clang  6.0.0svn
SemaExprObjC.cpp
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1 //===--- SemaExprObjC.cpp - Semantic Analysis for ObjC Expressions --------===//
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 file implements semantic analysis for Objective-C expressions.
11 //
12 //===----------------------------------------------------------------------===//
13 
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/DeclObjC.h"
17 #include "clang/AST/ExprObjC.h"
18 #include "clang/AST/StmtVisitor.h"
19 #include "clang/AST/TypeLoc.h"
21 #include "clang/Edit/Commit.h"
22 #include "clang/Edit/Rewriters.h"
23 #include "clang/Lex/Preprocessor.h"
25 #include "clang/Sema/Lookup.h"
26 #include "clang/Sema/Scope.h"
27 #include "clang/Sema/ScopeInfo.h"
28 #include "llvm/ADT/SmallString.h"
29 
30 using namespace clang;
31 using namespace sema;
32 using llvm::makeArrayRef;
33 
35  ArrayRef<Expr *> Strings) {
36  // Most ObjC strings are formed out of a single piece. However, we *can*
37  // have strings formed out of multiple @ strings with multiple pptokens in
38  // each one, e.g. @"foo" "bar" @"baz" "qux" which need to be turned into one
39  // StringLiteral for ObjCStringLiteral to hold onto.
40  StringLiteral *S = cast<StringLiteral>(Strings[0]);
41 
42  // If we have a multi-part string, merge it all together.
43  if (Strings.size() != 1) {
44  // Concatenate objc strings.
45  SmallString<128> StrBuf;
47 
48  for (Expr *E : Strings) {
49  S = cast<StringLiteral>(E);
50 
51  // ObjC strings can't be wide or UTF.
52  if (!S->isAscii()) {
53  Diag(S->getLocStart(), diag::err_cfstring_literal_not_string_constant)
54  << S->getSourceRange();
55  return true;
56  }
57 
58  // Append the string.
59  StrBuf += S->getString();
60 
61  // Get the locations of the string tokens.
62  StrLocs.append(S->tokloc_begin(), S->tokloc_end());
63  }
64 
65  // Create the aggregate string with the appropriate content and location
66  // information.
67  const ConstantArrayType *CAT = Context.getAsConstantArrayType(S->getType());
68  assert(CAT && "String literal not of constant array type!");
69  QualType StrTy = Context.getConstantArrayType(
70  CAT->getElementType(), llvm::APInt(32, StrBuf.size() + 1),
72  S = StringLiteral::Create(Context, StrBuf, StringLiteral::Ascii,
73  /*Pascal=*/false, StrTy, &StrLocs[0],
74  StrLocs.size());
75  }
76 
77  return BuildObjCStringLiteral(AtLocs[0], S);
78 }
79 
81  // Verify that this composite string is acceptable for ObjC strings.
82  if (CheckObjCString(S))
83  return true;
84 
85  // Initialize the constant string interface lazily. This assumes
86  // the NSString interface is seen in this translation unit. Note: We
87  // don't use NSConstantString, since the runtime team considers this
88  // interface private (even though it appears in the header files).
90  if (!Ty.isNull()) {
91  Ty = Context.getObjCObjectPointerType(Ty);
92  } else if (getLangOpts().NoConstantCFStrings) {
93  IdentifierInfo *NSIdent=nullptr;
94  std::string StringClass(getLangOpts().ObjCConstantStringClass);
95 
96  if (StringClass.empty())
97  NSIdent = &Context.Idents.get("NSConstantString");
98  else
99  NSIdent = &Context.Idents.get(StringClass);
100 
101  NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc,
102  LookupOrdinaryName);
103  if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
104  Context.setObjCConstantStringInterface(StrIF);
105  Ty = Context.getObjCConstantStringInterface();
106  Ty = Context.getObjCObjectPointerType(Ty);
107  } else {
108  // If there is no NSConstantString interface defined then treat this
109  // as error and recover from it.
110  Diag(S->getLocStart(), diag::err_no_nsconstant_string_class) << NSIdent
111  << S->getSourceRange();
112  Ty = Context.getObjCIdType();
113  }
114  } else {
115  IdentifierInfo *NSIdent = NSAPIObj->getNSClassId(NSAPI::ClassId_NSString);
116  NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc,
117  LookupOrdinaryName);
118  if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
119  Context.setObjCConstantStringInterface(StrIF);
120  Ty = Context.getObjCConstantStringInterface();
121  Ty = Context.getObjCObjectPointerType(Ty);
122  } else {
123  // If there is no NSString interface defined, implicitly declare
124  // a @class NSString; and use that instead. This is to make sure
125  // type of an NSString literal is represented correctly, instead of
126  // being an 'id' type.
127  Ty = Context.getObjCNSStringType();
128  if (Ty.isNull()) {
129  ObjCInterfaceDecl *NSStringIDecl =
130  ObjCInterfaceDecl::Create (Context,
131  Context.getTranslationUnitDecl(),
132  SourceLocation(), NSIdent,
133  nullptr, nullptr, SourceLocation());
134  Ty = Context.getObjCInterfaceType(NSStringIDecl);
135  Context.setObjCNSStringType(Ty);
136  }
137  Ty = Context.getObjCObjectPointerType(Ty);
138  }
139  }
140 
141  return new (Context) ObjCStringLiteral(S, Ty, AtLoc);
142 }
143 
144 /// \brief Emits an error if the given method does not exist, or if the return
145 /// type is not an Objective-C object.
147  const ObjCInterfaceDecl *Class,
148  Selector Sel, const ObjCMethodDecl *Method) {
149  if (!Method) {
150  // FIXME: Is there a better way to avoid quotes than using getName()?
151  S.Diag(Loc, diag::err_undeclared_boxing_method) << Sel << Class->getName();
152  return false;
153  }
154 
155  // Make sure the return type is reasonable.
156  QualType ReturnType = Method->getReturnType();
157  if (!ReturnType->isObjCObjectPointerType()) {
158  S.Diag(Loc, diag::err_objc_literal_method_sig)
159  << Sel;
160  S.Diag(Method->getLocation(), diag::note_objc_literal_method_return)
161  << ReturnType;
162  return false;
163  }
164 
165  return true;
166 }
167 
168 /// \brief Maps ObjCLiteralKind to NSClassIdKindKind
170  Sema::ObjCLiteralKind LiteralKind) {
171  switch (LiteralKind) {
172  case Sema::LK_Array:
173  return NSAPI::ClassId_NSArray;
174  case Sema::LK_Dictionary:
176  case Sema::LK_Numeric:
178  case Sema::LK_String:
180  case Sema::LK_Boxed:
181  return NSAPI::ClassId_NSValue;
182 
183  // there is no corresponding matching
184  // between LK_None/LK_Block and NSClassIdKindKind
185  case Sema::LK_Block:
186  case Sema::LK_None:
187  break;
188  }
189  llvm_unreachable("LiteralKind can't be converted into a ClassKind");
190 }
191 
192 /// \brief Validates ObjCInterfaceDecl availability.
193 /// ObjCInterfaceDecl, used to create ObjC literals, should be defined
194 /// if clang not in a debugger mode.
196  SourceLocation Loc,
197  Sema::ObjCLiteralKind LiteralKind) {
198  if (!Decl) {
200  IdentifierInfo *II = S.NSAPIObj->getNSClassId(Kind);
201  S.Diag(Loc, diag::err_undeclared_objc_literal_class)
202  << II->getName() << LiteralKind;
203  return false;
204  } else if (!Decl->hasDefinition() && !S.getLangOpts().DebuggerObjCLiteral) {
205  S.Diag(Loc, diag::err_undeclared_objc_literal_class)
206  << Decl->getName() << LiteralKind;
207  S.Diag(Decl->getLocation(), diag::note_forward_class);
208  return false;
209  }
210 
211  return true;
212 }
213 
214 /// \brief Looks up ObjCInterfaceDecl of a given NSClassIdKindKind.
215 /// Used to create ObjC literals, such as NSDictionary (@{}),
216 /// NSArray (@[]) and Boxed Expressions (@())
218  SourceLocation Loc,
219  Sema::ObjCLiteralKind LiteralKind) {
220  NSAPI::NSClassIdKindKind ClassKind = ClassKindFromLiteralKind(LiteralKind);
221  IdentifierInfo *II = S.NSAPIObj->getNSClassId(ClassKind);
222  NamedDecl *IF = S.LookupSingleName(S.TUScope, II, Loc,
224  ObjCInterfaceDecl *ID = dyn_cast_or_null<ObjCInterfaceDecl>(IF);
225  if (!ID && S.getLangOpts().DebuggerObjCLiteral) {
226  ASTContext &Context = S.Context;
228  ID = ObjCInterfaceDecl::Create (Context, TU, SourceLocation(), II,
229  nullptr, nullptr, SourceLocation());
230  }
231 
232  if (!ValidateObjCLiteralInterfaceDecl(S, ID, Loc, LiteralKind)) {
233  ID = nullptr;
234  }
235 
236  return ID;
237 }
238 
239 /// \brief Retrieve the NSNumber factory method that should be used to create
240 /// an Objective-C literal for the given type.
242  QualType NumberType,
243  bool isLiteral = false,
244  SourceRange R = SourceRange()) {
246  S.NSAPIObj->getNSNumberFactoryMethodKind(NumberType);
247 
248  if (!Kind) {
249  if (isLiteral) {
250  S.Diag(Loc, diag::err_invalid_nsnumber_type)
251  << NumberType << R;
252  }
253  return nullptr;
254  }
255 
256  // If we already looked up this method, we're done.
257  if (S.NSNumberLiteralMethods[*Kind])
258  return S.NSNumberLiteralMethods[*Kind];
259 
260  Selector Sel = S.NSAPIObj->getNSNumberLiteralSelector(*Kind,
261  /*Instance=*/false);
262 
263  ASTContext &CX = S.Context;
264 
265  // Look up the NSNumber class, if we haven't done so already. It's cached
266  // in the Sema instance.
267  if (!S.NSNumberDecl) {
270  if (!S.NSNumberDecl) {
271  return nullptr;
272  }
273  }
274 
275  if (S.NSNumberPointer.isNull()) {
276  // generate the pointer to NSNumber type.
277  QualType NSNumberObject = CX.getObjCInterfaceType(S.NSNumberDecl);
278  S.NSNumberPointer = CX.getObjCObjectPointerType(NSNumberObject);
279  }
280 
281  // Look for the appropriate method within NSNumber.
283  if (!Method && S.getLangOpts().DebuggerObjCLiteral) {
284  // create a stub definition this NSNumber factory method.
285  TypeSourceInfo *ReturnTInfo = nullptr;
286  Method =
288  S.NSNumberPointer, ReturnTInfo, S.NSNumberDecl,
289  /*isInstance=*/false, /*isVariadic=*/false,
290  /*isPropertyAccessor=*/false,
291  /*isImplicitlyDeclared=*/true,
292  /*isDefined=*/false, ObjCMethodDecl::Required,
293  /*HasRelatedResultType=*/false);
294  ParmVarDecl *value = ParmVarDecl::Create(S.Context, Method,
296  &CX.Idents.get("value"),
297  NumberType, /*TInfo=*/nullptr,
298  SC_None, nullptr);
299  Method->setMethodParams(S.Context, value, None);
300  }
301 
302  if (!validateBoxingMethod(S, Loc, S.NSNumberDecl, Sel, Method))
303  return nullptr;
304 
305  // Note: if the parameter type is out-of-line, we'll catch it later in the
306  // implicit conversion.
307 
308  S.NSNumberLiteralMethods[*Kind] = Method;
309  return Method;
310 }
311 
312 /// BuildObjCNumericLiteral - builds an ObjCBoxedExpr AST node for the
313 /// numeric literal expression. Type of the expression will be "NSNumber *".
315  // Determine the type of the literal.
316  QualType NumberType = Number->getType();
317  if (CharacterLiteral *Char = dyn_cast<CharacterLiteral>(Number)) {
318  // In C, character literals have type 'int'. That's not the type we want
319  // to use to determine the Objective-c literal kind.
320  switch (Char->getKind()) {
323  NumberType = Context.CharTy;
324  break;
325 
327  NumberType = Context.getWideCharType();
328  break;
329 
331  NumberType = Context.Char16Ty;
332  break;
333 
335  NumberType = Context.Char32Ty;
336  break;
337  }
338  }
339 
340  // Look for the appropriate method within NSNumber.
341  // Construct the literal.
342  SourceRange NR(Number->getSourceRange());
343  ObjCMethodDecl *Method = getNSNumberFactoryMethod(*this, AtLoc, NumberType,
344  true, NR);
345  if (!Method)
346  return ExprError();
347 
348  // Convert the number to the type that the parameter expects.
349  ParmVarDecl *ParamDecl = Method->parameters()[0];
351  ParamDecl);
352  ExprResult ConvertedNumber = PerformCopyInitialization(Entity,
353  SourceLocation(),
354  Number);
355  if (ConvertedNumber.isInvalid())
356  return ExprError();
357  Number = ConvertedNumber.get();
358 
359  // Use the effective source range of the literal, including the leading '@'.
360  return MaybeBindToTemporary(
361  new (Context) ObjCBoxedExpr(Number, NSNumberPointer, Method,
362  SourceRange(AtLoc, NR.getEnd())));
363 }
364 
366  SourceLocation ValueLoc,
367  bool Value) {
368  ExprResult Inner;
369  if (getLangOpts().CPlusPlus) {
370  Inner = ActOnCXXBoolLiteral(ValueLoc, Value? tok::kw_true : tok::kw_false);
371  } else {
372  // C doesn't actually have a way to represent literal values of type
373  // _Bool. So, we'll use 0/1 and implicit cast to _Bool.
374  Inner = ActOnIntegerConstant(ValueLoc, Value? 1 : 0);
375  Inner = ImpCastExprToType(Inner.get(), Context.BoolTy,
376  CK_IntegralToBoolean);
377  }
378 
379  return BuildObjCNumericLiteral(AtLoc, Inner.get());
380 }
381 
382 /// \brief Check that the given expression is a valid element of an Objective-C
383 /// collection literal.
385  QualType T,
386  bool ArrayLiteral = false) {
387  // If the expression is type-dependent, there's nothing for us to do.
388  if (Element->isTypeDependent())
389  return Element;
390 
391  ExprResult Result = S.CheckPlaceholderExpr(Element);
392  if (Result.isInvalid())
393  return ExprError();
394  Element = Result.get();
395 
396  // In C++, check for an implicit conversion to an Objective-C object pointer
397  // type.
398  if (S.getLangOpts().CPlusPlus && Element->getType()->isRecordType()) {
399  InitializedEntity Entity
401  /*Consumed=*/false);
404  SourceLocation());
405  InitializationSequence Seq(S, Entity, Kind, Element);
406  if (!Seq.Failed())
407  return Seq.Perform(S, Entity, Kind, Element);
408  }
409 
410  Expr *OrigElement = Element;
411 
412  // Perform lvalue-to-rvalue conversion.
413  Result = S.DefaultLvalueConversion(Element);
414  if (Result.isInvalid())
415  return ExprError();
416  Element = Result.get();
417 
418  // Make sure that we have an Objective-C pointer type or block.
419  if (!Element->getType()->isObjCObjectPointerType() &&
420  !Element->getType()->isBlockPointerType()) {
421  bool Recovered = false;
422 
423  // If this is potentially an Objective-C numeric literal, add the '@'.
424  if (isa<IntegerLiteral>(OrigElement) ||
425  isa<CharacterLiteral>(OrigElement) ||
426  isa<FloatingLiteral>(OrigElement) ||
427  isa<ObjCBoolLiteralExpr>(OrigElement) ||
428  isa<CXXBoolLiteralExpr>(OrigElement)) {
429  if (S.NSAPIObj->getNSNumberFactoryMethodKind(OrigElement->getType())) {
430  int Which = isa<CharacterLiteral>(OrigElement) ? 1
431  : (isa<CXXBoolLiteralExpr>(OrigElement) ||
432  isa<ObjCBoolLiteralExpr>(OrigElement)) ? 2
433  : 3;
434 
435  S.Diag(OrigElement->getLocStart(), diag::err_box_literal_collection)
436  << Which << OrigElement->getSourceRange()
437  << FixItHint::CreateInsertion(OrigElement->getLocStart(), "@");
438 
439  Result = S.BuildObjCNumericLiteral(OrigElement->getLocStart(),
440  OrigElement);
441  if (Result.isInvalid())
442  return ExprError();
443 
444  Element = Result.get();
445  Recovered = true;
446  }
447  }
448  // If this is potentially an Objective-C string literal, add the '@'.
449  else if (StringLiteral *String = dyn_cast<StringLiteral>(OrigElement)) {
450  if (String->isAscii()) {
451  S.Diag(OrigElement->getLocStart(), diag::err_box_literal_collection)
452  << 0 << OrigElement->getSourceRange()
453  << FixItHint::CreateInsertion(OrigElement->getLocStart(), "@");
454 
455  Result = S.BuildObjCStringLiteral(OrigElement->getLocStart(), String);
456  if (Result.isInvalid())
457  return ExprError();
458 
459  Element = Result.get();
460  Recovered = true;
461  }
462  }
463 
464  if (!Recovered) {
465  S.Diag(Element->getLocStart(), diag::err_invalid_collection_element)
466  << Element->getType();
467  return ExprError();
468  }
469  }
470  if (ArrayLiteral)
471  if (ObjCStringLiteral *getString =
472  dyn_cast<ObjCStringLiteral>(OrigElement)) {
473  if (StringLiteral *SL = getString->getString()) {
474  unsigned numConcat = SL->getNumConcatenated();
475  if (numConcat > 1) {
476  // Only warn if the concatenated string doesn't come from a macro.
477  bool hasMacro = false;
478  for (unsigned i = 0; i < numConcat ; ++i)
479  if (SL->getStrTokenLoc(i).isMacroID()) {
480  hasMacro = true;
481  break;
482  }
483  if (!hasMacro)
484  S.Diag(Element->getLocStart(),
485  diag::warn_concatenated_nsarray_literal)
486  << Element->getType();
487  }
488  }
489  }
490 
491  // Make sure that the element has the type that the container factory
492  // function expects.
493  return S.PerformCopyInitialization(
495  /*Consumed=*/false),
496  Element->getLocStart(), Element);
497 }
498 
500  if (ValueExpr->isTypeDependent()) {
501  ObjCBoxedExpr *BoxedExpr =
502  new (Context) ObjCBoxedExpr(ValueExpr, Context.DependentTy, nullptr, SR);
503  return BoxedExpr;
504  }
505  ObjCMethodDecl *BoxingMethod = nullptr;
506  QualType BoxedType;
507  // Convert the expression to an RValue, so we can check for pointer types...
508  ExprResult RValue = DefaultFunctionArrayLvalueConversion(ValueExpr);
509  if (RValue.isInvalid()) {
510  return ExprError();
511  }
512  SourceLocation Loc = SR.getBegin();
513  ValueExpr = RValue.get();
514  QualType ValueType(ValueExpr->getType());
515  if (const PointerType *PT = ValueType->getAs<PointerType>()) {
516  QualType PointeeType = PT->getPointeeType();
517  if (Context.hasSameUnqualifiedType(PointeeType, Context.CharTy)) {
518 
519  if (!NSStringDecl) {
520  NSStringDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
522  if (!NSStringDecl) {
523  return ExprError();
524  }
525  QualType NSStringObject = Context.getObjCInterfaceType(NSStringDecl);
526  NSStringPointer = Context.getObjCObjectPointerType(NSStringObject);
527  }
528 
529  if (!StringWithUTF8StringMethod) {
530  IdentifierInfo *II = &Context.Idents.get("stringWithUTF8String");
531  Selector stringWithUTF8String = Context.Selectors.getUnarySelector(II);
532 
533  // Look for the appropriate method within NSString.
534  BoxingMethod = NSStringDecl->lookupClassMethod(stringWithUTF8String);
535  if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) {
536  // Debugger needs to work even if NSString hasn't been defined.
537  TypeSourceInfo *ReturnTInfo = nullptr;
539  Context, SourceLocation(), SourceLocation(), stringWithUTF8String,
540  NSStringPointer, ReturnTInfo, NSStringDecl,
541  /*isInstance=*/false, /*isVariadic=*/false,
542  /*isPropertyAccessor=*/false,
543  /*isImplicitlyDeclared=*/true,
544  /*isDefined=*/false, ObjCMethodDecl::Required,
545  /*HasRelatedResultType=*/false);
546  QualType ConstCharType = Context.CharTy.withConst();
547  ParmVarDecl *value =
548  ParmVarDecl::Create(Context, M,
550  &Context.Idents.get("value"),
551  Context.getPointerType(ConstCharType),
552  /*TInfo=*/nullptr,
553  SC_None, nullptr);
554  M->setMethodParams(Context, value, None);
555  BoxingMethod = M;
556  }
557 
558  if (!validateBoxingMethod(*this, Loc, NSStringDecl,
559  stringWithUTF8String, BoxingMethod))
560  return ExprError();
561 
562  StringWithUTF8StringMethod = BoxingMethod;
563  }
564 
565  BoxingMethod = StringWithUTF8StringMethod;
566  BoxedType = NSStringPointer;
567  // Transfer the nullability from method's return type.
569  BoxingMethod->getReturnType()->getNullability(Context);
570  if (Nullability)
571  BoxedType = Context.getAttributedType(
572  AttributedType::getNullabilityAttrKind(*Nullability), BoxedType,
573  BoxedType);
574  }
575  } else if (ValueType->isBuiltinType()) {
576  // The other types we support are numeric, char and BOOL/bool. We could also
577  // provide limited support for structure types, such as NSRange, NSRect, and
578  // NSSize. See NSValue (NSValueGeometryExtensions) in <Foundation/NSGeometry.h>
579  // for more details.
580 
581  // Check for a top-level character literal.
582  if (const CharacterLiteral *Char =
583  dyn_cast<CharacterLiteral>(ValueExpr->IgnoreParens())) {
584  // In C, character literals have type 'int'. That's not the type we want
585  // to use to determine the Objective-c literal kind.
586  switch (Char->getKind()) {
589  ValueType = Context.CharTy;
590  break;
591 
593  ValueType = Context.getWideCharType();
594  break;
595 
597  ValueType = Context.Char16Ty;
598  break;
599 
601  ValueType = Context.Char32Ty;
602  break;
603  }
604  }
605  // FIXME: Do I need to do anything special with BoolTy expressions?
606 
607  // Look for the appropriate method within NSNumber.
608  BoxingMethod = getNSNumberFactoryMethod(*this, Loc, ValueType);
609  BoxedType = NSNumberPointer;
610  } else if (const EnumType *ET = ValueType->getAs<EnumType>()) {
611  if (!ET->getDecl()->isComplete()) {
612  Diag(Loc, diag::err_objc_incomplete_boxed_expression_type)
613  << ValueType << ValueExpr->getSourceRange();
614  return ExprError();
615  }
616 
617  BoxingMethod = getNSNumberFactoryMethod(*this, Loc,
618  ET->getDecl()->getIntegerType());
619  BoxedType = NSNumberPointer;
620  } else if (ValueType->isObjCBoxableRecordType()) {
621  // Support for structure types, that marked as objc_boxable
622  // struct __attribute__((objc_boxable)) s { ... };
623 
624  // Look up the NSValue class, if we haven't done so already. It's cached
625  // in the Sema instance.
626  if (!NSValueDecl) {
627  NSValueDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
629  if (!NSValueDecl) {
630  return ExprError();
631  }
632 
633  // generate the pointer to NSValue type.
634  QualType NSValueObject = Context.getObjCInterfaceType(NSValueDecl);
635  NSValuePointer = Context.getObjCObjectPointerType(NSValueObject);
636  }
637 
638  if (!ValueWithBytesObjCTypeMethod) {
639  IdentifierInfo *II[] = {
640  &Context.Idents.get("valueWithBytes"),
641  &Context.Idents.get("objCType")
642  };
643  Selector ValueWithBytesObjCType = Context.Selectors.getSelector(2, II);
644 
645  // Look for the appropriate method within NSValue.
646  BoxingMethod = NSValueDecl->lookupClassMethod(ValueWithBytesObjCType);
647  if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) {
648  // Debugger needs to work even if NSValue hasn't been defined.
649  TypeSourceInfo *ReturnTInfo = nullptr;
651  Context,
652  SourceLocation(),
653  SourceLocation(),
654  ValueWithBytesObjCType,
655  NSValuePointer,
656  ReturnTInfo,
657  NSValueDecl,
658  /*isInstance=*/false,
659  /*isVariadic=*/false,
660  /*isPropertyAccessor=*/false,
661  /*isImplicitlyDeclared=*/true,
662  /*isDefined=*/false,
664  /*HasRelatedResultType=*/false);
665 
667 
668  ParmVarDecl *bytes =
669  ParmVarDecl::Create(Context, M,
671  &Context.Idents.get("bytes"),
672  Context.VoidPtrTy.withConst(),
673  /*TInfo=*/nullptr,
674  SC_None, nullptr);
675  Params.push_back(bytes);
676 
677  QualType ConstCharType = Context.CharTy.withConst();
678  ParmVarDecl *type =
679  ParmVarDecl::Create(Context, M,
681  &Context.Idents.get("type"),
682  Context.getPointerType(ConstCharType),
683  /*TInfo=*/nullptr,
684  SC_None, nullptr);
685  Params.push_back(type);
686 
687  M->setMethodParams(Context, Params, None);
688  BoxingMethod = M;
689  }
690 
691  if (!validateBoxingMethod(*this, Loc, NSValueDecl,
692  ValueWithBytesObjCType, BoxingMethod))
693  return ExprError();
694 
695  ValueWithBytesObjCTypeMethod = BoxingMethod;
696  }
697 
698  if (!ValueType.isTriviallyCopyableType(Context)) {
699  Diag(Loc, diag::err_objc_non_trivially_copyable_boxed_expression_type)
700  << ValueType << ValueExpr->getSourceRange();
701  return ExprError();
702  }
703 
704  BoxingMethod = ValueWithBytesObjCTypeMethod;
705  BoxedType = NSValuePointer;
706  }
707 
708  if (!BoxingMethod) {
709  Diag(Loc, diag::err_objc_illegal_boxed_expression_type)
710  << ValueType << ValueExpr->getSourceRange();
711  return ExprError();
712  }
713 
714  DiagnoseUseOfDecl(BoxingMethod, Loc);
715 
716  ExprResult ConvertedValueExpr;
717  if (ValueType->isObjCBoxableRecordType()) {
719  ConvertedValueExpr = PerformCopyInitialization(IE, ValueExpr->getExprLoc(),
720  ValueExpr);
721  } else {
722  // Convert the expression to the type that the parameter requires.
723  ParmVarDecl *ParamDecl = BoxingMethod->parameters()[0];
725  ParamDecl);
726  ConvertedValueExpr = PerformCopyInitialization(IE, SourceLocation(),
727  ValueExpr);
728  }
729 
730  if (ConvertedValueExpr.isInvalid())
731  return ExprError();
732  ValueExpr = ConvertedValueExpr.get();
733 
734  ObjCBoxedExpr *BoxedExpr =
735  new (Context) ObjCBoxedExpr(ValueExpr, BoxedType,
736  BoxingMethod, SR);
737  return MaybeBindToTemporary(BoxedExpr);
738 }
739 
740 /// Build an ObjC subscript pseudo-object expression, given that
741 /// that's supported by the runtime.
743  Expr *IndexExpr,
744  ObjCMethodDecl *getterMethod,
745  ObjCMethodDecl *setterMethod) {
746  assert(!LangOpts.isSubscriptPointerArithmetic());
747 
748  // We can't get dependent types here; our callers should have
749  // filtered them out.
750  assert((!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) &&
751  "base or index cannot have dependent type here");
752 
753  // Filter out placeholders in the index. In theory, overloads could
754  // be preserved here, although that might not actually work correctly.
755  ExprResult Result = CheckPlaceholderExpr(IndexExpr);
756  if (Result.isInvalid())
757  return ExprError();
758  IndexExpr = Result.get();
759 
760  // Perform lvalue-to-rvalue conversion on the base.
761  Result = DefaultLvalueConversion(BaseExpr);
762  if (Result.isInvalid())
763  return ExprError();
764  BaseExpr = Result.get();
765 
766  // Build the pseudo-object expression.
767  return new (Context) ObjCSubscriptRefExpr(
768  BaseExpr, IndexExpr, Context.PseudoObjectTy, VK_LValue, OK_ObjCSubscript,
769  getterMethod, setterMethod, RB);
770 }
771 
773  SourceLocation Loc = SR.getBegin();
774 
775  if (!NSArrayDecl) {
776  NSArrayDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
778  if (!NSArrayDecl) {
779  return ExprError();
780  }
781  }
782 
783  // Find the arrayWithObjects:count: method, if we haven't done so already.
784  QualType IdT = Context.getObjCIdType();
785  if (!ArrayWithObjectsMethod) {
786  Selector
787  Sel = NSAPIObj->getNSArraySelector(NSAPI::NSArr_arrayWithObjectsCount);
788  ObjCMethodDecl *Method = NSArrayDecl->lookupClassMethod(Sel);
789  if (!Method && getLangOpts().DebuggerObjCLiteral) {
790  TypeSourceInfo *ReturnTInfo = nullptr;
791  Method = ObjCMethodDecl::Create(
792  Context, SourceLocation(), SourceLocation(), Sel, IdT, ReturnTInfo,
793  Context.getTranslationUnitDecl(), false /*Instance*/,
794  false /*isVariadic*/,
795  /*isPropertyAccessor=*/false,
796  /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
797  ObjCMethodDecl::Required, false);
799  ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
800  SourceLocation(),
801  SourceLocation(),
802  &Context.Idents.get("objects"),
803  Context.getPointerType(IdT),
804  /*TInfo=*/nullptr,
805  SC_None, nullptr);
806  Params.push_back(objects);
807  ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
808  SourceLocation(),
809  SourceLocation(),
810  &Context.Idents.get("cnt"),
811  Context.UnsignedLongTy,
812  /*TInfo=*/nullptr, SC_None,
813  nullptr);
814  Params.push_back(cnt);
815  Method->setMethodParams(Context, Params, None);
816  }
817 
818  if (!validateBoxingMethod(*this, Loc, NSArrayDecl, Sel, Method))
819  return ExprError();
820 
821  // Dig out the type that all elements should be converted to.
822  QualType T = Method->parameters()[0]->getType();
823  const PointerType *PtrT = T->getAs<PointerType>();
824  if (!PtrT ||
825  !Context.hasSameUnqualifiedType(PtrT->getPointeeType(), IdT)) {
826  Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
827  << Sel;
828  Diag(Method->parameters()[0]->getLocation(),
829  diag::note_objc_literal_method_param)
830  << 0 << T
831  << Context.getPointerType(IdT.withConst());
832  return ExprError();
833  }
834 
835  // Check that the 'count' parameter is integral.
836  if (!Method->parameters()[1]->getType()->isIntegerType()) {
837  Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
838  << Sel;
839  Diag(Method->parameters()[1]->getLocation(),
840  diag::note_objc_literal_method_param)
841  << 1
842  << Method->parameters()[1]->getType()
843  << "integral";
844  return ExprError();
845  }
846 
847  // We've found a good +arrayWithObjects:count: method. Save it!
848  ArrayWithObjectsMethod = Method;
849  }
850 
851  QualType ObjectsType = ArrayWithObjectsMethod->parameters()[0]->getType();
852  QualType RequiredType = ObjectsType->castAs<PointerType>()->getPointeeType();
853 
854  // Check that each of the elements provided is valid in a collection literal,
855  // performing conversions as necessary.
856  Expr **ElementsBuffer = Elements.data();
857  for (unsigned I = 0, N = Elements.size(); I != N; ++I) {
859  ElementsBuffer[I],
860  RequiredType, true);
861  if (Converted.isInvalid())
862  return ExprError();
863 
864  ElementsBuffer[I] = Converted.get();
865  }
866 
867  QualType Ty
868  = Context.getObjCObjectPointerType(
869  Context.getObjCInterfaceType(NSArrayDecl));
870 
871  return MaybeBindToTemporary(
872  ObjCArrayLiteral::Create(Context, Elements, Ty,
873  ArrayWithObjectsMethod, SR));
874 }
875 
878  SourceLocation Loc = SR.getBegin();
879 
880  if (!NSDictionaryDecl) {
881  NSDictionaryDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
883  if (!NSDictionaryDecl) {
884  return ExprError();
885  }
886  }
887 
888  // Find the dictionaryWithObjects:forKeys:count: method, if we haven't done
889  // so already.
890  QualType IdT = Context.getObjCIdType();
891  if (!DictionaryWithObjectsMethod) {
892  Selector Sel = NSAPIObj->getNSDictionarySelector(
894  ObjCMethodDecl *Method = NSDictionaryDecl->lookupClassMethod(Sel);
895  if (!Method && getLangOpts().DebuggerObjCLiteral) {
896  Method = ObjCMethodDecl::Create(Context,
897  SourceLocation(), SourceLocation(), Sel,
898  IdT,
899  nullptr /*TypeSourceInfo */,
900  Context.getTranslationUnitDecl(),
901  false /*Instance*/, false/*isVariadic*/,
902  /*isPropertyAccessor=*/false,
903  /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
905  false);
907  ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
908  SourceLocation(),
909  SourceLocation(),
910  &Context.Idents.get("objects"),
911  Context.getPointerType(IdT),
912  /*TInfo=*/nullptr, SC_None,
913  nullptr);
914  Params.push_back(objects);
915  ParmVarDecl *keys = ParmVarDecl::Create(Context, Method,
916  SourceLocation(),
917  SourceLocation(),
918  &Context.Idents.get("keys"),
919  Context.getPointerType(IdT),
920  /*TInfo=*/nullptr, SC_None,
921  nullptr);
922  Params.push_back(keys);
923  ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
924  SourceLocation(),
925  SourceLocation(),
926  &Context.Idents.get("cnt"),
927  Context.UnsignedLongTy,
928  /*TInfo=*/nullptr, SC_None,
929  nullptr);
930  Params.push_back(cnt);
931  Method->setMethodParams(Context, Params, None);
932  }
933 
934  if (!validateBoxingMethod(*this, SR.getBegin(), NSDictionaryDecl, Sel,
935  Method))
936  return ExprError();
937 
938  // Dig out the type that all values should be converted to.
939  QualType ValueT = Method->parameters()[0]->getType();
940  const PointerType *PtrValue = ValueT->getAs<PointerType>();
941  if (!PtrValue ||
942  !Context.hasSameUnqualifiedType(PtrValue->getPointeeType(), IdT)) {
943  Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
944  << Sel;
945  Diag(Method->parameters()[0]->getLocation(),
946  diag::note_objc_literal_method_param)
947  << 0 << ValueT
948  << Context.getPointerType(IdT.withConst());
949  return ExprError();
950  }
951 
952  // Dig out the type that all keys should be converted to.
953  QualType KeyT = Method->parameters()[1]->getType();
954  const PointerType *PtrKey = KeyT->getAs<PointerType>();
955  if (!PtrKey ||
956  !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
957  IdT)) {
958  bool err = true;
959  if (PtrKey) {
960  if (QIDNSCopying.isNull()) {
961  // key argument of selector is id<NSCopying>?
962  if (ObjCProtocolDecl *NSCopyingPDecl =
963  LookupProtocol(&Context.Idents.get("NSCopying"), SR.getBegin())) {
964  ObjCProtocolDecl *PQ[] = {NSCopyingPDecl};
965  QIDNSCopying =
966  Context.getObjCObjectType(Context.ObjCBuiltinIdTy, { },
967  llvm::makeArrayRef(
968  (ObjCProtocolDecl**) PQ,
969  1),
970  false);
971  QIDNSCopying = Context.getObjCObjectPointerType(QIDNSCopying);
972  }
973  }
974  if (!QIDNSCopying.isNull())
975  err = !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
976  QIDNSCopying);
977  }
978 
979  if (err) {
980  Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
981  << Sel;
982  Diag(Method->parameters()[1]->getLocation(),
983  diag::note_objc_literal_method_param)
984  << 1 << KeyT
985  << Context.getPointerType(IdT.withConst());
986  return ExprError();
987  }
988  }
989 
990  // Check that the 'count' parameter is integral.
991  QualType CountType = Method->parameters()[2]->getType();
992  if (!CountType->isIntegerType()) {
993  Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
994  << Sel;
995  Diag(Method->parameters()[2]->getLocation(),
996  diag::note_objc_literal_method_param)
997  << 2 << CountType
998  << "integral";
999  return ExprError();
1000  }
1001 
1002  // We've found a good +dictionaryWithObjects:keys:count: method; save it!
1003  DictionaryWithObjectsMethod = Method;
1004  }
1005 
1006  QualType ValuesT = DictionaryWithObjectsMethod->parameters()[0]->getType();
1007  QualType ValueT = ValuesT->castAs<PointerType>()->getPointeeType();
1008  QualType KeysT = DictionaryWithObjectsMethod->parameters()[1]->getType();
1009  QualType KeyT = KeysT->castAs<PointerType>()->getPointeeType();
1010 
1011  // Check that each of the keys and values provided is valid in a collection
1012  // literal, performing conversions as necessary.
1013  bool HasPackExpansions = false;
1014  for (ObjCDictionaryElement &Element : Elements) {
1015  // Check the key.
1016  ExprResult Key = CheckObjCCollectionLiteralElement(*this, Element.Key,
1017  KeyT);
1018  if (Key.isInvalid())
1019  return ExprError();
1020 
1021  // Check the value.
1023  = CheckObjCCollectionLiteralElement(*this, Element.Value, ValueT);
1024  if (Value.isInvalid())
1025  return ExprError();
1026 
1027  Element.Key = Key.get();
1028  Element.Value = Value.get();
1029 
1030  if (Element.EllipsisLoc.isInvalid())
1031  continue;
1032 
1033  if (!Element.Key->containsUnexpandedParameterPack() &&
1034  !Element.Value->containsUnexpandedParameterPack()) {
1035  Diag(Element.EllipsisLoc,
1036  diag::err_pack_expansion_without_parameter_packs)
1037  << SourceRange(Element.Key->getLocStart(),
1038  Element.Value->getLocEnd());
1039  return ExprError();
1040  }
1041 
1042  HasPackExpansions = true;
1043  }
1044 
1045  QualType Ty
1046  = Context.getObjCObjectPointerType(
1047  Context.getObjCInterfaceType(NSDictionaryDecl));
1048  return MaybeBindToTemporary(ObjCDictionaryLiteral::Create(
1049  Context, Elements, HasPackExpansions, Ty,
1050  DictionaryWithObjectsMethod, SR));
1051 }
1052 
1054  TypeSourceInfo *EncodedTypeInfo,
1055  SourceLocation RParenLoc) {
1056  QualType EncodedType = EncodedTypeInfo->getType();
1057  QualType StrTy;
1058  if (EncodedType->isDependentType())
1059  StrTy = Context.DependentTy;
1060  else {
1061  if (!EncodedType->getAsArrayTypeUnsafe() && //// Incomplete array is handled.
1062  !EncodedType->isVoidType()) // void is handled too.
1063  if (RequireCompleteType(AtLoc, EncodedType,
1064  diag::err_incomplete_type_objc_at_encode,
1065  EncodedTypeInfo->getTypeLoc()))
1066  return ExprError();
1067 
1068  std::string Str;
1069  QualType NotEncodedT;
1070  Context.getObjCEncodingForType(EncodedType, Str, nullptr, &NotEncodedT);
1071  if (!NotEncodedT.isNull())
1072  Diag(AtLoc, diag::warn_incomplete_encoded_type)
1073  << EncodedType << NotEncodedT;
1074 
1075  // The type of @encode is the same as the type of the corresponding string,
1076  // which is an array type.
1077  StrTy = Context.CharTy;
1078  // A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
1079  if (getLangOpts().CPlusPlus || getLangOpts().ConstStrings)
1080  StrTy.addConst();
1081  StrTy = Context.getConstantArrayType(StrTy, llvm::APInt(32, Str.size()+1),
1082  ArrayType::Normal, 0);
1083  }
1084 
1085  return new (Context) ObjCEncodeExpr(StrTy, EncodedTypeInfo, AtLoc, RParenLoc);
1086 }
1087 
1089  SourceLocation EncodeLoc,
1090  SourceLocation LParenLoc,
1091  ParsedType ty,
1092  SourceLocation RParenLoc) {
1093  // FIXME: Preserve type source info ?
1094  TypeSourceInfo *TInfo;
1095  QualType EncodedType = GetTypeFromParser(ty, &TInfo);
1096  if (!TInfo)
1097  TInfo = Context.getTrivialTypeSourceInfo(EncodedType,
1098  getLocForEndOfToken(LParenLoc));
1099 
1100  return BuildObjCEncodeExpression(AtLoc, TInfo, RParenLoc);
1101 }
1102 
1104  SourceLocation AtLoc,
1105  SourceLocation LParenLoc,
1106  SourceLocation RParenLoc,
1107  ObjCMethodDecl *Method,
1108  ObjCMethodList &MethList) {
1109  ObjCMethodList *M = &MethList;
1110  bool Warned = false;
1111  for (M = M->getNext(); M; M=M->getNext()) {
1112  ObjCMethodDecl *MatchingMethodDecl = M->getMethod();
1113  if (MatchingMethodDecl == Method ||
1114  isa<ObjCImplDecl>(MatchingMethodDecl->getDeclContext()) ||
1115  MatchingMethodDecl->getSelector() != Method->getSelector())
1116  continue;
1117  if (!S.MatchTwoMethodDeclarations(Method,
1118  MatchingMethodDecl, Sema::MMS_loose)) {
1119  if (!Warned) {
1120  Warned = true;
1121  S.Diag(AtLoc, diag::warn_multiple_selectors)
1122  << Method->getSelector() << FixItHint::CreateInsertion(LParenLoc, "(")
1123  << FixItHint::CreateInsertion(RParenLoc, ")");
1124  S.Diag(Method->getLocation(), diag::note_method_declared_at)
1125  << Method->getDeclName();
1126  }
1127  S.Diag(MatchingMethodDecl->getLocation(), diag::note_method_declared_at)
1128  << MatchingMethodDecl->getDeclName();
1129  }
1130  }
1131  return Warned;
1132 }
1133 
1135  ObjCMethodDecl *Method,
1136  SourceLocation LParenLoc,
1137  SourceLocation RParenLoc,
1138  bool WarnMultipleSelectors) {
1139  if (!WarnMultipleSelectors ||
1140  S.Diags.isIgnored(diag::warn_multiple_selectors, SourceLocation()))
1141  return;
1142  bool Warned = false;
1143  for (Sema::GlobalMethodPool::iterator b = S.MethodPool.begin(),
1144  e = S.MethodPool.end(); b != e; b++) {
1145  // first, instance methods
1146  ObjCMethodList &InstMethList = b->second.first;
1147  if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc,
1148  Method, InstMethList))
1149  Warned = true;
1150 
1151  // second, class methods
1152  ObjCMethodList &ClsMethList = b->second.second;
1153  if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc,
1154  Method, ClsMethList) || Warned)
1155  return;
1156  }
1157 }
1158 
1160  SourceLocation AtLoc,
1161  SourceLocation SelLoc,
1162  SourceLocation LParenLoc,
1163  SourceLocation RParenLoc,
1164  bool WarnMultipleSelectors) {
1165  ObjCMethodDecl *Method = LookupInstanceMethodInGlobalPool(Sel,
1166  SourceRange(LParenLoc, RParenLoc));
1167  if (!Method)
1168  Method = LookupFactoryMethodInGlobalPool(Sel,
1169  SourceRange(LParenLoc, RParenLoc));
1170  if (!Method) {
1171  if (const ObjCMethodDecl *OM = SelectorsForTypoCorrection(Sel)) {
1172  Selector MatchedSel = OM->getSelector();
1173  SourceRange SelectorRange(LParenLoc.getLocWithOffset(1),
1174  RParenLoc.getLocWithOffset(-1));
1175  Diag(SelLoc, diag::warn_undeclared_selector_with_typo)
1176  << Sel << MatchedSel
1177  << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1178 
1179  } else
1180  Diag(SelLoc, diag::warn_undeclared_selector) << Sel;
1181  } else
1182  DiagnoseMismatchedSelectors(*this, AtLoc, Method, LParenLoc, RParenLoc,
1183  WarnMultipleSelectors);
1184 
1185  if (Method &&
1187  !getSourceManager().isInSystemHeader(Method->getLocation()))
1188  ReferencedSelectors.insert(std::make_pair(Sel, AtLoc));
1189 
1190  // In ARC, forbid the user from using @selector for
1191  // retain/release/autorelease/dealloc/retainCount.
1192  if (getLangOpts().ObjCAutoRefCount) {
1193  switch (Sel.getMethodFamily()) {
1194  case OMF_retain:
1195  case OMF_release:
1196  case OMF_autorelease:
1197  case OMF_retainCount:
1198  case OMF_dealloc:
1199  Diag(AtLoc, diag::err_arc_illegal_selector) <<
1200  Sel << SourceRange(LParenLoc, RParenLoc);
1201  break;
1202 
1203  case OMF_None:
1204  case OMF_alloc:
1205  case OMF_copy:
1206  case OMF_finalize:
1207  case OMF_init:
1208  case OMF_mutableCopy:
1209  case OMF_new:
1210  case OMF_self:
1211  case OMF_initialize:
1212  case OMF_performSelector:
1213  break;
1214  }
1215  }
1216  QualType Ty = Context.getObjCSelType();
1217  return new (Context) ObjCSelectorExpr(Ty, Sel, AtLoc, RParenLoc);
1218 }
1219 
1221  SourceLocation AtLoc,
1222  SourceLocation ProtoLoc,
1223  SourceLocation LParenLoc,
1224  SourceLocation ProtoIdLoc,
1225  SourceLocation RParenLoc) {
1226  ObjCProtocolDecl* PDecl = LookupProtocol(ProtocolId, ProtoIdLoc);
1227  if (!PDecl) {
1228  Diag(ProtoLoc, diag::err_undeclared_protocol) << ProtocolId;
1229  return true;
1230  }
1231  if (PDecl->hasDefinition())
1232  PDecl = PDecl->getDefinition();
1233 
1234  QualType Ty = Context.getObjCProtoType();
1235  if (Ty.isNull())
1236  return true;
1237  Ty = Context.getObjCObjectPointerType(Ty);
1238  return new (Context) ObjCProtocolExpr(Ty, PDecl, AtLoc, ProtoIdLoc, RParenLoc);
1239 }
1240 
1241 /// Try to capture an implicit reference to 'self'.
1243  DeclContext *DC = getFunctionLevelDeclContext();
1244 
1245  // If we're not in an ObjC method, error out. Note that, unlike the
1246  // C++ case, we don't require an instance method --- class methods
1247  // still have a 'self', and we really do still need to capture it!
1248  ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(DC);
1249  if (!method)
1250  return nullptr;
1251 
1252  tryCaptureVariable(method->getSelfDecl(), Loc);
1253 
1254  return method;
1255 }
1256 
1258  QualType origType = T;
1259  if (auto nullability = AttributedType::stripOuterNullability(T)) {
1260  if (T == Context.getObjCInstanceType()) {
1261  return Context.getAttributedType(
1263  Context.getObjCIdType(),
1264  Context.getObjCIdType());
1265  }
1266 
1267  return origType;
1268  }
1269 
1270  if (T == Context.getObjCInstanceType())
1271  return Context.getObjCIdType();
1272 
1273  return origType;
1274 }
1275 
1276 /// Determine the result type of a message send based on the receiver type,
1277 /// method, and the kind of message send.
1278 ///
1279 /// This is the "base" result type, which will still need to be adjusted
1280 /// to account for nullability.
1282  QualType ReceiverType,
1283  ObjCMethodDecl *Method,
1284  bool isClassMessage,
1285  bool isSuperMessage) {
1286  assert(Method && "Must have a method");
1287  if (!Method->hasRelatedResultType())
1288  return Method->getSendResultType(ReceiverType);
1289 
1290  ASTContext &Context = S.Context;
1291 
1292  // Local function that transfers the nullability of the method's
1293  // result type to the returned result.
1294  auto transferNullability = [&](QualType type) -> QualType {
1295  // If the method's result type has nullability, extract it.
1296  if (auto nullability = Method->getSendResultType(ReceiverType)
1297  ->getNullability(Context)){
1298  // Strip off any outer nullability sugar from the provided type.
1300 
1301  // Form a new attributed type using the method result type's nullability.
1302  return Context.getAttributedType(
1304  type,
1305  type);
1306  }
1307 
1308  return type;
1309  };
1310 
1311  // If a method has a related return type:
1312  // - if the method found is an instance method, but the message send
1313  // was a class message send, T is the declared return type of the method
1314  // found
1315  if (Method->isInstanceMethod() && isClassMessage)
1316  return stripObjCInstanceType(Context,
1317  Method->getSendResultType(ReceiverType));
1318 
1319  // - if the receiver is super, T is a pointer to the class of the
1320  // enclosing method definition
1321  if (isSuperMessage) {
1322  if (ObjCMethodDecl *CurMethod = S.getCurMethodDecl())
1323  if (ObjCInterfaceDecl *Class = CurMethod->getClassInterface()) {
1324  return transferNullability(
1325  Context.getObjCObjectPointerType(
1326  Context.getObjCInterfaceType(Class)));
1327  }
1328  }
1329 
1330  // - if the receiver is the name of a class U, T is a pointer to U
1331  if (ReceiverType->getAsObjCInterfaceType())
1332  return transferNullability(Context.getObjCObjectPointerType(ReceiverType));
1333  // - if the receiver is of type Class or qualified Class type,
1334  // T is the declared return type of the method.
1335  if (ReceiverType->isObjCClassType() ||
1336  ReceiverType->isObjCQualifiedClassType())
1337  return stripObjCInstanceType(Context,
1338  Method->getSendResultType(ReceiverType));
1339 
1340  // - if the receiver is id, qualified id, Class, or qualified Class, T
1341  // is the receiver type, otherwise
1342  // - T is the type of the receiver expression.
1343  return transferNullability(ReceiverType);
1344 }
1345 
1347  ObjCMethodDecl *Method,
1348  bool isClassMessage,
1349  bool isSuperMessage) {
1350  // Produce the result type.
1351  QualType resultType = getBaseMessageSendResultType(*this, ReceiverType,
1352  Method,
1353  isClassMessage,
1354  isSuperMessage);
1355 
1356  // If this is a class message, ignore the nullability of the receiver.
1357  if (isClassMessage)
1358  return resultType;
1359 
1360  // Map the nullability of the result into a table index.
1361  unsigned receiverNullabilityIdx = 0;
1362  if (auto nullability = ReceiverType->getNullability(Context))
1363  receiverNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1364 
1365  unsigned resultNullabilityIdx = 0;
1366  if (auto nullability = resultType->getNullability(Context))
1367  resultNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1368 
1369  // The table of nullability mappings, indexed by the receiver's nullability
1370  // and then the result type's nullability.
1371  static const uint8_t None = 0;
1372  static const uint8_t NonNull = 1;
1373  static const uint8_t Nullable = 2;
1374  static const uint8_t Unspecified = 3;
1375  static const uint8_t nullabilityMap[4][4] = {
1376  // None NonNull Nullable Unspecified
1377  /* None */ { None, None, Nullable, None },
1378  /* NonNull */ { None, NonNull, Nullable, Unspecified },
1379  /* Nullable */ { Nullable, Nullable, Nullable, Nullable },
1380  /* Unspecified */ { None, Unspecified, Nullable, Unspecified }
1381  };
1382 
1383  unsigned newResultNullabilityIdx
1384  = nullabilityMap[receiverNullabilityIdx][resultNullabilityIdx];
1385  if (newResultNullabilityIdx == resultNullabilityIdx)
1386  return resultType;
1387 
1388  // Strip off the existing nullability. This removes as little type sugar as
1389  // possible.
1390  do {
1391  if (auto attributed = dyn_cast<AttributedType>(resultType.getTypePtr())) {
1392  resultType = attributed->getModifiedType();
1393  } else {
1394  resultType = resultType.getDesugaredType(Context);
1395  }
1396  } while (resultType->getNullability(Context));
1397 
1398  // Add nullability back if needed.
1399  if (newResultNullabilityIdx > 0) {
1400  auto newNullability
1401  = static_cast<NullabilityKind>(newResultNullabilityIdx-1);
1402  return Context.getAttributedType(
1404  resultType, resultType);
1405  }
1406 
1407  return resultType;
1408 }
1409 
1410 /// Look for an ObjC method whose result type exactly matches the given type.
1411 static const ObjCMethodDecl *
1413  QualType instancetype) {
1414  if (MD->getReturnType() == instancetype)
1415  return MD;
1416 
1417  // For these purposes, a method in an @implementation overrides a
1418  // declaration in the @interface.
1419  if (const ObjCImplDecl *impl =
1420  dyn_cast<ObjCImplDecl>(MD->getDeclContext())) {
1421  const ObjCContainerDecl *iface;
1422  if (const ObjCCategoryImplDecl *catImpl =
1423  dyn_cast<ObjCCategoryImplDecl>(impl)) {
1424  iface = catImpl->getCategoryDecl();
1425  } else {
1426  iface = impl->getClassInterface();
1427  }
1428 
1429  const ObjCMethodDecl *ifaceMD =
1430  iface->getMethod(MD->getSelector(), MD->isInstanceMethod());
1431  if (ifaceMD) return findExplicitInstancetypeDeclarer(ifaceMD, instancetype);
1432  }
1433 
1435  MD->getOverriddenMethods(overrides);
1436  for (unsigned i = 0, e = overrides.size(); i != e; ++i) {
1437  if (const ObjCMethodDecl *result =
1438  findExplicitInstancetypeDeclarer(overrides[i], instancetype))
1439  return result;
1440  }
1441 
1442  return nullptr;
1443 }
1444 
1446  // Only complain if we're in an ObjC method and the required return
1447  // type doesn't match the method's declared return type.
1448  ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurContext);
1449  if (!MD || !MD->hasRelatedResultType() ||
1450  Context.hasSameUnqualifiedType(destType, MD->getReturnType()))
1451  return;
1452 
1453  // Look for a method overridden by this method which explicitly uses
1454  // 'instancetype'.
1455  if (const ObjCMethodDecl *overridden =
1457  SourceRange range = overridden->getReturnTypeSourceRange();
1458  SourceLocation loc = range.getBegin();
1459  if (loc.isInvalid())
1460  loc = overridden->getLocation();
1461  Diag(loc, diag::note_related_result_type_explicit)
1462  << /*current method*/ 1 << range;
1463  return;
1464  }
1465 
1466  // Otherwise, if we have an interesting method family, note that.
1467  // This should always trigger if the above didn't.
1468  if (ObjCMethodFamily family = MD->getMethodFamily())
1469  Diag(MD->getLocation(), diag::note_related_result_type_family)
1470  << /*current method*/ 1
1471  << family;
1472 }
1473 
1475  E = E->IgnoreParenImpCasts();
1476  const ObjCMessageExpr *MsgSend = dyn_cast<ObjCMessageExpr>(E);
1477  if (!MsgSend)
1478  return;
1479 
1480  const ObjCMethodDecl *Method = MsgSend->getMethodDecl();
1481  if (!Method)
1482  return;
1483 
1484  if (!Method->hasRelatedResultType())
1485  return;
1486 
1487  if (Context.hasSameUnqualifiedType(
1488  Method->getReturnType().getNonReferenceType(), MsgSend->getType()))
1489  return;
1490 
1491  if (!Context.hasSameUnqualifiedType(Method->getReturnType(),
1492  Context.getObjCInstanceType()))
1493  return;
1494 
1495  Diag(Method->getLocation(), diag::note_related_result_type_inferred)
1496  << Method->isInstanceMethod() << Method->getSelector()
1497  << MsgSend->getType();
1498 }
1499 
1501  MultiExprArg Args,
1502  Selector Sel,
1503  ArrayRef<SourceLocation> SelectorLocs,
1504  ObjCMethodDecl *Method,
1505  bool isClassMessage, bool isSuperMessage,
1506  SourceLocation lbrac, SourceLocation rbrac,
1507  SourceRange RecRange,
1508  QualType &ReturnType, ExprValueKind &VK) {
1509  SourceLocation SelLoc;
1510  if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
1511  SelLoc = SelectorLocs.front();
1512  else
1513  SelLoc = lbrac;
1514 
1515  if (!Method) {
1516  // Apply default argument promotion as for (C99 6.5.2.2p6).
1517  for (unsigned i = 0, e = Args.size(); i != e; i++) {
1518  if (Args[i]->isTypeDependent())
1519  continue;
1520 
1521  ExprResult result;
1522  if (getLangOpts().DebuggerSupport) {
1523  QualType paramTy; // ignored
1524  result = checkUnknownAnyArg(SelLoc, Args[i], paramTy);
1525  } else {
1526  result = DefaultArgumentPromotion(Args[i]);
1527  }
1528  if (result.isInvalid())
1529  return true;
1530  Args[i] = result.get();
1531  }
1532 
1533  unsigned DiagID;
1534  if (getLangOpts().ObjCAutoRefCount)
1535  DiagID = diag::err_arc_method_not_found;
1536  else
1537  DiagID = isClassMessage ? diag::warn_class_method_not_found
1538  : diag::warn_inst_method_not_found;
1539  if (!getLangOpts().DebuggerSupport) {
1540  const ObjCMethodDecl *OMD = SelectorsForTypoCorrection(Sel, ReceiverType);
1541  if (OMD && !OMD->isInvalidDecl()) {
1542  if (getLangOpts().ObjCAutoRefCount)
1543  DiagID = diag::err_method_not_found_with_typo;
1544  else
1545  DiagID = isClassMessage ? diag::warn_class_method_not_found_with_typo
1546  : diag::warn_instance_method_not_found_with_typo;
1547  Selector MatchedSel = OMD->getSelector();
1548  SourceRange SelectorRange(SelectorLocs.front(), SelectorLocs.back());
1549  if (MatchedSel.isUnarySelector())
1550  Diag(SelLoc, DiagID)
1551  << Sel<< isClassMessage << MatchedSel
1552  << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1553  else
1554  Diag(SelLoc, DiagID) << Sel<< isClassMessage << MatchedSel;
1555  }
1556  else
1557  Diag(SelLoc, DiagID)
1558  << Sel << isClassMessage << SourceRange(SelectorLocs.front(),
1559  SelectorLocs.back());
1560  // Find the class to which we are sending this message.
1561  if (ReceiverType->isObjCObjectPointerType()) {
1562  if (ObjCInterfaceDecl *ThisClass =
1563  ReceiverType->getAs<ObjCObjectPointerType>()->getInterfaceDecl()) {
1564  Diag(ThisClass->getLocation(), diag::note_receiver_class_declared);
1565  if (!RecRange.isInvalid())
1566  if (ThisClass->lookupClassMethod(Sel))
1567  Diag(RecRange.getBegin(),diag::note_receiver_expr_here)
1568  << FixItHint::CreateReplacement(RecRange,
1569  ThisClass->getNameAsString());
1570  }
1571  }
1572  }
1573 
1574  // In debuggers, we want to use __unknown_anytype for these
1575  // results so that clients can cast them.
1576  if (getLangOpts().DebuggerSupport) {
1577  ReturnType = Context.UnknownAnyTy;
1578  } else {
1579  ReturnType = Context.getObjCIdType();
1580  }
1581  VK = VK_RValue;
1582  return false;
1583  }
1584 
1585  ReturnType = getMessageSendResultType(ReceiverType, Method, isClassMessage,
1586  isSuperMessage);
1587  VK = Expr::getValueKindForType(Method->getReturnType());
1588 
1589  unsigned NumNamedArgs = Sel.getNumArgs();
1590  // Method might have more arguments than selector indicates. This is due
1591  // to addition of c-style arguments in method.
1592  if (Method->param_size() > Sel.getNumArgs())
1593  NumNamedArgs = Method->param_size();
1594  // FIXME. This need be cleaned up.
1595  if (Args.size() < NumNamedArgs) {
1596  Diag(SelLoc, diag::err_typecheck_call_too_few_args)
1597  << 2 << NumNamedArgs << static_cast<unsigned>(Args.size());
1598  return false;
1599  }
1600 
1601  // Compute the set of type arguments to be substituted into each parameter
1602  // type.
1603  Optional<ArrayRef<QualType>> typeArgs
1604  = ReceiverType->getObjCSubstitutions(Method->getDeclContext());
1605  bool IsError = false;
1606  for (unsigned i = 0; i < NumNamedArgs; i++) {
1607  // We can't do any type-checking on a type-dependent argument.
1608  if (Args[i]->isTypeDependent())
1609  continue;
1610 
1611  Expr *argExpr = Args[i];
1612 
1613  ParmVarDecl *param = Method->parameters()[i];
1614  assert(argExpr && "CheckMessageArgumentTypes(): missing expression");
1615 
1616  // Strip the unbridged-cast placeholder expression off unless it's
1617  // a consumed argument.
1618  if (argExpr->hasPlaceholderType(BuiltinType::ARCUnbridgedCast) &&
1619  !param->hasAttr<CFConsumedAttr>())
1620  argExpr = stripARCUnbridgedCast(argExpr);
1621 
1622  // If the parameter is __unknown_anytype, infer its type
1623  // from the argument.
1624  if (param->getType() == Context.UnknownAnyTy) {
1625  QualType paramType;
1626  ExprResult argE = checkUnknownAnyArg(SelLoc, argExpr, paramType);
1627  if (argE.isInvalid()) {
1628  IsError = true;
1629  } else {
1630  Args[i] = argE.get();
1631 
1632  // Update the parameter type in-place.
1633  param->setType(paramType);
1634  }
1635  continue;
1636  }
1637 
1638  QualType origParamType = param->getType();
1639  QualType paramType = param->getType();
1640  if (typeArgs)
1641  paramType = paramType.substObjCTypeArgs(
1642  Context,
1643  *typeArgs,
1645 
1646  if (RequireCompleteType(argExpr->getSourceRange().getBegin(),
1647  paramType,
1648  diag::err_call_incomplete_argument, argExpr))
1649  return true;
1650 
1651  InitializedEntity Entity
1652  = InitializedEntity::InitializeParameter(Context, param, paramType);
1653  ExprResult ArgE = PerformCopyInitialization(Entity, SourceLocation(), argExpr);
1654  if (ArgE.isInvalid())
1655  IsError = true;
1656  else {
1657  Args[i] = ArgE.getAs<Expr>();
1658 
1659  // If we are type-erasing a block to a block-compatible
1660  // Objective-C pointer type, we may need to extend the lifetime
1661  // of the block object.
1662  if (typeArgs && Args[i]->isRValue() && paramType->isBlockPointerType() &&
1663  Args[i]->getType()->isBlockPointerType() &&
1664  origParamType->isObjCObjectPointerType()) {
1665  ExprResult arg = Args[i];
1666  maybeExtendBlockObject(arg);
1667  Args[i] = arg.get();
1668  }
1669  }
1670  }
1671 
1672  // Promote additional arguments to variadic methods.
1673  if (Method->isVariadic()) {
1674  for (unsigned i = NumNamedArgs, e = Args.size(); i < e; ++i) {
1675  if (Args[i]->isTypeDependent())
1676  continue;
1677 
1678  ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], VariadicMethod,
1679  nullptr);
1680  IsError |= Arg.isInvalid();
1681  Args[i] = Arg.get();
1682  }
1683  } else {
1684  // Check for extra arguments to non-variadic methods.
1685  if (Args.size() != NumNamedArgs) {
1686  Diag(Args[NumNamedArgs]->getLocStart(),
1687  diag::err_typecheck_call_too_many_args)
1688  << 2 /*method*/ << NumNamedArgs << static_cast<unsigned>(Args.size())
1689  << Method->getSourceRange()
1690  << SourceRange(Args[NumNamedArgs]->getLocStart(),
1691  Args.back()->getLocEnd());
1692  }
1693  }
1694 
1695  DiagnoseSentinelCalls(Method, SelLoc, Args);
1696 
1697  // Do additional checkings on method.
1698  IsError |= CheckObjCMethodCall(
1699  Method, SelLoc, makeArrayRef(Args.data(), Args.size()));
1700 
1701  return IsError;
1702 }
1703 
1704 bool Sema::isSelfExpr(Expr *RExpr) {
1705  // 'self' is objc 'self' in an objc method only.
1706  ObjCMethodDecl *Method =
1707  dyn_cast_or_null<ObjCMethodDecl>(CurContext->getNonClosureAncestor());
1708  return isSelfExpr(RExpr, Method);
1709 }
1710 
1711 bool Sema::isSelfExpr(Expr *receiver, const ObjCMethodDecl *method) {
1712  if (!method) return false;
1713 
1714  receiver = receiver->IgnoreParenLValueCasts();
1715  if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(receiver))
1716  if (DRE->getDecl() == method->getSelfDecl())
1717  return true;
1718  return false;
1719 }
1720 
1721 /// LookupMethodInType - Look up a method in an ObjCObjectType.
1723  bool isInstance) {
1724  const ObjCObjectType *objType = type->castAs<ObjCObjectType>();
1725  if (ObjCInterfaceDecl *iface = objType->getInterface()) {
1726  // Look it up in the main interface (and categories, etc.)
1727  if (ObjCMethodDecl *method = iface->lookupMethod(sel, isInstance))
1728  return method;
1729 
1730  // Okay, look for "private" methods declared in any
1731  // @implementations we've seen.
1732  if (ObjCMethodDecl *method = iface->lookupPrivateMethod(sel, isInstance))
1733  return method;
1734  }
1735 
1736  // Check qualifiers.
1737  for (const auto *I : objType->quals())
1738  if (ObjCMethodDecl *method = I->lookupMethod(sel, isInstance))
1739  return method;
1740 
1741  return nullptr;
1742 }
1743 
1744 /// LookupMethodInQualifiedType - Lookups up a method in protocol qualifier
1745 /// list of a qualified objective pointer type.
1747  const ObjCObjectPointerType *OPT,
1748  bool Instance)
1749 {
1750  ObjCMethodDecl *MD = nullptr;
1751  for (const auto *PROTO : OPT->quals()) {
1752  if ((MD = PROTO->lookupMethod(Sel, Instance))) {
1753  return MD;
1754  }
1755  }
1756  return nullptr;
1757 }
1758 
1759 /// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an
1760 /// objective C interface. This is a property reference expression.
1763  Expr *BaseExpr, SourceLocation OpLoc,
1764  DeclarationName MemberName,
1765  SourceLocation MemberLoc,
1766  SourceLocation SuperLoc, QualType SuperType,
1767  bool Super) {
1768  const ObjCInterfaceType *IFaceT = OPT->getInterfaceType();
1769  ObjCInterfaceDecl *IFace = IFaceT->getDecl();
1770 
1771  if (!MemberName.isIdentifier()) {
1772  Diag(MemberLoc, diag::err_invalid_property_name)
1773  << MemberName << QualType(OPT, 0);
1774  return ExprError();
1775  }
1776 
1777  IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
1778 
1779  SourceRange BaseRange = Super? SourceRange(SuperLoc)
1780  : BaseExpr->getSourceRange();
1781  if (RequireCompleteType(MemberLoc, OPT->getPointeeType(),
1782  diag::err_property_not_found_forward_class,
1783  MemberName, BaseRange))
1784  return ExprError();
1785 
1786  if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(
1788  // Check whether we can reference this property.
1789  if (DiagnoseUseOfDecl(PD, MemberLoc))
1790  return ExprError();
1791  if (Super)
1792  return new (Context)
1794  OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1795  else
1796  return new (Context)
1798  OK_ObjCProperty, MemberLoc, BaseExpr);
1799  }
1800  // Check protocols on qualified interfaces.
1801  for (const auto *I : OPT->quals())
1802  if (ObjCPropertyDecl *PD = I->FindPropertyDeclaration(
1804  // Check whether we can reference this property.
1805  if (DiagnoseUseOfDecl(PD, MemberLoc))
1806  return ExprError();
1807 
1808  if (Super)
1809  return new (Context) ObjCPropertyRefExpr(
1810  PD, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty, MemberLoc,
1811  SuperLoc, SuperType);
1812  else
1813  return new (Context)
1815  OK_ObjCProperty, MemberLoc, BaseExpr);
1816  }
1817  // If that failed, look for an "implicit" property by seeing if the nullary
1818  // selector is implemented.
1819 
1820  // FIXME: The logic for looking up nullary and unary selectors should be
1821  // shared with the code in ActOnInstanceMessage.
1822 
1823  Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
1824  ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
1825 
1826  // May be found in property's qualified list.
1827  if (!Getter)
1828  Getter = LookupMethodInQualifiedType(Sel, OPT, true);
1829 
1830  // If this reference is in an @implementation, check for 'private' methods.
1831  if (!Getter)
1832  Getter = IFace->lookupPrivateMethod(Sel);
1833 
1834  if (Getter) {
1835  // Check if we can reference this property.
1836  if (DiagnoseUseOfDecl(Getter, MemberLoc))
1837  return ExprError();
1838  }
1839  // If we found a getter then this may be a valid dot-reference, we
1840  // will look for the matching setter, in case it is needed.
1841  Selector SetterSel =
1842  SelectorTable::constructSetterSelector(PP.getIdentifierTable(),
1843  PP.getSelectorTable(), Member);
1844  ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel);
1845 
1846  // May be found in property's qualified list.
1847  if (!Setter)
1848  Setter = LookupMethodInQualifiedType(SetterSel, OPT, true);
1849 
1850  if (!Setter) {
1851  // If this reference is in an @implementation, also check for 'private'
1852  // methods.
1853  Setter = IFace->lookupPrivateMethod(SetterSel);
1854  }
1855 
1856  if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc))
1857  return ExprError();
1858 
1859  // Special warning if member name used in a property-dot for a setter accessor
1860  // does not use a property with same name; e.g. obj.X = ... for a property with
1861  // name 'x'.
1862  if (Setter && Setter->isImplicit() && Setter->isPropertyAccessor() &&
1863  !IFace->FindPropertyDeclaration(
1865  if (const ObjCPropertyDecl *PDecl = Setter->findPropertyDecl()) {
1866  // Do not warn if user is using property-dot syntax to make call to
1867  // user named setter.
1868  if (!(PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter))
1869  Diag(MemberLoc,
1870  diag::warn_property_access_suggest)
1871  << MemberName << QualType(OPT, 0) << PDecl->getName()
1872  << FixItHint::CreateReplacement(MemberLoc, PDecl->getName());
1873  }
1874  }
1875 
1876  if (Getter || Setter) {
1877  if (Super)
1878  return new (Context)
1879  ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1880  OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1881  else
1882  return new (Context)
1883  ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1884  OK_ObjCProperty, MemberLoc, BaseExpr);
1885 
1886  }
1887 
1888  // Attempt to correct for typos in property names.
1889  if (TypoCorrection Corrected =
1890  CorrectTypo(DeclarationNameInfo(MemberName, MemberLoc),
1891  LookupOrdinaryName, nullptr, nullptr,
1892  llvm::make_unique<DeclFilterCCC<ObjCPropertyDecl>>(),
1893  CTK_ErrorRecovery, IFace, false, OPT)) {
1894  DeclarationName TypoResult = Corrected.getCorrection();
1895  if (TypoResult.isIdentifier() &&
1896  TypoResult.getAsIdentifierInfo() == Member) {
1897  // There is no need to try the correction if it is the same.
1898  NamedDecl *ChosenDecl =
1899  Corrected.isKeyword() ? nullptr : Corrected.getFoundDecl();
1900  if (ChosenDecl && isa<ObjCPropertyDecl>(ChosenDecl))
1901  if (cast<ObjCPropertyDecl>(ChosenDecl)->isClassProperty()) {
1902  // This is a class property, we should not use the instance to
1903  // access it.
1904  Diag(MemberLoc, diag::err_class_property_found) << MemberName
1905  << OPT->getInterfaceDecl()->getName()
1907  OPT->getInterfaceDecl()->getName());
1908  return ExprError();
1909  }
1910  } else {
1911  diagnoseTypo(Corrected, PDiag(diag::err_property_not_found_suggest)
1912  << MemberName << QualType(OPT, 0));
1913  return HandleExprPropertyRefExpr(OPT, BaseExpr, OpLoc,
1914  TypoResult, MemberLoc,
1915  SuperLoc, SuperType, Super);
1916  }
1917  }
1918  ObjCInterfaceDecl *ClassDeclared;
1919  if (ObjCIvarDecl *Ivar =
1920  IFace->lookupInstanceVariable(Member, ClassDeclared)) {
1921  QualType T = Ivar->getType();
1922  if (const ObjCObjectPointerType * OBJPT =
1924  if (RequireCompleteType(MemberLoc, OBJPT->getPointeeType(),
1925  diag::err_property_not_as_forward_class,
1926  MemberName, BaseExpr))
1927  return ExprError();
1928  }
1929  Diag(MemberLoc,
1930  diag::err_ivar_access_using_property_syntax_suggest)
1931  << MemberName << QualType(OPT, 0) << Ivar->getDeclName()
1932  << FixItHint::CreateReplacement(OpLoc, "->");
1933  return ExprError();
1934  }
1935 
1936  Diag(MemberLoc, diag::err_property_not_found)
1937  << MemberName << QualType(OPT, 0);
1938  if (Setter)
1939  Diag(Setter->getLocation(), diag::note_getter_unavailable)
1940  << MemberName << BaseExpr->getSourceRange();
1941  return ExprError();
1942 }
1943 
1946  IdentifierInfo &propertyName,
1947  SourceLocation receiverNameLoc,
1948  SourceLocation propertyNameLoc) {
1949 
1950  IdentifierInfo *receiverNamePtr = &receiverName;
1951  ObjCInterfaceDecl *IFace = getObjCInterfaceDecl(receiverNamePtr,
1952  receiverNameLoc);
1953 
1954  QualType SuperType;
1955  if (!IFace) {
1956  // If the "receiver" is 'super' in a method, handle it as an expression-like
1957  // property reference.
1958  if (receiverNamePtr->isStr("super")) {
1959  if (ObjCMethodDecl *CurMethod = tryCaptureObjCSelf(receiverNameLoc)) {
1960  if (auto classDecl = CurMethod->getClassInterface()) {
1961  SuperType = QualType(classDecl->getSuperClassType(), 0);
1962  if (CurMethod->isInstanceMethod()) {
1963  if (SuperType.isNull()) {
1964  // The current class does not have a superclass.
1965  Diag(receiverNameLoc, diag::err_root_class_cannot_use_super)
1966  << CurMethod->getClassInterface()->getIdentifier();
1967  return ExprError();
1968  }
1969  QualType T = Context.getObjCObjectPointerType(SuperType);
1970 
1971  return HandleExprPropertyRefExpr(T->castAs<ObjCObjectPointerType>(),
1972  /*BaseExpr*/nullptr,
1973  SourceLocation()/*OpLoc*/,
1974  &propertyName,
1975  propertyNameLoc,
1976  receiverNameLoc, T, true);
1977  }
1978 
1979  // Otherwise, if this is a class method, try dispatching to our
1980  // superclass.
1981  IFace = CurMethod->getClassInterface()->getSuperClass();
1982  }
1983  }
1984  }
1985 
1986  if (!IFace) {
1987  Diag(receiverNameLoc, diag::err_expected_either) << tok::identifier
1988  << tok::l_paren;
1989  return ExprError();
1990  }
1991  }
1992 
1993  Selector GetterSel;
1994  Selector SetterSel;
1995  if (auto PD = IFace->FindPropertyDeclaration(
1997  GetterSel = PD->getGetterName();
1998  SetterSel = PD->getSetterName();
1999  } else {
2000  GetterSel = PP.getSelectorTable().getNullarySelector(&propertyName);
2002  PP.getIdentifierTable(), PP.getSelectorTable(), &propertyName);
2003  }
2004 
2005  // Search for a declared property first.
2006  ObjCMethodDecl *Getter = IFace->lookupClassMethod(GetterSel);
2007 
2008  // If this reference is in an @implementation, check for 'private' methods.
2009  if (!Getter)
2010  Getter = IFace->lookupPrivateClassMethod(GetterSel);
2011 
2012  if (Getter) {
2013  // FIXME: refactor/share with ActOnMemberReference().
2014  // Check if we can reference this property.
2015  if (DiagnoseUseOfDecl(Getter, propertyNameLoc))
2016  return ExprError();
2017  }
2018 
2019  // Look for the matching setter, in case it is needed.
2020  ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel);
2021  if (!Setter) {
2022  // If this reference is in an @implementation, also check for 'private'
2023  // methods.
2024  Setter = IFace->lookupPrivateClassMethod(SetterSel);
2025  }
2026  // Look through local category implementations associated with the class.
2027  if (!Setter)
2028  Setter = IFace->getCategoryClassMethod(SetterSel);
2029 
2030  if (Setter && DiagnoseUseOfDecl(Setter, propertyNameLoc))
2031  return ExprError();
2032 
2033  if (Getter || Setter) {
2034  if (!SuperType.isNull())
2035  return new (Context)
2036  ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
2037  OK_ObjCProperty, propertyNameLoc, receiverNameLoc,
2038  SuperType);
2039 
2040  return new (Context) ObjCPropertyRefExpr(
2041  Getter, Setter, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty,
2042  propertyNameLoc, receiverNameLoc, IFace);
2043  }
2044  return ExprError(Diag(propertyNameLoc, diag::err_property_not_found)
2045  << &propertyName << Context.getObjCInterfaceType(IFace));
2046 }
2047 
2048 namespace {
2049 
2050 class ObjCInterfaceOrSuperCCC : public CorrectionCandidateCallback {
2051  public:
2052  ObjCInterfaceOrSuperCCC(ObjCMethodDecl *Method) {
2053  // Determine whether "super" is acceptable in the current context.
2054  if (Method && Method->getClassInterface())
2055  WantObjCSuper = Method->getClassInterface()->getSuperClass();
2056  }
2057 
2058  bool ValidateCandidate(const TypoCorrection &candidate) override {
2059  return candidate.getCorrectionDeclAs<ObjCInterfaceDecl>() ||
2060  candidate.isKeyword("super");
2061  }
2062 };
2063 
2064 } // end anonymous namespace
2065 
2067  IdentifierInfo *Name,
2068  SourceLocation NameLoc,
2069  bool IsSuper,
2070  bool HasTrailingDot,
2071  ParsedType &ReceiverType) {
2072  ReceiverType = nullptr;
2073 
2074  // If the identifier is "super" and there is no trailing dot, we're
2075  // messaging super. If the identifier is "super" and there is a
2076  // trailing dot, it's an instance message.
2077  if (IsSuper && S->isInObjcMethodScope())
2078  return HasTrailingDot? ObjCInstanceMessage : ObjCSuperMessage;
2079 
2080  LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName);
2081  LookupName(Result, S);
2082 
2083  switch (Result.getResultKind()) {
2085  // Normal name lookup didn't find anything. If we're in an
2086  // Objective-C method, look for ivars. If we find one, we're done!
2087  // FIXME: This is a hack. Ivar lookup should be part of normal
2088  // lookup.
2089  if (ObjCMethodDecl *Method = getCurMethodDecl()) {
2090  if (!Method->getClassInterface()) {
2091  // Fall back: let the parser try to parse it as an instance message.
2092  return ObjCInstanceMessage;
2093  }
2094 
2095  ObjCInterfaceDecl *ClassDeclared;
2096  if (Method->getClassInterface()->lookupInstanceVariable(Name,
2097  ClassDeclared))
2098  return ObjCInstanceMessage;
2099  }
2100 
2101  // Break out; we'll perform typo correction below.
2102  break;
2103 
2108  Result.suppressDiagnostics();
2109  return ObjCInstanceMessage;
2110 
2111  case LookupResult::Found: {
2112  // If the identifier is a class or not, and there is a trailing dot,
2113  // it's an instance message.
2114  if (HasTrailingDot)
2115  return ObjCInstanceMessage;
2116  // We found something. If it's a type, then we have a class
2117  // message. Otherwise, it's an instance message.
2118  NamedDecl *ND = Result.getFoundDecl();
2119  QualType T;
2120  if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND))
2121  T = Context.getObjCInterfaceType(Class);
2122  else if (TypeDecl *Type = dyn_cast<TypeDecl>(ND)) {
2123  T = Context.getTypeDeclType(Type);
2124  DiagnoseUseOfDecl(Type, NameLoc);
2125  }
2126  else
2127  return ObjCInstanceMessage;
2128 
2129  // We have a class message, and T is the type we're
2130  // messaging. Build source-location information for it.
2131  TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2132  ReceiverType = CreateParsedType(T, TSInfo);
2133  return ObjCClassMessage;
2134  }
2135  }
2136 
2137  if (TypoCorrection Corrected = CorrectTypo(
2138  Result.getLookupNameInfo(), Result.getLookupKind(), S, nullptr,
2139  llvm::make_unique<ObjCInterfaceOrSuperCCC>(getCurMethodDecl()),
2140  CTK_ErrorRecovery, nullptr, false, nullptr, false)) {
2141  if (Corrected.isKeyword()) {
2142  // If we've found the keyword "super" (the only keyword that would be
2143  // returned by CorrectTypo), this is a send to super.
2144  diagnoseTypo(Corrected,
2145  PDiag(diag::err_unknown_receiver_suggest) << Name);
2146  return ObjCSuperMessage;
2147  } else if (ObjCInterfaceDecl *Class =
2148  Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>()) {
2149  // If we found a declaration, correct when it refers to an Objective-C
2150  // class.
2151  diagnoseTypo(Corrected,
2152  PDiag(diag::err_unknown_receiver_suggest) << Name);
2153  QualType T = Context.getObjCInterfaceType(Class);
2154  TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2155  ReceiverType = CreateParsedType(T, TSInfo);
2156  return ObjCClassMessage;
2157  }
2158  }
2159 
2160  // Fall back: let the parser try to parse it as an instance message.
2161  return ObjCInstanceMessage;
2162 }
2163 
2165  SourceLocation SuperLoc,
2166  Selector Sel,
2167  SourceLocation LBracLoc,
2168  ArrayRef<SourceLocation> SelectorLocs,
2169  SourceLocation RBracLoc,
2170  MultiExprArg Args) {
2171  // Determine whether we are inside a method or not.
2172  ObjCMethodDecl *Method = tryCaptureObjCSelf(SuperLoc);
2173  if (!Method) {
2174  Diag(SuperLoc, diag::err_invalid_receiver_to_message_super);
2175  return ExprError();
2176  }
2177 
2178  ObjCInterfaceDecl *Class = Method->getClassInterface();
2179  if (!Class) {
2180  Diag(SuperLoc, diag::err_no_super_class_message)
2181  << Method->getDeclName();
2182  return ExprError();
2183  }
2184 
2185  QualType SuperTy(Class->getSuperClassType(), 0);
2186  if (SuperTy.isNull()) {
2187  // The current class does not have a superclass.
2188  Diag(SuperLoc, diag::err_root_class_cannot_use_super)
2189  << Class->getIdentifier();
2190  return ExprError();
2191  }
2192 
2193  // We are in a method whose class has a superclass, so 'super'
2194  // is acting as a keyword.
2195  if (Method->getSelector() == Sel)
2196  getCurFunction()->ObjCShouldCallSuper = false;
2197 
2198  if (Method->isInstanceMethod()) {
2199  // Since we are in an instance method, this is an instance
2200  // message to the superclass instance.
2201  SuperTy = Context.getObjCObjectPointerType(SuperTy);
2202  return BuildInstanceMessage(nullptr, SuperTy, SuperLoc,
2203  Sel, /*Method=*/nullptr,
2204  LBracLoc, SelectorLocs, RBracLoc, Args);
2205  }
2206 
2207  // Since we are in a class method, this is a class message to
2208  // the superclass.
2209  return BuildClassMessage(/*ReceiverTypeInfo=*/nullptr,
2210  SuperTy,
2211  SuperLoc, Sel, /*Method=*/nullptr,
2212  LBracLoc, SelectorLocs, RBracLoc, Args);
2213 }
2214 
2216  bool isSuperReceiver,
2217  SourceLocation Loc,
2218  Selector Sel,
2219  ObjCMethodDecl *Method,
2220  MultiExprArg Args) {
2221  TypeSourceInfo *receiverTypeInfo = nullptr;
2222  if (!ReceiverType.isNull())
2223  receiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType);
2224 
2225  return BuildClassMessage(receiverTypeInfo, ReceiverType,
2226  /*SuperLoc=*/isSuperReceiver ? Loc : SourceLocation(),
2227  Sel, Method, Loc, Loc, Loc, Args,
2228  /*isImplicit=*/true);
2229 }
2230 
2231 static void applyCocoaAPICheck(Sema &S, const ObjCMessageExpr *Msg,
2232  unsigned DiagID,
2233  bool (*refactor)(const ObjCMessageExpr *,
2234  const NSAPI &, edit::Commit &)) {
2235  SourceLocation MsgLoc = Msg->getExprLoc();
2236  if (S.Diags.isIgnored(DiagID, MsgLoc))
2237  return;
2238 
2239  SourceManager &SM = S.SourceMgr;
2240  edit::Commit ECommit(SM, S.LangOpts);
2241  if (refactor(Msg,*S.NSAPIObj, ECommit)) {
2242  DiagnosticBuilder Builder = S.Diag(MsgLoc, DiagID)
2243  << Msg->getSelector() << Msg->getSourceRange();
2244  // FIXME: Don't emit diagnostic at all if fixits are non-commitable.
2245  if (!ECommit.isCommitable())
2246  return;
2248  I = ECommit.edit_begin(), E = ECommit.edit_end(); I != E; ++I) {
2249  const edit::Commit::Edit &Edit = *I;
2250  switch (Edit.Kind) {
2253  Edit.Text,
2254  Edit.BeforePrev));
2255  break;
2257  Builder.AddFixItHint(
2259  Edit.getInsertFromRange(SM),
2260  Edit.BeforePrev));
2261  break;
2264  break;
2265  }
2266  }
2267  }
2268 }
2269 
2270 static void checkCocoaAPI(Sema &S, const ObjCMessageExpr *Msg) {
2271  applyCocoaAPICheck(S, Msg, diag::warn_objc_redundant_literal_use,
2273 }
2274 
2276  const ObjCMethodDecl *Method,
2277  ArrayRef<Expr *> Args, QualType ReceiverType,
2278  bool IsClassObjectCall) {
2279  // Check if this is a performSelector method that uses a selector that returns
2280  // a record or a vector type.
2281  if (Method->getSelector().getMethodFamily() != OMF_performSelector ||
2282  Args.empty())
2283  return;
2284  const auto *SE = dyn_cast<ObjCSelectorExpr>(Args[0]->IgnoreParens());
2285  if (!SE)
2286  return;
2287  ObjCMethodDecl *ImpliedMethod;
2288  if (!IsClassObjectCall) {
2289  const auto *OPT = ReceiverType->getAs<ObjCObjectPointerType>();
2290  if (!OPT || !OPT->getInterfaceDecl())
2291  return;
2292  ImpliedMethod =
2293  OPT->getInterfaceDecl()->lookupInstanceMethod(SE->getSelector());
2294  if (!ImpliedMethod)
2295  ImpliedMethod =
2296  OPT->getInterfaceDecl()->lookupPrivateMethod(SE->getSelector());
2297  } else {
2298  const auto *IT = ReceiverType->getAs<ObjCInterfaceType>();
2299  if (!IT)
2300  return;
2301  ImpliedMethod = IT->getDecl()->lookupClassMethod(SE->getSelector());
2302  if (!ImpliedMethod)
2303  ImpliedMethod =
2304  IT->getDecl()->lookupPrivateClassMethod(SE->getSelector());
2305  }
2306  if (!ImpliedMethod)
2307  return;
2308  QualType Ret = ImpliedMethod->getReturnType();
2309  if (Ret->isRecordType() || Ret->isVectorType() || Ret->isExtVectorType()) {
2310  QualType Ret = ImpliedMethod->getReturnType();
2311  S.Diag(Loc, diag::warn_objc_unsafe_perform_selector)
2312  << Method->getSelector()
2313  << (!Ret->isRecordType()
2314  ? /*Vector*/ 2
2315  : Ret->isUnionType() ? /*Union*/ 1 : /*Struct*/ 0);
2316  S.Diag(ImpliedMethod->getLocStart(),
2317  diag::note_objc_unsafe_perform_selector_method_declared_here)
2318  << ImpliedMethod->getSelector() << Ret;
2319  }
2320 }
2321 
2322 /// \brief Diagnose use of %s directive in an NSString which is being passed
2323 /// as formatting string to formatting method.
2324 static void
2326  ObjCMethodDecl *Method,
2327  Selector Sel,
2328  Expr **Args, unsigned NumArgs) {
2329  unsigned Idx = 0;
2330  bool Format = false;
2332  if (SFFamily == ObjCStringFormatFamily::SFF_NSString) {
2333  Idx = 0;
2334  Format = true;
2335  }
2336  else if (Method) {
2337  for (const auto *I : Method->specific_attrs<FormatAttr>()) {
2338  if (S.GetFormatNSStringIdx(I, Idx)) {
2339  Format = true;
2340  break;
2341  }
2342  }
2343  }
2344  if (!Format || NumArgs <= Idx)
2345  return;
2346 
2347  Expr *FormatExpr = Args[Idx];
2348  if (ObjCStringLiteral *OSL =
2349  dyn_cast<ObjCStringLiteral>(FormatExpr->IgnoreParenImpCasts())) {
2350  StringLiteral *FormatString = OSL->getString();
2351  if (S.FormatStringHasSArg(FormatString)) {
2352  S.Diag(FormatExpr->getExprLoc(), diag::warn_objc_cdirective_format_string)
2353  << "%s" << 0 << 0;
2354  if (Method)
2355  S.Diag(Method->getLocation(), diag::note_method_declared_at)
2356  << Method->getDeclName();
2357  }
2358  }
2359 }
2360 
2361 /// \brief Build an Objective-C class message expression.
2362 ///
2363 /// This routine takes care of both normal class messages and
2364 /// class messages to the superclass.
2365 ///
2366 /// \param ReceiverTypeInfo Type source information that describes the
2367 /// receiver of this message. This may be NULL, in which case we are
2368 /// sending to the superclass and \p SuperLoc must be a valid source
2369 /// location.
2370 
2371 /// \param ReceiverType The type of the object receiving the
2372 /// message. When \p ReceiverTypeInfo is non-NULL, this is the same
2373 /// type as that refers to. For a superclass send, this is the type of
2374 /// the superclass.
2375 ///
2376 /// \param SuperLoc The location of the "super" keyword in a
2377 /// superclass message.
2378 ///
2379 /// \param Sel The selector to which the message is being sent.
2380 ///
2381 /// \param Method The method that this class message is invoking, if
2382 /// already known.
2383 ///
2384 /// \param LBracLoc The location of the opening square bracket ']'.
2385 ///
2386 /// \param RBracLoc The location of the closing square bracket ']'.
2387 ///
2388 /// \param ArgsIn The message arguments.
2390  QualType ReceiverType,
2391  SourceLocation SuperLoc,
2392  Selector Sel,
2393  ObjCMethodDecl *Method,
2394  SourceLocation LBracLoc,
2395  ArrayRef<SourceLocation> SelectorLocs,
2396  SourceLocation RBracLoc,
2397  MultiExprArg ArgsIn,
2398  bool isImplicit) {
2399  SourceLocation Loc = SuperLoc.isValid()? SuperLoc
2400  : ReceiverTypeInfo->getTypeLoc().getSourceRange().getBegin();
2401  if (LBracLoc.isInvalid()) {
2402  Diag(Loc, diag::err_missing_open_square_message_send)
2403  << FixItHint::CreateInsertion(Loc, "[");
2404  LBracLoc = Loc;
2405  }
2406  SourceLocation SelLoc;
2407  if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2408  SelLoc = SelectorLocs.front();
2409  else
2410  SelLoc = Loc;
2411 
2412  if (ReceiverType->isDependentType()) {
2413  // If the receiver type is dependent, we can't type-check anything
2414  // at this point. Build a dependent expression.
2415  unsigned NumArgs = ArgsIn.size();
2416  Expr **Args = ArgsIn.data();
2417  assert(SuperLoc.isInvalid() && "Message to super with dependent type");
2418  return ObjCMessageExpr::Create(
2419  Context, ReceiverType, VK_RValue, LBracLoc, ReceiverTypeInfo, Sel,
2420  SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs), RBracLoc,
2421  isImplicit);
2422  }
2423 
2424  // Find the class to which we are sending this message.
2425  ObjCInterfaceDecl *Class = nullptr;
2426  const ObjCObjectType *ClassType = ReceiverType->getAs<ObjCObjectType>();
2427  if (!ClassType || !(Class = ClassType->getInterface())) {
2428  Diag(Loc, diag::err_invalid_receiver_class_message)
2429  << ReceiverType;
2430  return ExprError();
2431  }
2432  assert(Class && "We don't know which class we're messaging?");
2433  // objc++ diagnoses during typename annotation.
2434  if (!getLangOpts().CPlusPlus)
2435  (void)DiagnoseUseOfDecl(Class, SelLoc);
2436  // Find the method we are messaging.
2437  if (!Method) {
2438  SourceRange TypeRange
2439  = SuperLoc.isValid()? SourceRange(SuperLoc)
2440  : ReceiverTypeInfo->getTypeLoc().getSourceRange();
2441  if (RequireCompleteType(Loc, Context.getObjCInterfaceType(Class),
2442  (getLangOpts().ObjCAutoRefCount
2443  ? diag::err_arc_receiver_forward_class
2444  : diag::warn_receiver_forward_class),
2445  TypeRange)) {
2446  // A forward class used in messaging is treated as a 'Class'
2447  Method = LookupFactoryMethodInGlobalPool(Sel,
2448  SourceRange(LBracLoc, RBracLoc));
2449  if (Method && !getLangOpts().ObjCAutoRefCount)
2450  Diag(Method->getLocation(), diag::note_method_sent_forward_class)
2451  << Method->getDeclName();
2452  }
2453  if (!Method)
2454  Method = Class->lookupClassMethod(Sel);
2455 
2456  // If we have an implementation in scope, check "private" methods.
2457  if (!Method)
2458  Method = Class->lookupPrivateClassMethod(Sel);
2459 
2460  if (Method && DiagnoseUseOfDecl(Method, SelLoc))
2461  return ExprError();
2462  }
2463 
2464  // Check the argument types and determine the result type.
2465  QualType ReturnType;
2466  ExprValueKind VK = VK_RValue;
2467 
2468  unsigned NumArgs = ArgsIn.size();
2469  Expr **Args = ArgsIn.data();
2470  if (CheckMessageArgumentTypes(ReceiverType, MultiExprArg(Args, NumArgs),
2471  Sel, SelectorLocs,
2472  Method, true,
2473  SuperLoc.isValid(), LBracLoc, RBracLoc,
2474  SourceRange(),
2475  ReturnType, VK))
2476  return ExprError();
2477 
2478  if (Method && !Method->getReturnType()->isVoidType() &&
2479  RequireCompleteType(LBracLoc, Method->getReturnType(),
2480  diag::err_illegal_message_expr_incomplete_type))
2481  return ExprError();
2482 
2483  // Warn about explicit call of +initialize on its own class. But not on 'super'.
2484  if (Method && Method->getMethodFamily() == OMF_initialize) {
2485  if (!SuperLoc.isValid()) {
2486  const ObjCInterfaceDecl *ID =
2487  dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext());
2488  if (ID == Class) {
2489  Diag(Loc, diag::warn_direct_initialize_call);
2490  Diag(Method->getLocation(), diag::note_method_declared_at)
2491  << Method->getDeclName();
2492  }
2493  }
2494  else if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2495  // [super initialize] is allowed only within an +initialize implementation
2496  if (CurMeth->getMethodFamily() != OMF_initialize) {
2497  Diag(Loc, diag::warn_direct_super_initialize_call);
2498  Diag(Method->getLocation(), diag::note_method_declared_at)
2499  << Method->getDeclName();
2500  Diag(CurMeth->getLocation(), diag::note_method_declared_at)
2501  << CurMeth->getDeclName();
2502  }
2503  }
2504  }
2505 
2506  DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
2507 
2508  // Construct the appropriate ObjCMessageExpr.
2509  ObjCMessageExpr *Result;
2510  if (SuperLoc.isValid())
2511  Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2512  SuperLoc, /*IsInstanceSuper=*/false,
2513  ReceiverType, Sel, SelectorLocs,
2514  Method, makeArrayRef(Args, NumArgs),
2515  RBracLoc, isImplicit);
2516  else {
2517  Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2518  ReceiverTypeInfo, Sel, SelectorLocs,
2519  Method, makeArrayRef(Args, NumArgs),
2520  RBracLoc, isImplicit);
2521  if (!isImplicit)
2522  checkCocoaAPI(*this, Result);
2523  }
2524  if (Method)
2525  checkFoundationAPI(*this, SelLoc, Method, makeArrayRef(Args, NumArgs),
2526  ReceiverType, /*IsClassObjectCall=*/true);
2527  return MaybeBindToTemporary(Result);
2528 }
2529 
2530 // ActOnClassMessage - used for both unary and keyword messages.
2531 // ArgExprs is optional - if it is present, the number of expressions
2532 // is obtained from Sel.getNumArgs().
2534  ParsedType Receiver,
2535  Selector Sel,
2536  SourceLocation LBracLoc,
2537  ArrayRef<SourceLocation> SelectorLocs,
2538  SourceLocation RBracLoc,
2539  MultiExprArg Args) {
2540  TypeSourceInfo *ReceiverTypeInfo;
2541  QualType ReceiverType = GetTypeFromParser(Receiver, &ReceiverTypeInfo);
2542  if (ReceiverType.isNull())
2543  return ExprError();
2544 
2545  if (!ReceiverTypeInfo)
2546  ReceiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType, LBracLoc);
2547 
2548  return BuildClassMessage(ReceiverTypeInfo, ReceiverType,
2549  /*SuperLoc=*/SourceLocation(), Sel,
2550  /*Method=*/nullptr, LBracLoc, SelectorLocs, RBracLoc,
2551  Args);
2552 }
2553 
2555  QualType ReceiverType,
2556  SourceLocation Loc,
2557  Selector Sel,
2558  ObjCMethodDecl *Method,
2559  MultiExprArg Args) {
2560  return BuildInstanceMessage(Receiver, ReceiverType,
2561  /*SuperLoc=*/!Receiver ? Loc : SourceLocation(),
2562  Sel, Method, Loc, Loc, Loc, Args,
2563  /*isImplicit=*/true);
2564 }
2565 
2567  if (!S.NSAPIObj)
2568  return false;
2569  const auto *Protocol = dyn_cast<ObjCProtocolDecl>(M->getDeclContext());
2570  if (!Protocol)
2571  return false;
2572  const IdentifierInfo *II = S.NSAPIObj->getNSClassId(NSAPI::ClassId_NSObject);
2573  if (const auto *RootClass = dyn_cast_or_null<ObjCInterfaceDecl>(
2574  S.LookupSingleName(S.TUScope, II, Protocol->getLocStart(),
2576  for (const ObjCProtocolDecl *P : RootClass->all_referenced_protocols()) {
2577  if (P->getCanonicalDecl() == Protocol->getCanonicalDecl())
2578  return true;
2579  }
2580  }
2581  return false;
2582 }
2583 
2584 /// \brief Build an Objective-C instance message expression.
2585 ///
2586 /// This routine takes care of both normal instance messages and
2587 /// instance messages to the superclass instance.
2588 ///
2589 /// \param Receiver The expression that computes the object that will
2590 /// receive this message. This may be empty, in which case we are
2591 /// sending to the superclass instance and \p SuperLoc must be a valid
2592 /// source location.
2593 ///
2594 /// \param ReceiverType The (static) type of the object receiving the
2595 /// message. When a \p Receiver expression is provided, this is the
2596 /// same type as that expression. For a superclass instance send, this
2597 /// is a pointer to the type of the superclass.
2598 ///
2599 /// \param SuperLoc The location of the "super" keyword in a
2600 /// superclass instance message.
2601 ///
2602 /// \param Sel The selector to which the message is being sent.
2603 ///
2604 /// \param Method The method that this instance message is invoking, if
2605 /// already known.
2606 ///
2607 /// \param LBracLoc The location of the opening square bracket ']'.
2608 ///
2609 /// \param RBracLoc The location of the closing square bracket ']'.
2610 ///
2611 /// \param ArgsIn The message arguments.
2613  QualType ReceiverType,
2614  SourceLocation SuperLoc,
2615  Selector Sel,
2616  ObjCMethodDecl *Method,
2617  SourceLocation LBracLoc,
2618  ArrayRef<SourceLocation> SelectorLocs,
2619  SourceLocation RBracLoc,
2620  MultiExprArg ArgsIn,
2621  bool isImplicit) {
2622  assert((Receiver || SuperLoc.isValid()) && "If the Receiver is null, the "
2623  "SuperLoc must be valid so we can "
2624  "use it instead.");
2625 
2626  // The location of the receiver.
2627  SourceLocation Loc = SuperLoc.isValid()? SuperLoc : Receiver->getLocStart();
2628  SourceRange RecRange =
2629  SuperLoc.isValid()? SuperLoc : Receiver->getSourceRange();
2630  SourceLocation SelLoc;
2631  if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2632  SelLoc = SelectorLocs.front();
2633  else
2634  SelLoc = Loc;
2635 
2636  if (LBracLoc.isInvalid()) {
2637  Diag(Loc, diag::err_missing_open_square_message_send)
2638  << FixItHint::CreateInsertion(Loc, "[");
2639  LBracLoc = Loc;
2640  }
2641 
2642  // If we have a receiver expression, perform appropriate promotions
2643  // and determine receiver type.
2644  if (Receiver) {
2645  if (Receiver->hasPlaceholderType()) {
2646  ExprResult Result;
2647  if (Receiver->getType() == Context.UnknownAnyTy)
2648  Result = forceUnknownAnyToType(Receiver, Context.getObjCIdType());
2649  else
2650  Result = CheckPlaceholderExpr(Receiver);
2651  if (Result.isInvalid()) return ExprError();
2652  Receiver = Result.get();
2653  }
2654 
2655  if (Receiver->isTypeDependent()) {
2656  // If the receiver is type-dependent, we can't type-check anything
2657  // at this point. Build a dependent expression.
2658  unsigned NumArgs = ArgsIn.size();
2659  Expr **Args = ArgsIn.data();
2660  assert(SuperLoc.isInvalid() && "Message to super with dependent type");
2661  return ObjCMessageExpr::Create(
2662  Context, Context.DependentTy, VK_RValue, LBracLoc, Receiver, Sel,
2663  SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs),
2664  RBracLoc, isImplicit);
2665  }
2666 
2667  // If necessary, apply function/array conversion to the receiver.
2668  // C99 6.7.5.3p[7,8].
2669  ExprResult Result = DefaultFunctionArrayLvalueConversion(Receiver);
2670  if (Result.isInvalid())
2671  return ExprError();
2672  Receiver = Result.get();
2673  ReceiverType = Receiver->getType();
2674 
2675  // If the receiver is an ObjC pointer, a block pointer, or an
2676  // __attribute__((NSObject)) pointer, we don't need to do any
2677  // special conversion in order to look up a receiver.
2678  if (ReceiverType->isObjCRetainableType()) {
2679  // do nothing
2680  } else if (!getLangOpts().ObjCAutoRefCount &&
2681  !Context.getObjCIdType().isNull() &&
2682  (ReceiverType->isPointerType() ||
2683  ReceiverType->isIntegerType())) {
2684  // Implicitly convert integers and pointers to 'id' but emit a warning.
2685  // But not in ARC.
2686  Diag(Loc, diag::warn_bad_receiver_type)
2687  << ReceiverType
2688  << Receiver->getSourceRange();
2689  if (ReceiverType->isPointerType()) {
2690  Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2691  CK_CPointerToObjCPointerCast).get();
2692  } else {
2693  // TODO: specialized warning on null receivers?
2694  bool IsNull = Receiver->isNullPointerConstant(Context,
2696  CastKind Kind = IsNull ? CK_NullToPointer : CK_IntegralToPointer;
2697  Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2698  Kind).get();
2699  }
2700  ReceiverType = Receiver->getType();
2701  } else if (getLangOpts().CPlusPlus) {
2702  // The receiver must be a complete type.
2703  if (RequireCompleteType(Loc, Receiver->getType(),
2704  diag::err_incomplete_receiver_type))
2705  return ExprError();
2706 
2707  ExprResult result = PerformContextuallyConvertToObjCPointer(Receiver);
2708  if (result.isUsable()) {
2709  Receiver = result.get();
2710  ReceiverType = Receiver->getType();
2711  }
2712  }
2713  }
2714 
2715  if (ReceiverType->isObjCIdType() && !isImplicit)
2716  Diag(Receiver->getExprLoc(), diag::warn_messaging_unqualified_id);
2717 
2718  // There's a somewhat weird interaction here where we assume that we
2719  // won't actually have a method unless we also don't need to do some
2720  // of the more detailed type-checking on the receiver.
2721 
2722  if (!Method) {
2723  // Handle messages to id and __kindof types (where we use the
2724  // global method pool).
2725  const ObjCObjectType *typeBound = nullptr;
2726  bool receiverIsIdLike = ReceiverType->isObjCIdOrObjectKindOfType(Context,
2727  typeBound);
2728  if (receiverIsIdLike || ReceiverType->isBlockPointerType() ||
2729  (Receiver && Context.isObjCNSObjectType(Receiver->getType()))) {
2731  // If we have a type bound, further filter the methods.
2732  CollectMultipleMethodsInGlobalPool(Sel, Methods, true/*InstanceFirst*/,
2733  true/*CheckTheOther*/, typeBound);
2734  if (!Methods.empty()) {
2735  // We choose the first method as the initial candidate, then try to
2736  // select a better one.
2737  Method = Methods[0];
2738 
2739  if (ObjCMethodDecl *BestMethod =
2740  SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(), Methods))
2741  Method = BestMethod;
2742 
2743  if (!AreMultipleMethodsInGlobalPool(Sel, Method,
2744  SourceRange(LBracLoc, RBracLoc),
2745  receiverIsIdLike, Methods))
2746  DiagnoseUseOfDecl(Method, SelLoc);
2747  }
2748  } else if (ReceiverType->isObjCClassOrClassKindOfType() ||
2749  ReceiverType->isObjCQualifiedClassType()) {
2750  // Handle messages to Class.
2751  // We allow sending a message to a qualified Class ("Class<foo>"), which
2752  // is ok as long as one of the protocols implements the selector (if not,
2753  // warn).
2754  if (!ReceiverType->isObjCClassOrClassKindOfType()) {
2755  const ObjCObjectPointerType *QClassTy
2756  = ReceiverType->getAsObjCQualifiedClassType();
2757  // Search protocols for class methods.
2758  Method = LookupMethodInQualifiedType(Sel, QClassTy, false);
2759  if (!Method) {
2760  Method = LookupMethodInQualifiedType(Sel, QClassTy, true);
2761  // warn if instance method found for a Class message.
2762  if (Method && !isMethodDeclaredInRootProtocol(*this, Method)) {
2763  Diag(SelLoc, diag::warn_instance_method_on_class_found)
2764  << Method->getSelector() << Sel;
2765  Diag(Method->getLocation(), diag::note_method_declared_at)
2766  << Method->getDeclName();
2767  }
2768  }
2769  } else {
2770  if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2771  if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) {
2772  // First check the public methods in the class interface.
2773  Method = ClassDecl->lookupClassMethod(Sel);
2774 
2775  if (!Method)
2776  Method = ClassDecl->lookupPrivateClassMethod(Sel);
2777  }
2778  if (Method && DiagnoseUseOfDecl(Method, SelLoc))
2779  return ExprError();
2780  }
2781  if (!Method) {
2782  // If not messaging 'self', look for any factory method named 'Sel'.
2783  if (!Receiver || !isSelfExpr(Receiver)) {
2784  // If no class (factory) method was found, check if an _instance_
2785  // method of the same name exists in the root class only.
2787  CollectMultipleMethodsInGlobalPool(Sel, Methods,
2788  false/*InstanceFirst*/,
2789  true/*CheckTheOther*/);
2790  if (!Methods.empty()) {
2791  // We choose the first method as the initial candidate, then try
2792  // to select a better one.
2793  Method = Methods[0];
2794 
2795  // If we find an instance method, emit waring.
2796  if (Method->isInstanceMethod()) {
2797  if (const ObjCInterfaceDecl *ID =
2798  dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext())) {
2799  if (ID->getSuperClass())
2800  Diag(SelLoc, diag::warn_root_inst_method_not_found)
2801  << Sel << SourceRange(LBracLoc, RBracLoc);
2802  }
2803  }
2804 
2805  if (ObjCMethodDecl *BestMethod =
2806  SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(),
2807  Methods))
2808  Method = BestMethod;
2809  }
2810  }
2811  }
2812  }
2813  } else {
2814  ObjCInterfaceDecl *ClassDecl = nullptr;
2815 
2816  // We allow sending a message to a qualified ID ("id<foo>"), which is ok as
2817  // long as one of the protocols implements the selector (if not, warn).
2818  // And as long as message is not deprecated/unavailable (warn if it is).
2819  if (const ObjCObjectPointerType *QIdTy
2820  = ReceiverType->getAsObjCQualifiedIdType()) {
2821  // Search protocols for instance methods.
2822  Method = LookupMethodInQualifiedType(Sel, QIdTy, true);
2823  if (!Method)
2824  Method = LookupMethodInQualifiedType(Sel, QIdTy, false);
2825  if (Method && DiagnoseUseOfDecl(Method, SelLoc))
2826  return ExprError();
2827  } else if (const ObjCObjectPointerType *OCIType
2828  = ReceiverType->getAsObjCInterfacePointerType()) {
2829  // We allow sending a message to a pointer to an interface (an object).
2830  ClassDecl = OCIType->getInterfaceDecl();
2831 
2832  // Try to complete the type. Under ARC, this is a hard error from which
2833  // we don't try to recover.
2834  // FIXME: In the non-ARC case, this will still be a hard error if the
2835  // definition is found in a module that's not visible.
2836  const ObjCInterfaceDecl *forwardClass = nullptr;
2837  if (RequireCompleteType(Loc, OCIType->getPointeeType(),
2838  getLangOpts().ObjCAutoRefCount
2839  ? diag::err_arc_receiver_forward_instance
2840  : diag::warn_receiver_forward_instance,
2841  Receiver? Receiver->getSourceRange()
2842  : SourceRange(SuperLoc))) {
2843  if (getLangOpts().ObjCAutoRefCount)
2844  return ExprError();
2845 
2846  forwardClass = OCIType->getInterfaceDecl();
2847  Diag(Receiver ? Receiver->getLocStart()
2848  : SuperLoc, diag::note_receiver_is_id);
2849  Method = nullptr;
2850  } else {
2851  Method = ClassDecl->lookupInstanceMethod(Sel);
2852  }
2853 
2854  if (!Method)
2855  // Search protocol qualifiers.
2856  Method = LookupMethodInQualifiedType(Sel, OCIType, true);
2857 
2858  if (!Method) {
2859  // If we have implementations in scope, check "private" methods.
2860  Method = ClassDecl->lookupPrivateMethod(Sel);
2861 
2862  if (!Method && getLangOpts().ObjCAutoRefCount) {
2863  Diag(SelLoc, diag::err_arc_may_not_respond)
2864  << OCIType->getPointeeType() << Sel << RecRange
2865  << SourceRange(SelectorLocs.front(), SelectorLocs.back());
2866  return ExprError();
2867  }
2868 
2869  if (!Method && (!Receiver || !isSelfExpr(Receiver))) {
2870  // If we still haven't found a method, look in the global pool. This
2871  // behavior isn't very desirable, however we need it for GCC
2872  // compatibility. FIXME: should we deviate??
2873  if (OCIType->qual_empty()) {
2875  CollectMultipleMethodsInGlobalPool(Sel, Methods,
2876  true/*InstanceFirst*/,
2877  false/*CheckTheOther*/);
2878  if (!Methods.empty()) {
2879  // We choose the first method as the initial candidate, then try
2880  // to select a better one.
2881  Method = Methods[0];
2882 
2883  if (ObjCMethodDecl *BestMethod =
2884  SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(),
2885  Methods))
2886  Method = BestMethod;
2887 
2888  AreMultipleMethodsInGlobalPool(Sel, Method,
2889  SourceRange(LBracLoc, RBracLoc),
2890  true/*receiverIdOrClass*/,
2891  Methods);
2892  }
2893  if (Method && !forwardClass)
2894  Diag(SelLoc, diag::warn_maynot_respond)
2895  << OCIType->getInterfaceDecl()->getIdentifier()
2896  << Sel << RecRange;
2897  }
2898  }
2899  }
2900  if (Method && DiagnoseUseOfDecl(Method, SelLoc, forwardClass))
2901  return ExprError();
2902  } else {
2903  // Reject other random receiver types (e.g. structs).
2904  Diag(Loc, diag::err_bad_receiver_type)
2905  << ReceiverType << Receiver->getSourceRange();
2906  return ExprError();
2907  }
2908  }
2909  }
2910 
2911  FunctionScopeInfo *DIFunctionScopeInfo =
2912  (Method && Method->getMethodFamily() == OMF_init)
2913  ? getEnclosingFunction() : nullptr;
2914 
2915  if (DIFunctionScopeInfo &&
2916  DIFunctionScopeInfo->ObjCIsDesignatedInit &&
2917  (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2918  bool isDesignatedInitChain = false;
2919  if (SuperLoc.isValid()) {
2920  if (const ObjCObjectPointerType *
2921  OCIType = ReceiverType->getAsObjCInterfacePointerType()) {
2922  if (const ObjCInterfaceDecl *ID = OCIType->getInterfaceDecl()) {
2923  // Either we know this is a designated initializer or we
2924  // conservatively assume it because we don't know for sure.
2925  if (!ID->declaresOrInheritsDesignatedInitializers() ||
2926  ID->isDesignatedInitializer(Sel)) {
2927  isDesignatedInitChain = true;
2928  DIFunctionScopeInfo->ObjCWarnForNoDesignatedInitChain = false;
2929  }
2930  }
2931  }
2932  }
2933  if (!isDesignatedInitChain) {
2934  const ObjCMethodDecl *InitMethod = nullptr;
2935  bool isDesignated =
2936  getCurMethodDecl()->isDesignatedInitializerForTheInterface(&InitMethod);
2937  assert(isDesignated && InitMethod);
2938  (void)isDesignated;
2939  Diag(SelLoc, SuperLoc.isValid() ?
2940  diag::warn_objc_designated_init_non_designated_init_call :
2941  diag::warn_objc_designated_init_non_super_designated_init_call);
2942  Diag(InitMethod->getLocation(),
2943  diag::note_objc_designated_init_marked_here);
2944  }
2945  }
2946 
2947  if (DIFunctionScopeInfo &&
2948  DIFunctionScopeInfo->ObjCIsSecondaryInit &&
2949  (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2950  if (SuperLoc.isValid()) {
2951  Diag(SelLoc, diag::warn_objc_secondary_init_super_init_call);
2952  } else {
2953  DIFunctionScopeInfo->ObjCWarnForNoInitDelegation = false;
2954  }
2955  }
2956 
2957  // Check the message arguments.
2958  unsigned NumArgs = ArgsIn.size();
2959  Expr **Args = ArgsIn.data();
2960  QualType ReturnType;
2961  ExprValueKind VK = VK_RValue;
2962  bool ClassMessage = (ReceiverType->isObjCClassType() ||
2963  ReceiverType->isObjCQualifiedClassType());
2964  if (CheckMessageArgumentTypes(ReceiverType, MultiExprArg(Args, NumArgs),
2965  Sel, SelectorLocs, Method,
2966  ClassMessage, SuperLoc.isValid(),
2967  LBracLoc, RBracLoc, RecRange, ReturnType, VK))
2968  return ExprError();
2969 
2970  if (Method && !Method->getReturnType()->isVoidType() &&
2971  RequireCompleteType(LBracLoc, Method->getReturnType(),
2972  diag::err_illegal_message_expr_incomplete_type))
2973  return ExprError();
2974 
2975  // In ARC, forbid the user from sending messages to
2976  // retain/release/autorelease/dealloc/retainCount explicitly.
2977  if (getLangOpts().ObjCAutoRefCount) {
2978  ObjCMethodFamily family =
2979  (Method ? Method->getMethodFamily() : Sel.getMethodFamily());
2980  switch (family) {
2981  case OMF_init:
2982  if (Method)
2983  checkInitMethod(Method, ReceiverType);
2984 
2985  case OMF_None:
2986  case OMF_alloc:
2987  case OMF_copy:
2988  case OMF_finalize:
2989  case OMF_mutableCopy:
2990  case OMF_new:
2991  case OMF_self:
2992  case OMF_initialize:
2993  break;
2994 
2995  case OMF_dealloc:
2996  case OMF_retain:
2997  case OMF_release:
2998  case OMF_autorelease:
2999  case OMF_retainCount:
3000  Diag(SelLoc, diag::err_arc_illegal_explicit_message)
3001  << Sel << RecRange;
3002  break;
3003 
3004  case OMF_performSelector:
3005  if (Method && NumArgs >= 1) {
3006  if (const auto *SelExp =
3007  dyn_cast<ObjCSelectorExpr>(Args[0]->IgnoreParens())) {
3008  Selector ArgSel = SelExp->getSelector();
3009  ObjCMethodDecl *SelMethod =
3010  LookupInstanceMethodInGlobalPool(ArgSel,
3011  SelExp->getSourceRange());
3012  if (!SelMethod)
3013  SelMethod =
3014  LookupFactoryMethodInGlobalPool(ArgSel,
3015  SelExp->getSourceRange());
3016  if (SelMethod) {
3017  ObjCMethodFamily SelFamily = SelMethod->getMethodFamily();
3018  switch (SelFamily) {
3019  case OMF_alloc:
3020  case OMF_copy:
3021  case OMF_mutableCopy:
3022  case OMF_new:
3023  case OMF_init:
3024  // Issue error, unless ns_returns_not_retained.
3025  if (!SelMethod->hasAttr<NSReturnsNotRetainedAttr>()) {
3026  // selector names a +1 method
3027  Diag(SelLoc,
3028  diag::err_arc_perform_selector_retains);
3029  Diag(SelMethod->getLocation(), diag::note_method_declared_at)
3030  << SelMethod->getDeclName();
3031  }
3032  break;
3033  default:
3034  // +0 call. OK. unless ns_returns_retained.
3035  if (SelMethod->hasAttr<NSReturnsRetainedAttr>()) {
3036  // selector names a +1 method
3037  Diag(SelLoc,
3038  diag::err_arc_perform_selector_retains);
3039  Diag(SelMethod->getLocation(), diag::note_method_declared_at)
3040  << SelMethod->getDeclName();
3041  }
3042  break;
3043  }
3044  }
3045  } else {
3046  // error (may leak).
3047  Diag(SelLoc, diag::warn_arc_perform_selector_leaks);
3048  Diag(Args[0]->getExprLoc(), diag::note_used_here);
3049  }
3050  }
3051  break;
3052  }
3053  }
3054 
3055  DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
3056 
3057  // Construct the appropriate ObjCMessageExpr instance.
3058  ObjCMessageExpr *Result;
3059  if (SuperLoc.isValid())
3060  Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
3061  SuperLoc, /*IsInstanceSuper=*/true,
3062  ReceiverType, Sel, SelectorLocs, Method,
3063  makeArrayRef(Args, NumArgs), RBracLoc,
3064  isImplicit);
3065  else {
3066  Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
3067  Receiver, Sel, SelectorLocs, Method,
3068  makeArrayRef(Args, NumArgs), RBracLoc,
3069  isImplicit);
3070  if (!isImplicit)
3071  checkCocoaAPI(*this, Result);
3072  }
3073  if (Method) {
3074  bool IsClassObjectCall = ClassMessage;
3075  // 'self' message receivers in class methods should be treated as message
3076  // sends to the class object in order for the semantic checks to be
3077  // performed correctly. Messages to 'super' already count as class messages,
3078  // so they don't need to be handled here.
3079  if (Receiver && isSelfExpr(Receiver)) {
3080  if (const auto *OPT = ReceiverType->getAs<ObjCObjectPointerType>()) {
3081  if (OPT->getObjectType()->isObjCClass()) {
3082  if (const auto *CurMeth = getCurMethodDecl()) {
3083  IsClassObjectCall = true;
3084  ReceiverType =
3085  Context.getObjCInterfaceType(CurMeth->getClassInterface());
3086  }
3087  }
3088  }
3089  }
3090  checkFoundationAPI(*this, SelLoc, Method, makeArrayRef(Args, NumArgs),
3091  ReceiverType, IsClassObjectCall);
3092  }
3093 
3094  if (getLangOpts().ObjCAutoRefCount) {
3095  // In ARC, annotate delegate init calls.
3096  if (Result->getMethodFamily() == OMF_init &&
3097  (SuperLoc.isValid() || isSelfExpr(Receiver))) {
3098  // Only consider init calls *directly* in init implementations,
3099  // not within blocks.
3100  ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(CurContext);
3101  if (method && method->getMethodFamily() == OMF_init) {
3102  // The implicit assignment to self means we also don't want to
3103  // consume the result.
3104  Result->setDelegateInitCall(true);
3105  return Result;
3106  }
3107  }
3108 
3109  // In ARC, check for message sends which are likely to introduce
3110  // retain cycles.
3111  checkRetainCycles(Result);
3112  }
3113 
3114  if (getLangOpts().ObjCWeak) {
3115  if (!isImplicit && Method) {
3116  if (const ObjCPropertyDecl *Prop = Method->findPropertyDecl()) {
3117  bool IsWeak =
3118  Prop->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak;
3119  if (!IsWeak && Sel.isUnarySelector())
3120  IsWeak = ReturnType.getObjCLifetime() & Qualifiers::OCL_Weak;
3121  if (IsWeak &&
3122  !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, LBracLoc))
3123  getCurFunction()->recordUseOfWeak(Result, Prop);
3124  }
3125  }
3126  }
3127 
3128  CheckObjCCircularContainer(Result);
3129 
3130  return MaybeBindToTemporary(Result);
3131 }
3132 
3134  if (ObjCSelectorExpr *OSE =
3135  dyn_cast<ObjCSelectorExpr>(Arg->IgnoreParenCasts())) {
3136  Selector Sel = OSE->getSelector();
3137  SourceLocation Loc = OSE->getAtLoc();
3138  auto Pos = S.ReferencedSelectors.find(Sel);
3139  if (Pos != S.ReferencedSelectors.end() && Pos->second == Loc)
3140  S.ReferencedSelectors.erase(Pos);
3141  }
3142 }
3143 
3144 // ActOnInstanceMessage - used for both unary and keyword messages.
3145 // ArgExprs is optional - if it is present, the number of expressions
3146 // is obtained from Sel.getNumArgs().
3148  Expr *Receiver,
3149  Selector Sel,
3150  SourceLocation LBracLoc,
3151  ArrayRef<SourceLocation> SelectorLocs,
3152  SourceLocation RBracLoc,
3153  MultiExprArg Args) {
3154  if (!Receiver)
3155  return ExprError();
3156 
3157  // A ParenListExpr can show up while doing error recovery with invalid code.
3158  if (isa<ParenListExpr>(Receiver)) {
3159  ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Receiver);
3160  if (Result.isInvalid()) return ExprError();
3161  Receiver = Result.get();
3162  }
3163 
3164  if (RespondsToSelectorSel.isNull()) {
3165  IdentifierInfo *SelectorId = &Context.Idents.get("respondsToSelector");
3166  RespondsToSelectorSel = Context.Selectors.getUnarySelector(SelectorId);
3167  }
3168  if (Sel == RespondsToSelectorSel)
3169  RemoveSelectorFromWarningCache(*this, Args[0]);
3170 
3171  return BuildInstanceMessage(Receiver, Receiver->getType(),
3172  /*SuperLoc=*/SourceLocation(), Sel,
3173  /*Method=*/nullptr, LBracLoc, SelectorLocs,
3174  RBracLoc, Args);
3175 }
3176 
3178  /// int, void, struct A
3180 
3181  /// id, void (^)()
3183 
3184  /// id*, id***, void (^*)(),
3186 
3187  /// void* might be a normal C type, or it might a CF type.
3189 
3190  /// struct A*
3192 };
3193 
3195  return (ACTC == ACTC_retainable ||
3196  ACTC == ACTC_coreFoundation ||
3197  ACTC == ACTC_voidPtr);
3198 }
3199 
3201  return ACTC == ACTC_none ||
3202  ACTC == ACTC_voidPtr ||
3203  ACTC == ACTC_coreFoundation;
3204 }
3205 
3207  bool isIndirect = false;
3208 
3209  // Ignore an outermost reference type.
3210  if (const ReferenceType *ref = type->getAs<ReferenceType>()) {
3211  type = ref->getPointeeType();
3212  isIndirect = true;
3213  }
3214 
3215  // Drill through pointers and arrays recursively.
3216  while (true) {
3217  if (const PointerType *ptr = type->getAs<PointerType>()) {
3218  type = ptr->getPointeeType();
3219 
3220  // The first level of pointer may be the innermost pointer on a CF type.
3221  if (!isIndirect) {
3222  if (type->isVoidType()) return ACTC_voidPtr;
3223  if (type->isRecordType()) return ACTC_coreFoundation;
3224  }
3225  } else if (const ArrayType *array = type->getAsArrayTypeUnsafe()) {
3226  type = QualType(array->getElementType()->getBaseElementTypeUnsafe(), 0);
3227  } else {
3228  break;
3229  }
3230  isIndirect = true;
3231  }
3232 
3233  if (isIndirect) {
3234  if (type->isObjCARCBridgableType())
3235  return ACTC_indirectRetainable;
3236  return ACTC_none;
3237  }
3238 
3239  if (type->isObjCARCBridgableType())
3240  return ACTC_retainable;
3241 
3242  return ACTC_none;
3243 }
3244 
3245 namespace {
3246  /// A result from the cast checker.
3247  enum ACCResult {
3248  /// Cannot be casted.
3249  ACC_invalid,
3250 
3251  /// Can be safely retained or not retained.
3252  ACC_bottom,
3253 
3254  /// Can be casted at +0.
3255  ACC_plusZero,
3256 
3257  /// Can be casted at +1.
3258  ACC_plusOne
3259  };
3260  ACCResult merge(ACCResult left, ACCResult right) {
3261  if (left == right) return left;
3262  if (left == ACC_bottom) return right;
3263  if (right == ACC_bottom) return left;
3264  return ACC_invalid;
3265  }
3266 
3267  /// A checker which white-lists certain expressions whose conversion
3268  /// to or from retainable type would otherwise be forbidden in ARC.
3269  class ARCCastChecker : public StmtVisitor<ARCCastChecker, ACCResult> {
3271 
3272  ASTContext &Context;
3273  ARCConversionTypeClass SourceClass;
3274  ARCConversionTypeClass TargetClass;
3275  bool Diagnose;
3276 
3277  static bool isCFType(QualType type) {
3278  // Someday this can use ns_bridged. For now, it has to do this.
3279  return type->isCARCBridgableType();
3280  }
3281 
3282  public:
3283  ARCCastChecker(ASTContext &Context, ARCConversionTypeClass source,
3284  ARCConversionTypeClass target, bool diagnose)
3285  : Context(Context), SourceClass(source), TargetClass(target),
3286  Diagnose(diagnose) {}
3287 
3288  using super::Visit;
3289  ACCResult Visit(Expr *e) {
3290  return super::Visit(e->IgnoreParens());
3291  }
3292 
3293  ACCResult VisitStmt(Stmt *s) {
3294  return ACC_invalid;
3295  }
3296 
3297  /// Null pointer constants can be casted however you please.
3298  ACCResult VisitExpr(Expr *e) {
3300  return ACC_bottom;
3301  return ACC_invalid;
3302  }
3303 
3304  /// Objective-C string literals can be safely casted.
3305  ACCResult VisitObjCStringLiteral(ObjCStringLiteral *e) {
3306  // If we're casting to any retainable type, go ahead. Global
3307  // strings are immune to retains, so this is bottom.
3308  if (isAnyRetainable(TargetClass)) return ACC_bottom;
3309 
3310  return ACC_invalid;
3311  }
3312 
3313  /// Look through certain implicit and explicit casts.
3314  ACCResult VisitCastExpr(CastExpr *e) {
3315  switch (e->getCastKind()) {
3316  case CK_NullToPointer:
3317  return ACC_bottom;
3318 
3319  case CK_NoOp:
3320  case CK_LValueToRValue:
3321  case CK_BitCast:
3322  case CK_CPointerToObjCPointerCast:
3323  case CK_BlockPointerToObjCPointerCast:
3324  case CK_AnyPointerToBlockPointerCast:
3325  return Visit(e->getSubExpr());
3326 
3327  default:
3328  return ACC_invalid;
3329  }
3330  }
3331 
3332  /// Look through unary extension.
3333  ACCResult VisitUnaryExtension(UnaryOperator *e) {
3334  return Visit(e->getSubExpr());
3335  }
3336 
3337  /// Ignore the LHS of a comma operator.
3338  ACCResult VisitBinComma(BinaryOperator *e) {
3339  return Visit(e->getRHS());
3340  }
3341 
3342  /// Conditional operators are okay if both sides are okay.
3343  ACCResult VisitConditionalOperator(ConditionalOperator *e) {
3344  ACCResult left = Visit(e->getTrueExpr());
3345  if (left == ACC_invalid) return ACC_invalid;
3346  return merge(left, Visit(e->getFalseExpr()));
3347  }
3348 
3349  /// Look through pseudo-objects.
3350  ACCResult VisitPseudoObjectExpr(PseudoObjectExpr *e) {
3351  // If we're getting here, we should always have a result.
3352  return Visit(e->getResultExpr());
3353  }
3354 
3355  /// Statement expressions are okay if their result expression is okay.
3356  ACCResult VisitStmtExpr(StmtExpr *e) {
3357  return Visit(e->getSubStmt()->body_back());
3358  }
3359 
3360  /// Some declaration references are okay.
3361  ACCResult VisitDeclRefExpr(DeclRefExpr *e) {
3362  VarDecl *var = dyn_cast<VarDecl>(e->getDecl());
3363  // References to global constants are okay.
3364  if (isAnyRetainable(TargetClass) &&
3365  isAnyRetainable(SourceClass) &&
3366  var &&
3367  !var->hasDefinition(Context) &&
3368  var->getType().isConstQualified()) {
3369 
3370  // In system headers, they can also be assumed to be immune to retains.
3371  // These are things like 'kCFStringTransformToLatin'.
3372  if (Context.getSourceManager().isInSystemHeader(var->getLocation()))
3373  return ACC_bottom;
3374 
3375  return ACC_plusZero;
3376  }
3377 
3378  // Nothing else.
3379  return ACC_invalid;
3380  }
3381 
3382  /// Some calls are okay.
3383  ACCResult VisitCallExpr(CallExpr *e) {
3384  if (FunctionDecl *fn = e->getDirectCallee())
3385  if (ACCResult result = checkCallToFunction(fn))
3386  return result;
3387 
3388  return super::VisitCallExpr(e);
3389  }
3390 
3391  ACCResult checkCallToFunction(FunctionDecl *fn) {
3392  // Require a CF*Ref return type.
3393  if (!isCFType(fn->getReturnType()))
3394  return ACC_invalid;
3395 
3396  if (!isAnyRetainable(TargetClass))
3397  return ACC_invalid;
3398 
3399  // Honor an explicit 'not retained' attribute.
3400  if (fn->hasAttr<CFReturnsNotRetainedAttr>())
3401  return ACC_plusZero;
3402 
3403  // Honor an explicit 'retained' attribute, except that for
3404  // now we're not going to permit implicit handling of +1 results,
3405  // because it's a bit frightening.
3406  if (fn->hasAttr<CFReturnsRetainedAttr>())
3407  return Diagnose ? ACC_plusOne
3408  : ACC_invalid; // ACC_plusOne if we start accepting this
3409 
3410  // Recognize this specific builtin function, which is used by CFSTR.
3411  unsigned builtinID = fn->getBuiltinID();
3412  if (builtinID == Builtin::BI__builtin___CFStringMakeConstantString)
3413  return ACC_bottom;
3414 
3415  // Otherwise, don't do anything implicit with an unaudited function.
3416  if (!fn->hasAttr<CFAuditedTransferAttr>())
3417  return ACC_invalid;
3418 
3419  // Otherwise, it's +0 unless it follows the create convention.
3421  return Diagnose ? ACC_plusOne
3422  : ACC_invalid; // ACC_plusOne if we start accepting this
3423 
3424  return ACC_plusZero;
3425  }
3426 
3427  ACCResult VisitObjCMessageExpr(ObjCMessageExpr *e) {
3428  return checkCallToMethod(e->getMethodDecl());
3429  }
3430 
3431  ACCResult VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *e) {
3432  ObjCMethodDecl *method;
3433  if (e->isExplicitProperty())
3434  method = e->getExplicitProperty()->getGetterMethodDecl();
3435  else
3436  method = e->getImplicitPropertyGetter();
3437  return checkCallToMethod(method);
3438  }
3439 
3440  ACCResult checkCallToMethod(ObjCMethodDecl *method) {
3441  if (!method) return ACC_invalid;
3442 
3443  // Check for message sends to functions returning CF types. We
3444  // just obey the Cocoa conventions with these, even though the
3445  // return type is CF.
3446  if (!isAnyRetainable(TargetClass) || !isCFType(method->getReturnType()))
3447  return ACC_invalid;
3448 
3449  // If the method is explicitly marked not-retained, it's +0.
3450  if (method->hasAttr<CFReturnsNotRetainedAttr>())
3451  return ACC_plusZero;
3452 
3453  // If the method is explicitly marked as returning retained, or its
3454  // selector follows a +1 Cocoa convention, treat it as +1.
3455  if (method->hasAttr<CFReturnsRetainedAttr>())
3456  return ACC_plusOne;
3457 
3458  switch (method->getSelector().getMethodFamily()) {
3459  case OMF_alloc:
3460  case OMF_copy:
3461  case OMF_mutableCopy:
3462  case OMF_new:
3463  return ACC_plusOne;
3464 
3465  default:
3466  // Otherwise, treat it as +0.
3467  return ACC_plusZero;
3468  }
3469  }
3470  };
3471 } // end anonymous namespace
3472 
3473 bool Sema::isKnownName(StringRef name) {
3474  if (name.empty())
3475  return false;
3476  LookupResult R(*this, &Context.Idents.get(name), SourceLocation(),
3478  return LookupName(R, TUScope, false);
3479 }
3480 
3482  DiagnosticBuilder &DiagB,
3484  SourceLocation afterLParen,
3485  QualType castType,
3486  Expr *castExpr,
3487  Expr *realCast,
3488  const char *bridgeKeyword,
3489  const char *CFBridgeName) {
3490  // We handle C-style and implicit casts here.
3491  switch (CCK) {
3493  case Sema::CCK_CStyleCast:
3494  case Sema::CCK_OtherCast:
3495  break;
3497  return;
3498  }
3499 
3500  if (CFBridgeName) {
3501  if (CCK == Sema::CCK_OtherCast) {
3502  if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3503  SourceRange range(NCE->getOperatorLoc(),
3504  NCE->getAngleBrackets().getEnd());
3505  SmallString<32> BridgeCall;
3506 
3508  char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3509  if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3510  BridgeCall += ' ';
3511 
3512  BridgeCall += CFBridgeName;
3513  DiagB.AddFixItHint(FixItHint::CreateReplacement(range, BridgeCall));
3514  }
3515  return;
3516  }
3517  Expr *castedE = castExpr;
3518  if (CStyleCastExpr *CCE = dyn_cast<CStyleCastExpr>(castedE))
3519  castedE = CCE->getSubExpr();
3520  castedE = castedE->IgnoreImpCasts();
3521  SourceRange range = castedE->getSourceRange();
3522 
3523  SmallString<32> BridgeCall;
3524 
3526  char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3527  if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3528  BridgeCall += ' ';
3529 
3530  BridgeCall += CFBridgeName;
3531 
3532  if (isa<ParenExpr>(castedE)) {
3534  BridgeCall));
3535  } else {
3536  BridgeCall += '(';
3538  BridgeCall));
3540  S.getLocForEndOfToken(range.getEnd()),
3541  ")"));
3542  }
3543  return;
3544  }
3545 
3546  if (CCK == Sema::CCK_CStyleCast) {
3547  DiagB.AddFixItHint(FixItHint::CreateInsertion(afterLParen, bridgeKeyword));
3548  } else if (CCK == Sema::CCK_OtherCast) {
3549  if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3550  std::string castCode = "(";
3551  castCode += bridgeKeyword;
3552  castCode += castType.getAsString();
3553  castCode += ")";
3554  SourceRange Range(NCE->getOperatorLoc(),
3555  NCE->getAngleBrackets().getEnd());
3556  DiagB.AddFixItHint(FixItHint::CreateReplacement(Range, castCode));
3557  }
3558  } else {
3559  std::string castCode = "(";
3560  castCode += bridgeKeyword;
3561  castCode += castType.getAsString();
3562  castCode += ")";
3563  Expr *castedE = castExpr->IgnoreImpCasts();
3564  SourceRange range = castedE->getSourceRange();
3565  if (isa<ParenExpr>(castedE)) {
3567  castCode));
3568  } else {
3569  castCode += "(";
3571  castCode));
3573  S.getLocForEndOfToken(range.getEnd()),
3574  ")"));
3575  }
3576  }
3577 }
3578 
3579 template <typename T>
3580 static inline T *getObjCBridgeAttr(const TypedefType *TD) {
3581  TypedefNameDecl *TDNDecl = TD->getDecl();
3582  QualType QT = TDNDecl->getUnderlyingType();
3583  if (QT->isPointerType()) {
3584  QT = QT->getPointeeType();
3585  if (const RecordType *RT = QT->getAs<RecordType>())
3586  if (RecordDecl *RD = RT->getDecl()->getMostRecentDecl())
3587  return RD->getAttr<T>();
3588  }
3589  return nullptr;
3590 }
3591 
3592 static ObjCBridgeRelatedAttr *ObjCBridgeRelatedAttrFromType(QualType T,
3593  TypedefNameDecl *&TDNDecl) {
3594  while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3595  TDNDecl = TD->getDecl();
3596  if (ObjCBridgeRelatedAttr *ObjCBAttr =
3597  getObjCBridgeAttr<ObjCBridgeRelatedAttr>(TD))
3598  return ObjCBAttr;
3599  T = TDNDecl->getUnderlyingType();
3600  }
3601  return nullptr;
3602 }
3603 
3604 static void
3606  QualType castType, ARCConversionTypeClass castACTC,
3607  Expr *castExpr, Expr *realCast,
3608  ARCConversionTypeClass exprACTC,
3610  SourceLocation loc =
3611  (castRange.isValid() ? castRange.getBegin() : castExpr->getExprLoc());
3612 
3614  UnavailableAttr::IR_ARCForbiddenConversion))
3615  return;
3616 
3617  QualType castExprType = castExpr->getType();
3618  // Defer emitting a diagnostic for bridge-related casts; that will be
3619  // handled by CheckObjCBridgeRelatedConversions.
3620  TypedefNameDecl *TDNDecl = nullptr;
3621  if ((castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable &&
3622  ObjCBridgeRelatedAttrFromType(castType, TDNDecl)) ||
3623  (exprACTC == ACTC_coreFoundation && castACTC == ACTC_retainable &&
3624  ObjCBridgeRelatedAttrFromType(castExprType, TDNDecl)))
3625  return;
3626 
3627  unsigned srcKind = 0;
3628  switch (exprACTC) {
3629  case ACTC_none:
3630  case ACTC_coreFoundation:
3631  case ACTC_voidPtr:
3632  srcKind = (castExprType->isPointerType() ? 1 : 0);
3633  break;
3634  case ACTC_retainable:
3635  srcKind = (castExprType->isBlockPointerType() ? 2 : 3);
3636  break;
3638  srcKind = 4;
3639  break;
3640  }
3641 
3642  // Check whether this could be fixed with a bridge cast.
3643  SourceLocation afterLParen = S.getLocForEndOfToken(castRange.getBegin());
3644  SourceLocation noteLoc = afterLParen.isValid() ? afterLParen : loc;
3645 
3646  // Bridge from an ARC type to a CF type.
3647  if (castACTC == ACTC_retainable && isAnyRetainable(exprACTC)) {
3648 
3649  S.Diag(loc, diag::err_arc_cast_requires_bridge)
3650  << unsigned(CCK == Sema::CCK_ImplicitConversion) // cast|implicit
3651  << 2 // of C pointer type
3652  << castExprType
3653  << unsigned(castType->isBlockPointerType()) // to ObjC|block type
3654  << castType
3655  << castRange
3656  << castExpr->getSourceRange();
3657  bool br = S.isKnownName("CFBridgingRelease");
3658  ACCResult CreateRule =
3659  ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3660  assert(CreateRule != ACC_bottom && "This cast should already be accepted.");
3661  if (CreateRule != ACC_plusOne)
3662  {
3663  DiagnosticBuilder DiagB =
3664  (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3665  : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3666 
3667  addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3668  castType, castExpr, realCast, "__bridge ",
3669  nullptr);
3670  }
3671  if (CreateRule != ACC_plusZero)
3672  {
3673  DiagnosticBuilder DiagB =
3674  (CCK == Sema::CCK_OtherCast && !br) ?
3675  S.Diag(noteLoc, diag::note_arc_cstyle_bridge_transfer) << castExprType :
3676  S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3677  diag::note_arc_bridge_transfer)
3678  << castExprType << br;
3679 
3680  addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3681  castType, castExpr, realCast, "__bridge_transfer ",
3682  br ? "CFBridgingRelease" : nullptr);
3683  }
3684 
3685  return;
3686  }
3687 
3688  // Bridge from a CF type to an ARC type.
3689  if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC)) {
3690  bool br = S.isKnownName("CFBridgingRetain");
3691  S.Diag(loc, diag::err_arc_cast_requires_bridge)
3692  << unsigned(CCK == Sema::CCK_ImplicitConversion) // cast|implicit
3693  << unsigned(castExprType->isBlockPointerType()) // of ObjC|block type
3694  << castExprType
3695  << 2 // to C pointer type
3696  << castType
3697  << castRange
3698  << castExpr->getSourceRange();
3699  ACCResult CreateRule =
3700  ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3701  assert(CreateRule != ACC_bottom && "This cast should already be accepted.");
3702  if (CreateRule != ACC_plusOne)
3703  {
3704  DiagnosticBuilder DiagB =
3705  (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3706  : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3707  addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3708  castType, castExpr, realCast, "__bridge ",
3709  nullptr);
3710  }
3711  if (CreateRule != ACC_plusZero)
3712  {
3713  DiagnosticBuilder DiagB =
3714  (CCK == Sema::CCK_OtherCast && !br) ?
3715  S.Diag(noteLoc, diag::note_arc_cstyle_bridge_retained) << castType :
3716  S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3717  diag::note_arc_bridge_retained)
3718  << castType << br;
3719 
3720  addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3721  castType, castExpr, realCast, "__bridge_retained ",
3722  br ? "CFBridgingRetain" : nullptr);
3723  }
3724 
3725  return;
3726  }
3727 
3728  S.Diag(loc, diag::err_arc_mismatched_cast)
3729  << (CCK != Sema::CCK_ImplicitConversion)
3730  << srcKind << castExprType << castType
3731  << castRange << castExpr->getSourceRange();
3732 }
3733 
3734 template <typename TB>
3735 static bool CheckObjCBridgeNSCast(Sema &S, QualType castType, Expr *castExpr,
3736  bool &HadTheAttribute, bool warn) {
3737  QualType T = castExpr->getType();
3738  HadTheAttribute = false;
3739  while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3740  TypedefNameDecl *TDNDecl = TD->getDecl();
3741  if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3742  if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3743  HadTheAttribute = true;
3744  if (Parm->isStr("id"))
3745  return true;
3746 
3747  NamedDecl *Target = nullptr;
3748  // Check for an existing type with this name.
3751  if (S.LookupName(R, S.TUScope)) {
3752  Target = R.getFoundDecl();
3753  if (Target && isa<ObjCInterfaceDecl>(Target)) {
3754  ObjCInterfaceDecl *ExprClass = cast<ObjCInterfaceDecl>(Target);
3755  if (const ObjCObjectPointerType *InterfacePointerType =
3756  castType->getAsObjCInterfacePointerType()) {
3757  ObjCInterfaceDecl *CastClass
3758  = InterfacePointerType->getObjectType()->getInterface();
3759  if ((CastClass == ExprClass) ||
3760  (CastClass && CastClass->isSuperClassOf(ExprClass)))
3761  return true;
3762  if (warn)
3763  S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge)
3764  << T << Target->getName() << castType->getPointeeType();
3765  return false;
3766  } else if (castType->isObjCIdType() ||
3768  castType, ExprClass)))
3769  // ok to cast to 'id'.
3770  // casting to id<p-list> is ok if bridge type adopts all of
3771  // p-list protocols.
3772  return true;
3773  else {
3774  if (warn) {
3775  S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge)
3776  << T << Target->getName() << castType;
3777  S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3778  S.Diag(Target->getLocStart(), diag::note_declared_at);
3779  }
3780  return false;
3781  }
3782  }
3783  } else if (!castType->isObjCIdType()) {
3784  S.Diag(castExpr->getLocStart(), diag::err_objc_cf_bridged_not_interface)
3785  << castExpr->getType() << Parm;
3786  S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3787  if (Target)
3788  S.Diag(Target->getLocStart(), diag::note_declared_at);
3789  }
3790  return true;
3791  }
3792  return false;
3793  }
3794  T = TDNDecl->getUnderlyingType();
3795  }
3796  return true;
3797 }
3798 
3799 template <typename TB>
3800 static bool CheckObjCBridgeCFCast(Sema &S, QualType castType, Expr *castExpr,
3801  bool &HadTheAttribute, bool warn) {
3802  QualType T = castType;
3803  HadTheAttribute = false;
3804  while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3805  TypedefNameDecl *TDNDecl = TD->getDecl();
3806  if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3807  if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3808  HadTheAttribute = true;
3809  if (Parm->isStr("id"))
3810  return true;
3811 
3812  NamedDecl *Target = nullptr;
3813  // Check for an existing type with this name.
3816  if (S.LookupName(R, S.TUScope)) {
3817  Target = R.getFoundDecl();
3818  if (Target && isa<ObjCInterfaceDecl>(Target)) {
3819  ObjCInterfaceDecl *CastClass = cast<ObjCInterfaceDecl>(Target);
3820  if (const ObjCObjectPointerType *InterfacePointerType =
3821  castExpr->getType()->getAsObjCInterfacePointerType()) {
3822  ObjCInterfaceDecl *ExprClass
3823  = InterfacePointerType->getObjectType()->getInterface();
3824  if ((CastClass == ExprClass) ||
3825  (ExprClass && CastClass->isSuperClassOf(ExprClass)))
3826  return true;
3827  if (warn) {
3828  S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge_to_cf)
3829  << castExpr->getType()->getPointeeType() << T;
3830  S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3831  }
3832  return false;
3833  } else if (castExpr->getType()->isObjCIdType() ||
3835  castExpr->getType(), CastClass)))
3836  // ok to cast an 'id' expression to a CFtype.
3837  // ok to cast an 'id<plist>' expression to CFtype provided plist
3838  // adopts all of CFtype's ObjetiveC's class plist.
3839  return true;
3840  else {
3841  if (warn) {
3842  S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge_to_cf)
3843  << castExpr->getType() << castType;
3844  S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3845  S.Diag(Target->getLocStart(), diag::note_declared_at);
3846  }
3847  return false;
3848  }
3849  }
3850  }
3851  S.Diag(castExpr->getLocStart(), diag::err_objc_ns_bridged_invalid_cfobject)
3852  << castExpr->getType() << castType;
3853  S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3854  if (Target)
3855  S.Diag(Target->getLocStart(), diag::note_declared_at);
3856  return true;
3857  }
3858  return false;
3859  }
3860  T = TDNDecl->getUnderlyingType();
3861  }
3862  return true;
3863 }
3864 
3866  if (!getLangOpts().ObjC1)
3867  return;
3868  // warn in presence of __bridge casting to or from a toll free bridge cast.
3871  if (castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) {
3872  bool HasObjCBridgeAttr;
3873  bool ObjCBridgeAttrWillNotWarn =
3874  CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3875  false);
3876  if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
3877  return;
3878  bool HasObjCBridgeMutableAttr;
3879  bool ObjCBridgeMutableAttrWillNotWarn =
3880  CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3881  HasObjCBridgeMutableAttr, false);
3882  if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
3883  return;
3884 
3885  if (HasObjCBridgeAttr)
3886  CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3887  true);
3888  else if (HasObjCBridgeMutableAttr)
3889  CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3890  HasObjCBridgeMutableAttr, true);
3891  }
3892  else if (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable) {
3893  bool HasObjCBridgeAttr;
3894  bool ObjCBridgeAttrWillNotWarn =
3895  CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3896  false);
3897  if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
3898  return;
3899  bool HasObjCBridgeMutableAttr;
3900  bool ObjCBridgeMutableAttrWillNotWarn =
3901  CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3902  HasObjCBridgeMutableAttr, false);
3903  if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
3904  return;
3905 
3906  if (HasObjCBridgeAttr)
3907  CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3908  true);
3909  else if (HasObjCBridgeMutableAttr)
3910  CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3911  HasObjCBridgeMutableAttr, true);
3912  }
3913 }
3914 
3916  QualType SrcType = castExpr->getType();
3917  if (ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(castExpr)) {
3918  if (PRE->isExplicitProperty()) {
3919  if (ObjCPropertyDecl *PDecl = PRE->getExplicitProperty())
3920  SrcType = PDecl->getType();
3921  }
3922  else if (PRE->isImplicitProperty()) {
3923  if (ObjCMethodDecl *Getter = PRE->getImplicitPropertyGetter())
3924  SrcType = Getter->getReturnType();
3925  }
3926  }
3927 
3929  ARCConversionTypeClass castExprACTC = classifyTypeForARCConversion(castType);
3930  if (srcExprACTC != ACTC_retainable || castExprACTC != ACTC_coreFoundation)
3931  return;
3932  CheckObjCBridgeRelatedConversions(castExpr->getLocStart(),
3933  castType, SrcType, castExpr);
3934 }
3935 
3937  CastKind &Kind) {
3938  if (!getLangOpts().ObjC1)
3939  return false;
3940  ARCConversionTypeClass exprACTC =
3943  if ((castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) ||
3944  (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable)) {
3945  CheckTollFreeBridgeCast(castType, castExpr);
3946  Kind = (castACTC == ACTC_coreFoundation) ? CK_BitCast
3947  : CK_CPointerToObjCPointerCast;
3948  return true;
3949  }
3950  return false;
3951 }
3952 
3954  QualType DestType, QualType SrcType,
3955  ObjCInterfaceDecl *&RelatedClass,
3956  ObjCMethodDecl *&ClassMethod,
3957  ObjCMethodDecl *&InstanceMethod,
3958  TypedefNameDecl *&TDNDecl,
3959  bool CfToNs, bool Diagnose) {
3960  QualType T = CfToNs ? SrcType : DestType;
3961  ObjCBridgeRelatedAttr *ObjCBAttr = ObjCBridgeRelatedAttrFromType(T, TDNDecl);
3962  if (!ObjCBAttr)
3963  return false;
3964 
3965  IdentifierInfo *RCId = ObjCBAttr->getRelatedClass();
3966  IdentifierInfo *CMId = ObjCBAttr->getClassMethod();
3967  IdentifierInfo *IMId = ObjCBAttr->getInstanceMethod();
3968  if (!RCId)
3969  return false;
3970  NamedDecl *Target = nullptr;
3971  // Check for an existing type with this name.
3972  LookupResult R(*this, DeclarationName(RCId), SourceLocation(),
3974  if (!LookupName(R, TUScope)) {
3975  if (Diagnose) {
3976  Diag(Loc, diag::err_objc_bridged_related_invalid_class) << RCId
3977  << SrcType << DestType;
3978  Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3979  }
3980  return false;
3981  }
3982  Target = R.getFoundDecl();
3983  if (Target && isa<ObjCInterfaceDecl>(Target))
3984  RelatedClass = cast<ObjCInterfaceDecl>(Target);
3985  else {
3986  if (Diagnose) {
3987  Diag(Loc, diag::err_objc_bridged_related_invalid_class_name) << RCId
3988  << SrcType << DestType;
3989  Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3990  if (Target)
3991  Diag(Target->getLocStart(), diag::note_declared_at);
3992  }
3993  return false;
3994  }
3995 
3996  // Check for an existing class method with the given selector name.
3997  if (CfToNs && CMId) {
3998  Selector Sel = Context.Selectors.getUnarySelector(CMId);
3999  ClassMethod = RelatedClass->lookupMethod(Sel, false);
4000  if (!ClassMethod) {
4001  if (Diagnose) {
4002  Diag(Loc, diag::err_objc_bridged_related_known_method)
4003  << SrcType << DestType << Sel << false;
4004  Diag(TDNDecl->getLocStart(), diag::note_declared_at);
4005  }
4006  return false;
4007  }
4008  }
4009 
4010  // Check for an existing instance method with the given selector name.
4011  if (!CfToNs && IMId) {
4012  Selector Sel = Context.Selectors.getNullarySelector(IMId);
4013  InstanceMethod = RelatedClass->lookupMethod(Sel, true);
4014  if (!InstanceMethod) {
4015  if (Diagnose) {
4016  Diag(Loc, diag::err_objc_bridged_related_known_method)
4017  << SrcType << DestType << Sel << true;
4018  Diag(TDNDecl->getLocStart(), diag::note_declared_at);
4019  }
4020  return false;
4021  }
4022  }
4023  return true;
4024 }
4025 
4026 bool
4028  QualType DestType, QualType SrcType,
4029  Expr *&SrcExpr, bool Diagnose) {
4031  ARCConversionTypeClass lhsExprACTC = classifyTypeForARCConversion(DestType);
4032  bool CfToNs = (rhsExprACTC == ACTC_coreFoundation && lhsExprACTC == ACTC_retainable);
4033  bool NsToCf = (rhsExprACTC == ACTC_retainable && lhsExprACTC == ACTC_coreFoundation);
4034  if (!CfToNs && !NsToCf)
4035  return false;
4036 
4037  ObjCInterfaceDecl *RelatedClass;
4038  ObjCMethodDecl *ClassMethod = nullptr;
4039  ObjCMethodDecl *InstanceMethod = nullptr;
4040  TypedefNameDecl *TDNDecl = nullptr;
4041  if (!checkObjCBridgeRelatedComponents(Loc, DestType, SrcType, RelatedClass,
4042  ClassMethod, InstanceMethod, TDNDecl,
4043  CfToNs, Diagnose))
4044  return false;
4045 
4046  if (CfToNs) {
4047  // Implicit conversion from CF to ObjC object is needed.
4048  if (ClassMethod) {
4049  if (Diagnose) {
4050  std::string ExpressionString = "[";
4051  ExpressionString += RelatedClass->getNameAsString();
4052  ExpressionString += " ";
4053  ExpressionString += ClassMethod->getSelector().getAsString();
4054  SourceLocation SrcExprEndLoc = getLocForEndOfToken(SrcExpr->getLocEnd());
4055  // Provide a fixit: [RelatedClass ClassMethod SrcExpr]
4056  Diag(Loc, diag::err_objc_bridged_related_known_method)
4057  << SrcType << DestType << ClassMethod->getSelector() << false
4058  << FixItHint::CreateInsertion(SrcExpr->getLocStart(), ExpressionString)
4059  << FixItHint::CreateInsertion(SrcExprEndLoc, "]");
4060  Diag(RelatedClass->getLocStart(), diag::note_declared_at);
4061  Diag(TDNDecl->getLocStart(), diag::note_declared_at);
4062 
4063  QualType receiverType = Context.getObjCInterfaceType(RelatedClass);
4064  // Argument.
4065  Expr *args[] = { SrcExpr };
4066  ExprResult msg = BuildClassMessageImplicit(receiverType, false,
4067  ClassMethod->getLocation(),
4068  ClassMethod->getSelector(), ClassMethod,
4069  MultiExprArg(args, 1));
4070  SrcExpr = msg.get();
4071  }
4072  return true;
4073  }
4074  }
4075  else {
4076  // Implicit conversion from ObjC type to CF object is needed.
4077  if (InstanceMethod) {
4078  if (Diagnose) {
4079  std::string ExpressionString;
4080  SourceLocation SrcExprEndLoc =
4081  getLocForEndOfToken(SrcExpr->getLocEnd());
4082  if (InstanceMethod->isPropertyAccessor())
4083  if (const ObjCPropertyDecl *PDecl =
4084  InstanceMethod->findPropertyDecl()) {
4085  // fixit: ObjectExpr.propertyname when it is aproperty accessor.
4086  ExpressionString = ".";
4087  ExpressionString += PDecl->getNameAsString();
4088  Diag(Loc, diag::err_objc_bridged_related_known_method)
4089  << SrcType << DestType << InstanceMethod->getSelector() << true
4090  << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
4091  }
4092  if (ExpressionString.empty()) {
4093  // Provide a fixit: [ObjectExpr InstanceMethod]
4094  ExpressionString = " ";
4095  ExpressionString += InstanceMethod->getSelector().getAsString();
4096  ExpressionString += "]";
4097 
4098  Diag(Loc, diag::err_objc_bridged_related_known_method)
4099  << SrcType << DestType << InstanceMethod->getSelector() << true
4100  << FixItHint::CreateInsertion(SrcExpr->getLocStart(), "[")
4101  << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
4102  }
4103  Diag(RelatedClass->getLocStart(), diag::note_declared_at);
4104  Diag(TDNDecl->getLocStart(), diag::note_declared_at);
4105 
4106  ExprResult msg =
4107  BuildInstanceMessageImplicit(SrcExpr, SrcType,
4108  InstanceMethod->getLocation(),
4109  InstanceMethod->getSelector(),
4110  InstanceMethod, None);
4111  SrcExpr = msg.get();
4112  }
4113  return true;
4114  }
4115  }
4116  return false;
4117 }
4118 
4122  bool Diagnose, bool DiagnoseCFAudited,
4123  BinaryOperatorKind Opc) {
4124  QualType castExprType = castExpr->getType();
4125 
4126  // For the purposes of the classification, we assume reference types
4127  // will bind to temporaries.
4128  QualType effCastType = castType;
4129  if (const ReferenceType *ref = castType->getAs<ReferenceType>())
4130  effCastType = ref->getPointeeType();
4131 
4132  ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExprType);
4133  ARCConversionTypeClass castACTC = classifyTypeForARCConversion(effCastType);
4134  if (exprACTC == castACTC) {
4135  // Check for viability and report error if casting an rvalue to a
4136  // life-time qualifier.
4137  if (castACTC == ACTC_retainable &&
4138  (CCK == CCK_CStyleCast || CCK == CCK_OtherCast) &&
4139  castType != castExprType) {
4140  const Type *DT = castType.getTypePtr();
4141  QualType QDT = castType;
4142  // We desugar some types but not others. We ignore those
4143  // that cannot happen in a cast; i.e. auto, and those which
4144  // should not be de-sugared; i.e typedef.
4145  if (const ParenType *PT = dyn_cast<ParenType>(DT))
4146  QDT = PT->desugar();
4147  else if (const TypeOfType *TP = dyn_cast<TypeOfType>(DT))
4148  QDT = TP->desugar();
4149  else if (const AttributedType *AT = dyn_cast<AttributedType>(DT))
4150  QDT = AT->desugar();
4151  if (QDT != castType &&
4153  if (Diagnose) {
4154  SourceLocation loc = (castRange.isValid() ? castRange.getBegin()
4155  : castExpr->getExprLoc());
4156  Diag(loc, diag::err_arc_nolifetime_behavior);
4157  }
4158  return ACR_error;
4159  }
4160  }
4161  return ACR_okay;
4162  }
4163 
4164  // The life-time qualifier cast check above is all we need for ObjCWeak.
4165  // ObjCAutoRefCount has more restrictions on what is legal.
4166  if (!getLangOpts().ObjCAutoRefCount)
4167  return ACR_okay;
4168 
4169  if (isAnyCLike(exprACTC) && isAnyCLike(castACTC)) return ACR_okay;
4170 
4171  // Allow all of these types to be cast to integer types (but not
4172  // vice-versa).
4173  if (castACTC == ACTC_none && castType->isIntegralType(Context))
4174  return ACR_okay;
4175 
4176  // Allow casts between pointers to lifetime types (e.g., __strong id*)
4177  // and pointers to void (e.g., cv void *). Casting from void* to lifetime*
4178  // must be explicit.
4179  if (exprACTC == ACTC_indirectRetainable && castACTC == ACTC_voidPtr)
4180  return ACR_okay;
4181  if (castACTC == ACTC_indirectRetainable && exprACTC == ACTC_voidPtr &&
4182  CCK != CCK_ImplicitConversion)
4183  return ACR_okay;
4184 
4185  switch (ARCCastChecker(Context, exprACTC, castACTC, false).Visit(castExpr)) {
4186  // For invalid casts, fall through.
4187  case ACC_invalid:
4188  break;
4189 
4190  // Do nothing for both bottom and +0.
4191  case ACC_bottom:
4192  case ACC_plusZero:
4193  return ACR_okay;
4194 
4195  // If the result is +1, consume it here.
4196  case ACC_plusOne:
4197  castExpr = ImplicitCastExpr::Create(Context, castExpr->getType(),
4198  CK_ARCConsumeObject, castExpr,
4199  nullptr, VK_RValue);
4200  Cleanup.setExprNeedsCleanups(true);
4201  return ACR_okay;
4202  }
4203 
4204  // If this is a non-implicit cast from id or block type to a
4205  // CoreFoundation type, delay complaining in case the cast is used
4206  // in an acceptable context.
4207  if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC) &&
4208  CCK != CCK_ImplicitConversion)
4209  return ACR_unbridged;
4210 
4211  // Issue a diagnostic about a missing @-sign when implicit casting a cstring
4212  // to 'NSString *', instead of falling through to report a "bridge cast"
4213  // diagnostic.
4214  if (castACTC == ACTC_retainable && exprACTC == ACTC_none &&
4215  ConversionToObjCStringLiteralCheck(castType, castExpr, Diagnose))
4216  return ACR_error;
4217 
4218  // Do not issue "bridge cast" diagnostic when implicit casting
4219  // a retainable object to a CF type parameter belonging to an audited
4220  // CF API function. Let caller issue a normal type mismatched diagnostic
4221  // instead.
4222  if ((!DiagnoseCFAudited || exprACTC != ACTC_retainable ||
4223  castACTC != ACTC_coreFoundation) &&
4224  !(exprACTC == ACTC_voidPtr && castACTC == ACTC_retainable &&
4225  (Opc == BO_NE || Opc == BO_EQ))) {
4226  if (Diagnose)
4227  diagnoseObjCARCConversion(*this, castRange, castType, castACTC, castExpr,
4228  castExpr, exprACTC, CCK);
4229  return ACR_error;
4230  }
4231  return ACR_okay;
4232 }
4233 
4234 /// Given that we saw an expression with the ARCUnbridgedCastTy
4235 /// placeholder type, complain bitterly.
4237  // We expect the spurious ImplicitCastExpr to already have been stripped.
4238  assert(!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast));
4239  CastExpr *realCast = cast<CastExpr>(e->IgnoreParens());
4240 
4241  SourceRange castRange;
4242  QualType castType;
4244 
4245  if (CStyleCastExpr *cast = dyn_cast<CStyleCastExpr>(realCast)) {
4246  castRange = SourceRange(cast->getLParenLoc(), cast->getRParenLoc());
4247  castType = cast->getTypeAsWritten();
4248  CCK = CCK_CStyleCast;
4249  } else if (ExplicitCastExpr *cast = dyn_cast<ExplicitCastExpr>(realCast)) {
4250  castRange = cast->getTypeInfoAsWritten()->getTypeLoc().getSourceRange();
4251  castType = cast->getTypeAsWritten();
4252  CCK = CCK_OtherCast;
4253  } else {
4254  llvm_unreachable("Unexpected ImplicitCastExpr");
4255  }
4256 
4257  ARCConversionTypeClass castACTC =
4259 
4260  Expr *castExpr = realCast->getSubExpr();
4261  assert(classifyTypeForARCConversion(castExpr->getType()) == ACTC_retainable);
4262 
4263  diagnoseObjCARCConversion(*this, castRange, castType, castACTC,
4264  castExpr, realCast, ACTC_retainable, CCK);
4265 }
4266 
4267 /// stripARCUnbridgedCast - Given an expression of ARCUnbridgedCast
4268 /// type, remove the placeholder cast.
4270  assert(e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast));
4271 
4272  if (ParenExpr *pe = dyn_cast<ParenExpr>(e)) {
4273  Expr *sub = stripARCUnbridgedCast(pe->getSubExpr());
4274  return new (Context) ParenExpr(pe->getLParen(), pe->getRParen(), sub);
4275  } else if (UnaryOperator *uo = dyn_cast<UnaryOperator>(e)) {
4276  assert(uo->getOpcode() == UO_Extension);
4277  Expr *sub = stripARCUnbridgedCast(uo->getSubExpr());
4278  return new (Context) UnaryOperator(sub, UO_Extension, sub->getType(),
4279  sub->getValueKind(), sub->getObjectKind(),
4280  uo->getOperatorLoc());
4281  } else if (GenericSelectionExpr *gse = dyn_cast<GenericSelectionExpr>(e)) {
4282  assert(!gse->isResultDependent());
4283 
4284  unsigned n = gse->getNumAssocs();
4285  SmallVector<Expr*, 4> subExprs(n);
4286  SmallVector<TypeSourceInfo*, 4> subTypes(n);
4287  for (unsigned i = 0; i != n; ++i) {
4288  subTypes[i] = gse->getAssocTypeSourceInfo(i);
4289  Expr *sub = gse->getAssocExpr(i);
4290  if (i == gse->getResultIndex())
4291  sub = stripARCUnbridgedCast(sub);
4292  subExprs[i] = sub;
4293  }
4294 
4295  return new (Context) GenericSelectionExpr(Context, gse->getGenericLoc(),
4296  gse->getControllingExpr(),
4297  subTypes, subExprs,
4298  gse->getDefaultLoc(),
4299  gse->getRParenLoc(),
4300  gse->containsUnexpandedParameterPack(),
4301  gse->getResultIndex());
4302  } else {
4303  assert(isa<ImplicitCastExpr>(e) && "bad form of unbridged cast!");
4304  return cast<ImplicitCastExpr>(e)->getSubExpr();
4305  }
4306 }
4307 
4309  QualType exprType) {
4310  QualType canCastType =
4311  Context.getCanonicalType(castType).getUnqualifiedType();
4312  QualType canExprType =
4313  Context.getCanonicalType(exprType).getUnqualifiedType();
4314  if (isa<ObjCObjectPointerType>(canCastType) &&
4315  castType.getObjCLifetime() == Qualifiers::OCL_Weak &&
4316  canExprType->isObjCObjectPointerType()) {
4317  if (const ObjCObjectPointerType *ObjT =
4318  canExprType->getAs<ObjCObjectPointerType>())
4319  if (const ObjCInterfaceDecl *ObjI = ObjT->getInterfaceDecl())
4320  return !ObjI->isArcWeakrefUnavailable();
4321  }
4322  return true;
4323 }
4324 
4325 /// Look for an ObjCReclaimReturnedObject cast and destroy it.
4327  Expr *curExpr = e, *prevExpr = nullptr;
4328 
4329  // Walk down the expression until we hit an implicit cast of kind
4330  // ARCReclaimReturnedObject or an Expr that is neither a Paren nor a Cast.
4331  while (true) {
4332  if (auto *pe = dyn_cast<ParenExpr>(curExpr)) {
4333  prevExpr = curExpr;
4334  curExpr = pe->getSubExpr();
4335  continue;
4336  }
4337 
4338  if (auto *ce = dyn_cast<CastExpr>(curExpr)) {
4339  if (auto *ice = dyn_cast<ImplicitCastExpr>(ce))
4340  if (ice->getCastKind() == CK_ARCReclaimReturnedObject) {
4341  if (!prevExpr)
4342  return ice->getSubExpr();
4343  if (auto *pe = dyn_cast<ParenExpr>(prevExpr))
4344  pe->setSubExpr(ice->getSubExpr());
4345  else
4346  cast<CastExpr>(prevExpr)->setSubExpr(ice->getSubExpr());
4347  return e;
4348  }
4349 
4350  prevExpr = curExpr;
4351  curExpr = ce->getSubExpr();
4352  continue;
4353  }
4354 
4355  // Break out of the loop if curExpr is neither a Paren nor a Cast.
4356  break;
4357  }
4358 
4359  return e;
4360 }
4361 
4364  SourceLocation BridgeKeywordLoc,
4365  TypeSourceInfo *TSInfo,
4366  Expr *SubExpr) {
4367  ExprResult SubResult = UsualUnaryConversions(SubExpr);
4368  if (SubResult.isInvalid()) return ExprError();
4369  SubExpr = SubResult.get();
4370 
4371  QualType T = TSInfo->getType();
4372  QualType FromType = SubExpr->getType();
4373 
4374  CastKind CK;
4375 
4376  bool MustConsume = false;
4377  if (T->isDependentType() || SubExpr->isTypeDependent()) {
4378  // Okay: we'll build a dependent expression type.
4379  CK = CK_Dependent;
4380  } else if (T->isObjCARCBridgableType() && FromType->isCARCBridgableType()) {
4381  // Casting CF -> id
4382  CK = (T->isBlockPointerType() ? CK_AnyPointerToBlockPointerCast
4383  : CK_CPointerToObjCPointerCast);
4384  switch (Kind) {
4385  case OBC_Bridge:
4386  break;
4387 
4388  case OBC_BridgeRetained: {
4389  bool br = isKnownName("CFBridgingRelease");
4390  Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4391  << 2
4392  << FromType
4393  << (T->isBlockPointerType()? 1 : 0)
4394  << T
4395  << SubExpr->getSourceRange()
4396  << Kind;
4397  Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4398  << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge");
4399  Diag(BridgeKeywordLoc, diag::note_arc_bridge_transfer)
4400  << FromType << br
4401  << FixItHint::CreateReplacement(BridgeKeywordLoc,
4402  br ? "CFBridgingRelease "
4403  : "__bridge_transfer ");
4404 
4405  Kind = OBC_Bridge;
4406  break;
4407  }
4408 
4409  case OBC_BridgeTransfer:
4410  // We must consume the Objective-C object produced by the cast.
4411  MustConsume = true;
4412  break;
4413  }
4414  } else if (T->isCARCBridgableType() && FromType->isObjCARCBridgableType()) {
4415  // Okay: id -> CF
4416  CK = CK_BitCast;
4417  switch (Kind) {
4418  case OBC_Bridge:
4419  // Reclaiming a value that's going to be __bridge-casted to CF
4420  // is very dangerous, so we don't do it.
4421  SubExpr = maybeUndoReclaimObject(SubExpr);
4422  break;
4423 
4424  case OBC_BridgeRetained:
4425  // Produce the object before casting it.
4426  SubExpr = ImplicitCastExpr::Create(Context, FromType,
4427  CK_ARCProduceObject,
4428  SubExpr, nullptr, VK_RValue);
4429  break;
4430 
4431  case OBC_BridgeTransfer: {
4432  bool br = isKnownName("CFBridgingRetain");
4433  Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4434  << (FromType->isBlockPointerType()? 1 : 0)
4435  << FromType
4436  << 2
4437  << T
4438  << SubExpr->getSourceRange()
4439  << Kind;
4440 
4441  Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4442  << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge ");
4443  Diag(BridgeKeywordLoc, diag::note_arc_bridge_retained)
4444  << T << br
4445  << FixItHint::CreateReplacement(BridgeKeywordLoc,
4446  br ? "CFBridgingRetain " : "__bridge_retained");
4447 
4448  Kind = OBC_Bridge;
4449  break;
4450  }
4451  }
4452  } else {
4453  Diag(LParenLoc, diag::err_arc_bridge_cast_incompatible)
4454  << FromType << T << Kind
4455  << SubExpr->getSourceRange()
4456  << TSInfo->getTypeLoc().getSourceRange();
4457  return ExprError();
4458  }
4459 
4460  Expr *Result = new (Context) ObjCBridgedCastExpr(LParenLoc, Kind, CK,
4461  BridgeKeywordLoc,
4462  TSInfo, SubExpr);
4463 
4464  if (MustConsume) {
4465  Cleanup.setExprNeedsCleanups(true);
4466  Result = ImplicitCastExpr::Create(Context, T, CK_ARCConsumeObject, Result,
4467  nullptr, VK_RValue);
4468  }
4469 
4470  return Result;
4471 }
4472 
4474  SourceLocation LParenLoc,
4476  SourceLocation BridgeKeywordLoc,
4477  ParsedType Type,
4478  SourceLocation RParenLoc,
4479  Expr *SubExpr) {
4480  TypeSourceInfo *TSInfo = nullptr;
4481  QualType T = GetTypeFromParser(Type, &TSInfo);
4482  if (Kind == OBC_Bridge)
4483  CheckTollFreeBridgeCast(T, SubExpr);
4484  if (!TSInfo)
4485  TSInfo = Context.getTrivialTypeSourceInfo(T, LParenLoc);
4486  return BuildObjCBridgedCast(LParenLoc, Kind, BridgeKeywordLoc, TSInfo,
4487  SubExpr);
4488 }
ObjCPropertyRefExpr - A dot-syntax expression to access an ObjC property.
Definition: ExprObjC.h:577
ObjCMethodDecl * LookupMethodInQualifiedType(Selector Sel, const ObjCObjectPointerType *OPT, bool IsInstance)
LookupMethodInQualifiedType - Lookups up a method in protocol qualifier list of a qualified objective...
const ObjCInterfaceType * getInterfaceType() const
If this pointer points to an Objective C @interface type, gets the type for that interface.
Definition: Type.cpp:1507
const internal::VariadicAllOfMatcher< Type > type
Matches Types in the clang AST.
Defines the clang::ASTContext interface.
ObjCMethodDecl * lookupPrivateClassMethod(const Selector &Sel)
Definition: DeclObjC.h:1881
bool hasDefinition() const
Determine whether this class has been defined.
Definition: DeclObjC.h:1554
QualType withConst() const
Retrieves a version of this type with const applied.
ObjCStringFormatFamily
QualType getObjCObjectType(QualType Base, ObjCProtocolDecl *const *Protocols, unsigned NumProtocols) const
Legacy interface: cannot provide type arguments or __kindof.
FunctionDecl - An instance of this class is created to represent a function declaration or definition...
Definition: Decl.h:1698
Stmt * body_back()
Definition: Stmt.h:628
Name lookup found a set of overloaded functions that met the criteria.
Definition: Lookup.h:49
static DiagnosticBuilder Diag(DiagnosticsEngine *Diags, const LangOptions &Features, FullSourceLoc TokLoc, const char *TokBegin, const char *TokRangeBegin, const char *TokRangeEnd, unsigned DiagID)
Produce a diagnostic highlighting some portion of a literal.
bool isSelfExpr(Expr *RExpr)
Private Helper predicate to check for &#39;self&#39;.
SourceLocation getLocWithOffset(int Offset) const
Return a source location with the specified offset from this SourceLocation.
static ObjCArrayLiteral * Create(const ASTContext &C, ArrayRef< Expr *> Elements, QualType T, ObjCMethodDecl *Method, SourceRange SR)
Definition: ExprObjC.cpp:45
Smart pointer class that efficiently represents Objective-C method names.
QualType getObjCIdType() const
Represents the Objective-CC id type.
Definition: ASTContext.h:1800
static void checkFoundationAPI(Sema &S, SourceLocation Loc, const ObjCMethodDecl *Method, ArrayRef< Expr *> Args, QualType ReceiverType, bool IsClassObjectCall)
if(T->getSizeExpr()) TRY_TO(TraverseStmt(T -> getSizeExpr()))
PointerType - C99 6.7.5.1 - Pointer Declarators.
Definition: Type.h:2285
QualType getPointeeType() const
Definition: Type.h:2298
CanQualType VoidPtrTy
Definition: ASTContext.h:1012
A (possibly-)qualified type.
Definition: Type.h:653
bool isBlockPointerType() const
Definition: Type.h:5952
QualType substObjCTypeArgs(ASTContext &ctx, ArrayRef< QualType > typeArgs, ObjCSubstitutionContext context) const
Substitute type arguments for the Objective-C type parameters used in the subject type...
Definition: Type.cpp:1115
Simple class containing the result of Sema::CorrectTypo.
unsigned param_size() const
Definition: DeclObjC.h:379
Selector getSelector() const
Definition: ExprObjC.cpp:312
ObjCInterfaceDecl * getClassInterface()
Definition: DeclObjC.cpp:1101
ExprResult ActOnSuperMessage(Scope *S, SourceLocation SuperLoc, Selector Sel, SourceLocation LBracLoc, ArrayRef< SourceLocation > SelectorLocs, SourceLocation RBracLoc, MultiExprArg Args)
A cast other than a C-style cast.
Definition: Sema.h:9228
void* might be a normal C type, or it might a CF type.
void AddFixItHint(const FixItHint &Hint) const
Definition: Diagnostic.h:1082
QualType getDesugaredType(const ASTContext &Context) const
Return the specified type with any "sugar" removed from the type.
Definition: Type.h:946
ObjCBridgeCastKind
The kind of bridging performed by the Objective-C bridge cast.
Ordinary name lookup, which finds ordinary names (functions, variables, typedefs, etc...
Definition: Sema.h:2994
CompoundStmt * getSubStmt()
Definition: Expr.h:3504
CanQualType Char32Ty
Definition: ASTContext.h:1003
bool LookupName(LookupResult &R, Scope *S, bool AllowBuiltinCreation=false)
Perform unqualified name lookup starting from a given scope.
ObjCMessageKind
Describes the kind of message expression indicated by a message send that starts with an identifier...
Definition: Sema.h:8093
Stmt - This represents one statement.
Definition: Stmt.h:66
NullabilityKind
Describes the nullability of a particular type.
Definition: Specifiers.h:282
static void diagnoseObjCARCConversion(Sema &S, SourceRange castRange, QualType castType, ARCConversionTypeClass castACTC, Expr *castExpr, Expr *realCast, ARCConversionTypeClass exprACTC, Sema::CheckedConversionKind CCK)
bool isObjCClassOrClassKindOfType() const
Whether the type is Objective-C &#39;Class&#39; or a __kindof type of an Class type, e.g., __kindof Class <NSCopying>.
Definition: Type.cpp:537
ARCConversionResult CheckObjCConversion(SourceRange castRange, QualType castType, Expr *&op, CheckedConversionKind CCK, bool Diagnose=true, bool DiagnoseCFAudited=false, BinaryOperatorKind Opc=BO_PtrMemD)
Checks for invalid conversions and casts between retainable pointers and other pointer kinds for ARC ...
Bridging via __bridge, which does nothing but reinterpret the bits.
QualType getPointeeType() const
If this is a pointer, ObjC object pointer, or block pointer, this returns the respective pointee...
Definition: Type.cpp:456
ObjCMethodDecl * LookupMethodInObjectType(Selector Sel, QualType Ty, bool IsInstance)
LookupMethodInType - Look up a method in an ObjCObjectType.
bool hasPlaceholderType() const
Returns whether this expression has a placeholder type.
Definition: Expr.h:472
static bool CheckObjCBridgeNSCast(Sema &S, QualType castType, Expr *castExpr, bool &HadTheAttribute, bool warn)
void addConst()
Add the const type qualifier to this QualType.
Definition: Type.h:815
bool isObjCARCBridgableType() const
Determine whether the given type T is a "bridgable" Objective-C type, which is either an Objective-C ...
Definition: Type.cpp:3853
bool isRecordType() const
Definition: Type.h:6017
bool isAscii() const
Definition: Expr.h:1600
static InitializedEntity InitializeParameter(ASTContext &Context, const ParmVarDecl *Parm)
Create the initialization entity for a parameter.
const ObjCObjectType * getAsObjCInterfaceType() const
Definition: Type.cpp:1559
SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID)
Emit a diagnostic.
Definition: Sema.h:1270
Decl - This represents one declaration (or definition), e.g.
Definition: DeclBase.h:86
static bool HelperToDiagnoseMismatchedMethodsInGlobalPool(Sema &S, SourceLocation AtLoc, SourceLocation LParenLoc, SourceLocation RParenLoc, ObjCMethodDecl *Method, ObjCMethodList &MethList)
bool isExtVectorType() const
Definition: Type.h:6033
StringRef P
Scope * TUScope
Translation Unit Scope - useful to Objective-C actions that need to lookup file scope declarations in...
Definition: Sema.h:805
ParenExpr - This represents a parethesized expression, e.g.
Definition: Expr.h:1665
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:5893
const char * getCharacterData(SourceLocation SL, bool *Invalid=nullptr) const
Return a pointer to the start of the specified location in the appropriate spelling MemoryBuffer...
The base class of the type hierarchy.
Definition: Type.h:1353
CanQual< T > getUnqualifiedType() const
Retrieve the unqualified form of this type.
static void RemoveSelectorFromWarningCache(Sema &S, Expr *Arg)
Represents an array type, per C99 6.7.5.2 - Array Declarators.
Definition: Type.h:2560
SourceLocation getLocForEndOfToken(SourceLocation Loc, unsigned Offset=0)
Calls Lexer::getLocForEndOfToken()
Definition: Sema.cpp:45
ExprResult ActOnObjCBridgedCast(Scope *S, SourceLocation LParenLoc, ObjCBridgeCastKind Kind, SourceLocation BridgeKeywordLoc, ParsedType Type, SourceLocation RParenLoc, Expr *SubExpr)
static FixItHint CreateInsertionFromRange(SourceLocation InsertionLoc, CharSourceRange FromRange, bool BeforePreviousInsertions=false)
Create a code modification hint that inserts the given code from FromRange at a specific location...
Definition: Diagnostic.h:103
ObjCSubscriptRefExpr - used for array and dictionary subscripting.
Definition: ExprObjC.h:802
const ObjCObjectPointerType * getAsObjCInterfacePointerType() const
Definition: Type.cpp:1567
static ExprValueKind getValueKindForType(QualType T)
getValueKindForType - Given a formal return or parameter type, give its value kind.
Definition: Expr.h:395
QualType withConst() const
Definition: Type.h:818
A container of type source information.
Definition: Decl.h:86
bool isCARCBridgableType() const
Determine whether the given type T is a "bridgeable" C type.
Definition: Type.cpp:3858
SourceLocation getLocStart() const LLVM_READONLY
Definition: Expr.h:1645
static StringLiteral * Create(const ASTContext &C, StringRef Str, StringKind Kind, bool Pascal, QualType Ty, const SourceLocation *Loc, unsigned NumStrs)
This is the "fully general" constructor that allows representation of strings formed from multiple co...
Definition: Expr.cpp:854
ObjCMethodDecl * getMethod() const
void setDelegateInitCall(bool isDelegate)
Definition: ExprObjC.h:1360
QualType getElementType() const
Definition: Type.h:2595
static InitializedEntity InitializeTemporary(QualType Type)
Create the initialization entity for a temporary.
Retains information about a function, method, or block that is currently being parsed.
Definition: ScopeInfo.h:82
An Objective-C array/dictionary subscripting which reads an object or writes at the subscripted array...
Definition: Specifiers.h:138
VarDecl - An instance of this class is created to represent a variable declaration or definition...
Definition: Decl.h:807
QualType getReturnType() const
Definition: Decl.h:2205
DiagnosticsEngine & Diags
Definition: Sema.h:318
ObjCMethodDecl * tryCaptureObjCSelf(SourceLocation Loc)
Try to capture an implicit reference to &#39;self&#39;.
const T * getAs() const
Member-template getAs<specific type>&#39;.
Definition: Type.h:6307
bool isInObjcMethodScope() const
isInObjcMethodScope - Return true if this scope is, or is contained in, an Objective-C method body...
Definition: Scope.h:348
SourceLocation getLocStart() const LLVM_READONLY
Definition: DeclObjC.h:321
ObjCMethodDecl - Represents an instance or class method declaration.
Definition: DeclObjC.h:139
DeclClass * getCorrectionDeclAs() const
bool isInvalidDecl() const
Definition: DeclBase.h:546
static ObjCPropertyDecl * findPropertyDecl(const DeclContext *DC, const IdentifierInfo *propertyID, ObjCPropertyQueryKind queryKind)
Lookup a property by name in the specified DeclContext.
Definition: DeclObjC.cpp:170
static const ObjCMethodDecl * findExplicitInstancetypeDeclarer(const ObjCMethodDecl *MD, QualType instancetype)
Look for an ObjC method whose result type exactly matches the given type.
llvm::MapVector< Selector, SourceLocation > ReferencedSelectors
Method selectors used in a @selector expression.
Definition: Sema.h:1126
static StringRef bytes(const std::vector< T, Allocator > &v)
Definition: ASTWriter.cpp:119
ParmVarDecl - Represents a parameter to a function.
Definition: Decl.h:1514
ObjCPropertyDecl * getExplicitProperty() const
Definition: ExprObjC.h:670
IdentifierInfo * getIdentifier() const
getIdentifier - Get the identifier that names this declaration, if there is one.
Definition: Decl.h:265
Expr * IgnoreImpCasts() LLVM_READONLY
IgnoreImpCasts - Skip past any implicit casts which might surround this expression.
Definition: Expr.h:2865
RecordDecl - Represents a struct/union/class.
Definition: Decl.h:3482
DeclarationName getDeclName() const
getDeclName - Get the actual, stored name of the declaration, which may be a special name...
Definition: Decl.h:291
Selector getUnarySelector(IdentifierInfo *ID)
One of these records is kept for each identifier that is lexed.
std::unique_ptr< NSAPI > NSAPIObj
Caches identifiers/selectors for NSFoundation APIs.
Definition: Sema.h:833
bool isObjCIdOrObjectKindOfType(const ASTContext &ctx, const ObjCObjectType *&bound) const
Whether the type is Objective-C &#39;id&#39; or a __kindof type of an object type, e.g., __kindof NSView * or...
Definition: Type.cpp:511
Name lookup results in an ambiguity; use getAmbiguityKind to figure out what kind of ambiguity we hav...
Definition: Lookup.h:59
Expr * getFalseExpr() const
Definition: Expr.h:3312
An element in an Objective-C dictionary literal.
Definition: ExprObjC.h:239
bool isStr(const char(&Str)[StrLen]) const
Return true if this is the identifier for the specified string.
Represents a class type in Objective C.
Definition: Type.h:5186
edit_iterator edit_end() const
Definition: Commit.h:111
ObjCMethodDecl * lookupInstanceMethod(Selector Sel) const
Lookup an instance method for a given selector.
Definition: DeclObjC.h:1866
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:149
void setObjCConstantStringInterface(ObjCInterfaceDecl *Decl)
A C-style cast.
Definition: Sema.h:9224
ObjCMethodFamily
A family of Objective-C methods.
Base class for callback objects used by Sema::CorrectTypo to check the validity of a potential typo c...
bool isExplicitProperty() const
Definition: ExprObjC.h:668
bool isObjCIdType() const
Definition: Type.h:6070
void diagnoseARCUnbridgedCast(Expr *e)
Given that we saw an expression with the ARCUnbridgedCastTy placeholder type, complain bitterly...
static ObjCMessageExpr * Create(const ASTContext &Context, QualType T, ExprValueKind VK, SourceLocation LBracLoc, SourceLocation SuperLoc, bool IsInstanceSuper, QualType SuperType, Selector Sel, ArrayRef< SourceLocation > SelLocs, ObjCMethodDecl *Method, ArrayRef< Expr *> Args, SourceLocation RBracLoc, bool isImplicit)
Create a message send to super.
Definition: ExprObjC.cpp:207
const DeclarationNameInfo & getLookupNameInfo() const
Gets the name info to look up.
Definition: Lookup.h:245
const ObjCObjectPointerType * getAsObjCQualifiedIdType() const
Definition: Type.cpp:1539
bool CheckObjCBridgeRelatedConversions(SourceLocation Loc, QualType DestType, QualType SrcType, Expr *&SrcExpr, bool Diagnose=true)
ExprResult BuildClassMessageImplicit(QualType ReceiverType, bool isSuperReceiver, SourceLocation Loc, Selector Sel, ObjCMethodDecl *Method, MultiExprArg Args)
ExprResult ActOnObjCBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind)
ActOnObjCBoolLiteral - Parse {__objc_yes,__objc_no} literals.
Definition: SemaExpr.cpp:16047
LookupResultKind getResultKind() const
Definition: Lookup.h:324
static ObjCBridgeRelatedAttr * ObjCBridgeRelatedAttrFromType(QualType T, TypedefNameDecl *&TDNDecl)
Expr * getSubExpr()
Definition: Expr.h:2761
bool isObjCQualifiedClassType() const
Definition: Type.h:6064
void CheckObjCBridgeRelatedCast(QualType castType, Expr *castExpr)
No entity found met the criteria within the current instantiation,, but there were dependent base cla...
Definition: Lookup.h:41
IdentifierTable & Idents
Definition: ASTContext.h:537
bool ObjCObjectAdoptsQTypeProtocols(QualType QT, ObjCInterfaceDecl *Decl)
ObjCObjectAdoptsQTypeProtocols - Checks that protocols in IC&#39;s protocol list adopt all protocols in Q...
An r-value expression (a pr-value in the C++11 taxonomy) produces a temporary value.
Definition: Specifiers.h:107
Values of this type can be null.
bool isUnarySelector() const
ObjCMethodFamily getMethodFamily() const
Determines the family of this method.
Definition: DeclObjC.cpp:943
static Selector constructSetterSelector(IdentifierTable &Idents, SelectorTable &SelTable, const IdentifierInfo *Name)
Return the default setter selector for the given identifier.
bool followsCreateRule(const FunctionDecl *FD)
BinaryOperatorKind
Selector getNullarySelector(IdentifierInfo *ID)
Represents the results of name lookup.
Definition: Lookup.h:32
PtrTy get() const
Definition: Ownership.h:162
static ObjCInterfaceDecl * Create(const ASTContext &C, DeclContext *DC, SourceLocation atLoc, IdentifierInfo *Id, ObjCTypeParamList *typeParamList, ObjCInterfaceDecl *PrevDecl, SourceLocation ClassLoc=SourceLocation(), bool isInternal=false)
Definition: DeclObjC.cpp:1417
ObjCContainerDecl - Represents a container for method declarations.
Definition: DeclObjC.h:986
ObjCMethodDecl * getCurMethodDecl()
getCurMethodDecl - If inside of a method body, this returns a pointer to the method decl for the meth...
Definition: Sema.cpp:1171
ExprResult BuildObjCNumericLiteral(SourceLocation AtLoc, Expr *Number)
BuildObjCNumericLiteral - builds an ObjCBoxedExpr AST node for the numeric literal expression...
const ArrayType * getAsArrayTypeUnsafe() const
A variant of getAs<> for array types which silently discards qualifiers from the outermost type...
Definition: Type.h:6356
static void applyCocoaAPICheck(Sema &S, const ObjCMessageExpr *Msg, unsigned DiagID, bool(*refactor)(const ObjCMessageExpr *, const NSAPI &, edit::Commit &))
Whether values of this type can be null is (explicitly) unspecified.
QualType getObjCNSStringType() const
Definition: ASTContext.h:1577
const ObjCObjectPointerType * getAsObjCQualifiedClassType() const
Definition: Type.cpp:1549
GlobalMethodPool MethodPool
Method Pool - allows efficient lookup when typechecking messages to "id".
Definition: Sema.h:1122
TypeDecl - Represents a declaration of a type.
Definition: Decl.h:2754
A builtin binary operation expression such as "x + y" or "x <= y".
Definition: Expr.h:2985
CanQualType PseudoObjectTy
Definition: ASTContext.h:1015
tokloc_iterator tokloc_end() const
Definition: Expr.h:1643
std::string getAsString() const
Definition: Type.h:979
CheckedConversionKind
The kind of conversion being performed.
Definition: Sema.h:9220
Expr * IgnoreParenCasts() LLVM_READONLY
IgnoreParenCasts - Ignore parentheses and casts.
Definition: Expr.cpp:2463
ObjCStringLiteral, used for Objective-C string literals i.e.
Definition: ExprObjC.h:51
Values of this type can never be null.
ObjCProtocolDecl * getDefinition()
Retrieve the definition of this protocol, if any.
Definition: DeclObjC.h:2229
Scope - A scope is a transient data structure that is used while parsing the program.
Definition: Scope.h:39
const Type * getTypePtr() const
Retrieves a pointer to the underlying (unqualified) type.
Definition: Type.h:5720
void getOverriddenMethods(SmallVectorImpl< const ObjCMethodDecl *> &Overridden) const
Return overridden methods for the given Method.
Definition: DeclObjC.cpp:1244
ObjCMethodDecl * lookupClassMethod(Selector Sel) const
Lookup a class method for a given selector.
Definition: DeclObjC.h:1871
void CheckTollFreeBridgeCast(QualType castType, Expr *castExpr)
CastExpr - Base class for type casts, including both implicit casts (ImplicitCastExpr) and explicit c...
Definition: Expr.h:2710
Represents an Objective-C protocol declaration.
Definition: DeclObjC.h:2083
const internal::VariadicDynCastAllOfMatcher< Stmt, CastExpr > castExpr
Matches any cast nodes of Clang&#39;s AST.
ObjCInterfaceDecl * NSNumberDecl
The declaration of the Objective-C NSNumber class.
Definition: Sema.h:836
const LangOptions & getLangOpts() const
Definition: Sema.h:1193
ExprResult BuildObjCDictionaryLiteral(SourceRange SR, MutableArrayRef< ObjCDictionaryElement > Elements)
bool isTypeDependent() const
isTypeDependent - Determines whether this expression is type-dependent (C++ [temp.dep.expr]), which means that its type could change from one template instantiation to the next.
Definition: Expr.h:167
Represents an ObjC class declaration.
Definition: DeclObjC.h:1191
Bridging via __bridge_transfer, which transfers ownership of an Objective-C pointer into ARC...
QualType getReturnType() const
Definition: DeclObjC.h:361
ObjCInterfaceDecl * getInterface() const
Gets the interface declaration for this object type, if the base type really is an interface...
Definition: Type.h:5421
SourceLocation OrigLoc
Definition: Commit.h:36
QualType getObjCProtoType() const
Retrieve the type of the Objective-C Protocol class.
Definition: ASTContext.h:1846
void setMethodParams(ASTContext &C, ArrayRef< ParmVarDecl *> Params, ArrayRef< SourceLocation > SelLocs=llvm::None)
Sets the method&#39;s parameters and selector source locations.
Definition: DeclObjC.cpp:841
const LangOptions & LangOpts
Definition: Sema.h:314
bool isKnownName(StringRef name)
ObjCMethodDecl * getCategoryClassMethod(Selector Sel) const
Definition: DeclObjC.cpp:1654
static bool isAnyRetainable(ARCConversionTypeClass ACTC)
bool hasAttr() const
Definition: DeclBase.h:535
ConditionalOperator - The ?: ternary operator.
Definition: Expr.h:3269
Sema - This implements semantic analysis and AST building for C.
Definition: Sema.h:274
RecordDecl * getMostRecentDecl()
Definition: Decl.h:3528
StringRef getString() const
Definition: Expr.h:1557
CharSourceRange getFileRange(SourceManager &SM) const
Definition: Commit.cpp:26
void EmitRelatedResultTypeNoteForReturn(QualType destType)
Given that we had incompatible pointer types in a return statement, check whether we&#39;re in a method w...
A little helper class used to produce diagnostics.
Definition: Diagnostic.h:955
A functional-style cast.
Definition: Sema.h:9226
int, void, struct A
SourceLocation getLocStart() const LLVM_READONLY
Definition: Decl.h:2781
const ObjCObjectType * getSuperClassType() const
Retrieve the superclass type.
Definition: DeclObjC.h:1584
ExprResult BuildObjCBridgedCast(SourceLocation LParenLoc, ObjCBridgeCastKind Kind, SourceLocation BridgeKeywordLoc, TypeSourceInfo *TSInfo, Expr *SubExpr)
CastKind
CastKind - The kind of operation required for a conversion.
static bool validateBoxingMethod(Sema &S, SourceLocation Loc, const ObjCInterfaceDecl *Class, Selector Sel, const ObjCMethodDecl *Method)
Emits an error if the given method does not exist, or if the return type is not an Objective-C object...
qual_range quals() const
Definition: Type.h:5086
static ObjCInterfaceDecl * LookupObjCInterfaceDeclForLiteral(Sema &S, SourceLocation Loc, Sema::ObjCLiteralKind LiteralKind)
Looks up ObjCInterfaceDecl of a given NSClassIdKindKind.
static ImplicitCastExpr * Create(const ASTContext &Context, QualType T, CastKind Kind, Expr *Operand, const CXXCastPath *BasePath, ExprValueKind Cat)
Definition: Expr.cpp:1718
SourceLocation getLocEnd() const LLVM_READONLY
Definition: Stmt.cpp:290
bool CheckMessageArgumentTypes(QualType ReceiverType, MultiExprArg Args, Selector Sel, ArrayRef< SourceLocation > SelectorLocs, ObjCMethodDecl *Method, bool isClassMessage, bool isSuperMessage, SourceLocation lbrac, SourceLocation rbrac, SourceRange RecRange, QualType &ReturnType, ExprValueKind &VK)
CheckMessageArgumentTypes - Check types in an Obj-C message send.
NSClassIdKindKind
Definition: NSAPI.h:30
TypeSourceInfo * getTrivialTypeSourceInfo(QualType T, SourceLocation Loc=SourceLocation()) const
Allocate a TypeSourceInfo where all locations have been initialized to a given location, which defaults to the empty location.
bool hasDefinition() const
Determine whether this protocol has a definition.
Definition: DeclObjC.h:2217
An Objective-C property is a logical field of an Objective-C object which is read and written via Obj...
Definition: Specifiers.h:133
ObjCStringFormatFamily getStringFormatFamily() const
Expr - This represents one expression.
Definition: Expr.h:106
ObjCMethodList * getNext() const
static ObjCMethodDecl * Create(ASTContext &C, SourceLocation beginLoc, SourceLocation endLoc, Selector SelInfo, QualType T, TypeSourceInfo *ReturnTInfo, DeclContext *contextDecl, bool isInstance=true, bool isVariadic=false, bool isPropertyAccessor=false, bool isImplicitlyDeclared=false, bool isDefined=false, ImplementationControl impControl=None, bool HasRelatedResultType=false)
Definition: DeclObjC.cpp:772
ExprValueKind
The categorization of expression values, currently following the C++11 scheme.
Definition: Specifiers.h:104
Expr * stripARCUnbridgedCast(Expr *e)
stripARCUnbridgedCast - Given an expression of ARCUnbridgedCast type, remove the placeholder cast...
bool checkObjCBridgeRelatedComponents(SourceLocation Loc, QualType DestType, QualType SrcType, ObjCInterfaceDecl *&RelatedClass, ObjCMethodDecl *&ClassMethod, ObjCMethodDecl *&InstanceMethod, TypedefNameDecl *&TDNDecl, bool CfToNs, bool Diagnose=true)
bool isInSystemHeader(SourceLocation Loc) const
Returns if a SourceLocation is in a system header.
static Kind getNullabilityAttrKind(NullabilityKind kind)
Retrieve the attribute kind corresponding to the given nullability kind.
Definition: Type.h:4136
const FunctionProtoType * T
const T * castAs() const
Member-template castAs<specific type>.
Definition: Type.h:6370
static bool isAnyCLike(ARCConversionTypeClass ACTC)
bool isObjCRetainableType() const
Definition: Type.cpp:3824
static ARCConversionTypeClass classifyTypeForARCConversion(QualType type)
static QualType stripObjCInstanceType(ASTContext &Context, QualType T)
bool hasRelatedResultType() const
Determine whether this method has a result type that is related to the message receiver&#39;s type...
Definition: DeclObjC.h:306
Defines the clang::Preprocessor interface.
bool isObjCClassType() const
Definition: Type.h:6076
DeclContext * getDeclContext()
Definition: DeclBase.h:425
edit_iterator edit_begin() const
Definition: Commit.h:110
ObjCInterfaceDecl * getSuperClass() const
Definition: DeclObjC.cpp:330
ObjCSelectorExpr used for @selector in Objective-C.
Definition: ExprObjC.h:429
ExprResult CheckPlaceholderExpr(Expr *E)
Check for operands with placeholder types and complain if found.
Definition: SemaExpr.cpp:15934
static ObjCDictionaryLiteral * Create(const ASTContext &C, ArrayRef< ObjCDictionaryElement > VK, bool HasPackExpansions, QualType T, ObjCMethodDecl *method, SourceRange SR)
Definition: ExprObjC.cpp:95
QualType NSNumberPointer
Pointer to NSNumber type (NSNumber *).
Definition: Sema.h:842
Defines the clang::TypeLoc interface and its subclasses.
IdentifierInfo * getAsIdentifierInfo() const
getAsIdentifierInfo - Retrieve the IdentifierInfo * stored in this declaration name, or NULL if this declaration name isn&#39;t a simple identifier.
Specifies that a value-dependent expression of integral or dependent type should be considered a null...
Definition: Expr.h:702
bool isInvalid() const
QualType getType() const
Definition: Expr.h:128
static Optional< NullabilityKind > stripOuterNullability(QualType &T)
Strip off the top-level nullability annotation on the given type, if it&#39;s there.
Definition: Type.cpp:3735
DefinitionKind hasDefinition(ASTContext &) const
Check whether this variable is defined in this translation unit.
Definition: Decl.cpp:2088
ObjCIvarDecl * lookupInstanceVariable(IdentifierInfo *IVarName, ObjCInterfaceDecl *&ClassDeclared)
Definition: DeclObjC.cpp:613
bool isIdentifier() const
Predicate functions for querying what type of name this is.
ObjCMessageKind getObjCMessageKind(Scope *S, IdentifierInfo *Name, SourceLocation NameLoc, bool IsSuper, bool HasTrailingDot, ParsedType &ReceiverType)
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...
An expression that sends a message to the given Objective-C object or class.
Definition: ExprObjC.h:903
ObjCMethodDecl * getImplicitPropertyGetter() const
Definition: ExprObjC.h:675
bool isInvalid() const
Definition: Ownership.h:158
QualType getObjCInterfaceType(const ObjCInterfaceDecl *Decl, ObjCInterfaceDecl *PrevDecl=nullptr) const
getObjCInterfaceType - Return the unique reference to the type for the specified ObjC interface decl...
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:1717
bool isInstanceMethod() const
Definition: DeclObjC.h:452
ArraySizeModifier getSizeModifier() const
Definition: Type.h:2597
bool rewriteObjCRedundantCallWithLiteral(const ObjCMessageExpr *Msg, const NSAPI &NS, Commit &commit)
unsigned getNumArgs() const
ValueDecl * getDecl()
Definition: Expr.h:1041
bool isUsable() const
Definition: Ownership.h:159
Selector getSelector() const
Definition: DeclObjC.h:359
bool CheckTollFreeBridgeStaticCast(QualType castType, Expr *castExpr, CastKind &Kind)
QualType getTypeDeclType(const TypeDecl *Decl, const TypeDecl *PrevDecl=nullptr) const
Return the unique reference to the type for the specified type declaration.
Definition: ASTContext.h:1347
NamedDecl * LookupSingleName(Scope *S, DeclarationName Name, SourceLocation Loc, LookupNameKind NameKind, RedeclarationKind Redecl=NotForRedeclaration)
Look up a name, looking for a single declaration.
bool isUnionType() const
Definition: Type.cpp:432
CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style cast in C++ (C++ [expr.cast]), which uses the syntax (Type)expr.
Definition: Expr.h:2922
bool isNull() const
Return true if this QualType doesn&#39;t point to a type yet.
Definition: Type.h:719
ImplicitParamDecl * getSelfDecl() const
Definition: DeclObjC.h:444
const SourceManager & SM
Definition: Format.cpp:1337
static InitializationKind CreateCopy(SourceLocation InitLoc, SourceLocation EqualLoc, bool AllowExplicitConvs=false)
Create a copy initialization.
bool isConstQualified() const
Determine whether this type is const-qualified.
Definition: Type.h:5779
ExprResult ParseObjCProtocolExpression(IdentifierInfo *ProtocolName, SourceLocation AtLoc, SourceLocation ProtoLoc, SourceLocation LParenLoc, SourceLocation ProtoIdLoc, SourceLocation RParenLoc)
ParseObjCProtocolExpression - Build protocol expression for @protocol.
SourceLocation getLocStart() const LLVM_READONLY
Definition: DeclBase.h:408
QualType getWideCharType() const
Return the type of wide characters.
Definition: ASTContext.h:1516
There is no lifetime qualification on this type.
Definition: Type.h:169
static bool isMethodDeclaredInRootProtocol(Sema &S, const ObjCMethodDecl *M)
std::string getAsString() const
Derive the full selector name (e.g.
ARCConversionResult
Definition: Sema.h:9644
SelectorTable & Selectors
Definition: ASTContext.h:538
Kind
bool QIdProtocolsAdoptObjCObjectProtocols(QualType QT, ObjCInterfaceDecl *IDecl)
QIdProtocolsAdoptObjCObjectProtocols - Checks that protocols in QT&#39;s qualified-id protocol list adopt...
ActionResult - This structure is used while parsing/acting on expressions, stmts, etc...
Definition: Ownership.h:144
PseudoObjectExpr - An expression which accesses a pseudo-object l-value.
Definition: Expr.h:4969
ObjCMethodFamily getMethodFamily() const
Derive the conventional family of this method.
NullPointerConstantKind isNullPointerConstant(ASTContext &Ctx, NullPointerConstantValueDependence NPC) const
isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to a Null pointer constant...
Definition: Expr.cpp:3273
Encodes a location in the source.
ObjCInterfaceDecl * getDecl() const
Get the declaration of this interface.
Definition: Type.h:5399
Sugar for parentheses used when specifying types.
Definition: Type.h:2255
IdentifierInfo & get(StringRef Name)
Return the identifier token info for the specified named identifier.
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of enums...
Definition: Type.h:4004
Expr * getSubExpr() const
Definition: Expr.h:1744
Represents typeof(type), a GCC extension.
Definition: Type.h:3827
Interfaces are the core concept in Objective-C for object oriented design.
Definition: Type.h:5386
CastKind getCastKind() const
Definition: Expr.h:2757
std::string getNameAsString() const
getNameAsString - Get a human-readable name for the declaration, even if it is one of the special kin...
Definition: Decl.h:285
ObjCMethodFamily getMethodFamily() const
Definition: ExprObjC.h:1321
ExprResult ActOnClassMessage(Scope *S, ParsedType Receiver, Selector Sel, SourceLocation LBracLoc, ArrayRef< SourceLocation > SelectorLocs, SourceLocation RBracLoc, MultiExprArg Args)
ARCConversionTypeClass
bool makeUnavailableInSystemHeader(SourceLocation loc, UnavailableAttr::ImplicitReason reason)
makeUnavailableInSystemHeader - There is an error in the current context.
Definition: Sema.cpp:369
QualType getObjCSelType() const
Retrieve the type that corresponds to the predefined Objective-C &#39;SEL&#39; type.
Definition: ASTContext.h:1810
bool ObjCWarnForNoDesignatedInitChain
This starts true for a method marked as designated initializer and will be set to false if there is a...
Definition: ScopeInfo.h:129
SmallVectorImpl< Edit >::const_iterator edit_iterator
Definition: Commit.h:109
bool isIntegralType(const ASTContext &Ctx) const
Determine whether this type is an integral type.
Definition: Type.cpp:1722
const ConstantArrayType * getAsConstantArrayType(QualType T) const
Definition: ASTContext.h:2321
StmtVisitor - This class implements a simple visitor for Stmt subclasses.
Definition: StmtVisitor.h:183
ExprResult BuildObjCArrayLiteral(SourceRange SR, MultiExprArg Elements)
ExprResult DefaultLvalueConversion(Expr *E)
Definition: SemaExpr.cpp:530
bool CheckObjCARCUnavailableWeakConversion(QualType castType, QualType ExprType)
bool isLiteral(TokenKind K)
Return true if this is a "literal" kind, like a numeric constant, string, etc.
Definition: TokenKinds.h:87
Name lookup found an unresolvable value declaration and cannot yet complete.
Definition: Lookup.h:54
Specifies that a value-dependent expression should be considered to never be a null pointer constant...
Definition: Expr.h:706
ObjCProtocolExpr used for protocol expression in Objective-C.
Definition: ExprObjC.h:474
Describes the kind of initialization being performed, along with location information for tokens rela...
ExprResult ActOnClassPropertyRefExpr(IdentifierInfo &receiverName, IdentifierInfo &propertyName, SourceLocation receiverNameLoc, SourceLocation propertyNameLoc)
bool isObjCObjectPointerType() const
Definition: Type.h:6041
static ExprResult CheckObjCCollectionLiteralElement(Sema &S, Expr *Element, QualType T, bool ArrayLiteral=false)
Check that the given expression is a valid element of an Objective-C collection literal.
bool FormatStringHasSArg(const StringLiteral *FExpr)
Represents one property declaration in an Objective-C interface.
Definition: DeclObjC.h:746
ExprResult BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo, QualType ReceiverType, SourceLocation SuperLoc, Selector Sel, ObjCMethodDecl *Method, SourceLocation LBracLoc, ArrayRef< SourceLocation > SelectorLocs, SourceLocation RBracLoc, MultiExprArg Args, bool isImplicit=false)
Build an Objective-C class message expression.
bool isSuperClassOf(const ObjCInterfaceDecl *I) const
isSuperClassOf - Return true if this class is the specified class or is a super class of the specifie...
Definition: DeclObjC.h:1829
No entity found met the criteria.
Definition: Lookup.h:36
QualType getAttributedType(AttributedType::Kind attrKind, QualType modifiedType, QualType equivalentType)
bool ObjCIsDesignatedInit
True when this is a method marked as a designated initializer.
Definition: ScopeInfo.h:125
static QualType getBaseMessageSendResultType(Sema &S, QualType ReceiverType, ObjCMethodDecl *Method, bool isClassMessage, bool isSuperMessage)
Determine the result type of a message send based on the receiver type, method, and the kind of messa...
const ObjCMethodDecl * getMethodDecl() const
Definition: ExprObjC.h:1302
bool isVectorType() const
Definition: Type.h:6029
StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}).
Definition: Expr.h:3488
ObjCBoxedExpr - used for generalized expression boxing.
Definition: ExprObjC.h:117
SourceRange getSourceRange() const override LLVM_READONLY
Source range that this declaration covers.
Definition: DeclObjC.h:323
ExprResult ParseObjCSelectorExpression(Selector Sel, SourceLocation AtLoc, SourceLocation SelLoc, SourceLocation LParenLoc, SourceLocation RParenLoc, bool WarnMultipleSelectors)
ParseObjCSelectorExpression - Build selector expression for @selector.
MutableArrayRef< Expr * > MultiExprArg
Definition: Ownership.h:261
bool hasSameUnqualifiedType(QualType T1, QualType T2) const
Determine whether the given types are equivalent after cvr-qualifiers have been removed.
Definition: ASTContext.h:2214
static Expr * maybeUndoReclaimObject(Expr *e)
Look for an ObjCReclaimReturnedObject cast and destroy it.
bool isDesignatedInitializerForTheInterface(const ObjCMethodDecl **InitMethod=nullptr) const
Returns true if the method selector resolves to a designated initializer in the class&#39;s interface...
Definition: DeclObjC.cpp:794
SourceLocation getExprLoc() const LLVM_READONLY
getExprLoc - Return the preferred location for the arrow when diagnosing a problem with a generic exp...
Definition: Expr.cpp:216
QualType getObjCInstanceType()
Retrieve the Objective-C "instancetype" type, if already known; otherwise, returns a NULL type;...
Definition: ASTContext.h:1681
Represents a C11 generic selection.
Definition: Expr.h:4684
StringRef getName() const
Return the actual identifier string.
An Objective-C "bridged" cast expression, which casts between Objective-C pointers and C pointers...
Definition: ExprObjC.h:1572
Base class for declarations which introduce a typedef-name.
Definition: Decl.h:2796
Expr * getResultExpr()
Return the result-bearing expression, or null if there is none.
Definition: Expr.h:5024
CanQualType CharTy
Definition: ASTContext.h:998
ExprResult PerformCopyInitialization(const InitializedEntity &Entity, SourceLocation EqualLoc, ExprResult Init, bool TopLevelOfInitList=false, bool AllowExplicit=false)
Definition: SemaInit.cpp:8377
CanQualType ObjCBuiltinIdTy
Definition: ASTContext.h:1016
static ParmVarDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, SourceLocation IdLoc, IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo, StorageClass S, Expr *DefArg)
Definition: Decl.cpp:2451
Dataflow Directional Tag Classes.
bool isValid() const
Return true if this is a valid SourceLocation object.
tokloc_iterator tokloc_begin() const
Definition: Expr.h:1642
ObjCMethodDecl * lookupPrivateMethod(const Selector &Sel, bool Instance=true) const
Lookup a method in the classes implementation hierarchy.
Definition: DeclObjC.cpp:733
ExprResult BuildObjCStringLiteral(SourceLocation AtLoc, StringLiteral *S)
ObjCPropertyDecl * FindPropertyDeclaration(const IdentifierInfo *PropertyId, ObjCPropertyQueryKind QueryKind) const
FindPropertyDeclaration - Finds declaration of the property given its name in &#39;PropertyId&#39; and return...
Definition: DeclObjC.cpp:229
DeclContext - This is used only as base class of specific decl types that can act as declaration cont...
Definition: DeclBase.h:1252
ObjCMethodDecl * NSNumberLiteralMethods[NSAPI::NumNSNumberLiteralMethods]
The Objective-C NSNumber methods used to create NSNumber literals.
Definition: Sema.h:848
static bool GetFormatNSStringIdx(const FormatAttr *Format, unsigned &Idx)
FunctionDecl * getDirectCallee()
If the callee is a FunctionDecl, return it. Otherwise return 0.
Definition: Expr.cpp:1216
bool isCommitable() const
Definition: Commit.h:65
static void addFixitForObjCARCConversion(Sema &S, DiagnosticBuilder &DiagB, Sema::CheckedConversionKind CCK, SourceLocation afterLParen, QualType castType, Expr *castExpr, Expr *realCast, const char *bridgeKeyword, const char *CFBridgeName)
CharSourceRange getInsertFromRange(SourceManager &SM) const
Definition: Commit.cpp:31
bool ObjCIsSecondaryInit
True when this is an initializer method not marked as a designated initializer within a class that ha...
Definition: ScopeInfo.h:134
QualType getUnderlyingType() const
Definition: Decl.h:2847
static FixItHint CreateRemoval(CharSourceRange RemoveRange)
Create a code modification hint that removes the given source range.
Definition: Diagnostic.h:116
DeclarationName - The name of a declaration.
NamedDecl * getFoundDecl() const
Fetch the unique decl found by this lookup.
Definition: Lookup.h:520
U cast(CodeGen::Address addr)
Definition: Address.h:109
id*, id***, void (^*)(),
bool ObjCWarnForNoInitDelegation
This starts true for a secondary initializer method and will be set to false if there is an invocatio...
Definition: ScopeInfo.h:137
ExplicitCastExpr - An explicit cast written in the source code.
Definition: Expr.h:2888
DeclarationNameInfo - A collector data type for bundling together a DeclarationName and the correspnd...
Bridging via __bridge_retain, which makes an ARC object available as a +1 C pointer.
ACCResult
A result from the cast checker.
Expr * IgnoreParenImpCasts() LLVM_READONLY
IgnoreParenImpCasts - Ignore parentheses and implicit casts.
Definition: Expr.cpp:2550
ExprResult BuildInstanceMessage(Expr *Receiver, QualType ReceiverType, SourceLocation SuperLoc, Selector Sel, ObjCMethodDecl *Method, SourceLocation LBracLoc, ArrayRef< SourceLocation > SelectorLocs, SourceLocation RBracLoc, MultiExprArg Args, bool isImplicit=false)
Build an Objective-C instance message expression.
Represents a pointer to an Objective C object.
Definition: Type.h:5442
SourceRange getSourceRange() const LLVM_READONLY
Get the full source range.
Definition: TypeLoc.h:150
Name lookup found a single declaration that met the criteria.
Definition: Lookup.h:45
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:3978
ExprResult BuildObjCEncodeExpression(SourceLocation AtLoc, TypeSourceInfo *EncodedTypeInfo, SourceLocation RParenLoc)
static void DiagnoseCStringFormat