 | | llvm::IntegerType *IntPtrTy; |
148 | | /// LLVM type for C ptrdiff_t. Mainly used in property accessor functions. |
149 | | llvm::IntegerType *PtrDiffTy; |
150 | | /// LLVM type for C int*. Used for GCC-ABI-compatible non-fragile instance |
151 | | /// variables. |
152 | | llvm::PointerType *PtrToIntTy; |
153 | | /// LLVM type for Objective-C BOOL type. |
154 | | llvm::Type *BoolTy; |
155 | | /// 32-bit integer type, to save us needing to look it up every time it's used. |
156 | | llvm::IntegerType *Int32Ty; |
157 | | /// 64-bit integer type, to save us needing to look it up every time it's used. |
158 | | llvm::IntegerType *Int64Ty; |
159 | | /// Metadata kind used to tie method lookups to message sends. The GNUstep |
160 | | /// runtime provides some LLVM passes that can use this to do things like |
161 | | /// automatic IMP caching and speculative inlining. |
162 | | unsigned msgSendMDKind; |
163 | | |
164 | | /// Helper function that generates a constant string and returns a pointer to |
165 | | /// the start of the string. The result of this function can be used anywhere |
166 | | /// where the C code specifies const char*. |
167 | 272 | llvm::Constant *MakeConstantString(StringRef Str, const char *Name = "") { |
168 | 272 | ConstantAddress Array = CGM.GetAddrOfConstantCString(Str, Name); |
169 | 272 | return llvm::ConstantExpr::getGetElementPtr(Array.getElementType(), |
170 | 272 | Array.getPointer(), Zeros); |
171 | 272 | } |
172 | | |
173 | | /// Emits a linkonce_odr string, whose name is the prefix followed by the |
174 | | /// string value. This allows the linker to combine the strings between |
175 | | /// different modules. Used for EH typeinfo names, selector strings, and a |
176 | | /// few other things. |
177 | 19 | llvm::Constant *ExportUniqueString(const std::string &Str, StringRef Prefix) { |
178 | 19 | std::string Name = Prefix.str() + Str; |
179 | 19 | auto *ConstStr = TheModule.getGlobalVariable(Name); |
180 | 19 | if (!ConstStr19 ) { |
181 | 19 | llvm::Constant *value = llvm::ConstantDataArray::getString(VMContext,Str); |
182 | 19 | ConstStr = new llvm::GlobalVariable(TheModule, value->getType(), true, |
183 | 19 | llvm::GlobalValue::LinkOnceODRLinkage, |
184 | 19 | value, Name); |
185 | 19 | } |
186 | 19 | return llvm::ConstantExpr::getGetElementPtr(ConstStr->getValueType(), |
187 | 19 | ConstStr, Zeros); |
188 | 19 | } |
189 | | |
190 | | /// Generates a global structure, initialized by the elements in the vector. |
191 | | /// The element types must match the types of the structure elements in the |
192 | | /// first argument. |
193 | | llvm::GlobalVariable *MakeGlobal(llvm::Constant *C, |
194 | | CharUnits Align, |
195 | | StringRef Name="", |
196 | | llvm::GlobalValue::LinkageTypes linkage |
197 | 0 | =llvm::GlobalValue::InternalLinkage) { |
198 | 0 | auto GV = new llvm::GlobalVariable(TheModule, C->getType(), false, |
199 | 0 | linkage, C, Name); |
200 | 0 | GV->setAlignment(Align.getQuantity()); |
201 | 0 | return GV; |
202 | 0 | } |
203 | | |
204 | | /// Returns a property name and encoding string. |
205 | | llvm::Constant *MakePropertyEncodingString(const ObjCPropertyDecl *PD, |
206 | 12 | const Decl *Container) { |
207 | 12 | const ObjCRuntime &R = CGM.getLangOpts().ObjCRuntime; |
208 | 12 | if ((R.getKind() == ObjCRuntime::GNUstep) && |
209 | 12 | (R.getVersion() >= VersionTuple(1, 6))8 ) { |
210 | 7 | std::string NameAndAttributes; |
211 | 7 | std::string TypeStr = |
212 | 7 | CGM.getContext().getObjCEncodingForPropertyDecl(PD, Container); |
213 | 7 | NameAndAttributes += '\0'; |
214 | 7 | NameAndAttributes += TypeStr.length() + 3; |
215 | 7 | NameAndAttributes += TypeStr; |
216 | 7 | NameAndAttributes += '\0'; |
217 | 7 | NameAndAttributes += PD->getNameAsString(); |
218 | 7 | return MakeConstantString(NameAndAttributes); |
219 | 7 | } |
220 | 5 | return MakeConstantString(PD->getNameAsString()); |
221 | 5 | } |
222 | | |
223 | | /// Push the property attributes into two structure fields. |
224 | | void PushPropertyAttributes(ConstantStructBuilder &Fields, |
225 | | ObjCPropertyDecl *property, bool isSynthesized=true, bool |
226 | 12 | isDynamic=true) { |
227 | 12 | int attrs = property->getPropertyAttributes(); |
228 | 12 | // For read-only properties, clear the copy and retain flags |
229 | 12 | if (attrs & ObjCPropertyDecl::OBJC_PR_readonly12 ) { |
230 | 1 | attrs &= ~ObjCPropertyDecl::OBJC_PR_copy; |
231 | 1 | attrs &= ~ObjCPropertyDecl::OBJC_PR_retain; |
232 | 1 | attrs &= ~ObjCPropertyDecl::OBJC_PR_weak; |
233 | 1 | attrs &= ~ObjCPropertyDecl::OBJC_PR_strong; |
234 | 1 | } |
235 | 12 | // The first flags field has the same attribute values as clang uses internally |
236 | 12 | Fields.addInt(Int8Ty, attrs & 0xff); |
237 | 12 | attrs >>= 8; |
238 | 12 | attrs <<= 2; |
239 | 12 | // For protocol properties, synthesized and dynamic have no meaning, so we |
240 | 12 | // reuse these flags to indicate that this is a protocol property (both set |
241 | 12 | // has no meaning, as a property can't be both synthesized and dynamic) |
242 | 12 | attrs |= isSynthesized ? (1<<0)11 : 01 ; |
243 | 12 | attrs |= isDynamic ? (1<<1)1 : 011 ; |
244 | 12 | // The second field is the next four fields left shifted by two, with the |
245 | 12 | // low bit set to indicate whether the field is synthesized or dynamic. |
246 | 12 | Fields.addInt(Int8Ty, attrs & 0xff); |
247 | 12 | // Two padding fields |
248 | 12 | Fields.addInt(Int8Ty, 0); |
249 | 12 | Fields.addInt(Int8Ty, 0); |
250 | 12 | } |
251 | | |
252 | | /// Ensures that the value has the required type, by inserting a bitcast if |
253 | | /// required. This function lets us avoid inserting bitcasts that are |
254 | | /// redundant. |
255 | 96 | llvm::Value* EnforceType(CGBuilderTy &B, llvm::Value *V, llvm::Type *Ty) { |
256 | 96 | if (V->getType() == Ty96 ) return V71 ; |
257 | 25 | return B.CreateBitCast(V, Ty); |
258 | 25 | } |
259 | 6 | Address EnforceType(CGBuilderTy &B, Address V, llvm::Type *Ty) { |
260 | 6 | if (V.getType() == Ty6 ) return V4 ; |
261 | 2 | return B.CreateBitCast(V, Ty); |
262 | 2 | } |
263 | | |
264 | | // Some zeros used for GEPs in lots of places. |
265 | | llvm::Constant *Zeros[2]; |
266 | | /// Null pointer value. Mainly used as a terminator in various arrays. |
267 | | llvm::Constant *NULLPtr; |
268 | | /// LLVM context. |
269 | | llvm::LLVMContext &VMContext; |
270 | | |
271 | | private: |
272 | | /// Placeholder for the class. Lots of things refer to the class before we've |
273 | | /// actually emitted it. We use this alias as a placeholder, and then replace |
274 | | /// it with a pointer to the class structure before finally emitting the |
275 | | /// module. |
276 | | llvm::GlobalAlias *ClassPtrAlias; |
277 | | /// Placeholder for the metaclass. Lots of things refer to the class before |
278 | | /// we've / actually emitted it. We use this alias as a placeholder, and then |
279 | | /// replace / it with a pointer to the metaclass structure before finally |
280 | | /// emitting the / module. |
281 | | llvm::GlobalAlias *MetaClassPtrAlias; |
282 | | /// All of the classes that have been generated for this compilation units. |
283 | | std::vector<llvm::Constant*> Classes; |
284 | | /// All of the categories that have been generated for this compilation units. |
285 | | std::vector<llvm::Constant*> Categories; |
286 | | /// All of the Objective-C constant strings that have been generated for this |
287 | | /// compilation units. |
288 | | std::vector<llvm::Constant*> ConstantStrings; |
289 | | /// Map from string values to Objective-C constant strings in the output. |
290 | | /// Used to prevent emitting Objective-C strings more than once. This should |
291 | | /// not be required at all - CodeGenModule should manage this list. |
292 | | llvm::StringMap<llvm::Constant*> ObjCStrings; |
293 | | /// All of the protocols that have been declared. |
294 | | llvm::StringMap<llvm::Constant*> ExistingProtocols; |
295 | | /// For each variant of a selector, we store the type encoding and a |
296 | | /// placeholder value. For an untyped selector, the type will be the empty |
297 | | /// string. Selector references are all done via the module's selector table, |
298 | | /// so we create an alias as a placeholder and then replace it with the real |
299 | | /// value later. |
300 | | typedef std::pair<std::string, llvm::GlobalAlias*> TypedSelector; |
301 | | /// Type of the selector map. This is roughly equivalent to the structure |
302 | | /// used in the GNUstep runtime, which maintains a list of all of the valid |
303 | | /// types for a selector in a table. |
304 | | typedef llvm::DenseMap<Selector, SmallVector<TypedSelector, 2> > |
305 | | SelectorMap; |
306 | | /// A map from selectors to selector types. This allows us to emit all |
307 | | /// selectors of the same name and type together. |
308 | | SelectorMap SelectorTable; |
309 | | |
310 | | /// Selectors related to memory management. When compiling in GC mode, we |
311 | | /// omit these. |
312 | | Selector RetainSel, ReleaseSel, AutoreleaseSel; |
313 | | /// Runtime functions used for memory management in GC mode. Note that clang |
314 | | /// supports code generation for calling these functions, but neither GNU |
315 | | /// runtime actually supports this API properly yet. |
316 | | LazyRuntimeFunction IvarAssignFn, StrongCastAssignFn, MemMoveFn, WeakReadFn, |
317 | | WeakAssignFn, GlobalAssignFn; |
318 | | |
319 | | typedef std::pair<std::string, std::string> ClassAliasPair; |
320 | | /// All classes that have aliases set for them. |
321 | | std::vector<ClassAliasPair> ClassAliases; |
322 | | |
323 | | protected: |
324 | | /// Function used for throwing Objective-C exceptions. |
325 | | LazyRuntimeFunction ExceptionThrowFn; |
326 | | /// Function used for rethrowing exceptions, used at the end of \@finally or |
327 | | /// \@synchronize blocks. |
328 | | LazyRuntimeFunction ExceptionReThrowFn; |
329 | | /// Function called when entering a catch function. This is required for |
330 | | /// differentiating Objective-C exceptions and foreign exceptions. |
331 | | LazyRuntimeFunction EnterCatchFn; |
332 | | /// Function called when exiting from a catch block. Used to do exception |
333 | | /// cleanup. |
334 | | LazyRuntimeFunction ExitCatchFn; |
335 | | /// Function called when entering an \@synchronize block. Acquires the lock. |
336 | | LazyRuntimeFunction SyncEnterFn; |
337 | | /// Function called when exiting an \@synchronize block. Releases the lock. |
338 | | LazyRuntimeFunction SyncExitFn; |
339 | | |
340 | | private: |
341 | | /// Function called if fast enumeration detects that the collection is |
342 | | /// modified during the update. |
343 | | LazyRuntimeFunction EnumerationMutationFn; |
344 | | /// Function for implementing synthesized property getters that return an |
345 | | /// object. |
346 | | LazyRuntimeFunction GetPropertyFn; |
347 | | /// Function for implementing synthesized property setters that return an |
348 | | /// object. |
349 | | LazyRuntimeFunction SetPropertyFn; |
350 | | /// Function used for non-object declared property getters. |
351 | | LazyRuntimeFunction GetStructPropertyFn; |
352 | | /// Function used for non-object declared property setters. |
353 | | LazyRuntimeFunction SetStructPropertyFn; |
354 | | |
355 | | /// The version of the runtime that this class targets. Must match the |
356 | | /// version in the runtime. |
357 | | int RuntimeVersion; |
358 | | /// The version of the protocol class. Used to differentiate between ObjC1 |
359 | | /// and ObjC2 protocols. Objective-C 1 protocols can not contain optional |
360 | | /// components and can not contain declared properties. We always emit |
361 | | /// Objective-C 2 property structures, but we have to pretend that they're |
362 | | /// Objective-C 1 property structures when targeting the GCC runtime or it |
363 | | /// will abort. |
364 | | const int ProtocolVersion; |
365 | | |
366 | | /// Generates an instance variable list structure. This is a structure |
367 | | /// containing a size and an array of structures containing instance variable |
368 | | /// metadata. This is used purely for introspection in the fragile ABI. In |
369 | | /// the non-fragile ABI, it's used for instance variable fixup. |
370 | | llvm::Constant *GenerateIvarList(ArrayRef<llvm::Constant *> IvarNames, |
371 | | ArrayRef<llvm::Constant *> IvarTypes, |
372 | | ArrayRef<llvm::Constant *> IvarOffsets); |
373 | | |
374 | | /// Generates a method list structure. This is a structure containing a size |
375 | | /// and an array of structures containing method metadata. |
376 | | /// |
377 | | /// This structure is used by both classes and categories, and contains a next |
378 | | /// pointer allowing them to be chained together in a linked list. |
379 | | llvm::Constant *GenerateMethodList(StringRef ClassName, |
380 | | StringRef CategoryName, |
381 | | ArrayRef<Selector> MethodSels, |
382 | | ArrayRef<llvm::Constant *> MethodTypes, |
383 | | bool isClassMethodList); |
384 | | |
385 | | /// Emits an empty protocol. This is used for \@protocol() where no protocol |
386 | | /// is found. The runtime will (hopefully) fix up the pointer to refer to the |
387 | | /// real protocol. |
388 | | llvm::Constant *GenerateEmptyProtocol(const std::string &ProtocolName); |
389 | | |
390 | | /// Generates a list of property metadata structures. This follows the same |
391 | | /// pattern as method and instance variable metadata lists. |
392 | | llvm::Constant *GeneratePropertyList(const ObjCImplementationDecl *OID, |
393 | | SmallVectorImpl<Selector> &InstanceMethodSels, |
394 | | SmallVectorImpl<llvm::Constant*> &InstanceMethodTypes); |
395 | | |
396 | | /// Generates a list of referenced protocols. Classes, categories, and |
397 | | /// protocols all use this structure. |
398 | | llvm::Constant *GenerateProtocolList(ArrayRef<std::string> Protocols); |
399 | | |
400 | | /// To ensure that all protocols are seen by the runtime, we add a category on |
401 | | /// a class defined in the runtime, declaring no methods, but adopting the |
402 | | /// protocols. This is a horribly ugly hack, but it allows us to collect all |
403 | | /// of the protocols without changing the ABI. |
404 | | void GenerateProtocolHolderCategory(); |
405 | | |
406 | | /// Generates a class structure. |
407 | | llvm::Constant *GenerateClassStructure( |
408 | | llvm::Constant *MetaClass, |
409 | | llvm::Constant *SuperClass, |
410 | | unsigned info, |
411 | | const char *Name, |
412 | | llvm::Constant *Version, |
413 | | llvm::Constant *InstanceSize, |
414 | | llvm::Constant *IVars, |
415 | | llvm::Constant *Methods, |
416 | | llvm::Constant *Protocols, |
417 | | llvm::Constant *IvarOffsets, |
418 | | llvm::Constant *Properties, |
419 | | llvm::Constant *StrongIvarBitmap, |
420 | | llvm::Constant *WeakIvarBitmap, |
421 | | bool isMeta=false); |
422 | | |
423 | | /// Generates a method list. This is used by protocols to define the required |
424 | | /// and optional methods. |
425 | | llvm::Constant *GenerateProtocolMethodList( |
426 | | ArrayRef<llvm::Constant *> MethodNames, |
427 | | ArrayRef<llvm::Constant *> MethodTypes); |
428 | | |
429 | | /// Returns a selector with the specified type encoding. An empty string is |
430 | | /// used to return an untyped selector (with the types field set to NULL). |
431 | | llvm::Value *GetSelector(CodeGenFunction &CGF, Selector Sel, |
432 | | const std::string &TypeEncoding); |
433 | | |
434 | | /// Returns the variable used to store the offset of an instance variable. |
435 | | llvm::GlobalVariable *ObjCIvarOffsetVariable(const ObjCInterfaceDecl *ID, |
436 | | const ObjCIvarDecl *Ivar); |
437 | | /// Emits a reference to a class. This allows the linker to object if there |
438 | | /// is no class of the matching name. |
439 | | |
440 | | protected: |
441 | | void EmitClassRef(const std::string &className); |
442 | | |
443 | | /// Emits a pointer to the named class |
444 | | virtual llvm::Value *GetClassNamed(CodeGenFunction &CGF, |
445 | | const std::string &Name, bool isWeak); |
446 | | |
447 | | /// Looks up the method for sending a message to the specified object. This |
448 | | /// mechanism differs between the GCC and GNU runtimes, so this method must be |
449 | | /// overridden in subclasses. |
450 | | virtual llvm::Value *LookupIMP(CodeGenFunction &CGF, |
451 | | llvm::Value *&Receiver, |
452 | | llvm::Value *cmd, |
453 | | llvm::MDNode *node, |
454 | | MessageSendInfo &MSI) = 0; |
455 | | |
456 | | /// Looks up the method for sending a message to a superclass. This |
457 | | /// mechanism differs between the GCC and GNU runtimes, so this method must |
458 | | /// be overridden in subclasses. |
459 | | virtual llvm::Value *LookupIMPSuper(CodeGenFunction &CGF, |
460 | | Address ObjCSuper, |
461 | | llvm::Value *cmd, |
462 | | MessageSendInfo &MSI) = 0; |
463 | | |
464 | | /// Libobjc2 uses a bitfield representation where small(ish) bitfields are |
465 | | /// stored in a 64-bit value with the low bit set to 1 and the remaining 63 |
466 | | /// bits set to their values, LSB first, while larger ones are stored in a |
467 | | /// structure of this / form: |
468 | | /// |
469 | | /// struct { int32_t length; int32_t values[length]; }; |
470 | | /// |
471 | | /// The values in the array are stored in host-endian format, with the least |
472 | | /// significant bit being assumed to come first in the bitfield. Therefore, |
473 | | /// a bitfield with the 64th bit set will be (int64_t)&{ 2, [0, 1<<31] }, |
474 | | /// while a bitfield / with the 63rd bit set will be 1<<64. |
475 | | llvm::Constant *MakeBitField(ArrayRef<bool> bits); |
476 | | |
477 | | public: |
478 | | CGObjCGNU(CodeGenModule &cgm, unsigned runtimeABIVersion, |
479 | | unsigned protocolClassVersion); |
480 | | |
481 | | ConstantAddress GenerateConstantString(const StringLiteral *) override; |
482 | | |
483 | | RValue |
484 | | GenerateMessageSend(CodeGenFunction &CGF, ReturnValueSlot Return, |
485 | | QualType ResultType, Selector Sel, |
486 | | llvm::Value *Receiver, const CallArgList &CallArgs, |
487 | | const ObjCInterfaceDecl *Class, |
488 | | const ObjCMethodDecl *Method) override; |
489 | | RValue |
490 | | GenerateMessageSendSuper(CodeGenFunction &CGF, ReturnValueSlot Return, |
491 | | QualType ResultType, Selector Sel, |
492 | | const ObjCInterfaceDecl *Class, |
493 | | bool isCategoryImpl, llvm::Value *Receiver, |
494 | | bool IsClassMessage, const CallArgList &CallArgs, |
495 | | const ObjCMethodDecl *Method) override; |
496 | | llvm::Value *GetClass(CodeGenFunction &CGF, |
497 | | const ObjCInterfaceDecl *OID) override; |
498 | | llvm::Value *GetSelector(CodeGenFunction &CGF, Selector Sel) override; |
499 | | Address GetAddrOfSelector(CodeGenFunction &CGF, Selector Sel) override; |
500 | | llvm::Value *GetSelector(CodeGenFunction &CGF, |
501 | | const ObjCMethodDecl *Method) override; |
502 | | llvm::Constant *GetEHType(QualType T) override; |
503 | | |
504 | | llvm::Function *GenerateMethod(const ObjCMethodDecl *OMD, |
505 | | const ObjCContainerDecl *CD) override; |
506 | | void GenerateCategory(const ObjCCategoryImplDecl *CMD) override; |
507 | | void GenerateClass(const ObjCImplementationDecl *ClassDecl) override; |
508 | | void RegisterAlias(const ObjCCompatibleAliasDecl *OAD) override; |
509 | | llvm::Value *GenerateProtocolRef(CodeGenFunction &CGF, |
510 | | const ObjCProtocolDecl *PD) override; |
511 | | void GenerateProtocol(const ObjCProtocolDecl *PD) override; |
512 | | llvm::Function *ModuleInitFunction() override; |
513 | | llvm::Constant *GetPropertyGetFunction() override; |
514 | | llvm::Constant *GetPropertySetFunction() override; |
515 | | llvm::Constant *GetOptimizedPropertySetFunction(bool atomic, |
516 | | bool copy) override; |
517 | | llvm::Constant *GetSetStructFunction() override; |
518 | | llvm::Constant *GetGetStructFunction() override; |
519 | | llvm::Constant *GetCppAtomicObjectGetFunction() override; |
520 | | llvm::Constant *GetCppAtomicObjectSetFunction() override; |
521 | | llvm::Constant *EnumerationMutationFunction() override; |
522 | | |
523 | | void EmitTryStmt(CodeGenFunction &CGF, |
524 | | const ObjCAtTryStmt &S) override; |
525 | | void EmitSynchronizedStmt(CodeGenFunction &CGF, |
526 | | const ObjCAtSynchronizedStmt &S) override; |
527 | | void EmitThrowStmt(CodeGenFunction &CGF, |
528 | | const ObjCAtThrowStmt &S, |
529 | | bool ClearInsertionPoint=true) override; |
530 | | llvm::Value * EmitObjCWeakRead(CodeGenFunction &CGF, |
531 | | Address AddrWeakObj) override; |
532 | | void EmitObjCWeakAssign(CodeGenFunction &CGF, |
533 | | llvm::Value *src, Address dst) override; |
534 | | void EmitObjCGlobalAssign(CodeGenFunction &CGF, |
535 | | llvm::Value *src, Address dest, |
536 | | bool threadlocal=false) override; |
537 | | void EmitObjCIvarAssign(CodeGenFunction &CGF, llvm::Value *src, |
538 | | Address dest, llvm::Value *ivarOffset) override; |
539 | | void EmitObjCStrongCastAssign(CodeGenFunction &CGF, |
540 | | llvm::Value *src, Address dest) override; |
541 | | void EmitGCMemmoveCollectable(CodeGenFunction &CGF, Address DestPtr, |
542 | | Address SrcPtr, |
543 | | llvm::Value *Size) override; |
544 | | LValue EmitObjCValueForIvar(CodeGenFunction &CGF, QualType ObjectTy, |
545 | | llvm::Value *BaseValue, const ObjCIvarDecl *Ivar, |
546 | | unsigned CVRQualifiers) override; |
547 | | llvm::Value *EmitIvarOffset(CodeGenFunction &CGF, |
548 | | const ObjCInterfaceDecl *Interface, |
549 | | const ObjCIvarDecl *Ivar) override; |
550 | | llvm::Value *EmitNSAutoreleasePoolClassRef(CodeGenFunction &CGF) override; |
551 | | llvm::Constant *BuildGCBlockLayout(CodeGenModule &CGM, |
552 | 0 | const CGBlockInfo &blockInfo) override { |
553 | 0 | return NULLPtr; |
554 | 0 | } |
555 | | llvm::Constant *BuildRCBlockLayout(CodeGenModule &CGM, |
556 | 0 | const CGBlockInfo &blockInfo) override { |
557 | 0 | return NULLPtr; |
558 | 0 | } |
559 | | |
560 | 0 | llvm::Constant *BuildByrefLayout(CodeGenModule &CGM, QualType T) override { |
561 | 0 | return NULLPtr; |
562 | 0 | } |
563 | | }; |
564 | | |
565 | | /// Class representing the legacy GCC Objective-C ABI. This is the default when |
566 | | /// -fobjc-nonfragile-abi is not specified. |
567 | | /// |
568 | | /// The GCC ABI target actually generates code that is approximately compatible |
569 | | /// with the new GNUstep runtime ABI, but refrains from using any features that |
570 | | /// would not work with the GCC runtime. For example, clang always generates |
571 | | /// the extended form of the class structure, and the extra fields are simply |
572 | | /// ignored by GCC libobjc. |
573 | | class CGObjCGCC : public CGObjCGNU { |
574 | | /// The GCC ABI message lookup function. Returns an IMP pointing to the |
575 | | /// method implementation for this message. |
576 | | LazyRuntimeFunction MsgLookupFn; |
577 | | /// The GCC ABI superclass message lookup function. Takes a pointer to a |
578 | | /// structure describing the receiver and the class, and a selector as |
579 | | /// arguments. Returns the IMP for the corresponding method. |
580 | | LazyRuntimeFunction MsgLookupSuperFn; |
581 | | |
582 | | protected: |
583 | | llvm::Value *LookupIMP(CodeGenFunction &CGF, llvm::Value *&Receiver, |
584 | | llvm::Value *cmd, llvm::MDNode *node, |
585 | 9 | MessageSendInfo &MSI) override { |
586 | 9 | CGBuilderTy &Builder = CGF.Builder; |
587 | 9 | llvm::Value *args[] = { |
588 | 9 | EnforceType(Builder, Receiver, IdTy), |
589 | 9 | EnforceType(Builder, cmd, SelectorTy) }; |
590 | 9 | llvm::CallSite imp = CGF.EmitRuntimeCallOrInvoke(MsgLookupFn, args); |
591 | 9 | imp->setMetadata(msgSendMDKind, node); |
592 | 9 | return imp.getInstruction(); |
593 | 9 | } |
594 | | |
595 | | llvm::Value *LookupIMPSuper(CodeGenFunction &CGF, Address ObjCSuper, |
596 | 3 | llvm::Value *cmd, MessageSendInfo &MSI) override { |
597 | 3 | CGBuilderTy &Builder = CGF.Builder; |
598 | 3 | llvm::Value *lookupArgs[] = {EnforceType(Builder, ObjCSuper, |
599 | 3 | PtrToObjCSuperTy).getPointer(), cmd}; |
600 | 3 | return CGF.EmitNounwindRuntimeCall(MsgLookupSuperFn, lookupArgs); |
601 | 3 | } |
602 | | |
603 | | public: |
604 | 11 | CGObjCGCC(CodeGenModule &Mod) : CGObjCGNU(Mod, 8, 2) { |
605 | 11 | // IMP objc_msg_lookup(id, SEL); |
606 | 11 | MsgLookupFn.init(&CGM, "objc_msg_lookup", IMPTy, IdTy, SelectorTy); |
607 | 11 | // IMP objc_msg_lookup_super(struct objc_super*, SEL); |
608 | 11 | MsgLookupSuperFn.init(&CGM, "objc_msg_lookup_super", IMPTy, |
609 | 11 | PtrToObjCSuperTy, SelectorTy); |
610 | 11 | } |
611 | | }; |
612 | | |
613 | | /// Class used when targeting the new GNUstep runtime ABI. |
614 | | class CGObjCGNUstep : public CGObjCGNU { |
615 | | /// The slot lookup function. Returns a pointer to a cacheable structure |
616 | | /// that contains (among other things) the IMP. |
617 | | LazyRuntimeFunction SlotLookupFn; |
618 | | /// The GNUstep ABI superclass message lookup function. Takes a pointer to |
619 | | /// a structure describing the receiver and the class, and a selector as |
620 | | /// arguments. Returns the slot for the corresponding method. Superclass |
621 | | /// message lookup rarely changes, so this is a good caching opportunity. |
622 | | LazyRuntimeFunction SlotLookupSuperFn; |
623 | | /// Specialised function for setting atomic retain properties |
624 | | LazyRuntimeFunction SetPropertyAtomic; |
625 | | /// Specialised function for setting atomic copy properties |
626 | | LazyRuntimeFunction SetPropertyAtomicCopy; |
627 | | /// Specialised function for setting nonatomic retain properties |
628 | | LazyRuntimeFunction SetPropertyNonAtomic; |
629 | | /// Specialised function for setting nonatomic copy properties |
630 | | LazyRuntimeFunction SetPropertyNonAtomicCopy; |
631 | | /// Function to perform atomic copies of C++ objects with nontrivial copy |
632 | | /// constructors from Objective-C ivars. |
633 | | LazyRuntimeFunction CxxAtomicObjectGetFn; |
634 | | /// Function to perform atomic copies of C++ objects with nontrivial copy |
635 | | /// constructors to Objective-C ivars. |
636 | | LazyRuntimeFunction CxxAtomicObjectSetFn; |
637 | | /// Type of an slot structure pointer. This is returned by the various |
638 | | /// lookup functions. |
639 | | llvm::Type *SlotTy; |
640 | | |
641 | | public: |
642 | | llvm::Constant *GetEHType(QualType T) override; |
643 | | |
644 | | protected: |
645 | | llvm::Value *LookupIMP(CodeGenFunction &CGF, llvm::Value *&Receiver, |
646 | | llvm::Value *cmd, llvm::MDNode *node, |
647 | 5 | MessageSendInfo &MSI) override { |
648 | 5 | CGBuilderTy &Builder = CGF.Builder; |
649 | 5 | llvm::Function *LookupFn = SlotLookupFn; |
650 | 5 | |
651 | 5 | // Store the receiver on the stack so that we can reload it later |
652 | 5 | Address ReceiverPtr = |
653 | 5 | CGF.CreateTempAlloca(Receiver->getType(), CGF.getPointerAlign()); |
654 | 5 | Builder.CreateStore(Receiver, ReceiverPtr); |
655 | 5 | |
656 | 5 | llvm::Value *self; |
657 | 5 | |
658 | 5 | if (isa<ObjCMethodDecl>(CGF.CurCodeDecl)5 ) { |
659 | 0 | self = CGF.LoadObjCSelf(); |
660 | 5 | } else { |
661 | 5 | self = llvm::ConstantPointerNull::get(IdTy); |
662 | 5 | } |
663 | 5 | |
664 | 5 | // The lookup function is guaranteed not to capture the receiver pointer. |
665 | 5 | LookupFn->addParamAttr(0, llvm::Attribute::NoCapture); |
666 | 5 | |
667 | 5 | llvm::Value *args[] = { |
668 | 5 | EnforceType(Builder, ReceiverPtr.getPointer(), PtrToIdTy), |
669 | 5 | EnforceType(Builder, cmd, SelectorTy), |
670 | 5 | EnforceType(Builder, self, IdTy) }; |
671 | 5 | llvm::CallSite slot = CGF.EmitRuntimeCallOrInvoke(LookupFn, args); |
672 | 5 | slot.setOnlyReadsMemory(); |
673 | 5 | slot->setMetadata(msgSendMDKind, node); |
674 | 5 | |
675 | 5 | // Load the imp from the slot |
676 | 5 | llvm::Value *imp = Builder.CreateAlignedLoad( |
677 | 5 | Builder.CreateStructGEP(nullptr, slot.getInstruction(), 4), |
678 | 5 | CGF.getPointerAlign()); |
679 | 5 | |
680 | 5 | // The lookup function may have changed the receiver, so make sure we use |
681 | 5 | // the new one. |
682 | 5 | Receiver = Builder.CreateLoad(ReceiverPtr, true); |
683 | 5 | return imp; |
684 | 5 | } |
685 | | |
686 | | llvm::Value *LookupIMPSuper(CodeGenFunction &CGF, Address ObjCSuper, |
687 | | llvm::Value *cmd, |
688 | 0 | MessageSendInfo &MSI) override { |
689 | 0 | CGBuilderTy &Builder = CGF.Builder; |
690 | 0 | llvm::Value *lookupArgs[] = {ObjCSuper.getPointer(), cmd}; |
691 | 0 |
|
692 | 0 | llvm::CallInst *slot = |
693 | 0 | CGF.EmitNounwindRuntimeCall(SlotLookupSuperFn, lookupArgs); |
694 | 0 | slot->setOnlyReadsMemory(); |
695 | 0 |
|
696 | 0 | return Builder.CreateAlignedLoad(Builder.CreateStructGEP(nullptr, slot, 4), |
697 | 0 | CGF.getPointerAlign()); |
698 | 0 | } |
699 | | |
700 | | public: |
701 | 7 | CGObjCGNUstep(CodeGenModule &Mod) : CGObjCGNU(Mod, 9, 3) { |
702 | 7 | const ObjCRuntime &R = CGM.getLangOpts().ObjCRuntime; |
703 | 7 | |
704 | 7 | llvm::StructType *SlotStructTy = |
705 | 7 | llvm::StructType::get(PtrTy, PtrTy, PtrTy, IntTy, IMPTy); |
706 | 7 | SlotTy = llvm::PointerType::getUnqual(SlotStructTy); |
707 | 7 | // Slot_t objc_msg_lookup_sender(id *receiver, SEL selector, id sender); |
708 | 7 | SlotLookupFn.init(&CGM, "objc_msg_lookup_sender", SlotTy, PtrToIdTy, |
709 | 7 | SelectorTy, IdTy); |
710 | 7 | // Slot_t objc_msg_lookup_super(struct objc_super*, SEL); |
711 | 7 | SlotLookupSuperFn.init(&CGM, "objc_slot_lookup_super", SlotTy, |
712 | 7 | PtrToObjCSuperTy, SelectorTy); |
713 | 7 | // If we're in ObjC++ mode, then we want to make |
714 | 7 | if (CGM.getLangOpts().CPlusPlus7 ) { |
715 | 2 | llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext); |
716 | 2 | // void *__cxa_begin_catch(void *e) |
717 | 2 | EnterCatchFn.init(&CGM, "__cxa_begin_catch", PtrTy, PtrTy); |
718 | 2 | // void __cxa_end_catch(void) |
719 | 2 | ExitCatchFn.init(&CGM, "__cxa_end_catch", VoidTy); |
720 | 2 | // void _Unwind_Resume_or_Rethrow(void*) |
721 | 2 | ExceptionReThrowFn.init(&CGM, "_Unwind_Resume_or_Rethrow", VoidTy, |
722 | 2 | PtrTy); |
723 | 7 | } else if (5 R.getVersion() >= VersionTuple(1, 7)5 ) { |
724 | 2 | llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext); |
725 | 2 | // id objc_begin_catch(void *e) |
726 | 2 | EnterCatchFn.init(&CGM, "objc_begin_catch", IdTy, PtrTy); |
727 | 2 | // void objc_end_catch(void) |
728 | 2 | ExitCatchFn.init(&CGM, "objc_end_catch", VoidTy); |
729 | 2 | // void _Unwind_Resume_or_Rethrow(void*) |
730 | 2 | ExceptionReThrowFn.init(&CGM, "objc_exception_rethrow", VoidTy, PtrTy); |
731 | 2 | } |
732 | 7 | llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext); |
733 | 7 | SetPropertyAtomic.init(&CGM, "objc_setProperty_atomic", VoidTy, IdTy, |
734 | 7 | SelectorTy, IdTy, PtrDiffTy); |
735 | 7 | SetPropertyAtomicCopy.init(&CGM, "objc_setProperty_atomic_copy", VoidTy, |
736 | 7 | IdTy, SelectorTy, IdTy, PtrDiffTy); |
737 | 7 | SetPropertyNonAtomic.init(&CGM, "objc_setProperty_nonatomic", VoidTy, |
738 | 7 | IdTy, SelectorTy, IdTy, PtrDiffTy); |
739 | 7 | SetPropertyNonAtomicCopy.init(&CGM, "objc_setProperty_nonatomic_copy", |
740 | 7 | VoidTy, IdTy, SelectorTy, IdTy, PtrDiffTy); |
741 | 7 | // void objc_setCppObjectAtomic(void *dest, const void *src, void |
742 | 7 | // *helper); |
743 | 7 | CxxAtomicObjectSetFn.init(&CGM, "objc_setCppObjectAtomic", VoidTy, PtrTy, |
744 | 7 | PtrTy, PtrTy); |
745 | 7 | // void objc_getCppObjectAtomic(void *dest, const void *src, void |
746 | 7 | // *helper); |
747 | 7 | CxxAtomicObjectGetFn.init(&CGM, "objc_getCppObjectAtomic", VoidTy, PtrTy, |
748 | 7 | PtrTy, PtrTy); |
749 | 7 | } |
750 | | |
751 | 2 | llvm::Constant *GetCppAtomicObjectGetFunction() override { |
752 | 2 | // The optimised functions were added in version 1.7 of the GNUstep |
753 | 2 | // runtime. |
754 | 2 | assert (CGM.getLangOpts().ObjCRuntime.getVersion() >= |
755 | 2 | VersionTuple(1, 7)); |
756 | 2 | return CxxAtomicObjectGetFn; |
757 | 2 | } |
758 | | |
759 | 2 | llvm::Constant *GetCppAtomicObjectSetFunction() override { |
760 | 2 | // The optimised functions were added in version 1.7 of the GNUstep |
761 | 2 | // runtime. |
762 | 2 | assert (CGM.getLangOpts().ObjCRuntime.getVersion() >= |
763 | 2 | VersionTuple(1, 7)); |
764 | 2 | return CxxAtomicObjectSetFn; |
765 | 2 | } |
766 | | |
767 | | llvm::Constant *GetOptimizedPropertySetFunction(bool atomic, |
768 | 4 | bool copy) override { |
769 | 4 | // The optimised property functions omit the GC check, and so are not |
770 | 4 | // safe to use in GC mode. The standard functions are fast in GC mode, |
771 | 4 | // so there is less advantage in using them. |
772 | 4 | assert ((CGM.getLangOpts().getGC() == LangOptions::NonGC)); |
773 | 4 | // The optimised functions were added in version 1.7 of the GNUstep |
774 | 4 | // runtime. |
775 | 4 | assert (CGM.getLangOpts().ObjCRuntime.getVersion() >= |
776 | 4 | VersionTuple(1, 7)); |
777 | 4 | |
778 | 4 | if (atomic4 ) { |
779 | 2 | if (copy2 ) return SetPropertyAtomicCopy1 ; |
780 | 1 | return SetPropertyAtomic; |
781 | 1 | } |
782 | 2 | |
783 | 2 | return copy ? 2 SetPropertyNonAtomicCopy1 : SetPropertyNonAtomic1 ; |
784 | 4 | } |
785 | | }; |
786 | | |
787 | | /// Support for the ObjFW runtime. |
788 | | class CGObjCObjFW: public CGObjCGNU { |
789 | | protected: |
790 | | /// The GCC ABI message lookup function. Returns an IMP pointing to the |
791 | | /// method implementation for this message. |
792 | | LazyRuntimeFunction MsgLookupFn; |
793 | | /// stret lookup function. While this does not seem to make sense at the |
794 | | /// first look, this is required to call the correct forwarding function. |
795 | | LazyRuntimeFunction MsgLookupFnSRet; |
796 | | /// The GCC ABI superclass message lookup function. Takes a pointer to a |
797 | | /// structure describing the receiver and the class, and a selector as |
798 | | /// arguments. Returns the IMP for the corresponding method. |
799 | | LazyRuntimeFunction MsgLookupSuperFn, MsgLookupSuperFnSRet; |
800 | | |
801 | | llvm::Value *LookupIMP(CodeGenFunction &CGF, llvm::Value *&Receiver, |
802 | | llvm::Value *cmd, llvm::MDNode *node, |
803 | 3 | MessageSendInfo &MSI) override { |
804 | 3 | CGBuilderTy &Builder = CGF.Builder; |
805 | 3 | llvm::Value *args[] = { |
806 | 3 | EnforceType(Builder, Receiver, IdTy), |
807 | 3 | EnforceType(Builder, cmd, SelectorTy) }; |
808 | 3 | |
809 | 3 | llvm::CallSite imp; |
810 | 3 | if (CGM.ReturnTypeUsesSRet(MSI.CallInfo)) |
811 | 1 | imp = CGF.EmitRuntimeCallOrInvoke(MsgLookupFnSRet, args); |
812 | 3 | else |
813 | 2 | imp = CGF.EmitRuntimeCallOrInvoke(MsgLookupFn, args); |
814 | 3 | |
815 | 3 | imp->setMetadata(msgSendMDKind, node); |
816 | 3 | return imp.getInstruction(); |
817 | 3 | } |
818 | | |
819 | | llvm::Value *LookupIMPSuper(CodeGenFunction &CGF, Address ObjCSuper, |
820 | 0 | llvm::Value *cmd, MessageSendInfo &MSI) override { |
821 | 0 | CGBuilderTy &Builder = CGF.Builder; |
822 | 0 | llvm::Value *lookupArgs[] = { |
823 | 0 | EnforceType(Builder, ObjCSuper.getPointer(), PtrToObjCSuperTy), cmd, |
824 | 0 | }; |
825 | 0 |
|
826 | 0 | if (CGM.ReturnTypeUsesSRet(MSI.CallInfo)) |
827 | 0 | return CGF.EmitNounwindRuntimeCall(MsgLookupSuperFnSRet, lookupArgs); |
828 | 0 | else |
829 | 0 | return CGF.EmitNounwindRuntimeCall(MsgLookupSuperFn, lookupArgs); |
830 | 0 | } |
831 | | |
832 | | llvm::Value *GetClassNamed(CodeGenFunction &CGF, const std::string &Name, |
833 | 3 | bool isWeak) override { |
834 | 3 | if (isWeak) |
835 | 0 | return CGObjCGNU::GetClassNamed(CGF, Name, isWeak); |
836 | 3 | |
837 | 3 | EmitClassRef(Name); |
838 | 3 | std::string SymbolName = "_OBJC_CLASS_" + Name; |
839 | 3 | llvm::GlobalVariable *ClassSymbol = TheModule.getGlobalVariable(SymbolName); |
840 | 3 | if (!ClassSymbol) |
841 | 3 | ClassSymbol = new llvm::GlobalVariable(TheModule, LongTy, false, |
842 | 3 | llvm::GlobalValue::ExternalLinkage, |
843 | 3 | nullptr, SymbolName); |
844 | 3 | return ClassSymbol; |
845 | 3 | } |
846 | | |
847 | | public: |
848 | 5 | CGObjCObjFW(CodeGenModule &Mod): CGObjCGNU(Mod, 9, 3) { |
849 | 5 | // IMP objc_msg_lookup(id, SEL); |
850 | 5 | MsgLookupFn.init(&CGM, "objc_msg_lookup", IMPTy, IdTy, SelectorTy); |
851 | 5 | MsgLookupFnSRet.init(&CGM, "objc_msg_lookup_stret", IMPTy, IdTy, |
852 | 5 | SelectorTy); |
853 | 5 | // IMP objc_msg_lookup_super(struct objc_super*, SEL); |
854 | 5 | MsgLookupSuperFn.init(&CGM, "objc_msg_lookup_super", IMPTy, |
855 | 5 | PtrToObjCSuperTy, SelectorTy); |
856 | 5 | MsgLookupSuperFnSRet.init(&CGM, "objc_msg_lookup_super_stret", IMPTy, |
857 | 5 | PtrToObjCSuperTy, SelectorTy); |
858 | 5 | } |
859 | | }; |
860 | | } // end anonymous namespace |
861 | | |
862 | | /// Emits a reference to a dummy variable which is emitted with each class. |
863 | | /// This ensures that a linker error will be generated when trying to link |
864 | | /// together modules where a referenced class is not defined. |
865 | 12 | void CGObjCGNU::EmitClassRef(const std::string &className) { |
866 | 12 | std::string symbolRef = "__objc_class_ref_" + className; |
867 | 12 | // Don't emit two copies of the same symbol |
868 | 12 | if (TheModule.getGlobalVariable(symbolRef)) |
869 | 1 | return; |
870 | 11 | std::string symbolName = "__objc_class_name_" + className; |
871 | 11 | llvm::GlobalVariable *ClassSymbol = TheModule.getGlobalVariable(symbolName); |
872 | 11 | if (!ClassSymbol11 ) { |
873 | 7 | ClassSymbol = new llvm::GlobalVariable(TheModule, LongTy, false, |
874 | 7 | llvm::GlobalValue::ExternalLinkage, |
875 | 7 | nullptr, symbolName); |
876 | 7 | } |
877 | 12 | new llvm::GlobalVariable(TheModule, ClassSymbol->getType(), true, |
878 | 12 | llvm::GlobalValue::WeakAnyLinkage, ClassSymbol, symbolRef); |
879 | 12 | } |
880 | | |
881 | | static std::string SymbolNameForMethod( StringRef ClassName, |
882 | | StringRef CategoryName, const Selector MethodName, |
883 | 56 | bool isClassMethod) { |
884 | 56 | std::string MethodNameColonStripped = MethodName.getAsString(); |
885 | 56 | std::replace(MethodNameColonStripped.begin(), MethodNameColonStripped.end(), |
886 | 56 | ':', '_'); |
887 | 56 | return (Twine(isClassMethod ? "_c_"2 : "_i_"54 ) + ClassName + "_" + |
888 | 56 | CategoryName + "_" + MethodNameColonStripped).str(); |
889 | 56 | } |
890 | | |
891 | | CGObjCGNU::CGObjCGNU(CodeGenModule &cgm, unsigned runtimeABIVersion, |
892 | | unsigned protocolClassVersion) |
893 | | : CGObjCRuntime(cgm), TheModule(CGM.getModule()), |
894 | | VMContext(cgm.getLLVMContext()), ClassPtrAlias(nullptr), |
895 | | MetaClassPtrAlias(nullptr), RuntimeVersion(runtimeABIVersion), |
896 | 23 | ProtocolVersion(protocolClassVersion) { |
897 | 23 | |
898 | 23 | msgSendMDKind = VMContext.getMDKindID("GNUObjCMessageSend"); |
899 | 23 | |
900 | 23 | CodeGenTypes &Types = CGM.getTypes(); |
901 | 23 | IntTy = cast<llvm::IntegerType>( |
902 | 23 | Types.ConvertType(CGM.getContext().IntTy)); |
903 | 23 | LongTy = cast<llvm::IntegerType>( |
904 | 23 | Types.ConvertType(CGM.getContext().LongTy)); |
905 | 23 | SizeTy = cast<llvm::IntegerType>( |
906 | 23 | Types.ConvertType(CGM.getContext().getSizeType())); |
907 | 23 | PtrDiffTy = cast<llvm::IntegerType>( |
908 | 23 | Types.ConvertType(CGM.getContext().getPointerDiffType())); |
909 | 23 | BoolTy = CGM.getTypes().ConvertType(CGM.getContext().BoolTy); |
910 | 23 | |
911 | 23 | Int8Ty = llvm::Type::getInt8Ty(VMContext); |
912 | 23 | // C string type. Used in lots of places. |
913 | 23 | PtrToInt8Ty = llvm::PointerType::getUnqual(Int8Ty); |
914 | 23 | |
915 | 23 | Zeros[0] = llvm::ConstantInt::get(LongTy, 0); |
916 | 23 | Zeros[1] = Zeros[0]; |
917 | 23 | NULLPtr = llvm::ConstantPointerNull::get(PtrToInt8Ty); |
918 | 23 | // Get the selector Type. |
919 | 23 | QualType selTy = CGM.getContext().getObjCSelType(); |
920 | 23 | if (QualType() == selTy23 ) { |
921 | 0 | SelectorTy = PtrToInt8Ty; |
922 | 23 | } else { |
923 | 23 | SelectorTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(selTy)); |
924 | 23 | } |
925 | 23 | |
926 | 23 | PtrToIntTy = llvm::PointerType::getUnqual(IntTy); |
927 | 23 | PtrTy = PtrToInt8Ty; |
928 | 23 | |
929 | 23 | Int32Ty = llvm::Type::getInt32Ty(VMContext); |
930 | 23 | Int64Ty = llvm::Type::getInt64Ty(VMContext); |
931 | 23 | |
932 | 23 | IntPtrTy = |
933 | 23 | CGM.getDataLayout().getPointerSizeInBits() == 32 ? Int32Ty4 : Int64Ty19 ; |
934 | 23 | |
935 | 23 | // Object type |
936 | 23 | QualType UnqualIdTy = CGM.getContext().getObjCIdType(); |
937 | 23 | ASTIdTy = CanQualType(); |
938 | 23 | if (UnqualIdTy != QualType()23 ) { |
939 | 23 | ASTIdTy = CGM.getContext().getCanonicalType(UnqualIdTy); |
940 | 23 | IdTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(ASTIdTy)); |
941 | 23 | } else { |
942 | 0 | IdTy = PtrToInt8Ty; |
943 | 0 | } |
944 | 23 | PtrToIdTy = llvm::PointerType::getUnqual(IdTy); |
945 | 23 | |
946 | 23 | ObjCSuperTy = llvm::StructType::get(IdTy, IdTy); |
947 | 23 | PtrToObjCSuperTy = llvm::PointerType::getUnqual(ObjCSuperTy); |
948 | 23 | |
949 | 23 | llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext); |
950 | 23 | |
951 | 23 | // void objc_exception_throw(id); |
952 | 23 | ExceptionThrowFn.init(&CGM, "objc_exception_throw", VoidTy, IdTy); |
953 | 23 | ExceptionReThrowFn.init(&CGM, "objc_exception_throw", VoidTy, IdTy); |
954 | 23 | // int objc_sync_enter(id); |
955 | 23 | SyncEnterFn.init(&CGM, "objc_sync_enter", IntTy, IdTy); |
956 | 23 | // int objc_sync_exit(id); |
957 | 23 | SyncExitFn.init(&CGM, "objc_sync_exit", IntTy, IdTy); |
958 | 23 | |
959 | 23 | // void objc_enumerationMutation (id) |
960 | 23 | EnumerationMutationFn.init(&CGM, "objc_enumerationMutation", VoidTy, IdTy); |
961 | 23 | |
962 | 23 | // id objc_getProperty(id, SEL, ptrdiff_t, BOOL) |
963 | 23 | GetPropertyFn.init(&CGM, "objc_getProperty", IdTy, IdTy, SelectorTy, |
964 | 23 | PtrDiffTy, BoolTy); |
965 | 23 | // void objc_setProperty(id, SEL, ptrdiff_t, id, BOOL, BOOL) |
966 | 23 | SetPropertyFn.init(&CGM, "objc_setProperty", VoidTy, IdTy, SelectorTy, |
967 | 23 | PtrDiffTy, IdTy, BoolTy, BoolTy); |
968 | 23 | // void objc_setPropertyStruct(void*, void*, ptrdiff_t, BOOL, BOOL) |
969 | 23 | GetStructPropertyFn.init(&CGM, "objc_getPropertyStruct", VoidTy, PtrTy, PtrTy, |
970 | 23 | PtrDiffTy, BoolTy, BoolTy); |
971 | 23 | // void objc_setPropertyStruct(void*, void*, ptrdiff_t, BOOL, BOOL) |
972 | 23 | SetStructPropertyFn.init(&CGM, "objc_setPropertyStruct", VoidTy, PtrTy, PtrTy, |
973 | 23 | PtrDiffTy, BoolTy, BoolTy); |
974 | 23 | |
975 | 23 | // IMP type |
976 | 23 | llvm::Type *IMPArgs[] = { IdTy, SelectorTy }; |
977 | 23 | IMPTy = llvm::PointerType::getUnqual(llvm::FunctionType::get(IdTy, IMPArgs, |
978 | 23 | true)); |
979 | 23 | |
980 | 23 | const LangOptions &Opts = CGM.getLangOpts(); |
981 | 23 | if ((Opts.getGC() != LangOptions::NonGC) || 23 Opts.ObjCAutoRefCount23 ) |
982 | 1 | RuntimeVersion = 10; |
983 | 23 | |
984 | 23 | // Don't bother initialising the GC stuff unless we're compiling in GC mode |
985 | 23 | if (Opts.getGC() != LangOptions::NonGC23 ) { |
986 | 0 | // This is a bit of an hack. We should sort this out by having a proper |
987 | 0 | // CGObjCGNUstep subclass for GC, but we may want to really support the old |
988 | 0 | // ABI and GC added in ObjectiveC2.framework, so we fudge it a bit for now |
989 | 0 | // Get selectors needed in GC mode |
990 | 0 | RetainSel = GetNullarySelector("retain", CGM.getContext()); |
991 | 0 | ReleaseSel = GetNullarySelector("release", CGM.getContext()); |
992 | 0 | AutoreleaseSel = GetNullarySelector("autorelease", CGM.getContext()); |
993 | 0 |
|
994 | 0 | // Get functions needed in GC mode |
995 | 0 |
|
996 | 0 | // id objc_assign_ivar(id, id, ptrdiff_t); |
997 | 0 | IvarAssignFn.init(&CGM, "objc_assign_ivar", IdTy, IdTy, IdTy, PtrDiffTy); |
998 | 0 | // id objc_assign_strongCast (id, id*) |
999 | 0 | StrongCastAssignFn.init(&CGM, "objc_assign_strongCast", IdTy, IdTy, |
1000 | 0 | PtrToIdTy); |
1001 | 0 | // id objc_assign_global(id, id*); |
1002 | 0 | GlobalAssignFn.init(&CGM, "objc_assign_global", IdTy, IdTy, PtrToIdTy); |
1003 | 0 | // id objc_assign_weak(id, id*); |
1004 | 0 | WeakAssignFn.init(&CGM, "objc_assign_weak", IdTy, IdTy, PtrToIdTy); |
1005 | 0 | // id objc_read_weak(id*); |
1006 | 0 | WeakReadFn.init(&CGM, "objc_read_weak", IdTy, PtrToIdTy); |
1007 | 0 | // void *objc_memmove_collectable(void*, void *, size_t); |
1008 | 0 | MemMoveFn.init(&CGM, "objc_memmove_collectable", PtrTy, PtrTy, PtrTy, |
1009 | 0 | SizeTy); |
1010 | 0 | } |
1011 | 23 | } |
1012 | | |
1013 | | llvm::Value *CGObjCGNU::GetClassNamed(CodeGenFunction &CGF, |
1014 | 2 | const std::string &Name, bool isWeak) { |
1015 | 2 | llvm::Constant *ClassName = MakeConstantString(Name); |
1016 | 2 | // With the incompatible ABI, this will need to be replaced with a direct |
1017 | 2 | // reference to the class symbol. For the compatible nonfragile ABI we are |
1018 | 2 | // still performing this lookup at run time but emitting the symbol for the |
1019 | 2 | // class externally so that we can make the switch later. |
1020 | 2 | // |
1021 | 2 | // Libobjc2 contains an LLVM pass that replaces calls to objc_lookup_class |
1022 | 2 | // with memoized versions or with static references if it's safe to do so. |
1023 | 2 | if (!isWeak) |
1024 | 2 | EmitClassRef(Name); |
1025 | 2 | |
1026 | 2 | llvm::Constant *ClassLookupFn = |
1027 | 2 | CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, PtrToInt8Ty, true), |
1028 | 2 | "objc_lookup_class"); |
1029 | 2 | return CGF.EmitNounwindRuntimeCall(ClassLookupFn, ClassName); |
1030 | 2 | } |
1031 | | |
1032 | | // This has to perform the lookup every time, since posing and related |
1033 | | // techniques can modify the name -> class mapping. |
1034 | | llvm::Value *CGObjCGNU::GetClass(CodeGenFunction &CGF, |
1035 | 5 | const ObjCInterfaceDecl *OID) { |
1036 | 5 | auto *Value = |
1037 | 5 | GetClassNamed(CGF, OID->getNameAsString(), OID->isWeakImported()); |
1038 | 5 | if (CGM.getTriple().isOSBinFormatCOFF()5 ) { |
1039 | 1 | if (auto *ClassSymbol1 = dyn_cast<llvm::GlobalVariable>(Value)) { |
1040 | 1 | auto DLLStorage = llvm::GlobalValue::DefaultStorageClass; |
1041 | 1 | if (OID->hasAttr<DLLExportAttr>()) |
1042 | 0 | DLLStorage = llvm::GlobalValue::DLLExportStorageClass; |
1043 | 1 | else if (1 OID->hasAttr<DLLImportAttr>()1 ) |
1044 | 1 | DLLStorage = llvm::GlobalValue::DLLImportStorageClass; |
1045 | 1 | ClassSymbol->setDLLStorageClass(DLLStorage); |
1046 | 1 | } |
1047 | 1 | } |
1048 | 5 | return Value; |
1049 | 5 | } |
1050 | | |
1051 | 0 | llvm::Value *CGObjCGNU::EmitNSAutoreleasePoolClassRef(CodeGenFunction &CGF) { |
1052 | 0 | auto *Value = GetClassNamed(CGF, "NSAutoreleasePool", false); |
1053 | 0 | if (CGM.getTriple().isOSBinFormatCOFF()0 ) { |
1054 | 0 | if (auto *ClassSymbol0 = dyn_cast<llvm::GlobalVariable>(Value)) { |
1055 | 0 | IdentifierInfo &II = CGF.CGM.getContext().Idents.get("NSAutoreleasePool"); |
1056 | 0 | TranslationUnitDecl *TUDecl = CGM.getContext().getTranslationUnitDecl(); |
1057 | 0 | DeclContext *DC = TranslationUnitDecl::castToDeclContext(TUDecl); |
1058 | 0 |
|
1059 | 0 | const VarDecl *VD = nullptr; |
1060 | 0 | for (const auto &Result : DC->lookup(&II)) |
1061 | 0 | if (0 (VD = dyn_cast<VarDecl>(Result))0 ) |
1062 | 0 | break; |
1063 | 0 |
|
1064 | 0 | auto DLLStorage = llvm::GlobalValue::DefaultStorageClass; |
1065 | 0 | if (!VD || 0 VD->hasAttr<DLLImportAttr>()0 ) |
1066 | 0 | DLLStorage = llvm::GlobalValue::DLLImportStorageClass; |
1067 | 0 | else if (0 VD->hasAttr<DLLExportAttr>()0 ) |
1068 | 0 | DLLStorage = llvm::GlobalValue::DLLExportStorageClass; |
1069 | 0 |
|
1070 | 0 | ClassSymbol->setDLLStorageClass(DLLStorage); |
1071 | 0 | } |
1072 | 0 | } |
1073 | 0 | return Value; |
1074 | 0 | } |
1075 | | |
1076 | | llvm::Value *CGObjCGNU::GetSelector(CodeGenFunction &CGF, Selector Sel, |
1077 | 22 | const std::string &TypeEncoding) { |
1078 | 22 | SmallVectorImpl<TypedSelector> &Types = SelectorTable[Sel]; |
1079 | 22 | llvm::GlobalAlias *SelValue = nullptr; |
1080 | 22 | |
1081 | 22 | for (SmallVectorImpl<TypedSelector>::iterator i = Types.begin(), |
1082 | 22 | e = Types.end() ; i!=e22 ; i++0 ) { |
1083 | 3 | if (i->first == TypeEncoding3 ) { |
1084 | 3 | SelValue = i->second; |
1085 | 3 | break; |
1086 | 3 | } |
1087 | 3 | } |
1088 | 22 | if (!SelValue22 ) { |
1089 | 19 | SelValue = llvm::GlobalAlias::create( |
1090 | 19 | SelectorTy->getElementType(), 0, llvm::GlobalValue::PrivateLinkage, |
1091 | 19 | ".objc_selector_" + Sel.getAsString(), &TheModule); |
1092 | 19 | Types.emplace_back(TypeEncoding, SelValue); |
1093 | 19 | } |
1094 | 22 | |
1095 | 22 | return SelValue; |
1096 | 22 | } |
1097 | | |
1098 | 0 | Address CGObjCGNU::GetAddrOfSelector(CodeGenFunction &CGF, Selector Sel) { |
1099 | 0 | llvm::Value *SelValue = GetSelector(CGF, Sel); |
1100 | 0 |
|
1101 | 0 | // Store it to a temporary. Does this satisfy the semantics of |
1102 | 0 | // GetAddrOfSelector? Hopefully. |
1103 | 0 | Address tmp = CGF.CreateTempAlloca(SelValue->getType(), |
1104 | 0 | CGF.getPointerAlign()); |
1105 | 0 | CGF.Builder.CreateStore(SelValue, tmp); |
1106 | 0 | return tmp; |
1107 | 0 | } |
1108 | | |
1109 | 17 | llvm::Value *CGObjCGNU::GetSelector(CodeGenFunction &CGF, Selector Sel) { |
1110 | 17 | return GetSelector(CGF, Sel, std::string()); |
1111 | 17 | } |
1112 | | |
1113 | | llvm::Value *CGObjCGNU::GetSelector(CodeGenFunction &CGF, |
1114 | 5 | const ObjCMethodDecl *Method) { |
1115 | 5 | std::string SelTypes = CGM.getContext().getObjCEncodingForMethodDecl(Method); |
1116 | 5 | return GetSelector(CGF, Method->getSelector(), SelTypes); |
1117 | 5 | } |
1118 | | |
1119 | 15 | llvm::Constant *CGObjCGNU::GetEHType(QualType T) { |
1120 | 15 | if (T->isObjCIdType() || 15 T->isObjCQualifiedIdType()14 ) { |
1121 | 1 | // With the old ABI, there was only one kind of catchall, which broke |
1122 | 1 | // foreign exceptions. With the new ABI, we use __objc_id_typeinfo as |
1123 | 1 | // a pointer indicating object catchalls, and NULL to indicate real |
1124 | 1 | // catchalls |
1125 | 1 | if (CGM.getLangOpts().ObjCRuntime.isNonFragile()1 ) { |
1126 | 1 | return MakeConstantString("@id"); |
1127 | 0 | } else { |
1128 | 0 | return nullptr; |
1129 | 0 | } |
1130 | 14 | } |
1131 | 14 | |
1132 | 14 | // All other types should be Objective-C interface pointer types. |
1133 | 14 | const ObjCObjectPointerType *OPT = T->getAs<ObjCObjectPointerType>(); |
1134 | 14 | assert(OPT && "Invalid @catch type."); |
1135 | 14 | const ObjCInterfaceDecl *IDecl = OPT->getObjectType()->getInterface(); |
1136 | 14 | assert(IDecl && "Invalid @catch type."); |
1137 | 14 | return MakeConstantString(IDecl->getIdentifier()->getName()); |
1138 | 14 | } |
1139 | | |
1140 | 1 | llvm::Constant *CGObjCGNUstep::GetEHType(QualType T) { |
1141 | 1 | if (!CGM.getLangOpts().CPlusPlus) |
1142 | 1 | return CGObjCGNU::GetEHType(T); |
1143 | 0 |
|
1144 | 0 | // For Objective-C++, we want to provide the ability to catch both C++ and |
1145 | 0 | // Objective-C objects in the same function. |
1146 | 0 |
|
1147 | 0 | // There's a particular fixed type info for 'id'. |
1148 | 0 | if (0 T->isObjCIdType() || |
1149 | 0 | T->isObjCQualifiedIdType()0 ) { |
1150 | 0 | llvm::Constant *IDEHType = |
1151 | 0 | CGM.getModule().getGlobalVariable("__objc_id_type_info"); |
1152 | 0 | if (!IDEHType) |
1153 | 0 | IDEHType = |
1154 | 0 | new llvm::GlobalVariable(CGM.getModule(), PtrToInt8Ty, |
1155 | 0 | false, |
1156 | 0 | llvm::GlobalValue::ExternalLinkage, |
1157 | 0 | nullptr, "__objc_id_type_info"); |
1158 | 0 | return llvm::ConstantExpr::getBitCast(IDEHType, PtrToInt8Ty); |
1159 | 0 | } |
1160 | 0 |
|
1161 | 0 | const ObjCObjectPointerType *PT = |
1162 | 0 | T->getAs<ObjCObjectPointerType>(); |
1163 | 0 | assert(PT && "Invalid @catch type."); |
1164 | 0 | const ObjCInterfaceType *IT = PT->getInterfaceType(); |
1165 | 0 | assert(IT && "Invalid @catch type."); |
1166 | 0 | std::string className = IT->getDecl()->getIdentifier()->getName(); |
1167 | 0 |
|
1168 | 0 | std::string typeinfoName = "__objc_eh_typeinfo_" + className; |
1169 | 0 |
|
1170 | 0 | // Return the existing typeinfo if it exists |
1171 | 0 | llvm::Constant *typeinfo = TheModule.getGlobalVariable(typeinfoName); |
1172 | 0 | if (typeinfo) |
1173 | 0 | return llvm::ConstantExpr::getBitCast(typeinfo, PtrToInt8Ty); |
1174 | 0 |
|
1175 | 0 | // Otherwise create it. |
1176 | 0 |
|
1177 | 0 | // vtable for gnustep::libobjc::__objc_class_type_info |
1178 | 0 | // It's quite ugly hard-coding this. Ideally we'd generate it using the host |
1179 | 0 | // platform's name mangling. |
1180 | 0 | const char *vtableName = "_ZTVN7gnustep7libobjc22__objc_class_type_infoE"; |
1181 | 0 | auto *Vtable = TheModule.getGlobalVariable(vtableName); |
1182 | 0 | if (!Vtable0 ) { |
1183 | 0 | Vtable = new llvm::GlobalVariable(TheModule, PtrToInt8Ty, true, |
1184 | 0 | llvm::GlobalValue::ExternalLinkage, |
1185 | 0 | nullptr, vtableName); |
1186 | 0 | } |
1187 | 1 | llvm::Constant *Two = llvm::ConstantInt::get(IntTy, 2); |
1188 | 1 | auto *BVtable = llvm::ConstantExpr::getBitCast( |
1189 | 1 | llvm::ConstantExpr::getGetElementPtr(Vtable->getValueType(), Vtable, Two), |
1190 | 1 | PtrToInt8Ty); |
1191 | 1 | |
1192 | 1 | llvm::Constant *typeName = |
1193 | 1 | ExportUniqueString(className, "__objc_eh_typename_"); |
1194 | 1 | |
1195 | 1 | ConstantInitBuilder builder(CGM); |
1196 | 1 | auto fields = builder.beginStruct(); |
1197 | 1 | fields.add(BVtable); |
1198 | 1 | fields.add(typeName); |
1199 | 1 | llvm::Constant *TI = |
1200 | 1 | fields.finishAndCreateGlobal("__objc_eh_typeinfo_" + className, |
1201 | 1 | CGM.getPointerAlign(), |
1202 | 1 | /*constant*/ false, |
1203 | 1 | llvm::GlobalValue::LinkOnceODRLinkage); |
1204 | 1 | return llvm::ConstantExpr::getBitCast(TI, PtrToInt8Ty); |
1205 | 1 | } |
1206 | | |
1207 | | /// Generate an NSConstantString object. |
1208 | 3 | ConstantAddress CGObjCGNU::GenerateConstantString(const StringLiteral *SL) { |
1209 | 3 | |
1210 | 3 | std::string Str = SL->getString().str(); |
1211 | 3 | CharUnits Align = CGM.getPointerAlign(); |
1212 | 3 | |
1213 | 3 | // Look for an existing one |
1214 | 3 | llvm::StringMap<llvm::Constant*>::iterator old = ObjCStrings.find(Str); |
1215 | 3 | if (old != ObjCStrings.end()) |
1216 | 0 | return ConstantAddress(old->getValue(), Align); |
1217 | 3 | |
1218 | 3 | StringRef StringClass = CGM.getLangOpts().ObjCConstantStringClass; |
1219 | 3 | |
1220 | 3 | if (StringClass.empty()3 ) StringClass = "NXConstantString"2 ; |
1221 | 3 | |
1222 | 3 | std::string Sym = "_OBJC_CLASS_"; |
1223 | 3 | Sym += StringClass; |
1224 | 3 | |
1225 | 3 | llvm::Constant *isa = TheModule.getNamedGlobal(Sym); |
1226 | 3 | |
1227 | 3 | if (!isa) |
1228 | 3 | isa = new llvm::GlobalVariable(TheModule, IdTy, /* isConstant */false, |
1229 | 3 | llvm::GlobalValue::ExternalWeakLinkage, nullptr, Sym); |
1230 | 0 | else if (0 isa->getType() != PtrToIdTy0 ) |
1231 | 0 | isa = llvm::ConstantExpr::getBitCast(isa, PtrToIdTy); |
1232 | 3 | |
1233 | 3 | ConstantInitBuilder Builder(CGM); |
1234 | 3 | auto Fields = Builder.beginStruct(); |
1235 | 3 | Fields.add(isa); |
1236 | 3 | Fields.add(MakeConstantString(Str)); |
1237 | 3 | Fields.addInt(IntTy, Str.size()); |
1238 | 3 | llvm::Constant *ObjCStr = |
1239 | 3 | Fields.finishAndCreateGlobal(".objc_str", Align); |
1240 | 3 | ObjCStr = llvm::ConstantExpr::getBitCast(ObjCStr, PtrToInt8Ty); |
1241 | 3 | ObjCStrings[Str] = ObjCStr; |
1242 | 3 | ConstantStrings.push_back(ObjCStr); |
1243 | 3 | return ConstantAddress(ObjCStr, Align); |
1244 | 3 | } |
1245 | | |
1246 | | ///Generates a message send where the super is the receiver. This is a message |
1247 | | ///send to self with special delivery semantics indicating which class's method |
1248 | | ///should be called. |
1249 | | RValue |
1250 | | CGObjCGNU::GenerateMessageSendSuper(CodeGenFunction &CGF, |
1251 | | ReturnValueSlot Return, |
1252 | | QualType ResultType, |
1253 | | Selector Sel, |
1254 | | const ObjCInterfaceDecl *Class, |
1255 | | bool isCategoryImpl, |
1256 | | llvm::Value *Receiver, |
1257 | | bool IsClassMessage, |
1258 | | const CallArgList &CallArgs, |
1259 | 3 | const ObjCMethodDecl *Method) { |
1260 | 3 | CGBuilderTy &Builder = CGF.Builder; |
1261 | 3 | if (CGM.getLangOpts().getGC() == LangOptions::GCOnly3 ) { |
1262 | 0 | if (Sel == RetainSel || 0 Sel == AutoreleaseSel0 ) { |
1263 | 0 | return RValue::get(EnforceType(Builder, Receiver, |
1264 | 0 | CGM.getTypes().ConvertType(ResultType))); |
1265 | 0 | } |
1266 | 0 | if (0 Sel == ReleaseSel0 ) { |
1267 | 0 | return RValue::get(nullptr); |
1268 | 0 | } |
1269 | 3 | } |
1270 | 3 | |
1271 | 3 | llvm::Value *cmd = GetSelector(CGF, Sel); |
1272 | 3 | CallArgList ActualArgs; |
1273 | 3 | |
1274 | 3 | ActualArgs.add(RValue::get(EnforceType(Builder, Receiver, IdTy)), ASTIdTy); |
1275 | 3 | ActualArgs.add(RValue::get(cmd), CGF.getContext().getObjCSelType()); |
1276 | 3 | ActualArgs.addFrom(CallArgs); |
1277 | 3 | |
1278 | 3 | MessageSendInfo MSI = getMessageSendInfo(Method, ResultType, ActualArgs); |
1279 | 3 | |
1280 | 3 | llvm::Value *ReceiverClass = nullptr; |
1281 | 3 | if (isCategoryImpl3 ) { |
1282 | 0 | llvm::Constant *classLookupFunction = nullptr; |
1283 | 0 | if (IsClassMessage0 ) { |
1284 | 0 | classLookupFunction = CGM.CreateRuntimeFunction(llvm::FunctionType::get( |
1285 | 0 | IdTy, PtrTy, true), "objc_get_meta_class"); |
1286 | 0 | } else { |
1287 | 0 | classLookupFunction = CGM.CreateRuntimeFunction(llvm::FunctionType::get( |
1288 | 0 | IdTy, PtrTy, true), "objc_get_class"); |
1289 | 0 | } |
1290 | 0 | ReceiverClass = Builder.CreateCall(classLookupFunction, |
1291 | 0 | MakeConstantString(Class->getNameAsString())); |
1292 | 3 | } else { |
1293 | 3 | // Set up global aliases for the metaclass or class pointer if they do not |
1294 | 3 | // already exist. These will are forward-references which will be set to |
1295 | 3 | // pointers to the class and metaclass structure created for the runtime |
1296 | 3 | // load function. To send a message to super, we look up the value of the |
1297 | 3 | // super_class pointer from either the class or metaclass structure. |
1298 | 3 | if (IsClassMessage3 ) { |
1299 | 1 | if (!MetaClassPtrAlias1 ) { |
1300 | 1 | MetaClassPtrAlias = llvm::GlobalAlias::create( |
1301 | 1 | IdTy->getElementType(), 0, llvm::GlobalValue::InternalLinkage, |
1302 | 1 | ".objc_metaclass_ref" + Class->getNameAsString(), &TheModule); |
1303 | 1 | } |
1304 | 1 | ReceiverClass = MetaClassPtrAlias; |
1305 | 3 | } else { |
1306 | 2 | if (!ClassPtrAlias2 ) { |
1307 | 1 | ClassPtrAlias = llvm::GlobalAlias::create( |
1308 | 1 | IdTy->getElementType(), 0, llvm::GlobalValue::InternalLinkage, |
1309 | 1 | ".objc_class_ref" + Class->getNameAsString(), &TheModule); |
1310 | 1 | } |
1311 | 2 | ReceiverClass = ClassPtrAlias; |
1312 | 2 | } |
1313 | 3 | } |
1314 | 3 | // Cast the pointer to a simplified version of the class structure |
1315 | 3 | llvm::Type *CastTy = llvm::StructType::get(IdTy, IdTy); |
1316 | 3 | ReceiverClass = Builder.CreateBitCast(ReceiverClass, |
1317 | 3 | llvm::PointerType::getUnqual(CastTy)); |
1318 | 3 | // Get the superclass pointer |
1319 | 3 | ReceiverClass = Builder.CreateStructGEP(CastTy, ReceiverClass, 1); |
1320 | 3 | // Load the superclass pointer |
1321 | 3 | ReceiverClass = |
1322 | 3 | Builder.CreateAlignedLoad(ReceiverClass, CGF.getPointerAlign()); |
1323 | 3 | // Construct the structure used to look up the IMP |
1324 | 3 | llvm::StructType *ObjCSuperTy = |
1325 | 3 | llvm::StructType::get(Receiver->getType(), IdTy); |
1326 | 3 | |
1327 | 3 | // FIXME: Is this really supposed to be a dynamic alloca? |
1328 | 3 | Address ObjCSuper = Address(Builder.CreateAlloca(ObjCSuperTy), |
1329 | 3 | CGF.getPointerAlign()); |
1330 | 3 | |
1331 | 3 | Builder.CreateStore(Receiver, |
1332 | 3 | Builder.CreateStructGEP(ObjCSuper, 0, CharUnits::Zero())); |
1333 | 3 | Builder.CreateStore(ReceiverClass, |
1334 | 3 | Builder.CreateStructGEP(ObjCSuper, 1, CGF.getPointerSize())); |
1335 | 3 | |
1336 | 3 | ObjCSuper = EnforceType(Builder, ObjCSuper, PtrToObjCSuperTy); |
1337 | 3 | |
1338 | 3 | // Get the IMP |
1339 | 3 | llvm::Value *imp = LookupIMPSuper(CGF, ObjCSuper, cmd, MSI); |
1340 | 3 | imp = EnforceType(Builder, imp, MSI.MessengerType); |
1341 | 3 | |
1342 | 3 | llvm::Metadata *impMD[] = { |
1343 | 3 | llvm::MDString::get(VMContext, Sel.getAsString()), |
1344 | 3 | llvm::MDString::get(VMContext, Class->getSuperClass()->getNameAsString()), |
1345 | 3 | llvm::ConstantAsMetadata::get(llvm::ConstantInt::get( |
1346 | 3 | llvm::Type::getInt1Ty(VMContext), IsClassMessage))}; |
1347 | 3 | llvm::MDNode *node = llvm::MDNode::get(VMContext, impMD); |
1348 | 3 | |
1349 | 3 | CGCallee callee(CGCalleeInfo(), imp); |
1350 | 3 | |
1351 | 3 | llvm::Instruction *call; |
1352 | 3 | RValue msgRet = CGF.EmitCall(MSI.CallInfo, callee, Return, ActualArgs, &call); |
1353 | 3 | call->setMetadata(msgSendMDKind, node); |
1354 | 3 | return msgRet; |
1355 | 3 | } |
1356 | | |
1357 | | /// Generate code for a message send expression. |
1358 | | RValue |
1359 | | CGObjCGNU::GenerateMessageSend(CodeGenFunction &CGF, |
1360 | | ReturnValueSlot Return, |
1361 | | QualType ResultType, |
1362 | | Selector Sel, |
1363 | | llvm::Value *Receiver, |
1364 | | const CallArgList &CallArgs, |
1365 | | const ObjCInterfaceDecl *Class, |
1366 | 17 | const ObjCMethodDecl *Method) { |
1367 | 17 | CGBuilderTy &Builder = CGF.Builder; |
1368 | 17 | |
1369 | 17 | // Strip out message sends to retain / release in GC mode |
1370 | 17 | if (CGM.getLangOpts().getGC() == LangOptions::GCOnly17 ) { |
1371 | 0 | if (Sel == RetainSel || 0 Sel == AutoreleaseSel0 ) { |
1372 | 0 | return RValue::get(EnforceType(Builder, Receiver, |
1373 | 0 | CGM.getTypes().ConvertType(ResultType))); |
1374 | 0 | } |
1375 | 0 | if (0 Sel == ReleaseSel0 ) { |
1376 | 0 | return RValue::get(nullptr); |
1377 | 0 | } |
1378 | 17 | } |
1379 | 17 | |
1380 | 17 | // If the return type is something that goes in an integer register, the |
1381 | 17 | // runtime will handle 0 returns. For other cases, we fill in the 0 value |
1382 | 17 | // ourselves. |
1383 | 17 | // |
1384 | 17 | // The language spec says the result of this kind of message send is |
1385 | 17 | // undefined, but lots of people seem to have forgotten to read that |
1386 | 17 | // paragraph and insist on sending messages to nil that have structure |
1387 | 17 | // returns. With GCC, this generates a random return value (whatever happens |
1388 | 17 | // to be on the stack / in those registers at the time) on most platforms, |
1389 | 17 | // and generates an illegal instruction trap on SPARC. With LLVM it corrupts |
1390 | 17 | // the stack. |
1391 | 17 | bool isPointerSizedReturn = (ResultType->isAnyPointerType() || |
1392 | 17 | ResultType->isIntegralOrEnumerationType()5 || ResultType->isVoidType()3 ); |
1393 | 17 | |
1394 | 17 | llvm::BasicBlock *startBB = nullptr; |
1395 | 17 | llvm::BasicBlock *messageBB = nullptr; |
1396 | 17 | llvm::BasicBlock *continueBB = nullptr; |
1397 | 17 | |
1398 | 17 | if (!isPointerSizedReturn17 ) { |
1399 | 2 | startBB = Builder.GetInsertBlock(); |
1400 | 2 | messageBB = CGF.createBasicBlock("msgSend"); |
1401 | 2 | continueBB = CGF.createBasicBlock("continue"); |
1402 | 2 | |
1403 | 2 | llvm::Value *isNil = Builder.CreateICmpEQ(Receiver, |
1404 | 2 | llvm::Constant::getNullValue(Receiver->getType())); |
1405 | 2 | Builder.CreateCondBr(isNil, continueBB, messageBB); |
1406 | 2 | CGF.EmitBlock(messageBB); |
1407 | 2 | } |
1408 | 17 | |
1409 | 17 | IdTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(ASTIdTy)); |
1410 | 17 | llvm::Value *cmd; |
1411 | 17 | if (Method) |
1412 | 5 | cmd = GetSelector(CGF, Method); |
1413 | 17 | else |
1414 | 12 | cmd = GetSelector(CGF, Sel); |
1415 | 17 | cmd = EnforceType(Builder, cmd, SelectorTy); |
1416 | 17 | Receiver = EnforceType(Builder, Receiver, IdTy); |
1417 | 17 | |
1418 | 17 | llvm::Metadata *impMD[] = { |
1419 | 17 | llvm::MDString::get(VMContext, Sel.getAsString()), |
1420 | 17 | llvm::MDString::get(VMContext, Class ? Class->getNameAsString()5 : ""12 ), |
1421 | 17 | llvm::ConstantAsMetadata::get(llvm::ConstantInt::get( |
1422 | 17 | llvm::Type::getInt1Ty(VMContext), Class != nullptr))}; |
1423 | 17 | llvm::MDNode *node = llvm::MDNode::get(VMContext, impMD); |
1424 | 17 | |
1425 | 17 | CallArgList ActualArgs; |
1426 | 17 | ActualArgs.add(RValue::get(Receiver), ASTIdTy); |
1427 | 17 | ActualArgs.add(RValue::get(cmd), CGF.getContext().getObjCSelType()); |
1428 | 17 | ActualArgs.addFrom(CallArgs); |
1429 | 17 | |
1430 | 17 | MessageSendInfo MSI = getMessageSendInfo(Method, ResultType, ActualArgs); |
1431 | 17 | |
1432 | 17 | // Get the IMP to call |
1433 | 17 | llvm::Value *imp; |
1434 | 17 | |
1435 | 17 | // If we have non-legacy dispatch specified, we try using the objc_msgSend() |
1436 | 17 | // functions. These are not supported on all platforms (or all runtimes on a |
1437 | 17 | // given platform), so we |
1438 | 17 | switch (CGM.getCodeGenOpts().getObjCDispatchMethod()) { |
1439 | 17 | case CodeGenOptions::Legacy: |
1440 | 17 | imp = LookupIMP(CGF, Receiver, cmd, node, MSI); |
1441 | 17 | break; |
1442 | 0 | case CodeGenOptions::Mixed: |
1443 | 0 | case CodeGenOptions::NonLegacy: |
1444 | 0 | if (CGM.ReturnTypeUsesFPRet(ResultType)0 ) { |
1445 | 0 | imp = CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, IdTy, true), |
1446 | 0 | "objc_msgSend_fpret"); |
1447 | 0 | } else if (0 CGM.ReturnTypeUsesSRet(MSI.CallInfo)0 ) { |
1448 | 0 | // The actual types here don't matter - we're going to bitcast the |
1449 | 0 | // function anyway |
1450 | 0 | imp = CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, IdTy, true), |
1451 | 0 | "objc_msgSend_stret"); |
1452 | 0 | } else { |
1453 | 0 | imp = CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, IdTy, true), |
1454 | 0 | "objc_msgSend"); |
1455 | 0 | } |
1456 | 17 | } |
1457 | 17 | |
1458 | 17 | // Reset the receiver in case the lookup modified it |
1459 | 17 | ActualArgs[0] = CallArg(RValue::get(Receiver), ASTIdTy, false); |
1460 | 17 | |
1461 | 17 | imp = EnforceType(Builder, imp, MSI.MessengerType); |
1462 | 17 | |
1463 | 17 | llvm::Instruction *call; |
1464 | 17 | CGCallee callee(CGCalleeInfo(), imp); |
1465 | 17 | RValue msgRet = CGF.EmitCall(MSI.CallInfo, callee, Return, ActualArgs, &call); |
1466 | 17 | call->setMetadata(msgSendMDKind, node); |
1467 | 17 | |
1468 | 17 | |
1469 | 17 | if (!isPointerSizedReturn17 ) { |
1470 | 2 | messageBB = CGF.Builder.GetInsertBlock(); |
1471 | 2 | CGF.Builder.CreateBr(continueBB); |
1472 | 2 | CGF.EmitBlock(continueBB); |
1473 | 2 | if (msgRet.isScalar()2 ) { |
1474 | 0 | llvm::Value *v = msgRet.getScalarVal(); |
1475 | 0 | llvm::PHINode *phi = Builder.CreatePHI(v->getType(), 2); |
1476 | 0 | phi->addIncoming(v, messageBB); |
1477 | 0 | phi->addIncoming(llvm::Constant::getNullValue(v->getType()), startBB); |
1478 | 0 | msgRet = RValue::get(phi); |
1479 | 2 | } else if (2 msgRet.isAggregate()2 ) { |
1480 | 2 | Address v = msgRet.getAggregateAddress(); |
1481 | 2 | llvm::PHINode *phi = Builder.CreatePHI(v.getType(), 2); |
1482 | 2 | llvm::Type *RetTy = v.getElementType(); |
1483 | 2 | Address NullVal = CGF.CreateTempAlloca(RetTy, v.getAlignment(), "null"); |
1484 | 2 | CGF.InitTempAlloca(NullVal, llvm::Constant::getNullValue(RetTy)); |
1485 | 2 | phi->addIncoming(v.getPointer(), messageBB); |
1486 | 2 | phi->addIncoming(NullVal.getPointer(), startBB); |
1487 | 2 | msgRet = RValue::getAggregate(Address(phi, v.getAlignment())); |
1488 | 2 | } else /* isComplex() */ { |
1489 | 0 | std::pair<llvm::Value*,llvm::Value*> v = msgRet.getComplexVal(); |
1490 | 0 | llvm::PHINode *phi = Builder.CreatePHI(v.first->getType(), 2); |
1491 | 0 | phi->addIncoming(v.first, messageBB); |
1492 | 0 | phi->addIncoming(llvm::Constant::getNullValue(v.first->getType()), |
1493 | 0 | startBB); |
1494 | 0 | llvm::PHINode *phi2 = Builder.CreatePHI(v.second->getType(), 2); |
1495 | 0 | phi2->addIncoming(v.second, messageBB); |
1496 | 0 | phi2->addIncoming(llvm::Constant::getNullValue(v.second->getType()), |
1497 | 0 | startBB); |
1498 | 0 | msgRet = RValue::getComplex(phi, phi2); |
1499 | 0 | } |
1500 | 2 | } |
1501 | 17 | return msgRet; |
1502 | 17 | } |
1503 | | |
1504 | | /// Generates a MethodList. Used in construction of a objc_class and |
1505 | | /// objc_category structures. |
1506 | | llvm::Constant *CGObjCGNU:: |
1507 | | GenerateMethodList(StringRef ClassName, |
1508 | | StringRef CategoryName, |
1509 | | ArrayRef<Selector> MethodSels, |
1510 | | ArrayRef<llvm::Constant *> MethodTypes, |
1511 | 70 | bool isClassMethodList) { |
1512 | 70 | if (MethodSels.empty()) |
1513 | 62 | return NULLPtr; |
1514 | 8 | |
1515 | 8 | ConstantInitBuilder Builder(CGM); |
1516 | 8 | |
1517 | 8 | auto MethodList = Builder.beginStruct(); |
1518 | 8 | MethodList.addNullPointer(CGM.Int8PtrTy); |
1519 | 8 | MethodList.addInt(Int32Ty, MethodTypes.size()); |
1520 | 8 | |
1521 | 8 | // Get the method structure type. |
1522 | 8 | llvm::StructType *ObjCMethodTy = |
1523 | 8 | llvm::StructType::get(CGM.getLLVMContext(), { |
1524 | 8 | PtrToInt8Ty, // Really a selector, but the runtime creates it us. |
1525 | 8 | PtrToInt8Ty, // Method types |
1526 | 8 | IMPTy // Method pointer |
1527 | 8 | }); |
1528 | 8 | auto Methods = MethodList.beginArray(); |
1529 | 36 | for (unsigned int i = 0, e = MethodTypes.size(); i < e36 ; ++i28 ) { |
1530 | 28 | llvm::Constant *FnPtr = |
1531 | 28 | TheModule.getFunction(SymbolNameForMethod(ClassName, CategoryName, |
1532 | 28 | MethodSels[i], |
1533 | 28 | isClassMethodList)); |
1534 | 28 | assert(FnPtr && "Can't generate metadata for method that doesn't exist"); |
1535 | 28 | auto Method = Methods.beginStruct(ObjCMethodTy); |
1536 | 28 | Method.add(MakeConstantString(MethodSels[i].getAsString())); |
1537 | 28 | Method.add(MethodTypes[i]); |
1538 | 28 | Method.addBitCast(FnPtr, IMPTy); |
1539 | 28 | Method.finishAndAddTo(Methods); |
1540 | 28 | } |
1541 | 70 | Methods.finishAndAddTo(MethodList); |
1542 | 70 | |
1543 | 70 | // Create an instance of the structure |
1544 | 70 | return MethodList.finishAndCreateGlobal(".objc_method_list", |
1545 | 70 | CGM.getPointerAlign()); |
1546 | 70 | } |
1547 | | |
1548 | | /// Generates an IvarList. Used in construction of a objc_class. |
1549 | | llvm::Constant *CGObjCGNU:: |
1550 | | GenerateIvarList(ArrayRef<llvm::Constant *> IvarNames, |
1551 | | ArrayRef<llvm::Constant *> IvarTypes, |
1552 | 32 | ArrayRef<llvm::Constant *> IvarOffsets) { |
1553 | 32 | if (IvarNames.empty()) |
1554 | 20 | return NULLPtr; |
1555 | 12 | |
1556 | 12 | ConstantInitBuilder Builder(CGM); |
1557 | 12 | |
1558 | 12 | // Structure containing array count followed by array. |
1559 | 12 | auto IvarList = Builder.beginStruct(); |
1560 | 12 | IvarList.addInt(IntTy, (int)IvarNames.size()); |
1561 | 12 | |
1562 | 12 | // Get the ivar structure type. |
1563 | 12 | llvm::StructType *ObjCIvarTy = |
1564 | 12 | llvm::StructType::get(PtrToInt8Ty, PtrToInt8Ty, IntTy); |
1565 | 12 | |
1566 | 12 | // Array of ivar structures. |
1567 | 12 | auto Ivars = IvarList.beginArray(ObjCIvarTy); |
1568 | 38 | for (unsigned int i = 0, e = IvarNames.size() ; i < e38 ; i++26 ) { |
1569 | 26 | auto Ivar = Ivars.beginStruct(ObjCIvarTy); |
1570 | 26 | Ivar.add(IvarNames[i]); |
1571 | 26 | Ivar.add(IvarTypes[i]); |
1572 | 26 | Ivar.add(IvarOffsets[i]); |
1573 | 26 | Ivar.finishAndAddTo(Ivars); |
1574 | 26 | } |
1575 | 32 | Ivars.finishAndAddTo(IvarList); |
1576 | 32 | |
1577 | 32 | // Create an instance of the structure |
1578 | 32 | return IvarList.finishAndCreateGlobal(".objc_ivar_list", |
1579 | 32 | CGM.getPointerAlign()); |
1580 | 32 | } |
1581 | | |
1582 | | /// Generate a class structure |
1583 | | llvm::Constant *CGObjCGNU::GenerateClassStructure( |
1584 | | llvm::Constant *MetaClass, |
1585 | | llvm::Constant *SuperClass, |
1586 | | unsigned info, |
1587 | | const char *Name, |
1588 | | llvm::Constant *Version, |
1589 | | llvm::Constant *InstanceSize, |
1590 | | llvm::Constant *IVars, |
1591 | | llvm::Constant *Methods, |
1592 | | llvm::Constant *Protocols, |
1593 | | llvm::Constant *IvarOffsets, |
1594 | | llvm::Constant *Properties, |
1595 | | llvm::Constant *StrongIvarBitmap, |
1596 | | llvm::Constant *WeakIvarBitmap, |
1597 | 32 | bool isMeta) { |
1598 | 32 | // Set up the class structure |
1599 | 32 | // Note: Several of these are char*s when they should be ids. This is |
1600 | 32 | // because the runtime performs this translation on load. |
1601 | 32 | // |
1602 | 32 | // Fields marked New ABI are part of the GNUstep runtime. We emit them |
1603 | 32 | // anyway; the classes will still work with the GNU runtime, they will just |
1604 | 32 | // be ignored. |
1605 | 32 | llvm::StructType *ClassTy = llvm::StructType::get( |
1606 | 32 | PtrToInt8Ty, // isa |
1607 | 32 | PtrToInt8Ty, // super_class |
1608 | 32 | PtrToInt8Ty, // name |
1609 | 32 | LongTy, // version |
1610 | 32 | LongTy, // info |
1611 | 32 | LongTy, // instance_size |
1612 | 32 | IVars->getType(), // ivars |
1613 | 32 | Methods->getType(), // methods |
1614 | 32 | // These are all filled in by the runtime, so we pretend |
1615 | 32 | PtrTy, // dtable |
1616 | 32 | PtrTy, // subclass_list |
1617 | 32 | PtrTy, // sibling_class |
1618 | 32 | PtrTy, // protocols |
1619 | 32 | PtrTy, // gc_object_type |
1620 | 32 | // New ABI: |
1621 | 32 | LongTy, // abi_version |
1622 | 32 | IvarOffsets->getType(), // ivar_offsets |
1623 | 32 | Properties->getType(), // properties |
1624 | 32 | IntPtrTy, // strong_pointers |
1625 | 32 | IntPtrTy // weak_pointers |
1626 | 32 | ); |
1627 | 32 | |
1628 | 32 | ConstantInitBuilder Builder(CGM); |
1629 | 32 | auto Elements = Builder.beginStruct(ClassTy); |
1630 | 32 | |
1631 | 32 | // Fill in the structure |
1632 | 32 | |
1633 | 32 | // isa |
1634 | 32 | Elements.addBitCast(MetaClass, PtrToInt8Ty); |
1635 | 32 | // super_class |
1636 | 32 | Elements.add(SuperClass); |
1637 | 32 | // name |
1638 | 32 | Elements.add(MakeConstantString(Name, ".class_name")); |
1639 | 32 | // version |
1640 | 32 | Elements.addInt(LongTy, 0); |
1641 | 32 | // info |
1642 | 32 | Elements.addInt(LongTy, info); |
1643 | 32 | // instance_size |
1644 | 32 | if (isMeta32 ) { |
1645 | 16 | llvm::DataLayout td(&TheModule); |
1646 | 16 | Elements.addInt(LongTy, |
1647 | 16 | td.getTypeSizeInBits(ClassTy) / |
1648 | 16 | CGM.getContext().getCharWidth()); |
1649 | 16 | } else |
1650 | 16 | Elements.add(InstanceSize); |
1651 | 32 | // ivars |
1652 | 32 | Elements.add(IVars); |
1653 | 32 | // methods |
1654 | 32 | Elements.add(Methods); |
1655 | 32 | // These are all filled in by the runtime, so we pretend |
1656 | 32 | // dtable |
1657 | 32 | Elements.add(NULLPtr); |
1658 | 32 | // subclass_list |
1659 | 32 | Elements.add(NULLPtr); |
1660 | 32 | // sibling_class |
1661 | 32 | Elements.add(NULLPtr); |
1662 | 32 | // protocols |
1663 | 32 | Elements.addBitCast(Protocols, PtrTy); |
1664 | 32 | // gc_object_type |
1665 | 32 | Elements.add(NULLPtr); |
1666 | 32 | // abi_version |
1667 | 32 | Elements.addInt(LongTy, 1); |
1668 | 32 | // ivar_offsets |
1669 | 32 | Elements.add(IvarOffsets); |
1670 | 32 | // properties |
1671 | 32 | Elements.add(Properties); |
1672 | 32 | // strong_pointers |
1673 | 32 | Elements.add(StrongIvarBitmap); |
1674 | 32 | // weak_pointers |
1675 | 32 | Elements.add(WeakIvarBitmap); |
1676 | 32 | // Create an instance of the structure |
1677 | 32 | // This is now an externally visible symbol, so that we can speed up class |
1678 | 32 | // messages in the next ABI. We may already have some weak references to |
1679 | 32 | // this, so check and fix them properly. |
1680 | 32 | std::string ClassSym((isMeta ? "_OBJC_METACLASS_"16 : "_OBJC_CLASS_"16 ) + |
1681 | 32 | std::string(Name)); |
1682 | 32 | llvm::GlobalVariable *ClassRef = TheModule.getNamedGlobal(ClassSym); |
1683 | 32 | llvm::Constant *Class = |
1684 | 32 | Elements.finishAndCreateGlobal(ClassSym, CGM.getPointerAlign(), false, |
1685 | 32 | llvm::GlobalValue::ExternalLinkage); |
1686 | 32 | if (ClassRef32 ) { |
1687 | 0 | ClassRef->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(Class, |
1688 | 0 | ClassRef->getType())); |
1689 | 0 | ClassRef->removeFromParent(); |
1690 | 0 | Class->setName(ClassSym); |
1691 | 0 | } |
1692 | 32 | return Class; |
1693 | 32 | } |
1694 | | |
1695 | | llvm::Constant *CGObjCGNU:: |
1696 | | GenerateProtocolMethodList(ArrayRef<llvm::Constant *> MethodNames, |
1697 | 9 | ArrayRef<llvm::Constant *> MethodTypes) { |
1698 | 9 | // Get the method structure type. |
1699 | 9 | llvm::StructType *ObjCMethodDescTy = |
1700 | 9 | llvm::StructType::get(CGM.getLLVMContext(), { PtrToInt8Ty, PtrToInt8Ty }); |
1701 | 9 | ConstantInitBuilder Builder(CGM); |
1702 | 9 | auto MethodList = Builder.beginStruct(); |
1703 | 9 | MethodList.addInt(IntTy, MethodNames.size()); |
1704 | 9 | auto Methods = MethodList.beginArray(ObjCMethodDescTy); |
1705 | 10 | for (unsigned int i = 0, e = MethodTypes.size() ; i < e10 ; i++1 ) { |
1706 | 1 | auto Method = Methods.beginStruct(ObjCMethodDescTy); |
1707 | 1 | Method.add(MethodNames[i]); |
1708 | 1 | Method.add(MethodTypes[i]); |
1709 | 1 | Method.finishAndAddTo(Methods); |
1710 | 1 | } |
1711 | 9 | Methods.finishAndAddTo(MethodList); |
1712 | 9 | return MethodList.finishAndCreateGlobal(".objc_method_list", |
1713 | 9 | CGM.getPointerAlign()); |
1714 | 9 | } |
1715 | | |
1716 | | // Create the protocol list structure used in classes, categories and so on |
1717 | | llvm::Constant * |
1718 | 20 | CGObjCGNU::GenerateProtocolList(ArrayRef<std::string> Protocols) { |
1719 | 20 | |
1720 | 20 | ConstantInitBuilder Builder(CGM); |
1721 | 20 | auto ProtocolList = Builder.beginStruct(); |
1722 | 20 | ProtocolList.add(NULLPtr); |
1723 | 20 | ProtocolList.addInt(LongTy, Protocols.size()); |
1724 | 20 | |
1725 | 20 | auto Elements = ProtocolList.beginArray(PtrToInt8Ty); |
1726 | 20 | for (const std::string *iter = Protocols.begin(), *endIter = Protocols.end(); |
1727 | 22 | iter != endIter22 ; iter++2 ) { |
1728 | 2 | llvm::Constant *protocol = nullptr; |
1729 | 2 | llvm::StringMap<llvm::Constant*>::iterator value = |
1730 | 2 | ExistingProtocols.find(*iter); |
1731 | 2 | if (value == ExistingProtocols.end()2 ) { |
1732 | 1 | protocol = GenerateEmptyProtocol(*iter); |
1733 | 2 | } else { |
1734 | 1 | protocol = value->getValue(); |
1735 | 1 | } |
1736 | 2 | Elements.addBitCast(protocol, PtrToInt8Ty); |
1737 | 2 | } |
1738 | 20 | Elements.finishAndAddTo(ProtocolList); |
1739 | 20 | return ProtocolList.finishAndCreateGlobal(".objc_protocol_list", |
1740 | 20 | CGM.getPointerAlign()); |
1741 | 20 | } |
1742 | | |
1743 | | llvm::Value *CGObjCGNU::GenerateProtocolRef(CodeGenFunction &CGF, |
1744 | 0 | const ObjCProtocolDecl *PD) { |
1745 | 0 | llvm::Value *protocol = ExistingProtocols[PD->getNameAsString()]; |
1746 | 0 | llvm::Type *T = |
1747 | 0 | CGM.getTypes().ConvertType(CGM.getContext().getObjCProtoType()); |
1748 | 0 | return CGF.Builder.CreateBitCast(protocol, llvm::PointerType::getUnqual(T)); |
1749 | 0 | } |
1750 | | |
1751 | | llvm::Constant * |
1752 | 1 | CGObjCGNU::GenerateEmptyProtocol(const std::string &ProtocolName) { |
1753 | 1 | llvm::Constant *ProtocolList = GenerateProtocolList({}); |
1754 | 1 | llvm::Constant *MethodList = GenerateProtocolMethodList({}, {}); |
1755 | 1 | // Protocols are objects containing lists of the methods implemented and |
1756 | 1 | // protocols adopted. |
1757 | 1 | ConstantInitBuilder Builder(CGM); |
1758 | 1 | auto Elements = Builder.beginStruct(); |
1759 | 1 | |
1760 | 1 | // The isa pointer must be set to a magic number so the runtime knows it's |
1761 | 1 | // the correct layout. |
1762 | 1 | Elements.add(llvm::ConstantExpr::getIntToPtr( |
1763 | 1 | llvm::ConstantInt::get(Int32Ty, ProtocolVersion), IdTy)); |
1764 | 1 | |
1765 | 1 | Elements.add(MakeConstantString(ProtocolName, ".objc_protocol_name")); |
1766 | 1 | Elements.add(ProtocolList); |
1767 | 1 | Elements.add(MethodList); |
1768 | 1 | Elements.add(MethodList); |
1769 | 1 | Elements.add(MethodList); |
1770 | 1 | Elements.add(MethodList); |
1771 | 1 | return Elements.finishAndCreateGlobal(".objc_protocol", |
1772 | 1 | CGM.getPointerAlign()); |
1773 | 1 | } |
1774 | | |
1775 | 2 | void CGObjCGNU::GenerateProtocol(const ObjCProtocolDecl *PD) { |
1776 | 2 | ASTContext &Context = CGM.getContext(); |
1777 | 2 | std::string ProtocolName = PD->getNameAsString(); |
1778 | 2 | |
1779 | 2 | // Use the protocol definition, if there is one. |
1780 | 2 | if (const ObjCProtocolDecl *Def = PD->getDefinition()) |
1781 | 2 | PD = Def; |
1782 | 2 | |
1783 | 2 | SmallVector<std::string, 16> Protocols; |
1784 | 2 | for (const auto *PI : PD->protocols()) |
1785 | 0 | Protocols.push_back(PI->getNameAsString()); |
1786 | 2 | SmallVector<llvm::Constant*, 16> InstanceMethodNames; |
1787 | 2 | SmallVector<llvm::Constant*, 16> InstanceMethodTypes; |
1788 | 2 | SmallVector<llvm::Constant*, 16> OptionalInstanceMethodNames; |
1789 | 2 | SmallVector<llvm::Constant*, 16> OptionalInstanceMethodTypes; |
1790 | 1 | for (const auto *I : PD->instance_methods()) { |
1791 | 1 | std::string TypeStr = Context.getObjCEncodingForMethodDecl(I); |
1792 | 1 | if (I->getImplementationControl() == ObjCMethodDecl::Optional1 ) { |
1793 | 0 | OptionalInstanceMethodNames.push_back( |
1794 | 0 | MakeConstantString(I->getSelector().getAsString())); |
1795 | 0 | OptionalInstanceMethodTypes.push_back(MakeConstantString(TypeStr)); |
1796 | 1 | } else { |
1797 | 1 | InstanceMethodNames.push_back( |
1798 | 1 | MakeConstantString(I->getSelector().getAsString())); |
1799 | 1 | InstanceMethodTypes.push_back(MakeConstantString(TypeStr)); |
1800 | 1 | } |
1801 | 1 | } |
1802 | 2 | // Collect information about class methods: |
1803 | 2 | SmallVector<llvm::Constant*, 16> ClassMethodNames; |
1804 | 2 | SmallVector<llvm::Constant*, 16> ClassMethodTypes; |
1805 | 2 | SmallVector<llvm::Constant*, 16> OptionalClassMethodNames; |
1806 | 2 | SmallVector<llvm::Constant*, 16> OptionalClassMethodTypes; |
1807 | 0 | for (const auto *I : PD->class_methods()) { |
1808 | 0 | std::string TypeStr = Context.getObjCEncodingForMethodDecl(I); |
1809 | 0 | if (I->getImplementationControl() == ObjCMethodDecl::Optional0 ) { |
1810 | 0 | OptionalClassMethodNames.push_back( |
1811 | 0 | MakeConstantString(I->getSelector().getAsString())); |
1812 | 0 | OptionalClassMethodTypes.push_back(MakeConstantString(TypeStr)); |
1813 | 0 | } else { |
1814 | 0 | ClassMethodNames.push_back( |
1815 | 0 | MakeConstantString(I->getSelector().getAsString())); |
1816 | 0 | ClassMethodTypes.push_back(MakeConstantString(TypeStr)); |
1817 | 0 | } |
1818 | 0 | } |
1819 | 2 | |
1820 | 2 | llvm::Constant *ProtocolList = GenerateProtocolList(Protocols); |
1821 | 2 | llvm::Constant *InstanceMethodList = |
1822 | 2 | GenerateProtocolMethodList(InstanceMethodNames, InstanceMethodTypes); |
1823 | 2 | llvm::Constant *ClassMethodList = |
1824 | 2 | GenerateProtocolMethodList(ClassMethodNames, ClassMethodTypes); |
1825 | 2 | llvm::Constant *OptionalInstanceMethodList = |
1826 | 2 | GenerateProtocolMethodList(OptionalInstanceMethodNames, |
1827 | 2 | OptionalInstanceMethodTypes); |
1828 | 2 | llvm::Constant *OptionalClassMethodList = |
1829 | 2 | GenerateProtocolMethodList(OptionalClassMethodNames, |
1830 | 2 | OptionalClassMethodTypes); |
1831 | 2 | |
1832 | 2 | // Property metadata: name, attributes, isSynthesized, setter name, setter |
1833 | 2 | // types, getter name, getter types. |
1834 | 2 | // The isSynthesized value is always set to 0 in a protocol. It exists to |
1835 | 2 | // simplify the runtime library by allowing it to use the same data |
1836 | 2 | // structures for protocol metadata everywhere. |
1837 | 2 | |
1838 | 2 | llvm::Constant *PropertyList; |
1839 | 2 | llvm::Constant *OptionalPropertyList; |
1840 | 2 | { |
1841 | 2 | llvm::StructType *propertyMetadataTy = |
1842 | 2 | llvm::StructType::get(CGM.getLLVMContext(), |
1843 | 2 | { PtrToInt8Ty, Int8Ty, Int8Ty, Int8Ty, Int8Ty, PtrToInt8Ty, |
1844 | 2 | PtrToInt8Ty, PtrToInt8Ty, PtrToInt8Ty }); |
1845 | 2 | |
1846 | 2 | unsigned numReqProperties = 0, numOptProperties = 0; |
1847 | 0 | for (auto property : PD->instance_properties()) { |
1848 | 0 | if (property->isOptional()) |
1849 | 0 | numOptProperties++; |
1850 | 0 | else |
1851 | 0 | numReqProperties++; |
1852 | 0 | } |
1853 | 2 | |
1854 | 2 | ConstantInitBuilder reqPropertyListBuilder(CGM); |
1855 | 2 | auto reqPropertiesList = reqPropertyListBuilder.beginStruct(); |
1856 | 2 | reqPropertiesList.addInt(IntTy, numReqProperties); |
1857 | 2 | reqPropertiesList.add(NULLPtr); |
1858 | 2 | auto reqPropertiesArray = reqPropertiesList.beginArray(propertyMetadataTy); |
1859 | 2 | |
1860 | 2 | ConstantInitBuilder optPropertyListBuilder(CGM); |
1861 | 2 | auto optPropertiesList = optPropertyListBuilder.beginStruct(); |
1862 | 2 | optPropertiesList.addInt(IntTy, numOptProperties); |
1863 | 2 | optPropertiesList.add(NULLPtr); |
1864 | 2 | auto optPropertiesArray = optPropertiesList.beginArray(propertyMetadataTy); |
1865 | 2 | |
1866 | 2 | // Add all of the property methods need adding to the method list and to the |
1867 | 2 | // property metadata list. |
1868 | 0 | for (auto *property : PD->instance_properties()) { |
1869 | 0 | auto &propertiesArray = |
1870 | 0 | (property->isOptional() ? optPropertiesArray0 : reqPropertiesArray0 ); |
1871 | 0 | auto fields = propertiesArray.beginStruct(propertyMetadataTy); |
1872 | 0 |
|
1873 | 0 | fields.add(MakePropertyEncodingString(property, nullptr)); |
1874 | 0 | PushPropertyAttributes(fields, property); |
1875 | 0 |
|
1876 | 0 | if (ObjCMethodDecl *getter0 = property->getGetterMethodDecl()) { |
1877 | 0 | std::string typeStr = Context.getObjCEncodingForMethodDecl(getter); |
1878 | 0 | llvm::Constant *typeEncoding = MakeConstantString(typeStr); |
1879 | 0 | InstanceMethodTypes.push_back(typeEncoding); |
1880 | 0 | fields.add(MakeConstantString(getter->getSelector().getAsString())); |
1881 | 0 | fields.add(typeEncoding); |
1882 | 0 | } else { |
1883 | 0 | fields.add(NULLPtr); |
1884 | 0 | fields.add(NULLPtr); |
1885 | 0 | } |
1886 | 0 | if (ObjCMethodDecl *setter0 = property->getSetterMethodDecl()) { |
1887 | 0 | std::string typeStr = Context.getObjCEncodingForMethodDecl(setter); |
1888 | 0 | llvm::Constant *typeEncoding = MakeConstantString(typeStr); |
1889 | 0 | InstanceMethodTypes.push_back(typeEncoding); |
1890 | 0 | fields.add(MakeConstantString(setter->getSelector().getAsString())); |
1891 | 0 | fields.add(typeEncoding); |
1892 | 0 | } else { |
1893 | 0 | fields.add(NULLPtr); |
1894 | 0 | fields.add(NULLPtr); |
1895 | 0 | } |
1896 | 0 |
|
1897 | 0 | fields.finishAndAddTo(propertiesArray); |
1898 | 0 | } |
1899 | 2 | |
1900 | 2 | reqPropertiesArray.finishAndAddTo(reqPropertiesList); |
1901 | 2 | PropertyList = |
1902 | 2 | reqPropertiesList.finishAndCreateGlobal(".objc_property_list", |
1903 | 2 | CGM.getPointerAlign()); |
1904 | 2 | |
1905 | 2 | optPropertiesArray.finishAndAddTo(optPropertiesList); |
1906 | 2 | OptionalPropertyList = |
1907 | 2 | optPropertiesList.finishAndCreateGlobal(".objc_property_list", |
1908 | 2 | CGM.getPointerAlign()); |
1909 | 2 | } |
1910 | 2 | |
1911 | 2 | // Protocols are objects containing lists of the methods implemented and |
1912 | 2 | // protocols adopted. |
1913 | 2 | // The isa pointer must be set to a magic number so the runtime knows it's |
1914 | 2 | // the correct layout. |
1915 | 2 | ConstantInitBuilder Builder(CGM); |
1916 | 2 | auto Elements = Builder.beginStruct(); |
1917 | 2 | Elements.add( |
1918 | 2 | llvm::ConstantExpr::getIntToPtr( |
1919 | 2 | llvm::ConstantInt::get(Int32Ty, ProtocolVersion), IdTy)); |
1920 | 2 | Elements.add( |
1921 | 2 | MakeConstantString(ProtocolName, ".objc_protocol_name")); |
1922 | 2 | Elements.add(ProtocolList); |
1923 | 2 | Elements.add(InstanceMethodList); |
1924 | 2 | Elements.add(ClassMethodList); |
1925 | 2 | Elements.add(OptionalInstanceMethodList); |
1926 | 2 | Elements.add(OptionalClassMethodList); |
1927 | 2 | Elements.add(PropertyList); |
1928 | 2 | Elements.add(OptionalPropertyList); |
1929 | 2 | ExistingProtocols[ProtocolName] = |
1930 | 2 | llvm::ConstantExpr::getBitCast( |
1931 | 2 | Elements.finishAndCreateGlobal(".objc_protocol", CGM.getPointerAlign()), |
1932 | 2 | IdTy); |
1933 | 2 | } |
1934 | 18 | void CGObjCGNU::GenerateProtocolHolderCategory() { |
1935 | 18 | // Collect information about instance methods |
1936 | 18 | SmallVector<Selector, 1> MethodSels; |
1937 | 18 | SmallVector<llvm::Constant*, 1> MethodTypes; |
1938 | 18 | |
1939 | 18 | ConstantInitBuilder Builder(CGM); |
1940 | 18 | auto Elements = Builder.beginStruct(); |
1941 | 18 | |
1942 | 18 | const std::string ClassName = "__ObjC_Protocol_Holder_Ugly_Hack"; |
1943 | 18 | const std::string CategoryName = "AnotherHack"; |
1944 | 18 | Elements.add(MakeConstantString(CategoryName)); |
1945 | 18 | Elements.add(MakeConstantString(ClassName)); |
1946 | 18 | // Instance method list |
1947 | 18 | Elements.addBitCast(GenerateMethodList( |
1948 | 18 | ClassName, CategoryName, MethodSels, MethodTypes, false), PtrTy); |
1949 | 18 | // Class method list |
1950 | 18 | Elements.addBitCast(GenerateMethodList( |
1951 | 18 | ClassName, CategoryName, MethodSels, MethodTypes, true), PtrTy); |
1952 | 18 | |
1953 | 18 | // Protocol list |
1954 | 18 | ConstantInitBuilder ProtocolListBuilder(CGM); |
1955 | 18 | auto ProtocolList = ProtocolListBuilder.beginStruct(); |
1956 | 18 | ProtocolList.add(NULLPtr); |
1957 | 18 | ProtocolList.addInt(LongTy, ExistingProtocols.size()); |
1958 | 18 | auto ProtocolElements = ProtocolList.beginArray(PtrTy); |
1959 | 18 | for (auto iter = ExistingProtocols.begin(), endIter = ExistingProtocols.end(); |
1960 | 20 | iter != endIter20 ; iter++2 ) { |
1961 | 2 | ProtocolElements.addBitCast(iter->getValue(), PtrTy); |
1962 | 2 | } |
1963 | 18 | ProtocolElements.finishAndAddTo(ProtocolList); |
1964 | 18 | Elements.addBitCast( |
1965 | 18 | ProtocolList.finishAndCreateGlobal(".objc_protocol_list", |
1966 | 18 | CGM.getPointerAlign()), |
1967 | 18 | PtrTy); |
1968 | 18 | Categories.push_back(llvm::ConstantExpr::getBitCast( |
1969 | 18 | Elements.finishAndCreateGlobal("", CGM.getPointerAlign()), |
1970 | 18 | PtrTy)); |
1971 | 18 | } |
1972 | | |
1973 | | /// Libobjc2 uses a bitfield representation where small(ish) bitfields are |
1974 | | /// stored in a 64-bit value with the low bit set to 1 and the remaining 63 |
1975 | | /// bits set to their values, LSB first, while larger ones are stored in a |
1976 | | /// structure of this / form: |
1977 | | /// |
1978 | | /// struct { int32_t length; int32_t values[length]; }; |
1979 | | /// |
1980 | | /// The values in the array are stored in host-endian format, with the least |
1981 | | /// significant bit being assumed to come first in the bitfield. Therefore, a |
1982 | | /// bitfield with the 64th bit set will be (int64_t)&{ 2, [0, 1<<31] }, while a |
1983 | | /// bitfield / with the 63rd bit set will be 1<<64. |
1984 | 32 | llvm::Constant *CGObjCGNU::MakeBitField(ArrayRef<bool> bits) { |
1985 | 32 | int bitCount = bits.size(); |
1986 | 32 | int ptrBits = CGM.getDataLayout().getPointerSizeInBits(); |
1987 | 32 | if (bitCount < ptrBits32 ) { |
1988 | 32 | uint64_t val = 1; |
1989 | 84 | for (int i=0 ; i<bitCount84 ; ++i52 ) { |
1990 | 52 | if (bits[i]52 ) val |= 1ULL<<(i+1)0 ; |
1991 | 52 | } |
1992 | 32 | return llvm::ConstantInt::get(IntPtrTy, val); |
1993 | 32 | } |
1994 | 0 | SmallVector<llvm::Constant *, 8> values; |
1995 | 0 | int v=0; |
1996 | 0 | while (v < bitCount0 ) { |
1997 | 0 | int32_t word = 0; |
1998 | 0 | for (int i=0 ; (i<32) && 0 (v<bitCount)0 ; ++i0 ) { |
1999 | 0 | if (bits[v]0 ) word |= 1<<i0 ; |
2000 | 0 | v++; |
2001 | 0 | } |
2002 | 0 | values.push_back(llvm::ConstantInt::get(Int32Ty, word)); |
2003 | 0 | } |
2004 | 0 |
|
2005 | 0 | ConstantInitBuilder builder(CGM); |
2006 | 0 | auto fields = builder.beginStruct(); |
2007 | 0 | fields.addInt(Int32Ty, values.size()); |
2008 | 0 | auto array = fields.beginArray(); |
2009 | 0 | for (auto v : values) array.add(v); |
2010 | 32 | array.finishAndAddTo(fields); |
2011 | 32 | |
2012 | 32 | llvm::Constant *GS = |
2013 | 32 | fields.finishAndCreateGlobal("", CharUnits::fromQuantity(4)); |
2014 | 32 | llvm::Constant *ptr = llvm::ConstantExpr::getPtrToInt(GS, IntPtrTy); |
2015 | 32 | return ptr; |
2016 | 32 | } |
2017 | | |
2018 | 1 | void CGObjCGNU::GenerateCategory(const ObjCCategoryImplDecl *OCD) { |
2019 | 1 | std::string ClassName = OCD->getClassInterface()->getNameAsString(); |
2020 | 1 | std::string CategoryName = OCD->getNameAsString(); |
2021 | 1 | // Collect information about instance methods |
2022 | 1 | SmallVector<Selector, 16> InstanceMethodSels; |
2023 | 1 | SmallVector<llvm::Constant*, 16> InstanceMethodTypes; |
2024 | 0 | for (const auto *I : OCD->instance_methods()) { |
2025 | 0 | InstanceMethodSels.push_back(I->getSelector()); |
2026 | 0 | std::string TypeStr = CGM.getContext().getObjCEncodingForMethodDecl(I); |
2027 | 0 | InstanceMethodTypes.push_back(MakeConstantString(TypeStr)); |
2028 | 0 | } |
2029 | 1 | |
2030 | 1 | // Collect information about class methods |
2031 | 1 | SmallVector<Selector, 16> ClassMethodSels; |
2032 | 1 | SmallVector<llvm::Constant*, 16> ClassMethodTypes; |
2033 | 0 | for (const auto *I : OCD->class_methods()) { |
2034 | 0 | ClassMethodSels.push_back(I->getSelector()); |
2035 | 0 | std::string TypeStr = CGM.getContext().getObjCEncodingForMethodDecl(I); |
2036 | 0 | ClassMethodTypes.push_back(MakeConstantString(TypeStr)); |
2037 | 0 | } |
2038 | 1 | |
2039 | 1 | // Collect the names of referenced protocols |
2040 | 1 | SmallVector<std::string, 16> Protocols; |
2041 | 1 | const ObjCCategoryDecl *CatDecl = OCD->getCategoryDecl(); |
2042 | 1 | const ObjCList<ObjCProtocolDecl> &Protos = CatDecl->getReferencedProtocols(); |
2043 | 1 | for (ObjCList<ObjCProtocolDecl>::iterator I = Protos.begin(), |
2044 | 1 | E = Protos.end(); I != E1 ; ++I0 ) |
2045 | 0 | Protocols.push_back((*I)->getNameAsString()); |
2046 | 1 | |
2047 | 1 | ConstantInitBuilder Builder(CGM); |
2048 | 1 | auto Elements = Builder.beginStruct(); |
2049 | 1 | Elements.add(MakeConstantString(CategoryName)); |
2050 | 1 | Elements.add(MakeConstantString(ClassName)); |
2051 | 1 | // Instance method list |
2052 | 1 | Elements.addBitCast( |
2053 | 1 | GenerateMethodList(ClassName, CategoryName, InstanceMethodSels, |
2054 | 1 | InstanceMethodTypes, false), |
2055 | 1 | PtrTy); |
2056 | 1 | // Class method list |
2057 | 1 | Elements.addBitCast( |
2058 | 1 | GenerateMethodList(ClassName, CategoryName, ClassMethodSels, |
2059 | 1 | ClassMethodTypes, true), |
2060 | 1 | PtrTy); |
2061 | 1 | // Protocol list |
2062 | 1 | Elements.addBitCast(GenerateProtocolList(Protocols), PtrTy); |
2063 | 1 | Categories.push_back(llvm::ConstantExpr::getBitCast( |
2064 | 1 | Elements.finishAndCreateGlobal("", CGM.getPointerAlign()), |
2065 | 1 | PtrTy)); |
2066 | 1 | } |
2067 | | |
2068 | | llvm::Constant *CGObjCGNU::GeneratePropertyList(const ObjCImplementationDecl *OID, |
2069 | | SmallVectorImpl<Selector> &InstanceMethodSels, |
2070 | 16 | SmallVectorImpl<llvm::Constant*> &InstanceMethodTypes) { |
2071 | 16 | ASTContext &Context = CGM.getContext(); |
2072 | 16 | // Property metadata: name, attributes, attributes2, padding1, padding2, |
2073 | 16 | // setter name, setter types, getter name, getter types. |
2074 | 16 | llvm::StructType *propertyMetadataTy = |
2075 | 16 | llvm::StructType::get(CGM.getLLVMContext(), |
2076 | 16 | { PtrToInt8Ty, Int8Ty, Int8Ty, Int8Ty, Int8Ty, PtrToInt8Ty, |
2077 | 16 | PtrToInt8Ty, PtrToInt8Ty, PtrToInt8Ty }); |
2078 | 16 | |
2079 | 16 | unsigned numProperties = 0; |
2080 | 12 | for (auto *propertyImpl : OID->property_impls()) { |
2081 | 12 | (void) propertyImpl; |
2082 | 12 | numProperties++; |
2083 | 12 | } |
2084 | 16 | |
2085 | 16 | ConstantInitBuilder builder(CGM); |
2086 | 16 | auto propertyList = builder.beginStruct(); |
2087 | 16 | propertyList.addInt(IntTy, numProperties); |
2088 | 16 | propertyList.add(NULLPtr); |
2089 | 16 | auto properties = propertyList.beginArray(propertyMetadataTy); |
2090 | 16 | |
2091 | 16 | // Add all of the property methods need adding to the method list and to the |
2092 | 16 | // property metadata list. |
2093 | 12 | for (auto *propertyImpl : OID->property_impls()) { |
2094 | 12 | auto fields = properties.beginStruct(propertyMetadataTy); |
2095 | 12 | ObjCPropertyDecl *property = propertyImpl->getPropertyDecl(); |
2096 | 12 | bool isSynthesized = (propertyImpl->getPropertyImplementation() == |
2097 | 12 | ObjCPropertyImplDecl::Synthesize); |
2098 | 12 | bool isDynamic = (propertyImpl->getPropertyImplementation() == |
2099 | 12 | ObjCPropertyImplDecl::Dynamic); |
2100 | 12 | |
2101 | 12 | fields.add(MakePropertyEncodingString(property, OID)); |
2102 | 12 | PushPropertyAttributes(fields, property, isSynthesized, isDynamic); |
2103 | 12 | if (ObjCMethodDecl *getter12 = property->getGetterMethodDecl()) { |
2104 | 12 | std::string TypeStr = Context.getObjCEncodingForMethodDecl(getter); |
2105 | 12 | llvm::Constant *TypeEncoding = MakeConstantString(TypeStr); |
2106 | 12 | if (isSynthesized12 ) { |
2107 | 11 | InstanceMethodTypes.push_back(TypeEncoding); |
2108 | 11 | InstanceMethodSels.push_back(getter->getSelector()); |
2109 | 11 | } |
2110 | 12 | fields.add(MakeConstantString(getter->getSelector().getAsString())); |
2111 | 12 | fields.add(TypeEncoding); |
2112 | 0 | } else { |
2113 | 0 | fields.add(NULLPtr); |
2114 | 0 | fields.add(NULLPtr); |
2115 | 0 | } |
2116 | 12 | if (ObjCMethodDecl *setter12 = property->getSetterMethodDecl()) { |
2117 | 11 | std::string TypeStr = Context.getObjCEncodingForMethodDecl(setter); |
2118 | 11 | llvm::Constant *TypeEncoding = MakeConstantString(TypeStr); |
2119 | 11 | if (isSynthesized11 ) { |
2120 | 11 | InstanceMethodTypes.push_back(TypeEncoding); |
2121 | 11 | InstanceMethodSels.push_back(setter->getSelector()); |
2122 | 11 | } |
2123 | 11 | fields.add(MakeConstantString(setter->getSelector().getAsString())); |
2124 | 11 | fields.add(TypeEncoding); |
2125 | 12 | } else { |
2126 | 1 | fields.add(NULLPtr); |
2127 | 1 | fields.add(NULLPtr); |
2128 | 1 | } |
2129 | 12 | fields.finishAndAddTo(properties); |
2130 | 12 | } |
2131 | 16 | properties.finishAndAddTo(propertyList); |
2132 | 16 | |
2133 | 16 | return propertyList.finishAndCreateGlobal(".objc_property_list", |
2134 | 16 | CGM.getPointerAlign()); |
2135 | 16 | } |
2136 | | |
2137 | 0 | void CGObjCGNU::RegisterAlias(const ObjCCompatibleAliasDecl *OAD) { |
2138 | 0 | // Get the class declaration for which the alias is specified. |
2139 | 0 | ObjCInterfaceDecl *ClassDecl = |
2140 | 0 | const_cast<ObjCInterfaceDecl *>(OAD->getClassInterface()); |
2141 | 0 | ClassAliases.emplace_back(ClassDecl->getNameAsString(), |
2142 | 0 | OAD->getNameAsString()); |
2143 | 0 | } |
2144 | | |
2145 | 16 | void CGObjCGNU::GenerateClass(const ObjCImplementationDecl *OID) { |
2146 | 16 | ASTContext &Context = CGM.getContext(); |
2147 | 16 | |
2148 | 16 | // Get the superclass name. |
2149 | 16 | const ObjCInterfaceDecl * SuperClassDecl = |
2150 | 16 | OID->getClassInterface()->getSuperClass(); |
2151 | 16 | std::string SuperClassName; |
2152 | 16 | if (SuperClassDecl16 ) { |
2153 | 7 | SuperClassName = SuperClassDecl->getNameAsString(); |
2154 | 7 | EmitClassRef(SuperClassName); |
2155 | 7 | } |
2156 | 16 | |
2157 | 16 | // Get the class name |
2158 | 16 | ObjCInterfaceDecl *ClassDecl = |
2159 | 16 | const_cast<ObjCInterfaceDecl *>(OID->getClassInterface()); |
2160 | 16 | std::string ClassName = ClassDecl->getNameAsString(); |
2161 | 16 | |
2162 | 16 | // Emit the symbol that is used to generate linker errors if this class is |
2163 | 16 | // referenced in other modules but not declared. |
2164 | 16 | std::string classSymbolName = "__objc_class_name_" + ClassName; |
2165 | 16 | if (auto *symbol16 = TheModule.getGlobalVariable(classSymbolName)) { |
2166 | 0 | symbol->setInitializer(llvm::ConstantInt::get(LongTy, 0)); |
2167 | 16 | } else { |
2168 | 16 | new llvm::GlobalVariable(TheModule, LongTy, false, |
2169 | 16 | llvm::GlobalValue::ExternalLinkage, |
2170 | 16 | llvm::ConstantInt::get(LongTy, 0), |
2171 | 16 | classSymbolName); |
2172 | 16 | } |
2173 | 16 | |
2174 | 16 | // Get the size of instances. |
2175 | 16 | int instanceSize = |
2176 | 16 | Context.getASTObjCImplementationLayout(OID).getSize().getQuantity(); |
2177 | 16 | |
2178 | 16 | // Collect information about instance variables. |
2179 | 16 | SmallVector<llvm::Constant*, 16> IvarNames; |
2180 | 16 | SmallVector<llvm::Constant*, 16> IvarTypes; |
2181 | 16 | SmallVector<llvm::Constant*, 16> IvarOffsets; |
2182 | 16 | |
2183 | 16 | ConstantInitBuilder IvarOffsetBuilder(CGM); |
2184 | 16 | auto IvarOffsetValues = IvarOffsetBuilder.beginArray(PtrToIntTy); |
2185 | 16 | SmallVector<bool, 16> WeakIvars; |
2186 | 16 | SmallVector<bool, 16> StrongIvars; |
2187 | 16 | |
2188 | 9 | int superInstanceSize = !SuperClassDecl ? 0 : |
2189 | 7 | Context.getASTObjCInterfaceLayout(SuperClassDecl).getSize().getQuantity(); |
2190 | 16 | // For non-fragile ivars, set the instance size to 0 - {the size of just this |
2191 | 16 | // class}. The runtime will then set this to the correct value on load. |
2192 | 16 | if (CGM.getLangOpts().ObjCRuntime.isNonFragile()16 ) { |
2193 | 9 | instanceSize = 0 - (instanceSize - superInstanceSize); |
2194 | 9 | } |
2195 | 16 | |
2196 | 42 | for (const ObjCIvarDecl *IVD = ClassDecl->all_declared_ivar_begin(); IVD; |
2197 | 26 | IVD = IVD->getNextIvar()26 ) { |
2198 | 26 | // Store the name |
2199 | 26 | IvarNames.push_back(MakeConstantString(IVD->getNameAsString())); |
2200 | 26 | // Get the type encoding for this ivar |
2201 | 26 | std::string TypeStr; |
2202 | 26 | Context.getObjCEncodingForType(IVD->getType(), TypeStr, IVD); |
2203 | 26 | IvarTypes.push_back(MakeConstantString(TypeStr)); |
2204 | 26 | // Get the offset |
2205 | 26 | uint64_t BaseOffset = ComputeIvarBaseOffset(CGM, OID, IVD); |
2206 | 26 | uint64_t Offset = BaseOffset; |
2207 | 26 | if (CGM.getLangOpts().ObjCRuntime.isNonFragile()26 ) { |
2208 | 15 | Offset = BaseOffset - superInstanceSize; |
2209 | 15 | } |
2210 | 26 | llvm::Constant *OffsetValue = llvm::ConstantInt::get(IntTy, Offset); |
2211 | 26 | // Create the direct offset value |
2212 | 26 | std::string OffsetName = "__objc_ivar_offset_value_" + ClassName +"." + |
2213 | 26 | IVD->getNameAsString(); |
2214 | 26 | llvm::GlobalVariable *OffsetVar = TheModule.getGlobalVariable(OffsetName); |
2215 | 26 | if (OffsetVar26 ) { |
2216 | 2 | OffsetVar->setInitializer(OffsetValue); |
2217 | 2 | // If this is the real definition, change its linkage type so that |
2218 | 2 | // different modules will use this one, rather than their private |
2219 | 2 | // copy. |
2220 | 2 | OffsetVar->setLinkage(llvm::GlobalValue::ExternalLinkage); |
2221 | 2 | } else |
2222 | 24 | OffsetVar = new llvm::GlobalVariable(TheModule, IntTy, |
2223 | 24 | false, llvm::GlobalValue::ExternalLinkage, |
2224 | 24 | OffsetValue, |
2225 | 24 | "__objc_ivar_offset_value_" + ClassName +"." + |
2226 | 24 | IVD->getNameAsString()); |
2227 | 26 | IvarOffsets.push_back(OffsetValue); |
2228 | 26 | IvarOffsetValues.add(OffsetVar); |
2229 | 26 | Qualifiers::ObjCLifetime lt = IVD->getType().getQualifiers().getObjCLifetime(); |
2230 | 26 | switch (lt) { |
2231 | 0 | case Qualifiers::OCL_Strong: |
2232 | 0 | StrongIvars.push_back(true); |
2233 | 0 | WeakIvars.push_back(false); |
2234 | 0 | break; |
2235 | 0 | case Qualifiers::OCL_Weak: |
2236 | 0 | StrongIvars.push_back(false); |
2237 | 0 | WeakIvars.push_back(true); |
2238 | 0 | break; |
2239 | 26 | default: |
2240 | 26 | StrongIvars.push_back(false); |
2241 | 26 | WeakIvars.push_back(false); |
2242 | 26 | } |
2243 | 26 | } |
2244 | 16 | llvm::Constant *StrongIvarBitmap = MakeBitField(StrongIvars); |
2245 | 16 | llvm::Constant *WeakIvarBitmap = MakeBitField(WeakIvars); |
2246 | 16 | llvm::GlobalVariable *IvarOffsetArray = |
2247 | 16 | IvarOffsetValues.finishAndCreateGlobal(".ivar.offsets", |
2248 | 16 | CGM.getPointerAlign()); |
2249 | 16 | |
2250 | 16 | // Collect information about instance methods |
2251 | 16 | SmallVector<Selector, 16> InstanceMethodSels; |
2252 | 16 | SmallVector<llvm::Constant*, 16> InstanceMethodTypes; |
2253 | 5 | for (const auto *I : OID->instance_methods()) { |
2254 | 5 | InstanceMethodSels.push_back(I->getSelector()); |
2255 | 5 | std::string TypeStr = Context.getObjCEncodingForMethodDecl(I); |
2256 | 5 | InstanceMethodTypes.push_back(MakeConstantString(TypeStr)); |
2257 | 5 | } |
2258 | 16 | |
2259 | 16 | llvm::Constant *Properties = GeneratePropertyList(OID, InstanceMethodSels, |
2260 | 16 | InstanceMethodTypes); |
2261 | 16 | |
2262 | 16 | // Collect information about class methods |
2263 | 16 | SmallVector<Selector, 16> ClassMethodSels; |
2264 | 16 | SmallVector<llvm::Constant*, 16> ClassMethodTypes; |
2265 | 1 | for (const auto *I : OID->class_methods()) { |
2266 | 1 | ClassMethodSels.push_back(I->getSelector()); |
2267 | 1 | std::string TypeStr = Context.getObjCEncodingForMethodDecl(I); |
2268 | 1 | ClassMethodTypes.push_back(MakeConstantString(TypeStr)); |
2269 | 1 | } |
2270 | 16 | // Collect the names of referenced protocols |
2271 | 16 | SmallVector<std::string, 16> Protocols; |
2272 | 16 | for (const auto *I : ClassDecl->protocols()) |
2273 | 2 | Protocols.push_back(I->getNameAsString()); |
2274 | 16 | |
2275 | 16 | // Get the superclass pointer. |
2276 | 16 | llvm::Constant *SuperClass; |
2277 | 16 | if (!SuperClassName.empty()16 ) { |
2278 | 7 | SuperClass = MakeConstantString(SuperClassName, ".super_class_name"); |
2279 | 16 | } else { |
2280 | 9 | SuperClass = llvm::ConstantPointerNull::get(PtrToInt8Ty); |
2281 | 9 | } |
2282 | 16 | // Empty vector used to construct empty method lists |
2283 | 16 | SmallVector<llvm::Constant*, 1> empty; |
2284 | 16 | // Generate the method and instance variable lists |
2285 | 16 | llvm::Constant *MethodList = GenerateMethodList(ClassName, "", |
2286 | 16 | InstanceMethodSels, InstanceMethodTypes, false); |
2287 | 16 | llvm::Constant *ClassMethodList = GenerateMethodList(ClassName, "", |
2288 | 16 | ClassMethodSels, ClassMethodTypes, true); |
2289 | 16 | llvm::Constant *IvarList = GenerateIvarList(IvarNames, IvarTypes, |
2290 | 16 | IvarOffsets); |
2291 | 16 | // Irrespective of whether we are compiling for a fragile or non-fragile ABI, |
2292 | 16 | // we emit a symbol containing the offset for each ivar in the class. This |
2293 | 16 | // allows code compiled for the non-Fragile ABI to inherit from code compiled |
2294 | 16 | // for the legacy ABI, without causing problems. The converse is also |
2295 | 16 | // possible, but causes all ivar accesses to be fragile. |
2296 | 16 | |
2297 | 16 | // Offset pointer for getting at the correct field in the ivar list when |
2298 | 16 | // setting up the alias. These are: The base address for the global, the |
2299 | 16 | // ivar array (second field), the ivar in this list (set for each ivar), and |
2300 | 16 | // the offset (third field in ivar structure) |
2301 | 16 | llvm::Type *IndexTy = Int32Ty; |
2302 | 16 | llvm::Constant *offsetPointerIndexes[] = {Zeros[0], |
2303 | 16 | llvm::ConstantInt::get(IndexTy, 1), nullptr, |
2304 | 16 | llvm::ConstantInt::get(IndexTy, 2) }; |
2305 | 16 | |
2306 | 16 | unsigned ivarIndex = 0; |
2307 | 42 | for (const ObjCIvarDecl *IVD = ClassDecl->all_declared_ivar_begin(); IVD; |
2308 | 26 | IVD = IVD->getNextIvar()26 ) { |
2309 | 26 | const std::string Name = "__objc_ivar_offset_" + ClassName + '.' |
2310 | 26 | + IVD->getNameAsString(); |
2311 | 26 | offsetPointerIndexes[2] = llvm::ConstantInt::get(IndexTy, ivarIndex); |
2312 | 26 | // Get the correct ivar field |
2313 | 26 | llvm::Constant *offsetValue = llvm::ConstantExpr::getGetElementPtr( |
2314 | 26 | cast<llvm::GlobalVariable>(IvarList)->getValueType(), IvarList, |
2315 | 26 | offsetPointerIndexes); |
2316 | 26 | // Get the existing variable, if one exists. |
2317 | 26 | llvm::GlobalVariable *offset = TheModule.getNamedGlobal(Name); |
2318 | 26 | if (offset26 ) { |
2319 | 10 | offset->setInitializer(offsetValue); |
2320 | 10 | // If this is the real definition, change its linkage type so that |
2321 | 10 | // different modules will use this one, rather than their private |
2322 | 10 | // copy. |
2323 | 10 | offset->setLinkage(llvm::GlobalValue::ExternalLinkage); |
2324 | 26 | } else { |
2325 | 16 | // Add a new alias if there isn't one already. |
2326 | 16 | offset = new llvm::GlobalVariable(TheModule, offsetValue->getType(), |
2327 | 16 | false, llvm::GlobalValue::ExternalLinkage, offsetValue, Name); |
2328 | 16 | (void) offset; // Silence dead store warning. |
2329 | 16 | } |
2330 | 26 | ++ivarIndex; |
2331 | 26 | } |
2332 | 16 | llvm::Constant *ZeroPtr = llvm::ConstantInt::get(IntPtrTy, 0); |
2333 | 16 | |
2334 | 16 | //Generate metaclass for class methods |
2335 | 16 | llvm::Constant *MetaClassStruct = GenerateClassStructure( |
2336 | 16 | NULLPtr, NULLPtr, 0x12L, ClassName.c_str(), nullptr, Zeros[0], |
2337 | 16 | GenerateIvarList(empty, empty, empty), ClassMethodList, NULLPtr, NULLPtr, |
2338 | 16 | NULLPtr, ZeroPtr, ZeroPtr, true); |
2339 | 16 | if (CGM.getTriple().isOSBinFormatCOFF()16 ) { |
2340 | 5 | auto Storage = llvm::GlobalValue::DefaultStorageClass; |
2341 | 5 | if (OID->getClassInterface()->hasAttr<DLLImportAttr>()) |
2342 | 0 | Storage = llvm::GlobalValue::DLLImportStorageClass; |
2343 | 5 | else if (5 OID->getClassInterface()->hasAttr<DLLExportAttr>()5 ) |
2344 | 3 | Storage = llvm::GlobalValue::DLLExportStorageClass; |
2345 | 5 | cast<llvm::GlobalValue>(MetaClassStruct)->setDLLStorageClass(Storage); |
2346 | 5 | } |
2347 | 16 | |
2348 | 16 | // Generate the class structure |
2349 | 16 | llvm::Constant *ClassStruct = GenerateClassStructure( |
2350 | 16 | MetaClassStruct, SuperClass, 0x11L, ClassName.c_str(), nullptr, |
2351 | 16 | llvm::ConstantInt::get(LongTy, instanceSize), IvarList, MethodList, |
2352 | 16 | GenerateProtocolList(Protocols), IvarOffsetArray, Properties, |
2353 | 16 | StrongIvarBitmap, WeakIvarBitmap); |
2354 | 16 | if (CGM.getTriple().isOSBinFormatCOFF()16 ) { |
2355 | 5 | auto Storage = llvm::GlobalValue::DefaultStorageClass; |
2356 | 5 | if (OID->getClassInterface()->hasAttr<DLLImportAttr>()) |
2357 | 0 | Storage = llvm::GlobalValue::DLLImportStorageClass; |
2358 | 5 | else if (5 OID->getClassInterface()->hasAttr<DLLExportAttr>()5 ) |
2359 | 3 | Storage = llvm::GlobalValue::DLLExportStorageClass; |
2360 | 5 | cast<llvm::GlobalValue>(ClassStruct)->setDLLStorageClass(Storage); |
2361 | 5 | } |
2362 | 16 | |
2363 | 16 | // Resolve the class aliases, if they exist. |
2364 | 16 | if (ClassPtrAlias16 ) { |
2365 | 1 | ClassPtrAlias->replaceAllUsesWith( |
2366 | 1 | llvm::ConstantExpr::getBitCast(ClassStruct, IdTy)); |
2367 | 1 | ClassPtrAlias->eraseFromParent(); |
2368 | 1 | ClassPtrAlias = nullptr; |
2369 | 1 | } |
2370 | 16 | if (MetaClassPtrAlias16 ) { |
2371 | 1 | MetaClassPtrAlias->replaceAllUsesWith( |
2372 | 1 | llvm::ConstantExpr::getBitCast(MetaClassStruct, IdTy)); |
2373 | 1 | MetaClassPtrAlias->eraseFromParent(); |
2374 | 1 | MetaClassPtrAlias = nullptr; |
2375 | 1 | } |
2376 | 16 | |
2377 | 16 | // Add class structure to list to be added to the symtab later |
2378 | 16 | ClassStruct = llvm::ConstantExpr::getBitCast(ClassStruct, PtrToInt8Ty); |
2379 | 16 | Classes.push_back(ClassStruct); |
2380 | 16 | } |
2381 | | |
2382 | 23 | llvm::Function *CGObjCGNU::ModuleInitFunction() { |
2383 | 23 | // Only emit an ObjC load function if no Objective-C stuff has been called |
2384 | 23 | if (Classes.empty() && 23 Categories.empty()12 && ConstantStrings.empty()12 && |
2385 | 23 | ExistingProtocols.empty()10 && SelectorTable.empty()10 ) |
2386 | 5 | return nullptr; |
2387 | 18 | |
2388 | 18 | // Add all referenced protocols to a category. |
2389 | 18 | GenerateProtocolHolderCategory(); |
2390 | 18 | |
2391 | 18 | llvm::StructType *selStructTy = |
2392 | 18 | dyn_cast<llvm::StructType>(SelectorTy->getElementType()); |
2393 | 18 | llvm::Type *selStructPtrTy = SelectorTy; |
2394 | 18 | if (!selStructTy18 ) { |
2395 | 18 | selStructTy = llvm::StructType::get(CGM.getLLVMContext(), |
2396 | 18 | { PtrToInt8Ty, PtrToInt8Ty }); |
2397 | 18 | selStructPtrTy = llvm::PointerType::getUnqual(selStructTy); |
2398 | 18 | } |
2399 | 18 | |
2400 | 18 | // Generate statics list: |
2401 | 18 | llvm::Constant *statics = NULLPtr; |
2402 | 18 | if (!ConstantStrings.empty()18 ) { |
2403 | 3 | llvm::GlobalVariable *fileStatics = [&] { |
2404 | 3 | ConstantInitBuilder builder(CGM); |
2405 | 3 | auto staticsStruct = builder.beginStruct(); |
2406 | 3 | |
2407 | 3 | StringRef stringClass = CGM.getLangOpts().ObjCConstantStringClass; |
2408 | 3 | if (stringClass.empty()3 ) stringClass = "NXConstantString"2 ; |
2409 | 3 | staticsStruct.add(MakeConstantString(stringClass, |
2410 | 3 | ".objc_static_class_name")); |
2411 | 3 | |
2412 | 3 | auto array = staticsStruct.beginArray(); |
2413 | 3 | array.addAll(ConstantStrings); |
2414 | 3 | array.add(NULLPtr); |
2415 | 3 | array.finishAndAddTo(staticsStruct); |
2416 | 3 | |
2417 | 3 | return staticsStruct.finishAndCreateGlobal(".objc_statics", |
2418 | 3 | CGM.getPointerAlign()); |
2419 | 3 | }(); |
2420 | 3 | |
2421 | 3 | ConstantInitBuilder builder(CGM); |
2422 | 3 | auto allStaticsArray = builder.beginArray(fileStatics->getType()); |
2423 | 3 | allStaticsArray.add(fileStatics); |
2424 | 3 | allStaticsArray.addNullPointer(fileStatics->getType()); |
2425 | 3 | |
2426 | 3 | statics = allStaticsArray.finishAndCreateGlobal(".objc_statics_ptr", |
2427 | 3 | CGM.getPointerAlign()); |
2428 | 3 | statics = llvm::ConstantExpr::getBitCast(statics, PtrTy); |
2429 | 3 | } |
2430 | 18 | |
2431 | 18 | // Array of classes, categories, and constant objects. |
2432 | 18 | |
2433 | 18 | SmallVector<llvm::GlobalAlias*, 16> selectorAliases; |
2434 | 18 | unsigned selectorCount; |
2435 | 18 | |
2436 | 18 | // Pointer to an array of selectors used in this module. |
2437 | 18 | llvm::GlobalVariable *selectorList = [&] { |
2438 | 18 | ConstantInitBuilder builder(CGM); |
2439 | 18 | auto selectors = builder.beginArray(selStructTy); |
2440 | 18 | auto &table = SelectorTable; // MSVC workaround |
2441 | 19 | for (auto &entry : table) { |
2442 | 19 | |
2443 | 19 | std::string selNameStr = entry.first.getAsString(); |
2444 | 19 | llvm::Constant *selName = ExportUniqueString(selNameStr, ".objc_sel_name"); |
2445 | 19 | |
2446 | 19 | for (TypedSelector &sel : entry.second) { |
2447 | 19 | llvm::Constant *selectorTypeEncoding = NULLPtr; |
2448 | 19 | if (!sel.first.empty()) |
2449 | 5 | selectorTypeEncoding = |
2450 | 5 | MakeConstantString(sel.first, ".objc_sel_types"); |
2451 | 19 | |
2452 | 19 | auto selStruct = selectors.beginStruct(selStructTy); |
2453 | 19 | selStruct.add(selName); |
2454 | 19 | selStruct.add(selectorTypeEncoding); |
2455 | 19 | selStruct.finishAndAddTo(selectors); |
2456 | 19 | |
2457 | 19 | // Store the selector alias for later replacement |
2458 | 19 | selectorAliases.push_back(sel.second); |
2459 | 19 | } |
2460 | 19 | } |
2461 | 18 | |
2462 | 18 | // Remember the number of entries in the selector table. |
2463 | 18 | selectorCount = selectors.size(); |
2464 | 18 | |
2465 | 18 | // NULL-terminate the selector list. This should not actually be required, |
2466 | 18 | // because the selector list has a length field. Unfortunately, the GCC |
2467 | 18 | // runtime decides to ignore the length field and expects a NULL terminator, |
2468 | 18 | // and GCC cooperates with this by always setting the length to 0. |
2469 | 18 | auto selStruct = selectors.beginStruct(selStructTy); |
2470 | 18 | selStruct.add(NULLPtr); |
2471 | 18 | selStruct.add(NULLPtr); |
2472 | 18 | selStruct.finishAndAddTo(selectors); |
2473 | 18 | |
2474 | 18 | return selectors.finishAndCreateGlobal(".objc_selector_list", |
2475 | 18 | CGM.getPointerAlign()); |
2476 | 18 | }(); |
2477 | 18 | |
2478 | 18 | // Now that all of the static selectors exist, create pointers to them. |
2479 | 37 | for (unsigned i = 0; i < selectorCount37 ; ++i19 ) { |
2480 | 19 | llvm::Constant *idxs[] = { |
2481 | 19 | Zeros[0], |
2482 | 19 | llvm::ConstantInt::get(Int32Ty, i) |
2483 | 19 | }; |
2484 | 19 | // FIXME: We're generating redundant loads and stores here! |
2485 | 19 | llvm::Constant *selPtr = llvm::ConstantExpr::getGetElementPtr( |
2486 | 19 | selectorList->getValueType(), selectorList, idxs); |
2487 | 19 | // If selectors are defined as an opaque type, cast the pointer to this |
2488 | 19 | // type. |
2489 | 19 | selPtr = llvm::ConstantExpr::getBitCast(selPtr, SelectorTy); |
2490 | 19 | selectorAliases[i]->replaceAllUsesWith(selPtr); |
2491 | 19 | selectorAliases[i]->eraseFromParent(); |
2492 | 19 | } |
2493 | 18 | |
2494 | 18 | llvm::GlobalVariable *symtab = [&] { |
2495 | 18 | ConstantInitBuilder builder(CGM); |
2496 | 18 | auto symtab = builder.beginStruct(); |
2497 | 18 | |
2498 | 18 | // Number of static selectors |
2499 | 18 | symtab.addInt(LongTy, selectorCount); |
2500 | 18 | |
2501 | 18 | symtab.addBitCast(selectorList, selStructPtrTy); |
2502 | 18 | |
2503 | 18 | // Number of classes defined. |
2504 | 18 | symtab.addInt(CGM.Int16Ty, Classes.size()); |
2505 | 18 | // Number of categories defined |
2506 | 18 | symtab.addInt(CGM.Int16Ty, Categories.size()); |
2507 | 18 | |
2508 | 18 | // Create an array of classes, then categories, then static object instances |
2509 | 18 | auto classList = symtab.beginArray(PtrToInt8Ty); |
2510 | 18 | classList.addAll(Classes); |
2511 | 18 | classList.addAll(Categories); |
2512 | 18 | // NULL-terminated list of static object instances (mainly constant strings) |
2513 | 18 | classList.add(statics); |
2514 | 18 | classList.add(NULLPtr); |
2515 | 18 | classList.finishAndAddTo(symtab); |
2516 | 18 | |
2517 | 18 | // Construct the symbol table. |
2518 | 18 | return symtab.finishAndCreateGlobal("", CGM.getPointerAlign()); |
2519 | 18 | }(); |
2520 | 18 | |
2521 | 18 | // The symbol table is contained in a module which has some version-checking |
2522 | 18 | // constants |
2523 | 18 | llvm::Constant *module = [&] { |
2524 | 18 | llvm::Type *moduleEltTys[] = { |
2525 | 18 | LongTy, LongTy, PtrToInt8Ty, symtab->getType(), IntTy |
2526 | 18 | }; |
2527 | 18 | llvm::StructType *moduleTy = |
2528 | 18 | llvm::StructType::get(CGM.getLLVMContext(), |
2529 | 18 | makeArrayRef(moduleEltTys).drop_back(unsigned(RuntimeVersion < 10))); |
2530 | 18 | |
2531 | 18 | ConstantInitBuilder builder(CGM); |
2532 | 18 | auto module = builder.beginStruct(moduleTy); |
2533 | 18 | // Runtime version, used for ABI compatibility checking. |
2534 | 18 | module.addInt(LongTy, RuntimeVersion); |
2535 | 18 | // sizeof(ModuleTy) |
2536 | 18 | module.addInt(LongTy, CGM.getDataLayout().getTypeStoreSize(moduleTy)); |
2537 | 18 | |
2538 | 18 | // The path to the source file where this module was declared |
2539 | 18 | SourceManager &SM = CGM.getContext().getSourceManager(); |
2540 | 18 | const FileEntry *mainFile = SM.getFileEntryForID(SM.getMainFileID()); |
2541 | 18 | std::string path = |
2542 | 18 | (Twine(mainFile->getDir()->getName()) + "/" + mainFile->getName()).str(); |
2543 | 18 | module.add(MakeConstantString(path, ".objc_source_file_name")); |
2544 | 18 | module.add(symtab); |
2545 | 18 | |
2546 | 18 | if (RuntimeVersion >= 1018 ) { |
2547 | 1 | switch (CGM.getLangOpts().getGC()) { |
2548 | 0 | case LangOptions::GCOnly: |
2549 | 0 | module.addInt(IntTy, 2); |
2550 | 0 | break; |
2551 | 1 | case LangOptions::NonGC: |
2552 | 1 | if (CGM.getLangOpts().ObjCAutoRefCount) |
2553 | 1 | module.addInt(IntTy, 1); |
2554 | 1 | else |
2555 | 0 | module.addInt(IntTy, 0); |
2556 | 1 | break; |
2557 | 0 | case LangOptions::HybridGC: |
2558 | 0 | module.addInt(IntTy, 1); |
2559 | 0 | break; |
2560 | 18 | } |
2561 | 18 | } |
2562 | 18 | |
2563 | 18 | return module.finishAndCreateGlobal("", CGM.getPointerAlign()); |
2564 | 18 | }(); |
2565 | 18 | |
2566 | 18 | // Create the load function calling the runtime entry point with the module |
2567 | 18 | // structure |
2568 | 18 | llvm::Function * LoadFunction = llvm::Function::Create( |
2569 | 18 | llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), false), |
2570 | 18 | llvm::GlobalValue::InternalLinkage, ".objc_load_function", |
2571 | 18 | &TheModule); |
2572 | 18 | llvm::BasicBlock *EntryBB = |
2573 | 18 | llvm::BasicBlock::Create(VMContext, "entry", LoadFunction); |
2574 | 18 | CGBuilderTy Builder(CGM, VMContext); |
2575 | 18 | Builder.SetInsertPoint(EntryBB); |
2576 | 18 | |
2577 | 18 | llvm::FunctionType *FT = |
2578 | 18 | llvm::FunctionType::get(Builder.getVoidTy(), module->getType(), true); |
2579 | 18 | llvm::Value *Register = CGM.CreateRuntimeFunction(FT, "__objc_exec_class"); |
2580 | 18 | Builder.CreateCall(Register, module); |
2581 | 18 | |
2582 | 18 | if (!ClassAliases.empty()18 ) { |
2583 | 0 | llvm::Type *ArgTypes[2] = {PtrTy, PtrToInt8Ty}; |
2584 | 0 | llvm::FunctionType *RegisterAliasTy = |
2585 | 0 | llvm::FunctionType::get(Builder.getVoidTy(), |
2586 | 0 | ArgTypes, false); |
2587 | 0 | llvm::Function *RegisterAlias = llvm::Function::Create( |
2588 | 0 | RegisterAliasTy, |
2589 | 0 | llvm::GlobalValue::ExternalWeakLinkage, "class_registerAlias_np", |
2590 | 0 | &TheModule); |
2591 | 0 | llvm::BasicBlock *AliasBB = |
2592 | 0 | llvm::BasicBlock::Create(VMContext, "alias", LoadFunction); |
2593 | 0 | llvm::BasicBlock *NoAliasBB = |
2594 | 0 | llvm::BasicBlock::Create(VMContext, "no_alias", LoadFunction); |
2595 | 0 |
|
2596 | 0 | // Branch based on whether the runtime provided class_registerAlias_np() |
2597 | 0 | llvm::Value *HasRegisterAlias = Builder.CreateICmpNE(RegisterAlias, |
2598 | 0 | llvm::Constant::getNullValue(RegisterAlias->getType())); |
2599 | 0 | Builder.CreateCondBr(HasRegisterAlias, AliasBB, NoAliasBB); |
2600 | 0 |
|
2601 | 0 | // The true branch (has alias registration function): |
2602 | 0 | Builder.SetInsertPoint(AliasBB); |
2603 | 0 | // Emit alias registration calls: |
2604 | 0 | for (std::vector<ClassAliasPair>::iterator iter = ClassAliases.begin(); |
2605 | 0 | iter != ClassAliases.end()0 ; ++iter0 ) { |
2606 | 0 | llvm::Constant *TheClass = |
2607 | 0 | TheModule.getGlobalVariable("_OBJC_CLASS_" + iter->first, true); |
2608 | 0 | if (TheClass0 ) { |
2609 | 0 | TheClass = llvm::ConstantExpr::getBitCast(TheClass, PtrTy); |
2610 | 0 | Builder.CreateCall(RegisterAlias, |
2611 | 0 | {TheClass, MakeConstantString(iter->second)}); |
2612 | 0 | } |
2613 | 0 | } |
2614 | 0 | // Jump to end: |
2615 | 0 | Builder.CreateBr(NoAliasBB); |
2616 | 0 |
|
2617 | 0 | // Missing alias registration function, just return from the function: |
2618 | 0 | Builder.SetInsertPoint(NoAliasBB); |
2619 | 0 | } |
2620 | 23 | Builder.CreateRetVoid(); |
2621 | 23 | |
2622 | 23 | return LoadFunction; |
2623 | 23 | } |
2624 | | |
2625 | | llvm::Function *CGObjCGNU::GenerateMethod(const ObjCMethodDecl *OMD, |
2626 | 28 | const ObjCContainerDecl *CD) { |
2627 | 28 | const ObjCCategoryImplDecl *OCD = |
2628 | 28 | dyn_cast<ObjCCategoryImplDecl>(OMD->getDeclContext()); |
2629 | 28 | StringRef CategoryName = OCD ? OCD->getName()0 : ""28 ; |
2630 | 28 | StringRef ClassName = CD->getName(); |
2631 | 28 | Selector MethodName = OMD->getSelector(); |
2632 | 28 | bool isClassMethod = !OMD->isInstanceMethod(); |
2633 | 28 | |
2634 | 28 | CodeGenTypes &Types = CGM.getTypes(); |
2635 | 28 | llvm::FunctionType *MethodTy = |
2636 | 28 | Types.GetFunctionType(Types.arrangeObjCMethodDeclaration(OMD)); |
2637 | 28 | std::string FunctionName = SymbolNameForMethod(ClassName, CategoryName, |
2638 | 28 | MethodName, isClassMethod); |
2639 | 28 | |
2640 | 28 | llvm::Function *Method |
2641 | 28 | = llvm::Function::Create(MethodTy, |
2642 | 28 | llvm::GlobalValue::InternalLinkage, |
2643 | 28 | FunctionName, |
2644 | 28 | &TheModule); |
2645 | 28 | return Method; |
2646 | 28 | } |
2647 | | |
2648 | 3 | llvm::Constant *CGObjCGNU::GetPropertyGetFunction() { |
2649 | 3 | return GetPropertyFn; |
2650 | 3 | } |
2651 | | |
2652 | 0 | llvm::Constant *CGObjCGNU::GetPropertySetFunction() { |
2653 | 0 | return SetPropertyFn; |
2654 | 0 | } |
2655 | | |
2656 | | llvm::Constant *CGObjCGNU::GetOptimizedPropertySetFunction(bool atomic, |
2657 | 0 | bool copy) { |
2658 | 0 | return nullptr; |
2659 | 0 | } |
2660 | | |
2661 | 0 | llvm::Constant *CGObjCGNU::GetGetStructFunction() { |
2662 | 0 | return GetStructPropertyFn; |
2663 | 0 | } |
2664 | | |
2665 | 0 | llvm::Constant *CGObjCGNU::GetSetStructFunction() { |
2666 | 0 | return SetStructPropertyFn; |
2667 | 0 | } |
2668 | | |
2669 | 0 | llvm::Constant *CGObjCGNU::GetCppAtomicObjectGetFunction() { |
2670 | 0 | return nullptr; |
2671 | 0 | } |
2672 | | |
2673 | 0 | llvm::Constant *CGObjCGNU::GetCppAtomicObjectSetFunction() { |
2674 | 0 | return nullptr; |
2675 | 0 | } |
2676 | | |
2677 | 1 | llvm::Constant *CGObjCGNU::EnumerationMutationFunction() { |
2678 | 1 | return EnumerationMutationFn; |
2679 | 1 | } |
2680 | | |
2681 | | void CGObjCGNU::EmitSynchronizedStmt(CodeGenFunction &CGF, |
2682 | 1 | const ObjCAtSynchronizedStmt &S) { |
2683 | 1 | EmitAtSynchronizedStmt(CGF, S, SyncEnterFn, SyncExitFn); |
2684 | 1 | } |
2685 | | |
2686 | | |
2687 | | void CGObjCGNU::EmitTryStmt(CodeGenFunction &CGF, |
2688 | 4 | const ObjCAtTryStmt &S) { |
2689 | 4 | // Unlike the Apple non-fragile runtimes, which also uses |
2690 | 4 | // unwind-based zero cost exceptions, the GNU Objective C runtime's |
2691 | 4 | // EH support isn't a veneer over C++ EH. Instead, exception |
2692 | 4 | // objects are created by objc_exception_throw and destroyed by |
2693 | 4 | // the personality function; this avoids the need for bracketing |
2694 | 4 | // catch handlers with calls to __blah_begin_catch/__blah_end_catch |
2695 | 4 | // (or even _Unwind_DeleteException), but probably doesn't |
2696 | 4 | // interoperate very well with foreign exceptions. |
2697 | 4 | // |
2698 | 4 | // In Objective-C++ mode, we actually emit something equivalent to the C++ |
2699 | 4 | // exception handler. |
2700 | 4 | EmitTryCatchStmt(CGF, S, EnterCatchFn, ExitCatchFn, ExceptionReThrowFn); |
2701 | 4 | } |
2702 | | |
2703 | | void CGObjCGNU::EmitThrowStmt(CodeGenFunction &CGF, |
2704 | | const ObjCAtThrowStmt &S, |
2705 | 3 | bool ClearInsertionPoint) { |
2706 | 3 | llvm::Value *ExceptionAsObject; |
2707 | 3 | |
2708 | 3 | if (const Expr *ThrowExpr3 = S.getThrowExpr()) { |
2709 | 2 | llvm::Value *Exception = CGF.EmitObjCThrowOperand(ThrowExpr); |
2710 | 2 | ExceptionAsObject = Exception; |
2711 | 3 | } else { |
2712 | 1 | assert((!CGF.ObjCEHValueStack.empty() && CGF.ObjCEHValueStack.back()) && |
2713 | 1 | "Unexpected rethrow outside @catch block."); |
2714 | 1 | ExceptionAsObject = CGF.ObjCEHValueStack.back(); |
2715 | 1 | } |
2716 | 3 | ExceptionAsObject = CGF.Builder.CreateBitCast(ExceptionAsObject, IdTy); |
2717 | 3 | llvm::CallSite Throw = |
2718 | 3 | CGF.EmitRuntimeCallOrInvoke(ExceptionThrowFn, ExceptionAsObject); |
2719 | 3 | Throw.setDoesNotReturn(); |
2720 | 3 | CGF.Builder.CreateUnreachable(); |
2721 | 3 | if (ClearInsertionPoint) |
2722 | 3 | CGF.Builder.ClearInsertionPoint(); |
2723 | 3 | } |
2724 | | |
2725 | | llvm::Value * CGObjCGNU::EmitObjCWeakRead(CodeGenFunction &CGF, |
2726 | 0 | Address AddrWeakObj) { |
2727 | 0 | CGBuilderTy &B = CGF.Builder; |
2728 | 0 | AddrWeakObj = EnforceType(B, AddrWeakObj, PtrToIdTy); |
2729 | 0 | return B.CreateCall(WeakReadFn.getType(), WeakReadFn, |
2730 | 0 | AddrWeakObj.getPointer()); |
2731 | 0 | } |
2732 | | |
2733 | | void CGObjCGNU::EmitObjCWeakAssign(CodeGenFunction &CGF, |
2734 | 0 | llvm::Value *src, Address dst) { |
2735 | 0 | CGBuilderTy &B = CGF.Builder; |
2736 | 0 | src = EnforceType(B, src, IdTy); |
2737 | 0 | dst = EnforceType(B, dst, PtrToIdTy); |
2738 | 0 | B.CreateCall(WeakAssignFn.getType(), WeakAssignFn, |
2739 | 0 | {src, dst.getPointer()}); |
2740 | 0 | } |
2741 | | |
2742 | | void CGObjCGNU::EmitObjCGlobalAssign(CodeGenFunction &CGF, |
2743 | | llvm::Value *src, Address dst, |
2744 | 0 | bool threadlocal) { |
2745 | 0 | CGBuilderTy &B = CGF.Builder; |
2746 | 0 | src = EnforceType(B, src, IdTy); |
2747 | 0 | dst = EnforceType(B, dst, PtrToIdTy); |
2748 | 0 | // FIXME. Add threadloca assign API |
2749 | 0 | assert(!threadlocal && "EmitObjCGlobalAssign - Threal Local API NYI"); |
2750 | 0 | B.CreateCall(GlobalAssignFn.getType(), GlobalAssignFn, |
2751 | 0 | {src, dst.getPointer()}); |
2752 | 0 | } |
2753 | | |
2754 | | void CGObjCGNU::EmitObjCIvarAssign(CodeGenFunction &CGF, |
2755 | | llvm::Value *src, Address dst, |
2756 | 0 | llvm::Value *ivarOffset) { |
2757 | 0 | CGBuilderTy &B = CGF.Builder; |
2758 | 0 | src = EnforceType(B, src, IdTy); |
2759 | 0 | dst = EnforceType(B, dst, IdTy); |
2760 | 0 | B.CreateCall(IvarAssignFn.getType(), IvarAssignFn, |
2761 | 0 | {src, dst.getPointer(), ivarOffset}); |
2762 | 0 | } |
2763 | | |
2764 | | void CGObjCGNU::EmitObjCStrongCastAssign(CodeGenFunction &CGF, |
2765 | 0 | llvm::Value *src, Address dst) { |
2766 | 0 | CGBuilderTy &B = CGF.Builder; |
2767 | 0 | src = EnforceType(B, src, IdTy); |
2768 | 0 | dst = EnforceType(B, dst, PtrToIdTy); |
2769 | 0 | B.CreateCall(StrongCastAssignFn.getType(), StrongCastAssignFn, |
2770 | 0 | {src, dst.getPointer()}); |
2771 | 0 | } |
2772 | | |
2773 | | void CGObjCGNU::EmitGCMemmoveCollectable(CodeGenFunction &CGF, |
2774 | | Address DestPtr, |
2775 | | Address SrcPtr, |
2776 | 0 | llvm::Value *Size) { |
2777 | 0 | CGBuilderTy &B = CGF.Builder; |
2778 | 0 | DestPtr = EnforceType(B, DestPtr, PtrTy); |
2779 | 0 | SrcPtr = EnforceType(B, SrcPtr, PtrTy); |
2780 | 0 |
|
2781 | 0 | B.CreateCall(MemMoveFn.getType(), MemMoveFn, |
2782 | 0 | {DestPtr.getPointer(), SrcPtr.getPointer(), Size}); |
2783 | 0 | } |
2784 | | |
2785 | | llvm::GlobalVariable *CGObjCGNU::ObjCIvarOffsetVariable( |
2786 | | const ObjCInterfaceDecl *ID, |
2787 | 21 | const ObjCIvarDecl *Ivar) { |
2788 | 21 | const std::string Name = "__objc_ivar_offset_" + ID->getNameAsString() |
2789 | 21 | + '.' + Ivar->getNameAsString(); |
2790 | 21 | // Emit the variable and initialize it with what we think the correct value |
2791 | 21 | // is. This allows code compiled with non-fragile ivars to work correctly |
2792 | 21 | // when linked against code which isn't (most of the time). |
2793 | 21 | llvm::GlobalVariable *IvarOffsetPointer = TheModule.getNamedGlobal(Name); |
2794 | 21 | if (!IvarOffsetPointer21 ) { |
2795 | 9 | // This will cause a run-time crash if we accidentally use it. A value of |
2796 | 9 | // 0 would seem more sensible, but will silently overwrite the isa pointer |
2797 | 9 | // causing a great deal of confusion. |
2798 | 9 | uint64_t Offset = -1; |
2799 | 9 | // We can't call ComputeIvarBaseOffset() here if we have the |
2800 | 9 | // implementation, because it will create an invalid ASTRecordLayout object |
2801 | 9 | // that we are then stuck with forever, so we only initialize the ivar |
2802 | 9 | // offset variable with a guess if we only have the interface. The |
2803 | 9 | // initializer will be reset later anyway, when we are generating the class |
2804 | 9 | // description. |
2805 | 9 | if (!CGM.getContext().getObjCImplementation( |
2806 | 9 | const_cast<ObjCInterfaceDecl *>(ID))) |
2807 | 1 | Offset = ComputeIvarBaseOffset(CGM, ID, Ivar); |
2808 | 9 | |
2809 | 9 | llvm::ConstantInt *OffsetGuess = llvm::ConstantInt::get(Int32Ty, Offset, |
2810 | 9 | /*isSigned*/true); |
2811 | 9 | // Don't emit the guess in non-PIC code because the linker will not be able |
2812 | 9 | // to replace it with the real version for a library. In non-PIC code you |
2813 | 9 | // must compile with the fragile ABI if you want to use ivars from a |
2814 | 9 | // GCC-compiled class. |
2815 | 9 | if (CGM.getLangOpts().PICLevel9 ) { |
2816 | 2 | llvm::GlobalVariable *IvarOffsetGV = new llvm::GlobalVariable(TheModule, |
2817 | 2 | Int32Ty, false, |
2818 | 2 | llvm::GlobalValue::PrivateLinkage, OffsetGuess, Name+".guess"); |
2819 | 2 | IvarOffsetPointer = new llvm::GlobalVariable(TheModule, |
2820 | 2 | IvarOffsetGV->getType(), false, llvm::GlobalValue::LinkOnceAnyLinkage, |
2821 | 2 | IvarOffsetGV, Name); |
2822 | 9 | } else { |
2823 | 7 | IvarOffsetPointer = new llvm::GlobalVariable(TheModule, |
2824 | 7 | llvm::Type::getInt32PtrTy(VMContext), false, |
2825 | 7 | llvm::GlobalValue::ExternalLinkage, nullptr, Name); |
2826 | 7 | } |
2827 | 9 | } |
2828 | 21 | return IvarOffsetPointer; |
2829 | 21 | } |
2830 | | |
2831 | | LValue CGObjCGNU::EmitObjCValueForIvar(CodeGenFunction &CGF, |
2832 | | QualType ObjectTy, |
2833 | | llvm::Value *BaseValue, |
2834 | | const ObjCIvarDecl *Ivar, |
2835 | 20 | unsigned CVRQualifiers) { |
2836 | 20 | const ObjCInterfaceDecl *ID = |
2837 | 20 | ObjectTy->getAs<ObjCObjectType>()->getInterface(); |
2838 | 20 | return EmitValueForIvarAtOffset(CGF, ID, BaseValue, Ivar, CVRQualifiers, |
2839 | 20 | EmitIvarOffset(CGF, ID, Ivar)); |
2840 | 20 | } |
2841 | | |
2842 | | static const ObjCInterfaceDecl *FindIvarInterface(ASTContext &Context, |
2843 | | const ObjCInterfaceDecl *OID, |
2844 | 21 | const ObjCIvarDecl *OIVD) { |
2845 | 37 | for (const ObjCIvarDecl *next = OID->all_declared_ivar_begin(); next; |
2846 | 21 | next = next->getNextIvar()16 ) { |
2847 | 37 | if (OIVD == next) |
2848 | 21 | return OID; |
2849 | 37 | } |
2850 | 21 | |
2851 | 21 | // Otherwise check in the super class. |
2852 | 0 | if (const ObjCInterfaceDecl *0 Super0 = OID->getSuperClass()) |
2853 | 0 | return FindIvarInterface(Context, Super, OIVD); |
2854 | 0 |
|
2855 | 0 | return nullptr; |
2856 | 0 | } |
2857 | | |
2858 | | llvm::Value *CGObjCGNU::EmitIvarOffset(CodeGenFunction &CGF, |
2859 | | const ObjCInterfaceDecl *Interface, |
2860 | 27 | const ObjCIvarDecl *Ivar) { |
2861 | 27 | if (CGM.getLangOpts().ObjCRuntime.isNonFragile()27 ) { |
2862 | 21 | Interface = FindIvarInterface(CGM.getContext(), Interface, Ivar); |
2863 | 21 | |
2864 | 21 | // The MSVC linker cannot have a single global defined as LinkOnceAnyLinkage |
2865 | 21 | // and ExternalLinkage, so create a reference to the ivar global and rely on |
2866 | 21 | // the definition being created as part of GenerateClass. |
2867 | 21 | if (RuntimeVersion < 10 || |
2868 | 0 | CGF.CGM.getTarget().getTriple().isKnownWindowsMSVCEnvironment()) |
2869 | 21 | return CGF.Builder.CreateZExtOrBitCast( |
2870 | 21 | CGF.Builder.CreateAlignedLoad( |
2871 | 21 | Int32Ty, CGF.Builder.CreateAlignedLoad( |
2872 | 21 | ObjCIvarOffsetVariable(Interface, Ivar), |
2873 | 21 | CGF.getPointerAlign(), "ivar"), |
2874 | 21 | CharUnits::fromQuantity(4)), |
2875 | 21 | PtrDiffTy); |
2876 | 0 | std::string name = "__objc_ivar_offset_value_" + |
2877 | 0 | Interface->getNameAsString() +"." + Ivar->getNameAsString(); |
2878 | 0 | CharUnits Align = CGM.getIntAlign(); |
2879 | 0 | llvm::Value *Offset = TheModule.getGlobalVariable(name); |
2880 | 0 | if (!Offset0 ) { |
2881 | 0 | auto GV = new llvm::GlobalVariable(TheModule, IntTy, |
2882 | 0 | false, llvm::GlobalValue::LinkOnceAnyLinkage, |
2883 | 0 | llvm::Constant::getNullValue(IntTy), name); |
2884 | 0 | GV->setAlignment(Align.getQuantity()); |
2885 | 0 | Offset = GV; |
2886 | 0 | } |
2887 | 0 | Offset = CGF.Builder.CreateAlignedLoad(Offset, Align); |
2888 | 0 | if (Offset->getType() != PtrDiffTy) |
2889 | 0 | Offset = CGF.Builder.CreateZExtOrBitCast(Offset, PtrDiffTy); |
2890 | 21 | return Offset; |
2891 | 21 | } |
2892 | 6 | uint64_t Offset = ComputeIvarBaseOffset(CGF.CGM, Interface, Ivar); |
2893 | 6 | return llvm::ConstantInt::get(PtrDiffTy, Offset, /*isSigned*/true); |
2894 | 6 | } |
2895 | | |
2896 | | CGObjCRuntime * |
2897 | 23 | clang::CodeGen::CreateGNUObjCRuntime(CodeGenModule &CGM) { |
2898 | 23 | switch (CGM.getLangOpts().ObjCRuntime.getKind()) { |
2899 | 7 | case ObjCRuntime::GNUstep: |
2900 | 7 | return new CGObjCGNUstep(CGM); |
2901 | 23 | |
2902 | 11 | case ObjCRuntime::GCC: |
2903 | 11 | return new CGObjCGCC(CGM); |
2904 | 23 | |
2905 | 5 | case ObjCRuntime::ObjFW: |
2906 | 5 | return new CGObjCObjFW(CGM); |
2907 | 23 | |
2908 | 0 | case ObjCRuntime::FragileMacOSX: |
2909 | 0 | case ObjCRuntime::MacOSX: |
2910 | 0 | case ObjCRuntime::iOS: |
2911 | 0 | case ObjCRuntime::WatchOS: |
2912 | 0 | llvm_unreachable("these runtimes are not GNU runtimes"); |
2913 | 0 | } |
2914 | 0 | llvm_unreachable0 ("bad runtime"); |
2915 | 0 | } |