Bug Summary

File:/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp
Warning:line 2460, column 7
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -triple x86_64-apple-macosx10.14.0 -Wdeprecated-objc-isa-usage -Werror=deprecated-objc-isa-usage -analyze -disable-free -main-file-name SemaExprObjC.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=osx -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -mrelocation-model pic -pic-level 2 -mthread-model posix -mdisable-fp-elim -masm-verbose -munwind-tables -target-cpu penryn -dwarf-column-info -debugger-tuning=lldb -ggnu-pubnames -target-linker-version 450.3 -resource-dir /Users/adergachev/svn/release-c++17/lib/clang/9.0.0 -D GTEST_HAS_RTTI=0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I tools/clang/lib/Sema -I /Users/adergachev/svn/llvm/tools/clang/lib/Sema -I /Users/adergachev/svn/llvm/tools/clang/include -I tools/clang/include -I /usr/include/libxml2 -I include -I /Users/adergachev/svn/llvm/include -U NDEBUG -stdlib=libc++ -internal-isystem /Users/adergachev/svn/release-c++17/bin/../include/c++/v1 -O3 -Wno-unused-parameter -Wno-long-long -Wno-noexcept-type -Wno-nested-anon-types -pedantic -std=c++1z -fdeprecated-macro -fdebug-compilation-dir /Users/adergachev/svn/release-c++17 -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -stack-protector 1 -fblocks -fencode-extended-block-signature -fno-rtti -fregister-global-dtors-with-atexit -fobjc-runtime=macosx-10.14.0 -fmax-type-align=16 -fno-common -fdiagnostics-show-option -fcolor-diagnostics -vectorize-loops -vectorize-slp -analyzer-output=html -o /Users/adergachev/reports/scan-build-2019-03-20-18-43-26-302777-xKOEgD -x c++ /Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp
1//===--- SemaExprObjC.cpp - Semantic Analysis for ObjC Expressions --------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements semantic analysis for Objective-C expressions.
10//
11//===----------------------------------------------------------------------===//
12
13#include "clang/Sema/SemaInternal.h"
14#include "clang/AST/ASTContext.h"
15#include "clang/AST/DeclObjC.h"
16#include "clang/AST/ExprObjC.h"
17#include "clang/AST/StmtVisitor.h"
18#include "clang/AST/TypeLoc.h"
19#include "clang/Analysis/DomainSpecific/CocoaConventions.h"
20#include "clang/Edit/Commit.h"
21#include "clang/Edit/Rewriters.h"
22#include "clang/Lex/Preprocessor.h"
23#include "clang/Sema/Initialization.h"
24#include "clang/Sema/Lookup.h"
25#include "clang/Sema/Scope.h"
26#include "clang/Sema/ScopeInfo.h"
27#include "llvm/ADT/SmallString.h"
28#include "llvm/Support/ConvertUTF.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->getBeginLoc(), diag::err_cfstring_literal_not_string_constant)
54 << S->getSourceRange();
55 return true;
56 }
57
58 // Append the string.
59 StrBuf += S->getString();
60
61 // Get the locations of the string tokens.
62 StrLocs.append(S->tokloc_begin(), S->tokloc_end());
63 }
64
65 // Create the aggregate string with the appropriate content and location
66 // information.
67 const ConstantArrayType *CAT = Context.getAsConstantArrayType(S->getType());
68 assert(CAT && "String literal not of constant array type!")(__builtin_expect(!(CAT && "String literal not of constant array type!"
), 0) ? __assert_rtn(__func__, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 68, "CAT && \"String literal not of constant array type!\""
) : (void)0)
;
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->getBeginLoc(), diag::err_no_nsconstant_string_class)
111 << NSIdent << S->getSourceRange();
112 Ty = Context.getObjCIdType();
113 }
114 } else {
115 IdentifierInfo *NSIdent = NSAPIObj->getNSClassId(NSAPI::ClassId_NSString);
116 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc,
117 LookupOrdinaryName);
118 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
119 Context.setObjCConstantStringInterface(StrIF);
120 Ty = Context.getObjCConstantStringInterface();
121 Ty = Context.getObjCObjectPointerType(Ty);
122 } else {
123 // If there is no NSString interface defined, implicitly declare
124 // a @class NSString; and use that instead. This is to make sure
125 // type of an NSString literal is represented correctly, instead of
126 // being an 'id' type.
127 Ty = Context.getObjCNSStringType();
128 if (Ty.isNull()) {
129 ObjCInterfaceDecl *NSStringIDecl =
130 ObjCInterfaceDecl::Create (Context,
131 Context.getTranslationUnitDecl(),
132 SourceLocation(), NSIdent,
133 nullptr, nullptr, SourceLocation());
134 Ty = Context.getObjCInterfaceType(NSStringIDecl);
135 Context.setObjCNSStringType(Ty);
136 }
137 Ty = Context.getObjCObjectPointerType(Ty);
138 }
139 }
140
141 return new (Context) ObjCStringLiteral(S, Ty, AtLoc);
142}
143
144/// Emits an error if the given method does not exist, or if the return
145/// type is not an Objective-C object.
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/// 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"
, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 189)
;
190}
191
192/// 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/// 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/// 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/// 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 = InitializationKind::CreateCopy(
403 Element->getBeginLoc(), SourceLocation());
404 InitializationSequence Seq(S, Entity, Kind, Element);
405 if (!Seq.Failed())
406 return Seq.Perform(S, Entity, Kind, Element);
407 }
408
409 Expr *OrigElement = Element;
410
411 // Perform lvalue-to-rvalue conversion.
412 Result = S.DefaultLvalueConversion(Element);
413 if (Result.isInvalid())
414 return ExprError();
415 Element = Result.get();
416
417 // Make sure that we have an Objective-C pointer type or block.
418 if (!Element->getType()->isObjCObjectPointerType() &&
419 !Element->getType()->isBlockPointerType()) {
420 bool Recovered = false;
421
422 // If this is potentially an Objective-C numeric literal, add the '@'.
423 if (isa<IntegerLiteral>(OrigElement) ||
424 isa<CharacterLiteral>(OrigElement) ||
425 isa<FloatingLiteral>(OrigElement) ||
426 isa<ObjCBoolLiteralExpr>(OrigElement) ||
427 isa<CXXBoolLiteralExpr>(OrigElement)) {
428 if (S.NSAPIObj->getNSNumberFactoryMethodKind(OrigElement->getType())) {
429 int Which = isa<CharacterLiteral>(OrigElement) ? 1
430 : (isa<CXXBoolLiteralExpr>(OrigElement) ||
431 isa<ObjCBoolLiteralExpr>(OrigElement)) ? 2
432 : 3;
433
434 S.Diag(OrigElement->getBeginLoc(), diag::err_box_literal_collection)
435 << Which << OrigElement->getSourceRange()
436 << FixItHint::CreateInsertion(OrigElement->getBeginLoc(), "@");
437
438 Result =
439 S.BuildObjCNumericLiteral(OrigElement->getBeginLoc(), OrigElement);
440 if (Result.isInvalid())
441 return ExprError();
442
443 Element = Result.get();
444 Recovered = true;
445 }
446 }
447 // If this is potentially an Objective-C string literal, add the '@'.
448 else if (StringLiteral *String = dyn_cast<StringLiteral>(OrigElement)) {
449 if (String->isAscii()) {
450 S.Diag(OrigElement->getBeginLoc(), diag::err_box_literal_collection)
451 << 0 << OrigElement->getSourceRange()
452 << FixItHint::CreateInsertion(OrigElement->getBeginLoc(), "@");
453
454 Result = S.BuildObjCStringLiteral(OrigElement->getBeginLoc(), String);
455 if (Result.isInvalid())
456 return ExprError();
457
458 Element = Result.get();
459 Recovered = true;
460 }
461 }
462
463 if (!Recovered) {
464 S.Diag(Element->getBeginLoc(), diag::err_invalid_collection_element)
465 << Element->getType();
466 return ExprError();
467 }
468 }
469 if (ArrayLiteral)
470 if (ObjCStringLiteral *getString =
471 dyn_cast<ObjCStringLiteral>(OrigElement)) {
472 if (StringLiteral *SL = getString->getString()) {
473 unsigned numConcat = SL->getNumConcatenated();
474 if (numConcat > 1) {
475 // Only warn if the concatenated string doesn't come from a macro.
476 bool hasMacro = false;
477 for (unsigned i = 0; i < numConcat ; ++i)
478 if (SL->getStrTokenLoc(i).isMacroID()) {
479 hasMacro = true;
480 break;
481 }
482 if (!hasMacro)
483 S.Diag(Element->getBeginLoc(),
484 diag::warn_concatenated_nsarray_literal)
485 << Element->getType();
486 }
487 }
488 }
489
490 // Make sure that the element has the type that the container factory
491 // function expects.
492 return S.PerformCopyInitialization(
493 InitializedEntity::InitializeParameter(S.Context, T,
494 /*Consumed=*/false),
495 Element->getBeginLoc(), Element);
496}
497
498ExprResult Sema::BuildObjCBoxedExpr(SourceRange SR, Expr *ValueExpr) {
499 if (ValueExpr->isTypeDependent()) {
500 ObjCBoxedExpr *BoxedExpr =
501 new (Context) ObjCBoxedExpr(ValueExpr, Context.DependentTy, nullptr, SR);
502 return BoxedExpr;
503 }
504 ObjCMethodDecl *BoxingMethod = nullptr;
505 QualType BoxedType;
506 // Convert the expression to an RValue, so we can check for pointer types...
507 ExprResult RValue = DefaultFunctionArrayLvalueConversion(ValueExpr);
508 if (RValue.isInvalid()) {
509 return ExprError();
510 }
511 SourceLocation Loc = SR.getBegin();
512 ValueExpr = RValue.get();
513 QualType ValueType(ValueExpr->getType());
514 if (const PointerType *PT = ValueType->getAs<PointerType>()) {
515 QualType PointeeType = PT->getPointeeType();
516 if (Context.hasSameUnqualifiedType(PointeeType, Context.CharTy)) {
517
518 if (!NSStringDecl) {
519 NSStringDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
520 Sema::LK_String);
521 if (!NSStringDecl) {
522 return ExprError();
523 }
524 QualType NSStringObject = Context.getObjCInterfaceType(NSStringDecl);
525 NSStringPointer = Context.getObjCObjectPointerType(NSStringObject);
526 }
527
528 // The boxed expression can be emitted as a compile time constant if it is
529 // a string literal whose character encoding is compatible with UTF-8.
530 if (auto *CE = dyn_cast<ImplicitCastExpr>(ValueExpr))
531 if (CE->getCastKind() == CK_ArrayToPointerDecay)
532 if (auto *SL =
533 dyn_cast<StringLiteral>(CE->getSubExpr()->IgnoreParens())) {
534 assert((SL->isAscii() || SL->isUTF8()) &&(__builtin_expect(!((SL->isAscii() || SL->isUTF8()) &&
"unexpected character encoding"), 0) ? __assert_rtn(__func__
, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 535, "(SL->isAscii() || SL->isUTF8()) && \"unexpected character encoding\""
) : (void)0)
535 "unexpected character encoding")(__builtin_expect(!((SL->isAscii() || SL->isUTF8()) &&
"unexpected character encoding"), 0) ? __assert_rtn(__func__
, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 535, "(SL->isAscii() || SL->isUTF8()) && \"unexpected character encoding\""
) : (void)0)
;
536 StringRef Str = SL->getString();
537 const llvm::UTF8 *StrBegin = Str.bytes_begin();
538 const llvm::UTF8 *StrEnd = Str.bytes_end();
539 // Check that this is a valid UTF-8 string.
540 if (llvm::isLegalUTF8String(&StrBegin, StrEnd)) {
541 BoxedType = Context.getAttributedType(
542 AttributedType::getNullabilityAttrKind(
543 NullabilityKind::NonNull),
544 NSStringPointer, NSStringPointer);
545 return new (Context) ObjCBoxedExpr(CE, BoxedType, nullptr, SR);
546 }
547
548 Diag(SL->getBeginLoc(), diag::warn_objc_boxing_invalid_utf8_string)
549 << NSStringPointer << SL->getSourceRange();
550 }
551
552 if (!StringWithUTF8StringMethod) {
553 IdentifierInfo *II = &Context.Idents.get("stringWithUTF8String");
554 Selector stringWithUTF8String = Context.Selectors.getUnarySelector(II);
555
556 // Look for the appropriate method within NSString.
557 BoxingMethod = NSStringDecl->lookupClassMethod(stringWithUTF8String);
558 if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) {
559 // Debugger needs to work even if NSString hasn't been defined.
560 TypeSourceInfo *ReturnTInfo = nullptr;
561 ObjCMethodDecl *M = ObjCMethodDecl::Create(
562 Context, SourceLocation(), SourceLocation(), stringWithUTF8String,
563 NSStringPointer, ReturnTInfo, NSStringDecl,
564 /*isInstance=*/false, /*isVariadic=*/false,
565 /*isPropertyAccessor=*/false,
566 /*isImplicitlyDeclared=*/true,
567 /*isDefined=*/false, ObjCMethodDecl::Required,
568 /*HasRelatedResultType=*/false);
569 QualType ConstCharType = Context.CharTy.withConst();
570 ParmVarDecl *value =
571 ParmVarDecl::Create(Context, M,
572 SourceLocation(), SourceLocation(),
573 &Context.Idents.get("value"),
574 Context.getPointerType(ConstCharType),
575 /*TInfo=*/nullptr,
576 SC_None, nullptr);
577 M->setMethodParams(Context, value, None);
578 BoxingMethod = M;
579 }
580
581 if (!validateBoxingMethod(*this, Loc, NSStringDecl,
582 stringWithUTF8String, BoxingMethod))
583 return ExprError();
584
585 StringWithUTF8StringMethod = BoxingMethod;
586 }
587
588 BoxingMethod = StringWithUTF8StringMethod;
589 BoxedType = NSStringPointer;
590 // Transfer the nullability from method's return type.
591 Optional<NullabilityKind> Nullability =
592 BoxingMethod->getReturnType()->getNullability(Context);
593 if (Nullability)
594 BoxedType = Context.getAttributedType(
595 AttributedType::getNullabilityAttrKind(*Nullability), BoxedType,
596 BoxedType);
597 }
598 } else if (ValueType->isBuiltinType()) {
599 // The other types we support are numeric, char and BOOL/bool. We could also
600 // provide limited support for structure types, such as NSRange, NSRect, and
601 // NSSize. See NSValue (NSValueGeometryExtensions) in <Foundation/NSGeometry.h>
602 // for more details.
603
604 // Check for a top-level character literal.
605 if (const CharacterLiteral *Char =
606 dyn_cast<CharacterLiteral>(ValueExpr->IgnoreParens())) {
607 // In C, character literals have type 'int'. That's not the type we want
608 // to use to determine the Objective-c literal kind.
609 switch (Char->getKind()) {
610 case CharacterLiteral::Ascii:
611 case CharacterLiteral::UTF8:
612 ValueType = Context.CharTy;
613 break;
614
615 case CharacterLiteral::Wide:
616 ValueType = Context.getWideCharType();
617 break;
618
619 case CharacterLiteral::UTF16:
620 ValueType = Context.Char16Ty;
621 break;
622
623 case CharacterLiteral::UTF32:
624 ValueType = Context.Char32Ty;
625 break;
626 }
627 }
628 // FIXME: Do I need to do anything special with BoolTy expressions?
629
630 // Look for the appropriate method within NSNumber.
631 BoxingMethod = getNSNumberFactoryMethod(*this, Loc, ValueType);
632 BoxedType = NSNumberPointer;
633 } else if (const EnumType *ET = ValueType->getAs<EnumType>()) {
634 if (!ET->getDecl()->isComplete()) {
635 Diag(Loc, diag::err_objc_incomplete_boxed_expression_type)
636 << ValueType << ValueExpr->getSourceRange();
637 return ExprError();
638 }
639
640 BoxingMethod = getNSNumberFactoryMethod(*this, Loc,
641 ET->getDecl()->getIntegerType());
642 BoxedType = NSNumberPointer;
643 } else if (ValueType->isObjCBoxableRecordType()) {
644 // Support for structure types, that marked as objc_boxable
645 // struct __attribute__((objc_boxable)) s { ... };
646
647 // Look up the NSValue class, if we haven't done so already. It's cached
648 // in the Sema instance.
649 if (!NSValueDecl) {
650 NSValueDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
651 Sema::LK_Boxed);
652 if (!NSValueDecl) {
653 return ExprError();
654 }
655
656 // generate the pointer to NSValue type.
657 QualType NSValueObject = Context.getObjCInterfaceType(NSValueDecl);
658 NSValuePointer = Context.getObjCObjectPointerType(NSValueObject);
659 }
660
661 if (!ValueWithBytesObjCTypeMethod) {
662 IdentifierInfo *II[] = {
663 &Context.Idents.get("valueWithBytes"),
664 &Context.Idents.get("objCType")
665 };
666 Selector ValueWithBytesObjCType = Context.Selectors.getSelector(2, II);
667
668 // Look for the appropriate method within NSValue.
669 BoxingMethod = NSValueDecl->lookupClassMethod(ValueWithBytesObjCType);
670 if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) {
671 // Debugger needs to work even if NSValue hasn't been defined.
672 TypeSourceInfo *ReturnTInfo = nullptr;
673 ObjCMethodDecl *M = ObjCMethodDecl::Create(
674 Context,
675 SourceLocation(),
676 SourceLocation(),
677 ValueWithBytesObjCType,
678 NSValuePointer,
679 ReturnTInfo,
680 NSValueDecl,
681 /*isInstance=*/false,
682 /*isVariadic=*/false,
683 /*isPropertyAccessor=*/false,
684 /*isImplicitlyDeclared=*/true,
685 /*isDefined=*/false,
686 ObjCMethodDecl::Required,
687 /*HasRelatedResultType=*/false);
688
689 SmallVector<ParmVarDecl *, 2> Params;
690
691 ParmVarDecl *bytes =
692 ParmVarDecl::Create(Context, M,
693 SourceLocation(), SourceLocation(),
694 &Context.Idents.get("bytes"),
695 Context.VoidPtrTy.withConst(),
696 /*TInfo=*/nullptr,
697 SC_None, nullptr);
698 Params.push_back(bytes);
699
700 QualType ConstCharType = Context.CharTy.withConst();
701 ParmVarDecl *type =
702 ParmVarDecl::Create(Context, M,
703 SourceLocation(), SourceLocation(),
704 &Context.Idents.get("type"),
705 Context.getPointerType(ConstCharType),
706 /*TInfo=*/nullptr,
707 SC_None, nullptr);
708 Params.push_back(type);
709
710 M->setMethodParams(Context, Params, None);
711 BoxingMethod = M;
712 }
713
714 if (!validateBoxingMethod(*this, Loc, NSValueDecl,
715 ValueWithBytesObjCType, BoxingMethod))
716 return ExprError();
717
718 ValueWithBytesObjCTypeMethod = BoxingMethod;
719 }
720
721 if (!ValueType.isTriviallyCopyableType(Context)) {
722 Diag(Loc, diag::err_objc_non_trivially_copyable_boxed_expression_type)
723 << ValueType << ValueExpr->getSourceRange();
724 return ExprError();
725 }
726
727 BoxingMethod = ValueWithBytesObjCTypeMethod;
728 BoxedType = NSValuePointer;
729 }
730
731 if (!BoxingMethod) {
732 Diag(Loc, diag::err_objc_illegal_boxed_expression_type)
733 << ValueType << ValueExpr->getSourceRange();
734 return ExprError();
735 }
736
737 DiagnoseUseOfDecl(BoxingMethod, Loc);
738
739 ExprResult ConvertedValueExpr;
740 if (ValueType->isObjCBoxableRecordType()) {
741 InitializedEntity IE = InitializedEntity::InitializeTemporary(ValueType);
742 ConvertedValueExpr = PerformCopyInitialization(IE, ValueExpr->getExprLoc(),
743 ValueExpr);
744 } else {
745 // Convert the expression to the type that the parameter requires.
746 ParmVarDecl *ParamDecl = BoxingMethod->parameters()[0];
747 InitializedEntity IE = InitializedEntity::InitializeParameter(Context,
748 ParamDecl);
749 ConvertedValueExpr = PerformCopyInitialization(IE, SourceLocation(),
750 ValueExpr);
751 }
752
753 if (ConvertedValueExpr.isInvalid())
754 return ExprError();
755 ValueExpr = ConvertedValueExpr.get();
756
757 ObjCBoxedExpr *BoxedExpr =
758 new (Context) ObjCBoxedExpr(ValueExpr, BoxedType,
759 BoxingMethod, SR);
760 return MaybeBindToTemporary(BoxedExpr);
761}
762
763/// Build an ObjC subscript pseudo-object expression, given that
764/// that's supported by the runtime.
765ExprResult Sema::BuildObjCSubscriptExpression(SourceLocation RB, Expr *BaseExpr,
766 Expr *IndexExpr,
767 ObjCMethodDecl *getterMethod,
768 ObjCMethodDecl *setterMethod) {
769 assert(!LangOpts.isSubscriptPointerArithmetic())(__builtin_expect(!(!LangOpts.isSubscriptPointerArithmetic())
, 0) ? __assert_rtn(__func__, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 769, "!LangOpts.isSubscriptPointerArithmetic()") : (void)0)
;
770
771 // We can't get dependent types here; our callers should have
772 // filtered them out.
773 assert((!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) &&(__builtin_expect(!((!BaseExpr->isTypeDependent() &&
!IndexExpr->isTypeDependent()) && "base or index cannot have dependent type here"
), 0) ? __assert_rtn(__func__, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 774, "(!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) && \"base or index cannot have dependent type here\""
) : (void)0)
774 "base or index cannot have dependent type here")(__builtin_expect(!((!BaseExpr->isTypeDependent() &&
!IndexExpr->isTypeDependent()) && "base or index cannot have dependent type here"
), 0) ? __assert_rtn(__func__, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 774, "(!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) && \"base or index cannot have dependent type here\""
) : (void)0)
;
775
776 // Filter out placeholders in the index. In theory, overloads could
777 // be preserved here, although that might not actually work correctly.
778 ExprResult Result = CheckPlaceholderExpr(IndexExpr);
779 if (Result.isInvalid())
780 return ExprError();
781 IndexExpr = Result.get();
782
783 // Perform lvalue-to-rvalue conversion on the base.
784 Result = DefaultLvalueConversion(BaseExpr);
785 if (Result.isInvalid())
786 return ExprError();
787 BaseExpr = Result.get();
788
789 // Build the pseudo-object expression.
790 return new (Context) ObjCSubscriptRefExpr(
791 BaseExpr, IndexExpr, Context.PseudoObjectTy, VK_LValue, OK_ObjCSubscript,
792 getterMethod, setterMethod, RB);
793}
794
795ExprResult Sema::BuildObjCArrayLiteral(SourceRange SR, MultiExprArg Elements) {
796 SourceLocation Loc = SR.getBegin();
797
798 if (!NSArrayDecl) {
799 NSArrayDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
800 Sema::LK_Array);
801 if (!NSArrayDecl) {
802 return ExprError();
803 }
804 }
805
806 // Find the arrayWithObjects:count: method, if we haven't done so already.
807 QualType IdT = Context.getObjCIdType();
808 if (!ArrayWithObjectsMethod) {
809 Selector
810 Sel = NSAPIObj->getNSArraySelector(NSAPI::NSArr_arrayWithObjectsCount);
811 ObjCMethodDecl *Method = NSArrayDecl->lookupClassMethod(Sel);
812 if (!Method && getLangOpts().DebuggerObjCLiteral) {
813 TypeSourceInfo *ReturnTInfo = nullptr;
814 Method = ObjCMethodDecl::Create(
815 Context, SourceLocation(), SourceLocation(), Sel, IdT, ReturnTInfo,
816 Context.getTranslationUnitDecl(), false /*Instance*/,
817 false /*isVariadic*/,
818 /*isPropertyAccessor=*/false,
819 /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
820 ObjCMethodDecl::Required, false);
821 SmallVector<ParmVarDecl *, 2> Params;
822 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
823 SourceLocation(),
824 SourceLocation(),
825 &Context.Idents.get("objects"),
826 Context.getPointerType(IdT),
827 /*TInfo=*/nullptr,
828 SC_None, nullptr);
829 Params.push_back(objects);
830 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
831 SourceLocation(),
832 SourceLocation(),
833 &Context.Idents.get("cnt"),
834 Context.UnsignedLongTy,
835 /*TInfo=*/nullptr, SC_None,
836 nullptr);
837 Params.push_back(cnt);
838 Method->setMethodParams(Context, Params, None);
839 }
840
841 if (!validateBoxingMethod(*this, Loc, NSArrayDecl, Sel, Method))
842 return ExprError();
843
844 // Dig out the type that all elements should be converted to.
845 QualType T = Method->parameters()[0]->getType();
846 const PointerType *PtrT = T->getAs<PointerType>();
847 if (!PtrT ||
848 !Context.hasSameUnqualifiedType(PtrT->getPointeeType(), IdT)) {
849 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
850 << Sel;
851 Diag(Method->parameters()[0]->getLocation(),
852 diag::note_objc_literal_method_param)
853 << 0 << T
854 << Context.getPointerType(IdT.withConst());
855 return ExprError();
856 }
857
858 // Check that the 'count' parameter is integral.
859 if (!Method->parameters()[1]->getType()->isIntegerType()) {
860 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
861 << Sel;
862 Diag(Method->parameters()[1]->getLocation(),
863 diag::note_objc_literal_method_param)
864 << 1
865 << Method->parameters()[1]->getType()
866 << "integral";
867 return ExprError();
868 }
869
870 // We've found a good +arrayWithObjects:count: method. Save it!
871 ArrayWithObjectsMethod = Method;
872 }
873
874 QualType ObjectsType = ArrayWithObjectsMethod->parameters()[0]->getType();
875 QualType RequiredType = ObjectsType->castAs<PointerType>()->getPointeeType();
876
877 // Check that each of the elements provided is valid in a collection literal,
878 // performing conversions as necessary.
879 Expr **ElementsBuffer = Elements.data();
880 for (unsigned I = 0, N = Elements.size(); I != N; ++I) {
881 ExprResult Converted = CheckObjCCollectionLiteralElement(*this,
882 ElementsBuffer[I],
883 RequiredType, true);
884 if (Converted.isInvalid())
885 return ExprError();
886
887 ElementsBuffer[I] = Converted.get();
888 }
889
890 QualType Ty
891 = Context.getObjCObjectPointerType(
892 Context.getObjCInterfaceType(NSArrayDecl));
893
894 return MaybeBindToTemporary(
895 ObjCArrayLiteral::Create(Context, Elements, Ty,
896 ArrayWithObjectsMethod, SR));
897}
898
899ExprResult Sema::BuildObjCDictionaryLiteral(SourceRange SR,
900 MutableArrayRef<ObjCDictionaryElement> Elements) {
901 SourceLocation Loc = SR.getBegin();
902
903 if (!NSDictionaryDecl) {
904 NSDictionaryDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
905 Sema::LK_Dictionary);
906 if (!NSDictionaryDecl) {
907 return ExprError();
908 }
909 }
910
911 // Find the dictionaryWithObjects:forKeys:count: method, if we haven't done
912 // so already.
913 QualType IdT = Context.getObjCIdType();
914 if (!DictionaryWithObjectsMethod) {
915 Selector Sel = NSAPIObj->getNSDictionarySelector(
916 NSAPI::NSDict_dictionaryWithObjectsForKeysCount);
917 ObjCMethodDecl *Method = NSDictionaryDecl->lookupClassMethod(Sel);
918 if (!Method && getLangOpts().DebuggerObjCLiteral) {
919 Method = ObjCMethodDecl::Create(Context,
920 SourceLocation(), SourceLocation(), Sel,
921 IdT,
922 nullptr /*TypeSourceInfo */,
923 Context.getTranslationUnitDecl(),
924 false /*Instance*/, false/*isVariadic*/,
925 /*isPropertyAccessor=*/false,
926 /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
927 ObjCMethodDecl::Required,
928 false);
929 SmallVector<ParmVarDecl *, 3> Params;
930 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
931 SourceLocation(),
932 SourceLocation(),
933 &Context.Idents.get("objects"),
934 Context.getPointerType(IdT),
935 /*TInfo=*/nullptr, SC_None,
936 nullptr);
937 Params.push_back(objects);
938 ParmVarDecl *keys = ParmVarDecl::Create(Context, Method,
939 SourceLocation(),
940 SourceLocation(),
941 &Context.Idents.get("keys"),
942 Context.getPointerType(IdT),
943 /*TInfo=*/nullptr, SC_None,
944 nullptr);
945 Params.push_back(keys);
946 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
947 SourceLocation(),
948 SourceLocation(),
949 &Context.Idents.get("cnt"),
950 Context.UnsignedLongTy,
951 /*TInfo=*/nullptr, SC_None,
952 nullptr);
953 Params.push_back(cnt);
954 Method->setMethodParams(Context, Params, None);
955 }
956
957 if (!validateBoxingMethod(*this, SR.getBegin(), NSDictionaryDecl, Sel,
958 Method))
959 return ExprError();
960
961 // Dig out the type that all values should be converted to.
962 QualType ValueT = Method->parameters()[0]->getType();
963 const PointerType *PtrValue = ValueT->getAs<PointerType>();
964 if (!PtrValue ||
965 !Context.hasSameUnqualifiedType(PtrValue->getPointeeType(), IdT)) {
966 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
967 << Sel;
968 Diag(Method->parameters()[0]->getLocation(),
969 diag::note_objc_literal_method_param)
970 << 0 << ValueT
971 << Context.getPointerType(IdT.withConst());
972 return ExprError();
973 }
974
975 // Dig out the type that all keys should be converted to.
976 QualType KeyT = Method->parameters()[1]->getType();
977 const PointerType *PtrKey = KeyT->getAs<PointerType>();
978 if (!PtrKey ||
979 !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
980 IdT)) {
981 bool err = true;
982 if (PtrKey) {
983 if (QIDNSCopying.isNull()) {
984 // key argument of selector is id<NSCopying>?
985 if (ObjCProtocolDecl *NSCopyingPDecl =
986 LookupProtocol(&Context.Idents.get("NSCopying"), SR.getBegin())) {
987 ObjCProtocolDecl *PQ[] = {NSCopyingPDecl};
988 QIDNSCopying =
989 Context.getObjCObjectType(Context.ObjCBuiltinIdTy, { },
990 llvm::makeArrayRef(
991 (ObjCProtocolDecl**) PQ,
992 1),
993 false);
994 QIDNSCopying = Context.getObjCObjectPointerType(QIDNSCopying);
995 }
996 }
997 if (!QIDNSCopying.isNull())
998 err = !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
999 QIDNSCopying);
1000 }
1001
1002 if (err) {
1003 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
1004 << Sel;
1005 Diag(Method->parameters()[1]->getLocation(),
1006 diag::note_objc_literal_method_param)
1007 << 1 << KeyT
1008 << Context.getPointerType(IdT.withConst());
1009 return ExprError();
1010 }
1011 }
1012
1013 // Check that the 'count' parameter is integral.
1014 QualType CountType = Method->parameters()[2]->getType();
1015 if (!CountType->isIntegerType()) {
1016 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
1017 << Sel;
1018 Diag(Method->parameters()[2]->getLocation(),
1019 diag::note_objc_literal_method_param)
1020 << 2 << CountType
1021 << "integral";
1022 return ExprError();
1023 }
1024
1025 // We've found a good +dictionaryWithObjects:keys:count: method; save it!
1026 DictionaryWithObjectsMethod = Method;
1027 }
1028
1029 QualType ValuesT = DictionaryWithObjectsMethod->parameters()[0]->getType();
1030 QualType ValueT = ValuesT->castAs<PointerType>()->getPointeeType();
1031 QualType KeysT = DictionaryWithObjectsMethod->parameters()[1]->getType();
1032 QualType KeyT = KeysT->castAs<PointerType>()->getPointeeType();
1033
1034 // Check that each of the keys and values provided is valid in a collection
1035 // literal, performing conversions as necessary.
1036 bool HasPackExpansions = false;
1037 for (ObjCDictionaryElement &Element : Elements) {
1038 // Check the key.
1039 ExprResult Key = CheckObjCCollectionLiteralElement(*this, Element.Key,
1040 KeyT);
1041 if (Key.isInvalid())
1042 return ExprError();
1043
1044 // Check the value.
1045 ExprResult Value
1046 = CheckObjCCollectionLiteralElement(*this, Element.Value, ValueT);
1047 if (Value.isInvalid())
1048 return ExprError();
1049
1050 Element.Key = Key.get();
1051 Element.Value = Value.get();
1052
1053 if (Element.EllipsisLoc.isInvalid())
1054 continue;
1055
1056 if (!Element.Key->containsUnexpandedParameterPack() &&
1057 !Element.Value->containsUnexpandedParameterPack()) {
1058 Diag(Element.EllipsisLoc,
1059 diag::err_pack_expansion_without_parameter_packs)
1060 << SourceRange(Element.Key->getBeginLoc(),
1061 Element.Value->getEndLoc());
1062 return ExprError();
1063 }
1064
1065 HasPackExpansions = true;
1066 }
1067
1068 QualType Ty
1069 = Context.getObjCObjectPointerType(
1070 Context.getObjCInterfaceType(NSDictionaryDecl));
1071 return MaybeBindToTemporary(ObjCDictionaryLiteral::Create(
1072 Context, Elements, HasPackExpansions, Ty,
1073 DictionaryWithObjectsMethod, SR));
1074}
1075
1076ExprResult Sema::BuildObjCEncodeExpression(SourceLocation AtLoc,
1077 TypeSourceInfo *EncodedTypeInfo,
1078 SourceLocation RParenLoc) {
1079 QualType EncodedType = EncodedTypeInfo->getType();
1080 QualType StrTy;
1081 if (EncodedType->isDependentType())
1082 StrTy = Context.DependentTy;
1083 else {
1084 if (!EncodedType->getAsArrayTypeUnsafe() && //// Incomplete array is handled.
1085 !EncodedType->isVoidType()) // void is handled too.
1086 if (RequireCompleteType(AtLoc, EncodedType,
1087 diag::err_incomplete_type_objc_at_encode,
1088 EncodedTypeInfo->getTypeLoc()))
1089 return ExprError();
1090
1091 std::string Str;
1092 QualType NotEncodedT;
1093 Context.getObjCEncodingForType(EncodedType, Str, nullptr, &NotEncodedT);
1094 if (!NotEncodedT.isNull())
1095 Diag(AtLoc, diag::warn_incomplete_encoded_type)
1096 << EncodedType << NotEncodedT;
1097
1098 // The type of @encode is the same as the type of the corresponding string,
1099 // which is an array type.
1100 StrTy = Context.CharTy;
1101 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
1102 if (getLangOpts().CPlusPlus || getLangOpts().ConstStrings)
1103 StrTy.addConst();
1104 StrTy = Context.getConstantArrayType(StrTy, llvm::APInt(32, Str.size()+1),
1105 ArrayType::Normal, 0);
1106 }
1107
1108 return new (Context) ObjCEncodeExpr(StrTy, EncodedTypeInfo, AtLoc, RParenLoc);
1109}
1110
1111ExprResult Sema::ParseObjCEncodeExpression(SourceLocation AtLoc,
1112 SourceLocation EncodeLoc,
1113 SourceLocation LParenLoc,
1114 ParsedType ty,
1115 SourceLocation RParenLoc) {
1116 // FIXME: Preserve type source info ?
1117 TypeSourceInfo *TInfo;
1118 QualType EncodedType = GetTypeFromParser(ty, &TInfo);
1119 if (!TInfo)
1120 TInfo = Context.getTrivialTypeSourceInfo(EncodedType,
1121 getLocForEndOfToken(LParenLoc));
1122
1123 return BuildObjCEncodeExpression(AtLoc, TInfo, RParenLoc);
1124}
1125
1126static bool HelperToDiagnoseMismatchedMethodsInGlobalPool(Sema &S,
1127 SourceLocation AtLoc,
1128 SourceLocation LParenLoc,
1129 SourceLocation RParenLoc,
1130 ObjCMethodDecl *Method,
1131 ObjCMethodList &MethList) {
1132 ObjCMethodList *M = &MethList;
1133 bool Warned = false;
1134 for (M = M->getNext(); M; M=M->getNext()) {
1135 ObjCMethodDecl *MatchingMethodDecl = M->getMethod();
1136 if (MatchingMethodDecl == Method ||
1137 isa<ObjCImplDecl>(MatchingMethodDecl->getDeclContext()) ||
1138 MatchingMethodDecl->getSelector() != Method->getSelector())
1139 continue;
1140 if (!S.MatchTwoMethodDeclarations(Method,
1141 MatchingMethodDecl, Sema::MMS_loose)) {
1142 if (!Warned) {
1143 Warned = true;
1144 S.Diag(AtLoc, diag::warn_multiple_selectors)
1145 << Method->getSelector() << FixItHint::CreateInsertion(LParenLoc, "(")
1146 << FixItHint::CreateInsertion(RParenLoc, ")");
1147 S.Diag(Method->getLocation(), diag::note_method_declared_at)
1148 << Method->getDeclName();
1149 }
1150 S.Diag(MatchingMethodDecl->getLocation(), diag::note_method_declared_at)
1151 << MatchingMethodDecl->getDeclName();
1152 }
1153 }
1154 return Warned;
1155}
1156
1157static void DiagnoseMismatchedSelectors(Sema &S, SourceLocation AtLoc,
1158 ObjCMethodDecl *Method,
1159 SourceLocation LParenLoc,
1160 SourceLocation RParenLoc,
1161 bool WarnMultipleSelectors) {
1162 if (!WarnMultipleSelectors ||
1163 S.Diags.isIgnored(diag::warn_multiple_selectors, SourceLocation()))
1164 return;
1165 bool Warned = false;
1166 for (Sema::GlobalMethodPool::iterator b = S.MethodPool.begin(),
1167 e = S.MethodPool.end(); b != e; b++) {
1168 // first, instance methods
1169 ObjCMethodList &InstMethList = b->second.first;
1170 if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc,
1171 Method, InstMethList))
1172 Warned = true;
1173
1174 // second, class methods
1175 ObjCMethodList &ClsMethList = b->second.second;
1176 if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc,
1177 Method, ClsMethList) || Warned)
1178 return;
1179 }
1180}
1181
1182ExprResult Sema::ParseObjCSelectorExpression(Selector Sel,
1183 SourceLocation AtLoc,
1184 SourceLocation SelLoc,
1185 SourceLocation LParenLoc,
1186 SourceLocation RParenLoc,
1187 bool WarnMultipleSelectors) {
1188 ObjCMethodDecl *Method = LookupInstanceMethodInGlobalPool(Sel,
1189 SourceRange(LParenLoc, RParenLoc));
1190 if (!Method)
1191 Method = LookupFactoryMethodInGlobalPool(Sel,
1192 SourceRange(LParenLoc, RParenLoc));
1193 if (!Method) {
1194 if (const ObjCMethodDecl *OM = SelectorsForTypoCorrection(Sel)) {
1195 Selector MatchedSel = OM->getSelector();
1196 SourceRange SelectorRange(LParenLoc.getLocWithOffset(1),
1197 RParenLoc.getLocWithOffset(-1));
1198 Diag(SelLoc, diag::warn_undeclared_selector_with_typo)
1199 << Sel << MatchedSel
1200 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1201
1202 } else
1203 Diag(SelLoc, diag::warn_undeclared_selector) << Sel;
1204 } else
1205 DiagnoseMismatchedSelectors(*this, AtLoc, Method, LParenLoc, RParenLoc,
1206 WarnMultipleSelectors);
1207
1208 if (Method &&
1209 Method->getImplementationControl() != ObjCMethodDecl::Optional &&
1210 !getSourceManager().isInSystemHeader(Method->getLocation()))
1211 ReferencedSelectors.insert(std::make_pair(Sel, AtLoc));
1212
1213 // In ARC, forbid the user from using @selector for
1214 // retain/release/autorelease/dealloc/retainCount.
1215 if (getLangOpts().ObjCAutoRefCount) {
1216 switch (Sel.getMethodFamily()) {
1217 case OMF_retain:
1218 case OMF_release:
1219 case OMF_autorelease:
1220 case OMF_retainCount:
1221 case OMF_dealloc:
1222 Diag(AtLoc, diag::err_arc_illegal_selector) <<
1223 Sel << SourceRange(LParenLoc, RParenLoc);
1224 break;
1225
1226 case OMF_None:
1227 case OMF_alloc:
1228 case OMF_copy:
1229 case OMF_finalize:
1230 case OMF_init:
1231 case OMF_mutableCopy:
1232 case OMF_new:
1233 case OMF_self:
1234 case OMF_initialize:
1235 case OMF_performSelector:
1236 break;
1237 }
1238 }
1239 QualType Ty = Context.getObjCSelType();
1240 return new (Context) ObjCSelectorExpr(Ty, Sel, AtLoc, RParenLoc);
1241}
1242
1243ExprResult Sema::ParseObjCProtocolExpression(IdentifierInfo *ProtocolId,
1244 SourceLocation AtLoc,
1245 SourceLocation ProtoLoc,
1246 SourceLocation LParenLoc,
1247 SourceLocation ProtoIdLoc,
1248 SourceLocation RParenLoc) {
1249 ObjCProtocolDecl* PDecl = LookupProtocol(ProtocolId, ProtoIdLoc);
1250 if (!PDecl) {
1251 Diag(ProtoLoc, diag::err_undeclared_protocol) << ProtocolId;
1252 return true;
1253 }
1254 if (!PDecl->hasDefinition()) {
1255 Diag(ProtoLoc, diag::err_atprotocol_protocol) << PDecl;
1256 Diag(PDecl->getLocation(), diag::note_entity_declared_at) << PDecl;
1257 } else {
1258 PDecl = PDecl->getDefinition();
1259 }
1260
1261 QualType Ty = Context.getObjCProtoType();
1262 if (Ty.isNull())
1263 return true;
1264 Ty = Context.getObjCObjectPointerType(Ty);
1265 return new (Context) ObjCProtocolExpr(Ty, PDecl, AtLoc, ProtoIdLoc, RParenLoc);
1266}
1267
1268/// Try to capture an implicit reference to 'self'.
1269ObjCMethodDecl *Sema::tryCaptureObjCSelf(SourceLocation Loc) {
1270 DeclContext *DC = getFunctionLevelDeclContext();
1271
1272 // If we're not in an ObjC method, error out. Note that, unlike the
1273 // C++ case, we don't require an instance method --- class methods
1274 // still have a 'self', and we really do still need to capture it!
1275 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(DC);
1276 if (!method)
1277 return nullptr;
1278
1279 tryCaptureVariable(method->getSelfDecl(), Loc);
1280
1281 return method;
1282}
1283
1284static QualType stripObjCInstanceType(ASTContext &Context, QualType T) {
1285 QualType origType = T;
1286 if (auto nullability = AttributedType::stripOuterNullability(T)) {
1287 if (T == Context.getObjCInstanceType()) {
1288 return Context.getAttributedType(
1289 AttributedType::getNullabilityAttrKind(*nullability),
1290 Context.getObjCIdType(),
1291 Context.getObjCIdType());
1292 }
1293
1294 return origType;
1295 }
1296
1297 if (T == Context.getObjCInstanceType())
1298 return Context.getObjCIdType();
1299
1300 return origType;
1301}
1302
1303/// Determine the result type of a message send based on the receiver type,
1304/// method, and the kind of message send.
1305///
1306/// This is the "base" result type, which will still need to be adjusted
1307/// to account for nullability.
1308static QualType getBaseMessageSendResultType(Sema &S,
1309 QualType ReceiverType,
1310 ObjCMethodDecl *Method,
1311 bool isClassMessage,
1312 bool isSuperMessage) {
1313 assert(Method && "Must have a method")(__builtin_expect(!(Method && "Must have a method"), 0
) ? __assert_rtn(__func__, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 1313, "Method && \"Must have a method\"") : (void)0
)
;
1314 if (!Method->hasRelatedResultType())
1315 return Method->getSendResultType(ReceiverType);
1316
1317 ASTContext &Context = S.Context;
1318
1319 // Local function that transfers the nullability of the method's
1320 // result type to the returned result.
1321 auto transferNullability = [&](QualType type) -> QualType {
1322 // If the method's result type has nullability, extract it.
1323 if (auto nullability = Method->getSendResultType(ReceiverType)
1324 ->getNullability(Context)){
1325 // Strip off any outer nullability sugar from the provided type.
1326 (void)AttributedType::stripOuterNullability(type);
1327
1328 // Form a new attributed type using the method result type's nullability.
1329 return Context.getAttributedType(
1330 AttributedType::getNullabilityAttrKind(*nullability),
1331 type,
1332 type);
1333 }
1334
1335 return type;
1336 };
1337
1338 // If a method has a related return type:
1339 // - if the method found is an instance method, but the message send
1340 // was a class message send, T is the declared return type of the method
1341 // found
1342 if (Method->isInstanceMethod() && isClassMessage)
1343 return stripObjCInstanceType(Context,
1344 Method->getSendResultType(ReceiverType));
1345
1346 // - if the receiver is super, T is a pointer to the class of the
1347 // enclosing method definition
1348 if (isSuperMessage) {
1349 if (ObjCMethodDecl *CurMethod = S.getCurMethodDecl())
1350 if (ObjCInterfaceDecl *Class = CurMethod->getClassInterface()) {
1351 return transferNullability(
1352 Context.getObjCObjectPointerType(
1353 Context.getObjCInterfaceType(Class)));
1354 }
1355 }
1356
1357 // - if the receiver is the name of a class U, T is a pointer to U
1358 if (ReceiverType->getAsObjCInterfaceType())
1359 return transferNullability(Context.getObjCObjectPointerType(ReceiverType));
1360 // - if the receiver is of type Class or qualified Class type,
1361 // T is the declared return type of the method.
1362 if (ReceiverType->isObjCClassType() ||
1363 ReceiverType->isObjCQualifiedClassType())
1364 return stripObjCInstanceType(Context,
1365 Method->getSendResultType(ReceiverType));
1366
1367 // - if the receiver is id, qualified id, Class, or qualified Class, T
1368 // is the receiver type, otherwise
1369 // - T is the type of the receiver expression.
1370 return transferNullability(ReceiverType);
1371}
1372
1373QualType Sema::getMessageSendResultType(const Expr *Receiver,
1374 QualType ReceiverType,
1375 ObjCMethodDecl *Method,
1376 bool isClassMessage,
1377 bool isSuperMessage) {
1378 // Produce the result type.
1379 QualType resultType = getBaseMessageSendResultType(*this, ReceiverType,
1380 Method,
1381 isClassMessage,
1382 isSuperMessage);
1383
1384 // If this is a class message, ignore the nullability of the receiver.
1385 if (isClassMessage) {
1386 // In a class method, class messages to 'self' that return instancetype can
1387 // be typed as the current class. We can safely do this in ARC because self
1388 // can't be reassigned, and we do it unsafely outside of ARC because in
1389 // practice people never reassign self in class methods and there's some
1390 // virtue in not being aggressively pedantic.
1391 if (Receiver && Receiver->isObjCSelfExpr()) {
1392 assert(ReceiverType->isObjCClassType() && "expected a Class self")(__builtin_expect(!(ReceiverType->isObjCClassType() &&
"expected a Class self"), 0) ? __assert_rtn(__func__, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 1392, "ReceiverType->isObjCClassType() && \"expected a Class self\""
) : (void)0)
;
1393 QualType T = Method->getSendResultType(ReceiverType);
1394 AttributedType::stripOuterNullability(T);
1395 if (T == Context.getObjCInstanceType()) {
1396 const ObjCMethodDecl *MD = cast<ObjCMethodDecl>(
1397 cast<ImplicitParamDecl>(
1398 cast<DeclRefExpr>(Receiver->IgnoreParenImpCasts())->getDecl())
1399 ->getDeclContext());
1400 assert(MD->isClassMethod() && "expected a class method")(__builtin_expect(!(MD->isClassMethod() && "expected a class method"
), 0) ? __assert_rtn(__func__, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 1400, "MD->isClassMethod() && \"expected a class method\""
) : (void)0)
;
1401 QualType NewResultType = Context.getObjCObjectPointerType(
1402 Context.getObjCInterfaceType(MD->getClassInterface()));
1403 if (auto Nullability = resultType->getNullability(Context))
1404 NewResultType = Context.getAttributedType(
1405 AttributedType::getNullabilityAttrKind(*Nullability),
1406 NewResultType, NewResultType);
1407 return NewResultType;
1408 }
1409 }
1410 return resultType;
1411 }
1412
1413 // There is nothing left to do if the result type cannot have a nullability
1414 // specifier.
1415 if (!resultType->canHaveNullability())
1416 return resultType;
1417
1418 // Map the nullability of the result into a table index.
1419 unsigned receiverNullabilityIdx = 0;
1420 if (auto nullability = ReceiverType->getNullability(Context))
1421 receiverNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1422
1423 unsigned resultNullabilityIdx = 0;
1424 if (auto nullability = resultType->getNullability(Context))
1425 resultNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1426
1427 // The table of nullability mappings, indexed by the receiver's nullability
1428 // and then the result type's nullability.
1429 static const uint8_t None = 0;
1430 static const uint8_t NonNull = 1;
1431 static const uint8_t Nullable = 2;
1432 static const uint8_t Unspecified = 3;
1433 static const uint8_t nullabilityMap[4][4] = {
1434 // None NonNull Nullable Unspecified
1435 /* None */ { None, None, Nullable, None },
1436 /* NonNull */ { None, NonNull, Nullable, Unspecified },
1437 /* Nullable */ { Nullable, Nullable, Nullable, Nullable },
1438 /* Unspecified */ { None, Unspecified, Nullable, Unspecified }
1439 };
1440
1441 unsigned newResultNullabilityIdx
1442 = nullabilityMap[receiverNullabilityIdx][resultNullabilityIdx];
1443 if (newResultNullabilityIdx == resultNullabilityIdx)
1444 return resultType;
1445
1446 // Strip off the existing nullability. This removes as little type sugar as
1447 // possible.
1448 do {
1449 if (auto attributed = dyn_cast<AttributedType>(resultType.getTypePtr())) {
1450 resultType = attributed->getModifiedType();
1451 } else {
1452 resultType = resultType.getDesugaredType(Context);
1453 }
1454 } while (resultType->getNullability(Context));
1455
1456 // Add nullability back if needed.
1457 if (newResultNullabilityIdx > 0) {
1458 auto newNullability
1459 = static_cast<NullabilityKind>(newResultNullabilityIdx-1);
1460 return Context.getAttributedType(
1461 AttributedType::getNullabilityAttrKind(newNullability),
1462 resultType, resultType);
1463 }
1464
1465 return resultType;
1466}
1467
1468/// Look for an ObjC method whose result type exactly matches the given type.
1469static const ObjCMethodDecl *
1470findExplicitInstancetypeDeclarer(const ObjCMethodDecl *MD,
1471 QualType instancetype) {
1472 if (MD->getReturnType() == instancetype)
1473 return MD;
1474
1475 // For these purposes, a method in an @implementation overrides a
1476 // declaration in the @interface.
1477 if (const ObjCImplDecl *impl =
1478 dyn_cast<ObjCImplDecl>(MD->getDeclContext())) {
1479 const ObjCContainerDecl *iface;
1480 if (const ObjCCategoryImplDecl *catImpl =
1481 dyn_cast<ObjCCategoryImplDecl>(impl)) {
1482 iface = catImpl->getCategoryDecl();
1483 } else {
1484 iface = impl->getClassInterface();
1485 }
1486
1487 const ObjCMethodDecl *ifaceMD =
1488 iface->getMethod(MD->getSelector(), MD->isInstanceMethod());
1489 if (ifaceMD) return findExplicitInstancetypeDeclarer(ifaceMD, instancetype);
1490 }
1491
1492 SmallVector<const ObjCMethodDecl *, 4> overrides;
1493 MD->getOverriddenMethods(overrides);
1494 for (unsigned i = 0, e = overrides.size(); i != e; ++i) {
1495 if (const ObjCMethodDecl *result =
1496 findExplicitInstancetypeDeclarer(overrides[i], instancetype))
1497 return result;
1498 }
1499
1500 return nullptr;
1501}
1502
1503void Sema::EmitRelatedResultTypeNoteForReturn(QualType destType) {
1504 // Only complain if we're in an ObjC method and the required return
1505 // type doesn't match the method's declared return type.
1506 ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurContext);
1507 if (!MD || !MD->hasRelatedResultType() ||
1508 Context.hasSameUnqualifiedType(destType, MD->getReturnType()))
1509 return;
1510
1511 // Look for a method overridden by this method which explicitly uses
1512 // 'instancetype'.
1513 if (const ObjCMethodDecl *overridden =
1514 findExplicitInstancetypeDeclarer(MD, Context.getObjCInstanceType())) {
1515 SourceRange range = overridden->getReturnTypeSourceRange();
1516 SourceLocation loc = range.getBegin();
1517 if (loc.isInvalid())
1518 loc = overridden->getLocation();
1519 Diag(loc, diag::note_related_result_type_explicit)
1520 << /*current method*/ 1 << range;
1521 return;
1522 }
1523
1524 // Otherwise, if we have an interesting method family, note that.
1525 // This should always trigger if the above didn't.
1526 if (ObjCMethodFamily family = MD->getMethodFamily())
1527 Diag(MD->getLocation(), diag::note_related_result_type_family)
1528 << /*current method*/ 1
1529 << family;
1530}
1531
1532void Sema::EmitRelatedResultTypeNote(const Expr *E) {
1533 E = E->IgnoreParenImpCasts();
1534 const ObjCMessageExpr *MsgSend = dyn_cast<ObjCMessageExpr>(E);
1535 if (!MsgSend)
1536 return;
1537
1538 const ObjCMethodDecl *Method = MsgSend->getMethodDecl();
1539 if (!Method)
1540 return;
1541
1542 if (!Method->hasRelatedResultType())
1543 return;
1544
1545 if (Context.hasSameUnqualifiedType(
1546 Method->getReturnType().getNonReferenceType(), MsgSend->getType()))
1547 return;
1548
1549 if (!Context.hasSameUnqualifiedType(Method->getReturnType(),
1550 Context.getObjCInstanceType()))
1551 return;
1552
1553 Diag(Method->getLocation(), diag::note_related_result_type_inferred)
1554 << Method->isInstanceMethod() << Method->getSelector()
1555 << MsgSend->getType();
1556}
1557
1558bool Sema::CheckMessageArgumentTypes(
1559 const Expr *Receiver, QualType ReceiverType, MultiExprArg Args,
1560 Selector Sel, ArrayRef<SourceLocation> SelectorLocs, ObjCMethodDecl *Method,
1561 bool isClassMessage, bool isSuperMessage, SourceLocation lbrac,
1562 SourceLocation rbrac, SourceRange RecRange, QualType &ReturnType,
1563 ExprValueKind &VK) {
1564 SourceLocation SelLoc;
1565 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
1566 SelLoc = SelectorLocs.front();
1567 else
1568 SelLoc = lbrac;
1569
1570 if (!Method) {
1571 // Apply default argument promotion as for (C99 6.5.2.2p6).
1572 for (unsigned i = 0, e = Args.size(); i != e; i++) {
1573 if (Args[i]->isTypeDependent())
1574 continue;
1575
1576 ExprResult result;
1577 if (getLangOpts().DebuggerSupport) {
1578 QualType paramTy; // ignored
1579 result = checkUnknownAnyArg(SelLoc, Args[i], paramTy);
1580 } else {
1581 result = DefaultArgumentPromotion(Args[i]);
1582 }
1583 if (result.isInvalid())
1584 return true;
1585 Args[i] = result.get();
1586 }
1587
1588 unsigned DiagID;
1589 if (getLangOpts().ObjCAutoRefCount)
1590 DiagID = diag::err_arc_method_not_found;
1591 else
1592 DiagID = isClassMessage ? diag::warn_class_method_not_found
1593 : diag::warn_inst_method_not_found;
1594 if (!getLangOpts().DebuggerSupport) {
1595 const ObjCMethodDecl *OMD = SelectorsForTypoCorrection(Sel, ReceiverType);
1596 if (OMD && !OMD->isInvalidDecl()) {
1597 if (getLangOpts().ObjCAutoRefCount)
1598 DiagID = diag::err_method_not_found_with_typo;
1599 else
1600 DiagID = isClassMessage ? diag::warn_class_method_not_found_with_typo
1601 : diag::warn_instance_method_not_found_with_typo;
1602 Selector MatchedSel = OMD->getSelector();
1603 SourceRange SelectorRange(SelectorLocs.front(), SelectorLocs.back());
1604 if (MatchedSel.isUnarySelector())
1605 Diag(SelLoc, DiagID)
1606 << Sel<< isClassMessage << MatchedSel
1607 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1608 else
1609 Diag(SelLoc, DiagID) << Sel<< isClassMessage << MatchedSel;
1610 }
1611 else
1612 Diag(SelLoc, DiagID)
1613 << Sel << isClassMessage << SourceRange(SelectorLocs.front(),
1614 SelectorLocs.back());
1615 // Find the class to which we are sending this message.
1616 if (ReceiverType->isObjCObjectPointerType()) {
1617 if (ObjCInterfaceDecl *ThisClass =
1618 ReceiverType->getAs<ObjCObjectPointerType>()->getInterfaceDecl()) {
1619 Diag(ThisClass->getLocation(), diag::note_receiver_class_declared);
1620 if (!RecRange.isInvalid())
1621 if (ThisClass->lookupClassMethod(Sel))
1622 Diag(RecRange.getBegin(),diag::note_receiver_expr_here)
1623 << FixItHint::CreateReplacement(RecRange,
1624 ThisClass->getNameAsString());
1625 }
1626 }
1627 }
1628
1629 // In debuggers, we want to use __unknown_anytype for these
1630 // results so that clients can cast them.
1631 if (getLangOpts().DebuggerSupport) {
1632 ReturnType = Context.UnknownAnyTy;
1633 } else {
1634 ReturnType = Context.getObjCIdType();
1635 }
1636 VK = VK_RValue;
1637 return false;
1638 }
1639
1640 ReturnType = getMessageSendResultType(Receiver, ReceiverType, Method,
1641 isClassMessage, isSuperMessage);
1642 VK = Expr::getValueKindForType(Method->getReturnType());
1643
1644 unsigned NumNamedArgs = Sel.getNumArgs();
1645 // Method might have more arguments than selector indicates. This is due
1646 // to addition of c-style arguments in method.
1647 if (Method->param_size() > Sel.getNumArgs())
1648 NumNamedArgs = Method->param_size();
1649 // FIXME. This need be cleaned up.
1650 if (Args.size() < NumNamedArgs) {
1651 Diag(SelLoc, diag::err_typecheck_call_too_few_args)
1652 << 2 << NumNamedArgs << static_cast<unsigned>(Args.size());
1653 return false;
1654 }
1655
1656 // Compute the set of type arguments to be substituted into each parameter
1657 // type.
1658 Optional<ArrayRef<QualType>> typeArgs
1659 = ReceiverType->getObjCSubstitutions(Method->getDeclContext());
1660 bool IsError = false;
1661 for (unsigned i = 0; i < NumNamedArgs; i++) {
1662 // We can't do any type-checking on a type-dependent argument.
1663 if (Args[i]->isTypeDependent())
1664 continue;
1665
1666 Expr *argExpr = Args[i];
1667
1668 ParmVarDecl *param = Method->parameters()[i];
1669 assert(argExpr && "CheckMessageArgumentTypes(): missing expression")(__builtin_expect(!(argExpr && "CheckMessageArgumentTypes(): missing expression"
), 0) ? __assert_rtn(__func__, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 1669, "argExpr && \"CheckMessageArgumentTypes(): missing expression\""
) : (void)0)
;
1670
1671 if (param->hasAttr<NoEscapeAttr>())
1672 if (auto *BE = dyn_cast<BlockExpr>(
1673 argExpr->IgnoreParenNoopCasts(Context)))
1674 BE->getBlockDecl()->setDoesNotEscape();
1675
1676 // Strip the unbridged-cast placeholder expression off unless it's
1677 // a consumed argument.
1678 if (argExpr->hasPlaceholderType(BuiltinType::ARCUnbridgedCast) &&
1679 !param->hasAttr<CFConsumedAttr>())
1680 argExpr = stripARCUnbridgedCast(argExpr);
1681
1682 // If the parameter is __unknown_anytype, infer its type
1683 // from the argument.
1684 if (param->getType() == Context.UnknownAnyTy) {
1685 QualType paramType;
1686 ExprResult argE = checkUnknownAnyArg(SelLoc, argExpr, paramType);
1687 if (argE.isInvalid()) {
1688 IsError = true;
1689 } else {
1690 Args[i] = argE.get();
1691
1692 // Update the parameter type in-place.
1693 param->setType(paramType);
1694 }
1695 continue;
1696 }
1697
1698 QualType origParamType = param->getType();
1699 QualType paramType = param->getType();
1700 if (typeArgs)
1701 paramType = paramType.substObjCTypeArgs(
1702 Context,
1703 *typeArgs,
1704 ObjCSubstitutionContext::Parameter);
1705
1706 if (RequireCompleteType(argExpr->getSourceRange().getBegin(),
1707 paramType,
1708 diag::err_call_incomplete_argument, argExpr))
1709 return true;
1710
1711 InitializedEntity Entity
1712 = InitializedEntity::InitializeParameter(Context, param, paramType);
1713 ExprResult ArgE = PerformCopyInitialization(Entity, SourceLocation(), argExpr);
1714 if (ArgE.isInvalid())
1715 IsError = true;
1716 else {
1717 Args[i] = ArgE.getAs<Expr>();
1718
1719 // If we are type-erasing a block to a block-compatible
1720 // Objective-C pointer type, we may need to extend the lifetime
1721 // of the block object.
1722 if (typeArgs && Args[i]->isRValue() && paramType->isBlockPointerType() &&
1723 Args[i]->getType()->isBlockPointerType() &&
1724 origParamType->isObjCObjectPointerType()) {
1725 ExprResult arg = Args[i];
1726 maybeExtendBlockObject(arg);
1727 Args[i] = arg.get();
1728 }
1729 }
1730 }
1731
1732 // Promote additional arguments to variadic methods.
1733 if (Method->isVariadic()) {
1734 for (unsigned i = NumNamedArgs, e = Args.size(); i < e; ++i) {
1735 if (Args[i]->isTypeDependent())
1736 continue;
1737
1738 ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], VariadicMethod,
1739 nullptr);
1740 IsError |= Arg.isInvalid();
1741 Args[i] = Arg.get();
1742 }
1743 } else {
1744 // Check for extra arguments to non-variadic methods.
1745 if (Args.size() != NumNamedArgs) {
1746 Diag(Args[NumNamedArgs]->getBeginLoc(),
1747 diag::err_typecheck_call_too_many_args)
1748 << 2 /*method*/ << NumNamedArgs << static_cast<unsigned>(Args.size())
1749 << Method->getSourceRange()
1750 << SourceRange(Args[NumNamedArgs]->getBeginLoc(),
1751 Args.back()->getEndLoc());
1752 }
1753 }
1754
1755 DiagnoseSentinelCalls(Method, SelLoc, Args);
1756
1757 // Do additional checkings on method.
1758 IsError |= CheckObjCMethodCall(
1759 Method, SelLoc, makeArrayRef(Args.data(), Args.size()));
1760
1761 return IsError;
1762}
1763
1764bool Sema::isSelfExpr(Expr *RExpr) {
1765 // 'self' is objc 'self' in an objc method only.
1766 ObjCMethodDecl *Method =
1767 dyn_cast_or_null<ObjCMethodDecl>(CurContext->getNonClosureAncestor());
1768 return isSelfExpr(RExpr, Method);
1769}
1770
1771bool Sema::isSelfExpr(Expr *receiver, const ObjCMethodDecl *method) {
1772 if (!method) return false;
1773
1774 receiver = receiver->IgnoreParenLValueCasts();
1775 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(receiver))
1776 if (DRE->getDecl() == method->getSelfDecl())
1777 return true;
1778 return false;
1779}
1780
1781/// LookupMethodInType - Look up a method in an ObjCObjectType.
1782ObjCMethodDecl *Sema::LookupMethodInObjectType(Selector sel, QualType type,
1783 bool isInstance) {
1784 const ObjCObjectType *objType = type->castAs<ObjCObjectType>();
1785 if (ObjCInterfaceDecl *iface = objType->getInterface()) {
1786 // Look it up in the main interface (and categories, etc.)
1787 if (ObjCMethodDecl *method = iface->lookupMethod(sel, isInstance))
1788 return method;
1789
1790 // Okay, look for "private" methods declared in any
1791 // @implementations we've seen.
1792 if (ObjCMethodDecl *method = iface->lookupPrivateMethod(sel, isInstance))
1793 return method;
1794 }
1795
1796 // Check qualifiers.
1797 for (const auto *I : objType->quals())
1798 if (ObjCMethodDecl *method = I->lookupMethod(sel, isInstance))
1799 return method;
1800
1801 return nullptr;
1802}
1803
1804/// LookupMethodInQualifiedType - Lookups up a method in protocol qualifier
1805/// list of a qualified objective pointer type.
1806ObjCMethodDecl *Sema::LookupMethodInQualifiedType(Selector Sel,
1807 const ObjCObjectPointerType *OPT,
1808 bool Instance)
1809{
1810 ObjCMethodDecl *MD = nullptr;
1811 for (const auto *PROTO : OPT->quals()) {
1812 if ((MD = PROTO->lookupMethod(Sel, Instance))) {
1813 return MD;
1814 }
1815 }
1816 return nullptr;
1817}
1818
1819/// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an
1820/// objective C interface. This is a property reference expression.
1821ExprResult Sema::
1822HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT,
1823 Expr *BaseExpr, SourceLocation OpLoc,
1824 DeclarationName MemberName,
1825 SourceLocation MemberLoc,
1826 SourceLocation SuperLoc, QualType SuperType,
1827 bool Super) {
1828 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType();
1829 ObjCInterfaceDecl *IFace = IFaceT->getDecl();
1830
1831 if (!MemberName.isIdentifier()) {
1832 Diag(MemberLoc, diag::err_invalid_property_name)
1833 << MemberName << QualType(OPT, 0);
1834 return ExprError();
1835 }
1836
1837 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
1838
1839 SourceRange BaseRange = Super? SourceRange(SuperLoc)
1840 : BaseExpr->getSourceRange();
1841 if (RequireCompleteType(MemberLoc, OPT->getPointeeType(),
1842 diag::err_property_not_found_forward_class,
1843 MemberName, BaseRange))
1844 return ExprError();
1845
1846 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(
1847 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1848 // Check whether we can reference this property.
1849 if (DiagnoseUseOfDecl(PD, MemberLoc))
1850 return ExprError();
1851 if (Super)
1852 return new (Context)
1853 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1854 OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1855 else
1856 return new (Context)
1857 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1858 OK_ObjCProperty, MemberLoc, BaseExpr);
1859 }
1860 // Check protocols on qualified interfaces.
1861 for (const auto *I : OPT->quals())
1862 if (ObjCPropertyDecl *PD = I->FindPropertyDeclaration(
1863 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1864 // Check whether we can reference this property.
1865 if (DiagnoseUseOfDecl(PD, MemberLoc))
1866 return ExprError();
1867
1868 if (Super)
1869 return new (Context) ObjCPropertyRefExpr(
1870 PD, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty, MemberLoc,
1871 SuperLoc, SuperType);
1872 else
1873 return new (Context)
1874 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1875 OK_ObjCProperty, MemberLoc, BaseExpr);
1876 }
1877 // If that failed, look for an "implicit" property by seeing if the nullary
1878 // selector is implemented.
1879
1880 // FIXME: The logic for looking up nullary and unary selectors should be
1881 // shared with the code in ActOnInstanceMessage.
1882
1883 Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
1884 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
1885
1886 // May be found in property's qualified list.
1887 if (!Getter)
1888 Getter = LookupMethodInQualifiedType(Sel, OPT, true);
1889
1890 // If this reference is in an @implementation, check for 'private' methods.
1891 if (!Getter)
1892 Getter = IFace->lookupPrivateMethod(Sel);
1893
1894 if (Getter) {
1895 // Check if we can reference this property.
1896 if (DiagnoseUseOfDecl(Getter, MemberLoc))
1897 return ExprError();
1898 }
1899 // If we found a getter then this may be a valid dot-reference, we
1900 // will look for the matching setter, in case it is needed.
1901 Selector SetterSel =
1902 SelectorTable::constructSetterSelector(PP.getIdentifierTable(),
1903 PP.getSelectorTable(), Member);
1904 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel);
1905
1906 // May be found in property's qualified list.
1907 if (!Setter)
1908 Setter = LookupMethodInQualifiedType(SetterSel, OPT, true);
1909
1910 if (!Setter) {
1911 // If this reference is in an @implementation, also check for 'private'
1912 // methods.
1913 Setter = IFace->lookupPrivateMethod(SetterSel);
1914 }
1915
1916 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc))
1917 return ExprError();
1918
1919 // Special warning if member name used in a property-dot for a setter accessor
1920 // does not use a property with same name; e.g. obj.X = ... for a property with
1921 // name 'x'.
1922 if (Setter && Setter->isImplicit() && Setter->isPropertyAccessor() &&
1923 !IFace->FindPropertyDeclaration(
1924 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1925 if (const ObjCPropertyDecl *PDecl = Setter->findPropertyDecl()) {
1926 // Do not warn if user is using property-dot syntax to make call to
1927 // user named setter.
1928 if (!(PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter))
1929 Diag(MemberLoc,
1930 diag::warn_property_access_suggest)
1931 << MemberName << QualType(OPT, 0) << PDecl->getName()
1932 << FixItHint::CreateReplacement(MemberLoc, PDecl->getName());
1933 }
1934 }
1935
1936 if (Getter || Setter) {
1937 if (Super)
1938 return new (Context)
1939 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1940 OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1941 else
1942 return new (Context)
1943 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1944 OK_ObjCProperty, MemberLoc, BaseExpr);
1945
1946 }
1947
1948 // Attempt to correct for typos in property names.
1949 if (TypoCorrection Corrected =
1950 CorrectTypo(DeclarationNameInfo(MemberName, MemberLoc),
1951 LookupOrdinaryName, nullptr, nullptr,
1952 llvm::make_unique<DeclFilterCCC<ObjCPropertyDecl>>(),
1953 CTK_ErrorRecovery, IFace, false, OPT)) {
1954 DeclarationName TypoResult = Corrected.getCorrection();
1955 if (TypoResult.isIdentifier() &&
1956 TypoResult.getAsIdentifierInfo() == Member) {
1957 // There is no need to try the correction if it is the same.
1958 NamedDecl *ChosenDecl =
1959 Corrected.isKeyword() ? nullptr : Corrected.getFoundDecl();
1960 if (ChosenDecl && isa<ObjCPropertyDecl>(ChosenDecl))
1961 if (cast<ObjCPropertyDecl>(ChosenDecl)->isClassProperty()) {
1962 // This is a class property, we should not use the instance to
1963 // access it.
1964 Diag(MemberLoc, diag::err_class_property_found) << MemberName
1965 << OPT->getInterfaceDecl()->getName()
1966 << FixItHint::CreateReplacement(BaseExpr->getSourceRange(),
1967 OPT->getInterfaceDecl()->getName());
1968 return ExprError();
1969 }
1970 } else {
1971 diagnoseTypo(Corrected, PDiag(diag::err_property_not_found_suggest)
1972 << MemberName << QualType(OPT, 0));
1973 return HandleExprPropertyRefExpr(OPT, BaseExpr, OpLoc,
1974 TypoResult, MemberLoc,
1975 SuperLoc, SuperType, Super);
1976 }
1977 }
1978 ObjCInterfaceDecl *ClassDeclared;
1979 if (ObjCIvarDecl *Ivar =
1980 IFace->lookupInstanceVariable(Member, ClassDeclared)) {
1981 QualType T = Ivar->getType();
1982 if (const ObjCObjectPointerType * OBJPT =
1983 T->getAsObjCInterfacePointerType()) {
1984 if (RequireCompleteType(MemberLoc, OBJPT->getPointeeType(),
1985 diag::err_property_not_as_forward_class,
1986 MemberName, BaseExpr))
1987 return ExprError();
1988 }
1989 Diag(MemberLoc,
1990 diag::err_ivar_access_using_property_syntax_suggest)
1991 << MemberName << QualType(OPT, 0) << Ivar->getDeclName()
1992 << FixItHint::CreateReplacement(OpLoc, "->");
1993 return ExprError();
1994 }
1995
1996 Diag(MemberLoc, diag::err_property_not_found)
1997 << MemberName << QualType(OPT, 0);
1998 if (Setter)
1999 Diag(Setter->getLocation(), diag::note_getter_unavailable)
2000 << MemberName << BaseExpr->getSourceRange();
2001 return ExprError();
2002}
2003
2004ExprResult Sema::
2005ActOnClassPropertyRefExpr(IdentifierInfo &receiverName,
2006 IdentifierInfo &propertyName,
2007 SourceLocation receiverNameLoc,
2008 SourceLocation propertyNameLoc) {
2009
2010 IdentifierInfo *receiverNamePtr = &receiverName;
2011 ObjCInterfaceDecl *IFace = getObjCInterfaceDecl(receiverNamePtr,
2012 receiverNameLoc);
2013
2014 QualType SuperType;
2015 if (!IFace) {
2016 // If the "receiver" is 'super' in a method, handle it as an expression-like
2017 // property reference.
2018 if (receiverNamePtr->isStr("super")) {
2019 if (ObjCMethodDecl *CurMethod = tryCaptureObjCSelf(receiverNameLoc)) {
2020 if (auto classDecl = CurMethod->getClassInterface()) {
2021 SuperType = QualType(classDecl->getSuperClassType(), 0);
2022 if (CurMethod->isInstanceMethod()) {
2023 if (SuperType.isNull()) {
2024 // The current class does not have a superclass.
2025 Diag(receiverNameLoc, diag::err_root_class_cannot_use_super)
2026 << CurMethod->getClassInterface()->getIdentifier();
2027 return ExprError();
2028 }
2029 QualType T = Context.getObjCObjectPointerType(SuperType);
2030
2031 return HandleExprPropertyRefExpr(T->castAs<ObjCObjectPointerType>(),
2032 /*BaseExpr*/nullptr,
2033 SourceLocation()/*OpLoc*/,
2034 &propertyName,
2035 propertyNameLoc,
2036 receiverNameLoc, T, true);
2037 }
2038
2039 // Otherwise, if this is a class method, try dispatching to our
2040 // superclass.
2041 IFace = CurMethod->getClassInterface()->getSuperClass();
2042 }
2043 }
2044 }
2045
2046 if (!IFace) {
2047 Diag(receiverNameLoc, diag::err_expected_either) << tok::identifier
2048 << tok::l_paren;
2049 return ExprError();
2050 }
2051 }
2052
2053 Selector GetterSel;
2054 Selector SetterSel;
2055 if (auto PD = IFace->FindPropertyDeclaration(
2056 &propertyName, ObjCPropertyQueryKind::OBJC_PR_query_class)) {
2057 GetterSel = PD->getGetterName();
2058 SetterSel = PD->getSetterName();
2059 } else {
2060 GetterSel = PP.getSelectorTable().getNullarySelector(&propertyName);
2061 SetterSel = SelectorTable::constructSetterSelector(
2062 PP.getIdentifierTable(), PP.getSelectorTable(), &propertyName);
2063 }
2064
2065 // Search for a declared property first.
2066 ObjCMethodDecl *Getter = IFace->lookupClassMethod(GetterSel);
2067
2068 // If this reference is in an @implementation, check for 'private' methods.
2069 if (!Getter)
2070 Getter = IFace->lookupPrivateClassMethod(GetterSel);
2071
2072 if (Getter) {
2073 // FIXME: refactor/share with ActOnMemberReference().
2074 // Check if we can reference this property.
2075 if (DiagnoseUseOfDecl(Getter, propertyNameLoc))
2076 return ExprError();
2077 }
2078
2079 // Look for the matching setter, in case it is needed.
2080 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel);
2081 if (!Setter) {
2082 // If this reference is in an @implementation, also check for 'private'
2083 // methods.
2084 Setter = IFace->lookupPrivateClassMethod(SetterSel);
2085 }
2086 // Look through local category implementations associated with the class.
2087 if (!Setter)
2088 Setter = IFace->getCategoryClassMethod(SetterSel);
2089
2090 if (Setter && DiagnoseUseOfDecl(Setter, propertyNameLoc))
2091 return ExprError();
2092
2093 if (Getter || Setter) {
2094 if (!SuperType.isNull())
2095 return new (Context)
2096 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
2097 OK_ObjCProperty, propertyNameLoc, receiverNameLoc,
2098 SuperType);
2099
2100 return new (Context) ObjCPropertyRefExpr(
2101 Getter, Setter, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty,
2102 propertyNameLoc, receiverNameLoc, IFace);
2103 }
2104 return ExprError(Diag(propertyNameLoc, diag::err_property_not_found)
2105 << &propertyName << Context.getObjCInterfaceType(IFace));
2106}
2107
2108namespace {
2109
2110class ObjCInterfaceOrSuperCCC : public CorrectionCandidateCallback {
2111 public:
2112 ObjCInterfaceOrSuperCCC(ObjCMethodDecl *Method) {
2113 // Determine whether "super" is acceptable in the current context.
2114 if (Method && Method->getClassInterface())
2115 WantObjCSuper = Method->getClassInterface()->getSuperClass();
2116 }
2117
2118 bool ValidateCandidate(const TypoCorrection &candidate) override {
2119 return candidate.getCorrectionDeclAs<ObjCInterfaceDecl>() ||
2120 candidate.isKeyword("super");
2121 }
2122};
2123
2124} // end anonymous namespace
2125
2126Sema::ObjCMessageKind Sema::getObjCMessageKind(Scope *S,
2127 IdentifierInfo *Name,
2128 SourceLocation NameLoc,
2129 bool IsSuper,
2130 bool HasTrailingDot,
2131 ParsedType &ReceiverType) {
2132 ReceiverType = nullptr;
2133
2134 // If the identifier is "super" and there is no trailing dot, we're
2135 // messaging super. If the identifier is "super" and there is a
2136 // trailing dot, it's an instance message.
2137 if (IsSuper && S->isInObjcMethodScope())
2138 return HasTrailingDot? ObjCInstanceMessage : ObjCSuperMessage;
2139
2140 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName);
2141 LookupName(Result, S);
2142
2143 switch (Result.getResultKind()) {
2144 case LookupResult::NotFound:
2145 // Normal name lookup didn't find anything. If we're in an
2146 // Objective-C method, look for ivars. If we find one, we're done!
2147 // FIXME: This is a hack. Ivar lookup should be part of normal
2148 // lookup.
2149 if (ObjCMethodDecl *Method = getCurMethodDecl()) {
2150 if (!Method->getClassInterface()) {
2151 // Fall back: let the parser try to parse it as an instance message.
2152 return ObjCInstanceMessage;
2153 }
2154
2155 ObjCInterfaceDecl *ClassDeclared;
2156 if (Method->getClassInterface()->lookupInstanceVariable(Name,
2157 ClassDeclared))
2158 return ObjCInstanceMessage;
2159 }
2160
2161 // Break out; we'll perform typo correction below.
2162 break;
2163
2164 case LookupResult::NotFoundInCurrentInstantiation:
2165 case LookupResult::FoundOverloaded:
2166 case LookupResult::FoundUnresolvedValue:
2167 case LookupResult::Ambiguous:
2168 Result.suppressDiagnostics();
2169 return ObjCInstanceMessage;
2170
2171 case LookupResult::Found: {
2172 // If the identifier is a class or not, and there is a trailing dot,
2173 // it's an instance message.
2174 if (HasTrailingDot)
2175 return ObjCInstanceMessage;
2176 // We found something. If it's a type, then we have a class
2177 // message. Otherwise, it's an instance message.
2178 NamedDecl *ND = Result.getFoundDecl();
2179 QualType T;
2180 if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND))
2181 T = Context.getObjCInterfaceType(Class);
2182 else if (TypeDecl *Type = dyn_cast<TypeDecl>(ND)) {
2183 T = Context.getTypeDeclType(Type);
2184 DiagnoseUseOfDecl(Type, NameLoc);
2185 }
2186 else
2187 return ObjCInstanceMessage;
2188
2189 // We have a class message, and T is the type we're
2190 // messaging. Build source-location information for it.
2191 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2192 ReceiverType = CreateParsedType(T, TSInfo);
2193 return ObjCClassMessage;
2194 }
2195 }
2196
2197 if (TypoCorrection Corrected = CorrectTypo(
2198 Result.getLookupNameInfo(), Result.getLookupKind(), S, nullptr,
2199 llvm::make_unique<ObjCInterfaceOrSuperCCC>(getCurMethodDecl()),
2200 CTK_ErrorRecovery, nullptr, false, nullptr, false)) {
2201 if (Corrected.isKeyword()) {
2202 // If we've found the keyword "super" (the only keyword that would be
2203 // returned by CorrectTypo), this is a send to super.
2204 diagnoseTypo(Corrected,
2205 PDiag(diag::err_unknown_receiver_suggest) << Name);
2206 return ObjCSuperMessage;
2207 } else if (ObjCInterfaceDecl *Class =
2208 Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>()) {
2209 // If we found a declaration, correct when it refers to an Objective-C
2210 // class.
2211 diagnoseTypo(Corrected,
2212 PDiag(diag::err_unknown_receiver_suggest) << Name);
2213 QualType T = Context.getObjCInterfaceType(Class);
2214 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2215 ReceiverType = CreateParsedType(T, TSInfo);
2216 return ObjCClassMessage;
2217 }
2218 }
2219
2220 // Fall back: let the parser try to parse it as an instance message.
2221 return ObjCInstanceMessage;
2222}
2223
2224ExprResult Sema::ActOnSuperMessage(Scope *S,
2225 SourceLocation SuperLoc,
2226 Selector Sel,
2227 SourceLocation LBracLoc,
2228 ArrayRef<SourceLocation> SelectorLocs,
2229 SourceLocation RBracLoc,
2230 MultiExprArg Args) {
2231 // Determine whether we are inside a method or not.
2232 ObjCMethodDecl *Method = tryCaptureObjCSelf(SuperLoc);
2233 if (!Method) {
1
'Method' is non-null
2
Taking false branch
2234 Diag(SuperLoc, diag::err_invalid_receiver_to_message_super);
2235 return ExprError();
2236 }
2237
2238 ObjCInterfaceDecl *Class = Method->getClassInterface();
2239 if (!Class) {
3
Assuming 'Class' is non-null
4
Taking false branch
2240 Diag(SuperLoc, diag::err_no_super_class_message)
2241 << Method->getDeclName();
2242 return ExprError();
2243 }
2244
2245 QualType SuperTy(Class->getSuperClassType(), 0);
2246 if (SuperTy.isNull()) {
5
The condition is false
6
Taking false branch
2247 // The current class does not have a superclass.
2248 Diag(SuperLoc, diag::err_root_class_cannot_use_super)
2249 << Class->getIdentifier();
2250 return ExprError();
2251 }
2252
2253 // We are in a method whose class has a superclass, so 'super'
2254 // is acting as a keyword.
2255 if (Method->getSelector() == Sel)
7
The condition is false
8
Taking false branch
2256 getCurFunction()->ObjCShouldCallSuper = false;
2257
2258 if (Method->isInstanceMethod()) {
9
Assuming the condition is false
10
Taking false branch
2259 // Since we are in an instance method, this is an instance
2260 // message to the superclass instance.
2261 SuperTy = Context.getObjCObjectPointerType(SuperTy);
2262 return BuildInstanceMessage(nullptr, SuperTy, SuperLoc,
2263 Sel, /*Method=*/nullptr,
2264 LBracLoc, SelectorLocs, RBracLoc, Args);
2265 }
2266
2267 // Since we are in a class method, this is a class message to
2268 // the superclass.
2269 return BuildClassMessage(/*ReceiverTypeInfo=*/nullptr,
11
Passing null pointer value via 1st parameter 'ReceiverTypeInfo'
12
Calling 'Sema::BuildClassMessage'
2270 SuperTy,
2271 SuperLoc, Sel, /*Method=*/nullptr,
2272 LBracLoc, SelectorLocs, RBracLoc, Args);
2273}
2274
2275ExprResult Sema::BuildClassMessageImplicit(QualType ReceiverType,
2276 bool isSuperReceiver,
2277 SourceLocation Loc,
2278 Selector Sel,
2279 ObjCMethodDecl *Method,
2280 MultiExprArg Args) {
2281 TypeSourceInfo *receiverTypeInfo = nullptr;
2282 if (!ReceiverType.isNull())
2283 receiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType);
2284
2285 return BuildClassMessage(receiverTypeInfo, ReceiverType,
2286 /*SuperLoc=*/isSuperReceiver ? Loc : SourceLocation(),
2287 Sel, Method, Loc, Loc, Loc, Args,
2288 /*isImplicit=*/true);
2289}
2290
2291static void applyCocoaAPICheck(Sema &S, const ObjCMessageExpr *Msg,
2292 unsigned DiagID,
2293 bool (*refactor)(const ObjCMessageExpr *,
2294 const NSAPI &, edit::Commit &)) {
2295 SourceLocation MsgLoc = Msg->getExprLoc();
2296 if (S.Diags.isIgnored(DiagID, MsgLoc))
2297 return;
2298
2299 SourceManager &SM = S.SourceMgr;
2300 edit::Commit ECommit(SM, S.LangOpts);
2301 if (refactor(Msg,*S.NSAPIObj, ECommit)) {
2302 DiagnosticBuilder Builder = S.Diag(MsgLoc, DiagID)
2303 << Msg->getSelector() << Msg->getSourceRange();
2304 // FIXME: Don't emit diagnostic at all if fixits are non-commitable.
2305 if (!ECommit.isCommitable())
2306 return;
2307 for (edit::Commit::edit_iterator
2308 I = ECommit.edit_begin(), E = ECommit.edit_end(); I != E; ++I) {
2309 const edit::Commit::Edit &Edit = *I;
2310 switch (Edit.Kind) {
2311 case edit::Commit::Act_Insert:
2312 Builder.AddFixItHint(FixItHint::CreateInsertion(Edit.OrigLoc,
2313 Edit.Text,
2314 Edit.BeforePrev));
2315 break;
2316 case edit::Commit::Act_InsertFromRange:
2317 Builder.AddFixItHint(
2318 FixItHint::CreateInsertionFromRange(Edit.OrigLoc,
2319 Edit.getInsertFromRange(SM),
2320 Edit.BeforePrev));
2321 break;
2322 case edit::Commit::Act_Remove:
2323 Builder.AddFixItHint(FixItHint::CreateRemoval(Edit.getFileRange(SM)));
2324 break;
2325 }
2326 }
2327 }
2328}
2329
2330static void checkCocoaAPI(Sema &S, const ObjCMessageExpr *Msg) {
2331 applyCocoaAPICheck(S, Msg, diag::warn_objc_redundant_literal_use,
2332 edit::rewriteObjCRedundantCallWithLiteral);
2333}
2334
2335static void checkFoundationAPI(Sema &S, SourceLocation Loc,
2336 const ObjCMethodDecl *Method,
2337 ArrayRef<Expr *> Args, QualType ReceiverType,
2338 bool IsClassObjectCall) {
2339 // Check if this is a performSelector method that uses a selector that returns
2340 // a record or a vector type.
2341 if (Method->getSelector().getMethodFamily() != OMF_performSelector ||
2342 Args.empty())
2343 return;
2344 const auto *SE = dyn_cast<ObjCSelectorExpr>(Args[0]->IgnoreParens());
2345 if (!SE)
2346 return;
2347 ObjCMethodDecl *ImpliedMethod;
2348 if (!IsClassObjectCall) {
2349 const auto *OPT = ReceiverType->getAs<ObjCObjectPointerType>();
2350 if (!OPT || !OPT->getInterfaceDecl())
2351 return;
2352 ImpliedMethod =
2353 OPT->getInterfaceDecl()->lookupInstanceMethod(SE->getSelector());
2354 if (!ImpliedMethod)
2355 ImpliedMethod =
2356 OPT->getInterfaceDecl()->lookupPrivateMethod(SE->getSelector());
2357 } else {
2358 const auto *IT = ReceiverType->getAs<ObjCInterfaceType>();
2359 if (!IT)
2360 return;
2361 ImpliedMethod = IT->getDecl()->lookupClassMethod(SE->getSelector());
2362 if (!ImpliedMethod)
2363 ImpliedMethod =
2364 IT->getDecl()->lookupPrivateClassMethod(SE->getSelector());
2365 }
2366 if (!ImpliedMethod)
2367 return;
2368 QualType Ret = ImpliedMethod->getReturnType();
2369 if (Ret->isRecordType() || Ret->isVectorType() || Ret->isExtVectorType()) {
2370 QualType Ret = ImpliedMethod->getReturnType();
2371 S.Diag(Loc, diag::warn_objc_unsafe_perform_selector)
2372 << Method->getSelector()
2373 << (!Ret->isRecordType()
2374 ? /*Vector*/ 2
2375 : Ret->isUnionType() ? /*Union*/ 1 : /*Struct*/ 0);
2376 S.Diag(ImpliedMethod->getBeginLoc(),
2377 diag::note_objc_unsafe_perform_selector_method_declared_here)
2378 << ImpliedMethod->getSelector() << Ret;
2379 }
2380}
2381
2382/// Diagnose use of %s directive in an NSString which is being passed
2383/// as formatting string to formatting method.
2384static void
2385DiagnoseCStringFormatDirectiveInObjCAPI(Sema &S,
2386 ObjCMethodDecl *Method,
2387 Selector Sel,
2388 Expr **Args, unsigned NumArgs) {
2389 unsigned Idx = 0;
2390 bool Format = false;
2391 ObjCStringFormatFamily SFFamily = Sel.getStringFormatFamily();
2392 if (SFFamily == ObjCStringFormatFamily::SFF_NSString) {
2393 Idx = 0;
2394 Format = true;
2395 }
2396 else if (Method) {
2397 for (const auto *I : Method->specific_attrs<FormatAttr>()) {
2398 if (S.GetFormatNSStringIdx(I, Idx)) {
2399 Format = true;
2400 break;
2401 }
2402 }
2403 }
2404 if (!Format || NumArgs <= Idx)
2405 return;
2406
2407 Expr *FormatExpr = Args[Idx];
2408 if (ObjCStringLiteral *OSL =
2409 dyn_cast<ObjCStringLiteral>(FormatExpr->IgnoreParenImpCasts())) {
2410 StringLiteral *FormatString = OSL->getString();
2411 if (S.FormatStringHasSArg(FormatString)) {
2412 S.Diag(FormatExpr->getExprLoc(), diag::warn_objc_cdirective_format_string)
2413 << "%s" << 0 << 0;
2414 if (Method)
2415 S.Diag(Method->getLocation(), diag::note_method_declared_at)
2416 << Method->getDeclName();
2417 }
2418 }
2419}
2420
2421/// Build an Objective-C class message expression.
2422///
2423/// This routine takes care of both normal class messages and
2424/// class messages to the superclass.
2425///
2426/// \param ReceiverTypeInfo Type source information that describes the
2427/// receiver of this message. This may be NULL, in which case we are
2428/// sending to the superclass and \p SuperLoc must be a valid source
2429/// location.
2430
2431/// \param ReceiverType The type of the object receiving the
2432/// message. When \p ReceiverTypeInfo is non-NULL, this is the same
2433/// type as that refers to. For a superclass send, this is the type of
2434/// the superclass.
2435///
2436/// \param SuperLoc The location of the "super" keyword in a
2437/// superclass message.
2438///
2439/// \param Sel The selector to which the message is being sent.
2440///
2441/// \param Method The method that this class message is invoking, if
2442/// already known.
2443///
2444/// \param LBracLoc The location of the opening square bracket ']'.
2445///
2446/// \param RBracLoc The location of the closing square bracket ']'.
2447///
2448/// \param ArgsIn The message arguments.
2449ExprResult Sema::BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo,
2450 QualType ReceiverType,
2451 SourceLocation SuperLoc,
2452 Selector Sel,
2453 ObjCMethodDecl *Method,
2454 SourceLocation LBracLoc,
2455 ArrayRef<SourceLocation> SelectorLocs,
2456 SourceLocation RBracLoc,
2457 MultiExprArg ArgsIn,
2458 bool isImplicit) {
2459 SourceLocation Loc = SuperLoc.isValid()? SuperLoc
13
The condition is false
14
'?' condition is false
2460 : ReceiverTypeInfo->getTypeLoc().getSourceRange().getBegin();
15
Called C++ object pointer is null
2461 if (LBracLoc.isInvalid()) {
2462 Diag(Loc, diag::err_missing_open_square_message_send)
2463 << FixItHint::CreateInsertion(Loc, "[");
2464 LBracLoc = Loc;
2465 }
2466 ArrayRef<SourceLocation> SelectorSlotLocs;
2467 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2468 SelectorSlotLocs = SelectorLocs;
2469 else
2470 SelectorSlotLocs = Loc;
2471 SourceLocation SelLoc = SelectorSlotLocs.front();
2472
2473 if (ReceiverType->isDependentType()) {
2474 // If the receiver type is dependent, we can't type-check anything
2475 // at this point. Build a dependent expression.
2476 unsigned NumArgs = ArgsIn.size();
2477 Expr **Args = ArgsIn.data();
2478 assert(SuperLoc.isInvalid() && "Message to super with dependent type")(__builtin_expect(!(SuperLoc.isInvalid() && "Message to super with dependent type"
), 0) ? __assert_rtn(__func__, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2478, "SuperLoc.isInvalid() && \"Message to super with dependent type\""
) : (void)0)
;
2479 return ObjCMessageExpr::Create(
2480 Context, ReceiverType, VK_RValue, LBracLoc, ReceiverTypeInfo, Sel,
2481 SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs), RBracLoc,
2482 isImplicit);
2483 }
2484
2485 // Find the class to which we are sending this message.
2486 ObjCInterfaceDecl *Class = nullptr;
2487 const ObjCObjectType *ClassType = ReceiverType->getAs<ObjCObjectType>();
2488 if (!ClassType || !(Class = ClassType->getInterface())) {
2489 Diag(Loc, diag::err_invalid_receiver_class_message)
2490 << ReceiverType;
2491 return ExprError();
2492 }
2493 assert(Class && "We don't know which class we're messaging?")(__builtin_expect(!(Class && "We don't know which class we're messaging?"
), 0) ? __assert_rtn(__func__, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2493, "Class && \"We don't know which class we're messaging?\""
) : (void)0)
;
2494 // objc++ diagnoses during typename annotation.
2495 if (!getLangOpts().CPlusPlus)
2496 (void)DiagnoseUseOfDecl(Class, SelectorSlotLocs);
2497 // Find the method we are messaging.
2498 if (!Method) {
2499 SourceRange TypeRange
2500 = SuperLoc.isValid()? SourceRange(SuperLoc)
2501 : ReceiverTypeInfo->getTypeLoc().getSourceRange();
2502 if (RequireCompleteType(Loc, Context.getObjCInterfaceType(Class),
2503 (getLangOpts().ObjCAutoRefCount
2504 ? diag::err_arc_receiver_forward_class
2505 : diag::warn_receiver_forward_class),
2506 TypeRange)) {
2507 // A forward class used in messaging is treated as a 'Class'
2508 Method = LookupFactoryMethodInGlobalPool(Sel,
2509 SourceRange(LBracLoc, RBracLoc));
2510 if (Method && !getLangOpts().ObjCAutoRefCount)
2511 Diag(Method->getLocation(), diag::note_method_sent_forward_class)
2512 << Method->getDeclName();
2513 }
2514 if (!Method)
2515 Method = Class->lookupClassMethod(Sel);
2516
2517 // If we have an implementation in scope, check "private" methods.
2518 if (!Method)
2519 Method = Class->lookupPrivateClassMethod(Sel);
2520
2521 if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs,
2522 nullptr, false, false, Class))
2523 return ExprError();
2524 }
2525
2526 // Check the argument types and determine the result type.
2527 QualType ReturnType;
2528 ExprValueKind VK = VK_RValue;
2529
2530 unsigned NumArgs = ArgsIn.size();
2531 Expr **Args = ArgsIn.data();
2532 if (CheckMessageArgumentTypes(/*Receiver=*/nullptr, ReceiverType,
2533 MultiExprArg(Args, NumArgs), Sel, SelectorLocs,
2534 Method, true, SuperLoc.isValid(), LBracLoc,
2535 RBracLoc, SourceRange(), ReturnType, VK))
2536 return ExprError();
2537
2538 if (Method && !Method->getReturnType()->isVoidType() &&
2539 RequireCompleteType(LBracLoc, Method->getReturnType(),
2540 diag::err_illegal_message_expr_incomplete_type))
2541 return ExprError();
2542
2543 // Warn about explicit call of +initialize on its own class. But not on 'super'.
2544 if (Method && Method->getMethodFamily() == OMF_initialize) {
2545 if (!SuperLoc.isValid()) {
2546 const ObjCInterfaceDecl *ID =
2547 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext());
2548 if (ID == Class) {
2549 Diag(Loc, diag::warn_direct_initialize_call);
2550 Diag(Method->getLocation(), diag::note_method_declared_at)
2551 << Method->getDeclName();
2552 }
2553 }
2554 else if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2555 // [super initialize] is allowed only within an +initialize implementation
2556 if (CurMeth->getMethodFamily() != OMF_initialize) {
2557 Diag(Loc, diag::warn_direct_super_initialize_call);
2558 Diag(Method->getLocation(), diag::note_method_declared_at)
2559 << Method->getDeclName();
2560 Diag(CurMeth->getLocation(), diag::note_method_declared_at)
2561 << CurMeth->getDeclName();
2562 }
2563 }
2564 }
2565
2566 DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
2567
2568 // Construct the appropriate ObjCMessageExpr.
2569 ObjCMessageExpr *Result;
2570 if (SuperLoc.isValid())
2571 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2572 SuperLoc, /*IsInstanceSuper=*/false,
2573 ReceiverType, Sel, SelectorLocs,
2574 Method, makeArrayRef(Args, NumArgs),
2575 RBracLoc, isImplicit);
2576 else {
2577 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2578 ReceiverTypeInfo, Sel, SelectorLocs,
2579 Method, makeArrayRef(Args, NumArgs),
2580 RBracLoc, isImplicit);
2581 if (!isImplicit)
2582 checkCocoaAPI(*this, Result);
2583 }
2584 if (Method)
2585 checkFoundationAPI(*this, SelLoc, Method, makeArrayRef(Args, NumArgs),
2586 ReceiverType, /*IsClassObjectCall=*/true);
2587 return MaybeBindToTemporary(Result);
2588}
2589
2590// ActOnClassMessage - used for both unary and keyword messages.
2591// ArgExprs is optional - if it is present, the number of expressions
2592// is obtained from Sel.getNumArgs().
2593ExprResult Sema::ActOnClassMessage(Scope *S,
2594 ParsedType Receiver,
2595 Selector Sel,
2596 SourceLocation LBracLoc,
2597 ArrayRef<SourceLocation> SelectorLocs,
2598 SourceLocation RBracLoc,
2599 MultiExprArg Args) {
2600 TypeSourceInfo *ReceiverTypeInfo;
2601 QualType ReceiverType = GetTypeFromParser(Receiver, &ReceiverTypeInfo);
2602 if (ReceiverType.isNull())
2603 return ExprError();
2604
2605 if (!ReceiverTypeInfo)
2606 ReceiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType, LBracLoc);
2607
2608 return BuildClassMessage(ReceiverTypeInfo, ReceiverType,
2609 /*SuperLoc=*/SourceLocation(), Sel,
2610 /*Method=*/nullptr, LBracLoc, SelectorLocs, RBracLoc,
2611 Args);
2612}
2613
2614ExprResult Sema::BuildInstanceMessageImplicit(Expr *Receiver,
2615 QualType ReceiverType,
2616 SourceLocation Loc,
2617 Selector Sel,
2618 ObjCMethodDecl *Method,
2619 MultiExprArg Args) {
2620 return BuildInstanceMessage(Receiver, ReceiverType,
2621 /*SuperLoc=*/!Receiver ? Loc : SourceLocation(),
2622 Sel, Method, Loc, Loc, Loc, Args,
2623 /*isImplicit=*/true);
2624}
2625
2626static bool isMethodDeclaredInRootProtocol(Sema &S, const ObjCMethodDecl *M) {
2627 if (!S.NSAPIObj)
2628 return false;
2629 const auto *Protocol = dyn_cast<ObjCProtocolDecl>(M->getDeclContext());
2630 if (!Protocol)
2631 return false;
2632 const IdentifierInfo *II = S.NSAPIObj->getNSClassId(NSAPI::ClassId_NSObject);
2633 if (const auto *RootClass = dyn_cast_or_null<ObjCInterfaceDecl>(
2634 S.LookupSingleName(S.TUScope, II, Protocol->getBeginLoc(),
2635 Sema::LookupOrdinaryName))) {
2636 for (const ObjCProtocolDecl *P : RootClass->all_referenced_protocols()) {
2637 if (P->getCanonicalDecl() == Protocol->getCanonicalDecl())
2638 return true;
2639 }
2640 }
2641 return false;
2642}
2643
2644/// Build an Objective-C instance message expression.
2645///
2646/// This routine takes care of both normal instance messages and
2647/// instance messages to the superclass instance.
2648///
2649/// \param Receiver The expression that computes the object that will
2650/// receive this message. This may be empty, in which case we are
2651/// sending to the superclass instance and \p SuperLoc must be a valid
2652/// source location.
2653///
2654/// \param ReceiverType The (static) type of the object receiving the
2655/// message. When a \p Receiver expression is provided, this is the
2656/// same type as that expression. For a superclass instance send, this
2657/// is a pointer to the type of the superclass.
2658///
2659/// \param SuperLoc The location of the "super" keyword in a
2660/// superclass instance message.
2661///
2662/// \param Sel The selector to which the message is being sent.
2663///
2664/// \param Method The method that this instance message is invoking, if
2665/// already known.
2666///
2667/// \param LBracLoc The location of the opening square bracket ']'.
2668///
2669/// \param RBracLoc The location of the closing square bracket ']'.
2670///
2671/// \param ArgsIn The message arguments.
2672ExprResult Sema::BuildInstanceMessage(Expr *Receiver,
2673 QualType ReceiverType,
2674 SourceLocation SuperLoc,
2675 Selector Sel,
2676 ObjCMethodDecl *Method,
2677 SourceLocation LBracLoc,
2678 ArrayRef<SourceLocation> SelectorLocs,
2679 SourceLocation RBracLoc,
2680 MultiExprArg ArgsIn,
2681 bool isImplicit) {
2682 assert((Receiver || SuperLoc.isValid()) && "If the Receiver is null, the "(__builtin_expect(!((Receiver || SuperLoc.isValid()) &&
"If the Receiver is null, the " "SuperLoc must be valid so we can "
"use it instead."), 0) ? __assert_rtn(__func__, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2684, "(Receiver || SuperLoc.isValid()) && \"If the Receiver is null, the \" \"SuperLoc must be valid so we can \" \"use it instead.\""
) : (void)0)
2683 "SuperLoc must be valid so we can "(__builtin_expect(!((Receiver || SuperLoc.isValid()) &&
"If the Receiver is null, the " "SuperLoc must be valid so we can "
"use it instead."), 0) ? __assert_rtn(__func__, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2684, "(Receiver || SuperLoc.isValid()) && \"If the Receiver is null, the \" \"SuperLoc must be valid so we can \" \"use it instead.\""
) : (void)0)
2684 "use it instead.")(__builtin_expect(!((Receiver || SuperLoc.isValid()) &&
"If the Receiver is null, the " "SuperLoc must be valid so we can "
"use it instead."), 0) ? __assert_rtn(__func__, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2684, "(Receiver || SuperLoc.isValid()) && \"If the Receiver is null, the \" \"SuperLoc must be valid so we can \" \"use it instead.\""
) : (void)0)
;
2685
2686 // The location of the receiver.
2687 SourceLocation Loc = SuperLoc.isValid() ? SuperLoc : Receiver->getBeginLoc();
2688 SourceRange RecRange =
2689 SuperLoc.isValid()? SuperLoc : Receiver->getSourceRange();
2690 ArrayRef<SourceLocation> SelectorSlotLocs;
2691 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2692 SelectorSlotLocs = SelectorLocs;
2693 else
2694 SelectorSlotLocs = Loc;
2695 SourceLocation SelLoc = SelectorSlotLocs.front();
2696
2697 if (LBracLoc.isInvalid()) {
2698 Diag(Loc, diag::err_missing_open_square_message_send)
2699 << FixItHint::CreateInsertion(Loc, "[");
2700 LBracLoc = Loc;
2701 }
2702
2703 // If we have a receiver expression, perform appropriate promotions
2704 // and determine receiver type.
2705 if (Receiver) {
2706 if (Receiver->hasPlaceholderType()) {
2707 ExprResult Result;
2708 if (Receiver->getType() == Context.UnknownAnyTy)
2709 Result = forceUnknownAnyToType(Receiver, Context.getObjCIdType());
2710 else
2711 Result = CheckPlaceholderExpr(Receiver);
2712 if (Result.isInvalid()) return ExprError();
2713 Receiver = Result.get();
2714 }
2715
2716 if (Receiver->isTypeDependent()) {
2717 // If the receiver is type-dependent, we can't type-check anything
2718 // at this point. Build a dependent expression.
2719 unsigned NumArgs = ArgsIn.size();
2720 Expr **Args = ArgsIn.data();
2721 assert(SuperLoc.isInvalid() && "Message to super with dependent type")(__builtin_expect(!(SuperLoc.isInvalid() && "Message to super with dependent type"
), 0) ? __assert_rtn(__func__, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2721, "SuperLoc.isInvalid() && \"Message to super with dependent type\""
) : (void)0)
;
2722 return ObjCMessageExpr::Create(
2723 Context, Context.DependentTy, VK_RValue, LBracLoc, Receiver, Sel,
2724 SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs),
2725 RBracLoc, isImplicit);
2726 }
2727
2728 // If necessary, apply function/array conversion to the receiver.
2729 // C99 6.7.5.3p[7,8].
2730 ExprResult Result = DefaultFunctionArrayLvalueConversion(Receiver);
2731 if (Result.isInvalid())
2732 return ExprError();
2733 Receiver = Result.get();
2734 ReceiverType = Receiver->getType();
2735
2736 // If the receiver is an ObjC pointer, a block pointer, or an
2737 // __attribute__((NSObject)) pointer, we don't need to do any
2738 // special conversion in order to look up a receiver.
2739 if (ReceiverType->isObjCRetainableType()) {
2740 // do nothing
2741 } else if (!getLangOpts().ObjCAutoRefCount &&
2742 !Context.getObjCIdType().isNull() &&
2743 (ReceiverType->isPointerType() ||
2744 ReceiverType->isIntegerType())) {
2745 // Implicitly convert integers and pointers to 'id' but emit a warning.
2746 // But not in ARC.
2747 Diag(Loc, diag::warn_bad_receiver_type)
2748 << ReceiverType
2749 << Receiver->getSourceRange();
2750 if (ReceiverType->isPointerType()) {
2751 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2752 CK_CPointerToObjCPointerCast).get();
2753 } else {
2754 // TODO: specialized warning on null receivers?
2755 bool IsNull = Receiver->isNullPointerConstant(Context,
2756 Expr::NPC_ValueDependentIsNull);
2757 CastKind Kind = IsNull ? CK_NullToPointer : CK_IntegralToPointer;
2758 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2759 Kind).get();
2760 }
2761 ReceiverType = Receiver->getType();
2762 } else if (getLangOpts().CPlusPlus) {
2763 // The receiver must be a complete type.
2764 if (RequireCompleteType(Loc, Receiver->getType(),
2765 diag::err_incomplete_receiver_type))
2766 return ExprError();
2767
2768 ExprResult result = PerformContextuallyConvertToObjCPointer(Receiver);
2769 if (result.isUsable()) {
2770 Receiver = result.get();
2771 ReceiverType = Receiver->getType();
2772 }
2773 }
2774 }
2775
2776 if (ReceiverType->isObjCIdType() && !isImplicit)
2777 Diag(Receiver->getExprLoc(), diag::warn_messaging_unqualified_id);
2778
2779 // There's a somewhat weird interaction here where we assume that we
2780 // won't actually have a method unless we also don't need to do some
2781 // of the more detailed type-checking on the receiver.
2782
2783 if (!Method) {
2784 // Handle messages to id and __kindof types (where we use the
2785 // global method pool).
2786 const ObjCObjectType *typeBound = nullptr;
2787 bool receiverIsIdLike = ReceiverType->isObjCIdOrObjectKindOfType(Context,
2788 typeBound);
2789 if (receiverIsIdLike || ReceiverType->isBlockPointerType() ||
2790 (Receiver && Context.isObjCNSObjectType(Receiver->getType()))) {
2791 SmallVector<ObjCMethodDecl*, 4> Methods;
2792 // If we have a type bound, further filter the methods.
2793 CollectMultipleMethodsInGlobalPool(Sel, Methods, true/*InstanceFirst*/,
2794 true/*CheckTheOther*/, typeBound);
2795 if (!Methods.empty()) {
2796 // We choose the first method as the initial candidate, then try to
2797 // select a better one.
2798 Method = Methods[0];
2799
2800 if (ObjCMethodDecl *BestMethod =
2801 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(), Methods))
2802 Method = BestMethod;
2803
2804 if (!AreMultipleMethodsInGlobalPool(Sel, Method,
2805 SourceRange(LBracLoc, RBracLoc),
2806 receiverIsIdLike, Methods))
2807 DiagnoseUseOfDecl(Method, SelectorSlotLocs);
2808 }
2809 } else if (ReceiverType->isObjCClassOrClassKindOfType() ||
2810 ReceiverType->isObjCQualifiedClassType()) {
2811 // Handle messages to Class.
2812 // We allow sending a message to a qualified Class ("Class<foo>"), which
2813 // is ok as long as one of the protocols implements the selector (if not,
2814 // warn).
2815 if (!ReceiverType->isObjCClassOrClassKindOfType()) {
2816 const ObjCObjectPointerType *QClassTy
2817 = ReceiverType->getAsObjCQualifiedClassType();
2818 // Search protocols for class methods.
2819 Method = LookupMethodInQualifiedType(Sel, QClassTy, false);
2820 if (!Method) {
2821 Method = LookupMethodInQualifiedType(Sel, QClassTy, true);
2822 // warn if instance method found for a Class message.
2823 if (Method && !isMethodDeclaredInRootProtocol(*this, Method)) {
2824 Diag(SelLoc, diag::warn_instance_method_on_class_found)
2825 << Method->getSelector() << Sel;
2826 Diag(Method->getLocation(), diag::note_method_declared_at)
2827 << Method->getDeclName();
2828 }
2829 }
2830 } else {
2831 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2832 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) {
2833 // As a guess, try looking for the method in the current interface.
2834 // This very well may not produce the "right" method.
2835
2836 // First check the public methods in the class interface.
2837 Method = ClassDecl->lookupClassMethod(Sel);
2838
2839 if (!Method)
2840 Method = ClassDecl->lookupPrivateClassMethod(Sel);
2841
2842 if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs))
2843 return ExprError();
2844 }
2845 }
2846 if (!Method) {
2847 // If not messaging 'self', look for any factory method named 'Sel'.
2848 if (!Receiver || !isSelfExpr(Receiver)) {
2849 // If no class (factory) method was found, check if an _instance_
2850 // method of the same name exists in the root class only.
2851 SmallVector<ObjCMethodDecl*, 4> Methods;
2852 CollectMultipleMethodsInGlobalPool(Sel, Methods,
2853 false/*InstanceFirst*/,
2854 true/*CheckTheOther*/);
2855 if (!Methods.empty()) {
2856 // We choose the first method as the initial candidate, then try
2857 // to select a better one.
2858 Method = Methods[0];
2859
2860 // If we find an instance method, emit warning.
2861 if (Method->isInstanceMethod()) {
2862 if (const ObjCInterfaceDecl *ID =
2863 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext())) {
2864 if (ID->getSuperClass())
2865 Diag(SelLoc, diag::warn_root_inst_method_not_found)
2866 << Sel << SourceRange(LBracLoc, RBracLoc);
2867 }
2868 }
2869
2870 if (ObjCMethodDecl *BestMethod =
2871 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(),
2872 Methods))
2873 Method = BestMethod;
2874 }
2875 }
2876 }
2877 }
2878 } else {
2879 ObjCInterfaceDecl *ClassDecl = nullptr;
2880
2881 // We allow sending a message to a qualified ID ("id<foo>"), which is ok as
2882 // long as one of the protocols implements the selector (if not, warn).
2883 // And as long as message is not deprecated/unavailable (warn if it is).
2884 if (const ObjCObjectPointerType *QIdTy
2885 = ReceiverType->getAsObjCQualifiedIdType()) {
2886 // Search protocols for instance methods.
2887 Method = LookupMethodInQualifiedType(Sel, QIdTy, true);
2888 if (!Method)
2889 Method = LookupMethodInQualifiedType(Sel, QIdTy, false);
2890 if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs))
2891 return ExprError();
2892 } else if (const ObjCObjectPointerType *OCIType
2893 = ReceiverType->getAsObjCInterfacePointerType()) {
2894 // We allow sending a message to a pointer to an interface (an object).
2895 ClassDecl = OCIType->getInterfaceDecl();
2896
2897 // Try to complete the type. Under ARC, this is a hard error from which
2898 // we don't try to recover.
2899 // FIXME: In the non-ARC case, this will still be a hard error if the
2900 // definition is found in a module that's not visible.
2901 const ObjCInterfaceDecl *forwardClass = nullptr;
2902 if (RequireCompleteType(Loc, OCIType->getPointeeType(),
2903 getLangOpts().ObjCAutoRefCount
2904 ? diag::err_arc_receiver_forward_instance
2905 : diag::warn_receiver_forward_instance,
2906 Receiver? Receiver->getSourceRange()
2907 : SourceRange(SuperLoc))) {
2908 if (getLangOpts().ObjCAutoRefCount)
2909 return ExprError();
2910
2911 forwardClass = OCIType->getInterfaceDecl();
2912 Diag(Receiver ? Receiver->getBeginLoc() : SuperLoc,
2913 diag::note_receiver_is_id);
2914 Method = nullptr;
2915 } else {
2916 Method = ClassDecl->lookupInstanceMethod(Sel);
2917 }
2918
2919 if (!Method)
2920 // Search protocol qualifiers.
2921 Method = LookupMethodInQualifiedType(Sel, OCIType, true);
2922
2923 if (!Method) {
2924 // If we have implementations in scope, check "private" methods.
2925 Method = ClassDecl->lookupPrivateMethod(Sel);
2926
2927 if (!Method && getLangOpts().ObjCAutoRefCount) {
2928 Diag(SelLoc, diag::err_arc_may_not_respond)
2929 << OCIType->getPointeeType() << Sel << RecRange
2930 << SourceRange(SelectorLocs.front(), SelectorLocs.back());
2931 return ExprError();
2932 }
2933
2934 if (!Method && (!Receiver || !isSelfExpr(Receiver))) {
2935 // If we still haven't found a method, look in the global pool. This
2936 // behavior isn't very desirable, however we need it for GCC
2937 // compatibility. FIXME: should we deviate??
2938 if (OCIType->qual_empty()) {
2939 SmallVector<ObjCMethodDecl*, 4> Methods;
2940 CollectMultipleMethodsInGlobalPool(Sel, Methods,
2941 true/*InstanceFirst*/,
2942 false/*CheckTheOther*/);
2943 if (!Methods.empty()) {
2944 // We choose the first method as the initial candidate, then try
2945 // to select a better one.
2946 Method = Methods[0];
2947
2948 if (ObjCMethodDecl *BestMethod =
2949 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(),
2950 Methods))
2951 Method = BestMethod;
2952
2953 AreMultipleMethodsInGlobalPool(Sel, Method,
2954 SourceRange(LBracLoc, RBracLoc),
2955 true/*receiverIdOrClass*/,
2956 Methods);
2957 }
2958 if (Method && !forwardClass)
2959 Diag(SelLoc, diag::warn_maynot_respond)
2960 << OCIType->getInterfaceDecl()->getIdentifier()
2961 << Sel << RecRange;
2962 }
2963 }
2964 }
2965 if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs, forwardClass))
2966 return ExprError();
2967 } else {
2968 // Reject other random receiver types (e.g. structs).
2969 Diag(Loc, diag::err_bad_receiver_type)
2970 << ReceiverType << Receiver->getSourceRange();
2971 return ExprError();
2972 }
2973 }
2974 }
2975
2976 FunctionScopeInfo *DIFunctionScopeInfo =
2977 (Method && Method->getMethodFamily() == OMF_init)
2978 ? getEnclosingFunction() : nullptr;
2979
2980 if (DIFunctionScopeInfo &&
2981 DIFunctionScopeInfo->ObjCIsDesignatedInit &&
2982 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2983 bool isDesignatedInitChain = false;
2984 if (SuperLoc.isValid()) {
2985 if (const ObjCObjectPointerType *
2986 OCIType = ReceiverType->getAsObjCInterfacePointerType()) {
2987 if (const ObjCInterfaceDecl *ID = OCIType->getInterfaceDecl()) {
2988 // Either we know this is a designated initializer or we
2989 // conservatively assume it because we don't know for sure.
2990 if (!ID->declaresOrInheritsDesignatedInitializers() ||
2991 ID->isDesignatedInitializer(Sel)) {
2992 isDesignatedInitChain = true;
2993 DIFunctionScopeInfo->ObjCWarnForNoDesignatedInitChain = false;
2994 }
2995 }
2996 }
2997 }
2998 if (!isDesignatedInitChain) {
2999 const ObjCMethodDecl *InitMethod = nullptr;
3000 bool isDesignated =
3001 getCurMethodDecl()->isDesignatedInitializerForTheInterface(&InitMethod);
3002 assert(isDesignated && InitMethod)(__builtin_expect(!(isDesignated && InitMethod), 0) ?
__assert_rtn(__func__, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 3002, "isDesignated && InitMethod") : (void)0)
;
3003 (void)isDesignated;
3004 Diag(SelLoc, SuperLoc.isValid() ?
3005 diag::warn_objc_designated_init_non_designated_init_call :
3006 diag::warn_objc_designated_init_non_super_designated_init_call);
3007 Diag(InitMethod->getLocation(),
3008 diag::note_objc_designated_init_marked_here);
3009 }
3010 }
3011
3012 if (DIFunctionScopeInfo &&
3013 DIFunctionScopeInfo->ObjCIsSecondaryInit &&
3014 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
3015 if (SuperLoc.isValid()) {
3016 Diag(SelLoc, diag::warn_objc_secondary_init_super_init_call);
3017 } else {
3018 DIFunctionScopeInfo->ObjCWarnForNoInitDelegation = false;
3019 }
3020 }
3021
3022 // Check the message arguments.
3023 unsigned NumArgs = ArgsIn.size();
3024 Expr **Args = ArgsIn.data();
3025 QualType ReturnType;
3026 ExprValueKind VK = VK_RValue;
3027 bool ClassMessage = (ReceiverType->isObjCClassType() ||
3028 ReceiverType->isObjCQualifiedClassType());
3029 if (CheckMessageArgumentTypes(Receiver, ReceiverType,
3030 MultiExprArg(Args, NumArgs), Sel, SelectorLocs,
3031 Method, ClassMessage, SuperLoc.isValid(),
3032 LBracLoc, RBracLoc, RecRange, ReturnType, VK))
3033 return ExprError();
3034
3035 if (Method && !Method->getReturnType()->isVoidType() &&
3036 RequireCompleteType(LBracLoc, Method->getReturnType(),
3037 diag::err_illegal_message_expr_incomplete_type))
3038 return ExprError();
3039
3040 // In ARC, forbid the user from sending messages to
3041 // retain/release/autorelease/dealloc/retainCount explicitly.
3042 if (getLangOpts().ObjCAutoRefCount) {
3043 ObjCMethodFamily family =
3044 (Method ? Method->getMethodFamily() : Sel.getMethodFamily());
3045 switch (family) {
3046 case OMF_init:
3047 if (Method)
3048 checkInitMethod(Method, ReceiverType);
3049 break;
3050
3051 case OMF_None:
3052 case OMF_alloc:
3053 case OMF_copy:
3054 case OMF_finalize:
3055 case OMF_mutableCopy:
3056 case OMF_new:
3057 case OMF_self:
3058 case OMF_initialize:
3059 break;
3060
3061 case OMF_dealloc:
3062 case OMF_retain:
3063 case OMF_release:
3064 case OMF_autorelease:
3065 case OMF_retainCount:
3066 Diag(SelLoc, diag::err_arc_illegal_explicit_message)
3067 << Sel << RecRange;
3068 break;
3069
3070 case OMF_performSelector:
3071 if (Method && NumArgs >= 1) {
3072 if (const auto *SelExp =
3073 dyn_cast<ObjCSelectorExpr>(Args[0]->IgnoreParens())) {
3074 Selector ArgSel = SelExp->getSelector();
3075 ObjCMethodDecl *SelMethod =
3076 LookupInstanceMethodInGlobalPool(ArgSel,
3077 SelExp->getSourceRange());
3078 if (!SelMethod)
3079 SelMethod =
3080 LookupFactoryMethodInGlobalPool(ArgSel,
3081 SelExp->getSourceRange());
3082 if (SelMethod) {
3083 ObjCMethodFamily SelFamily = SelMethod->getMethodFamily();
3084 switch (SelFamily) {
3085 case OMF_alloc:
3086 case OMF_copy:
3087 case OMF_mutableCopy:
3088 case OMF_new:
3089 case OMF_init:
3090 // Issue error, unless ns_returns_not_retained.
3091 if (!SelMethod->hasAttr<NSReturnsNotRetainedAttr>()) {
3092 // selector names a +1 method
3093 Diag(SelLoc,
3094 diag::err_arc_perform_selector_retains);
3095 Diag(SelMethod->getLocation(), diag::note_method_declared_at)
3096 << SelMethod->getDeclName();
3097 }
3098 break;
3099 default:
3100 // +0 call. OK. unless ns_returns_retained.
3101 if (SelMethod->hasAttr<NSReturnsRetainedAttr>()) {
3102 // selector names a +1 method
3103 Diag(SelLoc,
3104 diag::err_arc_perform_selector_retains);
3105 Diag(SelMethod->getLocation(), diag::note_method_declared_at)
3106 << SelMethod->getDeclName();
3107 }
3108 break;
3109 }
3110 }
3111 } else {
3112 // error (may leak).
3113 Diag(SelLoc, diag::warn_arc_perform_selector_leaks);
3114 Diag(Args[0]->getExprLoc(), diag::note_used_here);
3115 }
3116 }
3117 break;
3118 }
3119 }
3120
3121 DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
3122
3123 // Construct the appropriate ObjCMessageExpr instance.
3124 ObjCMessageExpr *Result;
3125 if (SuperLoc.isValid())
3126 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
3127 SuperLoc, /*IsInstanceSuper=*/true,
3128 ReceiverType, Sel, SelectorLocs, Method,
3129 makeArrayRef(Args, NumArgs), RBracLoc,
3130 isImplicit);
3131 else {
3132 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
3133 Receiver, Sel, SelectorLocs, Method,
3134 makeArrayRef(Args, NumArgs), RBracLoc,
3135 isImplicit);
3136 if (!isImplicit)
3137 checkCocoaAPI(*this, Result);
3138 }
3139 if (Method) {
3140 bool IsClassObjectCall = ClassMessage;
3141 // 'self' message receivers in class methods should be treated as message
3142 // sends to the class object in order for the semantic checks to be
3143 // performed correctly. Messages to 'super' already count as class messages,
3144 // so they don't need to be handled here.
3145 if (Receiver && isSelfExpr(Receiver)) {
3146 if (const auto *OPT = ReceiverType->getAs<ObjCObjectPointerType>()) {
3147 if (OPT->getObjectType()->isObjCClass()) {
3148 if (const auto *CurMeth = getCurMethodDecl()) {
3149 IsClassObjectCall = true;
3150 ReceiverType =
3151 Context.getObjCInterfaceType(CurMeth->getClassInterface());
3152 }
3153 }
3154 }
3155 }
3156 checkFoundationAPI(*this, SelLoc, Method, makeArrayRef(Args, NumArgs),
3157 ReceiverType, IsClassObjectCall);
3158 }
3159
3160 if (getLangOpts().ObjCAutoRefCount) {
3161 // In ARC, annotate delegate init calls.
3162 if (Result->getMethodFamily() == OMF_init &&
3163 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
3164 // Only consider init calls *directly* in init implementations,
3165 // not within blocks.
3166 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(CurContext);
3167 if (method && method->getMethodFamily() == OMF_init) {
3168 // The implicit assignment to self means we also don't want to
3169 // consume the result.
3170 Result->setDelegateInitCall(true);
3171 return Result;
3172 }
3173 }
3174
3175 // In ARC, check for message sends which are likely to introduce
3176 // retain cycles.
3177 checkRetainCycles(Result);
3178 }
3179
3180 if (getLangOpts().ObjCWeak) {
3181 if (!isImplicit && Method) {
3182 if (const ObjCPropertyDecl *Prop = Method->findPropertyDecl()) {
3183 bool IsWeak =
3184 Prop->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak;
3185 if (!IsWeak && Sel.isUnarySelector())
3186 IsWeak = ReturnType.getObjCLifetime() & Qualifiers::OCL_Weak;
3187 if (IsWeak && !isUnevaluatedContext() &&
3188 !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, LBracLoc))
3189 getCurFunction()->recordUseOfWeak(Result, Prop);
3190 }
3191 }
3192 }
3193
3194 CheckObjCCircularContainer(Result);
3195
3196 return MaybeBindToTemporary(Result);
3197}
3198
3199static void RemoveSelectorFromWarningCache(Sema &S, Expr* Arg) {
3200 if (ObjCSelectorExpr *OSE =
3201 dyn_cast<ObjCSelectorExpr>(Arg->IgnoreParenCasts())) {
3202 Selector Sel = OSE->getSelector();
3203 SourceLocation Loc = OSE->getAtLoc();
3204 auto Pos = S.ReferencedSelectors.find(Sel);
3205 if (Pos != S.ReferencedSelectors.end() && Pos->second == Loc)
3206 S.ReferencedSelectors.erase(Pos);
3207 }
3208}
3209
3210// ActOnInstanceMessage - used for both unary and keyword messages.
3211// ArgExprs is optional - if it is present, the number of expressions
3212// is obtained from Sel.getNumArgs().
3213ExprResult Sema::ActOnInstanceMessage(Scope *S,
3214 Expr *Receiver,
3215 Selector Sel,
3216 SourceLocation LBracLoc,
3217 ArrayRef<SourceLocation> SelectorLocs,
3218 SourceLocation RBracLoc,
3219 MultiExprArg Args) {
3220 if (!Receiver)
3221 return ExprError();
3222
3223 // A ParenListExpr can show up while doing error recovery with invalid code.
3224 if (isa<ParenListExpr>(Receiver)) {
3225 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Receiver);
3226 if (Result.isInvalid()) return ExprError();
3227 Receiver = Result.get();
3228 }
3229
3230 if (RespondsToSelectorSel.isNull()) {
3231 IdentifierInfo *SelectorId = &Context.Idents.get("respondsToSelector");
3232 RespondsToSelectorSel = Context.Selectors.getUnarySelector(SelectorId);
3233 }
3234 if (Sel == RespondsToSelectorSel)
3235 RemoveSelectorFromWarningCache(*this, Args[0]);
3236
3237 return BuildInstanceMessage(Receiver, Receiver->getType(),
3238 /*SuperLoc=*/SourceLocation(), Sel,
3239 /*Method=*/nullptr, LBracLoc, SelectorLocs,
3240 RBracLoc, Args);
3241}
3242
3243enum ARCConversionTypeClass {
3244 /// int, void, struct A
3245 ACTC_none,
3246
3247 /// id, void (^)()
3248 ACTC_retainable,
3249
3250 /// id*, id***, void (^*)(),
3251 ACTC_indirectRetainable,
3252
3253 /// void* might be a normal C type, or it might a CF type.
3254 ACTC_voidPtr,
3255
3256 /// struct A*
3257 ACTC_coreFoundation
3258};
3259
3260static bool isAnyRetainable(ARCConversionTypeClass ACTC) {
3261 return (ACTC == ACTC_retainable ||
3262 ACTC == ACTC_coreFoundation ||
3263 ACTC == ACTC_voidPtr);
3264}
3265
3266static bool isAnyCLike(ARCConversionTypeClass ACTC) {
3267 return ACTC == ACTC_none ||
3268 ACTC == ACTC_voidPtr ||
3269 ACTC == ACTC_coreFoundation;
3270}
3271
3272static ARCConversionTypeClass classifyTypeForARCConversion(QualType type) {
3273 bool isIndirect = false;
3274
3275 // Ignore an outermost reference type.
3276 if (const ReferenceType *ref = type->getAs<ReferenceType>()) {
3277 type = ref->getPointeeType();
3278 isIndirect = true;
3279 }
3280
3281 // Drill through pointers and arrays recursively.
3282 while (true) {
3283 if (const PointerType *ptr = type->getAs<PointerType>()) {
3284 type = ptr->getPointeeType();
3285
3286 // The first level of pointer may be the innermost pointer on a CF type.
3287 if (!isIndirect) {
3288 if (type->isVoidType()) return ACTC_voidPtr;
3289 if (type->isRecordType()) return ACTC_coreFoundation;
3290 }
3291 } else if (const ArrayType *array = type->getAsArrayTypeUnsafe()) {
3292 type = QualType(array->getElementType()->getBaseElementTypeUnsafe(), 0);
3293 } else {
3294 break;
3295 }
3296 isIndirect = true;
3297 }
3298
3299 if (isIndirect) {
3300 if (type->isObjCARCBridgableType())
3301 return ACTC_indirectRetainable;
3302 return ACTC_none;
3303 }
3304
3305 if (type->isObjCARCBridgableType())
3306 return ACTC_retainable;
3307
3308 return ACTC_none;
3309}
3310
3311namespace {
3312 /// A result from the cast checker.
3313 enum ACCResult {
3314 /// Cannot be casted.
3315 ACC_invalid,
3316
3317 /// Can be safely retained or not retained.
3318 ACC_bottom,
3319
3320 /// Can be casted at +0.
3321 ACC_plusZero,
3322
3323 /// Can be casted at +1.
3324 ACC_plusOne
3325 };
3326 ACCResult merge(ACCResult left, ACCResult right) {
3327 if (left == right) return left;
3328 if (left == ACC_bottom) return right;
3329 if (right == ACC_bottom) return left;
3330 return ACC_invalid;
3331 }
3332
3333 /// A checker which white-lists certain expressions whose conversion
3334 /// to or from retainable type would otherwise be forbidden in ARC.
3335 class ARCCastChecker : public StmtVisitor<ARCCastChecker, ACCResult> {
3336 typedef StmtVisitor<ARCCastChecker, ACCResult> super;
3337
3338 ASTContext &Context;
3339 ARCConversionTypeClass SourceClass;
3340 ARCConversionTypeClass TargetClass;
3341 bool Diagnose;
3342
3343 static bool isCFType(QualType type) {
3344 // Someday this can use ns_bridged. For now, it has to do this.
3345 return type->isCARCBridgableType();
3346 }
3347
3348 public:
3349 ARCCastChecker(ASTContext &Context, ARCConversionTypeClass source,
3350 ARCConversionTypeClass target, bool diagnose)
3351 : Context(Context), SourceClass(source), TargetClass(target),
3352 Diagnose(diagnose) {}
3353
3354 using super::Visit;
3355 ACCResult Visit(Expr *e) {
3356 return super::Visit(e->IgnoreParens());
3357 }
3358
3359 ACCResult VisitStmt(Stmt *s) {
3360 return ACC_invalid;
3361 }
3362
3363 /// Null pointer constants can be casted however you please.
3364 ACCResult VisitExpr(Expr *e) {
3365 if (e->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull))
3366 return ACC_bottom;
3367 return ACC_invalid;
3368 }
3369
3370 /// Objective-C string literals can be safely casted.
3371 ACCResult VisitObjCStringLiteral(ObjCStringLiteral *e) {
3372 // If we're casting to any retainable type, go ahead. Global
3373 // strings are immune to retains, so this is bottom.
3374 if (isAnyRetainable(TargetClass)) return ACC_bottom;
3375
3376 return ACC_invalid;
3377 }
3378
3379 /// Look through certain implicit and explicit casts.
3380 ACCResult VisitCastExpr(CastExpr *e) {
3381 switch (e->getCastKind()) {
3382 case CK_NullToPointer:
3383 return ACC_bottom;
3384
3385 case CK_NoOp:
3386 case CK_LValueToRValue:
3387 case CK_BitCast:
3388 case CK_CPointerToObjCPointerCast:
3389 case CK_BlockPointerToObjCPointerCast:
3390 case CK_AnyPointerToBlockPointerCast:
3391 return Visit(e->getSubExpr());
3392
3393 default:
3394 return ACC_invalid;
3395 }
3396 }
3397
3398 /// Look through unary extension.
3399 ACCResult VisitUnaryExtension(UnaryOperator *e) {
3400 return Visit(e->getSubExpr());
3401 }
3402
3403 /// Ignore the LHS of a comma operator.
3404 ACCResult VisitBinComma(BinaryOperator *e) {
3405 return Visit(e->getRHS());
3406 }
3407
3408 /// Conditional operators are okay if both sides are okay.
3409 ACCResult VisitConditionalOperator(ConditionalOperator *e) {
3410 ACCResult left = Visit(e->getTrueExpr());
3411 if (left == ACC_invalid) return ACC_invalid;
3412 return merge(left, Visit(e->getFalseExpr()));
3413 }
3414
3415 /// Look through pseudo-objects.
3416 ACCResult VisitPseudoObjectExpr(PseudoObjectExpr *e) {
3417 // If we're getting here, we should always have a result.
3418 return Visit(e->getResultExpr());
3419 }
3420
3421 /// Statement expressions are okay if their result expression is okay.
3422 ACCResult VisitStmtExpr(StmtExpr *e) {
3423 return Visit(e->getSubStmt()->body_back());
3424 }
3425
3426 /// Some declaration references are okay.
3427 ACCResult VisitDeclRefExpr(DeclRefExpr *e) {
3428 VarDecl *var = dyn_cast<VarDecl>(e->getDecl());
3429 // References to global constants are okay.
3430 if (isAnyRetainable(TargetClass) &&
3431 isAnyRetainable(SourceClass) &&
3432 var &&
3433 !var->hasDefinition(Context) &&
3434 var->getType().isConstQualified()) {
3435
3436 // In system headers, they can also be assumed to be immune to retains.
3437 // These are things like 'kCFStringTransformToLatin'.
3438 if (Context.getSourceManager().isInSystemHeader(var->getLocation()))
3439 return ACC_bottom;
3440
3441 return ACC_plusZero;
3442 }
3443
3444 // Nothing else.
3445 return ACC_invalid;
3446 }
3447
3448 /// Some calls are okay.
3449 ACCResult VisitCallExpr(CallExpr *e) {
3450 if (FunctionDecl *fn = e->getDirectCallee())
3451 if (ACCResult result = checkCallToFunction(fn))
3452 return result;
3453
3454 return super::VisitCallExpr(e);
3455 }
3456
3457 ACCResult checkCallToFunction(FunctionDecl *fn) {
3458 // Require a CF*Ref return type.
3459 if (!isCFType(fn->getReturnType()))
3460 return ACC_invalid;
3461
3462 if (!isAnyRetainable(TargetClass))
3463 return ACC_invalid;
3464
3465 // Honor an explicit 'not retained' attribute.
3466 if (fn->hasAttr<CFReturnsNotRetainedAttr>())
3467 return ACC_plusZero;
3468
3469 // Honor an explicit 'retained' attribute, except that for
3470 // now we're not going to permit implicit handling of +1 results,
3471 // because it's a bit frightening.
3472 if (fn->hasAttr<CFReturnsRetainedAttr>())
3473 return Diagnose ? ACC_plusOne
3474 : ACC_invalid; // ACC_plusOne if we start accepting this
3475
3476 // Recognize this specific builtin function, which is used by CFSTR.
3477 unsigned builtinID = fn->getBuiltinID();
3478 if (builtinID == Builtin::BI__builtin___CFStringMakeConstantString)
3479 return ACC_bottom;
3480
3481 // Otherwise, don't do anything implicit with an unaudited function.
3482 if (!fn->hasAttr<CFAuditedTransferAttr>())
3483 return ACC_invalid;
3484
3485 // Otherwise, it's +0 unless it follows the create convention.
3486 if (ento::coreFoundation::followsCreateRule(fn))
3487 return Diagnose ? ACC_plusOne
3488 : ACC_invalid; // ACC_plusOne if we start accepting this
3489
3490 return ACC_plusZero;
3491 }
3492
3493 ACCResult VisitObjCMessageExpr(ObjCMessageExpr *e) {
3494 return checkCallToMethod(e->getMethodDecl());
3495 }
3496
3497 ACCResult VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *e) {
3498 ObjCMethodDecl *method;
3499 if (e->isExplicitProperty())
3500 method = e->getExplicitProperty()->getGetterMethodDecl();
3501 else
3502 method = e->getImplicitPropertyGetter();
3503 return checkCallToMethod(method);
3504 }
3505
3506 ACCResult checkCallToMethod(ObjCMethodDecl *method) {
3507 if (!method) return ACC_invalid;
3508
3509 // Check for message sends to functions returning CF types. We
3510 // just obey the Cocoa conventions with these, even though the
3511 // return type is CF.
3512 if (!isAnyRetainable(TargetClass) || !isCFType(method->getReturnType()))
3513 return ACC_invalid;
3514
3515 // If the method is explicitly marked not-retained, it's +0.
3516 if (method->hasAttr<CFReturnsNotRetainedAttr>())
3517 return ACC_plusZero;
3518
3519 // If the method is explicitly marked as returning retained, or its
3520 // selector follows a +1 Cocoa convention, treat it as +1.
3521 if (method->hasAttr<CFReturnsRetainedAttr>())
3522 return ACC_plusOne;
3523
3524 switch (method->getSelector().getMethodFamily()) {
3525 case OMF_alloc:
3526 case OMF_copy:
3527 case OMF_mutableCopy:
3528 case OMF_new:
3529 return ACC_plusOne;
3530
3531 default:
3532 // Otherwise, treat it as +0.
3533 return ACC_plusZero;
3534 }
3535 }
3536 };
3537} // end anonymous namespace
3538
3539bool Sema::isKnownName(StringRef name) {
3540 if (name.empty())
3541 return false;
3542 LookupResult R(*this, &Context.Idents.get(name), SourceLocation(),
3543 Sema::LookupOrdinaryName);
3544 return LookupName(R, TUScope, false);
3545}
3546
3547static void addFixitForObjCARCConversion(Sema &S,
3548 DiagnosticBuilder &DiagB,
3549 Sema::CheckedConversionKind CCK,
3550 SourceLocation afterLParen,
3551 QualType castType,
3552 Expr *castExpr,
3553 Expr *realCast,
3554 const char *bridgeKeyword,
3555 const char *CFBridgeName) {
3556 // We handle C-style and implicit casts here.
3557 switch (CCK) {
3558 case Sema::CCK_ImplicitConversion:
3559 case Sema::CCK_ForBuiltinOverloadedOp:
3560 case Sema::CCK_CStyleCast:
3561 case Sema::CCK_OtherCast:
3562 break;
3563 case Sema::CCK_FunctionalCast:
3564 return;
3565 }
3566
3567 if (CFBridgeName) {
3568 if (CCK == Sema::CCK_OtherCast) {
3569 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3570 SourceRange range(NCE->getOperatorLoc(),
3571 NCE->getAngleBrackets().getEnd());
3572 SmallString<32> BridgeCall;
3573
3574 SourceManager &SM = S.getSourceManager();
3575 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3576 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3577 BridgeCall += ' ';
3578
3579 BridgeCall += CFBridgeName;
3580 DiagB.AddFixItHint(FixItHint::CreateReplacement(range, BridgeCall));
3581 }
3582 return;
3583 }
3584 Expr *castedE = castExpr;
3585 if (CStyleCastExpr *CCE = dyn_cast<CStyleCastExpr>(castedE))
3586 castedE = CCE->getSubExpr();
3587 castedE = castedE->IgnoreImpCasts();
3588 SourceRange range = castedE->getSourceRange();
3589
3590 SmallString<32> BridgeCall;
3591
3592 SourceManager &SM = S.getSourceManager();
3593 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3594 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3595 BridgeCall += ' ';
3596
3597 BridgeCall += CFBridgeName;
3598
3599 if (isa<ParenExpr>(castedE)) {
3600 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3601 BridgeCall));
3602 } else {
3603 BridgeCall += '(';
3604 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3605 BridgeCall));
3606 DiagB.AddFixItHint(FixItHint::CreateInsertion(
3607 S.getLocForEndOfToken(range.getEnd()),
3608 ")"));
3609 }
3610 return;
3611 }
3612
3613 if (CCK == Sema::CCK_CStyleCast) {
3614 DiagB.AddFixItHint(FixItHint::CreateInsertion(afterLParen, bridgeKeyword));
3615 } else if (CCK == Sema::CCK_OtherCast) {
3616 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3617 std::string castCode = "(";
3618 castCode += bridgeKeyword;
3619 castCode += castType.getAsString();
3620 castCode += ")";
3621 SourceRange Range(NCE->getOperatorLoc(),
3622 NCE->getAngleBrackets().getEnd());
3623 DiagB.AddFixItHint(FixItHint::CreateReplacement(Range, castCode));
3624 }
3625 } else {
3626 std::string castCode = "(";
3627 castCode += bridgeKeyword;
3628 castCode += castType.getAsString();
3629 castCode += ")";
3630 Expr *castedE = castExpr->IgnoreImpCasts();
3631 SourceRange range = castedE->getSourceRange();
3632 if (isa<ParenExpr>(castedE)) {
3633 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3634 castCode));
3635 } else {
3636 castCode += "(";
3637 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3638 castCode));
3639 DiagB.AddFixItHint(FixItHint::CreateInsertion(
3640 S.getLocForEndOfToken(range.getEnd()),
3641 ")"));
3642 }
3643 }
3644}
3645
3646template <typename T>
3647static inline T *getObjCBridgeAttr(const TypedefType *TD) {
3648 TypedefNameDecl *TDNDecl = TD->getDecl();
3649 QualType QT = TDNDecl->getUnderlyingType();
3650 if (QT->isPointerType()) {
3651 QT = QT->getPointeeType();
3652 if (const RecordType *RT = QT->getAs<RecordType>())
3653 if (RecordDecl *RD = RT->getDecl()->getMostRecentDecl())
3654 return RD->getAttr<T>();
3655 }
3656 return nullptr;
3657}
3658
3659static ObjCBridgeRelatedAttr *ObjCBridgeRelatedAttrFromType(QualType T,
3660 TypedefNameDecl *&TDNDecl) {
3661 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3662 TDNDecl = TD->getDecl();
3663 if (ObjCBridgeRelatedAttr *ObjCBAttr =
3664 getObjCBridgeAttr<ObjCBridgeRelatedAttr>(TD))
3665 return ObjCBAttr;
3666 T = TDNDecl->getUnderlyingType();
3667 }
3668 return nullptr;
3669}
3670
3671static void
3672diagnoseObjCARCConversion(Sema &S, SourceRange castRange,
3673 QualType castType, ARCConversionTypeClass castACTC,
3674 Expr *castExpr, Expr *realCast,
3675 ARCConversionTypeClass exprACTC,
3676 Sema::CheckedConversionKind CCK) {
3677 SourceLocation loc =
3678 (castRange.isValid() ? castRange.getBegin() : castExpr->getExprLoc());
3679
3680 if (S.makeUnavailableInSystemHeader(loc,
3681 UnavailableAttr::IR_ARCForbiddenConversion))
3682 return;
3683
3684 QualType castExprType = castExpr->getType();
3685 // Defer emitting a diagnostic for bridge-related casts; that will be
3686 // handled by CheckObjCBridgeRelatedConversions.
3687 TypedefNameDecl *TDNDecl = nullptr;
3688 if ((castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable &&
3689 ObjCBridgeRelatedAttrFromType(castType, TDNDecl)) ||
3690 (exprACTC == ACTC_coreFoundation && castACTC == ACTC_retainable &&
3691 ObjCBridgeRelatedAttrFromType(castExprType, TDNDecl)))
3692 return;
3693
3694 unsigned srcKind = 0;
3695 switch (exprACTC) {
3696 case ACTC_none:
3697 case ACTC_coreFoundation:
3698 case ACTC_voidPtr:
3699 srcKind = (castExprType->isPointerType() ? 1 : 0);
3700 break;
3701 case ACTC_retainable:
3702 srcKind = (castExprType->isBlockPointerType() ? 2 : 3);
3703 break;
3704 case ACTC_indirectRetainable:
3705 srcKind = 4;
3706 break;
3707 }
3708
3709 // Check whether this could be fixed with a bridge cast.
3710 SourceLocation afterLParen = S.getLocForEndOfToken(castRange.getBegin());
3711 SourceLocation noteLoc = afterLParen.isValid() ? afterLParen : loc;
3712
3713 unsigned convKindForDiag = Sema::isCast(CCK) ? 0 : 1;
3714
3715 // Bridge from an ARC type to a CF type.
3716 if (castACTC == ACTC_retainable && isAnyRetainable(exprACTC)) {
3717
3718 S.Diag(loc, diag::err_arc_cast_requires_bridge)
3719 << convKindForDiag
3720 << 2 // of C pointer type
3721 << castExprType
3722 << unsigned(castType->isBlockPointerType()) // to ObjC|block type
3723 << castType
3724 << castRange
3725 << castExpr->getSourceRange();
3726 bool br = S.isKnownName("CFBridgingRelease");
3727 ACCResult CreateRule =
3728 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3729 assert(CreateRule != ACC_bottom && "This cast should already be accepted.")(__builtin_expect(!(CreateRule != ACC_bottom && "This cast should already be accepted."
), 0) ? __assert_rtn(__func__, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 3729, "CreateRule != ACC_bottom && \"This cast should already be accepted.\""
) : (void)0)
;
3730 if (CreateRule != ACC_plusOne)
3731 {
3732 DiagnosticBuilder DiagB =
3733 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3734 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3735
3736 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3737 castType, castExpr, realCast, "__bridge ",
3738 nullptr);
3739 }
3740 if (CreateRule != ACC_plusZero)
3741 {
3742 DiagnosticBuilder DiagB =
3743 (CCK == Sema::CCK_OtherCast && !br) ?
3744 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_transfer) << castExprType :
3745 S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3746 diag::note_arc_bridge_transfer)
3747 << castExprType << br;
3748
3749 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3750 castType, castExpr, realCast, "__bridge_transfer ",
3751 br ? "CFBridgingRelease" : nullptr);
3752 }
3753
3754 return;
3755 }
3756
3757 // Bridge from a CF type to an ARC type.
3758 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC)) {
3759 bool br = S.isKnownName("CFBridgingRetain");
3760 S.Diag(loc, diag::err_arc_cast_requires_bridge)
3761 << convKindForDiag
3762 << unsigned(castExprType->isBlockPointerType()) // of ObjC|block type
3763 << castExprType
3764 << 2 // to C pointer type
3765 << castType
3766 << castRange
3767 << castExpr->getSourceRange();
3768 ACCResult CreateRule =
3769 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3770 assert(CreateRule != ACC_bottom && "This cast should already be accepted.")(__builtin_expect(!(CreateRule != ACC_bottom && "This cast should already be accepted."
), 0) ? __assert_rtn(__func__, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 3770, "CreateRule != ACC_bottom && \"This cast should already be accepted.\""
) : (void)0)
;
3771 if (CreateRule != ACC_plusOne)
3772 {
3773 DiagnosticBuilder DiagB =
3774 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3775 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3776 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3777 castType, castExpr, realCast, "__bridge ",
3778 nullptr);
3779 }
3780 if (CreateRule != ACC_plusZero)
3781 {
3782 DiagnosticBuilder DiagB =
3783 (CCK == Sema::CCK_OtherCast && !br) ?
3784 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_retained) << castType :
3785 S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3786 diag::note_arc_bridge_retained)
3787 << castType << br;
3788
3789 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3790 castType, castExpr, realCast, "__bridge_retained ",
3791 br ? "CFBridgingRetain" : nullptr);
3792 }
3793
3794 return;
3795 }
3796
3797 S.Diag(loc, diag::err_arc_mismatched_cast)
3798 << !convKindForDiag
3799 << srcKind << castExprType << castType
3800 << castRange << castExpr->getSourceRange();
3801}
3802
3803template <typename TB>
3804static bool CheckObjCBridgeNSCast(Sema &S, QualType castType, Expr *castExpr,
3805 bool &HadTheAttribute, bool warn) {
3806 QualType T = castExpr->getType();
3807 HadTheAttribute = false;
3808 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3809 TypedefNameDecl *TDNDecl = TD->getDecl();
3810 if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3811 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3812 HadTheAttribute = true;
3813 if (Parm->isStr("id"))
3814 return true;
3815
3816 NamedDecl *Target = nullptr;
3817 // Check for an existing type with this name.
3818 LookupResult R(S, DeclarationName(Parm), SourceLocation(),
3819 Sema::LookupOrdinaryName);
3820 if (S.LookupName(R, S.TUScope)) {
3821 Target = R.getFoundDecl();
3822 if (Target && isa<ObjCInterfaceDecl>(Target)) {
3823 ObjCInterfaceDecl *ExprClass = cast<ObjCInterfaceDecl>(Target);
3824 if (const ObjCObjectPointerType *InterfacePointerType =
3825 castType->getAsObjCInterfacePointerType()) {
3826 ObjCInterfaceDecl *CastClass
3827 = InterfacePointerType->getObjectType()->getInterface();
3828 if ((CastClass == ExprClass) ||
3829 (CastClass && CastClass->isSuperClassOf(ExprClass)))
3830 return true;
3831 if (warn)
3832 S.Diag(castExpr->getBeginLoc(), diag::warn_objc_invalid_bridge)
3833 << T << Target->getName() << castType->getPointeeType();
3834 return false;
3835 } else if (castType->isObjCIdType() ||
3836 (S.Context.ObjCObjectAdoptsQTypeProtocols(
3837 castType, ExprClass)))
3838 // ok to cast to 'id'.
3839 // casting to id<p-list> is ok if bridge type adopts all of
3840 // p-list protocols.
3841 return true;
3842 else {
3843 if (warn) {
3844 S.Diag(castExpr->getBeginLoc(), diag::warn_objc_invalid_bridge)
3845 << T << Target->getName() << castType;
3846 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3847 S.Diag(Target->getBeginLoc(), diag::note_declared_at);
3848 }
3849 return false;
3850 }
3851 }
3852 } else if (!castType->isObjCIdType()) {
3853 S.Diag(castExpr->getBeginLoc(),
3854 diag::err_objc_cf_bridged_not_interface)
3855 << castExpr->getType() << Parm;
3856 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3857 if (Target)
3858 S.Diag(Target->getBeginLoc(), diag::note_declared_at);
3859 }
3860 return true;
3861 }
3862 return false;
3863 }
3864 T = TDNDecl->getUnderlyingType();
3865 }
3866 return true;
3867}
3868
3869template <typename TB>
3870static bool CheckObjCBridgeCFCast(Sema &S, QualType castType, Expr *castExpr,
3871 bool &HadTheAttribute, bool warn) {
3872 QualType T = castType;
3873 HadTheAttribute = false;
3874 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3875 TypedefNameDecl *TDNDecl = TD->getDecl();
3876 if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3877 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3878 HadTheAttribute = true;
3879 if (Parm->isStr("id"))
3880 return true;
3881
3882 NamedDecl *Target = nullptr;
3883 // Check for an existing type with this name.
3884 LookupResult R(S, DeclarationName(Parm), SourceLocation(),
3885 Sema::LookupOrdinaryName);
3886 if (S.LookupName(R, S.TUScope)) {
3887 Target = R.getFoundDecl();
3888 if (Target && isa<ObjCInterfaceDecl>(Target)) {
3889 ObjCInterfaceDecl *CastClass = cast<ObjCInterfaceDecl>(Target);
3890 if (const ObjCObjectPointerType *InterfacePointerType =
3891 castExpr->getType()->getAsObjCInterfacePointerType()) {
3892 ObjCInterfaceDecl *ExprClass
3893 = InterfacePointerType->getObjectType()->getInterface();
3894 if ((CastClass == ExprClass) ||
3895 (ExprClass && CastClass->isSuperClassOf(ExprClass)))
3896 return true;
3897 if (warn) {
3898 S.Diag(castExpr->getBeginLoc(),
3899 diag::warn_objc_invalid_bridge_to_cf)
3900 << castExpr->getType()->getPointeeType() << T;
3901 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3902 }
3903 return false;
3904 } else if (castExpr->getType()->isObjCIdType() ||
3905 (S.Context.QIdProtocolsAdoptObjCObjectProtocols(
3906 castExpr->getType(), CastClass)))
3907 // ok to cast an 'id' expression to a CFtype.
3908 // ok to cast an 'id<plist>' expression to CFtype provided plist
3909 // adopts all of CFtype's ObjetiveC's class plist.
3910 return true;
3911 else {
3912 if (warn) {
3913 S.Diag(castExpr->getBeginLoc(),
3914 diag::warn_objc_invalid_bridge_to_cf)
3915 << castExpr->getType() << castType;
3916 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3917 S.Diag(Target->getBeginLoc(), diag::note_declared_at);
3918 }
3919 return false;
3920 }
3921 }
3922 }
3923 S.Diag(castExpr->getBeginLoc(),
3924 diag::err_objc_ns_bridged_invalid_cfobject)
3925 << castExpr->getType() << castType;
3926 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3927 if (Target)
3928 S.Diag(Target->getBeginLoc(), diag::note_declared_at);
3929 return true;
3930 }
3931 return false;
3932 }
3933 T = TDNDecl->getUnderlyingType();
3934 }
3935 return true;
3936}
3937
3938void Sema::CheckTollFreeBridgeCast(QualType castType, Expr *castExpr) {
3939 if (!getLangOpts().ObjC)
3940 return;
3941 // warn in presence of __bridge casting to or from a toll free bridge cast.
3942 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExpr->getType());
3943 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType);
3944 if (castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) {
3945 bool HasObjCBridgeAttr;
3946 bool ObjCBridgeAttrWillNotWarn =
3947 CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3948 false);
3949 if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
3950 return;
3951 bool HasObjCBridgeMutableAttr;
3952 bool ObjCBridgeMutableAttrWillNotWarn =
3953 CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3954 HasObjCBridgeMutableAttr, false);
3955 if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
3956 return;
3957
3958 if (HasObjCBridgeAttr)
3959 CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3960 true);
3961 else if (HasObjCBridgeMutableAttr)
3962 CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3963 HasObjCBridgeMutableAttr, true);
3964 }
3965 else if (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable) {
3966 bool HasObjCBridgeAttr;
3967 bool ObjCBridgeAttrWillNotWarn =
3968 CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3969 false);
3970 if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
3971 return;
3972 bool HasObjCBridgeMutableAttr;
3973 bool ObjCBridgeMutableAttrWillNotWarn =
3974 CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3975 HasObjCBridgeMutableAttr, false);
3976 if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
3977 return;
3978
3979 if (HasObjCBridgeAttr)
3980 CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3981 true);
3982 else if (HasObjCBridgeMutableAttr)
3983 CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3984 HasObjCBridgeMutableAttr, true);
3985 }
3986}
3987
3988void Sema::CheckObjCBridgeRelatedCast(QualType castType, Expr *castExpr) {
3989 QualType SrcType = castExpr->getType();
3990 if (ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(castExpr)) {
3991 if (PRE->isExplicitProperty()) {
3992 if (ObjCPropertyDecl *PDecl = PRE->getExplicitProperty())
3993 SrcType = PDecl->getType();
3994 }
3995 else if (PRE->isImplicitProperty()) {
3996 if (ObjCMethodDecl *Getter = PRE->getImplicitPropertyGetter())
3997 SrcType = Getter->getReturnType();
3998 }
3999 }
4000
4001 ARCConversionTypeClass srcExprACTC = classifyTypeForARCConversion(SrcType);
4002 ARCConversionTypeClass castExprACTC = classifyTypeForARCConversion(castType);
4003 if (srcExprACTC != ACTC_retainable || castExprACTC != ACTC_coreFoundation)
4004 return;
4005 CheckObjCBridgeRelatedConversions(castExpr->getBeginLoc(), castType, SrcType,
4006 castExpr);
4007}
4008
4009bool Sema::CheckTollFreeBridgeStaticCast(QualType castType, Expr *castExpr,
4010 CastKind &Kind) {
4011 if (!getLangOpts().ObjC)
4012 return false;
4013 ARCConversionTypeClass exprACTC =
4014 classifyTypeForARCConversion(castExpr->getType());
4015 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType);
4016 if ((castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) ||
4017 (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable)) {
4018 CheckTollFreeBridgeCast(castType, castExpr);
4019 Kind = (castACTC == ACTC_coreFoundation) ? CK_BitCast
4020 : CK_CPointerToObjCPointerCast;
4021 return true;
4022 }
4023 return false;
4024}
4025
4026bool Sema::checkObjCBridgeRelatedComponents(SourceLocation Loc,
4027 QualType DestType, QualType SrcType,
4028 ObjCInterfaceDecl *&RelatedClass,
4029 ObjCMethodDecl *&ClassMethod,
4030 ObjCMethodDecl *&InstanceMethod,
4031 TypedefNameDecl *&TDNDecl,
4032 bool CfToNs, bool Diagnose) {
4033 QualType T = CfToNs ? SrcType : DestType;
4034 ObjCBridgeRelatedAttr *ObjCBAttr = ObjCBridgeRelatedAttrFromType(T, TDNDecl);
4035 if (!ObjCBAttr)
4036 return false;
4037
4038 IdentifierInfo *RCId = ObjCBAttr->getRelatedClass();
4039 IdentifierInfo *CMId = ObjCBAttr->getClassMethod();
4040 IdentifierInfo *IMId = ObjCBAttr->getInstanceMethod();
4041 if (!RCId)
4042 return false;
4043 NamedDecl *Target = nullptr;
4044 // Check for an existing type with this name.
4045 LookupResult R(*this, DeclarationName(RCId), SourceLocation(),
4046 Sema::LookupOrdinaryName);
4047 if (!LookupName(R, TUScope)) {
4048 if (Diagnose) {
4049 Diag(Loc, diag::err_objc_bridged_related_invalid_class) << RCId
4050 << SrcType << DestType;
4051 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4052 }
4053 return false;
4054 }
4055 Target = R.getFoundDecl();
4056 if (Target && isa<ObjCInterfaceDecl>(Target))
4057 RelatedClass = cast<ObjCInterfaceDecl>(Target);
4058 else {
4059 if (Diagnose) {
4060 Diag(Loc, diag::err_objc_bridged_related_invalid_class_name) << RCId
4061 << SrcType << DestType;
4062 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4063 if (Target)
4064 Diag(Target->getBeginLoc(), diag::note_declared_at);
4065 }
4066 return false;
4067 }
4068
4069 // Check for an existing class method with the given selector name.
4070 if (CfToNs && CMId) {
4071 Selector Sel = Context.Selectors.getUnarySelector(CMId);
4072 ClassMethod = RelatedClass->lookupMethod(Sel, false);
4073 if (!ClassMethod) {
4074 if (Diagnose) {
4075 Diag(Loc, diag::err_objc_bridged_related_known_method)
4076 << SrcType << DestType << Sel << false;
4077 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4078 }
4079 return false;
4080 }
4081 }
4082
4083 // Check for an existing instance method with the given selector name.
4084 if (!CfToNs && IMId) {
4085 Selector Sel = Context.Selectors.getNullarySelector(IMId);
4086 InstanceMethod = RelatedClass->lookupMethod(Sel, true);
4087 if (!InstanceMethod) {
4088 if (Diagnose) {
4089 Diag(Loc, diag::err_objc_bridged_related_known_method)
4090 << SrcType << DestType << Sel << true;
4091 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4092 }
4093 return false;
4094 }
4095 }
4096 return true;
4097}
4098
4099bool
4100Sema::CheckObjCBridgeRelatedConversions(SourceLocation Loc,
4101 QualType DestType, QualType SrcType,
4102 Expr *&SrcExpr, bool Diagnose) {
4103 ARCConversionTypeClass rhsExprACTC = classifyTypeForARCConversion(SrcType);
4104 ARCConversionTypeClass lhsExprACTC = classifyTypeForARCConversion(DestType);
4105 bool CfToNs = (rhsExprACTC == ACTC_coreFoundation && lhsExprACTC == ACTC_retainable);
4106 bool NsToCf = (rhsExprACTC == ACTC_retainable && lhsExprACTC == ACTC_coreFoundation);
4107 if (!CfToNs && !NsToCf)
4108 return false;
4109
4110 ObjCInterfaceDecl *RelatedClass;
4111 ObjCMethodDecl *ClassMethod = nullptr;
4112 ObjCMethodDecl *InstanceMethod = nullptr;
4113 TypedefNameDecl *TDNDecl = nullptr;
4114 if (!checkObjCBridgeRelatedComponents(Loc, DestType, SrcType, RelatedClass,
4115 ClassMethod, InstanceMethod, TDNDecl,
4116 CfToNs, Diagnose))
4117 return false;
4118
4119 if (CfToNs) {
4120 // Implicit conversion from CF to ObjC object is needed.
4121 if (ClassMethod) {
4122 if (Diagnose) {
4123 std::string ExpressionString = "[";
4124 ExpressionString += RelatedClass->getNameAsString();
4125 ExpressionString += " ";
4126 ExpressionString += ClassMethod->getSelector().getAsString();
4127 SourceLocation SrcExprEndLoc =
4128 getLocForEndOfToken(SrcExpr->getEndLoc());
4129 // Provide a fixit: [RelatedClass ClassMethod SrcExpr]
4130 Diag(Loc, diag::err_objc_bridged_related_known_method)
4131 << SrcType << DestType << ClassMethod->getSelector() << false
4132 << FixItHint::CreateInsertion(SrcExpr->getBeginLoc(),
4133 ExpressionString)
4134 << FixItHint::CreateInsertion(SrcExprEndLoc, "]");
4135 Diag(RelatedClass->getBeginLoc(), diag::note_declared_at);
4136 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4137
4138 QualType receiverType = Context.getObjCInterfaceType(RelatedClass);
4139 // Argument.
4140 Expr *args[] = { SrcExpr };
4141 ExprResult msg = BuildClassMessageImplicit(receiverType, false,
4142 ClassMethod->getLocation(),
4143 ClassMethod->getSelector(), ClassMethod,
4144 MultiExprArg(args, 1));
4145 SrcExpr = msg.get();
4146 }
4147 return true;
4148 }
4149 }
4150 else {
4151 // Implicit conversion from ObjC type to CF object is needed.
4152 if (InstanceMethod) {
4153 if (Diagnose) {
4154 std::string ExpressionString;
4155 SourceLocation SrcExprEndLoc =
4156 getLocForEndOfToken(SrcExpr->getEndLoc());
4157 if (InstanceMethod->isPropertyAccessor())
4158 if (const ObjCPropertyDecl *PDecl =
4159 InstanceMethod->findPropertyDecl()) {
4160 // fixit: ObjectExpr.propertyname when it is aproperty accessor.
4161 ExpressionString = ".";
4162 ExpressionString += PDecl->getNameAsString();
4163 Diag(Loc, diag::err_objc_bridged_related_known_method)
4164 << SrcType << DestType << InstanceMethod->getSelector() << true
4165 << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
4166 }
4167 if (ExpressionString.empty()) {
4168 // Provide a fixit: [ObjectExpr InstanceMethod]
4169 ExpressionString = " ";
4170 ExpressionString += InstanceMethod->getSelector().getAsString();
4171 ExpressionString += "]";
4172
4173 Diag(Loc, diag::err_objc_bridged_related_known_method)
4174 << SrcType << DestType << InstanceMethod->getSelector() << true
4175 << FixItHint::CreateInsertion(SrcExpr->getBeginLoc(), "[")
4176 << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
4177 }
4178 Diag(RelatedClass->getBeginLoc(), diag::note_declared_at);
4179 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4180
4181 ExprResult msg =
4182 BuildInstanceMessageImplicit(SrcExpr, SrcType,
4183 InstanceMethod->getLocation(),
4184 InstanceMethod->getSelector(),
4185 InstanceMethod, None);
4186 SrcExpr = msg.get();
4187 }
4188 return true;
4189 }
4190 }
4191 return false;
4192}
4193
4194Sema::ARCConversionResult
4195Sema::CheckObjCConversion(SourceRange castRange, QualType castType,
4196 Expr *&castExpr, CheckedConversionKind CCK,
4197 bool Diagnose, bool DiagnoseCFAudited,
4198 BinaryOperatorKind Opc) {
4199 QualType castExprType = castExpr->getType();
4200
4201 // For the purposes of the classification, we assume reference types
4202 // will bind to temporaries.
4203 QualType effCastType = castType;
4204 if (const ReferenceType *ref = castType->getAs<ReferenceType>())
4205 effCastType = ref->getPointeeType();
4206
4207 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExprType);
4208 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(effCastType);
4209 if (exprACTC == castACTC) {
4210 // Check for viability and report error if casting an rvalue to a
4211 // life-time qualifier.
4212 if (castACTC == ACTC_retainable &&
4213 (CCK == CCK_CStyleCast || CCK == CCK_OtherCast) &&
4214 castType != castExprType) {
4215 const Type *DT = castType.getTypePtr();
4216 QualType QDT = castType;
4217 // We desugar some types but not others. We ignore those
4218 // that cannot happen in a cast; i.e. auto, and those which
4219 // should not be de-sugared; i.e typedef.
4220 if (const ParenType *PT = dyn_cast<ParenType>(DT))
4221 QDT = PT->desugar();
4222 else if (const TypeOfType *TP = dyn_cast<TypeOfType>(DT))
4223 QDT = TP->desugar();
4224 else if (const AttributedType *AT = dyn_cast<AttributedType>(DT))
4225 QDT = AT->desugar();
4226 if (QDT != castType &&
4227 QDT.getObjCLifetime() != Qualifiers::OCL_None) {
4228 if (Diagnose) {
4229 SourceLocation loc = (castRange.isValid() ? castRange.getBegin()
4230 : castExpr->getExprLoc());
4231 Diag(loc, diag::err_arc_nolifetime_behavior);
4232 }
4233 return ACR_error;
4234 }
4235 }
4236 return ACR_okay;
4237 }
4238
4239 // The life-time qualifier cast check above is all we need for ObjCWeak.
4240 // ObjCAutoRefCount has more restrictions on what is legal.
4241 if (!getLangOpts().ObjCAutoRefCount)
4242 return ACR_okay;
4243
4244 if (isAnyCLike(exprACTC) && isAnyCLike(castACTC)) return ACR_okay;
4245
4246 // Allow all of these types to be cast to integer types (but not
4247 // vice-versa).
4248 if (castACTC == ACTC_none && castType->isIntegralType(Context))
4249 return ACR_okay;
4250
4251 // Allow casts between pointers to lifetime types (e.g., __strong id*)
4252 // and pointers to void (e.g., cv void *). Casting from void* to lifetime*
4253 // must be explicit.
4254 if (exprACTC == ACTC_indirectRetainable && castACTC == ACTC_voidPtr)
4255 return ACR_okay;
4256 if (castACTC == ACTC_indirectRetainable && exprACTC == ACTC_voidPtr &&
4257 isCast(CCK))
4258 return ACR_okay;
4259
4260 switch (ARCCastChecker(Context, exprACTC, castACTC, false).Visit(castExpr)) {
4261 // For invalid casts, fall through.
4262 case ACC_invalid:
4263 break;
4264
4265 // Do nothing for both bottom and +0.
4266 case ACC_bottom:
4267 case ACC_plusZero:
4268 return ACR_okay;
4269
4270 // If the result is +1, consume it here.
4271 case ACC_plusOne:
4272 castExpr = ImplicitCastExpr::Create(Context, castExpr->getType(),
4273 CK_ARCConsumeObject, castExpr,
4274 nullptr, VK_RValue);
4275 Cleanup.setExprNeedsCleanups(true);
4276 return ACR_okay;
4277 }
4278
4279 // If this is a non-implicit cast from id or block type to a
4280 // CoreFoundation type, delay complaining in case the cast is used
4281 // in an acceptable context.
4282 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC) && isCast(CCK))
4283 return ACR_unbridged;
4284
4285 // Issue a diagnostic about a missing @-sign when implicit casting a cstring
4286 // to 'NSString *', instead of falling through to report a "bridge cast"
4287 // diagnostic.
4288 if (castACTC == ACTC_retainable && exprACTC == ACTC_none &&
4289 ConversionToObjCStringLiteralCheck(castType, castExpr, Diagnose))
4290 return ACR_error;
4291
4292 // Do not issue "bridge cast" diagnostic when implicit casting
4293 // a retainable object to a CF type parameter belonging to an audited
4294 // CF API function. Let caller issue a normal type mismatched diagnostic
4295 // instead.
4296 if ((!DiagnoseCFAudited || exprACTC != ACTC_retainable ||
4297 castACTC != ACTC_coreFoundation) &&
4298 !(exprACTC == ACTC_voidPtr && castACTC == ACTC_retainable &&
4299 (Opc == BO_NE || Opc == BO_EQ))) {
4300 if (Diagnose)
4301 diagnoseObjCARCConversion(*this, castRange, castType, castACTC, castExpr,
4302 castExpr, exprACTC, CCK);
4303 return ACR_error;
4304 }
4305 return ACR_okay;
4306}
4307
4308/// Given that we saw an expression with the ARCUnbridgedCastTy
4309/// placeholder type, complain bitterly.
4310void Sema::diagnoseARCUnbridgedCast(Expr *e) {
4311 // We expect the spurious ImplicitCastExpr to already have been stripped.
4312 assert(!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast))(__builtin_expect(!(!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast
)), 0) ? __assert_rtn(__func__, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4312, "!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast)"
) : (void)0)
;
4313 CastExpr *realCast = cast<CastExpr>(e->IgnoreParens());
4314
4315 SourceRange castRange;
4316 QualType castType;
4317 CheckedConversionKind CCK;
4318
4319 if (CStyleCastExpr *cast = dyn_cast<CStyleCastExpr>(realCast)) {
4320 castRange = SourceRange(cast->getLParenLoc(), cast->getRParenLoc());
4321 castType = cast->getTypeAsWritten();
4322 CCK = CCK_CStyleCast;
4323 } else if (ExplicitCastExpr *cast = dyn_cast<ExplicitCastExpr>(realCast)) {
4324 castRange = cast->getTypeInfoAsWritten()->getTypeLoc().getSourceRange();
4325 castType = cast->getTypeAsWritten();
4326 CCK = CCK_OtherCast;
4327 } else {
4328 llvm_unreachable("Unexpected ImplicitCastExpr")::llvm::llvm_unreachable_internal("Unexpected ImplicitCastExpr"
, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4328)
;
4329 }
4330
4331 ARCConversionTypeClass castACTC =
4332 classifyTypeForARCConversion(castType.getNonReferenceType());
4333
4334 Expr *castExpr = realCast->getSubExpr();
4335 assert(classifyTypeForARCConversion(castExpr->getType()) == ACTC_retainable)(__builtin_expect(!(classifyTypeForARCConversion(castExpr->
getType()) == ACTC_retainable), 0) ? __assert_rtn(__func__, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4335, "classifyTypeForARCConversion(castExpr->getType()) == ACTC_retainable"
) : (void)0)
;
4336
4337 diagnoseObjCARCConversion(*this, castRange, castType, castACTC,
4338 castExpr, realCast, ACTC_retainable, CCK);
4339}
4340
4341/// stripARCUnbridgedCast - Given an expression of ARCUnbridgedCast
4342/// type, remove the placeholder cast.
4343Expr *Sema::stripARCUnbridgedCast(Expr *e) {
4344 assert(e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast))(__builtin_expect(!(e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast
)), 0) ? __assert_rtn(__func__, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4344, "e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast)"
) : (void)0)
;
4345
4346 if (ParenExpr *pe = dyn_cast<ParenExpr>(e)) {
4347 Expr *sub = stripARCUnbridgedCast(pe->getSubExpr());
4348 return new (Context) ParenExpr(pe->getLParen(), pe->getRParen(), sub);
4349 } else if (UnaryOperator *uo = dyn_cast<UnaryOperator>(e)) {
4350 assert(uo->getOpcode() == UO_Extension)(__builtin_expect(!(uo->getOpcode() == UO_Extension), 0) ?
__assert_rtn(__func__, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4350, "uo->getOpcode() == UO_Extension") : (void)0)
;
4351 Expr *sub = stripARCUnbridgedCast(uo->getSubExpr());
4352 return new (Context)
4353 UnaryOperator(sub, UO_Extension, sub->getType(), sub->getValueKind(),
4354 sub->getObjectKind(), uo->getOperatorLoc(), false);
4355 } else if (GenericSelectionExpr *gse = dyn_cast<GenericSelectionExpr>(e)) {
4356 assert(!gse->isResultDependent())(__builtin_expect(!(!gse->isResultDependent()), 0) ? __assert_rtn
(__func__, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4356, "!gse->isResultDependent()") : (void)0)
;
4357
4358 unsigned n = gse->getNumAssocs();
4359 SmallVector<Expr *, 4> subExprs;
4360 SmallVector<TypeSourceInfo *, 4> subTypes;
4361 subExprs.reserve(n);
4362 subTypes.reserve(n);
4363 for (const GenericSelectionExpr::Association &assoc : gse->associations()) {
4364 subTypes.push_back(assoc.getTypeSourceInfo());
4365 Expr *sub = assoc.getAssociationExpr();
4366 if (assoc.isSelected())
4367 sub = stripARCUnbridgedCast(sub);
4368 subExprs.push_back(sub);
4369 }
4370
4371 return GenericSelectionExpr::Create(
4372 Context, gse->getGenericLoc(), gse->getControllingExpr(), subTypes,
4373 subExprs, gse->getDefaultLoc(), gse->getRParenLoc(),
4374 gse->containsUnexpandedParameterPack(), gse->getResultIndex());
4375 } else {
4376 assert(isa<ImplicitCastExpr>(e) && "bad form of unbridged cast!")(__builtin_expect(!(isa<ImplicitCastExpr>(e) &&
"bad form of unbridged cast!"), 0) ? __assert_rtn(__func__, "/Users/adergachev/svn/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4376, "isa<ImplicitCastExpr>(e) && \"bad form of unbridged cast!\""
) : (void)0)
;
4377 return cast<ImplicitCastExpr>(e)->getSubExpr();
4378 }
4379}
4380
4381bool Sema::CheckObjCARCUnavailableWeakConversion(QualType castType,
4382 QualType exprType) {
4383 QualType canCastType =
4384 Context.getCanonicalType(castType).getUnqualifiedType();
4385 QualType canExprType =
4386 Context.getCanonicalType(exprType).getUnqualifiedType();
4387 if (isa<ObjCObjectPointerType>(canCastType) &&
4388 castType.getObjCLifetime() == Qualifiers::OCL_Weak &&
4389 canExprType->isObjCObjectPointerType()) {
4390 if (const ObjCObjectPointerType *ObjT =
4391 canExprType->getAs<ObjCObjectPointerType>())
4392 if (const ObjCInterfaceDecl *ObjI = ObjT->getInterfaceDecl())
4393 return !ObjI->isArcWeakrefUnavailable();
4394 }
4395 return true;
4396}
4397
4398/// Look for an ObjCReclaimReturnedObject cast and destroy it.
4399static Expr *maybeUndoReclaimObject(Expr *e) {
4400 Expr *curExpr = e, *prevExpr = nullptr;
4401
4402 // Walk down the expression until we hit an implicit cast of kind
4403 // ARCReclaimReturnedObject or an Expr that is neither a Paren nor a Cast.
4404 while (true) {
4405 if (auto *pe = dyn_cast<ParenExpr>(curExpr)) {
4406 prevExpr = curExpr;
4407 curExpr = pe->getSubExpr();
4408 continue;
4409 }
4410
4411 if (auto *ce = dyn_cast<CastExpr>(curExpr)) {
4412 if (auto *ice = dyn_cast<ImplicitCastExpr>(ce))
4413 if (ice->getCastKind() == CK_ARCReclaimReturnedObject) {
4414 if (!prevExpr)
4415 return ice->getSubExpr();
4416 if (auto *pe = dyn_cast<ParenExpr>(prevExpr))
4417 pe->setSubExpr(ice->getSubExpr());
4418 else
4419 cast<CastExpr>(prevExpr)->setSubExpr(ice->getSubExpr());
4420 return e;
4421 }
4422
4423 prevExpr = curExpr;
4424 curExpr = ce->getSubExpr();
4425 continue;
4426 }
4427
4428 // Break out of the loop if curExpr is neither a Paren nor a Cast.
4429 break;
4430 }
4431
4432 return e;
4433}
4434
4435ExprResult Sema::BuildObjCBridgedCast(SourceLocation LParenLoc,
4436 ObjCBridgeCastKind Kind,
4437 SourceLocation BridgeKeywordLoc,
4438 TypeSourceInfo *TSInfo,
4439 Expr *SubExpr) {
4440 ExprResult SubResult = UsualUnaryConversions(SubExpr);
4441 if (SubResult.isInvalid()) return ExprError();
4442 SubExpr = SubResult.get();
4443
4444 QualType T = TSInfo->getType();
4445 QualType FromType = SubExpr->getType();
4446
4447 CastKind CK;
4448
4449 bool MustConsume = false;
4450 if (T->isDependentType() || SubExpr->isTypeDependent()) {
4451 // Okay: we'll build a dependent expression type.
4452 CK = CK_Dependent;
4453 } else if (T->isObjCARCBridgableType() && FromType->isCARCBridgableType()) {
4454 // Casting CF -> id
4455 CK = (T->isBlockPointerType() ? CK_AnyPointerToBlockPointerCast
4456 : CK_CPointerToObjCPointerCast);
4457 switch (Kind) {
4458 case OBC_Bridge:
4459 break;
4460
4461 case OBC_BridgeRetained: {
4462 bool br = isKnownName("CFBridgingRelease");
4463 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4464 << 2
4465 << FromType
4466 << (T->isBlockPointerType()? 1 : 0)
4467 << T
4468 << SubExpr->getSourceRange()
4469 << Kind;
4470 Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4471 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge");
4472 Diag(BridgeKeywordLoc, diag::note_arc_bridge_transfer)
4473 << FromType << br
4474 << FixItHint::CreateReplacement(BridgeKeywordLoc,
4475 br ? "CFBridgingRelease "
4476 : "__bridge_transfer ");
4477
4478 Kind = OBC_Bridge;
4479 break;
4480 }
4481
4482 case OBC_BridgeTransfer:
4483 // We must consume the Objective-C object produced by the cast.
4484 MustConsume = true;
4485 break;
4486 }
4487 } else if (T->isCARCBridgableType() && FromType->isObjCARCBridgableType()) {
4488 // Okay: id -> CF
4489 CK = CK_BitCast;
4490 switch (Kind) {
4491 case OBC_Bridge:
4492 // Reclaiming a value that's going to be __bridge-casted to CF
4493 // is very dangerous, so we don't do it.
4494 SubExpr = maybeUndoReclaimObject(SubExpr);
4495 break;
4496
4497 case OBC_BridgeRetained:
4498 // Produce the object before casting it.
4499 SubExpr = ImplicitCastExpr::Create(Context, FromType,
4500 CK_ARCProduceObject,
4501 SubExpr, nullptr, VK_RValue);
4502 break;
4503
4504 case OBC_BridgeTransfer: {
4505 bool br = isKnownName("CFBridgingRetain");
4506 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4507 << (FromType->isBlockPointerType()? 1 : 0)
4508 << FromType
4509 << 2
4510 << T
4511 << SubExpr->getSourceRange()
4512 << Kind;
4513
4514 Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4515 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge ");
4516 Diag(BridgeKeywordLoc, diag::note_arc_bridge_retained)
4517 << T << br
4518 << FixItHint::CreateReplacement(BridgeKeywordLoc,
4519 br ? "CFBridgingRetain " : "__bridge_retained");
4520
4521 Kind = OBC_Bridge;
4522 break;
4523 }
4524 }
4525 } else {
4526 Diag(LParenLoc, diag::err_arc_bridge_cast_incompatible)
4527 << FromType << T << Kind
4528 << SubExpr->getSourceRange()
4529 << TSInfo->getTypeLoc().getSourceRange();
4530 return ExprError();
4531 }
4532
4533 Expr *Result = new (Context) ObjCBridgedCastExpr(LParenLoc, Kind, CK,
4534 BridgeKeywordLoc,
4535 TSInfo, SubExpr);
4536
4537 if (MustConsume) {
4538 Cleanup.setExprNeedsCleanups(true);
4539 Result = ImplicitCastExpr::Create(Context, T, CK_ARCConsumeObject, Result,
4540 nullptr, VK_RValue);
4541 }
4542
4543 return Result;
4544}
4545
4546ExprResult Sema::ActOnObjCBridgedCast(Scope *S,
4547 SourceLocation LParenLoc,
4548 ObjCBridgeCastKind Kind,
4549 SourceLocation BridgeKeywordLoc,
4550 ParsedType Type,
4551 SourceLocation RParenLoc,
4552 Expr *SubExpr) {
4553 TypeSourceInfo *TSInfo = nullptr;
4554 QualType T = GetTypeFromParser(Type, &TSInfo);
4555 if (Kind == OBC_Bridge)
4556 CheckTollFreeBridgeCast(T, SubExpr);
4557 if (!TSInfo)
4558 TSInfo = Context.getTrivialTypeSourceInfo(T, LParenLoc);
4559 return BuildObjCBridgedCast(LParenLoc, Kind, BridgeKeywordLoc, TSInfo,
4560 SubExpr);
4561}