Daniel Dunbar | c17a4d3 | 2008-08-11 02:45:11 +0000 | [diff] [blame] | 1 | //===------- CGObjCMac.cpp - Interface to Apple Objective-C Runtime -------===// |
| 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 targetting the Apple runtime. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "CGObjCRuntime.h" |
Daniel Dunbar | f77ac86 | 2008-08-11 21:35:06 +0000 | [diff] [blame] | 15 | |
| 16 | #include "CodeGenModule.h" |
Daniel Dunbar | bbce49b | 2008-08-12 00:12:39 +0000 | [diff] [blame] | 17 | #include "clang/AST/ASTContext.h" |
Daniel Dunbar | e91593e | 2008-08-11 04:54:23 +0000 | [diff] [blame] | 18 | #include "clang/AST/Decl.h" |
Daniel Dunbar | f77ac86 | 2008-08-11 21:35:06 +0000 | [diff] [blame] | 19 | #include "clang/Basic/LangOptions.h" |
| 20 | |
Daniel Dunbar | bbce49b | 2008-08-12 00:12:39 +0000 | [diff] [blame] | 21 | #include "llvm/Module.h" |
Daniel Dunbar | c17a4d3 | 2008-08-11 02:45:11 +0000 | [diff] [blame] | 22 | #include "llvm/Support/IRBuilder.h" |
Daniel Dunbar | 4e2d7d0 | 2008-08-12 06:48:42 +0000 | [diff] [blame] | 23 | #include "llvm/Target/TargetData.h" |
Daniel Dunbar | c17a4d3 | 2008-08-11 02:45:11 +0000 | [diff] [blame] | 24 | |
| 25 | using namespace clang; |
| 26 | |
| 27 | namespace { |
Daniel Dunbar | bbce49b | 2008-08-12 00:12:39 +0000 | [diff] [blame] | 28 | |
| 29 | /// ObjCTypesHelper - Helper class that encapsulates lazy |
| 30 | /// construction of varies types used during ObjC generation. |
| 31 | class ObjCTypesHelper { |
| 32 | private: |
| 33 | CodeGen::CodeGenModule &CGM; |
| 34 | |
| 35 | const llvm::StructType *CFStringType; |
| 36 | llvm::Constant *CFConstantStringClassReference; |
Daniel Dunbar | 259d93d | 2008-08-12 03:39:23 +0000 | [diff] [blame] | 37 | llvm::Function *MessageSendFn; |
| 38 | |
Daniel Dunbar | bbce49b | 2008-08-12 00:12:39 +0000 | [diff] [blame] | 39 | public: |
| 40 | const llvm::Type *LongTy; |
Daniel Dunbar | 259d93d | 2008-08-12 03:39:23 +0000 | [diff] [blame] | 41 | |
Daniel Dunbar | 2bedbf8 | 2008-08-12 05:28:47 +0000 | [diff] [blame] | 42 | /// ObjectPtrTy - LLVM type for object handles (typeof(id)) |
| 43 | const llvm::Type *ObjectPtrTy; |
Daniel Dunbar | 4e2d7d0 | 2008-08-12 06:48:42 +0000 | [diff] [blame] | 44 | /// SelectorPtrTy - LLVM type for selector handles (typeof(SEL)) |
Daniel Dunbar | 2bedbf8 | 2008-08-12 05:28:47 +0000 | [diff] [blame] | 45 | const llvm::Type *SelectorPtrTy; |
Daniel Dunbar | 4e2d7d0 | 2008-08-12 06:48:42 +0000 | [diff] [blame] | 46 | /// ProtocolPtrTy - LLVM type for protocol handles (typeof(Protocol)) |
| 47 | const llvm::Type *ProtocolPtrTy; |
| 48 | |
| 49 | /// SymtabTy - LLVM type for struct objc_symtab. |
| 50 | const llvm::StructType *SymtabTy; |
| 51 | /// ModuleTy - LLVM type for struct objc_module. |
| 52 | const llvm::StructType *ModuleTy; |
Daniel Dunbar | 259d93d | 2008-08-12 03:39:23 +0000 | [diff] [blame] | 53 | |
Daniel Dunbar | bbce49b | 2008-08-12 00:12:39 +0000 | [diff] [blame] | 54 | public: |
| 55 | ObjCTypesHelper(CodeGen::CodeGenModule &cgm); |
| 56 | ~ObjCTypesHelper(); |
| 57 | |
| 58 | llvm::Constant *getCFConstantStringClassReference(); |
| 59 | const llvm::StructType *getCFStringType(); |
Daniel Dunbar | 259d93d | 2008-08-12 03:39:23 +0000 | [diff] [blame] | 60 | llvm::Function *getMessageSendFn(); |
Daniel Dunbar | bbce49b | 2008-08-12 00:12:39 +0000 | [diff] [blame] | 61 | }; |
| 62 | |
Daniel Dunbar | c17a4d3 | 2008-08-11 02:45:11 +0000 | [diff] [blame] | 63 | class CGObjCMac : public CodeGen::CGObjCRuntime { |
| 64 | private: |
Daniel Dunbar | bbce49b | 2008-08-12 00:12:39 +0000 | [diff] [blame] | 65 | CodeGen::CodeGenModule &CGM; |
| 66 | ObjCTypesHelper ObjCTypes; |
| 67 | /// ObjCABI - FIXME: Not sure yet. |
| 68 | unsigned ObjCABI; |
Daniel Dunbar | c17a4d3 | 2008-08-11 02:45:11 +0000 | [diff] [blame] | 69 | |
Daniel Dunbar | 4e2d7d0 | 2008-08-12 06:48:42 +0000 | [diff] [blame] | 70 | /// ClassNames - uniqued class names. |
| 71 | llvm::DenseMap<Selector, llvm::GlobalVariable*> ClassNames; |
| 72 | |
Daniel Dunbar | 259d93d | 2008-08-12 03:39:23 +0000 | [diff] [blame] | 73 | /// MethodVarNames - uniqued method variable names. |
| 74 | llvm::DenseMap<Selector, llvm::GlobalVariable*> MethodVarNames; |
| 75 | |
| 76 | /// SelectorReferences - uniqued selector references. |
| 77 | llvm::DenseMap<Selector, llvm::GlobalVariable*> SelectorReferences; |
| 78 | |
Daniel Dunbar | f77ac86 | 2008-08-11 21:35:06 +0000 | [diff] [blame] | 79 | /// UsedGlobals - list of globals to pack into the llvm.used metadata |
| 80 | /// to prevent them from being clobbered. |
Daniel Dunbar | 4e2d7d0 | 2008-08-12 06:48:42 +0000 | [diff] [blame] | 81 | std::vector<llvm::GlobalVariable*> UsedGlobals; |
Daniel Dunbar | f77ac86 | 2008-08-11 21:35:06 +0000 | [diff] [blame] | 82 | |
| 83 | /// EmitImageInfo - Emit the image info marker used to encode some module |
| 84 | /// level information. |
| 85 | void EmitImageInfo(); |
| 86 | |
Daniel Dunbar | 4e2d7d0 | 2008-08-12 06:48:42 +0000 | [diff] [blame] | 87 | /// EmitModuleInfo - Another marker encoding module level |
| 88 | /// information. |
| 89 | |
| 90 | // FIXME: Not sure yet of the difference between this and |
| 91 | // IMAGE_INFO. otool looks at this before printing out Obj-C info |
| 92 | // though... |
| 93 | void EmitModuleInfo(); |
| 94 | |
| 95 | /// EmitModuleSymols - Emit module symbols, the result is a constant |
| 96 | /// of type pointer-to SymtabTy. // FIXME: Describe more completely |
| 97 | /// once known. |
| 98 | llvm::Constant *EmitModuleSymbols(); |
| 99 | |
Daniel Dunbar | f77ac86 | 2008-08-11 21:35:06 +0000 | [diff] [blame] | 100 | /// FinishModule - Write out global data structures at the end of |
| 101 | /// processing a translation unit. |
| 102 | void FinishModule(); |
Daniel Dunbar | 259d93d | 2008-08-12 03:39:23 +0000 | [diff] [blame] | 103 | |
| 104 | /// EmitSelector - Return a Value*, of type ObjCTypes.SelectorPtrTy, |
| 105 | /// for the given selector. |
| 106 | llvm::Value *EmitSelector(llvm::IRBuilder<> &Builder, Selector Sel); |
| 107 | |
Daniel Dunbar | 4e2d7d0 | 2008-08-12 06:48:42 +0000 | [diff] [blame] | 108 | /// GetClassName - Return a unique constant for the given selector's |
| 109 | /// name. |
| 110 | llvm::Constant *GetClassName(Selector Sel); |
| 111 | |
Daniel Dunbar | 259d93d | 2008-08-12 03:39:23 +0000 | [diff] [blame] | 112 | /// GetMethodVarName - Return a unique constant for the given |
| 113 | /// selector's name. |
| 114 | llvm::Constant *GetMethodVarName(Selector Sel); |
Daniel Dunbar | f77ac86 | 2008-08-11 21:35:06 +0000 | [diff] [blame] | 115 | |
Daniel Dunbar | c17a4d3 | 2008-08-11 02:45:11 +0000 | [diff] [blame] | 116 | public: |
| 117 | CGObjCMac(CodeGen::CodeGenModule &cgm); |
Daniel Dunbar | bbce49b | 2008-08-12 00:12:39 +0000 | [diff] [blame] | 118 | virtual llvm::Constant *GenerateConstantString(const std::string &String); |
Daniel Dunbar | c17a4d3 | 2008-08-11 02:45:11 +0000 | [diff] [blame] | 119 | |
| 120 | virtual llvm::Value *GenerateMessageSend(llvm::IRBuilder<> &Builder, |
| 121 | const llvm::Type *ReturnTy, |
Daniel Dunbar | c17a4d3 | 2008-08-11 02:45:11 +0000 | [diff] [blame] | 122 | llvm::Value *Receiver, |
| 123 | Selector Sel, |
| 124 | llvm::Value** ArgV, |
| 125 | unsigned ArgC); |
| 126 | |
| 127 | virtual llvm::Value *GenerateMessageSendSuper(llvm::IRBuilder<> &Builder, |
| 128 | const llvm::Type *ReturnTy, |
Daniel Dunbar | c17a4d3 | 2008-08-11 02:45:11 +0000 | [diff] [blame] | 129 | const char *SuperClassName, |
| 130 | llvm::Value *Receiver, |
| 131 | Selector Sel, |
| 132 | llvm::Value** ArgV, |
| 133 | unsigned ArgC); |
| 134 | |
| 135 | virtual llvm::Value *LookupClass(llvm::IRBuilder<> &Builder, |
| 136 | llvm::Value *ClassName); |
| 137 | |
| 138 | virtual llvm::Value *GetSelector(llvm::IRBuilder<> &Builder, Selector Sel); |
| 139 | |
| 140 | virtual llvm::Function *MethodPreamble(const std::string &ClassName, |
| 141 | const std::string &CategoryName, |
| 142 | const std::string &MethodName, |
| 143 | const llvm::Type *ReturnTy, |
| 144 | const llvm::Type *SelfTy, |
| 145 | const llvm::Type **ArgTy, |
| 146 | unsigned ArgC, |
| 147 | bool isClassMethod, |
| 148 | bool isVarArg); |
| 149 | |
| 150 | virtual void GenerateCategory(const char *ClassName, const char *CategoryName, |
| 151 | const llvm::SmallVectorImpl<Selector> &InstanceMethodSels, |
| 152 | const llvm::SmallVectorImpl<llvm::Constant *> &InstanceMethodTypes, |
| 153 | const llvm::SmallVectorImpl<Selector> &ClassMethodSels, |
| 154 | const llvm::SmallVectorImpl<llvm::Constant *> &ClassMethodTypes, |
| 155 | const llvm::SmallVectorImpl<std::string> &Protocols); |
| 156 | |
| 157 | virtual void GenerateClass( |
| 158 | const char *ClassName, |
| 159 | const char *SuperClassName, |
| 160 | const int instanceSize, |
| 161 | const llvm::SmallVectorImpl<llvm::Constant *> &IvarNames, |
| 162 | const llvm::SmallVectorImpl<llvm::Constant *> &IvarTypes, |
| 163 | const llvm::SmallVectorImpl<llvm::Constant *> &IvarOffsets, |
| 164 | const llvm::SmallVectorImpl<Selector> &InstanceMethodSels, |
| 165 | const llvm::SmallVectorImpl<llvm::Constant *> &InstanceMethodTypes, |
| 166 | const llvm::SmallVectorImpl<Selector> &ClassMethodSels, |
| 167 | const llvm::SmallVectorImpl<llvm::Constant *> &ClassMethodTypes, |
| 168 | const llvm::SmallVectorImpl<std::string> &Protocols); |
| 169 | |
| 170 | virtual llvm::Value *GenerateProtocolRef(llvm::IRBuilder<> &Builder, |
Daniel Dunbar | af2f62c | 2008-08-13 00:59:25 +0000 | [diff] [blame^] | 171 | const ObjCProtocolDecl *PD); |
Daniel Dunbar | c17a4d3 | 2008-08-11 02:45:11 +0000 | [diff] [blame] | 172 | |
Daniel Dunbar | af2f62c | 2008-08-13 00:59:25 +0000 | [diff] [blame^] | 173 | virtual void GenerateProtocol(const ObjCProtocolDecl *PD); |
Daniel Dunbar | c17a4d3 | 2008-08-11 02:45:11 +0000 | [diff] [blame] | 174 | |
| 175 | virtual llvm::Function *ModuleInitFunction(); |
| 176 | }; |
| 177 | } // end anonymous namespace |
Daniel Dunbar | bbce49b | 2008-08-12 00:12:39 +0000 | [diff] [blame] | 178 | |
| 179 | /* *** Helper Functions *** */ |
| 180 | |
| 181 | /// getConstantGEP() - Help routine to construct simple GEPs. |
| 182 | static llvm::Constant *getConstantGEP(llvm::Constant *C, |
| 183 | unsigned idx0, |
| 184 | unsigned idx1) { |
| 185 | llvm::Value *Idxs[] = { |
| 186 | llvm::ConstantInt::get(llvm::Type::Int32Ty, idx0), |
| 187 | llvm::ConstantInt::get(llvm::Type::Int32Ty, idx1) |
| 188 | }; |
| 189 | return llvm::ConstantExpr::getGetElementPtr(C, Idxs, 2); |
| 190 | } |
| 191 | |
| 192 | /* *** CGObjCMac Public Interface *** */ |
Daniel Dunbar | c17a4d3 | 2008-08-11 02:45:11 +0000 | [diff] [blame] | 193 | |
Daniel Dunbar | bbce49b | 2008-08-12 00:12:39 +0000 | [diff] [blame] | 194 | CGObjCMac::CGObjCMac(CodeGen::CodeGenModule &cgm) |
| 195 | : CGM(cgm), |
| 196 | ObjCTypes(cgm), |
| 197 | ObjCABI(1) |
| 198 | { |
| 199 | // FIXME: How does this get set in GCC? And what does it even mean? |
| 200 | if (ObjCTypes.LongTy != CGM.getTypes().ConvertType(CGM.getContext().IntTy)) |
| 201 | ObjCABI = 2; |
| 202 | |
| 203 | EmitImageInfo(); |
Daniel Dunbar | c17a4d3 | 2008-08-11 02:45:11 +0000 | [diff] [blame] | 204 | } |
| 205 | |
| 206 | // This has to perform the lookup every time, since posing and related |
| 207 | // techniques can modify the name -> class mapping. |
| 208 | llvm::Value *CGObjCMac::LookupClass(llvm::IRBuilder<> &Builder, |
| 209 | llvm::Value *ClassName) { |
| 210 | assert(0 && "Cannot lookup classes on Mac runtime."); |
| 211 | return 0; |
| 212 | } |
| 213 | |
| 214 | /// GetSelector - Return the pointer to the unique'd string for this selector. |
| 215 | llvm::Value *CGObjCMac::GetSelector(llvm::IRBuilder<> &Builder, Selector Sel) { |
Daniel Dunbar | 259d93d | 2008-08-12 03:39:23 +0000 | [diff] [blame] | 216 | return EmitSelector(Builder, Sel); |
Daniel Dunbar | c17a4d3 | 2008-08-11 02:45:11 +0000 | [diff] [blame] | 217 | } |
| 218 | |
Daniel Dunbar | bbce49b | 2008-08-12 00:12:39 +0000 | [diff] [blame] | 219 | /// Generate a constant CFString object. |
| 220 | /* |
| 221 | struct __builtin_CFString { |
| 222 | const int *isa; // point to __CFConstantStringClassReference |
| 223 | int flags; |
| 224 | const char *str; |
| 225 | long length; |
| 226 | }; |
| 227 | */ |
| 228 | |
| 229 | llvm::Constant *CGObjCMac::GenerateConstantString(const std::string &String) { |
| 230 | // FIXME: I have no idea what this constant is (it is a magic |
| 231 | // constant in GCC as well). Most likely the encoding of the string |
| 232 | // and at least one part of it relates to UTF-16. Is this just the |
| 233 | // code for UTF-8? Where is this handled for us? |
| 234 | // See: <rdr://2996215> |
| 235 | unsigned flags = 0x07c8; |
| 236 | |
| 237 | // FIXME: Use some machinery to unique this. We can't reuse the CGM |
| 238 | // one since we put them in a different section. |
| 239 | llvm::Constant *StringC = llvm::ConstantArray::get(String); |
| 240 | llvm::Constant *StringGV = |
| 241 | new llvm::GlobalVariable(StringC->getType(), true, |
| 242 | llvm::GlobalValue::InternalLinkage, |
| 243 | StringC, ".str", &CGM.getModule()); |
| 244 | llvm::Constant *Values[4] = { |
| 245 | ObjCTypes.getCFConstantStringClassReference(), |
| 246 | llvm::ConstantInt::get(llvm::Type::Int32Ty, flags), |
| 247 | getConstantGEP(StringGV, 0, 0), // Decay array -> ptr |
| 248 | llvm::ConstantInt::get(ObjCTypes.LongTy, String.size()) |
| 249 | }; |
| 250 | |
| 251 | llvm::Constant *CFStringC = |
| 252 | llvm::ConstantStruct::get(ObjCTypes.getCFStringType(), |
| 253 | std::vector<llvm::Constant*>(Values, Values+4)); |
| 254 | |
| 255 | llvm::GlobalVariable *CFStringGV = |
| 256 | new llvm::GlobalVariable(CFStringC->getType(), true, |
| 257 | llvm::GlobalValue::InternalLinkage, |
| 258 | CFStringC, "", |
| 259 | &CGM.getModule()); |
| 260 | |
| 261 | CFStringGV->setSection("__DATA, __cfstring"); |
| 262 | |
| 263 | return CFStringGV; |
Daniel Dunbar | c17a4d3 | 2008-08-11 02:45:11 +0000 | [diff] [blame] | 264 | } |
| 265 | |
| 266 | /// Generates a message send where the super is the receiver. This is |
| 267 | /// a message send to self with special delivery semantics indicating |
| 268 | /// which class's method should be called. |
| 269 | llvm::Value *CGObjCMac::GenerateMessageSendSuper(llvm::IRBuilder<> &Builder, |
| 270 | const llvm::Type *ReturnTy, |
Daniel Dunbar | c17a4d3 | 2008-08-11 02:45:11 +0000 | [diff] [blame] | 271 | const char *SuperClassName, |
| 272 | llvm::Value *Receiver, |
| 273 | Selector Sel, |
| 274 | llvm::Value** ArgV, |
| 275 | unsigned ArgC) { |
| 276 | assert(0 && "Cannot generate message send to super for Mac runtime."); |
| 277 | return 0; |
| 278 | } |
| 279 | |
| 280 | /// Generate code for a message send expression. |
| 281 | llvm::Value *CGObjCMac::GenerateMessageSend(llvm::IRBuilder<> &Builder, |
| 282 | const llvm::Type *ReturnTy, |
Daniel Dunbar | c17a4d3 | 2008-08-11 02:45:11 +0000 | [diff] [blame] | 283 | llvm::Value *Receiver, |
| 284 | Selector Sel, |
| 285 | llvm::Value** ArgV, |
Daniel Dunbar | 2bedbf8 | 2008-08-12 05:28:47 +0000 | [diff] [blame] | 286 | unsigned ArgC) { |
| 287 | llvm::Function *F = ObjCTypes.getMessageSendFn(); |
| 288 | llvm::Value **Args = new llvm::Value*[ArgC+2]; |
| 289 | Args[0] = Builder.CreateBitCast(Receiver, ObjCTypes.ObjectPtrTy, "tmp"); |
| 290 | Args[1] = EmitSelector(Builder, Sel); |
| 291 | std::copy(ArgV, ArgV+ArgC, Args+2); |
| 292 | llvm::CallInst *CI = Builder.CreateCall(F, Args, Args+ArgC+2, "tmp"); |
| 293 | delete[] Args; |
| 294 | return Builder.CreateBitCast(CI, ReturnTy, "tmp"); |
Daniel Dunbar | c17a4d3 | 2008-08-11 02:45:11 +0000 | [diff] [blame] | 295 | } |
| 296 | |
| 297 | llvm::Value *CGObjCMac::GenerateProtocolRef(llvm::IRBuilder<> &Builder, |
Daniel Dunbar | af2f62c | 2008-08-13 00:59:25 +0000 | [diff] [blame^] | 298 | const ObjCProtocolDecl *PD) { |
Daniel Dunbar | 4e2d7d0 | 2008-08-12 06:48:42 +0000 | [diff] [blame] | 299 | // assert(0 && "Cannot get protocol reference on Mac runtime."); |
| 300 | return llvm::Constant::getNullValue(ObjCTypes.ProtocolPtrTy); |
Daniel Dunbar | c17a4d3 | 2008-08-11 02:45:11 +0000 | [diff] [blame] | 301 | return 0; |
| 302 | } |
| 303 | |
Daniel Dunbar | af2f62c | 2008-08-13 00:59:25 +0000 | [diff] [blame^] | 304 | void CGObjCMac::GenerateProtocol(const ObjCProtocolDecl *PD) { |
Daniel Dunbar | 4e2d7d0 | 2008-08-12 06:48:42 +0000 | [diff] [blame] | 305 | // assert(0 && "Cannot generate protocol for Mac runtime."); |
Daniel Dunbar | c17a4d3 | 2008-08-11 02:45:11 +0000 | [diff] [blame] | 306 | } |
| 307 | |
| 308 | void CGObjCMac::GenerateCategory( |
| 309 | const char *ClassName, |
| 310 | const char *CategoryName, |
| 311 | const llvm::SmallVectorImpl<Selector> &InstanceMethodSels, |
| 312 | const llvm::SmallVectorImpl<llvm::Constant *> &InstanceMethodTypes, |
| 313 | const llvm::SmallVectorImpl<Selector> &ClassMethodSels, |
| 314 | const llvm::SmallVectorImpl<llvm::Constant *> &ClassMethodTypes, |
| 315 | const llvm::SmallVectorImpl<std::string> &Protocols) { |
| 316 | assert(0 && "Cannot generate category for Mac runtime."); |
| 317 | } |
| 318 | |
| 319 | void CGObjCMac::GenerateClass( |
| 320 | const char *ClassName, |
| 321 | const char *SuperClassName, |
| 322 | const int instanceSize, |
| 323 | const llvm::SmallVectorImpl<llvm::Constant *> &IvarNames, |
| 324 | const llvm::SmallVectorImpl<llvm::Constant *> &IvarTypes, |
| 325 | const llvm::SmallVectorImpl<llvm::Constant *> &IvarOffsets, |
| 326 | const llvm::SmallVectorImpl<Selector> &InstanceMethodSels, |
| 327 | const llvm::SmallVectorImpl<llvm::Constant *> &InstanceMethodTypes, |
| 328 | const llvm::SmallVectorImpl<Selector> &ClassMethodSels, |
| 329 | const llvm::SmallVectorImpl<llvm::Constant *> &ClassMethodTypes, |
| 330 | const llvm::SmallVectorImpl<std::string> &Protocols) { |
| 331 | assert(0 && "Cannot generate class for Mac runtime."); |
| 332 | } |
| 333 | |
| 334 | llvm::Function *CGObjCMac::ModuleInitFunction() { |
Daniel Dunbar | f77ac86 | 2008-08-11 21:35:06 +0000 | [diff] [blame] | 335 | // Abuse this interface function as a place to finalize. |
| 336 | FinishModule(); |
| 337 | |
Daniel Dunbar | c17a4d3 | 2008-08-11 02:45:11 +0000 | [diff] [blame] | 338 | return NULL; |
| 339 | } |
| 340 | |
Daniel Dunbar | 259d93d | 2008-08-12 03:39:23 +0000 | [diff] [blame] | 341 | llvm::Function *CGObjCMac::MethodPreamble(const std::string &ClassName, |
| 342 | const std::string &CategoryName, |
| 343 | const std::string &MethodName, |
| 344 | const llvm::Type *ReturnTy, |
| 345 | const llvm::Type *SelfTy, |
| 346 | const llvm::Type **ArgTy, |
| 347 | unsigned ArgC, |
| 348 | bool isClassMethod, |
| 349 | bool isVarArg) { |
Daniel Dunbar | c17a4d3 | 2008-08-11 02:45:11 +0000 | [diff] [blame] | 350 | assert(0 && "Cannot generate method preamble for Mac runtime."); |
| 351 | return 0; |
| 352 | } |
| 353 | |
Daniel Dunbar | f77ac86 | 2008-08-11 21:35:06 +0000 | [diff] [blame] | 354 | /* *** Private Interface *** */ |
| 355 | |
| 356 | /// EmitImageInfo - Emit the image info marker used to encode some module |
| 357 | /// level information. |
| 358 | /// |
| 359 | /// See: <rdr://4810609&4810587&4810587> |
| 360 | /// struct IMAGE_INFO { |
| 361 | /// unsigned version; |
| 362 | /// unsigned flags; |
| 363 | /// }; |
| 364 | enum ImageInfoFlags { |
| 365 | eImageInfo_FixAndContinue = (1 << 0), // FIXME: Not sure what this implies |
| 366 | eImageInfo_GarbageCollected = (1 << 1), |
| 367 | eImageInfo_GCOnly = (1 << 2) |
| 368 | }; |
| 369 | |
| 370 | void CGObjCMac::EmitImageInfo() { |
| 371 | unsigned version = 0; // Version is unused? |
| 372 | unsigned flags = 0; |
| 373 | |
| 374 | // FIXME: Fix and continue? |
| 375 | if (CGM.getLangOptions().getGCMode() != LangOptions::NonGC) |
| 376 | flags |= eImageInfo_GarbageCollected; |
| 377 | if (CGM.getLangOptions().getGCMode() == LangOptions::GCOnly) |
| 378 | flags |= eImageInfo_GCOnly; |
| 379 | |
Daniel Dunbar | f77ac86 | 2008-08-11 21:35:06 +0000 | [diff] [blame] | 380 | // Emitted as int[2]; |
| 381 | llvm::Constant *values[2] = { |
| 382 | llvm::ConstantInt::get(llvm::Type::Int32Ty, version), |
| 383 | llvm::ConstantInt::get(llvm::Type::Int32Ty, flags) |
| 384 | }; |
| 385 | llvm::ArrayType *AT = llvm::ArrayType::get(llvm::Type::Int32Ty, 2); |
Daniel Dunbar | 4e2d7d0 | 2008-08-12 06:48:42 +0000 | [diff] [blame] | 386 | llvm::GlobalVariable *GV = |
Daniel Dunbar | f77ac86 | 2008-08-11 21:35:06 +0000 | [diff] [blame] | 387 | new llvm::GlobalVariable(AT, true, |
| 388 | llvm::GlobalValue::InternalLinkage, |
| 389 | llvm::ConstantArray::get(AT, values, 2), |
| 390 | "\01L_OBJC_IMAGE_INFO", |
| 391 | &CGM.getModule()); |
| 392 | |
Daniel Dunbar | bbce49b | 2008-08-12 00:12:39 +0000 | [diff] [blame] | 393 | if (ObjCABI == 1) { |
| 394 | GV->setSection("__OBJC, __image_info,regular"); |
| 395 | } else { |
| 396 | GV->setSection("__DATA, __objc_imageinfo, regular, no_dead_strip"); |
| 397 | } |
Daniel Dunbar | f77ac86 | 2008-08-11 21:35:06 +0000 | [diff] [blame] | 398 | |
| 399 | UsedGlobals.push_back(GV); |
| 400 | } |
| 401 | |
Daniel Dunbar | 4e2d7d0 | 2008-08-12 06:48:42 +0000 | [diff] [blame] | 402 | |
| 403 | // struct objc_module { |
| 404 | // unsigned long version; |
| 405 | // unsigned long size; |
| 406 | // const char *name; |
| 407 | // Symtab symtab; |
| 408 | // }; |
| 409 | |
| 410 | // FIXME: Get from somewhere |
| 411 | static const int ModuleVersion = 7; |
| 412 | |
| 413 | void CGObjCMac::EmitModuleInfo() { |
| 414 | IdentifierInfo *EmptyIdent = &CGM.getContext().Idents.get(""); |
| 415 | Selector EmptySel = CGM.getContext().Selectors.getNullarySelector(EmptyIdent); |
| 416 | uint64_t Size = CGM.getTargetData().getABITypeSize(ObjCTypes.ModuleTy); |
| 417 | |
| 418 | std::vector<llvm::Constant*> Values(4); |
| 419 | Values[0] = llvm::ConstantInt::get(ObjCTypes.LongTy, ModuleVersion); |
| 420 | Values[1] = llvm::ConstantInt::get(ObjCTypes.LongTy, Size); |
| 421 | // FIXME: GCC just appears to make up an empty name for this? Why? |
| 422 | Values[2] = getConstantGEP(GetClassName(EmptySel), 0, 0); |
| 423 | Values[3] = EmitModuleSymbols(); |
| 424 | |
| 425 | llvm::GlobalVariable *GV = |
| 426 | new llvm::GlobalVariable(ObjCTypes.ModuleTy, false, |
| 427 | llvm::GlobalValue::InternalLinkage, |
| 428 | llvm::ConstantStruct::get(ObjCTypes.ModuleTy, |
| 429 | Values), |
| 430 | "\01L_OBJC_MODULE_INFO", |
| 431 | &CGM.getModule()); |
| 432 | GV->setSection("__OBJC,__module_info,regular,no_dead_strip"); |
| 433 | UsedGlobals.push_back(GV); |
| 434 | } |
| 435 | |
| 436 | llvm::Constant *CGObjCMac::EmitModuleSymbols() { |
| 437 | // FIXME: Is this ever used? |
| 438 | llvm::GlobalVariable *GV = |
| 439 | new llvm::GlobalVariable(ObjCTypes.SymtabTy, false, |
| 440 | llvm::GlobalValue::InternalLinkage, |
| 441 | llvm::Constant::getNullValue(ObjCTypes.SymtabTy), |
| 442 | "\01L_OBJC_SYMBOLS", |
| 443 | &CGM.getModule()); |
| 444 | GV->setSection("__OBJC,__symbols,regular,no_dead_strip"); |
| 445 | UsedGlobals.push_back(GV); |
| 446 | return GV; |
| 447 | } |
| 448 | |
Daniel Dunbar | 259d93d | 2008-08-12 03:39:23 +0000 | [diff] [blame] | 449 | llvm::Value *CGObjCMac::EmitSelector(llvm::IRBuilder<> &Builder, Selector Sel) { |
| 450 | llvm::GlobalVariable *&Entry = SelectorReferences[Sel]; |
| 451 | |
| 452 | if (!Entry) { |
| 453 | llvm::Constant *Casted = |
| 454 | llvm::ConstantExpr::getBitCast(GetMethodVarName(Sel), |
| 455 | ObjCTypes.SelectorPtrTy); |
| 456 | Entry = |
| 457 | new llvm::GlobalVariable(ObjCTypes.SelectorPtrTy, false, |
| 458 | llvm::GlobalValue::InternalLinkage, |
| 459 | Casted, "\01L_OBJC_SELECTOR_REFERENCES_", |
| 460 | &CGM.getModule()); |
| 461 | Entry->setSection("__OBJC,__message_refs,literal_pointers,no_dead_strip"); |
| 462 | UsedGlobals.push_back(Entry); |
| 463 | } |
| 464 | |
| 465 | return Builder.CreateLoad(Entry, false, "tmp"); |
| 466 | } |
| 467 | |
Daniel Dunbar | 4e2d7d0 | 2008-08-12 06:48:42 +0000 | [diff] [blame] | 468 | llvm::Constant *CGObjCMac::GetClassName(Selector Sel) { |
| 469 | llvm::GlobalVariable *&Entry = ClassNames[Sel]; |
| 470 | |
| 471 | if (!Entry) { |
| 472 | llvm::Constant *C = llvm::ConstantArray::get(Sel.getName()); |
| 473 | Entry = |
| 474 | new llvm::GlobalVariable(C->getType(), true, |
| 475 | llvm::GlobalValue::InternalLinkage, |
| 476 | C, "\01L_OBJC_CLASS_NAME_", |
| 477 | &CGM.getModule()); |
| 478 | Entry->setSection("__TEXT,__cstring,cstring_literals"); |
| 479 | UsedGlobals.push_back(Entry); |
| 480 | } |
| 481 | |
| 482 | return Entry; |
| 483 | } |
| 484 | |
Daniel Dunbar | 259d93d | 2008-08-12 03:39:23 +0000 | [diff] [blame] | 485 | llvm::Constant *CGObjCMac::GetMethodVarName(Selector Sel) { |
| 486 | llvm::GlobalVariable *&Entry = MethodVarNames[Sel]; |
| 487 | |
| 488 | if (!Entry) { |
| 489 | llvm::Constant *C = llvm::ConstantArray::get(Sel.getName()); |
| 490 | Entry = |
| 491 | new llvm::GlobalVariable(C->getType(), true, |
| 492 | llvm::GlobalValue::InternalLinkage, |
| 493 | C, "\01L_OBJC_METH_VAR_NAME_", |
| 494 | &CGM.getModule()); |
| 495 | Entry->setSection("__TEXT,__cstring,cstring_literals"); |
| 496 | UsedGlobals.push_back(Entry); |
| 497 | } |
| 498 | |
| 499 | return Entry; |
| 500 | } |
| 501 | |
Daniel Dunbar | f77ac86 | 2008-08-11 21:35:06 +0000 | [diff] [blame] | 502 | void CGObjCMac::FinishModule() { |
Daniel Dunbar | 4e2d7d0 | 2008-08-12 06:48:42 +0000 | [diff] [blame] | 503 | EmitModuleInfo(); |
| 504 | |
Daniel Dunbar | f77ac86 | 2008-08-11 21:35:06 +0000 | [diff] [blame] | 505 | std::vector<llvm::Constant*> Used; |
Daniel Dunbar | 4e2d7d0 | 2008-08-12 06:48:42 +0000 | [diff] [blame] | 506 | |
Daniel Dunbar | f77ac86 | 2008-08-11 21:35:06 +0000 | [diff] [blame] | 507 | llvm::Type *I8Ptr = llvm::PointerType::getUnqual(llvm::Type::Int8Ty); |
Daniel Dunbar | 4e2d7d0 | 2008-08-12 06:48:42 +0000 | [diff] [blame] | 508 | for (std::vector<llvm::GlobalVariable*>::iterator i = UsedGlobals.begin(), |
Daniel Dunbar | f77ac86 | 2008-08-11 21:35:06 +0000 | [diff] [blame] | 509 | e = UsedGlobals.end(); i != e; ++i) { |
| 510 | Used.push_back(llvm::ConstantExpr::getBitCast(*i, I8Ptr)); |
| 511 | } |
| 512 | |
| 513 | llvm::ArrayType *AT = llvm::ArrayType::get(I8Ptr, Used.size()); |
| 514 | llvm::GlobalValue *GV = |
| 515 | new llvm::GlobalVariable(AT, false, |
| 516 | llvm::GlobalValue::AppendingLinkage, |
| 517 | llvm::ConstantArray::get(AT, Used), |
| 518 | "llvm.used", |
| 519 | &CGM.getModule()); |
| 520 | |
| 521 | GV->setSection("llvm.metadata"); |
| 522 | } |
| 523 | |
| 524 | /* *** */ |
| 525 | |
Daniel Dunbar | bbce49b | 2008-08-12 00:12:39 +0000 | [diff] [blame] | 526 | ObjCTypesHelper::ObjCTypesHelper(CodeGen::CodeGenModule &cgm) |
| 527 | : CGM(cgm), |
| 528 | CFStringType(0), |
| 529 | CFConstantStringClassReference(0), |
Daniel Dunbar | 4e2d7d0 | 2008-08-12 06:48:42 +0000 | [diff] [blame] | 530 | MessageSendFn(0) |
Daniel Dunbar | bbce49b | 2008-08-12 00:12:39 +0000 | [diff] [blame] | 531 | { |
Daniel Dunbar | 4e2d7d0 | 2008-08-12 06:48:42 +0000 | [diff] [blame] | 532 | CodeGen::CodeGenTypes &Types = CGM.getTypes(); |
| 533 | ASTContext &Ctx = CGM.getContext(); |
| 534 | |
| 535 | LongTy = Types.ConvertType(Ctx.LongTy); |
| 536 | ObjectPtrTy = Types.ConvertType(Ctx.getObjCIdType()); |
| 537 | SelectorPtrTy = Types.ConvertType(Ctx.getObjCSelType()); |
| 538 | ProtocolPtrTy = Types.ConvertType(Ctx.getObjCProtoType()); |
| 539 | |
| 540 | SymtabTy = llvm::StructType::get(LongTy, |
| 541 | SelectorPtrTy, |
| 542 | Types.ConvertType(Ctx.ShortTy), |
| 543 | Types.ConvertType(Ctx.ShortTy), |
| 544 | NULL); |
| 545 | CGM.getModule().addTypeName("struct._objc_symtab", SymtabTy); |
| 546 | |
| 547 | ModuleTy = |
| 548 | llvm::StructType::get(LongTy, |
| 549 | LongTy, |
| 550 | llvm::PointerType::getUnqual(llvm::Type::Int8Ty), |
| 551 | llvm::PointerType::getUnqual(SymtabTy), |
| 552 | NULL); |
| 553 | CGM.getModule().addTypeName("struct._objc_module", ModuleTy); |
Daniel Dunbar | bbce49b | 2008-08-12 00:12:39 +0000 | [diff] [blame] | 554 | } |
| 555 | |
| 556 | ObjCTypesHelper::~ObjCTypesHelper() { |
| 557 | } |
| 558 | |
| 559 | const llvm::StructType *ObjCTypesHelper::getCFStringType() { |
| 560 | if (!CFStringType) { |
| 561 | CFStringType = |
| 562 | llvm::StructType::get(llvm::PointerType::getUnqual(llvm::Type::Int32Ty), |
| 563 | llvm::Type::Int32Ty, |
| 564 | llvm::PointerType::getUnqual(llvm::Type::Int8Ty), |
| 565 | LongTy, |
| 566 | NULL); |
| 567 | |
| 568 | CGM.getModule().addTypeName("struct.__builtin_CFString", CFStringType); |
| 569 | } |
| 570 | |
| 571 | return CFStringType; |
| 572 | } |
| 573 | |
| 574 | llvm::Constant *ObjCTypesHelper::getCFConstantStringClassReference() { |
| 575 | if (!CFConstantStringClassReference) { |
| 576 | llvm::GlobalValue *GV = |
| 577 | new llvm::GlobalVariable(llvm::ArrayType::get(llvm::Type::Int32Ty, 0), |
| 578 | false, |
| 579 | llvm::GlobalValue::ExternalLinkage, |
| 580 | 0, "__CFConstantStringClassReference", |
| 581 | &CGM.getModule()); |
| 582 | |
| 583 | // Decay to pointer. |
| 584 | CFConstantStringClassReference = getConstantGEP(GV, 0, 0); |
| 585 | } |
| 586 | |
| 587 | return CFConstantStringClassReference; |
| 588 | } |
| 589 | |
Daniel Dunbar | 259d93d | 2008-08-12 03:39:23 +0000 | [diff] [blame] | 590 | llvm::Function *ObjCTypesHelper::getMessageSendFn() { |
| 591 | if (!MessageSendFn) { |
| 592 | std::vector<const llvm::Type*> Params; |
| 593 | Params.push_back(ObjectPtrTy); |
| 594 | Params.push_back(SelectorPtrTy); |
| 595 | MessageSendFn = llvm::Function::Create(llvm::FunctionType::get(ObjectPtrTy, |
| 596 | Params, |
| 597 | true), |
| 598 | llvm::Function::ExternalLinkage, |
| 599 | "objc_msgSend", |
| 600 | &CGM.getModule()); |
| 601 | } |
| 602 | |
| 603 | return MessageSendFn; |
| 604 | } |
| 605 | |
Daniel Dunbar | bbce49b | 2008-08-12 00:12:39 +0000 | [diff] [blame] | 606 | /* *** */ |
| 607 | |
Daniel Dunbar | c17a4d3 | 2008-08-11 02:45:11 +0000 | [diff] [blame] | 608 | CodeGen::CGObjCRuntime *CodeGen::CreateMacObjCRuntime(CodeGen::CodeGenModule &CGM){ |
| 609 | return new CGObjCMac(CGM); |
| 610 | } |