CGObjC.cpp revision 219077
1//===---- CGBuiltin.cpp - Emit LLVM Code for builtins ---------------------===// 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 contains code to emit Objective-C code as LLVM code. 11// 12//===----------------------------------------------------------------------===// 13 14#include "CGDebugInfo.h" 15#include "CGObjCRuntime.h" 16#include "CodeGenFunction.h" 17#include "CodeGenModule.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/DeclObjC.h" 20#include "clang/AST/StmtObjC.h" 21#include "clang/Basic/Diagnostic.h" 22#include "llvm/ADT/STLExtras.h" 23#include "llvm/Target/TargetData.h" 24using namespace clang; 25using namespace CodeGen; 26 27/// Emits an instance of NSConstantString representing the object. 28llvm::Value *CodeGenFunction::EmitObjCStringLiteral(const ObjCStringLiteral *E) 29{ 30 llvm::Constant *C = 31 CGM.getObjCRuntime().GenerateConstantString(E->getString()); 32 // FIXME: This bitcast should just be made an invariant on the Runtime. 33 return llvm::ConstantExpr::getBitCast(C, ConvertType(E->getType())); 34} 35 36/// Emit a selector. 37llvm::Value *CodeGenFunction::EmitObjCSelectorExpr(const ObjCSelectorExpr *E) { 38 // Untyped selector. 39 // Note that this implementation allows for non-constant strings to be passed 40 // as arguments to @selector(). Currently, the only thing preventing this 41 // behaviour is the type checking in the front end. 42 return CGM.getObjCRuntime().GetSelector(Builder, E->getSelector()); 43} 44 45llvm::Value *CodeGenFunction::EmitObjCProtocolExpr(const ObjCProtocolExpr *E) { 46 // FIXME: This should pass the Decl not the name. 47 return CGM.getObjCRuntime().GenerateProtocolRef(Builder, E->getProtocol()); 48} 49 50 51RValue CodeGenFunction::EmitObjCMessageExpr(const ObjCMessageExpr *E, 52 ReturnValueSlot Return) { 53 // Only the lookup mechanism and first two arguments of the method 54 // implementation vary between runtimes. We can get the receiver and 55 // arguments in generic code. 56 57 CGObjCRuntime &Runtime = CGM.getObjCRuntime(); 58 bool isSuperMessage = false; 59 bool isClassMessage = false; 60 ObjCInterfaceDecl *OID = 0; 61 // Find the receiver 62 llvm::Value *Receiver = 0; 63 switch (E->getReceiverKind()) { 64 case ObjCMessageExpr::Instance: 65 Receiver = EmitScalarExpr(E->getInstanceReceiver()); 66 break; 67 68 case ObjCMessageExpr::Class: { 69 const ObjCObjectType *ObjTy 70 = E->getClassReceiver()->getAs<ObjCObjectType>(); 71 assert(ObjTy && "Invalid Objective-C class message send"); 72 OID = ObjTy->getInterface(); 73 assert(OID && "Invalid Objective-C class message send"); 74 Receiver = Runtime.GetClass(Builder, OID); 75 isClassMessage = true; 76 break; 77 } 78 79 case ObjCMessageExpr::SuperInstance: 80 Receiver = LoadObjCSelf(); 81 isSuperMessage = true; 82 break; 83 84 case ObjCMessageExpr::SuperClass: 85 Receiver = LoadObjCSelf(); 86 isSuperMessage = true; 87 isClassMessage = true; 88 break; 89 } 90 91 CallArgList Args; 92 EmitCallArgs(Args, E->getMethodDecl(), E->arg_begin(), E->arg_end()); 93 94 QualType ResultType = 95 E->getMethodDecl() ? E->getMethodDecl()->getResultType() : E->getType(); 96 97 if (isSuperMessage) { 98 // super is only valid in an Objective-C method 99 const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CurFuncDecl); 100 bool isCategoryImpl = isa<ObjCCategoryImplDecl>(OMD->getDeclContext()); 101 return Runtime.GenerateMessageSendSuper(*this, Return, ResultType, 102 E->getSelector(), 103 OMD->getClassInterface(), 104 isCategoryImpl, 105 Receiver, 106 isClassMessage, 107 Args, 108 E->getMethodDecl()); 109 } 110 111 return Runtime.GenerateMessageSend(*this, Return, ResultType, 112 E->getSelector(), 113 Receiver, Args, OID, 114 E->getMethodDecl()); 115} 116 117/// StartObjCMethod - Begin emission of an ObjCMethod. This generates 118/// the LLVM function and sets the other context used by 119/// CodeGenFunction. 120void CodeGenFunction::StartObjCMethod(const ObjCMethodDecl *OMD, 121 const ObjCContainerDecl *CD) { 122 FunctionArgList Args; 123 // Check if we should generate debug info for this method. 124 if (CGM.getDebugInfo() && !OMD->hasAttr<NoDebugAttr>()) 125 DebugInfo = CGM.getDebugInfo(); 126 127 llvm::Function *Fn = CGM.getObjCRuntime().GenerateMethod(OMD, CD); 128 129 const CGFunctionInfo &FI = CGM.getTypes().getFunctionInfo(OMD); 130 CGM.SetInternalFunctionAttributes(OMD, Fn, FI); 131 132 Args.push_back(std::make_pair(OMD->getSelfDecl(), 133 OMD->getSelfDecl()->getType())); 134 Args.push_back(std::make_pair(OMD->getCmdDecl(), 135 OMD->getCmdDecl()->getType())); 136 137 for (ObjCMethodDecl::param_iterator PI = OMD->param_begin(), 138 E = OMD->param_end(); PI != E; ++PI) 139 Args.push_back(std::make_pair(*PI, (*PI)->getType())); 140 141 CurGD = OMD; 142 143 StartFunction(OMD, OMD->getResultType(), Fn, Args, OMD->getLocStart()); 144} 145 146void CodeGenFunction::GenerateObjCGetterBody(ObjCIvarDecl *Ivar, 147 bool IsAtomic, bool IsStrong) { 148 LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), 149 Ivar, 0); 150 llvm::Value *GetCopyStructFn = 151 CGM.getObjCRuntime().GetGetStructFunction(); 152 CodeGenTypes &Types = CGM.getTypes(); 153 // objc_copyStruct (ReturnValue, &structIvar, 154 // sizeof (Type of Ivar), isAtomic, false); 155 CallArgList Args; 156 RValue RV = RValue::get(Builder.CreateBitCast(ReturnValue, 157 Types.ConvertType(getContext().VoidPtrTy))); 158 Args.push_back(std::make_pair(RV, getContext().VoidPtrTy)); 159 RV = RValue::get(Builder.CreateBitCast(LV.getAddress(), 160 Types.ConvertType(getContext().VoidPtrTy))); 161 Args.push_back(std::make_pair(RV, getContext().VoidPtrTy)); 162 // sizeof (Type of Ivar) 163 CharUnits Size = getContext().getTypeSizeInChars(Ivar->getType()); 164 llvm::Value *SizeVal = 165 llvm::ConstantInt::get(Types.ConvertType(getContext().LongTy), 166 Size.getQuantity()); 167 Args.push_back(std::make_pair(RValue::get(SizeVal), 168 getContext().LongTy)); 169 llvm::Value *isAtomic = 170 llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), 171 IsAtomic ? 1 : 0); 172 Args.push_back(std::make_pair(RValue::get(isAtomic), 173 getContext().BoolTy)); 174 llvm::Value *hasStrong = 175 llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), 176 IsStrong ? 1 : 0); 177 Args.push_back(std::make_pair(RValue::get(hasStrong), 178 getContext().BoolTy)); 179 EmitCall(Types.getFunctionInfo(getContext().VoidTy, Args, 180 FunctionType::ExtInfo()), 181 GetCopyStructFn, ReturnValueSlot(), Args); 182} 183 184/// Generate an Objective-C method. An Objective-C method is a C function with 185/// its pointer, name, and types registered in the class struture. 186void CodeGenFunction::GenerateObjCMethod(const ObjCMethodDecl *OMD) { 187 StartObjCMethod(OMD, OMD->getClassInterface()); 188 EmitStmt(OMD->getBody()); 189 FinishFunction(OMD->getBodyRBrace()); 190} 191 192// FIXME: I wasn't sure about the synthesis approach. If we end up generating an 193// AST for the whole body we can just fall back to having a GenerateFunction 194// which takes the body Stmt. 195 196/// GenerateObjCGetter - Generate an Objective-C property getter 197/// function. The given Decl must be an ObjCImplementationDecl. @synthesize 198/// is illegal within a category. 199void CodeGenFunction::GenerateObjCGetter(ObjCImplementationDecl *IMP, 200 const ObjCPropertyImplDecl *PID) { 201 ObjCIvarDecl *Ivar = PID->getPropertyIvarDecl(); 202 const ObjCPropertyDecl *PD = PID->getPropertyDecl(); 203 bool IsAtomic = 204 !(PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic); 205 ObjCMethodDecl *OMD = PD->getGetterMethodDecl(); 206 assert(OMD && "Invalid call to generate getter (empty method)"); 207 StartObjCMethod(OMD, IMP->getClassInterface()); 208 209 // Determine if we should use an objc_getProperty call for 210 // this. Non-atomic properties are directly evaluated. 211 // atomic 'copy' and 'retain' properties are also directly 212 // evaluated in gc-only mode. 213 if (CGM.getLangOptions().getGCMode() != LangOptions::GCOnly && 214 IsAtomic && 215 (PD->getSetterKind() == ObjCPropertyDecl::Copy || 216 PD->getSetterKind() == ObjCPropertyDecl::Retain)) { 217 llvm::Value *GetPropertyFn = 218 CGM.getObjCRuntime().GetPropertyGetFunction(); 219 220 if (!GetPropertyFn) { 221 CGM.ErrorUnsupported(PID, "Obj-C getter requiring atomic copy"); 222 FinishFunction(); 223 return; 224 } 225 226 // Return (ivar-type) objc_getProperty((id) self, _cmd, offset, true). 227 // FIXME: Can't this be simpler? This might even be worse than the 228 // corresponding gcc code. 229 CodeGenTypes &Types = CGM.getTypes(); 230 ValueDecl *Cmd = OMD->getCmdDecl(); 231 llvm::Value *CmdVal = Builder.CreateLoad(LocalDeclMap[Cmd], "cmd"); 232 QualType IdTy = getContext().getObjCIdType(); 233 llvm::Value *SelfAsId = 234 Builder.CreateBitCast(LoadObjCSelf(), Types.ConvertType(IdTy)); 235 llvm::Value *Offset = EmitIvarOffset(IMP->getClassInterface(), Ivar); 236 llvm::Value *True = 237 llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), 1); 238 CallArgList Args; 239 Args.push_back(std::make_pair(RValue::get(SelfAsId), IdTy)); 240 Args.push_back(std::make_pair(RValue::get(CmdVal), Cmd->getType())); 241 Args.push_back(std::make_pair(RValue::get(Offset), getContext().LongTy)); 242 Args.push_back(std::make_pair(RValue::get(True), getContext().BoolTy)); 243 // FIXME: We shouldn't need to get the function info here, the 244 // runtime already should have computed it to build the function. 245 RValue RV = EmitCall(Types.getFunctionInfo(PD->getType(), Args, 246 FunctionType::ExtInfo()), 247 GetPropertyFn, ReturnValueSlot(), Args); 248 // We need to fix the type here. Ivars with copy & retain are 249 // always objects so we don't need to worry about complex or 250 // aggregates. 251 RV = RValue::get(Builder.CreateBitCast(RV.getScalarVal(), 252 Types.ConvertType(PD->getType()))); 253 EmitReturnOfRValue(RV, PD->getType()); 254 } else { 255 const llvm::Triple &Triple = getContext().Target.getTriple(); 256 QualType IVART = Ivar->getType(); 257 if (IsAtomic && 258 IVART->isScalarType() && 259 (Triple.getArch() == llvm::Triple::arm || 260 Triple.getArch() == llvm::Triple::thumb) && 261 (getContext().getTypeSizeInChars(IVART) 262 > CharUnits::fromQuantity(4)) && 263 CGM.getObjCRuntime().GetGetStructFunction()) { 264 GenerateObjCGetterBody(Ivar, true, false); 265 } 266 else if (IVART->isAnyComplexType()) { 267 LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), 268 Ivar, 0); 269 ComplexPairTy Pair = LoadComplexFromAddr(LV.getAddress(), 270 LV.isVolatileQualified()); 271 StoreComplexToAddr(Pair, ReturnValue, LV.isVolatileQualified()); 272 } 273 else if (hasAggregateLLVMType(IVART)) { 274 bool IsStrong = false; 275 if ((IsAtomic || (IsStrong = IvarTypeWithAggrGCObjects(IVART))) 276 && CurFnInfo->getReturnInfo().getKind() == ABIArgInfo::Indirect 277 && CGM.getObjCRuntime().GetGetStructFunction()) { 278 GenerateObjCGetterBody(Ivar, IsAtomic, IsStrong); 279 } 280 else { 281 if (PID->getGetterCXXConstructor()) { 282 ReturnStmt *Stmt = 283 new (getContext()) ReturnStmt(SourceLocation(), 284 PID->getGetterCXXConstructor(), 285 0); 286 EmitReturnStmt(*Stmt); 287 } 288 else { 289 LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), 290 Ivar, 0); 291 EmitAggregateCopy(ReturnValue, LV.getAddress(), IVART); 292 } 293 } 294 } 295 else { 296 LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), 297 Ivar, 0); 298 CodeGenTypes &Types = CGM.getTypes(); 299 RValue RV = EmitLoadOfLValue(LV, IVART); 300 RV = RValue::get(Builder.CreateBitCast(RV.getScalarVal(), 301 Types.ConvertType(PD->getType()))); 302 EmitReturnOfRValue(RV, PD->getType()); 303 } 304 } 305 306 FinishFunction(); 307} 308 309void CodeGenFunction::GenerateObjCAtomicSetterBody(ObjCMethodDecl *OMD, 310 ObjCIvarDecl *Ivar) { 311 // objc_copyStruct (&structIvar, &Arg, 312 // sizeof (struct something), true, false); 313 llvm::Value *GetCopyStructFn = 314 CGM.getObjCRuntime().GetSetStructFunction(); 315 CodeGenTypes &Types = CGM.getTypes(); 316 CallArgList Args; 317 LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), Ivar, 0); 318 RValue RV = 319 RValue::get(Builder.CreateBitCast(LV.getAddress(), 320 Types.ConvertType(getContext().VoidPtrTy))); 321 Args.push_back(std::make_pair(RV, getContext().VoidPtrTy)); 322 llvm::Value *Arg = LocalDeclMap[*OMD->param_begin()]; 323 llvm::Value *ArgAsPtrTy = 324 Builder.CreateBitCast(Arg, 325 Types.ConvertType(getContext().VoidPtrTy)); 326 RV = RValue::get(ArgAsPtrTy); 327 Args.push_back(std::make_pair(RV, getContext().VoidPtrTy)); 328 // sizeof (Type of Ivar) 329 CharUnits Size = getContext().getTypeSizeInChars(Ivar->getType()); 330 llvm::Value *SizeVal = 331 llvm::ConstantInt::get(Types.ConvertType(getContext().LongTy), 332 Size.getQuantity()); 333 Args.push_back(std::make_pair(RValue::get(SizeVal), 334 getContext().LongTy)); 335 llvm::Value *True = 336 llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), 1); 337 Args.push_back(std::make_pair(RValue::get(True), getContext().BoolTy)); 338 llvm::Value *False = 339 llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), 0); 340 Args.push_back(std::make_pair(RValue::get(False), getContext().BoolTy)); 341 EmitCall(Types.getFunctionInfo(getContext().VoidTy, Args, 342 FunctionType::ExtInfo()), 343 GetCopyStructFn, ReturnValueSlot(), Args); 344} 345 346/// GenerateObjCSetter - Generate an Objective-C property setter 347/// function. The given Decl must be an ObjCImplementationDecl. @synthesize 348/// is illegal within a category. 349void CodeGenFunction::GenerateObjCSetter(ObjCImplementationDecl *IMP, 350 const ObjCPropertyImplDecl *PID) { 351 ObjCIvarDecl *Ivar = PID->getPropertyIvarDecl(); 352 const ObjCPropertyDecl *PD = PID->getPropertyDecl(); 353 ObjCMethodDecl *OMD = PD->getSetterMethodDecl(); 354 assert(OMD && "Invalid call to generate setter (empty method)"); 355 StartObjCMethod(OMD, IMP->getClassInterface()); 356 357 bool IsCopy = PD->getSetterKind() == ObjCPropertyDecl::Copy; 358 bool IsAtomic = 359 !(PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic); 360 361 // Determine if we should use an objc_setProperty call for 362 // this. Properties with 'copy' semantics always use it, as do 363 // non-atomic properties with 'release' semantics as long as we are 364 // not in gc-only mode. 365 if (IsCopy || 366 (CGM.getLangOptions().getGCMode() != LangOptions::GCOnly && 367 PD->getSetterKind() == ObjCPropertyDecl::Retain)) { 368 llvm::Value *SetPropertyFn = 369 CGM.getObjCRuntime().GetPropertySetFunction(); 370 371 if (!SetPropertyFn) { 372 CGM.ErrorUnsupported(PID, "Obj-C getter requiring atomic copy"); 373 FinishFunction(); 374 return; 375 } 376 377 // Emit objc_setProperty((id) self, _cmd, offset, arg, 378 // <is-atomic>, <is-copy>). 379 // FIXME: Can't this be simpler? This might even be worse than the 380 // corresponding gcc code. 381 CodeGenTypes &Types = CGM.getTypes(); 382 ValueDecl *Cmd = OMD->getCmdDecl(); 383 llvm::Value *CmdVal = Builder.CreateLoad(LocalDeclMap[Cmd], "cmd"); 384 QualType IdTy = getContext().getObjCIdType(); 385 llvm::Value *SelfAsId = 386 Builder.CreateBitCast(LoadObjCSelf(), Types.ConvertType(IdTy)); 387 llvm::Value *Offset = EmitIvarOffset(IMP->getClassInterface(), Ivar); 388 llvm::Value *Arg = LocalDeclMap[*OMD->param_begin()]; 389 llvm::Value *ArgAsId = 390 Builder.CreateBitCast(Builder.CreateLoad(Arg, "arg"), 391 Types.ConvertType(IdTy)); 392 llvm::Value *True = 393 llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), 1); 394 llvm::Value *False = 395 llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), 0); 396 CallArgList Args; 397 Args.push_back(std::make_pair(RValue::get(SelfAsId), IdTy)); 398 Args.push_back(std::make_pair(RValue::get(CmdVal), Cmd->getType())); 399 Args.push_back(std::make_pair(RValue::get(Offset), getContext().LongTy)); 400 Args.push_back(std::make_pair(RValue::get(ArgAsId), IdTy)); 401 Args.push_back(std::make_pair(RValue::get(IsAtomic ? True : False), 402 getContext().BoolTy)); 403 Args.push_back(std::make_pair(RValue::get(IsCopy ? True : False), 404 getContext().BoolTy)); 405 // FIXME: We shouldn't need to get the function info here, the runtime 406 // already should have computed it to build the function. 407 EmitCall(Types.getFunctionInfo(getContext().VoidTy, Args, 408 FunctionType::ExtInfo()), 409 SetPropertyFn, 410 ReturnValueSlot(), Args); 411 } else if (IsAtomic && hasAggregateLLVMType(Ivar->getType()) && 412 !Ivar->getType()->isAnyComplexType() && 413 IndirectObjCSetterArg(*CurFnInfo) 414 && CGM.getObjCRuntime().GetSetStructFunction()) { 415 // objc_copyStruct (&structIvar, &Arg, 416 // sizeof (struct something), true, false); 417 GenerateObjCAtomicSetterBody(OMD, Ivar); 418 } else if (PID->getSetterCXXAssignment()) { 419 EmitIgnoredExpr(PID->getSetterCXXAssignment()); 420 } else { 421 const llvm::Triple &Triple = getContext().Target.getTriple(); 422 QualType IVART = Ivar->getType(); 423 if (IsAtomic && 424 IVART->isScalarType() && 425 (Triple.getArch() == llvm::Triple::arm || 426 Triple.getArch() == llvm::Triple::thumb) && 427 (getContext().getTypeSizeInChars(IVART) 428 > CharUnits::fromQuantity(4)) && 429 CGM.getObjCRuntime().GetGetStructFunction()) { 430 GenerateObjCAtomicSetterBody(OMD, Ivar); 431 } 432 else { 433 // FIXME: Find a clean way to avoid AST node creation. 434 SourceLocation Loc = PD->getLocation(); 435 ValueDecl *Self = OMD->getSelfDecl(); 436 ObjCIvarDecl *Ivar = PID->getPropertyIvarDecl(); 437 DeclRefExpr Base(Self, Self->getType(), VK_RValue, Loc); 438 ParmVarDecl *ArgDecl = *OMD->param_begin(); 439 DeclRefExpr Arg(ArgDecl, ArgDecl->getType(), VK_LValue, Loc); 440 ObjCIvarRefExpr IvarRef(Ivar, Ivar->getType(), Loc, &Base, true, true); 441 442 // The property type can differ from the ivar type in some situations with 443 // Objective-C pointer types, we can always bit cast the RHS in these cases. 444 if (getContext().getCanonicalType(Ivar->getType()) != 445 getContext().getCanonicalType(ArgDecl->getType())) { 446 ImplicitCastExpr ArgCasted(ImplicitCastExpr::OnStack, 447 Ivar->getType(), CK_BitCast, &Arg, 448 VK_RValue); 449 BinaryOperator Assign(&IvarRef, &ArgCasted, BO_Assign, 450 Ivar->getType(), VK_RValue, OK_Ordinary, Loc); 451 EmitStmt(&Assign); 452 } else { 453 BinaryOperator Assign(&IvarRef, &Arg, BO_Assign, 454 Ivar->getType(), VK_RValue, OK_Ordinary, Loc); 455 EmitStmt(&Assign); 456 } 457 } 458 } 459 460 FinishFunction(); 461} 462 463void CodeGenFunction::GenerateObjCCtorDtorMethod(ObjCImplementationDecl *IMP, 464 ObjCMethodDecl *MD, 465 bool ctor) { 466 llvm::SmallVector<CXXCtorInitializer *, 8> IvarInitializers; 467 MD->createImplicitParams(CGM.getContext(), IMP->getClassInterface()); 468 StartObjCMethod(MD, IMP->getClassInterface()); 469 for (ObjCImplementationDecl::init_const_iterator B = IMP->init_begin(), 470 E = IMP->init_end(); B != E; ++B) { 471 CXXCtorInitializer *Member = (*B); 472 IvarInitializers.push_back(Member); 473 } 474 if (ctor) { 475 for (unsigned I = 0, E = IvarInitializers.size(); I != E; ++I) { 476 CXXCtorInitializer *IvarInit = IvarInitializers[I]; 477 FieldDecl *Field = IvarInit->getAnyMember(); 478 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(Field); 479 LValue LV = EmitLValueForIvar(TypeOfSelfObject(), 480 LoadObjCSelf(), Ivar, 0); 481 EmitAggExpr(IvarInit->getInit(), AggValueSlot::forLValue(LV, true)); 482 } 483 // constructor returns 'self'. 484 CodeGenTypes &Types = CGM.getTypes(); 485 QualType IdTy(CGM.getContext().getObjCIdType()); 486 llvm::Value *SelfAsId = 487 Builder.CreateBitCast(LoadObjCSelf(), Types.ConvertType(IdTy)); 488 EmitReturnOfRValue(RValue::get(SelfAsId), IdTy); 489 } else { 490 // dtor 491 for (size_t i = IvarInitializers.size(); i > 0; --i) { 492 FieldDecl *Field = IvarInitializers[i - 1]->getAnyMember(); 493 QualType FieldType = Field->getType(); 494 const ConstantArrayType *Array = 495 getContext().getAsConstantArrayType(FieldType); 496 if (Array) 497 FieldType = getContext().getBaseElementType(FieldType); 498 499 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(Field); 500 LValue LV = EmitLValueForIvar(TypeOfSelfObject(), 501 LoadObjCSelf(), Ivar, 0); 502 const RecordType *RT = FieldType->getAs<RecordType>(); 503 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 504 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(); 505 if (!Dtor->isTrivial()) { 506 if (Array) { 507 const llvm::Type *BasePtr = ConvertType(FieldType); 508 BasePtr = llvm::PointerType::getUnqual(BasePtr); 509 llvm::Value *BaseAddrPtr = 510 Builder.CreateBitCast(LV.getAddress(), BasePtr); 511 EmitCXXAggrDestructorCall(Dtor, 512 Array, BaseAddrPtr); 513 } else { 514 EmitCXXDestructorCall(Dtor, 515 Dtor_Complete, /*ForVirtualBase=*/false, 516 LV.getAddress()); 517 } 518 } 519 } 520 } 521 FinishFunction(); 522} 523 524bool CodeGenFunction::IndirectObjCSetterArg(const CGFunctionInfo &FI) { 525 CGFunctionInfo::const_arg_iterator it = FI.arg_begin(); 526 it++; it++; 527 const ABIArgInfo &AI = it->info; 528 // FIXME. Is this sufficient check? 529 return (AI.getKind() == ABIArgInfo::Indirect); 530} 531 532bool CodeGenFunction::IvarTypeWithAggrGCObjects(QualType Ty) { 533 if (CGM.getLangOptions().getGCMode() == LangOptions::NonGC) 534 return false; 535 if (const RecordType *FDTTy = Ty.getTypePtr()->getAs<RecordType>()) 536 return FDTTy->getDecl()->hasObjectMember(); 537 return false; 538} 539 540llvm::Value *CodeGenFunction::LoadObjCSelf() { 541 const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CurFuncDecl); 542 return Builder.CreateLoad(LocalDeclMap[OMD->getSelfDecl()], "self"); 543} 544 545QualType CodeGenFunction::TypeOfSelfObject() { 546 const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CurFuncDecl); 547 ImplicitParamDecl *selfDecl = OMD->getSelfDecl(); 548 const ObjCObjectPointerType *PTy = cast<ObjCObjectPointerType>( 549 getContext().getCanonicalType(selfDecl->getType())); 550 return PTy->getPointeeType(); 551} 552 553LValue 554CodeGenFunction::EmitObjCPropertyRefLValue(const ObjCPropertyRefExpr *E) { 555 // This is a special l-value that just issues sends when we load or 556 // store through it. 557 558 // For certain base kinds, we need to emit the base immediately. 559 llvm::Value *Base; 560 if (E->isSuperReceiver()) 561 Base = LoadObjCSelf(); 562 else if (E->isClassReceiver()) 563 Base = CGM.getObjCRuntime().GetClass(Builder, E->getClassReceiver()); 564 else 565 Base = EmitScalarExpr(E->getBase()); 566 return LValue::MakePropertyRef(E, Base); 567} 568 569static RValue GenerateMessageSendSuper(CodeGenFunction &CGF, 570 ReturnValueSlot Return, 571 QualType ResultType, 572 Selector S, 573 llvm::Value *Receiver, 574 const CallArgList &CallArgs) { 575 const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CGF.CurFuncDecl); 576 bool isClassMessage = OMD->isClassMethod(); 577 bool isCategoryImpl = isa<ObjCCategoryImplDecl>(OMD->getDeclContext()); 578 return CGF.CGM.getObjCRuntime() 579 .GenerateMessageSendSuper(CGF, Return, ResultType, 580 S, OMD->getClassInterface(), 581 isCategoryImpl, Receiver, 582 isClassMessage, CallArgs); 583} 584 585RValue CodeGenFunction::EmitLoadOfPropertyRefLValue(LValue LV, 586 ReturnValueSlot Return) { 587 const ObjCPropertyRefExpr *E = LV.getPropertyRefExpr(); 588 QualType ResultType; 589 Selector S; 590 if (E->isExplicitProperty()) { 591 const ObjCPropertyDecl *Property = E->getExplicitProperty(); 592 S = Property->getGetterName(); 593 ResultType = E->getType(); 594 } else { 595 const ObjCMethodDecl *Getter = E->getImplicitPropertyGetter(); 596 S = Getter->getSelector(); 597 ResultType = Getter->getResultType(); // with reference! 598 } 599 600 llvm::Value *Receiver = LV.getPropertyRefBaseAddr(); 601 602 // Accesses to 'super' follow a different code path. 603 if (E->isSuperReceiver()) 604 return GenerateMessageSendSuper(*this, Return, ResultType, 605 S, Receiver, CallArgList()); 606 607 const ObjCInterfaceDecl *ReceiverClass 608 = (E->isClassReceiver() ? E->getClassReceiver() : 0); 609 return CGM.getObjCRuntime(). 610 GenerateMessageSend(*this, Return, ResultType, S, 611 Receiver, CallArgList(), ReceiverClass); 612} 613 614void CodeGenFunction::EmitStoreThroughPropertyRefLValue(RValue Src, 615 LValue Dst) { 616 const ObjCPropertyRefExpr *E = Dst.getPropertyRefExpr(); 617 Selector S = E->getSetterSelector(); 618 QualType ArgType; 619 if (E->isImplicitProperty()) { 620 const ObjCMethodDecl *Setter = E->getImplicitPropertySetter(); 621 ObjCMethodDecl::param_iterator P = Setter->param_begin(); 622 ArgType = (*P)->getType(); 623 } else { 624 ArgType = E->getType(); 625 } 626 // FIXME. Other than scalars, AST is not adequate for setter and 627 // getter type mismatches which require conversion. 628 if (Src.isScalar()) { 629 llvm::Value *SrcVal = Src.getScalarVal(); 630 QualType DstType = getContext().getCanonicalType(ArgType); 631 const llvm::Type *DstTy = ConvertType(DstType); 632 if (SrcVal->getType() != DstTy) 633 Src = 634 RValue::get(EmitScalarConversion(SrcVal, E->getType(), DstType)); 635 } 636 637 CallArgList Args; 638 Args.push_back(std::make_pair(Src, ArgType)); 639 640 llvm::Value *Receiver = Dst.getPropertyRefBaseAddr(); 641 QualType ResultType = getContext().VoidTy; 642 643 if (E->isSuperReceiver()) { 644 GenerateMessageSendSuper(*this, ReturnValueSlot(), 645 ResultType, S, Receiver, Args); 646 return; 647 } 648 649 const ObjCInterfaceDecl *ReceiverClass 650 = (E->isClassReceiver() ? E->getClassReceiver() : 0); 651 652 CGM.getObjCRuntime().GenerateMessageSend(*this, ReturnValueSlot(), 653 ResultType, S, Receiver, Args, 654 ReceiverClass); 655} 656 657void CodeGenFunction::EmitObjCForCollectionStmt(const ObjCForCollectionStmt &S){ 658 llvm::Constant *EnumerationMutationFn = 659 CGM.getObjCRuntime().EnumerationMutationFunction(); 660 661 if (!EnumerationMutationFn) { 662 CGM.ErrorUnsupported(&S, "Obj-C fast enumeration for this runtime"); 663 return; 664 } 665 666 // The local variable comes into scope immediately. 667 AutoVarEmission variable = AutoVarEmission::invalid(); 668 if (const DeclStmt *SD = dyn_cast<DeclStmt>(S.getElement())) 669 variable = EmitAutoVarAlloca(*cast<VarDecl>(SD->getSingleDecl())); 670 671 CGDebugInfo *DI = getDebugInfo(); 672 if (DI) { 673 DI->setLocation(S.getSourceRange().getBegin()); 674 DI->EmitRegionStart(Builder); 675 } 676 677 JumpDest LoopEnd = getJumpDestInCurrentScope("forcoll.end"); 678 JumpDest AfterBody = getJumpDestInCurrentScope("forcoll.next"); 679 680 // Fast enumeration state. 681 QualType StateTy = getContext().getObjCFastEnumerationStateType(); 682 llvm::Value *StatePtr = CreateMemTemp(StateTy, "state.ptr"); 683 EmitNullInitialization(StatePtr, StateTy); 684 685 // Number of elements in the items array. 686 static const unsigned NumItems = 16; 687 688 // Fetch the countByEnumeratingWithState:objects:count: selector. 689 IdentifierInfo *II[] = { 690 &CGM.getContext().Idents.get("countByEnumeratingWithState"), 691 &CGM.getContext().Idents.get("objects"), 692 &CGM.getContext().Idents.get("count") 693 }; 694 Selector FastEnumSel = 695 CGM.getContext().Selectors.getSelector(llvm::array_lengthof(II), &II[0]); 696 697 QualType ItemsTy = 698 getContext().getConstantArrayType(getContext().getObjCIdType(), 699 llvm::APInt(32, NumItems), 700 ArrayType::Normal, 0); 701 llvm::Value *ItemsPtr = CreateMemTemp(ItemsTy, "items.ptr"); 702 703 // Emit the collection pointer. 704 llvm::Value *Collection = EmitScalarExpr(S.getCollection()); 705 706 // Send it our message: 707 CallArgList Args; 708 709 // The first argument is a temporary of the enumeration-state type. 710 Args.push_back(std::make_pair(RValue::get(StatePtr), 711 getContext().getPointerType(StateTy))); 712 713 // The second argument is a temporary array with space for NumItems 714 // pointers. We'll actually be loading elements from the array 715 // pointer written into the control state; this buffer is so that 716 // collections that *aren't* backed by arrays can still queue up 717 // batches of elements. 718 Args.push_back(std::make_pair(RValue::get(ItemsPtr), 719 getContext().getPointerType(ItemsTy))); 720 721 // The third argument is the capacity of that temporary array. 722 const llvm::Type *UnsignedLongLTy = ConvertType(getContext().UnsignedLongTy); 723 llvm::Constant *Count = llvm::ConstantInt::get(UnsignedLongLTy, NumItems); 724 Args.push_back(std::make_pair(RValue::get(Count), 725 getContext().UnsignedLongTy)); 726 727 // Start the enumeration. 728 RValue CountRV = 729 CGM.getObjCRuntime().GenerateMessageSend(*this, ReturnValueSlot(), 730 getContext().UnsignedLongTy, 731 FastEnumSel, 732 Collection, Args); 733 734 // The initial number of objects that were returned in the buffer. 735 llvm::Value *initialBufferLimit = CountRV.getScalarVal(); 736 737 llvm::BasicBlock *EmptyBB = createBasicBlock("forcoll.empty"); 738 llvm::BasicBlock *LoopInitBB = createBasicBlock("forcoll.loopinit"); 739 740 llvm::Value *zero = llvm::Constant::getNullValue(UnsignedLongLTy); 741 742 // If the limit pointer was zero to begin with, the collection is 743 // empty; skip all this. 744 Builder.CreateCondBr(Builder.CreateICmpEQ(initialBufferLimit, zero, "iszero"), 745 EmptyBB, LoopInitBB); 746 747 // Otherwise, initialize the loop. 748 EmitBlock(LoopInitBB); 749 750 // Save the initial mutations value. This is the value at an 751 // address that was written into the state object by 752 // countByEnumeratingWithState:objects:count:. 753 llvm::Value *StateMutationsPtrPtr = 754 Builder.CreateStructGEP(StatePtr, 2, "mutationsptr.ptr"); 755 llvm::Value *StateMutationsPtr = Builder.CreateLoad(StateMutationsPtrPtr, 756 "mutationsptr"); 757 758 llvm::Value *initialMutations = 759 Builder.CreateLoad(StateMutationsPtr, "forcoll.initial-mutations"); 760 761 // Start looping. This is the point we return to whenever we have a 762 // fresh, non-empty batch of objects. 763 llvm::BasicBlock *LoopBodyBB = createBasicBlock("forcoll.loopbody"); 764 EmitBlock(LoopBodyBB); 765 766 // The current index into the buffer. 767 llvm::PHINode *index = Builder.CreatePHI(UnsignedLongLTy, "forcoll.index"); 768 index->addIncoming(zero, LoopInitBB); 769 770 // The current buffer size. 771 llvm::PHINode *count = Builder.CreatePHI(UnsignedLongLTy, "forcoll.count"); 772 count->addIncoming(initialBufferLimit, LoopInitBB); 773 774 // Check whether the mutations value has changed from where it was 775 // at start. StateMutationsPtr should actually be invariant between 776 // refreshes. 777 StateMutationsPtr = Builder.CreateLoad(StateMutationsPtrPtr, "mutationsptr"); 778 llvm::Value *currentMutations 779 = Builder.CreateLoad(StateMutationsPtr, "statemutations"); 780 781 llvm::BasicBlock *WasMutatedBB = createBasicBlock("forcoll.mutated"); 782 llvm::BasicBlock *WasNotMutatedBB = createBasicBlock("forcool.notmutated"); 783 784 Builder.CreateCondBr(Builder.CreateICmpEQ(currentMutations, initialMutations), 785 WasNotMutatedBB, WasMutatedBB); 786 787 // If so, call the enumeration-mutation function. 788 EmitBlock(WasMutatedBB); 789 llvm::Value *V = 790 Builder.CreateBitCast(Collection, 791 ConvertType(getContext().getObjCIdType()), 792 "tmp"); 793 CallArgList Args2; 794 Args2.push_back(std::make_pair(RValue::get(V), 795 getContext().getObjCIdType())); 796 // FIXME: We shouldn't need to get the function info here, the runtime already 797 // should have computed it to build the function. 798 EmitCall(CGM.getTypes().getFunctionInfo(getContext().VoidTy, Args2, 799 FunctionType::ExtInfo()), 800 EnumerationMutationFn, ReturnValueSlot(), Args2); 801 802 // Otherwise, or if the mutation function returns, just continue. 803 EmitBlock(WasNotMutatedBB); 804 805 // Initialize the element variable. 806 RunCleanupsScope elementVariableScope(*this); 807 bool elementIsVariable; 808 LValue elementLValue; 809 QualType elementType; 810 if (const DeclStmt *SD = dyn_cast<DeclStmt>(S.getElement())) { 811 // Initialize the variable, in case it's a __block variable or something. 812 EmitAutoVarInit(variable); 813 814 const VarDecl* D = cast<VarDecl>(SD->getSingleDecl()); 815 DeclRefExpr tempDRE(const_cast<VarDecl*>(D), D->getType(), 816 VK_LValue, SourceLocation()); 817 elementLValue = EmitLValue(&tempDRE); 818 elementType = D->getType(); 819 elementIsVariable = true; 820 } else { 821 elementLValue = LValue(); // suppress warning 822 elementType = cast<Expr>(S.getElement())->getType(); 823 elementIsVariable = false; 824 } 825 const llvm::Type *convertedElementType = ConvertType(elementType); 826 827 // Fetch the buffer out of the enumeration state. 828 // TODO: this pointer should actually be invariant between 829 // refreshes, which would help us do certain loop optimizations. 830 llvm::Value *StateItemsPtr = 831 Builder.CreateStructGEP(StatePtr, 1, "stateitems.ptr"); 832 llvm::Value *EnumStateItems = 833 Builder.CreateLoad(StateItemsPtr, "stateitems"); 834 835 // Fetch the value at the current index from the buffer. 836 llvm::Value *CurrentItemPtr = 837 Builder.CreateGEP(EnumStateItems, index, "currentitem.ptr"); 838 llvm::Value *CurrentItem = Builder.CreateLoad(CurrentItemPtr); 839 840 // Cast that value to the right type. 841 CurrentItem = Builder.CreateBitCast(CurrentItem, convertedElementType, 842 "currentitem"); 843 844 // Make sure we have an l-value. Yes, this gets evaluated every 845 // time through the loop. 846 if (!elementIsVariable) 847 elementLValue = EmitLValue(cast<Expr>(S.getElement())); 848 849 EmitStoreThroughLValue(RValue::get(CurrentItem), elementLValue, elementType); 850 851 // If we do have an element variable, this assignment is the end of 852 // its initialization. 853 if (elementIsVariable) 854 EmitAutoVarCleanups(variable); 855 856 // Perform the loop body, setting up break and continue labels. 857 BreakContinueStack.push_back(BreakContinue(LoopEnd, AfterBody)); 858 { 859 RunCleanupsScope Scope(*this); 860 EmitStmt(S.getBody()); 861 } 862 BreakContinueStack.pop_back(); 863 864 // Destroy the element variable now. 865 elementVariableScope.ForceCleanup(); 866 867 // Check whether there are more elements. 868 EmitBlock(AfterBody.getBlock()); 869 870 llvm::BasicBlock *FetchMoreBB = createBasicBlock("forcoll.refetch"); 871 872 // First we check in the local buffer. 873 llvm::Value *indexPlusOne 874 = Builder.CreateAdd(index, llvm::ConstantInt::get(UnsignedLongLTy, 1)); 875 876 // If we haven't overrun the buffer yet, we can continue. 877 Builder.CreateCondBr(Builder.CreateICmpULT(indexPlusOne, count), 878 LoopBodyBB, FetchMoreBB); 879 880 index->addIncoming(indexPlusOne, AfterBody.getBlock()); 881 count->addIncoming(count, AfterBody.getBlock()); 882 883 // Otherwise, we have to fetch more elements. 884 EmitBlock(FetchMoreBB); 885 886 CountRV = 887 CGM.getObjCRuntime().GenerateMessageSend(*this, ReturnValueSlot(), 888 getContext().UnsignedLongTy, 889 FastEnumSel, 890 Collection, Args); 891 892 // If we got a zero count, we're done. 893 llvm::Value *refetchCount = CountRV.getScalarVal(); 894 895 // (note that the message send might split FetchMoreBB) 896 index->addIncoming(zero, Builder.GetInsertBlock()); 897 count->addIncoming(refetchCount, Builder.GetInsertBlock()); 898 899 Builder.CreateCondBr(Builder.CreateICmpEQ(refetchCount, zero), 900 EmptyBB, LoopBodyBB); 901 902 // No more elements. 903 EmitBlock(EmptyBB); 904 905 if (!elementIsVariable) { 906 // If the element was not a declaration, set it to be null. 907 908 llvm::Value *null = llvm::Constant::getNullValue(convertedElementType); 909 elementLValue = EmitLValue(cast<Expr>(S.getElement())); 910 EmitStoreThroughLValue(RValue::get(null), elementLValue, elementType); 911 } 912 913 if (DI) { 914 DI->setLocation(S.getSourceRange().getEnd()); 915 DI->EmitRegionEnd(Builder); 916 } 917 918 EmitBlock(LoopEnd.getBlock()); 919} 920 921void CodeGenFunction::EmitObjCAtTryStmt(const ObjCAtTryStmt &S) { 922 CGM.getObjCRuntime().EmitTryStmt(*this, S); 923} 924 925void CodeGenFunction::EmitObjCAtThrowStmt(const ObjCAtThrowStmt &S) { 926 CGM.getObjCRuntime().EmitThrowStmt(*this, S); 927} 928 929void CodeGenFunction::EmitObjCAtSynchronizedStmt( 930 const ObjCAtSynchronizedStmt &S) { 931 CGM.getObjCRuntime().EmitSynchronizedStmt(*this, S); 932} 933 934CGObjCRuntime::~CGObjCRuntime() {} 935