clang  8.0.0svn
CGObjC.cpp
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1 //===---- CGObjC.cpp - Emit LLVM Code for Objective-C ---------------------===//
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 "TargetInfo.h"
19 #include "clang/AST/ASTContext.h"
20 #include "clang/AST/DeclObjC.h"
21 #include "clang/AST/StmtObjC.h"
22 #include "clang/Basic/Diagnostic.h"
24 #include "llvm/ADT/STLExtras.h"
25 #include "llvm/IR/CallSite.h"
26 #include "llvm/IR/DataLayout.h"
27 #include "llvm/IR/InlineAsm.h"
28 using namespace clang;
29 using namespace CodeGen;
30 
31 typedef llvm::PointerIntPair<llvm::Value*,1,bool> TryEmitResult;
32 static TryEmitResult
35  QualType ET,
36  RValue Result);
37 
38 /// Given the address of a variable of pointer type, find the correct
39 /// null to store into it.
40 static llvm::Constant *getNullForVariable(Address addr) {
41  llvm::Type *type = addr.getElementType();
42  return llvm::ConstantPointerNull::get(cast<llvm::PointerType>(type));
43 }
44 
45 /// Emits an instance of NSConstantString representing the object.
47 {
48  llvm::Constant *C =
50  // FIXME: This bitcast should just be made an invariant on the Runtime.
51  return llvm::ConstantExpr::getBitCast(C, ConvertType(E->getType()));
52 }
53 
54 /// EmitObjCBoxedExpr - This routine generates code to call
55 /// the appropriate expression boxing method. This will either be
56 /// one of +[NSNumber numberWith<Type>:], or +[NSString stringWithUTF8String:],
57 /// or [NSValue valueWithBytes:objCType:].
58 ///
61  // Generate the correct selector for this literal's concrete type.
62  // Get the method.
63  const ObjCMethodDecl *BoxingMethod = E->getBoxingMethod();
64  const Expr *SubExpr = E->getSubExpr();
65  assert(BoxingMethod && "BoxingMethod is null");
66  assert(BoxingMethod->isClassMethod() && "BoxingMethod must be a class method");
67  Selector Sel = BoxingMethod->getSelector();
68 
69  // Generate a reference to the class pointer, which will be the receiver.
70  // Assumes that the method was introduced in the class that should be
71  // messaged (avoids pulling it out of the result type).
72  CGObjCRuntime &Runtime = CGM.getObjCRuntime();
73  const ObjCInterfaceDecl *ClassDecl = BoxingMethod->getClassInterface();
74  llvm::Value *Receiver = Runtime.GetClass(*this, ClassDecl);
75 
76  CallArgList Args;
77  const ParmVarDecl *ArgDecl = *BoxingMethod->param_begin();
78  QualType ArgQT = ArgDecl->getType().getUnqualifiedType();
79 
80  // ObjCBoxedExpr supports boxing of structs and unions
81  // via [NSValue valueWithBytes:objCType:]
82  const QualType ValueType(SubExpr->getType().getCanonicalType());
83  if (ValueType->isObjCBoxableRecordType()) {
84  // Emit CodeGen for first parameter
85  // and cast value to correct type
86  Address Temporary = CreateMemTemp(SubExpr->getType());
87  EmitAnyExprToMem(SubExpr, Temporary, Qualifiers(), /*isInit*/ true);
88  Address BitCast = Builder.CreateBitCast(Temporary, ConvertType(ArgQT));
89  Args.add(RValue::get(BitCast.getPointer()), ArgQT);
90 
91  // Create char array to store type encoding
92  std::string Str;
93  getContext().getObjCEncodingForType(ValueType, Str);
94  llvm::Constant *GV = CGM.GetAddrOfConstantCString(Str).getPointer();
95 
96  // Cast type encoding to correct type
97  const ParmVarDecl *EncodingDecl = BoxingMethod->parameters()[1];
98  QualType EncodingQT = EncodingDecl->getType().getUnqualifiedType();
99  llvm::Value *Cast = Builder.CreateBitCast(GV, ConvertType(EncodingQT));
100 
101  Args.add(RValue::get(Cast), EncodingQT);
102  } else {
103  Args.add(EmitAnyExpr(SubExpr), ArgQT);
104  }
105 
106  RValue result = Runtime.GenerateMessageSend(
107  *this, ReturnValueSlot(), BoxingMethod->getReturnType(), Sel, Receiver,
108  Args, ClassDecl, BoxingMethod);
109  return Builder.CreateBitCast(result.getScalarVal(),
110  ConvertType(E->getType()));
111 }
112 
114  const ObjCMethodDecl *MethodWithObjects) {
115  ASTContext &Context = CGM.getContext();
116  const ObjCDictionaryLiteral *DLE = nullptr;
117  const ObjCArrayLiteral *ALE = dyn_cast<ObjCArrayLiteral>(E);
118  if (!ALE)
119  DLE = cast<ObjCDictionaryLiteral>(E);
120 
121  // Optimize empty collections by referencing constants, when available.
122  uint64_t NumElements =
123  ALE ? ALE->getNumElements() : DLE->getNumElements();
124  if (NumElements == 0 && CGM.getLangOpts().ObjCRuntime.hasEmptyCollections()) {
125  StringRef ConstantName = ALE ? "__NSArray0__" : "__NSDictionary0__";
127  llvm::Constant *Constant =
128  CGM.CreateRuntimeVariable(ConvertType(IdTy), ConstantName);
129  LValue LV = MakeNaturalAlignAddrLValue(Constant, IdTy);
130  llvm::Value *Ptr = EmitLoadOfScalar(LV, E->getBeginLoc());
131  cast<llvm::LoadInst>(Ptr)->setMetadata(
132  CGM.getModule().getMDKindID("invariant.load"),
133  llvm::MDNode::get(getLLVMContext(), None));
134  return Builder.CreateBitCast(Ptr, ConvertType(E->getType()));
135  }
136 
137  // Compute the type of the array we're initializing.
138  llvm::APInt APNumElements(Context.getTypeSize(Context.getSizeType()),
139  NumElements);
140  QualType ElementType = Context.getObjCIdType().withConst();
141  QualType ElementArrayType
142  = Context.getConstantArrayType(ElementType, APNumElements,
143  ArrayType::Normal, /*IndexTypeQuals=*/0);
144 
145  // Allocate the temporary array(s).
146  Address Objects = CreateMemTemp(ElementArrayType, "objects");
147  Address Keys = Address::invalid();
148  if (DLE)
149  Keys = CreateMemTemp(ElementArrayType, "keys");
150 
151  // In ARC, we may need to do extra work to keep all the keys and
152  // values alive until after the call.
153  SmallVector<llvm::Value *, 16> NeededObjects;
154  bool TrackNeededObjects =
155  (getLangOpts().ObjCAutoRefCount &&
156  CGM.getCodeGenOpts().OptimizationLevel != 0);
157 
158  // Perform the actual initialialization of the array(s).
159  for (uint64_t i = 0; i < NumElements; i++) {
160  if (ALE) {
161  // Emit the element and store it to the appropriate array slot.
162  const Expr *Rhs = ALE->getElement(i);
163  LValue LV = MakeAddrLValue(
165  ElementType, AlignmentSource::Decl);
166 
167  llvm::Value *value = EmitScalarExpr(Rhs);
168  EmitStoreThroughLValue(RValue::get(value), LV, true);
169  if (TrackNeededObjects) {
170  NeededObjects.push_back(value);
171  }
172  } else {
173  // Emit the key and store it to the appropriate array slot.
174  const Expr *Key = DLE->getKeyValueElement(i).Key;
175  LValue KeyLV = MakeAddrLValue(
177  ElementType, AlignmentSource::Decl);
178  llvm::Value *keyValue = EmitScalarExpr(Key);
179  EmitStoreThroughLValue(RValue::get(keyValue), KeyLV, /*isInit=*/true);
180 
181  // Emit the value and store it to the appropriate array slot.
182  const Expr *Value = DLE->getKeyValueElement(i).Value;
183  LValue ValueLV = MakeAddrLValue(
185  ElementType, AlignmentSource::Decl);
186  llvm::Value *valueValue = EmitScalarExpr(Value);
187  EmitStoreThroughLValue(RValue::get(valueValue), ValueLV, /*isInit=*/true);
188  if (TrackNeededObjects) {
189  NeededObjects.push_back(keyValue);
190  NeededObjects.push_back(valueValue);
191  }
192  }
193  }
194 
195  // Generate the argument list.
196  CallArgList Args;
197  ObjCMethodDecl::param_const_iterator PI = MethodWithObjects->param_begin();
198  const ParmVarDecl *argDecl = *PI++;
199  QualType ArgQT = argDecl->getType().getUnqualifiedType();
200  Args.add(RValue::get(Objects.getPointer()), ArgQT);
201  if (DLE) {
202  argDecl = *PI++;
203  ArgQT = argDecl->getType().getUnqualifiedType();
204  Args.add(RValue::get(Keys.getPointer()), ArgQT);
205  }
206  argDecl = *PI;
207  ArgQT = argDecl->getType().getUnqualifiedType();
208  llvm::Value *Count =
209  llvm::ConstantInt::get(CGM.getTypes().ConvertType(ArgQT), NumElements);
210  Args.add(RValue::get(Count), ArgQT);
211 
212  // Generate a reference to the class pointer, which will be the receiver.
213  Selector Sel = MethodWithObjects->getSelector();
214  QualType ResultType = E->getType();
215  const ObjCObjectPointerType *InterfacePointerType
216  = ResultType->getAsObjCInterfacePointerType();
217  ObjCInterfaceDecl *Class
218  = InterfacePointerType->getObjectType()->getInterface();
219  CGObjCRuntime &Runtime = CGM.getObjCRuntime();
220  llvm::Value *Receiver = Runtime.GetClass(*this, Class);
221 
222  // Generate the message send.
223  RValue result = Runtime.GenerateMessageSend(
224  *this, ReturnValueSlot(), MethodWithObjects->getReturnType(), Sel,
225  Receiver, Args, Class, MethodWithObjects);
226 
227  // The above message send needs these objects, but in ARC they are
228  // passed in a buffer that is essentially __unsafe_unretained.
229  // Therefore we must prevent the optimizer from releasing them until
230  // after the call.
231  if (TrackNeededObjects) {
232  EmitARCIntrinsicUse(NeededObjects);
233  }
234 
235  return Builder.CreateBitCast(result.getScalarVal(),
236  ConvertType(E->getType()));
237 }
238 
241 }
242 
244  const ObjCDictionaryLiteral *E) {
246 }
247 
248 /// Emit a selector.
250  // Untyped selector.
251  // Note that this implementation allows for non-constant strings to be passed
252  // as arguments to @selector(). Currently, the only thing preventing this
253  // behaviour is the type checking in the front end.
254  return CGM.getObjCRuntime().GetSelector(*this, E->getSelector());
255 }
256 
258  // FIXME: This should pass the Decl not the name.
259  return CGM.getObjCRuntime().GenerateProtocolRef(*this, E->getProtocol());
260 }
261 
262 /// Adjust the type of an Objective-C object that doesn't match up due
263 /// to type erasure at various points, e.g., related result types or the use
264 /// of parameterized classes.
266  RValue Result) {
267  if (!ExpT->isObjCRetainableType())
268  return Result;
269 
270  // If the converted types are the same, we're done.
271  llvm::Type *ExpLLVMTy = CGF.ConvertType(ExpT);
272  if (ExpLLVMTy == Result.getScalarVal()->getType())
273  return Result;
274 
275  // We have applied a substitution. Cast the rvalue appropriately.
276  return RValue::get(CGF.Builder.CreateBitCast(Result.getScalarVal(),
277  ExpLLVMTy));
278 }
279 
280 /// Decide whether to extend the lifetime of the receiver of a
281 /// returns-inner-pointer message.
282 static bool
284  switch (message->getReceiverKind()) {
285 
286  // For a normal instance message, we should extend unless the
287  // receiver is loaded from a variable with precise lifetime.
289  const Expr *receiver = message->getInstanceReceiver();
290 
291  // Look through OVEs.
292  if (auto opaque = dyn_cast<OpaqueValueExpr>(receiver)) {
293  if (opaque->getSourceExpr())
294  receiver = opaque->getSourceExpr()->IgnoreParens();
295  }
296 
297  const ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(receiver);
298  if (!ice || ice->getCastKind() != CK_LValueToRValue) return true;
299  receiver = ice->getSubExpr()->IgnoreParens();
300 
301  // Look through OVEs.
302  if (auto opaque = dyn_cast<OpaqueValueExpr>(receiver)) {
303  if (opaque->getSourceExpr())
304  receiver = opaque->getSourceExpr()->IgnoreParens();
305  }
306 
307  // Only __strong variables.
308  if (receiver->getType().getObjCLifetime() != Qualifiers::OCL_Strong)
309  return true;
310 
311  // All ivars and fields have precise lifetime.
312  if (isa<MemberExpr>(receiver) || isa<ObjCIvarRefExpr>(receiver))
313  return false;
314 
315  // Otherwise, check for variables.
316  const DeclRefExpr *declRef = dyn_cast<DeclRefExpr>(ice->getSubExpr());
317  if (!declRef) return true;
318  const VarDecl *var = dyn_cast<VarDecl>(declRef->getDecl());
319  if (!var) return true;
320 
321  // All variables have precise lifetime except local variables with
322  // automatic storage duration that aren't specially marked.
323  return (var->hasLocalStorage() &&
324  !var->hasAttr<ObjCPreciseLifetimeAttr>());
325  }
326 
329  // It's never necessary for class objects.
330  return false;
331 
333  // We generally assume that 'self' lives throughout a method call.
334  return false;
335  }
336 
337  llvm_unreachable("invalid receiver kind");
338 }
339 
340 /// Given an expression of ObjC pointer type, check whether it was
341 /// immediately loaded from an ARC __weak l-value.
342 static const Expr *findWeakLValue(const Expr *E) {
343  assert(E->getType()->isObjCRetainableType());
344  E = E->IgnoreParens();
345  if (auto CE = dyn_cast<CastExpr>(E)) {
346  if (CE->getCastKind() == CK_LValueToRValue) {
347  if (CE->getSubExpr()->getType().getObjCLifetime() == Qualifiers::OCL_Weak)
348  return CE->getSubExpr();
349  }
350  }
351 
352  return nullptr;
353 }
354 
356  ReturnValueSlot Return) {
357  // Only the lookup mechanism and first two arguments of the method
358  // implementation vary between runtimes. We can get the receiver and
359  // arguments in generic code.
360 
361  bool isDelegateInit = E->isDelegateInitCall();
362 
363  const ObjCMethodDecl *method = E->getMethodDecl();
364 
365  // If the method is -retain, and the receiver's being loaded from
366  // a __weak variable, peephole the entire operation to objc_loadWeakRetained.
367  if (method && E->getReceiverKind() == ObjCMessageExpr::Instance &&
368  method->getMethodFamily() == OMF_retain) {
369  if (auto lvalueExpr = findWeakLValue(E->getInstanceReceiver())) {
370  LValue lvalue = EmitLValue(lvalueExpr);
371  llvm::Value *result = EmitARCLoadWeakRetained(lvalue.getAddress());
372  return AdjustObjCObjectType(*this, E->getType(), RValue::get(result));
373  }
374  }
375 
376  // We don't retain the receiver in delegate init calls, and this is
377  // safe because the receiver value is always loaded from 'self',
378  // which we zero out. We don't want to Block_copy block receivers,
379  // though.
380  bool retainSelf =
381  (!isDelegateInit &&
382  CGM.getLangOpts().ObjCAutoRefCount &&
383  method &&
384  method->hasAttr<NSConsumesSelfAttr>());
385 
386  CGObjCRuntime &Runtime = CGM.getObjCRuntime();
387  bool isSuperMessage = false;
388  bool isClassMessage = false;
389  ObjCInterfaceDecl *OID = nullptr;
390  // Find the receiver
391  QualType ReceiverType;
392  llvm::Value *Receiver = nullptr;
393  switch (E->getReceiverKind()) {
395  ReceiverType = E->getInstanceReceiver()->getType();
396  if (retainSelf) {
398  E->getInstanceReceiver());
399  Receiver = ter.getPointer();
400  if (ter.getInt()) retainSelf = false;
401  } else
402  Receiver = EmitScalarExpr(E->getInstanceReceiver());
403  break;
404 
405  case ObjCMessageExpr::Class: {
406  ReceiverType = E->getClassReceiver();
407  const ObjCObjectType *ObjTy = ReceiverType->getAs<ObjCObjectType>();
408  assert(ObjTy && "Invalid Objective-C class message send");
409  OID = ObjTy->getInterface();
410  assert(OID && "Invalid Objective-C class message send");
411  Receiver = Runtime.GetClass(*this, OID);
412  isClassMessage = true;
413  break;
414  }
415 
417  ReceiverType = E->getSuperType();
418  Receiver = LoadObjCSelf();
419  isSuperMessage = true;
420  break;
421 
423  ReceiverType = E->getSuperType();
424  Receiver = LoadObjCSelf();
425  isSuperMessage = true;
426  isClassMessage = true;
427  break;
428  }
429 
430  if (retainSelf)
431  Receiver = EmitARCRetainNonBlock(Receiver);
432 
433  // In ARC, we sometimes want to "extend the lifetime"
434  // (i.e. retain+autorelease) of receivers of returns-inner-pointer
435  // messages.
436  if (getLangOpts().ObjCAutoRefCount && method &&
437  method->hasAttr<ObjCReturnsInnerPointerAttr>() &&
439  Receiver = EmitARCRetainAutorelease(ReceiverType, Receiver);
440 
441  QualType ResultType = method ? method->getReturnType() : E->getType();
442 
443  CallArgList Args;
444  EmitCallArgs(Args, method, E->arguments(), /*AC*/AbstractCallee(method));
445 
446  // For delegate init calls in ARC, do an unsafe store of null into
447  // self. This represents the call taking direct ownership of that
448  // value. We have to do this after emitting the other call
449  // arguments because they might also reference self, but we don't
450  // have to worry about any of them modifying self because that would
451  // be an undefined read and write of an object in unordered
452  // expressions.
453  if (isDelegateInit) {
454  assert(getLangOpts().ObjCAutoRefCount &&
455  "delegate init calls should only be marked in ARC");
456 
457  // Do an unsafe store of null into self.
458  Address selfAddr =
459  GetAddrOfLocalVar(cast<ObjCMethodDecl>(CurCodeDecl)->getSelfDecl());
460  Builder.CreateStore(getNullForVariable(selfAddr), selfAddr);
461  }
462 
463  RValue result;
464  if (isSuperMessage) {
465  // super is only valid in an Objective-C method
466  const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CurFuncDecl);
467  bool isCategoryImpl = isa<ObjCCategoryImplDecl>(OMD->getDeclContext());
468  result = Runtime.GenerateMessageSendSuper(*this, Return, ResultType,
469  E->getSelector(),
470  OMD->getClassInterface(),
471  isCategoryImpl,
472  Receiver,
473  isClassMessage,
474  Args,
475  method);
476  } else {
477  result = Runtime.GenerateMessageSend(*this, Return, ResultType,
478  E->getSelector(),
479  Receiver, Args, OID,
480  method);
481  }
482 
483  // For delegate init calls in ARC, implicitly store the result of
484  // the call back into self. This takes ownership of the value.
485  if (isDelegateInit) {
486  Address selfAddr =
487  GetAddrOfLocalVar(cast<ObjCMethodDecl>(CurCodeDecl)->getSelfDecl());
488  llvm::Value *newSelf = result.getScalarVal();
489 
490  // The delegate return type isn't necessarily a matching type; in
491  // fact, it's quite likely to be 'id'.
492  llvm::Type *selfTy = selfAddr.getElementType();
493  newSelf = Builder.CreateBitCast(newSelf, selfTy);
494 
495  Builder.CreateStore(newSelf, selfAddr);
496  }
497 
498  return AdjustObjCObjectType(*this, E->getType(), result);
499 }
500 
501 namespace {
502 struct FinishARCDealloc final : EHScopeStack::Cleanup {
503  void Emit(CodeGenFunction &CGF, Flags flags) override {
504  const ObjCMethodDecl *method = cast<ObjCMethodDecl>(CGF.CurCodeDecl);
505 
506  const ObjCImplDecl *impl = cast<ObjCImplDecl>(method->getDeclContext());
507  const ObjCInterfaceDecl *iface = impl->getClassInterface();
508  if (!iface->getSuperClass()) return;
509 
510  bool isCategory = isa<ObjCCategoryImplDecl>(impl);
511 
512  // Call [super dealloc] if we have a superclass.
513  llvm::Value *self = CGF.LoadObjCSelf();
514 
515  CallArgList args;
517  CGF.getContext().VoidTy,
518  method->getSelector(),
519  iface,
520  isCategory,
521  self,
522  /*is class msg*/ false,
523  args,
524  method);
525  }
526 };
527 }
528 
529 /// StartObjCMethod - Begin emission of an ObjCMethod. This generates
530 /// the LLVM function and sets the other context used by
531 /// CodeGenFunction.
533  const ObjCContainerDecl *CD) {
534  SourceLocation StartLoc = OMD->getBeginLoc();
535  FunctionArgList args;
536  // Check if we should generate debug info for this method.
537  if (OMD->hasAttr<NoDebugAttr>())
538  DebugInfo = nullptr; // disable debug info indefinitely for this function
539 
540  llvm::Function *Fn = CGM.getObjCRuntime().GenerateMethod(OMD, CD);
541 
543  CGM.SetInternalFunctionAttributes(OMD, Fn, FI);
544 
545  args.push_back(OMD->getSelfDecl());
546  args.push_back(OMD->getCmdDecl());
547 
548  args.append(OMD->param_begin(), OMD->param_end());
549 
550  CurGD = OMD;
551  CurEHLocation = OMD->getEndLoc();
552 
553  StartFunction(OMD, OMD->getReturnType(), Fn, FI, args,
554  OMD->getLocation(), StartLoc);
555 
556  // In ARC, certain methods get an extra cleanup.
557  if (CGM.getLangOpts().ObjCAutoRefCount &&
558  OMD->isInstanceMethod() &&
559  OMD->getSelector().isUnarySelector()) {
560  const IdentifierInfo *ident =
562  if (ident->isStr("dealloc"))
563  EHStack.pushCleanup<FinishARCDealloc>(getARCCleanupKind());
564  }
565 }
566 
568  LValue lvalue, QualType type);
569 
570 /// Generate an Objective-C method. An Objective-C method is a C function with
571 /// its pointer, name, and types registered in the class struture.
573  StartObjCMethod(OMD, OMD->getClassInterface());
574  PGO.assignRegionCounters(GlobalDecl(OMD), CurFn);
575  assert(isa<CompoundStmt>(OMD->getBody()));
577  EmitCompoundStmtWithoutScope(*cast<CompoundStmt>(OMD->getBody()));
579 }
580 
581 /// emitStructGetterCall - Call the runtime function to load a property
582 /// into the return value slot.
584  bool isAtomic, bool hasStrong) {
585  ASTContext &Context = CGF.getContext();
586 
587  Address src =
588  CGF.EmitLValueForIvar(CGF.TypeOfSelfObject(), CGF.LoadObjCSelf(), ivar, 0)
589  .getAddress();
590 
591  // objc_copyStruct (ReturnValue, &structIvar,
592  // sizeof (Type of Ivar), isAtomic, false);
593  CallArgList args;
594 
595  Address dest = CGF.Builder.CreateBitCast(CGF.ReturnValue, CGF.VoidPtrTy);
596  args.add(RValue::get(dest.getPointer()), Context.VoidPtrTy);
597 
598  src = CGF.Builder.CreateBitCast(src, CGF.VoidPtrTy);
599  args.add(RValue::get(src.getPointer()), Context.VoidPtrTy);
600 
601  CharUnits size = CGF.getContext().getTypeSizeInChars(ivar->getType());
602  args.add(RValue::get(CGF.CGM.getSize(size)), Context.getSizeType());
603  args.add(RValue::get(CGF.Builder.getInt1(isAtomic)), Context.BoolTy);
604  args.add(RValue::get(CGF.Builder.getInt1(hasStrong)), Context.BoolTy);
605 
606  llvm::Constant *fn = CGF.CGM.getObjCRuntime().GetGetStructFunction();
607  CGCallee callee = CGCallee::forDirect(fn);
608  CGF.EmitCall(CGF.getTypes().arrangeBuiltinFunctionCall(Context.VoidTy, args),
609  callee, ReturnValueSlot(), args);
610 }
611 
612 /// Determine whether the given architecture supports unaligned atomic
613 /// accesses. They don't have to be fast, just faster than a function
614 /// call and a mutex.
615 static bool hasUnalignedAtomics(llvm::Triple::ArchType arch) {
616  // FIXME: Allow unaligned atomic load/store on x86. (It is not
617  // currently supported by the backend.)
618  return 0;
619 }
620 
621 /// Return the maximum size that permits atomic accesses for the given
622 /// architecture.
624  llvm::Triple::ArchType arch) {
625  // ARM has 8-byte atomic accesses, but it's not clear whether we
626  // want to rely on them here.
627 
628  // In the default case, just assume that any size up to a pointer is
629  // fine given adequate alignment.
631 }
632 
633 namespace {
634  class PropertyImplStrategy {
635  public:
636  enum StrategyKind {
637  /// The 'native' strategy is to use the architecture's provided
638  /// reads and writes.
639  Native,
640 
641  /// Use objc_setProperty and objc_getProperty.
642  GetSetProperty,
643 
644  /// Use objc_setProperty for the setter, but use expression
645  /// evaluation for the getter.
646  SetPropertyAndExpressionGet,
647 
648  /// Use objc_copyStruct.
649  CopyStruct,
650 
651  /// The 'expression' strategy is to emit normal assignment or
652  /// lvalue-to-rvalue expressions.
653  Expression
654  };
655 
656  StrategyKind getKind() const { return StrategyKind(Kind); }
657 
658  bool hasStrongMember() const { return HasStrong; }
659  bool isAtomic() const { return IsAtomic; }
660  bool isCopy() const { return IsCopy; }
661 
662  CharUnits getIvarSize() const { return IvarSize; }
663  CharUnits getIvarAlignment() const { return IvarAlignment; }
664 
665  PropertyImplStrategy(CodeGenModule &CGM,
666  const ObjCPropertyImplDecl *propImpl);
667 
668  private:
669  unsigned Kind : 8;
670  unsigned IsAtomic : 1;
671  unsigned IsCopy : 1;
672  unsigned HasStrong : 1;
673 
674  CharUnits IvarSize;
675  CharUnits IvarAlignment;
676  };
677 }
678 
679 /// Pick an implementation strategy for the given property synthesis.
680 PropertyImplStrategy::PropertyImplStrategy(CodeGenModule &CGM,
681  const ObjCPropertyImplDecl *propImpl) {
682  const ObjCPropertyDecl *prop = propImpl->getPropertyDecl();
683  ObjCPropertyDecl::SetterKind setterKind = prop->getSetterKind();
684 
685  IsCopy = (setterKind == ObjCPropertyDecl::Copy);
686  IsAtomic = prop->isAtomic();
687  HasStrong = false; // doesn't matter here.
688 
689  // Evaluate the ivar's size and alignment.
690  ObjCIvarDecl *ivar = propImpl->getPropertyIvarDecl();
691  QualType ivarType = ivar->getType();
692  std::tie(IvarSize, IvarAlignment) =
693  CGM.getContext().getTypeInfoInChars(ivarType);
694 
695  // If we have a copy property, we always have to use getProperty/setProperty.
696  // TODO: we could actually use setProperty and an expression for non-atomics.
697  if (IsCopy) {
698  Kind = GetSetProperty;
699  return;
700  }
701 
702  // Handle retain.
703  if (setterKind == ObjCPropertyDecl::Retain) {
704  // In GC-only, there's nothing special that needs to be done.
705  if (CGM.getLangOpts().getGC() == LangOptions::GCOnly) {
706  // fallthrough
707 
708  // In ARC, if the property is non-atomic, use expression emission,
709  // which translates to objc_storeStrong. This isn't required, but
710  // it's slightly nicer.
711  } else if (CGM.getLangOpts().ObjCAutoRefCount && !IsAtomic) {
712  // Using standard expression emission for the setter is only
713  // acceptable if the ivar is __strong, which won't be true if
714  // the property is annotated with __attribute__((NSObject)).
715  // TODO: falling all the way back to objc_setProperty here is
716  // just laziness, though; we could still use objc_storeStrong
717  // if we hacked it right.
718  if (ivarType.getObjCLifetime() == Qualifiers::OCL_Strong)
719  Kind = Expression;
720  else
721  Kind = SetPropertyAndExpressionGet;
722  return;
723 
724  // Otherwise, we need to at least use setProperty. However, if
725  // the property isn't atomic, we can use normal expression
726  // emission for the getter.
727  } else if (!IsAtomic) {
728  Kind = SetPropertyAndExpressionGet;
729  return;
730 
731  // Otherwise, we have to use both setProperty and getProperty.
732  } else {
733  Kind = GetSetProperty;
734  return;
735  }
736  }
737 
738  // If we're not atomic, just use expression accesses.
739  if (!IsAtomic) {
740  Kind = Expression;
741  return;
742  }
743 
744  // Properties on bitfield ivars need to be emitted using expression
745  // accesses even if they're nominally atomic.
746  if (ivar->isBitField()) {
747  Kind = Expression;
748  return;
749  }
750 
751  // GC-qualified or ARC-qualified ivars need to be emitted as
752  // expressions. This actually works out to being atomic anyway,
753  // except for ARC __strong, but that should trigger the above code.
754  if (ivarType.hasNonTrivialObjCLifetime() ||
755  (CGM.getLangOpts().getGC() &&
756  CGM.getContext().getObjCGCAttrKind(ivarType))) {
757  Kind = Expression;
758  return;
759  }
760 
761  // Compute whether the ivar has strong members.
762  if (CGM.getLangOpts().getGC())
763  if (const RecordType *recordType = ivarType->getAs<RecordType>())
764  HasStrong = recordType->getDecl()->hasObjectMember();
765 
766  // We can never access structs with object members with a native
767  // access, because we need to use write barriers. This is what
768  // objc_copyStruct is for.
769  if (HasStrong) {
770  Kind = CopyStruct;
771  return;
772  }
773 
774  // Otherwise, this is target-dependent and based on the size and
775  // alignment of the ivar.
776 
777  // If the size of the ivar is not a power of two, give up. We don't
778  // want to get into the business of doing compare-and-swaps.
779  if (!IvarSize.isPowerOfTwo()) {
780  Kind = CopyStruct;
781  return;
782  }
783 
784  llvm::Triple::ArchType arch =
785  CGM.getTarget().getTriple().getArch();
786 
787  // Most architectures require memory to fit within a single cache
788  // line, so the alignment has to be at least the size of the access.
789  // Otherwise we have to grab a lock.
790  if (IvarAlignment < IvarSize && !hasUnalignedAtomics(arch)) {
791  Kind = CopyStruct;
792  return;
793  }
794 
795  // If the ivar's size exceeds the architecture's maximum atomic
796  // access size, we have to use CopyStruct.
797  if (IvarSize > getMaxAtomicAccessSize(CGM, arch)) {
798  Kind = CopyStruct;
799  return;
800  }
801 
802  // Otherwise, we can use native loads and stores.
803  Kind = Native;
804 }
805 
806 /// Generate an Objective-C property getter function.
807 ///
808 /// The given Decl must be an ObjCImplementationDecl. \@synthesize
809 /// is illegal within a category.
811  const ObjCPropertyImplDecl *PID) {
812  llvm::Constant *AtomicHelperFn =
814  const ObjCPropertyDecl *PD = PID->getPropertyDecl();
815  ObjCMethodDecl *OMD = PD->getGetterMethodDecl();
816  assert(OMD && "Invalid call to generate getter (empty method)");
817  StartObjCMethod(OMD, IMP->getClassInterface());
818 
819  generateObjCGetterBody(IMP, PID, OMD, AtomicHelperFn);
820 
821  FinishFunction();
822 }
823 
824 static bool hasTrivialGetExpr(const ObjCPropertyImplDecl *propImpl) {
825  const Expr *getter = propImpl->getGetterCXXConstructor();
826  if (!getter) return true;
827 
828  // Sema only makes only of these when the ivar has a C++ class type,
829  // so the form is pretty constrained.
830 
831  // If the property has a reference type, we might just be binding a
832  // reference, in which case the result will be a gl-value. We should
833  // treat this as a non-trivial operation.
834  if (getter->isGLValue())
835  return false;
836 
837  // If we selected a trivial copy-constructor, we're okay.
838  if (const CXXConstructExpr *construct = dyn_cast<CXXConstructExpr>(getter))
839  return (construct->getConstructor()->isTrivial());
840 
841  // The constructor might require cleanups (in which case it's never
842  // trivial).
843  assert(isa<ExprWithCleanups>(getter));
844  return false;
845 }
846 
847 /// emitCPPObjectAtomicGetterCall - Call the runtime function to
848 /// copy the ivar into the resturn slot.
850  llvm::Value *returnAddr,
851  ObjCIvarDecl *ivar,
852  llvm::Constant *AtomicHelperFn) {
853  // objc_copyCppObjectAtomic (&returnSlot, &CppObjectIvar,
854  // AtomicHelperFn);
855  CallArgList args;
856 
857  // The 1st argument is the return Slot.
858  args.add(RValue::get(returnAddr), CGF.getContext().VoidPtrTy);
859 
860  // The 2nd argument is the address of the ivar.
861  llvm::Value *ivarAddr =
863  CGF.LoadObjCSelf(), ivar, 0).getPointer();
864  ivarAddr = CGF.Builder.CreateBitCast(ivarAddr, CGF.Int8PtrTy);
865  args.add(RValue::get(ivarAddr), CGF.getContext().VoidPtrTy);
866 
867  // Third argument is the helper function.
868  args.add(RValue::get(AtomicHelperFn), CGF.getContext().VoidPtrTy);
869 
870  llvm::Constant *copyCppAtomicObjectFn =
872  CGCallee callee = CGCallee::forDirect(copyCppAtomicObjectFn);
873  CGF.EmitCall(
875  callee, ReturnValueSlot(), args);
876 }
877 
878 void
880  const ObjCPropertyImplDecl *propImpl,
881  const ObjCMethodDecl *GetterMethodDecl,
882  llvm::Constant *AtomicHelperFn) {
883  // If there's a non-trivial 'get' expression, we just have to emit that.
884  if (!hasTrivialGetExpr(propImpl)) {
885  if (!AtomicHelperFn) {
887  propImpl->getGetterCXXConstructor(),
888  /* NRVOCandidate=*/nullptr);
889  EmitReturnStmt(*ret);
890  }
891  else {
892  ObjCIvarDecl *ivar = propImpl->getPropertyIvarDecl();
894  ivar, AtomicHelperFn);
895  }
896  return;
897  }
898 
899  const ObjCPropertyDecl *prop = propImpl->getPropertyDecl();
900  QualType propType = prop->getType();
901  ObjCMethodDecl *getterMethod = prop->getGetterMethodDecl();
902 
903  ObjCIvarDecl *ivar = propImpl->getPropertyIvarDecl();
904 
905  // Pick an implementation strategy.
906  PropertyImplStrategy strategy(CGM, propImpl);
907  switch (strategy.getKind()) {
908  case PropertyImplStrategy::Native: {
909  // We don't need to do anything for a zero-size struct.
910  if (strategy.getIvarSize().isZero())
911  return;
912 
914 
915  // Currently, all atomic accesses have to be through integer
916  // types, so there's no point in trying to pick a prettier type.
917  uint64_t ivarSize = getContext().toBits(strategy.getIvarSize());
918  llvm::Type *bitcastType = llvm::Type::getIntNTy(getLLVMContext(), ivarSize);
919  bitcastType = bitcastType->getPointerTo(); // addrspace 0 okay
920 
921  // Perform an atomic load. This does not impose ordering constraints.
922  Address ivarAddr = LV.getAddress();
923  ivarAddr = Builder.CreateBitCast(ivarAddr, bitcastType);
924  llvm::LoadInst *load = Builder.CreateLoad(ivarAddr, "load");
925  load->setAtomic(llvm::AtomicOrdering::Unordered);
926 
927  // Store that value into the return address. Doing this with a
928  // bitcast is likely to produce some pretty ugly IR, but it's not
929  // the *most* terrible thing in the world.
930  llvm::Type *retTy = ConvertType(getterMethod->getReturnType());
931  uint64_t retTySize = CGM.getDataLayout().getTypeSizeInBits(retTy);
932  llvm::Value *ivarVal = load;
933  if (ivarSize > retTySize) {
934  llvm::Type *newTy = llvm::Type::getIntNTy(getLLVMContext(), retTySize);
935  ivarVal = Builder.CreateTrunc(load, newTy);
936  bitcastType = newTy->getPointerTo();
937  }
938  Builder.CreateStore(ivarVal,
939  Builder.CreateBitCast(ReturnValue, bitcastType));
940 
941  // Make sure we don't do an autorelease.
942  AutoreleaseResult = false;
943  return;
944  }
945 
946  case PropertyImplStrategy::GetSetProperty: {
947  llvm::Constant *getPropertyFn =
949  if (!getPropertyFn) {
950  CGM.ErrorUnsupported(propImpl, "Obj-C getter requiring atomic copy");
951  return;
952  }
953  CGCallee callee = CGCallee::forDirect(getPropertyFn);
954 
955  // Return (ivar-type) objc_getProperty((id) self, _cmd, offset, true).
956  // FIXME: Can't this be simpler? This might even be worse than the
957  // corresponding gcc code.
958  llvm::Value *cmd =
959  Builder.CreateLoad(GetAddrOfLocalVar(getterMethod->getCmdDecl()), "cmd");
961  llvm::Value *ivarOffset =
962  EmitIvarOffset(classImpl->getClassInterface(), ivar);
963 
964  CallArgList args;
965  args.add(RValue::get(self), getContext().getObjCIdType());
966  args.add(RValue::get(cmd), getContext().getObjCSelType());
967  args.add(RValue::get(ivarOffset), getContext().getPointerDiffType());
968  args.add(RValue::get(Builder.getInt1(strategy.isAtomic())),
969  getContext().BoolTy);
970 
971  // FIXME: We shouldn't need to get the function info here, the
972  // runtime already should have computed it to build the function.
973  llvm::Instruction *CallInstruction;
974  RValue RV = EmitCall(
975  getTypes().arrangeBuiltinFunctionCall(propType, args),
976  callee, ReturnValueSlot(), args, &CallInstruction);
977  if (llvm::CallInst *call = dyn_cast<llvm::CallInst>(CallInstruction))
978  call->setTailCall();
979 
980  // We need to fix the type here. Ivars with copy & retain are
981  // always objects so we don't need to worry about complex or
982  // aggregates.
984  RV.getScalarVal(),
985  getTypes().ConvertType(getterMethod->getReturnType())));
986 
987  EmitReturnOfRValue(RV, propType);
988 
989  // objc_getProperty does an autorelease, so we should suppress ours.
990  AutoreleaseResult = false;
991 
992  return;
993  }
994 
995  case PropertyImplStrategy::CopyStruct:
996  emitStructGetterCall(*this, ivar, strategy.isAtomic(),
997  strategy.hasStrongMember());
998  return;
999 
1000  case PropertyImplStrategy::Expression:
1001  case PropertyImplStrategy::SetPropertyAndExpressionGet: {
1003 
1004  QualType ivarType = ivar->getType();
1005  switch (getEvaluationKind(ivarType)) {
1006  case TEK_Complex: {
1009  /*init*/ true);
1010  return;
1011  }
1012  case TEK_Aggregate: {
1013  // The return value slot is guaranteed to not be aliased, but
1014  // that's not necessarily the same as "on the stack", so
1015  // we still potentially need objc_memmove_collectable.
1016  EmitAggregateCopy(/* Dest= */ MakeAddrLValue(ReturnValue, ivarType),
1017  /* Src= */ LV, ivarType, overlapForReturnValue());
1018  return;
1019  }
1020  case TEK_Scalar: {
1021  llvm::Value *value;
1022  if (propType->isReferenceType()) {
1023  value = LV.getAddress().getPointer();
1024  } else {
1025  // We want to load and autoreleaseReturnValue ARC __weak ivars.
1027  if (getLangOpts().ObjCAutoRefCount) {
1028  value = emitARCRetainLoadOfScalar(*this, LV, ivarType);
1029  } else {
1030  value = EmitARCLoadWeak(LV.getAddress());
1031  }
1032 
1033  // Otherwise we want to do a simple load, suppressing the
1034  // final autorelease.
1035  } else {
1036  value = EmitLoadOfLValue(LV, SourceLocation()).getScalarVal();
1037  AutoreleaseResult = false;
1038  }
1039 
1040  value = Builder.CreateBitCast(
1041  value, ConvertType(GetterMethodDecl->getReturnType()));
1042  }
1043 
1044  EmitReturnOfRValue(RValue::get(value), propType);
1045  return;
1046  }
1047  }
1048  llvm_unreachable("bad evaluation kind");
1049  }
1050 
1051  }
1052  llvm_unreachable("bad @property implementation strategy!");
1053 }
1054 
1055 /// emitStructSetterCall - Call the runtime function to store the value
1056 /// from the first formal parameter into the given ivar.
1058  ObjCIvarDecl *ivar) {
1059  // objc_copyStruct (&structIvar, &Arg,
1060  // sizeof (struct something), true, false);
1061  CallArgList args;
1062 
1063  // The first argument is the address of the ivar.
1064  llvm::Value *ivarAddr = CGF.EmitLValueForIvar(CGF.TypeOfSelfObject(),
1065  CGF.LoadObjCSelf(), ivar, 0)
1066  .getPointer();
1067  ivarAddr = CGF.Builder.CreateBitCast(ivarAddr, CGF.Int8PtrTy);
1068  args.add(RValue::get(ivarAddr), CGF.getContext().VoidPtrTy);
1069 
1070  // The second argument is the address of the parameter variable.
1071  ParmVarDecl *argVar = *OMD->param_begin();
1072  DeclRefExpr argRef(argVar, false, argVar->getType().getNonReferenceType(),
1074  llvm::Value *argAddr = CGF.EmitLValue(&argRef).getPointer();
1075  argAddr = CGF.Builder.CreateBitCast(argAddr, CGF.Int8PtrTy);
1076  args.add(RValue::get(argAddr), CGF.getContext().VoidPtrTy);
1077 
1078  // The third argument is the sizeof the type.
1079  llvm::Value *size =
1080  CGF.CGM.getSize(CGF.getContext().getTypeSizeInChars(ivar->getType()));
1081  args.add(RValue::get(size), CGF.getContext().getSizeType());
1082 
1083  // The fourth argument is the 'isAtomic' flag.
1084  args.add(RValue::get(CGF.Builder.getTrue()), CGF.getContext().BoolTy);
1085 
1086  // The fifth argument is the 'hasStrong' flag.
1087  // FIXME: should this really always be false?
1088  args.add(RValue::get(CGF.Builder.getFalse()), CGF.getContext().BoolTy);
1089 
1090  llvm::Constant *fn = CGF.CGM.getObjCRuntime().GetSetStructFunction();
1091  CGCallee callee = CGCallee::forDirect(fn);
1092  CGF.EmitCall(
1094  callee, ReturnValueSlot(), args);
1095 }
1096 
1097 /// emitCPPObjectAtomicSetterCall - Call the runtime function to store
1098 /// the value from the first formal parameter into the given ivar, using
1099 /// the Cpp API for atomic Cpp objects with non-trivial copy assignment.
1101  ObjCMethodDecl *OMD,
1102  ObjCIvarDecl *ivar,
1103  llvm::Constant *AtomicHelperFn) {
1104  // objc_copyCppObjectAtomic (&CppObjectIvar, &Arg,
1105  // AtomicHelperFn);
1106  CallArgList args;
1107 
1108  // The first argument is the address of the ivar.
1109  llvm::Value *ivarAddr =
1111  CGF.LoadObjCSelf(), ivar, 0).getPointer();
1112  ivarAddr = CGF.Builder.CreateBitCast(ivarAddr, CGF.Int8PtrTy);
1113  args.add(RValue::get(ivarAddr), CGF.getContext().VoidPtrTy);
1114 
1115  // The second argument is the address of the parameter variable.
1116  ParmVarDecl *argVar = *OMD->param_begin();
1117  DeclRefExpr argRef(argVar, false, argVar->getType().getNonReferenceType(),
1119  llvm::Value *argAddr = CGF.EmitLValue(&argRef).getPointer();
1120  argAddr = CGF.Builder.CreateBitCast(argAddr, CGF.Int8PtrTy);
1121  args.add(RValue::get(argAddr), CGF.getContext().VoidPtrTy);
1122 
1123  // Third argument is the helper function.
1124  args.add(RValue::get(AtomicHelperFn), CGF.getContext().VoidPtrTy);
1125 
1126  llvm::Constant *fn =
1128  CGCallee callee = CGCallee::forDirect(fn);
1129  CGF.EmitCall(
1131  callee, ReturnValueSlot(), args);
1132 }
1133 
1134 
1135 static bool hasTrivialSetExpr(const ObjCPropertyImplDecl *PID) {
1136  Expr *setter = PID->getSetterCXXAssignment();
1137  if (!setter) return true;
1138 
1139  // Sema only makes only of these when the ivar has a C++ class type,
1140  // so the form is pretty constrained.
1141 
1142  // An operator call is trivial if the function it calls is trivial.
1143  // This also implies that there's nothing non-trivial going on with
1144  // the arguments, because operator= can only be trivial if it's a
1145  // synthesized assignment operator and therefore both parameters are
1146  // references.
1147  if (CallExpr *call = dyn_cast<CallExpr>(setter)) {
1148  if (const FunctionDecl *callee
1149  = dyn_cast_or_null<FunctionDecl>(call->getCalleeDecl()))
1150  if (callee->isTrivial())
1151  return true;
1152  return false;
1153  }
1154 
1155  assert(isa<ExprWithCleanups>(setter));
1156  return false;
1157 }
1158 
1160  if (CGM.getLangOpts().getGC() != LangOptions::NonGC)
1161  return false;
1163 }
1164 
1165 void
1167  const ObjCPropertyImplDecl *propImpl,
1168  llvm::Constant *AtomicHelperFn) {
1169  const ObjCPropertyDecl *prop = propImpl->getPropertyDecl();
1170  ObjCIvarDecl *ivar = propImpl->getPropertyIvarDecl();
1171  ObjCMethodDecl *setterMethod = prop->getSetterMethodDecl();
1172 
1173  // Just use the setter expression if Sema gave us one and it's
1174  // non-trivial.
1175  if (!hasTrivialSetExpr(propImpl)) {
1176  if (!AtomicHelperFn)
1177  // If non-atomic, assignment is called directly.
1178  EmitStmt(propImpl->getSetterCXXAssignment());
1179  else
1180  // If atomic, assignment is called via a locking api.
1181  emitCPPObjectAtomicSetterCall(*this, setterMethod, ivar,
1182  AtomicHelperFn);
1183  return;
1184  }
1185 
1186  PropertyImplStrategy strategy(CGM, propImpl);
1187  switch (strategy.getKind()) {
1188  case PropertyImplStrategy::Native: {
1189  // We don't need to do anything for a zero-size struct.
1190  if (strategy.getIvarSize().isZero())
1191  return;
1192 
1193  Address argAddr = GetAddrOfLocalVar(*setterMethod->param_begin());
1194 
1195  LValue ivarLValue =
1196  EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), ivar, /*quals*/ 0);
1197  Address ivarAddr = ivarLValue.getAddress();
1198 
1199  // Currently, all atomic accesses have to be through integer
1200  // types, so there's no point in trying to pick a prettier type.
1201  llvm::Type *bitcastType =
1202  llvm::Type::getIntNTy(getLLVMContext(),
1203  getContext().toBits(strategy.getIvarSize()));
1204 
1205  // Cast both arguments to the chosen operation type.
1206  argAddr = Builder.CreateElementBitCast(argAddr, bitcastType);
1207  ivarAddr = Builder.CreateElementBitCast(ivarAddr, bitcastType);
1208 
1209  // This bitcast load is likely to cause some nasty IR.
1210  llvm::Value *load = Builder.CreateLoad(argAddr);
1211 
1212  // Perform an atomic store. There are no memory ordering requirements.
1213  llvm::StoreInst *store = Builder.CreateStore(load, ivarAddr);
1214  store->setAtomic(llvm::AtomicOrdering::Unordered);
1215  return;
1216  }
1217 
1218  case PropertyImplStrategy::GetSetProperty:
1219  case PropertyImplStrategy::SetPropertyAndExpressionGet: {
1220 
1221  llvm::Constant *setOptimizedPropertyFn = nullptr;
1222  llvm::Constant *setPropertyFn = nullptr;
1223  if (UseOptimizedSetter(CGM)) {
1224  // 10.8 and iOS 6.0 code and GC is off
1225  setOptimizedPropertyFn =
1226  CGM.getObjCRuntime()
1227  .GetOptimizedPropertySetFunction(strategy.isAtomic(),
1228  strategy.isCopy());
1229  if (!setOptimizedPropertyFn) {
1230  CGM.ErrorUnsupported(propImpl, "Obj-C optimized setter - NYI");
1231  return;
1232  }
1233  }
1234  else {
1235  setPropertyFn = CGM.getObjCRuntime().GetPropertySetFunction();
1236  if (!setPropertyFn) {
1237  CGM.ErrorUnsupported(propImpl, "Obj-C setter requiring atomic copy");
1238  return;
1239  }
1240  }
1241 
1242  // Emit objc_setProperty((id) self, _cmd, offset, arg,
1243  // <is-atomic>, <is-copy>).
1244  llvm::Value *cmd =
1245  Builder.CreateLoad(GetAddrOfLocalVar(setterMethod->getCmdDecl()));
1246  llvm::Value *self =
1248  llvm::Value *ivarOffset =
1249  EmitIvarOffset(classImpl->getClassInterface(), ivar);
1250  Address argAddr = GetAddrOfLocalVar(*setterMethod->param_begin());
1251  llvm::Value *arg = Builder.CreateLoad(argAddr, "arg");
1252  arg = Builder.CreateBitCast(arg, VoidPtrTy);
1253 
1254  CallArgList args;
1255  args.add(RValue::get(self), getContext().getObjCIdType());
1256  args.add(RValue::get(cmd), getContext().getObjCSelType());
1257  if (setOptimizedPropertyFn) {
1258  args.add(RValue::get(arg), getContext().getObjCIdType());
1259  args.add(RValue::get(ivarOffset), getContext().getPointerDiffType());
1260  CGCallee callee = CGCallee::forDirect(setOptimizedPropertyFn);
1261  EmitCall(getTypes().arrangeBuiltinFunctionCall(getContext().VoidTy, args),
1262  callee, ReturnValueSlot(), args);
1263  } else {
1264  args.add(RValue::get(ivarOffset), getContext().getPointerDiffType());
1265  args.add(RValue::get(arg), getContext().getObjCIdType());
1266  args.add(RValue::get(Builder.getInt1(strategy.isAtomic())),
1267  getContext().BoolTy);
1268  args.add(RValue::get(Builder.getInt1(strategy.isCopy())),
1269  getContext().BoolTy);
1270  // FIXME: We shouldn't need to get the function info here, the runtime
1271  // already should have computed it to build the function.
1272  CGCallee callee = CGCallee::forDirect(setPropertyFn);
1273  EmitCall(getTypes().arrangeBuiltinFunctionCall(getContext().VoidTy, args),
1274  callee, ReturnValueSlot(), args);
1275  }
1276 
1277  return;
1278  }
1279 
1280  case PropertyImplStrategy::CopyStruct:
1281  emitStructSetterCall(*this, setterMethod, ivar);
1282  return;
1283 
1284  case PropertyImplStrategy::Expression:
1285  break;
1286  }
1287 
1288  // Otherwise, fake up some ASTs and emit a normal assignment.
1289  ValueDecl *selfDecl = setterMethod->getSelfDecl();
1290  DeclRefExpr self(selfDecl, false, selfDecl->getType(),
1293  selfDecl->getType(), CK_LValueToRValue, &self,
1294  VK_RValue);
1295  ObjCIvarRefExpr ivarRef(ivar, ivar->getType().getNonReferenceType(),
1297  &selfLoad, true, true);
1298 
1299  ParmVarDecl *argDecl = *setterMethod->param_begin();
1300  QualType argType = argDecl->getType().getNonReferenceType();
1301  DeclRefExpr arg(argDecl, false, argType, VK_LValue, SourceLocation());
1303  argType.getUnqualifiedType(), CK_LValueToRValue,
1304  &arg, VK_RValue);
1305 
1306  // The property type can differ from the ivar type in some situations with
1307  // Objective-C pointer types, we can always bit cast the RHS in these cases.
1308  // The following absurdity is just to ensure well-formed IR.
1309  CastKind argCK = CK_NoOp;
1310  if (ivarRef.getType()->isObjCObjectPointerType()) {
1311  if (argLoad.getType()->isObjCObjectPointerType())
1312  argCK = CK_BitCast;
1313  else if (argLoad.getType()->isBlockPointerType())
1314  argCK = CK_BlockPointerToObjCPointerCast;
1315  else
1316  argCK = CK_CPointerToObjCPointerCast;
1317  } else if (ivarRef.getType()->isBlockPointerType()) {
1318  if (argLoad.getType()->isBlockPointerType())
1319  argCK = CK_BitCast;
1320  else
1321  argCK = CK_AnyPointerToBlockPointerCast;
1322  } else if (ivarRef.getType()->isPointerType()) {
1323  argCK = CK_BitCast;
1324  }
1326  ivarRef.getType(), argCK, &argLoad,
1327  VK_RValue);
1328  Expr *finalArg = &argLoad;
1329  if (!getContext().hasSameUnqualifiedType(ivarRef.getType(),
1330  argLoad.getType()))
1331  finalArg = &argCast;
1332 
1333 
1334  BinaryOperator assign(&ivarRef, finalArg, BO_Assign,
1335  ivarRef.getType(), VK_RValue, OK_Ordinary,
1336  SourceLocation(), FPOptions());
1337  EmitStmt(&assign);
1338 }
1339 
1340 /// Generate an Objective-C property setter function.
1341 ///
1342 /// The given Decl must be an ObjCImplementationDecl. \@synthesize
1343 /// is illegal within a category.
1345  const ObjCPropertyImplDecl *PID) {
1346  llvm::Constant *AtomicHelperFn =
1348  const ObjCPropertyDecl *PD = PID->getPropertyDecl();
1349  ObjCMethodDecl *OMD = PD->getSetterMethodDecl();
1350  assert(OMD && "Invalid call to generate setter (empty method)");
1351  StartObjCMethod(OMD, IMP->getClassInterface());
1352 
1353  generateObjCSetterBody(IMP, PID, AtomicHelperFn);
1354 
1355  FinishFunction();
1356 }
1357 
1358 namespace {
1359  struct DestroyIvar final : EHScopeStack::Cleanup {
1360  private:
1361  llvm::Value *addr;
1362  const ObjCIvarDecl *ivar;
1363  CodeGenFunction::Destroyer *destroyer;
1364  bool useEHCleanupForArray;
1365  public:
1366  DestroyIvar(llvm::Value *addr, const ObjCIvarDecl *ivar,
1367  CodeGenFunction::Destroyer *destroyer,
1368  bool useEHCleanupForArray)
1369  : addr(addr), ivar(ivar), destroyer(destroyer),
1370  useEHCleanupForArray(useEHCleanupForArray) {}
1371 
1372  void Emit(CodeGenFunction &CGF, Flags flags) override {
1373  LValue lvalue
1374  = CGF.EmitLValueForIvar(CGF.TypeOfSelfObject(), addr, ivar, /*CVR*/ 0);
1375  CGF.emitDestroy(lvalue.getAddress(), ivar->getType(), destroyer,
1376  flags.isForNormalCleanup() && useEHCleanupForArray);
1377  }
1378  };
1379 }
1380 
1381 /// Like CodeGenFunction::destroyARCStrong, but do it with a call.
1383  Address addr,
1384  QualType type) {
1385  llvm::Value *null = getNullForVariable(addr);
1386  CGF.EmitARCStoreStrongCall(addr, null, /*ignored*/ true);
1387 }
1388 
1390  ObjCImplementationDecl *impl) {
1392 
1393  llvm::Value *self = CGF.LoadObjCSelf();
1394 
1395  const ObjCInterfaceDecl *iface = impl->getClassInterface();
1396  for (const ObjCIvarDecl *ivar = iface->all_declared_ivar_begin();
1397  ivar; ivar = ivar->getNextIvar()) {
1398  QualType type = ivar->getType();
1399 
1400  // Check whether the ivar is a destructible type.
1401  QualType::DestructionKind dtorKind = type.isDestructedType();
1402  if (!dtorKind) continue;
1403 
1404  CodeGenFunction::Destroyer *destroyer = nullptr;
1405 
1406  // Use a call to objc_storeStrong to destroy strong ivars, for the
1407  // general benefit of the tools.
1408  if (dtorKind == QualType::DK_objc_strong_lifetime) {
1409  destroyer = destroyARCStrongWithStore;
1410 
1411  // Otherwise use the default for the destruction kind.
1412  } else {
1413  destroyer = CGF.getDestroyer(dtorKind);
1414  }
1415 
1416  CleanupKind cleanupKind = CGF.getCleanupKind(dtorKind);
1417 
1418  CGF.EHStack.pushCleanup<DestroyIvar>(cleanupKind, self, ivar, destroyer,
1419  cleanupKind & EHCleanup);
1420  }
1421 
1422  assert(scope.requiresCleanups() && "nothing to do in .cxx_destruct?");
1423 }
1424 
1426  ObjCMethodDecl *MD,
1427  bool ctor) {
1429  StartObjCMethod(MD, IMP->getClassInterface());
1430 
1431  // Emit .cxx_construct.
1432  if (ctor) {
1433  // Suppress the final autorelease in ARC.
1434  AutoreleaseResult = false;
1435 
1436  for (const auto *IvarInit : IMP->inits()) {
1437  FieldDecl *Field = IvarInit->getAnyMember();
1438  ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(Field);
1440  LoadObjCSelf(), Ivar, 0);
1441  EmitAggExpr(IvarInit->getInit(),
1446  }
1447  // constructor returns 'self'.
1448  CodeGenTypes &Types = CGM.getTypes();
1449  QualType IdTy(CGM.getContext().getObjCIdType());
1450  llvm::Value *SelfAsId =
1451  Builder.CreateBitCast(LoadObjCSelf(), Types.ConvertType(IdTy));
1452  EmitReturnOfRValue(RValue::get(SelfAsId), IdTy);
1453 
1454  // Emit .cxx_destruct.
1455  } else {
1456  emitCXXDestructMethod(*this, IMP);
1457  }
1458  FinishFunction();
1459 }
1460 
1462  VarDecl *Self = cast<ObjCMethodDecl>(CurFuncDecl)->getSelfDecl();
1463  DeclRefExpr DRE(Self, /*is enclosing local*/ (CurFuncDecl != CurCodeDecl),
1464  Self->getType(), VK_LValue, SourceLocation());
1466 }
1467 
1469  const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CurFuncDecl);
1470  ImplicitParamDecl *selfDecl = OMD->getSelfDecl();
1471  const ObjCObjectPointerType *PTy = cast<ObjCObjectPointerType>(
1472  getContext().getCanonicalType(selfDecl->getType()));
1473  return PTy->getPointeeType();
1474 }
1475 
1477  llvm::Constant *EnumerationMutationFnPtr =
1479  if (!EnumerationMutationFnPtr) {
1480  CGM.ErrorUnsupported(&S, "Obj-C fast enumeration for this runtime");
1481  return;
1482  }
1483  CGCallee EnumerationMutationFn =
1484  CGCallee::forDirect(EnumerationMutationFnPtr);
1485 
1486  CGDebugInfo *DI = getDebugInfo();
1487  if (DI)
1489 
1490  RunCleanupsScope ForScope(*this);
1491 
1492  // The local variable comes into scope immediately.
1494  if (const DeclStmt *SD = dyn_cast<DeclStmt>(S.getElement()))
1495  variable = EmitAutoVarAlloca(*cast<VarDecl>(SD->getSingleDecl()));
1496 
1497  JumpDest LoopEnd = getJumpDestInCurrentScope("forcoll.end");
1498 
1499  // Fast enumeration state.
1500  QualType StateTy = CGM.getObjCFastEnumerationStateType();
1501  Address StatePtr = CreateMemTemp(StateTy, "state.ptr");
1502  EmitNullInitialization(StatePtr, StateTy);
1503 
1504  // Number of elements in the items array.
1505  static const unsigned NumItems = 16;
1506 
1507  // Fetch the countByEnumeratingWithState:objects:count: selector.
1508  IdentifierInfo *II[] = {
1509  &CGM.getContext().Idents.get("countByEnumeratingWithState"),
1510  &CGM.getContext().Idents.get("objects"),
1511  &CGM.getContext().Idents.get("count")
1512  };
1513  Selector FastEnumSel =
1514  CGM.getContext().Selectors.getSelector(llvm::array_lengthof(II), &II[0]);
1515 
1516  QualType ItemsTy =
1517  getContext().getConstantArrayType(getContext().getObjCIdType(),
1518  llvm::APInt(32, NumItems),
1519  ArrayType::Normal, 0);
1520  Address ItemsPtr = CreateMemTemp(ItemsTy, "items.ptr");
1521 
1522  // Emit the collection pointer. In ARC, we do a retain.
1523  llvm::Value *Collection;
1524  if (getLangOpts().ObjCAutoRefCount) {
1525  Collection = EmitARCRetainScalarExpr(S.getCollection());
1526 
1527  // Enter a cleanup to do the release.
1528  EmitObjCConsumeObject(S.getCollection()->getType(), Collection);
1529  } else {
1530  Collection = EmitScalarExpr(S.getCollection());
1531  }
1532 
1533  // The 'continue' label needs to appear within the cleanup for the
1534  // collection object.
1535  JumpDest AfterBody = getJumpDestInCurrentScope("forcoll.next");
1536 
1537  // Send it our message:
1538  CallArgList Args;
1539 
1540  // The first argument is a temporary of the enumeration-state type.
1541  Args.add(RValue::get(StatePtr.getPointer()),
1542  getContext().getPointerType(StateTy));
1543 
1544  // The second argument is a temporary array with space for NumItems
1545  // pointers. We'll actually be loading elements from the array
1546  // pointer written into the control state; this buffer is so that
1547  // collections that *aren't* backed by arrays can still queue up
1548  // batches of elements.
1549  Args.add(RValue::get(ItemsPtr.getPointer()),
1550  getContext().getPointerType(ItemsTy));
1551 
1552  // The third argument is the capacity of that temporary array.
1553  llvm::Type *NSUIntegerTy = ConvertType(getContext().getNSUIntegerType());
1554  llvm::Constant *Count = llvm::ConstantInt::get(NSUIntegerTy, NumItems);
1555  Args.add(RValue::get(Count), getContext().getNSUIntegerType());
1556 
1557  // Start the enumeration.
1558  RValue CountRV =
1560  getContext().getNSUIntegerType(),
1561  FastEnumSel, Collection, Args);
1562 
1563  // The initial number of objects that were returned in the buffer.
1564  llvm::Value *initialBufferLimit = CountRV.getScalarVal();
1565 
1566  llvm::BasicBlock *EmptyBB = createBasicBlock("forcoll.empty");
1567  llvm::BasicBlock *LoopInitBB = createBasicBlock("forcoll.loopinit");
1568 
1569  llvm::Value *zero = llvm::Constant::getNullValue(NSUIntegerTy);
1570 
1571  // If the limit pointer was zero to begin with, the collection is
1572  // empty; skip all this. Set the branch weight assuming this has the same
1573  // probability of exiting the loop as any other loop exit.
1574  uint64_t EntryCount = getCurrentProfileCount();
1575  Builder.CreateCondBr(
1576  Builder.CreateICmpEQ(initialBufferLimit, zero, "iszero"), EmptyBB,
1577  LoopInitBB,
1578  createProfileWeights(EntryCount, getProfileCount(S.getBody())));
1579 
1580  // Otherwise, initialize the loop.
1581  EmitBlock(LoopInitBB);
1582 
1583  // Save the initial mutations value. This is the value at an
1584  // address that was written into the state object by
1585  // countByEnumeratingWithState:objects:count:.
1586  Address StateMutationsPtrPtr = Builder.CreateStructGEP(
1587  StatePtr, 2, 2 * getPointerSize(), "mutationsptr.ptr");
1588  llvm::Value *StateMutationsPtr
1589  = Builder.CreateLoad(StateMutationsPtrPtr, "mutationsptr");
1590 
1591  llvm::Value *initialMutations =
1592  Builder.CreateAlignedLoad(StateMutationsPtr, getPointerAlign(),
1593  "forcoll.initial-mutations");
1594 
1595  // Start looping. This is the point we return to whenever we have a
1596  // fresh, non-empty batch of objects.
1597  llvm::BasicBlock *LoopBodyBB = createBasicBlock("forcoll.loopbody");
1598  EmitBlock(LoopBodyBB);
1599 
1600  // The current index into the buffer.
1601  llvm::PHINode *index = Builder.CreatePHI(NSUIntegerTy, 3, "forcoll.index");
1602  index->addIncoming(zero, LoopInitBB);
1603 
1604  // The current buffer size.
1605  llvm::PHINode *count = Builder.CreatePHI(NSUIntegerTy, 3, "forcoll.count");
1606  count->addIncoming(initialBufferLimit, LoopInitBB);
1607 
1609 
1610  // Check whether the mutations value has changed from where it was
1611  // at start. StateMutationsPtr should actually be invariant between
1612  // refreshes.
1613  StateMutationsPtr = Builder.CreateLoad(StateMutationsPtrPtr, "mutationsptr");
1614  llvm::Value *currentMutations
1615  = Builder.CreateAlignedLoad(StateMutationsPtr, getPointerAlign(),
1616  "statemutations");
1617 
1618  llvm::BasicBlock *WasMutatedBB = createBasicBlock("forcoll.mutated");
1619  llvm::BasicBlock *WasNotMutatedBB = createBasicBlock("forcoll.notmutated");
1620 
1621  Builder.CreateCondBr(Builder.CreateICmpEQ(currentMutations, initialMutations),
1622  WasNotMutatedBB, WasMutatedBB);
1623 
1624  // If so, call the enumeration-mutation function.
1625  EmitBlock(WasMutatedBB);
1626  llvm::Value *V =
1627  Builder.CreateBitCast(Collection,
1628  ConvertType(getContext().getObjCIdType()));
1629  CallArgList Args2;
1630  Args2.add(RValue::get(V), getContext().getObjCIdType());
1631  // FIXME: We shouldn't need to get the function info here, the runtime already
1632  // should have computed it to build the function.
1633  EmitCall(
1635  EnumerationMutationFn, ReturnValueSlot(), Args2);
1636 
1637  // Otherwise, or if the mutation function returns, just continue.
1638  EmitBlock(WasNotMutatedBB);
1639 
1640  // Initialize the element variable.
1641  RunCleanupsScope elementVariableScope(*this);
1642  bool elementIsVariable;
1643  LValue elementLValue;
1644  QualType elementType;
1645  if (const DeclStmt *SD = dyn_cast<DeclStmt>(S.getElement())) {
1646  // Initialize the variable, in case it's a __block variable or something.
1647  EmitAutoVarInit(variable);
1648 
1649  const VarDecl* D = cast<VarDecl>(SD->getSingleDecl());
1650  DeclRefExpr tempDRE(const_cast<VarDecl*>(D), false, D->getType(),
1652  elementLValue = EmitLValue(&tempDRE);
1653  elementType = D->getType();
1654  elementIsVariable = true;
1655 
1656  if (D->isARCPseudoStrong())
1657  elementLValue.getQuals().setObjCLifetime(Qualifiers::OCL_ExplicitNone);
1658  } else {
1659  elementLValue = LValue(); // suppress warning
1660  elementType = cast<Expr>(S.getElement())->getType();
1661  elementIsVariable = false;
1662  }
1663  llvm::Type *convertedElementType = ConvertType(elementType);
1664 
1665  // Fetch the buffer out of the enumeration state.
1666  // TODO: this pointer should actually be invariant between
1667  // refreshes, which would help us do certain loop optimizations.
1668  Address StateItemsPtr = Builder.CreateStructGEP(
1669  StatePtr, 1, getPointerSize(), "stateitems.ptr");
1670  llvm::Value *EnumStateItems =
1671  Builder.CreateLoad(StateItemsPtr, "stateitems");
1672 
1673  // Fetch the value at the current index from the buffer.
1674  llvm::Value *CurrentItemPtr =
1675  Builder.CreateGEP(EnumStateItems, index, "currentitem.ptr");
1676  llvm::Value *CurrentItem =
1677  Builder.CreateAlignedLoad(CurrentItemPtr, getPointerAlign());
1678 
1679  // Cast that value to the right type.
1680  CurrentItem = Builder.CreateBitCast(CurrentItem, convertedElementType,
1681  "currentitem");
1682 
1683  // Make sure we have an l-value. Yes, this gets evaluated every
1684  // time through the loop.
1685  if (!elementIsVariable) {
1686  elementLValue = EmitLValue(cast<Expr>(S.getElement()));
1687  EmitStoreThroughLValue(RValue::get(CurrentItem), elementLValue);
1688  } else {
1689  EmitStoreThroughLValue(RValue::get(CurrentItem), elementLValue,
1690  /*isInit*/ true);
1691  }
1692 
1693  // If we do have an element variable, this assignment is the end of
1694  // its initialization.
1695  if (elementIsVariable)
1696  EmitAutoVarCleanups(variable);
1697 
1698  // Perform the loop body, setting up break and continue labels.
1699  BreakContinueStack.push_back(BreakContinue(LoopEnd, AfterBody));
1700  {
1701  RunCleanupsScope Scope(*this);
1702  EmitStmt(S.getBody());
1703  }
1704  BreakContinueStack.pop_back();
1705 
1706  // Destroy the element variable now.
1707  elementVariableScope.ForceCleanup();
1708 
1709  // Check whether there are more elements.
1710  EmitBlock(AfterBody.getBlock());
1711 
1712  llvm::BasicBlock *FetchMoreBB = createBasicBlock("forcoll.refetch");
1713 
1714  // First we check in the local buffer.
1715  llvm::Value *indexPlusOne =
1716  Builder.CreateAdd(index, llvm::ConstantInt::get(NSUIntegerTy, 1));
1717 
1718  // If we haven't overrun the buffer yet, we can continue.
1719  // Set the branch weights based on the simplifying assumption that this is
1720  // like a while-loop, i.e., ignoring that the false branch fetches more
1721  // elements and then returns to the loop.
1722  Builder.CreateCondBr(
1723  Builder.CreateICmpULT(indexPlusOne, count), LoopBodyBB, FetchMoreBB,
1724  createProfileWeights(getProfileCount(S.getBody()), EntryCount));
1725 
1726  index->addIncoming(indexPlusOne, AfterBody.getBlock());
1727  count->addIncoming(count, AfterBody.getBlock());
1728 
1729  // Otherwise, we have to fetch more elements.
1730  EmitBlock(FetchMoreBB);
1731 
1732  CountRV =
1734  getContext().getNSUIntegerType(),
1735  FastEnumSel, Collection, Args);
1736 
1737  // If we got a zero count, we're done.
1738  llvm::Value *refetchCount = CountRV.getScalarVal();
1739 
1740  // (note that the message send might split FetchMoreBB)
1741  index->addIncoming(zero, Builder.GetInsertBlock());
1742  count->addIncoming(refetchCount, Builder.GetInsertBlock());
1743 
1744  Builder.CreateCondBr(Builder.CreateICmpEQ(refetchCount, zero),
1745  EmptyBB, LoopBodyBB);
1746 
1747  // No more elements.
1748  EmitBlock(EmptyBB);
1749 
1750  if (!elementIsVariable) {
1751  // If the element was not a declaration, set it to be null.
1752 
1753  llvm::Value *null = llvm::Constant::getNullValue(convertedElementType);
1754  elementLValue = EmitLValue(cast<Expr>(S.getElement()));
1755  EmitStoreThroughLValue(RValue::get(null), elementLValue);
1756  }
1757 
1758  if (DI)
1760 
1761  ForScope.ForceCleanup();
1762  EmitBlock(LoopEnd.getBlock());
1763 }
1764 
1766  CGM.getObjCRuntime().EmitTryStmt(*this, S);
1767 }
1768 
1770  CGM.getObjCRuntime().EmitThrowStmt(*this, S);
1771 }
1772 
1774  const ObjCAtSynchronizedStmt &S) {
1775  CGM.getObjCRuntime().EmitSynchronizedStmt(*this, S);
1776 }
1777 
1778 namespace {
1779  struct CallObjCRelease final : EHScopeStack::Cleanup {
1780  CallObjCRelease(llvm::Value *object) : object(object) {}
1781  llvm::Value *object;
1782 
1783  void Emit(CodeGenFunction &CGF, Flags flags) override {
1784  // Releases at the end of the full-expression are imprecise.
1785  CGF.EmitARCRelease(object, ARCImpreciseLifetime);
1786  }
1787  };
1788 }
1789 
1790 /// Produce the code for a CK_ARCConsumeObject. Does a primitive
1791 /// release at the end of the full-expression.
1793  llvm::Value *object) {
1794  // If we're in a conditional branch, we need to make the cleanup
1795  // conditional.
1796  pushFullExprCleanup<CallObjCRelease>(getARCCleanupKind(), object);
1797  return object;
1798 }
1799 
1801  llvm::Value *value) {
1802  return EmitARCRetainAutorelease(type, value);
1803 }
1804 
1805 /// Given a number of pointers, inform the optimizer that they're
1806 /// being intrinsically used up until this point in the program.
1808  llvm::Constant *&fn = CGM.getObjCEntrypoints().clang_arc_use;
1809  if (!fn) {
1810  llvm::FunctionType *fnType =
1811  llvm::FunctionType::get(CGM.VoidTy, None, true);
1812  fn = CGM.CreateRuntimeFunction(fnType, "clang.arc.use");
1813  }
1814 
1815  // This isn't really a "runtime" function, but as an intrinsic it
1816  // doesn't really matter as long as we align things up.
1817  EmitNounwindRuntimeCall(fn, values);
1818 }
1819 
1820 
1821 static llvm::Constant *createARCRuntimeFunction(CodeGenModule &CGM,
1822  llvm::FunctionType *FTy,
1823  StringRef Name) {
1824  llvm::Constant *RTF = CGM.CreateRuntimeFunction(FTy, Name);
1825 
1826  if (auto *F = dyn_cast<llvm::Function>(RTF)) {
1827  // If the target runtime doesn't naturally support ARC, emit weak
1828  // references to the runtime support library. We don't really
1829  // permit this to fail, but we need a particular relocation style.
1830  if (!CGM.getLangOpts().ObjCRuntime.hasNativeARC() &&
1831  !CGM.getTriple().isOSBinFormatCOFF()) {
1832  F->setLinkage(llvm::Function::ExternalWeakLinkage);
1833  } else if (Name == "objc_retain" || Name == "objc_release") {
1834  // If we have Native ARC, set nonlazybind attribute for these APIs for
1835  // performance.
1836  F->addFnAttr(llvm::Attribute::NonLazyBind);
1837  }
1838  }
1839 
1840  return RTF;
1841 }
1842 
1843 /// Perform an operation having the signature
1844 /// i8* (i8*)
1845 /// where a null input causes a no-op and returns null.
1847  llvm::Value *value,
1848  llvm::Constant *&fn,
1849  StringRef fnName,
1850  bool isTailCall = false) {
1851  if (isa<llvm::ConstantPointerNull>(value))
1852  return value;
1853 
1854  if (!fn) {
1855  llvm::FunctionType *fnType =
1856  llvm::FunctionType::get(CGF.Int8PtrTy, CGF.Int8PtrTy, false);
1857  fn = createARCRuntimeFunction(CGF.CGM, fnType, fnName);
1858  }
1859 
1860  // Cast the argument to 'id'.
1861  llvm::Type *origType = value->getType();
1862  value = CGF.Builder.CreateBitCast(value, CGF.Int8PtrTy);
1863 
1864  // Call the function.
1865  llvm::CallInst *call = CGF.EmitNounwindRuntimeCall(fn, value);
1866  if (isTailCall)
1867  call->setTailCall();
1868 
1869  // Cast the result back to the original type.
1870  return CGF.Builder.CreateBitCast(call, origType);
1871 }
1872 
1873 /// Perform an operation having the following signature:
1874 /// i8* (i8**)
1876  Address addr,
1877  llvm::Constant *&fn,
1878  StringRef fnName) {
1879  if (!fn) {
1880  llvm::FunctionType *fnType =
1881  llvm::FunctionType::get(CGF.Int8PtrTy, CGF.Int8PtrPtrTy, false);
1882  fn = createARCRuntimeFunction(CGF.CGM, fnType, fnName);
1883  }
1884 
1885  // Cast the argument to 'id*'.
1886  llvm::Type *origType = addr.getElementType();
1887  addr = CGF.Builder.CreateBitCast(addr, CGF.Int8PtrPtrTy);
1888 
1889  // Call the function.
1890  llvm::Value *result = CGF.EmitNounwindRuntimeCall(fn, addr.getPointer());
1891 
1892  // Cast the result back to a dereference of the original type.
1893  if (origType != CGF.Int8PtrTy)
1894  result = CGF.Builder.CreateBitCast(result, origType);
1895 
1896  return result;
1897 }
1898 
1899 /// Perform an operation having the following signature:
1900 /// i8* (i8**, i8*)
1902  Address addr,
1903  llvm::Value *value,
1904  llvm::Constant *&fn,
1905  StringRef fnName,
1906  bool ignored) {
1907  assert(addr.getElementType() == value->getType());
1908 
1909  if (!fn) {
1910  llvm::Type *argTypes[] = { CGF.Int8PtrPtrTy, CGF.Int8PtrTy };
1911 
1912  llvm::FunctionType *fnType
1913  = llvm::FunctionType::get(CGF.Int8PtrTy, argTypes, false);
1914  fn = createARCRuntimeFunction(CGF.CGM, fnType, fnName);
1915  }
1916 
1917  llvm::Type *origType = value->getType();
1918 
1919  llvm::Value *args[] = {
1920  CGF.Builder.CreateBitCast(addr.getPointer(), CGF.Int8PtrPtrTy),
1921  CGF.Builder.CreateBitCast(value, CGF.Int8PtrTy)
1922  };
1923  llvm::CallInst *result = CGF.EmitNounwindRuntimeCall(fn, args);
1924 
1925  if (ignored) return nullptr;
1926 
1927  return CGF.Builder.CreateBitCast(result, origType);
1928 }
1929 
1930 /// Perform an operation having the following signature:
1931 /// void (i8**, i8**)
1933  Address dst,
1934  Address src,
1935  llvm::Constant *&fn,
1936  StringRef fnName) {
1937  assert(dst.getType() == src.getType());
1938 
1939  if (!fn) {
1940  llvm::Type *argTypes[] = { CGF.Int8PtrPtrTy, CGF.Int8PtrPtrTy };
1941 
1942  llvm::FunctionType *fnType
1943  = llvm::FunctionType::get(CGF.Builder.getVoidTy(), argTypes, false);
1944  fn = createARCRuntimeFunction(CGF.CGM, fnType, fnName);
1945  }
1946 
1947  llvm::Value *args[] = {
1948  CGF.Builder.CreateBitCast(dst.getPointer(), CGF.Int8PtrPtrTy),
1950  };
1951  CGF.EmitNounwindRuntimeCall(fn, args);
1952 }
1953 
1954 /// Produce the code to do a retain. Based on the type, calls one of:
1955 /// call i8* \@objc_retain(i8* %value)
1956 /// call i8* \@objc_retainBlock(i8* %value)
1958  if (type->isBlockPointerType())
1959  return EmitARCRetainBlock(value, /*mandatory*/ false);
1960  else
1961  return EmitARCRetainNonBlock(value);
1962 }
1963 
1964 /// Retain the given object, with normal retain semantics.
1965 /// call i8* \@objc_retain(i8* %value)
1967  return emitARCValueOperation(*this, value,
1969  "objc_retain");
1970 }
1971 
1972 /// Retain the given block, with _Block_copy semantics.
1973 /// call i8* \@objc_retainBlock(i8* %value)
1974 ///
1975 /// \param mandatory - If false, emit the call with metadata
1976 /// indicating that it's okay for the optimizer to eliminate this call
1977 /// if it can prove that the block never escapes except down the stack.
1979  bool mandatory) {
1980  llvm::Value *result
1981  = emitARCValueOperation(*this, value,
1983  "objc_retainBlock");
1984 
1985  // If the copy isn't mandatory, add !clang.arc.copy_on_escape to
1986  // tell the optimizer that it doesn't need to do this copy if the
1987  // block doesn't escape, where being passed as an argument doesn't
1988  // count as escaping.
1989  if (!mandatory && isa<llvm::Instruction>(result)) {
1990  llvm::CallInst *call
1991  = cast<llvm::CallInst>(result->stripPointerCasts());
1992  assert(call->getCalledValue() == CGM.getObjCEntrypoints().objc_retainBlock);
1993 
1994  call->setMetadata("clang.arc.copy_on_escape",
1995  llvm::MDNode::get(Builder.getContext(), None));
1996  }
1997 
1998  return result;
1999 }
2000 
2002  // Fetch the void(void) inline asm which marks that we're going to
2003  // do something with the autoreleased return value.
2004  llvm::InlineAsm *&marker
2006  if (!marker) {
2007  StringRef assembly
2008  = CGF.CGM.getTargetCodeGenInfo()
2010 
2011  // If we have an empty assembly string, there's nothing to do.
2012  if (assembly.empty()) {
2013 
2014  // Otherwise, at -O0, build an inline asm that we're going to call
2015  // in a moment.
2016  } else if (CGF.CGM.getCodeGenOpts().OptimizationLevel == 0) {
2017  llvm::FunctionType *type =
2018  llvm::FunctionType::get(CGF.VoidTy, /*variadic*/false);
2019 
2020  marker = llvm::InlineAsm::get(type, assembly, "", /*sideeffects*/ true);
2021 
2022  // If we're at -O1 and above, we don't want to litter the code
2023  // with this marker yet, so leave a breadcrumb for the ARC
2024  // optimizer to pick up.
2025  } else {
2026  llvm::NamedMDNode *metadata =
2027  CGF.CGM.getModule().getOrInsertNamedMetadata(
2028  "clang.arc.retainAutoreleasedReturnValueMarker");
2029  assert(metadata->getNumOperands() <= 1);
2030  if (metadata->getNumOperands() == 0) {
2031  auto &ctx = CGF.getLLVMContext();
2032  metadata->addOperand(llvm::MDNode::get(ctx,
2033  llvm::MDString::get(ctx, assembly)));
2034  }
2035  }
2036  }
2037 
2038  // Call the marker asm if we made one, which we do only at -O0.
2039  if (marker)
2040  CGF.Builder.CreateCall(marker, None, CGF.getBundlesForFunclet(marker));
2041 }
2042 
2043 /// Retain the given object which is the result of a function call.
2044 /// call i8* \@objc_retainAutoreleasedReturnValue(i8* %value)
2045 ///
2046 /// Yes, this function name is one character away from a different
2047 /// call with completely different semantics.
2048 llvm::Value *
2051  return emitARCValueOperation(*this, value,
2053  "objc_retainAutoreleasedReturnValue");
2054 }
2055 
2056 /// Claim a possibly-autoreleased return value at +0. This is only
2057 /// valid to do in contexts which do not rely on the retain to keep
2058 /// the object valid for all of its uses; for example, when
2059 /// the value is ignored, or when it is being assigned to an
2060 /// __unsafe_unretained variable.
2061 ///
2062 /// call i8* \@objc_unsafeClaimAutoreleasedReturnValue(i8* %value)
2063 llvm::Value *
2066  return emitARCValueOperation(*this, value,
2068  "objc_unsafeClaimAutoreleasedReturnValue");
2069 }
2070 
2071 /// Release the given object.
2072 /// call void \@objc_release(i8* %value)
2074  ARCPreciseLifetime_t precise) {
2075  if (isa<llvm::ConstantPointerNull>(value)) return;
2076 
2077  llvm::Constant *&fn = CGM.getObjCEntrypoints().objc_release;
2078  if (!fn) {
2079  llvm::FunctionType *fnType =
2080  llvm::FunctionType::get(Builder.getVoidTy(), Int8PtrTy, false);
2081  fn = createARCRuntimeFunction(CGM, fnType, "objc_release");
2082  }
2083 
2084  // Cast the argument to 'id'.
2085  value = Builder.CreateBitCast(value, Int8PtrTy);
2086 
2087  // Call objc_release.
2088  llvm::CallInst *call = EmitNounwindRuntimeCall(fn, value);
2089 
2090  if (precise == ARCImpreciseLifetime) {
2091  call->setMetadata("clang.imprecise_release",
2092  llvm::MDNode::get(Builder.getContext(), None));
2093  }
2094 }
2095 
2096 /// Destroy a __strong variable.
2097 ///
2098 /// At -O0, emit a call to store 'null' into the address;
2099 /// instrumenting tools prefer this because the address is exposed,
2100 /// but it's relatively cumbersome to optimize.
2101 ///
2102 /// At -O1 and above, just load and call objc_release.
2103 ///
2104 /// call void \@objc_storeStrong(i8** %addr, i8* null)
2106  ARCPreciseLifetime_t precise) {
2107  if (CGM.getCodeGenOpts().OptimizationLevel == 0) {
2108  llvm::Value *null = getNullForVariable(addr);
2109  EmitARCStoreStrongCall(addr, null, /*ignored*/ true);
2110  return;
2111  }
2112 
2113  llvm::Value *value = Builder.CreateLoad(addr);
2114  EmitARCRelease(value, precise);
2115 }
2116 
2117 /// Store into a strong object. Always calls this:
2118 /// call void \@objc_storeStrong(i8** %addr, i8* %value)
2120  llvm::Value *value,
2121  bool ignored) {
2122  assert(addr.getElementType() == value->getType());
2123 
2124  llvm::Constant *&fn = CGM.getObjCEntrypoints().objc_storeStrong;
2125  if (!fn) {
2126  llvm::Type *argTypes[] = { Int8PtrPtrTy, Int8PtrTy };
2127  llvm::FunctionType *fnType
2128  = llvm::FunctionType::get(Builder.getVoidTy(), argTypes, false);
2129  fn = createARCRuntimeFunction(CGM, fnType, "objc_storeStrong");
2130  }
2131 
2132  llvm::Value *args[] = {
2135  };
2136  EmitNounwindRuntimeCall(fn, args);
2137 
2138  if (ignored) return nullptr;
2139  return value;
2140 }
2141 
2142 /// Store into a strong object. Sometimes calls this:
2143 /// call void \@objc_storeStrong(i8** %addr, i8* %value)
2144 /// Other times, breaks it down into components.
2146  llvm::Value *newValue,
2147  bool ignored) {
2148  QualType type = dst.getType();
2149  bool isBlock = type->isBlockPointerType();
2150 
2151  // Use a store barrier at -O0 unless this is a block type or the
2152  // lvalue is inadequately aligned.
2153  if (shouldUseFusedARCCalls() &&
2154  !isBlock &&
2155  (dst.getAlignment().isZero() ||
2157  return EmitARCStoreStrongCall(dst.getAddress(), newValue, ignored);
2158  }
2159 
2160  // Otherwise, split it out.
2161 
2162  // Retain the new value.
2163  newValue = EmitARCRetain(type, newValue);
2164 
2165  // Read the old value.
2166  llvm::Value *oldValue = EmitLoadOfScalar(dst, SourceLocation());
2167 
2168  // Store. We do this before the release so that any deallocs won't
2169  // see the old value.
2170  EmitStoreOfScalar(newValue, dst);
2171 
2172  // Finally, release the old value.
2173  EmitARCRelease(oldValue, dst.isARCPreciseLifetime());
2174 
2175  return newValue;
2176 }
2177 
2178 /// Autorelease the given object.
2179 /// call i8* \@objc_autorelease(i8* %value)
2181  return emitARCValueOperation(*this, value,
2183  "objc_autorelease");
2184 }
2185 
2186 /// Autorelease the given object.
2187 /// call i8* \@objc_autoreleaseReturnValue(i8* %value)
2188 llvm::Value *
2190  return emitARCValueOperation(*this, value,
2192  "objc_autoreleaseReturnValue",
2193  /*isTailCall*/ true);
2194 }
2195 
2196 /// Do a fused retain/autorelease of the given object.
2197 /// call i8* \@objc_retainAutoreleaseReturnValue(i8* %value)
2198 llvm::Value *
2200  return emitARCValueOperation(*this, value,
2202  "objc_retainAutoreleaseReturnValue",
2203  /*isTailCall*/ true);
2204 }
2205 
2206 /// Do a fused retain/autorelease of the given object.
2207 /// call i8* \@objc_retainAutorelease(i8* %value)
2208 /// or
2209 /// %retain = call i8* \@objc_retainBlock(i8* %value)
2210 /// call i8* \@objc_autorelease(i8* %retain)
2212  llvm::Value *value) {
2213  if (!type->isBlockPointerType())
2214  return EmitARCRetainAutoreleaseNonBlock(value);
2215 
2216  if (isa<llvm::ConstantPointerNull>(value)) return value;
2217 
2218  llvm::Type *origType = value->getType();
2219  value = Builder.CreateBitCast(value, Int8PtrTy);
2220  value = EmitARCRetainBlock(value, /*mandatory*/ true);
2221  value = EmitARCAutorelease(value);
2222  return Builder.CreateBitCast(value, origType);
2223 }
2224 
2225 /// Do a fused retain/autorelease of the given object.
2226 /// call i8* \@objc_retainAutorelease(i8* %value)
2227 llvm::Value *
2229  return emitARCValueOperation(*this, value,
2231  "objc_retainAutorelease");
2232 }
2233 
2234 /// i8* \@objc_loadWeak(i8** %addr)
2235 /// Essentially objc_autorelease(objc_loadWeakRetained(addr)).
2237  return emitARCLoadOperation(*this, addr,
2239  "objc_loadWeak");
2240 }
2241 
2242 /// i8* \@objc_loadWeakRetained(i8** %addr)
2244  return emitARCLoadOperation(*this, addr,
2246  "objc_loadWeakRetained");
2247 }
2248 
2249 /// i8* \@objc_storeWeak(i8** %addr, i8* %value)
2250 /// Returns %value.
2252  llvm::Value *value,
2253  bool ignored) {
2254  return emitARCStoreOperation(*this, addr, value,
2256  "objc_storeWeak", ignored);
2257 }
2258 
2259 /// i8* \@objc_initWeak(i8** %addr, i8* %value)
2260 /// Returns %value. %addr is known to not have a current weak entry.
2261 /// Essentially equivalent to:
2262 /// *addr = nil; objc_storeWeak(addr, value);
2264  // If we're initializing to null, just write null to memory; no need
2265  // to get the runtime involved. But don't do this if optimization
2266  // is enabled, because accounting for this would make the optimizer
2267  // much more complicated.
2268  if (isa<llvm::ConstantPointerNull>(value) &&
2269  CGM.getCodeGenOpts().OptimizationLevel == 0) {
2270  Builder.CreateStore(value, addr);
2271  return;
2272  }
2273 
2274  emitARCStoreOperation(*this, addr, value,
2276  "objc_initWeak", /*ignored*/ true);
2277 }
2278 
2279 /// void \@objc_destroyWeak(i8** %addr)
2280 /// Essentially objc_storeWeak(addr, nil).
2282  llvm::Constant *&fn = CGM.getObjCEntrypoints().objc_destroyWeak;
2283  if (!fn) {
2284  llvm::FunctionType *fnType =
2285  llvm::FunctionType::get(Builder.getVoidTy(), Int8PtrPtrTy, false);
2286  fn = createARCRuntimeFunction(CGM, fnType, "objc_destroyWeak");
2287  }
2288 
2289  // Cast the argument to 'id*'.
2290  addr = Builder.CreateBitCast(addr, Int8PtrPtrTy);
2291 
2292  EmitNounwindRuntimeCall(fn, addr.getPointer());
2293 }
2294 
2295 /// void \@objc_moveWeak(i8** %dest, i8** %src)
2296 /// Disregards the current value in %dest. Leaves %src pointing to nothing.
2297 /// Essentially (objc_copyWeak(dest, src), objc_destroyWeak(src)).
2299  emitARCCopyOperation(*this, dst, src,
2301  "objc_moveWeak");
2302 }
2303 
2304 /// void \@objc_copyWeak(i8** %dest, i8** %src)
2305 /// Disregards the current value in %dest. Essentially
2306 /// objc_release(objc_initWeak(dest, objc_readWeakRetained(src)))
2308  emitARCCopyOperation(*this, dst, src,
2310  "objc_copyWeak");
2311 }
2312 
2314  Address SrcAddr) {
2315  llvm::Value *Object = EmitARCLoadWeakRetained(SrcAddr);
2316  Object = EmitObjCConsumeObject(Ty, Object);
2317  EmitARCStoreWeak(DstAddr, Object, false);
2318 }
2319 
2321  Address SrcAddr) {
2322  llvm::Value *Object = EmitARCLoadWeakRetained(SrcAddr);
2323  Object = EmitObjCConsumeObject(Ty, Object);
2324  EmitARCStoreWeak(DstAddr, Object, false);
2325  EmitARCDestroyWeak(SrcAddr);
2326 }
2327 
2328 /// Produce the code to do a objc_autoreleasepool_push.
2329 /// call i8* \@objc_autoreleasePoolPush(void)
2331  llvm::Constant *&fn = CGM.getObjCEntrypoints().objc_autoreleasePoolPush;
2332  if (!fn) {
2333  llvm::FunctionType *fnType =
2334  llvm::FunctionType::get(Int8PtrTy, false);
2335  fn = createARCRuntimeFunction(CGM, fnType, "objc_autoreleasePoolPush");
2336  }
2337 
2338  return EmitNounwindRuntimeCall(fn);
2339 }
2340 
2341 /// Produce the code to do a primitive release.
2342 /// call void \@objc_autoreleasePoolPop(i8* %ptr)
2344  assert(value->getType() == Int8PtrTy);
2345 
2346  llvm::Constant *&fn = CGM.getObjCEntrypoints().objc_autoreleasePoolPop;
2347  if (!fn) {
2348  llvm::FunctionType *fnType =
2349  llvm::FunctionType::get(Builder.getVoidTy(), Int8PtrTy, false);
2350 
2351  // We don't want to use a weak import here; instead we should not
2352  // fall into this path.
2353  fn = createARCRuntimeFunction(CGM, fnType, "objc_autoreleasePoolPop");
2354  }
2355 
2356  // objc_autoreleasePoolPop can throw.
2357  EmitRuntimeCallOrInvoke(fn, value);
2358 }
2359 
2360 /// Produce the code to do an MRR version objc_autoreleasepool_push.
2361 /// Which is: [[NSAutoreleasePool alloc] init];
2362 /// Where alloc is declared as: + (id) alloc; in NSAutoreleasePool class.
2363 /// init is declared as: - (id) init; in its NSObject super class.
2364 ///
2366  CGObjCRuntime &Runtime = CGM.getObjCRuntime();
2367  llvm::Value *Receiver = Runtime.EmitNSAutoreleasePoolClassRef(*this);
2368  // [NSAutoreleasePool alloc]
2369  IdentifierInfo *II = &CGM.getContext().Idents.get("alloc");
2370  Selector AllocSel = getContext().Selectors.getSelector(0, &II);
2371  CallArgList Args;
2372  RValue AllocRV =
2373  Runtime.GenerateMessageSend(*this, ReturnValueSlot(),
2374  getContext().getObjCIdType(),
2375  AllocSel, Receiver, Args);
2376 
2377  // [Receiver init]
2378  Receiver = AllocRV.getScalarVal();
2379  II = &CGM.getContext().Idents.get("init");
2380  Selector InitSel = getContext().Selectors.getSelector(0, &II);
2381  RValue InitRV =
2382  Runtime.GenerateMessageSend(*this, ReturnValueSlot(),
2383  getContext().getObjCIdType(),
2384  InitSel, Receiver, Args);
2385  return InitRV.getScalarVal();
2386 }
2387 
2388 /// Produce the code to do a primitive release.
2389 /// [tmp drain];
2391  IdentifierInfo *II = &CGM.getContext().Idents.get("drain");
2392  Selector DrainSel = getContext().Selectors.getSelector(0, &II);
2393  CallArgList Args;
2395  getContext().VoidTy, DrainSel, Arg, Args);
2396 }
2397 
2399  Address addr,
2400  QualType type) {
2402 }
2403 
2405  Address addr,
2406  QualType type) {
2408 }
2409 
2411  Address addr,
2412  QualType type) {
2413  CGF.EmitARCDestroyWeak(addr);
2414 }
2415 
2417  QualType type) {
2418  llvm::Value *value = CGF.Builder.CreateLoad(addr);
2419  CGF.EmitARCIntrinsicUse(value);
2420 }
2421 
2422 namespace {
2423  struct CallObjCAutoreleasePoolObject final : EHScopeStack::Cleanup {
2424  llvm::Value *Token;
2425 
2426  CallObjCAutoreleasePoolObject(llvm::Value *token) : Token(token) {}
2427 
2428  void Emit(CodeGenFunction &CGF, Flags flags) override {
2429  CGF.EmitObjCAutoreleasePoolPop(Token);
2430  }
2431  };
2432  struct CallObjCMRRAutoreleasePoolObject final : EHScopeStack::Cleanup {
2433  llvm::Value *Token;
2434 
2435  CallObjCMRRAutoreleasePoolObject(llvm::Value *token) : Token(token) {}
2436 
2437  void Emit(CodeGenFunction &CGF, Flags flags) override {
2438  CGF.EmitObjCMRRAutoreleasePoolPop(Token);
2439  }
2440  };
2441 }
2442 
2444  if (CGM.getLangOpts().ObjCAutoRefCount)
2445  EHStack.pushCleanup<CallObjCAutoreleasePoolObject>(NormalCleanup, Ptr);
2446  else
2447  EHStack.pushCleanup<CallObjCMRRAutoreleasePoolObject>(NormalCleanup, Ptr);
2448 }
2449 
2451  switch (lifetime) {
2452  case Qualifiers::OCL_None:
2456  return true;
2457 
2458  case Qualifiers::OCL_Weak:
2459  return false;
2460  }
2461 
2462  llvm_unreachable("impossible lifetime!");
2463 }
2464 
2466  LValue lvalue,
2467  QualType type) {
2468  llvm::Value *result;
2469  bool shouldRetain = shouldRetainObjCLifetime(type.getObjCLifetime());
2470  if (shouldRetain) {
2471  result = CGF.EmitLoadOfLValue(lvalue, SourceLocation()).getScalarVal();
2472  } else {
2473  assert(type.getObjCLifetime() == Qualifiers::OCL_Weak);
2474  result = CGF.EmitARCLoadWeakRetained(lvalue.getAddress());
2475  }
2476  return TryEmitResult(result, !shouldRetain);
2477 }
2478 
2480  const Expr *e) {
2481  e = e->IgnoreParens();
2482  QualType type = e->getType();
2483 
2484  // If we're loading retained from a __strong xvalue, we can avoid
2485  // an extra retain/release pair by zeroing out the source of this
2486  // "move" operation.
2487  if (e->isXValue() &&
2488  !type.isConstQualified() &&
2490  // Emit the lvalue.
2491  LValue lv = CGF.EmitLValue(e);
2492 
2493  // Load the object pointer.
2494  llvm::Value *result = CGF.EmitLoadOfLValue(lv,
2496 
2497  // Set the source pointer to NULL.
2499 
2500  return TryEmitResult(result, true);
2501  }
2502 
2503  // As a very special optimization, in ARC++, if the l-value is the
2504  // result of a non-volatile assignment, do a simple retain of the
2505  // result of the call to objc_storeWeak instead of reloading.
2506  if (CGF.getLangOpts().CPlusPlus &&
2507  !type.isVolatileQualified() &&
2509  isa<BinaryOperator>(e) &&
2510  cast<BinaryOperator>(e)->getOpcode() == BO_Assign)
2511  return TryEmitResult(CGF.EmitScalarExpr(e), false);
2512 
2513  // Try to emit code for scalar constant instead of emitting LValue and
2514  // loading it because we are not guaranteed to have an l-value. One of such
2515  // cases is DeclRefExpr referencing non-odr-used constant-evaluated variable.
2516  if (const auto *decl_expr = dyn_cast<DeclRefExpr>(e)) {
2517  auto *DRE = const_cast<DeclRefExpr *>(decl_expr);
2518  if (CodeGenFunction::ConstantEmission constant = CGF.tryEmitAsConstant(DRE))
2519  return TryEmitResult(CGF.emitScalarConstant(constant, DRE),
2521  }
2522 
2523  return tryEmitARCRetainLoadOfScalar(CGF, CGF.EmitLValue(e), type);
2524 }
2525 
2526 typedef llvm::function_ref<llvm::Value *(CodeGenFunction &CGF,
2527  llvm::Value *value)>
2529 
2530 /// Insert code immediately after a call.
2532  llvm::Value *value,
2533  ValueTransform doAfterCall,
2534  ValueTransform doFallback) {
2535  if (llvm::CallInst *call = dyn_cast<llvm::CallInst>(value)) {
2536  CGBuilderTy::InsertPoint ip = CGF.Builder.saveIP();
2537 
2538  // Place the retain immediately following the call.
2539  CGF.Builder.SetInsertPoint(call->getParent(),
2540  ++llvm::BasicBlock::iterator(call));
2541  value = doAfterCall(CGF, value);
2542 
2543  CGF.Builder.restoreIP(ip);
2544  return value;
2545  } else if (llvm::InvokeInst *invoke = dyn_cast<llvm::InvokeInst>(value)) {
2546  CGBuilderTy::InsertPoint ip = CGF.Builder.saveIP();
2547 
2548  // Place the retain at the beginning of the normal destination block.
2549  llvm::BasicBlock *BB = invoke->getNormalDest();
2550  CGF.Builder.SetInsertPoint(BB, BB->begin());
2551  value = doAfterCall(CGF, value);
2552 
2553  CGF.Builder.restoreIP(ip);
2554  return value;
2555 
2556  // Bitcasts can arise because of related-result returns. Rewrite
2557  // the operand.
2558  } else if (llvm::BitCastInst *bitcast = dyn_cast<llvm::BitCastInst>(value)) {
2559  llvm::Value *operand = bitcast->getOperand(0);
2560  operand = emitARCOperationAfterCall(CGF, operand, doAfterCall, doFallback);
2561  bitcast->setOperand(0, operand);
2562  return bitcast;
2563 
2564  // Generic fall-back case.
2565  } else {
2566  // Retain using the non-block variant: we never need to do a copy
2567  // of a block that's been returned to us.
2568  return doFallback(CGF, value);
2569  }
2570 }
2571 
2572 /// Given that the given expression is some sort of call (which does
2573 /// not return retained), emit a retain following it.
2575  const Expr *e) {
2576  llvm::Value *value = CGF.EmitScalarExpr(e);
2577  return emitARCOperationAfterCall(CGF, value,
2578  [](CodeGenFunction &CGF, llvm::Value *value) {
2579  return CGF.EmitARCRetainAutoreleasedReturnValue(value);
2580  },
2581  [](CodeGenFunction &CGF, llvm::Value *value) {
2582  return CGF.EmitARCRetainNonBlock(value);
2583  });
2584 }
2585 
2586 /// Given that the given expression is some sort of call (which does
2587 /// not return retained), perform an unsafeClaim following it.
2589  const Expr *e) {
2590  llvm::Value *value = CGF.EmitScalarExpr(e);
2591  return emitARCOperationAfterCall(CGF, value,
2592  [](CodeGenFunction &CGF, llvm::Value *value) {
2594  },
2595  [](CodeGenFunction &CGF, llvm::Value *value) {
2596  return value;
2597  });
2598 }
2599 
2601  bool allowUnsafeClaim) {
2602  if (allowUnsafeClaim &&
2604  return emitARCUnsafeClaimCallResult(*this, E);
2605  } else {
2606  llvm::Value *value = emitARCRetainCallResult(*this, E);
2607  return EmitObjCConsumeObject(E->getType(), value);
2608  }
2609 }
2610 
2611 /// Determine whether it might be important to emit a separate
2612 /// objc_retain_block on the result of the given expression, or
2613 /// whether it's okay to just emit it in a +1 context.
2614 static bool shouldEmitSeparateBlockRetain(const Expr *e) {
2615  assert(e->getType()->isBlockPointerType());
2616  e = e->IgnoreParens();
2617 
2618  // For future goodness, emit block expressions directly in +1
2619  // contexts if we can.
2620  if (isa<BlockExpr>(e))
2621  return false;
2622 
2623  if (const CastExpr *cast = dyn_cast<CastExpr>(e)) {
2624  switch (cast->getCastKind()) {
2625  // Emitting these operations in +1 contexts is goodness.
2626  case CK_LValueToRValue:
2627  case CK_ARCReclaimReturnedObject:
2628  case CK_ARCConsumeObject:
2629  case CK_ARCProduceObject:
2630  return false;
2631 
2632  // These operations preserve a block type.
2633  case CK_NoOp:
2634  case CK_BitCast:
2635  return shouldEmitSeparateBlockRetain(cast->getSubExpr());
2636 
2637  // These operations are known to be bad (or haven't been considered).
2638  case CK_AnyPointerToBlockPointerCast:
2639  default:
2640  return true;
2641  }
2642  }
2643 
2644  return true;
2645 }
2646 
2647 namespace {
2648 /// A CRTP base class for emitting expressions of retainable object
2649 /// pointer type in ARC.
2650 template <typename Impl, typename Result> class ARCExprEmitter {
2651 protected:
2652  CodeGenFunction &CGF;
2653  Impl &asImpl() { return *static_cast<Impl*>(this); }
2654 
2655  ARCExprEmitter(CodeGenFunction &CGF) : CGF(CGF) {}
2656 
2657 public:
2658  Result visit(const Expr *e);
2659  Result visitCastExpr(const CastExpr *e);
2660  Result visitPseudoObjectExpr(const PseudoObjectExpr *e);
2661  Result visitBinaryOperator(const BinaryOperator *e);
2662  Result visitBinAssign(const BinaryOperator *e);
2663  Result visitBinAssignUnsafeUnretained(const BinaryOperator *e);
2664  Result visitBinAssignAutoreleasing(const BinaryOperator *e);
2665  Result visitBinAssignWeak(const BinaryOperator *e);
2666  Result visitBinAssignStrong(const BinaryOperator *e);
2667 
2668  // Minimal implementation:
2669  // Result visitLValueToRValue(const Expr *e)
2670  // Result visitConsumeObject(const Expr *e)
2671  // Result visitExtendBlockObject(const Expr *e)
2672  // Result visitReclaimReturnedObject(const Expr *e)
2673  // Result visitCall(const Expr *e)
2674  // Result visitExpr(const Expr *e)
2675  //
2676  // Result emitBitCast(Result result, llvm::Type *resultType)
2677  // llvm::Value *getValueOfResult(Result result)
2678 };
2679 }
2680 
2681 /// Try to emit a PseudoObjectExpr under special ARC rules.
2682 ///
2683 /// This massively duplicates emitPseudoObjectRValue.
2684 template <typename Impl, typename Result>
2685 Result
2686 ARCExprEmitter<Impl,Result>::visitPseudoObjectExpr(const PseudoObjectExpr *E) {
2688 
2689  // Find the result expression.
2690  const Expr *resultExpr = E->getResultExpr();
2691  assert(resultExpr);
2692  Result result;
2693 
2695  i = E->semantics_begin(), e = E->semantics_end(); i != e; ++i) {
2696  const Expr *semantic = *i;
2697 
2698  // If this semantic expression is an opaque value, bind it
2699  // to the result of its source expression.
2700  if (const OpaqueValueExpr *ov = dyn_cast<OpaqueValueExpr>(semantic)) {
2702  OVMA opaqueData;
2703 
2704  // If this semantic is the result of the pseudo-object
2705  // expression, try to evaluate the source as +1.
2706  if (ov == resultExpr) {
2707  assert(!OVMA::shouldBindAsLValue(ov));
2708  result = asImpl().visit(ov->getSourceExpr());
2709  opaqueData = OVMA::bind(CGF, ov,
2710  RValue::get(asImpl().getValueOfResult(result)));
2711 
2712  // Otherwise, just bind it.
2713  } else {
2714  opaqueData = OVMA::bind(CGF, ov, ov->getSourceExpr());
2715  }
2716  opaques.push_back(opaqueData);
2717 
2718  // Otherwise, if the expression is the result, evaluate it
2719  // and remember the result.
2720  } else if (semantic == resultExpr) {
2721  result = asImpl().visit(semantic);
2722 
2723  // Otherwise, evaluate the expression in an ignored context.
2724  } else {
2725  CGF.EmitIgnoredExpr(semantic);
2726  }
2727  }
2728 
2729  // Unbind all the opaques now.
2730  for (unsigned i = 0, e = opaques.size(); i != e; ++i)
2731  opaques[i].unbind(CGF);
2732 
2733  return result;
2734 }
2735 
2736 template <typename Impl, typename Result>
2737 Result ARCExprEmitter<Impl,Result>::visitCastExpr(const CastExpr *e) {
2738  switch (e->getCastKind()) {
2739 
2740  // No-op casts don't change the type, so we just ignore them.
2741  case CK_NoOp:
2742  return asImpl().visit(e->getSubExpr());
2743 
2744  // These casts can change the type.
2745  case CK_CPointerToObjCPointerCast:
2746  case CK_BlockPointerToObjCPointerCast:
2747  case CK_AnyPointerToBlockPointerCast:
2748  case CK_BitCast: {
2749  llvm::Type *resultType = CGF.ConvertType(e->getType());
2750  assert(e->getSubExpr()->getType()->hasPointerRepresentation());
2751  Result result = asImpl().visit(e->getSubExpr());
2752  return asImpl().emitBitCast(result, resultType);
2753  }
2754 
2755  // Handle some casts specially.
2756  case CK_LValueToRValue:
2757  return asImpl().visitLValueToRValue(e->getSubExpr());
2758  case CK_ARCConsumeObject:
2759  return asImpl().visitConsumeObject(e->getSubExpr());
2760  case CK_ARCExtendBlockObject:
2761  return asImpl().visitExtendBlockObject(e->getSubExpr());
2762  case CK_ARCReclaimReturnedObject:
2763  return asImpl().visitReclaimReturnedObject(e->getSubExpr());
2764 
2765  // Otherwise, use the default logic.
2766  default:
2767  return asImpl().visitExpr(e);
2768  }
2769 }
2770 
2771 template <typename Impl, typename Result>
2772 Result
2773 ARCExprEmitter<Impl,Result>::visitBinaryOperator(const BinaryOperator *e) {
2774  switch (e->getOpcode()) {
2775  case BO_Comma:
2776  CGF.EmitIgnoredExpr(e->getLHS());
2777  CGF.EnsureInsertPoint();
2778  return asImpl().visit(e->getRHS());
2779 
2780  case BO_Assign:
2781  return asImpl().visitBinAssign(e);
2782 
2783  default:
2784  return asImpl().visitExpr(e);
2785  }
2786 }
2787 
2788 template <typename Impl, typename Result>
2789 Result ARCExprEmitter<Impl,Result>::visitBinAssign(const BinaryOperator *e) {
2790  switch (e->getLHS()->getType().getObjCLifetime()) {
2792  return asImpl().visitBinAssignUnsafeUnretained(e);
2793 
2794  case Qualifiers::OCL_Weak:
2795  return asImpl().visitBinAssignWeak(e);
2796 
2798  return asImpl().visitBinAssignAutoreleasing(e);
2799 
2801  return asImpl().visitBinAssignStrong(e);
2802 
2803  case Qualifiers::OCL_None:
2804  return asImpl().visitExpr(e);
2805  }
2806  llvm_unreachable("bad ObjC ownership qualifier");
2807 }
2808 
2809 /// The default rule for __unsafe_unretained emits the RHS recursively,
2810 /// stores into the unsafe variable, and propagates the result outward.
2811 template <typename Impl, typename Result>
2812 Result ARCExprEmitter<Impl,Result>::
2813  visitBinAssignUnsafeUnretained(const BinaryOperator *e) {
2814  // Recursively emit the RHS.
2815  // For __block safety, do this before emitting the LHS.
2816  Result result = asImpl().visit(e->getRHS());
2817 
2818  // Perform the store.
2819  LValue lvalue =
2821  CGF.EmitStoreThroughLValue(RValue::get(asImpl().getValueOfResult(result)),
2822  lvalue);
2823 
2824  return result;
2825 }
2826 
2827 template <typename Impl, typename Result>
2828 Result
2829 ARCExprEmitter<Impl,Result>::visitBinAssignAutoreleasing(const BinaryOperator *e) {
2830  return asImpl().visitExpr(e);
2831 }
2832 
2833 template <typename Impl, typename Result>
2834 Result
2835 ARCExprEmitter<Impl,Result>::visitBinAssignWeak(const BinaryOperator *e) {
2836  return asImpl().visitExpr(e);
2837 }
2838 
2839 template <typename Impl, typename Result>
2840 Result
2841 ARCExprEmitter<Impl,Result>::visitBinAssignStrong(const BinaryOperator *e) {
2842  return asImpl().visitExpr(e);
2843 }
2844 
2845 /// The general expression-emission logic.
2846 template <typename Impl, typename Result>
2847 Result ARCExprEmitter<Impl,Result>::visit(const Expr *e) {
2848  // We should *never* see a nested full-expression here, because if
2849  // we fail to emit at +1, our caller must not retain after we close
2850  // out the full-expression. This isn't as important in the unsafe
2851  // emitter.
2852  assert(!isa<ExprWithCleanups>(e));
2853 
2854  // Look through parens, __extension__, generic selection, etc.
2855  e = e->IgnoreParens();
2856 
2857  // Handle certain kinds of casts.
2858  if (const CastExpr *ce = dyn_cast<CastExpr>(e)) {
2859  return asImpl().visitCastExpr(ce);
2860 
2861  // Handle the comma operator.
2862  } else if (auto op = dyn_cast<BinaryOperator>(e)) {
2863  return asImpl().visitBinaryOperator(op);
2864 
2865  // TODO: handle conditional operators here
2866 
2867  // For calls and message sends, use the retained-call logic.
2868  // Delegate inits are a special case in that they're the only
2869  // returns-retained expression that *isn't* surrounded by
2870  // a consume.
2871  } else if (isa<CallExpr>(e) ||
2872  (isa<ObjCMessageExpr>(e) &&
2873  !cast<ObjCMessageExpr>(e)->isDelegateInitCall())) {
2874  return asImpl().visitCall(e);
2875 
2876  // Look through pseudo-object expressions.
2877  } else if (const PseudoObjectExpr *pseudo = dyn_cast<PseudoObjectExpr>(e)) {
2878  return asImpl().visitPseudoObjectExpr(pseudo);
2879  }
2880 
2881  return asImpl().visitExpr(e);
2882 }
2883 
2884 namespace {
2885 
2886 /// An emitter for +1 results.
2887 struct ARCRetainExprEmitter :
2888  public ARCExprEmitter<ARCRetainExprEmitter, TryEmitResult> {
2889 
2890  ARCRetainExprEmitter(CodeGenFunction &CGF) : ARCExprEmitter(CGF) {}
2891 
2892  llvm::Value *getValueOfResult(TryEmitResult result) {
2893  return result.getPointer();
2894  }
2895 
2896  TryEmitResult emitBitCast(TryEmitResult result, llvm::Type *resultType) {
2897  llvm::Value *value = result.getPointer();
2898  value = CGF.Builder.CreateBitCast(value, resultType);
2899  result.setPointer(value);
2900  return result;
2901  }
2902 
2903  TryEmitResult visitLValueToRValue(const Expr *e) {
2904  return tryEmitARCRetainLoadOfScalar(CGF, e);
2905  }
2906 
2907  /// For consumptions, just emit the subexpression and thus elide
2908  /// the retain/release pair.
2909  TryEmitResult visitConsumeObject(const Expr *e) {
2910  llvm::Value *result = CGF.EmitScalarExpr(e);
2911  return TryEmitResult(result, true);
2912  }
2913 
2914  /// Block extends are net +0. Naively, we could just recurse on
2915  /// the subexpression, but actually we need to ensure that the
2916  /// value is copied as a block, so there's a little filter here.
2917  TryEmitResult visitExtendBlockObject(const Expr *e) {
2918  llvm::Value *result; // will be a +0 value
2919 
2920  // If we can't safely assume the sub-expression will produce a
2921  // block-copied value, emit the sub-expression at +0.
2923  result = CGF.EmitScalarExpr(e);
2924 
2925  // Otherwise, try to emit the sub-expression at +1 recursively.
2926  } else {
2927  TryEmitResult subresult = asImpl().visit(e);
2928 
2929  // If that produced a retained value, just use that.
2930  if (subresult.getInt()) {
2931  return subresult;
2932  }
2933 
2934  // Otherwise it's +0.
2935  result = subresult.getPointer();
2936  }
2937 
2938  // Retain the object as a block.
2939  result = CGF.EmitARCRetainBlock(result, /*mandatory*/ true);
2940  return TryEmitResult(result, true);
2941  }
2942 
2943  /// For reclaims, emit the subexpression as a retained call and
2944  /// skip the consumption.
2945  TryEmitResult visitReclaimReturnedObject(const Expr *e) {
2946  llvm::Value *result = emitARCRetainCallResult(CGF, e);
2947  return TryEmitResult(result, true);
2948  }
2949 
2950  /// When we have an undecorated call, retroactively do a claim.
2951  TryEmitResult visitCall(const Expr *e) {
2952  llvm::Value *result = emitARCRetainCallResult(CGF, e);
2953  return TryEmitResult(result, true);
2954  }
2955 
2956  // TODO: maybe special-case visitBinAssignWeak?
2957 
2958  TryEmitResult visitExpr(const Expr *e) {
2959  // We didn't find an obvious production, so emit what we've got and
2960  // tell the caller that we didn't manage to retain.
2961  llvm::Value *result = CGF.EmitScalarExpr(e);
2962  return TryEmitResult(result, false);
2963  }
2964 };
2965 }
2966 
2967 static TryEmitResult
2969  return ARCRetainExprEmitter(CGF).visit(e);
2970 }
2971 
2973  LValue lvalue,
2974  QualType type) {
2975  TryEmitResult result = tryEmitARCRetainLoadOfScalar(CGF, lvalue, type);
2976  llvm::Value *value = result.getPointer();
2977  if (!result.getInt())
2978  value = CGF.EmitARCRetain(type, value);
2979  return value;
2980 }
2981 
2982 /// EmitARCRetainScalarExpr - Semantically equivalent to
2983 /// EmitARCRetainObject(e->getType(), EmitScalarExpr(e)), but making a
2984 /// best-effort attempt to peephole expressions that naturally produce
2985 /// retained objects.
2987  // The retain needs to happen within the full-expression.
2988  if (const ExprWithCleanups *cleanups = dyn_cast<ExprWithCleanups>(e)) {
2989  enterFullExpression(cleanups);
2990  RunCleanupsScope scope(*this);
2991  return EmitARCRetainScalarExpr(cleanups->getSubExpr());
2992  }
2993 
2994  TryEmitResult result = tryEmitARCRetainScalarExpr(*this, e);
2995  llvm::Value *value = result.getPointer();
2996  if (!result.getInt())
2997  value = EmitARCRetain(e->getType(), value);
2998  return value;
2999 }
3000 
3001 llvm::Value *
3003  // The retain needs to happen within the full-expression.
3004  if (const ExprWithCleanups *cleanups = dyn_cast<ExprWithCleanups>(e)) {
3005  enterFullExpression(cleanups);
3006  RunCleanupsScope scope(*this);
3007  return EmitARCRetainAutoreleaseScalarExpr(cleanups->getSubExpr());
3008  }
3009 
3010  TryEmitResult result = tryEmitARCRetainScalarExpr(*this, e);
3011  llvm::Value *value = result.getPointer();
3012  if (result.getInt())
3013  value = EmitARCAutorelease(value);
3014  else
3015  value = EmitARCRetainAutorelease(e->getType(), value);
3016  return value;
3017 }
3018 
3020  llvm::Value *result;
3021  bool doRetain;
3022 
3024  result = EmitScalarExpr(e);
3025  doRetain = true;
3026  } else {
3027  TryEmitResult subresult = tryEmitARCRetainScalarExpr(*this, e);
3028  result = subresult.getPointer();
3029  doRetain = !subresult.getInt();
3030  }
3031 
3032  if (doRetain)
3033  result = EmitARCRetainBlock(result, /*mandatory*/ true);
3034  return EmitObjCConsumeObject(e->getType(), result);
3035 }
3036 
3038  // In ARC, retain and autorelease the expression.
3039  if (getLangOpts().ObjCAutoRefCount) {
3040  // Do so before running any cleanups for the full-expression.
3041  // EmitARCRetainAutoreleaseScalarExpr does this for us.
3043  }
3044 
3045  // Otherwise, use the normal scalar-expression emission. The
3046  // exception machinery doesn't do anything special with the
3047  // exception like retaining it, so there's no safety associated with
3048  // only running cleanups after the throw has started, and when it
3049  // matters it tends to be substantially inferior code.
3050  return EmitScalarExpr(expr);
3051 }
3052 
3053 namespace {
3054 
3055 /// An emitter for assigning into an __unsafe_unretained context.
3056 struct ARCUnsafeUnretainedExprEmitter :
3057  public ARCExprEmitter<ARCUnsafeUnretainedExprEmitter, llvm::Value*> {
3058 
3059  ARCUnsafeUnretainedExprEmitter(CodeGenFunction &CGF) : ARCExprEmitter(CGF) {}
3060 
3061  llvm::Value *getValueOfResult(llvm::Value *value) {
3062  return value;
3063  }
3064 
3065  llvm::Value *emitBitCast(llvm::Value *value, llvm::Type *resultType) {
3066  return CGF.Builder.CreateBitCast(value, resultType);
3067  }
3068 
3069  llvm::Value *visitLValueToRValue(const Expr *e) {
3070  return CGF.EmitScalarExpr(e);
3071  }
3072 
3073  /// For consumptions, just emit the subexpression and perform the
3074  /// consumption like normal.
3075  llvm::Value *visitConsumeObject(const Expr *e) {
3076  llvm::Value *value = CGF.EmitScalarExpr(e);
3077  return CGF.EmitObjCConsumeObject(e->getType(), value);
3078  }
3079 
3080  /// No special logic for block extensions. (This probably can't
3081  /// actually happen in this emitter, though.)
3082  llvm::Value *visitExtendBlockObject(const Expr *e) {
3083  return CGF.EmitARCExtendBlockObject(e);
3084  }
3085 
3086  /// For reclaims, perform an unsafeClaim if that's enabled.
3087  llvm::Value *visitReclaimReturnedObject(const Expr *e) {
3088  return CGF.EmitARCReclaimReturnedObject(e, /*unsafe*/ true);
3089  }
3090 
3091  /// When we have an undecorated call, just emit it without adding
3092  /// the unsafeClaim.
3093  llvm::Value *visitCall(const Expr *e) {
3094  return CGF.EmitScalarExpr(e);
3095  }
3096 
3097  /// Just do normal scalar emission in the default case.
3098  llvm::Value *visitExpr(const Expr *e) {
3099  return CGF.EmitScalarExpr(e);
3100  }
3101 };
3102 }
3103 
3105  const Expr *e) {
3106  return ARCUnsafeUnretainedExprEmitter(CGF).visit(e);
3107 }
3108 
3109 /// EmitARCUnsafeUnretainedScalarExpr - Semantically equivalent to
3110 /// immediately releasing the resut of EmitARCRetainScalarExpr, but
3111 /// avoiding any spurious retains, including by performing reclaims
3112 /// with objc_unsafeClaimAutoreleasedReturnValue.
3114  // Look through full-expressions.
3115  if (const ExprWithCleanups *cleanups = dyn_cast<ExprWithCleanups>(e)) {
3116  enterFullExpression(cleanups);
3117  RunCleanupsScope scope(*this);
3118  return emitARCUnsafeUnretainedScalarExpr(*this, cleanups->getSubExpr());
3119  }
3120 
3121  return emitARCUnsafeUnretainedScalarExpr(*this, e);
3122 }
3123 
3124 std::pair<LValue,llvm::Value*>
3126  bool ignored) {
3127  // Evaluate the RHS first. If we're ignoring the result, assume
3128  // that we can emit at an unsafe +0.
3129  llvm::Value *value;
3130  if (ignored) {
3132  } else {
3133  value = EmitScalarExpr(e->getRHS());
3134  }
3135 
3136  // Emit the LHS and perform the store.
3137  LValue lvalue = EmitLValue(e->getLHS());
3138  EmitStoreOfScalar(value, lvalue);
3139 
3140  return std::pair<LValue,llvm::Value*>(std::move(lvalue), value);
3141 }
3142 
3143 std::pair<LValue,llvm::Value*>
3145  bool ignored) {
3146  // Evaluate the RHS first.
3147  TryEmitResult result = tryEmitARCRetainScalarExpr(*this, e->getRHS());
3148  llvm::Value *value = result.getPointer();
3149 
3150  bool hasImmediateRetain = result.getInt();
3151 
3152  // If we didn't emit a retained object, and the l-value is of block
3153  // type, then we need to emit the block-retain immediately in case
3154  // it invalidates the l-value.
3155  if (!hasImmediateRetain && e->getType()->isBlockPointerType()) {
3156  value = EmitARCRetainBlock(value, /*mandatory*/ false);
3157  hasImmediateRetain = true;
3158  }
3159 
3160  LValue lvalue = EmitLValue(e->getLHS());
3161 
3162  // If the RHS was emitted retained, expand this.
3163  if (hasImmediateRetain) {
3164  llvm::Value *oldValue = EmitLoadOfScalar(lvalue, SourceLocation());
3165  EmitStoreOfScalar(value, lvalue);
3166  EmitARCRelease(oldValue, lvalue.isARCPreciseLifetime());
3167  } else {
3168  value = EmitARCStoreStrong(lvalue, value, ignored);
3169  }
3170 
3171  return std::pair<LValue,llvm::Value*>(lvalue, value);
3172 }
3173 
3174 std::pair<LValue,llvm::Value*>
3177  LValue lvalue = EmitLValue(e->getLHS());
3178 
3179  EmitStoreOfScalar(value, lvalue);
3180 
3181  return std::pair<LValue,llvm::Value*>(lvalue, value);
3182 }
3183 
3185  const ObjCAutoreleasePoolStmt &ARPS) {
3186  const Stmt *subStmt = ARPS.getSubStmt();
3187  const CompoundStmt &S = cast<CompoundStmt>(*subStmt);
3188 
3189  CGDebugInfo *DI = getDebugInfo();
3190  if (DI)
3192 
3193  // Keep track of the current cleanup stack depth.
3194  RunCleanupsScope Scope(*this);
3195  if (CGM.getLangOpts().ObjCRuntime.hasNativeARC()) {
3197  EHStack.pushCleanup<CallObjCAutoreleasePoolObject>(NormalCleanup, token);
3198  } else {
3200  EHStack.pushCleanup<CallObjCMRRAutoreleasePoolObject>(NormalCleanup, token);
3201  }
3202 
3203  for (const auto *I : S.body())
3204  EmitStmt(I);
3205 
3206  if (DI)
3208 }
3209 
3210 /// EmitExtendGCLifetime - Given a pointer to an Objective-C object,
3211 /// make sure it survives garbage collection until this point.
3213  // We just use an inline assembly.
3214  llvm::FunctionType *extenderType
3215  = llvm::FunctionType::get(VoidTy, VoidPtrTy, RequiredArgs::All);
3216  llvm::Value *extender
3217  = llvm::InlineAsm::get(extenderType,
3218  /* assembly */ "",
3219  /* constraints */ "r",
3220  /* side effects */ true);
3221 
3222  object = Builder.CreateBitCast(object, VoidPtrTy);
3223  EmitNounwindRuntimeCall(extender, object);
3224 }
3225 
3226 /// GenerateObjCAtomicSetterCopyHelperFunction - Given a c++ object type with
3227 /// non-trivial copy assignment function, produce following helper function.
3228 /// static void copyHelper(Ty *dest, const Ty *source) { *dest = *source; }
3229 ///
3230 llvm::Constant *
3232  const ObjCPropertyImplDecl *PID) {
3233  if (!getLangOpts().CPlusPlus ||
3235  return nullptr;
3236  QualType Ty = PID->getPropertyIvarDecl()->getType();
3237  if (!Ty->isRecordType())
3238  return nullptr;
3239  const ObjCPropertyDecl *PD = PID->getPropertyDecl();
3241  return nullptr;
3242  llvm::Constant *HelperFn = nullptr;
3243  if (hasTrivialSetExpr(PID))
3244  return nullptr;
3245  assert(PID->getSetterCXXAssignment() && "SetterCXXAssignment - null");
3246  if ((HelperFn = CGM.getAtomicSetterHelperFnMap(Ty)))
3247  return HelperFn;
3248 
3249  ASTContext &C = getContext();
3250  IdentifierInfo *II
3251  = &CGM.getContext().Idents.get("__assign_helper_atomic_property_");
3252 
3253  QualType ReturnTy = C.VoidTy;
3254  QualType DestTy = C.getPointerType(Ty);
3255  QualType SrcTy = Ty;
3256  SrcTy.addConst();
3257  SrcTy = C.getPointerType(SrcTy);
3258 
3259  SmallVector<QualType, 2> ArgTys;
3260  ArgTys.push_back(DestTy);
3261  ArgTys.push_back(SrcTy);
3262  QualType FunctionTy = C.getFunctionType(ReturnTy, ArgTys, {});
3263 
3266  FunctionTy, nullptr, SC_Static, false, false);
3267 
3268  FunctionArgList args;
3269  ImplicitParamDecl DstDecl(C, FD, SourceLocation(), /*Id=*/nullptr, DestTy,
3271  args.push_back(&DstDecl);
3272  ImplicitParamDecl SrcDecl(C, FD, SourceLocation(), /*Id=*/nullptr, SrcTy,
3274  args.push_back(&SrcDecl);
3275 
3276  const CGFunctionInfo &FI =
3277  CGM.getTypes().arrangeBuiltinFunctionDeclaration(ReturnTy, args);
3278 
3279  llvm::FunctionType *LTy = CGM.getTypes().GetFunctionType(FI);
3280 
3281  llvm::Function *Fn =
3283  "__assign_helper_atomic_property_",
3284  &CGM.getModule());
3285 
3287 
3288  StartFunction(FD, ReturnTy, Fn, FI, args);
3289 
3290  DeclRefExpr DstExpr(&DstDecl, false, DestTy,
3292  UnaryOperator DST(&DstExpr, UO_Deref, DestTy->getPointeeType(),
3293  VK_LValue, OK_Ordinary, SourceLocation(), false);
3294 
3295  DeclRefExpr SrcExpr(&SrcDecl, false, SrcTy,
3297  UnaryOperator SRC(&SrcExpr, UO_Deref, SrcTy->getPointeeType(),
3298  VK_LValue, OK_Ordinary, SourceLocation(), false);
3299 
3300  Expr *Args[2] = { &DST, &SRC };
3301  CallExpr *CalleeExp = cast<CallExpr>(PID->getSetterCXXAssignment());
3302  CXXOperatorCallExpr TheCall(C, OO_Equal, CalleeExp->getCallee(),
3303  Args, DestTy->getPointeeType(),
3305 
3306  EmitStmt(&TheCall);
3307 
3308  FinishFunction();
3309  HelperFn = llvm::ConstantExpr::getBitCast(Fn, VoidPtrTy);
3310  CGM.setAtomicSetterHelperFnMap(Ty, HelperFn);
3311  return HelperFn;
3312 }
3313 
3314 llvm::Constant *
3316  const ObjCPropertyImplDecl *PID) {
3317  if (!getLangOpts().CPlusPlus ||
3319  return nullptr;
3320  const ObjCPropertyDecl *PD = PID->getPropertyDecl();
3321  QualType Ty = PD->getType();
3322  if (!Ty->isRecordType())
3323  return nullptr;
3325  return nullptr;
3326  llvm::Constant *HelperFn = nullptr;
3327  if (hasTrivialGetExpr(PID))
3328  return nullptr;
3329  assert(PID->getGetterCXXConstructor() && "getGetterCXXConstructor - null");
3330  if ((HelperFn = CGM.getAtomicGetterHelperFnMap(Ty)))
3331  return HelperFn;
3332 
3333  ASTContext &C = getContext();
3334  IdentifierInfo *II =
3335  &CGM.getContext().Idents.get("__copy_helper_atomic_property_");
3336 
3337  QualType ReturnTy = C.VoidTy;
3338  QualType DestTy = C.getPointerType(Ty);
3339  QualType SrcTy = Ty;
3340  SrcTy.addConst();
3341  SrcTy = C.getPointerType(SrcTy);
3342 
3343  SmallVector<QualType, 2> ArgTys;
3344  ArgTys.push_back(DestTy);
3345  ArgTys.push_back(SrcTy);
3346  QualType FunctionTy = C.getFunctionType(ReturnTy, ArgTys, {});
3347 
3350  FunctionTy, nullptr, SC_Static, false, false);
3351 
3352  FunctionArgList args;
3353  ImplicitParamDecl DstDecl(C, FD, SourceLocation(), /*Id=*/nullptr, DestTy,
3355  args.push_back(&DstDecl);
3356  ImplicitParamDecl SrcDecl(C, FD, SourceLocation(), /*Id=*/nullptr, SrcTy,
3358  args.push_back(&SrcDecl);
3359 
3360  const CGFunctionInfo &FI =
3361  CGM.getTypes().arrangeBuiltinFunctionDeclaration(ReturnTy, args);
3362 
3363  llvm::FunctionType *LTy = CGM.getTypes().GetFunctionType(FI);
3364 
3365  llvm::Function *Fn = llvm::Function::Create(
3366  LTy, llvm::GlobalValue::InternalLinkage, "__copy_helper_atomic_property_",
3367  &CGM.getModule());
3368 
3370 
3371  StartFunction(FD, ReturnTy, Fn, FI, args);
3372 
3373  DeclRefExpr SrcExpr(&SrcDecl, false, SrcTy,
3375 
3376  UnaryOperator SRC(&SrcExpr, UO_Deref, SrcTy->getPointeeType(),
3377  VK_LValue, OK_Ordinary, SourceLocation(), false);
3378 
3379  CXXConstructExpr *CXXConstExpr =
3380  cast<CXXConstructExpr>(PID->getGetterCXXConstructor());
3381 
3382  SmallVector<Expr*, 4> ConstructorArgs;
3383  ConstructorArgs.push_back(&SRC);
3384  ConstructorArgs.append(std::next(CXXConstExpr->arg_begin()),
3385  CXXConstExpr->arg_end());
3386 
3387  CXXConstructExpr *TheCXXConstructExpr =
3389  CXXConstExpr->getConstructor(),
3390  CXXConstExpr->isElidable(),
3391  ConstructorArgs,
3392  CXXConstExpr->hadMultipleCandidates(),
3393  CXXConstExpr->isListInitialization(),
3394  CXXConstExpr->isStdInitListInitialization(),
3395  CXXConstExpr->requiresZeroInitialization(),
3396  CXXConstExpr->getConstructionKind(),
3397  SourceRange());
3398 
3399  DeclRefExpr DstExpr(&DstDecl, false, DestTy,
3401 
3402  RValue DV = EmitAnyExpr(&DstExpr);
3403  CharUnits Alignment
3404  = getContext().getTypeAlignInChars(TheCXXConstructExpr->getType());
3405  EmitAggExpr(TheCXXConstructExpr,
3406  AggValueSlot::forAddr(Address(DV.getScalarVal(), Alignment),
3407  Qualifiers(),
3412 
3413  FinishFunction();
3414  HelperFn = llvm::ConstantExpr::getBitCast(Fn, VoidPtrTy);
3415  CGM.setAtomicGetterHelperFnMap(Ty, HelperFn);
3416  return HelperFn;
3417 }
3418 
3419 llvm::Value *
3421  // Get selectors for retain/autorelease.
3422  IdentifierInfo *CopyID = &getContext().Idents.get("copy");
3423  Selector CopySelector =
3425  IdentifierInfo *AutoreleaseID = &getContext().Idents.get("autorelease");
3426  Selector AutoreleaseSelector =
3427  getContext().Selectors.getNullarySelector(AutoreleaseID);
3428 
3429  // Emit calls to retain/autorelease.
3430  CGObjCRuntime &Runtime = CGM.getObjCRuntime();
3431  llvm::Value *Val = Block;
3432  RValue Result;
3433  Result = Runtime.GenerateMessageSend(*this, ReturnValueSlot(),
3434  Ty, CopySelector,
3435  Val, CallArgList(), nullptr, nullptr);
3436  Val = Result.getScalarVal();
3437  Result = Runtime.GenerateMessageSend(*this, ReturnValueSlot(),
3438  Ty, AutoreleaseSelector,
3439  Val, CallArgList(), nullptr, nullptr);
3440  Val = Result.getScalarVal();
3441  return Val;
3442 }
3443 
3444 llvm::Value *
3446  assert(Args.size() == 3 && "Expected 3 argument here!");
3447 
3448  if (!CGM.IsOSVersionAtLeastFn) {
3449  llvm::FunctionType *FTy =
3450  llvm::FunctionType::get(Int32Ty, {Int32Ty, Int32Ty, Int32Ty}, false);
3451  CGM.IsOSVersionAtLeastFn =
3452  CGM.CreateRuntimeFunction(FTy, "__isOSVersionAtLeast");
3453  }
3454 
3455  llvm::Value *CallRes =
3457 
3458  return Builder.CreateICmpNE(CallRes, llvm::Constant::getNullValue(Int32Ty));
3459 }
3460 
3461 void CodeGenModule::emitAtAvailableLinkGuard() {
3462  if (!IsOSVersionAtLeastFn)
3463  return;
3464  // @available requires CoreFoundation only on Darwin.
3465  if (!Target.getTriple().isOSDarwin())
3466  return;
3467  // Add -framework CoreFoundation to the linker commands. We still want to
3468  // emit the core foundation reference down below because otherwise if
3469  // CoreFoundation is not used in the code, the linker won't link the
3470  // framework.
3471  auto &Context = getLLVMContext();
3472  llvm::Metadata *Args[2] = {llvm::MDString::get(Context, "-framework"),
3473  llvm::MDString::get(Context, "CoreFoundation")};
3474  LinkerOptionsMetadata.push_back(llvm::MDNode::get(Context, Args));
3475  // Emit a reference to a symbol from CoreFoundation to ensure that
3476  // CoreFoundation is linked into the final binary.
3477  llvm::FunctionType *FTy =
3478  llvm::FunctionType::get(Int32Ty, {VoidPtrTy}, false);
3479  llvm::Constant *CFFunc =
3480  CreateRuntimeFunction(FTy, "CFBundleGetVersionNumber");
3481 
3482  llvm::FunctionType *CheckFTy = llvm::FunctionType::get(VoidTy, {}, false);
3483  llvm::Function *CFLinkCheckFunc = cast<llvm::Function>(CreateBuiltinFunction(
3484  CheckFTy, "__clang_at_available_requires_core_foundation_framework"));
3485  CFLinkCheckFunc->setLinkage(llvm::GlobalValue::LinkOnceAnyLinkage);
3486  CFLinkCheckFunc->setVisibility(llvm::GlobalValue::HiddenVisibility);
3487  CodeGenFunction CGF(*this);
3488  CGF.Builder.SetInsertPoint(CGF.createBasicBlock("", CFLinkCheckFunc));
3489  CGF.EmitNounwindRuntimeCall(CFFunc, llvm::Constant::getNullValue(VoidPtrTy));
3490  CGF.Builder.CreateUnreachable();
3491  addCompilerUsedGlobal(CFLinkCheckFunc);
3492 }
3493 
const CGFunctionInfo & arrangeBuiltinFunctionDeclaration(QualType resultType, const FunctionArgList &args)
A builtin function is a freestanding function using the default C conventions.
Definition: CGCall.cpp:653
const llvm::DataLayout & getDataLayout() const
A call to an overloaded operator written using operator syntax.
Definition: ExprCXX.h:78
The receiver is the instance of the superclass object.
Definition: ExprObjC.h:1061
ReturnValueSlot - Contains the address where the return value of a function can be stored...
Definition: CGCall.h:361
const internal::VariadicAllOfMatcher< Type > type
Matches Types in the clang AST.
static bool UseOptimizedSetter(CodeGenModule &CGM)
Definition: CGObjC.cpp:1159
SourceLocation getRBracLoc() const
Definition: Stmt.h:896
Defines the clang::ASTContext interface.
bool isClassMethod() const
Definition: DeclObjC.h:422
Represents a function declaration or definition.
Definition: Decl.h:1732
llvm::Value * EmitARCStoreStrong(LValue lvalue, llvm::Value *value, bool resultIgnored)
Store into a strong object.
Definition: CGObjC.cpp:2145
The receiver is an object instance.
Definition: ExprObjC.h:1055
llvm::Value * EmitARCReclaimReturnedObject(const Expr *e, bool allowUnsafeClaim)
Definition: CGObjC.cpp:2600
Other implicit parameter.
Definition: Decl.h:1511
static llvm::Value * emitARCRetainCallResult(CodeGenFunction &CGF, const Expr *e)
Given that the given expression is some sort of call (which does not return retained), emit a retain following it.
Definition: CGObjC.cpp:2574
ObjCDictionaryElement getKeyValueElement(unsigned Index) const
Definition: ExprObjC.h:344
Smart pointer class that efficiently represents Objective-C method names.
QualType getObjCIdType() const
Represents the Objective-CC id type.
Definition: ASTContext.h:1858
llvm::Value * EmitARCRetainAutoreleaseScalarExpr(const Expr *expr)
Definition: CGObjC.cpp:3002
static bool hasTrivialGetExpr(const ObjCPropertyImplDecl *propImpl)
Definition: CGObjC.cpp:824
CanQualType VoidPtrTy
Definition: ASTContext.h:1053
Destroyer * getDestroyer(QualType::DestructionKind destructionKind)
Definition: CGDecl.cpp:1656
A (possibly-)qualified type.
Definition: Type.h:642
bool isBlockPointerType() const
Definition: Type.h:6290
static bool hasUnalignedAtomics(llvm::Triple::ArchType arch)
Determine whether the given architecture supports unaligned atomic accesses.
Definition: CGObjC.cpp:615
void EmitExtendGCLifetime(llvm::Value *object)
EmitExtendGCLifetime - Given a pointer to an Objective-C object, make sure it survives garbage collec...
Definition: CGObjC.cpp:3212
const CodeGenOptions & getCodeGenOpts() const
Selector getSelector() const
Definition: ExprObjC.cpp:312
llvm::Value * EmitARCExtendBlockObject(const Expr *expr)
Definition: CGObjC.cpp:3019
ObjCInterfaceDecl * getClassInterface()
Definition: DeclObjC.cpp:1144
virtual llvm::Function * GenerateMethod(const ObjCMethodDecl *OMD, const ObjCContainerDecl *CD)=0
Generate a function preamble for a method with the specified types.
Address CreateMemTemp(QualType T, const Twine &Name="tmp", Address *Alloca=nullptr)
CreateMemTemp - Create a temporary memory object of the given type, with appropriate alignmen and cas...
Definition: CGExpr.cpp:139
void enterFullExpression(const FullExpr *E)
ObjCIvarDecl * getPropertyIvarDecl() const
Definition: DeclObjC.h:2819
void EmitARCDestroyWeak(Address addr)
void @objc_destroyWeak(i8** addr) Essentially objc_storeWeak(addr, nil).
Definition: CGObjC.cpp:2281
ObjCProtocolDecl * getProtocol() const
Definition: ExprObjC.h:490
Stmt - This represents one statement.
Definition: Stmt.h:66
virtual CodeGen::RValue GenerateMessageSend(CodeGen::CodeGenFunction &CGF, ReturnValueSlot ReturnSlot, QualType ResultType, Selector Sel, llvm::Value *Receiver, const CallArgList &CallArgs, const ObjCInterfaceDecl *Class=nullptr, const ObjCMethodDecl *Method=nullptr)=0
Generate an Objective-C message send operation.
void EmitLexicalBlockEnd(CGBuilderTy &Builder, SourceLocation Loc)
Emit metadata to indicate the end of a new lexical block and pop the current block.
QualType getPointeeType() const
If this is a pointer, ObjC object pointer, or block pointer, this returns the respective pointee...
Definition: Type.cpp:497
const llvm::Triple & getTriple() const
Returns the target triple of the primary target.
Definition: TargetInfo.h:949
bool requiresCleanups() const
Determine whether this scope requires any cleanups.
Implements runtime-specific code generation functions.
Definition: CGObjCRuntime.h:64
void addConst()
Add the const type qualifier to this QualType.
Definition: Type.h:811
bool isRecordType() const
Definition: Type.h:6355
static RValue AdjustObjCObjectType(CodeGenFunction &CGF, QualType ET, RValue Result)
Adjust the type of an Objective-C object that doesn&#39;t match up due to type erasure at various points...
Definition: CGObjC.cpp:265
llvm::Constant * objc_autoreleaseReturnValue
id objc_autoreleaseReturnValue(id);
const Decl * CurCodeDecl
CurCodeDecl - This is the inner-most code context, which includes blocks.
Opcode getOpcode() const
Definition: Expr.h:3239
QualType getNonReferenceType() const
If Type is a reference type (e.g., const int&), returns the type that the reference refers to ("const...
Definition: Type.h:6231
Expr * getSetterCXXAssignment() const
Definition: DeclObjC.h:2849
static Destroyer destroyARCStrongPrecise
Represents Objective-C&#39;s @throw statement.
Definition: StmtObjC.h:313
void EmitStoreThroughLValue(RValue Src, LValue Dst, bool isInit=false)
EmitStoreThroughLValue - Store the specified rvalue into the specified lvalue, where both are guarant...
Definition: CGExpr.cpp:1910
void GenerateObjCSetter(ObjCImplementationDecl *IMP, const ObjCPropertyImplDecl *PID)
GenerateObjCSetter - Synthesize an Objective-C property setter function for the given property...
Definition: CGObjC.cpp:1344
Represents a call to a C++ constructor.
Definition: ExprCXX.h:1262
const ObjCObjectPointerType * getAsObjCInterfacePointerType() const
Definition: Type.cpp:1582
bool isZero() const
isZero - Test whether the quantity equals zero.
Definition: CharUnits.h:116
QualType withConst() const
Definition: Type.h:814
llvm::Constant * objc_loadWeakRetained
id objc_loadWeakRetained(id*);
The l-value was an access to a declared entity or something equivalently strong, like the address of ...
void EmitARCCopyWeak(Address dst, Address src)
void @objc_copyWeak(i8** dest, i8** src) Disregards the current value in dest.
Definition: CGObjC.cpp:2307
llvm::Value * EmitObjCMRRAutoreleasePoolPush()
Produce the code to do an MRR version objc_autoreleasepool_push.
Definition: CGObjC.cpp:2365
Floating point control options.
Definition: LangOptions.h:299
llvm::Constant * GenerateObjCAtomicSetterCopyHelperFunction(const ObjCPropertyImplDecl *PID)
GenerateObjCAtomicSetterCopyHelperFunction - Given a c++ object type with non-trivial copy assignment...
Definition: CGObjC.cpp:3231
llvm::Value * EmitARCRetainNonBlock(llvm::Value *value)
Retain the given object, with normal retain semantics.
Definition: CGObjC.cpp:1966
static llvm::Value * emitARCRetainLoadOfScalar(CodeGenFunction &CGF, LValue lvalue, QualType type)
Definition: CGObjC.cpp:2972
param_const_iterator param_end() const
Definition: DeclObjC.h:352
void createImplicitParams(ASTContext &Context, const ObjCInterfaceDecl *ID)
createImplicitParams - Used to lazily create the self and cmd implict parameters. ...
Definition: DeclObjC.cpp:1123
llvm::function_ref< llvm::Value *(CodeGenFunction &CGF, llvm::Value *value)> ValueTransform
Definition: CGObjC.cpp:2528
Address GetAddrOfLocalVar(const VarDecl *VD)
GetAddrOfLocalVar - Return the address of a local variable.
RValue EmitCall(const CGFunctionInfo &CallInfo, const CGCallee &Callee, ReturnValueSlot ReturnValue, const CallArgList &Args, llvm::Instruction **callOrInvoke, SourceLocation Loc)
EmitCall - Generate a call of the given function, expecting the given result type, and using the given argument list which specifies both the LLVM arguments and the types they were derived from.
Definition: CGCall.cpp:3787
Represents a variable declaration or definition.
Definition: Decl.h:812
Objects with "hidden" visibility are not seen by the dynamic linker.
Definition: Visibility.h:37
const internal::VariadicDynCastAllOfMatcher< Stmt, Expr > expr
Matches expressions.
const T * getAs() const
Member-template getAs<specific type>&#39;.
Definition: Type.h:6716
bool hasPointerRepresentation() const
Whether this type is represented natively as a pointer.
Definition: Type.h:6665
virtual StringRef getARCRetainAutoreleasedReturnValueMarker() const
Retrieve the address of a function to call immediately before calling objc_retainAutoreleasedReturnVa...
Definition: TargetInfo.h:156
uint64_t getProfileCount(const Stmt *S)
Get the profiler&#39;s count for the given statement.
llvm::Value * EmitObjCAutoreleasePoolPush()
Produce the code to do a objc_autoreleasepool_push.
Definition: CGObjC.cpp:2330
This class gathers all debug information during compilation and is responsible for emitting to llvm g...
Definition: CGDebugInfo.h:54
ObjCMethodDecl - Represents an instance or class method declaration.
Definition: DeclObjC.h:139
llvm::Value * EmitBlockCopyAndAutorelease(llvm::Value *Block, QualType Ty)
Definition: CGObjC.cpp:3420
llvm::Value * getPointer() const
Definition: Address.h:38
llvm::Constant * getAtomicSetterHelperFnMap(QualType Ty)
Defines the Objective-C statement AST node classes.
static bool shouldRetainObjCLifetime(Qualifiers::ObjCLifetime lifetime)
Definition: CGObjC.cpp:2450
Represents an expression – generally a full-expression – that introduces cleanups to be run at the ...
Definition: ExprCXX.h:3033
Represents a parameter to a function.
Definition: Decl.h:1551
llvm::Value * EmitObjCDictionaryLiteral(const ObjCDictionaryLiteral *E)
Definition: CGObjC.cpp:243
The collection of all-type qualifiers we support.
Definition: Type.h:141
virtual llvm::Constant * GetOptimizedPropertySetFunction(bool atomic, bool copy)=0
Return the runtime function for optimized setting properties.
void add(RValue rvalue, QualType type)
Definition: CGCall.h:285
A jump destination is an abstract label, branching to which may require a jump out through normal cle...
bool isARCPseudoStrong() const
Determine whether this variable is an ARC pseudo-__strong variable.
Definition: Decl.h:1356
llvm::Value * EmitObjCThrowOperand(const Expr *expr)
Definition: CGObjC.cpp:3037
bool isXValue() const
Definition: Expr.h:251
const Stmt * getSubStmt() const
Definition: StmtObjC.h:356
const AstTypeMatcher< RecordType > recordType
Matches record types (e.g.
llvm::Constant * objc_autorelease
id objc_autorelease(id);
llvm::Constant * objc_copyWeak
void objc_copyWeak(id *dest, id *src);
llvm::Constant * getAtomicGetterHelperFnMap(QualType Ty)
One of these records is kept for each identifier that is lexed.
void emitDestroy(Address addr, QualType type, Destroyer *destroyer, bool useEHCleanupForArray)
emitDestroy - Immediately perform the destruction of the given object.
Definition: CGDecl.cpp:1731
Address getAddress() const
Definition: CGValue.h:327
bool isStr(const char(&Str)[StrLen]) const
Return true if this is the identifier for the specified string.
Expr * getGetterCXXConstructor() const
Definition: DeclObjC.h:2841
static void emitStructGetterCall(CodeGenFunction &CGF, ObjCIvarDecl *ivar, bool isAtomic, bool hasStrong)
emitStructGetterCall - Call the runtime function to load a property into the return value slot...
Definition: CGObjC.cpp:583
Represents a class type in Objective C.
Definition: Type.h:5524
llvm::Constant * objc_loadWeak
id objc_loadWeak(id*);
CodeGenFunction - This class organizes the per-function state that is used while generating LLVM code...
llvm::Type * ConvertType(QualType T)
ConvertType - Convert type T into a llvm::Type.
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:154
const ParmVarDecl *const * param_const_iterator
Definition: DeclObjC.h:343
std::pair< LValue, llvm::Value * > EmitARCStoreAutoreleasing(const BinaryOperator *e)
Definition: CGObjC.cpp:3175
llvm::Constant * objc_retainAutoreleasedReturnValue
id objc_retainAutoreleasedReturnValue(id);
llvm::Value * EmitObjCExtendObjectLifetime(QualType T, llvm::Value *Ptr)
Definition: CGObjC.cpp:1800
bool hasOptimizedSetter() const
Does this runtime supports optimized setter entrypoints?
Definition: ObjCRuntime.h:177
static CXXConstructExpr * Create(const ASTContext &C, QualType T, SourceLocation Loc, CXXConstructorDecl *Ctor, bool Elidable, ArrayRef< Expr *> Args, bool HadMultipleCandidates, bool ListInitialization, bool StdInitListInitialization, bool ZeroInitialization, ConstructionKind ConstructKind, SourceRange ParenOrBraceRange)
Definition: ExprCXX.cpp:806
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Stmt.cpp:280
SetterKind getSetterKind() const
getSetterKind - Return the method used for doing assignment in the property setter.
Definition: DeclObjC.h:886
llvm::Value * EmitARCRetainAutoreleaseReturnValue(llvm::Value *value)
Do a fused retain/autorelease of the given object.
Definition: CGObjC.cpp:2199
Represents a member of a struct/union/class.
Definition: Decl.h:2575
CharUnits getAlignment() const
Definition: CGValue.h:316
StringLiteral * getString()
Definition: ExprObjC.h:63
bool isReferenceType() const
Definition: Type.h:6294
ObjCMethodDecl * getSetterMethodDecl() const
Definition: DeclObjC.h:917
Denotes a cleanup that should run when a scope is exited using exceptional control flow (a throw stat...
Definition: EHScopeStack.h:81
Token - This structure provides full information about a lexed token.
Definition: Token.h:35
llvm::Value * EmitARCAutoreleaseReturnValue(llvm::Value *value)
Autorelease the given object.
Definition: CGObjC.cpp:2189
static AggValueSlot forAddr(Address addr, Qualifiers quals, IsDestructed_t isDestructed, NeedsGCBarriers_t needsGC, IsAliased_t isAliased, Overlap_t mayOverlap, IsZeroed_t isZeroed=IsNotZeroed, IsSanitizerChecked_t isChecked=IsNotSanitizerChecked)
forAddr - Make a slot for an aggregate value.
Definition: CGValue.h:514
void GenerateObjCCtorDtorMethod(ObjCImplementationDecl *IMP, ObjCMethodDecl *MD, bool ctor)
Definition: CGObjC.cpp:1425
Expr * getSubExpr()
Definition: Expr.h:2947
virtual llvm::Constant * GetPropertySetFunction()=0
Return the runtime function for setting properties.
CleanupKind getCleanupKind(QualType::DestructionKind kind)
ObjCArrayLiteral - used for objective-c array containers; as in: @["Hello", NSApp, [NSNumber numberWithInt:42]];.
Definition: ExprObjC.h:171
llvm::Value * EmitObjCBoxedExpr(const ObjCBoxedExpr *E)
EmitObjCBoxedExpr - This routine generates code to call the appropriate expression boxing method...
Definition: CGObjC.cpp:60
IdentifierTable & Idents
Definition: ASTContext.h:565
An r-value expression (a pr-value in the C++11 taxonomy) produces a temporary value.
Definition: Specifiers.h:110
Selector getSelector() const
Definition: ExprObjC.h:442
void EmitStoreOfScalar(llvm::Value *Value, Address Addr, bool Volatile, QualType Ty, AlignmentSource Source=AlignmentSource::Type, bool isInit=false, bool isNontemporal=false)
EmitStoreOfScalar - Store a scalar value to an address, taking care to appropriately convert from the...
ComplexPairTy EmitLoadOfComplex(LValue src, SourceLocation loc)
EmitLoadOfComplex - Load a complex number from the specified l-value.
const Expr *const * const_semantics_iterator
Definition: Expr.h:5259
bool isUnarySelector() const
virtual CodeGen::RValue GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF, ReturnValueSlot ReturnSlot, QualType ResultType, Selector Sel, const ObjCInterfaceDecl *Class, bool isCategoryImpl, llvm::Value *Self, bool IsClassMessage, const CallArgList &CallArgs, const ObjCMethodDecl *Method=nullptr)=0
Generate an Objective-C message send operation to the super class initiated in a method for Class and...
RValue EmitAnyExpr(const Expr *E, AggValueSlot aggSlot=AggValueSlot::ignored(), bool ignoreResult=false)
EmitAnyExpr - Emit code to compute the specified expression which can have any type.
Definition: CGExpr.cpp:194
bool isGLValue() const
Definition: Expr.h:252
ObjCMethodFamily getMethodFamily() const
Determines the family of this method.
Definition: DeclObjC.cpp:986
llvm::Value * EmitARCStoreStrongCall(Address addr, llvm::Value *value, bool resultIgnored)
Store into a strong object.
Definition: CGObjC.cpp:2119
ARCPreciseLifetime_t isARCPreciseLifetime() const
Definition: CGValue.h:285
llvm::Constant * objc_initWeak
id objc_initWeak(id*, id);
llvm::Value * EmitObjCStringLiteral(const ObjCStringLiteral *E)
Emits an instance of NSConstantString representing the object.
Definition: CGObjC.cpp:46
bool isBitField() const
Determines whether this field is a bitfield.
Definition: Decl.h:2653
Selector getNullarySelector(IdentifierInfo *ID)
ObjCContainerDecl - Represents a container for method declarations.
Definition: DeclObjC.h:961
Address CreateElementBitCast(Address Addr, llvm::Type *Ty, const llvm::Twine &Name="")
Cast the element type of the given address to a different type, preserving information like the align...
Definition: CGBuilder.h:157
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:38
void EmitARCDestroyStrong(Address addr, ARCPreciseLifetime_t precise)
Destroy a __strong variable.
Definition: CGObjC.cpp:2105
static llvm::Value * emitARCUnsafeClaimCallResult(CodeGenFunction &CGF, const Expr *e)
Given that the given expression is some sort of call (which does not return retained), perform an unsafeClaim following it.
Definition: CGObjC.cpp:2588
Qualifiers::GC getObjCGCAttrKind(QualType Ty) const
Return one of the GCNone, Weak or Strong Objective-C garbage collection attributes.
SourceLocation getLBracLoc() const
Definition: Stmt.h:895
PropertyAttributeKind getPropertyAttributes() const
Definition: DeclObjC.h:832
semantics_iterator semantics_end()
Definition: Expr.h:5266
llvm::Constant * objc_release
void objc_release(id);
A builtin binary operation expression such as "x + y" or "x <= y".
Definition: Expr.h:3198
bool isVolatileQualified() const
Determine whether this type is volatile-qualified.
Definition: Type.h:6128
llvm::Value * EmitARCUnsafeUnretainedScalarExpr(const Expr *expr)
EmitARCUnsafeUnretainedScalarExpr - Semantically equivalent to immediately releasing the resut of Emi...
Definition: CGObjC.cpp:3113
void setAtomicGetterHelperFnMap(QualType Ty, llvm::Constant *Fn)
Defines the Diagnostic-related interfaces.
llvm::Value * EmitARCLoadWeak(Address addr)
i8* @objc_loadWeak(i8** addr) Essentially objc_autorelease(objc_loadWeakRetained(addr)).
Definition: CGObjC.cpp:2236
ObjCStringLiteral, used for Objective-C string literals i.e.
Definition: ExprObjC.h:51
Scope - A scope is a transient data structure that is used while parsing the program.
Definition: Scope.h:40
llvm::BasicBlock * createBasicBlock(const Twine &name="", llvm::Function *parent=nullptr, llvm::BasicBlock *before=nullptr)
createBasicBlock - Create an LLVM basic block.
llvm::Value * EmitARCRetainScalarExpr(const Expr *expr)
EmitARCRetainScalarExpr - Semantically equivalent to EmitARCRetainObject(e->getType(), EmitScalarExpr(e)), but making a best-effort attempt to peephole expressions that naturally produce retained objects.
Definition: CGObjC.cpp:2986
void EmitIgnoredExpr(const Expr *E)
EmitIgnoredExpr - Emit an expression in a context which ignores the result.
Definition: CGExpr.cpp:182
static bool shouldEmitSeparateBlockRetain(const Expr *e)
Determine whether it might be important to emit a separate objc_retain_block on the result of the giv...
Definition: CGObjC.cpp:2614
Denotes a cleanup that should run when a scope is exited using normal control flow (falling off the e...
Definition: EHScopeStack.h:85
CastExpr - Base class for type casts, including both implicit casts (ImplicitCastExpr) and explicit c...
Definition: Expr.h:2882
void ForceCleanup(std::initializer_list< llvm::Value **> ValuesToReload={})
Force the emission of cleanups now, instead of waiting until this object is destroyed.
llvm::Constant * CreateRuntimeVariable(llvm::Type *Ty, StringRef Name)
Create a new runtime global variable with the specified type and name.
Expr * Key
The key for the dictionary element.
Definition: ExprObjC.h:241
ObjCMethodDecl * getArrayWithObjectsMethod() const
Definition: ExprObjC.h:222
virtual llvm::Constant * GetGetStructFunction()=0
GlobalDecl CurGD
CurGD - The GlobalDecl for the current function being compiled.
An ordinary object is located at an address in memory.
Definition: Specifiers.h:126
void incrementProfileCounter(const Stmt *S, llvm::Value *StepV=nullptr)
Increment the profiler&#39;s counter for the given statement by StepV.
uint64_t getCurrentProfileCount()
Get the profiler&#39;s current count.
Represents an ObjC class declaration.
Definition: DeclObjC.h:1164
QualType getReturnType() const
Definition: DeclObjC.h:323
ObjCInterfaceDecl * getInterface() const
Gets the interface declaration for this object type, if the base type really is an interface...
Definition: Type.h:5759
static llvm::Constant * createARCRuntimeFunction(CodeGenModule &CGM, llvm::FunctionType *FTy, StringRef Name)
Definition: CGObjC.cpp:1821
static TryEmitResult tryEmitARCRetainScalarExpr(CodeGenFunction &CGF, const Expr *e)
Definition: CGObjC.cpp:2968
bool isAtomic() const
isAtomic - Return true if the property is atomic.
Definition: DeclObjC.h:860
llvm::Value * EmitARCRetainAutoreleasedReturnValue(llvm::Value *value)
Retain the given object which is the result of a function call.
Definition: CGObjC.cpp:2049
static FunctionDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, SourceLocation NLoc, DeclarationName N, QualType T, TypeSourceInfo *TInfo, StorageClass SC, bool isInlineSpecified=false, bool hasWrittenPrototype=true, bool isConstexprSpecified=false)
Definition: Decl.h:1869
llvm::Value * EmitARCRetainAutoreleaseNonBlock(llvm::Value *value)
Do a fused retain/autorelease of the given object.
Definition: CGObjC.cpp:2228
This object can be modified without requiring retains or releases.
Definition: Type.h:162
ObjCMethodDecl * getDictWithObjectsMethod() const
Definition: ExprObjC.h:358
llvm::Constant * CreateRuntimeFunction(llvm::FunctionType *Ty, StringRef Name, llvm::AttributeList ExtraAttrs=llvm::AttributeList(), bool Local=false)
Create a new runtime function with the specified type and name.
llvm::Value * EmitLoadOfScalar(Address Addr, bool Volatile, QualType Ty, SourceLocation Loc, AlignmentSource Source=AlignmentSource::Type, bool isNontemporal=false)
EmitLoadOfScalar - Load a scalar value from an address, taking care to appropriately convert from the...
ObjCPropertyImplDecl - Represents implementation declaration of a property in a class or category imp...
Definition: DeclObjC.h:2751
RValue EmitObjCMessageExpr(const ObjCMessageExpr *E, ReturnValueSlot Return=ReturnValueSlot())
Definition: CGObjC.cpp:355
bool hasAttr() const
Definition: DeclBase.h:531
CompoundStmt - This represents a group of statements like { stmt stmt }.
Definition: Stmt.h:803
AutoVarEmission EmitAutoVarAlloca(const VarDecl &var)
EmitAutoVarAlloca - Emit the alloca and debug information for a local variable.
Definition: CGDecl.cpp:1127
std::pair< llvm::Value *, llvm::Value * > ComplexPairTy
llvm::CallInst * EmitNounwindRuntimeCall(llvm::Value *callee, const Twine &name="")
const TargetCodeGenInfo & getTargetCodeGenInfo()
void EmitAnyExprToMem(const Expr *E, Address Location, Qualifiers Quals, bool IsInitializer)
EmitAnyExprToMem - Emits the code necessary to evaluate an arbitrary expression into the given memory...
Definition: CGExpr.cpp:223
llvm::Constant * objc_storeStrong
void objc_storeStrong(id*, id);
CastKind
CastKind - The kind of operation required for a conversion.
RValue - This trivial value class is used to represent the result of an expression that is evaluated...
Definition: CGValue.h:39
CleanupKind getARCCleanupKind()
Retrieves the default cleanup kind for an ARC cleanup.
SourceLocation getEndLoc() const LLVM_READONLY
Definition: DeclObjC.cpp:980
llvm::Value * emitScalarConstant(const ConstantEmission &Constant, Expr *E)
Definition: CGExpr.cpp:1496
llvm::Value * EmitARCStoreWeak(Address addr, llvm::Value *value, bool ignored)
i8* @objc_storeWeak(i8** addr, i8* value) Returns value.
Definition: CGObjC.cpp:2251
static TypeEvaluationKind getEvaluationKind(QualType T)
getEvaluationKind - Return the TypeEvaluationKind of QualType T.
CGObjCRuntime & getObjCRuntime()
Return a reference to the configured Objective-C runtime.
ObjCMethodDecl * getBoxingMethod() const
Definition: ExprObjC.h:138
static bool shouldExtendReceiverForInnerPointerMessage(const ObjCMessageExpr *message)
Decide whether to extend the lifetime of the receiver of a returns-inner-pointer message.
Definition: CGObjC.cpp:283
Represent the declaration of a variable (in which case it is an lvalue) a function (in which case it ...
Definition: Decl.h:636
This represents one expression.
Definition: Expr.h:106
bool hasAtomicCopyHelper() const
Definition: ObjCRuntime.h:299
llvm::Constant * objc_autoreleasePoolPop
void objc_autoreleasePoolPop(void*);
void EmitARCMoveWeak(Address dst, Address src)
void @objc_moveWeak(i8** dest, i8** src) Disregards the current value in dest.
Definition: CGObjC.cpp:2298
virtual llvm::Constant * GetSetStructFunction()=0
void EmitAutoVarInit(const AutoVarEmission &emission)
Definition: CGDecl.cpp:1407
static Address invalid()
Definition: Address.h:35
bool hasLocalStorage() const
Returns true if a variable with function scope is a non-static local variable.
Definition: Decl.h:1035
Enters a new scope for capturing cleanups, all of which will be executed once the scope is exited...
void GenerateObjCMethod(const ObjCMethodDecl *OMD)
Generate an Objective-C method.
Definition: CGObjC.cpp:572
void EmitCallArgs(CallArgList &Args, const T *CallArgTypeInfo, llvm::iterator_range< CallExpr::const_arg_iterator > ArgRange, AbstractCallee AC=AbstractCallee(), unsigned ParamsToSkip=0, EvaluationOrder Order=EvaluationOrder::Default)
EmitCallArgs - Emit call arguments for a function.
static void emitStructSetterCall(CodeGenFunction &CGF, ObjCMethodDecl *OMD, ObjCIvarDecl *ivar)
emitStructSetterCall - Call the runtime function to store the value from the first formal parameter i...
Definition: CGObjC.cpp:1057
static CGCallee forDirect(llvm::Constant *functionPtr, const CGCalleeInfo &abstractInfo=CGCalleeInfo())
Definition: CGCall.h:134
bool isObjCRetainableType() const
Definition: Type.cpp:3896
virtual void EmitThrowStmt(CodeGen::CodeGenFunction &CGF, const ObjCAtThrowStmt &S, bool ClearInsertionPoint=true)=0
llvm::Constant * objc_retain
id objc_retain(id);
const Expr * getCallee() const
Definition: Expr.h:2417
llvm::PointerType * getType() const
Return the type of the pointer value.
Definition: Address.h:44
ObjCLifetime getObjCLifetime() const
Definition: Type.h:330
CharUnits getTypeAlignInChars(QualType T) const
Return the ABI-specified alignment of a (complete) type T, in characters.
ObjCDictionaryLiteral - AST node to represent objective-c dictionary literals; as in:"name" : NSUserN...
Definition: ExprObjC.h:288
DeclContext * getDeclContext()
Definition: DeclBase.h:427
Represents Objective-C&#39;s @synchronized statement.
Definition: StmtObjC.h:262
ObjCSelectorExpr used for @selector in Objective-C.
Definition: ExprObjC.h:429
static CharUnits fromQuantity(QuantityType Quantity)
fromQuantity - Construct a CharUnits quantity from a raw integer type.
Definition: CharUnits.h:63
void generateObjCSetterBody(const ObjCImplementationDecl *classImpl, const ObjCPropertyImplDecl *propImpl, llvm::Constant *AtomicHelperFn)
Definition: CGObjC.cpp:1166
virtual void EmitTryStmt(CodeGen::CodeGenFunction &CGF, const ObjCAtTryStmt &S)=0
llvm::Value * EmitARCAutorelease(llvm::Value *value)
Autorelease the given object.
Definition: CGObjC.cpp:2180
llvm::LLVMContext & getLLVMContext()
SmallVector< llvm::OperandBundleDef, 1 > getBundlesForFunclet(llvm::Value *Callee)
Definition: CGCall.cpp:3687
const CGFunctionInfo & arrangeBuiltinFunctionCall(QualType resultType, const CallArgList &args)
Definition: CGCall.cpp:640
QualType getType() const
Definition: Expr.h:128
virtual llvm::Value * GetSelector(CodeGenFunction &CGF, Selector Sel)=0
Get a selector for the specified name and type values.
Expr * getElement(unsigned Index)
getElement - Return the Element at the specified index.
Definition: ExprObjC.h:213
clang::ObjCRuntime ObjCRuntime
Definition: LangOptions.h:199
QualType getConstantArrayType(QualType EltTy, const llvm::APInt &ArySize, ArrayType::ArraySizeModifier ASM, unsigned IndexTypeQuals) const
Return the unique reference to the type for a constant array of the specified element type...
virtual llvm::Constant * GetPropertyGetFunction()=0
Return the runtime function for getting properties.
LValue MakeNaturalAlignAddrLValue(llvm::Value *V, QualType T)
An expression that sends a message to the given Objective-C object or class.
Definition: ExprObjC.h:904
SourceLocation getEnd() const
UnaryOperator - This represents the unary-expression&#39;s (except sizeof and alignof), the postinc/postdec operators from postfix-expression, and various extensions.
Definition: Expr.h:1876
bool isInstanceMethod() const
Definition: DeclObjC.h:414
QualType getFunctionType(QualType ResultTy, ArrayRef< QualType > Args, const FunctionProtoType::ExtProtoInfo &EPI) const
Return a normal function type with a typed argument list.
Definition: ASTContext.h:1389
ReceiverKind getReceiverKind() const
Determine the kind of receiver that this message is being sent to.
Definition: ExprObjC.h:1188
ConstantEmission tryEmitAsConstant(DeclRefExpr *refExpr)
Try to emit a reference to the given value without producing it as an l-value.
Definition: CGExpr.cpp:1415
const TargetInfo & getTarget() const
ValueDecl * getDecl()
Definition: Expr.h:1121
const Qualifiers & getQuals() const
Definition: CGValue.h:311
Selector getSelector() const
Definition: DeclObjC.h:321
const LangOptions & getLangOpts() const
ASTContext & getContext() const
ImplicitParamDecl * getSelfDecl() const
Definition: DeclObjC.h:406
bool hasEmptyCollections() const
Are the empty collection symbols available?
Definition: ObjCRuntime.h:330
QualType getType() const
Definition: DeclObjC.h:821
GlobalDecl - represents a global declaration.
Definition: GlobalDecl.h:35
static llvm::Value * emitARCStoreOperation(CodeGenFunction &CGF, Address addr, llvm::Value *value, llvm::Constant *&fn, StringRef fnName, bool ignored)
Perform an operation having the following signature: i8* (i8**, i8*)
Definition: CGObjC.cpp:1901
bool isConstQualified() const
Determine whether this type is const-qualified.
Definition: Type.h:6117
virtual void EmitSynchronizedStmt(CodeGen::CodeGenFunction &CGF, const ObjCAtSynchronizedStmt &S)=0
The l-value was considered opaque, so the alignment was determined from a type.
llvm::Constant * objc_retainBlock
id objc_retainBlock(id);
There is no lifetime qualification on this type.
Definition: Type.h:158
OpaqueValueExpr - An expression referring to an opaque object of a fixed type and value class...
Definition: Expr.h:939
Address CreateBitCast(Address Addr, llvm::Type *Ty, const llvm::Twine &Name="")
Definition: CGBuilder.h:142
SelectorTable & Selectors
Definition: ASTContext.h:566
Assigning into this object requires the old value to be released and the new value to be retained...
Definition: Type.h:169
Kind
QualType getCanonicalType() const
Definition: Type.h:6097
llvm::Constant * objc_storeWeak
id objc_storeWeak(id*, id);
PseudoObjectExpr - An expression which accesses a pseudo-object l-value.
Definition: Expr.h:5192
IdentifierInfo * getIdentifierInfoForSlot(unsigned argIndex) const
Retrieve the identifier at a given position in the selector.
static llvm::Value * emitARCUnsafeUnretainedScalarExpr(CodeGenFunction &CGF, const Expr *e)
Definition: CGObjC.cpp:3104
Encodes a location in the source.
void EnsureInsertPoint()
EnsureInsertPoint - Ensure that an insertion point is defined so that emitted IR has a place to go...
llvm::Value * EmitObjCArrayLiteral(const ObjCArrayLiteral *E)
Definition: CGObjC.cpp:239
body_range body()
Definition: Stmt.h:836
IdentifierInfo & get(StringRef Name)
Return the identifier token info for the specified named identifier.
static void emitCPPObjectAtomicGetterCall(CodeGenFunction &CGF, llvm::Value *returnAddr, ObjCIvarDecl *ivar, llvm::Constant *AtomicHelperFn)
emitCPPObjectAtomicGetterCall - Call the runtime function to copy the ivar into the resturn slot...
Definition: CGObjC.cpp:849
void EmitARCRelease(llvm::Value *value, ARCPreciseLifetime_t precise)
Release the given object.
Definition: CGObjC.cpp:2073
LValue EmitDeclRefLValue(const DeclRefExpr *E)
Definition: CGExpr.cpp:2439
std::pair< LValue, llvm::Value * > EmitARCStoreUnsafeUnretained(const BinaryOperator *e, bool ignored)
Definition: CGObjC.cpp:3125
virtual ConstantAddress GenerateConstantString(const StringLiteral *)=0
Generate a constant string object.
LValue EmitCheckedLValue(const Expr *E, TypeCheckKind TCK)
Same as EmitLValue but additionally we generate checking code to guard against undefined behavior...
Definition: CGExpr.cpp:1196
AggValueSlot::Overlap_t overlapForReturnValue()
Determine whether a return value slot may overlap some other object.
CastKind getCastKind() const
Definition: Expr.h:2941
llvm::CallSite EmitRuntimeCallOrInvoke(llvm::Value *callee, ArrayRef< llvm::Value *> args, const Twine &name="")
Emits a call or invoke instruction to the given runtime function.
Definition: CGCall.cpp:3746
unsigned getNumElements() const
getNumElements - Return number of elements of objective-c dictionary literal.
Definition: ExprObjC.h:342
void EmitObjCForCollectionStmt(const ObjCForCollectionStmt &S)
Definition: CGObjC.cpp:1476
llvm::Value * EmitARCUnsafeClaimAutoreleasedReturnValue(llvm::Value *value)
Claim a possibly-autoreleased return value at +0.
Definition: CGObjC.cpp:2064
DeclStmt - Adaptor class for mixing declarations with statements and expressions. ...
Definition: Stmt.h:705
Stmt * getBody() const override
Retrieve the body of this method, if it has one.
Definition: DeclObjC.cpp:852
llvm::Constant * objc_autoreleasePoolPush
void *objc_autoreleasePoolPush(void);
static TryEmitResult tryEmitARCRetainLoadOfScalar(CodeGenFunction &CGF, LValue lvalue, QualType type)
Definition: CGObjC.cpp:2465
const CGFunctionInfo & arrangeObjCMethodDeclaration(const ObjCMethodDecl *MD)
Objective-C methods are C functions with some implicit parameters.
Definition: CGCall.cpp:455
void EmitStmt(const Stmt *S, ArrayRef< const Attr *> Attrs=None)
EmitStmt - Emit the code for the statement.
Definition: CGStmt.cpp:48
virtual llvm::Value * EmitNSAutoreleasePoolClassRef(CodeGenFunction &CGF)
ObjCEntrypoints & getObjCEntrypoints() const
CanQualType VoidTy
Definition: ASTContext.h:1025
ObjCProtocolExpr used for protocol expression in Objective-C.
Definition: ExprObjC.h:474
virtual llvm::Value * GenerateProtocolRef(CodeGenFunction &CGF, const ObjCProtocolDecl *OPD)=0
Emit the code to return the named protocol as an object, as in a @protocol expression.
llvm::InlineAsm * retainAutoreleasedReturnValueMarker
A void(void) inline asm to use to mark that the return value of a call will be immediately retain...
An aligned address.
Definition: Address.h:25
void StartFunction(GlobalDecl GD, QualType RetTy, llvm::Function *Fn, const CGFunctionInfo &FnInfo, const FunctionArgList &Args, SourceLocation Loc=SourceLocation(), SourceLocation StartLoc=SourceLocation())
Emit code for the start of a function.
Represents one property declaration in an Objective-C interface.
Definition: DeclObjC.h:721
ImplicitCastExpr - Allows us to explicitly represent implicit type conversions, which have no direct ...
Definition: Expr.h:3016
DestructionKind isDestructedType() const
Returns a nonzero value if objects of this type require non-trivial work to clean up after...
Definition: Type.h:1160
All available information about a concrete callee.
Definition: CGCall.h:67
JumpDest getJumpDestInCurrentScope(llvm::BasicBlock *Target)
The given basic block lies in the current EH scope, but may be a target of a potentially scope-crossi...
Expr * getSubExpr()
Definition: ExprObjC.h:135
const ObjCMethodDecl * getMethodDecl() const
Definition: ExprObjC.h:1303
static void destroyARCStrongWithStore(CodeGenFunction &CGF, Address addr, QualType type)
Like CodeGenFunction::destroyARCStrong, but do it with a call.
Definition: CGObjC.cpp:1382
Assigning into this object requires a lifetime extension.
Definition: Type.h:175
QualType getType() const
Definition: CGValue.h:264
ObjCBoxedExpr - used for generalized expression boxing.
Definition: ExprObjC.h:117
virtual llvm::Constant * GetCppAtomicObjectGetFunction()=0
API for atomic copying of qualified aggregates with non-trivial copy assignment (c++) in getter...
llvm::Value * EmitARCRetain(QualType type, llvm::Value *value)
Produce the code to do a retain.
Definition: CGObjC.cpp:1957
void emitARCMoveAssignWeak(QualType Ty, Address DstAddr, Address SrcAddr)
Definition: CGObjC.cpp:2320
bool hasSameUnqualifiedType(QualType T1, QualType T2) const
Determine whether the given types are equivalent after cvr-qualifiers have been removed.
Definition: ASTContext.h:2302
static Destroyer destroyARCStrongImprecise
void FinishFunction(SourceLocation EndLoc=SourceLocation())
FinishFunction - Complete IR generation of the current function.
Expr * Value
The value of the dictionary element.
Definition: ExprObjC.h:244
std::pair< CharUnits, CharUnits > getTypeInfoInChars(const Type *T) const
ConstantAddress GetAddrOfConstantCString(const std::string &Str, const char *GlobalName=nullptr)
Returns a pointer to a character array containing the literal and a terminating &#39;\0&#39; character...
Expr * getLHS() const
Definition: Expr.h:3242
void EmitObjCMRRAutoreleasePoolPop(llvm::Value *Ptr)
Produce the code to do a primitive release.
Definition: CGObjC.cpp:2390
llvm::Value * EmitScalarExpr(const Expr *E, bool IgnoreResultAssign=false)
EmitScalarExpr - Emit the computation of the specified expression of LLVM scalar type, returning the result.
Expr * getInstanceReceiver()
Returns the object expression (receiver) for an instance message, or null for a message that is not a...
Definition: ExprObjC.h:1207
FunctionArgList - Type for representing both the decl and type of parameters to a function...
Definition: CGCall.h:356
ObjCIvarDecl * getNextIvar()
Definition: DeclObjC.h:1970
llvm::Value * getScalarVal() const
getScalarVal() - Return the Value* of this scalar value.
Definition: CGValue.h:59
Expr * getResultExpr()
Return the result-bearing expression, or null if there is none.
Definition: Expr.h:5247
void EmitObjCAtSynchronizedStmt(const ObjCAtSynchronizedStmt &S)
Definition: CGObjC.cpp:1773
void ErrorUnsupported(const Stmt *S, const char *Type)
Print out an error that codegen doesn&#39;t support the specified stmt yet.
CGFunctionInfo - Class to encapsulate the information about a function definition.
This class organizes the cross-function state that is used while generating LLVM code.
llvm::Constant * objc_unsafeClaimAutoreleasedReturnValue
id objc_unsafeClaimAutoreleasedReturnValue(id);
const ObjCInterfaceDecl * getClassInterface() const
Definition: DeclObjC.h:2432
Dataflow Directional Tag Classes.
static llvm::Value * emitARCValueOperation(CodeGenFunction &CGF, llvm::Value *value, llvm::Constant *&fn, StringRef fnName, bool isTailCall=false)
Perform an operation having the signature i8* (i8*) where a null input causes a no-op and returns nul...
Definition: CGObjC.cpp:1846
void GenerateObjCGetter(ObjCImplementationDecl *IMP, const ObjCPropertyImplDecl *PID)
GenerateObjCGetter - Synthesize an Objective-C property getter function.
Definition: CGObjC.cpp:810
void EmitObjCAutoreleasePoolPop(llvm::Value *Ptr)
Produce the code to do a primitive release.
Definition: CGObjC.cpp:2343
The basic abstraction for the target Objective-C runtime.
Definition: ObjCRuntime.h:28
llvm::Value * EmitARCLoadWeakRetained(Address addr)
i8* @objc_loadWeakRetained(i8** addr)
Definition: CGObjC.cpp:2243
Address CreateStructGEP(Address Addr, unsigned Index, CharUnits Offset, const llvm::Twine &Name="")
Definition: CGBuilder.h:172
static ReturnStmt * Create(const ASTContext &Ctx, SourceLocation RL, Expr *E, const VarDecl *NRVOCandidate)
Create a return statement.
Definition: Stmt.cpp:1059
QualType getSuperType() const
Retrieve the type referred to by &#39;super&#39;.
Definition: ExprObjC.h:1283
llvm::LoadInst * CreateAlignedLoad(llvm::Value *Addr, CharUnits Align, const llvm::Twine &Name="")
Definition: CGBuilder.h:91
void EmitARCIntrinsicUse(ArrayRef< llvm::Value *> values)
Given a number of pointers, inform the optimizer that they&#39;re being intrinsically used up until this ...
Definition: CGObjC.cpp:1807
llvm::Constant * getPointer() const
Definition: Address.h:84
llvm::LoadInst * CreateLoad(Address Addr, const llvm::Twine &Name="")
Definition: CGBuilder.h:70
llvm::Constant * objc_destroyWeak
void objc_destroyWeak(id*);
U cast(CodeGen::Address addr)
Definition: Address.h:109
llvm::Constant * clang_arc_use
void clang.arc.use(...);
const ObjCObjectType * getObjectType() const
Gets the type pointed to by this ObjC pointer.
Definition: Type.h:5821
QualType TypeOfSelfObject()
TypeOfSelfObject - Return type of object that this self represents.
Definition: CGObjC.cpp:1468
Checking the destination of a store. Must be suitably sized and aligned.
llvm::StoreInst * CreateStore(llvm::Value *Val, Address Addr, bool IsVolatile=false)
Definition: CGBuilder.h:108
semantics_iterator semantics_begin()
Definition: Expr.h:5260
static AggValueSlot forLValue(const LValue &LV, IsDestructed_t isDestructed, NeedsGCBarriers_t needsGC, IsAliased_t isAliased, Overlap_t mayOverlap, IsZeroed_t isZeroed=IsNotZeroed, IsSanitizerChecked_t isChecked=IsNotSanitizerChecked)
Definition: CGValue.h:540
llvm::Constant * GenerateObjCAtomicGetterCopyHelperFunction(const ObjCPropertyImplDecl *PID)
Definition: CGObjC.cpp:3315
llvm::Module & getModule() const
static bool hasTrivialSetExpr(const ObjCPropertyImplDecl *PID)
Definition: CGObjC.cpp:1135
void EmitObjCAtThrowStmt(const ObjCAtThrowStmt &S)
Definition: CGObjC.cpp:1769
LValue MakeAddrLValue(Address Addr, QualType T, AlignmentSource Source=AlignmentSource::Type)
static CharUnits getMaxAtomicAccessSize(CodeGenModule &CGM, llvm::Triple::ArchType arch)
Return the maximum size that permits atomic accesses for the given architecture.
Definition: CGObjC.cpp:623
void EmitAggExpr(const Expr *E, AggValueSlot AS)
EmitAggExpr - Emit the computation of the specified expression of aggregate type. ...
Definition: CGExprAgg.cpp:1777
QualType getClassReceiver() const
Returns the type of a class message send, or NULL if the message is not a class message.
Definition: ExprObjC.h:1226
Represents a pointer to an Objective C object.
Definition: Type.h:5780
void EmitAutoVarCleanups(const AutoVarEmission &emission)
Definition: CGDecl.cpp:1608
ObjCImplementationDecl - Represents a class definition - this is where method definitions are specifi...
Definition: DeclObjC.h:2544
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:4356
static llvm::Value * emitARCOperationAfterCall(CodeGenFunction &CGF, llvm::Value *value, ValueTransform doAfterCall, ValueTransform doFallback)
Insert code immediately after a call.
Definition: CGObjC.cpp:2531
virtual llvm::Constant * EnumerationMutationFunction()=0
EnumerationMutationFunction - Return the function that&#39;s called by the compiler when a mutation is de...
unsigned getNumElements() const
getNumElements - Return number of elements of objective-c array literal.
Definition: ExprObjC.h:210
Represents Objective-C&#39;s collection statement.
Definition: StmtObjC.h:24
CodeGenTypes & getTypes() const
Address CreateConstArrayGEP(Address Addr, uint64_t Index, CharUnits EltSize, const llvm::Twine &Name="")
Given addr = [n x T]* ...
Definition: CGBuilder.h:195
void EmitStoreOfComplex(ComplexPairTy V, LValue dest, bool isInit)
EmitStoreOfComplex - Store a complex number into the specified l-value.
static void emitARCCopyOperation(CodeGenFunction &CGF, Address dst, Address src, llvm::Constant *&fn, StringRef fnName)
Perform an operation having the following signature: void (i8**, i8**)
Definition: CGObjC.cpp:1932
bool hasNonTrivialObjCLifetime() const
Definition: Type.h:1070
Selector getSelector(unsigned NumArgs, IdentifierInfo **IIV)
Can create any sort of selector.
llvm::Type * getElementType() const
Return the type of the values stored in this address.
Definition: Address.h:52
This class organizes the cross-module state that is used while lowering AST types to LLVM types...
Definition: CodeGenTypes.h:120
void getObjCEncodingForType(QualType T, std::string &S, const FieldDecl *Field=nullptr, QualType *NotEncodedT=nullptr) const
Emit the Objective-CC type encoding for the given type T into S.
bool isDelegateInitCall() const
isDelegateInitCall - Answers whether this message send has been tagged as a "delegate init call"...
Definition: ExprObjC.h:1360
LValue EmitLValueForIvar(QualType ObjectTy, llvm::Value *Base, const ObjCIvarDecl *Ivar, unsigned CVRQualifiers)
Definition: CGExpr.cpp:4561
llvm::Constant * objc_retainAutorelease
id objc_retainAutorelease(id);
param_const_iterator param_begin() const
Definition: DeclObjC.h:348
llvm::Value * EmitIvarOffset(const ObjCInterfaceDecl *Interface, const ObjCIvarDecl *Ivar)
Definition: CGExpr.cpp:4556
void SetInternalFunctionAttributes(GlobalDecl GD, llvm::Function *F, const CGFunctionInfo &FI)
Set the attributes on the LLVM function for the given decl and function info.
llvm::Value * EmitARCRetainAutorelease(QualType type, llvm::Value *value)
Do a fused retain/autorelease of the given object.
Definition: CGObjC.cpp:2211
Internal linkage, which indicates that the entity can be referred to from within the translation unit...
Definition: Linkage.h:32
void EmitBlock(llvm::BasicBlock *BB, bool IsFinished=false)
EmitBlock - Emit the given block.
Definition: CGStmt.cpp:445
void setAtomicSetterHelperFnMap(QualType Ty, llvm::Constant *Fn)
void EmitARCInitWeak(Address addr, llvm::Value *value)
i8* @objc_initWeak(i8** addr, i8* value) Returns value.
Definition: CGObjC.cpp:2263
ARCPreciseLifetime_t
Does an ARC strong l-value have precise lifetime?
Definition: CGValue.h:120
uint64_t getTypeSize(QualType T) const
Return the size of the specified (complete) type T, in bits.
Definition: ASTContext.h:2079
ObjCIvarRefExpr - A reference to an ObjC instance variable.
Definition: ExprObjC.h:513
llvm::Constant * objc_moveWeak
void objc_moveWeak(id *dest, id *src);
llvm::ConstantInt * getSize(CharUnits numChars)
Emit the given number of characters as a value of type size_t.
const Decl * CurFuncDecl
CurFuncDecl - Holds the Decl for the current outermost non-closure context.
CanQualType getCanonicalType(QualType T) const
Return the canonical (structural) type corresponding to the specified potentially non-canonical type ...
Definition: ASTContext.h:2262
virtual llvm::Value * GetClass(CodeGenFunction &CGF, const ObjCInterfaceDecl *OID)=0
GetClass - Return a reference to the class for the given interface decl.
Reading or writing from this object requires a barrier call.
Definition: Type.h:172
void EmitLexicalBlockStart(CGBuilderTy &Builder, SourceLocation Loc)
Emit metadata to indicate the beginning of a new lexical block and push the block onto the stack...
int64_t toBits(CharUnits CharSize) const
Convert a size in characters to a size in bits.
TranslationUnitDecl * getTranslationUnitDecl() const
Definition: ASTContext.h:1018
llvm::iterator_range< arg_iterator > arguments()
Definition: ExprObjC.h:1408
A non-RAII class containing all the information about a bound opaque value.
QualType getUnqualifiedType() const
Retrieve the unqualified variant of the given type, removing as little sugar as possible.
Definition: Type.h:6138
llvm::Value * EmitObjCCollectionLiteral(const Expr *E, const ObjCMethodDecl *MethodWithObjects)
Definition: CGObjC.cpp:113
void EmitReturnStmt(const ReturnStmt &S)
EmitReturnStmt - Note that due to GCC extensions, this can have an operand if the function returns vo...
Definition: CGStmt.cpp:1023
llvm::Type * ConvertType(QualType T)
ObjCIvarDecl - Represents an ObjC instance variable.
Definition: DeclObjC.h:1937
static llvm::Constant * getNullForVariable(Address addr)
Given the address of a variable of pointer type, find the correct null to store into it...
Definition: CGObjC.cpp:40
LValue EmitLValue(const Expr *E)
EmitLValue - Emit code to compute a designator that specifies the location of the expression...
Definition: CGExpr.cpp:1232
Address ReturnValue
ReturnValue - The temporary alloca to hold the return value.
QualType getPointerType(QualType T) const
Return the uniqued reference to the type for a pointer to the specified type.
ImplicitParamDecl * getCmdDecl() const
Definition: DeclObjC.h:408
The receiver is a class.
Definition: ExprObjC.h:1052
Represents Objective-C&#39;s @try ... @catch ... @finally statement.
Definition: StmtObjC.h:154
SourceRange getSourceRange() const LLVM_READONLY
SourceLocation tokens are not useful in isolation - they are low level value objects created/interpre...
Definition: Stmt.cpp:268
bool AutoreleaseResult
In ARC, whether we should autorelease the return value.
RValue EmitLoadOfLValue(LValue V, SourceLocation Loc)
EmitLoadOfLValue - Given an expression that represents a value lvalue, this method emits the address ...
Definition: CGExpr.cpp:1756
llvm::Value * EmitARCRetainBlock(llvm::Value *value, bool mandatory)
Retain the given block, with _Block_copy semantics.
Definition: CGObjC.cpp:1978
void generateObjCGetterBody(const ObjCImplementationDecl *classImpl, const ObjCPropertyImplDecl *propImpl, const ObjCMethodDecl *GetterMothodDecl, llvm::Constant *AtomicHelperFn)
Definition: CGObjC.cpp:879
CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]).
Definition: Expr.h:2377
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: DeclObjC.h:283
void StartObjCMethod(const ObjCMethodDecl *MD, const ObjCContainerDecl *CD)
StartObjCMethod - Begin emission of an ObjCMethod.
Definition: CGObjC.cpp:532
llvm::Constant * IsOSVersionAtLeastFn
bool hasARCUnsafeClaimAutoreleasedReturnValue() const
Is objc_unsafeClaimAutoreleasedReturnValue available?
Definition: ObjCRuntime.h:313
static Decl::Kind getKind(const Decl *D)
Definition: DeclBase.cpp:954
virtual llvm::Constant * GetCppAtomicObjectSetFunction()=0
API for atomic copying of qualified aggregates with non-trivial copy assignment (c++) in setter...
QualType getObjCFastEnumerationStateType()
Retrieve the record type that describes the state of an Objective-C fast enumeration loop (for...
void EmitObjCAutoreleasePoolCleanup(llvm::Value *Ptr)
Definition: CGObjC.cpp:2443
bool hasNativeARC() const
Does this runtime natively provide the ARC entrypoints?
Definition: ObjCRuntime.h:162
void EmitAggregateCopy(LValue Dest, LValue Src, QualType EltTy, AggValueSlot::Overlap_t MayOverlap, bool isVolatile=false)
EmitAggregateCopy - Emit an aggregate copy.
Definition: CGExprAgg.cpp:1823
A reference to a declared variable, function, enum, etc.
Definition: Expr.h:1036
static RValue get(llvm::Value *V)
Definition: CGValue.h:86
Expr * getRHS() const
Definition: Expr.h:3244
ObjCPropertyDecl * getPropertyDecl() const
Definition: DeclObjC.h:2810
static const Expr * findWeakLValue(const Expr *E)
Given an expression of ObjC pointer type, check whether it was immediately loaded from an ARC __weak ...
Definition: CGObjC.cpp:342
CharUnits getTypeSizeInChars(QualType T) const
Return the size of the specified (complete) type T, in characters.
static void emitAutoreleasedReturnValueMarker(CodeGenFunction &CGF)
Definition: CGObjC.cpp:2001
Address EmitCompoundStmtWithoutScope(const CompoundStmt &S, bool GetLast=false, AggValueSlot AVS=AggValueSlot::ignored())
Definition: CGStmt.cpp:384
llvm::Value * LoadObjCSelf()
LoadObjCSelf - Load the value of self.
Definition: CGObjC.cpp:1461
QualType getType() const
Definition: Decl.h:647
An l-value expression is a reference to an object with independent storage.
Definition: Specifiers.h:114
A trivial tuple used to represent a source range.
void EmitObjCAtTryStmt(const ObjCAtTryStmt &S)
Definition: CGObjC.cpp:1765
LValue - This represents an lvalue references.
Definition: CGValue.h:167
An abstract representation of regular/ObjC call/message targets.
ObjCMethodDecl * getGetterMethodDecl() const
Definition: DeclObjC.h:914
Information for lazily generating a cleanup.
Definition: EHScopeStack.h:147
ObjCIvarDecl * all_declared_ivar_begin()
all_declared_ivar_begin - return first ivar declared in this class, its extensions and its implementa...
Definition: DeclObjC.cpp:1592
llvm::Value * EmitObjCConsumeObject(QualType T, llvm::Value *Ptr)
Produce the code for a CK_ARCConsumeObject.
Definition: CGObjC.cpp:1792
CanQualType BoolTy
Definition: ASTContext.h:1026
static llvm::Value * emitARCLoadOperation(CodeGenFunction &CGF, Address addr, llvm::Constant *&fn, StringRef fnName)
Perform an operation having the following signature: i8* (i8**)
Definition: CGObjC.cpp:1875
llvm::PointerIntPair< llvm::Value *, 1, bool > TryEmitResult
Definition: CGObjC.cpp:31
const LangOptions & getLangOpts() const
The receiver is a superclass.
Definition: ExprObjC.h:1058
llvm::Constant * objc_retainAutoreleaseReturnValue
id objc_retainAutoreleaseReturnValue(id);
void EmitObjCAutoreleasePoolStmt(const ObjCAutoreleasePoolStmt &S)
Definition: CGObjC.cpp:3184
SourceLocation getBegin() const
CallArgList - Type for representing both the value and type of arguments in a call.
Definition: CGCall.h:260
Represents Objective-C&#39;s @autoreleasepool Statement.
Definition: StmtObjC.h:345
llvm::Value * getPointer() const
Definition: CGValue.h:323
SourceLocation getBodyRBrace() const
getBodyRBrace - Gets the right brace of the body, if a body exists.
Definition: DeclBase.cpp:906
SourceLocation getLocation() const
Definition: DeclBase.h:418
void emitARCCopyAssignWeak(QualType Ty, Address DstAddr, Address SrcAddr)
Definition: CGObjC.cpp:2313
void EmitNullInitialization(Address DestPtr, QualType Ty)
EmitNullInitialization - Generate code to set a value of the given type to null, If the type contains...
llvm::Value * EmitBuiltinAvailable(ArrayRef< llvm::Value *> Args)
Definition: CGObjC.cpp:3445
ArrayRef< ParmVarDecl * > parameters() const
Definition: DeclObjC.h:367
Expr * IgnoreParens() LLVM_READONLY
IgnoreParens - Ignore parentheses.
Definition: Expr.cpp:2539
static void emitCPPObjectAtomicSetterCall(CodeGenFunction &CGF, ObjCMethodDecl *OMD, ObjCIvarDecl *ivar, llvm::Constant *AtomicHelperFn)
emitCPPObjectAtomicSetterCall - Call the runtime function to store the value from the first formal pa...
Definition: CGObjC.cpp:1100
static OMPLinearClause * Create(const ASTContext &C, SourceLocation StartLoc, SourceLocation LParenLoc, OpenMPLinearClauseKind Modifier, SourceLocation ModifierLoc, SourceLocation ColonLoc, SourceLocation EndLoc, ArrayRef< Expr *> VL, ArrayRef< Expr *> PL, ArrayRef< Expr *> IL, Expr *Step, Expr *CalcStep, Stmt *PreInit, Expr *PostUpdate)
Creates clause with a list of variables VL and a linear step Step.
llvm::Value * EmitObjCSelectorExpr(const ObjCSelectorExpr *E)
Emit a selector.
Definition: CGObjC.cpp:249
CanQualType getSizeType() const
Return the unique type for "size_t" (C99 7.17), defined in <stddef.h>.
void Destroyer(CodeGenFunction &CGF, Address addr, QualType ty)
Qualifiers::ObjCLifetime getObjCLifetime() const
Returns lifetime attribute of this type.
Definition: Type.h:1066
static void emitCXXDestructMethod(CodeGenFunction &CGF, ObjCImplementationDecl *impl)
Definition: CGObjC.cpp:1389
llvm::Value * EmitObjCProtocolExpr(const ObjCProtocolExpr *E)
Definition: CGObjC.cpp:257
llvm::FunctionType * GetFunctionType(const CGFunctionInfo &Info)
GetFunctionType - Get the LLVM function type for.
Definition: CGCall.cpp:1544
QualType getPointeeType() const
Gets the type pointed to by this ObjC pointer.
Definition: Type.h:5796
const llvm::Triple & getTriple() const