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
14 #include "clang/Sema/SemaInternal.h"
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"
20 #include "clang/Analysis/DomainSpecific/CocoaConventions.h"
21 #include "clang/Edit/Commit.h"
22 #include "clang/Edit/Rewriters.h"
23 #include "clang/Lex/Preprocessor.h"
24 #include "clang/Sema/Initialization.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
ParseObjCStringLiteral(SourceLocation * AtLocs,Expr ** strings,unsigned NumStrings)34 ExprResult Sema::ParseObjCStringLiteral(SourceLocation *AtLocs,
35 Expr **strings,
36 unsigned NumStrings) {
37 StringLiteral **Strings = reinterpret_cast<StringLiteral**>(strings);
38
39 // Most ObjC strings are formed out of a single piece. However, we *can*
40 // have strings formed out of multiple @ strings with multiple pptokens in
41 // each one, e.g. @"foo" "bar" @"baz" "qux" which need to be turned into one
42 // StringLiteral for ObjCStringLiteral to hold onto.
43 StringLiteral *S = Strings[0];
44
45 // If we have a multi-part string, merge it all together.
46 if (NumStrings != 1) {
47 // Concatenate objc strings.
48 SmallString<128> StrBuf;
49 SmallVector<SourceLocation, 8> StrLocs;
50
51 for (unsigned i = 0; i != NumStrings; ++i) {
52 S = Strings[i];
53
54 // ObjC strings can't be wide or UTF.
55 if (!S->isAscii()) {
56 Diag(S->getLocStart(), diag::err_cfstring_literal_not_string_constant)
57 << S->getSourceRange();
58 return true;
59 }
60
61 // Append the string.
62 StrBuf += S->getString();
63
64 // Get the locations of the string tokens.
65 StrLocs.append(S->tokloc_begin(), S->tokloc_end());
66 }
67
68 // Create the aggregate string with the appropriate content and location
69 // information.
70 const ConstantArrayType *CAT = Context.getAsConstantArrayType(S->getType());
71 assert(CAT && "String literal not of constant array type!");
72 QualType StrTy = Context.getConstantArrayType(
73 CAT->getElementType(), llvm::APInt(32, StrBuf.size() + 1),
74 CAT->getSizeModifier(), CAT->getIndexTypeCVRQualifiers());
75 S = StringLiteral::Create(Context, StrBuf, StringLiteral::Ascii,
76 /*Pascal=*/false, StrTy, &StrLocs[0],
77 StrLocs.size());
78 }
79
80 return BuildObjCStringLiteral(AtLocs[0], S);
81 }
82
BuildObjCStringLiteral(SourceLocation AtLoc,StringLiteral * S)83 ExprResult Sema::BuildObjCStringLiteral(SourceLocation AtLoc, StringLiteral *S){
84 // Verify that this composite string is acceptable for ObjC strings.
85 if (CheckObjCString(S))
86 return true;
87
88 // Initialize the constant string interface lazily. This assumes
89 // the NSString interface is seen in this translation unit. Note: We
90 // don't use NSConstantString, since the runtime team considers this
91 // interface private (even though it appears in the header files).
92 QualType Ty = Context.getObjCConstantStringInterface();
93 if (!Ty.isNull()) {
94 Ty = Context.getObjCObjectPointerType(Ty);
95 } else if (getLangOpts().NoConstantCFStrings) {
96 IdentifierInfo *NSIdent=nullptr;
97 std::string StringClass(getLangOpts().ObjCConstantStringClass);
98
99 if (StringClass.empty())
100 NSIdent = &Context.Idents.get("NSConstantString");
101 else
102 NSIdent = &Context.Idents.get(StringClass);
103
104 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc,
105 LookupOrdinaryName);
106 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
107 Context.setObjCConstantStringInterface(StrIF);
108 Ty = Context.getObjCConstantStringInterface();
109 Ty = Context.getObjCObjectPointerType(Ty);
110 } else {
111 // If there is no NSConstantString interface defined then treat this
112 // as error and recover from it.
113 Diag(S->getLocStart(), diag::err_no_nsconstant_string_class) << NSIdent
114 << S->getSourceRange();
115 Ty = Context.getObjCIdType();
116 }
117 } else {
118 IdentifierInfo *NSIdent = NSAPIObj->getNSClassId(NSAPI::ClassId_NSString);
119 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc,
120 LookupOrdinaryName);
121 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
122 Context.setObjCConstantStringInterface(StrIF);
123 Ty = Context.getObjCConstantStringInterface();
124 Ty = Context.getObjCObjectPointerType(Ty);
125 } else {
126 // If there is no NSString interface defined, implicitly declare
127 // a @class NSString; and use that instead. This is to make sure
128 // type of an NSString literal is represented correctly, instead of
129 // being an 'id' type.
130 Ty = Context.getObjCNSStringType();
131 if (Ty.isNull()) {
132 ObjCInterfaceDecl *NSStringIDecl =
133 ObjCInterfaceDecl::Create (Context,
134 Context.getTranslationUnitDecl(),
135 SourceLocation(), NSIdent,
136 nullptr, nullptr, SourceLocation());
137 Ty = Context.getObjCInterfaceType(NSStringIDecl);
138 Context.setObjCNSStringType(Ty);
139 }
140 Ty = Context.getObjCObjectPointerType(Ty);
141 }
142 }
143
144 return new (Context) ObjCStringLiteral(S, Ty, AtLoc);
145 }
146
147 /// \brief Emits an error if the given method does not exist, or if the return
148 /// type is not an Objective-C object.
validateBoxingMethod(Sema & S,SourceLocation Loc,const ObjCInterfaceDecl * Class,Selector Sel,const ObjCMethodDecl * Method)149 static bool validateBoxingMethod(Sema &S, SourceLocation Loc,
150 const ObjCInterfaceDecl *Class,
151 Selector Sel, const ObjCMethodDecl *Method) {
152 if (!Method) {
153 // FIXME: Is there a better way to avoid quotes than using getName()?
154 S.Diag(Loc, diag::err_undeclared_boxing_method) << Sel << Class->getName();
155 return false;
156 }
157
158 // Make sure the return type is reasonable.
159 QualType ReturnType = Method->getReturnType();
160 if (!ReturnType->isObjCObjectPointerType()) {
161 S.Diag(Loc, diag::err_objc_literal_method_sig)
162 << Sel;
163 S.Diag(Method->getLocation(), diag::note_objc_literal_method_return)
164 << ReturnType;
165 return false;
166 }
167
168 return true;
169 }
170
171 /// \brief Maps ObjCLiteralKind to NSClassIdKindKind
ClassKindFromLiteralKind(Sema::ObjCLiteralKind LiteralKind)172 static NSAPI::NSClassIdKindKind ClassKindFromLiteralKind(
173 Sema::ObjCLiteralKind LiteralKind) {
174 switch (LiteralKind) {
175 case Sema::LK_Array:
176 return NSAPI::ClassId_NSArray;
177 case Sema::LK_Dictionary:
178 return NSAPI::ClassId_NSDictionary;
179 case Sema::LK_Numeric:
180 return NSAPI::ClassId_NSNumber;
181 case Sema::LK_String:
182 return NSAPI::ClassId_NSString;
183 case Sema::LK_Boxed:
184 return NSAPI::ClassId_NSValue;
185
186 // there is no corresponding matching
187 // between LK_None/LK_Block and NSClassIdKindKind
188 case Sema::LK_Block:
189 case Sema::LK_None:
190 break;
191 }
192 llvm_unreachable("LiteralKind can't be converted into a ClassKind");
193 }
194
195 /// \brief Validates ObjCInterfaceDecl availability.
196 /// ObjCInterfaceDecl, used to create ObjC literals, should be defined
197 /// if clang not in a debugger mode.
ValidateObjCLiteralInterfaceDecl(Sema & S,ObjCInterfaceDecl * Decl,SourceLocation Loc,Sema::ObjCLiteralKind LiteralKind)198 static bool ValidateObjCLiteralInterfaceDecl(Sema &S, ObjCInterfaceDecl *Decl,
199 SourceLocation Loc,
200 Sema::ObjCLiteralKind LiteralKind) {
201 if (!Decl) {
202 NSAPI::NSClassIdKindKind Kind = ClassKindFromLiteralKind(LiteralKind);
203 IdentifierInfo *II = S.NSAPIObj->getNSClassId(Kind);
204 S.Diag(Loc, diag::err_undeclared_objc_literal_class)
205 << II->getName() << LiteralKind;
206 return false;
207 } else if (!Decl->hasDefinition() && !S.getLangOpts().DebuggerObjCLiteral) {
208 S.Diag(Loc, diag::err_undeclared_objc_literal_class)
209 << Decl->getName() << LiteralKind;
210 S.Diag(Decl->getLocation(), diag::note_forward_class);
211 return false;
212 }
213
214 return true;
215 }
216
217 /// \brief Looks up ObjCInterfaceDecl of a given NSClassIdKindKind.
218 /// Used to create ObjC literals, such as NSDictionary (@{}),
219 /// NSArray (@[]) and Boxed Expressions (@())
LookupObjCInterfaceDeclForLiteral(Sema & S,SourceLocation Loc,Sema::ObjCLiteralKind LiteralKind)220 static ObjCInterfaceDecl *LookupObjCInterfaceDeclForLiteral(Sema &S,
221 SourceLocation Loc,
222 Sema::ObjCLiteralKind LiteralKind) {
223 NSAPI::NSClassIdKindKind ClassKind = ClassKindFromLiteralKind(LiteralKind);
224 IdentifierInfo *II = S.NSAPIObj->getNSClassId(ClassKind);
225 NamedDecl *IF = S.LookupSingleName(S.TUScope, II, Loc,
226 Sema::LookupOrdinaryName);
227 ObjCInterfaceDecl *ID = dyn_cast_or_null<ObjCInterfaceDecl>(IF);
228 if (!ID && S.getLangOpts().DebuggerObjCLiteral) {
229 ASTContext &Context = S.Context;
230 TranslationUnitDecl *TU = Context.getTranslationUnitDecl();
231 ID = ObjCInterfaceDecl::Create (Context, TU, SourceLocation(), II,
232 nullptr, nullptr, SourceLocation());
233 }
234
235 if (!ValidateObjCLiteralInterfaceDecl(S, ID, Loc, LiteralKind)) {
236 ID = nullptr;
237 }
238
239 return ID;
240 }
241
242 /// \brief Retrieve the NSNumber factory method that should be used to create
243 /// an Objective-C literal for the given type.
getNSNumberFactoryMethod(Sema & S,SourceLocation Loc,QualType NumberType,bool isLiteral=false,SourceRange R=SourceRange ())244 static ObjCMethodDecl *getNSNumberFactoryMethod(Sema &S, SourceLocation Loc,
245 QualType NumberType,
246 bool isLiteral = false,
247 SourceRange R = SourceRange()) {
248 Optional<NSAPI::NSNumberLiteralMethodKind> Kind =
249 S.NSAPIObj->getNSNumberFactoryMethodKind(NumberType);
250
251 if (!Kind) {
252 if (isLiteral) {
253 S.Diag(Loc, diag::err_invalid_nsnumber_type)
254 << NumberType << R;
255 }
256 return nullptr;
257 }
258
259 // If we already looked up this method, we're done.
260 if (S.NSNumberLiteralMethods[*Kind])
261 return S.NSNumberLiteralMethods[*Kind];
262
263 Selector Sel = S.NSAPIObj->getNSNumberLiteralSelector(*Kind,
264 /*Instance=*/false);
265
266 ASTContext &CX = S.Context;
267
268 // Look up the NSNumber class, if we haven't done so already. It's cached
269 // in the Sema instance.
270 if (!S.NSNumberDecl) {
271 S.NSNumberDecl = LookupObjCInterfaceDeclForLiteral(S, Loc,
272 Sema::LK_Numeric);
273 if (!S.NSNumberDecl) {
274 return nullptr;
275 }
276 }
277
278 if (S.NSNumberPointer.isNull()) {
279 // generate the pointer to NSNumber type.
280 QualType NSNumberObject = CX.getObjCInterfaceType(S.NSNumberDecl);
281 S.NSNumberPointer = CX.getObjCObjectPointerType(NSNumberObject);
282 }
283
284 // Look for the appropriate method within NSNumber.
285 ObjCMethodDecl *Method = S.NSNumberDecl->lookupClassMethod(Sel);
286 if (!Method && S.getLangOpts().DebuggerObjCLiteral) {
287 // create a stub definition this NSNumber factory method.
288 TypeSourceInfo *ReturnTInfo = nullptr;
289 Method =
290 ObjCMethodDecl::Create(CX, SourceLocation(), SourceLocation(), Sel,
291 S.NSNumberPointer, ReturnTInfo, S.NSNumberDecl,
292 /*isInstance=*/false, /*isVariadic=*/false,
293 /*isPropertyAccessor=*/false,
294 /*isImplicitlyDeclared=*/true,
295 /*isDefined=*/false, ObjCMethodDecl::Required,
296 /*HasRelatedResultType=*/false);
297 ParmVarDecl *value = ParmVarDecl::Create(S.Context, Method,
298 SourceLocation(), SourceLocation(),
299 &CX.Idents.get("value"),
300 NumberType, /*TInfo=*/nullptr,
301 SC_None, nullptr);
302 Method->setMethodParams(S.Context, value, None);
303 }
304
305 if (!validateBoxingMethod(S, Loc, S.NSNumberDecl, Sel, Method))
306 return nullptr;
307
308 // Note: if the parameter type is out-of-line, we'll catch it later in the
309 // implicit conversion.
310
311 S.NSNumberLiteralMethods[*Kind] = Method;
312 return Method;
313 }
314
315 /// BuildObjCNumericLiteral - builds an ObjCBoxedExpr AST node for the
316 /// numeric literal expression. Type of the expression will be "NSNumber *".
BuildObjCNumericLiteral(SourceLocation AtLoc,Expr * Number)317 ExprResult Sema::BuildObjCNumericLiteral(SourceLocation AtLoc, Expr *Number) {
318 // Determine the type of the literal.
319 QualType NumberType = Number->getType();
320 if (CharacterLiteral *Char = dyn_cast<CharacterLiteral>(Number)) {
321 // In C, character literals have type 'int'. That's not the type we want
322 // to use to determine the Objective-c literal kind.
323 switch (Char->getKind()) {
324 case CharacterLiteral::Ascii:
325 NumberType = Context.CharTy;
326 break;
327
328 case CharacterLiteral::Wide:
329 NumberType = Context.getWideCharType();
330 break;
331
332 case CharacterLiteral::UTF16:
333 NumberType = Context.Char16Ty;
334 break;
335
336 case CharacterLiteral::UTF32:
337 NumberType = Context.Char32Ty;
338 break;
339 }
340 }
341
342 // Look for the appropriate method within NSNumber.
343 // Construct the literal.
344 SourceRange NR(Number->getSourceRange());
345 ObjCMethodDecl *Method = getNSNumberFactoryMethod(*this, AtLoc, NumberType,
346 true, NR);
347 if (!Method)
348 return ExprError();
349
350 // Convert the number to the type that the parameter expects.
351 ParmVarDecl *ParamDecl = Method->parameters()[0];
352 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
353 ParamDecl);
354 ExprResult ConvertedNumber = PerformCopyInitialization(Entity,
355 SourceLocation(),
356 Number);
357 if (ConvertedNumber.isInvalid())
358 return ExprError();
359 Number = ConvertedNumber.get();
360
361 // Use the effective source range of the literal, including the leading '@'.
362 return MaybeBindToTemporary(
363 new (Context) ObjCBoxedExpr(Number, NSNumberPointer, Method,
364 SourceRange(AtLoc, NR.getEnd())));
365 }
366
ActOnObjCBoolLiteral(SourceLocation AtLoc,SourceLocation ValueLoc,bool Value)367 ExprResult Sema::ActOnObjCBoolLiteral(SourceLocation AtLoc,
368 SourceLocation ValueLoc,
369 bool Value) {
370 ExprResult Inner;
371 if (getLangOpts().CPlusPlus) {
372 Inner = ActOnCXXBoolLiteral(ValueLoc, Value? tok::kw_true : tok::kw_false);
373 } else {
374 // C doesn't actually have a way to represent literal values of type
375 // _Bool. So, we'll use 0/1 and implicit cast to _Bool.
376 Inner = ActOnIntegerConstant(ValueLoc, Value? 1 : 0);
377 Inner = ImpCastExprToType(Inner.get(), Context.BoolTy,
378 CK_IntegralToBoolean);
379 }
380
381 return BuildObjCNumericLiteral(AtLoc, Inner.get());
382 }
383
384 /// \brief Check that the given expression is a valid element of an Objective-C
385 /// collection literal.
CheckObjCCollectionLiteralElement(Sema & S,Expr * Element,QualType T,bool ArrayLiteral=false)386 static ExprResult CheckObjCCollectionLiteralElement(Sema &S, Expr *Element,
387 QualType T,
388 bool ArrayLiteral = false) {
389 // If the expression is type-dependent, there's nothing for us to do.
390 if (Element->isTypeDependent())
391 return Element;
392
393 ExprResult Result = S.CheckPlaceholderExpr(Element);
394 if (Result.isInvalid())
395 return ExprError();
396 Element = Result.get();
397
398 // In C++, check for an implicit conversion to an Objective-C object pointer
399 // type.
400 if (S.getLangOpts().CPlusPlus && Element->getType()->isRecordType()) {
401 InitializedEntity Entity
402 = InitializedEntity::InitializeParameter(S.Context, T,
403 /*Consumed=*/false);
404 InitializationKind Kind
405 = InitializationKind::CreateCopy(Element->getLocStart(),
406 SourceLocation());
407 InitializationSequence Seq(S, Entity, Kind, Element);
408 if (!Seq.Failed())
409 return Seq.Perform(S, Entity, Kind, Element);
410 }
411
412 Expr *OrigElement = Element;
413
414 // Perform lvalue-to-rvalue conversion.
415 Result = S.DefaultLvalueConversion(Element);
416 if (Result.isInvalid())
417 return ExprError();
418 Element = Result.get();
419
420 // Make sure that we have an Objective-C pointer type or block.
421 if (!Element->getType()->isObjCObjectPointerType() &&
422 !Element->getType()->isBlockPointerType()) {
423 bool Recovered = false;
424
425 // If this is potentially an Objective-C numeric literal, add the '@'.
426 if (isa<IntegerLiteral>(OrigElement) ||
427 isa<CharacterLiteral>(OrigElement) ||
428 isa<FloatingLiteral>(OrigElement) ||
429 isa<ObjCBoolLiteralExpr>(OrigElement) ||
430 isa<CXXBoolLiteralExpr>(OrigElement)) {
431 if (S.NSAPIObj->getNSNumberFactoryMethodKind(OrigElement->getType())) {
432 int Which = isa<CharacterLiteral>(OrigElement) ? 1
433 : (isa<CXXBoolLiteralExpr>(OrigElement) ||
434 isa<ObjCBoolLiteralExpr>(OrigElement)) ? 2
435 : 3;
436
437 S.Diag(OrigElement->getLocStart(), diag::err_box_literal_collection)
438 << Which << OrigElement->getSourceRange()
439 << FixItHint::CreateInsertion(OrigElement->getLocStart(), "@");
440
441 Result = S.BuildObjCNumericLiteral(OrigElement->getLocStart(),
442 OrigElement);
443 if (Result.isInvalid())
444 return ExprError();
445
446 Element = Result.get();
447 Recovered = true;
448 }
449 }
450 // If this is potentially an Objective-C string literal, add the '@'.
451 else if (StringLiteral *String = dyn_cast<StringLiteral>(OrigElement)) {
452 if (String->isAscii()) {
453 S.Diag(OrigElement->getLocStart(), diag::err_box_literal_collection)
454 << 0 << OrigElement->getSourceRange()
455 << FixItHint::CreateInsertion(OrigElement->getLocStart(), "@");
456
457 Result = S.BuildObjCStringLiteral(OrigElement->getLocStart(), String);
458 if (Result.isInvalid())
459 return ExprError();
460
461 Element = Result.get();
462 Recovered = true;
463 }
464 }
465
466 if (!Recovered) {
467 S.Diag(Element->getLocStart(), diag::err_invalid_collection_element)
468 << Element->getType();
469 return ExprError();
470 }
471 }
472 if (ArrayLiteral)
473 if (ObjCStringLiteral *getString =
474 dyn_cast<ObjCStringLiteral>(OrigElement)) {
475 if (StringLiteral *SL = getString->getString()) {
476 unsigned numConcat = SL->getNumConcatenated();
477 if (numConcat > 1) {
478 // Only warn if the concatenated string doesn't come from a macro.
479 bool hasMacro = false;
480 for (unsigned i = 0; i < numConcat ; ++i)
481 if (SL->getStrTokenLoc(i).isMacroID()) {
482 hasMacro = true;
483 break;
484 }
485 if (!hasMacro)
486 S.Diag(Element->getLocStart(),
487 diag::warn_concatenated_nsarray_literal)
488 << Element->getType();
489 }
490 }
491 }
492
493 // Make sure that the element has the type that the container factory
494 // function expects.
495 return S.PerformCopyInitialization(
496 InitializedEntity::InitializeParameter(S.Context, T,
497 /*Consumed=*/false),
498 Element->getLocStart(), Element);
499 }
500
BuildObjCBoxedExpr(SourceRange SR,Expr * ValueExpr)501 ExprResult Sema::BuildObjCBoxedExpr(SourceRange SR, Expr *ValueExpr) {
502 if (ValueExpr->isTypeDependent()) {
503 ObjCBoxedExpr *BoxedExpr =
504 new (Context) ObjCBoxedExpr(ValueExpr, Context.DependentTy, nullptr, SR);
505 return BoxedExpr;
506 }
507 ObjCMethodDecl *BoxingMethod = nullptr;
508 QualType BoxedType;
509 // Convert the expression to an RValue, so we can check for pointer types...
510 ExprResult RValue = DefaultFunctionArrayLvalueConversion(ValueExpr);
511 if (RValue.isInvalid()) {
512 return ExprError();
513 }
514 SourceLocation Loc = SR.getBegin();
515 ValueExpr = RValue.get();
516 QualType ValueType(ValueExpr->getType());
517 if (const PointerType *PT = ValueType->getAs<PointerType>()) {
518 QualType PointeeType = PT->getPointeeType();
519 if (Context.hasSameUnqualifiedType(PointeeType, Context.CharTy)) {
520
521 if (!NSStringDecl) {
522 NSStringDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
523 Sema::LK_String);
524 if (!NSStringDecl) {
525 return ExprError();
526 }
527 QualType NSStringObject = Context.getObjCInterfaceType(NSStringDecl);
528 NSStringPointer = Context.getObjCObjectPointerType(NSStringObject);
529 }
530
531 if (!StringWithUTF8StringMethod) {
532 IdentifierInfo *II = &Context.Idents.get("stringWithUTF8String");
533 Selector stringWithUTF8String = Context.Selectors.getUnarySelector(II);
534
535 // Look for the appropriate method within NSString.
536 BoxingMethod = NSStringDecl->lookupClassMethod(stringWithUTF8String);
537 if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) {
538 // Debugger needs to work even if NSString hasn't been defined.
539 TypeSourceInfo *ReturnTInfo = nullptr;
540 ObjCMethodDecl *M = ObjCMethodDecl::Create(
541 Context, SourceLocation(), SourceLocation(), stringWithUTF8String,
542 NSStringPointer, ReturnTInfo, NSStringDecl,
543 /*isInstance=*/false, /*isVariadic=*/false,
544 /*isPropertyAccessor=*/false,
545 /*isImplicitlyDeclared=*/true,
546 /*isDefined=*/false, ObjCMethodDecl::Required,
547 /*HasRelatedResultType=*/false);
548 QualType ConstCharType = Context.CharTy.withConst();
549 ParmVarDecl *value =
550 ParmVarDecl::Create(Context, M,
551 SourceLocation(), SourceLocation(),
552 &Context.Idents.get("value"),
553 Context.getPointerType(ConstCharType),
554 /*TInfo=*/nullptr,
555 SC_None, nullptr);
556 M->setMethodParams(Context, value, None);
557 BoxingMethod = M;
558 }
559
560 if (!validateBoxingMethod(*this, Loc, NSStringDecl,
561 stringWithUTF8String, BoxingMethod))
562 return ExprError();
563
564 StringWithUTF8StringMethod = BoxingMethod;
565 }
566
567 BoxingMethod = StringWithUTF8StringMethod;
568 BoxedType = NSStringPointer;
569 }
570 } else if (ValueType->isBuiltinType()) {
571 // The other types we support are numeric, char and BOOL/bool. We could also
572 // provide limited support for structure types, such as NSRange, NSRect, and
573 // NSSize. See NSValue (NSValueGeometryExtensions) in <Foundation/NSGeometry.h>
574 // for more details.
575
576 // Check for a top-level character literal.
577 if (const CharacterLiteral *Char =
578 dyn_cast<CharacterLiteral>(ValueExpr->IgnoreParens())) {
579 // In C, character literals have type 'int'. That's not the type we want
580 // to use to determine the Objective-c literal kind.
581 switch (Char->getKind()) {
582 case CharacterLiteral::Ascii:
583 ValueType = Context.CharTy;
584 break;
585
586 case CharacterLiteral::Wide:
587 ValueType = Context.getWideCharType();
588 break;
589
590 case CharacterLiteral::UTF16:
591 ValueType = Context.Char16Ty;
592 break;
593
594 case CharacterLiteral::UTF32:
595 ValueType = Context.Char32Ty;
596 break;
597 }
598 }
599 CheckForIntOverflow(ValueExpr);
600 // FIXME: Do I need to do anything special with BoolTy expressions?
601
602 // Look for the appropriate method within NSNumber.
603 BoxingMethod = getNSNumberFactoryMethod(*this, Loc, ValueType);
604 BoxedType = NSNumberPointer;
605 } else if (const EnumType *ET = ValueType->getAs<EnumType>()) {
606 if (!ET->getDecl()->isComplete()) {
607 Diag(Loc, diag::err_objc_incomplete_boxed_expression_type)
608 << ValueType << ValueExpr->getSourceRange();
609 return ExprError();
610 }
611
612 BoxingMethod = getNSNumberFactoryMethod(*this, Loc,
613 ET->getDecl()->getIntegerType());
614 BoxedType = NSNumberPointer;
615 } else if (ValueType->isObjCBoxableRecordType()) {
616 // Support for structure types, that marked as objc_boxable
617 // struct __attribute__((objc_boxable)) s { ... };
618
619 // Look up the NSValue class, if we haven't done so already. It's cached
620 // in the Sema instance.
621 if (!NSValueDecl) {
622 NSValueDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
623 Sema::LK_Boxed);
624 if (!NSValueDecl) {
625 return ExprError();
626 }
627
628 // generate the pointer to NSValue type.
629 QualType NSValueObject = Context.getObjCInterfaceType(NSValueDecl);
630 NSValuePointer = Context.getObjCObjectPointerType(NSValueObject);
631 }
632
633 if (!ValueWithBytesObjCTypeMethod) {
634 IdentifierInfo *II[] = {
635 &Context.Idents.get("valueWithBytes"),
636 &Context.Idents.get("objCType")
637 };
638 Selector ValueWithBytesObjCType = Context.Selectors.getSelector(2, II);
639
640 // Look for the appropriate method within NSValue.
641 BoxingMethod = NSValueDecl->lookupClassMethod(ValueWithBytesObjCType);
642 if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) {
643 // Debugger needs to work even if NSValue hasn't been defined.
644 TypeSourceInfo *ReturnTInfo = nullptr;
645 ObjCMethodDecl *M = ObjCMethodDecl::Create(
646 Context,
647 SourceLocation(),
648 SourceLocation(),
649 ValueWithBytesObjCType,
650 NSValuePointer,
651 ReturnTInfo,
652 NSValueDecl,
653 /*isInstance=*/false,
654 /*isVariadic=*/false,
655 /*isPropertyAccessor=*/false,
656 /*isImplicitlyDeclared=*/true,
657 /*isDefined=*/false,
658 ObjCMethodDecl::Required,
659 /*HasRelatedResultType=*/false);
660
661 SmallVector<ParmVarDecl *, 2> Params;
662
663 ParmVarDecl *bytes =
664 ParmVarDecl::Create(Context, M,
665 SourceLocation(), SourceLocation(),
666 &Context.Idents.get("bytes"),
667 Context.VoidPtrTy.withConst(),
668 /*TInfo=*/nullptr,
669 SC_None, nullptr);
670 Params.push_back(bytes);
671
672 QualType ConstCharType = Context.CharTy.withConst();
673 ParmVarDecl *type =
674 ParmVarDecl::Create(Context, M,
675 SourceLocation(), SourceLocation(),
676 &Context.Idents.get("type"),
677 Context.getPointerType(ConstCharType),
678 /*TInfo=*/nullptr,
679 SC_None, nullptr);
680 Params.push_back(type);
681
682 M->setMethodParams(Context, Params, None);
683 BoxingMethod = M;
684 }
685
686 if (!validateBoxingMethod(*this, Loc, NSValueDecl,
687 ValueWithBytesObjCType, BoxingMethod))
688 return ExprError();
689
690 ValueWithBytesObjCTypeMethod = BoxingMethod;
691 }
692
693 if (!ValueType.isTriviallyCopyableType(Context)) {
694 Diag(Loc, diag::err_objc_non_trivially_copyable_boxed_expression_type)
695 << ValueType << ValueExpr->getSourceRange();
696 return ExprError();
697 }
698
699 BoxingMethod = ValueWithBytesObjCTypeMethod;
700 BoxedType = NSValuePointer;
701 }
702
703 if (!BoxingMethod) {
704 Diag(Loc, diag::err_objc_illegal_boxed_expression_type)
705 << ValueType << ValueExpr->getSourceRange();
706 return ExprError();
707 }
708
709 DiagnoseUseOfDecl(BoxingMethod, Loc);
710
711 ExprResult ConvertedValueExpr;
712 if (ValueType->isObjCBoxableRecordType()) {
713 InitializedEntity IE = InitializedEntity::InitializeTemporary(ValueType);
714 ConvertedValueExpr = PerformCopyInitialization(IE, ValueExpr->getExprLoc(),
715 ValueExpr);
716 } else {
717 // Convert the expression to the type that the parameter requires.
718 ParmVarDecl *ParamDecl = BoxingMethod->parameters()[0];
719 InitializedEntity IE = InitializedEntity::InitializeParameter(Context,
720 ParamDecl);
721 ConvertedValueExpr = PerformCopyInitialization(IE, SourceLocation(),
722 ValueExpr);
723 }
724
725 if (ConvertedValueExpr.isInvalid())
726 return ExprError();
727 ValueExpr = ConvertedValueExpr.get();
728
729 ObjCBoxedExpr *BoxedExpr =
730 new (Context) ObjCBoxedExpr(ValueExpr, BoxedType,
731 BoxingMethod, SR);
732 return MaybeBindToTemporary(BoxedExpr);
733 }
734
735 /// Build an ObjC subscript pseudo-object expression, given that
736 /// that's supported by the runtime.
BuildObjCSubscriptExpression(SourceLocation RB,Expr * BaseExpr,Expr * IndexExpr,ObjCMethodDecl * getterMethod,ObjCMethodDecl * setterMethod)737 ExprResult Sema::BuildObjCSubscriptExpression(SourceLocation RB, Expr *BaseExpr,
738 Expr *IndexExpr,
739 ObjCMethodDecl *getterMethod,
740 ObjCMethodDecl *setterMethod) {
741 assert(!LangOpts.isSubscriptPointerArithmetic());
742
743 // We can't get dependent types here; our callers should have
744 // filtered them out.
745 assert((!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) &&
746 "base or index cannot have dependent type here");
747
748 // Filter out placeholders in the index. In theory, overloads could
749 // be preserved here, although that might not actually work correctly.
750 ExprResult Result = CheckPlaceholderExpr(IndexExpr);
751 if (Result.isInvalid())
752 return ExprError();
753 IndexExpr = Result.get();
754
755 // Perform lvalue-to-rvalue conversion on the base.
756 Result = DefaultLvalueConversion(BaseExpr);
757 if (Result.isInvalid())
758 return ExprError();
759 BaseExpr = Result.get();
760
761 // Build the pseudo-object expression.
762 return ObjCSubscriptRefExpr::Create(Context, BaseExpr, IndexExpr,
763 Context.PseudoObjectTy, getterMethod,
764 setterMethod, RB);
765 }
766
BuildObjCArrayLiteral(SourceRange SR,MultiExprArg Elements)767 ExprResult Sema::BuildObjCArrayLiteral(SourceRange SR, MultiExprArg Elements) {
768 SourceLocation Loc = SR.getBegin();
769
770 if (!NSArrayDecl) {
771 NSArrayDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
772 Sema::LK_Array);
773 if (!NSArrayDecl) {
774 return ExprError();
775 }
776 }
777
778 // Find the arrayWithObjects:count: method, if we haven't done so already.
779 QualType IdT = Context.getObjCIdType();
780 if (!ArrayWithObjectsMethod) {
781 Selector
782 Sel = NSAPIObj->getNSArraySelector(NSAPI::NSArr_arrayWithObjectsCount);
783 ObjCMethodDecl *Method = NSArrayDecl->lookupClassMethod(Sel);
784 if (!Method && getLangOpts().DebuggerObjCLiteral) {
785 TypeSourceInfo *ReturnTInfo = nullptr;
786 Method = ObjCMethodDecl::Create(
787 Context, SourceLocation(), SourceLocation(), Sel, IdT, ReturnTInfo,
788 Context.getTranslationUnitDecl(), false /*Instance*/,
789 false /*isVariadic*/,
790 /*isPropertyAccessor=*/false,
791 /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
792 ObjCMethodDecl::Required, false);
793 SmallVector<ParmVarDecl *, 2> Params;
794 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
795 SourceLocation(),
796 SourceLocation(),
797 &Context.Idents.get("objects"),
798 Context.getPointerType(IdT),
799 /*TInfo=*/nullptr,
800 SC_None, nullptr);
801 Params.push_back(objects);
802 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
803 SourceLocation(),
804 SourceLocation(),
805 &Context.Idents.get("cnt"),
806 Context.UnsignedLongTy,
807 /*TInfo=*/nullptr, SC_None,
808 nullptr);
809 Params.push_back(cnt);
810 Method->setMethodParams(Context, Params, None);
811 }
812
813 if (!validateBoxingMethod(*this, Loc, NSArrayDecl, Sel, Method))
814 return ExprError();
815
816 // Dig out the type that all elements should be converted to.
817 QualType T = Method->parameters()[0]->getType();
818 const PointerType *PtrT = T->getAs<PointerType>();
819 if (!PtrT ||
820 !Context.hasSameUnqualifiedType(PtrT->getPointeeType(), IdT)) {
821 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
822 << Sel;
823 Diag(Method->parameters()[0]->getLocation(),
824 diag::note_objc_literal_method_param)
825 << 0 << T
826 << Context.getPointerType(IdT.withConst());
827 return ExprError();
828 }
829
830 // Check that the 'count' parameter is integral.
831 if (!Method->parameters()[1]->getType()->isIntegerType()) {
832 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
833 << Sel;
834 Diag(Method->parameters()[1]->getLocation(),
835 diag::note_objc_literal_method_param)
836 << 1
837 << Method->parameters()[1]->getType()
838 << "integral";
839 return ExprError();
840 }
841
842 // We've found a good +arrayWithObjects:count: method. Save it!
843 ArrayWithObjectsMethod = Method;
844 }
845
846 QualType ObjectsType = ArrayWithObjectsMethod->parameters()[0]->getType();
847 QualType RequiredType = ObjectsType->castAs<PointerType>()->getPointeeType();
848
849 // Check that each of the elements provided is valid in a collection literal,
850 // performing conversions as necessary.
851 Expr **ElementsBuffer = Elements.data();
852 for (unsigned I = 0, N = Elements.size(); I != N; ++I) {
853 ExprResult Converted = CheckObjCCollectionLiteralElement(*this,
854 ElementsBuffer[I],
855 RequiredType, true);
856 if (Converted.isInvalid())
857 return ExprError();
858
859 ElementsBuffer[I] = Converted.get();
860 }
861
862 QualType Ty
863 = Context.getObjCObjectPointerType(
864 Context.getObjCInterfaceType(NSArrayDecl));
865
866 return MaybeBindToTemporary(
867 ObjCArrayLiteral::Create(Context, Elements, Ty,
868 ArrayWithObjectsMethod, SR));
869 }
870
BuildObjCDictionaryLiteral(SourceRange SR,ObjCDictionaryElement * Elements,unsigned NumElements)871 ExprResult Sema::BuildObjCDictionaryLiteral(SourceRange SR,
872 ObjCDictionaryElement *Elements,
873 unsigned NumElements) {
874 SourceLocation Loc = SR.getBegin();
875
876 if (!NSDictionaryDecl) {
877 NSDictionaryDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
878 Sema::LK_Dictionary);
879 if (!NSDictionaryDecl) {
880 return ExprError();
881 }
882 }
883
884 // Find the dictionaryWithObjects:forKeys:count: method, if we haven't done
885 // so already.
886 QualType IdT = Context.getObjCIdType();
887 if (!DictionaryWithObjectsMethod) {
888 Selector Sel = NSAPIObj->getNSDictionarySelector(
889 NSAPI::NSDict_dictionaryWithObjectsForKeysCount);
890 ObjCMethodDecl *Method = NSDictionaryDecl->lookupClassMethod(Sel);
891 if (!Method && getLangOpts().DebuggerObjCLiteral) {
892 Method = ObjCMethodDecl::Create(Context,
893 SourceLocation(), SourceLocation(), Sel,
894 IdT,
895 nullptr /*TypeSourceInfo */,
896 Context.getTranslationUnitDecl(),
897 false /*Instance*/, false/*isVariadic*/,
898 /*isPropertyAccessor=*/false,
899 /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
900 ObjCMethodDecl::Required,
901 false);
902 SmallVector<ParmVarDecl *, 3> Params;
903 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
904 SourceLocation(),
905 SourceLocation(),
906 &Context.Idents.get("objects"),
907 Context.getPointerType(IdT),
908 /*TInfo=*/nullptr, SC_None,
909 nullptr);
910 Params.push_back(objects);
911 ParmVarDecl *keys = ParmVarDecl::Create(Context, Method,
912 SourceLocation(),
913 SourceLocation(),
914 &Context.Idents.get("keys"),
915 Context.getPointerType(IdT),
916 /*TInfo=*/nullptr, SC_None,
917 nullptr);
918 Params.push_back(keys);
919 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
920 SourceLocation(),
921 SourceLocation(),
922 &Context.Idents.get("cnt"),
923 Context.UnsignedLongTy,
924 /*TInfo=*/nullptr, SC_None,
925 nullptr);
926 Params.push_back(cnt);
927 Method->setMethodParams(Context, Params, None);
928 }
929
930 if (!validateBoxingMethod(*this, SR.getBegin(), NSDictionaryDecl, Sel,
931 Method))
932 return ExprError();
933
934 // Dig out the type that all values should be converted to.
935 QualType ValueT = Method->parameters()[0]->getType();
936 const PointerType *PtrValue = ValueT->getAs<PointerType>();
937 if (!PtrValue ||
938 !Context.hasSameUnqualifiedType(PtrValue->getPointeeType(), IdT)) {
939 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
940 << Sel;
941 Diag(Method->parameters()[0]->getLocation(),
942 diag::note_objc_literal_method_param)
943 << 0 << ValueT
944 << Context.getPointerType(IdT.withConst());
945 return ExprError();
946 }
947
948 // Dig out the type that all keys should be converted to.
949 QualType KeyT = Method->parameters()[1]->getType();
950 const PointerType *PtrKey = KeyT->getAs<PointerType>();
951 if (!PtrKey ||
952 !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
953 IdT)) {
954 bool err = true;
955 if (PtrKey) {
956 if (QIDNSCopying.isNull()) {
957 // key argument of selector is id<NSCopying>?
958 if (ObjCProtocolDecl *NSCopyingPDecl =
959 LookupProtocol(&Context.Idents.get("NSCopying"), SR.getBegin())) {
960 ObjCProtocolDecl *PQ[] = {NSCopyingPDecl};
961 QIDNSCopying =
962 Context.getObjCObjectType(Context.ObjCBuiltinIdTy, { },
963 llvm::makeArrayRef(
964 (ObjCProtocolDecl**) PQ,
965 1),
966 false);
967 QIDNSCopying = Context.getObjCObjectPointerType(QIDNSCopying);
968 }
969 }
970 if (!QIDNSCopying.isNull())
971 err = !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
972 QIDNSCopying);
973 }
974
975 if (err) {
976 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
977 << Sel;
978 Diag(Method->parameters()[1]->getLocation(),
979 diag::note_objc_literal_method_param)
980 << 1 << KeyT
981 << Context.getPointerType(IdT.withConst());
982 return ExprError();
983 }
984 }
985
986 // Check that the 'count' parameter is integral.
987 QualType CountType = Method->parameters()[2]->getType();
988 if (!CountType->isIntegerType()) {
989 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
990 << Sel;
991 Diag(Method->parameters()[2]->getLocation(),
992 diag::note_objc_literal_method_param)
993 << 2 << CountType
994 << "integral";
995 return ExprError();
996 }
997
998 // We've found a good +dictionaryWithObjects:keys:count: method; save it!
999 DictionaryWithObjectsMethod = Method;
1000 }
1001
1002 QualType ValuesT = DictionaryWithObjectsMethod->parameters()[0]->getType();
1003 QualType ValueT = ValuesT->castAs<PointerType>()->getPointeeType();
1004 QualType KeysT = DictionaryWithObjectsMethod->parameters()[1]->getType();
1005 QualType KeyT = KeysT->castAs<PointerType>()->getPointeeType();
1006
1007 // Check that each of the keys and values provided is valid in a collection
1008 // literal, performing conversions as necessary.
1009 bool HasPackExpansions = false;
1010 for (unsigned I = 0, N = NumElements; I != N; ++I) {
1011 // Check the key.
1012 ExprResult Key = CheckObjCCollectionLiteralElement(*this, Elements[I].Key,
1013 KeyT);
1014 if (Key.isInvalid())
1015 return ExprError();
1016
1017 // Check the value.
1018 ExprResult Value
1019 = CheckObjCCollectionLiteralElement(*this, Elements[I].Value, ValueT);
1020 if (Value.isInvalid())
1021 return ExprError();
1022
1023 Elements[I].Key = Key.get();
1024 Elements[I].Value = Value.get();
1025
1026 if (Elements[I].EllipsisLoc.isInvalid())
1027 continue;
1028
1029 if (!Elements[I].Key->containsUnexpandedParameterPack() &&
1030 !Elements[I].Value->containsUnexpandedParameterPack()) {
1031 Diag(Elements[I].EllipsisLoc,
1032 diag::err_pack_expansion_without_parameter_packs)
1033 << SourceRange(Elements[I].Key->getLocStart(),
1034 Elements[I].Value->getLocEnd());
1035 return ExprError();
1036 }
1037
1038 HasPackExpansions = true;
1039 }
1040
1041
1042 QualType Ty
1043 = Context.getObjCObjectPointerType(
1044 Context.getObjCInterfaceType(NSDictionaryDecl));
1045 return MaybeBindToTemporary(ObjCDictionaryLiteral::Create(
1046 Context, makeArrayRef(Elements, NumElements), HasPackExpansions, Ty,
1047 DictionaryWithObjectsMethod, SR));
1048 }
1049
BuildObjCEncodeExpression(SourceLocation AtLoc,TypeSourceInfo * EncodedTypeInfo,SourceLocation RParenLoc)1050 ExprResult Sema::BuildObjCEncodeExpression(SourceLocation AtLoc,
1051 TypeSourceInfo *EncodedTypeInfo,
1052 SourceLocation RParenLoc) {
1053 QualType EncodedType = EncodedTypeInfo->getType();
1054 QualType StrTy;
1055 if (EncodedType->isDependentType())
1056 StrTy = Context.DependentTy;
1057 else {
1058 if (!EncodedType->getAsArrayTypeUnsafe() && //// Incomplete array is handled.
1059 !EncodedType->isVoidType()) // void is handled too.
1060 if (RequireCompleteType(AtLoc, EncodedType,
1061 diag::err_incomplete_type_objc_at_encode,
1062 EncodedTypeInfo->getTypeLoc()))
1063 return ExprError();
1064
1065 std::string Str;
1066 QualType NotEncodedT;
1067 Context.getObjCEncodingForType(EncodedType, Str, nullptr, &NotEncodedT);
1068 if (!NotEncodedT.isNull())
1069 Diag(AtLoc, diag::warn_incomplete_encoded_type)
1070 << EncodedType << NotEncodedT;
1071
1072 // The type of @encode is the same as the type of the corresponding string,
1073 // which is an array type.
1074 StrTy = Context.CharTy;
1075 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
1076 if (getLangOpts().CPlusPlus || getLangOpts().ConstStrings)
1077 StrTy.addConst();
1078 StrTy = Context.getConstantArrayType(StrTy, llvm::APInt(32, Str.size()+1),
1079 ArrayType::Normal, 0);
1080 }
1081
1082 return new (Context) ObjCEncodeExpr(StrTy, EncodedTypeInfo, AtLoc, RParenLoc);
1083 }
1084
ParseObjCEncodeExpression(SourceLocation AtLoc,SourceLocation EncodeLoc,SourceLocation LParenLoc,ParsedType ty,SourceLocation RParenLoc)1085 ExprResult Sema::ParseObjCEncodeExpression(SourceLocation AtLoc,
1086 SourceLocation EncodeLoc,
1087 SourceLocation LParenLoc,
1088 ParsedType ty,
1089 SourceLocation RParenLoc) {
1090 // FIXME: Preserve type source info ?
1091 TypeSourceInfo *TInfo;
1092 QualType EncodedType = GetTypeFromParser(ty, &TInfo);
1093 if (!TInfo)
1094 TInfo = Context.getTrivialTypeSourceInfo(EncodedType,
1095 getLocForEndOfToken(LParenLoc));
1096
1097 return BuildObjCEncodeExpression(AtLoc, TInfo, RParenLoc);
1098 }
1099
HelperToDiagnoseMismatchedMethodsInGlobalPool(Sema & S,SourceLocation AtLoc,SourceLocation LParenLoc,SourceLocation RParenLoc,ObjCMethodDecl * Method,ObjCMethodList & MethList)1100 static bool HelperToDiagnoseMismatchedMethodsInGlobalPool(Sema &S,
1101 SourceLocation AtLoc,
1102 SourceLocation LParenLoc,
1103 SourceLocation RParenLoc,
1104 ObjCMethodDecl *Method,
1105 ObjCMethodList &MethList) {
1106 ObjCMethodList *M = &MethList;
1107 bool Warned = false;
1108 for (M = M->getNext(); M; M=M->getNext()) {
1109 ObjCMethodDecl *MatchingMethodDecl = M->getMethod();
1110 if (MatchingMethodDecl == Method ||
1111 isa<ObjCImplDecl>(MatchingMethodDecl->getDeclContext()) ||
1112 MatchingMethodDecl->getSelector() != Method->getSelector())
1113 continue;
1114 if (!S.MatchTwoMethodDeclarations(Method,
1115 MatchingMethodDecl, Sema::MMS_loose)) {
1116 if (!Warned) {
1117 Warned = true;
1118 S.Diag(AtLoc, diag::warning_multiple_selectors)
1119 << Method->getSelector() << FixItHint::CreateInsertion(LParenLoc, "(")
1120 << FixItHint::CreateInsertion(RParenLoc, ")");
1121 S.Diag(Method->getLocation(), diag::note_method_declared_at)
1122 << Method->getDeclName();
1123 }
1124 S.Diag(MatchingMethodDecl->getLocation(), diag::note_method_declared_at)
1125 << MatchingMethodDecl->getDeclName();
1126 }
1127 }
1128 return Warned;
1129 }
1130
DiagnoseMismatchedSelectors(Sema & S,SourceLocation AtLoc,ObjCMethodDecl * Method,SourceLocation LParenLoc,SourceLocation RParenLoc,bool WarnMultipleSelectors)1131 static void DiagnoseMismatchedSelectors(Sema &S, SourceLocation AtLoc,
1132 ObjCMethodDecl *Method,
1133 SourceLocation LParenLoc,
1134 SourceLocation RParenLoc,
1135 bool WarnMultipleSelectors) {
1136 if (!WarnMultipleSelectors ||
1137 S.Diags.isIgnored(diag::warning_multiple_selectors, SourceLocation()))
1138 return;
1139 bool Warned = false;
1140 for (Sema::GlobalMethodPool::iterator b = S.MethodPool.begin(),
1141 e = S.MethodPool.end(); b != e; b++) {
1142 // first, instance methods
1143 ObjCMethodList &InstMethList = b->second.first;
1144 if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc,
1145 Method, InstMethList))
1146 Warned = true;
1147
1148 // second, class methods
1149 ObjCMethodList &ClsMethList = b->second.second;
1150 if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc,
1151 Method, ClsMethList) || Warned)
1152 return;
1153 }
1154 }
1155
ParseObjCSelectorExpression(Selector Sel,SourceLocation AtLoc,SourceLocation SelLoc,SourceLocation LParenLoc,SourceLocation RParenLoc,bool WarnMultipleSelectors)1156 ExprResult Sema::ParseObjCSelectorExpression(Selector Sel,
1157 SourceLocation AtLoc,
1158 SourceLocation SelLoc,
1159 SourceLocation LParenLoc,
1160 SourceLocation RParenLoc,
1161 bool WarnMultipleSelectors) {
1162 ObjCMethodDecl *Method = LookupInstanceMethodInGlobalPool(Sel,
1163 SourceRange(LParenLoc, RParenLoc));
1164 if (!Method)
1165 Method = LookupFactoryMethodInGlobalPool(Sel,
1166 SourceRange(LParenLoc, RParenLoc));
1167 if (!Method) {
1168 if (const ObjCMethodDecl *OM = SelectorsForTypoCorrection(Sel)) {
1169 Selector MatchedSel = OM->getSelector();
1170 SourceRange SelectorRange(LParenLoc.getLocWithOffset(1),
1171 RParenLoc.getLocWithOffset(-1));
1172 Diag(SelLoc, diag::warn_undeclared_selector_with_typo)
1173 << Sel << MatchedSel
1174 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1175
1176 } else
1177 Diag(SelLoc, diag::warn_undeclared_selector) << Sel;
1178 } else
1179 DiagnoseMismatchedSelectors(*this, AtLoc, Method, LParenLoc, RParenLoc,
1180 WarnMultipleSelectors);
1181
1182 if (Method &&
1183 Method->getImplementationControl() != ObjCMethodDecl::Optional &&
1184 !getSourceManager().isInSystemHeader(Method->getLocation()))
1185 ReferencedSelectors.insert(std::make_pair(Sel, AtLoc));
1186
1187 // In ARC, forbid the user from using @selector for
1188 // retain/release/autorelease/dealloc/retainCount.
1189 if (getLangOpts().ObjCAutoRefCount) {
1190 switch (Sel.getMethodFamily()) {
1191 case OMF_retain:
1192 case OMF_release:
1193 case OMF_autorelease:
1194 case OMF_retainCount:
1195 case OMF_dealloc:
1196 Diag(AtLoc, diag::err_arc_illegal_selector) <<
1197 Sel << SourceRange(LParenLoc, RParenLoc);
1198 break;
1199
1200 case OMF_None:
1201 case OMF_alloc:
1202 case OMF_copy:
1203 case OMF_finalize:
1204 case OMF_init:
1205 case OMF_mutableCopy:
1206 case OMF_new:
1207 case OMF_self:
1208 case OMF_initialize:
1209 case OMF_performSelector:
1210 break;
1211 }
1212 }
1213 QualType Ty = Context.getObjCSelType();
1214 return new (Context) ObjCSelectorExpr(Ty, Sel, AtLoc, RParenLoc);
1215 }
1216
ParseObjCProtocolExpression(IdentifierInfo * ProtocolId,SourceLocation AtLoc,SourceLocation ProtoLoc,SourceLocation LParenLoc,SourceLocation ProtoIdLoc,SourceLocation RParenLoc)1217 ExprResult Sema::ParseObjCProtocolExpression(IdentifierInfo *ProtocolId,
1218 SourceLocation AtLoc,
1219 SourceLocation ProtoLoc,
1220 SourceLocation LParenLoc,
1221 SourceLocation ProtoIdLoc,
1222 SourceLocation RParenLoc) {
1223 ObjCProtocolDecl* PDecl = LookupProtocol(ProtocolId, ProtoIdLoc);
1224 if (!PDecl) {
1225 Diag(ProtoLoc, diag::err_undeclared_protocol) << ProtocolId;
1226 return true;
1227 }
1228 if (PDecl->hasDefinition())
1229 PDecl = PDecl->getDefinition();
1230
1231 QualType Ty = Context.getObjCProtoType();
1232 if (Ty.isNull())
1233 return true;
1234 Ty = Context.getObjCObjectPointerType(Ty);
1235 return new (Context) ObjCProtocolExpr(Ty, PDecl, AtLoc, ProtoIdLoc, RParenLoc);
1236 }
1237
1238 /// Try to capture an implicit reference to 'self'.
tryCaptureObjCSelf(SourceLocation Loc)1239 ObjCMethodDecl *Sema::tryCaptureObjCSelf(SourceLocation Loc) {
1240 DeclContext *DC = getFunctionLevelDeclContext();
1241
1242 // If we're not in an ObjC method, error out. Note that, unlike the
1243 // C++ case, we don't require an instance method --- class methods
1244 // still have a 'self', and we really do still need to capture it!
1245 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(DC);
1246 if (!method)
1247 return nullptr;
1248
1249 tryCaptureVariable(method->getSelfDecl(), Loc);
1250
1251 return method;
1252 }
1253
stripObjCInstanceType(ASTContext & Context,QualType T)1254 static QualType stripObjCInstanceType(ASTContext &Context, QualType T) {
1255 QualType origType = T;
1256 if (auto nullability = AttributedType::stripOuterNullability(T)) {
1257 if (T == Context.getObjCInstanceType()) {
1258 return Context.getAttributedType(
1259 AttributedType::getNullabilityAttrKind(*nullability),
1260 Context.getObjCIdType(),
1261 Context.getObjCIdType());
1262 }
1263
1264 return origType;
1265 }
1266
1267 if (T == Context.getObjCInstanceType())
1268 return Context.getObjCIdType();
1269
1270 return origType;
1271 }
1272
1273 /// Determine the result type of a message send based on the receiver type,
1274 /// method, and the kind of message send.
1275 ///
1276 /// This is the "base" result type, which will still need to be adjusted
1277 /// to account for nullability.
getBaseMessageSendResultType(Sema & S,QualType ReceiverType,ObjCMethodDecl * Method,bool isClassMessage,bool isSuperMessage)1278 static QualType getBaseMessageSendResultType(Sema &S,
1279 QualType ReceiverType,
1280 ObjCMethodDecl *Method,
1281 bool isClassMessage,
1282 bool isSuperMessage) {
1283 assert(Method && "Must have a method");
1284 if (!Method->hasRelatedResultType())
1285 return Method->getSendResultType(ReceiverType);
1286
1287 ASTContext &Context = S.Context;
1288
1289 // Local function that transfers the nullability of the method's
1290 // result type to the returned result.
1291 auto transferNullability = [&](QualType type) -> QualType {
1292 // If the method's result type has nullability, extract it.
1293 if (auto nullability = Method->getSendResultType(ReceiverType)
1294 ->getNullability(Context)){
1295 // Strip off any outer nullability sugar from the provided type.
1296 (void)AttributedType::stripOuterNullability(type);
1297
1298 // Form a new attributed type using the method result type's nullability.
1299 return Context.getAttributedType(
1300 AttributedType::getNullabilityAttrKind(*nullability),
1301 type,
1302 type);
1303 }
1304
1305 return type;
1306 };
1307
1308 // If a method has a related return type:
1309 // - if the method found is an instance method, but the message send
1310 // was a class message send, T is the declared return type of the method
1311 // found
1312 if (Method->isInstanceMethod() && isClassMessage)
1313 return stripObjCInstanceType(Context,
1314 Method->getSendResultType(ReceiverType));
1315
1316 // - if the receiver is super, T is a pointer to the class of the
1317 // enclosing method definition
1318 if (isSuperMessage) {
1319 if (ObjCMethodDecl *CurMethod = S.getCurMethodDecl())
1320 if (ObjCInterfaceDecl *Class = CurMethod->getClassInterface()) {
1321 return transferNullability(
1322 Context.getObjCObjectPointerType(
1323 Context.getObjCInterfaceType(Class)));
1324 }
1325 }
1326
1327 // - if the receiver is the name of a class U, T is a pointer to U
1328 if (ReceiverType->getAsObjCInterfaceType())
1329 return transferNullability(Context.getObjCObjectPointerType(ReceiverType));
1330 // - if the receiver is of type Class or qualified Class type,
1331 // T is the declared return type of the method.
1332 if (ReceiverType->isObjCClassType() ||
1333 ReceiverType->isObjCQualifiedClassType())
1334 return stripObjCInstanceType(Context,
1335 Method->getSendResultType(ReceiverType));
1336
1337 // - if the receiver is id, qualified id, Class, or qualified Class, T
1338 // is the receiver type, otherwise
1339 // - T is the type of the receiver expression.
1340 return transferNullability(ReceiverType);
1341 }
1342
getMessageSendResultType(QualType ReceiverType,ObjCMethodDecl * Method,bool isClassMessage,bool isSuperMessage)1343 QualType Sema::getMessageSendResultType(QualType ReceiverType,
1344 ObjCMethodDecl *Method,
1345 bool isClassMessage,
1346 bool isSuperMessage) {
1347 // Produce the result type.
1348 QualType resultType = getBaseMessageSendResultType(*this, ReceiverType,
1349 Method,
1350 isClassMessage,
1351 isSuperMessage);
1352
1353 // If this is a class message, ignore the nullability of the receiver.
1354 if (isClassMessage)
1355 return resultType;
1356
1357 // Map the nullability of the result into a table index.
1358 unsigned receiverNullabilityIdx = 0;
1359 if (auto nullability = ReceiverType->getNullability(Context))
1360 receiverNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1361
1362 unsigned resultNullabilityIdx = 0;
1363 if (auto nullability = resultType->getNullability(Context))
1364 resultNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1365
1366 // The table of nullability mappings, indexed by the receiver's nullability
1367 // and then the result type's nullability.
1368 static const uint8_t None = 0;
1369 static const uint8_t NonNull = 1;
1370 static const uint8_t Nullable = 2;
1371 static const uint8_t Unspecified = 3;
1372 static const uint8_t nullabilityMap[4][4] = {
1373 // None NonNull Nullable Unspecified
1374 /* None */ { None, None, Nullable, None },
1375 /* NonNull */ { None, NonNull, Nullable, Unspecified },
1376 /* Nullable */ { Nullable, Nullable, Nullable, Nullable },
1377 /* Unspecified */ { None, Unspecified, Nullable, Unspecified }
1378 };
1379
1380 unsigned newResultNullabilityIdx
1381 = nullabilityMap[receiverNullabilityIdx][resultNullabilityIdx];
1382 if (newResultNullabilityIdx == resultNullabilityIdx)
1383 return resultType;
1384
1385 // Strip off the existing nullability. This removes as little type sugar as
1386 // possible.
1387 do {
1388 if (auto attributed = dyn_cast<AttributedType>(resultType.getTypePtr())) {
1389 resultType = attributed->getModifiedType();
1390 } else {
1391 resultType = resultType.getDesugaredType(Context);
1392 }
1393 } while (resultType->getNullability(Context));
1394
1395 // Add nullability back if needed.
1396 if (newResultNullabilityIdx > 0) {
1397 auto newNullability
1398 = static_cast<NullabilityKind>(newResultNullabilityIdx-1);
1399 return Context.getAttributedType(
1400 AttributedType::getNullabilityAttrKind(newNullability),
1401 resultType, resultType);
1402 }
1403
1404 return resultType;
1405 }
1406
1407 /// Look for an ObjC method whose result type exactly matches the given type.
1408 static const ObjCMethodDecl *
findExplicitInstancetypeDeclarer(const ObjCMethodDecl * MD,QualType instancetype)1409 findExplicitInstancetypeDeclarer(const ObjCMethodDecl *MD,
1410 QualType instancetype) {
1411 if (MD->getReturnType() == instancetype)
1412 return MD;
1413
1414 // For these purposes, a method in an @implementation overrides a
1415 // declaration in the @interface.
1416 if (const ObjCImplDecl *impl =
1417 dyn_cast<ObjCImplDecl>(MD->getDeclContext())) {
1418 const ObjCContainerDecl *iface;
1419 if (const ObjCCategoryImplDecl *catImpl =
1420 dyn_cast<ObjCCategoryImplDecl>(impl)) {
1421 iface = catImpl->getCategoryDecl();
1422 } else {
1423 iface = impl->getClassInterface();
1424 }
1425
1426 const ObjCMethodDecl *ifaceMD =
1427 iface->getMethod(MD->getSelector(), MD->isInstanceMethod());
1428 if (ifaceMD) return findExplicitInstancetypeDeclarer(ifaceMD, instancetype);
1429 }
1430
1431 SmallVector<const ObjCMethodDecl *, 4> overrides;
1432 MD->getOverriddenMethods(overrides);
1433 for (unsigned i = 0, e = overrides.size(); i != e; ++i) {
1434 if (const ObjCMethodDecl *result =
1435 findExplicitInstancetypeDeclarer(overrides[i], instancetype))
1436 return result;
1437 }
1438
1439 return nullptr;
1440 }
1441
EmitRelatedResultTypeNoteForReturn(QualType destType)1442 void Sema::EmitRelatedResultTypeNoteForReturn(QualType destType) {
1443 // Only complain if we're in an ObjC method and the required return
1444 // type doesn't match the method's declared return type.
1445 ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurContext);
1446 if (!MD || !MD->hasRelatedResultType() ||
1447 Context.hasSameUnqualifiedType(destType, MD->getReturnType()))
1448 return;
1449
1450 // Look for a method overridden by this method which explicitly uses
1451 // 'instancetype'.
1452 if (const ObjCMethodDecl *overridden =
1453 findExplicitInstancetypeDeclarer(MD, Context.getObjCInstanceType())) {
1454 SourceRange range = overridden->getReturnTypeSourceRange();
1455 SourceLocation loc = range.getBegin();
1456 if (loc.isInvalid())
1457 loc = overridden->getLocation();
1458 Diag(loc, diag::note_related_result_type_explicit)
1459 << /*current method*/ 1 << range;
1460 return;
1461 }
1462
1463 // Otherwise, if we have an interesting method family, note that.
1464 // This should always trigger if the above didn't.
1465 if (ObjCMethodFamily family = MD->getMethodFamily())
1466 Diag(MD->getLocation(), diag::note_related_result_type_family)
1467 << /*current method*/ 1
1468 << family;
1469 }
1470
EmitRelatedResultTypeNote(const Expr * E)1471 void Sema::EmitRelatedResultTypeNote(const Expr *E) {
1472 E = E->IgnoreParenImpCasts();
1473 const ObjCMessageExpr *MsgSend = dyn_cast<ObjCMessageExpr>(E);
1474 if (!MsgSend)
1475 return;
1476
1477 const ObjCMethodDecl *Method = MsgSend->getMethodDecl();
1478 if (!Method)
1479 return;
1480
1481 if (!Method->hasRelatedResultType())
1482 return;
1483
1484 if (Context.hasSameUnqualifiedType(
1485 Method->getReturnType().getNonReferenceType(), MsgSend->getType()))
1486 return;
1487
1488 if (!Context.hasSameUnqualifiedType(Method->getReturnType(),
1489 Context.getObjCInstanceType()))
1490 return;
1491
1492 Diag(Method->getLocation(), diag::note_related_result_type_inferred)
1493 << Method->isInstanceMethod() << Method->getSelector()
1494 << MsgSend->getType();
1495 }
1496
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)1497 bool Sema::CheckMessageArgumentTypes(QualType ReceiverType,
1498 MultiExprArg Args,
1499 Selector Sel,
1500 ArrayRef<SourceLocation> SelectorLocs,
1501 ObjCMethodDecl *Method,
1502 bool isClassMessage, bool isSuperMessage,
1503 SourceLocation lbrac, SourceLocation rbrac,
1504 SourceRange RecRange,
1505 QualType &ReturnType, ExprValueKind &VK) {
1506 SourceLocation SelLoc;
1507 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
1508 SelLoc = SelectorLocs.front();
1509 else
1510 SelLoc = lbrac;
1511
1512 if (!Method) {
1513 // Apply default argument promotion as for (C99 6.5.2.2p6).
1514 for (unsigned i = 0, e = Args.size(); i != e; i++) {
1515 if (Args[i]->isTypeDependent())
1516 continue;
1517
1518 ExprResult result;
1519 if (getLangOpts().DebuggerSupport) {
1520 QualType paramTy; // ignored
1521 result = checkUnknownAnyArg(SelLoc, Args[i], paramTy);
1522 } else {
1523 result = DefaultArgumentPromotion(Args[i]);
1524 }
1525 if (result.isInvalid())
1526 return true;
1527 Args[i] = result.get();
1528 }
1529
1530 unsigned DiagID;
1531 if (getLangOpts().ObjCAutoRefCount)
1532 DiagID = diag::err_arc_method_not_found;
1533 else
1534 DiagID = isClassMessage ? diag::warn_class_method_not_found
1535 : diag::warn_inst_method_not_found;
1536 if (!getLangOpts().DebuggerSupport) {
1537 const ObjCMethodDecl *OMD = SelectorsForTypoCorrection(Sel, ReceiverType);
1538 if (OMD && !OMD->isInvalidDecl()) {
1539 if (getLangOpts().ObjCAutoRefCount)
1540 DiagID = diag::error_method_not_found_with_typo;
1541 else
1542 DiagID = isClassMessage ? diag::warn_class_method_not_found_with_typo
1543 : diag::warn_instance_method_not_found_with_typo;
1544 Selector MatchedSel = OMD->getSelector();
1545 SourceRange SelectorRange(SelectorLocs.front(), SelectorLocs.back());
1546 if (MatchedSel.isUnarySelector())
1547 Diag(SelLoc, DiagID)
1548 << Sel<< isClassMessage << MatchedSel
1549 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1550 else
1551 Diag(SelLoc, DiagID) << Sel<< isClassMessage << MatchedSel;
1552 }
1553 else
1554 Diag(SelLoc, DiagID)
1555 << Sel << isClassMessage << SourceRange(SelectorLocs.front(),
1556 SelectorLocs.back());
1557 // Find the class to which we are sending this message.
1558 if (ReceiverType->isObjCObjectPointerType()) {
1559 if (ObjCInterfaceDecl *ThisClass =
1560 ReceiverType->getAs<ObjCObjectPointerType>()->getInterfaceDecl()) {
1561 Diag(ThisClass->getLocation(), diag::note_receiver_class_declared);
1562 if (!RecRange.isInvalid())
1563 if (ThisClass->lookupClassMethod(Sel))
1564 Diag(RecRange.getBegin(),diag::note_receiver_expr_here)
1565 << FixItHint::CreateReplacement(RecRange,
1566 ThisClass->getNameAsString());
1567 }
1568 }
1569 }
1570
1571 // In debuggers, we want to use __unknown_anytype for these
1572 // results so that clients can cast them.
1573 if (getLangOpts().DebuggerSupport) {
1574 ReturnType = Context.UnknownAnyTy;
1575 } else {
1576 ReturnType = Context.getObjCIdType();
1577 }
1578 VK = VK_RValue;
1579 return false;
1580 }
1581
1582 ReturnType = getMessageSendResultType(ReceiverType, Method, isClassMessage,
1583 isSuperMessage);
1584 VK = Expr::getValueKindForType(Method->getReturnType());
1585
1586 unsigned NumNamedArgs = Sel.getNumArgs();
1587 // Method might have more arguments than selector indicates. This is due
1588 // to addition of c-style arguments in method.
1589 if (Method->param_size() > Sel.getNumArgs())
1590 NumNamedArgs = Method->param_size();
1591 // FIXME. This need be cleaned up.
1592 if (Args.size() < NumNamedArgs) {
1593 Diag(SelLoc, diag::err_typecheck_call_too_few_args)
1594 << 2 << NumNamedArgs << static_cast<unsigned>(Args.size());
1595 return false;
1596 }
1597
1598 // Compute the set of type arguments to be substituted into each parameter
1599 // type.
1600 Optional<ArrayRef<QualType>> typeArgs
1601 = ReceiverType->getObjCSubstitutions(Method->getDeclContext());
1602 bool IsError = false;
1603 for (unsigned i = 0; i < NumNamedArgs; i++) {
1604 // We can't do any type-checking on a type-dependent argument.
1605 if (Args[i]->isTypeDependent())
1606 continue;
1607
1608 Expr *argExpr = Args[i];
1609
1610 ParmVarDecl *param = Method->parameters()[i];
1611 assert(argExpr && "CheckMessageArgumentTypes(): missing expression");
1612
1613 // Strip the unbridged-cast placeholder expression off unless it's
1614 // a consumed argument.
1615 if (argExpr->hasPlaceholderType(BuiltinType::ARCUnbridgedCast) &&
1616 !param->hasAttr<CFConsumedAttr>())
1617 argExpr = stripARCUnbridgedCast(argExpr);
1618
1619 // If the parameter is __unknown_anytype, infer its type
1620 // from the argument.
1621 if (param->getType() == Context.UnknownAnyTy) {
1622 QualType paramType;
1623 ExprResult argE = checkUnknownAnyArg(SelLoc, argExpr, paramType);
1624 if (argE.isInvalid()) {
1625 IsError = true;
1626 } else {
1627 Args[i] = argE.get();
1628
1629 // Update the parameter type in-place.
1630 param->setType(paramType);
1631 }
1632 continue;
1633 }
1634
1635 QualType origParamType = param->getType();
1636 QualType paramType = param->getType();
1637 if (typeArgs)
1638 paramType = paramType.substObjCTypeArgs(
1639 Context,
1640 *typeArgs,
1641 ObjCSubstitutionContext::Parameter);
1642
1643 if (RequireCompleteType(argExpr->getSourceRange().getBegin(),
1644 paramType,
1645 diag::err_call_incomplete_argument, argExpr))
1646 return true;
1647
1648 InitializedEntity Entity
1649 = InitializedEntity::InitializeParameter(Context, param, paramType);
1650 ExprResult ArgE = PerformCopyInitialization(Entity, SourceLocation(), argExpr);
1651 if (ArgE.isInvalid())
1652 IsError = true;
1653 else {
1654 Args[i] = ArgE.getAs<Expr>();
1655
1656 // If we are type-erasing a block to a block-compatible
1657 // Objective-C pointer type, we may need to extend the lifetime
1658 // of the block object.
1659 if (typeArgs && Args[i]->isRValue() && paramType->isBlockPointerType() &&
1660 Args[i]->getType()->isBlockPointerType() &&
1661 origParamType->isObjCObjectPointerType()) {
1662 ExprResult arg = Args[i];
1663 maybeExtendBlockObject(arg);
1664 Args[i] = arg.get();
1665 }
1666 }
1667 }
1668
1669 // Promote additional arguments to variadic methods.
1670 if (Method->isVariadic()) {
1671 for (unsigned i = NumNamedArgs, e = Args.size(); i < e; ++i) {
1672 if (Args[i]->isTypeDependent())
1673 continue;
1674
1675 ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], VariadicMethod,
1676 nullptr);
1677 IsError |= Arg.isInvalid();
1678 Args[i] = Arg.get();
1679 }
1680 } else {
1681 // Check for extra arguments to non-variadic methods.
1682 if (Args.size() != NumNamedArgs) {
1683 Diag(Args[NumNamedArgs]->getLocStart(),
1684 diag::err_typecheck_call_too_many_args)
1685 << 2 /*method*/ << NumNamedArgs << static_cast<unsigned>(Args.size())
1686 << Method->getSourceRange()
1687 << SourceRange(Args[NumNamedArgs]->getLocStart(),
1688 Args.back()->getLocEnd());
1689 }
1690 }
1691
1692 DiagnoseSentinelCalls(Method, SelLoc, Args);
1693
1694 // Do additional checkings on method.
1695 IsError |= CheckObjCMethodCall(
1696 Method, SelLoc, makeArrayRef(Args.data(), Args.size()));
1697
1698 return IsError;
1699 }
1700
isSelfExpr(Expr * RExpr)1701 bool Sema::isSelfExpr(Expr *RExpr) {
1702 // 'self' is objc 'self' in an objc method only.
1703 ObjCMethodDecl *Method =
1704 dyn_cast_or_null<ObjCMethodDecl>(CurContext->getNonClosureAncestor());
1705 return isSelfExpr(RExpr, Method);
1706 }
1707
isSelfExpr(Expr * receiver,const ObjCMethodDecl * method)1708 bool Sema::isSelfExpr(Expr *receiver, const ObjCMethodDecl *method) {
1709 if (!method) return false;
1710
1711 receiver = receiver->IgnoreParenLValueCasts();
1712 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(receiver))
1713 if (DRE->getDecl() == method->getSelfDecl())
1714 return true;
1715 return false;
1716 }
1717
1718 /// LookupMethodInType - Look up a method in an ObjCObjectType.
LookupMethodInObjectType(Selector sel,QualType type,bool isInstance)1719 ObjCMethodDecl *Sema::LookupMethodInObjectType(Selector sel, QualType type,
1720 bool isInstance) {
1721 const ObjCObjectType *objType = type->castAs<ObjCObjectType>();
1722 if (ObjCInterfaceDecl *iface = objType->getInterface()) {
1723 // Look it up in the main interface (and categories, etc.)
1724 if (ObjCMethodDecl *method = iface->lookupMethod(sel, isInstance))
1725 return method;
1726
1727 // Okay, look for "private" methods declared in any
1728 // @implementations we've seen.
1729 if (ObjCMethodDecl *method = iface->lookupPrivateMethod(sel, isInstance))
1730 return method;
1731 }
1732
1733 // Check qualifiers.
1734 for (const auto *I : objType->quals())
1735 if (ObjCMethodDecl *method = I->lookupMethod(sel, isInstance))
1736 return method;
1737
1738 return nullptr;
1739 }
1740
1741 /// LookupMethodInQualifiedType - Lookups up a method in protocol qualifier
1742 /// list of a qualified objective pointer type.
LookupMethodInQualifiedType(Selector Sel,const ObjCObjectPointerType * OPT,bool Instance)1743 ObjCMethodDecl *Sema::LookupMethodInQualifiedType(Selector Sel,
1744 const ObjCObjectPointerType *OPT,
1745 bool Instance)
1746 {
1747 ObjCMethodDecl *MD = nullptr;
1748 for (const auto *PROTO : OPT->quals()) {
1749 if ((MD = PROTO->lookupMethod(Sel, Instance))) {
1750 return MD;
1751 }
1752 }
1753 return nullptr;
1754 }
1755
1756 /// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an
1757 /// objective C interface. This is a property reference expression.
1758 ExprResult Sema::
HandleExprPropertyRefExpr(const ObjCObjectPointerType * OPT,Expr * BaseExpr,SourceLocation OpLoc,DeclarationName MemberName,SourceLocation MemberLoc,SourceLocation SuperLoc,QualType SuperType,bool Super)1759 HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT,
1760 Expr *BaseExpr, SourceLocation OpLoc,
1761 DeclarationName MemberName,
1762 SourceLocation MemberLoc,
1763 SourceLocation SuperLoc, QualType SuperType,
1764 bool Super) {
1765 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType();
1766 ObjCInterfaceDecl *IFace = IFaceT->getDecl();
1767
1768 if (!MemberName.isIdentifier()) {
1769 Diag(MemberLoc, diag::err_invalid_property_name)
1770 << MemberName << QualType(OPT, 0);
1771 return ExprError();
1772 }
1773
1774 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
1775
1776 SourceRange BaseRange = Super? SourceRange(SuperLoc)
1777 : BaseExpr->getSourceRange();
1778 if (RequireCompleteType(MemberLoc, OPT->getPointeeType(),
1779 diag::err_property_not_found_forward_class,
1780 MemberName, BaseRange))
1781 return ExprError();
1782
1783 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Member)) {
1784 // Check whether we can reference this property.
1785 if (DiagnoseUseOfDecl(PD, MemberLoc))
1786 return ExprError();
1787 if (Super)
1788 return new (Context)
1789 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1790 OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1791 else
1792 return new (Context)
1793 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1794 OK_ObjCProperty, MemberLoc, BaseExpr);
1795 }
1796 // Check protocols on qualified interfaces.
1797 for (const auto *I : OPT->quals())
1798 if (ObjCPropertyDecl *PD = I->FindPropertyDeclaration(Member)) {
1799 // Check whether we can reference this property.
1800 if (DiagnoseUseOfDecl(PD, MemberLoc))
1801 return ExprError();
1802
1803 if (Super)
1804 return new (Context) ObjCPropertyRefExpr(
1805 PD, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty, MemberLoc,
1806 SuperLoc, SuperType);
1807 else
1808 return new (Context)
1809 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1810 OK_ObjCProperty, MemberLoc, BaseExpr);
1811 }
1812 // If that failed, look for an "implicit" property by seeing if the nullary
1813 // selector is implemented.
1814
1815 // FIXME: The logic for looking up nullary and unary selectors should be
1816 // shared with the code in ActOnInstanceMessage.
1817
1818 Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
1819 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
1820
1821 // May be founf in property's qualified list.
1822 if (!Getter)
1823 Getter = LookupMethodInQualifiedType(Sel, OPT, true);
1824
1825 // If this reference is in an @implementation, check for 'private' methods.
1826 if (!Getter)
1827 Getter = IFace->lookupPrivateMethod(Sel);
1828
1829 if (Getter) {
1830 // Check if we can reference this property.
1831 if (DiagnoseUseOfDecl(Getter, MemberLoc))
1832 return ExprError();
1833 }
1834 // If we found a getter then this may be a valid dot-reference, we
1835 // will look for the matching setter, in case it is needed.
1836 Selector SetterSel =
1837 SelectorTable::constructSetterSelector(PP.getIdentifierTable(),
1838 PP.getSelectorTable(), Member);
1839 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel);
1840
1841 // May be founf in property's qualified list.
1842 if (!Setter)
1843 Setter = LookupMethodInQualifiedType(SetterSel, OPT, true);
1844
1845 if (!Setter) {
1846 // If this reference is in an @implementation, also check for 'private'
1847 // methods.
1848 Setter = IFace->lookupPrivateMethod(SetterSel);
1849 }
1850
1851 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc))
1852 return ExprError();
1853
1854 // Special warning if member name used in a property-dot for a setter accessor
1855 // does not use a property with same name; e.g. obj.X = ... for a property with
1856 // name 'x'.
1857 if (Setter && Setter->isImplicit() && Setter->isPropertyAccessor()
1858 && !IFace->FindPropertyDeclaration(Member)) {
1859 if (const ObjCPropertyDecl *PDecl = Setter->findPropertyDecl()) {
1860 // Do not warn if user is using property-dot syntax to make call to
1861 // user named setter.
1862 if (!(PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter))
1863 Diag(MemberLoc,
1864 diag::warn_property_access_suggest)
1865 << MemberName << QualType(OPT, 0) << PDecl->getName()
1866 << FixItHint::CreateReplacement(MemberLoc, PDecl->getName());
1867 }
1868 }
1869
1870 if (Getter || Setter) {
1871 if (Super)
1872 return new (Context)
1873 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1874 OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1875 else
1876 return new (Context)
1877 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1878 OK_ObjCProperty, MemberLoc, BaseExpr);
1879
1880 }
1881
1882 // Attempt to correct for typos in property names.
1883 if (TypoCorrection Corrected =
1884 CorrectTypo(DeclarationNameInfo(MemberName, MemberLoc),
1885 LookupOrdinaryName, nullptr, nullptr,
1886 llvm::make_unique<DeclFilterCCC<ObjCPropertyDecl>>(),
1887 CTK_ErrorRecovery, IFace, false, OPT)) {
1888 diagnoseTypo(Corrected, PDiag(diag::err_property_not_found_suggest)
1889 << MemberName << QualType(OPT, 0));
1890 DeclarationName TypoResult = Corrected.getCorrection();
1891 return HandleExprPropertyRefExpr(OPT, BaseExpr, OpLoc,
1892 TypoResult, MemberLoc,
1893 SuperLoc, SuperType, Super);
1894 }
1895 ObjCInterfaceDecl *ClassDeclared;
1896 if (ObjCIvarDecl *Ivar =
1897 IFace->lookupInstanceVariable(Member, ClassDeclared)) {
1898 QualType T = Ivar->getType();
1899 if (const ObjCObjectPointerType * OBJPT =
1900 T->getAsObjCInterfacePointerType()) {
1901 if (RequireCompleteType(MemberLoc, OBJPT->getPointeeType(),
1902 diag::err_property_not_as_forward_class,
1903 MemberName, BaseExpr))
1904 return ExprError();
1905 }
1906 Diag(MemberLoc,
1907 diag::err_ivar_access_using_property_syntax_suggest)
1908 << MemberName << QualType(OPT, 0) << Ivar->getDeclName()
1909 << FixItHint::CreateReplacement(OpLoc, "->");
1910 return ExprError();
1911 }
1912
1913 Diag(MemberLoc, diag::err_property_not_found)
1914 << MemberName << QualType(OPT, 0);
1915 if (Setter)
1916 Diag(Setter->getLocation(), diag::note_getter_unavailable)
1917 << MemberName << BaseExpr->getSourceRange();
1918 return ExprError();
1919 }
1920
1921
1922
1923 ExprResult Sema::
ActOnClassPropertyRefExpr(IdentifierInfo & receiverName,IdentifierInfo & propertyName,SourceLocation receiverNameLoc,SourceLocation propertyNameLoc)1924 ActOnClassPropertyRefExpr(IdentifierInfo &receiverName,
1925 IdentifierInfo &propertyName,
1926 SourceLocation receiverNameLoc,
1927 SourceLocation propertyNameLoc) {
1928
1929 IdentifierInfo *receiverNamePtr = &receiverName;
1930 ObjCInterfaceDecl *IFace = getObjCInterfaceDecl(receiverNamePtr,
1931 receiverNameLoc);
1932
1933 QualType SuperType;
1934 if (!IFace) {
1935 // If the "receiver" is 'super' in a method, handle it as an expression-like
1936 // property reference.
1937 if (receiverNamePtr->isStr("super")) {
1938 if (ObjCMethodDecl *CurMethod = tryCaptureObjCSelf(receiverNameLoc)) {
1939 if (auto classDecl = CurMethod->getClassInterface()) {
1940 SuperType = QualType(classDecl->getSuperClassType(), 0);
1941 if (CurMethod->isInstanceMethod()) {
1942 if (SuperType.isNull()) {
1943 // The current class does not have a superclass.
1944 Diag(receiverNameLoc, diag::error_root_class_cannot_use_super)
1945 << CurMethod->getClassInterface()->getIdentifier();
1946 return ExprError();
1947 }
1948 QualType T = Context.getObjCObjectPointerType(SuperType);
1949
1950 return HandleExprPropertyRefExpr(T->castAs<ObjCObjectPointerType>(),
1951 /*BaseExpr*/nullptr,
1952 SourceLocation()/*OpLoc*/,
1953 &propertyName,
1954 propertyNameLoc,
1955 receiverNameLoc, T, true);
1956 }
1957
1958 // Otherwise, if this is a class method, try dispatching to our
1959 // superclass.
1960 IFace = CurMethod->getClassInterface()->getSuperClass();
1961 }
1962 }
1963 }
1964
1965 if (!IFace) {
1966 Diag(receiverNameLoc, diag::err_expected_either) << tok::identifier
1967 << tok::l_paren;
1968 return ExprError();
1969 }
1970 }
1971
1972 // Search for a declared property first.
1973 Selector Sel = PP.getSelectorTable().getNullarySelector(&propertyName);
1974 ObjCMethodDecl *Getter = IFace->lookupClassMethod(Sel);
1975
1976 // If this reference is in an @implementation, check for 'private' methods.
1977 if (!Getter)
1978 Getter = IFace->lookupPrivateClassMethod(Sel);
1979
1980 if (Getter) {
1981 // FIXME: refactor/share with ActOnMemberReference().
1982 // Check if we can reference this property.
1983 if (DiagnoseUseOfDecl(Getter, propertyNameLoc))
1984 return ExprError();
1985 }
1986
1987 // Look for the matching setter, in case it is needed.
1988 Selector SetterSel =
1989 SelectorTable::constructSetterSelector(PP.getIdentifierTable(),
1990 PP.getSelectorTable(),
1991 &propertyName);
1992
1993 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel);
1994 if (!Setter) {
1995 // If this reference is in an @implementation, also check for 'private'
1996 // methods.
1997 Setter = IFace->lookupPrivateClassMethod(SetterSel);
1998 }
1999 // Look through local category implementations associated with the class.
2000 if (!Setter)
2001 Setter = IFace->getCategoryClassMethod(SetterSel);
2002
2003 if (Setter && DiagnoseUseOfDecl(Setter, propertyNameLoc))
2004 return ExprError();
2005
2006 if (Getter || Setter) {
2007 if (!SuperType.isNull())
2008 return new (Context)
2009 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
2010 OK_ObjCProperty, propertyNameLoc, receiverNameLoc,
2011 SuperType);
2012
2013 return new (Context) ObjCPropertyRefExpr(
2014 Getter, Setter, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty,
2015 propertyNameLoc, receiverNameLoc, IFace);
2016 }
2017 return ExprError(Diag(propertyNameLoc, diag::err_property_not_found)
2018 << &propertyName << Context.getObjCInterfaceType(IFace));
2019 }
2020
2021 namespace {
2022
2023 class ObjCInterfaceOrSuperCCC : public CorrectionCandidateCallback {
2024 public:
ObjCInterfaceOrSuperCCC(ObjCMethodDecl * Method)2025 ObjCInterfaceOrSuperCCC(ObjCMethodDecl *Method) {
2026 // Determine whether "super" is acceptable in the current context.
2027 if (Method && Method->getClassInterface())
2028 WantObjCSuper = Method->getClassInterface()->getSuperClass();
2029 }
2030
ValidateCandidate(const TypoCorrection & candidate)2031 bool ValidateCandidate(const TypoCorrection &candidate) override {
2032 return candidate.getCorrectionDeclAs<ObjCInterfaceDecl>() ||
2033 candidate.isKeyword("super");
2034 }
2035 };
2036
2037 }
2038
getObjCMessageKind(Scope * S,IdentifierInfo * Name,SourceLocation NameLoc,bool IsSuper,bool HasTrailingDot,ParsedType & ReceiverType)2039 Sema::ObjCMessageKind Sema::getObjCMessageKind(Scope *S,
2040 IdentifierInfo *Name,
2041 SourceLocation NameLoc,
2042 bool IsSuper,
2043 bool HasTrailingDot,
2044 ParsedType &ReceiverType) {
2045 ReceiverType = ParsedType();
2046
2047 // If the identifier is "super" and there is no trailing dot, we're
2048 // messaging super. If the identifier is "super" and there is a
2049 // trailing dot, it's an instance message.
2050 if (IsSuper && S->isInObjcMethodScope())
2051 return HasTrailingDot? ObjCInstanceMessage : ObjCSuperMessage;
2052
2053 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName);
2054 LookupName(Result, S);
2055
2056 switch (Result.getResultKind()) {
2057 case LookupResult::NotFound:
2058 // Normal name lookup didn't find anything. If we're in an
2059 // Objective-C method, look for ivars. If we find one, we're done!
2060 // FIXME: This is a hack. Ivar lookup should be part of normal
2061 // lookup.
2062 if (ObjCMethodDecl *Method = getCurMethodDecl()) {
2063 if (!Method->getClassInterface()) {
2064 // Fall back: let the parser try to parse it as an instance message.
2065 return ObjCInstanceMessage;
2066 }
2067
2068 ObjCInterfaceDecl *ClassDeclared;
2069 if (Method->getClassInterface()->lookupInstanceVariable(Name,
2070 ClassDeclared))
2071 return ObjCInstanceMessage;
2072 }
2073
2074 // Break out; we'll perform typo correction below.
2075 break;
2076
2077 case LookupResult::NotFoundInCurrentInstantiation:
2078 case LookupResult::FoundOverloaded:
2079 case LookupResult::FoundUnresolvedValue:
2080 case LookupResult::Ambiguous:
2081 Result.suppressDiagnostics();
2082 return ObjCInstanceMessage;
2083
2084 case LookupResult::Found: {
2085 // If the identifier is a class or not, and there is a trailing dot,
2086 // it's an instance message.
2087 if (HasTrailingDot)
2088 return ObjCInstanceMessage;
2089 // We found something. If it's a type, then we have a class
2090 // message. Otherwise, it's an instance message.
2091 NamedDecl *ND = Result.getFoundDecl();
2092 QualType T;
2093 if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND))
2094 T = Context.getObjCInterfaceType(Class);
2095 else if (TypeDecl *Type = dyn_cast<TypeDecl>(ND)) {
2096 T = Context.getTypeDeclType(Type);
2097 DiagnoseUseOfDecl(Type, NameLoc);
2098 }
2099 else
2100 return ObjCInstanceMessage;
2101
2102 // We have a class message, and T is the type we're
2103 // messaging. Build source-location information for it.
2104 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2105 ReceiverType = CreateParsedType(T, TSInfo);
2106 return ObjCClassMessage;
2107 }
2108 }
2109
2110 if (TypoCorrection Corrected = CorrectTypo(
2111 Result.getLookupNameInfo(), Result.getLookupKind(), S, nullptr,
2112 llvm::make_unique<ObjCInterfaceOrSuperCCC>(getCurMethodDecl()),
2113 CTK_ErrorRecovery, nullptr, false, nullptr, false)) {
2114 if (Corrected.isKeyword()) {
2115 // If we've found the keyword "super" (the only keyword that would be
2116 // returned by CorrectTypo), this is a send to super.
2117 diagnoseTypo(Corrected,
2118 PDiag(diag::err_unknown_receiver_suggest) << Name);
2119 return ObjCSuperMessage;
2120 } else if (ObjCInterfaceDecl *Class =
2121 Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>()) {
2122 // If we found a declaration, correct when it refers to an Objective-C
2123 // class.
2124 diagnoseTypo(Corrected,
2125 PDiag(diag::err_unknown_receiver_suggest) << Name);
2126 QualType T = Context.getObjCInterfaceType(Class);
2127 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2128 ReceiverType = CreateParsedType(T, TSInfo);
2129 return ObjCClassMessage;
2130 }
2131 }
2132
2133 // Fall back: let the parser try to parse it as an instance message.
2134 return ObjCInstanceMessage;
2135 }
2136
ActOnSuperMessage(Scope * S,SourceLocation SuperLoc,Selector Sel,SourceLocation LBracLoc,ArrayRef<SourceLocation> SelectorLocs,SourceLocation RBracLoc,MultiExprArg Args)2137 ExprResult Sema::ActOnSuperMessage(Scope *S,
2138 SourceLocation SuperLoc,
2139 Selector Sel,
2140 SourceLocation LBracLoc,
2141 ArrayRef<SourceLocation> SelectorLocs,
2142 SourceLocation RBracLoc,
2143 MultiExprArg Args) {
2144 // Determine whether we are inside a method or not.
2145 ObjCMethodDecl *Method = tryCaptureObjCSelf(SuperLoc);
2146 if (!Method) {
2147 Diag(SuperLoc, diag::err_invalid_receiver_to_message_super);
2148 return ExprError();
2149 }
2150
2151 ObjCInterfaceDecl *Class = Method->getClassInterface();
2152 if (!Class) {
2153 Diag(SuperLoc, diag::error_no_super_class_message)
2154 << Method->getDeclName();
2155 return ExprError();
2156 }
2157
2158 QualType SuperTy(Class->getSuperClassType(), 0);
2159 if (SuperTy.isNull()) {
2160 // The current class does not have a superclass.
2161 Diag(SuperLoc, diag::error_root_class_cannot_use_super)
2162 << Class->getIdentifier();
2163 return ExprError();
2164 }
2165
2166 // We are in a method whose class has a superclass, so 'super'
2167 // is acting as a keyword.
2168 if (Method->getSelector() == Sel)
2169 getCurFunction()->ObjCShouldCallSuper = false;
2170
2171 if (Method->isInstanceMethod()) {
2172 // Since we are in an instance method, this is an instance
2173 // message to the superclass instance.
2174 SuperTy = Context.getObjCObjectPointerType(SuperTy);
2175 return BuildInstanceMessage(nullptr, SuperTy, SuperLoc,
2176 Sel, /*Method=*/nullptr,
2177 LBracLoc, SelectorLocs, RBracLoc, Args);
2178 }
2179
2180 // Since we are in a class method, this is a class message to
2181 // the superclass.
2182 return BuildClassMessage(/*ReceiverTypeInfo=*/nullptr,
2183 SuperTy,
2184 SuperLoc, Sel, /*Method=*/nullptr,
2185 LBracLoc, SelectorLocs, RBracLoc, Args);
2186 }
2187
2188
BuildClassMessageImplicit(QualType ReceiverType,bool isSuperReceiver,SourceLocation Loc,Selector Sel,ObjCMethodDecl * Method,MultiExprArg Args)2189 ExprResult Sema::BuildClassMessageImplicit(QualType ReceiverType,
2190 bool isSuperReceiver,
2191 SourceLocation Loc,
2192 Selector Sel,
2193 ObjCMethodDecl *Method,
2194 MultiExprArg Args) {
2195 TypeSourceInfo *receiverTypeInfo = nullptr;
2196 if (!ReceiverType.isNull())
2197 receiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType);
2198
2199 return BuildClassMessage(receiverTypeInfo, ReceiverType,
2200 /*SuperLoc=*/isSuperReceiver ? Loc : SourceLocation(),
2201 Sel, Method, Loc, Loc, Loc, Args,
2202 /*isImplicit=*/true);
2203
2204 }
2205
applyCocoaAPICheck(Sema & S,const ObjCMessageExpr * Msg,unsigned DiagID,bool (* refactor)(const ObjCMessageExpr *,const NSAPI &,edit::Commit &))2206 static void applyCocoaAPICheck(Sema &S, const ObjCMessageExpr *Msg,
2207 unsigned DiagID,
2208 bool (*refactor)(const ObjCMessageExpr *,
2209 const NSAPI &, edit::Commit &)) {
2210 SourceLocation MsgLoc = Msg->getExprLoc();
2211 if (S.Diags.isIgnored(DiagID, MsgLoc))
2212 return;
2213
2214 SourceManager &SM = S.SourceMgr;
2215 edit::Commit ECommit(SM, S.LangOpts);
2216 if (refactor(Msg,*S.NSAPIObj, ECommit)) {
2217 DiagnosticBuilder Builder = S.Diag(MsgLoc, DiagID)
2218 << Msg->getSelector() << Msg->getSourceRange();
2219 // FIXME: Don't emit diagnostic at all if fixits are non-commitable.
2220 if (!ECommit.isCommitable())
2221 return;
2222 for (edit::Commit::edit_iterator
2223 I = ECommit.edit_begin(), E = ECommit.edit_end(); I != E; ++I) {
2224 const edit::Commit::Edit &Edit = *I;
2225 switch (Edit.Kind) {
2226 case edit::Commit::Act_Insert:
2227 Builder.AddFixItHint(FixItHint::CreateInsertion(Edit.OrigLoc,
2228 Edit.Text,
2229 Edit.BeforePrev));
2230 break;
2231 case edit::Commit::Act_InsertFromRange:
2232 Builder.AddFixItHint(
2233 FixItHint::CreateInsertionFromRange(Edit.OrigLoc,
2234 Edit.getInsertFromRange(SM),
2235 Edit.BeforePrev));
2236 break;
2237 case edit::Commit::Act_Remove:
2238 Builder.AddFixItHint(FixItHint::CreateRemoval(Edit.getFileRange(SM)));
2239 break;
2240 }
2241 }
2242 }
2243 }
2244
checkCocoaAPI(Sema & S,const ObjCMessageExpr * Msg)2245 static void checkCocoaAPI(Sema &S, const ObjCMessageExpr *Msg) {
2246 applyCocoaAPICheck(S, Msg, diag::warn_objc_redundant_literal_use,
2247 edit::rewriteObjCRedundantCallWithLiteral);
2248 }
2249
2250 /// \brief Diagnose use of %s directive in an NSString which is being passed
2251 /// as formatting string to formatting method.
2252 static void
DiagnoseCStringFormatDirectiveInObjCAPI(Sema & S,ObjCMethodDecl * Method,Selector Sel,Expr ** Args,unsigned NumArgs)2253 DiagnoseCStringFormatDirectiveInObjCAPI(Sema &S,
2254 ObjCMethodDecl *Method,
2255 Selector Sel,
2256 Expr **Args, unsigned NumArgs) {
2257 unsigned Idx = 0;
2258 bool Format = false;
2259 ObjCStringFormatFamily SFFamily = Sel.getStringFormatFamily();
2260 if (SFFamily == ObjCStringFormatFamily::SFF_NSString) {
2261 Idx = 0;
2262 Format = true;
2263 }
2264 else if (Method) {
2265 for (const auto *I : Method->specific_attrs<FormatAttr>()) {
2266 if (S.GetFormatNSStringIdx(I, Idx)) {
2267 Format = true;
2268 break;
2269 }
2270 }
2271 }
2272 if (!Format || NumArgs <= Idx)
2273 return;
2274
2275 Expr *FormatExpr = Args[Idx];
2276 if (ObjCStringLiteral *OSL =
2277 dyn_cast<ObjCStringLiteral>(FormatExpr->IgnoreParenImpCasts())) {
2278 StringLiteral *FormatString = OSL->getString();
2279 if (S.FormatStringHasSArg(FormatString)) {
2280 S.Diag(FormatExpr->getExprLoc(), diag::warn_objc_cdirective_format_string)
2281 << "%s" << 0 << 0;
2282 if (Method)
2283 S.Diag(Method->getLocation(), diag::note_method_declared_at)
2284 << Method->getDeclName();
2285 }
2286 }
2287 }
2288
2289 /// \brief Build an Objective-C class message expression.
2290 ///
2291 /// This routine takes care of both normal class messages and
2292 /// class messages to the superclass.
2293 ///
2294 /// \param ReceiverTypeInfo Type source information that describes the
2295 /// receiver of this message. This may be NULL, in which case we are
2296 /// sending to the superclass and \p SuperLoc must be a valid source
2297 /// location.
2298
2299 /// \param ReceiverType The type of the object receiving the
2300 /// message. When \p ReceiverTypeInfo is non-NULL, this is the same
2301 /// type as that refers to. For a superclass send, this is the type of
2302 /// the superclass.
2303 ///
2304 /// \param SuperLoc The location of the "super" keyword in a
2305 /// superclass message.
2306 ///
2307 /// \param Sel The selector to which the message is being sent.
2308 ///
2309 /// \param Method The method that this class message is invoking, if
2310 /// already known.
2311 ///
2312 /// \param LBracLoc The location of the opening square bracket ']'.
2313 ///
2314 /// \param RBracLoc The location of the closing square bracket ']'.
2315 ///
2316 /// \param ArgsIn The message arguments.
BuildClassMessage(TypeSourceInfo * ReceiverTypeInfo,QualType ReceiverType,SourceLocation SuperLoc,Selector Sel,ObjCMethodDecl * Method,SourceLocation LBracLoc,ArrayRef<SourceLocation> SelectorLocs,SourceLocation RBracLoc,MultiExprArg ArgsIn,bool isImplicit)2317 ExprResult Sema::BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo,
2318 QualType ReceiverType,
2319 SourceLocation SuperLoc,
2320 Selector Sel,
2321 ObjCMethodDecl *Method,
2322 SourceLocation LBracLoc,
2323 ArrayRef<SourceLocation> SelectorLocs,
2324 SourceLocation RBracLoc,
2325 MultiExprArg ArgsIn,
2326 bool isImplicit) {
2327 SourceLocation Loc = SuperLoc.isValid()? SuperLoc
2328 : ReceiverTypeInfo->getTypeLoc().getSourceRange().getBegin();
2329 if (LBracLoc.isInvalid()) {
2330 Diag(Loc, diag::err_missing_open_square_message_send)
2331 << FixItHint::CreateInsertion(Loc, "[");
2332 LBracLoc = Loc;
2333 }
2334 SourceLocation SelLoc;
2335 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2336 SelLoc = SelectorLocs.front();
2337 else
2338 SelLoc = Loc;
2339
2340 if (ReceiverType->isDependentType()) {
2341 // If the receiver type is dependent, we can't type-check anything
2342 // at this point. Build a dependent expression.
2343 unsigned NumArgs = ArgsIn.size();
2344 Expr **Args = ArgsIn.data();
2345 assert(SuperLoc.isInvalid() && "Message to super with dependent type");
2346 return ObjCMessageExpr::Create(
2347 Context, ReceiverType, VK_RValue, LBracLoc, ReceiverTypeInfo, Sel,
2348 SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs), RBracLoc,
2349 isImplicit);
2350 }
2351
2352 // Find the class to which we are sending this message.
2353 ObjCInterfaceDecl *Class = nullptr;
2354 const ObjCObjectType *ClassType = ReceiverType->getAs<ObjCObjectType>();
2355 if (!ClassType || !(Class = ClassType->getInterface())) {
2356 Diag(Loc, diag::err_invalid_receiver_class_message)
2357 << ReceiverType;
2358 return ExprError();
2359 }
2360 assert(Class && "We don't know which class we're messaging?");
2361 // objc++ diagnoses during typename annotation.
2362 if (!getLangOpts().CPlusPlus)
2363 (void)DiagnoseUseOfDecl(Class, SelLoc);
2364 // Find the method we are messaging.
2365 if (!Method) {
2366 SourceRange TypeRange
2367 = SuperLoc.isValid()? SourceRange(SuperLoc)
2368 : ReceiverTypeInfo->getTypeLoc().getSourceRange();
2369 if (RequireCompleteType(Loc, Context.getObjCInterfaceType(Class),
2370 (getLangOpts().ObjCAutoRefCount
2371 ? diag::err_arc_receiver_forward_class
2372 : diag::warn_receiver_forward_class),
2373 TypeRange)) {
2374 // A forward class used in messaging is treated as a 'Class'
2375 Method = LookupFactoryMethodInGlobalPool(Sel,
2376 SourceRange(LBracLoc, RBracLoc));
2377 if (Method && !getLangOpts().ObjCAutoRefCount)
2378 Diag(Method->getLocation(), diag::note_method_sent_forward_class)
2379 << Method->getDeclName();
2380 }
2381 if (!Method)
2382 Method = Class->lookupClassMethod(Sel);
2383
2384 // If we have an implementation in scope, check "private" methods.
2385 if (!Method)
2386 Method = Class->lookupPrivateClassMethod(Sel);
2387
2388 if (Method && DiagnoseUseOfDecl(Method, SelLoc))
2389 return ExprError();
2390 }
2391
2392 // Check the argument types and determine the result type.
2393 QualType ReturnType;
2394 ExprValueKind VK = VK_RValue;
2395
2396 unsigned NumArgs = ArgsIn.size();
2397 Expr **Args = ArgsIn.data();
2398 if (CheckMessageArgumentTypes(ReceiverType, MultiExprArg(Args, NumArgs),
2399 Sel, SelectorLocs,
2400 Method, true,
2401 SuperLoc.isValid(), LBracLoc, RBracLoc,
2402 SourceRange(),
2403 ReturnType, VK))
2404 return ExprError();
2405
2406 if (Method && !Method->getReturnType()->isVoidType() &&
2407 RequireCompleteType(LBracLoc, Method->getReturnType(),
2408 diag::err_illegal_message_expr_incomplete_type))
2409 return ExprError();
2410
2411 // Warn about explicit call of +initialize on its own class. But not on 'super'.
2412 if (Method && Method->getMethodFamily() == OMF_initialize) {
2413 if (!SuperLoc.isValid()) {
2414 const ObjCInterfaceDecl *ID =
2415 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext());
2416 if (ID == Class) {
2417 Diag(Loc, diag::warn_direct_initialize_call);
2418 Diag(Method->getLocation(), diag::note_method_declared_at)
2419 << Method->getDeclName();
2420 }
2421 }
2422 else if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2423 // [super initialize] is allowed only within an +initialize implementation
2424 if (CurMeth->getMethodFamily() != OMF_initialize) {
2425 Diag(Loc, diag::warn_direct_super_initialize_call);
2426 Diag(Method->getLocation(), diag::note_method_declared_at)
2427 << Method->getDeclName();
2428 Diag(CurMeth->getLocation(), diag::note_method_declared_at)
2429 << CurMeth->getDeclName();
2430 }
2431 }
2432 }
2433
2434 DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
2435
2436 // Construct the appropriate ObjCMessageExpr.
2437 ObjCMessageExpr *Result;
2438 if (SuperLoc.isValid())
2439 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2440 SuperLoc, /*IsInstanceSuper=*/false,
2441 ReceiverType, Sel, SelectorLocs,
2442 Method, makeArrayRef(Args, NumArgs),
2443 RBracLoc, isImplicit);
2444 else {
2445 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2446 ReceiverTypeInfo, Sel, SelectorLocs,
2447 Method, makeArrayRef(Args, NumArgs),
2448 RBracLoc, isImplicit);
2449 if (!isImplicit)
2450 checkCocoaAPI(*this, Result);
2451 }
2452 return MaybeBindToTemporary(Result);
2453 }
2454
2455 // ActOnClassMessage - used for both unary and keyword messages.
2456 // ArgExprs is optional - if it is present, the number of expressions
2457 // is obtained from Sel.getNumArgs().
ActOnClassMessage(Scope * S,ParsedType Receiver,Selector Sel,SourceLocation LBracLoc,ArrayRef<SourceLocation> SelectorLocs,SourceLocation RBracLoc,MultiExprArg Args)2458 ExprResult Sema::ActOnClassMessage(Scope *S,
2459 ParsedType Receiver,
2460 Selector Sel,
2461 SourceLocation LBracLoc,
2462 ArrayRef<SourceLocation> SelectorLocs,
2463 SourceLocation RBracLoc,
2464 MultiExprArg Args) {
2465 TypeSourceInfo *ReceiverTypeInfo;
2466 QualType ReceiverType = GetTypeFromParser(Receiver, &ReceiverTypeInfo);
2467 if (ReceiverType.isNull())
2468 return ExprError();
2469
2470
2471 if (!ReceiverTypeInfo)
2472 ReceiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType, LBracLoc);
2473
2474 return BuildClassMessage(ReceiverTypeInfo, ReceiverType,
2475 /*SuperLoc=*/SourceLocation(), Sel,
2476 /*Method=*/nullptr, LBracLoc, SelectorLocs, RBracLoc,
2477 Args);
2478 }
2479
BuildInstanceMessageImplicit(Expr * Receiver,QualType ReceiverType,SourceLocation Loc,Selector Sel,ObjCMethodDecl * Method,MultiExprArg Args)2480 ExprResult Sema::BuildInstanceMessageImplicit(Expr *Receiver,
2481 QualType ReceiverType,
2482 SourceLocation Loc,
2483 Selector Sel,
2484 ObjCMethodDecl *Method,
2485 MultiExprArg Args) {
2486 return BuildInstanceMessage(Receiver, ReceiverType,
2487 /*SuperLoc=*/!Receiver ? Loc : SourceLocation(),
2488 Sel, Method, Loc, Loc, Loc, Args,
2489 /*isImplicit=*/true);
2490 }
2491
2492 /// \brief Build an Objective-C instance message expression.
2493 ///
2494 /// This routine takes care of both normal instance messages and
2495 /// instance messages to the superclass instance.
2496 ///
2497 /// \param Receiver The expression that computes the object that will
2498 /// receive this message. This may be empty, in which case we are
2499 /// sending to the superclass instance and \p SuperLoc must be a valid
2500 /// source location.
2501 ///
2502 /// \param ReceiverType The (static) type of the object receiving the
2503 /// message. When a \p Receiver expression is provided, this is the
2504 /// same type as that expression. For a superclass instance send, this
2505 /// is a pointer to the type of the superclass.
2506 ///
2507 /// \param SuperLoc The location of the "super" keyword in a
2508 /// superclass instance message.
2509 ///
2510 /// \param Sel The selector to which the message is being sent.
2511 ///
2512 /// \param Method The method that this instance message is invoking, if
2513 /// already known.
2514 ///
2515 /// \param LBracLoc The location of the opening square bracket ']'.
2516 ///
2517 /// \param RBracLoc The location of the closing square bracket ']'.
2518 ///
2519 /// \param ArgsIn The message arguments.
BuildInstanceMessage(Expr * Receiver,QualType ReceiverType,SourceLocation SuperLoc,Selector Sel,ObjCMethodDecl * Method,SourceLocation LBracLoc,ArrayRef<SourceLocation> SelectorLocs,SourceLocation RBracLoc,MultiExprArg ArgsIn,bool isImplicit)2520 ExprResult Sema::BuildInstanceMessage(Expr *Receiver,
2521 QualType ReceiverType,
2522 SourceLocation SuperLoc,
2523 Selector Sel,
2524 ObjCMethodDecl *Method,
2525 SourceLocation LBracLoc,
2526 ArrayRef<SourceLocation> SelectorLocs,
2527 SourceLocation RBracLoc,
2528 MultiExprArg ArgsIn,
2529 bool isImplicit) {
2530 // The location of the receiver.
2531 SourceLocation Loc = SuperLoc.isValid()? SuperLoc : Receiver->getLocStart();
2532 SourceRange RecRange =
2533 SuperLoc.isValid()? SuperLoc : Receiver->getSourceRange();
2534 SourceLocation SelLoc;
2535 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2536 SelLoc = SelectorLocs.front();
2537 else
2538 SelLoc = Loc;
2539
2540 if (LBracLoc.isInvalid()) {
2541 Diag(Loc, diag::err_missing_open_square_message_send)
2542 << FixItHint::CreateInsertion(Loc, "[");
2543 LBracLoc = Loc;
2544 }
2545
2546 // If we have a receiver expression, perform appropriate promotions
2547 // and determine receiver type.
2548 if (Receiver) {
2549 if (Receiver->hasPlaceholderType()) {
2550 ExprResult Result;
2551 if (Receiver->getType() == Context.UnknownAnyTy)
2552 Result = forceUnknownAnyToType(Receiver, Context.getObjCIdType());
2553 else
2554 Result = CheckPlaceholderExpr(Receiver);
2555 if (Result.isInvalid()) return ExprError();
2556 Receiver = Result.get();
2557 }
2558
2559 if (Receiver->isTypeDependent()) {
2560 // If the receiver is type-dependent, we can't type-check anything
2561 // at this point. Build a dependent expression.
2562 unsigned NumArgs = ArgsIn.size();
2563 Expr **Args = ArgsIn.data();
2564 assert(SuperLoc.isInvalid() && "Message to super with dependent type");
2565 return ObjCMessageExpr::Create(
2566 Context, Context.DependentTy, VK_RValue, LBracLoc, Receiver, Sel,
2567 SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs),
2568 RBracLoc, isImplicit);
2569 }
2570
2571 // If necessary, apply function/array conversion to the receiver.
2572 // C99 6.7.5.3p[7,8].
2573 ExprResult Result = DefaultFunctionArrayLvalueConversion(Receiver);
2574 if (Result.isInvalid())
2575 return ExprError();
2576 Receiver = Result.get();
2577 ReceiverType = Receiver->getType();
2578
2579 // If the receiver is an ObjC pointer, a block pointer, or an
2580 // __attribute__((NSObject)) pointer, we don't need to do any
2581 // special conversion in order to look up a receiver.
2582 if (ReceiverType->isObjCRetainableType()) {
2583 // do nothing
2584 } else if (!getLangOpts().ObjCAutoRefCount &&
2585 !Context.getObjCIdType().isNull() &&
2586 (ReceiverType->isPointerType() ||
2587 ReceiverType->isIntegerType())) {
2588 // Implicitly convert integers and pointers to 'id' but emit a warning.
2589 // But not in ARC.
2590 Diag(Loc, diag::warn_bad_receiver_type)
2591 << ReceiverType
2592 << Receiver->getSourceRange();
2593 if (ReceiverType->isPointerType()) {
2594 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2595 CK_CPointerToObjCPointerCast).get();
2596 } else {
2597 // TODO: specialized warning on null receivers?
2598 bool IsNull = Receiver->isNullPointerConstant(Context,
2599 Expr::NPC_ValueDependentIsNull);
2600 CastKind Kind = IsNull ? CK_NullToPointer : CK_IntegralToPointer;
2601 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2602 Kind).get();
2603 }
2604 ReceiverType = Receiver->getType();
2605 } else if (getLangOpts().CPlusPlus) {
2606 // The receiver must be a complete type.
2607 if (RequireCompleteType(Loc, Receiver->getType(),
2608 diag::err_incomplete_receiver_type))
2609 return ExprError();
2610
2611 ExprResult result = PerformContextuallyConvertToObjCPointer(Receiver);
2612 if (result.isUsable()) {
2613 Receiver = result.get();
2614 ReceiverType = Receiver->getType();
2615 }
2616 }
2617 }
2618
2619 // There's a somewhat weird interaction here where we assume that we
2620 // won't actually have a method unless we also don't need to do some
2621 // of the more detailed type-checking on the receiver.
2622
2623 if (!Method) {
2624 // Handle messages to id and __kindof types (where we use the
2625 // global method pool).
2626 // FIXME: The type bound is currently ignored by lookup in the
2627 // global pool.
2628 const ObjCObjectType *typeBound = nullptr;
2629 bool receiverIsIdLike = ReceiverType->isObjCIdOrObjectKindOfType(Context,
2630 typeBound);
2631 if (receiverIsIdLike || ReceiverType->isBlockPointerType() ||
2632 (Receiver && Context.isObjCNSObjectType(Receiver->getType()))) {
2633 Method = LookupInstanceMethodInGlobalPool(Sel,
2634 SourceRange(LBracLoc, RBracLoc),
2635 receiverIsIdLike);
2636 if (!Method)
2637 Method = LookupFactoryMethodInGlobalPool(Sel,
2638 SourceRange(LBracLoc,RBracLoc),
2639 receiverIsIdLike);
2640 if (Method) {
2641 if (ObjCMethodDecl *BestMethod =
2642 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod()))
2643 Method = BestMethod;
2644 if (!AreMultipleMethodsInGlobalPool(Sel, Method,
2645 SourceRange(LBracLoc, RBracLoc),
2646 receiverIsIdLike)) {
2647 DiagnoseUseOfDecl(Method, SelLoc);
2648 }
2649 }
2650 } else if (ReceiverType->isObjCClassOrClassKindOfType() ||
2651 ReceiverType->isObjCQualifiedClassType()) {
2652 // Handle messages to Class.
2653 // We allow sending a message to a qualified Class ("Class<foo>"), which
2654 // is ok as long as one of the protocols implements the selector (if not,
2655 // warn).
2656 if (!ReceiverType->isObjCClassOrClassKindOfType()) {
2657 const ObjCObjectPointerType *QClassTy
2658 = ReceiverType->getAsObjCQualifiedClassType();
2659 // Search protocols for class methods.
2660 Method = LookupMethodInQualifiedType(Sel, QClassTy, false);
2661 if (!Method) {
2662 Method = LookupMethodInQualifiedType(Sel, QClassTy, true);
2663 // warn if instance method found for a Class message.
2664 if (Method) {
2665 Diag(SelLoc, diag::warn_instance_method_on_class_found)
2666 << Method->getSelector() << Sel;
2667 Diag(Method->getLocation(), diag::note_method_declared_at)
2668 << Method->getDeclName();
2669 }
2670 }
2671 } else {
2672 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2673 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) {
2674 // First check the public methods in the class interface.
2675 Method = ClassDecl->lookupClassMethod(Sel);
2676
2677 if (!Method)
2678 Method = ClassDecl->lookupPrivateClassMethod(Sel);
2679 }
2680 if (Method && DiagnoseUseOfDecl(Method, SelLoc))
2681 return ExprError();
2682 }
2683 if (!Method) {
2684 // If not messaging 'self', look for any factory method named 'Sel'.
2685 if (!Receiver || !isSelfExpr(Receiver)) {
2686 Method = LookupFactoryMethodInGlobalPool(Sel,
2687 SourceRange(LBracLoc, RBracLoc));
2688 if (!Method) {
2689 // If no class (factory) method was found, check if an _instance_
2690 // method of the same name exists in the root class only.
2691 Method = LookupInstanceMethodInGlobalPool(Sel,
2692 SourceRange(LBracLoc, RBracLoc));
2693 if (Method)
2694 if (const ObjCInterfaceDecl *ID =
2695 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext())) {
2696 if (ID->getSuperClass())
2697 Diag(SelLoc, diag::warn_root_inst_method_not_found)
2698 << Sel << SourceRange(LBracLoc, RBracLoc);
2699 }
2700 }
2701 if (Method)
2702 if (ObjCMethodDecl *BestMethod =
2703 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod()))
2704 Method = BestMethod;
2705 }
2706 }
2707 }
2708 } else {
2709 ObjCInterfaceDecl *ClassDecl = nullptr;
2710
2711 // We allow sending a message to a qualified ID ("id<foo>"), which is ok as
2712 // long as one of the protocols implements the selector (if not, warn).
2713 // And as long as message is not deprecated/unavailable (warn if it is).
2714 if (const ObjCObjectPointerType *QIdTy
2715 = ReceiverType->getAsObjCQualifiedIdType()) {
2716 // Search protocols for instance methods.
2717 Method = LookupMethodInQualifiedType(Sel, QIdTy, true);
2718 if (!Method)
2719 Method = LookupMethodInQualifiedType(Sel, QIdTy, false);
2720 if (Method && DiagnoseUseOfDecl(Method, SelLoc))
2721 return ExprError();
2722 } else if (const ObjCObjectPointerType *OCIType
2723 = ReceiverType->getAsObjCInterfacePointerType()) {
2724 // We allow sending a message to a pointer to an interface (an object).
2725 ClassDecl = OCIType->getInterfaceDecl();
2726
2727 // Try to complete the type. Under ARC, this is a hard error from which
2728 // we don't try to recover.
2729 // FIXME: In the non-ARC case, this will still be a hard error if the
2730 // definition is found in a module that's not visible.
2731 const ObjCInterfaceDecl *forwardClass = nullptr;
2732 if (RequireCompleteType(Loc, OCIType->getPointeeType(),
2733 getLangOpts().ObjCAutoRefCount
2734 ? diag::err_arc_receiver_forward_instance
2735 : diag::warn_receiver_forward_instance,
2736 Receiver? Receiver->getSourceRange()
2737 : SourceRange(SuperLoc))) {
2738 if (getLangOpts().ObjCAutoRefCount)
2739 return ExprError();
2740
2741 forwardClass = OCIType->getInterfaceDecl();
2742 Diag(Receiver ? Receiver->getLocStart()
2743 : SuperLoc, diag::note_receiver_is_id);
2744 Method = nullptr;
2745 } else {
2746 Method = ClassDecl->lookupInstanceMethod(Sel);
2747 }
2748
2749 if (!Method)
2750 // Search protocol qualifiers.
2751 Method = LookupMethodInQualifiedType(Sel, OCIType, true);
2752
2753 if (!Method) {
2754 // If we have implementations in scope, check "private" methods.
2755 Method = ClassDecl->lookupPrivateMethod(Sel);
2756
2757 if (!Method && getLangOpts().ObjCAutoRefCount) {
2758 Diag(SelLoc, diag::err_arc_may_not_respond)
2759 << OCIType->getPointeeType() << Sel << RecRange
2760 << SourceRange(SelectorLocs.front(), SelectorLocs.back());
2761 return ExprError();
2762 }
2763
2764 if (!Method && (!Receiver || !isSelfExpr(Receiver))) {
2765 // If we still haven't found a method, look in the global pool. This
2766 // behavior isn't very desirable, however we need it for GCC
2767 // compatibility. FIXME: should we deviate??
2768 if (OCIType->qual_empty()) {
2769 Method = LookupInstanceMethodInGlobalPool(Sel,
2770 SourceRange(LBracLoc, RBracLoc));
2771 if (Method) {
2772 if (auto BestMethod =
2773 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod()))
2774 Method = BestMethod;
2775 AreMultipleMethodsInGlobalPool(Sel, Method,
2776 SourceRange(LBracLoc, RBracLoc),
2777 true);
2778 }
2779 if (Method && !forwardClass)
2780 Diag(SelLoc, diag::warn_maynot_respond)
2781 << OCIType->getInterfaceDecl()->getIdentifier()
2782 << Sel << RecRange;
2783 }
2784 }
2785 }
2786 if (Method && DiagnoseUseOfDecl(Method, SelLoc, forwardClass))
2787 return ExprError();
2788 } else {
2789 // Reject other random receiver types (e.g. structs).
2790 Diag(Loc, diag::err_bad_receiver_type)
2791 << ReceiverType << Receiver->getSourceRange();
2792 return ExprError();
2793 }
2794 }
2795 }
2796
2797 FunctionScopeInfo *DIFunctionScopeInfo =
2798 (Method && Method->getMethodFamily() == OMF_init)
2799 ? getEnclosingFunction() : nullptr;
2800
2801 if (DIFunctionScopeInfo &&
2802 DIFunctionScopeInfo->ObjCIsDesignatedInit &&
2803 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2804 bool isDesignatedInitChain = false;
2805 if (SuperLoc.isValid()) {
2806 if (const ObjCObjectPointerType *
2807 OCIType = ReceiverType->getAsObjCInterfacePointerType()) {
2808 if (const ObjCInterfaceDecl *ID = OCIType->getInterfaceDecl()) {
2809 // Either we know this is a designated initializer or we
2810 // conservatively assume it because we don't know for sure.
2811 if (!ID->declaresOrInheritsDesignatedInitializers() ||
2812 ID->isDesignatedInitializer(Sel)) {
2813 isDesignatedInitChain = true;
2814 DIFunctionScopeInfo->ObjCWarnForNoDesignatedInitChain = false;
2815 }
2816 }
2817 }
2818 }
2819 if (!isDesignatedInitChain) {
2820 const ObjCMethodDecl *InitMethod = nullptr;
2821 bool isDesignated =
2822 getCurMethodDecl()->isDesignatedInitializerForTheInterface(&InitMethod);
2823 assert(isDesignated && InitMethod);
2824 (void)isDesignated;
2825 Diag(SelLoc, SuperLoc.isValid() ?
2826 diag::warn_objc_designated_init_non_designated_init_call :
2827 diag::warn_objc_designated_init_non_super_designated_init_call);
2828 Diag(InitMethod->getLocation(),
2829 diag::note_objc_designated_init_marked_here);
2830 }
2831 }
2832
2833 if (DIFunctionScopeInfo &&
2834 DIFunctionScopeInfo->ObjCIsSecondaryInit &&
2835 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2836 if (SuperLoc.isValid()) {
2837 Diag(SelLoc, diag::warn_objc_secondary_init_super_init_call);
2838 } else {
2839 DIFunctionScopeInfo->ObjCWarnForNoInitDelegation = false;
2840 }
2841 }
2842
2843 // Check the message arguments.
2844 unsigned NumArgs = ArgsIn.size();
2845 Expr **Args = ArgsIn.data();
2846 QualType ReturnType;
2847 ExprValueKind VK = VK_RValue;
2848 bool ClassMessage = (ReceiverType->isObjCClassType() ||
2849 ReceiverType->isObjCQualifiedClassType());
2850 if (CheckMessageArgumentTypes(ReceiverType, MultiExprArg(Args, NumArgs),
2851 Sel, SelectorLocs, Method,
2852 ClassMessage, SuperLoc.isValid(),
2853 LBracLoc, RBracLoc, RecRange, ReturnType, VK))
2854 return ExprError();
2855
2856 if (Method && !Method->getReturnType()->isVoidType() &&
2857 RequireCompleteType(LBracLoc, Method->getReturnType(),
2858 diag::err_illegal_message_expr_incomplete_type))
2859 return ExprError();
2860
2861 // In ARC, forbid the user from sending messages to
2862 // retain/release/autorelease/dealloc/retainCount explicitly.
2863 if (getLangOpts().ObjCAutoRefCount) {
2864 ObjCMethodFamily family =
2865 (Method ? Method->getMethodFamily() : Sel.getMethodFamily());
2866 switch (family) {
2867 case OMF_init:
2868 if (Method)
2869 checkInitMethod(Method, ReceiverType);
2870
2871 case OMF_None:
2872 case OMF_alloc:
2873 case OMF_copy:
2874 case OMF_finalize:
2875 case OMF_mutableCopy:
2876 case OMF_new:
2877 case OMF_self:
2878 case OMF_initialize:
2879 break;
2880
2881 case OMF_dealloc:
2882 case OMF_retain:
2883 case OMF_release:
2884 case OMF_autorelease:
2885 case OMF_retainCount:
2886 Diag(SelLoc, diag::err_arc_illegal_explicit_message)
2887 << Sel << RecRange;
2888 break;
2889
2890 case OMF_performSelector:
2891 if (Method && NumArgs >= 1) {
2892 if (ObjCSelectorExpr *SelExp = dyn_cast<ObjCSelectorExpr>(Args[0])) {
2893 Selector ArgSel = SelExp->getSelector();
2894 ObjCMethodDecl *SelMethod =
2895 LookupInstanceMethodInGlobalPool(ArgSel,
2896 SelExp->getSourceRange());
2897 if (!SelMethod)
2898 SelMethod =
2899 LookupFactoryMethodInGlobalPool(ArgSel,
2900 SelExp->getSourceRange());
2901 if (SelMethod) {
2902 ObjCMethodFamily SelFamily = SelMethod->getMethodFamily();
2903 switch (SelFamily) {
2904 case OMF_alloc:
2905 case OMF_copy:
2906 case OMF_mutableCopy:
2907 case OMF_new:
2908 case OMF_self:
2909 case OMF_init:
2910 // Issue error, unless ns_returns_not_retained.
2911 if (!SelMethod->hasAttr<NSReturnsNotRetainedAttr>()) {
2912 // selector names a +1 method
2913 Diag(SelLoc,
2914 diag::err_arc_perform_selector_retains);
2915 Diag(SelMethod->getLocation(), diag::note_method_declared_at)
2916 << SelMethod->getDeclName();
2917 }
2918 break;
2919 default:
2920 // +0 call. OK. unless ns_returns_retained.
2921 if (SelMethod->hasAttr<NSReturnsRetainedAttr>()) {
2922 // selector names a +1 method
2923 Diag(SelLoc,
2924 diag::err_arc_perform_selector_retains);
2925 Diag(SelMethod->getLocation(), diag::note_method_declared_at)
2926 << SelMethod->getDeclName();
2927 }
2928 break;
2929 }
2930 }
2931 } else {
2932 // error (may leak).
2933 Diag(SelLoc, diag::warn_arc_perform_selector_leaks);
2934 Diag(Args[0]->getExprLoc(), diag::note_used_here);
2935 }
2936 }
2937 break;
2938 }
2939 }
2940
2941 DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
2942
2943 // Construct the appropriate ObjCMessageExpr instance.
2944 ObjCMessageExpr *Result;
2945 if (SuperLoc.isValid())
2946 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2947 SuperLoc, /*IsInstanceSuper=*/true,
2948 ReceiverType, Sel, SelectorLocs, Method,
2949 makeArrayRef(Args, NumArgs), RBracLoc,
2950 isImplicit);
2951 else {
2952 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2953 Receiver, Sel, SelectorLocs, Method,
2954 makeArrayRef(Args, NumArgs), RBracLoc,
2955 isImplicit);
2956 if (!isImplicit)
2957 checkCocoaAPI(*this, Result);
2958 }
2959
2960 if (getLangOpts().ObjCAutoRefCount) {
2961 // In ARC, annotate delegate init calls.
2962 if (Result->getMethodFamily() == OMF_init &&
2963 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2964 // Only consider init calls *directly* in init implementations,
2965 // not within blocks.
2966 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(CurContext);
2967 if (method && method->getMethodFamily() == OMF_init) {
2968 // The implicit assignment to self means we also don't want to
2969 // consume the result.
2970 Result->setDelegateInitCall(true);
2971 return Result;
2972 }
2973 }
2974
2975 // In ARC, check for message sends which are likely to introduce
2976 // retain cycles.
2977 checkRetainCycles(Result);
2978
2979 if (!isImplicit && Method) {
2980 if (const ObjCPropertyDecl *Prop = Method->findPropertyDecl()) {
2981 bool IsWeak =
2982 Prop->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak;
2983 if (!IsWeak && Sel.isUnarySelector())
2984 IsWeak = ReturnType.getObjCLifetime() & Qualifiers::OCL_Weak;
2985 if (IsWeak &&
2986 !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, LBracLoc))
2987 getCurFunction()->recordUseOfWeak(Result, Prop);
2988 }
2989 }
2990 }
2991
2992 CheckObjCCircularContainer(Result);
2993
2994 return MaybeBindToTemporary(Result);
2995 }
2996
RemoveSelectorFromWarningCache(Sema & S,Expr * Arg)2997 static void RemoveSelectorFromWarningCache(Sema &S, Expr* Arg) {
2998 if (ObjCSelectorExpr *OSE =
2999 dyn_cast<ObjCSelectorExpr>(Arg->IgnoreParenCasts())) {
3000 Selector Sel = OSE->getSelector();
3001 SourceLocation Loc = OSE->getAtLoc();
3002 auto Pos = S.ReferencedSelectors.find(Sel);
3003 if (Pos != S.ReferencedSelectors.end() && Pos->second == Loc)
3004 S.ReferencedSelectors.erase(Pos);
3005 }
3006 }
3007
3008 // ActOnInstanceMessage - used for both unary and keyword messages.
3009 // ArgExprs is optional - if it is present, the number of expressions
3010 // is obtained from Sel.getNumArgs().
ActOnInstanceMessage(Scope * S,Expr * Receiver,Selector Sel,SourceLocation LBracLoc,ArrayRef<SourceLocation> SelectorLocs,SourceLocation RBracLoc,MultiExprArg Args)3011 ExprResult Sema::ActOnInstanceMessage(Scope *S,
3012 Expr *Receiver,
3013 Selector Sel,
3014 SourceLocation LBracLoc,
3015 ArrayRef<SourceLocation> SelectorLocs,
3016 SourceLocation RBracLoc,
3017 MultiExprArg Args) {
3018 if (!Receiver)
3019 return ExprError();
3020
3021 // A ParenListExpr can show up while doing error recovery with invalid code.
3022 if (isa<ParenListExpr>(Receiver)) {
3023 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Receiver);
3024 if (Result.isInvalid()) return ExprError();
3025 Receiver = Result.get();
3026 }
3027
3028 if (RespondsToSelectorSel.isNull()) {
3029 IdentifierInfo *SelectorId = &Context.Idents.get("respondsToSelector");
3030 RespondsToSelectorSel = Context.Selectors.getUnarySelector(SelectorId);
3031 }
3032 if (Sel == RespondsToSelectorSel)
3033 RemoveSelectorFromWarningCache(*this, Args[0]);
3034
3035 return BuildInstanceMessage(Receiver, Receiver->getType(),
3036 /*SuperLoc=*/SourceLocation(), Sel,
3037 /*Method=*/nullptr, LBracLoc, SelectorLocs,
3038 RBracLoc, Args);
3039 }
3040
3041 enum ARCConversionTypeClass {
3042 /// int, void, struct A
3043 ACTC_none,
3044
3045 /// id, void (^)()
3046 ACTC_retainable,
3047
3048 /// id*, id***, void (^*)(),
3049 ACTC_indirectRetainable,
3050
3051 /// void* might be a normal C type, or it might a CF type.
3052 ACTC_voidPtr,
3053
3054 /// struct A*
3055 ACTC_coreFoundation
3056 };
isAnyRetainable(ARCConversionTypeClass ACTC)3057 static bool isAnyRetainable(ARCConversionTypeClass ACTC) {
3058 return (ACTC == ACTC_retainable ||
3059 ACTC == ACTC_coreFoundation ||
3060 ACTC == ACTC_voidPtr);
3061 }
isAnyCLike(ARCConversionTypeClass ACTC)3062 static bool isAnyCLike(ARCConversionTypeClass ACTC) {
3063 return ACTC == ACTC_none ||
3064 ACTC == ACTC_voidPtr ||
3065 ACTC == ACTC_coreFoundation;
3066 }
3067
classifyTypeForARCConversion(QualType type)3068 static ARCConversionTypeClass classifyTypeForARCConversion(QualType type) {
3069 bool isIndirect = false;
3070
3071 // Ignore an outermost reference type.
3072 if (const ReferenceType *ref = type->getAs<ReferenceType>()) {
3073 type = ref->getPointeeType();
3074 isIndirect = true;
3075 }
3076
3077 // Drill through pointers and arrays recursively.
3078 while (true) {
3079 if (const PointerType *ptr = type->getAs<PointerType>()) {
3080 type = ptr->getPointeeType();
3081
3082 // The first level of pointer may be the innermost pointer on a CF type.
3083 if (!isIndirect) {
3084 if (type->isVoidType()) return ACTC_voidPtr;
3085 if (type->isRecordType()) return ACTC_coreFoundation;
3086 }
3087 } else if (const ArrayType *array = type->getAsArrayTypeUnsafe()) {
3088 type = QualType(array->getElementType()->getBaseElementTypeUnsafe(), 0);
3089 } else {
3090 break;
3091 }
3092 isIndirect = true;
3093 }
3094
3095 if (isIndirect) {
3096 if (type->isObjCARCBridgableType())
3097 return ACTC_indirectRetainable;
3098 return ACTC_none;
3099 }
3100
3101 if (type->isObjCARCBridgableType())
3102 return ACTC_retainable;
3103
3104 return ACTC_none;
3105 }
3106
3107 namespace {
3108 /// A result from the cast checker.
3109 enum ACCResult {
3110 /// Cannot be casted.
3111 ACC_invalid,
3112
3113 /// Can be safely retained or not retained.
3114 ACC_bottom,
3115
3116 /// Can be casted at +0.
3117 ACC_plusZero,
3118
3119 /// Can be casted at +1.
3120 ACC_plusOne
3121 };
merge(ACCResult left,ACCResult right)3122 ACCResult merge(ACCResult left, ACCResult right) {
3123 if (left == right) return left;
3124 if (left == ACC_bottom) return right;
3125 if (right == ACC_bottom) return left;
3126 return ACC_invalid;
3127 }
3128
3129 /// A checker which white-lists certain expressions whose conversion
3130 /// to or from retainable type would otherwise be forbidden in ARC.
3131 class ARCCastChecker : public StmtVisitor<ARCCastChecker, ACCResult> {
3132 typedef StmtVisitor<ARCCastChecker, ACCResult> super;
3133
3134 ASTContext &Context;
3135 ARCConversionTypeClass SourceClass;
3136 ARCConversionTypeClass TargetClass;
3137 bool Diagnose;
3138
isCFType(QualType type)3139 static bool isCFType(QualType type) {
3140 // Someday this can use ns_bridged. For now, it has to do this.
3141 return type->isCARCBridgableType();
3142 }
3143
3144 public:
ARCCastChecker(ASTContext & Context,ARCConversionTypeClass source,ARCConversionTypeClass target,bool diagnose)3145 ARCCastChecker(ASTContext &Context, ARCConversionTypeClass source,
3146 ARCConversionTypeClass target, bool diagnose)
3147 : Context(Context), SourceClass(source), TargetClass(target),
3148 Diagnose(diagnose) {}
3149
3150 using super::Visit;
Visit(Expr * e)3151 ACCResult Visit(Expr *e) {
3152 return super::Visit(e->IgnoreParens());
3153 }
3154
VisitStmt(Stmt * s)3155 ACCResult VisitStmt(Stmt *s) {
3156 return ACC_invalid;
3157 }
3158
3159 /// Null pointer constants can be casted however you please.
VisitExpr(Expr * e)3160 ACCResult VisitExpr(Expr *e) {
3161 if (e->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull))
3162 return ACC_bottom;
3163 return ACC_invalid;
3164 }
3165
3166 /// Objective-C string literals can be safely casted.
VisitObjCStringLiteral(ObjCStringLiteral * e)3167 ACCResult VisitObjCStringLiteral(ObjCStringLiteral *e) {
3168 // If we're casting to any retainable type, go ahead. Global
3169 // strings are immune to retains, so this is bottom.
3170 if (isAnyRetainable(TargetClass)) return ACC_bottom;
3171
3172 return ACC_invalid;
3173 }
3174
3175 /// Look through certain implicit and explicit casts.
VisitCastExpr(CastExpr * e)3176 ACCResult VisitCastExpr(CastExpr *e) {
3177 switch (e->getCastKind()) {
3178 case CK_NullToPointer:
3179 return ACC_bottom;
3180
3181 case CK_NoOp:
3182 case CK_LValueToRValue:
3183 case CK_BitCast:
3184 case CK_CPointerToObjCPointerCast:
3185 case CK_BlockPointerToObjCPointerCast:
3186 case CK_AnyPointerToBlockPointerCast:
3187 return Visit(e->getSubExpr());
3188
3189 default:
3190 return ACC_invalid;
3191 }
3192 }
3193
3194 /// Look through unary extension.
VisitUnaryExtension(UnaryOperator * e)3195 ACCResult VisitUnaryExtension(UnaryOperator *e) {
3196 return Visit(e->getSubExpr());
3197 }
3198
3199 /// Ignore the LHS of a comma operator.
VisitBinComma(BinaryOperator * e)3200 ACCResult VisitBinComma(BinaryOperator *e) {
3201 return Visit(e->getRHS());
3202 }
3203
3204 /// Conditional operators are okay if both sides are okay.
VisitConditionalOperator(ConditionalOperator * e)3205 ACCResult VisitConditionalOperator(ConditionalOperator *e) {
3206 ACCResult left = Visit(e->getTrueExpr());
3207 if (left == ACC_invalid) return ACC_invalid;
3208 return merge(left, Visit(e->getFalseExpr()));
3209 }
3210
3211 /// Look through pseudo-objects.
VisitPseudoObjectExpr(PseudoObjectExpr * e)3212 ACCResult VisitPseudoObjectExpr(PseudoObjectExpr *e) {
3213 // If we're getting here, we should always have a result.
3214 return Visit(e->getResultExpr());
3215 }
3216
3217 /// Statement expressions are okay if their result expression is okay.
VisitStmtExpr(StmtExpr * e)3218 ACCResult VisitStmtExpr(StmtExpr *e) {
3219 return Visit(e->getSubStmt()->body_back());
3220 }
3221
3222 /// Some declaration references are okay.
VisitDeclRefExpr(DeclRefExpr * e)3223 ACCResult VisitDeclRefExpr(DeclRefExpr *e) {
3224 VarDecl *var = dyn_cast<VarDecl>(e->getDecl());
3225 // References to global constants are okay.
3226 if (isAnyRetainable(TargetClass) &&
3227 isAnyRetainable(SourceClass) &&
3228 var &&
3229 var->getStorageClass() == SC_Extern &&
3230 var->getType().isConstQualified()) {
3231
3232 // In system headers, they can also be assumed to be immune to retains.
3233 // These are things like 'kCFStringTransformToLatin'.
3234 if (Context.getSourceManager().isInSystemHeader(var->getLocation()))
3235 return ACC_bottom;
3236
3237 return ACC_plusZero;
3238 }
3239
3240 // Nothing else.
3241 return ACC_invalid;
3242 }
3243
3244 /// Some calls are okay.
VisitCallExpr(CallExpr * e)3245 ACCResult VisitCallExpr(CallExpr *e) {
3246 if (FunctionDecl *fn = e->getDirectCallee())
3247 if (ACCResult result = checkCallToFunction(fn))
3248 return result;
3249
3250 return super::VisitCallExpr(e);
3251 }
3252
checkCallToFunction(FunctionDecl * fn)3253 ACCResult checkCallToFunction(FunctionDecl *fn) {
3254 // Require a CF*Ref return type.
3255 if (!isCFType(fn->getReturnType()))
3256 return ACC_invalid;
3257
3258 if (!isAnyRetainable(TargetClass))
3259 return ACC_invalid;
3260
3261 // Honor an explicit 'not retained' attribute.
3262 if (fn->hasAttr<CFReturnsNotRetainedAttr>())
3263 return ACC_plusZero;
3264
3265 // Honor an explicit 'retained' attribute, except that for
3266 // now we're not going to permit implicit handling of +1 results,
3267 // because it's a bit frightening.
3268 if (fn->hasAttr<CFReturnsRetainedAttr>())
3269 return Diagnose ? ACC_plusOne
3270 : ACC_invalid; // ACC_plusOne if we start accepting this
3271
3272 // Recognize this specific builtin function, which is used by CFSTR.
3273 unsigned builtinID = fn->getBuiltinID();
3274 if (builtinID == Builtin::BI__builtin___CFStringMakeConstantString)
3275 return ACC_bottom;
3276
3277 // Otherwise, don't do anything implicit with an unaudited function.
3278 if (!fn->hasAttr<CFAuditedTransferAttr>())
3279 return ACC_invalid;
3280
3281 // Otherwise, it's +0 unless it follows the create convention.
3282 if (ento::coreFoundation::followsCreateRule(fn))
3283 return Diagnose ? ACC_plusOne
3284 : ACC_invalid; // ACC_plusOne if we start accepting this
3285
3286 return ACC_plusZero;
3287 }
3288
VisitObjCMessageExpr(ObjCMessageExpr * e)3289 ACCResult VisitObjCMessageExpr(ObjCMessageExpr *e) {
3290 return checkCallToMethod(e->getMethodDecl());
3291 }
3292
VisitObjCPropertyRefExpr(ObjCPropertyRefExpr * e)3293 ACCResult VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *e) {
3294 ObjCMethodDecl *method;
3295 if (e->isExplicitProperty())
3296 method = e->getExplicitProperty()->getGetterMethodDecl();
3297 else
3298 method = e->getImplicitPropertyGetter();
3299 return checkCallToMethod(method);
3300 }
3301
checkCallToMethod(ObjCMethodDecl * method)3302 ACCResult checkCallToMethod(ObjCMethodDecl *method) {
3303 if (!method) return ACC_invalid;
3304
3305 // Check for message sends to functions returning CF types. We
3306 // just obey the Cocoa conventions with these, even though the
3307 // return type is CF.
3308 if (!isAnyRetainable(TargetClass) || !isCFType(method->getReturnType()))
3309 return ACC_invalid;
3310
3311 // If the method is explicitly marked not-retained, it's +0.
3312 if (method->hasAttr<CFReturnsNotRetainedAttr>())
3313 return ACC_plusZero;
3314
3315 // If the method is explicitly marked as returning retained, or its
3316 // selector follows a +1 Cocoa convention, treat it as +1.
3317 if (method->hasAttr<CFReturnsRetainedAttr>())
3318 return ACC_plusOne;
3319
3320 switch (method->getSelector().getMethodFamily()) {
3321 case OMF_alloc:
3322 case OMF_copy:
3323 case OMF_mutableCopy:
3324 case OMF_new:
3325 return ACC_plusOne;
3326
3327 default:
3328 // Otherwise, treat it as +0.
3329 return ACC_plusZero;
3330 }
3331 }
3332 };
3333 }
3334
isKnownName(StringRef name)3335 bool Sema::isKnownName(StringRef name) {
3336 if (name.empty())
3337 return false;
3338 LookupResult R(*this, &Context.Idents.get(name), SourceLocation(),
3339 Sema::LookupOrdinaryName);
3340 return LookupName(R, TUScope, false);
3341 }
3342
addFixitForObjCARCConversion(Sema & S,DiagnosticBuilder & DiagB,Sema::CheckedConversionKind CCK,SourceLocation afterLParen,QualType castType,Expr * castExpr,Expr * realCast,const char * bridgeKeyword,const char * CFBridgeName)3343 static void addFixitForObjCARCConversion(Sema &S,
3344 DiagnosticBuilder &DiagB,
3345 Sema::CheckedConversionKind CCK,
3346 SourceLocation afterLParen,
3347 QualType castType,
3348 Expr *castExpr,
3349 Expr *realCast,
3350 const char *bridgeKeyword,
3351 const char *CFBridgeName) {
3352 // We handle C-style and implicit casts here.
3353 switch (CCK) {
3354 case Sema::CCK_ImplicitConversion:
3355 case Sema::CCK_CStyleCast:
3356 case Sema::CCK_OtherCast:
3357 break;
3358 case Sema::CCK_FunctionalCast:
3359 return;
3360 }
3361
3362 if (CFBridgeName) {
3363 if (CCK == Sema::CCK_OtherCast) {
3364 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3365 SourceRange range(NCE->getOperatorLoc(),
3366 NCE->getAngleBrackets().getEnd());
3367 SmallString<32> BridgeCall;
3368
3369 SourceManager &SM = S.getSourceManager();
3370 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3371 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3372 BridgeCall += ' ';
3373
3374 BridgeCall += CFBridgeName;
3375 DiagB.AddFixItHint(FixItHint::CreateReplacement(range, BridgeCall));
3376 }
3377 return;
3378 }
3379 Expr *castedE = castExpr;
3380 if (CStyleCastExpr *CCE = dyn_cast<CStyleCastExpr>(castedE))
3381 castedE = CCE->getSubExpr();
3382 castedE = castedE->IgnoreImpCasts();
3383 SourceRange range = castedE->getSourceRange();
3384
3385 SmallString<32> BridgeCall;
3386
3387 SourceManager &SM = S.getSourceManager();
3388 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3389 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3390 BridgeCall += ' ';
3391
3392 BridgeCall += CFBridgeName;
3393
3394 if (isa<ParenExpr>(castedE)) {
3395 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3396 BridgeCall));
3397 } else {
3398 BridgeCall += '(';
3399 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3400 BridgeCall));
3401 DiagB.AddFixItHint(FixItHint::CreateInsertion(
3402 S.getLocForEndOfToken(range.getEnd()),
3403 ")"));
3404 }
3405 return;
3406 }
3407
3408 if (CCK == Sema::CCK_CStyleCast) {
3409 DiagB.AddFixItHint(FixItHint::CreateInsertion(afterLParen, bridgeKeyword));
3410 } else if (CCK == Sema::CCK_OtherCast) {
3411 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3412 std::string castCode = "(";
3413 castCode += bridgeKeyword;
3414 castCode += castType.getAsString();
3415 castCode += ")";
3416 SourceRange Range(NCE->getOperatorLoc(),
3417 NCE->getAngleBrackets().getEnd());
3418 DiagB.AddFixItHint(FixItHint::CreateReplacement(Range, castCode));
3419 }
3420 } else {
3421 std::string castCode = "(";
3422 castCode += bridgeKeyword;
3423 castCode += castType.getAsString();
3424 castCode += ")";
3425 Expr *castedE = castExpr->IgnoreImpCasts();
3426 SourceRange range = castedE->getSourceRange();
3427 if (isa<ParenExpr>(castedE)) {
3428 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3429 castCode));
3430 } else {
3431 castCode += "(";
3432 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3433 castCode));
3434 DiagB.AddFixItHint(FixItHint::CreateInsertion(
3435 S.getLocForEndOfToken(range.getEnd()),
3436 ")"));
3437 }
3438 }
3439 }
3440
3441 template <typename T>
getObjCBridgeAttr(const TypedefType * TD)3442 static inline T *getObjCBridgeAttr(const TypedefType *TD) {
3443 TypedefNameDecl *TDNDecl = TD->getDecl();
3444 QualType QT = TDNDecl->getUnderlyingType();
3445 if (QT->isPointerType()) {
3446 QT = QT->getPointeeType();
3447 if (const RecordType *RT = QT->getAs<RecordType>())
3448 if (RecordDecl *RD = RT->getDecl()->getMostRecentDecl())
3449 return RD->getAttr<T>();
3450 }
3451 return nullptr;
3452 }
3453
ObjCBridgeRelatedAttrFromType(QualType T,TypedefNameDecl * & TDNDecl)3454 static ObjCBridgeRelatedAttr *ObjCBridgeRelatedAttrFromType(QualType T,
3455 TypedefNameDecl *&TDNDecl) {
3456 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3457 TDNDecl = TD->getDecl();
3458 if (ObjCBridgeRelatedAttr *ObjCBAttr =
3459 getObjCBridgeAttr<ObjCBridgeRelatedAttr>(TD))
3460 return ObjCBAttr;
3461 T = TDNDecl->getUnderlyingType();
3462 }
3463 return nullptr;
3464 }
3465
3466 static void
diagnoseObjCARCConversion(Sema & S,SourceRange castRange,QualType castType,ARCConversionTypeClass castACTC,Expr * castExpr,Expr * realCast,ARCConversionTypeClass exprACTC,Sema::CheckedConversionKind CCK)3467 diagnoseObjCARCConversion(Sema &S, SourceRange castRange,
3468 QualType castType, ARCConversionTypeClass castACTC,
3469 Expr *castExpr, Expr *realCast,
3470 ARCConversionTypeClass exprACTC,
3471 Sema::CheckedConversionKind CCK) {
3472 SourceLocation loc =
3473 (castRange.isValid() ? castRange.getBegin() : castExpr->getExprLoc());
3474
3475 if (S.makeUnavailableInSystemHeader(loc,
3476 UnavailableAttr::IR_ARCForbiddenConversion))
3477 return;
3478
3479 QualType castExprType = castExpr->getType();
3480 TypedefNameDecl *TDNDecl = nullptr;
3481 if ((castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable &&
3482 ObjCBridgeRelatedAttrFromType(castType, TDNDecl)) ||
3483 (exprACTC == ACTC_coreFoundation && castACTC == ACTC_retainable &&
3484 ObjCBridgeRelatedAttrFromType(castExprType, TDNDecl)))
3485 return;
3486
3487 unsigned srcKind = 0;
3488 switch (exprACTC) {
3489 case ACTC_none:
3490 case ACTC_coreFoundation:
3491 case ACTC_voidPtr:
3492 srcKind = (castExprType->isPointerType() ? 1 : 0);
3493 break;
3494 case ACTC_retainable:
3495 srcKind = (castExprType->isBlockPointerType() ? 2 : 3);
3496 break;
3497 case ACTC_indirectRetainable:
3498 srcKind = 4;
3499 break;
3500 }
3501
3502 // Check whether this could be fixed with a bridge cast.
3503 SourceLocation afterLParen = S.getLocForEndOfToken(castRange.getBegin());
3504 SourceLocation noteLoc = afterLParen.isValid() ? afterLParen : loc;
3505
3506 // Bridge from an ARC type to a CF type.
3507 if (castACTC == ACTC_retainable && isAnyRetainable(exprACTC)) {
3508
3509 S.Diag(loc, diag::err_arc_cast_requires_bridge)
3510 << unsigned(CCK == Sema::CCK_ImplicitConversion) // cast|implicit
3511 << 2 // of C pointer type
3512 << castExprType
3513 << unsigned(castType->isBlockPointerType()) // to ObjC|block type
3514 << castType
3515 << castRange
3516 << castExpr->getSourceRange();
3517 bool br = S.isKnownName("CFBridgingRelease");
3518 ACCResult CreateRule =
3519 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3520 assert(CreateRule != ACC_bottom && "This cast should already be accepted.");
3521 if (CreateRule != ACC_plusOne)
3522 {
3523 DiagnosticBuilder DiagB =
3524 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3525 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3526
3527 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3528 castType, castExpr, realCast, "__bridge ",
3529 nullptr);
3530 }
3531 if (CreateRule != ACC_plusZero)
3532 {
3533 DiagnosticBuilder DiagB =
3534 (CCK == Sema::CCK_OtherCast && !br) ?
3535 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_transfer) << castExprType :
3536 S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3537 diag::note_arc_bridge_transfer)
3538 << castExprType << br;
3539
3540 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3541 castType, castExpr, realCast, "__bridge_transfer ",
3542 br ? "CFBridgingRelease" : nullptr);
3543 }
3544
3545 return;
3546 }
3547
3548 // Bridge from a CF type to an ARC type.
3549 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC)) {
3550 bool br = S.isKnownName("CFBridgingRetain");
3551 S.Diag(loc, diag::err_arc_cast_requires_bridge)
3552 << unsigned(CCK == Sema::CCK_ImplicitConversion) // cast|implicit
3553 << unsigned(castExprType->isBlockPointerType()) // of ObjC|block type
3554 << castExprType
3555 << 2 // to C pointer type
3556 << castType
3557 << castRange
3558 << castExpr->getSourceRange();
3559 ACCResult CreateRule =
3560 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3561 assert(CreateRule != ACC_bottom && "This cast should already be accepted.");
3562 if (CreateRule != ACC_plusOne)
3563 {
3564 DiagnosticBuilder DiagB =
3565 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3566 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3567 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3568 castType, castExpr, realCast, "__bridge ",
3569 nullptr);
3570 }
3571 if (CreateRule != ACC_plusZero)
3572 {
3573 DiagnosticBuilder DiagB =
3574 (CCK == Sema::CCK_OtherCast && !br) ?
3575 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_retained) << castType :
3576 S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3577 diag::note_arc_bridge_retained)
3578 << castType << br;
3579
3580 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3581 castType, castExpr, realCast, "__bridge_retained ",
3582 br ? "CFBridgingRetain" : nullptr);
3583 }
3584
3585 return;
3586 }
3587
3588 S.Diag(loc, diag::err_arc_mismatched_cast)
3589 << (CCK != Sema::CCK_ImplicitConversion)
3590 << srcKind << castExprType << castType
3591 << castRange << castExpr->getSourceRange();
3592 }
3593
3594 template <typename TB>
CheckObjCBridgeNSCast(Sema & S,QualType castType,Expr * castExpr,bool & HadTheAttribute,bool warn)3595 static bool CheckObjCBridgeNSCast(Sema &S, QualType castType, Expr *castExpr,
3596 bool &HadTheAttribute, bool warn) {
3597 QualType T = castExpr->getType();
3598 HadTheAttribute = false;
3599 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3600 TypedefNameDecl *TDNDecl = TD->getDecl();
3601 if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3602 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3603 HadTheAttribute = true;
3604 if (Parm->isStr("id"))
3605 return true;
3606
3607 NamedDecl *Target = nullptr;
3608 // Check for an existing type with this name.
3609 LookupResult R(S, DeclarationName(Parm), SourceLocation(),
3610 Sema::LookupOrdinaryName);
3611 if (S.LookupName(R, S.TUScope)) {
3612 Target = R.getFoundDecl();
3613 if (Target && isa<ObjCInterfaceDecl>(Target)) {
3614 ObjCInterfaceDecl *ExprClass = cast<ObjCInterfaceDecl>(Target);
3615 if (const ObjCObjectPointerType *InterfacePointerType =
3616 castType->getAsObjCInterfacePointerType()) {
3617 ObjCInterfaceDecl *CastClass
3618 = InterfacePointerType->getObjectType()->getInterface();
3619 if ((CastClass == ExprClass) ||
3620 (CastClass && CastClass->isSuperClassOf(ExprClass)))
3621 return true;
3622 if (warn)
3623 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge)
3624 << T << Target->getName() << castType->getPointeeType();
3625 return false;
3626 } else if (castType->isObjCIdType() ||
3627 (S.Context.ObjCObjectAdoptsQTypeProtocols(
3628 castType, ExprClass)))
3629 // ok to cast to 'id'.
3630 // casting to id<p-list> is ok if bridge type adopts all of
3631 // p-list protocols.
3632 return true;
3633 else {
3634 if (warn) {
3635 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge)
3636 << T << Target->getName() << castType;
3637 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3638 S.Diag(Target->getLocStart(), diag::note_declared_at);
3639 }
3640 return false;
3641 }
3642 }
3643 } else if (!castType->isObjCIdType()) {
3644 S.Diag(castExpr->getLocStart(), diag::err_objc_cf_bridged_not_interface)
3645 << castExpr->getType() << Parm;
3646 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3647 if (Target)
3648 S.Diag(Target->getLocStart(), diag::note_declared_at);
3649 }
3650 return true;
3651 }
3652 return false;
3653 }
3654 T = TDNDecl->getUnderlyingType();
3655 }
3656 return true;
3657 }
3658
3659 template <typename TB>
CheckObjCBridgeCFCast(Sema & S,QualType castType,Expr * castExpr,bool & HadTheAttribute,bool warn)3660 static bool CheckObjCBridgeCFCast(Sema &S, QualType castType, Expr *castExpr,
3661 bool &HadTheAttribute, bool warn) {
3662 QualType T = castType;
3663 HadTheAttribute = false;
3664 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3665 TypedefNameDecl *TDNDecl = TD->getDecl();
3666 if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3667 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3668 HadTheAttribute = true;
3669 if (Parm->isStr("id"))
3670 return true;
3671
3672 NamedDecl *Target = nullptr;
3673 // Check for an existing type with this name.
3674 LookupResult R(S, DeclarationName(Parm), SourceLocation(),
3675 Sema::LookupOrdinaryName);
3676 if (S.LookupName(R, S.TUScope)) {
3677 Target = R.getFoundDecl();
3678 if (Target && isa<ObjCInterfaceDecl>(Target)) {
3679 ObjCInterfaceDecl *CastClass = cast<ObjCInterfaceDecl>(Target);
3680 if (const ObjCObjectPointerType *InterfacePointerType =
3681 castExpr->getType()->getAsObjCInterfacePointerType()) {
3682 ObjCInterfaceDecl *ExprClass
3683 = InterfacePointerType->getObjectType()->getInterface();
3684 if ((CastClass == ExprClass) ||
3685 (ExprClass && CastClass->isSuperClassOf(ExprClass)))
3686 return true;
3687 if (warn) {
3688 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge_to_cf)
3689 << castExpr->getType()->getPointeeType() << T;
3690 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3691 }
3692 return false;
3693 } else if (castExpr->getType()->isObjCIdType() ||
3694 (S.Context.QIdProtocolsAdoptObjCObjectProtocols(
3695 castExpr->getType(), CastClass)))
3696 // ok to cast an 'id' expression to a CFtype.
3697 // ok to cast an 'id<plist>' expression to CFtype provided plist
3698 // adopts all of CFtype's ObjetiveC's class plist.
3699 return true;
3700 else {
3701 if (warn) {
3702 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge_to_cf)
3703 << castExpr->getType() << castType;
3704 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3705 S.Diag(Target->getLocStart(), diag::note_declared_at);
3706 }
3707 return false;
3708 }
3709 }
3710 }
3711 S.Diag(castExpr->getLocStart(), diag::err_objc_ns_bridged_invalid_cfobject)
3712 << castExpr->getType() << castType;
3713 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3714 if (Target)
3715 S.Diag(Target->getLocStart(), diag::note_declared_at);
3716 return true;
3717 }
3718 return false;
3719 }
3720 T = TDNDecl->getUnderlyingType();
3721 }
3722 return true;
3723 }
3724
CheckTollFreeBridgeCast(QualType castType,Expr * castExpr)3725 void Sema::CheckTollFreeBridgeCast(QualType castType, Expr *castExpr) {
3726 if (!getLangOpts().ObjC1)
3727 return;
3728 // warn in presence of __bridge casting to or from a toll free bridge cast.
3729 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExpr->getType());
3730 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType);
3731 if (castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) {
3732 bool HasObjCBridgeAttr;
3733 bool ObjCBridgeAttrWillNotWarn =
3734 CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3735 false);
3736 if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
3737 return;
3738 bool HasObjCBridgeMutableAttr;
3739 bool ObjCBridgeMutableAttrWillNotWarn =
3740 CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3741 HasObjCBridgeMutableAttr, false);
3742 if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
3743 return;
3744
3745 if (HasObjCBridgeAttr)
3746 CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3747 true);
3748 else if (HasObjCBridgeMutableAttr)
3749 CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3750 HasObjCBridgeMutableAttr, true);
3751 }
3752 else if (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable) {
3753 bool HasObjCBridgeAttr;
3754 bool ObjCBridgeAttrWillNotWarn =
3755 CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3756 false);
3757 if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
3758 return;
3759 bool HasObjCBridgeMutableAttr;
3760 bool ObjCBridgeMutableAttrWillNotWarn =
3761 CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3762 HasObjCBridgeMutableAttr, false);
3763 if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
3764 return;
3765
3766 if (HasObjCBridgeAttr)
3767 CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3768 true);
3769 else if (HasObjCBridgeMutableAttr)
3770 CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3771 HasObjCBridgeMutableAttr, true);
3772 }
3773 }
3774
CheckObjCBridgeRelatedCast(QualType castType,Expr * castExpr)3775 void Sema::CheckObjCBridgeRelatedCast(QualType castType, Expr *castExpr) {
3776 QualType SrcType = castExpr->getType();
3777 if (ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(castExpr)) {
3778 if (PRE->isExplicitProperty()) {
3779 if (ObjCPropertyDecl *PDecl = PRE->getExplicitProperty())
3780 SrcType = PDecl->getType();
3781 }
3782 else if (PRE->isImplicitProperty()) {
3783 if (ObjCMethodDecl *Getter = PRE->getImplicitPropertyGetter())
3784 SrcType = Getter->getReturnType();
3785
3786 }
3787 }
3788
3789 ARCConversionTypeClass srcExprACTC = classifyTypeForARCConversion(SrcType);
3790 ARCConversionTypeClass castExprACTC = classifyTypeForARCConversion(castType);
3791 if (srcExprACTC != ACTC_retainable || castExprACTC != ACTC_coreFoundation)
3792 return;
3793 CheckObjCBridgeRelatedConversions(castExpr->getLocStart(),
3794 castType, SrcType, castExpr);
3795 return;
3796 }
3797
CheckTollFreeBridgeStaticCast(QualType castType,Expr * castExpr,CastKind & Kind)3798 bool Sema::CheckTollFreeBridgeStaticCast(QualType castType, Expr *castExpr,
3799 CastKind &Kind) {
3800 if (!getLangOpts().ObjC1)
3801 return false;
3802 ARCConversionTypeClass exprACTC =
3803 classifyTypeForARCConversion(castExpr->getType());
3804 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType);
3805 if ((castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) ||
3806 (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable)) {
3807 CheckTollFreeBridgeCast(castType, castExpr);
3808 Kind = (castACTC == ACTC_coreFoundation) ? CK_BitCast
3809 : CK_CPointerToObjCPointerCast;
3810 return true;
3811 }
3812 return false;
3813 }
3814
checkObjCBridgeRelatedComponents(SourceLocation Loc,QualType DestType,QualType SrcType,ObjCInterfaceDecl * & RelatedClass,ObjCMethodDecl * & ClassMethod,ObjCMethodDecl * & InstanceMethod,TypedefNameDecl * & TDNDecl,bool CfToNs)3815 bool Sema::checkObjCBridgeRelatedComponents(SourceLocation Loc,
3816 QualType DestType, QualType SrcType,
3817 ObjCInterfaceDecl *&RelatedClass,
3818 ObjCMethodDecl *&ClassMethod,
3819 ObjCMethodDecl *&InstanceMethod,
3820 TypedefNameDecl *&TDNDecl,
3821 bool CfToNs) {
3822 QualType T = CfToNs ? SrcType : DestType;
3823 ObjCBridgeRelatedAttr *ObjCBAttr = ObjCBridgeRelatedAttrFromType(T, TDNDecl);
3824 if (!ObjCBAttr)
3825 return false;
3826
3827 IdentifierInfo *RCId = ObjCBAttr->getRelatedClass();
3828 IdentifierInfo *CMId = ObjCBAttr->getClassMethod();
3829 IdentifierInfo *IMId = ObjCBAttr->getInstanceMethod();
3830 if (!RCId)
3831 return false;
3832 NamedDecl *Target = nullptr;
3833 // Check for an existing type with this name.
3834 LookupResult R(*this, DeclarationName(RCId), SourceLocation(),
3835 Sema::LookupOrdinaryName);
3836 if (!LookupName(R, TUScope)) {
3837 Diag(Loc, diag::err_objc_bridged_related_invalid_class) << RCId
3838 << SrcType << DestType;
3839 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3840 return false;
3841 }
3842 Target = R.getFoundDecl();
3843 if (Target && isa<ObjCInterfaceDecl>(Target))
3844 RelatedClass = cast<ObjCInterfaceDecl>(Target);
3845 else {
3846 Diag(Loc, diag::err_objc_bridged_related_invalid_class_name) << RCId
3847 << SrcType << DestType;
3848 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3849 if (Target)
3850 Diag(Target->getLocStart(), diag::note_declared_at);
3851 return false;
3852 }
3853
3854 // Check for an existing class method with the given selector name.
3855 if (CfToNs && CMId) {
3856 Selector Sel = Context.Selectors.getUnarySelector(CMId);
3857 ClassMethod = RelatedClass->lookupMethod(Sel, false);
3858 if (!ClassMethod) {
3859 Diag(Loc, diag::err_objc_bridged_related_known_method)
3860 << SrcType << DestType << Sel << false;
3861 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3862 return false;
3863 }
3864 }
3865
3866 // Check for an existing instance method with the given selector name.
3867 if (!CfToNs && IMId) {
3868 Selector Sel = Context.Selectors.getNullarySelector(IMId);
3869 InstanceMethod = RelatedClass->lookupMethod(Sel, true);
3870 if (!InstanceMethod) {
3871 Diag(Loc, diag::err_objc_bridged_related_known_method)
3872 << SrcType << DestType << Sel << true;
3873 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3874 return false;
3875 }
3876 }
3877 return true;
3878 }
3879
3880 bool
CheckObjCBridgeRelatedConversions(SourceLocation Loc,QualType DestType,QualType SrcType,Expr * & SrcExpr)3881 Sema::CheckObjCBridgeRelatedConversions(SourceLocation Loc,
3882 QualType DestType, QualType SrcType,
3883 Expr *&SrcExpr) {
3884 ARCConversionTypeClass rhsExprACTC = classifyTypeForARCConversion(SrcType);
3885 ARCConversionTypeClass lhsExprACTC = classifyTypeForARCConversion(DestType);
3886 bool CfToNs = (rhsExprACTC == ACTC_coreFoundation && lhsExprACTC == ACTC_retainable);
3887 bool NsToCf = (rhsExprACTC == ACTC_retainable && lhsExprACTC == ACTC_coreFoundation);
3888 if (!CfToNs && !NsToCf)
3889 return false;
3890
3891 ObjCInterfaceDecl *RelatedClass;
3892 ObjCMethodDecl *ClassMethod = nullptr;
3893 ObjCMethodDecl *InstanceMethod = nullptr;
3894 TypedefNameDecl *TDNDecl = nullptr;
3895 if (!checkObjCBridgeRelatedComponents(Loc, DestType, SrcType, RelatedClass,
3896 ClassMethod, InstanceMethod, TDNDecl, CfToNs))
3897 return false;
3898
3899 if (CfToNs) {
3900 // Implicit conversion from CF to ObjC object is needed.
3901 if (ClassMethod) {
3902 std::string ExpressionString = "[";
3903 ExpressionString += RelatedClass->getNameAsString();
3904 ExpressionString += " ";
3905 ExpressionString += ClassMethod->getSelector().getAsString();
3906 SourceLocation SrcExprEndLoc = getLocForEndOfToken(SrcExpr->getLocEnd());
3907 // Provide a fixit: [RelatedClass ClassMethod SrcExpr]
3908 Diag(Loc, diag::err_objc_bridged_related_known_method)
3909 << SrcType << DestType << ClassMethod->getSelector() << false
3910 << FixItHint::CreateInsertion(SrcExpr->getLocStart(), ExpressionString)
3911 << FixItHint::CreateInsertion(SrcExprEndLoc, "]");
3912 Diag(RelatedClass->getLocStart(), diag::note_declared_at);
3913 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3914
3915 QualType receiverType =
3916 Context.getObjCInterfaceType(RelatedClass);
3917 // Argument.
3918 Expr *args[] = { SrcExpr };
3919 ExprResult msg = BuildClassMessageImplicit(receiverType, false,
3920 ClassMethod->getLocation(),
3921 ClassMethod->getSelector(), ClassMethod,
3922 MultiExprArg(args, 1));
3923 SrcExpr = msg.get();
3924 return true;
3925 }
3926 }
3927 else {
3928 // Implicit conversion from ObjC type to CF object is needed.
3929 if (InstanceMethod) {
3930 std::string ExpressionString;
3931 SourceLocation SrcExprEndLoc = getLocForEndOfToken(SrcExpr->getLocEnd());
3932 if (InstanceMethod->isPropertyAccessor())
3933 if (const ObjCPropertyDecl *PDecl = InstanceMethod->findPropertyDecl()) {
3934 // fixit: ObjectExpr.propertyname when it is aproperty accessor.
3935 ExpressionString = ".";
3936 ExpressionString += PDecl->getNameAsString();
3937 Diag(Loc, diag::err_objc_bridged_related_known_method)
3938 << SrcType << DestType << InstanceMethod->getSelector() << true
3939 << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
3940 }
3941 if (ExpressionString.empty()) {
3942 // Provide a fixit: [ObjectExpr InstanceMethod]
3943 ExpressionString = " ";
3944 ExpressionString += InstanceMethod->getSelector().getAsString();
3945 ExpressionString += "]";
3946
3947 Diag(Loc, diag::err_objc_bridged_related_known_method)
3948 << SrcType << DestType << InstanceMethod->getSelector() << true
3949 << FixItHint::CreateInsertion(SrcExpr->getLocStart(), "[")
3950 << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
3951 }
3952 Diag(RelatedClass->getLocStart(), diag::note_declared_at);
3953 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3954
3955 ExprResult msg =
3956 BuildInstanceMessageImplicit(SrcExpr, SrcType,
3957 InstanceMethod->getLocation(),
3958 InstanceMethod->getSelector(),
3959 InstanceMethod, None);
3960 SrcExpr = msg.get();
3961 return true;
3962 }
3963 }
3964 return false;
3965 }
3966
3967 Sema::ARCConversionResult
CheckObjCARCConversion(SourceRange castRange,QualType castType,Expr * & castExpr,CheckedConversionKind CCK,bool DiagnoseCFAudited,BinaryOperatorKind Opc)3968 Sema::CheckObjCARCConversion(SourceRange castRange, QualType castType,
3969 Expr *&castExpr, CheckedConversionKind CCK,
3970 bool DiagnoseCFAudited,
3971 BinaryOperatorKind Opc) {
3972 QualType castExprType = castExpr->getType();
3973
3974 // For the purposes of the classification, we assume reference types
3975 // will bind to temporaries.
3976 QualType effCastType = castType;
3977 if (const ReferenceType *ref = castType->getAs<ReferenceType>())
3978 effCastType = ref->getPointeeType();
3979
3980 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExprType);
3981 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(effCastType);
3982 if (exprACTC == castACTC) {
3983 // check for viablity and report error if casting an rvalue to a
3984 // life-time qualifier.
3985 if ((castACTC == ACTC_retainable) &&
3986 (CCK == CCK_CStyleCast || CCK == CCK_OtherCast) &&
3987 (castType != castExprType)) {
3988 const Type *DT = castType.getTypePtr();
3989 QualType QDT = castType;
3990 // We desugar some types but not others. We ignore those
3991 // that cannot happen in a cast; i.e. auto, and those which
3992 // should not be de-sugared; i.e typedef.
3993 if (const ParenType *PT = dyn_cast<ParenType>(DT))
3994 QDT = PT->desugar();
3995 else if (const TypeOfType *TP = dyn_cast<TypeOfType>(DT))
3996 QDT = TP->desugar();
3997 else if (const AttributedType *AT = dyn_cast<AttributedType>(DT))
3998 QDT = AT->desugar();
3999 if (QDT != castType &&
4000 QDT.getObjCLifetime() != Qualifiers::OCL_None) {
4001 SourceLocation loc =
4002 (castRange.isValid() ? castRange.getBegin()
4003 : castExpr->getExprLoc());
4004 Diag(loc, diag::err_arc_nolifetime_behavior);
4005 }
4006 }
4007 return ACR_okay;
4008 }
4009
4010 if (isAnyCLike(exprACTC) && isAnyCLike(castACTC)) return ACR_okay;
4011
4012 // Allow all of these types to be cast to integer types (but not
4013 // vice-versa).
4014 if (castACTC == ACTC_none && castType->isIntegralType(Context))
4015 return ACR_okay;
4016
4017 // Allow casts between pointers to lifetime types (e.g., __strong id*)
4018 // and pointers to void (e.g., cv void *). Casting from void* to lifetime*
4019 // must be explicit.
4020 if (exprACTC == ACTC_indirectRetainable && castACTC == ACTC_voidPtr)
4021 return ACR_okay;
4022 if (castACTC == ACTC_indirectRetainable && exprACTC == ACTC_voidPtr &&
4023 CCK != CCK_ImplicitConversion)
4024 return ACR_okay;
4025
4026 switch (ARCCastChecker(Context, exprACTC, castACTC, false).Visit(castExpr)) {
4027 // For invalid casts, fall through.
4028 case ACC_invalid:
4029 break;
4030
4031 // Do nothing for both bottom and +0.
4032 case ACC_bottom:
4033 case ACC_plusZero:
4034 return ACR_okay;
4035
4036 // If the result is +1, consume it here.
4037 case ACC_plusOne:
4038 castExpr = ImplicitCastExpr::Create(Context, castExpr->getType(),
4039 CK_ARCConsumeObject, castExpr,
4040 nullptr, VK_RValue);
4041 ExprNeedsCleanups = true;
4042 return ACR_okay;
4043 }
4044
4045 // If this is a non-implicit cast from id or block type to a
4046 // CoreFoundation type, delay complaining in case the cast is used
4047 // in an acceptable context.
4048 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC) &&
4049 CCK != CCK_ImplicitConversion)
4050 return ACR_unbridged;
4051
4052 // Do not issue bridge cast" diagnostic when implicit casting a cstring
4053 // to 'NSString *'. Let caller issue a normal mismatched diagnostic with
4054 // suitable fix-it.
4055 if (castACTC == ACTC_retainable && exprACTC == ACTC_none &&
4056 ConversionToObjCStringLiteralCheck(castType, castExpr))
4057 return ACR_okay;
4058
4059 // Do not issue "bridge cast" diagnostic when implicit casting
4060 // a retainable object to a CF type parameter belonging to an audited
4061 // CF API function. Let caller issue a normal type mismatched diagnostic
4062 // instead.
4063 if (!DiagnoseCFAudited || exprACTC != ACTC_retainable ||
4064 castACTC != ACTC_coreFoundation)
4065 if (!(exprACTC == ACTC_voidPtr && castACTC == ACTC_retainable &&
4066 (Opc == BO_NE || Opc == BO_EQ)))
4067 diagnoseObjCARCConversion(*this, castRange, castType, castACTC,
4068 castExpr, castExpr, exprACTC, CCK);
4069 return ACR_okay;
4070 }
4071
4072 /// Given that we saw an expression with the ARCUnbridgedCastTy
4073 /// placeholder type, complain bitterly.
diagnoseARCUnbridgedCast(Expr * e)4074 void Sema::diagnoseARCUnbridgedCast(Expr *e) {
4075 // We expect the spurious ImplicitCastExpr to already have been stripped.
4076 assert(!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast));
4077 CastExpr *realCast = cast<CastExpr>(e->IgnoreParens());
4078
4079 SourceRange castRange;
4080 QualType castType;
4081 CheckedConversionKind CCK;
4082
4083 if (CStyleCastExpr *cast = dyn_cast<CStyleCastExpr>(realCast)) {
4084 castRange = SourceRange(cast->getLParenLoc(), cast->getRParenLoc());
4085 castType = cast->getTypeAsWritten();
4086 CCK = CCK_CStyleCast;
4087 } else if (ExplicitCastExpr *cast = dyn_cast<ExplicitCastExpr>(realCast)) {
4088 castRange = cast->getTypeInfoAsWritten()->getTypeLoc().getSourceRange();
4089 castType = cast->getTypeAsWritten();
4090 CCK = CCK_OtherCast;
4091 } else {
4092 castType = cast->getType();
4093 CCK = CCK_ImplicitConversion;
4094 }
4095
4096 ARCConversionTypeClass castACTC =
4097 classifyTypeForARCConversion(castType.getNonReferenceType());
4098
4099 Expr *castExpr = realCast->getSubExpr();
4100 assert(classifyTypeForARCConversion(castExpr->getType()) == ACTC_retainable);
4101
4102 diagnoseObjCARCConversion(*this, castRange, castType, castACTC,
4103 castExpr, realCast, ACTC_retainable, CCK);
4104 }
4105
4106 /// stripARCUnbridgedCast - Given an expression of ARCUnbridgedCast
4107 /// type, remove the placeholder cast.
stripARCUnbridgedCast(Expr * e)4108 Expr *Sema::stripARCUnbridgedCast(Expr *e) {
4109 assert(e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast));
4110
4111 if (ParenExpr *pe = dyn_cast<ParenExpr>(e)) {
4112 Expr *sub = stripARCUnbridgedCast(pe->getSubExpr());
4113 return new (Context) ParenExpr(pe->getLParen(), pe->getRParen(), sub);
4114 } else if (UnaryOperator *uo = dyn_cast<UnaryOperator>(e)) {
4115 assert(uo->getOpcode() == UO_Extension);
4116 Expr *sub = stripARCUnbridgedCast(uo->getSubExpr());
4117 return new (Context) UnaryOperator(sub, UO_Extension, sub->getType(),
4118 sub->getValueKind(), sub->getObjectKind(),
4119 uo->getOperatorLoc());
4120 } else if (GenericSelectionExpr *gse = dyn_cast<GenericSelectionExpr>(e)) {
4121 assert(!gse->isResultDependent());
4122
4123 unsigned n = gse->getNumAssocs();
4124 SmallVector<Expr*, 4> subExprs(n);
4125 SmallVector<TypeSourceInfo*, 4> subTypes(n);
4126 for (unsigned i = 0; i != n; ++i) {
4127 subTypes[i] = gse->getAssocTypeSourceInfo(i);
4128 Expr *sub = gse->getAssocExpr(i);
4129 if (i == gse->getResultIndex())
4130 sub = stripARCUnbridgedCast(sub);
4131 subExprs[i] = sub;
4132 }
4133
4134 return new (Context) GenericSelectionExpr(Context, gse->getGenericLoc(),
4135 gse->getControllingExpr(),
4136 subTypes, subExprs,
4137 gse->getDefaultLoc(),
4138 gse->getRParenLoc(),
4139 gse->containsUnexpandedParameterPack(),
4140 gse->getResultIndex());
4141 } else {
4142 assert(isa<ImplicitCastExpr>(e) && "bad form of unbridged cast!");
4143 return cast<ImplicitCastExpr>(e)->getSubExpr();
4144 }
4145 }
4146
CheckObjCARCUnavailableWeakConversion(QualType castType,QualType exprType)4147 bool Sema::CheckObjCARCUnavailableWeakConversion(QualType castType,
4148 QualType exprType) {
4149 QualType canCastType =
4150 Context.getCanonicalType(castType).getUnqualifiedType();
4151 QualType canExprType =
4152 Context.getCanonicalType(exprType).getUnqualifiedType();
4153 if (isa<ObjCObjectPointerType>(canCastType) &&
4154 castType.getObjCLifetime() == Qualifiers::OCL_Weak &&
4155 canExprType->isObjCObjectPointerType()) {
4156 if (const ObjCObjectPointerType *ObjT =
4157 canExprType->getAs<ObjCObjectPointerType>())
4158 if (const ObjCInterfaceDecl *ObjI = ObjT->getInterfaceDecl())
4159 return !ObjI->isArcWeakrefUnavailable();
4160 }
4161 return true;
4162 }
4163
4164 /// Look for an ObjCReclaimReturnedObject cast and destroy it.
maybeUndoReclaimObject(Expr * e)4165 static Expr *maybeUndoReclaimObject(Expr *e) {
4166 // For now, we just undo operands that are *immediately* reclaim
4167 // expressions, which prevents the vast majority of potential
4168 // problems here. To catch them all, we'd need to rebuild arbitrary
4169 // value-propagating subexpressions --- we can't reliably rebuild
4170 // in-place because of expression sharing.
4171 if (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e))
4172 if (ice->getCastKind() == CK_ARCReclaimReturnedObject)
4173 return ice->getSubExpr();
4174
4175 return e;
4176 }
4177
BuildObjCBridgedCast(SourceLocation LParenLoc,ObjCBridgeCastKind Kind,SourceLocation BridgeKeywordLoc,TypeSourceInfo * TSInfo,Expr * SubExpr)4178 ExprResult Sema::BuildObjCBridgedCast(SourceLocation LParenLoc,
4179 ObjCBridgeCastKind Kind,
4180 SourceLocation BridgeKeywordLoc,
4181 TypeSourceInfo *TSInfo,
4182 Expr *SubExpr) {
4183 ExprResult SubResult = UsualUnaryConversions(SubExpr);
4184 if (SubResult.isInvalid()) return ExprError();
4185 SubExpr = SubResult.get();
4186
4187 QualType T = TSInfo->getType();
4188 QualType FromType = SubExpr->getType();
4189
4190 CastKind CK;
4191
4192 bool MustConsume = false;
4193 if (T->isDependentType() || SubExpr->isTypeDependent()) {
4194 // Okay: we'll build a dependent expression type.
4195 CK = CK_Dependent;
4196 } else if (T->isObjCARCBridgableType() && FromType->isCARCBridgableType()) {
4197 // Casting CF -> id
4198 CK = (T->isBlockPointerType() ? CK_AnyPointerToBlockPointerCast
4199 : CK_CPointerToObjCPointerCast);
4200 switch (Kind) {
4201 case OBC_Bridge:
4202 break;
4203
4204 case OBC_BridgeRetained: {
4205 bool br = isKnownName("CFBridgingRelease");
4206 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4207 << 2
4208 << FromType
4209 << (T->isBlockPointerType()? 1 : 0)
4210 << T
4211 << SubExpr->getSourceRange()
4212 << Kind;
4213 Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4214 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge");
4215 Diag(BridgeKeywordLoc, diag::note_arc_bridge_transfer)
4216 << FromType << br
4217 << FixItHint::CreateReplacement(BridgeKeywordLoc,
4218 br ? "CFBridgingRelease "
4219 : "__bridge_transfer ");
4220
4221 Kind = OBC_Bridge;
4222 break;
4223 }
4224
4225 case OBC_BridgeTransfer:
4226 // We must consume the Objective-C object produced by the cast.
4227 MustConsume = true;
4228 break;
4229 }
4230 } else if (T->isCARCBridgableType() && FromType->isObjCARCBridgableType()) {
4231 // Okay: id -> CF
4232 CK = CK_BitCast;
4233 switch (Kind) {
4234 case OBC_Bridge:
4235 // Reclaiming a value that's going to be __bridge-casted to CF
4236 // is very dangerous, so we don't do it.
4237 SubExpr = maybeUndoReclaimObject(SubExpr);
4238 break;
4239
4240 case OBC_BridgeRetained:
4241 // Produce the object before casting it.
4242 SubExpr = ImplicitCastExpr::Create(Context, FromType,
4243 CK_ARCProduceObject,
4244 SubExpr, nullptr, VK_RValue);
4245 break;
4246
4247 case OBC_BridgeTransfer: {
4248 bool br = isKnownName("CFBridgingRetain");
4249 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4250 << (FromType->isBlockPointerType()? 1 : 0)
4251 << FromType
4252 << 2
4253 << T
4254 << SubExpr->getSourceRange()
4255 << Kind;
4256
4257 Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4258 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge ");
4259 Diag(BridgeKeywordLoc, diag::note_arc_bridge_retained)
4260 << T << br
4261 << FixItHint::CreateReplacement(BridgeKeywordLoc,
4262 br ? "CFBridgingRetain " : "__bridge_retained");
4263
4264 Kind = OBC_Bridge;
4265 break;
4266 }
4267 }
4268 } else {
4269 Diag(LParenLoc, diag::err_arc_bridge_cast_incompatible)
4270 << FromType << T << Kind
4271 << SubExpr->getSourceRange()
4272 << TSInfo->getTypeLoc().getSourceRange();
4273 return ExprError();
4274 }
4275
4276 Expr *Result = new (Context) ObjCBridgedCastExpr(LParenLoc, Kind, CK,
4277 BridgeKeywordLoc,
4278 TSInfo, SubExpr);
4279
4280 if (MustConsume) {
4281 ExprNeedsCleanups = true;
4282 Result = ImplicitCastExpr::Create(Context, T, CK_ARCConsumeObject, Result,
4283 nullptr, VK_RValue);
4284 }
4285
4286 return Result;
4287 }
4288
ActOnObjCBridgedCast(Scope * S,SourceLocation LParenLoc,ObjCBridgeCastKind Kind,SourceLocation BridgeKeywordLoc,ParsedType Type,SourceLocation RParenLoc,Expr * SubExpr)4289 ExprResult Sema::ActOnObjCBridgedCast(Scope *S,
4290 SourceLocation LParenLoc,
4291 ObjCBridgeCastKind Kind,
4292 SourceLocation BridgeKeywordLoc,
4293 ParsedType Type,
4294 SourceLocation RParenLoc,
4295 Expr *SubExpr) {
4296 TypeSourceInfo *TSInfo = nullptr;
4297 QualType T = GetTypeFromParser(Type, &TSInfo);
4298 if (Kind == OBC_Bridge)
4299 CheckTollFreeBridgeCast(T, SubExpr);
4300 if (!TSInfo)
4301 TSInfo = Context.getTrivialTypeSourceInfo(T, LParenLoc);
4302 return BuildObjCBridgedCast(LParenLoc, Kind, BridgeKeywordLoc, TSInfo,
4303 SubExpr);
4304 }
4305