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  PDecl = PDecl->getDefinition();
1232 
1233  QualType Ty = Context.getObjCProtoType();
1234  if (Ty.isNull())
1235  return true;
1236  Ty = Context.getObjCObjectPointerType(Ty);
1237  return new (Context) ObjCProtocolExpr(Ty, PDecl, AtLoc, ProtoIdLoc, RParenLoc);
1238 }
1239 
1240 /// Try to capture an implicit reference to 'self'.
1242  DeclContext *DC = getFunctionLevelDeclContext();
1243 
1244  // If we're not in an ObjC method, error out. Note that, unlike the
1245  // C++ case, we don't require an instance method --- class methods
1246  // still have a 'self', and we really do still need to capture it!
1247  ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(DC);
1248  if (!method)
1249  return nullptr;
1250 
1251  tryCaptureVariable(method->getSelfDecl(), Loc);
1252 
1253  return method;
1254 }
1255 
1257  QualType origType = T;
1258  if (auto nullability = AttributedType::stripOuterNullability(T)) {
1259  if (T == Context.getObjCInstanceType()) {
1260  return Context.getAttributedType(
1262  Context.getObjCIdType(),
1263  Context.getObjCIdType());
1264  }
1265 
1266  return origType;
1267  }
1268 
1269  if (T == Context.getObjCInstanceType())
1270  return Context.getObjCIdType();
1271 
1272  return origType;
1273 }
1274 
1275 /// Determine the result type of a message send based on the receiver type,
1276 /// method, and the kind of message send.
1277 ///
1278 /// This is the "base" result type, which will still need to be adjusted
1279 /// to account for nullability.
1281  QualType ReceiverType,
1282  ObjCMethodDecl *Method,
1283  bool isClassMessage,
1284  bool isSuperMessage) {
1285  assert(Method && "Must have a method");
1286  if (!Method->hasRelatedResultType())
1287  return Method->getSendResultType(ReceiverType);
1288 
1289  ASTContext &Context = S.Context;
1290 
1291  // Local function that transfers the nullability of the method's
1292  // result type to the returned result.
1293  auto transferNullability = [&](QualType type) -> QualType {
1294  // If the method's result type has nullability, extract it.
1295  if (auto nullability = Method->getSendResultType(ReceiverType)
1296  ->getNullability(Context)){
1297  // Strip off any outer nullability sugar from the provided type.
1299 
1300  // Form a new attributed type using the method result type's nullability.
1301  return Context.getAttributedType(
1303  type,
1304  type);
1305  }
1306 
1307  return type;
1308  };
1309 
1310  // If a method has a related return type:
1311  // - if the method found is an instance method, but the message send
1312  // was a class message send, T is the declared return type of the method
1313  // found
1314  if (Method->isInstanceMethod() && isClassMessage)
1315  return stripObjCInstanceType(Context,
1316  Method->getSendResultType(ReceiverType));
1317 
1318  // - if the receiver is super, T is a pointer to the class of the
1319  // enclosing method definition
1320  if (isSuperMessage) {
1321  if (ObjCMethodDecl *CurMethod = S.getCurMethodDecl())
1322  if (ObjCInterfaceDecl *Class = CurMethod->getClassInterface()) {
1323  return transferNullability(
1324  Context.getObjCObjectPointerType(
1325  Context.getObjCInterfaceType(Class)));
1326  }
1327  }
1328 
1329  // - if the receiver is the name of a class U, T is a pointer to U
1330  if (ReceiverType->getAsObjCInterfaceType())
1331  return transferNullability(Context.getObjCObjectPointerType(ReceiverType));
1332  // - if the receiver is of type Class or qualified Class type,
1333  // T is the declared return type of the method.
1334  if (ReceiverType->isObjCClassType() ||
1335  ReceiverType->isObjCQualifiedClassType())
1336  return stripObjCInstanceType(Context,
1337  Method->getSendResultType(ReceiverType));
1338 
1339  // - if the receiver is id, qualified id, Class, or qualified Class, T
1340  // is the receiver type, otherwise
1341  // - T is the type of the receiver expression.
1342  return transferNullability(ReceiverType);
1343 }
1344 
1346  ObjCMethodDecl *Method,
1347  bool isClassMessage,
1348  bool isSuperMessage) {
1349  // Produce the result type.
1350  QualType resultType = getBaseMessageSendResultType(*this, ReceiverType,
1351  Method,
1352  isClassMessage,
1353  isSuperMessage);
1354 
1355  // If this is a class message, ignore the nullability of the receiver.
1356  if (isClassMessage)
1357  return resultType;
1358 
1359  // There is nothing left to do if the result type cannot have a nullability
1360  // specifier.
1361  if (!resultType->canHaveNullability())
1362  return resultType;
1363 
1364  // Map the nullability of the result into a table index.
1365  unsigned receiverNullabilityIdx = 0;
1366  if (auto nullability = ReceiverType->getNullability(Context))
1367  receiverNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1368 
1369  unsigned resultNullabilityIdx = 0;
1370  if (auto nullability = resultType->getNullability(Context))
1371  resultNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1372 
1373  // The table of nullability mappings, indexed by the receiver's nullability
1374  // and then the result type's nullability.
1375  static const uint8_t None = 0;
1376  static const uint8_t NonNull = 1;
1377  static const uint8_t Nullable = 2;
1378  static const uint8_t Unspecified = 3;
1379  static const uint8_t nullabilityMap[4][4] = {
1380  // None NonNull Nullable Unspecified
1381  /* None */ { None, None, Nullable, None },
1382  /* NonNull */ { None, NonNull, Nullable, Unspecified },
1383  /* Nullable */ { Nullable, Nullable, Nullable, Nullable },
1384  /* Unspecified */ { None, Unspecified, Nullable, Unspecified }
1385  };
1386 
1387  unsigned newResultNullabilityIdx
1388  = nullabilityMap[receiverNullabilityIdx][resultNullabilityIdx];
1389  if (newResultNullabilityIdx == resultNullabilityIdx)
1390  return resultType;
1391 
1392  // Strip off the existing nullability. This removes as little type sugar as
1393  // possible.
1394  do {
1395  if (auto attributed = dyn_cast<AttributedType>(resultType.getTypePtr())) {
1396  resultType = attributed->getModifiedType();
1397  } else {
1398  resultType = resultType.getDesugaredType(Context);
1399  }
1400  } while (resultType->getNullability(Context));
1401 
1402  // Add nullability back if needed.
1403  if (newResultNullabilityIdx > 0) {
1404  auto newNullability
1405  = static_cast<NullabilityKind>(newResultNullabilityIdx-1);
1406  return Context.getAttributedType(
1408  resultType, resultType);
1409  }
1410 
1411  return resultType;
1412 }
1413 
1414 /// Look for an ObjC method whose result type exactly matches the given type.
1415 static const ObjCMethodDecl *
1417  QualType instancetype) {
1418  if (MD->getReturnType() == instancetype)
1419  return MD;
1420 
1421  // For these purposes, a method in an @implementation overrides a
1422  // declaration in the @interface.
1423  if (const ObjCImplDecl *impl =
1424  dyn_cast<ObjCImplDecl>(MD->getDeclContext())) {
1425  const ObjCContainerDecl *iface;
1426  if (const ObjCCategoryImplDecl *catImpl =
1427  dyn_cast<ObjCCategoryImplDecl>(impl)) {
1428  iface = catImpl->getCategoryDecl();
1429  } else {
1430  iface = impl->getClassInterface();
1431  }
1432 
1433  const ObjCMethodDecl *ifaceMD =
1434  iface->getMethod(MD->getSelector(), MD->isInstanceMethod());
1435  if (ifaceMD) return findExplicitInstancetypeDeclarer(ifaceMD, instancetype);
1436  }
1437 
1439  MD->getOverriddenMethods(overrides);
1440  for (unsigned i = 0, e = overrides.size(); i != e; ++i) {
1441  if (const ObjCMethodDecl *result =
1442  findExplicitInstancetypeDeclarer(overrides[i], instancetype))
1443  return result;
1444  }
1445 
1446  return nullptr;
1447 }
1448 
1450  // Only complain if we're in an ObjC method and the required return
1451  // type doesn't match the method's declared return type.
1452  ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurContext);
1453  if (!MD || !MD->hasRelatedResultType() ||
1454  Context.hasSameUnqualifiedType(destType, MD->getReturnType()))
1455  return;
1456 
1457  // Look for a method overridden by this method which explicitly uses
1458  // 'instancetype'.
1459  if (const ObjCMethodDecl *overridden =
1461  SourceRange range = overridden->getReturnTypeSourceRange();
1462  SourceLocation loc = range.getBegin();
1463  if (loc.isInvalid())
1464  loc = overridden->getLocation();
1465  Diag(loc, diag::note_related_result_type_explicit)
1466  << /*current method*/ 1 << range;
1467  return;
1468  }
1469 
1470  // Otherwise, if we have an interesting method family, note that.
1471  // This should always trigger if the above didn't.
1472  if (ObjCMethodFamily family = MD->getMethodFamily())
1473  Diag(MD->getLocation(), diag::note_related_result_type_family)
1474  << /*current method*/ 1
1475  << family;
1476 }
1477 
1479  E = E->IgnoreParenImpCasts();
1480  const ObjCMessageExpr *MsgSend = dyn_cast<ObjCMessageExpr>(E);
1481  if (!MsgSend)
1482  return;
1483 
1484  const ObjCMethodDecl *Method = MsgSend->getMethodDecl();
1485  if (!Method)
1486  return;
1487 
1488  if (!Method->hasRelatedResultType())
1489  return;
1490 
1491  if (Context.hasSameUnqualifiedType(
1492  Method->getReturnType().getNonReferenceType(), MsgSend->getType()))
1493  return;
1494 
1495  if (!Context.hasSameUnqualifiedType(Method->getReturnType(),
1496  Context.getObjCInstanceType()))
1497  return;
1498 
1499  Diag(Method->getLocation(), diag::note_related_result_type_inferred)
1500  << Method->isInstanceMethod() << Method->getSelector()
1501  << MsgSend->getType();
1502 }
1503 
1505  MultiExprArg Args,
1506  Selector Sel,
1507  ArrayRef<SourceLocation> SelectorLocs,
1508  ObjCMethodDecl *Method,
1509  bool isClassMessage, bool isSuperMessage,
1510  SourceLocation lbrac, SourceLocation rbrac,
1511  SourceRange RecRange,
1512  QualType &ReturnType, ExprValueKind &VK) {
1513  SourceLocation SelLoc;
1514  if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
1515  SelLoc = SelectorLocs.front();
1516  else
1517  SelLoc = lbrac;
1518 
1519  if (!Method) {
1520  // Apply default argument promotion as for (C99 6.5.2.2p6).
1521  for (unsigned i = 0, e = Args.size(); i != e; i++) {
1522  if (Args[i]->isTypeDependent())
1523  continue;
1524 
1525  ExprResult result;
1526  if (getLangOpts().DebuggerSupport) {
1527  QualType paramTy; // ignored
1528  result = checkUnknownAnyArg(SelLoc, Args[i], paramTy);
1529  } else {
1530  result = DefaultArgumentPromotion(Args[i]);
1531  }
1532  if (result.isInvalid())
1533  return true;
1534  Args[i] = result.get();
1535  }
1536 
1537  unsigned DiagID;
1538  if (getLangOpts().ObjCAutoRefCount)
1539  DiagID = diag::err_arc_method_not_found;
1540  else
1541  DiagID = isClassMessage ? diag::warn_class_method_not_found
1542  : diag::warn_inst_method_not_found;
1543  if (!getLangOpts().DebuggerSupport) {
1544  const ObjCMethodDecl *OMD = SelectorsForTypoCorrection(Sel, ReceiverType);
1545  if (OMD && !OMD->isInvalidDecl()) {
1546  if (getLangOpts().ObjCAutoRefCount)
1547  DiagID = diag::err_method_not_found_with_typo;
1548  else
1549  DiagID = isClassMessage ? diag::warn_class_method_not_found_with_typo
1550  : diag::warn_instance_method_not_found_with_typo;
1551  Selector MatchedSel = OMD->getSelector();
1552  SourceRange SelectorRange(SelectorLocs.front(), SelectorLocs.back());
1553  if (MatchedSel.isUnarySelector())
1554  Diag(SelLoc, DiagID)
1555  << Sel<< isClassMessage << MatchedSel
1556  << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1557  else
1558  Diag(SelLoc, DiagID) << Sel<< isClassMessage << MatchedSel;
1559  }
1560  else
1561  Diag(SelLoc, DiagID)
1562  << Sel << isClassMessage << SourceRange(SelectorLocs.front(),
1563  SelectorLocs.back());
1564  // Find the class to which we are sending this message.
1565  if (ReceiverType->isObjCObjectPointerType()) {
1566  if (ObjCInterfaceDecl *ThisClass =
1567  ReceiverType->getAs<ObjCObjectPointerType>()->getInterfaceDecl()) {
1568  Diag(ThisClass->getLocation(), diag::note_receiver_class_declared);
1569  if (!RecRange.isInvalid())
1570  if (ThisClass->lookupClassMethod(Sel))
1571  Diag(RecRange.getBegin(),diag::note_receiver_expr_here)
1572  << FixItHint::CreateReplacement(RecRange,
1573  ThisClass->getNameAsString());
1574  }
1575  }
1576  }
1577 
1578  // In debuggers, we want to use __unknown_anytype for these
1579  // results so that clients can cast them.
1580  if (getLangOpts().DebuggerSupport) {
1581  ReturnType = Context.UnknownAnyTy;
1582  } else {
1583  ReturnType = Context.getObjCIdType();
1584  }
1585  VK = VK_RValue;
1586  return false;
1587  }
1588 
1589  ReturnType = getMessageSendResultType(ReceiverType, Method, isClassMessage,
1590  isSuperMessage);
1591  VK = Expr::getValueKindForType(Method->getReturnType());
1592 
1593  unsigned NumNamedArgs = Sel.getNumArgs();
1594  // Method might have more arguments than selector indicates. This is due
1595  // to addition of c-style arguments in method.
1596  if (Method->param_size() > Sel.getNumArgs())
1597  NumNamedArgs = Method->param_size();
1598  // FIXME. This need be cleaned up.
1599  if (Args.size() < NumNamedArgs) {
1600  Diag(SelLoc, diag::err_typecheck_call_too_few_args)
1601  << 2 << NumNamedArgs << static_cast<unsigned>(Args.size());
1602  return false;
1603  }
1604 
1605  // Compute the set of type arguments to be substituted into each parameter
1606  // type.
1607  Optional<ArrayRef<QualType>> typeArgs
1608  = ReceiverType->getObjCSubstitutions(Method->getDeclContext());
1609  bool IsError = false;
1610  for (unsigned i = 0; i < NumNamedArgs; i++) {
1611  // We can't do any type-checking on a type-dependent argument.
1612  if (Args[i]->isTypeDependent())
1613  continue;
1614 
1615  Expr *argExpr = Args[i];
1616 
1617  ParmVarDecl *param = Method->parameters()[i];
1618  assert(argExpr && "CheckMessageArgumentTypes(): missing expression");
1619 
1620  if (param->hasAttr<NoEscapeAttr>())
1621  if (auto *BE = dyn_cast<BlockExpr>(
1622  argExpr->IgnoreParenNoopCasts(Context)))
1623  BE->getBlockDecl()->setDoesNotEscape();
1624 
1625  // Strip the unbridged-cast placeholder expression off unless it's
1626  // a consumed argument.
1627  if (argExpr->hasPlaceholderType(BuiltinType::ARCUnbridgedCast) &&
1628  !param->hasAttr<CFConsumedAttr>())
1629  argExpr = stripARCUnbridgedCast(argExpr);
1630 
1631  // If the parameter is __unknown_anytype, infer its type
1632  // from the argument.
1633  if (param->getType() == Context.UnknownAnyTy) {
1634  QualType paramType;
1635  ExprResult argE = checkUnknownAnyArg(SelLoc, argExpr, paramType);
1636  if (argE.isInvalid()) {
1637  IsError = true;
1638  } else {
1639  Args[i] = argE.get();
1640 
1641  // Update the parameter type in-place.
1642  param->setType(paramType);
1643  }
1644  continue;
1645  }
1646 
1647  QualType origParamType = param->getType();
1648  QualType paramType = param->getType();
1649  if (typeArgs)
1650  paramType = paramType.substObjCTypeArgs(
1651  Context,
1652  *typeArgs,
1654 
1655  if (RequireCompleteType(argExpr->getSourceRange().getBegin(),
1656  paramType,
1657  diag::err_call_incomplete_argument, argExpr))
1658  return true;
1659 
1660  InitializedEntity Entity
1661  = InitializedEntity::InitializeParameter(Context, param, paramType);
1662  ExprResult ArgE = PerformCopyInitialization(Entity, SourceLocation(), argExpr);
1663  if (ArgE.isInvalid())
1664  IsError = true;
1665  else {
1666  Args[i] = ArgE.getAs<Expr>();
1667 
1668  // If we are type-erasing a block to a block-compatible
1669  // Objective-C pointer type, we may need to extend the lifetime
1670  // of the block object.
1671  if (typeArgs && Args[i]->isRValue() && paramType->isBlockPointerType() &&
1672  Args[i]->getType()->isBlockPointerType() &&
1673  origParamType->isObjCObjectPointerType()) {
1674  ExprResult arg = Args[i];
1675  maybeExtendBlockObject(arg);
1676  Args[i] = arg.get();
1677  }
1678  }
1679  }
1680 
1681  // Promote additional arguments to variadic methods.
1682  if (Method->isVariadic()) {
1683  for (unsigned i = NumNamedArgs, e = Args.size(); i < e; ++i) {
1684  if (Args[i]->isTypeDependent())
1685  continue;
1686 
1687  ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], VariadicMethod,
1688  nullptr);
1689  IsError |= Arg.isInvalid();
1690  Args[i] = Arg.get();
1691  }
1692  } else {
1693  // Check for extra arguments to non-variadic methods.
1694  if (Args.size() != NumNamedArgs) {
1695  Diag(Args[NumNamedArgs]->getBeginLoc(),
1696  diag::err_typecheck_call_too_many_args)
1697  << 2 /*method*/ << NumNamedArgs << static_cast<unsigned>(Args.size())
1698  << Method->getSourceRange()
1699  << SourceRange(Args[NumNamedArgs]->getBeginLoc(),
1700  Args.back()->getEndLoc());
1701  }
1702  }
1703 
1704  DiagnoseSentinelCalls(Method, SelLoc, Args);
1705 
1706  // Do additional checkings on method.
1707  IsError |= CheckObjCMethodCall(
1708  Method, SelLoc, makeArrayRef(Args.data(), Args.size()));
1709 
1710  return IsError;
1711 }
1712 
1713 bool Sema::isSelfExpr(Expr *RExpr) {
1714  // 'self' is objc 'self' in an objc method only.
1715  ObjCMethodDecl *Method =
1716  dyn_cast_or_null<ObjCMethodDecl>(CurContext->getNonClosureAncestor());
1717  return isSelfExpr(RExpr, Method);
1718 }
1719 
1720 bool Sema::isSelfExpr(Expr *receiver, const ObjCMethodDecl *method) {
1721  if (!method) return false;
1722 
1723  receiver = receiver->IgnoreParenLValueCasts();
1724  if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(receiver))
1725  if (DRE->getDecl() == method->getSelfDecl())
1726  return true;
1727  return false;
1728 }
1729 
1730 /// LookupMethodInType - Look up a method in an ObjCObjectType.
1732  bool isInstance) {
1733  const ObjCObjectType *objType = type->castAs<ObjCObjectType>();
1734  if (ObjCInterfaceDecl *iface = objType->getInterface()) {
1735  // Look it up in the main interface (and categories, etc.)
1736  if (ObjCMethodDecl *method = iface->lookupMethod(sel, isInstance))
1737  return method;
1738 
1739  // Okay, look for "private" methods declared in any
1740  // @implementations we've seen.
1741  if (ObjCMethodDecl *method = iface->lookupPrivateMethod(sel, isInstance))
1742  return method;
1743  }
1744 
1745  // Check qualifiers.
1746  for (const auto *I : objType->quals())
1747  if (ObjCMethodDecl *method = I->lookupMethod(sel, isInstance))
1748  return method;
1749 
1750  return nullptr;
1751 }
1752 
1753 /// LookupMethodInQualifiedType - Lookups up a method in protocol qualifier
1754 /// list of a qualified objective pointer type.
1756  const ObjCObjectPointerType *OPT,
1757  bool Instance)
1758 {
1759  ObjCMethodDecl *MD = nullptr;
1760  for (const auto *PROTO : OPT->quals()) {
1761  if ((MD = PROTO->lookupMethod(Sel, Instance))) {
1762  return MD;
1763  }
1764  }
1765  return nullptr;
1766 }
1767 
1768 /// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an
1769 /// objective C interface. This is a property reference expression.
1772  Expr *BaseExpr, SourceLocation OpLoc,
1773  DeclarationName MemberName,
1774  SourceLocation MemberLoc,
1775  SourceLocation SuperLoc, QualType SuperType,
1776  bool Super) {
1777  const ObjCInterfaceType *IFaceT = OPT->getInterfaceType();
1778  ObjCInterfaceDecl *IFace = IFaceT->getDecl();
1779 
1780  if (!MemberName.isIdentifier()) {
1781  Diag(MemberLoc, diag::err_invalid_property_name)
1782  << MemberName << QualType(OPT, 0);
1783  return ExprError();
1784  }
1785 
1786  IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
1787 
1788  SourceRange BaseRange = Super? SourceRange(SuperLoc)
1789  : BaseExpr->getSourceRange();
1790  if (RequireCompleteType(MemberLoc, OPT->getPointeeType(),
1791  diag::err_property_not_found_forward_class,
1792  MemberName, BaseRange))
1793  return ExprError();
1794 
1795  if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(
1797  // Check whether we can reference this property.
1798  if (DiagnoseUseOfDecl(PD, MemberLoc))
1799  return ExprError();
1800  if (Super)
1801  return new (Context)
1803  OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1804  else
1805  return new (Context)
1807  OK_ObjCProperty, MemberLoc, BaseExpr);
1808  }
1809  // Check protocols on qualified interfaces.
1810  for (const auto *I : OPT->quals())
1811  if (ObjCPropertyDecl *PD = I->FindPropertyDeclaration(
1813  // Check whether we can reference this property.
1814  if (DiagnoseUseOfDecl(PD, MemberLoc))
1815  return ExprError();
1816 
1817  if (Super)
1818  return new (Context) ObjCPropertyRefExpr(
1819  PD, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty, MemberLoc,
1820  SuperLoc, SuperType);
1821  else
1822  return new (Context)
1824  OK_ObjCProperty, MemberLoc, BaseExpr);
1825  }
1826  // If that failed, look for an "implicit" property by seeing if the nullary
1827  // selector is implemented.
1828 
1829  // FIXME: The logic for looking up nullary and unary selectors should be
1830  // shared with the code in ActOnInstanceMessage.
1831 
1832  Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
1833  ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
1834 
1835  // May be found in property's qualified list.
1836  if (!Getter)
1837  Getter = LookupMethodInQualifiedType(Sel, OPT, true);
1838 
1839  // If this reference is in an @implementation, check for 'private' methods.
1840  if (!Getter)
1841  Getter = IFace->lookupPrivateMethod(Sel);
1842 
1843  if (Getter) {
1844  // Check if we can reference this property.
1845  if (DiagnoseUseOfDecl(Getter, MemberLoc))
1846  return ExprError();
1847  }
1848  // If we found a getter then this may be a valid dot-reference, we
1849  // will look for the matching setter, in case it is needed.
1850  Selector SetterSel =
1851  SelectorTable::constructSetterSelector(PP.getIdentifierTable(),
1852  PP.getSelectorTable(), Member);
1853  ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel);
1854 
1855  // May be found in property's qualified list.
1856  if (!Setter)
1857  Setter = LookupMethodInQualifiedType(SetterSel, OPT, true);
1858 
1859  if (!Setter) {
1860  // If this reference is in an @implementation, also check for 'private'
1861  // methods.
1862  Setter = IFace->lookupPrivateMethod(SetterSel);
1863  }
1864 
1865  if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc))
1866  return ExprError();
1867 
1868  // Special warning if member name used in a property-dot for a setter accessor
1869  // does not use a property with same name; e.g. obj.X = ... for a property with
1870  // name 'x'.
1871  if (Setter && Setter->isImplicit() && Setter->isPropertyAccessor() &&
1872  !IFace->FindPropertyDeclaration(
1874  if (const ObjCPropertyDecl *PDecl = Setter->findPropertyDecl()) {
1875  // Do not warn if user is using property-dot syntax to make call to
1876  // user named setter.
1877  if (!(PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter))
1878  Diag(MemberLoc,
1879  diag::warn_property_access_suggest)
1880  << MemberName << QualType(OPT, 0) << PDecl->getName()
1881  << FixItHint::CreateReplacement(MemberLoc, PDecl->getName());
1882  }
1883  }
1884 
1885  if (Getter || Setter) {
1886  if (Super)
1887  return new (Context)
1888  ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1889  OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1890  else
1891  return new (Context)
1892  ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1893  OK_ObjCProperty, MemberLoc, BaseExpr);
1894 
1895  }
1896 
1897  // Attempt to correct for typos in property names.
1898  if (TypoCorrection Corrected =
1899  CorrectTypo(DeclarationNameInfo(MemberName, MemberLoc),
1900  LookupOrdinaryName, nullptr, nullptr,
1901  llvm::make_unique<DeclFilterCCC<ObjCPropertyDecl>>(),
1902  CTK_ErrorRecovery, IFace, false, OPT)) {
1903  DeclarationName TypoResult = Corrected.getCorrection();
1904  if (TypoResult.isIdentifier() &&
1905  TypoResult.getAsIdentifierInfo() == Member) {
1906  // There is no need to try the correction if it is the same.
1907  NamedDecl *ChosenDecl =
1908  Corrected.isKeyword() ? nullptr : Corrected.getFoundDecl();
1909  if (ChosenDecl && isa<ObjCPropertyDecl>(ChosenDecl))
1910  if (cast<ObjCPropertyDecl>(ChosenDecl)->isClassProperty()) {
1911  // This is a class property, we should not use the instance to
1912  // access it.
1913  Diag(MemberLoc, diag::err_class_property_found) << MemberName
1914  << OPT->getInterfaceDecl()->getName()
1916  OPT->getInterfaceDecl()->getName());
1917  return ExprError();
1918  }
1919  } else {
1920  diagnoseTypo(Corrected, PDiag(diag::err_property_not_found_suggest)
1921  << MemberName << QualType(OPT, 0));
1922  return HandleExprPropertyRefExpr(OPT, BaseExpr, OpLoc,
1923  TypoResult, MemberLoc,
1924  SuperLoc, SuperType, Super);
1925  }
1926  }
1927  ObjCInterfaceDecl *ClassDeclared;
1928  if (ObjCIvarDecl *Ivar =
1929  IFace->lookupInstanceVariable(Member, ClassDeclared)) {
1930  QualType T = Ivar->getType();
1931  if (const ObjCObjectPointerType * OBJPT =
1933  if (RequireCompleteType(MemberLoc, OBJPT->getPointeeType(),
1934  diag::err_property_not_as_forward_class,
1935  MemberName, BaseExpr))
1936  return ExprError();
1937  }
1938  Diag(MemberLoc,
1939  diag::err_ivar_access_using_property_syntax_suggest)
1940  << MemberName << QualType(OPT, 0) << Ivar->getDeclName()
1941  << FixItHint::CreateReplacement(OpLoc, "->");
1942  return ExprError();
1943  }
1944 
1945  Diag(MemberLoc, diag::err_property_not_found)
1946  << MemberName << QualType(OPT, 0);
1947  if (Setter)
1948  Diag(Setter->getLocation(), diag::note_getter_unavailable)
1949  << MemberName << BaseExpr->getSourceRange();
1950  return ExprError();
1951 }
1952 
1955  IdentifierInfo &propertyName,
1956  SourceLocation receiverNameLoc,
1957  SourceLocation propertyNameLoc) {
1958 
1959  IdentifierInfo *receiverNamePtr = &receiverName;
1960  ObjCInterfaceDecl *IFace = getObjCInterfaceDecl(receiverNamePtr,
1961  receiverNameLoc);
1962 
1963  QualType SuperType;
1964  if (!IFace) {
1965  // If the "receiver" is 'super' in a method, handle it as an expression-like
1966  // property reference.
1967  if (receiverNamePtr->isStr("super")) {
1968  if (ObjCMethodDecl *CurMethod = tryCaptureObjCSelf(receiverNameLoc)) {
1969  if (auto classDecl = CurMethod->getClassInterface()) {
1970  SuperType = QualType(classDecl->getSuperClassType(), 0);
1971  if (CurMethod->isInstanceMethod()) {
1972  if (SuperType.isNull()) {
1973  // The current class does not have a superclass.
1974  Diag(receiverNameLoc, diag::err_root_class_cannot_use_super)
1975  << CurMethod->getClassInterface()->getIdentifier();
1976  return ExprError();
1977  }
1978  QualType T = Context.getObjCObjectPointerType(SuperType);
1979 
1980  return HandleExprPropertyRefExpr(T->castAs<ObjCObjectPointerType>(),
1981  /*BaseExpr*/nullptr,
1982  SourceLocation()/*OpLoc*/,
1983  &propertyName,
1984  propertyNameLoc,
1985  receiverNameLoc, T, true);
1986  }
1987 
1988  // Otherwise, if this is a class method, try dispatching to our
1989  // superclass.
1990  IFace = CurMethod->getClassInterface()->getSuperClass();
1991  }
1992  }
1993  }
1994 
1995  if (!IFace) {
1996  Diag(receiverNameLoc, diag::err_expected_either) << tok::identifier
1997  << tok::l_paren;
1998  return ExprError();
1999  }
2000  }
2001 
2002  Selector GetterSel;
2003  Selector SetterSel;
2004  if (auto PD = IFace->FindPropertyDeclaration(
2006  GetterSel = PD->getGetterName();
2007  SetterSel = PD->getSetterName();
2008  } else {
2009  GetterSel = PP.getSelectorTable().getNullarySelector(&propertyName);
2011  PP.getIdentifierTable(), PP.getSelectorTable(), &propertyName);
2012  }
2013 
2014  // Search for a declared property first.
2015  ObjCMethodDecl *Getter = IFace->lookupClassMethod(GetterSel);
2016 
2017  // If this reference is in an @implementation, check for 'private' methods.
2018  if (!Getter)
2019  Getter = IFace->lookupPrivateClassMethod(GetterSel);
2020 
2021  if (Getter) {
2022  // FIXME: refactor/share with ActOnMemberReference().
2023  // Check if we can reference this property.
2024  if (DiagnoseUseOfDecl(Getter, propertyNameLoc))
2025  return ExprError();
2026  }
2027 
2028  // Look for the matching setter, in case it is needed.
2029  ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel);
2030  if (!Setter) {
2031  // If this reference is in an @implementation, also check for 'private'
2032  // methods.
2033  Setter = IFace->lookupPrivateClassMethod(SetterSel);
2034  }
2035  // Look through local category implementations associated with the class.
2036  if (!Setter)
2037  Setter = IFace->getCategoryClassMethod(SetterSel);
2038 
2039  if (Setter && DiagnoseUseOfDecl(Setter, propertyNameLoc))
2040  return ExprError();
2041 
2042  if (Getter || Setter) {
2043  if (!SuperType.isNull())
2044  return new (Context)
2045  ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
2046  OK_ObjCProperty, propertyNameLoc, receiverNameLoc,
2047  SuperType);
2048 
2049  return new (Context) ObjCPropertyRefExpr(
2050  Getter, Setter, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty,
2051  propertyNameLoc, receiverNameLoc, IFace);
2052  }
2053  return ExprError(Diag(propertyNameLoc, diag::err_property_not_found)
2054  << &propertyName << Context.getObjCInterfaceType(IFace));
2055 }
2056 
2057 namespace {
2058 
2059 class ObjCInterfaceOrSuperCCC : public CorrectionCandidateCallback {
2060  public:
2061  ObjCInterfaceOrSuperCCC(ObjCMethodDecl *Method) {
2062  // Determine whether "super" is acceptable in the current context.
2063  if (Method && Method->getClassInterface())
2064  WantObjCSuper = Method->getClassInterface()->getSuperClass();
2065  }
2066 
2067  bool ValidateCandidate(const TypoCorrection &candidate) override {
2068  return candidate.getCorrectionDeclAs<ObjCInterfaceDecl>() ||
2069  candidate.isKeyword("super");
2070  }
2071 };
2072 
2073 } // end anonymous namespace
2074 
2076  IdentifierInfo *Name,
2077  SourceLocation NameLoc,
2078  bool IsSuper,
2079  bool HasTrailingDot,
2080  ParsedType &ReceiverType) {
2081  ReceiverType = nullptr;
2082 
2083  // If the identifier is "super" and there is no trailing dot, we're
2084  // messaging super. If the identifier is "super" and there is a
2085  // trailing dot, it's an instance message.
2086  if (IsSuper && S->isInObjcMethodScope())
2087  return HasTrailingDot? ObjCInstanceMessage : ObjCSuperMessage;
2088 
2089  LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName);
2090  LookupName(Result, S);
2091 
2092  switch (Result.getResultKind()) {
2094  // Normal name lookup didn't find anything. If we're in an
2095  // Objective-C method, look for ivars. If we find one, we're done!
2096  // FIXME: This is a hack. Ivar lookup should be part of normal
2097  // lookup.
2098  if (ObjCMethodDecl *Method = getCurMethodDecl()) {
2099  if (!Method->getClassInterface()) {
2100  // Fall back: let the parser try to parse it as an instance message.
2101  return ObjCInstanceMessage;
2102  }
2103 
2104  ObjCInterfaceDecl *ClassDeclared;
2105  if (Method->getClassInterface()->lookupInstanceVariable(Name,
2106  ClassDeclared))
2107  return ObjCInstanceMessage;
2108  }
2109 
2110  // Break out; we'll perform typo correction below.
2111  break;
2112 
2117  Result.suppressDiagnostics();
2118  return ObjCInstanceMessage;
2119 
2120  case LookupResult::Found: {
2121  // If the identifier is a class or not, and there is a trailing dot,
2122  // it's an instance message.
2123  if (HasTrailingDot)
2124  return ObjCInstanceMessage;
2125  // We found something. If it's a type, then we have a class
2126  // message. Otherwise, it's an instance message.
2127  NamedDecl *ND = Result.getFoundDecl();
2128  QualType T;
2129  if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND))
2130  T = Context.getObjCInterfaceType(Class);
2131  else if (TypeDecl *Type = dyn_cast<TypeDecl>(ND)) {
2132  T = Context.getTypeDeclType(Type);
2133  DiagnoseUseOfDecl(Type, NameLoc);
2134  }
2135  else
2136  return ObjCInstanceMessage;
2137 
2138  // We have a class message, and T is the type we're
2139  // messaging. Build source-location information for it.
2140  TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2141  ReceiverType = CreateParsedType(T, TSInfo);
2142  return ObjCClassMessage;
2143  }
2144  }
2145 
2146  if (TypoCorrection Corrected = CorrectTypo(
2147  Result.getLookupNameInfo(), Result.getLookupKind(), S, nullptr,
2148  llvm::make_unique<ObjCInterfaceOrSuperCCC>(getCurMethodDecl()),
2149  CTK_ErrorRecovery, nullptr, false, nullptr, false)) {
2150  if (Corrected.isKeyword()) {
2151  // If we've found the keyword "super" (the only keyword that would be
2152  // returned by CorrectTypo), this is a send to super.
2153  diagnoseTypo(Corrected,
2154  PDiag(diag::err_unknown_receiver_suggest) << Name);
2155  return ObjCSuperMessage;
2156  } else if (ObjCInterfaceDecl *Class =
2157  Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>()) {
2158  // If we found a declaration, correct when it refers to an Objective-C
2159  // class.
2160  diagnoseTypo(Corrected,
2161  PDiag(diag::err_unknown_receiver_suggest) << Name);
2162  QualType T = Context.getObjCInterfaceType(Class);
2163  TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2164  ReceiverType = CreateParsedType(T, TSInfo);
2165  return ObjCClassMessage;
2166  }
2167  }
2168 
2169  // Fall back: let the parser try to parse it as an instance message.
2170  return ObjCInstanceMessage;
2171 }
2172 
2174  SourceLocation SuperLoc,
2175  Selector Sel,
2176  SourceLocation LBracLoc,
2177  ArrayRef<SourceLocation> SelectorLocs,
2178  SourceLocation RBracLoc,
2179  MultiExprArg Args) {
2180  // Determine whether we are inside a method or not.
2181  ObjCMethodDecl *Method = tryCaptureObjCSelf(SuperLoc);
2182  if (!Method) {
2183  Diag(SuperLoc, diag::err_invalid_receiver_to_message_super);
2184  return ExprError();
2185  }
2186 
2187  ObjCInterfaceDecl *Class = Method->getClassInterface();
2188  if (!Class) {
2189  Diag(SuperLoc, diag::err_no_super_class_message)
2190  << Method->getDeclName();
2191  return ExprError();
2192  }
2193 
2194  QualType SuperTy(Class->getSuperClassType(), 0);
2195  if (SuperTy.isNull()) {
2196  // The current class does not have a superclass.
2197  Diag(SuperLoc, diag::err_root_class_cannot_use_super)
2198  << Class->getIdentifier();
2199  return ExprError();
2200  }
2201 
2202  // We are in a method whose class has a superclass, so 'super'
2203  // is acting as a keyword.
2204  if (Method->getSelector() == Sel)
2205  getCurFunction()->ObjCShouldCallSuper = false;
2206 
2207  if (Method->isInstanceMethod()) {
2208  // Since we are in an instance method, this is an instance
2209  // message to the superclass instance.
2210  SuperTy = Context.getObjCObjectPointerType(SuperTy);
2211  return BuildInstanceMessage(nullptr, SuperTy, SuperLoc,
2212  Sel, /*Method=*/nullptr,
2213  LBracLoc, SelectorLocs, RBracLoc, Args);
2214  }
2215 
2216  // Since we are in a class method, this is a class message to
2217  // the superclass.
2218  return BuildClassMessage(/*ReceiverTypeInfo=*/nullptr,
2219  SuperTy,
2220  SuperLoc, Sel, /*Method=*/nullptr,
2221  LBracLoc, SelectorLocs, RBracLoc, Args);
2222 }
2223 
2225  bool isSuperReceiver,
2226  SourceLocation Loc,
2227  Selector Sel,
2228  ObjCMethodDecl *Method,
2229  MultiExprArg Args) {
2230  TypeSourceInfo *receiverTypeInfo = nullptr;
2231  if (!ReceiverType.isNull())
2232  receiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType);
2233 
2234  return BuildClassMessage(receiverTypeInfo, ReceiverType,
2235  /*SuperLoc=*/isSuperReceiver ? Loc : SourceLocation(),
2236  Sel, Method, Loc, Loc, Loc, Args,
2237  /*isImplicit=*/true);
2238 }
2239 
2240 static void applyCocoaAPICheck(Sema &S, const ObjCMessageExpr *Msg,
2241  unsigned DiagID,
2242  bool (*refactor)(const ObjCMessageExpr *,
2243  const NSAPI &, edit::Commit &)) {
2244  SourceLocation MsgLoc = Msg->getExprLoc();
2245  if (S.Diags.isIgnored(DiagID, MsgLoc))
2246  return;
2247 
2248  SourceManager &SM = S.SourceMgr;
2249  edit::Commit ECommit(SM, S.LangOpts);
2250  if (refactor(Msg,*S.NSAPIObj, ECommit)) {
2251  DiagnosticBuilder Builder = S.Diag(MsgLoc, DiagID)
2252  << Msg->getSelector() << Msg->getSourceRange();
2253  // FIXME: Don't emit diagnostic at all if fixits are non-commitable.
2254  if (!ECommit.isCommitable())
2255  return;
2257  I = ECommit.edit_begin(), E = ECommit.edit_end(); I != E; ++I) {
2258  const edit::Commit::Edit &Edit = *I;
2259  switch (Edit.Kind) {
2262  Edit.Text,
2263  Edit.BeforePrev));
2264  break;
2266  Builder.AddFixItHint(
2268  Edit.getInsertFromRange(SM),
2269  Edit.BeforePrev));
2270  break;
2273  break;
2274  }
2275  }
2276  }
2277 }
2278 
2279 static void checkCocoaAPI(Sema &S, const ObjCMessageExpr *Msg) {
2280  applyCocoaAPICheck(S, Msg, diag::warn_objc_redundant_literal_use,
2282 }
2283 
2285  const ObjCMethodDecl *Method,
2286  ArrayRef<Expr *> Args, QualType ReceiverType,
2287  bool IsClassObjectCall) {
2288  // Check if this is a performSelector method that uses a selector that returns
2289  // a record or a vector type.
2290  if (Method->getSelector().getMethodFamily() != OMF_performSelector ||
2291  Args.empty())
2292  return;
2293  const auto *SE = dyn_cast<ObjCSelectorExpr>(Args[0]->IgnoreParens());
2294  if (!SE)
2295  return;
2296  ObjCMethodDecl *ImpliedMethod;
2297  if (!IsClassObjectCall) {
2298  const auto *OPT = ReceiverType->getAs<ObjCObjectPointerType>();
2299  if (!OPT || !OPT->getInterfaceDecl())
2300  return;
2301  ImpliedMethod =
2302  OPT->getInterfaceDecl()->lookupInstanceMethod(SE->getSelector());
2303  if (!ImpliedMethod)
2304  ImpliedMethod =
2305  OPT->getInterfaceDecl()->lookupPrivateMethod(SE->getSelector());
2306  } else {
2307  const auto *IT = ReceiverType->getAs<ObjCInterfaceType>();
2308  if (!IT)
2309  return;
2310  ImpliedMethod = IT->getDecl()->lookupClassMethod(SE->getSelector());
2311  if (!ImpliedMethod)
2312  ImpliedMethod =
2313  IT->getDecl()->lookupPrivateClassMethod(SE->getSelector());
2314  }
2315  if (!ImpliedMethod)
2316  return;
2317  QualType Ret = ImpliedMethod->getReturnType();
2318  if (Ret->isRecordType() || Ret->isVectorType() || Ret->isExtVectorType()) {
2319  QualType Ret = ImpliedMethod->getReturnType();
2320  S.Diag(Loc, diag::warn_objc_unsafe_perform_selector)
2321  << Method->getSelector()
2322  << (!Ret->isRecordType()
2323  ? /*Vector*/ 2
2324  : Ret->isUnionType() ? /*Union*/ 1 : /*Struct*/ 0);
2325  S.Diag(ImpliedMethod->getBeginLoc(),
2326  diag::note_objc_unsafe_perform_selector_method_declared_here)
2327  << ImpliedMethod->getSelector() << Ret;
2328  }
2329 }
2330 
2331 /// Diagnose use of %s directive in an NSString which is being passed
2332 /// as formatting string to formatting method.
2333 static void
2335  ObjCMethodDecl *Method,
2336  Selector Sel,
2337  Expr **Args, unsigned NumArgs) {
2338  unsigned Idx = 0;
2339  bool Format = false;
2341  if (SFFamily == ObjCStringFormatFamily::SFF_NSString) {
2342  Idx = 0;
2343  Format = true;
2344  }
2345  else if (Method) {
2346  for (const auto *I : Method->specific_attrs<FormatAttr>()) {
2347  if (S.GetFormatNSStringIdx(I, Idx)) {
2348  Format = true;
2349  break;
2350  }
2351  }
2352  }
2353  if (!Format || NumArgs <= Idx)
2354  return;
2355 
2356  Expr *FormatExpr = Args[Idx];
2357  if (ObjCStringLiteral *OSL =
2358  dyn_cast<ObjCStringLiteral>(FormatExpr->IgnoreParenImpCasts())) {
2359  StringLiteral *FormatString = OSL->getString();
2360  if (S.FormatStringHasSArg(FormatString)) {
2361  S.Diag(FormatExpr->getExprLoc(), diag::warn_objc_cdirective_format_string)
2362  << "%s" << 0 << 0;
2363  if (Method)
2364  S.Diag(Method->getLocation(), diag::note_method_declared_at)
2365  << Method->getDeclName();
2366  }
2367  }
2368 }
2369 
2370 /// Build an Objective-C class message expression.
2371 ///
2372 /// This routine takes care of both normal class messages and
2373 /// class messages to the superclass.
2374 ///
2375 /// \param ReceiverTypeInfo Type source information that describes the
2376 /// receiver of this message. This may be NULL, in which case we are
2377 /// sending to the superclass and \p SuperLoc must be a valid source
2378 /// location.
2379 
2380 /// \param ReceiverType The type of the object receiving the
2381 /// message. When \p ReceiverTypeInfo is non-NULL, this is the same
2382 /// type as that refers to. For a superclass send, this is the type of
2383 /// the superclass.
2384 ///
2385 /// \param SuperLoc The location of the "super" keyword in a
2386 /// superclass message.
2387 ///
2388 /// \param Sel The selector to which the message is being sent.
2389 ///
2390 /// \param Method The method that this class message is invoking, if
2391 /// already known.
2392 ///
2393 /// \param LBracLoc The location of the opening square bracket ']'.
2394 ///
2395 /// \param RBracLoc The location of the closing square bracket ']'.
2396 ///
2397 /// \param ArgsIn The message arguments.
2399  QualType ReceiverType,
2400  SourceLocation SuperLoc,
2401  Selector Sel,
2402  ObjCMethodDecl *Method,
2403  SourceLocation LBracLoc,
2404  ArrayRef<SourceLocation> SelectorLocs,
2405  SourceLocation RBracLoc,
2406  MultiExprArg ArgsIn,
2407  bool isImplicit) {
2408  SourceLocation Loc = SuperLoc.isValid()? SuperLoc
2409  : ReceiverTypeInfo->getTypeLoc().getSourceRange().getBegin();
2410  if (LBracLoc.isInvalid()) {
2411  Diag(Loc, diag::err_missing_open_square_message_send)
2412  << FixItHint::CreateInsertion(Loc, "[");
2413  LBracLoc = Loc;
2414  }
2415  ArrayRef<SourceLocation> SelectorSlotLocs;
2416  if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2417  SelectorSlotLocs = SelectorLocs;
2418  else
2419  SelectorSlotLocs = Loc;
2420  SourceLocation SelLoc = SelectorSlotLocs.front();
2421 
2422  if (ReceiverType->isDependentType()) {
2423  // If the receiver type is dependent, we can't type-check anything
2424  // at this point. Build a dependent expression.
2425  unsigned NumArgs = ArgsIn.size();
2426  Expr **Args = ArgsIn.data();
2427  assert(SuperLoc.isInvalid() && "Message to super with dependent type");
2428  return ObjCMessageExpr::Create(
2429  Context, ReceiverType, VK_RValue, LBracLoc, ReceiverTypeInfo, Sel,
2430  SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs), RBracLoc,
2431  isImplicit);
2432  }
2433 
2434  // Find the class to which we are sending this message.
2435  ObjCInterfaceDecl *Class = nullptr;
2436  const ObjCObjectType *ClassType = ReceiverType->getAs<ObjCObjectType>();
2437  if (!ClassType || !(Class = ClassType->getInterface())) {
2438  Diag(Loc, diag::err_invalid_receiver_class_message)
2439  << ReceiverType;
2440  return ExprError();
2441  }
2442  assert(Class && "We don't know which class we're messaging?");
2443  // objc++ diagnoses during typename annotation.
2444  if (!getLangOpts().CPlusPlus)
2445  (void)DiagnoseUseOfDecl(Class, SelectorSlotLocs);
2446  // Find the method we are messaging.
2447  if (!Method) {
2448  SourceRange TypeRange
2449  = SuperLoc.isValid()? SourceRange(SuperLoc)
2450  : ReceiverTypeInfo->getTypeLoc().getSourceRange();
2451  if (RequireCompleteType(Loc, Context.getObjCInterfaceType(Class),
2452  (getLangOpts().ObjCAutoRefCount
2453  ? diag::err_arc_receiver_forward_class
2454  : diag::warn_receiver_forward_class),
2455  TypeRange)) {
2456  // A forward class used in messaging is treated as a 'Class'
2457  Method = LookupFactoryMethodInGlobalPool(Sel,
2458  SourceRange(LBracLoc, RBracLoc));
2459  if (Method && !getLangOpts().ObjCAutoRefCount)
2460  Diag(Method->getLocation(), diag::note_method_sent_forward_class)
2461  << Method->getDeclName();
2462  }
2463  if (!Method)
2464  Method = Class->lookupClassMethod(Sel);
2465 
2466  // If we have an implementation in scope, check "private" methods.
2467  if (!Method)
2468  Method = Class->lookupPrivateClassMethod(Sel);
2469 
2470  if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs))
2471  return ExprError();
2472  }
2473 
2474  // Check the argument types and determine the result type.
2475  QualType ReturnType;
2476  ExprValueKind VK = VK_RValue;
2477 
2478  unsigned NumArgs = ArgsIn.size();
2479  Expr **Args = ArgsIn.data();
2480  if (CheckMessageArgumentTypes(ReceiverType, MultiExprArg(Args, NumArgs),
2481  Sel, SelectorLocs,
2482  Method, true,
2483  SuperLoc.isValid(), LBracLoc, RBracLoc,
2484  SourceRange(),
2485  ReturnType, VK))
2486  return ExprError();
2487 
2488  if (Method && !Method->getReturnType()->isVoidType() &&
2489  RequireCompleteType(LBracLoc, Method->getReturnType(),
2490  diag::err_illegal_message_expr_incomplete_type))
2491  return ExprError();
2492 
2493  // Warn about explicit call of +initialize on its own class. But not on 'super'.
2494  if (Method && Method->getMethodFamily() == OMF_initialize) {
2495  if (!SuperLoc.isValid()) {
2496  const ObjCInterfaceDecl *ID =
2497  dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext());
2498  if (ID == Class) {
2499  Diag(Loc, diag::warn_direct_initialize_call);
2500  Diag(Method->getLocation(), diag::note_method_declared_at)
2501  << Method->getDeclName();
2502  }
2503  }
2504  else if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2505  // [super initialize] is allowed only within an +initialize implementation
2506  if (CurMeth->getMethodFamily() != OMF_initialize) {
2507  Diag(Loc, diag::warn_direct_super_initialize_call);
2508  Diag(Method->getLocation(), diag::note_method_declared_at)
2509  << Method->getDeclName();
2510  Diag(CurMeth->getLocation(), diag::note_method_declared_at)
2511  << CurMeth->getDeclName();
2512  }
2513  }
2514  }
2515 
2516  DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
2517 
2518  // Construct the appropriate ObjCMessageExpr.
2519  ObjCMessageExpr *Result;
2520  if (SuperLoc.isValid())
2521  Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2522  SuperLoc, /*IsInstanceSuper=*/false,
2523  ReceiverType, Sel, SelectorLocs,
2524  Method, makeArrayRef(Args, NumArgs),
2525  RBracLoc, isImplicit);
2526  else {
2527  Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2528  ReceiverTypeInfo, Sel, SelectorLocs,
2529  Method, makeArrayRef(Args, NumArgs),
2530  RBracLoc, isImplicit);
2531  if (!isImplicit)
2532  checkCocoaAPI(*this, Result);
2533  }
2534  if (Method)
2535  checkFoundationAPI(*this, SelLoc, Method, makeArrayRef(Args, NumArgs),
2536  ReceiverType, /*IsClassObjectCall=*/true);
2537  return MaybeBindToTemporary(Result);
2538 }
2539 
2540 // ActOnClassMessage - used for both unary and keyword messages.
2541 // ArgExprs is optional - if it is present, the number of expressions
2542 // is obtained from Sel.getNumArgs().
2544  ParsedType Receiver,
2545  Selector Sel,
2546  SourceLocation LBracLoc,
2547  ArrayRef<SourceLocation> SelectorLocs,
2548  SourceLocation RBracLoc,
2549  MultiExprArg Args) {
2550  TypeSourceInfo *ReceiverTypeInfo;
2551  QualType ReceiverType = GetTypeFromParser(Receiver, &ReceiverTypeInfo);
2552  if (ReceiverType.isNull())
2553  return ExprError();
2554 
2555  if (!ReceiverTypeInfo)
2556  ReceiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType, LBracLoc);
2557 
2558  return BuildClassMessage(ReceiverTypeInfo, ReceiverType,
2559  /*SuperLoc=*/SourceLocation(), Sel,
2560  /*Method=*/nullptr, LBracLoc, SelectorLocs, RBracLoc,
2561  Args);
2562 }
2563 
2565  QualType ReceiverType,
2566  SourceLocation Loc,
2567  Selector Sel,
2568  ObjCMethodDecl *Method,
2569  MultiExprArg Args) {
2570  return BuildInstanceMessage(Receiver, ReceiverType,
2571  /*SuperLoc=*/!Receiver ? Loc : SourceLocation(),
2572  Sel, Method, Loc, Loc, Loc, Args,
2573  /*isImplicit=*/true);
2574 }
2575 
2577  if (!S.NSAPIObj)
2578  return false;
2579  const auto *Protocol = dyn_cast<ObjCProtocolDecl>(M->getDeclContext());
2580  if (!Protocol)
2581  return false;
2582  const IdentifierInfo *II = S.NSAPIObj->getNSClassId(NSAPI::ClassId_NSObject);
2583  if (const auto *RootClass = dyn_cast_or_null<ObjCInterfaceDecl>(
2584  S.LookupSingleName(S.TUScope, II, Protocol->getBeginLoc(),
2586  for (const ObjCProtocolDecl *P : RootClass->all_referenced_protocols()) {
2587  if (P->getCanonicalDecl() == Protocol->getCanonicalDecl())
2588  return true;
2589  }
2590  }
2591  return false;
2592 }
2593 
2594 /// Build an Objective-C instance message expression.
2595 ///
2596 /// This routine takes care of both normal instance messages and
2597 /// instance messages to the superclass instance.
2598 ///
2599 /// \param Receiver The expression that computes the object that will
2600 /// receive this message. This may be empty, in which case we are
2601 /// sending to the superclass instance and \p SuperLoc must be a valid
2602 /// source location.
2603 ///
2604 /// \param ReceiverType The (static) type of the object receiving the
2605 /// message. When a \p Receiver expression is provided, this is the
2606 /// same type as that expression. For a superclass instance send, this
2607 /// is a pointer to the type of the superclass.
2608 ///
2609 /// \param SuperLoc The location of the "super" keyword in a
2610 /// superclass instance message.
2611 ///
2612 /// \param Sel The selector to which the message is being sent.
2613 ///
2614 /// \param Method The method that this instance message is invoking, if
2615 /// already known.
2616 ///
2617 /// \param LBracLoc The location of the opening square bracket ']'.
2618 ///
2619 /// \param RBracLoc The location of the closing square bracket ']'.
2620 ///
2621 /// \param ArgsIn The message arguments.
2623  QualType ReceiverType,
2624  SourceLocation SuperLoc,
2625  Selector Sel,
2626  ObjCMethodDecl *Method,
2627  SourceLocation LBracLoc,
2628  ArrayRef<SourceLocation> SelectorLocs,
2629  SourceLocation RBracLoc,
2630  MultiExprArg ArgsIn,
2631  bool isImplicit) {
2632  assert((Receiver || SuperLoc.isValid()) && "If the Receiver is null, the "
2633  "SuperLoc must be valid so we can "
2634  "use it instead.");
2635 
2636  // The location of the receiver.
2637  SourceLocation Loc = SuperLoc.isValid() ? SuperLoc : Receiver->getBeginLoc();
2638  SourceRange RecRange =
2639  SuperLoc.isValid()? SuperLoc : Receiver->getSourceRange();
2640  ArrayRef<SourceLocation> SelectorSlotLocs;
2641  if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2642  SelectorSlotLocs = SelectorLocs;
2643  else
2644  SelectorSlotLocs = Loc;
2645  SourceLocation SelLoc = SelectorSlotLocs.front();
2646 
2647  if (LBracLoc.isInvalid()) {
2648  Diag(Loc, diag::err_missing_open_square_message_send)
2649  << FixItHint::CreateInsertion(Loc, "[");
2650  LBracLoc = Loc;
2651  }
2652 
2653  // If we have a receiver expression, perform appropriate promotions
2654  // and determine receiver type.
2655  if (Receiver) {
2656  if (Receiver->hasPlaceholderType()) {
2657  ExprResult Result;
2658  if (Receiver->getType() == Context.UnknownAnyTy)
2659  Result = forceUnknownAnyToType(Receiver, Context.getObjCIdType());
2660  else
2661  Result = CheckPlaceholderExpr(Receiver);
2662  if (Result.isInvalid()) return ExprError();
2663  Receiver = Result.get();
2664  }
2665 
2666  if (Receiver->isTypeDependent()) {
2667  // If the receiver is type-dependent, we can't type-check anything
2668  // at this point. Build a dependent expression.
2669  unsigned NumArgs = ArgsIn.size();
2670  Expr **Args = ArgsIn.data();
2671  assert(SuperLoc.isInvalid() && "Message to super with dependent type");
2672  return ObjCMessageExpr::Create(
2673  Context, Context.DependentTy, VK_RValue, LBracLoc, Receiver, Sel,
2674  SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs),
2675  RBracLoc, isImplicit);
2676  }
2677 
2678  // If necessary, apply function/array conversion to the receiver.
2679  // C99 6.7.5.3p[7,8].
2680  ExprResult Result = DefaultFunctionArrayLvalueConversion(Receiver);
2681  if (Result.isInvalid())
2682  return ExprError();
2683  Receiver = Result.get();
2684  ReceiverType = Receiver->getType();
2685 
2686  // If the receiver is an ObjC pointer, a block pointer, or an
2687  // __attribute__((NSObject)) pointer, we don't need to do any
2688  // special conversion in order to look up a receiver.
2689  if (ReceiverType->isObjCRetainableType()) {
2690  // do nothing
2691  } else if (!getLangOpts().ObjCAutoRefCount &&
2692  !Context.getObjCIdType().isNull() &&
2693  (ReceiverType->isPointerType() ||
2694  ReceiverType->isIntegerType())) {
2695  // Implicitly convert integers and pointers to 'id' but emit a warning.
2696  // But not in ARC.
2697  Diag(Loc, diag::warn_bad_receiver_type)
2698  << ReceiverType
2699  << Receiver->getSourceRange();
2700  if (ReceiverType->isPointerType()) {
2701  Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2702  CK_CPointerToObjCPointerCast).get();
2703  } else {
2704  // TODO: specialized warning on null receivers?
2705  bool IsNull = Receiver->isNullPointerConstant(Context,
2707  CastKind Kind = IsNull ? CK_NullToPointer : CK_IntegralToPointer;
2708  Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2709  Kind).get();
2710  }
2711  ReceiverType = Receiver->getType();
2712  } else if (getLangOpts().CPlusPlus) {
2713  // The receiver must be a complete type.
2714  if (RequireCompleteType(Loc, Receiver->getType(),
2715  diag::err_incomplete_receiver_type))
2716  return ExprError();
2717 
2718  ExprResult result = PerformContextuallyConvertToObjCPointer(Receiver);
2719  if (result.isUsable()) {
2720  Receiver = result.get();
2721  ReceiverType = Receiver->getType();
2722  }
2723  }
2724  }
2725 
2726  if (ReceiverType->isObjCIdType() && !isImplicit)
2727  Diag(Receiver->getExprLoc(), diag::warn_messaging_unqualified_id);
2728 
2729  // There's a somewhat weird interaction here where we assume that we
2730  // won't actually have a method unless we also don't need to do some
2731  // of the more detailed type-checking on the receiver.
2732 
2733  if (!Method) {
2734  // Handle messages to id and __kindof types (where we use the
2735  // global method pool).
2736  const ObjCObjectType *typeBound = nullptr;
2737  bool receiverIsIdLike = ReceiverType->isObjCIdOrObjectKindOfType(Context,
2738  typeBound);
2739  if (receiverIsIdLike || ReceiverType->isBlockPointerType() ||
2740  (Receiver && Context.isObjCNSObjectType(Receiver->getType()))) {
2742  // If we have a type bound, further filter the methods.
2743  CollectMultipleMethodsInGlobalPool(Sel, Methods, true/*InstanceFirst*/,
2744  true/*CheckTheOther*/, typeBound);
2745  if (!Methods.empty()) {
2746  // We choose the first method as the initial candidate, then try to
2747  // select a better one.
2748  Method = Methods[0];
2749 
2750  if (ObjCMethodDecl *BestMethod =
2751  SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(), Methods))
2752  Method = BestMethod;
2753 
2754  if (!AreMultipleMethodsInGlobalPool(Sel, Method,
2755  SourceRange(LBracLoc, RBracLoc),
2756  receiverIsIdLike, Methods))
2757  DiagnoseUseOfDecl(Method, SelectorSlotLocs);
2758  }
2759  } else if (ReceiverType->isObjCClassOrClassKindOfType() ||
2760  ReceiverType->isObjCQualifiedClassType()) {
2761  // Handle messages to Class.
2762  // We allow sending a message to a qualified Class ("Class<foo>"), which
2763  // is ok as long as one of the protocols implements the selector (if not,
2764  // warn).
2765  if (!ReceiverType->isObjCClassOrClassKindOfType()) {
2766  const ObjCObjectPointerType *QClassTy
2767  = ReceiverType->getAsObjCQualifiedClassType();
2768  // Search protocols for class methods.
2769  Method = LookupMethodInQualifiedType(Sel, QClassTy, false);
2770  if (!Method) {
2771  Method = LookupMethodInQualifiedType(Sel, QClassTy, true);
2772  // warn if instance method found for a Class message.
2773  if (Method && !isMethodDeclaredInRootProtocol(*this, Method)) {
2774  Diag(SelLoc, diag::warn_instance_method_on_class_found)
2775  << Method->getSelector() << Sel;
2776  Diag(Method->getLocation(), diag::note_method_declared_at)
2777  << Method->getDeclName();
2778  }
2779  }
2780  } else {
2781  if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2782  if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) {
2783  // First check the public methods in the class interface.
2784  Method = ClassDecl->lookupClassMethod(Sel);
2785 
2786  if (!Method)
2787  Method = ClassDecl->lookupPrivateClassMethod(Sel);
2788  }
2789  if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs))
2790  return ExprError();
2791  }
2792  if (!Method) {
2793  // If not messaging 'self', look for any factory method named 'Sel'.
2794  if (!Receiver || !isSelfExpr(Receiver)) {
2795  // If no class (factory) method was found, check if an _instance_
2796  // method of the same name exists in the root class only.
2798  CollectMultipleMethodsInGlobalPool(Sel, Methods,
2799  false/*InstanceFirst*/,
2800  true/*CheckTheOther*/);
2801  if (!Methods.empty()) {
2802  // We choose the first method as the initial candidate, then try
2803  // to select a better one.
2804  Method = Methods[0];
2805 
2806  // If we find an instance method, emit warning.
2807  if (Method->isInstanceMethod()) {
2808  if (const ObjCInterfaceDecl *ID =
2809  dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext())) {
2810  if (ID->getSuperClass())
2811  Diag(SelLoc, diag::warn_root_inst_method_not_found)
2812  << Sel << SourceRange(LBracLoc, RBracLoc);
2813  }
2814  }
2815 
2816  if (ObjCMethodDecl *BestMethod =
2817  SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(),
2818  Methods))
2819  Method = BestMethod;
2820  }
2821  }
2822  }
2823  }
2824  } else {
2825  ObjCInterfaceDecl *ClassDecl = nullptr;
2826 
2827  // We allow sending a message to a qualified ID ("id<foo>"), which is ok as
2828  // long as one of the protocols implements the selector (if not, warn).
2829  // And as long as message is not deprecated/unavailable (warn if it is).
2830  if (const ObjCObjectPointerType *QIdTy
2831  = ReceiverType->getAsObjCQualifiedIdType()) {
2832  // Search protocols for instance methods.
2833  Method = LookupMethodInQualifiedType(Sel, QIdTy, true);
2834  if (!Method)
2835  Method = LookupMethodInQualifiedType(Sel, QIdTy, false);
2836  if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs))
2837  return ExprError();
2838  } else if (const ObjCObjectPointerType *OCIType
2839  = ReceiverType->getAsObjCInterfacePointerType()) {
2840  // We allow sending a message to a pointer to an interface (an object).
2841  ClassDecl = OCIType->getInterfaceDecl();
2842 
2843  // Try to complete the type. Under ARC, this is a hard error from which
2844  // we don't try to recover.
2845  // FIXME: In the non-ARC case, this will still be a hard error if the
2846  // definition is found in a module that's not visible.
2847  const ObjCInterfaceDecl *forwardClass = nullptr;
2848  if (RequireCompleteType(Loc, OCIType->getPointeeType(),
2849  getLangOpts().ObjCAutoRefCount
2850  ? diag::err_arc_receiver_forward_instance
2851  : diag::warn_receiver_forward_instance,
2852  Receiver? Receiver->getSourceRange()
2853  : SourceRange(SuperLoc))) {
2854  if (getLangOpts().ObjCAutoRefCount)
2855  return ExprError();
2856 
2857  forwardClass = OCIType->getInterfaceDecl();
2858  Diag(Receiver ? Receiver->getBeginLoc() : SuperLoc,
2859  diag::note_receiver_is_id);
2860  Method = nullptr;
2861  } else {
2862  Method = ClassDecl->lookupInstanceMethod(Sel);
2863  }
2864 
2865  if (!Method)
2866  // Search protocol qualifiers.
2867  Method = LookupMethodInQualifiedType(Sel, OCIType, true);
2868 
2869  if (!Method) {
2870  // If we have implementations in scope, check "private" methods.
2871  Method = ClassDecl->lookupPrivateMethod(Sel);
2872 
2873  if (!Method && getLangOpts().ObjCAutoRefCount) {
2874  Diag(SelLoc, diag::err_arc_may_not_respond)
2875  << OCIType->getPointeeType() << Sel << RecRange
2876  << SourceRange(SelectorLocs.front(), SelectorLocs.back());
2877  return ExprError();
2878  }
2879 
2880  if (!Method && (!Receiver || !isSelfExpr(Receiver))) {
2881  // If we still haven't found a method, look in the global pool. This
2882  // behavior isn't very desirable, however we need it for GCC
2883  // compatibility. FIXME: should we deviate??
2884  if (OCIType->qual_empty()) {
2886  CollectMultipleMethodsInGlobalPool(Sel, Methods,
2887  true/*InstanceFirst*/,
2888  false/*CheckTheOther*/);
2889  if (!Methods.empty()) {
2890  // We choose the first method as the initial candidate, then try
2891  // to select a better one.
2892  Method = Methods[0];
2893 
2894  if (ObjCMethodDecl *BestMethod =
2895  SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(),
2896  Methods))
2897  Method = BestMethod;
2898 
2899  AreMultipleMethodsInGlobalPool(Sel, Method,
2900  SourceRange(LBracLoc, RBracLoc),
2901  true/*receiverIdOrClass*/,
2902  Methods);
2903  }
2904  if (Method && !forwardClass)
2905  Diag(SelLoc, diag::warn_maynot_respond)
2906  << OCIType->getInterfaceDecl()->getIdentifier()
2907  << Sel << RecRange;
2908  }
2909  }
2910  }
2911  if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs, forwardClass))
2912  return ExprError();
2913  } else {
2914  // Reject other random receiver types (e.g. structs).
2915  Diag(Loc, diag::err_bad_receiver_type)
2916  << ReceiverType << Receiver->getSourceRange();
2917  return ExprError();
2918  }
2919  }
2920  }
2921 
2922  FunctionScopeInfo *DIFunctionScopeInfo =
2923  (Method && Method->getMethodFamily() == OMF_init)
2924  ? getEnclosingFunction() : nullptr;
2925 
2926  if (DIFunctionScopeInfo &&
2927  DIFunctionScopeInfo->ObjCIsDesignatedInit &&
2928  (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2929  bool isDesignatedInitChain = false;
2930  if (SuperLoc.isValid()) {
2931  if (const ObjCObjectPointerType *
2932  OCIType = ReceiverType->getAsObjCInterfacePointerType()) {
2933  if (const ObjCInterfaceDecl *ID = OCIType->getInterfaceDecl()) {
2934  // Either we know this is a designated initializer or we
2935  // conservatively assume it because we don't know for sure.
2936  if (!ID->declaresOrInheritsDesignatedInitializers() ||
2937  ID->isDesignatedInitializer(Sel)) {
2938  isDesignatedInitChain = true;
2939  DIFunctionScopeInfo->ObjCWarnForNoDesignatedInitChain = false;
2940  }
2941  }
2942  }
2943  }
2944  if (!isDesignatedInitChain) {
2945  const ObjCMethodDecl *InitMethod = nullptr;
2946  bool isDesignated =
2947  getCurMethodDecl()->isDesignatedInitializerForTheInterface(&InitMethod);
2948  assert(isDesignated && InitMethod);
2949  (void)isDesignated;
2950  Diag(SelLoc, SuperLoc.isValid() ?
2951  diag::warn_objc_designated_init_non_designated_init_call :
2952  diag::warn_objc_designated_init_non_super_designated_init_call);
2953  Diag(InitMethod->getLocation(),
2954  diag::note_objc_designated_init_marked_here);
2955  }
2956  }
2957 
2958  if (DIFunctionScopeInfo &&
2959  DIFunctionScopeInfo->ObjCIsSecondaryInit &&
2960  (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2961  if (SuperLoc.isValid()) {
2962  Diag(SelLoc, diag::warn_objc_secondary_init_super_init_call);
2963  } else {
2964  DIFunctionScopeInfo->ObjCWarnForNoInitDelegation = false;
2965  }
2966  }
2967 
2968  // Check the message arguments.
2969  unsigned NumArgs = ArgsIn.size();
2970  Expr **Args = ArgsIn.data();
2971  QualType ReturnType;
2972  ExprValueKind VK = VK_RValue;
2973  bool ClassMessage = (ReceiverType->isObjCClassType() ||
2974  ReceiverType->isObjCQualifiedClassType());
2975  if (CheckMessageArgumentTypes(ReceiverType, MultiExprArg(Args, NumArgs),
2976  Sel, SelectorLocs, Method,
2977  ClassMessage, SuperLoc.isValid(),
2978  LBracLoc, RBracLoc, RecRange, ReturnType, VK))
2979  return ExprError();
2980 
2981  if (Method && !Method->getReturnType()->isVoidType() &&
2982  RequireCompleteType(LBracLoc, Method->getReturnType(),
2983  diag::err_illegal_message_expr_incomplete_type))
2984  return ExprError();
2985 
2986  // In ARC, forbid the user from sending messages to
2987  // retain/release/autorelease/dealloc/retainCount explicitly.
2988  if (getLangOpts().ObjCAutoRefCount) {
2989  ObjCMethodFamily family =
2990  (Method ? Method->getMethodFamily() : Sel.getMethodFamily());
2991  switch (family) {
2992  case OMF_init:
2993  if (Method)
2994  checkInitMethod(Method, ReceiverType);
2995  break;
2996 
2997  case OMF_None:
2998  case OMF_alloc:
2999  case OMF_copy:
3000  case OMF_finalize:
3001  case OMF_mutableCopy:
3002  case OMF_new:
3003  case OMF_self:
3004  case OMF_initialize:
3005  break;
3006 
3007  case OMF_dealloc:
3008  case OMF_retain:
3009  case OMF_release:
3010  case OMF_autorelease:
3011  case OMF_retainCount:
3012  Diag(SelLoc, diag::err_arc_illegal_explicit_message)
3013  << Sel << RecRange;
3014  break;
3015 
3016  case OMF_performSelector:
3017  if (Method && NumArgs >= 1) {
3018  if (const auto *SelExp =
3019  dyn_cast<ObjCSelectorExpr>(Args[0]->IgnoreParens())) {
3020  Selector ArgSel = SelExp->getSelector();
3021  ObjCMethodDecl *SelMethod =
3022  LookupInstanceMethodInGlobalPool(ArgSel,
3023  SelExp->getSourceRange());
3024  if (!SelMethod)
3025  SelMethod =
3026  LookupFactoryMethodInGlobalPool(ArgSel,
3027  SelExp->getSourceRange());
3028  if (SelMethod) {
3029  ObjCMethodFamily SelFamily = SelMethod->getMethodFamily();
3030  switch (SelFamily) {
3031  case OMF_alloc:
3032  case OMF_copy:
3033  case OMF_mutableCopy:
3034  case OMF_new:
3035  case OMF_init:
3036  // Issue error, unless ns_returns_not_retained.
3037  if (!SelMethod->hasAttr<NSReturnsNotRetainedAttr>()) {
3038  // selector names a +1 method
3039  Diag(SelLoc,
3040  diag::err_arc_perform_selector_retains);
3041  Diag(SelMethod->getLocation(), diag::note_method_declared_at)
3042  << SelMethod->getDeclName();
3043  }
3044  break;
3045  default:
3046  // +0 call. OK. unless ns_returns_retained.
3047  if (SelMethod->hasAttr<NSReturnsRetainedAttr>()) {
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  }
3056  }
3057  } else {
3058  // error (may leak).
3059  Diag(SelLoc, diag::warn_arc_perform_selector_leaks);
3060  Diag(Args[0]->getExprLoc(), diag::note_used_here);
3061  }
3062  }
3063  break;
3064  }
3065  }
3066 
3067  DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
3068 
3069  // Construct the appropriate ObjCMessageExpr instance.
3070  ObjCMessageExpr *Result;
3071  if (SuperLoc.isValid())
3072  Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
3073  SuperLoc, /*IsInstanceSuper=*/true,
3074  ReceiverType, Sel, SelectorLocs, Method,
3075  makeArrayRef(Args, NumArgs), RBracLoc,
3076  isImplicit);
3077  else {
3078  Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
3079  Receiver, Sel, SelectorLocs, Method,
3080  makeArrayRef(Args, NumArgs), RBracLoc,
3081  isImplicit);
3082  if (!isImplicit)
3083  checkCocoaAPI(*this, Result);
3084  }
3085  if (Method) {
3086  bool IsClassObjectCall = ClassMessage;
3087  // 'self' message receivers in class methods should be treated as message
3088  // sends to the class object in order for the semantic checks to be
3089  // performed correctly. Messages to 'super' already count as class messages,
3090  // so they don't need to be handled here.
3091  if (Receiver && isSelfExpr(Receiver)) {
3092  if (const auto *OPT = ReceiverType->getAs<ObjCObjectPointerType>()) {
3093  if (OPT->getObjectType()->isObjCClass()) {
3094  if (const auto *CurMeth = getCurMethodDecl()) {
3095  IsClassObjectCall = true;
3096  ReceiverType =
3097  Context.getObjCInterfaceType(CurMeth->getClassInterface());
3098  }
3099  }
3100  }
3101  }
3102  checkFoundationAPI(*this, SelLoc, Method, makeArrayRef(Args, NumArgs),
3103  ReceiverType, IsClassObjectCall);
3104  }
3105 
3106  if (getLangOpts().ObjCAutoRefCount) {
3107  // In ARC, annotate delegate init calls.
3108  if (Result->getMethodFamily() == OMF_init &&
3109  (SuperLoc.isValid() || isSelfExpr(Receiver))) {
3110  // Only consider init calls *directly* in init implementations,
3111  // not within blocks.
3112  ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(CurContext);
3113  if (method && method->getMethodFamily() == OMF_init) {
3114  // The implicit assignment to self means we also don't want to
3115  // consume the result.
3116  Result->setDelegateInitCall(true);
3117  return Result;
3118  }
3119  }
3120 
3121  // In ARC, check for message sends which are likely to introduce
3122  // retain cycles.
3123  checkRetainCycles(Result);
3124  }
3125 
3126  if (getLangOpts().ObjCWeak) {
3127  if (!isImplicit && Method) {
3128  if (const ObjCPropertyDecl *Prop = Method->findPropertyDecl()) {
3129  bool IsWeak =
3130  Prop->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak;
3131  if (!IsWeak && Sel.isUnarySelector())
3132  IsWeak = ReturnType.getObjCLifetime() & Qualifiers::OCL_Weak;
3133  if (IsWeak &&
3134  !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, LBracLoc))
3135  getCurFunction()->recordUseOfWeak(Result, Prop);
3136  }
3137  }
3138  }
3139 
3140  CheckObjCCircularContainer(Result);
3141 
3142  return MaybeBindToTemporary(Result);
3143 }
3144 
3146  if (ObjCSelectorExpr *OSE =
3147  dyn_cast<ObjCSelectorExpr>(Arg->IgnoreParenCasts())) {
3148  Selector Sel = OSE->getSelector();
3149  SourceLocation Loc = OSE->getAtLoc();
3150  auto Pos = S.ReferencedSelectors.find(Sel);
3151  if (Pos != S.ReferencedSelectors.end() && Pos->second == Loc)
3152  S.ReferencedSelectors.erase(Pos);
3153  }
3154 }
3155 
3156 // ActOnInstanceMessage - used for both unary and keyword messages.
3157 // ArgExprs is optional - if it is present, the number of expressions
3158 // is obtained from Sel.getNumArgs().
3160  Expr *Receiver,
3161  Selector Sel,
3162  SourceLocation LBracLoc,
3163  ArrayRef<SourceLocation> SelectorLocs,
3164  SourceLocation RBracLoc,
3165  MultiExprArg Args) {
3166  if (!Receiver)
3167  return ExprError();
3168 
3169  // A ParenListExpr can show up while doing error recovery with invalid code.
3170  if (isa<ParenListExpr>(Receiver)) {
3171  ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Receiver);
3172  if (Result.isInvalid()) return ExprError();
3173  Receiver = Result.get();
3174  }
3175 
3176  if (RespondsToSelectorSel.isNull()) {
3177  IdentifierInfo *SelectorId = &Context.Idents.get("respondsToSelector");
3178  RespondsToSelectorSel = Context.Selectors.getUnarySelector(SelectorId);
3179  }
3180  if (Sel == RespondsToSelectorSel)
3181  RemoveSelectorFromWarningCache(*this, Args[0]);
3182 
3183  return BuildInstanceMessage(Receiver, Receiver->getType(),
3184  /*SuperLoc=*/SourceLocation(), Sel,
3185  /*Method=*/nullptr, LBracLoc, SelectorLocs,
3186  RBracLoc, Args);
3187 }
3188 
3190  /// int, void, struct A
3192 
3193  /// id, void (^)()
3195 
3196  /// id*, id***, void (^*)(),
3198 
3199  /// void* might be a normal C type, or it might a CF type.
3201 
3202  /// struct A*
3204 };
3205 
3207  return (ACTC == ACTC_retainable ||
3208  ACTC == ACTC_coreFoundation ||
3209  ACTC == ACTC_voidPtr);
3210 }
3211 
3213  return ACTC == ACTC_none ||
3214  ACTC == ACTC_voidPtr ||
3215  ACTC == ACTC_coreFoundation;
3216 }
3217 
3219  bool isIndirect = false;
3220 
3221  // Ignore an outermost reference type.
3222  if (const ReferenceType *ref = type->getAs<ReferenceType>()) {
3223  type = ref->getPointeeType();
3224  isIndirect = true;
3225  }
3226 
3227  // Drill through pointers and arrays recursively.
3228  while (true) {
3229  if (const PointerType *ptr = type->getAs<PointerType>()) {
3230  type = ptr->getPointeeType();
3231 
3232  // The first level of pointer may be the innermost pointer on a CF type.
3233  if (!isIndirect) {
3234  if (type->isVoidType()) return ACTC_voidPtr;
3235  if (type->isRecordType()) return ACTC_coreFoundation;
3236  }
3237  } else if (const ArrayType *array = type->getAsArrayTypeUnsafe()) {
3238  type = QualType(array->getElementType()->getBaseElementTypeUnsafe(), 0);
3239  } else {
3240  break;
3241  }
3242  isIndirect = true;
3243  }
3244 
3245  if (isIndirect) {
3246  if (type->isObjCARCBridgableType())
3247  return ACTC_indirectRetainable;
3248  return ACTC_none;
3249  }
3250 
3251  if (type->isObjCARCBridgableType())
3252  return ACTC_retainable;
3253 
3254  return ACTC_none;
3255 }
3256 
3257 namespace {
3258  /// A result from the cast checker.
3259  enum ACCResult {
3260  /// Cannot be casted.
3261  ACC_invalid,
3262 
3263  /// Can be safely retained or not retained.
3264  ACC_bottom,
3265 
3266  /// Can be casted at +0.
3267  ACC_plusZero,
3268 
3269  /// Can be casted at +1.
3270  ACC_plusOne
3271  };
3272  ACCResult merge(ACCResult left, ACCResult right) {
3273  if (left == right) return left;
3274  if (left == ACC_bottom) return right;
3275  if (right == ACC_bottom) return left;
3276  return ACC_invalid;
3277  }
3278 
3279  /// A checker which white-lists certain expressions whose conversion
3280  /// to or from retainable type would otherwise be forbidden in ARC.
3281  class ARCCastChecker : public StmtVisitor<ARCCastChecker, ACCResult> {
3283 
3284  ASTContext &Context;
3285  ARCConversionTypeClass SourceClass;
3286  ARCConversionTypeClass TargetClass;
3287  bool Diagnose;
3288 
3289  static bool isCFType(QualType type) {
3290  // Someday this can use ns_bridged. For now, it has to do this.
3291  return type->isCARCBridgableType();
3292  }
3293 
3294  public:
3295  ARCCastChecker(ASTContext &Context, ARCConversionTypeClass source,
3296  ARCConversionTypeClass target, bool diagnose)
3297  : Context(Context), SourceClass(source), TargetClass(target),
3298  Diagnose(diagnose) {}
3299 
3300  using super::Visit;
3301  ACCResult Visit(Expr *e) {
3302  return super::Visit(e->IgnoreParens());
3303  }
3304 
3305  ACCResult VisitStmt(Stmt *s) {
3306  return ACC_invalid;
3307  }
3308 
3309  /// Null pointer constants can be casted however you please.
3310  ACCResult VisitExpr(Expr *e) {
3312  return ACC_bottom;
3313  return ACC_invalid;
3314  }
3315 
3316  /// Objective-C string literals can be safely casted.
3317  ACCResult VisitObjCStringLiteral(ObjCStringLiteral *e) {
3318  // If we're casting to any retainable type, go ahead. Global
3319  // strings are immune to retains, so this is bottom.
3320  if (isAnyRetainable(TargetClass)) return ACC_bottom;
3321 
3322  return ACC_invalid;
3323  }
3324 
3325  /// Look through certain implicit and explicit casts.
3326  ACCResult VisitCastExpr(CastExpr *e) {
3327  switch (e->getCastKind()) {
3328  case CK_NullToPointer:
3329  return ACC_bottom;
3330 
3331  case CK_NoOp:
3332  case CK_LValueToRValue:
3333  case CK_BitCast:
3334  case CK_CPointerToObjCPointerCast:
3335  case CK_BlockPointerToObjCPointerCast:
3336  case CK_AnyPointerToBlockPointerCast:
3337  return Visit(e->getSubExpr());
3338 
3339  default:
3340  return ACC_invalid;
3341  }
3342  }
3343 
3344  /// Look through unary extension.
3345  ACCResult VisitUnaryExtension(UnaryOperator *e) {
3346  return Visit(e->getSubExpr());
3347  }
3348 
3349  /// Ignore the LHS of a comma operator.
3350  ACCResult VisitBinComma(BinaryOperator *e) {
3351  return Visit(e->getRHS());
3352  }
3353 
3354  /// Conditional operators are okay if both sides are okay.
3355  ACCResult VisitConditionalOperator(ConditionalOperator *e) {
3356  ACCResult left = Visit(e->getTrueExpr());
3357  if (left == ACC_invalid) return ACC_invalid;
3358  return merge(left, Visit(e->getFalseExpr()));
3359  }
3360 
3361  /// Look through pseudo-objects.
3362  ACCResult VisitPseudoObjectExpr(PseudoObjectExpr *e) {
3363  // If we're getting here, we should always have a result.
3364  return Visit(e->getResultExpr());
3365  }
3366 
3367  /// Statement expressions are okay if their result expression is okay.
3368  ACCResult VisitStmtExpr(StmtExpr *e) {
3369  return Visit(e->getSubStmt()->body_back());
3370  }
3371 
3372  /// Some declaration references are okay.
3373  ACCResult VisitDeclRefExpr(DeclRefExpr *e) {
3374  VarDecl *var = dyn_cast<VarDecl>(e->getDecl());
3375  // References to global constants are okay.
3376  if (isAnyRetainable(TargetClass) &&
3377  isAnyRetainable(SourceClass) &&
3378  var &&
3379  !var->hasDefinition(Context) &&
3380  var->getType().isConstQualified()) {
3381 
3382  // In system headers, they can also be assumed to be immune to retains.
3383  // These are things like 'kCFStringTransformToLatin'.
3384  if (Context.getSourceManager().isInSystemHeader(var->getLocation()))
3385  return ACC_bottom;
3386 
3387  return ACC_plusZero;
3388  }
3389 
3390  // Nothing else.
3391  return ACC_invalid;
3392  }
3393 
3394  /// Some calls are okay.
3395  ACCResult VisitCallExpr(CallExpr *e) {
3396  if (FunctionDecl *fn = e->getDirectCallee())
3397  if (ACCResult result = checkCallToFunction(fn))
3398  return result;
3399 
3400  return super::VisitCallExpr(e);
3401  }
3402 
3403  ACCResult checkCallToFunction(FunctionDecl *fn) {
3404  // Require a CF*Ref return type.
3405  if (!isCFType(fn->getReturnType()))
3406  return ACC_invalid;
3407 
3408  if (!isAnyRetainable(TargetClass))
3409  return ACC_invalid;
3410 
3411  // Honor an explicit 'not retained' attribute.
3412  if (fn->hasAttr<CFReturnsNotRetainedAttr>())
3413  return ACC_plusZero;
3414 
3415  // Honor an explicit 'retained' attribute, except that for
3416  // now we're not going to permit implicit handling of +1 results,
3417  // because it's a bit frightening.
3418  if (fn->hasAttr<CFReturnsRetainedAttr>())
3419  return Diagnose ? ACC_plusOne
3420  : ACC_invalid; // ACC_plusOne if we start accepting this
3421 
3422  // Recognize this specific builtin function, which is used by CFSTR.
3423  unsigned builtinID = fn->getBuiltinID();
3424  if (builtinID == Builtin::BI__builtin___CFStringMakeConstantString)
3425  return ACC_bottom;
3426 
3427  // Otherwise, don't do anything implicit with an unaudited function.
3428  if (!fn->hasAttr<CFAuditedTransferAttr>())
3429  return ACC_invalid;
3430 
3431  // Otherwise, it's +0 unless it follows the create convention.
3433  return Diagnose ? ACC_plusOne
3434  : ACC_invalid; // ACC_plusOne if we start accepting this
3435 
3436  return ACC_plusZero;
3437  }
3438 
3439  ACCResult VisitObjCMessageExpr(ObjCMessageExpr *e) {
3440  return checkCallToMethod(e->getMethodDecl());
3441  }
3442 
3443  ACCResult VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *e) {
3444  ObjCMethodDecl *method;
3445  if (e->isExplicitProperty())
3446  method = e->getExplicitProperty()->getGetterMethodDecl();
3447  else
3448  method = e->getImplicitPropertyGetter();
3449  return checkCallToMethod(method);
3450  }
3451 
3452  ACCResult checkCallToMethod(ObjCMethodDecl *method) {
3453  if (!method) return ACC_invalid;
3454 
3455  // Check for message sends to functions returning CF types. We
3456  // just obey the Cocoa conventions with these, even though the
3457  // return type is CF.
3458  if (!isAnyRetainable(TargetClass) || !isCFType(method->getReturnType()))
3459  return ACC_invalid;
3460 
3461  // If the method is explicitly marked not-retained, it's +0.
3462  if (method->hasAttr<CFReturnsNotRetainedAttr>())
3463  return ACC_plusZero;
3464 
3465  // If the method is explicitly marked as returning retained, or its
3466  // selector follows a +1 Cocoa convention, treat it as +1.
3467  if (method->hasAttr<CFReturnsRetainedAttr>())
3468  return ACC_plusOne;
3469 
3470  switch (method->getSelector().getMethodFamily()) {
3471  case OMF_alloc:
3472  case OMF_copy:
3473  case OMF_mutableCopy:
3474  case OMF_new:
3475  return ACC_plusOne;
3476 
3477  default:
3478  // Otherwise, treat it as +0.
3479  return ACC_plusZero;
3480  }
3481  }
3482  };
3483 } // end anonymous namespace
3484 
3485 bool Sema::isKnownName(StringRef name) {
3486  if (name.empty())
3487  return false;
3488  LookupResult R(*this, &Context.Idents.get(name), SourceLocation(),
3490  return LookupName(R, TUScope, false);
3491 }
3492 
3494  DiagnosticBuilder &DiagB,
3496  SourceLocation afterLParen,
3497  QualType castType,
3498  Expr *castExpr,
3499  Expr *realCast,
3500  const char *bridgeKeyword,
3501  const char *CFBridgeName) {
3502  // We handle C-style and implicit casts here.
3503  switch (CCK) {
3506  case Sema::CCK_CStyleCast:
3507  case Sema::CCK_OtherCast:
3508  break;
3510  return;
3511  }
3512 
3513  if (CFBridgeName) {
3514  if (CCK == Sema::CCK_OtherCast) {
3515  if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3516  SourceRange range(NCE->getOperatorLoc(),
3517  NCE->getAngleBrackets().getEnd());
3518  SmallString<32> BridgeCall;
3519 
3521  char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3522  if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3523  BridgeCall += ' ';
3524 
3525  BridgeCall += CFBridgeName;
3526  DiagB.AddFixItHint(FixItHint::CreateReplacement(range, BridgeCall));
3527  }
3528  return;
3529  }
3530  Expr *castedE = castExpr;
3531  if (CStyleCastExpr *CCE = dyn_cast<CStyleCastExpr>(castedE))
3532  castedE = CCE->getSubExpr();
3533  castedE = castedE->IgnoreImpCasts();
3534  SourceRange range = castedE->getSourceRange();
3535 
3536  SmallString<32> BridgeCall;
3537 
3539  char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3540  if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3541  BridgeCall += ' ';
3542 
3543  BridgeCall += CFBridgeName;
3544 
3545  if (isa<ParenExpr>(castedE)) {
3547  BridgeCall));
3548  } else {
3549  BridgeCall += '(';
3551  BridgeCall));
3553  S.getLocForEndOfToken(range.getEnd()),
3554  ")"));
3555  }
3556  return;
3557  }
3558 
3559  if (CCK == Sema::CCK_CStyleCast) {
3560  DiagB.AddFixItHint(FixItHint::CreateInsertion(afterLParen, bridgeKeyword));
3561  } else if (CCK == Sema::CCK_OtherCast) {
3562  if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3563  std::string castCode = "(";
3564  castCode += bridgeKeyword;
3565  castCode += castType.getAsString();
3566  castCode += ")";
3567  SourceRange Range(NCE->getOperatorLoc(),
3568  NCE->getAngleBrackets().getEnd());
3569  DiagB.AddFixItHint(FixItHint::CreateReplacement(Range, castCode));
3570  }
3571  } else {
3572  std::string castCode = "(";
3573  castCode += bridgeKeyword;
3574  castCode += castType.getAsString();
3575  castCode += ")";
3576  Expr *castedE = castExpr->IgnoreImpCasts();
3577  SourceRange range = castedE->getSourceRange();
3578  if (isa<ParenExpr>(castedE)) {
3580  castCode));
3581  } else {
3582  castCode += "(";
3584  castCode));
3586  S.getLocForEndOfToken(range.getEnd()),
3587  ")"));
3588  }
3589  }
3590 }
3591 
3592 template <typename T>
3593 static inline T *getObjCBridgeAttr(const TypedefType *TD) {
3594  TypedefNameDecl *TDNDecl = TD->getDecl();
3595  QualType QT = TDNDecl->getUnderlyingType();
3596  if (QT->isPointerType()) {
3597  QT = QT->getPointeeType();
3598  if (const RecordType *RT = QT->getAs<RecordType>())
3599  if (RecordDecl *RD = RT->getDecl()->getMostRecentDecl())
3600  return RD->getAttr<T>();
3601  }
3602  return nullptr;
3603 }
3604 
3605 static ObjCBridgeRelatedAttr *ObjCBridgeRelatedAttrFromType(QualType T,
3606  TypedefNameDecl *&TDNDecl) {
3607  while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3608  TDNDecl = TD->getDecl();
3609  if (ObjCBridgeRelatedAttr *ObjCBAttr =
3610  getObjCBridgeAttr<ObjCBridgeRelatedAttr>(TD))
3611  return ObjCBAttr;
3612  T = TDNDecl->getUnderlyingType();
3613  }
3614  return nullptr;
3615 }
3616 
3617 static void
3619  QualType castType, ARCConversionTypeClass castACTC,
3620  Expr *castExpr, Expr *realCast,
3621  ARCConversionTypeClass exprACTC,
3623  SourceLocation loc =
3624  (castRange.isValid() ? castRange.getBegin() : castExpr->getExprLoc());
3625 
3627  UnavailableAttr::IR_ARCForbiddenConversion))
3628  return;
3629 
3630  QualType castExprType = castExpr->getType();
3631  // Defer emitting a diagnostic for bridge-related casts; that will be
3632  // handled by CheckObjCBridgeRelatedConversions.
3633  TypedefNameDecl *TDNDecl = nullptr;
3634  if ((castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable &&
3635  ObjCBridgeRelatedAttrFromType(castType, TDNDecl)) ||
3636  (exprACTC == ACTC_coreFoundation && castACTC == ACTC_retainable &&
3637  ObjCBridgeRelatedAttrFromType(castExprType, TDNDecl)))
3638  return;
3639 
3640  unsigned srcKind = 0;
3641  switch (exprACTC) {
3642  case ACTC_none:
3643  case ACTC_coreFoundation:
3644  case ACTC_voidPtr:
3645  srcKind = (castExprType->isPointerType() ? 1 : 0);
3646  break;
3647  case ACTC_retainable:
3648  srcKind = (castExprType->isBlockPointerType() ? 2 : 3);
3649  break;
3651  srcKind = 4;
3652  break;
3653  }
3654 
3655  // Check whether this could be fixed with a bridge cast.
3656  SourceLocation afterLParen = S.getLocForEndOfToken(castRange.getBegin());
3657  SourceLocation noteLoc = afterLParen.isValid() ? afterLParen : loc;
3658 
3659  unsigned convKindForDiag = Sema::isCast(CCK) ? 0 : 1;
3660 
3661  // Bridge from an ARC type to a CF type.
3662  if (castACTC == ACTC_retainable && isAnyRetainable(exprACTC)) {
3663 
3664  S.Diag(loc, diag::err_arc_cast_requires_bridge)
3665  << convKindForDiag
3666  << 2 // of C pointer type
3667  << castExprType
3668  << unsigned(castType->isBlockPointerType()) // to ObjC|block type
3669  << castType
3670  << castRange
3671  << castExpr->getSourceRange();
3672  bool br = S.isKnownName("CFBridgingRelease");
3673  ACCResult CreateRule =
3674  ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3675  assert(CreateRule != ACC_bottom && "This cast should already be accepted.");
3676  if (CreateRule != ACC_plusOne)
3677  {
3678  DiagnosticBuilder DiagB =
3679  (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3680  : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3681 
3682  addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3683  castType, castExpr, realCast, "__bridge ",
3684  nullptr);
3685  }
3686  if (CreateRule != ACC_plusZero)
3687  {
3688  DiagnosticBuilder DiagB =
3689  (CCK == Sema::CCK_OtherCast && !br) ?
3690  S.Diag(noteLoc, diag::note_arc_cstyle_bridge_transfer) << castExprType :
3691  S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3692  diag::note_arc_bridge_transfer)
3693  << castExprType << br;
3694 
3695  addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3696  castType, castExpr, realCast, "__bridge_transfer ",
3697  br ? "CFBridgingRelease" : nullptr);
3698  }
3699 
3700  return;
3701  }
3702 
3703  // Bridge from a CF type to an ARC type.
3704  if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC)) {
3705  bool br = S.isKnownName("CFBridgingRetain");
3706  S.Diag(loc, diag::err_arc_cast_requires_bridge)
3707  << convKindForDiag
3708  << unsigned(castExprType->isBlockPointerType()) // of ObjC|block type
3709  << castExprType
3710  << 2 // to C pointer type
3711  << castType
3712  << castRange
3713  << castExpr->getSourceRange();
3714  ACCResult CreateRule =
3715  ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3716  assert(CreateRule != ACC_bottom && "This cast should already be accepted.");
3717  if (CreateRule != ACC_plusOne)
3718  {
3719  DiagnosticBuilder DiagB =
3720  (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3721  : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3722  addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3723  castType, castExpr, realCast, "__bridge ",
3724  nullptr);
3725  }
3726  if (CreateRule != ACC_plusZero)
3727  {
3728  DiagnosticBuilder DiagB =
3729  (CCK == Sema::CCK_OtherCast && !br) ?
3730  S.Diag(noteLoc, diag::note_arc_cstyle_bridge_retained) << castType :
3731  S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3732  diag::note_arc_bridge_retained)
3733  << castType << br;
3734 
3735  addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3736  castType, castExpr, realCast, "__bridge_retained ",
3737  br ? "CFBridgingRetain" : nullptr);
3738  }
3739 
3740  return;
3741  }
3742 
3743  S.Diag(loc, diag::err_arc_mismatched_cast)
3744  << !convKindForDiag
3745  << srcKind << castExprType << castType
3746  << castRange << castExpr->getSourceRange();
3747 }
3748 
3749 template <typename TB>
3750 static bool CheckObjCBridgeNSCast(Sema &S, QualType castType, Expr *castExpr,
3751  bool &HadTheAttribute, bool warn) {
3752  QualType T = castExpr->getType();
3753  HadTheAttribute = false;
3754  while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3755  TypedefNameDecl *TDNDecl = TD->getDecl();
3756  if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3757  if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3758  HadTheAttribute = true;
3759  if (Parm->isStr("id"))
3760  return true;
3761 
3762  NamedDecl *Target = nullptr;
3763  // Check for an existing type with this name.
3766  if (S.LookupName(R, S.TUScope)) {
3767  Target = R.getFoundDecl();
3768  if (Target && isa<ObjCInterfaceDecl>(Target)) {
3769  ObjCInterfaceDecl *ExprClass = cast<ObjCInterfaceDecl>(Target);
3770  if (const ObjCObjectPointerType *InterfacePointerType =
3771  castType->getAsObjCInterfacePointerType()) {
3772  ObjCInterfaceDecl *CastClass
3773  = InterfacePointerType->getObjectType()->getInterface();
3774  if ((CastClass == ExprClass) ||
3775  (CastClass && CastClass->isSuperClassOf(ExprClass)))
3776  return true;
3777  if (warn)
3778  S.Diag(castExpr->getBeginLoc(), diag::warn_objc_invalid_bridge)
3779  << T << Target->getName() << castType->getPointeeType();
3780  return false;
3781  } else if (castType->isObjCIdType() ||
3783  castType, ExprClass)))
3784  // ok to cast to 'id'.
3785  // casting to id<p-list> is ok if bridge type adopts all of
3786  // p-list protocols.
3787  return true;
3788  else {
3789  if (warn) {
3790  S.Diag(castExpr->getBeginLoc(), diag::warn_objc_invalid_bridge)
3791  << T << Target->getName() << castType;
3792  S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3793  S.Diag(Target->getBeginLoc(), diag::note_declared_at);
3794  }
3795  return false;
3796  }
3797  }
3798  } else if (!castType->isObjCIdType()) {
3799  S.Diag(castExpr->getBeginLoc(),
3800  diag::err_objc_cf_bridged_not_interface)
3801  << castExpr->getType() << Parm;
3802  S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3803  if (Target)
3804  S.Diag(Target->getBeginLoc(), diag::note_declared_at);
3805  }
3806  return true;
3807  }
3808  return false;
3809  }
3810  T = TDNDecl->getUnderlyingType();
3811  }
3812  return true;
3813 }
3814 
3815 template <typename TB>
3816 static bool CheckObjCBridgeCFCast(Sema &S, QualType castType, Expr *castExpr,
3817  bool &HadTheAttribute, bool warn) {
3818  QualType T = castType;
3819  HadTheAttribute = false;
3820  while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3821  TypedefNameDecl *TDNDecl = TD->getDecl();
3822  if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3823  if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3824  HadTheAttribute = true;
3825  if (Parm->isStr("id"))
3826  return true;
3827 
3828  NamedDecl *Target = nullptr;
3829  // Check for an existing type with this name.
3832  if (S.LookupName(R, S.TUScope)) {
3833  Target = R.getFoundDecl();
3834  if (Target && isa<ObjCInterfaceDecl>(Target)) {
3835  ObjCInterfaceDecl *CastClass = cast<ObjCInterfaceDecl>(Target);
3836  if (const ObjCObjectPointerType *InterfacePointerType =
3837  castExpr->getType()->getAsObjCInterfacePointerType()) {
3838  ObjCInterfaceDecl *ExprClass
3839  = InterfacePointerType->getObjectType()->getInterface();
3840  if ((CastClass == ExprClass) ||
3841  (ExprClass && CastClass->isSuperClassOf(ExprClass)))
3842  return true;
3843  if (warn) {
3844  S.Diag(castExpr->getBeginLoc(),
3845  diag::warn_objc_invalid_bridge_to_cf)
3846  << castExpr->getType()->getPointeeType() << T;
3847  S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3848  }
3849  return false;
3850  } else if (castExpr->getType()->isObjCIdType() ||
3852  castExpr->getType(), CastClass)))
3853  // ok to cast an 'id' expression to a CFtype.
3854  // ok to cast an 'id<plist>' expression to CFtype provided plist
3855  // adopts all of CFtype's ObjetiveC's class plist.
3856  return true;
3857  else {
3858  if (warn) {
3859  S.Diag(castExpr->getBeginLoc(),
3860  diag::warn_objc_invalid_bridge_to_cf)
3861  << castExpr->getType() << castType;
3862  S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3863  S.Diag(Target->getBeginLoc(), diag::note_declared_at);
3864  }
3865  return false;
3866  }
3867  }
3868  }
3869  S.Diag(castExpr->getBeginLoc(),
3870  diag::err_objc_ns_bridged_invalid_cfobject)
3871  << castExpr->getType() << castType;
3872  S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3873  if (Target)
3874  S.Diag(Target->getBeginLoc(), diag::note_declared_at);
3875  return true;
3876  }
3877  return false;
3878  }
3879  T = TDNDecl->getUnderlyingType();
3880  }
3881  return true;
3882 }
3883 
3885  if (!getLangOpts().ObjC1)
3886  return;
3887  // warn in presence of __bridge casting to or from a toll free bridge cast.
3890  if (castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) {
3891  bool HasObjCBridgeAttr;
3892  bool ObjCBridgeAttrWillNotWarn =
3893  CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3894  false);
3895  if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
3896  return;
3897  bool HasObjCBridgeMutableAttr;
3898  bool ObjCBridgeMutableAttrWillNotWarn =
3899  CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3900  HasObjCBridgeMutableAttr, false);
3901  if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
3902  return;
3903 
3904  if (HasObjCBridgeAttr)
3905  CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3906  true);
3907  else if (HasObjCBridgeMutableAttr)
3908  CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3909  HasObjCBridgeMutableAttr, true);
3910  }
3911  else if (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable) {
3912  bool HasObjCBridgeAttr;
3913  bool ObjCBridgeAttrWillNotWarn =
3914  CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3915  false);
3916  if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
3917  return;
3918  bool HasObjCBridgeMutableAttr;
3919  bool ObjCBridgeMutableAttrWillNotWarn =
3920  CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3921  HasObjCBridgeMutableAttr, false);
3922  if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
3923  return;
3924 
3925  if (HasObjCBridgeAttr)
3926  CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3927  true);
3928  else if (HasObjCBridgeMutableAttr)
3929  CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3930  HasObjCBridgeMutableAttr, true);
3931  }
3932 }
3933 
3935  QualType SrcType = castExpr->getType();
3936  if (ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(castExpr)) {
3937  if (PRE->isExplicitProperty()) {
3938  if (ObjCPropertyDecl *PDecl = PRE->getExplicitProperty())
3939  SrcType = PDecl->getType();
3940  }
3941  else if (PRE->isImplicitProperty()) {
3942  if (ObjCMethodDecl *Getter = PRE->getImplicitPropertyGetter())
3943  SrcType = Getter->getReturnType();
3944  }
3945  }
3946 
3948  ARCConversionTypeClass castExprACTC = classifyTypeForARCConversion(castType);
3949  if (srcExprACTC != ACTC_retainable || castExprACTC != ACTC_coreFoundation)
3950  return;
3951  CheckObjCBridgeRelatedConversions(castExpr->getBeginLoc(), castType, SrcType,
3952  castExpr);
3953 }
3954 
3956  CastKind &Kind) {
3957  if (!getLangOpts().ObjC1)
3958  return false;
3959  ARCConversionTypeClass exprACTC =
3962  if ((castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) ||
3963  (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable)) {
3964  CheckTollFreeBridgeCast(castType, castExpr);
3965  Kind = (castACTC == ACTC_coreFoundation) ? CK_BitCast
3966  : CK_CPointerToObjCPointerCast;
3967  return true;
3968  }
3969  return false;
3970 }
3971 
3973  QualType DestType, QualType SrcType,
3974  ObjCInterfaceDecl *&RelatedClass,
3975  ObjCMethodDecl *&ClassMethod,
3976  ObjCMethodDecl *&InstanceMethod,
3977  TypedefNameDecl *&TDNDecl,
3978  bool CfToNs, bool Diagnose) {
3979  QualType T = CfToNs ? SrcType : DestType;
3980  ObjCBridgeRelatedAttr *ObjCBAttr = ObjCBridgeRelatedAttrFromType(T, TDNDecl);
3981  if (!ObjCBAttr)
3982  return false;
3983 
3984  IdentifierInfo *RCId = ObjCBAttr->getRelatedClass();
3985  IdentifierInfo *CMId = ObjCBAttr->getClassMethod();
3986  IdentifierInfo *IMId = ObjCBAttr->getInstanceMethod();
3987  if (!RCId)
3988  return false;
3989  NamedDecl *Target = nullptr;
3990  // Check for an existing type with this name.
3991  LookupResult R(*this, DeclarationName(RCId), SourceLocation(),
3993  if (!LookupName(R, TUScope)) {
3994  if (Diagnose) {
3995  Diag(Loc, diag::err_objc_bridged_related_invalid_class) << RCId
3996  << SrcType << DestType;
3997  Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3998  }
3999  return false;
4000  }
4001  Target = R.getFoundDecl();
4002  if (Target && isa<ObjCInterfaceDecl>(Target))
4003  RelatedClass = cast<ObjCInterfaceDecl>(Target);
4004  else {
4005  if (Diagnose) {
4006  Diag(Loc, diag::err_objc_bridged_related_invalid_class_name) << RCId
4007  << SrcType << DestType;
4008  Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4009  if (Target)
4010  Diag(Target->getBeginLoc(), diag::note_declared_at);
4011  }
4012  return false;
4013  }
4014 
4015  // Check for an existing class method with the given selector name.
4016  if (CfToNs && CMId) {
4017  Selector Sel = Context.Selectors.getUnarySelector(CMId);
4018  ClassMethod = RelatedClass->lookupMethod(Sel, false);
4019  if (!ClassMethod) {
4020  if (Diagnose) {
4021  Diag(Loc, diag::err_objc_bridged_related_known_method)
4022  << SrcType << DestType << Sel << false;
4023  Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4024  }
4025  return false;
4026  }
4027  }
4028 
4029  // Check for an existing instance method with the given selector name.
4030  if (!CfToNs && IMId) {
4031  Selector Sel = Context.Selectors.getNullarySelector(IMId);
4032  InstanceMethod = RelatedClass->lookupMethod(Sel, true);
4033  if (!InstanceMethod) {
4034  if (Diagnose) {
4035  Diag(Loc, diag::err_objc_bridged_related_known_method)
4036  << SrcType << DestType << Sel << true;
4037  Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4038  }
4039  return false;
4040  }
4041  }
4042  return true;
4043 }
4044 
4045 bool
4047  QualType DestType, QualType SrcType,
4048  Expr *&SrcExpr, bool Diagnose) {
4050  ARCConversionTypeClass lhsExprACTC = classifyTypeForARCConversion(DestType);
4051  bool CfToNs = (rhsExprACTC == ACTC_coreFoundation && lhsExprACTC == ACTC_retainable);
4052  bool NsToCf = (rhsExprACTC == ACTC_retainable && lhsExprACTC == ACTC_coreFoundation);
4053  if (!CfToNs && !NsToCf)
4054  return false;
4055 
4056  ObjCInterfaceDecl *RelatedClass;
4057  ObjCMethodDecl *ClassMethod = nullptr;
4058  ObjCMethodDecl *InstanceMethod = nullptr;
4059  TypedefNameDecl *TDNDecl = nullptr;
4060  if (!checkObjCBridgeRelatedComponents(Loc, DestType, SrcType, RelatedClass,
4061  ClassMethod, InstanceMethod, TDNDecl,
4062  CfToNs, Diagnose))
4063  return false;
4064 
4065  if (CfToNs) {
4066  // Implicit conversion from CF to ObjC object is needed.
4067  if (ClassMethod) {
4068  if (Diagnose) {
4069  std::string ExpressionString = "[";
4070  ExpressionString += RelatedClass->getNameAsString();
4071  ExpressionString += " ";
4072  ExpressionString += ClassMethod->getSelector().getAsString();
4073  SourceLocation SrcExprEndLoc =
4074  getLocForEndOfToken(SrcExpr->getEndLoc());
4075  // Provide a fixit: [RelatedClass ClassMethod SrcExpr]
4076  Diag(Loc, diag::err_objc_bridged_related_known_method)
4077  << SrcType << DestType << ClassMethod->getSelector() << false
4079  ExpressionString)
4080  << FixItHint::CreateInsertion(SrcExprEndLoc, "]");
4081  Diag(RelatedClass->getBeginLoc(), diag::note_declared_at);
4082  Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4083 
4084  QualType receiverType = Context.getObjCInterfaceType(RelatedClass);
4085  // Argument.
4086  Expr *args[] = { SrcExpr };
4087  ExprResult msg = BuildClassMessageImplicit(receiverType, false,
4088  ClassMethod->getLocation(),
4089  ClassMethod->getSelector(), ClassMethod,
4090  MultiExprArg(args, 1));
4091  SrcExpr = msg.get();
4092  }
4093  return true;
4094  }
4095  }
4096  else {
4097  // Implicit conversion from ObjC type to CF object is needed.
4098  if (InstanceMethod) {
4099  if (Diagnose) {
4100  std::string ExpressionString;
4101  SourceLocation SrcExprEndLoc =
4102  getLocForEndOfToken(SrcExpr->getEndLoc());
4103  if (InstanceMethod->isPropertyAccessor())
4104  if (const ObjCPropertyDecl *PDecl =
4105  InstanceMethod->findPropertyDecl()) {
4106  // fixit: ObjectExpr.propertyname when it is aproperty accessor.
4107  ExpressionString = ".";
4108  ExpressionString += PDecl->getNameAsString();
4109  Diag(Loc, diag::err_objc_bridged_related_known_method)
4110  << SrcType << DestType << InstanceMethod->getSelector() << true
4111  << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
4112  }
4113  if (ExpressionString.empty()) {
4114  // Provide a fixit: [ObjectExpr InstanceMethod]
4115  ExpressionString = " ";
4116  ExpressionString += InstanceMethod->getSelector().getAsString();
4117  ExpressionString += "]";
4118 
4119  Diag(Loc, diag::err_objc_bridged_related_known_method)
4120  << SrcType << DestType << InstanceMethod->getSelector() << true
4121  << FixItHint::CreateInsertion(SrcExpr->getBeginLoc(), "[")
4122  << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
4123  }
4124  Diag(RelatedClass->getBeginLoc(), diag::note_declared_at);
4125  Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4126 
4127  ExprResult msg =
4128  BuildInstanceMessageImplicit(SrcExpr, SrcType,
4129  InstanceMethod->getLocation(),
4130  InstanceMethod->getSelector(),
4131  InstanceMethod, None);
4132  SrcExpr = msg.get();
4133  }
4134  return true;
4135  }
4136  }
4137  return false;
4138 }
4139 
4143  bool Diagnose, bool DiagnoseCFAudited,
4144  BinaryOperatorKind Opc) {
4145  QualType castExprType = castExpr->getType();
4146 
4147  // For the purposes of the classification, we assume reference types
4148  // will bind to temporaries.
4149  QualType effCastType = castType;
4150  if (const ReferenceType *ref = castType->getAs<ReferenceType>())
4151  effCastType = ref->getPointeeType();
4152 
4153  ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExprType);
4154  ARCConversionTypeClass castACTC = classifyTypeForARCConversion(effCastType);
4155  if (exprACTC == castACTC) {
4156  // Check for viability and report error if casting an rvalue to a
4157  // life-time qualifier.
4158  if (castACTC == ACTC_retainable &&
4159  (CCK == CCK_CStyleCast || CCK == CCK_OtherCast) &&
4160  castType != castExprType) {
4161  const Type *DT = castType.getTypePtr();
4162  QualType QDT = castType;
4163  // We desugar some types but not others. We ignore those
4164  // that cannot happen in a cast; i.e. auto, and those which
4165  // should not be de-sugared; i.e typedef.
4166  if (const ParenType *PT = dyn_cast<ParenType>(DT))
4167  QDT = PT->desugar();
4168  else if (const TypeOfType *TP = dyn_cast<TypeOfType>(DT))
4169  QDT = TP->desugar();
4170  else if (const AttributedType *AT = dyn_cast<AttributedType>(DT))
4171  QDT = AT->desugar();
4172  if (QDT != castType &&
4174  if (Diagnose) {
4175  SourceLocation loc = (castRange.isValid() ? castRange.getBegin()
4176  : castExpr->getExprLoc());
4177  Diag(loc, diag::err_arc_nolifetime_behavior);
4178  }
4179  return ACR_error;
4180  }
4181  }
4182  return ACR_okay;
4183  }
4184 
4185  // The life-time qualifier cast check above is all we need for ObjCWeak.
4186  // ObjCAutoRefCount has more restrictions on what is legal.
4187  if (!getLangOpts().ObjCAutoRefCount)
4188  return ACR_okay;
4189 
4190  if (isAnyCLike(exprACTC) && isAnyCLike(castACTC)) return ACR_okay;
4191 
4192  // Allow all of these types to be cast to integer types (but not
4193  // vice-versa).
4194  if (castACTC == ACTC_none && castType->isIntegralType(Context))
4195  return ACR_okay;
4196 
4197  // Allow casts between pointers to lifetime types (e.g., __strong id*)
4198  // and pointers to void (e.g., cv void *). Casting from void* to lifetime*
4199  // must be explicit.
4200  if (exprACTC == ACTC_indirectRetainable && castACTC == ACTC_voidPtr)
4201  return ACR_okay;
4202  if (castACTC == ACTC_indirectRetainable && exprACTC == ACTC_voidPtr &&
4203  isCast(CCK))
4204  return ACR_okay;
4205 
4206  switch (ARCCastChecker(Context, exprACTC, castACTC, false).Visit(castExpr)) {
4207  // For invalid casts, fall through.
4208  case ACC_invalid:
4209  break;
4210 
4211  // Do nothing for both bottom and +0.
4212  case ACC_bottom:
4213  case ACC_plusZero:
4214  return ACR_okay;
4215 
4216  // If the result is +1, consume it here.
4217  case ACC_plusOne:
4218  castExpr = ImplicitCastExpr::Create(Context, castExpr->getType(),
4219  CK_ARCConsumeObject, castExpr,
4220  nullptr, VK_RValue);
4221  Cleanup.setExprNeedsCleanups(true);
4222  return ACR_okay;
4223  }
4224 
4225  // If this is a non-implicit cast from id or block type to a
4226  // CoreFoundation type, delay complaining in case the cast is used
4227  // in an acceptable context.
4228  if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC) && isCast(CCK))
4229  return ACR_unbridged;
4230 
4231  // Issue a diagnostic about a missing @-sign when implicit casting a cstring
4232  // to 'NSString *', instead of falling through to report a "bridge cast"
4233  // diagnostic.
4234  if (castACTC == ACTC_retainable && exprACTC == ACTC_none &&
4235  ConversionToObjCStringLiteralCheck(castType, castExpr, Diagnose))
4236  return ACR_error;
4237 
4238  // Do not issue "bridge cast" diagnostic when implicit casting
4239  // a retainable object to a CF type parameter belonging to an audited
4240  // CF API function. Let caller issue a normal type mismatched diagnostic
4241  // instead.
4242  if ((!DiagnoseCFAudited || exprACTC != ACTC_retainable ||
4243  castACTC != ACTC_coreFoundation) &&
4244  !(exprACTC == ACTC_voidPtr && castACTC == ACTC_retainable &&
4245  (Opc == BO_NE || Opc == BO_EQ))) {
4246  if (Diagnose)
4247  diagnoseObjCARCConversion(*this, castRange, castType, castACTC, castExpr,
4248  castExpr, exprACTC, CCK);
4249  return ACR_error;
4250  }
4251  return ACR_okay;
4252 }
4253 
4254 /// Given that we saw an expression with the ARCUnbridgedCastTy
4255 /// placeholder type, complain bitterly.
4257  // We expect the spurious ImplicitCastExpr to already have been stripped.
4258  assert(!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast));
4259  CastExpr *realCast = cast<CastExpr>(e->IgnoreParens());
4260 
4261  SourceRange castRange;
4262  QualType castType;
4264 
4265  if (CStyleCastExpr *cast = dyn_cast<CStyleCastExpr>(realCast)) {
4266  castRange = SourceRange(cast->getLParenLoc(), cast->getRParenLoc());
4267  castType = cast->getTypeAsWritten();
4268  CCK = CCK_CStyleCast;
4269  } else if (ExplicitCastExpr *cast = dyn_cast<ExplicitCastExpr>(realCast)) {
4270  castRange = cast->getTypeInfoAsWritten()->getTypeLoc().getSourceRange();
4271  castType = cast->getTypeAsWritten();
4272  CCK = CCK_OtherCast;
4273  } else {
4274  llvm_unreachable("Unexpected ImplicitCastExpr");
4275  }
4276 
4277  ARCConversionTypeClass castACTC =
4279 
4280  Expr *castExpr = realCast->getSubExpr();
4281  assert(classifyTypeForARCConversion(castExpr->getType()) == ACTC_retainable);
4282 
4283  diagnoseObjCARCConversion(*this, castRange, castType, castACTC,
4284  castExpr, realCast, ACTC_retainable, CCK);
4285 }
4286 
4287 /// stripARCUnbridgedCast - Given an expression of ARCUnbridgedCast
4288 /// type, remove the placeholder cast.
4290  assert(e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast));
4291 
4292  if (ParenExpr *pe = dyn_cast<ParenExpr>(e)) {
4293  Expr *sub = stripARCUnbridgedCast(pe->getSubExpr());
4294  return new (Context) ParenExpr(pe->getLParen(), pe->getRParen(), sub);
4295  } else if (UnaryOperator *uo = dyn_cast<UnaryOperator>(e)) {
4296  assert(uo->getOpcode() == UO_Extension);
4297  Expr *sub = stripARCUnbridgedCast(uo->getSubExpr());
4298  return new (Context)
4299  UnaryOperator(sub, UO_Extension, sub->getType(), sub->getValueKind(),
4300  sub->getObjectKind(), uo->getOperatorLoc(), false);
4301  } else if (GenericSelectionExpr *gse = dyn_cast<GenericSelectionExpr>(e)) {
4302  assert(!gse->isResultDependent());
4303 
4304  unsigned n = gse->getNumAssocs();
4305  SmallVector<Expr*, 4> subExprs(n);
4306  SmallVector<TypeSourceInfo*, 4> subTypes(n);
4307  for (unsigned i = 0; i != n; ++i) {
4308  subTypes[i] = gse->getAssocTypeSourceInfo(i);
4309  Expr *sub = gse->getAssocExpr(i);
4310  if (i == gse->getResultIndex())
4311  sub = stripARCUnbridgedCast(sub);
4312  subExprs[i] = sub;
4313  }
4314 
4315  return new (Context) GenericSelectionExpr(Context, gse->getGenericLoc(),
4316  gse->getControllingExpr(),
4317  subTypes, subExprs,
4318  gse->getDefaultLoc(),
4319  gse->getRParenLoc(),
4320  gse->containsUnexpandedParameterPack(),
4321  gse->getResultIndex());
4322  } else {
4323  assert(isa<ImplicitCastExpr>(e) && "bad form of unbridged cast!");
4324  return cast<ImplicitCastExpr>(e)->getSubExpr();
4325  }
4326 }
4327 
4329  QualType exprType) {
4330  QualType canCastType =
4331  Context.getCanonicalType(castType).getUnqualifiedType();
4332  QualType canExprType =
4333  Context.getCanonicalType(exprType).getUnqualifiedType();
4334  if (isa<ObjCObjectPointerType>(canCastType) &&
4335  castType.getObjCLifetime() == Qualifiers::OCL_Weak &&
4336  canExprType->isObjCObjectPointerType()) {
4337  if (const ObjCObjectPointerType *ObjT =
4338  canExprType->getAs<ObjCObjectPointerType>())
4339  if (const ObjCInterfaceDecl *ObjI = ObjT->getInterfaceDecl())
4340  return !ObjI->isArcWeakrefUnavailable();
4341  }
4342  return true;
4343 }
4344 
4345 /// Look for an ObjCReclaimReturnedObject cast and destroy it.
4347  Expr *curExpr = e, *prevExpr = nullptr;
4348 
4349  // Walk down the expression until we hit an implicit cast of kind
4350  // ARCReclaimReturnedObject or an Expr that is neither a Paren nor a Cast.
4351  while (true) {
4352  if (auto *pe = dyn_cast<ParenExpr>(curExpr)) {
4353  prevExpr = curExpr;
4354  curExpr = pe->getSubExpr();
4355  continue;
4356  }
4357 
4358  if (auto *ce = dyn_cast<CastExpr>(curExpr)) {
4359  if (auto *ice = dyn_cast<ImplicitCastExpr>(ce))
4360  if (ice->getCastKind() == CK_ARCReclaimReturnedObject) {
4361  if (!prevExpr)
4362  return ice->getSubExpr();
4363  if (auto *pe = dyn_cast<ParenExpr>(prevExpr))
4364  pe->setSubExpr(ice->getSubExpr());
4365  else
4366  cast<CastExpr>(prevExpr)->setSubExpr(ice->getSubExpr());
4367  return e;
4368  }
4369 
4370  prevExpr = curExpr;
4371  curExpr = ce->getSubExpr();
4372  continue;
4373  }
4374 
4375  // Break out of the loop if curExpr is neither a Paren nor a Cast.
4376  break;
4377  }
4378 
4379  return e;
4380 }
4381 
4384  SourceLocation BridgeKeywordLoc,
4385  TypeSourceInfo *TSInfo,
4386  Expr *SubExpr) {
4387  ExprResult SubResult = UsualUnaryConversions(SubExpr);
4388  if (SubResult.isInvalid()) return ExprError();
4389  SubExpr = SubResult.get();
4390 
4391  QualType T = TSInfo->getType();
4392  QualType FromType = SubExpr->getType();
4393 
4394  CastKind CK;
4395 
4396  bool MustConsume = false;
4397  if (T->isDependentType() || SubExpr->isTypeDependent()) {
4398  // Okay: we'll build a dependent expression type.
4399  CK = CK_Dependent;
4400  } else if (T->isObjCARCBridgableType() && FromType->isCARCBridgableType()) {
4401  // Casting CF -> id
4402  CK = (T->isBlockPointerType() ? CK_AnyPointerToBlockPointerCast
4403  : CK_CPointerToObjCPointerCast);
4404  switch (Kind) {
4405  case OBC_Bridge:
4406  break;
4407 
4408  case OBC_BridgeRetained: {
4409  bool br = isKnownName("CFBridgingRelease");
4410  Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4411  << 2
4412  << FromType
4413  << (T->isBlockPointerType()? 1 : 0)
4414  << T
4415  << SubExpr->getSourceRange()
4416  << Kind;
4417  Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4418  << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge");
4419  Diag(BridgeKeywordLoc, diag::note_arc_bridge_transfer)
4420  << FromType << br
4421  << FixItHint::CreateReplacement(BridgeKeywordLoc,
4422  br ? "CFBridgingRelease "
4423  : "__bridge_transfer ");
4424 
4425  Kind = OBC_Bridge;
4426  break;
4427  }
4428 
4429  case OBC_BridgeTransfer:
4430  // We must consume the Objective-C object produced by the cast.
4431  MustConsume = true;
4432  break;
4433  }
4434  } else if (T->isCARCBridgableType() && FromType->isObjCARCBridgableType()) {
4435  // Okay: id -> CF
4436  CK = CK_BitCast;
4437  switch (Kind) {
4438  case OBC_Bridge:
4439  // Reclaiming a value that's going to be __bridge-casted to CF
4440  // is very dangerous, so we don't do it.
4441  SubExpr = maybeUndoReclaimObject(SubExpr);
4442  break;
4443 
4444  case OBC_BridgeRetained:
4445  // Produce the object before casting it.
4446  SubExpr = ImplicitCastExpr::Create(Context, FromType,
4447  CK_ARCProduceObject,
4448  SubExpr, nullptr, VK_RValue);
4449  break;
4450 
4451  case OBC_BridgeTransfer: {
4452  bool br = isKnownName("CFBridgingRetain");
4453  Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4454  << (FromType->isBlockPointerType()? 1 : 0)
4455  << FromType
4456  << 2
4457  << T
4458  << SubExpr->getSourceRange()
4459  << Kind;
4460 
4461  Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4462  << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge ");
4463  Diag(BridgeKeywordLoc, diag::note_arc_bridge_retained)
4464  << T << br
4465  << FixItHint::CreateReplacement(BridgeKeywordLoc,
4466  br ? "CFBridgingRetain " : "__bridge_retained");
4467 
4468  Kind = OBC_Bridge;
4469  break;
4470  }
4471  }
4472  } else {
4473  Diag(LParenLoc, diag::err_arc_bridge_cast_incompatible)
4474  << FromType << T << Kind
4475  << SubExpr->getSourceRange()
4476  << TSInfo->getTypeLoc().getSourceRange();
4477  return ExprError();
4478  }
4479 
4480  Expr *Result = new (Context) ObjCBridgedCastExpr(LParenLoc, Kind, CK,
4481  BridgeKeywordLoc,
4482  TSInfo, SubExpr);
4483 
4484  if (MustConsume) {
4485  Cleanup.setExprNeedsCleanups(true);
4486  Result = ImplicitCastExpr::Create(Context, T, CK_ARCConsumeObject, Result,
4487  nullptr, VK_RValue);
4488  }
4489 
4490  return Result;
4491 }
4492 
4494  SourceLocation LParenLoc,
4496  SourceLocation BridgeKeywordLoc,
4497  ParsedType Type,
4498  SourceLocation RParenLoc,
4499  Expr *SubExpr) {
4500  TypeSourceInfo *TSInfo = nullptr;
4501  QualType T = GetTypeFromParser(Type, &TSInfo);
4502  if (Kind == OBC_Bridge)
4503  CheckTollFreeBridgeCast(T, SubExpr);
4504  if (!TSInfo)
4505  TSInfo = Context.getTrivialTypeSourceInfo(T, LParenLoc);
4506  return BuildObjCBridgedCast(LParenLoc, Kind, BridgeKeywordLoc, TSInfo,
4507  SubExpr);
4508 }
ObjCPropertyRefExpr - A dot-syntax expression to access an ObjC property.
Definition: ExprObjC.h:649
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:1544
const internal::VariadicAllOfMatcher< Type > type
Matches Types in the clang AST.
Defines the clang::ASTContext interface.
ObjCMethodDecl * lookupPrivateClassMethod(const Selector &Sel)
Definition: DeclObjC.h:1859
bool hasDefinition() const
Determine whether this class has been defined.
Definition: DeclObjC.h:1532
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:1722
Stmt * body_back()
Definition: Stmt.h:673
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:1853
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:2397
QualType getPointeeType() const
Definition: Type.h:2410
CanQualType VoidPtrTy
Definition: ASTContext.h:1051
A (possibly-)qualified type.
Definition: Type.h:640
bool isBlockPointerType() const
Definition: Type.h:6125
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:1153
Simple class containing the result of Sema::CorrectTypo.
unsigned param_size() const
Definition: DeclObjC.h:349
Selector getSelector() const
Definition: ExprObjC.cpp:312
ObjCInterfaceDecl * getClassInterface()
Definition: DeclObjC.cpp:1136
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:9310
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:940
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:3016
CompoundStmt * getSubStmt()
Definition: Expr.h:3820
CanQualType Char32Ty
Definition: ASTContext.h:1031
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:8182
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:472
static bool CheckObjCBridgeNSCast(Sema &S, QualType castType, Expr *castExpr, bool &HadTheAttribute, bool warn)
void addConst()
Add the const type qualifier to this QualType.
Definition: Type.h:809
bool isObjCARCBridgableType() const
Determine whether the given type T is a "bridgable" Objective-C type, which is either an Objective-C ...
Definition: Type.cpp:3967
bool isRecordType() const
Definition: Type.h:6190
bool isAscii() const
Definition: Expr.h:1724
static InitializedEntity InitializeParameter(ASTContext &Context, const ParmVarDecl *Parm)
Create the initialization entity for a parameter.
const ObjCObjectType * getAsObjCInterfaceType() const
Definition: Type.cpp:1596
SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID)
Emit a diagnostic.
Definition: Sema.h:1281
Decl - This represents one declaration (or definition), e.g.
Definition: DeclBase.h:86
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: DeclBase.h:413
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:6206
StringRef P
Scope * TUScope
Translation Unit Scope - useful to Objective-C actions that need to lookup file scope declarations in...
Definition: Sema.h:806
ParenExpr - This represents a parethesized expression, e.g.
Definition: Expr.h:1805
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:6066
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:1413
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:2672
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:883
const ObjCObjectPointerType * getAsObjCInterfacePointerType() const
Definition: Type.cpp:1604
static ExprValueKind getValueKindForType(QualType T)
getValueKindForType - Given a formal return or parameter type, give its value kind.
Definition: Expr.h:395
QualType withConst() const
Definition: Type.h:812
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:3972
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:1449
QualType getElementType() const
Definition: Type.h:2707
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:96
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:820
QualType getReturnType() const
Definition: Decl.h:2276
DiagnosticsEngine & Diags
Definition: Sema.h:321
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:6530
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:555
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:1137
static StringRef bytes(const std::vector< T, Allocator > &v)
Definition: ASTWriter.cpp:120
Represents a parameter to a function.
Definition: Decl.h:1541
ObjCPropertyDecl * getExplicitProperty() const
Definition: ExprObjC.h:742
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:3730
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:3130
Represents a struct/union/class.
Definition: Decl.h:3572
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:838
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:3604
An element in an Objective-C dictionary literal.
Definition: ExprObjC.h:271
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:5359
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:1844
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:153
void setObjCConstantStringInterface(ObjCInterfaceDecl *Decl)
A C-style cast.
Definition: Sema.h:9306
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:740
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Stmt.cpp:280
bool isObjCIdType() const
Definition: Type.h:6243
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:1576
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:16473
LookupResultKind getResultKind() const
Definition: Lookup.h:310
static ObjCBridgeRelatedAttr * ObjCBridgeRelatedAttrFromType(QualType T, TypedefNameDecl *&TDNDecl)
Expr * getSubExpr()
Definition: Expr.h:3000
bool isObjCQualifiedClassType() const
Definition: Type.h:6237
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:564
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:978
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:1448
ObjCContainerDecl - Represents a container for method declarations.
Definition: DeclObjC.h:966
ObjCMethodDecl * getCurMethodDecl()
getCurMethodDecl - If inside of a method body, this returns a pointer to the method decl for the meth...
Definition: Sema.cpp:1199
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:6579
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:1630
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Decl.h:2880
const ObjCObjectPointerType * getAsObjCQualifiedClassType() const
Definition: Type.cpp:1586
GlobalMethodPool MethodPool
Method Pool - allows efficient lookup when typechecking messages to "id".
Definition: Sema.h:1133
Represents a declaration of a type.
Definition: Decl.h:2849
A builtin binary operation expression such as "x + y" or "x <= y".
Definition: Expr.h:3263
CanQualType PseudoObjectTy
Definition: ASTContext.h:1054
tokloc_iterator tokloc_end() const
Definition: Expr.h:1775
A conversion for an operand of a builtin overloaded operator.
Definition: Sema.h:9312
CheckedConversionKind
The kind of conversion being performed.
Definition: Sema.h:9302
Expr * IgnoreParenCasts() LLVM_READONLY
IgnoreParenCasts - Ignore parentheses and casts.
Definition: Expr.cpp:2544
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:2207
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:5893
void getOverriddenMethods(SmallVectorImpl< const ObjCMethodDecl *> &Overridden) const
Return overridden methods for the given Method.
Definition: DeclObjC.cpp:1277
ObjCMethodDecl * lookupClassMethod(Selector Sel) const
Lookup a class method for a given selector.
Definition: DeclObjC.h:1849
void CheckTollFreeBridgeCast(QualType castType, Expr *castExpr)
CastExpr - Base class for type casts, including both implicit casts (ImplicitCastExpr) and explicit c...
Definition: Expr.h:2935
Represents an Objective-C protocol declaration.
Definition: DeclObjC.h:2061
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:841
const LangOptions & getLangOpts() const
Definition: Sema.h:1204
ExprResult BuildObjCDictionaryLiteral(SourceRange SR, MutableArrayRef< ObjCDictionaryElement > Elements)
bool isTypeDependent() const
isTypeDependent - Determines whether this expression is type-dependent (C++ [temp.dep.expr]), which means that its type could change from one template instantiation to the next.
Definition: Expr.h:167
Represents an ObjC class declaration.
Definition: DeclObjC.h:1169
Bridging via __bridge_transfer, which transfers ownership of an Objective-C pointer into ARC...
QualType getReturnType() const
Definition: DeclObjC.h:331
ObjCInterfaceDecl * getInterface() const
Gets the interface declaration for this object type, if the base type really is an interface...
Definition: Type.h:5594
SourceLocation OrigLoc
Definition: Commit.h:41
QualType getObjCProtoType() const
Retrieve the type of the Objective-C Protocol class.
Definition: ASTContext.h:1899
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:879
const LangOptions & LangOpts
Definition: Sema.h:317
bool isKnownName(StringRef name)
ObjCMethodDecl * getCategoryClassMethod(Selector Sel) const
Definition: DeclObjC.cpp:1682
static bool isAnyRetainable(ARCConversionTypeClass ACTC)
bool hasAttr() const
Definition: DeclBase.h:544
ConditionalOperator - The ?: ternary operator.
Definition: Expr.h:3561
Sema - This implements semantic analysis and AST building for C.
Definition: Sema.h:277
RecordDecl * getMostRecentDecl()
Definition: Decl.h:3619
StringRef getString() const
Definition: Expr.h:1681
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:9308
int, void, struct A
const ObjCObjectType * getSuperClassType() const
Retrieve the superclass type.
Definition: DeclObjC.h:1562
Expr * IgnoreParenNoopCasts(ASTContext &Ctx) LLVM_READONLY
IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the value (including ptr->int ...
Definition: Expr.cpp:2664
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:5259
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:1785
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:2195
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
Expr - This represents one expression.
Definition: Expr.h:106
ObjCMethodList * getNext() const
static ObjCMethodDecl * Create(ASTContext &C, SourceLocation beginLoc, SourceLocation endLoc, Selector SelInfo, QualType T, TypeSourceInfo *ReturnTInfo, DeclContext *contextDecl, bool isInstance=true, bool isVariadic=false, bool isPropertyAccessor=false, bool isImplicitlyDeclared=false, bool isDefined=false, ImplementationControl impControl=None, bool HasRelatedResultType=false)
Definition: DeclObjC.cpp: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:4299
const T * castAs() const
Member-template castAs<specific type>.
Definition: Type.h:6593
static bool isAnyCLike(ARCConversionTypeClass ACTC)
bool isObjCRetainableType() const
Definition: Type.cpp:3938
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:6249
DeclContext * getDeclContext()
Definition: DeclBase.h:434
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:477
ExprResult CheckPlaceholderExpr(Expr *E)
Check for operands with placeholder types and complain if found.
Definition: SemaExpr.cpp:16360
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:847
Defines the clang::TypeLoc interface and its subclasses.
IdentifierInfo * getAsIdentifierInfo() const
getAsIdentifierInfo - Retrieve the IdentifierInfo * stored in this declaration name, or NULL if this declaration name isn&#39;t a simple identifier.
Specifies that a value-dependent expression of integral or dependent type should be considered a null...
Definition: Expr.h:709
bool isInvalid() const
QualType getType() const
Definition: Expr.h:128
static Optional< NullabilityKind > stripOuterNullability(QualType &T)
Strip off the top-level nullability annotation on the given type, if it&#39;s there.
Definition: Type.cpp:3850
DefinitionKind hasDefinition(ASTContext &) const
Check whether this variable is defined in this translation unit.
Definition: Decl.cpp:2121
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:992
ObjCMethodDecl * getImplicitPropertyGetter() const
Definition: ExprObjC.h:747
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:1865
bool isInstanceMethod() const
Definition: DeclObjC.h:422
ArraySizeModifier getSizeModifier() const
Definition: Type.h:2709
bool rewriteObjCRedundantCallWithLiteral(const ObjCMessageExpr *Msg, const NSAPI &NS, Commit &commit)
unsigned getNumArgs() const
ValueDecl * getDecl()
Definition: Expr.h:1065
bool isUsable() const
Definition: Ownership.h:171
Selector getSelector() const
Definition: DeclObjC.h:329
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:1400
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:3187
bool isNull() const
Return true if this QualType doesn&#39;t point to a type yet.
Definition: Type.h:705
ImplicitParamDecl * getSelfDecl() const
Definition: DeclObjC.h:414
const SourceManager & SM
Definition: Format.cpp:1475
SourceLocation getEndLoc() const LLVM_READONLY
Definition: Stmt.cpp:293
static InitializationKind CreateCopy(SourceLocation InitLoc, SourceLocation EqualLoc, bool AllowExplicitConvs=false)
Create a copy initialization.
bool isConstQualified() const
Determine whether this type is const-qualified.
Definition: Type.h:5952
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:1569
There is no lifetime qualification on this type.
Definition: Type.h:156
static bool isMethodDeclaredInRootProtocol(Sema &S, const ObjCMethodDecl *M)
std::string getAsString() const
Derive the full selector name (e.g.
ARCConversionResult
Definition: Sema.h:9734
SelectorTable & Selectors
Definition: ASTContext.h:565
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:5441
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:3368
Encodes a location in the source.
ObjCInterfaceDecl * getDecl() const
Get the declaration of this interface.
Definition: Type.h:5572
Sugar for parentheses used when specifying types.
Definition: Type.h:2367
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:4165
Expr * getSubExpr() const
Definition: Expr.h:1892
Represents typeof(type), a GCC extension.
Definition: Type.h:3988
Interfaces are the core concept in Objective-C for object oriented design.
Definition: Type.h:5559
CastKind getCastKind() const
Definition: Expr.h:2994
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:1410
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:1863
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:143
bool isIntegralType(const ASTContext &Ctx) const
Determine whether this type is an integral type.
Definition: Type.cpp:1763
const ConstantArrayType * getAsConstantArrayType(QualType T) const
Definition: ASTContext.h:2417
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:533
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:9315
Specifies that a value-dependent expression should be considered to never be a null pointer constant...
Definition: Expr.h:713
ObjCProtocolExpr used for protocol expression in Objective-C.
Definition: ExprObjC.h:530
Describes the kind of initialization being performed, along with location information for tokens rela...
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Expr.h:1781
ExprResult ActOnClassPropertyRefExpr(IdentifierInfo &receiverName, IdentifierInfo &propertyName, SourceLocation receiverNameLoc, SourceLocation propertyNameLoc)
bool isObjCObjectPointerType() const
Definition: Type.h:6214
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:726
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:1807
No entity found met the criteria.
Definition: Lookup.h:51
QualType getAttributedType(AttributedType::Kind attrKind, QualType modifiedType, QualType equivalentType)
bool ObjCIsDesignatedInit
True when this is a method marked as a designated initializer.
Definition: ScopeInfo.h:138
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:1391
bool isVectorType() const
Definition: Type.h:6202
StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}).
Definition: Expr.h:3804
ObjCBoxedExpr - used for generalized expression boxing.
Definition: ExprObjC.h:133
SourceRange getSourceRange() const override LLVM_READONLY
Source range that this declaration covers.
Definition: DeclObjC.h:293
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:2297
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:832
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:1734
Represents a C11 generic selection.
Definition: Expr.h:5120
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:1687
Base class for declarations which introduce a typedef-name.
Definition: Decl.h:2895
Expr * getResultExpr()
Return the result-bearing expression, or null if there is none.
Definition: Expr.h:5496
CanQualType CharTy
Definition: ASTContext.h:1025
ExprResult PerformCopyInitialization(const InitializedEntity &Entity, SourceLocation EqualLoc, ExprResult Init, bool TopLevelOfInitList=false, bool AllowExplicit=false)
Definition: SemaInit.cpp:8970
CanQualType ObjCBuiltinIdTy
Definition: ASTContext.h:1055
static ParmVarDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, SourceLocation IdLoc, IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo, StorageClass S, Expr *DefArg)
Definition: Decl.cpp:2501
Dataflow Directional Tag Classes.
bool isValid() const
Return true if this is a valid SourceLocation object.
tokloc_iterator tokloc_begin() const
Definition: Expr.h:1774
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:1272
ObjCMethodDecl * NSNumberLiteralMethods[NSAPI::NumNSNumberLiteralMethods]
The Objective-C NSNumber methods used to create NSNumber literals.
Definition: Sema.h:853
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:148
QualType getUnderlyingType() const
Definition: Decl.h:2950
static FixItHint CreateRemoval(CharSourceRange RemoveRange)
Create a code modification hint that removes the given source range.
Definition: Diagnostic.h:118
DeclarationName - 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:973
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:152
ExplicitCastExpr - An explicit cast written in the source code.
Definition: Expr.h:3153
DeclarationNameInfo - A collector data type for bundling together a DeclarationName and the correspnd...
Bridging via __bridge_retain, which makes an ARC object available as a +1 C pointer.
ACCResult
A result from the cast checker.
Expr * IgnoreParenImpCasts() LLVM_READONLY
IgnoreParenImpCasts - Ignore parentheses and implicit casts.
Definition: Expr.cpp:2631
ExprResult BuildInstanceMessage(Expr *Receiver, QualType ReceiverType, SourceLocation SuperLoc, Selector Sel, ObjCMethodDecl *Method, SourceLocation LBracLoc, ArrayRef< SourceLocation > SelectorLocs, SourceLocation RBracLoc, MultiExprArg Args, bool isImplicit=false)
Build an Objective-C i