Bug Summary

File:tools/clang/lib/Sema/SemaExprObjC.cpp
Warning:line 2405, column 7
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name SemaExprObjC.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-eagerly-assume -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -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 -relaxed-aliasing -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-7/lib/clang/7.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-7~svn337490/build-llvm/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-7~svn337490/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-7~svn337490/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn337490/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn337490/build-llvm/include -I /build/llvm-toolchain-snapshot-7~svn337490/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/8/../../../../include/x86_64-linux-gnu/c++/8 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/8/../../../../include/x86_64-linux-gnu/c++/8 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8/backward -internal-isystem /usr/include/clang/7.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-7/lib/clang/7.0.0/include -internal-externc-isystem /usr/lib/gcc/x86_64-linux-gnu/8/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++11 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-7~svn337490/build-llvm/tools/clang/lib/Sema -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2018-07-20-043646-20380-1 -x c++ /build/llvm-toolchain-snapshot-7~svn337490/tools/clang/lib/Sema/SemaExprObjC.cpp -faddrsig
1//===--- SemaExprObjC.cpp - Semantic Analysis for ObjC Expressions --------===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file implements semantic analysis for Objective-C expressions.
11//
12//===----------------------------------------------------------------------===//
13
14#include "clang/Sema/SemaInternal.h"
15#include "clang/AST/ASTContext.h"
16#include "clang/AST/DeclObjC.h"
17#include "clang/AST/ExprObjC.h"
18#include "clang/AST/StmtVisitor.h"
19#include "clang/AST/TypeLoc.h"
20#include "clang/Analysis/DomainSpecific/CocoaConventions.h"
21#include "clang/Edit/Commit.h"
22#include "clang/Edit/Rewriters.h"
23#include "clang/Lex/Preprocessor.h"
24#include "clang/Sema/Initialization.h"
25#include "clang/Sema/Lookup.h"
26#include "clang/Sema/Scope.h"
27#include "clang/Sema/ScopeInfo.h"
28#include "llvm/ADT/SmallString.h"
29
30using namespace clang;
31using namespace sema;
32using llvm::makeArrayRef;
33
34ExprResult Sema::ParseObjCStringLiteral(SourceLocation *AtLocs,
35 ArrayRef<Expr *> Strings) {
36 // Most ObjC strings are formed out of a single piece. However, we *can*
37 // have strings formed out of multiple @ strings with multiple pptokens in
38 // each one, e.g. @"foo" "bar" @"baz" "qux" which need to be turned into one
39 // StringLiteral for ObjCStringLiteral to hold onto.
40 StringLiteral *S = cast<StringLiteral>(Strings[0]);
41
42 // If we have a multi-part string, merge it all together.
43 if (Strings.size() != 1) {
44 // Concatenate objc strings.
45 SmallString<128> StrBuf;
46 SmallVector<SourceLocation, 8> StrLocs;
47
48 for (Expr *E : Strings) {
49 S = cast<StringLiteral>(E);
50
51 // ObjC strings can't be wide or UTF.
52 if (!S->isAscii()) {
53 Diag(S->getLocStart(), diag::err_cfstring_literal_not_string_constant)
54 << S->getSourceRange();
55 return true;
56 }
57
58 // Append the string.
59 StrBuf += S->getString();
60
61 // Get the locations of the string tokens.
62 StrLocs.append(S->tokloc_begin(), S->tokloc_end());
63 }
64
65 // Create the aggregate string with the appropriate content and location
66 // information.
67 const ConstantArrayType *CAT = Context.getAsConstantArrayType(S->getType());
68 assert(CAT && "String literal not of constant array type!")(static_cast <bool> (CAT && "String literal not of constant array type!"
) ? void (0) : __assert_fail ("CAT && \"String literal not of constant array type!\""
, "/build/llvm-toolchain-snapshot-7~svn337490/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 68, __extension__ __PRETTY_FUNCTION__))
;
69 QualType StrTy = Context.getConstantArrayType(
70 CAT->getElementType(), llvm::APInt(32, StrBuf.size() + 1),
71 CAT->getSizeModifier(), CAT->getIndexTypeCVRQualifiers());
72 S = StringLiteral::Create(Context, StrBuf, StringLiteral::Ascii,
73 /*Pascal=*/false, StrTy, &StrLocs[0],
74 StrLocs.size());
75 }
76
77 return BuildObjCStringLiteral(AtLocs[0], S);
78}
79
80ExprResult Sema::BuildObjCStringLiteral(SourceLocation AtLoc, StringLiteral *S){
81 // Verify that this composite string is acceptable for ObjC strings.
82 if (CheckObjCString(S))
83 return true;
84
85 // Initialize the constant string interface lazily. This assumes
86 // the NSString interface is seen in this translation unit. Note: We
87 // don't use NSConstantString, since the runtime team considers this
88 // interface private (even though it appears in the header files).
89 QualType Ty = Context.getObjCConstantStringInterface();
90 if (!Ty.isNull()) {
91 Ty = Context.getObjCObjectPointerType(Ty);
92 } else if (getLangOpts().NoConstantCFStrings) {
93 IdentifierInfo *NSIdent=nullptr;
94 std::string StringClass(getLangOpts().ObjCConstantStringClass);
95
96 if (StringClass.empty())
97 NSIdent = &Context.Idents.get("NSConstantString");
98 else
99 NSIdent = &Context.Idents.get(StringClass);
100
101 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc,
102 LookupOrdinaryName);
103 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
104 Context.setObjCConstantStringInterface(StrIF);
105 Ty = Context.getObjCConstantStringInterface();
106 Ty = Context.getObjCObjectPointerType(Ty);
107 } else {
108 // If there is no NSConstantString interface defined then treat this
109 // as error and recover from it.
110 Diag(S->getLocStart(), diag::err_no_nsconstant_string_class) << NSIdent
111 << S->getSourceRange();
112 Ty = Context.getObjCIdType();
113 }
114 } else {
115 IdentifierInfo *NSIdent = NSAPIObj->getNSClassId(NSAPI::ClassId_NSString);
116 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc,
117 LookupOrdinaryName);
118 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
119 Context.setObjCConstantStringInterface(StrIF);
120 Ty = Context.getObjCConstantStringInterface();
121 Ty = Context.getObjCObjectPointerType(Ty);
122 } else {
123 // If there is no NSString interface defined, implicitly declare
124 // a @class NSString; and use that instead. This is to make sure
125 // type of an NSString literal is represented correctly, instead of
126 // being an 'id' type.
127 Ty = Context.getObjCNSStringType();
128 if (Ty.isNull()) {
129 ObjCInterfaceDecl *NSStringIDecl =
130 ObjCInterfaceDecl::Create (Context,
131 Context.getTranslationUnitDecl(),
132 SourceLocation(), NSIdent,
133 nullptr, nullptr, SourceLocation());
134 Ty = Context.getObjCInterfaceType(NSStringIDecl);
135 Context.setObjCNSStringType(Ty);
136 }
137 Ty = Context.getObjCObjectPointerType(Ty);
138 }
139 }
140
141 return new (Context) ObjCStringLiteral(S, Ty, AtLoc);
142}
143
144/// 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"
, "/build/llvm-toolchain-snapshot-7~svn337490/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
403 = InitializationKind::CreateCopy(Element->getLocStart(),
404 SourceLocation());
405 InitializationSequence Seq(S, Entity, Kind, Element);
406 if (!Seq.Failed())
407 return Seq.Perform(S, Entity, Kind, Element);
408 }
409
410 Expr *OrigElement = Element;
411
412 // Perform lvalue-to-rvalue conversion.
413 Result = S.DefaultLvalueConversion(Element);
414 if (Result.isInvalid())
415 return ExprError();
416 Element = Result.get();
417
418 // Make sure that we have an Objective-C pointer type or block.
419 if (!Element->getType()->isObjCObjectPointerType() &&
420 !Element->getType()->isBlockPointerType()) {
421 bool Recovered = false;
422
423 // If this is potentially an Objective-C numeric literal, add the '@'.
424 if (isa<IntegerLiteral>(OrigElement) ||
425 isa<CharacterLiteral>(OrigElement) ||
426 isa<FloatingLiteral>(OrigElement) ||
427 isa<ObjCBoolLiteralExpr>(OrigElement) ||
428 isa<CXXBoolLiteralExpr>(OrigElement)) {
429 if (S.NSAPIObj->getNSNumberFactoryMethodKind(OrigElement->getType())) {
430 int Which = isa<CharacterLiteral>(OrigElement) ? 1
431 : (isa<CXXBoolLiteralExpr>(OrigElement) ||
432 isa<ObjCBoolLiteralExpr>(OrigElement)) ? 2
433 : 3;
434
435 S.Diag(OrigElement->getLocStart(), diag::err_box_literal_collection)
436 << Which << OrigElement->getSourceRange()
437 << FixItHint::CreateInsertion(OrigElement->getLocStart(), "@");
438
439 Result = S.BuildObjCNumericLiteral(OrigElement->getLocStart(),
440 OrigElement);
441 if (Result.isInvalid())
442 return ExprError();
443
444 Element = Result.get();
445 Recovered = true;
446 }
447 }
448 // If this is potentially an Objective-C string literal, add the '@'.
449 else if (StringLiteral *String = dyn_cast<StringLiteral>(OrigElement)) {
450 if (String->isAscii()) {
451 S.Diag(OrigElement->getLocStart(), diag::err_box_literal_collection)
452 << 0 << OrigElement->getSourceRange()
453 << FixItHint::CreateInsertion(OrigElement->getLocStart(), "@");
454
455 Result = S.BuildObjCStringLiteral(OrigElement->getLocStart(), String);
456 if (Result.isInvalid())
457 return ExprError();
458
459 Element = Result.get();
460 Recovered = true;
461 }
462 }
463
464 if (!Recovered) {
465 S.Diag(Element->getLocStart(), diag::err_invalid_collection_element)
466 << Element->getType();
467 return ExprError();
468 }
469 }
470 if (ArrayLiteral)
471 if (ObjCStringLiteral *getString =
472 dyn_cast<ObjCStringLiteral>(OrigElement)) {
473 if (StringLiteral *SL = getString->getString()) {
474 unsigned numConcat = SL->getNumConcatenated();
475 if (numConcat > 1) {
476 // Only warn if the concatenated string doesn't come from a macro.
477 bool hasMacro = false;
478 for (unsigned i = 0; i < numConcat ; ++i)
479 if (SL->getStrTokenLoc(i).isMacroID()) {
480 hasMacro = true;
481 break;
482 }
483 if (!hasMacro)
484 S.Diag(Element->getLocStart(),
485 diag::warn_concatenated_nsarray_literal)
486 << Element->getType();
487 }
488 }
489 }
490
491 // Make sure that the element has the type that the container factory
492 // function expects.
493 return S.PerformCopyInitialization(
494 InitializedEntity::InitializeParameter(S.Context, T,
495 /*Consumed=*/false),
496 Element->getLocStart(), Element);
497}
498
499ExprResult Sema::BuildObjCBoxedExpr(SourceRange SR, Expr *ValueExpr) {
500 if (ValueExpr->isTypeDependent()) {
501 ObjCBoxedExpr *BoxedExpr =
502 new (Context) ObjCBoxedExpr(ValueExpr, Context.DependentTy, nullptr, SR);
503 return BoxedExpr;
504 }
505 ObjCMethodDecl *BoxingMethod = nullptr;
506 QualType BoxedType;
507 // Convert the expression to an RValue, so we can check for pointer types...
508 ExprResult RValue = DefaultFunctionArrayLvalueConversion(ValueExpr);
509 if (RValue.isInvalid()) {
510 return ExprError();
511 }
512 SourceLocation Loc = SR.getBegin();
513 ValueExpr = RValue.get();
514 QualType ValueType(ValueExpr->getType());
515 if (const PointerType *PT = ValueType->getAs<PointerType>()) {
516 QualType PointeeType = PT->getPointeeType();
517 if (Context.hasSameUnqualifiedType(PointeeType, Context.CharTy)) {
518
519 if (!NSStringDecl) {
520 NSStringDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
521 Sema::LK_String);
522 if (!NSStringDecl) {
523 return ExprError();
524 }
525 QualType NSStringObject = Context.getObjCInterfaceType(NSStringDecl);
526 NSStringPointer = Context.getObjCObjectPointerType(NSStringObject);
527 }
528
529 if (!StringWithUTF8StringMethod) {
530 IdentifierInfo *II = &Context.Idents.get("stringWithUTF8String");
531 Selector stringWithUTF8String = Context.Selectors.getUnarySelector(II);
532
533 // Look for the appropriate method within NSString.
534 BoxingMethod = NSStringDecl->lookupClassMethod(stringWithUTF8String);
535 if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) {
536 // Debugger needs to work even if NSString hasn't been defined.
537 TypeSourceInfo *ReturnTInfo = nullptr;
538 ObjCMethodDecl *M = ObjCMethodDecl::Create(
539 Context, SourceLocation(), SourceLocation(), stringWithUTF8String,
540 NSStringPointer, ReturnTInfo, NSStringDecl,
541 /*isInstance=*/false, /*isVariadic=*/false,
542 /*isPropertyAccessor=*/false,
543 /*isImplicitlyDeclared=*/true,
544 /*isDefined=*/false, ObjCMethodDecl::Required,
545 /*HasRelatedResultType=*/false);
546 QualType ConstCharType = Context.CharTy.withConst();
547 ParmVarDecl *value =
548 ParmVarDecl::Create(Context, M,
549 SourceLocation(), SourceLocation(),
550 &Context.Idents.get("value"),
551 Context.getPointerType(ConstCharType),
552 /*TInfo=*/nullptr,
553 SC_None, nullptr);
554 M->setMethodParams(Context, value, None);
555 BoxingMethod = M;
556 }
557
558 if (!validateBoxingMethod(*this, Loc, NSStringDecl,
559 stringWithUTF8String, BoxingMethod))
560 return ExprError();
561
562 StringWithUTF8StringMethod = BoxingMethod;
563 }
564
565 BoxingMethod = StringWithUTF8StringMethod;
566 BoxedType = NSStringPointer;
567 // Transfer the nullability from method's return type.
568 Optional<NullabilityKind> Nullability =
569 BoxingMethod->getReturnType()->getNullability(Context);
570 if (Nullability)
571 BoxedType = Context.getAttributedType(
572 AttributedType::getNullabilityAttrKind(*Nullability), BoxedType,
573 BoxedType);
574 }
575 } else if (ValueType->isBuiltinType()) {
576 // The other types we support are numeric, char and BOOL/bool. We could also
577 // provide limited support for structure types, such as NSRange, NSRect, and
578 // NSSize. See NSValue (NSValueGeometryExtensions) in <Foundation/NSGeometry.h>
579 // for more details.
580
581 // Check for a top-level character literal.
582 if (const CharacterLiteral *Char =
583 dyn_cast<CharacterLiteral>(ValueExpr->IgnoreParens())) {
584 // In C, character literals have type 'int'. That's not the type we want
585 // to use to determine the Objective-c literal kind.
586 switch (Char->getKind()) {
587 case CharacterLiteral::Ascii:
588 case CharacterLiteral::UTF8:
589 ValueType = Context.CharTy;
590 break;
591
592 case CharacterLiteral::Wide:
593 ValueType = Context.getWideCharType();
594 break;
595
596 case CharacterLiteral::UTF16:
597 ValueType = Context.Char16Ty;
598 break;
599
600 case CharacterLiteral::UTF32:
601 ValueType = Context.Char32Ty;
602 break;
603 }
604 }
605 // FIXME: Do I need to do anything special with BoolTy expressions?
606
607 // Look for the appropriate method within NSNumber.
608 BoxingMethod = getNSNumberFactoryMethod(*this, Loc, ValueType);
609 BoxedType = NSNumberPointer;
610 } else if (const EnumType *ET = ValueType->getAs<EnumType>()) {
611 if (!ET->getDecl()->isComplete()) {
612 Diag(Loc, diag::err_objc_incomplete_boxed_expression_type)
613 << ValueType << ValueExpr->getSourceRange();
614 return ExprError();
615 }
616
617 BoxingMethod = getNSNumberFactoryMethod(*this, Loc,
618 ET->getDecl()->getIntegerType());
619 BoxedType = NSNumberPointer;
620 } else if (ValueType->isObjCBoxableRecordType()) {
621 // Support for structure types, that marked as objc_boxable
622 // struct __attribute__((objc_boxable)) s { ... };
623
624 // Look up the NSValue class, if we haven't done so already. It's cached
625 // in the Sema instance.
626 if (!NSValueDecl) {
627 NSValueDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
628 Sema::LK_Boxed);
629 if (!NSValueDecl) {
630 return ExprError();
631 }
632
633 // generate the pointer to NSValue type.
634 QualType NSValueObject = Context.getObjCInterfaceType(NSValueDecl);
635 NSValuePointer = Context.getObjCObjectPointerType(NSValueObject);
636 }
637
638 if (!ValueWithBytesObjCTypeMethod) {
639 IdentifierInfo *II[] = {
640 &Context.Idents.get("valueWithBytes"),
641 &Context.Idents.get("objCType")
642 };
643 Selector ValueWithBytesObjCType = Context.Selectors.getSelector(2, II);
644
645 // Look for the appropriate method within NSValue.
646 BoxingMethod = NSValueDecl->lookupClassMethod(ValueWithBytesObjCType);
647 if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) {
648 // Debugger needs to work even if NSValue hasn't been defined.
649 TypeSourceInfo *ReturnTInfo = nullptr;
650 ObjCMethodDecl *M = ObjCMethodDecl::Create(
651 Context,
652 SourceLocation(),
653 SourceLocation(),
654 ValueWithBytesObjCType,
655 NSValuePointer,
656 ReturnTInfo,
657 NSValueDecl,
658 /*isInstance=*/false,
659 /*isVariadic=*/false,
660 /*isPropertyAccessor=*/false,
661 /*isImplicitlyDeclared=*/true,
662 /*isDefined=*/false,
663 ObjCMethodDecl::Required,
664 /*HasRelatedResultType=*/false);
665
666 SmallVector<ParmVarDecl *, 2> Params;
667
668 ParmVarDecl *bytes =
669 ParmVarDecl::Create(Context, M,
670 SourceLocation(), SourceLocation(),
671 &Context.Idents.get("bytes"),
672 Context.VoidPtrTy.withConst(),
673 /*TInfo=*/nullptr,
674 SC_None, nullptr);
675 Params.push_back(bytes);
676
677 QualType ConstCharType = Context.CharTy.withConst();
678 ParmVarDecl *type =
679 ParmVarDecl::Create(Context, M,
680 SourceLocation(), SourceLocation(),
681 &Context.Idents.get("type"),
682 Context.getPointerType(ConstCharType),
683 /*TInfo=*/nullptr,
684 SC_None, nullptr);
685 Params.push_back(type);
686
687 M->setMethodParams(Context, Params, None);
688 BoxingMethod = M;
689 }
690
691 if (!validateBoxingMethod(*this, Loc, NSValueDecl,
692 ValueWithBytesObjCType, BoxingMethod))
693 return ExprError();
694
695 ValueWithBytesObjCTypeMethod = BoxingMethod;
696 }
697
698 if (!ValueType.isTriviallyCopyableType(Context)) {
699 Diag(Loc, diag::err_objc_non_trivially_copyable_boxed_expression_type)
700 << ValueType << ValueExpr->getSourceRange();
701 return ExprError();
702 }
703
704 BoxingMethod = ValueWithBytesObjCTypeMethod;
705 BoxedType = NSValuePointer;
706 }
707
708 if (!BoxingMethod) {
709 Diag(Loc, diag::err_objc_illegal_boxed_expression_type)
710 << ValueType << ValueExpr->getSourceRange();
711 return ExprError();
712 }
713
714 DiagnoseUseOfDecl(BoxingMethod, Loc);
715
716 ExprResult ConvertedValueExpr;
717 if (ValueType->isObjCBoxableRecordType()) {
718 InitializedEntity IE = InitializedEntity::InitializeTemporary(ValueType);
719 ConvertedValueExpr = PerformCopyInitialization(IE, ValueExpr->getExprLoc(),
720 ValueExpr);
721 } else {
722 // Convert the expression to the type that the parameter requires.
723 ParmVarDecl *ParamDecl = BoxingMethod->parameters()[0];
724 InitializedEntity IE = InitializedEntity::InitializeParameter(Context,
725 ParamDecl);
726 ConvertedValueExpr = PerformCopyInitialization(IE, SourceLocation(),
727 ValueExpr);
728 }
729
730 if (ConvertedValueExpr.isInvalid())
731 return ExprError();
732 ValueExpr = ConvertedValueExpr.get();
733
734 ObjCBoxedExpr *BoxedExpr =
735 new (Context) ObjCBoxedExpr(ValueExpr, BoxedType,
736 BoxingMethod, SR);
737 return MaybeBindToTemporary(BoxedExpr);
738}
739
740/// Build an ObjC subscript pseudo-object expression, given that
741/// that's supported by the runtime.
742ExprResult Sema::BuildObjCSubscriptExpression(SourceLocation RB, Expr *BaseExpr,
743 Expr *IndexExpr,
744 ObjCMethodDecl *getterMethod,
745 ObjCMethodDecl *setterMethod) {
746 assert(!LangOpts.isSubscriptPointerArithmetic())(static_cast <bool> (!LangOpts.isSubscriptPointerArithmetic
()) ? void (0) : __assert_fail ("!LangOpts.isSubscriptPointerArithmetic()"
, "/build/llvm-toolchain-snapshot-7~svn337490/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 746, __extension__ __PRETTY_FUNCTION__))
;
747
748 // We can't get dependent types here; our callers should have
749 // filtered them out.
750 assert((!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) &&(static_cast <bool> ((!BaseExpr->isTypeDependent() &&
!IndexExpr->isTypeDependent()) && "base or index cannot have dependent type here"
) ? void (0) : __assert_fail ("(!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) && \"base or index cannot have dependent type here\""
, "/build/llvm-toolchain-snapshot-7~svn337490/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 751, __extension__ __PRETTY_FUNCTION__))
751 "base or index cannot have dependent type here")(static_cast <bool> ((!BaseExpr->isTypeDependent() &&
!IndexExpr->isTypeDependent()) && "base or index cannot have dependent type here"
) ? void (0) : __assert_fail ("(!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) && \"base or index cannot have dependent type here\""
, "/build/llvm-toolchain-snapshot-7~svn337490/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 751, __extension__ __PRETTY_FUNCTION__))
;
752
753 // Filter out placeholders in the index. In theory, overloads could
754 // be preserved here, although that might not actually work correctly.
755 ExprResult Result = CheckPlaceholderExpr(IndexExpr);
756 if (Result.isInvalid())
757 return ExprError();
758 IndexExpr = Result.get();
759
760 // Perform lvalue-to-rvalue conversion on the base.
761 Result = DefaultLvalueConversion(BaseExpr);
762 if (Result.isInvalid())
763 return ExprError();
764 BaseExpr = Result.get();
765
766 // Build the pseudo-object expression.
767 return new (Context) ObjCSubscriptRefExpr(
768 BaseExpr, IndexExpr, Context.PseudoObjectTy, VK_LValue, OK_ObjCSubscript,
769 getterMethod, setterMethod, RB);
770}
771
772ExprResult Sema::BuildObjCArrayLiteral(SourceRange SR, MultiExprArg Elements) {
773 SourceLocation Loc = SR.getBegin();
774
775 if (!NSArrayDecl) {
776 NSArrayDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
777 Sema::LK_Array);
778 if (!NSArrayDecl) {
779 return ExprError();
780 }
781 }
782
783 // Find the arrayWithObjects:count: method, if we haven't done so already.
784 QualType IdT = Context.getObjCIdType();
785 if (!ArrayWithObjectsMethod) {
786 Selector
787 Sel = NSAPIObj->getNSArraySelector(NSAPI::NSArr_arrayWithObjectsCount);
788 ObjCMethodDecl *Method = NSArrayDecl->lookupClassMethod(Sel);
789 if (!Method && getLangOpts().DebuggerObjCLiteral) {
790 TypeSourceInfo *ReturnTInfo = nullptr;
791 Method = ObjCMethodDecl::Create(
792 Context, SourceLocation(), SourceLocation(), Sel, IdT, ReturnTInfo,
793 Context.getTranslationUnitDecl(), false /*Instance*/,
794 false /*isVariadic*/,
795 /*isPropertyAccessor=*/false,
796 /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
797 ObjCMethodDecl::Required, false);
798 SmallVector<ParmVarDecl *, 2> Params;
799 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
800 SourceLocation(),
801 SourceLocation(),
802 &Context.Idents.get("objects"),
803 Context.getPointerType(IdT),
804 /*TInfo=*/nullptr,
805 SC_None, nullptr);
806 Params.push_back(objects);
807 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
808 SourceLocation(),
809 SourceLocation(),
810 &Context.Idents.get("cnt"),
811 Context.UnsignedLongTy,
812 /*TInfo=*/nullptr, SC_None,
813 nullptr);
814 Params.push_back(cnt);
815 Method->setMethodParams(Context, Params, None);
816 }
817
818 if (!validateBoxingMethod(*this, Loc, NSArrayDecl, Sel, Method))
819 return ExprError();
820
821 // Dig out the type that all elements should be converted to.
822 QualType T = Method->parameters()[0]->getType();
823 const PointerType *PtrT = T->getAs<PointerType>();
824 if (!PtrT ||
825 !Context.hasSameUnqualifiedType(PtrT->getPointeeType(), IdT)) {
826 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
827 << Sel;
828 Diag(Method->parameters()[0]->getLocation(),
829 diag::note_objc_literal_method_param)
830 << 0 << T
831 << Context.getPointerType(IdT.withConst());
832 return ExprError();
833 }
834
835 // Check that the 'count' parameter is integral.
836 if (!Method->parameters()[1]->getType()->isIntegerType()) {
837 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
838 << Sel;
839 Diag(Method->parameters()[1]->getLocation(),
840 diag::note_objc_literal_method_param)
841 << 1
842 << Method->parameters()[1]->getType()
843 << "integral";
844 return ExprError();
845 }
846
847 // We've found a good +arrayWithObjects:count: method. Save it!
848 ArrayWithObjectsMethod = Method;
849 }
850
851 QualType ObjectsType = ArrayWithObjectsMethod->parameters()[0]->getType();
852 QualType RequiredType = ObjectsType->castAs<PointerType>()->getPointeeType();
853
854 // Check that each of the elements provided is valid in a collection literal,
855 // performing conversions as necessary.
856 Expr **ElementsBuffer = Elements.data();
857 for (unsigned I = 0, N = Elements.size(); I != N; ++I) {
858 ExprResult Converted = CheckObjCCollectionLiteralElement(*this,
859 ElementsBuffer[I],
860 RequiredType, true);
861 if (Converted.isInvalid())
862 return ExprError();
863
864 ElementsBuffer[I] = Converted.get();
865 }
866
867 QualType Ty
868 = Context.getObjCObjectPointerType(
869 Context.getObjCInterfaceType(NSArrayDecl));
870
871 return MaybeBindToTemporary(
872 ObjCArrayLiteral::Create(Context, Elements, Ty,
873 ArrayWithObjectsMethod, SR));
874}
875
876ExprResult Sema::BuildObjCDictionaryLiteral(SourceRange SR,
877 MutableArrayRef<ObjCDictionaryElement> Elements) {
878 SourceLocation Loc = SR.getBegin();
879
880 if (!NSDictionaryDecl) {
881 NSDictionaryDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
882 Sema::LK_Dictionary);
883 if (!NSDictionaryDecl) {
884 return ExprError();
885 }
886 }
887
888 // Find the dictionaryWithObjects:forKeys:count: method, if we haven't done
889 // so already.
890 QualType IdT = Context.getObjCIdType();
891 if (!DictionaryWithObjectsMethod) {
892 Selector Sel = NSAPIObj->getNSDictionarySelector(
893 NSAPI::NSDict_dictionaryWithObjectsForKeysCount);
894 ObjCMethodDecl *Method = NSDictionaryDecl->lookupClassMethod(Sel);
895 if (!Method && getLangOpts().DebuggerObjCLiteral) {
896 Method = ObjCMethodDecl::Create(Context,
897 SourceLocation(), SourceLocation(), Sel,
898 IdT,
899 nullptr /*TypeSourceInfo */,
900 Context.getTranslationUnitDecl(),
901 false /*Instance*/, false/*isVariadic*/,
902 /*isPropertyAccessor=*/false,
903 /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
904 ObjCMethodDecl::Required,
905 false);
906 SmallVector<ParmVarDecl *, 3> Params;
907 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
908 SourceLocation(),
909 SourceLocation(),
910 &Context.Idents.get("objects"),
911 Context.getPointerType(IdT),
912 /*TInfo=*/nullptr, SC_None,
913 nullptr);
914 Params.push_back(objects);
915 ParmVarDecl *keys = ParmVarDecl::Create(Context, Method,
916 SourceLocation(),
917 SourceLocation(),
918 &Context.Idents.get("keys"),
919 Context.getPointerType(IdT),
920 /*TInfo=*/nullptr, SC_None,
921 nullptr);
922 Params.push_back(keys);
923 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
924 SourceLocation(),
925 SourceLocation(),
926 &Context.Idents.get("cnt"),
927 Context.UnsignedLongTy,
928 /*TInfo=*/nullptr, SC_None,
929 nullptr);
930 Params.push_back(cnt);
931 Method->setMethodParams(Context, Params, None);
932 }
933
934 if (!validateBoxingMethod(*this, SR.getBegin(), NSDictionaryDecl, Sel,
935 Method))
936 return ExprError();
937
938 // Dig out the type that all values should be converted to.
939 QualType ValueT = Method->parameters()[0]->getType();
940 const PointerType *PtrValue = ValueT->getAs<PointerType>();
941 if (!PtrValue ||
942 !Context.hasSameUnqualifiedType(PtrValue->getPointeeType(), IdT)) {
943 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
944 << Sel;
945 Diag(Method->parameters()[0]->getLocation(),
946 diag::note_objc_literal_method_param)
947 << 0 << ValueT
948 << Context.getPointerType(IdT.withConst());
949 return ExprError();
950 }
951
952 // Dig out the type that all keys should be converted to.
953 QualType KeyT = Method->parameters()[1]->getType();
954 const PointerType *PtrKey = KeyT->getAs<PointerType>();
955 if (!PtrKey ||
956 !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
957 IdT)) {
958 bool err = true;
959 if (PtrKey) {
960 if (QIDNSCopying.isNull()) {
961 // key argument of selector is id<NSCopying>?
962 if (ObjCProtocolDecl *NSCopyingPDecl =
963 LookupProtocol(&Context.Idents.get("NSCopying"), SR.getBegin())) {
964 ObjCProtocolDecl *PQ[] = {NSCopyingPDecl};
965 QIDNSCopying =
966 Context.getObjCObjectType(Context.ObjCBuiltinIdTy, { },
967 llvm::makeArrayRef(
968 (ObjCProtocolDecl**) PQ,
969 1),
970 false);
971 QIDNSCopying = Context.getObjCObjectPointerType(QIDNSCopying);
972 }
973 }
974 if (!QIDNSCopying.isNull())
975 err = !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
976 QIDNSCopying);
977 }
978
979 if (err) {
980 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
981 << Sel;
982 Diag(Method->parameters()[1]->getLocation(),
983 diag::note_objc_literal_method_param)
984 << 1 << KeyT
985 << Context.getPointerType(IdT.withConst());
986 return ExprError();
987 }
988 }
989
990 // Check that the 'count' parameter is integral.
991 QualType CountType = Method->parameters()[2]->getType();
992 if (!CountType->isIntegerType()) {
993 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
994 << Sel;
995 Diag(Method->parameters()[2]->getLocation(),
996 diag::note_objc_literal_method_param)
997 << 2 << CountType
998 << "integral";
999 return ExprError();
1000 }
1001
1002 // We've found a good +dictionaryWithObjects:keys:count: method; save it!
1003 DictionaryWithObjectsMethod = Method;
1004 }
1005
1006 QualType ValuesT = DictionaryWithObjectsMethod->parameters()[0]->getType();
1007 QualType ValueT = ValuesT->castAs<PointerType>()->getPointeeType();
1008 QualType KeysT = DictionaryWithObjectsMethod->parameters()[1]->getType();
1009 QualType KeyT = KeysT->castAs<PointerType>()->getPointeeType();
1010
1011 // Check that each of the keys and values provided is valid in a collection
1012 // literal, performing conversions as necessary.
1013 bool HasPackExpansions = false;
1014 for (ObjCDictionaryElement &Element : Elements) {
1015 // Check the key.
1016 ExprResult Key = CheckObjCCollectionLiteralElement(*this, Element.Key,
1017 KeyT);
1018 if (Key.isInvalid())
1019 return ExprError();
1020
1021 // Check the value.
1022 ExprResult Value
1023 = CheckObjCCollectionLiteralElement(*this, Element.Value, ValueT);
1024 if (Value.isInvalid())
1025 return ExprError();
1026
1027 Element.Key = Key.get();
1028 Element.Value = Value.get();
1029
1030 if (Element.EllipsisLoc.isInvalid())
1031 continue;
1032
1033 if (!Element.Key->containsUnexpandedParameterPack() &&
1034 !Element.Value->containsUnexpandedParameterPack()) {
1035 Diag(Element.EllipsisLoc,
1036 diag::err_pack_expansion_without_parameter_packs)
1037 << SourceRange(Element.Key->getLocStart(),
1038 Element.Value->getLocEnd());
1039 return ExprError();
1040 }
1041
1042 HasPackExpansions = true;
1043 }
1044
1045 QualType Ty
1046 = Context.getObjCObjectPointerType(
1047 Context.getObjCInterfaceType(NSDictionaryDecl));
1048 return MaybeBindToTemporary(ObjCDictionaryLiteral::Create(
1049 Context, Elements, HasPackExpansions, Ty,
1050 DictionaryWithObjectsMethod, SR));
1051}
1052
1053ExprResult Sema::BuildObjCEncodeExpression(SourceLocation AtLoc,
1054 TypeSourceInfo *EncodedTypeInfo,
1055 SourceLocation RParenLoc) {
1056 QualType EncodedType = EncodedTypeInfo->getType();
1057 QualType StrTy;
1058 if (EncodedType->isDependentType())
1059 StrTy = Context.DependentTy;
1060 else {
1061 if (!EncodedType->getAsArrayTypeUnsafe() && //// Incomplete array is handled.
1062 !EncodedType->isVoidType()) // void is handled too.
1063 if (RequireCompleteType(AtLoc, EncodedType,
1064 diag::err_incomplete_type_objc_at_encode,
1065 EncodedTypeInfo->getTypeLoc()))
1066 return ExprError();
1067
1068 std::string Str;
1069 QualType NotEncodedT;
1070 Context.getObjCEncodingForType(EncodedType, Str, nullptr, &NotEncodedT);
1071 if (!NotEncodedT.isNull())
1072 Diag(AtLoc, diag::warn_incomplete_encoded_type)
1073 << EncodedType << NotEncodedT;
1074
1075 // The type of @encode is the same as the type of the corresponding string,
1076 // which is an array type.
1077 StrTy = Context.CharTy;
1078 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
1079 if (getLangOpts().CPlusPlus || getLangOpts().ConstStrings)
1080 StrTy.addConst();
1081 StrTy = Context.getConstantArrayType(StrTy, llvm::APInt(32, Str.size()+1),
1082 ArrayType::Normal, 0);
1083 }
1084
1085 return new (Context) ObjCEncodeExpr(StrTy, EncodedTypeInfo, AtLoc, RParenLoc);
1086}
1087
1088ExprResult Sema::ParseObjCEncodeExpression(SourceLocation AtLoc,
1089 SourceLocation EncodeLoc,
1090 SourceLocation LParenLoc,
1091 ParsedType ty,
1092 SourceLocation RParenLoc) {
1093 // FIXME: Preserve type source info ?
1094 TypeSourceInfo *TInfo;
1095 QualType EncodedType = GetTypeFromParser(ty, &TInfo);
1096 if (!TInfo)
1097 TInfo = Context.getTrivialTypeSourceInfo(EncodedType,
1098 getLocForEndOfToken(LParenLoc));
1099
1100 return BuildObjCEncodeExpression(AtLoc, TInfo, RParenLoc);
1101}
1102
1103static bool HelperToDiagnoseMismatchedMethodsInGlobalPool(Sema &S,
1104 SourceLocation AtLoc,
1105 SourceLocation LParenLoc,
1106 SourceLocation RParenLoc,
1107 ObjCMethodDecl *Method,
1108 ObjCMethodList &MethList) {
1109 ObjCMethodList *M = &MethList;
1110 bool Warned = false;
1111 for (M = M->getNext(); M; M=M->getNext()) {
1112 ObjCMethodDecl *MatchingMethodDecl = M->getMethod();
1113 if (MatchingMethodDecl == Method ||
1114 isa<ObjCImplDecl>(MatchingMethodDecl->getDeclContext()) ||
1115 MatchingMethodDecl->getSelector() != Method->getSelector())
1116 continue;
1117 if (!S.MatchTwoMethodDeclarations(Method,
1118 MatchingMethodDecl, Sema::MMS_loose)) {
1119 if (!Warned) {
1120 Warned = true;
1121 S.Diag(AtLoc, diag::warn_multiple_selectors)
1122 << Method->getSelector() << FixItHint::CreateInsertion(LParenLoc, "(")
1123 << FixItHint::CreateInsertion(RParenLoc, ")");
1124 S.Diag(Method->getLocation(), diag::note_method_declared_at)
1125 << Method->getDeclName();
1126 }
1127 S.Diag(MatchingMethodDecl->getLocation(), diag::note_method_declared_at)
1128 << MatchingMethodDecl->getDeclName();
1129 }
1130 }
1131 return Warned;
1132}
1133
1134static void DiagnoseMismatchedSelectors(Sema &S, SourceLocation AtLoc,
1135 ObjCMethodDecl *Method,
1136 SourceLocation LParenLoc,
1137 SourceLocation RParenLoc,
1138 bool WarnMultipleSelectors) {
1139 if (!WarnMultipleSelectors ||
1140 S.Diags.isIgnored(diag::warn_multiple_selectors, SourceLocation()))
1141 return;
1142 bool Warned = false;
1143 for (Sema::GlobalMethodPool::iterator b = S.MethodPool.begin(),
1144 e = S.MethodPool.end(); b != e; b++) {
1145 // first, instance methods
1146 ObjCMethodList &InstMethList = b->second.first;
1147 if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc,
1148 Method, InstMethList))
1149 Warned = true;
1150
1151 // second, class methods
1152 ObjCMethodList &ClsMethList = b->second.second;
1153 if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc,
1154 Method, ClsMethList) || Warned)
1155 return;
1156 }
1157}
1158
1159ExprResult Sema::ParseObjCSelectorExpression(Selector Sel,
1160 SourceLocation AtLoc,
1161 SourceLocation SelLoc,
1162 SourceLocation LParenLoc,
1163 SourceLocation RParenLoc,
1164 bool WarnMultipleSelectors) {
1165 ObjCMethodDecl *Method = LookupInstanceMethodInGlobalPool(Sel,
1166 SourceRange(LParenLoc, RParenLoc));
1167 if (!Method)
1168 Method = LookupFactoryMethodInGlobalPool(Sel,
1169 SourceRange(LParenLoc, RParenLoc));
1170 if (!Method) {
1171 if (const ObjCMethodDecl *OM = SelectorsForTypoCorrection(Sel)) {
1172 Selector MatchedSel = OM->getSelector();
1173 SourceRange SelectorRange(LParenLoc.getLocWithOffset(1),
1174 RParenLoc.getLocWithOffset(-1));
1175 Diag(SelLoc, diag::warn_undeclared_selector_with_typo)
1176 << Sel << MatchedSel
1177 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1178
1179 } else
1180 Diag(SelLoc, diag::warn_undeclared_selector) << Sel;
1181 } else
1182 DiagnoseMismatchedSelectors(*this, AtLoc, Method, LParenLoc, RParenLoc,
1183 WarnMultipleSelectors);
1184
1185 if (Method &&
1186 Method->getImplementationControl() != ObjCMethodDecl::Optional &&
1187 !getSourceManager().isInSystemHeader(Method->getLocation()))
1188 ReferencedSelectors.insert(std::make_pair(Sel, AtLoc));
1189
1190 // In ARC, forbid the user from using @selector for
1191 // retain/release/autorelease/dealloc/retainCount.
1192 if (getLangOpts().ObjCAutoRefCount) {
1193 switch (Sel.getMethodFamily()) {
1194 case OMF_retain:
1195 case OMF_release:
1196 case OMF_autorelease:
1197 case OMF_retainCount:
1198 case OMF_dealloc:
1199 Diag(AtLoc, diag::err_arc_illegal_selector) <<
1200 Sel << SourceRange(LParenLoc, RParenLoc);
1201 break;
1202
1203 case OMF_None:
1204 case OMF_alloc:
1205 case OMF_copy:
1206 case OMF_finalize:
1207 case OMF_init:
1208 case OMF_mutableCopy:
1209 case OMF_new:
1210 case OMF_self:
1211 case OMF_initialize:
1212 case OMF_performSelector:
1213 break;
1214 }
1215 }
1216 QualType Ty = Context.getObjCSelType();
1217 return new (Context) ObjCSelectorExpr(Ty, Sel, AtLoc, RParenLoc);
1218}
1219
1220ExprResult Sema::ParseObjCProtocolExpression(IdentifierInfo *ProtocolId,
1221 SourceLocation AtLoc,
1222 SourceLocation ProtoLoc,
1223 SourceLocation LParenLoc,
1224 SourceLocation ProtoIdLoc,
1225 SourceLocation RParenLoc) {
1226 ObjCProtocolDecl* PDecl = LookupProtocol(ProtocolId, ProtoIdLoc);
1227 if (!PDecl) {
1228 Diag(ProtoLoc, diag::err_undeclared_protocol) << ProtocolId;
1229 return true;
1230 }
1231 if (PDecl->hasDefinition())
1232 PDecl = PDecl->getDefinition();
1233
1234 QualType Ty = Context.getObjCProtoType();
1235 if (Ty.isNull())
1236 return true;
1237 Ty = Context.getObjCObjectPointerType(Ty);
1238 return new (Context) ObjCProtocolExpr(Ty, PDecl, AtLoc, ProtoIdLoc, RParenLoc);
1239}
1240
1241/// Try to capture an implicit reference to 'self'.
1242ObjCMethodDecl *Sema::tryCaptureObjCSelf(SourceLocation Loc) {
1243 DeclContext *DC = getFunctionLevelDeclContext();
1244
1245 // If we're not in an ObjC method, error out. Note that, unlike the
1246 // C++ case, we don't require an instance method --- class methods
1247 // still have a 'self', and we really do still need to capture it!
1248 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(DC);
1249 if (!method)
1250 return nullptr;
1251
1252 tryCaptureVariable(method->getSelfDecl(), Loc);
1253
1254 return method;
1255}
1256
1257static QualType stripObjCInstanceType(ASTContext &Context, QualType T) {
1258 QualType origType = T;
1259 if (auto nullability = AttributedType::stripOuterNullability(T)) {
1260 if (T == Context.getObjCInstanceType()) {
1261 return Context.getAttributedType(
1262 AttributedType::getNullabilityAttrKind(*nullability),
1263 Context.getObjCIdType(),
1264 Context.getObjCIdType());
1265 }
1266
1267 return origType;
1268 }
1269
1270 if (T == Context.getObjCInstanceType())
1271 return Context.getObjCIdType();
1272
1273 return origType;
1274}
1275
1276/// Determine the result type of a message send based on the receiver type,
1277/// method, and the kind of message send.
1278///
1279/// This is the "base" result type, which will still need to be adjusted
1280/// to account for nullability.
1281static QualType getBaseMessageSendResultType(Sema &S,
1282 QualType ReceiverType,
1283 ObjCMethodDecl *Method,
1284 bool isClassMessage,
1285 bool isSuperMessage) {
1286 assert(Method && "Must have a method")(static_cast <bool> (Method && "Must have a method"
) ? void (0) : __assert_fail ("Method && \"Must have a method\""
, "/build/llvm-toolchain-snapshot-7~svn337490/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 1286, __extension__ __PRETTY_FUNCTION__))
;
1287 if (!Method->hasRelatedResultType())
1288 return Method->getSendResultType(ReceiverType);
1289
1290 ASTContext &Context = S.Context;
1291
1292 // Local function that transfers the nullability of the method's
1293 // result type to the returned result.
1294 auto transferNullability = [&](QualType type) -> QualType {
1295 // If the method's result type has nullability, extract it.
1296 if (auto nullability = Method->getSendResultType(ReceiverType)
1297 ->getNullability(Context)){
1298 // Strip off any outer nullability sugar from the provided type.
1299 (void)AttributedType::stripOuterNullability(type);
1300
1301 // Form a new attributed type using the method result type's nullability.
1302 return Context.getAttributedType(
1303 AttributedType::getNullabilityAttrKind(*nullability),
1304 type,
1305 type);
1306 }
1307
1308 return type;
1309 };
1310
1311 // If a method has a related return type:
1312 // - if the method found is an instance method, but the message send
1313 // was a class message send, T is the declared return type of the method
1314 // found
1315 if (Method->isInstanceMethod() && isClassMessage)
1316 return stripObjCInstanceType(Context,
1317 Method->getSendResultType(ReceiverType));
1318
1319 // - if the receiver is super, T is a pointer to the class of the
1320 // enclosing method definition
1321 if (isSuperMessage) {
1322 if (ObjCMethodDecl *CurMethod = S.getCurMethodDecl())
1323 if (ObjCInterfaceDecl *Class = CurMethod->getClassInterface()) {
1324 return transferNullability(
1325 Context.getObjCObjectPointerType(
1326 Context.getObjCInterfaceType(Class)));
1327 }
1328 }
1329
1330 // - if the receiver is the name of a class U, T is a pointer to U
1331 if (ReceiverType->getAsObjCInterfaceType())
1332 return transferNullability(Context.getObjCObjectPointerType(ReceiverType));
1333 // - if the receiver is of type Class or qualified Class type,
1334 // T is the declared return type of the method.
1335 if (ReceiverType->isObjCClassType() ||
1336 ReceiverType->isObjCQualifiedClassType())
1337 return stripObjCInstanceType(Context,
1338 Method->getSendResultType(ReceiverType));
1339
1340 // - if the receiver is id, qualified id, Class, or qualified Class, T
1341 // is the receiver type, otherwise
1342 // - T is the type of the receiver expression.
1343 return transferNullability(ReceiverType);
1344}
1345
1346QualType Sema::getMessageSendResultType(QualType ReceiverType,
1347 ObjCMethodDecl *Method,
1348 bool isClassMessage,
1349 bool isSuperMessage) {
1350 // Produce the result type.
1351 QualType resultType = getBaseMessageSendResultType(*this, ReceiverType,
1352 Method,
1353 isClassMessage,
1354 isSuperMessage);
1355
1356 // If this is a class message, ignore the nullability of the receiver.
1357 if (isClassMessage)
1358 return resultType;
1359
1360 // Map the nullability of the result into a table index.
1361 unsigned receiverNullabilityIdx = 0;
1362 if (auto nullability = ReceiverType->getNullability(Context))
1363 receiverNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1364
1365 unsigned resultNullabilityIdx = 0;
1366 if (auto nullability = resultType->getNullability(Context))
1367 resultNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1368
1369 // The table of nullability mappings, indexed by the receiver's nullability
1370 // and then the result type's nullability.
1371 static const uint8_t None = 0;
1372 static const uint8_t NonNull = 1;
1373 static const uint8_t Nullable = 2;
1374 static const uint8_t Unspecified = 3;
1375 static const uint8_t nullabilityMap[4][4] = {
1376 // None NonNull Nullable Unspecified
1377 /* None */ { None, None, Nullable, None },
1378 /* NonNull */ { None, NonNull, Nullable, Unspecified },
1379 /* Nullable */ { Nullable, Nullable, Nullable, Nullable },
1380 /* Unspecified */ { None, Unspecified, Nullable, Unspecified }
1381 };
1382
1383 unsigned newResultNullabilityIdx
1384 = nullabilityMap[receiverNullabilityIdx][resultNullabilityIdx];
1385 if (newResultNullabilityIdx == resultNullabilityIdx)
1386 return resultType;
1387
1388 // Strip off the existing nullability. This removes as little type sugar as
1389 // possible.
1390 do {
1391 if (auto attributed = dyn_cast<AttributedType>(resultType.getTypePtr())) {
1392 resultType = attributed->getModifiedType();
1393 } else {
1394 resultType = resultType.getDesugaredType(Context);
1395 }
1396 } while (resultType->getNullability(Context));
1397
1398 // Add nullability back if needed.
1399 if (newResultNullabilityIdx > 0) {
1400 auto newNullability
1401 = static_cast<NullabilityKind>(newResultNullabilityIdx-1);
1402 return Context.getAttributedType(
1403 AttributedType::getNullabilityAttrKind(newNullability),
1404 resultType, resultType);
1405 }
1406
1407 return resultType;
1408}
1409
1410/// Look for an ObjC method whose result type exactly matches the given type.
1411static const ObjCMethodDecl *
1412findExplicitInstancetypeDeclarer(const ObjCMethodDecl *MD,
1413 QualType instancetype) {
1414 if (MD->getReturnType() == instancetype)
1415 return MD;
1416
1417 // For these purposes, a method in an @implementation overrides a
1418 // declaration in the @interface.
1419 if (const ObjCImplDecl *impl =
1420 dyn_cast<ObjCImplDecl>(MD->getDeclContext())) {
1421 const ObjCContainerDecl *iface;
1422 if (const ObjCCategoryImplDecl *catImpl =
1423 dyn_cast<ObjCCategoryImplDecl>(impl)) {
1424 iface = catImpl->getCategoryDecl();
1425 } else {
1426 iface = impl->getClassInterface();
1427 }
1428
1429 const ObjCMethodDecl *ifaceMD =
1430 iface->getMethod(MD->getSelector(), MD->isInstanceMethod());
1431 if (ifaceMD) return findExplicitInstancetypeDeclarer(ifaceMD, instancetype);
1432 }
1433
1434 SmallVector<const ObjCMethodDecl *, 4> overrides;
1435 MD->getOverriddenMethods(overrides);
1436 for (unsigned i = 0, e = overrides.size(); i != e; ++i) {
1437 if (const ObjCMethodDecl *result =
1438 findExplicitInstancetypeDeclarer(overrides[i], instancetype))
1439 return result;
1440 }
1441
1442 return nullptr;
1443}
1444
1445void Sema::EmitRelatedResultTypeNoteForReturn(QualType destType) {
1446 // Only complain if we're in an ObjC method and the required return
1447 // type doesn't match the method's declared return type.
1448 ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurContext);
1449 if (!MD || !MD->hasRelatedResultType() ||
1450 Context.hasSameUnqualifiedType(destType, MD->getReturnType()))
1451 return;
1452
1453 // Look for a method overridden by this method which explicitly uses
1454 // 'instancetype'.
1455 if (const ObjCMethodDecl *overridden =
1456 findExplicitInstancetypeDeclarer(MD, Context.getObjCInstanceType())) {
1457 SourceRange range = overridden->getReturnTypeSourceRange();
1458 SourceLocation loc = range.getBegin();
1459 if (loc.isInvalid())
1460 loc = overridden->getLocation();
1461 Diag(loc, diag::note_related_result_type_explicit)
1462 << /*current method*/ 1 << range;
1463 return;
1464 }
1465
1466 // Otherwise, if we have an interesting method family, note that.
1467 // This should always trigger if the above didn't.
1468 if (ObjCMethodFamily family = MD->getMethodFamily())
1469 Diag(MD->getLocation(), diag::note_related_result_type_family)
1470 << /*current method*/ 1
1471 << family;
1472}
1473
1474void Sema::EmitRelatedResultTypeNote(const Expr *E) {
1475 E = E->IgnoreParenImpCasts();
1476 const ObjCMessageExpr *MsgSend = dyn_cast<ObjCMessageExpr>(E);
1477 if (!MsgSend)
1478 return;
1479
1480 const ObjCMethodDecl *Method = MsgSend->getMethodDecl();
1481 if (!Method)
1482 return;
1483
1484 if (!Method->hasRelatedResultType())
1485 return;
1486
1487 if (Context.hasSameUnqualifiedType(
1488 Method->getReturnType().getNonReferenceType(), MsgSend->getType()))
1489 return;
1490
1491 if (!Context.hasSameUnqualifiedType(Method->getReturnType(),
1492 Context.getObjCInstanceType()))
1493 return;
1494
1495 Diag(Method->getLocation(), diag::note_related_result_type_inferred)
1496 << Method->isInstanceMethod() << Method->getSelector()
1497 << MsgSend->getType();
1498}
1499
1500bool Sema::CheckMessageArgumentTypes(QualType ReceiverType,
1501 MultiExprArg Args,
1502 Selector Sel,
1503 ArrayRef<SourceLocation> SelectorLocs,
1504 ObjCMethodDecl *Method,
1505 bool isClassMessage, bool isSuperMessage,
1506 SourceLocation lbrac, SourceLocation rbrac,
1507 SourceRange RecRange,
1508 QualType &ReturnType, ExprValueKind &VK) {
1509 SourceLocation SelLoc;
1510 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
1511 SelLoc = SelectorLocs.front();
1512 else
1513 SelLoc = lbrac;
1514
1515 if (!Method) {
1516 // Apply default argument promotion as for (C99 6.5.2.2p6).
1517 for (unsigned i = 0, e = Args.size(); i != e; i++) {
1518 if (Args[i]->isTypeDependent())
1519 continue;
1520
1521 ExprResult result;
1522 if (getLangOpts().DebuggerSupport) {
1523 QualType paramTy; // ignored
1524 result = checkUnknownAnyArg(SelLoc, Args[i], paramTy);
1525 } else {
1526 result = DefaultArgumentPromotion(Args[i]);
1527 }
1528 if (result.isInvalid())
1529 return true;
1530 Args[i] = result.get();
1531 }
1532
1533 unsigned DiagID;
1534 if (getLangOpts().ObjCAutoRefCount)
1535 DiagID = diag::err_arc_method_not_found;
1536 else
1537 DiagID = isClassMessage ? diag::warn_class_method_not_found
1538 : diag::warn_inst_method_not_found;
1539 if (!getLangOpts().DebuggerSupport) {
1540 const ObjCMethodDecl *OMD = SelectorsForTypoCorrection(Sel, ReceiverType);
1541 if (OMD && !OMD->isInvalidDecl()) {
1542 if (getLangOpts().ObjCAutoRefCount)
1543 DiagID = diag::err_method_not_found_with_typo;
1544 else
1545 DiagID = isClassMessage ? diag::warn_class_method_not_found_with_typo
1546 : diag::warn_instance_method_not_found_with_typo;
1547 Selector MatchedSel = OMD->getSelector();
1548 SourceRange SelectorRange(SelectorLocs.front(), SelectorLocs.back());
1549 if (MatchedSel.isUnarySelector())
1550 Diag(SelLoc, DiagID)
1551 << Sel<< isClassMessage << MatchedSel
1552 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1553 else
1554 Diag(SelLoc, DiagID) << Sel<< isClassMessage << MatchedSel;
1555 }
1556 else
1557 Diag(SelLoc, DiagID)
1558 << Sel << isClassMessage << SourceRange(SelectorLocs.front(),
1559 SelectorLocs.back());
1560 // Find the class to which we are sending this message.
1561 if (ReceiverType->isObjCObjectPointerType()) {
1562 if (ObjCInterfaceDecl *ThisClass =
1563 ReceiverType->getAs<ObjCObjectPointerType>()->getInterfaceDecl()) {
1564 Diag(ThisClass->getLocation(), diag::note_receiver_class_declared);
1565 if (!RecRange.isInvalid())
1566 if (ThisClass->lookupClassMethod(Sel))
1567 Diag(RecRange.getBegin(),diag::note_receiver_expr_here)
1568 << FixItHint::CreateReplacement(RecRange,
1569 ThisClass->getNameAsString());
1570 }
1571 }
1572 }
1573
1574 // In debuggers, we want to use __unknown_anytype for these
1575 // results so that clients can cast them.
1576 if (getLangOpts().DebuggerSupport) {
1577 ReturnType = Context.UnknownAnyTy;
1578 } else {
1579 ReturnType = Context.getObjCIdType();
1580 }
1581 VK = VK_RValue;
1582 return false;
1583 }
1584
1585 ReturnType = getMessageSendResultType(ReceiverType, Method, isClassMessage,
1586 isSuperMessage);
1587 VK = Expr::getValueKindForType(Method->getReturnType());
1588
1589 unsigned NumNamedArgs = Sel.getNumArgs();
1590 // Method might have more arguments than selector indicates. This is due
1591 // to addition of c-style arguments in method.
1592 if (Method->param_size() > Sel.getNumArgs())
1593 NumNamedArgs = Method->param_size();
1594 // FIXME. This need be cleaned up.
1595 if (Args.size() < NumNamedArgs) {
1596 Diag(SelLoc, diag::err_typecheck_call_too_few_args)
1597 << 2 << NumNamedArgs << static_cast<unsigned>(Args.size());
1598 return false;
1599 }
1600
1601 // Compute the set of type arguments to be substituted into each parameter
1602 // type.
1603 Optional<ArrayRef<QualType>> typeArgs
1604 = ReceiverType->getObjCSubstitutions(Method->getDeclContext());
1605 bool IsError = false;
1606 for (unsigned i = 0; i < NumNamedArgs; i++) {
1607 // We can't do any type-checking on a type-dependent argument.
1608 if (Args[i]->isTypeDependent())
1609 continue;
1610
1611 Expr *argExpr = Args[i];
1612
1613 ParmVarDecl *param = Method->parameters()[i];
1614 assert(argExpr && "CheckMessageArgumentTypes(): missing expression")(static_cast <bool> (argExpr && "CheckMessageArgumentTypes(): missing expression"
) ? void (0) : __assert_fail ("argExpr && \"CheckMessageArgumentTypes(): missing expression\""
, "/build/llvm-toolchain-snapshot-7~svn337490/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 1614, __extension__ __PRETTY_FUNCTION__))
;
1615
1616 if (param->hasAttr<NoEscapeAttr>())
1617 if (auto *BE = dyn_cast<BlockExpr>(
1618 argExpr->IgnoreParenNoopCasts(Context)))
1619 BE->getBlockDecl()->setDoesNotEscape();
1620
1621 // Strip the unbridged-cast placeholder expression off unless it's
1622 // a consumed argument.
1623 if (argExpr->hasPlaceholderType(BuiltinType::ARCUnbridgedCast) &&
1624 !param->hasAttr<CFConsumedAttr>())
1625 argExpr = stripARCUnbridgedCast(argExpr);
1626
1627 // If the parameter is __unknown_anytype, infer its type
1628 // from the argument.
1629 if (param->getType() == Context.UnknownAnyTy) {
1630 QualType paramType;
1631 ExprResult argE = checkUnknownAnyArg(SelLoc, argExpr, paramType);
1632 if (argE.isInvalid()) {
1633 IsError = true;
1634 } else {
1635 Args[i] = argE.get();
1636
1637 // Update the parameter type in-place.
1638 param->setType(paramType);
1639 }
1640 continue;
1641 }
1642
1643 QualType origParamType = param->getType();
1644 QualType paramType = param->getType();
1645 if (typeArgs)
1646 paramType = paramType.substObjCTypeArgs(
1647 Context,
1648 *typeArgs,
1649 ObjCSubstitutionContext::Parameter);
1650
1651 if (RequireCompleteType(argExpr->getSourceRange().getBegin(),
1652 paramType,
1653 diag::err_call_incomplete_argument, argExpr))
1654 return true;
1655
1656 InitializedEntity Entity
1657 = InitializedEntity::InitializeParameter(Context, param, paramType);
1658 ExprResult ArgE = PerformCopyInitialization(Entity, SourceLocation(), argExpr);
1659 if (ArgE.isInvalid())
1660 IsError = true;
1661 else {
1662 Args[i] = ArgE.getAs<Expr>();
1663
1664 // If we are type-erasing a block to a block-compatible
1665 // Objective-C pointer type, we may need to extend the lifetime
1666 // of the block object.
1667 if (typeArgs && Args[i]->isRValue() && paramType->isBlockPointerType() &&
1668 Args[i]->getType()->isBlockPointerType() &&
1669 origParamType->isObjCObjectPointerType()) {
1670 ExprResult arg = Args[i];
1671 maybeExtendBlockObject(arg);
1672 Args[i] = arg.get();
1673 }
1674 }
1675 }
1676
1677 // Promote additional arguments to variadic methods.
1678 if (Method->isVariadic()) {
1679 for (unsigned i = NumNamedArgs, e = Args.size(); i < e; ++i) {
1680 if (Args[i]->isTypeDependent())
1681 continue;
1682
1683 ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], VariadicMethod,
1684 nullptr);
1685 IsError |= Arg.isInvalid();
1686 Args[i] = Arg.get();
1687 }
1688 } else {
1689 // Check for extra arguments to non-variadic methods.
1690 if (Args.size() != NumNamedArgs) {
1691 Diag(Args[NumNamedArgs]->getLocStart(),
1692 diag::err_typecheck_call_too_many_args)
1693 << 2 /*method*/ << NumNamedArgs << static_cast<unsigned>(Args.size())
1694 << Method->getSourceRange()
1695 << SourceRange(Args[NumNamedArgs]->getLocStart(),
1696 Args.back()->getLocEnd());
1697 }
1698 }
1699
1700 DiagnoseSentinelCalls(Method, SelLoc, Args);
1701
1702 // Do additional checkings on method.
1703 IsError |= CheckObjCMethodCall(
1704 Method, SelLoc, makeArrayRef(Args.data(), Args.size()));
1705
1706 return IsError;
1707}
1708
1709bool Sema::isSelfExpr(Expr *RExpr) {
1710 // 'self' is objc 'self' in an objc method only.
1711 ObjCMethodDecl *Method =
1712 dyn_cast_or_null<ObjCMethodDecl>(CurContext->getNonClosureAncestor());
1713 return isSelfExpr(RExpr, Method);
1714}
1715
1716bool Sema::isSelfExpr(Expr *receiver, const ObjCMethodDecl *method) {
1717 if (!method) return false;
1718
1719 receiver = receiver->IgnoreParenLValueCasts();
1720 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(receiver))
1721 if (DRE->getDecl() == method->getSelfDecl())
1722 return true;
1723 return false;
1724}
1725
1726/// LookupMethodInType - Look up a method in an ObjCObjectType.
1727ObjCMethodDecl *Sema::LookupMethodInObjectType(Selector sel, QualType type,
1728 bool isInstance) {
1729 const ObjCObjectType *objType = type->castAs<ObjCObjectType>();
1730 if (ObjCInterfaceDecl *iface = objType->getInterface()) {
1731 // Look it up in the main interface (and categories, etc.)
1732 if (ObjCMethodDecl *method = iface->lookupMethod(sel, isInstance))
1733 return method;
1734
1735 // Okay, look for "private" methods declared in any
1736 // @implementations we've seen.
1737 if (ObjCMethodDecl *method = iface->lookupPrivateMethod(sel, isInstance))
1738 return method;
1739 }
1740
1741 // Check qualifiers.
1742 for (const auto *I : objType->quals())
1743 if (ObjCMethodDecl *method = I->lookupMethod(sel, isInstance))
1744 return method;
1745
1746 return nullptr;
1747}
1748
1749/// LookupMethodInQualifiedType - Lookups up a method in protocol qualifier
1750/// list of a qualified objective pointer type.
1751ObjCMethodDecl *Sema::LookupMethodInQualifiedType(Selector Sel,
1752 const ObjCObjectPointerType *OPT,
1753 bool Instance)
1754{
1755 ObjCMethodDecl *MD = nullptr;
1756 for (const auto *PROTO : OPT->quals()) {
1757 if ((MD = PROTO->lookupMethod(Sel, Instance))) {
1758 return MD;
1759 }
1760 }
1761 return nullptr;
1762}
1763
1764/// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an
1765/// objective C interface. This is a property reference expression.
1766ExprResult Sema::
1767HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT,
1768 Expr *BaseExpr, SourceLocation OpLoc,
1769 DeclarationName MemberName,
1770 SourceLocation MemberLoc,
1771 SourceLocation SuperLoc, QualType SuperType,
1772 bool Super) {
1773 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType();
1774 ObjCInterfaceDecl *IFace = IFaceT->getDecl();
1775
1776 if (!MemberName.isIdentifier()) {
1777 Diag(MemberLoc, diag::err_invalid_property_name)
1778 << MemberName << QualType(OPT, 0);
1779 return ExprError();
1780 }
1781
1782 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
1783
1784 SourceRange BaseRange = Super? SourceRange(SuperLoc)
1785 : BaseExpr->getSourceRange();
1786 if (RequireCompleteType(MemberLoc, OPT->getPointeeType(),
1787 diag::err_property_not_found_forward_class,
1788 MemberName, BaseRange))
1789 return ExprError();
1790
1791 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(
1792 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1793 // Check whether we can reference this property.
1794 if (DiagnoseUseOfDecl(PD, MemberLoc))
1795 return ExprError();
1796 if (Super)
1797 return new (Context)
1798 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1799 OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1800 else
1801 return new (Context)
1802 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1803 OK_ObjCProperty, MemberLoc, BaseExpr);
1804 }
1805 // Check protocols on qualified interfaces.
1806 for (const auto *I : OPT->quals())
1807 if (ObjCPropertyDecl *PD = I->FindPropertyDeclaration(
1808 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1809 // Check whether we can reference this property.
1810 if (DiagnoseUseOfDecl(PD, MemberLoc))
1811 return ExprError();
1812
1813 if (Super)
1814 return new (Context) ObjCPropertyRefExpr(
1815 PD, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty, MemberLoc,
1816 SuperLoc, SuperType);
1817 else
1818 return new (Context)
1819 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1820 OK_ObjCProperty, MemberLoc, BaseExpr);
1821 }
1822 // If that failed, look for an "implicit" property by seeing if the nullary
1823 // selector is implemented.
1824
1825 // FIXME: The logic for looking up nullary and unary selectors should be
1826 // shared with the code in ActOnInstanceMessage.
1827
1828 Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
1829 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
1830
1831 // May be found in property's qualified list.
1832 if (!Getter)
1833 Getter = LookupMethodInQualifiedType(Sel, OPT, true);
1834
1835 // If this reference is in an @implementation, check for 'private' methods.
1836 if (!Getter)
1837 Getter = IFace->lookupPrivateMethod(Sel);
1838
1839 if (Getter) {
1840 // Check if we can reference this property.
1841 if (DiagnoseUseOfDecl(Getter, MemberLoc))
1842 return ExprError();
1843 }
1844 // If we found a getter then this may be a valid dot-reference, we
1845 // will look for the matching setter, in case it is needed.
1846 Selector SetterSel =
1847 SelectorTable::constructSetterSelector(PP.getIdentifierTable(),
1848 PP.getSelectorTable(), Member);
1849 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel);
1850
1851 // May be found in property's qualified list.
1852 if (!Setter)
1853 Setter = LookupMethodInQualifiedType(SetterSel, OPT, true);
1854
1855 if (!Setter) {
1856 // If this reference is in an @implementation, also check for 'private'
1857 // methods.
1858 Setter = IFace->lookupPrivateMethod(SetterSel);
1859 }
1860
1861 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc))
1862 return ExprError();
1863
1864 // Special warning if member name used in a property-dot for a setter accessor
1865 // does not use a property with same name; e.g. obj.X = ... for a property with
1866 // name 'x'.
1867 if (Setter && Setter->isImplicit() && Setter->isPropertyAccessor() &&
1868 !IFace->FindPropertyDeclaration(
1869 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1870 if (const ObjCPropertyDecl *PDecl = Setter->findPropertyDecl()) {
1871 // Do not warn if user is using property-dot syntax to make call to
1872 // user named setter.
1873 if (!(PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter))
1874 Diag(MemberLoc,
1875 diag::warn_property_access_suggest)
1876 << MemberName << QualType(OPT, 0) << PDecl->getName()
1877 << FixItHint::CreateReplacement(MemberLoc, PDecl->getName());
1878 }
1879 }
1880
1881 if (Getter || Setter) {
1882 if (Super)
1883 return new (Context)
1884 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1885 OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1886 else
1887 return new (Context)
1888 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1889 OK_ObjCProperty, MemberLoc, BaseExpr);
1890
1891 }
1892
1893 // Attempt to correct for typos in property names.
1894 if (TypoCorrection Corrected =
1895 CorrectTypo(DeclarationNameInfo(MemberName, MemberLoc),
1896 LookupOrdinaryName, nullptr, nullptr,
1897 llvm::make_unique<DeclFilterCCC<ObjCPropertyDecl>>(),
1898 CTK_ErrorRecovery, IFace, false, OPT)) {
1899 DeclarationName TypoResult = Corrected.getCorrection();
1900 if (TypoResult.isIdentifier() &&
1901 TypoResult.getAsIdentifierInfo() == Member) {
1902 // There is no need to try the correction if it is the same.
1903 NamedDecl *ChosenDecl =
1904 Corrected.isKeyword() ? nullptr : Corrected.getFoundDecl();
1905 if (ChosenDecl && isa<ObjCPropertyDecl>(ChosenDecl))
1906 if (cast<ObjCPropertyDecl>(ChosenDecl)->isClassProperty()) {
1907 // This is a class property, we should not use the instance to
1908 // access it.
1909 Diag(MemberLoc, diag::err_class_property_found) << MemberName
1910 << OPT->getInterfaceDecl()->getName()
1911 << FixItHint::CreateReplacement(BaseExpr->getSourceRange(),
1912 OPT->getInterfaceDecl()->getName());
1913 return ExprError();
1914 }
1915 } else {
1916 diagnoseTypo(Corrected, PDiag(diag::err_property_not_found_suggest)
1917 << MemberName << QualType(OPT, 0));
1918 return HandleExprPropertyRefExpr(OPT, BaseExpr, OpLoc,
1919 TypoResult, MemberLoc,
1920 SuperLoc, SuperType, Super);
1921 }
1922 }
1923 ObjCInterfaceDecl *ClassDeclared;
1924 if (ObjCIvarDecl *Ivar =
1925 IFace->lookupInstanceVariable(Member, ClassDeclared)) {
1926 QualType T = Ivar->getType();
1927 if (const ObjCObjectPointerType * OBJPT =
1928 T->getAsObjCInterfacePointerType()) {
1929 if (RequireCompleteType(MemberLoc, OBJPT->getPointeeType(),
1930 diag::err_property_not_as_forward_class,
1931 MemberName, BaseExpr))
1932 return ExprError();
1933 }
1934 Diag(MemberLoc,
1935 diag::err_ivar_access_using_property_syntax_suggest)
1936 << MemberName << QualType(OPT, 0) << Ivar->getDeclName()
1937 << FixItHint::CreateReplacement(OpLoc, "->");
1938 return ExprError();
1939 }
1940
1941 Diag(MemberLoc, diag::err_property_not_found)
1942 << MemberName << QualType(OPT, 0);
1943 if (Setter)
1944 Diag(Setter->getLocation(), diag::note_getter_unavailable)
1945 << MemberName << BaseExpr->getSourceRange();
1946 return ExprError();
1947}
1948
1949ExprResult Sema::
1950ActOnClassPropertyRefExpr(IdentifierInfo &receiverName,
1951 IdentifierInfo &propertyName,
1952 SourceLocation receiverNameLoc,
1953 SourceLocation propertyNameLoc) {
1954
1955 IdentifierInfo *receiverNamePtr = &receiverName;
1956 ObjCInterfaceDecl *IFace = getObjCInterfaceDecl(receiverNamePtr,
1957 receiverNameLoc);
1958
1959 QualType SuperType;
1960 if (!IFace) {
1961 // If the "receiver" is 'super' in a method, handle it as an expression-like
1962 // property reference.
1963 if (receiverNamePtr->isStr("super")) {
1964 if (ObjCMethodDecl *CurMethod = tryCaptureObjCSelf(receiverNameLoc)) {
1965 if (auto classDecl = CurMethod->getClassInterface()) {
1966 SuperType = QualType(classDecl->getSuperClassType(), 0);
1967 if (CurMethod->isInstanceMethod()) {
1968 if (SuperType.isNull()) {
1969 // The current class does not have a superclass.
1970 Diag(receiverNameLoc, diag::err_root_class_cannot_use_super)
1971 << CurMethod->getClassInterface()->getIdentifier();
1972 return ExprError();
1973 }
1974 QualType T = Context.getObjCObjectPointerType(SuperType);
1975
1976 return HandleExprPropertyRefExpr(T->castAs<ObjCObjectPointerType>(),
1977 /*BaseExpr*/nullptr,
1978 SourceLocation()/*OpLoc*/,
1979 &propertyName,
1980 propertyNameLoc,
1981 receiverNameLoc, T, true);
1982 }
1983
1984 // Otherwise, if this is a class method, try dispatching to our
1985 // superclass.
1986 IFace = CurMethod->getClassInterface()->getSuperClass();
1987 }
1988 }
1989 }
1990
1991 if (!IFace) {
1992 Diag(receiverNameLoc, diag::err_expected_either) << tok::identifier
1993 << tok::l_paren;
1994 return ExprError();
1995 }
1996 }
1997
1998 Selector GetterSel;
1999 Selector SetterSel;
2000 if (auto PD = IFace->FindPropertyDeclaration(
2001 &propertyName, ObjCPropertyQueryKind::OBJC_PR_query_class)) {
2002 GetterSel = PD->getGetterName();
2003 SetterSel = PD->getSetterName();
2004 } else {
2005 GetterSel = PP.getSelectorTable().getNullarySelector(&propertyName);
2006 SetterSel = SelectorTable::constructSetterSelector(
2007 PP.getIdentifierTable(), PP.getSelectorTable(), &propertyName);
2008 }
2009
2010 // Search for a declared property first.
2011 ObjCMethodDecl *Getter = IFace->lookupClassMethod(GetterSel);
2012
2013 // If this reference is in an @implementation, check for 'private' methods.
2014 if (!Getter)
2015 Getter = IFace->lookupPrivateClassMethod(GetterSel);
2016
2017 if (Getter) {
2018 // FIXME: refactor/share with ActOnMemberReference().
2019 // Check if we can reference this property.
2020 if (DiagnoseUseOfDecl(Getter, propertyNameLoc))
2021 return ExprError();
2022 }
2023
2024 // Look for the matching setter, in case it is needed.
2025 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel);
2026 if (!Setter) {
2027 // If this reference is in an @implementation, also check for 'private'
2028 // methods.
2029 Setter = IFace->lookupPrivateClassMethod(SetterSel);
2030 }
2031 // Look through local category implementations associated with the class.
2032 if (!Setter)
2033 Setter = IFace->getCategoryClassMethod(SetterSel);
2034
2035 if (Setter && DiagnoseUseOfDecl(Setter, propertyNameLoc))
2036 return ExprError();
2037
2038 if (Getter || Setter) {
2039 if (!SuperType.isNull())
2040 return new (Context)
2041 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
2042 OK_ObjCProperty, propertyNameLoc, receiverNameLoc,
2043 SuperType);
2044
2045 return new (Context) ObjCPropertyRefExpr(
2046 Getter, Setter, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty,
2047 propertyNameLoc, receiverNameLoc, IFace);
2048 }
2049 return ExprError(Diag(propertyNameLoc, diag::err_property_not_found)
2050 << &propertyName << Context.getObjCInterfaceType(IFace));
2051}
2052
2053namespace {
2054
2055class ObjCInterfaceOrSuperCCC : public CorrectionCandidateCallback {
2056 public:
2057 ObjCInterfaceOrSuperCCC(ObjCMethodDecl *Method) {
2058 // Determine whether "super" is acceptable in the current context.
2059 if (Method && Method->getClassInterface())
2060 WantObjCSuper = Method->getClassInterface()->getSuperClass();
2061 }
2062
2063 bool ValidateCandidate(const TypoCorrection &candidate) override {
2064 return candidate.getCorrectionDeclAs<ObjCInterfaceDecl>() ||
2065 candidate.isKeyword("super");
2066 }
2067};
2068
2069} // end anonymous namespace
2070
2071Sema::ObjCMessageKind Sema::getObjCMessageKind(Scope *S,
2072 IdentifierInfo *Name,
2073 SourceLocation NameLoc,
2074 bool IsSuper,
2075 bool HasTrailingDot,
2076 ParsedType &ReceiverType) {
2077 ReceiverType = nullptr;
2078
2079 // If the identifier is "super" and there is no trailing dot, we're
2080 // messaging super. If the identifier is "super" and there is a
2081 // trailing dot, it's an instance message.
2082 if (IsSuper && S->isInObjcMethodScope())
2083 return HasTrailingDot? ObjCInstanceMessage : ObjCSuperMessage;
2084
2085 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName);
2086 LookupName(Result, S);
2087
2088 switch (Result.getResultKind()) {
2089 case LookupResult::NotFound:
2090 // Normal name lookup didn't find anything. If we're in an
2091 // Objective-C method, look for ivars. If we find one, we're done!
2092 // FIXME: This is a hack. Ivar lookup should be part of normal
2093 // lookup.
2094 if (ObjCMethodDecl *Method = getCurMethodDecl()) {
2095 if (!Method->getClassInterface()) {
2096 // Fall back: let the parser try to parse it as an instance message.
2097 return ObjCInstanceMessage;
2098 }
2099
2100 ObjCInterfaceDecl *ClassDeclared;
2101 if (Method->getClassInterface()->lookupInstanceVariable(Name,
2102 ClassDeclared))
2103 return ObjCInstanceMessage;
2104 }
2105
2106 // Break out; we'll perform typo correction below.
2107 break;
2108
2109 case LookupResult::NotFoundInCurrentInstantiation:
2110 case LookupResult::FoundOverloaded:
2111 case LookupResult::FoundUnresolvedValue:
2112 case LookupResult::Ambiguous:
2113 Result.suppressDiagnostics();
2114 return ObjCInstanceMessage;
2115
2116 case LookupResult::Found: {
2117 // If the identifier is a class or not, and there is a trailing dot,
2118 // it's an instance message.
2119 if (HasTrailingDot)
2120 return ObjCInstanceMessage;
2121 // We found something. If it's a type, then we have a class
2122 // message. Otherwise, it's an instance message.
2123 NamedDecl *ND = Result.getFoundDecl();
2124 QualType T;
2125 if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND))
2126 T = Context.getObjCInterfaceType(Class);
2127 else if (TypeDecl *Type = dyn_cast<TypeDecl>(ND)) {
2128 T = Context.getTypeDeclType(Type);
2129 DiagnoseUseOfDecl(Type, NameLoc);
2130 }
2131 else
2132 return ObjCInstanceMessage;
2133
2134 // We have a class message, and T is the type we're
2135 // messaging. Build source-location information for it.
2136 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2137 ReceiverType = CreateParsedType(T, TSInfo);
2138 return ObjCClassMessage;
2139 }
2140 }
2141
2142 if (TypoCorrection Corrected = CorrectTypo(
2143 Result.getLookupNameInfo(), Result.getLookupKind(), S, nullptr,
2144 llvm::make_unique<ObjCInterfaceOrSuperCCC>(getCurMethodDecl()),
2145 CTK_ErrorRecovery, nullptr, false, nullptr, false)) {
2146 if (Corrected.isKeyword()) {
2147 // If we've found the keyword "super" (the only keyword that would be
2148 // returned by CorrectTypo), this is a send to super.
2149 diagnoseTypo(Corrected,
2150 PDiag(diag::err_unknown_receiver_suggest) << Name);
2151 return ObjCSuperMessage;
2152 } else if (ObjCInterfaceDecl *Class =
2153 Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>()) {
2154 // If we found a declaration, correct when it refers to an Objective-C
2155 // class.
2156 diagnoseTypo(Corrected,
2157 PDiag(diag::err_unknown_receiver_suggest) << Name);
2158 QualType T = Context.getObjCInterfaceType(Class);
2159 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2160 ReceiverType = CreateParsedType(T, TSInfo);
2161 return ObjCClassMessage;
2162 }
2163 }
2164
2165 // Fall back: let the parser try to parse it as an instance message.
2166 return ObjCInstanceMessage;
2167}
2168
2169ExprResult Sema::ActOnSuperMessage(Scope *S,
2170 SourceLocation SuperLoc,
2171 Selector Sel,
2172 SourceLocation LBracLoc,
2173 ArrayRef<SourceLocation> SelectorLocs,
2174 SourceLocation RBracLoc,
2175 MultiExprArg Args) {
2176 // Determine whether we are inside a method or not.
2177 ObjCMethodDecl *Method = tryCaptureObjCSelf(SuperLoc);
2178 if (!Method) {
1
Taking false branch
2179 Diag(SuperLoc, diag::err_invalid_receiver_to_message_super);
2180 return ExprError();
2181 }
2182
2183 ObjCInterfaceDecl *Class = Method->getClassInterface();
2184 if (!Class) {
2
Assuming 'Class' is non-null
3
Taking false branch
2185 Diag(SuperLoc, diag::err_no_super_class_message)
2186 << Method->getDeclName();
2187 return ExprError();
2188 }
2189
2190 QualType SuperTy(Class->getSuperClassType(), 0);
2191 if (SuperTy.isNull()) {
4
Taking false branch
2192 // The current class does not have a superclass.
2193 Diag(SuperLoc, diag::err_root_class_cannot_use_super)
2194 << Class->getIdentifier();
2195 return ExprError();
2196 }
2197
2198 // We are in a method whose class has a superclass, so 'super'
2199 // is acting as a keyword.
2200 if (Method->getSelector() == Sel)
5
Taking false branch
2201 getCurFunction()->ObjCShouldCallSuper = false;
2202
2203 if (Method->isInstanceMethod()) {
6
Assuming the condition is false
7
Taking false branch
2204 // Since we are in an instance method, this is an instance
2205 // message to the superclass instance.
2206 SuperTy = Context.getObjCObjectPointerType(SuperTy);
2207 return BuildInstanceMessage(nullptr, SuperTy, SuperLoc,
2208 Sel, /*Method=*/nullptr,
2209 LBracLoc, SelectorLocs, RBracLoc, Args);
2210 }
2211
2212 // Since we are in a class method, this is a class message to
2213 // the superclass.
2214 return BuildClassMessage(/*ReceiverTypeInfo=*/nullptr,
8
Passing null pointer value via 1st parameter 'ReceiverTypeInfo'
9
Calling 'Sema::BuildClassMessage'
2215 SuperTy,
2216 SuperLoc, Sel, /*Method=*/nullptr,
2217 LBracLoc, SelectorLocs, RBracLoc, Args);
2218}
2219
2220ExprResult Sema::BuildClassMessageImplicit(QualType ReceiverType,
2221 bool isSuperReceiver,
2222 SourceLocation Loc,
2223 Selector Sel,
2224 ObjCMethodDecl *Method,
2225 MultiExprArg Args) {
2226 TypeSourceInfo *receiverTypeInfo = nullptr;
2227 if (!ReceiverType.isNull())
2228 receiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType);
2229
2230 return BuildClassMessage(receiverTypeInfo, ReceiverType,
2231 /*SuperLoc=*/isSuperReceiver ? Loc : SourceLocation(),
2232 Sel, Method, Loc, Loc, Loc, Args,
2233 /*isImplicit=*/true);
2234}
2235
2236static void applyCocoaAPICheck(Sema &S, const ObjCMessageExpr *Msg,
2237 unsigned DiagID,
2238 bool (*refactor)(const ObjCMessageExpr *,
2239 const NSAPI &, edit::Commit &)) {
2240 SourceLocation MsgLoc = Msg->getExprLoc();
2241 if (S.Diags.isIgnored(DiagID, MsgLoc))
2242 return;
2243
2244 SourceManager &SM = S.SourceMgr;
2245 edit::Commit ECommit(SM, S.LangOpts);
2246 if (refactor(Msg,*S.NSAPIObj, ECommit)) {
2247 DiagnosticBuilder Builder = S.Diag(MsgLoc, DiagID)
2248 << Msg->getSelector() << Msg->getSourceRange();
2249 // FIXME: Don't emit diagnostic at all if fixits are non-commitable.
2250 if (!ECommit.isCommitable())
2251 return;
2252 for (edit::Commit::edit_iterator
2253 I = ECommit.edit_begin(), E = ECommit.edit_end(); I != E; ++I) {
2254 const edit::Commit::Edit &Edit = *I;
2255 switch (Edit.Kind) {
2256 case edit::Commit::Act_Insert:
2257 Builder.AddFixItHint(FixItHint::CreateInsertion(Edit.OrigLoc,
2258 Edit.Text,
2259 Edit.BeforePrev));
2260 break;
2261 case edit::Commit::Act_InsertFromRange:
2262 Builder.AddFixItHint(
2263 FixItHint::CreateInsertionFromRange(Edit.OrigLoc,
2264 Edit.getInsertFromRange(SM),
2265 Edit.BeforePrev));
2266 break;
2267 case edit::Commit::Act_Remove:
2268 Builder.AddFixItHint(FixItHint::CreateRemoval(Edit.getFileRange(SM)));
2269 break;
2270 }
2271 }
2272 }
2273}
2274
2275static void checkCocoaAPI(Sema &S, const ObjCMessageExpr *Msg) {
2276 applyCocoaAPICheck(S, Msg, diag::warn_objc_redundant_literal_use,
2277 edit::rewriteObjCRedundantCallWithLiteral);
2278}
2279
2280static void checkFoundationAPI(Sema &S, SourceLocation Loc,
2281 const ObjCMethodDecl *Method,
2282 ArrayRef<Expr *> Args, QualType ReceiverType,
2283 bool IsClassObjectCall) {
2284 // Check if this is a performSelector method that uses a selector that returns
2285 // a record or a vector type.
2286 if (Method->getSelector().getMethodFamily() != OMF_performSelector ||
2287 Args.empty())
2288 return;
2289 const auto *SE = dyn_cast<ObjCSelectorExpr>(Args[0]->IgnoreParens());
2290 if (!SE)
2291 return;
2292 ObjCMethodDecl *ImpliedMethod;
2293 if (!IsClassObjectCall) {
2294 const auto *OPT = ReceiverType->getAs<ObjCObjectPointerType>();
2295 if (!OPT || !OPT->getInterfaceDecl())
2296 return;
2297 ImpliedMethod =
2298 OPT->getInterfaceDecl()->lookupInstanceMethod(SE->getSelector());
2299 if (!ImpliedMethod)
2300 ImpliedMethod =
2301 OPT->getInterfaceDecl()->lookupPrivateMethod(SE->getSelector());
2302 } else {
2303 const auto *IT = ReceiverType->getAs<ObjCInterfaceType>();
2304 if (!IT)
2305 return;
2306 ImpliedMethod = IT->getDecl()->lookupClassMethod(SE->getSelector());
2307 if (!ImpliedMethod)
2308 ImpliedMethod =
2309 IT->getDecl()->lookupPrivateClassMethod(SE->getSelector());
2310 }
2311 if (!ImpliedMethod)
2312 return;
2313 QualType Ret = ImpliedMethod->getReturnType();
2314 if (Ret->isRecordType() || Ret->isVectorType() || Ret->isExtVectorType()) {
2315 QualType Ret = ImpliedMethod->getReturnType();
2316 S.Diag(Loc, diag::warn_objc_unsafe_perform_selector)
2317 << Method->getSelector()
2318 << (!Ret->isRecordType()
2319 ? /*Vector*/ 2
2320 : Ret->isUnionType() ? /*Union*/ 1 : /*Struct*/ 0);
2321 S.Diag(ImpliedMethod->getLocStart(),
2322 diag::note_objc_unsafe_perform_selector_method_declared_here)
2323 << ImpliedMethod->getSelector() << Ret;
2324 }
2325}
2326
2327/// Diagnose use of %s directive in an NSString which is being passed
2328/// as formatting string to formatting method.
2329static void
2330DiagnoseCStringFormatDirectiveInObjCAPI(Sema &S,
2331 ObjCMethodDecl *Method,
2332 Selector Sel,
2333 Expr **Args, unsigned NumArgs) {
2334 unsigned Idx = 0;
2335 bool Format = false;
2336 ObjCStringFormatFamily SFFamily = Sel.getStringFormatFamily();
2337 if (SFFamily == ObjCStringFormatFamily::SFF_NSString) {
2338 Idx = 0;
2339 Format = true;
2340 }
2341 else if (Method) {
2342 for (const auto *I : Method->specific_attrs<FormatAttr>()) {
2343 if (S.GetFormatNSStringIdx(I, Idx)) {
2344 Format = true;
2345 break;
2346 }
2347 }
2348 }
2349 if (!Format || NumArgs <= Idx)
2350 return;
2351
2352 Expr *FormatExpr = Args[Idx];
2353 if (ObjCStringLiteral *OSL =
2354 dyn_cast<ObjCStringLiteral>(FormatExpr->IgnoreParenImpCasts())) {
2355 StringLiteral *FormatString = OSL->getString();
2356 if (S.FormatStringHasSArg(FormatString)) {
2357 S.Diag(FormatExpr->getExprLoc(), diag::warn_objc_cdirective_format_string)
2358 << "%s" << 0 << 0;
2359 if (Method)
2360 S.Diag(Method->getLocation(), diag::note_method_declared_at)
2361 << Method->getDeclName();
2362 }
2363 }
2364}
2365
2366/// Build an Objective-C class message expression.
2367///
2368/// This routine takes care of both normal class messages and
2369/// class messages to the superclass.
2370///
2371/// \param ReceiverTypeInfo Type source information that describes the
2372/// receiver of this message. This may be NULL, in which case we are
2373/// sending to the superclass and \p SuperLoc must be a valid source
2374/// location.
2375
2376/// \param ReceiverType The type of the object receiving the
2377/// message. When \p ReceiverTypeInfo is non-NULL, this is the same
2378/// type as that refers to. For a superclass send, this is the type of
2379/// the superclass.
2380///
2381/// \param SuperLoc The location of the "super" keyword in a
2382/// superclass message.
2383///
2384/// \param Sel The selector to which the message is being sent.
2385///
2386/// \param Method The method that this class message is invoking, if
2387/// already known.
2388///
2389/// \param LBracLoc The location of the opening square bracket ']'.
2390///
2391/// \param RBracLoc The location of the closing square bracket ']'.
2392///
2393/// \param ArgsIn The message arguments.
2394ExprResult Sema::BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo,
2395 QualType ReceiverType,
2396 SourceLocation SuperLoc,
2397 Selector Sel,
2398 ObjCMethodDecl *Method,
2399 SourceLocation LBracLoc,
2400 ArrayRef<SourceLocation> SelectorLocs,
2401 SourceLocation RBracLoc,
2402 MultiExprArg ArgsIn,
2403 bool isImplicit) {
2404 SourceLocation Loc = SuperLoc.isValid()? SuperLoc
10
'?' condition is false
2405 : ReceiverTypeInfo->getTypeLoc().getSourceRange().getBegin();
11
Called C++ object pointer is null
2406 if (LBracLoc.isInvalid()) {
2407 Diag(Loc, diag::err_missing_open_square_message_send)
2408 << FixItHint::CreateInsertion(Loc, "[");
2409 LBracLoc = Loc;
2410 }
2411 ArrayRef<SourceLocation> SelectorSlotLocs;
2412 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2413 SelectorSlotLocs = SelectorLocs;
2414 else
2415 SelectorSlotLocs = Loc;
2416 SourceLocation SelLoc = SelectorSlotLocs.front();
2417
2418 if (ReceiverType->isDependentType()) {
2419 // If the receiver type is dependent, we can't type-check anything
2420 // at this point. Build a dependent expression.
2421 unsigned NumArgs = ArgsIn.size();
2422 Expr **Args = ArgsIn.data();
2423 assert(SuperLoc.isInvalid() && "Message to super with dependent type")(static_cast <bool> (SuperLoc.isInvalid() && "Message to super with dependent type"
) ? void (0) : __assert_fail ("SuperLoc.isInvalid() && \"Message to super with dependent type\""
, "/build/llvm-toolchain-snapshot-7~svn337490/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2423, __extension__ __PRETTY_FUNCTION__))
;
2424 return ObjCMessageExpr::Create(
2425 Context, ReceiverType, VK_RValue, LBracLoc, ReceiverTypeInfo, Sel,
2426 SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs), RBracLoc,
2427 isImplicit);
2428 }
2429
2430 // Find the class to which we are sending this message.
2431 ObjCInterfaceDecl *Class = nullptr;
2432 const ObjCObjectType *ClassType = ReceiverType->getAs<ObjCObjectType>();
2433 if (!ClassType || !(Class = ClassType->getInterface())) {
2434 Diag(Loc, diag::err_invalid_receiver_class_message)
2435 << ReceiverType;
2436 return ExprError();
2437 }
2438 assert(Class && "We don't know which class we're messaging?")(static_cast <bool> (Class && "We don't know which class we're messaging?"
) ? void (0) : __assert_fail ("Class && \"We don't know which class we're messaging?\""
, "/build/llvm-toolchain-snapshot-7~svn337490/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2438, __extension__ __PRETTY_FUNCTION__))
;
2439 // objc++ diagnoses during typename annotation.
2440 if (!getLangOpts().CPlusPlus)
2441 (void)DiagnoseUseOfDecl(Class, SelectorSlotLocs);
2442 // Find the method we are messaging.
2443 if (!Method) {
2444 SourceRange TypeRange
2445 = SuperLoc.isValid()? SourceRange(SuperLoc)
2446 : ReceiverTypeInfo->getTypeLoc().getSourceRange();
2447 if (RequireCompleteType(Loc, Context.getObjCInterfaceType(Class),
2448 (getLangOpts().ObjCAutoRefCount
2449 ? diag::err_arc_receiver_forward_class
2450 : diag::warn_receiver_forward_class),
2451 TypeRange)) {
2452 // A forward class used in messaging is treated as a 'Class'
2453 Method = LookupFactoryMethodInGlobalPool(Sel,
2454 SourceRange(LBracLoc, RBracLoc));
2455 if (Method && !getLangOpts().ObjCAutoRefCount)
2456 Diag(Method->getLocation(), diag::note_method_sent_forward_class)
2457 << Method->getDeclName();
2458 }
2459 if (!Method)
2460 Method = Class->lookupClassMethod(Sel);
2461
2462 // If we have an implementation in scope, check "private" methods.
2463 if (!Method)
2464 Method = Class->lookupPrivateClassMethod(Sel);
2465
2466 if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs))
2467 return ExprError();
2468 }
2469
2470 // Check the argument types and determine the result type.
2471 QualType ReturnType;
2472 ExprValueKind VK = VK_RValue;
2473
2474 unsigned NumArgs = ArgsIn.size();
2475 Expr **Args = ArgsIn.data();
2476 if (CheckMessageArgumentTypes(ReceiverType, MultiExprArg(Args, NumArgs),
2477 Sel, SelectorLocs,
2478 Method, true,
2479 SuperLoc.isValid(), LBracLoc, RBracLoc,
2480 SourceRange(),
2481 ReturnType, VK))
2482 return ExprError();
2483
2484 if (Method && !Method->getReturnType()->isVoidType() &&
2485 RequireCompleteType(LBracLoc, Method->getReturnType(),
2486 diag::err_illegal_message_expr_incomplete_type))
2487 return ExprError();
2488
2489 // Warn about explicit call of +initialize on its own class. But not on 'super'.
2490 if (Method && Method->getMethodFamily() == OMF_initialize) {
2491 if (!SuperLoc.isValid()) {
2492 const ObjCInterfaceDecl *ID =
2493 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext());
2494 if (ID == Class) {
2495 Diag(Loc, diag::warn_direct_initialize_call);
2496 Diag(Method->getLocation(), diag::note_method_declared_at)
2497 << Method->getDeclName();
2498 }
2499 }
2500 else if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2501 // [super initialize] is allowed only within an +initialize implementation
2502 if (CurMeth->getMethodFamily() != OMF_initialize) {
2503 Diag(Loc, diag::warn_direct_super_initialize_call);
2504 Diag(Method->getLocation(), diag::note_method_declared_at)
2505 << Method->getDeclName();
2506 Diag(CurMeth->getLocation(), diag::note_method_declared_at)
2507 << CurMeth->getDeclName();
2508 }
2509 }
2510 }
2511
2512 DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
2513
2514 // Construct the appropriate ObjCMessageExpr.
2515 ObjCMessageExpr *Result;
2516 if (SuperLoc.isValid())
2517 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2518 SuperLoc, /*IsInstanceSuper=*/false,
2519 ReceiverType, Sel, SelectorLocs,
2520 Method, makeArrayRef(Args, NumArgs),
2521 RBracLoc, isImplicit);
2522 else {
2523 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2524 ReceiverTypeInfo, Sel, SelectorLocs,
2525 Method, makeArrayRef(Args, NumArgs),
2526 RBracLoc, isImplicit);
2527 if (!isImplicit)
2528 checkCocoaAPI(*this, Result);
2529 }
2530 if (Method)
2531 checkFoundationAPI(*this, SelLoc, Method, makeArrayRef(Args, NumArgs),
2532 ReceiverType, /*IsClassObjectCall=*/true);
2533 return MaybeBindToTemporary(Result);
2534}
2535
2536// ActOnClassMessage - used for both unary and keyword messages.
2537// ArgExprs is optional - if it is present, the number of expressions
2538// is obtained from Sel.getNumArgs().
2539ExprResult Sema::ActOnClassMessage(Scope *S,
2540 ParsedType Receiver,
2541 Selector Sel,
2542 SourceLocation LBracLoc,
2543 ArrayRef<SourceLocation> SelectorLocs,
2544 SourceLocation RBracLoc,
2545 MultiExprArg Args) {
2546 TypeSourceInfo *ReceiverTypeInfo;
2547 QualType ReceiverType = GetTypeFromParser(Receiver, &ReceiverTypeInfo);
2548 if (ReceiverType.isNull())
2549 return ExprError();
2550
2551 if (!ReceiverTypeInfo)
2552 ReceiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType, LBracLoc);
2553
2554 return BuildClassMessage(ReceiverTypeInfo, ReceiverType,
2555 /*SuperLoc=*/SourceLocation(), Sel,
2556 /*Method=*/nullptr, LBracLoc, SelectorLocs, RBracLoc,
2557 Args);
2558}
2559
2560ExprResult Sema::BuildInstanceMessageImplicit(Expr *Receiver,
2561 QualType ReceiverType,
2562 SourceLocation Loc,
2563 Selector Sel,
2564 ObjCMethodDecl *Method,
2565 MultiExprArg Args) {
2566 return BuildInstanceMessage(Receiver, ReceiverType,
2567 /*SuperLoc=*/!Receiver ? Loc : SourceLocation(),
2568 Sel, Method, Loc, Loc, Loc, Args,
2569 /*isImplicit=*/true);
2570}
2571
2572static bool isMethodDeclaredInRootProtocol(Sema &S, const ObjCMethodDecl *M) {
2573 if (!S.NSAPIObj)
2574 return false;
2575 const auto *Protocol = dyn_cast<ObjCProtocolDecl>(M->getDeclContext());
2576 if (!Protocol)
2577 return false;
2578 const IdentifierInfo *II = S.NSAPIObj->getNSClassId(NSAPI::ClassId_NSObject);
2579 if (const auto *RootClass = dyn_cast_or_null<ObjCInterfaceDecl>(
2580 S.LookupSingleName(S.TUScope, II, Protocol->getLocStart(),
2581 Sema::LookupOrdinaryName))) {
2582 for (const ObjCProtocolDecl *P : RootClass->all_referenced_protocols()) {
2583 if (P->getCanonicalDecl() == Protocol->getCanonicalDecl())
2584 return true;
2585 }
2586 }
2587 return false;
2588}
2589
2590/// Build an Objective-C instance message expression.
2591///
2592/// This routine takes care of both normal instance messages and
2593/// instance messages to the superclass instance.
2594///
2595/// \param Receiver The expression that computes the object that will
2596/// receive this message. This may be empty, in which case we are
2597/// sending to the superclass instance and \p SuperLoc must be a valid
2598/// source location.
2599///
2600/// \param ReceiverType The (static) type of the object receiving the
2601/// message. When a \p Receiver expression is provided, this is the
2602/// same type as that expression. For a superclass instance send, this
2603/// is a pointer to the type of the superclass.
2604///
2605/// \param SuperLoc The location of the "super" keyword in a
2606/// superclass instance message.
2607///
2608/// \param Sel The selector to which the message is being sent.
2609///
2610/// \param Method The method that this instance message is invoking, if
2611/// already known.
2612///
2613/// \param LBracLoc The location of the opening square bracket ']'.
2614///
2615/// \param RBracLoc The location of the closing square bracket ']'.
2616///
2617/// \param ArgsIn The message arguments.
2618ExprResult Sema::BuildInstanceMessage(Expr *Receiver,
2619 QualType ReceiverType,
2620 SourceLocation SuperLoc,
2621 Selector Sel,
2622 ObjCMethodDecl *Method,
2623 SourceLocation LBracLoc,
2624 ArrayRef<SourceLocation> SelectorLocs,
2625 SourceLocation RBracLoc,
2626 MultiExprArg ArgsIn,
2627 bool isImplicit) {
2628 assert((Receiver || SuperLoc.isValid()) && "If the Receiver is null, the "(static_cast <bool> ((Receiver || SuperLoc.isValid()) &&
"If the Receiver is null, the " "SuperLoc must be valid so we can "
"use it instead.") ? void (0) : __assert_fail ("(Receiver || SuperLoc.isValid()) && \"If the Receiver is null, the \" \"SuperLoc must be valid so we can \" \"use it instead.\""
, "/build/llvm-toolchain-snapshot-7~svn337490/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2630, __extension__ __PRETTY_FUNCTION__))
2629 "SuperLoc must be valid so we can "(static_cast <bool> ((Receiver || SuperLoc.isValid()) &&
"If the Receiver is null, the " "SuperLoc must be valid so we can "
"use it instead.") ? void (0) : __assert_fail ("(Receiver || SuperLoc.isValid()) && \"If the Receiver is null, the \" \"SuperLoc must be valid so we can \" \"use it instead.\""
, "/build/llvm-toolchain-snapshot-7~svn337490/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2630, __extension__ __PRETTY_FUNCTION__))
2630 "use it instead.")(static_cast <bool> ((Receiver || SuperLoc.isValid()) &&
"If the Receiver is null, the " "SuperLoc must be valid so we can "
"use it instead.") ? void (0) : __assert_fail ("(Receiver || SuperLoc.isValid()) && \"If the Receiver is null, the \" \"SuperLoc must be valid so we can \" \"use it instead.\""
, "/build/llvm-toolchain-snapshot-7~svn337490/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2630, __extension__ __PRETTY_FUNCTION__))
;
2631
2632 // The location of the receiver.
2633 SourceLocation Loc = SuperLoc.isValid()? SuperLoc : Receiver->getLocStart();
2634 SourceRange RecRange =
2635 SuperLoc.isValid()? SuperLoc : Receiver->getSourceRange();
2636 ArrayRef<SourceLocation> SelectorSlotLocs;
2637 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2638 SelectorSlotLocs = SelectorLocs;
2639 else
2640 SelectorSlotLocs = Loc;
2641 SourceLocation SelLoc = SelectorSlotLocs.front();
2642
2643 if (LBracLoc.isInvalid()) {
2644 Diag(Loc, diag::err_missing_open_square_message_send)
2645 << FixItHint::CreateInsertion(Loc, "[");
2646 LBracLoc = Loc;
2647 }
2648
2649 // If we have a receiver expression, perform appropriate promotions
2650 // and determine receiver type.
2651 if (Receiver) {
2652 if (Receiver->hasPlaceholderType()) {
2653 ExprResult Result;
2654 if (Receiver->getType() == Context.UnknownAnyTy)
2655 Result = forceUnknownAnyToType(Receiver, Context.getObjCIdType());
2656 else
2657 Result = CheckPlaceholderExpr(Receiver);
2658 if (Result.isInvalid()) return ExprError();
2659 Receiver = Result.get();
2660 }
2661
2662 if (Receiver->isTypeDependent()) {
2663 // If the receiver is type-dependent, we can't type-check anything
2664 // at this point. Build a dependent expression.
2665 unsigned NumArgs = ArgsIn.size();
2666 Expr **Args = ArgsIn.data();
2667 assert(SuperLoc.isInvalid() && "Message to super with dependent type")(static_cast <bool> (SuperLoc.isInvalid() && "Message to super with dependent type"
) ? void (0) : __assert_fail ("SuperLoc.isInvalid() && \"Message to super with dependent type\""
, "/build/llvm-toolchain-snapshot-7~svn337490/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2667, __extension__ __PRETTY_FUNCTION__))
;
2668 return ObjCMessageExpr::Create(
2669 Context, Context.DependentTy, VK_RValue, LBracLoc, Receiver, Sel,
2670 SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs),
2671 RBracLoc, isImplicit);
2672 }
2673
2674 // If necessary, apply function/array conversion to the receiver.
2675 // C99 6.7.5.3p[7,8].
2676 ExprResult Result = DefaultFunctionArrayLvalueConversion(Receiver);
2677 if (Result.isInvalid())
2678 return ExprError();
2679 Receiver = Result.get();
2680 ReceiverType = Receiver->getType();
2681
2682 // If the receiver is an ObjC pointer, a block pointer, or an
2683 // __attribute__((NSObject)) pointer, we don't need to do any
2684 // special conversion in order to look up a receiver.
2685 if (ReceiverType->isObjCRetainableType()) {
2686 // do nothing
2687 } else if (!getLangOpts().ObjCAutoRefCount &&
2688 !Context.getObjCIdType().isNull() &&
2689 (ReceiverType->isPointerType() ||
2690 ReceiverType->isIntegerType())) {
2691 // Implicitly convert integers and pointers to 'id' but emit a warning.
2692 // But not in ARC.
2693 Diag(Loc, diag::warn_bad_receiver_type)
2694 << ReceiverType
2695 << Receiver->getSourceRange();
2696 if (ReceiverType->isPointerType()) {
2697 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2698 CK_CPointerToObjCPointerCast).get();
2699 } else {
2700 // TODO: specialized warning on null receivers?
2701 bool IsNull = Receiver->isNullPointerConstant(Context,
2702 Expr::NPC_ValueDependentIsNull);
2703 CastKind Kind = IsNull ? CK_NullToPointer : CK_IntegralToPointer;
2704 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2705 Kind).get();
2706 }
2707 ReceiverType = Receiver->getType();
2708 } else if (getLangOpts().CPlusPlus) {
2709 // The receiver must be a complete type.
2710 if (RequireCompleteType(Loc, Receiver->getType(),
2711 diag::err_incomplete_receiver_type))
2712 return ExprError();
2713
2714 ExprResult result = PerformContextuallyConvertToObjCPointer(Receiver);
2715 if (result.isUsable()) {
2716 Receiver = result.get();
2717 ReceiverType = Receiver->getType();
2718 }
2719 }
2720 }
2721
2722 if (ReceiverType->isObjCIdType() && !isImplicit)
2723 Diag(Receiver->getExprLoc(), diag::warn_messaging_unqualified_id);
2724
2725 // There's a somewhat weird interaction here where we assume that we
2726 // won't actually have a method unless we also don't need to do some
2727 // of the more detailed type-checking on the receiver.
2728
2729 if (!Method) {
2730 // Handle messages to id and __kindof types (where we use the
2731 // global method pool).
2732 const ObjCObjectType *typeBound = nullptr;
2733 bool receiverIsIdLike = ReceiverType->isObjCIdOrObjectKindOfType(Context,
2734 typeBound);
2735 if (receiverIsIdLike || ReceiverType->isBlockPointerType() ||
2736 (Receiver && Context.isObjCNSObjectType(Receiver->getType()))) {
2737 SmallVector<ObjCMethodDecl*, 4> Methods;
2738 // If we have a type bound, further filter the methods.
2739 CollectMultipleMethodsInGlobalPool(Sel, Methods, true/*InstanceFirst*/,
2740 true/*CheckTheOther*/, typeBound);
2741 if (!Methods.empty()) {
2742 // We choose the first method as the initial candidate, then try to
2743 // select a better one.
2744 Method = Methods[0];
2745
2746 if (ObjCMethodDecl *BestMethod =
2747 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(), Methods))
2748 Method = BestMethod;
2749
2750 if (!AreMultipleMethodsInGlobalPool(Sel, Method,
2751 SourceRange(LBracLoc, RBracLoc),
2752 receiverIsIdLike, Methods))
2753 DiagnoseUseOfDecl(Method, SelectorSlotLocs);
2754 }
2755 } else if (ReceiverType->isObjCClassOrClassKindOfType() ||
2756 ReceiverType->isObjCQualifiedClassType()) {
2757 // Handle messages to Class.
2758 // We allow sending a message to a qualified Class ("Class<foo>"), which
2759 // is ok as long as one of the protocols implements the selector (if not,
2760 // warn).
2761 if (!ReceiverType->isObjCClassOrClassKindOfType()) {
2762 const ObjCObjectPointerType *QClassTy
2763 = ReceiverType->getAsObjCQualifiedClassType();
2764 // Search protocols for class methods.
2765 Method = LookupMethodInQualifiedType(Sel, QClassTy, false);
2766 if (!Method) {
2767 Method = LookupMethodInQualifiedType(Sel, QClassTy, true);
2768 // warn if instance method found for a Class message.
2769 if (Method && !isMethodDeclaredInRootProtocol(*this, Method)) {
2770 Diag(SelLoc, diag::warn_instance_method_on_class_found)
2771 << Method->getSelector() << Sel;
2772 Diag(Method->getLocation(), diag::note_method_declared_at)
2773 << Method->getDeclName();
2774 }
2775 }
2776 } else {
2777 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2778 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) {
2779 // First check the public methods in the class interface.
2780 Method = ClassDecl->lookupClassMethod(Sel);
2781
2782 if (!Method)
2783 Method = ClassDecl->lookupPrivateClassMethod(Sel);
2784 }
2785 if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs))
2786 return ExprError();
2787 }
2788 if (!Method) {
2789 // If not messaging 'self', look for any factory method named 'Sel'.
2790 if (!Receiver || !isSelfExpr(Receiver)) {
2791 // If no class (factory) method was found, check if an _instance_
2792 // method of the same name exists in the root class only.
2793 SmallVector<ObjCMethodDecl*, 4> Methods;
2794 CollectMultipleMethodsInGlobalPool(Sel, Methods,
2795 false/*InstanceFirst*/,
2796 true/*CheckTheOther*/);
2797 if (!Methods.empty()) {
2798 // We choose the first method as the initial candidate, then try
2799 // to select a better one.
2800 Method = Methods[0];
2801
2802 // If we find an instance method, emit warning.
2803 if (Method->isInstanceMethod()) {
2804 if (const ObjCInterfaceDecl *ID =
2805 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext())) {
2806 if (ID->getSuperClass())
2807 Diag(SelLoc, diag::warn_root_inst_method_not_found)
2808 << Sel << SourceRange(LBracLoc, RBracLoc);
2809 }
2810 }
2811
2812 if (ObjCMethodDecl *BestMethod =
2813 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(),
2814 Methods))
2815 Method = BestMethod;
2816 }
2817 }
2818 }
2819 }
2820 } else {
2821 ObjCInterfaceDecl *ClassDecl = nullptr;
2822
2823 // We allow sending a message to a qualified ID ("id<foo>"), which is ok as
2824 // long as one of the protocols implements the selector (if not, warn).
2825 // And as long as message is not deprecated/unavailable (warn if it is).
2826 if (const ObjCObjectPointerType *QIdTy
2827 = ReceiverType->getAsObjCQualifiedIdType()) {
2828 // Search protocols for instance methods.
2829 Method = LookupMethodInQualifiedType(Sel, QIdTy, true);
2830 if (!Method)
2831 Method = LookupMethodInQualifiedType(Sel, QIdTy, false);
2832 if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs))
2833 return ExprError();
2834 } else if (const ObjCObjectPointerType *OCIType
2835 = ReceiverType->getAsObjCInterfacePointerType()) {
2836 // We allow sending a message to a pointer to an interface (an object).
2837 ClassDecl = OCIType->getInterfaceDecl();
2838
2839 // Try to complete the type. Under ARC, this is a hard error from which
2840 // we don't try to recover.
2841 // FIXME: In the non-ARC case, this will still be a hard error if the
2842 // definition is found in a module that's not visible.
2843 const ObjCInterfaceDecl *forwardClass = nullptr;
2844 if (RequireCompleteType(Loc, OCIType->getPointeeType(),
2845 getLangOpts().ObjCAutoRefCount
2846 ? diag::err_arc_receiver_forward_instance
2847 : diag::warn_receiver_forward_instance,
2848 Receiver? Receiver->getSourceRange()
2849 : SourceRange(SuperLoc))) {
2850 if (getLangOpts().ObjCAutoRefCount)
2851 return ExprError();
2852
2853 forwardClass = OCIType->getInterfaceDecl();
2854 Diag(Receiver ? Receiver->getLocStart()
2855 : SuperLoc, diag::note_receiver_is_id);
2856 Method = nullptr;
2857 } else {
2858 Method = ClassDecl->lookupInstanceMethod(Sel);
2859 }
2860
2861 if (!Method)
2862 // Search protocol qualifiers.
2863 Method = LookupMethodInQualifiedType(Sel, OCIType, true);
2864
2865 if (!Method) {
2866 // If we have implementations in scope, check "private" methods.
2867 Method = ClassDecl->lookupPrivateMethod(Sel);
2868
2869 if (!Method && getLangOpts().ObjCAutoRefCount) {
2870 Diag(SelLoc, diag::err_arc_may_not_respond)
2871 << OCIType->getPointeeType() << Sel << RecRange
2872 << SourceRange(SelectorLocs.front(), SelectorLocs.back());
2873 return ExprError();
2874 }
2875
2876 if (!Method && (!Receiver || !isSelfExpr(Receiver))) {
2877 // If we still haven't found a method, look in the global pool. This
2878 // behavior isn't very desirable, however we need it for GCC
2879 // compatibility. FIXME: should we deviate??
2880 if (OCIType->qual_empty()) {
2881 SmallVector<ObjCMethodDecl*, 4> Methods;
2882 CollectMultipleMethodsInGlobalPool(Sel, Methods,
2883 true/*InstanceFirst*/,
2884 false/*CheckTheOther*/);
2885 if (!Methods.empty()) {
2886 // We choose the first method as the initial candidate, then try
2887 // to select a better one.
2888 Method = Methods[0];
2889
2890 if (ObjCMethodDecl *BestMethod =
2891 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(),
2892 Methods))
2893 Method = BestMethod;
2894
2895 AreMultipleMethodsInGlobalPool(Sel, Method,
2896 SourceRange(LBracLoc, RBracLoc),
2897 true/*receiverIdOrClass*/,
2898 Methods);
2899 }
2900 if (Method && !forwardClass)
2901 Diag(SelLoc, diag::warn_maynot_respond)
2902 << OCIType->getInterfaceDecl()->getIdentifier()
2903 << Sel << RecRange;
2904 }
2905 }
2906 }
2907 if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs, forwardClass))
2908 return ExprError();
2909 } else {
2910 // Reject other random receiver types (e.g. structs).
2911 Diag(Loc, diag::err_bad_receiver_type)
2912 << ReceiverType << Receiver->getSourceRange();
2913 return ExprError();
2914 }
2915 }
2916 }
2917
2918 FunctionScopeInfo *DIFunctionScopeInfo =
2919 (Method && Method->getMethodFamily() == OMF_init)
2920 ? getEnclosingFunction() : nullptr;
2921
2922 if (DIFunctionScopeInfo &&
2923 DIFunctionScopeInfo->ObjCIsDesignatedInit &&
2924 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2925 bool isDesignatedInitChain = false;
2926 if (SuperLoc.isValid()) {
2927 if (const ObjCObjectPointerType *
2928 OCIType = ReceiverType->getAsObjCInterfacePointerType()) {
2929 if (const ObjCInterfaceDecl *ID = OCIType->getInterfaceDecl()) {
2930 // Either we know this is a designated initializer or we
2931 // conservatively assume it because we don't know for sure.
2932 if (!ID->declaresOrInheritsDesignatedInitializers() ||
2933 ID->isDesignatedInitializer(Sel)) {
2934 isDesignatedInitChain = true;
2935 DIFunctionScopeInfo->ObjCWarnForNoDesignatedInitChain = false;
2936 }
2937 }
2938 }
2939 }
2940 if (!isDesignatedInitChain) {
2941 const ObjCMethodDecl *InitMethod = nullptr;
2942 bool isDesignated =
2943 getCurMethodDecl()->isDesignatedInitializerForTheInterface(&InitMethod);
2944 assert(isDesignated && InitMethod)(static_cast <bool> (isDesignated && InitMethod
) ? void (0) : __assert_fail ("isDesignated && InitMethod"
, "/build/llvm-toolchain-snapshot-7~svn337490/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 2944, __extension__ __PRETTY_FUNCTION__))
;
2945 (void)isDesignated;
2946 Diag(SelLoc, SuperLoc.isValid() ?
2947 diag::warn_objc_designated_init_non_designated_init_call :
2948 diag::warn_objc_designated_init_non_super_designated_init_call);
2949 Diag(InitMethod->getLocation(),
2950 diag::note_objc_designated_init_marked_here);
2951 }
2952 }
2953
2954 if (DIFunctionScopeInfo &&
2955 DIFunctionScopeInfo->ObjCIsSecondaryInit &&
2956 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2957 if (SuperLoc.isValid()) {
2958 Diag(SelLoc, diag::warn_objc_secondary_init_super_init_call);
2959 } else {
2960 DIFunctionScopeInfo->ObjCWarnForNoInitDelegation = false;
2961 }
2962 }
2963
2964 // Check the message arguments.
2965 unsigned NumArgs = ArgsIn.size();
2966 Expr **Args = ArgsIn.data();
2967 QualType ReturnType;
2968 ExprValueKind VK = VK_RValue;
2969 bool ClassMessage = (ReceiverType->isObjCClassType() ||
2970 ReceiverType->isObjCQualifiedClassType());
2971 if (CheckMessageArgumentTypes(ReceiverType, MultiExprArg(Args, NumArgs),
2972 Sel, SelectorLocs, Method,
2973 ClassMessage, SuperLoc.isValid(),
2974 LBracLoc, RBracLoc, RecRange, ReturnType, VK))
2975 return ExprError();
2976
2977 if (Method && !Method->getReturnType()->isVoidType() &&
2978 RequireCompleteType(LBracLoc, Method->getReturnType(),
2979 diag::err_illegal_message_expr_incomplete_type))
2980 return ExprError();
2981
2982 // In ARC, forbid the user from sending messages to
2983 // retain/release/autorelease/dealloc/retainCount explicitly.
2984 if (getLangOpts().ObjCAutoRefCount) {
2985 ObjCMethodFamily family =
2986 (Method ? Method->getMethodFamily() : Sel.getMethodFamily());
2987 switch (family) {
2988 case OMF_init:
2989 if (Method)
2990 checkInitMethod(Method, ReceiverType);
2991 break;
2992
2993 case OMF_None:
2994 case OMF_alloc:
2995 case OMF_copy:
2996 case OMF_finalize:
2997 case OMF_mutableCopy:
2998 case OMF_new:
2999 case OMF_self:
3000 case OMF_initialize:
3001 break;
3002
3003 case OMF_dealloc:
3004 case OMF_retain:
3005 case OMF_release:
3006 case OMF_autorelease:
3007 case OMF_retainCount:
3008 Diag(SelLoc, diag::err_arc_illegal_explicit_message)
3009 << Sel << RecRange;
3010 break;
3011
3012 case OMF_performSelector:
3013 if (Method && NumArgs >= 1) {
3014 if (const auto *SelExp =
3015 dyn_cast<ObjCSelectorExpr>(Args[0]->IgnoreParens())) {
3016 Selector ArgSel = SelExp->getSelector();
3017 ObjCMethodDecl *SelMethod =
3018 LookupInstanceMethodInGlobalPool(ArgSel,
3019 SelExp->getSourceRange());
3020 if (!SelMethod)
3021 SelMethod =
3022 LookupFactoryMethodInGlobalPool(ArgSel,
3023 SelExp->getSourceRange());
3024 if (SelMethod) {
3025 ObjCMethodFamily SelFamily = SelMethod->getMethodFamily();
3026 switch (SelFamily) {
3027 case OMF_alloc:
3028 case OMF_copy:
3029 case OMF_mutableCopy:
3030 case OMF_new:
3031 case OMF_init:
3032 // Issue error, unless ns_returns_not_retained.
3033 if (!SelMethod->hasAttr<NSReturnsNotRetainedAttr>()) {
3034 // selector names a +1 method
3035 Diag(SelLoc,
3036 diag::err_arc_perform_selector_retains);
3037 Diag(SelMethod->getLocation(), diag::note_method_declared_at)
3038 << SelMethod->getDeclName();
3039 }
3040 break;
3041 default:
3042 // +0 call. OK. unless ns_returns_retained.
3043 if (SelMethod->hasAttr<NSReturnsRetainedAttr>()) {
3044 // selector names a +1 method
3045 Diag(SelLoc,
3046 diag::err_arc_perform_selector_retains);
3047 Diag(SelMethod->getLocation(), diag::note_method_declared_at)
3048 << SelMethod->getDeclName();
3049 }
3050 break;
3051 }
3052 }
3053 } else {
3054 // error (may leak).
3055 Diag(SelLoc, diag::warn_arc_perform_selector_leaks);
3056 Diag(Args[0]->getExprLoc(), diag::note_used_here);
3057 }
3058 }
3059 break;
3060 }
3061 }
3062
3063 DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
3064
3065 // Construct the appropriate ObjCMessageExpr instance.
3066 ObjCMessageExpr *Result;
3067 if (SuperLoc.isValid())
3068 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
3069 SuperLoc, /*IsInstanceSuper=*/true,
3070 ReceiverType, Sel, SelectorLocs, Method,
3071 makeArrayRef(Args, NumArgs), RBracLoc,
3072 isImplicit);
3073 else {
3074 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
3075 Receiver, Sel, SelectorLocs, Method,
3076 makeArrayRef(Args, NumArgs), RBracLoc,
3077 isImplicit);
3078 if (!isImplicit)
3079 checkCocoaAPI(*this, Result);
3080 }
3081 if (Method) {
3082 bool IsClassObjectCall = ClassMessage;
3083 // 'self' message receivers in class methods should be treated as message
3084 // sends to the class object in order for the semantic checks to be
3085 // performed correctly. Messages to 'super' already count as class messages,
3086 // so they don't need to be handled here.
3087 if (Receiver && isSelfExpr(Receiver)) {
3088 if (const auto *OPT = ReceiverType->getAs<ObjCObjectPointerType>()) {
3089 if (OPT->getObjectType()->isObjCClass()) {
3090 if (const auto *CurMeth = getCurMethodDecl()) {
3091 IsClassObjectCall = true;
3092 ReceiverType =
3093 Context.getObjCInterfaceType(CurMeth->getClassInterface());
3094 }
3095 }
3096 }
3097 }
3098 checkFoundationAPI(*this, SelLoc, Method, makeArrayRef(Args, NumArgs),
3099 ReceiverType, IsClassObjectCall);
3100 }
3101
3102 if (getLangOpts().ObjCAutoRefCount) {
3103 // In ARC, annotate delegate init calls.
3104 if (Result->getMethodFamily() == OMF_init &&
3105 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
3106 // Only consider init calls *directly* in init implementations,
3107 // not within blocks.
3108 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(CurContext);
3109 if (method && method->getMethodFamily() == OMF_init) {
3110 // The implicit assignment to self means we also don't want to
3111 // consume the result.
3112 Result->setDelegateInitCall(true);
3113 return Result;
3114 }
3115 }
3116
3117 // In ARC, check for message sends which are likely to introduce
3118 // retain cycles.
3119 checkRetainCycles(Result);
3120 }
3121
3122 if (getLangOpts().ObjCWeak) {
3123 if (!isImplicit && Method) {
3124 if (const ObjCPropertyDecl *Prop = Method->findPropertyDecl()) {
3125 bool IsWeak =
3126 Prop->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak;
3127 if (!IsWeak && Sel.isUnarySelector())
3128 IsWeak = ReturnType.getObjCLifetime() & Qualifiers::OCL_Weak;
3129 if (IsWeak &&
3130 !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, LBracLoc))
3131 getCurFunction()->recordUseOfWeak(Result, Prop);
3132 }
3133 }
3134 }
3135
3136 CheckObjCCircularContainer(Result);
3137
3138 return MaybeBindToTemporary(Result);
3139}
3140
3141static void RemoveSelectorFromWarningCache(Sema &S, Expr* Arg) {
3142 if (ObjCSelectorExpr *OSE =
3143 dyn_cast<ObjCSelectorExpr>(Arg->IgnoreParenCasts())) {
3144 Selector Sel = OSE->getSelector();
3145 SourceLocation Loc = OSE->getAtLoc();
3146 auto Pos = S.ReferencedSelectors.find(Sel);
3147 if (Pos != S.ReferencedSelectors.end() && Pos->second == Loc)
3148 S.ReferencedSelectors.erase(Pos);
3149 }
3150}
3151
3152// ActOnInstanceMessage - used for both unary and keyword messages.
3153// ArgExprs is optional - if it is present, the number of expressions
3154// is obtained from Sel.getNumArgs().
3155ExprResult Sema::ActOnInstanceMessage(Scope *S,
3156 Expr *Receiver,
3157 Selector Sel,
3158 SourceLocation LBracLoc,
3159 ArrayRef<SourceLocation> SelectorLocs,
3160 SourceLocation RBracLoc,
3161 MultiExprArg Args) {
3162 if (!Receiver)
3163 return ExprError();
3164
3165 // A ParenListExpr can show up while doing error recovery with invalid code.
3166 if (isa<ParenListExpr>(Receiver)) {
3167 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Receiver);
3168 if (Result.isInvalid()) return ExprError();
3169 Receiver = Result.get();
3170 }
3171
3172 if (RespondsToSelectorSel.isNull()) {
3173 IdentifierInfo *SelectorId = &Context.Idents.get("respondsToSelector");
3174 RespondsToSelectorSel = Context.Selectors.getUnarySelector(SelectorId);
3175 }
3176 if (Sel == RespondsToSelectorSel)
3177 RemoveSelectorFromWarningCache(*this, Args[0]);
3178
3179 return BuildInstanceMessage(Receiver, Receiver->getType(),
3180 /*SuperLoc=*/SourceLocation(), Sel,
3181 /*Method=*/nullptr, LBracLoc, SelectorLocs,
3182 RBracLoc, Args);
3183}
3184
3185enum ARCConversionTypeClass {
3186 /// int, void, struct A
3187 ACTC_none,
3188
3189 /// id, void (^)()
3190 ACTC_retainable,
3191
3192 /// id*, id***, void (^*)(),
3193 ACTC_indirectRetainable,
3194
3195 /// void* might be a normal C type, or it might a CF type.
3196 ACTC_voidPtr,
3197
3198 /// struct A*
3199 ACTC_coreFoundation
3200};
3201
3202static bool isAnyRetainable(ARCConversionTypeClass ACTC) {
3203 return (ACTC == ACTC_retainable ||
3204 ACTC == ACTC_coreFoundation ||
3205 ACTC == ACTC_voidPtr);
3206}
3207
3208static bool isAnyCLike(ARCConversionTypeClass ACTC) {
3209 return ACTC == ACTC_none ||
3210 ACTC == ACTC_voidPtr ||
3211 ACTC == ACTC_coreFoundation;
3212}
3213
3214static ARCConversionTypeClass classifyTypeForARCConversion(QualType type) {
3215 bool isIndirect = false;
3216
3217 // Ignore an outermost reference type.
3218 if (const ReferenceType *ref = type->getAs<ReferenceType>()) {
3219 type = ref->getPointeeType();
3220 isIndirect = true;
3221 }
3222
3223 // Drill through pointers and arrays recursively.
3224 while (true) {
3225 if (const PointerType *ptr = type->getAs<PointerType>()) {
3226 type = ptr->getPointeeType();
3227
3228 // The first level of pointer may be the innermost pointer on a CF type.
3229 if (!isIndirect) {
3230 if (type->isVoidType()) return ACTC_voidPtr;
3231 if (type->isRecordType()) return ACTC_coreFoundation;
3232 }
3233 } else if (const ArrayType *array = type->getAsArrayTypeUnsafe()) {
3234 type = QualType(array->getElementType()->getBaseElementTypeUnsafe(), 0);
3235 } else {
3236 break;
3237 }
3238 isIndirect = true;
3239 }
3240
3241 if (isIndirect) {
3242 if (type->isObjCARCBridgableType())
3243 return ACTC_indirectRetainable;
3244 return ACTC_none;
3245 }
3246
3247 if (type->isObjCARCBridgableType())
3248 return ACTC_retainable;
3249
3250 return ACTC_none;
3251}
3252
3253namespace {
3254 /// A result from the cast checker.
3255 enum ACCResult {
3256 /// Cannot be casted.
3257 ACC_invalid,
3258
3259 /// Can be safely retained or not retained.
3260 ACC_bottom,
3261
3262 /// Can be casted at +0.
3263 ACC_plusZero,
3264
3265 /// Can be casted at +1.
3266 ACC_plusOne
3267 };
3268 ACCResult merge(ACCResult left, ACCResult right) {
3269 if (left == right) return left;
3270 if (left == ACC_bottom) return right;
3271 if (right == ACC_bottom) return left;
3272 return ACC_invalid;
3273 }
3274
3275 /// A checker which white-lists certain expressions whose conversion
3276 /// to or from retainable type would otherwise be forbidden in ARC.
3277 class ARCCastChecker : public StmtVisitor<ARCCastChecker, ACCResult> {
3278 typedef StmtVisitor<ARCCastChecker, ACCResult> super;
3279
3280 ASTContext &Context;
3281 ARCConversionTypeClass SourceClass;
3282 ARCConversionTypeClass TargetClass;
3283 bool Diagnose;
3284
3285 static bool isCFType(QualType type) {
3286 // Someday this can use ns_bridged. For now, it has to do this.
3287 return type->isCARCBridgableType();
3288 }
3289
3290 public:
3291 ARCCastChecker(ASTContext &Context, ARCConversionTypeClass source,
3292 ARCConversionTypeClass target, bool diagnose)
3293 : Context(Context), SourceClass(source), TargetClass(target),
3294 Diagnose(diagnose) {}
3295
3296 using super::Visit;
3297 ACCResult Visit(Expr *e) {
3298 return super::Visit(e->IgnoreParens());
3299 }
3300
3301 ACCResult VisitStmt(Stmt *s) {
3302 return ACC_invalid;
3303 }
3304
3305 /// Null pointer constants can be casted however you please.
3306 ACCResult VisitExpr(Expr *e) {
3307 if (e->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull))
3308 return ACC_bottom;
3309 return ACC_invalid;
3310 }
3311
3312 /// Objective-C string literals can be safely casted.
3313 ACCResult VisitObjCStringLiteral(ObjCStringLiteral *e) {
3314 // If we're casting to any retainable type, go ahead. Global
3315 // strings are immune to retains, so this is bottom.
3316 if (isAnyRetainable(TargetClass)) return ACC_bottom;
3317
3318 return ACC_invalid;
3319 }
3320
3321 /// Look through certain implicit and explicit casts.
3322 ACCResult VisitCastExpr(CastExpr *e) {
3323 switch (e->getCastKind()) {
3324 case CK_NullToPointer:
3325 return ACC_bottom;
3326
3327 case CK_NoOp:
3328 case CK_LValueToRValue:
3329 case CK_BitCast:
3330 case CK_CPointerToObjCPointerCast:
3331 case CK_BlockPointerToObjCPointerCast:
3332 case CK_AnyPointerToBlockPointerCast:
3333 return Visit(e->getSubExpr());
3334
3335 default:
3336 return ACC_invalid;
3337 }
3338 }
3339
3340 /// Look through unary extension.
3341 ACCResult VisitUnaryExtension(UnaryOperator *e) {
3342 return Visit(e->getSubExpr());
3343 }
3344
3345 /// Ignore the LHS of a comma operator.
3346 ACCResult VisitBinComma(BinaryOperator *e) {
3347 return Visit(e->getRHS());
3348 }
3349
3350 /// Conditional operators are okay if both sides are okay.
3351 ACCResult VisitConditionalOperator(ConditionalOperator *e) {
3352 ACCResult left = Visit(e->getTrueExpr());
3353 if (left == ACC_invalid) return ACC_invalid;
3354 return merge(left, Visit(e->getFalseExpr()));
3355 }
3356
3357 /// Look through pseudo-objects.
3358 ACCResult VisitPseudoObjectExpr(PseudoObjectExpr *e) {
3359 // If we're getting here, we should always have a result.
3360 return Visit(e->getResultExpr());
3361 }
3362
3363 /// Statement expressions are okay if their result expression is okay.
3364 ACCResult VisitStmtExpr(StmtExpr *e) {
3365 return Visit(e->getSubStmt()->body_back());
3366 }
3367
3368 /// Some declaration references are okay.
3369 ACCResult VisitDeclRefExpr(DeclRefExpr *e) {
3370 VarDecl *var = dyn_cast<VarDecl>(e->getDecl());
3371 // References to global constants are okay.
3372 if (isAnyRetainable(TargetClass) &&
3373 isAnyRetainable(SourceClass) &&
3374 var &&
3375 !var->hasDefinition(Context) &&
3376 var->getType().isConstQualified()) {
3377
3378 // In system headers, they can also be assumed to be immune to retains.
3379 // These are things like 'kCFStringTransformToLatin'.
3380 if (Context.getSourceManager().isInSystemHeader(var->getLocation()))
3381 return ACC_bottom;
3382
3383 return ACC_plusZero;
3384 }
3385
3386 // Nothing else.
3387 return ACC_invalid;
3388 }
3389
3390 /// Some calls are okay.
3391 ACCResult VisitCallExpr(CallExpr *e) {
3392 if (FunctionDecl *fn = e->getDirectCallee())
3393 if (ACCResult result = checkCallToFunction(fn))
3394 return result;
3395
3396 return super::VisitCallExpr(e);
3397 }
3398
3399 ACCResult checkCallToFunction(FunctionDecl *fn) {
3400 // Require a CF*Ref return type.
3401 if (!isCFType(fn->getReturnType()))
3402 return ACC_invalid;
3403
3404 if (!isAnyRetainable(TargetClass))
3405 return ACC_invalid;
3406
3407 // Honor an explicit 'not retained' attribute.
3408 if (fn->hasAttr<CFReturnsNotRetainedAttr>())
3409 return ACC_plusZero;
3410
3411 // Honor an explicit 'retained' attribute, except that for
3412 // now we're not going to permit implicit handling of +1 results,
3413 // because it's a bit frightening.
3414 if (fn->hasAttr<CFReturnsRetainedAttr>())
3415 return Diagnose ? ACC_plusOne
3416 : ACC_invalid; // ACC_plusOne if we start accepting this
3417
3418 // Recognize this specific builtin function, which is used by CFSTR.
3419 unsigned builtinID = fn->getBuiltinID();
3420 if (builtinID == Builtin::BI__builtin___CFStringMakeConstantString)
3421 return ACC_bottom;
3422
3423 // Otherwise, don't do anything implicit with an unaudited function.
3424 if (!fn->hasAttr<CFAuditedTransferAttr>())
3425 return ACC_invalid;
3426
3427 // Otherwise, it's +0 unless it follows the create convention.
3428 if (ento::coreFoundation::followsCreateRule(fn))
3429 return Diagnose ? ACC_plusOne
3430 : ACC_invalid; // ACC_plusOne if we start accepting this
3431
3432 return ACC_plusZero;
3433 }
3434
3435 ACCResult VisitObjCMessageExpr(ObjCMessageExpr *e) {
3436 return checkCallToMethod(e->getMethodDecl());
3437 }
3438
3439 ACCResult VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *e) {
3440 ObjCMethodDecl *method;
3441 if (e->isExplicitProperty())
3442 method = e->getExplicitProperty()->getGetterMethodDecl();
3443 else
3444 method = e->getImplicitPropertyGetter();
3445 return checkCallToMethod(method);
3446 }
3447
3448 ACCResult checkCallToMethod(ObjCMethodDecl *method) {
3449 if (!method) return ACC_invalid;
3450
3451 // Check for message sends to functions returning CF types. We
3452 // just obey the Cocoa conventions with these, even though the
3453 // return type is CF.
3454 if (!isAnyRetainable(TargetClass) || !isCFType(method->getReturnType()))
3455 return ACC_invalid;
3456
3457 // If the method is explicitly marked not-retained, it's +0.
3458 if (method->hasAttr<CFReturnsNotRetainedAttr>())
3459 return ACC_plusZero;
3460
3461 // If the method is explicitly marked as returning retained, or its
3462 // selector follows a +1 Cocoa convention, treat it as +1.
3463 if (method->hasAttr<CFReturnsRetainedAttr>())
3464 return ACC_plusOne;
3465
3466 switch (method->getSelector().getMethodFamily()) {
3467 case OMF_alloc:
3468 case OMF_copy:
3469 case OMF_mutableCopy:
3470 case OMF_new:
3471 return ACC_plusOne;
3472
3473 default:
3474 // Otherwise, treat it as +0.
3475 return ACC_plusZero;
3476 }
3477 }
3478 };
3479} // end anonymous namespace
3480
3481bool Sema::isKnownName(StringRef name) {
3482 if (name.empty())
3483 return false;
3484 LookupResult R(*this, &Context.Idents.get(name), SourceLocation(),
3485 Sema::LookupOrdinaryName);
3486 return LookupName(R, TUScope, false);
3487}
3488
3489static void addFixitForObjCARCConversion(Sema &S,
3490 DiagnosticBuilder &DiagB,
3491 Sema::CheckedConversionKind CCK,
3492 SourceLocation afterLParen,
3493 QualType castType,
3494 Expr *castExpr,
3495 Expr *realCast,
3496 const char *bridgeKeyword,
3497 const char *CFBridgeName) {
3498 // We handle C-style and implicit casts here.
3499 switch (CCK) {
3500 case Sema::CCK_ImplicitConversion:
3501 case Sema::CCK_ForBuiltinOverloadedOp:
3502 case Sema::CCK_CStyleCast:
3503 case Sema::CCK_OtherCast:
3504 break;
3505 case Sema::CCK_FunctionalCast:
3506 return;
3507 }
3508
3509 if (CFBridgeName) {
3510 if (CCK == Sema::CCK_OtherCast) {
3511 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3512 SourceRange range(NCE->getOperatorLoc(),
3513 NCE->getAngleBrackets().getEnd());
3514 SmallString<32> BridgeCall;
3515
3516 SourceManager &SM = S.getSourceManager();
3517 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3518 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3519 BridgeCall += ' ';
3520
3521 BridgeCall += CFBridgeName;
3522 DiagB.AddFixItHint(FixItHint::CreateReplacement(range, BridgeCall));
3523 }
3524 return;
3525 }
3526 Expr *castedE = castExpr;
3527 if (CStyleCastExpr *CCE = dyn_cast<CStyleCastExpr>(castedE))
3528 castedE = CCE->getSubExpr();
3529 castedE = castedE->IgnoreImpCasts();
3530 SourceRange range = castedE->getSourceRange();
3531
3532 SmallString<32> BridgeCall;
3533
3534 SourceManager &SM = S.getSourceManager();
3535 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3536 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3537 BridgeCall += ' ';
3538
3539 BridgeCall += CFBridgeName;
3540
3541 if (isa<ParenExpr>(castedE)) {
3542 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3543 BridgeCall));
3544 } else {
3545 BridgeCall += '(';
3546 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3547 BridgeCall));
3548 DiagB.AddFixItHint(FixItHint::CreateInsertion(
3549 S.getLocForEndOfToken(range.getEnd()),
3550 ")"));
3551 }
3552 return;
3553 }
3554
3555 if (CCK == Sema::CCK_CStyleCast) {
3556 DiagB.AddFixItHint(FixItHint::CreateInsertion(afterLParen, bridgeKeyword));
3557 } else if (CCK == Sema::CCK_OtherCast) {
3558 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3559 std::string castCode = "(";
3560 castCode += bridgeKeyword;
3561 castCode += castType.getAsString();
3562 castCode += ")";
3563 SourceRange Range(NCE->getOperatorLoc(),
3564 NCE->getAngleBrackets().getEnd());
3565 DiagB.AddFixItHint(FixItHint::CreateReplacement(Range, castCode));
3566 }
3567 } else {
3568 std::string castCode = "(";
3569 castCode += bridgeKeyword;
3570 castCode += castType.getAsString();
3571 castCode += ")";
3572 Expr *castedE = castExpr->IgnoreImpCasts();
3573 SourceRange range = castedE->getSourceRange();
3574 if (isa<ParenExpr>(castedE)) {
3575 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3576 castCode));
3577 } else {
3578 castCode += "(";
3579 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3580 castCode));
3581 DiagB.AddFixItHint(FixItHint::CreateInsertion(
3582 S.getLocForEndOfToken(range.getEnd()),
3583 ")"));
3584 }
3585 }
3586}
3587
3588template <typename T>
3589static inline T *getObjCBridgeAttr(const TypedefType *TD) {
3590 TypedefNameDecl *TDNDecl = TD->getDecl();
3591 QualType QT = TDNDecl->getUnderlyingType();
3592 if (QT->isPointerType()) {
3593 QT = QT->getPointeeType();
3594 if (const RecordType *RT = QT->getAs<RecordType>())
3595 if (RecordDecl *RD = RT->getDecl()->getMostRecentDecl())
3596 return RD->getAttr<T>();
3597 }
3598 return nullptr;
3599}
3600
3601static ObjCBridgeRelatedAttr *ObjCBridgeRelatedAttrFromType(QualType T,
3602 TypedefNameDecl *&TDNDecl) {
3603 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3604 TDNDecl = TD->getDecl();
3605 if (ObjCBridgeRelatedAttr *ObjCBAttr =
3606 getObjCBridgeAttr<ObjCBridgeRelatedAttr>(TD))
3607 return ObjCBAttr;
3608 T = TDNDecl->getUnderlyingType();
3609 }
3610 return nullptr;
3611}
3612
3613static void
3614diagnoseObjCARCConversion(Sema &S, SourceRange castRange,
3615 QualType castType, ARCConversionTypeClass castACTC,
3616 Expr *castExpr, Expr *realCast,
3617 ARCConversionTypeClass exprACTC,
3618 Sema::CheckedConversionKind CCK) {
3619 SourceLocation loc =
3620 (castRange.isValid() ? castRange.getBegin() : castExpr->getExprLoc());
3621
3622 if (S.makeUnavailableInSystemHeader(loc,
3623 UnavailableAttr::IR_ARCForbiddenConversion))
3624 return;
3625
3626 QualType castExprType = castExpr->getType();
3627 // Defer emitting a diagnostic for bridge-related casts; that will be
3628 // handled by CheckObjCBridgeRelatedConversions.
3629 TypedefNameDecl *TDNDecl = nullptr;
3630 if ((castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable &&
3631 ObjCBridgeRelatedAttrFromType(castType, TDNDecl)) ||
3632 (exprACTC == ACTC_coreFoundation && castACTC == ACTC_retainable &&
3633 ObjCBridgeRelatedAttrFromType(castExprType, TDNDecl)))
3634 return;
3635
3636 unsigned srcKind = 0;
3637 switch (exprACTC) {
3638 case ACTC_none:
3639 case ACTC_coreFoundation:
3640 case ACTC_voidPtr:
3641 srcKind = (castExprType->isPointerType() ? 1 : 0);
3642 break;
3643 case ACTC_retainable:
3644 srcKind = (castExprType->isBlockPointerType() ? 2 : 3);
3645 break;
3646 case ACTC_indirectRetainable:
3647 srcKind = 4;
3648 break;
3649 }
3650
3651 // Check whether this could be fixed with a bridge cast.
3652 SourceLocation afterLParen = S.getLocForEndOfToken(castRange.getBegin());
3653 SourceLocation noteLoc = afterLParen.isValid() ? afterLParen : loc;
3654
3655 unsigned convKindForDiag = Sema::isCast(CCK) ? 0 : 1;
3656
3657 // Bridge from an ARC type to a CF type.
3658 if (castACTC == ACTC_retainable && isAnyRetainable(exprACTC)) {
3659
3660 S.Diag(loc, diag::err_arc_cast_requires_bridge)
3661 << convKindForDiag
3662 << 2 // of C pointer type
3663 << castExprType
3664 << unsigned(castType->isBlockPointerType()) // to ObjC|block type
3665 << castType
3666 << castRange
3667 << castExpr->getSourceRange();
3668 bool br = S.isKnownName("CFBridgingRelease");
3669 ACCResult CreateRule =
3670 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3671 assert(CreateRule != ACC_bottom && "This cast should already be accepted.")(static_cast <bool> (CreateRule != ACC_bottom &&
"This cast should already be accepted.") ? void (0) : __assert_fail
("CreateRule != ACC_bottom && \"This cast should already be accepted.\""
, "/build/llvm-toolchain-snapshot-7~svn337490/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 3671, __extension__ __PRETTY_FUNCTION__))
;
3672 if (CreateRule != ACC_plusOne)
3673 {
3674 DiagnosticBuilder DiagB =
3675 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3676 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3677
3678 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3679 castType, castExpr, realCast, "__bridge ",
3680 nullptr);
3681 }
3682 if (CreateRule != ACC_plusZero)
3683 {
3684 DiagnosticBuilder DiagB =
3685 (CCK == Sema::CCK_OtherCast && !br) ?
3686 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_transfer) << castExprType :
3687 S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3688 diag::note_arc_bridge_transfer)
3689 << castExprType << br;
3690
3691 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3692 castType, castExpr, realCast, "__bridge_transfer ",
3693 br ? "CFBridgingRelease" : nullptr);
3694 }
3695
3696 return;
3697 }
3698
3699 // Bridge from a CF type to an ARC type.
3700 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC)) {
3701 bool br = S.isKnownName("CFBridgingRetain");
3702 S.Diag(loc, diag::err_arc_cast_requires_bridge)
3703 << convKindForDiag
3704 << unsigned(castExprType->isBlockPointerType()) // of ObjC|block type
3705 << castExprType
3706 << 2 // to C pointer type
3707 << castType
3708 << castRange
3709 << castExpr->getSourceRange();
3710 ACCResult CreateRule =
3711 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3712 assert(CreateRule != ACC_bottom && "This cast should already be accepted.")(static_cast <bool> (CreateRule != ACC_bottom &&
"This cast should already be accepted.") ? void (0) : __assert_fail
("CreateRule != ACC_bottom && \"This cast should already be accepted.\""
, "/build/llvm-toolchain-snapshot-7~svn337490/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 3712, __extension__ __PRETTY_FUNCTION__))
;
3713 if (CreateRule != ACC_plusOne)
3714 {
3715 DiagnosticBuilder DiagB =
3716 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3717 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3718 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3719 castType, castExpr, realCast, "__bridge ",
3720 nullptr);
3721 }
3722 if (CreateRule != ACC_plusZero)
3723 {
3724 DiagnosticBuilder DiagB =
3725 (CCK == Sema::CCK_OtherCast && !br) ?
3726 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_retained) << castType :
3727 S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3728 diag::note_arc_bridge_retained)
3729 << castType << br;
3730
3731 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3732 castType, castExpr, realCast, "__bridge_retained ",
3733 br ? "CFBridgingRetain" : nullptr);
3734 }
3735
3736 return;
3737 }
3738
3739 S.Diag(loc, diag::err_arc_mismatched_cast)
3740 << !convKindForDiag
3741 << srcKind << castExprType << castType
3742 << castRange << castExpr->getSourceRange();
3743}
3744
3745template <typename TB>
3746static bool CheckObjCBridgeNSCast(Sema &S, QualType castType, Expr *castExpr,
3747 bool &HadTheAttribute, bool warn) {
3748 QualType T = castExpr->getType();
3749 HadTheAttribute = false;
3750 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3751 TypedefNameDecl *TDNDecl = TD->getDecl();
3752 if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3753 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3754 HadTheAttribute = true;
3755 if (Parm->isStr("id"))
3756 return true;
3757
3758 NamedDecl *Target = nullptr;
3759 // Check for an existing type with this name.
3760 LookupResult R(S, DeclarationName(Parm), SourceLocation(),
3761 Sema::LookupOrdinaryName);
3762 if (S.LookupName(R, S.TUScope)) {
3763 Target = R.getFoundDecl();
3764 if (Target && isa<ObjCInterfaceDecl>(Target)) {
3765 ObjCInterfaceDecl *ExprClass = cast<ObjCInterfaceDecl>(Target);
3766 if (const ObjCObjectPointerType *InterfacePointerType =
3767 castType->getAsObjCInterfacePointerType()) {
3768 ObjCInterfaceDecl *CastClass
3769 = InterfacePointerType->getObjectType()->getInterface();
3770 if ((CastClass == ExprClass) ||
3771 (CastClass && CastClass->isSuperClassOf(ExprClass)))
3772 return true;
3773 if (warn)
3774 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge)
3775 << T << Target->getName() << castType->getPointeeType();
3776 return false;
3777 } else if (castType->isObjCIdType() ||
3778 (S.Context.ObjCObjectAdoptsQTypeProtocols(
3779 castType, ExprClass)))
3780 // ok to cast to 'id'.
3781 // casting to id<p-list> is ok if bridge type adopts all of
3782 // p-list protocols.
3783 return true;
3784 else {
3785 if (warn) {
3786 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge)
3787 << T << Target->getName() << castType;
3788 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3789 S.Diag(Target->getLocStart(), diag::note_declared_at);
3790 }
3791 return false;
3792 }
3793 }
3794 } else if (!castType->isObjCIdType()) {
3795 S.Diag(castExpr->getLocStart(), diag::err_objc_cf_bridged_not_interface)
3796 << castExpr->getType() << Parm;
3797 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3798 if (Target)
3799 S.Diag(Target->getLocStart(), diag::note_declared_at);
3800 }
3801 return true;
3802 }
3803 return false;
3804 }
3805 T = TDNDecl->getUnderlyingType();
3806 }
3807 return true;
3808}
3809
3810template <typename TB>
3811static bool CheckObjCBridgeCFCast(Sema &S, QualType castType, Expr *castExpr,
3812 bool &HadTheAttribute, bool warn) {
3813 QualType T = castType;
3814 HadTheAttribute = false;
3815 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3816 TypedefNameDecl *TDNDecl = TD->getDecl();
3817 if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3818 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3819 HadTheAttribute = true;
3820 if (Parm->isStr("id"))
3821 return true;
3822
3823 NamedDecl *Target = nullptr;
3824 // Check for an existing type with this name.
3825 LookupResult R(S, DeclarationName(Parm), SourceLocation(),
3826 Sema::LookupOrdinaryName);
3827 if (S.LookupName(R, S.TUScope)) {
3828 Target = R.getFoundDecl();
3829 if (Target && isa<ObjCInterfaceDecl>(Target)) {
3830 ObjCInterfaceDecl *CastClass = cast<ObjCInterfaceDecl>(Target);
3831 if (const ObjCObjectPointerType *InterfacePointerType =
3832 castExpr->getType()->getAsObjCInterfacePointerType()) {
3833 ObjCInterfaceDecl *ExprClass
3834 = InterfacePointerType->getObjectType()->getInterface();
3835 if ((CastClass == ExprClass) ||
3836 (ExprClass && CastClass->isSuperClassOf(ExprClass)))
3837 return true;
3838 if (warn) {
3839 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge_to_cf)
3840 << castExpr->getType()->getPointeeType() << T;
3841 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3842 }
3843 return false;
3844 } else if (castExpr->getType()->isObjCIdType() ||
3845 (S.Context.QIdProtocolsAdoptObjCObjectProtocols(
3846 castExpr->getType(), CastClass)))
3847 // ok to cast an 'id' expression to a CFtype.
3848 // ok to cast an 'id<plist>' expression to CFtype provided plist
3849 // adopts all of CFtype's ObjetiveC's class plist.
3850 return true;
3851 else {
3852 if (warn) {
3853 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge_to_cf)
3854 << castExpr->getType() << castType;
3855 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3856 S.Diag(Target->getLocStart(), diag::note_declared_at);
3857 }
3858 return false;
3859 }
3860 }
3861 }
3862 S.Diag(castExpr->getLocStart(), diag::err_objc_ns_bridged_invalid_cfobject)
3863 << castExpr->getType() << castType;
3864 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3865 if (Target)
3866 S.Diag(Target->getLocStart(), diag::note_declared_at);
3867 return true;
3868 }
3869 return false;
3870 }
3871 T = TDNDecl->getUnderlyingType();
3872 }
3873 return true;
3874}
3875
3876void Sema::CheckTollFreeBridgeCast(QualType castType, Expr *castExpr) {
3877 if (!getLangOpts().ObjC1)
3878 return;
3879 // warn in presence of __bridge casting to or from a toll free bridge cast.
3880 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExpr->getType());
3881 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType);
3882 if (castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) {
3883 bool HasObjCBridgeAttr;
3884 bool ObjCBridgeAttrWillNotWarn =
3885 CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3886 false);
3887 if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
3888 return;
3889 bool HasObjCBridgeMutableAttr;
3890 bool ObjCBridgeMutableAttrWillNotWarn =
3891 CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3892 HasObjCBridgeMutableAttr, false);
3893 if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
3894 return;
3895
3896 if (HasObjCBridgeAttr)
3897 CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3898 true);
3899 else if (HasObjCBridgeMutableAttr)
3900 CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3901 HasObjCBridgeMutableAttr, true);
3902 }
3903 else if (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable) {
3904 bool HasObjCBridgeAttr;
3905 bool ObjCBridgeAttrWillNotWarn =
3906 CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3907 false);
3908 if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
3909 return;
3910 bool HasObjCBridgeMutableAttr;
3911 bool ObjCBridgeMutableAttrWillNotWarn =
3912 CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3913 HasObjCBridgeMutableAttr, false);
3914 if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
3915 return;
3916
3917 if (HasObjCBridgeAttr)
3918 CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3919 true);
3920 else if (HasObjCBridgeMutableAttr)
3921 CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3922 HasObjCBridgeMutableAttr, true);
3923 }
3924}
3925
3926void Sema::CheckObjCBridgeRelatedCast(QualType castType, Expr *castExpr) {
3927 QualType SrcType = castExpr->getType();
3928 if (ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(castExpr)) {
3929 if (PRE->isExplicitProperty()) {
3930 if (ObjCPropertyDecl *PDecl = PRE->getExplicitProperty())
3931 SrcType = PDecl->getType();
3932 }
3933 else if (PRE->isImplicitProperty()) {
3934 if (ObjCMethodDecl *Getter = PRE->getImplicitPropertyGetter())
3935 SrcType = Getter->getReturnType();
3936 }
3937 }
3938
3939 ARCConversionTypeClass srcExprACTC = classifyTypeForARCConversion(SrcType);
3940 ARCConversionTypeClass castExprACTC = classifyTypeForARCConversion(castType);
3941 if (srcExprACTC != ACTC_retainable || castExprACTC != ACTC_coreFoundation)
3942 return;
3943 CheckObjCBridgeRelatedConversions(castExpr->getLocStart(),
3944 castType, SrcType, castExpr);
3945}
3946
3947bool Sema::CheckTollFreeBridgeStaticCast(QualType castType, Expr *castExpr,
3948 CastKind &Kind) {
3949 if (!getLangOpts().ObjC1)
3950 return false;
3951 ARCConversionTypeClass exprACTC =
3952 classifyTypeForARCConversion(castExpr->getType());
3953 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType);
3954 if ((castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) ||
3955 (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable)) {
3956 CheckTollFreeBridgeCast(castType, castExpr);
3957 Kind = (castACTC == ACTC_coreFoundation) ? CK_BitCast
3958 : CK_CPointerToObjCPointerCast;
3959 return true;
3960 }
3961 return false;
3962}
3963
3964bool Sema::checkObjCBridgeRelatedComponents(SourceLocation Loc,
3965 QualType DestType, QualType SrcType,
3966 ObjCInterfaceDecl *&RelatedClass,
3967 ObjCMethodDecl *&ClassMethod,
3968 ObjCMethodDecl *&InstanceMethod,
3969 TypedefNameDecl *&TDNDecl,
3970 bool CfToNs, bool Diagnose) {
3971 QualType T = CfToNs ? SrcType : DestType;
3972 ObjCBridgeRelatedAttr *ObjCBAttr = ObjCBridgeRelatedAttrFromType(T, TDNDecl);
3973 if (!ObjCBAttr)
3974 return false;
3975
3976 IdentifierInfo *RCId = ObjCBAttr->getRelatedClass();
3977 IdentifierInfo *CMId = ObjCBAttr->getClassMethod();
3978 IdentifierInfo *IMId = ObjCBAttr->getInstanceMethod();
3979 if (!RCId)
3980 return false;
3981 NamedDecl *Target = nullptr;
3982 // Check for an existing type with this name.
3983 LookupResult R(*this, DeclarationName(RCId), SourceLocation(),
3984 Sema::LookupOrdinaryName);
3985 if (!LookupName(R, TUScope)) {
3986 if (Diagnose) {
3987 Diag(Loc, diag::err_objc_bridged_related_invalid_class) << RCId
3988 << SrcType << DestType;
3989 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3990 }
3991 return false;
3992 }
3993 Target = R.getFoundDecl();
3994 if (Target && isa<ObjCInterfaceDecl>(Target))
3995 RelatedClass = cast<ObjCInterfaceDecl>(Target);
3996 else {
3997 if (Diagnose) {
3998 Diag(Loc, diag::err_objc_bridged_related_invalid_class_name) << RCId
3999 << SrcType << DestType;
4000 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
4001 if (Target)
4002 Diag(Target->getLocStart(), diag::note_declared_at);
4003 }
4004 return false;
4005 }
4006
4007 // Check for an existing class method with the given selector name.
4008 if (CfToNs && CMId) {
4009 Selector Sel = Context.Selectors.getUnarySelector(CMId);
4010 ClassMethod = RelatedClass->lookupMethod(Sel, false);
4011 if (!ClassMethod) {
4012 if (Diagnose) {
4013 Diag(Loc, diag::err_objc_bridged_related_known_method)
4014 << SrcType << DestType << Sel << false;
4015 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
4016 }
4017 return false;
4018 }
4019 }
4020
4021 // Check for an existing instance method with the given selector name.
4022 if (!CfToNs && IMId) {
4023 Selector Sel = Context.Selectors.getNullarySelector(IMId);
4024 InstanceMethod = RelatedClass->lookupMethod(Sel, true);
4025 if (!InstanceMethod) {
4026 if (Diagnose) {
4027 Diag(Loc, diag::err_objc_bridged_related_known_method)
4028 << SrcType << DestType << Sel << true;
4029 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
4030 }
4031 return false;
4032 }
4033 }
4034 return true;
4035}
4036
4037bool
4038Sema::CheckObjCBridgeRelatedConversions(SourceLocation Loc,
4039 QualType DestType, QualType SrcType,
4040 Expr *&SrcExpr, bool Diagnose) {
4041 ARCConversionTypeClass rhsExprACTC = classifyTypeForARCConversion(SrcType);
4042 ARCConversionTypeClass lhsExprACTC = classifyTypeForARCConversion(DestType);
4043 bool CfToNs = (rhsExprACTC == ACTC_coreFoundation && lhsExprACTC == ACTC_retainable);
4044 bool NsToCf = (rhsExprACTC == ACTC_retainable && lhsExprACTC == ACTC_coreFoundation);
4045 if (!CfToNs && !NsToCf)
4046 return false;
4047
4048 ObjCInterfaceDecl *RelatedClass;
4049 ObjCMethodDecl *ClassMethod = nullptr;
4050 ObjCMethodDecl *InstanceMethod = nullptr;
4051 TypedefNameDecl *TDNDecl = nullptr;
4052 if (!checkObjCBridgeRelatedComponents(Loc, DestType, SrcType, RelatedClass,
4053 ClassMethod, InstanceMethod, TDNDecl,
4054 CfToNs, Diagnose))
4055 return false;
4056
4057 if (CfToNs) {
4058 // Implicit conversion from CF to ObjC object is needed.
4059 if (ClassMethod) {
4060 if (Diagnose) {
4061 std::string ExpressionString = "[";
4062 ExpressionString += RelatedClass->getNameAsString();
4063 ExpressionString += " ";
4064 ExpressionString += ClassMethod->getSelector().getAsString();
4065 SourceLocation SrcExprEndLoc = getLocForEndOfToken(SrcExpr->getLocEnd());
4066 // Provide a fixit: [RelatedClass ClassMethod SrcExpr]
4067 Diag(Loc, diag::err_objc_bridged_related_known_method)
4068 << SrcType << DestType << ClassMethod->getSelector() << false
4069 << FixItHint::CreateInsertion(SrcExpr->getLocStart(), ExpressionString)
4070 << FixItHint::CreateInsertion(SrcExprEndLoc, "]");
4071 Diag(RelatedClass->getLocStart(), diag::note_declared_at);
4072 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
4073
4074 QualType receiverType = Context.getObjCInterfaceType(RelatedClass);
4075 // Argument.
4076 Expr *args[] = { SrcExpr };
4077 ExprResult msg = BuildClassMessageImplicit(receiverType, false,
4078 ClassMethod->getLocation(),
4079 ClassMethod->getSelector(), ClassMethod,
4080 MultiExprArg(args, 1));
4081 SrcExpr = msg.get();
4082 }
4083 return true;
4084 }
4085 }
4086 else {
4087 // Implicit conversion from ObjC type to CF object is needed.
4088 if (InstanceMethod) {
4089 if (Diagnose) {
4090 std::string ExpressionString;
4091 SourceLocation SrcExprEndLoc =
4092 getLocForEndOfToken(SrcExpr->getLocEnd());
4093 if (InstanceMethod->isPropertyAccessor())
4094 if (const ObjCPropertyDecl *PDecl =
4095 InstanceMethod->findPropertyDecl()) {
4096 // fixit: ObjectExpr.propertyname when it is aproperty accessor.
4097 ExpressionString = ".";
4098 ExpressionString += PDecl->getNameAsString();
4099 Diag(Loc, diag::err_objc_bridged_related_known_method)
4100 << SrcType << DestType << InstanceMethod->getSelector() << true
4101 << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
4102 }
4103 if (ExpressionString.empty()) {
4104 // Provide a fixit: [ObjectExpr InstanceMethod]
4105 ExpressionString = " ";
4106 ExpressionString += InstanceMethod->getSelector().getAsString();
4107 ExpressionString += "]";
4108
4109 Diag(Loc, diag::err_objc_bridged_related_known_method)
4110 << SrcType << DestType << InstanceMethod->getSelector() << true
4111 << FixItHint::CreateInsertion(SrcExpr->getLocStart(), "[")
4112 << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
4113 }
4114 Diag(RelatedClass->getLocStart(), diag::note_declared_at);
4115 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
4116
4117 ExprResult msg =
4118 BuildInstanceMessageImplicit(SrcExpr, SrcType,
4119 InstanceMethod->getLocation(),
4120 InstanceMethod->getSelector(),
4121 InstanceMethod, None);
4122 SrcExpr = msg.get();
4123 }
4124 return true;
4125 }
4126 }
4127 return false;
4128}
4129
4130Sema::ARCConversionResult
4131Sema::CheckObjCConversion(SourceRange castRange, QualType castType,
4132 Expr *&castExpr, CheckedConversionKind CCK,
4133 bool Diagnose, bool DiagnoseCFAudited,
4134 BinaryOperatorKind Opc) {
4135 QualType castExprType = castExpr->getType();
4136
4137 // For the purposes of the classification, we assume reference types
4138 // will bind to temporaries.
4139 QualType effCastType = castType;
4140 if (const ReferenceType *ref = castType->getAs<ReferenceType>())
4141 effCastType = ref->getPointeeType();
4142
4143 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExprType);
4144 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(effCastType);
4145 if (exprACTC == castACTC) {
4146 // Check for viability and report error if casting an rvalue to a
4147 // life-time qualifier.
4148 if (castACTC == ACTC_retainable &&
4149 (CCK == CCK_CStyleCast || CCK == CCK_OtherCast) &&
4150 castType != castExprType) {
4151 const Type *DT = castType.getTypePtr();
4152 QualType QDT = castType;
4153 // We desugar some types but not others. We ignore those
4154 // that cannot happen in a cast; i.e. auto, and those which
4155 // should not be de-sugared; i.e typedef.
4156 if (const ParenType *PT = dyn_cast<ParenType>(DT))
4157 QDT = PT->desugar();
4158 else if (const TypeOfType *TP = dyn_cast<TypeOfType>(DT))
4159 QDT = TP->desugar();
4160 else if (const AttributedType *AT = dyn_cast<AttributedType>(DT))
4161 QDT = AT->desugar();
4162 if (QDT != castType &&
4163 QDT.getObjCLifetime() != Qualifiers::OCL_None) {
4164 if (Diagnose) {
4165 SourceLocation loc = (castRange.isValid() ? castRange.getBegin()
4166 : castExpr->getExprLoc());
4167 Diag(loc, diag::err_arc_nolifetime_behavior);
4168 }
4169 return ACR_error;
4170 }
4171 }
4172 return ACR_okay;
4173 }
4174
4175 // The life-time qualifier cast check above is all we need for ObjCWeak.
4176 // ObjCAutoRefCount has more restrictions on what is legal.
4177 if (!getLangOpts().ObjCAutoRefCount)
4178 return ACR_okay;
4179
4180 if (isAnyCLike(exprACTC) && isAnyCLike(castACTC)) return ACR_okay;
4181
4182 // Allow all of these types to be cast to integer types (but not
4183 // vice-versa).
4184 if (castACTC == ACTC_none && castType->isIntegralType(Context))
4185 return ACR_okay;
4186
4187 // Allow casts between pointers to lifetime types (e.g., __strong id*)
4188 // and pointers to void (e.g., cv void *). Casting from void* to lifetime*
4189 // must be explicit.
4190 if (exprACTC == ACTC_indirectRetainable && castACTC == ACTC_voidPtr)
4191 return ACR_okay;
4192 if (castACTC == ACTC_indirectRetainable && exprACTC == ACTC_voidPtr &&
4193 isCast(CCK))
4194 return ACR_okay;
4195
4196 switch (ARCCastChecker(Context, exprACTC, castACTC, false).Visit(castExpr)) {
4197 // For invalid casts, fall through.
4198 case ACC_invalid:
4199 break;
4200
4201 // Do nothing for both bottom and +0.
4202 case ACC_bottom:
4203 case ACC_plusZero:
4204 return ACR_okay;
4205
4206 // If the result is +1, consume it here.
4207 case ACC_plusOne:
4208 castExpr = ImplicitCastExpr::Create(Context, castExpr->getType(),
4209 CK_ARCConsumeObject, castExpr,
4210 nullptr, VK_RValue);
4211 Cleanup.setExprNeedsCleanups(true);
4212 return ACR_okay;
4213 }
4214
4215 // If this is a non-implicit cast from id or block type to a
4216 // CoreFoundation type, delay complaining in case the cast is used
4217 // in an acceptable context.
4218 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC) && isCast(CCK))
4219 return ACR_unbridged;
4220
4221 // Issue a diagnostic about a missing @-sign when implicit casting a cstring
4222 // to 'NSString *', instead of falling through to report a "bridge cast"
4223 // diagnostic.
4224 if (castACTC == ACTC_retainable && exprACTC == ACTC_none &&
4225 ConversionToObjCStringLiteralCheck(castType, castExpr, Diagnose))
4226 return ACR_error;
4227
4228 // Do not issue "bridge cast" diagnostic when implicit casting
4229 // a retainable object to a CF type parameter belonging to an audited
4230 // CF API function. Let caller issue a normal type mismatched diagnostic
4231 // instead.
4232 if ((!DiagnoseCFAudited || exprACTC != ACTC_retainable ||
4233 castACTC != ACTC_coreFoundation) &&
4234 !(exprACTC == ACTC_voidPtr && castACTC == ACTC_retainable &&
4235 (Opc == BO_NE || Opc == BO_EQ))) {
4236 if (Diagnose)
4237 diagnoseObjCARCConversion(*this, castRange, castType, castACTC, castExpr,
4238 castExpr, exprACTC, CCK);
4239 return ACR_error;
4240 }
4241 return ACR_okay;
4242}
4243
4244/// Given that we saw an expression with the ARCUnbridgedCastTy
4245/// placeholder type, complain bitterly.
4246void Sema::diagnoseARCUnbridgedCast(Expr *e) {
4247 // We expect the spurious ImplicitCastExpr to already have been stripped.
4248 assert(!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast))(static_cast <bool> (!e->hasPlaceholderType(BuiltinType
::ARCUnbridgedCast)) ? void (0) : __assert_fail ("!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast)"
, "/build/llvm-toolchain-snapshot-7~svn337490/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4248, __extension__ __PRETTY_FUNCTION__))
;
4249 CastExpr *realCast = cast<CastExpr>(e->IgnoreParens());
4250
4251 SourceRange castRange;
4252 QualType castType;
4253 CheckedConversionKind CCK;
4254
4255 if (CStyleCastExpr *cast = dyn_cast<CStyleCastExpr>(realCast)) {
4256 castRange = SourceRange(cast->getLParenLoc(), cast->getRParenLoc());
4257 castType = cast->getTypeAsWritten();
4258 CCK = CCK_CStyleCast;
4259 } else if (ExplicitCastExpr *cast = dyn_cast<ExplicitCastExpr>(realCast)) {
4260 castRange = cast->getTypeInfoAsWritten()->getTypeLoc().getSourceRange();
4261 castType = cast->getTypeAsWritten();
4262 CCK = CCK_OtherCast;
4263 } else {
4264 llvm_unreachable("Unexpected ImplicitCastExpr")::llvm::llvm_unreachable_internal("Unexpected ImplicitCastExpr"
, "/build/llvm-toolchain-snapshot-7~svn337490/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4264)
;
4265 }
4266
4267 ARCConversionTypeClass castACTC =
4268 classifyTypeForARCConversion(castType.getNonReferenceType());
4269
4270 Expr *castExpr = realCast->getSubExpr();
4271 assert(classifyTypeForARCConversion(castExpr->getType()) == ACTC_retainable)(static_cast <bool> (classifyTypeForARCConversion(castExpr
->getType()) == ACTC_retainable) ? void (0) : __assert_fail
("classifyTypeForARCConversion(castExpr->getType()) == ACTC_retainable"
, "/build/llvm-toolchain-snapshot-7~svn337490/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4271, __extension__ __PRETTY_FUNCTION__))
;
4272
4273 diagnoseObjCARCConversion(*this, castRange, castType, castACTC,
4274 castExpr, realCast, ACTC_retainable, CCK);
4275}
4276
4277/// stripARCUnbridgedCast - Given an expression of ARCUnbridgedCast
4278/// type, remove the placeholder cast.
4279Expr *Sema::stripARCUnbridgedCast(Expr *e) {
4280 assert(e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast))(static_cast <bool> (e->hasPlaceholderType(BuiltinType
::ARCUnbridgedCast)) ? void (0) : __assert_fail ("e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast)"
, "/build/llvm-toolchain-snapshot-7~svn337490/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4280, __extension__ __PRETTY_FUNCTION__))
;
4281
4282 if (ParenExpr *pe = dyn_cast<ParenExpr>(e)) {
4283 Expr *sub = stripARCUnbridgedCast(pe->getSubExpr());
4284 return new (Context) ParenExpr(pe->getLParen(), pe->getRParen(), sub);
4285 } else if (UnaryOperator *uo = dyn_cast<UnaryOperator>(e)) {
4286 assert(uo->getOpcode() == UO_Extension)(static_cast <bool> (uo->getOpcode() == UO_Extension
) ? void (0) : __assert_fail ("uo->getOpcode() == UO_Extension"
, "/build/llvm-toolchain-snapshot-7~svn337490/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4286, __extension__ __PRETTY_FUNCTION__))
;
4287 Expr *sub = stripARCUnbridgedCast(uo->getSubExpr());
4288 return new (Context)
4289 UnaryOperator(sub, UO_Extension, sub->getType(), sub->getValueKind(),
4290 sub->getObjectKind(), uo->getOperatorLoc(), false);
4291 } else if (GenericSelectionExpr *gse = dyn_cast<GenericSelectionExpr>(e)) {
4292 assert(!gse->isResultDependent())(static_cast <bool> (!gse->isResultDependent()) ? void
(0) : __assert_fail ("!gse->isResultDependent()", "/build/llvm-toolchain-snapshot-7~svn337490/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4292, __extension__ __PRETTY_FUNCTION__))
;
4293
4294 unsigned n = gse->getNumAssocs();
4295 SmallVector<Expr*, 4> subExprs(n);
4296 SmallVector<TypeSourceInfo*, 4> subTypes(n);
4297 for (unsigned i = 0; i != n; ++i) {
4298 subTypes[i] = gse->getAssocTypeSourceInfo(i);
4299 Expr *sub = gse->getAssocExpr(i);
4300 if (i == gse->getResultIndex())
4301 sub = stripARCUnbridgedCast(sub);
4302 subExprs[i] = sub;
4303 }
4304
4305 return new (Context) GenericSelectionExpr(Context, gse->getGenericLoc(),
4306 gse->getControllingExpr(),
4307 subTypes, subExprs,
4308 gse->getDefaultLoc(),
4309 gse->getRParenLoc(),
4310 gse->containsUnexpandedParameterPack(),
4311 gse->getResultIndex());
4312 } else {
4313 assert(isa<ImplicitCastExpr>(e) && "bad form of unbridged cast!")(static_cast <bool> (isa<ImplicitCastExpr>(e) &&
"bad form of unbridged cast!") ? void (0) : __assert_fail ("isa<ImplicitCastExpr>(e) && \"bad form of unbridged cast!\""
, "/build/llvm-toolchain-snapshot-7~svn337490/tools/clang/lib/Sema/SemaExprObjC.cpp"
, 4313, __extension__ __PRETTY_FUNCTION__))
;
4314 return cast<ImplicitCastExpr>(e)->getSubExpr();
4315 }
4316}
4317
4318bool Sema::CheckObjCARCUnavailableWeakConversion(QualType castType,
4319 QualType exprType) {
4320 QualType canCastType =
4321 Context.getCanonicalType(castType).getUnqualifiedType();
4322 QualType canExprType =
4323 Context.getCanonicalType(exprType).getUnqualifiedType();
4324 if (isa<ObjCObjectPointerType>(canCastType) &&
4325 castType.getObjCLifetime() == Qualifiers::OCL_Weak &&
4326 canExprType->isObjCObjectPointerType()) {
4327 if (const ObjCObjectPointerType *ObjT =
4328 canExprType->getAs<ObjCObjectPointerType>())
4329 if (const ObjCInterfaceDecl *ObjI = ObjT->getInterfaceDecl())
4330 return !ObjI->isArcWeakrefUnavailable();
4331 }
4332 return true;
4333}
4334
4335/// Look for an ObjCReclaimReturnedObject cast and destroy it.
4336static Expr *maybeUndoReclaimObject(Expr *e) {
4337 Expr *curExpr = e, *prevExpr = nullptr;
4338
4339 // Walk down the expression until we hit an implicit cast of kind
4340 // ARCReclaimReturnedObject or an Expr that is neither a Paren nor a Cast.
4341 while (true) {
4342 if (auto *pe = dyn_cast<ParenExpr>(curExpr)) {
4343 prevExpr = curExpr;
4344 curExpr = pe->getSubExpr();
4345 continue;
4346 }
4347
4348 if (auto *ce = dyn_cast<CastExpr>(curExpr)) {
4349 if (auto *ice = dyn_cast<ImplicitCastExpr>(ce))
4350 if (ice->getCastKind() == CK_ARCReclaimReturnedObject) {
4351 if (!prevExpr)
4352 return ice->getSubExpr();
4353 if (auto *pe = dyn_cast<ParenExpr>(prevExpr))
4354 pe->setSubExpr(ice->getSubExpr());
4355 else
4356 cast<CastExpr>(prevExpr)->setSubExpr(ice->getSubExpr());
4357 return e;
4358 }
4359
4360 prevExpr = curExpr;
4361 curExpr = ce->getSubExpr();
4362 continue;
4363 }
4364
4365 // Break out of the loop if curExpr is neither a Paren nor a Cast.
4366 break;
4367 }
4368
4369 return e;
4370}
4371
4372ExprResult Sema::BuildObjCBridgedCast(SourceLocation LParenLoc,
4373 ObjCBridgeCastKind Kind,
4374 SourceLocation BridgeKeywordLoc,
4375 TypeSourceInfo *TSInfo,
4376 Expr *SubExpr) {
4377 ExprResult SubResult = UsualUnaryConversions(SubExpr);
4378 if (SubResult.isInvalid()) return ExprError();
4379 SubExpr = SubResult.get();
4380
4381 QualType T = TSInfo->getType();
4382 QualType FromType = SubExpr->getType();
4383
4384 CastKind CK;
4385
4386 bool MustConsume = false;
4387 if (T->isDependentType() || SubExpr->isTypeDependent()) {
4388 // Okay: we'll build a dependent expression type.
4389 CK = CK_Dependent;
4390 } else if (T->isObjCARCBridgableType() && FromType->isCARCBridgableType()) {
4391 // Casting CF -> id
4392 CK = (T->isBlockPointerType() ? CK_AnyPointerToBlockPointerCast
4393 : CK_CPointerToObjCPointerCast);
4394 switch (Kind) {
4395 case OBC_Bridge:
4396 break;
4397
4398 case OBC_BridgeRetained: {
4399 bool br = isKnownName("CFBridgingRelease");
4400 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4401 << 2
4402 << FromType
4403 << (T->isBlockPointerType()? 1 : 0)
4404 << T
4405 << SubExpr->getSourceRange()
4406 << Kind;
4407 Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4408 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge");
4409 Diag(BridgeKeywordLoc, diag::note_arc_bridge_transfer)
4410 << FromType << br
4411 << FixItHint::CreateReplacement(BridgeKeywordLoc,
4412 br ? "CFBridgingRelease "
4413 : "__bridge_transfer ");
4414
4415 Kind = OBC_Bridge;
4416 break;
4417 }
4418
4419 case OBC_BridgeTransfer:
4420 // We must consume the Objective-C object produced by the cast.
4421 MustConsume = true;
4422 break;
4423 }
4424 } else if (T->isCARCBridgableType() && FromType->isObjCARCBridgableType()) {
4425 // Okay: id -> CF
4426 CK = CK_BitCast;
4427 switch (Kind) {
4428 case OBC_Bridge:
4429 // Reclaiming a value that's going to be __bridge-casted to CF
4430 // is very dangerous, so we don't do it.
4431 SubExpr = maybeUndoReclaimObject(SubExpr);
4432 break;
4433
4434 case OBC_BridgeRetained:
4435 // Produce the object before casting it.
4436 SubExpr = ImplicitCastExpr::Create(Context, FromType,
4437 CK_ARCProduceObject,
4438 SubExpr, nullptr, VK_RValue);
4439 break;
4440
4441 case OBC_BridgeTransfer: {
4442 bool br = isKnownName("CFBridgingRetain");
4443 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4444 << (FromType->isBlockPointerType()? 1 : 0)
4445 << FromType
4446 << 2
4447 << T
4448 << SubExpr->getSourceRange()
4449 << Kind;
4450
4451 Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4452 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge ");
4453 Diag(BridgeKeywordLoc, diag::note_arc_bridge_retained)
4454 << T << br
4455 << FixItHint::CreateReplacement(BridgeKeywordLoc,
4456 br ? "CFBridgingRetain " : "__bridge_retained");
4457
4458 Kind = OBC_Bridge;
4459 break;
4460 }
4461 }
4462 } else {
4463 Diag(LParenLoc, diag::err_arc_bridge_cast_incompatible)
4464 << FromType << T << Kind
4465 << SubExpr->getSourceRange()
4466 << TSInfo->getTypeLoc().getSourceRange();
4467 return ExprError();
4468 }
4469
4470 Expr *Result = new (Context) ObjCBridgedCastExpr(LParenLoc, Kind, CK,
4471 BridgeKeywordLoc,
4472 TSInfo, SubExpr);
4473
4474 if (MustConsume) {
4475 Cleanup.setExprNeedsCleanups(true);
4476 Result = ImplicitCastExpr::Create(Context, T, CK_ARCConsumeObject, Result,
4477 nullptr, VK_RValue);
4478 }
4479
4480 return Result;
4481}
4482
4483ExprResult Sema::ActOnObjCBridgedCast(Scope *S,
4484 SourceLocation LParenLoc,
4485 ObjCBridgeCastKind Kind,
4486 SourceLocation BridgeKeywordLoc,
4487 ParsedType Type,
4488 SourceLocation RParenLoc,
4489 Expr *SubExpr) {
4490 TypeSourceInfo *TSInfo = nullptr;
4491 QualType T = GetTypeFromParser(Type, &TSInfo);
4492 if (Kind == OBC_Bridge)
4493 CheckTollFreeBridgeCast(T, SubExpr);
4494 if (!TSInfo)
4495 TSInfo = Context.getTrivialTypeSourceInfo(T, LParenLoc);
4496 return BuildObjCBridgedCast(LParenLoc, Kind, BridgeKeywordLoc, TSInfo,
4497 SubExpr);
4498}