clang  8.0.0svn
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->getBeginLoc(), 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->getBeginLoc(), diag::err_no_nsconstant_string_class)
111  << NSIdent << 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 /// 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 /// 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 /// 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 /// 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 /// 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 /// 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);
403  Element->getBeginLoc(), SourceLocation());
404  InitializationSequence Seq(S, Entity, Kind, Element);
405  if (!Seq.Failed())
406  return Seq.Perform(S, Entity, Kind, Element);
407  }
408 
409  Expr *OrigElement = Element;
410 
411  // Perform lvalue-to-rvalue conversion.
412  Result = S.DefaultLvalueConversion(Element);
413  if (Result.isInvalid())
414  return ExprError();
415  Element = Result.get();
416 
417  // Make sure that we have an Objective-C pointer type or block.
418  if (!Element->getType()->isObjCObjectPointerType() &&
419  !Element->getType()->isBlockPointerType()) {
420  bool Recovered = false;
421 
422  // If this is potentially an Objective-C numeric literal, add the '@'.
423  if (isa<IntegerLiteral>(OrigElement) ||
424  isa<CharacterLiteral>(OrigElement) ||
425  isa<FloatingLiteral>(OrigElement) ||
426  isa<ObjCBoolLiteralExpr>(OrigElement) ||
427  isa<CXXBoolLiteralExpr>(OrigElement)) {
428  if (S.NSAPIObj->getNSNumberFactoryMethodKind(OrigElement->getType())) {
429  int Which = isa<CharacterLiteral>(OrigElement) ? 1
430  : (isa<CXXBoolLiteralExpr>(OrigElement) ||
431  isa<ObjCBoolLiteralExpr>(OrigElement)) ? 2
432  : 3;
433 
434  S.Diag(OrigElement->getBeginLoc(), diag::err_box_literal_collection)
435  << Which << OrigElement->getSourceRange()
436  << FixItHint::CreateInsertion(OrigElement->getBeginLoc(), "@");
437 
438  Result =
439  S.BuildObjCNumericLiteral(OrigElement->getBeginLoc(), OrigElement);
440  if (Result.isInvalid())
441  return ExprError();
442 
443  Element = Result.get();
444  Recovered = true;
445  }
446  }
447  // If this is potentially an Objective-C string literal, add the '@'.
448  else if (StringLiteral *String = dyn_cast<StringLiteral>(OrigElement)) {
449  if (String->isAscii()) {
450  S.Diag(OrigElement->getBeginLoc(), diag::err_box_literal_collection)
451  << 0 << OrigElement->getSourceRange()
452  << FixItHint::CreateInsertion(OrigElement->getBeginLoc(), "@");
453 
454  Result = S.BuildObjCStringLiteral(OrigElement->getBeginLoc(), String);
455  if (Result.isInvalid())
456  return ExprError();
457 
458  Element = Result.get();
459  Recovered = true;
460  }
461  }
462 
463  if (!Recovered) {
464  S.Diag(Element->getBeginLoc(), diag::err_invalid_collection_element)
465  << Element->getType();
466  return ExprError();
467  }
468  }
469  if (ArrayLiteral)
470  if (ObjCStringLiteral *getString =
471  dyn_cast<ObjCStringLiteral>(OrigElement)) {
472  if (StringLiteral *SL = getString->getString()) {
473  unsigned numConcat = SL->getNumConcatenated();
474  if (numConcat > 1) {
475  // Only warn if the concatenated string doesn't come from a macro.
476  bool hasMacro = false;
477  for (unsigned i = 0; i < numConcat ; ++i)
478  if (SL->getStrTokenLoc(i).isMacroID()) {
479  hasMacro = true;
480  break;
481  }
482  if (!hasMacro)
483  S.Diag(Element->getBeginLoc(),
484  diag::warn_concatenated_nsarray_literal)
485  << Element->getType();
486  }
487  }
488  }
489 
490  // Make sure that the element has the type that the container factory
491  // function expects.
492  return S.PerformCopyInitialization(
494  /*Consumed=*/false),
495  Element->getBeginLoc(), Element);
496 }
497 
499  if (ValueExpr->isTypeDependent()) {
500  ObjCBoxedExpr *BoxedExpr =
501  new (Context) ObjCBoxedExpr(ValueExpr, Context.DependentTy, nullptr, SR);
502  return BoxedExpr;
503  }
504  ObjCMethodDecl *BoxingMethod = nullptr;
505  QualType BoxedType;
506  // Convert the expression to an RValue, so we can check for pointer types...
507  ExprResult RValue = DefaultFunctionArrayLvalueConversion(ValueExpr);
508  if (RValue.isInvalid()) {
509  return ExprError();
510  }
511  SourceLocation Loc = SR.getBegin();
512  ValueExpr = RValue.get();
513  QualType ValueType(ValueExpr->getType());
514  if (const PointerType *PT = ValueType->getAs<PointerType>()) {
515  QualType PointeeType = PT->getPointeeType();
516  if (Context.hasSameUnqualifiedType(PointeeType, Context.CharTy)) {
517 
518  if (!NSStringDecl) {
519  NSStringDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
521  if (!NSStringDecl) {
522  return ExprError();
523  }
524  QualType NSStringObject = Context.getObjCInterfaceType(NSStringDecl);
525  NSStringPointer = Context.getObjCObjectPointerType(NSStringObject);
526  }
527 
528  if (!StringWithUTF8StringMethod) {
529  IdentifierInfo *II = &Context.Idents.get("stringWithUTF8String");
530  Selector stringWithUTF8String = Context.Selectors.getUnarySelector(II);
531 
532  // Look for the appropriate method within NSString.
533  BoxingMethod = NSStringDecl->lookupClassMethod(stringWithUTF8String);
534  if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) {
535  // Debugger needs to work even if NSString hasn't been defined.
536  TypeSourceInfo *ReturnTInfo = nullptr;
538  Context, SourceLocation(), SourceLocation(), stringWithUTF8String,
539  NSStringPointer, ReturnTInfo, NSStringDecl,
540  /*isInstance=*/false, /*isVariadic=*/false,
541  /*isPropertyAccessor=*/false,
542  /*isImplicitlyDeclared=*/true,
543  /*isDefined=*/false, ObjCMethodDecl::Required,
544  /*HasRelatedResultType=*/false);
545  QualType ConstCharType = Context.CharTy.withConst();
546  ParmVarDecl *value =
547  ParmVarDecl::Create(Context, M,
549  &Context.Idents.get("value"),
550  Context.getPointerType(ConstCharType),
551  /*TInfo=*/nullptr,
552  SC_None, nullptr);
553  M->setMethodParams(Context, value, None);
554  BoxingMethod = M;
555  }
556 
557  if (!validateBoxingMethod(*this, Loc, NSStringDecl,
558  stringWithUTF8String, BoxingMethod))
559  return ExprError();
560 
561  StringWithUTF8StringMethod = BoxingMethod;
562  }
563 
564  BoxingMethod = StringWithUTF8StringMethod;
565  BoxedType = NSStringPointer;
566  // Transfer the nullability from method's return type.
568  BoxingMethod->getReturnType()->getNullability(Context);
569  if (Nullability)
570  BoxedType = Context.getAttributedType(
571  AttributedType::getNullabilityAttrKind(*Nullability), BoxedType,
572  BoxedType);
573  }
574  } else if (ValueType->isBuiltinType()) {
575  // The other types we support are numeric, char and BOOL/bool. We could also
576  // provide limited support for structure types, such as NSRange, NSRect, and
577  // NSSize. See NSValue (NSValueGeometryExtensions) in <Foundation/NSGeometry.h>
578  // for more details.
579 
580  // Check for a top-level character literal.
581  if (const CharacterLiteral *Char =
582  dyn_cast<CharacterLiteral>(ValueExpr->IgnoreParens())) {
583  // In C, character literals have type 'int'. That's not the type we want
584  // to use to determine the Objective-c literal kind.
585  switch (Char->getKind()) {
588  ValueType = Context.CharTy;
589  break;
590 
592  ValueType = Context.getWideCharType();
593  break;
594 
596  ValueType = Context.Char16Ty;
597  break;
598 
600  ValueType = Context.Char32Ty;
601  break;
602  }
603  }
604  // FIXME: Do I need to do anything special with BoolTy expressions?
605 
606  // Look for the appropriate method within NSNumber.
607  BoxingMethod = getNSNumberFactoryMethod(*this, Loc, ValueType);
608  BoxedType = NSNumberPointer;
609  } else if (const EnumType *ET = ValueType->getAs<EnumType>()) {
610  if (!ET->getDecl()->isComplete()) {
611  Diag(Loc, diag::err_objc_incomplete_boxed_expression_type)
612  << ValueType << ValueExpr->getSourceRange();
613  return ExprError();
614  }
615 
616  BoxingMethod = getNSNumberFactoryMethod(*this, Loc,
617  ET->getDecl()->getIntegerType());
618  BoxedType = NSNumberPointer;
619  } else if (ValueType->isObjCBoxableRecordType()) {
620  // Support for structure types, that marked as objc_boxable
621  // struct __attribute__((objc_boxable)) s { ... };
622 
623  // Look up the NSValue class, if we haven't done so already. It's cached
624  // in the Sema instance.
625  if (!NSValueDecl) {
626  NSValueDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
628  if (!NSValueDecl) {
629  return ExprError();
630  }
631 
632  // generate the pointer to NSValue type.
633  QualType NSValueObject = Context.getObjCInterfaceType(NSValueDecl);
634  NSValuePointer = Context.getObjCObjectPointerType(NSValueObject);
635  }
636 
637  if (!ValueWithBytesObjCTypeMethod) {
638  IdentifierInfo *II[] = {
639  &Context.Idents.get("valueWithBytes"),
640  &Context.Idents.get("objCType")
641  };
642  Selector ValueWithBytesObjCType = Context.Selectors.getSelector(2, II);
643 
644  // Look for the appropriate method within NSValue.
645  BoxingMethod = NSValueDecl->lookupClassMethod(ValueWithBytesObjCType);
646  if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) {
647  // Debugger needs to work even if NSValue hasn't been defined.
648  TypeSourceInfo *ReturnTInfo = nullptr;
650  Context,
651  SourceLocation(),
652  SourceLocation(),
653  ValueWithBytesObjCType,
654  NSValuePointer,
655  ReturnTInfo,
656  NSValueDecl,
657  /*isInstance=*/false,
658  /*isVariadic=*/false,
659  /*isPropertyAccessor=*/false,
660  /*isImplicitlyDeclared=*/true,
661  /*isDefined=*/false,
663  /*HasRelatedResultType=*/false);
664 
666 
667  ParmVarDecl *bytes =
668  ParmVarDecl::Create(Context, M,
670  &Context.Idents.get("bytes"),
671  Context.VoidPtrTy.withConst(),
672  /*TInfo=*/nullptr,
673  SC_None, nullptr);
674  Params.push_back(bytes);
675 
676  QualType ConstCharType = Context.CharTy.withConst();
677  ParmVarDecl *type =
678  ParmVarDecl::Create(Context, M,
680  &Context.Idents.get("type"),
681  Context.getPointerType(ConstCharType),
682  /*TInfo=*/nullptr,
683  SC_None, nullptr);
684  Params.push_back(type);
685 
686  M->setMethodParams(Context, Params, None);
687  BoxingMethod = M;
688  }
689 
690  if (!validateBoxingMethod(*this, Loc, NSValueDecl,
691  ValueWithBytesObjCType, BoxingMethod))
692  return ExprError();
693 
694  ValueWithBytesObjCTypeMethod = BoxingMethod;
695  }
696 
697  if (!ValueType.isTriviallyCopyableType(Context)) {
698  Diag(Loc, diag::err_objc_non_trivially_copyable_boxed_expression_type)
699  << ValueType << ValueExpr->getSourceRange();
700  return ExprError();
701  }
702 
703  BoxingMethod = ValueWithBytesObjCTypeMethod;
704  BoxedType = NSValuePointer;
705  }
706 
707  if (!BoxingMethod) {
708  Diag(Loc, diag::err_objc_illegal_boxed_expression_type)
709  << ValueType << ValueExpr->getSourceRange();
710  return ExprError();
711  }
712 
713  DiagnoseUseOfDecl(BoxingMethod, Loc);
714 
715  ExprResult ConvertedValueExpr;
716  if (ValueType->isObjCBoxableRecordType()) {
718  ConvertedValueExpr = PerformCopyInitialization(IE, ValueExpr->getExprLoc(),
719  ValueExpr);
720  } else {
721  // Convert the expression to the type that the parameter requires.
722  ParmVarDecl *ParamDecl = BoxingMethod->parameters()[0];
724  ParamDecl);
725  ConvertedValueExpr = PerformCopyInitialization(IE, SourceLocation(),
726  ValueExpr);
727  }
728 
729  if (ConvertedValueExpr.isInvalid())
730  return ExprError();
731  ValueExpr = ConvertedValueExpr.get();
732 
733  ObjCBoxedExpr *BoxedExpr =
734  new (Context) ObjCBoxedExpr(ValueExpr, BoxedType,
735  BoxingMethod, SR);
736  return MaybeBindToTemporary(BoxedExpr);
737 }
738 
739 /// Build an ObjC subscript pseudo-object expression, given that
740 /// that's supported by the runtime.
742  Expr *IndexExpr,
743  ObjCMethodDecl *getterMethod,
744  ObjCMethodDecl *setterMethod) {
745  assert(!LangOpts.isSubscriptPointerArithmetic());
746 
747  // We can't get dependent types here; our callers should have
748  // filtered them out.
749  assert((!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) &&
750  "base or index cannot have dependent type here");
751 
752  // Filter out placeholders in the index. In theory, overloads could
753  // be preserved here, although that might not actually work correctly.
754  ExprResult Result = CheckPlaceholderExpr(IndexExpr);
755  if (Result.isInvalid())
756  return ExprError();
757  IndexExpr = Result.get();
758 
759  // Perform lvalue-to-rvalue conversion on the base.
760  Result = DefaultLvalueConversion(BaseExpr);
761  if (Result.isInvalid())
762  return ExprError();
763  BaseExpr = Result.get();
764 
765  // Build the pseudo-object expression.
766  return new (Context) ObjCSubscriptRefExpr(
767  BaseExpr, IndexExpr, Context.PseudoObjectTy, VK_LValue, OK_ObjCSubscript,
768  getterMethod, setterMethod, RB);
769 }
770 
772  SourceLocation Loc = SR.getBegin();
773 
774  if (!NSArrayDecl) {
775  NSArrayDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
777  if (!NSArrayDecl) {
778  return ExprError();
779  }
780  }
781 
782  // Find the arrayWithObjects:count: method, if we haven't done so already.
783  QualType IdT = Context.getObjCIdType();
784  if (!ArrayWithObjectsMethod) {
785  Selector
786  Sel = NSAPIObj->getNSArraySelector(NSAPI::NSArr_arrayWithObjectsCount);
787  ObjCMethodDecl *Method = NSArrayDecl->lookupClassMethod(Sel);
788  if (!Method && getLangOpts().DebuggerObjCLiteral) {
789  TypeSourceInfo *ReturnTInfo = nullptr;
790  Method = ObjCMethodDecl::Create(
791  Context, SourceLocation(), SourceLocation(), Sel, IdT, ReturnTInfo,
792  Context.getTranslationUnitDecl(), false /*Instance*/,
793  false /*isVariadic*/,
794  /*isPropertyAccessor=*/false,
795  /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
796  ObjCMethodDecl::Required, false);
798  ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
799  SourceLocation(),
800  SourceLocation(),
801  &Context.Idents.get("objects"),
802  Context.getPointerType(IdT),
803  /*TInfo=*/nullptr,
804  SC_None, nullptr);
805  Params.push_back(objects);
806  ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
807  SourceLocation(),
808  SourceLocation(),
809  &Context.Idents.get("cnt"),
810  Context.UnsignedLongTy,
811  /*TInfo=*/nullptr, SC_None,
812  nullptr);
813  Params.push_back(cnt);
814  Method->setMethodParams(Context, Params, None);
815  }
816 
817  if (!validateBoxingMethod(*this, Loc, NSArrayDecl, Sel, Method))
818  return ExprError();
819 
820  // Dig out the type that all elements should be converted to.
821  QualType T = Method->parameters()[0]->getType();
822  const PointerType *PtrT = T->getAs<PointerType>();
823  if (!PtrT ||
824  !Context.hasSameUnqualifiedType(PtrT->getPointeeType(), IdT)) {
825  Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
826  << Sel;
827  Diag(Method->parameters()[0]->getLocation(),
828  diag::note_objc_literal_method_param)
829  << 0 << T
830  << Context.getPointerType(IdT.withConst());
831  return ExprError();
832  }
833 
834  // Check that the 'count' parameter is integral.
835  if (!Method->parameters()[1]->getType()->isIntegerType()) {
836  Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
837  << Sel;
838  Diag(Method->parameters()[1]->getLocation(),
839  diag::note_objc_literal_method_param)
840  << 1
841  << Method->parameters()[1]->getType()
842  << "integral";
843  return ExprError();
844  }
845 
846  // We've found a good +arrayWithObjects:count: method. Save it!
847  ArrayWithObjectsMethod = Method;
848  }
849 
850  QualType ObjectsType = ArrayWithObjectsMethod->parameters()[0]->getType();
851  QualType RequiredType = ObjectsType->castAs<PointerType>()->getPointeeType();
852 
853  // Check that each of the elements provided is valid in a collection literal,
854  // performing conversions as necessary.
855  Expr **ElementsBuffer = Elements.data();
856  for (unsigned I = 0, N = Elements.size(); I != N; ++I) {
858  ElementsBuffer[I],
859  RequiredType, true);
860  if (Converted.isInvalid())
861  return ExprError();
862 
863  ElementsBuffer[I] = Converted.get();
864  }
865 
866  QualType Ty
867  = Context.getObjCObjectPointerType(
868  Context.getObjCInterfaceType(NSArrayDecl));
869 
870  return MaybeBindToTemporary(
871  ObjCArrayLiteral::Create(Context, Elements, Ty,
872  ArrayWithObjectsMethod, SR));
873 }
874 
877  SourceLocation Loc = SR.getBegin();
878 
879  if (!NSDictionaryDecl) {
880  NSDictionaryDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
882  if (!NSDictionaryDecl) {
883  return ExprError();
884  }
885  }
886 
887  // Find the dictionaryWithObjects:forKeys:count: method, if we haven't done
888  // so already.
889  QualType IdT = Context.getObjCIdType();
890  if (!DictionaryWithObjectsMethod) {
891  Selector Sel = NSAPIObj->getNSDictionarySelector(
893  ObjCMethodDecl *Method = NSDictionaryDecl->lookupClassMethod(Sel);
894  if (!Method && getLangOpts().DebuggerObjCLiteral) {
895  Method = ObjCMethodDecl::Create(Context,
896  SourceLocation(), SourceLocation(), Sel,
897  IdT,
898  nullptr /*TypeSourceInfo */,
899  Context.getTranslationUnitDecl(),
900  false /*Instance*/, false/*isVariadic*/,
901  /*isPropertyAccessor=*/false,
902  /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
904  false);
906  ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
907  SourceLocation(),
908  SourceLocation(),
909  &Context.Idents.get("objects"),
910  Context.getPointerType(IdT),
911  /*TInfo=*/nullptr, SC_None,
912  nullptr);
913  Params.push_back(objects);
914  ParmVarDecl *keys = ParmVarDecl::Create(Context, Method,
915  SourceLocation(),
916  SourceLocation(),
917  &Context.Idents.get("keys"),
918  Context.getPointerType(IdT),
919  /*TInfo=*/nullptr, SC_None,
920  nullptr);
921  Params.push_back(keys);
922  ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
923  SourceLocation(),
924  SourceLocation(),
925  &Context.Idents.get("cnt"),
926  Context.UnsignedLongTy,
927  /*TInfo=*/nullptr, SC_None,
928  nullptr);
929  Params.push_back(cnt);
930  Method->setMethodParams(Context, Params, None);
931  }
932 
933  if (!validateBoxingMethod(*this, SR.getBegin(), NSDictionaryDecl, Sel,
934  Method))
935  return ExprError();
936 
937  // Dig out the type that all values should be converted to.
938  QualType ValueT = Method->parameters()[0]->getType();
939  const PointerType *PtrValue = ValueT->getAs<PointerType>();
940  if (!PtrValue ||
941  !Context.hasSameUnqualifiedType(PtrValue->getPointeeType(), IdT)) {
942  Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
943  << Sel;
944  Diag(Method->parameters()[0]->getLocation(),
945  diag::note_objc_literal_method_param)
946  << 0 << ValueT
947  << Context.getPointerType(IdT.withConst());
948  return ExprError();
949  }
950 
951  // Dig out the type that all keys should be converted to.
952  QualType KeyT = Method->parameters()[1]->getType();
953  const PointerType *PtrKey = KeyT->getAs<PointerType>();
954  if (!PtrKey ||
955  !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
956  IdT)) {
957  bool err = true;
958  if (PtrKey) {
959  if (QIDNSCopying.isNull()) {
960  // key argument of selector is id<NSCopying>?
961  if (ObjCProtocolDecl *NSCopyingPDecl =
962  LookupProtocol(&Context.Idents.get("NSCopying"), SR.getBegin())) {
963  ObjCProtocolDecl *PQ[] = {NSCopyingPDecl};
964  QIDNSCopying =
965  Context.getObjCObjectType(Context.ObjCBuiltinIdTy, { },
966  llvm::makeArrayRef(
967  (ObjCProtocolDecl**) PQ,
968  1),
969  false);
970  QIDNSCopying = Context.getObjCObjectPointerType(QIDNSCopying);
971  }
972  }
973  if (!QIDNSCopying.isNull())
974  err = !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
975  QIDNSCopying);
976  }
977 
978  if (err) {
979  Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
980  << Sel;
981  Diag(Method->parameters()[1]->getLocation(),
982  diag::note_objc_literal_method_param)
983  << 1 << KeyT
984  << Context.getPointerType(IdT.withConst());
985  return ExprError();
986  }
987  }
988 
989  // Check that the 'count' parameter is integral.
990  QualType CountType = Method->parameters()[2]->getType();
991  if (!CountType->isIntegerType()) {
992  Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
993  << Sel;
994  Diag(Method->parameters()[2]->getLocation(),
995  diag::note_objc_literal_method_param)
996  << 2 << CountType
997  << "integral";
998  return ExprError();
999  }
1000 
1001  // We've found a good +dictionaryWithObjects:keys:count: method; save it!
1002  DictionaryWithObjectsMethod = Method;
1003  }
1004 
1005  QualType ValuesT = DictionaryWithObjectsMethod->parameters()[0]->getType();
1006  QualType ValueT = ValuesT->castAs<PointerType>()->getPointeeType();
1007  QualType KeysT = DictionaryWithObjectsMethod->parameters()[1]->getType();
1008  QualType KeyT = KeysT->castAs<PointerType>()->getPointeeType();
1009 
1010  // Check that each of the keys and values provided is valid in a collection
1011  // literal, performing conversions as necessary.
1012  bool HasPackExpansions = false;
1013  for (ObjCDictionaryElement &Element : Elements) {
1014  // Check the key.
1015  ExprResult Key = CheckObjCCollectionLiteralElement(*this, Element.Key,
1016  KeyT);
1017  if (Key.isInvalid())
1018  return ExprError();
1019 
1020  // Check the value.
1022  = CheckObjCCollectionLiteralElement(*this, Element.Value, ValueT);
1023  if (Value.isInvalid())
1024  return ExprError();
1025 
1026  Element.Key = Key.get();
1027  Element.Value = Value.get();
1028 
1029  if (Element.EllipsisLoc.isInvalid())
1030  continue;
1031 
1032  if (!Element.Key->containsUnexpandedParameterPack() &&
1033  !Element.Value->containsUnexpandedParameterPack()) {
1034  Diag(Element.EllipsisLoc,
1035  diag::err_pack_expansion_without_parameter_packs)
1036  << SourceRange(Element.Key->getBeginLoc(),
1037  Element.Value->getEndLoc());
1038  return ExprError();
1039  }
1040 
1041  HasPackExpansions = true;
1042  }
1043 
1044  QualType Ty
1045  = Context.getObjCObjectPointerType(
1046  Context.getObjCInterfaceType(NSDictionaryDecl));
1047  return MaybeBindToTemporary(ObjCDictionaryLiteral::Create(
1048  Context, Elements, HasPackExpansions, Ty,
1049  DictionaryWithObjectsMethod, SR));
1050 }
1051 
1053  TypeSourceInfo *EncodedTypeInfo,
1054  SourceLocation RParenLoc) {
1055  QualType EncodedType = EncodedTypeInfo->getType();
1056  QualType StrTy;
1057  if (EncodedType->isDependentType())
1058  StrTy = Context.DependentTy;
1059  else {
1060  if (!EncodedType->getAsArrayTypeUnsafe() && //// Incomplete array is handled.
1061  !EncodedType->isVoidType()) // void is handled too.
1062  if (RequireCompleteType(AtLoc, EncodedType,
1063  diag::err_incomplete_type_objc_at_encode,
1064  EncodedTypeInfo->getTypeLoc()))
1065  return ExprError();
1066 
1067  std::string Str;
1068  QualType NotEncodedT;
1069  Context.getObjCEncodingForType(EncodedType, Str, nullptr, &NotEncodedT);
1070  if (!NotEncodedT.isNull())
1071  Diag(AtLoc, diag::warn_incomplete_encoded_type)
1072  << EncodedType << NotEncodedT;
1073 
1074  // The type of @encode is the same as the type of the corresponding string,
1075  // which is an array type.
1076  StrTy = Context.CharTy;
1077  // A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
1078  if (getLangOpts().CPlusPlus || getLangOpts().ConstStrings)
1079  StrTy.addConst();
1080  StrTy = Context.getConstantArrayType(StrTy, llvm::APInt(32, Str.size()+1),
1081  ArrayType::Normal, 0);
1082  }
1083 
1084  return new (Context) ObjCEncodeExpr(StrTy, EncodedTypeInfo, AtLoc, RParenLoc);
1085 }
1086 
1088  SourceLocation EncodeLoc,
1089  SourceLocation LParenLoc,
1090  ParsedType ty,
1091  SourceLocation RParenLoc) {
1092  // FIXME: Preserve type source info ?
1093  TypeSourceInfo *TInfo;
1094  QualType EncodedType = GetTypeFromParser(ty, &TInfo);
1095  if (!TInfo)
1096  TInfo = Context.getTrivialTypeSourceInfo(EncodedType,
1097  getLocForEndOfToken(LParenLoc));
1098 
1099  return BuildObjCEncodeExpression(AtLoc, TInfo, RParenLoc);
1100 }
1101 
1103  SourceLocation AtLoc,
1104  SourceLocation LParenLoc,
1105  SourceLocation RParenLoc,
1106  ObjCMethodDecl *Method,
1107  ObjCMethodList &MethList) {
1108  ObjCMethodList *M = &MethList;
1109  bool Warned = false;
1110  for (M = M->getNext(); M; M=M->getNext()) {
1111  ObjCMethodDecl *MatchingMethodDecl = M->getMethod();
1112  if (MatchingMethodDecl == Method ||
1113  isa<ObjCImplDecl>(MatchingMethodDecl->getDeclContext()) ||
1114  MatchingMethodDecl->getSelector() != Method->getSelector())
1115  continue;
1116  if (!S.MatchTwoMethodDeclarations(Method,
1117  MatchingMethodDecl, Sema::MMS_loose)) {
1118  if (!Warned) {
1119  Warned = true;
1120  S.Diag(AtLoc, diag::warn_multiple_selectors)
1121  << Method->getSelector() << FixItHint::CreateInsertion(LParenLoc, "(")
1122  << FixItHint::CreateInsertion(RParenLoc, ")");
1123  S.Diag(Method->getLocation(), diag::note_method_declared_at)
1124  << Method->getDeclName();
1125  }
1126  S.Diag(MatchingMethodDecl->getLocation(), diag::note_method_declared_at)
1127  << MatchingMethodDecl->getDeclName();
1128  }
1129  }
1130  return Warned;
1131 }
1132 
1134  ObjCMethodDecl *Method,
1135  SourceLocation LParenLoc,
1136  SourceLocation RParenLoc,
1137  bool WarnMultipleSelectors) {
1138  if (!WarnMultipleSelectors ||
1139  S.Diags.isIgnored(diag::warn_multiple_selectors, SourceLocation()))
1140  return;
1141  bool Warned = false;
1142  for (Sema::GlobalMethodPool::iterator b = S.MethodPool.begin(),
1143  e = S.MethodPool.end(); b != e; b++) {
1144  // first, instance methods
1145  ObjCMethodList &InstMethList = b->second.first;
1146  if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc,
1147  Method, InstMethList))
1148  Warned = true;
1149 
1150  // second, class methods
1151  ObjCMethodList &ClsMethList = b->second.second;
1152  if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc,
1153  Method, ClsMethList) || Warned)
1154  return;
1155  }
1156 }
1157 
1159  SourceLocation AtLoc,
1160  SourceLocation SelLoc,
1161  SourceLocation LParenLoc,
1162  SourceLocation RParenLoc,
1163  bool WarnMultipleSelectors) {
1164  ObjCMethodDecl *Method = LookupInstanceMethodInGlobalPool(Sel,
1165  SourceRange(LParenLoc, RParenLoc));
1166  if (!Method)
1167  Method = LookupFactoryMethodInGlobalPool(Sel,
1168  SourceRange(LParenLoc, RParenLoc));
1169  if (!Method) {
1170  if (const ObjCMethodDecl *OM = SelectorsForTypoCorrection(Sel)) {
1171  Selector MatchedSel = OM->getSelector();
1172  SourceRange SelectorRange(LParenLoc.getLocWithOffset(1),
1173  RParenLoc.getLocWithOffset(-1));
1174  Diag(SelLoc, diag::warn_undeclared_selector_with_typo)
1175  << Sel << MatchedSel
1176  << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1177 
1178  } else
1179  Diag(SelLoc, diag::warn_undeclared_selector) << Sel;
1180  } else
1181  DiagnoseMismatchedSelectors(*this, AtLoc, Method, LParenLoc, RParenLoc,
1182  WarnMultipleSelectors);
1183 
1184  if (Method &&
1186  !getSourceManager().isInSystemHeader(Method->getLocation()))
1187  ReferencedSelectors.insert(std::make_pair(Sel, AtLoc));
1188 
1189  // In ARC, forbid the user from using @selector for
1190  // retain/release/autorelease/dealloc/retainCount.
1191  if (getLangOpts().ObjCAutoRefCount) {
1192  switch (Sel.getMethodFamily()) {
1193  case OMF_retain:
1194  case OMF_release:
1195  case OMF_autorelease:
1196  case OMF_retainCount:
1197  case OMF_dealloc:
1198  Diag(AtLoc, diag::err_arc_illegal_selector) <<
1199  Sel << SourceRange(LParenLoc, RParenLoc);
1200  break;
1201 
1202  case OMF_None:
1203  case OMF_alloc:
1204  case OMF_copy:
1205  case OMF_finalize:
1206  case OMF_init:
1207  case OMF_mutableCopy:
1208  case OMF_new:
1209  case OMF_self:
1210  case OMF_initialize:
1211  case OMF_performSelector:
1212  break;
1213  }
1214  }
1215  QualType Ty = Context.getObjCSelType();
1216  return new (Context) ObjCSelectorExpr(Ty, Sel, AtLoc, RParenLoc);
1217 }
1218 
1220  SourceLocation AtLoc,
1221  SourceLocation ProtoLoc,
1222  SourceLocation LParenLoc,
1223  SourceLocation ProtoIdLoc,
1224  SourceLocation RParenLoc) {
1225  ObjCProtocolDecl* PDecl = LookupProtocol(ProtocolId, ProtoIdLoc);
1226  if (!PDecl) {
1227  Diag(ProtoLoc, diag::err_undeclared_protocol) << ProtocolId;
1228  return true;
1229  }
1230  if (!PDecl->hasDefinition()) {
1231  Diag(ProtoLoc, diag::err_atprotocol_protocol) << PDecl;
1232  Diag(PDecl->getLocation(), diag::note_entity_declared_at) << PDecl;
1233  } else {
1234  PDecl = PDecl->getDefinition();
1235  }
1236 
1237  QualType Ty = Context.getObjCProtoType();
1238  if (Ty.isNull())
1239  return true;
1240  Ty = Context.getObjCObjectPointerType(Ty);
1241  return new (Context) ObjCProtocolExpr(Ty, PDecl, AtLoc, ProtoIdLoc, RParenLoc);
1242 }
1243 
1244 /// Try to capture an implicit reference to 'self'.
1246  DeclContext *DC = getFunctionLevelDeclContext();
1247 
1248  // If we're not in an ObjC method, error out. Note that, unlike the
1249  // C++ case, we don't require an instance method --- class methods
1250  // still have a 'self', and we really do still need to capture it!
1251  ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(DC);
1252  if (!method)
1253  return nullptr;
1254 
1255  tryCaptureVariable(method->getSelfDecl(), Loc);
1256 
1257  return method;
1258 }
1259 
1261  QualType origType = T;
1262  if (auto nullability = AttributedType::stripOuterNullability(T)) {
1263  if (T == Context.getObjCInstanceType()) {
1264  return Context.getAttributedType(
1266  Context.getObjCIdType(),
1267  Context.getObjCIdType());
1268  }
1269 
1270  return origType;
1271  }
1272 
1273  if (T == Context.getObjCInstanceType())
1274  return Context.getObjCIdType();
1275 
1276  return origType;
1277 }
1278 
1279 /// Determine the result type of a message send based on the receiver type,
1280 /// method, and the kind of message send.
1281 ///
1282 /// This is the "base" result type, which will still need to be adjusted
1283 /// to account for nullability.
1285  QualType ReceiverType,
1286  ObjCMethodDecl *Method,
1287  bool isClassMessage,
1288  bool isSuperMessage) {
1289  assert(Method && "Must have a method");
1290  if (!Method->hasRelatedResultType())
1291  return Method->getSendResultType(ReceiverType);
1292 
1293  ASTContext &Context = S.Context;
1294 
1295  // Local function that transfers the nullability of the method's
1296  // result type to the returned result.
1297  auto transferNullability = [&](QualType type) -> QualType {
1298  // If the method's result type has nullability, extract it.
1299  if (auto nullability = Method->getSendResultType(ReceiverType)
1300  ->getNullability(Context)){
1301  // Strip off any outer nullability sugar from the provided type.
1303 
1304  // Form a new attributed type using the method result type's nullability.
1305  return Context.getAttributedType(
1307  type,
1308  type);
1309  }
1310 
1311  return type;
1312  };
1313 
1314  // If a method has a related return type:
1315  // - if the method found is an instance method, but the message send
1316  // was a class message send, T is the declared return type of the method
1317  // found
1318  if (Method->isInstanceMethod() && isClassMessage)
1319  return stripObjCInstanceType(Context,
1320  Method->getSendResultType(ReceiverType));
1321 
1322  // - if the receiver is super, T is a pointer to the class of the
1323  // enclosing method definition
1324  if (isSuperMessage) {
1325  if (ObjCMethodDecl *CurMethod = S.getCurMethodDecl())
1326  if (ObjCInterfaceDecl *Class = CurMethod->getClassInterface()) {
1327  return transferNullability(
1328  Context.getObjCObjectPointerType(
1329  Context.getObjCInterfaceType(Class)));
1330  }
1331  }
1332 
1333  // - if the receiver is the name of a class U, T is a pointer to U
1334  if (ReceiverType->getAsObjCInterfaceType())
1335  return transferNullability(Context.getObjCObjectPointerType(ReceiverType));
1336  // - if the receiver is of type Class or qualified Class type,
1337  // T is the declared return type of the method.
1338  if (ReceiverType->isObjCClassType() ||
1339  ReceiverType->isObjCQualifiedClassType())
1340  return stripObjCInstanceType(Context,
1341  Method->getSendResultType(ReceiverType));
1342 
1343  // - if the receiver is id, qualified id, Class, or qualified Class, T
1344  // is the receiver type, otherwise
1345  // - T is the type of the receiver expression.
1346  return transferNullability(ReceiverType);
1347 }
1348 
1350  ObjCMethodDecl *Method,
1351  bool isClassMessage,
1352  bool isSuperMessage) {
1353  // Produce the result type.
1354  QualType resultType = getBaseMessageSendResultType(*this, ReceiverType,
1355  Method,
1356  isClassMessage,
1357  isSuperMessage);
1358 
1359  // If this is a class message, ignore the nullability of the receiver.
1360  if (isClassMessage)
1361  return resultType;
1362 
1363  // There is nothing left to do if the result type cannot have a nullability
1364  // specifier.
1365  if (!resultType->canHaveNullability())
1366  return resultType;
1367 
1368  // Map the nullability of the result into a table index.
1369  unsigned receiverNullabilityIdx = 0;
1370  if (auto nullability = ReceiverType->getNullability(Context))
1371  receiverNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1372 
1373  unsigned resultNullabilityIdx = 0;
1374  if (auto nullability = resultType->getNullability(Context))
1375  resultNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1376 
1377  // The table of nullability mappings, indexed by the receiver's nullability
1378  // and then the result type's nullability.
1379  static const uint8_t None = 0;
1380  static const uint8_t NonNull = 1;
1381  static const uint8_t Nullable = 2;
1382  static const uint8_t Unspecified = 3;
1383  static const uint8_t nullabilityMap[4][4] = {
1384  // None NonNull Nullable Unspecified
1385  /* None */ { None, None, Nullable, None },
1386  /* NonNull */ { None, NonNull, Nullable, Unspecified },
1387  /* Nullable */ { Nullable, Nullable, Nullable, Nullable },
1388  /* Unspecified */ { None, Unspecified, Nullable, Unspecified }
1389  };
1390 
1391  unsigned newResultNullabilityIdx
1392  = nullabilityMap[receiverNullabilityIdx][resultNullabilityIdx];
1393  if (newResultNullabilityIdx == resultNullabilityIdx)
1394  return resultType;
1395 
1396  // Strip off the existing nullability. This removes as little type sugar as
1397  // possible.
1398  do {
1399  if (auto attributed = dyn_cast<AttributedType>(resultType.getTypePtr())) {
1400  resultType = attributed->getModifiedType();
1401  } else {
1402  resultType = resultType.getDesugaredType(Context);
1403  }
1404  } while (resultType->getNullability(Context));
1405 
1406  // Add nullability back if needed.
1407  if (newResultNullabilityIdx > 0) {
1408  auto newNullability
1409  = static_cast<NullabilityKind>(newResultNullabilityIdx-1);
1410  return Context.getAttributedType(
1412  resultType, resultType);
1413  }
1414 
1415  return resultType;
1416 }
1417 
1418 /// Look for an ObjC method whose result type exactly matches the given type.
1419 static const ObjCMethodDecl *
1421  QualType instancetype) {
1422  if (MD->getReturnType() == instancetype)
1423  return MD;
1424 
1425  // For these purposes, a method in an @implementation overrides a
1426  // declaration in the @interface.
1427  if (const ObjCImplDecl *impl =
1428  dyn_cast<ObjCImplDecl>(MD->getDeclContext())) {
1429  const ObjCContainerDecl *iface;
1430  if (const ObjCCategoryImplDecl *catImpl =
1431  dyn_cast<ObjCCategoryImplDecl>(impl)) {
1432  iface = catImpl->getCategoryDecl();
1433  } else {
1434  iface = impl->getClassInterface();
1435  }
1436 
1437  const ObjCMethodDecl *ifaceMD =
1438  iface->getMethod(MD->getSelector(), MD->isInstanceMethod());
1439  if (ifaceMD) return findExplicitInstancetypeDeclarer(ifaceMD, instancetype);
1440  }
1441 
1443  MD->getOverriddenMethods(overrides);
1444  for (unsigned i = 0, e = overrides.size(); i != e; ++i) {
1445  if (const ObjCMethodDecl *result =
1446  findExplicitInstancetypeDeclarer(overrides[i], instancetype))
1447  return result;
1448  }
1449 
1450  return nullptr;
1451 }
1452 
1454  // Only complain if we're in an ObjC method and the required return
1455  // type doesn't match the method's declared return type.
1456  ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurContext);
1457  if (!MD || !MD->hasRelatedResultType() ||
1458  Context.hasSameUnqualifiedType(destType, MD->getReturnType()))
1459  return;
1460 
1461  // Look for a method overridden by this method which explicitly uses
1462  // 'instancetype'.
1463  if (const ObjCMethodDecl *overridden =
1465  SourceRange range = overridden->getReturnTypeSourceRange();
1466  SourceLocation loc = range.getBegin();
1467  if (loc.isInvalid())
1468  loc = overridden->getLocation();
1469  Diag(loc, diag::note_related_result_type_explicit)
1470  << /*current method*/ 1 << range;
1471  return;
1472  }
1473 
1474  // Otherwise, if we have an interesting method family, note that.
1475  // This should always trigger if the above didn't.
1476  if (ObjCMethodFamily family = MD->getMethodFamily())
1477  Diag(MD->getLocation(), diag::note_related_result_type_family)
1478  << /*current method*/ 1
1479  << family;
1480 }
1481 
1483  E = E->IgnoreParenImpCasts();
1484  const ObjCMessageExpr *MsgSend = dyn_cast<ObjCMessageExpr>(E);
1485  if (!MsgSend)
1486  return;
1487 
1488  const ObjCMethodDecl *Method = MsgSend->getMethodDecl();
1489  if (!Method)
1490  return;
1491 
1492  if (!Method->hasRelatedResultType())
1493  return;
1494 
1495  if (Context.hasSameUnqualifiedType(
1496  Method->getReturnType().getNonReferenceType(), MsgSend->getType()))
1497  return;
1498 
1499  if (!Context.hasSameUnqualifiedType(Method->getReturnType(),
1500  Context.getObjCInstanceType()))
1501  return;
1502 
1503  Diag(Method->getLocation(), diag::note_related_result_type_inferred)
1504  << Method->isInstanceMethod() << Method->getSelector()
1505  << MsgSend->getType();
1506 }
1507 
1509  MultiExprArg Args,
1510  Selector Sel,
1511  ArrayRef<SourceLocation> SelectorLocs,
1512  ObjCMethodDecl *Method,
1513  bool isClassMessage, bool isSuperMessage,
1514  SourceLocation lbrac, SourceLocation rbrac,
1515  SourceRange RecRange,
1516  QualType &ReturnType, ExprValueKind &VK) {
1517  SourceLocation SelLoc;
1518  if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
1519  SelLoc = SelectorLocs.front();
1520  else
1521  SelLoc = lbrac;
1522 
1523  if (!Method) {
1524  // Apply default argument promotion as for (C99 6.5.2.2p6).
1525  for (unsigned i = 0, e = Args.size(); i != e; i++) {
1526  if (Args[i]->isTypeDependent())
1527  continue;
1528 
1529  ExprResult result;
1530  if (getLangOpts().DebuggerSupport) {
1531  QualType paramTy; // ignored
1532  result = checkUnknownAnyArg(SelLoc, Args[i], paramTy);
1533  } else {
1534  result = DefaultArgumentPromotion(Args[i]);
1535  }
1536  if (result.isInvalid())
1537  return true;
1538  Args[i] = result.get();
1539  }
1540 
1541  unsigned DiagID;
1542  if (getLangOpts().ObjCAutoRefCount)
1543  DiagID = diag::err_arc_method_not_found;
1544  else
1545  DiagID = isClassMessage ? diag::warn_class_method_not_found
1546  : diag::warn_inst_method_not_found;
1547  if (!getLangOpts().DebuggerSupport) {
1548  const ObjCMethodDecl *OMD = SelectorsForTypoCorrection(Sel, ReceiverType);
1549  if (OMD && !OMD->isInvalidDecl()) {
1550  if (getLangOpts().ObjCAutoRefCount)
1551  DiagID = diag::err_method_not_found_with_typo;
1552  else
1553  DiagID = isClassMessage ? diag::warn_class_method_not_found_with_typo
1554  : diag::warn_instance_method_not_found_with_typo;
1555  Selector MatchedSel = OMD->getSelector();
1556  SourceRange SelectorRange(SelectorLocs.front(), SelectorLocs.back());
1557  if (MatchedSel.isUnarySelector())
1558  Diag(SelLoc, DiagID)
1559  << Sel<< isClassMessage << MatchedSel
1560  << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1561  else
1562  Diag(SelLoc, DiagID) << Sel<< isClassMessage << MatchedSel;
1563  }
1564  else
1565  Diag(SelLoc, DiagID)
1566  << Sel << isClassMessage << SourceRange(SelectorLocs.front(),
1567  SelectorLocs.back());
1568  // Find the class to which we are sending this message.
1569  if (ReceiverType->isObjCObjectPointerType()) {
1570  if (ObjCInterfaceDecl *ThisClass =
1571  ReceiverType->getAs<ObjCObjectPointerType>()->getInterfaceDecl()) {
1572  Diag(ThisClass->getLocation(), diag::note_receiver_class_declared);
1573  if (!RecRange.isInvalid())
1574  if (ThisClass->lookupClassMethod(Sel))
1575  Diag(RecRange.getBegin(),diag::note_receiver_expr_here)
1576  << FixItHint::CreateReplacement(RecRange,
1577  ThisClass->getNameAsString());
1578  }
1579  }
1580  }
1581 
1582  // In debuggers, we want to use __unknown_anytype for these
1583  // results so that clients can cast them.
1584  if (getLangOpts().DebuggerSupport) {
1585  ReturnType = Context.UnknownAnyTy;
1586  } else {
1587  ReturnType = Context.getObjCIdType();
1588  }
1589  VK = VK_RValue;
1590  return false;
1591  }
1592 
1593  ReturnType = getMessageSendResultType(ReceiverType, Method, isClassMessage,
1594  isSuperMessage);
1595  VK = Expr::getValueKindForType(Method->getReturnType());
1596 
1597  unsigned NumNamedArgs = Sel.getNumArgs();
1598  // Method might have more arguments than selector indicates. This is due
1599  // to addition of c-style arguments in method.
1600  if (Method->param_size() > Sel.getNumArgs())
1601  NumNamedArgs = Method->param_size();
1602  // FIXME. This need be cleaned up.
1603  if (Args.size() < NumNamedArgs) {
1604  Diag(SelLoc, diag::err_typecheck_call_too_few_args)
1605  << 2 << NumNamedArgs << static_cast<unsigned>(Args.size());
1606  return false;
1607  }
1608 
1609  // Compute the set of type arguments to be substituted into each parameter
1610  // type.
1611  Optional<ArrayRef<QualType>> typeArgs
1612  = ReceiverType->getObjCSubstitutions(Method->getDeclContext());
1613  bool IsError = false;
1614  for (unsigned i = 0; i < NumNamedArgs; i++) {
1615  // We can't do any type-checking on a type-dependent argument.
1616  if (Args[i]->isTypeDependent())
1617  continue;
1618 
1619  Expr *argExpr = Args[i];
1620 
1621  ParmVarDecl *param = Method->parameters()[i];
1622  assert(argExpr && "CheckMessageArgumentTypes(): missing expression");
1623 
1624  if (param->hasAttr<NoEscapeAttr>())
1625  if (auto *BE = dyn_cast<BlockExpr>(
1626  argExpr->IgnoreParenNoopCasts(Context)))
1627  BE->getBlockDecl()->setDoesNotEscape();
1628 
1629  // Strip the unbridged-cast placeholder expression off unless it's
1630  // a consumed argument.
1631  if (argExpr->hasPlaceholderType(BuiltinType::ARCUnbridgedCast) &&
1632  !param->hasAttr<CFConsumedAttr>())
1633  argExpr = stripARCUnbridgedCast(argExpr);
1634 
1635  // If the parameter is __unknown_anytype, infer its type
1636  // from the argument.
1637  if (param->getType() == Context.UnknownAnyTy) {
1638  QualType paramType;
1639  ExprResult argE = checkUnknownAnyArg(SelLoc, argExpr, paramType);
1640  if (argE.isInvalid()) {
1641  IsError = true;
1642  } else {
1643  Args[i] = argE.get();
1644 
1645  // Update the parameter type in-place.
1646  param->setType(paramType);
1647  }
1648  continue;
1649  }
1650 
1651  QualType origParamType = param->getType();
1652  QualType paramType = param->getType();
1653  if (typeArgs)
1654  paramType = paramType.substObjCTypeArgs(
1655  Context,
1656  *typeArgs,
1658 
1659  if (RequireCompleteType(argExpr->getSourceRange().getBegin(),
1660  paramType,
1661  diag::err_call_incomplete_argument, argExpr))
1662  return true;
1663 
1664  InitializedEntity Entity
1665  = InitializedEntity::InitializeParameter(Context, param, paramType);
1666  ExprResult ArgE = PerformCopyInitialization(Entity, SourceLocation(), argExpr);
1667  if (ArgE.isInvalid())
1668  IsError = true;
1669  else {
1670  Args[i] = ArgE.getAs<Expr>();
1671 
1672  // If we are type-erasing a block to a block-compatible
1673  // Objective-C pointer type, we may need to extend the lifetime
1674  // of the block object.
1675  if (typeArgs && Args[i]->isRValue() && paramType->isBlockPointerType() &&
1676  Args[i]->getType()->isBlockPointerType() &&
1677  origParamType->isObjCObjectPointerType()) {
1678  ExprResult arg = Args[i];
1679  maybeExtendBlockObject(arg);
1680  Args[i] = arg.get();
1681  }
1682  }
1683  }
1684 
1685  // Promote additional arguments to variadic methods.
1686  if (Method->isVariadic()) {
1687  for (unsigned i = NumNamedArgs, e = Args.size(); i < e; ++i) {
1688  if (Args[i]->isTypeDependent())
1689  continue;
1690 
1691  ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], VariadicMethod,
1692  nullptr);
1693  IsError |= Arg.isInvalid();
1694  Args[i] = Arg.get();
1695  }
1696  } else {
1697  // Check for extra arguments to non-variadic methods.
1698  if (Args.size() != NumNamedArgs) {
1699  Diag(Args[NumNamedArgs]->getBeginLoc(),
1700  diag::err_typecheck_call_too_many_args)
1701  << 2 /*method*/ << NumNamedArgs << static_cast<unsigned>(Args.size())
1702  << Method->getSourceRange()
1703  << SourceRange(Args[NumNamedArgs]->getBeginLoc(),
1704  Args.back()->getEndLoc());
1705  }
1706  }
1707 
1708  DiagnoseSentinelCalls(Method, SelLoc, Args);
1709 
1710  // Do additional checkings on method.
1711  IsError |= CheckObjCMethodCall(
1712  Method, SelLoc, makeArrayRef(Args.data(), Args.size()));
1713 
1714  return IsError;
1715 }
1716 
1717 bool Sema::isSelfExpr(Expr *RExpr) {
1718  // 'self' is objc 'self' in an objc method only.
1719  ObjCMethodDecl *Method =
1720  dyn_cast_or_null<ObjCMethodDecl>(CurContext->getNonClosureAncestor());
1721  return isSelfExpr(RExpr, Method);
1722 }
1723 
1724 bool Sema::isSelfExpr(Expr *receiver, const ObjCMethodDecl *method) {
1725  if (!method) return false;
1726 
1727  receiver = receiver->IgnoreParenLValueCasts();
1728  if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(receiver))
1729  if (DRE->getDecl() == method->getSelfDecl())
1730  return true;
1731  return false;
1732 }
1733 
1734 /// LookupMethodInType - Look up a method in an ObjCObjectType.
1736  bool isInstance) {
1737  const ObjCObjectType *objType = type->castAs<ObjCObjectType>();
1738  if (ObjCInterfaceDecl *iface = objType->getInterface()) {
1739  // Look it up in the main interface (and categories, etc.)
1740  if (ObjCMethodDecl *method = iface->lookupMethod(sel, isInstance))
1741  return method;
1742 
1743  // Okay, look for "private" methods declared in any
1744  // @implementations we've seen.
1745  if (ObjCMethodDecl *method = iface->lookupPrivateMethod(sel, isInstance))
1746  return method;
1747  }
1748 
1749  // Check qualifiers.
1750  for (const auto *I : objType->quals())
1751  if (ObjCMethodDecl *method = I->lookupMethod(sel, isInstance))
1752  return method;
1753 
1754  return nullptr;
1755 }
1756 
1757 /// LookupMethodInQualifiedType - Lookups up a method in protocol qualifier
1758 /// list of a qualified objective pointer type.
1760  const ObjCObjectPointerType *OPT,
1761  bool Instance)
1762 {
1763  ObjCMethodDecl *MD = nullptr;
1764  for (const auto *PROTO : OPT->quals()) {
1765  if ((MD = PROTO->lookupMethod(Sel, Instance))) {
1766  return MD;
1767  }
1768  }
1769  return nullptr;
1770 }
1771 
1772 /// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an
1773 /// objective C interface. This is a property reference expression.
1776  Expr *BaseExpr, SourceLocation OpLoc,
1777  DeclarationName MemberName,
1778  SourceLocation MemberLoc,
1779  SourceLocation SuperLoc, QualType SuperType,
1780  bool Super) {
1781  const ObjCInterfaceType *IFaceT = OPT->getInterfaceType();
1782  ObjCInterfaceDecl *IFace = IFaceT->getDecl();
1783 
1784  if (!MemberName.isIdentifier()) {
1785  Diag(MemberLoc, diag::err_invalid_property_name)
1786  << MemberName << QualType(OPT, 0);
1787  return ExprError();
1788  }
1789 
1790  IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
1791 
1792  SourceRange BaseRange = Super? SourceRange(SuperLoc)
1793  : BaseExpr->getSourceRange();
1794  if (RequireCompleteType(MemberLoc, OPT->getPointeeType(),
1795  diag::err_property_not_found_forward_class,
1796  MemberName, BaseRange))
1797  return ExprError();
1798 
1799  if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(
1801  // Check whether we can reference this property.
1802  if (DiagnoseUseOfDecl(PD, MemberLoc))
1803  return ExprError();
1804  if (Super)
1805  return new (Context)
1807  OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1808  else
1809  return new (Context)
1811  OK_ObjCProperty, MemberLoc, BaseExpr);
1812  }
1813  // Check protocols on qualified interfaces.
1814  for (const auto *I : OPT->quals())
1815  if (ObjCPropertyDecl *PD = I->FindPropertyDeclaration(
1817  // Check whether we can reference this property.
1818  if (DiagnoseUseOfDecl(PD, MemberLoc))
1819  return ExprError();
1820 
1821  if (Super)
1822  return new (Context) ObjCPropertyRefExpr(
1823  PD, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty, MemberLoc,
1824  SuperLoc, SuperType);
1825  else
1826  return new (Context)
1828  OK_ObjCProperty, MemberLoc, BaseExpr);
1829  }
1830  // If that failed, look for an "implicit" property by seeing if the nullary
1831  // selector is implemented.
1832 
1833  // FIXME: The logic for looking up nullary and unary selectors should be
1834  // shared with the code in ActOnInstanceMessage.
1835 
1836  Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
1837  ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
1838 
1839  // May be found in property's qualified list.
1840  if (!Getter)
1841  Getter = LookupMethodInQualifiedType(Sel, OPT, true);
1842 
1843  // If this reference is in an @implementation, check for 'private' methods.
1844  if (!Getter)
1845  Getter = IFace->lookupPrivateMethod(Sel);
1846 
1847  if (Getter) {
1848  // Check if we can reference this property.
1849  if (DiagnoseUseOfDecl(Getter, MemberLoc))
1850  return ExprError();
1851  }
1852  // If we found a getter then this may be a valid dot-reference, we
1853  // will look for the matching setter, in case it is needed.
1854  Selector SetterSel =
1855  SelectorTable::constructSetterSelector(PP.getIdentifierTable(),
1856  PP.getSelectorTable(), Member);
1857  ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel);
1858 
1859  // May be found in property's qualified list.
1860  if (!Setter)
1861  Setter = LookupMethodInQualifiedType(SetterSel, OPT, true);
1862 
1863  if (!Setter) {
1864  // If this reference is in an @implementation, also check for 'private'
1865  // methods.
1866  Setter = IFace->lookupPrivateMethod(SetterSel);
1867  }
1868 
1869  if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc))
1870  return ExprError();
1871 
1872  // Special warning if member name used in a property-dot for a setter accessor
1873  // does not use a property with same name; e.g. obj.X = ... for a property with
1874  // name 'x'.
1875  if (Setter && Setter->isImplicit() && Setter->isPropertyAccessor() &&
1876  !IFace->FindPropertyDeclaration(
1878  if (const ObjCPropertyDecl *PDecl = Setter->findPropertyDecl()) {
1879  // Do not warn if user is using property-dot syntax to make call to
1880  // user named setter.
1881  if (!(PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter))
1882  Diag(MemberLoc,
1883  diag::warn_property_access_suggest)
1884  << MemberName << QualType(OPT, 0) << PDecl->getName()
1885  << FixItHint::CreateReplacement(MemberLoc, PDecl->getName());
1886  }
1887  }
1888 
1889  if (Getter || Setter) {
1890  if (Super)
1891  return new (Context)
1892  ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1893  OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1894  else
1895  return new (Context)
1896  ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1897  OK_ObjCProperty, MemberLoc, BaseExpr);
1898 
1899  }
1900 
1901  // Attempt to correct for typos in property names.
1902  if (TypoCorrection Corrected =
1903  CorrectTypo(DeclarationNameInfo(MemberName, MemberLoc),
1904  LookupOrdinaryName, nullptr, nullptr,
1905  llvm::make_unique<DeclFilterCCC<ObjCPropertyDecl>>(),
1906  CTK_ErrorRecovery, IFace, false, OPT)) {
1907  DeclarationName TypoResult = Corrected.getCorrection();
1908  if (TypoResult.isIdentifier() &&
1909  TypoResult.getAsIdentifierInfo() == Member) {
1910  // There is no need to try the correction if it is the same.
1911  NamedDecl *ChosenDecl =
1912  Corrected.isKeyword() ? nullptr : Corrected.getFoundDecl();
1913  if (ChosenDecl && isa<ObjCPropertyDecl>(ChosenDecl))
1914  if (cast<ObjCPropertyDecl>(ChosenDecl)->isClassProperty()) {
1915  // This is a class property, we should not use the instance to
1916  // access it.
1917  Diag(MemberLoc, diag::err_class_property_found) << MemberName
1918  << OPT->getInterfaceDecl()->getName()
1920  OPT->getInterfaceDecl()->getName());
1921  return ExprError();
1922  }
1923  } else {
1924  diagnoseTypo(Corrected, PDiag(diag::err_property_not_found_suggest)
1925  << MemberName << QualType(OPT, 0));
1926  return HandleExprPropertyRefExpr(OPT, BaseExpr, OpLoc,
1927  TypoResult, MemberLoc,
1928  SuperLoc, SuperType, Super);
1929  }
1930  }
1931  ObjCInterfaceDecl *ClassDeclared;
1932  if (ObjCIvarDecl *Ivar =
1933  IFace->lookupInstanceVariable(Member, ClassDeclared)) {
1934  QualType T = Ivar->getType();
1935  if (const ObjCObjectPointerType * OBJPT =
1937  if (RequireCompleteType(MemberLoc, OBJPT->getPointeeType(),
1938  diag::err_property_not_as_forward_class,
1939  MemberName, BaseExpr))
1940  return ExprError();
1941  }
1942  Diag(MemberLoc,
1943  diag::err_ivar_access_using_property_syntax_suggest)
1944  << MemberName << QualType(OPT, 0) << Ivar->getDeclName()
1945  << FixItHint::CreateReplacement(OpLoc, "->");
1946  return ExprError();
1947  }
1948 
1949  Diag(MemberLoc, diag::err_property_not_found)
1950  << MemberName << QualType(OPT, 0);
1951  if (Setter)
1952  Diag(Setter->getLocation(), diag::note_getter_unavailable)
1953  << MemberName << BaseExpr->getSourceRange();
1954  return ExprError();
1955 }
1956 
1959  IdentifierInfo &propertyName,
1960  SourceLocation receiverNameLoc,
1961  SourceLocation propertyNameLoc) {
1962 
1963  IdentifierInfo *receiverNamePtr = &receiverName;
1964  ObjCInterfaceDecl *IFace = getObjCInterfaceDecl(receiverNamePtr,
1965  receiverNameLoc);
1966 
1967  QualType SuperType;
1968  if (!IFace) {
1969  // If the "receiver" is 'super' in a method, handle it as an expression-like
1970  // property reference.
1971  if (receiverNamePtr->isStr("super")) {
1972  if (ObjCMethodDecl *CurMethod = tryCaptureObjCSelf(receiverNameLoc)) {
1973  if (auto classDecl = CurMethod->getClassInterface()) {
1974  SuperType = QualType(classDecl->getSuperClassType(), 0);
1975  if (CurMethod->isInstanceMethod()) {
1976  if (SuperType.isNull()) {
1977  // The current class does not have a superclass.
1978  Diag(receiverNameLoc, diag::err_root_class_cannot_use_super)
1979  << CurMethod->getClassInterface()->getIdentifier();
1980  return ExprError();
1981  }
1982  QualType T = Context.getObjCObjectPointerType(SuperType);
1983 
1984  return HandleExprPropertyRefExpr(T->castAs<ObjCObjectPointerType>(),
1985  /*BaseExpr*/nullptr,
1986  SourceLocation()/*OpLoc*/,
1987  &propertyName,
1988  propertyNameLoc,
1989  receiverNameLoc, T, true);
1990  }
1991 
1992  // Otherwise, if this is a class method, try dispatching to our
1993  // superclass.
1994  IFace = CurMethod->getClassInterface()->getSuperClass();
1995  }
1996  }
1997  }
1998 
1999  if (!IFace) {
2000  Diag(receiverNameLoc, diag::err_expected_either) << tok::identifier
2001  << tok::l_paren;
2002  return ExprError();
2003  }
2004  }
2005 
2006  Selector GetterSel;
2007  Selector SetterSel;
2008  if (auto PD = IFace->FindPropertyDeclaration(
2010  GetterSel = PD->getGetterName();
2011  SetterSel = PD->getSetterName();
2012  } else {
2013  GetterSel = PP.getSelectorTable().getNullarySelector(&propertyName);
2015  PP.getIdentifierTable(), PP.getSelectorTable(), &propertyName);
2016  }
2017 
2018  // Search for a declared property first.
2019  ObjCMethodDecl *Getter = IFace->lookupClassMethod(GetterSel);
2020 
2021  // If this reference is in an @implementation, check for 'private' methods.
2022  if (!Getter)
2023  Getter = IFace->lookupPrivateClassMethod(GetterSel);
2024 
2025  if (Getter) {
2026  // FIXME: refactor/share with ActOnMemberReference().
2027  // Check if we can reference this property.
2028  if (DiagnoseUseOfDecl(Getter, propertyNameLoc))
2029  return ExprError();
2030  }
2031 
2032  // Look for the matching setter, in case it is needed.
2033  ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel);
2034  if (!Setter) {
2035  // If this reference is in an @implementation, also check for 'private'
2036  // methods.
2037  Setter = IFace->lookupPrivateClassMethod(SetterSel);
2038  }
2039  // Look through local category implementations associated with the class.
2040  if (!Setter)
2041  Setter = IFace->getCategoryClassMethod(SetterSel);
2042 
2043  if (Setter && DiagnoseUseOfDecl(Setter, propertyNameLoc))
2044  return ExprError();
2045 
2046  if (Getter || Setter) {
2047  if (!SuperType.isNull())
2048  return new (Context)
2049  ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
2050  OK_ObjCProperty, propertyNameLoc, receiverNameLoc,
2051  SuperType);
2052 
2053  return new (Context) ObjCPropertyRefExpr(
2054  Getter, Setter, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty,
2055  propertyNameLoc, receiverNameLoc, IFace);
2056  }
2057  return ExprError(Diag(propertyNameLoc, diag::err_property_not_found)
2058  << &propertyName << Context.getObjCInterfaceType(IFace));
2059 }
2060 
2061 namespace {
2062 
2063 class ObjCInterfaceOrSuperCCC : public CorrectionCandidateCallback {
2064  public:
2065  ObjCInterfaceOrSuperCCC(ObjCMethodDecl *Method) {
2066  // Determine whether "super" is acceptable in the current context.
2067  if (Method && Method->getClassInterface())
2068  WantObjCSuper = Method->getClassInterface()->getSuperClass();
2069  }
2070 
2071  bool ValidateCandidate(const TypoCorrection &candidate) override {
2072  return candidate.getCorrectionDeclAs<ObjCInterfaceDecl>() ||
2073  candidate.isKeyword("super");
2074  }
2075 };
2076 
2077 } // end anonymous namespace
2078 
2080  IdentifierInfo *Name,
2081  SourceLocation NameLoc,
2082  bool IsSuper,
2083  bool HasTrailingDot,
2084  ParsedType &ReceiverType) {
2085  ReceiverType = nullptr;
2086 
2087  // If the identifier is "super" and there is no trailing dot, we're
2088  // messaging super. If the identifier is "super" and there is a
2089  // trailing dot, it's an instance message.
2090  if (IsSuper && S->isInObjcMethodScope())
2091  return HasTrailingDot? ObjCInstanceMessage : ObjCSuperMessage;
2092 
2093  LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName);
2094  LookupName(Result, S);
2095 
2096  switch (Result.getResultKind()) {
2098  // Normal name lookup didn't find anything. If we're in an
2099  // Objective-C method, look for ivars. If we find one, we're done!
2100  // FIXME: This is a hack. Ivar lookup should be part of normal
2101  // lookup.
2102  if (ObjCMethodDecl *Method = getCurMethodDecl()) {
2103  if (!Method->getClassInterface()) {
2104  // Fall back: let the parser try to parse it as an instance message.
2105  return ObjCInstanceMessage;
2106  }
2107 
2108  ObjCInterfaceDecl *ClassDeclared;
2109  if (Method->getClassInterface()->lookupInstanceVariable(Name,
2110  ClassDeclared))
2111  return ObjCInstanceMessage;
2112  }
2113 
2114  // Break out; we'll perform typo correction below.
2115  break;
2116 
2121  Result.suppressDiagnostics();
2122  return ObjCInstanceMessage;
2123 
2124  case LookupResult::Found: {
2125  // If the identifier is a class or not, and there is a trailing dot,
2126  // it's an instance message.
2127  if (HasTrailingDot)
2128  return ObjCInstanceMessage;
2129  // We found something. If it's a type, then we have a class
2130  // message. Otherwise, it's an instance message.
2131  NamedDecl *ND = Result.getFoundDecl();
2132  QualType T;
2133  if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND))
2134  T = Context.getObjCInterfaceType(Class);
2135  else if (TypeDecl *Type = dyn_cast<TypeDecl>(ND)) {
2136  T = Context.getTypeDeclType(Type);
2137  DiagnoseUseOfDecl(Type, NameLoc);
2138  }
2139  else
2140  return ObjCInstanceMessage;
2141 
2142  // We have a class message, and T is the type we're
2143  // messaging. Build source-location information for it.
2144  TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2145  ReceiverType = CreateParsedType(T, TSInfo);
2146  return ObjCClassMessage;
2147  }
2148  }
2149 
2150  if (TypoCorrection Corrected = CorrectTypo(
2151  Result.getLookupNameInfo(), Result.getLookupKind(), S, nullptr,
2152  llvm::make_unique<ObjCInterfaceOrSuperCCC>(getCurMethodDecl()),
2153  CTK_ErrorRecovery, nullptr, false, nullptr, false)) {
2154  if (Corrected.isKeyword()) {
2155  // If we've found the keyword "super" (the only keyword that would be
2156  // returned by CorrectTypo), this is a send to super.
2157  diagnoseTypo(Corrected,
2158  PDiag(diag::err_unknown_receiver_suggest) << Name);
2159  return ObjCSuperMessage;
2160  } else if (ObjCInterfaceDecl *Class =
2161  Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>()) {
2162  // If we found a declaration, correct when it refers to an Objective-C
2163  // class.
2164  diagnoseTypo(Corrected,
2165  PDiag(diag::err_unknown_receiver_suggest) << Name);
2166  QualType T = Context.getObjCInterfaceType(Class);
2167  TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2168  ReceiverType = CreateParsedType(T, TSInfo);
2169  return ObjCClassMessage;
2170  }
2171  }
2172 
2173  // Fall back: let the parser try to parse it as an instance message.
2174  return ObjCInstanceMessage;
2175 }
2176 
2178  SourceLocation SuperLoc,
2179  Selector Sel,
2180  SourceLocation LBracLoc,
2181  ArrayRef<SourceLocation> SelectorLocs,
2182  SourceLocation RBracLoc,
2183  MultiExprArg Args) {
2184  // Determine whether we are inside a method or not.
2185  ObjCMethodDecl *Method = tryCaptureObjCSelf(SuperLoc);
2186  if (!Method) {
2187  Diag(SuperLoc, diag::err_invalid_receiver_to_message_super);
2188  return ExprError();
2189  }
2190 
2191  ObjCInterfaceDecl *Class = Method->getClassInterface();
2192  if (!Class) {
2193  Diag(SuperLoc, diag::err_no_super_class_message)
2194  << Method->getDeclName();
2195  return ExprError();
2196  }
2197 
2198  QualType SuperTy(Class->getSuperClassType(), 0);
2199  if (SuperTy.isNull()) {
2200  // The current class does not have a superclass.
2201  Diag(SuperLoc, diag::err_root_class_cannot_use_super)
2202  << Class->getIdentifier();
2203  return ExprError();
2204  }
2205 
2206  // We are in a method whose class has a superclass, so 'super'
2207  // is acting as a keyword.
2208  if (Method->getSelector() == Sel)
2209  getCurFunction()->ObjCShouldCallSuper = false;
2210 
2211  if (Method->isInstanceMethod()) {
2212  // Since we are in an instance method, this is an instance
2213  // message to the superclass instance.
2214  SuperTy = Context.getObjCObjectPointerType(SuperTy);
2215  return BuildInstanceMessage(nullptr, SuperTy, SuperLoc,
2216  Sel, /*Method=*/nullptr,
2217  LBracLoc, SelectorLocs, RBracLoc, Args);
2218  }
2219 
2220  // Since we are in a class method, this is a class message to
2221  // the superclass.
2222  return BuildClassMessage(/*ReceiverTypeInfo=*/nullptr,
2223  SuperTy,
2224  SuperLoc, Sel, /*Method=*/nullptr,
2225  LBracLoc, SelectorLocs, RBracLoc, Args);
2226 }
2227 
2229  bool isSuperReceiver,
2230  SourceLocation Loc,
2231  Selector Sel,
2232  ObjCMethodDecl *Method,
2233  MultiExprArg Args) {
2234  TypeSourceInfo *receiverTypeInfo = nullptr;
2235  if (!ReceiverType.isNull())
2236  receiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType);
2237 
2238  return BuildClassMessage(receiverTypeInfo, ReceiverType,
2239  /*SuperLoc=*/isSuperReceiver ? Loc : SourceLocation(),
2240  Sel, Method, Loc, Loc, Loc, Args,
2241  /*isImplicit=*/true);
2242 }
2243 
2244 static void applyCocoaAPICheck(Sema &S, const ObjCMessageExpr *Msg,
2245  unsigned DiagID,
2246  bool (*refactor)(const ObjCMessageExpr *,
2247  const NSAPI &, edit::Commit &)) {
2248  SourceLocation MsgLoc = Msg->getExprLoc();
2249  if (S.Diags.isIgnored(DiagID, MsgLoc))
2250  return;
2251 
2252  SourceManager &SM = S.SourceMgr;
2253  edit::Commit ECommit(SM, S.LangOpts);
2254  if (refactor(Msg,*S.NSAPIObj, ECommit)) {
2255  DiagnosticBuilder Builder = S.Diag(MsgLoc, DiagID)
2256  << Msg->getSelector() << Msg->getSourceRange();
2257  // FIXME: Don't emit diagnostic at all if fixits are non-commitable.
2258  if (!ECommit.isCommitable())
2259  return;
2261  I = ECommit.edit_begin(), E = ECommit.edit_end(); I != E; ++I) {
2262  const edit::Commit::Edit &Edit = *I;
2263  switch (Edit.Kind) {
2266  Edit.Text,
2267  Edit.BeforePrev));
2268  break;
2270  Builder.AddFixItHint(
2272  Edit.getInsertFromRange(SM),
2273  Edit.BeforePrev));
2274  break;
2277  break;
2278  }
2279  }
2280  }
2281 }
2282 
2283 static void checkCocoaAPI(Sema &S, const ObjCMessageExpr *Msg) {
2284  applyCocoaAPICheck(S, Msg, diag::warn_objc_redundant_literal_use,
2286 }
2287 
2289  const ObjCMethodDecl *Method,
2290  ArrayRef<Expr *> Args, QualType ReceiverType,
2291  bool IsClassObjectCall) {
2292  // Check if this is a performSelector method that uses a selector that returns
2293  // a record or a vector type.
2294  if (Method->getSelector().getMethodFamily() != OMF_performSelector ||
2295  Args.empty())
2296  return;
2297  const auto *SE = dyn_cast<ObjCSelectorExpr>(Args[0]->IgnoreParens());
2298  if (!SE)
2299  return;
2300  ObjCMethodDecl *ImpliedMethod;
2301  if (!IsClassObjectCall) {
2302  const auto *OPT = ReceiverType->getAs<ObjCObjectPointerType>();
2303  if (!OPT || !OPT->getInterfaceDecl())
2304  return;
2305  ImpliedMethod =
2306  OPT->getInterfaceDecl()->lookupInstanceMethod(SE->getSelector());
2307  if (!ImpliedMethod)
2308  ImpliedMethod =
2309  OPT->getInterfaceDecl()->lookupPrivateMethod(SE->getSelector());
2310  } else {
2311  const auto *IT = ReceiverType->getAs<ObjCInterfaceType>();
2312  if (!IT)
2313  return;
2314  ImpliedMethod = IT->getDecl()->lookupClassMethod(SE->getSelector());
2315  if (!ImpliedMethod)
2316  ImpliedMethod =
2317  IT->getDecl()->lookupPrivateClassMethod(SE->getSelector());
2318  }
2319  if (!ImpliedMethod)
2320  return;
2321  QualType Ret = ImpliedMethod->getReturnType();
2322  if (Ret->isRecordType() || Ret->isVectorType() || Ret->isExtVectorType()) {
2323  QualType Ret = ImpliedMethod->getReturnType();
2324  S.Diag(Loc, diag::warn_objc_unsafe_perform_selector)
2325  << Method->getSelector()
2326  << (!Ret->isRecordType()
2327  ? /*Vector*/ 2
2328  : Ret->isUnionType() ? /*Union*/ 1 : /*Struct*/ 0);
2329  S.Diag(ImpliedMethod->getBeginLoc(),
2330  diag::note_objc_unsafe_perform_selector_method_declared_here)
2331  << ImpliedMethod->getSelector() << Ret;
2332  }
2333 }
2334 
2335 /// Diagnose use of %s directive in an NSString which is being passed
2336 /// as formatting string to formatting method.
2337 static void
2339  ObjCMethodDecl *Method,
2340  Selector Sel,
2341  Expr **Args, unsigned NumArgs) {
2342  unsigned Idx = 0;
2343  bool Format = false;
2345  if (SFFamily == ObjCStringFormatFamily::SFF_NSString) {
2346  Idx = 0;
2347  Format = true;
2348  }
2349  else if (Method) {
2350  for (const auto *I : Method->specific_attrs<FormatAttr>()) {
2351  if (S.GetFormatNSStringIdx(I, Idx)) {
2352  Format = true;
2353  break;
2354  }
2355  }
2356  }
2357  if (!Format || NumArgs <= Idx)
2358  return;
2359 
2360  Expr *FormatExpr = Args[Idx];
2361  if (ObjCStringLiteral *OSL =
2362  dyn_cast<ObjCStringLiteral>(FormatExpr->IgnoreParenImpCasts())) {
2363  StringLiteral *FormatString = OSL->getString();
2364  if (S.FormatStringHasSArg(FormatString)) {
2365  S.Diag(FormatExpr->getExprLoc(), diag::warn_objc_cdirective_format_string)
2366  << "%s" << 0 << 0;
2367  if (Method)
2368  S.Diag(Method->getLocation(), diag::note_method_declared_at)
2369  << Method->getDeclName();
2370  }
2371  }
2372 }
2373 
2374 /// Build an Objective-C class message expression.
2375 ///
2376 /// This routine takes care of both normal class messages and
2377 /// class messages to the superclass.
2378 ///
2379 /// \param ReceiverTypeInfo Type source information that describes the
2380 /// receiver of this message. This may be NULL, in which case we are
2381 /// sending to the superclass and \p SuperLoc must be a valid source
2382 /// location.
2383 
2384 /// \param ReceiverType The type of the object receiving the
2385 /// message. When \p ReceiverTypeInfo is non-NULL, this is the same
2386 /// type as that refers to. For a superclass send, this is the type of
2387 /// the superclass.
2388 ///
2389 /// \param SuperLoc The location of the "super" keyword in a
2390 /// superclass message.
2391 ///
2392 /// \param Sel The selector to which the message is being sent.
2393 ///
2394 /// \param Method The method that this class message is invoking, if
2395 /// already known.
2396 ///
2397 /// \param LBracLoc The location of the opening square bracket ']'.
2398 ///
2399 /// \param RBracLoc The location of the closing square bracket ']'.
2400 ///
2401 /// \param ArgsIn The message arguments.
2403  QualType ReceiverType,
2404  SourceLocation SuperLoc,
2405  Selector Sel,
2406  ObjCMethodDecl *Method,
2407  SourceLocation LBracLoc,
2408  ArrayRef<SourceLocation> SelectorLocs,
2409  SourceLocation RBracLoc,
2410  MultiExprArg ArgsIn,
2411  bool isImplicit) {
2412  SourceLocation Loc = SuperLoc.isValid()? SuperLoc
2413  : ReceiverTypeInfo->getTypeLoc().getSourceRange().getBegin();
2414  if (LBracLoc.isInvalid()) {
2415  Diag(Loc, diag::err_missing_open_square_message_send)
2416  << FixItHint::CreateInsertion(Loc, "[");
2417  LBracLoc = Loc;
2418  }
2419  ArrayRef<SourceLocation> SelectorSlotLocs;
2420  if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2421  SelectorSlotLocs = SelectorLocs;
2422  else
2423  SelectorSlotLocs = Loc;
2424  SourceLocation SelLoc = SelectorSlotLocs.front();
2425 
2426  if (ReceiverType->isDependentType()) {
2427  // If the receiver type is dependent, we can't type-check anything
2428  // at this point. Build a dependent expression.
2429  unsigned NumArgs = ArgsIn.size();
2430  Expr **Args = ArgsIn.data();
2431  assert(SuperLoc.isInvalid() && "Message to super with dependent type");
2432  return ObjCMessageExpr::Create(
2433  Context, ReceiverType, VK_RValue, LBracLoc, ReceiverTypeInfo, Sel,
2434  SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs), RBracLoc,
2435  isImplicit);
2436  }
2437 
2438  // Find the class to which we are sending this message.
2439  ObjCInterfaceDecl *Class = nullptr;
2440  const ObjCObjectType *ClassType = ReceiverType->getAs<ObjCObjectType>();
2441  if (!ClassType || !(Class = ClassType->getInterface())) {
2442  Diag(Loc, diag::err_invalid_receiver_class_message)
2443  << ReceiverType;
2444  return ExprError();
2445  }
2446  assert(Class && "We don't know which class we're messaging?");
2447  // objc++ diagnoses during typename annotation.
2448  if (!getLangOpts().CPlusPlus)
2449  (void)DiagnoseUseOfDecl(Class, SelectorSlotLocs);
2450  // Find the method we are messaging.
2451  if (!Method) {
2452  SourceRange TypeRange
2453  = SuperLoc.isValid()? SourceRange(SuperLoc)
2454  : ReceiverTypeInfo->getTypeLoc().getSourceRange();
2455  if (RequireCompleteType(Loc, Context.getObjCInterfaceType(Class),
2456  (getLangOpts().ObjCAutoRefCount
2457  ? diag::err_arc_receiver_forward_class
2458  : diag::warn_receiver_forward_class),
2459  TypeRange)) {
2460  // A forward class used in messaging is treated as a 'Class'
2461  Method = LookupFactoryMethodInGlobalPool(Sel,
2462  SourceRange(LBracLoc, RBracLoc));
2463  if (Method && !getLangOpts().ObjCAutoRefCount)
2464  Diag(Method->getLocation(), diag::note_method_sent_forward_class)
2465  << Method->getDeclName();
2466  }
2467  if (!Method)
2468  Method = Class->lookupClassMethod(Sel);
2469 
2470  // If we have an implementation in scope, check "private" methods.
2471  if (!Method)
2472  Method = Class->lookupPrivateClassMethod(Sel);
2473 
2474  if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs,
2475  nullptr, false, false, Class))
2476  return ExprError();
2477  }
2478 
2479  // Check the argument types and determine the result type.
2480  QualType ReturnType;
2481  ExprValueKind VK = VK_RValue;
2482 
2483  unsigned NumArgs = ArgsIn.size();
2484  Expr **Args = ArgsIn.data();
2485  if (CheckMessageArgumentTypes(ReceiverType, MultiExprArg(Args, NumArgs),
2486  Sel, SelectorLocs,
2487  Method, true,
2488  SuperLoc.isValid(), LBracLoc, RBracLoc,
2489  SourceRange(),
2490  ReturnType, VK))
2491  return ExprError();
2492 
2493  if (Method && !Method->getReturnType()->isVoidType() &&
2494  RequireCompleteType(LBracLoc, Method->getReturnType(),
2495  diag::err_illegal_message_expr_incomplete_type))
2496  return ExprError();
2497 
2498  // Warn about explicit call of +initialize on its own class. But not on 'super'.
2499  if (Method && Method->getMethodFamily() == OMF_initialize) {
2500  if (!SuperLoc.isValid()) {
2501  const ObjCInterfaceDecl *ID =
2502  dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext());
2503  if (ID == Class) {
2504  Diag(Loc, diag::warn_direct_initialize_call);
2505  Diag(Method->getLocation(), diag::note_method_declared_at)
2506  << Method->getDeclName();
2507  }
2508  }
2509  else if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2510  // [super initialize] is allowed only within an +initialize implementation
2511  if (CurMeth->getMethodFamily() != OMF_initialize) {
2512  Diag(Loc, diag::warn_direct_super_initialize_call);
2513  Diag(Method->getLocation(), diag::note_method_declared_at)
2514  << Method->getDeclName();
2515  Diag(CurMeth->getLocation(), diag::note_method_declared_at)
2516  << CurMeth->getDeclName();
2517  }
2518  }
2519  }
2520 
2521  DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
2522 
2523  // Construct the appropriate ObjCMessageExpr.
2524  ObjCMessageExpr *Result;
2525  if (SuperLoc.isValid())
2526  Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2527  SuperLoc, /*IsInstanceSuper=*/false,
2528  ReceiverType, Sel, SelectorLocs,
2529  Method, makeArrayRef(Args, NumArgs),
2530  RBracLoc, isImplicit);
2531  else {
2532  Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2533  ReceiverTypeInfo, Sel, SelectorLocs,
2534  Method, makeArrayRef(Args, NumArgs),
2535  RBracLoc, isImplicit);
2536  if (!isImplicit)
2537  checkCocoaAPI(*this, Result);
2538  }
2539  if (Method)
2540  checkFoundationAPI(*this, SelLoc, Method, makeArrayRef(Args, NumArgs),
2541  ReceiverType, /*IsClassObjectCall=*/true);
2542  return MaybeBindToTemporary(Result);
2543 }
2544 
2545 // ActOnClassMessage - used for both unary and keyword messages.
2546 // ArgExprs is optional - if it is present, the number of expressions
2547 // is obtained from Sel.getNumArgs().
2549  ParsedType Receiver,
2550  Selector Sel,
2551  SourceLocation LBracLoc,
2552  ArrayRef<SourceLocation> SelectorLocs,
2553  SourceLocation RBracLoc,
2554  MultiExprArg Args) {
2555  TypeSourceInfo *ReceiverTypeInfo;
2556  QualType ReceiverType = GetTypeFromParser(Receiver, &ReceiverTypeInfo);
2557  if (ReceiverType.isNull())
2558  return ExprError();
2559 
2560  if (!ReceiverTypeInfo)
2561  ReceiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType, LBracLoc);
2562 
2563  return BuildClassMessage(ReceiverTypeInfo, ReceiverType,
2564  /*SuperLoc=*/SourceLocation(), Sel,
2565  /*Method=*/nullptr, LBracLoc, SelectorLocs, RBracLoc,
2566  Args);
2567 }
2568 
2570  QualType ReceiverType,
2571  SourceLocation Loc,
2572  Selector Sel,
2573  ObjCMethodDecl *Method,
2574  MultiExprArg Args) {
2575  return BuildInstanceMessage(Receiver, ReceiverType,
2576  /*SuperLoc=*/!Receiver ? Loc : SourceLocation(),
2577  Sel, Method, Loc, Loc, Loc, Args,
2578  /*isImplicit=*/true);
2579 }
2580 
2582  if (!S.NSAPIObj)
2583  return false;
2584  const auto *Protocol = dyn_cast<ObjCProtocolDecl>(M->getDeclContext());
2585  if (!Protocol)
2586  return false;
2587  const IdentifierInfo *II = S.NSAPIObj->getNSClassId(NSAPI::ClassId_NSObject);
2588  if (const auto *RootClass = dyn_cast_or_null<ObjCInterfaceDecl>(
2589  S.LookupSingleName(S.TUScope, II, Protocol->getBeginLoc(),
2591  for (const ObjCProtocolDecl *P : RootClass->all_referenced_protocols()) {
2592  if (P->getCanonicalDecl() == Protocol->getCanonicalDecl())
2593  return true;
2594  }
2595  }
2596  return false;
2597 }
2598 
2599 /// Build an Objective-C instance message expression.
2600 ///
2601 /// This routine takes care of both normal instance messages and
2602 /// instance messages to the superclass instance.
2603 ///
2604 /// \param Receiver The expression that computes the object that will
2605 /// receive this message. This may be empty, in which case we are
2606 /// sending to the superclass instance and \p SuperLoc must be a valid
2607 /// source location.
2608 ///
2609 /// \param ReceiverType The (static) type of the object receiving the
2610 /// message. When a \p Receiver expression is provided, this is the
2611 /// same type as that expression. For a superclass instance send, this
2612 /// is a pointer to the type of the superclass.
2613 ///
2614 /// \param SuperLoc The location of the "super" keyword in a
2615 /// superclass instance message.
2616 ///
2617 /// \param Sel The selector to which the message is being sent.
2618 ///
2619 /// \param Method The method that this instance message is invoking, if
2620 /// already known.
2621 ///
2622 /// \param LBracLoc The location of the opening square bracket ']'.
2623 ///
2624 /// \param RBracLoc The location of the closing square bracket ']'.
2625 ///
2626 /// \param ArgsIn The message arguments.
2628  QualType ReceiverType,
2629  SourceLocation SuperLoc,
2630  Selector Sel,
2631  ObjCMethodDecl *Method,
2632  SourceLocation LBracLoc,
2633  ArrayRef<SourceLocation> SelectorLocs,
2634  SourceLocation RBracLoc,
2635  MultiExprArg ArgsIn,
2636  bool isImplicit) {
2637  assert((Receiver || SuperLoc.isValid()) && "If the Receiver is null, the "
2638  "SuperLoc must be valid so we can "
2639  "use it instead.");
2640 
2641  // The location of the receiver.
2642  SourceLocation Loc = SuperLoc.isValid() ? SuperLoc : Receiver->getBeginLoc();
2643  SourceRange RecRange =
2644  SuperLoc.isValid()? SuperLoc : Receiver->getSourceRange();
2645  ArrayRef<SourceLocation> SelectorSlotLocs;
2646  if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2647  SelectorSlotLocs = SelectorLocs;
2648  else
2649  SelectorSlotLocs = Loc;
2650  SourceLocation SelLoc = SelectorSlotLocs.front();
2651 
2652  if (LBracLoc.isInvalid()) {
2653  Diag(Loc, diag::err_missing_open_square_message_send)
2654  << FixItHint::CreateInsertion(Loc, "[");
2655  LBracLoc = Loc;
2656  }
2657 
2658  // If we have a receiver expression, perform appropriate promotions
2659  // and determine receiver type.
2660  if (Receiver) {
2661  if (Receiver->hasPlaceholderType()) {
2662  ExprResult Result;
2663  if (Receiver->getType() == Context.UnknownAnyTy)
2664  Result = forceUnknownAnyToType(Receiver, Context.getObjCIdType());
2665  else
2666  Result = CheckPlaceholderExpr(Receiver);
2667  if (Result.isInvalid()) return ExprError();
2668  Receiver = Result.get();
2669  }
2670 
2671  if (Receiver->isTypeDependent()) {
2672  // If the receiver is type-dependent, we can't type-check anything
2673  // at this point. Build a dependent expression.
2674  unsigned NumArgs = ArgsIn.size();
2675  Expr **Args = ArgsIn.data();
2676  assert(SuperLoc.isInvalid() && "Message to super with dependent type");
2677  return ObjCMessageExpr::Create(
2678  Context, Context.DependentTy, VK_RValue, LBracLoc, Receiver, Sel,
2679  SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs),
2680  RBracLoc, isImplicit);
2681  }
2682 
2683  // If necessary, apply function/array conversion to the receiver.
2684  // C99 6.7.5.3p[7,8].
2685  ExprResult Result = DefaultFunctionArrayLvalueConversion(Receiver);
2686  if (Result.isInvalid())
2687  return ExprError();
2688  Receiver = Result.get();
2689  ReceiverType = Receiver->getType();
2690 
2691  // If the receiver is an ObjC pointer, a block pointer, or an
2692  // __attribute__((NSObject)) pointer, we don't need to do any
2693  // special conversion in order to look up a receiver.
2694  if (ReceiverType->isObjCRetainableType()) {
2695  // do nothing
2696  } else if (!getLangOpts().ObjCAutoRefCount &&
2697  !Context.getObjCIdType().isNull() &&
2698  (ReceiverType->isPointerType() ||
2699  ReceiverType->isIntegerType())) {
2700  // Implicitly convert integers and pointers to 'id' but emit a warning.
2701  // But not in ARC.
2702  Diag(Loc, diag::warn_bad_receiver_type)
2703  << ReceiverType
2704  << Receiver->getSourceRange();
2705  if (ReceiverType->isPointerType()) {
2706  Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2707  CK_CPointerToObjCPointerCast).get();
2708  } else {
2709  // TODO: specialized warning on null receivers?
2710  bool IsNull = Receiver->isNullPointerConstant(Context,
2712  CastKind Kind = IsNull ? CK_NullToPointer : CK_IntegralToPointer;
2713  Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2714  Kind).get();
2715  }
2716  ReceiverType = Receiver->getType();
2717  } else if (getLangOpts().CPlusPlus) {
2718  // The receiver must be a complete type.
2719  if (RequireCompleteType(Loc, Receiver->getType(),
2720  diag::err_incomplete_receiver_type))
2721  return ExprError();
2722 
2723  ExprResult result = PerformContextuallyConvertToObjCPointer(Receiver);
2724  if (result.isUsable()) {
2725  Receiver = result.get();
2726  ReceiverType = Receiver->getType();
2727  }
2728  }
2729  }
2730 
2731  if (ReceiverType->isObjCIdType() && !isImplicit)
2732  Diag(Receiver->getExprLoc(), diag::warn_messaging_unqualified_id);
2733 
2734  // There's a somewhat weird interaction here where we assume that we
2735  // won't actually have a method unless we also don't need to do some
2736  // of the more detailed type-checking on the receiver.
2737 
2738  if (!Method) {
2739  // Handle messages to id and __kindof types (where we use the
2740  // global method pool).
2741  const ObjCObjectType *typeBound = nullptr;
2742  bool receiverIsIdLike = ReceiverType->isObjCIdOrObjectKindOfType(Context,
2743  typeBound);
2744  if (receiverIsIdLike || ReceiverType->isBlockPointerType() ||
2745  (Receiver && Context.isObjCNSObjectType(Receiver->getType()))) {
2747  // If we have a type bound, further filter the methods.
2748  CollectMultipleMethodsInGlobalPool(Sel, Methods, true/*InstanceFirst*/,
2749  true/*CheckTheOther*/, typeBound);
2750  if (!Methods.empty()) {
2751  // We choose the first method as the initial candidate, then try to
2752  // select a better one.
2753  Method = Methods[0];
2754 
2755  if (ObjCMethodDecl *BestMethod =
2756  SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(), Methods))
2757  Method = BestMethod;
2758 
2759  if (!AreMultipleMethodsInGlobalPool(Sel, Method,
2760  SourceRange(LBracLoc, RBracLoc),
2761  receiverIsIdLike, Methods))
2762  DiagnoseUseOfDecl(Method, SelectorSlotLocs);
2763  }
2764  } else if (ReceiverType->isObjCClassOrClassKindOfType() ||
2765  ReceiverType->isObjCQualifiedClassType()) {
2766  // Handle messages to Class.
2767  // We allow sending a message to a qualified Class ("Class<foo>"), which
2768  // is ok as long as one of the protocols implements the selector (if not,
2769  // warn).
2770  if (!ReceiverType->isObjCClassOrClassKindOfType()) {
2771  const ObjCObjectPointerType *QClassTy
2772  = ReceiverType->getAsObjCQualifiedClassType();
2773  // Search protocols for class methods.
2774  Method = LookupMethodInQualifiedType(Sel, QClassTy, false);
2775  if (!Method) {
2776  Method = LookupMethodInQualifiedType(Sel, QClassTy, true);
2777  // warn if instance method found for a Class message.
2778  if (Method && !isMethodDeclaredInRootProtocol(*this, Method)) {
2779  Diag(SelLoc, diag::warn_instance_method_on_class_found)
2780  << Method->getSelector() << Sel;
2781  Diag(Method->getLocation(), diag::note_method_declared_at)
2782  << Method->getDeclName();
2783  }
2784  }
2785  } else {
2786  if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2787  if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) {
2788  // FIXME: Is this correct? Why are we assuming that a message to
2789  // Class will call a method in the current interface?
2790 
2791  // First check the public methods in the class interface.
2792  Method = ClassDecl->lookupClassMethod(Sel);
2793 
2794  if (!Method)
2795  Method = ClassDecl->lookupPrivateClassMethod(Sel);
2796 
2797  if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs, nullptr,
2798  false, false, ClassDecl))
2799  return ExprError();
2800  }
2801  }
2802  if (!Method) {
2803  // If not messaging 'self', look for any factory method named 'Sel'.
2804  if (!Receiver || !isSelfExpr(Receiver)) {
2805  // If no class (factory) method was found, check if an _instance_
2806  // method of the same name exists in the root class only.
2808  CollectMultipleMethodsInGlobalPool(Sel, Methods,
2809  false/*InstanceFirst*/,
2810  true/*CheckTheOther*/);
2811  if (!Methods.empty()) {
2812  // We choose the first method as the initial candidate, then try
2813  // to select a better one.
2814  Method = Methods[0];
2815 
2816  // If we find an instance method, emit warning.
2817  if (Method->isInstanceMethod()) {
2818  if (const ObjCInterfaceDecl *ID =
2819  dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext())) {
2820  if (ID->getSuperClass())
2821  Diag(SelLoc, diag::warn_root_inst_method_not_found)
2822  << Sel << SourceRange(LBracLoc, RBracLoc);
2823  }
2824  }
2825 
2826  if (ObjCMethodDecl *BestMethod =
2827  SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(),
2828  Methods))
2829  Method = BestMethod;
2830  }
2831  }
2832  }
2833  }
2834  } else {
2835  ObjCInterfaceDecl *ClassDecl = nullptr;
2836 
2837  // We allow sending a message to a qualified ID ("id<foo>"), which is ok as
2838  // long as one of the protocols implements the selector (if not, warn).
2839  // And as long as message is not deprecated/unavailable (warn if it is).
2840  if (const ObjCObjectPointerType *QIdTy
2841  = ReceiverType->getAsObjCQualifiedIdType()) {
2842  // Search protocols for instance methods.
2843  Method = LookupMethodInQualifiedType(Sel, QIdTy, true);
2844  if (!Method)
2845  Method = LookupMethodInQualifiedType(Sel, QIdTy, false);
2846  if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs))
2847  return ExprError();
2848  } else if (const ObjCObjectPointerType *OCIType
2849  = ReceiverType->getAsObjCInterfacePointerType()) {
2850  // We allow sending a message to a pointer to an interface (an object).
2851  ClassDecl = OCIType->getInterfaceDecl();
2852 
2853  // Try to complete the type. Under ARC, this is a hard error from which
2854  // we don't try to recover.
2855  // FIXME: In the non-ARC case, this will still be a hard error if the
2856  // definition is found in a module that's not visible.
2857  const ObjCInterfaceDecl *forwardClass = nullptr;
2858  if (RequireCompleteType(Loc, OCIType->getPointeeType(),
2859  getLangOpts().ObjCAutoRefCount
2860  ? diag::err_arc_receiver_forward_instance
2861  : diag::warn_receiver_forward_instance,
2862  Receiver? Receiver->getSourceRange()
2863  : SourceRange(SuperLoc))) {
2864  if (getLangOpts().ObjCAutoRefCount)
2865  return ExprError();
2866 
2867  forwardClass = OCIType->getInterfaceDecl();
2868  Diag(Receiver ? Receiver->getBeginLoc() : SuperLoc,
2869  diag::note_receiver_is_id);
2870  Method = nullptr;
2871  } else {
2872  Method = ClassDecl->lookupInstanceMethod(Sel);
2873  }
2874 
2875  if (!Method)
2876  // Search protocol qualifiers.
2877  Method = LookupMethodInQualifiedType(Sel, OCIType, true);
2878 
2879  if (!Method) {
2880  // If we have implementations in scope, check "private" methods.
2881  Method = ClassDecl->lookupPrivateMethod(Sel);
2882 
2883  if (!Method && getLangOpts().ObjCAutoRefCount) {
2884  Diag(SelLoc, diag::err_arc_may_not_respond)
2885  << OCIType->getPointeeType() << Sel << RecRange
2886  << SourceRange(SelectorLocs.front(), SelectorLocs.back());
2887  return ExprError();
2888  }
2889 
2890  if (!Method && (!Receiver || !isSelfExpr(Receiver))) {
2891  // If we still haven't found a method, look in the global pool. This
2892  // behavior isn't very desirable, however we need it for GCC
2893  // compatibility. FIXME: should we deviate??
2894  if (OCIType->qual_empty()) {
2896  CollectMultipleMethodsInGlobalPool(Sel, Methods,
2897  true/*InstanceFirst*/,
2898  false/*CheckTheOther*/);
2899  if (!Methods.empty()) {
2900  // We choose the first method as the initial candidate, then try
2901  // to select a better one.
2902  Method = Methods[0];
2903 
2904  if (ObjCMethodDecl *BestMethod =
2905  SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(),
2906  Methods))
2907  Method = BestMethod;
2908 
2909  AreMultipleMethodsInGlobalPool(Sel, Method,
2910  SourceRange(LBracLoc, RBracLoc),
2911  true/*receiverIdOrClass*/,
2912  Methods);
2913  }
2914  if (Method && !forwardClass)
2915  Diag(SelLoc, diag::warn_maynot_respond)
2916  << OCIType->getInterfaceDecl()->getIdentifier()
2917  << Sel << RecRange;
2918  }
2919  }
2920  }
2921  if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs, forwardClass))
2922  return ExprError();
2923  } else {
2924  // Reject other random receiver types (e.g. structs).
2925  Diag(Loc, diag::err_bad_receiver_type)
2926  << ReceiverType << Receiver->getSourceRange();
2927  return ExprError();
2928  }
2929  }
2930  }
2931 
2932  FunctionScopeInfo *DIFunctionScopeInfo =
2933  (Method && Method->getMethodFamily() == OMF_init)
2934  ? getEnclosingFunction() : nullptr;
2935 
2936  if (DIFunctionScopeInfo &&
2937  DIFunctionScopeInfo->ObjCIsDesignatedInit &&
2938  (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2939  bool isDesignatedInitChain = false;
2940  if (SuperLoc.isValid()) {
2941  if (const ObjCObjectPointerType *
2942  OCIType = ReceiverType->getAsObjCInterfacePointerType()) {
2943  if (const ObjCInterfaceDecl *ID = OCIType->getInterfaceDecl()) {
2944  // Either we know this is a designated initializer or we
2945  // conservatively assume it because we don't know for sure.
2946  if (!ID->declaresOrInheritsDesignatedInitializers() ||
2947  ID->isDesignatedInitializer(Sel)) {
2948  isDesignatedInitChain = true;
2949  DIFunctionScopeInfo->ObjCWarnForNoDesignatedInitChain = false;
2950  }
2951  }
2952  }
2953  }
2954  if (!isDesignatedInitChain) {
2955  const ObjCMethodDecl *InitMethod = nullptr;
2956  bool isDesignated =
2957  getCurMethodDecl()->isDesignatedInitializerForTheInterface(&InitMethod);
2958  assert(isDesignated && InitMethod);
2959  (void)isDesignated;
2960  Diag(SelLoc, SuperLoc.isValid() ?
2961  diag::warn_objc_designated_init_non_designated_init_call :
2962  diag::warn_objc_designated_init_non_super_designated_init_call);
2963  Diag(InitMethod->getLocation(),
2964  diag::note_objc_designated_init_marked_here);
2965  }
2966  }
2967 
2968  if (DIFunctionScopeInfo &&
2969  DIFunctionScopeInfo->ObjCIsSecondaryInit &&
2970  (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2971  if (SuperLoc.isValid()) {
2972  Diag(SelLoc, diag::warn_objc_secondary_init_super_init_call);
2973  } else {
2974  DIFunctionScopeInfo->ObjCWarnForNoInitDelegation = false;
2975  }
2976  }
2977 
2978  // Check the message arguments.
2979  unsigned NumArgs = ArgsIn.size();
2980  Expr **Args = ArgsIn.data();
2981  QualType ReturnType;
2982  ExprValueKind VK = VK_RValue;
2983  bool ClassMessage = (ReceiverType->isObjCClassType() ||
2984  ReceiverType->isObjCQualifiedClassType());
2985  if (CheckMessageArgumentTypes(ReceiverType, MultiExprArg(Args, NumArgs),
2986  Sel, SelectorLocs, Method,
2987  ClassMessage, SuperLoc.isValid(),
2988  LBracLoc, RBracLoc, RecRange, ReturnType, VK))
2989  return ExprError();
2990 
2991  if (Method && !Method->getReturnType()->isVoidType() &&
2992  RequireCompleteType(LBracLoc, Method->getReturnType(),
2993  diag::err_illegal_message_expr_incomplete_type))
2994  return ExprError();
2995 
2996  // In ARC, forbid the user from sending messages to
2997  // retain/release/autorelease/dealloc/retainCount explicitly.
2998  if (getLangOpts().ObjCAutoRefCount) {
2999  ObjCMethodFamily family =
3000  (Method ? Method->getMethodFamily() : Sel.getMethodFamily());
3001  switch (family) {
3002  case OMF_init:
3003  if (Method)
3004  checkInitMethod(Method, ReceiverType);
3005  break;
3006 
3007  case OMF_None:
3008  case OMF_alloc:
3009  case OMF_copy:
3010  case OMF_finalize:
3011  case OMF_mutableCopy:
3012  case OMF_new:
3013  case OMF_self:
3014  case OMF_initialize:
3015  break;
3016 
3017  case OMF_dealloc:
3018  case OMF_retain:
3019  case OMF_release:
3020  case OMF_autorelease:
3021  case OMF_retainCount:
3022  Diag(SelLoc, diag::err_arc_illegal_explicit_message)
3023  << Sel << RecRange;
3024  break;
3025 
3026  case OMF_performSelector:
3027  if (Method && NumArgs >= 1) {
3028  if (const auto *SelExp =
3029  dyn_cast<ObjCSelectorExpr>(Args[0]->IgnoreParens())) {
3030  Selector ArgSel = SelExp->getSelector();
3031  ObjCMethodDecl *SelMethod =
3032  LookupInstanceMethodInGlobalPool(ArgSel,
3033  SelExp->getSourceRange());
3034  if (!SelMethod)
3035  SelMethod =
3036  LookupFactoryMethodInGlobalPool(ArgSel,
3037  SelExp->getSourceRange());
3038  if (SelMethod) {
3039  ObjCMethodFamily SelFamily = SelMethod->getMethodFamily();
3040  switch (SelFamily) {
3041  case OMF_alloc:
3042  case OMF_copy:
3043  case OMF_mutableCopy:
3044  case OMF_new:
3045  case OMF_init:
3046  // Issue error, unless ns_returns_not_retained.
3047  if (!SelMethod->hasAttr<NSReturnsNotRetainedAttr>()) {
3048  // selector names a +1 method
3049  Diag(SelLoc,
3050  diag::err_arc_perform_selector_retains);
3051  Diag(SelMethod->getLocation(), diag::note_method_declared_at)
3052  << SelMethod->getDeclName();
3053  }
3054  break;
3055  default:
3056  // +0 call. OK. unless ns_returns_retained.
3057  if (SelMethod->hasAttr<NSReturnsRetainedAttr>()) {
3058  // selector names a +1 method
3059  Diag(SelLoc,
3060  diag::err_arc_perform_selector_retains);
3061  Diag(SelMethod->getLocation(), diag::note_method_declared_at)
3062  << SelMethod->getDeclName();
3063  }
3064  break;
3065  }
3066  }
3067  } else {
3068  // error (may leak).
3069  Diag(SelLoc, diag::warn_arc_perform_selector_leaks);
3070  Diag(Args[0]->getExprLoc(), diag::note_used_here);
3071  }
3072  }
3073  break;
3074  }
3075  }
3076 
3077  DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
3078 
3079  // Construct the appropriate ObjCMessageExpr instance.
3080  ObjCMessageExpr *Result;
3081  if (SuperLoc.isValid())
3082  Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
3083  SuperLoc, /*IsInstanceSuper=*/true,
3084  ReceiverType, Sel, SelectorLocs, Method,
3085  makeArrayRef(Args, NumArgs), RBracLoc,
3086  isImplicit);
3087  else {
3088  Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
3089  Receiver, Sel, SelectorLocs, Method,
3090  makeArrayRef(Args, NumArgs), RBracLoc,
3091  isImplicit);
3092  if (!isImplicit)
3093  checkCocoaAPI(*this, Result);
3094  }
3095  if (Method) {
3096  bool IsClassObjectCall = ClassMessage;
3097  // 'self' message receivers in class methods should be treated as message
3098  // sends to the class object in order for the semantic checks to be
3099  // performed correctly. Messages to 'super' already count as class messages,
3100  // so they don't need to be handled here.
3101  if (Receiver && isSelfExpr(Receiver)) {
3102  if (const auto *OPT = ReceiverType->getAs<ObjCObjectPointerType>()) {
3103  if (OPT->getObjectType()->isObjCClass()) {
3104  if (const auto *CurMeth = getCurMethodDecl()) {
3105  IsClassObjectCall = true;
3106  ReceiverType =
3107  Context.getObjCInterfaceType(CurMeth->getClassInterface());
3108  }
3109  }
3110  }
3111  }
3112  checkFoundationAPI(*this, SelLoc, Method, makeArrayRef(Args, NumArgs),
3113  ReceiverType, IsClassObjectCall);
3114  }
3115 
3116  if (getLangOpts().ObjCAutoRefCount) {
3117  // In ARC, annotate delegate init calls.
3118  if (Result->getMethodFamily() == OMF_init &&
3119  (SuperLoc.isValid() || isSelfExpr(Receiver))) {
3120  // Only consider init calls *directly* in init implementations,
3121  // not within blocks.
3122  ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(CurContext);
3123  if (method && method->getMethodFamily() == OMF_init) {
3124  // The implicit assignment to self means we also don't want to
3125  // consume the result.
3126  Result->setDelegateInitCall(true);
3127  return Result;
3128  }
3129  }
3130 
3131  // In ARC, check for message sends which are likely to introduce
3132  // retain cycles.
3133  checkRetainCycles(Result);
3134  }
3135 
3136  if (getLangOpts().ObjCWeak) {
3137  if (!isImplicit && Method) {
3138  if (const ObjCPropertyDecl *Prop = Method->findPropertyDecl()) {
3139  bool IsWeak =
3140  Prop->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak;
3141  if (!IsWeak && Sel.isUnarySelector())
3142  IsWeak = ReturnType.getObjCLifetime() & Qualifiers::OCL_Weak;
3143  if (IsWeak &&
3144  !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, LBracLoc))
3145  getCurFunction()->recordUseOfWeak(Result, Prop);
3146  }
3147  }
3148  }
3149 
3150  CheckObjCCircularContainer(Result);
3151 
3152  return MaybeBindToTemporary(Result);
3153 }
3154 
3156  if (ObjCSelectorExpr *OSE =
3157  dyn_cast<ObjCSelectorExpr>(Arg->IgnoreParenCasts())) {
3158  Selector Sel = OSE->getSelector();
3159  SourceLocation Loc = OSE->getAtLoc();
3160  auto Pos = S.ReferencedSelectors.find(Sel);
3161  if (Pos != S.ReferencedSelectors.end() && Pos->second == Loc)
3162  S.ReferencedSelectors.erase(Pos);
3163  }
3164 }
3165 
3166 // ActOnInstanceMessage - used for both unary and keyword messages.
3167 // ArgExprs is optional - if it is present, the number of expressions
3168 // is obtained from Sel.getNumArgs().
3170  Expr *Receiver,
3171  Selector Sel,
3172  SourceLocation LBracLoc,
3173  ArrayRef<SourceLocation> SelectorLocs,
3174  SourceLocation RBracLoc,
3175  MultiExprArg Args) {
3176  if (!Receiver)
3177  return ExprError();
3178 
3179  // A ParenListExpr can show up while doing error recovery with invalid code.
3180  if (isa<ParenListExpr>(Receiver)) {
3181  ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Receiver);
3182  if (Result.isInvalid()) return ExprError();
3183  Receiver = Result.get();
3184  }
3185 
3186  if (RespondsToSelectorSel.isNull()) {
3187  IdentifierInfo *SelectorId = &Context.Idents.get("respondsToSelector");
3188  RespondsToSelectorSel = Context.Selectors.getUnarySelector(SelectorId);
3189  }
3190  if (Sel == RespondsToSelectorSel)
3191  RemoveSelectorFromWarningCache(*this, Args[0]);
3192 
3193  return BuildInstanceMessage(Receiver, Receiver->getType(),
3194  /*SuperLoc=*/SourceLocation(), Sel,
3195  /*Method=*/nullptr, LBracLoc, SelectorLocs,
3196  RBracLoc, Args);
3197 }
3198 
3200  /// int, void, struct A
3202 
3203  /// id, void (^)()
3205 
3206  /// id*, id***, void (^*)(),
3208 
3209  /// void* might be a normal C type, or it might a CF type.
3211 
3212  /// struct A*
3214 };
3215 
3217  return (ACTC == ACTC_retainable ||
3218  ACTC == ACTC_coreFoundation ||
3219  ACTC == ACTC_voidPtr);
3220 }
3221 
3223  return ACTC == ACTC_none ||
3224  ACTC == ACTC_voidPtr ||
3225  ACTC == ACTC_coreFoundation;
3226 }
3227 
3229  bool isIndirect = false;
3230 
3231  // Ignore an outermost reference type.
3232  if (const ReferenceType *ref = type->getAs<ReferenceType>()) {
3233  type = ref->getPointeeType();
3234  isIndirect = true;
3235  }
3236 
3237  // Drill through pointers and arrays recursively.
3238  while (true) {
3239  if (const PointerType *ptr = type->getAs<PointerType>()) {
3240  type = ptr->getPointeeType();
3241 
3242  // The first level of pointer may be the innermost pointer on a CF type.
3243  if (!isIndirect) {
3244  if (type->isVoidType()) return ACTC_voidPtr;
3245  if (type->isRecordType()) return ACTC_coreFoundation;
3246  }
3247  } else if (const ArrayType *array = type->getAsArrayTypeUnsafe()) {
3248  type = QualType(array->getElementType()->getBaseElementTypeUnsafe(), 0);
3249  } else {
3250  break;
3251  }
3252  isIndirect = true;
3253  }
3254 
3255  if (isIndirect) {
3256  if (type->isObjCARCBridgableType())
3257  return ACTC_indirectRetainable;
3258  return ACTC_none;
3259  }
3260 
3261  if (type->isObjCARCBridgableType())
3262  return ACTC_retainable;
3263 
3264  return ACTC_none;
3265 }
3266 
3267 namespace {
3268  /// A result from the cast checker.
3269  enum ACCResult {
3270  /// Cannot be casted.
3271  ACC_invalid,
3272 
3273  /// Can be safely retained or not retained.
3274  ACC_bottom,
3275 
3276  /// Can be casted at +0.
3277  ACC_plusZero,
3278 
3279  /// Can be casted at +1.
3280  ACC_plusOne
3281  };
3282  ACCResult merge(ACCResult left, ACCResult right) {
3283  if (left == right) return left;
3284  if (left == ACC_bottom) return right;
3285  if (right == ACC_bottom) return left;
3286  return ACC_invalid;
3287  }
3288 
3289  /// A checker which white-lists certain expressions whose conversion
3290  /// to or from retainable type would otherwise be forbidden in ARC.
3291  class ARCCastChecker : public StmtVisitor<ARCCastChecker, ACCResult> {
3293 
3294  ASTContext &Context;
3295  ARCConversionTypeClass SourceClass;
3296  ARCConversionTypeClass TargetClass;
3297  bool Diagnose;
3298 
3299  static bool isCFType(QualType type) {
3300  // Someday this can use ns_bridged. For now, it has to do this.
3301  return type->isCARCBridgableType();
3302  }
3303 
3304  public:
3305  ARCCastChecker(ASTContext &Context, ARCConversionTypeClass source,
3306  ARCConversionTypeClass target, bool diagnose)
3307  : Context(Context), SourceClass(source), TargetClass(target),
3308  Diagnose(diagnose) {}
3309 
3310  using super::Visit;
3311  ACCResult Visit(Expr *e) {
3312  return super::Visit(e->IgnoreParens());
3313  }
3314 
3315  ACCResult VisitStmt(Stmt *s) {
3316  return ACC_invalid;
3317  }
3318 
3319  /// Null pointer constants can be casted however you please.
3320  ACCResult VisitExpr(Expr *e) {
3322  return ACC_bottom;
3323  return ACC_invalid;
3324  }
3325 
3326  /// Objective-C string literals can be safely casted.
3327  ACCResult VisitObjCStringLiteral(ObjCStringLiteral *e) {
3328  // If we're casting to any retainable type, go ahead. Global
3329  // strings are immune to retains, so this is bottom.
3330  if (isAnyRetainable(TargetClass)) return ACC_bottom;
3331 
3332  return ACC_invalid;
3333  }
3334 
3335  /// Look through certain implicit and explicit casts.
3336  ACCResult VisitCastExpr(CastExpr *e) {
3337  switch (e->getCastKind()) {
3338  case CK_NullToPointer:
3339  return ACC_bottom;
3340 
3341  case CK_NoOp:
3342  case CK_LValueToRValue:
3343  case CK_BitCast:
3344  case CK_CPointerToObjCPointerCast:
3345  case CK_BlockPointerToObjCPointerCast:
3346  case CK_AnyPointerToBlockPointerCast:
3347  return Visit(e->getSubExpr());
3348 
3349  default:
3350  return ACC_invalid;
3351  }
3352  }
3353 
3354  /// Look through unary extension.
3355  ACCResult VisitUnaryExtension(UnaryOperator *e) {
3356  return Visit(e->getSubExpr());
3357  }
3358 
3359  /// Ignore the LHS of a comma operator.
3360  ACCResult VisitBinComma(BinaryOperator *e) {
3361  return Visit(e->getRHS());
3362  }
3363 
3364  /// Conditional operators are okay if both sides are okay.
3365  ACCResult VisitConditionalOperator(ConditionalOperator *e) {
3366  ACCResult left = Visit(e->getTrueExpr());
3367  if (left == ACC_invalid) return ACC_invalid;
3368  return merge(left, Visit(e->getFalseExpr()));
3369  }
3370 
3371  /// Look through pseudo-objects.
3372  ACCResult VisitPseudoObjectExpr(PseudoObjectExpr *e) {
3373  // If we're getting here, we should always have a result.
3374  return Visit(e->getResultExpr());
3375  }
3376 
3377  /// Statement expressions are okay if their result expression is okay.
3378  ACCResult VisitStmtExpr(StmtExpr *e) {
3379  return Visit(e->getSubStmt()->body_back());
3380  }
3381 
3382  /// Some declaration references are okay.
3383  ACCResult VisitDeclRefExpr(DeclRefExpr *e) {
3384  VarDecl *var = dyn_cast<VarDecl>(e->getDecl());
3385  // References to global constants are okay.
3386  if (isAnyRetainable(TargetClass) &&
3387  isAnyRetainable(SourceClass) &&
3388  var &&
3389  !var->hasDefinition(Context) &&
3390  var->getType().isConstQualified()) {
3391 
3392  // In system headers, they can also be assumed to be immune to retains.
3393  // These are things like 'kCFStringTransformToLatin'.
3394  if (Context.getSourceManager().isInSystemHeader(var->getLocation()))
3395  return ACC_bottom;
3396 
3397  return ACC_plusZero;
3398  }
3399 
3400  // Nothing else.
3401  return ACC_invalid;
3402  }
3403 
3404  /// Some calls are okay.
3405  ACCResult VisitCallExpr(CallExpr *e) {
3406  if (FunctionDecl *fn = e->getDirectCallee())
3407  if (ACCResult result = checkCallToFunction(fn))
3408  return result;
3409 
3410  return super::VisitCallExpr(e);
3411  }
3412 
3413  ACCResult checkCallToFunction(FunctionDecl *fn) {
3414  // Require a CF*Ref return type.
3415  if (!isCFType(fn->getReturnType()))
3416  return ACC_invalid;
3417 
3418  if (!isAnyRetainable(TargetClass))
3419  return ACC_invalid;
3420 
3421  // Honor an explicit 'not retained' attribute.
3422  if (fn->hasAttr<CFReturnsNotRetainedAttr>())
3423  return ACC_plusZero;
3424 
3425  // Honor an explicit 'retained' attribute, except that for
3426  // now we're not going to permit implicit handling of +1 results,
3427  // because it's a bit frightening.
3428  if (fn->hasAttr<CFReturnsRetainedAttr>())
3429  return Diagnose ? ACC_plusOne
3430  : ACC_invalid; // ACC_plusOne if we start accepting this
3431 
3432  // Recognize this specific builtin function, which is used by CFSTR.
3433  unsigned builtinID = fn->getBuiltinID();
3434  if (builtinID == Builtin::BI__builtin___CFStringMakeConstantString)
3435  return ACC_bottom;
3436 
3437  // Otherwise, don't do anything implicit with an unaudited function.
3438  if (!fn->hasAttr<CFAuditedTransferAttr>())
3439  return ACC_invalid;
3440 
3441  // Otherwise, it's +0 unless it follows the create convention.
3443  return Diagnose ? ACC_plusOne
3444  : ACC_invalid; // ACC_plusOne if we start accepting this
3445 
3446  return ACC_plusZero;
3447  }
3448 
3449  ACCResult VisitObjCMessageExpr(ObjCMessageExpr *e) {
3450  return checkCallToMethod(e->getMethodDecl());
3451  }
3452 
3453  ACCResult VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *e) {
3454  ObjCMethodDecl *method;
3455  if (e->isExplicitProperty())
3456  method = e->getExplicitProperty()->getGetterMethodDecl();
3457  else
3458  method = e->getImplicitPropertyGetter();
3459  return checkCallToMethod(method);
3460  }
3461 
3462  ACCResult checkCallToMethod(ObjCMethodDecl *method) {
3463  if (!method) return ACC_invalid;
3464 
3465  // Check for message sends to functions returning CF types. We
3466  // just obey the Cocoa conventions with these, even though the
3467  // return type is CF.
3468  if (!isAnyRetainable(TargetClass) || !isCFType(method->getReturnType()))
3469  return ACC_invalid;
3470 
3471  // If the method is explicitly marked not-retained, it's +0.
3472  if (method->hasAttr<CFReturnsNotRetainedAttr>())
3473  return ACC_plusZero;
3474 
3475  // If the method is explicitly marked as returning retained, or its
3476  // selector follows a +1 Cocoa convention, treat it as +1.
3477  if (method->hasAttr<CFReturnsRetainedAttr>())
3478  return ACC_plusOne;
3479 
3480  switch (method->getSelector().getMethodFamily()) {
3481  case OMF_alloc:
3482  case OMF_copy:
3483  case OMF_mutableCopy:
3484  case OMF_new:
3485  return ACC_plusOne;
3486 
3487  default:
3488  // Otherwise, treat it as +0.
3489  return ACC_plusZero;
3490  }
3491  }
3492  };
3493 } // end anonymous namespace
3494 
3495 bool Sema::isKnownName(StringRef name) {
3496  if (name.empty())
3497  return false;
3498  LookupResult R(*this, &Context.Idents.get(name), SourceLocation(),
3500  return LookupName(R, TUScope, false);
3501 }
3502 
3504  DiagnosticBuilder &DiagB,
3506  SourceLocation afterLParen,
3507  QualType castType,
3508  Expr *castExpr,
3509  Expr *realCast,
3510  const char *bridgeKeyword,
3511  const char *CFBridgeName) {
3512  // We handle C-style and implicit casts here.
3513  switch (CCK) {
3516  case Sema::CCK_CStyleCast:
3517  case Sema::CCK_OtherCast:
3518  break;
3520  return;
3521  }
3522 
3523  if (CFBridgeName) {
3524  if (CCK == Sema::CCK_OtherCast) {
3525  if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3526  SourceRange range(NCE->getOperatorLoc(),
3527  NCE->getAngleBrackets().getEnd());
3528  SmallString<32> BridgeCall;
3529 
3531  char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3532  if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3533  BridgeCall += ' ';
3534 
3535  BridgeCall += CFBridgeName;
3536  DiagB.AddFixItHint(FixItHint::CreateReplacement(range, BridgeCall));
3537  }
3538  return;
3539  }
3540  Expr *castedE = castExpr;
3541  if (CStyleCastExpr *CCE = dyn_cast<CStyleCastExpr>(castedE))
3542  castedE = CCE->getSubExpr();
3543  castedE = castedE->IgnoreImpCasts();
3544  SourceRange range = castedE->getSourceRange();
3545 
3546  SmallString<32> BridgeCall;
3547 
3549  char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3550  if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3551  BridgeCall += ' ';
3552 
3553  BridgeCall += CFBridgeName;
3554 
3555  if (isa<ParenExpr>(castedE)) {
3557  BridgeCall));
3558  } else {
3559  BridgeCall += '(';
3561  BridgeCall));
3563  S.getLocForEndOfToken(range.getEnd()),
3564  ")"));
3565  }
3566  return;
3567  }
3568 
3569  if (CCK == Sema::CCK_CStyleCast) {
3570  DiagB.AddFixItHint(FixItHint::CreateInsertion(afterLParen, bridgeKeyword));
3571  } else if (CCK == Sema::CCK_OtherCast) {
3572  if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3573  std::string castCode = "(";
3574  castCode += bridgeKeyword;
3575  castCode += castType.getAsString();
3576  castCode += ")";
3577  SourceRange Range(NCE->getOperatorLoc(),
3578  NCE->getAngleBrackets().getEnd());
3579  DiagB.AddFixItHint(FixItHint::CreateReplacement(Range, castCode));
3580  }
3581  } else {
3582  std::string castCode = "(";
3583  castCode += bridgeKeyword;
3584  castCode += castType.getAsString();
3585  castCode += ")";
3586  Expr *castedE = castExpr->IgnoreImpCasts();
3587  SourceRange range = castedE->getSourceRange();
3588  if (isa<ParenExpr>(castedE)) {
3590  castCode));
3591  } else {
3592  castCode += "(";
3594  castCode));
3596  S.getLocForEndOfToken(range.getEnd()),
3597  ")"));
3598  }
3599  }
3600 }
3601 
3602 template <typename T>
3603 static inline T *getObjCBridgeAttr(const TypedefType *TD) {
3604  TypedefNameDecl *TDNDecl = TD->getDecl();
3605  QualType QT = TDNDecl->getUnderlyingType();
3606  if (QT->isPointerType()) {
3607  QT = QT->getPointeeType();
3608  if (const RecordType *RT = QT->getAs<RecordType>())
3609  if (RecordDecl *RD = RT->getDecl()->getMostRecentDecl())
3610  return RD->getAttr<T>();
3611  }
3612  return nullptr;
3613 }
3614 
3615 static ObjCBridgeRelatedAttr *ObjCBridgeRelatedAttrFromType(QualType T,
3616  TypedefNameDecl *&TDNDecl) {
3617  while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3618  TDNDecl = TD->getDecl();
3619  if (ObjCBridgeRelatedAttr *ObjCBAttr =
3620  getObjCBridgeAttr<ObjCBridgeRelatedAttr>(TD))
3621  return ObjCBAttr;
3622  T = TDNDecl->getUnderlyingType();
3623  }
3624  return nullptr;
3625 }
3626 
3627 static void
3629  QualType castType, ARCConversionTypeClass castACTC,
3630  Expr *castExpr, Expr *realCast,
3631  ARCConversionTypeClass exprACTC,
3633  SourceLocation loc =
3634  (castRange.isValid() ? castRange.getBegin() : castExpr->getExprLoc());
3635 
3637  UnavailableAttr::IR_ARCForbiddenConversion))
3638  return;
3639 
3640  QualType castExprType = castExpr->getType();
3641  // Defer emitting a diagnostic for bridge-related casts; that will be
3642  // handled by CheckObjCBridgeRelatedConversions.
3643  TypedefNameDecl *TDNDecl = nullptr;
3644  if ((castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable &&
3645  ObjCBridgeRelatedAttrFromType(castType, TDNDecl)) ||
3646  (exprACTC == ACTC_coreFoundation && castACTC == ACTC_retainable &&
3647  ObjCBridgeRelatedAttrFromType(castExprType, TDNDecl)))
3648  return;
3649 
3650  unsigned srcKind = 0;
3651  switch (exprACTC) {
3652  case ACTC_none:
3653  case ACTC_coreFoundation:
3654  case ACTC_voidPtr:
3655  srcKind = (castExprType->isPointerType() ? 1 : 0);
3656  break;
3657  case ACTC_retainable:
3658  srcKind = (castExprType->isBlockPointerType() ? 2 : 3);
3659  break;
3661  srcKind = 4;
3662  break;
3663  }
3664 
3665  // Check whether this could be fixed with a bridge cast.
3666  SourceLocation afterLParen = S.getLocForEndOfToken(castRange.getBegin());
3667  SourceLocation noteLoc = afterLParen.isValid() ? afterLParen : loc;
3668 
3669  unsigned convKindForDiag = Sema::isCast(CCK) ? 0 : 1;
3670 
3671  // Bridge from an ARC type to a CF type.
3672  if (castACTC == ACTC_retainable && isAnyRetainable(exprACTC)) {
3673 
3674  S.Diag(loc, diag::err_arc_cast_requires_bridge)
3675  << convKindForDiag
3676  << 2 // of C pointer type
3677  << castExprType
3678  << unsigned(castType->isBlockPointerType()) // to ObjC|block type
3679  << castType
3680  << castRange
3681  << castExpr->getSourceRange();
3682  bool br = S.isKnownName("CFBridgingRelease");
3683  ACCResult CreateRule =
3684  ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3685  assert(CreateRule != ACC_bottom && "This cast should already be accepted.");
3686  if (CreateRule != ACC_plusOne)
3687  {
3688  DiagnosticBuilder DiagB =
3689  (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3690  : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3691 
3692  addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3693  castType, castExpr, realCast, "__bridge ",
3694  nullptr);
3695  }
3696  if (CreateRule != ACC_plusZero)
3697  {
3698  DiagnosticBuilder DiagB =
3699  (CCK == Sema::CCK_OtherCast && !br) ?
3700  S.Diag(noteLoc, diag::note_arc_cstyle_bridge_transfer) << castExprType :
3701  S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3702  diag::note_arc_bridge_transfer)
3703  << castExprType << br;
3704 
3705  addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3706  castType, castExpr, realCast, "__bridge_transfer ",
3707  br ? "CFBridgingRelease" : nullptr);
3708  }
3709 
3710  return;
3711  }
3712 
3713  // Bridge from a CF type to an ARC type.
3714  if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC)) {
3715  bool br = S.isKnownName("CFBridgingRetain");
3716  S.Diag(loc, diag::err_arc_cast_requires_bridge)
3717  << convKindForDiag
3718  << unsigned(castExprType->isBlockPointerType()) // of ObjC|block type
3719  << castExprType
3720  << 2 // to C pointer type
3721  << castType
3722  << castRange
3723  << castExpr->getSourceRange();
3724  ACCResult CreateRule =
3725  ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3726  assert(CreateRule != ACC_bottom && "This cast should already be accepted.");
3727  if (CreateRule != ACC_plusOne)
3728  {
3729  DiagnosticBuilder DiagB =
3730  (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3731  : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3732  addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3733  castType, castExpr, realCast, "__bridge ",
3734  nullptr);
3735  }
3736  if (CreateRule != ACC_plusZero)
3737  {
3738  DiagnosticBuilder DiagB =
3739  (CCK == Sema::CCK_OtherCast && !br) ?
3740  S.Diag(noteLoc, diag::note_arc_cstyle_bridge_retained) << castType :
3741  S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3742  diag::note_arc_bridge_retained)
3743  << castType << br;
3744 
3745  addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3746  castType, castExpr, realCast, "__bridge_retained ",
3747  br ? "CFBridgingRetain" : nullptr);
3748  }
3749 
3750  return;
3751  }
3752 
3753  S.Diag(loc, diag::err_arc_mismatched_cast)
3754  << !convKindForDiag
3755  << srcKind << castExprType << castType
3756  << castRange << castExpr->getSourceRange();
3757 }
3758 
3759 template <typename TB>
3760 static bool CheckObjCBridgeNSCast(Sema &S, QualType castType, Expr *castExpr,
3761  bool &HadTheAttribute, bool warn) {
3762  QualType T = castExpr->getType();
3763  HadTheAttribute = false;
3764  while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3765  TypedefNameDecl *TDNDecl = TD->getDecl();
3766  if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3767  if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3768  HadTheAttribute = true;
3769  if (Parm->isStr("id"))
3770  return true;
3771 
3772  NamedDecl *Target = nullptr;
3773  // Check for an existing type with this name.
3776  if (S.LookupName(R, S.TUScope)) {
3777  Target = R.getFoundDecl();
3778  if (Target && isa<ObjCInterfaceDecl>(Target)) {
3779  ObjCInterfaceDecl *ExprClass = cast<ObjCInterfaceDecl>(Target);
3780  if (const ObjCObjectPointerType *InterfacePointerType =
3781  castType->getAsObjCInterfacePointerType()) {
3782  ObjCInterfaceDecl *CastClass
3783  = InterfacePointerType->getObjectType()->getInterface();
3784  if ((CastClass == ExprClass) ||
3785  (CastClass && CastClass->isSuperClassOf(ExprClass)))
3786  return true;
3787  if (warn)
3788  S.Diag(castExpr->getBeginLoc(), diag::warn_objc_invalid_bridge)
3789  << T << Target->getName() << castType->getPointeeType();
3790  return false;
3791  } else if (castType->isObjCIdType() ||
3793  castType, ExprClass)))
3794  // ok to cast to 'id'.
3795  // casting to id<p-list> is ok if bridge type adopts all of
3796  // p-list protocols.
3797  return true;
3798  else {
3799  if (warn) {
3800  S.Diag(castExpr->getBeginLoc(), diag::warn_objc_invalid_bridge)
3801  << T << Target->getName() << castType;
3802  S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3803  S.Diag(Target->getBeginLoc(), diag::note_declared_at);
3804  }
3805  return false;
3806  }
3807  }
3808  } else if (!castType->isObjCIdType()) {
3809  S.Diag(castExpr->getBeginLoc(),
3810  diag::err_objc_cf_bridged_not_interface)
3811  << castExpr->getType() << Parm;
3812  S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3813  if (Target)
3814  S.Diag(Target->getBeginLoc(), diag::note_declared_at);
3815  }
3816  return true;
3817  }
3818  return false;
3819  }
3820  T = TDNDecl->getUnderlyingType();
3821  }
3822  return true;
3823 }
3824 
3825 template <typename TB>
3826 static bool CheckObjCBridgeCFCast(Sema &S, QualType castType, Expr *castExpr,
3827  bool &HadTheAttribute, bool warn) {
3828  QualType T = castType;
3829  HadTheAttribute = false;
3830  while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3831  TypedefNameDecl *TDNDecl = TD->getDecl();
3832  if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3833  if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3834  HadTheAttribute = true;
3835  if (Parm->isStr("id"))
3836  return true;
3837 
3838  NamedDecl *Target = nullptr;
3839  // Check for an existing type with this name.
3842  if (S.LookupName(R, S.TUScope)) {
3843  Target = R.getFoundDecl();
3844  if (Target && isa<ObjCInterfaceDecl>(Target)) {
3845  ObjCInterfaceDecl *CastClass = cast<ObjCInterfaceDecl>(Target);
3846  if (const ObjCObjectPointerType *InterfacePointerType =
3847  castExpr->getType()->getAsObjCInterfacePointerType()) {
3848  ObjCInterfaceDecl *ExprClass
3849  = InterfacePointerType->getObjectType()->getInterface();
3850  if ((CastClass == ExprClass) ||
3851  (ExprClass && CastClass->isSuperClassOf(ExprClass)))
3852  return true;
3853  if (warn) {
3854  S.Diag(castExpr->getBeginLoc(),
3855  diag::warn_objc_invalid_bridge_to_cf)
3856  << castExpr->getType()->getPointeeType() << T;
3857  S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3858  }
3859  return false;
3860  } else if (castExpr->getType()->isObjCIdType() ||
3862  castExpr->getType(), CastClass)))
3863  // ok to cast an 'id' expression to a CFtype.
3864  // ok to cast an 'id<plist>' expression to CFtype provided plist
3865  // adopts all of CFtype's ObjetiveC's class plist.
3866  return true;
3867  else {
3868  if (warn) {
3869  S.Diag(castExpr->getBeginLoc(),
3870  diag::warn_objc_invalid_bridge_to_cf)
3871  << castExpr->getType() << castType;
3872  S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3873  S.Diag(Target->getBeginLoc(), diag::note_declared_at);
3874  }
3875  return false;
3876  }
3877  }
3878  }
3879  S.Diag(castExpr->getBeginLoc(),
3880  diag::err_objc_ns_bridged_invalid_cfobject)
3881  << castExpr->getType() << castType;
3882  S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3883  if (Target)
3884  S.Diag(Target->getBeginLoc(), diag::note_declared_at);
3885  return true;
3886  }
3887  return false;
3888  }
3889  T = TDNDecl->getUnderlyingType();
3890  }
3891  return true;
3892 }
3893 
3895  if (!getLangOpts().ObjC1)
3896  return;
3897  // warn in presence of __bridge casting to or from a toll free bridge cast.
3900  if (castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) {
3901  bool HasObjCBridgeAttr;
3902  bool ObjCBridgeAttrWillNotWarn =
3903  CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3904  false);
3905  if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
3906  return;
3907  bool HasObjCBridgeMutableAttr;
3908  bool ObjCBridgeMutableAttrWillNotWarn =
3909  CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3910  HasObjCBridgeMutableAttr, false);
3911  if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
3912  return;
3913 
3914  if (HasObjCBridgeAttr)
3915  CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3916  true);
3917  else if (HasObjCBridgeMutableAttr)
3918  CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3919  HasObjCBridgeMutableAttr, true);
3920  }
3921  else if (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable) {
3922  bool HasObjCBridgeAttr;
3923  bool ObjCBridgeAttrWillNotWarn =
3924  CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3925  false);
3926  if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
3927  return;
3928  bool HasObjCBridgeMutableAttr;
3929  bool ObjCBridgeMutableAttrWillNotWarn =
3930  CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3931  HasObjCBridgeMutableAttr, false);
3932  if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
3933  return;
3934 
3935  if (HasObjCBridgeAttr)
3936  CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3937  true);
3938  else if (HasObjCBridgeMutableAttr)
3939  CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3940  HasObjCBridgeMutableAttr, true);
3941  }
3942 }
3943 
3945  QualType SrcType = castExpr->getType();
3946  if (ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(castExpr)) {
3947  if (PRE->isExplicitProperty()) {
3948  if (ObjCPropertyDecl *PDecl = PRE->getExplicitProperty())
3949  SrcType = PDecl->getType();
3950  }
3951  else if (PRE->isImplicitProperty()) {
3952  if (ObjCMethodDecl *Getter = PRE->getImplicitPropertyGetter())
3953  SrcType = Getter->getReturnType();
3954  }
3955  }
3956 
3958  ARCConversionTypeClass castExprACTC = classifyTypeForARCConversion(castType);
3959  if (srcExprACTC != ACTC_retainable || castExprACTC != ACTC_coreFoundation)
3960  return;
3961  CheckObjCBridgeRelatedConversions(castExpr->getBeginLoc(), castType, SrcType,
3962  castExpr);
3963 }
3964 
3966  CastKind &Kind) {
3967  if (!getLangOpts().ObjC1)
3968  return false;
3969  ARCConversionTypeClass exprACTC =
3972  if ((castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) ||
3973  (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable)) {
3974  CheckTollFreeBridgeCast(castType, castExpr);
3975  Kind = (castACTC == ACTC_coreFoundation) ? CK_BitCast
3976  : CK_CPointerToObjCPointerCast;
3977  return true;
3978  }
3979  return false;
3980 }
3981 
3983  QualType DestType, QualType SrcType,
3984  ObjCInterfaceDecl *&RelatedClass,
3985  ObjCMethodDecl *&ClassMethod,
3986  ObjCMethodDecl *&InstanceMethod,
3987  TypedefNameDecl *&TDNDecl,
3988  bool CfToNs, bool Diagnose) {
3989  QualType T = CfToNs ? SrcType : DestType;
3990  ObjCBridgeRelatedAttr *ObjCBAttr = ObjCBridgeRelatedAttrFromType(T, TDNDecl);
3991  if (!ObjCBAttr)
3992  return false;
3993 
3994  IdentifierInfo *RCId = ObjCBAttr->getRelatedClass();
3995  IdentifierInfo *CMId = ObjCBAttr->getClassMethod();
3996  IdentifierInfo *IMId = ObjCBAttr->getInstanceMethod();
3997  if (!RCId)
3998  return false;
3999  NamedDecl *Target = nullptr;
4000  // Check for an existing type with this name.
4001  LookupResult R(*this, DeclarationName(RCId), SourceLocation(),
4003  if (!LookupName(R, TUScope)) {
4004  if (Diagnose) {
4005  Diag(Loc, diag::err_objc_bridged_related_invalid_class) << RCId
4006  << SrcType << DestType;
4007  Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4008  }
4009  return false;
4010  }
4011  Target = R.getFoundDecl();
4012  if (Target && isa<ObjCInterfaceDecl>(Target))
4013  RelatedClass = cast<ObjCInterfaceDecl>(Target);
4014  else {
4015  if (Diagnose) {
4016  Diag(Loc, diag::err_objc_bridged_related_invalid_class_name) << RCId
4017  << SrcType << DestType;
4018  Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4019  if (Target)
4020  Diag(Target->getBeginLoc(), diag::note_declared_at);
4021  }
4022  return false;
4023  }
4024 
4025  // Check for an existing class method with the given selector name.
4026  if (CfToNs && CMId) {
4027  Selector Sel = Context.Selectors.getUnarySelector(CMId);
4028  ClassMethod = RelatedClass->lookupMethod(Sel, false);
4029  if (!ClassMethod) {
4030  if (Diagnose) {
4031  Diag(Loc, diag::err_objc_bridged_related_known_method)
4032  << SrcType << DestType << Sel << false;
4033  Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4034  }
4035  return false;
4036  }
4037  }
4038 
4039  // Check for an existing instance method with the given selector name.
4040  if (!CfToNs && IMId) {
4041  Selector Sel = Context.Selectors.getNullarySelector(IMId);
4042  InstanceMethod = RelatedClass->lookupMethod(Sel, true);
4043  if (!InstanceMethod) {
4044  if (Diagnose) {
4045  Diag(Loc, diag::err_objc_bridged_related_known_method)
4046  << SrcType << DestType << Sel << true;
4047  Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4048  }
4049  return false;
4050  }
4051  }
4052  return true;
4053 }
4054 
4055 bool
4057  QualType DestType, QualType SrcType,
4058  Expr *&SrcExpr, bool Diagnose) {
4060  ARCConversionTypeClass lhsExprACTC = classifyTypeForARCConversion(DestType);
4061  bool CfToNs = (rhsExprACTC == ACTC_coreFoundation && lhsExprACTC == ACTC_retainable);
4062  bool NsToCf = (rhsExprACTC == ACTC_retainable && lhsExprACTC == ACTC_coreFoundation);
4063  if (!CfToNs && !NsToCf)
4064  return false;
4065 
4066  ObjCInterfaceDecl *RelatedClass;
4067  ObjCMethodDecl *ClassMethod = nullptr;
4068  ObjCMethodDecl *InstanceMethod = nullptr;
4069  TypedefNameDecl *TDNDecl = nullptr;
4070  if (!checkObjCBridgeRelatedComponents(Loc, DestType, SrcType, RelatedClass,
4071  ClassMethod, InstanceMethod, TDNDecl,
4072  CfToNs, Diagnose))
4073  return false;
4074 
4075  if (CfToNs) {
4076  // Implicit conversion from CF to ObjC object is needed.
4077  if (ClassMethod) {
4078  if (Diagnose) {
4079  std::string ExpressionString = "[";
4080  ExpressionString += RelatedClass->getNameAsString();
4081  ExpressionString += " ";
4082  ExpressionString += ClassMethod->getSelector().getAsString();
4083  SourceLocation SrcExprEndLoc =
4084  getLocForEndOfToken(SrcExpr->getEndLoc());
4085  // Provide a fixit: [RelatedClass ClassMethod SrcExpr]
4086  Diag(Loc, diag::err_objc_bridged_related_known_method)
4087  << SrcType << DestType << ClassMethod->getSelector() << false
4089  ExpressionString)
4090  << FixItHint::CreateInsertion(SrcExprEndLoc, "]");
4091  Diag(RelatedClass->getBeginLoc(), diag::note_declared_at);
4092  Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4093 
4094  QualType receiverType = Context.getObjCInterfaceType(RelatedClass);
4095  // Argument.
4096  Expr *args[] = { SrcExpr };
4097  ExprResult msg = BuildClassMessageImplicit(receiverType, false,
4098  ClassMethod->getLocation(),
4099  ClassMethod->getSelector(), ClassMethod,
4100  MultiExprArg(args, 1));
4101  SrcExpr = msg.get();
4102  }
4103  return true;
4104  }
4105  }
4106  else {
4107  // Implicit conversion from ObjC type to CF object is needed.
4108  if (InstanceMethod) {
4109  if (Diagnose) {
4110  std::string ExpressionString;
4111  SourceLocation SrcExprEndLoc =
4112  getLocForEndOfToken(SrcExpr->getEndLoc());
4113  if (InstanceMethod->isPropertyAccessor())
4114  if (const ObjCPropertyDecl *PDecl =
4115  InstanceMethod->findPropertyDecl()) {
4116  // fixit: ObjectExpr.propertyname when it is aproperty accessor.
4117  ExpressionString = ".";
4118  ExpressionString += PDecl->getNameAsString();
4119  Diag(Loc, diag::err_objc_bridged_related_known_method)
4120  << SrcType << DestType << InstanceMethod->getSelector() << true
4121  << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
4122  }
4123  if (ExpressionString.empty()) {
4124  // Provide a fixit: [ObjectExpr InstanceMethod]
4125  ExpressionString = " ";
4126  ExpressionString += InstanceMethod->getSelector().getAsString();
4127  ExpressionString += "]";
4128 
4129  Diag(Loc, diag::err_objc_bridged_related_known_method)
4130  << SrcType << DestType << InstanceMethod->getSelector() << true
4131  << FixItHint::CreateInsertion(SrcExpr->getBeginLoc(), "[")
4132  << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
4133  }
4134  Diag(RelatedClass->getBeginLoc(), diag::note_declared_at);
4135  Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4136 
4137  ExprResult msg =
4138  BuildInstanceMessageImplicit(SrcExpr, SrcType,
4139  InstanceMethod->getLocation(),
4140  InstanceMethod->getSelector(),
4141  InstanceMethod, None);
4142  SrcExpr = msg.get();
4143  }
4144  return true;
4145  }
4146  }
4147  return false;
4148 }
4149 
4153  bool Diagnose, bool DiagnoseCFAudited,
4154  BinaryOperatorKind Opc) {
4155  QualType castExprType = castExpr->getType();
4156 
4157  // For the purposes of the classification, we assume reference types
4158  // will bind to temporaries.
4159  QualType effCastType = castType;
4160  if (const ReferenceType *ref = castType->getAs<ReferenceType>())
4161  effCastType = ref->getPointeeType();
4162 
4163  ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExprType);
4164  ARCConversionTypeClass castACTC = classifyTypeForARCConversion(effCastType);
4165  if (exprACTC == castACTC) {
4166  // Check for viability and report error if casting an rvalue to a
4167  // life-time qualifier.
4168  if (castACTC == ACTC_retainable &&
4169  (CCK == CCK_CStyleCast || CCK == CCK_OtherCast) &&
4170  castType != castExprType) {
4171  const Type *DT = castType.getTypePtr();
4172  QualType QDT = castType;
4173  // We desugar some types but not others. We ignore those
4174  // that cannot happen in a cast; i.e. auto, and those which
4175  // should not be de-sugared; i.e typedef.
4176  if (const ParenType *PT = dyn_cast<ParenType>(DT))
4177  QDT = PT->desugar();
4178  else if (const TypeOfType *TP = dyn_cast<TypeOfType>(DT))
4179  QDT = TP->desugar();
4180  else if (const AttributedType *AT = dyn_cast<AttributedType>(DT))
4181  QDT = AT->desugar();
4182  if (QDT != castType &&
4184  if (Diagnose) {
4185  SourceLocation loc = (castRange.isValid() ? castRange.getBegin()
4186  : castExpr->getExprLoc());
4187  Diag(loc, diag::err_arc_nolifetime_behavior);
4188  }
4189  return ACR_error;
4190  }
4191  }
4192  return ACR_okay;
4193  }
4194 
4195  // The life-time qualifier cast check above is all we need for ObjCWeak.
4196  // ObjCAutoRefCount has more restrictions on what is legal.
4197  if (!getLangOpts().ObjCAutoRefCount)
4198  return ACR_okay;
4199 
4200  if (isAnyCLike(exprACTC) && isAnyCLike(castACTC)) return ACR_okay;
4201 
4202  // Allow all of these types to be cast to integer types (but not
4203  // vice-versa).
4204  if (castACTC == ACTC_none && castType->isIntegralType(Context))
4205  return ACR_okay;
4206 
4207  // Allow casts between pointers to lifetime types (e.g., __strong id*)
4208  // and pointers to void (e.g., cv void *). Casting from void* to lifetime*
4209  // must be explicit.
4210  if (exprACTC == ACTC_indirectRetainable && castACTC == ACTC_voidPtr)
4211  return ACR_okay;
4212  if (castACTC == ACTC_indirectRetainable && exprACTC == ACTC_voidPtr &&
4213  isCast(CCK))
4214  return ACR_okay;
4215 
4216  switch (ARCCastChecker(Context, exprACTC, castACTC, false).Visit(castExpr)) {
4217  // For invalid casts, fall through.
4218  case ACC_invalid:
4219  break;
4220 
4221  // Do nothing for both bottom and +0.
4222  case ACC_bottom:
4223  case ACC_plusZero:
4224  return ACR_okay;
4225 
4226  // If the result is +1, consume it here.
4227  case ACC_plusOne:
4228  castExpr = ImplicitCastExpr::Create(Context, castExpr->getType(),
4229  CK_ARCConsumeObject, castExpr,
4230  nullptr, VK_RValue);
4231  Cleanup.setExprNeedsCleanups(true);
4232  return ACR_okay;
4233  }
4234 
4235  // If this is a non-implicit cast from id or block type to a
4236  // CoreFoundation type, delay complaining in case the cast is used
4237  // in an acceptable context.
4238  if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC) && isCast(CCK))
4239  return ACR_unbridged;
4240 
4241  // Issue a diagnostic about a missing @-sign when implicit casting a cstring
4242  // to 'NSString *', instead of falling through to report a "bridge cast"
4243  // diagnostic.
4244  if (castACTC == ACTC_retainable && exprACTC == ACTC_none &&
4245  ConversionToObjCStringLiteralCheck(castType, castExpr, Diagnose))
4246  return ACR_error;
4247 
4248  // Do not issue "bridge cast" diagnostic when implicit casting
4249  // a retainable object to a CF type parameter belonging to an audited
4250  // CF API function. Let caller issue a normal type mismatched diagnostic
4251  // instead.
4252  if ((!DiagnoseCFAudited || exprACTC != ACTC_retainable ||
4253  castACTC != ACTC_coreFoundation) &&
4254  !(exprACTC == ACTC_voidPtr && castACTC == ACTC_retainable &&
4255  (Opc == BO_NE || Opc == BO_EQ))) {
4256  if (Diagnose)
4257  diagnoseObjCARCConversion(*this, castRange, castType, castACTC, castExpr,
4258  castExpr, exprACTC, CCK);
4259  return ACR_error;
4260  }
4261  return ACR_okay;
4262 }
4263 
4264 /// Given that we saw an expression with the ARCUnbridgedCastTy
4265 /// placeholder type, complain bitterly.
4267  // We expect the spurious ImplicitCastExpr to already have been stripped.
4268  assert(!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast));
4269  CastExpr *realCast = cast<CastExpr>(e->IgnoreParens());
4270 
4271  SourceRange castRange;
4272  QualType castType;
4274 
4275  if (CStyleCastExpr *cast = dyn_cast<CStyleCastExpr>(realCast)) {
4276  castRange = SourceRange(cast->getLParenLoc(), cast->getRParenLoc());
4277  castType = cast->getTypeAsWritten();
4278  CCK = CCK_CStyleCast;
4279  } else if (ExplicitCastExpr *cast = dyn_cast<ExplicitCastExpr>(realCast)) {
4280  castRange = cast->getTypeInfoAsWritten()->getTypeLoc().getSourceRange();
4281  castType = cast->getTypeAsWritten();
4282  CCK = CCK_OtherCast;
4283  } else {
4284  llvm_unreachable("Unexpected ImplicitCastExpr");
4285  }
4286 
4287  ARCConversionTypeClass castACTC =
4289 
4290  Expr *castExpr = realCast->getSubExpr();
4291  assert(classifyTypeForARCConversion(castExpr->getType()) == ACTC_retainable);
4292 
4293  diagnoseObjCARCConversion(*this, castRange, castType, castACTC,
4294  castExpr, realCast, ACTC_retainable, CCK);
4295 }
4296 
4297 /// stripARCUnbridgedCast - Given an expression of ARCUnbridgedCast
4298 /// type, remove the placeholder cast.
4300  assert(e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast));
4301 
4302  if (ParenExpr *pe = dyn_cast<ParenExpr>(e)) {
4303  Expr *sub = stripARCUnbridgedCast(pe->getSubExpr());
4304  return new (Context) ParenExpr(pe->getLParen(), pe->getRParen(), sub);
4305  } else if (UnaryOperator *uo = dyn_cast<UnaryOperator>(e)) {
4306  assert(uo->getOpcode() == UO_Extension);
4307  Expr *sub = stripARCUnbridgedCast(uo->getSubExpr());
4308  return new (Context)
4309  UnaryOperator(sub, UO_Extension, sub->getType(), sub->getValueKind(),
4310  sub->getObjectKind(), uo->getOperatorLoc(), false);
4311  } else if (GenericSelectionExpr *gse = dyn_cast<GenericSelectionExpr>(e)) {
4312  assert(!gse->isResultDependent());
4313 
4314  unsigned n = gse->getNumAssocs();
4315  SmallVector<Expr*, 4> subExprs(n);
4316  SmallVector<TypeSourceInfo*, 4> subTypes(n);
4317  for (unsigned i = 0; i != n; ++i) {
4318  subTypes[i] = gse->getAssocTypeSourceInfo(i);
4319  Expr *sub = gse->getAssocExpr(i);
4320  if (i == gse->getResultIndex())
4321  sub = stripARCUnbridgedCast(sub);
4322  subExprs[i] = sub;
4323  }
4324 
4325  return new (Context) GenericSelectionExpr(Context, gse->getGenericLoc(),
4326  gse->getControllingExpr(),
4327  subTypes, subExprs,
4328  gse->getDefaultLoc(),
4329  gse->getRParenLoc(),
4330  gse->containsUnexpandedParameterPack(),
4331  gse->getResultIndex());
4332  } else {
4333  assert(isa<ImplicitCastExpr>(e) && "bad form of unbridged cast!");
4334  return cast<ImplicitCastExpr>(e)->getSubExpr();
4335  }
4336 }
4337 
4339  QualType exprType) {
4340  QualType canCastType =
4341  Context.getCanonicalType(castType).getUnqualifiedType();
4342  QualType canExprType =
4343  Context.getCanonicalType(exprType).getUnqualifiedType();
4344  if (isa<ObjCObjectPointerType>(canCastType) &&
4345  castType.getObjCLifetime() == Qualifiers::OCL_Weak &&
4346  canExprType->isObjCObjectPointerType()) {
4347  if (const ObjCObjectPointerType *ObjT =
4348  canExprType->getAs<ObjCObjectPointerType>())
4349  if (const ObjCInterfaceDecl *ObjI = ObjT->getInterfaceDecl())
4350  return !ObjI->isArcWeakrefUnavailable();
4351  }
4352  return true;
4353 }
4354 
4355 /// Look for an ObjCReclaimReturnedObject cast and destroy it.
4357  Expr *curExpr = e, *prevExpr = nullptr;
4358 
4359  // Walk down the expression until we hit an implicit cast of kind
4360  // ARCReclaimReturnedObject or an Expr that is neither a Paren nor a Cast.
4361  while (true) {
4362  if (auto *pe = dyn_cast<ParenExpr>(curExpr)) {
4363  prevExpr = curExpr;
4364  curExpr = pe->getSubExpr();
4365  continue;
4366  }
4367 
4368  if (auto *ce = dyn_cast<CastExpr>(curExpr)) {
4369  if (auto *ice = dyn_cast<ImplicitCastExpr>(ce))
4370  if (ice->getCastKind() == CK_ARCReclaimReturnedObject) {
4371  if (!prevExpr)
4372  return ice->getSubExpr();
4373  if (auto *pe = dyn_cast<ParenExpr>(prevExpr))
4374  pe->setSubExpr(ice->getSubExpr());
4375  else
4376  cast<CastExpr>(prevExpr)->setSubExpr(ice->getSubExpr());
4377  return e;
4378  }
4379 
4380  prevExpr = curExpr;
4381  curExpr = ce->getSubExpr();
4382  continue;
4383  }
4384 
4385  // Break out of the loop if curExpr is neither a Paren nor a Cast.
4386  break;
4387  }
4388 
4389  return e;
4390 }
4391 
4394  SourceLocation BridgeKeywordLoc,
4395  TypeSourceInfo *TSInfo,
4396  Expr *SubExpr) {
4397  ExprResult SubResult = UsualUnaryConversions(SubExpr);
4398  if (SubResult.isInvalid()) return ExprError();
4399  SubExpr = SubResult.get();
4400 
4401  QualType T = TSInfo->getType();
4402  QualType FromType = SubExpr->getType();
4403 
4404  CastKind CK;
4405 
4406  bool MustConsume = false;
4407  if (T->isDependentType() || SubExpr->isTypeDependent()) {
4408  // Okay: we'll build a dependent expression type.
4409  CK = CK_Dependent;
4410  } else if (T->isObjCARCBridgableType() && FromType->isCARCBridgableType()) {
4411  // Casting CF -> id
4412  CK = (T->isBlockPointerType() ? CK_AnyPointerToBlockPointerCast
4413  : CK_CPointerToObjCPointerCast);
4414  switch (Kind) {
4415  case OBC_Bridge:
4416  break;
4417 
4418  case OBC_BridgeRetained: {
4419  bool br = isKnownName("CFBridgingRelease");
4420  Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4421  << 2
4422  << FromType
4423  << (T->isBlockPointerType()? 1 : 0)
4424  << T
4425  << SubExpr->getSourceRange()
4426  << Kind;
4427  Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4428  << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge");
4429  Diag(BridgeKeywordLoc, diag::note_arc_bridge_transfer)
4430  << FromType << br
4431  << FixItHint::CreateReplacement(BridgeKeywordLoc,
4432  br ? "CFBridgingRelease "
4433  : "__bridge_transfer ");
4434 
4435  Kind = OBC_Bridge;
4436  break;
4437  }
4438 
4439  case OBC_BridgeTransfer:
4440  // We must consume the Objective-C object produced by the cast.
4441  MustConsume = true;
4442  break;
4443  }
4444  } else if (T->isCARCBridgableType() && FromType->isObjCARCBridgableType()) {
4445  // Okay: id -> CF
4446  CK = CK_BitCast;
4447  switch (Kind) {
4448  case OBC_Bridge:
4449  // Reclaiming a value that's going to be __bridge-casted to CF
4450  // is very dangerous, so we don't do it.
4451  SubExpr = maybeUndoReclaimObject(SubExpr);
4452  break;
4453 
4454  case OBC_BridgeRetained:
4455  // Produce the object before casting it.
4456  SubExpr = ImplicitCastExpr::Create(Context, FromType,
4457  CK_ARCProduceObject,
4458  SubExpr, nullptr, VK_RValue);
4459  break;
4460 
4461  case OBC_BridgeTransfer: {
4462  bool br = isKnownName("CFBridgingRetain");
4463  Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4464  << (FromType->isBlockPointerType()? 1 : 0)
4465  << FromType
4466  << 2
4467  << T
4468  << SubExpr->getSourceRange()
4469  << Kind;
4470 
4471  Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4472  << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge ");
4473  Diag(BridgeKeywordLoc, diag::note_arc_bridge_retained)
4474  << T << br
4475  << FixItHint::CreateReplacement(BridgeKeywordLoc,
4476  br ? "CFBridgingRetain " : "__bridge_retained");
4477 
4478  Kind = OBC_Bridge;
4479  break;
4480  }
4481  }
4482  } else {
4483  Diag(LParenLoc, diag::err_arc_bridge_cast_incompatible)
4484  << FromType << T << Kind
4485  << SubExpr->getSourceRange()
4486  << TSInfo->getTypeLoc().getSourceRange();
4487  return ExprError();
4488  }
4489 
4490  Expr *Result = new (Context) ObjCBridgedCastExpr(LParenLoc, Kind, CK,
4491  BridgeKeywordLoc,
4492  TSInfo, SubExpr);
4493 
4494  if (MustConsume) {
4495  Cleanup.setExprNeedsCleanups(true);
4496  Result = ImplicitCastExpr::Create(Context, T, CK_ARCConsumeObject, Result,
4497  nullptr, VK_RValue);
4498  }
4499 
4500  return Result;
4501 }
4502 
4504  SourceLocation LParenLoc,
4506  SourceLocation BridgeKeywordLoc,
4507  ParsedType Type,
4508  SourceLocation RParenLoc,
4509  Expr *SubExpr) {
4510  TypeSourceInfo *TSInfo = nullptr;
4511  QualType T = GetTypeFromParser(Type, &TSInfo);
4512  if (Kind == OBC_Bridge)
4513  CheckTollFreeBridgeCast(T, SubExpr);
4514  if (!TSInfo)
4515  TSInfo = Context.getTrivialTypeSourceInfo(T, LParenLoc);
4516  return BuildObjCBridgedCast(LParenLoc, Kind, BridgeKeywordLoc, TSInfo,
4517  SubExpr);
4518 }
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:1522
const internal::VariadicAllOfMatcher< Type > type
Matches Types in the clang AST.
Defines the clang::ASTContext interface.
ObjCMethodDecl * lookupPrivateClassMethod(const Selector &Sel)
Definition: DeclObjC.h:1854
bool hasDefinition() const
Determine whether this class has been defined.
Definition: DeclObjC.h:1527
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.
Represents a function declaration or definition.
Definition: Decl.h:1732
Stmt * body_back()
Definition: Stmt.h:649
Name lookup found a set of overloaded functions that met the criteria.
Definition: Lookup.h:64
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:1855
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:2533
QualType getPointeeType() const
Definition: Type.h:2546
CanQualType VoidPtrTy
Definition: ASTContext.h:1053
A (possibly-)qualified type.
Definition: Type.h:642
bool isBlockPointerType() const
Definition: Type.h:6278
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:1131
Simple class containing the result of Sema::CorrectTypo.
unsigned param_size() const
Definition: DeclObjC.h:341
Selector getSelector() const
Definition: ExprObjC.cpp:312
ObjCInterfaceDecl * getClassInterface()
Definition: DeclObjC.cpp:1144
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:9345
void* might be a normal C type, or it might a CF type.
void AddFixItHint(const FixItHint &Hint) const
Definition: Diagnostic.h:1168
QualType getDesugaredType(const ASTContext &Context) const
Return the specified type with any "sugar" removed from the type.
Definition: Type.h:942
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:3027
CompoundStmt * getSubStmt()
Definition: Expr.h:3632
CanQualType Char32Ty
Definition: ASTContext.h:1033
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:8181
Stmt - This represents one statement.
Definition: Stmt.h:66
NullabilityKind
Describes the nullability of a particular type.
Definition: Specifiers.h:285
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:578
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:497
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:471
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:811
bool isObjCARCBridgableType() const
Determine whether the given type T is a "bridgable" Objective-C type, which is either an Objective-C ...
Definition: Type.cpp:3918
bool isRecordType() const
Definition: Type.h:6343
bool isAscii() const
Definition: Expr.h:1664
static InitializedEntity InitializeParameter(ASTContext &Context, const ParmVarDecl *Parm)
Create the initialization entity for a parameter.
const ObjCObjectType * getAsObjCInterfaceType() const
Definition: Type.cpp:1574
SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID)
Emit a diagnostic.
Definition: Sema.h:1290
Decl - This represents one declaration (or definition), e.g.
Definition: DeclBase.h:87
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: DeclBase.h:410
static bool HelperToDiagnoseMismatchedMethodsInGlobalPool(Sema &S, SourceLocation AtLoc, SourceLocation LParenLoc, SourceLocation RParenLoc, ObjCMethodDecl *Method, ObjCMethodList &MethList)
SmallVectorImpl< Edit >::const_iterator edit_iterator
Definition: Commit.h:120
bool isExtVectorType() const
Definition: Type.h:6359
StringRef P
Scope * TUScope
Translation Unit Scope - useful to Objective-C actions that need to lookup file scope declarations in...
Definition: Sema.h:815
ParenExpr - This represents a parethesized expression, e.g.
Definition: Expr.h:1737
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:6219
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:1415
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:2808
SourceLocation getLocForEndOfToken(SourceLocation Loc, unsigned Offset=0)
Calls Lexer::getLocForEndOfToken()
Definition: Sema.cpp:46
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:105
ObjCSubscriptRefExpr - used for array and dictionary subscripting.
Definition: ExprObjC.h:803
const ObjCObjectPointerType * getAsObjCInterfacePointerType() const
Definition: Type.cpp:1582
static ExprValueKind getValueKindForType(QualType T)
getValueKindForType - Given a formal return or parameter type, give its value kind.
Definition: Expr.h:394
QualType withConst() const
Definition: Type.h:814
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:3923
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:888
ObjCMethodDecl * getMethod() const
void setDelegateInitCall(bool isDelegate)
Definition: ExprObjC.h:1361
QualType getElementType() const
Definition: Type.h:2843
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:97
An Objective-C array/dictionary subscripting which reads an object or writes at the subscripted array...
Definition: Specifiers.h:141
Represents a variable declaration or definition.
Definition: Decl.h:812
QualType getReturnType() const
Definition: Decl.h:2286
DiagnosticsEngine & Diags
Definition: Sema.h:322
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:6683
bool isInObjcMethodScope() const
isInObjcMethodScope - Return true if this scope is, or is contained in, an Objective-C method body...
Definition: Scope.h:353
ObjCMethodDecl - Represents an instance or class method declaration.
Definition: DeclObjC.h:139
DeclClass * getCorrectionDeclAs() const
bool isInvalidDecl() const
Definition: DeclBase.h:542
static ObjCPropertyDecl * findPropertyDecl(const DeclContext *DC, const IdentifierInfo *propertyID, ObjCPropertyQueryKind queryKind)
Lookup a property by name in the specified DeclContext.
Definition: DeclObjC.cpp:177
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:1146
static StringRef bytes(const std::vector< T, Allocator > &v)
Definition: ASTWriter.cpp:120
Represents a parameter to a function.
Definition: Decl.h:1551
ObjCPropertyDecl * getExplicitProperty() const
Definition: ExprObjC.h:670
bool canHaveNullability(bool ResultIfUnknown=true) const
Determine whether the given type can have a nullability specifier applied to it, i.e., if it is any kind of pointer type.
Definition: Type.cpp:3680
IdentifierInfo * getIdentifier() const
Get the identifier that names this declaration, if there is one.
Definition: Decl.h:269
Expr * IgnoreImpCasts() LLVM_READONLY
IgnoreImpCasts - Skip past any implicit casts which might surround this expression.
Definition: Expr.h:2982
Represents a struct/union/class.
Definition: Decl.h:3585
DeclarationName getDeclName() const
Get the actual, stored name of the declaration, which may be a special name.
Definition: Decl.h:297
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:847
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:552
Name lookup results in an ambiguity; use getAmbiguityKind to figure out what kind of ambiguity we hav...
Definition: Lookup.h:74
Expr * getFalseExpr() const
Definition: Expr.h:3440
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:5512
edit_iterator edit_end() const
Definition: Commit.h:123
ObjCMethodDecl * lookupInstanceMethod(Selector Sel) const
Lookup an instance method for a given selector.
Definition: DeclObjC.h:1839
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:154
void setObjCConstantStringInterface(ObjCInterfaceDecl *Decl)
A C-style cast.
Definition: Sema.h:9341
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
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Stmt.cpp:280
bool isObjCIdType() const
Definition: Type.h:6396
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:231
const ObjCObjectPointerType * getAsObjCQualifiedIdType() const
Definition: Type.cpp:1554
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:16553
LookupResultKind getResultKind() const
Definition: Lookup.h:310
static ObjCBridgeRelatedAttr * ObjCBridgeRelatedAttrFromType(QualType T, TypedefNameDecl *&TDNDecl)
Expr * getSubExpr()
Definition: Expr.h:2860
bool isObjCQualifiedClassType() const
Definition: Type.h:6390
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:56
IdentifierTable & Idents
Definition: ASTContext.h:565
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:110
Values of this type can be null.
bool isUnarySelector() const
ObjCMethodFamily getMethodFamily() const
Determines the family of this method.
Definition: DeclObjC.cpp:986
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:47
PtrTy get() const
Definition: Ownership.h:174
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:1456
ObjCContainerDecl - Represents a container for method declarations.
Definition: DeclObjC.h:961
ObjCMethodDecl * getCurMethodDecl()
getCurMethodDecl - If inside of a method body, this returns a pointer to the method decl for the meth...
Definition: Sema.cpp:1205
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:6732
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:1632
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Decl.h:2893
const ObjCObjectPointerType * getAsObjCQualifiedClassType() const
Definition: Type.cpp:1564
GlobalMethodPool MethodPool
Method Pool - allows efficient lookup when typechecking messages to "id".
Definition: Sema.h:1142
Represents a declaration of a type.
Definition: Decl.h:2866
A builtin binary operation expression such as "x + y" or "x <= y".
Definition: Expr.h:3107
CanQualType PseudoObjectTy
Definition: ASTContext.h:1056
tokloc_iterator tokloc_end() const
Definition: Expr.h:1715
A conversion for an operand of a builtin overloaded operator.
Definition: Sema.h:9347
CheckedConversionKind
The kind of conversion being performed.
Definition: Sema.h:9337
Expr * IgnoreParenCasts() LLVM_READONLY
IgnoreParenCasts - Ignore parentheses and casts.
Definition: Expr.cpp:2545
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:2202
Scope - A scope is a transient data structure that is used while parsing the program.
Definition: Scope.h:40
const Type * getTypePtr() const
Retrieves a pointer to the underlying (unqualified) type.
Definition: Type.h:6046
void getOverriddenMethods(SmallVectorImpl< const ObjCMethodDecl *> &Overridden) const
Return overridden methods for the given Method.
Definition: DeclObjC.cpp:1285
ObjCMethodDecl * lookupClassMethod(Selector Sel) const
Lookup a class method for a given selector.
Definition: DeclObjC.h:1844
void CheckTollFreeBridgeCast(QualType castType, Expr *castExpr)
CastExpr - Base class for type casts, including both implicit casts (ImplicitCastExpr) and explicit c...
Definition: Expr.h:2795
Represents an Objective-C protocol declaration.
Definition: DeclObjC.h:2056
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:850
const LangOptions & getLangOpts() const
Definition: Sema.h:1213
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:166
Represents an ObjC class declaration.
Definition: DeclObjC.h:1164
Bridging via __bridge_transfer, which transfers ownership of an Objective-C pointer into ARC...
QualType getReturnType() const
Definition: DeclObjC.h:323
ObjCInterfaceDecl * getInterface() const
Gets the interface declaration for this object type, if the base type really is an interface...
Definition: Type.h:5747
SourceLocation OrigLoc
Definition: Commit.h:41
QualType getObjCProtoType() const
Retrieve the type of the Objective-C Protocol class.
Definition: ASTContext.h:1901
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:887
const LangOptions & LangOpts
Definition: Sema.h:318
bool isKnownName(StringRef name)
ObjCMethodDecl * getCategoryClassMethod(Selector Sel) const
Definition: DeclObjC.cpp:1690
static bool isAnyRetainable(ARCConversionTypeClass ACTC)
bool hasAttr() const
Definition: DeclBase.h:531
ConditionalOperator - The ?: ternary operator.
Definition: Expr.h:3397
Sema - This implements semantic analysis and AST building for C.
Definition: Sema.h:278
RecordDecl * getMostRecentDecl()
Definition: Decl.h:3632
StringRef getString() const
Definition: Expr.h:1621
CharSourceRange getFileRange(SourceManager &SM) const
Definition: Commit.cpp:32
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:1042
A functional-style cast.
Definition: Sema.h:9343
int, void, struct A
const ObjCObjectType * getSuperClassType() const
Retrieve the superclass type.
Definition: DeclObjC.h:1557
Expr * IgnoreParenNoopCasts(ASTContext &Ctx) LLVM_READONLY
IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the value (including ptr->int ...
Definition: Expr.cpp:2665
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:5412
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:1786
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:2190
An Objective-C property is a logical field of an Objective-C object which is read and written via Obj...
Definition: Specifiers.h:136
ObjCStringFormatFamily getStringFormatFamily() const
This represents one expression.
Definition: Expr.h:105
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:810
ExprValueKind
The categorization of expression values, currently following the C++11 scheme.
Definition: Specifiers.h:107
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:4457
const T * castAs() const
Member-template castAs<specific type>.
Definition: Type.h:6746
static bool isAnyCLike(ARCConversionTypeClass ACTC)
bool isObjCRetainableType() const
Definition: Type.cpp:3889
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:257
Defines the clang::Preprocessor interface.
bool isObjCClassType() const
Definition: Type.h:6402
DeclContext * getDeclContext()
Definition: DeclBase.h:427
edit_iterator edit_begin() const
Definition: Commit.h:122
ObjCInterfaceDecl * getSuperClass() const
Definition: DeclObjC.cpp:338
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:16440
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:856
Defines the clang::TypeLoc interface and its subclasses.
IdentifierInfo * getAsIdentifierInfo() const
Retrieve the IdentifierInfo * stored in this declaration name, or null if this declaration name isn&#39;t...
Specifies that a value-dependent expression of integral or dependent type should be considered a null...
Definition: Expr.h:713
bool isInvalid() const
QualType getType() const
Definition: Expr.h:127
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:3801
DefinitionKind hasDefinition(ASTContext &) const
Check whether this variable is defined in this translation unit.
Definition: Decl.cpp:2141
ObjCIvarDecl * lookupInstanceVariable(IdentifierInfo *IVarName, ObjCInterfaceDecl *&ClassDeclared)
Definition: DeclObjC.cpp:621
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:904
ObjCMethodDecl * getImplicitPropertyGetter() const
Definition: ExprObjC.h:675
bool isInvalid() const
Definition: Ownership.h:170
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:1789
bool isInstanceMethod() const
Definition: DeclObjC.h:414
ArraySizeModifier getSizeModifier() const
Definition: Type.h:2845
bool rewriteObjCRedundantCallWithLiteral(const ObjCMessageExpr *Msg, const NSAPI &NS, Commit &commit)
unsigned getNumArgs() const
ValueDecl * getDecl()
Definition: Expr.h:1061
bool isUsable() const
Definition: Ownership.h:171
Selector getSelector() const
Definition: DeclObjC.h:321
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:1402
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:467
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:3039
bool isNull() const
Return true if this QualType doesn&#39;t point to a type yet.
Definition: Type.h:707
ImplicitParamDecl * getSelfDecl() const
Definition: DeclObjC.h:406
const SourceManager & SM
Definition: Format.cpp:1490
SourceLocation getEndLoc() const LLVM_READONLY
Definition: Stmt.cpp:293
static InitializationKind CreateCopy(SourceLocation InitLoc, SourceLocation EqualLoc, bool AllowExplicitConvs=false)
Create a copy initialization.
QualType getAttributedType(attr::Kind attrKind, QualType modifiedType, QualType equivalentType)
bool isConstQualified() const
Determine whether this type is const-qualified.
Definition: Type.h:6105
ExprResult ParseObjCProtocolExpression(IdentifierInfo *ProtocolName, SourceLocation AtLoc, SourceLocation ProtoLoc, SourceLocation LParenLoc, SourceLocation ProtoIdLoc, SourceLocation RParenLoc)
ParseObjCProtocolExpression - Build protocol expression for @protocol.
QualType getWideCharType() const
Return the type of wide characters.
Definition: ASTContext.h:1571
There is no lifetime qualification on this type.
Definition: Type.h:158
static bool isMethodDeclaredInRootProtocol(Sema &S, const ObjCMethodDecl *M)
std::string getAsString() const
Derive the full selector name (e.g.
ARCConversionResult
Definition: Sema.h:9769
SelectorTable & Selectors
Definition: ASTContext.h:566
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:157
PseudoObjectExpr - An expression which accesses a pseudo-object l-value.
Definition: Expr.h:5101
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:3366
Encodes a location in the source.
ObjCInterfaceDecl * getDecl() const
Get the declaration of this interface.
Definition: Type.h:5725
Sugar for parentheses used when specifying types.
Definition: Type.h:2503
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:4372
Expr * getSubExpr() const
Definition: Expr.h:1816
Represents typeof(type), a GCC extension.
Definition: Type.h:4195
Interfaces are the core concept in Objective-C for object oriented design.
Definition: Type.h:5712
CastKind getCastKind() const
Definition: Expr.h:2854
std::string getNameAsString() const
Get a human-readable name for the declaration, even if it is one of the special kinds of names (C++ c...
Definition: Decl.h:291
ObjCMethodFamily getMethodFamily() const
Definition: ExprObjC.h:1322
MutableArrayRef< Expr * > MultiExprArg
Definition: Ownership.h:277
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:373
QualType getObjCSelType() const
Retrieve the type that corresponds to the predefined Objective-C &#39;SEL&#39; type.
Definition: ASTContext.h:1865
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:144
bool isIntegralType(const ASTContext &Ctx) const
Determine whether this type is an integral type.
Definition: Type.cpp:1751
const ConstantArrayType * getAsConstantArrayType(QualType T) const
Definition: ASTContext.h:2419
StmtVisitor - This class implements a simple visitor for Stmt subclasses.
Definition: StmtVisitor.h:186
ExprResult BuildObjCArrayLiteral(SourceRange SR, MultiExprArg Elements)
ExprResult DefaultLvalueConversion(Expr *E)
Definition: SemaExpr.cpp:545
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:69
static bool isCast(CheckedConversionKind CCK)
Definition: Sema.h:9350
Specifies that a value-dependent expression should be considered to never be a null pointer constant...
Definition: Expr.h:717
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...
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Expr.h:1717
ExprResult ActOnClassPropertyRefExpr(IdentifierInfo &receiverName, IdentifierInfo &propertyName, SourceLocation receiverNameLoc, SourceLocation propertyNameLoc)
bool isObjCObjectPointerType() const
Definition: Type.h:6367
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:721
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:1802
No entity found met the criteria.
Definition: Lookup.h:51
bool ObjCIsDesignatedInit
True when this is a method marked as a designated initializer.
Definition: ScopeInfo.h:139
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:1303
bool isVectorType() const
Definition: Type.h:6355
StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}).
Definition: Expr.h:3616
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:285
ExprResult ParseObjCSelectorExpression(Selector Sel, SourceLocation AtLoc, SourceLocation SelLoc, SourceLocation LParenLoc, SourceLocation RParenLoc, bool WarnMultipleSelectors)
ParseObjCSelectorExpression - Build selector expression for @selector.
bool hasSameUnqualifiedType(QualType T1, QualType T2) const
Determine whether the given types are equivalent after cvr-qualifiers have been removed.
Definition: ASTContext.h:2299
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:840
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:1736
Represents a C11 generic selection.
Definition: Expr.h:4812
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:1575
Base class for declarations which introduce a typedef-name.
Definition: Decl.h:2908
Expr * getResultExpr()
Return the result-bearing expression, or null if there is none.
Definition: Expr.h:5156
CanQualType CharTy
Definition: ASTContext.h:1027
ExprResult PerformCopyInitialization(const InitializedEntity &Entity, SourceLocation EqualLoc, ExprResult Init, bool TopLevelOfInitList=false, bool AllowExplicit=false)
Definition: SemaInit.cpp:9094
CanQualType ObjCBuiltinIdTy
Definition: ASTContext.h:1057
static ParmVarDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, SourceLocation IdLoc, IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo, StorageClass S, Expr *DefArg)
Definition: Decl.cpp:2535
Dataflow Directional Tag Classes.
bool isValid() const
Return true if this is a valid SourceLocation object.
tokloc_iterator tokloc_begin() const
Definition: Expr.h:1714
ObjCMethodDecl * lookupPrivateMethod(const Selector &Sel, bool Instance=true) const
Lookup a method in the classes implementation hierarchy.
Definition: DeclObjC.cpp:740
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:236
DeclContext - This is used only as base class of specific decl types that can act as declaration cont...
Definition: DeclBase.h:1261
ObjCMethodDecl * NSNumberLiteralMethods[NSAPI::NumNSNumberLiteralMethods]
The Objective-C NSNumber methods used to create NSNumber literals.
Definition: Sema.h:862
static bool GetFormatNSStringIdx(const FormatAttr *Format, unsigned &Idx)
FunctionDecl * getDirectCallee()
If the callee is a FunctionDecl, return it. Otherwise return 0.
Definition: Expr.cpp:1251
bool isCommitable() const
Definition: Commit.h:69
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:37
bool ObjCIsSecondaryInit
True when this is an initializer method not marked as a designated initializer within a class that ha...
Definition: ScopeInfo.h:149
QualType getUnderlyingType() const
Definition: Decl.h:2963
static FixItHint CreateRemoval(CharSourceRange RemoveRange)
Create a code modification hint that removes the given source range.
Definition: Diagnostic.h:118
The name of a declaration.
NamedDecl * getFoundDecl() const
Fetch the unique decl found by this lookup.
Definition: Lookup.h:506
static std::string getAsString(SplitQualType split, const PrintingPolicy &Policy)
Definition: Type.h:975
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:153
ExplicitCastExpr - An explicit cast written in the source code.
Definition: Expr.h:3005
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.
Definition: