Bug Summary

File:tools/clang/lib/Sema/SemaExprObjC.cpp
Warning:line 2400, column 7
Called C++ object pointer is null

Annotated Source Code

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
30using namespace clang;
31using namespace sema;
32using llvm::makeArrayRef;
33
34ExprResult Sema::ParseObjCStringLiteral(SourceLocation *AtLocs,
35 ArrayRef<Expr *> Strings) {
36 // Most ObjC strings are formed out of a single piece. However, we *can*
37 // have strings formed out of multiple @ strings with multiple pptokens in
38 // each one, e.g. @"foo" "bar" @"baz" "qux" which need to be turned into one
39 // StringLiteral for ObjCStringLiteral to hold onto.
40 StringLiteral *S = cast<StringLiteral>(Strings[0]);
41
42 // If we have a multi-part string, merge it all together.
43 if (Strings.size() != 1) {
44 // Concatenate objc strings.
45 SmallString<128> StrBuf;
46 SmallVector<SourceLocation, 8> StrLocs;
47
48 for (Expr *E : Strings) {
49 S = cast<StringLiteral>(E);
50
51 // ObjC strings can't be wide or UTF.
52 if (!S->isAscii()) {
53 Diag(S->getLocStart(), diag::err_cfstring_literal_not_string_constant)
54 << S->getSourceRange();
55 return true;
56 }
57
58 // Append the string.
59 StrBuf += S->getString();
60
61 // Get the locations of the string tokens.
62 StrLocs.append(S->tokloc_begin(), S->tokloc_end());
63 }
64
65 // Create the aggregate string with the appropriate content and location
66 // information.
67 const ConstantArrayType *CAT = Context.getAsConstantArrayType(S->getType());
68 assert(CAT && "String literal not of constant array type!")(static_cast <bool> (CAT && "String literal not of constant array type!"
) ? void (0) : __assert_fail ("CAT && \"String literal not of constant array type!\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 68, __extension__ __PRETTY_FUNCTION__))
;
69 QualType StrTy = Context.getConstantArrayType(
70 CAT->getElementType(), llvm::APInt(32, StrBuf.size() + 1),
71 CAT->getSizeModifier(), CAT->getIndexTypeCVRQualifiers());
72 S = StringLiteral::Create(Context, StrBuf, StringLiteral::Ascii,
73 /*Pascal=*/false, StrTy, &StrLocs[0],
74 StrLocs.size());
75 }
76
77 return BuildObjCStringLiteral(AtLocs[0], S);
78}
79
80ExprResult Sema::BuildObjCStringLiteral(SourceLocation AtLoc, StringLiteral *S){
81 // Verify that this composite string is acceptable for ObjC strings.
82 if (CheckObjCString(S))
83 return true;
84
85 // Initialize the constant string interface lazily. This assumes
86 // the NSString interface is seen in this translation unit. Note: We
87 // don't use NSConstantString, since the runtime team considers this
88 // interface private (even though it appears in the header files).
89 QualType Ty = Context.getObjCConstantStringInterface();
90 if (!Ty.isNull()) {
91 Ty = Context.getObjCObjectPointerType(Ty);
92 } else if (getLangOpts().NoConstantCFStrings) {
93 IdentifierInfo *NSIdent=nullptr;
94 std::string StringClass(getLangOpts().ObjCConstantStringClass);
95
96 if (StringClass.empty())
97 NSIdent = &Context.Idents.get("NSConstantString");
98 else
99 NSIdent = &Context.Idents.get(StringClass);
100
101 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc,
102 LookupOrdinaryName);
103 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
104 Context.setObjCConstantStringInterface(StrIF);
105 Ty = Context.getObjCConstantStringInterface();
106 Ty = Context.getObjCObjectPointerType(Ty);
107 } else {
108 // If there is no NSConstantString interface defined then treat this
109 // as error and recover from it.
110 Diag(S->getLocStart(), diag::err_no_nsconstant_string_class) << NSIdent
111 << S->getSourceRange();
112 Ty = Context.getObjCIdType();
113 }
114 } else {
115 IdentifierInfo *NSIdent = NSAPIObj->getNSClassId(NSAPI::ClassId_NSString);
116 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc,
117 LookupOrdinaryName);
118 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
119 Context.setObjCConstantStringInterface(StrIF);
120 Ty = Context.getObjCConstantStringInterface();
121 Ty = Context.getObjCObjectPointerType(Ty);
122 } else {
123 // If there is no NSString interface defined, implicitly declare
124 // a @class NSString; and use that instead. This is to make sure
125 // type of an NSString literal is represented correctly, instead of
126 // being an 'id' type.
127 Ty = Context.getObjCNSStringType();
128 if (Ty.isNull()) {
129 ObjCInterfaceDecl *NSStringIDecl =
130 ObjCInterfaceDecl::Create (Context,
131 Context.getTranslationUnitDecl(),
132 SourceLocation(), NSIdent,
133 nullptr, nullptr, SourceLocation());
134 Ty = Context.getObjCInterfaceType(NSStringIDecl);
135 Context.setObjCNSStringType(Ty);
136 }
137 Ty = Context.getObjCObjectPointerType(Ty);
138 }
139 }
140
141 return new (Context) ObjCStringLiteral(S, Ty, AtLoc);
142}
143
144/// \brief Emits an error if the given method does not exist, or if the return
145/// type is not an Objective-C object.
146static bool validateBoxingMethod(Sema &S, SourceLocation Loc,
147 const ObjCInterfaceDecl *Class,
148 Selector Sel, const ObjCMethodDecl *Method) {
149 if (!Method) {
150 // FIXME: Is there a better way to avoid quotes than using getName()?
151 S.Diag(Loc, diag::err_undeclared_boxing_method) << Sel << Class->getName();
152 return false;
153 }
154
155 // Make sure the return type is reasonable.
156 QualType ReturnType = Method->getReturnType();
157 if (!ReturnType->isObjCObjectPointerType()) {
158 S.Diag(Loc, diag::err_objc_literal_method_sig)
159 << Sel;
160 S.Diag(Method->getLocation(), diag::note_objc_literal_method_return)
161 << ReturnType;
162 return false;
163 }
164
165 return true;
166}
167
168/// \brief Maps ObjCLiteralKind to NSClassIdKindKind
169static NSAPI::NSClassIdKindKind ClassKindFromLiteralKind(
170 Sema::ObjCLiteralKind LiteralKind) {
171 switch (LiteralKind) {
172 case Sema::LK_Array:
173 return NSAPI::ClassId_NSArray;
174 case Sema::LK_Dictionary:
175 return NSAPI::ClassId_NSDictionary;
176 case Sema::LK_Numeric:
177 return NSAPI::ClassId_NSNumber;
178 case Sema::LK_String:
179 return NSAPI::ClassId_NSString;
180 case Sema::LK_Boxed:
181 return NSAPI::ClassId_NSValue;
182
183 // there is no corresponding matching
184 // between LK_None/LK_Block and NSClassIdKindKind
185 case Sema::LK_Block:
186 case Sema::LK_None:
187 break;
188 }
189 llvm_unreachable("LiteralKind can't be converted into a ClassKind")::llvm::llvm_unreachable_internal("LiteralKind can't be converted into a ClassKind"
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 189)
;
190}
191
192/// \brief Validates ObjCInterfaceDecl availability.
193/// ObjCInterfaceDecl, used to create ObjC literals, should be defined
194/// if clang not in a debugger mode.
195static bool ValidateObjCLiteralInterfaceDecl(Sema &S, ObjCInterfaceDecl *Decl,
196 SourceLocation Loc,
197 Sema::ObjCLiteralKind LiteralKind) {
198 if (!Decl) {
199 NSAPI::NSClassIdKindKind Kind = ClassKindFromLiteralKind(LiteralKind);
200 IdentifierInfo *II = S.NSAPIObj->getNSClassId(Kind);
201 S.Diag(Loc, diag::err_undeclared_objc_literal_class)
202 << II->getName() << LiteralKind;
203 return false;
204 } else if (!Decl->hasDefinition() && !S.getLangOpts().DebuggerObjCLiteral) {
205 S.Diag(Loc, diag::err_undeclared_objc_literal_class)
206 << Decl->getName() << LiteralKind;
207 S.Diag(Decl->getLocation(), diag::note_forward_class);
208 return false;
209 }
210
211 return true;
212}
213
214/// \brief Looks up ObjCInterfaceDecl of a given NSClassIdKindKind.
215/// Used to create ObjC literals, such as NSDictionary (@{}),
216/// NSArray (@[]) and Boxed Expressions (@())
217static ObjCInterfaceDecl *LookupObjCInterfaceDeclForLiteral(Sema &S,
218 SourceLocation Loc,
219 Sema::ObjCLiteralKind LiteralKind) {
220 NSAPI::NSClassIdKindKind ClassKind = ClassKindFromLiteralKind(LiteralKind);
221 IdentifierInfo *II = S.NSAPIObj->getNSClassId(ClassKind);
222 NamedDecl *IF = S.LookupSingleName(S.TUScope, II, Loc,
223 Sema::LookupOrdinaryName);
224 ObjCInterfaceDecl *ID = dyn_cast_or_null<ObjCInterfaceDecl>(IF);
225 if (!ID && S.getLangOpts().DebuggerObjCLiteral) {
226 ASTContext &Context = S.Context;
227 TranslationUnitDecl *TU = Context.getTranslationUnitDecl();
228 ID = ObjCInterfaceDecl::Create (Context, TU, SourceLocation(), II,
229 nullptr, nullptr, SourceLocation());
230 }
231
232 if (!ValidateObjCLiteralInterfaceDecl(S, ID, Loc, LiteralKind)) {
233 ID = nullptr;
234 }
235
236 return ID;
237}
238
239/// \brief Retrieve the NSNumber factory method that should be used to create
240/// an Objective-C literal for the given type.
241static ObjCMethodDecl *getNSNumberFactoryMethod(Sema &S, SourceLocation Loc,
242 QualType NumberType,
243 bool isLiteral = false,
244 SourceRange R = SourceRange()) {
245 Optional<NSAPI::NSNumberLiteralMethodKind> Kind =
246 S.NSAPIObj->getNSNumberFactoryMethodKind(NumberType);
247
248 if (!Kind) {
249 if (isLiteral) {
250 S.Diag(Loc, diag::err_invalid_nsnumber_type)
251 << NumberType << R;
252 }
253 return nullptr;
254 }
255
256 // If we already looked up this method, we're done.
257 if (S.NSNumberLiteralMethods[*Kind])
258 return S.NSNumberLiteralMethods[*Kind];
259
260 Selector Sel = S.NSAPIObj->getNSNumberLiteralSelector(*Kind,
261 /*Instance=*/false);
262
263 ASTContext &CX = S.Context;
264
265 // Look up the NSNumber class, if we haven't done so already. It's cached
266 // in the Sema instance.
267 if (!S.NSNumberDecl) {
268 S.NSNumberDecl = LookupObjCInterfaceDeclForLiteral(S, Loc,
269 Sema::LK_Numeric);
270 if (!S.NSNumberDecl) {
271 return nullptr;
272 }
273 }
274
275 if (S.NSNumberPointer.isNull()) {
276 // generate the pointer to NSNumber type.
277 QualType NSNumberObject = CX.getObjCInterfaceType(S.NSNumberDecl);
278 S.NSNumberPointer = CX.getObjCObjectPointerType(NSNumberObject);
279 }
280
281 // Look for the appropriate method within NSNumber.
282 ObjCMethodDecl *Method = S.NSNumberDecl->lookupClassMethod(Sel);
283 if (!Method && S.getLangOpts().DebuggerObjCLiteral) {
284 // create a stub definition this NSNumber factory method.
285 TypeSourceInfo *ReturnTInfo = nullptr;
286 Method =
287 ObjCMethodDecl::Create(CX, SourceLocation(), SourceLocation(), Sel,
288 S.NSNumberPointer, ReturnTInfo, S.NSNumberDecl,
289 /*isInstance=*/false, /*isVariadic=*/false,
290 /*isPropertyAccessor=*/false,
291 /*isImplicitlyDeclared=*/true,
292 /*isDefined=*/false, ObjCMethodDecl::Required,
293 /*HasRelatedResultType=*/false);
294 ParmVarDecl *value = ParmVarDecl::Create(S.Context, Method,
295 SourceLocation(), SourceLocation(),
296 &CX.Idents.get("value"),
297 NumberType, /*TInfo=*/nullptr,
298 SC_None, nullptr);
299 Method->setMethodParams(S.Context, value, None);
300 }
301
302 if (!validateBoxingMethod(S, Loc, S.NSNumberDecl, Sel, Method))
303 return nullptr;
304
305 // Note: if the parameter type is out-of-line, we'll catch it later in the
306 // implicit conversion.
307
308 S.NSNumberLiteralMethods[*Kind] = Method;
309 return Method;
310}
311
312/// BuildObjCNumericLiteral - builds an ObjCBoxedExpr AST node for the
313/// numeric literal expression. Type of the expression will be "NSNumber *".
314ExprResult Sema::BuildObjCNumericLiteral(SourceLocation AtLoc, Expr *Number) {
315 // Determine the type of the literal.
316 QualType NumberType = Number->getType();
317 if (CharacterLiteral *Char = dyn_cast<CharacterLiteral>(Number)) {
318 // In C, character literals have type 'int'. That's not the type we want
319 // to use to determine the Objective-c literal kind.
320 switch (Char->getKind()) {
321 case CharacterLiteral::Ascii:
322 case CharacterLiteral::UTF8:
323 NumberType = Context.CharTy;
324 break;
325
326 case CharacterLiteral::Wide:
327 NumberType = Context.getWideCharType();
328 break;
329
330 case CharacterLiteral::UTF16:
331 NumberType = Context.Char16Ty;
332 break;
333
334 case CharacterLiteral::UTF32:
335 NumberType = Context.Char32Ty;
336 break;
337 }
338 }
339
340 // Look for the appropriate method within NSNumber.
341 // Construct the literal.
342 SourceRange NR(Number->getSourceRange());
343 ObjCMethodDecl *Method = getNSNumberFactoryMethod(*this, AtLoc, NumberType,
344 true, NR);
345 if (!Method)
346 return ExprError();
347
348 // Convert the number to the type that the parameter expects.
349 ParmVarDecl *ParamDecl = Method->parameters()[0];
350 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
351 ParamDecl);
352 ExprResult ConvertedNumber = PerformCopyInitialization(Entity,
353 SourceLocation(),
354 Number);
355 if (ConvertedNumber.isInvalid())
356 return ExprError();
357 Number = ConvertedNumber.get();
358
359 // Use the effective source range of the literal, including the leading '@'.
360 return MaybeBindToTemporary(
361 new (Context) ObjCBoxedExpr(Number, NSNumberPointer, Method,
362 SourceRange(AtLoc, NR.getEnd())));
363}
364
365ExprResult Sema::ActOnObjCBoolLiteral(SourceLocation AtLoc,
366 SourceLocation ValueLoc,
367 bool Value) {
368 ExprResult Inner;
369 if (getLangOpts().CPlusPlus) {
370 Inner = ActOnCXXBoolLiteral(ValueLoc, Value? tok::kw_true : tok::kw_false);
371 } else {
372 // C doesn't actually have a way to represent literal values of type
373 // _Bool. So, we'll use 0/1 and implicit cast to _Bool.
374 Inner = ActOnIntegerConstant(ValueLoc, Value? 1 : 0);
375 Inner = ImpCastExprToType(Inner.get(), Context.BoolTy,
376 CK_IntegralToBoolean);
377 }
378
379 return BuildObjCNumericLiteral(AtLoc, Inner.get());
380}
381
382/// \brief Check that the given expression is a valid element of an Objective-C
383/// collection literal.
384static ExprResult CheckObjCCollectionLiteralElement(Sema &S, Expr *Element,
385 QualType T,
386 bool ArrayLiteral = false) {
387 // If the expression is type-dependent, there's nothing for us to do.
388 if (Element->isTypeDependent())
389 return Element;
390
391 ExprResult Result = S.CheckPlaceholderExpr(Element);
392 if (Result.isInvalid())
393 return ExprError();
394 Element = Result.get();
395
396 // In C++, check for an implicit conversion to an Objective-C object pointer
397 // type.
398 if (S.getLangOpts().CPlusPlus && Element->getType()->isRecordType()) {
399 InitializedEntity Entity
400 = InitializedEntity::InitializeParameter(S.Context, T,
401 /*Consumed=*/false);
402 InitializationKind Kind
403 = InitializationKind::CreateCopy(Element->getLocStart(),
404 SourceLocation());
405 InitializationSequence Seq(S, Entity, Kind, Element);
406 if (!Seq.Failed())
407 return Seq.Perform(S, Entity, Kind, Element);
408 }
409
410 Expr *OrigElement = Element;
411
412 // Perform lvalue-to-rvalue conversion.
413 Result = S.DefaultLvalueConversion(Element);
414 if (Result.isInvalid())
415 return ExprError();
416 Element = Result.get();
417
418 // Make sure that we have an Objective-C pointer type or block.
419 if (!Element->getType()->isObjCObjectPointerType() &&
420 !Element->getType()->isBlockPointerType()) {
421 bool Recovered = false;
422
423 // If this is potentially an Objective-C numeric literal, add the '@'.
424 if (isa<IntegerLiteral>(OrigElement) ||
425 isa<CharacterLiteral>(OrigElement) ||
426 isa<FloatingLiteral>(OrigElement) ||
427 isa<ObjCBoolLiteralExpr>(OrigElement) ||
428 isa<CXXBoolLiteralExpr>(OrigElement)) {
429 if (S.NSAPIObj->getNSNumberFactoryMethodKind(OrigElement->getType())) {
430 int Which = isa<CharacterLiteral>(OrigElement) ? 1
431 : (isa<CXXBoolLiteralExpr>(OrigElement) ||
432 isa<ObjCBoolLiteralExpr>(OrigElement)) ? 2
433 : 3;
434
435 S.Diag(OrigElement->getLocStart(), diag::err_box_literal_collection)
436 << Which << OrigElement->getSourceRange()
437 << FixItHint::CreateInsertion(OrigElement->getLocStart(), "@");
438
439 Result = S.BuildObjCNumericLiteral(OrigElement->getLocStart(),
440 OrigElement);
441 if (Result.isInvalid())
442 return ExprError();
443
444 Element = Result.get();
445 Recovered = true;
446 }
447 }
448 // If this is potentially an Objective-C string literal, add the '@'.
449 else if (StringLiteral *String = dyn_cast<StringLiteral>(OrigElement)) {
450 if (String->isAscii()) {
451 S.Diag(OrigElement->getLocStart(), diag::err_box_literal_collection)
452 << 0 << OrigElement->getSourceRange()
453 << FixItHint::CreateInsertion(OrigElement->getLocStart(), "@");
454
455 Result = S.BuildObjCStringLiteral(OrigElement->getLocStart(), String);
456 if (Result.isInvalid())
457 return ExprError();
458
459 Element = Result.get();
460 Recovered = true;
461 }
462 }
463
464 if (!Recovered) {
465 S.Diag(Element->getLocStart(), diag::err_invalid_collection_element)
466 << Element->getType();
467 return ExprError();
468 }
469 }
470 if (ArrayLiteral)
471 if (ObjCStringLiteral *getString =
472 dyn_cast<ObjCStringLiteral>(OrigElement)) {
473 if (StringLiteral *SL = getString->getString()) {
474 unsigned numConcat = SL->getNumConcatenated();
475 if (numConcat > 1) {
476 // Only warn if the concatenated string doesn't come from a macro.
477 bool hasMacro = false;
478 for (unsigned i = 0; i < numConcat ; ++i)
479 if (SL->getStrTokenLoc(i).isMacroID()) {
480 hasMacro = true;
481 break;
482 }
483 if (!hasMacro)
484 S.Diag(Element->getLocStart(),
485 diag::warn_concatenated_nsarray_literal)
486 << Element->getType();
487 }
488 }
489 }
490
491 // Make sure that the element has the type that the container factory
492 // function expects.
493 return S.PerformCopyInitialization(
494 InitializedEntity::InitializeParameter(S.Context, T,
495 /*Consumed=*/false),
496 Element->getLocStart(), Element);
497}
498
499ExprResult Sema::BuildObjCBoxedExpr(SourceRange SR, Expr *ValueExpr) {
500 if (ValueExpr->isTypeDependent()) {
501 ObjCBoxedExpr *BoxedExpr =
502 new (Context) ObjCBoxedExpr(ValueExpr, Context.DependentTy, nullptr, SR);
503 return BoxedExpr;
504 }
505 ObjCMethodDecl *BoxingMethod = nullptr;
506 QualType BoxedType;
507 // Convert the expression to an RValue, so we can check for pointer types...
508 ExprResult RValue = DefaultFunctionArrayLvalueConversion(ValueExpr);
509 if (RValue.isInvalid()) {
510 return ExprError();
511 }
512 SourceLocation Loc = SR.getBegin();
513 ValueExpr = RValue.get();
514 QualType ValueType(ValueExpr->getType());
515 if (const PointerType *PT = ValueType->getAs<PointerType>()) {
516 QualType PointeeType = PT->getPointeeType();
517 if (Context.hasSameUnqualifiedType(PointeeType, Context.CharTy)) {
518
519 if (!NSStringDecl) {
520 NSStringDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
521 Sema::LK_String);
522 if (!NSStringDecl) {
523 return ExprError();
524 }
525 QualType NSStringObject = Context.getObjCInterfaceType(NSStringDecl);
526 NSStringPointer = Context.getObjCObjectPointerType(NSStringObject);
527 }
528
529 if (!StringWithUTF8StringMethod) {
530 IdentifierInfo *II = &Context.Idents.get("stringWithUTF8String");
531 Selector stringWithUTF8String = Context.Selectors.getUnarySelector(II);
532
533 // Look for the appropriate method within NSString.
534 BoxingMethod = NSStringDecl->lookupClassMethod(stringWithUTF8String);
535 if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) {
536 // Debugger needs to work even if NSString hasn't been defined.
537 TypeSourceInfo *ReturnTInfo = nullptr;
538 ObjCMethodDecl *M = ObjCMethodDecl::Create(
539 Context, SourceLocation(), SourceLocation(), stringWithUTF8String,
540 NSStringPointer, ReturnTInfo, NSStringDecl,
541 /*isInstance=*/false, /*isVariadic=*/false,
542 /*isPropertyAccessor=*/false,
543 /*isImplicitlyDeclared=*/true,
544 /*isDefined=*/false, ObjCMethodDecl::Required,
545 /*HasRelatedResultType=*/false);
546 QualType ConstCharType = Context.CharTy.withConst();
547 ParmVarDecl *value =
548 ParmVarDecl::Create(Context, M,
549 SourceLocation(), SourceLocation(),
550 &Context.Idents.get("value"),
551 Context.getPointerType(ConstCharType),
552 /*TInfo=*/nullptr,
553 SC_None, nullptr);
554 M->setMethodParams(Context, value, None);
555 BoxingMethod = M;
556 }
557
558 if (!validateBoxingMethod(*this, Loc, NSStringDecl,
559 stringWithUTF8String, BoxingMethod))
560 return ExprError();
561
562 StringWithUTF8StringMethod = BoxingMethod;
563 }
564
565 BoxingMethod = StringWithUTF8StringMethod;
566 BoxedType = NSStringPointer;
567 // Transfer the nullability from method's return type.
568 Optional<NullabilityKind> Nullability =
569 BoxingMethod->getReturnType()->getNullability(Context);
570 if (Nullability)
571 BoxedType = Context.getAttributedType(
572 AttributedType::getNullabilityAttrKind(*Nullability), BoxedType,
573 BoxedType);
574 }
575 } else if (ValueType->isBuiltinType()) {
576 // The other types we support are numeric, char and BOOL/bool. We could also
577 // provide limited support for structure types, such as NSRange, NSRect, and
578 // NSSize. See NSValue (NSValueGeometryExtensions) in <Foundation/NSGeometry.h>
579 // for more details.
580
581 // Check for a top-level character literal.
582 if (const CharacterLiteral *Char =
583 dyn_cast<CharacterLiteral>(ValueExpr->IgnoreParens())) {
584 // In C, character literals have type 'int'. That's not the type we want
585 // to use to determine the Objective-c literal kind.
586 switch (Char->getKind()) {
587 case CharacterLiteral::Ascii:
588 case CharacterLiteral::UTF8:
589 ValueType = Context.CharTy;
590 break;
591
592 case CharacterLiteral::Wide:
593 ValueType = Context.getWideCharType();
594 break;
595
596 case CharacterLiteral::UTF16:
597 ValueType = Context.Char16Ty;
598 break;
599
600 case CharacterLiteral::UTF32:
601 ValueType = Context.Char32Ty;
602 break;
603 }
604 }
605 // FIXME: Do I need to do anything special with BoolTy expressions?
606
607 // Look for the appropriate method within NSNumber.
608 BoxingMethod = getNSNumberFactoryMethod(*this, Loc, ValueType);
609 BoxedType = NSNumberPointer;
610 } else if (const EnumType *ET = ValueType->getAs<EnumType>()) {
611 if (!ET->getDecl()->isComplete()) {
612 Diag(Loc, diag::err_objc_incomplete_boxed_expression_type)
613 << ValueType << ValueExpr->getSourceRange();
614 return ExprError();
615 }
616
617 BoxingMethod = getNSNumberFactoryMethod(*this, Loc,
618 ET->getDecl()->getIntegerType());
619 BoxedType = NSNumberPointer;
620 } else if (ValueType->isObjCBoxableRecordType()) {
621 // Support for structure types, that marked as objc_boxable
622 // struct __attribute__((objc_boxable)) s { ... };
623
624 // Look up the NSValue class, if we haven't done so already. It's cached
625 // in the Sema instance.
626 if (!NSValueDecl) {
627 NSValueDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
628 Sema::LK_Boxed);
629 if (!NSValueDecl) {
630 return ExprError();
631 }
632
633 // generate the pointer to NSValue type.
634 QualType NSValueObject = Context.getObjCInterfaceType(NSValueDecl);
635 NSValuePointer = Context.getObjCObjectPointerType(NSValueObject);
636 }
637
638 if (!ValueWithBytesObjCTypeMethod) {
639 IdentifierInfo *II[] = {
640 &Context.Idents.get("valueWithBytes"),
641 &Context.Idents.get("objCType")
642 };
643 Selector ValueWithBytesObjCType = Context.Selectors.getSelector(2, II);
644
645 // Look for the appropriate method within NSValue.
646 BoxingMethod = NSValueDecl->lookupClassMethod(ValueWithBytesObjCType);
647 if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) {
648 // Debugger needs to work even if NSValue hasn't been defined.
649 TypeSourceInfo *ReturnTInfo = nullptr;
650 ObjCMethodDecl *M = ObjCMethodDecl::Create(
651 Context,
652 SourceLocation(),
653 SourceLocation(),
654 ValueWithBytesObjCType,
655 NSValuePointer,
656 ReturnTInfo,
657 NSValueDecl,
658 /*isInstance=*/false,
659 /*isVariadic=*/false,
660 /*isPropertyAccessor=*/false,
661 /*isImplicitlyDeclared=*/true,
662 /*isDefined=*/false,
663 ObjCMethodDecl::Required,
664 /*HasRelatedResultType=*/false);
665
666 SmallVector<ParmVarDecl *, 2> Params;
667
668 ParmVarDecl *bytes =
669 ParmVarDecl::Create(Context, M,
670 SourceLocation(), SourceLocation(),
671 &Context.Idents.get("bytes"),
672 Context.VoidPtrTy.withConst(),
673 /*TInfo=*/nullptr,
674 SC_None, nullptr);
675 Params.push_back(bytes);
676
677 QualType ConstCharType = Context.CharTy.withConst();
678 ParmVarDecl *type =
679 ParmVarDecl::Create(Context, M,
680 SourceLocation(), SourceLocation(),
681 &Context.Idents.get("type"),
682 Context.getPointerType(ConstCharType),
683 /*TInfo=*/nullptr,
684 SC_None, nullptr);
685 Params.push_back(type);
686
687 M->setMethodParams(Context, Params, None);
688 BoxingMethod = M;
689 }
690
691 if (!validateBoxingMethod(*this, Loc, NSValueDecl,
692 ValueWithBytesObjCType, BoxingMethod))
693 return ExprError();
694
695 ValueWithBytesObjCTypeMethod = BoxingMethod;
696 }
697
698 if (!ValueType.isTriviallyCopyableType(Context)) {
699 Diag(Loc, diag::err_objc_non_trivially_copyable_boxed_expression_type)
700 << ValueType << ValueExpr->getSourceRange();
701 return ExprError();
702 }
703
704 BoxingMethod = ValueWithBytesObjCTypeMethod;
705 BoxedType = NSValuePointer;
706 }
707
708 if (!BoxingMethod) {
709 Diag(Loc, diag::err_objc_illegal_boxed_expression_type)
710 << ValueType << ValueExpr->getSourceRange();
711 return ExprError();
712 }
713
714 DiagnoseUseOfDecl(BoxingMethod, Loc);
715
716 ExprResult ConvertedValueExpr;
717 if (ValueType->isObjCBoxableRecordType()) {
718 InitializedEntity IE = InitializedEntity::InitializeTemporary(ValueType);
719 ConvertedValueExpr = PerformCopyInitialization(IE, ValueExpr->getExprLoc(),
720 ValueExpr);
721 } else {
722 // Convert the expression to the type that the parameter requires.
723 ParmVarDecl *ParamDecl = BoxingMethod->parameters()[0];
724 InitializedEntity IE = InitializedEntity::InitializeParameter(Context,
725 ParamDecl);
726 ConvertedValueExpr = PerformCopyInitialization(IE, SourceLocation(),
727 ValueExpr);
728 }
729
730 if (ConvertedValueExpr.isInvalid())
731 return ExprError();
732 ValueExpr = ConvertedValueExpr.get();
733
734 ObjCBoxedExpr *BoxedExpr =
735 new (Context) ObjCBoxedExpr(ValueExpr, BoxedType,
736 BoxingMethod, SR);
737 return MaybeBindToTemporary(BoxedExpr);
738}
739
740/// Build an ObjC subscript pseudo-object expression, given that
741/// that's supported by the runtime.
742ExprResult Sema::BuildObjCSubscriptExpression(SourceLocation RB, Expr *BaseExpr,
743 Expr *IndexExpr,
744 ObjCMethodDecl *getterMethod,
745 ObjCMethodDecl *setterMethod) {
746 assert(!LangOpts.isSubscriptPointerArithmetic())(static_cast <bool> (!LangOpts.isSubscriptPointerArithmetic
()) ? void (0) : __assert_fail ("!LangOpts.isSubscriptPointerArithmetic()"
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 746, __extension__ __PRETTY_FUNCTION__))
;
747
748 // We can't get dependent types here; our callers should have
749 // filtered them out.
750 assert((!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) &&(static_cast <bool> ((!BaseExpr->isTypeDependent() &&
!IndexExpr->isTypeDependent()) && "base or index cannot have dependent type here"
) ? void (0) : __assert_fail ("(!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) && \"base or index cannot have dependent type here\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 751, __extension__ __PRETTY_FUNCTION__))
751 "base or index cannot have dependent type here")(static_cast <bool> ((!BaseExpr->isTypeDependent() &&
!IndexExpr->isTypeDependent()) && "base or index cannot have dependent type here"
) ? void (0) : __assert_fail ("(!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) && \"base or index cannot have dependent type here\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 751, __extension__ __PRETTY_FUNCTION__))
;
752
753 // Filter out placeholders in the index. In theory, overloads could
754 // be preserved here, although that might not actually work correctly.
755 ExprResult Result = CheckPlaceholderExpr(IndexExpr);
756 if (Result.isInvalid())
757 return ExprError();
758 IndexExpr = Result.get();
759
760 // Perform lvalue-to-rvalue conversion on the base.
761 Result = DefaultLvalueConversion(BaseExpr);
762 if (Result.isInvalid())
763 return ExprError();
764 BaseExpr = Result.get();
765
766 // Build the pseudo-object expression.
767 return new (Context) ObjCSubscriptRefExpr(
768 BaseExpr, IndexExpr, Context.PseudoObjectTy, VK_LValue, OK_ObjCSubscript,
769 getterMethod, setterMethod, RB);
770}
771
772ExprResult Sema::BuildObjCArrayLiteral(SourceRange SR, MultiExprArg Elements) {
773 SourceLocation Loc = SR.getBegin();
774
775 if (!NSArrayDecl) {
776 NSArrayDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
777 Sema::LK_Array);
778 if (!NSArrayDecl) {
779 return ExprError();
780 }
781 }
782
783 // Find the arrayWithObjects:count: method, if we haven't done so already.
784 QualType IdT = Context.getObjCIdType();
785 if (!ArrayWithObjectsMethod) {
786 Selector
787 Sel = NSAPIObj->getNSArraySelector(NSAPI::NSArr_arrayWithObjectsCount);
788 ObjCMethodDecl *Method = NSArrayDecl->lookupClassMethod(Sel);
789 if (!Method && getLangOpts().DebuggerObjCLiteral) {
790 TypeSourceInfo *ReturnTInfo = nullptr;
791 Method = ObjCMethodDecl::Create(
792 Context, SourceLocation(), SourceLocation(), Sel, IdT, ReturnTInfo,
793 Context.getTranslationUnitDecl(), false /*Instance*/,
794 false /*isVariadic*/,
795 /*isPropertyAccessor=*/false,
796 /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
797 ObjCMethodDecl::Required, false);
798 SmallVector<ParmVarDecl *, 2> Params;
799 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
800 SourceLocation(),
801 SourceLocation(),
802 &Context.Idents.get("objects"),
803 Context.getPointerType(IdT),
804 /*TInfo=*/nullptr,
805 SC_None, nullptr);
806 Params.push_back(objects);
807 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
808 SourceLocation(),
809 SourceLocation(),
810 &Context.Idents.get("cnt"),
811 Context.UnsignedLongTy,
812 /*TInfo=*/nullptr, SC_None,
813 nullptr);
814 Params.push_back(cnt);
815 Method->setMethodParams(Context, Params, None);
816 }
817
818 if (!validateBoxingMethod(*this, Loc, NSArrayDecl, Sel, Method))
819 return ExprError();
820
821 // Dig out the type that all elements should be converted to.
822 QualType T = Method->parameters()[0]->getType();
823 const PointerType *PtrT = T->getAs<PointerType>();
824 if (!PtrT ||
825 !Context.hasSameUnqualifiedType(PtrT->getPointeeType(), IdT)) {
826 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
827 << Sel;
828 Diag(Method->parameters()[0]->getLocation(),
829 diag::note_objc_literal_method_param)
830 << 0 << T
831 << Context.getPointerType(IdT.withConst());
832 return ExprError();
833 }
834
835 // Check that the 'count' parameter is integral.
836 if (!Method->parameters()[1]->getType()->isIntegerType()) {
837 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
838 << Sel;
839 Diag(Method->parameters()[1]->getLocation(),
840 diag::note_objc_literal_method_param)
841 << 1
842 << Method->parameters()[1]->getType()
843 << "integral";
844 return ExprError();
845 }
846
847 // We've found a good +arrayWithObjects:count: method. Save it!
848 ArrayWithObjectsMethod = Method;
849 }
850
851 QualType ObjectsType = ArrayWithObjectsMethod->parameters()[0]->getType();
852 QualType RequiredType = ObjectsType->castAs<PointerType>()->getPointeeType();
853
854 // Check that each of the elements provided is valid in a collection literal,
855 // performing conversions as necessary.
856 Expr **ElementsBuffer = Elements.data();
857 for (unsigned I = 0, N = Elements.size(); I != N; ++I) {
858 ExprResult Converted = CheckObjCCollectionLiteralElement(*this,
859 ElementsBuffer[I],
860 RequiredType, true);
861 if (Converted.isInvalid())
862 return ExprError();
863
864 ElementsBuffer[I] = Converted.get();
865 }
866
867 QualType Ty
868 = Context.getObjCObjectPointerType(
869 Context.getObjCInterfaceType(NSArrayDecl));
870
871 return MaybeBindToTemporary(
872 ObjCArrayLiteral::Create(Context, Elements, Ty,
873 ArrayWithObjectsMethod, SR));
874}
875
876ExprResult Sema::BuildObjCDictionaryLiteral(SourceRange SR,
877 MutableArrayRef<ObjCDictionaryElement> Elements) {
878 SourceLocation Loc = SR.getBegin();
879
880 if (!NSDictionaryDecl) {
881 NSDictionaryDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
882 Sema::LK_Dictionary);
883 if (!NSDictionaryDecl) {
884 return ExprError();
885 }
886 }
887
888 // Find the dictionaryWithObjects:forKeys:count: method, if we haven't done
889 // so already.
890 QualType IdT = Context.getObjCIdType();
891 if (!DictionaryWithObjectsMethod) {
892 Selector Sel = NSAPIObj->getNSDictionarySelector(
893 NSAPI::NSDict_dictionaryWithObjectsForKeysCount);
894 ObjCMethodDecl *Method = NSDictionaryDecl->lookupClassMethod(Sel);
895 if (!Method && getLangOpts().DebuggerObjCLiteral) {
896 Method = ObjCMethodDecl::Create(Context,
897 SourceLocation(), SourceLocation(), Sel,
898 IdT,
899 nullptr /*TypeSourceInfo */,
900 Context.getTranslationUnitDecl(),
901 false /*Instance*/, false/*isVariadic*/,
902 /*isPropertyAccessor=*/false,
903 /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
904 ObjCMethodDecl::Required,
905 false);
906 SmallVector<ParmVarDecl *, 3> Params;
907 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
908 SourceLocation(),
909 SourceLocation(),
910 &Context.Idents.get("objects"),
911 Context.getPointerType(IdT),
912 /*TInfo=*/nullptr, SC_None,
913 nullptr);
914 Params.push_back(objects);
915 ParmVarDecl *keys = ParmVarDecl::Create(Context, Method,
916 SourceLocation(),
917 SourceLocation(),
918 &Context.Idents.get("keys"),
919 Context.getPointerType(IdT),
920 /*TInfo=*/nullptr, SC_None,
921 nullptr);
922 Params.push_back(keys);
923 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
924 SourceLocation(),
925 SourceLocation(),
926 &Context.Idents.get("cnt"),
927 Context.UnsignedLongTy,
928 /*TInfo=*/nullptr, SC_None,
929 nullptr);
930 Params.push_back(cnt);
931 Method->setMethodParams(Context, Params, None);
932 }
933
934 if (!validateBoxingMethod(*this, SR.getBegin(), NSDictionaryDecl, Sel,
935 Method))
936 return ExprError();
937
938 // Dig out the type that all values should be converted to.
939 QualType ValueT = Method->parameters()[0]->getType();
940 const PointerType *PtrValue = ValueT->getAs<PointerType>();
941 if (!PtrValue ||
942 !Context.hasSameUnqualifiedType(PtrValue->getPointeeType(), IdT)) {
943 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
944 << Sel;
945 Diag(Method->parameters()[0]->getLocation(),
946 diag::note_objc_literal_method_param)
947 << 0 << ValueT
948 << Context.getPointerType(IdT.withConst());
949 return ExprError();
950 }
951
952 // Dig out the type that all keys should be converted to.
953 QualType KeyT = Method->parameters()[1]->getType();
954 const PointerType *PtrKey = KeyT->getAs<PointerType>();
955 if (!PtrKey ||
956 !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
957 IdT)) {
958 bool err = true;
959 if (PtrKey) {
960 if (QIDNSCopying.isNull()) {
961 // key argument of selector is id<NSCopying>?
962 if (ObjCProtocolDecl *NSCopyingPDecl =
963 LookupProtocol(&Context.Idents.get("NSCopying"), SR.getBegin())) {
964 ObjCProtocolDecl *PQ[] = {NSCopyingPDecl};
965 QIDNSCopying =
966 Context.getObjCObjectType(Context.ObjCBuiltinIdTy, { },
967 llvm::makeArrayRef(
968 (ObjCProtocolDecl**) PQ,
969 1),
970 false);
971 QIDNSCopying = Context.getObjCObjectPointerType(QIDNSCopying);
972 }
973 }
974 if (!QIDNSCopying.isNull())
975 err = !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
976 QIDNSCopying);
977 }
978
979 if (err) {
980 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
981 << Sel;
982 Diag(Method->parameters()[1]->getLocation(),
983 diag::note_objc_literal_method_param)
984 << 1 << KeyT
985 << Context.getPointerType(IdT.withConst());
986 return ExprError();
987 }
988 }
989
990 // Check that the 'count' parameter is integral.
991 QualType CountType = Method->parameters()[2]->getType();
992 if (!CountType->isIntegerType()) {
993 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
994 << Sel;
995 Diag(Method->parameters()[2]->getLocation(),
996 diag::note_objc_literal_method_param)
997 << 2 << CountType
998 << "integral";
999 return ExprError();
1000 }
1001
1002 // We've found a good +dictionaryWithObjects:keys:count: method; save it!
1003 DictionaryWithObjectsMethod = Method;
1004 }
1005
1006 QualType ValuesT = DictionaryWithObjectsMethod->parameters()[0]->getType();
1007 QualType ValueT = ValuesT->castAs<PointerType>()->getPointeeType();
1008 QualType KeysT = DictionaryWithObjectsMethod->parameters()[1]->getType();
1009 QualType KeyT = KeysT->castAs<PointerType>()->getPointeeType();
1010
1011 // Check that each of the keys and values provided is valid in a collection
1012 // literal, performing conversions as necessary.
1013 bool HasPackExpansions = false;
1014 for (ObjCDictionaryElement &Element : Elements) {
1015 // Check the key.
1016 ExprResult Key = CheckObjCCollectionLiteralElement(*this, Element.Key,
1017 KeyT);
1018 if (Key.isInvalid())
1019 return ExprError();
1020
1021 // Check the value.
1022 ExprResult Value
1023 = CheckObjCCollectionLiteralElement(*this, Element.Value, ValueT);
1024 if (Value.isInvalid())
1025 return ExprError();
1026
1027 Element.Key = Key.get();
1028 Element.Value = Value.get();
1029
1030 if (Element.EllipsisLoc.isInvalid())
1031 continue;
1032
1033 if (!Element.Key->containsUnexpandedParameterPack() &&
1034 !Element.Value->containsUnexpandedParameterPack()) {
1035 Diag(Element.EllipsisLoc,
1036 diag::err_pack_expansion_without_parameter_packs)
1037 << SourceRange(Element.Key->getLocStart(),
1038 Element.Value->getLocEnd());
1039 return ExprError();
1040 }
1041
1042 HasPackExpansions = true;
1043 }
1044
1045 QualType Ty
1046 = Context.getObjCObjectPointerType(
1047 Context.getObjCInterfaceType(NSDictionaryDecl));
1048 return MaybeBindToTemporary(ObjCDictionaryLiteral::Create(
1049 Context, Elements, HasPackExpansions, Ty,
1050 DictionaryWithObjectsMethod, SR));
1051}
1052
1053ExprResult Sema::BuildObjCEncodeExpression(SourceLocation AtLoc,
1054 TypeSourceInfo *EncodedTypeInfo,
1055 SourceLocation RParenLoc) {
1056 QualType EncodedType = EncodedTypeInfo->getType();
1057 QualType StrTy;
1058 if (EncodedType->isDependentType())
1059 StrTy = Context.DependentTy;
1060 else {
1061 if (!EncodedType->getAsArrayTypeUnsafe() && //// Incomplete array is handled.
1062 !EncodedType->isVoidType()) // void is handled too.
1063 if (RequireCompleteType(AtLoc, EncodedType,
1064 diag::err_incomplete_type_objc_at_encode,
1065 EncodedTypeInfo->getTypeLoc()))
1066 return ExprError();
1067
1068 std::string Str;
1069 QualType NotEncodedT;
1070 Context.getObjCEncodingForType(EncodedType, Str, nullptr, &NotEncodedT);
1071 if (!NotEncodedT.isNull())
1072 Diag(AtLoc, diag::warn_incomplete_encoded_type)
1073 << EncodedType << NotEncodedT;
1074
1075 // The type of @encode is the same as the type of the corresponding string,
1076 // which is an array type.
1077 StrTy = Context.CharTy;
1078 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
1079 if (getLangOpts().CPlusPlus || getLangOpts().ConstStrings)
1080 StrTy.addConst();
1081 StrTy = Context.getConstantArrayType(StrTy, llvm::APInt(32, Str.size()+1),
1082 ArrayType::Normal, 0);
1083 }
1084
1085 return new (Context) ObjCEncodeExpr(StrTy, EncodedTypeInfo, AtLoc, RParenLoc);
1086}
1087
1088ExprResult Sema::ParseObjCEncodeExpression(SourceLocation AtLoc,
1089 SourceLocation EncodeLoc,
1090 SourceLocation LParenLoc,
1091 ParsedType ty,
1092 SourceLocation RParenLoc) {
1093 // FIXME: Preserve type source info ?
1094 TypeSourceInfo *TInfo;
1095 QualType EncodedType = GetTypeFromParser(ty, &TInfo);
1096 if (!TInfo)
1097 TInfo = Context.getTrivialTypeSourceInfo(EncodedType,
1098 getLocForEndOfToken(LParenLoc));
1099
1100 return BuildObjCEncodeExpression(AtLoc, TInfo, RParenLoc);
1101}
1102
1103static bool HelperToDiagnoseMismatchedMethodsInGlobalPool(Sema &S,
1104 SourceLocation AtLoc,
1105 SourceLocation LParenLoc,
1106 SourceLocation RParenLoc,
1107 ObjCMethodDecl *Method,
1108 ObjCMethodList &MethList) {
1109 ObjCMethodList *M = &MethList;
1110 bool Warned = false;
1111 for (M = M->getNext(); M; M=M->getNext()) {
1112 ObjCMethodDecl *MatchingMethodDecl = M->getMethod();
1113 if (MatchingMethodDecl == Method ||
1114 isa<ObjCImplDecl>(MatchingMethodDecl->getDeclContext()) ||
1115 MatchingMethodDecl->getSelector() != Method->getSelector())
1116 continue;
1117 if (!S.MatchTwoMethodDeclarations(Method,
1118 MatchingMethodDecl, Sema::MMS_loose)) {
1119 if (!Warned) {
1120 Warned = true;
1121 S.Diag(AtLoc, diag::warn_multiple_selectors)
1122 << Method->getSelector() << FixItHint::CreateInsertion(LParenLoc, "(")
1123 << FixItHint::CreateInsertion(RParenLoc, ")");
1124 S.Diag(Method->getLocation(), diag::note_method_declared_at)
1125 << Method->getDeclName();
1126 }
1127 S.Diag(MatchingMethodDecl->getLocation(), diag::note_method_declared_at)
1128 << MatchingMethodDecl->getDeclName();
1129 }
1130 }
1131 return Warned;
1132}
1133
1134static void DiagnoseMismatchedSelectors(Sema &S, SourceLocation AtLoc,
1135 ObjCMethodDecl *Method,
1136 SourceLocation LParenLoc,
1137 SourceLocation RParenLoc,
1138 bool WarnMultipleSelectors) {
1139 if (!WarnMultipleSelectors ||
1140 S.Diags.isIgnored(diag::warn_multiple_selectors, SourceLocation()))
1141 return;
1142 bool Warned = false;
1143 for (Sema::GlobalMethodPool::iterator b = S.MethodPool.begin(),
1144 e = S.MethodPool.end(); b != e; b++) {
1145 // first, instance methods
1146 ObjCMethodList &InstMethList = b->second.first;
1147 if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc,
1148 Method, InstMethList))
1149 Warned = true;
1150
1151 // second, class methods
1152 ObjCMethodList &ClsMethList = b->second.second;
1153 if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc,
1154 Method, ClsMethList) || Warned)
1155 return;
1156 }
1157}
1158
1159ExprResult Sema::ParseObjCSelectorExpression(Selector Sel,
1160 SourceLocation AtLoc,
1161 SourceLocation SelLoc,
1162 SourceLocation LParenLoc,
1163 SourceLocation RParenLoc,
1164 bool WarnMultipleSelectors) {
1165 ObjCMethodDecl *Method = LookupInstanceMethodInGlobalPool(Sel,
1166 SourceRange(LParenLoc, RParenLoc));
1167 if (!Method)
1168 Method = LookupFactoryMethodInGlobalPool(Sel,
1169 SourceRange(LParenLoc, RParenLoc));
1170 if (!Method) {
1171 if (const ObjCMethodDecl *OM = SelectorsForTypoCorrection(Sel)) {
1172 Selector MatchedSel = OM->getSelector();
1173 SourceRange SelectorRange(LParenLoc.getLocWithOffset(1),
1174 RParenLoc.getLocWithOffset(-1));
1175 Diag(SelLoc, diag::warn_undeclared_selector_with_typo)
1176 << Sel << MatchedSel
1177 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1178
1179 } else
1180 Diag(SelLoc, diag::warn_undeclared_selector) << Sel;
1181 } else
1182 DiagnoseMismatchedSelectors(*this, AtLoc, Method, LParenLoc, RParenLoc,
1183 WarnMultipleSelectors);
1184
1185 if (Method &&
1186 Method->getImplementationControl() != ObjCMethodDecl::Optional &&
1187 !getSourceManager().isInSystemHeader(Method->getLocation()))
1188 ReferencedSelectors.insert(std::make_pair(Sel, AtLoc));
1189
1190 // In ARC, forbid the user from using @selector for
1191 // retain/release/autorelease/dealloc/retainCount.
1192 if (getLangOpts().ObjCAutoRefCount) {
1193 switch (Sel.getMethodFamily()) {
1194 case OMF_retain:
1195 case OMF_release:
1196 case OMF_autorelease:
1197 case OMF_retainCount:
1198 case OMF_dealloc:
1199 Diag(AtLoc, diag::err_arc_illegal_selector) <<
1200 Sel << SourceRange(LParenLoc, RParenLoc);
1201 break;
1202
1203 case OMF_None:
1204 case OMF_alloc:
1205 case OMF_copy:
1206 case OMF_finalize:
1207 case OMF_init:
1208 case OMF_mutableCopy:
1209 case OMF_new:
1210 case OMF_self:
1211 case OMF_initialize:
1212 case OMF_performSelector:
1213 break;
1214 }
1215 }
1216 QualType Ty = Context.getObjCSelType();
1217 return new (Context) ObjCSelectorExpr(Ty, Sel, AtLoc, RParenLoc);
1218}
1219
1220ExprResult Sema::ParseObjCProtocolExpression(IdentifierInfo *ProtocolId,
1221 SourceLocation AtLoc,
1222 SourceLocation ProtoLoc,
1223 SourceLocation LParenLoc,
1224 SourceLocation ProtoIdLoc,
1225 SourceLocation RParenLoc) {
1226 ObjCProtocolDecl* PDecl = LookupProtocol(ProtocolId, ProtoIdLoc);
1227 if (!PDecl) {
1228 Diag(ProtoLoc, diag::err_undeclared_protocol) << ProtocolId;
1229 return true;
1230 }
1231 if (PDecl->hasDefinition())
1232 PDecl = PDecl->getDefinition();
1233
1234 QualType Ty = Context.getObjCProtoType();
1235 if (Ty.isNull())
1236 return true;
1237 Ty = Context.getObjCObjectPointerType(Ty);
1238 return new (Context) ObjCProtocolExpr(Ty, PDecl, AtLoc, ProtoIdLoc, RParenLoc);
1239}
1240
1241/// Try to capture an implicit reference to 'self'.
1242ObjCMethodDecl *Sema::tryCaptureObjCSelf(SourceLocation Loc) {
1243 DeclContext *DC = getFunctionLevelDeclContext();
1244
1245 // If we're not in an ObjC method, error out. Note that, unlike the
1246 // C++ case, we don't require an instance method --- class methods
1247 // still have a 'self', and we really do still need to capture it!
1248 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(DC);
1249 if (!method)
1250 return nullptr;
1251
1252 tryCaptureVariable(method->getSelfDecl(), Loc);
1253
1254 return method;
1255}
1256
1257static QualType stripObjCInstanceType(ASTContext &Context, QualType T) {
1258 QualType origType = T;
1259 if (auto nullability = AttributedType::stripOuterNullability(T)) {
1260 if (T == Context.getObjCInstanceType()) {
1261 return Context.getAttributedType(
1262 AttributedType::getNullabilityAttrKind(*nullability),
1263 Context.getObjCIdType(),
1264 Context.getObjCIdType());
1265 }
1266
1267 return origType;
1268 }
1269
1270 if (T == Context.getObjCInstanceType())
1271 return Context.getObjCIdType();
1272
1273 return origType;
1274}
1275
1276/// Determine the result type of a message send based on the receiver type,
1277/// method, and the kind of message send.
1278///
1279/// This is the "base" result type, which will still need to be adjusted
1280/// to account for nullability.
1281static QualType getBaseMessageSendResultType(Sema &S,
1282 QualType ReceiverType,
1283 ObjCMethodDecl *Method,
1284 bool isClassMessage,
1285 bool isSuperMessage) {
1286 assert(Method && "Must have a method")(static_cast <bool> (Method && "Must have a method"
) ? void (0) : __assert_fail ("Method && \"Must have a method\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 1286, __extension__ __PRETTY_FUNCTION__))
;
1287 if (!Method->hasRelatedResultType())
1288 return Method->getSendResultType(ReceiverType);
1289
1290 ASTContext &Context = S.Context;
1291
1292 // Local function that transfers the nullability of the method's
1293 // result type to the returned result.
1294 auto transferNullability = [&](QualType type) -> QualType {
1295 // If the method's result type has nullability, extract it.
1296 if (auto nullability = Method->getSendResultType(ReceiverType)
1297 ->getNullability(Context)){
1298 // Strip off any outer nullability sugar from the provided type.
1299 (void)AttributedType::stripOuterNullability(type);
1300
1301 // Form a new attributed type using the method result type's nullability.
1302 return Context.getAttributedType(
1303 AttributedType::getNullabilityAttrKind(*nullability),
1304 type,
1305 type);
1306 }
1307
1308 return type;
1309 };
1310
1311 // If a method has a related return type:
1312 // - if the method found is an instance method, but the message send
1313 // was a class message send, T is the declared return type of the method
1314 // found
1315 if (Method->isInstanceMethod() && isClassMessage)
1316 return stripObjCInstanceType(Context,
1317 Method->getSendResultType(ReceiverType));
1318
1319 // - if the receiver is super, T is a pointer to the class of the
1320 // enclosing method definition
1321 if (isSuperMessage) {
1322 if (ObjCMethodDecl *CurMethod = S.getCurMethodDecl())
1323 if (ObjCInterfaceDecl *Class = CurMethod->getClassInterface()) {
1324 return transferNullability(
1325 Context.getObjCObjectPointerType(
1326 Context.getObjCInterfaceType(Class)));
1327 }
1328 }
1329
1330 // - if the receiver is the name of a class U, T is a pointer to U
1331 if (ReceiverType->getAsObjCInterfaceType())
1332 return transferNullability(Context.getObjCObjectPointerType(ReceiverType));
1333 // - if the receiver is of type Class or qualified Class type,
1334 // T is the declared return type of the method.
1335 if (ReceiverType->isObjCClassType() ||
1336 ReceiverType->isObjCQualifiedClassType())
1337 return stripObjCInstanceType(Context,
1338 Method->getSendResultType(ReceiverType));
1339
1340 // - if the receiver is id, qualified id, Class, or qualified Class, T
1341 // is the receiver type, otherwise
1342 // - T is the type of the receiver expression.
1343 return transferNullability(ReceiverType);
1344}
1345
1346QualType Sema::getMessageSendResultType(QualType ReceiverType,
1347 ObjCMethodDecl *Method,
1348 bool isClassMessage,
1349 bool isSuperMessage) {
1350 // Produce the result type.
1351 QualType resultType = getBaseMessageSendResultType(*this, ReceiverType,
1352 Method,
1353 isClassMessage,
1354 isSuperMessage);
1355
1356 // If this is a class message, ignore the nullability of the receiver.
1357 if (isClassMessage)
1358 return resultType;
1359
1360 // Map the nullability of the result into a table index.
1361 unsigned receiverNullabilityIdx = 0;
1362 if (auto nullability = ReceiverType->getNullability(Context))
1363 receiverNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1364
1365 unsigned resultNullabilityIdx = 0;
1366 if (auto nullability = resultType->getNullability(Context))
1367 resultNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1368
1369 // The table of nullability mappings, indexed by the receiver's nullability
1370 // and then the result type's nullability.
1371 static const uint8_t None = 0;
1372 static const uint8_t NonNull = 1;
1373 static const uint8_t Nullable = 2;
1374 static const uint8_t Unspecified = 3;
1375 static const uint8_t nullabilityMap[4][4] = {
1376 // None NonNull Nullable Unspecified
1377 /* None */ { None, None, Nullable, None },
1378 /* NonNull */ { None, NonNull, Nullable, Unspecified },
1379 /* Nullable */ { Nullable, Nullable, Nullable, Nullable },
1380 /* Unspecified */ { None, Unspecified, Nullable, Unspecified }
1381 };
1382
1383 unsigned newResultNullabilityIdx
1384 = nullabilityMap[receiverNullabilityIdx][resultNullabilityIdx];
1385 if (newResultNullabilityIdx == resultNullabilityIdx)
1386 return resultType;
1387
1388 // Strip off the existing nullability. This removes as little type sugar as
1389 // possible.
1390 do {
1391 if (auto attributed = dyn_cast<AttributedType>(resultType.getTypePtr())) {
1392 resultType = attributed->getModifiedType();
1393 } else {
1394 resultType = resultType.getDesugaredType(Context);
1395 }
1396 } while (resultType->getNullability(Context));
1397
1398 // Add nullability back if needed.
1399 if (newResultNullabilityIdx > 0) {
1400 auto newNullability
1401 = static_cast<NullabilityKind>(newResultNullabilityIdx-1);
1402 return Context.getAttributedType(
1403 AttributedType::getNullabilityAttrKind(newNullability),
1404 resultType, resultType);
1405 }
1406
1407 return resultType;
1408}
1409
1410/// Look for an ObjC method whose result type exactly matches the given type.
1411static const ObjCMethodDecl *
1412findExplicitInstancetypeDeclarer(const ObjCMethodDecl *MD,
1413 QualType instancetype) {
1414 if (MD->getReturnType() == instancetype)
1415 return MD;
1416
1417 // For these purposes, a method in an @implementation overrides a
1418 // declaration in the @interface.
1419 if (const ObjCImplDecl *impl =
1420 dyn_cast<ObjCImplDecl>(MD->getDeclContext())) {
1421 const ObjCContainerDecl *iface;
1422 if (const ObjCCategoryImplDecl *catImpl =
1423 dyn_cast<ObjCCategoryImplDecl>(impl)) {
1424 iface = catImpl->getCategoryDecl();
1425 } else {
1426 iface = impl->getClassInterface();
1427 }
1428
1429 const ObjCMethodDecl *ifaceMD =
1430 iface->getMethod(MD->getSelector(), MD->isInstanceMethod());
1431 if (ifaceMD) return findExplicitInstancetypeDeclarer(ifaceMD, instancetype);
1432 }
1433
1434 SmallVector<const ObjCMethodDecl *, 4> overrides;
1435 MD->getOverriddenMethods(overrides);
1436 for (unsigned i = 0, e = overrides.size(); i != e; ++i) {
1437 if (const ObjCMethodDecl *result =
1438 findExplicitInstancetypeDeclarer(overrides[i], instancetype))
1439 return result;
1440 }
1441
1442 return nullptr;
1443}
1444
1445void Sema::EmitRelatedResultTypeNoteForReturn(QualType destType) {
1446 // Only complain if we're in an ObjC method and the required return
1447 // type doesn't match the method's declared return type.
1448 ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurContext);
1449 if (!MD || !MD->hasRelatedResultType() ||
1450 Context.hasSameUnqualifiedType(destType, MD->getReturnType()))
1451 return;
1452
1453 // Look for a method overridden by this method which explicitly uses
1454 // 'instancetype'.
1455 if (const ObjCMethodDecl *overridden =
1456 findExplicitInstancetypeDeclarer(MD, Context.getObjCInstanceType())) {
1457 SourceRange range = overridden->getReturnTypeSourceRange();
1458 SourceLocation loc = range.getBegin();
1459 if (loc.isInvalid())
1460 loc = overridden->getLocation();
1461 Diag(loc, diag::note_related_result_type_explicit)
1462 << /*current method*/ 1 << range;
1463 return;
1464 }
1465
1466 // Otherwise, if we have an interesting method family, note that.
1467 // This should always trigger if the above didn't.
1468 if (ObjCMethodFamily family = MD->getMethodFamily())
1469 Diag(MD->getLocation(), diag::note_related_result_type_family)
1470 << /*current method*/ 1
1471 << family;
1472}
1473
1474void Sema::EmitRelatedResultTypeNote(const Expr *E) {
1475 E = E->IgnoreParenImpCasts();
1476 const ObjCMessageExpr *MsgSend = dyn_cast<ObjCMessageExpr>(E);
1477 if (!MsgSend)
1478 return;
1479
1480 const ObjCMethodDecl *Method = MsgSend->getMethodDecl();
1481 if (!Method)
1482 return;
1483
1484 if (!Method->hasRelatedResultType())
1485 return;
1486
1487 if (Context.hasSameUnqualifiedType(
1488 Method->getReturnType().getNonReferenceType(), MsgSend->getType()))
1489 return;
1490
1491 if (!Context.hasSameUnqualifiedType(Method->getReturnType(),
1492 Context.getObjCInstanceType()))
1493 return;
1494
1495 Diag(Method->getLocation(), diag::note_related_result_type_inferred)
1496 << Method->isInstanceMethod() << Method->getSelector()
1497 << MsgSend->getType();
1498}
1499
1500bool Sema::CheckMessageArgumentTypes(QualType ReceiverType,
1501 MultiExprArg Args,
1502 Selector Sel,
1503 ArrayRef<SourceLocation> SelectorLocs,
1504 ObjCMethodDecl *Method,
1505 bool isClassMessage, bool isSuperMessage,
1506 SourceLocation lbrac, SourceLocation rbrac,
1507 SourceRange RecRange,
1508 QualType &ReturnType, ExprValueKind &VK) {
1509 SourceLocation SelLoc;
1510 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
1511 SelLoc = SelectorLocs.front();
1512 else
1513 SelLoc = lbrac;
1514
1515 if (!Method) {
1516 // Apply default argument promotion as for (C99 6.5.2.2p6).
1517 for (unsigned i = 0, e = Args.size(); i != e; i++) {
1518 if (Args[i]->isTypeDependent())
1519 continue;
1520
1521 ExprResult result;
1522 if (getLangOpts().DebuggerSupport) {
1523 QualType paramTy; // ignored
1524 result = checkUnknownAnyArg(SelLoc, Args[i], paramTy);
1525 } else {
1526 result = DefaultArgumentPromotion(Args[i]);
1527 }
1528 if (result.isInvalid())
1529 return true;
1530 Args[i] = result.get();
1531 }
1532
1533 unsigned DiagID;
1534 if (getLangOpts().ObjCAutoRefCount)
1535 DiagID = diag::err_arc_method_not_found;
1536 else
1537 DiagID = isClassMessage ? diag::warn_class_method_not_found
1538 : diag::warn_inst_method_not_found;
1539 if (!getLangOpts().DebuggerSupport) {
1540 const ObjCMethodDecl *OMD = SelectorsForTypoCorrection(Sel, ReceiverType);
1541 if (OMD && !OMD->isInvalidDecl()) {
1542 if (getLangOpts().ObjCAutoRefCount)
1543 DiagID = diag::err_method_not_found_with_typo;
1544 else
1545 DiagID = isClassMessage ? diag::warn_class_method_not_found_with_typo
1546 : diag::warn_instance_method_not_found_with_typo;
1547 Selector MatchedSel = OMD->getSelector();
1548 SourceRange SelectorRange(SelectorLocs.front(), SelectorLocs.back());
1549 if (MatchedSel.isUnarySelector())
1550 Diag(SelLoc, DiagID)
1551 << Sel<< isClassMessage << MatchedSel
1552 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1553 else
1554 Diag(SelLoc, DiagID) << Sel<< isClassMessage << MatchedSel;
1555 }
1556 else
1557 Diag(SelLoc, DiagID)
1558 << Sel << isClassMessage << SourceRange(SelectorLocs.front(),
1559 SelectorLocs.back());
1560 // Find the class to which we are sending this message.
1561 if (ReceiverType->isObjCObjectPointerType()) {
1562 if (ObjCInterfaceDecl *ThisClass =
1563 ReceiverType->getAs<ObjCObjectPointerType>()->getInterfaceDecl()) {
1564 Diag(ThisClass->getLocation(), diag::note_receiver_class_declared);
1565 if (!RecRange.isInvalid())
1566 if (ThisClass->lookupClassMethod(Sel))
1567 Diag(RecRange.getBegin(),diag::note_receiver_expr_here)
1568 << FixItHint::CreateReplacement(RecRange,
1569 ThisClass->getNameAsString());
1570 }
1571 }
1572 }
1573
1574 // In debuggers, we want to use __unknown_anytype for these
1575 // results so that clients can cast them.
1576 if (getLangOpts().DebuggerSupport) {
1577 ReturnType = Context.UnknownAnyTy;
1578 } else {
1579 ReturnType = Context.getObjCIdType();
1580 }
1581 VK = VK_RValue;
1582 return false;
1583 }
1584
1585 ReturnType = getMessageSendResultType(ReceiverType, Method, isClassMessage,
1586 isSuperMessage);
1587 VK = Expr::getValueKindForType(Method->getReturnType());
1588
1589 unsigned NumNamedArgs = Sel.getNumArgs();
1590 // Method might have more arguments than selector indicates. This is due
1591 // to addition of c-style arguments in method.
1592 if (Method->param_size() > Sel.getNumArgs())
1593 NumNamedArgs = Method->param_size();
1594 // FIXME. This need be cleaned up.
1595 if (Args.size() < NumNamedArgs) {
1596 Diag(SelLoc, diag::err_typecheck_call_too_few_args)
1597 << 2 << NumNamedArgs << static_cast<unsigned>(Args.size());
1598 return false;
1599 }
1600
1601 // Compute the set of type arguments to be substituted into each parameter
1602 // type.
1603 Optional<ArrayRef<QualType>> typeArgs
1604 = ReceiverType->getObjCSubstitutions(Method->getDeclContext());
1605 bool IsError = false;
1606 for (unsigned i = 0; i < NumNamedArgs; i++) {
1607 // We can't do any type-checking on a type-dependent argument.
1608 if (Args[i]->isTypeDependent())
1609 continue;
1610
1611 Expr *argExpr = Args[i];
1612
1613 ParmVarDecl *param = Method->parameters()[i];
1614 assert(argExpr && "CheckMessageArgumentTypes(): missing expression")(static_cast <bool> (argExpr && "CheckMessageArgumentTypes(): missing expression"
) ? void (0) : __assert_fail ("argExpr && \"CheckMessageArgumentTypes(): missing expression\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 1614, __extension__ __PRETTY_FUNCTION__))
;
1615
1616 // Strip the unbridged-cast placeholder expression off unless it's
1617 // a consumed argument.
1618 if (argExpr->hasPlaceholderType(BuiltinType::ARCUnbridgedCast) &&
1619 !param->hasAttr<CFConsumedAttr>())
1620 argExpr = stripARCUnbridgedCast(argExpr);
1621
1622 // If the parameter is __unknown_anytype, infer its type
1623 // from the argument.
1624 if (param->getType() == Context.UnknownAnyTy) {
1625 QualType paramType;
1626 ExprResult argE = checkUnknownAnyArg(SelLoc, argExpr, paramType);
1627 if (argE.isInvalid()) {
1628 IsError = true;
1629 } else {
1630 Args[i] = argE.get();
1631
1632 // Update the parameter type in-place.
1633 param->setType(paramType);
1634 }
1635 continue;
1636 }
1637
1638 QualType origParamType = param->getType();
1639 QualType paramType = param->getType();
1640 if (typeArgs)
1641 paramType = paramType.substObjCTypeArgs(
1642 Context,
1643 *typeArgs,
1644 ObjCSubstitutionContext::Parameter);
1645
1646 if (RequireCompleteType(argExpr->getSourceRange().getBegin(),
1647 paramType,
1648 diag::err_call_incomplete_argument, argExpr))
1649 return true;
1650
1651 InitializedEntity Entity
1652 = InitializedEntity::InitializeParameter(Context, param, paramType);
1653 ExprResult ArgE = PerformCopyInitialization(Entity, SourceLocation(), argExpr);
1654 if (ArgE.isInvalid())
1655 IsError = true;
1656 else {
1657 Args[i] = ArgE.getAs<Expr>();
1658
1659 // If we are type-erasing a block to a block-compatible
1660 // Objective-C pointer type, we may need to extend the lifetime
1661 // of the block object.
1662 if (typeArgs && Args[i]->isRValue() && paramType->isBlockPointerType() &&
1663 Args[i]->getType()->isBlockPointerType() &&
1664 origParamType->isObjCObjectPointerType()) {
1665 ExprResult arg = Args[i];
1666 maybeExtendBlockObject(arg);
1667 Args[i] = arg.get();
1668 }
1669 }
1670 }
1671
1672 // Promote additional arguments to variadic methods.
1673 if (Method->isVariadic()) {
1674 for (unsigned i = NumNamedArgs, e = Args.size(); i < e; ++i) {
1675 if (Args[i]->isTypeDependent())
1676 continue;
1677
1678 ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], VariadicMethod,
1679 nullptr);
1680 IsError |= Arg.isInvalid();
1681 Args[i] = Arg.get();
1682 }
1683 } else {
1684 // Check for extra arguments to non-variadic methods.
1685 if (Args.size() != NumNamedArgs) {
1686 Diag(Args[NumNamedArgs]->getLocStart(),
1687 diag::err_typecheck_call_too_many_args)
1688 << 2 /*method*/ << NumNamedArgs << static_cast<unsigned>(Args.size())
1689 << Method->getSourceRange()
1690 << SourceRange(Args[NumNamedArgs]->getLocStart(),
1691 Args.back()->getLocEnd());
1692 }
1693 }
1694
1695 DiagnoseSentinelCalls(Method, SelLoc, Args);
1696
1697 // Do additional checkings on method.
1698 IsError |= CheckObjCMethodCall(
1699 Method, SelLoc, makeArrayRef(Args.data(), Args.size()));
1700
1701 return IsError;
1702}
1703
1704bool Sema::isSelfExpr(Expr *RExpr) {
1705 // 'self' is objc 'self' in an objc method only.
1706 ObjCMethodDecl *Method =
1707 dyn_cast_or_null<ObjCMethodDecl>(CurContext->getNonClosureAncestor());
1708 return isSelfExpr(RExpr, Method);
1709}
1710
1711bool Sema::isSelfExpr(Expr *receiver, const ObjCMethodDecl *method) {
1712 if (!method) return false;
1713
1714 receiver = receiver->IgnoreParenLValueCasts();
1715 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(receiver))
1716 if (DRE->getDecl() == method->getSelfDecl())
1717 return true;
1718 return false;
1719}
1720
1721/// LookupMethodInType - Look up a method in an ObjCObjectType.
1722ObjCMethodDecl *Sema::LookupMethodInObjectType(Selector sel, QualType type,
1723 bool isInstance) {
1724 const ObjCObjectType *objType = type->castAs<ObjCObjectType>();
1725 if (ObjCInterfaceDecl *iface = objType->getInterface()) {
1726 // Look it up in the main interface (and categories, etc.)
1727 if (ObjCMethodDecl *method = iface->lookupMethod(sel, isInstance))
1728 return method;
1729
1730 // Okay, look for "private" methods declared in any
1731 // @implementations we've seen.
1732 if (ObjCMethodDecl *method = iface->lookupPrivateMethod(sel, isInstance))
1733 return method;
1734 }
1735
1736 // Check qualifiers.
1737 for (const auto *I : objType->quals())
1738 if (ObjCMethodDecl *method = I->lookupMethod(sel, isInstance))
1739 return method;
1740
1741 return nullptr;
1742}
1743
1744/// LookupMethodInQualifiedType - Lookups up a method in protocol qualifier
1745/// list of a qualified objective pointer type.
1746ObjCMethodDecl *Sema::LookupMethodInQualifiedType(Selector Sel,
1747 const ObjCObjectPointerType *OPT,
1748 bool Instance)
1749{
1750 ObjCMethodDecl *MD = nullptr;
1751 for (const auto *PROTO : OPT->quals()) {
1752 if ((MD = PROTO->lookupMethod(Sel, Instance))) {
1753 return MD;
1754 }
1755 }
1756 return nullptr;
1757}
1758
1759/// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an
1760/// objective C interface. This is a property reference expression.
1761ExprResult Sema::
1762HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT,
1763 Expr *BaseExpr, SourceLocation OpLoc,
1764 DeclarationName MemberName,
1765 SourceLocation MemberLoc,
1766 SourceLocation SuperLoc, QualType SuperType,
1767 bool Super) {
1768 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType();
1769 ObjCInterfaceDecl *IFace = IFaceT->getDecl();
1770
1771 if (!MemberName.isIdentifier()) {
1772 Diag(MemberLoc, diag::err_invalid_property_name)
1773 << MemberName << QualType(OPT, 0);
1774 return ExprError();
1775 }
1776
1777 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
1778
1779 SourceRange BaseRange = Super? SourceRange(SuperLoc)
1780 : BaseExpr->getSourceRange();
1781 if (RequireCompleteType(MemberLoc, OPT->getPointeeType(),
1782 diag::err_property_not_found_forward_class,
1783 MemberName, BaseRange))
1784 return ExprError();
1785
1786 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(
1787 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1788 // Check whether we can reference this property.
1789 if (DiagnoseUseOfDecl(PD, MemberLoc))
1790 return ExprError();
1791 if (Super)
1792 return new (Context)
1793 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1794 OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1795 else
1796 return new (Context)
1797 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1798 OK_ObjCProperty, MemberLoc, BaseExpr);
1799 }
1800 // Check protocols on qualified interfaces.
1801 for (const auto *I : OPT->quals())
1802 if (ObjCPropertyDecl *PD = I->FindPropertyDeclaration(
1803 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1804 // Check whether we can reference this property.
1805 if (DiagnoseUseOfDecl(PD, MemberLoc))
1806 return ExprError();
1807
1808 if (Super)
1809 return new (Context) ObjCPropertyRefExpr(
1810 PD, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty, MemberLoc,
1811 SuperLoc, SuperType);
1812 else
1813 return new (Context)
1814 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1815 OK_ObjCProperty, MemberLoc, BaseExpr);
1816 }
1817 // If that failed, look for an "implicit" property by seeing if the nullary
1818 // selector is implemented.
1819
1820 // FIXME: The logic for looking up nullary and unary selectors should be
1821 // shared with the code in ActOnInstanceMessage.
1822
1823 Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
1824 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
1825
1826 // May be found in property's qualified list.
1827 if (!Getter)
1828 Getter = LookupMethodInQualifiedType(Sel, OPT, true);
1829
1830 // If this reference is in an @implementation, check for 'private' methods.
1831 if (!Getter)
1832 Getter = IFace->lookupPrivateMethod(Sel);
1833
1834 if (Getter) {
1835 // Check if we can reference this property.
1836 if (DiagnoseUseOfDecl(Getter, MemberLoc))
1837 return ExprError();
1838 }
1839 // If we found a getter then this may be a valid dot-reference, we
1840 // will look for the matching setter, in case it is needed.
1841 Selector SetterSel =
1842 SelectorTable::constructSetterSelector(PP.getIdentifierTable(),
1843 PP.getSelectorTable(), Member);
1844 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel);
1845
1846 // May be found in property's qualified list.
1847 if (!Setter)
1848 Setter = LookupMethodInQualifiedType(SetterSel, OPT, true);
1849
1850 if (!Setter) {
1851 // If this reference is in an @implementation, also check for 'private'
1852 // methods.
1853 Setter = IFace->lookupPrivateMethod(SetterSel);
1854 }
1855
1856 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc))
1857 return ExprError();
1858
1859 // Special warning if member name used in a property-dot for a setter accessor
1860 // does not use a property with same name; e.g. obj.X = ... for a property with
1861 // name 'x'.
1862 if (Setter && Setter->isImplicit() && Setter->isPropertyAccessor() &&
1863 !IFace->FindPropertyDeclaration(
1864 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1865 if (const ObjCPropertyDecl *PDecl = Setter->findPropertyDecl()) {
1866 // Do not warn if user is using property-dot syntax to make call to
1867 // user named setter.
1868 if (!(PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter))
1869 Diag(MemberLoc,
1870 diag::warn_property_access_suggest)
1871 << MemberName << QualType(OPT, 0) << PDecl->getName()
1872 << FixItHint::CreateReplacement(MemberLoc, PDecl->getName());
1873 }
1874 }
1875
1876 if (Getter || Setter) {
1877 if (Super)
1878 return new (Context)
1879 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1880 OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1881 else
1882 return new (Context)
1883 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1884 OK_ObjCProperty, MemberLoc, BaseExpr);
1885
1886 }
1887
1888 // Attempt to correct for typos in property names.
1889 if (TypoCorrection Corrected =
1890 CorrectTypo(DeclarationNameInfo(MemberName, MemberLoc),
1891 LookupOrdinaryName, nullptr, nullptr,
1892 llvm::make_unique<DeclFilterCCC<ObjCPropertyDecl>>(),
1893 CTK_ErrorRecovery, IFace, false, OPT)) {
1894 DeclarationName TypoResult = Corrected.getCorrection();
1895 if (TypoResult.isIdentifier() &&
1896 TypoResult.getAsIdentifierInfo() == Member) {
1897 // There is no need to try the correction if it is the same.
1898 NamedDecl *ChosenDecl =
1899 Corrected.isKeyword() ? nullptr : Corrected.getFoundDecl();
1900 if (ChosenDecl && isa<ObjCPropertyDecl>(ChosenDecl))
1901 if (cast<ObjCPropertyDecl>(ChosenDecl)->isClassProperty()) {
1902 // This is a class property, we should not use the instance to
1903 // access it.
1904 Diag(MemberLoc, diag::err_class_property_found) << MemberName
1905 << OPT->getInterfaceDecl()->getName()
1906 << FixItHint::CreateReplacement(BaseExpr->getSourceRange(),
1907 OPT->getInterfaceDecl()->getName());
1908 return ExprError();
1909 }
1910 } else {
1911 diagnoseTypo(Corrected, PDiag(diag::err_property_not_found_suggest)
1912 << MemberName << QualType(OPT, 0));
1913 return HandleExprPropertyRefExpr(OPT, BaseExpr, OpLoc,
1914 TypoResult, MemberLoc,
1915 SuperLoc, SuperType, Super);
1916 }
1917 }
1918 ObjCInterfaceDecl *ClassDeclared;
1919 if (ObjCIvarDecl *Ivar =
1920 IFace->lookupInstanceVariable(Member, ClassDeclared)) {
1921 QualType T = Ivar->getType();
1922 if (const ObjCObjectPointerType * OBJPT =
1923 T->getAsObjCInterfacePointerType()) {
1924 if (RequireCompleteType(MemberLoc, OBJPT->getPointeeType(),
1925 diag::err_property_not_as_forward_class,
1926 MemberName, BaseExpr))
1927 return ExprError();
1928 }
1929 Diag(MemberLoc,
1930 diag::err_ivar_access_using_property_syntax_suggest)
1931 << MemberName << QualType(OPT, 0) << Ivar->getDeclName()
1932 << FixItHint::CreateReplacement(OpLoc, "->");
1933 return ExprError();
1934 }
1935
1936 Diag(MemberLoc, diag::err_property_not_found)
1937 << MemberName << QualType(OPT, 0);
1938 if (Setter)
1939 Diag(Setter->getLocation(), diag::note_getter_unavailable)
1940 << MemberName << BaseExpr->getSourceRange();
1941 return ExprError();
1942}
1943
1944ExprResult Sema::
1945ActOnClassPropertyRefExpr(IdentifierInfo &receiverName,
1946 IdentifierInfo &propertyName,
1947 SourceLocation receiverNameLoc,
1948 SourceLocation propertyNameLoc) {
1949
1950 IdentifierInfo *receiverNamePtr = &receiverName;
1951 ObjCInterfaceDecl *IFace = getObjCInterfaceDecl(receiverNamePtr,
1952 receiverNameLoc);
1953
1954 QualType SuperType;
1955 if (!IFace) {
1956 // If the "receiver" is 'super' in a method, handle it as an expression-like
1957 // property reference.
1958 if (receiverNamePtr->isStr("super")) {
1959 if (ObjCMethodDecl *CurMethod = tryCaptureObjCSelf(receiverNameLoc)) {
1960 if (auto classDecl = CurMethod->getClassInterface()) {
1961 SuperType = QualType(classDecl->getSuperClassType(), 0);
1962 if (CurMethod->isInstanceMethod()) {
1963 if (SuperType.isNull()) {
1964 // The current class does not have a superclass.
1965 Diag(receiverNameLoc, diag::err_root_class_cannot_use_super)
1966 << CurMethod->getClassInterface()->getIdentifier();
1967 return ExprError();
1968 }
1969 QualType T = Context.getObjCObjectPointerType(SuperType);
1970
1971 return HandleExprPropertyRefExpr(T->castAs<ObjCObjectPointerType>(),
1972 /*BaseExpr*/nullptr,
1973 SourceLocation()/*OpLoc*/,
1974 &propertyName,
1975 propertyNameLoc,
1976 receiverNameLoc, T, true);
1977 }
1978
1979 // Otherwise, if this is a class method, try dispatching to our
1980 // superclass.
1981 IFace = CurMethod->getClassInterface()->getSuperClass();
1982 }
1983 }
1984 }
1985
1986 if (!IFace) {
1987 Diag(receiverNameLoc, diag::err_expected_either) << tok::identifier
1988 << tok::l_paren;
1989 return ExprError();
1990 }
1991 }
1992
1993 Selector GetterSel;
1994 Selector SetterSel;
1995 if (auto PD = IFace->FindPropertyDeclaration(
1996 &propertyName, ObjCPropertyQueryKind::OBJC_PR_query_class)) {
1997 GetterSel = PD->getGetterName();
1998 SetterSel = PD->getSetterName();
1999 } else {
2000 GetterSel = PP.getSelectorTable().getNullarySelector(&propertyName);
2001 SetterSel = SelectorTable::constructSetterSelector(
2002 PP.getIdentifierTable(), PP.getSelectorTable(), &propertyName);
2003 }
2004
2005 // Search for a declared property first.
2006 ObjCMethodDecl *Getter = IFace->lookupClassMethod(GetterSel);
2007
2008 // If this reference is in an @implementation, check for 'private' methods.
2009 if (!Getter)
2010 Getter = IFace->lookupPrivateClassMethod(GetterSel);
2011
2012 if (Getter) {
2013 // FIXME: refactor/share with ActOnMemberReference().
2014 // Check if we can reference this property.
2015 if (DiagnoseUseOfDecl(Getter, propertyNameLoc))
2016 return ExprError();
2017 }
2018
2019 // Look for the matching setter, in case it is needed.
2020 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel);
2021 if (!Setter) {
2022 // If this reference is in an @implementation, also check for 'private'
2023 // methods.
2024 Setter = IFace->lookupPrivateClassMethod(SetterSel);
2025 }
2026 // Look through local category implementations associated with the class.
2027 if (!Setter)
2028 Setter = IFace->getCategoryClassMethod(SetterSel);
2029
2030 if (Setter && DiagnoseUseOfDecl(Setter, propertyNameLoc))
2031 return ExprError();
2032
2033 if (Getter || Setter) {
2034 if (!SuperType.isNull())
2035 return new (Context)
2036 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
2037 OK_ObjCProperty, propertyNameLoc, receiverNameLoc,
2038 SuperType);
2039
2040 return new (Context) ObjCPropertyRefExpr(
2041 Getter, Setter, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty,
2042 propertyNameLoc, receiverNameLoc, IFace);
2043 }
2044 return ExprError(Diag(propertyNameLoc, diag::err_property_not_found)
2045 << &propertyName << Context.getObjCInterfaceType(IFace));
2046}
2047
2048namespace {
2049
2050class ObjCInterfaceOrSuperCCC : public CorrectionCandidateCallback {
2051 public:
2052 ObjCInterfaceOrSuperCCC(ObjCMethodDecl *Method) {
2053 // Determine whether "super" is acceptable in the current context.
2054 if (Method && Method->getClassInterface())
2055 WantObjCSuper = Method->getClassInterface()->getSuperClass();
2056 }
2057
2058 bool ValidateCandidate(const TypoCorrection &candidate) override {
2059 return candidate.getCorrectionDeclAs<ObjCInterfaceDecl>() ||
2060 candidate.isKeyword("super");
2061 }
2062};
2063
2064} // end anonymous namespace
2065
2066Sema::ObjCMessageKind Sema::getObjCMessageKind(Scope *S,
2067 IdentifierInfo *Name,
2068 SourceLocation NameLoc,
2069 bool IsSuper,
2070 bool HasTrailingDot,
2071 ParsedType &ReceiverType) {
2072 ReceiverType = nullptr;
2073
2074 // If the identifier is "super" and there is no trailing dot, we're
2075 // messaging super. If the identifier is "super" and there is a
2076 // trailing dot, it's an instance message.
2077 if (IsSuper && S->isInObjcMethodScope())
2078 return HasTrailingDot? ObjCInstanceMessage : ObjCSuperMessage;
2079
2080 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName);
2081 LookupName(Result, S);
2082
2083 switch (Result.getResultKind()) {
2084 case LookupResult::NotFound:
2085 // Normal name lookup didn't find anything. If we're in an
2086 // Objective-C method, look for ivars. If we find one, we're done!
2087 // FIXME: This is a hack. Ivar lookup should be part of normal
2088 // lookup.
2089 if (ObjCMethodDecl *Method = getCurMethodDecl()) {
2090 if (!Method->getClassInterface()) {
2091 // Fall back: let the parser try to parse it as an instance message.
2092 return ObjCInstanceMessage;
2093 }
2094
2095 ObjCInterfaceDecl *ClassDeclared;
2096 if (Method->getClassInterface()->lookupInstanceVariable(Name,
2097 ClassDeclared))
2098 return ObjCInstanceMessage;
2099 }
2100
2101 // Break out; we'll perform typo correction below.
2102 break;
2103
2104 case LookupResult::NotFoundInCurrentInstantiation:
2105 case LookupResult::FoundOverloaded:
2106 case LookupResult::FoundUnresolvedValue:
2107 case LookupResult::Ambiguous:
2108 Result.suppressDiagnostics();
2109 return ObjCInstanceMessage;
2110
2111 case LookupResult::Found: {
2112 // If the identifier is a class or not, and there is a trailing dot,
2113 // it's an instance message.
2114 if (HasTrailingDot)
2115 return ObjCInstanceMessage;
2116 // We found something. If it's a type, then we have a class
2117 // message. Otherwise, it's an instance message.
2118 NamedDecl *ND = Result.getFoundDecl();
2119 QualType T;
2120 if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND))
2121 T = Context.getObjCInterfaceType(Class);
2122 else if (TypeDecl *Type = dyn_cast<TypeDecl>(ND)) {
2123 T = Context.getTypeDeclType(Type);
2124 DiagnoseUseOfDecl(Type, NameLoc);
2125 }
2126 else
2127 return ObjCInstanceMessage;
2128
2129 // We have a class message, and T is the type we're
2130 // messaging. Build source-location information for it.
2131 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2132 ReceiverType = CreateParsedType(T, TSInfo);
2133 return ObjCClassMessage;
2134 }
2135 }
2136
2137 if (TypoCorrection Corrected = CorrectTypo(
2138 Result.getLookupNameInfo(), Result.getLookupKind(), S, nullptr,
2139 llvm::make_unique<ObjCInterfaceOrSuperCCC>(getCurMethodDecl()),
2140 CTK_ErrorRecovery, nullptr, false, nullptr, false)) {
2141 if (Corrected.isKeyword()) {
2142 // If we've found the keyword "super" (the only keyword that would be
2143 // returned by CorrectTypo), this is a send to super.
2144 diagnoseTypo(Corrected,
2145 PDiag(diag::err_unknown_receiver_suggest) << Name);
2146 return ObjCSuperMessage;
2147 } else if (ObjCInterfaceDecl *Class =
2148 Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>()) {
2149 // If we found a declaration, correct when it refers to an Objective-C
2150 // class.
2151 diagnoseTypo(Corrected,
2152 PDiag(diag::err_unknown_receiver_suggest) << Name);
2153 QualType T = Context.getObjCInterfaceType(Class);
2154 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2155 ReceiverType = CreateParsedType(T, TSInfo);
2156 return ObjCClassMessage;
2157 }
2158 }
2159
2160 // Fall back: let the parser try to parse it as an instance message.
2161 return ObjCInstanceMessage;
2162}
2163
2164ExprResult Sema::ActOnSuperMessage(Scope *S,
2165 SourceLocation SuperLoc,
2166 Selector Sel,
2167 SourceLocation LBracLoc,
2168 ArrayRef<SourceLocation> SelectorLocs,
2169 SourceLocation RBracLoc,
2170 MultiExprArg Args) {
2171 // Determine whether we are inside a method or not.
2172 ObjCMethodDecl *Method = tryCaptureObjCSelf(SuperLoc);
2173 if (!Method) {
1
Taking false branch
2174 Diag(SuperLoc, diag::err_invalid_receiver_to_message_super);
2175 return ExprError();
2176 }
2177
2178 ObjCInterfaceDecl *Class = Method->getClassInterface();
2179 if (!Class) {
2
Assuming 'Class' is non-null
3
Taking false branch
2180 Diag(SuperLoc, diag::err_no_super_class_message)
2181 << Method->getDeclName();
2182 return ExprError();
2183 }
2184
2185 QualType SuperTy(Class->getSuperClassType(), 0);
2186 if (SuperTy.isNull()) {
4
Taking false branch
2187 // The current class does not have a superclass.
2188 Diag(SuperLoc, diag::err_root_class_cannot_use_super)
2189 << Class->getIdentifier();
2190 return ExprError();
2191 }
2192
2193 // We are in a method whose class has a superclass, so 'super'
2194 // is acting as a keyword.
2195 if (Method->getSelector() == Sel)
5
Taking false branch
2196 getCurFunction()->ObjCShouldCallSuper = false;
2197
2198 if (Method->isInstanceMethod()) {
6
Assuming the condition is false
7
Taking false branch
2199 // Since we are in an instance method, this is an instance
2200 // message to the superclass instance.
2201 SuperTy = Context.getObjCObjectPointerType(SuperTy);
2202 return BuildInstanceMessage(nullptr, SuperTy, SuperLoc,
2203 Sel, /*Method=*/nullptr,
2204 LBracLoc, SelectorLocs, RBracLoc, Args);
2205 }
2206
2207 // Since we are in a class method, this is a class message to
2208 // the superclass.
2209 return BuildClassMessage(/*ReceiverTypeInfo=*/nullptr,
8
Passing null pointer value via 1st parameter 'ReceiverTypeInfo'
9
Calling 'Sema::BuildClassMessage'
2210 SuperTy,
2211 SuperLoc, Sel, /*Method=*/nullptr,
2212 LBracLoc, SelectorLocs, RBracLoc, Args);
2213}
2214
2215ExprResult Sema::BuildClassMessageImplicit(QualType ReceiverType,
2216 bool isSuperReceiver,
2217 SourceLocation Loc,
2218 Selector Sel,
2219 ObjCMethodDecl *Method,
2220 MultiExprArg Args) {
2221 TypeSourceInfo *receiverTypeInfo = nullptr;
2222 if (!ReceiverType.isNull())
2223 receiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType);
2224
2225 return BuildClassMessage(receiverTypeInfo, ReceiverType,
2226 /*SuperLoc=*/isSuperReceiver ? Loc : SourceLocation(),
2227 Sel, Method, Loc, Loc, Loc, Args,
2228 /*isImplicit=*/true);
2229}
2230
2231static void applyCocoaAPICheck(Sema &S, const ObjCMessageExpr *Msg,
2232 unsigned DiagID,
2233 bool (*refactor)(const ObjCMessageExpr *,
2234 const NSAPI &, edit::Commit &)) {
2235 SourceLocation MsgLoc = Msg->getExprLoc();
2236 if (S.Diags.isIgnored(DiagID, MsgLoc))
2237 return;
2238
2239 SourceManager &SM = S.SourceMgr;
2240 edit::Commit ECommit(SM, S.LangOpts);
2241 if (refactor(Msg,*S.NSAPIObj, ECommit)) {
2242 DiagnosticBuilder Builder = S.Diag(MsgLoc, DiagID)
2243 << Msg->getSelector() << Msg->getSourceRange();
2244 // FIXME: Don't emit diagnostic at all if fixits are non-commitable.
2245 if (!ECommit.isCommitable())
2246 return;
2247 for (edit::Commit::edit_iterator
2248 I = ECommit.edit_begin(), E = ECommit.edit_end(); I != E; ++I) {
2249 const edit::Commit::Edit &Edit = *I;
2250 switch (Edit.Kind) {
2251 case edit::Commit::Act_Insert:
2252 Builder.AddFixItHint(FixItHint::CreateInsertion(Edit.OrigLoc,
2253 Edit.Text,
2254 Edit.BeforePrev));
2255 break;
2256 case edit::Commit::Act_InsertFromRange:
2257 Builder.AddFixItHint(
2258 FixItHint::CreateInsertionFromRange(Edit.OrigLoc,
2259 Edit.getInsertFromRange(SM),
2260 Edit.BeforePrev));
2261 break;
2262 case edit::Commit::Act_Remove:
2263 Builder.AddFixItHint(FixItHint::CreateRemoval(Edit.getFileRange(SM)));
2264 break;
2265 }
2266 }
2267 }
2268}
2269
2270static void checkCocoaAPI(Sema &S, const ObjCMessageExpr *Msg) {
2271 applyCocoaAPICheck(S, Msg, diag::warn_objc_redundant_literal_use,
2272 edit::rewriteObjCRedundantCallWithLiteral);
2273}
2274
2275static void checkFoundationAPI(Sema &S, SourceLocation Loc,
2276 const ObjCMethodDecl *Method,
2277 ArrayRef<Expr *> Args, QualType ReceiverType,
2278 bool IsClassObjectCall) {
2279 // Check if this is a performSelector method that uses a selector that returns
2280 // a record or a vector type.
2281 if (Method->getSelector().getMethodFamily() != OMF_performSelector ||
2282 Args.empty())
2283 return;
2284 const auto *SE = dyn_cast<ObjCSelectorExpr>(Args[0]->IgnoreParens());
2285 if (!SE)
2286 return;
2287 ObjCMethodDecl *ImpliedMethod;
2288 if (!IsClassObjectCall) {
2289 const auto *OPT = ReceiverType->getAs<ObjCObjectPointerType>();
2290 if (!OPT || !OPT->getInterfaceDecl())
2291 return;
2292 ImpliedMethod =
2293 OPT->getInterfaceDecl()->lookupInstanceMethod(SE->getSelector());
2294 if (!ImpliedMethod)
2295 ImpliedMethod =
2296 OPT->getInterfaceDecl()->lookupPrivateMethod(SE->getSelector());
2297 } else {
2298 const auto *IT = ReceiverType->getAs<ObjCInterfaceType>();
2299 if (!IT)
2300 return;
2301 ImpliedMethod = IT->getDecl()->lookupClassMethod(SE->getSelector());
2302 if (!ImpliedMethod)
2303 ImpliedMethod =
2304 IT->getDecl()->lookupPrivateClassMethod(SE->getSelector());
2305 }
2306 if (!ImpliedMethod)
2307 return;
2308 QualType Ret = ImpliedMethod->getReturnType();
2309 if (Ret->isRecordType() || Ret->isVectorType() || Ret->isExtVectorType()) {
2310 QualType Ret = ImpliedMethod->getReturnType();
2311 S.Diag(Loc, diag::warn_objc_unsafe_perform_selector)
2312 << Method->getSelector()
2313 << (!Ret->isRecordType()
2314 ? /*Vector*/ 2
2315 : Ret->isUnionType() ? /*Union*/ 1 : /*Struct*/ 0);
2316 S.Diag(ImpliedMethod->getLocStart(),
2317 diag::note_objc_unsafe_perform_selector_method_declared_here)
2318 << ImpliedMethod->getSelector() << Ret;
2319 }
2320}
2321
2322/// \brief Diagnose use of %s directive in an NSString which is being passed
2323/// as formatting string to formatting method.
2324static void
2325DiagnoseCStringFormatDirectiveInObjCAPI(Sema &S,
2326 ObjCMethodDecl *Method,
2327 Selector Sel,
2328 Expr **Args, unsigned NumArgs) {
2329 unsigned Idx = 0;
2330 bool Format = false;
2331 ObjCStringFormatFamily SFFamily = Sel.getStringFormatFamily();
2332 if (SFFamily == ObjCStringFormatFamily::SFF_NSString) {
2333 Idx = 0;
2334 Format = true;
2335 }
2336 else if (Method) {
2337 for (const auto *I : Method->specific_attrs<FormatAttr>()) {
2338 if (S.GetFormatNSStringIdx(I, Idx)) {
2339 Format = true;
2340 break;
2341 }
2342 }
2343 }
2344 if (!Format || NumArgs <= Idx)
2345 return;
2346
2347 Expr *FormatExpr = Args[Idx];
2348 if (ObjCStringLiteral *OSL =
2349 dyn_cast<ObjCStringLiteral>(FormatExpr->IgnoreParenImpCasts())) {
2350 StringLiteral *FormatString = OSL->getString();
2351 if (S.FormatStringHasSArg(FormatString)) {
2352 S.Diag(FormatExpr->getExprLoc(), diag::warn_objc_cdirective_format_string)
2353 << "%s" << 0 << 0;
2354 if (Method)
2355 S.Diag(Method->getLocation(), diag::note_method_declared_at)
2356 << Method->getDeclName();
2357 }
2358 }
2359}
2360
2361/// \brief Build an Objective-C class message expression.
2362///
2363/// This routine takes care of both normal class messages and
2364/// class messages to the superclass.
2365///
2366/// \param ReceiverTypeInfo Type source information that describes the
2367/// receiver of this message. This may be NULL, in which case we are
2368/// sending to the superclass and \p SuperLoc must be a valid source
2369/// location.
2370
2371/// \param ReceiverType The type of the object receiving the
2372/// message. When \p ReceiverTypeInfo is non-NULL, this is the same
2373/// type as that refers to. For a superclass send, this is the type of
2374/// the superclass.
2375///
2376/// \param SuperLoc The location of the "super" keyword in a
2377/// superclass message.
2378///
2379/// \param Sel The selector to which the message is being sent.
2380///
2381/// \param Method The method that this class message is invoking, if
2382/// already known.
2383///
2384/// \param LBracLoc The location of the opening square bracket ']'.
2385///
2386/// \param RBracLoc The location of the closing square bracket ']'.
2387///
2388/// \param ArgsIn The message arguments.
2389ExprResult Sema::BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo,
2390 QualType ReceiverType,
2391 SourceLocation SuperLoc,
2392 Selector Sel,
2393 ObjCMethodDecl *Method,
2394 SourceLocation LBracLoc,
2395 ArrayRef<SourceLocation> SelectorLocs,
2396 SourceLocation RBracLoc,
2397 MultiExprArg ArgsIn,
2398 bool isImplicit) {
2399 SourceLocation Loc = SuperLoc.isValid()? SuperLoc
10
'?' condition is false
2400 : ReceiverTypeInfo->getTypeLoc().getSourceRange().getBegin();
11
Called C++ object pointer is null
2401 if (LBracLoc.isInvalid()) {
2402 Diag(Loc, diag::err_missing_open_square_message_send)
2403 << FixItHint::CreateInsertion(Loc, "[");
2404 LBracLoc = Loc;
2405 }
2406 SourceLocation SelLoc;
2407 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2408 SelLoc = SelectorLocs.front();
2409 else
2410 SelLoc = Loc;
2411
2412 if (ReceiverType->isDependentType()) {
2413 // If the receiver type is dependent, we can't type-check anything
2414 // at this point. Build a dependent expression.
2415 unsigned NumArgs = ArgsIn.size();
2416 Expr **Args = ArgsIn.data();
2417 assert(SuperLoc.isInvalid() && "Message to super with dependent type")(static_cast <bool> (SuperLoc.isInvalid() && "Message to super with dependent type"
) ? void (0) : __assert_fail ("SuperLoc.isInvalid() && \"Message to super with dependent type\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2417, __extension__ __PRETTY_FUNCTION__))
;
2418 return ObjCMessageExpr::Create(
2419 Context, ReceiverType, VK_RValue, LBracLoc, ReceiverTypeInfo, Sel,
2420 SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs), RBracLoc,
2421 isImplicit);
2422 }
2423
2424 // Find the class to which we are sending this message.
2425 ObjCInterfaceDecl *Class = nullptr;
2426 const ObjCObjectType *ClassType = ReceiverType->getAs<ObjCObjectType>();
2427 if (!ClassType || !(Class = ClassType->getInterface())) {
2428 Diag(Loc, diag::err_invalid_receiver_class_message)
2429 << ReceiverType;
2430 return ExprError();
2431 }
2432 assert(Class && "We don't know which class we're messaging?")(static_cast <bool> (Class && "We don't know which class we're messaging?"
) ? void (0) : __assert_fail ("Class && \"We don't know which class we're messaging?\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2432, __extension__ __PRETTY_FUNCTION__))
;
2433 // objc++ diagnoses during typename annotation.
2434 if (!getLangOpts().CPlusPlus)
2435 (void)DiagnoseUseOfDecl(Class, SelLoc);
2436 // Find the method we are messaging.
2437 if (!Method) {
2438 SourceRange TypeRange
2439 = SuperLoc.isValid()? SourceRange(SuperLoc)
2440 : ReceiverTypeInfo->getTypeLoc().getSourceRange();
2441 if (RequireCompleteType(Loc, Context.getObjCInterfaceType(Class),
2442 (getLangOpts().ObjCAutoRefCount
2443 ? diag::err_arc_receiver_forward_class
2444 : diag::warn_receiver_forward_class),
2445 TypeRange)) {
2446 // A forward class used in messaging is treated as a 'Class'
2447 Method = LookupFactoryMethodInGlobalPool(Sel,
2448 SourceRange(LBracLoc, RBracLoc));
2449 if (Method && !getLangOpts().ObjCAutoRefCount)
2450 Diag(Method->getLocation(), diag::note_method_sent_forward_class)
2451 << Method->getDeclName();
2452 }
2453 if (!Method)
2454 Method = Class->lookupClassMethod(Sel);
2455
2456 // If we have an implementation in scope, check "private" methods.
2457 if (!Method)
2458 Method = Class->lookupPrivateClassMethod(Sel);
2459
2460 if (Method && DiagnoseUseOfDecl(Method, SelLoc))
2461 return ExprError();
2462 }
2463
2464 // Check the argument types and determine the result type.
2465 QualType ReturnType;
2466 ExprValueKind VK = VK_RValue;
2467
2468 unsigned NumArgs = ArgsIn.size();
2469 Expr **Args = ArgsIn.data();
2470 if (CheckMessageArgumentTypes(ReceiverType, MultiExprArg(Args, NumArgs),
2471 Sel, SelectorLocs,
2472 Method, true,
2473 SuperLoc.isValid(), LBracLoc, RBracLoc,
2474 SourceRange(),
2475 ReturnType, VK))
2476 return ExprError();
2477
2478 if (Method && !Method->getReturnType()->isVoidType() &&
2479 RequireCompleteType(LBracLoc, Method->getReturnType(),
2480 diag::err_illegal_message_expr_incomplete_type))
2481 return ExprError();
2482
2483 // Warn about explicit call of +initialize on its own class. But not on 'super'.
2484 if (Method && Method->getMethodFamily() == OMF_initialize) {
2485 if (!SuperLoc.isValid()) {
2486 const ObjCInterfaceDecl *ID =
2487 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext());
2488 if (ID == Class) {
2489 Diag(Loc, diag::warn_direct_initialize_call);
2490 Diag(Method->getLocation(), diag::note_method_declared_at)
2491 << Method->getDeclName();
2492 }
2493 }
2494 else if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2495 // [super initialize] is allowed only within an +initialize implementation
2496 if (CurMeth->getMethodFamily() != OMF_initialize) {
2497 Diag(Loc, diag::warn_direct_super_initialize_call);
2498 Diag(Method->getLocation(), diag::note_method_declared_at)
2499 << Method->getDeclName();
2500 Diag(CurMeth->getLocation(), diag::note_method_declared_at)
2501 << CurMeth->getDeclName();
2502 }
2503 }
2504 }
2505
2506 DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
2507
2508 // Construct the appropriate ObjCMessageExpr.
2509 ObjCMessageExpr *Result;
2510 if (SuperLoc.isValid())
2511 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2512 SuperLoc, /*IsInstanceSuper=*/false,
2513 ReceiverType, Sel, SelectorLocs,
2514 Method, makeArrayRef(Args, NumArgs),
2515 RBracLoc, isImplicit);
2516 else {
2517 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2518 ReceiverTypeInfo, Sel, SelectorLocs,
2519 Method, makeArrayRef(Args, NumArgs),
2520 RBracLoc, isImplicit);
2521 if (!isImplicit)
2522 checkCocoaAPI(*this, Result);
2523 }
2524 if (Method)
2525 checkFoundationAPI(*this, SelLoc, Method, makeArrayRef(Args, NumArgs),
2526 ReceiverType, /*IsClassObjectCall=*/true);
2527 return MaybeBindToTemporary(Result);
2528}
2529
2530// ActOnClassMessage - used for both unary and keyword messages.
2531// ArgExprs is optional - if it is present, the number of expressions
2532// is obtained from Sel.getNumArgs().
2533ExprResult Sema::ActOnClassMessage(Scope *S,
2534 ParsedType Receiver,
2535 Selector Sel,
2536 SourceLocation LBracLoc,
2537 ArrayRef<SourceLocation> SelectorLocs,
2538 SourceLocation RBracLoc,
2539 MultiExprArg Args) {
2540 TypeSourceInfo *ReceiverTypeInfo;
2541 QualType ReceiverType = GetTypeFromParser(Receiver, &ReceiverTypeInfo);
2542 if (ReceiverType.isNull())
2543 return ExprError();
2544
2545 if (!ReceiverTypeInfo)
2546 ReceiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType, LBracLoc);
2547
2548 return BuildClassMessage(ReceiverTypeInfo, ReceiverType,
2549 /*SuperLoc=*/SourceLocation(), Sel,
2550 /*Method=*/nullptr, LBracLoc, SelectorLocs, RBracLoc,
2551 Args);
2552}
2553
2554ExprResult Sema::BuildInstanceMessageImplicit(Expr *Receiver,
2555 QualType ReceiverType,
2556 SourceLocation Loc,
2557 Selector Sel,
2558 ObjCMethodDecl *Method,
2559 MultiExprArg Args) {
2560 return BuildInstanceMessage(Receiver, ReceiverType,
2561 /*SuperLoc=*/!Receiver ? Loc : SourceLocation(),
2562 Sel, Method, Loc, Loc, Loc, Args,
2563 /*isImplicit=*/true);
2564}
2565
2566static bool isMethodDeclaredInRootProtocol(Sema &S, const ObjCMethodDecl *M) {
2567 if (!S.NSAPIObj)
2568 return false;
2569 const auto *Protocol = dyn_cast<ObjCProtocolDecl>(M->getDeclContext());
2570 if (!Protocol)
2571 return false;
2572 const IdentifierInfo *II = S.NSAPIObj->getNSClassId(NSAPI::ClassId_NSObject);
2573 if (const auto *RootClass = dyn_cast_or_null<ObjCInterfaceDecl>(
2574 S.LookupSingleName(S.TUScope, II, Protocol->getLocStart(),
2575 Sema::LookupOrdinaryName))) {
2576 for (const ObjCProtocolDecl *P : RootClass->all_referenced_protocols()) {
2577 if (P->getCanonicalDecl() == Protocol->getCanonicalDecl())
2578 return true;
2579 }
2580 }
2581 return false;
2582}
2583
2584/// \brief Build an Objective-C instance message expression.
2585///
2586/// This routine takes care of both normal instance messages and
2587/// instance messages to the superclass instance.
2588///
2589/// \param Receiver The expression that computes the object that will
2590/// receive this message. This may be empty, in which case we are
2591/// sending to the superclass instance and \p SuperLoc must be a valid
2592/// source location.
2593///
2594/// \param ReceiverType The (static) type of the object receiving the
2595/// message. When a \p Receiver expression is provided, this is the
2596/// same type as that expression. For a superclass instance send, this
2597/// is a pointer to the type of the superclass.
2598///
2599/// \param SuperLoc The location of the "super" keyword in a
2600/// superclass instance message.
2601///
2602/// \param Sel The selector to which the message is being sent.
2603///
2604/// \param Method The method that this instance message is invoking, if
2605/// already known.
2606///
2607/// \param LBracLoc The location of the opening square bracket ']'.
2608///
2609/// \param RBracLoc The location of the closing square bracket ']'.
2610///
2611/// \param ArgsIn The message arguments.
2612ExprResult Sema::BuildInstanceMessage(Expr *Receiver,
2613 QualType ReceiverType,
2614 SourceLocation SuperLoc,
2615 Selector Sel,
2616 ObjCMethodDecl *Method,
2617 SourceLocation LBracLoc,
2618 ArrayRef<SourceLocation> SelectorLocs,
2619 SourceLocation RBracLoc,
2620 MultiExprArg ArgsIn,
2621 bool isImplicit) {
2622 assert((Receiver || SuperLoc.isValid()) && "If the Receiver is null, the "(static_cast <bool> ((Receiver || SuperLoc.isValid()) &&
"If the Receiver is null, the " "SuperLoc must be valid so we can "
"use it instead.") ? void (0) : __assert_fail ("(Receiver || SuperLoc.isValid()) && \"If the Receiver is null, the \" \"SuperLoc must be valid so we can \" \"use it instead.\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2624, __extension__ __PRETTY_FUNCTION__))
2623 "SuperLoc must be valid so we can "(static_cast <bool> ((Receiver || SuperLoc.isValid()) &&
"If the Receiver is null, the " "SuperLoc must be valid so we can "
"use it instead.") ? void (0) : __assert_fail ("(Receiver || SuperLoc.isValid()) && \"If the Receiver is null, the \" \"SuperLoc must be valid so we can \" \"use it instead.\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2624, __extension__ __PRETTY_FUNCTION__))
2624 "use it instead.")(static_cast <bool> ((Receiver || SuperLoc.isValid()) &&
"If the Receiver is null, the " "SuperLoc must be valid so we can "
"use it instead.") ? void (0) : __assert_fail ("(Receiver || SuperLoc.isValid()) && \"If the Receiver is null, the \" \"SuperLoc must be valid so we can \" \"use it instead.\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2624, __extension__ __PRETTY_FUNCTION__))
;
2625
2626 // The location of the receiver.
2627 SourceLocation Loc = SuperLoc.isValid()? SuperLoc : Receiver->getLocStart();
2628 SourceRange RecRange =
2629 SuperLoc.isValid()? SuperLoc : Receiver->getSourceRange();
2630 SourceLocation SelLoc;
2631 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2632 SelLoc = SelectorLocs.front();
2633 else
2634 SelLoc = Loc;
2635
2636 if (LBracLoc.isInvalid()) {
2637 Diag(Loc, diag::err_missing_open_square_message_send)
2638 << FixItHint::CreateInsertion(Loc, "[");
2639 LBracLoc = Loc;
2640 }
2641
2642 // If we have a receiver expression, perform appropriate promotions
2643 // and determine receiver type.
2644 if (Receiver) {
2645 if (Receiver->hasPlaceholderType()) {
2646 ExprResult Result;
2647 if (Receiver->getType() == Context.UnknownAnyTy)
2648 Result = forceUnknownAnyToType(Receiver, Context.getObjCIdType());
2649 else
2650 Result = CheckPlaceholderExpr(Receiver);
2651 if (Result.isInvalid()) return ExprError();
2652 Receiver = Result.get();
2653 }
2654
2655 if (Receiver->isTypeDependent()) {
2656 // If the receiver is type-dependent, we can't type-check anything
2657 // at this point. Build a dependent expression.
2658 unsigned NumArgs = ArgsIn.size();
2659 Expr **Args = ArgsIn.data();
2660 assert(SuperLoc.isInvalid() && "Message to super with dependent type")(static_cast <bool> (SuperLoc.isInvalid() && "Message to super with dependent type"
) ? void (0) : __assert_fail ("SuperLoc.isInvalid() && \"Message to super with dependent type\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2660, __extension__ __PRETTY_FUNCTION__))
;
2661 return ObjCMessageExpr::Create(
2662 Context, Context.DependentTy, VK_RValue, LBracLoc, Receiver, Sel,
2663 SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs),
2664 RBracLoc, isImplicit);
2665 }
2666
2667 // If necessary, apply function/array conversion to the receiver.
2668 // C99 6.7.5.3p[7,8].
2669 ExprResult Result = DefaultFunctionArrayLvalueConversion(Receiver);
2670 if (Result.isInvalid())
2671 return ExprError();
2672 Receiver = Result.get();
2673 ReceiverType = Receiver->getType();
2674
2675 // If the receiver is an ObjC pointer, a block pointer, or an
2676 // __attribute__((NSObject)) pointer, we don't need to do any
2677 // special conversion in order to look up a receiver.
2678 if (ReceiverType->isObjCRetainableType()) {
2679 // do nothing
2680 } else if (!getLangOpts().ObjCAutoRefCount &&
2681 !Context.getObjCIdType().isNull() &&
2682 (ReceiverType->isPointerType() ||
2683 ReceiverType->isIntegerType())) {
2684 // Implicitly convert integers and pointers to 'id' but emit a warning.
2685 // But not in ARC.
2686 Diag(Loc, diag::warn_bad_receiver_type)
2687 << ReceiverType
2688 << Receiver->getSourceRange();
2689 if (ReceiverType->isPointerType()) {
2690 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2691 CK_CPointerToObjCPointerCast).get();
2692 } else {
2693 // TODO: specialized warning on null receivers?
2694 bool IsNull = Receiver->isNullPointerConstant(Context,
2695 Expr::NPC_ValueDependentIsNull);
2696 CastKind Kind = IsNull ? CK_NullToPointer : CK_IntegralToPointer;
2697 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2698 Kind).get();
2699 }
2700 ReceiverType = Receiver->getType();
2701 } else if (getLangOpts().CPlusPlus) {
2702 // The receiver must be a complete type.
2703 if (RequireCompleteType(Loc, Receiver->getType(),
2704 diag::err_incomplete_receiver_type))
2705 return ExprError();
2706
2707 ExprResult result = PerformContextuallyConvertToObjCPointer(Receiver);
2708 if (result.isUsable()) {
2709 Receiver = result.get();
2710 ReceiverType = Receiver->getType();
2711 }
2712 }
2713 }
2714
2715 if (ReceiverType->isObjCIdType() && !isImplicit)
2716 Diag(Receiver->getExprLoc(), diag::warn_messaging_unqualified_id);
2717
2718 // There's a somewhat weird interaction here where we assume that we
2719 // won't actually have a method unless we also don't need to do some
2720 // of the more detailed type-checking on the receiver.
2721
2722 if (!Method) {
2723 // Handle messages to id and __kindof types (where we use the
2724 // global method pool).
2725 const ObjCObjectType *typeBound = nullptr;
2726 bool receiverIsIdLike = ReceiverType->isObjCIdOrObjectKindOfType(Context,
2727 typeBound);
2728 if (receiverIsIdLike || ReceiverType->isBlockPointerType() ||
2729 (Receiver && Context.isObjCNSObjectType(Receiver->getType()))) {
2730 SmallVector<ObjCMethodDecl*, 4> Methods;
2731 // If we have a type bound, further filter the methods.
2732 CollectMultipleMethodsInGlobalPool(Sel, Methods, true/*InstanceFirst*/,
2733 true/*CheckTheOther*/, typeBound);
2734 if (!Methods.empty()) {
2735 // We choose the first method as the initial candidate, then try to
2736 // select a better one.
2737 Method = Methods[0];
2738
2739 if (ObjCMethodDecl *BestMethod =
2740 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(), Methods))
2741 Method = BestMethod;
2742
2743 if (!AreMultipleMethodsInGlobalPool(Sel, Method,
2744 SourceRange(LBracLoc, RBracLoc),
2745 receiverIsIdLike, Methods))
2746 DiagnoseUseOfDecl(Method, SelLoc);
2747 }
2748 } else if (ReceiverType->isObjCClassOrClassKindOfType() ||
2749 ReceiverType->isObjCQualifiedClassType()) {
2750 // Handle messages to Class.
2751 // We allow sending a message to a qualified Class ("Class<foo>"), which
2752 // is ok as long as one of the protocols implements the selector (if not,
2753 // warn).
2754 if (!ReceiverType->isObjCClassOrClassKindOfType()) {
2755 const ObjCObjectPointerType *QClassTy
2756 = ReceiverType->getAsObjCQualifiedClassType();
2757 // Search protocols for class methods.
2758 Method = LookupMethodInQualifiedType(Sel, QClassTy, false);
2759 if (!Method) {
2760 Method = LookupMethodInQualifiedType(Sel, QClassTy, true);
2761 // warn if instance method found for a Class message.
2762 if (Method && !isMethodDeclaredInRootProtocol(*this, Method)) {
2763 Diag(SelLoc, diag::warn_instance_method_on_class_found)
2764 << Method->getSelector() << Sel;
2765 Diag(Method->getLocation(), diag::note_method_declared_at)
2766 << Method->getDeclName();
2767 }
2768 }
2769 } else {
2770 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2771 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) {
2772 // First check the public methods in the class interface.
2773 Method = ClassDecl->lookupClassMethod(Sel);
2774
2775 if (!Method)
2776 Method = ClassDecl->lookupPrivateClassMethod(Sel);
2777 }
2778 if (Method && DiagnoseUseOfDecl(Method, SelLoc))
2779 return ExprError();
2780 }
2781 if (!Method) {
2782 // If not messaging 'self', look for any factory method named 'Sel'.
2783 if (!Receiver || !isSelfExpr(Receiver)) {
2784 // If no class (factory) method was found, check if an _instance_
2785 // method of the same name exists in the root class only.
2786 SmallVector<ObjCMethodDecl*, 4> Methods;
2787 CollectMultipleMethodsInGlobalPool(Sel, Methods,
2788 false/*InstanceFirst*/,
2789 true/*CheckTheOther*/);
2790 if (!Methods.empty()) {
2791 // We choose the first method as the initial candidate, then try
2792 // to select a better one.
2793 Method = Methods[0];
2794
2795 // If we find an instance method, emit waring.
2796 if (Method->isInstanceMethod()) {
2797 if (const ObjCInterfaceDecl *ID =
2798 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext())) {
2799 if (ID->getSuperClass())
2800 Diag(SelLoc, diag::warn_root_inst_method_not_found)
2801 << Sel << SourceRange(LBracLoc, RBracLoc);
2802 }
2803 }
2804
2805 if (ObjCMethodDecl *BestMethod =
2806 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(),
2807 Methods))
2808 Method = BestMethod;
2809 }
2810 }
2811 }
2812 }
2813 } else {
2814 ObjCInterfaceDecl *ClassDecl = nullptr;
2815
2816 // We allow sending a message to a qualified ID ("id<foo>"), which is ok as
2817 // long as one of the protocols implements the selector (if not, warn).
2818 // And as long as message is not deprecated/unavailable (warn if it is).
2819 if (const ObjCObjectPointerType *QIdTy
2820 = ReceiverType->getAsObjCQualifiedIdType()) {
2821 // Search protocols for instance methods.
2822 Method = LookupMethodInQualifiedType(Sel, QIdTy, true);
2823 if (!Method)
2824 Method = LookupMethodInQualifiedType(Sel, QIdTy, false);
2825 if (Method && DiagnoseUseOfDecl(Method, SelLoc))
2826 return ExprError();
2827 } else if (const ObjCObjectPointerType *OCIType
2828 = ReceiverType->getAsObjCInterfacePointerType()) {
2829 // We allow sending a message to a pointer to an interface (an object).
2830 ClassDecl = OCIType->getInterfaceDecl();
2831
2832 // Try to complete the type. Under ARC, this is a hard error from which
2833 // we don't try to recover.
2834 // FIXME: In the non-ARC case, this will still be a hard error if the
2835 // definition is found in a module that's not visible.
2836 const ObjCInterfaceDecl *forwardClass = nullptr;
2837 if (RequireCompleteType(Loc, OCIType->getPointeeType(),
2838 getLangOpts().ObjCAutoRefCount
2839 ? diag::err_arc_receiver_forward_instance
2840 : diag::warn_receiver_forward_instance,
2841 Receiver? Receiver->getSourceRange()
2842 : SourceRange(SuperLoc))) {
2843 if (getLangOpts().ObjCAutoRefCount)
2844 return ExprError();
2845
2846 forwardClass = OCIType->getInterfaceDecl();
2847 Diag(Receiver ? Receiver->getLocStart()
2848 : SuperLoc, diag::note_receiver_is_id);
2849 Method = nullptr;
2850 } else {
2851 Method = ClassDecl->lookupInstanceMethod(Sel);
2852 }
2853
2854 if (!Method)
2855 // Search protocol qualifiers.
2856 Method = LookupMethodInQualifiedType(Sel, OCIType, true);
2857
2858 if (!Method) {
2859 // If we have implementations in scope, check "private" methods.
2860 Method = ClassDecl->lookupPrivateMethod(Sel);
2861
2862 if (!Method && getLangOpts().ObjCAutoRefCount) {
2863 Diag(SelLoc, diag::err_arc_may_not_respond)
2864 << OCIType->getPointeeType() << Sel << RecRange
2865 << SourceRange(SelectorLocs.front(), SelectorLocs.back());
2866 return ExprError();
2867 }
2868
2869 if (!Method && (!Receiver || !isSelfExpr(Receiver))) {
2870 // If we still haven't found a method, look in the global pool. This
2871 // behavior isn't very desirable, however we need it for GCC
2872 // compatibility. FIXME: should we deviate??
2873 if (OCIType->qual_empty()) {
2874 SmallVector<ObjCMethodDecl*, 4> Methods;
2875 CollectMultipleMethodsInGlobalPool(Sel, Methods,
2876 true/*InstanceFirst*/,
2877 false/*CheckTheOther*/);
2878 if (!Methods.empty()) {
2879 // We choose the first method as the initial candidate, then try
2880 // to select a better one.
2881 Method = Methods[0];
2882
2883 if (ObjCMethodDecl *BestMethod =
2884 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(),
2885 Methods))
2886 Method = BestMethod;
2887
2888 AreMultipleMethodsInGlobalPool(Sel, Method,
2889 SourceRange(LBracLoc, RBracLoc),
2890 true/*receiverIdOrClass*/,
2891 Methods);
2892 }
2893 if (Method && !forwardClass)
2894 Diag(SelLoc, diag::warn_maynot_respond)
2895 << OCIType->getInterfaceDecl()->getIdentifier()
2896 << Sel << RecRange;
2897 }
2898 }
2899 }
2900 if (Method && DiagnoseUseOfDecl(Method, SelLoc, forwardClass))
2901 return ExprError();
2902 } else {
2903 // Reject other random receiver types (e.g. structs).
2904 Diag(Loc, diag::err_bad_receiver_type)
2905 << ReceiverType << Receiver->getSourceRange();
2906 return ExprError();
2907 }
2908 }
2909 }
2910
2911 FunctionScopeInfo *DIFunctionScopeInfo =
2912 (Method && Method->getMethodFamily() == OMF_init)
2913 ? getEnclosingFunction() : nullptr;
2914
2915 if (DIFunctionScopeInfo &&
2916 DIFunctionScopeInfo->ObjCIsDesignatedInit &&
2917 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2918 bool isDesignatedInitChain = false;
2919 if (SuperLoc.isValid()) {
2920 if (const ObjCObjectPointerType *
2921 OCIType = ReceiverType->getAsObjCInterfacePointerType()) {
2922 if (const ObjCInterfaceDecl *ID = OCIType->getInterfaceDecl()) {
2923 // Either we know this is a designated initializer or we
2924 // conservatively assume it because we don't know for sure.
2925 if (!ID->declaresOrInheritsDesignatedInitializers() ||
2926 ID->isDesignatedInitializer(Sel)) {
2927 isDesignatedInitChain = true;
2928 DIFunctionScopeInfo->ObjCWarnForNoDesignatedInitChain = false;
2929 }
2930 }
2931 }
2932 }
2933 if (!isDesignatedInitChain) {
2934 const ObjCMethodDecl *InitMethod = nullptr;
2935 bool isDesignated =
2936 getCurMethodDecl()->isDesignatedInitializerForTheInterface(&InitMethod);
2937 assert(isDesignated && InitMethod)(static_cast <bool> (isDesignated && InitMethod
) ? void (0) : __assert_fail ("isDesignated && InitMethod"
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2937, __extension__ __PRETTY_FUNCTION__))
;
2938 (void)isDesignated;
2939 Diag(SelLoc, SuperLoc.isValid() ?
2940 diag::warn_objc_designated_init_non_designated_init_call :
2941 diag::warn_objc_designated_init_non_super_designated_init_call);
2942 Diag(InitMethod->getLocation(),
2943 diag::note_objc_designated_init_marked_here);
2944 }
2945 }
2946
2947 if (DIFunctionScopeInfo &&
2948 DIFunctionScopeInfo->ObjCIsSecondaryInit &&
2949 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2950 if (SuperLoc.isValid()) {
2951 Diag(SelLoc, diag::warn_objc_secondary_init_super_init_call);
2952 } else {
2953 DIFunctionScopeInfo->ObjCWarnForNoInitDelegation = false;
2954 }
2955 }
2956
2957 // Check the message arguments.
2958 unsigned NumArgs = ArgsIn.size();
2959 Expr **Args = ArgsIn.data();
2960 QualType ReturnType;
2961 ExprValueKind VK = VK_RValue;
2962 bool ClassMessage = (ReceiverType->isObjCClassType() ||
2963 ReceiverType->isObjCQualifiedClassType());
2964 if (CheckMessageArgumentTypes(ReceiverType, MultiExprArg(Args, NumArgs),
2965 Sel, SelectorLocs, Method,
2966 ClassMessage, SuperLoc.isValid(),
2967 LBracLoc, RBracLoc, RecRange, ReturnType, VK))
2968 return ExprError();
2969
2970 if (Method && !Method->getReturnType()->isVoidType() &&
2971 RequireCompleteType(LBracLoc, Method->getReturnType(),
2972 diag::err_illegal_message_expr_incomplete_type))
2973 return ExprError();
2974
2975 // In ARC, forbid the user from sending messages to
2976 // retain/release/autorelease/dealloc/retainCount explicitly.
2977 if (getLangOpts().ObjCAutoRefCount) {
2978 ObjCMethodFamily family =
2979 (Method ? Method->getMethodFamily() : Sel.getMethodFamily());
2980 switch (family) {
2981 case OMF_init:
2982 if (Method)
2983 checkInitMethod(Method, ReceiverType);
2984
2985 case OMF_None:
2986 case OMF_alloc:
2987 case OMF_copy:
2988 case OMF_finalize:
2989 case OMF_mutableCopy:
2990 case OMF_new:
2991 case OMF_self:
2992 case OMF_initialize:
2993 break;
2994
2995 case OMF_dealloc:
2996 case OMF_retain:
2997 case OMF_release:
2998 case OMF_autorelease:
2999 case OMF_retainCount:
3000 Diag(SelLoc, diag::err_arc_illegal_explicit_message)
3001 << Sel << RecRange;
3002 break;
3003
3004 case OMF_performSelector:
3005 if (Method && NumArgs >= 1) {
3006 if (const auto *SelExp =
3007 dyn_cast<ObjCSelectorExpr>(Args[0]->IgnoreParens())) {
3008 Selector ArgSel = SelExp->getSelector();
3009 ObjCMethodDecl *SelMethod =
3010 LookupInstanceMethodInGlobalPool(ArgSel,
3011 SelExp->getSourceRange());
3012 if (!SelMethod)
3013 SelMethod =
3014 LookupFactoryMethodInGlobalPool(ArgSel,
3015 SelExp->getSourceRange());
3016 if (SelMethod) {
3017 ObjCMethodFamily SelFamily = SelMethod->getMethodFamily();
3018 switch (SelFamily) {
3019 case OMF_alloc:
3020 case OMF_copy:
3021 case OMF_mutableCopy:
3022 case OMF_new:
3023 case OMF_init:
3024 // Issue error, unless ns_returns_not_retained.
3025 if (!SelMethod->hasAttr<NSReturnsNotRetainedAttr>()) {
3026 // selector names a +1 method
3027 Diag(SelLoc,
3028 diag::err_arc_perform_selector_retains);
3029 Diag(SelMethod->getLocation(), diag::note_method_declared_at)
3030 << SelMethod->getDeclName();
3031 }
3032 break;
3033 default:
3034 // +0 call. OK. unless ns_returns_retained.
3035 if (SelMethod->hasAttr<NSReturnsRetainedAttr>()) {
3036 // selector names a +1 method
3037 Diag(SelLoc,
3038 diag::err_arc_perform_selector_retains);
3039 Diag(SelMethod->getLocation(), diag::note_method_declared_at)
3040 << SelMethod->getDeclName();
3041 }
3042 break;
3043 }
3044 }
3045 } else {
3046 // error (may leak).
3047 Diag(SelLoc, diag::warn_arc_perform_selector_leaks);
3048 Diag(Args[0]->getExprLoc(), diag::note_used_here);
3049 }
3050 }
3051 break;
3052 }
3053 }
3054
3055 DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
3056
3057 // Construct the appropriate ObjCMessageExpr instance.
3058 ObjCMessageExpr *Result;
3059 if (SuperLoc.isValid())
3060 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
3061 SuperLoc, /*IsInstanceSuper=*/true,
3062 ReceiverType, Sel, SelectorLocs, Method,
3063 makeArrayRef(Args, NumArgs), RBracLoc,
3064 isImplicit);
3065 else {
3066 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
3067 Receiver, Sel, SelectorLocs, Method,
3068 makeArrayRef(Args, NumArgs), RBracLoc,
3069 isImplicit);
3070 if (!isImplicit)
3071 checkCocoaAPI(*this, Result);
3072 }
3073 if (Method) {
3074 bool IsClassObjectCall = ClassMessage;
3075 // 'self' message receivers in class methods should be treated as message
3076 // sends to the class object in order for the semantic checks to be
3077 // performed correctly. Messages to 'super' already count as class messages,
3078 // so they don't need to be handled here.
3079 if (Receiver && isSelfExpr(Receiver)) {
3080 if (const auto *OPT = ReceiverType->getAs<ObjCObjectPointerType>()) {
3081 if (OPT->getObjectType()->isObjCClass()) {
3082 if (const auto *CurMeth = getCurMethodDecl()) {
3083 IsClassObjectCall = true;
3084 ReceiverType =
3085 Context.getObjCInterfaceType(CurMeth->getClassInterface());
3086 }
3087 }
3088 }
3089 }
3090 checkFoundationAPI(*this, SelLoc, Method, makeArrayRef(Args, NumArgs),
3091 ReceiverType, IsClassObjectCall);
3092 }
3093
3094 if (getLangOpts().ObjCAutoRefCount) {
3095 // In ARC, annotate delegate init calls.
3096 if (Result->getMethodFamily() == OMF_init &&
3097 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
3098 // Only consider init calls *directly* in init implementations,
3099 // not within blocks.
3100 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(CurContext);
3101 if (method && method->getMethodFamily() == OMF_init) {
3102 // The implicit assignment to self means we also don't want to
3103 // consume the result.
3104 Result->setDelegateInitCall(true);
3105 return Result;
3106 }
3107 }
3108
3109 // In ARC, check for message sends which are likely to introduce
3110 // retain cycles.
3111 checkRetainCycles(Result);
3112 }
3113
3114 if (getLangOpts().ObjCWeak) {
3115 if (!isImplicit && Method) {
3116 if (const ObjCPropertyDecl *Prop = Method->findPropertyDecl()) {
3117 bool IsWeak =
3118 Prop->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak;
3119 if (!IsWeak && Sel.isUnarySelector())
3120 IsWeak = ReturnType.getObjCLifetime() & Qualifiers::OCL_Weak;
3121 if (IsWeak &&
3122 !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, LBracLoc))
3123 getCurFunction()->recordUseOfWeak(Result, Prop);
3124 }
3125 }
3126 }
3127
3128 CheckObjCCircularContainer(Result);
3129
3130 return MaybeBindToTemporary(Result);
3131}
3132
3133static void RemoveSelectorFromWarningCache(Sema &S, Expr* Arg) {
3134 if (ObjCSelectorExpr *OSE =
3135 dyn_cast<ObjCSelectorExpr>(Arg->IgnoreParenCasts())) {
3136 Selector Sel = OSE->getSelector();
3137 SourceLocation Loc = OSE->getAtLoc();
3138 auto Pos = S.ReferencedSelectors.find(Sel);
3139 if (Pos != S.ReferencedSelectors.end() && Pos->second == Loc)
3140 S.ReferencedSelectors.erase(Pos);
3141 }
3142}
3143
3144// ActOnInstanceMessage - used for both unary and keyword messages.
3145// ArgExprs is optional - if it is present, the number of expressions
3146// is obtained from Sel.getNumArgs().
3147ExprResult Sema::ActOnInstanceMessage(Scope *S,
3148 Expr *Receiver,
3149 Selector Sel,
3150 SourceLocation LBracLoc,
3151 ArrayRef<SourceLocation> SelectorLocs,
3152 SourceLocation RBracLoc,
3153 MultiExprArg Args) {
3154 if (!Receiver)
3155 return ExprError();
3156
3157 // A ParenListExpr can show up while doing error recovery with invalid code.
3158 if (isa<ParenListExpr>(Receiver)) {
3159 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Receiver);
3160 if (Result.isInvalid()) return ExprError();
3161 Receiver = Result.get();
3162 }
3163
3164 if (RespondsToSelectorSel.isNull()) {
3165 IdentifierInfo *SelectorId = &Context.Idents.get("respondsToSelector");
3166 RespondsToSelectorSel = Context.Selectors.getUnarySelector(SelectorId);
3167 }
3168 if (Sel == RespondsToSelectorSel)
3169 RemoveSelectorFromWarningCache(*this, Args[0]);
3170
3171 return BuildInstanceMessage(Receiver, Receiver->getType(),
3172 /*SuperLoc=*/SourceLocation(), Sel,
3173 /*Method=*/nullptr, LBracLoc, SelectorLocs,
3174 RBracLoc, Args);
3175}
3176
3177enum ARCConversionTypeClass {
3178 /// int, void, struct A
3179 ACTC_none,
3180
3181 /// id, void (^)()
3182 ACTC_retainable,
3183
3184 /// id*, id***, void (^*)(),
3185 ACTC_indirectRetainable,
3186
3187 /// void* might be a normal C type, or it might a CF type.
3188 ACTC_voidPtr,
3189
3190 /// struct A*
3191 ACTC_coreFoundation
3192};
3193
3194static bool isAnyRetainable(ARCConversionTypeClass ACTC) {
3195 return (ACTC == ACTC_retainable ||
3196 ACTC == ACTC_coreFoundation ||
3197 ACTC == ACTC_voidPtr);
3198}
3199
3200static bool isAnyCLike(ARCConversionTypeClass ACTC) {
3201 return ACTC == ACTC_none ||
3202 ACTC == ACTC_voidPtr ||
3203 ACTC == ACTC_coreFoundation;
3204}
3205
3206static ARCConversionTypeClass classifyTypeForARCConversion(QualType type) {
3207 bool isIndirect = false;
3208
3209 // Ignore an outermost reference type.
3210 if (const ReferenceType *ref = type->getAs<ReferenceType>()) {
3211 type = ref->getPointeeType();
3212 isIndirect = true;
3213 }
3214
3215 // Drill through pointers and arrays recursively.
3216 while (true) {
3217 if (const PointerType *ptr = type->getAs<PointerType>()) {
3218 type = ptr->getPointeeType();
3219
3220 // The first level of pointer may be the innermost pointer on a CF type.
3221 if (!isIndirect) {
3222 if (type->isVoidType()) return ACTC_voidPtr;
3223 if (type->isRecordType()) return ACTC_coreFoundation;
3224 }
3225 } else if (const ArrayType *array = type->getAsArrayTypeUnsafe()) {
3226 type = QualType(array->getElementType()->getBaseElementTypeUnsafe(), 0);
3227 } else {
3228 break;
3229 }
3230 isIndirect = true;
3231 }
3232
3233 if (isIndirect) {
3234 if (type->isObjCARCBridgableType())
3235 return ACTC_indirectRetainable;
3236 return ACTC_none;
3237 }
3238
3239 if (type->isObjCARCBridgableType())
3240 return ACTC_retainable;
3241
3242 return ACTC_none;
3243}
3244
3245namespace {
3246 /// A result from the cast checker.
3247 enum ACCResult {
3248 /// Cannot be casted.
3249 ACC_invalid,
3250
3251 /// Can be safely retained or not retained.
3252 ACC_bottom,
3253
3254 /// Can be casted at +0.
3255 ACC_plusZero,
3256
3257 /// Can be casted at +1.
3258 ACC_plusOne
3259 };
3260 ACCResult merge(ACCResult left, ACCResult right) {
3261 if (left == right) return left;
3262 if (left == ACC_bottom) return right;
3263 if (right == ACC_bottom) return left;
3264 return ACC_invalid;
3265 }
3266
3267 /// A checker which white-lists certain expressions whose conversion
3268 /// to or from retainable type would otherwise be forbidden in ARC.
3269 class ARCCastChecker : public StmtVisitor<ARCCastChecker, ACCResult> {
3270 typedef StmtVisitor<ARCCastChecker, ACCResult> super;
3271
3272 ASTContext &Context;
3273 ARCConversionTypeClass SourceClass;
3274 ARCConversionTypeClass TargetClass;
3275 bool Diagnose;
3276
3277 static bool isCFType(QualType type) {
3278 // Someday this can use ns_bridged. For now, it has to do this.
3279 return type->isCARCBridgableType();
3280 }
3281
3282 public:
3283 ARCCastChecker(ASTContext &Context, ARCConversionTypeClass source,
3284 ARCConversionTypeClass target, bool diagnose)
3285 : Context(Context), SourceClass(source), TargetClass(target),
3286 Diagnose(diagnose) {}
3287
3288 using super::Visit;
3289 ACCResult Visit(Expr *e) {
3290 return super::Visit(e->IgnoreParens());
3291 }
3292
3293 ACCResult VisitStmt(Stmt *s) {
3294 return ACC_invalid;
3295 }
3296
3297 /// Null pointer constants can be casted however you please.
3298 ACCResult VisitExpr(Expr *e) {
3299 if (e->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull))
3300 return ACC_bottom;
3301 return ACC_invalid;
3302 }
3303
3304 /// Objective-C string literals can be safely casted.
3305 ACCResult VisitObjCStringLiteral(ObjCStringLiteral *e) {
3306 // If we're casting to any retainable type, go ahead. Global
3307 // strings are immune to retains, so this is bottom.
3308 if (isAnyRetainable(TargetClass)) return ACC_bottom;
3309
3310 return ACC_invalid;
3311 }
3312
3313 /// Look through certain implicit and explicit casts.
3314 ACCResult VisitCastExpr(CastExpr *e) {
3315 switch (e->getCastKind()) {
3316 case CK_NullToPointer:
3317 return ACC_bottom;
3318
3319 case CK_NoOp:
3320 case CK_LValueToRValue:
3321 case CK_BitCast:
3322 case CK_CPointerToObjCPointerCast:
3323 case CK_BlockPointerToObjCPointerCast:
3324 case CK_AnyPointerToBlockPointerCast:
3325 return Visit(e->getSubExpr());
3326
3327 default:
3328 return ACC_invalid;
3329 }
3330 }
3331
3332 /// Look through unary extension.
3333 ACCResult VisitUnaryExtension(UnaryOperator *e) {
3334 return Visit(e->getSubExpr());
3335 }
3336
3337 /// Ignore the LHS of a comma operator.
3338 ACCResult VisitBinComma(BinaryOperator *e) {
3339 return Visit(e->getRHS());
3340 }
3341
3342 /// Conditional operators are okay if both sides are okay.
3343 ACCResult VisitConditionalOperator(ConditionalOperator *e) {
3344 ACCResult left = Visit(e->getTrueExpr());
3345 if (left == ACC_invalid) return ACC_invalid;
3346 return merge(left, Visit(e->getFalseExpr()));
3347 }
3348
3349 /// Look through pseudo-objects.
3350 ACCResult VisitPseudoObjectExpr(PseudoObjectExpr *e) {
3351 // If we're getting here, we should always have a result.
3352 return Visit(e->getResultExpr());
3353 }
3354
3355 /// Statement expressions are okay if their result expression is okay.
3356 ACCResult VisitStmtExpr(StmtExpr *e) {
3357 return Visit(e->getSubStmt()->body_back());
3358 }
3359
3360 /// Some declaration references are okay.
3361 ACCResult VisitDeclRefExpr(DeclRefExpr *e) {
3362 VarDecl *var = dyn_cast<VarDecl>(e->getDecl());
3363 // References to global constants are okay.
3364 if (isAnyRetainable(TargetClass) &&
3365 isAnyRetainable(SourceClass) &&
3366 var &&
3367 !var->hasDefinition(Context) &&
3368 var->getType().isConstQualified()) {
3369
3370 // In system headers, they can also be assumed to be immune to retains.
3371 // These are things like 'kCFStringTransformToLatin'.
3372 if (Context.getSourceManager().isInSystemHeader(var->getLocation()))
3373 return ACC_bottom;
3374
3375 return ACC_plusZero;
3376 }
3377
3378 // Nothing else.
3379 return ACC_invalid;
3380 }
3381
3382 /// Some calls are okay.
3383 ACCResult VisitCallExpr(CallExpr *e) {
3384 if (FunctionDecl *fn = e->getDirectCallee())
3385 if (ACCResult result = checkCallToFunction(fn))
3386 return result;
3387
3388 return super::VisitCallExpr(e);
3389 }
3390
3391 ACCResult checkCallToFunction(FunctionDecl *fn) {
3392 // Require a CF*Ref return type.
3393 if (!isCFType(fn->getReturnType()))
3394 return ACC_invalid;
3395
3396 if (!isAnyRetainable(TargetClass))
3397 return ACC_invalid;
3398
3399 // Honor an explicit 'not retained' attribute.
3400 if (fn->hasAttr<CFReturnsNotRetainedAttr>())
3401 return ACC_plusZero;
3402
3403 // Honor an explicit 'retained' attribute, except that for
3404 // now we're not going to permit implicit handling of +1 results,
3405 // because it's a bit frightening.
3406 if (fn->hasAttr<CFReturnsRetainedAttr>())
3407 return Diagnose ? ACC_plusOne
3408 : ACC_invalid; // ACC_plusOne if we start accepting this
3409
3410 // Recognize this specific builtin function, which is used by CFSTR.
3411 unsigned builtinID = fn->getBuiltinID();
3412 if (builtinID == Builtin::BI__builtin___CFStringMakeConstantString)
3413 return ACC_bottom;
3414
3415 // Otherwise, don't do anything implicit with an unaudited function.
3416 if (!fn->hasAttr<CFAuditedTransferAttr>())
3417 return ACC_invalid;
3418
3419 // Otherwise, it's +0 unless it follows the create convention.
3420 if (ento::coreFoundation::followsCreateRule(fn))
3421 return Diagnose ? ACC_plusOne
3422 : ACC_invalid; // ACC_plusOne if we start accepting this
3423
3424 return ACC_plusZero;
3425 }
3426
3427 ACCResult VisitObjCMessageExpr(ObjCMessageExpr *e) {
3428 return checkCallToMethod(e->getMethodDecl());
3429 }
3430
3431 ACCResult VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *e) {
3432 ObjCMethodDecl *method;
3433 if (e->isExplicitProperty())
3434 method = e->getExplicitProperty()->getGetterMethodDecl();
3435 else
3436 method = e->getImplicitPropertyGetter();
3437 return checkCallToMethod(method);
3438 }
3439
3440 ACCResult checkCallToMethod(ObjCMethodDecl *method) {
3441 if (!method) return ACC_invalid;
3442
3443 // Check for message sends to functions returning CF types. We
3444 // just obey the Cocoa conventions with these, even though the
3445 // return type is CF.
3446 if (!isAnyRetainable(TargetClass) || !isCFType(method->getReturnType()))
3447 return ACC_invalid;
3448
3449 // If the method is explicitly marked not-retained, it's +0.
3450 if (method->hasAttr<CFReturnsNotRetainedAttr>())
3451 return ACC_plusZero;
3452
3453 // If the method is explicitly marked as returning retained, or its
3454 // selector follows a +1 Cocoa convention, treat it as +1.
3455 if (method->hasAttr<CFReturnsRetainedAttr>())
3456 return ACC_plusOne;
3457
3458 switch (method->getSelector().getMethodFamily()) {
3459 case OMF_alloc:
3460 case OMF_copy:
3461 case OMF_mutableCopy:
3462 case OMF_new:
3463 return ACC_plusOne;
3464
3465 default:
3466 // Otherwise, treat it as +0.
3467 return ACC_plusZero;
3468 }
3469 }
3470 };
3471} // end anonymous namespace
3472
3473bool Sema::isKnownName(StringRef name) {
3474 if (name.empty())
3475 return false;
3476 LookupResult R(*this, &Context.Idents.get(name), SourceLocation(),
3477 Sema::LookupOrdinaryName);
3478 return LookupName(R, TUScope, false);
3479}
3480
3481static void addFixitForObjCARCConversion(Sema &S,
3482 DiagnosticBuilder &DiagB,
3483 Sema::CheckedConversionKind CCK,
3484 SourceLocation afterLParen,
3485 QualType castType,
3486 Expr *castExpr,
3487 Expr *realCast,
3488 const char *bridgeKeyword,
3489 const char *CFBridgeName) {
3490 // We handle C-style and implicit casts here.
3491 switch (CCK) {
3492 case Sema::CCK_ImplicitConversion:
3493 case Sema::CCK_CStyleCast:
3494 case Sema::CCK_OtherCast:
3495 break;
3496 case Sema::CCK_FunctionalCast:
3497 return;
3498 }
3499
3500 if (CFBridgeName) {
3501 if (CCK == Sema::CCK_OtherCast) {
3502 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3503 SourceRange range(NCE->getOperatorLoc(),
3504 NCE->getAngleBrackets().getEnd());
3505 SmallString<32> BridgeCall;
3506
3507 SourceManager &SM = S.getSourceManager();
3508 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3509 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3510 BridgeCall += ' ';
3511
3512 BridgeCall += CFBridgeName;
3513 DiagB.AddFixItHint(FixItHint::CreateReplacement(range, BridgeCall));
3514 }
3515 return;
3516 }
3517 Expr *castedE = castExpr;
3518 if (CStyleCastExpr *CCE = dyn_cast<CStyleCastExpr>(castedE))
3519 castedE = CCE->getSubExpr();
3520 castedE = castedE->IgnoreImpCasts();
3521 SourceRange range = castedE->getSourceRange();
3522
3523 SmallString<32> BridgeCall;
3524
3525 SourceManager &SM = S.getSourceManager();
3526 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3527 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3528 BridgeCall += ' ';
3529
3530 BridgeCall += CFBridgeName;
3531
3532 if (isa<ParenExpr>(castedE)) {
3533 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3534 BridgeCall));
3535 } else {
3536 BridgeCall += '(';
3537 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3538 BridgeCall));
3539 DiagB.AddFixItHint(FixItHint::CreateInsertion(
3540 S.getLocForEndOfToken(range.getEnd()),
3541 ")"));
3542 }
3543 return;
3544 }
3545
3546 if (CCK == Sema::CCK_CStyleCast) {
3547 DiagB.AddFixItHint(FixItHint::CreateInsertion(afterLParen, bridgeKeyword));
3548 } else if (CCK == Sema::CCK_OtherCast) {
3549 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3550 std::string castCode = "(";
3551 castCode += bridgeKeyword;
3552 castCode += castType.getAsString();
3553 castCode += ")";
3554 SourceRange Range(NCE->getOperatorLoc(),
3555 NCE->getAngleBrackets().getEnd());
3556 DiagB.AddFixItHint(FixItHint::CreateReplacement(Range, castCode));
3557 }
3558 } else {
3559 std::string castCode = "(";
3560 castCode += bridgeKeyword;
3561 castCode += castType.getAsString();
3562 castCode += ")";
3563 Expr *castedE = castExpr->IgnoreImpCasts();
3564 SourceRange range = castedE->getSourceRange();
3565 if (isa<ParenExpr>(castedE)) {
3566 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3567 castCode));
3568 } else {
3569 castCode += "(";
3570 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3571 castCode));
3572 DiagB.AddFixItHint(FixItHint::CreateInsertion(
3573 S.getLocForEndOfToken(range.getEnd()),
3574 ")"));
3575 }
3576 }
3577}
3578
3579template <typename T>
3580static inline T *getObjCBridgeAttr(const TypedefType *TD) {
3581 TypedefNameDecl *TDNDecl = TD->getDecl();
3582 QualType QT = TDNDecl->getUnderlyingType();
3583 if (QT->isPointerType()) {
3584 QT = QT->getPointeeType();
3585 if (const RecordType *RT = QT->getAs<RecordType>())
3586 if (RecordDecl *RD = RT->getDecl()->getMostRecentDecl())
3587 return RD->getAttr<T>();
3588 }
3589 return nullptr;
3590}
3591
3592static ObjCBridgeRelatedAttr *ObjCBridgeRelatedAttrFromType(QualType T,
3593 TypedefNameDecl *&TDNDecl) {
3594 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3595 TDNDecl = TD->getDecl();
3596 if (ObjCBridgeRelatedAttr *ObjCBAttr =
3597 getObjCBridgeAttr<ObjCBridgeRelatedAttr>(TD))
3598 return ObjCBAttr;
3599 T = TDNDecl->getUnderlyingType();
3600 }
3601 return nullptr;
3602}
3603
3604static void
3605diagnoseObjCARCConversion(Sema &S, SourceRange castRange,
3606 QualType castType, ARCConversionTypeClass castACTC,
3607 Expr *castExpr, Expr *realCast,
3608 ARCConversionTypeClass exprACTC,
3609 Sema::CheckedConversionKind CCK) {
3610 SourceLocation loc =
3611 (castRange.isValid() ? castRange.getBegin() : castExpr->getExprLoc());
3612
3613 if (S.makeUnavailableInSystemHeader(loc,
3614 UnavailableAttr::IR_ARCForbiddenConversion))
3615 return;
3616
3617 QualType castExprType = castExpr->getType();
3618 // Defer emitting a diagnostic for bridge-related casts; that will be
3619 // handled by CheckObjCBridgeRelatedConversions.
3620 TypedefNameDecl *TDNDecl = nullptr;
3621 if ((castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable &&
3622 ObjCBridgeRelatedAttrFromType(castType, TDNDecl)) ||
3623 (exprACTC == ACTC_coreFoundation && castACTC == ACTC_retainable &&
3624 ObjCBridgeRelatedAttrFromType(castExprType, TDNDecl)))
3625 return;
3626
3627 unsigned srcKind = 0;
3628 switch (exprACTC) {
3629 case ACTC_none:
3630 case ACTC_coreFoundation:
3631 case ACTC_voidPtr:
3632 srcKind = (castExprType->isPointerType() ? 1 : 0);
3633 break;
3634 case ACTC_retainable:
3635 srcKind = (castExprType->isBlockPointerType() ? 2 : 3);
3636 break;
3637 case ACTC_indirectRetainable:
3638 srcKind = 4;
3639 break;
3640 }
3641
3642 // Check whether this could be fixed with a bridge cast.
3643 SourceLocation afterLParen = S.getLocForEndOfToken(castRange.getBegin());
3644 SourceLocation noteLoc = afterLParen.isValid() ? afterLParen : loc;
3645
3646 // Bridge from an ARC type to a CF type.
3647 if (castACTC == ACTC_retainable && isAnyRetainable(exprACTC)) {
3648
3649 S.Diag(loc, diag::err_arc_cast_requires_bridge)
3650 << unsigned(CCK == Sema::CCK_ImplicitConversion) // cast|implicit
3651 << 2 // of C pointer type
3652 << castExprType
3653 << unsigned(castType->isBlockPointerType()) // to ObjC|block type
3654 << castType
3655 << castRange
3656 << castExpr->getSourceRange();
3657 bool br = S.isKnownName("CFBridgingRelease");
3658 ACCResult CreateRule =
3659 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3660 assert(CreateRule != ACC_bottom && "This cast should already be accepted.")(static_cast <bool> (CreateRule != ACC_bottom &&
"This cast should already be accepted.") ? void (0) : __assert_fail
("CreateRule != ACC_bottom && \"This cast should already be accepted.\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 3660, __extension__ __PRETTY_FUNCTION__))
;
3661 if (CreateRule != ACC_plusOne)
3662 {
3663 DiagnosticBuilder DiagB =
3664 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3665 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3666
3667 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3668 castType, castExpr, realCast, "__bridge ",
3669 nullptr);
3670 }
3671 if (CreateRule != ACC_plusZero)
3672 {
3673 DiagnosticBuilder DiagB =
3674 (CCK == Sema::CCK_OtherCast && !br) ?
3675 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_transfer) << castExprType :
3676 S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3677 diag::note_arc_bridge_transfer)
3678 << castExprType << br;
3679
3680 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3681 castType, castExpr, realCast, "__bridge_transfer ",
3682 br ? "CFBridgingRelease" : nullptr);
3683 }
3684
3685 return;
3686 }
3687
3688 // Bridge from a CF type to an ARC type.
3689 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC)) {
3690 bool br = S.isKnownName("CFBridgingRetain");
3691 S.Diag(loc, diag::err_arc_cast_requires_bridge)
3692 << unsigned(CCK == Sema::CCK_ImplicitConversion) // cast|implicit
3693 << unsigned(castExprType->isBlockPointerType()) // of ObjC|block type
3694 << castExprType
3695 << 2 // to C pointer type
3696 << castType
3697 << castRange
3698 << castExpr->getSourceRange();
3699 ACCResult CreateRule =
3700 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3701 assert(CreateRule != ACC_bottom && "This cast should already be accepted.")(static_cast <bool> (CreateRule != ACC_bottom &&
"This cast should already be accepted.") ? void (0) : __assert_fail
("CreateRule != ACC_bottom && \"This cast should already be accepted.\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 3701, __extension__ __PRETTY_FUNCTION__))
;
3702 if (CreateRule != ACC_plusOne)
3703 {
3704 DiagnosticBuilder DiagB =
3705 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3706 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3707 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3708 castType, castExpr, realCast, "__bridge ",
3709 nullptr);
3710 }
3711 if (CreateRule != ACC_plusZero)
3712 {
3713 DiagnosticBuilder DiagB =
3714 (CCK == Sema::CCK_OtherCast && !br) ?
3715 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_retained) << castType :
3716 S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3717 diag::note_arc_bridge_retained)
3718 << castType << br;
3719
3720 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3721 castType, castExpr, realCast, "__bridge_retained ",
3722 br ? "CFBridgingRetain" : nullptr);
3723 }
3724
3725 return;
3726 }
3727
3728 S.Diag(loc, diag::err_arc_mismatched_cast)
3729 << (CCK != Sema::CCK_ImplicitConversion)
3730 << srcKind << castExprType << castType
3731 << castRange << castExpr->getSourceRange();
3732}
3733
3734template <typename TB>
3735static bool CheckObjCBridgeNSCast(Sema &S, QualType castType, Expr *castExpr,
3736 bool &HadTheAttribute, bool warn) {
3737 QualType T = castExpr->getType();
3738 HadTheAttribute = false;
3739 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3740 TypedefNameDecl *TDNDecl = TD->getDecl();
3741 if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3742 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3743 HadTheAttribute = true;
3744 if (Parm->isStr("id"))
3745 return true;
3746
3747 NamedDecl *Target = nullptr;
3748 // Check for an existing type with this name.
3749 LookupResult R(S, DeclarationName(Parm), SourceLocation(),
3750 Sema::LookupOrdinaryName);
3751 if (S.LookupName(R, S.TUScope)) {
3752 Target = R.getFoundDecl();
3753 if (Target && isa<ObjCInterfaceDecl>(Target)) {
3754 ObjCInterfaceDecl *ExprClass = cast<ObjCInterfaceDecl>(Target);
3755 if (const ObjCObjectPointerType *InterfacePointerType =
3756 castType->getAsObjCInterfacePointerType()) {
3757 ObjCInterfaceDecl *CastClass
3758 = InterfacePointerType->getObjectType()->getInterface();
3759 if ((CastClass == ExprClass) ||
3760 (CastClass && CastClass->isSuperClassOf(ExprClass)))
3761 return true;
3762 if (warn)
3763 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge)
3764 << T << Target->getName() << castType->getPointeeType();
3765 return false;
3766 } else if (castType->isObjCIdType() ||
3767 (S.Context.ObjCObjectAdoptsQTypeProtocols(
3768 castType, ExprClass)))
3769 // ok to cast to 'id'.
3770 // casting to id<p-list> is ok if bridge type adopts all of
3771 // p-list protocols.
3772 return true;
3773 else {
3774 if (warn) {
3775 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge)
3776 << T << Target->getName() << castType;
3777 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3778 S.Diag(Target->getLocStart(), diag::note_declared_at);
3779 }
3780 return false;
3781 }
3782 }
3783 } else if (!castType->isObjCIdType()) {
3784 S.Diag(castExpr->getLocStart(), diag::err_objc_cf_bridged_not_interface)
3785 << castExpr->getType() << Parm;
3786 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3787 if (Target)
3788 S.Diag(Target->getLocStart(), diag::note_declared_at);
3789 }
3790 return true;
3791 }
3792 return false;
3793 }
3794 T = TDNDecl->getUnderlyingType();
3795 }
3796 return true;
3797}
3798
3799template <typename TB>
3800static bool CheckObjCBridgeCFCast(Sema &S, QualType castType, Expr *castExpr,
3801 bool &HadTheAttribute, bool warn) {
3802 QualType T = castType;
3803 HadTheAttribute = false;
3804 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3805 TypedefNameDecl *TDNDecl = TD->getDecl();
3806 if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3807 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3808 HadTheAttribute = true;
3809 if (Parm->isStr("id"))
3810 return true;
3811
3812 NamedDecl *Target = nullptr;
3813 // Check for an existing type with this name.
3814 LookupResult R(S, DeclarationName(Parm), SourceLocation(),
3815 Sema::LookupOrdinaryName);
3816 if (S.LookupName(R, S.TUScope)) {
3817 Target = R.getFoundDecl();
3818 if (Target && isa<ObjCInterfaceDecl>(Target)) {
3819 ObjCInterfaceDecl *CastClass = cast<ObjCInterfaceDecl>(Target);
3820 if (const ObjCObjectPointerType *InterfacePointerType =
3821 castExpr->getType()->getAsObjCInterfacePointerType()) {
3822 ObjCInterfaceDecl *ExprClass
3823 = InterfacePointerType->getObjectType()->getInterface();
3824 if ((CastClass == ExprClass) ||
3825 (ExprClass && CastClass->isSuperClassOf(ExprClass)))
3826 return true;
3827 if (warn) {
3828 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge_to_cf)
3829 << castExpr->getType()->getPointeeType() << T;
3830 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3831 }
3832 return false;
3833 } else if (castExpr->getType()->isObjCIdType() ||
3834 (S.Context.QIdProtocolsAdoptObjCObjectProtocols(
3835 castExpr->getType(), CastClass)))
3836 // ok to cast an 'id' expression to a CFtype.
3837 // ok to cast an 'id<plist>' expression to CFtype provided plist
3838 // adopts all of CFtype's ObjetiveC's class plist.
3839 return true;
3840 else {
3841 if (warn) {
3842 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge_to_cf)
3843 << castExpr->getType() << castType;
3844 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3845 S.Diag(Target->getLocStart(), diag::note_declared_at);
3846 }
3847 return false;
3848 }
3849 }
3850 }
3851 S.Diag(castExpr->getLocStart(), diag::err_objc_ns_bridged_invalid_cfobject)
3852 << castExpr->getType() << castType;
3853 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3854 if (Target)
3855 S.Diag(Target->getLocStart(), diag::note_declared_at);
3856 return true;
3857 }
3858 return false;
3859 }
3860 T = TDNDecl->getUnderlyingType();
3861 }
3862 return true;
3863}
3864
3865void Sema::CheckTollFreeBridgeCast(QualType castType, Expr *castExpr) {
3866 if (!getLangOpts().ObjC1)
3867 return;
3868 // warn in presence of __bridge casting to or from a toll free bridge cast.
3869 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExpr->getType());
3870 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType);
3871 if (castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) {
3872 bool HasObjCBridgeAttr;
3873 bool ObjCBridgeAttrWillNotWarn =
3874 CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3875 false);
3876 if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
3877 return;
3878 bool HasObjCBridgeMutableAttr;
3879 bool ObjCBridgeMutableAttrWillNotWarn =
3880 CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3881 HasObjCBridgeMutableAttr, false);
3882 if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
3883 return;
3884
3885 if (HasObjCBridgeAttr)
3886 CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3887 true);
3888 else if (HasObjCBridgeMutableAttr)
3889 CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3890 HasObjCBridgeMutableAttr, true);
3891 }
3892 else if (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable) {
3893 bool HasObjCBridgeAttr;
3894 bool ObjCBridgeAttrWillNotWarn =
3895 CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3896 false);
3897 if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
3898 return;
3899 bool HasObjCBridgeMutableAttr;
3900 bool ObjCBridgeMutableAttrWillNotWarn =
3901 CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3902 HasObjCBridgeMutableAttr, false);
3903 if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
3904 return;
3905
3906 if (HasObjCBridgeAttr)
3907 CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3908 true);
3909 else if (HasObjCBridgeMutableAttr)
3910 CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3911 HasObjCBridgeMutableAttr, true);
3912 }
3913}
3914
3915void Sema::CheckObjCBridgeRelatedCast(QualType castType, Expr *castExpr) {
3916 QualType SrcType = castExpr->getType();
3917 if (ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(castExpr)) {
3918 if (PRE->isExplicitProperty()) {
3919 if (ObjCPropertyDecl *PDecl = PRE->getExplicitProperty())
3920 SrcType = PDecl->getType();
3921 }
3922 else if (PRE->isImplicitProperty()) {
3923 if (ObjCMethodDecl *Getter = PRE->getImplicitPropertyGetter())
3924 SrcType = Getter->getReturnType();
3925 }
3926 }
3927
3928 ARCConversionTypeClass srcExprACTC = classifyTypeForARCConversion(SrcType);
3929 ARCConversionTypeClass castExprACTC = classifyTypeForARCConversion(castType);
3930 if (srcExprACTC != ACTC_retainable || castExprACTC != ACTC_coreFoundation)
3931 return;
3932 CheckObjCBridgeRelatedConversions(castExpr->getLocStart(),
3933 castType, SrcType, castExpr);
3934}
3935
3936bool Sema::CheckTollFreeBridgeStaticCast(QualType castType, Expr *castExpr,
3937 CastKind &Kind) {
3938 if (!getLangOpts().ObjC1)
3939 return false;
3940 ARCConversionTypeClass exprACTC =
3941 classifyTypeForARCConversion(castExpr->getType());
3942 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType);
3943 if ((castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) ||
3944 (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable)) {
3945 CheckTollFreeBridgeCast(castType, castExpr);
3946 Kind = (castACTC == ACTC_coreFoundation) ? CK_BitCast
3947 : CK_CPointerToObjCPointerCast;
3948 return true;
3949 }
3950 return false;
3951}
3952
3953bool Sema::checkObjCBridgeRelatedComponents(SourceLocation Loc,
3954 QualType DestType, QualType SrcType,
3955 ObjCInterfaceDecl *&RelatedClass,
3956 ObjCMethodDecl *&ClassMethod,
3957 ObjCMethodDecl *&InstanceMethod,
3958 TypedefNameDecl *&TDNDecl,
3959 bool CfToNs, bool Diagnose) {
3960 QualType T = CfToNs ? SrcType : DestType;
3961 ObjCBridgeRelatedAttr *ObjCBAttr = ObjCBridgeRelatedAttrFromType(T, TDNDecl);
3962 if (!ObjCBAttr)
3963 return false;
3964
3965 IdentifierInfo *RCId = ObjCBAttr->getRelatedClass();
3966 IdentifierInfo *CMId = ObjCBAttr->getClassMethod();
3967 IdentifierInfo *IMId = ObjCBAttr->getInstanceMethod();
3968 if (!RCId)
3969 return false;
3970 NamedDecl *Target = nullptr;
3971 // Check for an existing type with this name.
3972 LookupResult R(*this, DeclarationName(RCId), SourceLocation(),
3973 Sema::LookupOrdinaryName);
3974 if (!LookupName(R, TUScope)) {
3975 if (Diagnose) {
3976 Diag(Loc, diag::err_objc_bridged_related_invalid_class) << RCId
3977 << SrcType << DestType;
3978 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3979 }
3980 return false;
3981 }
3982 Target = R.getFoundDecl();
3983 if (Target && isa<ObjCInterfaceDecl>(Target))
3984 RelatedClass = cast<ObjCInterfaceDecl>(Target);
3985 else {
3986 if (Diagnose) {
3987 Diag(Loc, diag::err_objc_bridged_related_invalid_class_name) << RCId
3988 << SrcType << DestType;
3989 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3990 if (Target)
3991 Diag(Target->getLocStart(), diag::note_declared_at);
3992 }
3993 return false;
3994 }
3995
3996 // Check for an existing class method with the given selector name.
3997 if (CfToNs && CMId) {
3998 Selector Sel = Context.Selectors.getUnarySelector(CMId);
3999 ClassMethod = RelatedClass->lookupMethod(Sel, false);
4000 if (!ClassMethod) {
4001 if (Diagnose) {
4002 Diag(Loc, diag::err_objc_bridged_related_known_method)
4003 << SrcType << DestType << Sel << false;
4004 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
4005 }
4006 return false;
4007 }
4008 }
4009
4010 // Check for an existing instance method with the given selector name.
4011 if (!CfToNs && IMId) {
4012 Selector Sel = Context.Selectors.getNullarySelector(IMId);
4013 InstanceMethod = RelatedClass->lookupMethod(Sel, true);
4014 if (!InstanceMethod) {
4015 if (Diagnose) {
4016 Diag(Loc, diag::err_objc_bridged_related_known_method)
4017 << SrcType << DestType << Sel << true;
4018 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
4019 }
4020 return false;
4021 }
4022 }
4023 return true;
4024}
4025
4026bool
4027Sema::CheckObjCBridgeRelatedConversions(SourceLocation Loc,
4028 QualType DestType, QualType SrcType,
4029 Expr *&SrcExpr, bool Diagnose) {
4030 ARCConversionTypeClass rhsExprACTC = classifyTypeForARCConversion(SrcType);
4031 ARCConversionTypeClass lhsExprACTC = classifyTypeForARCConversion(DestType);
4032 bool CfToNs = (rhsExprACTC == ACTC_coreFoundation && lhsExprACTC == ACTC_retainable);
4033 bool NsToCf = (rhsExprACTC == ACTC_retainable && lhsExprACTC == ACTC_coreFoundation);
4034 if (!CfToNs && !NsToCf)
4035 return false;
4036
4037 ObjCInterfaceDecl *RelatedClass;
4038 ObjCMethodDecl *ClassMethod = nullptr;
4039 ObjCMethodDecl *InstanceMethod = nullptr;
4040 TypedefNameDecl *TDNDecl = nullptr;
4041 if (!checkObjCBridgeRelatedComponents(Loc, DestType, SrcType, RelatedClass,
4042 ClassMethod, InstanceMethod, TDNDecl,
4043 CfToNs, Diagnose))
4044 return false;
4045
4046 if (CfToNs) {
4047 // Implicit conversion from CF to ObjC object is needed.
4048 if (ClassMethod) {
4049 if (Diagnose) {
4050 std::string ExpressionString = "[";
4051 ExpressionString += RelatedClass->getNameAsString();
4052 ExpressionString += " ";
4053 ExpressionString += ClassMethod->getSelector().getAsString();
4054 SourceLocation SrcExprEndLoc = getLocForEndOfToken(SrcExpr->getLocEnd());
4055 // Provide a fixit: [RelatedClass ClassMethod SrcExpr]
4056 Diag(Loc, diag::err_objc_bridged_related_known_method)
4057 << SrcType << DestType << ClassMethod->getSelector() << false
4058 << FixItHint::CreateInsertion(SrcExpr->getLocStart(), ExpressionString)
4059 << FixItHint::CreateInsertion(SrcExprEndLoc, "]");
4060 Diag(RelatedClass->getLocStart(), diag::note_declared_at);
4061 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
4062
4063 QualType receiverType = Context.getObjCInterfaceType(RelatedClass);
4064 // Argument.
4065 Expr *args[] = { SrcExpr };
4066 ExprResult msg = BuildClassMessageImplicit(receiverType, false,
4067 ClassMethod->getLocation(),
4068 ClassMethod->getSelector(), ClassMethod,
4069 MultiExprArg(args, 1));
4070 SrcExpr = msg.get();
4071 }
4072 return true;
4073 }
4074 }
4075 else {
4076 // Implicit conversion from ObjC type to CF object is needed.
4077 if (InstanceMethod) {
4078 if (Diagnose) {
4079 std::string ExpressionString;
4080 SourceLocation SrcExprEndLoc =
4081 getLocForEndOfToken(SrcExpr->getLocEnd());
4082 if (InstanceMethod->isPropertyAccessor())
4083 if (const ObjCPropertyDecl *PDecl =
4084 InstanceMethod->findPropertyDecl()) {
4085 // fixit: ObjectExpr.propertyname when it is aproperty accessor.
4086 ExpressionString = ".";
4087 ExpressionString += PDecl->getNameAsString();
4088 Diag(Loc, diag::err_objc_bridged_related_known_method)
4089 << SrcType << DestType << InstanceMethod->getSelector() << true
4090 << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
4091 }
4092 if (ExpressionString.empty()) {
4093 // Provide a fixit: [ObjectExpr InstanceMethod]
4094 ExpressionString = " ";
4095 ExpressionString += InstanceMethod->getSelector().getAsString();
4096 ExpressionString += "]";
4097
4098 Diag(Loc, diag::err_objc_bridged_related_known_method)
4099 << SrcType << DestType << InstanceMethod->getSelector() << true
4100 << FixItHint::CreateInsertion(SrcExpr->getLocStart(), "[")
4101 << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
4102 }
4103 Diag(RelatedClass->getLocStart(), diag::note_declared_at);
4104 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
4105
4106 ExprResult msg =
4107 BuildInstanceMessageImplicit(SrcExpr, SrcType,
4108 InstanceMethod->getLocation(),
4109 InstanceMethod->getSelector(),
4110 InstanceMethod, None);
4111 SrcExpr = msg.get();
4112 }
4113 return true;
4114 }
4115 }
4116 return false;
4117}
4118
4119Sema::ARCConversionResult
4120Sema::CheckObjCConversion(SourceRange castRange, QualType castType,
4121 Expr *&castExpr, CheckedConversionKind CCK,
4122 bool Diagnose, bool DiagnoseCFAudited,
4123 BinaryOperatorKind Opc) {
4124 QualType castExprType = castExpr->getType();
4125
4126 // For the purposes of the classification, we assume reference types
4127 // will bind to temporaries.
4128 QualType effCastType = castType;
4129 if (const ReferenceType *ref = castType->getAs<ReferenceType>())
4130 effCastType = ref->getPointeeType();
4131
4132 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExprType);
4133 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(effCastType);
4134 if (exprACTC == castACTC) {
4135 // Check for viability and report error if casting an rvalue to a
4136 // life-time qualifier.
4137 if (castACTC == ACTC_retainable &&
4138 (CCK == CCK_CStyleCast || CCK == CCK_OtherCast) &&
4139 castType != castExprType) {
4140 const Type *DT = castType.getTypePtr();
4141 QualType QDT = castType;
4142 // We desugar some types but not others. We ignore those
4143 // that cannot happen in a cast; i.e. auto, and those which
4144 // should not be de-sugared; i.e typedef.
4145 if (const ParenType *PT = dyn_cast<ParenType>(DT))
4146 QDT = PT->desugar();
4147 else if (const TypeOfType *TP = dyn_cast<TypeOfType>(DT))
4148 QDT = TP->desugar();
4149 else if (const AttributedType *AT = dyn_cast<AttributedType>(DT))
4150 QDT = AT->desugar();
4151 if (QDT != castType &&
4152 QDT.getObjCLifetime() != Qualifiers::OCL_None) {
4153 if (Diagnose) {
4154 SourceLocation loc = (castRange.isValid() ? castRange.getBegin()
4155 : castExpr->getExprLoc());
4156 Diag(loc, diag::err_arc_nolifetime_behavior);
4157 }
4158 return ACR_error;
4159 }
4160 }
4161 return ACR_okay;
4162 }
4163
4164 // The life-time qualifier cast check above is all we need for ObjCWeak.
4165 // ObjCAutoRefCount has more restrictions on what is legal.
4166 if (!getLangOpts().ObjCAutoRefCount)
4167 return ACR_okay;
4168
4169 if (isAnyCLike(exprACTC) && isAnyCLike(castACTC)) return ACR_okay;
4170
4171 // Allow all of these types to be cast to integer types (but not
4172 // vice-versa).
4173 if (castACTC == ACTC_none && castType->isIntegralType(Context))
4174 return ACR_okay;
4175
4176 // Allow casts between pointers to lifetime types (e.g., __strong id*)
4177 // and pointers to void (e.g., cv void *). Casting from void* to lifetime*
4178 // must be explicit.
4179 if (exprACTC == ACTC_indirectRetainable && castACTC == ACTC_voidPtr)
4180 return ACR_okay;
4181 if (castACTC == ACTC_indirectRetainable && exprACTC == ACTC_voidPtr &&
4182 CCK != CCK_ImplicitConversion)
4183 return ACR_okay;
4184
4185 switch (ARCCastChecker(Context, exprACTC, castACTC, false).Visit(castExpr)) {
4186 // For invalid casts, fall through.
4187 case ACC_invalid:
4188 break;
4189
4190 // Do nothing for both bottom and +0.
4191 case ACC_bottom:
4192 case ACC_plusZero:
4193 return ACR_okay;
4194
4195 // If the result is +1, consume it here.
4196 case ACC_plusOne:
4197 castExpr = ImplicitCastExpr::Create(Context, castExpr->getType(),
4198 CK_ARCConsumeObject, castExpr,
4199 nullptr, VK_RValue);
4200 Cleanup.setExprNeedsCleanups(true);
4201 return ACR_okay;
4202 }
4203
4204 // If this is a non-implicit cast from id or block type to a
4205 // CoreFoundation type, delay complaining in case the cast is used
4206 // in an acceptable context.
4207 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC) &&
4208 CCK != CCK_ImplicitConversion)
4209 return ACR_unbridged;
4210
4211 // Issue a diagnostic about a missing @-sign when implicit casting a cstring
4212 // to 'NSString *', instead of falling through to report a "bridge cast"
4213 // diagnostic.
4214 if (castACTC == ACTC_retainable && exprACTC == ACTC_none &&
4215 ConversionToObjCStringLiteralCheck(castType, castExpr, Diagnose))
4216 return ACR_error;
4217
4218 // Do not issue "bridge cast" diagnostic when implicit casting
4219 // a retainable object to a CF type parameter belonging to an audited
4220 // CF API function. Let caller issue a normal type mismatched diagnostic
4221 // instead.
4222 if ((!DiagnoseCFAudited || exprACTC != ACTC_retainable ||
4223 castACTC != ACTC_coreFoundation) &&
4224 !(exprACTC == ACTC_voidPtr && castACTC == ACTC_retainable &&
4225 (Opc == BO_NE || Opc == BO_EQ))) {
4226 if (Diagnose)
4227 diagnoseObjCARCConversion(*this, castRange, castType, castACTC, castExpr,
4228 castExpr, exprACTC, CCK);
4229 return ACR_error;
4230 }
4231 return ACR_okay;
4232}
4233
4234/// Given that we saw an expression with the ARCUnbridgedCastTy
4235/// placeholder type, complain bitterly.
4236void Sema::diagnoseARCUnbridgedCast(Expr *e) {
4237 // We expect the spurious ImplicitCastExpr to already have been stripped.
4238 assert(!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast))(static_cast <bool> (!e->hasPlaceholderType(BuiltinType
::ARCUnbridgedCast)) ? void (0) : __assert_fail ("!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast)"
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4238, __extension__ __PRETTY_FUNCTION__))
;
4239 CastExpr *realCast = cast<CastExpr>(e->IgnoreParens());
4240
4241 SourceRange castRange;
4242 QualType castType;
4243 CheckedConversionKind CCK;
4244
4245 if (CStyleCastExpr *cast = dyn_cast<CStyleCastExpr>(realCast)) {
4246 castRange = SourceRange(cast->getLParenLoc(), cast->getRParenLoc());
4247 castType = cast->getTypeAsWritten();
4248 CCK = CCK_CStyleCast;
4249 } else if (ExplicitCastExpr *cast = dyn_cast<ExplicitCastExpr>(realCast)) {
4250 castRange = cast->getTypeInfoAsWritten()->getTypeLoc().getSourceRange();
4251 castType = cast->getTypeAsWritten();
4252 CCK = CCK_OtherCast;
4253 } else {
4254 llvm_unreachable("Unexpected ImplicitCastExpr")::llvm::llvm_unreachable_internal("Unexpected ImplicitCastExpr"
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4254)
;
4255 }
4256
4257 ARCConversionTypeClass castACTC =
4258 classifyTypeForARCConversion(castType.getNonReferenceType());
4259
4260 Expr *castExpr = realCast->getSubExpr();
4261 assert(classifyTypeForARCConversion(castExpr->getType()) == ACTC_retainable)(static_cast <bool> (classifyTypeForARCConversion(castExpr
->getType()) == ACTC_retainable) ? void (0) : __assert_fail
("classifyTypeForARCConversion(castExpr->getType()) == ACTC_retainable"
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4261, __extension__ __PRETTY_FUNCTION__))
;
4262
4263 diagnoseObjCARCConversion(*this, castRange, castType, castACTC,
4264 castExpr, realCast, ACTC_retainable, CCK);
4265}
4266
4267/// stripARCUnbridgedCast - Given an expression of ARCUnbridgedCast
4268/// type, remove the placeholder cast.
4269Expr *Sema::stripARCUnbridgedCast(Expr *e) {
4270 assert(e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast))(static_cast <bool> (e->hasPlaceholderType(BuiltinType
::ARCUnbridgedCast)) ? void (0) : __assert_fail ("e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast)"
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4270, __extension__ __PRETTY_FUNCTION__))
;
4271
4272 if (ParenExpr *pe = dyn_cast<ParenExpr>(e)) {
4273 Expr *sub = stripARCUnbridgedCast(pe->getSubExpr());
4274 return new (Context) ParenExpr(pe->getLParen(), pe->getRParen(), sub);
4275 } else if (UnaryOperator *uo = dyn_cast<UnaryOperator>(e)) {
4276 assert(uo->getOpcode() == UO_Extension)(static_cast <bool> (uo->getOpcode() == UO_Extension
) ? void (0) : __assert_fail ("uo->getOpcode() == UO_Extension"
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4276, __extension__ __PRETTY_FUNCTION__))
;
4277 Expr *sub = stripARCUnbridgedCast(uo->getSubExpr());
4278 return new (Context) UnaryOperator(sub, UO_Extension, sub->getType(),
4279 sub->getValueKind(), sub->getObjectKind(),
4280 uo->getOperatorLoc());
4281 } else if (GenericSelectionExpr *gse = dyn_cast<GenericSelectionExpr>(e)) {
4282 assert(!gse->isResultDependent())(static_cast <bool> (!gse->isResultDependent()) ? void
(0) : __assert_fail ("!gse->isResultDependent()", "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4282, __extension__ __PRETTY_FUNCTION__))
;
4283
4284 unsigned n = gse->getNumAssocs();
4285 SmallVector<Expr*, 4> subExprs(n);
4286 SmallVector<TypeSourceInfo*, 4> subTypes(n);
4287 for (unsigned i = 0; i != n; ++i) {
4288 subTypes[i] = gse->getAssocTypeSourceInfo(i);
4289 Expr *sub = gse->getAssocExpr(i);
4290 if (i == gse->getResultIndex())
4291 sub = stripARCUnbridgedCast(sub);
4292 subExprs[i] = sub;
4293 }
4294
4295 return new (Context) GenericSelectionExpr(Context, gse->getGenericLoc(),
4296 gse->getControllingExpr(),
4297 subTypes, subExprs,
4298 gse->getDefaultLoc(),
4299 gse->getRParenLoc(),
4300 gse->containsUnexpandedParameterPack(),
4301 gse->getResultIndex());
4302 } else {
4303 assert(isa<ImplicitCastExpr>(e) && "bad form of unbridged cast!")(static_cast <bool> (isa<ImplicitCastExpr>(e) &&
"bad form of unbridged cast!") ? void (0) : __assert_fail ("isa<ImplicitCastExpr>(e) && \"bad form of unbridged cast!\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4303, __extension__ __PRETTY_FUNCTION__))
;
4304 return cast<ImplicitCastExpr>(e)->getSubExpr();
4305 }
4306}
4307
4308bool Sema::CheckObjCARCUnavailableWeakConversion(QualType castType,
4309 QualType exprType) {
4310 QualType canCastType =
4311 Context.getCanonicalType(castType).getUnqualifiedType();
4312 QualType canExprType =
4313 Context.getCanonicalType(exprType).getUnqualifiedType();
4314 if (isa<ObjCObjectPointerType>(canCastType) &&
4315 castType.getObjCLifetime() == Qualifiers::OCL_Weak &&
4316 canExprType->isObjCObjectPointerType()) {
4317 if (const ObjCObjectPointerType *ObjT =
4318 canExprType->getAs<ObjCObjectPointerType>())
4319 if (const ObjCInterfaceDecl *ObjI = ObjT->getInterfaceDecl())
4320 return !ObjI->isArcWeakrefUnavailable();
4321 }
4322 return true;
4323}
4324
4325/// Look for an ObjCReclaimReturnedObject cast and destroy it.
4326static Expr *maybeUndoReclaimObject(Expr *e) {
4327 Expr *curExpr = e, *prevExpr = nullptr;
4328
4329 // Walk down the expression until we hit an implicit cast of kind
4330 // ARCReclaimReturnedObject or an Expr that is neither a Paren nor a Cast.
4331 while (true) {
4332 if (auto *pe = dyn_cast<ParenExpr>(curExpr)) {
4333 prevExpr = curExpr;
4334 curExpr = pe->getSubExpr();
4335 continue;
4336 }
4337
4338 if (auto *ce = dyn_cast<CastExpr>(curExpr)) {
4339 if (auto *ice = dyn_cast<ImplicitCastExpr>(ce))
4340 if (ice->getCastKind() == CK_ARCReclaimReturnedObject) {
4341 if (!prevExpr)
4342 return ice->getSubExpr();
4343 if (auto *pe = dyn_cast<ParenExpr>(prevExpr))
4344 pe->setSubExpr(ice->getSubExpr());
4345 else
4346 cast<CastExpr>(prevExpr)->setSubExpr(ice->getSubExpr());
4347 return e;
4348 }
4349
4350 prevExpr = curExpr;
4351 curExpr = ce->getSubExpr();
4352 continue;
4353 }
4354
4355 // Break out of the loop if curExpr is neither a Paren nor a Cast.
4356 break;
4357 }
4358
4359 return e;
4360}
4361
4362ExprResult Sema::BuildObjCBridgedCast(SourceLocation LParenLoc,
4363 ObjCBridgeCastKind Kind,
4364 SourceLocation BridgeKeywordLoc,
4365 TypeSourceInfo *TSInfo,
4366 Expr *SubExpr) {
4367 ExprResult SubResult = UsualUnaryConversions(SubExpr);
4368 if (SubResult.isInvalid()) return ExprError();
4369 SubExpr = SubResult.get();
4370
4371 QualType T = TSInfo->getType();
4372 QualType FromType = SubExpr->getType();
4373
4374 CastKind CK;
4375
4376 bool MustConsume = false;
4377 if (T->isDependentType() || SubExpr->isTypeDependent()) {
4378 // Okay: we'll build a dependent expression type.
4379 CK = CK_Dependent;
4380 } else if (T->isObjCARCBridgableType() && FromType->isCARCBridgableType()) {
4381 // Casting CF -> id
4382 CK = (T->isBlockPointerType() ? CK_AnyPointerToBlockPointerCast
4383 : CK_CPointerToObjCPointerCast);
4384 switch (Kind) {
4385 case OBC_Bridge:
4386 break;
4387
4388 case OBC_BridgeRetained: {
4389 bool br = isKnownName("CFBridgingRelease");
4390 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4391 << 2
4392 << FromType
4393 << (T->isBlockPointerType()? 1 : 0)
4394 << T
4395 << SubExpr->getSourceRange()
4396 << Kind;
4397 Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4398 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge");
4399 Diag(BridgeKeywordLoc, diag::note_arc_bridge_transfer)
4400 << FromType << br
4401 << FixItHint::CreateReplacement(BridgeKeywordLoc,
4402 br ? "CFBridgingRelease "
4403 : "__bridge_transfer ");
4404
4405 Kind = OBC_Bridge;
4406 break;
4407 }
4408
4409 case OBC_BridgeTransfer:
4410 // We must consume the Objective-C object produced by the cast.
4411 MustConsume = true;
4412 break;
4413 }
4414 } else if (T->isCARCBridgableType() && FromType->isObjCARCBridgableType()) {
4415 // Okay: id -> CF
4416 CK = CK_BitCast;
4417 switch (Kind) {
4418 case OBC_Bridge:
4419 // Reclaiming a value that's going to be __bridge-casted to CF
4420 // is very dangerous, so we don't do it.
4421 SubExpr = maybeUndoReclaimObject(SubExpr);
4422 break;
4423
4424 case OBC_BridgeRetained:
4425 // Produce the object before casting it.
4426 SubExpr = ImplicitCastExpr::Create(Context, FromType,
4427 CK_ARCProduceObject,
4428 SubExpr, nullptr, VK_RValue);
4429 break;
4430
4431 case OBC_BridgeTransfer: {
4432 bool br = isKnownName("CFBridgingRetain");
4433 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4434 << (FromType->isBlockPointerType()? 1 : 0)
4435 << FromType
4436 << 2
4437 << T
4438 << SubExpr->getSourceRange()
4439 << Kind;
4440
4441 Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4442 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge ");
4443 Diag(BridgeKeywordLoc, diag::note_arc_bridge_retained)
4444 << T << br
4445 << FixItHint::CreateReplacement(BridgeKeywordLoc,
4446 br ? "CFBridgingRetain " : "__bridge_retained");
4447
4448 Kind = OBC_Bridge;
4449 break;
4450 }
4451 }
4452 } else {
4453 Diag(LParenLoc, diag::err_arc_bridge_cast_incompatible)
4454 << FromType << T << Kind
4455 << SubExpr->getSourceRange()
4456 << TSInfo->getTypeLoc().getSourceRange();
4457 return ExprError();
4458 }
4459
4460 Expr *Result = new (Context) ObjCBridgedCastExpr(LParenLoc, Kind, CK,
4461 BridgeKeywordLoc,
4462 TSInfo, SubExpr);
4463
4464 if (MustConsume) {
4465 Cleanup.setExprNeedsCleanups(true);
4466 Result = ImplicitCastExpr::Create(Context, T, CK_ARCConsumeObject, Result,
4467 nullptr, VK_RValue);
4468 }
4469
4470 return Result;
4471}
4472
4473ExprResult Sema::ActOnObjCBridgedCast(Scope *S,
4474 SourceLocation LParenLoc,
4475 ObjCBridgeCastKind Kind,
4476 SourceLocation BridgeKeywordLoc,
4477 ParsedType Type,
4478 SourceLocation RParenLoc,
4479 Expr *SubExpr) {
4480 TypeSourceInfo *TSInfo = nullptr;
4481 QualType T = GetTypeFromParser(Type, &TSInfo);
4482 if (Kind == OBC_Bridge)
4483 CheckTollFreeBridgeCast(T, SubExpr);
4484 if (!TSInfo)
4485 TSInfo = Context.getTrivialTypeSourceInfo(T, LParenLoc);
4486 return BuildObjCBridgedCast(LParenLoc, Kind, BridgeKeywordLoc, TSInfo,
4487 SubExpr);
4488}